Add linux-next specific files for 20110831

[linux-2.6/next.git] / drivers / gpu / drm / nouveau / nouveau_bios.c

/*
 * Copyright 2005-2006 Erik Waling
 * Copyright 2006 Stephane Marchesin
 * Copyright 2007-2009 Stuart Bennett
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "drmP.h"
#define NV_DEBUG_NOTRACE
#include "nouveau_drv.h"
#include "nouveau_hw.h"
#include "nouveau_encoder.h"

#include <linux/io-mapping.h>

/* these defines are made up */
#define NV_CIO_CRE_44_HEADA 0x0
#define NV_CIO_CRE_44_HEADB 0x3
#define FEATURE_MOBILE 0x10     /* also FEATURE_QUADRO for BMP */
#define LEGACY_I2C_CRT 0x80
#define LEGACY_I2C_PANEL 0x81
#define LEGACY_I2C_TV 0x82

#define EDID1_LEN 128

#define BIOSLOG(sip, fmt, arg...) NV_DEBUG(sip->dev, fmt, ##arg)
#define LOG_OLD_VALUE(x)

struct init_exec {
        bool execute;
        bool repeat;
};

static bool nv_cksum(const uint8_t *data, unsigned int length)
{
        /*
         * There's a few checksums in the BIOS, so here's a generic checking
         * function.
         */
        int i;
        uint8_t sum = 0;

        for (i = 0; i < length; i++)
                sum += data[i];

        if (sum)
                return true;

        return false;
}

static int
score_vbios(struct drm_device *dev, const uint8_t *data, const bool writeable)
{
        if (!(data[0] == 0x55 && data[1] == 0xAA)) {
                NV_TRACEWARN(dev, "... BIOS signature not found\n");
                return 0;
        }

        if (nv_cksum(data, data[2] * 512)) {
                NV_TRACEWARN(dev, "... BIOS checksum invalid\n");
                /* if a ro image is somewhat bad, it's probably all rubbish */
                return writeable ? 2 : 1;
        } else
                NV_TRACE(dev, "... appears to be valid\n");

        return 3;
}

static void load_vbios_prom(struct drm_device *dev, uint8_t *data)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        uint32_t pci_nv_20, save_pci_nv_20;
        int pcir_ptr;
        int i;

        if (dev_priv->card_type >= NV_50)
                pci_nv_20 = 0x88050;
        else
                pci_nv_20 = NV_PBUS_PCI_NV_20;

        /* enable ROM access */
        save_pci_nv_20 = nvReadMC(dev, pci_nv_20);
        nvWriteMC(dev, pci_nv_20,
                  save_pci_nv_20 & ~NV_PBUS_PCI_NV_20_ROM_SHADOW_ENABLED);

        /* bail if no rom signature */
        if (nv_rd08(dev, NV_PROM_OFFSET) != 0x55 ||
            nv_rd08(dev, NV_PROM_OFFSET + 1) != 0xaa)
                goto out;

        /* additional check (see note below) - read PCI record header */
        pcir_ptr = nv_rd08(dev, NV_PROM_OFFSET + 0x18) |
                   nv_rd08(dev, NV_PROM_OFFSET + 0x19) << 8;
        if (nv_rd08(dev, NV_PROM_OFFSET + pcir_ptr) != 'P' ||
            nv_rd08(dev, NV_PROM_OFFSET + pcir_ptr + 1) != 'C' ||
            nv_rd08(dev, NV_PROM_OFFSET + pcir_ptr + 2) != 'I' ||
            nv_rd08(dev, NV_PROM_OFFSET + pcir_ptr + 3) != 'R')
                goto out;

        /* on some 6600GT/6800LE prom reads are messed up.  nvclock alleges a
         * a good read may be obtained by waiting or re-reading (cargocult: 5x)
         * each byte.  we'll hope pramin has something usable instead
         */
        for (i = 0; i < NV_PROM_SIZE; i++)
                data[i] = nv_rd08(dev, NV_PROM_OFFSET + i);

out:
        /* disable ROM access */
        nvWriteMC(dev, pci_nv_20,
                  save_pci_nv_20 | NV_PBUS_PCI_NV_20_ROM_SHADOW_ENABLED);
}

static void load_vbios_pramin(struct drm_device *dev, uint8_t *data)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        uint32_t old_bar0_pramin = 0;
        int i;

        if (dev_priv->card_type >= NV_50) {
                u64 addr = (u64)(nv_rd32(dev, 0x619f04) & 0xffffff00) << 8;
                if (!addr) {
                        addr  = (u64)nv_rd32(dev, 0x1700) << 16;
                        addr += 0xf0000;
                }

                old_bar0_pramin = nv_rd32(dev, 0x1700);
                nv_wr32(dev, 0x1700, addr >> 16);
        }

        /* bail if no rom signature */
        if (nv_rd08(dev, NV_PRAMIN_OFFSET) != 0x55 ||
            nv_rd08(dev, NV_PRAMIN_OFFSET + 1) != 0xaa)
                goto out;

        for (i = 0; i < NV_PROM_SIZE; i++)
                data[i] = nv_rd08(dev, NV_PRAMIN_OFFSET + i);

out:
        if (dev_priv->card_type >= NV_50)
                nv_wr32(dev, 0x1700, old_bar0_pramin);
}

static void load_vbios_pci(struct drm_device *dev, uint8_t *data)
{
        void __iomem *rom = NULL;
        size_t rom_len;
        int ret;

        ret = pci_enable_rom(dev->pdev);
        if (ret)
                return;

        rom = pci_map_rom(dev->pdev, &rom_len);
        if (!rom)
                goto out;
        memcpy_fromio(data, rom, rom_len);
        pci_unmap_rom(dev->pdev, rom);

out:
        pci_disable_rom(dev->pdev);
}

static void load_vbios_acpi(struct drm_device *dev, uint8_t *data)
{
        int i;
        int ret;
        int size = 64 * 1024;

        if (!nouveau_acpi_rom_supported(dev->pdev))
                return;

        for (i = 0; i < (size / ROM_BIOS_PAGE); i++) {
                ret = nouveau_acpi_get_bios_chunk(data,
                                                  (i * ROM_BIOS_PAGE),
                                                  ROM_BIOS_PAGE);
                if (ret <= 0)
                        break;
        }
        return;
}

struct methods {
        const char desc[8];
        void (*loadbios)(struct drm_device *, uint8_t *);
        const bool rw;
};

static struct methods shadow_methods[] = {
        { "PRAMIN", load_vbios_pramin, true },
        { "PROM", load_vbios_prom, false },
        { "PCIROM", load_vbios_pci, true },
        { "ACPI", load_vbios_acpi, true },
};
#define NUM_SHADOW_METHODS ARRAY_SIZE(shadow_methods)

static bool NVShadowVBIOS(struct drm_device *dev, uint8_t *data)
{
        struct methods *methods = shadow_methods;
        int testscore = 3;
        int scores[NUM_SHADOW_METHODS], i;

        if (nouveau_vbios) {
                for (i = 0; i < NUM_SHADOW_METHODS; i++)
                        if (!strcasecmp(nouveau_vbios, methods[i].desc))
                                break;

                if (i < NUM_SHADOW_METHODS) {
                        NV_INFO(dev, "Attempting to use BIOS image from %s\n",
                                methods[i].desc);

                        methods[i].loadbios(dev, data);
                        if (score_vbios(dev, data, methods[i].rw))
                                return true;
                }

                NV_ERROR(dev, "VBIOS source \'%s\' invalid\n", nouveau_vbios);
        }

        for (i = 0; i < NUM_SHADOW_METHODS; i++) {
                NV_TRACE(dev, "Attempting to load BIOS image from %s\n",
                         methods[i].desc);
                data[0] = data[1] = 0;  /* avoid reuse of previous image */
                methods[i].loadbios(dev, data);
                scores[i] = score_vbios(dev, data, methods[i].rw);
                if (scores[i] == testscore)
                        return true;
        }

        while (--testscore > 0) {
                for (i = 0; i < NUM_SHADOW_METHODS; i++) {
                        if (scores[i] == testscore) {
                                NV_TRACE(dev, "Using BIOS image from %s\n",
                                         methods[i].desc);
                                methods[i].loadbios(dev, data);
                                return true;
                        }
                }
        }

        NV_ERROR(dev, "No valid BIOS image found\n");
        return false;
}

struct init_tbl_entry {
        char *name;
        uint8_t id;
        /* Return:
         *  > 0: success, length of opcode
         *    0: success, but abort further parsing of table (INIT_DONE etc)
         *  < 0: failure, table parsing will be aborted
         */
        int (*handler)(struct nvbios *, uint16_t, struct init_exec *);
};

static int parse_init_table(struct nvbios *, uint16_t, struct init_exec *);

#define MACRO_INDEX_SIZE        2
#define MACRO_SIZE              8
#define CONDITION_SIZE          12
#define IO_FLAG_CONDITION_SIZE  9
#define IO_CONDITION_SIZE       5
#define MEM_INIT_SIZE           66

static void still_alive(void)
{
#if 0
        sync();
        mdelay(2);
#endif
}

static uint32_t
munge_reg(struct nvbios *bios, uint32_t reg)
{
        struct drm_nouveau_private *dev_priv = bios->dev->dev_private;
        struct dcb_entry *dcbent = bios->display.output;

        if (dev_priv->card_type < NV_50)
                return reg;

        if (reg & 0x40000000) {
                BUG_ON(!dcbent);

                reg += (ffs(dcbent->or) - 1) * 0x800;
                if ((reg & 0x20000000) && !(dcbent->sorconf.link & 1))
                        reg += 0x00000080;
        }

        reg &= ~0x60000000;
        return reg;
}

static int
valid_reg(struct nvbios *bios, uint32_t reg)
{
        struct drm_nouveau_private *dev_priv = bios->dev->dev_private;
        struct drm_device *dev = bios->dev;

        /* C51 has misaligned regs on purpose. Marvellous */
        if (reg & 0x2 ||
            (reg & 0x1 && dev_priv->vbios.chip_version != 0x51))
                NV_ERROR(dev, "======= misaligned reg 0x%08X =======\n", reg);

        /* warn on C51 regs that haven't been verified accessible in tracing */
        if (reg & 0x1 && dev_priv->vbios.chip_version == 0x51 &&
            reg != 0x130d && reg != 0x1311 && reg != 0x60081d)
                NV_WARN(dev, "=== C51 misaligned reg 0x%08X not verified ===\n",
                        reg);

        if (reg >= (8*1024*1024)) {
                NV_ERROR(dev, "=== reg 0x%08x out of mapped bounds ===\n", reg);
                return 0;
        }

        return 1;
}

static bool
valid_idx_port(struct nvbios *bios, uint16_t port)
{
        struct drm_nouveau_private *dev_priv = bios->dev->dev_private;
        struct drm_device *dev = bios->dev;

        /*
         * If adding more ports here, the read/write functions below will need
         * updating so that the correct mmio range (PRMCIO, PRMDIO, PRMVIO) is
         * used for the port in question
         */
        if (dev_priv->card_type < NV_50) {
                if (port == NV_CIO_CRX__COLOR)
                        return true;
                if (port == NV_VIO_SRX)
                        return true;
        } else {
                if (port == NV_CIO_CRX__COLOR)
                        return true;
        }

        NV_ERROR(dev, "========== unknown indexed io port 0x%04X ==========\n",
                 port);

        return false;
}

static bool
valid_port(struct nvbios *bios, uint16_t port)
{
        struct drm_device *dev = bios->dev;

        /*
         * If adding more ports here, the read/write functions below will need
         * updating so that the correct mmio range (PRMCIO, PRMDIO, PRMVIO) is
         * used for the port in question
         */
        if (port == NV_VIO_VSE2)
                return true;

        NV_ERROR(dev, "========== unknown io port 0x%04X ==========\n", port);

        return false;
}

static uint32_t
bios_rd32(struct nvbios *bios, uint32_t reg)
{
        uint32_t data;

        reg = munge_reg(bios, reg);
        if (!valid_reg(bios, reg))
                return 0;

        /*
         * C51 sometimes uses regs with bit0 set in the address. For these
         * cases there should exist a translation in a BIOS table to an IO
         * port address which the BIOS uses for accessing the reg
         *
         * These only seem to appear for the power control regs to a flat panel,
         * and the GPIO regs at 0x60081*.  In C51 mmio traces the normal regs
         * for 0x1308 and 0x1310 are used - hence the mask below.  An S3
         * suspend-resume mmio trace from a C51 will be required to see if this
         * is true for the power microcode in 0x14.., or whether the direct IO
         * port access method is needed
         */
        if (reg & 0x1)
                reg &= ~0x1;

        data = nv_rd32(bios->dev, reg);

        BIOSLOG(bios, " Read:  Reg: 0x%08X, Data: 0x%08X\n", reg, data);

        return data;
}

static void
bios_wr32(struct nvbios *bios, uint32_t reg, uint32_t data)
{
        struct drm_nouveau_private *dev_priv = bios->dev->dev_private;

        reg = munge_reg(bios, reg);
        if (!valid_reg(bios, reg))
                return;

        /* see note in bios_rd32 */
        if (reg & 0x1)
                reg &= 0xfffffffe;

        LOG_OLD_VALUE(bios_rd32(bios, reg));
        BIOSLOG(bios, " Write: Reg: 0x%08X, Data: 0x%08X\n", reg, data);

        if (dev_priv->vbios.execute) {
                still_alive();
                nv_wr32(bios->dev, reg, data);
        }
}

static uint8_t
bios_idxprt_rd(struct nvbios *bios, uint16_t port, uint8_t index)
{
        struct drm_nouveau_private *dev_priv = bios->dev->dev_private;
        struct drm_device *dev = bios->dev;
        uint8_t data;

        if (!valid_idx_port(bios, port))
                return 0;

        if (dev_priv->card_type < NV_50) {
                if (port == NV_VIO_SRX)
                        data = NVReadVgaSeq(dev, bios->state.crtchead, index);
                else    /* assume NV_CIO_CRX__COLOR */
                        data = NVReadVgaCrtc(dev, bios->state.crtchead, index);
        } else {
                uint32_t data32;

                data32 = bios_rd32(bios, NV50_PDISPLAY_VGACRTC(index & ~3));
                data = (data32 >> ((index & 3) << 3)) & 0xff;
        }

        BIOSLOG(bios, " Indexed IO read:  Port: 0x%04X, Index: 0x%02X, "
                      "Head: 0x%02X, Data: 0x%02X\n",
                port, index, bios->state.crtchead, data);
        return data;
}

static void
bios_idxprt_wr(struct nvbios *bios, uint16_t port, uint8_t index, uint8_t data)
{
        struct drm_nouveau_private *dev_priv = bios->dev->dev_private;
        struct drm_device *dev = bios->dev;

        if (!valid_idx_port(bios, port))
                return;

        /*
         * The current head is maintained in the nvbios member  state.crtchead.
         * We trap changes to CR44 and update the head variable and hence the
         * register set written.
         * As CR44 only exists on CRTC0, we update crtchead to head0 in advance
         * of the write, and to head1 after the write
         */
        if (port == NV_CIO_CRX__COLOR && index == NV_CIO_CRE_44 &&
            data != NV_CIO_CRE_44_HEADB)
                bios->state.crtchead = 0;

        LOG_OLD_VALUE(bios_idxprt_rd(bios, port, index));
        BIOSLOG(bios, " Indexed IO write: Port: 0x%04X, Index: 0x%02X, "
                      "Head: 0x%02X, Data: 0x%02X\n",
                port, index, bios->state.crtchead, data);

        if (bios->execute && dev_priv->card_type < NV_50) {
                still_alive();
                if (port == NV_VIO_SRX)
                        NVWriteVgaSeq(dev, bios->state.crtchead, index, data);
                else    /* assume NV_CIO_CRX__COLOR */
                        NVWriteVgaCrtc(dev, bios->state.crtchead, index, data);
        } else
        if (bios->execute) {
                uint32_t data32, shift = (index & 3) << 3;

                still_alive();

                data32  = bios_rd32(bios, NV50_PDISPLAY_VGACRTC(index & ~3));
                data32 &= ~(0xff << shift);
                data32 |= (data << shift);
                bios_wr32(bios, NV50_PDISPLAY_VGACRTC(index & ~3), data32);
        }

        if (port == NV_CIO_CRX__COLOR &&
            index == NV_CIO_CRE_44 && data == NV_CIO_CRE_44_HEADB)
                bios->state.crtchead = 1;
}

static uint8_t
bios_port_rd(struct nvbios *bios, uint16_t port)
{
        uint8_t data, head = bios->state.crtchead;

        if (!valid_port(bios, port))
                return 0;

        data = NVReadPRMVIO(bios->dev, head, NV_PRMVIO0_OFFSET + port);

        BIOSLOG(bios, " IO read:  Port: 0x%04X, Head: 0x%02X, Data: 0x%02X\n",
                port, head, data);

        return data;
}

static void
bios_port_wr(struct nvbios *bios, uint16_t port, uint8_t data)
{
        int head = bios->state.crtchead;

        if (!valid_port(bios, port))
                return;

        LOG_OLD_VALUE(bios_port_rd(bios, port));
        BIOSLOG(bios, " IO write: Port: 0x%04X, Head: 0x%02X, Data: 0x%02X\n",
                port, head, data);

        if (!bios->execute)
                return;

        still_alive();
        NVWritePRMVIO(bios->dev, head, NV_PRMVIO0_OFFSET + port, data);
}

static bool
io_flag_condition_met(struct nvbios *bios, uint16_t offset, uint8_t cond)
{
        /*
         * The IO flag condition entry has 2 bytes for the CRTC port; 1 byte
         * for the CRTC index; 1 byte for the mask to apply to the value
         * retrieved from the CRTC; 1 byte for the shift right to apply to the
         * masked CRTC value; 2 bytes for the offset to the flag array, to
         * which the shifted value is added; 1 byte for the mask applied to the
         * value read from the flag array; and 1 byte for the value to compare
         * against the masked byte from the flag table.
         */

        uint16_t condptr = bios->io_flag_condition_tbl_ptr + cond * IO_FLAG_CONDITION_SIZE;
        uint16_t crtcport = ROM16(bios->data[condptr]);
        uint8_t crtcindex = bios->data[condptr + 2];
        uint8_t mask = bios->data[condptr + 3];
        uint8_t shift = bios->data[condptr + 4];
        uint16_t flagarray = ROM16(bios->data[condptr + 5]);
        uint8_t flagarraymask = bios->data[condptr + 7];
        uint8_t cmpval = bios->data[condptr + 8];
        uint8_t data;

        BIOSLOG(bios, "0x%04X: Port: 0x%04X, Index: 0x%02X, Mask: 0x%02X, "
                      "Shift: 0x%02X, FlagArray: 0x%04X, FAMask: 0x%02X, "
                      "Cmpval: 0x%02X\n",
                offset, crtcport, crtcindex, mask, shift, flagarray, flagarraymask, cmpval);

        data = bios_idxprt_rd(bios, crtcport, crtcindex);

        data = bios->data[flagarray + ((data & mask) >> shift)];
        data &= flagarraymask;

        BIOSLOG(bios, "0x%04X: Checking if 0x%02X equals 0x%02X\n",
                offset, data, cmpval);

        return (data == cmpval);
}

static bool
bios_condition_met(struct nvbios *bios, uint16_t offset, uint8_t cond)
{
        /*
         * The condition table entry has 4 bytes for the address of the
         * register to check, 4 bytes for a mask to apply to the register and
         * 4 for a test comparison value
         */

        uint16_t condptr = bios->condition_tbl_ptr + cond * CONDITION_SIZE;
        uint32_t reg = ROM32(bios->data[condptr]);
        uint32_t mask = ROM32(bios->data[condptr + 4]);
        uint32_t cmpval = ROM32(bios->data[condptr + 8]);
        uint32_t data;

        BIOSLOG(bios, "0x%04X: Cond: 0x%02X, Reg: 0x%08X, Mask: 0x%08X\n",
                offset, cond, reg, mask);

        data = bios_rd32(bios, reg) & mask;

        BIOSLOG(bios, "0x%04X: Checking if 0x%08X equals 0x%08X\n",
                offset, data, cmpval);

        return (data == cmpval);
}

static bool
io_condition_met(struct nvbios *bios, uint16_t offset, uint8_t cond)
{
        /*
         * The IO condition entry has 2 bytes for the IO port address; 1 byte
         * for the index to write to io_port; 1 byte for the mask to apply to
         * the byte read from io_port+1; and 1 byte for the value to compare
         * against the masked byte.
         */

        uint16_t condptr = bios->io_condition_tbl_ptr + cond * IO_CONDITION_SIZE;
        uint16_t io_port = ROM16(bios->data[condptr]);
        uint8_t port_index = bios->data[condptr + 2];
        uint8_t mask = bios->data[condptr + 3];
        uint8_t cmpval = bios->data[condptr + 4];

        uint8_t data = bios_idxprt_rd(bios, io_port, port_index) & mask;

        BIOSLOG(bios, "0x%04X: Checking if 0x%02X equals 0x%02X\n",
                offset, data, cmpval);

        return (data == cmpval);
}

static int
nv50_pll_set(struct drm_device *dev, uint32_t reg, uint32_t clk)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        uint32_t reg0 = nv_rd32(dev, reg + 0);
        uint32_t reg1 = nv_rd32(dev, reg + 4);
        struct nouveau_pll_vals pll;
        struct pll_lims pll_limits;
        int ret;

        ret = get_pll_limits(dev, reg, &pll_limits);
        if (ret)
                return ret;

        clk = nouveau_calc_pll_mnp(dev, &pll_limits, clk, &pll);
        if (!clk)
                return -ERANGE;

        reg0 = (reg0 & 0xfff8ffff) | (pll.log2P << 16);
        reg1 = (reg1 & 0xffff0000) | (pll.N1 << 8) | pll.M1;

        if (dev_priv->vbios.execute) {
                still_alive();
                nv_wr32(dev, reg + 4, reg1);
                nv_wr32(dev, reg + 0, reg0);
        }

        return 0;
}

static int
setPLL(struct nvbios *bios, uint32_t reg, uint32_t clk)
{
        struct drm_device *dev = bios->dev;
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        /* clk in kHz */
        struct pll_lims pll_lim;
        struct nouveau_pll_vals pllvals;
        int ret;

        if (dev_priv->card_type >= NV_50)
                return nv50_pll_set(dev, reg, clk);

        /* high regs (such as in the mac g5 table) are not -= 4 */
        ret = get_pll_limits(dev, reg > 0x405c ? reg : reg - 4, &pll_lim);
        if (ret)
                return ret;

        clk = nouveau_calc_pll_mnp(dev, &pll_lim, clk, &pllvals);
        if (!clk)
                return -ERANGE;

        if (bios->execute) {
                still_alive();
                nouveau_hw_setpll(dev, reg, &pllvals);
        }

        return 0;
}

static int dcb_entry_idx_from_crtchead(struct drm_device *dev)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;

        /*
         * For the results of this function to be correct, CR44 must have been
         * set (using bios_idxprt_wr to set crtchead), CR58 set for CR57 = 0,
         * and the DCB table parsed, before the script calling the function is
         * run.  run_digital_op_script is example of how to do such setup
         */

        uint8_t dcb_entry = NVReadVgaCrtc5758(dev, bios->state.crtchead, 0);

        if (dcb_entry > bios->dcb.entries) {
                NV_ERROR(dev, "CR58 doesn't have a valid DCB entry currently "
                                "(%02X)\n", dcb_entry);
                dcb_entry = 0x7f;       /* unused / invalid marker */
        }

        return dcb_entry;
}

static int
read_dcb_i2c_entry(struct drm_device *dev, int dcb_version, uint8_t *i2ctable, int index, struct dcb_i2c_entry *i2c)
{
        uint8_t dcb_i2c_ver = dcb_version, headerlen = 0, entry_len = 4;
        int i2c_entries = DCB_MAX_NUM_I2C_ENTRIES;
        int recordoffset = 0, rdofs = 1, wrofs = 0;
        uint8_t port_type = 0;

        if (!i2ctable)
                return -EINVAL;

        if (dcb_version >= 0x30) {
                if (i2ctable[0] != dcb_version) /* necessary? */
                        NV_WARN(dev,
                                "DCB I2C table version mismatch (%02X vs %02X)\n",
                                i2ctable[0], dcb_version);
                dcb_i2c_ver = i2ctable[0];
                headerlen = i2ctable[1];
                if (i2ctable[2] <= DCB_MAX_NUM_I2C_ENTRIES)
                        i2c_entries = i2ctable[2];
                else
                        NV_WARN(dev,
                                "DCB I2C table has more entries than indexable "
                                "(%d entries, max %d)\n", i2ctable[2],
                                DCB_MAX_NUM_I2C_ENTRIES);
                entry_len = i2ctable[3];
                /* [4] is i2c_default_indices, read in parse_dcb_table() */
        }
        /*
         * It's your own fault if you call this function on a DCB 1.1 BIOS --
         * the test below is for DCB 1.2
         */
        if (dcb_version < 0x14) {
                recordoffset = 2;
                rdofs = 0;
                wrofs = 1;
        }

        if (index == 0xf)
                return 0;
        if (index >= i2c_entries) {
                NV_ERROR(dev, "DCB I2C index too big (%d >= %d)\n",
                         index, i2ctable[2]);
                return -ENOENT;
        }
        if (i2ctable[headerlen + entry_len * index + 3] == 0xff) {
                NV_ERROR(dev, "DCB I2C entry invalid\n");
                return -EINVAL;
        }

        if (dcb_i2c_ver >= 0x30) {
                port_type = i2ctable[headerlen + recordoffset + 3 + entry_len * index];

                /*
                 * Fixup for chips using same address offset for read and
                 * write.
                 */
                if (port_type == 4)     /* seen on C51 */
                        rdofs = wrofs = 1;
                if (port_type >= 5)     /* G80+ */
                        rdofs = wrofs = 0;
        }

        if (dcb_i2c_ver >= 0x40) {
                if (port_type != 5 && port_type != 6)
                        NV_WARN(dev, "DCB I2C table has port type %d\n", port_type);

                i2c->entry = ROM32(i2ctable[headerlen + recordoffset + entry_len * index]);
        }

        i2c->port_type = port_type;
        i2c->read = i2ctable[headerlen + recordoffset + rdofs + entry_len * index];
        i2c->write = i2ctable[headerlen + recordoffset + wrofs + entry_len * index];

        return 0;
}

static struct nouveau_i2c_chan *
init_i2c_device_find(struct drm_device *dev, int i2c_index)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct dcb_table *dcb = &dev_priv->vbios.dcb;

        if (i2c_index == 0xff) {
                /* note: dcb_entry_idx_from_crtchead needs pre-script set-up */
                int idx = dcb_entry_idx_from_crtchead(dev), shift = 0;
                int default_indices = dcb->i2c_default_indices;

                if (idx != 0x7f && dcb->entry[idx].i2c_upper_default)
                        shift = 4;

                i2c_index = (default_indices >> shift) & 0xf;
        }
        if (i2c_index == 0x80)  /* g80+ */
                i2c_index = dcb->i2c_default_indices & 0xf;
        else
        if (i2c_index == 0x81)
                i2c_index = (dcb->i2c_default_indices & 0xf0) >> 4;

        if (i2c_index >= DCB_MAX_NUM_I2C_ENTRIES) {
                NV_ERROR(dev, "invalid i2c_index 0x%x\n", i2c_index);
                return NULL;
        }

        /* Make sure i2c table entry has been parsed, it may not
         * have been if this is a bus not referenced by a DCB encoder
         */
        read_dcb_i2c_entry(dev, dcb->version, dcb->i2c_table,
                           i2c_index, &dcb->i2c[i2c_index]);

        return nouveau_i2c_find(dev, i2c_index);
}

static uint32_t
get_tmds_index_reg(struct drm_device *dev, uint8_t mlv)
{
        /*
         * For mlv < 0x80, it is an index into a table of TMDS base addresses.
         * For mlv == 0x80 use the "or" value of the dcb_entry indexed by
         * CR58 for CR57 = 0 to index a table of offsets to the basic
         * 0x6808b0 address.
         * For mlv == 0x81 use the "or" value of the dcb_entry indexed by
         * CR58 for CR57 = 0 to index a table of offsets to the basic
         * 0x6808b0 address, and then flip the offset by 8.
         */

        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        const int pramdac_offset[13] = {
                0, 0, 0x8, 0, 0x2000, 0, 0, 0, 0x2008, 0, 0, 0, 0x2000 };
        const uint32_t pramdac_table[4] = {
                0x6808b0, 0x6808b8, 0x6828b0, 0x6828b8 };

        if (mlv >= 0x80) {
                int dcb_entry, dacoffset;

                /* note: dcb_entry_idx_from_crtchead needs pre-script set-up */
                dcb_entry = dcb_entry_idx_from_crtchead(dev);
                if (dcb_entry == 0x7f)
                        return 0;
                dacoffset = pramdac_offset[bios->dcb.entry[dcb_entry].or];
                if (mlv == 0x81)
                        dacoffset ^= 8;
                return 0x6808b0 + dacoffset;
        } else {
                if (mlv >= ARRAY_SIZE(pramdac_table)) {
                        NV_ERROR(dev, "Magic Lookup Value too big (%02X)\n",
                                                                        mlv);
                        return 0;
                }
                return pramdac_table[mlv];
        }
}

static int
init_io_restrict_prog(struct nvbios *bios, uint16_t offset,
                      struct init_exec *iexec)
{
        /*
         * INIT_IO_RESTRICT_PROG   opcode: 0x32 ('2')
         *
         * offset      (8  bit): opcode
         * offset + 1  (16 bit): CRTC port
         * offset + 3  (8  bit): CRTC index
         * offset + 4  (8  bit): mask
         * offset + 5  (8  bit): shift
         * offset + 6  (8  bit): count
         * offset + 7  (32 bit): register
         * offset + 11 (32 bit): configuration 1
         * ...
         *
         * Starting at offset + 11 there are "count" 32 bit values.
         * To find out which value to use read index "CRTC index" on "CRTC
         * port", AND this value with "mask" and then bit shift right "shift"
         * bits.  Read the appropriate value using this index and write to
         * "register"
         */

        uint16_t crtcport = ROM16(bios->data[offset + 1]);
        uint8_t crtcindex = bios->data[offset + 3];
        uint8_t mask = bios->data[offset + 4];
        uint8_t shift = bios->data[offset + 5];
        uint8_t count = bios->data[offset + 6];
        uint32_t reg = ROM32(bios->data[offset + 7]);
        uint8_t config;
        uint32_t configval;
        int len = 11 + count * 4;

        if (!iexec->execute)
                return len;

        BIOSLOG(bios, "0x%04X: Port: 0x%04X, Index: 0x%02X, Mask: 0x%02X, "
                      "Shift: 0x%02X, Count: 0x%02X, Reg: 0x%08X\n",
                offset, crtcport, crtcindex, mask, shift, count, reg);

        config = (bios_idxprt_rd(bios, crtcport, crtcindex) & mask) >> shift;
        if (config > count) {
                NV_ERROR(bios->dev,
                         "0x%04X: Config 0x%02X exceeds maximal bound 0x%02X\n",
                         offset, config, count);
                return len;
        }

        configval = ROM32(bios->data[offset + 11 + config * 4]);

        BIOSLOG(bios, "0x%04X: Writing config %02X\n", offset, config);

        bios_wr32(bios, reg, configval);

        return len;
}

static int
init_repeat(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_REPEAT   opcode: 0x33 ('3')
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): count
         *
         * Execute script following this opcode up to INIT_REPEAT_END
         * "count" times
         */

        uint8_t count = bios->data[offset + 1];
        uint8_t i;

        /* no iexec->execute check by design */

        BIOSLOG(bios, "0x%04X: Repeating following segment %d times\n",
                offset, count);

        iexec->repeat = true;

        /*
         * count - 1, as the script block will execute once when we leave this
         * opcode -- this is compatible with bios behaviour as:
         * a) the block is always executed at least once, even if count == 0
         * b) the bios interpreter skips to the op following INIT_END_REPEAT,
         * while we don't
         */
        for (i = 0; i < count - 1; i++)
                parse_init_table(bios, offset + 2, iexec);

        iexec->repeat = false;

        return 2;
}

static int
init_io_restrict_pll(struct nvbios *bios, uint16_t offset,
                     struct init_exec *iexec)
{
        /*
         * INIT_IO_RESTRICT_PLL   opcode: 0x34 ('4')
         *
         * offset      (8  bit): opcode
         * offset + 1  (16 bit): CRTC port
         * offset + 3  (8  bit): CRTC index
         * offset + 4  (8  bit): mask
         * offset + 5  (8  bit): shift
         * offset + 6  (8  bit): IO flag condition index
         * offset + 7  (8  bit): count
         * offset + 8  (32 bit): register
         * offset + 12 (16 bit): frequency 1
         * ...
         *
         * Starting at offset + 12 there are "count" 16 bit frequencies (10kHz).
         * Set PLL register "register" to coefficients for frequency n,
         * selected by reading index "CRTC index" of "CRTC port" ANDed with
         * "mask" and shifted right by "shift".
         *
         * If "IO flag condition index" > 0, and condition met, double
         * frequency before setting it.
         */

        uint16_t crtcport = ROM16(bios->data[offset + 1]);
        uint8_t crtcindex = bios->data[offset + 3];
        uint8_t mask = bios->data[offset + 4];
        uint8_t shift = bios->data[offset + 5];
        int8_t io_flag_condition_idx = bios->data[offset + 6];
        uint8_t count = bios->data[offset + 7];
        uint32_t reg = ROM32(bios->data[offset + 8]);
        uint8_t config;
        uint16_t freq;
        int len = 12 + count * 2;

        if (!iexec->execute)
                return len;

        BIOSLOG(bios, "0x%04X: Port: 0x%04X, Index: 0x%02X, Mask: 0x%02X, "
                      "Shift: 0x%02X, IO Flag Condition: 0x%02X, "
                      "Count: 0x%02X, Reg: 0x%08X\n",
                offset, crtcport, crtcindex, mask, shift,
                io_flag_condition_idx, count, reg);

        config = (bios_idxprt_rd(bios, crtcport, crtcindex) & mask) >> shift;
        if (config > count) {
                NV_ERROR(bios->dev,
                         "0x%04X: Config 0x%02X exceeds maximal bound 0x%02X\n",
                         offset, config, count);
                return len;
        }

        freq = ROM16(bios->data[offset + 12 + config * 2]);

        if (io_flag_condition_idx > 0) {
                if (io_flag_condition_met(bios, offset, io_flag_condition_idx)) {
                        BIOSLOG(bios, "0x%04X: Condition fulfilled -- "
                                      "frequency doubled\n", offset);
                        freq *= 2;
                } else
                        BIOSLOG(bios, "0x%04X: Condition not fulfilled -- "
                                      "frequency unchanged\n", offset);
        }

        BIOSLOG(bios, "0x%04X: Reg: 0x%08X, Config: 0x%02X, Freq: %d0kHz\n",
                offset, reg, config, freq);

        setPLL(bios, reg, freq * 10);

        return len;
}

static int
init_end_repeat(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_END_REPEAT   opcode: 0x36 ('6')
         *
         * offset      (8 bit): opcode
         *
         * Marks the end of the block for INIT_REPEAT to repeat
         */

        /* no iexec->execute check by design */

        /*
         * iexec->repeat flag necessary to go past INIT_END_REPEAT opcode when
         * we're not in repeat mode
         */
        if (iexec->repeat)
                return 0;

        return 1;
}

static int
init_copy(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_COPY   opcode: 0x37 ('7')
         *
         * offset      (8  bit): opcode
         * offset + 1  (32 bit): register
         * offset + 5  (8  bit): shift
         * offset + 6  (8  bit): srcmask
         * offset + 7  (16 bit): CRTC port
         * offset + 9  (8 bit): CRTC index
         * offset + 10  (8 bit): mask
         *
         * Read index "CRTC index" on "CRTC port", AND with "mask", OR with
         * (REGVAL("register") >> "shift" & "srcmask") and write-back to CRTC
         * port
         */

        uint32_t reg = ROM32(bios->data[offset + 1]);
        uint8_t shift = bios->data[offset + 5];
        uint8_t srcmask = bios->data[offset + 6];
        uint16_t crtcport = ROM16(bios->data[offset + 7]);
        uint8_t crtcindex = bios->data[offset + 9];
        uint8_t mask = bios->data[offset + 10];
        uint32_t data;
        uint8_t crtcdata;

        if (!iexec->execute)
                return 11;

        BIOSLOG(bios, "0x%04X: Reg: 0x%08X, Shift: 0x%02X, SrcMask: 0x%02X, "
                      "Port: 0x%04X, Index: 0x%02X, Mask: 0x%02X\n",
                offset, reg, shift, srcmask, crtcport, crtcindex, mask);

        data = bios_rd32(bios, reg);

        if (shift < 0x80)
                data >>= shift;
        else
                data <<= (0x100 - shift);

        data &= srcmask;

        crtcdata  = bios_idxprt_rd(bios, crtcport, crtcindex) & mask;
        crtcdata |= (uint8_t)data;
        bios_idxprt_wr(bios, crtcport, crtcindex, crtcdata);

        return 11;
}

static int
init_not(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_NOT   opcode: 0x38 ('8')
         *
         * offset      (8  bit): opcode
         *
         * Invert the current execute / no-execute condition (i.e. "else")
         */
        if (iexec->execute)
                BIOSLOG(bios, "0x%04X: ------ Skipping following commands  ------\n", offset);
        else
                BIOSLOG(bios, "0x%04X: ------ Executing following commands ------\n", offset);

        iexec->execute = !iexec->execute;
        return 1;
}

static int
init_io_flag_condition(struct nvbios *bios, uint16_t offset,
                       struct init_exec *iexec)
{
        /*
         * INIT_IO_FLAG_CONDITION   opcode: 0x39 ('9')
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): condition number
         *
         * Check condition "condition number" in the IO flag condition table.
         * If condition not met skip subsequent opcodes until condition is
         * inverted (INIT_NOT), or we hit INIT_RESUME
         */

        uint8_t cond = bios->data[offset + 1];

        if (!iexec->execute)
                return 2;

        if (io_flag_condition_met(bios, offset, cond))
                BIOSLOG(bios, "0x%04X: Condition fulfilled -- continuing to execute\n", offset);
        else {
                BIOSLOG(bios, "0x%04X: Condition not fulfilled -- skipping following commands\n", offset);
                iexec->execute = false;
        }

        return 2;
}

static int
init_dp_condition(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_DP_CONDITION   opcode: 0x3A ('')
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): "sub" opcode
         * offset + 2  (8 bit): unknown
         *
         */

        struct bit_displayport_encoder_table *dpe = NULL;
        struct dcb_entry *dcb = bios->display.output;
        struct drm_device *dev = bios->dev;
        uint8_t cond = bios->data[offset + 1];
        int dummy;

        BIOSLOG(bios, "0x%04X: subop 0x%02X\n", offset, cond);

        if (!iexec->execute)
                return 3;

        dpe = nouveau_bios_dp_table(dev, dcb, &dummy);
        if (!dpe) {
                NV_ERROR(dev, "0x%04X: INIT_3A: no encoder table!!\n", offset);
                return 3;
        }

        switch (cond) {
        case 0:
        {
                struct dcb_connector_table_entry *ent =
                        &bios->dcb.connector.entry[dcb->connector];

                if (ent->type != DCB_CONNECTOR_eDP)
                        iexec->execute = false;
        }
                break;
        case 1:
        case 2:
                if (!(dpe->unknown & cond))
                        iexec->execute = false;
                break;
        case 5:
        {
                struct nouveau_i2c_chan *auxch;
                int ret;

                auxch = nouveau_i2c_find(dev, bios->display.output->i2c_index);
                if (!auxch) {
                        NV_ERROR(dev, "0x%04X: couldn't get auxch\n", offset);
                        return 3;
                }

                ret = nouveau_dp_auxch(auxch, 9, 0xd, &cond, 1);
                if (ret) {
                        NV_ERROR(dev, "0x%04X: auxch rd fail: %d\n", offset, ret);
                        return 3;
                }

                if (!(cond & 1))
                        iexec->execute = false;
        }
                break;
        default:
                NV_WARN(dev, "0x%04X: unknown INIT_3A op: %d\n", offset, cond);
                break;
        }

        if (iexec->execute)
                BIOSLOG(bios, "0x%04X: continuing to execute\n", offset);
        else
                BIOSLOG(bios, "0x%04X: skipping following commands\n", offset);

        return 3;
}

static int
init_op_3b(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_3B   opcode: 0x3B ('')
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): crtc index
         *
         */

        uint8_t or = ffs(bios->display.output->or) - 1;
        uint8_t index = bios->data[offset + 1];
        uint8_t data;

        if (!iexec->execute)
                return 2;

        data = bios_idxprt_rd(bios, 0x3d4, index);
        bios_idxprt_wr(bios, 0x3d4, index, data & ~(1 << or));
        return 2;
}

static int
init_op_3c(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_3C   opcode: 0x3C ('')
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): crtc index
         *
         */

        uint8_t or = ffs(bios->display.output->or) - 1;
        uint8_t index = bios->data[offset + 1];
        uint8_t data;

        if (!iexec->execute)
                return 2;

        data = bios_idxprt_rd(bios, 0x3d4, index);
        bios_idxprt_wr(bios, 0x3d4, index, data | (1 << or));
        return 2;
}

static int
init_idx_addr_latched(struct nvbios *bios, uint16_t offset,
                      struct init_exec *iexec)
{
        /*
         * INIT_INDEX_ADDRESS_LATCHED   opcode: 0x49 ('I')
         *
         * offset      (8  bit): opcode
         * offset + 1  (32 bit): control register
         * offset + 5  (32 bit): data register
         * offset + 9  (32 bit): mask
         * offset + 13 (32 bit): data
         * offset + 17 (8  bit): count
         * offset + 18 (8  bit): address 1
         * offset + 19 (8  bit): data 1
         * ...
         *
         * For each of "count" address and data pairs, write "data n" to
         * "data register", read the current value of "control register",
         * and write it back once ANDed with "mask", ORed with "data",
         * and ORed with "address n"
         */

        uint32_t controlreg = ROM32(bios->data[offset + 1]);
        uint32_t datareg = ROM32(bios->data[offset + 5]);
        uint32_t mask = ROM32(bios->data[offset + 9]);
        uint32_t data = ROM32(bios->data[offset + 13]);
        uint8_t count = bios->data[offset + 17];
        int len = 18 + count * 2;
        uint32_t value;
        int i;

        if (!iexec->execute)
                return len;

        BIOSLOG(bios, "0x%04X: ControlReg: 0x%08X, DataReg: 0x%08X, "
                      "Mask: 0x%08X, Data: 0x%08X, Count: 0x%02X\n",
                offset, controlreg, datareg, mask, data, count);

        for (i = 0; i < count; i++) {
                uint8_t instaddress = bios->data[offset + 18 + i * 2];
                uint8_t instdata = bios->data[offset + 19 + i * 2];

                BIOSLOG(bios, "0x%04X: Address: 0x%02X, Data: 0x%02X\n",
                        offset, instaddress, instdata);

                bios_wr32(bios, datareg, instdata);
                value  = bios_rd32(bios, controlreg) & mask;
                value |= data;
                value |= instaddress;
                bios_wr32(bios, controlreg, value);
        }

        return len;
}

static int
init_io_restrict_pll2(struct nvbios *bios, uint16_t offset,
                      struct init_exec *iexec)
{
        /*
         * INIT_IO_RESTRICT_PLL2   opcode: 0x4A ('J')
         *
         * offset      (8  bit): opcode
         * offset + 1  (16 bit): CRTC port
         * offset + 3  (8  bit): CRTC index
         * offset + 4  (8  bit): mask
         * offset + 5  (8  bit): shift
         * offset + 6  (8  bit): count
         * offset + 7  (32 bit): register
         * offset + 11 (32 bit): frequency 1
         * ...
         *
         * Starting at offset + 11 there are "count" 32 bit frequencies (kHz).
         * Set PLL register "register" to coefficients for frequency n,
         * selected by reading index "CRTC index" of "CRTC port" ANDed with
         * "mask" and shifted right by "shift".
         */

        uint16_t crtcport = ROM16(bios->data[offset + 1]);
        uint8_t crtcindex = bios->data[offset + 3];
        uint8_t mask = bios->data[offset + 4];
        uint8_t shift = bios->data[offset + 5];
        uint8_t count = bios->data[offset + 6];
        uint32_t reg = ROM32(bios->data[offset + 7]);
        int len = 11 + count * 4;
        uint8_t config;
        uint32_t freq;

        if (!iexec->execute)
                return len;

        BIOSLOG(bios, "0x%04X: Port: 0x%04X, Index: 0x%02X, Mask: 0x%02X, "
                      "Shift: 0x%02X, Count: 0x%02X, Reg: 0x%08X\n",
                offset, crtcport, crtcindex, mask, shift, count, reg);

        if (!reg)
                return len;

        config = (bios_idxprt_rd(bios, crtcport, crtcindex) & mask) >> shift;
        if (config > count) {
                NV_ERROR(bios->dev,
                         "0x%04X: Config 0x%02X exceeds maximal bound 0x%02X\n",
                         offset, config, count);
                return len;
        }

        freq = ROM32(bios->data[offset + 11 + config * 4]);

        BIOSLOG(bios, "0x%04X: Reg: 0x%08X, Config: 0x%02X, Freq: %dkHz\n",
                offset, reg, config, freq);

        setPLL(bios, reg, freq);

        return len;
}

static int
init_pll2(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_PLL2   opcode: 0x4B ('K')
         *
         * offset      (8  bit): opcode
         * offset + 1  (32 bit): register
         * offset + 5  (32 bit): freq
         *
         * Set PLL register "register" to coefficients for frequency "freq"
         */

        uint32_t reg = ROM32(bios->data[offset + 1]);
        uint32_t freq = ROM32(bios->data[offset + 5]);

        if (!iexec->execute)
                return 9;

        BIOSLOG(bios, "0x%04X: Reg: 0x%04X, Freq: %dkHz\n",
                offset, reg, freq);

        setPLL(bios, reg, freq);
        return 9;
}

static int
init_i2c_byte(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_I2C_BYTE   opcode: 0x4C ('L')
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): DCB I2C table entry index
         * offset + 2  (8 bit): I2C slave address
         * offset + 3  (8 bit): count
         * offset + 4  (8 bit): I2C register 1
         * offset + 5  (8 bit): mask 1
         * offset + 6  (8 bit): data 1
         * ...
         *
         * For each of "count" registers given by "I2C register n" on the device
         * addressed by "I2C slave address" on the I2C bus given by
         * "DCB I2C table entry index", read the register, AND the result with
         * "mask n" and OR it with "data n" before writing it back to the device
         */

        struct drm_device *dev = bios->dev;
        uint8_t i2c_index = bios->data[offset + 1];
        uint8_t i2c_address = bios->data[offset + 2] >> 1;
        uint8_t count = bios->data[offset + 3];
        struct nouveau_i2c_chan *chan;
        int len = 4 + count * 3;
        int ret, i;

        if (!iexec->execute)
                return len;

        BIOSLOG(bios, "0x%04X: DCBI2CIndex: 0x%02X, I2CAddress: 0x%02X, "
                      "Count: 0x%02X\n",
                offset, i2c_index, i2c_address, count);

        chan = init_i2c_device_find(dev, i2c_index);
        if (!chan) {
                NV_ERROR(dev, "0x%04X: i2c bus not found\n", offset);
                return len;
        }

        for (i = 0; i < count; i++) {
                uint8_t reg = bios->data[offset + 4 + i * 3];
                uint8_t mask = bios->data[offset + 5 + i * 3];
                uint8_t data = bios->data[offset + 6 + i * 3];
                union i2c_smbus_data val;

                ret = i2c_smbus_xfer(&chan->adapter, i2c_address, 0,
                                     I2C_SMBUS_READ, reg,
                                     I2C_SMBUS_BYTE_DATA, &val);
                if (ret < 0) {
                        NV_ERROR(dev, "0x%04X: i2c rd fail: %d\n", offset, ret);
                        return len;
                }

                BIOSLOG(bios, "0x%04X: I2CReg: 0x%02X, Value: 0x%02X, "
                              "Mask: 0x%02X, Data: 0x%02X\n",
                        offset, reg, val.byte, mask, data);

                if (!bios->execute)
                        continue;

                val.byte &= mask;
                val.byte |= data;
                ret = i2c_smbus_xfer(&chan->adapter, i2c_address, 0,
                                     I2C_SMBUS_WRITE, reg,
                                     I2C_SMBUS_BYTE_DATA, &val);
                if (ret < 0) {
                        NV_ERROR(dev, "0x%04X: i2c wr fail: %d\n", offset, ret);
                        return len;
                }
        }

        return len;
}

static int
init_zm_i2c_byte(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_ZM_I2C_BYTE   opcode: 0x4D ('M')
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): DCB I2C table entry index
         * offset + 2  (8 bit): I2C slave address
         * offset + 3  (8 bit): count
         * offset + 4  (8 bit): I2C register 1
         * offset + 5  (8 bit): data 1
         * ...
         *
         * For each of "count" registers given by "I2C register n" on the device
         * addressed by "I2C slave address" on the I2C bus given by
         * "DCB I2C table entry index", set the register to "data n"
         */

        struct drm_device *dev = bios->dev;
        uint8_t i2c_index = bios->data[offset + 1];
        uint8_t i2c_address = bios->data[offset + 2] >> 1;
        uint8_t count = bios->data[offset + 3];
        struct nouveau_i2c_chan *chan;
        int len = 4 + count * 2;
        int ret, i;

        if (!iexec->execute)
                return len;

        BIOSLOG(bios, "0x%04X: DCBI2CIndex: 0x%02X, I2CAddress: 0x%02X, "
                      "Count: 0x%02X\n",
                offset, i2c_index, i2c_address, count);

        chan = init_i2c_device_find(dev, i2c_index);
        if (!chan) {
                NV_ERROR(dev, "0x%04X: i2c bus not found\n", offset);
                return len;
        }

        for (i = 0; i < count; i++) {
                uint8_t reg = bios->data[offset + 4 + i * 2];
                union i2c_smbus_data val;

                val.byte = bios->data[offset + 5 + i * 2];

                BIOSLOG(bios, "0x%04X: I2CReg: 0x%02X, Data: 0x%02X\n",
                        offset, reg, val.byte);

                if (!bios->execute)
                        continue;

                ret = i2c_smbus_xfer(&chan->adapter, i2c_address, 0,
                                     I2C_SMBUS_WRITE, reg,
                                     I2C_SMBUS_BYTE_DATA, &val);
                if (ret < 0) {
                        NV_ERROR(dev, "0x%04X: i2c wr fail: %d\n", offset, ret);
                        return len;
                }
        }

        return len;
}

static int
init_zm_i2c(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_ZM_I2C   opcode: 0x4E ('N')
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): DCB I2C table entry index
         * offset + 2  (8 bit): I2C slave address
         * offset + 3  (8 bit): count
         * offset + 4  (8 bit): data 1
         * ...
         *
         * Send "count" bytes ("data n") to the device addressed by "I2C slave
         * address" on the I2C bus given by "DCB I2C table entry index"
         */

        struct drm_device *dev = bios->dev;
        uint8_t i2c_index = bios->data[offset + 1];
        uint8_t i2c_address = bios->data[offset + 2] >> 1;
        uint8_t count = bios->data[offset + 3];
        int len = 4 + count;
        struct nouveau_i2c_chan *chan;
        struct i2c_msg msg;
        uint8_t data[256];
        int ret, i;

        if (!iexec->execute)
                return len;

        BIOSLOG(bios, "0x%04X: DCBI2CIndex: 0x%02X, I2CAddress: 0x%02X, "
                      "Count: 0x%02X\n",
                offset, i2c_index, i2c_address, count);

        chan = init_i2c_device_find(dev, i2c_index);
        if (!chan) {
                NV_ERROR(dev, "0x%04X: i2c bus not found\n", offset);
                return len;
        }

        for (i = 0; i < count; i++) {
                data[i] = bios->data[offset + 4 + i];

                BIOSLOG(bios, "0x%04X: Data: 0x%02X\n", offset, data[i]);
        }

        if (bios->execute) {
                msg.addr = i2c_address;
                msg.flags = 0;
                msg.len = count;
                msg.buf = data;
                ret = i2c_transfer(&chan->adapter, &msg, 1);
                if (ret != 1) {
                        NV_ERROR(dev, "0x%04X: i2c wr fail: %d\n", offset, ret);
                        return len;
                }
        }

        return len;
}

static int
init_tmds(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_TMDS   opcode: 0x4F ('O')       (non-canon name)
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): magic lookup value
         * offset + 2  (8 bit): TMDS address
         * offset + 3  (8 bit): mask
         * offset + 4  (8 bit): data
         *
         * Read the data reg for TMDS address "TMDS address", AND it with mask
         * and OR it with data, then write it back
         * "magic lookup value" determines which TMDS base address register is
         * used -- see get_tmds_index_reg()
         */

        struct drm_device *dev = bios->dev;
        uint8_t mlv = bios->data[offset + 1];
        uint32_t tmdsaddr = bios->data[offset + 2];
        uint8_t mask = bios->data[offset + 3];
        uint8_t data = bios->data[offset + 4];
        uint32_t reg, value;

        if (!iexec->execute)
                return 5;

        BIOSLOG(bios, "0x%04X: MagicLookupValue: 0x%02X, TMDSAddr: 0x%02X, "
                      "Mask: 0x%02X, Data: 0x%02X\n",
                offset, mlv, tmdsaddr, mask, data);

        reg = get_tmds_index_reg(bios->dev, mlv);
        if (!reg) {
                NV_ERROR(dev, "0x%04X: no tmds_index_reg\n", offset);
                return 5;
        }

        bios_wr32(bios, reg,
                  tmdsaddr | NV_PRAMDAC_FP_TMDS_CONTROL_WRITE_DISABLE);
        value = (bios_rd32(bios, reg + 4) & mask) | data;
        bios_wr32(bios, reg + 4, value);
        bios_wr32(bios, reg, tmdsaddr);

        return 5;
}

static int
init_zm_tmds_group(struct nvbios *bios, uint16_t offset,
                   struct init_exec *iexec)
{
        /*
         * INIT_ZM_TMDS_GROUP   opcode: 0x50 ('P')      (non-canon name)
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): magic lookup value
         * offset + 2  (8 bit): count
         * offset + 3  (8 bit): addr 1
         * offset + 4  (8 bit): data 1
         * ...
         *
         * For each of "count" TMDS address and data pairs write "data n" to
         * "addr n".  "magic lookup value" determines which TMDS base address
         * register is used -- see get_tmds_index_reg()
         */

        struct drm_device *dev = bios->dev;
        uint8_t mlv = bios->data[offset + 1];
        uint8_t count = bios->data[offset + 2];
        int len = 3 + count * 2;
        uint32_t reg;
        int i;

        if (!iexec->execute)
                return len;

        BIOSLOG(bios, "0x%04X: MagicLookupValue: 0x%02X, Count: 0x%02X\n",
                offset, mlv, count);

        reg = get_tmds_index_reg(bios->dev, mlv);
        if (!reg) {
                NV_ERROR(dev, "0x%04X: no tmds_index_reg\n", offset);
                return len;
        }

        for (i = 0; i < count; i++) {
                uint8_t tmdsaddr = bios->data[offset + 3 + i * 2];
                uint8_t tmdsdata = bios->data[offset + 4 + i * 2];

                bios_wr32(bios, reg + 4, tmdsdata);
                bios_wr32(bios, reg, tmdsaddr);
        }

        return len;
}

static int
init_cr_idx_adr_latch(struct nvbios *bios, uint16_t offset,
                      struct init_exec *iexec)
{
        /*
         * INIT_CR_INDEX_ADDRESS_LATCHED   opcode: 0x51 ('Q')
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): CRTC index1
         * offset + 2  (8 bit): CRTC index2
         * offset + 3  (8 bit): baseaddr
         * offset + 4  (8 bit): count
         * offset + 5  (8 bit): data 1
         * ...
         *
         * For each of "count" address and data pairs, write "baseaddr + n" to
         * "CRTC index1" and "data n" to "CRTC index2"
         * Once complete, restore initial value read from "CRTC index1"
         */
        uint8_t crtcindex1 = bios->data[offset + 1];
        uint8_t crtcindex2 = bios->data[offset + 2];
        uint8_t baseaddr = bios->data[offset + 3];
        uint8_t count = bios->data[offset + 4];
        int len = 5 + count;
        uint8_t oldaddr, data;
        int i;

        if (!iexec->execute)
                return len;

        BIOSLOG(bios, "0x%04X: Index1: 0x%02X, Index2: 0x%02X, "
                      "BaseAddr: 0x%02X, Count: 0x%02X\n",
                offset, crtcindex1, crtcindex2, baseaddr, count);

        oldaddr = bios_idxprt_rd(bios, NV_CIO_CRX__COLOR, crtcindex1);

        for (i = 0; i < count; i++) {
                bios_idxprt_wr(bios, NV_CIO_CRX__COLOR, crtcindex1,
                                     baseaddr + i);
                data = bios->data[offset + 5 + i];
                bios_idxprt_wr(bios, NV_CIO_CRX__COLOR, crtcindex2, data);
        }

        bios_idxprt_wr(bios, NV_CIO_CRX__COLOR, crtcindex1, oldaddr);

        return len;
}

static int
init_cr(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_CR   opcode: 0x52 ('R')
         *
         * offset      (8  bit): opcode
         * offset + 1  (8  bit): CRTC index
         * offset + 2  (8  bit): mask
         * offset + 3  (8  bit): data
         *
         * Assign the value of at "CRTC index" ANDed with mask and ORed with
         * data back to "CRTC index"
         */

        uint8_t crtcindex = bios->data[offset + 1];
        uint8_t mask = bios->data[offset + 2];
        uint8_t data = bios->data[offset + 3];
        uint8_t value;

        if (!iexec->execute)
                return 4;

        BIOSLOG(bios, "0x%04X: Index: 0x%02X, Mask: 0x%02X, Data: 0x%02X\n",
                offset, crtcindex, mask, data);

        value  = bios_idxprt_rd(bios, NV_CIO_CRX__COLOR, crtcindex) & mask;
        value |= data;
        bios_idxprt_wr(bios, NV_CIO_CRX__COLOR, crtcindex, value);

        return 4;
}

static int
init_zm_cr(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_ZM_CR   opcode: 0x53 ('S')
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): CRTC index
         * offset + 2  (8 bit): value
         *
         * Assign "value" to CRTC register with index "CRTC index".
         */

        uint8_t crtcindex = ROM32(bios->data[offset + 1]);
        uint8_t data = bios->data[offset + 2];

        if (!iexec->execute)
                return 3;

        bios_idxprt_wr(bios, NV_CIO_CRX__COLOR, crtcindex, data);

        return 3;
}

static int
init_zm_cr_group(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_ZM_CR_GROUP   opcode: 0x54 ('T')
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): count
         * offset + 2  (8 bit): CRTC index 1
         * offset + 3  (8 bit): value 1
         * ...
         *
         * For "count", assign "value n" to CRTC register with index
         * "CRTC index n".
         */

        uint8_t count = bios->data[offset + 1];
        int len = 2 + count * 2;
        int i;

        if (!iexec->execute)
                return len;

        for (i = 0; i < count; i++)
                init_zm_cr(bios, offset + 2 + 2 * i - 1, iexec);

        return len;
}

static int
init_condition_time(struct nvbios *bios, uint16_t offset,
                    struct init_exec *iexec)
{
        /*
         * INIT_CONDITION_TIME   opcode: 0x56 ('V')
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): condition number
         * offset + 2  (8 bit): retries / 50
         *
         * Check condition "condition number" in the condition table.
         * Bios code then sleeps for 2ms if the condition is not met, and
         * repeats up to "retries" times, but on one C51 this has proved
         * insufficient.  In mmiotraces the driver sleeps for 20ms, so we do
         * this, and bail after "retries" times, or 2s, whichever is less.
         * If still not met after retries, clear execution flag for this table.
         */

        uint8_t cond = bios->data[offset + 1];
        uint16_t retries = bios->data[offset + 2] * 50;
        unsigned cnt;

        if (!iexec->execute)
                return 3;

        if (retries > 100)
                retries = 100;

        BIOSLOG(bios, "0x%04X: Condition: 0x%02X, Retries: 0x%02X\n",
                offset, cond, retries);

        if (!bios->execute) /* avoid 2s delays when "faking" execution */
                retries = 1;

        for (cnt = 0; cnt < retries; cnt++) {
                if (bios_condition_met(bios, offset, cond)) {
                        BIOSLOG(bios, "0x%04X: Condition met, continuing\n",
                                                                offset);
                        break;
                } else {
                        BIOSLOG(bios, "0x%04X: "
                                "Condition not met, sleeping for 20ms\n",
                                                                offset);
                        mdelay(20);
                }
        }

        if (!bios_condition_met(bios, offset, cond)) {
                NV_WARN(bios->dev,
                        "0x%04X: Condition still not met after %dms, "
                        "skipping following opcodes\n", offset, 20 * retries);
                iexec->execute = false;
        }

        return 3;
}

static int
init_ltime(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_LTIME   opcode: 0x57 ('V')
         *
         * offset      (8  bit): opcode
         * offset + 1  (16 bit): time
         *
         * Sleep for "time" milliseconds.
         */

        unsigned time = ROM16(bios->data[offset + 1]);

        if (!iexec->execute)
                return 3;

        BIOSLOG(bios, "0x%04X: Sleeping for 0x%04X milliseconds\n",
                offset, time);

        mdelay(time);

        return 3;
}

static int
init_zm_reg_sequence(struct nvbios *bios, uint16_t offset,
                     struct init_exec *iexec)
{
        /*
         * INIT_ZM_REG_SEQUENCE   opcode: 0x58 ('X')
         *
         * offset      (8  bit): opcode
         * offset + 1  (32 bit): base register
         * offset + 5  (8  bit): count
         * offset + 6  (32 bit): value 1
         * ...
         *
         * Starting at offset + 6 there are "count" 32 bit values.
         * For "count" iterations set "base register" + 4 * current_iteration
         * to "value current_iteration"
         */

        uint32_t basereg = ROM32(bios->data[offset + 1]);
        uint32_t count = bios->data[offset + 5];
        int len = 6 + count * 4;
        int i;

        if (!iexec->execute)
                return len;

        BIOSLOG(bios, "0x%04X: BaseReg: 0x%08X, Count: 0x%02X\n",
                offset, basereg, count);

        for (i = 0; i < count; i++) {
                uint32_t reg = basereg + i * 4;
                uint32_t data = ROM32(bios->data[offset + 6 + i * 4]);

                bios_wr32(bios, reg, data);
        }

        return len;
}

static int
init_sub_direct(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_SUB_DIRECT   opcode: 0x5B ('[')
         *
         * offset      (8  bit): opcode
         * offset + 1  (16 bit): subroutine offset (in bios)
         *
         * Calls a subroutine that will execute commands until INIT_DONE
         * is found.
         */

        uint16_t sub_offset = ROM16(bios->data[offset + 1]);

        if (!iexec->execute)
                return 3;

        BIOSLOG(bios, "0x%04X: Executing subroutine at 0x%04X\n",
                offset, sub_offset);

        parse_init_table(bios, sub_offset, iexec);

        BIOSLOG(bios, "0x%04X: End of 0x%04X subroutine\n", offset, sub_offset);

        return 3;
}

static int
init_jump(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_JUMP   opcode: 0x5C ('\')
         *
         * offset      (8  bit): opcode
         * offset + 1  (16 bit): offset (in bios)
         *
         * Continue execution of init table from 'offset'
         */

        uint16_t jmp_offset = ROM16(bios->data[offset + 1]);

        if (!iexec->execute)
                return 3;

        BIOSLOG(bios, "0x%04X: Jump to 0x%04X\n", offset, jmp_offset);
        return jmp_offset - offset;
}

static int
init_i2c_if(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_I2C_IF   opcode: 0x5E ('^')
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): DCB I2C table entry index
         * offset + 2  (8 bit): I2C slave address
         * offset + 3  (8 bit): I2C register
         * offset + 4  (8 bit): mask
         * offset + 5  (8 bit): data
         *
         * Read the register given by "I2C register" on the device addressed
         * by "I2C slave address" on the I2C bus given by "DCB I2C table
         * entry index". Compare the result AND "mask" to "data".
         * If they're not equal, skip subsequent opcodes until condition is
         * inverted (INIT_NOT), or we hit INIT_RESUME
         */

        uint8_t i2c_index = bios->data[offset + 1];
        uint8_t i2c_address = bios->data[offset + 2] >> 1;
        uint8_t reg = bios->data[offset + 3];
        uint8_t mask = bios->data[offset + 4];
        uint8_t data = bios->data[offset + 5];
        struct nouveau_i2c_chan *chan;
        union i2c_smbus_data val;
        int ret;

        /* no execute check by design */

        BIOSLOG(bios, "0x%04X: DCBI2CIndex: 0x%02X, I2CAddress: 0x%02X\n",
                offset, i2c_index, i2c_address);

        chan = init_i2c_device_find(bios->dev, i2c_index);
        if (!chan)
                return -ENODEV;

        ret = i2c_smbus_xfer(&chan->adapter, i2c_address, 0,
                             I2C_SMBUS_READ, reg,
                             I2C_SMBUS_BYTE_DATA, &val);
        if (ret < 0) {
                BIOSLOG(bios, "0x%04X: I2CReg: 0x%02X, Value: [no device], "
                              "Mask: 0x%02X, Data: 0x%02X\n",
                        offset, reg, mask, data);
                iexec->execute = 0;
                return 6;
        }

        BIOSLOG(bios, "0x%04X: I2CReg: 0x%02X, Value: 0x%02X, "
                      "Mask: 0x%02X, Data: 0x%02X\n",
                offset, reg, val.byte, mask, data);

        iexec->execute = ((val.byte & mask) == data);

        return 6;
}

static int
init_copy_nv_reg(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_COPY_NV_REG   opcode: 0x5F ('_')
         *
         * offset      (8  bit): opcode
         * offset + 1  (32 bit): src reg
         * offset + 5  (8  bit): shift
         * offset + 6  (32 bit): src mask
         * offset + 10 (32 bit): xor
         * offset + 14 (32 bit): dst reg
         * offset + 18 (32 bit): dst mask
         *
         * Shift REGVAL("src reg") right by (signed) "shift", AND result with
         * "src mask", then XOR with "xor". Write this OR'd with
         * (REGVAL("dst reg") AND'd with "dst mask") to "dst reg"
         */

        uint32_t srcreg = *((uint32_t *)(&bios->data[offset + 1]));
        uint8_t shift = bios->data[offset + 5];
        uint32_t srcmask = *((uint32_t *)(&bios->data[offset + 6]));
        uint32_t xor = *((uint32_t *)(&bios->data[offset + 10]));
        uint32_t dstreg = *((uint32_t *)(&bios->data[offset + 14]));
        uint32_t dstmask = *((uint32_t *)(&bios->data[offset + 18]));
        uint32_t srcvalue, dstvalue;

        if (!iexec->execute)
                return 22;

        BIOSLOG(bios, "0x%04X: SrcReg: 0x%08X, Shift: 0x%02X, SrcMask: 0x%08X, "
                      "Xor: 0x%08X, DstReg: 0x%08X, DstMask: 0x%08X\n",
                offset, srcreg, shift, srcmask, xor, dstreg, dstmask);

        srcvalue = bios_rd32(bios, srcreg);

        if (shift < 0x80)
                srcvalue >>= shift;
        else
                srcvalue <<= (0x100 - shift);

        srcvalue = (srcvalue & srcmask) ^ xor;

        dstvalue = bios_rd32(bios, dstreg) & dstmask;

        bios_wr32(bios, dstreg, dstvalue | srcvalue);

        return 22;
}

static int
init_zm_index_io(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_ZM_INDEX_IO   opcode: 0x62 ('b')
         *
         * offset      (8  bit): opcode
         * offset + 1  (16 bit): CRTC port
         * offset + 3  (8  bit): CRTC index
         * offset + 4  (8  bit): data
         *
         * Write "data" to index "CRTC index" of "CRTC port"
         */
        uint16_t crtcport = ROM16(bios->data[offset + 1]);
        uint8_t crtcindex = bios->data[offset + 3];
        uint8_t data = bios->data[offset + 4];

        if (!iexec->execute)
                return 5;

        bios_idxprt_wr(bios, crtcport, crtcindex, data);

        return 5;
}

static inline void
bios_md32(struct nvbios *bios, uint32_t reg,
          uint32_t mask, uint32_t val)
{
        bios_wr32(bios, reg, (bios_rd32(bios, reg) & ~mask) | val);
}

static uint32_t
peek_fb(struct drm_device *dev, struct io_mapping *fb,
        uint32_t off)
{
        uint32_t val = 0;

        if (off < pci_resource_len(dev->pdev, 1)) {
                uint8_t __iomem *p =
                        io_mapping_map_atomic_wc(fb, off & PAGE_MASK);

                val = ioread32(p + (off & ~PAGE_MASK));

                io_mapping_unmap_atomic(p);
        }

        return val;
}

static void
poke_fb(struct drm_device *dev, struct io_mapping *fb,
        uint32_t off, uint32_t val)
{
        if (off < pci_resource_len(dev->pdev, 1)) {
                uint8_t __iomem *p =
                        io_mapping_map_atomic_wc(fb, off & PAGE_MASK);

                iowrite32(val, p + (off & ~PAGE_MASK));
                wmb();

                io_mapping_unmap_atomic(p);
        }
}

static inline bool
read_back_fb(struct drm_device *dev, struct io_mapping *fb,
             uint32_t off, uint32_t val)
{
        poke_fb(dev, fb, off, val);
        return val == peek_fb(dev, fb, off);
}

static int
nv04_init_compute_mem(struct nvbios *bios)
{
        struct drm_device *dev = bios->dev;
        uint32_t patt = 0xdeadbeef;
        struct io_mapping *fb;
        int i;

        /* Map the framebuffer aperture */
        fb = io_mapping_create_wc(pci_resource_start(dev->pdev, 1),
                                  pci_resource_len(dev->pdev, 1));
        if (!fb)
                return -ENOMEM;

        /* Sequencer and refresh off */
        NVWriteVgaSeq(dev, 0, 1, NVReadVgaSeq(dev, 0, 1) | 0x20);
        bios_md32(bios, NV04_PFB_DEBUG_0, 0, NV04_PFB_DEBUG_0_REFRESH_OFF);

        bios_md32(bios, NV04_PFB_BOOT_0, ~0,
                  NV04_PFB_BOOT_0_RAM_AMOUNT_16MB |
                  NV04_PFB_BOOT_0_RAM_WIDTH_128 |
                  NV04_PFB_BOOT_0_RAM_TYPE_SGRAM_16MBIT);

        for (i = 0; i < 4; i++)
                poke_fb(dev, fb, 4 * i, patt);

        poke_fb(dev, fb, 0x400000, patt + 1);

        if (peek_fb(dev, fb, 0) == patt + 1) {
                bios_md32(bios, NV04_PFB_BOOT_0, NV04_PFB_BOOT_0_RAM_TYPE,
                          NV04_PFB_BOOT_0_RAM_TYPE_SDRAM_16MBIT);
                bios_md32(bios, NV04_PFB_DEBUG_0,
                          NV04_PFB_DEBUG_0_REFRESH_OFF, 0);

                for (i = 0; i < 4; i++)
                        poke_fb(dev, fb, 4 * i, patt);

                if ((peek_fb(dev, fb, 0xc) & 0xffff) != (patt & 0xffff))
                        bios_md32(bios, NV04_PFB_BOOT_0,
                                  NV04_PFB_BOOT_0_RAM_WIDTH_128 |
                                  NV04_PFB_BOOT_0_RAM_AMOUNT,
                                  NV04_PFB_BOOT_0_RAM_AMOUNT_8MB);

        } else if ((peek_fb(dev, fb, 0xc) & 0xffff0000) !=
                   (patt & 0xffff0000)) {
                bios_md32(bios, NV04_PFB_BOOT_0,
                          NV04_PFB_BOOT_0_RAM_WIDTH_128 |
                          NV04_PFB_BOOT_0_RAM_AMOUNT,
                          NV04_PFB_BOOT_0_RAM_AMOUNT_4MB);

        } else if (peek_fb(dev, fb, 0) != patt) {
                if (read_back_fb(dev, fb, 0x800000, patt))
                        bios_md32(bios, NV04_PFB_BOOT_0,
                                  NV04_PFB_BOOT_0_RAM_AMOUNT,
                                  NV04_PFB_BOOT_0_RAM_AMOUNT_8MB);
                else
                        bios_md32(bios, NV04_PFB_BOOT_0,
                                  NV04_PFB_BOOT_0_RAM_AMOUNT,
                                  NV04_PFB_BOOT_0_RAM_AMOUNT_4MB);

                bios_md32(bios, NV04_PFB_BOOT_0, NV04_PFB_BOOT_0_RAM_TYPE,
                          NV04_PFB_BOOT_0_RAM_TYPE_SGRAM_8MBIT);

        } else if (!read_back_fb(dev, fb, 0x800000, patt)) {
                bios_md32(bios, NV04_PFB_BOOT_0, NV04_PFB_BOOT_0_RAM_AMOUNT,
                          NV04_PFB_BOOT_0_RAM_AMOUNT_8MB);

        }

        /* Refresh on, sequencer on */
        bios_md32(bios, NV04_PFB_DEBUG_0, NV04_PFB_DEBUG_0_REFRESH_OFF, 0);
        NVWriteVgaSeq(dev, 0, 1, NVReadVgaSeq(dev, 0, 1) & ~0x20);

        io_mapping_free(fb);
        return 0;
}

static const uint8_t *
nv05_memory_config(struct nvbios *bios)
{
        /* Defaults for BIOSes lacking a memory config table */
        static const uint8_t default_config_tab[][2] = {
                { 0x24, 0x00 },
                { 0x28, 0x00 },
                { 0x24, 0x01 },
                { 0x1f, 0x00 },
                { 0x0f, 0x00 },
                { 0x17, 0x00 },
                { 0x06, 0x00 },
                { 0x00, 0x00 }
        };
        int i = (bios_rd32(bios, NV_PEXTDEV_BOOT_0) &
                 NV_PEXTDEV_BOOT_0_RAMCFG) >> 2;

        if (bios->legacy.mem_init_tbl_ptr)
                return &bios->data[bios->legacy.mem_init_tbl_ptr + 2 * i];
        else
                return default_config_tab[i];
}

static int
nv05_init_compute_mem(struct nvbios *bios)
{
        struct drm_device *dev = bios->dev;
        const uint8_t *ramcfg = nv05_memory_config(bios);
        uint32_t patt = 0xdeadbeef;
        struct io_mapping *fb;
        int i, v;

        /* Map the framebuffer aperture */
        fb = io_mapping_create_wc(pci_resource_start(dev->pdev, 1),
                                  pci_resource_len(dev->pdev, 1));
        if (!fb)
                return -ENOMEM;

        /* Sequencer off */
        NVWriteVgaSeq(dev, 0, 1, NVReadVgaSeq(dev, 0, 1) | 0x20);

        if (bios_rd32(bios, NV04_PFB_BOOT_0) & NV04_PFB_BOOT_0_UMA_ENABLE)
                goto out;

        bios_md32(bios, NV04_PFB_DEBUG_0, NV04_PFB_DEBUG_0_REFRESH_OFF, 0);

        /* If present load the hardcoded scrambling table */
        if (bios->legacy.mem_init_tbl_ptr) {
                uint32_t *scramble_tab = (uint32_t *)&bios->data[
                        bios->legacy.mem_init_tbl_ptr + 0x10];

                for (i = 0; i < 8; i++)
                        bios_wr32(bios, NV04_PFB_SCRAMBLE(i),
                                  ROM32(scramble_tab[i]));
        }

        /* Set memory type/width/length defaults depending on the straps */
        bios_md32(bios, NV04_PFB_BOOT_0, 0x3f, ramcfg[0]);

        if (ramcfg[1] & 0x80)
                bios_md32(bios, NV04_PFB_CFG0, 0, NV04_PFB_CFG0_SCRAMBLE);

        bios_md32(bios, NV04_PFB_CFG1, 0x700001, (ramcfg[1] & 1) << 20);
        bios_md32(bios, NV04_PFB_CFG1, 0, 1);

        /* Probe memory bus width */
        for (i = 0; i < 4; i++)
                poke_fb(dev, fb, 4 * i, patt);

        if (peek_fb(dev, fb, 0xc) != patt)
                bios_md32(bios, NV04_PFB_BOOT_0,
                          NV04_PFB_BOOT_0_RAM_WIDTH_128, 0);

        /* Probe memory length */
        v = bios_rd32(bios, NV04_PFB_BOOT_0) & NV04_PFB_BOOT_0_RAM_AMOUNT;

        if (v == NV04_PFB_BOOT_0_RAM_AMOUNT_32MB &&
            (!read_back_fb(dev, fb, 0x1000000, ++patt) ||
             !read_back_fb(dev, fb, 0, ++patt)))
                bios_md32(bios, NV04_PFB_BOOT_0, NV04_PFB_BOOT_0_RAM_AMOUNT,
                          NV04_PFB_BOOT_0_RAM_AMOUNT_16MB);

        if (v == NV04_PFB_BOOT_0_RAM_AMOUNT_16MB &&
            !read_back_fb(dev, fb, 0x800000, ++patt))
                bios_md32(bios, NV04_PFB_BOOT_0, NV04_PFB_BOOT_0_RAM_AMOUNT,
                          NV04_PFB_BOOT_0_RAM_AMOUNT_8MB);

        if (!read_back_fb(dev, fb, 0x400000, ++patt))
                bios_md32(bios, NV04_PFB_BOOT_0, NV04_PFB_BOOT_0_RAM_AMOUNT,
                          NV04_PFB_BOOT_0_RAM_AMOUNT_4MB);

out:
        /* Sequencer on */
        NVWriteVgaSeq(dev, 0, 1, NVReadVgaSeq(dev, 0, 1) & ~0x20);

        io_mapping_free(fb);
        return 0;
}

static int
nv10_init_compute_mem(struct nvbios *bios)
{
        struct drm_device *dev = bios->dev;
        struct drm_nouveau_private *dev_priv = bios->dev->dev_private;
        const int mem_width[] = { 0x10, 0x00, 0x20 };
        const int mem_width_count = (dev_priv->chipset >= 0x17 ? 3 : 2);
        uint32_t patt = 0xdeadbeef;
        struct io_mapping *fb;
        int i, j, k;

        /* Map the framebuffer aperture */
        fb = io_mapping_create_wc(pci_resource_start(dev->pdev, 1),
                                  pci_resource_len(dev->pdev, 1));
        if (!fb)
                return -ENOMEM;

        bios_wr32(bios, NV10_PFB_REFCTRL, NV10_PFB_REFCTRL_VALID_1);

        /* Probe memory bus width */
        for (i = 0; i < mem_width_count; i++) {
                bios_md32(bios, NV04_PFB_CFG0, 0x30, mem_width[i]);

                for (j = 0; j < 4; j++) {
                        for (k = 0; k < 4; k++)
                                poke_fb(dev, fb, 0x1c, 0);

                        poke_fb(dev, fb, 0x1c, patt);
                        poke_fb(dev, fb, 0x3c, 0);

                        if (peek_fb(dev, fb, 0x1c) == patt)
                                goto mem_width_found;
                }
        }

mem_width_found:
        patt <<= 1;

        /* Probe amount of installed memory */
        for (i = 0; i < 4; i++) {
                int off = bios_rd32(bios, NV04_PFB_FIFO_DATA) - 0x100000;

                poke_fb(dev, fb, off, patt);
                poke_fb(dev, fb, 0, 0);

                peek_fb(dev, fb, 0);
                peek_fb(dev, fb, 0);
                peek_fb(dev, fb, 0);
                peek_fb(dev, fb, 0);

                if (peek_fb(dev, fb, off) == patt)
                        goto amount_found;
        }

        /* IC missing - disable the upper half memory space. */
        bios_md32(bios, NV04_PFB_CFG0, 0x1000, 0);

amount_found:
        io_mapping_free(fb);
        return 0;
}

static int
nv20_init_compute_mem(struct nvbios *bios)
{
        struct drm_device *dev = bios->dev;
        struct drm_nouveau_private *dev_priv = bios->dev->dev_private;
        uint32_t mask = (dev_priv->chipset >= 0x25 ? 0x300 : 0x900);
        uint32_t amount, off;
        struct io_mapping *fb;

        /* Map the framebuffer aperture */
        fb = io_mapping_create_wc(pci_resource_start(dev->pdev, 1),
                                  pci_resource_len(dev->pdev, 1));
        if (!fb)
                return -ENOMEM;

        bios_wr32(bios, NV10_PFB_REFCTRL, NV10_PFB_REFCTRL_VALID_1);

        /* Allow full addressing */
        bios_md32(bios, NV04_PFB_CFG0, 0, mask);

        amount = bios_rd32(bios, NV04_PFB_FIFO_DATA);
        for (off = amount; off > 0x2000000; off -= 0x2000000)
                poke_fb(dev, fb, off - 4, off);

        amount = bios_rd32(bios, NV04_PFB_FIFO_DATA);
        if (amount != peek_fb(dev, fb, amount - 4))
                /* IC missing - disable the upper half memory space. */
                bios_md32(bios, NV04_PFB_CFG0, mask, 0);

        io_mapping_free(fb);
        return 0;
}

static int
init_compute_mem(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_COMPUTE_MEM   opcode: 0x63 ('c')
         *
         * offset      (8 bit): opcode
         *
         * This opcode is meant to set the PFB memory config registers
         * appropriately so that we can correctly calculate how much VRAM it
         * has (on nv10 and better chipsets the amount of installed VRAM is
         * subsequently reported in NV_PFB_CSTATUS (0x10020C)).
         *
         * The implementation of this opcode in general consists of several
         * parts:
         *
         * 1) Determination of memory type and density. Only necessary for
         *    really old chipsets, the memory type reported by the strap bits
         *    (0x101000) is assumed to be accurate on nv05 and newer.
         *
         * 2) Determination of the memory bus width. Usually done by a cunning
         *    combination of writes to offsets 0x1c and 0x3c in the fb, and
         *    seeing whether the written values are read back correctly.
         *
         *    Only necessary on nv0x-nv1x and nv34, on the other cards we can
         *    trust the straps.
         *
         * 3) Determination of how many of the card's RAM pads have ICs
         *    attached, usually done by a cunning combination of writes to an
         *    offset slightly less than the maximum memory reported by
         *    NV_PFB_CSTATUS, then seeing if the test pattern can be read back.
         *
         * This appears to be a NOP on IGPs and NV4x or newer chipsets, both io
         * logs of the VBIOS and kmmio traces of the binary driver POSTing the
         * card show nothing being done for this opcode. Why is it still listed
         * in the table?!
         */

        /* no iexec->execute check by design */

        struct drm_nouveau_private *dev_priv = bios->dev->dev_private;
        int ret;

        if (dev_priv->chipset >= 0x40 ||
            dev_priv->chipset == 0x1a ||
            dev_priv->chipset == 0x1f)
                ret = 0;
        else if (dev_priv->chipset >= 0x20 &&
                 dev_priv->chipset != 0x34)
                ret = nv20_init_compute_mem(bios);
        else if (dev_priv->chipset >= 0x10)
                ret = nv10_init_compute_mem(bios);
        else if (dev_priv->chipset >= 0x5)
                ret = nv05_init_compute_mem(bios);
        else
                ret = nv04_init_compute_mem(bios);

        if (ret)
                return ret;

        return 1;
}

static int
init_reset(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_RESET   opcode: 0x65 ('e')
         *
         * offset      (8  bit): opcode
         * offset + 1  (32 bit): register
         * offset + 5  (32 bit): value1
         * offset + 9  (32 bit): value2
         *
         * Assign "value1" to "register", then assign "value2" to "register"
         */

        uint32_t reg = ROM32(bios->data[offset + 1]);
        uint32_t value1 = ROM32(bios->data[offset + 5]);
        uint32_t value2 = ROM32(bios->data[offset + 9]);
        uint32_t pci_nv_19, pci_nv_20;

        /* no iexec->execute check by design */

        pci_nv_19 = bios_rd32(bios, NV_PBUS_PCI_NV_19);
        bios_wr32(bios, NV_PBUS_PCI_NV_19, pci_nv_19 & ~0xf00);

        bios_wr32(bios, reg, value1);

        udelay(10);

        bios_wr32(bios, reg, value2);
        bios_wr32(bios, NV_PBUS_PCI_NV_19, pci_nv_19);

        pci_nv_20 = bios_rd32(bios, NV_PBUS_PCI_NV_20);
        pci_nv_20 &= ~NV_PBUS_PCI_NV_20_ROM_SHADOW_ENABLED;     /* 0xfffffffe */
        bios_wr32(bios, NV_PBUS_PCI_NV_20, pci_nv_20);

        return 13;
}

static int
init_configure_mem(struct nvbios *bios, uint16_t offset,
                   struct init_exec *iexec)
{
        /*
         * INIT_CONFIGURE_MEM   opcode: 0x66 ('f')
         *
         * offset      (8 bit): opcode
         *
         * Equivalent to INIT_DONE on bios version 3 or greater.
         * For early bios versions, sets up the memory registers, using values
         * taken from the memory init table
         */

        /* no iexec->execute check by design */

        uint16_t meminitoffs = bios->legacy.mem_init_tbl_ptr + MEM_INIT_SIZE * (bios_idxprt_rd(bios, NV_CIO_CRX__COLOR, NV_CIO_CRE_SCRATCH4__INDEX) >> 4);
        uint16_t seqtbloffs = bios->legacy.sdr_seq_tbl_ptr, meminitdata = meminitoffs + 6;
        uint32_t reg, data;

        if (bios->major_version > 2)
                return 0;

        bios_idxprt_wr(bios, NV_VIO_SRX, NV_VIO_SR_CLOCK_INDEX, bios_idxprt_rd(
                       bios, NV_VIO_SRX, NV_VIO_SR_CLOCK_INDEX) | 0x20);

        if (bios->data[meminitoffs] & 1)
                seqtbloffs = bios->legacy.ddr_seq_tbl_ptr;

        for (reg = ROM32(bios->data[seqtbloffs]);
             reg != 0xffffffff;
             reg = ROM32(bios->data[seqtbloffs += 4])) {

                switch (reg) {
                case NV04_PFB_PRE:
                        data = NV04_PFB_PRE_CMD_PRECHARGE;
                        break;
                case NV04_PFB_PAD:
                        data = NV04_PFB_PAD_CKE_NORMAL;
                        break;
                case NV04_PFB_REF:
                        data = NV04_PFB_REF_CMD_REFRESH;
                        break;
                default:
                        data = ROM32(bios->data[meminitdata]);
                        meminitdata += 4;
                        if (data == 0xffffffff)
                                continue;
                }

                bios_wr32(bios, reg, data);
        }

        return 1;
}

static int
init_configure_clk(struct nvbios *bios, uint16_t offset,
                   struct init_exec *iexec)
{
        /*
         * INIT_CONFIGURE_CLK   opcode: 0x67 ('g')
         *
         * offset      (8 bit): opcode
         *
         * Equivalent to INIT_DONE on bios version 3 or greater.
         * For early bios versions, sets up the NVClk and MClk PLLs, using
         * values taken from the memory init table
         */

        /* no iexec->execute check by design */

        uint16_t meminitoffs = bios->legacy.mem_init_tbl_ptr + MEM_INIT_SIZE * (bios_idxprt_rd(bios, NV_CIO_CRX__COLOR, NV_CIO_CRE_SCRATCH4__INDEX) >> 4);
        int clock;

        if (bios->major_version > 2)
                return 0;

        clock = ROM16(bios->data[meminitoffs + 4]) * 10;
        setPLL(bios, NV_PRAMDAC_NVPLL_COEFF, clock);

        clock = ROM16(bios->data[meminitoffs + 2]) * 10;
        if (bios->data[meminitoffs] & 1) /* DDR */
                clock *= 2;
        setPLL(bios, NV_PRAMDAC_MPLL_COEFF, clock);

        return 1;
}

static int
init_configure_preinit(struct nvbios *bios, uint16_t offset,
                       struct init_exec *iexec)
{
        /*
         * INIT_CONFIGURE_PREINIT   opcode: 0x68 ('h')
         *
         * offset      (8 bit): opcode
         *
         * Equivalent to INIT_DONE on bios version 3 or greater.
         * For early bios versions, does early init, loading ram and crystal
         * configuration from straps into CR3C
         */

        /* no iexec->execute check by design */

        uint32_t straps = bios_rd32(bios, NV_PEXTDEV_BOOT_0);
        uint8_t cr3c = ((straps << 2) & 0xf0) | (straps & 0x40) >> 6;

        if (bios->major_version > 2)
                return 0;

        bios_idxprt_wr(bios, NV_CIO_CRX__COLOR,
                             NV_CIO_CRE_SCRATCH4__INDEX, cr3c);

        return 1;
}

static int
init_io(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_IO   opcode: 0x69 ('i')
         *
         * offset      (8  bit): opcode
         * offset + 1  (16 bit): CRTC port
         * offset + 3  (8  bit): mask
         * offset + 4  (8  bit): data
         *
         * Assign ((IOVAL("crtc port") & "mask") | "data") to "crtc port"
         */

        struct drm_nouveau_private *dev_priv = bios->dev->dev_private;
        uint16_t crtcport = ROM16(bios->data[offset + 1]);
        uint8_t mask = bios->data[offset + 3];
        uint8_t data = bios->data[offset + 4];

        if (!iexec->execute)
                return 5;

        BIOSLOG(bios, "0x%04X: Port: 0x%04X, Mask: 0x%02X, Data: 0x%02X\n",
                offset, crtcport, mask, data);

        /*
         * I have no idea what this does, but NVIDIA do this magic sequence
         * in the places where this INIT_IO happens..
         */
        if (dev_priv->card_type >= NV_50 && crtcport == 0x3c3 && data == 1) {
                int i;

                bios_wr32(bios, 0x614100, (bios_rd32(
                          bios, 0x614100) & 0x0fffffff) | 0x00800000);

                bios_wr32(bios, 0x00e18c, bios_rd32(
                          bios, 0x00e18c) | 0x00020000);

                bios_wr32(bios, 0x614900, (bios_rd32(
                          bios, 0x614900) & 0x0fffffff) | 0x00800000);

                bios_wr32(bios, 0x000200, bios_rd32(
                          bios, 0x000200) & ~0x40000000);

                mdelay(10);

                bios_wr32(bios, 0x00e18c, bios_rd32(
                          bios, 0x00e18c) & ~0x00020000);

                bios_wr32(bios, 0x000200, bios_rd32(
                          bios, 0x000200) | 0x40000000);

                bios_wr32(bios, 0x614100, 0x00800018);
                bios_wr32(bios, 0x614900, 0x00800018);

                mdelay(10);

                bios_wr32(bios, 0x614100, 0x10000018);
                bios_wr32(bios, 0x614900, 0x10000018);

                for (i = 0; i < 3; i++)
                        bios_wr32(bios, 0x614280 + (i*0x800), bios_rd32(
                                  bios, 0x614280 + (i*0x800)) & 0xf0f0f0f0);

                for (i = 0; i < 2; i++)
                        bios_wr32(bios, 0x614300 + (i*0x800), bios_rd32(
                                  bios, 0x614300 + (i*0x800)) & 0xfffff0f0);

                for (i = 0; i < 3; i++)
                        bios_wr32(bios, 0x614380 + (i*0x800), bios_rd32(
                                  bios, 0x614380 + (i*0x800)) & 0xfffff0f0);

                for (i = 0; i < 2; i++)
                        bios_wr32(bios, 0x614200 + (i*0x800), bios_rd32(
                                  bios, 0x614200 + (i*0x800)) & 0xfffffff0);

                for (i = 0; i < 2; i++)
                        bios_wr32(bios, 0x614108 + (i*0x800), bios_rd32(
                                  bios, 0x614108 + (i*0x800)) & 0x0fffffff);
                return 5;
        }

        bios_port_wr(bios, crtcport, (bios_port_rd(bios, crtcport) & mask) |
                                                                        data);
        return 5;
}

static int
init_sub(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_SUB   opcode: 0x6B ('k')
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): script number
         *
         * Execute script number "script number", as a subroutine
         */

        uint8_t sub = bios->data[offset + 1];

        if (!iexec->execute)
                return 2;

        BIOSLOG(bios, "0x%04X: Calling script %d\n", offset, sub);

        parse_init_table(bios,
                         ROM16(bios->data[bios->init_script_tbls_ptr + sub * 2]),
                         iexec);

        BIOSLOG(bios, "0x%04X: End of script %d\n", offset, sub);

        return 2;
}

static int
init_ram_condition(struct nvbios *bios, uint16_t offset,
                   struct init_exec *iexec)
{
        /*
         * INIT_RAM_CONDITION   opcode: 0x6D ('m')
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): mask
         * offset + 2  (8 bit): cmpval
         *
         * Test if (NV04_PFB_BOOT_0 & "mask") equals "cmpval".
         * If condition not met skip subsequent opcodes until condition is
         * inverted (INIT_NOT), or we hit INIT_RESUME
         */

        uint8_t mask = bios->data[offset + 1];
        uint8_t cmpval = bios->data[offset + 2];
        uint8_t data;

        if (!iexec->execute)
                return 3;

        data = bios_rd32(bios, NV04_PFB_BOOT_0) & mask;

        BIOSLOG(bios, "0x%04X: Checking if 0x%08X equals 0x%08X\n",
                offset, data, cmpval);

        if (data == cmpval)
                BIOSLOG(bios, "0x%04X: Condition fulfilled -- continuing to execute\n", offset);
        else {
                BIOSLOG(bios, "0x%04X: Condition not fulfilled -- skipping following commands\n", offset);
                iexec->execute = false;
        }

        return 3;
}

static int
init_nv_reg(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_NV_REG   opcode: 0x6E ('n')
         *
         * offset      (8  bit): opcode
         * offset + 1  (32 bit): register
         * offset + 5  (32 bit): mask
         * offset + 9  (32 bit): data
         *
         * Assign ((REGVAL("register") & "mask") | "data") to "register"
         */

        uint32_t reg = ROM32(bios->data[offset + 1]);
        uint32_t mask = ROM32(bios->data[offset + 5]);
        uint32_t data = ROM32(bios->data[offset + 9]);

        if (!iexec->execute)
                return 13;

        BIOSLOG(bios, "0x%04X: Reg: 0x%08X, Mask: 0x%08X, Data: 0x%08X\n",
                offset, reg, mask, data);

        bios_wr32(bios, reg, (bios_rd32(bios, reg) & mask) | data);

        return 13;
}

static int
init_macro(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_MACRO   opcode: 0x6F ('o')
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): macro number
         *
         * Look up macro index "macro number" in the macro index table.
         * The macro index table entry has 1 byte for the index in the macro
         * table, and 1 byte for the number of times to repeat the macro.
         * The macro table entry has 4 bytes for the register address and
         * 4 bytes for the value to write to that register
         */

        uint8_t macro_index_tbl_idx = bios->data[offset + 1];
        uint16_t tmp = bios->macro_index_tbl_ptr + (macro_index_tbl_idx * MACRO_INDEX_SIZE);
        uint8_t macro_tbl_idx = bios->data[tmp];
        uint8_t count = bios->data[tmp + 1];
        uint32_t reg, data;
        int i;

        if (!iexec->execute)
                return 2;

        BIOSLOG(bios, "0x%04X: Macro: 0x%02X, MacroTableIndex: 0x%02X, "
                      "Count: 0x%02X\n",
                offset, macro_index_tbl_idx, macro_tbl_idx, count);

        for (i = 0; i < count; i++) {
                uint16_t macroentryptr = bios->macro_tbl_ptr + (macro_tbl_idx + i) * MACRO_SIZE;

                reg = ROM32(bios->data[macroentryptr]);
                data = ROM32(bios->data[macroentryptr + 4]);

                bios_wr32(bios, reg, data);
        }

        return 2;
}

static int
init_done(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_DONE   opcode: 0x71 ('q')
         *
         * offset      (8  bit): opcode
         *
         * End the current script
         */

        /* mild retval abuse to stop parsing this table */
        return 0;
}

static int
init_resume(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_RESUME   opcode: 0x72 ('r')
         *
         * offset      (8  bit): opcode
         *
         * End the current execute / no-execute condition
         */

        if (iexec->execute)
                return 1;

        iexec->execute = true;
        BIOSLOG(bios, "0x%04X: ---- Executing following commands ----\n", offset);

        return 1;
}

static int
init_time(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_TIME   opcode: 0x74 ('t')
         *
         * offset      (8  bit): opcode
         * offset + 1  (16 bit): time
         *
         * Sleep for "time" microseconds.
         */

        unsigned time = ROM16(bios->data[offset + 1]);

        if (!iexec->execute)
                return 3;

        BIOSLOG(bios, "0x%04X: Sleeping for 0x%04X microseconds\n",
                offset, time);

        if (time < 1000)
                udelay(time);
        else
                mdelay((time + 900) / 1000);

        return 3;
}

static int
init_condition(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_CONDITION   opcode: 0x75 ('u')
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): condition number
         *
         * Check condition "condition number" in the condition table.
         * If condition not met skip subsequent opcodes until condition is
         * inverted (INIT_NOT), or we hit INIT_RESUME
         */

        uint8_t cond = bios->data[offset + 1];

        if (!iexec->execute)
                return 2;

        BIOSLOG(bios, "0x%04X: Condition: 0x%02X\n", offset, cond);

        if (bios_condition_met(bios, offset, cond))
                BIOSLOG(bios, "0x%04X: Condition fulfilled -- continuing to execute\n", offset);
        else {
                BIOSLOG(bios, "0x%04X: Condition not fulfilled -- skipping following commands\n", offset);
                iexec->execute = false;
        }

        return 2;
}

static int
init_io_condition(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_IO_CONDITION  opcode: 0x76
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): condition number
         *
         * Check condition "condition number" in the io condition table.
         * If condition not met skip subsequent opcodes until condition is
         * inverted (INIT_NOT), or we hit INIT_RESUME
         */

        uint8_t cond = bios->data[offset + 1];

        if (!iexec->execute)
                return 2;

        BIOSLOG(bios, "0x%04X: IO condition: 0x%02X\n", offset, cond);

        if (io_condition_met(bios, offset, cond))
                BIOSLOG(bios, "0x%04X: Condition fulfilled -- continuing to execute\n", offset);
        else {
                BIOSLOG(bios, "0x%04X: Condition not fulfilled -- skipping following commands\n", offset);
                iexec->execute = false;
        }

        return 2;
}

static int
init_index_io(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_INDEX_IO   opcode: 0x78 ('x')
         *
         * offset      (8  bit): opcode
         * offset + 1  (16 bit): CRTC port
         * offset + 3  (8  bit): CRTC index
         * offset + 4  (8  bit): mask
         * offset + 5  (8  bit): data
         *
         * Read value at index "CRTC index" on "CRTC port", AND with "mask",
         * OR with "data", write-back
         */

        uint16_t crtcport = ROM16(bios->data[offset + 1]);
        uint8_t crtcindex = bios->data[offset + 3];
        uint8_t mask = bios->data[offset + 4];
        uint8_t data = bios->data[offset + 5];
        uint8_t value;

        if (!iexec->execute)
                return 6;

        BIOSLOG(bios, "0x%04X: Port: 0x%04X, Index: 0x%02X, Mask: 0x%02X, "
                      "Data: 0x%02X\n",
                offset, crtcport, crtcindex, mask, data);

        value = (bios_idxprt_rd(bios, crtcport, crtcindex) & mask) | data;
        bios_idxprt_wr(bios, crtcport, crtcindex, value);

        return 6;
}

static int
init_pll(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_PLL   opcode: 0x79 ('y')
         *
         * offset      (8  bit): opcode
         * offset + 1  (32 bit): register
         * offset + 5  (16 bit): freq
         *
         * Set PLL register "register" to coefficients for frequency (10kHz)
         * "freq"
         */

        uint32_t reg = ROM32(bios->data[offset + 1]);
        uint16_t freq = ROM16(bios->data[offset + 5]);

        if (!iexec->execute)
                return 7;

        BIOSLOG(bios, "0x%04X: Reg: 0x%08X, Freq: %d0kHz\n", offset, reg, freq);

        setPLL(bios, reg, freq * 10);

        return 7;
}

static int
init_zm_reg(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_ZM_REG   opcode: 0x7A ('z')
         *
         * offset      (8  bit): opcode
         * offset + 1  (32 bit): register
         * offset + 5  (32 bit): value
         *
         * Assign "value" to "register"
         */

        uint32_t reg = ROM32(bios->data[offset + 1]);
        uint32_t value = ROM32(bios->data[offset + 5]);

        if (!iexec->execute)
                return 9;

        if (reg == 0x000200)
                value |= 1;

        bios_wr32(bios, reg, value);

        return 9;
}

static int
init_ram_restrict_pll(struct nvbios *bios, uint16_t offset,
                      struct init_exec *iexec)
{
        /*
         * INIT_RAM_RESTRICT_PLL   opcode: 0x87 ('')
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): PLL type
         * offset + 2 (32 bit): frequency 0
         *
         * Uses the RAMCFG strap of PEXTDEV_BOOT as an index into the table at
         * ram_restrict_table_ptr.  The value read from there is used to select
         * a frequency from the table starting at 'frequency 0' to be
         * programmed into the PLL corresponding to 'type'.
         *
         * The PLL limits table on cards using this opcode has a mapping of
         * 'type' to the relevant registers.
         */

        struct drm_device *dev = bios->dev;
        uint32_t strap = (bios_rd32(bios, NV_PEXTDEV_BOOT_0) & 0x0000003c) >> 2;
        uint8_t index = bios->data[bios->ram_restrict_tbl_ptr + strap];
        uint8_t type = bios->data[offset + 1];
        uint32_t freq = ROM32(bios->data[offset + 2 + (index * 4)]);
        uint8_t *pll_limits = &bios->data[bios->pll_limit_tbl_ptr], *entry;
        int len = 2 + bios->ram_restrict_group_count * 4;
        int i;

        if (!iexec->execute)
                return len;

        if (!bios->pll_limit_tbl_ptr || (pll_limits[0] & 0xf0) != 0x30) {
                NV_ERROR(dev, "PLL limits table not version 3.x\n");
                return len; /* deliberate, allow default clocks to remain */
        }

        entry = pll_limits + pll_limits[1];
        for (i = 0; i < pll_limits[3]; i++, entry += pll_limits[2]) {
                if (entry[0] == type) {
                        uint32_t reg = ROM32(entry[3]);

                        BIOSLOG(bios, "0x%04X: "
                                      "Type %02x Reg 0x%08x Freq %dKHz\n",
                                offset, type, reg, freq);

                        setPLL(bios, reg, freq);
                        return len;
                }
        }

        NV_ERROR(dev, "PLL type 0x%02x not found in PLL limits table", type);
        return len;
}

static int
init_8c(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_8C   opcode: 0x8C ('')
         *
         * NOP so far....
         *
         */

        return 1;
}

static int
init_8d(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_8D   opcode: 0x8D ('')
         *
         * NOP so far....
         *
         */

        return 1;
}

static int
init_gpio(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_GPIO   opcode: 0x8E ('')
         *
         * offset      (8 bit): opcode
         *
         * Loop over all entries in the DCB GPIO table, and initialise
         * each GPIO according to various values listed in each entry
         */

        struct drm_nouveau_private *dev_priv = bios->dev->dev_private;
        struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
        const uint32_t nv50_gpio_ctl[2] = { 0xe100, 0xe28c };
        int i;

        if (dev_priv->card_type < NV_50) {
                NV_ERROR(bios->dev, "INIT_GPIO on unsupported chipset\n");
                return 1;
        }

        if (!iexec->execute)
                return 1;

        for (i = 0; i < bios->dcb.gpio.entries; i++) {
                struct dcb_gpio_entry *gpio = &bios->dcb.gpio.entry[i];
                uint32_t r, s, v;

                BIOSLOG(bios, "0x%04X: Entry: 0x%08X\n", offset, gpio->entry);

                BIOSLOG(bios, "0x%04X: set gpio 0x%02x, state %d\n",
                        offset, gpio->tag, gpio->state_default);
                if (bios->execute)
                        pgpio->set(bios->dev, gpio->tag, gpio->state_default);

                /* The NVIDIA binary driver doesn't appear to actually do
                 * any of this, my VBIOS does however.
                 */
                /* Not a clue, needs de-magicing */
                r = nv50_gpio_ctl[gpio->line >> 4];
                s = (gpio->line & 0x0f);
                v = bios_rd32(bios, r) & ~(0x00010001 << s);
                switch ((gpio->entry & 0x06000000) >> 25) {
                case 1:
                        v |= (0x00000001 << s);
                        break;
                case 2:
                        v |= (0x00010000 << s);
                        break;
                default:
                        break;
                }
                bios_wr32(bios, r, v);
        }

        return 1;
}

static int
init_ram_restrict_zm_reg_group(struct nvbios *bios, uint16_t offset,
                               struct init_exec *iexec)
{
        /*
         * INIT_RAM_RESTRICT_ZM_REG_GROUP   opcode: 0x8F ('')
         *
         * offset      (8  bit): opcode
         * offset + 1  (32 bit): reg
         * offset + 5  (8  bit): regincrement
         * offset + 6  (8  bit): count
         * offset + 7  (32 bit): value 1,1
         * ...
         *
         * Use the RAMCFG strap of PEXTDEV_BOOT as an index into the table at
         * ram_restrict_table_ptr. The value read from here is 'n', and
         * "value 1,n" gets written to "reg". This repeats "count" times and on
         * each iteration 'm', "reg" increases by "regincrement" and
         * "value m,n" is used. The extent of n is limited by a number read
         * from the 'M' BIT table, herein called "blocklen"
         */

        uint32_t reg = ROM32(bios->data[offset + 1]);
        uint8_t regincrement = bios->data[offset + 5];
        uint8_t count = bios->data[offset + 6];
        uint32_t strap_ramcfg, data;
        /* previously set by 'M' BIT table */
        uint16_t blocklen = bios->ram_restrict_group_count * 4;
        int len = 7 + count * blocklen;
        uint8_t index;
        int i;

        /* critical! to know the length of the opcode */;
        if (!blocklen) {
                NV_ERROR(bios->dev,
                         "0x%04X: Zero block length - has the M table "
                         "been parsed?\n", offset);
                return -EINVAL;
        }

        if (!iexec->execute)
                return len;

        strap_ramcfg = (bios_rd32(bios, NV_PEXTDEV_BOOT_0) >> 2) & 0xf;
        index = bios->data[bios->ram_restrict_tbl_ptr + strap_ramcfg];

        BIOSLOG(bios, "0x%04X: Reg: 0x%08X, RegIncrement: 0x%02X, "
                      "Count: 0x%02X, StrapRamCfg: 0x%02X, Index: 0x%02X\n",
                offset, reg, regincrement, count, strap_ramcfg, index);

        for (i = 0; i < count; i++) {
                data = ROM32(bios->data[offset + 7 + index * 4 + blocklen * i]);

                bios_wr32(bios, reg, data);

                reg += regincrement;
        }

        return len;
}

static int
init_copy_zm_reg(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_COPY_ZM_REG   opcode: 0x90 ('')
         *
         * offset      (8  bit): opcode
         * offset + 1  (32 bit): src reg
         * offset + 5  (32 bit): dst reg
         *
         * Put contents of "src reg" into "dst reg"
         */

        uint32_t srcreg = ROM32(bios->data[offset + 1]);
        uint32_t dstreg = ROM32(bios->data[offset + 5]);

        if (!iexec->execute)
                return 9;

        bios_wr32(bios, dstreg, bios_rd32(bios, srcreg));

        return 9;
}

static int
init_zm_reg_group_addr_latched(struct nvbios *bios, uint16_t offset,
                               struct init_exec *iexec)
{
        /*
         * INIT_ZM_REG_GROUP_ADDRESS_LATCHED   opcode: 0x91 ('')
         *
         * offset      (8  bit): opcode
         * offset + 1  (32 bit): dst reg
         * offset + 5  (8  bit): count
         * offset + 6  (32 bit): data 1
         * ...
         *
         * For each of "count" values write "data n" to "dst reg"
         */

        uint32_t reg = ROM32(bios->data[offset + 1]);
        uint8_t count = bios->data[offset + 5];
        int len = 6 + count * 4;
        int i;

        if (!iexec->execute)
                return len;

        for (i = 0; i < count; i++) {
                uint32_t data = ROM32(bios->data[offset + 6 + 4 * i]);
                bios_wr32(bios, reg, data);
        }

        return len;
}

static int
init_reserved(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_RESERVED   opcode: 0x92 ('')
         *
         * offset      (8 bit): opcode
         *
         * Seemingly does nothing
         */

        return 1;
}

static int
init_96(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_96   opcode: 0x96 ('')
         *
         * offset      (8  bit): opcode
         * offset + 1  (32 bit): sreg
         * offset + 5  (8  bit): sshift
         * offset + 6  (8  bit): smask
         * offset + 7  (8  bit): index
         * offset + 8  (32 bit): reg
         * offset + 12 (32 bit): mask
         * offset + 16 (8  bit): shift
         *
         */

        uint16_t xlatptr = bios->init96_tbl_ptr + (bios->data[offset + 7] * 2);
        uint32_t reg = ROM32(bios->data[offset + 8]);
        uint32_t mask = ROM32(bios->data[offset + 12]);
        uint32_t val;

        val = bios_rd32(bios, ROM32(bios->data[offset + 1]));
        if (bios->data[offset + 5] < 0x80)
                val >>= bios->data[offset + 5];
        else
                val <<= (0x100 - bios->data[offset + 5]);
        val &= bios->data[offset + 6];

        val   = bios->data[ROM16(bios->data[xlatptr]) + val];
        val <<= bios->data[offset + 16];

        if (!iexec->execute)
                return 17;

        bios_wr32(bios, reg, (bios_rd32(bios, reg) & mask) | val);
        return 17;
}

static int
init_97(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_97   opcode: 0x97 ('')
         *
         * offset      (8  bit): opcode
         * offset + 1  (32 bit): register
         * offset + 5  (32 bit): mask
         * offset + 9  (32 bit): value
         *
         * Adds "value" to "register" preserving the fields specified
         * by "mask"
         */

        uint32_t reg = ROM32(bios->data[offset + 1]);
        uint32_t mask = ROM32(bios->data[offset + 5]);
        uint32_t add = ROM32(bios->data[offset + 9]);
        uint32_t val;

        val = bios_rd32(bios, reg);
        val = (val & mask) | ((val + add) & ~mask);

        if (!iexec->execute)
                return 13;

        bios_wr32(bios, reg, val);
        return 13;
}

static int
init_auxch(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_AUXCH   opcode: 0x98 ('')
         *
         * offset      (8  bit): opcode
         * offset + 1  (32 bit): address
         * offset + 5  (8  bit): count
         * offset + 6  (8  bit): mask 0
         * offset + 7  (8  bit): data 0
         *  ...
         *
         */

        struct drm_device *dev = bios->dev;
        struct nouveau_i2c_chan *auxch;
        uint32_t addr = ROM32(bios->data[offset + 1]);
        uint8_t count = bios->data[offset + 5];
        int len = 6 + count * 2;
        int ret, i;

        if (!bios->display.output) {
                NV_ERROR(dev, "INIT_AUXCH: no active output\n");
                return len;
        }

        auxch = init_i2c_device_find(dev, bios->display.output->i2c_index);
        if (!auxch) {
                NV_ERROR(dev, "INIT_AUXCH: couldn't get auxch %d\n",
                         bios->display.output->i2c_index);
                return len;
        }

        if (!iexec->execute)
                return len;

        offset += 6;
        for (i = 0; i < count; i++, offset += 2) {
                uint8_t data;

                ret = nouveau_dp_auxch(auxch, 9, addr, &data, 1);
                if (ret) {
                        NV_ERROR(dev, "INIT_AUXCH: rd auxch fail %d\n", ret);
                        return len;
                }

                data &= bios->data[offset + 0];
                data |= bios->data[offset + 1];

                ret = nouveau_dp_auxch(auxch, 8, addr, &data, 1);
                if (ret) {
                        NV_ERROR(dev, "INIT_AUXCH: wr auxch fail %d\n", ret);
                        return len;
                }
        }

        return len;
}

static int
init_zm_auxch(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_ZM_AUXCH   opcode: 0x99 ('')
         *
         * offset      (8  bit): opcode
         * offset + 1  (32 bit): address
         * offset + 5  (8  bit): count
         * offset + 6  (8  bit): data 0
         *  ...
         *
         */

        struct drm_device *dev = bios->dev;
        struct nouveau_i2c_chan *auxch;
        uint32_t addr = ROM32(bios->data[offset + 1]);
        uint8_t count = bios->data[offset + 5];
        int len = 6 + count;
        int ret, i;

        if (!bios->display.output) {
                NV_ERROR(dev, "INIT_ZM_AUXCH: no active output\n");
                return len;
        }

        auxch = init_i2c_device_find(dev, bios->display.output->i2c_index);
        if (!auxch) {
                NV_ERROR(dev, "INIT_ZM_AUXCH: couldn't get auxch %d\n",
                         bios->display.output->i2c_index);
                return len;
        }

        if (!iexec->execute)
                return len;

        offset += 6;
        for (i = 0; i < count; i++, offset++) {
                ret = nouveau_dp_auxch(auxch, 8, addr, &bios->data[offset], 1);
                if (ret) {
                        NV_ERROR(dev, "INIT_ZM_AUXCH: wr auxch fail %d\n", ret);
                        return len;
                }
        }

        return len;
}

static int
init_i2c_long_if(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * INIT_I2C_LONG_IF   opcode: 0x9A ('')
         *
         * offset      (8 bit): opcode
         * offset + 1  (8 bit): DCB I2C table entry index
         * offset + 2  (8 bit): I2C slave address
         * offset + 3  (16 bit): I2C register
         * offset + 5  (8 bit): mask
         * offset + 6  (8 bit): data
         *
         * Read the register given by "I2C register" on the device addressed
         * by "I2C slave address" on the I2C bus given by "DCB I2C table
         * entry index". Compare the result AND "mask" to "data".
         * If they're not equal, skip subsequent opcodes until condition is
         * inverted (INIT_NOT), or we hit INIT_RESUME
         */

        uint8_t i2c_index = bios->data[offset + 1];
        uint8_t i2c_address = bios->data[offset + 2] >> 1;
        uint8_t reglo = bios->data[offset + 3];
        uint8_t reghi = bios->data[offset + 4];
        uint8_t mask = bios->data[offset + 5];
        uint8_t data = bios->data[offset + 6];
        struct nouveau_i2c_chan *chan;
        uint8_t buf0[2] = { reghi, reglo };
        uint8_t buf1[1];
        struct i2c_msg msg[2] = {
                { i2c_address, 0, 1, buf0 },
                { i2c_address, I2C_M_RD, 1, buf1 },
        };
        int ret;

        /* no execute check by design */

        BIOSLOG(bios, "0x%04X: DCBI2CIndex: 0x%02X, I2CAddress: 0x%02X\n",
                offset, i2c_index, i2c_address);

        chan = init_i2c_device_find(bios->dev, i2c_index);
        if (!chan)
                return -ENODEV;


        ret = i2c_transfer(&chan->adapter, msg, 2);
        if (ret < 0) {
                BIOSLOG(bios, "0x%04X: I2CReg: 0x%02X:0x%02X, Value: [no device], "
                              "Mask: 0x%02X, Data: 0x%02X\n",
                        offset, reghi, reglo, mask, data);
                iexec->execute = 0;
                return 7;
        }

        BIOSLOG(bios, "0x%04X: I2CReg: 0x%02X:0x%02X, Value: 0x%02X, "
                      "Mask: 0x%02X, Data: 0x%02X\n",
                offset, reghi, reglo, buf1[0], mask, data);

        iexec->execute = ((buf1[0] & mask) == data);

        return 7;
}

static struct init_tbl_entry itbl_entry[] = {
        /* command name                       , id  , length  , offset  , mult    , command handler                 */
        /* INIT_PROG (0x31, 15, 10, 4) removed due to no example of use */
        { "INIT_IO_RESTRICT_PROG"             , 0x32, init_io_restrict_prog           },
        { "INIT_REPEAT"                       , 0x33, init_repeat                     },
        { "INIT_IO_RESTRICT_PLL"              , 0x34, init_io_restrict_pll            },
        { "INIT_END_REPEAT"                   , 0x36, init_end_repeat                 },
        { "INIT_COPY"                         , 0x37, init_copy                       },
        { "INIT_NOT"                          , 0x38, init_not                        },
        { "INIT_IO_FLAG_CONDITION"            , 0x39, init_io_flag_condition          },
        { "INIT_DP_CONDITION"                 , 0x3A, init_dp_condition               },
        { "INIT_OP_3B"                        , 0x3B, init_op_3b                      },
        { "INIT_OP_3C"                        , 0x3C, init_op_3c                      },
        { "INIT_INDEX_ADDRESS_LATCHED"        , 0x49, init_idx_addr_latched           },
        { "INIT_IO_RESTRICT_PLL2"             , 0x4A, init_io_restrict_pll2           },
        { "INIT_PLL2"                         , 0x4B, init_pll2                       },
        { "INIT_I2C_BYTE"                     , 0x4C, init_i2c_byte                   },
        { "INIT_ZM_I2C_BYTE"                  , 0x4D, init_zm_i2c_byte                },
        { "INIT_ZM_I2C"                       , 0x4E, init_zm_i2c                     },
        { "INIT_TMDS"                         , 0x4F, init_tmds                       },
        { "INIT_ZM_TMDS_GROUP"                , 0x50, init_zm_tmds_group              },
        { "INIT_CR_INDEX_ADDRESS_LATCHED"     , 0x51, init_cr_idx_adr_latch           },
        { "INIT_CR"                           , 0x52, init_cr                         },
        { "INIT_ZM_CR"                        , 0x53, init_zm_cr                      },
        { "INIT_ZM_CR_GROUP"                  , 0x54, init_zm_cr_group                },
        { "INIT_CONDITION_TIME"               , 0x56, init_condition_time             },
        { "INIT_LTIME"                        , 0x57, init_ltime                      },
        { "INIT_ZM_REG_SEQUENCE"              , 0x58, init_zm_reg_sequence            },
        /* INIT_INDIRECT_REG (0x5A, 7, 0, 0) removed due to no example of use */
        { "INIT_SUB_DIRECT"                   , 0x5B, init_sub_direct                 },
        { "INIT_JUMP"                         , 0x5C, init_jump                       },
        { "INIT_I2C_IF"                       , 0x5E, init_i2c_if                     },
        { "INIT_COPY_NV_REG"                  , 0x5F, init_copy_nv_reg                },
        { "INIT_ZM_INDEX_IO"                  , 0x62, init_zm_index_io                },
        { "INIT_COMPUTE_MEM"                  , 0x63, init_compute_mem                },
        { "INIT_RESET"                        , 0x65, init_reset                      },
        { "INIT_CONFIGURE_MEM"                , 0x66, init_configure_mem              },
        { "INIT_CONFIGURE_CLK"                , 0x67, init_configure_clk              },
        { "INIT_CONFIGURE_PREINIT"            , 0x68, init_configure_preinit          },
        { "INIT_IO"                           , 0x69, init_io                         },
        { "INIT_SUB"                          , 0x6B, init_sub                        },
        { "INIT_RAM_CONDITION"                , 0x6D, init_ram_condition              },
        { "INIT_NV_REG"                       , 0x6E, init_nv_reg                     },
        { "INIT_MACRO"                        , 0x6F, init_macro                      },
        { "INIT_DONE"                         , 0x71, init_done                       },
        { "INIT_RESUME"                       , 0x72, init_resume                     },
        /* INIT_RAM_CONDITION2 (0x73, 9, 0, 0) removed due to no example of use */
        { "INIT_TIME"                         , 0x74, init_time                       },
        { "INIT_CONDITION"                    , 0x75, init_condition                  },
        { "INIT_IO_CONDITION"                 , 0x76, init_io_condition               },
        { "INIT_INDEX_IO"                     , 0x78, init_index_io                   },
        { "INIT_PLL"                          , 0x79, init_pll                        },
        { "INIT_ZM_REG"                       , 0x7A, init_zm_reg                     },
        { "INIT_RAM_RESTRICT_PLL"             , 0x87, init_ram_restrict_pll           },
        { "INIT_8C"                           , 0x8C, init_8c                         },
        { "INIT_8D"                           , 0x8D, init_8d                         },
        { "INIT_GPIO"                         , 0x8E, init_gpio                       },
        { "INIT_RAM_RESTRICT_ZM_REG_GROUP"    , 0x8F, init_ram_restrict_zm_reg_group  },
        { "INIT_COPY_ZM_REG"                  , 0x90, init_copy_zm_reg                },
        { "INIT_ZM_REG_GROUP_ADDRESS_LATCHED" , 0x91, init_zm_reg_group_addr_latched  },
        { "INIT_RESERVED"                     , 0x92, init_reserved                   },
        { "INIT_96"                           , 0x96, init_96                         },
        { "INIT_97"                           , 0x97, init_97                         },
        { "INIT_AUXCH"                        , 0x98, init_auxch                      },
        { "INIT_ZM_AUXCH"                     , 0x99, init_zm_auxch                   },
        { "INIT_I2C_LONG_IF"                  , 0x9A, init_i2c_long_if                },
        { NULL                                , 0   , NULL                            }
};

#define MAX_TABLE_OPS 1000

static int
parse_init_table(struct nvbios *bios, uint16_t offset, struct init_exec *iexec)
{
        /*
         * Parses all commands in an init table.
         *
         * We start out executing all commands found in the init table. Some
         * opcodes may change the status of iexec->execute to SKIP, which will
         * cause the following opcodes to perform no operation until the value
         * is changed back to EXECUTE.
         */

        int count = 0, i, ret;
        uint8_t id;

        /*
         * Loop until INIT_DONE causes us to break out of the loop
         * (or until offset > bios length just in case... )
         * (and no more than MAX_TABLE_OPS iterations, just in case... )
         */
        while ((offset < bios->length) && (count++ < MAX_TABLE_OPS)) {
                id = bios->data[offset];

                /* Find matching id in itbl_entry */
                for (i = 0; itbl_entry[i].name && (itbl_entry[i].id != id); i++)
                        ;

                if (!itbl_entry[i].name) {
                        NV_ERROR(bios->dev,
                                 "0x%04X: Init table command not found: "
                                 "0x%02X\n", offset, id);
                        return -ENOENT;
                }

                BIOSLOG(bios, "0x%04X: [ (0x%02X) - %s ]\n", offset,
                        itbl_entry[i].id, itbl_entry[i].name);

                /* execute eventual command handler */
                ret = (*itbl_entry[i].handler)(bios, offset, iexec);
                if (ret < 0) {
                        NV_ERROR(bios->dev, "0x%04X: Failed parsing init "
                                 "table opcode: %s %d\n", offset,
                                 itbl_entry[i].name, ret);
                }

                if (ret <= 0)
                        break;

                /*
                 * Add the offset of the current command including all data
                 * of that command. The offset will then be pointing on the
                 * next op code.
                 */
                offset += ret;
        }

        if (offset >= bios->length)
                NV_WARN(bios->dev,
                        "Offset 0x%04X greater than known bios image length.  "
                        "Corrupt image?\n", offset);
        if (count >= MAX_TABLE_OPS)
                NV_WARN(bios->dev,
                        "More than %d opcodes to a table is unlikely, "
                        "is the bios image corrupt?\n", MAX_TABLE_OPS);

        return 0;
}

static void
parse_init_tables(struct nvbios *bios)
{
        /* Loops and calls parse_init_table() for each present table. */

        int i = 0;
        uint16_t table;
        struct init_exec iexec = {true, false};

        if (bios->old_style_init) {
                if (bios->init_script_tbls_ptr)
                        parse_init_table(bios, bios->init_script_tbls_ptr, &iexec);
                if (bios->extra_init_script_tbl_ptr)
                        parse_init_table(bios, bios->extra_init_script_tbl_ptr, &iexec);

                return;
        }

        while ((table = ROM16(bios->data[bios->init_script_tbls_ptr + i]))) {
                NV_INFO(bios->dev,
                        "Parsing VBIOS init table %d at offset 0x%04X\n",
                        i / 2, table);
                BIOSLOG(bios, "0x%04X: ------ Executing following commands ------\n", table);

                parse_init_table(bios, table, &iexec);
                i += 2;
        }
}

static uint16_t clkcmptable(struct nvbios *bios, uint16_t clktable, int pxclk)
{
        int compare_record_len, i = 0;
        uint16_t compareclk, scriptptr = 0;

        if (bios->major_version < 5) /* pre BIT */
                compare_record_len = 3;
        else
                compare_record_len = 4;

        do {
                compareclk = ROM16(bios->data[clktable + compare_record_len * i]);
                if (pxclk >= compareclk * 10) {
                        if (bios->major_version < 5) {
                                uint8_t tmdssub = bios->data[clktable + 2 + compare_record_len * i];
                                scriptptr = ROM16(bios->data[bios->init_script_tbls_ptr + tmdssub * 2]);
                        } else
                                scriptptr = ROM16(bios->data[clktable + 2 + compare_record_len * i]);
                        break;
                }
                i++;
        } while (compareclk);

        return scriptptr;
}

static void
run_digital_op_script(struct drm_device *dev, uint16_t scriptptr,
                      struct dcb_entry *dcbent, int head, bool dl)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        struct init_exec iexec = {true, false};

        NV_TRACE(dev, "0x%04X: Parsing digital output script table\n",
                 scriptptr);
        bios_idxprt_wr(bios, NV_CIO_CRX__COLOR, NV_CIO_CRE_44,
                       head ? NV_CIO_CRE_44_HEADB : NV_CIO_CRE_44_HEADA);
        /* note: if dcb entries have been merged, index may be misleading */
        NVWriteVgaCrtc5758(dev, head, 0, dcbent->index);
        parse_init_table(bios, scriptptr, &iexec);

        nv04_dfp_bind_head(dev, dcbent, head, dl);
}

static int call_lvds_manufacturer_script(struct drm_device *dev, struct dcb_entry *dcbent, int head, enum LVDS_script script)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        uint8_t sub = bios->data[bios->fp.xlated_entry + script] + (bios->fp.link_c_increment && dcbent->or & OUTPUT_C ? 1 : 0);
        uint16_t scriptofs = ROM16(bios->data[bios->init_script_tbls_ptr + sub * 2]);

        if (!bios->fp.xlated_entry || !sub || !scriptofs)
                return -EINVAL;

        run_digital_op_script(dev, scriptofs, dcbent, head, bios->fp.dual_link);

        if (script == LVDS_PANEL_OFF) {
                /* off-on delay in ms */
                mdelay(ROM16(bios->data[bios->fp.xlated_entry + 7]));
        }
#ifdef __powerpc__
        /* Powerbook specific quirks */
        if (script == LVDS_RESET &&
            (dev->pci_device == 0x0179 || dev->pci_device == 0x0189 ||
             dev->pci_device == 0x0329))
                nv_write_tmds(dev, dcbent->or, 0, 0x02, 0x72);
#endif

        return 0;
}

static int run_lvds_table(struct drm_device *dev, struct dcb_entry *dcbent, int head, enum LVDS_script script, int pxclk)
{
        /*
         * The BIT LVDS table's header has the information to setup the
         * necessary registers. Following the standard 4 byte header are:
         * A bitmask byte and a dual-link transition pxclk value for use in
         * selecting the init script when not using straps; 4 script pointers
         * for panel power, selected by output and on/off; and 8 table pointers
         * for panel init, the needed one determined by output, and bits in the
         * conf byte. These tables are similar to the TMDS tables, consisting
         * of a list of pxclks and script pointers.
         */
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        unsigned int outputset = (dcbent->or == 4) ? 1 : 0;
        uint16_t scriptptr = 0, clktable;

        /*
         * For now we assume version 3.0 table - g80 support will need some
         * changes
         */

        switch (script) {
        case LVDS_INIT:
                return -ENOSYS;
        case LVDS_BACKLIGHT_ON:
        case LVDS_PANEL_ON:
                scriptptr = ROM16(bios->data[bios->fp.lvdsmanufacturerpointer + 7 + outputset * 2]);
                break;
        case LVDS_BACKLIGHT_OFF:
        case LVDS_PANEL_OFF:
                scriptptr = ROM16(bios->data[bios->fp.lvdsmanufacturerpointer + 11 + outputset * 2]);
                break;
        case LVDS_RESET:
                clktable = bios->fp.lvdsmanufacturerpointer + 15;
                if (dcbent->or == 4)
                        clktable += 8;

                if (dcbent->lvdsconf.use_straps_for_mode) {
                        if (bios->fp.dual_link)
                                clktable += 4;
                        if (bios->fp.if_is_24bit)
                                clktable += 2;
                } else {
                        /* using EDID */
                        int cmpval_24bit = (dcbent->or == 4) ? 4 : 1;

                        if (bios->fp.dual_link) {
                                clktable += 4;
                                cmpval_24bit <<= 1;
                        }

                        if (bios->fp.strapless_is_24bit & cmpval_24bit)
                                clktable += 2;
                }

                clktable = ROM16(bios->data[clktable]);
                if (!clktable) {
                        NV_ERROR(dev, "Pixel clock comparison table not found\n");
                        return -ENOENT;
                }
                scriptptr = clkcmptable(bios, clktable, pxclk);
        }

        if (!scriptptr) {
                NV_ERROR(dev, "LVDS output init script not found\n");
                return -ENOENT;
        }
        run_digital_op_script(dev, scriptptr, dcbent, head, bios->fp.dual_link);

        return 0;
}

int call_lvds_script(struct drm_device *dev, struct dcb_entry *dcbent, int head, enum LVDS_script script, int pxclk)
{
        /*
         * LVDS operations are multiplexed in an effort to present a single API
         * which works with two vastly differing underlying structures.
         * This acts as the demux
         */

        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        uint8_t lvds_ver = bios->data[bios->fp.lvdsmanufacturerpointer];
        uint32_t sel_clk_binding, sel_clk;
        int ret;

        if (bios->fp.last_script_invoc == (script << 1 | head) || !lvds_ver ||
            (lvds_ver >= 0x30 && script == LVDS_INIT))
                return 0;

        if (!bios->fp.lvds_init_run) {
                bios->fp.lvds_init_run = true;
                call_lvds_script(dev, dcbent, head, LVDS_INIT, pxclk);
        }

        if (script == LVDS_PANEL_ON && bios->fp.reset_after_pclk_change)
                call_lvds_script(dev, dcbent, head, LVDS_RESET, pxclk);
        if (script == LVDS_RESET && bios->fp.power_off_for_reset)
                call_lvds_script(dev, dcbent, head, LVDS_PANEL_OFF, pxclk);

        NV_TRACE(dev, "Calling LVDS script %d:\n", script);

        /* don't let script change pll->head binding */
        sel_clk_binding = bios_rd32(bios, NV_PRAMDAC_SEL_CLK) & 0x50000;

        if (lvds_ver < 0x30)
                ret = call_lvds_manufacturer_script(dev, dcbent, head, script);
        else
                ret = run_lvds_table(dev, dcbent, head, script, pxclk);

        bios->fp.last_script_invoc = (script << 1 | head);

        sel_clk = NVReadRAMDAC(dev, 0, NV_PRAMDAC_SEL_CLK) & ~0x50000;
        NVWriteRAMDAC(dev, 0, NV_PRAMDAC_SEL_CLK, sel_clk | sel_clk_binding);
        /* some scripts set a value in NV_PBUS_POWERCTRL_2 and break video overlay */
        nvWriteMC(dev, NV_PBUS_POWERCTRL_2, 0);

        return ret;
}

struct lvdstableheader {
        uint8_t lvds_ver, headerlen, recordlen;
};

static int parse_lvds_manufacturer_table_header(struct drm_device *dev, struct nvbios *bios, struct lvdstableheader *lth)
{
        /*
         * BMP version (0xa) LVDS table has a simple header of version and
         * record length. The BIT LVDS table has the typical BIT table header:
         * version byte, header length byte, record length byte, and a byte for
         * the maximum number of records that can be held in the table.
         */

        uint8_t lvds_ver, headerlen, recordlen;

        memset(lth, 0, sizeof(struct lvdstableheader));

        if (bios->fp.lvdsmanufacturerpointer == 0x0) {
                NV_ERROR(dev, "Pointer to LVDS manufacturer table invalid\n");
                return -EINVAL;
        }

        lvds_ver = bios->data[bios->fp.lvdsmanufacturerpointer];

        switch (lvds_ver) {
        case 0x0a:      /* pre NV40 */
                headerlen = 2;
                recordlen = bios->data[bios->fp.lvdsmanufacturerpointer + 1];
                break;
        case 0x30:      /* NV4x */
                headerlen = bios->data[bios->fp.lvdsmanufacturerpointer + 1];
                if (headerlen < 0x1f) {
                        NV_ERROR(dev, "LVDS table header not understood\n");
                        return -EINVAL;
                }
                recordlen = bios->data[bios->fp.lvdsmanufacturerpointer + 2];
                break;
        case 0x40:      /* G80/G90 */
                headerlen = bios->data[bios->fp.lvdsmanufacturerpointer + 1];
                if (headerlen < 0x7) {
                        NV_ERROR(dev, "LVDS table header not understood\n");
                        return -EINVAL;
                }
                recordlen = bios->data[bios->fp.lvdsmanufacturerpointer + 2];
                break;
        default:
                NV_ERROR(dev,
                         "LVDS table revision %d.%d not currently supported\n",
                         lvds_ver >> 4, lvds_ver & 0xf);
                return -ENOSYS;
        }

        lth->lvds_ver = lvds_ver;
        lth->headerlen = headerlen;
        lth->recordlen = recordlen;

        return 0;
}

static int
get_fp_strap(struct drm_device *dev, struct nvbios *bios)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;

        /*
         * The fp strap is normally dictated by the "User Strap" in
         * PEXTDEV_BOOT_0[20:16], but on BMP cards when bit 2 of the
         * Internal_Flags struct at 0x48 is set, the user strap gets overriden
         * by the PCI subsystem ID during POST, but not before the previous user
         * strap has been committed to CR58 for CR57=0xf on head A, which may be
         * read and used instead
         */

        if (bios->major_version < 5 && bios->data[0x48] & 0x4)
                return NVReadVgaCrtc5758(dev, 0, 0xf) & 0xf;

        if (dev_priv->card_type >= NV_50)
                return (bios_rd32(bios, NV_PEXTDEV_BOOT_0) >> 24) & 0xf;
        else
                return (bios_rd32(bios, NV_PEXTDEV_BOOT_0) >> 16) & 0xf;
}

static int parse_fp_mode_table(struct drm_device *dev, struct nvbios *bios)
{
        uint8_t *fptable;
        uint8_t fptable_ver, headerlen = 0, recordlen, fpentries = 0xf, fpindex;
        int ret, ofs, fpstrapping;
        struct lvdstableheader lth;

        if (bios->fp.fptablepointer == 0x0) {
                /* Apple cards don't have the fp table; the laptops use DDC */
                /* The table is also missing on some x86 IGPs */
#ifndef __powerpc__
                NV_ERROR(dev, "Pointer to flat panel table invalid\n");
#endif
                bios->digital_min_front_porch = 0x4b;
                return 0;
        }

        fptable = &bios->data[bios->fp.fptablepointer];
        fptable_ver = fptable[0];

        switch (fptable_ver) {
        /*
         * BMP version 0x5.0x11 BIOSen have version 1 like tables, but no
         * version field, and miss one of the spread spectrum/PWM bytes.
         * This could affect early GF2Go parts (not seen any appropriate ROMs
         * though). Here we assume that a version of 0x05 matches this case
         * (combining with a BMP version check would be better), as the
         * common case for the panel type field is 0x0005, and that is in
         * fact what we are reading the first byte of.
         */
        case 0x05:      /* some NV10, 11, 15, 16 */
                recordlen = 42;
                ofs = -1;
                break;
        case 0x10:      /* some NV15/16, and NV11+ */
                recordlen = 44;
                ofs = 0;
                break;
        case 0x20:      /* NV40+ */
                headerlen = fptable[1];
                recordlen = fptable[2];
                fpentries = fptable[3];
                /*
                 * fptable[4] is the minimum
                 * RAMDAC_FP_HCRTC -> RAMDAC_FP_HSYNC_START gap
                 */
                bios->digital_min_front_porch = fptable[4];
                ofs = -7;
                break;
        default:
                NV_ERROR(dev,
                         "FP table revision %d.%d not currently supported\n",
                         fptable_ver >> 4, fptable_ver & 0xf);
                return -ENOSYS;
        }

        if (!bios->is_mobile) /* !mobile only needs digital_min_front_porch */
                return 0;

        ret = parse_lvds_manufacturer_table_header(dev, bios, &lth);
        if (ret)
                return ret;

        if (lth.lvds_ver == 0x30 || lth.lvds_ver == 0x40) {
                bios->fp.fpxlatetableptr = bios->fp.lvdsmanufacturerpointer +
                                                        lth.headerlen + 1;
                bios->fp.xlatwidth = lth.recordlen;
        }
        if (bios->fp.fpxlatetableptr == 0x0) {
                NV_ERROR(dev, "Pointer to flat panel xlat table invalid\n");
                return -EINVAL;
        }

        fpstrapping = get_fp_strap(dev, bios);

        fpindex = bios->data[bios->fp.fpxlatetableptr +
                                        fpstrapping * bios->fp.xlatwidth];

        if (fpindex > fpentries) {
                NV_ERROR(dev, "Bad flat panel table index\n");
                return -ENOENT;
        }

        /* nv4x cards need both a strap value and fpindex of 0xf to use DDC */
        if (lth.lvds_ver > 0x10)
                bios->fp_no_ddc = fpstrapping != 0xf || fpindex != 0xf;

        /*
         * If either the strap or xlated fpindex value are 0xf there is no
         * panel using a strap-derived bios mode present.  this condition
         * includes, but is different from, the DDC panel indicator above
         */
        if (fpstrapping == 0xf || fpindex == 0xf)
                return 0;

        bios->fp.mode_ptr = bios->fp.fptablepointer + headerlen +
                            recordlen * fpindex + ofs;

        NV_TRACE(dev, "BIOS FP mode: %dx%d (%dkHz pixel clock)\n",
                 ROM16(bios->data[bios->fp.mode_ptr + 11]) + 1,
                 ROM16(bios->data[bios->fp.mode_ptr + 25]) + 1,
                 ROM16(bios->data[bios->fp.mode_ptr + 7]) * 10);

        return 0;
}

bool nouveau_bios_fp_mode(struct drm_device *dev, struct drm_display_mode *mode)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        uint8_t *mode_entry = &bios->data[bios->fp.mode_ptr];

        if (!mode)      /* just checking whether we can produce a mode */
                return bios->fp.mode_ptr;

        memset(mode, 0, sizeof(struct drm_display_mode));
        /*
         * For version 1.0 (version in byte 0):
         * bytes 1-2 are "panel type", including bits on whether Colour/mono,
         * single/dual link, and type (TFT etc.)
         * bytes 3-6 are bits per colour in RGBX
         */
        mode->clock = ROM16(mode_entry[7]) * 10;
        /* bytes 9-10 is HActive */
        mode->hdisplay = ROM16(mode_entry[11]) + 1;
        /*
         * bytes 13-14 is HValid Start
         * bytes 15-16 is HValid End
         */
        mode->hsync_start = ROM16(mode_entry[17]) + 1;
        mode->hsync_end = ROM16(mode_entry[19]) + 1;
        mode->htotal = ROM16(mode_entry[21]) + 1;
        /* bytes 23-24, 27-30 similarly, but vertical */
        mode->vdisplay = ROM16(mode_entry[25]) + 1;
        mode->vsync_start = ROM16(mode_entry[31]) + 1;
        mode->vsync_end = ROM16(mode_entry[33]) + 1;
        mode->vtotal = ROM16(mode_entry[35]) + 1;
        mode->flags |= (mode_entry[37] & 0x10) ?
                        DRM_MODE_FLAG_PHSYNC : DRM_MODE_FLAG_NHSYNC;
        mode->flags |= (mode_entry[37] & 0x1) ?
                        DRM_MODE_FLAG_PVSYNC : DRM_MODE_FLAG_NVSYNC;
        /*
         * bytes 38-39 relate to spread spectrum settings
         * bytes 40-43 are something to do with PWM
         */

        mode->status = MODE_OK;
        mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
        drm_mode_set_name(mode);
        return bios->fp.mode_ptr;
}

int nouveau_bios_parse_lvds_table(struct drm_device *dev, int pxclk, bool *dl, bool *if_is_24bit)
{
        /*
         * The LVDS table header is (mostly) described in
         * parse_lvds_manufacturer_table_header(): the BIT header additionally
         * contains the dual-link transition pxclk (in 10s kHz), at byte 5 - if
         * straps are not being used for the panel, this specifies the frequency
         * at which modes should be set up in the dual link style.
         *
         * Following the header, the BMP (ver 0xa) table has several records,
         * indexed by a separate xlat table, indexed in turn by the fp strap in
         * EXTDEV_BOOT. Each record had a config byte, followed by 6 script
         * numbers for use by INIT_SUB which controlled panel init and power,
         * and finally a dword of ms to sleep between power off and on
         * operations.
         *
         * In the BIT versions, the table following the header serves as an
         * integrated config and xlat table: the records in the table are
         * indexed by the FP strap nibble in EXTDEV_BOOT, and each record has
         * two bytes - the first as a config byte, the second for indexing the
         * fp mode table pointed to by the BIT 'D' table
         *
         * DDC is not used until after card init, so selecting the correct table
         * entry and setting the dual link flag for EDID equipped panels,
         * requiring tests against the native-mode pixel clock, cannot be done
         * until later, when this function should be called with non-zero pxclk
         */
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        int fpstrapping = get_fp_strap(dev, bios), lvdsmanufacturerindex = 0;
        struct lvdstableheader lth;
        uint16_t lvdsofs;
        int ret, chip_version = bios->chip_version;

        ret = parse_lvds_manufacturer_table_header(dev, bios, &lth);
        if (ret)
                return ret;

        switch (lth.lvds_ver) {
        case 0x0a:      /* pre NV40 */
                lvdsmanufacturerindex = bios->data[
                                        bios->fp.fpxlatemanufacturertableptr +
                                        fpstrapping];

                /* we're done if this isn't the EDID panel case */
                if (!pxclk)
                        break;

                if (chip_version < 0x25) {
                        /* nv17 behaviour
                         *
                         * It seems the old style lvds script pointer is reused
                         * to select 18/24 bit colour depth for EDID panels.
                         */
                        lvdsmanufacturerindex =
                                (bios->legacy.lvds_single_a_script_ptr & 1) ?
                                                                        2 : 0;
                        if (pxclk >= bios->fp.duallink_transition_clk)
                                lvdsmanufacturerindex++;
                } else if (chip_version < 0x30) {
                        /* nv28 behaviour (off-chip encoder)
                         *
                         * nv28 does a complex dance of first using byte 121 of
                         * the EDID to choose the lvdsmanufacturerindex, then
                         * later attempting to match the EDID manufacturer and
                         * product IDs in a table (signature 'pidt' (panel id
                         * table?)), setting an lvdsmanufacturerindex of 0 and
                         * an fp strap of the match index (or 0xf if none)
                         */
                        lvdsmanufacturerindex = 0;
                } else {
                        /* nv31, nv34 behaviour */
                        lvdsmanufacturerindex = 0;
                        if (pxclk >= bios->fp.duallink_transition_clk)
                                lvdsmanufacturerindex = 2;
                        if (pxclk >= 140000)
                                lvdsmanufacturerindex = 3;
                }

                /*
                 * nvidia set the high nibble of (cr57=f, cr58) to
                 * lvdsmanufacturerindex in this case; we don't
                 */
                break;
        case 0x30:      /* NV4x */
        case 0x40:      /* G80/G90 */
                lvdsmanufacturerindex = fpstrapping;
                break;
        default:
                NV_ERROR(dev, "LVDS table revision not currently supported\n");
                return -ENOSYS;
        }

        lvdsofs = bios->fp.xlated_entry = bios->fp.lvdsmanufacturerpointer + lth.headerlen + lth.recordlen * lvdsmanufacturerindex;
        switch (lth.lvds_ver) {
        case 0x0a:
                bios->fp.power_off_for_reset = bios->data[lvdsofs] & 1;
                bios->fp.reset_after_pclk_change = bios->data[lvdsofs] & 2;
                bios->fp.dual_link = bios->data[lvdsofs] & 4;
                bios->fp.link_c_increment = bios->data[lvdsofs] & 8;
                *if_is_24bit = bios->data[lvdsofs] & 16;
                break;
        case 0x30:
        case 0x40:
                /*
                 * No sign of the "power off for reset" or "reset for panel
                 * on" bits, but it's safer to assume we should
                 */
                bios->fp.power_off_for_reset = true;
                bios->fp.reset_after_pclk_change = true;

                /*
                 * It's ok lvdsofs is wrong for nv4x edid case; dual_link is
                 * over-written, and if_is_24bit isn't used
                 */
                bios->fp.dual_link = bios->data[lvdsofs] & 1;
                bios->fp.if_is_24bit = bios->data[lvdsofs] & 2;
                bios->fp.strapless_is_24bit = bios->data[bios->fp.lvdsmanufacturerpointer + 4];
                bios->fp.duallink_transition_clk = ROM16(bios->data[bios->fp.lvdsmanufacturerpointer + 5]) * 10;
                break;
        }

        /* Dell Latitude D620 reports a too-high value for the dual-link
         * transition freq, causing us to program the panel incorrectly.
         *
         * It doesn't appear the VBIOS actually uses its transition freq
         * (90000kHz), instead it uses the "Number of LVDS channels" field
         * out of the panel ID structure (http://www.spwg.org/).
         *
         * For the moment, a quirk will do :)
         */
        if (nv_match_device(dev, 0x01d7, 0x1028, 0x01c2))
                bios->fp.duallink_transition_clk = 80000;

        /* set dual_link flag for EDID case */
        if (pxclk && (chip_version < 0x25 || chip_version > 0x28))
                bios->fp.dual_link = (pxclk >= bios->fp.duallink_transition_clk);

        *dl = bios->fp.dual_link;

        return 0;
}

static uint8_t *
bios_output_config_match(struct drm_device *dev, struct dcb_entry *dcbent,
                         uint16_t record, int record_len, int record_nr,
                         bool match_link)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        uint32_t entry;
        uint16_t table;
        int i, v;

        switch (dcbent->type) {
        case OUTPUT_TMDS:
        case OUTPUT_LVDS:
        case OUTPUT_DP:
                break;
        default:
                match_link = false;
                break;
        }

        for (i = 0; i < record_nr; i++, record += record_len) {
                table = ROM16(bios->data[record]);
                if (!table)
                        continue;
                entry = ROM32(bios->data[table]);

                if (match_link) {
                        v = (entry & 0x00c00000) >> 22;
                        if (!(v & dcbent->sorconf.link))
                                continue;
                }

                v = (entry & 0x000f0000) >> 16;
                if (!(v & dcbent->or))
                        continue;

                v = (entry & 0x000000f0) >> 4;
                if (v != dcbent->location)
                        continue;

                v = (entry & 0x0000000f);
                if (v != dcbent->type)
                        continue;

                return &bios->data[table];
        }

        return NULL;
}

void *
nouveau_bios_dp_table(struct drm_device *dev, struct dcb_entry *dcbent,
                      int *length)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        uint8_t *table;

        if (!bios->display.dp_table_ptr) {
                NV_ERROR(dev, "No pointer to DisplayPort table\n");
                return NULL;
        }
        table = &bios->data[bios->display.dp_table_ptr];

        if (table[0] != 0x20 && table[0] != 0x21) {
                NV_ERROR(dev, "DisplayPort table version 0x%02x unknown\n",
                         table[0]);
                return NULL;
        }

        *length = table[4];
        return bios_output_config_match(dev, dcbent,
                                        bios->display.dp_table_ptr + table[1],
                                        table[2], table[3], table[0] >= 0x21);
}

int
nouveau_bios_run_display_table(struct drm_device *dev, struct dcb_entry *dcbent,
                               uint32_t sub, int pxclk)
{
        /*
         * The display script table is located by the BIT 'U' table.
         *
         * It contains an array of pointers to various tables describing
         * a particular output type.  The first 32-bits of the output
         * tables contains similar information to a DCB entry, and is
         * used to decide whether that particular table is suitable for
         * the output you want to access.
         *
         * The "record header length" field here seems to indicate the
         * offset of the first configuration entry in the output tables.
         * This is 10 on most cards I've seen, but 12 has been witnessed
         * on DP cards, and there's another script pointer within the
         * header.
         *
         * offset + 0   ( 8 bits): version
         * offset + 1   ( 8 bits): header length
         * offset + 2   ( 8 bits): record length
         * offset + 3   ( 8 bits): number of records
         * offset + 4   ( 8 bits): record header length
         * offset + 5   (16 bits): pointer to first output script table
         */

        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        uint8_t *table = &bios->data[bios->display.script_table_ptr];
        uint8_t *otable = NULL;
        uint16_t script;
        int i = 0;

        if (!bios->display.script_table_ptr) {
                NV_ERROR(dev, "No pointer to output script table\n");
                return 1;
        }

        /*
         * Nothing useful has been in any of the pre-2.0 tables I've seen,
         * so until they are, we really don't need to care.
         */
        if (table[0] < 0x20)
                return 1;

        if (table[0] != 0x20 && table[0] != 0x21) {
                NV_ERROR(dev, "Output script table version 0x%02x unknown\n",
                         table[0]);
                return 1;
        }

        /*
         * The output script tables describing a particular output type
         * look as follows:
         *
         * offset + 0   (32 bits): output this table matches (hash of DCB)
         * offset + 4   ( 8 bits): unknown
         * offset + 5   ( 8 bits): number of configurations
         * offset + 6   (16 bits): pointer to some script
         * offset + 8   (16 bits): pointer to some script
         *
         * headerlen == 10
         * offset + 10           : configuration 0
         *
         * headerlen == 12
         * offset + 10           : pointer to some script
         * offset + 12           : configuration 0
         *
         * Each config entry is as follows:
         *
         * offset + 0   (16 bits): unknown, assumed to be a match value
         * offset + 2   (16 bits): pointer to script table (clock set?)
         * offset + 4   (16 bits): pointer to script table (reset?)
         *
         * There doesn't appear to be a count value to say how many
         * entries exist in each script table, instead, a 0 value in
         * the first 16-bit word seems to indicate both the end of the
         * list and the default entry.  The second 16-bit word in the
         * script tables is a pointer to the script to execute.
         */

        NV_DEBUG_KMS(dev, "Searching for output entry for %d %d %d\n",
                        dcbent->type, dcbent->location, dcbent->or);
        otable = bios_output_config_match(dev, dcbent, table[1] +
                                          bios->display.script_table_ptr,
                                          table[2], table[3], table[0] >= 0x21);
        if (!otable) {
                NV_DEBUG_KMS(dev, "failed to match any output table\n");
                return 1;
        }

        if (pxclk < -2 || pxclk > 0) {
                /* Try to find matching script table entry */
                for (i = 0; i < otable[5]; i++) {
                        if (ROM16(otable[table[4] + i*6]) == sub)
                                break;
                }

                if (i == otable[5]) {
                        NV_ERROR(dev, "Table 0x%04x not found for %d/%d, "
                                      "using first\n",
                                 sub, dcbent->type, dcbent->or);
                        i = 0;
                }
        }

        if (pxclk == 0) {
                script = ROM16(otable[6]);
                if (!script) {
                        NV_DEBUG_KMS(dev, "output script 0 not found\n");
                        return 1;
                }

                NV_DEBUG_KMS(dev, "0x%04X: parsing output script 0\n", script);
                nouveau_bios_run_init_table(dev, script, dcbent);
        } else
        if (pxclk == -1) {
                script = ROM16(otable[8]);
                if (!script) {
                        NV_DEBUG_KMS(dev, "output script 1 not found\n");
                        return 1;
                }

                NV_DEBUG_KMS(dev, "0x%04X: parsing output script 1\n", script);
                nouveau_bios_run_init_table(dev, script, dcbent);
        } else
        if (pxclk == -2) {
                if (table[4] >= 12)
                        script = ROM16(otable[10]);
                else
                        script = 0;
                if (!script) {
                        NV_DEBUG_KMS(dev, "output script 2 not found\n");
                        return 1;
                }

                NV_DEBUG_KMS(dev, "0x%04X: parsing output script 2\n", script);
                nouveau_bios_run_init_table(dev, script, dcbent);
        } else
        if (pxclk > 0) {
                script = ROM16(otable[table[4] + i*6 + 2]);
                if (script)
                        script = clkcmptable(bios, script, pxclk);
                if (!script) {
                        NV_DEBUG_KMS(dev, "clock script 0 not found\n");
                        return 1;
                }

                NV_DEBUG_KMS(dev, "0x%04X: parsing clock script 0\n", script);
                nouveau_bios_run_init_table(dev, script, dcbent);
        } else
        if (pxclk < 0) {
                script = ROM16(otable[table[4] + i*6 + 4]);
                if (script)
                        script = clkcmptable(bios, script, -pxclk);
                if (!script) {
                        NV_DEBUG_KMS(dev, "clock script 1 not found\n");
                        return 1;
                }

                NV_DEBUG_KMS(dev, "0x%04X: parsing clock script 1\n", script);
                nouveau_bios_run_init_table(dev, script, dcbent);
        }

        return 0;
}


int run_tmds_table(struct drm_device *dev, struct dcb_entry *dcbent, int head, int pxclk)
{
        /*
         * the pxclk parameter is in kHz
         *
         * This runs the TMDS regs setting code found on BIT bios cards
         *
         * For ffs(or) == 1 use the first table, for ffs(or) == 2 and
         * ffs(or) == 3, use the second.
         */

        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        int cv = bios->chip_version;
        uint16_t clktable = 0, scriptptr;
        uint32_t sel_clk_binding, sel_clk;

        /* pre-nv17 off-chip tmds uses scripts, post nv17 doesn't */
        if (cv >= 0x17 && cv != 0x1a && cv != 0x20 &&
            dcbent->location != DCB_LOC_ON_CHIP)
                return 0;

        switch (ffs(dcbent->or)) {
        case 1:
                clktable = bios->tmds.output0_script_ptr;
                break;
        case 2:
        case 3:
                clktable = bios->tmds.output1_script_ptr;
                break;
        }

        if (!clktable) {
                NV_ERROR(dev, "Pixel clock comparison table not found\n");
                return -EINVAL;
        }

        scriptptr = clkcmptable(bios, clktable, pxclk);

        if (!scriptptr) {
                NV_ERROR(dev, "TMDS output init script not found\n");
                return -ENOENT;
        }

        /* don't let script change pll->head binding */
        sel_clk_binding = bios_rd32(bios, NV_PRAMDAC_SEL_CLK) & 0x50000;
        run_digital_op_script(dev, scriptptr, dcbent, head, pxclk >= 165000);
        sel_clk = NVReadRAMDAC(dev, 0, NV_PRAMDAC_SEL_CLK) & ~0x50000;
        NVWriteRAMDAC(dev, 0, NV_PRAMDAC_SEL_CLK, sel_clk | sel_clk_binding);

        return 0;
}

struct pll_mapping {
        u8  type;
        u32 reg;
};

static struct pll_mapping nv04_pll_mapping[] = {
        { PLL_CORE  , NV_PRAMDAC_NVPLL_COEFF },
        { PLL_MEMORY, NV_PRAMDAC_MPLL_COEFF },
        { PLL_VPLL0 , NV_PRAMDAC_VPLL_COEFF },
        { PLL_VPLL1 , NV_RAMDAC_VPLL2 },
        {}
};

static struct pll_mapping nv40_pll_mapping[] = {
        { PLL_CORE  , 0x004000 },
        { PLL_MEMORY, 0x004020 },
        { PLL_VPLL0 , NV_PRAMDAC_VPLL_COEFF },
        { PLL_VPLL1 , NV_RAMDAC_VPLL2 },
        {}
};

static struct pll_mapping nv50_pll_mapping[] = {
        { PLL_CORE  , 0x004028 },
        { PLL_SHADER, 0x004020 },
        { PLL_UNK03 , 0x004000 },
        { PLL_MEMORY, 0x004008 },
        { PLL_UNK40 , 0x00e810 },
        { PLL_UNK41 , 0x00e818 },
        { PLL_UNK42 , 0x00e824 },
        { PLL_VPLL0 , 0x614100 },
        { PLL_VPLL1 , 0x614900 },
        {}
};

static struct pll_mapping nv84_pll_mapping[] = {
        { PLL_CORE  , 0x004028 },
        { PLL_SHADER, 0x004020 },
        { PLL_MEMORY, 0x004008 },
        { PLL_UNK05 , 0x004030 },
        { PLL_UNK41 , 0x00e818 },
        { PLL_VPLL0 , 0x614100 },
        { PLL_VPLL1 , 0x614900 },
        {}
};

u32
get_pll_register(struct drm_device *dev, enum pll_types type)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        struct pll_mapping *map;
        int i;

        if (dev_priv->card_type < NV_40)
                map = nv04_pll_mapping;
        else
        if (dev_priv->card_type < NV_50)
                map = nv40_pll_mapping;
        else {
                u8 *plim = &bios->data[bios->pll_limit_tbl_ptr];

                if (plim[0] >= 0x30) {
                        u8 *entry = plim + plim[1];
                        for (i = 0; i < plim[3]; i++, entry += plim[2]) {
                                if (entry[0] == type)
                                        return ROM32(entry[3]);
                        }

                        return 0;
                }

                if (dev_priv->chipset == 0x50)
                        map = nv50_pll_mapping;
                else
                        map = nv84_pll_mapping;
        }

        while (map->reg) {
                if (map->type == type)
                        return map->reg;
                map++;
        }

        return 0;
}

int get_pll_limits(struct drm_device *dev, uint32_t limit_match, struct pll_lims *pll_lim)
{
        /*
         * PLL limits table
         *
         * Version 0x10: NV30, NV31
         * One byte header (version), one record of 24 bytes
         * Version 0x11: NV36 - Not implemented
         * Seems to have same record style as 0x10, but 3 records rather than 1
         * Version 0x20: Found on Geforce 6 cards
         * Trivial 4 byte BIT header. 31 (0x1f) byte record length
         * Version 0x21: Found on Geforce 7, 8 and some Geforce 6 cards
         * 5 byte header, fifth byte of unknown purpose. 35 (0x23) byte record
         * length in general, some (integrated) have an extra configuration byte
         * Version 0x30: Found on Geforce 8, separates the register mapping
         * from the limits tables.
         */

        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        int cv = bios->chip_version, pllindex = 0;
        uint8_t pll_lim_ver = 0, headerlen = 0, recordlen = 0, entries = 0;
        uint32_t crystal_strap_mask, crystal_straps;

        if (!bios->pll_limit_tbl_ptr) {
                if (cv == 0x30 || cv == 0x31 || cv == 0x35 || cv == 0x36 ||
                    cv >= 0x40) {
                        NV_ERROR(dev, "Pointer to PLL limits table invalid\n");
                        return -EINVAL;
                }
        } else
                pll_lim_ver = bios->data[bios->pll_limit_tbl_ptr];

        crystal_strap_mask = 1 << 6;
        /* open coded dev->twoHeads test */
        if (cv > 0x10 && cv != 0x15 && cv != 0x1a && cv != 0x20)
                crystal_strap_mask |= 1 << 22;
        crystal_straps = nvReadEXTDEV(dev, NV_PEXTDEV_BOOT_0) &
                                                        crystal_strap_mask;

        switch (pll_lim_ver) {
        /*
         * We use version 0 to indicate a pre limit table bios (single stage
         * pll) and load the hard coded limits instead.
         */
        case 0:
                break;
        case 0x10:
        case 0x11:
                /*
                 * Strictly v0x11 has 3 entries, but the last two don't seem
                 * to get used.
                 */
                headerlen = 1;
                recordlen = 0x18;
                entries = 1;
                pllindex = 0;
                break;
        case 0x20:
        case 0x21:
        case 0x30:
        case 0x40:
                headerlen = bios->data[bios->pll_limit_tbl_ptr + 1];
                recordlen = bios->data[bios->pll_limit_tbl_ptr + 2];
                entries = bios->data[bios->pll_limit_tbl_ptr + 3];
                break;
        default:
                NV_ERROR(dev, "PLL limits table revision 0x%X not currently "
                                "supported\n", pll_lim_ver);
                return -ENOSYS;
        }

        /* initialize all members to zero */
        memset(pll_lim, 0, sizeof(struct pll_lims));

        /* if we were passed a type rather than a register, figure
         * out the register and store it
         */
        if (limit_match > PLL_MAX)
                pll_lim->reg = limit_match;
        else {
                pll_lim->reg = get_pll_register(dev, limit_match);
                if (!pll_lim->reg)
                        return -ENOENT;
        }

        if (pll_lim_ver == 0x10 || pll_lim_ver == 0x11) {
                uint8_t *pll_rec = &bios->data[bios->pll_limit_tbl_ptr + headerlen + recordlen * pllindex];

                pll_lim->vco1.minfreq = ROM32(pll_rec[0]);
                pll_lim->vco1.maxfreq = ROM32(pll_rec[4]);
                pll_lim->vco2.minfreq = ROM32(pll_rec[8]);
                pll_lim->vco2.maxfreq = ROM32(pll_rec[12]);
                pll_lim->vco1.min_inputfreq = ROM32(pll_rec[16]);
                pll_lim->vco2.min_inputfreq = ROM32(pll_rec[20]);
                pll_lim->vco1.max_inputfreq = pll_lim->vco2.max_inputfreq = INT_MAX;

                /* these values taken from nv30/31/36 */
                pll_lim->vco1.min_n = 0x1;
                if (cv == 0x36)
                        pll_lim->vco1.min_n = 0x5;
                pll_lim->vco1.max_n = 0xff;
                pll_lim->vco1.min_m = 0x1;
                pll_lim->vco1.max_m = 0xd;
                pll_lim->vco2.min_n = 0x4;
                /*
                 * On nv30, 31, 36 (i.e. all cards with two stage PLLs with this
                 * table version (apart from nv35)), N2 is compared to
                 * maxN2 (0x46) and 10 * maxM2 (0x4), so set maxN2 to 0x28 and
                 * save a comparison
                 */
                pll_lim->vco2.max_n = 0x28;
                if (cv == 0x30 || cv == 0x35)
                        /* only 5 bits available for N2 on nv30/35 */
                        pll_lim->vco2.max_n = 0x1f;
                pll_lim->vco2.min_m = 0x1;
                pll_lim->vco2.max_m = 0x4;
                pll_lim->max_log2p = 0x7;
                pll_lim->max_usable_log2p = 0x6;
        } else if (pll_lim_ver == 0x20 || pll_lim_ver == 0x21) {
                uint16_t plloffs = bios->pll_limit_tbl_ptr + headerlen;
                uint8_t *pll_rec;
                int i;

                /*
                 * First entry is default match, if nothing better. warn if
                 * reg field nonzero
                 */
                if (ROM32(bios->data[plloffs]))
                        NV_WARN(dev, "Default PLL limit entry has non-zero "
                                       "register field\n");

                for (i = 1; i < entries; i++)
                        if (ROM32(bios->data[plloffs + recordlen * i]) == pll_lim->reg) {
                                pllindex = i;
                                break;
                        }

                if ((dev_priv->card_type >= NV_50) && (pllindex == 0)) {
                        NV_ERROR(dev, "Register 0x%08x not found in PLL "
                                 "limits table", pll_lim->reg);
                        return -ENOENT;
                }

                pll_rec = &bios->data[plloffs + recordlen * pllindex];

                BIOSLOG(bios, "Loading PLL limits for reg 0x%08x\n",
                        pllindex ? pll_lim->reg : 0);

                /*
                 * Frequencies are stored in tables in MHz, kHz are more
                 * useful, so we convert.
                 */

                /* What output frequencies can each VCO generate? */
                pll_lim->vco1.minfreq = ROM16(pll_rec[4]) * 1000;
                pll_lim->vco1.maxfreq = ROM16(pll_rec[6]) * 1000;
                pll_lim->vco2.minfreq = ROM16(pll_rec[8]) * 1000;
                pll_lim->vco2.maxfreq = ROM16(pll_rec[10]) * 1000;

                /* What input frequencies they accept (past the m-divider)? */
                pll_lim->vco1.min_inputfreq = ROM16(pll_rec[12]) * 1000;
                pll_lim->vco2.min_inputfreq = ROM16(pll_rec[14]) * 1000;
                pll_lim->vco1.max_inputfreq = ROM16(pll_rec[16]) * 1000;
                pll_lim->vco2.max_inputfreq = ROM16(pll_rec[18]) * 1000;

                /* What values are accepted as multiplier and divider? */
                pll_lim->vco1.min_n = pll_rec[20];
                pll_lim->vco1.max_n = pll_rec[21];
                pll_lim->vco1.min_m = pll_rec[22];
                pll_lim->vco1.max_m = pll_rec[23];
                pll_lim->vco2.min_n = pll_rec[24];
                pll_lim->vco2.max_n = pll_rec[25];
                pll_lim->vco2.min_m = pll_rec[26];
                pll_lim->vco2.max_m = pll_rec[27];

                pll_lim->max_usable_log2p = pll_lim->max_log2p = pll_rec[29];
                if (pll_lim->max_log2p > 0x7)
                        /* pll decoding in nv_hw.c assumes never > 7 */
                        NV_WARN(dev, "Max log2 P value greater than 7 (%d)\n",
                                pll_lim->max_log2p);
                if (cv < 0x60)
                        pll_lim->max_usable_log2p = 0x6;
                pll_lim->log2p_bias = pll_rec[30];

                if (recordlen > 0x22)
                        pll_lim->refclk = ROM32(pll_rec[31]);

                if (recordlen > 0x23 && pll_rec[35])
                        NV_WARN(dev,
                                "Bits set in PLL configuration byte (%x)\n",
                                pll_rec[35]);

                /* C51 special not seen elsewhere */
                if (cv == 0x51 && !pll_lim->refclk) {
                        uint32_t sel_clk = bios_rd32(bios, NV_PRAMDAC_SEL_CLK);

                        if ((pll_lim->reg == NV_PRAMDAC_VPLL_COEFF && sel_clk & 0x20) ||
                            (pll_lim->reg == NV_RAMDAC_VPLL2 && sel_clk & 0x80)) {
                                if (bios_idxprt_rd(bios, NV_CIO_CRX__COLOR, NV_CIO_CRE_CHIP_ID_INDEX) < 0xa3)
                                        pll_lim->refclk = 200000;
                                else
                                        pll_lim->refclk = 25000;
                        }
                }
        } else if (pll_lim_ver == 0x30) { /* ver 0x30 */
                uint8_t *entry = &bios->data[bios->pll_limit_tbl_ptr + headerlen];
                uint8_t *record = NULL;
                int i;

                BIOSLOG(bios, "Loading PLL limits for register 0x%08x\n",
                        pll_lim->reg);

                for (i = 0; i < entries; i++, entry += recordlen) {
                        if (ROM32(entry[3]) == pll_lim->reg) {
                                record = &bios->data[ROM16(entry[1])];
                                break;
                        }
                }

                if (!record) {
                        NV_ERROR(dev, "Register 0x%08x not found in PLL "
                                 "limits table", pll_lim->reg);
                        return -ENOENT;
                }

                pll_lim->vco1.minfreq = ROM16(record[0]) * 1000;
                pll_lim->vco1.maxfreq = ROM16(record[2]) * 1000;
                pll_lim->vco2.minfreq = ROM16(record[4]) * 1000;
                pll_lim->vco2.maxfreq = ROM16(record[6]) * 1000;
                pll_lim->vco1.min_inputfreq = ROM16(record[8]) * 1000;
                pll_lim->vco2.min_inputfreq = ROM16(record[10]) * 1000;
                pll_lim->vco1.max_inputfreq = ROM16(record[12]) * 1000;
                pll_lim->vco2.max_inputfreq = ROM16(record[14]) * 1000;
                pll_lim->vco1.min_n = record[16];
                pll_lim->vco1.max_n = record[17];
                pll_lim->vco1.min_m = record[18];
                pll_lim->vco1.max_m = record[19];
                pll_lim->vco2.min_n = record[20];
                pll_lim->vco2.max_n = record[21];
                pll_lim->vco2.min_m = record[22];
                pll_lim->vco2.max_m = record[23];
                pll_lim->max_usable_log2p = pll_lim->max_log2p = record[25];
                pll_lim->log2p_bias = record[27];
                pll_lim->refclk = ROM32(record[28]);
        } else if (pll_lim_ver) { /* ver 0x40 */
                uint8_t *entry = &bios->data[bios->pll_limit_tbl_ptr + headerlen];
                uint8_t *record = NULL;
                int i;

                BIOSLOG(bios, "Loading PLL limits for register 0x%08x\n",
                        pll_lim->reg);

                for (i = 0; i < entries; i++, entry += recordlen) {
                        if (ROM32(entry[3]) == pll_lim->reg) {
                                record = &bios->data[ROM16(entry[1])];
                                break;
                        }
                }

                if (!record) {
                        NV_ERROR(dev, "Register 0x%08x not found in PLL "
                                 "limits table", pll_lim->reg);
                        return -ENOENT;
                }

                pll_lim->vco1.minfreq = ROM16(record[0]) * 1000;
                pll_lim->vco1.maxfreq = ROM16(record[2]) * 1000;
                pll_lim->vco1.min_inputfreq = ROM16(record[4]) * 1000;
                pll_lim->vco1.max_inputfreq = ROM16(record[6]) * 1000;
                pll_lim->vco1.min_m = record[8];
                pll_lim->vco1.max_m = record[9];
                pll_lim->vco1.min_n = record[10];
                pll_lim->vco1.max_n = record[11];
                pll_lim->min_p = record[12];
                pll_lim->max_p = record[13];
                pll_lim->refclk = ROM16(entry[9]) * 1000;
        }

        /*
         * By now any valid limit table ought to have set a max frequency for
         * vco1, so if it's zero it's either a pre limit table bios, or one
         * with an empty limit table (seen on nv18)
         */
        if (!pll_lim->vco1.maxfreq) {
                pll_lim->vco1.minfreq = bios->fminvco;
                pll_lim->vco1.maxfreq = bios->fmaxvco;
                pll_lim->vco1.min_inputfreq = 0;
                pll_lim->vco1.max_inputfreq = INT_MAX;
                pll_lim->vco1.min_n = 0x1;
                pll_lim->vco1.max_n = 0xff;
                pll_lim->vco1.min_m = 0x1;
                if (crystal_straps == 0) {
                        /* nv05 does this, nv11 doesn't, nv10 unknown */
                        if (cv < 0x11)
                                pll_lim->vco1.min_m = 0x7;
                        pll_lim->vco1.max_m = 0xd;
                } else {
                        if (cv < 0x11)
                                pll_lim->vco1.min_m = 0x8;
                        pll_lim->vco1.max_m = 0xe;
                }
                if (cv < 0x17 || cv == 0x1a || cv == 0x20)
                        pll_lim->max_log2p = 4;
                else
                        pll_lim->max_log2p = 5;
                pll_lim->max_usable_log2p = pll_lim->max_log2p;
        }

        if (!pll_lim->refclk)
                switch (crystal_straps) {
                case 0:
                        pll_lim->refclk = 13500;
                        break;
                case (1 << 6):
                        pll_lim->refclk = 14318;
                        break;
                case (1 << 22):
                        pll_lim->refclk = 27000;
                        break;
                case (1 << 22 | 1 << 6):
                        pll_lim->refclk = 25000;
                        break;
                }

        NV_DEBUG(dev, "pll.vco1.minfreq: %d\n", pll_lim->vco1.minfreq);
        NV_DEBUG(dev, "pll.vco1.maxfreq: %d\n", pll_lim->vco1.maxfreq);
        NV_DEBUG(dev, "pll.vco1.min_inputfreq: %d\n", pll_lim->vco1.min_inputfreq);
        NV_DEBUG(dev, "pll.vco1.max_inputfreq: %d\n", pll_lim->vco1.max_inputfreq);
        NV_DEBUG(dev, "pll.vco1.min_n: %d\n", pll_lim->vco1.min_n);
        NV_DEBUG(dev, "pll.vco1.max_n: %d\n", pll_lim->vco1.max_n);
        NV_DEBUG(dev, "pll.vco1.min_m: %d\n", pll_lim->vco1.min_m);
        NV_DEBUG(dev, "pll.vco1.max_m: %d\n", pll_lim->vco1.max_m);
        if (pll_lim->vco2.maxfreq) {
                NV_DEBUG(dev, "pll.vco2.minfreq: %d\n", pll_lim->vco2.minfreq);
                NV_DEBUG(dev, "pll.vco2.maxfreq: %d\n", pll_lim->vco2.maxfreq);
                NV_DEBUG(dev, "pll.vco2.min_inputfreq: %d\n", pll_lim->vco2.min_inputfreq);
                NV_DEBUG(dev, "pll.vco2.max_inputfreq: %d\n", pll_lim->vco2.max_inputfreq);
                NV_DEBUG(dev, "pll.vco2.min_n: %d\n", pll_lim->vco2.min_n);
                NV_DEBUG(dev, "pll.vco2.max_n: %d\n", pll_lim->vco2.max_n);
                NV_DEBUG(dev, "pll.vco2.min_m: %d\n", pll_lim->vco2.min_m);
                NV_DEBUG(dev, "pll.vco2.max_m: %d\n", pll_lim->vco2.max_m);
        }
        if (!pll_lim->max_p) {
                NV_DEBUG(dev, "pll.max_log2p: %d\n", pll_lim->max_log2p);
                NV_DEBUG(dev, "pll.log2p_bias: %d\n", pll_lim->log2p_bias);
        } else {
                NV_DEBUG(dev, "pll.min_p: %d\n", pll_lim->min_p);
                NV_DEBUG(dev, "pll.max_p: %d\n", pll_lim->max_p);
        }
        NV_DEBUG(dev, "pll.refclk: %d\n", pll_lim->refclk);

        return 0;
}

static void parse_bios_version(struct drm_device *dev, struct nvbios *bios, uint16_t offset)
{
        /*
         * offset + 0  (8 bits): Micro version
         * offset + 1  (8 bits): Minor version
         * offset + 2  (8 bits): Chip version
         * offset + 3  (8 bits): Major version
         */

        bios->major_version = bios->data[offset + 3];
        bios->chip_version = bios->data[offset + 2];
        NV_TRACE(dev, "Bios version %02x.%02x.%02x.%02x\n",
                 bios->data[offset + 3], bios->data[offset + 2],
                 bios->data[offset + 1], bios->data[offset]);
}

static void parse_script_table_pointers(struct nvbios *bios, uint16_t offset)
{
        /*
         * Parses the init table segment for pointers used in script execution.
         *
         * offset + 0  (16 bits): init script tables pointer
         * offset + 2  (16 bits): macro index table pointer
         * offset + 4  (16 bits): macro table pointer
         * offset + 6  (16 bits): condition table pointer
         * offset + 8  (16 bits): io condition table pointer
         * offset + 10 (16 bits): io flag condition table pointer
         * offset + 12 (16 bits): init function table pointer
         */

        bios->init_script_tbls_ptr = ROM16(bios->data[offset]);
        bios->macro_index_tbl_ptr = ROM16(bios->data[offset + 2]);
        bios->macro_tbl_ptr = ROM16(bios->data[offset + 4]);
        bios->condition_tbl_ptr = ROM16(bios->data[offset + 6]);
        bios->io_condition_tbl_ptr = ROM16(bios->data[offset + 8]);
        bios->io_flag_condition_tbl_ptr = ROM16(bios->data[offset + 10]);
        bios->init_function_tbl_ptr = ROM16(bios->data[offset + 12]);
}

static int parse_bit_A_tbl_entry(struct drm_device *dev, struct nvbios *bios, struct bit_entry *bitentry)
{
        /*
         * Parses the load detect values for g80 cards.
         *
         * offset + 0 (16 bits): loadval table pointer
         */

        uint16_t load_table_ptr;
        uint8_t version, headerlen, entrylen, num_entries;

        if (bitentry->length != 3) {
                NV_ERROR(dev, "Do not understand BIT A table\n");
                return -EINVAL;
        }

        load_table_ptr = ROM16(bios->data[bitentry->offset]);

        if (load_table_ptr == 0x0) {
                NV_DEBUG(dev, "Pointer to BIT loadval table invalid\n");
                return -EINVAL;
        }

        version = bios->data[load_table_ptr];

        if (version != 0x10) {
                NV_ERROR(dev, "BIT loadval table version %d.%d not supported\n",
                         version >> 4, version & 0xF);
                return -ENOSYS;
        }

        headerlen = bios->data[load_table_ptr + 1];
        entrylen = bios->data[load_table_ptr + 2];
        num_entries = bios->data[load_table_ptr + 3];

        if (headerlen != 4 || entrylen != 4 || num_entries != 2) {
                NV_ERROR(dev, "Do not understand BIT loadval table\n");
                return -EINVAL;
        }

        /* First entry is normal dac, 2nd tv-out perhaps? */
        bios->dactestval = ROM32(bios->data[load_table_ptr + headerlen]) & 0x3ff;

        return 0;
}

static int parse_bit_C_tbl_entry(struct drm_device *dev, struct nvbios *bios, struct bit_entry *bitentry)
{
        /*
         * offset + 8  (16 bits): PLL limits table pointer
         *
         * There's more in here, but that's unknown.
         */

        if (bitentry->length < 10) {
                NV_ERROR(dev, "Do not understand BIT C table\n");
                return -EINVAL;
        }

        bios->pll_limit_tbl_ptr = ROM16(bios->data[bitentry->offset + 8]);

        return 0;
}

static int parse_bit_display_tbl_entry(struct drm_device *dev, struct nvbios *bios, struct bit_entry *bitentry)
{
        /*
         * Parses the flat panel table segment that the bit entry points to.
         * Starting at bitentry->offset:
         *
         * offset + 0  (16 bits): ??? table pointer - seems to have 18 byte
         * records beginning with a freq.
         * offset + 2  (16 bits): mode table pointer
         */

        if (bitentry->length != 4) {
                NV_ERROR(dev, "Do not understand BIT display table\n");
                return -EINVAL;
        }

        bios->fp.fptablepointer = ROM16(bios->data[bitentry->offset + 2]);

        return 0;
}

static int parse_bit_init_tbl_entry(struct drm_device *dev, struct nvbios *bios, struct bit_entry *bitentry)
{
        /*
         * Parses the init table segment that the bit entry points to.
         *
         * See parse_script_table_pointers for layout
         */

        if (bitentry->length < 14) {
                NV_ERROR(dev, "Do not understand init table\n");
                return -EINVAL;
        }

        parse_script_table_pointers(bios, bitentry->offset);

        if (bitentry->length >= 16)
                bios->some_script_ptr = ROM16(bios->data[bitentry->offset + 14]);
        if (bitentry->length >= 18)
                bios->init96_tbl_ptr = ROM16(bios->data[bitentry->offset + 16]);

        return 0;
}

static int parse_bit_i_tbl_entry(struct drm_device *dev, struct nvbios *bios, struct bit_entry *bitentry)
{
        /*
         * BIT 'i' (info?) table
         *
         * offset + 0  (32 bits): BIOS version dword (as in B table)
         * offset + 5  (8  bits): BIOS feature byte (same as for BMP?)
         * offset + 13 (16 bits): pointer to table containing DAC load
         * detection comparison values
         *
         * There's other things in the table, purpose unknown
         */

        uint16_t daccmpoffset;
        uint8_t dacver, dacheaderlen;

        if (bitentry->length < 6) {
                NV_ERROR(dev, "BIT i table too short for needed information\n");
                return -EINVAL;
        }

        parse_bios_version(dev, bios, bitentry->offset);

        /*
         * bit 4 seems to indicate a mobile bios (doesn't suffer from BMP's
         * Quadro identity crisis), other bits possibly as for BMP feature byte
         */
        bios->feature_byte = bios->data[bitentry->offset + 5];
        bios->is_mobile = bios->feature_byte & FEATURE_MOBILE;

        if (bitentry->length < 15) {
                NV_WARN(dev, "BIT i table not long enough for DAC load "
                               "detection comparison table\n");
                return -EINVAL;
        }

        daccmpoffset = ROM16(bios->data[bitentry->offset + 13]);

        /* doesn't exist on g80 */
        if (!daccmpoffset)
                return 0;

        /*
         * The first value in the table, following the header, is the
         * comparison value, the second entry is a comparison value for
         * TV load detection.
         */

        dacver = bios->data[daccmpoffset];
        dacheaderlen = bios->data[daccmpoffset + 1];

        if (dacver != 0x00 && dacver != 0x10) {
                NV_WARN(dev, "DAC load detection comparison table version "
                               "%d.%d not known\n", dacver >> 4, dacver & 0xf);
                return -ENOSYS;
        }

        bios->dactestval = ROM32(bios->data[daccmpoffset + dacheaderlen]);
        bios->tvdactestval = ROM32(bios->data[daccmpoffset + dacheaderlen + 4]);

        return 0;
}

static int parse_bit_lvds_tbl_entry(struct drm_device *dev, struct nvbios *bios, struct bit_entry *bitentry)
{
        /*
         * Parses the LVDS table segment that the bit entry points to.
         * Starting at bitentry->offset:
         *
         * offset + 0  (16 bits): LVDS strap xlate table pointer
         */

        if (bitentry->length != 2) {
                NV_ERROR(dev, "Do not understand BIT LVDS table\n");
                return -EINVAL;
        }

        /*
         * No idea if it's still called the LVDS manufacturer table, but
         * the concept's close enough.
         */
        bios->fp.lvdsmanufacturerpointer = ROM16(bios->data[bitentry->offset]);

        return 0;
}

static int
parse_bit_M_tbl_entry(struct drm_device *dev, struct nvbios *bios,
                      struct bit_entry *bitentry)
{
        /*
         * offset + 2  (8  bits): number of options in an
         *      INIT_RAM_RESTRICT_ZM_REG_GROUP opcode option set
         * offset + 3  (16 bits): pointer to strap xlate table for RAM
         *      restrict option selection
         *
         * There's a bunch of bits in this table other than the RAM restrict
         * stuff that we don't use - their use currently unknown
         */

        /*
         * Older bios versions don't have a sufficiently long table for
         * what we want
         */
        if (bitentry->length < 0x5)
                return 0;

        if (bitentry->version < 2) {
                bios->ram_restrict_group_count = bios->data[bitentry->offset + 2];
                bios->ram_restrict_tbl_ptr = ROM16(bios->data[bitentry->offset + 3]);
        } else {
                bios->ram_restrict_group_count = bios->data[bitentry->offset + 0];
                bios->ram_restrict_tbl_ptr = ROM16(bios->data[bitentry->offset + 1]);
        }

        return 0;
}

static int parse_bit_tmds_tbl_entry(struct drm_device *dev, struct nvbios *bios, struct bit_entry *bitentry)
{
        /*
         * Parses the pointer to the TMDS table
         *
         * Starting at bitentry->offset:
         *
         * offset + 0  (16 bits): TMDS table pointer
         *
         * The TMDS table is typically found just before the DCB table, with a
         * characteristic signature of 0x11,0x13 (1.1 being version, 0x13 being
         * length?)
         *
         * At offset +7 is a pointer to a script, which I don't know how to
         * run yet.
         * At offset +9 is a pointer to another script, likewise
         * Offset +11 has a pointer to a table where the first word is a pxclk
         * frequency and the second word a pointer to a script, which should be
         * run if the comparison pxclk frequency is less than the pxclk desired.
         * This repeats for decreasing comparison frequencies
         * Offset +13 has a pointer to a similar table
         * The selection of table (and possibly +7/+9 script) is dictated by
         * "or" from the DCB.
         */

        uint16_t tmdstableptr, script1, script2;

        if (bitentry->length != 2) {
                NV_ERROR(dev, "Do not understand BIT TMDS table\n");
                return -EINVAL;
        }

        tmdstableptr = ROM16(bios->data[bitentry->offset]);
        if (!tmdstableptr) {
                NV_ERROR(dev, "Pointer to TMDS table invalid\n");
                return -EINVAL;
        }

        NV_INFO(dev, "TMDS table version %d.%d\n",
                bios->data[tmdstableptr] >> 4, bios->data[tmdstableptr] & 0xf);

        /* nv50+ has v2.0, but we don't parse it atm */
        if (bios->data[tmdstableptr] != 0x11)
                return -ENOSYS;

        /*
         * These two scripts are odd: they don't seem to get run even when
         * they are not stubbed.
         */
        script1 = ROM16(bios->data[tmdstableptr + 7]);
        script2 = ROM16(bios->data[tmdstableptr + 9]);
        if (bios->data[script1] != 'q' || bios->data[script2] != 'q')
                NV_WARN(dev, "TMDS table script pointers not stubbed\n");

        bios->tmds.output0_script_ptr = ROM16(bios->data[tmdstableptr + 11]);
        bios->tmds.output1_script_ptr = ROM16(bios->data[tmdstableptr + 13]);

        return 0;
}

static int
parse_bit_U_tbl_entry(struct drm_device *dev, struct nvbios *bios,
                      struct bit_entry *bitentry)
{
        /*
         * Parses the pointer to the G80 output script tables
         *
         * Starting at bitentry->offset:
         *
         * offset + 0  (16 bits): output script table pointer
         */

        uint16_t outputscripttableptr;

        if (bitentry->length != 3) {
                NV_ERROR(dev, "Do not understand BIT U table\n");
                return -EINVAL;
        }

        outputscripttableptr = ROM16(bios->data[bitentry->offset]);
        bios->display.script_table_ptr = outputscripttableptr;
        return 0;
}

static int
parse_bit_displayport_tbl_entry(struct drm_device *dev, struct nvbios *bios,
                                struct bit_entry *bitentry)
{
        bios->display.dp_table_ptr = ROM16(bios->data[bitentry->offset]);
        return 0;
}

struct bit_table {
        const char id;
        int (* const parse_fn)(struct drm_device *, struct nvbios *, struct bit_entry *);
};

#define BIT_TABLE(id, funcid) ((struct bit_table){ id, parse_bit_##funcid##_tbl_entry })

int
bit_table(struct drm_device *dev, u8 id, struct bit_entry *bit)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        u8 entries, *entry;

        entries = bios->data[bios->offset + 10];
        entry   = &bios->data[bios->offset + 12];
        while (entries--) {
                if (entry[0] == id) {
                        bit->id = entry[0];
                        bit->version = entry[1];
                        bit->length = ROM16(entry[2]);
                        bit->offset = ROM16(entry[4]);
                        bit->data = ROMPTR(bios, entry[4]);
                        return 0;
                }

                entry += bios->data[bios->offset + 9];
        }

        return -ENOENT;
}

static int
parse_bit_table(struct nvbios *bios, const uint16_t bitoffset,
                struct bit_table *table)
{
        struct drm_device *dev = bios->dev;
        struct bit_entry bitentry;

        if (bit_table(dev, table->id, &bitentry) == 0)
                return table->parse_fn(dev, bios, &bitentry);

        NV_INFO(dev, "BIT table '%c' not found\n", table->id);
        return -ENOSYS;
}

static int
parse_bit_structure(struct nvbios *bios, const uint16_t bitoffset)
{
        int ret;

        /*
         * The only restriction on parsing order currently is having 'i' first
         * for use of bios->*_version or bios->feature_byte while parsing;
         * functions shouldn't be actually *doing* anything apart from pulling
         * data from the image into the bios struct, thus no interdependencies
         */
        ret = parse_bit_table(bios, bitoffset, &BIT_TABLE('i', i));
        if (ret) /* info? */
                return ret;
        if (bios->major_version >= 0x60) /* g80+ */
                parse_bit_table(bios, bitoffset, &BIT_TABLE('A', A));
        ret = parse_bit_table(bios, bitoffset, &BIT_TABLE('C', C));
        if (ret)
                return ret;
        parse_bit_table(bios, bitoffset, &BIT_TABLE('D', display));
        ret = parse_bit_table(bios, bitoffset, &BIT_TABLE('I', init));
        if (ret)
                return ret;
        parse_bit_table(bios, bitoffset, &BIT_TABLE('M', M)); /* memory? */
        parse_bit_table(bios, bitoffset, &BIT_TABLE('L', lvds));
        parse_bit_table(bios, bitoffset, &BIT_TABLE('T', tmds));
        parse_bit_table(bios, bitoffset, &BIT_TABLE('U', U));
        parse_bit_table(bios, bitoffset, &BIT_TABLE('d', displayport));

        return 0;
}

static int parse_bmp_structure(struct drm_device *dev, struct nvbios *bios, unsigned int offset)
{
        /*
         * Parses the BMP structure for useful things, but does not act on them
         *
         * offset +   5: BMP major version
         * offset +   6: BMP minor version
         * offset +   9: BMP feature byte
         * offset +  10: BCD encoded BIOS version
         *
         * offset +  18: init script table pointer (for bios versions < 5.10h)
         * offset +  20: extra init script table pointer (for bios
         * versions < 5.10h)
         *
         * offset +  24: memory init table pointer (used on early bios versions)
         * offset +  26: SDR memory sequencing setup data table
         * offset +  28: DDR memory sequencing setup data table
         *
         * offset +  54: index of I2C CRTC pair to use for CRT output
         * offset +  55: index of I2C CRTC pair to use for TV output
         * offset +  56: index of I2C CRTC pair to use for flat panel output
         * offset +  58: write CRTC index for I2C pair 0
         * offset +  59: read CRTC index for I2C pair 0
         * offset +  60: write CRTC index for I2C pair 1
         * offset +  61: read CRTC index for I2C pair 1
         *
         * offset +  67: maximum internal PLL frequency (single stage PLL)
         * offset +  71: minimum internal PLL frequency (single stage PLL)
         *
         * offset +  75: script table pointers, as described in
         * parse_script_table_pointers
         *
         * offset +  89: TMDS single link output A table pointer
         * offset +  91: TMDS single link output B table pointer
         * offset +  95: LVDS single link output A table pointer
         * offset + 105: flat panel timings table pointer
         * offset + 107: flat panel strapping translation table pointer
         * offset + 117: LVDS manufacturer panel config table pointer
         * offset + 119: LVDS manufacturer strapping translation table pointer
         *
         * offset + 142: PLL limits table pointer
         *
         * offset + 156: minimum pixel clock for LVDS dual link
         */

        uint8_t *bmp = &bios->data[offset], bmp_version_major, bmp_version_minor;
        uint16_t bmplength;
        uint16_t legacy_scripts_offset, legacy_i2c_offset;

        /* load needed defaults in case we can't parse this info */
        bios->dcb.i2c[0].write = NV_CIO_CRE_DDC_WR__INDEX;
        bios->dcb.i2c[0].read = NV_CIO_CRE_DDC_STATUS__INDEX;
        bios->dcb.i2c[1].write = NV_CIO_CRE_DDC0_WR__INDEX;
        bios->dcb.i2c[1].read = NV_CIO_CRE_DDC0_STATUS__INDEX;
        bios->digital_min_front_porch = 0x4b;
        bios->fmaxvco = 256000;
        bios->fminvco = 128000;
        bios->fp.duallink_transition_clk = 90000;

        bmp_version_major = bmp[5];
        bmp_version_minor = bmp[6];

        NV_TRACE(dev, "BMP version %d.%d\n",
                 bmp_version_major, bmp_version_minor);

        /*
         * Make sure that 0x36 is blank and can't be mistaken for a DCB
         * pointer on early versions
         */
        if (bmp_version_major < 5)
                *(uint16_t *)&bios->data[0x36] = 0;

        /*
         * Seems that the minor version was 1 for all major versions prior
         * to 5. Version 6 could theoretically exist, but I suspect BIT
         * happened instead.
         */
        if ((bmp_version_major < 5 && bmp_version_minor != 1) || bmp_version_major > 5) {
                NV_ERROR(dev, "You have an unsupported BMP version. "
                                "Please send in your bios\n");
                return -ENOSYS;
        }

        if (bmp_version_major == 0)
                /* nothing that's currently useful in this version */
                return 0;
        else if (bmp_version_major == 1)
                bmplength = 44; /* exact for 1.01 */
        else if (bmp_version_major == 2)
                bmplength = 48; /* exact for 2.01 */
        else if (bmp_version_major == 3)
                bmplength = 54;
                /* guessed - mem init tables added in this version */
        else if (bmp_version_major == 4 || bmp_version_minor < 0x1)
                /* don't know if 5.0 exists... */
                bmplength = 62;
                /* guessed - BMP I2C indices added in version 4*/
        else if (bmp_version_minor < 0x6)
                bmplength = 67; /* exact for 5.01 */
        else if (bmp_version_minor < 0x10)
                bmplength = 75; /* exact for 5.06 */
        else if (bmp_version_minor == 0x10)
                bmplength = 89; /* exact for 5.10h */
        else if (bmp_version_minor < 0x14)
                bmplength = 118; /* exact for 5.11h */
        else if (bmp_version_minor < 0x24)
                /*
                 * Not sure of version where pll limits came in;
                 * certainly exist by 0x24 though.
                 */
                /* length not exact: this is long enough to get lvds members */
                bmplength = 123;
        else if (bmp_version_minor < 0x27)
                /*
                 * Length not exact: this is long enough to get pll limit
                 * member
                 */
                bmplength = 144;
        else
                /*
                 * Length not exact: this is long enough to get dual link
                 * transition clock.
                 */
                bmplength = 158;

        /* checksum */
        if (nv_cksum(bmp, 8)) {
                NV_ERROR(dev, "Bad BMP checksum\n");
                return -EINVAL;
        }

        /*
         * Bit 4 seems to indicate either a mobile bios or a quadro card --
         * mobile behaviour consistent (nv11+), quadro only seen nv18gl-nv36gl
         * (not nv10gl), bit 5 that the flat panel tables are present, and
         * bit 6 a tv bios.
         */
        bios->feature_byte = bmp[9];

        parse_bios_version(dev, bios, offset + 10);

        if (bmp_version_major < 5 || bmp_version_minor < 0x10)
                bios->old_style_init = true;
        legacy_scripts_offset = 18;
        if (bmp_version_major < 2)
                legacy_scripts_offset -= 4;
        bios->init_script_tbls_ptr = ROM16(bmp[legacy_scripts_offset]);
        bios->extra_init_script_tbl_ptr = ROM16(bmp[legacy_scripts_offset + 2]);

        if (bmp_version_major > 2) {    /* appears in BMP 3 */
                bios->legacy.mem_init_tbl_ptr = ROM16(bmp[24]);
                bios->legacy.sdr_seq_tbl_ptr = ROM16(bmp[26]);
                bios->legacy.ddr_seq_tbl_ptr = ROM16(bmp[28]);
        }

        legacy_i2c_offset = 0x48;       /* BMP version 2 & 3 */
        if (bmplength > 61)
                legacy_i2c_offset = offset + 54;
        bios->legacy.i2c_indices.crt = bios->data[legacy_i2c_offset];
        bios->legacy.i2c_indices.tv = bios->data[legacy_i2c_offset + 1];
        bios->legacy.i2c_indices.panel = bios->data[legacy_i2c_offset + 2];
        if (bios->data[legacy_i2c_offset + 4])
                bios->dcb.i2c[0].write = bios->data[legacy_i2c_offset + 4];
        if (bios->data[legacy_i2c_offset + 5])
                bios->dcb.i2c[0].read = bios->data[legacy_i2c_offset + 5];
        if (bios->data[legacy_i2c_offset + 6])
                bios->dcb.i2c[1].write = bios->data[legacy_i2c_offset + 6];
        if (bios->data[legacy_i2c_offset + 7])
                bios->dcb.i2c[1].read = bios->data[legacy_i2c_offset + 7];

        if (bmplength > 74) {
                bios->fmaxvco = ROM32(bmp[67]);
                bios->fminvco = ROM32(bmp[71]);
        }
        if (bmplength > 88)
                parse_script_table_pointers(bios, offset + 75);
        if (bmplength > 94) {
                bios->tmds.output0_script_ptr = ROM16(bmp[89]);
                bios->tmds.output1_script_ptr = ROM16(bmp[91]);
                /*
                 * Never observed in use with lvds scripts, but is reused for
                 * 18/24 bit panel interface default for EDID equipped panels
                 * (if_is_24bit not set directly to avoid any oscillation).
                 */
                bios->legacy.lvds_single_a_script_ptr = ROM16(bmp[95]);
        }
        if (bmplength > 108) {
                bios->fp.fptablepointer = ROM16(bmp[105]);
                bios->fp.fpxlatetableptr = ROM16(bmp[107]);
                bios->fp.xlatwidth = 1;
        }
        if (bmplength > 120) {
                bios->fp.lvdsmanufacturerpointer = ROM16(bmp[117]);
                bios->fp.fpxlatemanufacturertableptr = ROM16(bmp[119]);
        }
        if (bmplength > 143)
                bios->pll_limit_tbl_ptr = ROM16(bmp[142]);

        if (bmplength > 157)
                bios->fp.duallink_transition_clk = ROM16(bmp[156]) * 10;

        return 0;
}

static uint16_t findstr(uint8_t *data, int n, const uint8_t *str, int len)
{
        int i, j;

        for (i = 0; i <= (n - len); i++) {
                for (j = 0; j < len; j++)
                        if (data[i + j] != str[j])
                                break;
                if (j == len)
                        return i;
        }

        return 0;
}

static struct dcb_gpio_entry *
new_gpio_entry(struct nvbios *bios)
{
        struct drm_device *dev = bios->dev;
        struct dcb_gpio_table *gpio = &bios->dcb.gpio;

        if (gpio->entries >= DCB_MAX_NUM_GPIO_ENTRIES) {
                NV_ERROR(dev, "exceeded maximum number of gpio entries!!\n");
                return NULL;
        }

        return &gpio->entry[gpio->entries++];
}

struct dcb_gpio_entry *
nouveau_bios_gpio_entry(struct drm_device *dev, enum dcb_gpio_tag tag)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        int i;

        for (i = 0; i < bios->dcb.gpio.entries; i++) {
                if (bios->dcb.gpio.entry[i].tag != tag)
                        continue;

                return &bios->dcb.gpio.entry[i];
        }

        return NULL;
}

static void
parse_dcb_gpio_table(struct nvbios *bios)
{
        struct drm_device *dev = bios->dev;
        struct dcb_gpio_entry *e;
        u8 headerlen, entries, recordlen;
        u8 *dcb, *gpio = NULL, *entry;
        int i;

        dcb = ROMPTR(bios, bios->data[0x36]);
        if (dcb[0] >= 0x30) {
                gpio = ROMPTR(bios, dcb[10]);
                if (!gpio)
                        goto no_table;

                headerlen = gpio[1];
                entries   = gpio[2];
                recordlen = gpio[3];
        } else
        if (dcb[0] >= 0x22 && dcb[-1] >= 0x13) {
                gpio = ROMPTR(bios, dcb[-15]);
                if (!gpio)
                        goto no_table;

                headerlen = 3;
                entries   = gpio[2];
                recordlen = gpio[1];
        } else
        if (dcb[0] >= 0x22) {
                /* No GPIO table present, parse the TVDAC GPIO data. */
                uint8_t *tvdac_gpio = &dcb[-5];

                if (tvdac_gpio[0] & 1) {
                        e = new_gpio_entry(bios);
                        e->tag = DCB_GPIO_TVDAC0;
                        e->line = tvdac_gpio[1] >> 4;
                        e->invert = tvdac_gpio[0] & 2;
                }

                goto no_table;
        } else {
                NV_DEBUG(dev, "no/unknown gpio table on DCB 0x%02x\n", dcb[0]);
                goto no_table;
        }

        entry = gpio + headerlen;
        for (i = 0; i < entries; i++, entry += recordlen) {
                e = new_gpio_entry(bios);
                if (!e)
                        break;

                if (gpio[0] < 0x40) {
                        e->entry = ROM16(entry[0]);
                        e->tag = (e->entry & 0x07e0) >> 5;
                        if (e->tag == 0x3f) {
                                bios->dcb.gpio.entries--;
                                continue;
                        }

                        e->line = (e->entry & 0x001f);
                        e->invert = ((e->entry & 0xf800) >> 11) != 4;
                } else {
                        e->entry = ROM32(entry[0]);
                        e->tag = (e->entry & 0x0000ff00) >> 8;
                        if (e->tag == 0xff) {
                                bios->dcb.gpio.entries--;
                                continue;
                        }

                        e->line = (e->entry & 0x0000001f) >> 0;
                        e->state_default = (e->entry & 0x01000000) >> 24;
                        e->state[0] = (e->entry & 0x18000000) >> 27;
                        e->state[1] = (e->entry & 0x60000000) >> 29;
                }
        }

no_table:
        /* Apple iMac G4 NV18 */
        if (nv_match_device(dev, 0x0189, 0x10de, 0x0010)) {
                e = new_gpio_entry(bios);
                if (e) {
                        e->tag = DCB_GPIO_TVDAC0;
                        e->line = 4;
                }
        }
}

struct dcb_connector_table_entry *
nouveau_bios_connector_entry(struct drm_device *dev, int index)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        struct dcb_connector_table_entry *cte;

        if (index >= bios->dcb.connector.entries)
                return NULL;

        cte = &bios->dcb.connector.entry[index];
        if (cte->type == 0xff)
                return NULL;

        return cte;
}

static enum dcb_connector_type
divine_connector_type(struct nvbios *bios, int index)
{
        struct dcb_table *dcb = &bios->dcb;
        unsigned encoders = 0, type = DCB_CONNECTOR_NONE;
        int i;

        for (i = 0; i < dcb->entries; i++) {
                if (dcb->entry[i].connector == index)
                        encoders |= (1 << dcb->entry[i].type);
        }

        if (encoders & (1 << OUTPUT_DP)) {
                if (encoders & (1 << OUTPUT_TMDS))
                        type = DCB_CONNECTOR_DP;
                else
                        type = DCB_CONNECTOR_eDP;
        } else
        if (encoders & (1 << OUTPUT_TMDS)) {
                if (encoders & (1 << OUTPUT_ANALOG))
                        type = DCB_CONNECTOR_DVI_I;
                else
                        type = DCB_CONNECTOR_DVI_D;
        } else
        if (encoders & (1 << OUTPUT_ANALOG)) {
                type = DCB_CONNECTOR_VGA;
        } else
        if (encoders & (1 << OUTPUT_LVDS)) {
                type = DCB_CONNECTOR_LVDS;
        } else
        if (encoders & (1 << OUTPUT_TV)) {
                type = DCB_CONNECTOR_TV_0;
        }

        return type;
}

static void
apply_dcb_connector_quirks(struct nvbios *bios, int idx)
{
        struct dcb_connector_table_entry *cte = &bios->dcb.connector.entry[idx];
        struct drm_device *dev = bios->dev;

        /* Gigabyte NX85T */
        if (nv_match_device(dev, 0x0421, 0x1458, 0x344c)) {
                if (cte->type == DCB_CONNECTOR_HDMI_1)
                        cte->type = DCB_CONNECTOR_DVI_I;
        }

        /* Gigabyte GV-NX86T512H */
        if (nv_match_device(dev, 0x0402, 0x1458, 0x3455)) {
                if (cte->type == DCB_CONNECTOR_HDMI_1)
                        cte->type = DCB_CONNECTOR_DVI_I;
        }
}

static const u8 hpd_gpio[16] = {
        0xff, 0x07, 0x08, 0xff, 0xff, 0x51, 0x52, 0xff,
        0xff, 0xff, 0xff, 0xff, 0xff, 0x5e, 0x5f, 0x60,
};

static void
parse_dcb_connector_table(struct nvbios *bios)
{
        struct drm_device *dev = bios->dev;
        struct dcb_connector_table *ct = &bios->dcb.connector;
        struct dcb_connector_table_entry *cte;
        uint8_t *conntab = &bios->data[bios->dcb.connector_table_ptr];
        uint8_t *entry;
        int i;

        if (!bios->dcb.connector_table_ptr) {
                NV_DEBUG_KMS(dev, "No DCB connector table present\n");
                return;
        }

        NV_INFO(dev, "DCB connector table: VHER 0x%02x %d %d %d\n",
                conntab[0], conntab[1], conntab[2], conntab[3]);
        if ((conntab[0] != 0x30 && conntab[0] != 0x40) ||
            (conntab[3] != 2 && conntab[3] != 4)) {
                NV_ERROR(dev, "  Unknown!  Please report.\n");
                return;
        }

        ct->entries = conntab[2];

        entry = conntab + conntab[1];
        cte = &ct->entry[0];
        for (i = 0; i < conntab[2]; i++, entry += conntab[3], cte++) {
                cte->index = i;
                if (conntab[3] == 2)
                        cte->entry = ROM16(entry[0]);
                else
                        cte->entry = ROM32(entry[0]);

                cte->type  = (cte->entry & 0x000000ff) >> 0;
                cte->index2 = (cte->entry & 0x00000f00) >> 8;

                cte->gpio_tag = ffs((cte->entry & 0x07033000) >> 12);
                cte->gpio_tag = hpd_gpio[cte->gpio_tag];

                if (cte->type == 0xff)
                        continue;

                apply_dcb_connector_quirks(bios, i);

                NV_INFO(dev, "  %d: 0x%08x: type 0x%02x idx %d tag 0x%02x\n",
                        i, cte->entry, cte->type, cte->index, cte->gpio_tag);

                /* check for known types, fallback to guessing the type
                 * from attached encoders if we hit an unknown.
                 */
                switch (cte->type) {
                case DCB_CONNECTOR_VGA:
                case DCB_CONNECTOR_TV_0:
                case DCB_CONNECTOR_TV_1:
                case DCB_CONNECTOR_TV_3:
                case DCB_CONNECTOR_DVI_I:
                case DCB_CONNECTOR_DVI_D:
                case DCB_CONNECTOR_LVDS:
                case DCB_CONNECTOR_LVDS_SPWG:
                case DCB_CONNECTOR_DP:
                case DCB_CONNECTOR_eDP:
                case DCB_CONNECTOR_HDMI_0:
                case DCB_CONNECTOR_HDMI_1:
                        break;
                default:
                        cte->type = divine_connector_type(bios, cte->index);
                        NV_WARN(dev, "unknown type, using 0x%02x\n", cte->type);
                        break;
                }

                if (nouveau_override_conntype) {
                        int type = divine_connector_type(bios, cte->index);
                        if (type != cte->type)
                                NV_WARN(dev, " -> type 0x%02x\n", cte->type);
                }

        }
}

static struct dcb_entry *new_dcb_entry(struct dcb_table *dcb)
{
        struct dcb_entry *entry = &dcb->entry[dcb->entries];

        memset(entry, 0, sizeof(struct dcb_entry));
        entry->index = dcb->entries++;

        return entry;
}

static void fabricate_dcb_output(struct dcb_table *dcb, int type, int i2c,
                                 int heads, int or)
{
        struct dcb_entry *entry = new_dcb_entry(dcb);

        entry->type = type;
        entry->i2c_index = i2c;
        entry->heads = heads;
        if (type != OUTPUT_ANALOG)
                entry->location = !DCB_LOC_ON_CHIP; /* ie OFF CHIP */
        entry->or = or;
}

static bool
parse_dcb20_entry(struct drm_device *dev, struct dcb_table *dcb,
                  uint32_t conn, uint32_t conf, struct dcb_entry *entry)
{
        entry->type = conn & 0xf;
        entry->i2c_index = (conn >> 4) & 0xf;
        entry->heads = (conn >> 8) & 0xf;
        if (dcb->version >= 0x40)
                entry->connector = (conn >> 12) & 0xf;
        entry->bus = (conn >> 16) & 0xf;
        entry->location = (conn >> 20) & 0x3;
        entry->or = (conn >> 24) & 0xf;

        switch (entry->type) {
        case OUTPUT_ANALOG:
                /*
                 * Although the rest of a CRT conf dword is usually
                 * zeros, mac biosen have stuff there so we must mask
                 */
                entry->crtconf.maxfreq = (dcb->version < 0x30) ?
                                         (conf & 0xffff) * 10 :
                                         (conf & 0xff) * 10000;
                break;
        case OUTPUT_LVDS:
                {
                uint32_t mask;
                if (conf & 0x1)
                        entry->lvdsconf.use_straps_for_mode = true;
                if (dcb->version < 0x22) {
                        mask = ~0xd;
                        /*
                         * The laptop in bug 14567 lies and claims to not use
                         * straps when it does, so assume all DCB 2.0 laptops
                         * use straps, until a broken EDID using one is produced
                         */
                        entry->lvdsconf.use_straps_for_mode = true;
                        /*
                         * Both 0x4 and 0x8 show up in v2.0 tables; assume they
                         * mean the same thing (probably wrong, but might work)
                         */
                        if (conf & 0x4 || conf & 0x8)
                                entry->lvdsconf.use_power_scripts = true;
                } else {
                        mask = ~0x7;
                        if (conf & 0x2)
                                entry->lvdsconf.use_acpi_for_edid = true;
                        if (conf & 0x4)
                                entry->lvdsconf.use_power_scripts = true;
                        entry->lvdsconf.sor.link = (conf & 0x00000030) >> 4;
                }
                if (conf & mask) {
                        /*
                         * Until we even try to use these on G8x, it's
                         * useless reporting unknown bits.  They all are.
                         */
                        if (dcb->version >= 0x40)
                                break;

                        NV_ERROR(dev, "Unknown LVDS configuration bits, "
                                      "please report\n");
                }
                break;
                }
        case OUTPUT_TV:
        {
                if (dcb->version >= 0x30)
                        entry->tvconf.has_component_output = conf & (0x8 << 4);
                else
                        entry->tvconf.has_component_output = false;

                break;
        }
        case OUTPUT_DP:
                entry->dpconf.sor.link = (conf & 0x00000030) >> 4;
                entry->dpconf.link_bw = (conf & 0x00e00000) >> 21;
                switch ((conf & 0x0f000000) >> 24) {
                case 0xf:
                        entry->dpconf.link_nr = 4;
                        break;
                case 0x3:
                        entry->dpconf.link_nr = 2;
                        break;
                default:
                        entry->dpconf.link_nr = 1;
                        break;
                }
                break;
        case OUTPUT_TMDS:
                if (dcb->version >= 0x40)
                        entry->tmdsconf.sor.link = (conf & 0x00000030) >> 4;
                else if (dcb->version >= 0x30)
                        entry->tmdsconf.slave_addr = (conf & 0x00000700) >> 8;
                else if (dcb->version >= 0x22)
                        entry->tmdsconf.slave_addr = (conf & 0x00000070) >> 4;

                break;
        case OUTPUT_EOL:
                /* weird g80 mobile type that "nv" treats as a terminator */
                dcb->entries--;
                return false;
        default:
                break;
        }

        if (dcb->version < 0x40) {
                /* Normal entries consist of a single bit, but dual link has
                 * the next most significant bit set too
                 */
                entry->duallink_possible =
                        ((1 << (ffs(entry->or) - 1)) * 3 == entry->or);
        } else {
                entry->duallink_possible = (entry->sorconf.link == 3);
        }

        /* unsure what DCB version introduces this, 3.0? */
        if (conf & 0x100000)
                entry->i2c_upper_default = true;

        return true;
}

static bool
parse_dcb15_entry(struct drm_device *dev, struct dcb_table *dcb,
                  uint32_t conn, uint32_t conf, struct dcb_entry *entry)
{
        switch (conn & 0x0000000f) {
        case 0:
                entry->type = OUTPUT_ANALOG;
                break;
        case 1:
                entry->type = OUTPUT_TV;
                break;
        case 2:
        case 4:
                if (conn & 0x10)
                        entry->type = OUTPUT_LVDS;
                else
                        entry->type = OUTPUT_TMDS;
                break;
        case 3:
                entry->type = OUTPUT_LVDS;
                break;
        default:
                NV_ERROR(dev, "Unknown DCB type %d\n", conn & 0x0000000f);
                return false;
        }

        entry->i2c_index = (conn & 0x0003c000) >> 14;
        entry->heads = ((conn & 0x001c0000) >> 18) + 1;
        entry->or = entry->heads; /* same as heads, hopefully safe enough */
        entry->location = (conn & 0x01e00000) >> 21;
        entry->bus = (conn & 0x0e000000) >> 25;
        entry->duallink_possible = false;

        switch (entry->type) {
        case OUTPUT_ANALOG:
                entry->crtconf.maxfreq = (conf & 0xffff) * 10;
                break;
        case OUTPUT_TV:
                entry->tvconf.has_component_output = false;
                break;
        case OUTPUT_LVDS:
                if ((conn & 0x00003f00) >> 8 != 0x10)
                        entry->lvdsconf.use_straps_for_mode = true;
                entry->lvdsconf.use_power_scripts = true;
                break;
        default:
                break;
        }

        return true;
}

static bool parse_dcb_entry(struct drm_device *dev, struct dcb_table *dcb,
                            uint32_t conn, uint32_t conf)
{
        struct dcb_entry *entry = new_dcb_entry(dcb);
        bool ret;

        if (dcb->version >= 0x20)
                ret = parse_dcb20_entry(dev, dcb, conn, conf, entry);
        else
                ret = parse_dcb15_entry(dev, dcb, conn, conf, entry);
        if (!ret)
                return ret;

        read_dcb_i2c_entry(dev, dcb->version, dcb->i2c_table,
                           entry->i2c_index, &dcb->i2c[entry->i2c_index]);

        return true;
}

static
void merge_like_dcb_entries(struct drm_device *dev, struct dcb_table *dcb)
{
        /*
         * DCB v2.0 lists each output combination separately.
         * Here we merge compatible entries to have fewer outputs, with
         * more options
         */

        int i, newentries = 0;

        for (i = 0; i < dcb->entries; i++) {
                struct dcb_entry *ient = &dcb->entry[i];
                int j;

                for (j = i + 1; j < dcb->entries; j++) {
                        struct dcb_entry *jent = &dcb->entry[j];

                        if (jent->type == 100) /* already merged entry */
                                continue;

                        /* merge heads field when all other fields the same */
                        if (jent->i2c_index == ient->i2c_index &&
                            jent->type == ient->type &&
                            jent->location == ient->location &&
                            jent->or == ient->or) {
                                NV_TRACE(dev, "Merging DCB entries %d and %d\n",
                                         i, j);
                                ient->heads |= jent->heads;
                                jent->type = 100; /* dummy value */
                        }
                }
        }

        /* Compact entries merged into others out of dcb */
        for (i = 0; i < dcb->entries; i++) {
                if (dcb->entry[i].type == 100)
                        continue;

                if (newentries != i) {
                        dcb->entry[newentries] = dcb->entry[i];
                        dcb->entry[newentries].index = newentries;
                }
                newentries++;
        }

        dcb->entries = newentries;
}

static bool
apply_dcb_encoder_quirks(struct drm_device *dev, int idx, u32 *conn, u32 *conf)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct dcb_table *dcb = &dev_priv->vbios.dcb;

        /* Dell Precision M6300
         *   DCB entry 2: 02025312 00000010
         *   DCB entry 3: 02026312 00000020
         *
         * Identical, except apparently a different connector on a
         * different SOR link.  Not a clue how we're supposed to know
         * which one is in use if it even shares an i2c line...
         *
         * Ignore the connector on the second SOR link to prevent
         * nasty problems until this is sorted (assuming it's not a
         * VBIOS bug).
         */
        if (nv_match_device(dev, 0x040d, 0x1028, 0x019b)) {
                if (*conn == 0x02026312 && *conf == 0x00000020)
                        return false;
        }

        /* GeForce3 Ti 200
         *
         * DCB reports an LVDS output that should be TMDS:
         *   DCB entry 1: f2005014 ffffffff
         */
        if (nv_match_device(dev, 0x0201, 0x1462, 0x8851)) {
                if (*conn == 0xf2005014 && *conf == 0xffffffff) {
                        fabricate_dcb_output(dcb, OUTPUT_TMDS, 1, 1, 1);
                        return false;
                }
        }

        /* XFX GT-240X-YA
         *
         * So many things wrong here, replace the entire encoder table..
         */
        if (nv_match_device(dev, 0x0ca3, 0x1682, 0x3003)) {
                if (idx == 0) {
                        *conn = 0x02001300; /* VGA, connector 1 */
                        *conf = 0x00000028;
                } else
                if (idx == 1) {
                        *conn = 0x01010312; /* DVI, connector 0 */
                        *conf = 0x00020030;
                } else
                if (idx == 2) {
                        *conn = 0x01010310; /* VGA, connector 0 */
                        *conf = 0x00000028;
                } else
                if (idx == 3) {
                        *conn = 0x02022362; /* HDMI, connector 2 */
                        *conf = 0x00020010;
                } else {
                        *conn = 0x0000000e; /* EOL */
                        *conf = 0x00000000;
                }
        }

        /* Some other twisted XFX board (rhbz#694914)
         *
         * The DVI/VGA encoder combo that's supposed to represent the
         * DVI-I connector actually point at two different ones, and
         * the HDMI connector ends up paired with the VGA instead.
         *
         * Connector table is missing anything for VGA at all, pointing it
         * an invalid conntab entry 2 so we figure it out ourself.
         */
        if (nv_match_device(dev, 0x0615, 0x1682, 0x2605)) {
                if (idx == 0) {
                        *conn = 0x02002300; /* VGA, connector 2 */
                        *conf = 0x00000028;
                } else
                if (idx == 1) {
                        *conn = 0x01010312; /* DVI, connector 0 */
                        *conf = 0x00020030;
                } else
                if (idx == 2) {
                        *conn = 0x04020310; /* VGA, connector 0 */
                        *conf = 0x00000028;
                } else
                if (idx == 3) {
                        *conn = 0x02021322; /* HDMI, connector 1 */
                        *conf = 0x00020010;
                } else {
                        *conn = 0x0000000e; /* EOL */
                        *conf = 0x00000000;
                }
        }

        return true;
}

static void
fabricate_dcb_encoder_table(struct drm_device *dev, struct nvbios *bios)
{
        struct dcb_table *dcb = &bios->dcb;
        int all_heads = (nv_two_heads(dev) ? 3 : 1);

#ifdef __powerpc__
        /* Apple iMac G4 NV17 */
        if (of_machine_is_compatible("PowerMac4,5")) {
                fabricate_dcb_output(dcb, OUTPUT_TMDS, 0, all_heads, 1);
                fabricate_dcb_output(dcb, OUTPUT_ANALOG, 1, all_heads, 2);
                return;
        }
#endif

        /* Make up some sane defaults */
        fabricate_dcb_output(dcb, OUTPUT_ANALOG, LEGACY_I2C_CRT, 1, 1);

        if (nv04_tv_identify(dev, bios->legacy.i2c_indices.tv) >= 0)
                fabricate_dcb_output(dcb, OUTPUT_TV, LEGACY_I2C_TV,
                                     all_heads, 0);

        else if (bios->tmds.output0_script_ptr ||
                 bios->tmds.output1_script_ptr)
                fabricate_dcb_output(dcb, OUTPUT_TMDS, LEGACY_I2C_PANEL,
                                     all_heads, 1);
}

static int
parse_dcb_table(struct drm_device *dev, struct nvbios *bios)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct dcb_table *dcb = &bios->dcb;
        uint16_t dcbptr = 0, i2ctabptr = 0;
        uint8_t *dcbtable;
        uint8_t headerlen = 0x4, entries = DCB_MAX_NUM_ENTRIES;
        bool configblock = true;
        int recordlength = 8, confofs = 4;
        int i;

        /* get the offset from 0x36 */
        if (dev_priv->card_type > NV_04) {
                dcbptr = ROM16(bios->data[0x36]);
                if (dcbptr == 0x0000)
                        NV_WARN(dev, "No output data (DCB) found in BIOS\n");
        }

        /* this situation likely means a really old card, pre DCB */
        if (dcbptr == 0x0) {
                fabricate_dcb_encoder_table(dev, bios);
                return 0;
        }

        dcbtable = &bios->data[dcbptr];

        /* get DCB version */
        dcb->version = dcbtable[0];
        NV_TRACE(dev, "Found Display Configuration Block version %d.%d\n",
                 dcb->version >> 4, dcb->version & 0xf);

        if (dcb->version >= 0x20) { /* NV17+ */
                uint32_t sig;

                if (dcb->version >= 0x30) { /* NV40+ */
                        headerlen = dcbtable[1];
                        entries = dcbtable[2];
                        recordlength = dcbtable[3];
                        i2ctabptr = ROM16(dcbtable[4]);
                        sig = ROM32(dcbtable[6]);
                        dcb->gpio_table_ptr = ROM16(dcbtable[10]);
                        dcb->connector_table_ptr = ROM16(dcbtable[20]);
                } else {
                        i2ctabptr = ROM16(dcbtable[2]);
                        sig = ROM32(dcbtable[4]);
                        headerlen = 8;
                }

                if (sig != 0x4edcbdcb) {
                        NV_ERROR(dev, "Bad Display Configuration Block "
                                        "signature (%08X)\n", sig);
                        return -EINVAL;
                }
        } else if (dcb->version >= 0x15) { /* some NV11 and NV20 */
                char sig[8] = { 0 };

                strncpy(sig, (char *)&dcbtable[-7], 7);
                i2ctabptr = ROM16(dcbtable[2]);
                recordlength = 10;
                confofs = 6;

                if (strcmp(sig, "DEV_REC")) {
                        NV_ERROR(dev, "Bad Display Configuration Block "
                                        "signature (%s)\n", sig);
                        return -EINVAL;
                }
        } else {
                /*
                 * v1.4 (some NV15/16, NV11+) seems the same as v1.5, but always
                 * has the same single (crt) entry, even when tv-out present, so
                 * the conclusion is this version cannot really be used.
                 * v1.2 tables (some NV6/10, and NV15+) normally have the same
                 * 5 entries, which are not specific to the card and so no use.
                 * v1.2 does have an I2C table that read_dcb_i2c_table can
                 * handle, but cards exist (nv11 in #14821) with a bad i2c table
                 * pointer, so use the indices parsed in parse_bmp_structure.
                 * v1.1 (NV5+, maybe some NV4) is entirely unhelpful
                 */
                NV_TRACEWARN(dev, "No useful information in BIOS output table; "
                                  "adding all possible outputs\n");
                fabricate_dcb_encoder_table(dev, bios);
                return 0;
        }

        if (!i2ctabptr)
                NV_WARN(dev, "No pointer to DCB I2C port table\n");
        else {
                dcb->i2c_table = &bios->data[i2ctabptr];
                if (dcb->version >= 0x30)
                        dcb->i2c_default_indices = dcb->i2c_table[4];

                /*
                 * Parse the "management" I2C bus, used for hardware
                 * monitoring and some external TMDS transmitters.
                 */
                if (dcb->version >= 0x22) {
                        int idx = (dcb->version >= 0x40 ?
                                   dcb->i2c_default_indices & 0xf :
                                   2);

                        read_dcb_i2c_entry(dev, dcb->version, dcb->i2c_table,
                                           idx, &dcb->i2c[idx]);
                }
        }

        if (entries > DCB_MAX_NUM_ENTRIES)
                entries = DCB_MAX_NUM_ENTRIES;

        for (i = 0; i < entries; i++) {
                uint32_t connection, config = 0;

                connection = ROM32(dcbtable[headerlen + recordlength * i]);
                if (configblock)
                        config = ROM32(dcbtable[headerlen + confofs + recordlength * i]);

                /* seen on an NV11 with DCB v1.5 */
                if (connection == 0x00000000)
                        break;

                /* seen on an NV17 with DCB v2.0 */
                if (connection == 0xffffffff)
                        break;

                if ((connection & 0x0000000f) == 0x0000000f)
                        continue;

                if (!apply_dcb_encoder_quirks(dev, i, &connection, &config))
                        continue;

                NV_TRACEWARN(dev, "Raw DCB entry %d: %08x %08x\n",
                             dcb->entries, connection, config);

                if (!parse_dcb_entry(dev, dcb, connection, config))
                        break;
        }

        /*
         * apart for v2.1+ not being known for requiring merging, this
         * guarantees dcbent->index is the index of the entry in the rom image
         */
        if (dcb->version < 0x21)
                merge_like_dcb_entries(dev, dcb);

        if (!dcb->entries)
                return -ENXIO;

        parse_dcb_gpio_table(bios);
        parse_dcb_connector_table(bios);
        return 0;
}

static void
fixup_legacy_connector(struct nvbios *bios)
{
        struct dcb_table *dcb = &bios->dcb;
        int i, i2c, i2c_conn[DCB_MAX_NUM_I2C_ENTRIES] = { };

        /*
         * DCB 3.0 also has the table in most cases, but there are some cards
         * where the table is filled with stub entries, and the DCB entriy
         * indices are all 0.  We don't need the connector indices on pre-G80
         * chips (yet?) so limit the use to DCB 4.0 and above.
         */
        if (dcb->version >= 0x40)
                return;

        dcb->connector.entries = 0;

        /*
         * No known connector info before v3.0, so make it up.  the rule here
         * is: anything on the same i2c bus is considered to be on the same
         * connector.  any output without an associated i2c bus is assigned
         * its own unique connector index.
         */
        for (i = 0; i < dcb->entries; i++) {
                /*
                 * Ignore the I2C index for on-chip TV-out, as there
                 * are cards with bogus values (nv31m in bug 23212),
                 * and it's otherwise useless.
                 */
                if (dcb->entry[i].type == OUTPUT_TV &&
                    dcb->entry[i].location == DCB_LOC_ON_CHIP)
                        dcb->entry[i].i2c_index = 0xf;
                i2c = dcb->entry[i].i2c_index;

                if (i2c_conn[i2c]) {
                        dcb->entry[i].connector = i2c_conn[i2c] - 1;
                        continue;
                }

                dcb->entry[i].connector = dcb->connector.entries++;
                if (i2c != 0xf)
                        i2c_conn[i2c] = dcb->connector.entries;
        }

        /* Fake the connector table as well as just connector indices */
        for (i = 0; i < dcb->connector.entries; i++) {
                dcb->connector.entry[i].index = i;
                dcb->connector.entry[i].type = divine_connector_type(bios, i);
                dcb->connector.entry[i].gpio_tag = 0xff;
        }
}

static void
fixup_legacy_i2c(struct nvbios *bios)
{
        struct dcb_table *dcb = &bios->dcb;
        int i;

        for (i = 0; i < dcb->entries; i++) {
                if (dcb->entry[i].i2c_index == LEGACY_I2C_CRT)
                        dcb->entry[i].i2c_index = bios->legacy.i2c_indices.crt;
                if (dcb->entry[i].i2c_index == LEGACY_I2C_PANEL)
                        dcb->entry[i].i2c_index = bios->legacy.i2c_indices.panel;
                if (dcb->entry[i].i2c_index == LEGACY_I2C_TV)
                        dcb->entry[i].i2c_index = bios->legacy.i2c_indices.tv;
        }
}

static int load_nv17_hwsq_ucode_entry(struct drm_device *dev, struct nvbios *bios, uint16_t hwsq_offset, int entry)
{
        /*
         * The header following the "HWSQ" signature has the number of entries,
         * and the entry size
         *
         * An entry consists of a dword to write to the sequencer control reg
         * (0x00001304), followed by the ucode bytes, written sequentially,
         * starting at reg 0x00001400
         */

        uint8_t bytes_to_write;
        uint16_t hwsq_entry_offset;
        int i;

        if (bios->data[hwsq_offset] <= entry) {
                NV_ERROR(dev, "Too few entries in HW sequencer table for "
                                "requested entry\n");
                return -ENOENT;
        }

        bytes_to_write = bios->data[hwsq_offset + 1];

        if (bytes_to_write != 36) {
                NV_ERROR(dev, "Unknown HW sequencer entry size\n");
                return -EINVAL;
        }

        NV_TRACE(dev, "Loading NV17 power sequencing microcode\n");

        hwsq_entry_offset = hwsq_offset + 2 + entry * bytes_to_write;

        /* set sequencer control */
        bios_wr32(bios, 0x00001304, ROM32(bios->data[hwsq_entry_offset]));
        bytes_to_write -= 4;

        /* write ucode */
        for (i = 0; i < bytes_to_write; i += 4)
                bios_wr32(bios, 0x00001400 + i, ROM32(bios->data[hwsq_entry_offset + i + 4]));

        /* twiddle NV_PBUS_DEBUG_4 */
        bios_wr32(bios, NV_PBUS_DEBUG_4, bios_rd32(bios, NV_PBUS_DEBUG_4) | 0x18);

        return 0;
}

static int load_nv17_hw_sequencer_ucode(struct drm_device *dev,
                                        struct nvbios *bios)
{
        /*
         * BMP based cards, from NV17, need a microcode loading to correctly
         * control the GPIO etc for LVDS panels
         *
         * BIT based cards seem to do this directly in the init scripts
         *
         * The microcode entries are found by the "HWSQ" signature.
         */

        const uint8_t hwsq_signature[] = { 'H', 'W', 'S', 'Q' };
        const int sz = sizeof(hwsq_signature);
        int hwsq_offset;

        hwsq_offset = findstr(bios->data, bios->length, hwsq_signature, sz);
        if (!hwsq_offset)
                return 0;

        /* always use entry 0? */
        return load_nv17_hwsq_ucode_entry(dev, bios, hwsq_offset + sz, 0);
}

uint8_t *nouveau_bios_embedded_edid(struct drm_device *dev)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        const uint8_t edid_sig[] = {
                        0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 };
        uint16_t offset = 0;
        uint16_t newoffset;
        int searchlen = NV_PROM_SIZE;

        if (bios->fp.edid)
                return bios->fp.edid;

        while (searchlen) {
                newoffset = findstr(&bios->data[offset], searchlen,
                                                                edid_sig, 8);
                if (!newoffset)
                        return NULL;
                offset += newoffset;
                if (!nv_cksum(&bios->data[offset], EDID1_LEN))
                        break;

                searchlen -= offset;
                offset++;
        }

        NV_TRACE(dev, "Found EDID in BIOS\n");

        return bios->fp.edid = &bios->data[offset];
}

void
nouveau_bios_run_init_table(struct drm_device *dev, uint16_t table,
                            struct dcb_entry *dcbent)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        struct init_exec iexec = { true, false };

        spin_lock_bh(&bios->lock);
        bios->display.output = dcbent;
        parse_init_table(bios, table, &iexec);
        bios->display.output = NULL;
        spin_unlock_bh(&bios->lock);
}

static bool NVInitVBIOS(struct drm_device *dev)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;

        memset(bios, 0, sizeof(struct nvbios));
        spin_lock_init(&bios->lock);
        bios->dev = dev;

        if (!NVShadowVBIOS(dev, bios->data))
                return false;

        bios->length = NV_PROM_SIZE;
        return true;
}

static int nouveau_parse_vbios_struct(struct drm_device *dev)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        const uint8_t bit_signature[] = { 0xff, 0xb8, 'B', 'I', 'T' };
        const uint8_t bmp_signature[] = { 0xff, 0x7f, 'N', 'V', 0x0 };
        int offset;

        offset = findstr(bios->data, bios->length,
                                        bit_signature, sizeof(bit_signature));
        if (offset) {
                NV_TRACE(dev, "BIT BIOS found\n");
                bios->type = NVBIOS_BIT;
                bios->offset = offset;
                return parse_bit_structure(bios, offset + 6);
        }

        offset = findstr(bios->data, bios->length,
                                        bmp_signature, sizeof(bmp_signature));
        if (offset) {
                NV_TRACE(dev, "BMP BIOS found\n");
                bios->type = NVBIOS_BMP;
                bios->offset = offset;
                return parse_bmp_structure(dev, bios, offset);
        }

        NV_ERROR(dev, "No known BIOS signature found\n");
        return -ENODEV;
}

int
nouveau_run_vbios_init(struct drm_device *dev)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        int i, ret = 0;

        /* Reset the BIOS head to 0. */
        bios->state.crtchead = 0;

        if (bios->major_version < 5)    /* BMP only */
                load_nv17_hw_sequencer_ucode(dev, bios);

        if (bios->execute) {
                bios->fp.last_script_invoc = 0;
                bios->fp.lvds_init_run = false;
        }

        parse_init_tables(bios);

        /*
         * Runs some additional script seen on G8x VBIOSen.  The VBIOS'
         * parser will run this right after the init tables, the binary
         * driver appears to run it at some point later.
         */
        if (bios->some_script_ptr) {
                struct init_exec iexec = {true, false};

                NV_INFO(dev, "Parsing VBIOS init table at offset 0x%04X\n",
                        bios->some_script_ptr);
                parse_init_table(bios, bios->some_script_ptr, &iexec);
        }

        if (dev_priv->card_type >= NV_50) {
                for (i = 0; i < bios->dcb.entries; i++) {
                        nouveau_bios_run_display_table(dev,
                                                       &bios->dcb.entry[i],
                                                       0, 0);
                }
        }

        return ret;
}

static void
nouveau_bios_i2c_devices_takedown(struct drm_device *dev)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        struct dcb_i2c_entry *entry;
        int i;

        entry = &bios->dcb.i2c[0];
        for (i = 0; i < DCB_MAX_NUM_I2C_ENTRIES; i++, entry++)
                nouveau_i2c_fini(dev, entry);
}

static bool
nouveau_bios_posted(struct drm_device *dev)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        unsigned htotal;

        if (dev_priv->card_type >= NV_50) {
                if (NVReadVgaCrtc(dev, 0, 0x00) == 0 &&
                    NVReadVgaCrtc(dev, 0, 0x1a) == 0)
                        return false;
                return true;
        }

        htotal  = NVReadVgaCrtc(dev, 0, 0x06);
        htotal |= (NVReadVgaCrtc(dev, 0, 0x07) & 0x01) << 8;
        htotal |= (NVReadVgaCrtc(dev, 0, 0x07) & 0x20) << 4;
        htotal |= (NVReadVgaCrtc(dev, 0, 0x25) & 0x01) << 10;
        htotal |= (NVReadVgaCrtc(dev, 0, 0x41) & 0x01) << 11;

        return (htotal != 0);
}

int
nouveau_bios_init(struct drm_device *dev)
{
        struct drm_nouveau_private *dev_priv = dev->dev_private;
        struct nvbios *bios = &dev_priv->vbios;
        int ret;

        if (!NVInitVBIOS(dev))
                return -ENODEV;

        ret = nouveau_parse_vbios_struct(dev);
        if (ret)
                return ret;

        ret = parse_dcb_table(dev, bios);
        if (ret)
                return ret;

        fixup_legacy_i2c(bios);
        fixup_legacy_connector(bios);

        if (!bios->major_version)       /* we don't run version 0 bios */
                return 0;

        /* init script execution disabled */
        bios->execute = false;

        /* ... unless card isn't POSTed already */
        if (!nouveau_bios_posted(dev)) {
                NV_INFO(dev, "Adaptor not initialised, "
                        "running VBIOS init tables.\n");
                bios->execute = true;
        }
        if (nouveau_force_post)
                bios->execute = true;

        ret = nouveau_run_vbios_init(dev);
        if (ret)
                return ret;

        /* feature_byte on BMP is poor, but init always sets CR4B */
        if (bios->major_version < 5)
                bios->is_mobile = NVReadVgaCrtc(dev, 0, NV_CIO_CRE_4B) & 0x40;

        /* all BIT systems need p_f_m_t for digital_min_front_porch */
        if (bios->is_mobile || bios->major_version >= 5)
                ret = parse_fp_mode_table(dev, bios);

        /* allow subsequent scripts to execute */
        bios->execute = true;

        return 0;
}

void
nouveau_bios_takedown(struct drm_device *dev)
{
        nouveau_bios_i2c_devices_takedown(dev);
}