avoid endless loops in lib/swiotlb.c

[wrt350n-kernel.git] / arch / arm / mach-orion / addr-map.c

/*
 * arch/arm/mach-orion/addr-map.c
 *
 * Address map functions for Marvell Orion System On Chip
 *
 * Maintainer: Tzachi Perelstein <tzachi@marvell.com>
 *
 * This file is licensed under  the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/hardware.h>
#include "common.h"

/*
 * The Orion has fully programable address map. There's a separate address
 * map for each of the device _master_ interfaces, e.g. CPU, PCI, PCIE, USB,
 * Gigabit Ethernet, DMA/XOR engines, etc. Each interface has its own
 * address decode windows that allow it to access any of the Orion resources.
 *
 * CPU address decoding --
 * Linux assumes that it is the boot loader that already setup the access to
 * DDR and internal registers.
 * Setup access to PCI and PCI-E IO/MEM space is issued by core.c.
 * Setup access to various devices located on the device bus interface (e.g.
 * flashes, RTC, etc) should be issued by machine-setup.c according to
 * specific board population (by using orion_setup_cpu_win()).
 *
 * Non-CPU Masters address decoding --
 * Unlike the CPU, we setup the access from Orion's master interfaces to DDR
 * banks only (the typical use case).
 * Setup access for each master to DDR is issued by common.c.
 *
 * Note: although orion_setbits() and orion_clrbits() are not atomic
 * no locking is necessary here since code in this file is only called
 * at boot time when there is no concurrency issues.
 */

/*
 * Generic Address Decode Windows bit settings
 */
#define TARGET_DDR              0
#define TARGET_PCI              3
#define TARGET_PCIE             4
#define TARGET_DEV_BUS          1
#define ATTR_DDR_CS(n)          (((n) ==0) ? 0xe :      \
                                ((n) == 1) ? 0xd :      \
                                ((n) == 2) ? 0xb :      \
                                ((n) == 3) ? 0x7 : 0xf)
#define ATTR_PCIE_MEM           0x59
#define ATTR_PCIE_IO            0x51
#define ATTR_PCI_MEM            0x59
#define ATTR_PCI_IO             0x51
#define ATTR_DEV_CS0            0x1e
#define ATTR_DEV_CS1            0x1d
#define ATTR_DEV_CS2            0x1b
#define ATTR_DEV_BOOT           0xf
#define WIN_EN                  1

/*
 * Helpers to get DDR banks info
 */
#define DDR_BASE_CS(n)          ORION_DDR_REG(0x1500 + ((n) * 8))
#define DDR_SIZE_CS(n)          ORION_DDR_REG(0x1504 + ((n) * 8))
#define DDR_MAX_CS              4
#define DDR_REG_TO_SIZE(reg)    (((reg) | 0xffffff) + 1)
#define DDR_REG_TO_BASE(reg)    ((reg) & 0xff000000)
#define DDR_BANK_EN             1

/*
 * CPU Address Decode Windows registers
 */
#define CPU_WIN_CTRL(n)         ORION_BRIDGE_REG(0x000 | ((n) << 4))
#define CPU_WIN_BASE(n)         ORION_BRIDGE_REG(0x004 | ((n) << 4))
#define CPU_WIN_REMAP_LO(n)     ORION_BRIDGE_REG(0x008 | ((n) << 4))
#define CPU_WIN_REMAP_HI(n)     ORION_BRIDGE_REG(0x00c | ((n) << 4))
#define CPU_MAX_WIN             8

/*
 * Use this CPU address decode windows allocation
 */
#define CPU_WIN_PCIE_IO         0
#define CPU_WIN_PCI_IO          1
#define CPU_WIN_PCIE_MEM        2
#define CPU_WIN_PCI_MEM         3
#define CPU_WIN_DEV_BOOT        4
#define CPU_WIN_DEV_CS0         5
#define CPU_WIN_DEV_CS1         6
#define CPU_WIN_DEV_CS2         7

/*
 * PCIE Address Decode Windows registers
 */
#define PCIE_BAR_CTRL(n)        ORION_PCIE_REG(0x1804 + ((n - 1) * 4))
#define PCIE_BAR_LO(n)          ORION_PCIE_REG(0x0010 + ((n) * 8))
#define PCIE_BAR_HI(n)          ORION_PCIE_REG(0x0014 + ((n) * 8))
#define PCIE_WIN_CTRL(n)        (((n) < 5) ? \
                                        ORION_PCIE_REG(0x1820 + ((n) << 4)) : \
                                        ORION_PCIE_REG(0x1880))
#define PCIE_WIN_BASE(n)        (((n) < 5) ? \
                                        ORION_PCIE_REG(0x1824 + ((n) << 4)) : \
                                        ORION_PCIE_REG(0x1884))
#define PCIE_WIN_REMAP(n)       (((n) < 5) ? \
                                        ORION_PCIE_REG(0x182c + ((n) << 4)) : \
                                        ORION_PCIE_REG(0x188c))
#define PCIE_DEFWIN_CTRL        ORION_PCIE_REG(0x18b0)
#define PCIE_EXPROM_WIN_CTRL    ORION_PCIE_REG(0x18c0)
#define PCIE_EXPROM_WIN_REMP    ORION_PCIE_REG(0x18c4)
#define PCIE_MAX_BARS           3
#define PCIE_MAX_WINS           6

/*
 * Use PCIE BAR '1' for all DDR banks
 */
#define PCIE_DRAM_BAR           1

/*
 * PCI Address Decode Windows registers
 */
#define PCI_BAR_SIZE_DDR_CS(n)  (((n) == 0) ? ORION_PCI_REG(0xc08) : \
                                ((n) == 1) ? ORION_PCI_REG(0xd08) :  \
                                ((n) == 2) ? ORION_PCI_REG(0xc0c) :  \
                                ((n) == 3) ? ORION_PCI_REG(0xd0c) : 0)
#define PCI_BAR_REMAP_DDR_CS(n) (((n) ==0) ? ORION_PCI_REG(0xc48) : \
                                ((n) == 1) ? ORION_PCI_REG(0xd48) :  \
                                ((n) == 2) ? ORION_PCI_REG(0xc4c) :  \
                                ((n) == 3) ? ORION_PCI_REG(0xd4c) : 0)
#define PCI_BAR_ENABLE          ORION_PCI_REG(0xc3c)
#define PCI_CTRL_BASE_LO(n)     ORION_PCI_REG(0x1e00 | ((n) << 4))
#define PCI_CTRL_BASE_HI(n)     ORION_PCI_REG(0x1e04 | ((n) << 4))
#define PCI_CTRL_SIZE(n)        ORION_PCI_REG(0x1e08 | ((n) << 4))
#define PCI_ADDR_DECODE_CTRL    ORION_PCI_REG(0xd3c)

/*
 * PCI configuration heleprs for BAR settings
 */
#define PCI_CONF_FUNC_BAR_CS(n)         ((n) >> 1)
#define PCI_CONF_REG_BAR_LO_CS(n)       (((n) & 1) ? 0x18 : 0x10)
#define PCI_CONF_REG_BAR_HI_CS(n)       (((n) & 1) ? 0x1c : 0x14)

/*
 * Gigabit Ethernet Address Decode Windows registers
 */
#define ETH_WIN_BASE(win)       ORION_ETH_REG(0x200 + ((win) * 8))
#define ETH_WIN_SIZE(win)       ORION_ETH_REG(0x204 + ((win) * 8))
#define ETH_WIN_REMAP(win)      ORION_ETH_REG(0x280 + ((win) * 4))
#define ETH_WIN_EN              ORION_ETH_REG(0x290)
#define ETH_WIN_PROT            ORION_ETH_REG(0x294)
#define ETH_MAX_WIN             6
#define ETH_MAX_REMAP_WIN       4

/*
 * USB Address Decode Windows registers
 */
#define USB_WIN_CTRL(i, w)      ((i == 0) ? ORION_USB0_REG(0x320 + ((w) << 4)) \
                                        : ORION_USB1_REG(0x320 + ((w) << 4)))
#define USB_WIN_BASE(i, w)      ((i == 0) ? ORION_USB0_REG(0x324 + ((w) << 4)) \
                                        : ORION_USB1_REG(0x324 + ((w) << 4)))
#define USB_MAX_WIN             4

/*
 * SATA Address Decode Windows registers
 */
#define SATA_WIN_CTRL(win)      ORION_SATA_REG(0x30 + ((win) * 0x10))
#define SATA_WIN_BASE(win)      ORION_SATA_REG(0x34 + ((win) * 0x10))
#define SATA_MAX_WIN            4

static int __init orion_cpu_win_can_remap(u32 win)
{
        u32 dev, rev;

        orion_pcie_id(&dev, &rev);
        if ((dev == MV88F5281_DEV_ID && win < 4)
            || (dev == MV88F5182_DEV_ID && win < 2)
            || (dev == MV88F5181_DEV_ID && win < 2))
                return 1;

        return 0;
}

void __init orion_setup_cpu_win(enum orion_target target, u32 base, u32 size, int remap)
{
        u32 win, attr, ctrl;

        switch (target) {
        case ORION_PCIE_IO:
                target = TARGET_PCIE;
                attr = ATTR_PCIE_IO;
                win = CPU_WIN_PCIE_IO;
                break;
        case ORION_PCI_IO:
                target = TARGET_PCI;
                attr = ATTR_PCI_IO;
                win = CPU_WIN_PCI_IO;
                break;
        case ORION_PCIE_MEM:
                target = TARGET_PCIE;
                attr = ATTR_PCIE_MEM;
                win = CPU_WIN_PCIE_MEM;
                break;
        case ORION_PCI_MEM:
                target = TARGET_PCI;
                attr = ATTR_PCI_MEM;
                win = CPU_WIN_PCI_MEM;
                break;
        case ORION_DEV_BOOT:
                target = TARGET_DEV_BUS;
                attr = ATTR_DEV_BOOT;
                win = CPU_WIN_DEV_BOOT;
                break;
        case ORION_DEV0:
                target = TARGET_DEV_BUS;
                attr = ATTR_DEV_CS0;
                win = CPU_WIN_DEV_CS0;
                break;
        case ORION_DEV1:
                target = TARGET_DEV_BUS;
                attr = ATTR_DEV_CS1;
                win = CPU_WIN_DEV_CS1;
                break;
        case ORION_DEV2:
                target = TARGET_DEV_BUS;
                attr = ATTR_DEV_CS2;
                win = CPU_WIN_DEV_CS2;
                break;
        case ORION_DDR:
        case ORION_REGS:
                /*
                 * Must be mapped by bootloader.
                 */
        default:
                target = attr = win = -1;
                BUG();
        }

        base &= 0xffff0000;
        ctrl = (((size - 1) & 0xffff0000) | (attr << 8) |
                (target << 4) | WIN_EN);

        orion_write(CPU_WIN_BASE(win), base);
        orion_write(CPU_WIN_CTRL(win), ctrl);

        if (orion_cpu_win_can_remap(win)) {
                if (remap >= 0) {
                        orion_write(CPU_WIN_REMAP_LO(win), remap & 0xffff0000);
                        orion_write(CPU_WIN_REMAP_HI(win), 0);
                } else {
                        orion_write(CPU_WIN_REMAP_LO(win), base);
                        orion_write(CPU_WIN_REMAP_HI(win), 0);
                }
        }
}

void __init orion_setup_cpu_wins(void)
{
        int i;

        /*
         * First, disable and clear windows
         */
        for (i = 0; i < CPU_MAX_WIN; i++) {
                orion_write(CPU_WIN_BASE(i), 0);
                orion_write(CPU_WIN_CTRL(i), 0);
                if (orion_cpu_win_can_remap(i)) {
                        orion_write(CPU_WIN_REMAP_LO(i), 0);
                        orion_write(CPU_WIN_REMAP_HI(i), 0);
                }
        }

        /*
         * Setup windows for PCI+PCIe IO+MEM space.
         */
        orion_setup_cpu_win(ORION_PCIE_IO, ORION_PCIE_IO_PHYS_BASE,
                                ORION_PCIE_IO_SIZE, ORION_PCIE_IO_BUS_BASE);
        orion_setup_cpu_win(ORION_PCI_IO, ORION_PCI_IO_PHYS_BASE,
                                ORION_PCI_IO_SIZE, ORION_PCI_IO_BUS_BASE);
        orion_setup_cpu_win(ORION_PCIE_MEM, ORION_PCIE_MEM_PHYS_BASE,
                                ORION_PCIE_MEM_SIZE, -1);
        orion_setup_cpu_win(ORION_PCI_MEM, ORION_PCI_MEM_PHYS_BASE,
                                ORION_PCI_MEM_SIZE, -1);
}

/*
 * Setup PCIE BARs and Address Decode Wins:
 * BAR[0,2] -> disabled, BAR[1] -> covers all DRAM banks
 * WIN[0-3] -> DRAM bank[0-3]
 */
void __init orion_setup_pcie_wins(void)
{
        u32 base, size, i;

        /*
         * First, disable and clear BARs and windows
         */
        for (i = 1; i < PCIE_MAX_BARS; i++) {
                orion_write(PCIE_BAR_CTRL(i), 0);
                orion_write(PCIE_BAR_LO(i), 0);
                orion_write(PCIE_BAR_HI(i), 0);
        }

        for (i = 0; i < PCIE_MAX_WINS; i++) {
                orion_write(PCIE_WIN_CTRL(i), 0);
                orion_write(PCIE_WIN_BASE(i), 0);
                orion_write(PCIE_WIN_REMAP(i), 0);
        }

        /*
         * Setup windows for DDR banks. Count total DDR size on the fly.
         */
        base = DDR_REG_TO_BASE(orion_read(DDR_BASE_CS(0)));
        size = 0;
        for (i = 0; i < DDR_MAX_CS; i++) {
                u32 bank_base, bank_size;
                bank_size = orion_read(DDR_SIZE_CS(i));
                bank_base = orion_read(DDR_BASE_CS(i));
                if (bank_size & DDR_BANK_EN) {
                        bank_size = DDR_REG_TO_SIZE(bank_size);
                        bank_base = DDR_REG_TO_BASE(bank_base);
                        orion_write(PCIE_WIN_BASE(i), bank_base & 0xffff0000);
                        orion_write(PCIE_WIN_REMAP(i), 0);
                        orion_write(PCIE_WIN_CTRL(i),
                                        ((bank_size-1) & 0xffff0000) |
                                        (ATTR_DDR_CS(i) << 8) |
                                        (TARGET_DDR << 4) |
                                        (PCIE_DRAM_BAR << 1) | WIN_EN);
                        size += bank_size;
                }
        }

        /*
         * Setup BAR[1] to all DRAM banks
         */
        orion_write(PCIE_BAR_LO(PCIE_DRAM_BAR), base & 0xffff0000);
        orion_write(PCIE_BAR_HI(PCIE_DRAM_BAR), 0);
        orion_write(PCIE_BAR_CTRL(PCIE_DRAM_BAR),
                                ((size - 1) & 0xffff0000) | WIN_EN);
}

void __init orion_setup_pci_wins(void)
{
        u32 base, size, i;

        /*
         * First, disable windows
         */
        orion_write(PCI_BAR_ENABLE, 0xffffffff);

        /*
         * Setup windows for DDR banks.
         */
        for (i = 0; i < DDR_MAX_CS; i++) {
                base = orion_read(DDR_BASE_CS(i));
                size = orion_read(DDR_SIZE_CS(i));
                if (size & DDR_BANK_EN) {
                        u32 bus, dev, func, reg, val;
                        size = DDR_REG_TO_SIZE(size);
                        base = DDR_REG_TO_BASE(base);
                        bus = orion_pci_local_bus_nr();
                        dev = orion_pci_local_dev_nr();
                        func = PCI_CONF_FUNC_BAR_CS(i);
                        reg = PCI_CONF_REG_BAR_LO_CS(i);
                        orion_pci_hw_rd_conf(bus, dev, func, reg, 4, &val);
                        orion_pci_hw_wr_conf(bus, dev, func, reg, 4,
                                        (base & 0xfffff000) | (val & 0xfff));
                        reg = PCI_CONF_REG_BAR_HI_CS(i);
                        orion_pci_hw_wr_conf(bus, dev, func, reg, 4, 0);
                        orion_write(PCI_BAR_SIZE_DDR_CS(i),
                                        (size - 1) & 0xfffff000);
                        orion_write(PCI_BAR_REMAP_DDR_CS(i),
                                        base & 0xfffff000);
                        orion_clrbits(PCI_BAR_ENABLE, (1 << i));
                }
        }

        /*
         * Disable automatic update of address remaping when writing to BARs
         */
        orion_setbits(PCI_ADDR_DECODE_CTRL, 1);
}

void __init orion_setup_usb_wins(void)
{
        int i;
        u32 usb_if, dev, rev;
        u32 max_usb_if = 1;

        orion_pcie_id(&dev, &rev);
        if (dev == MV88F5182_DEV_ID)
                max_usb_if = 2;

        for (usb_if = 0; usb_if < max_usb_if; usb_if++) {
                /*
                 * First, disable and clear windows
                 */
                for (i = 0; i < USB_MAX_WIN; i++) {
                        orion_write(USB_WIN_BASE(usb_if, i), 0);
                        orion_write(USB_WIN_CTRL(usb_if, i), 0);
                }

                /*
                 * Setup windows for DDR banks.
                 */
                for (i = 0; i < DDR_MAX_CS; i++) {
                        u32 base, size;
                        size = orion_read(DDR_SIZE_CS(i));
                        base = orion_read(DDR_BASE_CS(i));
                        if (size & DDR_BANK_EN) {
                                base = DDR_REG_TO_BASE(base);
                                size = DDR_REG_TO_SIZE(size);
                                orion_write(USB_WIN_CTRL(usb_if, i),
                                                ((size-1) & 0xffff0000) |
                                                (ATTR_DDR_CS(i) << 8) |
                                                (TARGET_DDR << 4) | WIN_EN);
                                orion_write(USB_WIN_BASE(usb_if, i),
                                                base & 0xffff0000);
                        }
                }
        }
}

void __init orion_setup_eth_wins(void)
{
        int i;

        /*
         * First, disable and clear windows
         */
        for (i = 0; i < ETH_MAX_WIN; i++) {
                orion_write(ETH_WIN_BASE(i), 0);
                orion_write(ETH_WIN_SIZE(i), 0);
                orion_setbits(ETH_WIN_EN, 1 << i);
                orion_clrbits(ETH_WIN_PROT, 0x3 << (i * 2));
                if (i < ETH_MAX_REMAP_WIN)
                        orion_write(ETH_WIN_REMAP(i), 0);
        }

        /*
         * Setup windows for DDR banks.
         */
        for (i = 0; i < DDR_MAX_CS; i++) {
                u32 base, size;
                size = orion_read(DDR_SIZE_CS(i));
                base = orion_read(DDR_BASE_CS(i));
                if (size & DDR_BANK_EN) {
                        base = DDR_REG_TO_BASE(base);
                        size = DDR_REG_TO_SIZE(size);
                        orion_write(ETH_WIN_SIZE(i), (size-1) & 0xffff0000);
                        orion_write(ETH_WIN_BASE(i), (base & 0xffff0000) |
                                        (ATTR_DDR_CS(i) << 8) |
                                        TARGET_DDR);
                        orion_clrbits(ETH_WIN_EN, 1 << i);
                        orion_setbits(ETH_WIN_PROT, 0x3 << (i * 2));
                }
        }
}

void __init orion_setup_sata_wins(void)
{
        int i;

        /*
         * First, disable and clear windows
         */
        for (i = 0; i < SATA_MAX_WIN; i++) {
                orion_write(SATA_WIN_BASE(i), 0);
                orion_write(SATA_WIN_CTRL(i), 0);
        }

        /*
         * Setup windows for DDR banks.
         */
        for (i = 0; i < DDR_MAX_CS; i++) {
                u32 base, size;
                size = orion_read(DDR_SIZE_CS(i));
                base = orion_read(DDR_BASE_CS(i));
                if (size & DDR_BANK_EN) {
                        base = DDR_REG_TO_BASE(base);
                        size = DDR_REG_TO_SIZE(size);
                        orion_write(SATA_WIN_CTRL(i),
                                        ((size-1) & 0xffff0000) |
                                        (ATTR_DDR_CS(i) << 8) |
                                        (TARGET_DDR << 4) | WIN_EN);
                        orion_write(SATA_WIN_BASE(i),
                                        base & 0xffff0000);
                }
        }
}