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[linux-ginger.git] / arch / powerpc / platforms / iseries / dt.c

/*
 *    Copyright (C) 2005-2006 Michael Ellerman, IBM Corporation
 *    Copyright (C) 2000-2004, IBM Corporation
 *
 *    Description:
 *      This file contains all the routines to build a flattened device
 *      tree for a legacy iSeries machine.
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#undef DEBUG

#include <linux/types.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pci_regs.h>
#include <linux/pci_ids.h>
#include <linux/threads.h>
#include <linux/bitops.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/if_ether.h>     /* ETH_ALEN */

#include <asm/machdep.h>
#include <asm/prom.h>
#include <asm/lppaca.h>
#include <asm/cputable.h>
#include <asm/abs_addr.h>
#include <asm/system.h>
#include <asm/iseries/hv_types.h>
#include <asm/iseries/hv_lp_config.h>
#include <asm/iseries/hv_call_xm.h>
#include <asm/udbg.h>

#include "processor_vpd.h"
#include "call_hpt.h"
#include "call_pci.h"
#include "pci.h"
#include "it_exp_vpd_panel.h"
#include "naca.h"

#ifdef DEBUG
#define DBG(fmt...) udbg_printf(fmt)
#else
#define DBG(fmt...)
#endif

/*
 * These are created by the linker script at the start and end
 * of the section containing all the strings from this file.
 */
extern char __dt_strings_start[];
extern char __dt_strings_end[];

struct iseries_flat_dt {
        struct boot_param_header header;
        u64 reserve_map[2];
};

static void * __initdata dt_data;

/*
 * Putting these strings here keeps them out of the section
 * that we rename to .dt_strings using objcopy and capture
 * for the strings blob of the flattened device tree.
 */
static char __initdata device_type_cpu[] = "cpu";
static char __initdata device_type_memory[] = "memory";
static char __initdata device_type_serial[] = "serial";
static char __initdata device_type_network[] = "network";
static char __initdata device_type_pci[] = "pci";
static char __initdata device_type_vdevice[] = "vdevice";
static char __initdata device_type_vscsi[] = "vscsi";


/* EBCDIC to ASCII conversion routines */

static unsigned char __init e2a(unsigned char x)
{
        switch (x) {
        case 0x81 ... 0x89:
                return x - 0x81 + 'a';
        case 0x91 ... 0x99:
                return x - 0x91 + 'j';
        case 0xA2 ... 0xA9:
                return x - 0xA2 + 's';
        case 0xC1 ... 0xC9:
                return x - 0xC1 + 'A';
        case 0xD1 ... 0xD9:
                return x - 0xD1 + 'J';
        case 0xE2 ... 0xE9:
                return x - 0xE2 + 'S';
        case 0xF0 ... 0xF9:
                return x - 0xF0 + '0';
        }
        return ' ';
}

static unsigned char * __init strne2a(unsigned char *dest,
                const unsigned char *src, size_t n)
{
        int i;

        n = strnlen(src, n);

        for (i = 0; i < n; i++)
                dest[i] = e2a(src[i]);

        return dest;
}

static struct iseries_flat_dt * __init dt_init(void)
{
        struct iseries_flat_dt *dt;
        unsigned long str_len;

        str_len = __dt_strings_end - __dt_strings_start;
        dt = (struct iseries_flat_dt *)ALIGN(klimit, 8);
        dt->header.off_mem_rsvmap =
                offsetof(struct iseries_flat_dt, reserve_map);
        dt->header.off_dt_strings = ALIGN(sizeof(*dt), 8);
        dt->header.off_dt_struct = dt->header.off_dt_strings
                + ALIGN(str_len, 8);
        dt_data = (void *)((unsigned long)dt + dt->header.off_dt_struct);
        dt->header.dt_strings_size = str_len;

        /* There is no notion of hardware cpu id on iSeries */
        dt->header.boot_cpuid_phys = smp_processor_id();

        memcpy((char *)dt + dt->header.off_dt_strings, __dt_strings_start,
                        str_len);

        dt->header.magic = OF_DT_HEADER;
        dt->header.version = 0x10;
        dt->header.last_comp_version = 0x10;

        dt->reserve_map[0] = 0;
        dt->reserve_map[1] = 0;

        return dt;
}

static void __init dt_push_u32(struct iseries_flat_dt *dt, u32 value)
{
        *((u32 *)dt_data) = value;
        dt_data += sizeof(u32);
}

#ifdef notyet
static void __init dt_push_u64(struct iseries_flat_dt *dt, u64 value)
{
        *((u64 *)dt_data) = value;
        dt_data += sizeof(u64);
}
#endif

static void __init dt_push_bytes(struct iseries_flat_dt *dt, const char *data,
                int len)
{
        memcpy(dt_data, data, len);
        dt_data += ALIGN(len, 4);
}

static void __init dt_start_node(struct iseries_flat_dt *dt, const char *name)
{
        dt_push_u32(dt, OF_DT_BEGIN_NODE);
        dt_push_bytes(dt, name, strlen(name) + 1);
}

#define dt_end_node(dt) dt_push_u32(dt, OF_DT_END_NODE)

static void __init dt_prop(struct iseries_flat_dt *dt, const char *name,
                const void *data, int len)
{
        unsigned long offset;

        dt_push_u32(dt, OF_DT_PROP);

        /* Length of the data */
        dt_push_u32(dt, len);

        offset = name - __dt_strings_start;

        /* The offset of the properties name in the string blob. */
        dt_push_u32(dt, (u32)offset);

        /* The actual data. */
        dt_push_bytes(dt, data, len);
}

static void __init dt_prop_str(struct iseries_flat_dt *dt, const char *name,
                const char *data)
{
        dt_prop(dt, name, data, strlen(data) + 1); /* + 1 for NULL */
}

static void __init dt_prop_u32(struct iseries_flat_dt *dt, const char *name,
                u32 data)
{
        dt_prop(dt, name, &data, sizeof(u32));
}

static void __init __maybe_unused dt_prop_u64(struct iseries_flat_dt *dt,
                                              const char *name,
                u64 data)
{
        dt_prop(dt, name, &data, sizeof(u64));
}

static void __init dt_prop_u64_list(struct iseries_flat_dt *dt,
                const char *name, u64 *data, int n)
{
        dt_prop(dt, name, data, sizeof(u64) * n);
}

static void __init dt_prop_u32_list(struct iseries_flat_dt *dt,
                const char *name, u32 *data, int n)
{
        dt_prop(dt, name, data, sizeof(u32) * n);
}

#ifdef notyet
static void __init dt_prop_empty(struct iseries_flat_dt *dt, const char *name)
{
        dt_prop(dt, name, NULL, 0);
}
#endif

static void __init dt_cpus(struct iseries_flat_dt *dt)
{
        unsigned char buf[32];
        unsigned char *p;
        unsigned int i, index;
        struct IoHriProcessorVpd *d;
        u32 pft_size[2];

        /* yuck */
        snprintf(buf, 32, "PowerPC,%s", cur_cpu_spec->cpu_name);
        p = strchr(buf, ' ');
        if (!p) p = buf + strlen(buf);

        dt_start_node(dt, "cpus");
        dt_prop_u32(dt, "#address-cells", 1);
        dt_prop_u32(dt, "#size-cells", 0);

        pft_size[0] = 0; /* NUMA CEC cookie, 0 for non NUMA  */
        pft_size[1] = __ilog2(HvCallHpt_getHptPages() * HW_PAGE_SIZE);

        for (i = 0; i < NR_CPUS; i++) {
                if (lppaca[i].dyn_proc_status >= 2)
                        continue;

                snprintf(p, 32 - (p - buf), "@%d", i);
                dt_start_node(dt, buf);

                dt_prop_str(dt, "device_type", device_type_cpu);

                index = lppaca[i].dyn_hv_phys_proc_index;
                d = &xIoHriProcessorVpd[index];

                dt_prop_u32(dt, "i-cache-size", d->xInstCacheSize * 1024);
                dt_prop_u32(dt, "i-cache-line-size", d->xInstCacheOperandSize);

                dt_prop_u32(dt, "d-cache-size", d->xDataL1CacheSizeKB * 1024);
                dt_prop_u32(dt, "d-cache-line-size", d->xDataCacheOperandSize);

                /* magic conversions to Hz copied from old code */
                dt_prop_u32(dt, "clock-frequency",
                        ((1UL << 34) * 1000000) / d->xProcFreq);
                dt_prop_u32(dt, "timebase-frequency",
                        ((1UL << 32) * 1000000) / d->xTimeBaseFreq);

                dt_prop_u32(dt, "reg", i);

                dt_prop_u32_list(dt, "ibm,pft-size", pft_size, 2);

                dt_end_node(dt);
        }

        dt_end_node(dt);
}

static void __init dt_model(struct iseries_flat_dt *dt)
{
        char buf[16] = "IBM,";

        /* N.B. lparcfg.c knows about the "IBM," prefixes ... */
        /* "IBM," + mfgId[2:3] + systemSerial[1:5] */
        strne2a(buf + 4, xItExtVpdPanel.mfgID + 2, 2);
        strne2a(buf + 6, xItExtVpdPanel.systemSerial + 1, 5);
        buf[11] = '\0';
        dt_prop_str(dt, "system-id", buf);

        /* "IBM," + machineType[0:4] */
        strne2a(buf + 4, xItExtVpdPanel.machineType, 4);
        buf[8] = '\0';
        dt_prop_str(dt, "model", buf);

        dt_prop_str(dt, "compatible", "IBM,iSeries");
        dt_prop_u32(dt, "ibm,partition-no", HvLpConfig_getLpIndex());
}

static void __init dt_initrd(struct iseries_flat_dt *dt)
{
#ifdef CONFIG_BLK_DEV_INITRD
        if (naca.xRamDisk) {
                dt_prop_u64(dt, "linux,initrd-start", (u64)naca.xRamDisk);
                dt_prop_u64(dt, "linux,initrd-end",
                        (u64)naca.xRamDisk + naca.xRamDiskSize * HW_PAGE_SIZE);
        }
#endif
}

static void __init dt_do_vdevice(struct iseries_flat_dt *dt,
                const char *name, u32 reg, int unit,
                const char *type, const char *compat, int end)
{
        char buf[32];

        snprintf(buf, 32, "%s@%08x", name, reg + ((unit >= 0) ? unit : 0));
        dt_start_node(dt, buf);
        dt_prop_str(dt, "device_type", type);
        if (compat)
                dt_prop_str(dt, "compatible", compat);
        dt_prop_u32(dt, "reg", reg + ((unit >= 0) ? unit : 0));
        if (unit >= 0)
                dt_prop_u32(dt, "linux,unit_address", unit);
        if (end)
                dt_end_node(dt);
}

static void __init dt_vdevices(struct iseries_flat_dt *dt)
{
        u32 reg = 0;
        HvLpIndexMap vlan_map;
        int i;

        dt_start_node(dt, "vdevice");
        dt_prop_str(dt, "device_type", device_type_vdevice);
        dt_prop_str(dt, "compatible", "IBM,iSeries-vdevice");
        dt_prop_u32(dt, "#address-cells", 1);
        dt_prop_u32(dt, "#size-cells", 0);

        dt_do_vdevice(dt, "vty", reg, -1, device_type_serial,
                        "IBM,iSeries-vty", 1);
        reg++;

        dt_do_vdevice(dt, "v-scsi", reg, -1, device_type_vscsi,
                        "IBM,v-scsi", 1);
        reg++;

        vlan_map = HvLpConfig_getVirtualLanIndexMap();
        for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
                unsigned char mac_addr[ETH_ALEN];

                if ((vlan_map & (0x8000 >> i)) == 0)
                        continue;
                dt_do_vdevice(dt, "l-lan", reg, i, device_type_network,
                                "IBM,iSeries-l-lan", 0);
                mac_addr[0] = 0x02;
                mac_addr[1] = 0x01;
                mac_addr[2] = 0xff;
                mac_addr[3] = i;
                mac_addr[4] = 0xff;
                mac_addr[5] = HvLpConfig_getLpIndex_outline();
                dt_prop(dt, "local-mac-address", (char *)mac_addr, ETH_ALEN);
                dt_prop(dt, "mac-address", (char *)mac_addr, ETH_ALEN);
                dt_prop_u32(dt, "max-frame-size", 9000);
                dt_prop_u32(dt, "address-bits", 48);

                dt_end_node(dt);
        }

        dt_end_node(dt);
}

struct pci_class_name {
        u16 code;
        const char *name;
        const char *type;
};

static struct pci_class_name __initdata pci_class_name[] = {
        { PCI_CLASS_NETWORK_ETHERNET, "ethernet", device_type_network },
};

static struct pci_class_name * __init dt_find_pci_class_name(u16 class_code)
{
        struct pci_class_name *cp;

        for (cp = pci_class_name;
                        cp < &pci_class_name[ARRAY_SIZE(pci_class_name)]; cp++)
                if (cp->code == class_code)
                        return cp;
        return NULL;
}

/*
 * This assumes that the node slot is always on the primary bus!
 */
static void __init scan_bridge_slot(struct iseries_flat_dt *dt,
                HvBusNumber bus, struct HvCallPci_BridgeInfo *bridge_info)
{
        HvSubBusNumber sub_bus = bridge_info->subBusNumber;
        u16 vendor_id;
        u16 device_id;
        u32 class_id;
        int err;
        char buf[32];
        u32 reg[5];
        int id_sel = ISERIES_GET_DEVICE_FROM_SUBBUS(sub_bus);
        int function = ISERIES_GET_FUNCTION_FROM_SUBBUS(sub_bus);
        HvAgentId eads_id_sel = ISERIES_PCI_AGENTID(id_sel, function);
        u8 devfn;
        struct pci_class_name *cp;

        /*
         * Connect all functions of any device found.
         */
        for (id_sel = 1; id_sel <= bridge_info->maxAgents; id_sel++) {
                for (function = 0; function < 8; function++) {
                        HvAgentId agent_id = ISERIES_PCI_AGENTID(id_sel,
                                        function);
                        err = HvCallXm_connectBusUnit(bus, sub_bus,
                                        agent_id, 0);
                        if (err) {
                                if (err != 0x302)
                                        DBG("connectBusUnit(%x, %x, %x) %x\n",
                                                bus, sub_bus, agent_id, err);
                                continue;
                        }

                        err = HvCallPci_configLoad16(bus, sub_bus, agent_id,
                                        PCI_VENDOR_ID, &vendor_id);
                        if (err) {
                                DBG("ReadVendor(%x, %x, %x) %x\n",
                                        bus, sub_bus, agent_id, err);
                                continue;
                        }
                        err = HvCallPci_configLoad16(bus, sub_bus, agent_id,
                                        PCI_DEVICE_ID, &device_id);
                        if (err) {
                                DBG("ReadDevice(%x, %x, %x) %x\n",
                                        bus, sub_bus, agent_id, err);
                                continue;
                        }
                        err = HvCallPci_configLoad32(bus, sub_bus, agent_id,
                                        PCI_CLASS_REVISION , &class_id);
                        if (err) {
                                DBG("ReadClass(%x, %x, %x) %x\n",
                                        bus, sub_bus, agent_id, err);
                                continue;
                        }

                        devfn = PCI_DEVFN(ISERIES_ENCODE_DEVICE(eads_id_sel),
                                        function);
                        cp = dt_find_pci_class_name(class_id >> 16);
                        if (cp && cp->name)
                                strncpy(buf, cp->name, sizeof(buf) - 1);
                        else
                                snprintf(buf, sizeof(buf), "pci%x,%x",
                                                vendor_id, device_id);
                        buf[sizeof(buf) - 1] = '\0';
                        snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
                                        "@%x", PCI_SLOT(devfn));
                        buf[sizeof(buf) - 1] = '\0';
                        if (function != 0)
                                snprintf(buf + strlen(buf),
                                        sizeof(buf) - strlen(buf),
                                        ",%x", function);
                        dt_start_node(dt, buf);
                        reg[0] = (bus << 16) | (devfn << 8);
                        reg[1] = 0;
                        reg[2] = 0;
                        reg[3] = 0;
                        reg[4] = 0;
                        dt_prop_u32_list(dt, "reg", reg, 5);
                        if (cp && (cp->type || cp->name))
                                dt_prop_str(dt, "device_type",
                                        cp->type ? cp->type : cp->name);
                        dt_prop_u32(dt, "vendor-id", vendor_id);
                        dt_prop_u32(dt, "device-id", device_id);
                        dt_prop_u32(dt, "class-code", class_id >> 8);
                        dt_prop_u32(dt, "revision-id", class_id & 0xff);
                        dt_prop_u32(dt, "linux,subbus", sub_bus);
                        dt_prop_u32(dt, "linux,agent-id", agent_id);
                        dt_prop_u32(dt, "linux,logical-slot-number",
                                        bridge_info->logicalSlotNumber);
                        dt_end_node(dt);

                }
        }
}

static void __init scan_bridge(struct iseries_flat_dt *dt, HvBusNumber bus,
                HvSubBusNumber sub_bus, int id_sel)
{
        struct HvCallPci_BridgeInfo bridge_info;
        HvAgentId agent_id;
        int function;
        int ret;

        /* Note: hvSubBus and irq is always be 0 at this level! */
        for (function = 0; function < 8; ++function) {
                agent_id = ISERIES_PCI_AGENTID(id_sel, function);
                ret = HvCallXm_connectBusUnit(bus, sub_bus, agent_id, 0);
                if (ret != 0) {
                        if (ret != 0xb)
                                DBG("connectBusUnit(%x, %x, %x) %x\n",
                                                bus, sub_bus, agent_id, ret);
                        continue;
                }
                DBG("found device at bus %d idsel %d func %d (AgentId %x)\n",
                                bus, id_sel, function, agent_id);
                ret = HvCallPci_getBusUnitInfo(bus, sub_bus, agent_id,
                                iseries_hv_addr(&bridge_info),
                                sizeof(struct HvCallPci_BridgeInfo));
                if (ret != 0)
                        continue;
                DBG("bridge info: type %x subbus %x "
                        "maxAgents %x maxsubbus %x logslot %x\n",
                        bridge_info.busUnitInfo.deviceType,
                        bridge_info.subBusNumber,
                        bridge_info.maxAgents,
                        bridge_info.maxSubBusNumber,
                        bridge_info.logicalSlotNumber);
                if (bridge_info.busUnitInfo.deviceType ==
                                HvCallPci_BridgeDevice)
                        scan_bridge_slot(dt, bus, &bridge_info);
                else
                        DBG("PCI: Invalid Bridge Configuration(0x%02X)",
                                bridge_info.busUnitInfo.deviceType);
        }
}

static void __init scan_phb(struct iseries_flat_dt *dt, HvBusNumber bus)
{
        struct HvCallPci_DeviceInfo dev_info;
        const HvSubBusNumber sub_bus = 0;       /* EADs is always 0. */
        int err;
        int id_sel;
        const int max_agents = 8;

        /*
         * Probe for EADs Bridges
         */
        for (id_sel = 1; id_sel < max_agents; ++id_sel) {
                err = HvCallPci_getDeviceInfo(bus, sub_bus, id_sel,
                                iseries_hv_addr(&dev_info),
                                sizeof(struct HvCallPci_DeviceInfo));
                if (err) {
                        if (err != 0x302)
                                DBG("getDeviceInfo(%x, %x, %x) %x\n",
                                                bus, sub_bus, id_sel, err);
                        continue;
                }
                if (dev_info.deviceType != HvCallPci_NodeDevice) {
                        DBG("PCI: Invalid System Configuration"
                                        "(0x%02X) for bus 0x%02x id 0x%02x.\n",
                                        dev_info.deviceType, bus, id_sel);
                        continue;
                }
                scan_bridge(dt, bus, sub_bus, id_sel);
        }
}

static void __init dt_pci_devices(struct iseries_flat_dt *dt)
{
        HvBusNumber bus;
        char buf[32];
        u32 buses[2];
        int phb_num = 0;

        /* Check all possible buses. */
        for (bus = 0; bus < 256; bus++) {
                int err = HvCallXm_testBus(bus);

                if (err) {
                        /*
                         * Check for Unexpected Return code, a clue that
                         * something has gone wrong.
                         */
                        if (err != 0x0301)
                                DBG("Unexpected Return on Probe(0x%02X) "
                                                "0x%04X\n", bus, err);
                        continue;
                }
                DBG("bus %d appears to exist\n", bus);
                snprintf(buf, 32, "pci@%d", phb_num);
                dt_start_node(dt, buf);
                dt_prop_str(dt, "device_type", device_type_pci);
                dt_prop_str(dt, "compatible", "IBM,iSeries-Logical-PHB");
                dt_prop_u32(dt, "#address-cells", 3);
                dt_prop_u32(dt, "#size-cells", 2);
                buses[0] = buses[1] = bus;
                dt_prop_u32_list(dt, "bus-range", buses, 2);
                scan_phb(dt, bus);
                dt_end_node(dt);
                phb_num++;
        }
}

static void dt_finish(struct iseries_flat_dt *dt)
{
        dt_push_u32(dt, OF_DT_END);
        dt->header.totalsize = (unsigned long)dt_data - (unsigned long)dt;
        klimit = ALIGN((unsigned long)dt_data, 8);
}

void * __init build_flat_dt(unsigned long phys_mem_size)
{
        struct iseries_flat_dt *iseries_dt;
        u64 tmp[2];

        iseries_dt = dt_init();

        dt_start_node(iseries_dt, "");

        dt_prop_u32(iseries_dt, "#address-cells", 2);
        dt_prop_u32(iseries_dt, "#size-cells", 2);
        dt_model(iseries_dt);

        /* /memory */
        dt_start_node(iseries_dt, "memory@0");
        dt_prop_str(iseries_dt, "device_type", device_type_memory);
        tmp[0] = 0;
        tmp[1] = phys_mem_size;
        dt_prop_u64_list(iseries_dt, "reg", tmp, 2);
        dt_end_node(iseries_dt);

        /* /chosen */
        dt_start_node(iseries_dt, "chosen");
        dt_prop_str(iseries_dt, "bootargs", cmd_line);
        dt_initrd(iseries_dt);
        dt_end_node(iseries_dt);

        dt_cpus(iseries_dt);

        dt_vdevices(iseries_dt);
        dt_pci_devices(iseries_dt);

        dt_end_node(iseries_dt);

        dt_finish(iseries_dt);

        return iseries_dt;
}