setup.c

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/*
 *  Powermac setup and early boot code plus other random bits.
 *
 *  PowerPC version
 *    Copyright (C) 1995-1996 Gary Thomas ([email protected])
 *
 *  Adapted for Power Macintosh by Paul Mackerras
 *    Copyright (C) 1996 Paul Mackerras ([email protected])
 *
 *  Derived from "arch/alpha/kernel/setup.c"
 *    Copyright (C) 1995 Linus Torvalds
 *
 *  Maintained by Benjamin Herrenschmidt ([email protected])
 *
 *  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.
 *
 */

/*
 * bootup setup stuff..
 */

#include <linux/init.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/export.h>
#include <linux/user.h>
#include <linux/tty.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/major.h>
#include <linux/initrd.h>
#include <linux/vt_kern.h>
#include <linux/console.h>
#include <linux/pci.h>
#include <linux/adb.h>
#include <linux/cuda.h>
#include <linux/pmu.h>
#include <linux/irq.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/bitops.h>
#include <linux/suspend.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/memblock.h>

#include <asm/reg.h>
#include <asm/sections.h>
#include <asm/prom.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/pci-bridge.h>
#include <asm/ohare.h>
#include <asm/mediabay.h>
#include <asm/machdep.h>
#include <asm/dma.h>
#include <asm/cputable.h>
#include <asm/btext.h>
#include <asm/pmac_feature.h>
#include <asm/time.h>
#include <asm/mmu_context.h>
#include <asm/iommu.h>
#include <asm/smu.h>
#include <asm/pmc.h>
#include <asm/udbg.h>

#include "pmac.h"

#undef SHOW_GATWICK_IRQS

int ppc_override_l2cr = 0;
int ppc_override_l2cr_value;
int has_l2cache = 0;

int pmac_newworld;

static int current_root_goodness = -1;

extern struct machdep_calls pmac_md;

#define DEFAULT_ROOT_DEVICE Root_SDA1   /* sda1 - slightly silly choice */

#ifdef CONFIG_PPC64
int sccdbg;
#endif

sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
EXPORT_SYMBOL(sys_ctrler);

#ifdef CONFIG_PMAC_SMU
unsigned long smu_cmdbuf_abs;
EXPORT_SYMBOL(smu_cmdbuf_abs);
#endif

static void pmac_show_cpuinfo(struct seq_file *m)
{
    struct device_node *np;
    const char *pp;
    int plen;
    int mbmodel;
    unsigned int mbflags;
    char* mbname;

    mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
                    PMAC_MB_INFO_MODEL, 0);
    mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
                    PMAC_MB_INFO_FLAGS, 0);
    if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
                  (long) &mbname) != 0)
        mbname = "Unknown";

    /* find motherboard type */
    seq_printf(m, "machine\t\t: ");
    np = of_find_node_by_path("/");
    if (np != NULL) {
        pp = of_get_property(np, "model", NULL);
        if (pp != NULL)
            seq_printf(m, "%s\n", pp);
        else
            seq_printf(m, "PowerMac\n");
        pp = of_get_property(np, "compatible", &plen);
        if (pp != NULL) {
            seq_printf(m, "motherboard\t:");
            while (plen > 0) {
                int l = strlen(pp) + 1;
                seq_printf(m, " %s", pp);
                plen -= l;
                pp += l;
            }
            seq_printf(m, "\n");
        }
        of_node_put(np);
    } else
        seq_printf(m, "PowerMac\n");

    /* print parsed model */
    seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
    seq_printf(m, "pmac flags\t: %08x\n", mbflags);

    /* find l2 cache info */
    np = of_find_node_by_name(NULL, "l2-cache");
    if (np == NULL)
        np = of_find_node_by_type(NULL, "cache");
    if (np != NULL) {
        const unsigned int *ic =
            of_get_property(np, "i-cache-size", NULL);
        const unsigned int *dc =
            of_get_property(np, "d-cache-size", NULL);
        seq_printf(m, "L2 cache\t:");
        has_l2cache = 1;
        if (of_get_property(np, "cache-unified", NULL) != 0 && dc) {
            seq_printf(m, " %dK unified", *dc / 1024);
        } else {
            if (ic)
                seq_printf(m, " %dK instruction", *ic / 1024);
            if (dc)
                seq_printf(m, "%s %dK data",
                       (ic? " +": ""), *dc / 1024);
        }
        pp = of_get_property(np, "ram-type", NULL);
        if (pp)
            seq_printf(m, " %s", pp);
        seq_printf(m, "\n");
        of_node_put(np);
    }

    /* Indicate newworld/oldworld */
    seq_printf(m, "pmac-generation\t: %s\n",
           pmac_newworld ? "NewWorld" : "OldWorld");
}

#ifndef CONFIG_ADB_CUDA
int find_via_cuda(void)
{
    struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");

    if (!dn)
        return 0;
    of_node_put(dn);
    printk("WARNING ! Your machine is CUDA-based but your kernel\n");
    printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
    return 0;
}
#endif

#ifndef CONFIG_ADB_PMU
int find_via_pmu(void)
{
    struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");

    if (!dn)
        return 0;
    of_node_put(dn);
    printk("WARNING ! Your machine is PMU-based but your kernel\n");
    printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
    return 0;
}
#endif

#ifndef CONFIG_PMAC_SMU
int smu_init(void)
{
    /* should check and warn if SMU is present */
    return 0;
}
#endif

#ifdef CONFIG_PPC32
static volatile u32 *sysctrl_regs;

static void __init ohare_init(void)
{
    struct device_node *dn;

    /* this area has the CPU identification register
       and some registers used by smp boards */
    sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);

    /*
     * Turn on the L2 cache.
     * We assume that we have a PSX memory controller iff
     * we have an ohare I/O controller.
     */
    dn = of_find_node_by_name(NULL, "ohare");
    if (dn) {
        of_node_put(dn);
        if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
            if (sysctrl_regs[4] & 0x10)
                sysctrl_regs[4] |= 0x04000020;
            else
                sysctrl_regs[4] |= 0x04000000;
            if(has_l2cache)
                printk(KERN_INFO "Level 2 cache enabled\n");
        }
    }
}

static void __init l2cr_init(void)
{
    /* Checks "l2cr-value" property in the registry */
    if (cpu_has_feature(CPU_FTR_L2CR)) {
        struct device_node *np = of_find_node_by_name(NULL, "cpus");
        if (np == 0)
            np = of_find_node_by_type(NULL, "cpu");
        if (np != 0) {
            const unsigned int *l2cr =
                of_get_property(np, "l2cr-value", NULL);
            if (l2cr != 0) {
                ppc_override_l2cr = 1;
                ppc_override_l2cr_value = *l2cr;
                _set_L2CR(0);
                _set_L2CR(ppc_override_l2cr_value);
            }
            of_node_put(np);
        }
    }

    if (ppc_override_l2cr)
        printk(KERN_INFO "L2CR overridden (0x%x), "
               "backside cache is %s\n",
               ppc_override_l2cr_value,
               (ppc_override_l2cr_value & 0x80000000)
                ? "enabled" : "disabled");
}
#endif

static void __init pmac_setup_arch(void)
{
    struct device_node *cpu, *ic;
    const int *fp;
    unsigned long pvr;

    pvr = PVR_VER(mfspr(SPRN_PVR));

    /* Set loops_per_jiffy to a half-way reasonable value,
       for use until calibrate_delay gets called. */
    loops_per_jiffy = 50000000 / HZ;
    cpu = of_find_node_by_type(NULL, "cpu");
    if (cpu != NULL) {
        fp = of_get_property(cpu, "clock-frequency", NULL);
        if (fp != NULL) {
            if (pvr >= 0x30 && pvr < 0x80)
                /* PPC970 etc. */
                loops_per_jiffy = *fp / (3 * HZ);
            else if (pvr == 4 || pvr >= 8)
                /* 604, G3, G4 etc. */
                loops_per_jiffy = *fp / HZ;
            else
                /* 601, 603, etc. */
                loops_per_jiffy = *fp / (2 * HZ);
        }
        of_node_put(cpu);
    }

    /* See if newworld or oldworld */
    ic = of_find_node_with_property(NULL, "interrupt-controller");
    if (ic) {
        pmac_newworld = 1;
        of_node_put(ic);
    }

    /* Lookup PCI hosts */
    pmac_pci_init();

#ifdef CONFIG_PPC32
    ohare_init();
    l2cr_init();
#endif /* CONFIG_PPC32 */

    find_via_cuda();
    find_via_pmu();
    smu_init();

#if defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) || \
    defined(CONFIG_PPC64)
    pmac_nvram_init();
#endif

#ifdef CONFIG_PPC32
#ifdef CONFIG_BLK_DEV_INITRD
    if (initrd_start)
        ROOT_DEV = Root_RAM0;
    else
#endif
        ROOT_DEV = DEFAULT_ROOT_DEVICE;
#endif

#ifdef CONFIG_ADB
    if (strstr(cmd_line, "adb_sync")) {
        extern int __adb_probe_sync;
        __adb_probe_sync = 1;
    }
#endif /* CONFIG_ADB */
}

#ifdef CONFIG_SCSI
void note_scsi_host(struct device_node *node, void *host)
{
}
EXPORT_SYMBOL(note_scsi_host);
#endif

static int initializing = 1;

static int pmac_late_init(void)
{
    initializing = 0;
    return 0;
}
machine_late_initcall(powermac, pmac_late_init);

/*
 * This is __init_refok because we check for "initializing" before
 * touching any of the __init sensitive things and "initializing"
 * will be false after __init time. This can't be __init because it
 * can be called whenever a disk is first accessed.
 */
void __init_refok note_bootable_part(dev_t dev, int part, int goodness)
{
    char *p;

    if (!initializing)
        return;
    if ((goodness <= current_root_goodness) &&
        ROOT_DEV != DEFAULT_ROOT_DEVICE)
        return;
    p = strstr(boot_command_line, "root=");
    if (p != NULL && (p == boot_command_line || p[-1] == ' '))
        return;

    ROOT_DEV = dev + part;
    current_root_goodness = goodness;
}

#ifdef CONFIG_ADB_CUDA
static void cuda_restart(void)
{
    struct adb_request req;

    cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
    for (;;)
        cuda_poll();
}

static void cuda_shutdown(void)
{
    struct adb_request req;

    cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
    for (;;)
        cuda_poll();
}

#else
#define cuda_restart()
#define cuda_shutdown()
#endif

#ifndef CONFIG_ADB_PMU
#define pmu_restart()
#define pmu_shutdown()
#endif

#ifndef CONFIG_PMAC_SMU
#define smu_restart()
#define smu_shutdown()
#endif

static void pmac_restart(char *cmd)
{
    switch (sys_ctrler) {
    case SYS_CTRLER_CUDA:
        cuda_restart();
        break;
    case SYS_CTRLER_PMU:
        pmu_restart();
        break;
    case SYS_CTRLER_SMU:
        smu_restart();
        break;
    default: ;
    }
}

static void pmac_power_off(void)
{
    switch (sys_ctrler) {
    case SYS_CTRLER_CUDA:
        cuda_shutdown();
        break;
    case SYS_CTRLER_PMU:
        pmu_shutdown();
        break;
    case SYS_CTRLER_SMU:
        smu_shutdown();
        break;
    default: ;
    }
}

static void
pmac_halt(void)
{
    pmac_power_off();
}

/* 
 * Early initialization.
 */
static void __init pmac_init_early(void)
{
    /* Enable early btext debug if requested */
    if (strstr(cmd_line, "btextdbg")) {
        udbg_adb_init_early();
        register_early_udbg_console();
    }

    /* Probe motherboard chipset */
    pmac_feature_init();

    /* Initialize debug stuff */
    udbg_scc_init(!!strstr(cmd_line, "sccdbg"));
    udbg_adb_init(!!strstr(cmd_line, "btextdbg"));

#ifdef CONFIG_PPC64
    iommu_init_early_dart();
#endif

    /* SMP Init has to be done early as we need to patch up
     * cpu_possible_mask before interrupt stacks are allocated
     * or kaboom...
     */
#ifdef CONFIG_SMP
    pmac_setup_smp();
#endif
}

static int __init pmac_declare_of_platform_devices(void)
{
    struct device_node *np;

    if (machine_is(chrp))
        return -1;

    np = of_find_node_by_name(NULL, "valkyrie");
    if (np) {
        of_platform_device_create(np, "valkyrie", NULL);
        of_node_put(np);
    }
    np = of_find_node_by_name(NULL, "platinum");
    if (np) {
        of_platform_device_create(np, "platinum", NULL);
        of_node_put(np);
    }
        np = of_find_node_by_type(NULL, "smu");
        if (np) {
        of_platform_device_create(np, "smu", NULL);
        of_node_put(np);
    }
    np = of_find_node_by_type(NULL, "fcu");
    if (np == NULL) {
        /* Some machines have strangely broken device-tree */
        np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
    }
    if (np) {
        of_platform_device_create(np, "temperature", NULL);
        of_node_put(np);
    }

    return 0;
}
machine_device_initcall(powermac, pmac_declare_of_platform_devices);

#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
/*
 * This is called very early, as part of console_init() (typically just after
 * time_init()). This function is respondible for trying to find a good
 * default console on serial ports. It tries to match the open firmware
 * default output with one of the available serial console drivers.
 */
static int __init check_pmac_serial_console(void)
{
    struct device_node *prom_stdout = NULL;
    int offset = 0;
    const char *name;
#ifdef CONFIG_SERIAL_PMACZILOG_TTYS
    char *devname = "ttyS";
#else
    char *devname = "ttyPZ";
#endif

    pr_debug(" -> check_pmac_serial_console()\n");

    /* The user has requested a console so this is already set up. */
    if (strstr(boot_command_line, "console=")) {
        pr_debug(" console was specified !\n");
        return -EBUSY;
    }

    if (!of_chosen) {
        pr_debug(" of_chosen is NULL !\n");
        return -ENODEV;
    }

    /* We are getting a weird phandle from OF ... */
    /* ... So use the full path instead */
    name = of_get_property(of_chosen, "linux,stdout-path", NULL);
    if (name == NULL) {
        pr_debug(" no linux,stdout-path !\n");
        return -ENODEV;
    }
    prom_stdout = of_find_node_by_path(name);
    if (!prom_stdout) {
        pr_debug(" can't find stdout package %s !\n", name);
        return -ENODEV;
    }
    pr_debug("stdout is %s\n", prom_stdout->full_name);

    name = of_get_property(prom_stdout, "name", NULL);
    if (!name) {
        pr_debug(" stdout package has no name !\n");
        goto not_found;
    }

    if (strcmp(name, "ch-a") == 0)
        offset = 0;
    else if (strcmp(name, "ch-b") == 0)
        offset = 1;
    else
        goto not_found;
    of_node_put(prom_stdout);

    pr_debug("Found serial console at %s%d\n", devname, offset);

    return add_preferred_console(devname, offset, NULL);

 not_found:
    pr_debug("No preferred console found !\n");
    of_node_put(prom_stdout);
    return -ENODEV;
}
console_initcall(check_pmac_serial_console);

#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */

/*
 * Called very early, MMU is off, device-tree isn't unflattened
 */
static int __init pmac_probe(void)
{
    unsigned long root = of_get_flat_dt_root();

    if (!of_flat_dt_is_compatible(root, "Power Macintosh") &&
        !of_flat_dt_is_compatible(root, "MacRISC"))
        return 0;

#ifdef CONFIG_PPC64
    /*
     * On U3, the DART (iommu) must be allocated now since it
     * has an impact on htab_initialize (due to the large page it
     * occupies having to be broken up so the DART itself is not
     * part of the cacheable linar mapping
     */
    alloc_dart_table();

    hpte_init_native();
#endif

#ifdef CONFIG_PPC32
    /* isa_io_base gets set in pmac_pci_init */
    ISA_DMA_THRESHOLD = ~0L;
    DMA_MODE_READ = 1;
    DMA_MODE_WRITE = 2;
#endif /* CONFIG_PPC32 */

#ifdef CONFIG_PMAC_SMU
    /*
     * SMU based G5s need some memory below 2Gb, at least the current
     * driver needs that. We have to allocate it now. We allocate 4k
     * (1 small page) for now.
     */
    smu_cmdbuf_abs = memblock_alloc_base(4096, 4096, 0x80000000UL);
#endif /* CONFIG_PMAC_SMU */

    return 1;
}

#ifdef CONFIG_PPC64
/* Move that to pci.c */
static int pmac_pci_probe_mode(struct pci_bus *bus)
{
    struct device_node *node = pci_bus_to_OF_node(bus);

    /* We need to use normal PCI probing for the AGP bus,
     * since the device for the AGP bridge isn't in the tree.
     * Same for the PCIe host on U4 and the HT host bridge.
     */
    if (bus->self == NULL && (of_device_is_compatible(node, "u3-agp") ||
                  of_device_is_compatible(node, "u4-pcie") ||
                  of_device_is_compatible(node, "u3-ht")))
        return PCI_PROBE_NORMAL;
    return PCI_PROBE_DEVTREE;
}
#endif /* CONFIG_PPC64 */

define_machine(powermac) {
    .name           = "PowerMac",
    .probe          = pmac_probe,
    .setup_arch     = pmac_setup_arch,
    .init_early     = pmac_init_early,
    .show_cpuinfo       = pmac_show_cpuinfo,
    .init_IRQ       = pmac_pic_init,
    .get_irq        = NULL, /* changed later */
    .pci_irq_fixup      = pmac_pci_irq_fixup,
    .restart        = pmac_restart,
    .power_off      = pmac_power_off,
    .halt           = pmac_halt,
    .time_init      = pmac_time_init,
    .get_boot_time      = pmac_get_boot_time,
    .set_rtc_time       = pmac_set_rtc_time,
    .get_rtc_time       = pmac_get_rtc_time,
    .calibrate_decr     = pmac_calibrate_decr,
    .feature_call       = pmac_do_feature_call,
    .progress       = udbg_progress,
#ifdef CONFIG_PPC64
    .pci_probe_mode     = pmac_pci_probe_mode,
    .power_save     = power4_idle,
    .enable_pmcs        = power4_enable_pmcs,
#endif /* CONFIG_PPC64 */
#ifdef CONFIG_PPC32
    .pcibios_enable_device_hook = pmac_pci_enable_device_hook,
    .pcibios_after_init = pmac_pcibios_after_init,
    .phys_mem_access_prot   = pci_phys_mem_access_prot,
#endif
};