setup-common.c

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/*
 * Common boot and setup code for both 32-bit and 64-bit.
 * Extracted from arch/powerpc/kernel/setup_64.c.
 *
 * Copyright (C) 2001 PPC64 Team, IBM Corp
 *
 *      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/export.h>
#include <linux/string.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#include <linux/initrd.h>
#include <linux/platform_device.h>
#include <linux/seq_file.h>
#include <linux/ioport.h>
#include <linux/console.h>
#include <linux/screen_info.h>
#include <linux/root_dev.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <linux/unistd.h>
#include <linux/serial.h>
#include <linux/serial_8250.h>
#include <linux/debugfs.h>
#include <linux/percpu.h>
#include <linux/memblock.h>
#include <linux/of_platform.h>
#include <asm/io.h>
#include <asm/paca.h>
#include <asm/prom.h>
#include <asm/processor.h>
#include <asm/vdso_datapage.h>
#include <asm/pgtable.h>
#include <asm/smp.h>
#include <asm/elf.h>
#include <asm/machdep.h>
#include <asm/time.h>
#include <asm/cputable.h>
#include <asm/sections.h>
#include <asm/firmware.h>
#include <asm/btext.h>
#include <asm/nvram.h>
#include <asm/setup.h>
#include <asm/rtas.h>
#include <asm/iommu.h>
#include <asm/serial.h>
#include <asm/cache.h>
#include <asm/page.h>
#include <asm/mmu.h>
#include <asm/xmon.h>
#include <asm/cputhreads.h>
#include <mm/mmu_decl.h>
#include <asm/fadump.h>

#include "setup.h"

#ifdef DEBUG
#include <asm/udbg.h>
#define DBG(fmt...) udbg_printf(fmt)
#else
#define DBG(fmt...)
#endif

/* The main machine-dep calls structure
 */
struct machdep_calls ppc_md;
EXPORT_SYMBOL(ppc_md);
struct machdep_calls *machine_id;
EXPORT_SYMBOL(machine_id);

unsigned long klimit = (unsigned long) _end;

char cmd_line[COMMAND_LINE_SIZE];

/*
 * This still seems to be needed... -- paulus
 */ 
struct screen_info screen_info = {
    .orig_x = 0,
    .orig_y = 25,
    .orig_video_cols = 80,
    .orig_video_lines = 25,
    .orig_video_isVGA = 1,
    .orig_video_points = 16
};

/* Variables required to store legacy IO irq routing */
int of_i8042_kbd_irq;
EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
int of_i8042_aux_irq;
EXPORT_SYMBOL_GPL(of_i8042_aux_irq);

#ifdef __DO_IRQ_CANON
/* XXX should go elsewhere eventually */
int ppc_do_canonicalize_irqs;
EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
#endif

/* also used by kexec */
void machine_shutdown(void)
{
#ifdef CONFIG_FA_DUMP
    /*
     * if fadump is active, cleanup the fadump registration before we
     * shutdown.
     */
    fadump_cleanup();
#endif

    if (ppc_md.machine_shutdown)
        ppc_md.machine_shutdown();
}

void machine_restart(char *cmd)
{
    machine_shutdown();
    if (ppc_md.restart)
        ppc_md.restart(cmd);
#ifdef CONFIG_SMP
    smp_send_stop();
#endif
    printk(KERN_EMERG "System Halted, OK to turn off power\n");
    local_irq_disable();
    while (1) ;
}

void machine_power_off(void)
{
    machine_shutdown();
    if (ppc_md.power_off)
        ppc_md.power_off();
#ifdef CONFIG_SMP
    smp_send_stop();
#endif
    printk(KERN_EMERG "System Halted, OK to turn off power\n");
    local_irq_disable();
    while (1) ;
}
/* Used by the G5 thermal driver */
EXPORT_SYMBOL_GPL(machine_power_off);

void (*pm_power_off)(void) = machine_power_off;
EXPORT_SYMBOL_GPL(pm_power_off);

void machine_halt(void)
{
    machine_shutdown();
    if (ppc_md.halt)
        ppc_md.halt();
#ifdef CONFIG_SMP
    smp_send_stop();
#endif
    printk(KERN_EMERG "System Halted, OK to turn off power\n");
    local_irq_disable();
    while (1) ;
}


#ifdef CONFIG_TAU
extern u32 cpu_temp(unsigned long cpu);
extern u32 cpu_temp_both(unsigned long cpu);
#endif /* CONFIG_TAU */

#ifdef CONFIG_SMP
DEFINE_PER_CPU(unsigned int, cpu_pvr);
#endif

static void show_cpuinfo_summary(struct seq_file *m)
{
    struct device_node *root;
    const char *model = NULL;
#if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
    unsigned long bogosum = 0;
    int i;
    for_each_online_cpu(i)
        bogosum += loops_per_jiffy;
    seq_printf(m, "total bogomips\t: %lu.%02lu\n",
           bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
#endif /* CONFIG_SMP && CONFIG_PPC32 */
    seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
    if (ppc_md.name)
        seq_printf(m, "platform\t: %s\n", ppc_md.name);
    root = of_find_node_by_path("/");
    if (root)
        model = of_get_property(root, "model", NULL);
    if (model)
        seq_printf(m, "model\t\t: %s\n", model);
    of_node_put(root);

    if (ppc_md.show_cpuinfo != NULL)
        ppc_md.show_cpuinfo(m);

#ifdef CONFIG_PPC32
    /* Display the amount of memory */
    seq_printf(m, "Memory\t\t: %d MB\n",
           (unsigned int)(total_memory / (1024 * 1024)));
#endif
}

static int show_cpuinfo(struct seq_file *m, void *v)
{
    unsigned long cpu_id = (unsigned long)v - 1;
    unsigned int pvr;
    unsigned short maj;
    unsigned short min;

    /* We only show online cpus: disable preempt (overzealous, I
     * knew) to prevent cpu going down. */
    preempt_disable();
    if (!cpu_online(cpu_id)) {
        preempt_enable();
        return 0;
    }

#ifdef CONFIG_SMP
    pvr = per_cpu(cpu_pvr, cpu_id);
#else
    pvr = mfspr(SPRN_PVR);
#endif
    maj = (pvr >> 8) & 0xFF;
    min = pvr & 0xFF;

    seq_printf(m, "processor\t: %lu\n", cpu_id);
    seq_printf(m, "cpu\t\t: ");

    if (cur_cpu_spec->pvr_mask)
        seq_printf(m, "%s", cur_cpu_spec->cpu_name);
    else
        seq_printf(m, "unknown (%08x)", pvr);

#ifdef CONFIG_ALTIVEC
    if (cpu_has_feature(CPU_FTR_ALTIVEC))
        seq_printf(m, ", altivec supported");
#endif /* CONFIG_ALTIVEC */

    seq_printf(m, "\n");

#ifdef CONFIG_TAU
    if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
#ifdef CONFIG_TAU_AVERAGE
        /* more straightforward, but potentially misleading */
        seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
               cpu_temp(cpu_id));
#else
        /* show the actual temp sensor range */
        u32 temp;
        temp = cpu_temp_both(cpu_id);
        seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
               temp & 0xff, temp >> 16);
#endif
    }
#endif /* CONFIG_TAU */

    /*
     * Assume here that all clock rates are the same in a
     * smp system.  -- Cort
     */
    if (ppc_proc_freq)
        seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
               ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);

    if (ppc_md.show_percpuinfo != NULL)
        ppc_md.show_percpuinfo(m, cpu_id);

    /* If we are a Freescale core do a simple check so
     * we dont have to keep adding cases in the future */
    if (PVR_VER(pvr) & 0x8000) {
        switch (PVR_VER(pvr)) {
        case 0x8000:    /* 7441/7450/7451, Voyager */
        case 0x8001:    /* 7445/7455, Apollo 6 */
        case 0x8002:    /* 7447/7457, Apollo 7 */
        case 0x8003:    /* 7447A, Apollo 7 PM */
        case 0x8004:    /* 7448, Apollo 8 */
        case 0x800c:    /* 7410, Nitro */
            maj = ((pvr >> 8) & 0xF);
            min = PVR_MIN(pvr);
            break;
        default:    /* e500/book-e */
            maj = PVR_MAJ(pvr);
            min = PVR_MIN(pvr);
            break;
        }
    } else {
        switch (PVR_VER(pvr)) {
            case 0x0020:    /* 403 family */
                maj = PVR_MAJ(pvr) + 1;
                min = PVR_MIN(pvr);
                break;
            case 0x1008:    /* 740P/750P ?? */
                maj = ((pvr >> 8) & 0xFF) - 1;
                min = pvr & 0xFF;
                break;
            default:
                maj = (pvr >> 8) & 0xFF;
                min = pvr & 0xFF;
                break;
        }
    }

    seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
           maj, min, PVR_VER(pvr), PVR_REV(pvr));

#ifdef CONFIG_PPC32
    seq_printf(m, "bogomips\t: %lu.%02lu\n",
           loops_per_jiffy / (500000/HZ),
           (loops_per_jiffy / (5000/HZ)) % 100);
#endif

#ifdef CONFIG_SMP
    seq_printf(m, "\n");
#endif

    preempt_enable();

    /* If this is the last cpu, print the summary */
    if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
        show_cpuinfo_summary(m);

    return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
    if (*pos == 0)  /* just in case, cpu 0 is not the first */
        *pos = cpumask_first(cpu_online_mask);
    else
        *pos = cpumask_next(*pos - 1, cpu_online_mask);
    if ((*pos) < nr_cpu_ids)
        return (void *)(unsigned long)(*pos + 1);
    return NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
    (*pos)++;
    return c_start(m, pos);
}

static void c_stop(struct seq_file *m, void *v)
{
}

const struct seq_operations cpuinfo_op = {
    .start =c_start,
    .next = c_next,
    .stop = c_stop,
    .show = show_cpuinfo,
};

void __init check_for_initrd(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
    DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
        initrd_start, initrd_end);

    /* If we were passed an initrd, set the ROOT_DEV properly if the values
     * look sensible. If not, clear initrd reference.
     */
    if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
        initrd_end > initrd_start)
        ROOT_DEV = Root_RAM0;
    else
        initrd_start = initrd_end = 0;

    if (initrd_start)
        printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);

    DBG(" <- check_for_initrd()\n");
#endif /* CONFIG_BLK_DEV_INITRD */
}

#ifdef CONFIG_SMP

int threads_per_core, threads_shift;
cpumask_t threads_core_mask;
EXPORT_SYMBOL_GPL(threads_per_core);
EXPORT_SYMBOL_GPL(threads_shift);
EXPORT_SYMBOL_GPL(threads_core_mask);

static void __init cpu_init_thread_core_maps(int tpc)
{
    int i;

    threads_per_core = tpc;
    cpumask_clear(&threads_core_mask);

    /* This implementation only supports power of 2 number of threads
     * for simplicity and performance
     */
    threads_shift = ilog2(tpc);
    BUG_ON(tpc != (1 << threads_shift));

    for (i = 0; i < tpc; i++)
        cpumask_set_cpu(i, &threads_core_mask);

    printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
           tpc, tpc > 1 ? "s" : "");
    printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
}


void __init smp_setup_cpu_maps(void)
{
    struct device_node *dn = NULL;
    int cpu = 0;
    int nthreads = 1;

    DBG("smp_setup_cpu_maps()\n");

    while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < nr_cpu_ids) {
        const int *intserv;
        int j, len;

        DBG("  * %s...\n", dn->full_name);

        intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
                &len);
        if (intserv) {
            nthreads = len / sizeof(int);
            DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
                nthreads);
        } else {
            DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
            intserv = of_get_property(dn, "reg", NULL);
            if (!intserv)
                intserv = &cpu; /* assume logical == phys */
        }

        for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
            DBG("    thread %d -> cpu %d (hard id %d)\n",
                j, cpu, intserv[j]);
            set_cpu_present(cpu, true);
            set_hard_smp_processor_id(cpu, intserv[j]);
            set_cpu_possible(cpu, true);
            cpu++;
        }
    }

    /* If no SMT supported, nthreads is forced to 1 */
    if (!cpu_has_feature(CPU_FTR_SMT)) {
        DBG("  SMT disabled ! nthreads forced to 1\n");
        nthreads = 1;
    }

#ifdef CONFIG_PPC64
    /*
     * On pSeries LPAR, we need to know how many cpus
     * could possibly be added to this partition.
     */
    if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
        (dn = of_find_node_by_path("/rtas"))) {
        int num_addr_cell, num_size_cell, maxcpus;
        const unsigned int *ireg;

        num_addr_cell = of_n_addr_cells(dn);
        num_size_cell = of_n_size_cells(dn);

        ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);

        if (!ireg)
            goto out;

        maxcpus = ireg[num_addr_cell + num_size_cell];

        /* Double maxcpus for processors which have SMT capability */
        if (cpu_has_feature(CPU_FTR_SMT))
            maxcpus *= nthreads;

        if (maxcpus > nr_cpu_ids) {
            printk(KERN_WARNING
                   "Partition configured for %d cpus, "
                   "operating system maximum is %d.\n",
                   maxcpus, nr_cpu_ids);
            maxcpus = nr_cpu_ids;
        } else
            printk(KERN_INFO "Partition configured for %d cpus.\n",
                   maxcpus);

        for (cpu = 0; cpu < maxcpus; cpu++)
            set_cpu_possible(cpu, true);
    out:
        of_node_put(dn);
    }
    vdso_data->processorCount = num_present_cpus();
#endif /* CONFIG_PPC64 */

        /* Initialize CPU <=> thread mapping/
     *
     * WARNING: We assume that the number of threads is the same for
     * every CPU in the system. If that is not the case, then some code
     * here will have to be reworked
     */
    cpu_init_thread_core_maps(nthreads);

    /* Now that possible cpus are set, set nr_cpu_ids for later use */
    setup_nr_cpu_ids();

    free_unused_pacas();
}
#endif /* CONFIG_SMP */

#ifdef CONFIG_PCSPKR_PLATFORM
static __init int add_pcspkr(void)
{
    struct device_node *np;
    struct platform_device *pd;
    int ret;

    np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
    of_node_put(np);
    if (!np)
        return -ENODEV;

    pd = platform_device_alloc("pcspkr", -1);
    if (!pd)
        return -ENOMEM;

    ret = platform_device_add(pd);
    if (ret)
        platform_device_put(pd);

    return ret;
}
device_initcall(add_pcspkr);
#endif  /* CONFIG_PCSPKR_PLATFORM */

void probe_machine(void)
{
    extern struct machdep_calls __machine_desc_start;
    extern struct machdep_calls __machine_desc_end;

    /*
     * Iterate all ppc_md structures until we find the proper
     * one for the current machine type
     */
    DBG("Probing machine type ...\n");

    for (machine_id = &__machine_desc_start;
         machine_id < &__machine_desc_end;
         machine_id++) {
        DBG("  %s ...", machine_id->name);
        memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
        if (ppc_md.probe()) {
            DBG(" match !\n");
            break;
        }
        DBG("\n");
    }
    /* What can we do if we didn't find ? */
    if (machine_id >= &__machine_desc_end) {
        DBG("No suitable machine found !\n");
        for (;;);
    }

    printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
}

/* Match a class of boards, not a specific device configuration. */
int check_legacy_ioport(unsigned long base_port)
{
    struct device_node *parent, *np = NULL;
    int ret = -ENODEV;

    switch(base_port) {
    case I8042_DATA_REG:
        if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
            np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
        if (np) {
            parent = of_get_parent(np);

            of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
            if (!of_i8042_kbd_irq)
                of_i8042_kbd_irq = 1;

            of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
            if (!of_i8042_aux_irq)
                of_i8042_aux_irq = 12;

            of_node_put(np);
            np = parent;
            break;
        }
        np = of_find_node_by_type(NULL, "8042");
        /* Pegasos has no device_type on its 8042 node, look for the
         * name instead */
        if (!np)
            np = of_find_node_by_name(NULL, "8042");
        if (np) {
            of_i8042_kbd_irq = 1;
            of_i8042_aux_irq = 12;
        }
        break;
    case FDC_BASE: /* FDC1 */
        np = of_find_node_by_type(NULL, "fdc");
        break;
#ifdef CONFIG_PPC_PREP
    case _PIDXR:
    case _PNPWRP:
    case PNPBIOS_BASE:
        /* implement me */
#endif
    default:
        /* ipmi is supposed to fail here */
        break;
    }
    if (!np)
        return ret;
    parent = of_get_parent(np);
    if (parent) {
        if (strcmp(parent->type, "isa") == 0)
            ret = 0;
        of_node_put(parent);
    }
    of_node_put(np);
    return ret;
}
EXPORT_SYMBOL(check_legacy_ioport);

static int ppc_panic_event(struct notifier_block *this,
                             unsigned long event, void *ptr)
{
    /*
     * If firmware-assisted dump has been registered then trigger
     * firmware-assisted dump and let firmware handle everything else.
     */
    crash_fadump(NULL, ptr);
    ppc_md.panic(ptr);  /* May not return */
    return NOTIFY_DONE;
}

static struct notifier_block ppc_panic_block = {
    .notifier_call = ppc_panic_event,
    .priority = INT_MIN /* may not return; must be done last */
};

void __init setup_panic(void)
{
    atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
}

#ifdef CONFIG_CHECK_CACHE_COHERENCY
/*
 * For platforms that have configurable cache-coherency.  This function
 * checks that the cache coherency setting of the kernel matches the setting
 * left by the firmware, as indicated in the device tree.  Since a mismatch
 * will eventually result in DMA failures, we print * and error and call
 * BUG() in that case.
 */

#ifdef CONFIG_NOT_COHERENT_CACHE
#define KERNEL_COHERENCY    0
#else
#define KERNEL_COHERENCY    1
#endif

static int __init check_cache_coherency(void)
{
    struct device_node *np;
    const void *prop;
    int devtree_coherency;

    np = of_find_node_by_path("/");
    prop = of_get_property(np, "coherency-off", NULL);
    of_node_put(np);

    devtree_coherency = prop ? 0 : 1;

    if (devtree_coherency != KERNEL_COHERENCY) {
        printk(KERN_ERR
            "kernel coherency:%s != device tree_coherency:%s\n",
            KERNEL_COHERENCY ? "on" : "off",
            devtree_coherency ? "on" : "off");
        BUG();
    }

    return 0;
}

late_initcall(check_cache_coherency);
#endif /* CONFIG_CHECK_CACHE_COHERENCY */

#ifdef CONFIG_DEBUG_FS
struct dentry *powerpc_debugfs_root;
EXPORT_SYMBOL(powerpc_debugfs_root);

static int powerpc_debugfs_init(void)
{
    powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);

    return powerpc_debugfs_root == NULL;
}
arch_initcall(powerpc_debugfs_init);
#endif

#ifdef CONFIG_BOOKE_WDT
extern u32 booke_wdt_enabled;
extern u32 booke_wdt_period;

/* Checks wdt=x and wdt_period=xx command-line option */
notrace int __init early_parse_wdt(char *p)
{
    if (p && strncmp(p, "0", 1) != 0)
        booke_wdt_enabled = 1;

    return 0;
}
early_param("wdt", early_parse_wdt);

int __init early_parse_wdt_period(char *p)
{
    unsigned long ret;
    if (p) {
        if (!kstrtol(p, 0, &ret))
            booke_wdt_period = ret;
    }

    return 0;
}
early_param("wdt_period", early_parse_wdt_period);
#endif  /* CONFIG_BOOKE_WDT */

void ppc_printk_progress(char *s, unsigned short hex)
{
    pr_info("%s\n", s);
}

void arch_setup_pdev_archdata(struct platform_device *pdev)
{
    pdev->archdata.dma_mask = DMA_BIT_MASK(32);
    pdev->dev.dma_mask = &pdev->archdata.dma_mask;
    set_dma_ops(&pdev->dev, &dma_direct_ops);
}