prom.c

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/*
 * 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.
 *
 * Copyright (C) 2003, 2004 PMC-Sierra Inc.
 * Author: Manish Lachwani ([email protected])
 * Copyright (C) 2004 Ralf Baechle
 */
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/smp.h>

#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/reboot.h>
#include <asm/smp-ops.h>
#include <asm/bootinfo.h>
#include <asm/pmon.h>

#ifdef CONFIG_SMP
extern void prom_grab_secondary(void);
#else
#define prom_grab_secondary() do { } while (0)
#endif

#include "setup.h"

struct callvectors *debug_vectors;

extern unsigned long yosemite_base;
extern unsigned long cpu_clock_freq;

const char *get_system_type(void)
{
    return "PMC-Sierra Yosemite";
}

static void prom_cpu0_exit(void *arg)
{
    void *nvram = (void *) YOSEMITE_RTC_BASE;

    /* Ask the NVRAM/RTC/watchdog chip to assert reset in 1/16 second */
    writeb(0x84, nvram + 0xff7);

    /* wait for the watchdog to go off */
    mdelay(100 + (1000 / 16));

    /* if the watchdog fails for some reason, let people know */
    printk(KERN_NOTICE "Watchdog reset failed\n");
}

/*
 * Reset the NVRAM over the local bus
 */
static void prom_exit(void)
{
#ifdef CONFIG_SMP
    if (smp_processor_id())
        /* CPU 1 */
        smp_call_function(prom_cpu0_exit, NULL, 1);
#endif
    prom_cpu0_exit(NULL);
}

/*
 * Halt the system
 */
static void prom_halt(void)
{
    printk(KERN_NOTICE "\n** You can safely turn off the power\n");
    while (1)
        __asm__(".set\tmips3\n\t" "wait\n\t" ".set\tmips0");
}

extern struct plat_smp_ops yos_smp_ops;

/*
 * Init routine which accepts the variables from PMON
 */
void __init prom_init(void)
{
    int argc = fw_arg0;
    char **arg = (char **) fw_arg1;
    char **env = (char **) fw_arg2;
    struct callvectors *cv = (struct callvectors *) fw_arg3;
    int i = 0;

    /* Callbacks for halt, restart */
    _machine_restart = (void (*)(char *)) prom_exit;
    _machine_halt = prom_halt;
    pm_power_off = prom_halt;

    debug_vectors = cv;
    arcs_cmdline[0] = '\0';

    /* Get the boot parameters */
    for (i = 1; i < argc; i++) {
        if (strlen(arcs_cmdline) + strlen(arg[i]) + 1 >=
            sizeof(arcs_cmdline))
            break;

        strcat(arcs_cmdline, arg[i]);
        strcat(arcs_cmdline, " ");
    }

#ifdef CONFIG_SERIAL_8250_CONSOLE
    if ((strstr(arcs_cmdline, "console=ttyS")) == NULL)
        strcat(arcs_cmdline, "console=ttyS0,115200");
#endif

    while (*env) {
        if (strncmp("ocd_base", *env, strlen("ocd_base")) == 0)
            yosemite_base =
                simple_strtol(*env + strlen("ocd_base="), NULL,
                      16);

        if (strncmp("cpuclock", *env, strlen("cpuclock")) == 0)
            cpu_clock_freq =
                simple_strtol(*env + strlen("cpuclock="), NULL,
                      10);

        env++;
    }

    prom_grab_secondary();

    register_smp_ops(&yos_smp_ops);
}

void __init prom_free_prom_memory(void)
{
}

void __init prom_fixup_mem_map(unsigned long start, unsigned long end)
{
}