sead3-init.c

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/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2012 MIPS Technologies, Inc.  All rights reserved.
 */
#include <linux/init.h>
#include <linux/io.h>

#include <asm/bootinfo.h>
#include <asm/cacheflush.h>
#include <asm/traps.h>
#include <asm/mips-boards/generic.h>
#include <asm/mips-boards/prom.h>

extern void prom_init_early_console(char port);

extern char except_vec_nmi;
extern char except_vec_ejtag_debug;

int prom_argc;
int *_prom_argv, *_prom_envp;

#define prom_envp(index) ((char *)(long)_prom_envp[(index)])

char *prom_getenv(char *envname)
{
    /*
     * Return a pointer to the given environment variable.
     * In 64-bit mode: we're using 64-bit pointers, but all pointers
     * in the PROM structures are only 32-bit, so we need some
     * workarounds, if we are running in 64-bit mode.
     */
    int i, index = 0;

    i = strlen(envname);

    while (prom_envp(index)) {
        if (strncmp(envname, prom_envp(index), i) == 0)
            return prom_envp(index+1);
        index += 2;
    }

    return NULL;
}

static void __init mips_nmi_setup(void)
{
    void *base;

    base = cpu_has_veic ?
        (void *)(CAC_BASE + 0xa80) :
        (void *)(CAC_BASE + 0x380);
    memcpy(base, &except_vec_nmi, 0x80);
    flush_icache_range((unsigned long)base, (unsigned long)base + 0x80);
}

static void __init mips_ejtag_setup(void)
{
    void *base;

    base = cpu_has_veic ?
        (void *)(CAC_BASE + 0xa00) :
        (void *)(CAC_BASE + 0x300);
    memcpy(base, &except_vec_ejtag_debug, 0x80);
    flush_icache_range((unsigned long)base, (unsigned long)base + 0x80);
}

void __init prom_init(void)
{
    prom_argc = fw_arg0;
    _prom_argv = (int *) fw_arg1;
    _prom_envp = (int *) fw_arg2;

    board_nmi_handler_setup = mips_nmi_setup;
    board_ejtag_handler_setup = mips_ejtag_setup;

    prom_init_cmdline();
    prom_meminit();
#ifdef CONFIG_EARLY_PRINTK
    if ((strstr(prom_getcmdline(), "console=ttyS0")) != NULL)
        prom_init_early_console(0);
    else if ((strstr(prom_getcmdline(), "console=ttyS1")) != NULL)
        prom_init_early_console(1);
#endif
#ifdef CONFIG_SERIAL_8250_CONSOLE
    if ((strstr(prom_getcmdline(), "console=")) == NULL)
        strcat(prom_getcmdline(), " console=ttyS0,38400n8r");
#endif
}