ip32-setup.c

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/*
 * IP32 basic setup
 *
 * 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) 2000 Harald Koerfgen
 * Copyright (C) 2002, 2003, 2005 Ilya A. Volynets
 * Copyright (C) 2006 Ralf Baechle <[email protected]>
 */
#include <linux/console.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/mc146818rtc.h>
#include <linux/param.h>
#include <linux/sched.h>

#include <asm/bootinfo.h>
#include <asm/mc146818-time.h>
#include <asm/mipsregs.h>
#include <asm/mmu_context.h>
#include <asm/sgialib.h>
#include <asm/time.h>
#include <asm/traps.h>
#include <asm/io.h>
#include <asm/ip32/crime.h>
#include <asm/ip32/mace.h>
#include <asm/ip32/ip32_ints.h>

extern void ip32_be_init(void);
extern void crime_init(void);

#ifdef CONFIG_SGI_O2MACE_ETH
/*
 * This is taken care of in here 'cause they say using Arc later on is
 * problematic
 */
extern char o2meth_eaddr[8];
static inline unsigned char str2hexnum(unsigned char c)
{
    if (c >= '0' && c <= '9')
        return c - '0';
    if (c >= 'a' && c <= 'f')
        return c - 'a' + 10;
    return 0; /* foo */
}

static inline void str2eaddr(unsigned char *ea, unsigned char *str)
{
    int i;

    for (i = 0; i < 6; i++) {
        unsigned char num;

        if(*str == ':')
            str++;
        num = str2hexnum(*str++) << 4;
        num |= (str2hexnum(*str++));
        ea[i] = num;
    }
}
#endif

/* An arbitrary time; this can be decreased if reliability looks good */
#define WAIT_MS 10

void __init plat_time_init(void)
{
    printk(KERN_INFO "Calibrating system timer... ");
    write_c0_count(0);
    crime->timer = 0;
    while (crime->timer < CRIME_MASTER_FREQ * WAIT_MS / 1000) ;
    mips_hpt_frequency = read_c0_count() * 1000 / WAIT_MS;
    printk("%d MHz CPU detected\n", mips_hpt_frequency * 2 / 1000000);
}

void __init plat_mem_setup(void)
{
    board_be_init = ip32_be_init;

#ifdef CONFIG_SGI_O2MACE_ETH
    {
        char *mac = ArcGetEnvironmentVariable("eaddr");
        str2eaddr(o2meth_eaddr, mac);
    }
#endif

#if defined(CONFIG_SERIAL_CORE_CONSOLE)
    {
        char* con = ArcGetEnvironmentVariable("console");
        if (con && *con == 'd') {
            static char options[8] __initdata;
            char *baud = ArcGetEnvironmentVariable("dbaud");
            if (baud)
                strcpy(options, baud);
            add_preferred_console("ttyS", *(con + 1) == '2' ? 1 : 0,
                          baud ? options : NULL);
        }
    }
#endif
}