LXR linux/arch/mips/sgi-ip32/ip32-setup.c

   1/*
   2 * IP32 basic setup
   3 *
   4 * This file is subject to the terms and conditions of the GNU General Public
   5 * License.  See the file "COPYING" in the main directory of this archive
   6 * for more details.
   7 *
   8 * Copyright (C) 2000 Harald Koerfgen
   9 * Copyright (C) 2002, 2003, 2005 Ilya A. Volynets
  10 * Copyright (C) 2006 Ralf Baechle <ralf@linux-mips.org>
  11 */
  12#include <linux/console.h>
  13#include <linux/init.h>
  14#include <linux/interrupt.h>
  15#include <linux/mc146818rtc.h>
  16#include <linux/param.h>
  17#include <linux/sched.h>
  18
  19#include <asm/bootinfo.h>
  20#include <asm/mc146818-time.h>
  21#include <asm/mipsregs.h>
  22#include <asm/mmu_context.h>
  23#include <asm/sgialib.h>
  24#include <asm/time.h>
  25#include <asm/traps.h>
  26#include <asm/io.h>
  27#include <asm/ip32/crime.h>
  28#include <asm/ip32/mace.h>
  29#include <asm/ip32/ip32_ints.h>
  30
  31extern void ip32_be_init(void);
  32extern void crime_init(void);
  33
  34#ifdef CONFIG_SGI_O2MACE_ETH
  35/*
  36 * This is taken care of in here 'cause they say using Arc later on is
  37 * problematic
  38 */
  39extern char o2meth_eaddr[8];
  40static inline unsigned char str2hexnum(unsigned char c)
  41{
  42        if (c >= '0' && c <= '9')
  43                return c - '0';
  44        if (c >= 'a' && c <= 'f')
  45                return c - 'a' + 10;
  46        return 0; /* foo */
  47}
  48
  49static inline void str2eaddr(unsigned char *ea, unsigned char *str)
  50{
  51        int i;
  52
  53        for (i = 0; i < 6; i++) {
  54                unsigned char num;
  55
  56                if(*str == ':')
  57                        str++;
  58                num = str2hexnum(*str++) << 4;
  59                num |= (str2hexnum(*str++));
  60                ea[i] = num;
  61        }
  62}
  63#endif
  64
  65/* An arbitrary time; this can be decreased if reliability looks good */
  66#define WAIT_MS 10
  67
  68void __init plat_time_init(void)
  69{
  70        printk(KERN_INFO "Calibrating system timer... ");
  71        write_c0_count(0);
  72        crime->timer = 0;
  73        while (crime->timer < CRIME_MASTER_FREQ * WAIT_MS / 1000) ;
  74        mips_hpt_frequency = read_c0_count() * 1000 / WAIT_MS;
  75        printk("%d MHz CPU detected\n", mips_hpt_frequency * 2 / 1000000);
  76}
  77
  78void __init plat_mem_setup(void)
  79{
  80        board_be_init = ip32_be_init;
  81
  82#ifdef CONFIG_SGI_O2MACE_ETH
  83        {
  84                char *mac = ArcGetEnvironmentVariable("eaddr");
  85                str2eaddr(o2meth_eaddr, mac);
  86        }
  87#endif
  88
  89#if defined(CONFIG_SERIAL_CORE_CONSOLE)
  90        {
  91                char* con = ArcGetEnvironmentVariable("console");
  92                if (con && *con == 'd') {
  93                        static char options[8] __initdata;
  94                        char *baud = ArcGetEnvironmentVariable("dbaud");
  95                        if (baud)
  96                                strcpy(options, baud);
  97                        add_preferred_console("ttyS", *(con + 1) == '2' ? 1 : 0,
  98                                              baud ? options : NULL);
  99                }
 100        }
 101#endif
 102}
 103