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