release/src-rt-6.x.4708/linux/linux-2.6.36/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
  31 extern void ip32_be_init(void);
  32 extern 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  */
  39 extern char o2meth_eaddr[8];
  40 static 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
  49 static 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
  68 void __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
  78 void __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 }