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