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 extern void ip32_be_init(void);
  30 extern 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  */
  37 extern char o2meth_eaddr[8];
  38 static 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
  47 static 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
  66 void __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
  76 void __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 }