arch/mips/pmc-sierra/yosemite/prom.c

   1 /*
   2  * This program is free software; you can redistribute  it and/or modify it
   3  * under  the terms of  the GNU General  Public License as published by the
   4  * Free Software Foundation;  either version 2 of the  License, or (at your
   5  * option) any later version.
   6  *
   7  * Copyright (C) 2003, 2004 PMC-Sierra Inc.
   8  * Author: Manish Lachwani (lachwani@pmc-sierra.com)
   9  * Copyright (C) 2004 Ralf Baechle
  10  */
  11 #include <linux/config.h>
  12 #include <linux/init.h>
  13 #include <linux/sched.h>
  14 #include <linux/mm.h>
  15 #include <linux/delay.h>
  16 #include <linux/smp.h>
  17
  18 #include <asm/io.h>
  19 #include <asm/pgtable.h>
  20 #include <asm/processor.h>
  21 #include <asm/reboot.h>
  22 #include <asm/system.h>
  23 #include <asm/bootinfo.h>
  24 #include <asm/pmon.h>
  25
  26 #ifdef CONFIG_SMP
  27 extern void prom_grab_secondary(void);
  28 #else
  29 #define prom_grab_secondary() do { } while (0)
  30 #endif
  31
  32 #include "setup.h"
  33
  34 struct callvectors *debug_vectors;
  35
  36 extern unsigned long yosemite_base;
  37 extern unsigned long cpu_clock;
  38
  39 const char *get_system_type(void)
  40 {
  41         return "PMC-Sierra Yosemite";
  42 }
  43
  44 static void prom_cpu0_exit(void *arg)
  45 {
  46         void *nvram = (void *) YOSEMITE_RTC_BASE;
  47
  48         /* Ask the NVRAM/RTC/watchdog chip to assert reset in 1/16 second */
  49         writeb(0x84, nvram + 0xff7);
  50
  51         /* wait for the watchdog to go off */
  52         mdelay(100 + (1000 / 16));
  53
  54         /* if the watchdog fails for some reason, let people know */
  55         printk(KERN_NOTICE "Watchdog reset failed\n");
  56 }
  57
  58 /*
  59  * Reset the NVRAM over the local bus
  60  */
  61 static void prom_exit(void)
  62 {
  63 #ifdef CONFIG_SMP
  64         if (smp_processor_id())
  65                 /* CPU 1 */
  66                 smp_call_function(prom_cpu0_exit, NULL, 1, 1);
  67 #endif
  68         prom_cpu0_exit(NULL);
  69 }
  70
  71 /*
  72  * Halt the system
  73  */
  74 static void prom_halt(void)
  75 {
  76         printk(KERN_NOTICE "\n** You can safely turn off the power\n");
  77         while (1)
  78                 __asm__(".set\tmips3\n\t" "wait\n\t" ".set\tmips0");
  79 }
  80
  81 /*
  82  * Init routine which accepts the variables from PMON
  83  */
  84 void __init prom_init(void)
  85 {
  86         int argc = fw_arg0;
  87         char **arg = (char **) fw_arg1;
  88         char **env = (char **) fw_arg2;
  89         struct callvectors *cv = (struct callvectors *) fw_arg3;
  90         int i = 0;
  91
  92         /* Callbacks for halt, restart */
  93         _machine_restart = (void (*)(char *)) prom_exit;
  94         _machine_halt = prom_halt;
  95         _machine_power_off = prom_halt;
  96
  97         debug_vectors = cv;
  98         arcs_cmdline[0] = '\0';
  99
 100         /* Get the boot parameters */
 101         for (i = 1; i < argc; i++) {
 102                 if (strlen(arcs_cmdline) + strlen(arg[i] + 1) >=
 103                     sizeof(arcs_cmdline))
 104                         break;
 105
 106                 strcat(arcs_cmdline, arg[i]);
 107                 strcat(arcs_cmdline, " ");
 108         }
 109
 110 #ifdef CONFIG_SERIAL_8250_CONSOLE
 111         if ((strstr(arcs_cmdline, "console=ttyS")) == NULL)
 112                 strcat(arcs_cmdline, "console=ttyS0,115200");
 113 #endif
 114
 115         while (*env) {
 116                 if (strncmp("ocd_base", *env, strlen("ocd_base")) == 0)
 117                         yosemite_base =
 118                             simple_strtol(*env + strlen("ocd_base="), NULL,
 119                                           16);
 120
 121                 if (strncmp("cpuclock", *env, strlen("cpuclock")) == 0)
 122                         cpu_clock =
 123                             simple_strtol(*env + strlen("cpuclock="), NULL,
 124                                           10);
 125
 126                 env++;
 127         }
 128
 129         mips_machgroup = MACH_GROUP_TITAN;
 130         mips_machtype = MACH_TITAN_YOSEMITE;
 131
 132         prom_grab_secondary();
 133 }
 134
 135 void __init prom_free_prom_memory(void)
 136 {
 137 }
 138
 139 void __init prom_fixup_mem_map(unsigned long start, unsigned long end)
 140 {
 141 }