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/init.h>
  12 #include <linux/sched.h>
  13 #include <linux/mm.h>
  14 #include <linux/delay.h>
  15 #include <linux/pm.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/smp-ops.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_freq;
  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);
  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 extern struct plat_smp_ops yos_smp_ops;
  82
  83 /*
  84  * Init routine which accepts the variables from PMON
  85  */
  86 void __init prom_init(void)
  87 {
  88         int argc = fw_arg0;
  89         char **arg = (char **) fw_arg1;
  90         char **env = (char **) fw_arg2;
  91         struct callvectors *cv = (struct callvectors *) fw_arg3;
  92         int i = 0;
  93
  94         /* Callbacks for halt, restart */
  95         _machine_restart = (void (*)(char *)) prom_exit;
  96         _machine_halt = prom_halt;
  97         pm_power_off = prom_halt;
  98
  99         debug_vectors = cv;
 100         arcs_cmdline[0] = '\0';
 101
 102         /* Get the boot parameters */
 103         for (i = 1; i < argc; i++) {
 104                 if (strlen(arcs_cmdline) + strlen(arg[i]) + 1 >=
 105                     sizeof(arcs_cmdline))
 106                         break;
 107
 108                 strcat(arcs_cmdline, arg[i]);
 109                 strcat(arcs_cmdline, " ");
 110         }
 111
 112 #ifdef CONFIG_SERIAL_8250_CONSOLE
 113         if ((strstr(arcs_cmdline, "console=ttyS")) == NULL)
 114                 strcat(arcs_cmdline, "console=ttyS0,115200");
 115 #endif
 116
 117         while (*env) {
 118                 if (strncmp("ocd_base", *env, strlen("ocd_base")) == 0)
 119                         yosemite_base =
 120                             simple_strtol(*env + strlen("ocd_base="), NULL,
 121                                           16);
 122
 123                 if (strncmp("cpuclock", *env, strlen("cpuclock")) == 0)
 124                         cpu_clock_freq =
 125                             simple_strtol(*env + strlen("cpuclock="), NULL,
 126                                           10);
 127
 128                 env++;
 129         }
 130
 131         prom_grab_secondary();
 132
 133         register_smp_ops(&yos_smp_ops);
 134 }
 135
 136 void __init prom_free_prom_memory(void)
 137 {
 138 }
 139
 140 void __init prom_fixup_mem_map(unsigned long start, unsigned long end)
 141 {
 142 }