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/system.h>
  24 #include <asm/bootinfo.h>
  25 #include <asm/pmon.h>
  26
  27 #ifdef CONFIG_SMP
  28 extern void prom_grab_secondary(void);
  29 #else
  30 #define prom_grab_secondary() do { } while (0)
  31 #endif
  32
  33 #include "setup.h"
  34
  35 struct callvectors *debug_vectors;
  36
  37 extern unsigned long yosemite_base;
  38 extern unsigned long cpu_clock_freq;
  39
  40 const char *get_system_type(void)
  41 {
  42         return "PMC-Sierra Yosemite";
  43 }
  44
  45 static void prom_cpu0_exit(void *arg)
  46 {
  47         void *nvram = (void *) YOSEMITE_RTC_BASE;
  48
  49         /* Ask the NVRAM/RTC/watchdog chip to assert reset in 1/16 second */
  50         writeb(0x84, nvram + 0xff7);
  51
  52         /* wait for the watchdog to go off */
  53         mdelay(100 + (1000 / 16));
  54
  55         /* if the watchdog fails for some reason, let people know */
  56         printk(KERN_NOTICE "Watchdog reset failed\n");
  57 }
  58
  59 /*
  60  * Reset the NVRAM over the local bus
  61  */
  62 static void prom_exit(void)
  63 {
  64 #ifdef CONFIG_SMP
  65         if (smp_processor_id())
  66                 /* CPU 1 */
  67                 smp_call_function(prom_cpu0_exit, NULL, 1, 1);
  68 #endif
  69         prom_cpu0_exit(NULL);
  70 }
  71
  72 /*
  73  * Halt the system
  74  */
  75 static void prom_halt(void)
  76 {
  77         printk(KERN_NOTICE "\n** You can safely turn off the power\n");
  78         while (1)
  79                 __asm__(".set\tmips3\n\t" "wait\n\t" ".set\tmips0");
  80 }
  81
  82 extern struct plat_smp_ops yos_smp_ops;
  83
  84 /*
  85  * Init routine which accepts the variables from PMON
  86  */
  87 void __init prom_init(void)
  88 {
  89         int argc = fw_arg0;
  90         char **arg = (char **) fw_arg1;
  91         char **env = (char **) fw_arg2;
  92         struct callvectors *cv = (struct callvectors *) fw_arg3;
  93         int i = 0;
  94
  95         /* Callbacks for halt, restart */
  96         _machine_restart = (void (*)(char *)) prom_exit;
  97         _machine_halt = prom_halt;
  98         pm_power_off = prom_halt;
  99
 100         debug_vectors = cv;
 101         arcs_cmdline[0] = '\0';
 102
 103         /* Get the boot parameters */
 104         for (i = 1; i < argc; i++) {
 105                 if (strlen(arcs_cmdline) + strlen(arg[i] + 1) >=
 106                     sizeof(arcs_cmdline))
 107                         break;
 108
 109                 strcat(arcs_cmdline, arg[i]);
 110                 strcat(arcs_cmdline, " ");
 111         }
 112
 113 #ifdef CONFIG_SERIAL_8250_CONSOLE
 114         if ((strstr(arcs_cmdline, "console=ttyS")) == NULL)
 115                 strcat(arcs_cmdline, "console=ttyS0,115200");
 116 #endif
 117
 118         while (*env) {
 119                 if (strncmp("ocd_base", *env, strlen("ocd_base")) == 0)
 120                         yosemite_base =
 121                             simple_strtol(*env + strlen("ocd_base="), NULL,
 122                                           16);
 123
 124                 if (strncmp("cpuclock", *env, strlen("cpuclock")) == 0)
 125                         cpu_clock_freq =
 126                             simple_strtol(*env + strlen("cpuclock="), NULL,
 127                                           10);
 128
 129                 env++;
 130         }
 131
 132         prom_grab_secondary();
 133
 134         register_smp_ops(&yos_smp_ops);
 135 }
 136
 137 void __init prom_free_prom_memory(void)
 138 {
 139 }
 140
 141 void __init prom_fixup_mem_map(unsigned long start, unsigned long end)
 142 {
 143 }