arch/mips/gt64120/momenco_ocelot/prom.c

   1 /*
   2  * Copyright 2001 MontaVista Software Inc.
   3  * Author: jsun@mvista.com or jsun@junsun.net
   4  *
   5  * This program is free software; you can redistribute  it and/or modify it
   6  * under  the terms of  the GNU General  Public License as published by the
   7  * Free Software Foundation;  either version 2 of the  License, or (at your
   8  * option) any later version.
   9  */
  10 #include <linux/init.h>
  11 #include <linux/mm.h>
  12 #include <linux/sched.h>
  13 #include <linux/bootmem.h>
  14
  15 #include <asm/addrspace.h>
  16 #include <asm/bootinfo.h>
  17 #include <asm/pmon.h>
  18
  19 struct callvectors* debug_vectors;
  20
  21 extern unsigned long gt64120_base;
  22
  23 const char *get_system_type(void)
  24 {
  25         return "Momentum Ocelot";
  26 }
  27
  28 /* [jsun@junsun.net] PMON passes arguments in C main() style */
  29 void __init prom_init(void)
  30 {
  31         int argc = fw_arg0;
  32         char **arg = (char **) fw_arg1;
  33         char **env = (char **) fw_arg2;
  34         struct callvectors *cv = (struct callvectors *) fw_arg3;
  35         uint32_t tmp;
  36         int i;
  37
  38         /* save the PROM vectors for debugging use */
  39         debug_vectors = cv;
  40
  41         /* arg[0] is "g", the rest is boot parameters */
  42         arcs_cmdline[0] = '\0';
  43         for (i = 1; i < argc; i++) {
  44                 if (strlen(arcs_cmdline) + strlen(arg[i] + 1)
  45                     >= sizeof(arcs_cmdline))
  46                         break;
  47                 strcat(arcs_cmdline, arg[i]);
  48                 strcat(arcs_cmdline, " ");
  49         }
  50
  51         mips_machgroup = MACH_GROUP_MOMENCO;
  52         mips_machtype = MACH_MOMENCO_OCELOT;
  53
  54         while (*env) {
  55                 if (strncmp("gtbase", *env, 6) == 0) {
  56                         gt64120_base = simple_strtol(*env + strlen("gtbase="),
  57                                                         NULL, 16);
  58                         break;
  59                 }
  60                 *env++;
  61         }
  62
  63         debug_vectors->printf("Booting Linux kernel...\n");
  64
  65         /* All the boards have at least 64MiB. If there's more, we
  66            detect and register it later */
  67         add_memory_region(0, 64 << 20, BOOT_MEM_RAM);
  68 }
  69
  70 unsigned long __init prom_free_prom_memory(void)
  71 {
  72         return 0;
  73 }