arch/mips/lemote/lm2e/prom.c

   1 /*
   2  * Based on Ocelot Linux port, which is
   3  * Copyright 2001 MontaVista Software Inc.
   4  * Author: jsun@mvista.com or jsun@junsun.net
   5  *
   6  * Copyright 2003 ICT CAS
   7  * Author: Michael Guo <guoyi@ict.ac.cn>
   8  *
   9  * Copyright (C) 2007 Lemote Inc. & Insititute of Computing Technology
  10  * Author: Fuxin Zhang, zhangfx@lemote.com
  11  *
  12  * This program is free software; you can redistribute  it and/or modify it
  13  * under  the terms of  the GNU General  Public License as published by the
  14  * Free Software Foundation;  either version 2 of the  License, or (at your
  15  * option) any later version.
  16  */
  17 #include <linux/init.h>
  18 #include <linux/bootmem.h>
  19 #include <asm/bootinfo.h>
  20
  21 extern unsigned long bus_clock;
  22 extern unsigned long cpu_clock_freq;
  23 extern unsigned int memsize, highmemsize;
  24 extern int putDebugChar(unsigned char byte);
  25
  26 static int argc;
  27 /* pmon passes arguments in 32bit pointers */
  28 static int *arg;
  29 static int *env;
  30
  31 const char *get_system_type(void)
  32 {
  33         return "lemote-fulong";
  34 }
  35
  36 void __init prom_init_cmdline(void)
  37 {
  38         int i;
  39         long l;
  40
  41         /* arg[0] is "g", the rest is boot parameters */
  42         arcs_cmdline[0] = '\0';
  43         for (i = 1; i < argc; i++) {
  44                 l = (long)arg[i];
  45                 if (strlen(arcs_cmdline) + strlen(((char *)l) + 1)
  46                     >= sizeof(arcs_cmdline))
  47                         break;
  48                 strcat(arcs_cmdline, ((char *)l));
  49                 strcat(arcs_cmdline, " ");
  50         }
  51 }
  52
  53 void __init prom_init(void)
  54 {
  55         long l;
  56         argc = fw_arg0;
  57         arg = (int *)fw_arg1;
  58         env = (int *)fw_arg2;
  59
  60         prom_init_cmdline();
  61
  62         if ((strstr(arcs_cmdline, "console=")) == NULL)
  63                 strcat(arcs_cmdline, " console=ttyS0,115200");
  64         if ((strstr(arcs_cmdline, "root=")) == NULL)
  65                 strcat(arcs_cmdline, " root=/dev/hda1");
  66
  67 #define parse_even_earlier(res, option, p)                              \
  68 do {                                                                    \
  69         if (strncmp(option, (char *)p, strlen(option)) == 0)            \
  70                 res = simple_strtol((char *)p + strlen(option"="),      \
  71                                     NULL, 10);                          \
  72 } while (0)
  73
  74         l = (long)*env;
  75         while (l != 0) {
  76                 parse_even_earlier(bus_clock, "busclock", l);
  77                 parse_even_earlier(cpu_clock_freq, "cpuclock", l);
  78                 parse_even_earlier(memsize, "memsize", l);
  79                 parse_even_earlier(highmemsize, "highmemsize", l);
  80                 env++;
  81                 l = (long)*env;
  82         }
  83         if (memsize == 0)
  84                 memsize = 256;
  85
  86         pr_info("busclock=%ld, cpuclock=%ld,memsize=%d,highmemsize=%d\n",
  87                bus_clock, cpu_clock_freq, memsize, highmemsize);
  88 }
  89
  90 void __init prom_free_prom_memory(void)
  91 {
  92 }
  93
  94 void prom_putchar(char c)
  95 {
  96         putDebugChar(c);
  97 }