arch/mips/ite-boards/generic/pmon_prom.c

   1 /*
   2  *
   3  * BRIEF MODULE DESCRIPTION
   4  *    PROM library initialisation code, assuming a version of
   5  *    pmon is the boot code.
   6  *
   7  * Copyright 2000 MontaVista Software Inc.
   8  * Author: MontaVista Software, Inc.
   9  *              ppopov@mvista.com or source@mvista.com
  10  *
  11  * This file was derived from Carsten Langgaard's
  12  * arch/mips/mips-boards/xx files.
  13  *
  14  * Carsten Langgaard, carstenl@mips.com
  15  * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
  16  *
  17  *  This program is free software; you can redistribute  it and/or modify it
  18  *  under  the terms of  the GNU General  Public License as published by the
  19  *  Free Software Foundation;  either version 2 of the  License, or (at your
  20  *  option) any later version.
  21  *
  22  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  23  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  24  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  25  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  26  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  28  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  29  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  30  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  *  You should have received a copy of the  GNU General Public License along
  34  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  35  *  675 Mass Ave, Cambridge, MA 02139, USA.
  36  */
  37
  38 #include <linux/config.h>
  39 #include <linux/kernel.h>
  40 #include <linux/init.h>
  41 #include <linux/string.h>
  42
  43 #include <asm/bootinfo.h>
  44
  45 extern int prom_argc;
  46 extern char **prom_argv, **prom_envp;
  47
  48 typedef struct
  49 {
  50     char *name;
  51 /*    char *val; */
  52 }t_env_var;
  53
  54
  55 char * __init prom_getcmdline(void)
  56 {
  57         return &(arcs_cmdline[0]);
  58 }
  59
  60 void  __init prom_init_cmdline(void)
  61 {
  62         char *cp;
  63         int actr;
  64
  65         actr = 1; /* Always ignore argv[0] */
  66
  67         cp = &(arcs_cmdline[0]);
  68         while(actr < prom_argc) {
  69                 strcpy(cp, prom_argv[actr]);
  70                 cp += strlen(prom_argv[actr]);
  71                 *cp++ = ' ';
  72                 actr++;
  73         }
  74         if (cp != &(arcs_cmdline[0])) /* get rid of trailing space */
  75                 --cp;
  76         *cp = '\0';
  77
  78 }
  79
  80
  81 char *prom_getenv(char *envname)
  82 {
  83         /*
  84          * Return a pointer to the given environment variable.
  85          * Environment variables are stored in the form of "memsize=64".
  86          */
  87
  88         t_env_var *env = (t_env_var *)prom_envp;
  89         int i;
  90
  91         i = strlen(envname);
  92
  93         while(env->name) {
  94                 if(strncmp(envname, env->name, i) == 0) {
  95                         return(env->name + strlen(envname) + 1);
  96                 }
  97                 env++;
  98         }
  99         return(NULL);
 100 }
 101
 102 static inline unsigned char str2hexnum(unsigned char c)
 103 {
 104         if(c >= '0' && c <= '9')
 105         return c - '0';
 106         if(c >= 'a' && c <= 'f')
 107         return c - 'a' + 10;
 108         return 0; /* foo */
 109 }
 110
 111 unsigned long __init prom_free_prom_memory(void)
 112 {
 113         return 0;
 114 }
 115
 116 unsigned long __init prom_get_memsize(void)
 117 {
 118         char *memsize_str;
 119         unsigned int memsize;
 120
 121         memsize_str = prom_getenv("memsize");
 122         if (!memsize_str) {
 123 #ifdef CONFIG_MIPS_ITE8172
 124                 memsize = 32;
 125 #elif defined(CONFIG_MIPS_IVR)
 126                 memsize = 64;
 127 #else
 128                 memsize = 8;
 129 #endif
 130                 printk("memsize unknown: setting to %dMB\n", memsize);
 131         } else {
 132                 printk("memsize: %s\n", memsize_str);
 133                 memsize = simple_strtol(memsize_str, NULL, 0);
 134         }
 135         return memsize;
 136 }