target/linux/ifxmips/files/arch/mips/ifxmips/prom.c

   1 /*
   2  *   arch/mips/ifxmips/prom.c
   3  *
   4  *   This program is free software; you can redistribute it and/or modify
   5  *   it under the terms of the GNU General Public License as published by
   6  *   the Free Software Foundation; either version 2 of the License, or
   7  *   (at your option) any later version.
   8  *
   9  *   This program is distributed in the hope that it will be useful,
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *   GNU General Public License for more details.
  13  *
  14  *   You should have received a copy of the GNU General Public License
  15  *   along with this program; if not, write to the Free Software
  16  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  17  *
  18  *   Copyright (C) 2005 Wu Qi Ming infineon
  19  *
  20  *   Rewrite of Infineon IFXMips code, thanks to infineon for the support,
  21  *   software and hardware
  22  *
  23  *   Copyright (C) 2007 John Crispin <blogic@openwrt.org>
  24  *
  25  */
  26
  27 #include <linux/init.h>
  28 #include <linux/bootmem.h>
  29 #include <asm/bootinfo.h>
  30 #include <asm/ifxmips/ifxmips.h>
  31
  32
  33 static char buf[1024];
  34 u32 *prom_cp1_base = NULL;
  35 u32 prom_cp1_size = 0;
  36
  37 void
  38 prom_free_prom_memory(void)
  39 {
  40 }
  41
  42 void
  43 prom_putchar(char c)
  44 {
  45         while((ifxmips_r32(IFXMIPS_ASC1_FSTAT) & ASCFSTAT_TXFFLMASK) >> ASCFSTAT_TXFFLOFF);
  46
  47         if(c == '\n')
  48                 ifxmips_w32('\r', IFXMIPS_ASC1_TBUF);
  49         ifxmips_w32(c, IFXMIPS_ASC1_TBUF);
  50 }
  51
  52 void
  53 prom_printf(const char * fmt, ...)
  54 {
  55         va_list args;
  56         int l;
  57         char *p, *buf_end;
  58
  59         va_start(args, fmt);
  60         l = vsprintf(buf, fmt, args);
  61         va_end(args);
  62         buf_end = buf + l;
  63
  64         for(p = buf; p < buf_end; p++)
  65         {
  66                 prom_putchar(*p);
  67         }
  68 }
  69
  70 u32 *prom_get_cp1_base(void)
  71 {
  72         return prom_cp1_base;
  73 }
  74
  75 u32 prom_get_cp1_size(void)
  76 {
  77         return prom_cp1_size;
  78 }
  79
  80 void __init
  81 prom_init(void)
  82 {
  83         int argc = fw_arg0;
  84         char **argv = (char **) fw_arg1;
  85         char **envp = (char **) fw_arg2;
  86
  87         int memsize = 16;
  88         int i;
  89
  90         mips_machtype = MACH_INFINEON_IFXMIPS;
  91
  92         argv = (char**)KSEG1ADDR((unsigned long)argv);
  93         arcs_cmdline[0] = '\0';
  94         for(i = 1; i < argc; i++)
  95         {
  96                 char *a = (char*)KSEG1ADDR(argv[i]);
  97                 if(!a)
  98                         continue;
  99                 if(strlen(arcs_cmdline) + strlen(a + 1) >= sizeof(arcs_cmdline))
 100                         break;
 101                 strcat(arcs_cmdline, a);
 102                 strcat(arcs_cmdline, " ");
 103         }
 104
 105         envp = (char**)KSEG1ADDR((unsigned long)envp);
 106         while(*envp)
 107         {
 108                 char *e = (char*)KSEG1ADDR(*envp);
 109
 110                 if(!strncmp(e, "memsize=", 8))
 111                 {
 112                         e += 8;
 113                         memsize = simple_strtoul(e, NULL, 10);
 114                 }
 115                 envp++;
 116         }
 117
 118         prom_cp1_size = 2;
 119         memsize -= prom_cp1_size;
 120         prom_cp1_base = (u32*)(0xA0000000 + (memsize * 1024 * 1024));
 121
 122         prom_printf(KERN_INFO "Using %dMB Ram and reserving %dMB for cp1\n", memsize, prom_cp1_size);
 123         memsize *= 1024 * 1024;
 124
 125         if(!*arcs_cmdline)
 126                 strcpy(&(arcs_cmdline[0]), "console=ttyS0,115200 rootfstype=squashfs,jffs2 init=/etc/preinit");
 127
 128         add_memory_region(0x00000000, memsize, BOOT_MEM_RAM);
 129 }