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

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  15  *
  16  *   Copyright (C) 2005 Wu Qi Ming infineon
  17  *   Copyright (C) 2007 John Crispin <blogic@openwrt.org>
  18  */
  19
  20 #include <linux/init.h>
  21 #include <linux/bootmem.h>
  22 #include <asm/bootinfo.h>
  23 #include <asm/ifxmips/ifxmips.h>
  24
  25 static char buf[1024];
  26 unsigned int *prom_cp1_base = NULL;
  27 unsigned int prom_cp1_size = 0;
  28
  29 static inline u32
  30 asc_r32(unsigned long r)
  31 {
  32         return ifxmips_r32((u32*)(IFXMIPS_ASC_BASE_ADDR + IFXMIPS_ASC_BASE_DIFF + r));
  33 }
  34
  35 static inline void
  36 asc_w32(u32 v, unsigned long r)
  37 {
  38         ifxmips_w32(v, (u32*)(IFXMIPS_ASC_BASE_ADDR + IFXMIPS_ASC_BASE_DIFF + r));
  39 }
  40
  41 void
  42 prom_free_prom_memory(void)
  43 {
  44 }
  45
  46 void
  47 prom_putchar(char c)
  48 {
  49         unsigned long flags;
  50
  51         local_irq_save(flags);
  52         while((asc_r32(IFXMIPS_ASC_FSTAT) & ASCFSTAT_TXFFLMASK) >> ASCFSTAT_TXFFLOFF);
  53
  54         if(c == '\n')
  55                 asc_w32('\r', IFXMIPS_ASC_TBUF);
  56         asc_w32(c, IFXMIPS_ASC_TBUF);
  57         local_irq_restore(flags);
  58 }
  59
  60 void
  61 prom_printf(const char * fmt, ...)
  62 {
  63         va_list args;
  64         int l;
  65         char *p, *buf_end;
  66
  67         va_start(args, fmt);
  68         l = vsprintf(buf, fmt, args);
  69         va_end(args);
  70         buf_end = buf + l;
  71
  72         for(p = buf; p < buf_end; p++)
  73                 prom_putchar(*p);
  74 }
  75
  76 unsigned int *prom_get_cp1_base(void)
  77 {
  78         return prom_cp1_base;
  79 }
  80
  81 unsigned int prom_get_cp1_size(void)
  82 {
  83         return prom_cp1_size;
  84 }
  85
  86 void __init
  87 prom_init(void)
  88 {
  89         int argc = fw_arg0;
  90         char **argv = (char **) fw_arg1;
  91         char **envp = (char **) fw_arg2;
  92
  93         int memsize = 16;
  94         int i;
  95
  96         mips_machtype = MACH_INFINEON_IFXMIPS;
  97
  98         argv = (char**)KSEG1ADDR((unsigned long)argv);
  99         arcs_cmdline[0] = '\0';
 100         for(i = 1; i < argc; i++)
 101         {
 102                 char *a = (char*)KSEG1ADDR(argv[i]);
 103                 if(!a)
 104                         continue;
 105                 if(strlen(arcs_cmdline) + strlen(a + 1) >= sizeof(arcs_cmdline))
 106                         break;
 107                 strcat(arcs_cmdline, a);
 108                 strcat(arcs_cmdline, " ");
 109         }
 110
 111         envp = (char**)KSEG1ADDR((unsigned long)envp);
 112         while(*envp)
 113         {
 114                 char *e = (char*)KSEG1ADDR(*envp);
 115
 116                 if(!strncmp(e, "memsize=", 8))
 117                 {
 118                         e += 8;
 119                         memsize = simple_strtoul(e, NULL, 10);
 120                 }
 121                 envp++;
 122         }
 123
 124         prom_cp1_size = 2;
 125         memsize -= prom_cp1_size;
 126         prom_cp1_base = (unsigned int*)(0xA0000000 + (memsize * 1024 * 1024));
 127
 128         prom_printf(KERN_INFO "Using %dMB Ram and reserving %dMB for cp1\n",
 129                 memsize, prom_cp1_size);
 130         memsize *= 1024 * 1024;
 131
 132         if(!*arcs_cmdline)
 133                 strcpy(&(arcs_cmdline[0]),
 134                         "console=ttyS0,115200 rootfstype=squashfs,jffs2 init=/etc/preinit");
 135
 136         add_memory_region(0x00000000, memsize, BOOT_MEM_RAM);
 137 }