target/linux/ifxmips/files-2.6.30/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/module.h>
  22 #include <linux/bootmem.h>
  23
  24 #include <asm/bootinfo.h>
  25
  26 #include <ifxmips.h>
  27
  28 static char buf[1024]; /* for prom_printf() */
  29
  30 /* for voice cpu (MIPS24K) */
  31 unsigned int *prom_cp1_base;
  32 unsigned int prom_cp1_size;
  33
  34 /* for Multithreading (APRP) on MIPS34K */
  35 unsigned long physical_memsize;
  36
  37 /* early printk on asc0 or asc1 ? */
  38 #ifdef CONFIG_IFXMIPS_PROM_ASC0
  39 #define IFXMIPS_ASC_DIFF        0
  40 #else
  41 #define IFXMIPS_ASC_DIFF        IFXMIPS_ASC_BASE_DIFF
  42 #endif
  43
  44 static inline u32 asc_r32(unsigned long r)
  45 {
  46         return ifxmips_r32((u32 *)(IFXMIPS_ASC_BASE_ADDR + IFXMIPS_ASC_DIFF + r));
  47 }
  48
  49 static inline void asc_w32(u32 v, unsigned long r)
  50 {
  51         ifxmips_w32(v, (u32 *)(IFXMIPS_ASC_BASE_ADDR + IFXMIPS_ASC_DIFF + r));
  52 }
  53
  54 void prom_free_prom_memory(void)
  55 {
  56 }
  57
  58 void prom_putchar(char c)
  59 {
  60         unsigned long flags;
  61
  62         local_irq_save(flags);
  63         while ((asc_r32(IFXMIPS_ASC_FSTAT) & ASCFSTAT_TXFFLMASK) >> ASCFSTAT_TXFFLOFF)
  64                 ;
  65
  66         if (c == '\n')
  67                 asc_w32('\r', IFXMIPS_ASC_TBUF);
  68         asc_w32(c, IFXMIPS_ASC_TBUF);
  69         local_irq_restore(flags);
  70 }
  71
  72 void prom_printf(const char *fmt, ...)
  73 {
  74         va_list args;
  75         int l;
  76         char *p, *buf_end;
  77
  78         va_start(args, fmt);
  79         l = vsprintf(buf, fmt, args);
  80         va_end(args);
  81         buf_end = buf + l;
  82
  83         for (p = buf; p < buf_end; p++)
  84                 prom_putchar(*p);
  85 }
  86
  87 unsigned int *prom_get_cp1_base(void)
  88 {
  89         return prom_cp1_base;
  90 }
  91 EXPORT_SYMBOL(prom_get_cp1_base);
  92
  93 unsigned int prom_get_cp1_size(void)
  94 {
  95         /* return size im MB */
  96         return prom_cp1_size>>20;
  97 }
  98 EXPORT_SYMBOL(prom_get_cp1_size);
  99
 100 void __init prom_init(void)
 101 {
 102         int argc = fw_arg0;
 103         char **argv = (char **) fw_arg1;
 104         char **envp = (char **) fw_arg2;
 105
 106         int memsize = 16; /* assume 16M as default */
 107         int i;
 108
 109         mips_machtype = MACH_INFINEON_IFXMIPS;
 110
 111         if (argc) {
 112                 argv = (char **)KSEG1ADDR((unsigned long)argv);
 113                 arcs_cmdline[0] = '\0';
 114                 for (i = 1; i < argc; i++) {
 115                         char *a = (char *)KSEG1ADDR(argv[i]);
 116                         if (!argv[i])
 117                                 continue;
 118                         /* for voice cpu on Twinpass/Danube */
 119                         if (cpu_data[0].cputype == CPU_24K)
 120                                 if (!strncmp(a, "cp1_size=", 9)) {
 121                                         prom_cp1_size = memparse(a + 9, &a);
 122                                         continue;
 123                                 }
 124                         if (strlen(arcs_cmdline) + strlen(a + 1) >= sizeof(arcs_cmdline)) {
 125                                 prom_printf("cmdline overflow, skipping: %s\n", a);
 126                                 break;
 127                         }
 128                         strcat(arcs_cmdline, a);
 129                         strcat(arcs_cmdline, " ");
 130                 }
 131                 if (!*arcs_cmdline)
 132                         strcpy(&(arcs_cmdline[0]),
 133                                 "console=ttyS0,115200 rootfstype=squashfs,jffs2");
 134         }
 135         envp = (char **)KSEG1ADDR((unsigned long)envp);
 136         while (*envp) {
 137                 char *e = (char *)KSEG1ADDR(*envp);
 138
 139                 if (!strncmp(e, "memsize=", 8)) {
 140                         e += 8;
 141                         memsize = simple_strtoul(e, NULL, 10);
 142                 }
 143                 envp++;
 144         }
 145         memsize *= 1024 * 1024;
 146
 147         /* only on Twinpass/Danube a second CPU is used for Voice */
 148         if ((cpu_data[0].cputype == CPU_24K) && (prom_cp1_size)) {
 149                 memsize -= prom_cp1_size;
 150                 prom_cp1_base = (unsigned int *)KSEG1ADDR(memsize);
 151
 152                 prom_printf("Using %dMB Ram and reserving %dMB for cp1\n",
 153                         memsize>>20, prom_cp1_size>>20);
 154         }
 155
 156         add_memory_region(0x00000000, memsize, BOOT_MEM_RAM);
 157 }