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/module.h>
  22 #include <linux/bootmem.h>
  23 #include <asm/bootinfo.h>
  24 #include <asm/ifxmips/ifxmips.h>
  25
  26 static char buf[1024]; /* for prom_printf() */
  27
  28 /* for voice cpu (MIPS24K) */
  29 unsigned int *prom_cp1_base = NULL;
  30 unsigned int prom_cp1_size = 0;
  31
  32 /* for Multithreading (APRP) on MIPS34K */
  33 unsigned long physical_memsize = 0L;
  34
  35 #ifdef IFXMIPS_PROM_ASC0
  36 #define IFXMIPS_ASC_DIFF        0
  37 #else
  38 #define IFXMIPS_ASC_DIFF        IFXMIPS_ASC_BASE_DIFF
  39 #endif
  40
  41 static inline u32 asc_r32(unsigned long r)
  42 {
  43         return ifxmips_r32((u32 *)(IFXMIPS_ASC_BASE_ADDR + IFXMIPS_ASC_DIFF + r));
  44 }
  45
  46 static inline void asc_w32(u32 v, unsigned long r)
  47 {
  48         ifxmips_w32(v, (u32 *)(IFXMIPS_ASC_BASE_ADDR + IFXMIPS_ASC_DIFF + r));
  49 }
  50
  51 void prom_free_prom_memory(void)
  52 {
  53 }
  54
  55 void prom_putchar(char c)
  56 {
  57         unsigned long flags;
  58
  59         local_irq_save(flags);
  60         while((asc_r32(IFXMIPS_ASC_FSTAT) & ASCFSTAT_TXFFLMASK) >> ASCFSTAT_TXFFLOFF);
  61
  62         if (c == '\n')
  63                 asc_w32('\r', IFXMIPS_ASC_TBUF);
  64         asc_w32(c, IFXMIPS_ASC_TBUF);
  65         local_irq_restore(flags);
  66 }
  67
  68 void prom_printf(const char *fmt, ...)
  69 {
  70         va_list args;
  71         int l;
  72         char *p, *buf_end;
  73
  74         va_start(args, fmt);
  75         l = vsprintf(buf, fmt, args);
  76         va_end(args);
  77         buf_end = buf + l;
  78
  79         for (p = buf; p < buf_end; p++)
  80                 prom_putchar(*p);
  81 }
  82
  83 unsigned int *prom_get_cp1_base(void)
  84 {
  85         return prom_cp1_base;
  86 }
  87 EXPORT_SYMBOL(prom_get_cp1_base);
  88
  89 unsigned int prom_get_cp1_size(void)
  90 {
  91         /* return size im MB */
  92         return prom_cp1_size>>20;
  93 }
  94 EXPORT_SYMBOL(prom_get_cp1_size);
  95
  96 void __init prom_init(void)
  97 {
  98         int argc = fw_arg0;
  99         char **argv = (char **) fw_arg1;
 100         char **envp = (char **) fw_arg2;
 101
 102         int memsize = 16; /* assume 16M as default */
 103         int i;
 104
 105         mips_machtype = MACH_INFINEON_IFXMIPS;
 106
 107         if (argc) {
 108                 argv = (char**)KSEG1ADDR((unsigned long)argv);
 109                 arcs_cmdline[0] = '\0';
 110                 for (i = 1; i < argc; i++)
 111                 {
 112                         char *a = (char *)KSEG1ADDR(argv[i]);
 113                         if (!argv[i])
 114                                 continue;
 115                         /* for voice cpu on Twinpass/Danube */
 116                         if (cpu_data[0].cputype == CPU_24K)
 117                                 if (!strncmp(a, "cp1_size=", 9)) {
 118                                         prom_cp1_size = memparse(a + 9, &a);
 119                                         continue;
 120                                 }
 121                         if (strlen(arcs_cmdline) + strlen(a + 1) >= sizeof(arcs_cmdline)) {
 122                                 prom_printf("cmdline overflow, skipping: %s\n", a);
 123                                 break;
 124                         }
 125                         strcat(arcs_cmdline, a);
 126                         strcat(arcs_cmdline, " ");
 127                 }
 128                 if (!*arcs_cmdline)
 129                         strcpy(&(arcs_cmdline[0]),
 130                                 "console=ttyS0,115200 rootfstype=squashfs,jffs2 init=/etc/preinit");
 131         }
 132         envp = (char**)KSEG1ADDR((unsigned long)envp);
 133         while(*envp)
 134         {
 135                 char *e = (char *)KSEG1ADDR(*envp);
 136
 137                 if (!strncmp(e, "memsize=", 8))
 138                 {
 139                         e += 8;
 140                         memsize = simple_strtoul(e, NULL, 10);
 141                 }
 142                 envp++;
 143         }
 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 }