target/linux/ramips/files/arch/mips/ralink/common/prom.c

   1 /*
   2  *  Ralink SoC specific prom routines
   3  *
   4  *  Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify it
   7  *  under the terms of the GNU General Public License version 2 as published
   8  *  by the Free Software Foundation.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/string.h>
  14
  15 #include <asm/bootinfo.h>
  16 #include <asm/addrspace.h>
  17
  18 #include <asm/mach-ralink/common.h>
  19 #include <asm/mach-ralink/machine.h>
  20 #include <ralink_soc.h>
  21
  22 struct board_rec {
  23         char                    *name;
  24         enum ramips_mach_type   mach_type;
  25 };
  26
  27 static struct board_rec boards[] __initdata = {
  28         {
  29                 .name           = "RT-N15",
  30                 .mach_type      = RAMIPS_MACH_RT_N15,
  31         }, {
  32                 .name           = "DIR-300-revB",
  33                 .mach_type      = RAMIPS_MACH_DIR_300_REVB,
  34         }, {
  35                 .name           = "V22RW-2X2",
  36                 .mach_type      = RAMIPS_MACH_V22RW_2X2,
  37         }, {
  38                 .name           = "WHR-G300N",
  39                 .mach_type      = RAMIPS_MACH_WHR_G300N,
  40         }, {
  41                 .name           = "FONERA20N",
  42                 .mach_type      = RAMIPS_MACH_FONERA20N,
  43         }
  44 };
  45
  46 static inline void *to_ram_addr(void *addr)
  47 {
  48         u32 base;
  49
  50         base = KSEG0ADDR(RALINK_SOC_SDRAM_BASE);
  51         if (((u32) addr > base) &&
  52             ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
  53                 return addr;
  54
  55         base = KSEG1ADDR(RALINK_SOC_SDRAM_BASE);
  56         if (((u32) addr > base) &&
  57             ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
  58                 return addr;
  59
  60         /* some U-Boot variants uses physical addresses */
  61         base = RALINK_SOC_SDRAM_BASE;
  62         if (((u32) addr > base) &&
  63             ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
  64                 return (void *)KSEG0ADDR(addr);
  65
  66         return NULL;
  67 }
  68
  69 static void __init prom_append_cmdline(const char *name,
  70                                        const char *value)
  71 {
  72         char buf[CL_SIZE];
  73
  74         snprintf(buf, sizeof(buf), " %s=%s", name, value);
  75         strlcat(arcs_cmdline, buf, sizeof(arcs_cmdline));
  76 }
  77
  78 #ifdef CONFIG_IMAGE_CMDLINE_HACK
  79 extern char __image_cmdline[];
  80
  81 static int __init use_image_cmdline(void)
  82 {
  83         char *p = __image_cmdline;
  84         int replace = 0;
  85
  86         if (*p == '-') {
  87                 replace = 1;
  88                 p++;
  89         }
  90
  91         if (*p == '\0')
  92                 return 0;
  93
  94         if (replace) {
  95                 strlcpy(arcs_cmdline, p, sizeof(arcs_cmdline));
  96         } else {
  97                 strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
  98                 strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
  99         }
 100
 101         return 1;
 102 }
 103 #else
 104 static int inline use_image_cmdline(void) { return 0; }
 105 #endif
 106
 107 static __init void prom_init_cmdline(int argc, char **argv)
 108 {
 109         int i;
 110
 111         if (use_image_cmdline())
 112                 return;
 113
 114         if (!argv) {
 115                 printk(KERN_DEBUG "argv=%p is invalid, skipping\n",
 116                        argv);
 117                 return;
 118         }
 119
 120         for (i = 0; i < argc; i++) {
 121                 char *p = to_ram_addr(argv[i]);
 122
 123                 if (!p) {
 124                         printk(KERN_DEBUG
 125                                "argv[%d]=%p is invalid, skipping\n",
 126                                i, argv[i]);
 127                         continue;
 128                 }
 129
 130                 printk(KERN_DEBUG "argv[%d]: %s\n", i, p);
 131                 strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
 132                 strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
 133         }
 134 }
 135
 136 static __init char *prom_append_env(char **env, const char *envname)
 137 {
 138 #define PROM_MAX_ENVS   256
 139         int len = strlen(envname);
 140         int i;
 141
 142         if (!env) {
 143                 printk(KERN_DEBUG "env=%p is not in RAM, skipping\n",
 144                        env);
 145                 return NULL;
 146         }
 147
 148         for (i = 0; i < PROM_MAX_ENVS; i++) {
 149                 char *p = to_ram_addr(env[i]);
 150
 151                 if (!p)
 152                         break;
 153
 154                 printk(KERN_DEBUG "env[%d]: %s\n", i, p);
 155                 if (strncmp(envname, p, len) == 0 && p[len] == '=')
 156                         prom_append_cmdline(envname, p + len + 1);
 157         }
 158
 159         return NULL;
 160 #undef PROM_MAX_ENVS
 161 }
 162
 163 static __init int ramips_board_setup(char *name)
 164 {
 165         int i;
 166
 167         for (i = 0; i < ARRAY_SIZE(boards); i++)
 168                 if (strcmp(name, boards[i].name) == 0) {
 169                         ramips_mach = boards[i].mach_type;
 170                         break;
 171                 }
 172
 173         return 1;
 174 }
 175 __setup("board=", ramips_board_setup);
 176
 177 void __init prom_init(void)
 178 {
 179         int argc;
 180         char **envp;
 181         char **argv;
 182
 183         printk(KERN_DEBUG
 184                "prom: fw_arg0=%08x, fw_arg1=%08x, fw_arg2=%08x, fw_arg3=%08x\n",
 185                (unsigned int)fw_arg0, (unsigned int)fw_arg1,
 186                (unsigned int)fw_arg2, (unsigned int)fw_arg3);
 187
 188         argc = fw_arg0;
 189         argv = to_ram_addr((void *)fw_arg1);
 190         prom_init_cmdline(argc, argv);
 191
 192         envp = to_ram_addr((void *)fw_arg2);
 193         prom_append_env(envp, "board");
 194         prom_append_env(envp, "ethaddr");
 195 }
 196
 197 void __init prom_free_prom_memory(void)
 198 {
 199         /* We do not have to prom memory to free */
 200 }