target/linux/ar71xx/files/arch/mips/ar71xx/prom.c

   1 /*
   2  *  Atheros AR71xx SoC specific prom routines
   3  *
   4  *  Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
   5  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify it
   8  *  under the terms of the GNU General Public License version 2 as published
   9  *  by the Free Software Foundation.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/io.h>
  15
  16 #include <asm/bootinfo.h>
  17 #include <asm/addrspace.h>
  18 #include <asm/fw/myloader/myloader.h>
  19
  20 #include <asm/mach-ar71xx/ar71xx.h>
  21
  22 #include "devices.h"
  23
  24 struct board_rec {
  25         char                    *name;
  26         enum ar71xx_mach_type   mach_type;
  27 };
  28
  29 static int ar71xx_prom_argc __initdata;
  30 static char **ar71xx_prom_argv __initdata;
  31 static char **ar71xx_prom_envp __initdata;
  32
  33 static struct board_rec boards[] __initdata = {
  34         {
  35                 .name           = "411",
  36                 .mach_type      = AR71XX_MACH_RB_411,
  37         }, {
  38                 .name           = "433",
  39                 .mach_type      = AR71XX_MACH_RB_433,
  40         }, {
  41                 .name           = "433U",
  42                 .mach_type      = AR71XX_MACH_RB_433U,
  43         }, {
  44                 .name           = "450",
  45                 .mach_type      = AR71XX_MACH_RB_450,
  46         }, {
  47                 .name           = "450G",
  48                 .mach_type      = AR71XX_MACH_RB_450G,
  49         }, {
  50                 .name           = "493",
  51                 .mach_type      = AR71XX_MACH_RB_493,
  52         }, {
  53                 .name           = "AP81",
  54                 .mach_type      = AR71XX_MACH_AP81,
  55         }, {
  56                 .name           = "AP83",
  57                 .mach_type      = AR71XX_MACH_AP83,
  58         }, {
  59                 .name           = "AW-NR580",
  60                 .mach_type      = AR71XX_MACH_AW_NR580,
  61         }, {
  62                 .name           = "TEW-632BRP",
  63                 .mach_type      = AR71XX_MACH_TEW_632BRP,
  64         }, {
  65                 .name           = "TL-WR741ND",
  66                 .mach_type      = AR71XX_MACH_TL_WR741ND,
  67         }, {
  68                 .name           = "TL-WR941ND",
  69                 .mach_type      = AR71XX_MACH_TL_WR941ND,
  70         }, {
  71                 .name           = "UBNT-RS",
  72                 .mach_type      = AR71XX_MACH_UBNT_RS,
  73         }, {
  74                 .name           = "UBNT-RSPRO",
  75                 .mach_type      = AR71XX_MACH_UBNT_RSPRO,
  76         }, {
  77                 .name           = "Ubiquiti AR71xx-based board",
  78                 .mach_type      = AR71XX_MACH_UBNT_RS,
  79         }, {
  80                 .name           = "UBNT-LS-SR71",
  81                 .mach_type      = AR71XX_MACH_UBNT_LSSR71,
  82         }, {
  83                 .name           = "UBNT-LSX",
  84                 .mach_type      = AR71XX_MACH_UBNT_LSX,
  85         }, {
  86                 .name           = "WNR2000",
  87                 .mach_type      = AR71XX_MACH_WNR2000,
  88         }, {
  89                 .name           = "WRT160NL",
  90                 .mach_type      = AR71XX_MACH_WRT160NL,
  91         }, {
  92                 .name           = "WRT400N",
  93                 .mach_type      = AR71XX_MACH_WRT400N,
  94         }, {
  95                 .name           = "PB42",
  96                 .mach_type      = AR71XX_MACH_PB42,
  97         }, {
  98                 .name           = "PB44",
  99                 .mach_type      = AR71XX_MACH_PB44,
 100         }, {
 101                 .name           = "MZK-W300NH",
 102                 .mach_type      = AR71XX_MACH_MZK_W300NH,
 103         }, {
 104                 .name           = "MZK-W04NU",
 105                 .mach_type      = AR71XX_MACH_MZK_W04NU,
 106         }
 107 };
 108
 109 static inline int is_valid_ram_addr(void *addr)
 110 {
 111         if (((u32) addr > KSEG0) &&
 112             ((u32) addr < (KSEG0 + AR71XX_MEM_SIZE_MAX)))
 113                 return 1;
 114
 115         if (((u32) addr > KSEG1) &&
 116             ((u32) addr < (KSEG1 + AR71XX_MEM_SIZE_MAX)))
 117                 return 1;
 118
 119         return 0;
 120 }
 121
 122 static __init char *ar71xx_prom_getargv(const char *name)
 123 {
 124         int len = strlen(name);
 125         int i;
 126
 127         if (!is_valid_ram_addr(ar71xx_prom_argv))
 128                 return NULL;
 129
 130         for (i = 0; i < ar71xx_prom_argc; i++) {
 131                 char *argv = ar71xx_prom_argv[i];
 132
 133                 if (!is_valid_ram_addr(argv))
 134                         continue;
 135
 136                 if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
 137                         return argv + len + 1;
 138         }
 139
 140         return NULL;
 141 }
 142
 143 static __init char *ar71xx_prom_getenv(const char *envname)
 144 {
 145         int len = strlen(envname);
 146         char **env;
 147
 148         if (!is_valid_ram_addr(ar71xx_prom_envp))
 149                 return NULL;
 150
 151         for (env = ar71xx_prom_envp; is_valid_ram_addr(*env); env++) {
 152                 if (strncmp(envname, *env, len) == 0 && (*env)[len] == '=')
 153                         return *env + len + 1;
 154
 155                 /* RedBoot env comes in pointer pairs - key, value */
 156                 if (strncmp(envname, *env, len) == 0 && (*env)[len] == 0)
 157                         if (is_valid_ram_addr(*(++env)))
 158                                 return *env;
 159         }
 160
 161         return NULL;
 162 }
 163
 164 static __init unsigned long find_board_byname(char *name)
 165 {
 166         int i;
 167
 168         for (i = 0; i < ARRAY_SIZE(boards); i++)
 169                 if (strcmp(name, boards[i].name) == 0)
 170                         return boards[i].mach_type;
 171
 172         return AR71XX_MACH_GENERIC;
 173 }
 174
 175 static int ar71xx_prom_init_myloader(void)
 176 {
 177         struct myloader_info *mylo;
 178
 179         mylo = myloader_get_info();
 180         if (!mylo)
 181                 return 0;
 182
 183         switch (mylo->did) {
 184         case DEVID_COMPEX_WP543:
 185                 ar71xx_mach = AR71XX_MACH_WP543;
 186                 break;
 187         default:
 188                 printk(KERN_WARNING "prom: unknown device id: %x\n",
 189                                 mylo->did);
 190         }
 191         ar71xx_set_mac_base(mylo->macs[0]);
 192
 193         return 1;
 194 }
 195
 196 static void ar71xx_prom_init_generic(void)
 197 {
 198         char *p;
 199
 200         ar71xx_prom_argc = fw_arg0;
 201         ar71xx_prom_argv = (char **)fw_arg1;
 202         ar71xx_prom_envp = (char **)fw_arg2;
 203
 204         p = ar71xx_prom_getargv("board");
 205         if (!p)
 206                 p = ar71xx_prom_getenv("board");
 207         if (p)
 208                 ar71xx_mach = find_board_byname(p);
 209
 210         p = ar71xx_prom_getenv("ethaddr");
 211         if (!p)
 212                 p = ar71xx_prom_getargv("kmac");
 213         if (p)
 214                 ar71xx_parse_mac_addr(p);
 215 }
 216
 217 void __init prom_init(void)
 218 {
 219         printk(KERN_DEBUG "prom: fw_arg0=%08x, fw_arg1=%08x, "
 220                         "fw_arg2=%08x, fw_arg3=%08x\n",
 221                         (unsigned int)fw_arg0, (unsigned int)fw_arg1,
 222                         (unsigned int)fw_arg2, (unsigned int)fw_arg3);
 223
 224         ar71xx_mach = AR71XX_MACH_GENERIC;
 225
 226         if (ar71xx_prom_init_myloader())
 227                 return;
 228
 229         ar71xx_prom_init_generic();
 230 }
 231
 232 void __init prom_free_prom_memory(void)
 233 {
 234         /* We do not have to prom memory to free */
 235 }