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

   1 /*
   2  *  Atheros AR71xx SoC specific prom routines
   3  *
   4  *  Copyright (C) 2008-2010 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 #include <linux/string.h>
  16
  17 #include <asm/bootinfo.h>
  18 #include <asm/addrspace.h>
  19 #include <asm/fw/myloader/myloader.h>
  20
  21 #include <asm/mach-ar71xx/ar71xx.h>
  22
  23 static inline int is_valid_ram_addr(void *addr)
  24 {
  25         if (((u32) addr > KSEG0) &&
  26             ((u32) addr < (KSEG0 + AR71XX_MEM_SIZE_MAX)))
  27                 return 1;
  28
  29         if (((u32) addr > KSEG1) &&
  30             ((u32) addr < (KSEG1 + AR71XX_MEM_SIZE_MAX)))
  31                 return 1;
  32
  33         return 0;
  34 }
  35
  36 static void __init ar71xx_prom_append_cmdline(const char *name,
  37                                               const char *value)
  38 {
  39         char buf[COMMAND_LINE_SIZE];
  40
  41         snprintf(buf, sizeof(buf), " %s=%s", name, value);
  42         strlcat(arcs_cmdline, buf, sizeof(arcs_cmdline));
  43 }
  44
  45 static const char * __init ar71xx_prom_find_env(char **envp, const char *name)
  46 {
  47         const char *ret = NULL;
  48         int len;
  49         char **p;
  50
  51         if (!is_valid_ram_addr(envp))
  52                 return NULL;
  53
  54         len = strlen(name);
  55         for (p = envp; is_valid_ram_addr(*p); p++) {
  56                 if (strncmp(name, *p, len) == 0 && (*p)[len] == '=') {
  57                         ret = *p + len + 1;
  58                         break;
  59                 }
  60
  61                 /* RedBoot env comes in pointer pairs - key, value */
  62                 if (strncmp(name, *p, len) == 0 && (*p)[len] == 0)
  63                         if (is_valid_ram_addr(*(++p))) {
  64                                 ret = *p;
  65                                 break;
  66                         }
  67         }
  68
  69         return ret;
  70 }
  71
  72 static int __init ar71xx_prom_init_myloader(void)
  73 {
  74         struct myloader_info *mylo;
  75         char mac_buf[32];
  76         char *mac;
  77
  78         mylo = myloader_get_info();
  79         if (!mylo)
  80                 return 0;
  81
  82         switch (mylo->did) {
  83         case DEVID_COMPEX_WP543:
  84                 ar71xx_prom_append_cmdline("board", "WP543");
  85                 break;
  86         default:
  87                 printk(KERN_WARNING "prom: unknown device id: %x\n",
  88                                 mylo->did);
  89                 return 0;
  90         }
  91
  92         mac = mylo->macs[0];
  93         snprintf(mac_buf, sizeof(mac_buf), "%02x:%02x:%02x:%02x:%02x:%02x",
  94                  mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
  95
  96         ar71xx_prom_append_cmdline("ethaddr", mac_buf);
  97
  98         return 1;
  99 }
 100
 101 #ifdef CONFIG_IMAGE_CMDLINE_HACK
 102 extern char __image_cmdline[];
 103
 104 static int __init ar71xx_use__image_cmdline(void)
 105 {
 106         char *p = __image_cmdline;
 107         int replace = 0;
 108
 109         if (*p == '-') {
 110                 replace = 1;
 111                 p++;
 112         }
 113
 114         if (*p == '\0')
 115                 return 0;
 116
 117         if (replace) {
 118                 strlcpy(arcs_cmdline, p, sizeof(arcs_cmdline));
 119         } else {
 120                 strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
 121                 strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
 122         }
 123
 124         return 1;
 125 }
 126 #else
 127 static int inline ar71xx_use__image_cmdline(void) { return 0; }
 128 #endif
 129
 130 static __init void ar71xx_prom_init_cmdline(int argc, char **argv)
 131 {
 132         int i;
 133
 134         if (ar71xx_use__image_cmdline())
 135                 return;
 136
 137         if (!is_valid_ram_addr(argv))
 138                 return;
 139
 140         for (i = 0; i < argc; i++)
 141                 if (is_valid_ram_addr(argv[i])) {
 142                         strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
 143                         strlcat(arcs_cmdline, argv[i], sizeof(arcs_cmdline));
 144                 }
 145 }
 146
 147 void __init prom_init(void)
 148 {
 149         const char *env;
 150         char **envp;
 151
 152         printk(KERN_DEBUG "prom: fw_arg0=%08x, fw_arg1=%08x, "
 153                         "fw_arg2=%08x, fw_arg3=%08x\n",
 154                         (unsigned int)fw_arg0, (unsigned int)fw_arg1,
 155                         (unsigned int)fw_arg2, (unsigned int)fw_arg3);
 156
 157
 158         if (ar71xx_prom_init_myloader())
 159                 return;
 160
 161         ar71xx_prom_init_cmdline(fw_arg0, (char **)fw_arg1);
 162
 163         envp = (char **)fw_arg2;
 164         if (!strstr(arcs_cmdline, "ethaddr=")) {
 165                 env = ar71xx_prom_find_env(envp, "ethaddr");
 166                 if (env)
 167                         ar71xx_prom_append_cmdline("ethaddr", env);
 168         }
 169
 170         if (!strstr(arcs_cmdline, "board=")) {
 171                 env = ar71xx_prom_find_env(envp, "board");
 172                 if (env) {
 173                         /* Workaround for buggy bootloaders */
 174                         if (strcmp(env, "RouterStation") == 0 ||
 175                             strcmp(env, "Ubiquiti AR71xx-based board") == 0)
 176                                 env = "UBNT-RS";
 177
 178                         if (strcmp(env, "RouterStation PRO") == 0)
 179                                 env = "UBNT-RSPRO";
 180
 181                         ar71xx_prom_append_cmdline("board", env);
 182                 }
 183         }
 184 }
 185
 186 void __init prom_free_prom_memory(void)
 187 {
 188         /* We do not have to prom memory to free */
 189 }