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 #include <linux/serial_reg.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 #include <asm/mach-ar71xx/platform.h>
  23
  24 struct board_rec {
  25         char            *name;
  26         unsigned long   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           = "450",
  42                 .mach_type      = AR71XX_MACH_RB_450,
  43         }, {
  44                 .name           = "493",
  45                 .mach_type      = AR71XX_MACH_RB_493,
  46         }, {
  47                 .name           = "AW-NR580",
  48                 .mach_type      = AR71XX_MACH_AW_NR580,
  49         }, {
  50                 .name           = "AP83",
  51                 .mach_type      = AR71XX_MACH_AP83,
  52         }, {
  53                 .name           = "TEW-632BRP",
  54                 .mach_type      = AR71XX_MACH_TEW_632BRP,
  55         }, {
  56                 .name           = "UBNT-RS",
  57                 .mach_type      = AR71XX_MACH_UBNT_RS,
  58         }, {
  59                 .name           = "UBNT-LSX",
  60                 .mach_type      = AR71XX_MACH_UBNT_LSX,
  61         }, {
  62                 .name           = "WNR2000",
  63                 .mach_type      = AR71XX_MACH_WNR2000,
  64         }, {
  65                 .name           = "PB42",
  66                 .mach_type      = AR71XX_MACH_PB42,
  67         }, {
  68                 .name           = "MZK-W300NH",
  69                 .mach_type      = AR71XX_MACH_MZK_W300NH,
  70         }, {
  71                 .name           = "MZK-W04NU",
  72                 .mach_type      = AR71XX_MACH_MZK_W04NU,
  73         }
  74 };
  75
  76 static __init char *ar71xx_prom_getargv(const char *name)
  77 {
  78         int len = strlen(name);
  79         int i;
  80
  81         if (!ar71xx_prom_argv)
  82                 return NULL;
  83
  84         for (i = 0; i < ar71xx_prom_argc; i++) {
  85                 char *argv = ar71xx_prom_argv[i];
  86
  87                 if (!argv)
  88                         continue;
  89
  90                 if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
  91                         return argv + len + 1;
  92         }
  93
  94         return NULL;
  95 }
  96
  97 static __init char *ar71xx_prom_getenv(const char *envname)
  98 {
  99         int len = strlen(envname);
 100         char **env;
 101
 102         if (!ar71xx_prom_envp)
 103                 return NULL;
 104
 105         for (env = ar71xx_prom_envp; *env != NULL; env++)
 106                 if (strncmp(envname, *env, len) == 0 && (*env)[len] == '=')
 107                         return *env + len + 1;
 108
 109         return NULL;
 110 }
 111
 112 static __init unsigned long find_board_byname(char *name)
 113 {
 114         int i;
 115
 116         for (i = 0; i < ARRAY_SIZE(boards); i++)
 117                 if (strcmp(name, boards[i].name) == 0)
 118                         return boards[i].mach_type;
 119
 120         return AR71XX_MACH_GENERIC;
 121 }
 122
 123 static int ar71xx_prom_init_myloader(void)
 124 {
 125         struct myloader_info *mylo;
 126
 127         mylo = myloader_get_info();
 128         if (!mylo)
 129                 return 0;
 130
 131         switch (mylo->did) {
 132         case DEVID_COMPEX_WP543:
 133                 ar71xx_mach_type = AR71XX_MACH_WP543;
 134                 break;
 135         default:
 136                 printk(KERN_WARNING "prom: unknown device id: %x\n",
 137                                 mylo->did);
 138         }
 139         ar71xx_set_mac_base(mylo->macs[0]);
 140
 141         return 1;
 142 }
 143
 144 static void ar71xx_prom_init_generic(void)
 145 {
 146         char *p;
 147
 148         ar71xx_prom_argc = fw_arg0;
 149         ar71xx_prom_argv = (char **)fw_arg1;
 150         ar71xx_prom_envp = (char **)fw_arg2;
 151
 152         p = ar71xx_prom_getenv("board");
 153         if (!p)
 154                 p = ar71xx_prom_getargv("board");
 155         if (p)
 156                 ar71xx_mach_type = find_board_byname(p);
 157
 158         p = ar71xx_prom_getenv("ethaddr");
 159         if (!p)
 160                 p = ar71xx_prom_getargv("kmac");
 161         if (p)
 162                 ar71xx_parse_mac_addr(p);
 163 }
 164
 165 void __init prom_init(void)
 166 {
 167         printk(KERN_DEBUG "prom: fw_arg0=%08x, fw_arg1=%08x, "
 168                         "fw_arg2=%08x, fw_arg3=%08x\n",
 169                         (unsigned int)fw_arg0, (unsigned int)fw_arg1,
 170                         (unsigned int)fw_arg2, (unsigned int)fw_arg3);
 171
 172         ar71xx_mach_type = AR71XX_MACH_GENERIC;
 173
 174         if (ar71xx_prom_init_myloader())
 175                 return;
 176
 177         ar71xx_prom_init_generic();
 178 }
 179
 180 void __init prom_free_prom_memory(void)
 181 {
 182         /* We do not have to prom memory to free */
 183 }
 184
 185 #define UART_READ(r) \
 186         __raw_readl((void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4 * (r)))
 187
 188 #define UART_WRITE(r, v) \
 189         __raw_writel((v), (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4*(r)))
 190
 191 void prom_putchar(unsigned char ch)
 192 {
 193         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
 194         UART_WRITE(UART_TX, ch);
 195         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
 196 }