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

   1 /*
   2  *  Atheros AR71xx SoC specific prom routines
   3  *
   4  *  Copyright (C) 2008 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 };
  69
  70 static __init char *ar71xx_prom_getargv(const char *name)
  71 {
  72         int len = strlen(name);
  73         int i;
  74
  75         if (!ar71xx_prom_argv)
  76                 return NULL;
  77
  78         for (i = 0; i < ar71xx_prom_argc; i++) {
  79                 char *argv = ar71xx_prom_argv[i];
  80
  81                 if (!argv)
  82                         continue;
  83
  84                 if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
  85                         return argv + len + 1;
  86         }
  87
  88         return NULL;
  89 }
  90
  91 static __init char *ar71xx_prom_getenv(const char *envname)
  92 {
  93         int len = strlen(envname);
  94         char **env;
  95
  96         if (!ar71xx_prom_envp)
  97                 return NULL;
  98
  99         for (env = ar71xx_prom_envp; *env != NULL; env++)
 100                 if (strncmp(envname, *env, len) == 0 && (*env)[len] == '=')
 101                         return *env + len + 1;
 102
 103         return NULL;
 104 }
 105
 106 static __init unsigned long find_board_byname(char *name)
 107 {
 108         int i;
 109
 110         for (i = 0; i < ARRAY_SIZE(boards); i++)
 111                 if (strcmp(name, boards[i].name) == 0)
 112                         return boards[i].mach_type;
 113
 114         return AR71XX_MACH_GENERIC;
 115 }
 116
 117 static int ar71xx_prom_init_myloader(void)
 118 {
 119         struct myloader_info *mylo;
 120
 121         mylo = myloader_get_info();
 122         if (!mylo)
 123                 return 0;
 124
 125         switch (mylo->did) {
 126         case DEVID_COMPEX_WP543:
 127                 ar71xx_mach_type = AR71XX_MACH_WP543;
 128                 break;
 129         default:
 130                 printk(KERN_WARNING "prom: unknown device id: %x\n",
 131                                 mylo->did);
 132         }
 133         ar71xx_set_mac_base(mylo->macs[0]);
 134
 135         return 1;
 136 }
 137
 138 static void ar71xx_prom_init_generic(void)
 139 {
 140         char *p;
 141
 142         ar71xx_prom_argc = fw_arg0;
 143         ar71xx_prom_argv = (char **)fw_arg1;
 144         ar71xx_prom_envp = (char **)fw_arg2;
 145
 146         p = ar71xx_prom_getenv("board");
 147         if (!p)
 148                 p = ar71xx_prom_getargv("board");
 149         if (p)
 150                 ar71xx_mach_type = find_board_byname(p);
 151
 152         p = ar71xx_prom_getenv("ethaddr");
 153         if (!p)
 154                 p = ar71xx_prom_getargv("kmac");
 155         if (p)
 156                 ar71xx_parse_mac_addr(p);
 157 }
 158
 159 void __init prom_init(void)
 160 {
 161         printk(KERN_DEBUG "prom: fw_arg0=%08x, fw_arg1=%08x, "
 162                         "fw_arg2=%08x, fw_arg3=%08x\n",
 163                         (unsigned int)fw_arg0, (unsigned int)fw_arg1,
 164                         (unsigned int)fw_arg2, (unsigned int)fw_arg3);
 165
 166         ar71xx_mach_type = AR71XX_MACH_GENERIC;
 167
 168         if (ar71xx_prom_init_myloader())
 169                 return;
 170
 171         ar71xx_prom_init_generic();
 172 }
 173
 174 void __init prom_free_prom_memory(void)
 175 {
 176         /* We do not have to prom memory to free */
 177 }
 178
 179 #define UART_READ(r) \
 180         __raw_readl((void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4 * (r)))
 181
 182 #define UART_WRITE(r, v) \
 183         __raw_writel((v), (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4*(r)))
 184
 185 void prom_putchar(unsigned char ch)
 186 {
 187         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
 188         UART_WRITE(UART_TX, ch);
 189         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
 190 }