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 };
  63
  64 static __init char *ar71xx_prom_getargv(const char *name)
  65 {
  66         int len = strlen(name);
  67         int i;
  68
  69         if (!ar71xx_prom_argv)
  70                 return NULL;
  71
  72         for (i = 0; i < ar71xx_prom_argc; i++) {
  73                 char *argv = ar71xx_prom_argv[i];
  74
  75                 if (!argv)
  76                         continue;
  77
  78                 if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
  79                         return argv + len + 1;
  80         }
  81
  82         return NULL;
  83 }
  84
  85 static __init char *ar71xx_prom_getenv(const char *envname)
  86 {
  87         int len = strlen(envname);
  88         char **env;
  89
  90         if (!ar71xx_prom_envp)
  91                 return NULL;
  92
  93         for (env = ar71xx_prom_envp; *env != NULL; env++)
  94                 if (strncmp(envname, *env, len) == 0 && (*env)[len] == '=')
  95                         return *env + len + 1;
  96
  97         return NULL;
  98 }
  99
 100 static __init unsigned long find_board_byname(char *name)
 101 {
 102         int i;
 103
 104         for (i = 0; i < ARRAY_SIZE(boards); i++)
 105                 if (strcmp(name, boards[i].name) == 0)
 106                         return boards[i].mach_type;
 107
 108         return AR71XX_MACH_GENERIC;
 109 }
 110
 111 static int ar71xx_prom_init_myloader(void)
 112 {
 113         struct myloader_info *mylo;
 114
 115         mylo = myloader_get_info();
 116         if (!mylo)
 117                 return 0;
 118
 119         switch (mylo->did) {
 120         case DEVID_COMPEX_WP543:
 121                 ar71xx_mach_type = AR71XX_MACH_WP543;
 122                 break;
 123         default:
 124                 printk(KERN_WARNING "prom: unknown device id: %x\n",
 125                                 mylo->did);
 126         }
 127         ar71xx_set_mac_base(mylo->macs[0]);
 128
 129         return 1;
 130 }
 131
 132 static void ar71xx_prom_init_generic(void)
 133 {
 134         char *p;
 135
 136         ar71xx_prom_argc = fw_arg0;
 137         ar71xx_prom_argv = (char **)fw_arg1;
 138         ar71xx_prom_envp = (char **)fw_arg2;
 139
 140         p = ar71xx_prom_getenv("board");
 141         if (!p)
 142                 p = ar71xx_prom_getargv("board");
 143         if (p)
 144                 ar71xx_mach_type = find_board_byname(p);
 145
 146         p = ar71xx_prom_getenv("ethaddr");
 147         if (!p)
 148                 p = ar71xx_prom_getargv("kmac");
 149         if (p)
 150                 ar71xx_parse_mac_addr(p);
 151 }
 152
 153 void __init prom_init(void)
 154 {
 155         printk(KERN_DEBUG "prom: fw_arg0=%08x, fw_arg1=%08x, "
 156                         "fw_arg2=%08x, fw_arg3=%08x\n",
 157                         (unsigned int)fw_arg0, (unsigned int)fw_arg1,
 158                         (unsigned int)fw_arg2, (unsigned int)fw_arg3);
 159
 160         ar71xx_mach_type = AR71XX_MACH_GENERIC;
 161
 162         if (ar71xx_prom_init_myloader())
 163                 return;
 164
 165         ar71xx_prom_init_generic();
 166 }
 167
 168 void __init prom_free_prom_memory(void)
 169 {
 170         /* We do not have to prom memory to free */
 171 }
 172
 173 #define UART_READ(r) \
 174         __raw_readl((void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4 * (r)))
 175
 176 #define UART_WRITE(r, v) \
 177         __raw_writel((v), (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4*(r)))
 178
 179 void prom_putchar(unsigned char ch)
 180 {
 181         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
 182         UART_WRITE(UART_TX, ch);
 183         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
 184 }