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 };
  57
  58 static __init char *ar71xx_prom_getargv(const char *name)
  59 {
  60         int len = strlen(name);
  61         int i;
  62
  63         if (!ar71xx_prom_argv)
  64                 return NULL;
  65
  66         for (i = 0; i < ar71xx_prom_argc; i++) {
  67                 char *argv = ar71xx_prom_argv[i];
  68
  69                 if (!argv)
  70                         continue;
  71
  72                 if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
  73                         return argv + len + 1;
  74         }
  75
  76         return NULL;
  77 }
  78
  79 static __init char *ar71xx_prom_getenv(const char *envname)
  80 {
  81         int len = strlen(envname);
  82         char **env;
  83
  84         if (!ar71xx_prom_envp)
  85                 return NULL;
  86
  87         for (env = ar71xx_prom_envp; *env != NULL; env++)
  88                 if (strncmp(envname, *env, len) == 0 && (*env)[len] == '=')
  89                         return *env + len + 1;
  90
  91         return NULL;
  92 }
  93
  94 static __init unsigned long find_board_byname(char *name)
  95 {
  96         int i;
  97
  98         for (i = 0; i < ARRAY_SIZE(boards); i++)
  99                 if (strcmp(name, boards[i].name) == 0)
 100                         return boards[i].mach_type;
 101
 102         return AR71XX_MACH_GENERIC;
 103 }
 104
 105 static int ar71xx_prom_init_myloader(void)
 106 {
 107         struct myloader_info *mylo;
 108
 109         mylo = myloader_get_info();
 110         if (!mylo)
 111                 return 0;
 112
 113         switch (mylo->did) {
 114         case DEVID_COMPEX_WP543:
 115                 ar71xx_mach_type = AR71XX_MACH_WP543;
 116                 break;
 117         default:
 118                 printk(KERN_WARNING "prom: unknown device id: %x\n",
 119                                 mylo->did);
 120         }
 121         ar71xx_set_mac_base(mylo->macs[0]);
 122
 123         return 1;
 124 }
 125
 126 static void ar71xx_prom_init_generic(void)
 127 {
 128         char *p;
 129
 130         ar71xx_prom_argc = fw_arg0;
 131         ar71xx_prom_argv = (char **)fw_arg1;
 132         ar71xx_prom_envp = (char **)fw_arg2;
 133
 134         p = ar71xx_prom_getenv("board");
 135         if (!p)
 136                 p = ar71xx_prom_getargv("board");
 137         if (p)
 138                 ar71xx_mach_type = find_board_byname(p);
 139
 140         p = ar71xx_prom_getenv("ethaddr");
 141         if (!p)
 142                 p = ar71xx_prom_getargv("kmac");
 143         if (p)
 144                 ar71xx_parse_mac_addr(p);
 145 }
 146
 147 void __init prom_init(void)
 148 {
 149         printk(KERN_DEBUG "prom: fw_arg0=%08x, fw_arg1=%08x, "
 150                         "fw_arg2=%08x, fw_arg3=%08x\n",
 151                         (unsigned int)fw_arg0, (unsigned int)fw_arg1,
 152                         (unsigned int)fw_arg2, (unsigned int)fw_arg3);
 153
 154         ar71xx_mach_type = AR71XX_MACH_GENERIC;
 155
 156         if (ar71xx_prom_init_myloader())
 157                 return;
 158
 159         ar71xx_prom_init_generic();
 160 }
 161
 162 void __init prom_free_prom_memory(void)
 163 {
 164         /* We do not have to prom memory to free */
 165 }
 166
 167 #define UART_READ(r) \
 168         __raw_readl((void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4 * (r)))
 169
 170 #define UART_WRITE(r, v) \
 171         __raw_writel((v), (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4*(r)))
 172
 173 void prom_putchar(unsigned char ch)
 174 {
 175         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
 176         UART_WRITE(UART_TX, ch);
 177         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
 178 }