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-LS-SR71",
  60                 .mach_type      = AR71XX_MACH_UBNT_LSSR71,
  61         }, {
  62                 .name           = "UBNT-LSX",
  63                 .mach_type      = AR71XX_MACH_UBNT_LSX,
  64         }, {
  65                 .name           = "WNR2000",
  66                 .mach_type      = AR71XX_MACH_WNR2000,
  67         }, {
  68                 .name           = "PB42",
  69                 .mach_type      = AR71XX_MACH_PB42,
  70         }, {
  71                 .name           = "MZK-W300NH",
  72                 .mach_type      = AR71XX_MACH_MZK_W300NH,
  73         }, {
  74                 .name           = "MZK-W04NU",
  75                 .mach_type      = AR71XX_MACH_MZK_W04NU,
  76         }
  77 };
  78
  79 static inline int is_valid_ram_addr(void *addr)
  80 {
  81         if (((u32) addr > KSEG0) &&
  82             ((u32) addr < (KSEG0 + AR71XX_MEM_SIZE_MAX)))
  83                 return 1;
  84
  85         if (((u32) addr > KSEG1) &&
  86             ((u32) addr < (KSEG1 + AR71XX_MEM_SIZE_MAX)))
  87                 return 1;
  88
  89         return 0;
  90 }
  91
  92 static __init char *ar71xx_prom_getargv(const char *name)
  93 {
  94         int len = strlen(name);
  95         int i;
  96
  97         if (!is_valid_ram_addr(ar71xx_prom_argv))
  98                 return NULL;
  99
 100         for (i = 0; i < ar71xx_prom_argc; i++) {
 101                 char *argv = ar71xx_prom_argv[i];
 102
 103                 if (!is_valid_ram_addr(argv))
 104                         continue;
 105
 106                 if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
 107                         return argv + len + 1;
 108         }
 109
 110         return NULL;
 111 }
 112
 113 static __init char *ar71xx_prom_getenv(const char *envname)
 114 {
 115         int len = strlen(envname);
 116         char **env;
 117
 118         if (!is_valid_ram_addr(ar71xx_prom_envp))
 119                 return NULL;
 120
 121         for (env = ar71xx_prom_envp; is_valid_ram_addr(*env); env++) {
 122                 if (strncmp(envname, *env, len) == 0 && (*env)[len] == '=')
 123                         return *env + len + 1;
 124
 125                 /* RedBoot env comes in pointer pairs - key, value */
 126                 if (strncmp(envname, *env, len) == 0 && (*env)[len] == 0)
 127                         if (is_valid_ram_addr(*(++env)))
 128                                 return *env;
 129         }
 130
 131         return NULL;
 132 }
 133
 134 static __init unsigned long find_board_byname(char *name)
 135 {
 136         int i;
 137
 138         for (i = 0; i < ARRAY_SIZE(boards); i++)
 139                 if (strcmp(name, boards[i].name) == 0)
 140                         return boards[i].mach_type;
 141
 142         return AR71XX_MACH_GENERIC;
 143 }
 144
 145 static int ar71xx_prom_init_myloader(void)
 146 {
 147         struct myloader_info *mylo;
 148
 149         mylo = myloader_get_info();
 150         if (!mylo)
 151                 return 0;
 152
 153         switch (mylo->did) {
 154         case DEVID_COMPEX_WP543:
 155                 ar71xx_mach_type = AR71XX_MACH_WP543;
 156                 break;
 157         default:
 158                 printk(KERN_WARNING "prom: unknown device id: %x\n",
 159                                 mylo->did);
 160         }
 161         ar71xx_set_mac_base(mylo->macs[0]);
 162
 163         return 1;
 164 }
 165
 166 static void ar71xx_prom_init_generic(void)
 167 {
 168         char *p;
 169
 170         ar71xx_prom_argc = fw_arg0;
 171         ar71xx_prom_argv = (char **)fw_arg1;
 172         ar71xx_prom_envp = (char **)fw_arg2;
 173
 174         p = ar71xx_prom_getargv("board");
 175         if (!p)
 176                 p = ar71xx_prom_getenv("board");
 177         if (p)
 178                 ar71xx_mach_type = find_board_byname(p);
 179
 180         p = ar71xx_prom_getenv("ethaddr");
 181         if (!p)
 182                 p = ar71xx_prom_getargv("kmac");
 183         if (p)
 184                 ar71xx_parse_mac_addr(p);
 185 }
 186
 187 void __init prom_init(void)
 188 {
 189         printk(KERN_DEBUG "prom: fw_arg0=%08x, fw_arg1=%08x, "
 190                         "fw_arg2=%08x, fw_arg3=%08x\n",
 191                         (unsigned int)fw_arg0, (unsigned int)fw_arg1,
 192                         (unsigned int)fw_arg2, (unsigned int)fw_arg3);
 193
 194         ar71xx_mach_type = AR71XX_MACH_GENERIC;
 195
 196         if (ar71xx_prom_init_myloader())
 197                 return;
 198
 199         ar71xx_prom_init_generic();
 200 }
 201
 202 void __init prom_free_prom_memory(void)
 203 {
 204         /* We do not have to prom memory to free */
 205 }
 206
 207 #define UART_READ(r) \
 208         __raw_readl((void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4 * (r)))
 209
 210 #define UART_WRITE(r, v) \
 211         __raw_writel((v), (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4*(r)))
 212
 213 void prom_putchar(unsigned char ch)
 214 {
 215         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
 216         UART_WRITE(UART_TX, ch);
 217         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
 218 }