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
  23 #include "devices.h"
  24
  25 struct board_rec {
  26         char                    *name;
  27         enum ar71xx_mach_type   mach_type;
  28 };
  29
  30 static int ar71xx_prom_argc __initdata;
  31 static char **ar71xx_prom_argv __initdata;
  32 static char **ar71xx_prom_envp __initdata;
  33
  34 static struct board_rec boards[] __initdata = {
  35         {
  36                 .name           = "411",
  37                 .mach_type      = AR71XX_MACH_RB_411,
  38         }, {
  39                 .name           = "433",
  40                 .mach_type      = AR71XX_MACH_RB_433,
  41         }, {
  42                 .name           = "450",
  43                 .mach_type      = AR71XX_MACH_RB_450,
  44         }, {
  45                 .name           = "493",
  46                 .mach_type      = AR71XX_MACH_RB_493,
  47         }, {
  48                 .name           = "AP81",
  49                 .mach_type      = AR71XX_MACH_AP81,
  50         }, {
  51                 .name           = "AP83",
  52                 .mach_type      = AR71XX_MACH_AP83,
  53         }, {
  54                 .name           = "AW-NR580",
  55                 .mach_type      = AR71XX_MACH_AW_NR580,
  56         }, {
  57                 .name           = "TEW-632BRP",
  58                 .mach_type      = AR71XX_MACH_TEW_632BRP,
  59         }, {
  60                 .name           = "TL-WR941ND",
  61                 .mach_type      = AR71XX_MACH_TL_WR941ND,
  62         }, {
  63                 .name           = "UBNT-RS",
  64                 .mach_type      = AR71XX_MACH_UBNT_RS,
  65         }, {
  66                 .name           = "UBNT-RSPRO",
  67                 .mach_type      = AR71XX_MACH_UBNT_RSPRO,
  68         }, {
  69                 .name           = "Ubiquiti AR71xx-based board",
  70                 .mach_type      = AR71XX_MACH_UBNT_RS,
  71         }, {
  72                 .name           = "UBNT-LS-SR71",
  73                 .mach_type      = AR71XX_MACH_UBNT_LSSR71,
  74         }, {
  75                 .name           = "UBNT-LSX",
  76                 .mach_type      = AR71XX_MACH_UBNT_LSX,
  77         }, {
  78                 .name           = "WNR2000",
  79                 .mach_type      = AR71XX_MACH_WNR2000,
  80         }, {
  81                 .name           = "WRT160NL",
  82                 .mach_type      = AR71XX_MACH_WRT160NL,
  83         }, {
  84                 .name           = "WRT400N",
  85                 .mach_type      = AR71XX_MACH_WRT400N,
  86         }, {
  87                 .name           = "PB42",
  88                 .mach_type      = AR71XX_MACH_PB42,
  89         }, {
  90                 .name           = "PB44",
  91                 .mach_type      = AR71XX_MACH_PB44,
  92         }, {
  93                 .name           = "MZK-W300NH",
  94                 .mach_type      = AR71XX_MACH_MZK_W300NH,
  95         }, {
  96                 .name           = "MZK-W04NU",
  97                 .mach_type      = AR71XX_MACH_MZK_W04NU,
  98         }
  99 };
 100
 101 static inline int is_valid_ram_addr(void *addr)
 102 {
 103         if (((u32) addr > KSEG0) &&
 104             ((u32) addr < (KSEG0 + AR71XX_MEM_SIZE_MAX)))
 105                 return 1;
 106
 107         if (((u32) addr > KSEG1) &&
 108             ((u32) addr < (KSEG1 + AR71XX_MEM_SIZE_MAX)))
 109                 return 1;
 110
 111         return 0;
 112 }
 113
 114 static __init char *ar71xx_prom_getargv(const char *name)
 115 {
 116         int len = strlen(name);
 117         int i;
 118
 119         if (!is_valid_ram_addr(ar71xx_prom_argv))
 120                 return NULL;
 121
 122         for (i = 0; i < ar71xx_prom_argc; i++) {
 123                 char *argv = ar71xx_prom_argv[i];
 124
 125                 if (!is_valid_ram_addr(argv))
 126                         continue;
 127
 128                 if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
 129                         return argv + len + 1;
 130         }
 131
 132         return NULL;
 133 }
 134
 135 static __init char *ar71xx_prom_getenv(const char *envname)
 136 {
 137         int len = strlen(envname);
 138         char **env;
 139
 140         if (!is_valid_ram_addr(ar71xx_prom_envp))
 141                 return NULL;
 142
 143         for (env = ar71xx_prom_envp; is_valid_ram_addr(*env); env++) {
 144                 if (strncmp(envname, *env, len) == 0 && (*env)[len] == '=')
 145                         return *env + len + 1;
 146
 147                 /* RedBoot env comes in pointer pairs - key, value */
 148                 if (strncmp(envname, *env, len) == 0 && (*env)[len] == 0)
 149                         if (is_valid_ram_addr(*(++env)))
 150                                 return *env;
 151         }
 152
 153         return NULL;
 154 }
 155
 156 static __init unsigned long find_board_byname(char *name)
 157 {
 158         int i;
 159
 160         for (i = 0; i < ARRAY_SIZE(boards); i++)
 161                 if (strcmp(name, boards[i].name) == 0)
 162                         return boards[i].mach_type;
 163
 164         return AR71XX_MACH_GENERIC;
 165 }
 166
 167 static int ar71xx_prom_init_myloader(void)
 168 {
 169         struct myloader_info *mylo;
 170
 171         mylo = myloader_get_info();
 172         if (!mylo)
 173                 return 0;
 174
 175         switch (mylo->did) {
 176         case DEVID_COMPEX_WP543:
 177                 ar71xx_mach = AR71XX_MACH_WP543;
 178                 break;
 179         default:
 180                 printk(KERN_WARNING "prom: unknown device id: %x\n",
 181                                 mylo->did);
 182         }
 183         ar71xx_set_mac_base(mylo->macs[0]);
 184
 185         return 1;
 186 }
 187
 188 static void ar71xx_prom_init_generic(void)
 189 {
 190         char *p;
 191
 192         ar71xx_prom_argc = fw_arg0;
 193         ar71xx_prom_argv = (char **)fw_arg1;
 194         ar71xx_prom_envp = (char **)fw_arg2;
 195
 196         p = ar71xx_prom_getargv("board");
 197         if (!p)
 198                 p = ar71xx_prom_getenv("board");
 199         if (p)
 200                 ar71xx_mach = find_board_byname(p);
 201
 202         p = ar71xx_prom_getenv("ethaddr");
 203         if (!p)
 204                 p = ar71xx_prom_getargv("kmac");
 205         if (p)
 206                 ar71xx_parse_mac_addr(p);
 207 }
 208
 209 void __init prom_init(void)
 210 {
 211         printk(KERN_DEBUG "prom: fw_arg0=%08x, fw_arg1=%08x, "
 212                         "fw_arg2=%08x, fw_arg3=%08x\n",
 213                         (unsigned int)fw_arg0, (unsigned int)fw_arg1,
 214                         (unsigned int)fw_arg2, (unsigned int)fw_arg3);
 215
 216         ar71xx_mach = AR71XX_MACH_GENERIC;
 217
 218         if (ar71xx_prom_init_myloader())
 219                 return;
 220
 221         ar71xx_prom_init_generic();
 222 }
 223
 224 void __init prom_free_prom_memory(void)
 225 {
 226         /* We do not have to prom memory to free */
 227 }
 228
 229 #define UART_READ(r) \
 230         __raw_readl((void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4 * (r)))
 231
 232 #define UART_WRITE(r, v) \
 233         __raw_writel((v), (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4*(r)))
 234
 235 void prom_putchar(unsigned char ch)
 236 {
 237         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
 238         UART_WRITE(UART_TX, ch);
 239         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
 240 }