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-WR741ND",
  61                 .mach_type      = AR71XX_MACH_TL_WR741ND,
  62         }, {
  63                 .name           = "TL-WR941ND",
  64                 .mach_type      = AR71XX_MACH_TL_WR941ND,
  65         }, {
  66                 .name           = "UBNT-RS",
  67                 .mach_type      = AR71XX_MACH_UBNT_RS,
  68         }, {
  69                 .name           = "UBNT-RSPRO",
  70                 .mach_type      = AR71XX_MACH_UBNT_RSPRO,
  71         }, {
  72                 .name           = "Ubiquiti AR71xx-based board",
  73                 .mach_type      = AR71XX_MACH_UBNT_RS,
  74         }, {
  75                 .name           = "UBNT-LS-SR71",
  76                 .mach_type      = AR71XX_MACH_UBNT_LSSR71,
  77         }, {
  78                 .name           = "UBNT-LSX",
  79                 .mach_type      = AR71XX_MACH_UBNT_LSX,
  80         }, {
  81                 .name           = "WNR2000",
  82                 .mach_type      = AR71XX_MACH_WNR2000,
  83         }, {
  84                 .name           = "WRT160NL",
  85                 .mach_type      = AR71XX_MACH_WRT160NL,
  86         }, {
  87                 .name           = "WRT400N",
  88                 .mach_type      = AR71XX_MACH_WRT400N,
  89         }, {
  90                 .name           = "PB42",
  91                 .mach_type      = AR71XX_MACH_PB42,
  92         }, {
  93                 .name           = "PB44",
  94                 .mach_type      = AR71XX_MACH_PB44,
  95         }, {
  96                 .name           = "MZK-W300NH",
  97                 .mach_type      = AR71XX_MACH_MZK_W300NH,
  98         }, {
  99                 .name           = "MZK-W04NU",
 100                 .mach_type      = AR71XX_MACH_MZK_W04NU,
 101         }
 102 };
 103
 104 static inline int is_valid_ram_addr(void *addr)
 105 {
 106         if (((u32) addr > KSEG0) &&
 107             ((u32) addr < (KSEG0 + AR71XX_MEM_SIZE_MAX)))
 108                 return 1;
 109
 110         if (((u32) addr > KSEG1) &&
 111             ((u32) addr < (KSEG1 + AR71XX_MEM_SIZE_MAX)))
 112                 return 1;
 113
 114         return 0;
 115 }
 116
 117 static __init char *ar71xx_prom_getargv(const char *name)
 118 {
 119         int len = strlen(name);
 120         int i;
 121
 122         if (!is_valid_ram_addr(ar71xx_prom_argv))
 123                 return NULL;
 124
 125         for (i = 0; i < ar71xx_prom_argc; i++) {
 126                 char *argv = ar71xx_prom_argv[i];
 127
 128                 if (!is_valid_ram_addr(argv))
 129                         continue;
 130
 131                 if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
 132                         return argv + len + 1;
 133         }
 134
 135         return NULL;
 136 }
 137
 138 static __init char *ar71xx_prom_getenv(const char *envname)
 139 {
 140         int len = strlen(envname);
 141         char **env;
 142
 143         if (!is_valid_ram_addr(ar71xx_prom_envp))
 144                 return NULL;
 145
 146         for (env = ar71xx_prom_envp; is_valid_ram_addr(*env); env++) {
 147                 if (strncmp(envname, *env, len) == 0 && (*env)[len] == '=')
 148                         return *env + len + 1;
 149
 150                 /* RedBoot env comes in pointer pairs - key, value */
 151                 if (strncmp(envname, *env, len) == 0 && (*env)[len] == 0)
 152                         if (is_valid_ram_addr(*(++env)))
 153                                 return *env;
 154         }
 155
 156         return NULL;
 157 }
 158
 159 static __init unsigned long find_board_byname(char *name)
 160 {
 161         int i;
 162
 163         for (i = 0; i < ARRAY_SIZE(boards); i++)
 164                 if (strcmp(name, boards[i].name) == 0)
 165                         return boards[i].mach_type;
 166
 167         return AR71XX_MACH_GENERIC;
 168 }
 169
 170 static int ar71xx_prom_init_myloader(void)
 171 {
 172         struct myloader_info *mylo;
 173
 174         mylo = myloader_get_info();
 175         if (!mylo)
 176                 return 0;
 177
 178         switch (mylo->did) {
 179         case DEVID_COMPEX_WP543:
 180                 ar71xx_mach = AR71XX_MACH_WP543;
 181                 break;
 182         default:
 183                 printk(KERN_WARNING "prom: unknown device id: %x\n",
 184                                 mylo->did);
 185         }
 186         ar71xx_set_mac_base(mylo->macs[0]);
 187
 188         return 1;
 189 }
 190
 191 static void ar71xx_prom_init_generic(void)
 192 {
 193         char *p;
 194
 195         ar71xx_prom_argc = fw_arg0;
 196         ar71xx_prom_argv = (char **)fw_arg1;
 197         ar71xx_prom_envp = (char **)fw_arg2;
 198
 199         p = ar71xx_prom_getargv("board");
 200         if (!p)
 201                 p = ar71xx_prom_getenv("board");
 202         if (p)
 203                 ar71xx_mach = find_board_byname(p);
 204
 205         p = ar71xx_prom_getenv("ethaddr");
 206         if (!p)
 207                 p = ar71xx_prom_getargv("kmac");
 208         if (p)
 209                 ar71xx_parse_mac_addr(p);
 210 }
 211
 212 void __init prom_init(void)
 213 {
 214         printk(KERN_DEBUG "prom: fw_arg0=%08x, fw_arg1=%08x, "
 215                         "fw_arg2=%08x, fw_arg3=%08x\n",
 216                         (unsigned int)fw_arg0, (unsigned int)fw_arg1,
 217                         (unsigned int)fw_arg2, (unsigned int)fw_arg3);
 218
 219         ar71xx_mach = AR71XX_MACH_GENERIC;
 220
 221         if (ar71xx_prom_init_myloader())
 222                 return;
 223
 224         ar71xx_prom_init_generic();
 225 }
 226
 227 void __init prom_free_prom_memory(void)
 228 {
 229         /* We do not have to prom memory to free */
 230 }
 231
 232 #define UART_READ(r) \
 233         __raw_readl((void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4 * (r)))
 234
 235 #define UART_WRITE(r, v) \
 236         __raw_writel((v), (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4*(r)))
 237
 238 void prom_putchar(unsigned char ch)
 239 {
 240         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
 241         UART_WRITE(UART_TX, ch);
 242         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
 243 }