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      = MACH_AR71XX_RB_411,
  37         }, {
  38                 .name           = "433",
  39                 .mach_type      = MACH_AR71XX_RB_433,
  40         }, {
  41                 .name           = "450",
  42                 .mach_type      = MACH_AR71XX_RB_450,
  43         }
  44 };
  45
  46 static __init char *ar71xx_prom_getargv(const char *name)
  47 {
  48         int len = strlen(name);
  49         int i;
  50
  51         if (!ar71xx_prom_argv)
  52                 return NULL;
  53
  54         for (i = 0; i < ar71xx_prom_argc; i++) {
  55                 char *argv = ar71xx_prom_argv[i];
  56                 if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
  57                         return argv + len + 1;
  58         }
  59
  60         return NULL;
  61 }
  62
  63 static __init char *ar71xx_prom_getenv(const char *envname)
  64 {
  65         int len = strlen(envname);
  66         char **env;
  67
  68         if (!ar71xx_prom_envp)
  69                 return NULL;
  70
  71         for (env = ar71xx_prom_envp; *env != NULL; env++)
  72                 if (strncmp(envname, *env, len) == 0 && (*env)[len] == '=')
  73                         return *env + len + 1;
  74
  75         return NULL;
  76 }
  77
  78 static __init unsigned long find_board_byname(char *name)
  79 {
  80         int i;
  81
  82         for (i = 0; i < ARRAY_SIZE(boards); i++)
  83                 if (strcmp(name, boards[i].name) == 0)
  84                         return boards[i].mach_type;
  85
  86         return MACH_AR71XX_GENERIC;
  87 }
  88
  89 static int ar71xx_prom_init_myloader(void)
  90 {
  91         struct myloader_info *mylo;
  92
  93         mylo = myloader_get_info();
  94         if (!mylo)
  95                 return 0;
  96
  97         switch (mylo->did) {
  98         case DEVID_COMPEX_WP543:
  99                 mips_machtype = MACH_AR71XX_WP543;
 100                 break;
 101         default:
 102                 printk(KERN_WARNING "prom: unknown device id: %x\n",
 103                                 mylo->did);
 104         }
 105         ar71xx_set_mac_base(mylo->macs[0]);
 106
 107         return 1;
 108 }
 109
 110 static void ar71xx_prom_init_generic(void)
 111 {
 112         char *p;
 113
 114         ar71xx_prom_argc = fw_arg0;
 115         ar71xx_prom_argv = (char **)fw_arg1;
 116         ar71xx_prom_envp = (char **)fw_arg2;
 117
 118         p = ar71xx_prom_getenv("board");
 119         if (!p)
 120                 p = ar71xx_prom_getargv("board");
 121         if (p)
 122                 mips_machtype = find_board_byname(p);
 123
 124         p = ar71xx_prom_getenv("ethaddr");
 125         if (!p)
 126                 p = ar71xx_prom_getargv("kmac");
 127         if (p)
 128                 ar71xx_parse_mac_addr(p);
 129 }
 130
 131 void __init prom_init(void)
 132 {
 133         printk(KERN_DEBUG "prom: fw_arg0=%08x, fw_arg1=%08x, "
 134                         "fw_arg2=%08x, fw_arg3=%08x\n",
 135                         (unsigned int)fw_arg0, (unsigned int)fw_arg1,
 136                         (unsigned int)fw_arg2, (unsigned int)fw_arg3);
 137
 138         mips_machtype = MACH_AR71XX_GENERIC;
 139
 140         if (ar71xx_prom_init_myloader())
 141                 return;
 142
 143         ar71xx_prom_init_generic();
 144 }
 145
 146 void __init prom_free_prom_memory(void)
 147 {
 148         /* We do not have to prom memory to free */
 149 }
 150
 151 #define UART_READ(r) \
 152         __raw_readl((void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4 * (r)))
 153
 154 #define UART_WRITE(r, v) \
 155         __raw_writel((v), (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4*(r)))
 156
 157 void prom_putchar(unsigned char ch)
 158 {
 159         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
 160         UART_WRITE(UART_TX, ch);
 161         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
 162 }