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                 .name           = "493",
  45                 .mach_type      = MACH_AR71XX_RB_493,
  46         }, {
  47                 .name           = "AW-NR580",
  48                 .mach_type      = MACH_AR71XX_AW_NR580,
  49         }
  50 };
  51
  52 static __init char *ar71xx_prom_getargv(const char *name)
  53 {
  54         int len = strlen(name);
  55         int i;
  56
  57         if (!ar71xx_prom_argv)
  58                 return NULL;
  59
  60         for (i = 0; i < ar71xx_prom_argc; i++) {
  61                 char *argv = ar71xx_prom_argv[i];
  62                 if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
  63                         return argv + len + 1;
  64         }
  65
  66         return NULL;
  67 }
  68
  69 static __init char *ar71xx_prom_getenv(const char *envname)
  70 {
  71         int len = strlen(envname);
  72         char **env;
  73
  74         if (!ar71xx_prom_envp)
  75                 return NULL;
  76
  77         for (env = ar71xx_prom_envp; *env != NULL; env++)
  78                 if (strncmp(envname, *env, len) == 0 && (*env)[len] == '=')
  79                         return *env + len + 1;
  80
  81         return NULL;
  82 }
  83
  84 static __init unsigned long find_board_byname(char *name)
  85 {
  86         int i;
  87
  88         for (i = 0; i < ARRAY_SIZE(boards); i++)
  89                 if (strcmp(name, boards[i].name) == 0)
  90                         return boards[i].mach_type;
  91
  92         return MACH_AR71XX_GENERIC;
  93 }
  94
  95 static int ar71xx_prom_init_myloader(void)
  96 {
  97         struct myloader_info *mylo;
  98
  99         mylo = myloader_get_info();
 100         if (!mylo)
 101                 return 0;
 102
 103         switch (mylo->did) {
 104         case DEVID_COMPEX_WP543:
 105                 mips_machtype = MACH_AR71XX_WP543;
 106                 break;
 107         default:
 108                 printk(KERN_WARNING "prom: unknown device id: %x\n",
 109                                 mylo->did);
 110         }
 111         ar71xx_set_mac_base(mylo->macs[0]);
 112
 113         return 1;
 114 }
 115
 116 static void ar71xx_prom_init_generic(void)
 117 {
 118         char *p;
 119
 120         ar71xx_prom_argc = fw_arg0;
 121         ar71xx_prom_argv = (char **)fw_arg1;
 122         ar71xx_prom_envp = (char **)fw_arg2;
 123
 124         p = ar71xx_prom_getenv("board");
 125         if (!p)
 126                 p = ar71xx_prom_getargv("board");
 127         if (p)
 128                 mips_machtype = find_board_byname(p);
 129
 130         p = ar71xx_prom_getenv("ethaddr");
 131         if (!p)
 132                 p = ar71xx_prom_getargv("kmac");
 133         if (p)
 134                 ar71xx_parse_mac_addr(p);
 135 }
 136
 137 void __init prom_init(void)
 138 {
 139         printk(KERN_DEBUG "prom: fw_arg0=%08x, fw_arg1=%08x, "
 140                         "fw_arg2=%08x, fw_arg3=%08x\n",
 141                         (unsigned int)fw_arg0, (unsigned int)fw_arg1,
 142                         (unsigned int)fw_arg2, (unsigned int)fw_arg3);
 143
 144         mips_machtype = MACH_AR71XX_GENERIC;
 145
 146         if (ar71xx_prom_init_myloader())
 147                 return;
 148
 149         ar71xx_prom_init_generic();
 150 }
 151
 152 void __init prom_free_prom_memory(void)
 153 {
 154         /* We do not have to prom memory to free */
 155 }
 156
 157 #define UART_READ(r) \
 158         __raw_readl((void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4 * (r)))
 159
 160 #define UART_WRITE(r, v) \
 161         __raw_writel((v), (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4*(r)))
 162
 163 void prom_putchar(unsigned char ch)
 164 {
 165         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
 166         UART_WRITE(UART_TX, ch);
 167         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
 168 }