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