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
  20 #include <asm/mach-ar71xx/ar71xx.h>
  21 #include <asm/mach-ar71xx/platform.h>
  22
  23 struct board_rec {
  24         char            *name;
  25         unsigned long   mach_type;
  26 };
  27
  28 static int ar71xx_prom_argc __initdata;
  29 static char **ar71xx_prom_argv __initdata;
  30 static char **ar71xx_prom_envp __initdata;
  31
  32 static struct board_rec boards[] __initdata = {
  33         {
  34                 .name           = "411",
  35                 .mach_type      = MACH_AR71XX_RB_411,
  36         }, {
  37                 .name           = "433",
  38                 .mach_type      = MACH_AR71XX_RB_433,
  39         }, {
  40                 .name           = "450",
  41                 .mach_type      = MACH_AR71XX_RB_450,
  42         }
  43 };
  44
  45 static __init void routerboot_printargs(void)
  46 {
  47         int i;
  48
  49         for (i = 0; i < ar71xx_prom_argc; i++)
  50                 printk(KERN_DEBUG "prom: routerboot envp[%d]: %s\n",
  51                                 i, ar71xx_prom_argv[i]);
  52 }
  53
  54 static __init char *routerboot_getenv(const char *envname)
  55 {
  56         int len = strlen(envname);
  57         int i;
  58
  59         for (i = 0; i < ar71xx_prom_argc; i++) {
  60                 char *env = ar71xx_prom_argv[i];
  61                 if (strncmp(envname, env, len) == 0 && (env)[len] == '=')
  62                         return env + len + 1;
  63         }
  64
  65         return NULL;
  66 }
  67
  68 static __init char *redboot_getenv(const char *envname)
  69 {
  70         int len = strlen(envname);
  71         char **env;
  72
  73         for (env = ar71xx_prom_envp; *env != NULL; env++)
  74                 if (strncmp(envname, *env, len) == 0 && (*env)[len] == '=')
  75                         return *env + len + 1;
  76
  77         return NULL;
  78 }
  79
  80 static __init unsigned long find_board_byname(char *name)
  81 {
  82         int i;
  83
  84         for (i = 0; i < ARRAY_SIZE(boards); i++)
  85                 if (strcmp(name, boards[i].name) == 0)
  86                         return boards[i].mach_type;
  87
  88         return MACH_AR71XX_GENERIC;
  89 }
  90
  91 void __init prom_init(void)
  92 {
  93         char *board = NULL;
  94         char *mac = NULL;
  95
  96         printk(KERN_DEBUG "prom: fw_arg0=%08x, fw_arg1=%08x, "
  97                         "fw_arg2=%08x, fw_arg3=%08x\n",
  98                         (unsigned int)fw_arg0, (unsigned int)fw_arg1,
  99                         (unsigned int)fw_arg2, (unsigned int)fw_arg3);
 100
 101         if ((fw_arg0 == 7) && (fw_arg2 == 0) && (fw_arg3 == 0)) {
 102                  /* assume RouterBOOT */
 103                 ar71xx_prom_argc = fw_arg0;
 104                 ar71xx_prom_argv = (char **)fw_arg1;
 105                 routerboot_printargs();
 106                 board = routerboot_getenv("board");
 107                 mac = routerboot_getenv("kmac");
 108         } else {
 109                 /* assume Redboot */
 110                 ar71xx_prom_argc = fw_arg0;
 111                 ar71xx_prom_argv = (char **)fw_arg1;
 112                 ar71xx_prom_envp = (char **)fw_arg2;
 113                 mac = redboot_getenv("ethaddr");
 114         }
 115
 116         if (board)
 117                 mips_machtype = find_board_byname(board);
 118         else
 119                 mips_machtype = MACH_AR71XX_GENERIC;
 120
 121         if (mac)
 122                 ar71xx_set_mac_base(mac);
 123
 124         ar71xx_print_cmdline();
 125 }
 126
 127 void __init prom_free_prom_memory(void)
 128 {
 129         /* We do not have to prom memory to free */
 130 }
 131
 132 #define UART_READ(r) \
 133         __raw_readl((void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4 * (r)))
 134
 135 #define UART_WRITE(r, v) \
 136         __raw_writel((v), (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4*(r)))
 137
 138 void prom_putchar(unsigned char ch)
 139 {
 140         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
 141         UART_WRITE(UART_TX, ch);
 142         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
 143 }