target/linux/ramips/files/arch/mips/ralink/common/prom.c

   1 /*
   2  *  Ralink SoC specific prom routines
   3  *
   4  *  Copyright (C) 2010 Joonas Lahtinen <joonas.lahtinen@gmail.com>
   5  *  Copyright (C) 2009 Gabor Juhos <juhosg@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/string.h>
  15
  16 #include <asm/bootinfo.h>
  17 #include <asm/addrspace.h>
  18
  19 #include <asm/mach-ralink/common.h>
  20 #include <asm/mach-ralink/machine.h>
  21 #include <ralink_soc.h>
  22
  23 static inline void *to_ram_addr(void *addr)
  24 {
  25         u32 base;
  26
  27         base = KSEG0ADDR(RALINK_SOC_SDRAM_BASE);
  28         if (((u32) addr > base) &&
  29             ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
  30                 return addr;
  31
  32         base = KSEG1ADDR(RALINK_SOC_SDRAM_BASE);
  33         if (((u32) addr > base) &&
  34             ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
  35                 return addr;
  36
  37         /* some U-Boot variants uses physical addresses */
  38         base = RALINK_SOC_SDRAM_BASE;
  39         if (((u32) addr > base) &&
  40             ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
  41                 return (void *)KSEG0ADDR(addr);
  42
  43         return NULL;
  44 }
  45
  46 static void __init prom_append_cmdline(const char *name,
  47                                        const char *value)
  48 {
  49         char buf[CL_SIZE];
  50
  51         snprintf(buf, sizeof(buf), " %s=%s", name, value);
  52         strlcat(arcs_cmdline, buf, sizeof(arcs_cmdline));
  53 }
  54
  55 #ifdef CONFIG_IMAGE_CMDLINE_HACK
  56 extern char __image_cmdline[];
  57
  58 static int __init use_image_cmdline(void)
  59 {
  60         char *p = __image_cmdline;
  61         int replace = 0;
  62
  63         if (*p == '-') {
  64                 replace = 1;
  65                 p++;
  66         }
  67
  68         if (*p == '\0')
  69                 return 0;
  70
  71         if (replace) {
  72                 strlcpy(arcs_cmdline, p, sizeof(arcs_cmdline));
  73         } else {
  74                 strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
  75                 strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
  76         }
  77
  78         return 1;
  79 }
  80 #else
  81 static int inline use_image_cmdline(void) { return 0; }
  82 #endif
  83
  84 static __init void prom_init_cmdline(int argc, char **argv)
  85 {
  86         int i;
  87
  88         if (use_image_cmdline())
  89                 return;
  90
  91         if (!argv) {
  92                 printk(KERN_DEBUG "argv=%p is invalid, skipping\n",
  93                        argv);
  94                 return;
  95         }
  96
  97         for (i = 0; i < argc; i++) {
  98                 char *p = to_ram_addr(argv[i]);
  99
 100                 if (!p) {
 101                         printk(KERN_DEBUG
 102                                "argv[%d]=%p is invalid, skipping\n",
 103                                i, argv[i]);
 104                         continue;
 105                 }
 106
 107                 printk(KERN_DEBUG "argv[%d]: %s\n", i, p);
 108                 strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
 109                 strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
 110         }
 111 }
 112
 113 static __init char *prom_append_env(char **env, const char *envname)
 114 {
 115 #define PROM_MAX_ENVS   256
 116         int len = strlen(envname);
 117         int i;
 118
 119         if (!env) {
 120                 printk(KERN_DEBUG "env=%p is not in RAM, skipping\n",
 121                        env);
 122                 return NULL;
 123         }
 124
 125         for (i = 0; i < PROM_MAX_ENVS; i++) {
 126                 char *p = to_ram_addr(env[i]);
 127
 128                 if (!p)
 129                         break;
 130
 131                 printk(KERN_DEBUG "env[%d]: %s\n", i, p);
 132                 if (strncmp(envname, p, len) == 0 && p[len] == '=')
 133                         prom_append_cmdline(envname, p + len + 1);
 134         }
 135
 136         return NULL;
 137 #undef PROM_MAX_ENVS
 138 }
 139
 140 void __init prom_init(void)
 141 {
 142         int argc;
 143         char **envp;
 144         char **argv;
 145
 146         printk(KERN_DEBUG
 147                "prom: fw_arg0=%08x, fw_arg1=%08x, fw_arg2=%08x, fw_arg3=%08x\n",
 148                (unsigned int)fw_arg0, (unsigned int)fw_arg1,
 149                (unsigned int)fw_arg2, (unsigned int)fw_arg3);
 150
 151         argc = fw_arg0;
 152         argv = to_ram_addr((void *)fw_arg1);
 153         prom_init_cmdline(argc, argv);
 154
 155         envp = to_ram_addr((void *)fw_arg2);
 156         prom_append_env(envp, "board");
 157         prom_append_env(envp, "ethaddr");
 158 }
 159
 160 void __init prom_free_prom_memory(void)
 161 {
 162         /* We do not have to prom memory to free */
 163 }