| 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 | |
| 22 | unsigned long ramips_mem_base; |
| 23 | unsigned long ramips_mem_size_min; |
| 24 | unsigned long ramips_mem_size_max; |
| 25 | |
| 26 | static inline void *to_ram_addr(void *addr) |
| 27 | { |
| 28 | u32 base; |
| 29 | |
| 30 | base = KSEG0ADDR(ramips_mem_base); |
| 31 | if (((u32) addr > base) && |
| 32 | ((u32) addr < (base + ramips_mem_size_max))) |
| 33 | return addr; |
| 34 | |
| 35 | base = KSEG1ADDR(ramips_mem_base); |
| 36 | if (((u32) addr > base) && |
| 37 | ((u32) addr < (base + ramips_mem_size_max))) |
| 38 | return addr; |
| 39 | |
| 40 | /* some U-Boot variants uses physical addresses */ |
| 41 | base = ramips_mem_base; |
| 42 | if (((u32) addr > base) && |
| 43 | ((u32) addr < (base + ramips_mem_size_max))) |
| 44 | return (void *)KSEG0ADDR(addr); |
| 45 | |
| 46 | return NULL; |
| 47 | } |
| 48 | |
| 49 | static char ramips_cmdline_buf[COMMAND_LINE_SIZE] __initdata; |
| 50 | static void __init prom_append_cmdline(const char *name, |
| 51 | const char *value) |
| 52 | { |
| 53 | snprintf(ramips_cmdline_buf, sizeof(ramips_cmdline_buf), |
| 54 | " %s=%s", name, value); |
| 55 | strlcat(arcs_cmdline, ramips_cmdline_buf, sizeof(arcs_cmdline)); |
| 56 | } |
| 57 | |
| 58 | #ifdef CONFIG_IMAGE_CMDLINE_HACK |
| 59 | extern char __image_cmdline[]; |
| 60 | |
| 61 | static int __init use_image_cmdline(void) |
| 62 | { |
| 63 | char *p = __image_cmdline; |
| 64 | int replace = 0; |
| 65 | |
| 66 | if (*p == '-') { |
| 67 | replace = 1; |
| 68 | p++; |
| 69 | } |
| 70 | |
| 71 | if (*p == '\0') |
| 72 | return 0; |
| 73 | |
| 74 | if (replace) { |
| 75 | strlcpy(arcs_cmdline, p, sizeof(arcs_cmdline)); |
| 76 | } else { |
| 77 | strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline)); |
| 78 | strlcat(arcs_cmdline, p, sizeof(arcs_cmdline)); |
| 79 | } |
| 80 | |
| 81 | return 1; |
| 82 | } |
| 83 | #else |
| 84 | static int inline use_image_cmdline(void) { return 0; } |
| 85 | #endif |
| 86 | |
| 87 | static __init void prom_init_cmdline(int argc, char **argv) |
| 88 | { |
| 89 | int i; |
| 90 | |
| 91 | if (use_image_cmdline()) |
| 92 | return; |
| 93 | |
| 94 | if (!argv) { |
| 95 | printk(KERN_DEBUG "argv=%p is invalid, skipping\n", |
| 96 | argv); |
| 97 | return; |
| 98 | } |
| 99 | |
| 100 | for (i = 0; i < argc; i++) { |
| 101 | char *p = to_ram_addr(argv[i]); |
| 102 | |
| 103 | if (!p) { |
| 104 | printk(KERN_DEBUG |
| 105 | "argv[%d]=%p is invalid, skipping\n", |
| 106 | i, argv[i]); |
| 107 | continue; |
| 108 | } |
| 109 | |
| 110 | printk(KERN_DEBUG "argv[%d]: %s\n", i, p); |
| 111 | strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline)); |
| 112 | strlcat(arcs_cmdline, p, sizeof(arcs_cmdline)); |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | static __init char *prom_append_env(char **env, const char *envname) |
| 117 | { |
| 118 | #define PROM_MAX_ENVS 256 |
| 119 | int len = strlen(envname); |
| 120 | int i; |
| 121 | |
| 122 | if (!env) { |
| 123 | printk(KERN_DEBUG "env=%p is not in RAM, skipping\n", |
| 124 | env); |
| 125 | return NULL; |
| 126 | } |
| 127 | |
| 128 | for (i = 0; i < PROM_MAX_ENVS; i++) { |
| 129 | char *p = to_ram_addr(env[i]); |
| 130 | |
| 131 | if (!p) |
| 132 | break; |
| 133 | |
| 134 | printk(KERN_DEBUG "env[%d]: %s\n", i, p); |
| 135 | if (strncmp(envname, p, len) == 0 && p[len] == '=') |
| 136 | prom_append_cmdline(envname, p + len + 1); |
| 137 | } |
| 138 | |
| 139 | return NULL; |
| 140 | #undef PROM_MAX_ENVS |
| 141 | } |
| 142 | |
| 143 | void __init prom_init(void) |
| 144 | { |
| 145 | int argc; |
| 146 | char **envp; |
| 147 | char **argv; |
| 148 | |
| 149 | ramips_soc_prom_init(); |
| 150 | |
| 151 | printk(KERN_DEBUG |
| 152 | "prom: fw_arg0=%08x, fw_arg1=%08x, fw_arg2=%08x, fw_arg3=%08x\n", |
| 153 | (unsigned int)fw_arg0, (unsigned int)fw_arg1, |
| 154 | (unsigned int)fw_arg2, (unsigned int)fw_arg3); |
| 155 | |
| 156 | argc = fw_arg0; |
| 157 | argv = to_ram_addr((void *)fw_arg1); |
| 158 | prom_init_cmdline(argc, argv); |
| 159 | |
| 160 | envp = to_ram_addr((void *)fw_arg2); |
| 161 | prom_append_env(envp, "board"); |
| 162 | prom_append_env(envp, "ethaddr"); |
| 163 | } |
| 164 | |
| 165 | void __init prom_free_prom_memory(void) |
| 166 | { |
| 167 | /* We do not have to prom memory to free */ |
| 168 | } |
| 169 | |
