2 * Ralink SoC specific prom routines
4 * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/string.h>
15 #include <asm/bootinfo.h>
16 #include <asm/addrspace.h>
18 #include <asm/mach-ralink/common.h>
19 #include <asm/mach-ralink/machine.h>
20 #include <ralink_soc.h>
24 enum ramips_mach_type mach_type;
27 static struct board_rec boards[] __initdata = {
30 .mach_type = RAMIPS_MACH_RT_N15,
32 .name = "DIR-300-revB",
33 .mach_type = RAMIPS_MACH_DIR_300_REVB,
36 .mach_type = RAMIPS_MACH_V22RW_2X2,
39 .mach_type = RAMIPS_MACH_WHR_G300N,
42 .mach_type = RAMIPS_MACH_FONERA20N,
46 static inline void *to_ram_addr(void *addr)
50 base = KSEG0ADDR(RALINK_SOC_SDRAM_BASE);
51 if (((u32) addr > base) &&
52 ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
55 base = KSEG1ADDR(RALINK_SOC_SDRAM_BASE);
56 if (((u32) addr > base) &&
57 ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
60 /* some U-Boot variants uses physical addresses */
61 base = RALINK_SOC_SDRAM_BASE;
62 if (((u32) addr > base) &&
63 ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
64 return (void *)KSEG0ADDR(addr);
69 static void __init prom_append_cmdline(const char *name,
74 snprintf(buf, sizeof(buf), " %s=%s", name, value);
75 strlcat(arcs_cmdline, buf, sizeof(arcs_cmdline));
78 #ifdef CONFIG_IMAGE_CMDLINE_HACK
79 extern char __image_cmdline[];
81 static int __init use_image_cmdline(void)
83 char *p = __image_cmdline;
95 strlcpy(arcs_cmdline, p, sizeof(arcs_cmdline));
97 strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
98 strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
104 static int inline use_image_cmdline(void) { return 0; }
107 static __init void prom_init_cmdline(int argc, char **argv)
111 if (use_image_cmdline())
115 printk(KERN_DEBUG "argv=%p is invalid, skipping\n",
120 for (i = 0; i < argc; i++) {
121 char *p = to_ram_addr(argv[i]);
125 "argv[%d]=%p is invalid, skipping\n",
130 printk(KERN_DEBUG "argv[%d]: %s\n", i, p);
131 strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
132 strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
136 static __init char *prom_append_env(char **env, const char *envname)
138 #define PROM_MAX_ENVS 256
139 int len = strlen(envname);
143 printk(KERN_DEBUG "env=%p is not in RAM, skipping\n",
148 for (i = 0; i < PROM_MAX_ENVS; i++) {
149 char *p = to_ram_addr(env[i]);
154 printk(KERN_DEBUG "env[%d]: %s\n", i, p);
155 if (strncmp(envname, p, len) == 0 && p[len] == '=')
156 prom_append_cmdline(envname, p + len + 1);
163 static __init int ramips_board_setup(char *name)
167 for (i = 0; i < ARRAY_SIZE(boards); i++)
168 if (strcmp(name, boards[i].name) == 0) {
169 ramips_mach = boards[i].mach_type;
175 __setup("board=", ramips_board_setup);
177 void __init prom_init(void)
184 "prom: fw_arg0=%08x, fw_arg1=%08x, fw_arg2=%08x, fw_arg3=%08x\n",
185 (unsigned int)fw_arg0, (unsigned int)fw_arg1,
186 (unsigned int)fw_arg2, (unsigned int)fw_arg3);
189 argv = to_ram_addr((void *)fw_arg1);
190 prom_init_cmdline(argc, argv);
192 envp = to_ram_addr((void *)fw_arg2);
193 prom_append_env(envp, "board");
194 prom_append_env(envp, "ethaddr");
197 void __init prom_free_prom_memory(void)
199 /* We do not have to prom memory to free */