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 int ramips_prom_argc __initdata;
28 static char **ramips_prom_argv __initdata;
29 static char **ramips_prom_envp __initdata;
31 static struct board_rec boards[] __initdata = {
34 .mach_type = RAMIPS_MACH_RT_N15,
36 .name = "DIR-300-revB",
37 .mach_type = RAMIPS_MACH_DIR_300_REVB,
40 .mach_type = RAMIPS_MACH_V22RW_2X2,
43 .mach_type = RAMIPS_MACH_WHR_G300N,
46 .mach_type = RAMIPS_MACH_FONERA20N,
50 static inline void *to_ram_addr(void *addr)
54 base = KSEG0ADDR(RALINK_SOC_SDRAM_BASE);
55 if (((u32) addr > base) &&
56 ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
59 base = KSEG1ADDR(RALINK_SOC_SDRAM_BASE);
60 if (((u32) addr > base) &&
61 ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
64 /* some U-Boot variants uses physical addresses */
65 base = RALINK_SOC_SDRAM_BASE;
66 if (((u32) addr > base) &&
67 ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
68 return (void *)KSEG0ADDR(addr);
73 static __init char *ramips_prom_getargv(const char *name)
75 int len = strlen(name);
78 if (!ramips_prom_argv) {
79 printk(KERN_DEBUG "argv=%p is invalid, skipping\n",
84 for (i = 0; i < ramips_prom_argc; i++) {
85 char *argv = to_ram_addr(ramips_prom_argv[i]);
89 "argv[%d]=%p is invalid, skipping\n",
90 i, ramips_prom_argv[i]);
94 printk(KERN_DEBUG "argv[%d]: %s\n", i, argv);
95 if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
96 return argv + len + 1;
102 static __init char *ramips_prom_getenv(const char *envname)
104 #define PROM_MAX_ENVS 256
105 int len = strlen(envname);
109 env = ramips_prom_envp;
111 printk(KERN_DEBUG "envp=%p is not in RAM, skipping\n",
116 for (i = 0; i < PROM_MAX_ENVS; i++) {
117 char *p = to_ram_addr(env[i]);
122 printk(KERN_DEBUG "env[%d]: %s\n", i, p);
123 if (strncmp(envname, p, len) == 0 && p[len] == '=')
131 static __init void find_board_byname(char *name)
135 for (i = 0; i < ARRAY_SIZE(boards); i++)
136 if (strcmp(name, boards[i].name) == 0) {
137 ramips_mach = boards[i].mach_type;
142 void __init prom_init(void)
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);
151 ramips_prom_argc = fw_arg0;
152 ramips_prom_argv = to_ram_addr((void *)fw_arg1);
153 ramips_prom_envp = to_ram_addr((void *)fw_arg2);
155 p = ramips_prom_getargv("board");
157 p = ramips_prom_getenv("board");
159 find_board_byname(p);
162 void __init prom_free_prom_memory(void)
164 /* We do not have to prom memory to free */