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,
37 .mach_type = RAMIPS_MACH_V22RW_2X2,
40 .mach_type = RAMIPS_MACH_WHR_G300N,
44 static inline void *to_ram_addr(void *addr)
48 base = KSEG0ADDR(RALINK_SOC_SDRAM_BASE);
49 if (((u32) addr > base) &&
50 ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
53 base = KSEG1ADDR(RALINK_SOC_SDRAM_BASE);
54 if (((u32) addr > base) &&
55 ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
58 /* some U-Boot variants uses physical addresses */
59 base = RALINK_SOC_SDRAM_BASE;
60 if (((u32) addr > base) &&
61 ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
62 return (void *)KSEG0ADDR(addr);
67 static __init char *ramips_prom_getargv(const char *name)
69 int len = strlen(name);
72 if (!ramips_prom_argv) {
73 printk(KERN_DEBUG "argv=%p is invalid, skipping\n",
78 for (i = 0; i < ramips_prom_argc; i++) {
79 char *argv = to_ram_addr(ramips_prom_argv[i]);
83 "argv[%d]=%p is invalid, skipping\n",
84 i, ramips_prom_argv[i]);
88 printk(KERN_DEBUG "argv[%d]: %s\n", i, argv);
89 if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
90 return argv + len + 1;
96 static __init char *ramips_prom_getenv(const char *envname)
98 #define PROM_MAX_ENVS 256
99 int len = strlen(envname);
103 env = ramips_prom_envp;
105 printk(KERN_DEBUG "envp=%p is not in RAM, skipping\n",
110 for (i = 0; i < PROM_MAX_ENVS; i++) {
111 char *p = to_ram_addr(env[i]);
116 printk(KERN_DEBUG "env[%d]: %s\n", i, p);
117 if (strncmp(envname, p, len) == 0 && p[len] == '=')
125 static __init void find_board_byname(char *name)
129 for (i = 0; i < ARRAY_SIZE(boards); i++)
130 if (strcmp(name, boards[i].name) == 0) {
131 ramips_mach = boards[i].mach_type;
136 void __init prom_init(void)
141 "prom: fw_arg0=%08x, fw_arg1=%08x, fw_arg2=%08x, fw_arg3=%08x\n",
142 (unsigned int)fw_arg0, (unsigned int)fw_arg1,
143 (unsigned int)fw_arg2, (unsigned int)fw_arg3);
145 ramips_prom_argc = fw_arg0;
146 ramips_prom_argv = to_ram_addr((void *)fw_arg1);
147 ramips_prom_envp = to_ram_addr((void *)fw_arg2);
149 p = ramips_prom_getargv("board");
151 p = ramips_prom_getenv("board");
153 find_board_byname(p);
156 void __init prom_free_prom_memory(void)
158 /* We do not have to prom memory to free */