2 * Ralink SoC specific prom routines
4 * Copyright (C) 2010 Joonas Lahtinen <joonas.lahtinen@gmail.com>
5 * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
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.
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/string.h>
16 #include <asm/bootinfo.h>
17 #include <asm/addrspace.h>
19 #include <asm/mach-ralink/common.h>
20 #include <asm/mach-ralink/machine.h>
21 #include <ralink_soc.h>
25 enum ramips_mach_type mach_type;
28 static struct board_rec boards[] __initdata = {
31 .mach_type = RAMIPS_MACH_RT_N15,
33 .name = "WZR-AGL300NH",
34 .mach_type = RAMIPS_MACH_WZR_AGL300NH,
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 void __init prom_append_cmdline(const char *name,
78 snprintf(buf, sizeof(buf), " %s=%s", name, value);
79 strlcat(arcs_cmdline, buf, sizeof(arcs_cmdline));
82 #ifdef CONFIG_IMAGE_CMDLINE_HACK
83 extern char __image_cmdline[];
85 static int __init use_image_cmdline(void)
87 char *p = __image_cmdline;
99 strlcpy(arcs_cmdline, p, sizeof(arcs_cmdline));
101 strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
102 strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
108 static int inline use_image_cmdline(void) { return 0; }
111 static __init void prom_init_cmdline(int argc, char **argv)
115 if (use_image_cmdline())
119 printk(KERN_DEBUG "argv=%p is invalid, skipping\n",
124 for (i = 0; i < argc; i++) {
125 char *p = to_ram_addr(argv[i]);
129 "argv[%d]=%p is invalid, skipping\n",
134 printk(KERN_DEBUG "argv[%d]: %s\n", i, p);
135 strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
136 strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
140 static __init char *prom_append_env(char **env, const char *envname)
142 #define PROM_MAX_ENVS 256
143 int len = strlen(envname);
147 printk(KERN_DEBUG "env=%p is not in RAM, skipping\n",
152 for (i = 0; i < PROM_MAX_ENVS; i++) {
153 char *p = to_ram_addr(env[i]);
158 printk(KERN_DEBUG "env[%d]: %s\n", i, p);
159 if (strncmp(envname, p, len) == 0 && p[len] == '=')
160 prom_append_cmdline(envname, p + len + 1);
167 static __init int ramips_board_setup(char *name)
171 for (i = 0; i < ARRAY_SIZE(boards); i++)
172 if (strcmp(name, boards[i].name) == 0) {
173 ramips_mach = boards[i].mach_type;
179 __setup("board=", ramips_board_setup);
181 void __init prom_init(void)
188 "prom: fw_arg0=%08x, fw_arg1=%08x, fw_arg2=%08x, fw_arg3=%08x\n",
189 (unsigned int)fw_arg0, (unsigned int)fw_arg1,
190 (unsigned int)fw_arg2, (unsigned int)fw_arg3);
193 argv = to_ram_addr((void *)fw_arg1);
194 prom_init_cmdline(argc, argv);
196 envp = to_ram_addr((void *)fw_arg2);
197 prom_append_env(envp, "board");
198 prom_append_env(envp, "ethaddr");
201 void __init prom_free_prom_memory(void)
203 /* We do not have to prom memory to free */