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>
22 unsigned long ramips_mem_base;
23 unsigned long ramips_mem_size_min;
24 unsigned long ramips_mem_size_max;
26 static inline void *to_ram_addr(void *addr)
30 base = KSEG0ADDR(ramips_mem_base);
31 if (((u32) addr > base) &&
32 ((u32) addr < (base + ramips_mem_size_max)))
35 base = KSEG1ADDR(ramips_mem_base);
36 if (((u32) addr > base) &&
37 ((u32) addr < (base + ramips_mem_size_max)))
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);
49 static char ramips_cmdline_buf[COMMAND_LINE_SIZE] __initdata;
50 static void __init prom_append_cmdline(const char *name,
53 snprintf(ramips_cmdline_buf, sizeof(ramips_cmdline_buf),
54 " %s=%s", name, value);
55 strlcat(arcs_cmdline, ramips_cmdline_buf, sizeof(arcs_cmdline));
58 #ifdef CONFIG_IMAGE_CMDLINE_HACK
59 extern char __image_cmdline[];
61 static int __init use_image_cmdline(void)
63 char *p = __image_cmdline;
75 strlcpy(arcs_cmdline, p, sizeof(arcs_cmdline));
77 strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
78 strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
84 static int inline use_image_cmdline(void) { return 0; }
87 static __init void prom_init_cmdline(int argc, char **argv)
91 if (use_image_cmdline())
95 printk(KERN_DEBUG "argv=%p is invalid, skipping\n",
100 for (i = 0; i < argc; i++) {
101 char *p = to_ram_addr(argv[i]);
105 "argv[%d]=%p is invalid, skipping\n",
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));
116 static __init char *prom_append_env(char **env, const char *envname)
118 #define PROM_MAX_ENVS 256
119 int len = strlen(envname);
123 printk(KERN_DEBUG "env=%p is not in RAM, skipping\n",
128 for (i = 0; i < PROM_MAX_ENVS; i++) {
129 char *p = to_ram_addr(env[i]);
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);
143 void __init prom_init(void)
149 ramips_soc_prom_init();
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);
157 argv = to_ram_addr((void *)fw_arg1);
158 prom_init_cmdline(argc, argv);
160 envp = to_ram_addr((void *)fw_arg2);
161 prom_append_env(envp, "board");
162 prom_append_env(envp, "ethaddr");
165 void __init prom_free_prom_memory(void)
167 /* We do not have to prom memory to free */