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/*
* Ralink SoC specific prom routines
*
* Copyright (C) 2010 Joonas Lahtinen <joonas.lahtinen@gmail.com>
* Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/string.h>
#include <asm/bootinfo.h>
#include <asm/addrspace.h>
#include <asm/mach-ralink/common.h>
#include <asm/mach-ralink/machine.h>
unsigned long ramips_mem_base;
unsigned long ramips_mem_size_min;
unsigned long ramips_mem_size_max;
static inline void *to_ram_addr(void *addr)
{
u32 base;
base = KSEG0ADDR(ramips_mem_base);
if (((u32) addr > base) &&
((u32) addr < (base + ramips_mem_size_max)))
return addr;
base = KSEG1ADDR(ramips_mem_base);
if (((u32) addr > base) &&
((u32) addr < (base + ramips_mem_size_max)))
return addr;
/* some U-Boot variants uses physical addresses */
base = ramips_mem_base;
if (((u32) addr > base) &&
((u32) addr < (base + ramips_mem_size_max)))
return (void *)KSEG0ADDR(addr);
return NULL;
}
static char ramips_cmdline_buf[COMMAND_LINE_SIZE] __initdata;
static void __init prom_append_cmdline(const char *name,
const char *value)
{
snprintf(ramips_cmdline_buf, sizeof(ramips_cmdline_buf),
" %s=%s", name, value);
strlcat(arcs_cmdline, ramips_cmdline_buf, sizeof(arcs_cmdline));
}
#ifdef CONFIG_IMAGE_CMDLINE_HACK
extern char __image_cmdline[];
static int __init use_image_cmdline(void)
{
char *p = __image_cmdline;
int replace = 0;
if (*p == '-') {
replace = 1;
p++;
}
if (*p == '\0')
return 0;
if (replace) {
strlcpy(arcs_cmdline, p, sizeof(arcs_cmdline));
} else {
strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
}
return 1;
}
#else
static int inline use_image_cmdline(void) { return 0; }
#endif
static __init void prom_init_cmdline(int argc, char **argv)
{
int i;
if (use_image_cmdline())
return;
if (!argv) {
printk(KERN_DEBUG "argv=%p is invalid, skipping\n",
argv);
return;
}
for (i = 0; i < argc; i++) {
char *p = to_ram_addr(argv[i]);
if (!p) {
printk(KERN_DEBUG
"argv[%d]=%p is invalid, skipping\n",
i, argv[i]);
continue;
}
printk(KERN_DEBUG "argv[%d]: %s\n", i, p);
strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
}
}
static __init char *prom_append_env(char **env, const char *envname)
{
#define PROM_MAX_ENVS 256
int len = strlen(envname);
int i;
if (!env) {
printk(KERN_DEBUG "env=%p is not in RAM, skipping\n",
env);
return NULL;
}
for (i = 0; i < PROM_MAX_ENVS; i++) {
char *p = to_ram_addr(env[i]);
if (!p)
break;
printk(KERN_DEBUG "env[%d]: %s\n", i, p);
if (strncmp(envname, p, len) == 0 && p[len] == '=')
prom_append_cmdline(envname, p + len + 1);
}
return NULL;
#undef PROM_MAX_ENVS
}
void __init prom_init(void)
{
int argc;
char **envp;
char **argv;
ramips_soc_prom_init();
printk(KERN_DEBUG
"prom: fw_arg0=%08x, fw_arg1=%08x, fw_arg2=%08x, fw_arg3=%08x\n",
(unsigned int)fw_arg0, (unsigned int)fw_arg1,
(unsigned int)fw_arg2, (unsigned int)fw_arg3);
argc = fw_arg0;
argv = to_ram_addr((void *)fw_arg1);
prom_init_cmdline(argc, argv);
envp = to_ram_addr((void *)fw_arg2);
prom_append_env(envp, "board");
prom_append_env(envp, "ethaddr");
}
void __init prom_free_prom_memory(void)
{
/* We do not have to prom memory to free */
}
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