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/*
* Ralink SoC specific prom routines
*
* 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>
#include <ralink_soc.h>
struct board_rec {
char *name;
enum ramips_mach_type mach_type;
};
static int ramips_prom_argc __initdata;
static char **ramips_prom_argv __initdata;
static char **ramips_prom_envp __initdata;
static struct board_rec boards[] __initdata = {
{
.name = "RT-N15",
.mach_type = RAMIPS_MACH_RT_N15,
}, {
.name = "DIR-300-revB",
.mach_type = RAMIPS_MACH_DIR_300_REVB,
}, {
.name = "V22RW-2X2",
.mach_type = RAMIPS_MACH_V22RW_2X2,
}, {
.name = "WHR-G300N",
.mach_type = RAMIPS_MACH_WHR_G300N,
}
};
static inline void *to_ram_addr(void *addr)
{
u32 base;
base = KSEG0ADDR(RALINK_SOC_SDRAM_BASE);
if (((u32) addr > base) &&
((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
return addr;
base = KSEG1ADDR(RALINK_SOC_SDRAM_BASE);
if (((u32) addr > base) &&
((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
return addr;
/* some U-Boot variants uses physical addresses */
base = RALINK_SOC_SDRAM_BASE;
if (((u32) addr > base) &&
((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
return (void *)KSEG0ADDR(addr);
return NULL;
}
static __init char *ramips_prom_getargv(const char *name)
{
int len = strlen(name);
int i;
if (!ramips_prom_argv) {
printk(KERN_DEBUG "argv=%p is invalid, skipping\n",
ramips_prom_argv);
return NULL;
}
for (i = 0; i < ramips_prom_argc; i++) {
char *argv = to_ram_addr(ramips_prom_argv[i]);
if (!argv) {
printk(KERN_DEBUG
"argv[%d]=%p is invalid, skipping\n",
i, ramips_prom_argv[i]);
continue;
}
printk(KERN_DEBUG "argv[%d]: %s\n", i, argv);
if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
return argv + len + 1;
}
return NULL;
}
static __init char *ramips_prom_getenv(const char *envname)
{
#define PROM_MAX_ENVS 256
int len = strlen(envname);
char **env;
int i;
env = ramips_prom_envp;
if (!env) {
printk(KERN_DEBUG "envp=%p is not in RAM, skipping\n",
ramips_prom_envp);
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] == '=')
return p + len + 1;
}
return NULL;
#undef PROM_MAX_ENVS
}
static __init void find_board_byname(char *name)
{
int i;
for (i = 0; i < ARRAY_SIZE(boards); i++)
if (strcmp(name, boards[i].name) == 0) {
ramips_mach = boards[i].mach_type;
break;
}
}
void __init prom_init(void)
{
char *p;
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);
ramips_prom_argc = fw_arg0;
ramips_prom_argv = to_ram_addr((void *)fw_arg1);
ramips_prom_envp = to_ram_addr((void *)fw_arg2);
p = ramips_prom_getargv("board");
if (!p)
p = ramips_prom_getenv("board");
if (p)
find_board_byname(p);
}
void __init prom_free_prom_memory(void)
{
/* We do not have to prom memory to free */
}
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