openwrtv4/target/linux/ramips/files/arch/mips/ralink/rt305x/prom.c
Gabor Juhos 298202afb8 share machine registration code
SVN-Revision: 17456
2009-08-31 18:53:34 +00:00

145 lines
3.1 KiB
C

/*
* Ralink RT305x 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 <asm/bootinfo.h>
#include <asm/mach-ralink/common.h>
#include <asm/mach-ralink/machine.h>
#include <asm/mach-ralink/rt305x.h>
#include <asm/mach-ralink/rt305x_regs.h>
struct board_rec {
char *name;
enum ramips_mach_type mach_type;
};
static int rt305x_prom_argc __initdata;
static char **rt305x_prom_argv __initdata;
static char **rt305x_prom_envp __initdata;
static struct board_rec boards[] __initdata = {
{
.name = "WHR-G300N",
.mach_type = RAMIPS_MACH_WHR_G300N,
}
};
static inline void *to_ram_addr(void *addr)
{
u32 base;
base = KSEG0ADDR(RT305X_SDRAM_BASE);
if (((u32) addr > base) &&
((u32) addr < (base + RT305X_MEM_SIZE_MAX)))
return addr;
base = KSEG1ADDR(RT305X_SDRAM_BASE);
if (((u32) addr > base) &&
((u32) addr < (base + RT305X_MEM_SIZE_MAX)))
return addr;
/* some U-Boot variants uses physical addresses */
base = RT305X_SDRAM_BASE;
if (((u32) addr > base) &&
((u32) addr < (base + RT305X_MEM_SIZE_MAX)))
return (void *)KSEG0ADDR(addr);
return NULL;
}
static __init char *rt305x_prom_getargv(const char *name)
{
int len = strlen(name);
int i;
if (!rt305x_prom_argv) {
printk(KERN_DEBUG "argv=%p is invalid, skipping\n",
rt305x_prom_argv);
return NULL;
}
for (i = 0; i < rt305x_prom_argc; i++) {
char *argv = to_ram_addr(rt305x_prom_argv[i]);
if (!argv) {
printk(KERN_DEBUG
"argv[%d]=%p is invalid, skipping\n",
i, rt305x_prom_argv[i]);
continue;
}
printk(KERN_DEBUG "argv[i]: %s\n", argv);
if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
return argv + len + 1;
}
return NULL;
}
static __init char *rt305x_prom_getenv(const char *envname)
{
int len = strlen(envname);
char **env;
char *p;
env = rt305x_prom_envp;
if (!env) {
printk(KERN_DEBUG "envp=%p is not in RAM, skipping\n",
rt305x_prom_envp);
return NULL;
}
for (p = to_ram_addr(*env); p; env++) {
printk(KERN_DEBUG "env: %s\n", *env);
if (strncmp(envname, p, len) == 0 && (p)[len] == '=')
return p + len + 1;
}
return NULL;
}
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);
rt305x_prom_argc = fw_arg0;
rt305x_prom_argv = to_ram_addr((void *)fw_arg1);
rt305x_prom_envp = to_ram_addr((void *)fw_arg2);
p = rt305x_prom_getargv("board");
if (!p)
p = rt305x_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 */
}