146 lines
3.1 KiB
C
146 lines
3.1 KiB
C
/*
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* Ralink RT305x SoC specific prom routines
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*
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* Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <asm/bootinfo.h>
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#include <asm/mach-ralink/common.h>
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#include <asm/mach-ralink/machine.h>
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#include <asm/mach-ralink/rt305x.h>
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#include <asm/mach-ralink/rt305x_regs.h>
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struct board_rec {
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char *name;
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enum ramips_mach_type mach_type;
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};
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static int rt305x_prom_argc __initdata;
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static char **rt305x_prom_argv __initdata;
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static char **rt305x_prom_envp __initdata;
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static struct board_rec boards[] __initdata = {
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{
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.name = "WHR-G300N",
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.mach_type = RAMIPS_MACH_WHR_G300N,
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}
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};
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static inline void *to_ram_addr(void *addr)
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{
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u32 base;
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base = KSEG0ADDR(RT305X_SDRAM_BASE);
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if (((u32) addr > base) &&
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((u32) addr < (base + RT305X_MEM_SIZE_MAX)))
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return addr;
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base = KSEG1ADDR(RT305X_SDRAM_BASE);
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if (((u32) addr > base) &&
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((u32) addr < (base + RT305X_MEM_SIZE_MAX)))
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return addr;
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/* some U-Boot variants uses physical addresses */
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base = RT305X_SDRAM_BASE;
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if (((u32) addr > base) &&
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((u32) addr < (base + RT305X_MEM_SIZE_MAX)))
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return (void *)KSEG0ADDR(addr);
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return NULL;
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}
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static __init char *rt305x_prom_getargv(const char *name)
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{
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int len = strlen(name);
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int i;
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if (!rt305x_prom_argv) {
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printk(KERN_DEBUG "argv=%p is invalid, skipping\n",
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rt305x_prom_argv);
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return NULL;
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}
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for (i = 0; i < rt305x_prom_argc; i++) {
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char *argv = to_ram_addr(rt305x_prom_argv[i]);
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if (!argv) {
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printk(KERN_DEBUG
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"argv[%d]=%p is invalid, skipping\n",
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i, rt305x_prom_argv[i]);
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continue;
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}
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printk(KERN_DEBUG "argv[i]: %s\n", argv);
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if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
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return argv + len + 1;
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}
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return NULL;
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}
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static __init char *rt305x_prom_getenv(const char *envname)
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{
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int len = strlen(envname);
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char **env;
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char *p;
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env = rt305x_prom_envp;
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if (!env) {
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printk(KERN_DEBUG "envp=%p is not in RAM, skipping\n",
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rt305x_prom_envp);
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return NULL;
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}
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for (p = to_ram_addr(*env); p; env++) {
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printk(KERN_DEBUG "env: %s\n", *env);
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if (strncmp(envname, p, len) == 0 && (p)[len] == '=')
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return p + len + 1;
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}
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return NULL;
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}
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static __init void find_board_byname(char *name)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(boards); i++)
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if (strcmp(name, boards[i].name) == 0) {
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ramips_mach = boards[i].mach_type;
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break;
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}
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}
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void __init prom_init(void)
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{
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char *p;
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printk(KERN_DEBUG
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"prom: fw_arg0=%08x, fw_arg1=%08x, fw_arg2=%08x, fw_arg3=%08x\n",
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(unsigned int)fw_arg0, (unsigned int)fw_arg1,
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(unsigned int)fw_arg2, (unsigned int)fw_arg3);
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rt305x_prom_argc = fw_arg0;
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rt305x_prom_argv = to_ram_addr((void *)fw_arg1);
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rt305x_prom_envp = to_ram_addr((void *)fw_arg2);
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p = rt305x_prom_getargv("board");
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if (!p)
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p = rt305x_prom_getenv("board");
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if (p)
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find_board_byname(p);
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}
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void __init prom_free_prom_memory(void)
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{
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/* We do not have to prom memory to free */
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}
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