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/*
* Atheros AR71xx SoC specific prom routines
*
* Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
* Copyright (C) 2008 Imre Kaloz <kaloz@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/io.h>
#include <linux/serial_reg.h>
#include <asm/bootinfo.h>
#include <asm/addrspace.h>
#include <asm/mach-ar71xx/ar71xx.h>
struct board_rec {
char *name;
unsigned long mach_type;
};
static int prom_argc __initdata;
static char **prom_argv __initdata;
static char **prom_envp __initdata;
static struct board_rec boards[] __initdata = {
{
.name = "411",
.mach_type = MACH_AR71XX_RB_411,
}, {
.name = "433",
.mach_type = MACH_AR71XX_RB_433,
}, {
.name = "450",
.mach_type = MACH_AR71XX_RB_450,
}
};
char *(*prom_getenv)(const char *envname) __initdata;
static __init char *dummy_getenv(const char *envname)
{
return NULL;
}
static void __init routerboot_printargs(void)
{
int i;
for (i = 0; i < prom_argc; i++)
printk(KERN_DEBUG "prom: routerboot envp[%d]: %s\n",
i, prom_envp[i]);
}
static __init char *routerboot_getenv(const char *envname)
{
char **env;
int i = strlen(envname);
for (env = prom_envp; *env != NULL; env++)
if (strncmp(envname, *env, i) == 0 && (*env)[i] == '=')
return *env + i + 1;
return NULL;
}
static __init unsigned long find_board_byname(char *name)
{
int i;
for (i = 0; i < ARRAY_SIZE(boards); i++)
if (strcmp(name, boards[i].name) == 0)
return boards[i].mach_type;
return MACH_AR71XX_GENERIC;
}
void __init prom_init(void)
{
char *board;
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);
prom_getenv = dummy_getenv;
if ((fw_arg0 == 7) && (fw_arg2 == 0)) {
prom_argc = fw_arg0;
prom_envp = (char **)fw_arg1;
prom_getenv = routerboot_getenv;
routerboot_printargs();
}
board = prom_getenv("board");
if (board)
mips_machtype = find_board_byname(board);
else
mips_machtype = MACH_AR71XX_GENERIC;
ar71xx_print_cmdline();
}
void __init prom_free_prom_memory(void)
{
/* We do not have to prom memory to free */
}
#define UART_READ(r) \
__raw_readl((void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4 * (r)))
#define UART_WRITE(r, v) \
__raw_writel((v), (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4*(r)))
void prom_putchar(unsigned char ch)
{
while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
UART_WRITE(UART_TX, ch);
while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
}
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