MIPS: JZ4740: setup: Autodetect physical memory.

/*

 *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>

 *  Copyright (C) 2011, Maarten ter Huurne <maarten@treewalker.org>

 *  JZ4740 setup code

 *

 *  This program is free software; you can redistribute it and/or modify it

 */

#include <linux/init.h>

#include <linux/io.h>

#include <linux/kernel.h>

#include <asm/bootinfo.h>

#include <asm/mach-jz4740/base.h>

#include "reset.h"

#define JZ4740_EMC_SDRAM_CTRL 0x80

static void __init jz4740_detect_mem(void)

{

	void __iomem *jz_emc_base;

	u32 ctrl, bus, bank, rows, cols;

	phys_t size;

	jz_emc_base = ioremap(JZ4740_EMC_BASE_ADDR, 0x100);

	ctrl = readl(jz_emc_base + JZ4740_EMC_SDRAM_CTRL);

	bus = 2 - ((ctrl >> 31) & 1);

	bank = 1 + ((ctrl >> 19) & 1);

	cols = 8 + ((ctrl >> 26) & 7);

	rows = 11 + ((ctrl >> 20) & 3);

	printk(KERN_DEBUG

		"SDRAM preconfigured: bus:%u bank:%u rows:%u cols:%u\n",

		bus, bank, rows, cols);

	iounmap(jz_emc_base);

	size = 1 << (bus + bank + cols + rows);

	add_memory_region(0, size, BOOT_MEM_RAM);

}

void __init plat_mem_setup(void)

{

	jz4740_reset_init();

	jz4740_detect_mem();

}

const char *get_system_type(void)