openwrt-xburst/target/linux/ar71xx/files-2.6.39/arch/mips/ar71xx/dev-m25p80.c

/*
 *  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/init.h>
#include <linux/spi/spi.h>
#include <linux/spi/flash.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/concat.h>

#include "devices.h"
#include "dev-m25p80.h"

static struct spi_board_info ar71xx_spi_info[] = {
	{
		.bus_num	= 0,
		.chip_select	= 0,
		.max_speed_hz	= 25000000,
		.modalias	= "m25p80",
	},
	{
		.bus_num	= 0,
		.chip_select	= 1,
		.max_speed_hz   = 25000000,
		.modalias   = "m25p80",
	}
};

void __init ar71xx_add_device_m25p80(struct flash_platform_data *pdata)
{
	ar71xx_spi_info[0].platform_data = pdata;
	ar71xx_add_device_spi(NULL, ar71xx_spi_info, 1);
}

static struct flash_platform_data *multi_pdata;

static struct mtd_info *concat_devs[2] = { NULL, NULL };
static struct work_struct mtd_concat_work;

static void mtd_concat_add_work(struct work_struct *work)
{
	struct mtd_info *mtd;

	mtd = mtd_concat_create(concat_devs, ARRAY_SIZE(concat_devs), "flash");

#ifdef CONFIG_MTD_PARTITIONS
	add_mtd_partitions(mtd, multi_pdata->parts, multi_pdata->nr_parts);
#else
	add_mtd_device(mtd);
#endif
}

static void mtd_concat_add(struct mtd_info *mtd)
{
	static bool registered = false;

	if (registered)
		return;

	if (!strcmp(mtd->name, "spi0.0"))
		concat_devs[0] = mtd;
	else if (!strcmp(mtd->name, "spi0.1"))
		concat_devs[1] = mtd;
	else
		return;

	if (!concat_devs[0] || !concat_devs[1])
		return;

	registered = true;
	INIT_WORK(&mtd_concat_work, mtd_concat_add_work);
	schedule_work(&mtd_concat_work);
}

static void mtd_concat_remove(struct mtd_info *mtd)
{
}

static void add_mtd_concat_notifier(void)
{
	static struct mtd_notifier not = {
		.add = mtd_concat_add,
		.remove = mtd_concat_remove,
	};

	register_mtd_user(&not);
}


void __init ar71xx_add_device_m25p80_multi(struct flash_platform_data *pdata)
{
	multi_pdata = pdata;
	add_mtd_concat_notifier();
	ar71xx_add_device_spi(NULL, ar71xx_spi_info, ARRAY_SIZE(ar71xx_spi_info));
}