path: root/drivers/mtd/nand/sh_flctl.c

/*
 * SuperH FLCTL nand controller
 *
 * Copyright (c) 2008 Renesas Solutions Corp.
 * Copyright (c) 2008 Atom Create Engineering Co., Ltd.
 *
 * Based on fsl_elbc_nand.c, Copyright (c) 2006-2007 Freescale Semiconductor
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/sh_dma.h>
#include <linux/slab.h>
#include <linux/string.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/sh_flctl.h>

static int flctl_4secc_ooblayout_sp_ecc(struct mtd_info *mtd, int section,
					struct mtd_oob_region *oobregion)
{
	struct nand_chip *chip = mtd_to_nand(mtd);

	if (section)
		return -ERANGE;

	oobregion->offset = 0;
	oobregion->length = chip->ecc.bytes;

	return 0;
}

static int flctl_4secc_ooblayout_sp_free(struct mtd_info *mtd, int section,
					 struct mtd_oob_region *oobregion)
{
	if (section)
		return -ERANGE;

	oobregion->offset = 12;
	oobregion->length = 4;

	return 0;
}

static const struct mtd_ooblayout_ops flctl_4secc_oob_smallpage_ops = {
	.ecc = flctl_4secc_ooblayout_sp_ecc,
	.free = flctl_4secc_ooblayout_sp_free,
};

static int flctl_4secc_ooblayout_lp_ecc(struct mtd_info *mtd, int section,
					struct mtd_oob_region *oobregion)
{
	struct nand_chip *chip = mtd_to_nand(mtd);

	if (section >= chip->ecc.steps)
		return -ERANGE;

	oobregion->offset = (section * 16) + 6;
	oobregion->length = chip->ecc.bytes;

	return 0;
}

static int flctl_4secc_ooblayout_lp_free(struct mtd_info *mtd, int section,
					 struct mtd_oob_region *oobregion)
{
	struct nand_chip *chip = mtd_to_nand(mtd);

	if (section >= chip->ecc.steps)
		return -ERANGE;

	oobregion->offset = section * 16;
	oobregion->length = 6;

	if (!section) {
		oobregion->offset += 2;
		oobregion->length -= 2;
	}

	return 0;
}

static const struct mtd_ooblayout_ops flctl_4secc_oob_largepage_ops = {
	.ecc = flctl_4secc_ooblayout_lp_ecc,
	.free = flctl_4secc_ooblayout_lp_free,
};

static uint8_t scan_ff_pattern[] = { 0xff, 0xff };

static struct nand_bbt_descr flctl_4secc_smallpage = {
	.options = NAND_BBT_SCAN2NDPAGE,
	.offs = 11,
	.len = 1,
	.pattern = scan_ff_pattern,
};

static struct nand_bbt_descr flctl_4secc_largepage = {
	.options = NAND_BBT_SCAN2NDPAGE,
	.offs = 0,
	.len = 2,
	.pattern = scan_ff_pattern,
};

static void empty_fifo(struct sh_flctl *flctl)
{
	writel(flctl->flintdmacr_base | AC1CLR | AC0CLR, FLINTDMACR(flctl));