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

/*
 * Freescale Integrated Flash Controller NAND driver
 *
 * Copyright 2011-2012 Freescale Semiconductor, Inc
 *
 * Author: Dipen Dudhat <Dipen.Dudhat@freescale.com>
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/of_address.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/rawnand.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/nand_ecc.h>
#include <linux/fsl_ifc.h>

#define ERR_BYTE		0xFF /* Value returned for read
					bytes when read failed	*/
#define IFC_TIMEOUT_MSECS	500  /* Maximum number of mSecs to wait
					for IFC NAND Machine	*/

struct fsl_ifc_ctrl;

/* mtd information per set */
struct fsl_ifc_mtd {
	struct nand_chip chip;
	struct fsl_ifc_ctrl *ctrl;

	struct device *dev;
	int bank;		/* Chip select bank number		*/
	unsigned int bufnum_mask; /* bufnum = page & bufnum_mask */
	u8 __iomem *vbase;      /* Chip select base virtual address	*/
};

/* overview of the fsl ifc controller */
struct fsl_ifc_nand_ctrl {
	struct nand_hw_control controller;
	struct fsl_ifc_mtd *chips[FSL_IFC_BANK_COUNT];

	void __iomem *addr;	/* Address of assigned IFC buffer	*/
	unsigned int page;	/* Last page written to / read from	*/
	unsigned int read_bytes;/* Number of bytes read during command	*/
	unsigned int column;	/* Saved column from SEQIN		*/
	unsigned int index;	/* Pointer to next byte to 'read'	*/
	unsigned int oob;	/* Non zero if operating on OOB data	*/
	unsigned int eccread;	/* Non zero for a full-page ECC read	*/
	unsigned int counter;	/* counter for the initializations	*/
	unsigned int max_bitflips;  /* Saved during READ0 cmd		*/
};

static struct fsl_ifc_nand_ctrl *ifc_nand_ctrl;

/*
 * Generic flash bbt descriptors
 */
static u8 bbt_pattern[] = {'B', 'b', 't', '0' };
static u8 mirror_pattern[] = {'1', 't', 'b', 'B' };

static struct nand_bbt_descr bbt_main_descr = {
	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
		   NAND_BBT_2BIT | NAND_BBT_VERSION,
	.offs =	2, /* 0 on 8-bit small page */
	.len = 4,
	.veroffs = 6,
	.maxblocks = 4,
	.pattern = bbt_pattern,
};

static struct nand_bbt_descr bbt_mirror_descr = {
	.options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
		   NAND_BBT_2BIT | NAND_BBT_VERSION,
	.offs =	2, /* 0 on 8-bit small page */
	.len = 4,
	.veroffs = 6,
	.maxblocks = 4,
	.pattern = mirror_pattern,
};

static int fsl_ifc_ooblayout_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 = 8;
	oobregion->length = chip->ecc.total;

	return 0;
}

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

	if (section > 1)
		return -ERANGE;

	if (mtd->writesize == 512 &&
	    !(chip->options & NAND_BUSWIDTH_16)) {
		if (!section) {
			oobregion->offset = 0;
			oobregion->length = 5;
		} else {
			oobregion->offset = 6;
			oobregion->length = 2;
		}

		return 0;
	}

	if (!section) {
		oobregion->offset = 2;
		oobregion->length = 6;
	} else {
		oobregion->offset = chip->ecc.total + 8;
		oobregion->length = mtd->oobsize - oobregion->offset;
	}

	return 0;
}

static const struct mtd_ooblayout_ops fsl_ifc_ooblayout_ops = {
	.ecc = fsl_ifc_ooblayout_ecc,
	.free = fsl_ifc_ooblayout_free,
};

/*
 * Set up the IFC hardware block and page address fields, and the ifc nand
 * structure addr field to point to the correct IFC buffer in memory
 */
static void set_addr(struct mtd_info *mtd, int column, int page_addr, int oob)
{
	struct nand_chip *chip = mtd_to_nand(mtd);
	struct fsl_ifc_mtd *priv = nand_get_controller_data(chip);
	struct fsl_ifc_ctrl *ctrl = priv->ctrl;
	struct fsl_ifc_runtime __iomem *ifc = ctrl->rregs;
	int buf_num;

	ifc_nand_ctrl->page = page_addr;
	/* Program ROW0/COL0 */
	ifc_out32(page_addr, &ifc->ifc_nand.row0);
	ifc_out32((oob