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/init.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/nand_ecc.h>
#include <asm/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 mtd_info 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];

	u8 __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;

/* 512-byte page with 4-bit ECC, 8-bit */
static struct nand_ecclayout oob_512_8bit_ecc4 = {
	.eccbytes = 8,
	.eccpos = {8, 9, 10, 11, 12, 13, 14, 15},
	.oobfree = { {0, 5}, {6, 2} },
};

/* 512-byte page with 4-bit ECC, 16-bit */
static struct nand_ecclayout oob_512_16bit_ecc4 = {
	.eccbytes = 8,
	.eccpos = {8, 9, 10, 11, 12, 13, 14, 15},
	.oobfree = { {2, 6}, },
};

/* 2048-byte page size with 4-bit ECC */
static struct nand_ecclayout oob_2048_ecc4 = {
	.eccbytes = 32,
	.eccpos = {
		8, 9, 10, 11, 12, 13, 14, 15,
		16, 17, 18, 19, 20, 21, 22, 23,
		24, 25, 26, 27, 28, 29, 30, 31,
		32, 33, 34, 35, 36, 37, 38, 39,
	},
	.oobfree = { {2, 6}, {40, 24} },
};

/* 4096-byte page size with 4-bit ECC */
static struct nand_ecclayout oob_4096_ecc4 = {
	.eccbytes = 64,
	.eccpos = {
		8, 9, 10, 11, 12, 13, 14, 15,
		16, 17, 18, 19, 20, 21, 22, 23,
		24, 25, 26, 27, 28, 29, 30, 31,
		32, 33, 34, 35, 36, 37, 38, 39,
		40, 41, 42, 43, 44, 45, 46, 47,
		48, 49, 50, 51, 52, 53, 54,