staging: Remove the mt29f_spinand driver

A new SPI NAND subsystem has been added in drivers/mtd/nand/spi/ and
Micron's MT29F devices are now supported in
drivers/mtd/nand/spi/micron.c.

Remove the old driver.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

1 files changed, 0 insertions, 980 deletions

diff --git a/drivers/staging/mt29f_spinand/mt29f_spinand.c b/drivers/staging/mt29f_spinand/mt29f_spinand.c
deleted file mode 100644
index def8a1f57d1c..000000000000
--- a/drivers/staging/mt29f_spinand/mt29f_spinand.c
+++ /dev/null
@@ -1,980 +0,0 @@
-/*
- * Copyright (c) 2003-2013 Broadcom Corporation
- *
- * Copyright (c) 2009-2010 Micron Technology, Inc.
- *
- * 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.
- */
-
-#include <linux/module.h>
-#include <linux/delay.h>
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/partitions.h>
-#include <linux/mtd/rawnand.h>
-#include <linux/spi/spi.h>
-
-#include "mt29f_spinand.h"
-
-#define BUFSIZE (10 * 64 * 2048)
-#define CACHE_BUF 2112
-/*
- * OOB area specification layout:  Total 32 available free bytes.
- */
-
-static inline struct spinand_state *mtd_to_state(struct mtd_info *mtd)
-{
-	struct nand_chip *chip = mtd_to_nand(mtd);
-	struct spinand_info *info = nand_get_controller_data(chip);
-	struct spinand_state *state = info->priv;
-
-	return state;
-}
-
-#ifdef CONFIG_MTD_SPINAND_ONDIEECC
-static int enable_hw_ecc;
-static int enable_read_hw_ecc;
-
-static int spinand_ooblayout_64_ecc(struct mtd_info *mtd, int section,
-				    struct mtd_oob_region *oobregion)
-{
-	if (section > 3)
-		return -ERANGE;
-
-	oobregion->offset = (section * 16) + 1;
-	oobregion->length = 6;
-
-	return 0;
-}
-
-static int spinand_ooblayout_64_free(struct mtd_info *mtd, int section,
-				     struct mtd_oob_region *oobregion)
-{
-	if (section > 3)
-		return -ERANGE;
-
-	oobregion->offset = (section * 16) + 8;
-	oobregion->length = 8;
-
-	return 0;
-}
-
-static const struct mtd_ooblayout_ops spinand_oob_64_ops = {
-	.ecc = spinand_ooblayout_64_ecc,
-	.free = spinand_ooblayout_64_free,
-};
-#endif
-
-/**
- * spinand_cmd - process a command to send to the SPI Nand
- * Description:
- *    Set up the command buffer to send to the SPI controller.
- *    The command buffer has to initialized to 0.
- */
-
-static int spinand_cmd(struct spi_device *spi, struct spinand_cmd *cmd)
-{
-	struct spi_message message;
-	struct spi_transfer x[4];
-	u8 dummy = 0xff;
-
-	spi_message_init(&message);
-	memset(x, 0, sizeof(x));
-
-	x[0].len = 1;
-	x[0].tx_buf = &cmd->cmd;
-	spi_message_add_tail(&x[0], &message);
-
-	if (cmd->n_addr) {
-		x[1].len = cmd->n_addr;
-		x[1].tx_buf = cmd->addr;
-		spi_message_add_tail(&x[1], &message);
-	}
-
-	if (cmd->n_dummy) {
-		x[2].len = cmd->n_dummy;
-		x[2].tx_buf = &dummy;
-		spi_message_add_tail(&x[2], &message);
-	}
-
-	if (cmd->n_tx) {
-		x[3].len = cmd->n_tx;
-		x[3].tx_buf = cmd->tx_buf;
-		spi_message_add_tail(&x[3], &message);
-	}
-
-	if (cmd->n_rx) {
-		x[3].len = cmd->n_rx;
-		x[3].rx_buf = cmd->rx_buf;
-		spi_message_add_tail(&x[3], &message);
-	}
-
-	return spi_sync(spi, &message);
-}
-
-/**
- * spinand_read_id - Read SPI Nand ID
- * Description:
- *    read two ID bytes from the SPI Nand device
- */
-static int spinand_read_id(struct spi_device *spi_nand, u8 *id)
-{
-	int retval;
-	u8 nand_id[3];
-	struct spinand_cmd cmd = {0};
-
-	cmd.cmd = CMD_READ_ID;
-	cmd.n_rx = 3;
-	cmd.rx_buf = &nand_id[0];
-
-	retval = spinand_cmd(spi_nand, &cmd);
-	if (retval < 0) {
-		dev_err(&spi_nand->dev, "error %d reading id\n", retval);
-		return retval;
-	}
-	id[0] = nand_id[1];
-	id[1] = nand_id[2];
-	return retval;
-}
-
-/**
- * spinand_read_status - send command 0xf to the SPI Nand status register
- * Description:
- *    After read, write, or erase, the Nand device is expected to set the
- *    busy status.
- *    This function is to allow reading the status of the command: read,
- *    write, and erase.
- *    Once the status turns to be ready, the other status bits also are
- *    valid status bits.
- */
-static int spinand_read_status(struct spi_device *spi_nand, u8 *status)
-{
-	struct spinand_cmd cmd = {0};
-	int ret;
-
-	cmd.cmd = CMD_READ_REG;
-	cmd.n_addr = 1;
-	cmd.addr[0] = REG_STATUS;
-	cmd.n_rx = 1;
-	cmd.rx_buf = status;
-
-	ret = spinand_cmd(spi_nand, &cmd);
-	if (ret < 0)
-		dev_err(&spi_nand->dev, "err: %d read status register\n", ret);
-
-	return ret;
-}
-
-#define MAX_WAIT_JIFFIES  (40 * HZ)
-static int wait_till_ready(struct spi_device *spi_nand)
-{
-	unsigned long deadline;
-	int retval;
-	u8 stat = 0;
-
-	deadline = jiffies + MAX_WAIT_JIFFIES;
-	do {
-		retval = spinand_read_status(spi_nand, &stat);
-		if (retval < 0)
-			return -1;
-		if (!(stat & 0x1))
-			break;
-
-		cond_resched();
-	} while (!time_after_eq(jiffies, deadline));
-
-	if ((stat & 0x1) == 0)
-		return 0;
-
-	return -1;
-}
-
-/**
- * spinand_get_otp - send command 0xf to read the SPI Nand OTP register
- * Description:
- *   There is one bit( bit 0x10 ) to set or to clear the internal ECC.
- *   Enable chip internal ECC, set the bit to 1
- *   Disable chip internal ECC, clear the bit to 0
- */
-static int spinand_get_otp(struct spi_device *spi_nand, u8 *otp)
-{
-	struct spinand_cmd cmd = {0};
-	int retval;
-
-	cmd.cmd = CMD_READ_REG;
-	cmd.n_addr = 1;
-	cmd.addr[0] = REG_OTP;
-	cmd.n_rx = 1;
-	cmd.rx_buf = otp;
-
-	retval = spinand_cmd(spi_nand, &cmd);
-	if (retval < 0)
-		dev_err(&spi_nand->dev, "error %d get otp\n", retval);
-	return retval;
-}
-
-/**
- * spinand_set_otp - send command 0x1f to write the SPI Nand OTP register
- * Description:
- *   There is one bit( bit 0x10 ) to set or to clear the internal ECC.
- *   Enable chip internal ECC, set the bit to 1
- *   Disable chip internal ECC, clear the bit to 0
- */
-static int spinand_set_otp(struct spi_device *spi_nand, u8 *otp)
-{
-	int retval;
-	struct spinand_cmd cmd = {0};
-
-	cmd.cmd = CMD_WRITE_REG;
-	cmd.n_addr = 1;
-	cmd.addr[0] = REG_OTP;
-	cmd.n_tx = 1;
-	cmd.tx_buf = otp;
-
-	retval = spinand_cmd(spi_nand, &cmd);
-	if (retval < 0)
-		dev_err(&spi_nand->dev, "error %d set otp\n", retval);
-
-	return retval;
-}
-
-#ifdef CONFIG_MTD_SPINAND_ONDIEECC
-/**
- * spinand_enable_ecc - send command 0x1f to write the SPI Nand OTP register
- * Description:
- *   There is one bit( bit 0x10 ) to set or to clear the internal ECC.
- *   Enable chip internal ECC, set the bit to 1
- *   Disable chip internal ECC, clear the bit to 0
- */
-static int spinand_enable_ecc(struct spi_device *spi_nand)
-{
-	int retval;
-	u8 otp = 0;
-
-	retval = spinand_get_otp(spi_nand, &otp);
-	if (retval < 0)
-		return retval;
-
-	if ((otp & OTP_ECC_MASK) == OTP_ECC_MASK)
-		return 0;
-	otp |= OTP_ECC_MASK;
-	retval = spinand_set_otp(spi_nand, &otp);
-	if (retval < 0)
-		return retval;
-	return spinand_get_otp(spi_nand, &otp);
-}
-#endif
-
-static int spinand_disable_ecc(struct spi_device *spi_nand)
-{
-	int retval;
-	u8 otp = 0;
-
-	retval = spinand_get_otp(spi_nand, &otp);
-	if (retval < 0)
-		return retval;
-
-	if ((otp & OTP_ECC_MASK) == OTP_ECC_MASK) {
-		otp &= ~OTP_ECC_MASK;
-		retval = spinand_set_otp(spi_nand, &otp);
-		if (retval < 0)
-			return retval;
-		return spinand_get_otp(spi_nand, &otp);
-	}
-	return 0;
-}
-
-/**
- * spinand_write_enable - send command 0x06 to enable write or erase the
- * Nand cells
- * Description:
- *   Before write and erase the Nand cells, the write enable has to be set.
- *   After the write or erase, the write enable bit is automatically
- *   cleared (status register bit 2)
- *   Set the bit 2 of the status register has the same effect
- */
-static int spinand_write_enable(struct spi_device *spi_nand)
-{
-	struct spinand_cmd cmd = {0};
-
-	cmd.cmd = CMD_WR_ENABLE;
-	return spinand_cmd(spi_nand, &cmd);
-}
-
-static int spinand_read_page_to_cache(struct spi_device *spi_nand, u16 page_id)
-{
-	struct spinand_cmd cmd = {0};
-	u16 row;
-
-	row = page_id;
-	cmd.cmd = CMD_READ;
-	cmd.n_addr = 3;
-	cmd.addr[0] = (u8)((row & 0xff0000) >> 16);
-	cmd.addr[1] = (u8)((row & 0xff00) >> 8);
-	cmd.addr[2] = (u8)(row & 0x00ff);
-
-	return spinand_cmd(spi_nand, &cmd);
-}
-
-/**
- * spinand_read_from_cache - send command 0x03 to read out the data from the
- * cache register (2112 bytes max)
- * Description:
- *   The read can specify 1 to 2112 bytes of data read at the corresponding
- *   locations.
- *   No tRd delay.
- */
-static int spinand_read_from_cache(struct spi_device *spi_nand, u16 page_id,
-				   u16 byte_id, u16 len, u8 *rbuf)
-{
-	struct spinand_cmd cmd = {0};
-	u16 column;
-
-	column = byte_id;
-	cmd.cmd = CMD_READ_RDM;
-	cmd.n_addr = 3;
-	cmd.addr[0] = (u8)((column & 0xff00) >> 8);
-	cmd.addr[0] |= (u8)(((page_id >> 6) & 0x1) << 4);
-	cmd.addr[1] = (u8)(column & 0x00ff);
-	cmd.addr[2] = (u8)(0xff);
-	cmd.n_dummy = 0;
-	cmd.n_rx = len;
-	cmd.rx_buf = rbuf;
-
-	return spinand_cmd(spi_nand, &cmd);
-}
-
-/**
- * spinand_read_page - read a page
- * @page_id: the physical page number
- * @offset:  the location from 0 to 2111
- * @len:     number of bytes to read
- * @rbuf:    read buffer to hold @len bytes
- *
- * Description:
- *   The read includes two commands to the Nand - 0x13 and 0x03 commands
- *   Poll to read status to wait for tRD time.
- */
-static int spinand_read_page(struct spi_device *spi_nand, u16 page_id,
-			     u16 offset, u16 len, u8 *rbuf)
-{
-	int ret;
-	u8 status = 0;
-
-#ifdef CONFIG_MTD_SPINAND_ONDIEECC
-	if (enable_read_hw_ecc) {
-		if (spinand_enable_ecc(spi_nand) < 0)
-			dev_err(&spi_nand->dev, "enable HW ECC failed!");
-	}
-#endif
-	ret = spinand_read_page_to_cache(spi_nand, page_id);
-	if (ret < 0)
-		return ret;
-
-	if (wait_till_ready(spi_nand))
-		dev_err(&spi_nand->dev, "WAIT timedout!!!\n");
-
-	while (1) {
-		ret = spinand_read_status(spi_nand, &status);
-		if (ret < 0) {
-			dev_err(&spi_nand->dev,
-				"err %d read status register\n", ret);
-			return ret;
-		}
-
-		if ((status & STATUS_OIP_MASK) == STATUS_READY) {
-			if ((status & STATUS_ECC_MASK) == STATUS_ECC_ERROR) {
-				dev_err(&spi_nand->dev, "ecc error, page=%d\n",
-					page_id);
-				return 0;
-			}
-			break;
-		}
-	}
-
-	ret = spinand_read_from_cache(spi_nand, page_id, offset, len, rbuf);
-	if (ret < 0) {
-		dev_err(&spi_nand->dev, "read from cache failed!!\n");
-		return ret;
-	}
-
-#ifdef CONFIG_MTD_SPINAND_ONDIEECC
-	if (enable_read_hw_ecc) {
-		ret = spinand_disable_ecc(spi_nand);
-		if (ret < 0) {
-			dev_err(&spi_nand->dev, "disable ecc failed!!\n");
-			return ret;
-		}
-		enable_read_hw_ecc = 0;
-	}
-#endif
-	return ret;
-}
-
-/**
- * spinand_program_data_to_cache - write a page to cache
- * @byte_id: the location to write to the cache
- * @len:     number of bytes to write
- * @wbuf:    write buffer holding @len bytes
- *
- * Description:
- *   The write command used here is 0x84--indicating that the cache is
- *   not cleared first.
- *   Since it is writing the data to cache, there is no tPROG time.
- */
-static int spinand_program_data_to_cache(struct spi_device *spi_nand,
-					 u16 page_id, u16 byte_id,
-					 u16 len, u8 *wbuf)
-{
-	struct spinand_cmd cmd = {0};
-	u16 column;
-
-	column = byte_id;
-	cmd.cmd = CMD_PROG_PAGE_CLRCACHE;
-	cmd.n_addr = 2;
-	cmd.addr[0] = (u8)((column & 0xff00) >> 8);
-	cmd.addr[0] |= (u8)(((page_id >> 6) & 0x1) << 4);
-	cmd.addr[1] = (u8)(column & 0x00ff);
-	cmd.n_tx = len;
-	cmd.tx_buf = wbuf;
-
-	return spinand_cmd(spi_nand, &cmd);
-}
-
-/**
- * spinand_program_execute - write a page from cache to the Nand array
- * @page_id: the physical page location to write the page.
- *
- * Description:
- *   The write command used here is 0x10--indicating the cache is writing to
- *   the Nand array.
- *   Need to wait for tPROG time to finish the transaction.
- */
-static int spinand_program_execute(struct spi_device *spi_nand, u16 page_id)
-{
-	struct spinand_cmd cmd = {0};
-	u16 row;
-
-	row = page_id;
-	cmd.cmd = CMD_PROG_PAGE_EXC;
-	cmd.n_addr = 3;
-	cmd.addr[0] = (u8)((row & 0xff0000) >> 16);
-	cmd.addr[1] = (u8)((row & 0xff00) >> 8);
-	cmd.addr[2] = (u8)(row & 0x00ff);
-
-	return spinand_cmd(spi_nand, &cmd);
-}
-
-/**
- * spinand_program_page - write a page
- * @page_id: the physical page location to write the page.
- * @offset:  the location from the cache starting from 0 to 2111
- * @len:     the number of bytes to write
- * @buf:     the buffer holding @len bytes
- *
- * Description:
- *   The commands used here are 0x06, 0x84, and 0x10--indicating that
- *   the write enable is first sent, the write cache command, and the
- *   write execute command.
- *   Poll to wait for the tPROG time to finish the transaction.
- */
-static int spinand_program_page(struct spi_device *spi_nand,
-				u16 page_id, u16 offset, u16 len, u8 *buf)
-{
-	int retval;
-	u8 status = 0;
-	u8 *wbuf;
-#ifdef CONFIG_MTD_SPINAND_ONDIEECC
-	unsigned int i, j;
-
-	wbuf = devm_kzalloc(&spi_nand->dev, CACHE_BUF, GFP_KERNEL);
-	if (!wbuf)
-		return -ENOMEM;
-
-	enable_read_hw_ecc = 1;
-	retval = spinand_read_page(spi_nand, page_id, 0, CACHE_BUF, wbuf);
-	if (retval < 0) {
-		dev_err(&spi_nand->dev, "ecc error on read page!!!\n");
-		return retval;
-	}
-
-	for (i = offset, j = 0; i < len; i++, j++)
-		wbuf[i] &= buf[j];
-
-	if (enable_hw_ecc) {
-		retval = spinand_enable_ecc(spi_nand);
-		if (retval < 0) {
-			dev_err(&spi_nand->dev, "enable ecc failed!!\n");
-			return retval;
-		}
-	}
-#else
-	wbuf = buf;
-#endif
-	retval = spinand_write_enable(spi_nand);
-	if (retval < 0) {
-		dev_err(&spi_nand->dev, "write enable failed!!\n");
-		return retval;
-	}
-	if (wait_till_ready(spi_nand))
-		dev_err(&spi_nand->dev, "wait timedout!!!\n");
-
-	retval = spinand_program_data_to_cache(spi_nand, page_id,
-					       offset, len, wbuf);
-	if (retval < 0)
-		return retval;
-	retval = spinand_program_execute(spi_nand, page_id);
-	if (retval < 0)
-		return retval;
-	while (1) {
-		retval = spinand_read_status(spi_nand, &status);
-		if (retval < 0) {
-			dev_err(&spi_nand->dev,
-				"error %d reading status register\n", retval);
-			return retval;
-		}
-
-		if ((status & STATUS_OIP_MASK) == STATUS_READY) {
-			if ((status & STATUS_P_FAIL_MASK) == STATUS_P_FAIL) {
-				dev_err(&spi_nand->dev,
-					"program error, page %d\n", page_id);
-				return -1;
-			}
-			break;
-		}
-	}
-#ifdef CONFIG_MTD_SPINAND_ONDIEECC
-	if (enable_hw_ecc) {
-		retval = spinand_disable_ecc(spi_nand);
-		if (retval < 0) {
-			dev_err(&spi_nand->dev, "disable ecc failed!!\n");
-			return retval;
-		}
-		enable_hw_ecc = 0;
-	}
-#endif
-
-	return 0;
-}
-
-/**
- * spinand_erase_block_erase - erase a page
- * @block_id: the physical block location to erase.
- *
- * Description:
- *   The command used here is 0xd8--indicating an erase command to erase
- *   one block--64 pages
- *   Need to wait for tERS.
- */
-static int spinand_erase_block_erase(struct spi_device *spi_nand, u16 block_id)
-{
-	struct spinand_cmd cmd = {0};
-	u16 row;
-
-	row = block_id;
-	cmd.cmd = CMD_ERASE_BLK;
-	cmd.n_addr = 3;
-	cmd.addr[0] = (u8)((row & 0xff0000) >> 16);
-	cmd.addr[1] = (u8)((row & 0xff00) >> 8);
-	cmd.addr[2] = (u8)(row & 0x00ff);
-
-	return spinand_cmd(spi_nand, &cmd);
-}
-
-/**
- * spinand_erase_block - erase a page
- * @block_id: the physical block location to erase.
- *
- * Description:
- *   The commands used here are 0x06 and 0xd8--indicating an erase
- *   command to erase one block--64 pages
- *   It will first to enable the write enable bit (0x06 command),
- *   and then send the 0xd8 erase command
- *   Poll to wait for the tERS time to complete the tranaction.
- */
-static int spinand_erase_block(struct spi_device *spi_nand, u16 block_id)
-{
-	int retval;
-	u8 status = 0;
-
-	retval = spinand_write_enable(spi_nand);
-	if (wait_till_ready(spi_nand))
-		dev_err(&spi_nand->dev, "wait timedout!!!\n");
-
-	retval = spinand_erase_block_erase(spi_nand, block_id);
-	while (1) {
-		retval = spinand_read_status(spi_nand, &status);
-		if (retval < 0) {
-			dev_err(&spi_nand->dev,
-				"error %d reading status register\n", retval);
-			return retval;
-		}
-
-		if ((status & STATUS_OIP_MASK) == STATUS_READY) {
-			if ((status & STATUS_E_FAIL_MASK) == STATUS_E_FAIL) {
-				dev_err(&spi_nand->dev,
-					"erase error, block %d\n", block_id);
-				return -1;
-			}
-			break;
-		}
-	}
-	return 0;
-}
-
-#ifdef CONFIG_MTD_SPINAND_ONDIEECC
-static int spinand_write_page_hwecc(struct nand_chip *chip,
-				    const u8 *buf, int oob_required,
-				    int page)
-{
-	const u8 *p = buf;
-	int eccsize = chip->ecc.size;
-	int eccsteps = chip->ecc.steps;
-
-	enable_hw_ecc = 1;
-	return nand_prog_page_op(chip, page, 0, p, eccsize * eccsteps);
-}
-
-static int spinand_read_page_hwecc(struct nand_chip *chip, u8 *buf,
-				   int oob_required, int page)
-{
-	int retval;
-	u8 status;
-	u8 *p = buf;
-	int eccsize = chip->ecc.size;
-	int eccsteps = chip->ecc.steps;
-	struct mtd_info *mtd = nand_to_mtd(chip);
-	struct spinand_info *info = nand_get_controller_data(chip);
-
-	enable_read_hw_ecc = 1;
-
-	nand_read_page_op(chip, page, 0, p, eccsize * eccsteps);
-	if (oob_required)
-		chip->legacy.read_buf(chip, chip->oob_poi, mtd->oobsize);
-
-	while (1) {
-		retval = spinand_read_status(info->spi, &status);
-		if (retval < 0) {
-			dev_err(&mtd->dev,
-				"error %d reading status register\n", retval);
-			return retval;
-		}
-
-		if ((status & STATUS_OIP_MASK) == STATUS_READY) {
-			if ((status & STATUS_ECC_MASK) == STATUS_ECC_ERROR) {
-				pr_info("spinand: ECC error\n");
-				mtd->ecc_stats.failed++;
-			} else if ((status & STATUS_ECC_MASK) ==
-					STATUS_ECC_1BIT_CORRECTED)
-				mtd->ecc_stats.corrected++;
-			break;
-		}
-	}
-	return 0;
-}
-#endif
-
-static void spinand_select_chip(struct nand_chip *chip, int dev)
-{
-}
-
-static u8 spinand_read_byte(struct nand_chip *chip)
-{
-	struct spinand_state *state = mtd_to_state(nand_to_mtd(chip));
-	u8 data;
-
-	data = state->buf[state->buf_ptr];
-	state->buf_ptr++;
-	return data;
-}
-
-static int spinand_wait(struct nand_chip *chip)
-{
-	struct mtd_info *mtd = nand_to_mtd(chip);
-	struct spinand_info *info = nand_get_controller_data(chip);
-
-	unsigned long timeo = jiffies;
-	int retval, state = chip->state;
-	u8 status;
-
-	if (state == FL_ERASING)
-		timeo += (HZ * 400) / 1000;
-	else
-		timeo += (HZ * 20) / 1000;
-
-	while (time_before(jiffies, timeo)) {
-		retval = spinand_read_status(info->spi, &status);
-		if (retval < 0) {
-			dev_err(&mtd->dev,
-				"error %d reading status register\n", retval);
-			return retval;
-		}
-
-		if ((status & STATUS_OIP_MASK) == STATUS_READY)
-			return 0;
-
-		cond_resched();
-	}
-	return 0;
-}
-
-static void spinand_write_buf(struct nand_chip *chip, const u8 *buf, int len)
-{
-	struct spinand_state *state = mtd_to_state(nand_to_mtd(chip));
-
-	memcpy(state->buf + state->buf_ptr, buf, len);
-	state->buf_ptr += len;
-}
-
-static void spinand_read_buf(struct nand_chip *chip, u8 *buf, int len)
-{
-	struct spinand_state *state = mtd_to_state(nand_to_mtd(chip));
-
-	memcpy(buf, state->buf + state->buf_ptr, len);
-	state->buf_ptr += len;
-}
-
-/*
- * spinand_reset- send RESET command "0xff" to the Nand device.
- */
-static void spinand_reset(struct spi_device *spi_nand)
-{
-	struct spinand_cmd cmd = {0};
-
-	cmd.cmd = CMD_RESET;
-
-	if (spinand_cmd(spi_nand, &cmd) < 0)
-		pr_info("spinand reset failed!\n");
-
-	/* elapse 1ms before issuing any other command */
-	usleep_range(1000, 2000);
-
-	if (wait_till_ready(spi_nand))
-		dev_err(&spi_nand->dev, "wait timedout!\n");
-}
-
-static void spinand_cmdfunc(struct nand_chip *chip, unsigned int command,
-			    int column, int page)
-{
-	struct mtd_info *mtd = nand_to_mtd(chip);
-	struct spinand_info *info = nand_get_controller_data(chip);
-	struct spinand_state *state = info->priv;
-
-	switch (command) {
-	/*
-	 * READ0 - read in first  0x800 bytes
-	 */
-	case NAND_CMD_READ1:
-	case NAND_CMD_READ0:
-		state->buf_ptr = 0;
-		spinand_read_page(info->spi, page, 0x0, 0x840, state->buf);
-		break;
-	/* READOOB reads only the OOB because no ECC is performed. */
-	case NAND_CMD_READOOB:
-		state->buf_ptr = 0;
-		spinand_read_page(info->spi, page, 0x800, 0x40, state->buf);
-		break;
-	case NAND_CMD_RNDOUT:
-		state->buf_ptr = column;
-		break;
-	case NAND_CMD_READID:
-		state->buf_ptr = 0;
-		spinand_read_id(info->spi, state->buf);
-		break;
-	case NAND_CMD_PARAM:
-		state->buf_ptr = 0;
-		break;
-	/* ERASE1 stores the block and page address */
-	case NAND_CMD_ERASE1:
-		spinand_erase_block(info->spi, page);
-		break;
-	/* ERASE2 uses the block and page address from ERASE1 */
-	case NAND_CMD_ERASE2:
-		break;
-	/* SEQIN sets up the addr buffer and all registers except the length */
-	case NAND_CMD_SEQIN:
-		state->col = column;
-		state->row = page;
-		state->buf_ptr = 0;
-		break;
-	/* PAGEPROG reuses all of the setup from SEQIN and adds the length */
-	case NAND_CMD_PAGEPROG:
-		spinand_program_page(info->spi, state->row, state->col,
-				     state->buf_ptr, state->buf);
-		break;
-	case NAND_CMD_STATUS:
-		spinand_get_otp(info->spi, state->buf);
-		if (!(state->buf[0] & 0x80))
-			state->buf[0] = 0x80;
-		state->buf_ptr = 0;
-		break;
-	/* RESET command */
-	case NAND_CMD_RESET:
-		if (wait_till_ready(info->spi))
-			dev_err(&info->spi->dev, "WAIT timedout!!!\n");
-		/* a minimum of 250us must elapse before issuing RESET cmd*/
-		usleep_range(250, 1000);
-		spinand_reset(info->spi);
-		break;
-	default:
-		dev_err(&mtd->dev, "Unknown CMD: 0x%x\n", command);
-	}
-}
-
-/**
- * spinand_lock_block - send write register 0x1f command to the Nand device
- *
- * Description:
- *    After power up, all the Nand blocks are locked.  This function allows
- *    one to unlock the blocks, and so it can be written or erased.
- */
-static int spinand_lock_block(struct spi_device *spi_nand, u8 lock)
-{
-	struct spinand_cmd cmd = {0};
-	int ret;
-	u8 otp = 0;
-
-	ret = spinand_get_otp(spi_nand, &otp);
-
-	cmd.cmd = CMD_WRITE_REG;
-	cmd.n_addr = 1;
-	cmd.addr[0] = REG_BLOCK_LOCK;
-	cmd.n_tx = 1;
-	cmd.tx_buf = &lock;
-
-	ret = spinand_cmd(spi_nand, &cmd);
-	if (ret < 0)
-		dev_err(&spi_nand->dev, "error %d lock block\n", ret);
-
-	return ret;
-}
-
-/**
- * spinand_probe - [spinand Interface]
- * @spi_nand: registered device driver.
- *
- * Description:
- *   Set up the device driver parameters to make the device available.
- */
-static int spinand_probe(struct spi_device *spi_nand)
-{
-	struct mtd_info *mtd;
-	struct nand_chip *chip;
-	struct spinand_info *info;
-	struct spinand_state *state;
-
-	info  = devm_kzalloc(&spi_nand->dev, sizeof(struct spinand_info),
-			     GFP_KERNEL);
-	if (!info)
-		return -ENOMEM;
-
-	info->spi = spi_nand;
-
-	spinand_lock_block(spi_nand, BL_ALL_UNLOCKED);
-
-	state = devm_kzalloc(&spi_nand->dev, sizeof(struct spinand_state),
-			     GFP_KERNEL);
-	if (!state)
-		return -ENOMEM;
-
-	info->priv	= state;
-	state->buf_ptr	= 0;
-	state->buf	= devm_kzalloc(&spi_nand->dev, BUFSIZE, GFP_KERNEL);
-	if (!state->buf)
-		return -ENOMEM;
-
-	chip = devm_kzalloc(&spi_nand->dev, sizeof(struct nand_chip),
-			    GFP_KERNEL);
-	if (!chip)
-		return -ENOMEM;
-
-#ifdef CONFIG_MTD_SPINAND_ONDIEECC
-	chip->ecc.mode	= NAND_ECC_HW;
-	chip->ecc.size	= 0x200;
-	chip->ecc.bytes	= 0x6;
-	chip->ecc.steps	= 0x4;
-
-	chip->ecc.strength = 1;
-	chip->ecc.total	= chip->ecc.steps * chip->ecc.bytes;
-	chip->ecc.read_page = spinand_read_page_hwecc;
-	chip->ecc.write_page = spinand_write_page_hwecc;
-#else
-	chip->ecc.mode	= NAND_ECC_SOFT;
-	chip->ecc.algo	= NAND_ECC_HAMMING;
-	if (spinand_disable_ecc(spi_nand) < 0)
-		dev_info(&spi_nand->dev, "%s: disable ecc failed!\n",
-			 __func__);
-#endif
-
-	nand_set_flash_node(chip, spi_nand->dev.of_node);
-	nand_set_controller_data(chip, info);
-	chip->legacy.read_buf	= spinand_read_buf;
-	chip->legacy.write_buf	= spinand_write_buf;
-	chip->legacy.read_byte	= spinand_read_byte;
-	chip->legacy.cmdfunc	= spinand_cmdfunc;
-	chip->legacy.waitfunc	= spinand_wait;
-	chip->options	|= NAND_CACHEPRG;
-	chip->select_chip = spinand_select_chip;
-	chip->legacy.set_features = nand_get_set_features_notsupp;
-	chip->legacy.get_features = nand_get_set_features_notsupp;
-
-	mtd = nand_to_mtd(chip);
-
-	dev_set_drvdata(&spi_nand->dev, mtd);
-
-	mtd->dev.parent = &spi_nand->dev;
-	mtd->oobsize = 64;
-#ifdef CONFIG_MTD_SPINAND_ONDIEECC
-	mtd_set_ooblayout(mtd, &spinand_oob_64_ops);
-#endif
-
-	if (nand_scan(chip, 1))
-		return -ENXIO;
-
-	return mtd_device_register(mtd, NULL, 0);
-}
-
-/**
- * spinand_remove - remove the device driver
- * @spi: the spi device.
- *
- * Description:
- *   Remove the device driver parameters and free up allocated memories.
- */
-static int spinand_remove(struct spi_device *spi)
-{
-	mtd_device_unregister(dev_get_drvdata(&spi->dev));
-
-	return 0;
-}
-
-static const struct of_device_id spinand_dt[] = {
-	{ .compatible = "spinand,mt29f", },
-	{}
-};
-MODULE_DEVICE_TABLE(of, spinand_dt);
-
-/*
- * Device name structure description
- */
-static struct spi_driver spinand_driver = {
-	.driver = {
-		.name		= "mt29f",
-		.of_match_table	= spinand_dt,
-	},
-	.probe		= spinand_probe,
-	.remove		= spinand_remove,
-};
-
-module_spi_driver(spinand_driver);
-
-MODULE_DESCRIPTION("SPI NAND driver for Micron");
-MODULE_AUTHOR("Henry Pan <hspan@micron.com>, Kamlakant Patel <kamlakant.patel@broadcom.com>");
-MODULE_LICENSE("GPL v2");