Initial support of driver brcmnand (from kernel 4.18)

index 9f5dc81..e2bd598 100644
@@ -15,6 +15,7 @@
 
 #include <config.h>
 
+#include <dm/device.h>
 #include <linux/compat.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/flashchip.h>

@@ -961,6 +962,17 @@ struct nand_chip {
 	void *priv;
 };
 
+static inline void nand_set_flash_node(struct nand_chip *chip,
+				       ofnode node)
+{
+	chip->flash_node = ofnode_to_offset(node);
+}
+
+static inline ofnode nand_get_flash_node(struct nand_chip *chip)
+{
+	return offset_to_ofnode(chip->flash_node);
+}
+
 static inline struct nand_chip *mtd_to_nand(struct mtd_info *mtd)
 {
 	return container_of(mtd, struct nand_chip, mtd);

index e2bd598..96b5847 100644
@@ -499,6 +499,13 @@ struct nand_hw_control {
 	struct nand_chip *active;
 };
 
+static inline void nand_hw_control_init(struct nand_hw_control *nfc)
+{
+	nfc->active = NULL;
+	spin_lock_init(&nfc->lock);
+	init_waitqueue_head(&nfc->wq);
+}
+
 /**
  * struct nand_ecc_step_info - ECC step information of ECC engine
  * @stepsize: data bytes per ECC step

index 92daebe..6cfede5 100644
@@ -484,14 +484,19 @@ static int nand_block_markbad_lowlevel(struct mtd_info *mtd, loff_t ofs)
 static int nand_check_wp(struct mtd_info *mtd)
 {
 	struct nand_chip *chip = mtd_to_nand(mtd);
+	u8 status;
+	int ret;
 
 	/* Broken xD cards report WP despite being writable */
 	if (chip->options & NAND_BROKEN_XD)
 		return 0;
 
 	/* Check the WP bit */
-	chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
-	return (chip->read_byte(mtd) & NAND_STATUS_WP) ? 0 : 1;
+	ret = nand_status_op(chip, &status);
+	if (ret)
+		return ret;
+
+	return status & NAND_STATUS_WP ? 0 : 1;
 }
 
 /**

@@ -573,11 +578,18 @@ static void nand_wait_status_ready(struct mtd_info *mtd, unsigned long timeo)
 {
 	register struct nand_chip *chip = mtd_to_nand(mtd);
 	u32 time_start;
+	int ret;
 
 	timeo = (CONFIG_SYS_HZ * timeo) / 1000;
 	time_start = get_timer(0);
 	while (get_timer(time_start) < timeo) {
-		if ((chip->read_byte(mtd) & NAND_STATUS_READY))
+		u8 status;
+
+		ret = nand_read_data_op(chip, &status, sizeof(status), true);
+		if (ret)
+			return;
+
+		if (status & NAND_STATUS_READY)
 			break;
 		WATCHDOG_RESET();
 	}

@@ -849,7 +861,15 @@ static void panic_nand_wait(struct mtd_info *mtd, struct nand_chip *chip,
 			if (chip->dev_ready(mtd))
 				break;
 		} else {
-			if (chip->read_byte(mtd) & NAND_STATUS_READY)
+			int ret;
+			u8 status;
+
+			ret = nand_read_data_op(chip, &status, sizeof(status),
+						true);
+			if (ret)
+				return;
+
+			if (status & NAND_STATUS_READY)
 				break;
 		}
 		mdelay(1);

@@ -865,8 +885,9 @@ static void panic_nand_wait(struct mtd_info *mtd, struct nand_chip *chip,
  */
 static int nand_wait(struct mtd_info *mtd, struct nand_chip *chip)
 {
-	int status;
 	unsigned long timeo = 400;
+	u8 status;
+	int ret;
 
 	led_trigger_event(nand_led_trigger, LED_FULL);
 

@@ -876,7 +897,9 @@ static int nand_wait(struct mtd_info *mtd, struct nand_chip *chip)
 	 */
 	ndelay(100);
 
-	chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
+	ret = nand_status_op(chip, NULL);
+	if (ret)
+		return ret;
 
  	u32 timer = (CONFIG_SYS_HZ * timeo) / 1000;
  	u32 time_start;

@@ -887,13 +910,21 @@ static int nand_wait(struct mtd_info *mtd, struct nand_chip *chip)
 			if (chip->dev_ready(mtd))
 				break;
 		} else {
-			if (chip->read_byte(mtd) & NAND_STATUS_READY)
+			ret = nand_read_data_op(chip, &status,
+						sizeof(status), true);
+			if (ret)
+				return ret;
+
+			if (status & NAND_STATUS_READY)
 				break;
 		}
 	}
 	led_trigger_event(nand_led_trigger, LED_OFF);
 
-	status = (int)chip->read_byte(mtd);
+	ret = nand_read_data_op(chip, &status, sizeof(status), true);
+	if (ret)
+		return ret;
+
 	/* This can happen if in case of timeout or buggy dev_ready */
 	WARN_ON(!(status & NAND_STATUS_READY));
 	return status;

@@ -1046,6 +1077,516 @@ static void __maybe_unused nand_release_data_interface(struct nand_chip *chip)
 }
 
 /**
+ * nand_read_page_op - Do a READ PAGE operation
+ * @chip: The NAND chip
+ * @page: page to read
+ * @offset_in_page: offset within the page
+ * @buf: buffer used to store the data
+ * @len: length of the buffer
+ *
+ * This function issues a READ PAGE operation.
+ * This function does not select/unselect the CS line.
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ */
+int nand_read_page_op(struct nand_chip *chip, unsigned int page,
+		      unsigned int offset_in_page, void *buf, unsigned int len)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+
+	if (len && !buf)
+		return -EINVAL;
+
+	if (offset_in_page + len > mtd->writesize + mtd->oobsize)
+		return -EINVAL;
+
+	chip->cmdfunc(mtd, NAND_CMD_READ0, offset_in_page, page);
+	if (len)
+		chip->read_buf(mtd, buf, len);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(nand_read_page_op);
+
+/**
+ * nand_read_param_page_op - Do a READ PARAMETER PAGE operation
+ * @chip: The NAND chip
+ * @page: parameter page to read
+ * @buf: buffer used to store the data
+ * @len: length of the buffer
+ *
+ * This function issues a READ PARAMETER PAGE operation.
+ * This function does not select/unselect the CS line.
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ */
+static int nand_read_param_page_op(struct nand_chip *chip, u8 page, void *buf,
+				   unsigned int len)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	unsigned int i;
+	u8 *p = buf;
+
+	if (len && !buf)
+		return -EINVAL;
+
+	chip->cmdfunc(mtd, NAND_CMD_PARAM, page, -1);
+	for (i = 0; i < len; i++)
+		p[i] = chip->read_byte(mtd);
+
+	return 0;
+}
+
+/**
+ * nand_change_read_column_op - Do a CHANGE READ COLUMN operation
+ * @chip: The NAND chip
+ * @offset_in_page: offset within the page
+ * @buf: buffer used to store the data
+ * @len: length of the buffer
+ * @force_8bit: force 8-bit bus access
+ *
+ * This function issues a CHANGE READ COLUMN operation.
+ * This function does not select/unselect the CS line.
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ */
+int nand_change_read_column_op(struct nand_chip *chip,
+			       unsigned int offset_in_page, void *buf,
+			       unsigned int len, bool force_8bit)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+
+	if (len && !buf)
+		return -EINVAL;
+
+	if (offset_in_page + len > mtd->writesize + mtd->oobsize)
+		return -EINVAL;
+
+	chip->cmdfunc(mtd, NAND_CMD_RNDOUT, offset_in_page, -1);
+	if (len)
+		chip->read_buf(mtd, buf, len);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(nand_change_read_column_op);
+
+/**
+ * nand_read_oob_op - Do a READ OOB operation
+ * @chip: The NAND chip
+ * @page: page to read
+ * @offset_in_oob: offset within the OOB area
+ * @buf: buffer used to store the data
+ * @len: length of the buffer
+ *
+ * This function issues a READ OOB operation.
+ * This function does not select/unselect the CS line.
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ */
+int nand_read_oob_op(struct nand_chip *chip, unsigned int page,
+		     unsigned int offset_in_oob, void *buf, unsigned int len)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+
+	if (len && !buf)
+		return -EINVAL;
+
+	if (offset_in_oob + len > mtd->oobsize)
+		return -EINVAL;
+
+	chip->cmdfunc(mtd, NAND_CMD_READOOB, offset_in_oob, page);
+	if (len)
+		chip->read_buf(mtd, buf, len);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(nand_read_oob_op);
+
+/**
+ * nand_prog_page_begin_op - starts a PROG PAGE operation
+ * @chip: The NAND chip
+ * @page: page to write
+ * @offset_in_page: offset within the page
+ * @buf: buffer containing the data to write to the page
+ * @len: length of the buffer
+ *
+ * This function issues the first half of a PROG PAGE operation.
+ * This function does not select/unselect the CS line.
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ */
+int nand_prog_page_begin_op(struct nand_chip *chip, unsigned int page,
+			    unsigned int offset_in_page, const void *buf,
+			    unsigned int len)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+
+	if (len && !buf)
+		return -EINVAL;
+
+	if (offset_in_page + len > mtd->writesize + mtd->oobsize)
+		return -EINVAL;
+
+	chip->cmdfunc(mtd, NAND_CMD_SEQIN, offset_in_page, page);
+
+	if (buf)
+		chip->write_buf(mtd, buf, len);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(nand_prog_page_begin_op);
+
+/**
+ * nand_prog_page_end_op - ends a PROG PAGE operation
+ * @chip: The NAND chip
+ *
+ * This function issues the second half of a PROG PAGE operation.
+ * This function does not select/unselect the CS line.
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ */
+int nand_prog_page_end_op(struct nand_chip *chip)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	int status;
+
+	chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
+
+	status = chip->waitfunc(mtd, chip);
+	if (status & NAND_STATUS_FAIL)
+		return -EIO;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(nand_prog_page_end_op);
+
+/**
+ * nand_prog_page_op - Do a full PROG PAGE operation
+ * @chip: The NAND chip
+ * @page: page to write
+ * @offset_in_page: offset within the page
+ * @buf: buffer containing the data to write to the page
+ * @len: length of the buffer
+ *
+ * This function issues a full PROG PAGE operation.
+ * This function does not select/unselect the CS line.
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ */
+int nand_prog_page_op(struct nand_chip *chip, unsigned int page,
+		      unsigned int offset_in_page, const void *buf,
+		      unsigned int len)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	int status;
+
+	if (!len || !buf)
+		return -EINVAL;
+
+	if (offset_in_page + len > mtd->writesize + mtd->oobsize)
+		return -EINVAL;
+
+	chip->cmdfunc(mtd, NAND_CMD_SEQIN, offset_in_page, page);
+	chip->write_buf(mtd, buf, len);
+	chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
+
+	status = chip->waitfunc(mtd, chip);
+	if (status & NAND_STATUS_FAIL)
+		return -EIO;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(nand_prog_page_op);
+
+/**
+ * nand_change_write_column_op - Do a CHANGE WRITE COLUMN operation
+ * @chip: The NAND chip
+ * @offset_in_page: offset within the page
+ * @buf: buffer containing the data to send to the NAND
+ * @len: length of the buffer
+ * @force_8bit: force 8-bit bus access
+ *
+ * This function issues a CHANGE WRITE COLUMN operation.
+ * This function does not select/unselect the CS line.
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ */
+int nand_change_write_column_op(struct nand_chip *chip,
+				unsigned int offset_in_page,
+				const void *buf, unsigned int len,
+				bool force_8bit)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+
+	if (len && !buf)
+		return -EINVAL;
+
+	if (offset_in_page + len > mtd->writesize + mtd->oobsize)
+		return -EINVAL;
+
+	chip->cmdfunc(mtd, NAND_CMD_RNDIN, offset_in_page, -1);
+	if (len)
+		chip->write_buf(mtd, buf, len);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(nand_change_write_column_op);
+
+/**
+ * nand_readid_op - Do a READID operation
+ * @chip: The NAND chip
+ * @addr: address cycle to pass after the READID command
+ * @buf: buffer used to store the ID
+ * @len: length of the buffer
+ *
+ * This function sends a READID command and reads back the ID returned by the
+ * NAND.
+ * This function does not select/unselect the CS line.
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ */
+int nand_readid_op(struct nand_chip *chip, u8 addr, void *buf,
+		   unsigned int len)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	unsigned int i;
+	u8 *id = buf;
+
+	if (len && !buf)
+		return -EINVAL;
+
+	chip->cmdfunc(mtd, NAND_CMD_READID, addr, -1);
+
+	for (i = 0; i < len; i++)
+		id[i] = chip->read_byte(mtd);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(nand_readid_op);
+
+/**
+ * nand_status_op - Do a STATUS operation
+ * @chip: The NAND chip
+ * @status: out variable to store the NAND status
+ *
+ * This function sends a STATUS command and reads back the status returned by
+ * the NAND.
+ * This function does not select/unselect the CS line.
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ */
+int nand_status_op(struct nand_chip *chip, u8 *status)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+
+	chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
+	if (status)
+		*status = chip->read_byte(mtd);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(nand_status_op);
+
+/**
+ * nand_exit_status_op - Exit a STATUS operation
+ * @chip: The NAND chip
+ *
+ * This function sends a READ0 command to cancel the effect of the STATUS
+ * command to avoid reading only the status until a new read command is sent.
+ *
+ * This function does not select/unselect the CS line.
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ */
+int nand_exit_status_op(struct nand_chip *chip)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+
+	chip->cmdfunc(mtd, NAND_CMD_READ0, -1, -1);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(nand_exit_status_op);
+
+/**
+ * nand_erase_op - Do an erase operation
+ * @chip: The NAND chip
+ * @eraseblock: block to erase
+ *
+ * This function sends an ERASE command and waits for the NAND to be ready
+ * before returning.
+ * This function does not select/unselect the CS line.
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ */
+int nand_erase_op(struct nand_chip *chip, unsigned int eraseblock)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	unsigned int page = eraseblock <<
+			    (chip->phys_erase_shift - chip->page_shift);
+	int status;
+
+	chip->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page);
+	chip->cmdfunc(mtd, NAND_CMD_ERASE2, -1, -1);
+
+	status = chip->waitfunc(mtd, chip);
+	if (status < 0)
+		return status;
+
+	if (status & NAND_STATUS_FAIL)
+		return -EIO;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(nand_erase_op);
+
+/**
+ * nand_set_features_op - Do a SET FEATURES operation
+ * @chip: The NAND chip
+ * @feature: feature id
+ * @data: 4 bytes of data
+ *
+ * This function sends a SET FEATURES command and waits for the NAND to be
+ * ready before returning.
+ * This function does not select/unselect the CS line.
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ */
+static int nand_set_features_op(struct nand_chip *chip, u8 feature,
+				const void *data)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	const u8 *params = data;
+	int i, status;
+
+	chip->cmdfunc(mtd, NAND_CMD_SET_FEATURES, feature, -1);
+	for (i = 0; i < ONFI_SUBFEATURE_PARAM_LEN; ++i)
+		chip->write_byte(mtd, params[i]);
+
+	status = chip->waitfunc(mtd, chip);
+	if (status & NAND_STATUS_FAIL)
+		return -EIO;
+
+	return 0;
+}
+
+/**
+ * nand_get_features_op - Do a GET FEATURES operation
+ * @chip: The NAND chip
+ * @feature: feature id
+ * @data: 4 bytes of data
+ *
+ * This function sends a GET FEATURES command and waits for the NAND to be
+ * ready before returning.
+ * This function does not select/unselect the CS line.
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ */
+static int nand_get_features_op(struct nand_chip *chip, u8 feature,
+				void *data)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	u8 *params = data;
+	int i;
+
+	chip->cmdfunc(mtd, NAND_CMD_GET_FEATURES, feature, -1);
+	for (i = 0; i < ONFI_SUBFEATURE_PARAM_LEN; ++i)
+		params[i] = chip->read_byte(mtd);
+
+	return 0;
+}
+
+/**
+ * nand_reset_op - Do a reset operation
+ * @chip: The NAND chip
+ *
+ * This function sends a RESET command and waits for the NAND to be ready
+ * before returning.
+ * This function does not select/unselect the CS line.
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ */
+int nand_reset_op(struct nand_chip *chip)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+
+	chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(nand_reset_op);
+
+/**
+ * nand_read_data_op - Read data from the NAND
+ * @chip: The NAND chip
+ * @buf: buffer used to store the data
+ * @len: length of the buffer
+ * @force_8bit: force 8-bit bus access
+ *
+ * This function does a raw data read on the bus. Usually used after launching
+ * another NAND operation like nand_read_page_op().
+ * This function does not select/unselect the CS line.
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ */
+int nand_read_data_op(struct nand_chip *chip, void *buf, unsigned int len,
+		      bool force_8bit)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+
+	if (!len || !buf)
+		return -EINVAL;
+
+	if (force_8bit) {
+		u8 *p = buf;
+		unsigned int i;
+
+		for (i = 0; i < len; i++)
+			p[i] = chip->read_byte(mtd);
+	} else {
+		chip->read_buf(mtd, buf, len);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(nand_read_data_op);
+
+/**
+ * nand_write_data_op - Write data from the NAND
+ * @chip: The NAND chip
+ * @buf: buffer containing the data to send on the bus
+ * @len: length of the buffer
+ * @force_8bit: force 8-bit bus access
+ *
+ * This function does a raw data write on the bus. Usually used after launching
+ * another NAND operation like nand_write_page_begin_op().
+ * This function does not select/unselect the CS line.
+ *
+ * Returns 0 on success, a negative error code otherwise.
+ */
+int nand_write_data_op(struct nand_chip *chip, const void *buf,
+		       unsigned int len, bool force_8bit)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+
+	if (!len || !buf)
+		return -EINVAL;
+
+	if (force_8bit) {
+		const u8 *p = buf;
+		unsigned int i;
+
+		for (i = 0; i < len; i++)
+			chip->write_byte(mtd, p[i]);
+	} else {
+		chip->write_buf(mtd, buf, len);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(nand_write_data_op);
+
+/**
  * nand_reset - Reset and initialize a NAND device
  * @chip: The NAND chip
  * @chipnr: Internal die id

@@ -1066,8 +1607,10 @@ int nand_reset(struct nand_chip *chip, int chipnr)
 	 * interface settings, hence this weird ->select_chip() dance.
 	 */
 	chip->select_chip(mtd, chipnr);
-	chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
+	ret = nand_reset_op(chip);
 	chip->select_chip(mtd, -1);
+	if (ret)
+		return ret;
 
 	chip->select_chip(mtd, chipnr);
 	ret = nand_setup_data_interface(chip, chipnr);

@@ -1218,9 +1761,19 @@ EXPORT_SYMBOL(nand_check_erased_ecc_chunk);
 static int nand_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
 			      uint8_t *buf, int oob_required, int page)
 {
-	chip->read_buf(mtd, buf, mtd->writesize);
-	if (oob_required)
-		chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
+	int ret;
+
+	ret = nand_read_data_op(chip, buf, mtd->writesize, false);
+	if (ret)
+		return ret;
+
+	if (oob_required) {
+		ret = nand_read_data_op(chip, chip->oob_poi, mtd->oobsize,
+					false);
+		if (ret)
+			return ret;
+	}
+
 	return 0;
 }
 

@@ -1241,29 +1794,46 @@ static int nand_read_page_raw_syndrome(struct mtd_info *mtd,
 	int eccsize = chip->ecc.size;
 	int eccbytes = chip->ecc.bytes;
 	uint8_t *oob = chip->oob_poi;
-	int steps, size;
+	int steps, size, ret;
 
 	for (steps = chip->ecc.steps; steps > 0; steps--) {
-		chip->read_buf(mtd, buf, eccsize);
+		ret = nand_read_data_op(chip, buf, eccsize, false);
+		if (ret)
+			return ret;
+
 		buf += eccsize;
 
 		if (chip->ecc.prepad) {
-			chip->read_buf(mtd, oob, chip->ecc.prepad);
+			ret = nand_read_data_op(chip, oob, chip->ecc.prepad,
+						false);
+			if (ret)
+				return ret;
+
 			oob += chip->ecc.prepad;
 		}
 
-		chip->read_buf(mtd, oob, eccbytes);
+		ret = nand_read_data_op(chip, oob, eccbytes, false);
+		if (ret)
+			return ret;
+
 		oob += eccbytes;
 
 		if (chip->ecc.postpad) {
-			chip->read_buf(mtd, oob, chip->ecc.postpad);
+			ret = nand_read_data_op(chip, oob, chip->ecc.postpad,
+						false);
+			if (ret)
+				return ret;
+
 			oob += chip->ecc.postpad;
 		}
 	}
 
 	size = mtd->oobsize - (oob - chip->oob_poi);
-	if (size)
-		chip->read_buf(mtd, oob, size);
+	if (size) {
+		ret = nand_read_data_op(chip, oob, size, false);
+		if (ret)
+			return ret;
+	}
 
 	return 0;
 }

@@ -1334,6 +1904,7 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 	int busw = (chip->options & NAND_BUSWIDTH_16) ? 2 : 1;
 	int index;
 	unsigned int max_bitflips = 0;
+	int ret;
 
 	/* Column address within the page aligned to ECC size (256bytes) */
 	start_step = data_offs / chip->ecc.size;

@@ -1351,7 +1922,9 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 		chip->cmdfunc(mtd, NAND_CMD_RNDOUT, data_col_addr, -1);
 
 	p = bufpoi + data_col_addr;
-	chip->read_buf(mtd, p, datafrag_len);
+	ret = nand_read_data_op(chip, p, datafrag_len, false);
+	if (ret)
+		return ret;
 
 	/* Calculate ECC */
 	for (i = 0; i < eccfrag_len ; i += chip->ecc.bytes, p += chip->ecc.size)

@@ -1368,8 +1941,11 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 		}
 	}
 	if (gaps) {
-		chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1);
-		chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
+		ret = nand_change_read_column_op(chip, mtd->writesize,
+						 chip->oob_poi, mtd->oobsize,
+						 false);
+		if (ret)
+			return ret;
 	} else {
 		/*
 		 * Send the command to read the particular ECC bytes take care

@@ -1382,9 +1958,12 @@ static int nand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 		if (eccpos[index + (num_steps * chip->ecc.bytes)] & (busw - 1))
 			aligned_len++;
 
-		chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
-					mtd->writesize + aligned_pos, -1);
-		chip->read_buf(mtd, &chip->oob_poi[aligned_pos], aligned_len);
+		ret = nand_change_read_column_op(chip,
+						 mtd->writesize + aligned_pos,
+						 &chip->oob_poi[aligned_pos],
+						 aligned_len, false);
+		if (ret)
+			return ret;
 	}
 
 	for (i = 0; i < eccfrag_len; i++)

@@ -1437,13 +2016,21 @@ static int nand_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 	uint8_t *ecc_code = chip->buffers->ecccode;
 	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	unsigned int max_bitflips = 0;
+	int ret;
 
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 		chip->ecc.hwctl(mtd, NAND_ECC_READ);
-		chip->read_buf(mtd, p, eccsize);
+
+		ret = nand_read_data_op(chip, p, eccsize, false);
+		if (ret)
+			return ret;
+
 		chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 	}
-	chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
+
+	ret = nand_read_data_op(chip, chip->oob_poi, mtd->oobsize, false);
+	if (ret)
+		return ret;
 
 	for (i = 0; i < chip->ecc.total; i++)
 		ecc_code[i] = chip->oob_poi[eccpos[i]];

@@ -1499,11 +2086,16 @@ static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
 	uint32_t *eccpos = chip->ecc.layout->eccpos;
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	unsigned int max_bitflips = 0;
+	int ret;
 
 	/* Read the OOB area first */
-	chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
-	chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
-	chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
+	ret = nand_read_oob_op(chip, page, 0, chip->oob_poi, mtd->oobsize);
+	if (ret)
+		return ret;
+
+	ret = nand_read_page_op(chip, page, 0, NULL, 0);
+	if (ret)
+		return ret;
 
 	for (i = 0; i < chip->ecc.total; i++)
 		ecc_code[i] = chip->oob_poi[eccpos[i]];

@@ -1512,7 +2104,11 @@ static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
 		int stat;
 
 		chip->ecc.hwctl(mtd, NAND_ECC_READ);
-		chip->read_buf(mtd, p, eccsize);
+
+		ret = nand_read_data_op(chip, p, eccsize, false);
+		if (ret)
+			return ret;
+
 		chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 
 		stat = chip->ecc.correct(mtd, p, &ecc_code[i], NULL);

@@ -1549,7 +2145,7 @@ static int nand_read_page_hwecc_oob_first(struct mtd_info *mtd,
 static int nand_read_page_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
 				   uint8_t *buf, int oob_required, int page)
 {
-	int i, eccsize = chip->ecc.size;
+	int ret, i, eccsize = chip->ecc.size;
 	int eccbytes = chip->ecc.bytes;
 	int eccsteps = chip->ecc.steps;
 	int eccpadbytes = eccbytes + chip->ecc.prepad + chip->ecc.postpad;

@@ -1561,21 +2157,36 @@ static int nand_read_page_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
 		int stat;
 
 		chip->ecc.hwctl(mtd, NAND_ECC_READ);
-		chip->read_buf(mtd, p, eccsize);
+
+		ret = nand_read_data_op(chip, p, eccsize, false);
+		if (ret)
+			return ret;
 
 		if (chip->ecc.prepad) {
-			chip->read_buf(mtd, oob, chip->ecc.prepad);
+			ret = nand_read_data_op(chip, oob, chip->ecc.prepad,
+						false);
+			if (ret)
+				return ret;
+
 			oob += chip->ecc.prepad;
 		}
 
 		chip->ecc.hwctl(mtd, NAND_ECC_READSYN);
-		chip->read_buf(mtd, oob, eccbytes);
+
+		ret = nand_read_data_op(chip, oob, eccbytes, false);
+		if (ret)
+			return ret;
+
 		stat = chip->ecc.correct(mtd, p, oob, NULL);
 
 		oob += eccbytes;
 
 		if (chip->ecc.postpad) {
-			chip->read_buf(mtd, oob, chip->ecc.postpad);
+			ret = nand_read_data_op(chip, oob, chip->ecc.postpad,
+						false);
+			if (ret)
+				return ret;
+
 			oob += chip->ecc.postpad;
 		}
 

@@ -1599,8 +2210,11 @@ static int nand_read_page_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
 
 	/* Calculate remaining oob bytes */
 	i = mtd->oobsize - (oob - chip->oob_poi);
-	if (i)
-		chip->read_buf(mtd, oob, i);
+	if (i) {
+		ret = nand_read_data_op(chip, oob, i, false);
+		if (ret)
+			return ret;
+	}
 
 	return max_bitflips;
 }

@@ -1737,8 +2351,11 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from,
 						 __func__, buf);
 
 read_retry:
-			if (nand_standard_page_accessors(&chip->ecc))
-				chip->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page);
+			if (nand_standard_page_accessors(&chip->ecc)) {
+				ret = nand_read_page_op(chip, page, 0, NULL, 0);
+				if (ret)
+					break;
+			}
 
 			/*
 			 * Now read the page into the buffer.  Absent an error,

@@ -1872,9 +2489,7 @@ read_retry:
 static int nand_read_oob_std(struct mtd_info *mtd, struct nand_chip *chip,
 			     int page)
 {
-	chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
-	chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
-	return 0;
+	return nand_read_oob_op(chip, page, 0, chip->oob_poi, mtd->oobsize);
 }
 
 /**

@@ -1891,25 +2506,43 @@ static int nand_read_oob_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
 	int chunk = chip->ecc.bytes + chip->ecc.prepad + chip->ecc.postpad;
 	int eccsize = chip->ecc.size;
 	uint8_t *bufpoi = chip->oob_poi;
-	int i, toread, sndrnd = 0, pos;
+	int i, toread, sndrnd = 0, pos, ret;
+
+	ret = nand_read_page_op(chip, page, chip->ecc.size, NULL, 0);
+	if (ret)
+		return ret;
 
-	chip->cmdfunc(mtd, NAND_CMD_READ0, chip->ecc.size, page);
 	for (i = 0; i < chip->ecc.steps; i++) {
 		if (sndrnd) {
+			int ret;
+
 			pos = eccsize + i * (eccsize + chunk);
 			if (mtd->writesize > 512)
-				chip->cmdfunc(mtd, NAND_CMD_RNDOUT, pos, -1);
+				ret = nand_change_read_column_op(chip, pos,
+								 NULL, 0,
+								 false);
 			else
-				chip->cmdfunc(mtd, NAND_CMD_READ0, pos, page);
+				ret = nand_read_page_op(chip, page, pos, NULL,
+							0);
+
+			if (ret)
+				return ret;
 		} else
 			sndrnd = 1;
 		toread = min_t(int, length, chunk);
-		chip->read_buf(mtd, bufpoi, toread);
+
+		ret = nand_read_data_op(chip, bufpoi, toread, false);
+		if (ret)
+			return ret;
+
 		bufpoi += toread;
 		length -= toread;
 	}
-	if (length > 0)
-		chip->read_buf(mtd, bufpoi, length);
+	if (length > 0) {
+		ret = nand_read_data_op(chip, bufpoi, length, false);
+		if (ret)
+			return ret;
+	}
 
 	return 0;
 }

@@ -1923,18 +2556,8 @@ static int nand_read_oob_syndrome(struct mtd_info *mtd, struct nand_chip *chip,
 static int nand_write_oob_std(struct mtd_info *mtd, struct nand_chip *chip,
 			      int page)
 {
-	int status = 0;
-	const uint8_t *buf = chip->oob_poi;
-	int length = mtd->oobsize;
-
-	chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize, page);
-	chip->write_buf(mtd, buf, length);
-	/* Send command to program the OOB data */
-	chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
-
-	status = chip->waitfunc(mtd, chip);
-
-	return status & NAND_STATUS_FAIL ? -EIO : 0;
+	return nand_prog_page_op(chip, page, mtd->writesize, chip->oob_poi,
+				 mtd->oobsize);
 }
 
 /**

@@ -1949,7 +2572,7 @@ static int nand_write_oob_syndrome(struct mtd_info *mtd,
 {
 	int chunk = chip->ecc.bytes + chip->ecc.prepad + chip->ecc.postpad;
 	int eccsize = chip->ecc.size, length = mtd->oobsize;
-	int i, len, pos, status = 0, sndcmd = 0, steps = chip->ecc.steps;
+	int ret, i, len, pos, sndcmd = 0, steps = chip->ecc.steps;
 	const uint8_t *bufpoi = chip->oob_poi;
 
 	/*

@@ -1963,7 +2586,10 @@ static int nand_write_oob_syndrome(struct mtd_info *mtd,
 	} else
 		pos = eccsize;
 
-	chip->cmdfunc(mtd, NAND_CMD_SEQIN, pos, page);
+	ret = nand_prog_page_begin_op(chip, page, pos, NULL, 0);
+	if (ret)
+		return ret;
+
 	for (i = 0; i < steps; i++) {
 		if (sndcmd) {
 			if (mtd->writesize <= 512) {

@@ -1972,28 +2598,40 @@ static int nand_write_oob_syndrome(struct mtd_info *mtd,
 				len = eccsize;
 				while (len > 0) {
 					int num = min_t(int, len, 4);
-					chip->write_buf(mtd, (uint8_t *)&fill,
-							num);
+
+					ret = nand_write_data_op(chip, &fill,
+								 num, false);
+					if (ret)
+						return ret;
+
 					len -= num;
 				}
 			} else {
 				pos = eccsize + i * (eccsize + chunk);
-				chip->cmdfunc(mtd, NAND_CMD_RNDIN, pos, -1);
+				ret = nand_change_write_column_op(chip, pos,
+								  NULL, 0,
+								  false);
+				if (ret)
+					return ret;
 			}
 		} else
 			sndcmd = 1;
 		len = min_t(int, length, chunk);
-		chip->write_buf(mtd, bufpoi, len);
+
+		ret = nand_write_data_op(chip, bufpoi, len, false);
+		if (ret)
+			return ret;
+
 		bufpoi += len;
 		length -= len;
 	}
-	if (length > 0)
-		chip->write_buf(mtd, bufpoi, length);
-
-	chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
-	status = chip->waitfunc(mtd, chip);
+	if (length > 0) {
+		ret = nand_write_data_op(chip, bufpoi, length, false);
+		if (ret)
+			return ret;
+	}
 
-	return status & NAND_STATUS_FAIL ? -EIO : 0;
+	return nand_prog_page_end_op(chip);
 }
 
 /**

@@ -2152,9 +2790,18 @@ out:
 static int nand_write_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
 			       const uint8_t *buf, int oob_required, int page)
 {
-	chip->write_buf(mtd, buf, mtd->writesize);
-	if (oob_required)
-		chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
+	int ret;
+
+	ret = nand_write_data_op(chip, buf, mtd->writesize, false);
+	if (ret)
+		return ret;
+
+	if (oob_required) {
+		ret = nand_write_data_op(chip, chip->oob_poi, mtd->oobsize,
+					 false);
+		if (ret)
+			return ret;
+	}
 
 	return 0;
 }

@@ -2177,29 +2824,46 @@ static int nand_write_page_raw_syndrome(struct mtd_info *mtd,
 	int eccsize = chip->ecc.size;
 	int eccbytes = chip->ecc.bytes;
 	uint8_t *oob = chip->oob_poi;
-	int steps, size;
+	int steps, size, ret;
 
 	for (steps = chip->ecc.steps; steps > 0; steps--) {
-		chip->write_buf(mtd, buf, eccsize);
+		ret = nand_write_data_op(chip, buf, eccsize, false);
+		if (ret)
+			return ret;
+
 		buf += eccsize;
 
 		if (chip->ecc.prepad) {
-			chip->write_buf(mtd, oob, chip->ecc.prepad);
+			ret = nand_write_data_op(chip, oob, chip->ecc.prepad,
+						 false);
+			if (ret)
+				return ret;
+
 			oob += chip->ecc.prepad;
 		}
 
-		chip->write_buf(mtd, oob, eccbytes);
+		ret = nand_write_data_op(chip, oob, eccbytes, false);
+		if (ret)
+			return ret;
+
 		oob += eccbytes;
 
 		if (chip->ecc.postpad) {
-			chip->write_buf(mtd, oob, chip->ecc.postpad);
+			ret = nand_write_data_op(chip, oob, chip->ecc.postpad,
+						 false);
+			if (ret)
+				return ret;
+
 			oob += chip->ecc.postpad;
 		}
 	}
 
 	size = mtd->oobsize - (oob - chip->oob_poi);
-	if (size)
-		chip->write_buf(mtd, oob, size);
+	if (size) {
+		ret = nand_write_data_op(chip, oob, size, false);
+		if (ret)
+			return ret;
+	}
 
 	return 0;
 }

@@ -2250,17 +2914,24 @@ static int nand_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
 	uint8_t *ecc_calc = chip->buffers->ecccalc;
 	const uint8_t *p = buf;
 	uint32_t *eccpos = chip->ecc.layout->eccpos;
+	int ret;
 
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
 		chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
-		chip->write_buf(mtd, p, eccsize);
+
+		ret = nand_write_data_op(chip, p, eccsize, false);
+		if (ret)
+			return ret;
+
 		chip->ecc.calculate(mtd, p, &ecc_calc[i]);
 	}
 
 	for (i = 0; i < chip->ecc.total; i++)
 		chip->oob_poi[eccpos[i]] = ecc_calc[i];
 
-	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
+	ret = nand_write_data_op(chip, chip->oob_poi, mtd->oobsize, false);
+	if (ret)
+		return ret;
 
 	return 0;
 }

@@ -2291,13 +2962,16 @@ static int nand_write_subpage_hwecc(struct mtd_info *mtd,
 	uint32_t end_step   = (offset + data_len - 1) / ecc_size;
 	int oob_bytes       = mtd->oobsize / ecc_steps;
 	int step, i;
+	int ret;
 
 	for (step = 0; step < ecc_steps; step++) {
 		/* configure controller for WRITE access */
 		chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
 
 		/* write data (untouched subpages already masked by 0xFF) */
-		chip->write_buf(mtd, buf, ecc_size);
+		ret = nand_write_data_op(chip, buf, ecc_size, false);
+		if (ret)
+			return ret;
 
 		/* mask ECC of un-touched subpages by padding 0xFF */
 		if ((step < start_step) || (step > end_step))

@@ -2322,7 +2996,9 @@ static int nand_write_subpage_hwecc(struct mtd_info *mtd,
 		chip->oob_poi[eccpos[i]] = ecc_calc[i];
 
 	/* write OOB buffer to NAND device */
-	chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
+	ret = nand_write_data_op(chip, chip->oob_poi, mtd->oobsize, false);
+	if (ret)
+		return ret;
 
 	return 0;
 }

@@ -2349,31 +3025,49 @@ static int nand_write_page_syndrome(struct mtd_info *mtd,
 	int eccsteps = chip->ecc.steps;
 	const uint8_t *p = buf;
 	uint8_t *oob = chip->oob_poi;
+	int ret;
 
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
-
 		chip->ecc.hwctl(mtd, NAND_ECC_WRITE);
-		chip->write_buf(mtd, p, eccsize);
+
+		ret = nand_write_data_op(chip, p, eccsize, false);
+		if (ret)
+			return ret;
 
 		if (chip->ecc.prepad) {
-			chip->write_buf(mtd, oob, chip->ecc.prepad);
+			ret = nand_write_data_op(chip, oob, chip->ecc.prepad,
+						 false);
+			if (ret)
+				return ret;
+
 			oob += chip->ecc.prepad;
 		}
 
 		chip->ecc.calculate(mtd, p, oob);
-		chip->write_buf(mtd, oob, eccbytes);
+
+		ret = nand_write_data_op(chip, oob, eccbytes, false);
+		if (ret)
+			return ret;
+
 		oob += eccbytes;
 
 		if (chip->ecc.postpad) {
-			chip->write_buf(mtd, oob, chip->ecc.postpad);
+			ret = nand_write_data_op(chip, oob, chip->ecc.postpad,
+						 false);
+			if (ret)
+				return ret;
+
 			oob += chip->ecc.postpad;
 		}
 	}
 
 	/* Calculate remaining oob bytes */
 	i = mtd->oobsize - (oob - chip->oob_poi);
-	if (i)
-		chip->write_buf(mtd, oob, i);
+	if (i) {
+		ret = nand_write_data_op(chip, oob, i, false);
+		if (ret)
+			return ret;
+	}
 
 	return 0;
 }

@@ -2401,8 +3095,11 @@ static int nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
 	else
 		subpage = 0;
 
-	if (nand_standard_page_accessors(&chip->ecc))
-		chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
+	if (nand_standard_page_accessors(&chip->ecc)) {
+		status = nand_prog_page_begin_op(chip, page, 0, NULL, 0);
+		if (status)
+			return status;
+	}
 
 	if (unlikely(raw))
 		status = chip->ecc.write_page_raw(mtd, chip, buf,

@@ -2417,13 +3114,8 @@ static int nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
 	if (status < 0)
 		return status;
 
-	if (nand_standard_page_accessors(&chip->ecc)) {
-		chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
-
-		status = chip->waitfunc(mtd, chip);
-		if (status & NAND_STATUS_FAIL)
-			return -EIO;
-	}
+	if (nand_standard_page_accessors(&chip->ecc))
+		return nand_prog_page_end_op(chip);
 
 	return 0;
 }

@@ -2783,11 +3475,12 @@ out:
 static int single_erase(struct mtd_info *mtd, int page)
 {
 	struct nand_chip *chip = mtd_to_nand(mtd);
+	unsigned int eraseblock;
+
 	/* Send commands to erase a block */
-	chip->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page);
-	chip->cmdfunc(mtd, NAND_CMD_ERASE2, -1, -1);
+	eraseblock = page >> (chip->phys_erase_shift - chip->page_shift);
 
-	return chip->waitfunc(mtd, chip);
+	return nand_erase_op(chip, eraseblock);
 }
 
 /**

@@ -2980,9 +3673,6 @@ static int nand_block_markbad(struct mtd_info *mtd, loff_t ofs)
 static int nand_onfi_set_features(struct mtd_info *mtd, struct nand_chip *chip,
 			int addr, uint8_t *subfeature_param)
 {
-	int status;
-	int i;
-
 #ifdef CONFIG_SYS_NAND_ONFI_DETECTION
 	if (!chip->onfi_version ||
 	    !(le16_to_cpu(chip->onfi_params.opt_cmd)

@@ -2990,14 +3680,7 @@ static int nand_onfi_set_features(struct mtd_info *mtd, struct nand_chip *chip,
 		return -ENOTSUPP;
 #endif
 
-	chip->cmdfunc(mtd, NAND_CMD_SET_FEATURES, addr, -1);
-	for (i = 0; i < ONFI_SUBFEATURE_PARAM_LEN; ++i)
-		chip->write_byte(mtd, subfeature_param[i]);
-
-	status = chip->waitfunc(mtd, chip);
-	if (status & NAND_STATUS_FAIL)
-		return -EIO;
-	return 0;
+	return nand_set_features_op(chip, addr, subfeature_param);
 }
 
 /**

@@ -3010,8 +3693,6 @@ static int nand_onfi_set_features(struct mtd_info *mtd, struct nand_chip *chip,
 static int nand_onfi_get_features(struct mtd_info *mtd, struct nand_chip *chip,
 			int addr, uint8_t *subfeature_param)
 {
-	int i;
-
 #ifdef CONFIG_SYS_NAND_ONFI_DETECTION
 	if (!chip->onfi_version ||
 	    !(le16_to_cpu(chip->onfi_params.opt_cmd)

@@ -3019,10 +3700,7 @@ static int nand_onfi_get_features(struct mtd_info *mtd, struct nand_chip *chip,
 		return -ENOTSUPP;
 #endif
 
-	chip->cmdfunc(mtd, NAND_CMD_GET_FEATURES, addr, -1);
-	for (i = 0; i < ONFI_SUBFEATURE_PARAM_LEN; ++i)
-		*subfeature_param++ = chip->read_byte(mtd);
-	return 0;
+	return nand_get_features_op(chip, addr, subfeature_param);
 }
 
 /* Set default functions */

@@ -3116,7 +3794,7 @@ static int nand_flash_detect_ext_param_page(struct mtd_info *mtd,
 	struct onfi_ext_section *s;
 	struct onfi_ext_ecc_info *ecc;
 	uint8_t *cursor;
-	int ret = -EINVAL;
+	int ret;
 	int len;
 	int i;
 

@@ -3126,14 +3804,18 @@ static int nand_flash_detect_ext_param_page(struct mtd_info *mtd,
 		return -ENOMEM;
 
 	/* Send our own NAND_CMD_PARAM. */
-	chip->cmdfunc(mtd, NAND_CMD_PARAM, 0, -1);
+	ret = nand_read_param_page_op(chip, 0, NULL, 0);
+	if (ret)
+		goto ext_out;
 
 	/* Use the Change Read Column command to skip the ONFI param pages. */
-	chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
-			sizeof(*p) * p->num_of_param_pages , -1);
+	ret = nand_change_read_column_op(chip,
+					 sizeof(*p) * p->num_of_param_pages,
+					 ep, len, true);
+	if (ret)
+		goto ext_out;
 
-	/* Read out the Extended Parameter Page. */
-	chip->read_buf(mtd, (uint8_t *)ep, len);
+	ret = -EINVAL;
 	if ((onfi_crc16(ONFI_CRC_BASE, ((uint8_t *)ep) + 2, len - 2)
 		!= le16_to_cpu(ep->crc))) {
 		pr_debug("fail in the CRC.\n");

@@ -3210,19 +3892,23 @@ static int nand_flash_detect_onfi(struct mtd_info *mtd, struct nand_chip *chip,
 					int *busw)
 {
 	struct nand_onfi_params *p = &chip->onfi_params;
-	int i, j;
-	int val;
+	char id[4];
+	int i, ret, val;
 
 	/* Try ONFI for unknown chip or LP */
-	chip->cmdfunc(mtd, NAND_CMD_READID, 0x20, -1);
-	if (chip->read_byte(mtd) != 'O' || chip->read_byte(mtd) != 'N' ||
-		chip->read_byte(mtd) != 'F' || chip->read_byte(mtd) != 'I')
+	ret = nand_readid_op(chip, 0x20, id, sizeof(id));
+	if (ret || strncmp(id, "ONFI", 4))
+		return 0;
+
+	ret = nand_read_param_page_op(chip, 0, NULL, 0);
+	if (ret)
 		return 0;
 
-	chip->cmdfunc(mtd, NAND_CMD_PARAM, 0, -1);
 	for (i = 0; i < 3; i++) {
-		for (j = 0; j < sizeof(*p); j++)
-			((uint8_t *)p)[j] = chip->read_byte(mtd);
+		ret = nand_read_data_op(chip, p, sizeof(*p), true);
+		if (ret)
+			return 0;
+
 		if (onfi_crc16(ONFI_CRC_BASE, (uint8_t *)p, 254) ==
 				le16_to_cpu(p->crc)) {
 			break;

@@ -3322,20 +4008,22 @@ static int nand_flash_detect_jedec(struct mtd_info *mtd, struct nand_chip *chip,
 {
 	struct nand_jedec_params *p = &chip->jedec_params;
 	struct jedec_ecc_info *ecc;
-	int val;
-	int i, j;
+	char id[5];
+	int i, val, ret;
 
 	/* Try JEDEC for unknown chip or LP */
-	chip->cmdfunc(mtd, NAND_CMD_READID, 0x40, -1);
-	if (chip->read_byte(mtd) != 'J' || chip->read_byte(mtd) != 'E' ||
-		chip->read_byte(mtd) != 'D' || chip->read_byte(mtd) != 'E' ||
-		chip->read_byte(mtd) != 'C')
+	ret = nand_readid_op(chip, 0x40, id, sizeof(id));
+	if (ret || strncmp(id, "JEDEC", sizeof(id)))
+		return 0;
+
+	ret = nand_read_param_page_op(chip, 0x40, NULL, 0);
+	if (ret)
 		return 0;
 
-	chip->cmdfunc(mtd, NAND_CMD_PARAM, 0x40, -1);
 	for (i = 0; i < 3; i++) {
-		for (j = 0; j < sizeof(*p); j++)
-			((uint8_t *)p)[j] = chip->read_byte(mtd);
+		ret = nand_read_data_op(chip, p, sizeof(*p), true);
+		if (ret)
+			return 0;
 
 		if (onfi_crc16(ONFI_CRC_BASE, (uint8_t *)p, 510) ==
 				le16_to_cpu(p->crc))

@@ -3706,25 +4394,29 @@ struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
 						  int *maf_id, int *dev_id,
 						  struct nand_flash_dev *type)
 {
-	int busw;
-	int i, maf_idx;
+	int busw, ret;
+	int maf_idx;
 	u8 id_data[8];
 
 	/*
 	 * Reset the chip, required by some chips (e.g. Micron MT29FxGxxxxx)
 	 * after power-up.
 	 */
-	nand_reset(chip, 0);
+	ret = nand_reset(chip, 0);
+	if (ret)
+		return ERR_PTR(ret);
 
 	/* Select the device */
 	chip->select_chip(mtd, 0);
 
 	/* Send the command for reading device ID */
-	chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
+	ret = nand_readid_op(chip, 0, id_data, 2);
+	if (ret)
+		return ERR_PTR(ret);
 
 	/* Read manufacturer and device IDs */
-	*maf_id = chip->read_byte(mtd);
-	*dev_id = chip->read_byte(mtd);
+	*maf_id = id_data[0];
+	*dev_id = id_data[1];
 
 	/*
 	 * Try again to make sure, as some systems the bus-hold or other

@@ -3733,11 +4425,10 @@ struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd,
 	 * not match, ignore the device completely.
 	 */
 
-	chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
-
 	/* Read entire ID string */
-	for (i = 0; i < 8; i++)
-		id_data[i] = chip->read_byte(mtd);
+	ret = nand_readid_op(chip, 0, id_data, 8);
+	if (ret)
+		return ERR_PTR(ret);
 
 	if (id_data[0] != *maf_id || id_data[1] != *dev_id) {
 		pr_info("second ID read did not match %02x,%02x against %02x,%02x\n",

@@ -3997,15 +4688,17 @@ int nand_scan_ident(struct mtd_info *mtd, int maxchips,
 
 	/* Check for a chip array */
 	for (i = 1; i < maxchips; i++) {
+		u8 id[2];
+
 		/* See comment in nand_get_flash_type for reset */
 		nand_reset(chip, i);
 
 		chip->select_chip(mtd, i);
 		/* Send the command for reading device ID */
-		chip->cmdfunc(mtd, NAND_CMD_READID, 0x00, -1);
+		nand_readid_op(chip, 0, id, sizeof(id));
+
 		/* Read manufacturer and device IDs */
-		if (nand_maf_id != chip->read_byte(mtd) ||
-		    nand_dev_id != chip->read_byte(mtd)) {
+		if (nand_maf_id != id[0] || nand_dev_id != id[1]) {
 			chip->select_chip(mtd, -1);
 			break;
 		}

index 96b5847..bd373b9 100644
@@ -1299,4 +1299,34 @@ int nand_maximize_ecc(struct nand_chip *chip,
 
 /* Reset and initialize a NAND device */
 int nand_reset(struct nand_chip *chip, int chipnr);
+
+/* NAND operation helpers */
+int nand_reset_op(struct nand_chip *chip);
+int nand_readid_op(struct nand_chip *chip, u8 addr, void *buf,
+		   unsigned int len);
+int nand_status_op(struct nand_chip *chip, u8 *status);
+int nand_exit_status_op(struct nand_chip *chip);
+int nand_erase_op(struct nand_chip *chip, unsigned int eraseblock);
+int nand_read_page_op(struct nand_chip *chip, unsigned int page,
+		      unsigned int offset_in_page, void *buf, unsigned int len);
+int nand_change_read_column_op(struct nand_chip *chip,
+			       unsigned int offset_in_page, void *buf,
+			       unsigned int len, bool force_8bit);
+int nand_read_oob_op(struct nand_chip *chip, unsigned int page,
+		     unsigned int offset_in_page, void *buf, unsigned int len);
+int nand_prog_page_begin_op(struct nand_chip *chip, unsigned int page,
+			    unsigned int offset_in_page, const void *buf,
+			    unsigned int len);
+int nand_prog_page_end_op(struct nand_chip *chip);
+int nand_prog_page_op(struct nand_chip *chip, unsigned int page,
+		      unsigned int offset_in_page, const void *buf,
+		      unsigned int len);
+int nand_change_write_column_op(struct nand_chip *chip,
+				unsigned int offset_in_page, const void *buf,
+				unsigned int len, bool force_8bit);
+int nand_read_data_op(struct nand_chip *chip, void *buf, unsigned int len,
+		      bool force_8bit);
+int nand_write_data_op(struct nand_chip *chip, const void *buf,
+		       unsigned int len, bool force_8bit);
+
 #endif /* __LINUX_MTD_RAWNAND_H */

index 5df7472..ab6bc59 100644
@@ -123,6 +123,21 @@ static inline void __raw_readsl(unsigned long addr, void *data, int longlen)
 #define readq(c)	({ u64 __v = __arch_getq(c); __iormb(); __v; })
 
 /*
+ * Relaxed I/O memory access primitives. These follow the Device memory
+ * ordering rules but do not guarantee any ordering relative to Normal memory
+ * accesses.
+ */
+#define readb_relaxed(c)        ({ u8  __r = __raw_readb(c); __r; })
+#define readw_relaxed(c)        ({ u16 __r = le16_to_cpu((__force __le16)__raw_readw(c)); __r; })
+#define readl_relaxed(c)        ({ u32 __r = le32_to_cpu((__force __le32)__raw_readl(c)); __r; })
+#define readq_relaxed(c)        ({ u64 __r = le64_to_cpu((__force __le64)__raw_readq(c)); __r; })
+
+#define writeb_relaxed(v,c)     ((void)__raw_writeb((v),(c)))
+#define writew_relaxed(v,c)     ((void)__raw_writew((__force u16)cpu_to_le16(v),(c)))
+#define writel_relaxed(v,c)     ((void)__raw_writel((__force u32)cpu_to_le32(v),(c)))
+#define writeq_relaxed(v,c)     ((void)__raw_writeq((__force u64)cpu_to_le64(v),(c)))
+
+/*
  * The compiler seems to be incapable of optimising constants
  * properly.  Spell it out to the compiler in some cases.
  * These are only valid for small values of "off" (< 1<<12)

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index 5a53cb9..b156642 100644
@@ -113,6 +113,7 @@ struct brcmnand_controller {
 	unsigned int		irq;
 	unsigned int		dma_irq;
 	int			nand_version;
+	int			parameter_page_big_endian;
 
 	/* Some SoCs provide custom interrupt status register(s) */
 	struct brcmnand_soc	*soc;

@@ -1446,7 +1447,10 @@ static void brcmnand_cmdfunc(struct mtd_info *mtd, unsigned command,
 			 * Flash cache is big endian for parameter pages, at
 			 * least on STB SoCs
 			 */
-			flash_cache[i] = be32_to_cpu(brcmnand_read_fc(ctrl, i));
+			if (ctrl->parameter_page_big_endian)
+				flash_cache[i] = be32_to_cpu(brcmnand_read_fc(ctrl, i));
+			else
+				flash_cache[i] = le32_to_cpu(brcmnand_read_fc(ctrl, i));
 
 		brcmnand_soc_data_bus_unprepare(ctrl->soc, true);
 

@@ -2554,6 +2558,9 @@ int brcmnand_probe(struct udevice *dev, struct brcmnand_soc *soc)
 	nand_hw_control_init(&ctrl->controller);
 	INIT_LIST_HEAD(&ctrl->host_list);
 
+	/* Is parameter page in big endian ? */
+	ctrl->parameter_page_big_endian = dev_read_u32_default(dev, "parameter-page-big-endian", 1);
+
 	/* NAND register range */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	ctrl->nand_base = devm_ioremap_resource(dev, res);

index b156642..3f9d510 100644
@@ -2650,6 +2650,9 @@ int brcmnand_probe(struct udevice *dev, struct brcmnand_soc *soc)
 	/* Disable XOR addressing */
 	brcmnand_rmw_reg(ctrl, BRCMNAND_CS_XOR, 0xff, 0, 0);
 
+	/* Read the write-protect configuration in the device tree */
+	wp_on = dev_read_u32_default(dev, "write-protect", wp_on);
+
 	if (ctrl->features & BRCMNAND_HAS_WP) {
 		/* Permanently disable write protection */
 		if (wp_on == 2)