Merge branch 'master' of https://gitlab.denx.de/u-boot/custodians/u-boot-spi

- fix mvebu_a3700_spi clock prescale (Marek Behún)
- unmark MXS_SPI, DEPRECATED (Lukasz)
- add spi_write_then_read (Jagan)
- fix SST26* flash ICs (Eugeniy)
- fix soft_spi data abort (Christophe)

13 files changed, 253 insertions, 93 deletions

diff --git a/doc/driver-model/migration.rst b/doc/driver-model/migration.rst
index 75b85235ef..fd499fb74a 100644
--- a/doc/driver-model/migration.rst
+++ b/doc/driver-model/migration.rst
@@ -58,10 +58,8 @@ to move the migration with in the deadline.
 
 No dm conversion yet::
 
-	drivers/spi/cf_spi.c
 	drivers/spi/fsl_espi.c
 	drivers/spi/lpc32xx_ssp.c
-	drivers/spi/mxs_spi.c
 	drivers/spi/sh_spi.c
 	drivers/spi/soft_spi_legacy.c
 
@@ -74,6 +72,7 @@ Partially converted::
 	drivers/spi/fsl_dspi.c
 	drivers/spi/kirkwood_spi.c
 	drivers/spi/mxc_spi.c
+	drivers/spi/mxs_spi.c
 	drivers/spi/omap3_spi.c
 	drivers/spi/sh_qspi.c
 
diff --git a/drivers/mtd/spi/Makefile b/drivers/mtd/spi/Makefile
index f99f6cb16e..20db1015d9 100644
--- a/drivers/mtd/spi/Makefile
+++ b/drivers/mtd/spi/Makefile
@@ -18,6 +18,6 @@ spi-nor-y += spi-nor-core.o
 endif
 
 obj-$(CONFIG_SPI_FLASH) += spi-nor.o
-obj-$(CONFIG_SPI_FLASH_DATAFLASH) += sf_dataflash.o sf.o
+obj-$(CONFIG_SPI_FLASH_DATAFLASH) += sf_dataflash.o
 obj-$(CONFIG_SPI_FLASH_MTD) += sf_mtd.o
 obj-$(CONFIG_SPI_FLASH_SANDBOX) += sandbox.o
diff --git a/drivers/mtd/spi/sf.c b/drivers/mtd/spi/sf.c
deleted file mode 100644
index ee3cf8b759..0000000000
--- a/drivers/mtd/spi/sf.c
+++ /dev/null
@@ -1,53 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * SPI flash interface
- *
- * Copyright (C) 2008 Atmel Corporation
- * Copyright (C) 2010 Reinhard Meyer, EMK Elektronik
- */
-
-#include <common.h>
-#include <spi.h>
-
-static int spi_flash_read_write(struct spi_slave *spi,
-				const u8 *cmd, size_t cmd_len,
-				const u8 *data_out, u8 *data_in,
-				size_t data_len)
-{
-	unsigned long flags = SPI_XFER_BEGIN;
-	int ret;
-
-	if (data_len == 0)
-		flags |= SPI_XFER_END;
-
-	ret = spi_xfer(spi, cmd_len * 8, cmd, NULL, flags);
-	if (ret) {
-		debug("SF: Failed to send command (%zu bytes): %d\n",
-		      cmd_len, ret);
-	} else if (data_len != 0) {
-		ret = spi_xfer(spi, data_len * 8, data_out, data_in,
-					SPI_XFER_END);
-		if (ret)
-			debug("SF: Failed to transfer %zu bytes of data: %d\n",
-			      data_len, ret);
-	}
-
-	return ret;
-}
-
-int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd,
-		size_t cmd_len, void *data, size_t data_len)
-{
-	return spi_flash_read_write(spi, cmd, cmd_len, NULL, data, data_len);
-}
-
-int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len)
-{
-	return spi_flash_cmd_read(spi, &cmd, 1, response, len);
-}
-
-int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len,
-		const void *data, size_t data_len)
-{
-	return spi_flash_read_write(spi, cmd, cmd_len, data, NULL, data_len);
-}
diff --git a/drivers/mtd/spi/sf_dataflash.c b/drivers/mtd/spi/sf_dataflash.c
index b6a2631747..55fb4bd31a 100644
--- a/drivers/mtd/spi/sf_dataflash.c
+++ b/drivers/mtd/spi/sf_dataflash.c
@@ -76,12 +76,14 @@ struct dataflash {
 static inline int dataflash_status(struct spi_slave *spi)
 {
 	int ret;
+	u8 opcode = OP_READ_STATUS;
 	u8 status;
+
 	/*
 	 * NOTE:  at45db321c over 25 MHz wants to write
 	 * a dummy byte after the opcode...
 	 */
-	ret = spi_flash_cmd(spi, OP_READ_STATUS, &status, 1);
+	ret =  spi_write_then_read(spi, &opcode, 1, NULL, &status, 1);
 	return ret ? -EIO : status;
 }
 
@@ -173,7 +175,7 @@ static int spi_dataflash_erase(struct udevice *dev, u32 offset, size_t len)
 		      command[0], command[1], command[2], command[3],
 		      pageaddr);
 
-		status = spi_flash_cmd_write(spi, command, 4, NULL, 0);
+		status = spi_write_then_read(spi, command, 4, NULL, NULL, 0);
 		if (status < 0) {
 			debug("%s: erase send command error!\n", dev->name);
 			return -EIO;
@@ -248,7 +250,7 @@ static int spi_dataflash_read(struct udevice *dev, u32 offset, size_t len,
 	command[3] = (uint8_t)(addr >> 0);
 
 	/* plus 4 "don't care" bytes, command len: 4 + 4 "don't care" bytes */
-	status = spi_flash_cmd_read(spi, command, 8, buf, len);
+	status = spi_write_then_read(spi, command, 8, NULL, buf, len);
 
 	spi_release_bus(spi);
 
@@ -327,7 +329,8 @@ int spi_dataflash_write(struct udevice *dev, u32 offset, size_t len,
 			debug("TRANSFER: (%x) %x %x %x\n",
 			      command[0], command[1], command[2], command[3]);
 
-			status = spi_flash_cmd_write(spi, command, 4, NULL, 0);
+			status = spi_write_then_read(spi, command, 4,
+						     NULL, NULL, 0);
 			if (status < 0) {
 				debug("%s: write(<pagesize) command error!\n",
 				      dev->name);
@@ -352,8 +355,8 @@ int spi_dataflash_write(struct udevice *dev, u32 offset, size_t len,
 		debug("PROGRAM: (%x) %x %x %x\n",
 		      command[0], command[1], command[2], command[3]);
 
-		status = spi_flash_cmd_write(spi, command,
-					     4, writebuf, writelen);
+		status = spi_write_then_read(spi, command, 4,
+					     writebuf, NULL, writelen);
 		if (status < 0) {
 			debug("%s: write send command error!\n", dev->name);
 			return -EIO;
@@ -376,8 +379,8 @@ int spi_dataflash_write(struct udevice *dev, u32 offset, size_t len,
 		debug("COMPARE: (%x) %x %x %x\n",
 		      command[0], command[1], command[2], command[3]);
 
-		status = spi_flash_cmd_write(spi, command,
-					     4, writebuf, writelen);
+		status = spi_write_then_read(spi, command, 4,
+					     writebuf, NULL, writelen);
 		if (status < 0) {
 			debug("%s: write(compare) send command error!\n",
 			      dev->name);
@@ -508,6 +511,7 @@ static struct data_flash_info *jedec_probe(struct spi_slave *spi)
 	uint8_t			id[5];
 	uint32_t		jedec;
 	struct data_flash_info	*info;
+	u8 opcode		= CMD_READ_ID;
 	int status;
 
 	/*
@@ -519,7 +523,7 @@ static struct data_flash_info *jedec_probe(struct spi_slave *spi)
 	 * That's not an error; only rev C and newer chips handle it, and
 	 * only Atmel sells these chips.
 	 */
-	tmp = spi_flash_cmd(spi, CMD_READ_ID, id, sizeof(id));
+	tmp = spi_write_then_read(spi, &opcode, 1, NULL, id, sizeof(id));
 	if (tmp < 0) {
 		printf("dataflash: error %d reading JEDEC ID\n", tmp);
 		return ERR_PTR(tmp);
diff --git a/drivers/mtd/spi/sf_internal.h b/drivers/mtd/spi/sf_internal.h
index a6bf734830..bb8c19a31c 100644
--- a/drivers/mtd/spi/sf_internal.h
+++ b/drivers/mtd/spi/sf_internal.h
@@ -65,6 +65,7 @@ struct flash_info {
 #define NO_CHIP_ERASE		BIT(12) /* Chip does not support chip erase */
 #define SPI_NOR_SKIP_SFDP	BIT(13)	/* Skip parsing of SFDP tables */
 #define USE_CLSR		BIT(14)	/* use CLSR command */
+#define SPI_NOR_HAS_SST26LOCK	BIT(15)	/* Flash supports lock/unlock via BPR */
 };
 
 extern const struct flash_info spi_nor_ids[];
@@ -72,24 +73,6 @@ extern const struct flash_info spi_nor_ids[];
 #define JEDEC_MFR(info)	((info)->id[0])
 #define JEDEC_ID(info)		(((info)->id[1]) << 8 | ((info)->id[2]))
 
-/* Send a single-byte command to the device and read the response */
-int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len);
-
-/*
- * Send a multi-byte command to the device and read the response. Used
- * for flash array reads, etc.
- */
-int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd,
-		size_t cmd_len, void *data, size_t data_len);
-
-/*
- * Send a multi-byte command to the device followed by (optional)
- * data. Used for programming the flash array, etc.
- */
-int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len,
-		const void *data, size_t data_len);
-
-
 /* Get software write-protect value (BP bits) */
 int spi_flash_cmd_get_sw_write_prot(struct spi_flash *flash);
 
diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c
index 1acff745d1..990e39d7c2 100644
--- a/drivers/mtd/spi/spi-nor-core.c
+++ b/drivers/mtd/spi/spi-nor-core.c
@@ -945,6 +945,177 @@ read_err:
 }
 
 #ifdef CONFIG_SPI_FLASH_SST
+/*
+ * sst26 flash series has its own block protection implementation:
+ * 4x   - 8  KByte blocks - read & write protection bits - upper addresses
+ * 1x   - 32 KByte blocks - write protection bits
+ * rest - 64 KByte blocks - write protection bits
+ * 1x   - 32 KByte blocks - write protection bits
+ * 4x   - 8  KByte blocks - read & write protection bits - lower addresses
+ *
+ * We'll support only per 64k lock/unlock so lower and upper 64 KByte region
+ * will be treated as single block.
+ */
+#define SST26_BPR_8K_NUM		4
+#define SST26_MAX_BPR_REG_LEN		(18 + 1)
+#define SST26_BOUND_REG_SIZE		((32 + SST26_BPR_8K_NUM * 8) * SZ_1K)
+
+enum lock_ctl {
+	SST26_CTL_LOCK,
+	SST26_CTL_UNLOCK,
+	SST26_CTL_CHECK
+};
+
+static bool sst26_process_bpr(u32 bpr_size, u8 *cmd, u32 bit, enum lock_ctl ctl)
+{
+	switch (ctl) {
+	case SST26_CTL_LOCK:
+		cmd[bpr_size - (bit / 8) - 1] |= BIT(bit % 8);
+		break;
+	case SST26_CTL_UNLOCK:
+		cmd[bpr_size - (bit / 8) - 1] &= ~BIT(bit % 8);
+		break;
+	case SST26_CTL_CHECK:
+		return !!(cmd[bpr_size - (bit / 8) - 1] & BIT(bit % 8));
+	}
+
+	return false;
+}
+
+/*
+ * Lock, unlock or check lock status of the flash region of the flash (depending
+ * on the lock_ctl value)
+ */
+static int sst26_lock_ctl(struct spi_nor *nor, loff_t ofs, uint64_t len, enum lock_ctl ctl)
+{
+	struct mtd_info *mtd = &nor->mtd;
+	u32 i, bpr_ptr, rptr_64k, lptr_64k, bpr_size;
+	bool lower_64k = false, upper_64k = false;
+	u8 bpr_buff[SST26_MAX_BPR_REG_LEN] = {};
+	int ret;
+
+	/* Check length and offset for 64k alignment */
+	if ((ofs & (SZ_64K - 1)) || (len & (SZ_64K - 1))) {
+		dev_err(nor->dev, "length or offset is not 64KiB allighned\n");
+		return -EINVAL;
+	}
+
+	if (ofs + len > mtd->size) {
+		dev_err(nor->dev, "range is more than device size: %#llx + %#llx > %#llx\n",
+			ofs, len, mtd->size);
+		return -EINVAL;
+	}
+
+	/* SST26 family has only 16 Mbit, 32 Mbit and 64 Mbit IC */
+	if (mtd->size != SZ_2M &&
+	    mtd->size != SZ_4M &&
+	    mtd->size != SZ_8M)
+		return -EINVAL;
+
+	bpr_size = 2 + (mtd->size / SZ_64K / 8);
+
+	ret = nor->read_reg(nor, SPINOR_OP_READ_BPR, bpr_buff, bpr_size);
+	if (ret < 0) {
+		dev_err(nor->dev, "fail to read block-protection register\n");
+		return ret;
+	}
+
+	rptr_64k = min_t(u32, ofs + len, mtd->size - SST26_BOUND_REG_SIZE);
+	lptr_64k = max_t(u32, ofs, SST26_BOUND_REG_SIZE);
+
+	upper_64k = ((ofs + len) > (mtd->size - SST26_BOUND_REG_SIZE));
+	lower_64k = (ofs < SST26_BOUND_REG_SIZE);
+
+	/* Lower bits in block-protection register are about 64k region */
+	bpr_ptr = lptr_64k / SZ_64K - 1;
+
+	/* Process 64K blocks region */
+	while (lptr_64k < rptr_64k) {
+		if (sst26_process_bpr(bpr_size, bpr_buff, bpr_ptr, ctl))
+			return EACCES;
+
+		bpr_ptr++;
+		lptr_64k += SZ_64K;
+	}
+
+	/* 32K and 8K region bits in BPR are after 64k region bits */
+	bpr_ptr = (mtd->size - 2 * SST26_BOUND_REG_SIZE) / SZ_64K;
+
+	/* Process lower 32K block region */
+	if (lower_64k)
+		if (sst26_process_bpr(bpr_size, bpr_buff, bpr_ptr, ctl))
+			return EACCES;
+
+	bpr_ptr++;
+
+	/* Process upper 32K block region */
+	if (upper_64k)
+		if (sst26_process_bpr(bpr_size, bpr_buff, bpr_ptr, ctl))
+			return EACCES;
+
+	bpr_ptr++;
+
+	/* Process lower 8K block regions */
+	for (i = 0; i < SST26_BPR_8K_NUM; i++) {
+		if (lower_64k)
+			if (sst26_process_bpr(bpr_size, bpr_buff, bpr_ptr, ctl))
+				return EACCES;
+
+		/* In 8K area BPR has both read and write protection bits */
+		bpr_ptr += 2;
+	}
+
+	/* Process upper 8K block regions */
+	for (i = 0; i < SST26_BPR_8K_NUM; i++) {
+		if (upper_64k)
+			if (sst26_process_bpr(bpr_size, bpr_buff, bpr_ptr, ctl))
+				return EACCES;
+
+		/* In 8K area BPR has both read and write protection bits */
+		bpr_ptr += 2;
+	}
+
+	/* If we check region status we don't need to write BPR back */
+	if (ctl == SST26_CTL_CHECK)
+		return 0;
+
+	ret = nor->write_reg(nor, SPINOR_OP_WRITE_BPR, bpr_buff, bpr_size);
+	if (ret < 0) {
+		dev_err(nor->dev, "fail to write block-protection register\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int sst26_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len)
+{
+	return sst26_lock_ctl(nor, ofs, len, SST26_CTL_UNLOCK);
+}
+
+static int sst26_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
+{
+	return sst26_lock_ctl(nor, ofs, len, SST26_CTL_LOCK);
+}
+
+/*
+ * Returns EACCES (positive value) if region is locked, 0 if region is unlocked,
+ * and negative on errors.
+ */
+static int sst26_is_locked(struct spi_nor *nor, loff_t ofs, uint64_t len)
+{
+	/*
+	 * is_locked function is used for check before reading or erasing flash
+	 * region, so offset and length might be not 64k allighned, so adjust
+	 * them to be 64k allighned as sst26_lock_ctl works only with 64k
+	 * allighned regions.
+	 */
+	ofs -= ofs & (SZ_64K - 1);
+	len = len & (SZ_64K - 1) ? (len & ~(SZ_64K - 1)) + SZ_64K : len;
+
+	return sst26_lock_ctl(nor, ofs, len, SST26_CTL_CHECK);
+}
+
 static int sst_write_byteprogram(struct spi_nor *nor, loff_t to, size_t len,
 				 size_t *retlen, const u_char *buf)
 {
@@ -2302,6 +2473,16 @@ int spi_nor_scan(struct spi_nor *nor)
 #endif
 
 #ifdef CONFIG_SPI_FLASH_SST
+	/*
+	 * sst26 series block protection implementation differs from other
+	 * series.
+	 */
+	if (info->flags & SPI_NOR_HAS_SST26LOCK) {
+		nor->flash_lock = sst26_lock;
+		nor->flash_unlock = sst26_unlock;
+		nor->flash_is_locked = sst26_is_locked;
+	}
+
 	/* sst nor chips use AAI word program */
 	if (info->flags & SST_WRITE)
 		mtd->_write = sst_write;
diff --git a/drivers/mtd/spi/spi-nor-ids.c b/drivers/mtd/spi/spi-nor-ids.c
index a3920ba520..6996c0a286 100644
--- a/drivers/mtd/spi/spi-nor-ids.c
+++ b/drivers/mtd/spi/spi-nor-ids.c
@@ -214,10 +214,10 @@ const struct flash_info spi_nor_ids[] = {
 	{ INFO("sst25wf040b", 0x621613, 0, 64 * 1024,  8, SECT_4K) },
 	{ INFO("sst25wf040",  0xbf2504, 0, 64 * 1024,  8, SECT_4K | SST_WRITE) },
 	{ INFO("sst25wf080",  0xbf2505, 0, 64 * 1024, 16, SECT_4K | SST_WRITE) },
-	{ INFO("sst26vf064b", 0xbf2643, 0, 64 * 1024, 128, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
-	{ INFO("sst26wf016",  0xbf2651, 0, 64 * 1024,  32, SECT_4K) },
-	{ INFO("sst26wf032",  0xbf2622, 0, 64 * 1024,  64, SECT_4K) },
-	{ INFO("sst26wf064",  0xbf2643, 0, 64 * 1024, 128, SECT_4K) },
+	{ INFO("sst26vf064b", 0xbf2643, 0, 64 * 1024, 128, SECT_4K | SPI_NOR_HAS_SST26LOCK | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
+	{ INFO("sst26wf016",  0xbf2651, 0, 64 * 1024,  32, SECT_4K | SPI_NOR_HAS_SST26LOCK) },
+	{ INFO("sst26wf032",  0xbf2622, 0, 64 * 1024,  64, SECT_4K | SPI_NOR_HAS_SST26LOCK) },
+	{ INFO("sst26wf064",  0xbf2643, 0, 64 * 1024, 128, SECT_4K | SPI_NOR_HAS_SST26LOCK) },
 #endif
 #ifdef CONFIG_SPI_FLASH_STMICRO		/* STMICRO */
 	/* ST Microelectronics -- newer production may have feature updates */
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index f459c0a411..8dd3213d48 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -419,7 +419,6 @@ config MXC_SPI
 
 config MXS_SPI
 	bool "MXS SPI Driver"
-	depends on DEPRECATED
 	help
 	  Enable the MXS SPI controller driver. This driver can be used
 	  on the i.MX23 and i.MX28 SoCs.
diff --git a/drivers/spi/mvebu_a3700_spi.c b/drivers/spi/mvebu_a3700_spi.c
index feeafdceaa..99ad505f24 100644
--- a/drivers/spi/mvebu_a3700_spi.c
+++ b/drivers/spi/mvebu_a3700_spi.c
@@ -181,10 +181,9 @@ static int mvebu_spi_set_speed(struct udevice *bus, uint hz)
 	data = readl(&reg->cfg);
 
 	prescale = DIV_ROUND_UP(clk_get_rate(&plat->clk), hz);
-	if (prescale > 0x1f)
-		prescale = 0x1f;
-	else if (prescale > 0xf)
+	if (prescale > 0xf)
 		prescale = 0x10 + (prescale + 1) / 2;
+	prescale = min(prescale, 0x1fu);
 
 	data &= ~MVEBU_SPI_A3700_CLK_PRESCALE_MASK;
 	data |= prescale & MVEBU_SPI_A3700_CLK_PRESCALE_MASK;
diff --git a/drivers/spi/soft_spi.c b/drivers/spi/soft_spi.c
index b06883f9d0..b80f810bd1 100644
--- a/drivers/spi/soft_spi.c
+++ b/drivers/spi/soft_spi.c
@@ -215,8 +215,8 @@ static int soft_spi_probe(struct udevice *dev)
 	int cs_flags, clk_flags;
 	int ret;
 
-	cs_flags = (slave->mode & SPI_CS_HIGH) ? 0 : GPIOD_ACTIVE_LOW;
-	clk_flags = (slave->mode & SPI_CPOL) ? GPIOD_ACTIVE_LOW : 0;
+	cs_flags = (slave && slave->mode & SPI_CS_HIGH) ? 0 : GPIOD_ACTIVE_LOW;
+	clk_flags = (slave && slave->mode & SPI_CPOL) ? GPIOD_ACTIVE_LOW : 0;
 
 	if (gpio_request_by_name(dev, "cs-gpios", 0, &plat->cs,
 				 GPIOD_IS_OUT | cs_flags) ||
diff --git a/drivers/spi/spi-uclass.c b/drivers/spi/spi-uclass.c
index 88cb2a1262..76c4b53c16 100644
--- a/drivers/spi/spi-uclass.c
+++ b/drivers/spi/spi-uclass.c
@@ -108,6 +108,30 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
 	return dm_spi_xfer(slave->dev, bitlen, dout, din, flags);
 }
 
+int spi_write_then_read(struct spi_slave *slave, const u8 *opcode,
+			size_t n_opcode, const u8 *txbuf, u8 *rxbuf,
+			size_t n_buf)
+{
+	unsigned long flags = SPI_XFER_BEGIN;
+	int ret;
+
+	if (n_buf == 0)
+		flags |= SPI_XFER_END;
+
+	ret = spi_xfer(slave, n_opcode * 8, opcode, NULL, flags);
+	if (ret) {
+		debug("spi: failed to send command (%zu bytes): %d\n",
+		      n_opcode, ret);
+	} else if (n_buf != 0) {
+		ret = spi_xfer(slave, n_buf * 8, txbuf, rxbuf, SPI_XFER_END);
+		if (ret)
+			debug("spi: failed to transfer %zu bytes of data: %d\n",
+			      n_buf, ret);
+	}
+
+	return ret;
+}
+
 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
 static int spi_child_post_bind(struct udevice *dev)
 {
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index 88e80af579..709b49d393 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -91,6 +91,10 @@
 #define SPINOR_OP_WRDI		0x04	/* Write disable */
 #define SPINOR_OP_AAI_WP	0xad	/* Auto address increment word program */
 
+/* Used for SST26* flashes only. */
+#define SPINOR_OP_READ_BPR	0x72	/* Read block protection register */
+#define SPINOR_OP_WRITE_BPR	0x42	/* Write block protection register */
+
 /* Used for S3AN flashes only */
 #define SPINOR_OP_XSE		0x50	/* Sector erase */
 #define SPINOR_OP_XPP		0x82	/* Page program */
diff --git a/include/spi.h b/include/spi.h
index 378594163b..5eec0c4775 100644
--- a/include/spi.h
+++ b/include/spi.h
@@ -248,6 +248,26 @@ int spi_set_wordlen(struct spi_slave *slave, unsigned int wordlen);
 int  spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
 		void *din, unsigned long flags);
 
+/**
+ * spi_write_then_read - SPI synchronous write followed by read
+ *
+ * This performs a half duplex transaction in which the first transaction
+ * is to send the opcode and if the length of buf is non-zero then it start
+ * the second transaction as tx or rx based on the need from respective slave.
+ *
+ * @slave:	The SPI slave device with which opcode/data will be exchanged
+ * @opcode:	opcode used for specific transfer
+ * @n_opcode:	size of opcode, in bytes
+ * @txbuf:	buffer into which data to be written
+ * @rxbuf:	buffer into which data will be read
+ * @n_buf:	size of buf (whether it's [tx|rx]buf), in bytes
+ *
+ * Returns: 0 on success, not 0 on failure
+ */
+int spi_write_then_read(struct spi_slave *slave, const u8 *opcode,
+			size_t n_opcode, const u8 *txbuf, u8 *rxbuf,
+			size_t n_buf);
+
 /* Copy memory mapped data */
 void spi_flash_copy_mmap(void *data, void *offset, size_t len);