sf: unify write enable commands

Every spi flash uses the same write enable command, so unify this in
the common code.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

drivers/mtd/spi/eon.c

@@ -91,7 +91,7 @@ static int eon_write(struct spi_flash *flash,
 		    ("PP: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x } chunk_len = %d\n",
 		     buf + actual, cmd[0], cmd[1], cmd[2], cmd[3], chunk_len);
 
-		ret = spi_flash_cmd(flash->spi, CMD_EN25Q128_WREN, NULL, 0);
+		ret = spi_flash_cmd_write_enable(flash);
 		if (ret < 0) {
 			debug("SF: Enabling Write failed\n");
 			break;

drivers/mtd/spi/macronix.c

@@ -147,7 +147,7 @@ static int macronix_write(struct spi_flash *flash,
 		    ("PP: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x } chunk_len = %d\n",
 		     buf + actual, cmd[0], cmd[1], cmd[2], cmd[3], chunk_len);
 
-		ret = spi_flash_cmd(flash->spi, CMD_MX25XX_WREN, NULL, 0);
+		ret = spi_flash_cmd_write_enable(flash);
 		if (ret < 0) {
 			debug("SF: Enabling Write failed\n");
 			break;

drivers/mtd/spi/ramtron.c

@@ -198,7 +198,7 @@ static int ramtron_common(struct spi_flash *flash,
 
 	if (command == CMD_RAMTRON_WRITE) {
 		/* send WREN */
-		ret = spi_flash_cmd(flash->spi, CMD_RAMTRON_WREN, NULL, 0);
+		ret = spi_flash_cmd_write_enable(flash);
 		if (ret < 0) {
 			debug("SF: Enabling Write failed\n");
 			goto releasebus;

drivers/mtd/spi/spansion.c

@@ -168,7 +168,7 @@ static int spansion_write(struct spi_flash *flash,
 		    ("PP: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x } chunk_len = %d\n",
 		     buf + actual, cmd[0], cmd[1], cmd[2], cmd[3], chunk_len);
 
-		ret = spi_flash_cmd(flash->spi, CMD_S25FLXX_WREN, NULL, 0);
+		ret = spi_flash_cmd_write_enable(flash);
 		if (ret < 0) {
 			debug("SF: Enabling Write failed\n");
 			break;

drivers/mtd/spi/spi_flash.c

@@ -163,7 +163,7 @@ int spi_flash_cmd_erase(struct spi_flash *flash, u8 erase_cmd,
 		debug("SF: erase %2x %2x %2x %2x (%x)\n", cmd[0], cmd[1],
 		      cmd[2], cmd[3], offset);
 
-		ret = spi_flash_cmd(flash->spi, CMD_WRITE_ENABLE, NULL, 0);
+		ret = spi_flash_cmd_write_enable(flash);
 		if (ret)
 			goto out;
 

drivers/mtd/spi/spi_flash_internal.h

@@ -45,6 +45,14 @@ int spi_flash_cmd_read_fast(struct spi_flash *flash, u32 offset,
 int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len,
 		const void *data, size_t data_len);
 
+/*
+ * Enable writing on the SPI flash.
+ */
+static inline int spi_flash_cmd_write_enable(struct spi_flash *flash)
+{
+	return spi_flash_cmd(flash->spi, CMD_WRITE_ENABLE, NULL, 0);
+}
+
 /*
  * Same as spi_flash_cmd_read() except it also claims/releases the SPI
  * bus. Used as common part of the ->read() operation.

drivers/mtd/spi/sst.c

@@ -96,7 +96,7 @@ static const struct sst_spi_flash_params sst_spi_flash_table[] = {
 static int
 sst_enable_writing(struct spi_flash *flash)
 {
-	int ret = spi_flash_cmd(flash->spi, CMD_SST_WREN, NULL, 0);
+	int ret = spi_flash_cmd_write_enable(flash);
 	if (ret)
 		debug("SF: Enabling Write failed\n");
 	return ret;

drivers/mtd/spi/stmicro.c

@@ -169,7 +169,7 @@ static int stmicro_write(struct spi_flash *flash,
 		    ("PP: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x } chunk_len = %d\n",
 		     buf + actual, cmd[0], cmd[1], cmd[2], cmd[3], chunk_len);
 
-		ret = spi_flash_cmd(flash->spi, CMD_M25PXX_WREN, NULL, 0);
+		ret = spi_flash_cmd_write_enable(flash);
 		if (ret < 0) {
 			debug("SF: Enabling Write failed\n");
 			break;

drivers/mtd/spi/winbond.c

@@ -140,7 +140,7 @@ static int winbond_write(struct spi_flash *flash,
 			buf + actual,
 			cmd[0], cmd[1], cmd[2], cmd[3], chunk_len);
 
-		ret = spi_flash_cmd(flash->spi, CMD_W25_WREN, NULL, 0);
+		ret = spi_flash_cmd_write_enable(flash);
 		if (ret < 0) {
 			debug("SF: Enabling Write failed\n");
 			goto out;