sf: Divide flash register ops from QEB code

QEB code comprises of couple of flash register read/write operations,
this patch moved flash register operations on to sf_op

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>

drivers/mtd/spi/sf_internal.h

@@ -101,14 +101,17 @@ int spi_flash_cmd_write(struct spi_slave *spi, const u8 *cmd, size_t cmd_len,
 /* Flash erase(sectors) operation, support all possible erase commands */
 int spi_flash_cmd_erase_ops(struct spi_flash *flash, u32 offset, size_t len);
 
+/* Read the status register */
+int spi_flash_cmd_read_status(struct spi_flash *flash, u8 *rs);
+
 /* Program the status register */
 int spi_flash_cmd_write_status(struct spi_flash *flash, u8 sr);
 
-/* Set quad enbale bit for macronix flashes */
-int spi_flash_set_qeb_mxic(struct spi_flash *flash);
+/* Read the config register */
+int spi_flash_cmd_read_config(struct spi_flash *flash, u8 *rc);
 
-/* Set quad enbale bit for winbond and spansion flashes */
-int spi_flash_set_qeb_winspan(struct spi_flash *flash);
+/* Program the config register */
+int spi_flash_cmd_write_config(struct spi_flash *flash, u8 wc);
 
 /* Enable writing on the SPI flash */
 static inline int spi_flash_cmd_write_enable(struct spi_flash *flash)

drivers/mtd/spi/sf_ops.c

@@ -24,94 +24,71 @@ static void spi_flash_addr(u32 addr, u8 *cmd)
 	cmd[3] = addr >> 0;
 }
 
-int spi_flash_cmd_write_status(struct spi_flash *flash, u8 sr)
+int spi_flash_cmd_read_status(struct spi_flash *flash, u8 *rs)
 {
-	u8 cmd;
 	int ret;
+	u8 cmd;
 
-	cmd = CMD_WRITE_STATUS;
-	ret = spi_flash_write_common(flash, &cmd, 1, &sr, 1);
+	cmd = CMD_READ_STATUS;
+	ret = spi_flash_read_common(flash, &cmd, 1, rs, 1);
 	if (ret < 0) {
-		debug("SF: fail to write status register\n");
+		debug("SF: fail to read status register\n");
 		return ret;
 	}
 
 	return 0;
 }
 
-#ifdef CONFIG_SPI_FLASH_MACRONIX
-int spi_flash_set_qeb_mxic(struct spi_flash *flash)
+int spi_flash_cmd_write_status(struct spi_flash *flash, u8 sr)
 {
-	u8 qeb_status;
 	u8 cmd;
 	int ret;
 
-	cmd = CMD_READ_STATUS;
-	ret = spi_flash_read_common(flash, &cmd, 1, &qeb_status, 1);
+	cmd = CMD_WRITE_STATUS;
+	ret = spi_flash_write_common(flash, &cmd, 1, &sr, 1);
 	if (ret < 0) {
-		debug("SF: fail to read status register\n");
+		debug("SF: fail to write status register\n");
 		return ret;
 	}
 
-	if (qeb_status & STATUS_QEB_MXIC) {
-		debug("SF: Quad enable bit is already set\n");
-	} else {
-		ret = spi_flash_cmd_write_status(flash, STATUS_QEB_MXIC);
-		if (ret < 0)
-			return ret;
-	}
-
-	return ret;
+	return 0;
 }
-#endif
 
 #if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND)
-static int spi_flash_cmd_write_config(struct spi_flash *flash, u8 cr)
+int spi_flash_cmd_read_config(struct spi_flash *flash, u8 *rc)
 {
-	u8 data[2];
-	u8 cmd;
 	int ret;
+	u8 cmd;
 
-	cmd = CMD_READ_STATUS;
-	ret = spi_flash_read_common(flash, &cmd, 1, &data[0], 1);
+	cmd = CMD_READ_CONFIG;
+	ret = spi_flash_read_common(flash, &cmd, 1, rc, 1);
 	if (ret < 0) {
-		debug("SF: fail to read status register\n");
-		return ret;
-	}
-
-	cmd = CMD_WRITE_STATUS;
-	data[1] = cr;
-	ret = spi_flash_write_common(flash, &cmd, 1, &data, 2);
-	if (ret) {
-		debug("SF: fail to write config register\n");
+		debug("SF: fail to read config register\n");
 		return ret;
 	}
 
 	return 0;
 }
 
-int spi_flash_set_qeb_winspan(struct spi_flash *flash)
+int spi_flash_cmd_write_config(struct spi_flash *flash, u8 wc)
 {
-	u8 qeb_status;
+	u8 data[2];
 	u8 cmd;
 	int ret;
 
-	cmd = CMD_READ_CONFIG;
-	ret = spi_flash_read_common(flash, &cmd, 1, &qeb_status, 1);
-	if (ret < 0) {
-		debug("SF: fail to read config register\n");
+	ret = spi_flash_cmd_read_status(flash, &data[0]);
+	if (ret < 0)
 		return ret;
-	}
 
-	if (qeb_status & STATUS_QEB_WINSPAN) {
-		debug("SF: Quad enable bit is already set\n");
-	} else {
-		ret = spi_flash_cmd_write_config(flash, STATUS_QEB_WINSPAN);
-		if (ret < 0)
-			return ret;
+	cmd = CMD_WRITE_STATUS;
+	data[1] = wc;
+	ret = spi_flash_write_common(flash, &cmd, 1, &data, 2);
+	if (ret) {
+		debug("SF: fail to write config register\n");
+		return ret;
 	}
 
-	return ret;
+	return 0;
 }
 #endif
 

drivers/mtd/spi/sf_probe.c

@@ -28,6 +28,50 @@ static u8 spi_read_cmds_array[] = {
 	CMD_READ_QUAD_IO_FAST,
 };
 
+#ifdef CONFIG_SPI_FLASH_MACRONIX
+static int spi_flash_set_qeb_mxic(struct spi_flash *flash)
+{
+	u8 qeb_status;
+	int ret;
+
+	ret = spi_flash_cmd_read_status(flash, &qeb_status);
+	if (ret < 0)
+		return ret;
+
+	if (qeb_status & STATUS_QEB_MXIC) {
+		debug("SF: mxic: QEB is already set\n");
+	} else {
+		ret = spi_flash_cmd_write_status(flash, STATUS_QEB_MXIC);
+		if (ret < 0)
+			return ret;
+	}
+
+	return ret;
+}
+#endif
+
+#if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND)
+static int spi_flash_set_qeb_winspan(struct spi_flash *flash)
+{
+	u8 qeb_status;
+	int ret;
+
+	ret = spi_flash_cmd_read_config(flash, &qeb_status);
+	if (ret < 0)
+		return ret;
+
+	if (qeb_status & STATUS_QEB_WINSPAN) {
+		debug("SF: winspan: QEB is already set\n");
+	} else {
+		ret = spi_flash_cmd_write_config(flash, STATUS_QEB_WINSPAN);
+		if (ret < 0)
+			return ret;
+	}
+
+	return ret;
+}
+#endif
+
 static int spi_flash_set_qeb(struct spi_flash *flash, u8 idcode0)
 {
 	switch (idcode0) {