sf: spi_flash cleanups

More cleanups on spi_flash side:
- Removed unneeded comments.
- Rearranged macros in proper location.
- Rearranged func declerations
- Renamed few function names.
- Added License headers.

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

4 files changed, 82 insertions, 61 deletions

diff --git a/drivers/mtd/spi/Makefile b/drivers/mtd/spi/Makefile
index 5678134..0fa867d 100644
--- a/drivers/mtd/spi/Makefile
+++ b/drivers/mtd/spi/Makefile
@@ -17,8 +17,8 @@ endif
 ifdef CONFIG_CMD_SF
 COBJS-y        += spi_flash.o
 endif
-COBJS-$(CONFIG_SPI_FLASH)	+= spi_flash_probe.o spi_flash_ops.o
-COBJS-$(CONFIG_SPI_FRAM_RAMTRON)	+= ramtron.o
+COBJS-$(CONFIG_SPI_FLASH) += spi_flash_probe.o spi_flash_ops.o
+COBJS-$(CONFIG_SPI_FRAM_RAMTRON) += ramtron.o
 COBJS-$(CONFIG_SPI_M95XXX) += eeprom_m95xxx.o
 
 COBJS	:= $(COBJS-y)
diff --git a/drivers/mtd/spi/spi_flash_internal.h b/drivers/mtd/spi/spi_flash_internal.h
index 1f9f170..29a14f4 100644
--- a/drivers/mtd/spi/spi_flash_internal.h
+++ b/drivers/mtd/spi/spi_flash_internal.h
@@ -2,37 +2,43 @@
  * SPI flash internal definitions
  *
  * Copyright (C) 2008 Atmel Corporation
+ * Copyright (C) 2013 Jagannadha Sutradharudu Teki, Xilinx Inc.
+ *
+ * Licensed under the GPL-2 or later.
  */
 
-/* Common parameters -- kind of high, but they should only occur when there
- * is a problem (and well your system already is broken), so err on the side
- * of caution in case we're dealing with slower SPI buses and/or processors.
- */
-#define SPI_FLASH_PROG_TIMEOUT		(2 * CONFIG_SYS_HZ)
-#define SPI_FLASH_PAGE_ERASE_TIMEOUT	(5 * CONFIG_SYS_HZ)
-#define SPI_FLASH_SECTOR_ERASE_TIMEOUT	(10 * CONFIG_SYS_HZ)
+#ifndef _SPI_FLASH_INTERNAL_H_
+#define _SPI_FLASH_INTERNAL_H_
 
-/* Common commands */
-#define CMD_READ_ID			0x9f
+#define SPI_FLASH_16MB_BOUN		0x1000000
 
-#define CMD_READ_ARRAY_SLOW		0x03
-#define CMD_READ_ARRAY_FAST		0x0b
+/* SECT flags */
+#define SECT_4K			(1 << 1)
+#define SECT_32K			(1 << 2)
+#define E_FSR				(1 << 3)
+
+/* Erase commands */
+#define CMD_ERASE_4K			0x20
+#define CMD_ERASE_32K			0x52
+#define CMD_ERASE_CHIP			0xc7
+#define CMD_ERASE_64K			0xd8
 
+/* Write commands */
 #define CMD_WRITE_STATUS		0x01
 #define CMD_PAGE_PROGRAM		0x02
 #define CMD_WRITE_DISABLE		0x04
 #define CMD_READ_STATUS			0x05
-#define CMD_FLAG_STATUS			0x70
 #define CMD_WRITE_ENABLE		0x06
-#define CMD_ERASE_4K			0x20
-#define CMD_ERASE_32K			0x52
-#define CMD_ERASE_64K			0xd8
-#define CMD_ERASE_CHIP			0xc7
+#define CMD_READ_CONFIG		0x35
+#define CMD_FLAG_STATUS		0x70
 
-#define SPI_FLASH_16MB_BOUN		0x1000000
+/* Read commands */
+#define CMD_READ_ARRAY_SLOW		0x03
+#define CMD_READ_ARRAY_FAST		0x0b
+#define CMD_READ_ID			0x9f
 
-#ifdef CONFIG_SPI_FLASH_BAR
 /* Bank addr access commands */
+#ifdef CONFIG_SPI_FLASH_BAR
 # define CMD_BANKADDR_BRWR		0x17
 # define CMD_BANKADDR_BRRD		0x16
 # define CMD_EXTNADDR_WREAR		0xC5
@@ -43,6 +49,21 @@
 #define STATUS_WIP			0x01
 #define STATUS_PEC			0x80
 
+/* Flash timeout values */
+#define SPI_FLASH_PROG_TIMEOUT		(2 * CONFIG_SYS_HZ)
+#define SPI_FLASH_PAGE_ERASE_TIMEOUT	(5 * CONFIG_SYS_HZ)
+#define SPI_FLASH_SECTOR_ERASE_TIMEOUT	(10 * CONFIG_SYS_HZ)
+
+/* SST specific */
+#ifdef CONFIG_SPI_FLASH_SST
+# define SST_WP			0x01	/* Supports AAI word program */
+# define CMD_SST_BP			0x02    /* Byte Program */
+# define CMD_SST_AAI_WP		0xAD	/* Auto Address Incr Word Program */
+
+int sst_write_wp(struct spi_flash *flash, u32 offset, size_t len,
+		const void *buf);
+#endif
+
 /* 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);
 
@@ -53,9 +74,6 @@ int spi_flash_cmd(struct spi_slave *spi, u8 cmd, void *response, size_t len);
 int spi_flash_cmd_read(struct spi_slave *spi, const u8 *cmd,
 		size_t cmd_len, void *data, size_t data_len);
 
-int spi_flash_cmd_read_fast(struct spi_flash *flash, u32 offset,
-		size_t len, void *data);
-
 /*
  * Send a multi-byte command to the device followed by (optional)
  * data. Used for programming the flash array, etc.
@@ -63,43 +81,34 @@ 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);
 
-/*
- * Write the requested data out breaking it up into multiple write
- * commands as needed per the write size.
- */
-int spi_flash_cmd_write_multi(struct spi_flash *flash, u32 offset,
-		size_t len, const void *buf);
 
-#ifdef CONFIG_SPI_FLASH_SST
-int sst_write_wp(struct spi_flash *flash, u32 offset, size_t len,
-		const void *buf);
-#endif
+/* Flash erase(sectors) operation, support all possible erase commands */
+int spi_flash_cmd_erase_ops(struct spi_flash *flash, u32 offset, size_t len);
 
-/*
- * Enable writing on the SPI flash.
- */
+/* Program the status register */
+int spi_flash_cmd_write_status(struct spi_flash *flash, u8 sr);
+
+/* Set quad enbale bit */
+int spi_flash_set_qeb(struct spi_flash *flash);
+
+/* 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);
 }
 
-/*
- * Disable writing on the SPI flash.
- */
+/* Disable writing on the SPI flash */
 static inline int spi_flash_cmd_write_disable(struct spi_flash *flash)
 {
 	return spi_flash_cmd(flash->spi, CMD_WRITE_DISABLE, NULL, 0);
 }
 
-/* Program the status register. */
-int spi_flash_cmd_write_status(struct spi_flash *flash, u8 sr);
-
 /*
- * Same as spi_flash_cmd_read() except it also claims/releases the SPI
- * bus. Used as common part of the ->read() operation.
+ * Send the read status command to the device and wait for the wip
+ * (write-in-progress) bit to clear itself.
  */
-int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
-		size_t cmd_len, void *data, size_t data_len);
+int spi_flash_cmd_wait_ready(struct spi_flash *flash, unsigned long timeout);
+
 /*
  * Used for spi_flash write operation
  * - SPI claim
@@ -112,10 +121,22 @@ int spi_flash_write_common(struct spi_flash *flash, const u8 *cmd,
 		size_t cmd_len, const void *buf, size_t buf_len);
 
 /*
- * Send the read status command to the device and wait for the wip
- * (write-in-progress) bit to clear itself.
+ * Flash write operation, support all possible write commands.
+ * Write the requested data out breaking it up into multiple write
+ * commands as needed per the write size.
  */
-int spi_flash_cmd_wait_ready(struct spi_flash *flash, unsigned long timeout);
+int spi_flash_cmd_write_ops(struct spi_flash *flash, u32 offset,
+		size_t len, const void *buf);
+
+/*
+ * Same as spi_flash_cmd_read() except it also claims/releases the SPI
+ * bus. Used as common part of the ->read() operation.
+ */
+int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
+		size_t cmd_len, void *data, size_t data_len);
+
+/* Flash read operation, support all possible read commands */
+int spi_flash_cmd_read_ops(struct spi_flash *flash, u32 offset,
+		size_t len, void *data);
 
-/* Erase sectors. */
-int spi_flash_cmd_erase(struct spi_flash *flash, u32 offset, size_t len);
+#endif /* _SPI_FLASH_INTERNAL_H_ */
diff --git a/drivers/mtd/spi/spi_flash_ops.c b/drivers/mtd/spi/spi_flash_ops.c
index b4e1c40..882c8f5 100644
--- a/drivers/mtd/spi/spi_flash_ops.c
+++ b/drivers/mtd/spi/spi_flash_ops.c
@@ -147,7 +147,7 @@ int spi_flash_write_common(struct spi_flash *flash, const u8 *cmd,
 	return ret;
 }
 
-int spi_flash_cmd_erase(struct spi_flash *flash, u32 offset, size_t len)
+int spi_flash_cmd_erase_ops(struct spi_flash *flash, u32 offset, size_t len)
 {
 	u32 erase_size;
 	u8 cmd[4];
@@ -190,7 +190,7 @@ int spi_flash_cmd_erase(struct spi_flash *flash, u32 offset, size_t len)
 	return ret;
 }
 
-int spi_flash_cmd_write_multi(struct spi_flash *flash, u32 offset,
+int spi_flash_cmd_write_ops(struct spi_flash *flash, u32 offset,
 		size_t len, const void *buf)
 {
 	unsigned long byte_addr, page_size;
@@ -260,7 +260,7 @@ int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd,
 	return ret;
 }
 
-int spi_flash_cmd_read_fast(struct spi_flash *flash, u32 offset,
+int spi_flash_cmd_read_ops(struct spi_flash *flash, u32 offset,
 		size_t len, void *data)
 {
 	u8 cmd[5], bank_sel = 0;
diff --git a/drivers/mtd/spi/spi_flash_probe.c b/drivers/mtd/spi/spi_flash_probe.c
index 1806fd1..e9fd013 100644
--- a/drivers/mtd/spi/spi_flash_probe.c
+++ b/drivers/mtd/spi/spi_flash_probe.c
@@ -18,7 +18,7 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-/*
+/**
  * struct spi_flash_params - SPI/QSPI flash device params structure
  *
  * @name:		Device name ([MANUFLETTER][DEVTYPE][DENSITY][EXTRAINFO])
@@ -151,7 +151,7 @@ static const struct spi_flash_params spi_flash_params_table[] = {
 	 */
 };
 
-struct spi_flash *spi_flash_validate_ids(struct spi_slave *spi, u8 *idcode)
+struct spi_flash *spi_flash_validate_params(struct spi_slave *spi, u8 *idcode)
 {
 	const struct spi_flash_params *params;
 	struct spi_flash *flash;
@@ -190,13 +190,13 @@ struct spi_flash *spi_flash_validate_ids(struct spi_slave *spi, u8 *idcode)
 	flash->name = params->name;
 
 	/* Assign spi_flash ops */
-	flash->write = spi_flash_cmd_write_multi;
+	flash->write = spi_flash_cmd_write_ops;
 #ifdef CONFIG_SPI_FLASH_SST
 	if (params->flags & SST_WP)
 		flash->write = sst_write_wp;
 #endif
-	flash->erase = spi_flash_cmd_erase;
-	flash->read = spi_flash_cmd_read_fast;
+	flash->erase = spi_flash_cmd_erase_ops;
+	flash->read = spi_flash_cmd_read_ops;
 
 	/* Compute the flash size */
 	flash->page_size = (ext_jedec == 0x4d00) ? 512 : 256;
@@ -314,8 +314,8 @@ struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 	print_buffer(0, idcode, 1, sizeof(idcode), 0);
 #endif
 
-	/* Validate ID's from flash dev table */
-	flash = spi_flash_validate_ids(spi, idcode);
+	/* Validate params from spi_flash_params table */
+	flash = spi_flash_validate_params(spi, idcode);
 	if (!flash)
 		goto err_read_id;