[U-Boot] [PATCH v4 02/14] sf: Discover the bank addr commands

[Jagannadha Sutradharudu Teki]

Bank/Extended addr commands are specific to particular
flash vendor so discover them based on the idocode0.

Assign the discovered bank commands to spi_flash members
so-that the bank read/write will use their specific operations.

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna at xilinx.com>
---
Changes for v4:
	- none 
Changes for v3:
	- none
Changes for v2:
	- none

 drivers/mtd/spi/spi_flash.c          | 21 +++++++++++++++++++++
 drivers/mtd/spi/spi_flash_internal.h | 14 ++++++++++++++
 include/spi_flash.h                  |  2 ++
 3 files changed, 37 insertions(+)

diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index 9ddd070..9c90f00 100644
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -304,6 +304,27 @@ int spi_flash_cmd_bankaddr_write(struct spi_flash *flash, u8 bank_sel)
 	return 0;
 }
 
+int spi_flash_bank_config(struct spi_flash *flash, u8 idcode0)
+{
+	/* discover bank cmds */
+	switch (idcode0) {
+	case SPI_FLASH_SPANSION_IDCODE0:
+		flash->bank_cmd[0] = CMD_BANKADDR_BRRD;
+		flash->bank_cmd[1] = CMD_BANKADDR_BRWR;
+		break;
+	case SPI_FLASH_STMICRO_IDCODE0:
+	case SPI_FLASH_WINBOND_IDCODE0:
+		flash->bank_cmd[0] = CMD_EXTNADDR_RDEAR;
+		flash->bank_cmd[1] = CMD_EXTNADDR_WREAR;
+		break;
+	default:
+		printf("SF: Unsupported bank commands %02x\n", idcode0);
+		return -1;
+	}
+
+	return 0;
+}
+
 #ifdef CONFIG_OF_CONTROL
 int spi_flash_decode_fdt(const void *blob, struct spi_flash *flash)
 {
diff --git a/drivers/mtd/spi/spi_flash_internal.h b/drivers/mtd/spi/spi_flash_internal.h
index 772fef6..db6c444 100644
--- a/drivers/mtd/spi/spi_flash_internal.h
+++ b/drivers/mtd/spi/spi_flash_internal.h
@@ -28,6 +28,17 @@
 #define CMD_ERASE_64K			0xd8
 #define CMD_ERASE_CHIP			0xc7
 
+/* Manufacture ID's */
+#define SPI_FLASH_SPANSION_IDCODE0	0x01
+#define SPI_FLASH_STMICRO_IDCODE0	0x20
+#define SPI_FLASH_WINBOND_IDCODE0	0xef
+
+/* Bank addr access commands */
+#define CMD_BANKADDR_BRWR		0x17
+#define CMD_BANKADDR_BRRD		0x16
+#define CMD_EXTNADDR_WREAR		0xC5
+#define CMD_EXTNADDR_RDEAR		0xC8
+
 /* Common status */
 #define STATUS_WIP			0x01
 
@@ -80,6 +91,9 @@ int spi_flash_cmd_write_status(struct spi_flash *flash, u8 sr);
 /* Program the bank address register */
 int spi_flash_cmd_bankaddr_write(struct spi_flash *flash, u8 bank_sel);
 
+/* Configure the BAR - discover the bank cmds */
+int spi_flash_bank_config(struct spi_flash *flash, u8 idcode0);
+
 /*
  * Same as spi_flash_cmd_read() except it also claims/releases the SPI
  * bus. Used as common part of the ->read() operation.
diff --git a/include/spi_flash.h b/include/spi_flash.h
index 3b6a44e..50a03bf 100644
--- a/include/spi_flash.h
+++ b/include/spi_flash.h
@@ -38,6 +38,8 @@ struct spi_flash {
 	u32		page_size;
 	/* Erase (sector) size */
 	u32		sector_size;
+	/* Bank cmds - cmd[0] - read, cmd[1] - write */
+	u8		bank_cmd[2];
 
 	void *memory_map;	/* Address of read-only SPI flash access */
 	int		(*read)(struct spi_flash *flash, u32 offset,
-- 
1.8.3