sf: Discover the bank addr commands

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@xilinx.com>

diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index 9ddd070..7e19953 100644 (file)
--- 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_read_cmd = CMD_BANKADDR_BRRD;
+               flash->bank_write_cmd = CMD_BANKADDR_BRWR;
+               break;
+       case SPI_FLASH_STMICRO_IDCODE0:
+       case SPI_FLASH_WINBOND_IDCODE0:
+               flash->bank_read_cmd = CMD_EXTNADDR_RDEAR;
+               flash->bank_write_cmd = 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 (file)
--- 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..38587c2 100644 (file)
--- a/include/spi_flash.h
+++ b/include/spi_flash.h
@@ -38,6 +38,10 @@ struct spi_flash {
        u32             page_size;
        /* Erase (sector) size */
        u32             sector_size;
+       /* Bank read cmd */
+       u8              bank_read_cmd;
+       /* Bank write cmd */
+       u8              bank_write_cmd;
 
        void *memory_map;       /* Address of read-only SPI flash access */
        int             (*read)(struct spi_flash *flash, u32 offset,