From: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Date: Sat, 5 Jan 2013 13:44:36 +0000 (+0530)
Subject: sf: Add bank address register reading support
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=e6ac9ae6cbb86e5b8a2aa78b1e49cd684b71a029;p=thirdparty%2Fu-boot.git

sf: Add bank address register reading support

This patch provides support to read a flash bank address register.

reading bank address register will give whether the flash is operated
on bank addressing or normal addressing(3-byte address mode).

Currently added bank address register reading support for
spansion flashes.

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 39f85a89801..90c51c7110d 100644
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -312,6 +312,14 @@ int spi_flash_cmd_bankaddr_write(struct spi_flash *flash, u8 ear)
 	return 0;
 }
 
+int spi_flash_cmd_bankaddr_read(struct spi_flash *flash, void *data)
+{
+	u8 cmd;
+
+	cmd = CMD_BANKADDR_BRRD;
+	return spi_flash_read_common(flash, &cmd, 1, data, 1);
+}
+
 /*
  * The following table holds all device probe functions
  *
diff --git a/drivers/mtd/spi/spi_flash_internal.h b/drivers/mtd/spi/spi_flash_internal.h
index d507fd28625..bb22f5cd8d6 100644
--- a/drivers/mtd/spi/spi_flash_internal.h
+++ b/drivers/mtd/spi/spi_flash_internal.h
@@ -30,6 +30,7 @@
 
 /* Bank addr acess commands */
 #define CMD_BANKADDR_BRWR		0x17
+#define CMD_BANKADDR_BRRD		0x16
 
 /* Common status */
 #define STATUS_WIP			0x01
@@ -83,6 +84,9 @@ 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 ear);
 
+/* Read the bank address register */
+int spi_flash_cmd_bankaddr_read(struct spi_flash *flash, void *data);
+
 /*
  * Same as spi_flash_cmd_read() except it also claims/releases the SPI
  * bus. Used as common part of the ->read() operation.