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authorJagannadha Sutradharudu Teki <jaganna@xilinx.com>2013-06-13 20:37:19 +0530
committerJagannadha Sutradharudu Teki <jaganna@xilinx.com>2013-06-23 22:02:49 +0530
commitc9fcb59d7db74b93df9ee0a830bb9f43888f195c (patch)
tree4747a45dda77b26399fba6aec52c92e2d526c61b
parent9675fed4742338c71678cd310d0d6922b56e490a (diff)
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sf: Add bank address register writing support
This patch provides support to program a flash bank address register. extended/bank address register contains an information to access the 4th byte addressing in 3-byte address mode. reff' the spec for more details about bank addr register in Page-63, Table 8.16 http://www.spansion.com/Support/Datasheets/S25FL128S_256S_00.pdf Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com> Reviewed-by: Simon Glass <sjg@chromium.org>
-rw-r--r--drivers/mtd/spi/spi_flash.c26
-rw-r--r--drivers/mtd/spi/spi_flash_internal.h3
2 files changed, 29 insertions, 0 deletions
diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index 0e38f59..9ddd070 100644
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -278,6 +278,32 @@ int spi_flash_cmd_write_status(struct spi_flash *flash, u8 sr)
return 0;
}
+int spi_flash_cmd_bankaddr_write(struct spi_flash *flash, u8 bank_sel)
+{
+ u8 cmd;
+ int ret;
+
+ ret = spi_flash_cmd_write_enable(flash);
+ if (ret < 0) {
+ debug("SF: enabling write failed\n");
+ return ret;
+ }
+
+ ret = spi_flash_cmd_write(flash->spi, &cmd, 1, &bank_sel, 1);
+ if (ret) {
+ debug("SF: fail to write bank addr register\n");
+ return ret;
+ }
+
+ ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
+ if (ret < 0) {
+ debug("SF: write bank addr register timed out\n");
+ return ret;
+ }
+
+ 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 141cfa8..772fef6 100644
--- a/drivers/mtd/spi/spi_flash_internal.h
+++ b/drivers/mtd/spi/spi_flash_internal.h
@@ -77,6 +77,9 @@ static inline int spi_flash_cmd_write_disable(struct spi_flash *flash)
/* Program the status register. */
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);
+
/*
* Same as spi_flash_cmd_read() except it also claims/releases the SPI
* bus. Used as common part of the ->read() operation.