This patch provides support to read a flash extended address register.
reading extended/bank address register will give whether the flash is operated on extended addressing or normal addressing in 3-byte address mode.
Currently added an extended/bank address register reading support for spansion flashes.
Signed-off-by: Jagannadha Sutradharudu Teki jaganna@xilinx.com --- drivers/mtd/spi/spi_flash.c | 23 +++++++++++++++++++++++ drivers/mtd/spi/spi_flash_internal.h | 4 ++++ 2 files changed, 27 insertions(+), 0 deletions(-)
diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c index 232ccc0..c168c1c 100644 --- a/drivers/mtd/spi/spi_flash.c +++ b/drivers/mtd/spi/spi_flash.c @@ -310,6 +310,29 @@ int spi_flash_cmd_extaddr_write(struct spi_flash *flash, u8 ear) return 0; }
+int spi_flash_cmd_extaddr_read(struct spi_flash *flash, void *data) +{ + u8 cmd; + u8 idcode0; + int ret; + + ret = spi_flash_cmd(flash->spi, CMD_READ_ID, &idcode0, 1); + if (ret) { + debug("SF: fail to read read id\n"); + return ret; + } + + if (idcode0 == 0x01) + cmd = CMD_EXT_BRRD; + else { + printf("SF: unable to support extended addr reg read" + " for %s flash\n", flash->name); + return -1; + } + + 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 dbceb81..65960ad 100644 --- a/drivers/mtd/spi/spi_flash_internal.h +++ b/drivers/mtd/spi/spi_flash_internal.h @@ -30,6 +30,7 @@
/* Extended addr acess commands */ #define CMD_EXT_BRWR 0x17 +#define CMD_EXT_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 extended address register */ int spi_flash_cmd_extaddr_write(struct spi_flash *flash, u8 ear);
+/* Read the extended address register */ +int spi_flash_cmd_extaddr_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.