From patchwork Thu Jan 3 14:51:55 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [U-Boot,PATH,v3,2/2] sf: Add config register reading support Date: Thu, 03 Jan 2013 04:51:55 -0000 From: Jagan Teki X-Patchwork-Id: 209263 Message-Id: <1357224715-26885-2-git-send-email-jagannadh.teki@gmail.com> To: u-boot@lists.denx.de This patch provides support to read a flash config register. Config register contains a control bits used to verify the different configurations and security features of a device. User need to get the data through spi_flash_cmd_read_config() based on their usage. Signed-off-by: Jagannadha Sutradharudu Teki --- Changes in v3: improved coding style drivers/mtd/spi/spi_flash.c | 8 ++++++++ drivers/mtd/spi/spi_flash_internal.h | 4 ++++ 2 files changed, 12 insertions(+), 0 deletions(-) diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c index b4d726e..fdae94d 100644 --- a/drivers/mtd/spi/spi_flash.c +++ b/drivers/mtd/spi/spi_flash.c @@ -307,6 +307,14 @@ int spi_flash_cmd_write_config(struct spi_flash *flash, u8 cr) return 0; } +int spi_flash_cmd_read_config(struct spi_flash *flash, void *data) +{ + u8 cmd; + + cmd = CMD_READ_CONFIG; + return spi_flash_read_common(flash, &cmd, sizeof(cmd), (void *)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 825b398..844e82e 100644 --- a/drivers/mtd/spi/spi_flash_internal.h +++ b/drivers/mtd/spi/spi_flash_internal.h @@ -22,6 +22,7 @@ #define CMD_PAGE_PROGRAM 0x02 #define CMD_WRITE_DISABLE 0x04 #define CMD_READ_STATUS 0x05 +#define CMD_READ_CONFIG 0x35 #define CMD_WRITE_ENABLE 0x06 #define CMD_ERASE_4K 0x20 #define CMD_ERASE_32K 0x52 @@ -83,6 +84,9 @@ int spi_flash_cmd_read_status(struct spi_flash *flash, void *data); /* Program the config register. */ int spi_flash_cmd_write_config(struct spi_flash *flash, u8 cr); +/* Read the config register */ +int spi_flash_cmd_read_config(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.