From 051fde35f52c2850537a0355213f0d96e99486df Mon Sep 17 00:00:00 2001 From: Jagannadha Sutradharudu Teki Date: Tue, 20 Aug 2013 12:43:42 +0530 Subject: [PATCH] sf: Add configuration register writing support This patch provides support to program a flash config register. Configuration register contains the control bits used to configure the different configurations and security features of a device. User need to set these bits through spi_flash_cmd_write_config() based on their usage. Signed-off-by: Jagannadha Sutradharudu Teki --- drivers/mtd/spi/spi_flash.c | 23 +++++++++++++++++++++++ drivers/mtd/spi/spi_flash_internal.h | 3 +++ 2 files changed, 26 insertions(+) diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c index 93a9479bc76..baed29b7957 100644 --- a/drivers/mtd/spi/spi_flash.c +++ b/drivers/mtd/spi/spi_flash.c @@ -384,6 +384,29 @@ int spi_flash_cmd_write_status(struct spi_flash *flash, u8 sr) return 0; } +int spi_flash_cmd_write_config(struct spi_flash *flash, u8 cr) +{ + u8 cmd, data[2]; + int ret; + + cmd = CMD_READ_STATUS; + ret = spi_flash_read_common(flash, &cmd, 1, &data[0], 1); + if (ret < 0) { + debug("SF: fail to read status register\n"); + return ret; + } + + cmd = CMD_WRITE_STATUS; + data[1] = cr; + ret = spi_flash_write_common(flash, &cmd, 1, &data, 2); + if (ret < 0) { + debug("SF: fail to write config register\n"); + return ret; + } + + return 0; +} + #ifdef CONFIG_SPI_FLASH_BAR int spi_flash_cmd_bankaddr_write(struct spi_flash *flash, u8 bank_sel) { diff --git a/drivers/mtd/spi/spi_flash_internal.h b/drivers/mtd/spi/spi_flash_internal.h index af1afa96c9d..1f105258b78 100644 --- a/drivers/mtd/spi/spi_flash_internal.h +++ b/drivers/mtd/spi/spi_flash_internal.h @@ -94,6 +94,9 @@ 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 config register */ +int spi_flash_cmd_write_config(struct spi_flash *flash, u8 cr); + #ifdef CONFIG_SPI_FLASH_BAR /* Program the bank address register */ int spi_flash_cmd_bankaddr_write(struct spi_flash *flash, u8 bank_sel); -- 2.47.3