From 6cba6fdf96f13a0533187b9c16608d9ca44add40 Mon Sep 17 00:00:00 2001 From: Jagannadha Sutradharudu Teki Date: Mon, 23 Dec 2013 15:47:48 +0530 Subject: sf: ops: 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. Signed-off-by: Jagannadha Sutradharudu Teki --- drivers/mtd/spi/sf_ops.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'drivers/mtd') diff --git a/drivers/mtd/spi/sf_ops.c b/drivers/mtd/spi/sf_ops.c index 3d304ce..39e06ec 100644 --- a/drivers/mtd/spi/sf_ops.c +++ b/drivers/mtd/spi/sf_ops.c @@ -38,6 +38,30 @@ int spi_flash_cmd_write_status(struct spi_flash *flash, u8 sr) return 0; } +static int spi_flash_cmd_write_config(struct spi_flash *flash, u8 cr) +{ + u8 data[2]; + u8 cmd; + 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) { + debug("SF: fail to write config register\n"); + return ret; + } + + return 0; +} + #ifdef CONFIG_SPI_FLASH_BAR static int spi_flash_cmd_bankaddr_write(struct spi_flash *flash, u8 bank_sel) { -- cgit v1.1