Patchwork [U-Boot,v4,33/36] sf: ops: Add configuration register writing support

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Submitter Jagannadha Sutradharudu Teki
Date Sept. 24, 2013, 6:20 p.m.
Message ID <6f337c50-c944-4cf4-8788-42ec7fb2ca37@VA3EHSMHS031.ehs.local>
Download mbox | patch
Permalink /patch/277594/
State Superseded
Delegated to: Jagannadha Sutradharudu Teki
Headers show

Comments

Jagannadha Sutradharudu Teki - Sept. 24, 2013, 6:20 p.m.
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 <jaganna@xilinx.com>
---
Changes for v4:
        - none
Changes for v3:
        - none
Changes for v2:
        - none

 drivers/mtd/spi/spi_flash_ops.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

Patch

diff --git a/drivers/mtd/spi/spi_flash_ops.c b/drivers/mtd/spi/spi_flash_ops.c
index 59127f8..2f87801 100644
--- a/drivers/mtd/spi/spi_flash_ops.c
+++ b/drivers/mtd/spi/spi_flash_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)
 {