This patch provides support to set the quad enable bit on flash.
quad enable bit needs to set before performing any quad IO
operations on respective SPI flashes.
Signed-off-by: Jagannadha Sutradharudu Teki <jaga...@xilinx.com>
---
Changes for v4:
- none
Changes for v3:
- none
Changes for v2:
- none
drivers/mtd/spi/spi_flash_internal.h | 5 +++++
drivers/mtd/spi/spi_flash_ops.c | 24 ++++++++++++++++++++++++
drivers/mtd/spi/spi_flash_probe.c | 9 +++++++++
3 files changed, 38 insertions(+)
diff --git a/drivers/mtd/spi/spi_flash_internal.h
b/drivers/mtd/spi/spi_flash_internal.h
index 1f9f170..a346ae6 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_FLAG_STATUS 0x70
#define CMD_WRITE_ENABLE 0x06
#define CMD_ERASE_4K 0x20
@@ -41,6 +42,7 @@
/* Common status */
#define STATUS_WIP 0x01
+#define STATUS_QEB 0x02
#define STATUS_PEC 0x80
/* Send a single-byte command to the device and read the response */
@@ -94,6 +96,9 @@ 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);
+/* Set quad enbale bit */
+int spi_flash_set_qeb(struct spi_flash *flash);
+
/*
* Same as spi_flash_cmd_read() except it also claims/releases the SPI
* bus. Used as common part of the ->read() operation.
diff --git a/drivers/mtd/spi/spi_flash_ops.c b/drivers/mtd/spi/spi_flash_ops.c
index 2f87801..439490e 100644
--- a/drivers/mtd/spi/spi_flash_ops.c
+++ b/drivers/mtd/spi/spi_flash_ops.c
@@ -62,6 +62,30 @@ static int spi_flash_cmd_write_config(struct spi_flash
*flash, u8 cr)
return 0;
}
+int spi_flash_set_qeb(struct spi_flash *flash)
+{
+ u8 qeb_status;
+ u8 cmd;
+ int ret;
+
+ cmd = CMD_READ_CONFIG;
+ ret = spi_flash_read_common(flash, &cmd, 1, &qeb_status, 1);
+ if (ret < 0) {
+ debug("SF: fail to read config register\n");
+ return ret;
+ }
+
+ if (qeb_status & STATUS_QEB) {
+ debug("SF: Quad enable bit is already set\n");
+ } else {
+ ret = spi_flash_cmd_write_config(flash, STATUS_QEB);
+ if (ret < 0)
+ return ret;
+ }
+
+ return ret;
+}
+
#ifdef CONFIG_SPI_FLASH_BAR
static int spi_flash_cmd_bankaddr_write(struct spi_flash *flash, u8 bank_sel)
{
diff --git a/drivers/mtd/spi/spi_flash_probe.c
b/drivers/mtd/spi/spi_flash_probe.c
index 30ef85c..995af14 100644
--- a/drivers/mtd/spi/spi_flash_probe.c
+++ b/drivers/mtd/spi/spi_flash_probe.c
@@ -237,6 +237,15 @@ struct spi_flash *spi_flash_validate_ids(struct spi_slave
*spi, u8 *idcode)
flash->write_cmd = flash->spi->wr_cmd;
}
+ /* Set the quad enable bit - only for quad commands */
+ if ((flash->read_cmd == CMD_READ_QUAD_OUTPUT_FAST) ||
+ (flash->write_cmd == CMD_QUAD_PAGE_PROGRAM)) {
+ if (spi_flash_set_qeb(flash)) {
+ debug("SF: Fail to set quad enable bit\n");
+ return NULL;
+ }
+ }
+
/* Compute erase sector and command */
if (params->flags & SECT_4K) {
flash->erase_cmd = CMD_ERASE_4K;
--
1.8.3
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