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 jaganna@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;