diff options
Diffstat (limited to 'drivers/mtd/spi/spi_flash.c')
| -rw-r--r-- | drivers/mtd/spi/spi_flash.c | 62 |
1 files changed, 60 insertions, 2 deletions
diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c index e4b8ce9..d9124c5 100644 --- a/drivers/mtd/spi/spi_flash.c +++ b/drivers/mtd/spi/spi_flash.c @@ -111,6 +111,37 @@ static int write_cr(struct spi_flash *flash, u8 wc) } #endif +#ifdef CONFIG_SPI_FLASH_STMICRO +static int read_evcr(struct spi_flash *flash, u8 *evcr) +{ + int ret; + const u8 cmd = CMD_READ_EVCR; + + ret = spi_flash_read_common(flash, &cmd, 1, evcr, 1); + if (ret < 0) { + debug("SF: error reading EVCR\n"); + return ret; + } + + return 0; +} + +static int write_evcr(struct spi_flash *flash, u8 evcr) +{ + u8 cmd; + int ret; + + cmd = CMD_WRITE_EVCR; + ret = spi_flash_write_common(flash, &cmd, 1, &evcr, 1); + if (ret < 0) { + debug("SF: error while writing EVCR register\n"); + return ret; + } + + return 0; +} +#endif + #ifdef CONFIG_SPI_FLASH_BAR static int spi_flash_write_bar(struct spi_flash *flash, u32 offset) { @@ -843,6 +874,34 @@ static int spansion_quad_enable(struct spi_flash *flash) } #endif +#ifdef CONFIG_SPI_FLASH_STMICRO +static int micron_quad_enable(struct spi_flash *flash) +{ + u8 qeb_status; + int ret; + + ret = read_evcr(flash, &qeb_status); + if (ret < 0) + return ret; + + if (!(qeb_status & STATUS_QEB_MICRON)) + return 0; + + ret = write_evcr(flash, qeb_status & ~STATUS_QEB_MICRON); + if (ret < 0) + return ret; + + /* read EVCR and check it */ + ret = read_evcr(flash, &qeb_status); + if (!(ret >= 0 && !(qeb_status & STATUS_QEB_MICRON))) { + printf("SF: Micron EVCR Quad bit not clear\n"); + return -EINVAL; + } + + return ret; +} +#endif + static int set_quad_mode(struct spi_flash *flash, u8 idcode0) { switch (idcode0) { @@ -857,8 +916,7 @@ static int set_quad_mode(struct spi_flash *flash, u8 idcode0) #endif #ifdef CONFIG_SPI_FLASH_STMICRO case SPI_FLASH_CFI_MFR_STMICRO: - debug("SF: QEB is volatile for %02x flash\n", idcode0); - return 0; + return micron_quad_enable(flash); #endif default: printf("SF: Need set QEB func for %02x flash\n", idcode0); |