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| author | Jagannadha Sutradharudu Teki <jaganna@xilinx.com> | 2013-12-26 13:54:57 +0530 |
|---|---|---|
| committer | Jagannadha Sutradharudu Teki <jaganna@xilinx.com> | 2014-01-11 15:13:26 +0530 |
| commit | d08a1baf617a8b7f1959c6b24c1ee7590a0c06a5 (patch) | |
| tree | cc3d76e62567f51f9051d3aabd224689a7bd17b8 /drivers/mtd/spi/sf_probe.c | |
| parent | 6cba6fdf96f13a0533187b9c16608d9ca44add40 (diff) | |
| download | talos-obmc-uboot-d08a1baf617a8b7f1959c6b24c1ee7590a0c06a5.tar.gz talos-obmc-uboot-d08a1baf617a8b7f1959c6b24c1ee7590a0c06a5.zip | |
sf: Set quad enable bit support
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.
Currently added set quad enable bit for winbond and spansion flash
devices. stmicro flash doesn't require to set as qeb is volatile.
remaining flash devices support will add in future patches.
Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Diffstat (limited to 'drivers/mtd/spi/sf_probe.c')
| -rw-r--r-- | drivers/mtd/spi/sf_probe.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/mtd/spi/sf_probe.c b/drivers/mtd/spi/sf_probe.c index 3fa7363da3..8b2972c7aa 100644 --- a/drivers/mtd/spi/sf_probe.c +++ b/drivers/mtd/spi/sf_probe.c @@ -165,6 +165,25 @@ static u8 spi_read_cmds_array[] = { CMD_READ_QUAD_OUTPUT_FAST, }; +static int spi_flash_set_qeb(struct spi_flash *flash, u8 idcode0) +{ + switch (idcode0) { +#if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND) + case SPI_FLASH_CFI_MFR_SPANSION: + case SPI_FLASH_CFI_MFR_WINBOND: + return spi_flash_set_qeb_winspan(flash); +#endif +#ifdef CONFIG_SPI_FLASH_STMICRO + case SPI_FLASH_CFI_MFR_STMICRO: + debug("SF: QEB is volatile for %02x flash\n", idcode0); + return 0; +#endif + default: + printf("SF: Need set QEB func for %02x flash\n", idcode0); + return -1; + } +} + static struct spi_flash *spi_flash_validate_params(struct spi_slave *spi, u8 *idcode) { @@ -250,6 +269,15 @@ static struct spi_flash *spi_flash_validate_params(struct spi_slave *spi, /* Go for default supported write cmd */ flash->write_cmd = CMD_PAGE_PROGRAM; + /* 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, idcode[0])) { + debug("SF: Fail to set QEB for %02x\n", idcode[0]); + return NULL; + } + } + /* Poll cmd seclection */ flash->poll_cmd = CMD_READ_STATUS; #ifdef CONFIG_SPI_FLASH_STMICRO |
