diff options
| author | Heiko Schocher <hs@denx.de> | 2014-07-18 04:07:21 (GMT) |
|---|---|---|
| committer | Stefano Babic <sbabic@denx.de> | 2014-07-23 10:26:45 (GMT) |
| commit | 562f8df18da62ae02c4ace1e530451fe82c3312d (patch) | |
| tree | f3ac604fb5cc1a3865a91a99763f3d855c19bd4f /drivers/mtd/spi/sf_probe.c | |
| parent | a0ae0091d783b1140f8d321d8c6d221aeb0d39d0 (diff) | |
| download | u-boot-562f8df18da62ae02c4ace1e530451fe82c3312d.tar.xz | |
spi: add config option to enable the WP pin function on st micron flashes
enable the W#/Vpp signal to disable writing to the status
register on ST MICRON flashes like the N25Q128 thorugh
the new config option CONFIG_SYS_SPI_ST_ENABLE_WP_PIN
Signed-off-by: Heiko Schocher <hs@denx.de>
Cc: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
Diffstat (limited to 'drivers/mtd/spi/sf_probe.c')
| -rw-r--r-- | drivers/mtd/spi/sf_probe.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/mtd/spi/sf_probe.c b/drivers/mtd/spi/sf_probe.c index 36ae5e0..4d148d1 100644 --- a/drivers/mtd/spi/sf_probe.c +++ b/drivers/mtd/spi/sf_probe.c @@ -281,6 +281,34 @@ int spi_flash_decode_fdt(const void *blob, struct spi_flash *flash) } #endif /* CONFIG_OF_CONTROL */ +#ifdef CONFIG_SYS_SPI_ST_ENABLE_WP_PIN +/* enable the W#/Vpp signal to disable writing to the status register */ +static int spi_enable_wp_pin(struct spi_flash *flash) +{ + u8 status; + int ret; + + ret = spi_flash_cmd_read_status(flash, &status); + if (ret < 0) + return ret; + + ret = spi_flash_cmd_write_status(flash, STATUS_SRWD); + if (ret < 0) + return ret; + + ret = spi_flash_cmd_write_disable(flash); + if (ret < 0) + return ret; + + return 0; +} +#else +static int spi_enable_wp_pin(struct spi_flash *flash) +{ + return 0; +} +#endif + static struct spi_flash *spi_flash_probe_slave(struct spi_slave *spi) { struct spi_flash *flash = NULL; @@ -351,6 +379,8 @@ static struct spi_flash *spi_flash_probe_slave(struct spi_slave *spi) puts(" Full access #define CONFIG_SPI_FLASH_BAR\n"); } #endif + if (spi_enable_wp_pin(flash)) + puts("Enable WP pin failed\n"); /* Release spi bus */ spi_release_bus(spi); |