Re: [U-Boot] [PATCH] Revert "spi: add config option to enable the WP pin function on st micron flashes"

On 18 December 2014 at 19:21, Jagannadha Sutradharudu Teki jagannadh.teki@gmail.com wrote:

This reverts commit 562f8df18da62ae02c4ace1e530451fe82c3312d.

Never see the issue with N25Q128 flash without need of W#/Vpp signal during probe.

Signed-off-by: Jagannadha Sutradharudu Teki jagannadh.teki@gmail.com Cc: Heiko Schocher hs@denx.de

---

README | 11 ----------- drivers/mtd/spi/sf_internal.h | 4 ---- drivers/mtd/spi/sf_probe.c | 30 ------------------------------ 3 files changed, 45 deletions(-)

diff --git a/README b/README index 4ca04d0..908646f 100644 --- a/README +++ b/README @@ -3090,17 +3090,6 @@ CBFS (Coreboot Filesystem) support memories can be connected with a given cs line. currently Xilinx Zynq qspi support these type of connections.

•           CONFIG_SYS_SPI_ST_ENABLE_WP_PIN
  

•           enable the W#/Vpp signal to disable writing to the status
  

•           register on ST MICRON flashes like the N25Q128.
  

•           The status register write enable/disable bit, combined with
  

•           the W#/VPP signal provides hardware data protection for the
  

•           device as follows: When the enable/disable bit is set to 1,
  

•           and the W#/VPP signal is driven LOW, the status register
  

•           nonvolatile bits become read-only and the WRITE STATUS REGISTER
  

•           operation will not execute. The only way to exit this
  

•           hardware-protected mode is to drive W#/VPP HIGH.
  

• SystemACE Support: CONFIG_SYSTEMACE

diff --git a/drivers/mtd/spi/sf_internal.h b/drivers/mtd/spi/sf_internal.h index 785f7a9..bd834dc 100644 --- a/drivers/mtd/spi/sf_internal.h +++ b/drivers/mtd/spi/sf_internal.h @@ -97,10 +97,6 @@ enum { #define STATUS_QEB_MXIC (1 << 6) #define STATUS_PEC (1 << 7)

-#ifdef CONFIG_SYS_SPI_ST_ENABLE_WP_PIN -#define STATUS_SRWD (1 << 7) /* SR write protect */ -#endif

/* Flash timeout values */ #define SPI_FLASH_PROG_TIMEOUT (2 * CONFIG_SYS_HZ) #define SPI_FLASH_PAGE_ERASE_TIMEOUT (5 * CONFIG_SYS_HZ) diff --git a/drivers/mtd/spi/sf_probe.c b/drivers/mtd/spi/sf_probe.c index ce9987f..3b0e652 100644 --- a/drivers/mtd/spi/sf_probe.c +++ b/drivers/mtd/spi/sf_probe.c @@ -287,34 +287,6 @@ 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

/**

• spi_flash_probe_slave() - Probe for a SPI flash device on a bus

@@ -393,8 +365,6 @@ int spi_flash_probe_slave(struct spi_slave *spi, struct spi_flash *flash) 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);
  

-- 1.9.1

Ping!

thanks!