From: Hou Zhiqiang B48286@freescale.com
For more than 16MiB Micron chips, there are 3-Byte and 4-Byte address mode, and only the 3-Byte address mode is supported in u-boot. So, reset the SPI flash to 3-Byte address mode in probe to ensure the SPI flash work correctly, because it may be in 4-Byte address mode after warm boot.
Signed-off-by: Hou Zhiqiang B48286@freescale.com --- drivers/mtd/spi/sf_internal.h | 8 ++++++++ drivers/mtd/spi/sf_ops.c | 24 ++++++++++++++++++++++++ drivers/mtd/spi/sf_probe.c | 5 +++++ 3 files changed, 37 insertions(+)
diff --git a/drivers/mtd/spi/sf_internal.h b/drivers/mtd/spi/sf_internal.h index 703d4a7..3d7ed24 100644 --- a/drivers/mtd/spi/sf_internal.h +++ b/drivers/mtd/spi/sf_internal.h @@ -75,6 +75,10 @@ enum { #define CMD_FLAG_STATUS 0x70 #define CMD_CLEAR_FLAG_STATUS 0x50
+/* Used for Macronix and Winbond flashes */ +#define CMD_ENTER_4B_ADDR 0xB7 +#define CMD_EXIT_4B_ADDR 0xE9 + /* Read commands */ #define CMD_READ_ARRAY_SLOW 0x03 #define CMD_READ_ARRAY_FAST 0x0b @@ -227,6 +231,10 @@ int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd, int spi_flash_cmd_read_ops(struct spi_flash *flash, u32 offset, size_t len, void *data);
+#if defined(CONFIG_SPI_FLASH_STMICRO) +int spi_flash_cmd_4B_addr_switch(struct spi_flash *flash, int enable); +#endif + #ifdef CONFIG_SPI_FLASH_MTD int spi_flash_mtd_register(struct spi_flash *flash); void spi_flash_mtd_unregister(void); diff --git a/drivers/mtd/spi/sf_ops.c b/drivers/mtd/spi/sf_ops.c index cbb9f00..1ce14d1 100644 --- a/drivers/mtd/spi/sf_ops.c +++ b/drivers/mtd/spi/sf_ops.c @@ -93,6 +93,30 @@ int spi_flash_cmd_write_config(struct spi_flash *flash, u8 wc) } #endif
+#if defined(CONFIG_SPI_FLASH_STMICRO) +int spi_flash_cmd_4B_addr_switch(struct spi_flash *flash, int enable) +{ + int ret; + u8 cmd; + + cmd = enable ? CMD_ENTER_4B_ADDR : CMD_EXIT_4B_ADDR; + + ret = spi_claim_bus(flash->spi); + if (ret) { + debug("SF: unable to claim SPI bus\n"); + return ret; + } + + ret = spi_flash_cmd_write_enable(flash); + if (ret < 0) { + debug("SF: enabling write failed\n"); + return ret; + } + + return spi_flash_cmd(flash->spi, cmd, NULL, 0); +} +#endif + #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/sf_probe.c b/drivers/mtd/spi/sf_probe.c index e0283dc..5ba7dde 100644 --- a/drivers/mtd/spi/sf_probe.c +++ b/drivers/mtd/spi/sf_probe.c @@ -231,6 +231,11 @@ static int spi_flash_validate_params(struct spi_slave *spi, u8 *idcode, #ifdef CONFIG_SPI_FLASH_STMICRO if (params->flags & E_FSR) flash->poll_cmd = CMD_FLAG_STATUS; + + if (flash->size > SPI_FLASH_16MB_BOUN) { + if (spi_flash_cmd_4B_addr_switch(flash, 0) < 0) + debug("SF: enter 3B address mode failed\n"); + } #endif
/* Configure the BAR - discover bank cmds and read current bank */