From 74c2cee4e82bb71953267e87900e279ab5aa1dc3 Mon Sep 17 00:00:00 2001 From: Bin Meng Date: Fri, 12 Dec 2014 19:36:13 +0530 Subject: spi: sf: Support byte program for sst spi flash Currently if SST flash advertises SST_WP flag in the params table the word program command (ADh) with auto address increment will be used for the flash write op. However some SPI controllers do not support the word program command (like the Intel ICH 7), the byte programm command (02h) has to be used. Signed-off-by: Bin Meng Acked-by: Simon Glass Tested-by: Simon Glass Reviewed-by: Jagannadha Sutradharudu Teki --- drivers/mtd/spi/sf_internal.h | 2 ++ drivers/mtd/spi/sf_ops.c | 31 +++++++++++++++++++++++++++++++ 2 files changed, 33 insertions(+) (limited to 'drivers') diff --git a/drivers/mtd/spi/sf_internal.h b/drivers/mtd/spi/sf_internal.h index 7218e697a05..fb53cb08347 100644 --- a/drivers/mtd/spi/sf_internal.h +++ b/drivers/mtd/spi/sf_internal.h @@ -110,6 +110,8 @@ enum { int sst_write_wp(struct spi_flash *flash, u32 offset, size_t len, const void *buf); +int sst_write_bp(struct spi_flash *flash, u32 offset, size_t len, + const void *buf); #endif /** diff --git a/drivers/mtd/spi/sf_ops.c b/drivers/mtd/spi/sf_ops.c index 759231f2e34..34bc54e73e1 100644 --- a/drivers/mtd/spi/sf_ops.c +++ b/drivers/mtd/spi/sf_ops.c @@ -517,4 +517,35 @@ int sst_write_wp(struct spi_flash *flash, u32 offset, size_t len, spi_release_bus(flash->spi); return ret; } + +int sst_write_bp(struct spi_flash *flash, u32 offset, size_t len, + const void *buf) +{ + size_t actual; + int ret; + + ret = spi_claim_bus(flash->spi); + if (ret) { + debug("SF: Unable to claim SPI bus\n"); + return ret; + } + + for (actual = 0; actual < len; actual++) { + ret = sst_byte_write(flash, offset, buf + actual); + if (ret) { + debug("SF: sst byte program failed\n"); + break; + } + offset++; + } + + if (!ret) + ret = spi_flash_cmd_write_disable(flash); + + debug("SF: sst: program %s %zu bytes @ 0x%zx\n", + ret ? "failure" : "success", len, offset - actual); + + spi_release_bus(flash->spi); + return ret; +} #endif -- cgit v1.2.3