Messages in this thread Patch in this message |  | | From | Cyrille Pitchen <> | Subject | [PATCH v2 9/9] mtd: spi-nor: add support to SST sst26* QSPI memories | Date | Wed, 5 Oct 2016 14:00:40 +0200 |
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This patch adds support to the SST sst26* QSPI memories. It also adds a new SST_BLOCK_PROTECT flag so spi_nor_scan() sends a SST Global Block Protection Unlock (98h) command once for all otherwise later Sector Erase and Page Program commands would fail.
It was tested with sst26vf016b, sst26vf032b, sst26vf032ba and sst26vf064b on a sama5d2 xplained board at 55.3MHz and 3.3V.
sst26wf040b and sst26wf080b were not tested since they are 1.8V memories hence don't fit the sama5d2 xplained board requirements.
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com> --- drivers/mtd/spi-nor/spi-nor.c | 20 ++++++++++++++++++++ include/linux/mtd/spi-nor.h | 1 + 2 files changed, 21 insertions(+)
diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c index 031c6792a3fe..355824bd3587 100644 --- a/drivers/mtd/spi-nor/spi-nor.c +++ b/drivers/mtd/spi-nor/spi-nor.c @@ -81,6 +81,7 @@ struct flash_info { * to support memory size above 128Mib. */ #define SPI_NOR_SKIP_SFDP BIT(11) /* Skip read of SFDP tables */ +#define SST_BLOCK_PROTECT BIT(12) /* use SST Unlock Block-Protection */ }; #define JEDEC_MFR(info) ((info)->id[0]) @@ -999,6 +1000,11 @@ static const struct flash_info spi_nor_ids[] = { { "sst25wf040b", INFO(0x621613, 0, 64 * 1024, 8, SECT_4K) }, { "sst25wf040", INFO(0xbf2504, 0, 64 * 1024, 8, SECT_4K | SST_WRITE) }, { "sst25wf080", INFO(0xbf2505, 0, 64 * 1024, 16, SECT_4K | SST_WRITE) }, + { "sst26vf016b", INFO(0xbf2641, 0, 64 * 1024, 32, SECT_4K | SST_BLOCK_PROTECT) }, + { "sst26vf032b", INFO(0xbf2642, 0, 64 * 1024, 64, SECT_4K | SST_BLOCK_PROTECT) }, + { "sst26vf064b", INFO(0xbf2643, 0, 64 * 1024, 128, SECT_4K | SST_BLOCK_PROTECT) }, + { "sst26wf040b", INFO(0xbf2654, 0, 64 * 1024, 8, SECT_4K | SST_BLOCK_PROTECT) }, + { "sst26wf080b", INFO(0xbf2658, 0, 64 * 1024, 16, SECT_4K | SST_BLOCK_PROTECT) }, /* ST Microelectronics -- newer production may have feature updates */ { "m25p05", INFO(0x202010, 0, 32 * 1024, 2, 0) }, @@ -1135,6 +1141,14 @@ static int spi_nor_read(struct mtd_info *mtd, loff_t from, size_t len, return ret; } +static int sst_unlock_block_protection(struct spi_nor *nor) +{ + int ret; + + ret = write_enable(nor); + return ret ? ret : nor->write_reg(nor, SPINOR_OP_ULBPR, NULL, 0); +} + static int sst_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf) { @@ -2308,6 +2322,12 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, return -EINVAL; } + if (info->flags & SST_BLOCK_PROTECT) { + ret = sst_unlock_block_protection(nor); + if (ret) + return ret; + } + dev_info(dev, "%s (%lld Kbytes)\n", info->name, (long long)mtd->size >> 10); diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h index ede7ad83c9c5..016b6c51e854 100644 --- a/include/linux/mtd/spi-nor.h +++ b/include/linux/mtd/spi-nor.h @@ -80,6 +80,7 @@ #define SPINOR_OP_BP 0x02 /* Byte program */ #define SPINOR_OP_WRDI 0x04 /* Write disable */ #define SPINOR_OP_AAI_WP 0xad /* Auto address increment word program */ +#define SPINOR_OP_ULBPR 0x98 /* Global Block Protection Unlock */ /* Used for Macronix and Winbond flashes. */ #define SPINOR_OP_EN4B 0xb7 /* Enter 4-byte mode */ -- 2.7.4
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