Messages in this thread Patch in this message | | | From | Anurag Kumar Vulisha <> | Subject | [PATCH] mtd: spi-nor: Add Global Block-Protection Unlock support for SST flash parts | Date | Fri, 13 Nov 2015 18:02:38 +0530 |
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This patch adds Global block protection unlock support for SST flash parts
Signed-off-by: Anurag Kumar Vulisha <anuragku@xilinx.com> --- drivers/mtd/spi-nor/spi-nor.c | 8 ++++++++ include/linux/mtd/spi-nor.h | 1 + 2 files changed, 9 insertions(+)
diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c index 4988390..787ab95 100644 --- a/drivers/mtd/spi-nor/spi-nor.c +++ b/drivers/mtd/spi-nor/spi-nor.c @@ -68,6 +68,8 @@ struct flash_info { #define SPI_NOR_DUAL_READ 0x20 /* Flash supports Dual Read */ #define SPI_NOR_QUAD_READ 0x40 /* Flash supports Quad Read */ #define USE_FSR 0x80 /* use flag status register */ +/* Unlock the Global protection for sst flashes */ +#define SST_GLOBAL_PROT_UNLK 0x100 }; #define JEDEC_MFR(info) ((info)->id[0]) @@ -1204,6 +1206,12 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode) JEDEC_MFR(info) == SNOR_MFR_WINBOND) { write_enable(nor); write_sr(nor, 0); + + if (info->flags & SST_GLOBAL_PROT_UNLK) { + write_enable(nor); + /* Unlock global write protection bits */ + nor->write_reg(nor, GLOBAL_BLKPROT_UNLK, NULL, 0); + } } if (!mtd->name) diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h index c8723b6..37e1abf 100644 --- a/include/linux/mtd/spi-nor.h +++ b/include/linux/mtd/spi-nor.h @@ -65,6 +65,7 @@ #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 GLOBAL_BLKPROT_UNLK 0x98 /* Clear global write protection bits */ /* Used for Macronix and Winbond flashes. */ #define SPINOR_OP_EN4B 0xb7 /* Enter 4-byte mode */ -- 2.1.2
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