mtd: spi-nor: Fix whole chip erasing for stacked chips.

Currently it is possible to disable chip erase for spi-nor driver.
Some modern stacked (multi die) flash chips do not support chip
erase opcode at all but spi-nor framework needs to cope with them too.
This commit extends existing functionality to allow disable
chip erase for a single flash chip.

Signed-off-by: Marcin Krzeminski <mar.krzeminski@gmail.com>
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 561e46de8faa99a23296eef6636627dd4f73c81d..c29a3516bf04d24948b7a3e309434212d2ff7c7d 100644 (file)
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -85,6 +85,7 @@ struct flash_info {
                                         * Use dedicated 4byte address op codes
                                         * to support memory size above 128Mib.
                                         */
+#define NO_CHIP_ERASE          BIT(12) /* Chip does not support chip erase */
 };
 
 #define JEDEC_MFR(info)        ((info)->id[0])
@@ -1631,6 +1632,8 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
                nor->flags |= SNOR_F_USE_FSR;
        if (info->flags & SPI_NOR_HAS_TB)
                nor->flags |= SNOR_F_HAS_SR_TB;
+       if (info->flags & NO_CHIP_ERASE)
+               nor->flags |= SNOR_F_NO_OP_CHIP_ERASE;
 
 #ifdef CONFIG_MTD_SPI_NOR_USE_4K_SECTORS
        /* prefer "small sector" erase if possible */