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drivers: spi_nor: support Microchip SPI flash global unblock

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Microchip SPI flash require Global unblock command before writing
is allowed.

Signed-off-by: Timo Teräs <timo.teras@iki.fi>
This commit is contained in:
Timo Teräs 2019-07-06 19:50:34 +03:00 • committed by Carles Cufí
commit 52453082f8
2 changed files with 7 additions and 0 deletions
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6
drivers/flash/spi_nor.c
View file

@ -290,6 +290,12 @@ static int spi_nor_write_protection_set(struct device *dev, bool write_protect)
ret = spi_nor_cmd_write(dev, (write_protect) ?
SPI_NOR_CMD_WRDI : SPI_NOR_CMD_WREN);
#if DT_INST_0_JEDEC_SPI_NOR_JEDEC_ID_0 == 0xbf && DT_INST_0_JEDEC_SPI_NOR_JEDEC_ID_1 == 0x26
if (ret == 0 && !write_protect) {
ret = spi_nor_cmd_write(dev, SPI_NOR_CMD_MCHP_UNLOCK);
}
#endif
SYNC_UNLOCK();
return ret;

1
drivers/flash/spi_nor.h
View file

@ -38,6 +38,7 @@ struct spi_nor_config {
#define SPI_NOR_CMD_BE 0xD8 /* Block erase */
#define SPI_NOR_CMD_CE 0xC7 /* Chip erase */
#define SPI_NOR_CMD_RDID 0x9F /* Read JEDEC ID */
#define SPI_NOR_CMD_MCHP_UNLOCK 0x98 /* Microchip: Global unblock */
/* Page, sector, and block size are standard, not configurable. */
#define SPI_NOR_PAGE_SIZE 0x0100U