Some old STMicro parts do not support JEDEC ID (0x9f). This patch
uses RES (0xab) to get Electronic ID and translates it to JEDEC ID.
Signed-off-by: Thomas Chou <tho...@wytron.com.tw>
---
drivers/mtd/spi/spi_flash.c | 12 ++++++++++++
drivers/mtd/spi/stmicro.c | 8 ++++++++
2 files changed, 20 insertions(+), 0 deletions(-)
diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index 612f819..8986879 100644
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -120,6 +120,18 @@ struct spi_flash *spi_flash_probe(unsigned int bus,
unsigned int cs,
ret = spi_flash_cmd(spi, CMD_READ_ID, &idcode, sizeof(idcode));
if (ret)
goto err_read_id;
+#ifdef CONFIG_SPI_FLASH_STMICRO
+ if (idcode[0] == 0xff) { /* try RES to read electronic id */
+ ret = spi_flash_cmd(spi, 0xab, &idcode, sizeof(idcode));
+ if (ret)
+ goto err_read_id;
+ if ((idcode[3] & 0xf0) == 0x10) {
+ idcode[0] = 0x20;
+ idcode[1] = 0x20;
+ idcode[2] = idcode[3] + 1;
+ }
+ }
+#endif
debug("SF: Got idcode %02x %02x %02x %02x %02x\n", idcode[0],
idcode[1], idcode[2], idcode[3], idcode[4]);
diff --git a/drivers/mtd/spi/stmicro.c b/drivers/mtd/spi/stmicro.c
index ae0d047..bdb49da 100644
--- a/drivers/mtd/spi/stmicro.c
+++ b/drivers/mtd/spi/stmicro.c
@@ -46,6 +46,7 @@
#define CMD_M25PXX_DP 0xb9 /* Deep Power-down */
#define CMD_M25PXX_RES 0xab /* Release from DP, and Read Signature
*/
+#define STM_ID_M25P10 0x11
#define STM_ID_M25P16 0x15
#define STM_ID_M25P20 0x12
#define STM_ID_M25P32 0x16
@@ -78,6 +79,13 @@ static inline struct stmicro_spi_flash
*to_stmicro_spi_flash(struct spi_flash
static const struct stmicro_spi_flash_params stmicro_spi_flash_table[] = {
{
+ .idcode1 = STM_ID_M25P10,
+ .page_size = 256,
+ .pages_per_sector = 128,
+ .nr_sectors = 4,
+ .name = "M25P10",
+ },
+ {
.idcode1 = STM_ID_M25P16,
.page_size = 256,
.pages_per_sector = 256,
--
1.6.6.1
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