[U-Boot] [PATCH 5/6 v3] spi_flash: support old STMicro parts with RES

[Thomas Chou]

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 <thomas at wytron.com.tw>
---
v3: add comment as Mike suggested for 0xff id switch.
v2: move the logic to stmicro's probe function

 drivers/mtd/spi/spi_flash.c |    1 +
 drivers/mtd/spi/stmicro.c   |   21 +++++++++++++++++++++
 2 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
index 612f819..c8e4bdd 100644
--- a/drivers/mtd/spi/spi_flash.c
+++ b/drivers/mtd/spi/spi_flash.c
@@ -147,6 +147,7 @@ struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs,
 #endif
 #ifdef CONFIG_SPI_FLASH_STMICRO
 	case 0x20:
+	case 0xff: /* Let the stmicro func handle non-JEDEC ids */
 		flash = spi_flash_probe_stmicro(spi, idcode);
 		break;
 #endif
diff --git a/drivers/mtd/spi/stmicro.c b/drivers/mtd/spi/stmicro.c
index ae0d047..21e9b00 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,
@@ -316,6 +324,19 @@ struct spi_flash *spi_flash_probe_stmicro(struct spi_slave *spi, u8 * idcode)
 	struct stmicro_spi_flash *stm;
 	unsigned int i;
 
+	if (idcode[0] == 0xff) {
+		i = spi_flash_cmd(spi, CMD_M25PXX_RES,
+				  idcode, 4);
+		if (i)
+			return NULL;
+		if ((idcode[3] & 0xf0) == 0x10) {
+			idcode[0] = 0x20;
+			idcode[1] = 0x20;
+			idcode[2] = idcode[3] + 1;
+		} else
+			return NULL;
+	}
+
 	for (i = 0; i < ARRAY_SIZE(stmicro_spi_flash_table); i++) {
 		params = &stmicro_spi_flash_table[i];
 		if (params->idcode1 == idcode[2]) {
-- 
1.6.6.1