[U-Boot] [PATCH 5/6 v2] 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.
This is needed to support the SPI flash chip on Altera EP1C20 board.

Signed-off-by: Thomas Chou <thomas at wytron.com.tw>
---
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:
 		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