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

Thomas Chou
2010-04-30T13:11:20Z

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@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