Paul Menzel (paulepanter@users.sourceforge.net) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/7077
-gerrit
commit 7756aec4ce55c36f4e1f64ede0c8b4b343cf09a4 Author: Scott Radcliffe sradcliffe@microind.com Date: Tue Oct 14 15:40:59 2014 -0400
drivers/spi: Add support for Micron N25Q128
Support added for Micron N25Q128 SPI flash, which has the same manufacturer id as ST Micro. Jedec ID = 0x20 0xBB 0x18. Since existing stmicro.c only compares the last device id byte, this flash is mistakenly identified as M25P128, which has ID = 0x20 0x20 0x18.
To handle this situation and avoid breaking code for existing devices, a two byte .id member is added. New devices should be added to the beginning of the flash table array with .idcode = STM_ID_USE_ALT_ID and .id = the two byte jedec device id.
A 4KB subsector erase capability is added and used for this new device. It requires using a different SPI op-code supported by adding .op_erase member. Previous devices defined in stmicro.c are assigned their original op-code for 64KB sector erase.
N25Q128 is now working on a custom designed Bayley Bay based board. Tested by verifying the MRC fastboot cache is successfully (re)written. Note that previous devices were not retested.
Change-Id: Ic63d86958bf8d301898a157b435f549a0dd9893c Signed-off-by: Scott Radcliffe sradcliffe@microind.com --- src/drivers/spi/stmicro.c | 37 +++++++++++++++++++++++++++++++++++-- 1 file changed, 35 insertions(+), 2 deletions(-)
diff --git a/src/drivers/spi/stmicro.c b/src/drivers/spi/stmicro.c index 40bce31..fda6124 100644 --- a/src/drivers/spi/stmicro.c +++ b/src/drivers/spi/stmicro.c @@ -40,6 +40,7 @@ #define CMD_M25PXX_READ 0x03 /* Read Data Bytes */ #define CMD_M25PXX_FAST_READ 0x0b /* Read Data Bytes at Higher Speed */ #define CMD_M25PXX_PP 0x02 /* Page Program */ +#define CMD_M25PXX_SSE 0x20 /* Subsector Erase */ #define CMD_M25PXX_SE 0xd8 /* Sector Erase */ #define CMD_M25PXX_BE 0xc7 /* Bulk Erase */ #define CMD_M25PXX_DP 0xb9 /* Deep Power-down */ @@ -53,9 +54,17 @@ #define STM_ID_M25P64 0x17 #define STM_ID_M25P80 0x14 #define STM_ID_M25P128 0x18 +#define STM_ID_USE_ALT_ID 0xFF
+/* Some SPI flash share the same .idcode1 (idcode[2]). To handle this without + * (possibly) breaking existing implementations, add the new device at the top + * of the flash table array and set its .idcode1 = STM_ID_USE_ALT_ID. The .id + * is then (idcode[1] << 8 | idcode[2]). + */ struct stmicro_spi_flash_params { u8 idcode1; + u8 op_erase; + u16 id; u16 page_size; u16 pages_per_sector; u16 nr_sectors; @@ -76,7 +85,17 @@ 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_USE_ALT_ID, + .id = 0xbb18, + .op_erase = CMD_M25PXX_SSE, + .page_size = 256, + .pages_per_sector = 16, + .nr_sectors = 4096, + .name = "N25Q128", + }, + { .idcode1 = STM_ID_M25P10, + .op_erase = CMD_M25PXX_SE, .page_size = 256, .pages_per_sector = 128, .nr_sectors = 4, @@ -84,6 +103,7 @@ static const struct stmicro_spi_flash_params stmicro_spi_flash_table[] = { }, { .idcode1 = STM_ID_M25P16, + .op_erase = CMD_M25PXX_SE, .page_size = 256, .pages_per_sector = 256, .nr_sectors = 32, @@ -91,6 +111,7 @@ static const struct stmicro_spi_flash_params stmicro_spi_flash_table[] = { }, { .idcode1 = STM_ID_M25P20, + .op_erase = CMD_M25PXX_SE, .page_size = 256, .pages_per_sector = 256, .nr_sectors = 4, @@ -98,6 +119,7 @@ static const struct stmicro_spi_flash_params stmicro_spi_flash_table[] = { }, { .idcode1 = STM_ID_M25P32, + .op_erase = CMD_M25PXX_SE, .page_size = 256, .pages_per_sector = 256, .nr_sectors = 64, @@ -105,6 +127,7 @@ static const struct stmicro_spi_flash_params stmicro_spi_flash_table[] = { }, { .idcode1 = STM_ID_M25P40, + .op_erase = CMD_M25PXX_SE, .page_size = 256, .pages_per_sector = 256, .nr_sectors = 8, @@ -112,6 +135,7 @@ static const struct stmicro_spi_flash_params stmicro_spi_flash_table[] = { }, { .idcode1 = STM_ID_M25P64, + .op_erase = CMD_M25PXX_SE, .page_size = 256, .pages_per_sector = 256, .nr_sectors = 128, @@ -119,6 +143,7 @@ static const struct stmicro_spi_flash_params stmicro_spi_flash_table[] = { }, { .idcode1 = STM_ID_M25P80, + .op_erase = CMD_M25PXX_SE, .page_size = 256, .pages_per_sector = 256, .nr_sectors = 16, @@ -126,6 +151,7 @@ static const struct stmicro_spi_flash_params stmicro_spi_flash_table[] = { }, { .idcode1 = STM_ID_M25P128, + .op_erase = CMD_M25PXX_SE, .page_size = 256, .pages_per_sector = 1024, .nr_sectors = 64, @@ -202,7 +228,9 @@ out:
static int stmicro_erase(struct spi_flash *flash, u32 offset, size_t len) { - return spi_flash_cmd_erase(flash, CMD_M25PXX_SE, offset, len); + struct stmicro_spi_flash *stm = to_stmicro_spi_flash(flash); + + return spi_flash_cmd_erase(flash, stm->params->op_erase, offset, len); }
struct spi_flash *spi_flash_probe_stmicro(struct spi_slave *spi, u8 * idcode) @@ -226,7 +254,12 @@ struct spi_flash *spi_flash_probe_stmicro(struct spi_slave *spi, u8 * idcode)
for (i = 0; i < ARRAY_SIZE(stmicro_spi_flash_table); i++) { params = &stmicro_spi_flash_table[i]; - if (params->idcode1 == idcode[2]) { + if (params->idcode1 == STM_ID_USE_ALT_ID) { + if (params->id == ((idcode[1] << 8) | idcode[2])) { + break; + } + } + else if (params->idcode1 == idcode[2]) { break; } }