diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mtd/spi-nor/sfdp.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/mtd/spi-nor/sfdp.c b/drivers/mtd/spi-nor/sfdp.c index b2d097b44a55..3efcba5e629a 100644 --- a/drivers/mtd/spi-nor/sfdp.c +++ b/drivers/mtd/spi-nor/sfdp.c @@ -21,6 +21,10 @@ #define SFDP_SECTOR_MAP_ID 0xff81 /* Sector Map Table */ #define SFDP_4BAIT_ID 0xff84 /* 4-byte Address Instruction Table */ #define SFDP_PROFILE1_ID 0xff05 /* xSPI Profile 1.0 table. */ +#define SFDP_SCCR_MAP_ID 0xff87 /* + * Status, Control and Configuration + * Register Map. + */ #define SFDP_SIGNATURE 0x50444653U @@ -1195,6 +1199,46 @@ out: return ret; } +#define SCCR_DWORD22_OCTAL_DTR_EN_VOLATILE BIT(31) + +/** + * spi_nor_parse_sccr() - Parse the Status, Control and Configuration Register + * Map. + * @nor: pointer to a 'struct spi_nor' + * @sccr_header: pointer to the 'struct sfdp_parameter_header' describing + * the SCCR Map table length and version. + * @params: pointer to the 'struct spi_nor_flash_parameter' to be. + * + * Return: 0 on success, -errno otherwise. + */ +static int spi_nor_parse_sccr(struct spi_nor *nor, + const struct sfdp_parameter_header *sccr_header, + struct spi_nor_flash_parameter *params) +{ + u32 *dwords, addr; + size_t len; + int ret; + + len = sccr_header->length * sizeof(*dwords); + dwords = kmalloc(len, GFP_KERNEL); + if (!dwords) + return -ENOMEM; + + addr = SFDP_PARAM_HEADER_PTP(sccr_header); + ret = spi_nor_read_sfdp(nor, addr, len, dwords); + if (ret) + goto out; + + le32_to_cpu_array(dwords, sccr_header->length); + + if (FIELD_GET(SCCR_DWORD22_OCTAL_DTR_EN_VOLATILE, dwords[22])) + nor->flags |= SNOR_F_IO_MODE_EN_VOLATILE; + +out: + kfree(dwords); + return ret; +} + /** * spi_nor_parse_sfdp() - parse the Serial Flash Discoverable Parameters. * @nor: pointer to a 'struct spi_nor' @@ -1300,6 +1344,10 @@ int spi_nor_parse_sfdp(struct spi_nor *nor, err = spi_nor_parse_profile1(nor, param_header, params); break; + case SFDP_SCCR_MAP_ID: + err = spi_nor_parse_sccr(nor, param_header, params); + break; + default: break; } |