diff options
Diffstat (limited to 'src/soc/intel/common')
| -rw-r--r-- | src/soc/intel/common/block/fast_spi/fast_spi_def.h | 6 | ||||
| -rw-r--r-- | src/soc/intel/common/block/fast_spi/fast_spi_flash.c | 37 |
2 files changed, 31 insertions, 12 deletions
diff --git a/src/soc/intel/common/block/fast_spi/fast_spi_def.h b/src/soc/intel/common/block/fast_spi/fast_spi_def.h index cc1cdaa70c..72c359e6ee 100644 --- a/src/soc/intel/common/block/fast_spi/fast_spi_def.h +++ b/src/soc/intel/common/block/fast_spi/fast_spi_def.h @@ -3,6 +3,11 @@ #ifndef SOC_INTEL_COMMON_BLOCK_FAST_SPI_DEF_H #define SOC_INTEL_COMMON_BLOCK_FAST_SPI_DEF_H +/* From JEDEC SFDP JESD216F.02 */ +#define SFDP_HDR_SIG 0x00 /* 1st DWORD of SFDP header */ +#define SFDP_PARAM_DENSITY 0x04 /* 2nd DWORD of SFDP params */ +#define SFDP_SIGNATURE 0x50444653 /* Valid sig in 1st DWORD of SFDP header */ + /* PCI configuration registers */ #define SPI_BIOS_DECODE_EN 0xd8 #define SPI_BIOS_DECODE_LOCK BIT(31) @@ -153,7 +158,6 @@ #define SPIBAR_PTINX_HORD_SFDP (0 << 12) #define SPIBAR_PTINX_HORD_PARAM (1 << 12) #define SPIBAR_PTINX_HORD_JEDEC (2 << 12) -#define SPIBAR_PTINX_IDX_MASK 0xffc /* Register Offsets of BIOS Flash Program Registers */ #define SPIBAR_RESET_LOCK 0xf0 diff --git a/src/soc/intel/common/block/fast_spi/fast_spi_flash.c b/src/soc/intel/common/block/fast_spi/fast_spi_flash.c index f896cd9a3a..e9cfc230a4 100644 --- a/src/soc/intel/common/block/fast_spi/fast_spi_flash.c +++ b/src/soc/intel/common/block/fast_spi/fast_spi_flash.c @@ -54,22 +54,22 @@ static void fast_spi_flash_ctrlr_reg_write(struct fast_spi_flash_ctx *ctx, } /* - * The hardware datasheet is not clear on what HORD values actually do. It - * seems that HORD_SFDP provides access to the first 8 bytes of the SFDP, which - * is the signature and revision fields. HORD_JEDEC provides access to the - * actual flash parameters, and is most likely what you want to use when - * probing the flash from software. + * Via component field (bits 15-14) we can select either 1st or 2nd flash + * (in dual flash setups). + * Via HORD - Header or Data (bits 13-12) - we can select either: + * - SFDP Header + * - Param Table Header + * - Data (JEDEC params, including density) + * * It's okay to rely on SFDP, since the SPI flash controller requires an SFDP * 1.5 or newer compliant FAST_SPI flash chip. * NOTE: Due to the register layout of the hardware, all accesses will be * aligned to a 4 byte boundary. */ -static uint32_t fast_spi_flash_read_sfdp_param(struct fast_spi_flash_ctx *ctx, - uint16_t sfdp_reg) +static uint32_t fast_spi_flash_read_sfdp(struct fast_spi_flash_ctx *ctx, + uint32_t ptinx_reg) { - uint32_t ptinx_index = sfdp_reg & SPIBAR_PTINX_IDX_MASK; - fast_spi_flash_ctrlr_reg_write(ctx, SPIBAR_PTINX, - ptinx_index | SPIBAR_PTINX_HORD_JEDEC); + fast_spi_flash_ctrlr_reg_write(ctx, SPIBAR_PTINX, ptinx_reg); return fast_spi_flash_ctrlr_reg_read(ctx, SPIBAR_PTDATA); } @@ -312,15 +312,30 @@ static int fast_spi_flash_probe(const struct spi_slave *dev, { BOILERPLATE_CREATE_CTX(ctx); uint32_t flash_bits; + uint32_t ptinx_reg; /* * bytes = (bits + 1) / 8; * But we need to do the addition in a way which doesn't overflow for * 4 Gbit devices (flash_bits == 0xffffffff). */ - flash_bits = fast_spi_flash_read_sfdp_param(ctx, 0x04); + ptinx_reg = SPIBAR_PTINX_COMP_0 | SPIBAR_PTINX_HORD_JEDEC | SFDP_PARAM_DENSITY; + flash_bits = fast_spi_flash_read_sfdp(ctx, ptinx_reg); flash->size = (flash_bits >> 3) + 1; + /* + * Now check if we have a second flash component. + * Check SFDP header for the SFDP signature. If valid, then 2nd component is present. + * Increase the flash size if 2nd component is found, analogically like the 1st + * component. + */ + ptinx_reg = SPIBAR_PTINX_COMP_1 | SPIBAR_PTINX_HORD_SFDP | SFDP_HDR_SIG; + if (fast_spi_flash_read_sfdp(ctx, ptinx_reg) == SFDP_SIGNATURE) { + ptinx_reg = SPIBAR_PTINX_COMP_1 | SPIBAR_PTINX_HORD_JEDEC | SFDP_PARAM_DENSITY; + flash_bits = fast_spi_flash_read_sfdp(ctx, ptinx_reg); + flash->size += ((flash_bits >> 3) + 1); + } + memcpy(&flash->spi, dev, sizeof(*dev)); /* Can erase both 4 KiB and 64 KiB chunks. Declare the smaller size. */ |