From 99e45ceb35ff9a4c48e516e6d005ebfae54b6591 Mon Sep 17 00:00:00 2001 From: Julius Werner Date: Thu, 6 Jun 2019 17:03:44 -0700 Subject: spi_flash: Add Dual SPI support This patch adds support to read SPI flash in Dual SPI mode, where both MISO and MOSI lines are used for output mode (specifically Fast Read Dual Output (0x3b) where the command is still sent normally, not Fast Read Dual I/O (0xbb) whose additional benefit should be extremely marginal for our use cases but which would be more complicated to implement). This feature needs to be supported by both the flash chip and the controller, so we add a new dual_spi flag (and a new flags field to hold it) to the spi_flash structure and a new optional xfer_dual() function pointer to the spi_ctrlr structure. When both are provided, Dual SPI mode is used automatically, otherwise things work as before. This patch only adds the dual_spi flag exemplary to all Winbond and Gigadevice chips, other vendors need to be added as needed. Change-Id: Ic6808224c99af32b6c5c43054135c8f4c03c1feb Signed-off-by: Julius Werner Reviewed-on: https://review.coreboot.org/c/coreboot/+/33283 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin Reviewed-by: Furquan Shaikh --- src/drivers/spi/gigadevice.c | 16 +++++++++++++- src/drivers/spi/spi_flash.c | 41 ++++++++++++++++++++++++++++++++++-- src/drivers/spi/spi_flash_internal.h | 2 ++ src/drivers/spi/winbond.c | 22 ++++++++++++++++++- 4 files changed, 77 insertions(+), 4 deletions(-) (limited to 'src/drivers') diff --git a/src/drivers/spi/gigadevice.c b/src/drivers/spi/gigadevice.c index cc4cf1dddb..1ff594a24a 100644 --- a/src/drivers/spi/gigadevice.c +++ b/src/drivers/spi/gigadevice.c @@ -41,7 +41,9 @@ struct gigadevice_spi_flash_params { uint16_t id; - uint8_t l2_page_size_shift; + uint8_t dual_spi : 1; + uint8_t _reserved_for_flags : 3; + uint8_t l2_page_size_shift : 4; uint8_t pages_per_sector_shift : 4; uint8_t sectors_per_block_shift : 4; uint8_t nr_blocks_shift; @@ -63,6 +65,7 @@ static const struct gigadevice_spi_flash_params gigadevice_spi_flash_table[] = { .pages_per_sector_shift = 4, .sectors_per_block_shift = 4, .nr_blocks_shift = 4, + .dual_spi = 1, .name = "GD25Q80", }, /* also GD25Q80B */ { @@ -71,6 +74,7 @@ static const struct gigadevice_spi_flash_params gigadevice_spi_flash_table[] = { .pages_per_sector_shift = 4, .sectors_per_block_shift = 4, .nr_blocks_shift = 5, + .dual_spi = 1, .name = "GD25Q16", }, /* also GD25Q16B */ { @@ -79,6 +83,7 @@ static const struct gigadevice_spi_flash_params gigadevice_spi_flash_table[] = { .pages_per_sector_shift = 4, .sectors_per_block_shift = 4, .nr_blocks_shift = 6, + .dual_spi = 1, .name = "GD25Q32B", }, /* also GD25Q32B */ { @@ -87,6 +92,7 @@ static const struct gigadevice_spi_flash_params gigadevice_spi_flash_table[] = { .pages_per_sector_shift = 4, .sectors_per_block_shift = 4, .nr_blocks_shift = 7, + .dual_spi = 1, .name = "GD25Q64", }, /* also GD25Q64B, GD25B64C */ { @@ -95,6 +101,7 @@ static const struct gigadevice_spi_flash_params gigadevice_spi_flash_table[] = { .pages_per_sector_shift = 4, .sectors_per_block_shift = 4, .nr_blocks_shift = 8, + .dual_spi = 1, .name = "GD25Q128", }, /* also GD25Q128B */ { @@ -103,6 +110,7 @@ static const struct gigadevice_spi_flash_params gigadevice_spi_flash_table[] = { .pages_per_sector_shift = 4, .sectors_per_block_shift = 4, .nr_blocks_shift = 4, + .dual_spi = 1, .name = "GD25VQ80C", }, { @@ -111,6 +119,7 @@ static const struct gigadevice_spi_flash_params gigadevice_spi_flash_table[] = { .pages_per_sector_shift = 4, .sectors_per_block_shift = 4, .nr_blocks_shift = 5, + .dual_spi = 1, .name = "GD25VQ16C", }, { @@ -119,6 +128,7 @@ static const struct gigadevice_spi_flash_params gigadevice_spi_flash_table[] = { .pages_per_sector_shift = 4, .sectors_per_block_shift = 4, .nr_blocks_shift = 4, + .dual_spi = 1, .name = "GD25LQ80", }, { @@ -127,6 +137,7 @@ static const struct gigadevice_spi_flash_params gigadevice_spi_flash_table[] = { .pages_per_sector_shift = 4, .sectors_per_block_shift = 4, .nr_blocks_shift = 5, + .dual_spi = 1, .name = "GD25LQ16", }, { @@ -135,6 +146,7 @@ static const struct gigadevice_spi_flash_params gigadevice_spi_flash_table[] = { .pages_per_sector_shift = 4, .sectors_per_block_shift = 4, .nr_blocks_shift = 6, + .dual_spi = 1, .name = "GD25LQ32", }, { @@ -143,6 +155,7 @@ static const struct gigadevice_spi_flash_params gigadevice_spi_flash_table[] = { .pages_per_sector_shift = 4, .sectors_per_block_shift = 4, .nr_blocks_shift = 7, + .dual_spi = 1, .name = "GD25LQ64C", }, /* also GD25LB64C */ { @@ -151,6 +164,7 @@ static const struct gigadevice_spi_flash_params gigadevice_spi_flash_table[] = { .pages_per_sector_shift = 4, .sectors_per_block_shift = 4, .nr_blocks_shift = 8, + .dual_spi = 1, .name = "GD25LQ128", }, }; diff --git a/src/drivers/spi/spi_flash.c b/src/drivers/spi/spi_flash.c index 5e42a375f6..a81306e386 100644 --- a/src/drivers/spi/spi_flash.c +++ b/src/drivers/spi/spi_flash.c @@ -59,6 +59,34 @@ static int do_spi_flash_cmd(const struct spi_slave *spi, const void *dout, return ret; } +static int do_dual_read_cmd(const struct spi_slave *spi, const void *dout, + size_t bytes_out, void *din, size_t bytes_in) +{ + int ret; + + /* + * spi_xfer_vector() will automatically fall back to .xfer() if + * .xfer_vector() is unimplemented. So using vector API here is more + * flexible, even though a controller that implements .xfer_vector() + * and (the non-vector based) .xfer_dual() but not .xfer() would be + * pretty odd. + */ + struct spi_op vector = { .dout = dout, .bytesout = bytes_out, + .din = NULL, .bytesin = 0 }; + + ret = spi_claim_bus(spi); + if (ret) + return ret; + + ret = spi_xfer_vector(spi, &vector, 1); + + if (!ret) + ret = spi->ctrlr->xfer_dual(spi, NULL, 0, din, bytes_in); + + spi_release_bus(spi); + return ret; +} + int spi_flash_cmd(const struct spi_slave *spi, u8 cmd, void *response, size_t len) { int ret = do_spi_flash_cmd(spi, &cmd, sizeof(cmd), response, len); @@ -105,6 +133,11 @@ static int spi_flash_read_chunked(const struct spi_flash *flash, u32 offset, cmd_len = 4; cmd[0] = CMD_READ_ARRAY_SLOW; do_cmd = do_spi_flash_cmd; + } else if (flash->flags.dual_spi && flash->spi.ctrlr->xfer_dual) { + cmd_len = 5; + cmd[0] = CMD_READ_FAST_DUAL_OUTPUT; + cmd[4] = 0; + do_cmd = do_dual_read_cmd; } else { cmd_len = 5; cmd[0] = CMD_READ_ARRAY_FAST; @@ -347,8 +380,12 @@ int spi_flash_probe(unsigned int bus, unsigned int cs, struct spi_flash *flash) return -1; } - printk(BIOS_INFO, "SF: Detected %s with sector size 0x%x, total 0x%x\n", - flash->name, flash->sector_size, flash->size); + const char *mode_string = ""; + if (flash->flags.dual_spi && spi.ctrlr->xfer_dual) + mode_string = " (Dual SPI mode)"; + printk(BIOS_INFO, + "SF: Detected %s with sector size 0x%x, total 0x%x%s\n", + flash->name, flash->sector_size, flash->size, mode_string); if (bus == CONFIG_BOOT_DEVICE_SPI_FLASH_BUS && flash->size != CONFIG_ROM_SIZE) { printk(BIOS_ERR, "SF size 0x%x does not correspond to" diff --git a/src/drivers/spi/spi_flash_internal.h b/src/drivers/spi/spi_flash_internal.h index f15c737461..4a9e289029 100644 --- a/src/drivers/spi/spi_flash_internal.h +++ b/src/drivers/spi/spi_flash_internal.h @@ -23,6 +23,8 @@ #define CMD_READ_ARRAY_FAST 0x0b #define CMD_READ_ARRAY_LEGACY 0xe8 +#define CMD_READ_FAST_DUAL_OUTPUT 0x3b + #define CMD_READ_STATUS 0x05 #define CMD_WRITE_ENABLE 0x06 diff --git a/src/drivers/spi/winbond.c b/src/drivers/spi/winbond.c index d0ef3cd6e0..9e9bb00464 100644 --- a/src/drivers/spi/winbond.c +++ b/src/drivers/spi/winbond.c @@ -26,7 +26,9 @@ struct winbond_spi_flash_params { uint16_t id; - uint8_t l2_page_size_shift; + uint8_t dual_spi : 1; + uint8_t _reserved_for_flags : 3; + uint8_t l2_page_size_shift : 4; uint8_t pages_per_sector_shift : 4; uint8_t sectors_per_block_shift : 4; uint8_t nr_blocks_shift; @@ -123,6 +125,7 @@ static const struct winbond_spi_flash_params winbond_spi_flash_table[] = { .sectors_per_block_shift = 4, .nr_blocks_shift = 4, .name = "W25X80", + .dual_spi = 1, }, { .id = 0x3015, @@ -131,6 +134,7 @@ static const struct winbond_spi_flash_params winbond_spi_flash_table[] = { .sectors_per_block_shift = 4, .nr_blocks_shift = 5, .name = "W25X16", + .dual_spi = 1, }, { .id = 0x3016, @@ -139,6 +143,7 @@ static const struct winbond_spi_flash_params winbond_spi_flash_table[] = { .sectors_per_block_shift = 4, .nr_blocks_shift = 6, .name = "W25X32", + .dual_spi = 1, }, { .id = 0x3017, @@ -147,6 +152,7 @@ static const struct winbond_spi_flash_params winbond_spi_flash_table[] = { .sectors_per_block_shift = 4, .nr_blocks_shift = 7, .name = "W25X64", + .dual_spi = 1, }, { .id = 0x4014, @@ -155,6 +161,7 @@ static const struct winbond_spi_flash_params winbond_spi_flash_table[] = { .sectors_per_block_shift = 4, .nr_blocks_shift = 4, .name = "W25Q80_V", + .dual_spi = 1, }, { .id = 0x4015, @@ -163,6 +170,7 @@ static const struct winbond_spi_flash_params winbond_spi_flash_table[] = { .sectors_per_block_shift = 4, .nr_blocks_shift = 5, .name = "W25Q16_V", + .dual_spi = 1, .protection_granularity_shift = 16, .bp_bits = 3, }, @@ -173,6 +181,7 @@ static const struct winbond_spi_flash_params winbond_spi_flash_table[] = { .sectors_per_block_shift = 4, .nr_blocks_shift = 5, .name = "W25Q16DW", + .dual_spi = 1, .protection_granularity_shift = 16, .bp_bits = 3, }, @@ -183,6 +192,7 @@ static const struct winbond_spi_flash_params winbond_spi_flash_table[] = { .sectors_per_block_shift = 4, .nr_blocks_shift = 6, .name = "W25Q32_V", + .dual_spi = 1, .protection_granularity_shift = 16, .bp_bits = 3, }, @@ -193,6 +203,7 @@ static const struct winbond_spi_flash_params winbond_spi_flash_table[] = { .sectors_per_block_shift = 4, .nr_blocks_shift = 6, .name = "W25Q32DW", + .dual_spi = 1, .protection_granularity_shift = 16, .bp_bits = 3, }, @@ -203,6 +214,7 @@ static const struct winbond_spi_flash_params winbond_spi_flash_table[] = { .sectors_per_block_shift = 4, .nr_blocks_shift = 7, .name = "W25Q64_V", + .dual_spi = 1, .protection_granularity_shift = 17, .bp_bits = 3, }, @@ -213,6 +225,7 @@ static const struct winbond_spi_flash_params winbond_spi_flash_table[] = { .sectors_per_block_shift = 4, .nr_blocks_shift = 7, .name = "W25Q64DW", + .dual_spi = 1, .protection_granularity_shift = 17, .bp_bits = 3, }, @@ -223,6 +236,7 @@ static const struct winbond_spi_flash_params winbond_spi_flash_table[] = { .sectors_per_block_shift = 4, .nr_blocks_shift = 8, .name = "W25Q128_V", + .dual_spi = 1, .protection_granularity_shift = 18, .bp_bits = 3, }, @@ -233,6 +247,7 @@ static const struct winbond_spi_flash_params winbond_spi_flash_table[] = { .sectors_per_block_shift = 4, .nr_blocks_shift = 8, .name = "W25Q128FW", + .dual_spi = 1, .protection_granularity_shift = 18, .bp_bits = 3, }, @@ -243,6 +258,7 @@ static const struct winbond_spi_flash_params winbond_spi_flash_table[] = { .sectors_per_block_shift = 4, .nr_blocks_shift = 8, .name = "W25Q128J", + .dual_spi = 1, .protection_granularity_shift = 18, .bp_bits = 3, }, @@ -253,6 +269,7 @@ static const struct winbond_spi_flash_params winbond_spi_flash_table[] = { .sectors_per_block_shift = 4, .nr_blocks_shift = 9, .name = "W25Q256_V", + .dual_spi = 1, .protection_granularity_shift = 16, .bp_bits = 4, }, @@ -263,6 +280,7 @@ static const struct winbond_spi_flash_params winbond_spi_flash_table[] = { .sectors_per_block_shift = 4, .nr_blocks_shift = 9, .name = "W25Q256J", + .dual_spi = 1, .protection_granularity_shift = 16, .bp_bits = 4, }, @@ -681,6 +699,8 @@ int spi_flash_probe_winbond(const struct spi_slave *spi, u8 *idcode, flash->erase_cmd = CMD_W25_SE; flash->status_cmd = CMD_W25_RDSR; + flash->flags.dual_spi = params->dual_spi; + flash->ops = &spi_flash_ops; flash->driver_private = params; -- cgit v1.2.3