U-Boot SPI NOR support (sf layer) is quite outdated as it does not support 4 byte addressing opcodes, SFDP table parsing and different types of quad mode enable sequences. Many newer flashes no longer support BANK registers used by sf layer to a access >16MB space. Also, many SPI controllers have special MMIO interfaces which provide accelerated read/write access but require knowledge of flash parameters to make use of it. Recent spi-mem layer provides a way to support such flashes but sf layer isn't using that. This patch series syncs SPI NOR framework from Linux v4.19. It also adds spi-mem support on top. So, we gain 4byte addressing support and SFDP support. This makes migrating to U-Boot MTD framework easier.
Tested with few Spansion, micron and macronix flashes with TI's dra7xx, k2g, am43xx EVMs. I dont have access to flashes from other vendors. So, I would greatly appreciate testing on other platforms. Complete series with dependencies here[1]
For clean build on some platforms, depends on CONFIG_SPI_FLASH migration to defconfigs [2]
[1] https://github.com/r-vignesh/u-boot.git branch: spi-nor-mig-v2 [2] https://patchwork.ozlabs.org/patch/1007485/
Change log: v2: Add lightweight SPI flash stack for boards with SPL size constraints Provide non DM version of spi-mem Fix build issues on different platforms as reported by travis-ci on v1
v1: https://patchwork.ozlabs.org/cover/1004689/
Vignesh R (11): spi: spi-mem: Allow use of spi_mem_exec_op for all SPI modes spi-mem: Claim SPI bus before spi mem access spi: Add non DM version of SPI_MEM sh: bitops: add hweight*() macros mtd: spi: Port SPI NOR framework from Linux mtd spi: Switch to new SPI NOR framework mtd: spi: Remove unused files mtd: spi: Add lightweight SPI flash stack for SPL sf_mtd: Simply mtd operations taurus_defconfig: Enable simple malloc in SPL axm_defconfig: Enable simple malloc in SPL
arch/sh/include/asm/bitops.h | 4 + common/spl/Kconfig | 16 + configs/axm_defconfig | 1 + configs/taurus_defconfig | 1 + drivers/mtd/spi/Kconfig | 8 + drivers/mtd/spi/Makefile | 10 +- drivers/mtd/spi/sandbox.c | 36 +- drivers/mtd/spi/sf_dataflash.c | 11 +- drivers/mtd/spi/sf_internal.h | 230 +--- drivers/mtd/spi/sf_mtd.c | 39 +- drivers/mtd/spi/sf_probe.c | 35 +- drivers/mtd/spi/spi-nor-ids.c | 294 ++++ drivers/mtd/spi/spi-nor-tiny.c | 806 +++++++++++ drivers/mtd/spi/spi-nor.c | 2300 +++++++++++++++++++++++++++++++ drivers/mtd/spi/spi_flash.c | 1337 ------------------ drivers/mtd/spi/spi_flash_ids.c | 211 --- drivers/spi/Kconfig | 4 +- drivers/spi/Makefile | 1 + drivers/spi/spi-mem-nodm.c | 89 ++ drivers/spi/spi-mem.c | 15 +- drivers/spi/stm32_qspi.c | 4 +- include/linux/mtd/cfi.h | 32 + include/linux/mtd/spi-nor.h | 421 ++++++ include/spi_flash.h | 105 +- 24 files changed, 4116 insertions(+), 1894 deletions(-) create mode 100644 drivers/mtd/spi/spi-nor-ids.c create mode 100644 drivers/mtd/spi/spi-nor-tiny.c create mode 100644 drivers/mtd/spi/spi-nor.c delete mode 100644 drivers/mtd/spi/spi_flash.c delete mode 100644 drivers/mtd/spi/spi_flash_ids.c create mode 100644 drivers/spi/spi-mem-nodm.c create mode 100644 include/linux/mtd/cfi.h create mode 100644 include/linux/mtd/spi-nor.h