[U-Boot] [PATCH v3 00/20] SF: Migrate to Linux SPI NOR framework

[Simon Goldschmidt]

On Thu, Jan 31, 2019 at 3:43 PM Tom Rini <trini at konsulko.com> wrote:
>
> On Thu, Jan 31, 2019 at 08:10:53PM +0530, Jagan Teki wrote:
> > On Tue, Jan 29, 2019 at 11:19 AM Vignesh R <vigneshr at ti.com> wrote:
> > >
> > > Here is the v3 of SPI NOR migration(github branch at [1]). I have
> > > retained Tested-by from v2 as this is just re split of patches and
> > > minor fixups.
> > >
> > > Travis ci reports all green.
> > >
> > > Change log:
> > > Since v2:
> > > Split sync up patches into smaller versions so that its easier for review.
> > > Address comments by Jagan and Simon Goldschmidt on v2.
> > > Make SPI_FLASH_TINY(read only SF stack)  as default for SPL build to
> > > offset against size increase due to new code.
> > >
> > > Since v1:
> > > Remove #ifindef __UBOOT__
> > > Add back BAR support, but dont enable as default for all platform (see
> > > 10/11 for more details)
> > > Enable SPI_FLASH_TINY on boards where there is SPL size constraint as
> > > seen on travis ci builds.
> > > Drop sf_mtd changes for now as it seems to cause issues.
> > > v1: https://patchwork.ozlabs.org/cover/1012146/
> > >
> > > Since RFC v2:
> > > Fix issues reported by Simon Goldschmidt wrt 4 use of byte addressing opcode
> > > Fix issues in compiling SFDP code
> > > Re organize file names and Makefile to simply spi-nor-tiny inclusion
> > > Remove SPI_FLASH_BAR and SF_DUAL_FLASH as these are no longer used
> > > RFC v2: https://patchwork.ozlabs.org/cover/1007589/
> > >
> > > Since RFC v1:
> > > 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
> > >
> > > RFC v1: https://patchwork.ozlabs.org/cover/1004689/
> > >
> > > Background:
> > >
> > > U-Boot SPI NOR support (sf layer) is quite outdated as it does not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-patch-v3
> > > [2] https://patchwork.ozlabs.org/patch/1007485/
> > >
> > > Vignesh R (20):
> > >   configs: Move CONFIG_SPI_FLASH into defconfigs
> > >   bitops: Fix GENMASK definition for Sandbox
> > >   spi: spi-mem: Allow use of spi_mem_exec_op for all SPI modes
> > >   spi: spi-mem: Extend spi_mem_adjust_op_size() to honor max xfer size
> > >   spi: 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: spi-nor-core: Add SPI MEM support
> > >   mtd: spi: spi-nor-core: Add 4 Byte addressing support
> > >   mtd: spi: spi-nor-core: Add SFDP support
> > >   mtd: spi: spi-nor-core: Add back U-Boot specific features
> > >   mtd: spi: sf_probe: Add "jedec,spi-nor" compatible string
> > >   mtd: spi: Switch to new SPI NOR framework
> > >   mtd: spi: Remove unused files
> > >   mtd: spi: Add lightweight SPI flash stack for SPL
> > >   spl: Kconfig: Enable SPI_FLASH_TINY by default for SPL
> > >   configs: Remove SF_DUAL_FLASH
> > >   configs: Don't use SPI_FLASH_BAR as default
> > >   MAINTAINERS: Add an entry for SPI NOR
> >
> > Except 16/20 and 19/20, all look fine to me.
> >
> > Reviewed-by: Jagan Teki <jagan at openedev.com>
> > Tested-by: Jagan Teki <jagan at amarulasolutions.com> #zynq-microzed
>
> And based on the Xilinx folks reply to 19/20, is 16/20 something we can
> deal with as a follow-up?  Thanks!

Going without 16/20 will increase the footprint in SPL. Given the limitation
of size checks discussed recently, I don't think that would be a good idea.

Regards,
Simon