[PATCH v5 00/13] Supporting restricted NAND controllers

[Miquel Raynal <miquel.raynal@xxxxxxxxxxx>]

Hello,

The first 6 patches are just miscellaneous changes, that do not bring
functional changes but clarify a few core areas.

Patches 7 to 10 change the NAND operations used to read ONFI/JEDEC
parameter pages. I expect all controllers to support it now.

Patch 11 add new nand_monolithic_read/write_page_raw() helpers, that
could be used by drivers which are "constrained".

Finally, patches 12 and 13 soften the rules so that the hooks linked
to the above helpers are not overwritten by the core or NAND chip
drivers.

This series is needed in order to support controllers like Arasan's.

Thanks,
Miquèl


Changes in v5:
* Dropped the "Default" in
  "Default nand_read/write_page_raw implementations" comment in a
  header.
* Changed the name of nand_check_supported_op() into nand_check_op().

Changes in v4:
* Collected Reviewed-by tags.
* Changed the xxx() == 0 conditions into !xxx()
* Removed the use of pbuf in the JEDEC driver, keep using p only
* Dropped the extra sentence in the kernel doc of monolithic helpers

Changes in v3:
* s/NAND_USE_DMA_BUFFER/NAND_USES_DMA/ as suggested by Boris.
* Collected Reviewed-by tags.
* Enhance the kernel doc of the monolithic helpers.
* Added a nand_check_supported_op() helper.
* Add a check_only argument to the nand_read_data_op() helper so that
  we can check if it is supported by the controller driver (this uses
  the nand_check_supported_op() helper).
* Enhance the ONFI/JEDEC parameter page discoveries: in case the
  driver does not support ->exec_op(), we still use the same behavior
  as before (reading data bytes only), otherwise we check if reading
  data bytes is supported or not. If it is not, then we fallback to a
  CHANGE READ COLUMN operation.

Changes in v2:
* Fixed the two wrong conversions of flag values from 8-bit digits
  into BIT() macros.
* Dropped "Help supporting controllers that are not able to split
  operations". Instead, decided on the fly for the read_param_page()
  uses (ONFI and JEDEC discovery) and wrote separate helpers for
  read/write_page_raw() (the Arasan driver will use them).
* Prevent the core and NAND chip drivers to overload the
  ecc->read/write_page_raw() hooks.
* Added Reviewed-by tags.

Miquel Raynal (13):
  mtd: rawnand: Translate obscure bitfields into readable macros
  mtd: rawnand: Reorder the nand_chip->options flags
  mtd: rawnand: Rename a NAND chip option
  mtd: rawnand: Fix comments about the use of bufpoi
  mtd: rawnand: Rename the use_bufpoi variables
  mtd: rawnand: Avoid indirect access to ->data_buf()
  mtd: rawnand: Add a helper to check supported operations
  mtd: rawnand: Give the possibility to verify a read operation is
    supported
  mtd: rawnand: onfi: Adapt the parameter page read to constraint
    controllers
  mtd: rawnand: jedec: Adapt the parameter page read to constraint
    controllers
  mtd: rawnand: Expose monolithic read/write_page_raw() helpers
  mtd: rawnand: Allow controllers to overload soft ECC hooks
  mtd: rawnand: micron: Allow controllers to overload raw accessors

 drivers/mtd/nand/raw/atmel/nand-controller.c |   2 +-
 drivers/mtd/nand/raw/brcmnand/brcmnand.c     |   2 +-
 drivers/mtd/nand/raw/denali.c                |   2 +-
 drivers/mtd/nand/raw/fsmc_nand.c             |   2 +-
 drivers/mtd/nand/raw/internals.h             |   9 +
 drivers/mtd/nand/raw/marvell_nand.c          |   4 +-
 drivers/mtd/nand/raw/meson_nand.c            |   2 +-
 drivers/mtd/nand/raw/mtk_nand.c              |   2 +-
 drivers/mtd/nand/raw/nand_base.c             | 187 ++++++++++++++-----
 drivers/mtd/nand/raw/nand_jedec.c            |  19 +-
 drivers/mtd/nand/raw/nand_legacy.c           |   8 +-
 drivers/mtd/nand/raw/nand_micron.c           |  12 +-
 drivers/mtd/nand/raw/nand_onfi.c             |  20 +-
 drivers/mtd/nand/raw/qcom_nandc.c            |   2 +-
 drivers/mtd/nand/raw/stm32_fmc2_nand.c       |   2 +-
 drivers/mtd/nand/raw/sunxi_nand.c            |   2 +-
 drivers/mtd/nand/raw/tango_nand.c            |   2 +-
 drivers/mtd/nand/raw/tegra_nand.c            |   2 +-
 include/linux/mtd/rawnand.h                  |  99 +++++-----
 19 files changed, 256 insertions(+), 124 deletions(-)

-- 
2.20.1


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