linux-kernel - [PATCH v6 0/6] mtd: rawnand: add NVIDIA Tegra NAND flash support

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Date:   Thu, 21 Jun 2018 22:31:39 +0200
From:   Stefan Agner <stefan@...er.ch>
To:     boris.brezillon@...tlin.com, dwmw2@...radead.org,
        computersforpeace@...il.com, marek.vasut@...il.com,
        robh+dt@...nel.org, mark.rutland@....com, thierry.reding@...il.com
Cc:     dev@...xeye.de, miquel.raynal@...tlin.com, richard@....at,
        marcel@...wiler.com, krzk@...nel.org, digetx@...il.com,
        benjamin.lindqvist@...ian.se, jonathanh@...dia.com,
        pdeschrijver@...dia.com, pgaikwad@...dia.com, mirza.krak@...il.com,
        gaireg@...reg.de, linux-mtd@...ts.infradead.org,
        linux-tegra@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Stefan Agner <stefan@...er.ch>
Subject: [PATCH v6 0/6] mtd: rawnand: add NVIDIA Tegra NAND flash support

This sixth revision only removes extra OOB byte support when using
HW ECC. The previous implementation did place the ECC bytes at a
different location depending on whether extra OOB bytes were written.
This does not work well with the MTD subsystem. Since UBI/UBIFS does
not require extra OOB bytes I descided to not provide extra OOB
support for now.

--
Stefan

Changes since v1:
- Split controller and NAND chip structure
- Add BCH support
- Allow to select algorithm and strength using device tree
- Improve HW ECC error reporting and use DEC_STATUS_BUF only
- Use SPDX license identifier
- Use per algorithm mtd_ooblayout_ops
- Use setup_data_interface callback for NAND timing configuration

Changes since v2:
- Set clock rate using assigned-clocks
- Use BIT() macro
- Fix and improve timing calculation
- Improve ECC error handling
- Store OOB layout for tag area in Tegra chip structure
- Update/fix bindings
- Use more specific variable names (replace "value")
- Introduce nand-is-boot-medium
- Choose sensible ECC strenght automatically
- Use wait_for_completion_timeout
- Print register dump on completion timeout
- Unify tegra_nand_(read|write)_page in tegra_nand_page_xfer

Changes since v3:
- Implement tegra_nand_(read|write)_raw using DMA
- Implement tegra_nand_(read|write)_oob using DMA
- Name registers according to Tegra 2 Technical Reference Manual (v02p)
- Use wait_for_completion_io_timeout to account for IO
- Get chip select id from device tree reg property
- Clear interrupts and reinit wait queues in case command/DMA times out
- Set default MTD name after nand_set_flash_node
- Move MODULE_DEVICE_TABLE after declaration of tegra_nand_of_match
- Make (rs|bch)_strength static

Changes since v4:
- Pass OOB area to nand_check_erased_ecc_chunk
- Pass algorithm specific bits_per_step to tegra_nand_get_strength
- Store ECC layout in chip structure
- Fix pointer assignment (use NULL)
- Removed obsolete header delay.h
- Fixed newlines
- Use non-_io variant of wait_for_completion_timeout

Changes since v5:
- Drop extra OOB bytes support

Lucas Stach (1):
  ARM: dts: tegra: add Tegra20 NAND flash controller node

Stefan Agner (5):
  mtd: rawnand: add Reed-Solomon error correction algorithm
  mtd: rawnand: add an option to specify NAND chip as a boot device
  mtd: rawnand: tegra: add devicetree binding
  mtd: rawnand: add NVIDIA Tegra NAND Flash controller driver
  ARM: dts: tegra: enable NAND flash on Colibri T20

 .../devicetree/bindings/mtd/nand.txt          |    6 +-
 .../bindings/mtd/nvidia-tegra20-nand.txt      |   64 +
 MAINTAINERS                                   |    7 +
 arch/arm/boot/dts/tegra20-colibri-512.dtsi    |   16 +
 arch/arm/boot/dts/tegra20.dtsi                |   15 +
 drivers/mtd/nand/raw/Kconfig                  |    6 +
 drivers/mtd/nand/raw/Makefile                 |    1 +
 drivers/mtd/nand/raw/nand_base.c              |    4 +
 drivers/mtd/nand/raw/tegra_nand.c             | 1225 +++++++++++++++++
 include/linux/mtd/rawnand.h                   |    7 +
 10 files changed, 1350 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/mtd/nvidia-tegra20-nand.txt
 create mode 100644 drivers/mtd/nand/raw/tegra_nand.c

-- 
2.17.1