linux-kernel - [PATCH v6 0/3] Meson: R/W support for pages used by boot ROM

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Message-ID: <20240507230903.3399594-1-avkrasnov@salutedevices.com>
Date: Wed, 8 May 2024 02:09:00 +0300
From: Arseniy Krasnov <avkrasnov@...utedevices.com>
To: Miquel Raynal <miquel.raynal@...tlin.com>, Richard Weinberger
	<richard@....at>, Vignesh Raghavendra <vigneshr@...com>, Rob Herring
	<robh+dt@...nel.org>, Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, Neil
 Armstrong <neil.armstrong@...aro.org>, Kevin Hilman <khilman@...libre.com>,
	Jerome Brunet <jbrunet@...libre.com>, Martin Blumenstingl
	<martin.blumenstingl@...glemail.com>
CC: <linux-mtd@...ts.infradead.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-amlogic@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <oxffffaa@...il.com>,
	<kernel@...rdevices.ru>, Arseniy Krasnov <avkrasnov@...utedevices.com>
Subject: [PATCH v6 0/3] Meson: R/W support for pages used by boot ROM

Amlogic's boot ROM code needs that some pages on NAND must be written
in special "short" ECC mode with scrambling enabled. Such pages:
1) Contain some metadata about hardware.
2) Located with some interval starting from 0 offset, until some
   specified offset. Interval and second offset are set in the
   device tree.

This patchset adds R/W support for such pages. To enable it we can setup
it in dts:

    nand-is-boot-medium;
    amlogic,boot-pages = <1024>;
    amlogic,boot-page-step = <128>;

It means that each 128th page in range 0 to 1024 pages will be accessed
in special mode ("short" ECC + scrambling). In practice this feature is
needed when we want to update first block of NAND - driver will enable
required mode by itself using value from device tree.

Changelog:
 v1 -> v2:
  * Rename 'meson,boot-page-XXX' -> 'amlogic,boot-page-XXX'.
  * Add words that 'amlogic,boot-page-step' is measured in pages.
  * Remove words that 'amlogic,boot-page-XXX' depends on 'nand-is-boot-medium'.
  * Make both 'amlogic,boot-page-XXX' depend on each other also, in
    addition to 'nand-is-boot-medium' dependency.
 v2 -> v3:
  * Add quotes to 0001 in dependencies. This fixes 'make dt_binding_check'
    warning.
 v3 -> v4:
  * Rename 'amlogic,boot-page-last' to 'amlogic,boot-pages'.
 v4 -> v5:
  * Update 'description' fields in bindings.
 v5 -> v6:
  * Split patch for meson_nand.c to 2 patches: first is refactoring of
    scrambling mode handling, another is support for special pages for
    boot ROM.
  * Update description and commit message in the bindings patch.

Arseniy Krasnov (3):
  dt-bindings: mtd: amlogic,meson-nand: support fields for boot ROM code
  mtd: rawnand: meson: refactor use of 'meson_nfc_cmd_access()'
  mtd: rawnand: meson: read/write access for boot ROM pages

 .../bindings/mtd/amlogic,meson-nand.yaml      | 18 ++++
 drivers/mtd/nand/raw/meson_nand.c             | 86 +++++++++++++------
 2 files changed, 77 insertions(+), 27 deletions(-)

-- 
2.35.0