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drivers/mtd/nvmxip: introduce NVM XIP block storage emulation

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add block storage emulation for NVM XIP flash devices

Some paltforms such as Corstone-1000 need to see NVM XIP raw flash
as a block storage device with read only capability.

Here NVM flash devices are devices with addressable
memory (e.g: QSPI NOR flash).

The implementation is generic and can be used by different platforms.

Two drivers are provided as follows.

  nvmxip-blk :

    a generic block driver allowing to read from the XIP flash

  nvmxip Uclass driver :

        When a device is described in the DT and associated with
        UCLASS_NVMXIP, the Uclass creates a block device and binds it with
	 the nvmxip-blk.

Platforms can use multiple NVM XIP devices at the same time by defining a
DT node for each one of them.

Signed-off-by: Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>
This commit is contained in:
Abdellatif El Khlifi
2023-04-17 10:11:52 +01:00
committed by Tom Rini
parent b197f1f05d
commit f37af2760e
12 changed files with 298 additions and 0 deletions
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48
doc/develop/driver-model/nvmxip.rst Normal file
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.. SPDX-License-Identifier: GPL-2.0+
NVM XIP Block Storage Emulation Driver
=======================================
Summary
-------
Non-Volatile Memory devices with addressable memory (e.g: QSPI NOR flash) could
be used for block storage needs (e.g: parsing a GPT layout in a raw QSPI NOR flash).
The NVMXIP Uclass provides this functionality and can be used for any 64-bit platform.
The NVMXIP Uclass provides the following drivers:
nvmxip-blk block driver:
A generic block driver allowing to read from the XIP flash.
The driver belongs to UCLASS_BLK.
The driver implemented by drivers/mtd/nvmxip/nvmxip.c
nvmxip Uclass driver:
When a device is described in the DT and associated with UCLASS_NVMXIP,
the Uclass creates a block device and binds it with the nvmxip-blk.
The Uclass driver implemented by drivers/mtd/nvmxip/nvmxip-uclass.c
The implementation is generic and can be used by different platforms.
Supported hardware
--------------------------------
Any 64-bit plaform.
Configuration
----------------------
config NVMXIP
This option allows the emulation of a block storage device
on top of a direct access non volatile memory XIP flash devices.
This support provides the read operation.
This option provides the block storage driver nvmxip-blk which
handles the read operation. This driver is HW agnostic and can support
multiple flash devices at the same time.
Contributors
------------
* Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com>