mtdblock: Add comment about UBI block devices

There is a surprisingly large number of tutorials
that suggest using mtdblock to mount SquashFS filesystems
on flash devices, including NAND devices.

G

mtdblock: Add comment about UBI block devices

There is a surprisingly large number of tutorials
that suggest using mtdblock to mount SquashFS filesystems
on flash devices, including NAND devices.

Given this approach is suboptimal than using UBI, and given
the UBI block device layer was introduced many years ago
specifically with this use case in mind, add a small
comment inviting users and developers to consider UBI block.

Signed-off-by: Ezequiel Garcia <[email protected]>
Signed-off-by: Miquel Raynal <[email protected]>
Link: https://lore.kernel.org/linux-mtd/[email protected]

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mtdblock: Update old JFFS2 mention in Kconfig

JFFS2 can be mounted without 'mtdblock' since
a really, really long time. Some git-log
archaeology shows that in 2006 it was possible
to use 'root=' to

mtdblock: Update old JFFS2 mention in Kconfig

JFFS2 can be mounted without 'mtdblock' since
a really, really long time. Some git-log
archaeology shows that in 2006 it was possible
to use 'root=' to mount a JFFS2 rootfs:

commit e9482b4374e2596e6f3f1ab30c4ea469f4ac6311
Author: Joern Engel <[email protected]>
Date: Tue May 30 14:25:46 2006 +0200

[MTD] Allow alternate JFFS2 mount variant for root filesystem.

With this patch, "root=mtd3" and "root=mtd:foo" work for a JFFS2 rootfs.

However, there are still plenty of tutorials that mention
mtdblock, so users are still taking this route. Update the Kconfig
to reflect this is no longer needed.

Signed-off-by: Ezequiel Garcia <[email protected]>
Signed-off-by: Miquel Raynal <[email protected]>
Link: https://lore.kernel.org/linux-mtd/[email protected]

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mtd: nand: ecc-hamming: Move Hamming code to the generic NAND layer

Hamming ECC code might be later re-used by the SPI NAND layer.

Signed-off-by: Miquel Raynal <[email protected]>
Link: htt

mtd: nand: ecc-hamming: Move Hamming code to the generic NAND layer

Hamming ECC code might be later re-used by the SPI NAND layer.

Signed-off-by: Miquel Raynal <[email protected]>
Link: https://lore.kernel.org/linux-mtd/[email protected]

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mtd: Support kmsg dumper based on pstore/blk

This introduces mtdpstore, which is similar to mtdoops but more
powerful. It uses pstore/blk, and aims to store panic and oops logs to
a flash partition,

mtd: Support kmsg dumper based on pstore/blk

This introduces mtdpstore, which is similar to mtdoops but more
powerful. It uses pstore/blk, and aims to store panic and oops logs to
a flash partition, where pstore can later read back and present as files
in the mounted pstore filesystem.

To make mtdpstore work, the "blkdev" of pstore/blk should be set
as MTD device name or MTD device number. For more details, see
Documentation/admin-guide/pstore-blk.rst

This solves a number of issues:
- Work duplication: both of pstore and mtdoops do the same job storing
panic/oops log. They have very similar logic, registering to kmsg
dumper and storing logs to several chunks one by one.
- Layer violations: drivers should provides methods instead of polices.
MTD should provide read/write/erase operations, and allow a higher
level drivers to provide the chunk management, kmsg dump
configuration, etc.
- Missing features: pstore provides many additional features, including
presenting the logs as files, logging dump time and count, and
supporting other frontends like pmsg, console, etc.

Signed-off-by: WeiXiong Liao <[email protected]>
Link: https://lore.kernel.org/lkml/[email protected]/
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Kees Cook <[email protected]>

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mtd: parsers: Move CMDLINE parser

This moves the CMDLINE partition parser down into the
parser subdirectory. No functional change.

Signed-off-by: Linus Walleij <[email protected]>
Signed-off

mtd: parsers: Move CMDLINE parser

This moves the CMDLINE partition parser down into the
parser subdirectory. No functional change.

Signed-off-by: Linus Walleij <[email protected]>
Signed-off-by: Richard Weinberger <[email protected]>

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mtd: parsers: Move OF parser

This moves the OF/device tree partition parser down into the
parser subdirectory. No functional change.

Signed-off-by: Linus Walleij <[email protected]>
Signed-o

mtd: parsers: Move OF parser

This moves the OF/device tree partition parser down into the
parser subdirectory. No functional change.

Signed-off-by: Linus Walleij <[email protected]>
Signed-off-by: Richard Weinberger <[email protected]>

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mtd: parsers: Move BCM63xx parser

This moves the BCM63xx partition parser down into the
parser subdirectory. No functional change.

Signed-off-by: Linus Walleij <[email protected]>
Signed-off

mtd: parsers: Move BCM63xx parser

This moves the BCM63xx partition parser down into the
parser subdirectory. No functional change.

Signed-off-by: Linus Walleij <[email protected]>
Signed-off-by: Richard Weinberger <[email protected]>

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mtd: parsers: Move BCM47xx parser

This moves the BCM47xx partition parser down into the
parser subdirectory. No functional change.

Signed-off-by: Linus Walleij <[email protected]>
Signed-off

mtd: parsers: Move BCM47xx parser

This moves the BCM47xx partition parser down into the
parser subdirectory. No functional change.

Signed-off-by: Linus Walleij <[email protected]>
Signed-off-by: Richard Weinberger <[email protected]>

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mtd: parsers: Move TI AR7 parser

This moves the TI AR7 partition parser down into the
parser subdirectory. No functional change.

Signed-off-by: Linus Walleij <[email protected]>
Signed-off-b

mtd: parsers: Move TI AR7 parser

This moves the TI AR7 partition parser down into the
parser subdirectory. No functional change.

Signed-off-by: Linus Walleij <[email protected]>
Signed-off-by: Richard Weinberger <[email protected]>

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mtd: Add support for HyperBus memory devices

Cypress' HyperBus is Low Signal Count, High Performance Double Data Rate
Bus interface between a host system master and one or more slave
interfaces. Hyp

mtd: Add support for HyperBus memory devices

Cypress' HyperBus is Low Signal Count, High Performance Double Data Rate
Bus interface between a host system master and one or more slave
interfaces. HyperBus is used to connect microprocessor, microcontroller,
or ASIC devices with random access NOR flash memory (called HyperFlash)
or self refresh DRAM (called HyperRAM).

Its a 8-bit data bus (DQ[7:0]) with Read-Write Data Strobe (RWDS)
signal and either Single-ended clock(3.0V parts) or Differential clock
(1.8V parts). It uses ChipSelect lines to select b/w multiple slaves.
At bus level, it follows a separate protocol described in HyperBus
specification[1].

HyperFlash follows CFI AMD/Fujitsu Extended Command Set (0x0002) similar
to that of existing parallel NORs. Since HyperBus is x8 DDR bus,
its equivalent to x16 parallel NOR flash with respect to bits per clock
cycle. But HyperBus operates at >166MHz frequencies.
HyperRAM provides direct random read/write access to flash memory
array.

But, HyperBus memory controllers seem to abstract implementation details
and expose a simple MMIO interface to access connected flash.

Add support for registering HyperFlash devices with MTD framework. MTD
maps framework along with CFI chip support framework are used to support
communicating with flash.

Framework is modelled along the lines of spi-nor framework. HyperBus
memory controller (HBMC) drivers calls hyperbus_register_device() to
register a single HyperFlash device. HyperFlash core parses MMIO access
information from DT, sets up the map_info struct, probes CFI flash and
registers it with MTD framework.

Some HBMC masters need calibration/training sequence[3] to be carried
out, in order for DLL inside the controller to lock, by reading a known
string/pattern. This is done by repeatedly reading CFI Query
Identification String. Calibration needs to be done before trying to detect
flash as part of CFI flash probe.

HyperRAM is not supported at the moment.

HyperBus specification can be found at[1]
HyperFlash datasheet can be found at[2]

[1] https://www.cypress.com/file/213356/download
[2] https://www.cypress.com/file/213346/download
[3] http://www.ti.com/lit/ug/spruid7b/spruid7b.pdf
Table 12-5741. HyperFlash Access Sequence

Signed-off-by: Vignesh Raghavendra <[email protected]>
Signed-off-by: Miquel Raynal <[email protected]>

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mtd: afs: Move AFS partition parser to parsers subdir

This moves the AFS (ARM Firmware Suite) partition parser
for NOR flash down into the parsers subdirectory.

Signed-off-by: Linus Walleij <linus.

mtd: afs: Move AFS partition parser to parsers subdir

This moves the AFS (ARM Firmware Suite) partition parser
for NOR flash down into the parsers subdirectory.

Signed-off-by: Linus Walleij <[email protected]>
Signed-off-by: Richard Weinberger <[email protected]>

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mtd: bcm63xxpart: move imagetag parsing to its own parser

Move the bcm963xx Image Tag parsing into its own partition parser. This
Allows reusing the parser with different full flash parsers.

While

mtd: bcm63xxpart: move imagetag parsing to its own parser

Move the bcm963xx Image Tag parsing into its own partition parser. This
Allows reusing the parser with different full flash parsers.

While moving it, rename it to bcm963* to better reflect it isn't chip,
but reference implementation specific.

Reviewed-by: Rob Herring <[email protected]>
Signed-off-by: Jonas Gorski <[email protected]>
Reviewed-by: Florian Fainelli <[email protected]>
Signed-off-by: Richard Weinberger <[email protected]>

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mtd: nand: Clarify Kconfig entry for software Hamming ECC entries

The software Hamming ECC correction implementation is referred as
MTD_NAND_ECC which is too generic. Rename it
MTD_NAND_ECC_SW_HAMMI

mtd: nand: Clarify Kconfig entry for software Hamming ECC entries

The software Hamming ECC correction implementation is referred as
MTD_NAND_ECC which is too generic. Rename it
MTD_NAND_ECC_SW_HAMMING. Also rename MTD_NAND_ECC_SMC which is an
SMC quirk in the Hamming implementation as
MTD_NAND_ECC_SW_HAMMING_SMC.

Signed-off-by: Miquel Raynal <[email protected]>

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mtd: add support for reading MTD devices via the nvmem API

Allow drivers that use the nvmem API to read data stored on MTD devices.
For this the mtd devices are registered as read-only NVMEM provide

mtd: add support for reading MTD devices via the nvmem API

Allow drivers that use the nvmem API to read data stored on MTD devices.
For this the mtd devices are registered as read-only NVMEM providers.

We don't support device tree systems for now.

Signed-off-by: Alban Bedel <[email protected]>
[Bartosz:
- include linux/nvmem-provider.h
- set the name of the nvmem provider
- set no_of_node to true in nvmem_config
- don't check the return value of nvmem_unregister() - it cannot fail
- tweaked the commit message]
Signed-off-by: Bartosz Golaszewski <[email protected]>
Acked-by: Boris Brezillon <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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mtd: Move Redboot partition parser

This moves the Redboot partition parser down to the parsers
subdirectory.

Signed-off-by: Linus Walleij <[email protected]>
Signed-off-by: Boris Brezillon <

mtd: Move Redboot partition parser

This moves the Redboot partition parser down to the parsers
subdirectory.

Signed-off-by: Linus Walleij <[email protected]>
Signed-off-by: Boris Brezillon <[email protected]>

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mtd: Kconfig: fix spelling mistake "partions" -> "partition"

Trivial fix to spelling mistake in the Kconfig text

Signed-off-by: Colin Ian King <[email protected]>
Signed-off-by: Boris Brezil

mtd: Kconfig: fix spelling mistake "partions" -> "partition"

Trivial fix to spelling mistake in the Kconfig text

Signed-off-by: Colin Ian King <[email protected]>
Signed-off-by: Boris Brezillon <[email protected]>

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mtd: Make Kconfig formatting consistent

Fix indentation and replace '---help---' by 'help' to make things
consistent.

Signed-off-by: Boris Brezillon <[email protected]>
Reviewed-by: Mique

mtd: Make Kconfig formatting consistent

Fix indentation and replace '---help---' by 'help' to make things
consistent.

Signed-off-by: Boris Brezillon <[email protected]>
Reviewed-by: Miquel Raynal <[email protected]>

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mtd: Move onenand code base to drivers/mtd/nand/onenand

Move onenand code base to the drivers/mtd/nand directory in the hope
that someday someone will patch it to use the generic NAND helpers.
If it

mtd: Move onenand code base to drivers/mtd/nand/onenand

Move onenand code base to the drivers/mtd/nand directory in the hope
that someday someone will patch it to use the generic NAND helpers.
If it never happens, at least we'll have all NAND related support in a
single directory and not spread over the drivers/mtd/ directory.

Signed-off-by: Boris Brezillon <[email protected]>

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kconfig: kill off GENERIC_IO option

The GENERIC_IO option is set for every architecture except tile and score
as those define NO_IOMEM. The option only controls visibility of
CONFIG_MTD which doesn'

kconfig: kill off GENERIC_IO option

The GENERIC_IO option is set for every architecture except tile and score
as those define NO_IOMEM. The option only controls visibility of
CONFIG_MTD which doesn't appear to be necessary for any reason, so let's
just remove GENERIC_IO.

Signed-off-by: Rob Herring <[email protected]>
Cc: Jeff Dike <[email protected]>
Cc: Richard Weinberger <[email protected]>
Cc: David Woodhouse <[email protected]>
Cc: Brian Norris <[email protected]>
Cc: Boris Brezillon <[email protected]>
Cc: Marek Vasut <[email protected]>
Cc: Cyrille Pitchen <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Acked-by: Richard Weinberger <[email protected]>
Acked-by: Boris Brezillon <[email protected]>
Signed-off-by: Richard Weinberger <[email protected]>

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mtd: extract TRX parser out of bcm47xxpart into a separated module

This makes TRX parsing code reusable with other platforms and parsers.

Please note this patch doesn't really change anything in th

mtd: extract TRX parser out of bcm47xxpart into a separated module

This makes TRX parsing code reusable with other platforms and parsers.

Please note this patch doesn't really change anything in the existing
code, just moves it. There is still some place for improvement (e.g.
working on non-hacky method of checking rootfs format) but it's not
really a subject of this change.

Signed-off-by: Rafał Miłecki <[email protected]>
Signed-off-by: Brian Norris <[email protected]>

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mtd: bcm63xxpart: Remove dependency on mach-bcm63xx

Read nvram directly from flash instead of using the in-memory copy that
mach-bcm63xx has, to remove the dependency on mach-bcm63xx and allow the
p

mtd: bcm63xxpart: Remove dependency on mach-bcm63xx

Read nvram directly from flash instead of using the in-memory copy that
mach-bcm63xx has, to remove the dependency on mach-bcm63xx and allow the
parser to work on bmips too.

Rename remaining BCM63XX defines to BCM963XX as these are properties of
the flash layout on the board.

BCM963XX_DEFAULT_PSI_SIZE changes from SZ_64K to 64 because it will be
multiplied by SZ_1K later on.

Signed-off-by: Simon Arlott <[email protected]>
Signed-off-by: Brian Norris <[email protected]>

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mtd: enable AFS selection for ARM64

ARM use their special partitions also on the ARM64 architecture
reference designs, so enable this for ARM64.

Cc: Ryan Harkin <[email protected]>
Cc: Liviu D

mtd: enable AFS selection for ARM64

ARM use their special partitions also on the ARM64 architecture
reference designs, so enable this for ARM64.

Cc: Ryan Harkin <[email protected]>
Cc: Liviu Dudau <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Signed-off-by: Brian Norris <[email protected]>

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mtd: part: Create the master device node when partitioned

For many use cases, it helps to have a device node for the entire
MTD device as well as device nodes for the individual partitions.
For exam

mtd: part: Create the master device node when partitioned

For many use cases, it helps to have a device node for the entire
MTD device as well as device nodes for the individual partitions.
For example, this allows querying the entire device's properties.
A common idiom is to create an additional partition which spans
over the whole device.

This patch makes a config option, CONFIG_MTD_PARTITIONED_MASTER,
which makes the master partition present even when the device is
partitioned. This isn't turned on by default since it presents
a backwards-incompatible device numbering.

The patch also makes the parent of a partition device be the master,
if the config flag is set, now that the master is a full device.

Signed-off-by: Dan Ehrenberg <[email protected]>
Signed-off-by: Brian Norris <[email protected]>

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mtd: update help of CONFIG_MTD_OF_PARTS

The help text of CONFIG_MTD_OF_PARTS refers to additional documentation
in booting-without-of.txt but this documentation was moved to another
file in commit e

mtd: update help of CONFIG_MTD_OF_PARTS

The help text of CONFIG_MTD_OF_PARTS refers to additional documentation
in booting-without-of.txt but this documentation was moved to another
file in commit efcc2da3fd148c9acb7d7cf1d9800e0649f950fc (Stefan Roese:
Factor MTD physmap bindings out of booting-without-of). This updates the
help text to point to the right place.

Signed-off-by: Michal Sojka <[email protected]>
[Brian: fixed doc reference]
Signed-off-by: Brian Norris <[email protected]>

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mtd: spi-nor: add the framework for SPI NOR

This patch cloned most of the m25p80.c. In theory, it adds a new spi-nor layer.

Before this patch, the layer is like:

MTD
--

mtd: spi-nor: add the framework for SPI NOR

This patch cloned most of the m25p80.c. In theory, it adds a new spi-nor layer.

Before this patch, the layer is like:

MTD
------------------------
m25p80
------------------------
spi bus driver
------------------------
SPI NOR chip

After this patch, the layer is like:
MTD
------------------------
spi-nor
------------------------
m25p80
------------------------
spi bus driver
------------------------
SPI NOR chip

With the spi-nor controller driver(Freescale Quadspi), it looks like:
MTD
------------------------
spi-nor
------------------------
fsl-quadspi
------------------------
SPI NOR chip

New APIs:
spi_nor_scan: used to scan a spi-nor flash.

Signed-off-by: Huang Shijie <[email protected]>
Acked-by: Marek Vasut <[email protected]>
[Brian: rebased to include additional m25p_ids[] entry]
Signed-off-by: Brian Norris <[email protected]>

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