linux.git/drivers/mtd/maps/Kconfig, branch v5.14

mtd: physmap: Add Baikal-T1 physically mapped ROM support

2020-10-02T07:08:22+00:00

Baikal-T1 Boot Controller provides an access to a RO storages, which are
physically mapped into the SoC MMIO space. In particularly there are
Internal ROM embedded into the SoC with a pre-installed firmware,
externally attached SPI flash (also accessed in the read-only mode) and a
memory region, which mirrors one of them in accordance with the currently
enabled system boot mode (also called Boot ROM).

This commit adds the Internal ROM support to the physmap driver of the MTD
kernel subsystem. The driver will create the Internal ROM MTD as long as
it is defined in the system dts file. The physically mapped SPI flash
region will be used to implement the SPI-mem interface. The mirroring
memory region won't be accessible directly since it's redundant due to
both bootable regions being exposed anyway.

Note we had to create a dedicated code for the ROMs since read from the
corresponding memory regions must be done via the dword-aligned addresses.

Signed-off-by: Serge Semin 
Cc: Alexey Malahov 
Cc: Pavel Parkhomenko 
Cc: Lee Jones 
Cc: linux-mips@vger.kernel.org
Signed-off-by: Miquel Raynal 
Link: https://lore.kernel.org/linux-mtd/20200920111445.21816-1-Sergey.Semin@baikalelectronics.ru

mtd: Replace HTTP links with HTTPS ones

2020-08-02T20:17:19+00:00

Rationale:
Reduces attack surface on kernel devs opening the links for MITM
as HTTPS traffic is much harder to manipulate.

Deterministic algorithm:
For each file:
  If not .svg:
    For each line:
      If doesn't contain `\bxmlns\b`:
        For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`:
	  If neither `\bgnu\.org/license`, nor `\bmozilla\.org/MPL\b`:
            If both the HTTP and HTTPS versions
            return 200 OK and serve the same content:
              Replace HTTP with HTTPS.

Signed-off-by: Alexander A. Klimov 
Acked-by: Rob Herring 
Signed-off-by: Richard Weinberger

mtd: physmap_of: add a hook for Intel IXP4xx flash probing

2019-10-29T13:24:53+00:00

In order to support device tree probing of IXP4xx NOR flash
chips, a certain big-endian or mixed-endian memory access
pattern need to be used.

I have opted to use the pattern set by previous plug-ins
to physmap for Gemini and Versatile, just override some
functions and reuse most of the physmap core code as it
is to minimize maintenance.

Parts of drivers/mtd/ixp4xx.c are copied into this file.

After we have IXP4xx converted fully to device tree, the
drivers/mtd/ixp4xx.c file will be deleted and this will
be the only access pattern to the IXP4xx flash.

I did not keep the quirk in the flash write function
after probe, where the old code for a while checks for
access to odd addresses, fails and assigns a "faster"
write function once it has convinced probe to only use
2-byte accesses. As we mandate that this device should
be using bank-width = <2> this should not be a problem
unless misconfigured.

Signed-off-by: Linus Walleij 
Signed-off-by: Miquel Raynal

treewide: Add SPDX license identifier - Makefile/Kconfig

2019-05-21T08:50:46+00:00

Add SPDX license identifiers to all Make/Kconfig files which:

 - Have no license information of any form

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

  GPL-2.0-only

Signed-off-by: Thomas Gleixner 
Signed-off-by: Greg Kroah-Hartman

mtd: maps: Allow MTD_PHYSMAP with MTD_RAM

2019-05-06T19:47:01+00:00

When the physmap_of_core.c code was merged into physmap-core.c the
ability to use MTD_PHYSMAP_OF with only MTD_RAM selected was lost.
Restore this by adding MTD_RAM to the dependencies of MTD_PHYSMAP.

Fixes: commit 642b1e8dbed7 ("mtd: maps: Merge physmap_of.c into physmap-core.c")
Cc: 
Signed-off-by: Chris Packham 
Reviewed-by: Hamish Martin 
Signed-off-by: Richard Weinberger

mtd: physmap_of_gemini: Handle pin control

2018-12-06T15:57:13+00:00

This enables the complex mapping for the Gemini and kicks in
custom read/write functions that will wrap the existing
simple functions in calls to enable/disable the parallel
flash pins using pin controls.

This is necessary on some hardware such as the D-Link
DIR-685 where all flash pins are patched in/out at the same
time, but some of the flash pins are in practice unused by
the flash and have anyway been reused as GPIO.

This concerns specifically CE1 on the Gemini. There is only
one flash chip, so only CE0 is used, and the line for CE1
has been reused as chip select for the emulated SPI port
connected to the display. If we try to use the same lines
for flash and GPIO at the same time, one of them will loose:
the GPIO line will disappear because it gets disconnected
from the pin when the flash group is muxed out.

Fix this by introducing two pin control states named simply
"enabled" and "disabled" and only enable the flash lines
when absolutely necessary (during read/write/copy). This
way, they are available for GPIO at all other times and
the display works.

Collect all the state variables in a struct named
struct gemini_flash and allocate this struct at probe
time.

Signed-off-by: Linus Walleij 
Signed-off-by: Boris Brezillon

mtd: maps: Get rid of the latch-addr-flash driver

2018-11-06T22:33:06+00:00

Looks like this driver was initially added to support the NOR on the
DA830-EVM (Davinci) board, but the board file update was never merged.

Keeping unused drivers just adds to the maintenance burden, so let's
remove it if nobody uses it.

Cc: David Griego 
Cc: Aleksey Makarov 
Cc: Sergei Shtylyov 
Cc: Savinay Dharmappa 
Signed-off-by: Boris Brezillon 
Acked-by: Sekhar Nori

mtd: maps: Merge gpio-addr-flash.c into physmap-core.c

2018-11-05T21:24:43+00:00

Controlling some MSB address lines using GPIOs is just a small
deviation from the generic physmap logic, and merging those two drivers
allows us to share most of the probe logic, which is a good thing.

Also, the gpio-addr-flash driver is unused since the removal of
the blackfin arch in v4.17, so we can safely remove the old driver
without risking breaking existing boards.

Signed-off-by: Boris Brezillon 
Reviewed-by: Ricardo Ribalda Delgado 
Tested-by: Ricardo Ribalda Delgado 
Acked-by: Linus Walleij

mtd: maps: Rename physmap_of_{versatile, gemini} into physmap-{versatile, gemini}

2018-11-05T21:24:29+00:00

Now that the physmap_of driver is gone, the gemini and versative
extensions are part of the physmap driver. Rename the source files and
the config option to reflect this.

Signed-off-by: Boris Brezillon 
Reviewed-by: Ricardo Ribalda Delgado 
Acked-by: Linus Walleij

mtd: maps: Merge physmap_of.c into physmap-core.c

2018-11-05T21:24:24+00:00

There's no real reason to have two separate driver for the DT and pdata
case. Just do what we do everywhere else and handle DT and pdata
parsing in the same driver.

Signed-off-by: Boris Brezillon 
Reviewed-by: Ricardo Ribalda Delgado 
Acked-by: Linus Walleij