mtd: chips: Use SPDX license headers

Some of the files in mtd/chips do not have a SPDX license
header, presumably because the text string "GPL'd" didn't
parse with Thomas rulesets for magic license tagging.

Fix this, the code is initially from RedHat which clearly
targeted the Linux kernel and intended it to be GPLv2.

In any case the original author appears to be David
Woodhouse who can then confirm this.

Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20230603185200.3571174-1-linus.walleij@linaro.org

mtd: remove the get_unmapped_area method

It is now unused.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Reviewed-by: Richard Weinberger <richard@nod.at>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: Chris Brandt <chris.brandt@renesas.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

mtd: chips/map_rom.c: implement point and unpoint methods

This will allow for the removal of the get_unmapped_area method later.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: Chris Brandt <chris.brandt@renesas.com>
[rw: fixed build]
Signed-off-by: Richard Weinberger <richard@nod.at>

mtd: map_rom: Support UBI on ROM

UBI needs to know the physical erase block size, even on read-only
devices, since it defines the on-device layout. Use a device-tree
provided value to support previously written UBI on read-only NOR.

UBI also needs a non-zero writebufsize, so we set it to one.

Note: This was implemented because hardware write-protected CFI
NOR cannot be probed for the physical erase block size.

Signed-off-by: Joe Schultz <jschultz@xes-inc.ccom>
Signed-off-by: Aaron Sierra <asierra@xes-inc.ccom>
[Brian: removed unneeded #ifdef, note 'optional' erase-size property]
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

mtd: remove R/O checking duplication

Many drivers check whether the partition is R/O and return -EROFS if yes.
Let's stop having duplicated checks and move them to the API functions
instead.

And again a bit of noise - deleted few too sparse newlines, sorry.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

mtd: add leading underscore to all mtd functions

This patch renames all MTD functions by adding a "_" prefix:

mtd->erase -> mtd->_erase
mtd->read_oob -> mtd->_read_oob
...

The reason is that we are re-working the MTD API and from now on it is
an error to use MTD function pointers directly - we have a corresponding
API call for every pointer. By adding a leading "_" we achieve the following:

1. Make sure we convert every direct pointer users
2. A leading "_" suggests that this interface is internal and it becomes
less likely that people will use them directly
3. Make sure all the out-of-tree modules stop compiling and the owners
spot the big API change and amend them.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

mtd: Remove obsolete <mtd/compatmac.h> include

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

NOMMU: Present backing device capabilities for MTD chardevs

Present backing device capabilities for MTD character device files to allow
NOMMU mmap to do direct mapping where possible.

Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Bernd Schmidt <bernd.schmidt@analog.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

[MTD] map_rom has NULL erase pointer

Which means if inftl or similar are loaded with it (which is a dumb thing
to do admittedly) it may oops.

Closes #8108

[dwmw2: change error to -EROFS to match write-protected flash]
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

MTD/JFFS2: remove CVS keywords

Once upon a time, the MTD repository was using CVS.

This patch therefore removes all usages of the no longer updated CVS
keywords from the MTD code.

This also includes code that printed them to the user.

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

[MTD] replace kmalloc+memset with kzalloc

Signed-off-by: Yan Burman <yan_952@hotmail.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

[MTD] Initialize 'writesize'

Signed-off-by: Artem B. Bityutskiy <dedekind@infradead.org>

[MTD] Restore MTD_ROM and MTD_RAM types

Let's not attempt the abolition of mtd->type until/unless it's properly
thought through. And certainly, let's not do it by halves.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>

[MTD] replace MTD_ROM with MTD_GENERIC_TYPE

No mtd user should ever check for the device type. Instead, device features
should be checked by the flags - if at all.
As a first step towards type removal, change MTD_ROM into MTD_GENERIC_TYPE.

Signed-off-by: Joern Engel <joern@wh.fh-wedel.de>

Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!