The documenting comment of mtd_erase in mtdcore.c states:
Device drivers are supposed to call instr->callback() whenever
the operation completes, even if it completes with a failure.

Currently the callback isn't called in case of failure. Fix this.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

As of commit 807f16d4 ("mtd: core: set some defaults when
dev.parent is set"), the MTD core will set this for us.
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>
Cc: Bayi Cheng <bayi.cheng@mediatek.com>

We can guard against reorganization of struct mtd_part by using
container_of(). We can also make sure we're using the right pointer
types by making this a static inline function instead of a macro.
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

We don't actually need to stash a copy of this device_node indefinitely;
we only need it in brcmnand_init_cs().
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>
Cc: <bcm-kernel-feedback-list@broadcom.com>
Cc: Kamal Dasu <kdasu.kdev@gmail.com>
Acked-by: NScott Branden <sbranden@broadcom.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

It's "ADL" ("ALE to data loading" time) not "ALD".
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>
Reviewed-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

src_ssync_features field is only 1 byte large, and the 4th reserved area
is actually 8 bytes large.

Fixes: d1e1f4e4 ("mtd: nand: add support for reading ONFI parameters from NAND device")
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

The error message was:

m25p80 spi32766.0: unrecognized JEDEC id bytes: 00,  0,  0

The new error message:

m25p80 spi32766.0: unrecognized JEDEC id bytes: 00, 00, 00
Signed-off-by: NRicardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

for_each_child_of_node performs an of_node_get on each iteration, so
a break out of the loop requires an of_node_put.

A simplified version of the semantic patch that fixes this problem is as
follows (http://coccinelle.lip6.fr):

// <smpl>
@@
expression root,e;
local idexpression child;
@@

 for_each_child_of_node(root, child) {
   ... when != of_node_put(child)
       when != e = child
(
   return child;
|
+  of_node_put(child);
?  return ...;
)
   ...
 }
// </smpl>
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Acked-by: NChen-Yu Tsai <wens@csie.org>
Acked-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

This patch addresses two related memory management issues in the probe
function:

1. for_each_available_child_of_node performs an of_node_get on each
iteration, so a break out of the loop requires an of_node_put.

A simplified version of the semantic patch that fixes this problem is as
follows (http://coccinelle.lip6.fr):

// <smpl>
@@
expression root,e;
local idexpression child;
@@

 for_each_available_child_of_node(root, child) {
   ... when != of_node_put(child)
       when != e = child
(
   return child;
|
+  of_node_put(child);
?  return ...;
)
   ...
 }
// </smpl>

2. The devm_kzalloc'd data is not used if brcmnand_init_cs fails.  Free it
immediately, using devm_kfree in this case, instead of waiting for the
remove function.
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

If an error occurs in flash above 4GB in PIO mode then the EXT_ADDR
registers will be set to the location of the error and never cleared.

Reset them to 0 before reading.
Signed-off-by: NSimon Arlott <simon@fire.lp0.eu>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

The linux/mtd/map.h header file is included by a couple of
platform specific files that are built even when CONFIG_MTD
is disabled, and we always get

 warning "No CONFIG_MTD_MAP_BANK_WIDTH_xx selected. No NOR chip support can work"

in that case. This adds an #ifdef around the pointless warning,
as everything is really fine when we don't build the drivers
anyway.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

MTD allows compile-time configuration of the possible CFI geometry
settings that are allowed by the kernel, but that includes a couple of
invalid configurations, where no bank width or no interleave setting
is allowed. These are then caught with a compile-time warning:

include/linux/mtd/cfi.h:76:2: warning: #warning No CONFIG_MTD_CFI_Ix selected. No NOR chip support can work.
include/linux/mtd/map.h:145:2: warning: #warning "No CONFIG_MTD_MAP_BANK_WIDTH_xx selected. No NOR chip support can work"

This is a bit annoying for randconfig tests, and can be avoided if
we change the Kconfig logic to always select the simplest configuration
when no other one is enabled.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

So far struct spi_nor was using just a pointer to struct mtd_info so it
wasn't needed to have it fully defined there. After recent change we
embed whole struct so we need to include a proper header.

Fixes: 19763671 ("mtd: spi-nor: embed struct mtd_info within struct spi_nor")
Signed-off-by: NRafał Miłecki <zajec5@gmail.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

Add spi nor flash driver for mediatek controller
Signed-off-by: NBayi Cheng <bayi.cheng@mediatek.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

All atmel_nand_caps are never modified, consitify them.
Signed-off-by: NLABBE Corentin <clabbe.montjoie@gmail.com>
Acked-by: NJosh Wu <josh.wu@atmel.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

Most parsers can be handled with our new boilerplate-reducing macro.
There are a few that can't be (cmdlineparts and ofpart).

Also kill off the owner assignments, since register_mtd_parser() now
takes care of that.
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

This can help eliminate some boilerplate by generating the module_init()
and module_exit() functions, and by automatically assigning the module
owner.
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

Pull the supported chip names from drivers/mtd/devices/m25p80.c and stop
pointing readers to Linux code.

Also (although I see this habit repeated throughout the
Documentation/devicetree/bindings/ tree), stop using the title "driver"
in this file, when we're trying explicitly to describe hardware, not
software.
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>
Cc: <devicetree@vger.kernel.org>
Acked-by: NRob Herring <robh@kernel.org>
Reviewed-by: NJavier Martinez Canillas <javier@osg.samsung.com>

I overlooked a few comments in commit 8947e396 ("Documentation: dt:
mtd: replace "nor-jedec" binding with "jedec, spi-nor""). Fix these up
now.
Suggested-by: NJavier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>
Reviewed-by: NJavier Martinez Canillas <javier@osg.samsung.com>

Commit 43163022 ("mtd: m25p80: allow arbitrary OF matching for
"jedec,spi-nor"") moved the "jedec,spi-nor" handling from the
spi_device_id table to the of_match_table, to better handle matching
complex device tree compatible strings. With that patch, device tree
support works as expected when m25p80.c is built into the kernel.

However, that commit ignored the fact that:

 (1) (non-DT) platform devices might want to use the "spi-nor" string
     for matching with this driver, rather than picking an arbitrary one
     like "m25p80"
 (2) the core SPI uevent/modalias code doesn't yet support kernel module
     autoloading via of_match_table strings; so for DT-based devices, it
     will only report (part of) the first compatible string used

Problem (1) has been reported previously, and I forgot to patch it up
afterward.

Problem (2) was noticed recently here:
http://lists.infradead.org/pipermail/linux-mtd/2015-October/062369.html
https://lkml.org/lkml/2015/11/12/574

Specifically, this patch fixes m25p80.ko module autoloading for cases
like this:

	flash@xxx {
		compatible = "jedec,spi-nor";
		...
	};

because modalias of "spi:spi-nor" (the only module loading info provided
by the SPI core for this device) will now be listed as an alias in
m25p80.ko.

Notably, it does *not* help cases like this:

	flash@xxx {
		compatible = "vendor,shiny-new-device", "jedec,spi-nor";
		...
	};

unless we also list "shiny-new-device" in m25p_ids[]. There has been
discussion on future work for this issue here:
https://lkml.org/lkml/2015/11/12/574

Cc: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>
Reviewed-by: NJavier Martinez Canillas <javier@osg.samsung.com>

according datasheet both chips can erase 4kByte sectors individually
Signed-off-by: NAndreas Fenkart <andreas.fenkart@dev.digitalstrom.org>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

Just use the spi-nor default instead.
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

Some spi-nor drivers perform sector erase by duplicating their
write_reg() command. Let's not require that the driver fill this out,
and provide a default instead.

Tested on m25p80.c and Medatek's MT8173 SPI NOR flash driver.
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

mtd_to_nand() has been introduced to hide accesses to mtd->priv.
All NAND controller drivers should use it instead of directly accessing
the ->priv field.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

In case other subsystems want to merge in this helper for use in their
drivers, let's bring in that development separately from the rest of
MTD -next development.
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

Some drivers are retrieving the nand_chip pointer using the container_of
macro on a struct wrapping both the nand_chip and the mtd_info struct while
the standard way of retrieving this pointer is through mtd->priv.
Provide an helper to do that.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

The ->priv field of the mtd_info object attached to a nand_chip device
should point to the nand_chip device. The pxa and cafe drivers are
assigning this field their own private structure, which works fine as long
as the nand_chip field is the first one in the driver private struct but
seems a bit fragile.
Fix that by setting mtd->priv to point the nand_chip field and assigning
chip->priv to the private structure head.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

AFAIR this driver was never tested with subpage read support, and this
code is currently unused because we don't set the NAND_SUBPAGE_READ
flag. It can be resurrected if someone tests it properly.
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>
Tested-by: NRay Jui <rjui@broadcom.com>

The read_byte() handling for accessing the flash cache has some awkward
swapping being done in the read_byte() function. Let's just make this a
byte array, and do the swapping with the word-level macros during the
initial buffer copy.

This is just a refactoring patch, with no (intended) functional change.
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>
Cc: Clay McClure <clay@daemons.net>
Cc: Ray Jui <rjui@broadcom.com>
Cc: Scott Branden <sbranden@broadcom.com>
Cc: <bcm-kernel-feedback-list@broadcom.com>
Tested-by: NClay McClure <clay@daemons.net>

It is theoretically possible to probe this driver without a matching
device tree, so let's guard against this.

Also, use the of_device_get_match_data() helper to make this a bit
simpler.

Coverity complained about this one.
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>
Acked-by: NHan xu <han.xu@freescale.com>

This patch correct some representation errors, add a little
clarification in some places, and fix indentation problems
for pseudo code.

It also delete one more white space for one place.
Signed-off-by: NWang YanQing <udknight@gmail.com>
[Brian: a few tweaks]
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

Doing a bit-or operation with zero is pointless.

Remove this unneeded bit-or.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

As Cyrille noted [1], this line is wrong.

[1] http://lists.infradead.org/pipermail/linux-mtd/2015-September/061725.htmlSigned-off-by: NBrian Norris <computersforpeace@gmail.com>
Cc: Cyrille Pitchen <cyrille.pitchen@atmel.com>

do_div() is meant to be used with an unsigned dividend.
Signed-off-by: NNicolas Pitre <nico@linaro.org>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

The NAND clock can be disabled on suspend and enabled on resume.
Signed-off-by: NEzequiel Garcia <ezequiel@vanguardiasur.com.ar>
Acked-by: NRobert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

This macro is not used anymore, so it's just dead code.
Remove it.
Signed-off-by: NEzequiel Garcia <ezequiel@vanguardiasur.com.ar>
Acked-by: NRobert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

Currently, the driver is trying to detect the presence of a chip
by issuing a RESET command before nand_scan_ident. This seems completely
redundant, and is also a layering violation as nand_scan_ident is in charge
of device detection.

This commit removes the RESET command use, and moves the initial
timing configuration to pxa3xx_nand_config_ident.
Signed-off-by: NEzequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

This commit simplifies the initial configuration performed
by pxa3xx_nand_scan. No functionality change is intended.
Signed-off-by: NEzequiel Garcia <ezequiel@vanguardiasur.com.ar>
Acked-by: NRobert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

The Data Flash Control Register (NDCR) contains two types
of parameters: those that are needed for device identification,
and those that can only be set after device identification.

Therefore, the driver can't set them all at once and instead
needs to configure the first group before nand_scan_ident()
and the second group later.

Let's split pxa3xx_nand_config in two halves, and set the
parameters that depend on the device geometry once this is known.
Signed-off-by: NEzequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

The chunk size represents the size of the data chunks, which
is used by the controllers that allow to split transfered data.

However, the initial chunk size is used in a non-splitted way,
during device identification. Therefore, it must be large enough
for all the NAND commands issued during device identification.
This includes NAND_CMD_PARAM which was recently changed to
transfer up to 2048 bytes (for the redundant parameter pages).

Thus, the initial chunk size should be 2048 as well.

On Armada 370/XP platforms (NFCv2) booted without the keep-config
devicetree property, this commit fixes a timeout on the NAND_CMD_PARAM
command:

  [..]
  pxa3xx-nand f10d0000.nand: This platform can't do DMA on this device
  pxa3xx-nand f10d0000.nand: Wait time out!!!
  nand: device found, Manufacturer ID: 0x2c, Chip ID: 0x38
  nand: Micron MT29F8G08ABABAWP
  nand: 1024 MiB, SLC, erase size: 512 KiB, page size: 4096, OOB size: 224
Signed-off-by: NEzequiel Garcia <ezequiel@vanguardiasur.com.ar>
Acked-by: NRobert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>