read_page_raw and write_page_raw method description is not clear enough.
It clearly specifies that ECC correction should not be involved but does
not talk about specific layout (by layout I mean where in-band and
out-of-band data are stored on the NAND media) used by NAND/ECC
controllers.

Those specific layouts might impact MTD users and thus should be hidden (as
already done in the standard NAND_ECC_HW_SYNDROME implementation).

Clearly state this constraint in the nand_ecc_ctrl struct documentation.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

It is common for NAND devices to have bitflip errors.
Add a bitflip_limit parameter to specify how many bitflips per
page we can tolerate without flagging an error.
By default zero bitflips are tolerated.
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

Add a function memcmpshow() that compares the 2 data buffers
and shows the address:offset and data bytes on comparison failure.
This function  does not break at a comparison failure but runs the
check for the whole data buffer.

Use memcmpshow() instead of memcmp() for all the verification paths.
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

Freescale's QorIQ T Series processors support 8 IFC chip selects
within a memory map backward compatible with previous P Series
processors which supported only 4 chip selects.
Signed-off-by: Aaron Sierra <asierra@xes-inc.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

If there is no PMECC lookup table stored in ROM, or lookup table offset is
not specified, PMECC driver should build it in DDR by itself.

That make the PMECC driver work for some board which doesn't have PMECC
lookup table in ROM.

The PMECC use the BCH algorithm, so based on the build_gf_tables()
function in lib/bch.c, we can build the Galois Field lookup table.

For more information can refer to section 5.4 of PMECC controller
application note:
	http://www.atmel.com/images/doc11127.pdfSigned-off-by: Josh Wu <josh.wu@atmel.com>
Cc: devicetree@vger.kernel.org
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

The driver was also using own method to do 32bit copy, turns out
we have a kernel API so use that instead
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

The ->PUtable[] array has "->nb_blocks" number of elemetns so this
comparison should be ">=" instead of ">".  Otherwise it could result in
a minor read beyond the end of an array.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

Add sst25wf080 to the spi-nor device id table.
Signed-off-by: Harini Katakam <harinik@xilinx.com>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

Tested with this particular FRAM chip
Signed-off-by: Rostislav Lisovy <lisovy@merica.cz>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

The AM335x Technical Reference Manual (spruh73j.pdf) says
"Because the ECC engine includes only one accumulation context,
it can be allocated to only one chip-select at a time ... "
(7.1.3.3.12.3). Since the commit 97a288ba ("ARM: omap2+:
gpmc-nand: Use dynamic platform_device_alloc()") gpmc-nand
driver supports multiple NAND flash devices connected to
the single controller.
Use global 'struct nand_hw_control' among multiple NAND
instances to synchronize the access to the single ECC Engine.

Tested with custom AM335x board using 2x NAND flash chips.
Signed-off-by: Rostislav Lisovy <lisovy@merica.cz>
Acked-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

Because n25q032 is the Micron SPI chip, move it to Micron
devices list group. In order that know which Micron SPI
chips have been support at a glance.
Signed-off-by: Chunhe Lan <Chunhe.Lan@freescale.com>
Cc: Brian Norris <computersforpeace@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Huang Shijie <shijie8@gmail.com>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

We are trying to remove the legacy tx_dma and rx_dma fields from the
spi_transfer structure. Currently dataflash uses tx_dma but only to make
sure that it's set to 0 so we can remove this use by replacing with a
zero initialisation of the entire spi_transfer struct.
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

We don't need to expose a 'wait-till-ready' interface to drivers. Status
register polling should be handled by the core spi-nor.c library, and as
of now, I see no need to provide a special driver-specific hook for it.
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Reviewed-by: Marek Vasut <marex@denx.de>

spi-nor.c should be taking care of these now.
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Cc: Huang Shijie <b32955@freescale.com>
Reviewed-by: Marek Vasut <marex@denx.de>

spi-nor.c should be taking care of these now.
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Reviewed-by: Marek Vasut <marex@denx.de>

We shouldn't have *every* function checking if a previous write is
complete; this should be done synchronously after each write/erase.
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Reviewed-by: Marek Vasut <marex@denx.de>

The error label was unused here. It looks like we're missing at least
one case that should be doing 'goto write_err'.
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Acked-by: Huang Shijie <shijie8@gmail.com>

These functions were near-carbon-copies due to a small per-flash quirk.
Let's add a new spi_nor::flags bitfield to support these types of
quirks.
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Cc: Graham Moore <grmoore@altera.com>
Cc: Huang Shijie <shijie8@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

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 efcc2da3 (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 <sojkam1@fel.cvut.cz>
[Brian: fixed doc reference]
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

update a comment in nand_command_lp() about specific requirements of
individual commands, the DEPLETE1 command was removed in the past and
the comment no longer applied
Signed-off-by: Gerhard Sittig <gsi@denx.de>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

For the DDR Quad read, the dummy cycles maybe 3 or 6 which is less then 8.
The dummy cycles is actually 8 for SPI fast/dual/quad read.

This patch makes preparations for the DDR quad read, it fixes the wrong dummy
value for both the spi-nor.c and m25p80.c.
Signed-off-by: Huang Shijie <b32955@freescale.com>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

NAND devices with page sizes over 4 KiB require more than 4-bits of ECC
coverage. This patch calculates the value of ecc_bytes based on a still
assumed 512-byte step size (13-bits) and the ecc_strength.

Example:
Micron M73A devices (8 KiB page) require 8-bit ECC per 512-byte
Signed-off-by: Jordan Friendshuh <jfriendshuh@xes-inc.com>
Signed-off-by: Aaron Sierra <asierra@xes-inc.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

The drivers/mtd/nand/gpio.c driver does not GPIO bitbang the complete
NAND protocol, but instead is GPIO _assisted_ -- a memory mapped interface
communicates commands and data, and only few control signals are connected
to GPIO pins.

Expand comments in the driver source and in the Kconfig description to
better reflect the very nature of the driver.  The previous text could be
mistaken for complete GPIO bitbanging.
Signed-off-by: Gerhard Sittig <gsi@denx.de>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

Expand the description of the 'gpios' property in the GPIO assisted
NAND flash binding, to explicitly list the required GPIO pin references
and their order.

Update the example section to individually bracket the GPIO references,
and capitalize the signal names for improved readability.
Signed-off-by: Gerhard Sittig <gsi@denx.de>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

To keep the two paths in sync

After '#echo mem > /sys/power/state' some devices can not be properly resumed
because apparently the MTD Partition Configuration Register has been reset
to default thus the rootfs cannot be mounted cleanly on resume.
An example of this can be found in the SA-1100 Developer's Manual at 9.5.3.3
where the second step of the Sleep Shutdown Sequence is described:
"An internal reset is applied to the SA-1100. All units are reset...".

As workaround we refresh the PCR value as done initially on chip setup.

This behavior and the fix are confirmed by our tests done on 2 different Zaurus
collie units with kernel 3.17.

Fixes: 812c5fa8: ("mtd: cfi_cmdset_0001.c: add support for Sharp LH28F640BF NOR")
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
Cc: <stable@vger.kernel.org> # 3.16+
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

Since commit 6d178ef2 ("mtd: nand: Move ELM driver and rename as
omap_elm"), I don't have any mtd devices present on my am335x. This
changes the link order of the omap_elm and omap2 objects, causing them
to probe in the wrong order.

To fix this, make elm_config defer probing until the omap_elm driver is
actually loaded.
Signed-off-by: Frans Klaver <frans.klaver@xsens.com>
Acked-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

Add the sunxi NAND Flash Controller dt bindings documentation.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

Add support for the sunxi NAND Flash Controller (NFC).
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
[Brian: tweaked to fix ecc->steps issue]
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

nandsim can simulate NAND Flash which returns the ID bytes specified
by first_id_byte, ..., fourth_id_byte module parameters.

In order to simulate NAND flash which returns more than four ID bytes,
this adds id_bytes module parameter which is specified by the array of
byte like this:

 # modprobe nandsim id_bytes=0x98,0xdc,0x90,0x26,0x76,0x15,0x01,0x08 bch=1

This doesn't add fifth_id_byte, ..., seventh_id_byte module parameters,
because they are redundant.  But the existing first_id_byte, ...,
fourth_id_byte module parameters are preserved and add "(obsolete)" to
the description.

Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Brian Norris <computersforpeace@gmail.com>
Cc: linux-mtd@lists.infradead.org
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

With CONFIG_OF=n, we can see the following warning:

   drivers/mtd/devices/docg3.c:2122:28: warning: 'docg3_dt_ids' defined but not used [-Wunused-variable]
    static struct of_device_id docg3_dt_ids[] = {
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>

Sometimes the trx offsets are 0, in that case there is no partition and
we should not try to add one.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
[Brian: rewrapped]
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

Modify phram to include <linux/io.h> rather than <asm/io.h>
Signed-off-by: Rob Ward <robert.ward114@googlemail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

When clk_prepare_enable(q->clk) fails it is clearer to disable the previous
acquired clock (q->clk_en) in the error path rather than doing it locally.

So disable q->clk_en in the error path only.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Huang Shijie <shijie8@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

The 'map_failed' label will return 'ret', so we need to assign the error
code to 'ret', otherwise the probe function will return success.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Huang Shijie <shijie8@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

This replaces kzalloc() and ioremap() calls by devm_ functions
in the probe() routine, which automatically release the corresponding
resources when probe() fails or when the device is removed.

This simplifies simplifies the error management code, and brings
the below improvements or changes:

A. Fixing a bug reported by "make coccicheck":

If "board = devm_kzalloc()" fails, the probe() function jumps
incorrectly to label "no_res" and therefore returns without
running iounmap().

B. Requesting the memory region

Using devm_ioremap_resource() makes the probe() function request
the corresponding memory region before running ioremap(), as
it is supposed to do.

C. Standardizing the error codes:

The use of devm_ioremap_resource() changes the return value:
 * -ENOMEM instead of -EIO in case of ioremap() failure,
 * -EINVAL instead of -ENODEV in case of platform_get_resource()
   failure.
Signed-off-by: Michael Opdenacker <michael.opdenacker@free-electrons.com>
Reviewed-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

This is needed for some new Netgear devices (e.g. R6250).
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

fs/jffs2/summary.c:846:5: warning: context imbalance in 'jffs2_sum_write_sumnode' - unexpected unlock
Suggested-by: Brian Norris <computersforpeace@gmail.com>
Suggested-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

Avoid the following compile warning:

drivers/mtd/maps/bfin-async-flash.c: In function 'bfin_flash_probe':
drivers/mtd/maps/bfin-async-flash.c:129: warning: unused variable 'ret'
Signed-off-by: Aaron Sierra <asierra@xes-inc.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

Add documentation for the sandisk docg3 chip.
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: devicetree@vger.kernel.org
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>