Some NAND controllers can assign different NAND timings to different
CS lines. Pass the CS line information to ->setup_data_interface() so
that the NAND controller driver knows which CS line is concerned by
the setup_data_interface() request.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

This commit adjusts the fsmc_nand driver so that it accepts the
NAND_ECC_ON_DIE case. It simply does nothing in this case, since both
the ECC operations and OOB layout will be defined by the NAND chip code
rather than by the NAND controller code.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: NRichard Weinberger <richard@nod.at>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

When timings are no longer provided by the Device Tree, we now use the
SDR timings specified by the NAND flash, and such SDR timings are always
provided. Therefore, it is no longer necessary to keep "default" timings
in the fmsc driver.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

Until now, the fsmc_nand driver was either using controller timings
specified in the Device Tree (through FSMC specific DT properties) or
alternatively default/fallback timings.

This commit implements support to use the timings advertised by the NAND
chip itself, by implementing the ->setup_data_interface() hook. To
preserve backward compatibility, if timings are specified in the Device
Tree, we use the timings from the Device Tree (and don't implement
->setup_data_interface).

Many thanks to Boris Brezillon for coming up with the logic to convert
the NAND chip timings into the timings expected by the FSMC controller.

Also, since the timings are now not only coming from the DT, the message
warning that default timings will be used is removed.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

In preparation for the introduction of support for using SDR timings
exposed by the NAND flash instead of hard-coded timings, this commit
reworks the fsmc_nand_setup() function to take a "struct fsmc_nand_data"
as argument, which already contains the I/O registers base address, bank
and bus width information.

The timings is also currently contained in the "struct fsmc_nand_data",
but we still pass it as a separate argument because the support for
using SDR timings will pass a different value.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

Since commit 4404d7d8 ("mtd: nand: fsmc: remove stale non-DT probe
path"), the fsmc NAND driver only supports Device Tree probing, and
therefore has a "depends on OF" in its Kconfig option.

Due to this the #ifdef CONFIG_OF ... #endif condition in the driver code
is no longer necessary.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

These definitions are not used anywhere in the driver, so remove them.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

This commit switches the fsmc_nand driver from clk_get() to
devm_clk_get(), which saves a few clk_put().
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

Since the driver now only supports DT probing, it doesn't make a lot of
sense to have a private data structure called platform_data, fill it in
with information coming from the DT, and then copying this into the
driver-specific structure fsmc_nand_data.

So instead, we remove fsmc_nand_platform_data entirely, and have
fsmc_nand_probe_config_dt() fill in the fsmc_nand_data structure
directly.

This requires calling fsmc_nand_probe_config_dt() after fsmc_nand_data
has been allocated instead of before.

Also, as an added bonus, we now propagate properly the return value of
fsmc_nand_probe_config_dt() instead of returning -ENODEV on failure. The
error message is also removed, since it no longer made any sense.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

It is already done a few lines before.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

The ->partitions and ->nr_partitions fields of struct
fsmc_nand_platform_data are never set anywhere, so they are always
NULL/0. The corresponding fields in 'struct fsmc_nand_data' are set to the
value of the same fields in fsmc_nand_platform_data, i.e NULL/0.

Therefore, we remove those two fields, and pass NULL/0 directly to
mtd_device_register(), like many other NAND drivers already do.

At the same time, we remove the comment about the fact that we pass
partition info, since we are no longer doing this.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

The read_dma_priv and write_dma_priv fields of fsmc_nand_platform_data
are never set, so this commit removes them.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

host->select_chip used to point to the ->select_bank() function provided
by the platform data, but the latter no longer exists. Therefore
host->select_chip is always NULL.

Due to this, the fsmc_select_chip() does nothing, except:

  chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE);

when chipnr is -1, which is exactly what the default implementation of
->select_chip() does in the NAND framework. So, this commit kills
fsmc_select_chip() entirely.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

Since commit 4404d7d8 ("mtd: nand: fsmc: remove stale non-DT probe
path"), only DT probing is used for the fsmc_nand driver. Due to this,
the ->select_bank() field of fsmc_nand_platform_data is never used, so
this commit gets rid of it.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

This commit simply moves the "struct fsmc_nand_data" definition to be
towards the beginning of the file, with the other defines and type
definitions, instead of in the middle of the driver code. This is much
more consistent with what most Linux drivers do.
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

In commit eea62819 ("mtd: Add device-tree support to fsmc_nand"),
Device Tree support was added to the fmsc_nand driver. However, this
code has a bug in how it handles the bank-width DT property to set the
bus width.

Indeed, in the function fsmc_nand_probe_config_dt() that parses the
Device Tree, it sets pdata->width to either 8 or 16 depending on the
value of the bank-width DT property.

Then, the ->probe() function will test if pdata->width is equal to
FSMC_NAND_BW16 (which is 2) to set NAND_BUSWIDTH_16 in
nand->options. Therefore, with the DT probing, this condition will never
match.

This commit fixes that by removing the "width" field from
fsmc_nand_platform_data and instead have the fsmc_nand_probe_config_dt()
function directly set the appropriate nand->options value.

It is worth mentioning that if this commit gets backported to older
kernels, prior to the drop of non-DT probing, then non-DT probing will
be broken because nand->options will no longer be set to
NAND_BUSWIDTH_16.

Fixes: eea62819 ("mtd: Add device-tree support to fsmc_nand")
Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

The FSMC driver has an execution path and a header file in
<linux/mtd/fsmc.h> that serves to support passing in platform
data through board files, albeit no upstream users of this
mechanism exist.

The header file also contains function headers for functions that
do not exist in the kernel.

Delete this and move the platform data struct, parsing and
handling into the driver, assume we are using OF and make the
driver depend on OF, remove the ifdefs making that optional.

Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Stefan Roese <sr@denx.de>
Cc: Vipin Kumar <vipin.kumar@st.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
Reviewed-by: NStefan Roese <sr@denx.de>
Acked-by: NViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

The nand_scan_ident/tail() returns an appropriate error value when
it fails.  Use it instead of the fixed error code -ENXIO.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: NMarek Vasut <marek.vasut@gmail.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

This value should not be part of nand_ecc_modes_t as it specifies
algorithm not a mode. We successfully managed to introduce new "algo"
field which is respected now.
Signed-off-by: NRafał Miłecki <zajec5@gmail.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

NAND core sets ECC algorithm in algo field now and it should be
preferred over the mode field. This also prepares driver for dropping
NAND_ECC_SOFT_BCH.
Signed-off-by: NRafał Miłecki <zajec5@gmail.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

Now that mtd_ooblayout_ecc() returns the ECC byte position using the
OOB free method, we can get rid of the fsmc_nand_eccplace struct.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

New helpers have been added to avoid directly accessing chip->field. Use
them where appropriate.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
[Brian: fixed a few rebase conflicts]
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

mtd_to_nand() now uses the container_of() approach to transform an
mtd_info pointer into a nand_chip one. Drop useless mtd->priv
assignments from NAND controller drivers.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

struct nand_chip now embeds an mtd device. Make use of this mtd instance.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

Create and use mtd_to_fsmc() to avoid duplication of
container_of(mtd, struct fsmc_nand_data, mtd) calls.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

mtd_to_nand() was recently introduced to avoid direct accesses to the
mtd->priv field. Update all NAND drivers to use it.
Signed-off-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

All of these drivers set up a parser data struct just to communicate DT
partition data. This field has been deprecated and is instead supported
by telling nand_scan_ident() about the 'flash_node'.

This patch:
 * sets chip->flash_node for those drivers that didn't already (but used
   OF partitioning)
 * drops the parser data
 * switches to the simpler mtd_device_register() where possible, now
   that we've eliminated one of the auxiliary parameters

Now that we've assigned chip->flash_node for these drivers, we can
probably rely on nand_dt_init() to do more of the DT parsing for us, but
for now, I don't want to fiddle with each of these drivers. The parsing
is done in duplicate for now on some drivers. I don't think this should
break things. (Famous last words.)

(Rolled in some changes by Boris Brezillon)
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>
Reviewed-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

Used semantic patch with 'make coccicheck MODE=patch COCCI=script.cocci':

---8<----
virtual patch

@@
struct nand_chip *c;
struct device_node *d;
@@
-(c)->flash_node = (d)
+nand_set_flash_node(c, d)
---8<----
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>
Reviewed-by: NMarek Vasut <marex@denx.de>
Reviewed-by: NBoris Brezillon <boris.brezillon@free-electrons.com>

This patch adds support for 4-bit ECC BCH4 for the SPEAr600 SoC. This can
be used by boards equipped with a NAND chip that requires 4-bit ECC
strength. The SPEAr600 HW ECC only supports 1-bit ECC strength.

To enable SW BCH4, you need to specify this in your nand controller
DT node:

	nand-ecc-mode = "soft_bch";
	nand-ecc-strength = <4>;
	nand-ecc-step-size = <512>;

Tested on a custom SPEAr600 board.
Signed-off-by: NStefan Roese <sr@denx.de>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
[Brian: tweaked the comments a bit]
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

Fix a bug where parent device symlinks aren't shown in sysfs.

While at it, make use of the default owner value set by mtdcore.
Signed-off-by: NFrans Klaver <fransklaver@gmail.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

Remove the BUG macros and return with error (if possible) instead.
Signed-off-by: NStefan Roese <sr@denx.de>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

Remove tab in empty line.
Signed-off-by: NStefan Roese <sr@denx.de>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

return type of wait_for_completion_timeout is unsigned long not int. An
appropriately named unsigned long is added and the assignment fixed up.
This not only should help readability but also handles corner cases
properly.
Signed-off-by: NNicholas Mc Guire <hofrat@osadl.org>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

wait_for_completion_timeout does not return negative values so
result handling here does not need to check for negative return.
Signed-off-by: NNicholas Mc Guire <hofrat@osadl.org>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

Without this patch the timings are all set to 0 if not specified in the dts.
With this patch the driver falls back to use the defaults that are already
present in the driver and are known to work okay for some (older) boards.

Tested on a custom SPEAr600 based board.
Signed-off-by: NStefan Roese <sr@denx.de>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Cc: Viresh Kumar <viresh.linux@gmail.com>
Cc: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

A platform_driver does not need to set an owner, it will be populated by the
driver core.
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

The drivers should use dmaengine_terminate_all() API instead of
accessing the device_control which will be deprecated soon
Signed-off-by: NVinod Koul <vinod.koul@intel.com>

Use dev_warn() instead of printk() to provide a better message
to userspace.
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>

The site-specific OOM messages are unnecessary, because they
duplicate the MM subsystem generic OOM message.
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>