This is not a serial flash driver, but a nand flash driver
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

When platform_driver_probe() is used and no device is registered for
this driver -ENODEV is returned and and error message is shown. Not all
BCM47xx SoC have a serial flash chip controller and chip and for them
an error message was shown.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

The callback assumes the number of read bytes is written to retlen.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

We do the check based on the following two facts:

[1] The mx23/mx28 can only support 20-bits ECC, while the mx6
    can supports 40-bits ECC.

[2] The mx23/mx28 can only support the GF13, while the mx6
    can supports GF13 and GF14.
Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

The GF13 can be only used in the following case:
    The ECC data chunk is less then 1K bytes.

In mx23/mx28, the ecc data chunk is 512 bytes. So it is okay.

But in mx6q, we begin to use some large nand chip whose ecc
data chunk maybe 1K bytes long.  So when the data chunk is 1K bytes,
we have to use the GF14.

This patch sets the Golois Field bit when the GF14 is needed.
Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

As part of removing generalized dependency, replace <xx> literal fields
in DT compatible field with <52> for am335x platforms.
Signed-off-by: Philip Avinash <avinashphilip@ti.com>
Acked-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

The patch "490e280a mtd: gpmi-nand: Convert to module_platform_driver()"
introduced a "dereferencing freed memory" error.

This patch fixes it.
Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

The panic_nand_wait() expects the timeo in ms and not in jiffies.
But in nand_wait(), the timeo for panic_nand_wait() is assigned with
wrong value(jiffies + some delay). The timeo should be set like the
panic_nand_write() does.

This patch passes timeo in ms to panic_nand_wait().
And this patch also passes timeo in jiffies(converted by msecs_to_jiffies)
to time_before() which makes the code more readable.
Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

Currently cfi_cmdset_0002.c does not support PPB locking of sectors. This
patch adds support for this locking/unlocking mechanism. It is needed on
some platforms, since newer U-Boot versions do support this PPB locking
and protect for example their environment sector(s) this way.

This PPB locking/unlocking will be enabled for all devices supported by
cfi_cmdset_0002 reporting 8 in the CFI word 0x49 (Sector Protect/Unprotect
scheme).

Please note that PPB locking does support sector-by-sector locking. But
the whole chip can only be unlocked together. So unlocking one sector
will automatically unlock all sectors of this device. Because of this
chip limitation, the PPB unlocking function saves the current locking
status of all sectors before unlocking the whole device. After unlocking
the saved locking status is re-configured. This way only the addressed
sectors will be unlocked.

To selectively enable this advanced sector protection mechanism, the
device-tree property "use-advanced-sector-protection" has been created.
To enable support for this locking this property needs to be present in the
flash DT node. E.g.:

nor_flash@0,0 {
	compatible = "amd,s29gl256n", "cfi-flash";
	bank-width = <2>;
	use-advanced-sector-protection;
	...

Tested with Spansion S29GL512S10THI and Micron JS28F512M29EWx flash
devices.
Signed-off-by: Stefan Roese <sr@denx.de>
Tested-by: Holger Brunck <holger.brunck@keymile.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

All other partitioning schemes can be compiled as modules
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

Dump the BCH registers in gpmi_dump_info().
Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

Add the function name to the error message.

These messages are not very helpful:

[183356.176682] uncorrectable error :
[183356.180273] uncorrectable error :
[183356.184194] uncorrectable error :
[183356.187773] uncorrectable error :
[183356.191280] uncorrectable error :

Artem: amended the patch a bit
Signed-off-by: Tormod Volden <debian.tormod@gmail.com>

in/out_be32 accessors are Power arch centric whereas
ioread/writebe32 are available in other arches.

Since the IFC device registers are annotated big endian in
fsl_ifc.h, the accessor annotations now match, resulting in the
pleasant side-effect of this patch silencing sparse endian
warnings such as the following:

drivers/mtd/nand/fsl_ifc_nand.c:179:19: warning: incorrect type in argument 1 (different base types)
drivers/mtd/nand/fsl_ifc_nand.c:179:19:    expected unsigned int volatile [noderef] [usertype] <asn:2>*addr
drivers/mtd/nand/fsl_ifc_nand.c:179:19:    got restricted __be32 [noderef] <asn:2>*<noident>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

I was (at least) the second person trying to fix a warning by sparse, so
document in the code why this is a bad idea and add an extern declaration to
make sparse happy.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

This allows to put the filesystem at a defined address in ROM allowing
to save more precious RAM.

I think it's safe to default to ROM because the intention of using the
uclinux map is to use a romfs and so mtd-ram doesn't give you anything
that mtd-rom doesn't.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

It's required for accessing trx header (usually re-calculating a
checksum) and for writing a new firmware.
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

Add support for GigaDevice GD25Q32 32 Mbit (4 MB) SPI Flash (see datasheet:
http://www.gigadevice.com/UserFiles/GD25Q32_Rev0.2(1).pdf) used in Hame MPR-A1
and clones, and for GigaDevice GD25Q64 64 Mbit (8 MB) SPI Flash used in
Hame MPR-A2 devices (datasheet: http://www.gigadevice.com/UserFiles/GD25Q64.pdf).
Signed-off-by: Michel Stempin <michel.stempin@wanadoo.fr>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

ELM module can be used for hardware error correction of BCH 4 & 8 bit.
ELM module functionality is verified by checking the availability of
handle for ELM module in device tree. Hence supporting
1. ELM module available, BCH error correction done by ELM module. Also
support read & write page in one shot by adding custom read_page and
write_page methods. This helps in optimizing code for NAND flashes with
page size less than 4 KB.
2. If ELM module not available fall back to software BCH error
correction support.

New structure member is added to omap_nand_info
1. "is_elm_used" to know the status of whether the ELM module is used for
   error correction or not.
2. "elm_dev" device pointer to elm device on detection of ELM module.

Also being here update the device tree documentation of gpmc-nand for
adding optional property elm_id.

Note:
ECC layout uses 1 extra bytes for 512 byte of data to handle erased
pages. Extra byte programmed to zero for programmed pages. Also BCH8
requires 14 byte ecc to maintain compatibility with RBL ECC layout.
This results a common ecc layout across RBL, U-boot & Linux with BCH8.
Signed-off-by: Philip Avinash <avinashphilip@ti.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

The ELM hardware module can be used to speedup BCH 4/8/16 ECC scheme
error correction.
For now only 4 & 8 bit support is added
Signed-off-by: Philip Avinash <avinashphilip@ti.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

Remove check of ecc bytes with 13, number of errors can directly update
from nand ecc strength. This will increase re-usability of the code.
Also add macro definitions BCH8_ERROR_MAX & BCH4_ERROR_MAX for better
readability and cleaner code.
Signed-off-by: Philip Avinash <avinashphilip@ti.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

Also compress the id in case of a v3 NAND flash controller (i.mx51, i.mx53)
and 16Bit buswidth.
Signed-off-by: Roman Schneider <schneider@at.festo.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

This patch adds generic support for flash protection on STmicro chips.
On chips with less than 3 protection bits, the unused bits are don't cares
and so can be written anyway. The lock function will only change the
protection bits if it would not unlock other areas. Similarly, the unlock
function will not lock currently unlocked areas. Tested on the m25p64.
Signed-off-by: Austin Boyle <Austin.Boyle@aviatnet.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

Use more preferable function name which implies using a pseudo-random
number generator.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

/proc/mtd doesn't contain the mtd-id of the device, but the part name from the
command line.  This corrects what I believe is an obsolete comment from commit
a0ee24a0.
Signed-off-by: Christopher Cordahi <christophercordahi@nanometrics.ca>
Cc: Philip Rakity <prakity@yahoo.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

The mtd documentation makes no mention of the useful feature whereby
partitions' logical ordering need not match their physical ordering.
Truncation of parts, skipping of zero sized parts, and handling of
overlapping parts are similarly not mentioned.

This updates the comments at the top of file describing the command
line parsing as currently implemented.   I proposed this in
http://lists.infradead.org/pipermail/linux-mtd/2012-December/045314.htmlSigned-off-by: Christopher Cordahi <christophercordahi@nanometrics.ca>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

Perform flash size truncation before skipping zero sized partition
so that if the result is a zero sized, it will be skipped like the
others.
Signed-off-by: Christopher Cordahi <christophercordahi@nanometrics.ca>
Acked-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

Decrement index i after skipping a zero sized partition.  On next loop
iteration, the index will be the same as before, but the data will be
new as it was moved when earlier partition was skipped.
Signed-off-by: Christopher Cordahi <christophercordahi@nanometrics.ca>
Acked-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

Always report corrected and failed ECC stats back up to the MTD layer.  Also
return max_bitflips from read_page() as is expected from NAND drivers now.
Signed-off-by: Zach Sadecki <zsadecki@itwatchdogs.com>
Acked-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

Fix missing dependency which can cause a build error such
as: ERROR: "byte_rev_table" [drivers/mtd/devices/docg3.ko]
undefined!
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

Commit cdeadd71 (mtd: nand: davinci: add OF
support for davinci nand controller) has never been really build tested with
the driver as a module.  When the driver is built-in, the missing semicolon
after structure initializer is "compensated" by MODULE_DEVICE_TABLE() macro
being empty and so the initializer using the trailing semicolon on the next
line; when the driver is built as a module, compilation error ensues, and as
the 'davinci_all_defconfig' has the NAND driver modular, this error prevents
DaVinci family kernel from building...
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Cc: stable@vger.kernel.org # 3.7

Pull more device-mapper fixes from Alasdair G Kergon:
 "A fix for stacked dm thin devices and a fix for the new dm WRITE SAME
  support."

* tag 'dm-3.8-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm:
  dm: fix write same requests counting
  dm thin: fix queue limits stacking

PullHID fixes from Jiri Kosina:

 - fix i2c-hid and hidraw interaction, by Benjamin Tissoires

 - a quirk to make a particular device (Formosa IR receiver) work
   properly, by Nicholas Santos

* 'for-3.8/upstream-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid:
  HID: i2c-hid: fix i2c_hid_output_raw_report
  HID: usbhid: quirk for Formosa IR receiver
  HID: remove x bit from sensor doc

Pull NFS client bugfixes from Trond Myklebust:

 - Error reporting in nfs_xdev_mount incorrectly maps all errors to
   ENOMEM

 - Fix an NFSv4 refcounting issue

 - Fix a mount failure when the server reboots during NFSv4 trunking
   discovery

 - NFSv4.1 mounts may need to run the lease recovery thread.

 - Don't silently fail setattr() requests on mountpoints

 - Fix a SUNRPC socket/transport livelock and priority queue issue

 - We must handle NFS4ERR_DELAY when resetting the NFSv4.1 session.

* tag 'nfs-for-3.8-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFSv4.1: Handle NFS4ERR_DELAY when resetting the NFSv4.1 session
  SUNRPC: When changing the queue priority, ensure that we change the owner
  NFS: Don't silently fail setattr() requests on mountpoints
  NFSv4.1: Ensure that nfs41_walk_client_list() does start lease recovery
  NFSv4: Fix NFSv4 trunking discovery
  NFSv4: Fix NFSv4 reference counting for trunked sessions
  NFS: Fix error reporting in nfs_xdev_mount

Pull MIPS updates from Ralf Baechle:
 "A number of fixes all across the MIPS tree.  No area is particularly
  standing out and things have cooled down quite nicely for a release."

* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
  MIPS: Function tracer: Fix broken function tracing
  mips: Move __virt_addr_valid() to a place for MIPS 64
  MIPS: Netlogic: Fix UP compilation on XLR
  MIPS: AR71xx: Fix AR71XX_PCI_MEM_SIZE
  MIPS: AR724x: Fix AR724X_PCI_MEM_SIZE
  MIPS: Lantiq: Fix cp0_perfcount_irq mapping
  MIPS: DSP: Fix DSP mask for registers.
  MIPS: Fix build failure by adding definition of pfn_pmd().
  MIPS: Octeon: Fix warning.
  MIPS: delay.c: Check BITS_PER_LONG instead of __SIZEOF_LONG__
  MIPS: PNX833x: Fix comment.
  MIPS: Add struct p_format to union mips_instruction.
  MIPS: Export <asm/break.h>.
  MIPS: BCM47xx: Enable SSB prerequisite SSB_DRIVER_PCICORE.
  MIPS: BCM47xx: Select GPIOLIB for BCMA on bcm47xx platform
  MIPS: vpe.c: Fix null pointer dereference in print arguments.

i2c_hid_output_raw_report is used by hidraw to forward set_report requests.
The current implementation of i2c_hid_set_report needs to take the
report_id as an argument. The report_id is stored in the first byte
of the buffer in argument of i2c_hid_output_raw_report.

Not removing the report_id from the given buffer adds this byte 2 times
in the command, leading to a non working command.
Reported-by: Andrew Duggan <aduggan@synaptics.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

Function tracing is currently broken for all 32 bit MIPS platforms.
When tracing is enabled, the kernel immediately hangs on boot.
This is a result of commit b732d439
that changes the kernel/trace/Kconfig file so that is no longer
forces FRAME_POINTER when FUNCTION_TRACING is enabled.

MIPS frame pointers are generally considered to be useless because
they cannot be used to unwind the stack. Unfortunately the MIPS
function tracing code has bugs that are masked by the use of frame
pointers. This commit fixes the bugs so that MIPS frame pointers
don't need to be enabled.

The bugs are a result of the odd calling sequence used to call the trace
routine. This calling sequence is inserted into every traceable function
when the tracing CONFIG option is enabled. This sequence is generated
for 32bit MIPS platforms by the compiler via the "-pg" flag.

Part of the sequence is "addiu sp,sp,-8" in the delay slot after every
call to the trace routine "_mcount" (some legacy thing where 2 arguments
used to be pushed on the stack). The _mcount routine is expected to
adjust the sp by +8 before returning.  So when not disabled, the original
jalr and addiu will be there, so _mcount has to adjust sp.

The problem is that when tracing is disabled for a function, the
"jalr _mcount" instruction is replaced with a nop, but the
"addiu sp,sp,-8" is still executed and the stack pointer is left
trashed. When frame pointers are enabled the problem is masked
because any access to the stack is done through the frame
pointer and the stack pointer is restored from the frame pointer when
the function returns.

This patch writes two nops starting at the address of the "jalr _mcount"
instruction whenever tracing is disabled. This means that the
"addiu sp,sp.-8" will be converted to a nop along with the "jalr".  When
disabled, there will be two nops.

This is SMP safe because the first time this happens is during
ftrace_init() which is before any other processor has been started.
Subsequent calls to enable/disable tracing when other CPUs ARE running
will still be safe because the enable will only change the first nop
to a "jalr" and the disable, while writing 2 nops, will only be changing
the "jalr". This patch also stops using stop_machine() to call the
tracer enable/disable routines and calls them directly because the
routines are SMP safe.

When the kernel first boots we have to be able to handle the gcc
generated jalr, addui sequence until ftrace_init gets a chance to run
and change the sequence. At this point mcount just adjusts the stack
and returns. When ftrace_init runs, we convert the jalr/addui to nops.
Then whenever tracing is enabled we convert the first nop to a "jalr
mcount+8". The mcount+8 entry point skips the stack adjust.

[ralf@linux-mips.org: Folded in  Steven Rostedt's build fix.]
Signed-off-by: Al Cooper <alcooperx@gmail.com>
Cc: rostedt@goodmis.org
Cc: ddaney.cavm@gmail.com
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/4806/
Patchwork: https://patchwork.linux-mips.org/patch/4841/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>