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: NStefan Roese <sr@denx.de>
Tested-by: NHolger Brunck <holger.brunck@keymile.com>
Signed-off-by: NArtem Bityutskiy <artem.bityutskiy@linux.intel.com>

When working on a problem with some flash chips that lock up during
write-buffer operations, I think there may be a bug in the linux
handling of chips using cfi_cmdset_0002.c.

The datasheets I have found for a number of these chips all specify that
when aborting a write-buffer command, it is not enough to use the
standard reset.  Rather a "write-to-buffer-reset command" is needed.
This command is quite similar for all chips, the main variance seem to
be if the final 0xF0 can go to any address or must go to addr_unlock1.

The bug is then in the recovery handling when timing out at the end of
do_write_buffer, where using the normal reset command is not sufficient.

Without this change, if the write-buffer command fails then any
following operations on the flash also fail.
Signed-off-by: NHarald Nordgard-Hansen <hhansen@pvv.org>
Signed-off-by: NArtem Bityutskiy <artem.bityutskiy@linux.intel.com>

Fix the following issues with Micron's (formerly Numonyx)
M29EW NOR flash chips, as documented on TN-13-07:
- Correcting Erase Suspend Hang Ups (page 20)
- Resolving the Delay After Resume Issue (page 22)
Signed-off-by: NGerlando Falauto <gerlando.falauto@keymile.com>
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@linux.intel.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

These should be semicolons, not commas.
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Spansion S29NS512P flash uses a 16bit transfer to report number
of sectors instead of two 8bit accesses as CFI specifies.

Artem: remove warning message which said that we are applying the
fixup - no need to scary the user unnecessarily.
Signed-off-by: NJavier Martin <javier.martin@vista-silicon.com>
Signed-off-by: NArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

This patch is part of a set which fixes unnecessary flash erase and write errors
resulting from the MTD CFI driver turning off vpp while an erase is in progress.
This patch ensures that only those flash operations which call ENABLE_VPP() can
then call DISABLE_VPP(). Other operations should never call DISABLE_VPP().
Signed-off-by: NPaul Parsons <lost.distance@yahoo.com>
Signed-off-by: NArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

In many places in drivers we verify for the zero length, but this is very
inconsistent across drivers. This is obviously the right thing to do, though.
This patch moves the check to the MTD API functions instead and removes a lot
of duplication.
Signed-off-by: NArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
Reviewed-by: NShmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

The MTD API function now zero the 'retlen' parameter before calling
the driver's method — do not do this again in drivers. This removes
duplicated '*retlen = 0' assignent from the following methods:

    'mtd_point()'
    'mtd_read()'
    'mtd_write()'
    'mtd_writev()'
    'mtd_panic_write()'
Signed-off-by: NArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

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

This allows the mtdoops driver to work on flash chips using the
AMD/Fujitsu compatible command set.

As the code comments note, the locks used throughout the normal code
paths in the driver are ignored, so that the chance of writing out the
kernel's last messages are maximized.
Signed-off-by: NIra W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@linux.intel.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Signed-off-by: NBrian Norris <computersforpeace@gmail.com>
Signed-off-by: NArtem Bityutskiy <artem.bityutskiy@intel.com>

Start moving away from the MTD_DEBUG_LEVEL messages. The dynamic
debugging feature is a generic kernel feature that provides more
flexibility.

(See Documentation/dynamic-debug-howto.txt)

Also fix some punctuation, indentation, and capitalization that went
along with the affected lines.
Signed-off-by: NBrian Norris <computersforpeace@gmail.com>
Signed-off-by: NArtem Bityutskiy <artem.bityutskiy@intel.com>

This is a trivial patch which removes unnecessary assignment of chip->state
in put_chip(). It's duplicated.
Signed-off-by: NTadashi Abe <tabe@mvista.com>
Acked-by: NJoakim Tjernlund <joakim.tjernlund@transmode.se>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

cfi erase command hangs up when erase and read contention occurs.
If read runs at the same address as erase operation, read issues
Erase-Suspend via get_chip() and the erase goes into sleep in wait queue.
But in this case, read operation exits by time-out without waking it up.

I think the other variants (0001, 0020 and lpddr) have the same problem too.
Tested and verified the patch only on CFI-0002 flash, though.
Signed-off-by: NTadashi Abe <tabe@mvista.com>
Acked-by: NJoakim Tjernlund <joakim.tjernlund@transmode.se>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

This patch adds CFI 1.5 support for the new Spansion S29GL-S device family.
For details, see the data sheet on the Spansion web site:
http://www.spansion.com/Support/Datasheets/S29GL_128S_01GS_00_02_e.pdfSigned-off-by: NGernot Hoyler <Gernot.Hoyler@spansion.com>
Acked-by: NGuillaume LECERF <glecerf@gmail.com>
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Fixes generated by 'codespell' and manually reviewed.
Signed-off-by: NLucas De Marchi <lucas.demarchi@profusion.mobi>

Signed-off-by: NSteffen Sledz <sledz@dresearch.de>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

When initializing mtd->writebufsize, we must take into account
possible flash chip interleaving. Wrong writebufsize initialization
caused UBIFS recovery issues resulting in unmountable UBIFS file
system on NOR flash partitions.
Signed-off-by: NAnatolij Gustschin <agust@denx.de>
Acked-by: NGuillaume LECERF <glecerf@gmail.com>
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Initialize mtd->writebufsize to the value obtained
by CFI query command at probe time.
Signed-off-by: NAnatolij Gustschin <agust@denx.de>
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

These chips report CFI v3.3 [1], so patch them on the fly to the more
correct v1.3.
Discussed and tested by the OpenWRT people [2].

[1] http://www.samsung.com/global/system/business/semiconductor/product/2007/6/11/NORFlash/32Mbit/K8D3216UBC/ds_K8D3x16UxC_rev17.pdf
[2] https://dev.openwrt.org/ticket/866Signed-off-by: NGuillaume LECERF <glecerf@gmail.com>
Acked-by: NWolfram Sang <w.sang@pengutronix.de>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

These chips report CFI v0.0 [1], so extend cfi_fixup_major_minor()
to patch all Samsung chips from 0.0 to 1.0.
Discussed and tested by the OpenWRT people [2].

[1] http://www.samsung.com/global/system/business/semiconductor/product/2007/6/11/NORFlash/64Mbit/K8D6316UTM/ds_K8D6x16UxM_rev16.pdf
[2] https://dev.openwrt.org/ticket/7348Signed-off-by: NGuillaume LECERF <glecerf@gmail.com>
Acked-by: NWolfram Sang <w.sang@pengutronix.de>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

The 'param' parameter has never been used since its introduction, so
simply remove it.
Signed-off-by: NGuillaume LECERF <glecerf@gmail.com>
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Some old SST chips use 0x50 as sector erase command, instead
of 0x30. Make this value variable to handle such chips.
Signed-off-by: NGuillaume LECERF <glecerf@gmail.com>
Acked-by: NWolfram Sang <w.sang@pengutronix.de>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Add support for SST38VF640x chips in CFI mode.
Signed-off-by: NGuillaume LECERF <glecerf@gmail.com>
Signed-off-by: Nyidong zhang <zhangyd6@gmail.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

- remove disabled code (hasn't been touched since the beginning of git
  and should be reimplemented if really needed)
- convert remaining c++-comments to plain c-style
Signed-off-by: NWolfram Sang <w.sang@pengutronix.de>
Acked-by: NGuillaume LECERF <glecerf@gmail.com>
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

The patch below updates broken web addresses in the kernel
Signed-off-by: NJustin P. Mattock <justinmattock@gmail.com>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Finn Thain <fthain@telegraphics.com.au>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Dimitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Mike Frysinger <vapier.adi@gmail.com>
Acked-by: NBen Pfaff <blp@cs.stanford.edu>
Acked-by: NHans J. Koch <hjk@linutronix.de>
Reviewed-by: NFinn Thain <fthain@telegraphics.com.au>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

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

The Spansion S29WS-P device family uses CFI version 1.4 [1].
Consider it as a valid version.

[1] http://www.spansion.com/Support/Datasheets/s29ws-p_00_a12_e.pdfSigned-off-by: NGuillaume LECERF <glecerf@gmail.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Valid primary extension versions are: 1.0, 1.1, 1.2, 1.3 [1][2].
Fix the check in cfi_cmdset_0002 accordingly.

[1] http://www.amd.com/us-en/assets/content_type/DownloadableAssets/cfi_r20.pdf, page 19
[2] http://www.amd.com/us-en/assets/content_type/DownloadableAssets/cfi_100_20011201.pdfSigned-off-by: NFlorian Fainelli <florian@openwrt.org>
Signed-off-by: NGuillaume LECERF <glecerf@gmail.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Tested with W19L320SBT9C [1].

[1] http://www.datasheetarchive.com/pdf-datasheets/Datasheets-40/DSA-795343.pdf

[dwmw2: Fix MODULE_ALIAS and linkage]
Signed-off-by: NObinou <obconseil@gmail.com>
Signed-off-by: NGuillaume LECERF <glecerf@gmail.com>
Acked-by: NFlorian Fainelli <florian@openwrt.org>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Signed-off-by: NGuillaume LECERF <glecerf@gmail.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Doh. Pointed out by Guillaume LECERF <glecerf@gmail.com> since I managed
to miss it in my test builds. S'what I get for hacking at 2am, I suppose.
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

This patch adds support for detecting SST 39VF32xxB and 39VF64xxB
chips in CFI mode.
Signed-off-by: NGuillaume LECERF <glecerf@gmail.com>
Reviewed-by: NWolfram Sang <w.sang@pengutronix.de>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

SST 39VF{16,32}xx chips use the 0x0701 command set, fully compatible
with the AMD one. This patch adds support for detecting them in CFI
mode.
Signed-off-by: NGuillaume LECERF <glecerf@gmail.com>
Reviewed-by: NWolfram Sang <w.sang@pengutronix.de>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Accept values of 2-5 for TopBottom, where the newly-added 4 and 5 values
mean a uniform layout. It does indicate WP layout but we don't handle that.

Also don't say "broken" when swapping erase regions in a top-boot chip.
That got retrospectively documented in the spec.
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

After looking at AMD's CFI specification [1], both of the extended query
tables are optional. Thus, it looks like relying that at least one of
those tables exist is a bug in cfi_cmdset_0002.

This patch inverts the logic and checks for unlock function pointers before
exiting on error. This approach leaves place to add a call to a fixup
function to try to handle chips compatible with the early AMD specification
from 1995 [2].

[1] http://www.amd.com/us-en/assets/content_type/DownloadableAssets/cfi_r20.pdf
[2] http://noel.feld.cvut.cz/hw/amd/20158a.pdfSigned-off-by: NGuillaume LECERF <glecerf@gmail.com>
Reviewed-by: NWolfram Sang <w.sang@pengutronix.de>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Ensure that the flash device is in a quiescent state before rebooting.
The implementation is closely modeled after the cfi_cmdset_0001 reboot
notifier, commit 963a6fb0 .
Signed-off-by: NKevin Cernekee <cernekee@gmail.com>
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

The use of a memcpy() during a spinlock operation will cause very long
thread context switch delays if the flash chip bandwidth is low and the
data to be copied large, because a spinlock will disable preemption.

For example: A flash with 6,5 MB/s bandwidth will cause under ubifs,
which request sometimes 128 KiB (the flash erase size), a preemption delay of
20 milliseconds. High priority threads will not be served during this
time, regardless whether this threads access the flash or not. This behavior
breaks real time.

The patch changes all the use of spin_lock operations for xxxx->mutex
into mutex operations, which is exact what the name says and means.

I have checked the code of the drivers and there is no use of atomic
pathes like interrupt or timers. The mtdoops facility will also not be used
by this drivers. So it is dave to replace the spin_lock against mutex.

There is no performance regression since the mutex is normally not
acquired.

Changelog:
 06.03.2010 First release
 26.03.2010 Fix mutex[1] issue and tested it for compile failure
Signed-off-by: NStefani Seibold <stefani@seibold.net>
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Move MANUFACTURER_MACRONIX and MANUFACTURER_SST definitions to the
include/linux/mtd/cfi.h header file and rename them to CFI_MFR_MACRONIX and
CFI_MFR_SST.

All references in drivers/mtd/chips/cfi_cmdset_0002.c are updated to reflect
this.
Signed-off-by: NGuillaume LECERF <glecerf@gmail.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

In cfi_intelext_setup and cfi_amdstd_setup, mtd is never NULL.
Remove unnecessary checks.
Signed-off-by: NJiri Slaby <jslaby@suse.cz>
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>