Follow-on patch to the previous driver model patch for the MTD
framework.  This one makes various MTD drivers connect to the
driver model tree, so /sys/devices/virtual/mtd/* nodes are no
longer present ... mostly drivers used on boards I have handy.

Based on a patch from Kay Sievers.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

1) Add more sysfs attributes: flags, size, erasesize, writesize,
   oobsize, numeraseregions, name

2) Move core_initcall() code into init_mtd().  The original approach
   does not work if CONFIG_MTD=m .

3) Add device_unregister() in del_mtd_device() so that devices get
   removed from sysfs as each driver is unloaded.
Signed-off-by: NKevin Cernekee <kpc.mtd@gmail.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Update driver model support in the MTD framework, so it fits
better into the current udev-based hotplug framework:

 - Each mtd_info now has a device node.  MTD drivers should set
   the dev.parent field to point to the physical device, before
   setting up partitions or otherwise declaring MTDs.

 - Those device nodes always map to /sys/class/mtdX device nodes,
   which no longer depend on MTD_CHARDEV.

 - Those mtdX sysfs nodes have a "starter set" of attributes;
   it's not yet sufficient to replace /proc/mtd.

 - Enabling MTD_CHARDEV provides /sys/class/mtdXro/ nodes and the
   /sys/class/mtd*/dev attributes (for udev, mdev, etc).

 - Include a MODULE_ALIAS_CHARDEV_MAJOR macro.  It'll work with
   udev creating the /dev/mtd* nodes, not just a static rootfs.

So the sysfs structure is pretty much what you'd expect, except
that readonly chardev nodes are a bit quirky.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

A pointer to plat_nand_probe is passed to the core via
platform_driver_register and so the function must not disappear when the
.init sections are discarded.  Otherwise (if also having HOTPLUG=y)
unbinding and binding a device to the driver via sysfs will result in an
oops as does a device being registered late.

An alternative to this patch is using platform_driver_probe instead of
platform_driver_register plus removing the pointer to the probe function
from the struct platform_driver.
Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Hamish Moffatt <hamish@cloud.net.au>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Vitaly Wool <vitalywool@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

A pointer to sa1100_mtd_probe is passed to the core via
platform_driver_register and so the function must not disappear when the
.init sections are discarded.  Otherwise (if also having HOTPLUG=y)
unbinding and binding a device to the driver via sysfs will result in an
oops as does a device being registered late.

An alternative to this patch is using platform_driver_probe instead of
platform_driver_register plus removing the pointer to the probe function
from the struct platform_driver.
Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: Nicolas Pitre <nico@marvell.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Reported-by: NDan Carpenter <error27@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: NMarcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Now as all PXA Zaurii are converted to use the physmap map,
drop the sharpsl-flash map completely.
Signed-off-by: NDmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

SLOF has a further node which could not be evaluated
by the current routine. The current routine returns
because the node hasn't the required reg property. As
fix this patch adds a check to determine the partition
child nodes. If the node is not a partition the number
of total partitions will be decreased and loop continues
with the next nodes.
Signed-off-by: NBenjamin Krill <ben@codiert.org>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Signed-off-by: NJeremy Baker <Jeremy.Baker@renesas.com>
Signed-off-by: NYoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Add support for direct mapping through mtdconcat, if possible, by attaching the
samebacking_dev_info structure to the master.

It has some restrictions:

 (1) It won't permit direct mapping of concatenated devices that have differing
     BDIs.

 (2) It doesn't support maps that span the 'gap' between devices, although it
     possibly could if the devices spanned across return compatible
     (ie. contiguous) addresses from their get_unmapped_area() ops.
Signed-off-by: NGavin Lambert <gavinl@compacsort.com>
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Tested-by: NBernd Schmidt <bernd.schmidt@analog.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Present backing device capabilities for MTD character device files to allow
NOMMU mmap to do direct mapping where possible.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Tested-by: NBernd Schmidt <bernd.schmidt@analog.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

OneNAND write-while-program method of writing improves performance,
compared with ordinary writes, by transferring data to OneNAND's
RAM buffers atthe same time as programming the NAND core.

When writing several NAND pages at a time, an improvement of
12% to 25% is seen.
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: NAdrian Hunter <adrian.hunter@nokia.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

panic_write may read in an interrupt context.
Signed-off-by: NAdrian Hunter <adrian.hunter@nokia.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Currently redboot and afx parser return allocated mtd_partition array
and cmdlinepart and ar7 return persistent array.

This patch make cmdlinepart and ar7 also return allocated array, so
that all users can free it regardless of parser type.
Signed-off-by: NAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NYegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

- do not leave spin lock locked
- initialise spin lock
Signed-off-by: NAdrian Hunter <adrian.hunter@nokia.com>
Acked-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

MTD's have both an index number and a name.  Formerly,
the MTD selected for mtdoops was done only by index
number.  With this patch, a name can be used instead.

For example, the kernel command line:

	console=ttyMTD5

selects MTD 5 for mtdoops.  But now this is also possible:

	console=ttyMTD,log

which selects the MTD named "log" for mtdoops.

This has the advantage that partitions can be added or
removed that would affect the MTD index number but not the
name, without having to then change the kernel command line.
Signed-off-by: NAdrian Hunter <ext-adrian.hunter@nokia.com>
Acked-by: NRichard Purdie <rpurdie@linux.intel.com>
Acked-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Signed-off-by: NMike Rapoport <mike@compulab.co.il>
Acked-by: NEric Miao <eric.miao@marvell.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Signed-off-by: NMike Rapoport <mike@compulab.co.il>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Signed-off-by: NMike Rapoport <mike@compulab.co.il>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

The nftl module is missing the block-major-93-* alias that would cause
it to be auto-loaded when a nftl of that type is opened.  This patch
adds the alias.
Signed-off-by: NScott James Remnant <scott@canonical.com>
Signed-off-by: NTim Gardner <tim.gardner@canonical.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

The mtdchar module is missing the char-major-90-* alias that would cause
it to be auto-loaded when a device of that type is opened.  This patch
adds the alia..
Signed-off-by: NScott James Remnant <scott@canonical.com>
Signed-off-by: NTim Gardner <tim.gardner@canonical.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

If the inval_cache_and_wait_for_operation() is re-entered by write operation when erase
operation is in progress, the chip->erase_suspended will be cleared, this cause the erase
timeo is not reset and will result time out error for erase.
Signed-off-by: NGraff Yang <graff.yang@gmail.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

This is a map driver for NOR flash chips on RBTX4939 board.
Signed-off-by: NAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Ralf Bächle <ralf@linux-mips.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

This patch adds support for the integrated NAND flash controller of the
TXx9 family.

Once upon a time there were tx4925ndfmc and tx4938ndfmc driver.  They
were removed due to bitrot in 2005.
This new driver is completely rewritten based on a driver in CELF patch
archive.
Signed-off-by: NAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Ralf Bächle <ralf@linux-mips.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Move mtd_has_partitions() and mtd_has_cmdlinepart() inlines from a
DaVinci-specific driver to the <linux/mtd/partitions.h> header.

Use those to eliminate #ifdefs in two drivers which had their own
definitions of mtd_has_partitions().

Quite a lot of other MTD drivers could benefit from using use one or both
of these to remove #ifdeffery.  Maybe some Janitors would like to help.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Remove <linux/miscdevice.h> from various drivers which don't actually use
any of its contents.  There are still a number of these left in
arch-specific bits of the tree.

(Found by diffing results of "grep -rl" for linux/miscdevice.h and for
misc_register, examining the differences, and verifying removals with a
build test.)
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Usage of davinci-specific cpu_is macros is not allowed in drivers.
These options should be passed in through platform_data.
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Fix incorrect debug messages (*write* not read); someone committed some
cut'n'paste bugs.   There might be more, I only noticed these since I was
looking for nand_read usage and landed in some very wrong functions.

IMO all MTD debugging message framework is goofed, anyway.  It uses
"DEBUG" in a way that's incompatible with usage most everywhere else in
the kernel, and which prevents normal pr_dbg() and dev_dbg() calls from
working right.

[True. It predates those by a long way, and should probably be updated 
to use them. dwmw2]
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

This is a device driver for the NAND flash controller found on the various
DaVinci family chips.  It handles up to four SoC chipselects, and some
flavors of secondary chipselect (e.g.  based on upper bits of the address
bus) as used with some multichip packages.  (Including the 2 GiB chips
used on some TI devel boards.)

The 1-bit ECC hardware is supported (3 bytes ECC per 512 bytes data); but
not yet the newer 4-bit ECC (10 bytes ECC per 512 bytes data), as
available on chips like the DM355 or OMAP-L137 and needed with the more
error-prone MLC NAND chips.

This is a cleaned-up version of code that's been in use for several years
now; sanity checked with the new drivers/mtd/tests.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NSudhakar Rajashekhara <sudhakar.raj@ti.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

The syndrome based page read/write routines store ECC, and possibly other
"OOB" data, right after each chunk of ECC'd data.  With ECC chunk size of
512 bytes and a large page (2KiB) NAND, the layout is:

  data-0 OOB-0 data-1 OOB-1 data-2 OOB-2 data-3 OOB-3 OOB-leftover

Where OOBx is (prepad, ECC, postpad).  However, the current "raw" routines
use a traditional layout -- data OOB, disregarding the prepad and postpad
values -- so when they're used with that type of ECC hardware, those calls
mix up the data and OOB.  Which means, in particular, that bad block
tables won't be found on startup, with data corruption and related chaos
ensuing.

The current syndrome-based drivers in mainline all seem to use one chunk
per page; presumably they haven't noticed such bugs.

Fix this, by adding read/write page_raw_syndrome() routines as siblings of
the existing non-raw routines; "raw" just means to bypass the ECC
computations, not change data and OOB layout.
Signed-off-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Signed-off-by: NMike Frysinger <vapier.adi@gmail.com>
Signed-off-by: NBryan Wu <cooloney@kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

The bf5xx_nand_add_partition() func is only called by __devinit functions,
so put it into the __devinit section as well
Signed-off-by: NMike Frysinger <vapier.adi@gmail.com>
Signed-off-by: NBryan Wu <cooloney@kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Only set DMAC1_PERIMUX once we have requested and been granted the dma
channel to prevent breaking other peripherals in the error case
Signed-off-by: NMike Frysinger <vapier.adi@gmail.com>
Signed-off-by: NBryan Wu <cooloney@kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Convert the PS3 Video RAM Storage Driver from an MTD driver to a plain block
device driver.

The ps3vram driver exposes unused video RAM on the PS3 as a block device
suitable for storage or swap.  Fast data transfer is achieved using a local
cache in system RAM and DMA transfers via the GPU.

The new driver is ca. 50% faster for reading, and ca. 10% for writing.
Signed-off-by: NGeert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Acked-by: NGeoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

commit e480814f ("[MTD] [MAPS] physmap:
fix wrong free and del_mtd_{partition,device}") introduces a NULL pointer
dereference in physmap_flash_remove when called from the error path in
physmap_flash_probe (if map_probe failed).

Call del_mtd_{partition,device} only if info->cmtd was not NULL.
Reported-by: NpHilipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: NAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Commit 771999b6 ("[MTD] DataFlash: bugfix,
binary page sizes now handled") broke support for probing AT45DB321C flash
chips.  These chips do not support the "page size" status bit, so if we
match the JEDEC id return early.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: NWill Newton <will.newton@gmail.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Acked-by: NDavid Brownell <dbrownell@users.sourceforge.net>
Cc: <stable@kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

`iop_adma_remove' referenced in section `.data' of drivers/built-in.o: defined in discarded section `.devexit.text' of drivers/built-in.o
`mv_xor_remove' referenced in section `.data' of drivers/built-in.o: defined in discarded section `.devexit.text' of drivers/built-in.o
`mv64xxx_i2c_unmap_regs' referenced in section `.devinit.text' of drivers/built-in.o: defined in discarded section `.devexit.text' of drivers/built-in.o
`mv64xxx_i2c_remove' referenced in section `.data' of drivers/built-in.o: defined in discarded section `.devexit.text' of drivers/built-in.o
`orion_nand_remove' referenced in section `.data' of drivers/built-in.o: defined in discarded section `.devexit.text' of drivers/built-in.o
`pxafb_remove' referenced in section `.data' of drivers/built-in.o: defined in discarded section `.devexit.text' of drivers/built-in.o
Acked-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

We really don't want the BIOS flash mapping hacks to get automatically
loaded.

No idea why it isn't using pci_register_driver() though -- that should
be fine... and is even _present_ but disabled by #if 0.
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Add support for inverted rdy_busy pin for Atmel nand device controller
It will fix building error on NeoCore926 board.
Acked-by: NAndrew Victor <linux@maxim.org.za>
Acked-by: NDavid Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: NGregory CLEMENT <gclement@adeneo.adetelgroup.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>