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Adding the ability to get a physical address from point() in addition
to virtual address. This physical address is required for XIP of
userspace code from flash.
Signed-off-by: Jared Hulbert <[email protected]>
Reviewed-by: Jörn Engel <[email protected]>
Acked-by: Nicolas Pitre <[email protected]>
Acked-by: Greg Ungerer <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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Signed-off-by: Robert P. J. Day <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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This enhances plat-ram to take a map_probes argument in
the platform_data structure which allow plat-ram to support
any direct-mapped device that MTD supports (jedec, cfi, amd ..)
A few items are also fixed:
- Don't panic if probes is 0
- Actually use the partition list that is passed in
Signed-off-by: Florian Fainelli <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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This patch adds a proper prototype for onenand_bbt_read_oob() in
include/linux/mtd/onenand.h
Signed-off-by: Adrian Bunk <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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This patch adds proper prototypes for nftl_{read,write}_oob() in
include/linux/mtd/nftl.h
Signed-off-by: Adrian Bunk <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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This patch adds proper prototypes for inftl_{read,write}_oob() in
include/linux/mtd/inftl.h
Signed-off-by: Adrian Bunk <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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MTDs are well suited for logging critical data and the mtdoops driver
allows kernel panics/oops to be written to flash in a blackbox flight
recorder fashion allowing better debugging and analysis of crashes.
Any kernel oops in user context can be easily handled since the kernel
continues as normal and any queued mtd writes are scheduled. Any kernel
oops in interrupt context results in a panic and the delayed writes will
not be scheduled however. The existing mtd->write function cannot be
called in interrupt context so these messages can never be written to
flash.
This patch adds a panic_write function pointer that drivers can
optionally implement which can be called in interrupt context. It is
only intended to be called when its known the kernel is about to panic
and we need to write to succeed. Since the kernel is not going to be
running for much longer, this function can break locks and delay to
ensure the write succeeds (but not sleep).
Signed-off-by: Richard Purdie <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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Signed-off-by: Scott Wood <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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Use the higher bits for other purpose.
Signed-off-by: Kyungmin Park <[email protected]>
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We have to be able to change individual LEBs for utilities like
ubifsck, ubifstune. For example, ubifsck has to be able to fix
errors on the media, ubifstune has to be able to change the
the superblock, hence this ioctl.
Signed-off-by: Artem Bityutskiy <[email protected]>
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According to "Common Flash Memory Interface Publication 100" dated December 1,
2001, the interface code for x16/x32 chips is 0x0005, and not 0x0004 used so
far.
Signed-off-by: Bartlomiej Sieka <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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The idea of this interface belongs to Adrian Hunter. The
interface is extremely useful when one has to have a guarantee
that an LEB will contain all 0xFFs even in case of an unclean
reboot. UBI does have an 'ubi_leb_erase()' call which may do
this, but it is stupid and ineffecient, because it flushes whole
queue. I should be re-worked to just be a pair of unmap,
map calls.
The user of the interfaci is UBIFS at the moment.
Signed-off-by: Artem Bityutskiy <[email protected]>
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This is used by axisflashmap.c to boot from ram.
Signed-off-by: Jesper Nilsson <[email protected]>
Acked-by: Mikael Starvik <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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When we press ctrl-alt-del,kernel_restart_prepare will invoke
cfi_intelext_reboot which will set flash to read array mode, but later
when device_shutdown is invoked which may put current work queue to
sleep and other process may be scheduled to running and programming
flash in not FL_READY mode again. So we can't boot up if this flash is
used for bootloader.
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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Document mtd erase interface.
Signed-off-by: Jörn Engel <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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When building NOR flash support, you have compile-time options for the
bus width and the number of individual chips which are interleaved
together onto that bus. The code to deal with arbitrary geometry is a
bit convoluted, and people want to just configure it for the specific
hardware they have, to avoid the runtime overhead.
Selecting _none_ of the available options doesn't make any sense. You
should have at least one. This makes it build though, since people
persist in trying.
Signed-off-by: David Woodhouse <[email protected]>
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This patch adds the manufacturer ID for AMD flash.
Signed-off-by: Steven J. Hill <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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The 2X Program is an extension of Program Operation.
Since the device is equipped with two DataRAMs, and two-plane NAND Flash
memory array, these two component enables simultaneous program of 4KiB.
Plane1 has only even blocks such as block0, block2, block4 while Plane2
has only odd blocks such as block1, block3, block5.
So MTD regards it as 4KiB page size and 256KiB block size
Now the following chips support it. (KFXXX16Q2M)
Demux: KFG2G16Q2M, KFH4G16Q2M, KFW8G16Q2M,
Mux: KFM2G16Q2M, KFN4G16Q2M,
And more recent chips
Signed-off-by: Kyungmin Park <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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Generalise the handling of MTD-specific superblocks so that JFFS2 and ROMFS
can both share it.
Signed-off-by: David Howells <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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Delete the allegedly obsolete "bank_size" member of struct mtd_info.
Signed-off-by: Robert P. J. Day <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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Since the header file include/linux/mtd/mtd.h is not exported to user
space, remove the user space check and error.
Signed-off-by: Robert P. J. Day <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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This patch extends nand.h in order to enable platform NAND driver.
Signed-off-by: Vitaly Wool <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Conflicts:
drivers/mtd/Kconfig
Signed-off-by: David Woodhouse <[email protected]>
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UBI (Latin: "where?") manages multiple logical volumes on a single
flash device, specifically supporting NAND flash devices. UBI provides
a flexible partitioning concept which still allows for wear-levelling
across the whole flash device.
In a sense, UBI may be compared to the Logical Volume Manager
(LVM). Whereas LVM maps logical sector numbers to physical HDD sector
numbers, UBI maps logical eraseblocks to physical eraseblocks.
More information may be found at
http://www.linux-mtd.infradead.org/doc/ubi.html
Partitioning/Re-partitioning
An UBI volume occupies a certain number of erase blocks. This is
limited by a configured maximum volume size, which could also be
viewed as the partition size. Each individual UBI volume's size can
be changed independently of the other UBI volumes, provided that the
sum of all volume sizes doesn't exceed a certain limit.
UBI supports dynamic volumes and static volumes. Static volumes are
read-only and their contents are protected by CRC check sums.
Bad eraseblocks handling
UBI transparently handles bad eraseblocks. When a physical
eraseblock becomes bad, it is substituted by a good physical
eraseblock, and the user does not even notice this.
Scrubbing
On a NAND flash bit flips can occur on any write operation,
sometimes also on read. If bit flips persist on the device, at first
they can still be corrected by ECC, but once they accumulate,
correction will become impossible. Thus it is best to actively scrub
the affected eraseblock, by first copying it to a free eraseblock
and then erasing the original. The UBI layer performs this type of
scrubbing under the covers, transparently to the UBI volume users.
Erase Counts
UBI maintains an erase count header per eraseblock. This frees
higher-level layers (like file systems) from doing this and allows
for centralized erase count management instead. The erase counts are
used by the wear-levelling algorithm in the UBI layer. The algorithm
itself is exchangeable.
Booting from NAND
For booting directly from NAND flash the hardware must at least be
capable of fetching and executing a small portion of the NAND
flash. Some NAND flash controllers have this kind of support. They
usually limit the window to a few kilobytes in erase block 0. This
"initial program loader" (IPL) must then contain sufficient logic to
load and execute the next boot phase.
Due to bad eraseblocks, which may be randomly scattered over the
flash device, it is problematic to store the "secondary program
loader" (SPL) statically. Also, due to bit-flips it may become
corrupted over time. UBI allows to solve this problem gracefully by
storing the SPL in a small static UBI volume.
UBI volumes vs. static partitions
UBI volumes are still very similar to static MTD partitions:
* both consist of eraseblocks (logical eraseblocks in case of UBI
volumes, and physical eraseblocks in case of static partitions;
* both support three basic operations - read, write, erase.
But UBI volumes have the following advantages over traditional
static MTD partitions:
* there are no eraseblock wear-leveling constraints in case of UBI
volumes, so the user should not care about this;
* there are no bit-flips and bad eraseblocks in case of UBI volumes.
So, UBI volumes may be considered as flash devices with relaxed
restrictions.
Where can it be found?
Documentation, kernel code and applications can be found in the MTD
gits.
What are the applications for?
The applications help to create binary flash images for two purposes: pfi
files (partial flash images) for in-system update of UBI volumes, and plain
binary images, with or without OOB data in case of NAND, for a manufacturing
step. Furthermore some tools are/and will be created that allow flash content
analysis after a system has crashed..
Who did UBI?
The original ideas, where UBI is based on, were developed by Andreas
Arnez, Frank Haverkamp and Thomas Gleixner. Josh W. Boyer and some others
were involved too. The implementation of the kernel layer was done by Artem
B. Bityutskiy. The user-space applications and tools were written by Oliver
Lohmann with contributions from Frank Haverkamp, Andreas Arnez, and Artem.
Joern Engel contributed a patch which modifies JFFS2 so that it can be run on
a UBI volume. Thomas Gleixner did modifications to the NAND layer. Alexander
Schmidt made some testing work as well as core functionality improvements.
Signed-off-by: Artem B. Bityutskiy <[email protected]>
Signed-off-by: Frank Haverkamp <[email protected]>
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Add Micron Manufacturer ID.
Signed-off-by: Shahrom Sharif <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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Auto unlock sectors on resume for auto locking flash on power up.
Signed-off-by: Rodolfo Giometti <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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Delete the unreferenced header file include/linux/mtd/iflash.h.
Signed-off-by: Robert P. J. Day <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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Classify the page data and oob buffer
and it prevents the memory fragementation (writesize + oobsize)
Signed-off-by: Kyungmin Park <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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During the MTD rework the oobavail parameter of mtd_info structure has become
private. This is not quite correct in terms of integrity and logic. If we have
means to write to OOB area, then we'd like to know upfront how many bytes out
of OOB are spare per page to be able to adapt to specific cases.
The patch inlined adds the public oobavail parameter.
Signed-off-by: Vitaly Wool <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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Add more comment to OOB I/O interface. Read/write are not
symmetric which is confusing and should be documented.
Signed-off-by: Artem Bityutskiy <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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Remove unused and broken mtd->ecctype and mtd->eccsize fields
from struct mtd_info. Do not remove them from userspace API
data structures (don't want to breake userspace) but mark them
as obsolete by a comment. Any userspace program which uses them
should be half-broken anyway, so this is more about saving
data structure size.
Signed-off-by: Artem Bityutskiy <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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Remove ugly and weird MTD_PROGREGION_CTRLMODE_VALID() and
MTD_PROGREGION_CTRLMODE_INVALID() macros. There is only one
user of them and they are used locally just for printing.
Anyway, this patch is a preparation for removing mtd->ecctype
and mtd->eccsize, but these macros use them. Fix this.
Signed-off-by: Artem Bityutskiy <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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This patch adds support for 64 bit resources enabled via the
CONFIG_RESOURCES_64BIT option. Now a 64 bit can be passed to the
physmap driver.
Signed-off-by: Stefan Roese <[email protected]>
Signed-off-by: Lennert Buytenhek <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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Replace the inclusion of linux/mtd/map.h with a forward-declaration
of struct map_info. This allows linux/mtd/physmap.h to be included by
e.g. board code even if the MTD subsystem is disabled.
Signed-off-by: Haavard Skinnemoen <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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Fixes kernel-doc warning in mtd/nand.h.
Signed-off-by: Randy Dunlap <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
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Provide the bad block scan with its own read function so that important error
messages that are not from the the bad block scan, can always be printed.
Signed-off-by: Adrian Hunter <[email protected]>
Signed-off-by: Kyungmin Park <[email protected]>
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It use blockpage instead of a pair (block, page). It can also cover a small chunk access. 0x00, 0x20, 0x40 and so on.
And in JFFS2 behavior, sometimes it reads two pages alternatively.
e.g., It first reads A page, B page and A page.
So we check another bufferram to find requested page.
Signed-off-by: Kyungmin Park <[email protected]>
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- Remove unused fields
- Fix typo
Signed-off-by: Kyungmin Park <[email protected]>
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Update copyrights and code cleanup
Signed-off-by: Kyungmin Park <[email protected]>
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- DDP code clean-up
- Reduce block & bufferram operations in DDP
Signed-off-by: Kyungmin Park <[email protected]>
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Read-while-load enables higher performance read operations.
Signed-off-by: Adrian Hunter <[email protected]>
Signed-off-by: Kyungmin Park <[email protected]>
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OneNAND supports up to 4 writes at one NAND page. Add support of this feature.
Signed-off-by: Kyungmin Park <[email protected]>
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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
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This patch adds get_device() and put_device() methods to the MTD description
structure (struct mtd_info). These methods are called by MTD whenever the MTD
device is get or put. They are needed when the underlying driver is something
smarter then just flash chip driver, for example UBI.
Signed-off-by: Artem Bityutskiy <[email protected]>
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This patch adds one more function to the MTD interface to make it possible to
open MTD devices by their names, not only numbers. This is very handy in many
situations. Also, MTD device number depend on load order and may vary, while
names are fixed.
Signed-off-by: Artem Bityutskiy <[email protected]>
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Many SLC NANDs support up to 4 writes at one NAND page. Add support
of this feature.
Signed-off-by: Artem Bityutskiy <[email protected]>
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Signed-off-by: Artem Bityutskiy <[email protected]>
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