linux-toradex.git/include/linux/mtd/mtd.h, branch v2.6.38.5

mtd: add writebufsize field to mtd_info struct

2011-01-06T15:35:50+00:00

This field will be used to indicate the write buffer size
of the MTD device. UBI will set it's minimal I/O unit size
(min_io_size) to the indicated write buffer size. By this
change we intend to fix failed recovery of UBIFS partitions
we currently observe on NOR flash when mounting the partition
after unclean unmount.

Currently the min_io_size is set to mtd->writesize (which is 1
byte for NOR flash). But flash programming is often done from
prepared write buffer containing multiple bytes and is performed
in one programming operation which could be interrupted by a power
cut or a system reset causing corrupted (partially written) areas
in a flash sector. Knowing the size of potentially corrupted areas
UBIFS scanning and recovery algorithms are able to perform
successful recovery.

In case of NOR flash minimal I/O size must be equal to the
maximal size of the write buffer used by embedded flash
programming algorithm. In case of NAND flash mtd->writebufsize
should be equivalent to mtd->writesize.

The subsequent patches will add mtd->writebufsize initialization
where needed.

Signed-off-by: Anatolij Gustschin 
Signed-off-by: Artem Bityutskiy 
Signed-off-by: David Woodhouse

mtd: edit comments on deprecation of ioctl ECCGETLAYOUT

2010-10-24T22:37:27+00:00

There were some improvements and additions necessary in the
comments explaining of the expansion of nand_ecclayout, the
introduction of nand_ecclayout_user, and the deprecation of the
ioctl ECCGETLAYOUT.

Also, I found a better placement for the macro MTD_MAX_ECCPOS_ENTRIES;
next to the definition of MTD_MAX_OOBFREE_ENTRIES in mtd-abi.h. The macro
is really only important for the ioctl code (found in drivers/mtd/mtdchar.c)
but since there are small edits being made to the user-space header, I
figured this is a better location.

Signed-off-by: Brian Norris 
Signed-off-by: Artem Bityutskiy 
Signed-off-by: David Woodhouse

mtd: nand: expand nand_ecc_layout, deprecate ioctl ECCGETLAYOUT

2010-10-24T22:37:24+00:00

struct nand_ecclayout is too small for many new chips; OOB regions can be as
large as 448 bytes and may increase more in the future. Thus, copying that
struct to user-space with the ECCGETLAYOUT ioctl is not a good idea; the ioctl
would have to be updated every time there's a change to the current largest
size.

Instead, the old nand_ecclayout is renamed to nand_ecclayout_user and a
new struct nand_ecclayout is created that can accomodate larger sizes and
expand without affecting the user-space. struct nand_ecclayout can still
be used in board drivers without modification -- at least for now.

A new function is provided to convert from the new to the old in order to
allow the deprecated ioctl to continue to work with truncated data. Perhaps
the ioctl, the conversion process, and the struct nand_ecclayout_user can be
removed altogether in the future.

Note: There are comments in nand/davinci_nand.c::nand_davinci_probe()
regarding this issue; this driver (and maybe others) can be updated to
account for extra space. All kernel drivers can use the expanded
nand_ecclayout as a drop-in replacement and ignore its benefits.

Signed-off-by: Brian Norris 
Signed-off-by: Artem Bityutskiy 
Signed-off-by: David Woodhouse

mtd: Remove obsolete include

2010-08-08T20:19:42+00:00

Signed-off-by: David Woodhouse

mtd: Update copyright notices

2010-08-08T19:58:20+00:00

Signed-off-by: David Woodhouse

mtd: add an ioctl to query the lock status of a flash sector

2010-08-02T08:03:41+00:00

This patchs adds a way for user space programs to find out whether a
flash sector is locked. An optional driver method in the mtd_info struct
provides the information.

Signed-off-by: Richard Cochran 
Signed-off-by: Artem Bityutskiy 
Signed-off-by: David Woodhouse

mtd: nand: make reads using MTD_OOB_RAW affect only ECC validation

2010-02-26T18:00:08+00:00

This changes the behavier of MTD_OOB_RAW. It used to read both OOB and 
data to the data buffer, however you would still need to specify the 
dummy oob buffer.

This is only used in one place, but makes it hard to read data+oob 
without ECC test, thus I removed that behavier, and fixed the user.

Now MTD_OOB_RAW behaves just like MTD_OOB_PLACE, but doesn't do ECC 
validation

Signed-off-by: Maxim Levitsky 
Signed-off-by: David Woodhouse

mtd: create unlocked versions of {get,put}_mtd_device

2010-02-26T17:03:15+00:00

Use these only if you know that you already hold mtd_table_mutex

Signed-off-by: Maxim Levitsky 
Signed-off-by: David Woodhouse

mtd: Replace static array of devices with an idr structure

2010-02-25T11:55:14+00:00

Signed-off-by: Ben Hutchings 
Signed-off-by: Artem Bityutskiy 
Signed-off-by: David Woodhouse

mtd: fix the conversion from dev to mtd_info

2009-08-03T13:16:01+00:00

The patch fixes a bug when converting dev to mtd_info by using the
drvdata of the dev, the previous code used
container_of(dev, struct mtd_info, dev), but won't work for the mtdXro
devices as they created without being contained inside mtd_info structure.

Signed-off-by: Saeed Bishara 
Signed-off-by: David Woodhouse