Commit graph

33 commits

Author SHA1 Message Date
Brian Norris
1fbb938dff mtd: nand: add 'oob_required' argument to NAND {read,write}_page interfaces
New NAND controllers can perform read/write via HW engines which don't expose
OOB data in their DMA mode. To reflect this, we should rework the nand_chip /
nand_ecc_ctrl interfaces that assume that drivers will always read/write OOB
data in the nand_chip.oob_poi buffer. A better interface includes a boolean
argument that explicitly tells the callee when OOB data is requested by the
calling layer (for reading/writing to/from nand_chip.oob_poi).

This patch adds the 'oob_required' parameter to each relevant {read,write}_page
interface; all 'oob_required' parameters are left unused for now. The next
patch will set the parameter properly in the nand_base.c callers, and follow-up
patches will make use of 'oob_required' in some of the callee functions.

Note that currently, there is no harm in ignoring the 'oob_required' parameter
and *always* utilizing nand_chip.oob_poi, but there can be
performance/complexity/design benefits from avoiding filling oob_poi in the
common case. I will try to implement this for some drivers which can be ported
easily.

Note: I couldn't compile-test all of these easily, as some had ARCH
dependencies.

[dwmw2: Merge later 1/0 vs. true/false cleanup]
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Reviewed-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Acked-by: Jiandong Zheng <jdzheng@broadcom.com>
Acked-by: Mike Dunn <mikedunn@newsguy.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-05-13 23:20:00 -05:00
Mike Dunn
3f91e94f7f mtd: nand: read_page() returns max_bitflips
The ecc.read_page() method for nand drivers is changed to return the maximum
number of bitflips that were corrected on any one region covering an ecc step,
This patch doesn't change what the nand code returns to mtd.

This v2 includes the change to the fsl_ifc_nand driver requested by Scott¹.

¹ http://lists.infradead.org/pipermail/linux-mtd/2012-April/040883.html

Signed-off-by: Mike Dunn <mikedunn@newsguy.com>
Acked-by (freescale changes): Scott Wood <scottwood@freescale.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-05-13 23:12:06 -05:00
Viresh Kumar
e25da1c07d mtd: fsmc_nand: Add clk_{un}prepare() support
clk_{un}prepare is mandatory for platforms using common clock framework. Since
this driver is used by SPEAr platform, which supports common clock framework,
add clk_{un}prepare() support for it.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-05-13 22:53:28 -05:00
Stefan Roese
eea628199d mtd: Add device-tree support to fsmc_nand
This patch adds support to configure the FSMC NAND driver (used amongst
others on SPEAr platforms) via device-tree instead of platform_data.

Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 01:01:07 +01:00
Vipin Kumar
2a5dbead29 mtd: nand/fsmc: Remove sparse warnings and errors
This patch removes the sparse below warnings and errors for nand/fsmc driver
/root/vipin/spear/kernel/3.3/linux-3.3/drivers/mtd/nand/fsmc_nand.c:363:31:
warning: incorrect type in initializer (different address spaces)
/root/vipin/spear/kernel/3.3/linux-3.3/drivers/mtd/nand/fsmc_nand.c:363:31:
expected struct fsmc_regs *regs
/root/vipin/spear/kernel/3.3/linux-3.3/drivers/mtd/nand/fsmc_nand.c:363:31:
got void [noderef] <asn:2>*regs_va

[...]

Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 01:00:30 +01:00
Vipin Kumar
4774fb0a48 mtd: nand/fsmc: Add DMA support
The fsmc_nand driver uses cpu to read/write onto the device. This is inefficient
because of two reasons
- the cpu gets locked on AHB bus while reading from NAND
- the cpu is unnecessarily used when dma can do the job

This patch adds the support for accessing the device through DMA

Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Reviewed-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 01:00:24 +01:00
Vipin Kumar
604e75444f mtd: nand/fsmc: Access the NAND device word by word whenever possible
The default way of accessing nand device is using the nand width. This means
that 8bit devices are using u8 * and 16bit devices are accessed using u16 *.

This results in a non-optimal performance since the FSMC is designed to
translate the normal word accesses into device width based accesses. This patch
implements read_buf and write_buf callbacks using word by word accesses.

Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Reviewed-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 01:00:14 +01:00
Vipin Kumar
712c4add03 mtd: nand/fsmc: Use dev_err to report error scenario
fsmc controller takes time to calculate the bch8 codes and the error offsets.
The calculate logic checks for completion upto a timeout. This patch adds a
error print when this timer expires and the ecc or error offsets are not yet
calculated.

Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Reviewed-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 00:59:49 +01:00
Vipin Kumar
82b9dbe2e0 mtd: nand/fsmc: Use devm routines
fsmc_nand driver currently uses normal kzalloc, request_mem etc routines. This
patch replaces these routines with devm_kzalloc and devm_request_mem_region etc.
Consequently, the error and driver removal scenarios are curtailed.

Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Reviewed-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 00:59:42 +01:00
Vipin Kumar
e2f6bce8d9 mtd: nand/fsmc: Modify fsmc driver to accept nand timing parameters via platform
FSMC controllers provide registers to program the required timing values for
attached NAND device. The timing values used until now are relaxed and should
work for all devices.

Although, for read/write performance improvements, the fsmc nand driver should
accept nand timings as a platform data and program the timing parameters into
fsmc registers accordingly.

This patch implements this modification. Additionally, it programs the default
timing parameters if these are not passed via platform data.

Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 00:59:34 +01:00
Shiraz Hashim
f63acb75c5 mtd: fsmc_nand: add pm callbacks to support hibernation
Signed-off-by: Shiraz Hashim <shiraz.hashim@st.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 00:59:14 +01:00
Vipin Kumar
467e6e7be2 mtd: nand/fsmc: Initialize the badblockbits to 7
Ideally, the block should have 0xff written on the bad block position. Any value
other than 0xff implies a bad block. In practical situations, there can be
bit flips in the oob area as well which means that a block with 0x7f being read
at bad block position may imply a bad block but it is infact only a bit flip in
the bad block byte.

To resolve this problem, the block is marked as good if number of high bits is
greater than or equal to badblockbits (initialized to 7)

Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 00:59:02 +01:00
Vipin Kumar
b533f8d84f mtd: nand/fsmc: Flip the bit only if the error index is < 4096
ECC can correct up to 8 bits in 512 bytes data + 13 bytes ecc. This means that
the algorithm can correct a max of 8 bits in 4200 bits ie the error indices can
be from 0 to 4199. Of these 0 to 4095 are for data and 4096 to 4199 for ecc.

The driver flips the bit only if the index is <= 4096. This is a bug since the
data bits are only from 0 to 4095.

This patch modifies the check as < 4096

Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 00:58:43 +01:00
Vipin Kumar
aea686b47c mtd: nand/fsmc: Read only 512 + 13 bytes for 8bit NAND devices
The ECC logic of FSMC works on 512 bytes data + 13 bytes ECC to generate error
indices of up to 8 incorrect bits. The FSMC driver reads 14 instead of 13 oob
bytes to accommodate for 16 bit device as well.

Unfortunately, the internal ecc state machine gets corrupted for 8 bit devices
reading 512 + 14 bytes of data resulting in error indices not getting reported.

Fix this by reading 14 bytes only for 16 bit devices

Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 00:58:25 +01:00
Vipin Kumar
4cbe1bf07a mtd: nand/fsmc: Correct the multiline comment format
Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 00:58:05 +01:00
Armando Visconti
04f168524e mtd: nand/fsmc: Remove default partition information from driver
Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 00:57:44 +01:00
Vipin Kumar
7147032485 mtd: nand/fsmc: Pass partition information through platform data
This patch reimplements the passing of partition information through platform
data. This was unintentionally deleted in commit
0d04eda143
"mtd: fsmc_nand.c: use mtd_device_parse_register"

Artem: fix gcc warning about passin 0 instead of NULL.

Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Acked-by: Stefan Roese <sr@denx.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Cc: stable@kernel.org [3.2+]
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 00:57:32 +01:00
Mike Dunn
6a918bade9 mtd: flash drivers set ecc strength
Flash device drivers initialize 'ecc_strength' in struct mtd_info, which is the
maximum number of bit errors that can be corrected in one writesize region.

Drivers using the nand interface intitialize 'strength' in struct nand_ecc_ctrl,
which is the maximum number of bit errors that can be corrected in one ecc step.
Nand infrastructure code translates this to 'ecc_strength'.

Also for nand drivers, the nand infrastructure code sets ecc.strength for ecc
modes NAND_ECC_SOFT, NAND_ECC_SOFT_BCH, and NAND_ECC_NONE.  It is set in the
driver for all other modes.

Signed-off-by: Mike Dunn <mikedunn@newsguy.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 00:56:46 +01:00
Artem Bityutskiy
42d7fbe223 mtd: do not use plain 0 as NULL
The first 3 arguments of 'mtd_device_parse_register()' are pointers,
but many callers pass '0' instead of 'NULL'. Fix this globally. Thanks
to coccinelle for making it easy to do with the following semantic patch:

 @@
 expression mtd, types, parser_data, parts, nr_parts;
 @@
 (
 -mtd_device_parse_register(mtd, 0, parser_data, parts, nr_parts)
 +mtd_device_parse_register(mtd, NULL, parser_data, parts, nr_parts)
 |
 -mtd_device_parse_register(mtd, types, 0, parts, nr_parts)
 +mtd_device_parse_register(mtd, types, NULL, parts, nr_parts)
 |
 -mtd_device_parse_register(mtd, types, parser_data, 0, nr_parts)
 +mtd_device_parse_register(mtd, types, parser_data, NULL, nr_parts)
 )

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 00:53:20 +01:00
Armando Visconti
0c78e93b44 mtd: fsmc: Support of 224-bytes OOB area length
The current patch is required to support EVALSPEAR1340CPU
Revision 2 where a new (ONFI compliant) MT29F16G08 NAND
flash from Micron is present.

This NAND flash device defines a OOB area which is
224 bytes long (oobsize).

Signed-off-by: Armando Visconti <armando.visconti@st.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 00:50:00 +01:00
Armando Visconti
753e0139e5 mtd: fsmc: Improve the fsmc_correct_data() routine
This patch improves the error correction routine for bch8
- Loop only up to number of errors detected
- Improve the error index calculation procedure

Additionally, it also renames the "correct" routine to indicate that it is bch8
specific

Signed-off-by: Armando Visconti <armando.visconti@st.com>
Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 00:48:06 +01:00
Armando Visconti
a612c2ae48 mtd: fsmc: fixed data abort inside change_bit()
Since change_bit() requires a (unsigned int *) as second arg,
the correct definition of err_idx[] array declared as
local variable of fsmc_correct_data() is the following:

	u32 err_idx[8];

Signed-off-by: Armando Visconti <armando.visconti@st.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 00:47:55 +01:00
Shiraz Hashim
b2acc92e14 mtd: fsmc: use ALE and CLE offsets from platform data
ALE and CLE offsets can be different on different devices. Let devices
pass these offsets to the fsmc driver through platform data.

Signed-off-by: Shiraz Hashim <shiraz.hashim@st.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 00:45:55 +01:00
Bhavna Yadav
e29ee57b1d mtd: fsmc_nand: ECC1 & ECC4 layout separated for different page sizes
ECC1 & ECC4 layout for NAND of different pages sizes for e.g. 512bytes,
2KiB, 4KiB and 8KiB are separated. Previously there existed one ECC4
layout for 2KiB & 4KiB page size due to which oob test module available
in drivers/mtd/nand/test was failing.

Signed-off-by: Bhavna Yadav <bhavna.yadav@st.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 00:45:11 +01:00
Vipin Kumar
519300cfe1 mtd: fsmc: Newly erased page read algorithm implemented
A newly erased page contains ff in data as well as spare area. While reading an
erased page, the read out ecc from spare area does not match the ecc generated
by fsmc ecc hardware accelerator. This is because ecc of data ff ff is not ff
ff. This leads to errors when file system erases and reads back the pages to
ensure consistency.

This patch adds a software workaround to ensure that the ecc check is not
performed for erased pages. This problem is solved by checking the number of
bits (in 512 byte data + 13 byte ecc) which are 0. If these number of bits are
less than 8, the page is considered erased and correction algorithm is not tried
on that page

Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2012-03-27 00:44:57 +01:00
Dmitry Eremin-Solenikov
0d04eda143 mtd: fsmc_nand.c: use mtd_device_parse_register
Replace custom invocations of parse_mtd_partitions and mtd_device_register
with common mtd_device_parse_register call. This would bring: standard
handling of all errors, fallback to default partitions, etc.

Linus Walleij: fixed compilation breakage

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-09-11 15:02:08 +03:00
Dmitry Eremin-Solenikov
8d3f8bb809 mtd: fsmc_nand don't specify default parsing options
Since 'cmdline, NULL' is now a default for parse_mtd_partitions, don't specify
this in every driver, instead pass NULL to force parse_mtd_partitions
to use default.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-09-11 15:02:01 +03:00
Axel Lin
82e023ab4e mtd: fsmc_nand: fix a memory leak
In fsmc_nand_remove, we should call nand_release instead of
mtd_device_unregister to properly free bad block table memory
and bad block descriptor memory.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-09-11 15:01:59 +03:00
Jamie Iles
99335d0002 mtd: fsmc_nand: convert to mtd_device_register()
Convert to mtd_device_register() and remove the CONFIG_MTD_PARTITIONS
preprocessor conditionals as partitioning is always available.

Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2011-05-25 02:23:28 +01:00
Lucas De Marchi
25985edced Fix common misspellings
Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
2011-03-31 11:26:23 -03:00
Linus Walleij
593cd87112 mtd: FSMC NAND use the PrimeCell identifier macros
The FSMC actually has a standard ARM PrimeCell ID register, and
the "revision" part of that register contains the thing that
the code is looking at. Reuse the infrastructure from the AMBA
bus abstraction and rid local defines.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2010-12-03 16:35:30 +00:00
Linus Walleij
4ad916bca7 mtd: FSMC NAND remove PARTITION macro and fix compile noise
This removes the PARTITION macro that David didn't like and also
removes a local variable that was dangling unused in some #ifdefs
by being a bit more clever.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2010-12-03 16:35:10 +00:00
Linus Walleij
6c009ab89a mtd: generic FSMC NAND MTD driver
This is the same driver submitted by ST Micros SPEAr team but
generalized and tested on the ST-Ericsson U300. It probably
easily works on the NHK8815 too.

Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Signed-off-by: Rajeev Kumar <rajeev-dlh.kumar@st.com>
Signed-off-by: Shiraz Hashim <shiraz.hashim@st.com>
Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2010-10-25 00:33:48 +01:00