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author | Brian Norris <computersforpeace@gmail.com> | 2012-05-02 19:14:55 +0200 |
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committer | David Woodhouse <David.Woodhouse@intel.com> | 2012-05-14 06:20:00 +0200 |
commit | 1fbb938dff5b6bb4514a4e7600276b03c7f08e25 (patch) | |
tree | 49ab8089580041bcbd767ff7a57aa7188ee6b6c0 /drivers/mtd/nand/Makefile | |
parent | mtd: add read_byte support to plat_nand (diff) | |
download | linux-1fbb938dff5b6bb4514a4e7600276b03c7f08e25.tar.xz linux-1fbb938dff5b6bb4514a4e7600276b03c7f08e25.zip |
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>
Diffstat (limited to 'drivers/mtd/nand/Makefile')
0 files changed, 0 insertions, 0 deletions