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mtd: nand: allow drivers to request minimum alignment for passed buffer

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In some cases, nand_do_{read,write}_ops is passed with unaligned
ops->datbuf.  Drivers using DMA will be unhappy about unaligned
buffer.

The new struct member, buf_align, represents the minimum alignment
the driver require for the buffer.  If the buffer passed from the
upper MTD layer does not have enough alignment, nand_do_*_ops will
use bufpoi.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Masahiro Yamada 2017-03-30 17:15:05 +09:00 • committed by Boris Brezillon
parent 3deb9979c7
commit 477544c62a
2 changed files with 10 additions and 2 deletions
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2
include/linux/mtd/nand.h
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@ -755,6 +755,7 @@ struct nand_manufacturer_ops {
* setting the read-retry mode. Mostly needed for MLC NAND.
* @ecc: [BOARDSPECIFIC] ECC control structure
* @buffers: buffer structure for read/write
* @buf_align: minimum buffer alignment required by a platform
* @hwcontrol: platform-specific hardware control structure
* @erase: [REPLACEABLE] erase function
* @scan_bbt: [REPLACEABLE] function to scan bad block table
@ -905,6 +906,7 @@ struct nand_chip {
struct nand_ecc_ctrl ecc;
struct nand_buffers *buffers;
unsigned long buf_align;
struct nand_hw_control hwcontrol;
uint8_t *bbt;