diff options
| author | Boris Brezillon <bbrezillon@kernel.org> | 2018-10-28 15:27:55 +0100 |
|---|---|---|
| committer | Miquel Raynal <miquel.raynal@bootlin.com> | 2019-04-08 10:21:13 +0200 |
| commit | eeab717483e5fb529c8001d36fbda14011905e5f (patch) | |
| tree | 370fe60ea2de0ee3d6847dad53ba2abeea8c1b71 /include/linux | |
| parent | a7ab085d7c16a7367a0c93ee39d0750d23b537f9 (diff) | |
mtd: rawnand: Provide a helper to get chip->data_buf
We plan to move cache related fields to a pagecache struct in nand_chip
but some drivers access ->pagebuf directly to invalidate the cache
before they start using ->data_buf.
Let's provide an helper that returns a pointer to ->data_buf after
invalidating the cache.
Signed-off-by: Boris Brezillon <bbrezillon@kernel.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/mtd/rawnand.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h index 58887cb2c7ea..253f9942a919 100644 --- a/include/linux/mtd/rawnand.h +++ b/include/linux/mtd/rawnand.h @@ -1350,4 +1350,25 @@ int nand_gpio_waitrdy(struct nand_chip *chip, struct gpio_desc *gpiod, void nand_select_target(struct nand_chip *chip, unsigned int cs); void nand_deselect_target(struct nand_chip *chip); +/** + * nand_get_data_buf() - Get the internal page buffer + * @chip: NAND chip object + * + * Returns the pre-allocated page buffer after invalidating the cache. This + * function should be used by drivers that do not want to allocate their own + * bounce buffer and still need such a buffer for specific operations (most + * commonly when reading OOB data only). + * + * Be careful to never call this function in the write/write_oob path, because + * the core may have placed the data to be written out in this buffer. + * + * Return: pointer to the page cache buffer + */ +static inline void *nand_get_data_buf(struct nand_chip *chip) +{ + chip->pagebuf = -1; + + return chip->data_buf; +} + #endif /* __LINUX_MTD_RAWNAND_H */ |