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mtd: rawnand: Provide a helper to get chip->data_buf

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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>
This commit is contained in:
Boris Brezillon
2018-10-28 15:27:55 +01:00
committed by Miquel Raynal
parent a7ab085d7c
commit eeab717483
8 changed files with 56 additions and 49 deletions
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21
include/linux/mtd/rawnand.h
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@@ -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 */