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mtd: rawnand: Add nand_extract_bits()

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There are cases where ECC bytes are not byte-aligned. Indeed, BCH
implies using a number of ECC bits, which are not always a multiple of
8. We then need a helper like nand_extract_bits() to extract these
syndromes from a buffer.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-mtd/20200519074549.23673-5-miquel.raynal@bootlin.com
This commit is contained in:
Miquel Raynal
2020-05-19 09:45:45 +02:00
parent 0651ed5082
commit d7904619ea
2 changed files with 48 additions and 0 deletions
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4
include/linux/mtd/rawnand.h
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@@ -1414,6 +1414,10 @@ 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);
/* Bitops */
void nand_extract_bits(u8 *dst, unsigned int dst_off, const u8 *src,
unsigned int src_off, unsigned int nbits);
/**
* nand_get_data_buf() - Get the internal page buffer
* @chip: NAND chip object