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mtd: rawnand: Expose monolithic read/write_page_raw() helpers

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The current nand_read/write_page_raw() helpers are already widely used
but do not fit the purpose of "constrained" controllers which cannot,
for instance, separate command/address cycles with data cycles.

Workaround this issue by proposing alternative helpers that can be
used by these controller drivers instead.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-mtd/20200507105241.14299-12-miquel.raynal@bootlin.com
This commit is contained in:
Miquel Raynal 2020-05-07 12:52:39 +02:00
parent daca31765e
commit 658beb6639
2 changed files with 83 additions and 2 deletions
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77
drivers/mtd/nand/raw/nand_base.c
View File

@ -2688,6 +2688,47 @@ int nand_read_page_raw(struct nand_chip *chip, uint8_t *buf, int oob_required,
}
EXPORT_SYMBOL(nand_read_page_raw);
/**
* nand_monolithic_read_page_raw - Monolithic page read in raw mode
* @chip: NAND chip info structure
* @buf: buffer to store read data
* @oob_required: caller requires OOB data read to chip->oob_poi
* @page: page number to read
*
* This is a raw page read, ie. without any error detection/correction.
* Monolithic means we are requesting all the relevant data (main plus
* eventually OOB) to be loaded in the NAND cache and sent over the
* bus (from the NAND chip to the NAND controller) in a single
* operation. This is an alternative to nand_read_page_raw(), which
* first reads the main data, and if the OOB data is requested too,
* then reads more data on the bus.
*/
int nand_monolithic_read_page_raw(struct nand_chip *chip, u8 *buf,
int oob_required, int page)
{
struct mtd_info *mtd = nand_to_mtd(chip);
unsigned int size = mtd->writesize;
u8 *read_buf = buf;
int ret;
if (oob_required) {
size += mtd->oobsize;
if (buf != chip->data_buf)
read_buf = nand_get_data_buf(chip);
}
ret = nand_read_page_op(chip, page, 0, read_buf, size);
if (ret)
return ret;
if (buf != chip->data_buf)
memcpy(buf, read_buf, mtd->writesize);
return 0;
}
EXPORT_SYMBOL(nand_monolithic_read_page_raw);
/**
* nand_read_page_raw_syndrome - [INTERN] read raw page data without ecc
* @chip: nand chip info structure
@ -3696,6 +3737,42 @@ int nand_write_page_raw(struct nand_chip *chip, const uint8_t *buf,
}
EXPORT_SYMBOL(nand_write_page_raw);
/**
* nand_monolithic_write_page_raw - Monolithic page write in raw mode
* @chip: NAND chip info structure
* @buf: data buffer to write
* @oob_required: must write chip->oob_poi to OOB
* @page: page number to write
*
* This is a raw page write, ie. without any error detection/correction.
* Monolithic means we are requesting all the relevant data (main plus
* eventually OOB) to be sent over the bus and effectively programmed
* into the NAND chip arrays in a single operation. This is an
* alternative to nand_write_page_raw(), which first sends the main
* data, then eventually send the OOB data by latching more data
* cycles on the NAND bus, and finally sends the program command to
* synchronyze the NAND chip cache.
*/
int nand_monolithic_write_page_raw(struct nand_chip *chip, const u8 *buf,
int oob_required, int page)
{
struct mtd_info *mtd = nand_to_mtd(chip);
unsigned int size = mtd->writesize;
u8 *write_buf = (u8 *)buf;
if (oob_required) {
size += mtd->oobsize;
if (buf != chip->data_buf) {
write_buf = nand_get_data_buf(chip);
memcpy(write_buf, buf, mtd->writesize);
}
}
return nand_prog_page_op(chip, page, 0, write_buf, size);
}
EXPORT_SYMBOL(nand_monolithic_write_page_raw);
/**
* nand_write_page_raw_syndrome - [INTERN] raw page write function
* @chip: nand chip info structure

8
include/linux/mtd/rawnand.h
View File

@ -1328,13 +1328,17 @@ int nand_read_oob_std(struct nand_chip *chip, int page);
int nand_get_set_features_notsupp(struct nand_chip *chip, int addr,
u8 *subfeature_param);
/* Default read_page_raw implementation */
/* read_page_raw implementations */
int nand_read_page_raw(struct nand_chip *chip, uint8_t *buf, int oob_required,
int page);
int nand_monolithic_read_page_raw(struct nand_chip *chip, uint8_t *buf,
int oob_required, int page);
/* Default write_page_raw implementation */
/* write_page_raw implementations */
int nand_write_page_raw(struct nand_chip *chip, const uint8_t *buf,
int oob_required, int page);
int nand_monolithic_write_page_raw(struct nand_chip *chip, const uint8_t *buf,
int oob_required, int page);
/* Reset and initialize a NAND device */
int nand_reset(struct nand_chip *chip, int chipnr);