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mtd: rawnand: Add a helper for calculating a page index

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For LUN crossing boundaries, it is handy to know what is the index of
the last page in a LUN. This helper will soon be reused. At the same
time I rename page_per_lun to ppl in the calling function to clarify the
lines.

Cc: stable@vger.kernel.org # v6.7
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20240223115545.354541-3-miquel.raynal@bootlin.com
This commit is contained in:
Miquel Raynal 2024-02-23 12:55:44 +01:00
parent c7ee7c8d4b
commit df9803bf5a
1 changed files with 11 additions and 5 deletions
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16
drivers/mtd/nand/raw/nand_base.c
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@ -1211,19 +1211,25 @@ static int nand_lp_exec_read_page_op(struct nand_chip *chip, unsigned int page,
return nand_exec_op(chip, &op);
}
static unsigned int rawnand_last_page_of_lun(unsigned int pages_per_lun, unsigned int lun)
{
/* lun is expected to be very small */
return (lun * pages_per_lun) + pages_per_lun - 1;
}
static void rawnand_cap_cont_reads(struct nand_chip *chip)
{
struct nand_memory_organization *memorg;
unsigned int pages_per_lun, first_lun, last_lun;
unsigned int ppl, first_lun, last_lun;
memorg = nanddev_get_memorg(&chip->base);
pages_per_lun = memorg->pages_per_eraseblock * memorg->eraseblocks_per_lun;
first_lun = chip->cont_read.first_page / pages_per_lun;
last_lun = chip->cont_read.last_page / pages_per_lun;
ppl = memorg->pages_per_eraseblock * memorg->eraseblocks_per_lun;
first_lun = chip->cont_read.first_page / ppl;
last_lun = chip->cont_read.last_page / ppl;
/* Prevent sequential cache reads across LUN boundaries */
if (first_lun != last_lun)
chip->cont_read.pause_page = first_lun * pages_per_lun + pages_per_lun - 1;
chip->cont_read.pause_page = rawnand_last_page_of_lun(ppl, first_lun);
else
chip->cont_read.pause_page = chip->cont_read.last_page;
}