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mtd: nand: Support controllers with custom page

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If your controller already sends the required NAND commands when
reading or writing a page, then the framework is not supposed to
send READ0 and SEQIN/PAGEPROG respectively.

Signed-off-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Marc Gonzalez
2016-11-15 10:56:20 +01:00
committed by Boris Brezillon
parent fc80f21a11
commit 3371d663bb
2 changed files with 43 additions and 3 deletions
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34
drivers/mtd/nand/nand_base.c
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@@ -1961,7 +1961,8 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from,
__func__, buf);
read_retry:
chip->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page);
if (nand_standard_page_accessors(&chip->ecc))
chip->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page);
/*
* Now read the page into the buffer. Absent an error,
@@ -2649,7 +2650,8 @@ static int nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
else
subpage = 0;
chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
if (nand_standard_page_accessors(&chip->ecc))
chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
if (unlikely(raw))
status = chip->ecc.write_page_raw(mtd, chip, buf,
@@ -2672,7 +2674,8 @@ static int nand_write_page(struct mtd_info *mtd, struct nand_chip *chip,
if (!cached || !NAND_HAS_CACHEPROG(chip)) {
chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
if (nand_standard_page_accessors(&chip->ecc))
chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
status = chip->waitfunc(mtd, chip);
/*
* See if operation failed and additional status checks are
@@ -4511,6 +4514,26 @@ static bool nand_ecc_strength_good(struct mtd_info *mtd)
return corr >= ds_corr && ecc->strength >= chip->ecc_strength_ds;
}
static bool invalid_ecc_page_accessors(struct nand_chip *chip)
{
struct nand_ecc_ctrl *ecc = &chip->ecc;
if (nand_standard_page_accessors(ecc))
return false;
/*
* NAND_ECC_CUSTOM_PAGE_ACCESS flag is set, make sure the NAND
* controller driver implements all the page accessors because
* default helpers are not suitable when the core does not
* send the READ0/PAGEPROG commands.
*/
return (!ecc->read_page || !ecc->write_page ||
!ecc->read_page_raw || !ecc->write_page_raw ||
(NAND_HAS_SUBPAGE_READ(chip) && !ecc->read_subpage) ||
(NAND_HAS_SUBPAGE_WRITE(chip) && !ecc->write_subpage &&
ecc->hwctl && ecc->calculate));
}
/**
* nand_scan_tail - [NAND Interface] Scan for the NAND device
* @mtd: MTD device structure
@@ -4531,6 +4554,11 @@ int nand_scan_tail(struct mtd_info *mtd)
!(chip->bbt_options & NAND_BBT_USE_FLASH)))
return -EINVAL;
if (invalid_ecc_page_accessors(chip)) {
pr_err("Invalid ECC page accessors setup\n");
return -EINVAL;
}
if (!(chip->options & NAND_OWN_BUFFERS)) {
nbuf = kzalloc(sizeof(*nbuf) + mtd->writesize
+ mtd->oobsize * 3, GFP_KERNEL);