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mtd: nand: qcom: switch to mtd_ooblayout_ops 

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Tested-by: Archit Taneja <architt@codeaurora.org>
This commit is contained in:
Boris Brezillon 2016-03-18 17:54:27 +01:00
parent 3cf32d1802
commit 421e81c4c6
1 changed files with 38 additions and 49 deletions
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87
drivers/mtd/nand/qcom_nandc.c
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@ -1707,61 +1707,52 @@ static void qcom_nandc_select_chip(struct mtd_info *mtd, int chipnr)
* This layout is read as is when ECC is disabled. When ECC is enabled, the
* inaccessible Bad Block byte(s) are ignored when we write to a page/oob,
* and assumed as 0xffs when we read a page/oob. The ECC, unused and
* dummy/real bad block bytes are grouped as ecc bytes in nand_ecclayout (i.e,
* ecc->bytes is the sum of the three).
* dummy/real bad block bytes are grouped as ecc bytes (i.e, ecc->bytes is
* the sum of the three).
*/
static struct nand_ecclayout *
qcom_nand_create_layout(struct qcom_nand_host *host)
static int qcom_nand_ooblayout_ecc(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
struct nand_chip *chip = &host->chip;
struct mtd_info *mtd = nand_to_mtd(chip);
struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
struct nand_chip *chip = mtd_to_nand(mtd);
struct qcom_nand_host *host = to_qcom_nand_host(chip);
struct nand_ecc_ctrl *ecc = &chip->ecc;
struct nand_ecclayout *layout;
int i, j, steps, pos = 0, shift = 0;
layout = devm_kzalloc(nandc->dev, sizeof(*layout), GFP_KERNEL);
if (!layout)
return NULL;
if (section > 1)
return -ERANGE;
steps = mtd->writesize / ecc->size;
layout->eccbytes = steps * ecc->bytes;
layout->oobfree[0].offset = (steps - 1) * ecc->bytes + host->bbm_size;
layout->oobfree[0].length = steps << 2;
/*
* the oob bytes in the first n - 1 codewords are all grouped together
* in the format:
* DUMMY_BBM + UNUSED + ECC
*/
for (i = 0; i < steps - 1; i++) {
for (j = 0; j < ecc->bytes; j++)
layout->eccpos[pos++] = i * ecc->bytes + j;
if (!section) {
oobregion->length = (ecc->bytes * (ecc->steps - 1)) +
host->bbm_size;
oobregion->offset = 0;
} else {
oobregion->length = host->ecc_bytes_hw + host->spare_bytes;
oobregion->offset = mtd->oobsize - oobregion->length;
}
/*
* the oob bytes in the last codeword are grouped in the format:
* BBM + FREE OOB + UNUSED + ECC
*/
/* fill up the bbm positions */
for (j = 0; j < host->bbm_size; j++)
layout->eccpos[pos++] = i * ecc->bytes + j;
/*
* fill up the ecc and reserved positions, their indices are offseted
* by the free oob region
*/
shift = layout->oobfree[0].length + host->bbm_size;
for (j = 0; j < (host->ecc_bytes_hw + host->spare_bytes); j++)
layout->eccpos[pos++] = i * ecc->bytes + shift + j;
return layout;
return 0;
}
static int qcom_nand_ooblayout_free(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct qcom_nand_host *host = to_qcom_nand_host(chip);
struct nand_ecc_ctrl *ecc = &chip->ecc;
if (section)
return -ERANGE;
oobregion->length = ecc->steps * 4;
oobregion->offset = ((ecc->steps - 1) * ecc->bytes) + host->bbm_size;
return 0;
}
static const struct mtd_ooblayout_ops qcom_nand_ooblayout_ops = {
.ecc = qcom_nand_ooblayout_ecc,
.free = qcom_nand_ooblayout_free,
};
static int qcom_nand_host_setup(struct qcom_nand_host *host)
{
struct nand_chip *chip = &host->chip;
@ -1848,9 +1839,7 @@ static int qcom_nand_host_setup(struct qcom_nand_host *host)
ecc->mode = NAND_ECC_HW;
ecc->layout = qcom_nand_create_layout(host);
if (!ecc->layout)
return -ENOMEM;
mtd_set_ooblayout(mtd, &qcom_nand_ooblayout_ops);
cwperpage = mtd->writesize / ecc->size;