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mtd: rawnand: nandsim: convert driver to nand_scan()

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Two helpers have been added to the core to do all kind of controller
side configuration/initialization between the detection phase and the
final NAND scan. Implement these hooks so that we can convert the driver
to just use nand_scan() instead of the nand_scan_ident() +
nand_scan_tail() pair.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
This commit is contained in:
Miquel Raynal 2018-07-20 17:15:08 +02:00
parent 96fa8e6e26
commit 5cbad9e3da
1 changed files with 45 additions and 37 deletions
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82
drivers/mtd/nand/raw/nandsim.c
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@ -2192,6 +2192,48 @@ static void ns_nand_read_buf(struct mtd_info *mtd, u_char *buf, int len)
return;
}
static int ns_attach_chip(struct nand_chip *chip)
{
unsigned int eccsteps, eccbytes;
if (!bch)
return 0;
if (!mtd_nand_has_bch()) {
NS_ERR("BCH ECC support is disabled\n");
return -EINVAL;
}
/* Use 512-byte ecc blocks */
eccsteps = nsmtd->writesize / 512;
eccbytes = ((bch * 13) + 7) / 8;
/* Do not bother supporting small page devices */
if (nsmtd->oobsize < 64 || !eccsteps) {
NS_ERR("BCH not available on small page devices\n");
return -EINVAL;
}
if (((eccbytes * eccsteps) + 2) > nsmtd->oobsize) {
NS_ERR("Invalid BCH value %u\n", bch);
return -EINVAL;
}
chip->ecc.mode = NAND_ECC_SOFT;
chip->ecc.algo = NAND_ECC_BCH;
chip->ecc.size = 512;
chip->ecc.strength = bch;
chip->ecc.bytes = eccbytes;
NS_INFO("Using %u-bit/%u bytes BCH ECC\n", bch, chip->ecc.size);
return 0;
}
static const struct nand_controller_ops ns_controller_ops = {
.attach_chip = ns_attach_chip,
};
/*
* Module initialization function
*/
@ -2276,44 +2318,10 @@ static int __init ns_init_module(void)
if ((retval = parse_gravepages()) != 0)
goto error;
retval = nand_scan_ident(nsmtd, 1, NULL);
chip->dummy_controller.ops = &ns_controller_ops;
retval = nand_scan(nsmtd, 1);
if (retval) {
NS_ERR("cannot scan NAND Simulator device\n");
goto error;
}
if (bch) {
unsigned int eccsteps, eccbytes;
if (!mtd_nand_has_bch()) {
NS_ERR("BCH ECC support is disabled\n");
retval = -EINVAL;
goto error;
}
/* use 512-byte ecc blocks */
eccsteps = nsmtd->writesize/512;
eccbytes = (bch*13+7)/8;
/* do not bother supporting small page devices */
if ((nsmtd->oobsize < 64) || !eccsteps) {
NS_ERR("bch not available on small page devices\n");
retval = -EINVAL;
goto error;
}
if ((eccbytes*eccsteps+2) > nsmtd->oobsize) {
NS_ERR("invalid bch value %u\n", bch);
retval = -EINVAL;
goto error;
}
chip->ecc.mode = NAND_ECC_SOFT;
chip->ecc.algo = NAND_ECC_BCH;
chip->ecc.size = 512;
chip->ecc.strength = bch;
chip->ecc.bytes = eccbytes;
NS_INFO("using %u-bit/%u bytes BCH ECC\n", bch, chip->ecc.size);
}
retval = nand_scan_tail(nsmtd);
if (retval) {
NS_ERR("can't register NAND Simulator\n");
NS_ERR("Could not scan NAND Simulator device\n");
goto error;
}