diff options
Diffstat (limited to 'drivers/mtd/nand/nand_esmt.c')
| -rw-r--r-- | drivers/mtd/nand/nand_esmt.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/drivers/mtd/nand/nand_esmt.c b/drivers/mtd/nand/nand_esmt.c new file mode 100644 index 0000000000..3338c68aaa --- /dev/null +++ b/drivers/mtd/nand/nand_esmt.c @@ -0,0 +1,54 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2018 Toradex AG + * + * Author: Marcel Ziswiler <marcel.ziswiler@toradex.com> + */ + +#include <linux/mtd/rawnand.h> +#include "internals.h" + +static void esmt_nand_decode_id(struct nand_chip *chip) +{ + nand_decode_ext_id(chip); + + /* Extract ECC requirements from 5th id byte. */ + if (chip->id.len >= 5 && nand_is_slc(chip)) { + chip->base.eccreq.step_size = 512; + switch (chip->id.data[4] & 0x3) { + case 0x0: + chip->base.eccreq.strength = 4; + break; + case 0x1: + chip->base.eccreq.strength = 2; + break; + case 0x2: + chip->base.eccreq.strength = 1; + break; + default: + WARN(1, "Could not get ECC info"); + chip->base.eccreq.step_size = 0; + break; + } + } +} + +static int esmt_nand_init(struct nand_chip *chip) +{ + if (nand_is_slc(chip)) + /* + * It is known that some ESMT SLC NANDs have been shipped + * with the factory bad block markers in the first or last page + * of the block, instead of the first or second page. To be on + * the safe side, let's check all three locations. + */ + chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE | + NAND_BBM_LASTPAGE; + + return 0; +} + +const struct nand_manufacturer_ops esmt_nand_manuf_ops = { + .detect = esmt_nand_decode_id, + .init = esmt_nand_init, +}; |