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/*
* Copyright (C) 2017 Free Electrons
* Copyright (C) 2017 NextThing Co
*
* Author: Boris Brezillon <boris.brezillon@free-electrons.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/mtd/rawnand.h>
/* Bit for detecting BENAND */
#define TOSHIBA_NAND_ID4_IS_BENAND BIT(7)
/* Recommended to rewrite for BENAND */
#define TOSHIBA_NAND_STATUS_REWRITE_RECOMMENDED BIT(3)
static int toshiba_nand_benand_eccstatus(struct mtd_info *mtd,
struct nand_chip *chip)
{
int ret;
unsigned int max_bitflips = 0;
u8 status;
/* Check Status */
ret = nand_status_op(chip, &status);
if (ret)
return ret;
if (status & NAND_STATUS_FAIL) {
/* uncorrected */
mtd->ecc_stats.failed++;
} else if (status & TOSHIBA_NAND_STATUS_REWRITE_RECOMMENDED) {
/* corrected */
max_bitflips = mtd->bitflip_threshold;
mtd->ecc_stats.corrected += max_bitflips;
}
return max_bitflips;
}
static int
toshiba_nand_read_page_benand(struct mtd_info *mtd,
struct nand_chip *chip, uint8_t *buf,
int oob_required, int page)
{
int ret;
ret = nand_read_page_raw(mtd, chip, buf, oob_required, page);
if (ret)
return ret;
return toshiba_nand_benand_eccstatus(mtd, chip);
}
static int
toshiba_nand_read_subpage_benand(struct mtd_info *mtd,
struct nand_chip *chip, uint32_t data_offs,
uint32_t readlen, uint8_t *bufpoi, int page)
{
int ret;
ret = nand_read_page_op(chip, page, data_offs,
bufpoi + data_offs, readlen);
if (ret)
return ret;
return toshiba_nand_benand_eccstatus(mtd, chip);
}
static void toshiba_nand_benand_init(struct nand_chip *chip)
{
struct mtd_info *mtd = nand_to_mtd(chip);
/*
* On BENAND, the entire OOB region can be used by the MTD user.
* The calculated ECC bytes are stored into other isolated
* area which is not accessible to users.
* This is why chip->ecc.bytes = 0.
*/
chip->ecc.bytes = 0;
chip->ecc.size = 512;
chip->ecc.strength = 8;
chip->ecc.read_page = toshiba_nand_read_page_benand;
chip->ecc.read_subpage = toshiba_nand_read_subpage_benand;
chip->ecc.write_page = nand_write_page_raw;
chip->ecc.read_page_raw = nand_read_page_raw_notsupp;
chip->ecc.write_page_raw = nand_write_page_raw_notsupp;
chip->options |= NAND_SUBPAGE_READ;
mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
}
static void toshiba_nand_decode_id(struct nand_chip *chip)
{
struct mtd_info *mtd = nand_to_mtd(chip);
nand_decode_ext_id(chip);
/*
* Toshiba 24nm raw SLC (i.e., not BENAND) have 32B OOB per
* 512B page. For Toshiba SLC, we decode the 5th/6th byte as
* follows:
* - ID byte 6, bits[2:0]: 100b -> 43nm, 101b -> 32nm,
* 110b -> 24nm
* - ID byte 5, bit[7]: 1 -> BENAND, 0 -> raw SLC
*/
if (chip->id.len >= 6 && nand_is_slc(chip) &&
(chip->id.data[5] & 0x7) == 0x6 /* 24nm */ &&
!(chip->id.data[4] & 0x80) /* !BENAND */)
mtd->oobsize = 32 * mtd->writesize >> 9;
/*
* Extract ECC requirements from 6th id byte.
* For Toshiba SLC, ecc requrements are as follows:
* - 43nm: 1 bit ECC for each 512Byte is required.
* - 32nm: 4 bit ECC for each 512Byte is required.
* - 24nm: 8 bit ECC for each 512Byte is required.
*/
if (chip->id.len >= 6 && nand_is_slc(chip)) {
chip->ecc_step_ds = 512;
switch (chip->id.data[5] & 0x7) {
case 0x4:
chip->ecc_strength_ds = 1;
break;
case 0x5:
chip->ecc_strength_ds = 4;
break;
case 0x6:
chip->ecc_strength_ds = 8;
break;
default:
WARN(1, "Could not get ECC info");
chip->ecc_step_ds = 0;
break;
}
}
}
static int toshiba_nand_init(struct nand_chip *chip)
{
if (nand_is_slc(chip))
chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
/* Check that chip is BENAND and ECC mode is on-die */
if (nand_is_slc(chip) && chip->ecc.mode == NAND_ECC_ON_DIE &&
chip->id.data[4] & TOSHIBA_NAND_ID4_IS_BENAND)
toshiba_nand_benand_init(chip);
return 0;
}
const struct nand_manufacturer_ops toshiba_nand_manuf_ops = {
.detect = toshiba_nand_decode_id,
.init = toshiba_nand_init,
};
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