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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/nand.h>
struct nand_onfi_vendor_micron {
u8 two_plane_read;
u8 read_cache;
u8 read_unique_id;
u8 dq_imped;
u8 dq_imped_num_settings;
u8 dq_imped_feat_addr;
u8 rb_pulldown_strength;
u8 rb_pulldown_strength_feat_addr;
u8 rb_pulldown_strength_num_settings;
u8 otp_mode;
u8 otp_page_start;
u8 otp_data_prot_addr;
u8 otp_num_pages;
u8 otp_feat_addr;
u8 read_retry_options;
u8 reserved[72];
u8 param_revision;
} __packed;
static int micron_nand_setup_read_retry(struct mtd_info *mtd, int retry_mode)
{
struct nand_chip *chip = mtd_to_nand(mtd);
u8 feature[ONFI_SUBFEATURE_PARAM_LEN] = {retry_mode};
return chip->onfi_set_features(mtd, chip, ONFI_FEATURE_ADDR_READ_RETRY,
feature);
}
/*
* Configure chip properties from Micron vendor-specific ONFI table
*/
static int micron_nand_onfi_init(struct nand_chip *chip)
{
struct nand_onfi_params *p = &chip->onfi_params;
struct nand_onfi_vendor_micron *micron = (void *)p->vendor;
if (!chip->onfi_version)
return 0;
if (le16_to_cpu(p->vendor_revision) < 1)
return 0;
chip->read_retries = micron->read_retry_options;
chip->setup_read_retry = micron_nand_setup_read_retry;
return 0;
}
static int micron_nand_init(struct nand_chip *chip)
{
struct mtd_info *mtd = nand_to_mtd(chip);
int ret;
ret = micron_nand_onfi_init(chip);
if (ret)
return ret;
if (mtd->writesize == 2048)
chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
return 0;
}
const struct nand_manufacturer_ops micron_nand_manuf_ops = {
.init = micron_nand_init,
};
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