forked from Minki/linux
87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
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/*
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* Copyright (C) 2017 Free Electrons
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* Copyright (C) 2017 NextThing Co
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*
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* Author: Boris Brezillon <boris.brezillon@free-electrons.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/mtd/nand.h>
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struct nand_onfi_vendor_micron {
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u8 two_plane_read;
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u8 read_cache;
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u8 read_unique_id;
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u8 dq_imped;
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u8 dq_imped_num_settings;
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u8 dq_imped_feat_addr;
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u8 rb_pulldown_strength;
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u8 rb_pulldown_strength_feat_addr;
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u8 rb_pulldown_strength_num_settings;
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u8 otp_mode;
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u8 otp_page_start;
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u8 otp_data_prot_addr;
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u8 otp_num_pages;
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u8 otp_feat_addr;
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u8 read_retry_options;
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u8 reserved[72];
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u8 param_revision;
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} __packed;
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static int micron_nand_setup_read_retry(struct mtd_info *mtd, int retry_mode)
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{
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struct nand_chip *chip = mtd_to_nand(mtd);
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u8 feature[ONFI_SUBFEATURE_PARAM_LEN] = {retry_mode};
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return chip->onfi_set_features(mtd, chip, ONFI_FEATURE_ADDR_READ_RETRY,
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feature);
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}
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/*
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* Configure chip properties from Micron vendor-specific ONFI table
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*/
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static int micron_nand_onfi_init(struct nand_chip *chip)
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{
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struct nand_onfi_params *p = &chip->onfi_params;
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struct nand_onfi_vendor_micron *micron = (void *)p->vendor;
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if (!chip->onfi_version)
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return 0;
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if (le16_to_cpu(p->vendor_revision) < 1)
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return 0;
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chip->read_retries = micron->read_retry_options;
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chip->setup_read_retry = micron_nand_setup_read_retry;
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return 0;
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}
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static int micron_nand_init(struct nand_chip *chip)
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{
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struct mtd_info *mtd = nand_to_mtd(chip);
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int ret;
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ret = micron_nand_onfi_init(chip);
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if (ret)
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return ret;
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if (mtd->writesize == 2048)
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chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
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return 0;
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}
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const struct nand_manufacturer_ops micron_nand_manuf_ops = {
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.init = micron_nand_init,
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};
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