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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (C) 2018 Toradex AG4 *5 * Author: Marcel Ziswiler <marcel.ziswiler@toradex.com>6 */7 8#include <linux/mtd/rawnand.h>9#include "internals.h"10 11static void esmt_nand_decode_id(struct nand_chip *chip)12{13 struct nand_device *base = &chip->base;14 struct nand_ecc_props requirements = {};15 16 nand_decode_ext_id(chip);17 18 /* Extract ECC requirements from 5th id byte. */19 if (chip->id.len >= 5 && nand_is_slc(chip)) {20 requirements.step_size = 512;21 switch (chip->id.data[4] & 0x3) {22 case 0x0:23 requirements.strength = 4;24 break;25 case 0x1:26 requirements.strength = 2;27 break;28 case 0x2:29 requirements.strength = 1;30 break;31 default:32 WARN(1, "Could not get ECC info");33 requirements.step_size = 0;34 break;35 }36 }37 38 nanddev_set_ecc_requirements(base, &requirements);39}40 41static int esmt_nand_init(struct nand_chip *chip)42{43 if (nand_is_slc(chip))44 /*45 * It is known that some ESMT SLC NANDs have been shipped46 * with the factory bad block markers in the first or last page47 * of the block, instead of the first or second page. To be on48 * the safe side, let's check all three locations.49 */50 chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE |51 NAND_BBM_LASTPAGE;52 53 return 0;54}55 56const struct nand_manufacturer_ops esmt_nand_manuf_ops = {57 .detect = esmt_nand_decode_id,58 .init = esmt_nand_init,59};60