nand_esmt.c (1387B)
1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Copyright (C) 2018 Toradex AG 4 * 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 shipped 46 * with the factory bad block markers in the first or last page 47 * of the block, instead of the first or second page. To be on 48 * 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};