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 11 static void esmt_nand_decode_id(struct nand_chip *chip) 12 { 13 nand_decode_ext_id(chip); 14 15 /* Extract ECC requirements from 5th id byte. */ 16 if (chip->id.len >= 5 && nand_is_slc(chip)) { 17 chip->base.eccreq.step_size = 512; 18 switch (chip->id.data[4] & 0x3) { 19 case 0x0: 20 chip->base.eccreq.strength = 4; 21 break; 22 case 0x1: 23 chip->base.eccreq.strength = 2; 24 break; 25 case 0x2: 26 chip->base.eccreq.strength = 1; 27 break; 28 default: 29 WARN(1, "Could not get ECC info"); 30 chip->base.eccreq.step_size = 0; 31 break; 32 } 33 } 34 } 35 36 static int esmt_nand_init(struct nand_chip *chip) 37 { 38 if (nand_is_slc(chip)) 39 /* 40 * It is known that some ESMT SLC NANDs have been shipped 41 * with the factory bad block markers in the first or last page 42 * of the block, instead of the first or second page. To be on 43 * the safe side, let's check all three locations. 44 */ 45 chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE | 46 NAND_BBM_LASTPAGE; 47 48 return 0; 49 } 50 51 const struct nand_manufacturer_ops esmt_nand_manuf_ops = { 52 .detect = esmt_nand_decode_id, 53 .init = esmt_nand_init, 54 }; 55