1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2018 Macronix 4 * 5 * Author: Boris Brezillon <boris.brezillon@bootlin.com> 6 */ 7 8 #include <linux/device.h> 9 #include <linux/kernel.h> 10 #include <linux/mtd/spinand.h> 11 12 #define SPINAND_MFR_MACRONIX 0xC2 13 #define MACRONIX_ECCSR_MASK 0x0F 14 15 static SPINAND_OP_VARIANTS(read_cache_variants, 16 SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0), 17 SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0), 18 SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0), 19 SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0)); 20 21 static SPINAND_OP_VARIANTS(write_cache_variants, 22 SPINAND_PROG_LOAD_X4(true, 0, NULL, 0), 23 SPINAND_PROG_LOAD(true, 0, NULL, 0)); 24 25 static SPINAND_OP_VARIANTS(update_cache_variants, 26 SPINAND_PROG_LOAD_X4(false, 0, NULL, 0), 27 SPINAND_PROG_LOAD(false, 0, NULL, 0)); 28 29 static int mx35lfxge4ab_ooblayout_ecc(struct mtd_info *mtd, int section, 30 struct mtd_oob_region *region) 31 { 32 return -ERANGE; 33 } 34 35 static int mx35lfxge4ab_ooblayout_free(struct mtd_info *mtd, int section, 36 struct mtd_oob_region *region) 37 { 38 if (section) 39 return -ERANGE; 40 41 region->offset = 2; 42 region->length = mtd->oobsize - 2; 43 44 return 0; 45 } 46 47 static const struct mtd_ooblayout_ops mx35lfxge4ab_ooblayout = { 48 .ecc = mx35lfxge4ab_ooblayout_ecc, 49 .free = mx35lfxge4ab_ooblayout_free, 50 }; 51 52 static int mx35lf1ge4ab_get_eccsr(struct spinand_device *spinand, u8 *eccsr) 53 { 54 struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(0x7c, 1), 55 SPI_MEM_OP_NO_ADDR, 56 SPI_MEM_OP_DUMMY(1, 1), 57 SPI_MEM_OP_DATA_IN(1, eccsr, 1)); 58 59 int ret = spi_mem_exec_op(spinand->spimem, &op); 60 if (ret) 61 return ret; 62 63 *eccsr &= MACRONIX_ECCSR_MASK; 64 return 0; 65 } 66 67 static int mx35lf1ge4ab_ecc_get_status(struct spinand_device *spinand, 68 u8 status) 69 { 70 struct nand_device *nand = spinand_to_nand(spinand); 71 u8 eccsr; 72 73 switch (status & STATUS_ECC_MASK) { 74 case STATUS_ECC_NO_BITFLIPS: 75 return 0; 76 77 case STATUS_ECC_UNCOR_ERROR: 78 return -EBADMSG; 79 80 case STATUS_ECC_HAS_BITFLIPS: 81 /* 82 * Let's try to retrieve the real maximum number of bitflips 83 * in order to avoid forcing the wear-leveling layer to move 84 * data around if it's not necessary. 85 */ 86 if (mx35lf1ge4ab_get_eccsr(spinand, &eccsr)) 87 return nand->eccreq.strength; 88 89 if (WARN_ON(eccsr > nand->eccreq.strength || !eccsr)) 90 return nand->eccreq.strength; 91 92 return eccsr; 93 94 default: 95 break; 96 } 97 98 return -EINVAL; 99 } 100 101 static const struct spinand_info macronix_spinand_table[] = { 102 SPINAND_INFO("MX35LF1GE4AB", 0x12, 103 NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 1), 104 NAND_ECCREQ(4, 512), 105 SPINAND_INFO_OP_VARIANTS(&read_cache_variants, 106 &write_cache_variants, 107 &update_cache_variants), 108 SPINAND_HAS_QE_BIT, 109 SPINAND_ECCINFO(&mx35lfxge4ab_ooblayout, 110 mx35lf1ge4ab_ecc_get_status)), 111 SPINAND_INFO("MX35LF2GE4AB", 0x22, 112 NAND_MEMORG(1, 2048, 64, 64, 2048, 40, 2, 1, 1), 113 NAND_ECCREQ(4, 512), 114 SPINAND_INFO_OP_VARIANTS(&read_cache_variants, 115 &write_cache_variants, 116 &update_cache_variants), 117 SPINAND_HAS_QE_BIT, 118 SPINAND_ECCINFO(&mx35lfxge4ab_ooblayout, NULL)), 119 }; 120 121 static int macronix_spinand_detect(struct spinand_device *spinand) 122 { 123 u8 *id = spinand->id.data; 124 int ret; 125 126 /* 127 * Macronix SPI NAND read ID needs a dummy byte, so the first byte in 128 * raw_id is garbage. 129 */ 130 if (id[1] != SPINAND_MFR_MACRONIX) 131 return 0; 132 133 ret = spinand_match_and_init(spinand, macronix_spinand_table, 134 ARRAY_SIZE(macronix_spinand_table), 135 id[2]); 136 if (ret) 137 return ret; 138 139 return 1; 140 } 141 142 static const struct spinand_manufacturer_ops macronix_spinand_manuf_ops = { 143 .detect = macronix_spinand_detect, 144 }; 145 146 const struct spinand_manufacturer macronix_spinand_manufacturer = { 147 .id = SPINAND_MFR_MACRONIX, 148 .name = "Macronix", 149 .ops = ¯onix_spinand_manuf_ops, 150 }; 151