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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 | // SPDX-License-Identifier: GPL-2.0 /* * Author: Mario Kicherer <dev@kicherer.org> */ #include <linux/device.h> #include <linux/kernel.h> #include <linux/mtd/spinand.h> #define SPINAND_MFR_ALLIANCEMEMORY 0x52 #define AM_STATUS_ECC_BITMASK (3 << 4) #define AM_STATUS_ECC_NONE_DETECTED (0 << 4) #define AM_STATUS_ECC_CORRECTED (1 << 4) #define AM_STATUS_ECC_ERRORED (2 << 4) #define AM_STATUS_ECC_MAX_CORRECTED (3 << 4) static SPINAND_OP_VARIANTS(read_cache_variants, SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 1, NULL, 0), SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0), SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0), SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0), SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0), SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0)); static SPINAND_OP_VARIANTS(write_cache_variants, SPINAND_PROG_LOAD_X4(true, 0, NULL, 0), SPINAND_PROG_LOAD(true, 0, NULL, 0)); static SPINAND_OP_VARIANTS(update_cache_variants, SPINAND_PROG_LOAD_X4(false, 0, NULL, 0), SPINAND_PROG_LOAD(false, 0, NULL, 0)); static int am_get_eccsize(struct mtd_info *mtd) { if (mtd->oobsize == 64) return 0x20; else if (mtd->oobsize == 128) return 0x38; else if (mtd->oobsize == 256) return 0x70; else return -EINVAL; } static int am_ooblayout_ecc(struct mtd_info *mtd, int section, struct mtd_oob_region *region) { int ecc_bytes; ecc_bytes = am_get_eccsize(mtd); if (ecc_bytes < 0) return ecc_bytes; region->offset = mtd->oobsize - ecc_bytes; region->length = ecc_bytes; return 0; } static int am_ooblayout_free(struct mtd_info *mtd, int section, struct mtd_oob_region *region) { int ecc_bytes; if (section) return -ERANGE; ecc_bytes = am_get_eccsize(mtd); if (ecc_bytes < 0) return ecc_bytes; /* * It is unclear how many bytes are used for the bad block marker. We * reserve the common two bytes here. * * The free area in this kind of flash is divided into chunks where the * first 4 bytes of each chunk are unprotected. The number of chunks * depends on the specific model. The models with 4096+256 bytes pages * have 8 chunks, the others 4 chunks. */ region->offset = 2; region->length = mtd->oobsize - 2 - ecc_bytes; return 0; } static const struct mtd_ooblayout_ops am_ooblayout = { .ecc = am_ooblayout_ecc, .free = am_ooblayout_free, }; static int am_ecc_get_status(struct spinand_device *spinand, u8 status) { switch (status & AM_STATUS_ECC_BITMASK) { case AM_STATUS_ECC_NONE_DETECTED: return 0; case AM_STATUS_ECC_CORRECTED: /* * use oobsize to determine the flash model and the maximum of * correctable errors and return maximum - 1 by convention */ if (spinand->base.mtd.oobsize == 64) return 3; else return 7; case AM_STATUS_ECC_ERRORED: return -EBADMSG; case AM_STATUS_ECC_MAX_CORRECTED: /* * use oobsize to determine the flash model and the maximum of * correctable errors */ if (spinand->base.mtd.oobsize == 64) return 4; else return 8; default: break; } return -EINVAL; } static const struct spinand_info alliancememory_spinand_table[] = { SPINAND_INFO("AS5F34G04SND", SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0x2f), NAND_MEMORG(1, 2048, 128, 64, 4096, 80, 1, 1, 1), NAND_ECCREQ(4, 512), SPINAND_INFO_OP_VARIANTS(&read_cache_variants, &write_cache_variants, &update_cache_variants), SPINAND_HAS_QE_BIT, SPINAND_ECCINFO(&am_ooblayout, am_ecc_get_status)), }; static const struct spinand_manufacturer_ops alliancememory_spinand_manuf_ops = { }; const struct spinand_manufacturer alliancememory_spinand_manufacturer = { .id = SPINAND_MFR_ALLIANCEMEMORY, .name = "AllianceMemory", .chips = alliancememory_spinand_table, .nchips = ARRAY_SIZE(alliancememory_spinand_table), .ops = &alliancememory_spinand_manuf_ops, }; |