1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2016-2017 Micron Technology, Inc.
6 * Peter Pan <peterpandong@micron.com>
11 #include <linux/device.h>
12 #include <linux/kernel.h>
14 #include <linux/bitops.h>
15 #include <linux/mtd/spinand.h>
17 #define SPINAND_MFR_MICRON 0x2c
19 #define MICRON_STATUS_ECC_MASK GENMASK(7, 4)
20 #define MICRON_STATUS_ECC_NO_BITFLIPS (0 << 4)
21 #define MICRON_STATUS_ECC_1TO3_BITFLIPS (1 << 4)
22 #define MICRON_STATUS_ECC_4TO6_BITFLIPS (3 << 4)
23 #define MICRON_STATUS_ECC_7TO8_BITFLIPS (5 << 4)
25 static SPINAND_OP_VARIANTS(read_cache_variants,
26 SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0),
27 SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
28 SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0),
29 SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0),
30 SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
31 SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
33 static SPINAND_OP_VARIANTS(write_cache_variants,
34 SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
35 SPINAND_PROG_LOAD(true, 0, NULL, 0));
37 static SPINAND_OP_VARIANTS(update_cache_variants,
38 SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
39 SPINAND_PROG_LOAD(false, 0, NULL, 0));
41 static int mt29f2g01abagd_ooblayout_ecc(struct mtd_info *mtd, int section,
42 struct mtd_oob_region *region)
53 static int mt29f2g01abagd_ooblayout_free(struct mtd_info *mtd, int section,
54 struct mtd_oob_region *region)
59 /* Reserve 2 bytes for the BBM. */
66 static const struct mtd_ooblayout_ops mt29f2g01abagd_ooblayout = {
67 .ecc = mt29f2g01abagd_ooblayout_ecc,
68 .rfree = mt29f2g01abagd_ooblayout_free,
71 static int mt29f2g01abagd_ecc_get_status(struct spinand_device *spinand,
74 switch (status & MICRON_STATUS_ECC_MASK) {
75 case STATUS_ECC_NO_BITFLIPS:
78 case STATUS_ECC_UNCOR_ERROR:
81 case MICRON_STATUS_ECC_1TO3_BITFLIPS:
84 case MICRON_STATUS_ECC_4TO6_BITFLIPS:
87 case MICRON_STATUS_ECC_7TO8_BITFLIPS:
97 static const struct spinand_info micron_spinand_table[] = {
98 SPINAND_INFO("MT29F2G01ABAGD", 0x24,
99 NAND_MEMORG(1, 2048, 128, 64, 2048, 2, 1, 1),
101 SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
102 &write_cache_variants,
103 &update_cache_variants),
105 SPINAND_ECCINFO(&mt29f2g01abagd_ooblayout,
106 mt29f2g01abagd_ecc_get_status)),
109 static int micron_spinand_detect(struct spinand_device *spinand)
111 u8 *id = spinand->id.data;
115 * Micron SPI NAND read ID need a dummy byte,
116 * so the first byte in raw_id is dummy.
118 if (id[1] != SPINAND_MFR_MICRON)
121 ret = spinand_match_and_init(spinand, micron_spinand_table,
122 ARRAY_SIZE(micron_spinand_table), id[2]);
129 static const struct spinand_manufacturer_ops micron_spinand_manuf_ops = {
130 .detect = micron_spinand_detect,
133 const struct spinand_manufacturer micron_spinand_manufacturer = {
134 .id = SPINAND_MFR_MICRON,
136 .ops = µn_spinand_manuf_ops,