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review.trustedfirmware.org / hafnium / third_party / linux.git / 3a0ad55d848b50499b68d7141d4eca997fce28ef / . / drivers / mtd / nand / spi / micron.c
blob: 9c4381d6847b34d225514a990ce1ff6cc5a82b39 [file] [log] [blame]
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2016-2017 Micron Technology, Inc.
4 *
5 * Authors:
6 * Peter Pan <peterpandong@micron.com>
7 */
8
9#include <linux/device.h>
10#include <linux/kernel.h>
11#include <linux/mtd/spinand.h>
12
13#define SPINAND_MFR_MICRON 0x2c
14
15#define MICRON_STATUS_ECC_MASK GENMASK(7, 4)
16#define MICRON_STATUS_ECC_NO_BITFLIPS (0 << 4)
17#define MICRON_STATUS_ECC_1TO3_BITFLIPS (1 << 4)
18#define MICRON_STATUS_ECC_4TO6_BITFLIPS (3 << 4)
19#define MICRON_STATUS_ECC_7TO8_BITFLIPS (5 << 4)
20
21static SPINAND_OP_VARIANTS(read_cache_variants,
22 SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0),
23 SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
24 SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0),
25 SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0),
26 SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
27 SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
28
29static SPINAND_OP_VARIANTS(write_cache_variants,
30 SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
31 SPINAND_PROG_LOAD(true, 0, NULL, 0));
32
33static SPINAND_OP_VARIANTS(update_cache_variants,
34 SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
35 SPINAND_PROG_LOAD(false, 0, NULL, 0));
36
37static int mt29f2g01abagd_ooblayout_ecc(struct mtd_info *mtd, int section,
38 struct mtd_oob_region *region)
39{
40 if (section)
41 return -ERANGE;
42
43 region->offset = 64;
44 region->length = 64;
45
46 return 0;
47}
48
49static int mt29f2g01abagd_ooblayout_free(struct mtd_info *mtd, int section,
50 struct mtd_oob_region *region)
51{
52 if (section)
53 return -ERANGE;
54
55 /* Reserve 2 bytes for the BBM. */
56 region->offset = 2;
57 region->length = 62;
58
59 return 0;
60}
61
62static const struct mtd_ooblayout_ops mt29f2g01abagd_ooblayout = {
63 .ecc = mt29f2g01abagd_ooblayout_ecc,
64 .free = mt29f2g01abagd_ooblayout_free,
65};
66
67static int mt29f2g01abagd_ecc_get_status(struct spinand_device *spinand,
68 u8 status)
69{
70 switch (status & MICRON_STATUS_ECC_MASK) {
71 case STATUS_ECC_NO_BITFLIPS:
72 return 0;
73
74 case STATUS_ECC_UNCOR_ERROR:
75 return -EBADMSG;
76
77 case MICRON_STATUS_ECC_1TO3_BITFLIPS:
78 return 3;
79
80 case MICRON_STATUS_ECC_4TO6_BITFLIPS:
81 return 6;
82
83 case MICRON_STATUS_ECC_7TO8_BITFLIPS:
84 return 8;
85
86 default:
87 break;
88 }
89
90 return -EINVAL;
91}
92
93static const struct spinand_info micron_spinand_table[] = {
94 SPINAND_INFO("MT29F2G01ABAGD", 0x24,
95 NAND_MEMORG(1, 2048, 128, 64, 2048, 2, 1, 1),
96 NAND_ECCREQ(8, 512),
97 SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
98 &write_cache_variants,
99 &update_cache_variants),
100 0,
101 SPINAND_ECCINFO(&mt29f2g01abagd_ooblayout,
102 mt29f2g01abagd_ecc_get_status)),
103};
104
105static int micron_spinand_detect(struct spinand_device *spinand)
106{
107 u8 *id = spinand->id.data;
108 int ret;
109
110 /*
111 * Micron SPI NAND read ID need a dummy byte,
112 * so the first byte in raw_id is dummy.
113 */
114 if (id[1] != SPINAND_MFR_MICRON)
115 return 0;
116
117 ret = spinand_match_and_init(spinand, micron_spinand_table,
118 ARRAY_SIZE(micron_spinand_table), id[2]);
119 if (ret)
120 return ret;
121
122 return 1;
123}
124
125static const struct spinand_manufacturer_ops micron_spinand_manuf_ops = {
126 .detect = micron_spinand_detect,
127};
128
129const struct spinand_manufacturer micron_spinand_manufacturer = {
130 .id = SPINAND_MFR_MICRON,
131 .name = "Micron",
132 .ops = &micron_spinand_manuf_ops,
133};