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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / aae95882232a24ee49c89d0356febf3685a87c8a / . / drivers / mtd / nand / spi / micron.c
blob: 83951c5d0f7290ff195d55977ea559ee7aae7c56 [file] [log] [blame]
Peter Pan883d8772018-08-16 17:30:13 +0200[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#ifndef __UBOOT__
10#include <linux/device.h>
11#include <linux/kernel.h>
12#endif
13#include <linux/mtd/spinand.h>
14
15#define SPINAND_MFR_MICRON 0x2c
16
17#define MICRON_STATUS_ECC_MASK GENMASK(7, 4)
18#define MICRON_STATUS_ECC_NO_BITFLIPS (0 << 4)
19#define MICRON_STATUS_ECC_1TO3_BITFLIPS (1 << 4)
20#define MICRON_STATUS_ECC_4TO6_BITFLIPS (3 << 4)
21#define MICRON_STATUS_ECC_7TO8_BITFLIPS (5 << 4)
22
23static SPINAND_OP_VARIANTS(read_cache_variants,
24 SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0),
25 SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
26 SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0),
27 SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0),
28 SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
29 SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
30
31static SPINAND_OP_VARIANTS(write_cache_variants,
32 SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
33 SPINAND_PROG_LOAD(true, 0, NULL, 0));
34
35static SPINAND_OP_VARIANTS(update_cache_variants,
36 SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
37 SPINAND_PROG_LOAD(false, 0, NULL, 0));
38
39static int mt29f2g01abagd_ooblayout_ecc(struct mtd_info *mtd, int section,
40 struct mtd_oob_region *region)
41{
42 if (section)
43 return -ERANGE;
44
45 region->offset = 64;
46 region->length = 64;
47
48 return 0;
49}
50
51static int mt29f2g01abagd_ooblayout_free(struct mtd_info *mtd, int section,
52 struct mtd_oob_region *region)
53{
54 if (section)
55 return -ERANGE;
56
57 /* Reserve 2 bytes for the BBM. */
58 region->offset = 2;
59 region->length = 62;
60
61 return 0;
62}
63
64static const struct mtd_ooblayout_ops mt29f2g01abagd_ooblayout = {
65 .ecc = mt29f2g01abagd_ooblayout_ecc,
66 .free = mt29f2g01abagd_ooblayout_free,
67};
68
69static int mt29f2g01abagd_ecc_get_status(struct spinand_device *spinand,
70 u8 status)
71{
72 switch (status & MICRON_STATUS_ECC_MASK) {
73 case STATUS_ECC_NO_BITFLIPS:
74 return 0;
75
76 case STATUS_ECC_UNCOR_ERROR:
77 return -EBADMSG;
78
79 case MICRON_STATUS_ECC_1TO3_BITFLIPS:
80 return 3;
81
82 case MICRON_STATUS_ECC_4TO6_BITFLIPS:
83 return 6;
84
85 case MICRON_STATUS_ECC_7TO8_BITFLIPS:
86 return 8;
87
88 default:
89 break;
90 }
91
92 return -EINVAL;
93}
94
95static const struct spinand_info micron_spinand_table[] = {
96 SPINAND_INFO("MT29F2G01ABAGD", 0x24,
97 NAND_MEMORG(1, 2048, 128, 64, 2048, 2, 1, 1),
98 NAND_ECCREQ(8, 512),
99 SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
100 &write_cache_variants,
101 &update_cache_variants),
102 0,
103 SPINAND_ECCINFO(&mt29f2g01abagd_ooblayout,
104 mt29f2g01abagd_ecc_get_status)),
105};
106
107static int micron_spinand_detect(struct spinand_device *spinand)
108{
109 u8 *id = spinand->id.data;
110 int ret;
111
112 /*
113 * Micron SPI NAND read ID need a dummy byte,
114 * so the first byte in raw_id is dummy.
115 */
116 if (id[1] != SPINAND_MFR_MICRON)
117 return 0;
118
119 ret = spinand_match_and_init(spinand, micron_spinand_table,
120 ARRAY_SIZE(micron_spinand_table), id[2]);
121 if (ret)
122 return ret;
123
124 return 1;
125}
126
127static const struct spinand_manufacturer_ops micron_spinand_manuf_ops = {
128 .detect = micron_spinand_detect,
129};
130
131const struct spinand_manufacturer micron_spinand_manufacturer = {
132 .id = SPINAND_MFR_MICRON,
133 .name = "Micron",
134 .ops = &micron_spinand_manuf_ops,
135};