summaryrefslogtreecommitdiffstats
path: root/drivers/mtd/nand/spi/toshiba.c
blob: db8021da45b5052bffce19dd7e5e4fec7557096d (plain)
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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2018 exceet electronics GmbH
 * Copyright (c) 2018 Kontron Electronics GmbH
 *
 * Author: Frieder Schrempf <frieder.schrempf@kontron.de>
 */

#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/mtd/spinand.h>

#define SPINAND_MFR_TOSHIBA		0x98
#define TOSH_STATUS_ECC_HAS_BITFLIPS_T	(3 << 4)

static SPINAND_OP_VARIANTS(read_cache_variants,
		SPINAND_PAGE_READ_FROM_CACHE_X4_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(true, 0, NULL, 0));

static SPINAND_OP_VARIANTS(update_cache_variants,
		SPINAND_PROG_LOAD(false, 0, NULL, 0));

static int tc58cxgxsx_ooblayout_ecc(struct mtd_info *mtd, int section,
				     struct mtd_oob_region *region)
{
	if (section > 0)
		return -ERANGE;

	region->offset = mtd->oobsize / 2;
	region->length = mtd->oobsize / 2;

	return 0;
}

static int tc58cxgxsx_ooblayout_free(struct mtd_info *mtd, int section,
				      struct mtd_oob_region *region)
{
	if (section > 0)
		return -ERANGE;

	/* 2 bytes reserved for BBM */
	region->offset = 2;
	region->length = (mtd->oobsize / 2) - 2;

	return 0;
}

static const struct mtd_ooblayout_ops tc58cxgxsx_ooblayout = {
	.ecc = tc58cxgxsx_ooblayout_ecc,
	.free = tc58cxgxsx_ooblayout_free,
};

static int tc58cxgxsx_ecc_get_status(struct spinand_device *spinand,
				      u8 status)
{
	struct nand_device *nand = spinand_to_nand(spinand);
	u8 mbf = 0;
	struct spi_mem_op op = SPINAND_GET_FEATURE_OP(0x30, &mbf);

	switch (status & STATUS_ECC_MASK) {
	case STATUS_ECC_NO_BITFLIPS:
		return 0;

	case STATUS_ECC_UNCOR_ERROR:
		return -EBADMSG;

	case STATUS_ECC_HAS_BITFLIPS:
	case TOSH_STATUS_ECC_HAS_BITFLIPS_T:
		/*
		 * Let's try to retrieve the real maximum number of bitflips
		 * in order to avoid forcing the wear-leveling layer to move
		 * data around if it's not necessary.
		 */
		if (spi_mem_exec_op(spinand->spimem, &op))
			return nand->eccreq.strength;

		mbf >>= 4;

		if (WARN_ON(mbf > nand->eccreq.strength || !mbf))
			return nand->eccreq.strength;

		return mbf;

	default:
		break;
	}

	return -EINVAL;
}

static const struct spinand_info toshiba_spinand_table[] = {
	/* 3.3V 1Gb */
	SPINAND_INFO("TC58CVG0S3", 0xC2,
		     NAND_MEMORG(1, 2048, 128, 64, 1024, 1, 1, 1),
		     NAND_ECCREQ(8, 512),
		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
					      &write_cache_variants,
					      &update_cache_variants),
		     0,
		     SPINAND_ECCINFO(&tc58cxgxsx_ooblayout,
				     tc58cxgxsx_ecc_get_status)),
	/* 3.3V 2Gb */
	SPINAND_INFO("TC58CVG1S3", 0xCB,
		     NAND_MEMORG(1, 2048, 128, 64, 2048, 1, 1, 1),
		     NAND_ECCREQ(8, 512),
		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
					      &write_cache_variants,
					      &update_cache_variants),
		     0,
		     SPINAND_ECCINFO(&tc58cxgxsx_ooblayout,
				     tc58cxgxsx_ecc_get_status)),
	/* 3.3V 4Gb */
	SPINAND_INFO("TC58CVG2S0", 0xCD,
		     NAND_MEMORG(1, 4096, 256, 64, 2048, 1, 1, 1),
		     NAND_ECCREQ(8, 512),
		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
					      &write_cache_variants,
					      &update_cache_variants),
		     0,
		     SPINAND_ECCINFO(&tc58cxgxsx_ooblayout,
				     tc58cxgxsx_ecc_get_status)),
	/* 1.8V 1Gb */
	SPINAND_INFO("TC58CYG0S3", 0xB2,
		     NAND_MEMORG(1, 2048, 128, 64, 1024, 1, 1, 1),
		     NAND_ECCREQ(8, 512),
		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
					      &write_cache_variants,
					      &update_cache_variants),
		     0,
		     SPINAND_ECCINFO(&tc58cxgxsx_ooblayout,
				     tc58cxgxsx_ecc_get_status)),
	/* 1.8V 2Gb */
	SPINAND_INFO("TC58CYG1S3", 0xBB,
		     NAND_MEMORG(1, 2048, 128, 64, 2048, 1, 1, 1),
		     NAND_ECCREQ(8, 512),
		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
					      &write_cache_variants,
					      &update_cache_variants),
		     0,
		     SPINAND_ECCINFO(&tc58cxgxsx_ooblayout,
				     tc58cxgxsx_ecc_get_status)),
	/* 1.8V 4Gb */
	SPINAND_INFO("TC58CYG2S0", 0xBD,
		     NAND_MEMORG(1, 4096, 256, 64, 2048, 1, 1, 1),
		     NAND_ECCREQ(8, 512),
		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
					      &write_cache_variants,
					      &update_cache_variants),
		     0,
		     SPINAND_ECCINFO(&tc58cxgxsx_ooblayout,
				     tc58cxgxsx_ecc_get_status)),
};

static int toshiba_spinand_detect(struct spinand_device *spinand)
{
	u8 *id = spinand->id.data;
	int ret;

	/*
	 * Toshiba SPI NAND read ID needs a dummy byte,
	 * so the first byte in id is garbage.
	 */
	if (id[1] != SPINAND_MFR_TOSHIBA)
		return 0;

	ret = spinand_match_and_init(spinand, toshiba_spinand_table,
				     ARRAY_SIZE(toshiba_spinand_table),
				     id[2]);
	if (ret)
		return ret;

	return 1;
}

static const struct spinand_manufacturer_ops toshiba_spinand_manuf_ops = {
	.detect = toshiba_spinand_detect,
};

const struct spinand_manufacturer toshiba_spinand_manufacturer = {
	.id = SPINAND_MFR_TOSHIBA,
	.name = "Toshiba",
	.ops = &toshiba_spinand_manuf_ops,
};