summaryrefslogtreecommitdiffstats
path: root/drivers/mtd/spi-nor/sst.c
blob: e0af6d25d573b184df5c37c1ff75dec2c5f087a3 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2005, Intec Automation Inc.
 * Copyright (C) 2014, Freescale Semiconductor, Inc.
 */

#include <linux/mtd/spi-nor.h>

#include "core.h"

static const struct flash_info sst_parts[] = {
	/* SST -- large erase sizes are "overlays", "sectors" are 4K */
	{ "sst25vf040b", INFO(0xbf258d, 0, 64 * 1024,  8,
			      SECT_4K | SST_WRITE) },
	{ "sst25vf080b", INFO(0xbf258e, 0, 64 * 1024, 16,
			      SECT_4K | SST_WRITE) },
	{ "sst25vf016b", INFO(0xbf2541, 0, 64 * 1024, 32,
			      SECT_4K | SST_WRITE) },
	{ "sst25vf032b", INFO(0xbf254a, 0, 64 * 1024, 64,
			      SECT_4K | SST_WRITE) },
	{ "sst25vf064c", INFO(0xbf254b, 0, 64 * 1024, 128, SECT_4K) },
	{ "sst25wf512",  INFO(0xbf2501, 0, 64 * 1024,  1,
			      SECT_4K | SST_WRITE) },
	{ "sst25wf010",  INFO(0xbf2502, 0, 64 * 1024,  2,
			      SECT_4K | SST_WRITE) },
	{ "sst25wf020",  INFO(0xbf2503, 0, 64 * 1024,  4,
			      SECT_4K | SST_WRITE) },
	{ "sst25wf020a", INFO(0x621612, 0, 64 * 1024,  4, SECT_4K) },
	{ "sst25wf040b", INFO(0x621613, 0, 64 * 1024,  8, SECT_4K) },
	{ "sst25wf040",  INFO(0xbf2504, 0, 64 * 1024,  8,
			      SECT_4K | SST_WRITE) },
	{ "sst25wf080",  INFO(0xbf2505, 0, 64 * 1024, 16,
			      SECT_4K | SST_WRITE) },
	{ "sst26wf016b", INFO(0xbf2651, 0, 64 * 1024, 32,
			      SECT_4K | SPI_NOR_DUAL_READ |
			      SPI_NOR_QUAD_READ) },
	{ "sst26vf016b", INFO(0xbf2641, 0, 64 * 1024, 32,
			      SECT_4K | SPI_NOR_DUAL_READ) },
	{ "sst26vf064b", INFO(0xbf2643, 0, 64 * 1024, 128,
			      SECT_4K | SPI_NOR_DUAL_READ |
			      SPI_NOR_QUAD_READ) },
};

static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
		     size_t *retlen, const u_char *buf)
{
	struct spi_nor *nor = mtd_to_spi_nor(mtd);
	size_t actual = 0;
	int ret;

	dev_dbg(nor->dev, "to 0x%08x, len %zd\n", (u32)to, len);

	ret = spi_nor_lock_and_prep(nor);
	if (ret)
		return ret;

	ret = spi_nor_write_enable(nor);
	if (ret)
		goto out;

	nor->sst_write_second = false;

	/* Start write from odd address. */
	if (to % 2) {
		nor->program_opcode = SPINOR_OP_BP;

		/* write one byte. */
		ret = spi_nor_write_data(nor, to, 1, buf);
		if (ret < 0)
			goto out;
		WARN(ret != 1, "While writing 1 byte written %i bytes\n", ret);
		ret = spi_nor_wait_till_ready(nor);
		if (ret)
			goto out;

		to++;
		actual++;
	}

	/* Write out most of the data here. */
	for (; actual < len - 1; actual += 2) {
		nor->program_opcode = SPINOR_OP_AAI_WP;

		/* write two bytes. */
		ret = spi_nor_write_data(nor, to, 2, buf + actual);
		if (ret < 0)
			goto out;
		WARN(ret != 2, "While writing 2 bytes written %i bytes\n", ret);
		ret = spi_nor_wait_till_ready(nor);
		if (ret)
			goto out;
		to += 2;
		nor->sst_write_second = true;
	}
	nor->sst_write_second = false;

	ret = spi_nor_write_disable(nor);
	if (ret)
		goto out;

	ret = spi_nor_wait_till_ready(nor);
	if (ret)
		goto out;

	/* Write out trailing byte if it exists. */
	if (actual != len) {
		ret = spi_nor_write_enable(nor);
		if (ret)
			goto out;

		nor->program_opcode = SPINOR_OP_BP;
		ret = spi_nor_write_data(nor, to, 1, buf + actual);
		if (ret < 0)
			goto out;
		WARN(ret != 1, "While writing 1 byte written %i bytes\n", ret);
		ret = spi_nor_wait_till_ready(nor);
		if (ret)
			goto out;

		actual += 1;

		ret = spi_nor_write_disable(nor);
	}
out:
	*retlen += actual;
	spi_nor_unlock_and_unprep(nor);
	return ret;
}

static void sst_default_init(struct spi_nor *nor)
{
	nor->flags |= SNOR_F_HAS_LOCK;
}

static void sst_post_sfdp_fixups(struct spi_nor *nor)
{
	if (nor->info->flags & SST_WRITE)
		nor->mtd._write = sst_write;
}

static const struct spi_nor_fixups sst_fixups = {
	.default_init = sst_default_init,
	.post_sfdp = sst_post_sfdp_fixups,
};

const struct spi_nor_manufacturer spi_nor_sst = {
	.name = "sst",
	.parts = sst_parts,
	.nparts = ARRAY_SIZE(sst_parts),
	.fixups = &sst_fixups,
};