summaryrefslogtreecommitdiff
path: root/src/drivers/spi/sst.c
blob: 2d107dcee51561c4b93c6fd8f5ff1f6b00c461d3 (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
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
/* SPDX-License-Identifier: GPL-2.0-or-later */

/*
 * Driver for SST serial flashes
 */

#include <console/console.h>
#include <commonlib/helpers.h>
#include <spi_flash.h>
#include <spi-generic.h>
#include <string.h>

#include "spi_flash_internal.h"

#define CMD_SST_WREN		0x06	/* Write Enable */
#define CMD_SST_WRDI		0x04	/* Write Disable */
#define CMD_SST_RDSR		0x05	/* Read Status Register */
#define CMD_SST_WRSR		0x01	/* Write Status Register */
#define CMD_SST_EWSR		0x50	/* Enable Write Status Register */
#define CMD_SST_READ		0x03	/* Read Data Bytes */
#define CMD_SST_FAST_READ	0x0b	/* Read Data Bytes at Higher Speed */
#define CMD_SST_BP		0x02	/* Byte Program */
#define CMD_SST_PP		0x02	/* Page Program */
#define CMD_SST_AAI_WP		0xAD	/* Auto Address Increment Word Program */
#define CMD_SST_SE		0x20	/* Sector Erase */

#define SST_SR_WIP		(1 << 0)	/* Write-in-Progress */
#define SST_SR_WEL		(1 << 1)	/* Write enable */
#define SST_SR_BP0		(1 << 2)	/* Block Protection 0 */
#define SST_SR_BP1		(1 << 3)	/* Block Protection 1 */
#define SST_SR_BP2		(1 << 4)	/* Block Protection 2 */
#define SST_SR_AAI		(1 << 6)	/* Addressing mode */
#define SST_SR_BPL		(1 << 7)	/* BP bits lock */

static const struct spi_flash_part_id flash_table_ai[] = {
	{
		/* SST25VF040B */
		.id[0] = 0x8d,
		.nr_sectors_shift = 7,
	},{
		/* SST25VF080B */
		.id[0] = 0x8e,
		.nr_sectors_shift = 8,
	},{
		/* SST25VF080 */
		.id[0] = 0x80,
		.nr_sectors_shift = 8,
	},{
		/* SST25VF016B */
		.id[0] = 0x41,
		.nr_sectors_shift = 9,
	},{
		/* SST25VF032B */
		.id[0] = 0x4a,
		.nr_sectors_shift = 10,
	},{
		/* SST25WF512 */
		.id[0] = 0x01,
		.nr_sectors_shift = 4,
	},{
		/* SST25WF010 */
		.id[0] = 0x02,
		.nr_sectors_shift = 5,
	},{
		/* SST25WF020 */
		.id[0] = 0x03,
		.nr_sectors_shift = 6,
	},{
		/* SST25WF040 */
		.id[0] = 0x04,
		.nr_sectors_shift = 7,
	},{
		/* SST25WF080 */
		.id[0] = 0x05,
		.nr_sectors_shift = 8,
	},{
		/* SST25WF080B */
		.id[0] = 0x14,
		.nr_sectors_shift = 8,
	},
};

static const struct spi_flash_part_id flash_table_pp256[] = {
	{
		/* SST25VF064C */
		.id[0] = 0x4b,
		.nr_sectors_shift = 11,
	},
};

static int
sst_enable_writing(const struct spi_flash *flash)
{
	int ret = spi_flash_cmd(&flash->spi, CMD_SST_WREN, NULL, 0);
	if (ret)
		printk(BIOS_WARNING, "SF: Enabling Write failed\n");
	return ret;
}

static int
sst_enable_writing_status(const struct spi_flash *flash)
{
	int ret = spi_flash_cmd(&flash->spi, CMD_SST_EWSR, NULL, 0);
	if (ret)
		printk(BIOS_WARNING, "SF: Enabling Write Status failed\n");
	return ret;
}

static int
sst_disable_writing(const struct spi_flash *flash)
{
	int ret = spi_flash_cmd(&flash->spi, CMD_SST_WRDI, NULL, 0);
	if (ret)
		printk(BIOS_WARNING, "SF: Disabling Write failed\n");
	return ret;
}

static int
sst_byte_write(const struct spi_flash *flash, u32 offset, const void *buf)
{
	int ret;
	u8 cmd[4] = {
		CMD_SST_BP,
		offset >> 16,
		offset >> 8,
		offset,
	};

#if CONFIG(DEBUG_SPI_FLASH)
	printk(BIOS_SPEW, "BP[%02x]: %p => cmd = { 0x%02x 0x%06x }\n",
		spi_w8r8(&flash->spi, CMD_SST_RDSR), buf, cmd[0], offset);
#endif

	ret = sst_enable_writing(flash);
	if (ret)
		return ret;

	ret = spi_flash_cmd_write(&flash->spi, cmd, sizeof(cmd), buf, 1);
	if (ret)
		return ret;

	return spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT_MS);
}

static int sst_write_ai(const struct spi_flash *flash, u32 offset, size_t len,
			const void *buf)
{
	size_t actual, cmd_len;
	int ret = 0;
	u8 cmd[4];

	/* If the data is not word aligned, write out leading single byte */
	actual = offset % 2;
	if (actual) {
		ret = sst_byte_write(flash, offset, buf);
		if (ret)
			goto done;
	}
	offset += actual;

	ret = sst_enable_writing(flash);
	if (ret)
		goto done;

	cmd_len = 4;
	cmd[0] = CMD_SST_AAI_WP;
	cmd[1] = offset >> 16;
	cmd[2] = offset >> 8;
	cmd[3] = offset;

	for (; actual < len - 1; actual += 2) {
#if CONFIG(DEBUG_SPI_FLASH)
		printk(BIOS_SPEW, "WP[%02x]: %p => cmd = { 0x%02x 0x%06x }\n",
		     spi_w8r8(&flash->spi, CMD_SST_RDSR), buf + actual, cmd[0],
		     offset);
#endif

		ret = spi_flash_cmd_write(&flash->spi, cmd, cmd_len,
		                          buf + actual, 2);
		if (ret) {
			printk(BIOS_WARNING, "SF: SST word program failed\n");
			break;
		}

		ret = spi_flash_cmd_wait_ready(flash,
				SPI_FLASH_PROG_TIMEOUT_MS);
		if (ret)
			break;

		cmd_len = 1;
		offset += 2;
	}

	if (!ret)
		ret = sst_disable_writing(flash);

	/* If there is a single trailing byte, write it out */
	if (!ret && actual != len)
		ret = sst_byte_write(flash, offset, buf + actual);

done:
#if CONFIG(DEBUG_SPI_FLASH)
	printk(BIOS_SPEW, "SF: SST: program %s %zu bytes @ 0x%lx\n",
	      ret ? "failure" : "success", len, (unsigned long)offset - actual);
#endif
	return ret;
}

/* Flash powers up read-only, so clear BP# bits */
static int sst_unlock(const struct spi_flash *flash)
{
	int ret;
	u8 cmd, status;

	ret = sst_enable_writing_status(flash);
	if (ret)
		return ret;

	cmd = CMD_SST_WRSR;
	status = 0;
	ret = spi_flash_cmd_write(&flash->spi, &cmd, 1, &status, 1);
	if (ret)
		printk(BIOS_WARNING, "SF: Unable to set status byte\n");

	printk(BIOS_INFO, "SF: SST: status = %x\n", spi_w8r8(&flash->spi, CMD_SST_RDSR));

	return ret;
}

static const struct spi_flash_ops_descriptor descai = {
	.erase_cmd = CMD_SST_SE,
	.status_cmd = CMD_SST_RDSR,
	.wren_cmd = CMD_SST_WREN,
	.ops = {
		.read = spi_flash_cmd_read,
		.write = sst_write_ai,
		.erase = spi_flash_cmd_erase,
		.status = spi_flash_cmd_status,
	},
};

const struct spi_flash_vendor_info spi_flash_sst_ai_vi = {
	.id = VENDOR_ID_SST,
	.sector_size_kib_shift = 2,
	.match_id_mask[0] = 0xff,
	.ids = flash_table_ai,
	.nr_part_ids = ARRAY_SIZE(flash_table_ai),
	.desc = &descai,
	.after_probe = sst_unlock,
};

const struct spi_flash_vendor_info spi_flash_sst_vi = {
	.id = VENDOR_ID_SST,
	.page_size_shift = 8,
	.sector_size_kib_shift = 2,
	.match_id_mask[0] = 0xff,
	.ids = flash_table_pp256,
	.nr_part_ids = ARRAY_SIZE(flash_table_pp256),
	.desc = &spi_flash_pp_0x20_sector_desc,
	.after_probe = sst_unlock,
};