summaryrefslogtreecommitdiff
path: root/drivers/mtd/spi/stmicro.c
blob: c999b125e3ed7476692f4cff148443a5f22484aa (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
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
/*
 * (C) Copyright 2000-2002
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * Copyright 2008, Network Appliance Inc.
 * Jason McMullan <mcmullan@netapp.com>
 *
 * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
 * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <malloc.h>
#include <spi_flash.h>

#include "spi_flash_internal.h"

/* M25Pxx-specific commands */
#define CMD_M25PXX_WREN		0x06	/* Write Enable */
#define CMD_M25PXX_WRDI		0x04	/* Write Disable */
#define CMD_M25PXX_RDSR		0x05	/* Read Status Register */
#define CMD_M25PXX_WRSR		0x01	/* Write Status Register */
#define CMD_M25PXX_READ		0x03	/* Read Data Bytes */
#define CMD_M25PXX_FAST_READ	0x0b	/* Read Data Bytes at Higher Speed */
#define CMD_M25PXX_PP		0x02	/* Page Program */
#define CMD_M25PXX_SE		0xd8	/* Sector Erase */
#define CMD_M25PXX_BE		0xc7	/* Bulk Erase */
#define CMD_M25PXX_DP		0xb9	/* Deep Power-down */
#define CMD_M25PXX_RES		0xab	/* Release from DP, and Read Signature */

#define STM_ID_M25P16		0x15
#define STM_ID_M25P20		0x12
#define STM_ID_M25P32		0x16
#define STM_ID_M25P40		0x13
#define STM_ID_M25P64		0x17
#define STM_ID_M25P80		0x14
#define STM_ID_M25P128		0x18

#define STMICRO_SR_WIP		(1 << 0)	/* Write-in-Progress */

struct stmicro_spi_flash_params {
	u8 idcode1;
	u16 page_size;
	u16 pages_per_sector;
	u16 nr_sectors;
	const char *name;
};

struct stmicro_spi_flash {
	const struct stmicro_spi_flash_params *params;
	struct spi_flash flash;
};

static inline struct stmicro_spi_flash *to_stmicro_spi_flash(struct spi_flash
							     *flash)
{
	return container_of(flash, struct stmicro_spi_flash, flash);
}

static const struct stmicro_spi_flash_params stmicro_spi_flash_table[] = {
	{
		.idcode1 = STM_ID_M25P16,
		.page_size = 256,
		.pages_per_sector = 256,
		.nr_sectors = 32,
		.name = "M25P16",
	},
	{
		.idcode1 = STM_ID_M25P20,
		.page_size = 256,
		.pages_per_sector = 256,
		.nr_sectors = 4,
		.name = "M25P20",
	},
	{
		.idcode1 = STM_ID_M25P32,
		.page_size = 256,
		.pages_per_sector = 256,
		.nr_sectors = 64,
		.name = "M25P32",
	},
	{
		.idcode1 = STM_ID_M25P40,
		.page_size = 256,
		.pages_per_sector = 256,
		.nr_sectors = 8,
		.name = "M25P40",
	},
	{
		.idcode1 = STM_ID_M25P64,
		.page_size = 256,
		.pages_per_sector = 256,
		.nr_sectors = 128,
		.name = "M25P64",
	},
	{
		.idcode1 = STM_ID_M25P80,
		.page_size = 256,
		.pages_per_sector = 256,
		.nr_sectors = 16,
		.name = "M25P80",
	},
	{
		.idcode1 = STM_ID_M25P128,
		.page_size = 256,
		.pages_per_sector = 1024,
		.nr_sectors = 64,
		.name = "M25P128",
	},
};

static int stmicro_wait_ready(struct spi_flash *flash, unsigned long timeout)
{
	struct spi_slave *spi = flash->spi;
	unsigned long timebase;
	int ret;
	u8 status;
	u8 cmd[4] = { CMD_M25PXX_RDSR, 0xff, 0xff, 0xff };

	ret = spi_xfer(spi, 32, &cmd[0], NULL, SPI_XFER_BEGIN);
	if (ret) {
		debug("SF: Failed to send command %02x: %d\n", cmd, ret);
		return ret;
	}

	timebase = get_timer(0);
	do {
		ret = spi_xfer(spi, 8, NULL, &status, 0);
		if (ret)
			return -1;

		if ((status & STMICRO_SR_WIP) == 0)
			break;

	} while (get_timer(timebase) < timeout);

	spi_xfer(spi, 0, NULL, NULL, SPI_XFER_END);

	if ((status & STMICRO_SR_WIP) == 0)
		return 0;

	/* Timed out */
	return -1;
}

static int stmicro_read_fast(struct spi_flash *flash,
			     u32 offset, size_t len, void *buf)
{
	struct stmicro_spi_flash *stm = to_stmicro_spi_flash(flash);
	unsigned long page_addr;
	unsigned long page_size;
	u8 cmd[5];

	page_size = stm->params->page_size;
	page_addr = offset / page_size;

	cmd[0] = CMD_READ_ARRAY_FAST;
	cmd[1] = page_addr >> 8;
	cmd[2] = page_addr;
	cmd[3] = offset % page_size;
	cmd[4] = 0x00;

	return spi_flash_read_common(flash, cmd, sizeof(cmd), buf, len);
}

static int stmicro_write(struct spi_flash *flash,
			 u32 offset, size_t len, const void *buf)
{
	struct stmicro_spi_flash *stm = to_stmicro_spi_flash(flash);
	unsigned long page_addr;
	unsigned long byte_addr;
	unsigned long page_size;
	size_t chunk_len;
	size_t actual;
	int ret;
	u8 cmd[4];

	page_size = stm->params->page_size;
	page_addr = offset / page_size;
	byte_addr = offset % page_size;

	ret = spi_claim_bus(flash->spi);
	if (ret) {
		debug("SF: Unable to claim SPI bus\n");
		return ret;
	}

	ret = 0;
	for (actual = 0; actual < len; actual += chunk_len) {
		chunk_len = min(len - actual, page_size - byte_addr);

		cmd[0] = CMD_M25PXX_PP;
		cmd[1] = page_addr >> 8;
		cmd[2] = page_addr;
		cmd[3] = byte_addr;

		debug
		    ("PP: 0x%p => cmd = { 0x%02x 0x%02x%02x%02x } chunk_len = %d\n",
		     buf + actual, cmd[0], cmd[1], cmd[2], cmd[3], chunk_len);

		ret = spi_flash_cmd(flash->spi, CMD_M25PXX_WREN, NULL, 0);
		if (ret < 0) {
			debug("SF: Enabling Write failed\n");
			break;
		}

		ret = spi_flash_cmd_write(flash->spi, cmd, 4,
					  buf + actual, chunk_len);
		if (ret < 0) {
			debug("SF: STMicro Page Program failed\n");
			break;
		}

		ret = stmicro_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT);
		if (ret < 0) {
			debug("SF: STMicro page programming timed out\n");
			break;
		}

		page_addr++;
		byte_addr = 0;
	}

	debug("SF: STMicro: Successfully programmed %u bytes @ 0x%x\n",
	      len, offset);

	spi_release_bus(flash->spi);
	return ret;
}

int stmicro_erase(struct spi_flash *flash, u32 offset, size_t len)
{
	struct stmicro_spi_flash *stm = to_stmicro_spi_flash(flash);
	unsigned long sector_size;
	size_t actual;
	int ret;
	u8 cmd[4];

	/*
	 * This function currently uses sector erase only.
	 * probably speed things up by using bulk erase
	 * when possible.
	 */

	sector_size = stm->params->page_size * stm->params->pages_per_sector;

	if (offset % sector_size || len % sector_size) {
		debug("SF: Erase offset/length not multiple of sector size\n");
		return -1;
	}

	len /= sector_size;
	cmd[0] = CMD_M25PXX_SE;
	cmd[2] = 0x00;
	cmd[3] = 0x00;

	ret = spi_claim_bus(flash->spi);
	if (ret) {
		debug("SF: Unable to claim SPI bus\n");
		return ret;
	}

	ret = 0;
	for (actual = 0; actual < len; actual++) {
		cmd[1] = (offset / sector_size) + actual;

		ret = spi_flash_cmd(flash->spi, CMD_M25PXX_WREN, NULL, 0);
		if (ret < 0) {
			debug("SF: Enabling Write failed\n");
			break;
		}

		ret = spi_flash_cmd_write(flash->spi, cmd, 4, NULL, 0);
		if (ret < 0) {
			debug("SF: STMicro page erase failed\n");
			break;
		}

		/* Up to 2 seconds */
		ret = stmicro_wait_ready(flash, 2 * CFG_HZ);
		if (ret < 0) {
			debug("SF: STMicro page erase timed out\n");
			break;
		}
	}

	debug("SF: STMicro: Successfully erased %u bytes @ 0x%x\n",
	      len * sector_size, offset);

	spi_release_bus(flash->spi);
	return ret;
}

struct spi_flash *spi_flash_probe_stmicro(struct spi_slave *spi, u8 * idcode)
{
	const struct stmicro_spi_flash_params *params;
	struct stmicro_spi_flash *stm;
	unsigned int i;
	int ret;
	u8 id[3];

	ret = spi_flash_cmd(spi, CMD_READ_ID, id, sizeof(id));
	if (ret)
		return NULL;

	for (i = 0; i < ARRAY_SIZE(stmicro_spi_flash_table); i++) {
		params = &stmicro_spi_flash_table[i];
		if (params->idcode1 == idcode[2]) {
			break;
		}
	}

	if (i == ARRAY_SIZE(stmicro_spi_flash_table)) {
		debug("SF: Unsupported STMicro ID %02x\n", id[1]);
		return NULL;
	}

	stm = malloc(sizeof(struct stmicro_spi_flash));
	if (!stm) {
		debug("SF: Failed to allocate memory\n");
		return NULL;
	}

	stm->params = params;
	stm->flash.spi = spi;
	stm->flash.name = params->name;

	stm->flash.write = stmicro_write;
	stm->flash.erase = stmicro_erase;
	stm->flash.read = stmicro_read_fast;
	stm->flash.size = params->page_size * params->pages_per_sector
	    * params->nr_sectors;

	debug("SF: Detected %s with page size %u, total %u bytes\n",
	      params->name, params->page_size, stm->flash.size);

	return &stm->flash;
}