summaryrefslogtreecommitdiff
path: root/board/funkwerk/vovpn-gw/flash.c
blob: 0308611eb6bee383d3efebc5d0b1938ab73c2ee4 (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
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
/*
 * (C) Copyright 2004
 * Elmeg Communications Systems GmbH, Juergen Selent (j.selent@elmeg.de)
 *
 * Support for the Elmeg VoVPN Gateway Module
 * ------------------------------------------
 * This is a signle bank flashdriver for INTEL 28F320J3, 28F640J3
 * and 28F128J3A flashs working in 8 Bit mode.
 *
 * Most of this code is taken from existing u-boot source code.
 *
 * 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>

flash_info_t				flash_info[CFG_MAX_FLASH_BANKS];

#define FLASH_CMD_READ_ID		0x90
#define FLASH_CMD_READ_STATUS		0x70
#define FLASH_CMD_RESET			0xff
#define FLASH_CMD_BLOCK_ERASE		0x20
#define FLASH_CMD_ERASE_CONFIRM		0xd0
#define FLASH_CMD_CLEAR_STATUS		0x50
#define FLASH_CMD_SUSPEND_ERASE		0xb0
#define FLASH_CMD_WRITE			0x40
#define FLASH_CMD_WRITE_BUFF		0xe8
#define FLASH_CMD_PROG_RESUME		0xd0
#define FLASH_CMD_PROTECT		0x60
#define FLASH_CMD_PROTECT_SET		0x01
#define FLASH_CMD_PROTECT_CLEAR		0xd0
#define FLASH_STATUS_DONE		0x80

#define FLASH_WRITE_BUFFER_SIZE		32

#ifdef CFG_FLASH_16BIT
#define FLASH_WORD_SIZE			unsigned short
#define FLASH_ID_MASK			0xffff
#define FLASH_CMD_ADDR_SHIFT		0
#else
#define FLASH_WORD_SIZE			unsigned char
#define FLASH_ID_MASK			0xff
/* A0 is not used in either 8x or 16x for READ ID */
#define FLASH_CMD_ADDR_SHIFT		1
#endif


static unsigned long
flash_get(volatile FLASH_WORD_SIZE *addr, flash_info_t *info)
{
	volatile FLASH_WORD_SIZE *p;
	FLASH_WORD_SIZE value;
	int i;

	addr[0] = FLASH_CMD_READ_ID;

	/* manufactor */
	value = addr[0 << FLASH_CMD_ADDR_SHIFT];
	switch (value) {
	case (INTEL_MANUFACT & FLASH_ID_MASK):
		info->flash_id = FLASH_MAN_INTEL;
		break;
	default:
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
		*addr = FLASH_CMD_RESET;
		return (0);

	}

	/* device */
	value = addr[1 << FLASH_CMD_ADDR_SHIFT];
	switch (value) {
	case (INTEL_ID_28F320J3A & FLASH_ID_MASK):
		info->flash_id += FLASH_28F320J3A;
		info->sector_count = 32;
		info->size = 0x00400000;
		break;
	case (INTEL_ID_28F640J3A & FLASH_ID_MASK):
		info->flash_id += FLASH_28F640J3A;
		info->sector_count = 64;
		info->size = 0x00800000;
		break;
	case (INTEL_ID_28F128J3A & FLASH_ID_MASK):
		info->flash_id += FLASH_28F128J3A;
		info->sector_count = 128;
		info->size = 0x01000000;
		break;
	default:
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
		*addr = FLASH_CMD_RESET;
		return (0);
	}

	/* setup sectors */
	for (i = 0; i < info->sector_count; i++) {
		info->start[i] = (unsigned long)addr + (i * info->size/info->sector_count);
	}

	/* check protected sectors */
	for (i = 0; i < info->sector_count; i++) {
		p = (volatile FLASH_WORD_SIZE *)(info->start[i]);
		info->protect[i] = p[2 << FLASH_CMD_ADDR_SHIFT] & 1;
	}

	/* reset bank */
	*addr = FLASH_CMD_RESET;
	return (info->size);
}

unsigned long
flash_init(void)
{
	unsigned long	size;
	int		i;

	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
		flash_info[i].flash_id = FLASH_UNKNOWN;
	}
	size = flash_get((volatile FLASH_WORD_SIZE *)CFG_FLASH_BASE, &flash_info[0]);
	if (flash_info[0].flash_id == FLASH_UNKNOWN) {
		printf ("## Unknown FLASH Size=0x%08lx\n", size);
		return (0);
	}

	/* always protect 1 sector containing the HRCW */
	flash_protect(FLAG_PROTECT_SET,
		      flash_info[0].start[0],
		      flash_info[0].start[1] - 1,
		      &flash_info[0]);

#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
	flash_protect(FLAG_PROTECT_SET,
		      CFG_MONITOR_FLASH,
		      CFG_MONITOR_FLASH+CFG_MONITOR_LEN-1,
		      &flash_info[0]);
#endif
#ifdef	CONFIG_ENV_IS_IN_FLASH
	flash_protect(FLAG_PROTECT_SET,
		      CONFIG_ENV_ADDR,
		      CONFIG_ENV_ADDR+CONFIG_ENV_SECT_SIZE-1,
		      &flash_info[0]);
#endif
	return (size);
}

void
flash_print_info(flash_info_t *info)
{
	int i;

	if (info->flash_id == FLASH_UNKNOWN) {
		printf ("missing or unknown FLASH type\n");
		return;
	}

	switch (info->flash_id & FLASH_VENDMASK) {
	case FLASH_MAN_INTEL:	printf ("INTEL ");		break;
	default:		printf ("Unknown Vendor ");	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_28F320J3A:	printf ("28F320JA3 (32 Mbit)\n");
				break;
	case FLASH_28F640J3A:	printf ("28F640JA3 (64 Mbit)\n");
				break;
	case FLASH_28F128J3A:	printf ("28F128JA3 (128 Mbit)\n");
				break;
	default:		printf ("Unknown Chip Type");
				break;
	}

	printf ("  Size: %ld MB in %d Sectors\n",
		info->size >> 20, info->sector_count);

	printf ("  Sector Start Addresses:");
	for (i=0; i<info->sector_count; ++i) {
		if ((i % 5) == 0)
			printf ("\n   ");
		printf (" %08lX%s",
			info->start[i],
			info->protect[i] ? " (RO)" : "     "
		);
	}
	printf ("\n");
}

int
flash_erase(flash_info_t *info, int s_first, int s_last)
{
	unsigned long start, now, last;
	int flag, prot, sect;
	volatile FLASH_WORD_SIZE *addr;
	FLASH_WORD_SIZE status;

	if ((s_first < 0) || (s_first > s_last)) {
		if (info->flash_id == FLASH_UNKNOWN) {
			printf ("- missing\n");
		} else {
			printf ("- no sectors to erase\n");
		}
		return (1);
	}

	if (info->flash_id == FLASH_UNKNOWN) {
		printf ("Cannot erase unknown flash - aborted\n");
		return (1);
	}

	prot = 0;
	for (sect=s_first; sect<=s_last; ++sect) {
		if (info->protect[sect]) {
			prot++;
		}
	}

	if (prot) {
		printf ("- Warning: %d protected sectors will not be erased!\n", prot);
	} else {
		printf ("\n");
	}

	start = get_timer (0);
	last  = start;

	for (sect = s_first; sect<=s_last; sect++) {
		if (info->protect[sect]) {
			continue;
		}

		addr = (volatile FLASH_WORD_SIZE *)(info->start[sect]);
		/* Disable interrupts which might cause a timeout here */
		flag = disable_interrupts();

#ifdef DEBUG
		printf("Erase sector %d at start addr 0x%08X", sect, (unsigned int)info->start[sect]);
#endif

		*addr = FLASH_CMD_CLEAR_STATUS;
		*addr = FLASH_CMD_BLOCK_ERASE;
		*addr = FLASH_CMD_ERASE_CONFIRM;

		/* re-enable interrupts if necessary */
		if (flag) {
			enable_interrupts();
		}

		/* wait at least 80us - let's wait 1 ms */
		udelay (1000);

		while (((status = *addr) & FLASH_STATUS_DONE) != FLASH_STATUS_DONE) {
			if ((now=get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
				printf("Flash erase timeout at address %lx\n", info->start[sect]);
				*addr = FLASH_CMD_SUSPEND_ERASE;
				*addr = FLASH_CMD_RESET;
				return (1);
			}

			/* show that we're waiting */
			if ((now - last) > 1000) {	/* every second */
				putc ('.');
				last = now;
			}
		}
		*addr = FLASH_CMD_RESET;
	}
	printf (" done\n");
	return (0);
}

static int
write_buff2( volatile FLASH_WORD_SIZE *dst,
	     volatile FLASH_WORD_SIZE *src,
	     unsigned long cnt )
{
	unsigned long start;
	FLASH_WORD_SIZE status;
	int flag, i;

	start = get_timer (0);
	while (1) {
		/* Disable interrupts which might cause a timeout here */
		flag = disable_interrupts();
		dst[0] = FLASH_CMD_WRITE_BUFF;
		if ((status = *dst) & FLASH_STATUS_DONE) {
			break;
		}

		/* re-enable interrupts if necessary */
		if (flag) {
			enable_interrupts();
		}

		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
			return (-1);
		}
	}
	dst[0] = (FLASH_WORD_SIZE)(cnt - 1);
	for (i=0; i<cnt; i++) {
		dst[i] = src[i];
	}
	dst[0] = FLASH_CMD_PROG_RESUME;

	if (flag) {
		enable_interrupts();
	}

	return( 0 );
}

static int
poll_status( volatile FLASH_WORD_SIZE *addr )
{
	unsigned long start;

	start = get_timer (0);
	/* wait for error or finish */
	while (1) {
		if (*addr == FLASH_STATUS_DONE) {
			if (*addr == FLASH_STATUS_DONE) {
				break;
			}
		}
		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
			*addr = FLASH_CMD_RESET;
			return (-1);
		}
	}
	*addr = FLASH_CMD_RESET;
	return (0);
}

/*
 * write_buff return values:
 * 0 - OK
 * 1 - write timeout
 * 2 - Flash not erased
 * 4 - Flash not identified
 */
int
write_buff(flash_info_t *info, uchar *src, ulong udst, ulong cnt)
{
	volatile FLASH_WORD_SIZE *addr, *dst;
	unsigned long bcnt;
	int flag, i;

	if (info->flash_id == FLASH_UNKNOWN) {
		return (4);
	}

	addr = (volatile FLASH_WORD_SIZE *)(info->start[0]);
	dst = (volatile FLASH_WORD_SIZE *) udst;

#ifdef CFG_FLASH_16BIT
#error NYI
#else
	while (cnt > 0) {
		/* Check if buffer write is possible */
		if (cnt > 1 && (((unsigned long)dst & (FLASH_WRITE_BUFFER_SIZE - 1)) == 0)) {
			bcnt = cnt > FLASH_WRITE_BUFFER_SIZE ? FLASH_WRITE_BUFFER_SIZE : cnt;
			/* Check if Flash is (sufficiently) erased */
			for (i=0; i<bcnt; i++) {
				if ((dst[i] & src[i]) != src[i]) {
					return (2);
				}
			}
			if (write_buff2( dst,src,bcnt ) != 0) {
				addr[0] = FLASH_CMD_READ_STATUS;
			}
			if (poll_status( dst ) != 0) {
				return (1);
			}
			cnt -= bcnt;
			dst += bcnt;
			src += bcnt;
			continue;
		}

		/* Check if Flash is (sufficiently) erased */
		if ((*dst & *src) != *src) {
			return (2);
		}

		/* Disable interrupts which might cause a timeout here */
		flag = disable_interrupts();
		addr[0] = FLASH_CMD_ERASE_CONFIRM;
		addr[0] = FLASH_CMD_WRITE;
		*dst++ = *src++;
		/* re-enable interrupts if necessary */
		if (flag) {
			enable_interrupts();
		}

		if (poll_status( dst ) != 0) {
			return (1);
		}
		cnt --;
	}
#endif
	return (0);
}

int
flash_real_protect(flash_info_t *info, long sector, int prot)
{
	volatile FLASH_WORD_SIZE *addr;
	unsigned long start;

	addr = (volatile FLASH_WORD_SIZE *)(info->start[sector]);
	*addr = FLASH_CMD_CLEAR_STATUS;
	*addr = FLASH_CMD_PROTECT;

	if(prot) {
		*addr = FLASH_CMD_PROTECT_SET;
	} else {
		*addr = FLASH_CMD_PROTECT_CLEAR;
	}

	/* wait for error or finish */
	start = get_timer (0);
	while(!(addr[0] & FLASH_STATUS_DONE)){
		if (get_timer(start) > CFG_FLASH_ERASE_TOUT) {
			printf("Flash protect timeout at address %lx\n",  info->start[sector]);
			addr[0] = FLASH_CMD_RESET;
			return (1);
		}
	}

	/* Set software protect flag */
	info->protect[sector] = prot;
	*addr = FLASH_CMD_RESET;
	return (0);
}