summaryrefslogtreecommitdiff
path: root/arch/nios2/cpu/epcs.c
blob: 9758552447babf08023e5f584033271b17031a4f (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
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
/*
 * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
 * Scott McNutt <smcnutt@psyent.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>

#if defined(CONFIG_SYS_NIOS_EPCSBASE)
#include <command.h>
#include <asm/io.h>
#include <nios2-io.h>
#include <nios2-epcs.h>


/*-----------------------------------------------------------------------*/
#define SHORT_HELP\
	"epcs    - read/write Cyclone EPCS configuration device.\n"

#define LONG_HELP\
	"\n"\
	"epcs erase start [end]\n"\
	"    - erase sector start or sectors start through end.\n"\
	"epcs info\n"\
	"    - display EPCS device information.\n"\
	"epcs protect on | off\n"\
	"    - turn device protection on or off.\n"\
	"epcs read addr offset count\n"\
	"    - read count bytes from offset to addr.\n"\
	"epcs write addr offset count\n"\
	"    - write count bytes to offset from addr.\n"\
	"epcs verify addr offset count\n"\
	"    - verify count bytes at offset from addr."


/*-----------------------------------------------------------------------*/
/* Operation codes for serial configuration devices
 */
#define EPCS_WRITE_ENA		0x06	/* Write enable */
#define EPCS_WRITE_DIS		0x04	/* Write disable */
#define EPCS_READ_STAT		0x05	/* Read status */
#define EPCS_READ_BYTES		0x03	/* Read bytes */
#define EPCS_READ_ID		0xab	/* Read silicon id */
#define EPCS_WRITE_STAT		0x01	/* Write status */
#define EPCS_WRITE_BYTES	0x02	/* Write bytes */
#define EPCS_ERASE_BULK		0xc7	/* Erase entire device */
#define EPCS_ERASE_SECT		0xd8	/* Erase sector */

/* Device status register bits
 */
#define EPCS_STATUS_WIP		(1<<0)	/* Write in progress */
#define EPCS_STATUS_WEL		(1<<1)	/* Write enable latch */

/* Misc
 */
#define EPCS_TIMEOUT		100	/* 100 msec timeout */

static nios_spi_t *epcs = (nios_spi_t *)CONFIG_SYS_NIOS_EPCSBASE;

/***********************************************************************
 * Device access
 ***********************************************************************/
static int epcs_cs (int assert)
{
	ulong start;
	unsigned tmp;


	if (assert) {
		tmp = readl (&epcs->control);
		writel (tmp | NIOS_SPI_SSO, &epcs->control);
	} else {
		/* Let all bits shift out */
		start = get_timer (0);
		while ((readl (&epcs->status) & NIOS_SPI_TMT) == 0)
			if (get_timer (start) > EPCS_TIMEOUT)
				return (-1);
		tmp = readl (&epcs->control);
		writel (tmp & ~NIOS_SPI_SSO, &epcs->control);
	}
	return (0);
}

static int epcs_tx (unsigned char c)
{
	ulong start;

	start = get_timer (0);
	while ((readl (&epcs->status) & NIOS_SPI_TRDY) == 0)
		if (get_timer (start) > EPCS_TIMEOUT)
			return (-1);
	writel (c, &epcs->txdata);
	return (0);
}

static int epcs_rx (void)
{
	ulong start;

	start = get_timer (0);
	while ((readl (&epcs->status) & NIOS_SPI_RRDY) == 0)
		if (get_timer (start) > EPCS_TIMEOUT)
			return (-1);
	return (readl (&epcs->rxdata));
}

static unsigned char bitrev[] = {
	0x00, 0x08, 0x04, 0x0c, 0x02, 0x0a, 0x06, 0x0e,
	0x01, 0x09, 0x05, 0x0d, 0x03, 0x0b, 0x07, 0x0f
};

static unsigned char epcs_bitrev (unsigned char c)
{
	unsigned char val;

	val  = bitrev[c>>4];
	val |= bitrev[c & 0x0f]<<4;
	return (val);
}

static void epcs_rcv (unsigned char *dst, int len)
{
	while (len--) {
		epcs_tx (0);
		*dst++ = epcs_rx ();
	}
}

static void epcs_rrcv (unsigned char *dst, int len)
{
	while (len--) {
		epcs_tx (0);
		*dst++ = epcs_bitrev (epcs_rx ());
	}
}

static void epcs_snd (unsigned char *src, int len)
{
	while (len--) {
		epcs_tx (*src++);
		epcs_rx ();
	}
}

static void epcs_rsnd (unsigned char *src, int len)
{
	while (len--) {
		epcs_tx (epcs_bitrev (*src++));
		epcs_rx ();
	}
}

static void epcs_wr_enable (void)
{
	epcs_cs (1);
	epcs_tx (EPCS_WRITE_ENA);
	epcs_rx ();
	epcs_cs (0);
}

static unsigned char epcs_status_rd (void)
{
	unsigned char status;

	epcs_cs (1);
	epcs_tx (EPCS_READ_STAT);
	epcs_rx ();
	epcs_tx (0);
	status = epcs_rx ();
	epcs_cs (0);
	return (status);
}

static void epcs_status_wr (unsigned char status)
{
	epcs_wr_enable ();
	epcs_cs (1);
	epcs_tx (EPCS_WRITE_STAT);
	epcs_rx ();
	epcs_tx (status);
	epcs_rx ();
	epcs_cs (0);
	return;
}

/***********************************************************************
 * Device information
 ***********************************************************************/

static struct epcs_devinfo_t devinfo[] = {
	{ "EPCS1 ", 0x10, 17, 4, 15, 8, 0x0c },
	{ "EPCS4 ", 0x12, 19, 8, 16, 8, 0x1c },
	{ "EPCS16", 0x14, 21, 32, 16, 8, 0x1c },
	{ "EPCS64", 0x16, 23,128, 16, 8, 0x1c },
	{ 0, 0, 0, 0, 0, 0 }
};

int epcs_reset (void)
{
	/* When booting from an epcs controller, the epcs bootrom
	 * code may leave the slave select in an asserted state.
	 * This causes two problems: (1) The initial epcs access
	 * will fail -- not a big deal, and (2) a software reset
	 * will cause the bootrom code to hang since it does not
	 * ensure the select is negated prior to first access -- a
	 * big deal. Here we just negate chip select and everything
	 * gets better :-)
	 */
	epcs_cs (0); /* Negate chip select */
	return (0);
}

epcs_devinfo_t *epcs_dev_find (void)
{
	unsigned char buf[4];
	unsigned char id;
	int i;
	struct epcs_devinfo_t *dev = NULL;

	/* Read silicon id requires 3 "dummy bytes" before it's put
	 * on the wire.
	 */
	buf[0] = EPCS_READ_ID;
	buf[1] = 0;
	buf[2] = 0;
	buf[3] = 0;

	epcs_cs (1);
	epcs_snd (buf,4);
	epcs_rcv (buf,1);
	if (epcs_cs (0) == -1)
		return (NULL);
	id = buf[0];

	/* Find the info struct */
	i = 0;
	while (devinfo[i].name) {
		if (id == devinfo[i].id) {
			dev = &devinfo[i];
			break;
		}
		i++;
	}

	return (dev);
}

/***********************************************************************
 * Misc Utilities
 ***********************************************************************/
int epcs_cfgsz (void)
{
	int sz = 0;
	unsigned char buf[128];
	unsigned char *p;
	struct epcs_devinfo_t *dev = epcs_dev_find ();

	if (!dev)
		return (-1);

	/* Read in the first 128 bytes of the device */
	buf[0] = EPCS_READ_BYTES;
	buf[1] = 0;
	buf[2] = 0;
	buf[3] = 0;

	epcs_cs (1);
	epcs_snd (buf,4);
	epcs_rrcv (buf, sizeof(buf));
	epcs_cs (0);

	/* Search for the starting 0x6a which is followed by the
	 * 4-byte 'register' and 4-byte bit-count.
	 */
	p = buf;
	while (p < buf + sizeof(buf)-8) {
		if ( *p == 0x6a ) {
			/* Point to bit count and extract */
			p += 5;
			sz = *p++;
			sz |= *p++ << 8;
			sz |= *p++ << 16;
			sz |= *p++ << 24;
			/* Convert to byte count */
			sz += 7;
			sz >>= 3;
		} else if (*p == 0xff) {
			/* 0xff is ok ... just skip */
			p++;
			continue;
		} else {
			/* Not 0xff or 0x6a ... something's not
			 * right ... report 'unknown' (sz=0).
			 */
			break;
		}
	}
	return (sz);
}

int epcs_erase (unsigned start, unsigned end)
{
	unsigned off, sectsz;
	unsigned char buf[4];
	struct epcs_devinfo_t *dev = epcs_dev_find ();

	if (!dev || (start>end))
		return (-1);

	/* Erase the requested sectors. An address is required
	 * that lies within the requested sector -- we'll just
	 * use the first address in the sector.
	 */
	printf ("epcs erasing sector %d ", start);
	if (start != end)
		printf ("to %d ", end);
	sectsz = (1 << dev->sz_sect);
	while (start <= end) {
		off = start * sectsz;
		start++;

		buf[0] = EPCS_ERASE_SECT;
		buf[1] = off >> 16;
		buf[2] = off >> 8;
		buf[3] = off;

		epcs_wr_enable ();
		epcs_cs (1);
		epcs_snd (buf,4);
		epcs_cs (0);

		printf ("."); /* Some user feedback */

		/* Wait for erase to complete */
		while (epcs_status_rd() & EPCS_STATUS_WIP)
			;
	}
	printf (" done.\n");
	return (0);
}

int epcs_read (ulong addr, ulong off, ulong cnt)
{
	unsigned char buf[4];
	struct epcs_devinfo_t *dev = epcs_dev_find ();

	if (!dev)
		return (-1);

	buf[0] = EPCS_READ_BYTES;
	buf[1] = off >> 16;
	buf[2] = off >> 8;
	buf[3] = off;

	epcs_cs (1);
	epcs_snd (buf,4);
	epcs_rrcv ((unsigned char *)addr, cnt);
	epcs_cs (0);

	return (0);
}

int epcs_write (ulong addr, ulong off, ulong cnt)
{
	ulong wrcnt;
	unsigned pgsz;
	unsigned char buf[4];
	struct epcs_devinfo_t *dev = epcs_dev_find ();

	if (!dev)
		return (-1);

	pgsz = (1<<dev->sz_page);
	while (cnt) {
		if (off % pgsz)
			wrcnt = pgsz - (off % pgsz);
		else
			wrcnt = pgsz;
		wrcnt = (wrcnt > cnt) ? cnt : wrcnt;

		buf[0] = EPCS_WRITE_BYTES;
		buf[1] = off >> 16;
		buf[2] = off >> 8;
		buf[3] = off;

		epcs_wr_enable ();
		epcs_cs (1);
		epcs_snd (buf,4);
		epcs_rsnd ((unsigned char *)addr, wrcnt);
		epcs_cs (0);

		/* Wait for write to complete */
		while (epcs_status_rd() & EPCS_STATUS_WIP)
			;

		cnt -= wrcnt;
		off += wrcnt;
		addr += wrcnt;
	}

	return (0);
}

int epcs_verify (ulong addr, ulong off, ulong cnt, ulong *err)
{
	ulong rdcnt;
	unsigned char buf[256];
	unsigned char *start,*end;
	int i;

	start = end = (unsigned char *)addr;
	while (cnt) {
		rdcnt = (cnt>sizeof(buf)) ? sizeof(buf) : cnt;
		epcs_read ((ulong)buf, off, rdcnt);
		for (i=0; i<rdcnt; i++) {
			if (*end != buf[i]) {
				*err = end - start;
				return(-1);
			}
			end++;
		}
		cnt -= rdcnt;
		off += rdcnt;
	}
	return (0);
}

static int epcs_sect_erased (int sect, unsigned *offset,
		struct epcs_devinfo_t *dev)
{
	unsigned char buf[128];
	unsigned off, end;
	unsigned sectsz;
	int i;

	sectsz = (1 << dev->sz_sect);
	off = sectsz * sect;
	end = off + sectsz;

	while (off < end) {
		epcs_read ((ulong)buf, off, sizeof(buf));
		for (i=0; i < sizeof(buf); i++) {
			if (buf[i] != 0xff) {
				*offset = off + i;
				return (0);
			}
		}
		off += sizeof(buf);
	}
	return (1);
}


/***********************************************************************
 * Commands
 ***********************************************************************/
static
void do_epcs_info (struct epcs_devinfo_t *dev, int argc, char * const argv[])
{
	int i;
	unsigned char stat;
	unsigned tmp;
	int erased;

	/* Basic device info */
	printf ("%s: %d kbytes (%d sectors x %d kbytes,"
		" %d bytes/page)\n",
		dev->name, 1 << (dev->size-10),
		dev->num_sects, 1 << (dev->sz_sect-10),
		1 << dev->sz_page );

	/* Status -- for now protection is all-or-nothing */
	stat = epcs_status_rd();
	printf ("status: 0x%02x (WIP:%d, WEL:%d, PROT:%s)\n",
		stat,
		(stat & EPCS_STATUS_WIP) ? 1 : 0,
		(stat & EPCS_STATUS_WEL) ? 1 : 0,
		(stat & dev->prot_mask) ? "on" : "off" );

	/* Configuration  */
	tmp = epcs_cfgsz ();
	if (tmp) {
		printf ("config: 0x%06x (%d) bytes\n", tmp, tmp );
	} else {
		printf ("config: unknown\n" );
	}

	/* Sector info */
	for (i=0; (i < dev->num_sects) && (argc > 1); i++) {
		erased = epcs_sect_erased (i, &tmp, dev);
		if ((i & 0x03) == 0) printf ("\n");
		printf ("%4d: %07x ",
			i, i*(1<<dev->sz_sect) );
		if (erased)
			printf ("E ");
		else
			printf ("  ");
	}
	printf ("\n");

	return;
}

static
void do_epcs_erase (struct epcs_devinfo_t *dev, int argc, char * const argv[])
{
	unsigned start,end;

	if ((argc < 3) || (argc > 4)) {
		printf ("USAGE: epcs erase sect [end]\n");
		return;
	}
	if ((epcs_status_rd() & dev->prot_mask) != 0) {
		printf ( "epcs: device protected.\n");
		return;
	}

	start = simple_strtoul (argv[2], NULL, 10);
	if (argc > 3)
		end = simple_strtoul (argv[3], NULL, 10);
	else
		end = start;
	if ((start >= dev->num_sects) || (start > end)) {
		printf ("epcs: invalid sector range: [%d:%d]\n",
			start, end );
		return;
	}

	epcs_erase (start, end);

	return;
}

static
void do_epcs_protect (struct epcs_devinfo_t *dev, int argc, char * const argv[])
{
	unsigned char stat;

	/* For now protection is all-or-nothing to keep things
	 * simple. The protection bits don't map in a linear
	 * fashion ... and we would rather protect the bottom
	 * of the device since it contains the config data and
	 * leave the top unprotected for app use. But unfortunately
	 * protection works from top-to-bottom so it does
	 * really help very much from a software app point-of-view.
	 */
	if (argc < 3) {
		printf ("USAGE: epcs protect on | off\n");
		return;
	}
	if (!dev)
		return;

	/* Protection on/off is just a matter of setting/clearing
	 * all protection bits in the status register.
	 */
	stat = epcs_status_rd ();
	if (strcmp ("on", argv[2]) == 0) {
		stat |= dev->prot_mask;
	} else if (strcmp ("off", argv[2]) == 0 ) {
		stat &= ~dev->prot_mask;
	} else {
		printf ("epcs: unknown protection: %s\n", argv[2]);
		return;
	}
	epcs_status_wr (stat);
	return;
}

static
void do_epcs_read (struct epcs_devinfo_t *dev, int argc, char * const argv[])
{
	ulong addr,off,cnt;
	ulong sz;

	if (argc < 5) {
		printf ("USAGE: epcs read addr offset count\n");
		return;
	}

	sz = 1 << dev->size;
	addr = simple_strtoul (argv[2], NULL, 16);
	off  = simple_strtoul (argv[3], NULL, 16);
	cnt  = simple_strtoul (argv[4], NULL, 16);
	if (off > sz) {
		printf ("offset is greater than device size"
			"... aborting.\n");
		return;
	}
	if ((off + cnt) > sz) {
		printf ("request exceeds device size"
			"... truncating.\n");
		cnt = sz - off;
	}
	printf ("epcs: read %08lx <- %06lx (0x%lx bytes)\n",
			addr, off, cnt);
	epcs_read (addr, off, cnt);

	return;
}

static
void do_epcs_write (struct epcs_devinfo_t *dev, int argc, char * const argv[])
{
	ulong addr,off,cnt;
	ulong sz;
	ulong err;

	if (argc < 5) {
		printf ("USAGE: epcs write addr offset count\n");
		return;
	}
	if ((epcs_status_rd() & dev->prot_mask) != 0) {
		printf ( "epcs: device protected.\n");
		return;
	}

	sz = 1 << dev->size;
	addr = simple_strtoul (argv[2], NULL, 16);
	off  = simple_strtoul (argv[3], NULL, 16);
	cnt  = simple_strtoul (argv[4], NULL, 16);
	if (off > sz) {
		printf ("offset is greater than device size"
			"... aborting.\n");
		return;
	}
	if ((off + cnt) > sz) {
		printf ("request exceeds device size"
			"... truncating.\n");
		cnt = sz - off;
	}
	printf ("epcs: write %08lx -> %06lx (0x%lx bytes)\n",
			addr, off, cnt);
	epcs_write (addr, off, cnt);
	if (epcs_verify (addr, off, cnt, &err) != 0)
		printf ("epcs: write error at offset %06lx\n", err);

	return;
}

static
void do_epcs_verify (struct epcs_devinfo_t *dev, int argc, char * const argv[])
{
	ulong addr,off,cnt;
	ulong sz;
	ulong err;

	if (argc < 5) {
		printf ("USAGE: epcs verify addr offset count\n");
		return;
	}

	sz = 1 << dev->size;
	addr = simple_strtoul (argv[2], NULL, 16);
	off  = simple_strtoul (argv[3], NULL, 16);
	cnt  = simple_strtoul (argv[4], NULL, 16);
	if (off > sz) {
		printf ("offset is greater than device size"
			"... aborting.\n");
		return;
	}
	if ((off + cnt) > sz) {
		printf ("request exceeds device size"
			"... truncating.\n");
		cnt = sz - off;
	}
	printf ("epcs: verify %08lx -> %06lx (0x%lx bytes)\n",
			addr, off, cnt);
	if (epcs_verify (addr, off, cnt, &err) != 0)
		printf ("epcs: verify error at offset %06lx\n", err);

	return;
}

/*-----------------------------------------------------------------------*/
int do_epcs (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	int len;
	struct epcs_devinfo_t *dev = epcs_dev_find ();

	if (!dev) {
		printf ("epcs: device not found.\n");
		return (-1);
	}

	if (argc < 2) {
		do_epcs_info (dev, argc, argv);
		return (0);
	}

	len = strlen (argv[1]);
	if (strncmp ("info", argv[1], len) == 0) {
		do_epcs_info (dev, argc, argv);
	} else if (strncmp ("erase", argv[1], len) == 0) {
		do_epcs_erase (dev, argc, argv);
	} else if (strncmp ("protect", argv[1], len) == 0) {
		do_epcs_protect (dev, argc, argv);
	} else if (strncmp ("read", argv[1], len) == 0) {
		do_epcs_read (dev, argc, argv);
	} else if (strncmp ("write", argv[1], len) == 0) {
		do_epcs_write (dev, argc, argv);
	} else if (strncmp ("verify", argv[1], len) == 0) {
		do_epcs_verify (dev, argc, argv);
	} else {
		printf ("epcs: unknown operation: %s\n", argv[1]);
	}

	return (0);
}

/*-----------------------------------------------------------------------*/


U_BOOT_CMD( epcs, 5, 0, do_epcs, SHORT_HELP, LONG_HELP );

#endif /* CONFIG_NIOS_EPCS */