summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/sym53c8xx_2/sym_nvram.c
blob: 15d69298ab6ec9668e14bc83a091c15eb17e53f1 (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
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
/*
 * Device driver for the SYMBIOS/LSILOGIC 53C8XX and 53C1010 family 
 * of PCI-SCSI IO processors.
 *
 * Copyright (C) 1999-2001  Gerard Roudier <groudier@free.fr>
 *
 * This driver is derived from the Linux sym53c8xx driver.
 * Copyright (C) 1998-2000  Gerard Roudier
 *
 * The sym53c8xx driver is derived from the ncr53c8xx driver that had been 
 * a port of the FreeBSD ncr driver to Linux-1.2.13.
 *
 * The original ncr driver has been written for 386bsd and FreeBSD by
 *         Wolfgang Stanglmeier        <wolf@cologne.de>
 *         Stefan Esser                <se@mi.Uni-Koeln.de>
 * Copyright (C) 1994  Wolfgang Stanglmeier
 *
 * Other major contributions:
 *
 * NVRAM detection and reading.
 * Copyright (C) 1997 Richard Waltham <dormouse@farsrobt.demon.co.uk>
 *
 *-----------------------------------------------------------------------------
 *
 * 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 "sym_glue.h"
#include "sym_nvram.h"

#ifdef	SYM_CONF_DEBUG_NVRAM
static u_char Tekram_boot_delay[7] = {3, 5, 10, 20, 30, 60, 120};
#endif

/*
 *  Get host setup from NVRAM.
 */
void sym_nvram_setup_host(struct Scsi_Host *shost, struct sym_hcb *np, struct sym_nvram *nvram)
{
	/*
	 *  Get parity checking, host ID, verbose mode 
	 *  and miscellaneous host flags from NVRAM.
	 */
	switch (nvram->type) {
	case SYM_SYMBIOS_NVRAM:
		if (!(nvram->data.Symbios.flags & SYMBIOS_PARITY_ENABLE))
			np->rv_scntl0  &= ~0x0a;
		np->myaddr = nvram->data.Symbios.host_id & 0x0f;
		if (nvram->data.Symbios.flags & SYMBIOS_VERBOSE_MSGS)
			np->verbose += 1;
		if (nvram->data.Symbios.flags1 & SYMBIOS_SCAN_HI_LO)
			shost->reverse_ordering = 1;
		if (nvram->data.Symbios.flags2 & SYMBIOS_AVOID_BUS_RESET)
			np->usrflags |= SYM_AVOID_BUS_RESET;
		break;
	case SYM_TEKRAM_NVRAM:
		np->myaddr = nvram->data.Tekram.host_id & 0x0f;
		break;
#ifdef CONFIG_PARISC
	case SYM_PARISC_PDC:
		if (nvram->data.parisc.host_id != -1)
			np->myaddr = nvram->data.parisc.host_id;
		if (nvram->data.parisc.factor != -1)
			np->minsync = nvram->data.parisc.factor;
		if (nvram->data.parisc.width != -1)
			np->maxwide = nvram->data.parisc.width;
		switch (nvram->data.parisc.mode) {
			case 0: np->scsi_mode = SMODE_SE; break;
			case 1: np->scsi_mode = SMODE_HVD; break;
			case 2: np->scsi_mode = SMODE_LVD; break;
			default: break;
		}
#endif
	default:
		break;
	}
}

/*
 *  Get target set-up from Symbios format NVRAM.
 */
static void
sym_Symbios_setup_target(struct sym_tcb *tp, int target, Symbios_nvram *nvram)
{
	Symbios_target *tn = &nvram->target[target];

	if (!(tn->flags & SYMBIOS_QUEUE_TAGS_ENABLED))
		tp->usrtags = 0;
	if (!(tn->flags & SYMBIOS_DISCONNECT_ENABLE))
		tp->usrflags &= ~SYM_DISC_ENABLED;
	if (!(tn->flags & SYMBIOS_SCAN_AT_BOOT_TIME))
		tp->usrflags |= SYM_SCAN_BOOT_DISABLED;
	if (!(tn->flags & SYMBIOS_SCAN_LUNS))
		tp->usrflags |= SYM_SCAN_LUNS_DISABLED;
	tp->usr_period = (tn->sync_period + 3) / 4;
	tp->usr_width = (tn->bus_width == 0x8) ? 0 : 1;
}

static const unsigned char Tekram_sync[16] = {
	25, 31, 37, 43, 50, 62, 75, 125, 12, 15, 18, 21, 6, 7, 9, 10
};

/*
 *  Get target set-up from Tekram format NVRAM.
 */
static void
sym_Tekram_setup_target(struct sym_tcb *tp, int target, Tekram_nvram *nvram)
{
	struct Tekram_target *tn = &nvram->target[target];

	if (tn->flags & TEKRAM_TAGGED_COMMANDS) {
		tp->usrtags = 2 << nvram->max_tags_index;
	}

	if (tn->flags & TEKRAM_DISCONNECT_ENABLE)
		tp->usrflags |= SYM_DISC_ENABLED;
 
	if (tn->flags & TEKRAM_SYNC_NEGO)
		tp->usr_period = Tekram_sync[tn->sync_index & 0xf];
	tp->usr_width = (tn->flags & TEKRAM_WIDE_NEGO) ? 1 : 0;
}

/*
 *  Get target setup from NVRAM.
 */
void sym_nvram_setup_target(struct sym_tcb *tp, int target, struct sym_nvram *nvp)
{
	switch (nvp->type) {
	case SYM_SYMBIOS_NVRAM:
		sym_Symbios_setup_target(tp, target, &nvp->data.Symbios);
		break;
	case SYM_TEKRAM_NVRAM:
		sym_Tekram_setup_target(tp, target, &nvp->data.Tekram);
		break;
	default:
		break;
	}
}

#ifdef	SYM_CONF_DEBUG_NVRAM
/*
 *  Dump Symbios format NVRAM for debugging purpose.
 */
static void sym_display_Symbios_nvram(struct sym_device *np, Symbios_nvram *nvram)
{
	int i;

	/* display Symbios nvram host data */
	printf("%s: HOST ID=%d%s%s%s%s%s%s\n",
		sym_name(np), nvram->host_id & 0x0f,
		(nvram->flags  & SYMBIOS_SCAM_ENABLE)	? " SCAM"	:"",
		(nvram->flags  & SYMBIOS_PARITY_ENABLE)	? " PARITY"	:"",
		(nvram->flags  & SYMBIOS_VERBOSE_MSGS)	? " VERBOSE"	:"", 
		(nvram->flags  & SYMBIOS_CHS_MAPPING)	? " CHS_ALT"	:"", 
		(nvram->flags2 & SYMBIOS_AVOID_BUS_RESET)?" NO_RESET"	:"",
		(nvram->flags1 & SYMBIOS_SCAN_HI_LO)	? " HI_LO"	:"");

	/* display Symbios nvram drive data */
	for (i = 0 ; i < 15 ; i++) {
		struct Symbios_target *tn = &nvram->target[i];
		printf("%s-%d:%s%s%s%s WIDTH=%d SYNC=%d TMO=%d\n",
		sym_name(np), i,
		(tn->flags & SYMBIOS_DISCONNECT_ENABLE)	? " DISC"	: "",
		(tn->flags & SYMBIOS_SCAN_AT_BOOT_TIME)	? " SCAN_BOOT"	: "",
		(tn->flags & SYMBIOS_SCAN_LUNS)		? " SCAN_LUNS"	: "",
		(tn->flags & SYMBIOS_QUEUE_TAGS_ENABLED)? " TCQ"	: "",
		tn->bus_width,
		tn->sync_period / 4,
		tn->timeout);
	}
}

/*
 *  Dump TEKRAM format NVRAM for debugging purpose.
 */
static void sym_display_Tekram_nvram(struct sym_device *np, Tekram_nvram *nvram)
{
	int i, tags, boot_delay;
	char *rem;

	/* display Tekram nvram host data */
	tags = 2 << nvram->max_tags_index;
	boot_delay = 0;
	if (nvram->boot_delay_index < 6)
		boot_delay = Tekram_boot_delay[nvram->boot_delay_index];
	switch ((nvram->flags & TEKRAM_REMOVABLE_FLAGS) >> 6) {
	default:
	case 0:	rem = "";			break;
	case 1: rem = " REMOVABLE=boot device";	break;
	case 2: rem = " REMOVABLE=all";		break;
	}

	printf("%s: HOST ID=%d%s%s%s%s%s%s%s%s%s BOOT DELAY=%d tags=%d\n",
		sym_name(np), nvram->host_id & 0x0f,
		(nvram->flags1 & SYMBIOS_SCAM_ENABLE)	? " SCAM"	:"",
		(nvram->flags & TEKRAM_MORE_THAN_2_DRIVES) ? " >2DRIVES":"",
		(nvram->flags & TEKRAM_DRIVES_SUP_1GB)	? " >1GB"	:"",
		(nvram->flags & TEKRAM_RESET_ON_POWER_ON) ? " RESET"	:"",
		(nvram->flags & TEKRAM_ACTIVE_NEGATION)	? " ACT_NEG"	:"",
		(nvram->flags & TEKRAM_IMMEDIATE_SEEK)	? " IMM_SEEK"	:"",
		(nvram->flags & TEKRAM_SCAN_LUNS)	? " SCAN_LUNS"	:"",
		(nvram->flags1 & TEKRAM_F2_F6_ENABLED)	? " F2_F6"	:"",
		rem, boot_delay, tags);

	/* display Tekram nvram drive data */
	for (i = 0; i <= 15; i++) {
		int sync, j;
		struct Tekram_target *tn = &nvram->target[i];
		j = tn->sync_index & 0xf;
		sync = Tekram_sync[j];
		printf("%s-%d:%s%s%s%s%s%s PERIOD=%d\n",
		sym_name(np), i,
		(tn->flags & TEKRAM_PARITY_CHECK)	? " PARITY"	: "",
		(tn->flags & TEKRAM_SYNC_NEGO)		? " SYNC"	: "",
		(tn->flags & TEKRAM_DISCONNECT_ENABLE)	? " DISC"	: "",
		(tn->flags & TEKRAM_START_CMD)		? " START"	: "",
		(tn->flags & TEKRAM_TAGGED_COMMANDS)	? " TCQ"	: "",
		(tn->flags & TEKRAM_WIDE_NEGO)		? " WIDE"	: "",
		sync);
	}
}
#else
static void sym_display_Symbios_nvram(struct sym_device *np, Symbios_nvram *nvram) { (void)np; (void)nvram; }
static void sym_display_Tekram_nvram(struct sym_device *np, Tekram_nvram *nvram) { (void)np; (void)nvram; }
#endif	/* SYM_CONF_DEBUG_NVRAM */


/*
 *  24C16 EEPROM reading.
 *
 *  GPOI0 - data in/data out
 *  GPIO1 - clock
 *  Symbios NVRAM wiring now also used by Tekram.
 */

#define SET_BIT 0
#define CLR_BIT 1
#define SET_CLK 2
#define CLR_CLK 3

/*
 *  Set/clear data/clock bit in GPIO0
 */
static void S24C16_set_bit(struct sym_device *np, u_char write_bit, u_char *gpreg, 
			  int bit_mode)
{
	udelay(5);
	switch (bit_mode) {
	case SET_BIT:
		*gpreg |= write_bit;
		break;
	case CLR_BIT:
		*gpreg &= 0xfe;
		break;
	case SET_CLK:
		*gpreg |= 0x02;
		break;
	case CLR_CLK:
		*gpreg &= 0xfd;
		break;

	}
	OUTB(np, nc_gpreg, *gpreg);
	INB(np, nc_mbox1);
	udelay(5);
}

/*
 *  Send START condition to NVRAM to wake it up.
 */
static void S24C16_start(struct sym_device *np, u_char *gpreg)
{
	S24C16_set_bit(np, 1, gpreg, SET_BIT);
	S24C16_set_bit(np, 0, gpreg, SET_CLK);
	S24C16_set_bit(np, 0, gpreg, CLR_BIT);
	S24C16_set_bit(np, 0, gpreg, CLR_CLK);
}

/*
 *  Send STOP condition to NVRAM - puts NVRAM to sleep... ZZzzzz!!
 */
static void S24C16_stop(struct sym_device *np, u_char *gpreg)
{
	S24C16_set_bit(np, 0, gpreg, SET_CLK);
	S24C16_set_bit(np, 1, gpreg, SET_BIT);
}

/*
 *  Read or write a bit to the NVRAM,
 *  read if GPIO0 input else write if GPIO0 output
 */
static void S24C16_do_bit(struct sym_device *np, u_char *read_bit, u_char write_bit, 
			 u_char *gpreg)
{
	S24C16_set_bit(np, write_bit, gpreg, SET_BIT);
	S24C16_set_bit(np, 0, gpreg, SET_CLK);
	if (read_bit)
		*read_bit = INB(np, nc_gpreg);
	S24C16_set_bit(np, 0, gpreg, CLR_CLK);
	S24C16_set_bit(np, 0, gpreg, CLR_BIT);
}

/*
 *  Output an ACK to the NVRAM after reading,
 *  change GPIO0 to output and when done back to an input
 */
static void S24C16_write_ack(struct sym_device *np, u_char write_bit, u_char *gpreg, 
			    u_char *gpcntl)
{
	OUTB(np, nc_gpcntl, *gpcntl & 0xfe);
	S24C16_do_bit(np, NULL, write_bit, gpreg);
	OUTB(np, nc_gpcntl, *gpcntl);
}

/*
 *  Input an ACK from NVRAM after writing,
 *  change GPIO0 to input and when done back to an output
 */
static void S24C16_read_ack(struct sym_device *np, u_char *read_bit, u_char *gpreg, 
			   u_char *gpcntl)
{
	OUTB(np, nc_gpcntl, *gpcntl | 0x01);
	S24C16_do_bit(np, read_bit, 1, gpreg);
	OUTB(np, nc_gpcntl, *gpcntl);
}

/*
 *  WRITE a byte to the NVRAM and then get an ACK to see it was accepted OK,
 *  GPIO0 must already be set as an output
 */
static void S24C16_write_byte(struct sym_device *np, u_char *ack_data, u_char write_data, 
			     u_char *gpreg, u_char *gpcntl)
{
	int x;
	
	for (x = 0; x < 8; x++)
		S24C16_do_bit(np, NULL, (write_data >> (7 - x)) & 0x01, gpreg);
		
	S24C16_read_ack(np, ack_data, gpreg, gpcntl);
}

/*
 *  READ a byte from the NVRAM and then send an ACK to say we have got it,
 *  GPIO0 must already be set as an input
 */
static void S24C16_read_byte(struct sym_device *np, u_char *read_data, u_char ack_data, 
			    u_char *gpreg, u_char *gpcntl)
{
	int x;
	u_char read_bit;

	*read_data = 0;
	for (x = 0; x < 8; x++) {
		S24C16_do_bit(np, &read_bit, 1, gpreg);
		*read_data |= ((read_bit & 0x01) << (7 - x));
	}

	S24C16_write_ack(np, ack_data, gpreg, gpcntl);
}

#ifdef SYM_CONF_NVRAM_WRITE_SUPPORT
/*
 *  Write 'len' bytes starting at 'offset'.
 */
static int sym_write_S24C16_nvram(struct sym_device *np, int offset,
		u_char *data, int len)
{
	u_char	gpcntl, gpreg;
	u_char	old_gpcntl, old_gpreg;
	u_char	ack_data;
	int	x;

	/* save current state of GPCNTL and GPREG */
	old_gpreg	= INB(np, nc_gpreg);
	old_gpcntl	= INB(np, nc_gpcntl);
	gpcntl		= old_gpcntl & 0x1c;

	/* set up GPREG & GPCNTL to set GPIO0 and GPIO1 in to known state */
	OUTB(np, nc_gpreg,  old_gpreg);
	OUTB(np, nc_gpcntl, gpcntl);

	/* this is to set NVRAM into a known state with GPIO0/1 both low */
	gpreg = old_gpreg;
	S24C16_set_bit(np, 0, &gpreg, CLR_CLK);
	S24C16_set_bit(np, 0, &gpreg, CLR_BIT);
		
	/* now set NVRAM inactive with GPIO0/1 both high */
	S24C16_stop(np, &gpreg);

	/* NVRAM has to be written in segments of 16 bytes */
	for (x = 0; x < len ; x += 16) {
		do {
			S24C16_start(np, &gpreg);
			S24C16_write_byte(np, &ack_data,
					  0xa0 | (((offset+x) >> 7) & 0x0e),
					  &gpreg, &gpcntl);
		} while (ack_data & 0x01);

		S24C16_write_byte(np, &ack_data, (offset+x) & 0xff, 
				  &gpreg, &gpcntl);

		for (y = 0; y < 16; y++)
			S24C16_write_byte(np, &ack_data, data[x+y], 
					  &gpreg, &gpcntl);
		S24C16_stop(np, &gpreg);
	}

	/* return GPIO0/1 to original states after having accessed NVRAM */
	OUTB(np, nc_gpcntl, old_gpcntl);
	OUTB(np, nc_gpreg,  old_gpreg);

	return 0;
}
#endif /* SYM_CONF_NVRAM_WRITE_SUPPORT */

/*
 *  Read 'len' bytes starting at 'offset'.
 */
static int sym_read_S24C16_nvram(struct sym_device *np, int offset, u_char *data, int len)
{
	u_char	gpcntl, gpreg;
	u_char	old_gpcntl, old_gpreg;
	u_char	ack_data;
	int	retv = 1;
	int	x;

	/* save current state of GPCNTL and GPREG */
	old_gpreg	= INB(np, nc_gpreg);
	old_gpcntl	= INB(np, nc_gpcntl);
	gpcntl		= old_gpcntl & 0x1c;

	/* set up GPREG & GPCNTL to set GPIO0 and GPIO1 in to known state */
	OUTB(np, nc_gpreg,  old_gpreg);
	OUTB(np, nc_gpcntl, gpcntl);

	/* this is to set NVRAM into a known state with GPIO0/1 both low */
	gpreg = old_gpreg;
	S24C16_set_bit(np, 0, &gpreg, CLR_CLK);
	S24C16_set_bit(np, 0, &gpreg, CLR_BIT);
		
	/* now set NVRAM inactive with GPIO0/1 both high */
	S24C16_stop(np, &gpreg);
	
	/* activate NVRAM */
	S24C16_start(np, &gpreg);

	/* write device code and random address MSB */
	S24C16_write_byte(np, &ack_data,
		0xa0 | ((offset >> 7) & 0x0e), &gpreg, &gpcntl);
	if (ack_data & 0x01)
		goto out;

	/* write random address LSB */
	S24C16_write_byte(np, &ack_data,
		offset & 0xff, &gpreg, &gpcntl);
	if (ack_data & 0x01)
		goto out;

	/* regenerate START state to set up for reading */
	S24C16_start(np, &gpreg);
	
	/* rewrite device code and address MSB with read bit set (lsb = 0x01) */
	S24C16_write_byte(np, &ack_data,
		0xa1 | ((offset >> 7) & 0x0e), &gpreg, &gpcntl);
	if (ack_data & 0x01)
		goto out;

	/* now set up GPIO0 for inputting data */
	gpcntl |= 0x01;
	OUTB(np, nc_gpcntl, gpcntl);
		
	/* input all requested data - only part of total NVRAM */
	for (x = 0; x < len; x++) 
		S24C16_read_byte(np, &data[x], (x == (len-1)), &gpreg, &gpcntl);

	/* finally put NVRAM back in inactive mode */
	gpcntl &= 0xfe;
	OUTB(np, nc_gpcntl, gpcntl);
	S24C16_stop(np, &gpreg);
	retv = 0;
out:
	/* return GPIO0/1 to original states after having accessed NVRAM */
	OUTB(np, nc_gpcntl, old_gpcntl);
	OUTB(np, nc_gpreg,  old_gpreg);

	return retv;
}

#undef SET_BIT
#undef CLR_BIT
#undef SET_CLK
#undef CLR_CLK

/*
 *  Try reading Symbios NVRAM.
 *  Return 0 if OK.
 */
static int sym_read_Symbios_nvram(struct sym_device *np, Symbios_nvram *nvram)
{
	static u_char Symbios_trailer[6] = {0xfe, 0xfe, 0, 0, 0, 0};
	u_char *data = (u_char *) nvram;
	int len  = sizeof(*nvram);
	u_short	csum;
	int x;

	/* probe the 24c16 and read the SYMBIOS 24c16 area */
	if (sym_read_S24C16_nvram (np, SYMBIOS_NVRAM_ADDRESS, data, len))
		return 1;

	/* check valid NVRAM signature, verify byte count and checksum */
	if (nvram->type != 0 ||
	    memcmp(nvram->trailer, Symbios_trailer, 6) ||
	    nvram->byte_count != len - 12)
		return 1;

	/* verify checksum */
	for (x = 6, csum = 0; x < len - 6; x++)
		csum += data[x];
	if (csum != nvram->checksum)
		return 1;

	return 0;
}

/*
 *  93C46 EEPROM reading.
 *
 *  GPOI0 - data in
 *  GPIO1 - data out
 *  GPIO2 - clock
 *  GPIO4 - chip select
 *
 *  Used by Tekram.
 */

/*
 *  Pulse clock bit in GPIO0
 */
static void T93C46_Clk(struct sym_device *np, u_char *gpreg)
{
	OUTB(np, nc_gpreg, *gpreg | 0x04);
	INB(np, nc_mbox1);
	udelay(2);
	OUTB(np, nc_gpreg, *gpreg);
}

/* 
 *  Read bit from NVRAM
 */
static void T93C46_Read_Bit(struct sym_device *np, u_char *read_bit, u_char *gpreg)
{
	udelay(2);
	T93C46_Clk(np, gpreg);
	*read_bit = INB(np, nc_gpreg);
}

/*
 *  Write bit to GPIO0
 */
static void T93C46_Write_Bit(struct sym_device *np, u_char write_bit, u_char *gpreg)
{
	if (write_bit & 0x01)
		*gpreg |= 0x02;
	else
		*gpreg &= 0xfd;
		
	*gpreg |= 0x10;
		
	OUTB(np, nc_gpreg, *gpreg);
	INB(np, nc_mbox1);
	udelay(2);

	T93C46_Clk(np, gpreg);
}

/*
 *  Send STOP condition to NVRAM - puts NVRAM to sleep... ZZZzzz!!
 */
static void T93C46_Stop(struct sym_device *np, u_char *gpreg)
{
	*gpreg &= 0xef;
	OUTB(np, nc_gpreg, *gpreg);
	INB(np, nc_mbox1);
	udelay(2);

	T93C46_Clk(np, gpreg);
}

/*
 *  Send read command and address to NVRAM
 */
static void T93C46_Send_Command(struct sym_device *np, u_short write_data, 
				u_char *read_bit, u_char *gpreg)
{
	int x;

	/* send 9 bits, start bit (1), command (2), address (6)  */
	for (x = 0; x < 9; x++)
		T93C46_Write_Bit(np, (u_char) (write_data >> (8 - x)), gpreg);

	*read_bit = INB(np, nc_gpreg);
}

/*
 *  READ 2 bytes from the NVRAM
 */
static void T93C46_Read_Word(struct sym_device *np,
		unsigned short *nvram_data, unsigned char *gpreg)
{
	int x;
	u_char read_bit;

	*nvram_data = 0;
	for (x = 0; x < 16; x++) {
		T93C46_Read_Bit(np, &read_bit, gpreg);

		if (read_bit & 0x01)
			*nvram_data |=  (0x01 << (15 - x));
		else
			*nvram_data &= ~(0x01 << (15 - x));
	}
}

/*
 *  Read Tekram NvRAM data.
 */
static int T93C46_Read_Data(struct sym_device *np, unsigned short *data,
		int len, unsigned char *gpreg)
{
	int x;

	for (x = 0; x < len; x++)  {
		unsigned char read_bit;
		/* output read command and address */
		T93C46_Send_Command(np, 0x180 | x, &read_bit, gpreg);
		if (read_bit & 0x01)
			return 1; /* Bad */
		T93C46_Read_Word(np, &data[x], gpreg);
		T93C46_Stop(np, gpreg);
	}

	return 0;
}

/*
 *  Try reading 93C46 Tekram NVRAM.
 */
static int sym_read_T93C46_nvram(struct sym_device *np, Tekram_nvram *nvram)
{
	u_char gpcntl, gpreg;
	u_char old_gpcntl, old_gpreg;
	int retv = 1;

	/* save current state of GPCNTL and GPREG */
	old_gpreg	= INB(np, nc_gpreg);
	old_gpcntl	= INB(np, nc_gpcntl);

	/* set up GPREG & GPCNTL to set GPIO0/1/2/4 in to known state, 0 in,
	   1/2/4 out */
	gpreg = old_gpreg & 0xe9;
	OUTB(np, nc_gpreg, gpreg);
	gpcntl = (old_gpcntl & 0xe9) | 0x09;
	OUTB(np, nc_gpcntl, gpcntl);

	/* input all of NVRAM, 64 words */
	retv = T93C46_Read_Data(np, (u_short *) nvram,
				sizeof(*nvram) / sizeof(short), &gpreg);
	
	/* return GPIO0/1/2/4 to original states after having accessed NVRAM */
	OUTB(np, nc_gpcntl, old_gpcntl);
	OUTB(np, nc_gpreg,  old_gpreg);

	return retv;
}

/*
 *  Try reading Tekram NVRAM.
 *  Return 0 if OK.
 */
static int sym_read_Tekram_nvram (struct sym_device *np, Tekram_nvram *nvram)
{
	u_char *data = (u_char *) nvram;
	int len = sizeof(*nvram);
	u_short	csum;
	int x;

	switch (np->device_id) {
	case PCI_DEVICE_ID_NCR_53C885:
	case PCI_DEVICE_ID_NCR_53C895:
	case PCI_DEVICE_ID_NCR_53C896:
		x = sym_read_S24C16_nvram(np, TEKRAM_24C16_NVRAM_ADDRESS,
					  data, len);
		break;
	case PCI_DEVICE_ID_NCR_53C875:
		x = sym_read_S24C16_nvram(np, TEKRAM_24C16_NVRAM_ADDRESS,
					  data, len);
		if (!x)
			break;
	default:
		x = sym_read_T93C46_nvram(np, nvram);
		break;
	}
	if (x)
		return 1;

	/* verify checksum */
	for (x = 0, csum = 0; x < len - 1; x += 2)
		csum += data[x] + (data[x+1] << 8);
	if (csum != 0x1234)
		return 1;

	return 0;
}

#ifdef CONFIG_PARISC
/*
 * Host firmware (PDC) keeps a table for altering SCSI capabilities.
 * Many newer machines export one channel of 53c896 chip as SE, 50-pin HD.
 * Also used for Multi-initiator SCSI clusters to set the SCSI Initiator ID.
 */
static int sym_read_parisc_pdc(struct sym_device *np, struct pdc_initiator *pdc)
{
	struct hardware_path hwpath;
	get_pci_node_path(np->pdev, &hwpath);
	if (!pdc_get_initiator(&hwpath, pdc))
		return 0;

	return SYM_PARISC_PDC;
}
#else
static inline int sym_read_parisc_pdc(struct sym_device *np,
					struct pdc_initiator *x)
{
	return 0;
}
#endif

/*
 *  Try reading Symbios or Tekram NVRAM
 */
int sym_read_nvram(struct sym_device *np, struct sym_nvram *nvp)
{
	if (!sym_read_Symbios_nvram(np, &nvp->data.Symbios)) {
		nvp->type = SYM_SYMBIOS_NVRAM;
		sym_display_Symbios_nvram(np, &nvp->data.Symbios);
	} else if (!sym_read_Tekram_nvram(np, &nvp->data.Tekram)) {
		nvp->type = SYM_TEKRAM_NVRAM;
		sym_display_Tekram_nvram(np, &nvp->data.Tekram);
	} else {
		nvp->type = sym_read_parisc_pdc(np, &nvp->data.parisc);
	}
	return nvp->type;
}

char *sym_nvram_type(struct sym_nvram *nvp)
{
	switch (nvp->type) {
	case SYM_SYMBIOS_NVRAM:
		return "Symbios NVRAM";
	case SYM_TEKRAM_NVRAM:
		return "Tekram NVRAM";
	case SYM_PARISC_PDC:
		return "PA-RISC Firmware";
	default:
		return "No NVRAM";
	}
}
OpenPOWER on IntegriCloud