aboutsummaryrefslogtreecommitdiff
path: root/drivers/sym53c8xx.c
blob: ae10f80ecfb11720140a5124c30bdb6741ef70f8 (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
780
781
782
783
784
785
786
787
788
789
790
791
792
793
/*
 * (C) Copyright 2001
 * Denis Peter, MPL AG Switzerland, d.peter@mpl.ch.
 *
 * 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
 * partly derived from
 * linux/drivers/scsi/sym53c8xx.c
 *
 */

/*
 * SCSI support based on the chip sym53C810.
 *
 * 09-19-2001 Andreas Heppel, Sysgo RTS GmbH <aheppel@sysgo.de>
 *		The local version of this driver for the BAB750 board does not
 *		use interrupts but polls the chip instead (see the call of
 *		'handle_scsi_int()' in 'scsi_issue()'.
 */

#include <common.h>

#ifdef CONFIG_SCSI_SYM53C8XX

#include <command.h>
#include <pci.h>
#include <asm/processor.h>
#include <sym53c8xx.h>
#include <scsi.h>

#undef	SYM53C8XX_DEBUG

#ifdef	SYM53C8XX_DEBUG
#define	PRINTF(fmt,args...)	printf (fmt ,##args)
#else
#define PRINTF(fmt,args...)
#endif

#if (CONFIG_COMMANDS & CFG_CMD_SCSI) && defined(CONFIG_SCSI_SYM53C8XX)

#undef SCSI_SINGLE_STEP
/*
 * Single Step is only used for debug purposes
 */
#ifdef SCSI_SINGLE_STEP
static unsigned long start_script_select;
static unsigned long start_script_msgout;
static unsigned long start_script_msgin;
static unsigned long start_script_msg_ext;
static unsigned long start_script_cmd;
static unsigned long start_script_data_in;
static unsigned long start_script_data_out;
static unsigned long start_script_status;
static unsigned long start_script_complete;
static unsigned long start_script_error;
static unsigned long start_script_reselection;
static unsigned int len_script_select;
static unsigned int len_script_msgout;
static unsigned int len_script_msgin;
static unsigned int len_script_msg_ext;
static unsigned int len_script_cmd;
static unsigned int len_script_data_in;
static unsigned int len_script_data_out;
static unsigned int len_script_status;
static unsigned int len_script_complete;
static unsigned int len_script_error;
static unsigned int len_script_reselection;
#endif


static unsigned short scsi_int_mask;		/* shadow register for SCSI related interrupts */
static unsigned char  script_int_mask;	/* shadow register for SCRIPT related interrupts */
static unsigned long script_select[8]; /* script for selection */
static unsigned long script_msgout[8]; /* script for message out phase (NOT USED) */
static unsigned long script_msgin[14]; /* script for message in phase */
static unsigned long script_msg_ext[32]; /* script for message in phase when more than 1 byte message */
static unsigned long script_cmd[18];    /* script for command phase */
static unsigned long script_data_in[8]; /* script for data in phase */
static unsigned long script_data_out[8]; /* script for data out phase */
static unsigned long script_status[6]; /* script for status phase */
static unsigned long script_complete[10]; /* script for complete */
static unsigned long script_reselection[4]; /* script for reselection (NOT USED) */
static unsigned long script_error[2]; /* script for error handling */

static unsigned long int_stat[3]; /* interrupt status */
static unsigned long scsi_mem_addr; /* base memory address =SCSI_MEM_ADDRESS; */

#define bus_to_phys(a)	pci_mem_to_phys(busdevfunc, (unsigned long) (a))
#define phys_to_bus(a)	pci_phys_to_mem(busdevfunc, (unsigned long) (a))

#define SCSI_MAX_RETRY 3 /* number of retries in scsi_issue() */

#define SCSI_MAX_RETRY_NOT_READY 10 /* number of retries when device is not ready */
#define SCSI_NOT_READY_TIME_OUT 500 /* timeout per retry when not ready */

/*********************************************************************************
 * forward declerations
 */

void scsi_chip_init(void);
void handle_scsi_int(void);


/********************************************************************************
 * reports SCSI errors to the user
 */
void scsi_print_error(ccb *pccb)
{
	int i;
	printf("SCSI Error: Target %d LUN %d Command %02X\n",pccb->target, pccb->lun, pccb->cmd[0]);
	printf("       CCB: ");
	for(i=0;i<pccb->cmdlen;i++)
		printf("%02X ",pccb->cmd[i]);
	printf("(len=%d)\n",pccb->cmdlen);
	printf("     Cntrl: ");
	switch(pccb->contr_stat) {
		case SIR_COMPLETE: 						printf("Complete (no Error)\n"); break;
		case SIR_SEL_ATN_NO_MSG_OUT: 	printf("Selected with ATN no MSG out phase\n"); break;
		case SIR_CMD_OUT_ILL_PH: 			printf("Command out illegal phase\n"); break;
		case SIR_MSG_RECEIVED: 				printf("MSG received Error\n"); break;
		case SIR_DATA_IN_ERR: 				printf("Data in Error\n"); break;
		case SIR_DATA_OUT_ERR: 				printf("Data out Error\n"); break;
		case SIR_SCRIPT_ERROR: 				printf("Script Error\n"); break;
		case SIR_MSG_OUT_NO_CMD: 			printf("MSG out no Command phase\n"); break;
		case SIR_MSG_OVER7: 					printf("MSG in over 7 bytes\n"); break;
		case INT_ON_FY: 							printf("Interrupt on fly\n"); break;
		case SCSI_SEL_TIME_OUT:				printf("SCSI Selection Timeout\n"); break;
		case SCSI_HNS_TIME_OUT:				printf("SCSI Handshake Timeout\n"); break;
		case SCSI_MA_TIME_OUT:				printf("SCSI Phase Error\n"); break;
		case SCSI_UNEXP_DIS:					printf("SCSI unexpected disconnect\n"); break;
		default:											printf("unknown status %lx\n",pccb->contr_stat); break;
	}
	printf("     Sense: SK %x (",pccb->sense_buf[2]&0x0f);
	switch(pccb->sense_buf[2]&0xf) {
		case SENSE_NO_SENSE: printf("No Sense)"); break;
		case SENSE_RECOVERED_ERROR: printf("Recovered Error)"); break;
		case SENSE_NOT_READY:	printf("Not Ready)"); break;
		case SENSE_MEDIUM_ERROR: printf("Medium Error)"); break;
		case SENSE_HARDWARE_ERROR: printf("Hardware Error)"); break;
		case SENSE_ILLEGAL_REQUEST: printf("Illegal request)"); break;
		case SENSE_UNIT_ATTENTION: printf("Unit Attention)"); break;
		case SENSE_DATA_PROTECT: printf("Data Protect)"); break;
		case SENSE_BLANK_CHECK:	printf("Blank check)"); break;
		case SENSE_VENDOR_SPECIFIC: printf("Vendor specific)"); break;
		case SENSE_COPY_ABORTED: printf("Copy aborted)"); break;
		case SENSE_ABORTED_COMMAND:	printf("Aborted Command)"); break;
		case SENSE_VOLUME_OVERFLOW:	printf("Volume overflow)"); break;
		case SENSE_MISCOMPARE: printf("Misscompare\n"); break;
		default: printf("Illegal Sensecode\n"); break;
	}
	printf(" ASC %x ASCQ %x\n",pccb->sense_buf[12],pccb->sense_buf[13]);
	printf("    Status: ");
	switch(pccb->status) {
		case S_GOOD :	printf("Good\n"); break;
		case S_CHECK_COND: printf("Check condition\n"); break;
		case S_COND_MET: printf("Condition Met\n"); break;
		case S_BUSY: printf("Busy\n"); break;
		case S_INT: printf("Intermediate\n"); break;
		case S_INT_COND_MET: printf("Intermediate condition met\n"); break;
		case S_CONFLICT: printf("Reservation conflict\n"); break;
		case S_TERMINATED: printf("Command terminated\n"); break;
		case S_QUEUE_FULL: printf("Task set full\n"); break;
		default: printf("unknown: %02X\n",pccb->status); break;
	}

}


/******************************************************************************
 * sets-up the SCSI controller
 * the base memory address is retrived via the pci_read_config_dword
 */
void scsi_low_level_init(int busdevfunc)
{
	unsigned int cmd;
	unsigned int addr;
	unsigned char vec;

	pci_read_config_byte(busdevfunc, PCI_INTERRUPT_LINE, &vec);
	pci_read_config_dword(busdevfunc, PCI_BASE_ADDRESS_1, &addr);

	addr = bus_to_phys(addr & ~0xf);

	/*
	 * Enable bus mastering in case this has not been done, yet.
	 */
	pci_read_config_dword(busdevfunc, PCI_COMMAND, &cmd);
	cmd |= PCI_COMMAND_MASTER;
	pci_write_config_dword(busdevfunc, PCI_COMMAND, cmd);

	scsi_mem_addr = addr;

	scsi_chip_init();
	scsi_bus_reset();
}


/************************************************************************************
 * Low level Part of SCSI Driver
 */

/*
 * big-endian -> little endian conversion for the script
 */
unsigned long swap_script(unsigned long val)
{
	unsigned long tmp;
	tmp = ((val>>24)&0xff) | ((val>>8)&0xff00) | ((val<<8)&0xff0000) | ((val<<24)&0xff000000);
	return tmp;
}


void scsi_write_byte(ulong offset,unsigned char val)
{
	out8(scsi_mem_addr+offset,val);
}


unsigned char scsi_read_byte(ulong offset)
{
	return(in8(scsi_mem_addr+offset));
}


/********************************************************************************
 * interrupt handler
 */
void handle_scsi_int(void)
{
	unsigned char stat,stat1,stat2;
	unsigned short sstat;
	int i;
#ifdef SCSI_SINGLE_STEP
	unsigned long tt;
#endif
	stat=scsi_read_byte(ISTAT);
	if((stat & DIP)==DIP) { /* DMA Interrupt pending */
		stat1=scsi_read_byte(DSTAT);
#ifdef SCSI_SINGLE_STEP
		if((stat1 & SSI)==SSI)
		{
			tt=in32r(scsi_mem_addr+DSP);
			if(((tt)>=start_script_select) && ((tt)<start_script_select+len_script_select)) {
				printf("select %d\n",(tt-start_script_select)>>2);
				goto end_single;
			}
			if(((tt)>=start_script_msgout) && ((tt)<start_script_msgout+len_script_msgout)) {
				printf("msgout %d\n",(tt-start_script_msgout)>>2);
				goto end_single;
			}
			if(((tt)>=start_script_msgin) && ((tt)<start_script_msgin+len_script_msgin)) {
				printf("msgin %d\n",(tt-start_script_msgin)>>2);
				goto end_single;
			}
			if(((tt)>=start_script_msg_ext) && ((tt)<start_script_msg_ext+len_script_msg_ext)) {
				printf("msgin_ext %d\n",(tt-start_script_msg_ext)>>2);
				goto end_single;
			}
			if(((tt)>=start_script_cmd) && ((tt)<start_script_cmd+len_script_cmd)) {
				printf("cmd %d\n",(tt-start_script_cmd)>>2);
				goto end_single;
			}
			if(((tt)>=start_script_data_in) && ((tt)<start_script_data_in+len_script_data_in)) {
				printf("data_in %d\n",(tt-start_script_data_in)>>2);
				goto end_single;
			}
			if(((tt)>=start_script_data_out) && ((tt)<start_script_data_out+len_script_data_out)) {
				printf("data_out %d\n",(tt-start_script_data_out)>>2);
				goto end_single;
			}
			if(((tt)>=start_script_status) && ((tt)<start_script_status+len_script_status)) {
				printf("status %d\n",(tt-start_script_status)>>2);
				goto end_single;
			}
			if(((tt)>=start_script_complete) && ((tt)<start_script_complete+len_script_complete)) {
				printf("complete %d\n",(tt-start_script_complete)>>2);
				goto end_single;
			}
			if(((tt)>=start_script_error) && ((tt)<start_script_error+len_script_error)) {
				printf("error %d\n",(tt-start_script_error)>>2);
				goto end_single;
			}
			if(((tt)>=start_script_reselection) && ((tt)<start_script_reselection+len_script_reselection)) {
				printf("reselection %d\n",(tt-start_script_reselection)>>2);
				goto end_single;
			}
			printf("sc: %lx\n",tt);
end_single:
			stat2=scsi_read_byte(DCNTL);
			stat2|=STD;
			scsi_write_byte(DCNTL,stat2);
		}
#endif
		if((stat1 & SIR)==SIR) /* script interrupt */
		{
			int_stat[0]=in32(scsi_mem_addr+DSPS);
		}
		if((stat1 & DFE)==0) { /* fifo not epmty */
			scsi_write_byte(CTEST3,CLF); /* Clear DMA FIFO */
			stat2=scsi_read_byte(STEST3);
			scsi_write_byte(STEST3,(stat2 | CSF)); /* Clear SCSI FIFO */
		}
	}
	if((stat & SIP)==SIP) {  /* scsi interrupt */
		sstat = (unsigned short)scsi_read_byte(SIST+1);
		sstat <<=8;
		sstat |= (unsigned short)scsi_read_byte(SIST);
		for(i=0;i<3;i++) {
			if(int_stat[i]==0)
				break; /* found an empty int status */
		}
		int_stat[i]=SCSI_INT_STATE | sstat;
		stat1=scsi_read_byte(DSTAT);
		if((stat1 & DFE)==0) { /* fifo not epmty */
			scsi_write_byte(CTEST3,CLF); /* Clear DMA FIFO */
			stat2=scsi_read_byte(STEST3);
			scsi_write_byte(STEST3,(stat2 | CSF)); /* Clear SCSI FIFO */
		}
	}
	if((stat & INTF)==INTF) { /* interrupt on Fly */
		scsi_write_byte(ISTAT,stat); /* clear it */
		for(i=0;i<3;i++) {
			if(int_stat[i]==0)
				break; /* found an empty int status */
		}
		int_stat[i]=INT_ON_FY;
	}
}

void scsi_bus_reset(void)
{
	unsigned char t;
	int i;
	int end = CFG_SCSI_SPIN_UP_TIME*1000;

	t=scsi_read_byte(SCNTL1);
	scsi_write_byte(SCNTL1,(t | CRST));
	udelay(50);
	scsi_write_byte(SCNTL1,t);

	puts("waiting for devices to spin up");
	for(i=0;i<end;i++) {
		udelay(1000); /* give the devices time to spin up */
		if (i % 1000 == 0)
			putc('.');
	}
	putc('\n');
	scsi_chip_init(); /* reinit the chip ...*/

}

void scsi_int_enable(void)
{
	scsi_write_byte(SIEN,(unsigned char)scsi_int_mask);
	scsi_write_byte(SIEN+1,(unsigned char)(scsi_int_mask>>8));
	scsi_write_byte(DIEN,script_int_mask);
}

void scsi_write_dsp(unsigned long start)
{
	unsigned long val;
#ifdef SCSI_SINGLE_STEP
	unsigned char t;
#endif
	val = start;
	out32r(scsi_mem_addr + DSP,start);
#ifdef SCSI_SINGLE_STEP
	t=scsi_read_byte(DCNTL);
  t|=STD;
	scsi_write_byte(DCNTL,t);
#endif
}

/* only used for debug purposes */
void scsi_print_script(void)
{
	printf("script_select @         0x%08lX\n",(unsigned long)&script_select[0]);
	printf("script_msgout @         0x%08lX\n",(unsigned long)&script_msgout[0]);
	printf("script_msgin @          0x%08lX\n",(unsigned long)&script_msgin[0]);
	printf("script_msgext @         0x%08lX\n",(unsigned long)&script_msg_ext[0]);
	printf("script_cmd @            0x%08lX\n",(unsigned long)&script_cmd[0]);
	printf("script_data_in @        0x%08lX\n",(unsigned long)&script_data_in[0]);
	printf("script_data_out @       0x%08lX\n",(unsigned long)&script_data_out[0]);
	printf("script_status @         0x%08lX\n",(unsigned long)&script_status[0]);
	printf("script_complete @       0x%08lX\n",(unsigned long)&script_complete[0]);
	printf("script_error @          0x%08lX\n",(unsigned long)&script_error[0]);
}


void scsi_set_script(ccb *pccb)
{
	int busdevfunc = pccb->priv;
	int i;
	i=0;
	script_select[i++]=swap_script(SCR_REG_REG(GPREG, SCR_AND, 0xfe));
	script_select[i++]=0; /* LED ON */
	script_select[i++]=swap_script(SCR_CLR(SCR_TRG)); /* select initiator mode */
	script_select[i++]=0;
	/* script_select[i++]=swap_script(SCR_SEL_ABS_ATN | pccb->target << 16); */
	script_select[i++]=swap_script(SCR_SEL_ABS | pccb->target << 16);
	script_select[i++]=swap_script(phys_to_bus(&script_cmd[4])); /* error handling */
	script_select[i++]=swap_script(SCR_JUMP); /* next section */
	/*	script_select[i++]=swap_script((unsigned long)&script_msgout[0]); */ /* message out */
	script_select[i++]=swap_script(phys_to_bus(&script_cmd[0])); /* command out */

#ifdef SCSI_SINGLE_STEP
	start_script_select=(unsigned long)&script_select[0];
	len_script_select=i*4;
#endif

	i=0;
	script_msgout[i++]=swap_script(SCR_INT ^ IFFALSE (WHEN (SCR_MSG_OUT)));
	script_msgout[i++]=SIR_SEL_ATN_NO_MSG_OUT;
	script_msgout[i++]=swap_script(	SCR_MOVE_ABS(1) ^ SCR_MSG_OUT);
	script_msgout[i++]=swap_script(phys_to_bus(&pccb->msgout[0]));
	script_msgout[i++]=swap_script(SCR_JUMP ^ IFTRUE (WHEN (SCR_COMMAND))); /* if Command phase */
	script_msgout[i++]=swap_script(phys_to_bus(&script_cmd[0])); /* switch to command */
	script_msgout[i++]=swap_script(SCR_INT); /* interrupt if not */
	script_msgout[i++]=SIR_MSG_OUT_NO_CMD;

#ifdef SCSI_SINGLE_STEP
	start_script_msgout=(unsigned long)&script_msgout[0];
	len_script_msgout=i*4;
#endif
	i=0;
	script_cmd[i++]=swap_script(SCR_MOVE_ABS(pccb->cmdlen) ^ SCR_COMMAND);
	script_cmd[i++]=swap_script(phys_to_bus(&pccb->cmd[0]));
	script_cmd[i++]=swap_script(SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_IN))); /* message in ? */
	script_cmd[i++]=swap_script(phys_to_bus(&script_msgin[0]));
	script_cmd[i++]=swap_script(SCR_JUMP ^ IFTRUE (IF (SCR_DATA_OUT))); /* data out ? */
	script_cmd[i++]=swap_script(phys_to_bus(&script_data_out[0]));
	script_cmd[i++]=swap_script(SCR_JUMP ^ IFTRUE (IF (SCR_DATA_IN))); /* data in ? */
	script_cmd[i++]=swap_script(phys_to_bus(&script_data_in[0]));
	script_cmd[i++]=swap_script(SCR_JUMP ^ IFTRUE (IF (SCR_STATUS)));  /* status ? */
	script_cmd[i++]=swap_script(phys_to_bus(&script_status[0]));
	script_cmd[i++]=swap_script(SCR_JUMP ^ IFTRUE (IF (SCR_COMMAND)));  /* command ? */
	script_cmd[i++]=swap_script(phys_to_bus(&script_cmd[0]));
	script_cmd[i++]=swap_script(SCR_JUMP ^ IFTRUE (IF (SCR_MSG_OUT)));  /* message out ? */
	script_cmd[i++]=swap_script(phys_to_bus(&script_msgout[0]));
	script_cmd[i++]=swap_script(SCR_JUMP ^ IFTRUE (IF (SCR_MSG_IN))); /* just for error handling message in ? */
	script_cmd[i++]=swap_script(phys_to_bus(&script_msgin[0]));
	script_cmd[i++]=swap_script(SCR_INT); /* interrupt if not */
	script_cmd[i++]=SIR_CMD_OUT_ILL_PH;
#ifdef SCSI_SINGLE_STEP
	start_script_cmd=(unsigned long)&script_cmd[0];
	len_script_cmd=i*4;
#endif
	i=0;
	script_data_out[i++]=swap_script(SCR_MOVE_ABS(pccb->datalen)^ SCR_DATA_OUT); /* move */
	script_data_out[i++]=swap_script(phys_to_bus(pccb->pdata)); /* pointer to buffer */
	script_data_out[i++]=swap_script(SCR_JUMP ^ IFTRUE (WHEN (SCR_STATUS)));
	script_data_out[i++]=swap_script(phys_to_bus(&script_status[0]));
	script_data_out[i++]=swap_script(SCR_INT);
	script_data_out[i++]=SIR_DATA_OUT_ERR;

#ifdef SCSI_SINGLE_STEP
	start_script_data_out=(unsigned long)&script_data_out[0];
	len_script_data_out=i*4;
#endif
	i=0;
	script_data_in[i++]=swap_script(SCR_MOVE_ABS(pccb->datalen)^ SCR_DATA_IN); /* move  */
	script_data_in[i++]=swap_script(phys_to_bus(pccb->pdata)); /* pointer to buffer */
	script_data_in[i++]=swap_script(SCR_JUMP ^ IFTRUE (WHEN (SCR_STATUS)));
	script_data_in[i++]=swap_script(phys_to_bus(&script_status[0]));
	script_data_in[i++]=swap_script(SCR_INT);
	script_data_in[i++]=SIR_DATA_IN_ERR;
#ifdef SCSI_SINGLE_STEP
	start_script_data_in=(unsigned long)&script_data_in[0];
	len_script_data_in=i*4;
#endif
	i=0;
	script_msgin[i++]=swap_script(SCR_MOVE_ABS (1) ^ SCR_MSG_IN);
	script_msgin[i++]=swap_script(phys_to_bus(&pccb->msgin[0]));
	script_msgin[i++]=swap_script(SCR_JUMP ^ IFTRUE (DATA (M_COMPLETE)));
	script_msgin[i++]=swap_script(phys_to_bus(&script_complete[0]));
	script_msgin[i++]=swap_script(SCR_JUMP ^ IFTRUE (DATA (M_DISCONNECT)));
	script_msgin[i++]=swap_script(phys_to_bus(&script_complete[0]));
	script_msgin[i++]=swap_script(SCR_JUMP ^ IFTRUE (DATA (M_SAVE_DP)));
	script_msgin[i++]=swap_script(phys_to_bus(&script_complete[0]));
	script_msgin[i++]=swap_script(SCR_JUMP ^ IFTRUE (DATA (M_RESTORE_DP)));
	script_msgin[i++]=swap_script(phys_to_bus(&script_complete[0]));
	script_msgin[i++]=swap_script(SCR_JUMP ^ IFTRUE (DATA (M_EXTENDED)));
	script_msgin[i++]=swap_script(phys_to_bus(&script_msg_ext[0]));
	script_msgin[i++]=swap_script(SCR_INT);
	script_msgin[i++]=SIR_MSG_RECEIVED;
#ifdef SCSI_SINGLE_STEP
	start_script_msgin=(unsigned long)&script_msgin[0];
	len_script_msgin=i*4;
#endif
	i=0;
	script_msg_ext[i++]=swap_script(SCR_CLR (SCR_ACK)); /* clear ACK */
	script_msg_ext[i++]=0;
	script_msg_ext[i++]=swap_script(SCR_MOVE_ABS (1) ^ SCR_MSG_IN); /* assuming this is the msg length */
	script_msg_ext[i++]=swap_script(phys_to_bus(&pccb->msgin[1]));
	script_msg_ext[i++]=swap_script(SCR_JUMP ^ IFFALSE (IF (SCR_MSG_IN)));
	script_msg_ext[i++]=swap_script(phys_to_bus(&script_complete[0])); /* no more bytes */
	script_msg_ext[i++]=swap_script(SCR_MOVE_ABS (1) ^ SCR_MSG_IN); /* next */
	script_msg_ext[i++]=swap_script(phys_to_bus(&pccb->msgin[2]));
	script_msg_ext[i++]=swap_script(SCR_JUMP ^ IFFALSE (IF (SCR_MSG_IN)));
	script_msg_ext[i++]=swap_script(phys_to_bus(&script_complete[0])); /* no more bytes */
	script_msg_ext[i++]=swap_script(SCR_MOVE_ABS (1) ^ SCR_MSG_IN); /* next */
	script_msg_ext[i++]=swap_script(phys_to_bus(&pccb->msgin[3]));
	script_msg_ext[i++]=swap_script(SCR_JUMP ^ IFFALSE (IF (SCR_MSG_IN)));
	script_msg_ext[i++]=swap_script(phys_to_bus(&script_complete[0])); /* no more bytes */
	script_msg_ext[i++]=swap_script(SCR_MOVE_ABS (1) ^ SCR_MSG_IN); /* next */
	script_msg_ext[i++]=swap_script(phys_to_bus(&pccb->msgin[4]));
	script_msg_ext[i++]=swap_script(SCR_JUMP ^ IFFALSE (IF (SCR_MSG_IN)));
	script_msg_ext[i++]=swap_script(phys_to_bus(&script_complete[0])); /* no more bytes */
	script_msg_ext[i++]=swap_script(SCR_MOVE_ABS (1) ^ SCR_MSG_IN); /* next */
	script_msg_ext[i++]=swap_script(phys_to_bus(&pccb->msgin[5]));
	script_msg_ext[i++]=swap_script(SCR_JUMP ^ IFFALSE (IF (SCR_MSG_IN)));
	script_msg_ext[i++]=swap_script(phys_to_bus(&script_complete[0])); /* no more bytes */
	script_msg_ext[i++]=swap_script(SCR_MOVE_ABS (1) ^ SCR_MSG_IN); /* next */
	script_msg_ext[i++]=swap_script(phys_to_bus(&pccb->msgin[6]));
	script_msg_ext[i++]=swap_script(SCR_JUMP ^ IFFALSE (IF (SCR_MSG_IN)));
	script_msg_ext[i++]=swap_script(phys_to_bus(&script_complete[0])); /* no more bytes */
	script_msg_ext[i++]=swap_script(SCR_MOVE_ABS (1) ^ SCR_MSG_IN); /* next */
	script_msg_ext[i++]=swap_script(phys_to_bus(&pccb->msgin[7]));
	script_msg_ext[i++]=swap_script(SCR_JUMP ^ IFFALSE (IF (SCR_MSG_IN)));
	script_msg_ext[i++]=swap_script(phys_to_bus(&script_complete[0])); /* no more bytes */
	script_msg_ext[i++]=swap_script(SCR_INT);
	script_msg_ext[i++]=SIR_MSG_OVER7;
#ifdef SCSI_SINGLE_STEP
	start_script_msg_ext=(unsigned long)&script_msg_ext[0];
	len_script_msg_ext=i*4;
#endif
	i=0;
	script_status[i++]=swap_script(SCR_MOVE_ABS (1) ^ SCR_STATUS);
	script_status[i++]=swap_script(phys_to_bus(&pccb->status));
	script_status[i++]=swap_script(SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_IN)));
	script_status[i++]=swap_script(phys_to_bus(&script_msgin[0]));
	script_status[i++]=swap_script(SCR_INT);
	script_status[i++]=SIR_STATUS_ILL_PH;
#ifdef SCSI_SINGLE_STEP
	start_script_status=(unsigned long)&script_status[0];
	len_script_status=i*4;
#endif
	i=0;
	script_complete[i++]=swap_script(SCR_REG_REG (SCNTL2, SCR_AND, 0x7f));
	script_complete[i++]=0;
	script_complete[i++]=swap_script(SCR_CLR (SCR_ACK|SCR_ATN));
	script_complete[i++]=0;
	script_complete[i++]=swap_script(SCR_WAIT_DISC);
	script_complete[i++]=0;
	script_complete[i++]=swap_script(SCR_REG_REG(GPREG, SCR_OR, 0x01));
	script_complete[i++]=0; /* LED OFF */
	script_complete[i++]=swap_script(SCR_INT);
	script_complete[i++]=SIR_COMPLETE;
#ifdef SCSI_SINGLE_STEP
	start_script_complete=(unsigned long)&script_complete[0];
	len_script_complete=i*4;
#endif
	i=0;
	script_error[i++]=swap_script(SCR_INT); /* interrupt if error */
	script_error[i++]=SIR_SCRIPT_ERROR;
#ifdef SCSI_SINGLE_STEP
	start_script_error=(unsigned long)&script_error[0];
	len_script_error=i*4;
#endif
	i=0;
	script_reselection[i++]=swap_script(SCR_CLR (SCR_TRG)); /* target status */
	script_reselection[i++]=0;
	script_reselection[i++]=swap_script(SCR_WAIT_RESEL);
	script_reselection[i++]=swap_script(phys_to_bus(&script_select[0])); /* len = 4 */
#ifdef SCSI_SINGLE_STEP
	start_script_reselection=(unsigned long)&script_reselection[0];
	len_script_reselection=i*4;
#endif
}


void scsi_issue(ccb *pccb)
{
	int busdevfunc = pccb->priv;
	int i;
	unsigned short sstat;
 	int retrycnt;  /* retry counter */
	for(i=0;i<3;i++)
		int_stat[i]=0; /* delete all int status */
	/* struct pccb must be set-up correctly */
	retrycnt=0;
	PRINTF("ID %d issue cmd %02X\n",pccb->target,pccb->cmd[0]);
	pccb->trans_bytes=0; /* no bytes transfered yet */
	scsi_set_script(pccb); /* fill in SCRIPT		*/
	scsi_int_mask=STO | UDC | MA; /* | CMP; / * Interrupts which are enabled */
	script_int_mask=0xff; /* enable all Ints */
	scsi_int_enable();
	scsi_write_dsp(phys_to_bus(&script_select[0])); /* start script */
	/* now we have to wait for IRQs */
retry:
	/*
	 * This version of the driver is _not_ interrupt driven,
	 * but polls the chip's interrupt registers (ISTAT, DSTAT).
	 */
	while(int_stat[0]==0)
		handle_scsi_int();

	if(int_stat[0]==SIR_COMPLETE) {
		if(pccb->msgin[0]==M_DISCONNECT) {
			PRINTF("Wait for reselection\n");
			for(i=0;i<3;i++)
				int_stat[i]=0; /* delete all int status */
			scsi_write_dsp(phys_to_bus(&script_reselection[0])); /* start reselection script */
			goto retry;
		}
		pccb->contr_stat=SIR_COMPLETE;
		return;
	}
	if((int_stat[0] & SCSI_INT_STATE)==SCSI_INT_STATE) { /* scsi interrupt */
		sstat=(unsigned short)int_stat[0];
		if((sstat & STO)==STO) { /* selection timeout */
			pccb->contr_stat=SCSI_SEL_TIME_OUT;
			scsi_write_byte(GPREG,0x01);
			PRINTF("ID: %X Selection Timeout\n",pccb->target);
			return;
		}
		if((sstat & UDC)==UDC) { /* unexpected disconnect */
			pccb->contr_stat=SCSI_UNEXP_DIS;
			scsi_write_byte(GPREG,0x01);
			PRINTF("ID: %X Unexpected Disconnect\n",pccb->target);
			return;
		}
		if((sstat & RSL)==RSL) { /* reselection */
			pccb->contr_stat=SCSI_UNEXP_DIS;
			scsi_write_byte(GPREG,0x01);
			PRINTF("ID: %X Unexpected Disconnect\n",pccb->target);
			return;
		}
		if(((sstat & MA)==MA)||((sstat & HTH)==HTH)) { /* phase missmatch */
			if(retrycnt<SCSI_MAX_RETRY) {
				pccb->trans_bytes=pccb->datalen -
					((unsigned long)scsi_read_byte(DBC) |
					((unsigned long)scsi_read_byte(DBC+1)<<8) |
					((unsigned long)scsi_read_byte(DBC+2)<<16));
				for(i=0;i<3;i++)
					int_stat[i]=0; /* delete all int status */
				retrycnt++;
				PRINTF("ID: %X Phase Missmatch Retry %d Phase %02X transfered %lx\n",
						pccb->target,retrycnt,scsi_read_byte(SBCL),pccb->trans_bytes);
				scsi_write_dsp(phys_to_bus(&script_cmd[4])); /* start retry script */
				goto retry;
			}
			if((sstat & MA)==MA)
				pccb->contr_stat=SCSI_MA_TIME_OUT;
			else
				pccb->contr_stat=SCSI_HNS_TIME_OUT;
			PRINTF("Phase Missmatch stat %lx\n",pccb->contr_stat);
			return;
		} /* no phase int */
/*		if((sstat & CMP)==CMP) {
			pccb->contr_stat=SIR_COMPLETE;
			return;
		}
*/
		PRINTF("SCSI INT %lX\n",int_stat[0]);
		pccb->contr_stat=int_stat[0];
		return;
	} /* end scsi int */
	PRINTF("SCRIPT INT %lX phase %02X\n",int_stat[0],scsi_read_byte(SBCL));
	pccb->contr_stat=int_stat[0];
	return;
}

int scsi_exec(ccb *pccb)
{
	unsigned char tmpcmd[16],tmpstat;
	int i,retrycnt,t;
	unsigned long transbytes,datalen;
	unsigned char *tmpptr;
	retrycnt=0;
retry:
	scsi_issue(pccb);
	if(pccb->contr_stat!=SIR_COMPLETE)
		return FALSE;
	if(pccb->status==S_GOOD)
		return TRUE;
	if(pccb->status==S_CHECK_COND) { /* check condition */
		for(i=0;i<16;i++)
			tmpcmd[i]=pccb->cmd[i];
		pccb->cmd[0]=SCSI_REQ_SENSE;
		pccb->cmd[1]=pccb->lun<<5;
		pccb->cmd[2]=0;
		pccb->cmd[3]=0;
		pccb->cmd[4]=14;
		pccb->cmd[5]=0;
		pccb->cmdlen=6;
		pccb->msgout[0]=SCSI_IDENTIFY;
		transbytes=pccb->trans_bytes;
		tmpptr=pccb->pdata;
		pccb->pdata=&pccb->sense_buf[0];
		datalen=pccb->datalen;
		pccb->datalen=14;
		tmpstat=pccb->status;
		scsi_issue(pccb);
		for(i=0;i<16;i++)
			pccb->cmd[i]=tmpcmd[i];
		pccb->trans_bytes=transbytes;
		pccb->pdata=tmpptr;
		pccb->datalen=datalen;
		pccb->status=tmpstat;
		PRINTF("Request_sense sense key %x ASC %x ASCQ %x\n",pccb->sense_buf[2]&0x0f,
			pccb->sense_buf[12],pccb->sense_buf[13]);
		switch(pccb->sense_buf[2]&0xf) {
			case SENSE_NO_SENSE:
			case SENSE_RECOVERED_ERROR:
				/* seems to be ok */
				return TRUE;
				break;
			case SENSE_NOT_READY:
				if((pccb->sense_buf[12]!=0x04)||(pccb->sense_buf[13]!=0x01)) {
					/* if device is not in process of becoming ready */
					return FALSE;
					break;
				} /* else fall through */
			case SENSE_UNIT_ATTENTION:
				if(retrycnt<SCSI_MAX_RETRY_NOT_READY) {
					PRINTF("Target %d not ready, retry %d\n",pccb->target,retrycnt);
					for(t=0;t<SCSI_NOT_READY_TIME_OUT;t++)
						udelay(1000); /* 1sec wait */
					retrycnt++;
					goto retry;
				}
				PRINTF("Target %d not ready, %d retried\n",pccb->target,retrycnt);
				return FALSE;
			default:
				return FALSE;
		}
	}
	PRINTF("Status = %X\n",pccb->status);
	return FALSE;
}


void scsi_chip_init(void)
{
	/* first we issue a soft reset */
	scsi_write_byte(ISTAT,SRST);
	udelay(1000);
	scsi_write_byte(ISTAT,0);
	/* setup chip */
	scsi_write_byte(SCNTL0,0xC0); /* full arbitration no start, no message, parity disabled, master */
	scsi_write_byte(SCNTL1,0x00);
	scsi_write_byte(SCNTL2,0x00);
#ifndef CFG_SCSI_SYM53C8XX_CCF    /* config value for none 40 mhz clocks */
	scsi_write_byte(SCNTL3,0x13); /* synchronous clock 40/4=10MHz, asynchronous 40MHz */
#else
	scsi_write_byte(SCNTL3,CFG_SCSI_SYM53C8XX_CCF); /* config value for none 40 mhz clocks */
#endif
	scsi_write_byte(SCID,0x47); /* ID=7, enable reselection */
	scsi_write_byte(SXFER,0x00); /* synchronous transfer period 10MHz, asynchronous */
	scsi_write_byte(SDID,0x00);  /* targed SCSI ID = 0 */
	scsi_int_mask=0x0000; /* no Interrupt is enabled */
	script_int_mask=0x00;
	scsi_int_enable();
	scsi_write_byte(GPREG,0x01); /* GPIO0 is LED (off) */
	scsi_write_byte(GPCNTL,0x0E); /* GPIO0 is Output */
	scsi_write_byte(STIME0,0x08); /* handshake timer disabled, selection timeout 512msec */
	scsi_write_byte(RESPID,0x80); /* repond only to the own ID (reselection) */
	scsi_write_byte(STEST1,0x00); /* not isolated, SCLK is used */
	scsi_write_byte(STEST2,0x00); /* no Lowlevel Mode? */
	scsi_write_byte(STEST3,0x80); /* enable tolerANT */
	scsi_write_byte(CTEST3,0x04); /* clear FIFO */
	scsi_write_byte(CTEST4,0x00);
	scsi_write_byte(CTEST5,0x00);
#ifdef SCSI_SINGLE_STEP
/*	scsi_write_byte(DCNTL,IRQM | SSM);	*/
	scsi_write_byte(DCNTL,IRQD | SSM);
	scsi_write_byte(DMODE,MAN);
#else
/*	scsi_write_byte(DCNTL,IRQM);	*/
	scsi_write_byte(DCNTL,IRQD);
	scsi_write_byte(DMODE,0x00);
#endif
}
#endif /* (CONFIG_COMMANDS & CFG_CMD_SCSI) */


#endif /* CONFIG_SCSI_SYM53C8XX */