summaryrefslogtreecommitdiff
path: root/drivers/scsi/mac_scsi.c
blob: 92d2c8379abf529989afd58f10976aedb901d325 (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
/*
 * Generic Macintosh NCR5380 driver
 *
 * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
 *
 * derived in part from:
 */
/*
 * Generic Generic NCR5380 driver
 *
 * Copyright 1995, Russell King
 *
 * ALPHA RELEASE 1.
 *
 * For more information, please consult
 *
 * NCR 5380 Family
 * SCSI Protocol Controller
 * Databook
 *
 * NCR Microelectronics
 * 1635 Aeroplaza Drive
 * Colorado Springs, CO 80916
 * 1+ (719) 578-3400
 * 1+ (800) 334-5454
 */

/*
 * $Log: mac_NCR5380.c,v $
 */

#include <linux/types.h>
#include <linux/stddef.h>
#include <linux/ctype.h>
#include <linux/delay.h>

#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/interrupt.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>

#include <asm/macintosh.h>
#include <asm/macints.h>
#include <asm/machw.h>
#include <asm/mac_via.h>

#include "scsi.h"
#include <scsi/scsi_host.h>
#include "mac_scsi.h"
#include "NCR5380.h"

#if 0
#define NDEBUG (NDEBUG_INTR | NDEBUG_PSEUDO_DMA | NDEBUG_ARBITRATION | NDEBUG_SELECTION | NDEBUG_RESELECTION)
#else
#define NDEBUG (NDEBUG_ABORT)
#endif

#define RESET_BOOT
#define DRIVER_SETUP

#define	ENABLE_IRQ()	mac_enable_irq( IRQ_MAC_SCSI ); 
#define	DISABLE_IRQ()	mac_disable_irq( IRQ_MAC_SCSI );

extern void via_scsi_clear(void);

#ifdef RESET_BOOT
static void mac_scsi_reset_boot(struct Scsi_Host *instance);
#endif

static int setup_called = 0;
static int setup_can_queue = -1;
static int setup_cmd_per_lun = -1;
static int setup_sg_tablesize = -1;
static int setup_use_pdma = -1;
#ifdef SUPPORT_TAGS
static int setup_use_tagged_queuing = -1;
#endif
static int setup_hostid = -1;

/* Time (in jiffies) to wait after a reset; the SCSI standard calls for 250ms,
 * we usually do 0.5s to be on the safe side. But Toshiba CD-ROMs once more
 * need ten times the standard value... */
#define TOSHIBA_DELAY

#ifdef TOSHIBA_DELAY
#define	AFTER_RESET_DELAY	(5*HZ/2)
#else
#define	AFTER_RESET_DELAY	(HZ/2)
#endif

static volatile unsigned char *mac_scsi_regp = NULL;
static volatile unsigned char *mac_scsi_drq  = NULL;
static volatile unsigned char *mac_scsi_nodrq = NULL;


/*
 * NCR 5380 register access functions
 */

#if 0
/* Debug versions */
#define CTRL(p,v) (*ctrl = (v))

static char macscsi_read(struct Scsi_Host *instance, int reg)
{
  int iobase = instance->io_port;
  int i;
  int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;

  CTRL(iobase, 0);
  i = in_8(iobase + (reg<<4));
  CTRL(iobase, 0x40);

  return i;
}

static void macscsi_write(struct Scsi_Host *instance, int reg, int value)
{
  int iobase = instance->io_port;
  int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;

  CTRL(iobase, 0);
  out_8(iobase + (reg<<4), value);
  CTRL(iobase, 0x40);
}
#else

/* Fast versions */
static __inline__ char macscsi_read(struct Scsi_Host *instance, int reg)
{
  return in_8(instance->io_port + (reg<<4));
}

static __inline__ void macscsi_write(struct Scsi_Host *instance, int reg, int value)
{
  out_8(instance->io_port + (reg<<4), value);
}
#endif


/*
 * Function : mac_scsi_setup(char *str)
 *
 * Purpose : booter command line initialization of the overrides array,
 *
 * Inputs : str - comma delimited list of options
 *
 */

static int __init mac_scsi_setup(char *str) {
#ifdef DRIVER_SETUP	
	int ints[7];
	
	(void)get_options( str, ARRAY_SIZE(ints), ints);
	
	if (setup_called++ || ints[0] < 1 || ints[0] > 6) {
	    printk(KERN_WARNING "scsi: <mac5380>"
		" Usage: mac5380=<can_queue>[,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>,<use_pdma>]\n");
	    printk(KERN_ALERT "scsi: <mac5380> Bad Penguin parameters?\n");
	    return 0;
	}
	    
	if (ints[0] >= 1) {
		if (ints[1] > 0)
			/* no limits on this, just > 0 */
			setup_can_queue = ints[1];
	}
	if (ints[0] >= 2) {
		if (ints[2] > 0)
			setup_cmd_per_lun = ints[2];
	}
	if (ints[0] >= 3) {
		if (ints[3] >= 0) {
			setup_sg_tablesize = ints[3];
			/* Must be <= SG_ALL (255) */
			if (setup_sg_tablesize > SG_ALL)
				setup_sg_tablesize = SG_ALL;
		}
	}
	if (ints[0] >= 4) {
		/* Must be between 0 and 7 */
		if (ints[4] >= 0 && ints[4] <= 7)
			setup_hostid = ints[4];
		else if (ints[4] > 7)
			printk(KERN_WARNING "mac_scsi_setup: invalid host ID %d !\n", ints[4] );
	}
#ifdef SUPPORT_TAGS	
	if (ints[0] >= 5) {
		if (ints[5] >= 0)
			setup_use_tagged_queuing = !!ints[5];
	}
	
	if (ints[0] == 6) {
	    if (ints[6] >= 0)
		setup_use_pdma = ints[6];
	}
#else
	if (ints[0] == 5) {
	    if (ints[5] >= 0)
		setup_use_pdma = ints[5];
	}
#endif /* SUPPORT_TAGS */
	
#endif /* DRIVER_SETUP */
	return 1;
}

__setup("mac5380=", mac_scsi_setup);

/*
 * If you want to find the instance with (k)gdb ...
 */
#if NDEBUG
static struct Scsi_Host *default_instance;
#endif

/*
 * Function : int macscsi_detect(Scsi_Host_Template * tpnt)
 *
 * Purpose : initializes mac NCR5380 driver based on the
 *	command line / compile time port and irq definitions.
 *
 * Inputs : tpnt - template for this SCSI adapter.
 *
 * Returns : 1 if a host adapter was found, 0 if not.
 *
 */
 
int macscsi_detect(Scsi_Host_Template * tpnt)
{
    static int called = 0;
    int flags = 0;
    struct Scsi_Host *instance;

    if (!MACH_IS_MAC || called)
	return( 0 );

    if (macintosh_config->scsi_type != MAC_SCSI_OLD)
	return( 0 );

    /* setup variables */
    tpnt->can_queue =
	(setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
    tpnt->cmd_per_lun =
	(setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
    tpnt->sg_tablesize = 
	(setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;

    if (setup_hostid >= 0)
	tpnt->this_id = setup_hostid;
    else {
	/* use 7 as default */
	tpnt->this_id = 7;
    }

#ifdef SUPPORT_TAGS
    if (setup_use_tagged_queuing < 0)
	setup_use_tagged_queuing = USE_TAGGED_QUEUING;
#endif

    /* Once we support multiple 5380s (e.g. DuoDock) we'll do
       something different here */
    instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
#if NDEBUG
    default_instance = instance;
#endif
    
    if (macintosh_config->ident == MAC_MODEL_IIFX) {
	mac_scsi_regp  = via1+0x8000;
	mac_scsi_drq   = via1+0xE000;
	mac_scsi_nodrq = via1+0xC000;
	/* The IIFX should be able to do true DMA, but pseudo-dma doesn't work */
	flags = FLAG_NO_PSEUDO_DMA;
    } else {
	mac_scsi_regp  = via1+0x10000;
	mac_scsi_drq   = via1+0x6000;
	mac_scsi_nodrq = via1+0x12000;
    }

    if (! setup_use_pdma)
	flags = FLAG_NO_PSEUDO_DMA;
	
    instance->io_port = (unsigned long) mac_scsi_regp;
    instance->irq = IRQ_MAC_SCSI;

#ifdef RESET_BOOT   
    mac_scsi_reset_boot(instance);
#endif
    
    NCR5380_init(instance, flags);

    instance->n_io_port = 255;

    ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;

    if (instance->irq != SCSI_IRQ_NONE)
	if (request_irq(instance->irq, NCR5380_intr, IRQ_FLG_SLOW, 
		"ncr5380", instance)) {
	    printk(KERN_WARNING "scsi%d: IRQ%d not free, interrupts disabled\n",
		   instance->host_no, instance->irq);
	    instance->irq = SCSI_IRQ_NONE;
	}

    printk(KERN_INFO "scsi%d: generic 5380 at port %lX irq", instance->host_no, instance->io_port);
    if (instance->irq == SCSI_IRQ_NONE)
	printk (KERN_INFO "s disabled");
    else
	printk (KERN_INFO " %d", instance->irq);
    printk(KERN_INFO " options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
	   instance->can_queue, instance->cmd_per_lun, MACSCSI_PUBLIC_RELEASE);
    printk(KERN_INFO "\nscsi%d:", instance->host_no);
    NCR5380_print_options(instance);
    printk("\n");
    called = 1;
    return 1;
}

int macscsi_release (struct Scsi_Host *shpnt)
{
	if (shpnt->irq != SCSI_IRQ_NONE)
		free_irq (shpnt->irq, NCR5380_intr);
	NCR5380_exit(shpnt);

	return 0;
}

#ifdef RESET_BOOT
/*
 * Our 'bus reset on boot' function
 */

static void mac_scsi_reset_boot(struct Scsi_Host *instance)
{
	unsigned long end;

	NCR5380_local_declare();
	NCR5380_setup(instance);
	
	/*
	 * Do a SCSI reset to clean up the bus during initialization. No messing
	 * with the queues, interrupts, or locks necessary here.
	 */

	printk(KERN_INFO "Macintosh SCSI: resetting the SCSI bus..." );

	/* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
	mac_disable_irq(IRQ_MAC_SCSI);

	/* get in phase */
	NCR5380_write( TARGET_COMMAND_REG,
		      PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));

	/* assert RST */
	NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
	/* The min. reset hold time is 25us, so 40us should be enough */
	udelay( 50 );
	/* reset RST and interrupt */
	NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
	NCR5380_read( RESET_PARITY_INTERRUPT_REG );

	for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
		barrier();

	/* switch on SCSI IRQ again */
	mac_enable_irq(IRQ_MAC_SCSI);

	printk(KERN_INFO " done\n" );
}
#endif

const char * macscsi_info (struct Scsi_Host *spnt) {
	return "";
}

/* 
   Pseudo-DMA: (Ove Edlund)
   The code attempts to catch bus errors that occur if one for example
   "trips over the cable".
   XXX: Since bus errors in the PDMA routines never happen on my 
   computer, the bus error code is untested. 
   If the code works as intended, a bus error results in Pseudo-DMA 
   beeing disabled, meaning that the driver switches to slow handshake. 
   If bus errors are NOT extremely rare, this has to be changed. 
*/

#define CP_IO_TO_MEM(s,d,len)				\
__asm__ __volatile__					\
    ("    cmp.w  #4,%2\n"				\
     "    bls    8f\n"					\
     "    move.w %1,%%d0\n"				\
     "    neg.b  %%d0\n"				\
     "    and.w  #3,%%d0\n"				\
     "    sub.w  %%d0,%2\n"				\
     "    bra    2f\n"					\
     " 1: move.b (%0),(%1)+\n"				\
     " 2: dbf    %%d0,1b\n"				\
     "    move.w %2,%%d0\n"				\
     "    lsr.w  #5,%%d0\n"				\
     "    bra    4f\n"					\
     " 3: move.l (%0),(%1)+\n"				\
     "31: move.l (%0),(%1)+\n"				\
     "32: move.l (%0),(%1)+\n"				\
     "33: move.l (%0),(%1)+\n"				\
     "34: move.l (%0),(%1)+\n"				\
     "35: move.l (%0),(%1)+\n"				\
     "36: move.l (%0),(%1)+\n"				\
     "37: move.l (%0),(%1)+\n"				\
     " 4: dbf    %%d0,3b\n"				\
     "    move.w %2,%%d0\n"				\
     "    lsr.w  #2,%%d0\n"				\
     "    and.w  #7,%%d0\n"				\
     "    bra    6f\n"					\
     " 5: move.l (%0),(%1)+\n"				\
     " 6: dbf    %%d0,5b\n"				\
     "    and.w  #3,%2\n"				\
     "    bra    8f\n"					\
     " 7: move.b (%0),(%1)+\n"				\
     " 8: dbf    %2,7b\n"				\
     "    moveq.l #0, %2\n"				\
     " 9: \n"						\
     ".section .fixup,\"ax\"\n"				\
     "    .even\n"					\
     "90: moveq.l #1, %2\n"				\
     "    jra 9b\n"					\
     ".previous\n"					\
     ".section __ex_table,\"a\"\n"			\
     "   .align 4\n"					\
     "   .long  1b,90b\n"				\
     "   .long  3b,90b\n"				\
     "   .long 31b,90b\n"				\
     "   .long 32b,90b\n"				\
     "   .long 33b,90b\n"				\
     "   .long 34b,90b\n"				\
     "   .long 35b,90b\n"				\
     "   .long 36b,90b\n"				\
     "   .long 37b,90b\n"				\
     "   .long  5b,90b\n"				\
     "   .long  7b,90b\n"				\
     ".previous"					\
     : "=a"(s), "=a"(d), "=d"(len)			\
     : "0"(s), "1"(d), "2"(len)				\
     : "d0")


static int macscsi_pread (struct Scsi_Host *instance,
			  unsigned char *dst, int len)
{
   unsigned char *d;
   volatile unsigned char *s;

   NCR5380_local_declare();
   NCR5380_setup(instance);

   s = mac_scsi_drq+0x60;
   d = dst;

/* These conditions are derived from MacOS */

   while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) 
         && !(NCR5380_read(STATUS_REG) & SR_REQ))
      ;
   if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) 
         && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) {
      printk(KERN_ERR "Error in macscsi_pread\n");
      return -1;
   }

   CP_IO_TO_MEM(s, d, len);
   
   if (len != 0) {
      printk(KERN_NOTICE "Bus error in macscsi_pread\n");
      return -1;
   }
   
   return 0;
}


#define CP_MEM_TO_IO(s,d,len)				\
__asm__ __volatile__					\
    ("    cmp.w  #4,%2\n"				\
     "    bls    8f\n"					\
     "    move.w %0,%%d0\n"				\
     "    neg.b  %%d0\n"				\
     "    and.w  #3,%%d0\n"				\
     "    sub.w  %%d0,%2\n"				\
     "    bra    2f\n"					\
     " 1: move.b (%0)+,(%1)\n"				\
     " 2: dbf    %%d0,1b\n"				\
     "    move.w %2,%%d0\n"				\
     "    lsr.w  #5,%%d0\n"				\
     "    bra    4f\n"					\
     " 3: move.l (%0)+,(%1)\n"				\
     "31: move.l (%0)+,(%1)\n"				\
     "32: move.l (%0)+,(%1)\n"				\
     "33: move.l (%0)+,(%1)\n"				\
     "34: move.l (%0)+,(%1)\n"				\
     "35: move.l (%0)+,(%1)\n"				\
     "36: move.l (%0)+,(%1)\n"				\
     "37: move.l (%0)+,(%1)\n"				\
     " 4: dbf    %%d0,3b\n"				\
     "    move.w %2,%%d0\n"				\
     "    lsr.w  #2,%%d0\n"				\
     "    and.w  #7,%%d0\n"				\
     "    bra    6f\n"					\
     " 5: move.l (%0)+,(%1)\n"				\
     " 6: dbf    %%d0,5b\n"				\
     "    and.w  #3,%2\n"				\
     "    bra    8f\n"					\
     " 7: move.b (%0)+,(%1)\n"				\
     " 8: dbf    %2,7b\n"				\
     "    moveq.l #0, %2\n"				\
     " 9: \n"						\
     ".section .fixup,\"ax\"\n"				\
     "    .even\n"					\
     "90: moveq.l #1, %2\n"				\
     "    jra 9b\n"					\
     ".previous\n"					\
     ".section __ex_table,\"a\"\n"			\
     "   .align 4\n"					\
     "   .long  1b,90b\n"				\
     "   .long  3b,90b\n"				\
     "   .long 31b,90b\n"				\
     "   .long 32b,90b\n"				\
     "   .long 33b,90b\n"				\
     "   .long 34b,90b\n"				\
     "   .long 35b,90b\n"				\
     "   .long 36b,90b\n"				\
     "   .long 37b,90b\n"				\
     "   .long  5b,90b\n"				\
     "   .long  7b,90b\n"				\
     ".previous"					\
     : "=a"(s), "=a"(d), "=d"(len)			\
     : "0"(s), "1"(d), "2"(len)				\
     : "d0")

static int macscsi_pwrite (struct Scsi_Host *instance,
				  unsigned char *src, int len)
{
   unsigned char *s;
   volatile unsigned char *d;

   NCR5380_local_declare();
   NCR5380_setup(instance);

   s = src;
   d = mac_scsi_drq;
   
/* These conditions are derived from MacOS */

   while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) 
         && (!(NCR5380_read(STATUS_REG) & SR_REQ) 
            || (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH))) 
      ;
   if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)) {
      printk(KERN_ERR "Error in macscsi_pwrite\n");
      return -1;
   }

   CP_MEM_TO_IO(s, d, len);   

   if (len != 0) {
      printk(KERN_NOTICE "Bus error in macscsi_pwrite\n");
      return -1;
   }
   
   return 0;
}


/* These control the behaviour of the generic 5380 core */
#define AUTOSENSE
#define PSEUDO_DMA

#include "NCR5380.c"

static Scsi_Host_Template driver_template = {
	.proc_name			= "Mac5380",
	.proc_info			= macscsi_proc_info,
	.name				= "Macintosh NCR5380 SCSI",
	.detect				= macscsi_detect,
	.release			= macscsi_release,
	.info				= macscsi_info,
	.queuecommand			= macscsi_queue_command,
	.eh_abort_handler		= macscsi_abort,
	.eh_bus_reset_handler		= macscsi_bus_reset,
	.can_queue			= CAN_QUEUE,
	.this_id			= 7,
	.sg_tablesize			= SG_ALL,
	.cmd_per_lun			= CMD_PER_LUN,
	.unchecked_isa_dma		= 0,
	.use_clustering			= DISABLE_CLUSTERING
};


#include "scsi_module.c"