summaryrefslogblamecommitdiff
path: root/drivers/scsi/qlogicpti.c
blob: 5b2f0741a55b841f06ad6dc93e9eba81dd809e27 (plain) (tree)
1
2
3
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

                                                                    
                                                                 






















                                                                    
                          

















                             


                           








                                                     








































































                                                            
                                                      












































































































































































































































































































































































































































































































































































































                                                                                       
                                                         

                          
                                                            

























































































                                                                               




                                                                     

                                                                  



























                                                                              
                                                                                     

























                                                                               
                                                                 









































































                                                                                              





























                                                                                 

























                                                                                   
                                             
 
                                                            












                                                                            


                                                 





























































































































































































































































                                                                                            
                                                                                 





































































































                                                                                        


                                                  










                                                                            







































































































































































                                                                                             
 








                                                                     
 

                                                       
                      
                      
 

                       
/* qlogicpti.c: Performance Technologies QlogicISP sbus card driver.
 *
 * Copyright (C) 1996, 2006 David S. Miller (davem@davemloft.net)
 *
 * A lot of this driver was directly stolen from Erik H. Moe's PCI
 * Qlogic ISP driver.  Mucho kudos to him for this code.
 *
 * An even bigger kudos to John Grana at Performance Technologies
 * for providing me with the hardware to write this driver, you rule
 * John you really do.
 *
 * May, 2, 1997: Added support for QLGC,isp --jj
 */

#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/jiffies.h>

#include <asm/byteorder.h>

#include "qlogicpti.h"

#include <asm/sbus.h>
#include <asm/dma.h>
#include <asm/system.h>
#include <asm/ptrace.h>
#include <asm/pgtable.h>
#include <asm/oplib.h>
#include <asm/io.h>
#include <asm/irq.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_host.h>

#define MAX_TARGETS	16
#define MAX_LUNS	8	/* 32 for 1.31 F/W */

#define DEFAULT_LOOP_COUNT	10000

#include "qlogicpti_asm.c"

static struct qlogicpti *qptichain = NULL;
static DEFINE_SPINLOCK(qptichain_lock);

#define PACKB(a, b)			(((a)<<4)|(b))

static const u_char mbox_param[] = {
	PACKB(1, 1),	/* MBOX_NO_OP */
	PACKB(5, 5),	/* MBOX_LOAD_RAM */
	PACKB(2, 0),	/* MBOX_EXEC_FIRMWARE */
	PACKB(5, 5),	/* MBOX_DUMP_RAM */
	PACKB(3, 3),	/* MBOX_WRITE_RAM_WORD */
	PACKB(2, 3),	/* MBOX_READ_RAM_WORD */
	PACKB(6, 6),	/* MBOX_MAILBOX_REG_TEST */
	PACKB(2, 3),	/* MBOX_VERIFY_CHECKSUM	*/
	PACKB(1, 3),	/* MBOX_ABOUT_FIRMWARE */
	PACKB(0, 0),	/* 0x0009 */
	PACKB(0, 0),	/* 0x000a */
	PACKB(0, 0),	/* 0x000b */
	PACKB(0, 0),	/* 0x000c */
	PACKB(0, 0),	/* 0x000d */
	PACKB(1, 2),	/* MBOX_CHECK_FIRMWARE */
	PACKB(0, 0),	/* 0x000f */
	PACKB(5, 5),	/* MBOX_INIT_REQ_QUEUE */
	PACKB(6, 6),	/* MBOX_INIT_RES_QUEUE */
	PACKB(4, 4),	/* MBOX_EXECUTE_IOCB */
	PACKB(2, 2),	/* MBOX_WAKE_UP	*/
	PACKB(1, 6),	/* MBOX_STOP_FIRMWARE */
	PACKB(4, 4),	/* MBOX_ABORT */
	PACKB(2, 2),	/* MBOX_ABORT_DEVICE */
	PACKB(3, 3),	/* MBOX_ABORT_TARGET */
	PACKB(2, 2),	/* MBOX_BUS_RESET */
	PACKB(2, 3),	/* MBOX_STOP_QUEUE */
	PACKB(2, 3),	/* MBOX_START_QUEUE */
	PACKB(2, 3),	/* MBOX_SINGLE_STEP_QUEUE */
	PACKB(2, 3),	/* MBOX_ABORT_QUEUE */
	PACKB(2, 4),	/* MBOX_GET_DEV_QUEUE_STATUS */
	PACKB(0, 0),	/* 0x001e */
	PACKB(1, 3),	/* MBOX_GET_FIRMWARE_STATUS */
	PACKB(1, 2),	/* MBOX_GET_INIT_SCSI_ID */
	PACKB(1, 2),	/* MBOX_GET_SELECT_TIMEOUT */
	PACKB(1, 3),	/* MBOX_GET_RETRY_COUNT	*/
	PACKB(1, 2),	/* MBOX_GET_TAG_AGE_LIMIT */
	PACKB(1, 2),	/* MBOX_GET_CLOCK_RATE */
	PACKB(1, 2),	/* MBOX_GET_ACT_NEG_STATE */
	PACKB(1, 2),	/* MBOX_GET_ASYNC_DATA_SETUP_TIME */
	PACKB(1, 3),	/* MBOX_GET_SBUS_PARAMS */
	PACKB(2, 4),	/* MBOX_GET_TARGET_PARAMS */
	PACKB(2, 4),	/* MBOX_GET_DEV_QUEUE_PARAMS */
	PACKB(0, 0),	/* 0x002a */
	PACKB(0, 0),	/* 0x002b */
	PACKB(0, 0),	/* 0x002c */
	PACKB(0, 0),	/* 0x002d */
	PACKB(0, 0),	/* 0x002e */
	PACKB(0, 0),	/* 0x002f */
	PACKB(2, 2),	/* MBOX_SET_INIT_SCSI_ID */
	PACKB(2, 2),	/* MBOX_SET_SELECT_TIMEOUT */
	PACKB(3, 3),	/* MBOX_SET_RETRY_COUNT	*/
	PACKB(2, 2),	/* MBOX_SET_TAG_AGE_LIMIT */
	PACKB(2, 2),	/* MBOX_SET_CLOCK_RATE */
	PACKB(2, 2),	/* MBOX_SET_ACTIVE_NEG_STATE */
	PACKB(2, 2),	/* MBOX_SET_ASYNC_DATA_SETUP_TIME */
	PACKB(3, 3),	/* MBOX_SET_SBUS_CONTROL_PARAMS */
	PACKB(4, 4),	/* MBOX_SET_TARGET_PARAMS */
	PACKB(4, 4),	/* MBOX_SET_DEV_QUEUE_PARAMS */
	PACKB(0, 0),	/* 0x003a */
	PACKB(0, 0),	/* 0x003b */
	PACKB(0, 0),	/* 0x003c */
	PACKB(0, 0),	/* 0x003d */
	PACKB(0, 0),	/* 0x003e */
	PACKB(0, 0),	/* 0x003f */
	PACKB(0, 0),	/* 0x0040 */
	PACKB(0, 0),	/* 0x0041 */
	PACKB(0, 0)	/* 0x0042 */
};

#define MAX_MBOX_COMMAND	ARRAY_SIZE(mbox_param)

/* queue length's _must_ be power of two: */
#define QUEUE_DEPTH(in, out, ql)	((in - out) & (ql))
#define REQ_QUEUE_DEPTH(in, out)	QUEUE_DEPTH(in, out, 		     \
						    QLOGICPTI_REQ_QUEUE_LEN)
#define RES_QUEUE_DEPTH(in, out)	QUEUE_DEPTH(in, out, RES_QUEUE_LEN)

static inline void qlogicpti_enable_irqs(struct qlogicpti *qpti)
{
	sbus_writew(SBUS_CTRL_ERIRQ | SBUS_CTRL_GENAB,
		    qpti->qregs + SBUS_CTRL);
}

static inline void qlogicpti_disable_irqs(struct qlogicpti *qpti)
{
	sbus_writew(0, qpti->qregs + SBUS_CTRL);
}

static inline void set_sbus_cfg1(struct qlogicpti *qpti)
{
	u16 val;
	u8 bursts = qpti->bursts;

#if 0	/* It appears that at least PTI cards do not support
	 * 64-byte bursts and that setting the B64 bit actually
	 * is a nop and the chip ends up using the smallest burst
	 * size. -DaveM
	 */
	if (sbus_can_burst64(qpti->sdev) && (bursts & DMA_BURST64)) {
		val = (SBUS_CFG1_BENAB | SBUS_CFG1_B64);
	} else
#endif
	if (bursts & DMA_BURST32) {
		val = (SBUS_CFG1_BENAB | SBUS_CFG1_B32);
	} else if (bursts & DMA_BURST16) {
		val = (SBUS_CFG1_BENAB | SBUS_CFG1_B16);
	} else if (bursts & DMA_BURST8) {
		val = (SBUS_CFG1_BENAB | SBUS_CFG1_B8);
	} else {
		val = 0; /* No sbus bursts for you... */
	}
	sbus_writew(val, qpti->qregs + SBUS_CFG1);
}

static int qlogicpti_mbox_command(struct qlogicpti *qpti, u_short param[], int force)
{
	int loop_count;
	u16 tmp;

	if (mbox_param[param[0]] == 0)
		return 1;

	/* Set SBUS semaphore. */
	tmp = sbus_readw(qpti->qregs + SBUS_SEMAPHORE);
	tmp |= SBUS_SEMAPHORE_LCK;
	sbus_writew(tmp, qpti->qregs + SBUS_SEMAPHORE);

	/* Wait for host IRQ bit to clear. */
	loop_count = DEFAULT_LOOP_COUNT;
	while (--loop_count && (sbus_readw(qpti->qregs + HCCTRL) & HCCTRL_HIRQ)) {
		barrier();
		cpu_relax();
	}
	if (!loop_count)
		printk(KERN_EMERG "qlogicpti: mbox_command loop timeout #1\n");

	/* Write mailbox command registers. */
	switch (mbox_param[param[0]] >> 4) {
	case 6: sbus_writew(param[5], qpti->qregs + MBOX5);
	case 5: sbus_writew(param[4], qpti->qregs + MBOX4);
	case 4: sbus_writew(param[3], qpti->qregs + MBOX3);
	case 3: sbus_writew(param[2], qpti->qregs + MBOX2);
	case 2: sbus_writew(param[1], qpti->qregs + MBOX1);
	case 1: sbus_writew(param[0], qpti->qregs + MBOX0);
	}

	/* Clear RISC interrupt. */
	tmp = sbus_readw(qpti->qregs + HCCTRL);
	tmp |= HCCTRL_CRIRQ;
	sbus_writew(tmp, qpti->qregs + HCCTRL);

	/* Clear SBUS semaphore. */
	sbus_writew(0, qpti->qregs + SBUS_SEMAPHORE);

	/* Set HOST interrupt. */
	tmp = sbus_readw(qpti->qregs + HCCTRL);
	tmp |= HCCTRL_SHIRQ;
	sbus_writew(tmp, qpti->qregs + HCCTRL);

	/* Wait for HOST interrupt clears. */
	loop_count = DEFAULT_LOOP_COUNT;
	while (--loop_count &&
	       (sbus_readw(qpti->qregs + HCCTRL) & HCCTRL_CRIRQ))
		udelay(20);
	if (!loop_count)
		printk(KERN_EMERG "qlogicpti: mbox_command[%04x] loop timeout #2\n",
		       param[0]);

	/* Wait for SBUS semaphore to get set. */
	loop_count = DEFAULT_LOOP_COUNT;
	while (--loop_count &&
	       !(sbus_readw(qpti->qregs + SBUS_SEMAPHORE) & SBUS_SEMAPHORE_LCK)) {
		udelay(20);

		/* Workaround for some buggy chips. */
		if (sbus_readw(qpti->qregs + MBOX0) & 0x4000)
			break;
	}
	if (!loop_count)
		printk(KERN_EMERG "qlogicpti: mbox_command[%04x] loop timeout #3\n",
		       param[0]);

	/* Wait for MBOX busy condition to go away. */
	loop_count = DEFAULT_LOOP_COUNT;
	while (--loop_count && (sbus_readw(qpti->qregs + MBOX0) == 0x04))
		udelay(20);
	if (!loop_count)
		printk(KERN_EMERG "qlogicpti: mbox_command[%04x] loop timeout #4\n",
		       param[0]);

	/* Read back output parameters. */
	switch (mbox_param[param[0]] & 0xf) {
	case 6: param[5] = sbus_readw(qpti->qregs + MBOX5);
	case 5: param[4] = sbus_readw(qpti->qregs + MBOX4);
	case 4: param[3] = sbus_readw(qpti->qregs + MBOX3);
	case 3: param[2] = sbus_readw(qpti->qregs + MBOX2);
	case 2: param[1] = sbus_readw(qpti->qregs + MBOX1);
	case 1: param[0] = sbus_readw(qpti->qregs + MBOX0);
	}

	/* Clear RISC interrupt. */
	tmp = sbus_readw(qpti->qregs + HCCTRL);
	tmp |= HCCTRL_CRIRQ;
	sbus_writew(tmp, qpti->qregs + HCCTRL);

	/* Release SBUS semaphore. */
	tmp = sbus_readw(qpti->qregs + SBUS_SEMAPHORE);
	tmp &= ~(SBUS_SEMAPHORE_LCK);
	sbus_writew(tmp, qpti->qregs + SBUS_SEMAPHORE);

	/* We're done. */
	return 0;
}

static inline void qlogicpti_set_hostdev_defaults(struct qlogicpti *qpti)
{
	int i;

	qpti->host_param.initiator_scsi_id = qpti->scsi_id;
	qpti->host_param.bus_reset_delay = 3;
	qpti->host_param.retry_count = 0;
	qpti->host_param.retry_delay = 5;
	qpti->host_param.async_data_setup_time = 3;
	qpti->host_param.req_ack_active_negation = 1;
	qpti->host_param.data_line_active_negation = 1;
	qpti->host_param.data_dma_burst_enable = 1;
	qpti->host_param.command_dma_burst_enable = 1;
	qpti->host_param.tag_aging = 8;
	qpti->host_param.selection_timeout = 250;
	qpti->host_param.max_queue_depth = 256;

	for(i = 0; i < MAX_TARGETS; i++) {
		/*
		 * disconnect, parity, arq, reneg on reset, and, oddly enough
		 * tags...the midlayer's notion of tagged support has to match
		 * our device settings, and since we base whether we enable a
		 * tag on a  per-cmnd basis upon what the midlayer sez, we
		 * actually enable the capability here.
		 */
		qpti->dev_param[i].device_flags = 0xcd;
		qpti->dev_param[i].execution_throttle = 16;
		if (qpti->ultra) {
			qpti->dev_param[i].synchronous_period = 12;
			qpti->dev_param[i].synchronous_offset = 8;
		} else {
			qpti->dev_param[i].synchronous_period = 25;
			qpti->dev_param[i].synchronous_offset = 12;
		}
		qpti->dev_param[i].device_enable = 1;
	}
	/* this is very important to set! */
	qpti->sbits = 1 << qpti->scsi_id;
}

static int qlogicpti_reset_hardware(struct Scsi_Host *host)
{
	struct qlogicpti *qpti = (struct qlogicpti *) host->hostdata;
	u_short param[6];
	unsigned short risc_code_addr;
	int loop_count, i;
	unsigned long flags;

	risc_code_addr = 0x1000;	/* all load addresses are at 0x1000 */

	spin_lock_irqsave(host->host_lock, flags);

	sbus_writew(HCCTRL_PAUSE, qpti->qregs + HCCTRL);

	/* Only reset the scsi bus if it is not free. */
	if (sbus_readw(qpti->qregs + CPU_PCTRL) & CPU_PCTRL_BSY) {
		sbus_writew(CPU_ORIDE_RMOD, qpti->qregs + CPU_ORIDE);
		sbus_writew(CPU_CMD_BRESET, qpti->qregs + CPU_CMD);
		udelay(400);
	}

	sbus_writew(SBUS_CTRL_RESET, qpti->qregs + SBUS_CTRL);
	sbus_writew((DMA_CTRL_CCLEAR | DMA_CTRL_CIRQ), qpti->qregs + CMD_DMA_CTRL);
	sbus_writew((DMA_CTRL_CCLEAR | DMA_CTRL_CIRQ), qpti->qregs + DATA_DMA_CTRL);

	loop_count = DEFAULT_LOOP_COUNT;
	while (--loop_count && ((sbus_readw(qpti->qregs + MBOX0) & 0xff) == 0x04))
		udelay(20);
	if (!loop_count)
		printk(KERN_EMERG "qlogicpti: reset_hardware loop timeout\n");

	sbus_writew(HCCTRL_PAUSE, qpti->qregs + HCCTRL);
	set_sbus_cfg1(qpti);
	qlogicpti_enable_irqs(qpti);

	if (sbus_readw(qpti->qregs + RISC_PSR) & RISC_PSR_ULTRA) {
		qpti->ultra = 1;
		sbus_writew((RISC_MTREG_P0ULTRA | RISC_MTREG_P1ULTRA),
			    qpti->qregs + RISC_MTREG);
	} else {
		qpti->ultra = 0;
		sbus_writew((RISC_MTREG_P0DFLT | RISC_MTREG_P1DFLT),
			    qpti->qregs + RISC_MTREG);
	}

	/* reset adapter and per-device default values. */
	/* do it after finding out whether we're ultra mode capable */
	qlogicpti_set_hostdev_defaults(qpti);

	/* Release the RISC processor. */
	sbus_writew(HCCTRL_REL, qpti->qregs + HCCTRL);

	/* Get RISC to start executing the firmware code. */
	param[0] = MBOX_EXEC_FIRMWARE;
	param[1] = risc_code_addr;
	if (qlogicpti_mbox_command(qpti, param, 1)) {
		printk(KERN_EMERG "qlogicpti%d: Cannot execute ISP firmware.\n",
		       qpti->qpti_id);
		spin_unlock_irqrestore(host->host_lock, flags);
		return 1;
	}

	/* Set initiator scsi ID. */
	param[0] = MBOX_SET_INIT_SCSI_ID;
	param[1] = qpti->host_param.initiator_scsi_id;
	if (qlogicpti_mbox_command(qpti, param, 1) ||
	   (param[0] != MBOX_COMMAND_COMPLETE)) {
		printk(KERN_EMERG "qlogicpti%d: Cannot set initiator SCSI ID.\n",
		       qpti->qpti_id);
		spin_unlock_irqrestore(host->host_lock, flags);
		return 1;
	}

	/* Initialize state of the queues, both hw and sw. */
	qpti->req_in_ptr = qpti->res_out_ptr = 0;

	param[0] = MBOX_INIT_RES_QUEUE;
	param[1] = RES_QUEUE_LEN + 1;
	param[2] = (u_short) (qpti->res_dvma >> 16);
	param[3] = (u_short) (qpti->res_dvma & 0xffff);
	param[4] = param[5] = 0;
	if (qlogicpti_mbox_command(qpti, param, 1)) {
		printk(KERN_EMERG "qlogicpti%d: Cannot init response queue.\n",
		       qpti->qpti_id);
		spin_unlock_irqrestore(host->host_lock, flags);
		return 1;
	}

	param[0] = MBOX_INIT_REQ_QUEUE;
	param[1] = QLOGICPTI_REQ_QUEUE_LEN + 1;
	param[2] = (u_short) (qpti->req_dvma >> 16);
	param[3] = (u_short) (qpti->req_dvma & 0xffff);
	param[4] = param[5] = 0;
	if (qlogicpti_mbox_command(qpti, param, 1)) {
		printk(KERN_EMERG "qlogicpti%d: Cannot init request queue.\n",
		       qpti->qpti_id);
		spin_unlock_irqrestore(host->host_lock, flags);
		return 1;
	}

	param[0] = MBOX_SET_RETRY_COUNT;
	param[1] = qpti->host_param.retry_count;
	param[2] = qpti->host_param.retry_delay;
	qlogicpti_mbox_command(qpti, param, 0);

	param[0] = MBOX_SET_TAG_AGE_LIMIT;
	param[1] = qpti->host_param.tag_aging;
	qlogicpti_mbox_command(qpti, param, 0);

	for (i = 0; i < MAX_TARGETS; i++) {
		param[0] = MBOX_GET_DEV_QUEUE_PARAMS;
		param[1] = (i << 8);
		qlogicpti_mbox_command(qpti, param, 0);
	}

	param[0] = MBOX_GET_FIRMWARE_STATUS;
	qlogicpti_mbox_command(qpti, param, 0);

	param[0] = MBOX_SET_SELECT_TIMEOUT;
	param[1] = qpti->host_param.selection_timeout;
	qlogicpti_mbox_command(qpti, param, 0);

	for (i = 0; i < MAX_TARGETS; i++) {
		param[0] = MBOX_SET_TARGET_PARAMS;
		param[1] = (i << 8);
		param[2] = (qpti->dev_param[i].device_flags << 8);
		/*
		 * Since we're now loading 1.31 f/w, force narrow/async.
		 */
		param[2] |= 0xc0;
		param[3] = 0;	/* no offset, we do not have sync mode yet */
		qlogicpti_mbox_command(qpti, param, 0);
	}

	/*
	 * Always (sigh) do an initial bus reset (kicks f/w).
	 */
	param[0] = MBOX_BUS_RESET;
	param[1] = qpti->host_param.bus_reset_delay;
	qlogicpti_mbox_command(qpti, param, 0);
	qpti->send_marker = 1;

	spin_unlock_irqrestore(host->host_lock, flags);
	return 0;
}

#define PTI_RESET_LIMIT 400

static int __init qlogicpti_load_firmware(struct qlogicpti *qpti)
{
	struct Scsi_Host *host = qpti->qhost;
	unsigned short csum = 0;
	unsigned short param[6];
	unsigned short *risc_code, risc_code_addr, risc_code_length;
	unsigned long flags;
	int i, timeout;

	risc_code = &sbus_risc_code01[0];
	risc_code_addr = 0x1000;	/* all f/w modules load at 0x1000 */
	risc_code_length = sbus_risc_code_length01;

	spin_lock_irqsave(host->host_lock, flags);

	/* Verify the checksum twice, one before loading it, and once
	 * afterwards via the mailbox commands.
	 */
	for (i = 0; i < risc_code_length; i++)
		csum += risc_code[i];
	if (csum) {
		spin_unlock_irqrestore(host->host_lock, flags);
		printk(KERN_EMERG "qlogicpti%d: Aieee, firmware checksum failed!",
		       qpti->qpti_id);
		return 1;
	}		
	sbus_writew(SBUS_CTRL_RESET, qpti->qregs + SBUS_CTRL);
	sbus_writew((DMA_CTRL_CCLEAR | DMA_CTRL_CIRQ), qpti->qregs + CMD_DMA_CTRL);
	sbus_writew((DMA_CTRL_CCLEAR | DMA_CTRL_CIRQ), qpti->qregs + DATA_DMA_CTRL);
	timeout = PTI_RESET_LIMIT;
	while (--timeout && (sbus_readw(qpti->qregs + SBUS_CTRL) & SBUS_CTRL_RESET))
		udelay(20);
	if (!timeout) {
		spin_unlock_irqrestore(host->host_lock, flags);
		printk(KERN_EMERG "qlogicpti%d: Cannot reset the ISP.", qpti->qpti_id);
		return 1;
	}

	sbus_writew(HCCTRL_RESET, qpti->qregs + HCCTRL);
	mdelay(1);

	sbus_writew((SBUS_CTRL_GENAB | SBUS_CTRL_ERIRQ), qpti->qregs + SBUS_CTRL);
	set_sbus_cfg1(qpti);
	sbus_writew(0, qpti->qregs + SBUS_SEMAPHORE);

	if (sbus_readw(qpti->qregs + RISC_PSR) & RISC_PSR_ULTRA) {
		qpti->ultra = 1;
		sbus_writew((RISC_MTREG_P0ULTRA | RISC_MTREG_P1ULTRA),
			    qpti->qregs + RISC_MTREG);
	} else {
		qpti->ultra = 0;
		sbus_writew((RISC_MTREG_P0DFLT | RISC_MTREG_P1DFLT),
			    qpti->qregs + RISC_MTREG);
	}

	sbus_writew(HCCTRL_REL, qpti->qregs + HCCTRL);

	/* Pin lines are only stable while RISC is paused. */
	sbus_writew(HCCTRL_PAUSE, qpti->qregs + HCCTRL);
	if (sbus_readw(qpti->qregs + CPU_PDIFF) & CPU_PDIFF_MODE)
		qpti->differential = 1;
	else
		qpti->differential = 0;
	sbus_writew(HCCTRL_REL, qpti->qregs + HCCTRL);

	/* This shouldn't be necessary- we've reset things so we should be
	   running from the ROM now.. */

	param[0] = MBOX_STOP_FIRMWARE;
	param[1] = param[2] = param[3] = param[4] = param[5] = 0;
	if (qlogicpti_mbox_command(qpti, param, 1)) {
		printk(KERN_EMERG "qlogicpti%d: Cannot stop firmware for reload.\n",
		       qpti->qpti_id);
		spin_unlock_irqrestore(host->host_lock, flags);
		return 1;
	}		

	/* Load it up.. */
	for (i = 0; i < risc_code_length; i++) {
		param[0] = MBOX_WRITE_RAM_WORD;
		param[1] = risc_code_addr + i;
		param[2] = risc_code[i];
		if (qlogicpti_mbox_command(qpti, param, 1) ||
		    param[0] != MBOX_COMMAND_COMPLETE) {
			printk("qlogicpti%d: Firmware dload failed, I'm bolixed!\n",
			       qpti->qpti_id);
			spin_unlock_irqrestore(host->host_lock, flags);
			return 1;
		}
	}

	/* Reset the ISP again. */
	sbus_writew(HCCTRL_RESET, qpti->qregs + HCCTRL);
	mdelay(1);

	qlogicpti_enable_irqs(qpti);
	sbus_writew(0, qpti->qregs + SBUS_SEMAPHORE);
	sbus_writew(HCCTRL_REL, qpti->qregs + HCCTRL);

	/* Ask ISP to verify the checksum of the new code. */
	param[0] = MBOX_VERIFY_CHECKSUM;
	param[1] = risc_code_addr;
	if (qlogicpti_mbox_command(qpti, param, 1) ||
	    (param[0] != MBOX_COMMAND_COMPLETE)) {
		printk(KERN_EMERG "qlogicpti%d: New firmware csum failure!\n",
		       qpti->qpti_id);
		spin_unlock_irqrestore(host->host_lock, flags);
		return 1;
	}

	/* Start using newly downloaded firmware. */
	param[0] = MBOX_EXEC_FIRMWARE;
	param[1] = risc_code_addr;
	qlogicpti_mbox_command(qpti, param, 1);

	param[0] = MBOX_ABOUT_FIRMWARE;
	if (qlogicpti_mbox_command(qpti, param, 1) ||
	    (param[0] != MBOX_COMMAND_COMPLETE)) {
		printk(KERN_EMERG "qlogicpti%d: AboutFirmware cmd fails.\n",
		       qpti->qpti_id);
		spin_unlock_irqrestore(host->host_lock, flags);
		return 1;
	}

	/* Snag the major and minor revisions from the result. */
	qpti->fware_majrev = param[1];
	qpti->fware_minrev = param[2];
	qpti->fware_micrev = param[3];

	/* Set the clock rate */
	param[0] = MBOX_SET_CLOCK_RATE;
	param[1] = qpti->clock;
	if (qlogicpti_mbox_command(qpti, param, 1) ||
	    (param[0] != MBOX_COMMAND_COMPLETE)) {
		printk(KERN_EMERG "qlogicpti%d: could not set clock rate.\n",
		       qpti->qpti_id);
		spin_unlock_irqrestore(host->host_lock, flags);
		return 1;
	}

	if (qpti->is_pti != 0) {
		/* Load scsi initiator ID and interrupt level into sbus static ram. */
		param[0] = MBOX_WRITE_RAM_WORD;
		param[1] = 0xff80;
		param[2] = (unsigned short) qpti->scsi_id;
		qlogicpti_mbox_command(qpti, param, 1);

		param[0] = MBOX_WRITE_RAM_WORD;
		param[1] = 0xff00;
		param[2] = (unsigned short) 3;
		qlogicpti_mbox_command(qpti, param, 1);
	}

	spin_unlock_irqrestore(host->host_lock, flags);
	return 0;
}

static int qlogicpti_verify_tmon(struct qlogicpti *qpti)
{
	int curstat = sbus_readb(qpti->sreg);

	curstat &= 0xf0;
	if (!(curstat & SREG_FUSE) && (qpti->swsreg & SREG_FUSE))
		printk("qlogicpti%d: Fuse returned to normal state.\n", qpti->qpti_id);
	if (!(curstat & SREG_TPOWER) && (qpti->swsreg & SREG_TPOWER))
		printk("qlogicpti%d: termpwr back to normal state.\n", qpti->qpti_id);
	if (curstat != qpti->swsreg) {
		int error = 0;
		if (curstat & SREG_FUSE) {
			error++;
			printk("qlogicpti%d: Fuse is open!\n", qpti->qpti_id);
		}
		if (curstat & SREG_TPOWER) {
			error++;
			printk("qlogicpti%d: termpwr failure\n", qpti->qpti_id);
		}
		if (qpti->differential &&
		    (curstat & SREG_DSENSE) != SREG_DSENSE) {
			error++;
			printk("qlogicpti%d: You have a single ended device on a "
			       "differential bus!  Please fix!\n", qpti->qpti_id);
		}
		qpti->swsreg = curstat;
		return error;
	}
	return 0;
}

static irqreturn_t qpti_intr(int irq, void *dev_id, struct pt_regs *regs);

static void __init qpti_chain_add(struct qlogicpti *qpti)
{
	spin_lock_irq(&qptichain_lock);
	if (qptichain != NULL) {
		struct qlogicpti *qlink = qptichain;

		while(qlink->next)
			qlink = qlink->next;
		qlink->next = qpti;
	} else {
		qptichain = qpti;
	}
	qpti->next = NULL;
	spin_unlock_irq(&qptichain_lock);
}

static void __init qpti_chain_del(struct qlogicpti *qpti)
{
	spin_lock_irq(&qptichain_lock);
	if (qptichain == qpti) {
		qptichain = qpti->next;
	} else {
		struct qlogicpti *qlink = qptichain;
		while(qlink->next != qpti)
			qlink = qlink->next;
		qlink->next = qpti->next;
	}
	qpti->next = NULL;
	spin_unlock_irq(&qptichain_lock);
}

static int __init qpti_map_regs(struct qlogicpti *qpti)
{
	struct sbus_dev *sdev = qpti->sdev;

	qpti->qregs = sbus_ioremap(&sdev->resource[0], 0,
				   sdev->reg_addrs[0].reg_size,
				   "PTI Qlogic/ISP");
	if (!qpti->qregs) {
		printk("PTI: Qlogic/ISP registers are unmappable\n");
		return -1;
	}
	if (qpti->is_pti) {
		qpti->sreg = sbus_ioremap(&sdev->resource[0], (16 * 4096),
					  sizeof(unsigned char),
					  "PTI Qlogic/ISP statreg");
		if (!qpti->sreg) {
			printk("PTI: Qlogic/ISP status register is unmappable\n");
			return -1;
		}
	}
	return 0;
}

static int __init qpti_register_irq(struct qlogicpti *qpti)
{
	struct sbus_dev *sdev = qpti->sdev;

	qpti->qhost->irq = qpti->irq = sdev->irqs[0];

	/* We used to try various overly-clever things to
	 * reduce the interrupt processing overhead on
	 * sun4c/sun4m when multiple PTI's shared the
	 * same IRQ.  It was too complex and messy to
	 * sanely maintain.
	 */
	if (request_irq(qpti->irq, qpti_intr,
			IRQF_SHARED, "Qlogic/PTI", qpti))
		goto fail;

	printk("qpti%d: IRQ %d ", qpti->qpti_id, qpti->irq);

	return 0;

fail:
	printk("qpti%d: Cannot acquire irq line\n", qpti->qpti_id);
	return -1;
}

static void __init qpti_get_scsi_id(struct qlogicpti *qpti)
{
	qpti->scsi_id = prom_getintdefault(qpti->prom_node,
					   "initiator-id",
					   -1);
	if (qpti->scsi_id == -1)
		qpti->scsi_id = prom_getintdefault(qpti->prom_node,
						   "scsi-initiator-id",
						   -1);
	if (qpti->scsi_id == -1)
		qpti->scsi_id =
			prom_getintdefault(qpti->sdev->bus->prom_node,
					   "scsi-initiator-id", 7);
	qpti->qhost->this_id = qpti->scsi_id;
	qpti->qhost->max_sectors = 64;

	printk("SCSI ID %d ", qpti->scsi_id);
}

static void qpti_get_bursts(struct qlogicpti *qpti)
{
	struct sbus_dev *sdev = qpti->sdev;
	u8 bursts, bmask;

	bursts = prom_getintdefault(qpti->prom_node, "burst-sizes", 0xff);
	bmask = prom_getintdefault(sdev->bus->prom_node,
				   "burst-sizes", 0xff);
	if (bmask != 0xff)
		bursts &= bmask;
	if (bursts == 0xff ||
	    (bursts & DMA_BURST16) == 0 ||
	    (bursts & DMA_BURST32) == 0)
		bursts = (DMA_BURST32 - 1);

	qpti->bursts = bursts;
}

static void qpti_get_clock(struct qlogicpti *qpti)
{
	unsigned int cfreq;

	/* Check for what the clock input to this card is.
	 * Default to 40Mhz.
	 */
	cfreq = prom_getintdefault(qpti->prom_node,"clock-frequency",40000000);
	qpti->clock = (cfreq + 500000)/1000000;
	if (qpti->clock == 0) /* bullshit */
		qpti->clock = 40;
}

/* The request and response queues must each be aligned
 * on a page boundary.
 */
static int __init qpti_map_queues(struct qlogicpti *qpti)
{
	struct sbus_dev *sdev = qpti->sdev;

#define QSIZE(entries)	(((entries) + 1) * QUEUE_ENTRY_LEN)
	qpti->res_cpu = sbus_alloc_consistent(sdev,
					      QSIZE(RES_QUEUE_LEN),
					      &qpti->res_dvma);
	if (qpti->res_cpu == NULL ||
	    qpti->res_dvma == 0) {
		printk("QPTI: Cannot map response queue.\n");
		return -1;
	}

	qpti->req_cpu = sbus_alloc_consistent(sdev,
					      QSIZE(QLOGICPTI_REQ_QUEUE_LEN),
					      &qpti->req_dvma);
	if (qpti->req_cpu == NULL ||
	    qpti->req_dvma == 0) {
		sbus_free_consistent(sdev, QSIZE(RES_QUEUE_LEN),
				     qpti->res_cpu, qpti->res_dvma);
		printk("QPTI: Cannot map request queue.\n");
		return -1;
	}
	memset(qpti->res_cpu, 0, QSIZE(RES_QUEUE_LEN));
	memset(qpti->req_cpu, 0, QSIZE(QLOGICPTI_REQ_QUEUE_LEN));
	return 0;
}

const char *qlogicpti_info(struct Scsi_Host *host)
{
	static char buf[80];
	struct qlogicpti *qpti = (struct qlogicpti *) host->hostdata;

	sprintf(buf, "PTI Qlogic,ISP SBUS SCSI irq %d regs at %p",
		qpti->qhost->irq, qpti->qregs);
	return buf;
}

/* I am a certified frobtronicist. */
static inline void marker_frob(struct Command_Entry *cmd)
{
	struct Marker_Entry *marker = (struct Marker_Entry *) cmd;

	memset(marker, 0, sizeof(struct Marker_Entry));
	marker->hdr.entry_cnt = 1;
	marker->hdr.entry_type = ENTRY_MARKER;
	marker->modifier = SYNC_ALL;
	marker->rsvd = 0;
}

static inline void cmd_frob(struct Command_Entry *cmd, struct scsi_cmnd *Cmnd,
			    struct qlogicpti *qpti)
{
	memset(cmd, 0, sizeof(struct Command_Entry));
	cmd->hdr.entry_cnt = 1;
	cmd->hdr.entry_type = ENTRY_COMMAND;
	cmd->target_id = Cmnd->device->id;
	cmd->target_lun = Cmnd->device->lun;
	cmd->cdb_length = Cmnd->cmd_len;
	cmd->control_flags = 0;
	if (Cmnd->device->tagged_supported) {
		if (qpti->cmd_count[Cmnd->device->id] == 0)
			qpti->tag_ages[Cmnd->device->id] = jiffies;
		if (time_after(jiffies, qpti->tag_ages[Cmnd->device->id] + (5*HZ))) {
			cmd->control_flags = CFLAG_ORDERED_TAG;
			qpti->tag_ages[Cmnd->device->id] = jiffies;
		} else
			cmd->control_flags = CFLAG_SIMPLE_TAG;
	}
	if ((Cmnd->cmnd[0] == WRITE_6) ||
	    (Cmnd->cmnd[0] == WRITE_10) ||
	    (Cmnd->cmnd[0] == WRITE_12))
		cmd->control_flags |= CFLAG_WRITE;
	else
		cmd->control_flags |= CFLAG_READ;
	cmd->time_out = 30;
	memcpy(cmd->cdb, Cmnd->cmnd, Cmnd->cmd_len);
}

/* Do it to it baby. */
static inline int load_cmd(struct scsi_cmnd *Cmnd, struct Command_Entry *cmd,
			   struct qlogicpti *qpti, u_int in_ptr, u_int out_ptr)
{
	struct dataseg *ds;
	struct scatterlist *sg;
	int i, n;

	if (Cmnd->use_sg) {
		int sg_count;

		sg = (struct scatterlist *) Cmnd->request_buffer;
		sg_count = sbus_map_sg(qpti->sdev, sg, Cmnd->use_sg, Cmnd->sc_data_direction);

		ds = cmd->dataseg;
		cmd->segment_cnt = sg_count;

		/* Fill in first four sg entries: */
		n = sg_count;
		if (n > 4)
			n = 4;
		for (i = 0; i < n; i++, sg++) {
			ds[i].d_base = sg_dma_address(sg);
			ds[i].d_count = sg_dma_len(sg);
		}
		sg_count -= 4;
		while (sg_count > 0) {
			struct Continuation_Entry *cont;

			++cmd->hdr.entry_cnt;
			cont = (struct Continuation_Entry *) &qpti->req_cpu[in_ptr];
			in_ptr = NEXT_REQ_PTR(in_ptr);
			if (in_ptr == out_ptr)
				return -1;

			cont->hdr.entry_type = ENTRY_CONTINUATION;
			cont->hdr.entry_cnt = 0;
			cont->hdr.sys_def_1 = 0;
			cont->hdr.flags = 0;
			cont->reserved = 0;
			ds = cont->dataseg;
			n = sg_count;
			if (n > 7)
				n = 7;
			for (i = 0; i < n; i++, sg++) {
				ds[i].d_base = sg_dma_address(sg);
				ds[i].d_count = sg_dma_len(sg);
			}
			sg_count -= n;
		}
	} else if (Cmnd->request_bufflen) {
		Cmnd->SCp.ptr = (char *)(unsigned long)
			sbus_map_single(qpti->sdev,
					Cmnd->request_buffer,
					Cmnd->request_bufflen,
					Cmnd->sc_data_direction);

		cmd->dataseg[0].d_base = (u32) ((unsigned long)Cmnd->SCp.ptr);
		cmd->dataseg[0].d_count = Cmnd->request_bufflen;
		cmd->segment_cnt = 1;
	} else {
		cmd->dataseg[0].d_base = 0;
		cmd->dataseg[0].d_count = 0;
		cmd->segment_cnt = 1; /* Shouldn't this be 0? */
	}

	/* Committed, record Scsi_Cmd so we can find it later. */
	cmd->handle = in_ptr;
	qpti->cmd_slots[in_ptr] = Cmnd;

	qpti->cmd_count[Cmnd->device->id]++;
	sbus_writew(in_ptr, qpti->qregs + MBOX4);
	qpti->req_in_ptr = in_ptr;

	return in_ptr;
}

static inline void update_can_queue(struct Scsi_Host *host, u_int in_ptr, u_int out_ptr)
{
	/* Temporary workaround until bug is found and fixed (one bug has been found
	   already, but fixing it makes things even worse) -jj */
	int num_free = QLOGICPTI_REQ_QUEUE_LEN - REQ_QUEUE_DEPTH(in_ptr, out_ptr) - 64;
	host->can_queue = host->host_busy + num_free;
	host->sg_tablesize = QLOGICPTI_MAX_SG(num_free);
}

static unsigned int scsi_rbuf_get(struct scsi_cmnd *cmd, unsigned char **buf_out)
{
	unsigned char *buf;
	unsigned int buflen;

	if (cmd->use_sg) {
		struct scatterlist *sg;

		sg = (struct scatterlist *) cmd->request_buffer;
		buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
		buflen = sg->length;
	} else {
		buf = cmd->request_buffer;
		buflen = cmd->request_bufflen;
	}

	*buf_out = buf;
	return buflen;
}

static void scsi_rbuf_put(struct scsi_cmnd *cmd, unsigned char *buf)
{
	if (cmd->use_sg) {
		struct scatterlist *sg;

		sg = (struct scatterlist *) cmd->request_buffer;
		kunmap_atomic(buf - sg->offset, KM_IRQ0);
	}
}

/*
 * Until we scan the entire bus with inquiries, go throught this fella...
 */
static void ourdone(struct scsi_cmnd *Cmnd)
{
	struct qlogicpti *qpti = (struct qlogicpti *) Cmnd->device->host->hostdata;
	int tgt = Cmnd->device->id;
	void (*done) (struct scsi_cmnd *);

	/* This grot added by DaveM, blame him for ugliness.
	 * The issue is that in the 2.3.x driver we use the
	 * host_scribble portion of the scsi command as a
	 * completion linked list at interrupt service time,
	 * so we have to store the done function pointer elsewhere.
	 */
	done = (void (*)(struct scsi_cmnd *))
		(((unsigned long) Cmnd->SCp.Message)
#ifdef __sparc_v9__
		 | ((unsigned long) Cmnd->SCp.Status << 32UL)
#endif
		 );

	if ((qpti->sbits & (1 << tgt)) == 0) {
		int ok = host_byte(Cmnd->result) == DID_OK;
		if (Cmnd->cmnd[0] == 0x12 && ok) {
			unsigned char *iqd;
			unsigned int iqd_len;

			iqd_len = scsi_rbuf_get(Cmnd, &iqd);

			/* tags handled in midlayer */
			/* enable sync mode? */
			if (iqd[7] & 0x10) {
				qpti->dev_param[tgt].device_flags |= 0x10;
			} else {
				qpti->dev_param[tgt].synchronous_offset = 0;
				qpti->dev_param[tgt].synchronous_period = 0;
			}
			/* are we wide capable? */
			if (iqd[7] & 0x20) {
				qpti->dev_param[tgt].device_flags |= 0x20;
			}

			scsi_rbuf_put(Cmnd, iqd);

			qpti->sbits |= (1 << tgt);
		} else if (!ok) {
			qpti->sbits |= (1 << tgt);
		}
	}
	done(Cmnd);
}

static int qlogicpti_queuecommand(struct scsi_cmnd *Cmnd, void (*done)(struct scsi_cmnd *));

static int qlogicpti_queuecommand_slow(struct scsi_cmnd *Cmnd,
				       void (*done)(struct scsi_cmnd *))
{
	struct qlogicpti *qpti = (struct qlogicpti *) Cmnd->device->host->hostdata;

	/*
	 * done checking this host adapter?
	 * If not, then rewrite the command
	 * to finish through ourdone so we
	 * can peek at Inquiry data results.
	 */
	if (qpti->sbits && qpti->sbits != 0xffff) {
		/* See above about in ourdone this ugliness... */
		Cmnd->SCp.Message = ((unsigned long)done) & 0xffffffff;
#ifdef CONFIG_SPARC64
		Cmnd->SCp.Status = ((unsigned long)done >> 32UL) & 0xffffffff;
#endif
		return qlogicpti_queuecommand(Cmnd, ourdone);
	}

	/*
	 * We've peeked at all targets for this bus- time
	 * to set parameters for devices for real now.
	 */
	if (qpti->sbits == 0xffff) {
		int i;
		for(i = 0; i < MAX_TARGETS; i++) {
			u_short param[6];
			param[0] = MBOX_SET_TARGET_PARAMS;
			param[1] = (i << 8);
			param[2] = (qpti->dev_param[i].device_flags << 8);
			if (qpti->dev_param[i].device_flags & 0x10) {
				param[3] = (qpti->dev_param[i].synchronous_offset << 8) |
					qpti->dev_param[i].synchronous_period;
			} else {
				param[3] = 0;
			}
			(void) qlogicpti_mbox_command(qpti, param, 0);
		}
		/*
		 * set to zero so any traverse through ourdone
		 * doesn't start the whole process again,
		 */
		qpti->sbits = 0;
	}

	/* check to see if we're done with all adapters... */
	for (qpti = qptichain; qpti != NULL; qpti = qpti->next) {
		if (qpti->sbits) {
			break;
		}
	}

	/*
	 * if we hit the end of the chain w/o finding adapters still
	 * capability-configuring, then we're done with all adapters
	 * and can rock on..
	 */
	if (qpti == NULL)
		Cmnd->device->host->hostt->queuecommand = qlogicpti_queuecommand;

	return qlogicpti_queuecommand(Cmnd, done);
}

/*
 * The middle SCSI layer ensures that queuecommand never gets invoked
 * concurrently with itself or the interrupt handler (though the
 * interrupt handler may call this routine as part of
 * request-completion handling).
 *
 * "This code must fly." -davem
 */
static int qlogicpti_queuecommand(struct scsi_cmnd *Cmnd, void (*done)(struct scsi_cmnd *))
{
	struct Scsi_Host *host = Cmnd->device->host;
	struct qlogicpti *qpti = (struct qlogicpti *) host->hostdata;
	struct Command_Entry *cmd;
	u_int out_ptr;
	int in_ptr;

	Cmnd->scsi_done = done;

	in_ptr = qpti->req_in_ptr;
	cmd = (struct Command_Entry *) &qpti->req_cpu[in_ptr];
	out_ptr = sbus_readw(qpti->qregs + MBOX4);
	in_ptr = NEXT_REQ_PTR(in_ptr);
	if (in_ptr == out_ptr)
		goto toss_command;

	if (qpti->send_marker) {
		marker_frob(cmd);
		qpti->send_marker = 0;
		if (NEXT_REQ_PTR(in_ptr) == out_ptr) {
			sbus_writew(in_ptr, qpti->qregs + MBOX4);
			qpti->req_in_ptr = in_ptr;
			goto toss_command;
		}
		cmd = (struct Command_Entry *) &qpti->req_cpu[in_ptr];
		in_ptr = NEXT_REQ_PTR(in_ptr);
	}
	cmd_frob(cmd, Cmnd, qpti);
	if ((in_ptr = load_cmd(Cmnd, cmd, qpti, in_ptr, out_ptr)) == -1)
		goto toss_command;

	update_can_queue(host, in_ptr, out_ptr);

	return 0;

toss_command:
	printk(KERN_EMERG "qlogicpti%d: request queue overflow\n",
	       qpti->qpti_id);

	/* Unfortunately, unless you use the new EH code, which
	 * we don't, the midlayer will ignore the return value,
	 * which is insane.  We pick up the pieces like this.
	 */
	Cmnd->result = DID_BUS_BUSY;
	done(Cmnd);
	return 1;
}

static int qlogicpti_return_status(struct Status_Entry *sts, int id)
{
	int host_status = DID_ERROR;

	switch (sts->completion_status) {
	      case CS_COMPLETE:
		host_status = DID_OK;
		break;
	      case CS_INCOMPLETE:
		if (!(sts->state_flags & SF_GOT_BUS))
			host_status = DID_NO_CONNECT;
		else if (!(sts->state_flags & SF_GOT_TARGET))
			host_status = DID_BAD_TARGET;
		else if (!(sts->state_flags & SF_SENT_CDB))
			host_status = DID_ERROR;
		else if (!(sts->state_flags & SF_TRANSFERRED_DATA))
			host_status = DID_ERROR;
		else if (!(sts->state_flags & SF_GOT_STATUS))
			host_status = DID_ERROR;
		else if (!(sts->state_flags & SF_GOT_SENSE))
			host_status = DID_ERROR;
		break;
	      case CS_DMA_ERROR:
	      case CS_TRANSPORT_ERROR:
		host_status = DID_ERROR;
		break;
	      case CS_RESET_OCCURRED:
	      case CS_BUS_RESET:
		host_status = DID_RESET;
		break;
	      case CS_ABORTED:
		host_status = DID_ABORT;
		break;
	      case CS_TIMEOUT:
		host_status = DID_TIME_OUT;
		break;
	      case CS_DATA_OVERRUN:
	      case CS_COMMAND_OVERRUN:
	      case CS_STATUS_OVERRUN:
	      case CS_BAD_MESSAGE:
	      case CS_NO_MESSAGE_OUT:
	      case CS_EXT_ID_FAILED:
	      case CS_IDE_MSG_FAILED:
	      case CS_ABORT_MSG_FAILED:
	      case CS_NOP_MSG_FAILED:
	      case CS_PARITY_ERROR_MSG_FAILED:
	      case CS_DEVICE_RESET_MSG_FAILED:
	      case CS_ID_MSG_FAILED:
	      case CS_UNEXP_BUS_FREE:
		host_status = DID_ERROR;
		break;
	      case CS_DATA_UNDERRUN:
		host_status = DID_OK;
		break;
	      default:
		printk(KERN_EMERG "qpti%d: unknown completion status 0x%04x\n",
		       id, sts->completion_status);
		host_status = DID_ERROR;
		break;
	}

	return (sts->scsi_status & STATUS_MASK) | (host_status << 16);
}

static struct scsi_cmnd *qlogicpti_intr_handler(struct qlogicpti *qpti)
{
	struct scsi_cmnd *Cmnd, *done_queue = NULL;
	struct Status_Entry *sts;
	u_int in_ptr, out_ptr;

	if (!(sbus_readw(qpti->qregs + SBUS_STAT) & SBUS_STAT_RINT))
		return NULL;
		
	in_ptr = sbus_readw(qpti->qregs + MBOX5);
	sbus_writew(HCCTRL_CRIRQ, qpti->qregs + HCCTRL);
	if (sbus_readw(qpti->qregs + SBUS_SEMAPHORE) & SBUS_SEMAPHORE_LCK) {
		switch (sbus_readw(qpti->qregs + MBOX0)) {
		case ASYNC_SCSI_BUS_RESET:
		case EXECUTION_TIMEOUT_RESET:
			qpti->send_marker = 1;
			break;
		case INVALID_COMMAND:
		case HOST_INTERFACE_ERROR:
		case COMMAND_ERROR:
		case COMMAND_PARAM_ERROR:
			break;
		};
		sbus_writew(0, qpti->qregs + SBUS_SEMAPHORE);
	}

	/* This looks like a network driver! */
	out_ptr = qpti->res_out_ptr;
	while (out_ptr != in_ptr) {
		u_int cmd_slot;

		sts = (struct Status_Entry *) &qpti->res_cpu[out_ptr];
		out_ptr = NEXT_RES_PTR(out_ptr);

		/* We store an index in the handle, not the pointer in
		 * some form.  This avoids problems due to the fact
		 * that the handle provided is only 32-bits. -DaveM
		 */
		cmd_slot = sts->handle;
		Cmnd = qpti->cmd_slots[cmd_slot];
		qpti->cmd_slots[cmd_slot] = NULL;

		if (sts->completion_status == CS_RESET_OCCURRED ||
		    sts->completion_status == CS_ABORTED ||
		    (sts->status_flags & STF_BUS_RESET))
			qpti->send_marker = 1;

		if (sts->state_flags & SF_GOT_SENSE)
			memcpy(Cmnd->sense_buffer, sts->req_sense_data,
			       sizeof(Cmnd->sense_buffer));

		if (sts->hdr.entry_type == ENTRY_STATUS)
			Cmnd->result =
			    qlogicpti_return_status(sts, qpti->qpti_id);
		else
			Cmnd->result = DID_ERROR << 16;

		if (Cmnd->use_sg) {
			sbus_unmap_sg(qpti->sdev,
				      (struct scatterlist *)Cmnd->request_buffer,
				      Cmnd->use_sg,
				      Cmnd->sc_data_direction);
		} else {
			sbus_unmap_single(qpti->sdev,
					  (__u32)((unsigned long)Cmnd->SCp.ptr),
					  Cmnd->request_bufflen,
					  Cmnd->sc_data_direction);
		}
		qpti->cmd_count[Cmnd->device->id]--;
		sbus_writew(out_ptr, qpti->qregs + MBOX5);
		Cmnd->host_scribble = (unsigned char *) done_queue;
		done_queue = Cmnd;
	}
	qpti->res_out_ptr = out_ptr;

	return done_queue;
}

static irqreturn_t qpti_intr(int irq, void *dev_id, struct pt_regs *regs)
{
	struct qlogicpti *qpti = dev_id;
	unsigned long flags;
	struct scsi_cmnd *dq;

	spin_lock_irqsave(qpti->qhost->host_lock, flags);
	dq = qlogicpti_intr_handler(qpti);

	if (dq != NULL) {
		do {
			struct scsi_cmnd *next;

			next = (struct scsi_cmnd *) dq->host_scribble;
			dq->scsi_done(dq);
			dq = next;
		} while (dq != NULL);
	}
	spin_unlock_irqrestore(qpti->qhost->host_lock, flags);

	return IRQ_HANDLED;
}

static int qlogicpti_abort(struct scsi_cmnd *Cmnd)
{
	u_short param[6];
	struct Scsi_Host *host = Cmnd->device->host;
	struct qlogicpti *qpti = (struct qlogicpti *) host->hostdata;
	int return_status = SUCCESS;
	u32 cmd_cookie;
	int i;

	printk(KERN_WARNING "qlogicpti : Aborting cmd for tgt[%d] lun[%d]\n",
	       (int)Cmnd->device->id, (int)Cmnd->device->lun);

	qlogicpti_disable_irqs(qpti);

	/* Find the 32-bit cookie we gave to the firmware for
	 * this command.
	 */
	for (i = 0; i < QLOGICPTI_REQ_QUEUE_LEN + 1; i++)
		if (qpti->cmd_slots[i] == Cmnd)
			break;
	cmd_cookie = i;

	param[0] = MBOX_ABORT;
	param[1] = (((u_short) Cmnd->device->id) << 8) | Cmnd->device->lun;
	param[2] = cmd_cookie >> 16;
	param[3] = cmd_cookie & 0xffff;
	if (qlogicpti_mbox_command(qpti, param, 0) ||
	    (param[0] != MBOX_COMMAND_COMPLETE)) {
		printk(KERN_EMERG "qlogicpti : scsi abort failure: %x\n", param[0]);
		return_status = FAILED;
	}

	qlogicpti_enable_irqs(qpti);

	return return_status;
}

static int qlogicpti_reset(struct scsi_cmnd *Cmnd)
{
	u_short param[6];
	struct Scsi_Host *host = Cmnd->device->host;
	struct qlogicpti *qpti = (struct qlogicpti *) host->hostdata;
	int return_status = SUCCESS;

	printk(KERN_WARNING "qlogicpti : Resetting SCSI bus!\n");

	qlogicpti_disable_irqs(qpti);

	param[0] = MBOX_BUS_RESET;
	param[1] = qpti->host_param.bus_reset_delay;
	if (qlogicpti_mbox_command(qpti, param, 0) ||
	   (param[0] != MBOX_COMMAND_COMPLETE)) {
		printk(KERN_EMERG "qlogicisp : scsi bus reset failure: %x\n", param[0]);
		return_status = FAILED;
	}

	qlogicpti_enable_irqs(qpti);

	return return_status;
}

static struct scsi_host_template qpti_template = {
	.module			= THIS_MODULE,
	.name			= "qlogicpti",
	.info			= qlogicpti_info,
	.queuecommand		= qlogicpti_queuecommand_slow,
	.eh_abort_handler	= qlogicpti_abort,
	.eh_bus_reset_handler	= qlogicpti_reset,
	.can_queue		= QLOGICPTI_REQ_QUEUE_LEN,
	.this_id		= 7,
	.sg_tablesize		= QLOGICPTI_MAX_SG(QLOGICPTI_REQ_QUEUE_LEN),
	.cmd_per_lun		= 1,
	.use_clustering		= ENABLE_CLUSTERING,
};

static int __devinit qpti_sbus_probe(struct of_device *dev, const struct of_device_id *match)
{
	static int nqptis;
	struct sbus_dev *sdev = to_sbus_device(&dev->dev);
	struct device_node *dp = dev->node;
	struct scsi_host_template *tpnt = match->data;
	struct Scsi_Host *host;
	struct qlogicpti *qpti;
	char *fcode;

	/* Sometimes Antares cards come up not completely
	 * setup, and we get a report of a zero IRQ.
	 */
	if (sdev->irqs[0] == 0)
		return -ENODEV;

	host = scsi_host_alloc(tpnt, sizeof(struct qlogicpti));
	if (!host)
		return -ENOMEM;

	qpti = (struct qlogicpti *) host->hostdata;

	host->max_id = MAX_TARGETS;
	qpti->qhost = host;
	qpti->sdev = sdev;
	qpti->qpti_id = nqptis;
	qpti->prom_node = sdev->prom_node;
	strcpy(qpti->prom_name, sdev->ofdev.node->name);
	qpti->is_pti = strcmp(qpti->prom_name, "QLGC,isp");

	if (qpti_map_regs(qpti) < 0)
		goto fail_unlink;

	if (qpti_register_irq(qpti) < 0)
		goto fail_unmap_regs;

	qpti_get_scsi_id(qpti);
	qpti_get_bursts(qpti);
	qpti_get_clock(qpti);

	/* Clear out scsi_cmnd array. */
	memset(qpti->cmd_slots, 0, sizeof(qpti->cmd_slots));

	if (qpti_map_queues(qpti) < 0)
		goto fail_free_irq;

	/* Load the firmware. */
	if (qlogicpti_load_firmware(qpti))
		goto fail_unmap_queues;
	if (qpti->is_pti) {
		/* Check the PTI status reg. */
		if (qlogicpti_verify_tmon(qpti))
			goto fail_unmap_queues;
	}

	/* Reset the ISP and init res/req queues. */
	if (qlogicpti_reset_hardware(host))
		goto fail_unmap_queues;

	if (scsi_add_host(host, &dev->dev))
		goto fail_unmap_queues;

	printk("(Firmware v%d.%d.%d)", qpti->fware_majrev,
	       qpti->fware_minrev, qpti->fware_micrev);

	fcode = of_get_property(dp, "isp-fcode", NULL);
	if (fcode && fcode[0])
		printk("(Firmware %s)", fcode);
	if (of_find_property(dp, "differential", NULL) != NULL)
		qpti->differential = 1;
			
	printk (" [%s Wide, using %s interface]\n",
		(qpti->ultra ? "Ultra" : "Fast"),
		(qpti->differential ? "differential" : "single ended"));

	dev_set_drvdata(&sdev->ofdev.dev, qpti);

	qpti_chain_add(qpti);

	scsi_scan_host(host);
	nqptis++;

	return 0;

fail_unmap_queues:
#define QSIZE(entries)	(((entries) + 1) * QUEUE_ENTRY_LEN)
	sbus_free_consistent(qpti->sdev,
			     QSIZE(RES_QUEUE_LEN),
			     qpti->res_cpu, qpti->res_dvma);
	sbus_free_consistent(qpti->sdev,
			     QSIZE(QLOGICPTI_REQ_QUEUE_LEN),
			     qpti->req_cpu, qpti->req_dvma);
#undef QSIZE

fail_unmap_regs:
	sbus_iounmap(qpti->qregs,
		     qpti->sdev->reg_addrs[0].reg_size);
	if (qpti->is_pti)
		sbus_iounmap(qpti->sreg, sizeof(unsigned char));

fail_free_irq:
	free_irq(qpti->irq, qpti);

fail_unlink:
	scsi_host_put(host);

	return -ENODEV;
}

static int __devexit qpti_sbus_remove(struct of_device *dev)
{
	struct qlogicpti *qpti = dev_get_drvdata(&dev->dev);

	qpti_chain_del(qpti);

	scsi_remove_host(qpti->qhost);

	/* Shut up the card. */
	sbus_writew(0, qpti->qregs + SBUS_CTRL);

	/* Free IRQ handler and unmap Qlogic,ISP and PTI status regs. */
	free_irq(qpti->irq, qpti);

#define QSIZE(entries)	(((entries) + 1) * QUEUE_ENTRY_LEN)
	sbus_free_consistent(qpti->sdev,
			     QSIZE(RES_QUEUE_LEN),
			     qpti->res_cpu, qpti->res_dvma);
	sbus_free_consistent(qpti->sdev,
			     QSIZE(QLOGICPTI_REQ_QUEUE_LEN),
			     qpti->req_cpu, qpti->req_dvma);
#undef QSIZE

	sbus_iounmap(qpti->qregs, qpti->sdev->reg_addrs[0].reg_size);
	if (qpti->is_pti)
		sbus_iounmap(qpti->sreg, sizeof(unsigned char));

	scsi_host_put(qpti->qhost);

	return 0;
}

static struct of_device_id qpti_match[] = {
	{
		.name = "ptisp",
		.data = &qpti_template,
	},
	{
		.name = "PTI,ptisp",
		.data = &qpti_template,
	},
	{
		.name = "QLGC,isp",
		.data = &qpti_template,
	},
	{
		.name = "SUNW,isp",
		.data = &qpti_template,
	},
	{},
};
MODULE_DEVICE_TABLE(of, qpti_match);

static struct of_platform_driver qpti_sbus_driver = {
	.name		= "qpti",
	.match_table	= qpti_match,
	.probe		= qpti_sbus_probe,
	.remove		= __devexit_p(qpti_sbus_remove),
};

static int __init qpti_init(void)
{
	return of_register_driver(&qpti_sbus_driver, &sbus_bus_type);
}

static void __exit qpti_exit(void)
{
	of_unregister_driver(&qpti_sbus_driver);
}

MODULE_DESCRIPTION("QlogicISP SBUS driver");
MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
MODULE_LICENSE("GPL");
MODULE_VERSION("2.0");

module_init(qpti_init);
module_exit(qpti_exit);