1 /* $NetBSD: aic7xxx_inline.h,v 1.12 2006/11/16 01:32:51 christos Exp $ */
2
3 /*
4 * Inline routines shareable across OS platforms.
5 *
6 * Copyright (c) 1994-2001 Justin T. Gibbs.
7 * Copyright (c) 2000-2001 Adaptec Inc.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions, and the following disclaimer,
15 * without modification.
16 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
17 * substantially similar to the "NO WARRANTY" disclaimer below
18 * ("Disclaimer") and any redistribution must be conditioned upon
19 * including a substantially similar Disclaimer requirement for further
20 * binary redistribution.
21 * 3. Neither the names of the above-listed copyright holders nor the names
22 * of any contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * Alternatively, this software may be distributed under the terms of the
26 * GNU General Public License ("GPL") version 2 as published by the Free
27 * Software Foundation.
28 *
29 * NO WARRANTY
30 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
31 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
32 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
33 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
34 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
38 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
39 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
40 * POSSIBILITY OF SUCH DAMAGES.
41 *
42 * //depot/aic7xxx/aic7xxx/aic7xxx_inline.h#39 $
43 *
44 * $FreeBSD: /repoman/r/ncvs/src/sys/dev/aic7xxx/aic7xxx_inline.h,v 1.20 2003/01/20 20:44:55 gibbs Exp $
45 */
46 /*
47 * Ported from FreeBSD by Pascal Renauld, Network Storage Solutions, Inc. - April 2003
48 */
49
50 #ifndef _AIC7XXX_INLINE_H_
51 #define _AIC7XXX_INLINE_H_
52
53 /************************* Sequencer Execution Control ************************/
54 static __inline void ahc_pause_bug_fix(struct ahc_softc *ahc);
55 static __inline int ahc_is_paused(struct ahc_softc *ahc);
56 static __inline void ahc_pause(struct ahc_softc *ahc);
57 static __inline void ahc_unpause(struct ahc_softc *ahc);
58
59 /*
60 * Work around any chip bugs related to halting sequencer execution.
61 * On Ultra2 controllers, we must clear the CIOBUS stretch signal by
62 * reading a register that will set this signal and deassert it.
63 * Without this workaround, if the chip is paused, by an interrupt or
64 * manual pause while accessing scb ram, accesses to certain registers
65 * will hang the system (infinite pci retries).
66 */
67 static __inline void
68 ahc_pause_bug_fix(struct ahc_softc *ahc)
69 {
70 if ((ahc->features & AHC_ULTRA2) != 0)
71 (void)ahc_inb(ahc, CCSCBCTL);
72 }
73
74 /*
75 * Determine whether the sequencer has halted code execution.
76 * Returns non-zero status if the sequencer is stopped.
77 */
78 static __inline int
79 ahc_is_paused(struct ahc_softc *ahc)
80 {
81 return ((ahc_inb(ahc, HCNTRL) & PAUSE) != 0);
82 }
83
84 /*
85 * Request that the sequencer stop and wait, indefinitely, for it
86 * to stop. The sequencer will only acknowledge that it is paused
87 * once it has reached an instruction boundary and PAUSEDIS is
88 * cleared in the SEQCTL register. The sequencer may use PAUSEDIS
89 * for critical sections.
90 */
91 static __inline void
92 ahc_pause(struct ahc_softc *ahc)
93 {
94 ahc_outb(ahc, HCNTRL, ahc->pause);
95
96 /*
97 * Since the sequencer can disable pausing in a critical section, we
98 * must loop until it actually stops.
99 */
100 while (ahc_is_paused(ahc) == 0)
101 ;
102
103 ahc_pause_bug_fix(ahc);
104 }
105
106 /*
107 * Allow the sequencer to continue program execution.
108 * We check here to ensure that no additional interrupt
109 * sources that would cause the sequencer to halt have been
110 * asserted. If, for example, a SCSI bus reset is detected
111 * while we are fielding a different, pausing, interrupt type,
112 * we don't want to release the sequencer before going back
113 * into our interrupt handler and dealing with this new
114 * condition.
115 */
116 static __inline void
117 ahc_unpause(struct ahc_softc *ahc)
118 {
119 if ((ahc_inb(ahc, INTSTAT) & (SCSIINT | SEQINT | BRKADRINT)) == 0)
120 ahc_outb(ahc, HCNTRL, ahc->unpause);
121 }
122
123 /*********************** Untagged Transaction Routines ************************/
124 static __inline void ahc_freeze_untagged_queues(struct ahc_softc *ahc);
125 static __inline void ahc_release_untagged_queues(struct ahc_softc *ahc);
126
127 /*
128 * Block our completion routine from starting the next untagged
129 * transaction for this target or target lun.
130 */
131 static __inline void
132 ahc_freeze_untagged_queues(struct ahc_softc *ahc)
133 {
134 if ((ahc->flags & AHC_SCB_BTT) == 0)
135 ahc->untagged_queue_lock++;
136 }
137
138 /*
139 * Allow the next untagged transaction for this target or target lun
140 * to be executed. We use a counting semaphore to allow the lock
141 * to be acquired recursively. Once the count drops to zero, the
142 * transaction queues will be run.
143 */
144 static __inline void
145 ahc_release_untagged_queues(struct ahc_softc *ahc)
146 {
147 if ((ahc->flags & AHC_SCB_BTT) == 0) {
148 ahc->untagged_queue_lock--;
149 if (ahc->untagged_queue_lock == 0)
150 ahc_run_untagged_queues(ahc);
151 }
152 }
153
154 /************************** Memory mapping routines ***************************/
155 static __inline struct ahc_dma_seg *
156 ahc_sg_bus_to_virt(struct scb *scb,
157 uint32_t sg_busaddr);
158 static __inline uint32_t
159 ahc_sg_virt_to_bus(struct scb *scb,
160 struct ahc_dma_seg *sg);
161 static __inline uint32_t
162 ahc_hscb_busaddr(struct ahc_softc *ahc, u_int index);
163 static __inline void ahc_sync_scb(struct ahc_softc *ahc,
164 struct scb *scb, int op);
165 static __inline void ahc_sync_sglist(struct ahc_softc *ahc,
166 struct scb *scb, int op);
167 static __inline uint32_t
168 ahc_targetcmd_offset(struct ahc_softc *ahc,
169 u_int index);
170
171 static __inline struct ahc_dma_seg *
172 ahc_sg_bus_to_virt(struct scb *scb, uint32_t sg_busaddr)
173 {
174 int sg_index;
175
176 sg_index = (sg_busaddr - scb->sg_list_phys)/sizeof(struct ahc_dma_seg);
177 /* sg_list_phys points to entry 1, not 0 */
178 sg_index++;
179
180 return (&scb->sg_list[sg_index]);
181 }
182
183 static __inline uint32_t
184 ahc_sg_virt_to_bus(struct scb *scb, struct ahc_dma_seg *sg)
185 {
186 int sg_index;
187
188 /* sg_list_phys points to entry 1, not 0 */
189 sg_index = sg - &scb->sg_list[1];
190
191 return (scb->sg_list_phys + (sg_index * sizeof(*scb->sg_list)));
192 }
193
194 static __inline uint32_t
195 ahc_hscb_busaddr(struct ahc_softc *ahc, u_int index)
196 {
197 return (ahc->scb_data->hscb_busaddr
198 + (sizeof(struct hardware_scb) * index));
199 }
200
201 static __inline void
202 ahc_sync_scb(struct ahc_softc *ahc, struct scb *scb, int op)
203 {
204 ahc_dmamap_sync(ahc, ahc->parent_dmat,
205 ahc->scb_data->hscb_dmamap,
206 /*offset*/(scb->hscb - ahc->scb_data->hscbs) * sizeof(*scb->hscb),
207 /*len*/sizeof(*scb->hscb), op);
208 }
209
210 static __inline void
211 ahc_sync_sglist(struct ahc_softc *ahc, struct scb *scb, int op)
212 {
213 if (scb->sg_count == 0)
214 return;
215
216 ahc_dmamap_sync(ahc, ahc->parent_dmat, scb->sg_map->sg_dmamap,
217 /*offset*/(scb->sg_list - scb->sg_map->sg_vaddr)
218 * sizeof(struct ahc_dma_seg),
219 /*len*/sizeof(struct ahc_dma_seg) * scb->sg_count, op);
220 }
221
222 static __inline uint32_t
223 ahc_targetcmd_offset(struct ahc_softc *ahc, u_int index)
224 {
225 return (((uint8_t *)&ahc->targetcmds[index]) - ahc->qoutfifo);
226 }
227
228 /******************************** Debugging ***********************************/
229 static __inline char *ahc_name(struct ahc_softc *ahc);
230
231 static __inline char *
232 ahc_name(struct ahc_softc *ahc)
233 {
234 return (ahc->name);
235 }
236
237 /*********************** Miscellaneous Support Functions ***********************/
238
239 static __inline void ahc_update_residual(struct ahc_softc *ahc,
240 struct scb *scb);
241 static __inline struct ahc_initiator_tinfo *
242 ahc_fetch_transinfo(struct ahc_softc *ahc,
243 char channel, u_int our_id,
244 u_int remote_id,
245 struct ahc_tmode_tstate **tstate);
246 static __inline uint16_t
247 ahc_inw(struct ahc_softc *ahc, u_int port);
248 static __inline void ahc_outw(struct ahc_softc *ahc, u_int port,
249 u_int value);
250 static __inline uint32_t
251 ahc_inl(struct ahc_softc *ahc, u_int port);
252 static __inline void ahc_outl(struct ahc_softc *ahc, u_int port,
253 uint32_t value);
254 static __inline uint64_t
255 ahc_inq(struct ahc_softc *ahc, u_int port);
256 static __inline void ahc_outq(struct ahc_softc *ahc, u_int port,
257 uint64_t value);
258 static __inline struct scb*
259 ahc_get_scb(struct ahc_softc *ahc);
260 static __inline void ahc_free_scb(struct ahc_softc *ahc, struct scb *scb);
261 static __inline void ahc_swap_with_next_hscb(struct ahc_softc *ahc,
262 struct scb *scb);
263 static __inline void ahc_queue_scb(struct ahc_softc *ahc, struct scb *scb);
264 static __inline struct scsi_sense_data *
265 ahc_get_sense_buf(struct ahc_softc *ahc,
266 struct scb *scb);
267 static __inline uint32_t
268 ahc_get_sense_bufaddr(struct ahc_softc *ahc,
269 struct scb *scb);
270
271 /*
272 * Determine whether the sequencer reported a residual
273 * for this SCB/transaction.
274 */
275 static __inline void
276 ahc_update_residual(struct ahc_softc *ahc, struct scb *scb)
277 {
278 uint32_t sgptr;
279
280 sgptr = ahc_le32toh(scb->hscb->sgptr);
281 if ((sgptr & SG_RESID_VALID) != 0)
282 ahc_calc_residual(ahc, scb);
283 }
284
285 /*
286 * Return pointers to the transfer negotiation information
287 * for the specified our_id/remote_id pair.
288 */
289 static __inline struct ahc_initiator_tinfo *
290 ahc_fetch_transinfo(struct ahc_softc *ahc, char channel, u_int our_id,
291 u_int remote_id, struct ahc_tmode_tstate **tstate)
292 {
293 /*
294 * Transfer data structures are stored from the perspective
295 * of the target role. Since the parameters for a connection
296 * in the initiator role to a given target are the same as
297 * when the roles are reversed, we pretend we are the target.
298 */
299 #ifdef notdef
300 if (channel == 'B')
301 our_id += 8;
302 #endif
303 *tstate = ahc->enabled_targets[our_id];
304 return (&(*tstate)->transinfo[remote_id]);
305 }
306
307 static __inline uint16_t
308 ahc_inw(struct ahc_softc *ahc, u_int port)
309 {
310 return ((ahc_inb(ahc, port+1) << 8) | ahc_inb(ahc, port));
311 }
312
313 static __inline void
314 ahc_outw(struct ahc_softc *ahc, u_int port, u_int value)
315 {
316 ahc_outb(ahc, port, value & 0xFF);
317 ahc_outb(ahc, port+1, (value >> 8) & 0xFF);
318 }
319
320 static __inline uint32_t
321 ahc_inl(struct ahc_softc *ahc, u_int port)
322 {
323 return ((ahc_inb(ahc, port))
324 | (ahc_inb(ahc, port+1) << 8)
325 | (ahc_inb(ahc, port+2) << 16)
326 | (ahc_inb(ahc, port+3) << 24));
327 }
328
329 static __inline void
330 ahc_outl(struct ahc_softc *ahc, u_int port, uint32_t value)
331 {
332 ahc_outb(ahc, port, (value) & 0xFF);
333 ahc_outb(ahc, port+1, ((value) >> 8) & 0xFF);
334 ahc_outb(ahc, port+2, ((value) >> 16) & 0xFF);
335 ahc_outb(ahc, port+3, ((value) >> 24) & 0xFF);
336 }
337
338 static __inline uint64_t
339 ahc_inq(struct ahc_softc *ahc, u_int port)
340 {
341 return ((ahc_inb(ahc, port))
342 | (ahc_inb(ahc, port+1) << 8)
343 | (ahc_inb(ahc, port+2) << 16)
344 | (ahc_inb(ahc, port+3) << 24)
345 | (((uint64_t)ahc_inb(ahc, port+4)) << 32)
346 | (((uint64_t)ahc_inb(ahc, port+5)) << 40)
347 | (((uint64_t)ahc_inb(ahc, port+6)) << 48)
348 | (((uint64_t)ahc_inb(ahc, port+7)) << 56));
349 }
350
351 static __inline void
352 ahc_outq(struct ahc_softc *ahc, u_int port, uint64_t value)
353 {
354 ahc_outb(ahc, port, value & 0xFF);
355 ahc_outb(ahc, port+1, (value >> 8) & 0xFF);
356 ahc_outb(ahc, port+2, (value >> 16) & 0xFF);
357 ahc_outb(ahc, port+3, (value >> 24) & 0xFF);
358 ahc_outb(ahc, port+4, (value >> 32) & 0xFF);
359 ahc_outb(ahc, port+5, (value >> 40) & 0xFF);
360 ahc_outb(ahc, port+6, (value >> 48) & 0xFF);
361 ahc_outb(ahc, port+7, (value >> 56) & 0xFF);
362 }
363
364 /*
365 * Get a free scb. If there are none, see if we can allocate a new SCB.
366 */
367 static __inline struct scb *
368 ahc_get_scb(struct ahc_softc *ahc)
369 {
370 struct scb *scb;
371
372 if ((scb = SLIST_FIRST(&ahc->scb_data->free_scbs)) == NULL)
373 return (NULL);
374 SLIST_REMOVE_HEAD(&ahc->scb_data->free_scbs, links.sle);
375 return (scb);
376 }
377
378 /*
379 * Return an SCB resource to the free list.
380 */
381 static __inline void
382 ahc_free_scb(struct ahc_softc *ahc, struct scb *scb)
383 {
384 struct hardware_scb *hscb;
385
386 hscb = scb->hscb;
387 /* Clean up for the next user */
388 ahc->scb_data->scbindex[hscb->tag] = NULL;
389 scb->flags = SCB_FREE;
390 hscb->control = 0;
391
392 SLIST_INSERT_HEAD(&ahc->scb_data->free_scbs, scb, links.sle);
393
394 /* Notify the OSM that a resource is now available. */
395 ahc_platform_scb_free(ahc, scb);
396 }
397
398 static __inline struct scb *
399 ahc_lookup_scb(struct ahc_softc *ahc, u_int tag)
400 {
401 struct scb* scb;
402
403 scb = ahc->scb_data->scbindex[tag];
404 if (scb != NULL)
405 ahc_sync_scb(ahc, scb,
406 BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
407 return (scb);
408 }
409
410 static __inline void
411 ahc_swap_with_next_hscb(struct ahc_softc *ahc, struct scb *scb)
412 {
413 struct hardware_scb *q_hscb;
414 u_int saved_tag;
415
416 /*
417 * Our queuing method is a bit tricky. The card
418 * knows in advance which HSCB to download, and we
419 * can't disappoint it. To achieve this, the next
420 * SCB to download is saved off in ahc->next_queued_scb.
421 * When we are called to queue "an arbitrary scb",
422 * we copy the contents of the incoming HSCB to the one
423 * the sequencer knows about, swap HSCB pointers and
424 * finally assign the SCB to the tag indexed location
425 * in the scb_array. This makes sure that we can still
426 * locate the correct SCB by SCB_TAG.
427 */
428 q_hscb = ahc->next_queued_scb->hscb;
429 saved_tag = q_hscb->tag;
430 memcpy(q_hscb, scb->hscb, sizeof(*scb->hscb));
431 if ((scb->flags & SCB_CDB32_PTR) != 0) {
432 q_hscb->shared_data.cdb_ptr =
433 ahc_htole32(ahc_hscb_busaddr(ahc, q_hscb->tag)
434 + offsetof(struct hardware_scb, cdb32));
435 }
436 q_hscb->tag = saved_tag;
437 q_hscb->next = scb->hscb->tag;
438
439 /* Now swap HSCB pointers. */
440 ahc->next_queued_scb->hscb = scb->hscb;
441 scb->hscb = q_hscb;
442
443 /* Now define the mapping from tag to SCB in the scbindex */
444 ahc->scb_data->scbindex[scb->hscb->tag] = scb;
445 }
446
447 /*
448 * Tell the sequencer about a new transaction to execute.
449 */
450 static __inline void
451 ahc_queue_scb(struct ahc_softc *ahc, struct scb *scb)
452 {
453 ahc_swap_with_next_hscb(ahc, scb);
454
455 if (scb->hscb->tag == SCB_LIST_NULL
456 || scb->hscb->next == SCB_LIST_NULL)
457 panic("Attempt to queue invalid SCB tag %x:%x\n",
458 scb->hscb->tag, scb->hscb->next);
459 /*
460 * Keep a history of SCBs we've downloaded in the qinfifo.
461 */
462 ahc->qinfifo[ahc->qinfifonext++] = scb->hscb->tag;
463
464 /*
465 * Make sure our data is consistent from the
466 * perspective of the adapter.
467 */
468 ahc_sync_scb(ahc, scb, BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
469
470 /* Tell the adapter about the newly queued SCB */
471 if ((ahc->features & AHC_QUEUE_REGS) != 0) {
472 ahc_outb(ahc, HNSCB_QOFF, ahc->qinfifonext);
473 } else {
474 if ((ahc->features & AHC_AUTOPAUSE) == 0)
475 ahc_pause(ahc);
476 ahc_outb(ahc, KERNEL_QINPOS, ahc->qinfifonext);
477 if ((ahc->features & AHC_AUTOPAUSE) == 0)
478 ahc_unpause(ahc);
479 }
480 }
481
482 static __inline struct scsi_sense_data *
483 ahc_get_sense_buf(struct ahc_softc *ahc, struct scb *scb)
484 {
485 int offset;
486
487 offset = scb - ahc->scb_data->scbarray;
488 return (&ahc->scb_data->sense[offset]);
489 }
490
491 static __inline uint32_t
492 ahc_get_sense_bufaddr(struct ahc_softc *ahc, struct scb *scb)
493 {
494 int offset;
495
496 offset = scb - ahc->scb_data->scbarray;
497 return (ahc->scb_data->sense_busaddr
498 + (offset * sizeof(struct scsi_sense_data)));
499 }
500
501 /************************** Interrupt Processing ******************************/
502 static __inline void ahc_sync_qoutfifo(struct ahc_softc *ahc, int op);
503 static __inline void ahc_sync_tqinfifo(struct ahc_softc *ahc, int op);
504 static __inline u_int ahc_check_cmdcmpltqueues(struct ahc_softc *ahc);
505 static __inline int ahc_intr(void *arg);
506 static __inline void ahc_minphys(struct buf *bp);
507
508 static __inline void
509 ahc_minphys(bp)
510 struct buf *bp;
511 {
512 /*
513 * Even though the card can transfer up to 16megs per command
514 * we are limited by the number of segments in the DMA segment
515 * list that we can hold. The worst case is that all pages are
516 * discontinuous physically, hence the "page per segment" limit
517 * enforced here.
518 */
519 if (bp->b_bcount > AHC_MAXTRANSFER_SIZE) {
520 bp->b_bcount = AHC_MAXTRANSFER_SIZE;
521 }
522 minphys(bp);
523 }
524
525 static __inline void
526 ahc_sync_qoutfifo(struct ahc_softc *ahc, int op)
527 {
528 ahc_dmamap_sync(ahc, ahc->parent_dmat, ahc->shared_data_dmamap,
529 /*offset*/0, /*len*/256, op);
530 }
531
532 static __inline void
533 ahc_sync_tqinfifo(struct ahc_softc *ahc, int op)
534 {
535 #ifdef AHC_TARGET_MODE
536 if ((ahc->flags & AHC_TARGETROLE) != 0) {
537 ahc_dmamap_sync(ahc, ahc->parent_dmat /*shared_data_dmat*/,
538 ahc->shared_data_dmamap,
539 ahc_targetcmd_offset(ahc, 0),
540 sizeof(struct target_cmd) * AHC_TMODE_CMDS,
541 op);
542 }
543 #endif
544 }
545
546 /*
547 * See if the firmware has posted any completed commands
548 * into our in-core command complete fifos.
549 */
550 #define AHC_RUN_QOUTFIFO 0x1
551 #define AHC_RUN_TQINFIFO 0x2
552 static __inline u_int
553 ahc_check_cmdcmpltqueues(struct ahc_softc *ahc)
554 {
555 u_int retval;
556
557 retval = 0;
558 ahc_dmamap_sync(ahc, ahc->parent_dmat /*shared_data_dmat*/, ahc->shared_data_dmamap,
559 /*offset*/ahc->qoutfifonext, /*len*/1,
560 BUS_DMASYNC_POSTREAD);
561 if (ahc->qoutfifo[ahc->qoutfifonext] != SCB_LIST_NULL)
562 retval |= AHC_RUN_QOUTFIFO;
563 #ifdef AHC_TARGET_MODE
564 if ((ahc->flags & AHC_TARGETROLE) != 0
565 && (ahc->flags & AHC_TQINFIFO_BLOCKED) == 0) {
566 ahc_dmamap_sync(ahc, ahc->parent_dmat /*shared_data_dmat*/,
567 ahc->shared_data_dmamap,
568 ahc_targetcmd_offset(ahc, ahc->tqinfifonext),
569 /*len*/sizeof(struct target_cmd),
570 BUS_DMASYNC_POSTREAD);
571 if (ahc->targetcmds[ahc->tqinfifonext].cmd_valid != 0)
572 retval |= AHC_RUN_TQINFIFO;
573 }
574 #endif
575 return (retval);
576 }
577
578 /*
579 * Catch an interrupt from the adapter
580 */
581 static __inline int
582 ahc_intr(void *arg)
583 {
584 struct ahc_softc *ahc = (struct ahc_softc*)arg;
585 u_int intstat;
586
587 if ((ahc->pause & INTEN) == 0) {
588 /*
589 * Our interrupt is not enabled on the chip
590 * and may be disabled for re-entrancy reasons,
591 * so just return. This is likely just a shared
592 * interrupt.
593 */
594 return 1;
595 }
596 /*
597 * Instead of directly reading the interrupt status register,
598 * infer the cause of the interrupt by checking our in-core
599 * completion queues. This avoids a costly PCI bus read in
600 * most cases.
601 */
602 if ((ahc->flags & (AHC_ALL_INTERRUPTS|AHC_EDGE_INTERRUPT)) == 0
603 && (ahc_check_cmdcmpltqueues(ahc) != 0))
604 intstat = CMDCMPLT;
605 else {
606 intstat = ahc_inb(ahc, INTSTAT);
607 }
608
609 if (intstat & CMDCMPLT) {
610 ahc_outb(ahc, CLRINT, CLRCMDINT);
611 /*
612 * Ensure that the chip sees that we've cleared
613 * this interrupt before we walk the output fifo.
614 * Otherwise, we may, due to posted bus writes,
615 * clear the interrupt after we finish the scan,
616 * and after the sequencer has added new entries
617 * and asserted the interrupt again.
618 */
619 ahc_flush_device_writes(ahc);
620 scsipi_channel_freeze(ahc->channel == 'A' ? &ahc->sc_channel : &ahc->sc_channel_b, 1);
621 ahc_run_qoutfifo(ahc);
622 scsipi_channel_thaw(ahc->channel == 'A' ? &ahc->sc_channel : &ahc->sc_channel_b, 1);
623 #ifdef AHC_TARGET_MODE
624 if ((ahc->flags & AHC_TARGETROLE) != 0)
625 ahc_run_tqinfifo(ahc, /*paused*/FALSE);
626 #endif
627 }
628
629 if (intstat == 0xFF && (ahc->features & AHC_REMOVABLE) != 0)
630 /* Hot eject */
631 return 1;
632
633 if ((intstat & INT_PEND) == 0) {
634 #if AHC_PCI_CONFIG > 0
635 if (ahc->unsolicited_ints > 500) {
636 ahc->unsolicited_ints = 0;
637 if ((ahc->chip & AHC_PCI) != 0
638 && (ahc_inb(ahc, ERROR) & PCIERRSTAT) != 0)
639 ahc->bus_intr(ahc);
640 }
641 #endif
642 ahc->unsolicited_ints++;
643 return 1;
644 }
645 ahc->unsolicited_ints = 0;
646
647 if (intstat & BRKADRINT) {
648 ahc_handle_brkadrint(ahc);
649 /* Fatal error, no more interrupts to handle. */
650 return 1;
651 }
652
653 if ((intstat & (SEQINT|SCSIINT)) != 0)
654 ahc_pause_bug_fix(ahc);
655
656 if ((intstat & SEQINT) != 0)
657 ahc_handle_seqint(ahc, intstat);
658
659 if ((intstat & SCSIINT) != 0)
660 ahc_handle_scsiint(ahc, intstat);
661
662 return 1;
663 }
664
665 #endif /* _AIC7XXX_INLINE_H_ */
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