firewire: remove bogus check in fw_core_handle_request
[linux-2.6.git] / drivers / firewire / fw-transaction.c
1 /*
2  * Core IEEE1394 transaction logic
3  *
4  * Copyright (C) 2004-2006 Kristian Hoegsberg <krh@bitplanet.net>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software Foundation,
18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19  */
20
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/interrupt.h>
25 #include <linux/pci.h>
26 #include <linux/delay.h>
27 #include <linux/poll.h>
28 #include <linux/list.h>
29 #include <linux/kthread.h>
30 #include <asm/uaccess.h>
31 #include <asm/semaphore.h>
32
33 #include "fw-transaction.h"
34 #include "fw-topology.h"
35 #include "fw-device.h"
36
37 #define HEADER_PRI(pri)                 ((pri) << 0)
38 #define HEADER_TCODE(tcode)             ((tcode) << 4)
39 #define HEADER_RETRY(retry)             ((retry) << 8)
40 #define HEADER_TLABEL(tlabel)           ((tlabel) << 10)
41 #define HEADER_DESTINATION(destination) ((destination) << 16)
42 #define HEADER_SOURCE(source)           ((source) << 16)
43 #define HEADER_RCODE(rcode)             ((rcode) << 12)
44 #define HEADER_OFFSET_HIGH(offset_high) ((offset_high) << 0)
45 #define HEADER_DATA_LENGTH(length)      ((length) << 16)
46 #define HEADER_EXTENDED_TCODE(tcode)    ((tcode) << 0)
47
48 #define HEADER_GET_TCODE(q)             (((q) >> 4) & 0x0f)
49 #define HEADER_GET_TLABEL(q)            (((q) >> 10) & 0x3f)
50 #define HEADER_GET_RCODE(q)             (((q) >> 12) & 0x0f)
51 #define HEADER_GET_DESTINATION(q)       (((q) >> 16) & 0xffff)
52 #define HEADER_GET_SOURCE(q)            (((q) >> 16) & 0xffff)
53 #define HEADER_GET_OFFSET_HIGH(q)       (((q) >> 0) & 0xffff)
54 #define HEADER_GET_DATA_LENGTH(q)       (((q) >> 16) & 0xffff)
55 #define HEADER_GET_EXTENDED_TCODE(q)    (((q) >> 0) & 0xffff)
56
57 #define PHY_CONFIG_GAP_COUNT(gap_count) (((gap_count) << 16) | (1 << 22))
58 #define PHY_CONFIG_ROOT_ID(node_id)     ((((node_id) & 0x3f) << 24) | (1 << 23))
59 #define PHY_IDENTIFIER(id)              ((id) << 30)
60
61 static int
62 close_transaction(struct fw_transaction *transaction,
63                   struct fw_card *card, int rcode,
64                   u32 *payload, size_t length)
65 {
66         struct fw_transaction *t;
67         unsigned long flags;
68
69         spin_lock_irqsave(&card->lock, flags);
70         list_for_each_entry(t, &card->transaction_list, link) {
71                 if (t == transaction) {
72                         list_del(&t->link);
73                         card->tlabel_mask &= ~(1 << t->tlabel);
74                         break;
75                 }
76         }
77         spin_unlock_irqrestore(&card->lock, flags);
78
79         if (&t->link != &card->transaction_list) {
80                 t->callback(card, rcode, payload, length, t->callback_data);
81                 return 0;
82         }
83
84         return -ENOENT;
85 }
86
87 /*
88  * Only valid for transactions that are potentially pending (ie have
89  * been sent).
90  */
91 int
92 fw_cancel_transaction(struct fw_card *card,
93                       struct fw_transaction *transaction)
94 {
95         /*
96          * Cancel the packet transmission if it's still queued.  That
97          * will call the packet transmission callback which cancels
98          * the transaction.
99          */
100
101         if (card->driver->cancel_packet(card, &transaction->packet) == 0)
102                 return 0;
103
104         /*
105          * If the request packet has already been sent, we need to see
106          * if the transaction is still pending and remove it in that case.
107          */
108
109         return close_transaction(transaction, card, RCODE_CANCELLED, NULL, 0);
110 }
111 EXPORT_SYMBOL(fw_cancel_transaction);
112
113 static void
114 transmit_complete_callback(struct fw_packet *packet,
115                            struct fw_card *card, int status)
116 {
117         struct fw_transaction *t =
118             container_of(packet, struct fw_transaction, packet);
119
120         switch (status) {
121         case ACK_COMPLETE:
122                 close_transaction(t, card, RCODE_COMPLETE, NULL, 0);
123                 break;
124         case ACK_PENDING:
125                 t->timestamp = packet->timestamp;
126                 break;
127         case ACK_BUSY_X:
128         case ACK_BUSY_A:
129         case ACK_BUSY_B:
130                 close_transaction(t, card, RCODE_BUSY, NULL, 0);
131                 break;
132         case ACK_DATA_ERROR:
133                 close_transaction(t, card, RCODE_DATA_ERROR, NULL, 0);
134                 break;
135         case ACK_TYPE_ERROR:
136                 close_transaction(t, card, RCODE_TYPE_ERROR, NULL, 0);
137                 break;
138         default:
139                 /*
140                  * In this case the ack is really a juju specific
141                  * rcode, so just forward that to the callback.
142                  */
143                 close_transaction(t, card, status, NULL, 0);
144                 break;
145         }
146 }
147
148 static void
149 fw_fill_request(struct fw_packet *packet, int tcode, int tlabel,
150                 int node_id, int source_id, int generation, int speed,
151                 unsigned long long offset, void *payload, size_t length)
152 {
153         int ext_tcode;
154
155         if (tcode > 0x10) {
156                 ext_tcode = tcode - 0x10;
157                 tcode = TCODE_LOCK_REQUEST;
158         } else
159                 ext_tcode = 0;
160
161         packet->header[0] =
162                 HEADER_RETRY(RETRY_X) |
163                 HEADER_TLABEL(tlabel) |
164                 HEADER_TCODE(tcode) |
165                 HEADER_DESTINATION(node_id);
166         packet->header[1] =
167                 HEADER_OFFSET_HIGH(offset >> 32) | HEADER_SOURCE(source_id);
168         packet->header[2] =
169                 offset;
170
171         switch (tcode) {
172         case TCODE_WRITE_QUADLET_REQUEST:
173                 packet->header[3] = *(u32 *)payload;
174                 packet->header_length = 16;
175                 packet->payload_length = 0;
176                 break;
177
178         case TCODE_LOCK_REQUEST:
179         case TCODE_WRITE_BLOCK_REQUEST:
180                 packet->header[3] =
181                         HEADER_DATA_LENGTH(length) |
182                         HEADER_EXTENDED_TCODE(ext_tcode);
183                 packet->header_length = 16;
184                 packet->payload = payload;
185                 packet->payload_length = length;
186                 break;
187
188         case TCODE_READ_QUADLET_REQUEST:
189                 packet->header_length = 12;
190                 packet->payload_length = 0;
191                 break;
192
193         case TCODE_READ_BLOCK_REQUEST:
194                 packet->header[3] =
195                         HEADER_DATA_LENGTH(length) |
196                         HEADER_EXTENDED_TCODE(ext_tcode);
197                 packet->header_length = 16;
198                 packet->payload_length = 0;
199                 break;
200         }
201
202         packet->speed = speed;
203         packet->generation = generation;
204         packet->ack = 0;
205 }
206
207 /**
208  * This function provides low-level access to the IEEE1394 transaction
209  * logic.  Most C programs would use either fw_read(), fw_write() or
210  * fw_lock() instead - those function are convenience wrappers for
211  * this function.  The fw_send_request() function is primarily
212  * provided as a flexible, one-stop entry point for languages bindings
213  * and protocol bindings.
214  *
215  * FIXME: Document this function further, in particular the possible
216  * values for rcode in the callback.  In short, we map ACK_COMPLETE to
217  * RCODE_COMPLETE, internal errors set errno and set rcode to
218  * RCODE_SEND_ERROR (which is out of range for standard ieee1394
219  * rcodes).  All other rcodes are forwarded unchanged.  For all
220  * errors, payload is NULL, length is 0.
221  *
222  * Can not expect the callback to be called before the function
223  * returns, though this does happen in some cases (ACK_COMPLETE and
224  * errors).
225  *
226  * The payload is only used for write requests and must not be freed
227  * until the callback has been called.
228  *
229  * @param card the card from which to send the request
230  * @param tcode the tcode for this transaction.  Do not use
231  *   TCODE_LOCK_REQUEST directly, insted use TCODE_LOCK_MASK_SWAP
232  *   etc. to specify tcode and ext_tcode.
233  * @param node_id the destination node ID (bus ID and PHY ID concatenated)
234  * @param generation the generation for which node_id is valid
235  * @param speed the speed to use for sending the request
236  * @param offset the 48 bit offset on the destination node
237  * @param payload the data payload for the request subaction
238  * @param length the length in bytes of the data to read
239  * @param callback function to be called when the transaction is completed
240  * @param callback_data pointer to arbitrary data, which will be
241  *   passed to the callback
242  */
243 void
244 fw_send_request(struct fw_card *card, struct fw_transaction *t,
245                 int tcode, int node_id, int generation, int speed,
246                 unsigned long long offset,
247                 void *payload, size_t length,
248                 fw_transaction_callback_t callback, void *callback_data)
249 {
250         unsigned long flags;
251         int tlabel, source;
252
253         /*
254          * Bump the flush timer up 100ms first of all so we
255          * don't race with a flush timer callback.
256          */
257
258         mod_timer(&card->flush_timer, jiffies + DIV_ROUND_UP(HZ, 10));
259
260         /*
261          * Allocate tlabel from the bitmap and put the transaction on
262          * the list while holding the card spinlock.
263          */
264
265         spin_lock_irqsave(&card->lock, flags);
266
267         source = card->node_id;
268         tlabel = card->current_tlabel;
269         if (card->tlabel_mask & (1 << tlabel)) {
270                 spin_unlock_irqrestore(&card->lock, flags);
271                 callback(card, RCODE_SEND_ERROR, NULL, 0, callback_data);
272                 return;
273         }
274
275         card->current_tlabel = (card->current_tlabel + 1) & 0x1f;
276         card->tlabel_mask |= (1 << tlabel);
277
278         list_add_tail(&t->link, &card->transaction_list);
279
280         spin_unlock_irqrestore(&card->lock, flags);
281
282         /* Initialize rest of transaction, fill out packet and send it. */
283         t->node_id = node_id;
284         t->tlabel = tlabel;
285         t->callback = callback;
286         t->callback_data = callback_data;
287
288         fw_fill_request(&t->packet, tcode, t->tlabel,
289                         node_id, source, generation,
290                         speed, offset, payload, length);
291         t->packet.callback = transmit_complete_callback;
292
293         card->driver->send_request(card, &t->packet);
294 }
295 EXPORT_SYMBOL(fw_send_request);
296
297 static void
298 transmit_phy_packet_callback(struct fw_packet *packet,
299                              struct fw_card *card, int status)
300 {
301         kfree(packet);
302 }
303
304 static void send_phy_packet(struct fw_card *card, u32 data, int generation)
305 {
306         struct fw_packet *packet;
307
308         packet = kzalloc(sizeof(*packet), GFP_ATOMIC);
309         if (packet == NULL)
310                 return;
311
312         packet->header[0] = data;
313         packet->header[1] = ~data;
314         packet->header_length = 8;
315         packet->payload_length = 0;
316         packet->speed = SCODE_100;
317         packet->generation = generation;
318         packet->callback = transmit_phy_packet_callback;
319
320         card->driver->send_request(card, packet);
321 }
322
323 void fw_send_phy_config(struct fw_card *card,
324                         int node_id, int generation, int gap_count)
325 {
326         u32 q;
327
328         q = PHY_IDENTIFIER(PHY_PACKET_CONFIG) |
329                 PHY_CONFIG_ROOT_ID(node_id) |
330                 PHY_CONFIG_GAP_COUNT(gap_count);
331
332         send_phy_packet(card, q, generation);
333 }
334
335 void fw_flush_transactions(struct fw_card *card)
336 {
337         struct fw_transaction *t, *next;
338         struct list_head list;
339         unsigned long flags;
340
341         INIT_LIST_HEAD(&list);
342         spin_lock_irqsave(&card->lock, flags);
343         list_splice_init(&card->transaction_list, &list);
344         card->tlabel_mask = 0;
345         spin_unlock_irqrestore(&card->lock, flags);
346
347         list_for_each_entry_safe(t, next, &list, link) {
348                 card->driver->cancel_packet(card, &t->packet);
349
350                 /*
351                  * At this point cancel_packet will never call the
352                  * transaction callback, since we just took all the
353                  * transactions out of the list.  So do it here.
354                  */
355                 t->callback(card, RCODE_CANCELLED, NULL, 0, t->callback_data);
356         }
357 }
358
359 static struct fw_address_handler *
360 lookup_overlapping_address_handler(struct list_head *list,
361                                    unsigned long long offset, size_t length)
362 {
363         struct fw_address_handler *handler;
364
365         list_for_each_entry(handler, list, link) {
366                 if (handler->offset < offset + length &&
367                     offset < handler->offset + handler->length)
368                         return handler;
369         }
370
371         return NULL;
372 }
373
374 static struct fw_address_handler *
375 lookup_enclosing_address_handler(struct list_head *list,
376                                  unsigned long long offset, size_t length)
377 {
378         struct fw_address_handler *handler;
379
380         list_for_each_entry(handler, list, link) {
381                 if (handler->offset <= offset &&
382                     offset + length <= handler->offset + handler->length)
383                         return handler;
384         }
385
386         return NULL;
387 }
388
389 static DEFINE_SPINLOCK(address_handler_lock);
390 static LIST_HEAD(address_handler_list);
391
392 const struct fw_address_region fw_low_memory_region =
393         { .start = 0x000000000000ULL, .end = 0x000100000000ULL,  };
394 const struct fw_address_region fw_high_memory_region =
395         { .start = 0x000100000000ULL, .end = 0xffffe0000000ULL,  };
396 const struct fw_address_region fw_private_region =
397         { .start = 0xffffe0000000ULL, .end = 0xfffff0000000ULL,  };
398 const struct fw_address_region fw_csr_region =
399         { .start = 0xfffff0000000ULL, .end = 0xfffff0000800ULL,  };
400 const struct fw_address_region fw_unit_space_region =
401         { .start = 0xfffff0000900ULL, .end = 0x1000000000000ULL, };
402 EXPORT_SYMBOL(fw_low_memory_region);
403 EXPORT_SYMBOL(fw_high_memory_region);
404 EXPORT_SYMBOL(fw_private_region);
405 EXPORT_SYMBOL(fw_csr_region);
406 EXPORT_SYMBOL(fw_unit_space_region);
407
408 /**
409  * Allocate a range of addresses in the node space of the OHCI
410  * controller.  When a request is received that falls within the
411  * specified address range, the specified callback is invoked.  The
412  * parameters passed to the callback give the details of the
413  * particular request
414  */
415 int
416 fw_core_add_address_handler(struct fw_address_handler *handler,
417                             const struct fw_address_region *region)
418 {
419         struct fw_address_handler *other;
420         unsigned long flags;
421         int ret = -EBUSY;
422
423         spin_lock_irqsave(&address_handler_lock, flags);
424
425         handler->offset = region->start;
426         while (handler->offset + handler->length <= region->end) {
427                 other =
428                     lookup_overlapping_address_handler(&address_handler_list,
429                                                        handler->offset,
430                                                        handler->length);
431                 if (other != NULL) {
432                         handler->offset += other->length;
433                 } else {
434                         list_add_tail(&handler->link, &address_handler_list);
435                         ret = 0;
436                         break;
437                 }
438         }
439
440         spin_unlock_irqrestore(&address_handler_lock, flags);
441
442         return ret;
443 }
444 EXPORT_SYMBOL(fw_core_add_address_handler);
445
446 /**
447  * Deallocate a range of addresses allocated with fw_allocate.  This
448  * will call the associated callback one last time with a the special
449  * tcode TCODE_DEALLOCATE, to let the client destroy the registered
450  * callback data.  For convenience, the callback parameters offset and
451  * length are set to the start and the length respectively for the
452  * deallocated region, payload is set to NULL.
453  */
454 void fw_core_remove_address_handler(struct fw_address_handler *handler)
455 {
456         unsigned long flags;
457
458         spin_lock_irqsave(&address_handler_lock, flags);
459         list_del(&handler->link);
460         spin_unlock_irqrestore(&address_handler_lock, flags);
461 }
462 EXPORT_SYMBOL(fw_core_remove_address_handler);
463
464 struct fw_request {
465         struct fw_packet response;
466         u32 request_header[4];
467         int ack;
468         u32 length;
469         u32 data[0];
470 };
471
472 static void
473 free_response_callback(struct fw_packet *packet,
474                        struct fw_card *card, int status)
475 {
476         struct fw_request *request;
477
478         request = container_of(packet, struct fw_request, response);
479         kfree(request);
480 }
481
482 void
483 fw_fill_response(struct fw_packet *response, u32 *request_header,
484                  int rcode, void *payload, size_t length)
485 {
486         int tcode, tlabel, extended_tcode, source, destination;
487
488         tcode          = HEADER_GET_TCODE(request_header[0]);
489         tlabel         = HEADER_GET_TLABEL(request_header[0]);
490         source         = HEADER_GET_DESTINATION(request_header[0]);
491         destination    = HEADER_GET_SOURCE(request_header[1]);
492         extended_tcode = HEADER_GET_EXTENDED_TCODE(request_header[3]);
493
494         response->header[0] =
495                 HEADER_RETRY(RETRY_1) |
496                 HEADER_TLABEL(tlabel) |
497                 HEADER_DESTINATION(destination);
498         response->header[1] =
499                 HEADER_SOURCE(source) |
500                 HEADER_RCODE(rcode);
501         response->header[2] = 0;
502
503         switch (tcode) {
504         case TCODE_WRITE_QUADLET_REQUEST:
505         case TCODE_WRITE_BLOCK_REQUEST:
506                 response->header[0] |= HEADER_TCODE(TCODE_WRITE_RESPONSE);
507                 response->header_length = 12;
508                 response->payload_length = 0;
509                 break;
510
511         case TCODE_READ_QUADLET_REQUEST:
512                 response->header[0] |=
513                         HEADER_TCODE(TCODE_READ_QUADLET_RESPONSE);
514                 if (payload != NULL)
515                         response->header[3] = *(u32 *)payload;
516                 else
517                         response->header[3] = 0;
518                 response->header_length = 16;
519                 response->payload_length = 0;
520                 break;
521
522         case TCODE_READ_BLOCK_REQUEST:
523         case TCODE_LOCK_REQUEST:
524                 response->header[0] |= HEADER_TCODE(tcode + 2);
525                 response->header[3] =
526                         HEADER_DATA_LENGTH(length) |
527                         HEADER_EXTENDED_TCODE(extended_tcode);
528                 response->header_length = 16;
529                 response->payload = payload;
530                 response->payload_length = length;
531                 break;
532
533         default:
534                 BUG();
535                 return;
536         }
537 }
538 EXPORT_SYMBOL(fw_fill_response);
539
540 static struct fw_request *
541 allocate_request(struct fw_packet *p)
542 {
543         struct fw_request *request;
544         u32 *data, length;
545         int request_tcode, t;
546
547         request_tcode = HEADER_GET_TCODE(p->header[0]);
548         switch (request_tcode) {
549         case TCODE_WRITE_QUADLET_REQUEST:
550                 data = &p->header[3];
551                 length = 4;
552                 break;
553
554         case TCODE_WRITE_BLOCK_REQUEST:
555         case TCODE_LOCK_REQUEST:
556                 data = p->payload;
557                 length = HEADER_GET_DATA_LENGTH(p->header[3]);
558                 break;
559
560         case TCODE_READ_QUADLET_REQUEST:
561                 data = NULL;
562                 length = 4;
563                 break;
564
565         case TCODE_READ_BLOCK_REQUEST:
566                 data = NULL;
567                 length = HEADER_GET_DATA_LENGTH(p->header[3]);
568                 break;
569
570         default:
571                 BUG();
572                 return NULL;
573         }
574
575         request = kmalloc(sizeof(*request) + length, GFP_ATOMIC);
576         if (request == NULL)
577                 return NULL;
578
579         t = (p->timestamp & 0x1fff) + 4000;
580         if (t >= 8000)
581                 t = (p->timestamp & ~0x1fff) + 0x2000 + t - 8000;
582         else
583                 t = (p->timestamp & ~0x1fff) + t;
584
585         request->response.speed = p->speed;
586         request->response.timestamp = t;
587         request->response.generation = p->generation;
588         request->response.ack = 0;
589         request->response.callback = free_response_callback;
590         request->ack = p->ack;
591         request->length = length;
592         if (data)
593                 memcpy(request->data, data, length);
594
595         memcpy(request->request_header, p->header, sizeof(p->header));
596
597         return request;
598 }
599
600 void
601 fw_send_response(struct fw_card *card, struct fw_request *request, int rcode)
602 {
603         /*
604          * Broadcast packets are reported as ACK_COMPLETE, so this
605          * check is sufficient to ensure we don't send response to
606          * broadcast packets or posted writes.
607          */
608         if (request->ack != ACK_PENDING)
609                 return;
610
611         if (rcode == RCODE_COMPLETE)
612                 fw_fill_response(&request->response, request->request_header,
613                                  rcode, request->data, request->length);
614         else
615                 fw_fill_response(&request->response, request->request_header,
616                                  rcode, NULL, 0);
617
618         card->driver->send_response(card, &request->response);
619 }
620 EXPORT_SYMBOL(fw_send_response);
621
622 void
623 fw_core_handle_request(struct fw_card *card, struct fw_packet *p)
624 {
625         struct fw_address_handler *handler;
626         struct fw_request *request;
627         unsigned long long offset;
628         unsigned long flags;
629         int tcode, destination, source;
630
631         if (p->ack != ACK_PENDING && p->ack != ACK_COMPLETE)
632                 return;
633
634         request = allocate_request(p);
635         if (request == NULL) {
636                 /* FIXME: send statically allocated busy packet. */
637                 return;
638         }
639
640         offset      =
641                 ((unsigned long long)
642                  HEADER_GET_OFFSET_HIGH(p->header[1]) << 32) | p->header[2];
643         tcode       = HEADER_GET_TCODE(p->header[0]);
644         destination = HEADER_GET_DESTINATION(p->header[0]);
645         source      = HEADER_GET_SOURCE(p->header[0]);
646
647         spin_lock_irqsave(&address_handler_lock, flags);
648         handler = lookup_enclosing_address_handler(&address_handler_list,
649                                                    offset, request->length);
650         spin_unlock_irqrestore(&address_handler_lock, flags);
651
652         /*
653          * FIXME: lookup the fw_node corresponding to the sender of
654          * this request and pass that to the address handler instead
655          * of the node ID.  We may also want to move the address
656          * allocations to fw_node so we only do this callback if the
657          * upper layers registered it for this node.
658          */
659
660         if (handler == NULL)
661                 fw_send_response(card, request, RCODE_ADDRESS_ERROR);
662         else
663                 handler->address_callback(card, request,
664                                           tcode, destination, source,
665                                           p->generation, p->speed, offset,
666                                           request->data, request->length,
667                                           handler->callback_data);
668 }
669 EXPORT_SYMBOL(fw_core_handle_request);
670
671 void
672 fw_core_handle_response(struct fw_card *card, struct fw_packet *p)
673 {
674         struct fw_transaction *t;
675         unsigned long flags;
676         u32 *data;
677         size_t data_length;
678         int tcode, tlabel, destination, source, rcode;
679
680         tcode       = HEADER_GET_TCODE(p->header[0]);
681         tlabel      = HEADER_GET_TLABEL(p->header[0]);
682         destination = HEADER_GET_DESTINATION(p->header[0]);
683         source      = HEADER_GET_SOURCE(p->header[1]);
684         rcode       = HEADER_GET_RCODE(p->header[1]);
685
686         spin_lock_irqsave(&card->lock, flags);
687         list_for_each_entry(t, &card->transaction_list, link) {
688                 if (t->node_id == source && t->tlabel == tlabel) {
689                         list_del(&t->link);
690                         card->tlabel_mask &= ~(1 << t->tlabel);
691                         break;
692                 }
693         }
694         spin_unlock_irqrestore(&card->lock, flags);
695
696         if (&t->link == &card->transaction_list) {
697                 fw_notify("Unsolicited response (source %x, tlabel %x)\n",
698                           source, tlabel);
699                 return;
700         }
701
702         /*
703          * FIXME: sanity check packet, is length correct, does tcodes
704          * and addresses match.
705          */
706
707         switch (tcode) {
708         case TCODE_READ_QUADLET_RESPONSE:
709                 data = (u32 *) &p->header[3];
710                 data_length = 4;
711                 break;
712
713         case TCODE_WRITE_RESPONSE:
714                 data = NULL;
715                 data_length = 0;
716                 break;
717
718         case TCODE_READ_BLOCK_RESPONSE:
719         case TCODE_LOCK_RESPONSE:
720                 data = p->payload;
721                 data_length = HEADER_GET_DATA_LENGTH(p->header[3]);
722                 break;
723
724         default:
725                 /* Should never happen, this is just to shut up gcc. */
726                 data = NULL;
727                 data_length = 0;
728                 break;
729         }
730
731         t->callback(card, rcode, data, data_length, t->callback_data);
732 }
733 EXPORT_SYMBOL(fw_core_handle_response);
734
735 const struct fw_address_region topology_map_region =
736         { .start = 0xfffff0001000ull, .end = 0xfffff0001400ull, };
737
738 static void
739 handle_topology_map(struct fw_card *card, struct fw_request *request,
740                     int tcode, int destination, int source,
741                     int generation, int speed,
742                     unsigned long long offset,
743                     void *payload, size_t length, void *callback_data)
744 {
745         int i, start, end;
746         u32 *map;
747
748         if (!TCODE_IS_READ_REQUEST(tcode)) {
749                 fw_send_response(card, request, RCODE_TYPE_ERROR);
750                 return;
751         }
752
753         if ((offset & 3) > 0 || (length & 3) > 0) {
754                 fw_send_response(card, request, RCODE_ADDRESS_ERROR);
755                 return;
756         }
757
758         start = (offset - topology_map_region.start) / 4;
759         end = start + length / 4;
760         map = payload;
761
762         for (i = 0; i < length / 4; i++)
763                 map[i] = cpu_to_be32(card->topology_map[start + i]);
764
765         fw_send_response(card, request, RCODE_COMPLETE);
766 }
767
768 static struct fw_address_handler topology_map = {
769         .length                 = 0x200,
770         .address_callback       = handle_topology_map,
771 };
772
773 const struct fw_address_region registers_region =
774         { .start = 0xfffff0000000ull, .end = 0xfffff0000400ull, };
775
776 static void
777 handle_registers(struct fw_card *card, struct fw_request *request,
778                  int tcode, int destination, int source,
779                  int generation, int speed,
780                  unsigned long long offset,
781                  void *payload, size_t length, void *callback_data)
782 {
783         int reg = offset - CSR_REGISTER_BASE;
784         unsigned long long bus_time;
785         __be32 *data = payload;
786
787         switch (reg) {
788         case CSR_CYCLE_TIME:
789         case CSR_BUS_TIME:
790                 if (!TCODE_IS_READ_REQUEST(tcode) || length != 4) {
791                         fw_send_response(card, request, RCODE_TYPE_ERROR);
792                         break;
793                 }
794
795                 bus_time = card->driver->get_bus_time(card);
796                 if (reg == CSR_CYCLE_TIME)
797                         *data = cpu_to_be32(bus_time);
798                 else
799                         *data = cpu_to_be32(bus_time >> 25);
800                 fw_send_response(card, request, RCODE_COMPLETE);
801                 break;
802
803         case CSR_BUS_MANAGER_ID:
804         case CSR_BANDWIDTH_AVAILABLE:
805         case CSR_CHANNELS_AVAILABLE_HI:
806         case CSR_CHANNELS_AVAILABLE_LO:
807                 /*
808                  * FIXME: these are handled by the OHCI hardware and
809                  * the stack never sees these request. If we add
810                  * support for a new type of controller that doesn't
811                  * handle this in hardware we need to deal with these
812                  * transactions.
813                  */
814                 BUG();
815                 break;
816
817         case CSR_BUSY_TIMEOUT:
818                 /* FIXME: Implement this. */
819         default:
820                 fw_send_response(card, request, RCODE_ADDRESS_ERROR);
821                 break;
822         }
823 }
824
825 static struct fw_address_handler registers = {
826         .length                 = 0x400,
827         .address_callback       = handle_registers,
828 };
829
830 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
831 MODULE_DESCRIPTION("Core IEEE1394 transaction logic");
832 MODULE_LICENSE("GPL");
833
834 static const u32 vendor_textual_descriptor[] = {
835         /* textual descriptor leaf () */
836         0x00060000,
837         0x00000000,
838         0x00000000,
839         0x4c696e75,             /* L i n u */
840         0x78204669,             /* x   F i */
841         0x72657769,             /* r e w i */
842         0x72650000,             /* r e     */
843 };
844
845 static const u32 model_textual_descriptor[] = {
846         /* model descriptor leaf () */
847         0x00030000,
848         0x00000000,
849         0x00000000,
850         0x4a756a75,             /* J u j u */
851 };
852
853 static struct fw_descriptor vendor_id_descriptor = {
854         .length = ARRAY_SIZE(vendor_textual_descriptor),
855         .immediate = 0x03d00d1e,
856         .key = 0x81000000,
857         .data = vendor_textual_descriptor,
858 };
859
860 static struct fw_descriptor model_id_descriptor = {
861         .length = ARRAY_SIZE(model_textual_descriptor),
862         .immediate = 0x17000001,
863         .key = 0x81000000,
864         .data = model_textual_descriptor,
865 };
866
867 static int __init fw_core_init(void)
868 {
869         int retval;
870
871         retval = bus_register(&fw_bus_type);
872         if (retval < 0)
873                 return retval;
874
875         fw_cdev_major = register_chrdev(0, "firewire", &fw_device_ops);
876         if (fw_cdev_major < 0) {
877                 bus_unregister(&fw_bus_type);
878                 return fw_cdev_major;
879         }
880
881         retval = fw_core_add_address_handler(&topology_map,
882                                              &topology_map_region);
883         BUG_ON(retval < 0);
884
885         retval = fw_core_add_address_handler(&registers,
886                                              &registers_region);
887         BUG_ON(retval < 0);
888
889         /* Add the vendor textual descriptor. */
890         retval = fw_core_add_descriptor(&vendor_id_descriptor);
891         BUG_ON(retval < 0);
892         retval = fw_core_add_descriptor(&model_id_descriptor);
893         BUG_ON(retval < 0);
894
895         return 0;
896 }
897
898 static void __exit fw_core_cleanup(void)
899 {
900         unregister_chrdev(fw_cdev_major, "firewire");
901         bus_unregister(&fw_bus_type);
902 }
903
904 module_init(fw_core_init);
905 module_exit(fw_core_cleanup);