aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/firewire/fw-transaction.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/firewire/fw-transaction.c')
-rw-r--r--drivers/firewire/fw-transaction.c910
1 files changed, 910 insertions, 0 deletions
diff --git a/drivers/firewire/fw-transaction.c b/drivers/firewire/fw-transaction.c
new file mode 100644
index 000000000000..80d0121463d0
--- /dev/null
+++ b/drivers/firewire/fw-transaction.c
@@ -0,0 +1,910 @@
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
61static int
62close_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 */
91int
92fw_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}
111EXPORT_SYMBOL(fw_cancel_transaction);
112
113static void
114transmit_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
148static void
149fw_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 */
243void
244fw_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}
295EXPORT_SYMBOL(fw_send_request);
296
297static void
298transmit_phy_packet_callback(struct fw_packet *packet,
299 struct fw_card *card, int status)
300{
301 kfree(packet);
302}
303
304static 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
323void 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
335void 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
359static struct fw_address_handler *
360lookup_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
374static struct fw_address_handler *
375lookup_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
389static DEFINE_SPINLOCK(address_handler_lock);
390static LIST_HEAD(address_handler_list);
391
392const struct fw_address_region fw_low_memory_region =
393 { .start = 0x000000000000ULL, .end = 0x000100000000ULL, };
394const struct fw_address_region fw_high_memory_region =
395 { .start = 0x000100000000ULL, .end = 0xffffe0000000ULL, };
396const struct fw_address_region fw_private_region =
397 { .start = 0xffffe0000000ULL, .end = 0xfffff0000000ULL, };
398const struct fw_address_region fw_csr_region =
399 { .start = 0xfffff0000000ULL, .end = 0xfffff0000800ULL, };
400const struct fw_address_region fw_unit_space_region =
401 { .start = 0xfffff0000900ULL, .end = 0x1000000000000ULL, };
402EXPORT_SYMBOL(fw_low_memory_region);
403EXPORT_SYMBOL(fw_high_memory_region);
404EXPORT_SYMBOL(fw_private_region);
405EXPORT_SYMBOL(fw_csr_region);
406EXPORT_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 */
415int
416fw_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}
444EXPORT_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 */
454void 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}
462EXPORT_SYMBOL(fw_core_remove_address_handler);
463
464struct fw_request {
465 struct fw_packet response;
466 u32 request_header[4];
467 int ack;
468 u32 length;
469 u32 data[0];
470};
471
472static void
473free_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
482void
483fw_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}
538EXPORT_SYMBOL(fw_fill_response);
539
540static struct fw_request *
541allocate_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
600void
601fw_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}
620EXPORT_SYMBOL(fw_send_response);
621
622void
623fw_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->payload_length > 2048) {
632 /* FIXME: send error response. */
633 return;
634 }
635
636 if (p->ack != ACK_PENDING && p->ack != ACK_COMPLETE)
637 return;
638
639 request = allocate_request(p);
640 if (request == NULL) {
641 /* FIXME: send statically allocated busy packet. */
642 return;
643 }
644
645 offset =
646 ((unsigned long long)
647 HEADER_GET_OFFSET_HIGH(p->header[1]) << 32) | p->header[2];
648 tcode = HEADER_GET_TCODE(p->header[0]);
649 destination = HEADER_GET_DESTINATION(p->header[0]);
650 source = HEADER_GET_SOURCE(p->header[0]);
651
652 spin_lock_irqsave(&address_handler_lock, flags);
653 handler = lookup_enclosing_address_handler(&address_handler_list,
654 offset, request->length);
655 spin_unlock_irqrestore(&address_handler_lock, flags);
656
657 /*
658 * FIXME: lookup the fw_node corresponding to the sender of
659 * this request and pass that to the address handler instead
660 * of the node ID. We may also want to move the address
661 * allocations to fw_node so we only do this callback if the
662 * upper layers registered it for this node.
663 */
664
665 if (handler == NULL)
666 fw_send_response(card, request, RCODE_ADDRESS_ERROR);
667 else
668 handler->address_callback(card, request,
669 tcode, destination, source,
670 p->generation, p->speed, offset,
671 request->data, request->length,
672 handler->callback_data);
673}
674EXPORT_SYMBOL(fw_core_handle_request);
675
676void
677fw_core_handle_response(struct fw_card *card, struct fw_packet *p)
678{
679 struct fw_transaction *t;
680 unsigned long flags;
681 u32 *data;
682 size_t data_length;
683 int tcode, tlabel, destination, source, rcode;
684
685 tcode = HEADER_GET_TCODE(p->header[0]);
686 tlabel = HEADER_GET_TLABEL(p->header[0]);
687 destination = HEADER_GET_DESTINATION(p->header[0]);
688 source = HEADER_GET_SOURCE(p->header[1]);
689 rcode = HEADER_GET_RCODE(p->header[1]);
690
691 spin_lock_irqsave(&card->lock, flags);
692 list_for_each_entry(t, &card->transaction_list, link) {
693 if (t->node_id == source && t->tlabel == tlabel) {
694 list_del(&t->link);
695 card->tlabel_mask &= ~(1 << t->tlabel);
696 break;
697 }
698 }
699 spin_unlock_irqrestore(&card->lock, flags);
700
701 if (&t->link == &card->transaction_list) {
702 fw_notify("Unsolicited response (source %x, tlabel %x)\n",
703 source, tlabel);
704 return;
705 }
706
707 /*
708 * FIXME: sanity check packet, is length correct, does tcodes
709 * and addresses match.
710 */
711
712 switch (tcode) {
713 case TCODE_READ_QUADLET_RESPONSE:
714 data = (u32 *) &p->header[3];
715 data_length = 4;
716 break;
717
718 case TCODE_WRITE_RESPONSE:
719 data = NULL;
720 data_length = 0;
721 break;
722
723 case TCODE_READ_BLOCK_RESPONSE:
724 case TCODE_LOCK_RESPONSE:
725 data = p->payload;
726 data_length = HEADER_GET_DATA_LENGTH(p->header[3]);
727 break;
728
729 default:
730 /* Should never happen, this is just to shut up gcc. */
731 data = NULL;
732 data_length = 0;
733 break;
734 }
735
736 t->callback(card, rcode, data, data_length, t->callback_data);
737}
738EXPORT_SYMBOL(fw_core_handle_response);
739
740const struct fw_address_region topology_map_region =
741 { .start = 0xfffff0001000ull, .end = 0xfffff0001400ull, };
742
743static void
744handle_topology_map(struct fw_card *card, struct fw_request *request,
745 int tcode, int destination, int source,
746 int generation, int speed,
747 unsigned long long offset,
748 void *payload, size_t length, void *callback_data)
749{
750 int i, start, end;
751 u32 *map;
752
753 if (!TCODE_IS_READ_REQUEST(tcode)) {
754 fw_send_response(card, request, RCODE_TYPE_ERROR);
755 return;
756 }
757
758 if ((offset & 3) > 0 || (length & 3) > 0) {
759 fw_send_response(card, request, RCODE_ADDRESS_ERROR);
760 return;
761 }
762
763 start = (offset - topology_map_region.start) / 4;
764 end = start + length / 4;
765 map = payload;
766
767 for (i = 0; i < length / 4; i++)
768 map[i] = cpu_to_be32(card->topology_map[start + i]);
769
770 fw_send_response(card, request, RCODE_COMPLETE);
771}
772
773static struct fw_address_handler topology_map = {
774 .length = 0x200,
775 .address_callback = handle_topology_map,
776};
777
778const struct fw_address_region registers_region =
779 { .start = 0xfffff0000000ull, .end = 0xfffff0000400ull, };
780
781static void
782handle_registers(struct fw_card *card, struct fw_request *request,
783 int tcode, int destination, int source,
784 int generation, int speed,
785 unsigned long long offset,
786 void *payload, size_t length, void *callback_data)
787{
788 int reg = offset - CSR_REGISTER_BASE;
789 unsigned long long bus_time;
790 __be32 *data = payload;
791
792 switch (reg) {
793 case CSR_CYCLE_TIME:
794 case CSR_BUS_TIME:
795 if (!TCODE_IS_READ_REQUEST(tcode) || length != 4) {
796 fw_send_response(card, request, RCODE_TYPE_ERROR);
797 break;
798 }
799
800 bus_time = card->driver->get_bus_time(card);
801 if (reg == CSR_CYCLE_TIME)
802 *data = cpu_to_be32(bus_time);
803 else
804 *data = cpu_to_be32(bus_time >> 25);
805 fw_send_response(card, request, RCODE_COMPLETE);
806 break;
807
808 case CSR_BUS_MANAGER_ID:
809 case CSR_BANDWIDTH_AVAILABLE:
810 case CSR_CHANNELS_AVAILABLE_HI:
811 case CSR_CHANNELS_AVAILABLE_LO:
812 /*
813 * FIXME: these are handled by the OHCI hardware and
814 * the stack never sees these request. If we add
815 * support for a new type of controller that doesn't
816 * handle this in hardware we need to deal with these
817 * transactions.
818 */
819 BUG();
820 break;
821
822 case CSR_BUSY_TIMEOUT:
823 /* FIXME: Implement this. */
824 default:
825 fw_send_response(card, request, RCODE_ADDRESS_ERROR);
826 break;
827 }
828}
829
830static struct fw_address_handler registers = {
831 .length = 0x400,
832 .address_callback = handle_registers,
833};
834
835MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
836MODULE_DESCRIPTION("Core IEEE1394 transaction logic");
837MODULE_LICENSE("GPL");
838
839static const u32 vendor_textual_descriptor[] = {
840 /* textual descriptor leaf () */
841 0x00060000,
842 0x00000000,
843 0x00000000,
844 0x4c696e75, /* L i n u */
845 0x78204669, /* x F i */
846 0x72657769, /* r e w i */
847 0x72650000, /* r e */
848};
849
850static const u32 model_textual_descriptor[] = {
851 /* model descriptor leaf () */
852 0x00030000,
853 0x00000000,
854 0x00000000,
855 0x4a756a75, /* J u j u */
856};
857
858static struct fw_descriptor vendor_id_descriptor = {
859 .length = ARRAY_SIZE(vendor_textual_descriptor),
860 .immediate = 0x03d00d1e,
861 .key = 0x81000000,
862 .data = vendor_textual_descriptor,
863};
864
865static struct fw_descriptor model_id_descriptor = {
866 .length = ARRAY_SIZE(model_textual_descriptor),
867 .immediate = 0x17000001,
868 .key = 0x81000000,
869 .data = model_textual_descriptor,
870};
871
872static int __init fw_core_init(void)
873{
874 int retval;
875
876 retval = bus_register(&fw_bus_type);
877 if (retval < 0)
878 return retval;
879
880 fw_cdev_major = register_chrdev(0, "firewire", &fw_device_ops);
881 if (fw_cdev_major < 0) {
882 bus_unregister(&fw_bus_type);
883 return fw_cdev_major;
884 }
885
886 retval = fw_core_add_address_handler(&topology_map,
887 &topology_map_region);
888 BUG_ON(retval < 0);
889
890 retval = fw_core_add_address_handler(&registers,
891 &registers_region);
892 BUG_ON(retval < 0);
893
894 /* Add the vendor textual descriptor. */
895 retval = fw_core_add_descriptor(&vendor_id_descriptor);
896 BUG_ON(retval < 0);
897 retval = fw_core_add_descriptor(&model_id_descriptor);
898 BUG_ON(retval < 0);
899
900 return 0;
901}
902
903static void __exit fw_core_cleanup(void)
904{
905 unregister_chrdev(fw_cdev_major, "firewire");
906 bus_unregister(&fw_bus_type);
907}
908
909module_init(fw_core_init);
910module_exit(fw_core_cleanup);
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-22 13:54:22 -0500