2 * Core IEEE1394 transaction logic
4 * Copyright (C) 2004-2006 Kristian Hoegsberg <krh@bitplanet.net>
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.
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.
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.
21 #include <linux/bug.h>
22 #include <linux/completion.h>
23 #include <linux/device.h>
24 #include <linux/errno.h>
25 #include <linux/firewire.h>
26 #include <linux/firewire-constants.h>
28 #include <linux/init.h>
29 #include <linux/idr.h>
30 #include <linux/jiffies.h>
31 #include <linux/kernel.h>
32 #include <linux/list.h>
33 #include <linux/module.h>
34 #include <linux/rculist.h>
35 #include <linux/slab.h>
36 #include <linux/spinlock.h>
37 #include <linux/string.h>
38 #include <linux/timer.h>
39 #include <linux/types.h>
40 #include <linux/workqueue.h>
42 #include <asm/byteorder.h>
46 #define HEADER_PRI(pri) ((pri) << 0)
47 #define HEADER_TCODE(tcode) ((tcode) << 4)
48 #define HEADER_RETRY(retry) ((retry) << 8)
49 #define HEADER_TLABEL(tlabel) ((tlabel) << 10)
50 #define HEADER_DESTINATION(destination) ((destination) << 16)
51 #define HEADER_SOURCE(source) ((source) << 16)
52 #define HEADER_RCODE(rcode) ((rcode) << 12)
53 #define HEADER_OFFSET_HIGH(offset_high) ((offset_high) << 0)
54 #define HEADER_DATA_LENGTH(length) ((length) << 16)
55 #define HEADER_EXTENDED_TCODE(tcode) ((tcode) << 0)
57 #define HEADER_GET_TCODE(q) (((q) >> 4) & 0x0f)
58 #define HEADER_GET_TLABEL(q) (((q) >> 10) & 0x3f)
59 #define HEADER_GET_RCODE(q) (((q) >> 12) & 0x0f)
60 #define HEADER_GET_DESTINATION(q) (((q) >> 16) & 0xffff)
61 #define HEADER_GET_SOURCE(q) (((q) >> 16) & 0xffff)
62 #define HEADER_GET_OFFSET_HIGH(q) (((q) >> 0) & 0xffff)
63 #define HEADER_GET_DATA_LENGTH(q) (((q) >> 16) & 0xffff)
64 #define HEADER_GET_EXTENDED_TCODE(q) (((q) >> 0) & 0xffff)
66 #define HEADER_DESTINATION_IS_BROADCAST(q) \
67 (((q) & HEADER_DESTINATION(0x3f)) == HEADER_DESTINATION(0x3f))
69 #define PHY_PACKET_CONFIG 0x0
70 #define PHY_PACKET_LINK_ON 0x1
71 #define PHY_PACKET_SELF_ID 0x2
73 #define PHY_CONFIG_GAP_COUNT(gap_count) (((gap_count) << 16) | (1 << 22))
74 #define PHY_CONFIG_ROOT_ID(node_id) ((((node_id) & 0x3f) << 24) | (1 << 23))
75 #define PHY_IDENTIFIER(id) ((id) << 30)
77 /* returns 0 if the split timeout handler is already running */
78 static int try_cancel_split_timeout(struct fw_transaction *t)
80 if (t->is_split_transaction)
81 return del_timer(&t->split_timeout_timer);
86 static int close_transaction(struct fw_transaction *transaction,
87 struct fw_card *card, int rcode)
89 struct fw_transaction *t;
92 spin_lock_irqsave(&card->lock, flags);
93 list_for_each_entry(t, &card->transaction_list, link) {
94 if (t == transaction) {
95 if (!try_cancel_split_timeout(t)) {
96 spin_unlock_irqrestore(&card->lock, flags);
99 list_del_init(&t->link);
100 card->tlabel_mask &= ~(1ULL << t->tlabel);
104 spin_unlock_irqrestore(&card->lock, flags);
106 if (&t->link != &card->transaction_list) {
107 t->callback(card, rcode, NULL, 0, t->callback_data);
116 * Only valid for transactions that are potentially pending (ie have
119 int fw_cancel_transaction(struct fw_card *card,
120 struct fw_transaction *transaction)
123 * Cancel the packet transmission if it's still queued. That
124 * will call the packet transmission callback which cancels
128 if (card->driver->cancel_packet(card, &transaction->packet) == 0)
132 * If the request packet has already been sent, we need to see
133 * if the transaction is still pending and remove it in that case.
136 return close_transaction(transaction, card, RCODE_CANCELLED);
138 EXPORT_SYMBOL(fw_cancel_transaction);
140 static void split_transaction_timeout_callback(unsigned long data)
142 struct fw_transaction *t = (struct fw_transaction *)data;
143 struct fw_card *card = t->card;
146 spin_lock_irqsave(&card->lock, flags);
147 if (list_empty(&t->link)) {
148 spin_unlock_irqrestore(&card->lock, flags);
152 card->tlabel_mask &= ~(1ULL << t->tlabel);
153 spin_unlock_irqrestore(&card->lock, flags);
155 t->callback(card, RCODE_CANCELLED, NULL, 0, t->callback_data);
158 static void start_split_transaction_timeout(struct fw_transaction *t,
159 struct fw_card *card)
163 spin_lock_irqsave(&card->lock, flags);
165 if (list_empty(&t->link) || WARN_ON(t->is_split_transaction)) {
166 spin_unlock_irqrestore(&card->lock, flags);
170 t->is_split_transaction = true;
171 mod_timer(&t->split_timeout_timer,
172 jiffies + card->split_timeout_jiffies);
174 spin_unlock_irqrestore(&card->lock, flags);
177 static void transmit_complete_callback(struct fw_packet *packet,
178 struct fw_card *card, int status)
180 struct fw_transaction *t =
181 container_of(packet, struct fw_transaction, packet);
185 close_transaction(t, card, RCODE_COMPLETE);
188 start_split_transaction_timeout(t, card);
193 close_transaction(t, card, RCODE_BUSY);
196 close_transaction(t, card, RCODE_DATA_ERROR);
199 close_transaction(t, card, RCODE_TYPE_ERROR);
203 * In this case the ack is really a juju specific
204 * rcode, so just forward that to the callback.
206 close_transaction(t, card, status);
211 static void fw_fill_request(struct fw_packet *packet, int tcode, int tlabel,
212 int destination_id, int source_id, int generation, int speed,
213 unsigned long long offset, void *payload, size_t length)
217 if (tcode == TCODE_STREAM_DATA) {
219 HEADER_DATA_LENGTH(length) |
221 HEADER_TCODE(TCODE_STREAM_DATA);
222 packet->header_length = 4;
223 packet->payload = payload;
224 packet->payload_length = length;
230 ext_tcode = tcode & ~0x10;
231 tcode = TCODE_LOCK_REQUEST;
236 HEADER_RETRY(RETRY_X) |
237 HEADER_TLABEL(tlabel) |
238 HEADER_TCODE(tcode) |
239 HEADER_DESTINATION(destination_id);
241 HEADER_OFFSET_HIGH(offset >> 32) | HEADER_SOURCE(source_id);
246 case TCODE_WRITE_QUADLET_REQUEST:
247 packet->header[3] = *(u32 *)payload;
248 packet->header_length = 16;
249 packet->payload_length = 0;
252 case TCODE_LOCK_REQUEST:
253 case TCODE_WRITE_BLOCK_REQUEST:
255 HEADER_DATA_LENGTH(length) |
256 HEADER_EXTENDED_TCODE(ext_tcode);
257 packet->header_length = 16;
258 packet->payload = payload;
259 packet->payload_length = length;
262 case TCODE_READ_QUADLET_REQUEST:
263 packet->header_length = 12;
264 packet->payload_length = 0;
267 case TCODE_READ_BLOCK_REQUEST:
269 HEADER_DATA_LENGTH(length) |
270 HEADER_EXTENDED_TCODE(ext_tcode);
271 packet->header_length = 16;
272 packet->payload_length = 0;
276 WARN(1, "wrong tcode %d\n", tcode);
279 packet->speed = speed;
280 packet->generation = generation;
282 packet->payload_mapped = false;
285 static int allocate_tlabel(struct fw_card *card)
289 tlabel = card->current_tlabel;
290 while (card->tlabel_mask & (1ULL << tlabel)) {
291 tlabel = (tlabel + 1) & 0x3f;
292 if (tlabel == card->current_tlabel)
296 card->current_tlabel = (tlabel + 1) & 0x3f;
297 card->tlabel_mask |= 1ULL << tlabel;
303 * fw_send_request() - submit a request packet for transmission
304 * @card: interface to send the request at
305 * @t: transaction instance to which the request belongs
306 * @tcode: transaction code
307 * @destination_id: destination node ID, consisting of bus_ID and phy_ID
308 * @generation: bus generation in which request and response are valid
309 * @speed: transmission speed
310 * @offset: 48bit wide offset into destination's address space
311 * @payload: data payload for the request subaction
312 * @length: length of the payload, in bytes
313 * @callback: function to be called when the transaction is completed
314 * @callback_data: data to be passed to the transaction completion callback
316 * Submit a request packet into the asynchronous request transmission queue.
317 * Can be called from atomic context. If you prefer a blocking API, use
318 * fw_run_transaction() in a context that can sleep.
320 * In case of lock requests, specify one of the firewire-core specific %TCODE_
321 * constants instead of %TCODE_LOCK_REQUEST in @tcode.
323 * Make sure that the value in @destination_id is not older than the one in
324 * @generation. Otherwise the request is in danger to be sent to a wrong node.
326 * In case of asynchronous stream packets i.e. %TCODE_STREAM_DATA, the caller
327 * needs to synthesize @destination_id with fw_stream_packet_destination_id().
328 * It will contain tag, channel, and sy data instead of a node ID then.
330 * The payload buffer at @data is going to be DMA-mapped except in case of
331 * @length <= 8 or of local (loopback) requests. Hence make sure that the
332 * buffer complies with the restrictions of the streaming DMA mapping API.
333 * @payload must not be freed before the @callback is called.
335 * In case of request types without payload, @data is NULL and @length is 0.
337 * After the transaction is completed successfully or unsuccessfully, the
338 * @callback will be called. Among its parameters is the response code which
339 * is either one of the rcodes per IEEE 1394 or, in case of internal errors,
340 * the firewire-core specific %RCODE_SEND_ERROR. The other firewire-core
341 * specific rcodes (%RCODE_CANCELLED, %RCODE_BUSY, %RCODE_GENERATION,
342 * %RCODE_NO_ACK) denote transaction timeout, busy responder, stale request
343 * generation, or missing ACK respectively.
345 * Note some timing corner cases: fw_send_request() may complete much earlier
346 * than when the request packet actually hits the wire. On the other hand,
347 * transaction completion and hence execution of @callback may happen even
348 * before fw_send_request() returns.
350 void fw_send_request(struct fw_card *card, struct fw_transaction *t, int tcode,
351 int destination_id, int generation, int speed,
352 unsigned long long offset, void *payload, size_t length,
353 fw_transaction_callback_t callback, void *callback_data)
359 * Allocate tlabel from the bitmap and put the transaction on
360 * the list while holding the card spinlock.
363 spin_lock_irqsave(&card->lock, flags);
365 tlabel = allocate_tlabel(card);
367 spin_unlock_irqrestore(&card->lock, flags);
368 callback(card, RCODE_SEND_ERROR, NULL, 0, callback_data);
372 t->node_id = destination_id;
375 t->is_split_transaction = false;
376 setup_timer(&t->split_timeout_timer,
377 split_transaction_timeout_callback, (unsigned long)t);
378 t->callback = callback;
379 t->callback_data = callback_data;
381 fw_fill_request(&t->packet, tcode, t->tlabel,
382 destination_id, card->node_id, generation,
383 speed, offset, payload, length);
384 t->packet.callback = transmit_complete_callback;
386 list_add_tail(&t->link, &card->transaction_list);
388 spin_unlock_irqrestore(&card->lock, flags);
390 card->driver->send_request(card, &t->packet);
392 EXPORT_SYMBOL(fw_send_request);
394 struct transaction_callback_data {
395 struct completion done;
400 static void transaction_callback(struct fw_card *card, int rcode,
401 void *payload, size_t length, void *data)
403 struct transaction_callback_data *d = data;
405 if (rcode == RCODE_COMPLETE)
406 memcpy(d->payload, payload, length);
412 * fw_run_transaction() - send request and sleep until transaction is completed
414 * Returns the RCODE. See fw_send_request() for parameter documentation.
415 * Unlike fw_send_request(), @data points to the payload of the request or/and
416 * to the payload of the response. DMA mapping restrictions apply to outbound
417 * request payloads of >= 8 bytes but not to inbound response payloads.
419 int fw_run_transaction(struct fw_card *card, int tcode, int destination_id,
420 int generation, int speed, unsigned long long offset,
421 void *payload, size_t length)
423 struct transaction_callback_data d;
424 struct fw_transaction t;
426 init_timer_on_stack(&t.split_timeout_timer);
427 init_completion(&d.done);
429 fw_send_request(card, &t, tcode, destination_id, generation, speed,
430 offset, payload, length, transaction_callback, &d);
431 wait_for_completion(&d.done);
432 destroy_timer_on_stack(&t.split_timeout_timer);
436 EXPORT_SYMBOL(fw_run_transaction);
438 static DEFINE_MUTEX(phy_config_mutex);
439 static DECLARE_COMPLETION(phy_config_done);
441 static void transmit_phy_packet_callback(struct fw_packet *packet,
442 struct fw_card *card, int status)
444 complete(&phy_config_done);
447 static struct fw_packet phy_config_packet = {
449 .header[0] = TCODE_LINK_INTERNAL << 4,
452 .callback = transmit_phy_packet_callback,
455 void fw_send_phy_config(struct fw_card *card,
456 int node_id, int generation, int gap_count)
458 long timeout = DIV_ROUND_UP(HZ, 10);
459 u32 data = PHY_IDENTIFIER(PHY_PACKET_CONFIG);
461 if (node_id != FW_PHY_CONFIG_NO_NODE_ID)
462 data |= PHY_CONFIG_ROOT_ID(node_id);
464 if (gap_count == FW_PHY_CONFIG_CURRENT_GAP_COUNT) {
465 gap_count = card->driver->read_phy_reg(card, 1);
473 data |= PHY_CONFIG_GAP_COUNT(gap_count);
475 mutex_lock(&phy_config_mutex);
477 phy_config_packet.header[1] = data;
478 phy_config_packet.header[2] = ~data;
479 phy_config_packet.generation = generation;
480 INIT_COMPLETION(phy_config_done);
482 card->driver->send_request(card, &phy_config_packet);
483 wait_for_completion_timeout(&phy_config_done, timeout);
485 mutex_unlock(&phy_config_mutex);
488 static struct fw_address_handler *lookup_overlapping_address_handler(
489 struct list_head *list, unsigned long long offset, size_t length)
491 struct fw_address_handler *handler;
493 list_for_each_entry_rcu(handler, list, link) {
494 if (handler->offset < offset + length &&
495 offset < handler->offset + handler->length)
502 static bool is_enclosing_handler(struct fw_address_handler *handler,
503 unsigned long long offset, size_t length)
505 return handler->offset <= offset &&
506 offset + length <= handler->offset + handler->length;
509 static struct fw_address_handler *lookup_enclosing_address_handler(
510 struct list_head *list, unsigned long long offset, size_t length)
512 struct fw_address_handler *handler;
514 list_for_each_entry_rcu(handler, list, link) {
515 if (is_enclosing_handler(handler, offset, length))
522 static DEFINE_SPINLOCK(address_handler_lock);
523 static LIST_HEAD(address_handler_list);
525 const struct fw_address_region fw_high_memory_region =
526 { .start = 0x000100000000ULL, .end = 0xffffe0000000ULL, };
527 EXPORT_SYMBOL(fw_high_memory_region);
529 static const struct fw_address_region low_memory_region =
530 { .start = 0x000000000000ULL, .end = 0x000100000000ULL, };
533 const struct fw_address_region fw_private_region =
534 { .start = 0xffffe0000000ULL, .end = 0xfffff0000000ULL, };
535 const struct fw_address_region fw_csr_region =
536 { .start = CSR_REGISTER_BASE,
537 .end = CSR_REGISTER_BASE | CSR_CONFIG_ROM_END, };
538 const struct fw_address_region fw_unit_space_region =
539 { .start = 0xfffff0000900ULL, .end = 0x1000000000000ULL, };
542 static bool is_in_fcp_region(u64 offset, size_t length)
544 return offset >= (CSR_REGISTER_BASE | CSR_FCP_COMMAND) &&
545 offset + length <= (CSR_REGISTER_BASE | CSR_FCP_END);
549 * fw_core_add_address_handler() - register for incoming requests
551 * @region: region in the IEEE 1212 node space address range
553 * region->start, ->end, and handler->length have to be quadlet-aligned.
555 * When a request is received that falls within the specified address range,
556 * the specified callback is invoked. The parameters passed to the callback
557 * give the details of the particular request.
559 * Return value: 0 on success, non-zero otherwise.
561 * The start offset of the handler's address region is determined by
562 * fw_core_add_address_handler() and is returned in handler->offset.
564 * Address allocations are exclusive, except for the FCP registers.
566 int fw_core_add_address_handler(struct fw_address_handler *handler,
567 const struct fw_address_region *region)
569 struct fw_address_handler *other;
572 if (region->start & 0xffff000000000003ULL ||
573 region->start >= region->end ||
574 region->end > 0x0001000000000000ULL ||
575 handler->length & 3 ||
576 handler->length == 0)
579 spin_lock_bh(&address_handler_lock);
581 handler->offset = region->start;
582 while (handler->offset + handler->length <= region->end) {
583 if (is_in_fcp_region(handler->offset, handler->length))
586 other = lookup_overlapping_address_handler
587 (&address_handler_list,
588 handler->offset, handler->length);
590 handler->offset += other->length;
592 list_add_tail_rcu(&handler->link, &address_handler_list);
598 spin_unlock_bh(&address_handler_lock);
602 EXPORT_SYMBOL(fw_core_add_address_handler);
605 * fw_core_remove_address_handler() - unregister an address handler
607 * When fw_core_remove_address_handler() returns, @handler->callback() is
608 * guaranteed to not run on any CPU anymore.
610 void fw_core_remove_address_handler(struct fw_address_handler *handler)
612 spin_lock_bh(&address_handler_lock);
613 list_del_rcu(&handler->link);
614 spin_unlock_bh(&address_handler_lock);
617 EXPORT_SYMBOL(fw_core_remove_address_handler);
620 struct fw_packet response;
621 u32 request_header[4];
627 static void free_response_callback(struct fw_packet *packet,
628 struct fw_card *card, int status)
630 struct fw_request *request;
632 request = container_of(packet, struct fw_request, response);
636 int fw_get_response_length(struct fw_request *r)
638 int tcode, ext_tcode, data_length;
640 tcode = HEADER_GET_TCODE(r->request_header[0]);
643 case TCODE_WRITE_QUADLET_REQUEST:
644 case TCODE_WRITE_BLOCK_REQUEST:
647 case TCODE_READ_QUADLET_REQUEST:
650 case TCODE_READ_BLOCK_REQUEST:
651 data_length = HEADER_GET_DATA_LENGTH(r->request_header[3]);
654 case TCODE_LOCK_REQUEST:
655 ext_tcode = HEADER_GET_EXTENDED_TCODE(r->request_header[3]);
656 data_length = HEADER_GET_DATA_LENGTH(r->request_header[3]);
658 case EXTCODE_FETCH_ADD:
659 case EXTCODE_LITTLE_ADD:
662 return data_length / 2;
666 WARN(1, "wrong tcode %d\n", tcode);
671 void fw_fill_response(struct fw_packet *response, u32 *request_header,
672 int rcode, void *payload, size_t length)
674 int tcode, tlabel, extended_tcode, source, destination;
676 tcode = HEADER_GET_TCODE(request_header[0]);
677 tlabel = HEADER_GET_TLABEL(request_header[0]);
678 source = HEADER_GET_DESTINATION(request_header[0]);
679 destination = HEADER_GET_SOURCE(request_header[1]);
680 extended_tcode = HEADER_GET_EXTENDED_TCODE(request_header[3]);
682 response->header[0] =
683 HEADER_RETRY(RETRY_1) |
684 HEADER_TLABEL(tlabel) |
685 HEADER_DESTINATION(destination);
686 response->header[1] =
687 HEADER_SOURCE(source) |
689 response->header[2] = 0;
692 case TCODE_WRITE_QUADLET_REQUEST:
693 case TCODE_WRITE_BLOCK_REQUEST:
694 response->header[0] |= HEADER_TCODE(TCODE_WRITE_RESPONSE);
695 response->header_length = 12;
696 response->payload_length = 0;
699 case TCODE_READ_QUADLET_REQUEST:
700 response->header[0] |=
701 HEADER_TCODE(TCODE_READ_QUADLET_RESPONSE);
703 response->header[3] = *(u32 *)payload;
705 response->header[3] = 0;
706 response->header_length = 16;
707 response->payload_length = 0;
710 case TCODE_READ_BLOCK_REQUEST:
711 case TCODE_LOCK_REQUEST:
712 response->header[0] |= HEADER_TCODE(tcode + 2);
713 response->header[3] =
714 HEADER_DATA_LENGTH(length) |
715 HEADER_EXTENDED_TCODE(extended_tcode);
716 response->header_length = 16;
717 response->payload = payload;
718 response->payload_length = length;
722 WARN(1, "wrong tcode %d\n", tcode);
725 response->payload_mapped = false;
727 EXPORT_SYMBOL(fw_fill_response);
729 static u32 compute_split_timeout_timestamp(struct fw_card *card,
730 u32 request_timestamp)
735 cycles = card->split_timeout_cycles;
736 cycles += request_timestamp & 0x1fff;
738 timestamp = request_timestamp & ~0x1fff;
739 timestamp += (cycles / 8000) << 13;
740 timestamp |= cycles % 8000;
745 static struct fw_request *allocate_request(struct fw_card *card,
748 struct fw_request *request;
752 request_tcode = HEADER_GET_TCODE(p->header[0]);
753 switch (request_tcode) {
754 case TCODE_WRITE_QUADLET_REQUEST:
755 data = &p->header[3];
759 case TCODE_WRITE_BLOCK_REQUEST:
760 case TCODE_LOCK_REQUEST:
762 length = HEADER_GET_DATA_LENGTH(p->header[3]);
765 case TCODE_READ_QUADLET_REQUEST:
770 case TCODE_READ_BLOCK_REQUEST:
772 length = HEADER_GET_DATA_LENGTH(p->header[3]);
776 fw_notice(card, "ERROR - corrupt request received - %08x %08x %08x\n",
777 p->header[0], p->header[1], p->header[2]);
781 request = kmalloc(sizeof(*request) + length, GFP_ATOMIC);
785 request->response.speed = p->speed;
786 request->response.timestamp =
787 compute_split_timeout_timestamp(card, p->timestamp);
788 request->response.generation = p->generation;
789 request->response.ack = 0;
790 request->response.callback = free_response_callback;
791 request->ack = p->ack;
792 request->length = length;
794 memcpy(request->data, data, length);
796 memcpy(request->request_header, p->header, sizeof(p->header));
801 void fw_send_response(struct fw_card *card,
802 struct fw_request *request, int rcode)
804 if (WARN_ONCE(!request, "invalid for FCP address handlers"))
807 /* unified transaction or broadcast transaction: don't respond */
808 if (request->ack != ACK_PENDING ||
809 HEADER_DESTINATION_IS_BROADCAST(request->request_header[0])) {
814 if (rcode == RCODE_COMPLETE)
815 fw_fill_response(&request->response, request->request_header,
816 rcode, request->data,
817 fw_get_response_length(request));
819 fw_fill_response(&request->response, request->request_header,
822 card->driver->send_response(card, &request->response);
824 EXPORT_SYMBOL(fw_send_response);
827 * fw_get_request_speed() - returns speed at which the @request was received
829 int fw_get_request_speed(struct fw_request *request)
831 return request->response.speed;
833 EXPORT_SYMBOL(fw_get_request_speed);
835 static void handle_exclusive_region_request(struct fw_card *card,
837 struct fw_request *request,
838 unsigned long long offset)
840 struct fw_address_handler *handler;
841 int tcode, destination, source;
843 destination = HEADER_GET_DESTINATION(p->header[0]);
844 source = HEADER_GET_SOURCE(p->header[1]);
845 tcode = HEADER_GET_TCODE(p->header[0]);
846 if (tcode == TCODE_LOCK_REQUEST)
847 tcode = 0x10 + HEADER_GET_EXTENDED_TCODE(p->header[3]);
850 handler = lookup_enclosing_address_handler(&address_handler_list,
851 offset, request->length);
853 handler->address_callback(card, request,
854 tcode, destination, source,
855 p->generation, offset,
856 request->data, request->length,
857 handler->callback_data);
861 fw_send_response(card, request, RCODE_ADDRESS_ERROR);
864 static void handle_fcp_region_request(struct fw_card *card,
866 struct fw_request *request,
867 unsigned long long offset)
869 struct fw_address_handler *handler;
870 int tcode, destination, source;
872 if ((offset != (CSR_REGISTER_BASE | CSR_FCP_COMMAND) &&
873 offset != (CSR_REGISTER_BASE | CSR_FCP_RESPONSE)) ||
874 request->length > 0x200) {
875 fw_send_response(card, request, RCODE_ADDRESS_ERROR);
880 tcode = HEADER_GET_TCODE(p->header[0]);
881 destination = HEADER_GET_DESTINATION(p->header[0]);
882 source = HEADER_GET_SOURCE(p->header[1]);
884 if (tcode != TCODE_WRITE_QUADLET_REQUEST &&
885 tcode != TCODE_WRITE_BLOCK_REQUEST) {
886 fw_send_response(card, request, RCODE_TYPE_ERROR);
892 list_for_each_entry_rcu(handler, &address_handler_list, link) {
893 if (is_enclosing_handler(handler, offset, request->length))
894 handler->address_callback(card, NULL, tcode,
896 p->generation, offset,
899 handler->callback_data);
903 fw_send_response(card, request, RCODE_COMPLETE);
906 void fw_core_handle_request(struct fw_card *card, struct fw_packet *p)
908 struct fw_request *request;
909 unsigned long long offset;
911 if (p->ack != ACK_PENDING && p->ack != ACK_COMPLETE)
914 if (TCODE_IS_LINK_INTERNAL(HEADER_GET_TCODE(p->header[0]))) {
915 fw_cdev_handle_phy_packet(card, p);
919 request = allocate_request(card, p);
920 if (request == NULL) {
921 /* FIXME: send statically allocated busy packet. */
925 offset = ((u64)HEADER_GET_OFFSET_HIGH(p->header[1]) << 32) |
928 if (!is_in_fcp_region(offset, request->length))
929 handle_exclusive_region_request(card, p, request, offset);
931 handle_fcp_region_request(card, p, request, offset);
934 EXPORT_SYMBOL(fw_core_handle_request);
936 void fw_core_handle_response(struct fw_card *card, struct fw_packet *p)
938 struct fw_transaction *t;
942 int tcode, tlabel, source, rcode;
944 tcode = HEADER_GET_TCODE(p->header[0]);
945 tlabel = HEADER_GET_TLABEL(p->header[0]);
946 source = HEADER_GET_SOURCE(p->header[1]);
947 rcode = HEADER_GET_RCODE(p->header[1]);
949 spin_lock_irqsave(&card->lock, flags);
950 list_for_each_entry(t, &card->transaction_list, link) {
951 if (t->node_id == source && t->tlabel == tlabel) {
952 if (!try_cancel_split_timeout(t)) {
953 spin_unlock_irqrestore(&card->lock, flags);
956 list_del_init(&t->link);
957 card->tlabel_mask &= ~(1ULL << t->tlabel);
961 spin_unlock_irqrestore(&card->lock, flags);
963 if (&t->link == &card->transaction_list) {
965 fw_notice(card, "unsolicited response (source %x, tlabel %x)\n",
971 * FIXME: sanity check packet, is length correct, does tcodes
972 * and addresses match.
976 case TCODE_READ_QUADLET_RESPONSE:
977 data = (u32 *) &p->header[3];
981 case TCODE_WRITE_RESPONSE:
986 case TCODE_READ_BLOCK_RESPONSE:
987 case TCODE_LOCK_RESPONSE:
989 data_length = HEADER_GET_DATA_LENGTH(p->header[3]);
993 /* Should never happen, this is just to shut up gcc. */
1000 * The response handler may be executed while the request handler
1001 * is still pending. Cancel the request handler.
1003 card->driver->cancel_packet(card, &t->packet);
1005 t->callback(card, rcode, data, data_length, t->callback_data);
1007 EXPORT_SYMBOL(fw_core_handle_response);
1010 * fw_rcode_string - convert a firewire result code to an error description
1011 * @rcode: the result code
1013 const char *fw_rcode_string(int rcode)
1015 static const char *const names[] = {
1016 [RCODE_COMPLETE] = "no error",
1017 [RCODE_CONFLICT_ERROR] = "conflict error",
1018 [RCODE_DATA_ERROR] = "data error",
1019 [RCODE_TYPE_ERROR] = "type error",
1020 [RCODE_ADDRESS_ERROR] = "address error",
1021 [RCODE_SEND_ERROR] = "send error",
1022 [RCODE_CANCELLED] = "timeout",
1023 [RCODE_BUSY] = "busy",
1024 [RCODE_GENERATION] = "bus reset",
1025 [RCODE_NO_ACK] = "no ack",
1028 if ((unsigned int)rcode < ARRAY_SIZE(names) && names[rcode])
1029 return names[rcode];
1033 EXPORT_SYMBOL(fw_rcode_string);
1035 static const struct fw_address_region topology_map_region =
1036 { .start = CSR_REGISTER_BASE | CSR_TOPOLOGY_MAP,
1037 .end = CSR_REGISTER_BASE | CSR_TOPOLOGY_MAP_END, };
1039 static void handle_topology_map(struct fw_card *card, struct fw_request *request,
1040 int tcode, int destination, int source, int generation,
1041 unsigned long long offset, void *payload, size_t length,
1042 void *callback_data)
1046 if (!TCODE_IS_READ_REQUEST(tcode)) {
1047 fw_send_response(card, request, RCODE_TYPE_ERROR);
1051 if ((offset & 3) > 0 || (length & 3) > 0) {
1052 fw_send_response(card, request, RCODE_ADDRESS_ERROR);
1056 start = (offset - topology_map_region.start) / 4;
1057 memcpy(payload, &card->topology_map[start], length);
1059 fw_send_response(card, request, RCODE_COMPLETE);
1062 static struct fw_address_handler topology_map = {
1064 .address_callback = handle_topology_map,
1067 static const struct fw_address_region registers_region =
1068 { .start = CSR_REGISTER_BASE,
1069 .end = CSR_REGISTER_BASE | CSR_CONFIG_ROM, };
1071 static void update_split_timeout(struct fw_card *card)
1073 unsigned int cycles;
1075 cycles = card->split_timeout_hi * 8000 + (card->split_timeout_lo >> 19);
1077 /* minimum per IEEE 1394, maximum which doesn't overflow OHCI */
1078 cycles = clamp(cycles, 800u, 3u * 8000u);
1080 card->split_timeout_cycles = cycles;
1081 card->split_timeout_jiffies = DIV_ROUND_UP(cycles * HZ, 8000);
1084 static void handle_registers(struct fw_card *card, struct fw_request *request,
1085 int tcode, int destination, int source, int generation,
1086 unsigned long long offset, void *payload, size_t length,
1087 void *callback_data)
1089 int reg = offset & ~CSR_REGISTER_BASE;
1090 __be32 *data = payload;
1091 int rcode = RCODE_COMPLETE;
1092 unsigned long flags;
1095 case CSR_PRIORITY_BUDGET:
1096 if (!card->priority_budget_implemented) {
1097 rcode = RCODE_ADDRESS_ERROR;
1100 /* else fall through */
1104 * per IEEE 1394-2008 8.3.22.3, not IEEE 1394.1-2004 3.2.8
1105 * and 9.6, but interoperable with IEEE 1394.1-2004 bridges
1109 case CSR_STATE_CLEAR:
1111 case CSR_CYCLE_TIME:
1113 case CSR_BUSY_TIMEOUT:
1114 if (tcode == TCODE_READ_QUADLET_REQUEST)
1115 *data = cpu_to_be32(card->driver->read_csr(card, reg));
1116 else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
1117 card->driver->write_csr(card, reg, be32_to_cpu(*data));
1119 rcode = RCODE_TYPE_ERROR;
1122 case CSR_RESET_START:
1123 if (tcode == TCODE_WRITE_QUADLET_REQUEST)
1124 card->driver->write_csr(card, CSR_STATE_CLEAR,
1125 CSR_STATE_BIT_ABDICATE);
1127 rcode = RCODE_TYPE_ERROR;
1130 case CSR_SPLIT_TIMEOUT_HI:
1131 if (tcode == TCODE_READ_QUADLET_REQUEST) {
1132 *data = cpu_to_be32(card->split_timeout_hi);
1133 } else if (tcode == TCODE_WRITE_QUADLET_REQUEST) {
1134 spin_lock_irqsave(&card->lock, flags);
1135 card->split_timeout_hi = be32_to_cpu(*data) & 7;
1136 update_split_timeout(card);
1137 spin_unlock_irqrestore(&card->lock, flags);
1139 rcode = RCODE_TYPE_ERROR;
1143 case CSR_SPLIT_TIMEOUT_LO:
1144 if (tcode == TCODE_READ_QUADLET_REQUEST) {
1145 *data = cpu_to_be32(card->split_timeout_lo);
1146 } else if (tcode == TCODE_WRITE_QUADLET_REQUEST) {
1147 spin_lock_irqsave(&card->lock, flags);
1148 card->split_timeout_lo =
1149 be32_to_cpu(*data) & 0xfff80000;
1150 update_split_timeout(card);
1151 spin_unlock_irqrestore(&card->lock, flags);
1153 rcode = RCODE_TYPE_ERROR;
1157 case CSR_MAINT_UTILITY:
1158 if (tcode == TCODE_READ_QUADLET_REQUEST)
1159 *data = card->maint_utility_register;
1160 else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
1161 card->maint_utility_register = *data;
1163 rcode = RCODE_TYPE_ERROR;
1166 case CSR_BROADCAST_CHANNEL:
1167 if (tcode == TCODE_READ_QUADLET_REQUEST)
1168 *data = cpu_to_be32(card->broadcast_channel);
1169 else if (tcode == TCODE_WRITE_QUADLET_REQUEST)
1170 card->broadcast_channel =
1171 (be32_to_cpu(*data) & BROADCAST_CHANNEL_VALID) |
1172 BROADCAST_CHANNEL_INITIAL;
1174 rcode = RCODE_TYPE_ERROR;
1177 case CSR_BUS_MANAGER_ID:
1178 case CSR_BANDWIDTH_AVAILABLE:
1179 case CSR_CHANNELS_AVAILABLE_HI:
1180 case CSR_CHANNELS_AVAILABLE_LO:
1182 * FIXME: these are handled by the OHCI hardware and
1183 * the stack never sees these request. If we add
1184 * support for a new type of controller that doesn't
1185 * handle this in hardware we need to deal with these
1192 rcode = RCODE_ADDRESS_ERROR;
1196 fw_send_response(card, request, rcode);
1199 static struct fw_address_handler registers = {
1201 .address_callback = handle_registers,
1204 static void handle_low_memory(struct fw_card *card, struct fw_request *request,
1205 int tcode, int destination, int source, int generation,
1206 unsigned long long offset, void *payload, size_t length,
1207 void *callback_data)
1210 * This catches requests not handled by the physical DMA unit,
1211 * i.e., wrong transaction types or unauthorized source nodes.
1213 fw_send_response(card, request, RCODE_TYPE_ERROR);
1216 static struct fw_address_handler low_memory = {
1217 .length = 0x000100000000ULL,
1218 .address_callback = handle_low_memory,
1221 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
1222 MODULE_DESCRIPTION("Core IEEE1394 transaction logic");
1223 MODULE_LICENSE("GPL");
1225 static const u32 vendor_textual_descriptor[] = {
1226 /* textual descriptor leaf () */
1230 0x4c696e75, /* L i n u */
1231 0x78204669, /* x F i */
1232 0x72657769, /* r e w i */
1233 0x72650000, /* r e */
1236 static const u32 model_textual_descriptor[] = {
1237 /* model descriptor leaf () */
1241 0x4a756a75, /* J u j u */
1244 static struct fw_descriptor vendor_id_descriptor = {
1245 .length = ARRAY_SIZE(vendor_textual_descriptor),
1246 .immediate = 0x03d00d1e,
1248 .data = vendor_textual_descriptor,
1251 static struct fw_descriptor model_id_descriptor = {
1252 .length = ARRAY_SIZE(model_textual_descriptor),
1253 .immediate = 0x17000001,
1255 .data = model_textual_descriptor,
1258 static int __init fw_core_init(void)
1262 fw_workqueue = alloc_workqueue("firewire",
1263 WQ_NON_REENTRANT | WQ_MEM_RECLAIM, 0);
1267 ret = bus_register(&fw_bus_type);
1269 destroy_workqueue(fw_workqueue);
1273 fw_cdev_major = register_chrdev(0, "firewire", &fw_device_ops);
1274 if (fw_cdev_major < 0) {
1275 bus_unregister(&fw_bus_type);
1276 destroy_workqueue(fw_workqueue);
1277 return fw_cdev_major;
1280 fw_core_add_address_handler(&topology_map, &topology_map_region);
1281 fw_core_add_address_handler(®isters, ®isters_region);
1282 fw_core_add_address_handler(&low_memory, &low_memory_region);
1283 fw_core_add_descriptor(&vendor_id_descriptor);
1284 fw_core_add_descriptor(&model_id_descriptor);
1289 static void __exit fw_core_cleanup(void)
1291 unregister_chrdev(fw_cdev_major, "firewire");
1292 bus_unregister(&fw_bus_type);
1293 destroy_workqueue(fw_workqueue);
1294 idr_destroy(&fw_device_idr);
1297 module_init(fw_core_init);
1298 module_exit(fw_core_cleanup);