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Commit | Line | Data |
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c781c06d KH |
1 | /* |
2 | * Core IEEE1394 transaction logic | |
3038e353 KH |
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 | ||
2a0a2590 | 21 | #include <linux/completion.h> |
3038e353 | 22 | #include <linux/kernel.h> |
ae1e5355 | 23 | #include <linux/kref.h> |
3038e353 | 24 | #include <linux/module.h> |
c0220d68 | 25 | #include <linux/mutex.h> |
3038e353 KH |
26 | #include <linux/init.h> |
27 | #include <linux/interrupt.h> | |
28 | #include <linux/pci.h> | |
29 | #include <linux/delay.h> | |
30 | #include <linux/poll.h> | |
31 | #include <linux/list.h> | |
32 | #include <linux/kthread.h> | |
33 | #include <asm/uaccess.h> | |
3038e353 KH |
34 | |
35 | #include "fw-transaction.h" | |
36 | #include "fw-topology.h" | |
19a15b93 | 37 | #include "fw-device.h" |
3038e353 | 38 | |
a77754a7 KH |
39 | #define HEADER_PRI(pri) ((pri) << 0) |
40 | #define HEADER_TCODE(tcode) ((tcode) << 4) | |
41 | #define HEADER_RETRY(retry) ((retry) << 8) | |
42 | #define HEADER_TLABEL(tlabel) ((tlabel) << 10) | |
43 | #define HEADER_DESTINATION(destination) ((destination) << 16) | |
44 | #define HEADER_SOURCE(source) ((source) << 16) | |
45 | #define HEADER_RCODE(rcode) ((rcode) << 12) | |
46 | #define HEADER_OFFSET_HIGH(offset_high) ((offset_high) << 0) | |
47 | #define HEADER_DATA_LENGTH(length) ((length) << 16) | |
48 | #define HEADER_EXTENDED_TCODE(tcode) ((tcode) << 0) | |
49 | ||
50 | #define HEADER_GET_TCODE(q) (((q) >> 4) & 0x0f) | |
51 | #define HEADER_GET_TLABEL(q) (((q) >> 10) & 0x3f) | |
52 | #define HEADER_GET_RCODE(q) (((q) >> 12) & 0x0f) | |
53 | #define HEADER_GET_DESTINATION(q) (((q) >> 16) & 0xffff) | |
54 | #define HEADER_GET_SOURCE(q) (((q) >> 16) & 0xffff) | |
55 | #define HEADER_GET_OFFSET_HIGH(q) (((q) >> 0) & 0xffff) | |
56 | #define HEADER_GET_DATA_LENGTH(q) (((q) >> 16) & 0xffff) | |
57 | #define HEADER_GET_EXTENDED_TCODE(q) (((q) >> 0) & 0xffff) | |
58 | ||
a7ea6782 SR |
59 | #define HEADER_DESTINATION_IS_BROADCAST(q) \ |
60 | (((q) & HEADER_DESTINATION(0x3f)) == HEADER_DESTINATION(0x3f)) | |
61 | ||
a77754a7 KH |
62 | #define PHY_CONFIG_GAP_COUNT(gap_count) (((gap_count) << 16) | (1 << 22)) |
63 | #define PHY_CONFIG_ROOT_ID(node_id) ((((node_id) & 0x3f) << 24) | (1 << 23)) | |
64 | #define PHY_IDENTIFIER(id) ((id) << 30) | |
3038e353 | 65 | |
730c32f5 KH |
66 | static int |
67 | close_transaction(struct fw_transaction *transaction, | |
68 | struct fw_card *card, int rcode, | |
69 | u32 *payload, size_t length) | |
3038e353 | 70 | { |
730c32f5 | 71 | struct fw_transaction *t; |
3038e353 KH |
72 | unsigned long flags; |
73 | ||
74 | spin_lock_irqsave(&card->lock, flags); | |
730c32f5 KH |
75 | list_for_each_entry(t, &card->transaction_list, link) { |
76 | if (t == transaction) { | |
77 | list_del(&t->link); | |
78 | card->tlabel_mask &= ~(1 << t->tlabel); | |
79 | break; | |
80 | } | |
81 | } | |
3038e353 KH |
82 | spin_unlock_irqrestore(&card->lock, flags); |
83 | ||
730c32f5 KH |
84 | if (&t->link != &card->transaction_list) { |
85 | t->callback(card, rcode, payload, length, t->callback_data); | |
86 | return 0; | |
87 | } | |
88 | ||
89 | return -ENOENT; | |
3038e353 KH |
90 | } |
91 | ||
c781c06d KH |
92 | /* |
93 | * Only valid for transactions that are potentially pending (ie have | |
94 | * been sent). | |
95 | */ | |
730c32f5 KH |
96 | int |
97 | fw_cancel_transaction(struct fw_card *card, | |
98 | struct fw_transaction *transaction) | |
99 | { | |
c781c06d KH |
100 | /* |
101 | * Cancel the packet transmission if it's still queued. That | |
730c32f5 | 102 | * will call the packet transmission callback which cancels |
c781c06d KH |
103 | * the transaction. |
104 | */ | |
730c32f5 KH |
105 | |
106 | if (card->driver->cancel_packet(card, &transaction->packet) == 0) | |
107 | return 0; | |
108 | ||
c781c06d KH |
109 | /* |
110 | * If the request packet has already been sent, we need to see | |
111 | * if the transaction is still pending and remove it in that case. | |
112 | */ | |
730c32f5 KH |
113 | |
114 | return close_transaction(transaction, card, RCODE_CANCELLED, NULL, 0); | |
115 | } | |
116 | EXPORT_SYMBOL(fw_cancel_transaction); | |
117 | ||
3038e353 KH |
118 | static void |
119 | transmit_complete_callback(struct fw_packet *packet, | |
120 | struct fw_card *card, int status) | |
121 | { | |
122 | struct fw_transaction *t = | |
123 | container_of(packet, struct fw_transaction, packet); | |
124 | ||
125 | switch (status) { | |
126 | case ACK_COMPLETE: | |
127 | close_transaction(t, card, RCODE_COMPLETE, NULL, 0); | |
128 | break; | |
129 | case ACK_PENDING: | |
130 | t->timestamp = packet->timestamp; | |
131 | break; | |
132 | case ACK_BUSY_X: | |
133 | case ACK_BUSY_A: | |
134 | case ACK_BUSY_B: | |
135 | close_transaction(t, card, RCODE_BUSY, NULL, 0); | |
136 | break; | |
137 | case ACK_DATA_ERROR: | |
e5f49c3b KH |
138 | close_transaction(t, card, RCODE_DATA_ERROR, NULL, 0); |
139 | break; | |
3038e353 | 140 | case ACK_TYPE_ERROR: |
e5f49c3b | 141 | close_transaction(t, card, RCODE_TYPE_ERROR, NULL, 0); |
3038e353 KH |
142 | break; |
143 | default: | |
c781c06d KH |
144 | /* |
145 | * In this case the ack is really a juju specific | |
146 | * rcode, so just forward that to the callback. | |
147 | */ | |
e5f49c3b | 148 | close_transaction(t, card, status, NULL, 0); |
3038e353 KH |
149 | break; |
150 | } | |
151 | } | |
152 | ||
95688e97 | 153 | static void |
36bfe49d | 154 | fw_fill_request(struct fw_packet *packet, int tcode, int tlabel, |
b9549bc6 | 155 | int destination_id, int source_id, int generation, int speed, |
36bfe49d | 156 | unsigned long long offset, void *payload, size_t length) |
3038e353 KH |
157 | { |
158 | int ext_tcode; | |
159 | ||
160 | if (tcode > 0x10) { | |
8f9f963e | 161 | ext_tcode = tcode & ~0x10; |
3038e353 KH |
162 | tcode = TCODE_LOCK_REQUEST; |
163 | } else | |
164 | ext_tcode = 0; | |
165 | ||
166 | packet->header[0] = | |
a77754a7 KH |
167 | HEADER_RETRY(RETRY_X) | |
168 | HEADER_TLABEL(tlabel) | | |
169 | HEADER_TCODE(tcode) | | |
b9549bc6 | 170 | HEADER_DESTINATION(destination_id); |
3038e353 | 171 | packet->header[1] = |
a77754a7 | 172 | HEADER_OFFSET_HIGH(offset >> 32) | HEADER_SOURCE(source_id); |
3038e353 KH |
173 | packet->header[2] = |
174 | offset; | |
175 | ||
176 | switch (tcode) { | |
177 | case TCODE_WRITE_QUADLET_REQUEST: | |
178 | packet->header[3] = *(u32 *)payload; | |
179 | packet->header_length = 16; | |
180 | packet->payload_length = 0; | |
181 | break; | |
182 | ||
183 | case TCODE_LOCK_REQUEST: | |
184 | case TCODE_WRITE_BLOCK_REQUEST: | |
185 | packet->header[3] = | |
a77754a7 KH |
186 | HEADER_DATA_LENGTH(length) | |
187 | HEADER_EXTENDED_TCODE(ext_tcode); | |
3038e353 KH |
188 | packet->header_length = 16; |
189 | packet->payload = payload; | |
190 | packet->payload_length = length; | |
191 | break; | |
192 | ||
193 | case TCODE_READ_QUADLET_REQUEST: | |
194 | packet->header_length = 12; | |
195 | packet->payload_length = 0; | |
196 | break; | |
197 | ||
198 | case TCODE_READ_BLOCK_REQUEST: | |
199 | packet->header[3] = | |
a77754a7 KH |
200 | HEADER_DATA_LENGTH(length) | |
201 | HEADER_EXTENDED_TCODE(ext_tcode); | |
3038e353 KH |
202 | packet->header_length = 16; |
203 | packet->payload_length = 0; | |
204 | break; | |
205 | } | |
206 | ||
207 | packet->speed = speed; | |
208 | packet->generation = generation; | |
730c32f5 | 209 | packet->ack = 0; |
3038e353 KH |
210 | } |
211 | ||
212 | /** | |
213 | * This function provides low-level access to the IEEE1394 transaction | |
214 | * logic. Most C programs would use either fw_read(), fw_write() or | |
215 | * fw_lock() instead - those function are convenience wrappers for | |
216 | * this function. The fw_send_request() function is primarily | |
217 | * provided as a flexible, one-stop entry point for languages bindings | |
218 | * and protocol bindings. | |
219 | * | |
220 | * FIXME: Document this function further, in particular the possible | |
221 | * values for rcode in the callback. In short, we map ACK_COMPLETE to | |
222 | * RCODE_COMPLETE, internal errors set errno and set rcode to | |
223 | * RCODE_SEND_ERROR (which is out of range for standard ieee1394 | |
224 | * rcodes). All other rcodes are forwarded unchanged. For all | |
225 | * errors, payload is NULL, length is 0. | |
226 | * | |
227 | * Can not expect the callback to be called before the function | |
228 | * returns, though this does happen in some cases (ACK_COMPLETE and | |
229 | * errors). | |
230 | * | |
231 | * The payload is only used for write requests and must not be freed | |
232 | * until the callback has been called. | |
233 | * | |
234 | * @param card the card from which to send the request | |
235 | * @param tcode the tcode for this transaction. Do not use | |
dbe7f76d | 236 | * TCODE_LOCK_REQUEST directly, instead use TCODE_LOCK_MASK_SWAP |
3038e353 | 237 | * etc. to specify tcode and ext_tcode. |
907293d7 | 238 | * @param node_id the destination node ID (bus ID and PHY ID concatenated) |
3038e353 KH |
239 | * @param generation the generation for which node_id is valid |
240 | * @param speed the speed to use for sending the request | |
241 | * @param offset the 48 bit offset on the destination node | |
242 | * @param payload the data payload for the request subaction | |
243 | * @param length the length in bytes of the data to read | |
244 | * @param callback function to be called when the transaction is completed | |
245 | * @param callback_data pointer to arbitrary data, which will be | |
246 | * passed to the callback | |
247 | */ | |
248 | void | |
249 | fw_send_request(struct fw_card *card, struct fw_transaction *t, | |
1e119fa9 | 250 | int tcode, int destination_id, int generation, int speed, |
3038e353 KH |
251 | unsigned long long offset, |
252 | void *payload, size_t length, | |
253 | fw_transaction_callback_t callback, void *callback_data) | |
254 | { | |
255 | unsigned long flags; | |
b9549bc6 | 256 | int tlabel; |
3038e353 | 257 | |
c781c06d KH |
258 | /* |
259 | * Bump the flush timer up 100ms first of all so we | |
260 | * don't race with a flush timer callback. | |
261 | */ | |
3038e353 KH |
262 | |
263 | mod_timer(&card->flush_timer, jiffies + DIV_ROUND_UP(HZ, 10)); | |
264 | ||
c781c06d KH |
265 | /* |
266 | * Allocate tlabel from the bitmap and put the transaction on | |
267 | * the list while holding the card spinlock. | |
268 | */ | |
3038e353 KH |
269 | |
270 | spin_lock_irqsave(&card->lock, flags); | |
271 | ||
272 | tlabel = card->current_tlabel; | |
273 | if (card->tlabel_mask & (1 << tlabel)) { | |
274 | spin_unlock_irqrestore(&card->lock, flags); | |
275 | callback(card, RCODE_SEND_ERROR, NULL, 0, callback_data); | |
276 | return; | |
277 | } | |
278 | ||
279 | card->current_tlabel = (card->current_tlabel + 1) & 0x1f; | |
280 | card->tlabel_mask |= (1 << tlabel); | |
281 | ||
1e119fa9 | 282 | t->node_id = destination_id; |
3038e353 KH |
283 | t->tlabel = tlabel; |
284 | t->callback = callback; | |
285 | t->callback_data = callback_data; | |
286 | ||
1e119fa9 JF |
287 | fw_fill_request(&t->packet, tcode, t->tlabel, |
288 | destination_id, card->node_id, generation, | |
289 | speed, offset, payload, length); | |
3038e353 KH |
290 | t->packet.callback = transmit_complete_callback; |
291 | ||
e9aeb46c SR |
292 | list_add_tail(&t->link, &card->transaction_list); |
293 | ||
294 | spin_unlock_irqrestore(&card->lock, flags); | |
295 | ||
3038e353 KH |
296 | card->driver->send_request(card, &t->packet); |
297 | } | |
298 | EXPORT_SYMBOL(fw_send_request); | |
299 | ||
1e119fa9 JF |
300 | struct transaction_callback_data { |
301 | struct completion done; | |
302 | void *payload; | |
303 | int rcode; | |
304 | }; | |
305 | ||
306 | static void transaction_callback(struct fw_card *card, int rcode, | |
307 | void *payload, size_t length, void *data) | |
308 | { | |
309 | struct transaction_callback_data *d = data; | |
310 | ||
311 | if (rcode == RCODE_COMPLETE) | |
312 | memcpy(d->payload, payload, length); | |
313 | d->rcode = rcode; | |
314 | complete(&d->done); | |
315 | } | |
316 | ||
317 | /** | |
318 | * fw_run_transaction - send request and sleep until transaction is completed | |
319 | * | |
320 | * Returns the RCODE. | |
321 | */ | |
322 | int fw_run_transaction(struct fw_card *card, int tcode, int destination_id, | |
323 | int generation, int speed, unsigned long long offset, | |
324 | void *data, size_t length) | |
325 | { | |
326 | struct transaction_callback_data d; | |
327 | struct fw_transaction t; | |
328 | ||
329 | init_completion(&d.done); | |
330 | d.payload = data; | |
331 | fw_send_request(card, &t, tcode, destination_id, generation, speed, | |
332 | offset, data, length, transaction_callback, &d); | |
333 | wait_for_completion(&d.done); | |
334 | ||
335 | return d.rcode; | |
336 | } | |
337 | EXPORT_SYMBOL(fw_run_transaction); | |
338 | ||
c0220d68 SR |
339 | static DEFINE_MUTEX(phy_config_mutex); |
340 | static DECLARE_COMPLETION(phy_config_done); | |
ae1e5355 SR |
341 | |
342 | static void transmit_phy_packet_callback(struct fw_packet *packet, | |
343 | struct fw_card *card, int status) | |
3038e353 | 344 | { |
c0220d68 | 345 | complete(&phy_config_done); |
3038e353 KH |
346 | } |
347 | ||
c0220d68 SR |
348 | static struct fw_packet phy_config_packet = { |
349 | .header_length = 8, | |
350 | .payload_length = 0, | |
351 | .speed = SCODE_100, | |
352 | .callback = transmit_phy_packet_callback, | |
353 | }; | |
354 | ||
83db801c KH |
355 | void fw_send_phy_config(struct fw_card *card, |
356 | int node_id, int generation, int gap_count) | |
3038e353 | 357 | { |
ae1e5355 | 358 | long timeout = DIV_ROUND_UP(HZ, 10); |
2a0a2590 SR |
359 | u32 data = PHY_IDENTIFIER(PHY_PACKET_CONFIG) | |
360 | PHY_CONFIG_ROOT_ID(node_id) | | |
361 | PHY_CONFIG_GAP_COUNT(gap_count); | |
362 | ||
c0220d68 SR |
363 | mutex_lock(&phy_config_mutex); |
364 | ||
365 | phy_config_packet.header[0] = data; | |
366 | phy_config_packet.header[1] = ~data; | |
367 | phy_config_packet.generation = generation; | |
368 | INIT_COMPLETION(phy_config_done); | |
369 | ||
370 | card->driver->send_request(card, &phy_config_packet); | |
371 | wait_for_completion_timeout(&phy_config_done, timeout); | |
ae1e5355 | 372 | |
c0220d68 | 373 | mutex_unlock(&phy_config_mutex); |
3038e353 KH |
374 | } |
375 | ||
376 | void fw_flush_transactions(struct fw_card *card) | |
377 | { | |
378 | struct fw_transaction *t, *next; | |
379 | struct list_head list; | |
380 | unsigned long flags; | |
381 | ||
382 | INIT_LIST_HEAD(&list); | |
383 | spin_lock_irqsave(&card->lock, flags); | |
384 | list_splice_init(&card->transaction_list, &list); | |
385 | card->tlabel_mask = 0; | |
386 | spin_unlock_irqrestore(&card->lock, flags); | |
387 | ||
730c32f5 KH |
388 | list_for_each_entry_safe(t, next, &list, link) { |
389 | card->driver->cancel_packet(card, &t->packet); | |
390 | ||
c781c06d KH |
391 | /* |
392 | * At this point cancel_packet will never call the | |
730c32f5 | 393 | * transaction callback, since we just took all the |
c781c06d KH |
394 | * transactions out of the list. So do it here. |
395 | */ | |
3038e353 | 396 | t->callback(card, RCODE_CANCELLED, NULL, 0, t->callback_data); |
730c32f5 | 397 | } |
3038e353 KH |
398 | } |
399 | ||
400 | static struct fw_address_handler * | |
401 | lookup_overlapping_address_handler(struct list_head *list, | |
402 | unsigned long long offset, size_t length) | |
403 | { | |
404 | struct fw_address_handler *handler; | |
405 | ||
406 | list_for_each_entry(handler, list, link) { | |
407 | if (handler->offset < offset + length && | |
408 | offset < handler->offset + handler->length) | |
409 | return handler; | |
410 | } | |
411 | ||
412 | return NULL; | |
413 | } | |
414 | ||
415 | static struct fw_address_handler * | |
416 | lookup_enclosing_address_handler(struct list_head *list, | |
417 | unsigned long long offset, size_t length) | |
418 | { | |
419 | struct fw_address_handler *handler; | |
420 | ||
421 | list_for_each_entry(handler, list, link) { | |
422 | if (handler->offset <= offset && | |
423 | offset + length <= handler->offset + handler->length) | |
424 | return handler; | |
425 | } | |
426 | ||
427 | return NULL; | |
428 | } | |
429 | ||
430 | static DEFINE_SPINLOCK(address_handler_lock); | |
431 | static LIST_HEAD(address_handler_list); | |
432 | ||
21ebcd12 | 433 | const struct fw_address_region fw_high_memory_region = |
5af4e5ea | 434 | { .start = 0x000100000000ULL, .end = 0xffffe0000000ULL, }; |
db8be076 AB |
435 | EXPORT_SYMBOL(fw_high_memory_region); |
436 | ||
437 | #if 0 | |
438 | const struct fw_address_region fw_low_memory_region = | |
439 | { .start = 0x000000000000ULL, .end = 0x000100000000ULL, }; | |
21ebcd12 | 440 | const struct fw_address_region fw_private_region = |
5af4e5ea | 441 | { .start = 0xffffe0000000ULL, .end = 0xfffff0000000ULL, }; |
21ebcd12 | 442 | const struct fw_address_region fw_csr_region = |
cca60977 JW |
443 | { .start = CSR_REGISTER_BASE, |
444 | .end = CSR_REGISTER_BASE | CSR_CONFIG_ROM_END, }; | |
21ebcd12 | 445 | const struct fw_address_region fw_unit_space_region = |
5af4e5ea | 446 | { .start = 0xfffff0000900ULL, .end = 0x1000000000000ULL, }; |
db8be076 | 447 | #endif /* 0 */ |
3038e353 KH |
448 | |
449 | /** | |
450 | * Allocate a range of addresses in the node space of the OHCI | |
451 | * controller. When a request is received that falls within the | |
452 | * specified address range, the specified callback is invoked. The | |
453 | * parameters passed to the callback give the details of the | |
1415d918 SR |
454 | * particular request. |
455 | * | |
456 | * Return value: 0 on success, non-zero otherwise. | |
457 | * The start offset of the handler's address region is determined by | |
458 | * fw_core_add_address_handler() and is returned in handler->offset. | |
459 | * The offset is quadlet-aligned. | |
3038e353 | 460 | */ |
3038e353 KH |
461 | int |
462 | fw_core_add_address_handler(struct fw_address_handler *handler, | |
21ebcd12 | 463 | const struct fw_address_region *region) |
3038e353 KH |
464 | { |
465 | struct fw_address_handler *other; | |
466 | unsigned long flags; | |
467 | int ret = -EBUSY; | |
468 | ||
469 | spin_lock_irqsave(&address_handler_lock, flags); | |
470 | ||
1415d918 | 471 | handler->offset = roundup(region->start, 4); |
3038e353 KH |
472 | while (handler->offset + handler->length <= region->end) { |
473 | other = | |
474 | lookup_overlapping_address_handler(&address_handler_list, | |
475 | handler->offset, | |
476 | handler->length); | |
477 | if (other != NULL) { | |
1415d918 SR |
478 | handler->offset = |
479 | roundup(other->offset + other->length, 4); | |
3038e353 KH |
480 | } else { |
481 | list_add_tail(&handler->link, &address_handler_list); | |
482 | ret = 0; | |
483 | break; | |
484 | } | |
485 | } | |
486 | ||
487 | spin_unlock_irqrestore(&address_handler_lock, flags); | |
488 | ||
489 | return ret; | |
490 | } | |
3038e353 KH |
491 | EXPORT_SYMBOL(fw_core_add_address_handler); |
492 | ||
493 | /** | |
494 | * Deallocate a range of addresses allocated with fw_allocate. This | |
495 | * will call the associated callback one last time with a the special | |
496 | * tcode TCODE_DEALLOCATE, to let the client destroy the registered | |
497 | * callback data. For convenience, the callback parameters offset and | |
498 | * length are set to the start and the length respectively for the | |
499 | * deallocated region, payload is set to NULL. | |
500 | */ | |
3038e353 KH |
501 | void fw_core_remove_address_handler(struct fw_address_handler *handler) |
502 | { | |
503 | unsigned long flags; | |
504 | ||
505 | spin_lock_irqsave(&address_handler_lock, flags); | |
506 | list_del(&handler->link); | |
507 | spin_unlock_irqrestore(&address_handler_lock, flags); | |
508 | } | |
3038e353 KH |
509 | EXPORT_SYMBOL(fw_core_remove_address_handler); |
510 | ||
511 | struct fw_request { | |
512 | struct fw_packet response; | |
36bfe49d | 513 | u32 request_header[4]; |
3038e353 KH |
514 | int ack; |
515 | u32 length; | |
516 | u32 data[0]; | |
517 | }; | |
518 | ||
519 | static void | |
520 | free_response_callback(struct fw_packet *packet, | |
521 | struct fw_card *card, int status) | |
522 | { | |
523 | struct fw_request *request; | |
524 | ||
525 | request = container_of(packet, struct fw_request, response); | |
526 | kfree(request); | |
527 | } | |
528 | ||
93c4cceb | 529 | void |
36bfe49d KH |
530 | fw_fill_response(struct fw_packet *response, u32 *request_header, |
531 | int rcode, void *payload, size_t length) | |
3038e353 KH |
532 | { |
533 | int tcode, tlabel, extended_tcode, source, destination; | |
534 | ||
a77754a7 KH |
535 | tcode = HEADER_GET_TCODE(request_header[0]); |
536 | tlabel = HEADER_GET_TLABEL(request_header[0]); | |
537 | source = HEADER_GET_DESTINATION(request_header[0]); | |
538 | destination = HEADER_GET_SOURCE(request_header[1]); | |
539 | extended_tcode = HEADER_GET_EXTENDED_TCODE(request_header[3]); | |
3038e353 KH |
540 | |
541 | response->header[0] = | |
a77754a7 KH |
542 | HEADER_RETRY(RETRY_1) | |
543 | HEADER_TLABEL(tlabel) | | |
544 | HEADER_DESTINATION(destination); | |
36bfe49d | 545 | response->header[1] = |
a77754a7 KH |
546 | HEADER_SOURCE(source) | |
547 | HEADER_RCODE(rcode); | |
3038e353 KH |
548 | response->header[2] = 0; |
549 | ||
550 | switch (tcode) { | |
551 | case TCODE_WRITE_QUADLET_REQUEST: | |
552 | case TCODE_WRITE_BLOCK_REQUEST: | |
a77754a7 | 553 | response->header[0] |= HEADER_TCODE(TCODE_WRITE_RESPONSE); |
3038e353 KH |
554 | response->header_length = 12; |
555 | response->payload_length = 0; | |
556 | break; | |
557 | ||
558 | case TCODE_READ_QUADLET_REQUEST: | |
559 | response->header[0] |= | |
a77754a7 | 560 | HEADER_TCODE(TCODE_READ_QUADLET_RESPONSE); |
93c4cceb KH |
561 | if (payload != NULL) |
562 | response->header[3] = *(u32 *)payload; | |
563 | else | |
564 | response->header[3] = 0; | |
3038e353 KH |
565 | response->header_length = 16; |
566 | response->payload_length = 0; | |
567 | break; | |
568 | ||
569 | case TCODE_READ_BLOCK_REQUEST: | |
570 | case TCODE_LOCK_REQUEST: | |
a77754a7 | 571 | response->header[0] |= HEADER_TCODE(tcode + 2); |
3038e353 | 572 | response->header[3] = |
a77754a7 KH |
573 | HEADER_DATA_LENGTH(length) | |
574 | HEADER_EXTENDED_TCODE(extended_tcode); | |
3038e353 | 575 | response->header_length = 16; |
36bfe49d KH |
576 | response->payload = payload; |
577 | response->payload_length = length; | |
3038e353 KH |
578 | break; |
579 | ||
580 | default: | |
581 | BUG(); | |
582 | return; | |
583 | } | |
584 | } | |
93c4cceb | 585 | EXPORT_SYMBOL(fw_fill_response); |
3038e353 KH |
586 | |
587 | static struct fw_request * | |
2639a6fb | 588 | allocate_request(struct fw_packet *p) |
3038e353 KH |
589 | { |
590 | struct fw_request *request; | |
591 | u32 *data, length; | |
2639a6fb | 592 | int request_tcode, t; |
3038e353 | 593 | |
a77754a7 | 594 | request_tcode = HEADER_GET_TCODE(p->header[0]); |
3038e353 KH |
595 | switch (request_tcode) { |
596 | case TCODE_WRITE_QUADLET_REQUEST: | |
2639a6fb | 597 | data = &p->header[3]; |
3038e353 KH |
598 | length = 4; |
599 | break; | |
600 | ||
601 | case TCODE_WRITE_BLOCK_REQUEST: | |
602 | case TCODE_LOCK_REQUEST: | |
2639a6fb | 603 | data = p->payload; |
a77754a7 | 604 | length = HEADER_GET_DATA_LENGTH(p->header[3]); |
3038e353 KH |
605 | break; |
606 | ||
607 | case TCODE_READ_QUADLET_REQUEST: | |
608 | data = NULL; | |
609 | length = 4; | |
610 | break; | |
611 | ||
612 | case TCODE_READ_BLOCK_REQUEST: | |
613 | data = NULL; | |
a77754a7 | 614 | length = HEADER_GET_DATA_LENGTH(p->header[3]); |
3038e353 KH |
615 | break; |
616 | ||
617 | default: | |
0bf607c5 SR |
618 | fw_error("ERROR - corrupt request received - %08x %08x %08x\n", |
619 | p->header[0], p->header[1], p->header[2]); | |
3038e353 KH |
620 | return NULL; |
621 | } | |
622 | ||
2d826cc5 | 623 | request = kmalloc(sizeof(*request) + length, GFP_ATOMIC); |
3038e353 KH |
624 | if (request == NULL) |
625 | return NULL; | |
626 | ||
2639a6fb KH |
627 | t = (p->timestamp & 0x1fff) + 4000; |
628 | if (t >= 8000) | |
629 | t = (p->timestamp & ~0x1fff) + 0x2000 + t - 8000; | |
630 | else | |
631 | t = (p->timestamp & ~0x1fff) + t; | |
632 | ||
633 | request->response.speed = p->speed; | |
634 | request->response.timestamp = t; | |
635 | request->response.generation = p->generation; | |
730c32f5 | 636 | request->response.ack = 0; |
3038e353 | 637 | request->response.callback = free_response_callback; |
2639a6fb | 638 | request->ack = p->ack; |
93c4cceb | 639 | request->length = length; |
3038e353 | 640 | if (data) |
6e2e8424 | 641 | memcpy(request->data, data, length); |
3038e353 | 642 | |
2d826cc5 | 643 | memcpy(request->request_header, p->header, sizeof(p->header)); |
3038e353 KH |
644 | |
645 | return request; | |
646 | } | |
647 | ||
648 | void | |
649 | fw_send_response(struct fw_card *card, struct fw_request *request, int rcode) | |
650 | { | |
a7ea6782 SR |
651 | /* unified transaction or broadcast transaction: don't respond */ |
652 | if (request->ack != ACK_PENDING || | |
653 | HEADER_DESTINATION_IS_BROADCAST(request->request_header[0])) { | |
9c9bdf4d | 654 | kfree(request); |
3038e353 | 655 | return; |
9c9bdf4d | 656 | } |
3038e353 | 657 | |
36bfe49d KH |
658 | if (rcode == RCODE_COMPLETE) |
659 | fw_fill_response(&request->response, request->request_header, | |
660 | rcode, request->data, request->length); | |
661 | else | |
662 | fw_fill_response(&request->response, request->request_header, | |
663 | rcode, NULL, 0); | |
3038e353 KH |
664 | |
665 | card->driver->send_response(card, &request->response); | |
666 | } | |
3038e353 KH |
667 | EXPORT_SYMBOL(fw_send_response); |
668 | ||
669 | void | |
2639a6fb | 670 | fw_core_handle_request(struct fw_card *card, struct fw_packet *p) |
3038e353 KH |
671 | { |
672 | struct fw_address_handler *handler; | |
673 | struct fw_request *request; | |
674 | unsigned long long offset; | |
675 | unsigned long flags; | |
2639a6fb | 676 | int tcode, destination, source; |
3038e353 | 677 | |
2639a6fb | 678 | if (p->ack != ACK_PENDING && p->ack != ACK_COMPLETE) |
3038e353 KH |
679 | return; |
680 | ||
2639a6fb | 681 | request = allocate_request(p); |
3038e353 KH |
682 | if (request == NULL) { |
683 | /* FIXME: send statically allocated busy packet. */ | |
684 | return; | |
685 | } | |
686 | ||
687 | offset = | |
688 | ((unsigned long long) | |
a77754a7 KH |
689 | HEADER_GET_OFFSET_HIGH(p->header[1]) << 32) | p->header[2]; |
690 | tcode = HEADER_GET_TCODE(p->header[0]); | |
691 | destination = HEADER_GET_DESTINATION(p->header[0]); | |
478b233e | 692 | source = HEADER_GET_SOURCE(p->header[1]); |
3038e353 KH |
693 | |
694 | spin_lock_irqsave(&address_handler_lock, flags); | |
695 | handler = lookup_enclosing_address_handler(&address_handler_list, | |
696 | offset, request->length); | |
697 | spin_unlock_irqrestore(&address_handler_lock, flags); | |
698 | ||
c781c06d KH |
699 | /* |
700 | * FIXME: lookup the fw_node corresponding to the sender of | |
3038e353 KH |
701 | * this request and pass that to the address handler instead |
702 | * of the node ID. We may also want to move the address | |
703 | * allocations to fw_node so we only do this callback if the | |
c781c06d KH |
704 | * upper layers registered it for this node. |
705 | */ | |
3038e353 KH |
706 | |
707 | if (handler == NULL) | |
708 | fw_send_response(card, request, RCODE_ADDRESS_ERROR); | |
709 | else | |
710 | handler->address_callback(card, request, | |
711 | tcode, destination, source, | |
2639a6fb | 712 | p->generation, p->speed, offset, |
3038e353 KH |
713 | request->data, request->length, |
714 | handler->callback_data); | |
715 | } | |
3038e353 KH |
716 | EXPORT_SYMBOL(fw_core_handle_request); |
717 | ||
718 | void | |
2639a6fb | 719 | fw_core_handle_response(struct fw_card *card, struct fw_packet *p) |
3038e353 KH |
720 | { |
721 | struct fw_transaction *t; | |
722 | unsigned long flags; | |
723 | u32 *data; | |
724 | size_t data_length; | |
725 | int tcode, tlabel, destination, source, rcode; | |
726 | ||
a77754a7 KH |
727 | tcode = HEADER_GET_TCODE(p->header[0]); |
728 | tlabel = HEADER_GET_TLABEL(p->header[0]); | |
729 | destination = HEADER_GET_DESTINATION(p->header[0]); | |
730 | source = HEADER_GET_SOURCE(p->header[1]); | |
731 | rcode = HEADER_GET_RCODE(p->header[1]); | |
3038e353 KH |
732 | |
733 | spin_lock_irqsave(&card->lock, flags); | |
734 | list_for_each_entry(t, &card->transaction_list, link) { | |
735 | if (t->node_id == source && t->tlabel == tlabel) { | |
736 | list_del(&t->link); | |
737 | card->tlabel_mask &= ~(1 << t->tlabel); | |
738 | break; | |
739 | } | |
740 | } | |
741 | spin_unlock_irqrestore(&card->lock, flags); | |
742 | ||
743 | if (&t->link == &card->transaction_list) { | |
32b46093 KH |
744 | fw_notify("Unsolicited response (source %x, tlabel %x)\n", |
745 | source, tlabel); | |
3038e353 KH |
746 | return; |
747 | } | |
748 | ||
c781c06d KH |
749 | /* |
750 | * FIXME: sanity check packet, is length correct, does tcodes | |
751 | * and addresses match. | |
752 | */ | |
3038e353 KH |
753 | |
754 | switch (tcode) { | |
755 | case TCODE_READ_QUADLET_RESPONSE: | |
2639a6fb | 756 | data = (u32 *) &p->header[3]; |
3038e353 KH |
757 | data_length = 4; |
758 | break; | |
759 | ||
760 | case TCODE_WRITE_RESPONSE: | |
761 | data = NULL; | |
762 | data_length = 0; | |
763 | break; | |
764 | ||
765 | case TCODE_READ_BLOCK_RESPONSE: | |
766 | case TCODE_LOCK_RESPONSE: | |
93c4cceb | 767 | data = p->payload; |
a77754a7 | 768 | data_length = HEADER_GET_DATA_LENGTH(p->header[3]); |
3038e353 KH |
769 | break; |
770 | ||
771 | default: | |
772 | /* Should never happen, this is just to shut up gcc. */ | |
773 | data = NULL; | |
774 | data_length = 0; | |
775 | break; | |
776 | } | |
777 | ||
10a4c735 SR |
778 | /* |
779 | * The response handler may be executed while the request handler | |
780 | * is still pending. Cancel the request handler. | |
781 | */ | |
782 | card->driver->cancel_packet(card, &t->packet); | |
783 | ||
3038e353 KH |
784 | t->callback(card, rcode, data, data_length, t->callback_data); |
785 | } | |
3038e353 KH |
786 | EXPORT_SYMBOL(fw_core_handle_response); |
787 | ||
ae57988f | 788 | static const struct fw_address_region topology_map_region = |
cca60977 JW |
789 | { .start = CSR_REGISTER_BASE | CSR_TOPOLOGY_MAP, |
790 | .end = CSR_REGISTER_BASE | CSR_TOPOLOGY_MAP_END, }; | |
473d28c7 KH |
791 | |
792 | static void | |
793 | handle_topology_map(struct fw_card *card, struct fw_request *request, | |
794 | int tcode, int destination, int source, | |
795 | int generation, int speed, | |
796 | unsigned long long offset, | |
797 | void *payload, size_t length, void *callback_data) | |
798 | { | |
799 | int i, start, end; | |
efbf390a | 800 | __be32 *map; |
473d28c7 KH |
801 | |
802 | if (!TCODE_IS_READ_REQUEST(tcode)) { | |
803 | fw_send_response(card, request, RCODE_TYPE_ERROR); | |
804 | return; | |
805 | } | |
806 | ||
807 | if ((offset & 3) > 0 || (length & 3) > 0) { | |
808 | fw_send_response(card, request, RCODE_ADDRESS_ERROR); | |
809 | return; | |
810 | } | |
811 | ||
812 | start = (offset - topology_map_region.start) / 4; | |
813 | end = start + length / 4; | |
814 | map = payload; | |
815 | ||
816 | for (i = 0; i < length / 4; i++) | |
817 | map[i] = cpu_to_be32(card->topology_map[start + i]); | |
818 | ||
819 | fw_send_response(card, request, RCODE_COMPLETE); | |
820 | } | |
821 | ||
822 | static struct fw_address_handler topology_map = { | |
d60d7f1d | 823 | .length = 0x200, |
473d28c7 KH |
824 | .address_callback = handle_topology_map, |
825 | }; | |
826 | ||
ae57988f | 827 | static const struct fw_address_region registers_region = |
cca60977 JW |
828 | { .start = CSR_REGISTER_BASE, |
829 | .end = CSR_REGISTER_BASE | CSR_CONFIG_ROM, }; | |
d60d7f1d KH |
830 | |
831 | static void | |
832 | handle_registers(struct fw_card *card, struct fw_request *request, | |
833 | int tcode, int destination, int source, | |
834 | int generation, int speed, | |
835 | unsigned long long offset, | |
836 | void *payload, size_t length, void *callback_data) | |
837 | { | |
15f0d833 | 838 | int reg = offset & ~CSR_REGISTER_BASE; |
d60d7f1d KH |
839 | unsigned long long bus_time; |
840 | __be32 *data = payload; | |
e534fe16 | 841 | int rcode = RCODE_COMPLETE; |
d60d7f1d KH |
842 | |
843 | switch (reg) { | |
844 | case CSR_CYCLE_TIME: | |
845 | case CSR_BUS_TIME: | |
846 | if (!TCODE_IS_READ_REQUEST(tcode) || length != 4) { | |
e534fe16 | 847 | rcode = RCODE_TYPE_ERROR; |
d60d7f1d KH |
848 | break; |
849 | } | |
850 | ||
851 | bus_time = card->driver->get_bus_time(card); | |
852 | if (reg == CSR_CYCLE_TIME) | |
853 | *data = cpu_to_be32(bus_time); | |
854 | else | |
855 | *data = cpu_to_be32(bus_time >> 25); | |
e534fe16 SR |
856 | break; |
857 | ||
858 | case CSR_BROADCAST_CHANNEL: | |
859 | if (tcode == TCODE_READ_QUADLET_REQUEST) | |
860 | *data = cpu_to_be32(card->broadcast_channel); | |
861 | else if (tcode == TCODE_WRITE_QUADLET_REQUEST) | |
862 | card->broadcast_channel = | |
863 | (be32_to_cpu(*data) & BROADCAST_CHANNEL_VALID) | | |
864 | BROADCAST_CHANNEL_INITIAL; | |
865 | else | |
866 | rcode = RCODE_TYPE_ERROR; | |
d60d7f1d KH |
867 | break; |
868 | ||
869 | case CSR_BUS_MANAGER_ID: | |
870 | case CSR_BANDWIDTH_AVAILABLE: | |
871 | case CSR_CHANNELS_AVAILABLE_HI: | |
872 | case CSR_CHANNELS_AVAILABLE_LO: | |
c781c06d KH |
873 | /* |
874 | * FIXME: these are handled by the OHCI hardware and | |
d60d7f1d KH |
875 | * the stack never sees these request. If we add |
876 | * support for a new type of controller that doesn't | |
877 | * handle this in hardware we need to deal with these | |
c781c06d KH |
878 | * transactions. |
879 | */ | |
d60d7f1d KH |
880 | BUG(); |
881 | break; | |
882 | ||
883 | case CSR_BUSY_TIMEOUT: | |
884 | /* FIXME: Implement this. */ | |
e534fe16 | 885 | |
d60d7f1d | 886 | default: |
e534fe16 | 887 | rcode = RCODE_ADDRESS_ERROR; |
d60d7f1d KH |
888 | break; |
889 | } | |
e534fe16 SR |
890 | |
891 | fw_send_response(card, request, rcode); | |
d60d7f1d KH |
892 | } |
893 | ||
894 | static struct fw_address_handler registers = { | |
895 | .length = 0x400, | |
896 | .address_callback = handle_registers, | |
897 | }; | |
898 | ||
3038e353 KH |
899 | MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>"); |
900 | MODULE_DESCRIPTION("Core IEEE1394 transaction logic"); | |
901 | MODULE_LICENSE("GPL"); | |
902 | ||
937f6879 | 903 | static const u32 vendor_textual_descriptor[] = { |
3038e353 | 904 | /* textual descriptor leaf () */ |
937f6879 | 905 | 0x00060000, |
3038e353 KH |
906 | 0x00000000, |
907 | 0x00000000, | |
908 | 0x4c696e75, /* L i n u */ | |
909 | 0x78204669, /* x F i */ | |
910 | 0x72657769, /* r e w i */ | |
937f6879 | 911 | 0x72650000, /* r e */ |
3038e353 KH |
912 | }; |
913 | ||
937f6879 KH |
914 | static const u32 model_textual_descriptor[] = { |
915 | /* model descriptor leaf () */ | |
916 | 0x00030000, | |
917 | 0x00000000, | |
918 | 0x00000000, | |
919 | 0x4a756a75, /* J u j u */ | |
920 | }; | |
921 | ||
922 | static struct fw_descriptor vendor_id_descriptor = { | |
923 | .length = ARRAY_SIZE(vendor_textual_descriptor), | |
924 | .immediate = 0x03d00d1e, | |
3038e353 | 925 | .key = 0x81000000, |
937f6879 KH |
926 | .data = vendor_textual_descriptor, |
927 | }; | |
928 | ||
929 | static struct fw_descriptor model_id_descriptor = { | |
930 | .length = ARRAY_SIZE(model_textual_descriptor), | |
931 | .immediate = 0x17000001, | |
932 | .key = 0x81000000, | |
933 | .data = model_textual_descriptor, | |
3038e353 KH |
934 | }; |
935 | ||
3038e353 KH |
936 | static int __init fw_core_init(void) |
937 | { | |
938 | int retval; | |
939 | ||
940 | retval = bus_register(&fw_bus_type); | |
941 | if (retval < 0) | |
942 | return retval; | |
943 | ||
a3aca3da KH |
944 | fw_cdev_major = register_chrdev(0, "firewire", &fw_device_ops); |
945 | if (fw_cdev_major < 0) { | |
946 | bus_unregister(&fw_bus_type); | |
947 | return fw_cdev_major; | |
948 | } | |
949 | ||
473d28c7 KH |
950 | retval = fw_core_add_address_handler(&topology_map, |
951 | &topology_map_region); | |
952 | BUG_ON(retval < 0); | |
953 | ||
d60d7f1d KH |
954 | retval = fw_core_add_address_handler(®isters, |
955 | ®isters_region); | |
956 | BUG_ON(retval < 0); | |
957 | ||
3038e353 | 958 | /* Add the vendor textual descriptor. */ |
937f6879 KH |
959 | retval = fw_core_add_descriptor(&vendor_id_descriptor); |
960 | BUG_ON(retval < 0); | |
961 | retval = fw_core_add_descriptor(&model_id_descriptor); | |
3038e353 KH |
962 | BUG_ON(retval < 0); |
963 | ||
964 | return 0; | |
965 | } | |
966 | ||
967 | static void __exit fw_core_cleanup(void) | |
968 | { | |
a3aca3da | 969 | unregister_chrdev(fw_cdev_major, "firewire"); |
3038e353 KH |
970 | bus_unregister(&fw_bus_type); |
971 | } | |
972 | ||
973 | module_init(fw_core_init); | |
974 | module_exit(fw_core_cleanup); |