]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software Foundation, | |
16 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | */ | |
18 | ||
19 | #include <linux/completion.h> | |
20 | #include <linux/crc-itu-t.h> | |
21 | #include <linux/delay.h> | |
22 | #include <linux/device.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/kref.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/mutex.h> | |
27 | ||
28 | #include "fw-transaction.h" | |
29 | #include "fw-topology.h" | |
30 | #include "fw-device.h" | |
31 | ||
32 | int fw_compute_block_crc(u32 *block) | |
33 | { | |
34 | __be32 be32_block[256]; | |
35 | int i, length; | |
36 | ||
37 | length = (*block >> 16) & 0xff; | |
38 | for (i = 0; i < length; i++) | |
39 | be32_block[i] = cpu_to_be32(block[i + 1]); | |
40 | *block |= crc_itu_t(0, (u8 *) be32_block, length * 4); | |
41 | ||
42 | return length; | |
43 | } | |
44 | ||
45 | static DEFINE_MUTEX(card_mutex); | |
46 | static LIST_HEAD(card_list); | |
47 | ||
48 | static LIST_HEAD(descriptor_list); | |
49 | static int descriptor_count; | |
50 | ||
51 | #define BIB_CRC(v) ((v) << 0) | |
52 | #define BIB_CRC_LENGTH(v) ((v) << 16) | |
53 | #define BIB_INFO_LENGTH(v) ((v) << 24) | |
54 | ||
55 | #define BIB_LINK_SPEED(v) ((v) << 0) | |
56 | #define BIB_GENERATION(v) ((v) << 4) | |
57 | #define BIB_MAX_ROM(v) ((v) << 8) | |
58 | #define BIB_MAX_RECEIVE(v) ((v) << 12) | |
59 | #define BIB_CYC_CLK_ACC(v) ((v) << 16) | |
60 | #define BIB_PMC ((1) << 27) | |
61 | #define BIB_BMC ((1) << 28) | |
62 | #define BIB_ISC ((1) << 29) | |
63 | #define BIB_CMC ((1) << 30) | |
64 | #define BIB_IMC ((1) << 31) | |
65 | ||
66 | static u32 * | |
67 | generate_config_rom(struct fw_card *card, size_t *config_rom_length) | |
68 | { | |
69 | struct fw_descriptor *desc; | |
70 | static u32 config_rom[256]; | |
71 | int i, j, length; | |
72 | ||
73 | /* | |
74 | * Initialize contents of config rom buffer. On the OHCI | |
75 | * controller, block reads to the config rom accesses the host | |
76 | * memory, but quadlet read access the hardware bus info block | |
77 | * registers. That's just crack, but it means we should make | |
78 | * sure the contents of bus info block in host memory mathces | |
79 | * the version stored in the OHCI registers. | |
80 | */ | |
81 | ||
82 | memset(config_rom, 0, sizeof(config_rom)); | |
83 | config_rom[0] = BIB_CRC_LENGTH(4) | BIB_INFO_LENGTH(4) | BIB_CRC(0); | |
84 | config_rom[1] = 0x31333934; | |
85 | ||
86 | config_rom[2] = | |
87 | BIB_LINK_SPEED(card->link_speed) | | |
88 | BIB_GENERATION(card->config_rom_generation++ % 14 + 2) | | |
89 | BIB_MAX_ROM(2) | | |
90 | BIB_MAX_RECEIVE(card->max_receive) | | |
91 | BIB_BMC | BIB_ISC | BIB_CMC | BIB_IMC; | |
92 | config_rom[3] = card->guid >> 32; | |
93 | config_rom[4] = card->guid; | |
94 | ||
95 | /* Generate root directory. */ | |
96 | i = 5; | |
97 | config_rom[i++] = 0; | |
98 | config_rom[i++] = 0x0c0083c0; /* node capabilities */ | |
99 | j = i + descriptor_count; | |
100 | ||
101 | /* Generate root directory entries for descriptors. */ | |
102 | list_for_each_entry (desc, &descriptor_list, link) { | |
103 | if (desc->immediate > 0) | |
104 | config_rom[i++] = desc->immediate; | |
105 | config_rom[i] = desc->key | (j - i); | |
106 | i++; | |
107 | j += desc->length; | |
108 | } | |
109 | ||
110 | /* Update root directory length. */ | |
111 | config_rom[5] = (i - 5 - 1) << 16; | |
112 | ||
113 | /* End of root directory, now copy in descriptors. */ | |
114 | list_for_each_entry (desc, &descriptor_list, link) { | |
115 | memcpy(&config_rom[i], desc->data, desc->length * 4); | |
116 | i += desc->length; | |
117 | } | |
118 | ||
119 | /* Calculate CRCs for all blocks in the config rom. This | |
120 | * assumes that CRC length and info length are identical for | |
121 | * the bus info block, which is always the case for this | |
122 | * implementation. */ | |
123 | for (i = 0; i < j; i += length + 1) | |
124 | length = fw_compute_block_crc(config_rom + i); | |
125 | ||
126 | *config_rom_length = j; | |
127 | ||
128 | return config_rom; | |
129 | } | |
130 | ||
131 | static void | |
132 | update_config_roms(void) | |
133 | { | |
134 | struct fw_card *card; | |
135 | u32 *config_rom; | |
136 | size_t length; | |
137 | ||
138 | list_for_each_entry (card, &card_list, link) { | |
139 | config_rom = generate_config_rom(card, &length); | |
140 | card->driver->set_config_rom(card, config_rom, length); | |
141 | } | |
142 | } | |
143 | ||
144 | int | |
145 | fw_core_add_descriptor(struct fw_descriptor *desc) | |
146 | { | |
147 | size_t i; | |
148 | ||
149 | /* | |
150 | * Check descriptor is valid; the length of all blocks in the | |
151 | * descriptor has to add up to exactly the length of the | |
152 | * block. | |
153 | */ | |
154 | i = 0; | |
155 | while (i < desc->length) | |
156 | i += (desc->data[i] >> 16) + 1; | |
157 | ||
158 | if (i != desc->length) | |
159 | return -EINVAL; | |
160 | ||
161 | mutex_lock(&card_mutex); | |
162 | ||
163 | list_add_tail(&desc->link, &descriptor_list); | |
164 | descriptor_count++; | |
165 | if (desc->immediate > 0) | |
166 | descriptor_count++; | |
167 | update_config_roms(); | |
168 | ||
169 | mutex_unlock(&card_mutex); | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
174 | void | |
175 | fw_core_remove_descriptor(struct fw_descriptor *desc) | |
176 | { | |
177 | mutex_lock(&card_mutex); | |
178 | ||
179 | list_del(&desc->link); | |
180 | descriptor_count--; | |
181 | if (desc->immediate > 0) | |
182 | descriptor_count--; | |
183 | update_config_roms(); | |
184 | ||
185 | mutex_unlock(&card_mutex); | |
186 | } | |
187 | ||
188 | static const char gap_count_table[] = { | |
189 | 63, 5, 7, 8, 10, 13, 16, 18, 21, 24, 26, 29, 32, 35, 37, 40 | |
190 | }; | |
191 | ||
192 | struct bm_data { | |
193 | struct fw_transaction t; | |
194 | struct { | |
195 | __be32 arg; | |
196 | __be32 data; | |
197 | } lock; | |
198 | u32 old; | |
199 | int rcode; | |
200 | struct completion done; | |
201 | }; | |
202 | ||
203 | static void | |
204 | complete_bm_lock(struct fw_card *card, int rcode, | |
205 | void *payload, size_t length, void *data) | |
206 | { | |
207 | struct bm_data *bmd = data; | |
208 | ||
209 | if (rcode == RCODE_COMPLETE) | |
210 | bmd->old = be32_to_cpu(*(__be32 *) payload); | |
211 | bmd->rcode = rcode; | |
212 | complete(&bmd->done); | |
213 | } | |
214 | ||
215 | static void | |
216 | fw_card_bm_work(struct work_struct *work) | |
217 | { | |
218 | struct fw_card *card = container_of(work, struct fw_card, work.work); | |
219 | struct fw_device *root_device; | |
220 | struct fw_node *root_node, *local_node; | |
221 | struct bm_data bmd; | |
222 | unsigned long flags; | |
223 | int root_id, new_root_id, irm_id, gap_count, generation, grace; | |
224 | bool do_reset = false; | |
225 | ||
226 | spin_lock_irqsave(&card->lock, flags); | |
227 | local_node = card->local_node; | |
228 | root_node = card->root_node; | |
229 | ||
230 | if (local_node == NULL) { | |
231 | spin_unlock_irqrestore(&card->lock, flags); | |
232 | return; | |
233 | } | |
234 | fw_node_get(local_node); | |
235 | fw_node_get(root_node); | |
236 | ||
237 | generation = card->generation; | |
238 | root_device = root_node->data; | |
239 | if (root_device) | |
240 | fw_device_get(root_device); | |
241 | root_id = root_node->node_id; | |
242 | grace = time_after(jiffies, card->reset_jiffies + DIV_ROUND_UP(HZ, 10)); | |
243 | ||
244 | if (card->bm_generation + 1 == generation || | |
245 | (card->bm_generation != generation && grace)) { | |
246 | /* | |
247 | * This first step is to figure out who is IRM and | |
248 | * then try to become bus manager. If the IRM is not | |
249 | * well defined (e.g. does not have an active link | |
250 | * layer or does not responds to our lock request, we | |
251 | * will have to do a little vigilante bus management. | |
252 | * In that case, we do a goto into the gap count logic | |
253 | * so that when we do the reset, we still optimize the | |
254 | * gap count. That could well save a reset in the | |
255 | * next generation. | |
256 | */ | |
257 | ||
258 | irm_id = card->irm_node->node_id; | |
259 | if (!card->irm_node->link_on) { | |
260 | new_root_id = local_node->node_id; | |
261 | fw_notify("IRM has link off, making local node (%02x) root.\n", | |
262 | new_root_id); | |
263 | goto pick_me; | |
264 | } | |
265 | ||
266 | bmd.lock.arg = cpu_to_be32(0x3f); | |
267 | bmd.lock.data = cpu_to_be32(local_node->node_id); | |
268 | ||
269 | spin_unlock_irqrestore(&card->lock, flags); | |
270 | ||
271 | init_completion(&bmd.done); | |
272 | fw_send_request(card, &bmd.t, TCODE_LOCK_COMPARE_SWAP, | |
273 | irm_id, generation, | |
274 | SCODE_100, CSR_REGISTER_BASE + CSR_BUS_MANAGER_ID, | |
275 | &bmd.lock, sizeof(bmd.lock), | |
276 | complete_bm_lock, &bmd); | |
277 | wait_for_completion(&bmd.done); | |
278 | ||
279 | if (bmd.rcode == RCODE_GENERATION) { | |
280 | /* | |
281 | * Another bus reset happened. Just return, | |
282 | * the BM work has been rescheduled. | |
283 | */ | |
284 | goto out; | |
285 | } | |
286 | ||
287 | if (bmd.rcode == RCODE_COMPLETE && bmd.old != 0x3f) | |
288 | /* Somebody else is BM, let them do the work. */ | |
289 | goto out; | |
290 | ||
291 | spin_lock_irqsave(&card->lock, flags); | |
292 | if (bmd.rcode != RCODE_COMPLETE) { | |
293 | /* | |
294 | * The lock request failed, maybe the IRM | |
295 | * isn't really IRM capable after all. Let's | |
296 | * do a bus reset and pick the local node as | |
297 | * root, and thus, IRM. | |
298 | */ | |
299 | new_root_id = local_node->node_id; | |
300 | fw_notify("BM lock failed, making local node (%02x) root.\n", | |
301 | new_root_id); | |
302 | goto pick_me; | |
303 | } | |
304 | } else if (card->bm_generation != generation) { | |
305 | /* | |
306 | * OK, we weren't BM in the last generation, and it's | |
307 | * less than 100ms since last bus reset. Reschedule | |
308 | * this task 100ms from now. | |
309 | */ | |
310 | spin_unlock_irqrestore(&card->lock, flags); | |
311 | schedule_delayed_work(&card->work, DIV_ROUND_UP(HZ, 10)); | |
312 | goto out; | |
313 | } | |
314 | ||
315 | /* | |
316 | * We're bus manager for this generation, so next step is to | |
317 | * make sure we have an active cycle master and do gap count | |
318 | * optimization. | |
319 | */ | |
320 | card->bm_generation = generation; | |
321 | ||
322 | if (root_device == NULL) { | |
323 | /* | |
324 | * Either link_on is false, or we failed to read the | |
325 | * config rom. In either case, pick another root. | |
326 | */ | |
327 | new_root_id = local_node->node_id; | |
328 | } else if (atomic_read(&root_device->state) != FW_DEVICE_RUNNING) { | |
329 | /* | |
330 | * If we haven't probed this device yet, bail out now | |
331 | * and let's try again once that's done. | |
332 | */ | |
333 | spin_unlock_irqrestore(&card->lock, flags); | |
334 | goto out; | |
335 | } else if (root_device->cmc) { | |
336 | /* | |
337 | * FIXME: I suppose we should set the cmstr bit in the | |
338 | * STATE_CLEAR register of this node, as described in | |
339 | * 1394-1995, 8.4.2.6. Also, send out a force root | |
340 | * packet for this node. | |
341 | */ | |
342 | new_root_id = root_id; | |
343 | } else { | |
344 | /* | |
345 | * Current root has an active link layer and we | |
346 | * successfully read the config rom, but it's not | |
347 | * cycle master capable. | |
348 | */ | |
349 | new_root_id = local_node->node_id; | |
350 | } | |
351 | ||
352 | pick_me: | |
353 | /* | |
354 | * Pick a gap count from 1394a table E-1. The table doesn't cover | |
355 | * the typically much larger 1394b beta repeater delays though. | |
356 | */ | |
357 | if (!card->beta_repeaters_present && | |
358 | root_node->max_hops < ARRAY_SIZE(gap_count_table)) | |
359 | gap_count = gap_count_table[root_node->max_hops]; | |
360 | else | |
361 | gap_count = 63; | |
362 | ||
363 | /* | |
364 | * Finally, figure out if we should do a reset or not. If we have | |
365 | * done less than 5 resets with the same physical topology and we | |
366 | * have either a new root or a new gap count setting, let's do it. | |
367 | */ | |
368 | ||
369 | if (card->bm_retries++ < 5 && | |
370 | (card->gap_count != gap_count || new_root_id != root_id)) | |
371 | do_reset = true; | |
372 | ||
373 | spin_unlock_irqrestore(&card->lock, flags); | |
374 | ||
375 | if (do_reset) { | |
376 | fw_notify("phy config: card %d, new root=%x, gap_count=%d\n", | |
377 | card->index, new_root_id, gap_count); | |
378 | fw_send_phy_config(card, new_root_id, generation, gap_count); | |
379 | fw_core_initiate_bus_reset(card, 1); | |
380 | } | |
381 | out: | |
382 | if (root_device) | |
383 | fw_device_put(root_device); | |
384 | fw_node_put(root_node); | |
385 | fw_node_put(local_node); | |
386 | } | |
387 | ||
388 | static void | |
389 | flush_timer_callback(unsigned long data) | |
390 | { | |
391 | struct fw_card *card = (struct fw_card *)data; | |
392 | ||
393 | fw_flush_transactions(card); | |
394 | } | |
395 | ||
396 | void | |
397 | fw_card_initialize(struct fw_card *card, const struct fw_card_driver *driver, | |
398 | struct device *device) | |
399 | { | |
400 | static atomic_t index = ATOMIC_INIT(-1); | |
401 | ||
402 | card->index = atomic_inc_return(&index); | |
403 | card->driver = driver; | |
404 | card->device = device; | |
405 | card->current_tlabel = 0; | |
406 | card->tlabel_mask = 0; | |
407 | card->color = 0; | |
408 | card->broadcast_channel = BROADCAST_CHANNEL_INITIAL; | |
409 | ||
410 | kref_init(&card->kref); | |
411 | init_completion(&card->done); | |
412 | INIT_LIST_HEAD(&card->transaction_list); | |
413 | spin_lock_init(&card->lock); | |
414 | setup_timer(&card->flush_timer, | |
415 | flush_timer_callback, (unsigned long)card); | |
416 | ||
417 | card->local_node = NULL; | |
418 | ||
419 | INIT_DELAYED_WORK(&card->work, fw_card_bm_work); | |
420 | } | |
421 | EXPORT_SYMBOL(fw_card_initialize); | |
422 | ||
423 | int | |
424 | fw_card_add(struct fw_card *card, | |
425 | u32 max_receive, u32 link_speed, u64 guid) | |
426 | { | |
427 | u32 *config_rom; | |
428 | size_t length; | |
429 | ||
430 | card->max_receive = max_receive; | |
431 | card->link_speed = link_speed; | |
432 | card->guid = guid; | |
433 | ||
434 | mutex_lock(&card_mutex); | |
435 | config_rom = generate_config_rom(card, &length); | |
436 | list_add_tail(&card->link, &card_list); | |
437 | mutex_unlock(&card_mutex); | |
438 | ||
439 | return card->driver->enable(card, config_rom, length); | |
440 | } | |
441 | EXPORT_SYMBOL(fw_card_add); | |
442 | ||
443 | ||
444 | /* | |
445 | * The next few functions implements a dummy driver that use once a | |
446 | * card driver shuts down an fw_card. This allows the driver to | |
447 | * cleanly unload, as all IO to the card will be handled by the dummy | |
448 | * driver instead of calling into the (possibly) unloaded module. The | |
449 | * dummy driver just fails all IO. | |
450 | */ | |
451 | ||
452 | static int | |
453 | dummy_enable(struct fw_card *card, u32 *config_rom, size_t length) | |
454 | { | |
455 | BUG(); | |
456 | return -1; | |
457 | } | |
458 | ||
459 | static int | |
460 | dummy_update_phy_reg(struct fw_card *card, int address, | |
461 | int clear_bits, int set_bits) | |
462 | { | |
463 | return -ENODEV; | |
464 | } | |
465 | ||
466 | static int | |
467 | dummy_set_config_rom(struct fw_card *card, | |
468 | u32 *config_rom, size_t length) | |
469 | { | |
470 | /* | |
471 | * We take the card out of card_list before setting the dummy | |
472 | * driver, so this should never get called. | |
473 | */ | |
474 | BUG(); | |
475 | return -1; | |
476 | } | |
477 | ||
478 | static void | |
479 | dummy_send_request(struct fw_card *card, struct fw_packet *packet) | |
480 | { | |
481 | packet->callback(packet, card, -ENODEV); | |
482 | } | |
483 | ||
484 | static void | |
485 | dummy_send_response(struct fw_card *card, struct fw_packet *packet) | |
486 | { | |
487 | packet->callback(packet, card, -ENODEV); | |
488 | } | |
489 | ||
490 | static int | |
491 | dummy_cancel_packet(struct fw_card *card, struct fw_packet *packet) | |
492 | { | |
493 | return -ENOENT; | |
494 | } | |
495 | ||
496 | static int | |
497 | dummy_enable_phys_dma(struct fw_card *card, | |
498 | int node_id, int generation) | |
499 | { | |
500 | return -ENODEV; | |
501 | } | |
502 | ||
503 | static struct fw_card_driver dummy_driver = { | |
504 | .enable = dummy_enable, | |
505 | .update_phy_reg = dummy_update_phy_reg, | |
506 | .set_config_rom = dummy_set_config_rom, | |
507 | .send_request = dummy_send_request, | |
508 | .cancel_packet = dummy_cancel_packet, | |
509 | .send_response = dummy_send_response, | |
510 | .enable_phys_dma = dummy_enable_phys_dma, | |
511 | }; | |
512 | ||
513 | void | |
514 | fw_card_release(struct kref *kref) | |
515 | { | |
516 | struct fw_card *card = container_of(kref, struct fw_card, kref); | |
517 | ||
518 | complete(&card->done); | |
519 | } | |
520 | ||
521 | void | |
522 | fw_core_remove_card(struct fw_card *card) | |
523 | { | |
524 | card->driver->update_phy_reg(card, 4, | |
525 | PHY_LINK_ACTIVE | PHY_CONTENDER, 0); | |
526 | fw_core_initiate_bus_reset(card, 1); | |
527 | ||
528 | mutex_lock(&card_mutex); | |
529 | list_del(&card->link); | |
530 | mutex_unlock(&card_mutex); | |
531 | ||
532 | /* Set up the dummy driver. */ | |
533 | card->driver = &dummy_driver; | |
534 | ||
535 | fw_destroy_nodes(card); | |
536 | ||
537 | /* Wait for all users, especially device workqueue jobs, to finish. */ | |
538 | fw_card_put(card); | |
539 | wait_for_completion(&card->done); | |
540 | ||
541 | cancel_delayed_work_sync(&card->work); | |
542 | fw_flush_transactions(card); | |
543 | del_timer_sync(&card->flush_timer); | |
544 | } | |
545 | EXPORT_SYMBOL(fw_core_remove_card); | |
546 | ||
547 | int | |
548 | fw_core_initiate_bus_reset(struct fw_card *card, int short_reset) | |
549 | { | |
550 | int reg = short_reset ? 5 : 1; | |
551 | int bit = short_reset ? PHY_BUS_SHORT_RESET : PHY_BUS_RESET; | |
552 | ||
553 | return card->driver->update_phy_reg(card, reg, 0, bit); | |
554 | } | |
555 | EXPORT_SYMBOL(fw_core_initiate_bus_reset); |