Commit | Line | Data |
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c781c06d KH |
1 | /* |
2 | * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net> | |
3038e353 KH |
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 | ||
459f7923 SR |
19 | #include <linux/completion.h> |
20 | #include <linux/crc-itu-t.h> | |
855c603d | 21 | #include <linux/delay.h> |
3038e353 | 22 | #include <linux/device.h> |
459f7923 SR |
23 | #include <linux/errno.h> |
24 | #include <linux/kref.h> | |
25 | #include <linux/module.h> | |
6a5033be | 26 | #include <linux/mutex.h> |
459f7923 | 27 | |
3038e353 KH |
28 | #include "fw-transaction.h" |
29 | #include "fw-topology.h" | |
19a15b93 | 30 | #include "fw-device.h" |
3038e353 | 31 | |
e175569c | 32 | int fw_compute_block_crc(u32 *block) |
3038e353 | 33 | { |
e175569c KH |
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); | |
3038e353 | 41 | |
e175569c | 42 | return length; |
3038e353 KH |
43 | } |
44 | ||
6a5033be | 45 | static DEFINE_MUTEX(card_mutex); |
3038e353 KH |
46 | static LIST_HEAD(card_list); |
47 | ||
48 | static LIST_HEAD(descriptor_list); | |
49 | static int descriptor_count; | |
50 | ||
a77754a7 KH |
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) | |
3038e353 | 65 | |
53dca511 | 66 | static u32 *generate_config_rom(struct fw_card *card, size_t *config_rom_length) |
3038e353 KH |
67 | { |
68 | struct fw_descriptor *desc; | |
69 | static u32 config_rom[256]; | |
70 | int i, j, length; | |
71 | ||
c781c06d KH |
72 | /* |
73 | * Initialize contents of config rom buffer. On the OHCI | |
5e20c282 SR |
74 | * controller, block reads to the config rom accesses the host |
75 | * memory, but quadlet read access the hardware bus info block | |
76 | * registers. That's just crack, but it means we should make | |
2cc489c2 | 77 | * sure the contents of bus info block in host memory matches |
c781c06d KH |
78 | * the version stored in the OHCI registers. |
79 | */ | |
3038e353 | 80 | |
2d826cc5 | 81 | memset(config_rom, 0, sizeof(config_rom)); |
a77754a7 | 82 | config_rom[0] = BIB_CRC_LENGTH(4) | BIB_INFO_LENGTH(4) | BIB_CRC(0); |
3038e353 KH |
83 | config_rom[1] = 0x31333934; |
84 | ||
85 | config_rom[2] = | |
a77754a7 KH |
86 | BIB_LINK_SPEED(card->link_speed) | |
87 | BIB_GENERATION(card->config_rom_generation++ % 14 + 2) | | |
88 | BIB_MAX_ROM(2) | | |
89 | BIB_MAX_RECEIVE(card->max_receive) | | |
90 | BIB_BMC | BIB_ISC | BIB_CMC | BIB_IMC; | |
3038e353 KH |
91 | config_rom[3] = card->guid >> 32; |
92 | config_rom[4] = card->guid; | |
93 | ||
94 | /* Generate root directory. */ | |
95 | i = 5; | |
96 | config_rom[i++] = 0; | |
97 | config_rom[i++] = 0x0c0083c0; /* node capabilities */ | |
3038e353 KH |
98 | j = i + descriptor_count; |
99 | ||
100 | /* Generate root directory entries for descriptors. */ | |
101 | list_for_each_entry (desc, &descriptor_list, link) { | |
937f6879 KH |
102 | if (desc->immediate > 0) |
103 | config_rom[i++] = desc->immediate; | |
3038e353 KH |
104 | config_rom[i] = desc->key | (j - i); |
105 | i++; | |
106 | j += desc->length; | |
107 | } | |
108 | ||
109 | /* Update root directory length. */ | |
110 | config_rom[5] = (i - 5 - 1) << 16; | |
111 | ||
112 | /* End of root directory, now copy in descriptors. */ | |
113 | list_for_each_entry (desc, &descriptor_list, link) { | |
114 | memcpy(&config_rom[i], desc->data, desc->length * 4); | |
115 | i += desc->length; | |
116 | } | |
117 | ||
118 | /* Calculate CRCs for all blocks in the config rom. This | |
119 | * assumes that CRC length and info length are identical for | |
120 | * the bus info block, which is always the case for this | |
121 | * implementation. */ | |
e175569c KH |
122 | for (i = 0; i < j; i += length + 1) |
123 | length = fw_compute_block_crc(config_rom + i); | |
3038e353 KH |
124 | |
125 | *config_rom_length = j; | |
126 | ||
127 | return config_rom; | |
128 | } | |
129 | ||
53dca511 | 130 | static void update_config_roms(void) |
3038e353 KH |
131 | { |
132 | struct fw_card *card; | |
133 | u32 *config_rom; | |
134 | size_t length; | |
135 | ||
136 | list_for_each_entry (card, &card_list, link) { | |
137 | config_rom = generate_config_rom(card, &length); | |
138 | card->driver->set_config_rom(card, config_rom, length); | |
139 | } | |
140 | } | |
141 | ||
53dca511 | 142 | int fw_core_add_descriptor(struct fw_descriptor *desc) |
3038e353 KH |
143 | { |
144 | size_t i; | |
145 | ||
c781c06d KH |
146 | /* |
147 | * Check descriptor is valid; the length of all blocks in the | |
3038e353 | 148 | * descriptor has to add up to exactly the length of the |
c781c06d KH |
149 | * block. |
150 | */ | |
3038e353 KH |
151 | i = 0; |
152 | while (i < desc->length) | |
153 | i += (desc->data[i] >> 16) + 1; | |
154 | ||
155 | if (i != desc->length) | |
66dea3e5 | 156 | return -EINVAL; |
3038e353 | 157 | |
6a5033be | 158 | mutex_lock(&card_mutex); |
3038e353 | 159 | |
a98e2719 | 160 | list_add_tail(&desc->link, &descriptor_list); |
3038e353 | 161 | descriptor_count++; |
937f6879 KH |
162 | if (desc->immediate > 0) |
163 | descriptor_count++; | |
3038e353 KH |
164 | update_config_roms(); |
165 | ||
6a5033be | 166 | mutex_unlock(&card_mutex); |
3038e353 KH |
167 | |
168 | return 0; | |
169 | } | |
3038e353 | 170 | |
53dca511 | 171 | void fw_core_remove_descriptor(struct fw_descriptor *desc) |
3038e353 | 172 | { |
6a5033be | 173 | mutex_lock(&card_mutex); |
3038e353 KH |
174 | |
175 | list_del(&desc->link); | |
176 | descriptor_count--; | |
937f6879 KH |
177 | if (desc->immediate > 0) |
178 | descriptor_count--; | |
3038e353 KH |
179 | update_config_roms(); |
180 | ||
6a5033be | 181 | mutex_unlock(&card_mutex); |
3038e353 | 182 | } |
3038e353 | 183 | |
6104ee92 JF |
184 | #define IRM_RETRIES 2 |
185 | ||
186 | /* | |
187 | * The abi is set by device_for_each_child(), even though we have no use | |
188 | * for data, nor do we have a meaningful return value. | |
189 | */ | |
190 | int fw_irm_set_broadcast_channel_register(struct device *dev, void *data) | |
191 | { | |
192 | struct fw_device *d; | |
193 | int rcode; | |
194 | int node_id; | |
195 | int max_speed; | |
196 | int retries; | |
197 | int generation; | |
198 | __be32 regval; | |
199 | struct fw_card *card; | |
200 | ||
201 | d = fw_device(dev); | |
202 | /* FIXME: do we need locking here? */ | |
203 | generation = d->generation; | |
204 | smp_rmb(); /* Ensure generation is at least as old as node_id */ | |
205 | node_id = d->node_id; | |
206 | max_speed = d->max_speed; | |
207 | retries = IRM_RETRIES; | |
208 | card = d->card; | |
209 | tryagain_r: | |
210 | rcode = fw_run_transaction(card, TCODE_READ_QUADLET_REQUEST, | |
211 | node_id, generation, max_speed, | |
212 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, | |
213 | ®val, 4); | |
214 | switch (rcode) { | |
215 | case RCODE_BUSY: | |
216 | if (retries--) | |
217 | goto tryagain_r; | |
218 | fw_notify("node %x read broadcast channel busy\n", | |
219 | node_id); | |
220 | return 0; | |
221 | ||
222 | default: | |
223 | fw_notify("node %x read broadcast channel failed %x\n", | |
224 | node_id, rcode); | |
225 | return 0; | |
226 | ||
227 | case RCODE_COMPLETE: | |
228 | /* | |
229 | * Paranoid reporting of nonstandard broadcast channel | |
230 | * contents goes here | |
231 | */ | |
232 | if (regval != cpu_to_be32(BROADCAST_CHANNEL_INITIAL)) | |
233 | return 0; | |
234 | break; | |
235 | } | |
236 | retries = IRM_RETRIES; | |
237 | regval = cpu_to_be32(BROADCAST_CHANNEL_INITIAL | | |
238 | BROADCAST_CHANNEL_VALID); | |
239 | tryagain_w: | |
240 | rcode = fw_run_transaction(card, | |
241 | TCODE_WRITE_QUADLET_REQUEST, node_id, | |
242 | generation, max_speed, | |
243 | CSR_REGISTER_BASE + CSR_BROADCAST_CHANNEL, | |
244 | ®val, 4); | |
245 | switch (rcode) { | |
246 | case RCODE_BUSY: | |
247 | if (retries--) | |
248 | goto tryagain_w; | |
249 | fw_notify("node %x write broadcast channel busy\n", | |
250 | node_id); | |
251 | return 0; | |
252 | ||
253 | default: | |
254 | fw_notify("node %x write broadcast channel failed %x\n", | |
255 | node_id, rcode); | |
256 | return 0; | |
257 | ||
258 | case RCODE_COMPLETE: | |
259 | return 0; | |
260 | } | |
261 | return 0; | |
262 | } | |
263 | ||
cbae787c | 264 | static void allocate_broadcast_channel(struct fw_card *card, int generation) |
6104ee92 | 265 | { |
cbae787c SR |
266 | int channel, bandwidth = 0; |
267 | ||
268 | fw_iso_resource_manage(card, generation, 1ULL << 31, | |
269 | &channel, &bandwidth, true); | |
270 | if (channel == 31) { | |
271 | card->is_irm = true; | |
272 | device_for_each_child(card->device, NULL, | |
273 | fw_irm_set_broadcast_channel_register); | |
6104ee92 | 274 | } |
6104ee92 | 275 | } |
6104ee92 | 276 | |
83db801c KH |
277 | static const char gap_count_table[] = { |
278 | 63, 5, 7, 8, 10, 13, 16, 18, 21, 24, 26, 29, 32, 35, 37, 40 | |
279 | }; | |
280 | ||
53dca511 | 281 | void fw_schedule_bm_work(struct fw_card *card, unsigned long delay) |
0fa1986f JF |
282 | { |
283 | int scheduled; | |
284 | ||
285 | fw_card_get(card); | |
286 | scheduled = schedule_delayed_work(&card->work, delay); | |
287 | if (!scheduled) | |
288 | fw_card_put(card); | |
289 | } | |
290 | ||
53dca511 | 291 | static void fw_card_bm_work(struct work_struct *work) |
19a15b93 | 292 | { |
83db801c | 293 | struct fw_card *card = container_of(work, struct fw_card, work.work); |
cbae787c SR |
294 | struct fw_device *root_device; |
295 | struct fw_node *root_node; | |
19a15b93 | 296 | unsigned long flags; |
cbae787c SR |
297 | int root_id, new_root_id, irm_id, local_id; |
298 | int gap_count, generation, grace, rcode; | |
25b1c3d8 | 299 | bool do_reset = false; |
62305823 SR |
300 | bool root_device_is_running; |
301 | bool root_device_is_cmc; | |
1e119fa9 | 302 | __be32 lock_data[2]; |
19a15b93 KH |
303 | |
304 | spin_lock_irqsave(&card->lock, flags); | |
6104ee92 | 305 | card->is_irm = false; |
15803478 | 306 | |
cbae787c | 307 | if (card->local_node == NULL) { |
15803478 | 308 | spin_unlock_irqrestore(&card->lock, flags); |
0fa1986f | 309 | goto out_put_card; |
15803478 | 310 | } |
19a15b93 KH |
311 | |
312 | generation = card->generation; | |
cbae787c SR |
313 | root_node = card->root_node; |
314 | fw_node_get(root_node); | |
15803478 | 315 | root_device = root_node->data; |
62305823 SR |
316 | root_device_is_running = root_device && |
317 | atomic_read(&root_device->state) == FW_DEVICE_RUNNING; | |
318 | root_device_is_cmc = root_device && root_device->cmc; | |
cbae787c SR |
319 | root_id = root_node->node_id; |
320 | irm_id = card->irm_node->node_id; | |
321 | local_id = card->local_node->node_id; | |
e1dc7cab SR |
322 | |
323 | grace = time_after(jiffies, card->reset_jiffies + DIV_ROUND_UP(HZ, 8)); | |
324 | ||
8cd0bbbd | 325 | if (is_next_generation(generation, card->bm_generation) || |
931c4834 | 326 | (card->bm_generation != generation && grace)) { |
c781c06d KH |
327 | /* |
328 | * This first step is to figure out who is IRM and | |
931c4834 KH |
329 | * then try to become bus manager. If the IRM is not |
330 | * well defined (e.g. does not have an active link | |
331 | * layer or does not responds to our lock request, we | |
332 | * will have to do a little vigilante bus management. | |
333 | * In that case, we do a goto into the gap count logic | |
334 | * so that when we do the reset, we still optimize the | |
335 | * gap count. That could well save a reset in the | |
c781c06d KH |
336 | * next generation. |
337 | */ | |
931c4834 | 338 | |
cbae787c SR |
339 | if (!card->irm_node->link_on) { |
340 | new_root_id = local_id; | |
931c4834 KH |
341 | fw_notify("IRM has link off, making local node (%02x) root.\n", |
342 | new_root_id); | |
343 | goto pick_me; | |
344 | } | |
345 | ||
1e119fa9 | 346 | lock_data[0] = cpu_to_be32(0x3f); |
cbae787c | 347 | lock_data[1] = cpu_to_be32(local_id); |
931c4834 KH |
348 | |
349 | spin_unlock_irqrestore(&card->lock, flags); | |
350 | ||
1e119fa9 JF |
351 | rcode = fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP, |
352 | irm_id, generation, SCODE_100, | |
353 | CSR_REGISTER_BASE + CSR_BUS_MANAGER_ID, | |
354 | lock_data, sizeof(lock_data)); | |
931c4834 | 355 | |
1e119fa9 JF |
356 | if (rcode == RCODE_GENERATION) |
357 | /* Another bus reset, BM work has been rescheduled. */ | |
15803478 | 358 | goto out; |
931c4834 | 359 | |
1e119fa9 | 360 | if (rcode == RCODE_COMPLETE && |
6104ee92 | 361 | lock_data[0] != cpu_to_be32(0x3f)) { |
cbae787c SR |
362 | |
363 | /* Somebody else is BM. Only act as IRM. */ | |
364 | if (local_id == irm_id) | |
365 | allocate_broadcast_channel(card, generation); | |
366 | ||
15803478 | 367 | goto out; |
6104ee92 | 368 | } |
931c4834 KH |
369 | |
370 | spin_lock_irqsave(&card->lock, flags); | |
1e119fa9 JF |
371 | |
372 | if (rcode != RCODE_COMPLETE) { | |
c781c06d KH |
373 | /* |
374 | * The lock request failed, maybe the IRM | |
931c4834 KH |
375 | * isn't really IRM capable after all. Let's |
376 | * do a bus reset and pick the local node as | |
c781c06d KH |
377 | * root, and thus, IRM. |
378 | */ | |
cbae787c | 379 | new_root_id = local_id; |
931c4834 KH |
380 | fw_notify("BM lock failed, making local node (%02x) root.\n", |
381 | new_root_id); | |
382 | goto pick_me; | |
383 | } | |
384 | } else if (card->bm_generation != generation) { | |
c781c06d | 385 | /* |
e1dc7cab SR |
386 | * We weren't BM in the last generation, and the last |
387 | * bus reset is less than 125ms ago. Reschedule this job. | |
c781c06d | 388 | */ |
931c4834 | 389 | spin_unlock_irqrestore(&card->lock, flags); |
e1dc7cab | 390 | fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 8)); |
15803478 | 391 | goto out; |
931c4834 KH |
392 | } |
393 | ||
c781c06d KH |
394 | /* |
395 | * We're bus manager for this generation, so next step is to | |
931c4834 | 396 | * make sure we have an active cycle master and do gap count |
c781c06d KH |
397 | * optimization. |
398 | */ | |
931c4834 | 399 | card->bm_generation = generation; |
19a15b93 | 400 | |
15803478 | 401 | if (root_device == NULL) { |
c781c06d KH |
402 | /* |
403 | * Either link_on is false, or we failed to read the | |
404 | * config rom. In either case, pick another root. | |
405 | */ | |
cbae787c | 406 | new_root_id = local_id; |
62305823 | 407 | } else if (!root_device_is_running) { |
c781c06d KH |
408 | /* |
409 | * If we haven't probed this device yet, bail out now | |
410 | * and let's try again once that's done. | |
411 | */ | |
931c4834 | 412 | spin_unlock_irqrestore(&card->lock, flags); |
15803478 | 413 | goto out; |
62305823 | 414 | } else if (root_device_is_cmc) { |
c781c06d KH |
415 | /* |
416 | * FIXME: I suppose we should set the cmstr bit in the | |
19a15b93 KH |
417 | * STATE_CLEAR register of this node, as described in |
418 | * 1394-1995, 8.4.2.6. Also, send out a force root | |
c781c06d KH |
419 | * packet for this node. |
420 | */ | |
931c4834 | 421 | new_root_id = root_id; |
83db801c | 422 | } else { |
c781c06d KH |
423 | /* |
424 | * Current root has an active link layer and we | |
19a15b93 | 425 | * successfully read the config rom, but it's not |
c781c06d KH |
426 | * cycle master capable. |
427 | */ | |
cbae787c | 428 | new_root_id = local_id; |
83db801c KH |
429 | } |
430 | ||
931c4834 | 431 | pick_me: |
24d40125 SR |
432 | /* |
433 | * Pick a gap count from 1394a table E-1. The table doesn't cover | |
434 | * the typically much larger 1394b beta repeater delays though. | |
435 | */ | |
436 | if (!card->beta_repeaters_present && | |
15803478 SR |
437 | root_node->max_hops < ARRAY_SIZE(gap_count_table)) |
438 | gap_count = gap_count_table[root_node->max_hops]; | |
83db801c KH |
439 | else |
440 | gap_count = 63; | |
441 | ||
c781c06d | 442 | /* |
25b1c3d8 SR |
443 | * Finally, figure out if we should do a reset or not. If we have |
444 | * done less than 5 resets with the same physical topology and we | |
c781c06d KH |
445 | * have either a new root or a new gap count setting, let's do it. |
446 | */ | |
19a15b93 | 447 | |
931c4834 KH |
448 | if (card->bm_retries++ < 5 && |
449 | (card->gap_count != gap_count || new_root_id != root_id)) | |
25b1c3d8 | 450 | do_reset = true; |
19a15b93 KH |
451 | |
452 | spin_unlock_irqrestore(&card->lock, flags); | |
453 | ||
83db801c KH |
454 | if (do_reset) { |
455 | fw_notify("phy config: card %d, new root=%x, gap_count=%d\n", | |
931c4834 KH |
456 | card->index, new_root_id, gap_count); |
457 | fw_send_phy_config(card, new_root_id, generation, gap_count); | |
19a15b93 | 458 | fw_core_initiate_bus_reset(card, 1); |
cbae787c SR |
459 | /* Will allocate broadcast channel after the reset. */ |
460 | } else { | |
461 | if (local_id == irm_id) | |
462 | allocate_broadcast_channel(card, generation); | |
19a15b93 | 463 | } |
6104ee92 | 464 | |
15803478 | 465 | out: |
15803478 | 466 | fw_node_put(root_node); |
0fa1986f JF |
467 | out_put_card: |
468 | fw_card_put(card); | |
19a15b93 KH |
469 | } |
470 | ||
53dca511 | 471 | static void flush_timer_callback(unsigned long data) |
3038e353 KH |
472 | { |
473 | struct fw_card *card = (struct fw_card *)data; | |
474 | ||
475 | fw_flush_transactions(card); | |
476 | } | |
477 | ||
53dca511 SR |
478 | void fw_card_initialize(struct fw_card *card, |
479 | const struct fw_card_driver *driver, | |
480 | struct device *device) | |
3038e353 | 481 | { |
bbf19db3 | 482 | static atomic_t index = ATOMIC_INIT(-1); |
3038e353 | 483 | |
bbf19db3 | 484 | card->index = atomic_inc_return(&index); |
5e20c282 | 485 | card->driver = driver; |
3038e353 | 486 | card->device = device; |
5e20c282 SR |
487 | card->current_tlabel = 0; |
488 | card->tlabel_mask = 0; | |
3038e353 | 489 | card->color = 0; |
e534fe16 | 490 | card->broadcast_channel = BROADCAST_CHANNEL_INITIAL; |
3038e353 | 491 | |
459f7923 SR |
492 | kref_init(&card->kref); |
493 | init_completion(&card->done); | |
5e20c282 | 494 | INIT_LIST_HEAD(&card->transaction_list); |
3038e353 KH |
495 | spin_lock_init(&card->lock); |
496 | setup_timer(&card->flush_timer, | |
497 | flush_timer_callback, (unsigned long)card); | |
498 | ||
499 | card->local_node = NULL; | |
500 | ||
931c4834 | 501 | INIT_DELAYED_WORK(&card->work, fw_card_bm_work); |
3038e353 KH |
502 | } |
503 | EXPORT_SYMBOL(fw_card_initialize); | |
504 | ||
53dca511 SR |
505 | int fw_card_add(struct fw_card *card, |
506 | u32 max_receive, u32 link_speed, u64 guid) | |
3038e353 | 507 | { |
3038e353 KH |
508 | u32 *config_rom; |
509 | size_t length; | |
e1eff7a3 | 510 | int ret; |
3038e353 KH |
511 | |
512 | card->max_receive = max_receive; | |
513 | card->link_speed = link_speed; | |
514 | card->guid = guid; | |
515 | ||
6a5033be | 516 | mutex_lock(&card_mutex); |
a98e2719 | 517 | config_rom = generate_config_rom(card, &length); |
3038e353 | 518 | list_add_tail(&card->link, &card_list); |
6a5033be | 519 | mutex_unlock(&card_mutex); |
3038e353 | 520 | |
e1eff7a3 SR |
521 | ret = card->driver->enable(card, config_rom, length); |
522 | if (ret < 0) { | |
b7479feb PV |
523 | mutex_lock(&card_mutex); |
524 | list_del(&card->link); | |
525 | mutex_unlock(&card_mutex); | |
526 | } | |
e1eff7a3 SR |
527 | |
528 | return ret; | |
3038e353 KH |
529 | } |
530 | EXPORT_SYMBOL(fw_card_add); | |
531 | ||
532 | ||
c781c06d KH |
533 | /* |
534 | * The next few functions implements a dummy driver that use once a | |
3038e353 KH |
535 | * card driver shuts down an fw_card. This allows the driver to |
536 | * cleanly unload, as all IO to the card will be handled by the dummy | |
537 | * driver instead of calling into the (possibly) unloaded module. The | |
c781c06d KH |
538 | * dummy driver just fails all IO. |
539 | */ | |
3038e353 | 540 | |
53dca511 | 541 | static int dummy_enable(struct fw_card *card, u32 *config_rom, size_t length) |
3038e353 KH |
542 | { |
543 | BUG(); | |
544 | return -1; | |
545 | } | |
546 | ||
53dca511 SR |
547 | static int dummy_update_phy_reg(struct fw_card *card, int address, |
548 | int clear_bits, int set_bits) | |
3038e353 KH |
549 | { |
550 | return -ENODEV; | |
551 | } | |
552 | ||
53dca511 SR |
553 | static int dummy_set_config_rom(struct fw_card *card, |
554 | u32 *config_rom, size_t length) | |
3038e353 | 555 | { |
c781c06d KH |
556 | /* |
557 | * We take the card out of card_list before setting the dummy | |
558 | * driver, so this should never get called. | |
559 | */ | |
3038e353 KH |
560 | BUG(); |
561 | return -1; | |
562 | } | |
563 | ||
53dca511 | 564 | static void dummy_send_request(struct fw_card *card, struct fw_packet *packet) |
3038e353 | 565 | { |
5e20c282 | 566 | packet->callback(packet, card, -ENODEV); |
3038e353 KH |
567 | } |
568 | ||
53dca511 | 569 | static void dummy_send_response(struct fw_card *card, struct fw_packet *packet) |
3038e353 | 570 | { |
5e20c282 | 571 | packet->callback(packet, card, -ENODEV); |
3038e353 KH |
572 | } |
573 | ||
53dca511 | 574 | static int dummy_cancel_packet(struct fw_card *card, struct fw_packet *packet) |
730c32f5 KH |
575 | { |
576 | return -ENOENT; | |
577 | } | |
578 | ||
53dca511 SR |
579 | static int dummy_enable_phys_dma(struct fw_card *card, |
580 | int node_id, int generation) | |
3038e353 KH |
581 | { |
582 | return -ENODEV; | |
583 | } | |
584 | ||
585 | static struct fw_card_driver dummy_driver = { | |
3038e353 KH |
586 | .enable = dummy_enable, |
587 | .update_phy_reg = dummy_update_phy_reg, | |
588 | .set_config_rom = dummy_set_config_rom, | |
5e20c282 | 589 | .send_request = dummy_send_request, |
730c32f5 | 590 | .cancel_packet = dummy_cancel_packet, |
5e20c282 | 591 | .send_response = dummy_send_response, |
5af4e5ea | 592 | .enable_phys_dma = dummy_enable_phys_dma, |
3038e353 KH |
593 | }; |
594 | ||
53dca511 | 595 | void fw_card_release(struct kref *kref) |
459f7923 SR |
596 | { |
597 | struct fw_card *card = container_of(kref, struct fw_card, kref); | |
598 | ||
599 | complete(&card->done); | |
600 | } | |
601 | ||
53dca511 | 602 | void fw_core_remove_card(struct fw_card *card) |
3038e353 | 603 | { |
ecab4133 MB |
604 | card->driver->update_phy_reg(card, 4, |
605 | PHY_LINK_ACTIVE | PHY_CONTENDER, 0); | |
3038e353 KH |
606 | fw_core_initiate_bus_reset(card, 1); |
607 | ||
6a5033be | 608 | mutex_lock(&card_mutex); |
e747a5c0 | 609 | list_del_init(&card->link); |
6a5033be | 610 | mutex_unlock(&card_mutex); |
3038e353 KH |
611 | |
612 | /* Set up the dummy driver. */ | |
613 | card->driver = &dummy_driver; | |
614 | ||
3038e353 | 615 | fw_destroy_nodes(card); |
459f7923 SR |
616 | |
617 | /* Wait for all users, especially device workqueue jobs, to finish. */ | |
618 | fw_card_put(card); | |
619 | wait_for_completion(&card->done); | |
8a2d9ed3 | 620 | |
1e8afea1 | 621 | WARN_ON(!list_empty(&card->transaction_list)); |
8a2d9ed3 | 622 | del_timer_sync(&card->flush_timer); |
3038e353 KH |
623 | } |
624 | EXPORT_SYMBOL(fw_core_remove_card); | |
625 | ||
53dca511 | 626 | int fw_core_initiate_bus_reset(struct fw_card *card, int short_reset) |
3038e353 | 627 | { |
ecab4133 | 628 | int reg = short_reset ? 5 : 1; |
ecab4133 MB |
629 | int bit = short_reset ? PHY_BUS_SHORT_RESET : PHY_BUS_RESET; |
630 | ||
631 | return card->driver->update_phy_reg(card, reg, 0, bit); | |
3038e353 KH |
632 | } |
633 | EXPORT_SYMBOL(fw_core_initiate_bus_reset); |