Commit | Line | Data |
---|---|---|
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 | ||
e8ca9702 | 19 | #include <linux/bug.h> |
459f7923 SR |
20 | #include <linux/completion.h> |
21 | #include <linux/crc-itu-t.h> | |
3038e353 | 22 | #include <linux/device.h> |
459f7923 | 23 | #include <linux/errno.h> |
77c9a5da SR |
24 | #include <linux/firewire.h> |
25 | #include <linux/firewire-constants.h> | |
e8ca9702 SR |
26 | #include <linux/jiffies.h> |
27 | #include <linux/kernel.h> | |
459f7923 | 28 | #include <linux/kref.h> |
e8ca9702 | 29 | #include <linux/list.h> |
459f7923 | 30 | #include <linux/module.h> |
6a5033be | 31 | #include <linux/mutex.h> |
e8ca9702 | 32 | #include <linux/spinlock.h> |
e8ca9702 SR |
33 | #include <linux/workqueue.h> |
34 | ||
35 | #include <asm/atomic.h> | |
36 | #include <asm/byteorder.h> | |
459f7923 | 37 | |
77c9a5da | 38 | #include "core.h" |
3038e353 | 39 | |
cb7c96da | 40 | int fw_compute_block_crc(__be32 *block) |
8e85973e SR |
41 | { |
42 | int length; | |
43 | u16 crc; | |
44 | ||
45 | length = (be32_to_cpu(block[0]) >> 16) & 0xff; | |
46 | crc = crc_itu_t(0, (u8 *)&block[1], length * 4); | |
47 | *block |= cpu_to_be32(crc); | |
48 | ||
49 | return length; | |
50 | } | |
51 | ||
6a5033be | 52 | static DEFINE_MUTEX(card_mutex); |
3038e353 KH |
53 | static LIST_HEAD(card_list); |
54 | ||
55 | static LIST_HEAD(descriptor_list); | |
56 | static int descriptor_count; | |
57 | ||
fe242579 | 58 | static __be32 tmp_config_rom[256]; |
e300839d SR |
59 | /* ROM header, bus info block, root dir header, capabilities = 7 quadlets */ |
60 | static size_t config_rom_length = 1 + 4 + 1 + 1; | |
fe242579 | 61 | |
a77754a7 KH |
62 | #define BIB_CRC(v) ((v) << 0) |
63 | #define BIB_CRC_LENGTH(v) ((v) << 16) | |
64 | #define BIB_INFO_LENGTH(v) ((v) << 24) | |
edd5bdaf | 65 | #define BIB_BUS_NAME 0x31333934 /* "1394" */ |
a77754a7 KH |
66 | #define BIB_LINK_SPEED(v) ((v) << 0) |
67 | #define BIB_GENERATION(v) ((v) << 4) | |
68 | #define BIB_MAX_ROM(v) ((v) << 8) | |
69 | #define BIB_MAX_RECEIVE(v) ((v) << 12) | |
70 | #define BIB_CYC_CLK_ACC(v) ((v) << 16) | |
71 | #define BIB_PMC ((1) << 27) | |
72 | #define BIB_BMC ((1) << 28) | |
73 | #define BIB_ISC ((1) << 29) | |
74 | #define BIB_CMC ((1) << 30) | |
edd5bdaf SR |
75 | #define BIB_IRMC ((1) << 31) |
76 | #define NODE_CAPABILITIES 0x0c0083c0 /* per IEEE 1394 clause 8.3.2.6.5.2 */ | |
3038e353 | 77 | |
e300839d | 78 | static void generate_config_rom(struct fw_card *card, __be32 *config_rom) |
3038e353 KH |
79 | { |
80 | struct fw_descriptor *desc; | |
8e85973e | 81 | int i, j, k, length; |
3038e353 | 82 | |
c781c06d KH |
83 | /* |
84 | * Initialize contents of config rom buffer. On the OHCI | |
5e20c282 SR |
85 | * controller, block reads to the config rom accesses the host |
86 | * memory, but quadlet read access the hardware bus info block | |
87 | * registers. That's just crack, but it means we should make | |
2cc489c2 | 88 | * sure the contents of bus info block in host memory matches |
c781c06d KH |
89 | * the version stored in the OHCI registers. |
90 | */ | |
3038e353 | 91 | |
8e85973e SR |
92 | config_rom[0] = cpu_to_be32( |
93 | BIB_CRC_LENGTH(4) | BIB_INFO_LENGTH(4) | BIB_CRC(0)); | |
edd5bdaf | 94 | config_rom[1] = cpu_to_be32(BIB_BUS_NAME); |
8e85973e | 95 | config_rom[2] = cpu_to_be32( |
a77754a7 KH |
96 | BIB_LINK_SPEED(card->link_speed) | |
97 | BIB_GENERATION(card->config_rom_generation++ % 14 + 2) | | |
98 | BIB_MAX_ROM(2) | | |
99 | BIB_MAX_RECEIVE(card->max_receive) | | |
edd5bdaf | 100 | BIB_BMC | BIB_ISC | BIB_CMC | BIB_IRMC); |
8e85973e SR |
101 | config_rom[3] = cpu_to_be32(card->guid >> 32); |
102 | config_rom[4] = cpu_to_be32(card->guid); | |
3038e353 KH |
103 | |
104 | /* Generate root directory. */ | |
edd5bdaf | 105 | config_rom[6] = cpu_to_be32(NODE_CAPABILITIES); |
8e85973e SR |
106 | i = 7; |
107 | j = 7 + descriptor_count; | |
3038e353 KH |
108 | |
109 | /* Generate root directory entries for descriptors. */ | |
110 | list_for_each_entry (desc, &descriptor_list, link) { | |
937f6879 | 111 | if (desc->immediate > 0) |
8e85973e SR |
112 | config_rom[i++] = cpu_to_be32(desc->immediate); |
113 | config_rom[i] = cpu_to_be32(desc->key | (j - i)); | |
3038e353 KH |
114 | i++; |
115 | j += desc->length; | |
116 | } | |
117 | ||
118 | /* Update root directory length. */ | |
8e85973e | 119 | config_rom[5] = cpu_to_be32((i - 5 - 1) << 16); |
3038e353 KH |
120 | |
121 | /* End of root directory, now copy in descriptors. */ | |
122 | list_for_each_entry (desc, &descriptor_list, link) { | |
8e85973e SR |
123 | for (k = 0; k < desc->length; k++) |
124 | config_rom[i + k] = cpu_to_be32(desc->data[k]); | |
3038e353 KH |
125 | i += desc->length; |
126 | } | |
127 | ||
128 | /* Calculate CRCs for all blocks in the config rom. This | |
129 | * assumes that CRC length and info length are identical for | |
130 | * the bus info block, which is always the case for this | |
131 | * implementation. */ | |
e175569c | 132 | for (i = 0; i < j; i += length + 1) |
cb7c96da | 133 | length = fw_compute_block_crc(config_rom + i); |
3038e353 | 134 | |
e300839d | 135 | WARN_ON(j != config_rom_length); |
3038e353 KH |
136 | } |
137 | ||
53dca511 | 138 | static void update_config_roms(void) |
3038e353 KH |
139 | { |
140 | struct fw_card *card; | |
3038e353 KH |
141 | |
142 | list_for_each_entry (card, &card_list, link) { | |
e300839d SR |
143 | generate_config_rom(card, tmp_config_rom); |
144 | card->driver->set_config_rom(card, tmp_config_rom, | |
145 | config_rom_length); | |
3038e353 KH |
146 | } |
147 | } | |
148 | ||
e300839d SR |
149 | static size_t required_space(struct fw_descriptor *desc) |
150 | { | |
151 | /* descriptor + entry into root dir + optional immediate entry */ | |
152 | return desc->length + 1 + (desc->immediate > 0 ? 1 : 0); | |
153 | } | |
154 | ||
53dca511 | 155 | int fw_core_add_descriptor(struct fw_descriptor *desc) |
3038e353 KH |
156 | { |
157 | size_t i; | |
e300839d | 158 | int ret; |
3038e353 | 159 | |
c781c06d KH |
160 | /* |
161 | * Check descriptor is valid; the length of all blocks in the | |
3038e353 | 162 | * descriptor has to add up to exactly the length of the |
c781c06d KH |
163 | * block. |
164 | */ | |
3038e353 KH |
165 | i = 0; |
166 | while (i < desc->length) | |
167 | i += (desc->data[i] >> 16) + 1; | |
168 | ||
169 | if (i != desc->length) | |
66dea3e5 | 170 | return -EINVAL; |
3038e353 | 171 | |
6a5033be | 172 | mutex_lock(&card_mutex); |
3038e353 | 173 | |
e300839d SR |
174 | if (config_rom_length + required_space(desc) > 256) { |
175 | ret = -EBUSY; | |
176 | } else { | |
177 | list_add_tail(&desc->link, &descriptor_list); | |
178 | config_rom_length += required_space(desc); | |
937f6879 | 179 | descriptor_count++; |
e300839d SR |
180 | if (desc->immediate > 0) |
181 | descriptor_count++; | |
182 | update_config_roms(); | |
183 | ret = 0; | |
184 | } | |
3038e353 | 185 | |
6a5033be | 186 | mutex_unlock(&card_mutex); |
3038e353 | 187 | |
e300839d | 188 | return ret; |
3038e353 | 189 | } |
c76acec6 | 190 | EXPORT_SYMBOL(fw_core_add_descriptor); |
3038e353 | 191 | |
53dca511 | 192 | void fw_core_remove_descriptor(struct fw_descriptor *desc) |
3038e353 | 193 | { |
6a5033be | 194 | mutex_lock(&card_mutex); |
3038e353 KH |
195 | |
196 | list_del(&desc->link); | |
e300839d | 197 | config_rom_length -= required_space(desc); |
3038e353 | 198 | descriptor_count--; |
937f6879 KH |
199 | if (desc->immediate > 0) |
200 | descriptor_count--; | |
3038e353 KH |
201 | update_config_roms(); |
202 | ||
6a5033be | 203 | mutex_unlock(&card_mutex); |
3038e353 | 204 | } |
c76acec6 | 205 | EXPORT_SYMBOL(fw_core_remove_descriptor); |
3038e353 | 206 | |
cbae787c | 207 | static void allocate_broadcast_channel(struct fw_card *card, int generation) |
6104ee92 | 208 | { |
cbae787c SR |
209 | int channel, bandwidth = 0; |
210 | ||
e91b2787 CL |
211 | if (!card->broadcast_channel_allocated) { |
212 | fw_iso_resource_manage(card, generation, 1ULL << 31, | |
213 | &channel, &bandwidth, true, | |
214 | card->bm_transaction_data); | |
215 | if (channel != 31) { | |
216 | fw_notify("failed to allocate broadcast channel\n"); | |
217 | return; | |
218 | } | |
7889b60e | 219 | card->broadcast_channel_allocated = true; |
6104ee92 | 220 | } |
e91b2787 CL |
221 | |
222 | device_for_each_child(card->device, (void *)(long)generation, | |
223 | fw_device_set_broadcast_channel); | |
6104ee92 | 224 | } |
6104ee92 | 225 | |
83db801c KH |
226 | static const char gap_count_table[] = { |
227 | 63, 5, 7, 8, 10, 13, 16, 18, 21, 24, 26, 29, 32, 35, 37, 40 | |
228 | }; | |
229 | ||
53dca511 | 230 | void fw_schedule_bm_work(struct fw_card *card, unsigned long delay) |
0fa1986f | 231 | { |
0fa1986f | 232 | fw_card_get(card); |
9fb551bf | 233 | if (!schedule_delayed_work(&card->work, delay)) |
0fa1986f JF |
234 | fw_card_put(card); |
235 | } | |
236 | ||
53dca511 | 237 | static void fw_card_bm_work(struct work_struct *work) |
19a15b93 | 238 | { |
83db801c | 239 | struct fw_card *card = container_of(work, struct fw_card, work.work); |
cbae787c SR |
240 | struct fw_device *root_device; |
241 | struct fw_node *root_node; | |
19a15b93 | 242 | unsigned long flags; |
cbae787c SR |
243 | int root_id, new_root_id, irm_id, local_id; |
244 | int gap_count, generation, grace, rcode; | |
25b1c3d8 | 245 | bool do_reset = false; |
62305823 SR |
246 | bool root_device_is_running; |
247 | bool root_device_is_cmc; | |
19a15b93 KH |
248 | |
249 | spin_lock_irqsave(&card->lock, flags); | |
15803478 | 250 | |
cbae787c | 251 | if (card->local_node == NULL) { |
15803478 | 252 | spin_unlock_irqrestore(&card->lock, flags); |
0fa1986f | 253 | goto out_put_card; |
15803478 | 254 | } |
19a15b93 KH |
255 | |
256 | generation = card->generation; | |
cbae787c SR |
257 | root_node = card->root_node; |
258 | fw_node_get(root_node); | |
15803478 | 259 | root_device = root_node->data; |
62305823 SR |
260 | root_device_is_running = root_device && |
261 | atomic_read(&root_device->state) == FW_DEVICE_RUNNING; | |
262 | root_device_is_cmc = root_device && root_device->cmc; | |
cbae787c SR |
263 | root_id = root_node->node_id; |
264 | irm_id = card->irm_node->node_id; | |
265 | local_id = card->local_node->node_id; | |
e1dc7cab SR |
266 | |
267 | grace = time_after(jiffies, card->reset_jiffies + DIV_ROUND_UP(HZ, 8)); | |
268 | ||
7e0e314f CL |
269 | if ((is_next_generation(generation, card->bm_generation) && |
270 | !card->bm_abdicate) || | |
931c4834 | 271 | (card->bm_generation != generation && grace)) { |
c781c06d KH |
272 | /* |
273 | * This first step is to figure out who is IRM and | |
931c4834 KH |
274 | * then try to become bus manager. If the IRM is not |
275 | * well defined (e.g. does not have an active link | |
276 | * layer or does not responds to our lock request, we | |
277 | * will have to do a little vigilante bus management. | |
278 | * In that case, we do a goto into the gap count logic | |
279 | * so that when we do the reset, we still optimize the | |
280 | * gap count. That could well save a reset in the | |
c781c06d KH |
281 | * next generation. |
282 | */ | |
931c4834 | 283 | |
cbae787c SR |
284 | if (!card->irm_node->link_on) { |
285 | new_root_id = local_id; | |
931c4834 KH |
286 | fw_notify("IRM has link off, making local node (%02x) root.\n", |
287 | new_root_id); | |
288 | goto pick_me; | |
289 | } | |
290 | ||
6fdc0370 SR |
291 | card->bm_transaction_data[0] = cpu_to_be32(0x3f); |
292 | card->bm_transaction_data[1] = cpu_to_be32(local_id); | |
931c4834 KH |
293 | |
294 | spin_unlock_irqrestore(&card->lock, flags); | |
295 | ||
1e119fa9 JF |
296 | rcode = fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP, |
297 | irm_id, generation, SCODE_100, | |
298 | CSR_REGISTER_BASE + CSR_BUS_MANAGER_ID, | |
6fdc0370 SR |
299 | card->bm_transaction_data, |
300 | sizeof(card->bm_transaction_data)); | |
931c4834 | 301 | |
1e119fa9 JF |
302 | if (rcode == RCODE_GENERATION) |
303 | /* Another bus reset, BM work has been rescheduled. */ | |
15803478 | 304 | goto out; |
931c4834 | 305 | |
1e119fa9 | 306 | if (rcode == RCODE_COMPLETE && |
6fdc0370 | 307 | card->bm_transaction_data[0] != cpu_to_be32(0x3f)) { |
cbae787c SR |
308 | |
309 | /* Somebody else is BM. Only act as IRM. */ | |
310 | if (local_id == irm_id) | |
311 | allocate_broadcast_channel(card, generation); | |
312 | ||
15803478 | 313 | goto out; |
6104ee92 | 314 | } |
931c4834 | 315 | |
bda3b8a1 CL |
316 | if (rcode == RCODE_SEND_ERROR) { |
317 | /* | |
318 | * We have been unable to send the lock request due to | |
319 | * some local problem. Let's try again later and hope | |
320 | * that the problem has gone away by then. | |
321 | */ | |
322 | fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 8)); | |
323 | goto out; | |
324 | } | |
325 | ||
931c4834 | 326 | spin_lock_irqsave(&card->lock, flags); |
1e119fa9 JF |
327 | |
328 | if (rcode != RCODE_COMPLETE) { | |
c781c06d KH |
329 | /* |
330 | * The lock request failed, maybe the IRM | |
931c4834 KH |
331 | * isn't really IRM capable after all. Let's |
332 | * do a bus reset and pick the local node as | |
c781c06d KH |
333 | * root, and thus, IRM. |
334 | */ | |
cbae787c | 335 | new_root_id = local_id; |
931c4834 KH |
336 | fw_notify("BM lock failed, making local node (%02x) root.\n", |
337 | new_root_id); | |
338 | goto pick_me; | |
339 | } | |
340 | } else if (card->bm_generation != generation) { | |
c781c06d | 341 | /* |
e1dc7cab SR |
342 | * We weren't BM in the last generation, and the last |
343 | * bus reset is less than 125ms ago. Reschedule this job. | |
c781c06d | 344 | */ |
931c4834 | 345 | spin_unlock_irqrestore(&card->lock, flags); |
e1dc7cab | 346 | fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 8)); |
15803478 | 347 | goto out; |
931c4834 KH |
348 | } |
349 | ||
c781c06d KH |
350 | /* |
351 | * We're bus manager for this generation, so next step is to | |
931c4834 | 352 | * make sure we have an active cycle master and do gap count |
c781c06d KH |
353 | * optimization. |
354 | */ | |
931c4834 | 355 | card->bm_generation = generation; |
19a15b93 | 356 | |
15803478 | 357 | if (root_device == NULL) { |
c781c06d KH |
358 | /* |
359 | * Either link_on is false, or we failed to read the | |
360 | * config rom. In either case, pick another root. | |
361 | */ | |
cbae787c | 362 | new_root_id = local_id; |
62305823 | 363 | } else if (!root_device_is_running) { |
c781c06d KH |
364 | /* |
365 | * If we haven't probed this device yet, bail out now | |
366 | * and let's try again once that's done. | |
367 | */ | |
931c4834 | 368 | spin_unlock_irqrestore(&card->lock, flags); |
15803478 | 369 | goto out; |
62305823 | 370 | } else if (root_device_is_cmc) { |
c781c06d KH |
371 | /* |
372 | * FIXME: I suppose we should set the cmstr bit in the | |
19a15b93 KH |
373 | * STATE_CLEAR register of this node, as described in |
374 | * 1394-1995, 8.4.2.6. Also, send out a force root | |
c781c06d KH |
375 | * packet for this node. |
376 | */ | |
931c4834 | 377 | new_root_id = root_id; |
83db801c | 378 | } else { |
c781c06d KH |
379 | /* |
380 | * Current root has an active link layer and we | |
19a15b93 | 381 | * successfully read the config rom, but it's not |
c781c06d KH |
382 | * cycle master capable. |
383 | */ | |
cbae787c | 384 | new_root_id = local_id; |
83db801c KH |
385 | } |
386 | ||
931c4834 | 387 | pick_me: |
24d40125 SR |
388 | /* |
389 | * Pick a gap count from 1394a table E-1. The table doesn't cover | |
390 | * the typically much larger 1394b beta repeater delays though. | |
391 | */ | |
392 | if (!card->beta_repeaters_present && | |
15803478 SR |
393 | root_node->max_hops < ARRAY_SIZE(gap_count_table)) |
394 | gap_count = gap_count_table[root_node->max_hops]; | |
83db801c KH |
395 | else |
396 | gap_count = 63; | |
397 | ||
c781c06d | 398 | /* |
25b1c3d8 SR |
399 | * Finally, figure out if we should do a reset or not. If we have |
400 | * done less than 5 resets with the same physical topology and we | |
c781c06d KH |
401 | * have either a new root or a new gap count setting, let's do it. |
402 | */ | |
19a15b93 | 403 | |
931c4834 KH |
404 | if (card->bm_retries++ < 5 && |
405 | (card->gap_count != gap_count || new_root_id != root_id)) | |
25b1c3d8 | 406 | do_reset = true; |
19a15b93 KH |
407 | |
408 | spin_unlock_irqrestore(&card->lock, flags); | |
409 | ||
83db801c KH |
410 | if (do_reset) { |
411 | fw_notify("phy config: card %d, new root=%x, gap_count=%d\n", | |
931c4834 KH |
412 | card->index, new_root_id, gap_count); |
413 | fw_send_phy_config(card, new_root_id, generation, gap_count); | |
19a15b93 | 414 | fw_core_initiate_bus_reset(card, 1); |
cbae787c SR |
415 | /* Will allocate broadcast channel after the reset. */ |
416 | } else { | |
417 | if (local_id == irm_id) | |
418 | allocate_broadcast_channel(card, generation); | |
19a15b93 | 419 | } |
6104ee92 | 420 | |
15803478 | 421 | out: |
15803478 | 422 | fw_node_put(root_node); |
0fa1986f JF |
423 | out_put_card: |
424 | fw_card_put(card); | |
19a15b93 KH |
425 | } |
426 | ||
53dca511 SR |
427 | void fw_card_initialize(struct fw_card *card, |
428 | const struct fw_card_driver *driver, | |
429 | struct device *device) | |
3038e353 | 430 | { |
bbf19db3 | 431 | static atomic_t index = ATOMIC_INIT(-1); |
3038e353 | 432 | |
bbf19db3 | 433 | card->index = atomic_inc_return(&index); |
5e20c282 | 434 | card->driver = driver; |
3038e353 | 435 | card->device = device; |
5e20c282 SR |
436 | card->current_tlabel = 0; |
437 | card->tlabel_mask = 0; | |
8e4b50f9 CL |
438 | card->split_timeout_hi = 0; |
439 | card->split_timeout_lo = 800 << 19; | |
440 | card->split_timeout_cycles = 800; | |
441 | card->split_timeout_jiffies = DIV_ROUND_UP(HZ, 10); | |
3038e353 | 442 | card->color = 0; |
e534fe16 | 443 | card->broadcast_channel = BROADCAST_CHANNEL_INITIAL; |
3038e353 | 444 | |
459f7923 SR |
445 | kref_init(&card->kref); |
446 | init_completion(&card->done); | |
5e20c282 | 447 | INIT_LIST_HEAD(&card->transaction_list); |
3038e353 | 448 | spin_lock_init(&card->lock); |
3038e353 KH |
449 | |
450 | card->local_node = NULL; | |
451 | ||
931c4834 | 452 | INIT_DELAYED_WORK(&card->work, fw_card_bm_work); |
3038e353 KH |
453 | } |
454 | EXPORT_SYMBOL(fw_card_initialize); | |
455 | ||
53dca511 SR |
456 | int fw_card_add(struct fw_card *card, |
457 | u32 max_receive, u32 link_speed, u64 guid) | |
3038e353 | 458 | { |
e1eff7a3 | 459 | int ret; |
3038e353 KH |
460 | |
461 | card->max_receive = max_receive; | |
462 | card->link_speed = link_speed; | |
463 | card->guid = guid; | |
464 | ||
6a5033be | 465 | mutex_lock(&card_mutex); |
3038e353 | 466 | |
e300839d SR |
467 | generate_config_rom(card, tmp_config_rom); |
468 | ret = card->driver->enable(card, tmp_config_rom, config_rom_length); | |
b171e204 SR |
469 | if (ret == 0) |
470 | list_add_tail(&card->link, &card_list); | |
471 | ||
472 | mutex_unlock(&card_mutex); | |
e1eff7a3 SR |
473 | |
474 | return ret; | |
3038e353 KH |
475 | } |
476 | EXPORT_SYMBOL(fw_card_add); | |
477 | ||
478 | ||
c781c06d | 479 | /* |
d645f4da SR |
480 | * The next few functions implement a dummy driver that is used once a card |
481 | * driver shuts down an fw_card. This allows the driver to cleanly unload, | |
482 | * as all IO to the card will be handled (and failed) by the dummy driver | |
483 | * instead of calling into the module. Only functions for iso context | |
484 | * shutdown still need to be provided by the card driver. | |
c781c06d | 485 | */ |
3038e353 | 486 | |
8e85973e SR |
487 | static int dummy_enable(struct fw_card *card, |
488 | const __be32 *config_rom, size_t length) | |
3038e353 KH |
489 | { |
490 | BUG(); | |
491 | return -1; | |
492 | } | |
493 | ||
53dca511 SR |
494 | static int dummy_update_phy_reg(struct fw_card *card, int address, |
495 | int clear_bits, int set_bits) | |
3038e353 KH |
496 | { |
497 | return -ENODEV; | |
498 | } | |
499 | ||
53dca511 | 500 | static int dummy_set_config_rom(struct fw_card *card, |
8e85973e | 501 | const __be32 *config_rom, size_t length) |
3038e353 | 502 | { |
c781c06d KH |
503 | /* |
504 | * We take the card out of card_list before setting the dummy | |
505 | * driver, so this should never get called. | |
506 | */ | |
3038e353 KH |
507 | BUG(); |
508 | return -1; | |
509 | } | |
510 | ||
53dca511 | 511 | static void dummy_send_request(struct fw_card *card, struct fw_packet *packet) |
3038e353 | 512 | { |
5e20c282 | 513 | packet->callback(packet, card, -ENODEV); |
3038e353 KH |
514 | } |
515 | ||
53dca511 | 516 | static void dummy_send_response(struct fw_card *card, struct fw_packet *packet) |
3038e353 | 517 | { |
5e20c282 | 518 | packet->callback(packet, card, -ENODEV); |
3038e353 KH |
519 | } |
520 | ||
53dca511 | 521 | static int dummy_cancel_packet(struct fw_card *card, struct fw_packet *packet) |
730c32f5 KH |
522 | { |
523 | return -ENOENT; | |
524 | } | |
525 | ||
53dca511 SR |
526 | static int dummy_enable_phys_dma(struct fw_card *card, |
527 | int node_id, int generation) | |
3038e353 KH |
528 | { |
529 | return -ENODEV; | |
530 | } | |
531 | ||
d645f4da | 532 | static const struct fw_card_driver dummy_driver_template = { |
3038e353 KH |
533 | .enable = dummy_enable, |
534 | .update_phy_reg = dummy_update_phy_reg, | |
535 | .set_config_rom = dummy_set_config_rom, | |
5e20c282 | 536 | .send_request = dummy_send_request, |
730c32f5 | 537 | .cancel_packet = dummy_cancel_packet, |
5e20c282 | 538 | .send_response = dummy_send_response, |
5af4e5ea | 539 | .enable_phys_dma = dummy_enable_phys_dma, |
3038e353 KH |
540 | }; |
541 | ||
53dca511 | 542 | void fw_card_release(struct kref *kref) |
459f7923 SR |
543 | { |
544 | struct fw_card *card = container_of(kref, struct fw_card, kref); | |
545 | ||
546 | complete(&card->done); | |
547 | } | |
548 | ||
53dca511 | 549 | void fw_core_remove_card(struct fw_card *card) |
3038e353 | 550 | { |
d645f4da SR |
551 | struct fw_card_driver dummy_driver = dummy_driver_template; |
552 | ||
ecab4133 MB |
553 | card->driver->update_phy_reg(card, 4, |
554 | PHY_LINK_ACTIVE | PHY_CONTENDER, 0); | |
3038e353 KH |
555 | fw_core_initiate_bus_reset(card, 1); |
556 | ||
6a5033be | 557 | mutex_lock(&card_mutex); |
e747a5c0 | 558 | list_del_init(&card->link); |
6a5033be | 559 | mutex_unlock(&card_mutex); |
3038e353 | 560 | |
d645f4da SR |
561 | /* Switch off most of the card driver interface. */ |
562 | dummy_driver.free_iso_context = card->driver->free_iso_context; | |
563 | dummy_driver.stop_iso = card->driver->stop_iso; | |
3038e353 KH |
564 | card->driver = &dummy_driver; |
565 | ||
3038e353 | 566 | fw_destroy_nodes(card); |
459f7923 SR |
567 | |
568 | /* Wait for all users, especially device workqueue jobs, to finish. */ | |
569 | fw_card_put(card); | |
570 | wait_for_completion(&card->done); | |
8a2d9ed3 | 571 | |
1e8afea1 | 572 | WARN_ON(!list_empty(&card->transaction_list)); |
3038e353 KH |
573 | } |
574 | EXPORT_SYMBOL(fw_core_remove_card); | |
575 | ||
53dca511 | 576 | int fw_core_initiate_bus_reset(struct fw_card *card, int short_reset) |
3038e353 | 577 | { |
ecab4133 | 578 | int reg = short_reset ? 5 : 1; |
ecab4133 MB |
579 | int bit = short_reset ? PHY_BUS_SHORT_RESET : PHY_BUS_RESET; |
580 | ||
581 | return card->driver->update_phy_reg(card, reg, 0, bit); | |
3038e353 KH |
582 | } |
583 | EXPORT_SYMBOL(fw_core_initiate_bus_reset); |