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 | ||
60063497 | 35 | #include <linux/atomic.h> |
e8ca9702 | 36 | #include <asm/byteorder.h> |
459f7923 | 37 | |
77c9a5da | 38 | #include "core.h" |
3038e353 | 39 | |
26b4950d SR |
40 | #define define_fw_printk_level(func, kern_level) \ |
41 | void func(const struct fw_card *card, const char *fmt, ...) \ | |
42 | { \ | |
43 | struct va_format vaf; \ | |
44 | va_list args; \ | |
45 | \ | |
46 | va_start(args, fmt); \ | |
47 | vaf.fmt = fmt; \ | |
48 | vaf.va = &args; \ | |
49 | printk(kern_level KBUILD_MODNAME " %s: %pV", \ | |
50 | dev_name(card->device), &vaf); \ | |
51 | va_end(args); \ | |
52 | } | |
53 | define_fw_printk_level(fw_err, KERN_ERR); | |
54 | define_fw_printk_level(fw_notice, KERN_NOTICE); | |
55 | ||
cb7c96da | 56 | int fw_compute_block_crc(__be32 *block) |
8e85973e SR |
57 | { |
58 | int length; | |
59 | u16 crc; | |
60 | ||
61 | length = (be32_to_cpu(block[0]) >> 16) & 0xff; | |
62 | crc = crc_itu_t(0, (u8 *)&block[1], length * 4); | |
63 | *block |= cpu_to_be32(crc); | |
64 | ||
65 | return length; | |
66 | } | |
67 | ||
6a5033be | 68 | static DEFINE_MUTEX(card_mutex); |
3038e353 KH |
69 | static LIST_HEAD(card_list); |
70 | ||
71 | static LIST_HEAD(descriptor_list); | |
72 | static int descriptor_count; | |
73 | ||
fe242579 | 74 | static __be32 tmp_config_rom[256]; |
e300839d SR |
75 | /* ROM header, bus info block, root dir header, capabilities = 7 quadlets */ |
76 | static size_t config_rom_length = 1 + 4 + 1 + 1; | |
fe242579 | 77 | |
a77754a7 KH |
78 | #define BIB_CRC(v) ((v) << 0) |
79 | #define BIB_CRC_LENGTH(v) ((v) << 16) | |
80 | #define BIB_INFO_LENGTH(v) ((v) << 24) | |
edd5bdaf | 81 | #define BIB_BUS_NAME 0x31333934 /* "1394" */ |
a77754a7 KH |
82 | #define BIB_LINK_SPEED(v) ((v) << 0) |
83 | #define BIB_GENERATION(v) ((v) << 4) | |
84 | #define BIB_MAX_ROM(v) ((v) << 8) | |
85 | #define BIB_MAX_RECEIVE(v) ((v) << 12) | |
86 | #define BIB_CYC_CLK_ACC(v) ((v) << 16) | |
87 | #define BIB_PMC ((1) << 27) | |
88 | #define BIB_BMC ((1) << 28) | |
89 | #define BIB_ISC ((1) << 29) | |
90 | #define BIB_CMC ((1) << 30) | |
edd5bdaf SR |
91 | #define BIB_IRMC ((1) << 31) |
92 | #define NODE_CAPABILITIES 0x0c0083c0 /* per IEEE 1394 clause 8.3.2.6.5.2 */ | |
3038e353 | 93 | |
dd5eeb99 CL |
94 | /* |
95 | * IEEE-1394 specifies a default SPLIT_TIMEOUT value of 800 cycles (100 ms), | |
96 | * but we have to make it longer because there are many devices whose firmware | |
97 | * is just too slow for that. | |
98 | */ | |
99 | #define DEFAULT_SPLIT_TIMEOUT (2 * 8000) | |
100 | ||
6044565a SR |
101 | #define CANON_OUI 0x000085 |
102 | ||
e300839d | 103 | static void generate_config_rom(struct fw_card *card, __be32 *config_rom) |
3038e353 KH |
104 | { |
105 | struct fw_descriptor *desc; | |
8e85973e | 106 | int i, j, k, length; |
3038e353 | 107 | |
c781c06d KH |
108 | /* |
109 | * Initialize contents of config rom buffer. On the OHCI | |
5e20c282 SR |
110 | * controller, block reads to the config rom accesses the host |
111 | * memory, but quadlet read access the hardware bus info block | |
112 | * registers. That's just crack, but it means we should make | |
2cc489c2 | 113 | * sure the contents of bus info block in host memory matches |
c781c06d KH |
114 | * the version stored in the OHCI registers. |
115 | */ | |
3038e353 | 116 | |
8e85973e SR |
117 | config_rom[0] = cpu_to_be32( |
118 | BIB_CRC_LENGTH(4) | BIB_INFO_LENGTH(4) | BIB_CRC(0)); | |
edd5bdaf | 119 | config_rom[1] = cpu_to_be32(BIB_BUS_NAME); |
8e85973e | 120 | config_rom[2] = cpu_to_be32( |
a77754a7 KH |
121 | BIB_LINK_SPEED(card->link_speed) | |
122 | BIB_GENERATION(card->config_rom_generation++ % 14 + 2) | | |
123 | BIB_MAX_ROM(2) | | |
124 | BIB_MAX_RECEIVE(card->max_receive) | | |
edd5bdaf | 125 | BIB_BMC | BIB_ISC | BIB_CMC | BIB_IRMC); |
8e85973e SR |
126 | config_rom[3] = cpu_to_be32(card->guid >> 32); |
127 | config_rom[4] = cpu_to_be32(card->guid); | |
3038e353 KH |
128 | |
129 | /* Generate root directory. */ | |
edd5bdaf | 130 | config_rom[6] = cpu_to_be32(NODE_CAPABILITIES); |
8e85973e SR |
131 | i = 7; |
132 | j = 7 + descriptor_count; | |
3038e353 KH |
133 | |
134 | /* Generate root directory entries for descriptors. */ | |
135 | list_for_each_entry (desc, &descriptor_list, link) { | |
937f6879 | 136 | if (desc->immediate > 0) |
8e85973e SR |
137 | config_rom[i++] = cpu_to_be32(desc->immediate); |
138 | config_rom[i] = cpu_to_be32(desc->key | (j - i)); | |
3038e353 KH |
139 | i++; |
140 | j += desc->length; | |
141 | } | |
142 | ||
143 | /* Update root directory length. */ | |
8e85973e | 144 | config_rom[5] = cpu_to_be32((i - 5 - 1) << 16); |
3038e353 KH |
145 | |
146 | /* End of root directory, now copy in descriptors. */ | |
147 | list_for_each_entry (desc, &descriptor_list, link) { | |
8e85973e SR |
148 | for (k = 0; k < desc->length; k++) |
149 | config_rom[i + k] = cpu_to_be32(desc->data[k]); | |
3038e353 KH |
150 | i += desc->length; |
151 | } | |
152 | ||
153 | /* Calculate CRCs for all blocks in the config rom. This | |
154 | * assumes that CRC length and info length are identical for | |
155 | * the bus info block, which is always the case for this | |
156 | * implementation. */ | |
e175569c | 157 | for (i = 0; i < j; i += length + 1) |
cb7c96da | 158 | length = fw_compute_block_crc(config_rom + i); |
3038e353 | 159 | |
e300839d | 160 | WARN_ON(j != config_rom_length); |
3038e353 KH |
161 | } |
162 | ||
53dca511 | 163 | static void update_config_roms(void) |
3038e353 KH |
164 | { |
165 | struct fw_card *card; | |
3038e353 KH |
166 | |
167 | list_for_each_entry (card, &card_list, link) { | |
e300839d SR |
168 | generate_config_rom(card, tmp_config_rom); |
169 | card->driver->set_config_rom(card, tmp_config_rom, | |
170 | config_rom_length); | |
3038e353 KH |
171 | } |
172 | } | |
173 | ||
e300839d SR |
174 | static size_t required_space(struct fw_descriptor *desc) |
175 | { | |
176 | /* descriptor + entry into root dir + optional immediate entry */ | |
177 | return desc->length + 1 + (desc->immediate > 0 ? 1 : 0); | |
178 | } | |
179 | ||
53dca511 | 180 | int fw_core_add_descriptor(struct fw_descriptor *desc) |
3038e353 KH |
181 | { |
182 | size_t i; | |
e300839d | 183 | int ret; |
3038e353 | 184 | |
c781c06d KH |
185 | /* |
186 | * Check descriptor is valid; the length of all blocks in the | |
3038e353 | 187 | * descriptor has to add up to exactly the length of the |
c781c06d KH |
188 | * block. |
189 | */ | |
3038e353 KH |
190 | i = 0; |
191 | while (i < desc->length) | |
192 | i += (desc->data[i] >> 16) + 1; | |
193 | ||
194 | if (i != desc->length) | |
66dea3e5 | 195 | return -EINVAL; |
3038e353 | 196 | |
6a5033be | 197 | mutex_lock(&card_mutex); |
3038e353 | 198 | |
e300839d SR |
199 | if (config_rom_length + required_space(desc) > 256) { |
200 | ret = -EBUSY; | |
201 | } else { | |
202 | list_add_tail(&desc->link, &descriptor_list); | |
203 | config_rom_length += required_space(desc); | |
937f6879 | 204 | descriptor_count++; |
e300839d SR |
205 | if (desc->immediate > 0) |
206 | descriptor_count++; | |
207 | update_config_roms(); | |
208 | ret = 0; | |
209 | } | |
3038e353 | 210 | |
6a5033be | 211 | mutex_unlock(&card_mutex); |
3038e353 | 212 | |
e300839d | 213 | return ret; |
3038e353 | 214 | } |
c76acec6 | 215 | EXPORT_SYMBOL(fw_core_add_descriptor); |
3038e353 | 216 | |
53dca511 | 217 | void fw_core_remove_descriptor(struct fw_descriptor *desc) |
3038e353 | 218 | { |
6a5033be | 219 | mutex_lock(&card_mutex); |
3038e353 KH |
220 | |
221 | list_del(&desc->link); | |
e300839d | 222 | config_rom_length -= required_space(desc); |
3038e353 | 223 | descriptor_count--; |
937f6879 KH |
224 | if (desc->immediate > 0) |
225 | descriptor_count--; | |
3038e353 KH |
226 | update_config_roms(); |
227 | ||
6a5033be | 228 | mutex_unlock(&card_mutex); |
3038e353 | 229 | } |
c76acec6 | 230 | EXPORT_SYMBOL(fw_core_remove_descriptor); |
3038e353 | 231 | |
02d37bed SR |
232 | static int reset_bus(struct fw_card *card, bool short_reset) |
233 | { | |
234 | int reg = short_reset ? 5 : 1; | |
235 | int bit = short_reset ? PHY_BUS_SHORT_RESET : PHY_BUS_RESET; | |
236 | ||
237 | return card->driver->update_phy_reg(card, reg, 0, bit); | |
238 | } | |
239 | ||
240 | void fw_schedule_bus_reset(struct fw_card *card, bool delayed, bool short_reset) | |
241 | { | |
242 | /* We don't try hard to sort out requests of long vs. short resets. */ | |
243 | card->br_short = short_reset; | |
244 | ||
245 | /* Use an arbitrary short delay to combine multiple reset requests. */ | |
246 | fw_card_get(card); | |
105e53f8 | 247 | if (!queue_delayed_work(fw_workqueue, &card->br_work, |
6ea9e7bb | 248 | delayed ? DIV_ROUND_UP(HZ, 100) : 0)) |
02d37bed SR |
249 | fw_card_put(card); |
250 | } | |
251 | EXPORT_SYMBOL(fw_schedule_bus_reset); | |
252 | ||
253 | static void br_work(struct work_struct *work) | |
254 | { | |
255 | struct fw_card *card = container_of(work, struct fw_card, br_work.work); | |
256 | ||
257 | /* Delay for 2s after last reset per IEEE 1394 clause 8.2.1. */ | |
258 | if (card->reset_jiffies != 0 && | |
e71084af | 259 | time_before64(get_jiffies_64(), card->reset_jiffies + 2 * HZ)) { |
105e53f8 | 260 | if (!queue_delayed_work(fw_workqueue, &card->br_work, 2 * HZ)) |
02d37bed SR |
261 | fw_card_put(card); |
262 | return; | |
263 | } | |
264 | ||
265 | fw_send_phy_config(card, FW_PHY_CONFIG_NO_NODE_ID, card->generation, | |
266 | FW_PHY_CONFIG_CURRENT_GAP_COUNT); | |
267 | reset_bus(card, card->br_short); | |
268 | fw_card_put(card); | |
269 | } | |
270 | ||
cbae787c | 271 | static void allocate_broadcast_channel(struct fw_card *card, int generation) |
6104ee92 | 272 | { |
cbae787c SR |
273 | int channel, bandwidth = 0; |
274 | ||
e91b2787 CL |
275 | if (!card->broadcast_channel_allocated) { |
276 | fw_iso_resource_manage(card, generation, 1ULL << 31, | |
f30e6d3e | 277 | &channel, &bandwidth, true); |
e91b2787 | 278 | if (channel != 31) { |
26b4950d | 279 | fw_notice(card, "failed to allocate broadcast channel\n"); |
e91b2787 CL |
280 | return; |
281 | } | |
7889b60e | 282 | card->broadcast_channel_allocated = true; |
6104ee92 | 283 | } |
e91b2787 CL |
284 | |
285 | device_for_each_child(card->device, (void *)(long)generation, | |
286 | fw_device_set_broadcast_channel); | |
6104ee92 | 287 | } |
6104ee92 | 288 | |
83db801c KH |
289 | static const char gap_count_table[] = { |
290 | 63, 5, 7, 8, 10, 13, 16, 18, 21, 24, 26, 29, 32, 35, 37, 40 | |
291 | }; | |
292 | ||
53dca511 | 293 | void fw_schedule_bm_work(struct fw_card *card, unsigned long delay) |
0fa1986f | 294 | { |
0fa1986f | 295 | fw_card_get(card); |
02d37bed | 296 | if (!schedule_delayed_work(&card->bm_work, delay)) |
0fa1986f JF |
297 | fw_card_put(card); |
298 | } | |
299 | ||
02d37bed | 300 | static void bm_work(struct work_struct *work) |
19a15b93 | 301 | { |
02d37bed | 302 | struct fw_card *card = container_of(work, struct fw_card, bm_work.work); |
10389536 | 303 | struct fw_device *root_device, *irm_device; |
cbae787c | 304 | struct fw_node *root_node; |
250b2b6d | 305 | int root_id, new_root_id, irm_id, bm_id, local_id; |
cbae787c | 306 | int gap_count, generation, grace, rcode; |
25b1c3d8 | 307 | bool do_reset = false; |
62305823 SR |
308 | bool root_device_is_running; |
309 | bool root_device_is_cmc; | |
10389536 | 310 | bool irm_is_1394_1995_only; |
6044565a | 311 | bool keep_this_irm; |
f30e6d3e | 312 | __be32 transaction_data[2]; |
19a15b93 | 313 | |
ae948011 | 314 | spin_lock_irq(&card->lock); |
15803478 | 315 | |
cbae787c | 316 | if (card->local_node == NULL) { |
ae948011 | 317 | spin_unlock_irq(&card->lock); |
0fa1986f | 318 | goto out_put_card; |
15803478 | 319 | } |
19a15b93 KH |
320 | |
321 | generation = card->generation; | |
10389536 | 322 | |
cbae787c SR |
323 | root_node = card->root_node; |
324 | fw_node_get(root_node); | |
15803478 | 325 | root_device = root_node->data; |
62305823 SR |
326 | root_device_is_running = root_device && |
327 | atomic_read(&root_device->state) == FW_DEVICE_RUNNING; | |
328 | root_device_is_cmc = root_device && root_device->cmc; | |
10389536 SR |
329 | |
330 | irm_device = card->irm_node->data; | |
331 | irm_is_1394_1995_only = irm_device && irm_device->config_rom && | |
332 | (irm_device->config_rom[2] & 0x000000f0) == 0; | |
333 | ||
6044565a SR |
334 | /* Canon MV5i works unreliably if it is not root node. */ |
335 | keep_this_irm = irm_device && irm_device->config_rom && | |
336 | irm_device->config_rom[3] >> 8 == CANON_OUI; | |
337 | ||
cbae787c SR |
338 | root_id = root_node->node_id; |
339 | irm_id = card->irm_node->node_id; | |
340 | local_id = card->local_node->node_id; | |
e1dc7cab | 341 | |
e71084af CL |
342 | grace = time_after64(get_jiffies_64(), |
343 | card->reset_jiffies + DIV_ROUND_UP(HZ, 8)); | |
e1dc7cab | 344 | |
7e0e314f CL |
345 | if ((is_next_generation(generation, card->bm_generation) && |
346 | !card->bm_abdicate) || | |
931c4834 | 347 | (card->bm_generation != generation && grace)) { |
c781c06d KH |
348 | /* |
349 | * This first step is to figure out who is IRM and | |
931c4834 KH |
350 | * then try to become bus manager. If the IRM is not |
351 | * well defined (e.g. does not have an active link | |
352 | * layer or does not responds to our lock request, we | |
353 | * will have to do a little vigilante bus management. | |
354 | * In that case, we do a goto into the gap count logic | |
355 | * so that when we do the reset, we still optimize the | |
356 | * gap count. That could well save a reset in the | |
c781c06d KH |
357 | * next generation. |
358 | */ | |
931c4834 | 359 | |
cbae787c SR |
360 | if (!card->irm_node->link_on) { |
361 | new_root_id = local_id; | |
26b4950d | 362 | fw_notice(card, "%s, making local node (%02x) root\n", |
10389536 SR |
363 | "IRM has link off", new_root_id); |
364 | goto pick_me; | |
365 | } | |
366 | ||
6044565a | 367 | if (irm_is_1394_1995_only && !keep_this_irm) { |
10389536 | 368 | new_root_id = local_id; |
26b4950d | 369 | fw_notice(card, "%s, making local node (%02x) root\n", |
10389536 | 370 | "IRM is not 1394a compliant", new_root_id); |
931c4834 KH |
371 | goto pick_me; |
372 | } | |
373 | ||
f30e6d3e SR |
374 | transaction_data[0] = cpu_to_be32(0x3f); |
375 | transaction_data[1] = cpu_to_be32(local_id); | |
931c4834 | 376 | |
ae948011 | 377 | spin_unlock_irq(&card->lock); |
931c4834 | 378 | |
1e119fa9 JF |
379 | rcode = fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP, |
380 | irm_id, generation, SCODE_100, | |
381 | CSR_REGISTER_BASE + CSR_BUS_MANAGER_ID, | |
f30e6d3e | 382 | transaction_data, 8); |
931c4834 | 383 | |
1e119fa9 JF |
384 | if (rcode == RCODE_GENERATION) |
385 | /* Another bus reset, BM work has been rescheduled. */ | |
15803478 | 386 | goto out; |
931c4834 | 387 | |
f30e6d3e | 388 | bm_id = be32_to_cpu(transaction_data[0]); |
cbae787c | 389 | |
250b2b6d SR |
390 | spin_lock_irq(&card->lock); |
391 | if (rcode == RCODE_COMPLETE && generation == card->generation) | |
392 | card->bm_node_id = | |
393 | bm_id == 0x3f ? local_id : 0xffc0 | bm_id; | |
394 | spin_unlock_irq(&card->lock); | |
cbae787c | 395 | |
250b2b6d | 396 | if (rcode == RCODE_COMPLETE && bm_id != 0x3f) { |
cbae787c SR |
397 | /* Somebody else is BM. Only act as IRM. */ |
398 | if (local_id == irm_id) | |
399 | allocate_broadcast_channel(card, generation); | |
400 | ||
15803478 | 401 | goto out; |
6104ee92 | 402 | } |
931c4834 | 403 | |
bda3b8a1 CL |
404 | if (rcode == RCODE_SEND_ERROR) { |
405 | /* | |
406 | * We have been unable to send the lock request due to | |
407 | * some local problem. Let's try again later and hope | |
408 | * that the problem has gone away by then. | |
409 | */ | |
410 | fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 8)); | |
411 | goto out; | |
412 | } | |
413 | ||
ae948011 | 414 | spin_lock_irq(&card->lock); |
1e119fa9 | 415 | |
6044565a | 416 | if (rcode != RCODE_COMPLETE && !keep_this_irm) { |
c781c06d KH |
417 | /* |
418 | * The lock request failed, maybe the IRM | |
931c4834 KH |
419 | * isn't really IRM capable after all. Let's |
420 | * do a bus reset and pick the local node as | |
c781c06d KH |
421 | * root, and thus, IRM. |
422 | */ | |
cbae787c | 423 | new_root_id = local_id; |
3b00b008 CL |
424 | fw_notice(card, "BM lock failed (%s), making local node (%02x) root\n", |
425 | fw_rcode_string(rcode), new_root_id); | |
931c4834 KH |
426 | goto pick_me; |
427 | } | |
428 | } else if (card->bm_generation != generation) { | |
c781c06d | 429 | /* |
e1dc7cab SR |
430 | * We weren't BM in the last generation, and the last |
431 | * bus reset is less than 125ms ago. Reschedule this job. | |
c781c06d | 432 | */ |
ae948011 | 433 | spin_unlock_irq(&card->lock); |
e1dc7cab | 434 | fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 8)); |
15803478 | 435 | goto out; |
931c4834 KH |
436 | } |
437 | ||
c781c06d KH |
438 | /* |
439 | * We're bus manager for this generation, so next step is to | |
931c4834 | 440 | * make sure we have an active cycle master and do gap count |
c781c06d KH |
441 | * optimization. |
442 | */ | |
931c4834 | 443 | card->bm_generation = generation; |
19a15b93 | 444 | |
15803478 | 445 | if (root_device == NULL) { |
c781c06d KH |
446 | /* |
447 | * Either link_on is false, or we failed to read the | |
448 | * config rom. In either case, pick another root. | |
449 | */ | |
cbae787c | 450 | new_root_id = local_id; |
62305823 | 451 | } else if (!root_device_is_running) { |
c781c06d KH |
452 | /* |
453 | * If we haven't probed this device yet, bail out now | |
454 | * and let's try again once that's done. | |
455 | */ | |
ae948011 | 456 | spin_unlock_irq(&card->lock); |
15803478 | 457 | goto out; |
62305823 | 458 | } else if (root_device_is_cmc) { |
c781c06d | 459 | /* |
c374ab42 CL |
460 | * We will send out a force root packet for this |
461 | * node as part of the gap count optimization. | |
c781c06d | 462 | */ |
931c4834 | 463 | new_root_id = root_id; |
83db801c | 464 | } else { |
c781c06d KH |
465 | /* |
466 | * Current root has an active link layer and we | |
19a15b93 | 467 | * successfully read the config rom, but it's not |
c781c06d KH |
468 | * cycle master capable. |
469 | */ | |
cbae787c | 470 | new_root_id = local_id; |
83db801c KH |
471 | } |
472 | ||
931c4834 | 473 | pick_me: |
24d40125 SR |
474 | /* |
475 | * Pick a gap count from 1394a table E-1. The table doesn't cover | |
476 | * the typically much larger 1394b beta repeater delays though. | |
477 | */ | |
478 | if (!card->beta_repeaters_present && | |
15803478 SR |
479 | root_node->max_hops < ARRAY_SIZE(gap_count_table)) |
480 | gap_count = gap_count_table[root_node->max_hops]; | |
83db801c KH |
481 | else |
482 | gap_count = 63; | |
483 | ||
c781c06d | 484 | /* |
25b1c3d8 SR |
485 | * Finally, figure out if we should do a reset or not. If we have |
486 | * done less than 5 resets with the same physical topology and we | |
c781c06d KH |
487 | * have either a new root or a new gap count setting, let's do it. |
488 | */ | |
19a15b93 | 489 | |
931c4834 KH |
490 | if (card->bm_retries++ < 5 && |
491 | (card->gap_count != gap_count || new_root_id != root_id)) | |
25b1c3d8 | 492 | do_reset = true; |
19a15b93 | 493 | |
ae948011 | 494 | spin_unlock_irq(&card->lock); |
19a15b93 | 495 | |
83db801c | 496 | if (do_reset) { |
26b4950d SR |
497 | fw_notice(card, "phy config: new root=%x, gap_count=%d\n", |
498 | new_root_id, gap_count); | |
931c4834 | 499 | fw_send_phy_config(card, new_root_id, generation, gap_count); |
02d37bed | 500 | reset_bus(card, true); |
cbae787c | 501 | /* Will allocate broadcast channel after the reset. */ |
c374ab42 | 502 | goto out; |
19a15b93 | 503 | } |
6104ee92 | 504 | |
c374ab42 CL |
505 | if (root_device_is_cmc) { |
506 | /* | |
507 | * Make sure that the cycle master sends cycle start packets. | |
508 | */ | |
f30e6d3e | 509 | transaction_data[0] = cpu_to_be32(CSR_STATE_BIT_CMSTR); |
c374ab42 CL |
510 | rcode = fw_run_transaction(card, TCODE_WRITE_QUADLET_REQUEST, |
511 | root_id, generation, SCODE_100, | |
512 | CSR_REGISTER_BASE + CSR_STATE_SET, | |
f30e6d3e | 513 | transaction_data, 4); |
c374ab42 CL |
514 | if (rcode == RCODE_GENERATION) |
515 | goto out; | |
19a15b93 | 516 | } |
6104ee92 | 517 | |
c374ab42 CL |
518 | if (local_id == irm_id) |
519 | allocate_broadcast_channel(card, generation); | |
520 | ||
15803478 | 521 | out: |
15803478 | 522 | fw_node_put(root_node); |
0fa1986f JF |
523 | out_put_card: |
524 | fw_card_put(card); | |
19a15b93 KH |
525 | } |
526 | ||
53dca511 SR |
527 | void fw_card_initialize(struct fw_card *card, |
528 | const struct fw_card_driver *driver, | |
529 | struct device *device) | |
3038e353 | 530 | { |
bbf19db3 | 531 | static atomic_t index = ATOMIC_INIT(-1); |
3038e353 | 532 | |
bbf19db3 | 533 | card->index = atomic_inc_return(&index); |
5e20c282 | 534 | card->driver = driver; |
3038e353 | 535 | card->device = device; |
5e20c282 SR |
536 | card->current_tlabel = 0; |
537 | card->tlabel_mask = 0; | |
dd5eeb99 CL |
538 | card->split_timeout_hi = DEFAULT_SPLIT_TIMEOUT / 8000; |
539 | card->split_timeout_lo = (DEFAULT_SPLIT_TIMEOUT % 8000) << 19; | |
540 | card->split_timeout_cycles = DEFAULT_SPLIT_TIMEOUT; | |
541 | card->split_timeout_jiffies = | |
542 | DIV_ROUND_UP(DEFAULT_SPLIT_TIMEOUT * HZ, 8000); | |
3038e353 | 543 | card->color = 0; |
e534fe16 | 544 | card->broadcast_channel = BROADCAST_CHANNEL_INITIAL; |
3038e353 | 545 | |
459f7923 SR |
546 | kref_init(&card->kref); |
547 | init_completion(&card->done); | |
5e20c282 | 548 | INIT_LIST_HEAD(&card->transaction_list); |
bf54e146 | 549 | INIT_LIST_HEAD(&card->phy_receiver_list); |
3038e353 | 550 | spin_lock_init(&card->lock); |
3038e353 KH |
551 | |
552 | card->local_node = NULL; | |
553 | ||
02d37bed SR |
554 | INIT_DELAYED_WORK(&card->br_work, br_work); |
555 | INIT_DELAYED_WORK(&card->bm_work, bm_work); | |
3038e353 KH |
556 | } |
557 | EXPORT_SYMBOL(fw_card_initialize); | |
558 | ||
53dca511 SR |
559 | int fw_card_add(struct fw_card *card, |
560 | u32 max_receive, u32 link_speed, u64 guid) | |
3038e353 | 561 | { |
e1eff7a3 | 562 | int ret; |
3038e353 KH |
563 | |
564 | card->max_receive = max_receive; | |
565 | card->link_speed = link_speed; | |
566 | card->guid = guid; | |
567 | ||
6a5033be | 568 | mutex_lock(&card_mutex); |
3038e353 | 569 | |
e300839d SR |
570 | generate_config_rom(card, tmp_config_rom); |
571 | ret = card->driver->enable(card, tmp_config_rom, config_rom_length); | |
b171e204 SR |
572 | if (ret == 0) |
573 | list_add_tail(&card->link, &card_list); | |
574 | ||
575 | mutex_unlock(&card_mutex); | |
e1eff7a3 SR |
576 | |
577 | return ret; | |
3038e353 KH |
578 | } |
579 | EXPORT_SYMBOL(fw_card_add); | |
580 | ||
c781c06d | 581 | /* |
d645f4da SR |
582 | * The next few functions implement a dummy driver that is used once a card |
583 | * driver shuts down an fw_card. This allows the driver to cleanly unload, | |
584 | * as all IO to the card will be handled (and failed) by the dummy driver | |
585 | * instead of calling into the module. Only functions for iso context | |
586 | * shutdown still need to be provided by the card driver. | |
20802224 SR |
587 | * |
588 | * .read/write_csr() should never be called anymore after the dummy driver | |
589 | * was bound since they are only used within request handler context. | |
590 | * .set_config_rom() is never called since the card is taken out of card_list | |
591 | * before switching to the dummy driver. | |
c781c06d | 592 | */ |
3038e353 | 593 | |
02d37bed | 594 | static int dummy_read_phy_reg(struct fw_card *card, int address) |
3038e353 | 595 | { |
02d37bed | 596 | return -ENODEV; |
3038e353 KH |
597 | } |
598 | ||
53dca511 SR |
599 | static int dummy_update_phy_reg(struct fw_card *card, int address, |
600 | int clear_bits, int set_bits) | |
3038e353 KH |
601 | { |
602 | return -ENODEV; | |
603 | } | |
604 | ||
53dca511 | 605 | static void dummy_send_request(struct fw_card *card, struct fw_packet *packet) |
3038e353 | 606 | { |
18d0cdfd | 607 | packet->callback(packet, card, RCODE_CANCELLED); |
3038e353 KH |
608 | } |
609 | ||
53dca511 | 610 | static void dummy_send_response(struct fw_card *card, struct fw_packet *packet) |
3038e353 | 611 | { |
18d0cdfd | 612 | packet->callback(packet, card, RCODE_CANCELLED); |
3038e353 KH |
613 | } |
614 | ||
53dca511 | 615 | static int dummy_cancel_packet(struct fw_card *card, struct fw_packet *packet) |
730c32f5 KH |
616 | { |
617 | return -ENOENT; | |
618 | } | |
619 | ||
53dca511 SR |
620 | static int dummy_enable_phys_dma(struct fw_card *card, |
621 | int node_id, int generation) | |
3038e353 KH |
622 | { |
623 | return -ENODEV; | |
624 | } | |
625 | ||
20802224 SR |
626 | static struct fw_iso_context *dummy_allocate_iso_context(struct fw_card *card, |
627 | int type, int channel, size_t header_size) | |
628 | { | |
629 | return ERR_PTR(-ENODEV); | |
630 | } | |
631 | ||
632 | static int dummy_start_iso(struct fw_iso_context *ctx, | |
633 | s32 cycle, u32 sync, u32 tags) | |
634 | { | |
635 | return -ENODEV; | |
636 | } | |
637 | ||
638 | static int dummy_set_iso_channels(struct fw_iso_context *ctx, u64 *channels) | |
639 | { | |
640 | return -ENODEV; | |
641 | } | |
642 | ||
643 | static int dummy_queue_iso(struct fw_iso_context *ctx, struct fw_iso_packet *p, | |
644 | struct fw_iso_buffer *buffer, unsigned long payload) | |
645 | { | |
646 | return -ENODEV; | |
647 | } | |
648 | ||
13882a82 CL |
649 | static void dummy_flush_queue_iso(struct fw_iso_context *ctx) |
650 | { | |
651 | } | |
652 | ||
d1bbd209 CL |
653 | static int dummy_flush_iso_completions(struct fw_iso_context *ctx) |
654 | { | |
655 | return -ENODEV; | |
656 | } | |
657 | ||
d645f4da | 658 | static const struct fw_card_driver dummy_driver_template = { |
20802224 SR |
659 | .read_phy_reg = dummy_read_phy_reg, |
660 | .update_phy_reg = dummy_update_phy_reg, | |
661 | .send_request = dummy_send_request, | |
662 | .send_response = dummy_send_response, | |
663 | .cancel_packet = dummy_cancel_packet, | |
664 | .enable_phys_dma = dummy_enable_phys_dma, | |
665 | .allocate_iso_context = dummy_allocate_iso_context, | |
666 | .start_iso = dummy_start_iso, | |
667 | .set_iso_channels = dummy_set_iso_channels, | |
668 | .queue_iso = dummy_queue_iso, | |
13882a82 | 669 | .flush_queue_iso = dummy_flush_queue_iso, |
d1bbd209 | 670 | .flush_iso_completions = dummy_flush_iso_completions, |
3038e353 KH |
671 | }; |
672 | ||
53dca511 | 673 | void fw_card_release(struct kref *kref) |
459f7923 SR |
674 | { |
675 | struct fw_card *card = container_of(kref, struct fw_card, kref); | |
676 | ||
677 | complete(&card->done); | |
678 | } | |
fc5f80b1 | 679 | EXPORT_SYMBOL_GPL(fw_card_release); |
459f7923 | 680 | |
53dca511 | 681 | void fw_core_remove_card(struct fw_card *card) |
3038e353 | 682 | { |
d645f4da SR |
683 | struct fw_card_driver dummy_driver = dummy_driver_template; |
684 | ||
ecab4133 MB |
685 | card->driver->update_phy_reg(card, 4, |
686 | PHY_LINK_ACTIVE | PHY_CONTENDER, 0); | |
02d37bed | 687 | fw_schedule_bus_reset(card, false, true); |
3038e353 | 688 | |
6a5033be | 689 | mutex_lock(&card_mutex); |
e747a5c0 | 690 | list_del_init(&card->link); |
6a5033be | 691 | mutex_unlock(&card_mutex); |
3038e353 | 692 | |
d645f4da SR |
693 | /* Switch off most of the card driver interface. */ |
694 | dummy_driver.free_iso_context = card->driver->free_iso_context; | |
695 | dummy_driver.stop_iso = card->driver->stop_iso; | |
3038e353 KH |
696 | card->driver = &dummy_driver; |
697 | ||
3038e353 | 698 | fw_destroy_nodes(card); |
459f7923 SR |
699 | |
700 | /* Wait for all users, especially device workqueue jobs, to finish. */ | |
701 | fw_card_put(card); | |
702 | wait_for_completion(&card->done); | |
8a2d9ed3 | 703 | |
1e8afea1 | 704 | WARN_ON(!list_empty(&card->transaction_list)); |
3038e353 KH |
705 | } |
706 | EXPORT_SYMBOL(fw_core_remove_card); |