2 * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net>
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.
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.
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.
19 #include <linux/bug.h>
20 #include <linux/completion.h>
21 #include <linux/crc-itu-t.h>
22 #include <linux/device.h>
23 #include <linux/errno.h>
24 #include <linux/firewire.h>
25 #include <linux/firewire-constants.h>
26 #include <linux/jiffies.h>
27 #include <linux/kernel.h>
28 #include <linux/kref.h>
29 #include <linux/list.h>
30 #include <linux/module.h>
31 #include <linux/mutex.h>
32 #include <linux/spinlock.h>
33 #include <linux/timer.h>
34 #include <linux/workqueue.h>
36 #include <asm/atomic.h>
37 #include <asm/byteorder.h>
41 static int __compute_block_crc(__be32 *block)
46 length = (be32_to_cpu(block[0]) >> 16) & 0xff;
47 crc = crc_itu_t(0, (u8 *)&block[1], length * 4);
48 *block |= cpu_to_be32(crc);
53 int fw_compute_block_crc(u32 *block)
55 __be32 be32_block[256];
58 length = (*block >> 16) & 0xff;
59 for (i = 0; i < length; i++)
60 be32_block[i] = cpu_to_be32(block[i + 1]);
61 *block |= crc_itu_t(0, (u8 *) be32_block, length * 4);
66 static DEFINE_MUTEX(card_mutex);
67 static LIST_HEAD(card_list);
69 static LIST_HEAD(descriptor_list);
70 static int descriptor_count;
72 #define BIB_CRC(v) ((v) << 0)
73 #define BIB_CRC_LENGTH(v) ((v) << 16)
74 #define BIB_INFO_LENGTH(v) ((v) << 24)
76 #define BIB_LINK_SPEED(v) ((v) << 0)
77 #define BIB_GENERATION(v) ((v) << 4)
78 #define BIB_MAX_ROM(v) ((v) << 8)
79 #define BIB_MAX_RECEIVE(v) ((v) << 12)
80 #define BIB_CYC_CLK_ACC(v) ((v) << 16)
81 #define BIB_PMC ((1) << 27)
82 #define BIB_BMC ((1) << 28)
83 #define BIB_ISC ((1) << 29)
84 #define BIB_CMC ((1) << 30)
85 #define BIB_IMC ((1) << 31)
87 static __be32 *generate_config_rom(struct fw_card *card, size_t *rom_length)
89 struct fw_descriptor *desc;
90 static __be32 config_rom[256];
94 * Initialize contents of config rom buffer. On the OHCI
95 * controller, block reads to the config rom accesses the host
96 * memory, but quadlet read access the hardware bus info block
97 * registers. That's just crack, but it means we should make
98 * sure the contents of bus info block in host memory matches
99 * the version stored in the OHCI registers.
102 config_rom[0] = cpu_to_be32(
103 BIB_CRC_LENGTH(4) | BIB_INFO_LENGTH(4) | BIB_CRC(0));
104 config_rom[1] = cpu_to_be32(0x31333934);
105 config_rom[2] = cpu_to_be32(
106 BIB_LINK_SPEED(card->link_speed) |
107 BIB_GENERATION(card->config_rom_generation++ % 14 + 2) |
109 BIB_MAX_RECEIVE(card->max_receive) |
110 BIB_BMC | BIB_ISC | BIB_CMC | BIB_IMC);
111 config_rom[3] = cpu_to_be32(card->guid >> 32);
112 config_rom[4] = cpu_to_be32(card->guid);
114 /* Generate root directory. */
115 config_rom[6] = cpu_to_be32(0x0c0083c0); /* node capabilities */
117 j = 7 + descriptor_count;
119 /* Generate root directory entries for descriptors. */
120 list_for_each_entry (desc, &descriptor_list, link) {
121 if (desc->immediate > 0)
122 config_rom[i++] = cpu_to_be32(desc->immediate);
123 config_rom[i] = cpu_to_be32(desc->key | (j - i));
128 /* Update root directory length. */
129 config_rom[5] = cpu_to_be32((i - 5 - 1) << 16);
131 /* End of root directory, now copy in descriptors. */
132 list_for_each_entry (desc, &descriptor_list, link) {
133 for (k = 0; k < desc->length; k++)
134 config_rom[i + k] = cpu_to_be32(desc->data[k]);
138 /* Calculate CRCs for all blocks in the config rom. This
139 * assumes that CRC length and info length are identical for
140 * the bus info block, which is always the case for this
142 for (i = 0; i < j; i += length + 1)
143 length = __compute_block_crc(config_rom + i);
150 static void update_config_roms(void)
152 struct fw_card *card;
156 list_for_each_entry (card, &card_list, link) {
157 config_rom = generate_config_rom(card, &length);
158 card->driver->set_config_rom(card, config_rom, length);
162 int fw_core_add_descriptor(struct fw_descriptor *desc)
167 * Check descriptor is valid; the length of all blocks in the
168 * descriptor has to add up to exactly the length of the
172 while (i < desc->length)
173 i += (desc->data[i] >> 16) + 1;
175 if (i != desc->length)
178 mutex_lock(&card_mutex);
180 list_add_tail(&desc->link, &descriptor_list);
182 if (desc->immediate > 0)
184 update_config_roms();
186 mutex_unlock(&card_mutex);
190 EXPORT_SYMBOL(fw_core_add_descriptor);
192 void fw_core_remove_descriptor(struct fw_descriptor *desc)
194 mutex_lock(&card_mutex);
196 list_del(&desc->link);
198 if (desc->immediate > 0)
200 update_config_roms();
202 mutex_unlock(&card_mutex);
204 EXPORT_SYMBOL(fw_core_remove_descriptor);
206 static void allocate_broadcast_channel(struct fw_card *card, int generation)
208 int channel, bandwidth = 0;
210 fw_iso_resource_manage(card, generation, 1ULL << 31, &channel,
211 &bandwidth, true, card->bm_transaction_data);
213 card->broadcast_channel_allocated = true;
214 device_for_each_child(card->device, (void *)(long)generation,
215 fw_device_set_broadcast_channel);
219 static const char gap_count_table[] = {
220 63, 5, 7, 8, 10, 13, 16, 18, 21, 24, 26, 29, 32, 35, 37, 40
223 void fw_schedule_bm_work(struct fw_card *card, unsigned long delay)
226 if (!schedule_delayed_work(&card->work, delay))
230 static void fw_card_bm_work(struct work_struct *work)
232 struct fw_card *card = container_of(work, struct fw_card, work.work);
233 struct fw_device *root_device;
234 struct fw_node *root_node;
236 int root_id, new_root_id, irm_id, local_id;
237 int gap_count, generation, grace, rcode;
238 bool do_reset = false;
239 bool root_device_is_running;
240 bool root_device_is_cmc;
242 spin_lock_irqsave(&card->lock, flags);
244 if (card->local_node == NULL) {
245 spin_unlock_irqrestore(&card->lock, flags);
249 generation = card->generation;
250 root_node = card->root_node;
251 fw_node_get(root_node);
252 root_device = root_node->data;
253 root_device_is_running = root_device &&
254 atomic_read(&root_device->state) == FW_DEVICE_RUNNING;
255 root_device_is_cmc = root_device && root_device->cmc;
256 root_id = root_node->node_id;
257 irm_id = card->irm_node->node_id;
258 local_id = card->local_node->node_id;
260 grace = time_after(jiffies, card->reset_jiffies + DIV_ROUND_UP(HZ, 8));
262 if (is_next_generation(generation, card->bm_generation) ||
263 (card->bm_generation != generation && grace)) {
265 * This first step is to figure out who is IRM and
266 * then try to become bus manager. If the IRM is not
267 * well defined (e.g. does not have an active link
268 * layer or does not responds to our lock request, we
269 * will have to do a little vigilante bus management.
270 * In that case, we do a goto into the gap count logic
271 * so that when we do the reset, we still optimize the
272 * gap count. That could well save a reset in the
276 if (!card->irm_node->link_on) {
277 new_root_id = local_id;
278 fw_notify("IRM has link off, making local node (%02x) root.\n",
283 card->bm_transaction_data[0] = cpu_to_be32(0x3f);
284 card->bm_transaction_data[1] = cpu_to_be32(local_id);
286 spin_unlock_irqrestore(&card->lock, flags);
288 rcode = fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP,
289 irm_id, generation, SCODE_100,
290 CSR_REGISTER_BASE + CSR_BUS_MANAGER_ID,
291 card->bm_transaction_data,
292 sizeof(card->bm_transaction_data));
294 if (rcode == RCODE_GENERATION)
295 /* Another bus reset, BM work has been rescheduled. */
298 if (rcode == RCODE_COMPLETE &&
299 card->bm_transaction_data[0] != cpu_to_be32(0x3f)) {
301 /* Somebody else is BM. Only act as IRM. */
302 if (local_id == irm_id)
303 allocate_broadcast_channel(card, generation);
308 spin_lock_irqsave(&card->lock, flags);
310 if (rcode != RCODE_COMPLETE) {
312 * The lock request failed, maybe the IRM
313 * isn't really IRM capable after all. Let's
314 * do a bus reset and pick the local node as
315 * root, and thus, IRM.
317 new_root_id = local_id;
318 fw_notify("BM lock failed, making local node (%02x) root.\n",
322 } else if (card->bm_generation != generation) {
324 * We weren't BM in the last generation, and the last
325 * bus reset is less than 125ms ago. Reschedule this job.
327 spin_unlock_irqrestore(&card->lock, flags);
328 fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 8));
333 * We're bus manager for this generation, so next step is to
334 * make sure we have an active cycle master and do gap count
337 card->bm_generation = generation;
339 if (root_device == NULL) {
341 * Either link_on is false, or we failed to read the
342 * config rom. In either case, pick another root.
344 new_root_id = local_id;
345 } else if (!root_device_is_running) {
347 * If we haven't probed this device yet, bail out now
348 * and let's try again once that's done.
350 spin_unlock_irqrestore(&card->lock, flags);
352 } else if (root_device_is_cmc) {
354 * FIXME: I suppose we should set the cmstr bit in the
355 * STATE_CLEAR register of this node, as described in
356 * 1394-1995, 8.4.2.6. Also, send out a force root
357 * packet for this node.
359 new_root_id = root_id;
362 * Current root has an active link layer and we
363 * successfully read the config rom, but it's not
364 * cycle master capable.
366 new_root_id = local_id;
371 * Pick a gap count from 1394a table E-1. The table doesn't cover
372 * the typically much larger 1394b beta repeater delays though.
374 if (!card->beta_repeaters_present &&
375 root_node->max_hops < ARRAY_SIZE(gap_count_table))
376 gap_count = gap_count_table[root_node->max_hops];
381 * Finally, figure out if we should do a reset or not. If we have
382 * done less than 5 resets with the same physical topology and we
383 * have either a new root or a new gap count setting, let's do it.
386 if (card->bm_retries++ < 5 &&
387 (card->gap_count != gap_count || new_root_id != root_id))
390 spin_unlock_irqrestore(&card->lock, flags);
393 fw_notify("phy config: card %d, new root=%x, gap_count=%d\n",
394 card->index, new_root_id, gap_count);
395 fw_send_phy_config(card, new_root_id, generation, gap_count);
396 fw_core_initiate_bus_reset(card, 1);
397 /* Will allocate broadcast channel after the reset. */
399 if (local_id == irm_id)
400 allocate_broadcast_channel(card, generation);
404 fw_node_put(root_node);
409 static void flush_timer_callback(unsigned long data)
411 struct fw_card *card = (struct fw_card *)data;
413 fw_flush_transactions(card);
416 void fw_card_initialize(struct fw_card *card,
417 const struct fw_card_driver *driver,
418 struct device *device)
420 static atomic_t index = ATOMIC_INIT(-1);
422 card->index = atomic_inc_return(&index);
423 card->driver = driver;
424 card->device = device;
425 card->current_tlabel = 0;
426 card->tlabel_mask = 0;
428 card->broadcast_channel = BROADCAST_CHANNEL_INITIAL;
430 kref_init(&card->kref);
431 init_completion(&card->done);
432 INIT_LIST_HEAD(&card->transaction_list);
433 spin_lock_init(&card->lock);
434 setup_timer(&card->flush_timer,
435 flush_timer_callback, (unsigned long)card);
437 card->local_node = NULL;
439 INIT_DELAYED_WORK(&card->work, fw_card_bm_work);
441 EXPORT_SYMBOL(fw_card_initialize);
443 int fw_card_add(struct fw_card *card,
444 u32 max_receive, u32 link_speed, u64 guid)
450 card->max_receive = max_receive;
451 card->link_speed = link_speed;
454 mutex_lock(&card_mutex);
456 config_rom = generate_config_rom(card, &length);
457 ret = card->driver->enable(card, config_rom, length);
459 list_add_tail(&card->link, &card_list);
461 mutex_unlock(&card_mutex);
465 EXPORT_SYMBOL(fw_card_add);
469 * The next few functions implement a dummy driver that is used once a card
470 * driver shuts down an fw_card. This allows the driver to cleanly unload,
471 * as all IO to the card will be handled (and failed) by the dummy driver
472 * instead of calling into the module. Only functions for iso context
473 * shutdown still need to be provided by the card driver.
476 static int dummy_enable(struct fw_card *card,
477 const __be32 *config_rom, size_t length)
483 static int dummy_update_phy_reg(struct fw_card *card, int address,
484 int clear_bits, int set_bits)
489 static int dummy_set_config_rom(struct fw_card *card,
490 const __be32 *config_rom, size_t length)
493 * We take the card out of card_list before setting the dummy
494 * driver, so this should never get called.
500 static void dummy_send_request(struct fw_card *card, struct fw_packet *packet)
502 packet->callback(packet, card, -ENODEV);
505 static void dummy_send_response(struct fw_card *card, struct fw_packet *packet)
507 packet->callback(packet, card, -ENODEV);
510 static int dummy_cancel_packet(struct fw_card *card, struct fw_packet *packet)
515 static int dummy_enable_phys_dma(struct fw_card *card,
516 int node_id, int generation)
521 static const struct fw_card_driver dummy_driver_template = {
522 .enable = dummy_enable,
523 .update_phy_reg = dummy_update_phy_reg,
524 .set_config_rom = dummy_set_config_rom,
525 .send_request = dummy_send_request,
526 .cancel_packet = dummy_cancel_packet,
527 .send_response = dummy_send_response,
528 .enable_phys_dma = dummy_enable_phys_dma,
531 void fw_card_release(struct kref *kref)
533 struct fw_card *card = container_of(kref, struct fw_card, kref);
535 complete(&card->done);
538 void fw_core_remove_card(struct fw_card *card)
540 struct fw_card_driver dummy_driver = dummy_driver_template;
542 card->driver->update_phy_reg(card, 4,
543 PHY_LINK_ACTIVE | PHY_CONTENDER, 0);
544 fw_core_initiate_bus_reset(card, 1);
546 mutex_lock(&card_mutex);
547 list_del_init(&card->link);
548 mutex_unlock(&card_mutex);
550 /* Switch off most of the card driver interface. */
551 dummy_driver.free_iso_context = card->driver->free_iso_context;
552 dummy_driver.stop_iso = card->driver->stop_iso;
553 card->driver = &dummy_driver;
555 fw_destroy_nodes(card);
557 /* Wait for all users, especially device workqueue jobs, to finish. */
559 wait_for_completion(&card->done);
561 WARN_ON(!list_empty(&card->transaction_list));
562 del_timer_sync(&card->flush_timer);
564 EXPORT_SYMBOL(fw_core_remove_card);
566 int fw_core_initiate_bus_reset(struct fw_card *card, int short_reset)
568 int reg = short_reset ? 5 : 1;
569 int bit = short_reset ? PHY_BUS_SHORT_RESET : PHY_BUS_RESET;
571 return card->driver->update_phy_reg(card, reg, 0, bit);
573 EXPORT_SYMBOL(fw_core_initiate_bus_reset);