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 static __be32 tmp_config_rom[256];
74 #define BIB_CRC(v) ((v) << 0)
75 #define BIB_CRC_LENGTH(v) ((v) << 16)
76 #define BIB_INFO_LENGTH(v) ((v) << 24)
78 #define BIB_LINK_SPEED(v) ((v) << 0)
79 #define BIB_GENERATION(v) ((v) << 4)
80 #define BIB_MAX_ROM(v) ((v) << 8)
81 #define BIB_MAX_RECEIVE(v) ((v) << 12)
82 #define BIB_CYC_CLK_ACC(v) ((v) << 16)
83 #define BIB_PMC ((1) << 27)
84 #define BIB_BMC ((1) << 28)
85 #define BIB_ISC ((1) << 29)
86 #define BIB_CMC ((1) << 30)
87 #define BIB_IMC ((1) << 31)
89 static size_t generate_config_rom(struct fw_card *card, __be32 *config_rom)
91 struct fw_descriptor *desc;
95 * Initialize contents of config rom buffer. On the OHCI
96 * controller, block reads to the config rom accesses the host
97 * memory, but quadlet read access the hardware bus info block
98 * registers. That's just crack, but it means we should make
99 * sure the contents of bus info block in host memory matches
100 * the version stored in the OHCI registers.
103 config_rom[0] = cpu_to_be32(
104 BIB_CRC_LENGTH(4) | BIB_INFO_LENGTH(4) | BIB_CRC(0));
105 config_rom[1] = cpu_to_be32(0x31333934);
106 config_rom[2] = cpu_to_be32(
107 BIB_LINK_SPEED(card->link_speed) |
108 BIB_GENERATION(card->config_rom_generation++ % 14 + 2) |
110 BIB_MAX_RECEIVE(card->max_receive) |
111 BIB_BMC | BIB_ISC | BIB_CMC | BIB_IMC);
112 config_rom[3] = cpu_to_be32(card->guid >> 32);
113 config_rom[4] = cpu_to_be32(card->guid);
115 /* Generate root directory. */
116 config_rom[6] = cpu_to_be32(0x0c0083c0); /* node capabilities */
118 j = 7 + descriptor_count;
120 /* Generate root directory entries for descriptors. */
121 list_for_each_entry (desc, &descriptor_list, link) {
122 if (desc->immediate > 0)
123 config_rom[i++] = cpu_to_be32(desc->immediate);
124 config_rom[i] = cpu_to_be32(desc->key | (j - i));
129 /* Update root directory length. */
130 config_rom[5] = cpu_to_be32((i - 5 - 1) << 16);
132 /* End of root directory, now copy in descriptors. */
133 list_for_each_entry (desc, &descriptor_list, link) {
134 for (k = 0; k < desc->length; k++)
135 config_rom[i + k] = cpu_to_be32(desc->data[k]);
139 /* Calculate CRCs for all blocks in the config rom. This
140 * assumes that CRC length and info length are identical for
141 * the bus info block, which is always the case for this
143 for (i = 0; i < j; i += length + 1)
144 length = __compute_block_crc(config_rom + i);
149 static void update_config_roms(void)
151 struct fw_card *card;
154 list_for_each_entry (card, &card_list, link) {
155 length = generate_config_rom(card, tmp_config_rom);
156 card->driver->set_config_rom(card, tmp_config_rom, length);
160 int fw_core_add_descriptor(struct fw_descriptor *desc)
165 * Check descriptor is valid; the length of all blocks in the
166 * descriptor has to add up to exactly the length of the
170 while (i < desc->length)
171 i += (desc->data[i] >> 16) + 1;
173 if (i != desc->length)
176 mutex_lock(&card_mutex);
178 list_add_tail(&desc->link, &descriptor_list);
180 if (desc->immediate > 0)
182 update_config_roms();
184 mutex_unlock(&card_mutex);
188 EXPORT_SYMBOL(fw_core_add_descriptor);
190 void fw_core_remove_descriptor(struct fw_descriptor *desc)
192 mutex_lock(&card_mutex);
194 list_del(&desc->link);
196 if (desc->immediate > 0)
198 update_config_roms();
200 mutex_unlock(&card_mutex);
202 EXPORT_SYMBOL(fw_core_remove_descriptor);
204 static void allocate_broadcast_channel(struct fw_card *card, int generation)
206 int channel, bandwidth = 0;
208 fw_iso_resource_manage(card, generation, 1ULL << 31, &channel,
209 &bandwidth, true, card->bm_transaction_data);
211 card->broadcast_channel_allocated = true;
212 device_for_each_child(card->device, (void *)(long)generation,
213 fw_device_set_broadcast_channel);
217 static const char gap_count_table[] = {
218 63, 5, 7, 8, 10, 13, 16, 18, 21, 24, 26, 29, 32, 35, 37, 40
221 void fw_schedule_bm_work(struct fw_card *card, unsigned long delay)
224 if (!schedule_delayed_work(&card->work, delay))
228 static void fw_card_bm_work(struct work_struct *work)
230 struct fw_card *card = container_of(work, struct fw_card, work.work);
231 struct fw_device *root_device;
232 struct fw_node *root_node;
234 int root_id, new_root_id, irm_id, local_id;
235 int gap_count, generation, grace, rcode;
236 bool do_reset = false;
237 bool root_device_is_running;
238 bool root_device_is_cmc;
240 spin_lock_irqsave(&card->lock, flags);
242 if (card->local_node == NULL) {
243 spin_unlock_irqrestore(&card->lock, flags);
247 generation = card->generation;
248 root_node = card->root_node;
249 fw_node_get(root_node);
250 root_device = root_node->data;
251 root_device_is_running = root_device &&
252 atomic_read(&root_device->state) == FW_DEVICE_RUNNING;
253 root_device_is_cmc = root_device && root_device->cmc;
254 root_id = root_node->node_id;
255 irm_id = card->irm_node->node_id;
256 local_id = card->local_node->node_id;
258 grace = time_after(jiffies, card->reset_jiffies + DIV_ROUND_UP(HZ, 8));
260 if (is_next_generation(generation, card->bm_generation) ||
261 (card->bm_generation != generation && grace)) {
263 * This first step is to figure out who is IRM and
264 * then try to become bus manager. If the IRM is not
265 * well defined (e.g. does not have an active link
266 * layer or does not responds to our lock request, we
267 * will have to do a little vigilante bus management.
268 * In that case, we do a goto into the gap count logic
269 * so that when we do the reset, we still optimize the
270 * gap count. That could well save a reset in the
274 if (!card->irm_node->link_on) {
275 new_root_id = local_id;
276 fw_notify("IRM has link off, making local node (%02x) root.\n",
281 card->bm_transaction_data[0] = cpu_to_be32(0x3f);
282 card->bm_transaction_data[1] = cpu_to_be32(local_id);
284 spin_unlock_irqrestore(&card->lock, flags);
286 rcode = fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP,
287 irm_id, generation, SCODE_100,
288 CSR_REGISTER_BASE + CSR_BUS_MANAGER_ID,
289 card->bm_transaction_data,
290 sizeof(card->bm_transaction_data));
292 if (rcode == RCODE_GENERATION)
293 /* Another bus reset, BM work has been rescheduled. */
296 if (rcode == RCODE_COMPLETE &&
297 card->bm_transaction_data[0] != cpu_to_be32(0x3f)) {
299 /* Somebody else is BM. Only act as IRM. */
300 if (local_id == irm_id)
301 allocate_broadcast_channel(card, generation);
306 spin_lock_irqsave(&card->lock, flags);
308 if (rcode != RCODE_COMPLETE) {
310 * The lock request failed, maybe the IRM
311 * isn't really IRM capable after all. Let's
312 * do a bus reset and pick the local node as
313 * root, and thus, IRM.
315 new_root_id = local_id;
316 fw_notify("BM lock failed, making local node (%02x) root.\n",
320 } else if (card->bm_generation != generation) {
322 * We weren't BM in the last generation, and the last
323 * bus reset is less than 125ms ago. Reschedule this job.
325 spin_unlock_irqrestore(&card->lock, flags);
326 fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 8));
331 * We're bus manager for this generation, so next step is to
332 * make sure we have an active cycle master and do gap count
335 card->bm_generation = generation;
337 if (root_device == NULL) {
339 * Either link_on is false, or we failed to read the
340 * config rom. In either case, pick another root.
342 new_root_id = local_id;
343 } else if (!root_device_is_running) {
345 * If we haven't probed this device yet, bail out now
346 * and let's try again once that's done.
348 spin_unlock_irqrestore(&card->lock, flags);
350 } else if (root_device_is_cmc) {
352 * FIXME: I suppose we should set the cmstr bit in the
353 * STATE_CLEAR register of this node, as described in
354 * 1394-1995, 8.4.2.6. Also, send out a force root
355 * packet for this node.
357 new_root_id = root_id;
360 * Current root has an active link layer and we
361 * successfully read the config rom, but it's not
362 * cycle master capable.
364 new_root_id = local_id;
369 * Pick a gap count from 1394a table E-1. The table doesn't cover
370 * the typically much larger 1394b beta repeater delays though.
372 if (!card->beta_repeaters_present &&
373 root_node->max_hops < ARRAY_SIZE(gap_count_table))
374 gap_count = gap_count_table[root_node->max_hops];
379 * Finally, figure out if we should do a reset or not. If we have
380 * done less than 5 resets with the same physical topology and we
381 * have either a new root or a new gap count setting, let's do it.
384 if (card->bm_retries++ < 5 &&
385 (card->gap_count != gap_count || new_root_id != root_id))
388 spin_unlock_irqrestore(&card->lock, flags);
391 fw_notify("phy config: card %d, new root=%x, gap_count=%d\n",
392 card->index, new_root_id, gap_count);
393 fw_send_phy_config(card, new_root_id, generation, gap_count);
394 fw_core_initiate_bus_reset(card, 1);
395 /* Will allocate broadcast channel after the reset. */
397 if (local_id == irm_id)
398 allocate_broadcast_channel(card, generation);
402 fw_node_put(root_node);
407 static void flush_timer_callback(unsigned long data)
409 struct fw_card *card = (struct fw_card *)data;
411 fw_flush_transactions(card);
414 void fw_card_initialize(struct fw_card *card,
415 const struct fw_card_driver *driver,
416 struct device *device)
418 static atomic_t index = ATOMIC_INIT(-1);
420 card->index = atomic_inc_return(&index);
421 card->driver = driver;
422 card->device = device;
423 card->current_tlabel = 0;
424 card->tlabel_mask = 0;
426 card->broadcast_channel = BROADCAST_CHANNEL_INITIAL;
428 kref_init(&card->kref);
429 init_completion(&card->done);
430 INIT_LIST_HEAD(&card->transaction_list);
431 spin_lock_init(&card->lock);
432 setup_timer(&card->flush_timer,
433 flush_timer_callback, (unsigned long)card);
435 card->local_node = NULL;
437 INIT_DELAYED_WORK(&card->work, fw_card_bm_work);
439 EXPORT_SYMBOL(fw_card_initialize);
441 int fw_card_add(struct fw_card *card,
442 u32 max_receive, u32 link_speed, u64 guid)
447 card->max_receive = max_receive;
448 card->link_speed = link_speed;
451 mutex_lock(&card_mutex);
453 length = generate_config_rom(card, tmp_config_rom);
454 ret = card->driver->enable(card, tmp_config_rom, length);
456 list_add_tail(&card->link, &card_list);
458 mutex_unlock(&card_mutex);
462 EXPORT_SYMBOL(fw_card_add);
466 * The next few functions implement a dummy driver that is used once a card
467 * driver shuts down an fw_card. This allows the driver to cleanly unload,
468 * as all IO to the card will be handled (and failed) by the dummy driver
469 * instead of calling into the module. Only functions for iso context
470 * shutdown still need to be provided by the card driver.
473 static int dummy_enable(struct fw_card *card,
474 const __be32 *config_rom, size_t length)
480 static int dummy_update_phy_reg(struct fw_card *card, int address,
481 int clear_bits, int set_bits)
486 static int dummy_set_config_rom(struct fw_card *card,
487 const __be32 *config_rom, size_t length)
490 * We take the card out of card_list before setting the dummy
491 * driver, so this should never get called.
497 static void dummy_send_request(struct fw_card *card, struct fw_packet *packet)
499 packet->callback(packet, card, -ENODEV);
502 static void dummy_send_response(struct fw_card *card, struct fw_packet *packet)
504 packet->callback(packet, card, -ENODEV);
507 static int dummy_cancel_packet(struct fw_card *card, struct fw_packet *packet)
512 static int dummy_enable_phys_dma(struct fw_card *card,
513 int node_id, int generation)
518 static const struct fw_card_driver dummy_driver_template = {
519 .enable = dummy_enable,
520 .update_phy_reg = dummy_update_phy_reg,
521 .set_config_rom = dummy_set_config_rom,
522 .send_request = dummy_send_request,
523 .cancel_packet = dummy_cancel_packet,
524 .send_response = dummy_send_response,
525 .enable_phys_dma = dummy_enable_phys_dma,
528 void fw_card_release(struct kref *kref)
530 struct fw_card *card = container_of(kref, struct fw_card, kref);
532 complete(&card->done);
535 void fw_core_remove_card(struct fw_card *card)
537 struct fw_card_driver dummy_driver = dummy_driver_template;
539 card->driver->update_phy_reg(card, 4,
540 PHY_LINK_ACTIVE | PHY_CONTENDER, 0);
541 fw_core_initiate_bus_reset(card, 1);
543 mutex_lock(&card_mutex);
544 list_del_init(&card->link);
545 mutex_unlock(&card_mutex);
547 /* Switch off most of the card driver interface. */
548 dummy_driver.free_iso_context = card->driver->free_iso_context;
549 dummy_driver.stop_iso = card->driver->stop_iso;
550 card->driver = &dummy_driver;
552 fw_destroy_nodes(card);
554 /* Wait for all users, especially device workqueue jobs, to finish. */
556 wait_for_completion(&card->done);
558 WARN_ON(!list_empty(&card->transaction_list));
559 del_timer_sync(&card->flush_timer);
561 EXPORT_SYMBOL(fw_core_remove_card);
563 int fw_core_initiate_bus_reset(struct fw_card *card, int short_reset)
565 int reg = short_reset ? 5 : 1;
566 int bit = short_reset ? PHY_BUS_SHORT_RESET : PHY_BUS_RESET;
568 return card->driver->update_phy_reg(card, reg, 0, bit);
570 EXPORT_SYMBOL(fw_core_initiate_bus_reset);