1 /* -*- c-basic-offset: 8 -*-
3 * fw-card.c - card level functions
5 * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software Foundation,
19 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 #include <linux/module.h>
23 #include <linux/errno.h>
24 #include <linux/device.h>
25 #include <linux/rwsem.h>
26 #include <linux/crc-itu-t.h>
27 #include "fw-transaction.h"
28 #include "fw-topology.h"
29 #include "fw-device.h"
31 int fw_compute_block_crc(u32 *block)
33 __be32 be32_block[256];
36 length = (*block >> 16) & 0xff;
37 for (i = 0; i < length; i++)
38 be32_block[i] = cpu_to_be32(block[i + 1]);
39 *block |= crc_itu_t(0, (u8 *) be32_block, length * 4);
44 static DECLARE_RWSEM(card_rwsem);
45 static LIST_HEAD(card_list);
47 static LIST_HEAD(descriptor_list);
48 static int descriptor_count;
50 #define bib_crc(v) ((v) << 0)
51 #define bib_crc_length(v) ((v) << 16)
52 #define bib_info_length(v) ((v) << 24)
54 #define bib_link_speed(v) ((v) << 0)
55 #define bib_generation(v) ((v) << 4)
56 #define bib_max_rom(v) ((v) << 8)
57 #define bib_max_receive(v) ((v) << 12)
58 #define bib_cyc_clk_acc(v) ((v) << 16)
59 #define bib_pmc ((1) << 27)
60 #define bib_bmc ((1) << 28)
61 #define bib_isc ((1) << 29)
62 #define bib_cmc ((1) << 30)
63 #define bib_imc ((1) << 31)
66 generate_config_rom (struct fw_card *card, size_t *config_rom_length)
68 struct fw_descriptor *desc;
69 static u32 config_rom[256];
72 /* Initialize contents of config rom buffer. On the OHCI
73 * controller, block reads to the config rom accesses the host
74 * memory, but quadlet read access the hardware bus info block
75 * registers. That's just crack, but it means we should make
76 * sure the contents of bus info block in host memory mathces
77 * the version stored in the OHCI registers. */
79 memset(config_rom, 0, sizeof config_rom);
80 config_rom[0] = bib_crc_length(4) | bib_info_length(4) | bib_crc(0);
81 config_rom[1] = 0x31333934;
84 bib_link_speed(card->link_speed) |
85 bib_generation(card->config_rom_generation++ % 14 + 2) |
87 bib_max_receive(card->max_receive) |
88 bib_bmc | bib_isc | bib_cmc | bib_imc;
89 config_rom[3] = card->guid >> 32;
90 config_rom[4] = card->guid;
92 /* Generate root directory. */
95 config_rom[i++] = 0x0c0083c0; /* node capabilities */
96 j = i + descriptor_count;
98 /* Generate root directory entries for descriptors. */
99 list_for_each_entry (desc, &descriptor_list, link) {
100 if (desc->immediate > 0)
101 config_rom[i++] = desc->immediate;
102 config_rom[i] = desc->key | (j - i);
107 /* Update root directory length. */
108 config_rom[5] = (i - 5 - 1) << 16;
110 /* End of root directory, now copy in descriptors. */
111 list_for_each_entry (desc, &descriptor_list, link) {
112 memcpy(&config_rom[i], desc->data, desc->length * 4);
116 /* Calculate CRCs for all blocks in the config rom. This
117 * assumes that CRC length and info length are identical for
118 * the bus info block, which is always the case for this
120 for (i = 0; i < j; i += length + 1)
121 length = fw_compute_block_crc(config_rom + i);
123 *config_rom_length = j;
129 update_config_roms (void)
131 struct fw_card *card;
135 list_for_each_entry (card, &card_list, link) {
136 config_rom = generate_config_rom(card, &length);
137 card->driver->set_config_rom(card, config_rom, length);
142 fw_core_add_descriptor (struct fw_descriptor *desc)
146 /* Check descriptor is valid; the length of all blocks in the
147 * descriptor has to add up to exactly the length of the
150 while (i < desc->length)
151 i += (desc->data[i] >> 16) + 1;
153 if (i != desc->length)
156 down_write(&card_rwsem);
158 list_add_tail (&desc->link, &descriptor_list);
160 if (desc->immediate > 0)
162 update_config_roms();
164 up_write(&card_rwsem);
168 EXPORT_SYMBOL(fw_core_add_descriptor);
171 fw_core_remove_descriptor (struct fw_descriptor *desc)
173 down_write(&card_rwsem);
175 list_del(&desc->link);
177 if (desc->immediate > 0)
179 update_config_roms();
181 up_write(&card_rwsem);
183 EXPORT_SYMBOL(fw_core_remove_descriptor);
185 static const char gap_count_table[] = {
186 63, 5, 7, 8, 10, 13, 16, 18, 21, 24, 26, 29, 32, 35, 37, 40
190 struct fw_transaction t;
197 struct completion done;
201 complete_bm_lock(struct fw_card *card, int rcode,
202 void *payload, size_t length, void *data)
204 struct bm_data *bmd = data;
206 if (rcode == RCODE_COMPLETE)
207 bmd->old = be32_to_cpu(*(__be32 *) payload);
209 complete(&bmd->done);
213 fw_card_bm_work(struct work_struct *work)
215 struct fw_card *card = container_of(work, struct fw_card, work.work);
216 struct fw_device *root;
219 int root_id, new_root_id, irm_id, gap_count, generation, grace;
222 spin_lock_irqsave(&card->lock, flags);
224 generation = card->generation;
225 root = card->root_node->data;
226 root_id = card->root_node->node_id;
227 grace = time_after(jiffies, card->reset_jiffies + DIV_ROUND_UP(HZ, 10));
229 if (card->bm_generation + 1 == generation ||
230 (card->bm_generation != generation && grace)) {
231 /* This first step is to figure out who is IRM and
232 * then try to become bus manager. If the IRM is not
233 * well defined (e.g. does not have an active link
234 * layer or does not responds to our lock request, we
235 * will have to do a little vigilante bus management.
236 * In that case, we do a goto into the gap count logic
237 * so that when we do the reset, we still optimize the
238 * gap count. That could well save a reset in the
239 * next generation. */
241 irm_id = card->irm_node->node_id;
242 if (!card->irm_node->link_on) {
243 new_root_id = card->local_node->node_id;
244 fw_notify("IRM has link off, making local node (%02x) root.\n",
249 bmd.lock.arg = cpu_to_be32(0x3f);
250 bmd.lock.data = cpu_to_be32(card->local_node->node_id);
252 spin_unlock_irqrestore(&card->lock, flags);
254 init_completion(&bmd.done);
255 fw_send_request(card, &bmd.t, TCODE_LOCK_COMPARE_SWAP,
257 SCODE_100, CSR_REGISTER_BASE + CSR_BUS_MANAGER_ID,
258 &bmd.lock, sizeof bmd.lock,
259 complete_bm_lock, &bmd);
260 wait_for_completion(&bmd.done);
262 if (bmd.rcode == RCODE_GENERATION) {
263 /* Another bus reset happened. Just return,
264 * the BM work has been rescheduled. */
268 if (bmd.rcode == RCODE_COMPLETE && bmd.old != 0x3f)
269 /* Somebody else is BM, let them do the work. */
272 spin_lock_irqsave(&card->lock, flags);
273 if (bmd.rcode != RCODE_COMPLETE) {
274 /* The lock request failed, maybe the IRM
275 * isn't really IRM capable after all. Let's
276 * do a bus reset and pick the local node as
277 * root, and thus, IRM. */
278 new_root_id = card->local_node->node_id;
279 fw_notify("BM lock failed, making local node (%02x) root.\n",
283 } else if (card->bm_generation != generation) {
284 /* OK, we weren't BM in the last generation, and it's
285 * less than 100ms since last bus reset. Reschedule
286 * this task 100ms from now. */
287 spin_unlock_irqrestore(&card->lock, flags);
288 schedule_delayed_work(&card->work, DIV_ROUND_UP(HZ, 10));
292 /* We're bus manager for this generation, so next step is to
293 * make sure we have an active cycle master and do gap count
295 card->bm_generation = generation;
298 /* Either link_on is false, or we failed to read the
299 * config rom. In either case, pick another root. */
300 new_root_id = card->local_node->node_id;
301 } else if (atomic_read(&root->state) != FW_DEVICE_RUNNING) {
302 /* If we haven't probed this device yet, bail out now
303 * and let's try again once that's done. */
304 spin_unlock_irqrestore(&card->lock, flags);
306 } else if (root->config_rom[2] & bib_cmc) {
307 /* FIXME: I suppose we should set the cmstr bit in the
308 * STATE_CLEAR register of this node, as described in
309 * 1394-1995, 8.4.2.6. Also, send out a force root
310 * packet for this node. */
311 new_root_id = root_id;
313 /* Current root has an active link layer and we
314 * successfully read the config rom, but it's not
315 * cycle master capable. */
316 new_root_id = card->local_node->node_id;
320 /* Now figure out what gap count to set. */
321 if (card->topology_type == FW_TOPOLOGY_A &&
322 card->root_node->max_hops < ARRAY_SIZE(gap_count_table))
323 gap_count = gap_count_table[card->root_node->max_hops];
327 /* Finally, figure out if we should do a reset or not. If we've
328 * done less that 5 resets with the same physical topology and we
329 * have either a new root or a new gap count setting, let's do it. */
331 if (card->bm_retries++ < 5 &&
332 (card->gap_count != gap_count || new_root_id != root_id))
335 spin_unlock_irqrestore(&card->lock, flags);
338 fw_notify("phy config: card %d, new root=%x, gap_count=%d\n",
339 card->index, new_root_id, gap_count);
340 fw_send_phy_config(card, new_root_id, generation, gap_count);
341 fw_core_initiate_bus_reset(card, 1);
346 flush_timer_callback(unsigned long data)
348 struct fw_card *card = (struct fw_card *)data;
350 fw_flush_transactions(card);
354 fw_card_initialize(struct fw_card *card, const struct fw_card_driver *driver,
355 struct device *device)
357 static atomic_t index = ATOMIC_INIT(-1);
359 kref_init(&card->kref);
360 card->index = atomic_inc_return(&index);
361 card->driver = driver;
362 card->device = device;
363 card->current_tlabel = 0;
364 card->tlabel_mask = 0;
367 INIT_LIST_HEAD(&card->transaction_list);
368 spin_lock_init(&card->lock);
369 setup_timer(&card->flush_timer,
370 flush_timer_callback, (unsigned long)card);
372 card->local_node = NULL;
374 INIT_DELAYED_WORK(&card->work, fw_card_bm_work);
376 EXPORT_SYMBOL(fw_card_initialize);
379 fw_card_add(struct fw_card *card,
380 u32 max_receive, u32 link_speed, u64 guid)
385 card->max_receive = max_receive;
386 card->link_speed = link_speed;
389 /* Activate link_on bit and contender bit in our self ID packets.*/
390 if (card->driver->update_phy_reg(card, 4, 0,
391 PHY_LINK_ACTIVE | PHY_CONTENDER) < 0)
394 /* The subsystem grabs a reference when the card is added and
395 * drops it when the driver calls fw_core_remove_card. */
398 down_write(&card_rwsem);
399 config_rom = generate_config_rom (card, &length);
400 list_add_tail(&card->link, &card_list);
401 up_write(&card_rwsem);
403 return card->driver->enable(card, config_rom, length);
405 EXPORT_SYMBOL(fw_card_add);
408 /* The next few functions implements a dummy driver that use once a
409 * card driver shuts down an fw_card. This allows the driver to
410 * cleanly unload, as all IO to the card will be handled by the dummy
411 * driver instead of calling into the (possibly) unloaded module. The
412 * dummy driver just fails all IO. */
415 dummy_enable(struct fw_card *card, u32 *config_rom, size_t length)
422 dummy_update_phy_reg(struct fw_card *card, int address,
423 int clear_bits, int set_bits)
429 dummy_set_config_rom(struct fw_card *card,
430 u32 *config_rom, size_t length)
432 /* We take the card out of card_list before setting the dummy
433 * driver, so this should never get called. */
439 dummy_send_request(struct fw_card *card, struct fw_packet *packet)
441 packet->callback(packet, card, -ENODEV);
445 dummy_send_response(struct fw_card *card, struct fw_packet *packet)
447 packet->callback(packet, card, -ENODEV);
451 dummy_cancel_packet(struct fw_card *card, struct fw_packet *packet)
457 dummy_enable_phys_dma(struct fw_card *card,
458 int node_id, int generation)
463 static struct fw_card_driver dummy_driver = {
465 .enable = dummy_enable,
466 .update_phy_reg = dummy_update_phy_reg,
467 .set_config_rom = dummy_set_config_rom,
468 .send_request = dummy_send_request,
469 .cancel_packet = dummy_cancel_packet,
470 .send_response = dummy_send_response,
471 .enable_phys_dma = dummy_enable_phys_dma,
475 fw_core_remove_card(struct fw_card *card)
477 card->driver->update_phy_reg(card, 4,
478 PHY_LINK_ACTIVE | PHY_CONTENDER, 0);
479 fw_core_initiate_bus_reset(card, 1);
481 down_write(&card_rwsem);
482 list_del(&card->link);
483 up_write(&card_rwsem);
485 /* Set up the dummy driver. */
486 card->driver = &dummy_driver;
488 fw_flush_transactions(card);
490 fw_destroy_nodes(card);
494 EXPORT_SYMBOL(fw_core_remove_card);
497 fw_card_get(struct fw_card *card)
499 kref_get(&card->kref);
503 EXPORT_SYMBOL(fw_card_get);
506 release_card(struct kref *kref)
508 struct fw_card *card = container_of(kref, struct fw_card, kref);
513 /* An assumption for fw_card_put() is that the card driver allocates
514 * the fw_card struct with kalloc and that it has been shut down
515 * before the last ref is dropped. */
517 fw_card_put(struct fw_card *card)
519 kref_put(&card->kref, release_card);
521 EXPORT_SYMBOL(fw_card_put);
524 fw_core_initiate_bus_reset(struct fw_card *card, int short_reset)
526 int reg = short_reset ? 5 : 1;
527 /* The following values happen to be the same bit. However be
528 * explicit for clarity. */
529 int bit = short_reset ? PHY_BUS_SHORT_RESET : PHY_BUS_RESET;
531 return card->driver->update_phy_reg(card, reg, 0, bit);
533 EXPORT_SYMBOL(fw_core_initiate_bus_reset);