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 "fw-transaction.h"
26 #include "fw-topology.h"
27 #include "fw-device.h"
29 /* The lib/crc16.c implementation uses the standard (0x8005)
30 * polynomial, but we need the ITU-T (or CCITT) polynomial (0x1021).
31 * The implementation below works on an array of host-endian u32
32 * words, assuming they'll be transmited msb first. */
34 crc16_itu_t(const u32
*buffer
, size_t length
)
40 for (i
= 0; i
< length
; i
++) {
42 for (shift
= 28; shift
>= 0; shift
-= 4 ) {
43 sum
= ((crc
>> 12) ^ (data
>> shift
)) & 0xf;
44 crc
= (crc
<< 4) ^ (sum
<< 12) ^ (sum
<< 5) ^ (sum
);
52 static LIST_HEAD(card_list
);
54 static LIST_HEAD(descriptor_list
);
55 static int descriptor_count
;
57 #define bib_crc(v) ((v) << 0)
58 #define bib_crc_length(v) ((v) << 16)
59 #define bib_info_length(v) ((v) << 24)
61 #define bib_link_speed(v) ((v) << 0)
62 #define bib_generation(v) ((v) << 4)
63 #define bib_max_rom(v) ((v) << 8)
64 #define bib_max_receive(v) ((v) << 12)
65 #define bib_cyc_clk_acc(v) ((v) << 16)
66 #define bib_pmc ((1) << 27)
67 #define bib_bmc ((1) << 28)
68 #define bib_isc ((1) << 29)
69 #define bib_cmc ((1) << 30)
70 #define bib_imc ((1) << 31)
73 generate_config_rom (struct fw_card
*card
, size_t *config_rom_length
)
75 struct fw_descriptor
*desc
;
76 static u32 config_rom
[256];
79 /* Initialize contents of config rom buffer. On the OHCI
80 * controller, block reads to the config rom accesses the host
81 * memory, but quadlet read access the hardware bus info block
82 * registers. That's just crack, but it means we should make
83 * sure the contents of bus info block in host memory mathces
84 * the version stored in the OHCI registers. */
86 memset(config_rom
, 0, sizeof config_rom
);
87 config_rom
[0] = bib_crc_length(4) | bib_info_length(4) | bib_crc(0);
88 config_rom
[1] = 0x31333934;
91 bib_link_speed(card
->link_speed
) |
92 bib_generation(card
->config_rom_generation
++ % 14 + 2) |
94 bib_max_receive(card
->max_receive
) |
95 bib_bmc
| bib_isc
| bib_cmc
| bib_imc
;
96 config_rom
[3] = card
->guid
>> 32;
97 config_rom
[4] = card
->guid
;
99 /* Generate root directory. */
102 config_rom
[i
++] = 0x0c0083c0; /* node capabilities */
103 j
= i
+ descriptor_count
;
105 /* Generate root directory entries for descriptors. */
106 list_for_each_entry (desc
, &descriptor_list
, link
) {
107 if (desc
->immediate
> 0)
108 config_rom
[i
++] = desc
->immediate
;
109 config_rom
[i
] = desc
->key
| (j
- i
);
114 /* Update root directory length. */
115 config_rom
[5] = (i
- 5 - 1) << 16;
117 /* End of root directory, now copy in descriptors. */
118 list_for_each_entry (desc
, &descriptor_list
, link
) {
119 memcpy(&config_rom
[i
], desc
->data
, desc
->length
* 4);
123 /* Calculate CRCs for all blocks in the config rom. This
124 * assumes that CRC length and info length are identical for
125 * the bus info block, which is always the case for this
127 for (i
= 0; i
< j
; i
+= length
+ 1) {
128 length
= (config_rom
[i
] >> 16) & 0xff;
129 config_rom
[i
] |= crc16_itu_t(&config_rom
[i
+ 1], length
);
132 *config_rom_length
= j
;
138 update_config_roms (void)
140 struct fw_card
*card
;
144 list_for_each_entry (card
, &card_list
, link
) {
145 config_rom
= generate_config_rom(card
, &length
);
146 card
->driver
->set_config_rom(card
, config_rom
, length
);
151 fw_core_add_descriptor (struct fw_descriptor
*desc
)
155 /* Check descriptor is valid; the length of all blocks in the
156 * descriptor has to add up to exactly the length of the
159 while (i
< desc
->length
)
160 i
+= (desc
->data
[i
] >> 16) + 1;
162 if (i
!= desc
->length
)
165 down_write(&fw_bus_type
.subsys
.rwsem
);
167 list_add_tail (&desc
->link
, &descriptor_list
);
169 if (desc
->immediate
> 0)
171 update_config_roms();
173 up_write(&fw_bus_type
.subsys
.rwsem
);
177 EXPORT_SYMBOL(fw_core_add_descriptor
);
180 fw_core_remove_descriptor (struct fw_descriptor
*desc
)
182 down_write(&fw_bus_type
.subsys
.rwsem
);
184 list_del(&desc
->link
);
186 if (desc
->immediate
> 0)
188 update_config_roms();
190 up_write(&fw_bus_type
.subsys
.rwsem
);
192 EXPORT_SYMBOL(fw_core_remove_descriptor
);
194 static const char gap_count_table
[] = {
195 63, 5, 7, 8, 10, 13, 16, 18, 21, 24, 26, 29, 32, 35, 37, 40
199 struct fw_transaction t
;
206 struct completion done
;
210 complete_bm_lock(struct fw_card
*card
, int rcode
,
211 void *payload
, size_t length
, void *data
)
213 struct bm_data
*bmd
= data
;
215 if (rcode
== RCODE_COMPLETE
)
216 bmd
->old
= be32_to_cpu(*(__be32
*) payload
);
218 complete(&bmd
->done
);
222 fw_card_bm_work(struct work_struct
*work
)
224 struct fw_card
*card
= container_of(work
, struct fw_card
, work
.work
);
225 struct fw_device
*root
;
228 int root_id
, new_root_id
, irm_id
, gap_count
, generation
, grace
;
231 spin_lock_irqsave(&card
->lock
, flags
);
233 generation
= card
->generation
;
234 root
= card
->root_node
->data
;
235 root_id
= card
->root_node
->node_id
;
236 grace
= time_after(jiffies
, card
->reset_jiffies
+ DIV_ROUND_UP(HZ
, 10));
238 if (card
->bm_generation
+ 1 == generation
||
239 (card
->bm_generation
!= generation
&& grace
)) {
240 /* This first step is to figure out who is IRM and
241 * then try to become bus manager. If the IRM is not
242 * well defined (e.g. does not have an active link
243 * layer or does not responds to our lock request, we
244 * will have to do a little vigilante bus management.
245 * In that case, we do a goto into the gap count logic
246 * so that when we do the reset, we still optimize the
247 * gap count. That could well save a reset in the
248 * next generation. */
250 irm_id
= card
->irm_node
->node_id
;
251 if (!card
->irm_node
->link_on
) {
252 new_root_id
= card
->local_node
->node_id
;
253 fw_notify("IRM has link off, making local node (%02x) root.\n",
258 bmd
.lock
.arg
= cpu_to_be32(0x3f);
259 bmd
.lock
.data
= cpu_to_be32(card
->local_node
->node_id
);
261 spin_unlock_irqrestore(&card
->lock
, flags
);
263 init_completion(&bmd
.done
);
264 fw_send_request(card
, &bmd
.t
, TCODE_LOCK_COMPARE_SWAP
,
266 SCODE_100
, CSR_REGISTER_BASE
+ CSR_BUS_MANAGER_ID
,
267 &bmd
.lock
, sizeof bmd
.lock
,
268 complete_bm_lock
, &bmd
);
269 wait_for_completion(&bmd
.done
);
271 if (bmd
.rcode
== RCODE_GENERATION
) {
272 /* Another bus reset happened. Just return,
273 * the BM work has been rescheduled. */
277 if (bmd
.rcode
== RCODE_COMPLETE
&& bmd
.old
!= 0x3f)
278 /* Somebody else is BM, let them do the work. */
281 spin_lock_irqsave(&card
->lock
, flags
);
282 if (bmd
.rcode
!= RCODE_COMPLETE
) {
283 /* The lock request failed, maybe the IRM
284 * isn't really IRM capable after all. Let's
285 * do a bus reset and pick the local node as
286 * root, and thus, IRM. */
287 new_root_id
= card
->local_node
->node_id
;
288 fw_notify("BM lock failed, making local node (%02x) root.\n",
292 } else if (card
->bm_generation
!= generation
) {
293 /* OK, we weren't BM in the last generation, and it's
294 * less than 100ms since last bus reset. Reschedule
295 * this task 100ms from now. */
296 spin_unlock_irqrestore(&card
->lock
, flags
);
297 schedule_delayed_work(&card
->work
, DIV_ROUND_UP(HZ
, 10));
301 /* We're bus manager for this generation, so next step is to
302 * make sure we have an active cycle master and do gap count
304 card
->bm_generation
= generation
;
307 /* Either link_on is false, or we failed to read the
308 * config rom. In either case, pick another root. */
309 new_root_id
= card
->local_node
->node_id
;
310 } else if (atomic_read(&root
->state
) != FW_DEVICE_RUNNING
) {
311 /* If we haven't probed this device yet, bail out now
312 * and let's try again once that's done. */
313 spin_unlock_irqrestore(&card
->lock
, flags
);
315 } else if (root
->config_rom
[2] & bib_cmc
) {
316 /* FIXME: I suppose we should set the cmstr bit in the
317 * STATE_CLEAR register of this node, as described in
318 * 1394-1995, 8.4.2.6. Also, send out a force root
319 * packet for this node. */
320 new_root_id
= root_id
;
322 /* Current root has an active link layer and we
323 * successfully read the config rom, but it's not
324 * cycle master capable. */
325 new_root_id
= card
->local_node
->node_id
;
329 /* Now figure out what gap count to set. */
330 if (card
->topology_type
== FW_TOPOLOGY_A
&&
331 card
->root_node
->max_hops
< ARRAY_SIZE(gap_count_table
))
332 gap_count
= gap_count_table
[card
->root_node
->max_hops
];
336 /* Finally, figure out if we should do a reset or not. If we've
337 * done less that 5 resets with the same physical topology and we
338 * have either a new root or a new gap count setting, let's do it. */
340 if (card
->bm_retries
++ < 5 &&
341 (card
->gap_count
!= gap_count
|| new_root_id
!= root_id
))
344 spin_unlock_irqrestore(&card
->lock
, flags
);
347 fw_notify("phy config: card %d, new root=%x, gap_count=%d\n",
348 card
->index
, new_root_id
, gap_count
);
349 fw_send_phy_config(card
, new_root_id
, generation
, gap_count
);
350 fw_core_initiate_bus_reset(card
, 1);
355 flush_timer_callback(unsigned long data
)
357 struct fw_card
*card
= (struct fw_card
*)data
;
359 fw_flush_transactions(card
);
363 fw_card_initialize(struct fw_card
*card
, const struct fw_card_driver
*driver
,
364 struct device
*device
)
366 static atomic_t index
= ATOMIC_INIT(-1);
368 kref_init(&card
->kref
);
369 card
->index
= atomic_inc_return(&index
);
370 card
->driver
= driver
;
371 card
->device
= device
;
372 card
->current_tlabel
= 0;
373 card
->tlabel_mask
= 0;
376 INIT_LIST_HEAD(&card
->transaction_list
);
377 spin_lock_init(&card
->lock
);
378 setup_timer(&card
->flush_timer
,
379 flush_timer_callback
, (unsigned long)card
);
381 card
->local_node
= NULL
;
383 INIT_DELAYED_WORK(&card
->work
, fw_card_bm_work
);
385 EXPORT_SYMBOL(fw_card_initialize
);
388 fw_card_add(struct fw_card
*card
,
389 u32 max_receive
, u32 link_speed
, u64 guid
)
394 card
->max_receive
= max_receive
;
395 card
->link_speed
= link_speed
;
398 /* FIXME: add #define's for phy registers. */
399 /* Activate link_on bit and contender bit in our self ID packets.*/
400 if (card
->driver
->update_phy_reg(card
, 4, 0, 0x80 | 0x40) < 0)
403 /* The subsystem grabs a reference when the card is added and
404 * drops it when the driver calls fw_core_remove_card. */
407 down_write(&fw_bus_type
.subsys
.rwsem
);
408 config_rom
= generate_config_rom (card
, &length
);
409 list_add_tail(&card
->link
, &card_list
);
410 up_write(&fw_bus_type
.subsys
.rwsem
);
412 return card
->driver
->enable(card
, config_rom
, length
);
414 EXPORT_SYMBOL(fw_card_add
);
417 /* The next few functions implements a dummy driver that use once a
418 * card driver shuts down an fw_card. This allows the driver to
419 * cleanly unload, as all IO to the card will be handled by the dummy
420 * driver instead of calling into the (possibly) unloaded module. The
421 * dummy driver just fails all IO. */
424 dummy_enable(struct fw_card
*card
, u32
*config_rom
, size_t length
)
431 dummy_update_phy_reg(struct fw_card
*card
, int address
,
432 int clear_bits
, int set_bits
)
438 dummy_set_config_rom(struct fw_card
*card
,
439 u32
*config_rom
, size_t length
)
441 /* We take the card out of card_list before setting the dummy
442 * driver, so this should never get called. */
448 dummy_send_request(struct fw_card
*card
, struct fw_packet
*packet
)
450 packet
->callback(packet
, card
, -ENODEV
);
454 dummy_send_response(struct fw_card
*card
, struct fw_packet
*packet
)
456 packet
->callback(packet
, card
, -ENODEV
);
460 dummy_cancel_packet(struct fw_card
*card
, struct fw_packet
*packet
)
466 dummy_enable_phys_dma(struct fw_card
*card
,
467 int node_id
, int generation
)
472 static struct fw_card_driver dummy_driver
= {
474 .enable
= dummy_enable
,
475 .update_phy_reg
= dummy_update_phy_reg
,
476 .set_config_rom
= dummy_set_config_rom
,
477 .send_request
= dummy_send_request
,
478 .cancel_packet
= dummy_cancel_packet
,
479 .send_response
= dummy_send_response
,
480 .enable_phys_dma
= dummy_enable_phys_dma
,
484 fw_core_remove_card(struct fw_card
*card
)
486 card
->driver
->update_phy_reg(card
, 4, 0x80 | 0x40, 0);
487 fw_core_initiate_bus_reset(card
, 1);
489 down_write(&fw_bus_type
.subsys
.rwsem
);
490 list_del(&card
->link
);
491 up_write(&fw_bus_type
.subsys
.rwsem
);
493 /* Set up the dummy driver. */
494 card
->driver
= &dummy_driver
;
496 fw_flush_transactions(card
);
498 fw_destroy_nodes(card
);
502 EXPORT_SYMBOL(fw_core_remove_card
);
505 fw_card_get(struct fw_card
*card
)
507 kref_get(&card
->kref
);
511 EXPORT_SYMBOL(fw_card_get
);
514 release_card(struct kref
*kref
)
516 struct fw_card
*card
= container_of(kref
, struct fw_card
, kref
);
521 /* An assumption for fw_card_put() is that the card driver allocates
522 * the fw_card struct with kalloc and that it has been shut down
523 * before the last ref is dropped. */
525 fw_card_put(struct fw_card
*card
)
527 kref_put(&card
->kref
, release_card
);
529 EXPORT_SYMBOL(fw_card_put
);
532 fw_core_initiate_bus_reset(struct fw_card
*card
, int short_reset
)
534 return card
->driver
->update_phy_reg(card
, short_reset
? 5 : 1, 0, 0x40);
536 EXPORT_SYMBOL(fw_core_initiate_bus_reset
);