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USB: fix the USB_GADGET_DUMMY_HCD dependencies
[linux-2.6/linux-mips.git] / drivers / ieee1394 / dv1394.c
blob87532dd43374f9625d9f06693503a63c07a2758f
1 /*
2 * dv1394.c - DV input/output over IEEE 1394 on OHCI chips
3 * Copyright (C)2001 Daniel Maas <dmaas@dcine.com>
4 * receive by Dan Dennedy <dan@dennedy.org>
5 *
6 * based on:
7 * video1394.c - video driver for OHCI 1394 boards
8 * Copyright (C)1999,2000 Sebastien Rougeaux <sebastien.rougeaux@anu.edu.au>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software Foundation,
22 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 */
24
25 /*
26 OVERVIEW
27
28 I designed dv1394 as a "pipe" that you can use to shoot DV onto a
29 FireWire bus. In transmission mode, dv1394 does the following:
30
31 1. accepts contiguous frames of DV data from user-space, via write()
32 or mmap() (see dv1394.h for the complete API)
33 2. wraps IEC 61883 packets around the DV data, inserting
34 empty synchronization packets as necessary
35 3. assigns accurate SYT timestamps to the outgoing packets
36 4. shoots them out using the OHCI card's IT DMA engine
37
38 Thanks to Dan Dennedy, we now have a receive mode that does the following:
39
40 1. accepts raw IEC 61883 packets from the OHCI card
41 2. re-assembles the DV data payloads into contiguous frames,
42 discarding empty packets
43 3. sends the DV data to user-space via read() or mmap()
44 */
45
46 /*
47 TODO:
48
49 - tunable frame-drop behavior: either loop last frame, or halt transmission
50
51 - use a scatter/gather buffer for DMA programs (f->descriptor_pool)
52 so that we don't rely on allocating 64KB of contiguous kernel memory
53 via pci_alloc_consistent()
54
55 DONE:
56 - during reception, better handling of dropped frames and continuity errors
57 - during reception, prevent DMA from bypassing the irq tasklets
58 - reduce irq rate during reception (1/250 packets).
59 - add many more internal buffers during reception with scatter/gather dma.
60 - add dbc (continuity) checking on receive, increment status.dropped_frames
61 if not continuous.
62 - restart IT DMA after a bus reset
63 - safely obtain and release ISO Tx channels in cooperation with OHCI driver
64 - map received DIF blocks to their proper location in DV frame (ensure
65 recovery if dropped packet)
66 - handle bus resets gracefully (OHCI card seems to take care of this itself(!))
67 - do not allow resizing the user_buf once allocated; eliminate nuke_buffer_mappings
68 - eliminated #ifdef DV1394_DEBUG_LEVEL by inventing macros debug_printk and irq_printk
69 - added wmb() and mb() to places where PCI read/write ordering needs to be enforced
70 - set video->id correctly
71 - store video_cards in an array indexed by OHCI card ID, rather than a list
72 - implement DMA context allocation to cooperate with other users of the OHCI
73 - fix all XXX showstoppers
74 - disable IR/IT DMA interrupts on shutdown
75 - flush pci writes to the card by issuing a read
76 - character device dispatching
77 - switch over to the new kernel DMA API (pci_map_*()) (* needs testing on platforms with IOMMU!)
78 - keep all video_cards in a list (for open() via chardev), set file->private_data = video
79 - dv1394_poll should indicate POLLIN when receiving buffers are available
80 - add proc fs interface to set cip_n, cip_d, syt_offset, and video signal
81 - expose xmit and recv as separate devices (not exclusive)
82 - expose NTSC and PAL as separate devices (can be overridden)
83
84 */
85
86 #include <linux/kernel.h>
87 #include <linux/list.h>
88 #include <linux/slab.h>
89 #include <linux/interrupt.h>
90 #include <linux/wait.h>
91 #include <linux/errno.h>
92 #include <linux/module.h>
93 #include <linux/init.h>
94 #include <linux/pci.h>
95 #include <linux/fs.h>
96 #include <linux/poll.h>
97 #include <linux/smp_lock.h>
98 #include <linux/bitops.h>
99 #include <asm/byteorder.h>
100 #include <asm/atomic.h>
101 #include <asm/io.h>
102 #include <asm/uaccess.h>
103 #include <linux/delay.h>
104 #include <asm/pgtable.h>
105 #include <asm/page.h>
106 #include <linux/sched.h>
107 #include <linux/types.h>
108 #include <linux/vmalloc.h>
109 #include <linux/string.h>
110 #include <linux/compat.h>
111 #include <linux/cdev.h>
112
113 #include "ieee1394.h"
114 #include "ieee1394_types.h"
115 #include "nodemgr.h"
116 #include "hosts.h"
117 #include "ieee1394_core.h"
118 #include "highlevel.h"
119 #include "dv1394.h"
120 #include "dv1394-private.h"
121
122 #include "ohci1394.h"
123
124 /* DEBUG LEVELS:
125 0 - no debugging messages
126 1 - some debugging messages, but none during DMA frame transmission
127 2 - lots of messages, including during DMA frame transmission
128 (will cause undeflows if your machine is too slow!)
129 */
130
131 #define DV1394_DEBUG_LEVEL 0
132
133 /* for debugging use ONLY: allow more than one open() of the device */
134 /* #define DV1394_ALLOW_MORE_THAN_ONE_OPEN 1 */
135
136 #if DV1394_DEBUG_LEVEL >= 2
137 #define irq_printk( args... ) printk( args )
138 #else
139 #define irq_printk( args... )
140 #endif
141
142 #if DV1394_DEBUG_LEVEL >= 1
143 #define debug_printk( args... ) printk( args)
144 #else
145 #define debug_printk( args... )
146 #endif
147
148 /* issue a dummy PCI read to force the preceding write
149 to be posted to the PCI bus immediately */
150
151 static inline void flush_pci_write(struct ti_ohci *ohci)
152 {
153 mb();
154 reg_read(ohci, OHCI1394_IsochronousCycleTimer);
155 }
156
157 static void it_tasklet_func(unsigned long data);
158 static void ir_tasklet_func(unsigned long data);
159
160 #ifdef CONFIG_COMPAT
161 static long dv1394_compat_ioctl(struct file *file, unsigned int cmd,
162 unsigned long arg);
163 #endif
164
165 /* GLOBAL DATA */
166
167 /* list of all video_cards */
168 static LIST_HEAD(dv1394_cards);
169 static DEFINE_SPINLOCK(dv1394_cards_lock);
170
171 /* translate from a struct file* to the corresponding struct video_card* */
172
173 static inline struct video_card* file_to_video_card(struct file *file)
174 {
175 return (struct video_card*) file->private_data;
176 }
177
178 /*** FRAME METHODS *********************************************************/
179
180 static void frame_reset(struct frame *f)
181 {
182 f->state = FRAME_CLEAR;
183 f->done = 0;
184 f->n_packets = 0;
185 f->frame_begin_timestamp = NULL;
186 f->assigned_timestamp = 0;
187 f->cip_syt1 = NULL;
188 f->cip_syt2 = NULL;
189 f->mid_frame_timestamp = NULL;
190 f->frame_end_timestamp = NULL;
191 f->frame_end_branch = NULL;
192 }
193
194 static struct frame* frame_new(unsigned int frame_num, struct video_card *video)
195 {
196 struct frame *f = kmalloc(sizeof(*f), GFP_KERNEL);
197 if (!f)
198 return NULL;
199
200 f->video = video;
201 f->frame_num = frame_num;
202
203 f->header_pool = pci_alloc_consistent(f->video->ohci->dev, PAGE_SIZE, &f->header_pool_dma);
204 if (!f->header_pool) {
205 printk(KERN_ERR "dv1394: failed to allocate CIP header pool\n");
206 kfree(f);
207 return NULL;
208 }
209
210 debug_printk("dv1394: frame_new: allocated CIP header pool at virt 0x%08lx (contig) dma 0x%08lx size %ld\n",
211 (unsigned long) f->header_pool, (unsigned long) f->header_pool_dma, PAGE_SIZE);
212
213 f->descriptor_pool_size = MAX_PACKETS * sizeof(struct DMA_descriptor_block);
214 /* make it an even # of pages */
215 f->descriptor_pool_size += PAGE_SIZE - (f->descriptor_pool_size%PAGE_SIZE);
216
217 f->descriptor_pool = pci_alloc_consistent(f->video->ohci->dev,
218 f->descriptor_pool_size,
219 &f->descriptor_pool_dma);
220 if (!f->descriptor_pool) {
221 pci_free_consistent(f->video->ohci->dev, PAGE_SIZE, f->header_pool, f->header_pool_dma);
222 kfree(f);
223 return NULL;
224 }
225
226 debug_printk("dv1394: frame_new: allocated DMA program memory at virt 0x%08lx (contig) dma 0x%08lx size %ld\n",
227 (unsigned long) f->descriptor_pool, (unsigned long) f->descriptor_pool_dma, f->descriptor_pool_size);
228
229 f->data = 0;
230 frame_reset(f);
231
232 return f;
233 }
234
235 static void frame_delete(struct frame *f)
236 {
237 pci_free_consistent(f->video->ohci->dev, PAGE_SIZE, f->header_pool, f->header_pool_dma);
238 pci_free_consistent(f->video->ohci->dev, f->descriptor_pool_size, f->descriptor_pool, f->descriptor_pool_dma);
239 kfree(f);
240 }
241
242
243
244
245 /*
246 frame_prepare() - build the DMA program for transmitting
247
248 Frame_prepare() must be called OUTSIDE the video->spinlock.
249 However, frame_prepare() must still be serialized, so
250 it should be called WITH the video->sem taken.
251 */
252
253 static void frame_prepare(struct video_card *video, unsigned int this_frame)
254 {
255 struct frame *f = video->frames[this_frame];
256 int last_frame;
257
258 struct DMA_descriptor_block *block;
259 dma_addr_t block_dma;
260 struct CIP_header *cip;
261 dma_addr_t cip_dma;
262
263 unsigned int n_descriptors, full_packets, packets_per_frame, payload_size;
264
265 /* these flags denote packets that need special attention */
266 int empty_packet, first_packet, last_packet, mid_packet;
267
268 u32 *branch_address, *last_branch_address = NULL;
269 unsigned long data_p;
270 int first_packet_empty = 0;
271 u32 cycleTimer, ct_sec, ct_cyc, ct_off;
272 unsigned long irq_flags;
273
274 irq_printk("frame_prepare( %d ) ---------------------\n", this_frame);
275
276 full_packets = 0;
277
278
279
280 if (video->pal_or_ntsc == DV1394_PAL)
281 packets_per_frame = DV1394_PAL_PACKETS_PER_FRAME;
282 else
283 packets_per_frame = DV1394_NTSC_PACKETS_PER_FRAME;
284
285 while ( full_packets < packets_per_frame ) {
286 empty_packet = first_packet = last_packet = mid_packet = 0;
287
288 data_p = f->data + full_packets * 480;
289
290 /************************************************/
291 /* allocate a descriptor block and a CIP header */
292 /************************************************/
293
294 /* note: these should NOT cross a page boundary (DMA restriction) */
295
296 if (f->n_packets >= MAX_PACKETS) {
297 printk(KERN_ERR "dv1394: FATAL ERROR: max packet count exceeded\n");
298 return;
299 }
300
301 /* the block surely won't cross a page boundary,
302 since an even number of descriptor_blocks fit on a page */
303 block = &(f->descriptor_pool[f->n_packets]);
304
305 /* DMA address of the block = offset of block relative
306 to the kernel base address of the descriptor pool
307 + DMA base address of the descriptor pool */
308 block_dma = ((unsigned long) block - (unsigned long) f->descriptor_pool) + f->descriptor_pool_dma;
309
310
311 /* the whole CIP pool fits on one page, so no worries about boundaries */
312 if ( ((unsigned long) &(f->header_pool[f->n_packets]) - (unsigned long) f->header_pool)
313 > PAGE_SIZE) {
314 printk(KERN_ERR "dv1394: FATAL ERROR: no room to allocate CIP header\n");
315 return;
316 }
317
318 cip = &(f->header_pool[f->n_packets]);
319
320 /* DMA address of the CIP header = offset of cip
321 relative to kernel base address of the header pool
322 + DMA base address of the header pool */
323 cip_dma = (unsigned long) cip % PAGE_SIZE + f->header_pool_dma;
324
325 /* is this an empty packet? */
326
327 if (video->cip_accum > (video->cip_d - video->cip_n)) {
328 empty_packet = 1;
329 payload_size = 8;
330 video->cip_accum -= (video->cip_d - video->cip_n);
331 } else {
332 payload_size = 488;
333 video->cip_accum += video->cip_n;
334 }
335
336 /* there are three important packets each frame:
337
338 the first packet in the frame - we ask the card to record the timestamp when
339 this packet is actually sent, so we can monitor
340 how accurate our timestamps are. Also, the first
341 packet serves as a semaphore to let us know that
342 it's OK to free the *previous* frame's DMA buffer
343
344 the last packet in the frame - this packet is used to detect buffer underflows.
345 if this is the last ready frame, the last DMA block
346 will have a branch back to the beginning of the frame
347 (so that the card will re-send the frame on underflow).
348 if this branch gets taken, we know that at least one
349 frame has been dropped. When the next frame is ready,
350 the branch is pointed to its first packet, and the
351 semaphore is disabled.
352
353 a "mid" packet slightly before the end of the frame - this packet should trigger
354 an interrupt so we can go and assign a timestamp to the first packet
355 in the next frame. We don't use the very last packet in the frame
356 for this purpose, because that would leave very little time to set
357 the timestamp before DMA starts on the next frame.
358 */
359
360 if (f->n_packets == 0) {
361 first_packet = 1;
362 } else if ( full_packets == (packets_per_frame-1) ) {
363 last_packet = 1;
364 } else if (f->n_packets == packets_per_frame) {
365 mid_packet = 1;
366 }
367
368
369 /********************/
370 /* setup CIP header */
371 /********************/
372
373 /* the timestamp will be written later from the
374 mid-frame interrupt handler. For now we just
375 store the address of the CIP header(s) that
376 need a timestamp. */
377
378 /* first packet in the frame needs a timestamp */
379 if (first_packet) {
380 f->cip_syt1 = cip;
381 if (empty_packet)
382 first_packet_empty = 1;
383
384 } else if (first_packet_empty && (f->n_packets == 1) ) {
385 /* if the first packet was empty, the second
386 packet's CIP header also needs a timestamp */
387 f->cip_syt2 = cip;
388 }
389
390 fill_cip_header(cip,
391 /* the node ID number of the OHCI card */
392 reg_read(video->ohci, OHCI1394_NodeID) & 0x3F,
393 video->continuity_counter,
394 video->pal_or_ntsc,
395 0xFFFF /* the timestamp is filled in later */);
396
397 /* advance counter, only for full packets */
398 if ( ! empty_packet )
399 video->continuity_counter++;
400
401 /******************************/
402 /* setup DMA descriptor block */
403 /******************************/
404
405 /* first descriptor - OUTPUT_MORE_IMMEDIATE, for the controller's IT header */
406 fill_output_more_immediate( &(block->u.out.omi), 1, video->channel, 0, payload_size);
407
408 if (empty_packet) {
409 /* second descriptor - OUTPUT_LAST for CIP header */
410 fill_output_last( &(block->u.out.u.empty.ol),
411
412 /* want completion status on all interesting packets */
413 (first_packet || mid_packet || last_packet) ? 1 : 0,
414
415 /* want interrupts on all interesting packets */
416 (first_packet || mid_packet || last_packet) ? 1 : 0,
417
418 sizeof(struct CIP_header), /* data size */
419 cip_dma);
420
421 if (first_packet)
422 f->frame_begin_timestamp = &(block->u.out.u.empty.ol.q[3]);
423 else if (mid_packet)
424 f->mid_frame_timestamp = &(block->u.out.u.empty.ol.q[3]);
425 else if (last_packet) {
426 f->frame_end_timestamp = &(block->u.out.u.empty.ol.q[3]);
427 f->frame_end_branch = &(block->u.out.u.empty.ol.q[2]);
428 }
429
430 branch_address = &(block->u.out.u.empty.ol.q[2]);
431 n_descriptors = 3;
432 if (first_packet)
433 f->first_n_descriptors = n_descriptors;
434
435 } else { /* full packet */
436
437 /* second descriptor - OUTPUT_MORE for CIP header */
438 fill_output_more( &(block->u.out.u.full.om),
439 sizeof(struct CIP_header), /* data size */
440 cip_dma);
441
442
443 /* third (and possibly fourth) descriptor - for DV data */
444 /* the 480-byte payload can cross a page boundary; if so,
445 we need to split it into two DMA descriptors */
446
447 /* does the 480-byte data payload cross a page boundary? */
448 if ( (PAGE_SIZE- ((unsigned long)data_p % PAGE_SIZE) ) < 480 ) {
449
450 /* page boundary crossed */
451
452 fill_output_more( &(block->u.out.u.full.u.cross.om),
453 /* data size - how much of data_p fits on the first page */
454 PAGE_SIZE - (data_p % PAGE_SIZE),
455
456 /* DMA address of data_p */
457 dma_region_offset_to_bus(&video->dv_buf,
458 data_p - (unsigned long) video->dv_buf.kvirt));
459
460 fill_output_last( &(block->u.out.u.full.u.cross.ol),
461
462 /* want completion status on all interesting packets */
463 (first_packet || mid_packet || last_packet) ? 1 : 0,
464
465 /* want interrupt on all interesting packets */
466 (first_packet || mid_packet || last_packet) ? 1 : 0,
467
468 /* data size - remaining portion of data_p */
469 480 - (PAGE_SIZE - (data_p % PAGE_SIZE)),
470
471 /* DMA address of data_p + PAGE_SIZE - (data_p % PAGE_SIZE) */
472 dma_region_offset_to_bus(&video->dv_buf,
473 data_p + PAGE_SIZE - (data_p % PAGE_SIZE) - (unsigned long) video->dv_buf.kvirt));
474
475 if (first_packet)
476 f->frame_begin_timestamp = &(block->u.out.u.full.u.cross.ol.q[3]);
477 else if (mid_packet)
478 f->mid_frame_timestamp = &(block->u.out.u.full.u.cross.ol.q[3]);
479 else if (last_packet) {
480 f->frame_end_timestamp = &(block->u.out.u.full.u.cross.ol.q[3]);
481 f->frame_end_branch = &(block->u.out.u.full.u.cross.ol.q[2]);
482 }
483
484 branch_address = &(block->u.out.u.full.u.cross.ol.q[2]);
485
486 n_descriptors = 5;
487 if (first_packet)
488 f->first_n_descriptors = n_descriptors;
489
490 full_packets++;
491
492 } else {
493 /* fits on one page */
494
495 fill_output_last( &(block->u.out.u.full.u.nocross.ol),
496
497 /* want completion status on all interesting packets */
498 (first_packet || mid_packet || last_packet) ? 1 : 0,
499
500 /* want interrupt on all interesting packets */
501 (first_packet || mid_packet || last_packet) ? 1 : 0,
502
503 480, /* data size (480 bytes of DV data) */
504
505
506 /* DMA address of data_p */
507 dma_region_offset_to_bus(&video->dv_buf,
508 data_p - (unsigned long) video->dv_buf.kvirt));
509
510 if (first_packet)
511 f->frame_begin_timestamp = &(block->u.out.u.full.u.nocross.ol.q[3]);
512 else if (mid_packet)
513 f->mid_frame_timestamp = &(block->u.out.u.full.u.nocross.ol.q[3]);
514 else if (last_packet) {
515 f->frame_end_timestamp = &(block->u.out.u.full.u.nocross.ol.q[3]);
516 f->frame_end_branch = &(block->u.out.u.full.u.nocross.ol.q[2]);
517 }
518
519 branch_address = &(block->u.out.u.full.u.nocross.ol.q[2]);
520
521 n_descriptors = 4;
522 if (first_packet)
523 f->first_n_descriptors = n_descriptors;
524
525 full_packets++;
526 }
527 }
528
529 /* link this descriptor block into the DMA program by filling in
530 the branch address of the previous block */
531
532 /* note: we are not linked into the active DMA chain yet */
533
534 if (last_branch_address) {
535 *(last_branch_address) = cpu_to_le32(block_dma | n_descriptors);
536 }
537
538 last_branch_address = branch_address;
539
540
541 f->n_packets++;
542
543 }
544
545 /* when we first assemble a new frame, set the final branch
546 to loop back up to the top */
547 *(f->frame_end_branch) = cpu_to_le32(f->descriptor_pool_dma | f->first_n_descriptors);
548
549 /* make the latest version of this frame visible to the PCI card */
550 dma_region_sync_for_device(&video->dv_buf, f->data - (unsigned long) video->dv_buf.kvirt, video->frame_size);
551
552 /* lock against DMA interrupt */
553 spin_lock_irqsave(&video->spinlock, irq_flags);
554
555 f->state = FRAME_READY;
556
557 video->n_clear_frames--;
558
559 last_frame = video->first_clear_frame - 1;
560 if (last_frame == -1)
561 last_frame = video->n_frames-1;
562
563 video->first_clear_frame = (video->first_clear_frame + 1) % video->n_frames;
564
565 irq_printk(" frame %d prepared, active_frame = %d, n_clear_frames = %d, first_clear_frame = %d\n last=%d\n",
566 this_frame, video->active_frame, video->n_clear_frames, video->first_clear_frame, last_frame);
567
568 irq_printk(" begin_ts %08lx mid_ts %08lx end_ts %08lx end_br %08lx\n",
569 (unsigned long) f->frame_begin_timestamp,
570 (unsigned long) f->mid_frame_timestamp,
571 (unsigned long) f->frame_end_timestamp,
572 (unsigned long) f->frame_end_branch);
573
574 if (video->active_frame != -1) {
575
576 /* if DMA is already active, we are almost done */
577 /* just link us onto the active DMA chain */
578 if (video->frames[last_frame]->frame_end_branch) {
579 u32 temp;
580
581 /* point the previous frame's tail to this frame's head */
582 *(video->frames[last_frame]->frame_end_branch) = cpu_to_le32(f->descriptor_pool_dma | f->first_n_descriptors);
583
584 /* this write MUST precede the next one, or we could silently drop frames */
585 wmb();
586
587 /* disable the want_status semaphore on the last packet */
588 temp = le32_to_cpu(*(video->frames[last_frame]->frame_end_branch - 2));
589 temp &= 0xF7CFFFFF;
590 *(video->frames[last_frame]->frame_end_branch - 2) = cpu_to_le32(temp);
591
592 /* flush these writes to memory ASAP */
593 flush_pci_write(video->ohci);
594
595 /* NOTE:
596 ideally the writes should be "atomic": if
597 the OHCI card reads the want_status flag in
598 between them, we'll falsely report a
599 dropped frame. Hopefully this window is too
600 small to really matter, and the consequence
601 is rather harmless. */
602
603
604 irq_printk(" new frame %d linked onto DMA chain\n", this_frame);
605
606 } else {
607 printk(KERN_ERR "dv1394: last frame not ready???\n");
608 }
609
610 } else {
611
612 u32 transmit_sec, transmit_cyc;
613 u32 ts_cyc, ts_off;
614
615 /* DMA is stopped, so this is the very first frame */
616 video->active_frame = this_frame;
617
618 /* set CommandPtr to address and size of first descriptor block */
619 reg_write(video->ohci, video->ohci_IsoXmitCommandPtr,
620 video->frames[video->active_frame]->descriptor_pool_dma |
621 f->first_n_descriptors);
622
623 /* assign a timestamp based on the current cycle time...
624 We'll tell the card to begin DMA 100 cycles from now,
625 and assign a timestamp 103 cycles from now */
626
627 cycleTimer = reg_read(video->ohci, OHCI1394_IsochronousCycleTimer);
628
629 ct_sec = cycleTimer >> 25;
630 ct_cyc = (cycleTimer >> 12) & 0x1FFF;
631 ct_off = cycleTimer & 0xFFF;
632
633 transmit_sec = ct_sec;
634 transmit_cyc = ct_cyc + 100;
635
636 transmit_sec += transmit_cyc/8000;
637 transmit_cyc %= 8000;
638
639 ts_off = ct_off;
640 ts_cyc = transmit_cyc + 3;
641 ts_cyc %= 8000;
642
643 f->assigned_timestamp = (ts_cyc&0xF) << 12;
644
645 /* now actually write the timestamp into the appropriate CIP headers */
646 if (f->cip_syt1) {
647 f->cip_syt1->b[6] = f->assigned_timestamp >> 8;
648 f->cip_syt1->b[7] = f->assigned_timestamp & 0xFF;
649 }
650 if (f->cip_syt2) {
651 f->cip_syt2->b[6] = f->assigned_timestamp >> 8;
652 f->cip_syt2->b[7] = f->assigned_timestamp & 0xFF;
653 }
654
655 /* --- start DMA --- */
656
657 /* clear all bits in ContextControl register */
658
659 reg_write(video->ohci, video->ohci_IsoXmitContextControlClear, 0xFFFFFFFF);
660 wmb();
661
662 /* the OHCI card has the ability to start ISO transmission on a
663 particular cycle (start-on-cycle). This way we can ensure that
664 the first DV frame will have an accurate timestamp.
665
666 However, start-on-cycle only appears to work if the OHCI card
667 is cycle master! Since the consequences of messing up the first
668 timestamp are minimal*, just disable start-on-cycle for now.
669
670 * my DV deck drops the first few frames before it "locks in;"
671 so the first frame having an incorrect timestamp is inconsequential.
672 */
673
674 #if 0
675 reg_write(video->ohci, video->ohci_IsoXmitContextControlSet,
676 (1 << 31) /* enable start-on-cycle */
677 | ( (transmit_sec & 0x3) << 29)
678 | (transmit_cyc << 16));
679 wmb();
680 #endif
681
682 video->dma_running = 1;
683
684 /* set the 'run' bit */
685 reg_write(video->ohci, video->ohci_IsoXmitContextControlSet, 0x8000);
686 flush_pci_write(video->ohci);
687
688 /* --- DMA should be running now --- */
689
690 debug_printk(" Cycle = %4u ContextControl = %08x CmdPtr = %08x\n",
691 (reg_read(video->ohci, OHCI1394_IsochronousCycleTimer) >> 12) & 0x1FFF,
692 reg_read(video->ohci, video->ohci_IsoXmitContextControlSet),
693 reg_read(video->ohci, video->ohci_IsoXmitCommandPtr));
694
695 debug_printk(" DMA start - current cycle %4u, transmit cycle %4u (%2u), assigning ts cycle %2u\n",
696 ct_cyc, transmit_cyc, transmit_cyc & 0xF, ts_cyc & 0xF);
697
698 #if DV1394_DEBUG_LEVEL >= 2
699 {
700 /* check if DMA is really running */
701 int i = 0;
702 while (i < 20) {
703 mb();
704 mdelay(1);
705 if (reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & (1 << 10)) {
706 printk("DMA ACTIVE after %d msec\n", i);
707 break;
708 }
709 i++;
710 }
711
712 printk("set = %08x, cmdPtr = %08x\n",
713 reg_read(video->ohci, video->ohci_IsoXmitContextControlSet),
714 reg_read(video->ohci, video->ohci_IsoXmitCommandPtr)
715 );
716
717 if ( ! (reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & (1 << 10)) ) {
718 printk("DMA did NOT go active after 20ms, event = %x\n",
719 reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & 0x1F);
720 } else
721 printk("DMA is RUNNING!\n");
722 }
723 #endif
724
725 }
726
727
728 spin_unlock_irqrestore(&video->spinlock, irq_flags);
729 }
730
731
732
733 /*** RECEIVE FUNCTIONS *****************************************************/
734
735 /*
736 frame method put_packet
737
738 map and copy the packet data to its location in the frame
739 based upon DIF section and sequence
740 */
741
742 static void inline
743 frame_put_packet (struct frame *f, struct packet *p)
744 {
745 int section_type = p->data[0] >> 5; /* section type is in bits 5 - 7 */
746 int dif_sequence = p->data[1] >> 4; /* dif sequence number is in bits 4 - 7 */
747 int dif_block = p->data[2];
748
749 /* sanity check */
750 if (dif_sequence > 11 || dif_block > 149) return;
751
752 switch (section_type) {
753 case 0: /* 1 Header block */
754 memcpy( (void *) f->data + dif_sequence * 150 * 80, p->data, 480);
755 break;
756
757 case 1: /* 2 Subcode blocks */
758 memcpy( (void *) f->data + dif_sequence * 150 * 80 + (1 + dif_block) * 80, p->data, 480);
759 break;
760
761 case 2: /* 3 VAUX blocks */
762 memcpy( (void *) f->data + dif_sequence * 150 * 80 + (3 + dif_block) * 80, p->data, 480);
763 break;
764
765 case 3: /* 9 Audio blocks interleaved with video */
766 memcpy( (void *) f->data + dif_sequence * 150 * 80 + (6 + dif_block * 16) * 80, p->data, 480);
767 break;
768
769 case 4: /* 135 Video blocks interleaved with audio */
770 memcpy( (void *) f->data + dif_sequence * 150 * 80 + (7 + (dif_block / 15) + dif_block) * 80, p->data, 480);
771 break;
772
773 default: /* we can not handle any other data */
774 break;
775 }
776 }
777
778
779 static void start_dma_receive(struct video_card *video)
780 {
781 if (video->first_run == 1) {
782 video->first_run = 0;
783
784 /* start DMA once all of the frames are READY */
785 video->n_clear_frames = 0;
786 video->first_clear_frame = -1;
787 video->current_packet = 0;
788 video->active_frame = 0;
789
790 /* reset iso recv control register */
791 reg_write(video->ohci, video->ohci_IsoRcvContextControlClear, 0xFFFFFFFF);
792 wmb();
793
794 /* clear bufferFill, set isochHeader and speed (0=100) */
795 reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, 0x40000000);
796
797 /* match on all tags, listen on channel */
798 reg_write(video->ohci, video->ohci_IsoRcvContextMatch, 0xf0000000 | video->channel);
799
800 /* address and first descriptor block + Z=1 */
801 reg_write(video->ohci, video->ohci_IsoRcvCommandPtr,
802 video->frames[0]->descriptor_pool_dma | 1); /* Z=1 */
803 wmb();
804
805 video->dma_running = 1;
806
807 /* run */
808 reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, 0x8000);
809 flush_pci_write(video->ohci);
810
811 debug_printk("dv1394: DMA started\n");
812
813 #if DV1394_DEBUG_LEVEL >= 2
814 {
815 int i;
816
817 for (i = 0; i < 1000; ++i) {
818 mdelay(1);
819 if (reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & (1 << 10)) {
820 printk("DMA ACTIVE after %d msec\n", i);
821 break;
822 }
823 }
824 if ( reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & (1 << 11) ) {
825 printk("DEAD, event = %x\n",
826 reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & 0x1F);
827 } else
828 printk("RUNNING!\n");
829 }
830 #endif
831 } else if ( reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & (1 << 11) ) {
832 debug_printk("DEAD, event = %x\n",
833 reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & 0x1F);
834
835 /* wake */
836 reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 12));
837 }
838 }
839
840
841 /*
842 receive_packets() - build the DMA program for receiving
843 */
844
845 static void receive_packets(struct video_card *video)
846 {
847 struct DMA_descriptor_block *block = NULL;
848 dma_addr_t block_dma = 0;
849 struct packet *data = NULL;
850 dma_addr_t data_dma = 0;
851 u32 *last_branch_address = NULL;
852 unsigned long irq_flags;
853 int want_interrupt = 0;
854 struct frame *f = NULL;
855 int i, j;
856
857 spin_lock_irqsave(&video->spinlock, irq_flags);
858
859 for (j = 0; j < video->n_frames; j++) {
860
861 /* connect frames */
862 if (j > 0 && f != NULL && f->frame_end_branch != NULL)
863 *(f->frame_end_branch) = cpu_to_le32(video->frames[j]->descriptor_pool_dma | 1); /* set Z=1 */
864
865 f = video->frames[j];
866
867 for (i = 0; i < MAX_PACKETS; i++) {
868 /* locate a descriptor block and packet from the buffer */
869 block = &(f->descriptor_pool[i]);
870 block_dma = ((unsigned long) block - (unsigned long) f->descriptor_pool) + f->descriptor_pool_dma;
871
872 data = ((struct packet*)video->packet_buf.kvirt) + f->frame_num * MAX_PACKETS + i;
873 data_dma = dma_region_offset_to_bus( &video->packet_buf,
874 ((unsigned long) data - (unsigned long) video->packet_buf.kvirt) );
875
876 /* setup DMA descriptor block */
877 want_interrupt = ((i % (MAX_PACKETS/2)) == 0 || i == (MAX_PACKETS-1));
878 fill_input_last( &(block->u.in.il), want_interrupt, 512, data_dma);
879
880 /* link descriptors */
881 last_branch_address = f->frame_end_branch;
882
883 if (last_branch_address != NULL)
884 *(last_branch_address) = cpu_to_le32(block_dma | 1); /* set Z=1 */
885
886 f->frame_end_branch = &(block->u.in.il.q[2]);
887 }
888
889 } /* next j */
890
891 spin_unlock_irqrestore(&video->spinlock, irq_flags);
892
893 }
894
895
896
897 /*** MANAGEMENT FUNCTIONS **************************************************/
898
899 static int do_dv1394_init(struct video_card *video, struct dv1394_init *init)
900 {
901 unsigned long flags, new_buf_size;
902 int i;
903 u64 chan_mask;
904 int retval = -EINVAL;
905
906 debug_printk("dv1394: initialising %d\n", video->id);
907 if (init->api_version != DV1394_API_VERSION)
908 return -EINVAL;
909
910 /* first sanitize all the parameters */
911 if ( (init->n_frames < 2) || (init->n_frames > DV1394_MAX_FRAMES) )
912 return -EINVAL;
913
914 if ( (init->format != DV1394_NTSC) && (init->format != DV1394_PAL) )
915 return -EINVAL;
916
917 if ( (init->syt_offset == 0) || (init->syt_offset > 50) )
918 /* default SYT offset is 3 cycles */
919 init->syt_offset = 3;
920
921 if ( (init->channel > 63) || (init->channel < 0) )
922 init->channel = 63;
923
924 chan_mask = (u64)1 << init->channel;
925
926 /* calculate what size DMA buffer is needed */
927 if (init->format == DV1394_NTSC)
928 new_buf_size = DV1394_NTSC_FRAME_SIZE * init->n_frames;
929 else
930 new_buf_size = DV1394_PAL_FRAME_SIZE * init->n_frames;
931
932 /* round up to PAGE_SIZE */
933 if (new_buf_size % PAGE_SIZE) new_buf_size += PAGE_SIZE - (new_buf_size % PAGE_SIZE);
934
935 /* don't allow the user to allocate the DMA buffer more than once */
936 if (video->dv_buf.kvirt && video->dv_buf_size != new_buf_size) {
937 printk("dv1394: re-sizing the DMA buffer is not allowed\n");
938 return -EINVAL;
939 }
940
941 /* shutdown the card if it's currently active */
942 /* (the card should not be reset if the parameters are screwy) */
943
944 do_dv1394_shutdown(video, 0);
945
946 /* try to claim the ISO channel */
947 spin_lock_irqsave(&video->ohci->IR_channel_lock, flags);
948 if (video->ohci->ISO_channel_usage & chan_mask) {
949 spin_unlock_irqrestore(&video->ohci->IR_channel_lock, flags);
950 retval = -EBUSY;
951 goto err;
952 }
953 video->ohci->ISO_channel_usage |= chan_mask;
954 spin_unlock_irqrestore(&video->ohci->IR_channel_lock, flags);
955
956 video->channel = init->channel;
957
958 /* initialize misc. fields of video */
959 video->n_frames = init->n_frames;
960 video->pal_or_ntsc = init->format;
961
962 video->cip_accum = 0;
963 video->continuity_counter = 0;
964
965 video->active_frame = -1;
966 video->first_clear_frame = 0;
967 video->n_clear_frames = video->n_frames;
968 video->dropped_frames = 0;
969
970 video->write_off = 0;
971
972 video->first_run = 1;
973 video->current_packet = -1;
974 video->first_frame = 0;
975
976 if (video->pal_or_ntsc == DV1394_NTSC) {
977 video->cip_n = init->cip_n != 0 ? init->cip_n : CIP_N_NTSC;
978 video->cip_d = init->cip_d != 0 ? init->cip_d : CIP_D_NTSC;
979 video->frame_size = DV1394_NTSC_FRAME_SIZE;
980 } else {
981 video->cip_n = init->cip_n != 0 ? init->cip_n : CIP_N_PAL;
982 video->cip_d = init->cip_d != 0 ? init->cip_d : CIP_D_PAL;
983 video->frame_size = DV1394_PAL_FRAME_SIZE;
984 }
985
986 video->syt_offset = init->syt_offset;
987
988 /* find and claim DMA contexts on the OHCI card */
989
990 if (video->ohci_it_ctx == -1) {
991 ohci1394_init_iso_tasklet(&video->it_tasklet, OHCI_ISO_TRANSMIT,
992 it_tasklet_func, (unsigned long) video);
993
994 if (ohci1394_register_iso_tasklet(video->ohci, &video->it_tasklet) < 0) {
995 printk(KERN_ERR "dv1394: could not find an available IT DMA context\n");
996 retval = -EBUSY;
997 goto err;
998 }
999
1000 video->ohci_it_ctx = video->it_tasklet.context;
1001 debug_printk("dv1394: claimed IT DMA context %d\n", video->ohci_it_ctx);
1002 }
1003
1004 if (video->ohci_ir_ctx == -1) {
1005 ohci1394_init_iso_tasklet(&video->ir_tasklet, OHCI_ISO_RECEIVE,
1006 ir_tasklet_func, (unsigned long) video);
1007
1008 if (ohci1394_register_iso_tasklet(video->ohci, &video->ir_tasklet) < 0) {
1009 printk(KERN_ERR "dv1394: could not find an available IR DMA context\n");
1010 retval = -EBUSY;
1011 goto err;
1012 }
1013 video->ohci_ir_ctx = video->ir_tasklet.context;
1014 debug_printk("dv1394: claimed IR DMA context %d\n", video->ohci_ir_ctx);
1015 }
1016
1017 /* allocate struct frames */
1018 for (i = 0; i < init->n_frames; i++) {
1019 video->frames[i] = frame_new(i, video);
1020
1021 if (!video->frames[i]) {
1022 printk(KERN_ERR "dv1394: Cannot allocate frame structs\n");
1023 retval = -ENOMEM;
1024 goto err;
1025 }
1026 }
1027
1028 if (!video->dv_buf.kvirt) {
1029 /* allocate the ringbuffer */
1030 retval = dma_region_alloc(&video->dv_buf, new_buf_size, video->ohci->dev, PCI_DMA_TODEVICE);
1031 if (retval)
1032 goto err;
1033
1034 video->dv_buf_size = new_buf_size;
1035
1036 debug_printk("dv1394: Allocated %d frame buffers, total %u pages (%u DMA pages), %lu bytes\n",
1037 video->n_frames, video->dv_buf.n_pages,
1038 video->dv_buf.n_dma_pages, video->dv_buf_size);
1039 }
1040
1041 /* set up the frame->data pointers */
1042 for (i = 0; i < video->n_frames; i++)
1043 video->frames[i]->data = (unsigned long) video->dv_buf.kvirt + i * video->frame_size;
1044
1045 if (!video->packet_buf.kvirt) {
1046 /* allocate packet buffer */
1047 video->packet_buf_size = sizeof(struct packet) * video->n_frames * MAX_PACKETS;
1048 if (video->packet_buf_size % PAGE_SIZE)
1049 video->packet_buf_size += PAGE_SIZE - (video->packet_buf_size % PAGE_SIZE);
1050
1051 retval = dma_region_alloc(&video->packet_buf, video->packet_buf_size,
1052 video->ohci->dev, PCI_DMA_FROMDEVICE);
1053 if (retval)
1054 goto err;
1055
1056 debug_printk("dv1394: Allocated %d packets in buffer, total %u pages (%u DMA pages), %lu bytes\n",
1057 video->n_frames*MAX_PACKETS, video->packet_buf.n_pages,
1058 video->packet_buf.n_dma_pages, video->packet_buf_size);
1059 }
1060
1061 /* set up register offsets for IT context */
1062 /* IT DMA context registers are spaced 16 bytes apart */
1063 video->ohci_IsoXmitContextControlSet = OHCI1394_IsoXmitContextControlSet+16*video->ohci_it_ctx;
1064 video->ohci_IsoXmitContextControlClear = OHCI1394_IsoXmitContextControlClear+16*video->ohci_it_ctx;
1065 video->ohci_IsoXmitCommandPtr = OHCI1394_IsoXmitCommandPtr+16*video->ohci_it_ctx;
1066
1067 /* enable interrupts for IT context */
1068 reg_write(video->ohci, OHCI1394_IsoXmitIntMaskSet, (1 << video->ohci_it_ctx));
1069 debug_printk("dv1394: interrupts enabled for IT context %d\n", video->ohci_it_ctx);
1070
1071 /* set up register offsets for IR context */
1072 /* IR DMA context registers are spaced 32 bytes apart */
1073 video->ohci_IsoRcvContextControlSet = OHCI1394_IsoRcvContextControlSet+32*video->ohci_ir_ctx;
1074 video->ohci_IsoRcvContextControlClear = OHCI1394_IsoRcvContextControlClear+32*video->ohci_ir_ctx;
1075 video->ohci_IsoRcvCommandPtr = OHCI1394_IsoRcvCommandPtr+32*video->ohci_ir_ctx;
1076 video->ohci_IsoRcvContextMatch = OHCI1394_IsoRcvContextMatch+32*video->ohci_ir_ctx;
1077
1078 /* enable interrupts for IR context */
1079 reg_write(video->ohci, OHCI1394_IsoRecvIntMaskSet, (1 << video->ohci_ir_ctx) );
1080 debug_printk("dv1394: interrupts enabled for IR context %d\n", video->ohci_ir_ctx);
1081
1082 return 0;
1083
1084 err:
1085 do_dv1394_shutdown(video, 1);
1086 return retval;
1087 }
1088
1089 /* if the user doesn't bother to call ioctl(INIT) before starting
1090 mmap() or read()/write(), just give him some default values */
1091
1092 static int do_dv1394_init_default(struct video_card *video)
1093 {
1094 struct dv1394_init init;
1095
1096 init.api_version = DV1394_API_VERSION;
1097 init.n_frames = DV1394_MAX_FRAMES / 4;
1098 init.channel = video->channel;
1099 init.format = video->pal_or_ntsc;
1100 init.cip_n = video->cip_n;
1101 init.cip_d = video->cip_d;
1102 init.syt_offset = video->syt_offset;
1103
1104 return do_dv1394_init(video, &init);
1105 }
1106
1107 /* do NOT call from interrupt context */
1108 static void stop_dma(struct video_card *video)
1109 {
1110 unsigned long flags;
1111 int i;
1112
1113 /* no interrupts */
1114 spin_lock_irqsave(&video->spinlock, flags);
1115
1116 video->dma_running = 0;
1117
1118 if ( (video->ohci_it_ctx == -1) && (video->ohci_ir_ctx == -1) )
1119 goto out;
1120
1121 /* stop DMA if in progress */
1122 if ( (video->active_frame != -1) ||
1123 (reg_read(video->ohci, video->ohci_IsoXmitContextControlClear) & (1 << 10)) ||
1124 (reg_read(video->ohci, video->ohci_IsoRcvContextControlClear) & (1 << 10)) ) {
1125
1126 /* clear the .run bits */
1127 reg_write(video->ohci, video->ohci_IsoXmitContextControlClear, (1 << 15));
1128 reg_write(video->ohci, video->ohci_IsoRcvContextControlClear, (1 << 15));
1129 flush_pci_write(video->ohci);
1130
1131 video->active_frame = -1;
1132 video->first_run = 1;
1133
1134 /* wait until DMA really stops */
1135 i = 0;
1136 while (i < 1000) {
1137
1138 /* wait 0.1 millisecond */
1139 udelay(100);
1140
1141 if ( (reg_read(video->ohci, video->ohci_IsoXmitContextControlClear) & (1 << 10)) ||
1142 (reg_read(video->ohci, video->ohci_IsoRcvContextControlClear) & (1 << 10)) ) {
1143 /* still active */
1144 debug_printk("dv1394: stop_dma: DMA not stopped yet\n" );
1145 mb();
1146 } else {
1147 debug_printk("dv1394: stop_dma: DMA stopped safely after %d ms\n", i/10);
1148 break;
1149 }
1150
1151 i++;
1152 }
1153
1154 if (i == 1000) {
1155 printk(KERN_ERR "dv1394: stop_dma: DMA still going after %d ms!\n", i/10);
1156 }
1157 }
1158 else
1159 debug_printk("dv1394: stop_dma: already stopped.\n");
1160
1161 out:
1162 spin_unlock_irqrestore(&video->spinlock, flags);
1163 }
1164
1165
1166
1167 static void do_dv1394_shutdown(struct video_card *video, int free_dv_buf)
1168 {
1169 int i;
1170
1171 debug_printk("dv1394: shutdown...\n");
1172
1173 /* stop DMA if in progress */
1174 stop_dma(video);
1175
1176 /* release the DMA contexts */
1177 if (video->ohci_it_ctx != -1) {
1178 video->ohci_IsoXmitContextControlSet = 0;
1179 video->ohci_IsoXmitContextControlClear = 0;
1180 video->ohci_IsoXmitCommandPtr = 0;
1181
1182 /* disable interrupts for IT context */
1183 reg_write(video->ohci, OHCI1394_IsoXmitIntMaskClear, (1 << video->ohci_it_ctx));
1184
1185 /* remove tasklet */
1186 ohci1394_unregister_iso_tasklet(video->ohci, &video->it_tasklet);
1187 debug_printk("dv1394: IT context %d released\n", video->ohci_it_ctx);
1188 video->ohci_it_ctx = -1;
1189 }
1190
1191 if (video->ohci_ir_ctx != -1) {
1192 video->ohci_IsoRcvContextControlSet = 0;
1193 video->ohci_IsoRcvContextControlClear = 0;
1194 video->ohci_IsoRcvCommandPtr = 0;
1195 video->ohci_IsoRcvContextMatch = 0;
1196
1197 /* disable interrupts for IR context */
1198 reg_write(video->ohci, OHCI1394_IsoRecvIntMaskClear, (1 << video->ohci_ir_ctx));
1199
1200 /* remove tasklet */
1201 ohci1394_unregister_iso_tasklet(video->ohci, &video->ir_tasklet);
1202 debug_printk("dv1394: IR context %d released\n", video->ohci_ir_ctx);
1203 video->ohci_ir_ctx = -1;
1204 }
1205
1206 /* release the ISO channel */
1207 if (video->channel != -1) {
1208 u64 chan_mask;
1209 unsigned long flags;
1210
1211 chan_mask = (u64)1 << video->channel;
1212
1213 spin_lock_irqsave(&video->ohci->IR_channel_lock, flags);
1214 video->ohci->ISO_channel_usage &= ~(chan_mask);
1215 spin_unlock_irqrestore(&video->ohci->IR_channel_lock, flags);
1216
1217 video->channel = -1;
1218 }
1219
1220 /* free the frame structs */
1221 for (i = 0; i < DV1394_MAX_FRAMES; i++) {
1222 if (video->frames[i])
1223 frame_delete(video->frames[i]);
1224 video->frames[i] = NULL;
1225 }
1226
1227 video->n_frames = 0;
1228
1229 /* we can't free the DMA buffer unless it is guaranteed that
1230 no more user-space mappings exist */
1231
1232 if (free_dv_buf) {
1233 dma_region_free(&video->dv_buf);
1234 video->dv_buf_size = 0;
1235 }
1236
1237 /* free packet buffer */
1238 dma_region_free(&video->packet_buf);
1239 video->packet_buf_size = 0;
1240
1241 debug_printk("dv1394: shutdown OK\n");
1242 }
1243
1244 /*
1245 **********************************
1246 *** MMAP() THEORY OF OPERATION ***
1247 **********************************
1248
1249 The ringbuffer cannot be re-allocated or freed while
1250 a user program maintains a mapping of it. (note that a mapping
1251 can persist even after the device fd is closed!)
1252
1253 So, only let the user process allocate the DMA buffer once.
1254 To resize or deallocate it, you must close the device file
1255 and open it again.
1256
1257 Previously Dan M. hacked out a scheme that allowed the DMA
1258 buffer to change by forcefully unmapping it from the user's
1259 address space. It was prone to error because it's very hard to
1260 track all the places the buffer could have been mapped (we
1261 would have had to walk the vma list of every process in the
1262 system to be sure we found all the mappings!). Instead, we
1263 force the user to choose one buffer size and stick with
1264 it. This small sacrifice is worth the huge reduction in
1265 error-prone code in dv1394.
1266 */
1267
1268 static int dv1394_mmap(struct file *file, struct vm_area_struct *vma)
1269 {
1270 struct video_card *video = file_to_video_card(file);
1271 int retval = -EINVAL;
1272
1273 /* serialize mmap */
1274 down(&video->sem);
1275
1276 if ( ! video_card_initialized(video) ) {
1277 retval = do_dv1394_init_default(video);
1278 if (retval)
1279 goto out;
1280 }
1281
1282 retval = dma_region_mmap(&video->dv_buf, file, vma);
1283 out:
1284 up(&video->sem);
1285 return retval;
1286 }
1287
1288 /*** DEVICE FILE INTERFACE *************************************************/
1289
1290 /* no need to serialize, multiple threads OK */
1291 static unsigned int dv1394_poll(struct file *file, struct poll_table_struct *wait)
1292 {
1293 struct video_card *video = file_to_video_card(file);
1294 unsigned int mask = 0;
1295 unsigned long flags;
1296
1297 poll_wait(file, &video->waitq, wait);
1298
1299 spin_lock_irqsave(&video->spinlock, flags);
1300 if ( video->n_frames == 0 ) {
1301
1302 } else if ( video->active_frame == -1 ) {
1303 /* nothing going on */
1304 mask |= POLLOUT;
1305 } else {
1306 /* any clear/ready buffers? */
1307 if (video->n_clear_frames >0)
1308 mask |= POLLOUT | POLLIN;
1309 }
1310 spin_unlock_irqrestore(&video->spinlock, flags);
1311
1312 return mask;
1313 }
1314
1315 static int dv1394_fasync(int fd, struct file *file, int on)
1316 {
1317 /* I just copied this code verbatim from Alan Cox's mouse driver example
1318 (Documentation/DocBook/) */
1319
1320 struct video_card *video = file_to_video_card(file);
1321
1322 int retval = fasync_helper(fd, file, on, &video->fasync);
1323
1324 if (retval < 0)
1325 return retval;
1326 return 0;
1327 }
1328
1329 static ssize_t dv1394_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
1330 {
1331 struct video_card *video = file_to_video_card(file);
1332 DECLARE_WAITQUEUE(wait, current);
1333 ssize_t ret;
1334 size_t cnt;
1335 unsigned long flags;
1336 int target_frame;
1337
1338 /* serialize this to prevent multi-threaded mayhem */
1339 if (file->f_flags & O_NONBLOCK) {
1340 if (down_trylock(&video->sem))
1341 return -EAGAIN;
1342 } else {
1343 if (down_interruptible(&video->sem))
1344 return -ERESTARTSYS;
1345 }
1346
1347 if ( !video_card_initialized(video) ) {
1348 ret = do_dv1394_init_default(video);
1349 if (ret) {
1350 up(&video->sem);
1351 return ret;
1352 }
1353 }
1354
1355 ret = 0;
1356 add_wait_queue(&video->waitq, &wait);
1357
1358 while (count > 0) {
1359
1360 /* must set TASK_INTERRUPTIBLE *before* checking for free
1361 buffers; otherwise we could miss a wakeup if the interrupt
1362 fires between the check and the schedule() */
1363
1364 set_current_state(TASK_INTERRUPTIBLE);
1365
1366 spin_lock_irqsave(&video->spinlock, flags);
1367
1368 target_frame = video->first_clear_frame;
1369
1370 spin_unlock_irqrestore(&video->spinlock, flags);
1371
1372 if (video->frames[target_frame]->state == FRAME_CLEAR) {
1373
1374 /* how much room is left in the target frame buffer */
1375 cnt = video->frame_size - (video->write_off - target_frame * video->frame_size);
1376
1377 } else {
1378 /* buffer is already used */
1379 cnt = 0;
1380 }
1381
1382 if (cnt > count)
1383 cnt = count;
1384
1385 if (cnt <= 0) {
1386 /* no room left, gotta wait */
1387 if (file->f_flags & O_NONBLOCK) {
1388 if (!ret)
1389 ret = -EAGAIN;
1390 break;
1391 }
1392 if (signal_pending(current)) {
1393 if (!ret)
1394 ret = -ERESTARTSYS;
1395 break;
1396 }
1397
1398 schedule();
1399
1400 continue; /* start over from 'while(count > 0)...' */
1401 }
1402
1403 if (copy_from_user(video->dv_buf.kvirt + video->write_off, buffer, cnt)) {
1404 if (!ret)
1405 ret = -EFAULT;
1406 break;
1407 }
1408
1409 video->write_off = (video->write_off + cnt) % (video->n_frames * video->frame_size);
1410
1411 count -= cnt;
1412 buffer += cnt;
1413 ret += cnt;
1414
1415 if (video->write_off == video->frame_size * ((target_frame + 1) % video->n_frames))
1416 frame_prepare(video, target_frame);
1417 }
1418
1419 remove_wait_queue(&video->waitq, &wait);
1420 set_current_state(TASK_RUNNING);
1421 up(&video->sem);
1422 return ret;
1423 }
1424
1425
1426 static ssize_t dv1394_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
1427 {
1428 struct video_card *video = file_to_video_card(file);
1429 DECLARE_WAITQUEUE(wait, current);
1430 ssize_t ret;
1431 size_t cnt;
1432 unsigned long flags;
1433 int target_frame;
1434
1435 /* serialize this to prevent multi-threaded mayhem */
1436 if (file->f_flags & O_NONBLOCK) {
1437 if (down_trylock(&video->sem))
1438 return -EAGAIN;
1439 } else {
1440 if (down_interruptible(&video->sem))
1441 return -ERESTARTSYS;
1442 }
1443
1444 if ( !video_card_initialized(video) ) {
1445 ret = do_dv1394_init_default(video);
1446 if (ret) {
1447 up(&video->sem);
1448 return ret;
1449 }
1450 video->continuity_counter = -1;
1451
1452 receive_packets(video);
1453
1454 start_dma_receive(video);
1455 }
1456
1457 ret = 0;
1458 add_wait_queue(&video->waitq, &wait);
1459
1460 while (count > 0) {
1461
1462 /* must set TASK_INTERRUPTIBLE *before* checking for free
1463 buffers; otherwise we could miss a wakeup if the interrupt
1464 fires between the check and the schedule() */
1465
1466 set_current_state(TASK_INTERRUPTIBLE);
1467
1468 spin_lock_irqsave(&video->spinlock, flags);
1469
1470 target_frame = video->first_clear_frame;
1471
1472 spin_unlock_irqrestore(&video->spinlock, flags);
1473
1474 if (target_frame >= 0 &&
1475 video->n_clear_frames > 0 &&
1476 video->frames[target_frame]->state == FRAME_CLEAR) {
1477
1478 /* how much room is left in the target frame buffer */
1479 cnt = video->frame_size - (video->write_off - target_frame * video->frame_size);
1480
1481 } else {
1482 /* buffer is already used */
1483 cnt = 0;
1484 }
1485
1486 if (cnt > count)
1487 cnt = count;
1488
1489 if (cnt <= 0) {
1490 /* no room left, gotta wait */
1491 if (file->f_flags & O_NONBLOCK) {
1492 if (!ret)
1493 ret = -EAGAIN;
1494 break;
1495 }
1496 if (signal_pending(current)) {
1497 if (!ret)
1498 ret = -ERESTARTSYS;
1499 break;
1500 }
1501
1502 schedule();
1503
1504 continue; /* start over from 'while(count > 0)...' */
1505 }
1506
1507 if (copy_to_user(buffer, video->dv_buf.kvirt + video->write_off, cnt)) {
1508 if (!ret)
1509 ret = -EFAULT;
1510 break;
1511 }
1512
1513 video->write_off = (video->write_off + cnt) % (video->n_frames * video->frame_size);
1514
1515 count -= cnt;
1516 buffer += cnt;
1517 ret += cnt;
1518
1519 if (video->write_off == video->frame_size * ((target_frame + 1) % video->n_frames)) {
1520 spin_lock_irqsave(&video->spinlock, flags);
1521 video->n_clear_frames--;
1522 video->first_clear_frame = (video->first_clear_frame + 1) % video->n_frames;
1523 spin_unlock_irqrestore(&video->spinlock, flags);
1524 }
1525 }
1526
1527 remove_wait_queue(&video->waitq, &wait);
1528 set_current_state(TASK_RUNNING);
1529 up(&video->sem);
1530 return ret;
1531 }
1532
1533
1534 /*** DEVICE IOCTL INTERFACE ************************************************/
1535
1536 static long dv1394_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1537 {
1538 struct video_card *video;
1539 unsigned long flags;
1540 int ret = -EINVAL;
1541 void __user *argp = (void __user *)arg;
1542
1543 DECLARE_WAITQUEUE(wait, current);
1544
1545 lock_kernel();
1546 video = file_to_video_card(file);
1547
1548 /* serialize this to prevent multi-threaded mayhem */
1549 if (file->f_flags & O_NONBLOCK) {
1550 if (down_trylock(&video->sem)) {
1551 unlock_kernel();
1552 return -EAGAIN;
1553 }
1554 } else {
1555 if (down_interruptible(&video->sem)) {
1556 unlock_kernel();
1557 return -ERESTARTSYS;
1558 }
1559 }
1560
1561 switch(cmd)
1562 {
1563 case DV1394_IOC_SUBMIT_FRAMES: {
1564 unsigned int n_submit;
1565
1566 if ( !video_card_initialized(video) ) {
1567 ret = do_dv1394_init_default(video);
1568 if (ret)
1569 goto out;
1570 }
1571
1572 n_submit = (unsigned int) arg;
1573
1574 if (n_submit > video->n_frames) {
1575 ret = -EINVAL;
1576 goto out;
1577 }
1578
1579 while (n_submit > 0) {
1580
1581 add_wait_queue(&video->waitq, &wait);
1582 set_current_state(TASK_INTERRUPTIBLE);
1583
1584 spin_lock_irqsave(&video->spinlock, flags);
1585
1586 /* wait until video->first_clear_frame is really CLEAR */
1587 while (video->frames[video->first_clear_frame]->state != FRAME_CLEAR) {
1588
1589 spin_unlock_irqrestore(&video->spinlock, flags);
1590
1591 if (signal_pending(current)) {
1592 remove_wait_queue(&video->waitq, &wait);
1593 set_current_state(TASK_RUNNING);
1594 ret = -EINTR;
1595 goto out;
1596 }
1597
1598 schedule();
1599 set_current_state(TASK_INTERRUPTIBLE);
1600
1601 spin_lock_irqsave(&video->spinlock, flags);
1602 }
1603 spin_unlock_irqrestore(&video->spinlock, flags);
1604
1605 remove_wait_queue(&video->waitq, &wait);
1606 set_current_state(TASK_RUNNING);
1607
1608 frame_prepare(video, video->first_clear_frame);
1609
1610 n_submit--;
1611 }
1612
1613 ret = 0;
1614 break;
1615 }
1616
1617 case DV1394_IOC_WAIT_FRAMES: {
1618 unsigned int n_wait;
1619
1620 if ( !video_card_initialized(video) ) {
1621 ret = -EINVAL;
1622 goto out;
1623 }
1624
1625 n_wait = (unsigned int) arg;
1626
1627 /* since we re-run the last frame on underflow, we will
1628 never actually have n_frames clear frames; at most only
1629 n_frames - 1 */
1630
1631 if (n_wait > (video->n_frames-1) ) {
1632 ret = -EINVAL;
1633 goto out;
1634 }
1635
1636 add_wait_queue(&video->waitq, &wait);
1637 set_current_state(TASK_INTERRUPTIBLE);
1638
1639 spin_lock_irqsave(&video->spinlock, flags);
1640
1641 while (video->n_clear_frames < n_wait) {
1642
1643 spin_unlock_irqrestore(&video->spinlock, flags);
1644
1645 if (signal_pending(current)) {
1646 remove_wait_queue(&video->waitq, &wait);
1647 set_current_state(TASK_RUNNING);
1648 ret = -EINTR;
1649 goto out;
1650 }
1651
1652 schedule();
1653 set_current_state(TASK_INTERRUPTIBLE);
1654
1655 spin_lock_irqsave(&video->spinlock, flags);
1656 }
1657
1658 spin_unlock_irqrestore(&video->spinlock, flags);
1659
1660 remove_wait_queue(&video->waitq, &wait);
1661 set_current_state(TASK_RUNNING);
1662 ret = 0;
1663 break;
1664 }
1665
1666 case DV1394_IOC_RECEIVE_FRAMES: {
1667 unsigned int n_recv;
1668
1669 if ( !video_card_initialized(video) ) {
1670 ret = -EINVAL;
1671 goto out;
1672 }
1673
1674 n_recv = (unsigned int) arg;
1675
1676 /* at least one frame must be active */
1677 if (n_recv > (video->n_frames-1) ) {
1678 ret = -EINVAL;
1679 goto out;
1680 }
1681
1682 spin_lock_irqsave(&video->spinlock, flags);
1683
1684 /* release the clear frames */
1685 video->n_clear_frames -= n_recv;
1686
1687 /* advance the clear frame cursor */
1688 video->first_clear_frame = (video->first_clear_frame + n_recv) % video->n_frames;
1689
1690 /* reset dropped_frames */
1691 video->dropped_frames = 0;
1692
1693 spin_unlock_irqrestore(&video->spinlock, flags);
1694
1695 ret = 0;
1696 break;
1697 }
1698
1699 case DV1394_IOC_START_RECEIVE: {
1700 if ( !video_card_initialized(video) ) {
1701 ret = do_dv1394_init_default(video);
1702 if (ret)
1703 goto out;
1704 }
1705
1706 video->continuity_counter = -1;
1707
1708 receive_packets(video);
1709
1710 start_dma_receive(video);
1711
1712 ret = 0;
1713 break;
1714 }
1715
1716 case DV1394_IOC_INIT: {
1717 struct dv1394_init init;
1718 if (!argp) {
1719 ret = do_dv1394_init_default(video);
1720 } else {
1721 if (copy_from_user(&init, argp, sizeof(init))) {
1722 ret = -EFAULT;
1723 goto out;
1724 }
1725 ret = do_dv1394_init(video, &init);
1726 }
1727 break;
1728 }
1729
1730 case DV1394_IOC_SHUTDOWN:
1731 do_dv1394_shutdown(video, 0);
1732 ret = 0;
1733 break;
1734
1735
1736 case DV1394_IOC_GET_STATUS: {
1737 struct dv1394_status status;
1738
1739 if ( !video_card_initialized(video) ) {
1740 ret = -EINVAL;
1741 goto out;
1742 }
1743
1744 status.init.api_version = DV1394_API_VERSION;
1745 status.init.channel = video->channel;
1746 status.init.n_frames = video->n_frames;
1747 status.init.format = video->pal_or_ntsc;
1748 status.init.cip_n = video->cip_n;
1749 status.init.cip_d = video->cip_d;
1750 status.init.syt_offset = video->syt_offset;
1751
1752 status.first_clear_frame = video->first_clear_frame;
1753
1754 /* the rest of the fields need to be locked against the interrupt */
1755 spin_lock_irqsave(&video->spinlock, flags);
1756
1757 status.active_frame = video->active_frame;
1758 status.n_clear_frames = video->n_clear_frames;
1759
1760 status.dropped_frames = video->dropped_frames;
1761
1762 /* reset dropped_frames */
1763 video->dropped_frames = 0;
1764
1765 spin_unlock_irqrestore(&video->spinlock, flags);
1766
1767 if (copy_to_user(argp, &status, sizeof(status))) {
1768 ret = -EFAULT;
1769 goto out;
1770 }
1771
1772 ret = 0;
1773 break;
1774 }
1775
1776 default:
1777 break;
1778 }
1779
1780 out:
1781 up(&video->sem);
1782 unlock_kernel();
1783 return ret;
1784 }
1785
1786 /*** DEVICE FILE INTERFACE CONTINUED ***************************************/
1787
1788 static int dv1394_open(struct inode *inode, struct file *file)
1789 {
1790 struct video_card *video = NULL;
1791
1792 if (file->private_data) {
1793 video = (struct video_card*) file->private_data;
1794
1795 } else {
1796 /* look up the card by ID */
1797 unsigned long flags;
1798
1799 spin_lock_irqsave(&dv1394_cards_lock, flags);
1800 if (!list_empty(&dv1394_cards)) {
1801 struct video_card *p;
1802 list_for_each_entry(p, &dv1394_cards, list) {
1803 if ((p->id) == ieee1394_file_to_instance(file)) {
1804 video = p;
1805 break;
1806 }
1807 }
1808 }
1809 spin_unlock_irqrestore(&dv1394_cards_lock, flags);
1810
1811 if (!video) {
1812 debug_printk("dv1394: OHCI card %d not found", ieee1394_file_to_instance(file));
1813 return -ENODEV;
1814 }
1815
1816 file->private_data = (void*) video;
1817 }
1818
1819 #ifndef DV1394_ALLOW_MORE_THAN_ONE_OPEN
1820
1821 if ( test_and_set_bit(0, &video->open) ) {
1822 /* video is already open by someone else */
1823 return -EBUSY;
1824 }
1825
1826 #endif
1827
1828 return 0;
1829 }
1830
1831
1832 static int dv1394_release(struct inode *inode, struct file *file)
1833 {
1834 struct video_card *video = file_to_video_card(file);
1835
1836 /* OK to free the DMA buffer, no more mappings can exist */
1837 do_dv1394_shutdown(video, 1);
1838
1839 /* clean up async I/O users */
1840 dv1394_fasync(-1, file, 0);
1841
1842 /* give someone else a turn */
1843 clear_bit(0, &video->open);
1844
1845 return 0;
1846 }
1847
1848
1849 /*** DEVICE DRIVER HANDLERS ************************************************/
1850
1851 static void it_tasklet_func(unsigned long data)
1852 {
1853 int wake = 0;
1854 struct video_card *video = (struct video_card*) data;
1855
1856 spin_lock(&video->spinlock);
1857
1858 if (!video->dma_running)
1859 goto out;
1860
1861 irq_printk("ContextControl = %08x, CommandPtr = %08x\n",
1862 reg_read(video->ohci, video->ohci_IsoXmitContextControlSet),
1863 reg_read(video->ohci, video->ohci_IsoXmitCommandPtr)
1864 );
1865
1866
1867 if ( (video->ohci_it_ctx != -1) &&
1868 (reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & (1 << 10)) ) {
1869
1870 struct frame *f;
1871 unsigned int frame, i;
1872
1873
1874 if (video->active_frame == -1)
1875 frame = 0;
1876 else
1877 frame = video->active_frame;
1878
1879 /* check all the DMA-able frames */
1880 for (i = 0; i < video->n_frames; i++, frame = (frame+1) % video->n_frames) {
1881
1882 irq_printk("IRQ checking frame %d...", frame);
1883 f = video->frames[frame];
1884 if (f->state != FRAME_READY) {
1885 irq_printk("clear, skipping\n");
1886 /* we don't own this frame */
1887 continue;
1888 }
1889
1890 irq_printk("DMA\n");
1891
1892 /* check the frame begin semaphore to see if we can free the previous frame */
1893 if ( *(f->frame_begin_timestamp) ) {
1894 int prev_frame;
1895 struct frame *prev_f;
1896
1897
1898
1899 /* don't reset, need this later *(f->frame_begin_timestamp) = 0; */
1900 irq_printk(" BEGIN\n");
1901
1902 prev_frame = frame - 1;
1903 if (prev_frame == -1)
1904 prev_frame += video->n_frames;
1905 prev_f = video->frames[prev_frame];
1906
1907 /* make sure we can actually garbage collect
1908 this frame */
1909 if ( (prev_f->state == FRAME_READY) &&
1910 prev_f->done && (!f->done) )
1911 {
1912 frame_reset(prev_f);
1913 video->n_clear_frames++;
1914 wake = 1;
1915 video->active_frame = frame;
1916
1917 irq_printk(" BEGIN - freeing previous frame %d, new active frame is %d\n", prev_frame, frame);
1918 } else {
1919 irq_printk(" BEGIN - can't free yet\n");
1920 }
1921
1922 f->done = 1;
1923 }
1924
1925
1926 /* see if we need to set the timestamp for the next frame */
1927 if ( *(f->mid_frame_timestamp) ) {
1928 struct frame *next_frame;
1929 u32 begin_ts, ts_cyc, ts_off;
1930
1931 *(f->mid_frame_timestamp) = 0;
1932
1933 begin_ts = le32_to_cpu(*(f->frame_begin_timestamp));
1934
1935 irq_printk(" MIDDLE - first packet was sent at cycle %4u (%2u), assigned timestamp was (%2u) %4u\n",
1936 begin_ts & 0x1FFF, begin_ts & 0xF,
1937 f->assigned_timestamp >> 12, f->assigned_timestamp & 0xFFF);
1938
1939 /* prepare next frame and assign timestamp */
1940 next_frame = video->frames[ (frame+1) % video->n_frames ];
1941
1942 if (next_frame->state == FRAME_READY) {
1943 irq_printk(" MIDDLE - next frame is ready, good\n");
1944 } else {
1945 debug_printk("dv1394: Underflow! At least one frame has been dropped.\n");
1946 next_frame = f;
1947 }
1948
1949 /* set the timestamp to the timestamp of the last frame sent,
1950 plus the length of the last frame sent, plus the syt latency */
1951 ts_cyc = begin_ts & 0xF;
1952 /* advance one frame, plus syt latency (typically 2-3) */
1953 ts_cyc += f->n_packets + video->syt_offset ;
1954
1955 ts_off = 0;
1956
1957 ts_cyc += ts_off/3072;
1958 ts_off %= 3072;
1959
1960 next_frame->assigned_timestamp = ((ts_cyc&0xF) << 12) + ts_off;
1961 if (next_frame->cip_syt1) {
1962 next_frame->cip_syt1->b[6] = next_frame->assigned_timestamp >> 8;
1963 next_frame->cip_syt1->b[7] = next_frame->assigned_timestamp & 0xFF;
1964 }
1965 if (next_frame->cip_syt2) {
1966 next_frame->cip_syt2->b[6] = next_frame->assigned_timestamp >> 8;
1967 next_frame->cip_syt2->b[7] = next_frame->assigned_timestamp & 0xFF;
1968 }
1969
1970 }
1971
1972 /* see if the frame looped */
1973 if ( *(f->frame_end_timestamp) ) {
1974
1975 *(f->frame_end_timestamp) = 0;
1976
1977 debug_printk(" END - the frame looped at least once\n");
1978
1979 video->dropped_frames++;
1980 }
1981
1982 } /* for (each frame) */
1983 }
1984
1985 if (wake) {
1986 kill_fasync(&video->fasync, SIGIO, POLL_OUT);
1987
1988 /* wake readers/writers/ioctl'ers */
1989 wake_up_interruptible(&video->waitq);
1990 }
1991
1992 out:
1993 spin_unlock(&video->spinlock);
1994 }
1995
1996 static void ir_tasklet_func(unsigned long data)
1997 {
1998 int wake = 0;
1999 struct video_card *video = (struct video_card*) data;
2000
2001 spin_lock(&video->spinlock);
2002
2003 if (!video->dma_running)
2004 goto out;
2005
2006 if ( (video->ohci_ir_ctx != -1) &&
2007 (reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & (1 << 10)) ) {
2008
2009 int sof=0; /* start-of-frame flag */
2010 struct frame *f;
2011 u16 packet_length, packet_time;
2012 int i, dbc=0;
2013 struct DMA_descriptor_block *block = NULL;
2014 u16 xferstatus;
2015
2016 int next_i, prev_i;
2017 struct DMA_descriptor_block *next = NULL;
2018 dma_addr_t next_dma = 0;
2019 struct DMA_descriptor_block *prev = NULL;
2020
2021 /* loop over all descriptors in all frames */
2022 for (i = 0; i < video->n_frames*MAX_PACKETS; i++) {
2023 struct packet *p = dma_region_i(&video->packet_buf, struct packet, video->current_packet);
2024
2025 /* make sure we are seeing the latest changes to p */
2026 dma_region_sync_for_cpu(&video->packet_buf,
2027 (unsigned long) p - (unsigned long) video->packet_buf.kvirt,
2028 sizeof(struct packet));
2029
2030 packet_length = le16_to_cpu(p->data_length);
2031 packet_time = le16_to_cpu(p->timestamp);
2032
2033 irq_printk("received packet %02d, timestamp=%04x, length=%04x, sof=%02x%02x\n", video->current_packet,
2034 packet_time, packet_length,
2035 p->data[0], p->data[1]);
2036
2037 /* get the descriptor based on packet_buffer cursor */
2038 f = video->frames[video->current_packet / MAX_PACKETS];
2039 block = &(f->descriptor_pool[video->current_packet % MAX_PACKETS]);
2040 xferstatus = le32_to_cpu(block->u.in.il.q[3]) >> 16;
2041 xferstatus &= 0x1F;
2042 irq_printk("ir_tasklet_func: xferStatus/resCount [%d] = 0x%08x\n", i, le32_to_cpu(block->u.in.il.q[3]) );
2043
2044 /* get the current frame */
2045 f = video->frames[video->active_frame];
2046
2047 /* exclude empty packet */
2048 if (packet_length > 8 && xferstatus == 0x11) {
2049 /* check for start of frame */
2050 /* DRD> Changed to check section type ([0]>>5==0)
2051 and dif sequence ([1]>>4==0) */
2052 sof = ( (p->data[0] >> 5) == 0 && (p->data[1] >> 4) == 0);
2053
2054 dbc = (int) (p->cip_h1 >> 24);
2055 if ( video->continuity_counter != -1 && dbc > ((video->continuity_counter + 1) % 256) )
2056 {
2057 printk(KERN_WARNING "dv1394: discontinuity detected, dropping all frames\n" );
2058 video->dropped_frames += video->n_clear_frames + 1;
2059 video->first_frame = 0;
2060 video->n_clear_frames = 0;
2061 video->first_clear_frame = -1;
2062 }
2063 video->continuity_counter = dbc;
2064
2065 if (!video->first_frame) {
2066 if (sof) {
2067 video->first_frame = 1;
2068 }
2069
2070 } else if (sof) {
2071 /* close current frame */
2072 frame_reset(f); /* f->state = STATE_CLEAR */
2073 video->n_clear_frames++;
2074 if (video->n_clear_frames > video->n_frames) {
2075 video->dropped_frames++;
2076 printk(KERN_WARNING "dv1394: dropped a frame during reception\n" );
2077 video->n_clear_frames = video->n_frames-1;
2078 video->first_clear_frame = (video->first_clear_frame + 1) % video->n_frames;
2079 }
2080 if (video->first_clear_frame == -1)
2081 video->first_clear_frame = video->active_frame;
2082
2083 /* get the next frame */
2084 video->active_frame = (video->active_frame + 1) % video->n_frames;
2085 f = video->frames[video->active_frame];
2086 irq_printk(" frame received, active_frame = %d, n_clear_frames = %d, first_clear_frame = %d\n",
2087 video->active_frame, video->n_clear_frames, video->first_clear_frame);
2088 }
2089 if (video->first_frame) {
2090 if (sof) {
2091 /* open next frame */
2092 f->state = FRAME_READY;
2093 }
2094
2095 /* copy to buffer */
2096 if (f->n_packets > (video->frame_size / 480)) {
2097 printk(KERN_ERR "frame buffer overflow during receive\n");
2098 }
2099
2100 frame_put_packet(f, p);
2101
2102 } /* first_frame */
2103 }
2104
2105 /* stop, end of ready packets */
2106 else if (xferstatus == 0) {
2107 break;
2108 }
2109
2110 /* reset xferStatus & resCount */
2111 block->u.in.il.q[3] = cpu_to_le32(512);
2112
2113 /* terminate dma chain at this (next) packet */
2114 next_i = video->current_packet;
2115 f = video->frames[next_i / MAX_PACKETS];
2116 next = &(f->descriptor_pool[next_i % MAX_PACKETS]);
2117 next_dma = ((unsigned long) block - (unsigned long) f->descriptor_pool) + f->descriptor_pool_dma;
2118 next->u.in.il.q[0] |= 3 << 20; /* enable interrupt */
2119 next->u.in.il.q[2] = 0; /* disable branch */
2120
2121 /* link previous to next */
2122 prev_i = (next_i == 0) ? (MAX_PACKETS * video->n_frames - 1) : (next_i - 1);
2123 f = video->frames[prev_i / MAX_PACKETS];
2124 prev = &(f->descriptor_pool[prev_i % MAX_PACKETS]);
2125 if (prev_i % (MAX_PACKETS/2)) {
2126 prev->u.in.il.q[0] &= ~(3 << 20); /* no interrupt */
2127 } else {
2128 prev->u.in.il.q[0] |= 3 << 20; /* enable interrupt */
2129 }
2130 prev->u.in.il.q[2] = cpu_to_le32(next_dma | 1); /* set Z=1 */
2131 wmb();
2132
2133 /* wake up DMA in case it fell asleep */
2134 reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 12));
2135
2136 /* advance packet_buffer cursor */
2137 video->current_packet = (video->current_packet + 1) % (MAX_PACKETS * video->n_frames);
2138
2139 } /* for all packets */
2140
2141 wake = 1; /* why the hell not? */
2142
2143 } /* receive interrupt */
2144
2145 if (wake) {
2146 kill_fasync(&video->fasync, SIGIO, POLL_IN);
2147
2148 /* wake readers/writers/ioctl'ers */
2149 wake_up_interruptible(&video->waitq);
2150 }
2151
2152 out:
2153 spin_unlock(&video->spinlock);
2154 }
2155
2156 static struct cdev dv1394_cdev;
2157 static struct file_operations dv1394_fops=
2158 {
2159 .owner = THIS_MODULE,
2160 .poll = dv1394_poll,
2161 .unlocked_ioctl = dv1394_ioctl,
2162 #ifdef CONFIG_COMPAT
2163 .compat_ioctl = dv1394_compat_ioctl,
2164 #endif
2165 .mmap = dv1394_mmap,
2166 .open = dv1394_open,
2167 .write = dv1394_write,
2168 .read = dv1394_read,
2169 .release = dv1394_release,
2170 .fasync = dv1394_fasync,
2171 };
2172
2173
2174 /*** HOTPLUG STUFF **********************************************************/
2175 /*
2176 * Export information about protocols/devices supported by this driver.
2177 */
2178 static struct ieee1394_device_id dv1394_id_table[] = {
2179 {
2180 .match_flags = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION,
2181 .specifier_id = AVC_UNIT_SPEC_ID_ENTRY & 0xffffff,
2182 .version = AVC_SW_VERSION_ENTRY & 0xffffff
2183 },
2184 { }
2185 };
2186
2187 MODULE_DEVICE_TABLE(ieee1394, dv1394_id_table);
2188
2189 static struct hpsb_protocol_driver dv1394_driver = {
2190 .name = "DV/1394 Driver",
2191 .id_table = dv1394_id_table,
2192 .driver = {
2193 .name = "dv1394",
2194 .bus = &ieee1394_bus_type,
2195 },
2196 };
2197
2198
2199 /*** IEEE1394 HPSB CALLBACKS ***********************************************/
2200
2201 static int dv1394_init(struct ti_ohci *ohci, enum pal_or_ntsc format, enum modes mode)
2202 {
2203 struct video_card *video;
2204 unsigned long flags;
2205 int i;
2206
2207 video = kzalloc(sizeof(*video), GFP_KERNEL);
2208 if (!video) {
2209 printk(KERN_ERR "dv1394: cannot allocate video_card\n");
2210 return -1;
2211 }
2212
2213 video->ohci = ohci;
2214 /* lower 2 bits of id indicate which of four "plugs"
2215 per host */
2216 video->id = ohci->host->id << 2;
2217 if (format == DV1394_NTSC)
2218 video->id |= mode;
2219 else
2220 video->id |= 2 + mode;
2221
2222 video->ohci_it_ctx = -1;
2223 video->ohci_ir_ctx = -1;
2224
2225 video->ohci_IsoXmitContextControlSet = 0;
2226 video->ohci_IsoXmitContextControlClear = 0;
2227 video->ohci_IsoXmitCommandPtr = 0;
2228
2229 video->ohci_IsoRcvContextControlSet = 0;
2230 video->ohci_IsoRcvContextControlClear = 0;
2231 video->ohci_IsoRcvCommandPtr = 0;
2232 video->ohci_IsoRcvContextMatch = 0;
2233
2234 video->n_frames = 0; /* flag that video is not initialized */
2235 video->channel = 63; /* default to broadcast channel */
2236 video->active_frame = -1;
2237
2238 /* initialize the following */
2239 video->pal_or_ntsc = format;
2240 video->cip_n = 0; /* 0 = use builtin default */
2241 video->cip_d = 0;
2242 video->syt_offset = 0;
2243 video->mode = mode;
2244
2245 for (i = 0; i < DV1394_MAX_FRAMES; i++)
2246 video->frames[i] = NULL;
2247
2248 dma_region_init(&video->dv_buf);
2249 video->dv_buf_size = 0;
2250 dma_region_init(&video->packet_buf);
2251 video->packet_buf_size = 0;
2252
2253 clear_bit(0, &video->open);
2254 spin_lock_init(&video->spinlock);
2255 video->dma_running = 0;
2256 init_MUTEX(&video->sem);
2257 init_waitqueue_head(&video->waitq);
2258 video->fasync = NULL;
2259
2260 spin_lock_irqsave(&dv1394_cards_lock, flags);
2261 INIT_LIST_HEAD(&video->list);
2262 list_add_tail(&video->list, &dv1394_cards);
2263 spin_unlock_irqrestore(&dv1394_cards_lock, flags);
2264
2265 debug_printk("dv1394: dv1394_init() OK on ID %d\n", video->id);
2266 return 0;
2267 }
2268
2269 static void dv1394_un_init(struct video_card *video)
2270 {
2271 /* obviously nobody has the driver open at this point */
2272 do_dv1394_shutdown(video, 1);
2273 kfree(video);
2274 }
2275
2276
2277 static void dv1394_remove_host (struct hpsb_host *host)
2278 {
2279 struct video_card *video;
2280 unsigned long flags;
2281 int id = host->id;
2282
2283 /* We only work with the OHCI-1394 driver */
2284 if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME))
2285 return;
2286
2287 /* find the corresponding video_cards */
2288 do {
2289 struct video_card *tmp_vid;
2290
2291 video = NULL;
2292
2293 spin_lock_irqsave(&dv1394_cards_lock, flags);
2294 list_for_each_entry(tmp_vid, &dv1394_cards, list) {
2295 if ((tmp_vid->id >> 2) == id) {
2296 list_del(&tmp_vid->list);
2297 video = tmp_vid;
2298 break;
2299 }
2300 }
2301 spin_unlock_irqrestore(&dv1394_cards_lock, flags);
2302
2303 if (video)
2304 dv1394_un_init(video);
2305 } while (video != NULL);
2306
2307 class_device_destroy(hpsb_protocol_class,
2308 MKDEV(IEEE1394_MAJOR, IEEE1394_MINOR_BLOCK_DV1394 * 16 + (id<<2)));
2309 }
2310
2311 static void dv1394_add_host (struct hpsb_host *host)
2312 {
2313 struct ti_ohci *ohci;
2314 int id = host->id;
2315
2316 /* We only work with the OHCI-1394 driver */
2317 if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME))
2318 return;
2319
2320 ohci = (struct ti_ohci *)host->hostdata;
2321
2322 class_device_create(hpsb_protocol_class, NULL, MKDEV(
2323 IEEE1394_MAJOR, IEEE1394_MINOR_BLOCK_DV1394 * 16 + (id<<2)),
2324 NULL, "dv1394-%d", id);
2325
2326 dv1394_init(ohci, DV1394_NTSC, MODE_RECEIVE);
2327 dv1394_init(ohci, DV1394_NTSC, MODE_TRANSMIT);
2328 dv1394_init(ohci, DV1394_PAL, MODE_RECEIVE);
2329 dv1394_init(ohci, DV1394_PAL, MODE_TRANSMIT);
2330 }
2331
2332
2333 /* Bus reset handler. In the event of a bus reset, we may need to
2334 re-start the DMA contexts - otherwise the user program would
2335 end up waiting forever.
2336 */
2337
2338 static void dv1394_host_reset(struct hpsb_host *host)
2339 {
2340 struct ti_ohci *ohci;
2341 struct video_card *video = NULL, *tmp_vid;
2342 unsigned long flags;
2343
2344 /* We only work with the OHCI-1394 driver */
2345 if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME))
2346 return;
2347
2348 ohci = (struct ti_ohci *)host->hostdata;
2349
2350
2351 /* find the corresponding video_cards */
2352 spin_lock_irqsave(&dv1394_cards_lock, flags);
2353 list_for_each_entry(tmp_vid, &dv1394_cards, list) {
2354 if ((tmp_vid->id >> 2) == host->id) {
2355 video = tmp_vid;
2356 break;
2357 }
2358 }
2359 spin_unlock_irqrestore(&dv1394_cards_lock, flags);
2360
2361 if (!video)
2362 return;
2363
2364
2365 spin_lock_irqsave(&video->spinlock, flags);
2366
2367 if (!video->dma_running)
2368 goto out;
2369
2370 /* check IT context */
2371 if (video->ohci_it_ctx != -1) {
2372 u32 ctx;
2373
2374 ctx = reg_read(video->ohci, video->ohci_IsoXmitContextControlSet);
2375
2376 /* if (RUN but not ACTIVE) */
2377 if ( (ctx & (1<<15)) &&
2378 !(ctx & (1<<10)) ) {
2379
2380 debug_printk("dv1394: IT context stopped due to bus reset; waking it up\n");
2381
2382 /* to be safe, assume a frame has been dropped. User-space programs
2383 should handle this condition like an underflow. */
2384 video->dropped_frames++;
2385
2386 /* for some reason you must clear, then re-set the RUN bit to restart DMA */
2387
2388 /* clear RUN */
2389 reg_write(video->ohci, video->ohci_IsoXmitContextControlClear, (1 << 15));
2390 flush_pci_write(video->ohci);
2391
2392 /* set RUN */
2393 reg_write(video->ohci, video->ohci_IsoXmitContextControlSet, (1 << 15));
2394 flush_pci_write(video->ohci);
2395
2396 /* set the WAKE bit (just in case; this isn't strictly necessary) */
2397 reg_write(video->ohci, video->ohci_IsoXmitContextControlSet, (1 << 12));
2398 flush_pci_write(video->ohci);
2399
2400 irq_printk("dv1394: AFTER IT restart ctx 0x%08x ptr 0x%08x\n",
2401 reg_read(video->ohci, video->ohci_IsoXmitContextControlSet),
2402 reg_read(video->ohci, video->ohci_IsoXmitCommandPtr));
2403 }
2404 }
2405
2406 /* check IR context */
2407 if (video->ohci_ir_ctx != -1) {
2408 u32 ctx;
2409
2410 ctx = reg_read(video->ohci, video->ohci_IsoRcvContextControlSet);
2411
2412 /* if (RUN but not ACTIVE) */
2413 if ( (ctx & (1<<15)) &&
2414 !(ctx & (1<<10)) ) {
2415
2416 debug_printk("dv1394: IR context stopped due to bus reset; waking it up\n");
2417
2418 /* to be safe, assume a frame has been dropped. User-space programs
2419 should handle this condition like an overflow. */
2420 video->dropped_frames++;
2421
2422 /* for some reason you must clear, then re-set the RUN bit to restart DMA */
2423 /* XXX this doesn't work for me, I can't get IR DMA to restart :[ */
2424
2425 /* clear RUN */
2426 reg_write(video->ohci, video->ohci_IsoRcvContextControlClear, (1 << 15));
2427 flush_pci_write(video->ohci);
2428
2429 /* set RUN */
2430 reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 15));
2431 flush_pci_write(video->ohci);
2432
2433 /* set the WAKE bit (just in case; this isn't strictly necessary) */
2434 reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 12));
2435 flush_pci_write(video->ohci);
2436
2437 irq_printk("dv1394: AFTER IR restart ctx 0x%08x ptr 0x%08x\n",
2438 reg_read(video->ohci, video->ohci_IsoRcvContextControlSet),
2439 reg_read(video->ohci, video->ohci_IsoRcvCommandPtr));
2440 }
2441 }
2442
2443 out:
2444 spin_unlock_irqrestore(&video->spinlock, flags);
2445
2446 /* wake readers/writers/ioctl'ers */
2447 wake_up_interruptible(&video->waitq);
2448 }
2449
2450 static struct hpsb_highlevel dv1394_highlevel = {
2451 .name = "dv1394",
2452 .add_host = dv1394_add_host,
2453 .remove_host = dv1394_remove_host,
2454 .host_reset = dv1394_host_reset,
2455 };
2456
2457 #ifdef CONFIG_COMPAT
2458
2459 #define DV1394_IOC32_INIT _IOW('#', 0x06, struct dv1394_init32)
2460 #define DV1394_IOC32_GET_STATUS _IOR('#', 0x0c, struct dv1394_status32)
2461
2462 struct dv1394_init32 {
2463 u32 api_version;
2464 u32 channel;
2465 u32 n_frames;
2466 u32 format;
2467 u32 cip_n;
2468 u32 cip_d;
2469 u32 syt_offset;
2470 };
2471
2472 struct dv1394_status32 {
2473 struct dv1394_init32 init;
2474 s32 active_frame;
2475 u32 first_clear_frame;
2476 u32 n_clear_frames;
2477 u32 dropped_frames;
2478 };
2479
2480 /* RED-PEN: this should use compat_alloc_userspace instead */
2481
2482 static int handle_dv1394_init(struct file *file, unsigned int cmd, unsigned long arg)
2483 {
2484 struct dv1394_init32 dv32;
2485 struct dv1394_init dv;
2486 mm_segment_t old_fs;
2487 int ret;
2488
2489 if (file->f_op->unlocked_ioctl != dv1394_ioctl)
2490 return -EFAULT;
2491
2492 if (copy_from_user(&dv32, (void __user *)arg, sizeof(dv32)))
2493 return -EFAULT;
2494
2495 dv.api_version = dv32.api_version;
2496 dv.channel = dv32.channel;
2497 dv.n_frames = dv32.n_frames;
2498 dv.format = dv32.format;
2499 dv.cip_n = (unsigned long)dv32.cip_n;
2500 dv.cip_d = (unsigned long)dv32.cip_d;
2501 dv.syt_offset = dv32.syt_offset;
2502
2503 old_fs = get_fs();
2504 set_fs(KERNEL_DS);
2505 ret = dv1394_ioctl(file, DV1394_IOC_INIT, (unsigned long)&dv);
2506 set_fs(old_fs);
2507
2508 return ret;
2509 }
2510
2511 static int handle_dv1394_get_status(struct file *file, unsigned int cmd, unsigned long arg)
2512 {
2513 struct dv1394_status32 dv32;
2514 struct dv1394_status dv;
2515 mm_segment_t old_fs;
2516 int ret;
2517
2518 if (file->f_op->unlocked_ioctl != dv1394_ioctl)
2519 return -EFAULT;
2520
2521 old_fs = get_fs();
2522 set_fs(KERNEL_DS);
2523 ret = dv1394_ioctl(file, DV1394_IOC_GET_STATUS, (unsigned long)&dv);
2524 set_fs(old_fs);
2525
2526 if (!ret) {
2527 dv32.init.api_version = dv.init.api_version;
2528 dv32.init.channel = dv.init.channel;
2529 dv32.init.n_frames = dv.init.n_frames;
2530 dv32.init.format = dv.init.format;
2531 dv32.init.cip_n = (u32)dv.init.cip_n;
2532 dv32.init.cip_d = (u32)dv.init.cip_d;
2533 dv32.init.syt_offset = dv.init.syt_offset;
2534 dv32.active_frame = dv.active_frame;
2535 dv32.first_clear_frame = dv.first_clear_frame;
2536 dv32.n_clear_frames = dv.n_clear_frames;
2537 dv32.dropped_frames = dv.dropped_frames;
2538
2539 if (copy_to_user((struct dv1394_status32 __user *)arg, &dv32, sizeof(dv32)))
2540 ret = -EFAULT;
2541 }
2542
2543 return ret;
2544 }
2545
2546
2547
2548 static long dv1394_compat_ioctl(struct file *file, unsigned int cmd,
2549 unsigned long arg)
2550 {
2551 switch (cmd) {
2552 case DV1394_IOC_SHUTDOWN:
2553 case DV1394_IOC_SUBMIT_FRAMES:
2554 case DV1394_IOC_WAIT_FRAMES:
2555 case DV1394_IOC_RECEIVE_FRAMES:
2556 case DV1394_IOC_START_RECEIVE:
2557 return dv1394_ioctl(file, cmd, arg);
2558
2559 case DV1394_IOC32_INIT:
2560 return handle_dv1394_init(file, cmd, arg);
2561 case DV1394_IOC32_GET_STATUS:
2562 return handle_dv1394_get_status(file, cmd, arg);
2563 default:
2564 return -ENOIOCTLCMD;
2565 }
2566 }
2567
2568 #endif /* CONFIG_COMPAT */
2569
2570
2571 /*** KERNEL MODULE HANDLERS ************************************************/
2572
2573 MODULE_AUTHOR("Dan Maas <dmaas@dcine.com>, Dan Dennedy <dan@dennedy.org>");
2574 MODULE_DESCRIPTION("driver for DV input/output on OHCI board");
2575 MODULE_SUPPORTED_DEVICE("dv1394");
2576 MODULE_LICENSE("GPL");
2577
2578 static void __exit dv1394_exit_module(void)
2579 {
2580 hpsb_unregister_protocol(&dv1394_driver);
2581 hpsb_unregister_highlevel(&dv1394_highlevel);
2582 cdev_del(&dv1394_cdev);
2583 }
2584
2585 static int __init dv1394_init_module(void)
2586 {
2587 int ret;
2588
2589 cdev_init(&dv1394_cdev, &dv1394_fops);
2590 dv1394_cdev.owner = THIS_MODULE;
2591 kobject_set_name(&dv1394_cdev.kobj, "dv1394");
2592 ret = cdev_add(&dv1394_cdev, IEEE1394_DV1394_DEV, 16);
2593 if (ret) {
2594 printk(KERN_ERR "dv1394: unable to register character device\n");
2595 return ret;
2596 }
2597
2598 hpsb_register_highlevel(&dv1394_highlevel);
2599
2600 ret = hpsb_register_protocol(&dv1394_driver);
2601 if (ret) {
2602 printk(KERN_ERR "dv1394: failed to register protocol\n");
2603 hpsb_unregister_highlevel(&dv1394_highlevel);
2604 cdev_del(&dv1394_cdev);
2605 return ret;
2606 }
2607
2608 return 0;
2609 }
2610
2611 module_init(dv1394_init_module);
2612 module_exit(dv1394_exit_module);
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