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1da177e4 LT |
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 | - devfs and character device dispatching (* needs testing with Linux 2.2.x) | |
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/config.h> | |
87 | #include <linux/kernel.h> | |
88 | #include <linux/list.h> | |
89 | #include <linux/slab.h> | |
90 | #include <linux/interrupt.h> | |
91 | #include <linux/wait.h> | |
92 | #include <linux/errno.h> | |
93 | #include <linux/module.h> | |
94 | #include <linux/init.h> | |
95 | #include <linux/pci.h> | |
96 | #include <linux/fs.h> | |
97 | #include <linux/poll.h> | |
98 | #include <linux/smp_lock.h> | |
99 | #include <linux/bitops.h> | |
100 | #include <asm/byteorder.h> | |
101 | #include <asm/atomic.h> | |
102 | #include <asm/io.h> | |
103 | #include <asm/uaccess.h> | |
104 | #include <linux/delay.h> | |
105 | #include <asm/pgtable.h> | |
106 | #include <asm/page.h> | |
107 | #include <linux/sched.h> | |
108 | #include <linux/types.h> | |
109 | #include <linux/vmalloc.h> | |
110 | #include <linux/string.h> | |
111 | #include <linux/ioctl32.h> | |
112 | #include <linux/compat.h> | |
113 | #include <linux/cdev.h> | |
114 | ||
115 | #include "ieee1394.h" | |
116 | #include "ieee1394_types.h" | |
117 | #include "nodemgr.h" | |
118 | #include "hosts.h" | |
119 | #include "ieee1394_core.h" | |
120 | #include "highlevel.h" | |
121 | #include "dv1394.h" | |
122 | #include "dv1394-private.h" | |
123 | ||
124 | #include "ohci1394.h" | |
125 | ||
126 | #ifndef virt_to_page | |
127 | #define virt_to_page(x) MAP_NR(x) | |
128 | #endif | |
129 | ||
130 | #ifndef vmalloc_32 | |
131 | #define vmalloc_32(x) vmalloc(x) | |
132 | #endif | |
133 | ||
134 | ||
135 | /* DEBUG LEVELS: | |
136 | 0 - no debugging messages | |
137 | 1 - some debugging messages, but none during DMA frame transmission | |
138 | 2 - lots of messages, including during DMA frame transmission | |
139 | (will cause undeflows if your machine is too slow!) | |
140 | */ | |
141 | ||
142 | #define DV1394_DEBUG_LEVEL 0 | |
143 | ||
144 | /* for debugging use ONLY: allow more than one open() of the device */ | |
145 | /* #define DV1394_ALLOW_MORE_THAN_ONE_OPEN 1 */ | |
146 | ||
147 | #if DV1394_DEBUG_LEVEL >= 2 | |
148 | #define irq_printk( args... ) printk( args ) | |
149 | #else | |
150 | #define irq_printk( args... ) | |
151 | #endif | |
152 | ||
153 | #if DV1394_DEBUG_LEVEL >= 1 | |
154 | #define debug_printk( args... ) printk( args) | |
155 | #else | |
156 | #define debug_printk( args... ) | |
157 | #endif | |
158 | ||
159 | /* issue a dummy PCI read to force the preceding write | |
160 | to be posted to the PCI bus immediately */ | |
161 | ||
162 | static inline void flush_pci_write(struct ti_ohci *ohci) | |
163 | { | |
164 | mb(); | |
165 | reg_read(ohci, OHCI1394_IsochronousCycleTimer); | |
166 | } | |
167 | ||
168 | static void it_tasklet_func(unsigned long data); | |
169 | static void ir_tasklet_func(unsigned long data); | |
170 | ||
171 | #ifdef CONFIG_COMPAT | |
172 | static long dv1394_compat_ioctl(struct file *file, unsigned int cmd, | |
173 | unsigned long arg); | |
174 | #endif | |
175 | ||
176 | /* GLOBAL DATA */ | |
177 | ||
178 | /* list of all video_cards */ | |
179 | static LIST_HEAD(dv1394_cards); | |
180 | static DEFINE_SPINLOCK(dv1394_cards_lock); | |
181 | ||
182 | /* translate from a struct file* to the corresponding struct video_card* */ | |
183 | ||
184 | static inline struct video_card* file_to_video_card(struct file *file) | |
185 | { | |
186 | return (struct video_card*) file->private_data; | |
187 | } | |
188 | ||
189 | /*** FRAME METHODS *********************************************************/ | |
190 | ||
191 | static void frame_reset(struct frame *f) | |
192 | { | |
193 | f->state = FRAME_CLEAR; | |
194 | f->done = 0; | |
195 | f->n_packets = 0; | |
196 | f->frame_begin_timestamp = NULL; | |
197 | f->assigned_timestamp = 0; | |
198 | f->cip_syt1 = NULL; | |
199 | f->cip_syt2 = NULL; | |
200 | f->mid_frame_timestamp = NULL; | |
201 | f->frame_end_timestamp = NULL; | |
202 | f->frame_end_branch = NULL; | |
203 | } | |
204 | ||
205 | static struct frame* frame_new(unsigned int frame_num, struct video_card *video) | |
206 | { | |
207 | struct frame *f = kmalloc(sizeof(*f), GFP_KERNEL); | |
208 | if (!f) | |
209 | return NULL; | |
210 | ||
211 | f->video = video; | |
212 | f->frame_num = frame_num; | |
213 | ||
214 | f->header_pool = pci_alloc_consistent(f->video->ohci->dev, PAGE_SIZE, &f->header_pool_dma); | |
215 | if (!f->header_pool) { | |
216 | printk(KERN_ERR "dv1394: failed to allocate CIP header pool\n"); | |
217 | kfree(f); | |
218 | return NULL; | |
219 | } | |
220 | ||
221 | debug_printk("dv1394: frame_new: allocated CIP header pool at virt 0x%08lx (contig) dma 0x%08lx size %ld\n", | |
222 | (unsigned long) f->header_pool, (unsigned long) f->header_pool_dma, PAGE_SIZE); | |
223 | ||
224 | f->descriptor_pool_size = MAX_PACKETS * sizeof(struct DMA_descriptor_block); | |
225 | /* make it an even # of pages */ | |
226 | f->descriptor_pool_size += PAGE_SIZE - (f->descriptor_pool_size%PAGE_SIZE); | |
227 | ||
228 | f->descriptor_pool = pci_alloc_consistent(f->video->ohci->dev, | |
229 | f->descriptor_pool_size, | |
230 | &f->descriptor_pool_dma); | |
231 | if (!f->descriptor_pool) { | |
232 | pci_free_consistent(f->video->ohci->dev, PAGE_SIZE, f->header_pool, f->header_pool_dma); | |
233 | kfree(f); | |
234 | return NULL; | |
235 | } | |
236 | ||
237 | debug_printk("dv1394: frame_new: allocated DMA program memory at virt 0x%08lx (contig) dma 0x%08lx size %ld\n", | |
238 | (unsigned long) f->descriptor_pool, (unsigned long) f->descriptor_pool_dma, f->descriptor_pool_size); | |
239 | ||
240 | f->data = 0; | |
241 | frame_reset(f); | |
242 | ||
243 | return f; | |
244 | } | |
245 | ||
246 | static void frame_delete(struct frame *f) | |
247 | { | |
248 | pci_free_consistent(f->video->ohci->dev, PAGE_SIZE, f->header_pool, f->header_pool_dma); | |
249 | pci_free_consistent(f->video->ohci->dev, f->descriptor_pool_size, f->descriptor_pool, f->descriptor_pool_dma); | |
250 | kfree(f); | |
251 | } | |
252 | ||
253 | ||
254 | ||
255 | ||
256 | /* | |
257 | frame_prepare() - build the DMA program for transmitting | |
258 | ||
259 | Frame_prepare() must be called OUTSIDE the video->spinlock. | |
260 | However, frame_prepare() must still be serialized, so | |
261 | it should be called WITH the video->sem taken. | |
262 | */ | |
263 | ||
264 | static void frame_prepare(struct video_card *video, unsigned int this_frame) | |
265 | { | |
266 | struct frame *f = video->frames[this_frame]; | |
267 | int last_frame; | |
268 | ||
269 | struct DMA_descriptor_block *block; | |
270 | dma_addr_t block_dma; | |
271 | struct CIP_header *cip; | |
272 | dma_addr_t cip_dma; | |
273 | ||
274 | unsigned int n_descriptors, full_packets, packets_per_frame, payload_size; | |
275 | ||
276 | /* these flags denote packets that need special attention */ | |
277 | int empty_packet, first_packet, last_packet, mid_packet; | |
278 | ||
279 | u32 *branch_address, *last_branch_address = NULL; | |
280 | unsigned long data_p; | |
281 | int first_packet_empty = 0; | |
282 | u32 cycleTimer, ct_sec, ct_cyc, ct_off; | |
283 | unsigned long irq_flags; | |
284 | ||
285 | irq_printk("frame_prepare( %d ) ---------------------\n", this_frame); | |
286 | ||
287 | full_packets = 0; | |
288 | ||
289 | ||
290 | ||
291 | if (video->pal_or_ntsc == DV1394_PAL) | |
292 | packets_per_frame = DV1394_PAL_PACKETS_PER_FRAME; | |
293 | else | |
294 | packets_per_frame = DV1394_NTSC_PACKETS_PER_FRAME; | |
295 | ||
296 | while ( full_packets < packets_per_frame ) { | |
297 | empty_packet = first_packet = last_packet = mid_packet = 0; | |
298 | ||
299 | data_p = f->data + full_packets * 480; | |
300 | ||
301 | /************************************************/ | |
302 | /* allocate a descriptor block and a CIP header */ | |
303 | /************************************************/ | |
304 | ||
305 | /* note: these should NOT cross a page boundary (DMA restriction) */ | |
306 | ||
307 | if (f->n_packets >= MAX_PACKETS) { | |
308 | printk(KERN_ERR "dv1394: FATAL ERROR: max packet count exceeded\n"); | |
309 | return; | |
310 | } | |
311 | ||
312 | /* the block surely won't cross a page boundary, | |
313 | since an even number of descriptor_blocks fit on a page */ | |
314 | block = &(f->descriptor_pool[f->n_packets]); | |
315 | ||
316 | /* DMA address of the block = offset of block relative | |
317 | to the kernel base address of the descriptor pool | |
318 | + DMA base address of the descriptor pool */ | |
319 | block_dma = ((unsigned long) block - (unsigned long) f->descriptor_pool) + f->descriptor_pool_dma; | |
320 | ||
321 | ||
322 | /* the whole CIP pool fits on one page, so no worries about boundaries */ | |
323 | if ( ((unsigned long) &(f->header_pool[f->n_packets]) - (unsigned long) f->header_pool) | |
324 | > PAGE_SIZE) { | |
325 | printk(KERN_ERR "dv1394: FATAL ERROR: no room to allocate CIP header\n"); | |
326 | return; | |
327 | } | |
328 | ||
329 | cip = &(f->header_pool[f->n_packets]); | |
330 | ||
331 | /* DMA address of the CIP header = offset of cip | |
332 | relative to kernel base address of the header pool | |
333 | + DMA base address of the header pool */ | |
334 | cip_dma = (unsigned long) cip % PAGE_SIZE + f->header_pool_dma; | |
335 | ||
336 | /* is this an empty packet? */ | |
337 | ||
338 | if (video->cip_accum > (video->cip_d - video->cip_n)) { | |
339 | empty_packet = 1; | |
340 | payload_size = 8; | |
341 | video->cip_accum -= (video->cip_d - video->cip_n); | |
342 | } else { | |
343 | payload_size = 488; | |
344 | video->cip_accum += video->cip_n; | |
345 | } | |
346 | ||
347 | /* there are three important packets each frame: | |
348 | ||
349 | the first packet in the frame - we ask the card to record the timestamp when | |
350 | this packet is actually sent, so we can monitor | |
351 | how accurate our timestamps are. Also, the first | |
352 | packet serves as a semaphore to let us know that | |
353 | it's OK to free the *previous* frame's DMA buffer | |
354 | ||
355 | the last packet in the frame - this packet is used to detect buffer underflows. | |
356 | if this is the last ready frame, the last DMA block | |
357 | will have a branch back to the beginning of the frame | |
358 | (so that the card will re-send the frame on underflow). | |
359 | if this branch gets taken, we know that at least one | |
360 | frame has been dropped. When the next frame is ready, | |
361 | the branch is pointed to its first packet, and the | |
362 | semaphore is disabled. | |
363 | ||
364 | a "mid" packet slightly before the end of the frame - this packet should trigger | |
365 | an interrupt so we can go and assign a timestamp to the first packet | |
366 | in the next frame. We don't use the very last packet in the frame | |
367 | for this purpose, because that would leave very little time to set | |
368 | the timestamp before DMA starts on the next frame. | |
369 | */ | |
370 | ||
371 | if (f->n_packets == 0) { | |
372 | first_packet = 1; | |
373 | } else if ( full_packets == (packets_per_frame-1) ) { | |
374 | last_packet = 1; | |
375 | } else if (f->n_packets == packets_per_frame) { | |
376 | mid_packet = 1; | |
377 | } | |
378 | ||
379 | ||
380 | /********************/ | |
381 | /* setup CIP header */ | |
382 | /********************/ | |
383 | ||
384 | /* the timestamp will be written later from the | |
385 | mid-frame interrupt handler. For now we just | |
386 | store the address of the CIP header(s) that | |
387 | need a timestamp. */ | |
388 | ||
389 | /* first packet in the frame needs a timestamp */ | |
390 | if (first_packet) { | |
391 | f->cip_syt1 = cip; | |
392 | if (empty_packet) | |
393 | first_packet_empty = 1; | |
394 | ||
395 | } else if (first_packet_empty && (f->n_packets == 1) ) { | |
396 | /* if the first packet was empty, the second | |
397 | packet's CIP header also needs a timestamp */ | |
398 | f->cip_syt2 = cip; | |
399 | } | |
400 | ||
401 | fill_cip_header(cip, | |
402 | /* the node ID number of the OHCI card */ | |
403 | reg_read(video->ohci, OHCI1394_NodeID) & 0x3F, | |
404 | video->continuity_counter, | |
405 | video->pal_or_ntsc, | |
406 | 0xFFFF /* the timestamp is filled in later */); | |
407 | ||
408 | /* advance counter, only for full packets */ | |
409 | if ( ! empty_packet ) | |
410 | video->continuity_counter++; | |
411 | ||
412 | /******************************/ | |
413 | /* setup DMA descriptor block */ | |
414 | /******************************/ | |
415 | ||
416 | /* first descriptor - OUTPUT_MORE_IMMEDIATE, for the controller's IT header */ | |
417 | fill_output_more_immediate( &(block->u.out.omi), 1, video->channel, 0, payload_size); | |
418 | ||
419 | if (empty_packet) { | |
420 | /* second descriptor - OUTPUT_LAST for CIP header */ | |
421 | fill_output_last( &(block->u.out.u.empty.ol), | |
422 | ||
423 | /* want completion status on all interesting packets */ | |
424 | (first_packet || mid_packet || last_packet) ? 1 : 0, | |
425 | ||
426 | /* want interrupts on all interesting packets */ | |
427 | (first_packet || mid_packet || last_packet) ? 1 : 0, | |
428 | ||
429 | sizeof(struct CIP_header), /* data size */ | |
430 | cip_dma); | |
431 | ||
432 | if (first_packet) | |
433 | f->frame_begin_timestamp = &(block->u.out.u.empty.ol.q[3]); | |
434 | else if (mid_packet) | |
435 | f->mid_frame_timestamp = &(block->u.out.u.empty.ol.q[3]); | |
436 | else if (last_packet) { | |
437 | f->frame_end_timestamp = &(block->u.out.u.empty.ol.q[3]); | |
438 | f->frame_end_branch = &(block->u.out.u.empty.ol.q[2]); | |
439 | } | |
440 | ||
441 | branch_address = &(block->u.out.u.empty.ol.q[2]); | |
442 | n_descriptors = 3; | |
443 | if (first_packet) | |
444 | f->first_n_descriptors = n_descriptors; | |
445 | ||
446 | } else { /* full packet */ | |
447 | ||
448 | /* second descriptor - OUTPUT_MORE for CIP header */ | |
449 | fill_output_more( &(block->u.out.u.full.om), | |
450 | sizeof(struct CIP_header), /* data size */ | |
451 | cip_dma); | |
452 | ||
453 | ||
454 | /* third (and possibly fourth) descriptor - for DV data */ | |
455 | /* the 480-byte payload can cross a page boundary; if so, | |
456 | we need to split it into two DMA descriptors */ | |
457 | ||
458 | /* does the 480-byte data payload cross a page boundary? */ | |
459 | if ( (PAGE_SIZE- ((unsigned long)data_p % PAGE_SIZE) ) < 480 ) { | |
460 | ||
461 | /* page boundary crossed */ | |
462 | ||
463 | fill_output_more( &(block->u.out.u.full.u.cross.om), | |
464 | /* data size - how much of data_p fits on the first page */ | |
465 | PAGE_SIZE - (data_p % PAGE_SIZE), | |
466 | ||
467 | /* DMA address of data_p */ | |
468 | dma_region_offset_to_bus(&video->dv_buf, | |
469 | data_p - (unsigned long) video->dv_buf.kvirt)); | |
470 | ||
471 | fill_output_last( &(block->u.out.u.full.u.cross.ol), | |
472 | ||
473 | /* want completion status on all interesting packets */ | |
474 | (first_packet || mid_packet || last_packet) ? 1 : 0, | |
475 | ||
476 | /* want interrupt on all interesting packets */ | |
477 | (first_packet || mid_packet || last_packet) ? 1 : 0, | |
478 | ||
479 | /* data size - remaining portion of data_p */ | |
480 | 480 - (PAGE_SIZE - (data_p % PAGE_SIZE)), | |
481 | ||
482 | /* DMA address of data_p + PAGE_SIZE - (data_p % PAGE_SIZE) */ | |
483 | dma_region_offset_to_bus(&video->dv_buf, | |
484 | data_p + PAGE_SIZE - (data_p % PAGE_SIZE) - (unsigned long) video->dv_buf.kvirt)); | |
485 | ||
486 | if (first_packet) | |
487 | f->frame_begin_timestamp = &(block->u.out.u.full.u.cross.ol.q[3]); | |
488 | else if (mid_packet) | |
489 | f->mid_frame_timestamp = &(block->u.out.u.full.u.cross.ol.q[3]); | |
490 | else if (last_packet) { | |
491 | f->frame_end_timestamp = &(block->u.out.u.full.u.cross.ol.q[3]); | |
492 | f->frame_end_branch = &(block->u.out.u.full.u.cross.ol.q[2]); | |
493 | } | |
494 | ||
495 | branch_address = &(block->u.out.u.full.u.cross.ol.q[2]); | |
496 | ||
497 | n_descriptors = 5; | |
498 | if (first_packet) | |
499 | f->first_n_descriptors = n_descriptors; | |
500 | ||
501 | full_packets++; | |
502 | ||
503 | } else { | |
504 | /* fits on one page */ | |
505 | ||
506 | fill_output_last( &(block->u.out.u.full.u.nocross.ol), | |
507 | ||
508 | /* want completion status on all interesting packets */ | |
509 | (first_packet || mid_packet || last_packet) ? 1 : 0, | |
510 | ||
511 | /* want interrupt on all interesting packets */ | |
512 | (first_packet || mid_packet || last_packet) ? 1 : 0, | |
513 | ||
514 | 480, /* data size (480 bytes of DV data) */ | |
515 | ||
516 | ||
517 | /* DMA address of data_p */ | |
518 | dma_region_offset_to_bus(&video->dv_buf, | |
519 | data_p - (unsigned long) video->dv_buf.kvirt)); | |
520 | ||
521 | if (first_packet) | |
522 | f->frame_begin_timestamp = &(block->u.out.u.full.u.nocross.ol.q[3]); | |
523 | else if (mid_packet) | |
524 | f->mid_frame_timestamp = &(block->u.out.u.full.u.nocross.ol.q[3]); | |
525 | else if (last_packet) { | |
526 | f->frame_end_timestamp = &(block->u.out.u.full.u.nocross.ol.q[3]); | |
527 | f->frame_end_branch = &(block->u.out.u.full.u.nocross.ol.q[2]); | |
528 | } | |
529 | ||
530 | branch_address = &(block->u.out.u.full.u.nocross.ol.q[2]); | |
531 | ||
532 | n_descriptors = 4; | |
533 | if (first_packet) | |
534 | f->first_n_descriptors = n_descriptors; | |
535 | ||
536 | full_packets++; | |
537 | } | |
538 | } | |
539 | ||
540 | /* link this descriptor block into the DMA program by filling in | |
541 | the branch address of the previous block */ | |
542 | ||
543 | /* note: we are not linked into the active DMA chain yet */ | |
544 | ||
545 | if (last_branch_address) { | |
546 | *(last_branch_address) = cpu_to_le32(block_dma | n_descriptors); | |
547 | } | |
548 | ||
549 | last_branch_address = branch_address; | |
550 | ||
551 | ||
552 | f->n_packets++; | |
553 | ||
554 | } | |
555 | ||
556 | /* when we first assemble a new frame, set the final branch | |
557 | to loop back up to the top */ | |
558 | *(f->frame_end_branch) = cpu_to_le32(f->descriptor_pool_dma | f->first_n_descriptors); | |
559 | ||
560 | /* make the latest version of this frame visible to the PCI card */ | |
561 | dma_region_sync_for_device(&video->dv_buf, f->data - (unsigned long) video->dv_buf.kvirt, video->frame_size); | |
562 | ||
563 | /* lock against DMA interrupt */ | |
564 | spin_lock_irqsave(&video->spinlock, irq_flags); | |
565 | ||
566 | f->state = FRAME_READY; | |
567 | ||
568 | video->n_clear_frames--; | |
569 | ||
570 | last_frame = video->first_clear_frame - 1; | |
571 | if (last_frame == -1) | |
572 | last_frame = video->n_frames-1; | |
573 | ||
574 | video->first_clear_frame = (video->first_clear_frame + 1) % video->n_frames; | |
575 | ||
576 | irq_printk(" frame %d prepared, active_frame = %d, n_clear_frames = %d, first_clear_frame = %d\n last=%d\n", | |
577 | this_frame, video->active_frame, video->n_clear_frames, video->first_clear_frame, last_frame); | |
578 | ||
579 | irq_printk(" begin_ts %08lx mid_ts %08lx end_ts %08lx end_br %08lx\n", | |
580 | (unsigned long) f->frame_begin_timestamp, | |
581 | (unsigned long) f->mid_frame_timestamp, | |
582 | (unsigned long) f->frame_end_timestamp, | |
583 | (unsigned long) f->frame_end_branch); | |
584 | ||
585 | if (video->active_frame != -1) { | |
586 | ||
587 | /* if DMA is already active, we are almost done */ | |
588 | /* just link us onto the active DMA chain */ | |
589 | if (video->frames[last_frame]->frame_end_branch) { | |
590 | u32 temp; | |
591 | ||
592 | /* point the previous frame's tail to this frame's head */ | |
593 | *(video->frames[last_frame]->frame_end_branch) = cpu_to_le32(f->descriptor_pool_dma | f->first_n_descriptors); | |
594 | ||
595 | /* this write MUST precede the next one, or we could silently drop frames */ | |
596 | wmb(); | |
597 | ||
598 | /* disable the want_status semaphore on the last packet */ | |
599 | temp = le32_to_cpu(*(video->frames[last_frame]->frame_end_branch - 2)); | |
600 | temp &= 0xF7CFFFFF; | |
601 | *(video->frames[last_frame]->frame_end_branch - 2) = cpu_to_le32(temp); | |
602 | ||
603 | /* flush these writes to memory ASAP */ | |
604 | flush_pci_write(video->ohci); | |
605 | ||
606 | /* NOTE: | |
607 | ideally the writes should be "atomic": if | |
608 | the OHCI card reads the want_status flag in | |
609 | between them, we'll falsely report a | |
610 | dropped frame. Hopefully this window is too | |
611 | small to really matter, and the consequence | |
612 | is rather harmless. */ | |
613 | ||
614 | ||
615 | irq_printk(" new frame %d linked onto DMA chain\n", this_frame); | |
616 | ||
617 | } else { | |
618 | printk(KERN_ERR "dv1394: last frame not ready???\n"); | |
619 | } | |
620 | ||
621 | } else { | |
622 | ||
623 | u32 transmit_sec, transmit_cyc; | |
624 | u32 ts_cyc, ts_off; | |
625 | ||
626 | /* DMA is stopped, so this is the very first frame */ | |
627 | video->active_frame = this_frame; | |
628 | ||
629 | /* set CommandPtr to address and size of first descriptor block */ | |
630 | reg_write(video->ohci, video->ohci_IsoXmitCommandPtr, | |
631 | video->frames[video->active_frame]->descriptor_pool_dma | | |
632 | f->first_n_descriptors); | |
633 | ||
634 | /* assign a timestamp based on the current cycle time... | |
635 | We'll tell the card to begin DMA 100 cycles from now, | |
636 | and assign a timestamp 103 cycles from now */ | |
637 | ||
638 | cycleTimer = reg_read(video->ohci, OHCI1394_IsochronousCycleTimer); | |
639 | ||
640 | ct_sec = cycleTimer >> 25; | |
641 | ct_cyc = (cycleTimer >> 12) & 0x1FFF; | |
642 | ct_off = cycleTimer & 0xFFF; | |
643 | ||
644 | transmit_sec = ct_sec; | |
645 | transmit_cyc = ct_cyc + 100; | |
646 | ||
647 | transmit_sec += transmit_cyc/8000; | |
648 | transmit_cyc %= 8000; | |
649 | ||
650 | ts_off = ct_off; | |
651 | ts_cyc = transmit_cyc + 3; | |
652 | ts_cyc %= 8000; | |
653 | ||
654 | f->assigned_timestamp = (ts_cyc&0xF) << 12; | |
655 | ||
656 | /* now actually write the timestamp into the appropriate CIP headers */ | |
657 | if (f->cip_syt1) { | |
658 | f->cip_syt1->b[6] = f->assigned_timestamp >> 8; | |
659 | f->cip_syt1->b[7] = f->assigned_timestamp & 0xFF; | |
660 | } | |
661 | if (f->cip_syt2) { | |
662 | f->cip_syt2->b[6] = f->assigned_timestamp >> 8; | |
663 | f->cip_syt2->b[7] = f->assigned_timestamp & 0xFF; | |
664 | } | |
665 | ||
666 | /* --- start DMA --- */ | |
667 | ||
668 | /* clear all bits in ContextControl register */ | |
669 | ||
670 | reg_write(video->ohci, video->ohci_IsoXmitContextControlClear, 0xFFFFFFFF); | |
671 | wmb(); | |
672 | ||
673 | /* the OHCI card has the ability to start ISO transmission on a | |
674 | particular cycle (start-on-cycle). This way we can ensure that | |
675 | the first DV frame will have an accurate timestamp. | |
676 | ||
677 | However, start-on-cycle only appears to work if the OHCI card | |
678 | is cycle master! Since the consequences of messing up the first | |
679 | timestamp are minimal*, just disable start-on-cycle for now. | |
680 | ||
681 | * my DV deck drops the first few frames before it "locks in;" | |
682 | so the first frame having an incorrect timestamp is inconsequential. | |
683 | */ | |
684 | ||
685 | #if 0 | |
686 | reg_write(video->ohci, video->ohci_IsoXmitContextControlSet, | |
687 | (1 << 31) /* enable start-on-cycle */ | |
688 | | ( (transmit_sec & 0x3) << 29) | |
689 | | (transmit_cyc << 16)); | |
690 | wmb(); | |
691 | #endif | |
692 | ||
693 | video->dma_running = 1; | |
694 | ||
695 | /* set the 'run' bit */ | |
696 | reg_write(video->ohci, video->ohci_IsoXmitContextControlSet, 0x8000); | |
697 | flush_pci_write(video->ohci); | |
698 | ||
699 | /* --- DMA should be running now --- */ | |
700 | ||
701 | debug_printk(" Cycle = %4u ContextControl = %08x CmdPtr = %08x\n", | |
702 | (reg_read(video->ohci, OHCI1394_IsochronousCycleTimer) >> 12) & 0x1FFF, | |
703 | reg_read(video->ohci, video->ohci_IsoXmitContextControlSet), | |
704 | reg_read(video->ohci, video->ohci_IsoXmitCommandPtr)); | |
705 | ||
706 | debug_printk(" DMA start - current cycle %4u, transmit cycle %4u (%2u), assigning ts cycle %2u\n", | |
707 | ct_cyc, transmit_cyc, transmit_cyc & 0xF, ts_cyc & 0xF); | |
708 | ||
709 | #if DV1394_DEBUG_LEVEL >= 2 | |
710 | { | |
711 | /* check if DMA is really running */ | |
712 | int i = 0; | |
713 | while (i < 20) { | |
714 | mb(); | |
715 | mdelay(1); | |
716 | if (reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & (1 << 10)) { | |
717 | printk("DMA ACTIVE after %d msec\n", i); | |
718 | break; | |
719 | } | |
720 | i++; | |
721 | } | |
722 | ||
723 | printk("set = %08x, cmdPtr = %08x\n", | |
724 | reg_read(video->ohci, video->ohci_IsoXmitContextControlSet), | |
725 | reg_read(video->ohci, video->ohci_IsoXmitCommandPtr) | |
726 | ); | |
727 | ||
728 | if ( ! (reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & (1 << 10)) ) { | |
729 | printk("DMA did NOT go active after 20ms, event = %x\n", | |
730 | reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & 0x1F); | |
731 | } else | |
732 | printk("DMA is RUNNING!\n"); | |
733 | } | |
734 | #endif | |
735 | ||
736 | } | |
737 | ||
738 | ||
739 | spin_unlock_irqrestore(&video->spinlock, irq_flags); | |
740 | } | |
741 | ||
742 | ||
743 | ||
744 | /*** RECEIVE FUNCTIONS *****************************************************/ | |
745 | ||
746 | /* | |
747 | frame method put_packet | |
748 | ||
749 | map and copy the packet data to its location in the frame | |
750 | based upon DIF section and sequence | |
751 | */ | |
752 | ||
753 | static void inline | |
754 | frame_put_packet (struct frame *f, struct packet *p) | |
755 | { | |
756 | int section_type = p->data[0] >> 5; /* section type is in bits 5 - 7 */ | |
757 | int dif_sequence = p->data[1] >> 4; /* dif sequence number is in bits 4 - 7 */ | |
758 | int dif_block = p->data[2]; | |
759 | ||
760 | /* sanity check */ | |
761 | if (dif_sequence > 11 || dif_block > 149) return; | |
762 | ||
763 | switch (section_type) { | |
764 | case 0: /* 1 Header block */ | |
765 | memcpy( (void *) f->data + dif_sequence * 150 * 80, p->data, 480); | |
766 | break; | |
767 | ||
768 | case 1: /* 2 Subcode blocks */ | |
769 | memcpy( (void *) f->data + dif_sequence * 150 * 80 + (1 + dif_block) * 80, p->data, 480); | |
770 | break; | |
771 | ||
772 | case 2: /* 3 VAUX blocks */ | |
773 | memcpy( (void *) f->data + dif_sequence * 150 * 80 + (3 + dif_block) * 80, p->data, 480); | |
774 | break; | |
775 | ||
776 | case 3: /* 9 Audio blocks interleaved with video */ | |
777 | memcpy( (void *) f->data + dif_sequence * 150 * 80 + (6 + dif_block * 16) * 80, p->data, 480); | |
778 | break; | |
779 | ||
780 | case 4: /* 135 Video blocks interleaved with audio */ | |
781 | memcpy( (void *) f->data + dif_sequence * 150 * 80 + (7 + (dif_block / 15) + dif_block) * 80, p->data, 480); | |
782 | break; | |
783 | ||
784 | default: /* we can not handle any other data */ | |
785 | break; | |
786 | } | |
787 | } | |
788 | ||
789 | ||
790 | static void start_dma_receive(struct video_card *video) | |
791 | { | |
792 | if (video->first_run == 1) { | |
793 | video->first_run = 0; | |
794 | ||
795 | /* start DMA once all of the frames are READY */ | |
796 | video->n_clear_frames = 0; | |
797 | video->first_clear_frame = -1; | |
798 | video->current_packet = 0; | |
799 | video->active_frame = 0; | |
800 | ||
801 | /* reset iso recv control register */ | |
802 | reg_write(video->ohci, video->ohci_IsoRcvContextControlClear, 0xFFFFFFFF); | |
803 | wmb(); | |
804 | ||
805 | /* clear bufferFill, set isochHeader and speed (0=100) */ | |
806 | reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, 0x40000000); | |
807 | ||
808 | /* match on all tags, listen on channel */ | |
809 | reg_write(video->ohci, video->ohci_IsoRcvContextMatch, 0xf0000000 | video->channel); | |
810 | ||
811 | /* address and first descriptor block + Z=1 */ | |
812 | reg_write(video->ohci, video->ohci_IsoRcvCommandPtr, | |
813 | video->frames[0]->descriptor_pool_dma | 1); /* Z=1 */ | |
814 | wmb(); | |
815 | ||
816 | video->dma_running = 1; | |
817 | ||
818 | /* run */ | |
819 | reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, 0x8000); | |
820 | flush_pci_write(video->ohci); | |
821 | ||
822 | debug_printk("dv1394: DMA started\n"); | |
823 | ||
824 | #if DV1394_DEBUG_LEVEL >= 2 | |
825 | { | |
826 | int i; | |
827 | ||
828 | for (i = 0; i < 1000; ++i) { | |
829 | mdelay(1); | |
830 | if (reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & (1 << 10)) { | |
831 | printk("DMA ACTIVE after %d msec\n", i); | |
832 | break; | |
833 | } | |
834 | } | |
835 | if ( reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & (1 << 11) ) { | |
836 | printk("DEAD, event = %x\n", | |
837 | reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & 0x1F); | |
838 | } else | |
839 | printk("RUNNING!\n"); | |
840 | } | |
841 | #endif | |
842 | } else if ( reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & (1 << 11) ) { | |
843 | debug_printk("DEAD, event = %x\n", | |
844 | reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & 0x1F); | |
845 | ||
846 | /* wake */ | |
847 | reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 12)); | |
848 | } | |
849 | } | |
850 | ||
851 | ||
852 | /* | |
853 | receive_packets() - build the DMA program for receiving | |
854 | */ | |
855 | ||
856 | static void receive_packets(struct video_card *video) | |
857 | { | |
858 | struct DMA_descriptor_block *block = NULL; | |
859 | dma_addr_t block_dma = 0; | |
860 | struct packet *data = NULL; | |
861 | dma_addr_t data_dma = 0; | |
862 | u32 *last_branch_address = NULL; | |
863 | unsigned long irq_flags; | |
864 | int want_interrupt = 0; | |
865 | struct frame *f = NULL; | |
866 | int i, j; | |
867 | ||
868 | spin_lock_irqsave(&video->spinlock, irq_flags); | |
869 | ||
870 | for (j = 0; j < video->n_frames; j++) { | |
871 | ||
872 | /* connect frames */ | |
873 | if (j > 0 && f != NULL && f->frame_end_branch != NULL) | |
874 | *(f->frame_end_branch) = cpu_to_le32(video->frames[j]->descriptor_pool_dma | 1); /* set Z=1 */ | |
875 | ||
876 | f = video->frames[j]; | |
877 | ||
878 | for (i = 0; i < MAX_PACKETS; i++) { | |
879 | /* locate a descriptor block and packet from the buffer */ | |
880 | block = &(f->descriptor_pool[i]); | |
881 | block_dma = ((unsigned long) block - (unsigned long) f->descriptor_pool) + f->descriptor_pool_dma; | |
882 | ||
883 | data = ((struct packet*)video->packet_buf.kvirt) + f->frame_num * MAX_PACKETS + i; | |
884 | data_dma = dma_region_offset_to_bus( &video->packet_buf, | |
885 | ((unsigned long) data - (unsigned long) video->packet_buf.kvirt) ); | |
886 | ||
887 | /* setup DMA descriptor block */ | |
888 | want_interrupt = ((i % (MAX_PACKETS/2)) == 0 || i == (MAX_PACKETS-1)); | |
889 | fill_input_last( &(block->u.in.il), want_interrupt, 512, data_dma); | |
890 | ||
891 | /* link descriptors */ | |
892 | last_branch_address = f->frame_end_branch; | |
893 | ||
894 | if (last_branch_address != NULL) | |
895 | *(last_branch_address) = cpu_to_le32(block_dma | 1); /* set Z=1 */ | |
896 | ||
897 | f->frame_end_branch = &(block->u.in.il.q[2]); | |
898 | } | |
899 | ||
900 | } /* next j */ | |
901 | ||
902 | spin_unlock_irqrestore(&video->spinlock, irq_flags); | |
903 | ||
904 | } | |
905 | ||
906 | ||
907 | ||
908 | /*** MANAGEMENT FUNCTIONS **************************************************/ | |
909 | ||
910 | static int do_dv1394_init(struct video_card *video, struct dv1394_init *init) | |
911 | { | |
912 | unsigned long flags, new_buf_size; | |
913 | int i; | |
914 | u64 chan_mask; | |
915 | int retval = -EINVAL; | |
916 | ||
917 | debug_printk("dv1394: initialising %d\n", video->id); | |
918 | if (init->api_version != DV1394_API_VERSION) | |
919 | return -EINVAL; | |
920 | ||
921 | /* first sanitize all the parameters */ | |
922 | if ( (init->n_frames < 2) || (init->n_frames > DV1394_MAX_FRAMES) ) | |
923 | return -EINVAL; | |
924 | ||
925 | if ( (init->format != DV1394_NTSC) && (init->format != DV1394_PAL) ) | |
926 | return -EINVAL; | |
927 | ||
928 | if ( (init->syt_offset == 0) || (init->syt_offset > 50) ) | |
929 | /* default SYT offset is 3 cycles */ | |
930 | init->syt_offset = 3; | |
931 | ||
932 | if ( (init->channel > 63) || (init->channel < 0) ) | |
933 | init->channel = 63; | |
934 | ||
935 | chan_mask = (u64)1 << init->channel; | |
936 | ||
937 | /* calculate what size DMA buffer is needed */ | |
938 | if (init->format == DV1394_NTSC) | |
939 | new_buf_size = DV1394_NTSC_FRAME_SIZE * init->n_frames; | |
940 | else | |
941 | new_buf_size = DV1394_PAL_FRAME_SIZE * init->n_frames; | |
942 | ||
943 | /* round up to PAGE_SIZE */ | |
944 | if (new_buf_size % PAGE_SIZE) new_buf_size += PAGE_SIZE - (new_buf_size % PAGE_SIZE); | |
945 | ||
946 | /* don't allow the user to allocate the DMA buffer more than once */ | |
947 | if (video->dv_buf.kvirt && video->dv_buf_size != new_buf_size) { | |
948 | printk("dv1394: re-sizing the DMA buffer is not allowed\n"); | |
949 | return -EINVAL; | |
950 | } | |
951 | ||
952 | /* shutdown the card if it's currently active */ | |
953 | /* (the card should not be reset if the parameters are screwy) */ | |
954 | ||
955 | do_dv1394_shutdown(video, 0); | |
956 | ||
957 | /* try to claim the ISO channel */ | |
958 | spin_lock_irqsave(&video->ohci->IR_channel_lock, flags); | |
959 | if (video->ohci->ISO_channel_usage & chan_mask) { | |
960 | spin_unlock_irqrestore(&video->ohci->IR_channel_lock, flags); | |
961 | retval = -EBUSY; | |
962 | goto err; | |
963 | } | |
964 | video->ohci->ISO_channel_usage |= chan_mask; | |
965 | spin_unlock_irqrestore(&video->ohci->IR_channel_lock, flags); | |
966 | ||
967 | video->channel = init->channel; | |
968 | ||
969 | /* initialize misc. fields of video */ | |
970 | video->n_frames = init->n_frames; | |
971 | video->pal_or_ntsc = init->format; | |
972 | ||
973 | video->cip_accum = 0; | |
974 | video->continuity_counter = 0; | |
975 | ||
976 | video->active_frame = -1; | |
977 | video->first_clear_frame = 0; | |
978 | video->n_clear_frames = video->n_frames; | |
979 | video->dropped_frames = 0; | |
980 | ||
981 | video->write_off = 0; | |
982 | ||
983 | video->first_run = 1; | |
984 | video->current_packet = -1; | |
985 | video->first_frame = 0; | |
986 | ||
987 | if (video->pal_or_ntsc == DV1394_NTSC) { | |
988 | video->cip_n = init->cip_n != 0 ? init->cip_n : CIP_N_NTSC; | |
989 | video->cip_d = init->cip_d != 0 ? init->cip_d : CIP_D_NTSC; | |
990 | video->frame_size = DV1394_NTSC_FRAME_SIZE; | |
991 | } else { | |
992 | video->cip_n = init->cip_n != 0 ? init->cip_n : CIP_N_PAL; | |
993 | video->cip_d = init->cip_d != 0 ? init->cip_d : CIP_D_PAL; | |
994 | video->frame_size = DV1394_PAL_FRAME_SIZE; | |
995 | } | |
996 | ||
997 | video->syt_offset = init->syt_offset; | |
998 | ||
999 | /* find and claim DMA contexts on the OHCI card */ | |
1000 | ||
1001 | if (video->ohci_it_ctx == -1) { | |
1002 | ohci1394_init_iso_tasklet(&video->it_tasklet, OHCI_ISO_TRANSMIT, | |
1003 | it_tasklet_func, (unsigned long) video); | |
1004 | ||
1005 | if (ohci1394_register_iso_tasklet(video->ohci, &video->it_tasklet) < 0) { | |
1006 | printk(KERN_ERR "dv1394: could not find an available IT DMA context\n"); | |
1007 | retval = -EBUSY; | |
1008 | goto err; | |
1009 | } | |
1010 | ||
1011 | video->ohci_it_ctx = video->it_tasklet.context; | |
1012 | debug_printk("dv1394: claimed IT DMA context %d\n", video->ohci_it_ctx); | |
1013 | } | |
1014 | ||
1015 | if (video->ohci_ir_ctx == -1) { | |
1016 | ohci1394_init_iso_tasklet(&video->ir_tasklet, OHCI_ISO_RECEIVE, | |
1017 | ir_tasklet_func, (unsigned long) video); | |
1018 | ||
1019 | if (ohci1394_register_iso_tasklet(video->ohci, &video->ir_tasklet) < 0) { | |
1020 | printk(KERN_ERR "dv1394: could not find an available IR DMA context\n"); | |
1021 | retval = -EBUSY; | |
1022 | goto err; | |
1023 | } | |
1024 | video->ohci_ir_ctx = video->ir_tasklet.context; | |
1025 | debug_printk("dv1394: claimed IR DMA context %d\n", video->ohci_ir_ctx); | |
1026 | } | |
1027 | ||
1028 | /* allocate struct frames */ | |
1029 | for (i = 0; i < init->n_frames; i++) { | |
1030 | video->frames[i] = frame_new(i, video); | |
1031 | ||
1032 | if (!video->frames[i]) { | |
1033 | printk(KERN_ERR "dv1394: Cannot allocate frame structs\n"); | |
1034 | retval = -ENOMEM; | |
1035 | goto err; | |
1036 | } | |
1037 | } | |
1038 | ||
1039 | if (!video->dv_buf.kvirt) { | |
1040 | /* allocate the ringbuffer */ | |
1041 | retval = dma_region_alloc(&video->dv_buf, new_buf_size, video->ohci->dev, PCI_DMA_TODEVICE); | |
1042 | if (retval) | |
1043 | goto err; | |
1044 | ||
1045 | video->dv_buf_size = new_buf_size; | |
1046 | ||
1047 | debug_printk("dv1394: Allocated %d frame buffers, total %u pages (%u DMA pages), %lu bytes\n", | |
1048 | video->n_frames, video->dv_buf.n_pages, | |
1049 | video->dv_buf.n_dma_pages, video->dv_buf_size); | |
1050 | } | |
1051 | ||
1052 | /* set up the frame->data pointers */ | |
1053 | for (i = 0; i < video->n_frames; i++) | |
1054 | video->frames[i]->data = (unsigned long) video->dv_buf.kvirt + i * video->frame_size; | |
1055 | ||
1056 | if (!video->packet_buf.kvirt) { | |
1057 | /* allocate packet buffer */ | |
1058 | video->packet_buf_size = sizeof(struct packet) * video->n_frames * MAX_PACKETS; | |
1059 | if (video->packet_buf_size % PAGE_SIZE) | |
1060 | video->packet_buf_size += PAGE_SIZE - (video->packet_buf_size % PAGE_SIZE); | |
1061 | ||
1062 | retval = dma_region_alloc(&video->packet_buf, video->packet_buf_size, | |
1063 | video->ohci->dev, PCI_DMA_FROMDEVICE); | |
1064 | if (retval) | |
1065 | goto err; | |
1066 | ||
1067 | debug_printk("dv1394: Allocated %d packets in buffer, total %u pages (%u DMA pages), %lu bytes\n", | |
1068 | video->n_frames*MAX_PACKETS, video->packet_buf.n_pages, | |
1069 | video->packet_buf.n_dma_pages, video->packet_buf_size); | |
1070 | } | |
1071 | ||
1072 | /* set up register offsets for IT context */ | |
1073 | /* IT DMA context registers are spaced 16 bytes apart */ | |
1074 | video->ohci_IsoXmitContextControlSet = OHCI1394_IsoXmitContextControlSet+16*video->ohci_it_ctx; | |
1075 | video->ohci_IsoXmitContextControlClear = OHCI1394_IsoXmitContextControlClear+16*video->ohci_it_ctx; | |
1076 | video->ohci_IsoXmitCommandPtr = OHCI1394_IsoXmitCommandPtr+16*video->ohci_it_ctx; | |
1077 | ||
1078 | /* enable interrupts for IT context */ | |
1079 | reg_write(video->ohci, OHCI1394_IsoXmitIntMaskSet, (1 << video->ohci_it_ctx)); | |
1080 | debug_printk("dv1394: interrupts enabled for IT context %d\n", video->ohci_it_ctx); | |
1081 | ||
1082 | /* set up register offsets for IR context */ | |
1083 | /* IR DMA context registers are spaced 32 bytes apart */ | |
1084 | video->ohci_IsoRcvContextControlSet = OHCI1394_IsoRcvContextControlSet+32*video->ohci_ir_ctx; | |
1085 | video->ohci_IsoRcvContextControlClear = OHCI1394_IsoRcvContextControlClear+32*video->ohci_ir_ctx; | |
1086 | video->ohci_IsoRcvCommandPtr = OHCI1394_IsoRcvCommandPtr+32*video->ohci_ir_ctx; | |
1087 | video->ohci_IsoRcvContextMatch = OHCI1394_IsoRcvContextMatch+32*video->ohci_ir_ctx; | |
1088 | ||
1089 | /* enable interrupts for IR context */ | |
1090 | reg_write(video->ohci, OHCI1394_IsoRecvIntMaskSet, (1 << video->ohci_ir_ctx) ); | |
1091 | debug_printk("dv1394: interrupts enabled for IR context %d\n", video->ohci_ir_ctx); | |
1092 | ||
1093 | return 0; | |
1094 | ||
1095 | err: | |
1096 | do_dv1394_shutdown(video, 1); | |
1097 | return retval; | |
1098 | } | |
1099 | ||
1100 | /* if the user doesn't bother to call ioctl(INIT) before starting | |
1101 | mmap() or read()/write(), just give him some default values */ | |
1102 | ||
1103 | static int do_dv1394_init_default(struct video_card *video) | |
1104 | { | |
1105 | struct dv1394_init init; | |
1106 | ||
1107 | init.api_version = DV1394_API_VERSION; | |
1108 | init.n_frames = DV1394_MAX_FRAMES / 4; | |
1109 | /* the following are now set via devfs */ | |
1110 | init.channel = video->channel; | |
1111 | init.format = video->pal_or_ntsc; | |
1112 | init.cip_n = video->cip_n; | |
1113 | init.cip_d = video->cip_d; | |
1114 | init.syt_offset = video->syt_offset; | |
1115 | ||
1116 | return do_dv1394_init(video, &init); | |
1117 | } | |
1118 | ||
1119 | /* do NOT call from interrupt context */ | |
1120 | static void stop_dma(struct video_card *video) | |
1121 | { | |
1122 | unsigned long flags; | |
1123 | int i; | |
1124 | ||
1125 | /* no interrupts */ | |
1126 | spin_lock_irqsave(&video->spinlock, flags); | |
1127 | ||
1128 | video->dma_running = 0; | |
1129 | ||
1130 | if ( (video->ohci_it_ctx == -1) && (video->ohci_ir_ctx == -1) ) | |
1131 | goto out; | |
1132 | ||
1133 | /* stop DMA if in progress */ | |
1134 | if ( (video->active_frame != -1) || | |
1135 | (reg_read(video->ohci, video->ohci_IsoXmitContextControlClear) & (1 << 10)) || | |
1136 | (reg_read(video->ohci, video->ohci_IsoRcvContextControlClear) & (1 << 10)) ) { | |
1137 | ||
1138 | /* clear the .run bits */ | |
1139 | reg_write(video->ohci, video->ohci_IsoXmitContextControlClear, (1 << 15)); | |
1140 | reg_write(video->ohci, video->ohci_IsoRcvContextControlClear, (1 << 15)); | |
1141 | flush_pci_write(video->ohci); | |
1142 | ||
1143 | video->active_frame = -1; | |
1144 | video->first_run = 1; | |
1145 | ||
1146 | /* wait until DMA really stops */ | |
1147 | i = 0; | |
1148 | while (i < 1000) { | |
1149 | ||
1150 | /* wait 0.1 millisecond */ | |
1151 | udelay(100); | |
1152 | ||
1153 | if ( (reg_read(video->ohci, video->ohci_IsoXmitContextControlClear) & (1 << 10)) || | |
1154 | (reg_read(video->ohci, video->ohci_IsoRcvContextControlClear) & (1 << 10)) ) { | |
1155 | /* still active */ | |
1156 | debug_printk("dv1394: stop_dma: DMA not stopped yet\n" ); | |
1157 | mb(); | |
1158 | } else { | |
1159 | debug_printk("dv1394: stop_dma: DMA stopped safely after %d ms\n", i/10); | |
1160 | break; | |
1161 | } | |
1162 | ||
1163 | i++; | |
1164 | } | |
1165 | ||
1166 | if (i == 1000) { | |
1167 | printk(KERN_ERR "dv1394: stop_dma: DMA still going after %d ms!\n", i/10); | |
1168 | } | |
1169 | } | |
1170 | else | |
1171 | debug_printk("dv1394: stop_dma: already stopped.\n"); | |
1172 | ||
1173 | out: | |
1174 | spin_unlock_irqrestore(&video->spinlock, flags); | |
1175 | } | |
1176 | ||
1177 | ||
1178 | ||
1179 | static void do_dv1394_shutdown(struct video_card *video, int free_dv_buf) | |
1180 | { | |
1181 | int i; | |
1182 | ||
1183 | debug_printk("dv1394: shutdown...\n"); | |
1184 | ||
1185 | /* stop DMA if in progress */ | |
1186 | stop_dma(video); | |
1187 | ||
1188 | /* release the DMA contexts */ | |
1189 | if (video->ohci_it_ctx != -1) { | |
1190 | video->ohci_IsoXmitContextControlSet = 0; | |
1191 | video->ohci_IsoXmitContextControlClear = 0; | |
1192 | video->ohci_IsoXmitCommandPtr = 0; | |
1193 | ||
1194 | /* disable interrupts for IT context */ | |
1195 | reg_write(video->ohci, OHCI1394_IsoXmitIntMaskClear, (1 << video->ohci_it_ctx)); | |
1196 | ||
1197 | /* remove tasklet */ | |
1198 | ohci1394_unregister_iso_tasklet(video->ohci, &video->it_tasklet); | |
1199 | debug_printk("dv1394: IT context %d released\n", video->ohci_it_ctx); | |
1200 | video->ohci_it_ctx = -1; | |
1201 | } | |
1202 | ||
1203 | if (video->ohci_ir_ctx != -1) { | |
1204 | video->ohci_IsoRcvContextControlSet = 0; | |
1205 | video->ohci_IsoRcvContextControlClear = 0; | |
1206 | video->ohci_IsoRcvCommandPtr = 0; | |
1207 | video->ohci_IsoRcvContextMatch = 0; | |
1208 | ||
1209 | /* disable interrupts for IR context */ | |
1210 | reg_write(video->ohci, OHCI1394_IsoRecvIntMaskClear, (1 << video->ohci_ir_ctx)); | |
1211 | ||
1212 | /* remove tasklet */ | |
1213 | ohci1394_unregister_iso_tasklet(video->ohci, &video->ir_tasklet); | |
1214 | debug_printk("dv1394: IR context %d released\n", video->ohci_ir_ctx); | |
1215 | video->ohci_ir_ctx = -1; | |
1216 | } | |
1217 | ||
1218 | /* release the ISO channel */ | |
1219 | if (video->channel != -1) { | |
1220 | u64 chan_mask; | |
1221 | unsigned long flags; | |
1222 | ||
1223 | chan_mask = (u64)1 << video->channel; | |
1224 | ||
1225 | spin_lock_irqsave(&video->ohci->IR_channel_lock, flags); | |
1226 | video->ohci->ISO_channel_usage &= ~(chan_mask); | |
1227 | spin_unlock_irqrestore(&video->ohci->IR_channel_lock, flags); | |
1228 | ||
1229 | video->channel = -1; | |
1230 | } | |
1231 | ||
1232 | /* free the frame structs */ | |
1233 | for (i = 0; i < DV1394_MAX_FRAMES; i++) { | |
1234 | if (video->frames[i]) | |
1235 | frame_delete(video->frames[i]); | |
1236 | video->frames[i] = NULL; | |
1237 | } | |
1238 | ||
1239 | video->n_frames = 0; | |
1240 | ||
1241 | /* we can't free the DMA buffer unless it is guaranteed that | |
1242 | no more user-space mappings exist */ | |
1243 | ||
1244 | if (free_dv_buf) { | |
1245 | dma_region_free(&video->dv_buf); | |
1246 | video->dv_buf_size = 0; | |
1247 | } | |
1248 | ||
1249 | /* free packet buffer */ | |
1250 | dma_region_free(&video->packet_buf); | |
1251 | video->packet_buf_size = 0; | |
1252 | ||
1253 | debug_printk("dv1394: shutdown OK\n"); | |
1254 | } | |
1255 | ||
1256 | /* | |
1257 | ********************************** | |
1258 | *** MMAP() THEORY OF OPERATION *** | |
1259 | ********************************** | |
1260 | ||
1261 | The ringbuffer cannot be re-allocated or freed while | |
1262 | a user program maintains a mapping of it. (note that a mapping | |
1263 | can persist even after the device fd is closed!) | |
1264 | ||
1265 | So, only let the user process allocate the DMA buffer once. | |
1266 | To resize or deallocate it, you must close the device file | |
1267 | and open it again. | |
1268 | ||
1269 | Previously Dan M. hacked out a scheme that allowed the DMA | |
1270 | buffer to change by forcefully unmapping it from the user's | |
1271 | address space. It was prone to error because it's very hard to | |
1272 | track all the places the buffer could have been mapped (we | |
1273 | would have had to walk the vma list of every process in the | |
1274 | system to be sure we found all the mappings!). Instead, we | |
1275 | force the user to choose one buffer size and stick with | |
1276 | it. This small sacrifice is worth the huge reduction in | |
1277 | error-prone code in dv1394. | |
1278 | */ | |
1279 | ||
1280 | static int dv1394_mmap(struct file *file, struct vm_area_struct *vma) | |
1281 | { | |
1282 | struct video_card *video = file_to_video_card(file); | |
1283 | int retval = -EINVAL; | |
1284 | ||
1285 | /* serialize mmap */ | |
1286 | down(&video->sem); | |
1287 | ||
1288 | if ( ! video_card_initialized(video) ) { | |
1289 | retval = do_dv1394_init_default(video); | |
1290 | if (retval) | |
1291 | goto out; | |
1292 | } | |
1293 | ||
1294 | retval = dma_region_mmap(&video->dv_buf, file, vma); | |
1295 | out: | |
1296 | up(&video->sem); | |
1297 | return retval; | |
1298 | } | |
1299 | ||
1300 | /*** DEVICE FILE INTERFACE *************************************************/ | |
1301 | ||
1302 | /* no need to serialize, multiple threads OK */ | |
1303 | static unsigned int dv1394_poll(struct file *file, struct poll_table_struct *wait) | |
1304 | { | |
1305 | struct video_card *video = file_to_video_card(file); | |
1306 | unsigned int mask = 0; | |
1307 | unsigned long flags; | |
1308 | ||
1309 | poll_wait(file, &video->waitq, wait); | |
1310 | ||
1311 | spin_lock_irqsave(&video->spinlock, flags); | |
1312 | if ( video->n_frames == 0 ) { | |
1313 | ||
1314 | } else if ( video->active_frame == -1 ) { | |
1315 | /* nothing going on */ | |
1316 | mask |= POLLOUT; | |
1317 | } else { | |
1318 | /* any clear/ready buffers? */ | |
1319 | if (video->n_clear_frames >0) | |
1320 | mask |= POLLOUT | POLLIN; | |
1321 | } | |
1322 | spin_unlock_irqrestore(&video->spinlock, flags); | |
1323 | ||
1324 | return mask; | |
1325 | } | |
1326 | ||
1327 | static int dv1394_fasync(int fd, struct file *file, int on) | |
1328 | { | |
1329 | /* I just copied this code verbatim from Alan Cox's mouse driver example | |
1330 | (Documentation/DocBook/) */ | |
1331 | ||
1332 | struct video_card *video = file_to_video_card(file); | |
1333 | ||
1334 | int retval = fasync_helper(fd, file, on, &video->fasync); | |
1335 | ||
1336 | if (retval < 0) | |
1337 | return retval; | |
1338 | return 0; | |
1339 | } | |
1340 | ||
1341 | static ssize_t dv1394_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) | |
1342 | { | |
1343 | struct video_card *video = file_to_video_card(file); | |
1344 | DECLARE_WAITQUEUE(wait, current); | |
1345 | ssize_t ret; | |
1346 | size_t cnt; | |
1347 | unsigned long flags; | |
1348 | int target_frame; | |
1349 | ||
1350 | /* serialize this to prevent multi-threaded mayhem */ | |
1351 | if (file->f_flags & O_NONBLOCK) { | |
1352 | if (down_trylock(&video->sem)) | |
1353 | return -EAGAIN; | |
1354 | } else { | |
1355 | if (down_interruptible(&video->sem)) | |
1356 | return -ERESTARTSYS; | |
1357 | } | |
1358 | ||
1359 | if ( !video_card_initialized(video) ) { | |
1360 | ret = do_dv1394_init_default(video); | |
1361 | if (ret) { | |
1362 | up(&video->sem); | |
1363 | return ret; | |
1364 | } | |
1365 | } | |
1366 | ||
1367 | ret = 0; | |
1368 | add_wait_queue(&video->waitq, &wait); | |
1369 | ||
1370 | while (count > 0) { | |
1371 | ||
1372 | /* must set TASK_INTERRUPTIBLE *before* checking for free | |
1373 | buffers; otherwise we could miss a wakeup if the interrupt | |
1374 | fires between the check and the schedule() */ | |
1375 | ||
1376 | set_current_state(TASK_INTERRUPTIBLE); | |
1377 | ||
1378 | spin_lock_irqsave(&video->spinlock, flags); | |
1379 | ||
1380 | target_frame = video->first_clear_frame; | |
1381 | ||
1382 | spin_unlock_irqrestore(&video->spinlock, flags); | |
1383 | ||
1384 | if (video->frames[target_frame]->state == FRAME_CLEAR) { | |
1385 | ||
1386 | /* how much room is left in the target frame buffer */ | |
1387 | cnt = video->frame_size - (video->write_off - target_frame * video->frame_size); | |
1388 | ||
1389 | } else { | |
1390 | /* buffer is already used */ | |
1391 | cnt = 0; | |
1392 | } | |
1393 | ||
1394 | if (cnt > count) | |
1395 | cnt = count; | |
1396 | ||
1397 | if (cnt <= 0) { | |
1398 | /* no room left, gotta wait */ | |
1399 | if (file->f_flags & O_NONBLOCK) { | |
1400 | if (!ret) | |
1401 | ret = -EAGAIN; | |
1402 | break; | |
1403 | } | |
1404 | if (signal_pending(current)) { | |
1405 | if (!ret) | |
1406 | ret = -ERESTARTSYS; | |
1407 | break; | |
1408 | } | |
1409 | ||
1410 | schedule(); | |
1411 | ||
1412 | continue; /* start over from 'while(count > 0)...' */ | |
1413 | } | |
1414 | ||
1415 | if (copy_from_user(video->dv_buf.kvirt + video->write_off, buffer, cnt)) { | |
1416 | if (!ret) | |
1417 | ret = -EFAULT; | |
1418 | break; | |
1419 | } | |
1420 | ||
1421 | video->write_off = (video->write_off + cnt) % (video->n_frames * video->frame_size); | |
1422 | ||
1423 | count -= cnt; | |
1424 | buffer += cnt; | |
1425 | ret += cnt; | |
1426 | ||
1427 | if (video->write_off == video->frame_size * ((target_frame + 1) % video->n_frames)) | |
1428 | frame_prepare(video, target_frame); | |
1429 | } | |
1430 | ||
1431 | remove_wait_queue(&video->waitq, &wait); | |
1432 | set_current_state(TASK_RUNNING); | |
1433 | up(&video->sem); | |
1434 | return ret; | |
1435 | } | |
1436 | ||
1437 | ||
1438 | static ssize_t dv1394_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
1439 | { | |
1440 | struct video_card *video = file_to_video_card(file); | |
1441 | DECLARE_WAITQUEUE(wait, current); | |
1442 | ssize_t ret; | |
1443 | size_t cnt; | |
1444 | unsigned long flags; | |
1445 | int target_frame; | |
1446 | ||
1447 | /* serialize this to prevent multi-threaded mayhem */ | |
1448 | if (file->f_flags & O_NONBLOCK) { | |
1449 | if (down_trylock(&video->sem)) | |
1450 | return -EAGAIN; | |
1451 | } else { | |
1452 | if (down_interruptible(&video->sem)) | |
1453 | return -ERESTARTSYS; | |
1454 | } | |
1455 | ||
1456 | if ( !video_card_initialized(video) ) { | |
1457 | ret = do_dv1394_init_default(video); | |
1458 | if (ret) { | |
1459 | up(&video->sem); | |
1460 | return ret; | |
1461 | } | |
1462 | video->continuity_counter = -1; | |
1463 | ||
1464 | receive_packets(video); | |
1465 | ||
1466 | start_dma_receive(video); | |
1467 | } | |
1468 | ||
1469 | ret = 0; | |
1470 | add_wait_queue(&video->waitq, &wait); | |
1471 | ||
1472 | while (count > 0) { | |
1473 | ||
1474 | /* must set TASK_INTERRUPTIBLE *before* checking for free | |
1475 | buffers; otherwise we could miss a wakeup if the interrupt | |
1476 | fires between the check and the schedule() */ | |
1477 | ||
1478 | set_current_state(TASK_INTERRUPTIBLE); | |
1479 | ||
1480 | spin_lock_irqsave(&video->spinlock, flags); | |
1481 | ||
1482 | target_frame = video->first_clear_frame; | |
1483 | ||
1484 | spin_unlock_irqrestore(&video->spinlock, flags); | |
1485 | ||
1486 | if (target_frame >= 0 && | |
1487 | video->n_clear_frames > 0 && | |
1488 | video->frames[target_frame]->state == FRAME_CLEAR) { | |
1489 | ||
1490 | /* how much room is left in the target frame buffer */ | |
1491 | cnt = video->frame_size - (video->write_off - target_frame * video->frame_size); | |
1492 | ||
1493 | } else { | |
1494 | /* buffer is already used */ | |
1495 | cnt = 0; | |
1496 | } | |
1497 | ||
1498 | if (cnt > count) | |
1499 | cnt = count; | |
1500 | ||
1501 | if (cnt <= 0) { | |
1502 | /* no room left, gotta wait */ | |
1503 | if (file->f_flags & O_NONBLOCK) { | |
1504 | if (!ret) | |
1505 | ret = -EAGAIN; | |
1506 | break; | |
1507 | } | |
1508 | if (signal_pending(current)) { | |
1509 | if (!ret) | |
1510 | ret = -ERESTARTSYS; | |
1511 | break; | |
1512 | } | |
1513 | ||
1514 | schedule(); | |
1515 | ||
1516 | continue; /* start over from 'while(count > 0)...' */ | |
1517 | } | |
1518 | ||
1519 | if (copy_to_user(buffer, video->dv_buf.kvirt + video->write_off, cnt)) { | |
1520 | if (!ret) | |
1521 | ret = -EFAULT; | |
1522 | break; | |
1523 | } | |
1524 | ||
1525 | video->write_off = (video->write_off + cnt) % (video->n_frames * video->frame_size); | |
1526 | ||
1527 | count -= cnt; | |
1528 | buffer += cnt; | |
1529 | ret += cnt; | |
1530 | ||
1531 | if (video->write_off == video->frame_size * ((target_frame + 1) % video->n_frames)) { | |
1532 | spin_lock_irqsave(&video->spinlock, flags); | |
1533 | video->n_clear_frames--; | |
1534 | video->first_clear_frame = (video->first_clear_frame + 1) % video->n_frames; | |
1535 | spin_unlock_irqrestore(&video->spinlock, flags); | |
1536 | } | |
1537 | } | |
1538 | ||
1539 | remove_wait_queue(&video->waitq, &wait); | |
1540 | set_current_state(TASK_RUNNING); | |
1541 | up(&video->sem); | |
1542 | return ret; | |
1543 | } | |
1544 | ||
1545 | ||
1546 | /*** DEVICE IOCTL INTERFACE ************************************************/ | |
1547 | ||
1548 | static long dv1394_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
1549 | { | |
1550 | struct video_card *video; | |
1551 | unsigned long flags; | |
1552 | int ret = -EINVAL; | |
1553 | void __user *argp = (void __user *)arg; | |
1554 | ||
1555 | DECLARE_WAITQUEUE(wait, current); | |
1556 | ||
1557 | lock_kernel(); | |
1558 | video = file_to_video_card(file); | |
1559 | ||
1560 | /* serialize this to prevent multi-threaded mayhem */ | |
1561 | if (file->f_flags & O_NONBLOCK) { | |
1562 | if (down_trylock(&video->sem)) { | |
1563 | unlock_kernel(); | |
1564 | return -EAGAIN; | |
1565 | } | |
1566 | } else { | |
1567 | if (down_interruptible(&video->sem)) { | |
1568 | unlock_kernel(); | |
1569 | return -ERESTARTSYS; | |
1570 | } | |
1571 | } | |
1572 | ||
1573 | switch(cmd) | |
1574 | { | |
1575 | case DV1394_IOC_SUBMIT_FRAMES: { | |
1576 | unsigned int n_submit; | |
1577 | ||
1578 | if ( !video_card_initialized(video) ) { | |
1579 | ret = do_dv1394_init_default(video); | |
1580 | if (ret) | |
1581 | goto out; | |
1582 | } | |
1583 | ||
1584 | n_submit = (unsigned int) arg; | |
1585 | ||
1586 | if (n_submit > video->n_frames) { | |
1587 | ret = -EINVAL; | |
1588 | goto out; | |
1589 | } | |
1590 | ||
1591 | while (n_submit > 0) { | |
1592 | ||
1593 | add_wait_queue(&video->waitq, &wait); | |
1594 | set_current_state(TASK_INTERRUPTIBLE); | |
1595 | ||
1596 | spin_lock_irqsave(&video->spinlock, flags); | |
1597 | ||
1598 | /* wait until video->first_clear_frame is really CLEAR */ | |
1599 | while (video->frames[video->first_clear_frame]->state != FRAME_CLEAR) { | |
1600 | ||
1601 | spin_unlock_irqrestore(&video->spinlock, flags); | |
1602 | ||
1603 | if (signal_pending(current)) { | |
1604 | remove_wait_queue(&video->waitq, &wait); | |
1605 | set_current_state(TASK_RUNNING); | |
1606 | ret = -EINTR; | |
1607 | goto out; | |
1608 | } | |
1609 | ||
1610 | schedule(); | |
1611 | set_current_state(TASK_INTERRUPTIBLE); | |
1612 | ||
1613 | spin_lock_irqsave(&video->spinlock, flags); | |
1614 | } | |
1615 | spin_unlock_irqrestore(&video->spinlock, flags); | |
1616 | ||
1617 | remove_wait_queue(&video->waitq, &wait); | |
1618 | set_current_state(TASK_RUNNING); | |
1619 | ||
1620 | frame_prepare(video, video->first_clear_frame); | |
1621 | ||
1622 | n_submit--; | |
1623 | } | |
1624 | ||
1625 | ret = 0; | |
1626 | break; | |
1627 | } | |
1628 | ||
1629 | case DV1394_IOC_WAIT_FRAMES: { | |
1630 | unsigned int n_wait; | |
1631 | ||
1632 | if ( !video_card_initialized(video) ) { | |
1633 | ret = -EINVAL; | |
1634 | goto out; | |
1635 | } | |
1636 | ||
1637 | n_wait = (unsigned int) arg; | |
1638 | ||
1639 | /* since we re-run the last frame on underflow, we will | |
1640 | never actually have n_frames clear frames; at most only | |
1641 | n_frames - 1 */ | |
1642 | ||
1643 | if (n_wait > (video->n_frames-1) ) { | |
1644 | ret = -EINVAL; | |
1645 | goto out; | |
1646 | } | |
1647 | ||
1648 | add_wait_queue(&video->waitq, &wait); | |
1649 | set_current_state(TASK_INTERRUPTIBLE); | |
1650 | ||
1651 | spin_lock_irqsave(&video->spinlock, flags); | |
1652 | ||
1653 | while (video->n_clear_frames < n_wait) { | |
1654 | ||
1655 | spin_unlock_irqrestore(&video->spinlock, flags); | |
1656 | ||
1657 | if (signal_pending(current)) { | |
1658 | remove_wait_queue(&video->waitq, &wait); | |
1659 | set_current_state(TASK_RUNNING); | |
1660 | ret = -EINTR; | |
1661 | goto out; | |
1662 | } | |
1663 | ||
1664 | schedule(); | |
1665 | set_current_state(TASK_INTERRUPTIBLE); | |
1666 | ||
1667 | spin_lock_irqsave(&video->spinlock, flags); | |
1668 | } | |
1669 | ||
1670 | spin_unlock_irqrestore(&video->spinlock, flags); | |
1671 | ||
1672 | remove_wait_queue(&video->waitq, &wait); | |
1673 | set_current_state(TASK_RUNNING); | |
1674 | ret = 0; | |
1675 | break; | |
1676 | } | |
1677 | ||
1678 | case DV1394_IOC_RECEIVE_FRAMES: { | |
1679 | unsigned int n_recv; | |
1680 | ||
1681 | if ( !video_card_initialized(video) ) { | |
1682 | ret = -EINVAL; | |
1683 | goto out; | |
1684 | } | |
1685 | ||
1686 | n_recv = (unsigned int) arg; | |
1687 | ||
1688 | /* at least one frame must be active */ | |
1689 | if (n_recv > (video->n_frames-1) ) { | |
1690 | ret = -EINVAL; | |
1691 | goto out; | |
1692 | } | |
1693 | ||
1694 | spin_lock_irqsave(&video->spinlock, flags); | |
1695 | ||
1696 | /* release the clear frames */ | |
1697 | video->n_clear_frames -= n_recv; | |
1698 | ||
1699 | /* advance the clear frame cursor */ | |
1700 | video->first_clear_frame = (video->first_clear_frame + n_recv) % video->n_frames; | |
1701 | ||
1702 | /* reset dropped_frames */ | |
1703 | video->dropped_frames = 0; | |
1704 | ||
1705 | spin_unlock_irqrestore(&video->spinlock, flags); | |
1706 | ||
1707 | ret = 0; | |
1708 | break; | |
1709 | } | |
1710 | ||
1711 | case DV1394_IOC_START_RECEIVE: { | |
1712 | if ( !video_card_initialized(video) ) { | |
1713 | ret = do_dv1394_init_default(video); | |
1714 | if (ret) | |
1715 | goto out; | |
1716 | } | |
1717 | ||
1718 | video->continuity_counter = -1; | |
1719 | ||
1720 | receive_packets(video); | |
1721 | ||
1722 | start_dma_receive(video); | |
1723 | ||
1724 | ret = 0; | |
1725 | break; | |
1726 | } | |
1727 | ||
1728 | case DV1394_IOC_INIT: { | |
1729 | struct dv1394_init init; | |
1730 | if (!argp) { | |
1731 | ret = do_dv1394_init_default(video); | |
1732 | } else { | |
1733 | if (copy_from_user(&init, argp, sizeof(init))) { | |
1734 | ret = -EFAULT; | |
1735 | goto out; | |
1736 | } | |
1737 | ret = do_dv1394_init(video, &init); | |
1738 | } | |
1739 | break; | |
1740 | } | |
1741 | ||
1742 | case DV1394_IOC_SHUTDOWN: | |
1743 | do_dv1394_shutdown(video, 0); | |
1744 | ret = 0; | |
1745 | break; | |
1746 | ||
1747 | ||
1748 | case DV1394_IOC_GET_STATUS: { | |
1749 | struct dv1394_status status; | |
1750 | ||
1751 | if ( !video_card_initialized(video) ) { | |
1752 | ret = -EINVAL; | |
1753 | goto out; | |
1754 | } | |
1755 | ||
1756 | status.init.api_version = DV1394_API_VERSION; | |
1757 | status.init.channel = video->channel; | |
1758 | status.init.n_frames = video->n_frames; | |
1759 | status.init.format = video->pal_or_ntsc; | |
1760 | status.init.cip_n = video->cip_n; | |
1761 | status.init.cip_d = video->cip_d; | |
1762 | status.init.syt_offset = video->syt_offset; | |
1763 | ||
1764 | status.first_clear_frame = video->first_clear_frame; | |
1765 | ||
1766 | /* the rest of the fields need to be locked against the interrupt */ | |
1767 | spin_lock_irqsave(&video->spinlock, flags); | |
1768 | ||
1769 | status.active_frame = video->active_frame; | |
1770 | status.n_clear_frames = video->n_clear_frames; | |
1771 | ||
1772 | status.dropped_frames = video->dropped_frames; | |
1773 | ||
1774 | /* reset dropped_frames */ | |
1775 | video->dropped_frames = 0; | |
1776 | ||
1777 | spin_unlock_irqrestore(&video->spinlock, flags); | |
1778 | ||
1779 | if (copy_to_user(argp, &status, sizeof(status))) { | |
1780 | ret = -EFAULT; | |
1781 | goto out; | |
1782 | } | |
1783 | ||
1784 | ret = 0; | |
1785 | break; | |
1786 | } | |
1787 | ||
1788 | default: | |
1789 | break; | |
1790 | } | |
1791 | ||
1792 | out: | |
1793 | up(&video->sem); | |
1794 | unlock_kernel(); | |
1795 | return ret; | |
1796 | } | |
1797 | ||
1798 | /*** DEVICE FILE INTERFACE CONTINUED ***************************************/ | |
1799 | ||
1800 | static int dv1394_open(struct inode *inode, struct file *file) | |
1801 | { | |
1802 | struct video_card *video = NULL; | |
1803 | ||
1804 | /* if the device was opened through devfs, then file->private_data | |
1805 | has already been set to video by devfs */ | |
1806 | if (file->private_data) { | |
1807 | video = (struct video_card*) file->private_data; | |
1808 | ||
1809 | } else { | |
1810 | /* look up the card by ID */ | |
1811 | unsigned long flags; | |
1812 | ||
1813 | spin_lock_irqsave(&dv1394_cards_lock, flags); | |
1814 | if (!list_empty(&dv1394_cards)) { | |
1815 | struct video_card *p; | |
1816 | list_for_each_entry(p, &dv1394_cards, list) { | |
1817 | if ((p->id) == ieee1394_file_to_instance(file)) { | |
1818 | video = p; | |
1819 | break; | |
1820 | } | |
1821 | } | |
1822 | } | |
1823 | spin_unlock_irqrestore(&dv1394_cards_lock, flags); | |
1824 | ||
1825 | if (!video) { | |
1826 | debug_printk("dv1394: OHCI card %d not found", ieee1394_file_to_instance(file)); | |
1827 | return -ENODEV; | |
1828 | } | |
1829 | ||
1830 | file->private_data = (void*) video; | |
1831 | } | |
1832 | ||
1833 | #ifndef DV1394_ALLOW_MORE_THAN_ONE_OPEN | |
1834 | ||
1835 | if ( test_and_set_bit(0, &video->open) ) { | |
1836 | /* video is already open by someone else */ | |
1837 | return -EBUSY; | |
1838 | } | |
1839 | ||
1840 | #endif | |
1841 | ||
1842 | return 0; | |
1843 | } | |
1844 | ||
1845 | ||
1846 | static int dv1394_release(struct inode *inode, struct file *file) | |
1847 | { | |
1848 | struct video_card *video = file_to_video_card(file); | |
1849 | ||
1850 | /* OK to free the DMA buffer, no more mappings can exist */ | |
1851 | do_dv1394_shutdown(video, 1); | |
1852 | ||
1853 | /* clean up async I/O users */ | |
1854 | dv1394_fasync(-1, file, 0); | |
1855 | ||
1856 | /* give someone else a turn */ | |
1857 | clear_bit(0, &video->open); | |
1858 | ||
1859 | return 0; | |
1860 | } | |
1861 | ||
1862 | ||
1863 | /*** DEVICE DRIVER HANDLERS ************************************************/ | |
1864 | ||
1865 | static void it_tasklet_func(unsigned long data) | |
1866 | { | |
1867 | int wake = 0; | |
1868 | struct video_card *video = (struct video_card*) data; | |
1869 | ||
1870 | spin_lock(&video->spinlock); | |
1871 | ||
1872 | if (!video->dma_running) | |
1873 | goto out; | |
1874 | ||
1875 | irq_printk("ContextControl = %08x, CommandPtr = %08x\n", | |
1876 | reg_read(video->ohci, video->ohci_IsoXmitContextControlSet), | |
1877 | reg_read(video->ohci, video->ohci_IsoXmitCommandPtr) | |
1878 | ); | |
1879 | ||
1880 | ||
1881 | if ( (video->ohci_it_ctx != -1) && | |
1882 | (reg_read(video->ohci, video->ohci_IsoXmitContextControlSet) & (1 << 10)) ) { | |
1883 | ||
1884 | struct frame *f; | |
1885 | unsigned int frame, i; | |
1886 | ||
1887 | ||
1888 | if (video->active_frame == -1) | |
1889 | frame = 0; | |
1890 | else | |
1891 | frame = video->active_frame; | |
1892 | ||
1893 | /* check all the DMA-able frames */ | |
1894 | for (i = 0; i < video->n_frames; i++, frame = (frame+1) % video->n_frames) { | |
1895 | ||
1896 | irq_printk("IRQ checking frame %d...", frame); | |
1897 | f = video->frames[frame]; | |
1898 | if (f->state != FRAME_READY) { | |
1899 | irq_printk("clear, skipping\n"); | |
1900 | /* we don't own this frame */ | |
1901 | continue; | |
1902 | } | |
1903 | ||
1904 | irq_printk("DMA\n"); | |
1905 | ||
1906 | /* check the frame begin semaphore to see if we can free the previous frame */ | |
1907 | if ( *(f->frame_begin_timestamp) ) { | |
1908 | int prev_frame; | |
1909 | struct frame *prev_f; | |
1910 | ||
1911 | ||
1912 | ||
1913 | /* don't reset, need this later *(f->frame_begin_timestamp) = 0; */ | |
1914 | irq_printk(" BEGIN\n"); | |
1915 | ||
1916 | prev_frame = frame - 1; | |
1917 | if (prev_frame == -1) | |
1918 | prev_frame += video->n_frames; | |
1919 | prev_f = video->frames[prev_frame]; | |
1920 | ||
1921 | /* make sure we can actually garbage collect | |
1922 | this frame */ | |
1923 | if ( (prev_f->state == FRAME_READY) && | |
1924 | prev_f->done && (!f->done) ) | |
1925 | { | |
1926 | frame_reset(prev_f); | |
1927 | video->n_clear_frames++; | |
1928 | wake = 1; | |
1929 | video->active_frame = frame; | |
1930 | ||
1931 | irq_printk(" BEGIN - freeing previous frame %d, new active frame is %d\n", prev_frame, frame); | |
1932 | } else { | |
1933 | irq_printk(" BEGIN - can't free yet\n"); | |
1934 | } | |
1935 | ||
1936 | f->done = 1; | |
1937 | } | |
1938 | ||
1939 | ||
1940 | /* see if we need to set the timestamp for the next frame */ | |
1941 | if ( *(f->mid_frame_timestamp) ) { | |
1942 | struct frame *next_frame; | |
1943 | u32 begin_ts, ts_cyc, ts_off; | |
1944 | ||
1945 | *(f->mid_frame_timestamp) = 0; | |
1946 | ||
1947 | begin_ts = le32_to_cpu(*(f->frame_begin_timestamp)); | |
1948 | ||
1949 | irq_printk(" MIDDLE - first packet was sent at cycle %4u (%2u), assigned timestamp was (%2u) %4u\n", | |
1950 | begin_ts & 0x1FFF, begin_ts & 0xF, | |
1951 | f->assigned_timestamp >> 12, f->assigned_timestamp & 0xFFF); | |
1952 | ||
1953 | /* prepare next frame and assign timestamp */ | |
1954 | next_frame = video->frames[ (frame+1) % video->n_frames ]; | |
1955 | ||
1956 | if (next_frame->state == FRAME_READY) { | |
1957 | irq_printk(" MIDDLE - next frame is ready, good\n"); | |
1958 | } else { | |
1959 | debug_printk("dv1394: Underflow! At least one frame has been dropped.\n"); | |
1960 | next_frame = f; | |
1961 | } | |
1962 | ||
1963 | /* set the timestamp to the timestamp of the last frame sent, | |
1964 | plus the length of the last frame sent, plus the syt latency */ | |
1965 | ts_cyc = begin_ts & 0xF; | |
1966 | /* advance one frame, plus syt latency (typically 2-3) */ | |
1967 | ts_cyc += f->n_packets + video->syt_offset ; | |
1968 | ||
1969 | ts_off = 0; | |
1970 | ||
1971 | ts_cyc += ts_off/3072; | |
1972 | ts_off %= 3072; | |
1973 | ||
1974 | next_frame->assigned_timestamp = ((ts_cyc&0xF) << 12) + ts_off; | |
1975 | if (next_frame->cip_syt1) { | |
1976 | next_frame->cip_syt1->b[6] = next_frame->assigned_timestamp >> 8; | |
1977 | next_frame->cip_syt1->b[7] = next_frame->assigned_timestamp & 0xFF; | |
1978 | } | |
1979 | if (next_frame->cip_syt2) { | |
1980 | next_frame->cip_syt2->b[6] = next_frame->assigned_timestamp >> 8; | |
1981 | next_frame->cip_syt2->b[7] = next_frame->assigned_timestamp & 0xFF; | |
1982 | } | |
1983 | ||
1984 | } | |
1985 | ||
1986 | /* see if the frame looped */ | |
1987 | if ( *(f->frame_end_timestamp) ) { | |
1988 | ||
1989 | *(f->frame_end_timestamp) = 0; | |
1990 | ||
1991 | debug_printk(" END - the frame looped at least once\n"); | |
1992 | ||
1993 | video->dropped_frames++; | |
1994 | } | |
1995 | ||
1996 | } /* for (each frame) */ | |
1997 | } | |
1998 | ||
1999 | if (wake) { | |
2000 | kill_fasync(&video->fasync, SIGIO, POLL_OUT); | |
2001 | ||
2002 | /* wake readers/writers/ioctl'ers */ | |
2003 | wake_up_interruptible(&video->waitq); | |
2004 | } | |
2005 | ||
2006 | out: | |
2007 | spin_unlock(&video->spinlock); | |
2008 | } | |
2009 | ||
2010 | static void ir_tasklet_func(unsigned long data) | |
2011 | { | |
2012 | int wake = 0; | |
2013 | struct video_card *video = (struct video_card*) data; | |
2014 | ||
2015 | spin_lock(&video->spinlock); | |
2016 | ||
2017 | if (!video->dma_running) | |
2018 | goto out; | |
2019 | ||
2020 | if ( (video->ohci_ir_ctx != -1) && | |
2021 | (reg_read(video->ohci, video->ohci_IsoRcvContextControlSet) & (1 << 10)) ) { | |
2022 | ||
2023 | int sof=0; /* start-of-frame flag */ | |
2024 | struct frame *f; | |
2025 | u16 packet_length, packet_time; | |
2026 | int i, dbc=0; | |
2027 | struct DMA_descriptor_block *block = NULL; | |
2028 | u16 xferstatus; | |
2029 | ||
2030 | int next_i, prev_i; | |
2031 | struct DMA_descriptor_block *next = NULL; | |
2032 | dma_addr_t next_dma = 0; | |
2033 | struct DMA_descriptor_block *prev = NULL; | |
2034 | ||
2035 | /* loop over all descriptors in all frames */ | |
2036 | for (i = 0; i < video->n_frames*MAX_PACKETS; i++) { | |
2037 | struct packet *p = dma_region_i(&video->packet_buf, struct packet, video->current_packet); | |
2038 | ||
2039 | /* make sure we are seeing the latest changes to p */ | |
2040 | dma_region_sync_for_cpu(&video->packet_buf, | |
2041 | (unsigned long) p - (unsigned long) video->packet_buf.kvirt, | |
2042 | sizeof(struct packet)); | |
2043 | ||
2044 | packet_length = le16_to_cpu(p->data_length); | |
2045 | packet_time = le16_to_cpu(p->timestamp); | |
2046 | ||
2047 | irq_printk("received packet %02d, timestamp=%04x, length=%04x, sof=%02x%02x\n", video->current_packet, | |
2048 | packet_time, packet_length, | |
2049 | p->data[0], p->data[1]); | |
2050 | ||
2051 | /* get the descriptor based on packet_buffer cursor */ | |
2052 | f = video->frames[video->current_packet / MAX_PACKETS]; | |
2053 | block = &(f->descriptor_pool[video->current_packet % MAX_PACKETS]); | |
2054 | xferstatus = le32_to_cpu(block->u.in.il.q[3]) >> 16; | |
2055 | xferstatus &= 0x1F; | |
2056 | irq_printk("ir_tasklet_func: xferStatus/resCount [%d] = 0x%08x\n", i, le32_to_cpu(block->u.in.il.q[3]) ); | |
2057 | ||
2058 | /* get the current frame */ | |
2059 | f = video->frames[video->active_frame]; | |
2060 | ||
2061 | /* exclude empty packet */ | |
2062 | if (packet_length > 8 && xferstatus == 0x11) { | |
2063 | /* check for start of frame */ | |
2064 | /* DRD> Changed to check section type ([0]>>5==0) | |
2065 | and dif sequence ([1]>>4==0) */ | |
2066 | sof = ( (p->data[0] >> 5) == 0 && (p->data[1] >> 4) == 0); | |
2067 | ||
2068 | dbc = (int) (p->cip_h1 >> 24); | |
2069 | if ( video->continuity_counter != -1 && dbc > ((video->continuity_counter + 1) % 256) ) | |
2070 | { | |
2071 | printk(KERN_WARNING "dv1394: discontinuity detected, dropping all frames\n" ); | |
2072 | video->dropped_frames += video->n_clear_frames + 1; | |
2073 | video->first_frame = 0; | |
2074 | video->n_clear_frames = 0; | |
2075 | video->first_clear_frame = -1; | |
2076 | } | |
2077 | video->continuity_counter = dbc; | |
2078 | ||
2079 | if (!video->first_frame) { | |
2080 | if (sof) { | |
2081 | video->first_frame = 1; | |
2082 | } | |
2083 | ||
2084 | } else if (sof) { | |
2085 | /* close current frame */ | |
2086 | frame_reset(f); /* f->state = STATE_CLEAR */ | |
2087 | video->n_clear_frames++; | |
2088 | if (video->n_clear_frames > video->n_frames) { | |
2089 | video->dropped_frames++; | |
2090 | printk(KERN_WARNING "dv1394: dropped a frame during reception\n" ); | |
2091 | video->n_clear_frames = video->n_frames-1; | |
2092 | video->first_clear_frame = (video->first_clear_frame + 1) % video->n_frames; | |
2093 | } | |
2094 | if (video->first_clear_frame == -1) | |
2095 | video->first_clear_frame = video->active_frame; | |
2096 | ||
2097 | /* get the next frame */ | |
2098 | video->active_frame = (video->active_frame + 1) % video->n_frames; | |
2099 | f = video->frames[video->active_frame]; | |
2100 | irq_printk(" frame received, active_frame = %d, n_clear_frames = %d, first_clear_frame = %d\n", | |
2101 | video->active_frame, video->n_clear_frames, video->first_clear_frame); | |
2102 | } | |
2103 | if (video->first_frame) { | |
2104 | if (sof) { | |
2105 | /* open next frame */ | |
2106 | f->state = FRAME_READY; | |
2107 | } | |
2108 | ||
2109 | /* copy to buffer */ | |
2110 | if (f->n_packets > (video->frame_size / 480)) { | |
2111 | printk(KERN_ERR "frame buffer overflow during receive\n"); | |
2112 | } | |
2113 | ||
2114 | frame_put_packet(f, p); | |
2115 | ||
2116 | } /* first_frame */ | |
2117 | } | |
2118 | ||
2119 | /* stop, end of ready packets */ | |
2120 | else if (xferstatus == 0) { | |
2121 | break; | |
2122 | } | |
2123 | ||
2124 | /* reset xferStatus & resCount */ | |
2125 | block->u.in.il.q[3] = cpu_to_le32(512); | |
2126 | ||
2127 | /* terminate dma chain at this (next) packet */ | |
2128 | next_i = video->current_packet; | |
2129 | f = video->frames[next_i / MAX_PACKETS]; | |
2130 | next = &(f->descriptor_pool[next_i % MAX_PACKETS]); | |
2131 | next_dma = ((unsigned long) block - (unsigned long) f->descriptor_pool) + f->descriptor_pool_dma; | |
2132 | next->u.in.il.q[0] |= 3 << 20; /* enable interrupt */ | |
2133 | next->u.in.il.q[2] = 0; /* disable branch */ | |
2134 | ||
2135 | /* link previous to next */ | |
2136 | prev_i = (next_i == 0) ? (MAX_PACKETS * video->n_frames - 1) : (next_i - 1); | |
2137 | f = video->frames[prev_i / MAX_PACKETS]; | |
2138 | prev = &(f->descriptor_pool[prev_i % MAX_PACKETS]); | |
2139 | if (prev_i % (MAX_PACKETS/2)) { | |
2140 | prev->u.in.il.q[0] &= ~(3 << 20); /* no interrupt */ | |
2141 | } else { | |
2142 | prev->u.in.il.q[0] |= 3 << 20; /* enable interrupt */ | |
2143 | } | |
2144 | prev->u.in.il.q[2] = cpu_to_le32(next_dma | 1); /* set Z=1 */ | |
2145 | wmb(); | |
2146 | ||
2147 | /* wake up DMA in case it fell asleep */ | |
2148 | reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 12)); | |
2149 | ||
2150 | /* advance packet_buffer cursor */ | |
2151 | video->current_packet = (video->current_packet + 1) % (MAX_PACKETS * video->n_frames); | |
2152 | ||
2153 | } /* for all packets */ | |
2154 | ||
2155 | wake = 1; /* why the hell not? */ | |
2156 | ||
2157 | } /* receive interrupt */ | |
2158 | ||
2159 | if (wake) { | |
2160 | kill_fasync(&video->fasync, SIGIO, POLL_IN); | |
2161 | ||
2162 | /* wake readers/writers/ioctl'ers */ | |
2163 | wake_up_interruptible(&video->waitq); | |
2164 | } | |
2165 | ||
2166 | out: | |
2167 | spin_unlock(&video->spinlock); | |
2168 | } | |
2169 | ||
2170 | static struct cdev dv1394_cdev; | |
2171 | static struct file_operations dv1394_fops= | |
2172 | { | |
2173 | .owner = THIS_MODULE, | |
2174 | .poll = dv1394_poll, | |
2175 | .unlocked_ioctl = dv1394_ioctl, | |
2176 | #ifdef CONFIG_COMPAT | |
2177 | .compat_ioctl = dv1394_compat_ioctl, | |
2178 | #endif | |
2179 | .mmap = dv1394_mmap, | |
2180 | .open = dv1394_open, | |
2181 | .write = dv1394_write, | |
2182 | .read = dv1394_read, | |
2183 | .release = dv1394_release, | |
2184 | .fasync = dv1394_fasync, | |
2185 | }; | |
2186 | ||
2187 | ||
2188 | /*** HOTPLUG STUFF **********************************************************/ | |
2189 | /* | |
2190 | * Export information about protocols/devices supported by this driver. | |
2191 | */ | |
2192 | static struct ieee1394_device_id dv1394_id_table[] = { | |
2193 | { | |
2194 | .match_flags = IEEE1394_MATCH_SPECIFIER_ID | IEEE1394_MATCH_VERSION, | |
2195 | .specifier_id = AVC_UNIT_SPEC_ID_ENTRY & 0xffffff, | |
2196 | .version = AVC_SW_VERSION_ENTRY & 0xffffff | |
2197 | }, | |
2198 | { } | |
2199 | }; | |
2200 | ||
2201 | MODULE_DEVICE_TABLE(ieee1394, dv1394_id_table); | |
2202 | ||
2203 | static struct hpsb_protocol_driver dv1394_driver = { | |
2204 | .name = "DV/1394 Driver", | |
2205 | .id_table = dv1394_id_table, | |
2206 | .driver = { | |
2207 | .name = "dv1394", | |
2208 | .bus = &ieee1394_bus_type, | |
2209 | }, | |
2210 | }; | |
2211 | ||
2212 | ||
2213 | /*** IEEE1394 HPSB CALLBACKS ***********************************************/ | |
2214 | ||
2215 | static int dv1394_init(struct ti_ohci *ohci, enum pal_or_ntsc format, enum modes mode) | |
2216 | { | |
2217 | struct video_card *video; | |
2218 | unsigned long flags; | |
2219 | int i; | |
2220 | ||
2221 | video = kmalloc(sizeof(struct video_card), GFP_KERNEL); | |
2222 | if (!video) { | |
2223 | printk(KERN_ERR "dv1394: cannot allocate video_card\n"); | |
2224 | goto err; | |
2225 | } | |
2226 | ||
2227 | memset(video, 0, sizeof(struct video_card)); | |
2228 | ||
2229 | video->ohci = ohci; | |
2230 | /* lower 2 bits of id indicate which of four "plugs" | |
2231 | per host */ | |
2232 | video->id = ohci->host->id << 2; | |
2233 | if (format == DV1394_NTSC) | |
2234 | video->id |= mode; | |
2235 | else | |
2236 | video->id |= 2 + mode; | |
2237 | ||
2238 | video->ohci_it_ctx = -1; | |
2239 | video->ohci_ir_ctx = -1; | |
2240 | ||
2241 | video->ohci_IsoXmitContextControlSet = 0; | |
2242 | video->ohci_IsoXmitContextControlClear = 0; | |
2243 | video->ohci_IsoXmitCommandPtr = 0; | |
2244 | ||
2245 | video->ohci_IsoRcvContextControlSet = 0; | |
2246 | video->ohci_IsoRcvContextControlClear = 0; | |
2247 | video->ohci_IsoRcvCommandPtr = 0; | |
2248 | video->ohci_IsoRcvContextMatch = 0; | |
2249 | ||
2250 | video->n_frames = 0; /* flag that video is not initialized */ | |
2251 | video->channel = 63; /* default to broadcast channel */ | |
2252 | video->active_frame = -1; | |
2253 | ||
2254 | /* initialize the following */ | |
2255 | video->pal_or_ntsc = format; | |
2256 | video->cip_n = 0; /* 0 = use builtin default */ | |
2257 | video->cip_d = 0; | |
2258 | video->syt_offset = 0; | |
2259 | video->mode = mode; | |
2260 | ||
2261 | for (i = 0; i < DV1394_MAX_FRAMES; i++) | |
2262 | video->frames[i] = NULL; | |
2263 | ||
2264 | dma_region_init(&video->dv_buf); | |
2265 | video->dv_buf_size = 0; | |
2266 | dma_region_init(&video->packet_buf); | |
2267 | video->packet_buf_size = 0; | |
2268 | ||
2269 | clear_bit(0, &video->open); | |
2270 | spin_lock_init(&video->spinlock); | |
2271 | video->dma_running = 0; | |
2272 | init_MUTEX(&video->sem); | |
2273 | init_waitqueue_head(&video->waitq); | |
2274 | video->fasync = NULL; | |
2275 | ||
2276 | spin_lock_irqsave(&dv1394_cards_lock, flags); | |
2277 | INIT_LIST_HEAD(&video->list); | |
2278 | list_add_tail(&video->list, &dv1394_cards); | |
2279 | spin_unlock_irqrestore(&dv1394_cards_lock, flags); | |
2280 | ||
2281 | if (devfs_mk_cdev(MKDEV(IEEE1394_MAJOR, | |
2282 | IEEE1394_MINOR_BLOCK_DV1394*16 + video->id), | |
2283 | S_IFCHR|S_IRUGO|S_IWUGO, | |
2284 | "ieee1394/dv/host%d/%s/%s", | |
2285 | (video->id>>2), | |
2286 | (video->pal_or_ntsc == DV1394_NTSC ? "NTSC" : "PAL"), | |
2287 | (video->mode == MODE_RECEIVE ? "in" : "out")) < 0) | |
2288 | goto err_free; | |
2289 | ||
2290 | debug_printk("dv1394: dv1394_init() OK on ID %d\n", video->id); | |
2291 | ||
2292 | return 0; | |
2293 | ||
2294 | err_free: | |
2295 | kfree(video); | |
2296 | err: | |
2297 | return -1; | |
2298 | } | |
2299 | ||
2300 | static void dv1394_un_init(struct video_card *video) | |
2301 | { | |
2302 | char buf[32]; | |
2303 | ||
2304 | /* obviously nobody has the driver open at this point */ | |
2305 | do_dv1394_shutdown(video, 1); | |
2306 | snprintf(buf, sizeof(buf), "dv/host%d/%s/%s", (video->id >> 2), | |
2307 | (video->pal_or_ntsc == DV1394_NTSC ? "NTSC" : "PAL"), | |
2308 | (video->mode == MODE_RECEIVE ? "in" : "out") | |
2309 | ); | |
2310 | ||
2311 | devfs_remove("ieee1394/%s", buf); | |
2312 | kfree(video); | |
2313 | } | |
2314 | ||
2315 | ||
2316 | static void dv1394_remove_host (struct hpsb_host *host) | |
2317 | { | |
2318 | struct video_card *video; | |
2319 | unsigned long flags; | |
2320 | int id = host->id; | |
2321 | ||
2322 | /* We only work with the OHCI-1394 driver */ | |
2323 | if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME)) | |
2324 | return; | |
2325 | ||
2326 | /* find the corresponding video_cards */ | |
2327 | do { | |
2328 | struct video_card *tmp_vid; | |
2329 | ||
2330 | video = NULL; | |
2331 | ||
2332 | spin_lock_irqsave(&dv1394_cards_lock, flags); | |
2333 | list_for_each_entry(tmp_vid, &dv1394_cards, list) { | |
2334 | if ((tmp_vid->id >> 2) == id) { | |
2335 | list_del(&tmp_vid->list); | |
2336 | video = tmp_vid; | |
2337 | break; | |
2338 | } | |
2339 | } | |
2340 | spin_unlock_irqrestore(&dv1394_cards_lock, flags); | |
2341 | ||
2342 | if (video) | |
2343 | dv1394_un_init(video); | |
2344 | } while (video != NULL); | |
2345 | ||
7e25ab91 | 2346 | class_device_destroy(hpsb_protocol_class, |
2347 | MKDEV(IEEE1394_MAJOR, IEEE1394_MINOR_BLOCK_DV1394 * 16 + (id<<2))); | |
1da177e4 LT |
2348 | devfs_remove("ieee1394/dv/host%d/NTSC", id); |
2349 | devfs_remove("ieee1394/dv/host%d/PAL", id); | |
2350 | devfs_remove("ieee1394/dv/host%d", id); | |
2351 | } | |
2352 | ||
2353 | static void dv1394_add_host (struct hpsb_host *host) | |
2354 | { | |
2355 | struct ti_ohci *ohci; | |
2356 | int id = host->id; | |
2357 | ||
2358 | /* We only work with the OHCI-1394 driver */ | |
2359 | if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME)) | |
2360 | return; | |
2361 | ||
2362 | ohci = (struct ti_ohci *)host->hostdata; | |
2363 | ||
7e25ab91 | 2364 | class_device_create(hpsb_protocol_class, MKDEV( |
1da177e4 LT |
2365 | IEEE1394_MAJOR, IEEE1394_MINOR_BLOCK_DV1394 * 16 + (id<<2)), |
2366 | NULL, "dv1394-%d", id); | |
2367 | devfs_mk_dir("ieee1394/dv/host%d", id); | |
2368 | devfs_mk_dir("ieee1394/dv/host%d/NTSC", id); | |
2369 | devfs_mk_dir("ieee1394/dv/host%d/PAL", id); | |
2370 | ||
2371 | dv1394_init(ohci, DV1394_NTSC, MODE_RECEIVE); | |
2372 | dv1394_init(ohci, DV1394_NTSC, MODE_TRANSMIT); | |
2373 | dv1394_init(ohci, DV1394_PAL, MODE_RECEIVE); | |
2374 | dv1394_init(ohci, DV1394_PAL, MODE_TRANSMIT); | |
2375 | } | |
2376 | ||
2377 | ||
2378 | /* Bus reset handler. In the event of a bus reset, we may need to | |
2379 | re-start the DMA contexts - otherwise the user program would | |
2380 | end up waiting forever. | |
2381 | */ | |
2382 | ||
2383 | static void dv1394_host_reset(struct hpsb_host *host) | |
2384 | { | |
2385 | struct ti_ohci *ohci; | |
2386 | struct video_card *video = NULL, *tmp_vid; | |
2387 | unsigned long flags; | |
2388 | ||
2389 | /* We only work with the OHCI-1394 driver */ | |
2390 | if (strcmp(host->driver->name, OHCI1394_DRIVER_NAME)) | |
2391 | return; | |
2392 | ||
2393 | ohci = (struct ti_ohci *)host->hostdata; | |
2394 | ||
2395 | ||
2396 | /* find the corresponding video_cards */ | |
2397 | spin_lock_irqsave(&dv1394_cards_lock, flags); | |
2398 | list_for_each_entry(tmp_vid, &dv1394_cards, list) { | |
2399 | if ((tmp_vid->id >> 2) == host->id) { | |
2400 | video = tmp_vid; | |
2401 | break; | |
2402 | } | |
2403 | } | |
2404 | spin_unlock_irqrestore(&dv1394_cards_lock, flags); | |
2405 | ||
2406 | if (!video) | |
2407 | return; | |
2408 | ||
2409 | ||
2410 | spin_lock_irqsave(&video->spinlock, flags); | |
2411 | ||
2412 | if (!video->dma_running) | |
2413 | goto out; | |
2414 | ||
2415 | /* check IT context */ | |
2416 | if (video->ohci_it_ctx != -1) { | |
2417 | u32 ctx; | |
2418 | ||
2419 | ctx = reg_read(video->ohci, video->ohci_IsoXmitContextControlSet); | |
2420 | ||
2421 | /* if (RUN but not ACTIVE) */ | |
2422 | if ( (ctx & (1<<15)) && | |
2423 | !(ctx & (1<<10)) ) { | |
2424 | ||
2425 | debug_printk("dv1394: IT context stopped due to bus reset; waking it up\n"); | |
2426 | ||
2427 | /* to be safe, assume a frame has been dropped. User-space programs | |
2428 | should handle this condition like an underflow. */ | |
2429 | video->dropped_frames++; | |
2430 | ||
2431 | /* for some reason you must clear, then re-set the RUN bit to restart DMA */ | |
2432 | ||
2433 | /* clear RUN */ | |
2434 | reg_write(video->ohci, video->ohci_IsoXmitContextControlClear, (1 << 15)); | |
2435 | flush_pci_write(video->ohci); | |
2436 | ||
2437 | /* set RUN */ | |
2438 | reg_write(video->ohci, video->ohci_IsoXmitContextControlSet, (1 << 15)); | |
2439 | flush_pci_write(video->ohci); | |
2440 | ||
2441 | /* set the WAKE bit (just in case; this isn't strictly necessary) */ | |
2442 | reg_write(video->ohci, video->ohci_IsoXmitContextControlSet, (1 << 12)); | |
2443 | flush_pci_write(video->ohci); | |
2444 | ||
2445 | irq_printk("dv1394: AFTER IT restart ctx 0x%08x ptr 0x%08x\n", | |
2446 | reg_read(video->ohci, video->ohci_IsoXmitContextControlSet), | |
2447 | reg_read(video->ohci, video->ohci_IsoXmitCommandPtr)); | |
2448 | } | |
2449 | } | |
2450 | ||
2451 | /* check IR context */ | |
2452 | if (video->ohci_ir_ctx != -1) { | |
2453 | u32 ctx; | |
2454 | ||
2455 | ctx = reg_read(video->ohci, video->ohci_IsoRcvContextControlSet); | |
2456 | ||
2457 | /* if (RUN but not ACTIVE) */ | |
2458 | if ( (ctx & (1<<15)) && | |
2459 | !(ctx & (1<<10)) ) { | |
2460 | ||
2461 | debug_printk("dv1394: IR context stopped due to bus reset; waking it up\n"); | |
2462 | ||
2463 | /* to be safe, assume a frame has been dropped. User-space programs | |
2464 | should handle this condition like an overflow. */ | |
2465 | video->dropped_frames++; | |
2466 | ||
2467 | /* for some reason you must clear, then re-set the RUN bit to restart DMA */ | |
2468 | /* XXX this doesn't work for me, I can't get IR DMA to restart :[ */ | |
2469 | ||
2470 | /* clear RUN */ | |
2471 | reg_write(video->ohci, video->ohci_IsoRcvContextControlClear, (1 << 15)); | |
2472 | flush_pci_write(video->ohci); | |
2473 | ||
2474 | /* set RUN */ | |
2475 | reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 15)); | |
2476 | flush_pci_write(video->ohci); | |
2477 | ||
2478 | /* set the WAKE bit (just in case; this isn't strictly necessary) */ | |
2479 | reg_write(video->ohci, video->ohci_IsoRcvContextControlSet, (1 << 12)); | |
2480 | flush_pci_write(video->ohci); | |
2481 | ||
2482 | irq_printk("dv1394: AFTER IR restart ctx 0x%08x ptr 0x%08x\n", | |
2483 | reg_read(video->ohci, video->ohci_IsoRcvContextControlSet), | |
2484 | reg_read(video->ohci, video->ohci_IsoRcvCommandPtr)); | |
2485 | } | |
2486 | } | |
2487 | ||
2488 | out: | |
2489 | spin_unlock_irqrestore(&video->spinlock, flags); | |
2490 | ||
2491 | /* wake readers/writers/ioctl'ers */ | |
2492 | wake_up_interruptible(&video->waitq); | |
2493 | } | |
2494 | ||
2495 | static struct hpsb_highlevel dv1394_highlevel = { | |
2496 | .name = "dv1394", | |
2497 | .add_host = dv1394_add_host, | |
2498 | .remove_host = dv1394_remove_host, | |
2499 | .host_reset = dv1394_host_reset, | |
2500 | }; | |
2501 | ||
2502 | #ifdef CONFIG_COMPAT | |
2503 | ||
2504 | #define DV1394_IOC32_INIT _IOW('#', 0x06, struct dv1394_init32) | |
2505 | #define DV1394_IOC32_GET_STATUS _IOR('#', 0x0c, struct dv1394_status32) | |
2506 | ||
2507 | struct dv1394_init32 { | |
2508 | u32 api_version; | |
2509 | u32 channel; | |
2510 | u32 n_frames; | |
2511 | u32 format; | |
2512 | u32 cip_n; | |
2513 | u32 cip_d; | |
2514 | u32 syt_offset; | |
2515 | }; | |
2516 | ||
2517 | struct dv1394_status32 { | |
2518 | struct dv1394_init32 init; | |
2519 | s32 active_frame; | |
2520 | u32 first_clear_frame; | |
2521 | u32 n_clear_frames; | |
2522 | u32 dropped_frames; | |
2523 | }; | |
2524 | ||
2525 | /* RED-PEN: this should use compat_alloc_userspace instead */ | |
2526 | ||
2527 | static int handle_dv1394_init(struct file *file, unsigned int cmd, unsigned long arg) | |
2528 | { | |
2529 | struct dv1394_init32 dv32; | |
2530 | struct dv1394_init dv; | |
2531 | mm_segment_t old_fs; | |
2532 | int ret; | |
2533 | ||
2534 | if (file->f_op->unlocked_ioctl != dv1394_ioctl) | |
2535 | return -EFAULT; | |
2536 | ||
2537 | if (copy_from_user(&dv32, (void __user *)arg, sizeof(dv32))) | |
2538 | return -EFAULT; | |
2539 | ||
2540 | dv.api_version = dv32.api_version; | |
2541 | dv.channel = dv32.channel; | |
2542 | dv.n_frames = dv32.n_frames; | |
2543 | dv.format = dv32.format; | |
2544 | dv.cip_n = (unsigned long)dv32.cip_n; | |
2545 | dv.cip_d = (unsigned long)dv32.cip_d; | |
2546 | dv.syt_offset = dv32.syt_offset; | |
2547 | ||
2548 | old_fs = get_fs(); | |
2549 | set_fs(KERNEL_DS); | |
2550 | ret = dv1394_ioctl(file, DV1394_IOC_INIT, (unsigned long)&dv); | |
2551 | set_fs(old_fs); | |
2552 | ||
2553 | return ret; | |
2554 | } | |
2555 | ||
2556 | static int handle_dv1394_get_status(struct file *file, unsigned int cmd, unsigned long arg) | |
2557 | { | |
2558 | struct dv1394_status32 dv32; | |
2559 | struct dv1394_status dv; | |
2560 | mm_segment_t old_fs; | |
2561 | int ret; | |
2562 | ||
2563 | if (file->f_op->unlocked_ioctl != dv1394_ioctl) | |
2564 | return -EFAULT; | |
2565 | ||
2566 | old_fs = get_fs(); | |
2567 | set_fs(KERNEL_DS); | |
2568 | ret = dv1394_ioctl(file, DV1394_IOC_GET_STATUS, (unsigned long)&dv); | |
2569 | set_fs(old_fs); | |
2570 | ||
2571 | if (!ret) { | |
2572 | dv32.init.api_version = dv.init.api_version; | |
2573 | dv32.init.channel = dv.init.channel; | |
2574 | dv32.init.n_frames = dv.init.n_frames; | |
2575 | dv32.init.format = dv.init.format; | |
2576 | dv32.init.cip_n = (u32)dv.init.cip_n; | |
2577 | dv32.init.cip_d = (u32)dv.init.cip_d; | |
2578 | dv32.init.syt_offset = dv.init.syt_offset; | |
2579 | dv32.active_frame = dv.active_frame; | |
2580 | dv32.first_clear_frame = dv.first_clear_frame; | |
2581 | dv32.n_clear_frames = dv.n_clear_frames; | |
2582 | dv32.dropped_frames = dv.dropped_frames; | |
2583 | ||
2584 | if (copy_to_user((struct dv1394_status32 __user *)arg, &dv32, sizeof(dv32))) | |
2585 | ret = -EFAULT; | |
2586 | } | |
2587 | ||
2588 | return ret; | |
2589 | } | |
2590 | ||
2591 | ||
2592 | ||
2593 | static long dv1394_compat_ioctl(struct file *file, unsigned int cmd, | |
2594 | unsigned long arg) | |
2595 | { | |
2596 | switch (cmd) { | |
2597 | case DV1394_IOC_SHUTDOWN: | |
2598 | case DV1394_IOC_SUBMIT_FRAMES: | |
2599 | case DV1394_IOC_WAIT_FRAMES: | |
2600 | case DV1394_IOC_RECEIVE_FRAMES: | |
2601 | case DV1394_IOC_START_RECEIVE: | |
2602 | return dv1394_ioctl(file, cmd, arg); | |
2603 | ||
2604 | case DV1394_IOC32_INIT: | |
2605 | return handle_dv1394_init(file, cmd, arg); | |
2606 | case DV1394_IOC32_GET_STATUS: | |
2607 | return handle_dv1394_get_status(file, cmd, arg); | |
2608 | default: | |
2609 | return -ENOIOCTLCMD; | |
2610 | } | |
2611 | } | |
2612 | ||
2613 | #endif /* CONFIG_COMPAT */ | |
2614 | ||
2615 | ||
2616 | /*** KERNEL MODULE HANDLERS ************************************************/ | |
2617 | ||
2618 | MODULE_AUTHOR("Dan Maas <dmaas@dcine.com>, Dan Dennedy <dan@dennedy.org>"); | |
2619 | MODULE_DESCRIPTION("driver for DV input/output on OHCI board"); | |
2620 | MODULE_SUPPORTED_DEVICE("dv1394"); | |
2621 | MODULE_LICENSE("GPL"); | |
2622 | ||
2623 | static void __exit dv1394_exit_module(void) | |
2624 | { | |
2625 | hpsb_unregister_protocol(&dv1394_driver); | |
2626 | ||
2627 | hpsb_unregister_highlevel(&dv1394_highlevel); | |
2628 | cdev_del(&dv1394_cdev); | |
2629 | devfs_remove("ieee1394/dv"); | |
2630 | } | |
2631 | ||
2632 | static int __init dv1394_init_module(void) | |
2633 | { | |
2634 | int ret; | |
2635 | ||
2636 | cdev_init(&dv1394_cdev, &dv1394_fops); | |
2637 | dv1394_cdev.owner = THIS_MODULE; | |
2638 | kobject_set_name(&dv1394_cdev.kobj, "dv1394"); | |
2639 | ret = cdev_add(&dv1394_cdev, IEEE1394_DV1394_DEV, 16); | |
2640 | if (ret) { | |
2641 | printk(KERN_ERR "dv1394: unable to register character device\n"); | |
2642 | return ret; | |
2643 | } | |
2644 | ||
2645 | devfs_mk_dir("ieee1394/dv"); | |
2646 | ||
2647 | hpsb_register_highlevel(&dv1394_highlevel); | |
2648 | ||
2649 | ret = hpsb_register_protocol(&dv1394_driver); | |
2650 | if (ret) { | |
2651 | printk(KERN_ERR "dv1394: failed to register protocol\n"); | |
2652 | hpsb_unregister_highlevel(&dv1394_highlevel); | |
2653 | devfs_remove("ieee1394/dv"); | |
2654 | cdev_del(&dv1394_cdev); | |
2655 | return ret; | |
2656 | } | |
2657 | ||
2658 | return 0; | |
2659 | } | |
2660 | ||
2661 | module_init(dv1394_init_module); | |
2662 | module_exit(dv1394_exit_module); | |
2663 | MODULE_ALIAS_CHARDEV(IEEE1394_MAJOR, IEEE1394_MINOR_BLOCK_DV1394 * 16); |