1 /* interrupt handling
2 Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
3 Copyright (C) 2004 Chris Kennedy <c@groovy.org>
4 Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include "ivtv-driver.h"
22 #include "ivtv-queue.h"
23 #include "ivtv-udma.h"
24 #include "ivtv-irq.h"
25 #include "ivtv-mailbox.h"
26 #include "ivtv-vbi.h"
27 #include "ivtv-yuv.h"
28 #include <media/v4l2-event.h>
29
30 #define DMA_MAGIC_COOKIE 0x000001fe
31
32 static void ivtv_dma_dec_start(struct ivtv_stream *s);
33
34 static const int ivtv_stream_map[] = {
35 IVTV_ENC_STREAM_TYPE_MPG,
36 IVTV_ENC_STREAM_TYPE_YUV,
37 IVTV_ENC_STREAM_TYPE_PCM,
38 IVTV_ENC_STREAM_TYPE_VBI,
39 };
40
41
ivtv_pio_work_handler(struct ivtv * itv)42 static void ivtv_pio_work_handler(struct ivtv *itv)
43 {
44 struct ivtv_stream *s = &itv->streams[itv->cur_pio_stream];
45 struct ivtv_buffer *buf;
46 int i = 0;
47
48 IVTV_DEBUG_HI_DMA("ivtv_pio_work_handler\n");
49 if (itv->cur_pio_stream < 0 || itv->cur_pio_stream >= IVTV_MAX_STREAMS ||
50 s->vdev == NULL || !ivtv_use_pio(s)) {
51 itv->cur_pio_stream = -1;
52 /* trigger PIO complete user interrupt */
53 write_reg(IVTV_IRQ_ENC_PIO_COMPLETE, 0x44);
54 return;
55 }
56 IVTV_DEBUG_HI_DMA("Process PIO %s\n", s->name);
57 list_for_each_entry(buf, &s->q_dma.list, list) {
58 u32 size = s->sg_processing[i].size & 0x3ffff;
59
60 /* Copy the data from the card to the buffer */
61 if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
62 memcpy_fromio(buf->buf, itv->dec_mem + s->sg_processing[i].src - IVTV_DECODER_OFFSET, size);
63 }
64 else {
65 memcpy_fromio(buf->buf, itv->enc_mem + s->sg_processing[i].src, size);
66 }
67 i++;
68 if (i == s->sg_processing_size)
69 break;
70 }
71 write_reg(IVTV_IRQ_ENC_PIO_COMPLETE, 0x44);
72 }
73
ivtv_irq_work_handler(struct kthread_work * work)74 void ivtv_irq_work_handler(struct kthread_work *work)
75 {
76 struct ivtv *itv = container_of(work, struct ivtv, irq_work);
77
78 if (test_and_clear_bit(IVTV_F_I_WORK_HANDLER_PIO, &itv->i_flags))
79 ivtv_pio_work_handler(itv);
80
81 if (test_and_clear_bit(IVTV_F_I_WORK_HANDLER_VBI, &itv->i_flags))
82 ivtv_vbi_work_handler(itv);
83
84 if (test_and_clear_bit(IVTV_F_I_WORK_HANDLER_YUV, &itv->i_flags))
85 ivtv_yuv_work_handler(itv);
86 }
87
88 /* Determine the required DMA size, setup enough buffers in the predma queue and
89 actually copy the data from the card to the buffers in case a PIO transfer is
90 required for this stream.
91 */
stream_enc_dma_append(struct ivtv_stream * s,u32 data[CX2341X_MBOX_MAX_DATA])92 static int stream_enc_dma_append(struct ivtv_stream *s, u32 data[CX2341X_MBOX_MAX_DATA])
93 {
94 struct ivtv *itv = s->itv;
95 struct ivtv_buffer *buf;
96 u32 bytes_needed = 0;
97 u32 offset, size;
98 u32 UVoffset = 0, UVsize = 0;
99 int skip_bufs = s->q_predma.buffers;
100 int idx = s->sg_pending_size;
101 int rc;
102
103 /* sanity checks */
104 if (s->vdev == NULL) {
105 IVTV_DEBUG_WARN("Stream %s not started\n", s->name);
106 return -1;
107 }
108 if (!test_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
109 IVTV_DEBUG_WARN("Stream %s not open\n", s->name);
110 return -1;
111 }
112
113 /* determine offset, size and PTS for the various streams */
114 switch (s->type) {
115 case IVTV_ENC_STREAM_TYPE_MPG:
116 offset = data[1];
117 size = data[2];
118 s->pending_pts = 0;
119 break;
120
121 case IVTV_ENC_STREAM_TYPE_YUV:
122 offset = data[1];
123 size = data[2];
124 UVoffset = data[3];
125 UVsize = data[4];
126 s->pending_pts = ((u64) data[5] << 32) | data[6];
127 break;
128
129 case IVTV_ENC_STREAM_TYPE_PCM:
130 offset = data[1] + 12;
131 size = data[2] - 12;
132 s->pending_pts = read_dec(offset - 8) |
133 ((u64)(read_dec(offset - 12)) << 32);
134 if (itv->has_cx23415)
135 offset += IVTV_DECODER_OFFSET;
136 break;
137
138 case IVTV_ENC_STREAM_TYPE_VBI:
139 size = itv->vbi.enc_size * itv->vbi.fpi;
140 offset = read_enc(itv->vbi.enc_start - 4) + 12;
141 if (offset == 12) {
142 IVTV_DEBUG_INFO("VBI offset == 0\n");
143 return -1;
144 }
145 s->pending_pts = read_enc(offset - 4) | ((u64)read_enc(offset - 8) << 32);
146 break;
147
148 case IVTV_DEC_STREAM_TYPE_VBI:
149 size = read_dec(itv->vbi.dec_start + 4) + 8;
150 offset = read_dec(itv->vbi.dec_start) + itv->vbi.dec_start;
151 s->pending_pts = 0;
152 offset += IVTV_DECODER_OFFSET;
153 break;
154 default:
155 /* shouldn't happen */
156 return -1;
157 }
158
159 /* if this is the start of the DMA then fill in the magic cookie */
160 if (s->sg_pending_size == 0 && ivtv_use_dma(s)) {
161 if (itv->has_cx23415 && (s->type == IVTV_ENC_STREAM_TYPE_PCM ||
162 s->type == IVTV_DEC_STREAM_TYPE_VBI)) {
163 s->pending_backup = read_dec(offset - IVTV_DECODER_OFFSET);
164 write_dec_sync(cpu_to_le32(DMA_MAGIC_COOKIE), offset - IVTV_DECODER_OFFSET);
165 }
166 else {
167 s->pending_backup = read_enc(offset);
168 write_enc_sync(cpu_to_le32(DMA_MAGIC_COOKIE), offset);
169 }
170 s->pending_offset = offset;
171 }
172
173 bytes_needed = size;
174 if (s->type == IVTV_ENC_STREAM_TYPE_YUV) {
175 /* The size for the Y samples needs to be rounded upwards to a
176 multiple of the buf_size. The UV samples then start in the
177 next buffer. */
178 bytes_needed = s->buf_size * ((bytes_needed + s->buf_size - 1) / s->buf_size);
179 bytes_needed += UVsize;
180 }
181
182 IVTV_DEBUG_HI_DMA("%s %s: 0x%08x bytes at 0x%08x\n",
183 ivtv_use_pio(s) ? "PIO" : "DMA", s->name, bytes_needed, offset);
184
185 rc = ivtv_queue_move(s, &s->q_free, &s->q_full, &s->q_predma, bytes_needed);
186 if (rc < 0) { /* Insufficient buffers */
187 IVTV_DEBUG_WARN("Cannot obtain %d bytes for %s data transfer\n",
188 bytes_needed, s->name);
189 return -1;
190 }
191 if (rc && !s->buffers_stolen && test_bit(IVTV_F_S_APPL_IO, &s->s_flags)) {
192 IVTV_WARN("All %s stream buffers are full. Dropping data.\n", s->name);
193 IVTV_WARN("Cause: the application is not reading fast enough.\n");
194 }
195 s->buffers_stolen = rc;
196
197 /* got the buffers, now fill in sg_pending */
198 buf = list_entry(s->q_predma.list.next, struct ivtv_buffer, list);
199 memset(buf->buf, 0, 128);
200 list_for_each_entry(buf, &s->q_predma.list, list) {
201 if (skip_bufs-- > 0)
202 continue;
203 s->sg_pending[idx].dst = buf->dma_handle;
204 s->sg_pending[idx].src = offset;
205 s->sg_pending[idx].size = s->buf_size;
206 buf->bytesused = min(size, s->buf_size);
207 buf->dma_xfer_cnt = s->dma_xfer_cnt;
208
209 s->q_predma.bytesused += buf->bytesused;
210 size -= buf->bytesused;
211 offset += s->buf_size;
212
213 /* Sync SG buffers */
214 ivtv_buf_sync_for_device(s, buf);
215
216 if (size == 0) { /* YUV */
217 /* process the UV section */
218 offset = UVoffset;
219 size = UVsize;
220 }
221 idx++;
222 }
223 s->sg_pending_size = idx;
224 return 0;
225 }
226
dma_post(struct ivtv_stream * s)227 static void dma_post(struct ivtv_stream *s)
228 {
229 struct ivtv *itv = s->itv;
230 struct ivtv_buffer *buf = NULL;
231 struct list_head *p;
232 u32 offset;
233 __le32 *u32buf;
234 int x = 0;
235
236 IVTV_DEBUG_HI_DMA("%s %s completed (%x)\n", ivtv_use_pio(s) ? "PIO" : "DMA",
237 s->name, s->dma_offset);
238 list_for_each(p, &s->q_dma.list) {
239 buf = list_entry(p, struct ivtv_buffer, list);
240 u32buf = (__le32 *)buf->buf;
241
242 /* Sync Buffer */
243 ivtv_buf_sync_for_cpu(s, buf);
244
245 if (x == 0 && ivtv_use_dma(s)) {
246 offset = s->dma_last_offset;
247 if (u32buf[offset / 4] != DMA_MAGIC_COOKIE)
248 {
249 for (offset = 0; offset < 64; offset++) {
250 if (u32buf[offset] == DMA_MAGIC_COOKIE) {
251 break;
252 }
253 }
254 offset *= 4;
255 if (offset == 256) {
256 IVTV_DEBUG_WARN("%s: Couldn't find start of buffer within the first 256 bytes\n", s->name);
257 offset = s->dma_last_offset;
258 }
259 if (s->dma_last_offset != offset)
260 IVTV_DEBUG_WARN("%s: offset %d -> %d\n", s->name, s->dma_last_offset, offset);
261 s->dma_last_offset = offset;
262 }
263 if (itv->has_cx23415 && (s->type == IVTV_ENC_STREAM_TYPE_PCM ||
264 s->type == IVTV_DEC_STREAM_TYPE_VBI)) {
265 write_dec_sync(0, s->dma_offset - IVTV_DECODER_OFFSET);
266 }
267 else {
268 write_enc_sync(0, s->dma_offset);
269 }
270 if (offset) {
271 buf->bytesused -= offset;
272 memcpy(buf->buf, buf->buf + offset, buf->bytesused + offset);
273 }
274 *u32buf = cpu_to_le32(s->dma_backup);
275 }
276 x++;
277 /* flag byteswap ABCD -> DCBA for MPG & VBI data outside irq */
278 if (s->type == IVTV_ENC_STREAM_TYPE_MPG ||
279 s->type == IVTV_ENC_STREAM_TYPE_VBI)
280 buf->b_flags |= IVTV_F_B_NEED_BUF_SWAP;
281 }
282 if (buf)
283 buf->bytesused += s->dma_last_offset;
284 if (buf && s->type == IVTV_DEC_STREAM_TYPE_VBI) {
285 list_for_each_entry(buf, &s->q_dma.list, list) {
286 /* Parse and Groom VBI Data */
287 s->q_dma.bytesused -= buf->bytesused;
288 ivtv_process_vbi_data(itv, buf, 0, s->type);
289 s->q_dma.bytesused += buf->bytesused;
290 }
291 if (s->fh == NULL) {
292 ivtv_queue_move(s, &s->q_dma, NULL, &s->q_free, 0);
293 return;
294 }
295 }
296 ivtv_queue_move(s, &s->q_dma, NULL, &s->q_full, s->q_dma.bytesused);
297 if (s->fh)
298 wake_up(&s->waitq);
299 }
300
ivtv_dma_stream_dec_prepare(struct ivtv_stream * s,u32 offset,int lock)301 void ivtv_dma_stream_dec_prepare(struct ivtv_stream *s, u32 offset, int lock)
302 {
303 struct ivtv *itv = s->itv;
304 struct yuv_playback_info *yi = &itv->yuv_info;
305 u8 frame = yi->draw_frame;
306 struct yuv_frame_info *f = &yi->new_frame_info[frame];
307 struct ivtv_buffer *buf;
308 u32 y_size = 720 * ((f->src_h + 31) & ~31);
309 u32 uv_offset = offset + IVTV_YUV_BUFFER_UV_OFFSET;
310 int y_done = 0;
311 int bytes_written = 0;
312 unsigned long flags = 0;
313 int idx = 0;
314
315 IVTV_DEBUG_HI_DMA("DEC PREPARE DMA %s: %08x %08x\n", s->name, s->q_predma.bytesused, offset);
316
317 /* Insert buffer block for YUV if needed */
318 if (s->type == IVTV_DEC_STREAM_TYPE_YUV && f->offset_y) {
319 if (yi->blanking_dmaptr) {
320 s->sg_pending[idx].src = yi->blanking_dmaptr;
321 s->sg_pending[idx].dst = offset;
322 s->sg_pending[idx].size = 720 * 16;
323 }
324 offset += 720 * 16;
325 idx++;
326 }
327
328 list_for_each_entry(buf, &s->q_predma.list, list) {
329 /* YUV UV Offset from Y Buffer */
330 if (s->type == IVTV_DEC_STREAM_TYPE_YUV && !y_done &&
331 (bytes_written + buf->bytesused) >= y_size) {
332 s->sg_pending[idx].src = buf->dma_handle;
333 s->sg_pending[idx].dst = offset;
334 s->sg_pending[idx].size = y_size - bytes_written;
335 offset = uv_offset;
336 if (s->sg_pending[idx].size != buf->bytesused) {
337 idx++;
338 s->sg_pending[idx].src =
339 buf->dma_handle + s->sg_pending[idx - 1].size;
340 s->sg_pending[idx].dst = offset;
341 s->sg_pending[idx].size =
342 buf->bytesused - s->sg_pending[idx - 1].size;
343 offset += s->sg_pending[idx].size;
344 }
345 y_done = 1;
346 } else {
347 s->sg_pending[idx].src = buf->dma_handle;
348 s->sg_pending[idx].dst = offset;
349 s->sg_pending[idx].size = buf->bytesused;
350 offset += buf->bytesused;
351 }
352 bytes_written += buf->bytesused;
353
354 /* Sync SG buffers */
355 ivtv_buf_sync_for_device(s, buf);
356 idx++;
357 }
358 s->sg_pending_size = idx;
359
360 /* Sync Hardware SG List of buffers */
361 ivtv_stream_sync_for_device(s);
362 if (lock)
363 spin_lock_irqsave(&itv->dma_reg_lock, flags);
364 if (!test_bit(IVTV_F_I_DMA, &itv->i_flags)) {
365 ivtv_dma_dec_start(s);
366 }
367 else {
368 set_bit(IVTV_F_S_DMA_PENDING, &s->s_flags);
369 }
370 if (lock)
371 spin_unlock_irqrestore(&itv->dma_reg_lock, flags);
372 }
373
ivtv_dma_enc_start_xfer(struct ivtv_stream * s)374 static void ivtv_dma_enc_start_xfer(struct ivtv_stream *s)
375 {
376 struct ivtv *itv = s->itv;
377
378 s->sg_dma->src = cpu_to_le32(s->sg_processing[s->sg_processed].src);
379 s->sg_dma->dst = cpu_to_le32(s->sg_processing[s->sg_processed].dst);
380 s->sg_dma->size = cpu_to_le32(s->sg_processing[s->sg_processed].size | 0x80000000);
381 s->sg_processed++;
382 /* Sync Hardware SG List of buffers */
383 ivtv_stream_sync_for_device(s);
384 write_reg(s->sg_handle, IVTV_REG_ENCDMAADDR);
385 write_reg_sync(read_reg(IVTV_REG_DMAXFER) | 0x02, IVTV_REG_DMAXFER);
386 itv->dma_timer.expires = jiffies + msecs_to_jiffies(300);
387 add_timer(&itv->dma_timer);
388 }
389
ivtv_dma_dec_start_xfer(struct ivtv_stream * s)390 static void ivtv_dma_dec_start_xfer(struct ivtv_stream *s)
391 {
392 struct ivtv *itv = s->itv;
393
394 s->sg_dma->src = cpu_to_le32(s->sg_processing[s->sg_processed].src);
395 s->sg_dma->dst = cpu_to_le32(s->sg_processing[s->sg_processed].dst);
396 s->sg_dma->size = cpu_to_le32(s->sg_processing[s->sg_processed].size | 0x80000000);
397 s->sg_processed++;
398 /* Sync Hardware SG List of buffers */
399 ivtv_stream_sync_for_device(s);
400 write_reg(s->sg_handle, IVTV_REG_DECDMAADDR);
401 write_reg_sync(read_reg(IVTV_REG_DMAXFER) | 0x01, IVTV_REG_DMAXFER);
402 itv->dma_timer.expires = jiffies + msecs_to_jiffies(300);
403 add_timer(&itv->dma_timer);
404 }
405
406 /* start the encoder DMA */
ivtv_dma_enc_start(struct ivtv_stream * s)407 static void ivtv_dma_enc_start(struct ivtv_stream *s)
408 {
409 struct ivtv *itv = s->itv;
410 struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
411 int i;
412
413 IVTV_DEBUG_HI_DMA("start %s for %s\n", ivtv_use_dma(s) ? "DMA" : "PIO", s->name);
414
415 if (s->q_predma.bytesused)
416 ivtv_queue_move(s, &s->q_predma, NULL, &s->q_dma, s->q_predma.bytesused);
417
418 if (ivtv_use_dma(s))
419 s->sg_pending[s->sg_pending_size - 1].size += 256;
420
421 /* If this is an MPEG stream, and VBI data is also pending, then append the
422 VBI DMA to the MPEG DMA and transfer both sets of data at once.
423
424 VBI DMA is a second class citizen compared to MPEG and mixing them together
425 will confuse the firmware (the end of a VBI DMA is seen as the end of a
426 MPEG DMA, thus effectively dropping an MPEG frame). So instead we make
427 sure we only use the MPEG DMA to transfer the VBI DMA if both are in
428 use. This way no conflicts occur. */
429 clear_bit(IVTV_F_S_DMA_HAS_VBI, &s->s_flags);
430 if (s->type == IVTV_ENC_STREAM_TYPE_MPG && s_vbi->sg_pending_size &&
431 s->sg_pending_size + s_vbi->sg_pending_size <= s->buffers) {
432 ivtv_queue_move(s_vbi, &s_vbi->q_predma, NULL, &s_vbi->q_dma, s_vbi->q_predma.bytesused);
433 if (ivtv_use_dma(s_vbi))
434 s_vbi->sg_pending[s_vbi->sg_pending_size - 1].size += 256;
435 for (i = 0; i < s_vbi->sg_pending_size; i++) {
436 s->sg_pending[s->sg_pending_size++] = s_vbi->sg_pending[i];
437 }
438 s_vbi->dma_offset = s_vbi->pending_offset;
439 s_vbi->sg_pending_size = 0;
440 s_vbi->dma_xfer_cnt++;
441 set_bit(IVTV_F_S_DMA_HAS_VBI, &s->s_flags);
442 IVTV_DEBUG_HI_DMA("include DMA for %s\n", s_vbi->name);
443 }
444
445 s->dma_xfer_cnt++;
446 memcpy(s->sg_processing, s->sg_pending, sizeof(struct ivtv_sg_host_element) * s->sg_pending_size);
447 s->sg_processing_size = s->sg_pending_size;
448 s->sg_pending_size = 0;
449 s->sg_processed = 0;
450 s->dma_offset = s->pending_offset;
451 s->dma_backup = s->pending_backup;
452 s->dma_pts = s->pending_pts;
453
454 if (ivtv_use_pio(s)) {
455 set_bit(IVTV_F_I_WORK_HANDLER_PIO, &itv->i_flags);
456 set_bit(IVTV_F_I_HAVE_WORK, &itv->i_flags);
457 set_bit(IVTV_F_I_PIO, &itv->i_flags);
458 itv->cur_pio_stream = s->type;
459 }
460 else {
461 itv->dma_retries = 0;
462 ivtv_dma_enc_start_xfer(s);
463 set_bit(IVTV_F_I_DMA, &itv->i_flags);
464 itv->cur_dma_stream = s->type;
465 }
466 }
467
ivtv_dma_dec_start(struct ivtv_stream * s)468 static void ivtv_dma_dec_start(struct ivtv_stream *s)
469 {
470 struct ivtv *itv = s->itv;
471
472 if (s->q_predma.bytesused)
473 ivtv_queue_move(s, &s->q_predma, NULL, &s->q_dma, s->q_predma.bytesused);
474 s->dma_xfer_cnt++;
475 memcpy(s->sg_processing, s->sg_pending, sizeof(struct ivtv_sg_host_element) * s->sg_pending_size);
476 s->sg_processing_size = s->sg_pending_size;
477 s->sg_pending_size = 0;
478 s->sg_processed = 0;
479
480 IVTV_DEBUG_HI_DMA("start DMA for %s\n", s->name);
481 itv->dma_retries = 0;
482 ivtv_dma_dec_start_xfer(s);
483 set_bit(IVTV_F_I_DMA, &itv->i_flags);
484 itv->cur_dma_stream = s->type;
485 }
486
ivtv_irq_dma_read(struct ivtv * itv)487 static void ivtv_irq_dma_read(struct ivtv *itv)
488 {
489 struct ivtv_stream *s = NULL;
490 struct ivtv_buffer *buf;
491 int hw_stream_type = 0;
492
493 IVTV_DEBUG_HI_IRQ("DEC DMA READ\n");
494
495 del_timer(&itv->dma_timer);
496
497 if (!test_bit(IVTV_F_I_UDMA, &itv->i_flags) && itv->cur_dma_stream < 0)
498 return;
499
500 if (!test_bit(IVTV_F_I_UDMA, &itv->i_flags)) {
501 s = &itv->streams[itv->cur_dma_stream];
502 ivtv_stream_sync_for_cpu(s);
503
504 if (read_reg(IVTV_REG_DMASTATUS) & 0x14) {
505 IVTV_DEBUG_WARN("DEC DMA ERROR %x (xfer %d of %d, retry %d)\n",
506 read_reg(IVTV_REG_DMASTATUS),
507 s->sg_processed, s->sg_processing_size, itv->dma_retries);
508 write_reg(read_reg(IVTV_REG_DMASTATUS) & 3, IVTV_REG_DMASTATUS);
509 if (itv->dma_retries == 3) {
510 /* Too many retries, give up on this frame */
511 itv->dma_retries = 0;
512 s->sg_processed = s->sg_processing_size;
513 }
514 else {
515 /* Retry, starting with the first xfer segment.
516 Just retrying the current segment is not sufficient. */
517 s->sg_processed = 0;
518 itv->dma_retries++;
519 }
520 }
521 if (s->sg_processed < s->sg_processing_size) {
522 /* DMA next buffer */
523 ivtv_dma_dec_start_xfer(s);
524 return;
525 }
526 if (s->type == IVTV_DEC_STREAM_TYPE_YUV)
527 hw_stream_type = 2;
528 IVTV_DEBUG_HI_DMA("DEC DATA READ %s: %d\n", s->name, s->q_dma.bytesused);
529
530 /* For some reason must kick the firmware, like PIO mode,
531 I think this tells the firmware we are done and the size
532 of the xfer so it can calculate what we need next.
533 I think we can do this part ourselves but would have to
534 fully calculate xfer info ourselves and not use interrupts
535 */
536 ivtv_vapi(itv, CX2341X_DEC_SCHED_DMA_FROM_HOST, 3, 0, s->q_dma.bytesused,
537 hw_stream_type);
538
539 /* Free last DMA call */
540 while ((buf = ivtv_dequeue(s, &s->q_dma)) != NULL) {
541 ivtv_buf_sync_for_cpu(s, buf);
542 ivtv_enqueue(s, buf, &s->q_free);
543 }
544 wake_up(&s->waitq);
545 }
546 clear_bit(IVTV_F_I_UDMA, &itv->i_flags);
547 clear_bit(IVTV_F_I_DMA, &itv->i_flags);
548 itv->cur_dma_stream = -1;
549 wake_up(&itv->dma_waitq);
550 }
551
ivtv_irq_enc_dma_complete(struct ivtv * itv)552 static void ivtv_irq_enc_dma_complete(struct ivtv *itv)
553 {
554 u32 data[CX2341X_MBOX_MAX_DATA];
555 struct ivtv_stream *s;
556
557 ivtv_api_get_data(&itv->enc_mbox, IVTV_MBOX_DMA_END, 2, data);
558 IVTV_DEBUG_HI_IRQ("ENC DMA COMPLETE %x %d (%d)\n", data[0], data[1], itv->cur_dma_stream);
559
560 del_timer(&itv->dma_timer);
561
562 if (itv->cur_dma_stream < 0)
563 return;
564
565 s = &itv->streams[itv->cur_dma_stream];
566 ivtv_stream_sync_for_cpu(s);
567
568 if (data[0] & 0x18) {
569 IVTV_DEBUG_WARN("ENC DMA ERROR %x (offset %08x, xfer %d of %d, retry %d)\n", data[0],
570 s->dma_offset, s->sg_processed, s->sg_processing_size, itv->dma_retries);
571 write_reg(read_reg(IVTV_REG_DMASTATUS) & 3, IVTV_REG_DMASTATUS);
572 if (itv->dma_retries == 3) {
573 /* Too many retries, give up on this frame */
574 itv->dma_retries = 0;
575 s->sg_processed = s->sg_processing_size;
576 }
577 else {
578 /* Retry, starting with the first xfer segment.
579 Just retrying the current segment is not sufficient. */
580 s->sg_processed = 0;
581 itv->dma_retries++;
582 }
583 }
584 if (s->sg_processed < s->sg_processing_size) {
585 /* DMA next buffer */
586 ivtv_dma_enc_start_xfer(s);
587 return;
588 }
589 clear_bit(IVTV_F_I_DMA, &itv->i_flags);
590 itv->cur_dma_stream = -1;
591 dma_post(s);
592 if (test_and_clear_bit(IVTV_F_S_DMA_HAS_VBI, &s->s_flags)) {
593 s = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
594 dma_post(s);
595 }
596 s->sg_processing_size = 0;
597 s->sg_processed = 0;
598 wake_up(&itv->dma_waitq);
599 }
600
ivtv_irq_enc_pio_complete(struct ivtv * itv)601 static void ivtv_irq_enc_pio_complete(struct ivtv *itv)
602 {
603 struct ivtv_stream *s;
604
605 if (itv->cur_pio_stream < 0 || itv->cur_pio_stream >= IVTV_MAX_STREAMS) {
606 itv->cur_pio_stream = -1;
607 return;
608 }
609 s = &itv->streams[itv->cur_pio_stream];
610 IVTV_DEBUG_HI_IRQ("ENC PIO COMPLETE %s\n", s->name);
611 clear_bit(IVTV_F_I_PIO, &itv->i_flags);
612 itv->cur_pio_stream = -1;
613 dma_post(s);
614 if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
615 ivtv_vapi(itv, CX2341X_ENC_SCHED_DMA_TO_HOST, 3, 0, 0, 0);
616 else if (s->type == IVTV_ENC_STREAM_TYPE_YUV)
617 ivtv_vapi(itv, CX2341X_ENC_SCHED_DMA_TO_HOST, 3, 0, 0, 1);
618 else if (s->type == IVTV_ENC_STREAM_TYPE_PCM)
619 ivtv_vapi(itv, CX2341X_ENC_SCHED_DMA_TO_HOST, 3, 0, 0, 2);
620 clear_bit(IVTV_F_I_PIO, &itv->i_flags);
621 if (test_and_clear_bit(IVTV_F_S_DMA_HAS_VBI, &s->s_flags)) {
622 s = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
623 dma_post(s);
624 }
625 wake_up(&itv->dma_waitq);
626 }
627
ivtv_irq_dma_err(struct ivtv * itv)628 static void ivtv_irq_dma_err(struct ivtv *itv)
629 {
630 u32 data[CX2341X_MBOX_MAX_DATA];
631 u32 status;
632
633 del_timer(&itv->dma_timer);
634
635 ivtv_api_get_data(&itv->enc_mbox, IVTV_MBOX_DMA_END, 2, data);
636 status = read_reg(IVTV_REG_DMASTATUS);
637 IVTV_DEBUG_WARN("DMA ERROR %08x %08x %08x %d\n", data[0], data[1],
638 status, itv->cur_dma_stream);
639 /*
640 * We do *not* write back to the IVTV_REG_DMASTATUS register to
641 * clear the error status, if either the encoder write (0x02) or
642 * decoder read (0x01) bus master DMA operation do not indicate
643 * completed. We can race with the DMA engine, which may have
644 * transitioned to completed status *after* we read the register.
645 * Setting a IVTV_REG_DMASTATUS flag back to "busy" status, after the
646 * DMA engine has completed, will cause the DMA engine to stop working.
647 */
648 status &= 0x3;
649 if (status == 0x3)
650 write_reg(status, IVTV_REG_DMASTATUS);
651
652 if (!test_bit(IVTV_F_I_UDMA, &itv->i_flags) &&
653 itv->cur_dma_stream >= 0 && itv->cur_dma_stream < IVTV_MAX_STREAMS) {
654 struct ivtv_stream *s = &itv->streams[itv->cur_dma_stream];
655
656 if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
657 /* retry */
658 /*
659 * FIXME - handle cases of DMA error similar to
660 * encoder below, except conditioned on status & 0x1
661 */
662 ivtv_dma_dec_start(s);
663 return;
664 } else {
665 if ((status & 0x2) == 0) {
666 /*
667 * CX2341x Bus Master DMA write is ongoing.
668 * Reset the timer and let it complete.
669 */
670 itv->dma_timer.expires =
671 jiffies + msecs_to_jiffies(600);
672 add_timer(&itv->dma_timer);
673 return;
674 }
675
676 if (itv->dma_retries < 3) {
677 /*
678 * CX2341x Bus Master DMA write has ended.
679 * Retry the write, starting with the first
680 * xfer segment. Just retrying the current
681 * segment is not sufficient.
682 */
683 s->sg_processed = 0;
684 itv->dma_retries++;
685 ivtv_dma_enc_start_xfer(s);
686 return;
687 }
688 /* Too many retries, give up on this one */
689 }
690
691 }
692 if (test_bit(IVTV_F_I_UDMA, &itv->i_flags)) {
693 ivtv_udma_start(itv);
694 return;
695 }
696 clear_bit(IVTV_F_I_UDMA, &itv->i_flags);
697 clear_bit(IVTV_F_I_DMA, &itv->i_flags);
698 itv->cur_dma_stream = -1;
699 wake_up(&itv->dma_waitq);
700 }
701
ivtv_irq_enc_start_cap(struct ivtv * itv)702 static void ivtv_irq_enc_start_cap(struct ivtv *itv)
703 {
704 u32 data[CX2341X_MBOX_MAX_DATA];
705 struct ivtv_stream *s;
706
707 /* Get DMA destination and size arguments from card */
708 ivtv_api_get_data(&itv->enc_mbox, IVTV_MBOX_DMA, 7, data);
709 IVTV_DEBUG_HI_IRQ("ENC START CAP %d: %08x %08x\n", data[0], data[1], data[2]);
710
711 if (data[0] > 2 || data[1] == 0 || data[2] == 0) {
712 IVTV_DEBUG_WARN("Unknown input: %08x %08x %08x\n",
713 data[0], data[1], data[2]);
714 return;
715 }
716 s = &itv->streams[ivtv_stream_map[data[0]]];
717 if (!stream_enc_dma_append(s, data)) {
718 set_bit(ivtv_use_pio(s) ? IVTV_F_S_PIO_PENDING : IVTV_F_S_DMA_PENDING, &s->s_flags);
719 }
720 }
721
ivtv_irq_enc_vbi_cap(struct ivtv * itv)722 static void ivtv_irq_enc_vbi_cap(struct ivtv *itv)
723 {
724 u32 data[CX2341X_MBOX_MAX_DATA];
725 struct ivtv_stream *s;
726
727 IVTV_DEBUG_HI_IRQ("ENC START VBI CAP\n");
728 s = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
729
730 if (!stream_enc_dma_append(s, data))
731 set_bit(ivtv_use_pio(s) ? IVTV_F_S_PIO_PENDING : IVTV_F_S_DMA_PENDING, &s->s_flags);
732 }
733
ivtv_irq_dec_vbi_reinsert(struct ivtv * itv)734 static void ivtv_irq_dec_vbi_reinsert(struct ivtv *itv)
735 {
736 u32 data[CX2341X_MBOX_MAX_DATA];
737 struct ivtv_stream *s = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI];
738
739 IVTV_DEBUG_HI_IRQ("DEC VBI REINSERT\n");
740 if (test_bit(IVTV_F_S_CLAIMED, &s->s_flags) &&
741 !stream_enc_dma_append(s, data)) {
742 set_bit(IVTV_F_S_PIO_PENDING, &s->s_flags);
743 }
744 }
745
ivtv_irq_dec_data_req(struct ivtv * itv)746 static void ivtv_irq_dec_data_req(struct ivtv *itv)
747 {
748 u32 data[CX2341X_MBOX_MAX_DATA];
749 struct ivtv_stream *s;
750
751 /* YUV or MPG */
752
753 if (test_bit(IVTV_F_I_DEC_YUV, &itv->i_flags)) {
754 ivtv_api_get_data(&itv->dec_mbox, IVTV_MBOX_DMA, 2, data);
755 itv->dma_data_req_size =
756 1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31);
757 itv->dma_data_req_offset = data[1];
758 if (atomic_read(&itv->yuv_info.next_dma_frame) >= 0)
759 ivtv_yuv_frame_complete(itv);
760 s = &itv->streams[IVTV_DEC_STREAM_TYPE_YUV];
761 }
762 else {
763 ivtv_api_get_data(&itv->dec_mbox, IVTV_MBOX_DMA, 3, data);
764 itv->dma_data_req_size = min_t(u32, data[2], 0x10000);
765 itv->dma_data_req_offset = data[1];
766 s = &itv->streams[IVTV_DEC_STREAM_TYPE_MPG];
767 }
768 IVTV_DEBUG_HI_IRQ("DEC DATA REQ %s: %d %08x %u\n", s->name, s->q_full.bytesused,
769 itv->dma_data_req_offset, itv->dma_data_req_size);
770 if (itv->dma_data_req_size == 0 || s->q_full.bytesused < itv->dma_data_req_size) {
771 set_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
772 }
773 else {
774 if (test_bit(IVTV_F_I_DEC_YUV, &itv->i_flags))
775 ivtv_yuv_setup_stream_frame(itv);
776 clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
777 ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
778 ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 0);
779 }
780 }
781
ivtv_irq_vsync(struct ivtv * itv)782 static void ivtv_irq_vsync(struct ivtv *itv)
783 {
784 /* The vsync interrupt is unusual in that it won't clear until
785 * the end of the first line for the current field, at which
786 * point it clears itself. This can result in repeated vsync
787 * interrupts, or a missed vsync. Read some of the registers
788 * to determine the line being displayed and ensure we handle
789 * one vsync per frame.
790 */
791 unsigned int frame = read_reg(IVTV_REG_DEC_LINE_FIELD) & 1;
792 struct yuv_playback_info *yi = &itv->yuv_info;
793 int last_dma_frame = atomic_read(&yi->next_dma_frame);
794 struct yuv_frame_info *f = &yi->new_frame_info[last_dma_frame];
795
796 if (0) IVTV_DEBUG_IRQ("DEC VSYNC\n");
797
798 if (((frame ^ f->sync_field) == 0 &&
799 ((itv->last_vsync_field & 1) ^ f->sync_field)) ||
800 (frame != (itv->last_vsync_field & 1) && !f->interlaced)) {
801 int next_dma_frame = last_dma_frame;
802
803 if (!(f->interlaced && f->delay && yi->fields_lapsed < 1)) {
804 if (next_dma_frame >= 0 && next_dma_frame != atomic_read(&yi->next_fill_frame)) {
805 write_reg(yuv_offset[next_dma_frame] >> 4, 0x82c);
806 write_reg((yuv_offset[next_dma_frame] + IVTV_YUV_BUFFER_UV_OFFSET) >> 4, 0x830);
807 write_reg(yuv_offset[next_dma_frame] >> 4, 0x834);
808 write_reg((yuv_offset[next_dma_frame] + IVTV_YUV_BUFFER_UV_OFFSET) >> 4, 0x838);
809 next_dma_frame = (next_dma_frame + 1) % IVTV_YUV_BUFFERS;
810 atomic_set(&yi->next_dma_frame, next_dma_frame);
811 yi->fields_lapsed = -1;
812 yi->running = 1;
813 }
814 }
815 }
816 if (frame != (itv->last_vsync_field & 1)) {
817 static const struct v4l2_event evtop = {
818 .type = V4L2_EVENT_VSYNC,
819 .u.vsync.field = V4L2_FIELD_TOP,
820 };
821 static const struct v4l2_event evbottom = {
822 .type = V4L2_EVENT_VSYNC,
823 .u.vsync.field = V4L2_FIELD_BOTTOM,
824 };
825 struct ivtv_stream *s = ivtv_get_output_stream(itv);
826
827 itv->last_vsync_field += 1;
828 if (frame == 0) {
829 clear_bit(IVTV_F_I_VALID_DEC_TIMINGS, &itv->i_flags);
830 clear_bit(IVTV_F_I_EV_VSYNC_FIELD, &itv->i_flags);
831 }
832 else {
833 set_bit(IVTV_F_I_EV_VSYNC_FIELD, &itv->i_flags);
834 }
835 if (test_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags)) {
836 set_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags);
837 wake_up(&itv->event_waitq);
838 if (s)
839 wake_up(&s->waitq);
840 }
841 if (s && s->vdev)
842 v4l2_event_queue(s->vdev, frame ? &evtop : &evbottom);
843 wake_up(&itv->vsync_waitq);
844
845 /* Send VBI to saa7127 */
846 if (frame && (itv->output_mode == OUT_PASSTHROUGH ||
847 test_bit(IVTV_F_I_UPDATE_WSS, &itv->i_flags) ||
848 test_bit(IVTV_F_I_UPDATE_VPS, &itv->i_flags) ||
849 test_bit(IVTV_F_I_UPDATE_CC, &itv->i_flags))) {
850 set_bit(IVTV_F_I_WORK_HANDLER_VBI, &itv->i_flags);
851 set_bit(IVTV_F_I_HAVE_WORK, &itv->i_flags);
852 }
853
854 /* Check if we need to update the yuv registers */
855 if (yi->running && (yi->yuv_forced_update || f->update)) {
856 if (!f->update) {
857 last_dma_frame =
858 (u8)(atomic_read(&yi->next_dma_frame) -
859 1) % IVTV_YUV_BUFFERS;
860 f = &yi->new_frame_info[last_dma_frame];
861 }
862
863 if (f->src_w) {
864 yi->update_frame = last_dma_frame;
865 f->update = 0;
866 yi->yuv_forced_update = 0;
867 set_bit(IVTV_F_I_WORK_HANDLER_YUV, &itv->i_flags);
868 set_bit(IVTV_F_I_HAVE_WORK, &itv->i_flags);
869 }
870 }
871
872 yi->fields_lapsed++;
873 }
874 }
875
876 #define IVTV_IRQ_DMA (IVTV_IRQ_DMA_READ | IVTV_IRQ_ENC_DMA_COMPLETE | IVTV_IRQ_DMA_ERR | IVTV_IRQ_ENC_START_CAP | IVTV_IRQ_ENC_VBI_CAP | IVTV_IRQ_DEC_DATA_REQ | IVTV_IRQ_DEC_VBI_RE_INSERT)
877
ivtv_irq_handler(int irq,void * dev_id)878 irqreturn_t ivtv_irq_handler(int irq, void *dev_id)
879 {
880 struct ivtv *itv = (struct ivtv *)dev_id;
881 u32 combo;
882 u32 stat;
883 int i;
884 u8 vsync_force = 0;
885
886 spin_lock(&itv->dma_reg_lock);
887 /* get contents of irq status register */
888 stat = read_reg(IVTV_REG_IRQSTATUS);
889
890 combo = ~itv->irqmask & stat;
891
892 /* Clear out IRQ */
893 if (combo) write_reg(combo, IVTV_REG_IRQSTATUS);
894
895 if (0 == combo) {
896 /* The vsync interrupt is unusual and clears itself. If we
897 * took too long, we may have missed it. Do some checks
898 */
899 if (~itv->irqmask & IVTV_IRQ_DEC_VSYNC) {
900 /* vsync is enabled, see if we're in a new field */
901 if ((itv->last_vsync_field & 1) !=
902 (read_reg(IVTV_REG_DEC_LINE_FIELD) & 1)) {
903 /* New field, looks like we missed it */
904 IVTV_DEBUG_YUV("VSync interrupt missed %d\n",
905 read_reg(IVTV_REG_DEC_LINE_FIELD) >> 16);
906 vsync_force = 1;
907 }
908 }
909
910 if (!vsync_force) {
911 /* No Vsync expected, wasn't for us */
912 spin_unlock(&itv->dma_reg_lock);
913 return IRQ_NONE;
914 }
915 }
916
917 /* Exclude interrupts noted below from the output, otherwise the log is flooded with
918 these messages */
919 if (combo & ~0xff6d0400)
920 IVTV_DEBUG_HI_IRQ("======= valid IRQ bits: 0x%08x ======\n", combo);
921
922 if (combo & IVTV_IRQ_DEC_DMA_COMPLETE) {
923 IVTV_DEBUG_HI_IRQ("DEC DMA COMPLETE\n");
924 }
925
926 if (combo & IVTV_IRQ_DMA_READ) {
927 ivtv_irq_dma_read(itv);
928 }
929
930 if (combo & IVTV_IRQ_ENC_DMA_COMPLETE) {
931 ivtv_irq_enc_dma_complete(itv);
932 }
933
934 if (combo & IVTV_IRQ_ENC_PIO_COMPLETE) {
935 ivtv_irq_enc_pio_complete(itv);
936 }
937
938 if (combo & IVTV_IRQ_DMA_ERR) {
939 ivtv_irq_dma_err(itv);
940 }
941
942 if (combo & IVTV_IRQ_ENC_START_CAP) {
943 ivtv_irq_enc_start_cap(itv);
944 }
945
946 if (combo & IVTV_IRQ_ENC_VBI_CAP) {
947 ivtv_irq_enc_vbi_cap(itv);
948 }
949
950 if (combo & IVTV_IRQ_DEC_VBI_RE_INSERT) {
951 ivtv_irq_dec_vbi_reinsert(itv);
952 }
953
954 if (combo & IVTV_IRQ_ENC_EOS) {
955 IVTV_DEBUG_IRQ("ENC EOS\n");
956 set_bit(IVTV_F_I_EOS, &itv->i_flags);
957 wake_up(&itv->eos_waitq);
958 }
959
960 if (combo & IVTV_IRQ_DEC_DATA_REQ) {
961 ivtv_irq_dec_data_req(itv);
962 }
963
964 /* Decoder Vertical Sync - We can't rely on 'combo', so check if vsync enabled */
965 if (~itv->irqmask & IVTV_IRQ_DEC_VSYNC) {
966 ivtv_irq_vsync(itv);
967 }
968
969 if (combo & IVTV_IRQ_ENC_VIM_RST) {
970 IVTV_DEBUG_IRQ("VIM RST\n");
971 /*ivtv_vapi(itv, CX2341X_ENC_REFRESH_INPUT, 0); */
972 }
973
974 if (combo & IVTV_IRQ_DEC_AUD_MODE_CHG) {
975 IVTV_DEBUG_INFO("Stereo mode changed\n");
976 }
977
978 if ((combo & IVTV_IRQ_DMA) && !test_bit(IVTV_F_I_DMA, &itv->i_flags)) {
979 itv->irq_rr_idx++;
980 for (i = 0; i < IVTV_MAX_STREAMS; i++) {
981 int idx = (i + itv->irq_rr_idx) % IVTV_MAX_STREAMS;
982 struct ivtv_stream *s = &itv->streams[idx];
983
984 if (!test_and_clear_bit(IVTV_F_S_DMA_PENDING, &s->s_flags))
985 continue;
986 if (s->type >= IVTV_DEC_STREAM_TYPE_MPG)
987 ivtv_dma_dec_start(s);
988 else
989 ivtv_dma_enc_start(s);
990 break;
991 }
992
993 if (i == IVTV_MAX_STREAMS &&
994 test_bit(IVTV_F_I_UDMA_PENDING, &itv->i_flags))
995 ivtv_udma_start(itv);
996 }
997
998 if ((combo & IVTV_IRQ_DMA) && !test_bit(IVTV_F_I_PIO, &itv->i_flags)) {
999 itv->irq_rr_idx++;
1000 for (i = 0; i < IVTV_MAX_STREAMS; i++) {
1001 int idx = (i + itv->irq_rr_idx) % IVTV_MAX_STREAMS;
1002 struct ivtv_stream *s = &itv->streams[idx];
1003
1004 if (!test_and_clear_bit(IVTV_F_S_PIO_PENDING, &s->s_flags))
1005 continue;
1006 if (s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type < IVTV_DEC_STREAM_TYPE_MPG)
1007 ivtv_dma_enc_start(s);
1008 break;
1009 }
1010 }
1011
1012 if (test_and_clear_bit(IVTV_F_I_HAVE_WORK, &itv->i_flags)) {
1013 queue_kthread_work(&itv->irq_worker, &itv->irq_work);
1014 }
1015
1016 spin_unlock(&itv->dma_reg_lock);
1017
1018 /* If we've just handled a 'forced' vsync, it's safest to say it
1019 * wasn't ours. Another device may have triggered it at just
1020 * the right time.
1021 */
1022 return vsync_force ? IRQ_NONE : IRQ_HANDLED;
1023 }
1024
ivtv_unfinished_dma(unsigned long arg)1025 void ivtv_unfinished_dma(unsigned long arg)
1026 {
1027 struct ivtv *itv = (struct ivtv *)arg;
1028
1029 if (!test_bit(IVTV_F_I_DMA, &itv->i_flags))
1030 return;
1031 IVTV_ERR("DMA TIMEOUT %08x %d\n", read_reg(IVTV_REG_DMASTATUS), itv->cur_dma_stream);
1032
1033 write_reg(read_reg(IVTV_REG_DMASTATUS) & 3, IVTV_REG_DMASTATUS);
1034 clear_bit(IVTV_F_I_UDMA, &itv->i_flags);
1035 clear_bit(IVTV_F_I_DMA, &itv->i_flags);
1036 itv->cur_dma_stream = -1;
1037 wake_up(&itv->dma_waitq);
1038 }
1039