diff options
Diffstat (limited to 'sound/oss/dmabuf.c')
-rw-r--r-- | sound/oss/dmabuf.c | 1298 |
1 files changed, 1298 insertions, 0 deletions
diff --git a/sound/oss/dmabuf.c b/sound/oss/dmabuf.c new file mode 100644 index 000000000000..baf4244a54f2 --- /dev/null +++ b/sound/oss/dmabuf.c | |||
@@ -0,0 +1,1298 @@ | |||
1 | /* | ||
2 | * sound/dmabuf.c | ||
3 | * | ||
4 | * The DMA buffer manager for digitized voice applications | ||
5 | */ | ||
6 | /* | ||
7 | * Copyright (C) by Hannu Savolainen 1993-1997 | ||
8 | * | ||
9 | * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL) | ||
10 | * Version 2 (June 1991). See the "COPYING" file distributed with this software | ||
11 | * for more info. | ||
12 | * | ||
13 | * Thomas Sailer : moved several static variables into struct audio_operations | ||
14 | * (which is grossly misnamed btw.) because they have the same | ||
15 | * lifetime as the rest in there and dynamic allocation saves | ||
16 | * 12k or so | ||
17 | * Thomas Sailer : remove {in,out}_sleep_flag. It was used for the sleeper to | ||
18 | * determine if it was woken up by the expiring timeout or by | ||
19 | * an explicit wake_up. The return value from schedule_timeout | ||
20 | * can be used instead; if 0, the wakeup was due to the timeout. | ||
21 | * | ||
22 | * Rob Riggs Added persistent DMA buffers (1998/10/17) | ||
23 | */ | ||
24 | |||
25 | #define BE_CONSERVATIVE | ||
26 | #define SAMPLE_ROUNDUP 0 | ||
27 | |||
28 | #include "sound_config.h" | ||
29 | |||
30 | #define DMAP_FREE_ON_CLOSE 0 | ||
31 | #define DMAP_KEEP_ON_CLOSE 1 | ||
32 | extern int sound_dmap_flag; | ||
33 | |||
34 | static void dma_reset_output(int dev); | ||
35 | static void dma_reset_input(int dev); | ||
36 | static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode); | ||
37 | |||
38 | |||
39 | |||
40 | static int debugmem; /* switched off by default */ | ||
41 | static int dma_buffsize = DSP_BUFFSIZE; | ||
42 | |||
43 | static long dmabuf_timeout(struct dma_buffparms *dmap) | ||
44 | { | ||
45 | long tmout; | ||
46 | |||
47 | tmout = (dmap->fragment_size * HZ) / dmap->data_rate; | ||
48 | tmout += HZ / 5; /* Some safety distance */ | ||
49 | if (tmout < (HZ / 2)) | ||
50 | tmout = HZ / 2; | ||
51 | if (tmout > 20 * HZ) | ||
52 | tmout = 20 * HZ; | ||
53 | return tmout; | ||
54 | } | ||
55 | |||
56 | static int sound_alloc_dmap(struct dma_buffparms *dmap) | ||
57 | { | ||
58 | char *start_addr, *end_addr; | ||
59 | int dma_pagesize; | ||
60 | int sz, size; | ||
61 | struct page *page; | ||
62 | |||
63 | dmap->mapping_flags &= ~DMA_MAP_MAPPED; | ||
64 | |||
65 | if (dmap->raw_buf != NULL) | ||
66 | return 0; /* Already done */ | ||
67 | if (dma_buffsize < 4096) | ||
68 | dma_buffsize = 4096; | ||
69 | dma_pagesize = (dmap->dma < 4) ? (64 * 1024) : (128 * 1024); | ||
70 | |||
71 | /* | ||
72 | * Now check for the Cyrix problem. | ||
73 | */ | ||
74 | |||
75 | if(isa_dma_bridge_buggy==2) | ||
76 | dma_pagesize=32768; | ||
77 | |||
78 | dmap->raw_buf = NULL; | ||
79 | dmap->buffsize = dma_buffsize; | ||
80 | if (dmap->buffsize > dma_pagesize) | ||
81 | dmap->buffsize = dma_pagesize; | ||
82 | start_addr = NULL; | ||
83 | /* | ||
84 | * Now loop until we get a free buffer. Try to get smaller buffer if | ||
85 | * it fails. Don't accept smaller than 8k buffer for performance | ||
86 | * reasons. | ||
87 | */ | ||
88 | while (start_addr == NULL && dmap->buffsize > PAGE_SIZE) { | ||
89 | for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1); | ||
90 | dmap->buffsize = PAGE_SIZE * (1 << sz); | ||
91 | start_addr = (char *) __get_free_pages(GFP_ATOMIC|GFP_DMA|__GFP_NOWARN, sz); | ||
92 | if (start_addr == NULL) | ||
93 | dmap->buffsize /= 2; | ||
94 | } | ||
95 | |||
96 | if (start_addr == NULL) { | ||
97 | printk(KERN_WARNING "Sound error: Couldn't allocate DMA buffer\n"); | ||
98 | return -ENOMEM; | ||
99 | } else { | ||
100 | /* make some checks */ | ||
101 | end_addr = start_addr + dmap->buffsize - 1; | ||
102 | |||
103 | if (debugmem) | ||
104 | printk(KERN_DEBUG "sound: start 0x%lx, end 0x%lx\n", (long) start_addr, (long) end_addr); | ||
105 | |||
106 | /* now check if it fits into the same dma-pagesize */ | ||
107 | |||
108 | if (((long) start_addr & ~(dma_pagesize - 1)) != ((long) end_addr & ~(dma_pagesize - 1)) | ||
109 | || end_addr >= (char *) (MAX_DMA_ADDRESS)) { | ||
110 | printk(KERN_ERR "sound: Got invalid address 0x%lx for %db DMA-buffer\n", (long) start_addr, dmap->buffsize); | ||
111 | return -EFAULT; | ||
112 | } | ||
113 | } | ||
114 | dmap->raw_buf = start_addr; | ||
115 | dmap->raw_buf_phys = virt_to_bus(start_addr); | ||
116 | |||
117 | for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++) | ||
118 | SetPageReserved(page); | ||
119 | return 0; | ||
120 | } | ||
121 | |||
122 | static void sound_free_dmap(struct dma_buffparms *dmap) | ||
123 | { | ||
124 | int sz, size; | ||
125 | struct page *page; | ||
126 | unsigned long start_addr, end_addr; | ||
127 | |||
128 | if (dmap->raw_buf == NULL) | ||
129 | return; | ||
130 | if (dmap->mapping_flags & DMA_MAP_MAPPED) | ||
131 | return; /* Don't free mmapped buffer. Will use it next time */ | ||
132 | for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1); | ||
133 | |||
134 | start_addr = (unsigned long) dmap->raw_buf; | ||
135 | end_addr = start_addr + dmap->buffsize; | ||
136 | |||
137 | for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++) | ||
138 | ClearPageReserved(page); | ||
139 | |||
140 | free_pages((unsigned long) dmap->raw_buf, sz); | ||
141 | dmap->raw_buf = NULL; | ||
142 | } | ||
143 | |||
144 | |||
145 | /* Intel version !!!!!!!!! */ | ||
146 | |||
147 | static int sound_start_dma(struct dma_buffparms *dmap, unsigned long physaddr, int count, int dma_mode) | ||
148 | { | ||
149 | unsigned long flags; | ||
150 | int chan = dmap->dma; | ||
151 | |||
152 | /* printk( "Start DMA%d %d, %d\n", chan, (int)(physaddr-dmap->raw_buf_phys), count); */ | ||
153 | |||
154 | flags = claim_dma_lock(); | ||
155 | disable_dma(chan); | ||
156 | clear_dma_ff(chan); | ||
157 | set_dma_mode(chan, dma_mode); | ||
158 | set_dma_addr(chan, physaddr); | ||
159 | set_dma_count(chan, count); | ||
160 | enable_dma(chan); | ||
161 | release_dma_lock(flags); | ||
162 | |||
163 | return 0; | ||
164 | } | ||
165 | |||
166 | static void dma_init_buffers(struct dma_buffparms *dmap) | ||
167 | { | ||
168 | dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0; | ||
169 | dmap->byte_counter = 0; | ||
170 | dmap->max_byte_counter = 8000 * 60 * 60; | ||
171 | dmap->bytes_in_use = dmap->buffsize; | ||
172 | |||
173 | dmap->dma_mode = DMODE_NONE; | ||
174 | dmap->mapping_flags = 0; | ||
175 | dmap->neutral_byte = 0x80; | ||
176 | dmap->data_rate = 8000; | ||
177 | dmap->cfrag = -1; | ||
178 | dmap->closing = 0; | ||
179 | dmap->nbufs = 1; | ||
180 | dmap->flags = DMA_BUSY; /* Other flags off */ | ||
181 | } | ||
182 | |||
183 | static int open_dmap(struct audio_operations *adev, int mode, struct dma_buffparms *dmap) | ||
184 | { | ||
185 | int err; | ||
186 | |||
187 | if (dmap->flags & DMA_BUSY) | ||
188 | return -EBUSY; | ||
189 | if ((err = sound_alloc_dmap(dmap)) < 0) | ||
190 | return err; | ||
191 | |||
192 | if (dmap->raw_buf == NULL) { | ||
193 | printk(KERN_WARNING "Sound: DMA buffers not available\n"); | ||
194 | return -ENOSPC; /* Memory allocation failed during boot */ | ||
195 | } | ||
196 | if (dmap->dma >= 0 && sound_open_dma(dmap->dma, adev->name)) { | ||
197 | printk(KERN_WARNING "Unable to grab(2) DMA%d for the audio driver\n", dmap->dma); | ||
198 | return -EBUSY; | ||
199 | } | ||
200 | dma_init_buffers(dmap); | ||
201 | spin_lock_init(&dmap->lock); | ||
202 | dmap->open_mode = mode; | ||
203 | dmap->subdivision = dmap->underrun_count = 0; | ||
204 | dmap->fragment_size = 0; | ||
205 | dmap->max_fragments = 65536; /* Just a large value */ | ||
206 | dmap->byte_counter = 0; | ||
207 | dmap->max_byte_counter = 8000 * 60 * 60; | ||
208 | dmap->applic_profile = APF_NORMAL; | ||
209 | dmap->needs_reorg = 1; | ||
210 | dmap->audio_callback = NULL; | ||
211 | dmap->callback_parm = 0; | ||
212 | return 0; | ||
213 | } | ||
214 | |||
215 | static void close_dmap(struct audio_operations *adev, struct dma_buffparms *dmap) | ||
216 | { | ||
217 | unsigned long flags; | ||
218 | |||
219 | if (dmap->dma >= 0) { | ||
220 | sound_close_dma(dmap->dma); | ||
221 | flags=claim_dma_lock(); | ||
222 | disable_dma(dmap->dma); | ||
223 | release_dma_lock(flags); | ||
224 | } | ||
225 | if (dmap->flags & DMA_BUSY) | ||
226 | dmap->dma_mode = DMODE_NONE; | ||
227 | dmap->flags &= ~DMA_BUSY; | ||
228 | |||
229 | if (sound_dmap_flag == DMAP_FREE_ON_CLOSE) | ||
230 | sound_free_dmap(dmap); | ||
231 | } | ||
232 | |||
233 | |||
234 | static unsigned int default_set_bits(int dev, unsigned int bits) | ||
235 | { | ||
236 | mm_segment_t fs = get_fs(); | ||
237 | |||
238 | set_fs(get_ds()); | ||
239 | audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SETFMT, (void __user *)&bits); | ||
240 | set_fs(fs); | ||
241 | return bits; | ||
242 | } | ||
243 | |||
244 | static int default_set_speed(int dev, int speed) | ||
245 | { | ||
246 | mm_segment_t fs = get_fs(); | ||
247 | |||
248 | set_fs(get_ds()); | ||
249 | audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SPEED, (void __user *)&speed); | ||
250 | set_fs(fs); | ||
251 | return speed; | ||
252 | } | ||
253 | |||
254 | static short default_set_channels(int dev, short channels) | ||
255 | { | ||
256 | int c = channels; | ||
257 | mm_segment_t fs = get_fs(); | ||
258 | |||
259 | set_fs(get_ds()); | ||
260 | audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_CHANNELS, (void __user *)&c); | ||
261 | set_fs(fs); | ||
262 | return c; | ||
263 | } | ||
264 | |||
265 | static void check_driver(struct audio_driver *d) | ||
266 | { | ||
267 | if (d->set_speed == NULL) | ||
268 | d->set_speed = default_set_speed; | ||
269 | if (d->set_bits == NULL) | ||
270 | d->set_bits = default_set_bits; | ||
271 | if (d->set_channels == NULL) | ||
272 | d->set_channels = default_set_channels; | ||
273 | } | ||
274 | |||
275 | int DMAbuf_open(int dev, int mode) | ||
276 | { | ||
277 | struct audio_operations *adev = audio_devs[dev]; | ||
278 | int retval; | ||
279 | struct dma_buffparms *dmap_in = NULL; | ||
280 | struct dma_buffparms *dmap_out = NULL; | ||
281 | |||
282 | if (!adev) | ||
283 | return -ENXIO; | ||
284 | if (!(adev->flags & DMA_DUPLEX)) | ||
285 | adev->dmap_in = adev->dmap_out; | ||
286 | check_driver(adev->d); | ||
287 | |||
288 | if ((retval = adev->d->open(dev, mode)) < 0) | ||
289 | return retval; | ||
290 | dmap_out = adev->dmap_out; | ||
291 | dmap_in = adev->dmap_in; | ||
292 | if (dmap_in == dmap_out) | ||
293 | adev->flags &= ~DMA_DUPLEX; | ||
294 | |||
295 | if (mode & OPEN_WRITE) { | ||
296 | if ((retval = open_dmap(adev, mode, dmap_out)) < 0) { | ||
297 | adev->d->close(dev); | ||
298 | return retval; | ||
299 | } | ||
300 | } | ||
301 | adev->enable_bits = mode; | ||
302 | |||
303 | if (mode == OPEN_READ || (mode != OPEN_WRITE && (adev->flags & DMA_DUPLEX))) { | ||
304 | if ((retval = open_dmap(adev, mode, dmap_in)) < 0) { | ||
305 | adev->d->close(dev); | ||
306 | if (mode & OPEN_WRITE) | ||
307 | close_dmap(adev, dmap_out); | ||
308 | return retval; | ||
309 | } | ||
310 | } | ||
311 | adev->open_mode = mode; | ||
312 | adev->go = 1; | ||
313 | |||
314 | adev->d->set_bits(dev, 8); | ||
315 | adev->d->set_channels(dev, 1); | ||
316 | adev->d->set_speed(dev, DSP_DEFAULT_SPEED); | ||
317 | if (adev->dmap_out->dma_mode == DMODE_OUTPUT) | ||
318 | memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte, | ||
319 | adev->dmap_out->bytes_in_use); | ||
320 | return 0; | ||
321 | } | ||
322 | /* MUST not hold the spinlock */ | ||
323 | void DMAbuf_reset(int dev) | ||
324 | { | ||
325 | if (audio_devs[dev]->open_mode & OPEN_WRITE) | ||
326 | dma_reset_output(dev); | ||
327 | |||
328 | if (audio_devs[dev]->open_mode & OPEN_READ) | ||
329 | dma_reset_input(dev); | ||
330 | } | ||
331 | |||
332 | static void dma_reset_output(int dev) | ||
333 | { | ||
334 | struct audio_operations *adev = audio_devs[dev]; | ||
335 | unsigned long flags,f ; | ||
336 | struct dma_buffparms *dmap = adev->dmap_out; | ||
337 | |||
338 | if (!(dmap->flags & DMA_STARTED)) /* DMA is not active */ | ||
339 | return; | ||
340 | |||
341 | /* | ||
342 | * First wait until the current fragment has been played completely | ||
343 | */ | ||
344 | spin_lock_irqsave(&dmap->lock,flags); | ||
345 | adev->dmap_out->flags |= DMA_SYNCING; | ||
346 | |||
347 | adev->dmap_out->underrun_count = 0; | ||
348 | if (!signal_pending(current) && adev->dmap_out->qlen && | ||
349 | adev->dmap_out->underrun_count == 0){ | ||
350 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
351 | interruptible_sleep_on_timeout(&adev->out_sleeper, | ||
352 | dmabuf_timeout(dmap)); | ||
353 | spin_lock_irqsave(&dmap->lock,flags); | ||
354 | } | ||
355 | adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE); | ||
356 | |||
357 | /* | ||
358 | * Finally shut the device off | ||
359 | */ | ||
360 | if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_output) | ||
361 | adev->d->halt_io(dev); | ||
362 | else | ||
363 | adev->d->halt_output(dev); | ||
364 | adev->dmap_out->flags &= ~DMA_STARTED; | ||
365 | |||
366 | f=claim_dma_lock(); | ||
367 | clear_dma_ff(dmap->dma); | ||
368 | disable_dma(dmap->dma); | ||
369 | release_dma_lock(f); | ||
370 | |||
371 | dmap->byte_counter = 0; | ||
372 | reorganize_buffers(dev, adev->dmap_out, 0); | ||
373 | dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0; | ||
374 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
375 | } | ||
376 | |||
377 | static void dma_reset_input(int dev) | ||
378 | { | ||
379 | struct audio_operations *adev = audio_devs[dev]; | ||
380 | unsigned long flags; | ||
381 | struct dma_buffparms *dmap = adev->dmap_in; | ||
382 | |||
383 | spin_lock_irqsave(&dmap->lock,flags); | ||
384 | if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_input) | ||
385 | adev->d->halt_io(dev); | ||
386 | else | ||
387 | adev->d->halt_input(dev); | ||
388 | adev->dmap_in->flags &= ~DMA_STARTED; | ||
389 | |||
390 | dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0; | ||
391 | dmap->byte_counter = 0; | ||
392 | reorganize_buffers(dev, adev->dmap_in, 1); | ||
393 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
394 | } | ||
395 | /* MUST be called with holding the dmap->lock */ | ||
396 | void DMAbuf_launch_output(int dev, struct dma_buffparms *dmap) | ||
397 | { | ||
398 | struct audio_operations *adev = audio_devs[dev]; | ||
399 | |||
400 | if (!((adev->enable_bits * adev->go) & PCM_ENABLE_OUTPUT)) | ||
401 | return; /* Don't start DMA yet */ | ||
402 | dmap->dma_mode = DMODE_OUTPUT; | ||
403 | |||
404 | if (!(dmap->flags & DMA_ACTIVE) || !(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) { | ||
405 | if (!(dmap->flags & DMA_STARTED)) { | ||
406 | reorganize_buffers(dev, dmap, 0); | ||
407 | if (adev->d->prepare_for_output(dev, dmap->fragment_size, dmap->nbufs)) | ||
408 | return; | ||
409 | if (!(dmap->flags & DMA_NODMA)) | ||
410 | local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_WRITE); | ||
411 | dmap->flags |= DMA_STARTED; | ||
412 | } | ||
413 | if (dmap->counts[dmap->qhead] == 0) | ||
414 | dmap->counts[dmap->qhead] = dmap->fragment_size; | ||
415 | dmap->dma_mode = DMODE_OUTPUT; | ||
416 | adev->d->output_block(dev, dmap->raw_buf_phys + dmap->qhead * dmap->fragment_size, | ||
417 | dmap->counts[dmap->qhead], 1); | ||
418 | if (adev->d->trigger) | ||
419 | adev->d->trigger(dev,adev->enable_bits * adev->go); | ||
420 | } | ||
421 | dmap->flags |= DMA_ACTIVE; | ||
422 | } | ||
423 | |||
424 | int DMAbuf_sync(int dev) | ||
425 | { | ||
426 | struct audio_operations *adev = audio_devs[dev]; | ||
427 | unsigned long flags; | ||
428 | int n = 0; | ||
429 | struct dma_buffparms *dmap; | ||
430 | |||
431 | if (!adev->go && !(adev->enable_bits & PCM_ENABLE_OUTPUT)) | ||
432 | return 0; | ||
433 | |||
434 | if (adev->dmap_out->dma_mode == DMODE_OUTPUT) { | ||
435 | dmap = adev->dmap_out; | ||
436 | spin_lock_irqsave(&dmap->lock,flags); | ||
437 | if (dmap->qlen > 0 && !(dmap->flags & DMA_ACTIVE)) | ||
438 | DMAbuf_launch_output(dev, dmap); | ||
439 | adev->dmap_out->flags |= DMA_SYNCING; | ||
440 | adev->dmap_out->underrun_count = 0; | ||
441 | while (!signal_pending(current) && n++ <= adev->dmap_out->nbufs && | ||
442 | adev->dmap_out->qlen && adev->dmap_out->underrun_count == 0) { | ||
443 | long t = dmabuf_timeout(dmap); | ||
444 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
445 | /* FIXME: not safe may miss events */ | ||
446 | t = interruptible_sleep_on_timeout(&adev->out_sleeper, t); | ||
447 | spin_lock_irqsave(&dmap->lock,flags); | ||
448 | if (!t) { | ||
449 | adev->dmap_out->flags &= ~DMA_SYNCING; | ||
450 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
451 | return adev->dmap_out->qlen; | ||
452 | } | ||
453 | } | ||
454 | adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE); | ||
455 | |||
456 | /* | ||
457 | * Some devices such as GUS have huge amount of on board RAM for the | ||
458 | * audio data. We have to wait until the device has finished playing. | ||
459 | */ | ||
460 | |||
461 | /* still holding the lock */ | ||
462 | if (adev->d->local_qlen) { /* Device has hidden buffers */ | ||
463 | while (!signal_pending(current) && | ||
464 | adev->d->local_qlen(dev)){ | ||
465 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
466 | interruptible_sleep_on_timeout(&adev->out_sleeper, | ||
467 | dmabuf_timeout(dmap)); | ||
468 | spin_lock_irqsave(&dmap->lock,flags); | ||
469 | } | ||
470 | } | ||
471 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
472 | } | ||
473 | adev->dmap_out->dma_mode = DMODE_NONE; | ||
474 | return adev->dmap_out->qlen; | ||
475 | } | ||
476 | |||
477 | int DMAbuf_release(int dev, int mode) | ||
478 | { | ||
479 | struct audio_operations *adev = audio_devs[dev]; | ||
480 | struct dma_buffparms *dmap; | ||
481 | unsigned long flags; | ||
482 | |||
483 | dmap = adev->dmap_out; | ||
484 | if (adev->open_mode & OPEN_WRITE) | ||
485 | adev->dmap_out->closing = 1; | ||
486 | |||
487 | if (adev->open_mode & OPEN_READ){ | ||
488 | adev->dmap_in->closing = 1; | ||
489 | dmap = adev->dmap_in; | ||
490 | } | ||
491 | if (adev->open_mode & OPEN_WRITE) | ||
492 | if (!(adev->dmap_out->mapping_flags & DMA_MAP_MAPPED)) | ||
493 | if (!signal_pending(current) && (adev->dmap_out->dma_mode == DMODE_OUTPUT)) | ||
494 | DMAbuf_sync(dev); | ||
495 | if (adev->dmap_out->dma_mode == DMODE_OUTPUT) | ||
496 | memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte, adev->dmap_out->bytes_in_use); | ||
497 | |||
498 | DMAbuf_reset(dev); | ||
499 | spin_lock_irqsave(&dmap->lock,flags); | ||
500 | adev->d->close(dev); | ||
501 | |||
502 | if (adev->open_mode & OPEN_WRITE) | ||
503 | close_dmap(adev, adev->dmap_out); | ||
504 | |||
505 | if (adev->open_mode == OPEN_READ || | ||
506 | (adev->open_mode != OPEN_WRITE && | ||
507 | (adev->flags & DMA_DUPLEX))) | ||
508 | close_dmap(adev, adev->dmap_in); | ||
509 | adev->open_mode = 0; | ||
510 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
511 | return 0; | ||
512 | } | ||
513 | /* called with dmap->lock dold */ | ||
514 | int DMAbuf_activate_recording(int dev, struct dma_buffparms *dmap) | ||
515 | { | ||
516 | struct audio_operations *adev = audio_devs[dev]; | ||
517 | int err; | ||
518 | |||
519 | if (!(adev->open_mode & OPEN_READ)) | ||
520 | return 0; | ||
521 | if (!(adev->enable_bits & PCM_ENABLE_INPUT)) | ||
522 | return 0; | ||
523 | if (dmap->dma_mode == DMODE_OUTPUT) { /* Direction change */ | ||
524 | /* release lock - it's not recursive */ | ||
525 | spin_unlock_irq(&dmap->lock); | ||
526 | DMAbuf_sync(dev); | ||
527 | DMAbuf_reset(dev); | ||
528 | spin_lock_irq(&dmap->lock); | ||
529 | dmap->dma_mode = DMODE_NONE; | ||
530 | } | ||
531 | if (!dmap->dma_mode) { | ||
532 | reorganize_buffers(dev, dmap, 1); | ||
533 | if ((err = adev->d->prepare_for_input(dev, | ||
534 | dmap->fragment_size, dmap->nbufs)) < 0) | ||
535 | return err; | ||
536 | dmap->dma_mode = DMODE_INPUT; | ||
537 | } | ||
538 | if (!(dmap->flags & DMA_ACTIVE)) { | ||
539 | if (dmap->needs_reorg) | ||
540 | reorganize_buffers(dev, dmap, 0); | ||
541 | local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ); | ||
542 | adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, | ||
543 | dmap->fragment_size, 0); | ||
544 | dmap->flags |= DMA_ACTIVE; | ||
545 | if (adev->d->trigger) | ||
546 | adev->d->trigger(dev, adev->enable_bits * adev->go); | ||
547 | } | ||
548 | return 0; | ||
549 | } | ||
550 | /* aquires lock */ | ||
551 | int DMAbuf_getrdbuffer(int dev, char **buf, int *len, int dontblock) | ||
552 | { | ||
553 | struct audio_operations *adev = audio_devs[dev]; | ||
554 | unsigned long flags; | ||
555 | int err = 0, n = 0; | ||
556 | struct dma_buffparms *dmap = adev->dmap_in; | ||
557 | int go; | ||
558 | |||
559 | if (!(adev->open_mode & OPEN_READ)) | ||
560 | return -EIO; | ||
561 | spin_lock_irqsave(&dmap->lock,flags); | ||
562 | if (dmap->needs_reorg) | ||
563 | reorganize_buffers(dev, dmap, 0); | ||
564 | if (adev->dmap_in->mapping_flags & DMA_MAP_MAPPED) { | ||
565 | /* printk(KERN_WARNING "Sound: Can't read from mmapped device (1)\n");*/ | ||
566 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
567 | return -EINVAL; | ||
568 | } else while (dmap->qlen <= 0 && n++ < 10) { | ||
569 | long timeout = MAX_SCHEDULE_TIMEOUT; | ||
570 | if (!(adev->enable_bits & PCM_ENABLE_INPUT) || !adev->go) { | ||
571 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
572 | return -EAGAIN; | ||
573 | } | ||
574 | if ((err = DMAbuf_activate_recording(dev, dmap)) < 0) { | ||
575 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
576 | return err; | ||
577 | } | ||
578 | /* Wait for the next block */ | ||
579 | |||
580 | if (dontblock) { | ||
581 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
582 | return -EAGAIN; | ||
583 | } | ||
584 | if ((go = adev->go)) | ||
585 | timeout = dmabuf_timeout(dmap); | ||
586 | |||
587 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
588 | timeout = interruptible_sleep_on_timeout(&adev->in_sleeper, | ||
589 | timeout); | ||
590 | if (!timeout) { | ||
591 | /* FIXME: include device name */ | ||
592 | err = -EIO; | ||
593 | printk(KERN_WARNING "Sound: DMA (input) timed out - IRQ/DRQ config error?\n"); | ||
594 | dma_reset_input(dev); | ||
595 | } else | ||
596 | err = -EINTR; | ||
597 | spin_lock_irqsave(&dmap->lock,flags); | ||
598 | } | ||
599 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
600 | |||
601 | if (dmap->qlen <= 0) | ||
602 | return err ? err : -EINTR; | ||
603 | *buf = &dmap->raw_buf[dmap->qhead * dmap->fragment_size + dmap->counts[dmap->qhead]]; | ||
604 | *len = dmap->fragment_size - dmap->counts[dmap->qhead]; | ||
605 | |||
606 | return dmap->qhead; | ||
607 | } | ||
608 | |||
609 | int DMAbuf_rmchars(int dev, int buff_no, int c) | ||
610 | { | ||
611 | struct audio_operations *adev = audio_devs[dev]; | ||
612 | struct dma_buffparms *dmap = adev->dmap_in; | ||
613 | int p = dmap->counts[dmap->qhead] + c; | ||
614 | |||
615 | if (dmap->mapping_flags & DMA_MAP_MAPPED) | ||
616 | { | ||
617 | /* printk("Sound: Can't read from mmapped device (2)\n");*/ | ||
618 | return -EINVAL; | ||
619 | } | ||
620 | else if (dmap->qlen <= 0) | ||
621 | return -EIO; | ||
622 | else if (p >= dmap->fragment_size) { /* This buffer is completely empty */ | ||
623 | dmap->counts[dmap->qhead] = 0; | ||
624 | dmap->qlen--; | ||
625 | dmap->qhead = (dmap->qhead + 1) % dmap->nbufs; | ||
626 | } | ||
627 | else dmap->counts[dmap->qhead] = p; | ||
628 | |||
629 | return 0; | ||
630 | } | ||
631 | /* MUST be called with dmap->lock hold */ | ||
632 | int DMAbuf_get_buffer_pointer(int dev, struct dma_buffparms *dmap, int direction) | ||
633 | { | ||
634 | /* | ||
635 | * Try to approximate the active byte position of the DMA pointer within the | ||
636 | * buffer area as well as possible. | ||
637 | */ | ||
638 | |||
639 | int pos; | ||
640 | unsigned long f; | ||
641 | |||
642 | if (!(dmap->flags & DMA_ACTIVE)) | ||
643 | pos = 0; | ||
644 | else { | ||
645 | int chan = dmap->dma; | ||
646 | |||
647 | f=claim_dma_lock(); | ||
648 | clear_dma_ff(chan); | ||
649 | |||
650 | if(!isa_dma_bridge_buggy) | ||
651 | disable_dma(dmap->dma); | ||
652 | |||
653 | pos = get_dma_residue(chan); | ||
654 | |||
655 | pos = dmap->bytes_in_use - pos; | ||
656 | |||
657 | if (!(dmap->mapping_flags & DMA_MAP_MAPPED)) { | ||
658 | if (direction == DMODE_OUTPUT) { | ||
659 | if (dmap->qhead == 0) | ||
660 | if (pos > dmap->fragment_size) | ||
661 | pos = 0; | ||
662 | } else { | ||
663 | if (dmap->qtail == 0) | ||
664 | if (pos > dmap->fragment_size) | ||
665 | pos = 0; | ||
666 | } | ||
667 | } | ||
668 | if (pos < 0) | ||
669 | pos = 0; | ||
670 | if (pos >= dmap->bytes_in_use) | ||
671 | pos = 0; | ||
672 | |||
673 | if(!isa_dma_bridge_buggy) | ||
674 | enable_dma(dmap->dma); | ||
675 | |||
676 | release_dma_lock(f); | ||
677 | } | ||
678 | /* printk( "%04x ", pos); */ | ||
679 | |||
680 | return pos; | ||
681 | } | ||
682 | |||
683 | /* | ||
684 | * DMAbuf_start_devices() is called by the /dev/music driver to start | ||
685 | * one or more audio devices at desired moment. | ||
686 | */ | ||
687 | |||
688 | void DMAbuf_start_devices(unsigned int devmask) | ||
689 | { | ||
690 | struct audio_operations *adev; | ||
691 | int dev; | ||
692 | |||
693 | for (dev = 0; dev < num_audiodevs; dev++) { | ||
694 | if (!(devmask & (1 << dev))) | ||
695 | continue; | ||
696 | if (!(adev = audio_devs[dev])) | ||
697 | continue; | ||
698 | if (adev->open_mode == 0) | ||
699 | continue; | ||
700 | if (adev->go) | ||
701 | continue; | ||
702 | /* OK to start the device */ | ||
703 | adev->go = 1; | ||
704 | if (adev->d->trigger) | ||
705 | adev->d->trigger(dev,adev->enable_bits * adev->go); | ||
706 | } | ||
707 | } | ||
708 | /* via poll called without a lock ?*/ | ||
709 | int DMAbuf_space_in_queue(int dev) | ||
710 | { | ||
711 | struct audio_operations *adev = audio_devs[dev]; | ||
712 | int len, max, tmp; | ||
713 | struct dma_buffparms *dmap = adev->dmap_out; | ||
714 | int lim = dmap->nbufs; | ||
715 | |||
716 | if (lim < 2) | ||
717 | lim = 2; | ||
718 | |||
719 | if (dmap->qlen >= lim) /* No space at all */ | ||
720 | return 0; | ||
721 | |||
722 | /* | ||
723 | * Verify that there are no more pending buffers than the limit | ||
724 | * defined by the process. | ||
725 | */ | ||
726 | |||
727 | max = dmap->max_fragments; | ||
728 | if (max > lim) | ||
729 | max = lim; | ||
730 | len = dmap->qlen; | ||
731 | |||
732 | if (adev->d->local_qlen) { | ||
733 | tmp = adev->d->local_qlen(dev); | ||
734 | if (tmp && len) | ||
735 | tmp--; /* This buffer has been counted twice */ | ||
736 | len += tmp; | ||
737 | } | ||
738 | if (dmap->byte_counter % dmap->fragment_size) /* There is a partial fragment */ | ||
739 | len = len + 1; | ||
740 | |||
741 | if (len >= max) | ||
742 | return 0; | ||
743 | return max - len; | ||
744 | } | ||
745 | /* MUST not hold the spinlock - this function may sleep */ | ||
746 | static int output_sleep(int dev, int dontblock) | ||
747 | { | ||
748 | struct audio_operations *adev = audio_devs[dev]; | ||
749 | int err = 0; | ||
750 | struct dma_buffparms *dmap = adev->dmap_out; | ||
751 | long timeout; | ||
752 | long timeout_value; | ||
753 | |||
754 | if (dontblock) | ||
755 | return -EAGAIN; | ||
756 | if (!(adev->enable_bits & PCM_ENABLE_OUTPUT)) | ||
757 | return -EAGAIN; | ||
758 | |||
759 | /* | ||
760 | * Wait for free space | ||
761 | */ | ||
762 | if (signal_pending(current)) | ||
763 | return -EINTR; | ||
764 | timeout = (adev->go && !(dmap->flags & DMA_NOTIMEOUT)); | ||
765 | if (timeout) | ||
766 | timeout_value = dmabuf_timeout(dmap); | ||
767 | else | ||
768 | timeout_value = MAX_SCHEDULE_TIMEOUT; | ||
769 | timeout_value = interruptible_sleep_on_timeout(&adev->out_sleeper, | ||
770 | timeout_value); | ||
771 | if (timeout != MAX_SCHEDULE_TIMEOUT && !timeout_value) { | ||
772 | printk(KERN_WARNING "Sound: DMA (output) timed out - IRQ/DRQ config error?\n"); | ||
773 | dma_reset_output(dev); | ||
774 | } else { | ||
775 | if (signal_pending(current)) | ||
776 | err = -EINTR; | ||
777 | } | ||
778 | return err; | ||
779 | } | ||
780 | /* called with the lock held */ | ||
781 | static int find_output_space(int dev, char **buf, int *size) | ||
782 | { | ||
783 | struct audio_operations *adev = audio_devs[dev]; | ||
784 | struct dma_buffparms *dmap = adev->dmap_out; | ||
785 | unsigned long active_offs; | ||
786 | long len, offs; | ||
787 | int maxfrags; | ||
788 | int occupied_bytes = (dmap->user_counter % dmap->fragment_size); | ||
789 | |||
790 | *buf = dmap->raw_buf; | ||
791 | if (!(maxfrags = DMAbuf_space_in_queue(dev)) && !occupied_bytes) | ||
792 | return 0; | ||
793 | |||
794 | #ifdef BE_CONSERVATIVE | ||
795 | active_offs = dmap->byte_counter + dmap->qhead * dmap->fragment_size; | ||
796 | #else | ||
797 | active_offs = DMAbuf_get_buffer_pointer(dev, dmap, DMODE_OUTPUT); | ||
798 | /* Check for pointer wrapping situation */ | ||
799 | if (active_offs < 0 || active_offs >= dmap->bytes_in_use) | ||
800 | active_offs = 0; | ||
801 | active_offs += dmap->byte_counter; | ||
802 | #endif | ||
803 | |||
804 | offs = (dmap->user_counter % dmap->bytes_in_use) & ~SAMPLE_ROUNDUP; | ||
805 | if (offs < 0 || offs >= dmap->bytes_in_use) { | ||
806 | printk(KERN_ERR "Sound: Got unexpected offs %ld. Giving up.\n", offs); | ||
807 | printk("Counter = %ld, bytes=%d\n", dmap->user_counter, dmap->bytes_in_use); | ||
808 | return 0; | ||
809 | } | ||
810 | *buf = dmap->raw_buf + offs; | ||
811 | |||
812 | len = active_offs + dmap->bytes_in_use - dmap->user_counter; /* Number of unused bytes in buffer */ | ||
813 | |||
814 | if ((offs + len) > dmap->bytes_in_use) | ||
815 | len = dmap->bytes_in_use - offs; | ||
816 | if (len < 0) { | ||
817 | return 0; | ||
818 | } | ||
819 | if (len > ((maxfrags * dmap->fragment_size) - occupied_bytes)) | ||
820 | len = (maxfrags * dmap->fragment_size) - occupied_bytes; | ||
821 | *size = len & ~SAMPLE_ROUNDUP; | ||
822 | return (*size > 0); | ||
823 | } | ||
824 | /* aquires lock */ | ||
825 | int DMAbuf_getwrbuffer(int dev, char **buf, int *size, int dontblock) | ||
826 | { | ||
827 | struct audio_operations *adev = audio_devs[dev]; | ||
828 | unsigned long flags; | ||
829 | int err = -EIO; | ||
830 | struct dma_buffparms *dmap = adev->dmap_out; | ||
831 | |||
832 | if (dmap->mapping_flags & DMA_MAP_MAPPED) { | ||
833 | /* printk(KERN_DEBUG "Sound: Can't write to mmapped device (3)\n");*/ | ||
834 | return -EINVAL; | ||
835 | } | ||
836 | spin_lock_irqsave(&dmap->lock,flags); | ||
837 | if (dmap->needs_reorg) | ||
838 | reorganize_buffers(dev, dmap, 0); | ||
839 | |||
840 | if (dmap->dma_mode == DMODE_INPUT) { /* Direction change */ | ||
841 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
842 | DMAbuf_reset(dev); | ||
843 | spin_lock_irqsave(&dmap->lock,flags); | ||
844 | } | ||
845 | dmap->dma_mode = DMODE_OUTPUT; | ||
846 | |||
847 | while (find_output_space(dev, buf, size) <= 0) { | ||
848 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
849 | if ((err = output_sleep(dev, dontblock)) < 0) { | ||
850 | return err; | ||
851 | } | ||
852 | spin_lock_irqsave(&dmap->lock,flags); | ||
853 | } | ||
854 | |||
855 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
856 | return 0; | ||
857 | } | ||
858 | /* has to aquire dmap->lock */ | ||
859 | int DMAbuf_move_wrpointer(int dev, int l) | ||
860 | { | ||
861 | struct audio_operations *adev = audio_devs[dev]; | ||
862 | struct dma_buffparms *dmap = adev->dmap_out; | ||
863 | unsigned long ptr; | ||
864 | unsigned long end_ptr, p; | ||
865 | int post; | ||
866 | unsigned long flags; | ||
867 | |||
868 | spin_lock_irqsave(&dmap->lock,flags); | ||
869 | post= (dmap->flags & DMA_POST); | ||
870 | ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size; | ||
871 | |||
872 | dmap->flags &= ~DMA_POST; | ||
873 | dmap->cfrag = -1; | ||
874 | dmap->user_counter += l; | ||
875 | dmap->flags |= DMA_DIRTY; | ||
876 | |||
877 | if (dmap->byte_counter >= dmap->max_byte_counter) { | ||
878 | /* Wrap the byte counters */ | ||
879 | long decr = dmap->byte_counter; | ||
880 | dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use); | ||
881 | decr -= dmap->byte_counter; | ||
882 | dmap->user_counter -= decr; | ||
883 | } | ||
884 | end_ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size; | ||
885 | |||
886 | p = (dmap->user_counter - 1) % dmap->bytes_in_use; | ||
887 | dmap->neutral_byte = dmap->raw_buf[p]; | ||
888 | |||
889 | /* Update the fragment based bookkeeping too */ | ||
890 | while (ptr < end_ptr) { | ||
891 | dmap->counts[dmap->qtail] = dmap->fragment_size; | ||
892 | dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; | ||
893 | dmap->qlen++; | ||
894 | ptr += dmap->fragment_size; | ||
895 | } | ||
896 | |||
897 | dmap->counts[dmap->qtail] = dmap->user_counter - ptr; | ||
898 | |||
899 | /* | ||
900 | * Let the low level driver perform some postprocessing to | ||
901 | * the written data. | ||
902 | */ | ||
903 | if (adev->d->postprocess_write) | ||
904 | adev->d->postprocess_write(dev); | ||
905 | |||
906 | if (!(dmap->flags & DMA_ACTIVE)) | ||
907 | if (dmap->qlen > 1 || (dmap->qlen > 0 && (post || dmap->qlen >= dmap->nbufs - 1))) | ||
908 | DMAbuf_launch_output(dev, dmap); | ||
909 | |||
910 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
911 | return 0; | ||
912 | } | ||
913 | |||
914 | int DMAbuf_start_dma(int dev, unsigned long physaddr, int count, int dma_mode) | ||
915 | { | ||
916 | struct audio_operations *adev = audio_devs[dev]; | ||
917 | struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in; | ||
918 | |||
919 | if (dmap->raw_buf == NULL) { | ||
920 | printk(KERN_ERR "sound: DMA buffer(1) == NULL\n"); | ||
921 | printk("Device %d, chn=%s\n", dev, (dmap == adev->dmap_out) ? "out" : "in"); | ||
922 | return 0; | ||
923 | } | ||
924 | if (dmap->dma < 0) | ||
925 | return 0; | ||
926 | sound_start_dma(dmap, physaddr, count, dma_mode); | ||
927 | return count; | ||
928 | } | ||
929 | |||
930 | static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode) | ||
931 | { | ||
932 | struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in; | ||
933 | |||
934 | if (dmap->raw_buf == NULL) { | ||
935 | printk(KERN_ERR "sound: DMA buffer(2) == NULL\n"); | ||
936 | printk(KERN_ERR "Device %s, chn=%s\n", adev->name, (dmap == adev->dmap_out) ? "out" : "in"); | ||
937 | return 0; | ||
938 | } | ||
939 | if (dmap->flags & DMA_NODMA) | ||
940 | return 1; | ||
941 | if (dmap->dma < 0) | ||
942 | return 0; | ||
943 | sound_start_dma(dmap, dmap->raw_buf_phys, dmap->bytes_in_use, dma_mode | DMA_AUTOINIT); | ||
944 | dmap->flags |= DMA_STARTED; | ||
945 | return count; | ||
946 | } | ||
947 | |||
948 | static void finish_output_interrupt(int dev, struct dma_buffparms *dmap) | ||
949 | { | ||
950 | struct audio_operations *adev = audio_devs[dev]; | ||
951 | |||
952 | if (dmap->audio_callback != NULL) | ||
953 | dmap->audio_callback(dev, dmap->callback_parm); | ||
954 | wake_up(&adev->out_sleeper); | ||
955 | wake_up(&adev->poll_sleeper); | ||
956 | } | ||
957 | /* called with dmap->lock held in irq context*/ | ||
958 | static void do_outputintr(int dev, int dummy) | ||
959 | { | ||
960 | struct audio_operations *adev = audio_devs[dev]; | ||
961 | struct dma_buffparms *dmap = adev->dmap_out; | ||
962 | int this_fragment; | ||
963 | |||
964 | if (dmap->raw_buf == NULL) { | ||
965 | printk(KERN_ERR "Sound: Error. Audio interrupt (%d) after freeing buffers.\n", dev); | ||
966 | return; | ||
967 | } | ||
968 | if (dmap->mapping_flags & DMA_MAP_MAPPED) { /* Virtual memory mapped access */ | ||
969 | /* mmapped access */ | ||
970 | dmap->qhead = (dmap->qhead + 1) % dmap->nbufs; | ||
971 | if (dmap->qhead == 0) { /* Wrapped */ | ||
972 | dmap->byte_counter += dmap->bytes_in_use; | ||
973 | if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */ | ||
974 | long decr = dmap->byte_counter; | ||
975 | dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use); | ||
976 | decr -= dmap->byte_counter; | ||
977 | dmap->user_counter -= decr; | ||
978 | } | ||
979 | } | ||
980 | dmap->qlen++; /* Yes increment it (don't decrement) */ | ||
981 | if (!(adev->flags & DMA_AUTOMODE)) | ||
982 | dmap->flags &= ~DMA_ACTIVE; | ||
983 | dmap->counts[dmap->qhead] = dmap->fragment_size; | ||
984 | DMAbuf_launch_output(dev, dmap); | ||
985 | finish_output_interrupt(dev, dmap); | ||
986 | return; | ||
987 | } | ||
988 | |||
989 | dmap->qlen--; | ||
990 | this_fragment = dmap->qhead; | ||
991 | dmap->qhead = (dmap->qhead + 1) % dmap->nbufs; | ||
992 | |||
993 | if (dmap->qhead == 0) { /* Wrapped */ | ||
994 | dmap->byte_counter += dmap->bytes_in_use; | ||
995 | if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */ | ||
996 | long decr = dmap->byte_counter; | ||
997 | dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use); | ||
998 | decr -= dmap->byte_counter; | ||
999 | dmap->user_counter -= decr; | ||
1000 | } | ||
1001 | } | ||
1002 | if (!(adev->flags & DMA_AUTOMODE)) | ||
1003 | dmap->flags &= ~DMA_ACTIVE; | ||
1004 | |||
1005 | /* | ||
1006 | * This is dmap->qlen <= 0 except when closing when | ||
1007 | * dmap->qlen < 0 | ||
1008 | */ | ||
1009 | |||
1010 | while (dmap->qlen <= -dmap->closing) { | ||
1011 | dmap->underrun_count++; | ||
1012 | dmap->qlen++; | ||
1013 | if ((dmap->flags & DMA_DIRTY) && dmap->applic_profile != APF_CPUINTENS) { | ||
1014 | dmap->flags &= ~DMA_DIRTY; | ||
1015 | memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte, | ||
1016 | adev->dmap_out->buffsize); | ||
1017 | } | ||
1018 | dmap->user_counter += dmap->fragment_size; | ||
1019 | dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; | ||
1020 | } | ||
1021 | if (dmap->qlen > 0) | ||
1022 | DMAbuf_launch_output(dev, dmap); | ||
1023 | finish_output_interrupt(dev, dmap); | ||
1024 | } | ||
1025 | /* called in irq context */ | ||
1026 | void DMAbuf_outputintr(int dev, int notify_only) | ||
1027 | { | ||
1028 | struct audio_operations *adev = audio_devs[dev]; | ||
1029 | unsigned long flags; | ||
1030 | struct dma_buffparms *dmap = adev->dmap_out; | ||
1031 | |||
1032 | spin_lock_irqsave(&dmap->lock,flags); | ||
1033 | if (!(dmap->flags & DMA_NODMA)) { | ||
1034 | int chan = dmap->dma, pos, n; | ||
1035 | unsigned long f; | ||
1036 | |||
1037 | f=claim_dma_lock(); | ||
1038 | |||
1039 | if(!isa_dma_bridge_buggy) | ||
1040 | disable_dma(dmap->dma); | ||
1041 | clear_dma_ff(chan); | ||
1042 | pos = dmap->bytes_in_use - get_dma_residue(chan); | ||
1043 | if(!isa_dma_bridge_buggy) | ||
1044 | enable_dma(dmap->dma); | ||
1045 | release_dma_lock(f); | ||
1046 | |||
1047 | pos = pos / dmap->fragment_size; /* Actual qhead */ | ||
1048 | if (pos < 0 || pos >= dmap->nbufs) | ||
1049 | pos = 0; | ||
1050 | n = 0; | ||
1051 | while (dmap->qhead != pos && n++ < dmap->nbufs) | ||
1052 | do_outputintr(dev, notify_only); | ||
1053 | } | ||
1054 | else | ||
1055 | do_outputintr(dev, notify_only); | ||
1056 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
1057 | } | ||
1058 | /* called with dmap->lock held in irq context */ | ||
1059 | static void do_inputintr(int dev) | ||
1060 | { | ||
1061 | struct audio_operations *adev = audio_devs[dev]; | ||
1062 | struct dma_buffparms *dmap = adev->dmap_in; | ||
1063 | |||
1064 | if (dmap->raw_buf == NULL) { | ||
1065 | printk(KERN_ERR "Sound: Fatal error. Audio interrupt after freeing buffers.\n"); | ||
1066 | return; | ||
1067 | } | ||
1068 | if (dmap->mapping_flags & DMA_MAP_MAPPED) { | ||
1069 | dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; | ||
1070 | if (dmap->qtail == 0) { /* Wrapped */ | ||
1071 | dmap->byte_counter += dmap->bytes_in_use; | ||
1072 | if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */ | ||
1073 | long decr = dmap->byte_counter; | ||
1074 | dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use; | ||
1075 | decr -= dmap->byte_counter; | ||
1076 | dmap->user_counter -= decr; | ||
1077 | } | ||
1078 | } | ||
1079 | dmap->qlen++; | ||
1080 | |||
1081 | if (!(adev->flags & DMA_AUTOMODE)) { | ||
1082 | if (dmap->needs_reorg) | ||
1083 | reorganize_buffers(dev, dmap, 0); | ||
1084 | local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_READ); | ||
1085 | adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, | ||
1086 | dmap->fragment_size, 1); | ||
1087 | if (adev->d->trigger) | ||
1088 | adev->d->trigger(dev, adev->enable_bits * adev->go); | ||
1089 | } | ||
1090 | dmap->flags |= DMA_ACTIVE; | ||
1091 | } else if (dmap->qlen >= (dmap->nbufs - 1)) { | ||
1092 | printk(KERN_WARNING "Sound: Recording overrun\n"); | ||
1093 | dmap->underrun_count++; | ||
1094 | |||
1095 | /* Just throw away the oldest fragment but keep the engine running */ | ||
1096 | dmap->qhead = (dmap->qhead + 1) % dmap->nbufs; | ||
1097 | dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; | ||
1098 | } else if (dmap->qlen >= 0 && dmap->qlen < dmap->nbufs) { | ||
1099 | dmap->qlen++; | ||
1100 | dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; | ||
1101 | if (dmap->qtail == 0) { /* Wrapped */ | ||
1102 | dmap->byte_counter += dmap->bytes_in_use; | ||
1103 | if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */ | ||
1104 | long decr = dmap->byte_counter; | ||
1105 | dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use; | ||
1106 | decr -= dmap->byte_counter; | ||
1107 | dmap->user_counter -= decr; | ||
1108 | } | ||
1109 | } | ||
1110 | } | ||
1111 | if (!(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) { | ||
1112 | local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ); | ||
1113 | adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, dmap->fragment_size, 1); | ||
1114 | if (adev->d->trigger) | ||
1115 | adev->d->trigger(dev,adev->enable_bits * adev->go); | ||
1116 | } | ||
1117 | dmap->flags |= DMA_ACTIVE; | ||
1118 | if (dmap->qlen > 0) | ||
1119 | { | ||
1120 | wake_up(&adev->in_sleeper); | ||
1121 | wake_up(&adev->poll_sleeper); | ||
1122 | } | ||
1123 | } | ||
1124 | /* called in irq context */ | ||
1125 | void DMAbuf_inputintr(int dev) | ||
1126 | { | ||
1127 | struct audio_operations *adev = audio_devs[dev]; | ||
1128 | struct dma_buffparms *dmap = adev->dmap_in; | ||
1129 | unsigned long flags; | ||
1130 | |||
1131 | spin_lock_irqsave(&dmap->lock,flags); | ||
1132 | |||
1133 | if (!(dmap->flags & DMA_NODMA)) { | ||
1134 | int chan = dmap->dma, pos, n; | ||
1135 | unsigned long f; | ||
1136 | |||
1137 | f=claim_dma_lock(); | ||
1138 | if(!isa_dma_bridge_buggy) | ||
1139 | disable_dma(dmap->dma); | ||
1140 | clear_dma_ff(chan); | ||
1141 | pos = dmap->bytes_in_use - get_dma_residue(chan); | ||
1142 | if(!isa_dma_bridge_buggy) | ||
1143 | enable_dma(dmap->dma); | ||
1144 | release_dma_lock(f); | ||
1145 | |||
1146 | pos = pos / dmap->fragment_size; /* Actual qhead */ | ||
1147 | if (pos < 0 || pos >= dmap->nbufs) | ||
1148 | pos = 0; | ||
1149 | |||
1150 | n = 0; | ||
1151 | while (dmap->qtail != pos && ++n < dmap->nbufs) | ||
1152 | do_inputintr(dev); | ||
1153 | } else | ||
1154 | do_inputintr(dev); | ||
1155 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
1156 | } | ||
1157 | |||
1158 | int DMAbuf_open_dma(int dev) | ||
1159 | { | ||
1160 | /* | ||
1161 | * NOTE! This routine opens only the primary DMA channel (output). | ||
1162 | */ | ||
1163 | struct audio_operations *adev = audio_devs[dev]; | ||
1164 | int err; | ||
1165 | |||
1166 | if ((err = open_dmap(adev, OPEN_READWRITE, adev->dmap_out)) < 0) | ||
1167 | return -EBUSY; | ||
1168 | dma_init_buffers(adev->dmap_out); | ||
1169 | adev->dmap_out->flags |= DMA_ALLOC_DONE; | ||
1170 | adev->dmap_out->fragment_size = adev->dmap_out->buffsize; | ||
1171 | |||
1172 | if (adev->dmap_out->dma >= 0) { | ||
1173 | unsigned long flags; | ||
1174 | |||
1175 | flags=claim_dma_lock(); | ||
1176 | clear_dma_ff(adev->dmap_out->dma); | ||
1177 | disable_dma(adev->dmap_out->dma); | ||
1178 | release_dma_lock(flags); | ||
1179 | } | ||
1180 | return 0; | ||
1181 | } | ||
1182 | |||
1183 | void DMAbuf_close_dma(int dev) | ||
1184 | { | ||
1185 | close_dmap(audio_devs[dev], audio_devs[dev]->dmap_out); | ||
1186 | } | ||
1187 | |||
1188 | void DMAbuf_init(int dev, int dma1, int dma2) | ||
1189 | { | ||
1190 | struct audio_operations *adev = audio_devs[dev]; | ||
1191 | /* | ||
1192 | * NOTE! This routine could be called several times. | ||
1193 | */ | ||
1194 | |||
1195 | /* drag in audio_syms.o */ | ||
1196 | { | ||
1197 | extern char audio_syms_symbol; | ||
1198 | audio_syms_symbol = 0; | ||
1199 | } | ||
1200 | |||
1201 | if (adev && adev->dmap_out == NULL) { | ||
1202 | if (adev->d == NULL) | ||
1203 | panic("OSS: audio_devs[%d]->d == NULL\n", dev); | ||
1204 | |||
1205 | if (adev->parent_dev) { /* Use DMA map of the parent dev */ | ||
1206 | int parent = adev->parent_dev - 1; | ||
1207 | adev->dmap_out = audio_devs[parent]->dmap_out; | ||
1208 | adev->dmap_in = audio_devs[parent]->dmap_in; | ||
1209 | } else { | ||
1210 | adev->dmap_out = adev->dmap_in = &adev->dmaps[0]; | ||
1211 | adev->dmap_out->dma = dma1; | ||
1212 | if (adev->flags & DMA_DUPLEX) { | ||
1213 | adev->dmap_in = &adev->dmaps[1]; | ||
1214 | adev->dmap_in->dma = dma2; | ||
1215 | } | ||
1216 | } | ||
1217 | /* Persistent DMA buffers allocated here */ | ||
1218 | if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) { | ||
1219 | if (adev->dmap_in->raw_buf == NULL) | ||
1220 | sound_alloc_dmap(adev->dmap_in); | ||
1221 | if (adev->dmap_out->raw_buf == NULL) | ||
1222 | sound_alloc_dmap(adev->dmap_out); | ||
1223 | } | ||
1224 | } | ||
1225 | } | ||
1226 | |||
1227 | /* No kernel lock - DMAbuf_activate_recording protected by global cli/sti */ | ||
1228 | static unsigned int poll_input(struct file * file, int dev, poll_table *wait) | ||
1229 | { | ||
1230 | struct audio_operations *adev = audio_devs[dev]; | ||
1231 | struct dma_buffparms *dmap = adev->dmap_in; | ||
1232 | |||
1233 | if (!(adev->open_mode & OPEN_READ)) | ||
1234 | return 0; | ||
1235 | if (dmap->mapping_flags & DMA_MAP_MAPPED) { | ||
1236 | if (dmap->qlen) | ||
1237 | return POLLIN | POLLRDNORM; | ||
1238 | return 0; | ||
1239 | } | ||
1240 | if (dmap->dma_mode != DMODE_INPUT) { | ||
1241 | if (dmap->dma_mode == DMODE_NONE && | ||
1242 | adev->enable_bits & PCM_ENABLE_INPUT && | ||
1243 | !dmap->qlen && adev->go) { | ||
1244 | unsigned long flags; | ||
1245 | |||
1246 | spin_lock_irqsave(&dmap->lock,flags); | ||
1247 | DMAbuf_activate_recording(dev, dmap); | ||
1248 | spin_unlock_irqrestore(&dmap->lock,flags); | ||
1249 | } | ||
1250 | return 0; | ||
1251 | } | ||
1252 | if (!dmap->qlen) | ||
1253 | return 0; | ||
1254 | return POLLIN | POLLRDNORM; | ||
1255 | } | ||
1256 | |||
1257 | static unsigned int poll_output(struct file * file, int dev, poll_table *wait) | ||
1258 | { | ||
1259 | struct audio_operations *adev = audio_devs[dev]; | ||
1260 | struct dma_buffparms *dmap = adev->dmap_out; | ||
1261 | |||
1262 | if (!(adev->open_mode & OPEN_WRITE)) | ||
1263 | return 0; | ||
1264 | if (dmap->mapping_flags & DMA_MAP_MAPPED) { | ||
1265 | if (dmap->qlen) | ||
1266 | return POLLOUT | POLLWRNORM; | ||
1267 | return 0; | ||
1268 | } | ||
1269 | if (dmap->dma_mode == DMODE_INPUT) | ||
1270 | return 0; | ||
1271 | if (dmap->dma_mode == DMODE_NONE) | ||
1272 | return POLLOUT | POLLWRNORM; | ||
1273 | if (!DMAbuf_space_in_queue(dev)) | ||
1274 | return 0; | ||
1275 | return POLLOUT | POLLWRNORM; | ||
1276 | } | ||
1277 | |||
1278 | unsigned int DMAbuf_poll(struct file * file, int dev, poll_table *wait) | ||
1279 | { | ||
1280 | struct audio_operations *adev = audio_devs[dev]; | ||
1281 | poll_wait(file, &adev->poll_sleeper, wait); | ||
1282 | return poll_input(file, dev, wait) | poll_output(file, dev, wait); | ||
1283 | } | ||
1284 | |||
1285 | void DMAbuf_deinit(int dev) | ||
1286 | { | ||
1287 | struct audio_operations *adev = audio_devs[dev]; | ||
1288 | /* This routine is called when driver is being unloaded */ | ||
1289 | if (!adev) | ||
1290 | return; | ||
1291 | |||
1292 | /* Persistent DMA buffers deallocated here */ | ||
1293 | if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) { | ||
1294 | sound_free_dmap(adev->dmap_out); | ||
1295 | if (adev->flags & DMA_DUPLEX) | ||
1296 | sound_free_dmap(adev->dmap_in); | ||
1297 | } | ||
1298 | } | ||