Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | } |