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Commit | Line | Data |
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1da177e4 | 1 | /* |
f30c2269 | 2 | * sound/oss/dmabuf.c |
1da177e4 LT |
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 | ||
f23f6e08 | 28 | #include <linux/mm.h> |
5a0e3ad6 | 29 | #include <linux/gfp.h> |
1da177e4 LT |
30 | #include "sound_config.h" |
31 | ||
32 | #define DMAP_FREE_ON_CLOSE 0 | |
33 | #define DMAP_KEEP_ON_CLOSE 1 | |
34 | extern int sound_dmap_flag; | |
35 | ||
36 | static void dma_reset_output(int dev); | |
37 | static void dma_reset_input(int dev); | |
38 | static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode); | |
39 | ||
40 | ||
41 | ||
42 | static int debugmem; /* switched off by default */ | |
43 | static int dma_buffsize = DSP_BUFFSIZE; | |
44 | ||
45 | static long dmabuf_timeout(struct dma_buffparms *dmap) | |
46 | { | |
47 | long tmout; | |
48 | ||
49 | tmout = (dmap->fragment_size * HZ) / dmap->data_rate; | |
50 | tmout += HZ / 5; /* Some safety distance */ | |
51 | if (tmout < (HZ / 2)) | |
52 | tmout = HZ / 2; | |
53 | if (tmout > 20 * HZ) | |
54 | tmout = 20 * HZ; | |
55 | return tmout; | |
56 | } | |
57 | ||
58 | static int sound_alloc_dmap(struct dma_buffparms *dmap) | |
59 | { | |
60 | char *start_addr, *end_addr; | |
61 | int dma_pagesize; | |
62 | int sz, size; | |
63 | struct page *page; | |
64 | ||
65 | dmap->mapping_flags &= ~DMA_MAP_MAPPED; | |
66 | ||
67 | if (dmap->raw_buf != NULL) | |
68 | return 0; /* Already done */ | |
69 | if (dma_buffsize < 4096) | |
70 | dma_buffsize = 4096; | |
71 | dma_pagesize = (dmap->dma < 4) ? (64 * 1024) : (128 * 1024); | |
72 | ||
73 | /* | |
74 | * Now check for the Cyrix problem. | |
75 | */ | |
76 | ||
77 | if(isa_dma_bridge_buggy==2) | |
78 | dma_pagesize=32768; | |
79 | ||
80 | dmap->raw_buf = NULL; | |
81 | dmap->buffsize = dma_buffsize; | |
82 | if (dmap->buffsize > dma_pagesize) | |
83 | dmap->buffsize = dma_pagesize; | |
84 | start_addr = NULL; | |
85 | /* | |
86 | * Now loop until we get a free buffer. Try to get smaller buffer if | |
87 | * it fails. Don't accept smaller than 8k buffer for performance | |
88 | * reasons. | |
89 | */ | |
90 | while (start_addr == NULL && dmap->buffsize > PAGE_SIZE) { | |
91 | for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1); | |
92 | dmap->buffsize = PAGE_SIZE * (1 << sz); | |
93 | start_addr = (char *) __get_free_pages(GFP_ATOMIC|GFP_DMA|__GFP_NOWARN, sz); | |
94 | if (start_addr == NULL) | |
95 | dmap->buffsize /= 2; | |
96 | } | |
97 | ||
98 | if (start_addr == NULL) { | |
99 | printk(KERN_WARNING "Sound error: Couldn't allocate DMA buffer\n"); | |
100 | return -ENOMEM; | |
101 | } else { | |
102 | /* make some checks */ | |
103 | end_addr = start_addr + dmap->buffsize - 1; | |
104 | ||
105 | if (debugmem) | |
106 | printk(KERN_DEBUG "sound: start 0x%lx, end 0x%lx\n", (long) start_addr, (long) end_addr); | |
107 | ||
108 | /* now check if it fits into the same dma-pagesize */ | |
109 | ||
110 | if (((long) start_addr & ~(dma_pagesize - 1)) != ((long) end_addr & ~(dma_pagesize - 1)) | |
111 | || end_addr >= (char *) (MAX_DMA_ADDRESS)) { | |
112 | printk(KERN_ERR "sound: Got invalid address 0x%lx for %db DMA-buffer\n", (long) start_addr, dmap->buffsize); | |
113 | return -EFAULT; | |
114 | } | |
115 | } | |
116 | dmap->raw_buf = start_addr; | |
117 | dmap->raw_buf_phys = virt_to_bus(start_addr); | |
118 | ||
119 | for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++) | |
120 | SetPageReserved(page); | |
121 | return 0; | |
122 | } | |
123 | ||
124 | static void sound_free_dmap(struct dma_buffparms *dmap) | |
125 | { | |
126 | int sz, size; | |
127 | struct page *page; | |
128 | unsigned long start_addr, end_addr; | |
129 | ||
130 | if (dmap->raw_buf == NULL) | |
131 | return; | |
132 | if (dmap->mapping_flags & DMA_MAP_MAPPED) | |
133 | return; /* Don't free mmapped buffer. Will use it next time */ | |
134 | for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1); | |
135 | ||
136 | start_addr = (unsigned long) dmap->raw_buf; | |
137 | end_addr = start_addr + dmap->buffsize; | |
138 | ||
139 | for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++) | |
140 | ClearPageReserved(page); | |
141 | ||
142 | free_pages((unsigned long) dmap->raw_buf, sz); | |
143 | dmap->raw_buf = NULL; | |
144 | } | |
145 | ||
146 | ||
147 | /* Intel version !!!!!!!!! */ | |
148 | ||
149 | static int sound_start_dma(struct dma_buffparms *dmap, unsigned long physaddr, int count, int dma_mode) | |
150 | { | |
151 | unsigned long flags; | |
152 | int chan = dmap->dma; | |
153 | ||
154 | /* printk( "Start DMA%d %d, %d\n", chan, (int)(physaddr-dmap->raw_buf_phys), count); */ | |
155 | ||
156 | flags = claim_dma_lock(); | |
157 | disable_dma(chan); | |
158 | clear_dma_ff(chan); | |
159 | set_dma_mode(chan, dma_mode); | |
160 | set_dma_addr(chan, physaddr); | |
161 | set_dma_count(chan, count); | |
162 | enable_dma(chan); | |
163 | release_dma_lock(flags); | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
168 | static void dma_init_buffers(struct dma_buffparms *dmap) | |
169 | { | |
170 | dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0; | |
171 | dmap->byte_counter = 0; | |
172 | dmap->max_byte_counter = 8000 * 60 * 60; | |
173 | dmap->bytes_in_use = dmap->buffsize; | |
174 | ||
175 | dmap->dma_mode = DMODE_NONE; | |
176 | dmap->mapping_flags = 0; | |
177 | dmap->neutral_byte = 0x80; | |
178 | dmap->data_rate = 8000; | |
179 | dmap->cfrag = -1; | |
180 | dmap->closing = 0; | |
181 | dmap->nbufs = 1; | |
182 | dmap->flags = DMA_BUSY; /* Other flags off */ | |
183 | } | |
184 | ||
185 | static int open_dmap(struct audio_operations *adev, int mode, struct dma_buffparms *dmap) | |
186 | { | |
187 | int err; | |
188 | ||
189 | if (dmap->flags & DMA_BUSY) | |
190 | return -EBUSY; | |
191 | if ((err = sound_alloc_dmap(dmap)) < 0) | |
192 | return err; | |
193 | ||
194 | if (dmap->raw_buf == NULL) { | |
195 | printk(KERN_WARNING "Sound: DMA buffers not available\n"); | |
196 | return -ENOSPC; /* Memory allocation failed during boot */ | |
197 | } | |
198 | if (dmap->dma >= 0 && sound_open_dma(dmap->dma, adev->name)) { | |
199 | printk(KERN_WARNING "Unable to grab(2) DMA%d for the audio driver\n", dmap->dma); | |
200 | return -EBUSY; | |
201 | } | |
202 | dma_init_buffers(dmap); | |
203 | spin_lock_init(&dmap->lock); | |
204 | dmap->open_mode = mode; | |
205 | dmap->subdivision = dmap->underrun_count = 0; | |
206 | dmap->fragment_size = 0; | |
207 | dmap->max_fragments = 65536; /* Just a large value */ | |
208 | dmap->byte_counter = 0; | |
209 | dmap->max_byte_counter = 8000 * 60 * 60; | |
210 | dmap->applic_profile = APF_NORMAL; | |
211 | dmap->needs_reorg = 1; | |
212 | dmap->audio_callback = NULL; | |
213 | dmap->callback_parm = 0; | |
214 | return 0; | |
215 | } | |
216 | ||
217 | static void close_dmap(struct audio_operations *adev, struct dma_buffparms *dmap) | |
218 | { | |
219 | unsigned long flags; | |
220 | ||
221 | if (dmap->dma >= 0) { | |
222 | sound_close_dma(dmap->dma); | |
223 | flags=claim_dma_lock(); | |
224 | disable_dma(dmap->dma); | |
225 | release_dma_lock(flags); | |
226 | } | |
227 | if (dmap->flags & DMA_BUSY) | |
228 | dmap->dma_mode = DMODE_NONE; | |
229 | dmap->flags &= ~DMA_BUSY; | |
230 | ||
231 | if (sound_dmap_flag == DMAP_FREE_ON_CLOSE) | |
232 | sound_free_dmap(dmap); | |
233 | } | |
234 | ||
235 | ||
236 | static unsigned int default_set_bits(int dev, unsigned int bits) | |
237 | { | |
238 | mm_segment_t fs = get_fs(); | |
239 | ||
240 | set_fs(get_ds()); | |
241 | audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SETFMT, (void __user *)&bits); | |
242 | set_fs(fs); | |
243 | return bits; | |
244 | } | |
245 | ||
246 | static int default_set_speed(int dev, int speed) | |
247 | { | |
248 | mm_segment_t fs = get_fs(); | |
249 | ||
250 | set_fs(get_ds()); | |
251 | audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SPEED, (void __user *)&speed); | |
252 | set_fs(fs); | |
253 | return speed; | |
254 | } | |
255 | ||
256 | static short default_set_channels(int dev, short channels) | |
257 | { | |
258 | int c = channels; | |
259 | mm_segment_t fs = get_fs(); | |
260 | ||
261 | set_fs(get_ds()); | |
262 | audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_CHANNELS, (void __user *)&c); | |
263 | set_fs(fs); | |
264 | return c; | |
265 | } | |
266 | ||
267 | static void check_driver(struct audio_driver *d) | |
268 | { | |
269 | if (d->set_speed == NULL) | |
270 | d->set_speed = default_set_speed; | |
271 | if (d->set_bits == NULL) | |
272 | d->set_bits = default_set_bits; | |
273 | if (d->set_channels == NULL) | |
274 | d->set_channels = default_set_channels; | |
275 | } | |
276 | ||
277 | int DMAbuf_open(int dev, int mode) | |
278 | { | |
279 | struct audio_operations *adev = audio_devs[dev]; | |
280 | int retval; | |
281 | struct dma_buffparms *dmap_in = NULL; | |
282 | struct dma_buffparms *dmap_out = NULL; | |
283 | ||
284 | if (!adev) | |
285 | return -ENXIO; | |
286 | if (!(adev->flags & DMA_DUPLEX)) | |
287 | adev->dmap_in = adev->dmap_out; | |
288 | check_driver(adev->d); | |
289 | ||
290 | if ((retval = adev->d->open(dev, mode)) < 0) | |
291 | return retval; | |
292 | dmap_out = adev->dmap_out; | |
293 | dmap_in = adev->dmap_in; | |
294 | if (dmap_in == dmap_out) | |
295 | adev->flags &= ~DMA_DUPLEX; | |
296 | ||
297 | if (mode & OPEN_WRITE) { | |
298 | if ((retval = open_dmap(adev, mode, dmap_out)) < 0) { | |
299 | adev->d->close(dev); | |
300 | return retval; | |
301 | } | |
302 | } | |
303 | adev->enable_bits = mode; | |
304 | ||
305 | if (mode == OPEN_READ || (mode != OPEN_WRITE && (adev->flags & DMA_DUPLEX))) { | |
306 | if ((retval = open_dmap(adev, mode, dmap_in)) < 0) { | |
307 | adev->d->close(dev); | |
308 | if (mode & OPEN_WRITE) | |
309 | close_dmap(adev, dmap_out); | |
310 | return retval; | |
311 | } | |
312 | } | |
313 | adev->open_mode = mode; | |
314 | adev->go = 1; | |
315 | ||
316 | adev->d->set_bits(dev, 8); | |
317 | adev->d->set_channels(dev, 1); | |
318 | adev->d->set_speed(dev, DSP_DEFAULT_SPEED); | |
319 | if (adev->dmap_out->dma_mode == DMODE_OUTPUT) | |
320 | memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte, | |
321 | adev->dmap_out->bytes_in_use); | |
322 | return 0; | |
323 | } | |
324 | /* MUST not hold the spinlock */ | |
325 | void DMAbuf_reset(int dev) | |
326 | { | |
327 | if (audio_devs[dev]->open_mode & OPEN_WRITE) | |
328 | dma_reset_output(dev); | |
329 | ||
330 | if (audio_devs[dev]->open_mode & OPEN_READ) | |
331 | dma_reset_input(dev); | |
332 | } | |
333 | ||
334 | static void dma_reset_output(int dev) | |
335 | { | |
336 | struct audio_operations *adev = audio_devs[dev]; | |
337 | unsigned long flags,f ; | |
338 | struct dma_buffparms *dmap = adev->dmap_out; | |
339 | ||
340 | if (!(dmap->flags & DMA_STARTED)) /* DMA is not active */ | |
341 | return; | |
342 | ||
343 | /* | |
344 | * First wait until the current fragment has been played completely | |
345 | */ | |
346 | spin_lock_irqsave(&dmap->lock,flags); | |
347 | adev->dmap_out->flags |= DMA_SYNCING; | |
348 | ||
349 | adev->dmap_out->underrun_count = 0; | |
350 | if (!signal_pending(current) && adev->dmap_out->qlen && | |
351 | adev->dmap_out->underrun_count == 0){ | |
352 | spin_unlock_irqrestore(&dmap->lock,flags); | |
353 | interruptible_sleep_on_timeout(&adev->out_sleeper, | |
354 | dmabuf_timeout(dmap)); | |
355 | spin_lock_irqsave(&dmap->lock,flags); | |
356 | } | |
357 | adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE); | |
358 | ||
359 | /* | |
360 | * Finally shut the device off | |
361 | */ | |
362 | if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_output) | |
363 | adev->d->halt_io(dev); | |
364 | else | |
365 | adev->d->halt_output(dev); | |
366 | adev->dmap_out->flags &= ~DMA_STARTED; | |
367 | ||
368 | f=claim_dma_lock(); | |
369 | clear_dma_ff(dmap->dma); | |
370 | disable_dma(dmap->dma); | |
371 | release_dma_lock(f); | |
372 | ||
373 | dmap->byte_counter = 0; | |
374 | reorganize_buffers(dev, adev->dmap_out, 0); | |
375 | dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0; | |
376 | spin_unlock_irqrestore(&dmap->lock,flags); | |
377 | } | |
378 | ||
379 | static void dma_reset_input(int dev) | |
380 | { | |
381 | struct audio_operations *adev = audio_devs[dev]; | |
382 | unsigned long flags; | |
383 | struct dma_buffparms *dmap = adev->dmap_in; | |
384 | ||
385 | spin_lock_irqsave(&dmap->lock,flags); | |
386 | if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_input) | |
387 | adev->d->halt_io(dev); | |
388 | else | |
389 | adev->d->halt_input(dev); | |
390 | adev->dmap_in->flags &= ~DMA_STARTED; | |
391 | ||
392 | dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0; | |
393 | dmap->byte_counter = 0; | |
394 | reorganize_buffers(dev, adev->dmap_in, 1); | |
395 | spin_unlock_irqrestore(&dmap->lock,flags); | |
396 | } | |
397 | /* MUST be called with holding the dmap->lock */ | |
398 | void DMAbuf_launch_output(int dev, struct dma_buffparms *dmap) | |
399 | { | |
400 | struct audio_operations *adev = audio_devs[dev]; | |
401 | ||
402 | if (!((adev->enable_bits * adev->go) & PCM_ENABLE_OUTPUT)) | |
403 | return; /* Don't start DMA yet */ | |
404 | dmap->dma_mode = DMODE_OUTPUT; | |
405 | ||
406 | if (!(dmap->flags & DMA_ACTIVE) || !(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) { | |
407 | if (!(dmap->flags & DMA_STARTED)) { | |
408 | reorganize_buffers(dev, dmap, 0); | |
409 | if (adev->d->prepare_for_output(dev, dmap->fragment_size, dmap->nbufs)) | |
410 | return; | |
411 | if (!(dmap->flags & DMA_NODMA)) | |
412 | local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_WRITE); | |
413 | dmap->flags |= DMA_STARTED; | |
414 | } | |
415 | if (dmap->counts[dmap->qhead] == 0) | |
416 | dmap->counts[dmap->qhead] = dmap->fragment_size; | |
417 | dmap->dma_mode = DMODE_OUTPUT; | |
418 | adev->d->output_block(dev, dmap->raw_buf_phys + dmap->qhead * dmap->fragment_size, | |
419 | dmap->counts[dmap->qhead], 1); | |
420 | if (adev->d->trigger) | |
421 | adev->d->trigger(dev,adev->enable_bits * adev->go); | |
422 | } | |
423 | dmap->flags |= DMA_ACTIVE; | |
424 | } | |
425 | ||
426 | int DMAbuf_sync(int dev) | |
427 | { | |
428 | struct audio_operations *adev = audio_devs[dev]; | |
429 | unsigned long flags; | |
430 | int n = 0; | |
431 | struct dma_buffparms *dmap; | |
432 | ||
433 | if (!adev->go && !(adev->enable_bits & PCM_ENABLE_OUTPUT)) | |
434 | return 0; | |
435 | ||
436 | if (adev->dmap_out->dma_mode == DMODE_OUTPUT) { | |
437 | dmap = adev->dmap_out; | |
438 | spin_lock_irqsave(&dmap->lock,flags); | |
439 | if (dmap->qlen > 0 && !(dmap->flags & DMA_ACTIVE)) | |
440 | DMAbuf_launch_output(dev, dmap); | |
441 | adev->dmap_out->flags |= DMA_SYNCING; | |
442 | adev->dmap_out->underrun_count = 0; | |
1afa6e2e | 443 | while (!signal_pending(current) && n++ < adev->dmap_out->nbufs && |
1da177e4 LT |
444 | adev->dmap_out->qlen && adev->dmap_out->underrun_count == 0) { |
445 | long t = dmabuf_timeout(dmap); | |
446 | spin_unlock_irqrestore(&dmap->lock,flags); | |
447 | /* FIXME: not safe may miss events */ | |
448 | t = interruptible_sleep_on_timeout(&adev->out_sleeper, t); | |
449 | spin_lock_irqsave(&dmap->lock,flags); | |
450 | if (!t) { | |
451 | adev->dmap_out->flags &= ~DMA_SYNCING; | |
452 | spin_unlock_irqrestore(&dmap->lock,flags); | |
453 | return adev->dmap_out->qlen; | |
454 | } | |
455 | } | |
456 | adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE); | |
457 | ||
458 | /* | |
459 | * Some devices such as GUS have huge amount of on board RAM for the | |
460 | * audio data. We have to wait until the device has finished playing. | |
461 | */ | |
462 | ||
463 | /* still holding the lock */ | |
464 | if (adev->d->local_qlen) { /* Device has hidden buffers */ | |
465 | while (!signal_pending(current) && | |
466 | adev->d->local_qlen(dev)){ | |
467 | spin_unlock_irqrestore(&dmap->lock,flags); | |
468 | interruptible_sleep_on_timeout(&adev->out_sleeper, | |
469 | dmabuf_timeout(dmap)); | |
470 | spin_lock_irqsave(&dmap->lock,flags); | |
471 | } | |
472 | } | |
473 | spin_unlock_irqrestore(&dmap->lock,flags); | |
474 | } | |
475 | adev->dmap_out->dma_mode = DMODE_NONE; | |
476 | return adev->dmap_out->qlen; | |
477 | } | |
478 | ||
479 | int DMAbuf_release(int dev, int mode) | |
480 | { | |
481 | struct audio_operations *adev = audio_devs[dev]; | |
482 | struct dma_buffparms *dmap; | |
483 | unsigned long flags; | |
484 | ||
485 | dmap = adev->dmap_out; | |
486 | if (adev->open_mode & OPEN_WRITE) | |
487 | adev->dmap_out->closing = 1; | |
488 | ||
489 | if (adev->open_mode & OPEN_READ){ | |
490 | adev->dmap_in->closing = 1; | |
491 | dmap = adev->dmap_in; | |
492 | } | |
493 | if (adev->open_mode & OPEN_WRITE) | |
494 | if (!(adev->dmap_out->mapping_flags & DMA_MAP_MAPPED)) | |
495 | if (!signal_pending(current) && (adev->dmap_out->dma_mode == DMODE_OUTPUT)) | |
496 | DMAbuf_sync(dev); | |
497 | if (adev->dmap_out->dma_mode == DMODE_OUTPUT) | |
498 | memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte, adev->dmap_out->bytes_in_use); | |
499 | ||
500 | DMAbuf_reset(dev); | |
501 | spin_lock_irqsave(&dmap->lock,flags); | |
502 | adev->d->close(dev); | |
503 | ||
504 | if (adev->open_mode & OPEN_WRITE) | |
505 | close_dmap(adev, adev->dmap_out); | |
506 | ||
507 | if (adev->open_mode == OPEN_READ || | |
508 | (adev->open_mode != OPEN_WRITE && | |
509 | (adev->flags & DMA_DUPLEX))) | |
510 | close_dmap(adev, adev->dmap_in); | |
511 | adev->open_mode = 0; | |
512 | spin_unlock_irqrestore(&dmap->lock,flags); | |
513 | return 0; | |
514 | } | |
515 | /* called with dmap->lock dold */ | |
516 | int DMAbuf_activate_recording(int dev, struct dma_buffparms *dmap) | |
517 | { | |
518 | struct audio_operations *adev = audio_devs[dev]; | |
519 | int err; | |
520 | ||
521 | if (!(adev->open_mode & OPEN_READ)) | |
522 | return 0; | |
523 | if (!(adev->enable_bits & PCM_ENABLE_INPUT)) | |
524 | return 0; | |
525 | if (dmap->dma_mode == DMODE_OUTPUT) { /* Direction change */ | |
526 | /* release lock - it's not recursive */ | |
527 | spin_unlock_irq(&dmap->lock); | |
528 | DMAbuf_sync(dev); | |
529 | DMAbuf_reset(dev); | |
530 | spin_lock_irq(&dmap->lock); | |
531 | dmap->dma_mode = DMODE_NONE; | |
532 | } | |
533 | if (!dmap->dma_mode) { | |
534 | reorganize_buffers(dev, dmap, 1); | |
535 | if ((err = adev->d->prepare_for_input(dev, | |
536 | dmap->fragment_size, dmap->nbufs)) < 0) | |
537 | return err; | |
538 | dmap->dma_mode = DMODE_INPUT; | |
539 | } | |
540 | if (!(dmap->flags & DMA_ACTIVE)) { | |
541 | if (dmap->needs_reorg) | |
542 | reorganize_buffers(dev, dmap, 0); | |
543 | local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ); | |
544 | adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, | |
545 | dmap->fragment_size, 0); | |
546 | dmap->flags |= DMA_ACTIVE; | |
547 | if (adev->d->trigger) | |
548 | adev->d->trigger(dev, adev->enable_bits * adev->go); | |
549 | } | |
550 | return 0; | |
551 | } | |
0418726b | 552 | /* acquires lock */ |
1da177e4 LT |
553 | int DMAbuf_getrdbuffer(int dev, char **buf, int *len, int dontblock) |
554 | { | |
555 | struct audio_operations *adev = audio_devs[dev]; | |
556 | unsigned long flags; | |
557 | int err = 0, n = 0; | |
558 | struct dma_buffparms *dmap = adev->dmap_in; | |
559 | int go; | |
560 | ||
561 | if (!(adev->open_mode & OPEN_READ)) | |
562 | return -EIO; | |
563 | spin_lock_irqsave(&dmap->lock,flags); | |
564 | if (dmap->needs_reorg) | |
565 | reorganize_buffers(dev, dmap, 0); | |
566 | if (adev->dmap_in->mapping_flags & DMA_MAP_MAPPED) { | |
567 | /* printk(KERN_WARNING "Sound: Can't read from mmapped device (1)\n");*/ | |
568 | spin_unlock_irqrestore(&dmap->lock,flags); | |
569 | return -EINVAL; | |
570 | } else while (dmap->qlen <= 0 && n++ < 10) { | |
571 | long timeout = MAX_SCHEDULE_TIMEOUT; | |
572 | if (!(adev->enable_bits & PCM_ENABLE_INPUT) || !adev->go) { | |
573 | spin_unlock_irqrestore(&dmap->lock,flags); | |
574 | return -EAGAIN; | |
575 | } | |
576 | if ((err = DMAbuf_activate_recording(dev, dmap)) < 0) { | |
577 | spin_unlock_irqrestore(&dmap->lock,flags); | |
578 | return err; | |
579 | } | |
580 | /* Wait for the next block */ | |
581 | ||
582 | if (dontblock) { | |
583 | spin_unlock_irqrestore(&dmap->lock,flags); | |
584 | return -EAGAIN; | |
585 | } | |
586 | if ((go = adev->go)) | |
587 | timeout = dmabuf_timeout(dmap); | |
588 | ||
589 | spin_unlock_irqrestore(&dmap->lock,flags); | |
590 | timeout = interruptible_sleep_on_timeout(&adev->in_sleeper, | |
591 | timeout); | |
592 | if (!timeout) { | |
593 | /* FIXME: include device name */ | |
594 | err = -EIO; | |
595 | printk(KERN_WARNING "Sound: DMA (input) timed out - IRQ/DRQ config error?\n"); | |
596 | dma_reset_input(dev); | |
597 | } else | |
598 | err = -EINTR; | |
599 | spin_lock_irqsave(&dmap->lock,flags); | |
600 | } | |
601 | spin_unlock_irqrestore(&dmap->lock,flags); | |
602 | ||
603 | if (dmap->qlen <= 0) | |
604 | return err ? err : -EINTR; | |
605 | *buf = &dmap->raw_buf[dmap->qhead * dmap->fragment_size + dmap->counts[dmap->qhead]]; | |
606 | *len = dmap->fragment_size - dmap->counts[dmap->qhead]; | |
607 | ||
608 | return dmap->qhead; | |
609 | } | |
610 | ||
611 | int DMAbuf_rmchars(int dev, int buff_no, int c) | |
612 | { | |
613 | struct audio_operations *adev = audio_devs[dev]; | |
614 | struct dma_buffparms *dmap = adev->dmap_in; | |
615 | int p = dmap->counts[dmap->qhead] + c; | |
616 | ||
617 | if (dmap->mapping_flags & DMA_MAP_MAPPED) | |
618 | { | |
619 | /* printk("Sound: Can't read from mmapped device (2)\n");*/ | |
620 | return -EINVAL; | |
621 | } | |
622 | else if (dmap->qlen <= 0) | |
623 | return -EIO; | |
624 | else if (p >= dmap->fragment_size) { /* This buffer is completely empty */ | |
625 | dmap->counts[dmap->qhead] = 0; | |
626 | dmap->qlen--; | |
627 | dmap->qhead = (dmap->qhead + 1) % dmap->nbufs; | |
628 | } | |
629 | else dmap->counts[dmap->qhead] = p; | |
630 | ||
631 | return 0; | |
632 | } | |
633 | /* MUST be called with dmap->lock hold */ | |
634 | int DMAbuf_get_buffer_pointer(int dev, struct dma_buffparms *dmap, int direction) | |
635 | { | |
636 | /* | |
637 | * Try to approximate the active byte position of the DMA pointer within the | |
638 | * buffer area as well as possible. | |
639 | */ | |
640 | ||
641 | int pos; | |
642 | unsigned long f; | |
643 | ||
644 | if (!(dmap->flags & DMA_ACTIVE)) | |
645 | pos = 0; | |
646 | else { | |
647 | int chan = dmap->dma; | |
648 | ||
649 | f=claim_dma_lock(); | |
650 | clear_dma_ff(chan); | |
651 | ||
652 | if(!isa_dma_bridge_buggy) | |
653 | disable_dma(dmap->dma); | |
654 | ||
655 | pos = get_dma_residue(chan); | |
656 | ||
657 | pos = dmap->bytes_in_use - pos; | |
658 | ||
659 | if (!(dmap->mapping_flags & DMA_MAP_MAPPED)) { | |
660 | if (direction == DMODE_OUTPUT) { | |
661 | if (dmap->qhead == 0) | |
662 | if (pos > dmap->fragment_size) | |
663 | pos = 0; | |
664 | } else { | |
665 | if (dmap->qtail == 0) | |
666 | if (pos > dmap->fragment_size) | |
667 | pos = 0; | |
668 | } | |
669 | } | |
670 | if (pos < 0) | |
671 | pos = 0; | |
672 | if (pos >= dmap->bytes_in_use) | |
673 | pos = 0; | |
674 | ||
675 | if(!isa_dma_bridge_buggy) | |
676 | enable_dma(dmap->dma); | |
677 | ||
678 | release_dma_lock(f); | |
679 | } | |
680 | /* printk( "%04x ", pos); */ | |
681 | ||
682 | return pos; | |
683 | } | |
684 | ||
685 | /* | |
686 | * DMAbuf_start_devices() is called by the /dev/music driver to start | |
687 | * one or more audio devices at desired moment. | |
688 | */ | |
689 | ||
690 | void DMAbuf_start_devices(unsigned int devmask) | |
691 | { | |
692 | struct audio_operations *adev; | |
693 | int dev; | |
694 | ||
695 | for (dev = 0; dev < num_audiodevs; dev++) { | |
696 | if (!(devmask & (1 << dev))) | |
697 | continue; | |
698 | if (!(adev = audio_devs[dev])) | |
699 | continue; | |
700 | if (adev->open_mode == 0) | |
701 | continue; | |
702 | if (adev->go) | |
703 | continue; | |
704 | /* OK to start the device */ | |
705 | adev->go = 1; | |
706 | if (adev->d->trigger) | |
707 | adev->d->trigger(dev,adev->enable_bits * adev->go); | |
708 | } | |
709 | } | |
710 | /* via poll called without a lock ?*/ | |
711 | int DMAbuf_space_in_queue(int dev) | |
712 | { | |
713 | struct audio_operations *adev = audio_devs[dev]; | |
714 | int len, max, tmp; | |
715 | struct dma_buffparms *dmap = adev->dmap_out; | |
716 | int lim = dmap->nbufs; | |
717 | ||
718 | if (lim < 2) | |
719 | lim = 2; | |
720 | ||
721 | if (dmap->qlen >= lim) /* No space at all */ | |
722 | return 0; | |
723 | ||
724 | /* | |
725 | * Verify that there are no more pending buffers than the limit | |
726 | * defined by the process. | |
727 | */ | |
728 | ||
729 | max = dmap->max_fragments; | |
730 | if (max > lim) | |
731 | max = lim; | |
732 | len = dmap->qlen; | |
733 | ||
734 | if (adev->d->local_qlen) { | |
735 | tmp = adev->d->local_qlen(dev); | |
736 | if (tmp && len) | |
737 | tmp--; /* This buffer has been counted twice */ | |
738 | len += tmp; | |
739 | } | |
740 | if (dmap->byte_counter % dmap->fragment_size) /* There is a partial fragment */ | |
741 | len = len + 1; | |
742 | ||
743 | if (len >= max) | |
744 | return 0; | |
745 | return max - len; | |
746 | } | |
747 | /* MUST not hold the spinlock - this function may sleep */ | |
748 | static int output_sleep(int dev, int dontblock) | |
749 | { | |
750 | struct audio_operations *adev = audio_devs[dev]; | |
751 | int err = 0; | |
752 | struct dma_buffparms *dmap = adev->dmap_out; | |
753 | long timeout; | |
754 | long timeout_value; | |
755 | ||
756 | if (dontblock) | |
757 | return -EAGAIN; | |
758 | if (!(adev->enable_bits & PCM_ENABLE_OUTPUT)) | |
759 | return -EAGAIN; | |
760 | ||
761 | /* | |
762 | * Wait for free space | |
763 | */ | |
764 | if (signal_pending(current)) | |
765 | return -EINTR; | |
766 | timeout = (adev->go && !(dmap->flags & DMA_NOTIMEOUT)); | |
767 | if (timeout) | |
768 | timeout_value = dmabuf_timeout(dmap); | |
769 | else | |
770 | timeout_value = MAX_SCHEDULE_TIMEOUT; | |
771 | timeout_value = interruptible_sleep_on_timeout(&adev->out_sleeper, | |
772 | timeout_value); | |
773 | if (timeout != MAX_SCHEDULE_TIMEOUT && !timeout_value) { | |
774 | printk(KERN_WARNING "Sound: DMA (output) timed out - IRQ/DRQ config error?\n"); | |
775 | dma_reset_output(dev); | |
776 | } else { | |
777 | if (signal_pending(current)) | |
778 | err = -EINTR; | |
779 | } | |
780 | return err; | |
781 | } | |
782 | /* called with the lock held */ | |
783 | static int find_output_space(int dev, char **buf, int *size) | |
784 | { | |
785 | struct audio_operations *adev = audio_devs[dev]; | |
786 | struct dma_buffparms *dmap = adev->dmap_out; | |
787 | unsigned long active_offs; | |
788 | long len, offs; | |
789 | int maxfrags; | |
790 | int occupied_bytes = (dmap->user_counter % dmap->fragment_size); | |
791 | ||
792 | *buf = dmap->raw_buf; | |
793 | if (!(maxfrags = DMAbuf_space_in_queue(dev)) && !occupied_bytes) | |
794 | return 0; | |
795 | ||
796 | #ifdef BE_CONSERVATIVE | |
797 | active_offs = dmap->byte_counter + dmap->qhead * dmap->fragment_size; | |
798 | #else | |
0d52cea4 | 799 | active_offs = max(DMAbuf_get_buffer_pointer(dev, dmap, DMODE_OUTPUT), 0); |
1da177e4 | 800 | /* Check for pointer wrapping situation */ |
0d52cea4 | 801 | if (active_offs >= dmap->bytes_in_use) |
1da177e4 LT |
802 | active_offs = 0; |
803 | active_offs += dmap->byte_counter; | |
804 | #endif | |
805 | ||
806 | offs = (dmap->user_counter % dmap->bytes_in_use) & ~SAMPLE_ROUNDUP; | |
807 | if (offs < 0 || offs >= dmap->bytes_in_use) { | |
808 | printk(KERN_ERR "Sound: Got unexpected offs %ld. Giving up.\n", offs); | |
809 | printk("Counter = %ld, bytes=%d\n", dmap->user_counter, dmap->bytes_in_use); | |
810 | return 0; | |
811 | } | |
812 | *buf = dmap->raw_buf + offs; | |
813 | ||
814 | len = active_offs + dmap->bytes_in_use - dmap->user_counter; /* Number of unused bytes in buffer */ | |
815 | ||
816 | if ((offs + len) > dmap->bytes_in_use) | |
817 | len = dmap->bytes_in_use - offs; | |
818 | if (len < 0) { | |
819 | return 0; | |
820 | } | |
821 | if (len > ((maxfrags * dmap->fragment_size) - occupied_bytes)) | |
822 | len = (maxfrags * dmap->fragment_size) - occupied_bytes; | |
823 | *size = len & ~SAMPLE_ROUNDUP; | |
824 | return (*size > 0); | |
825 | } | |
0418726b | 826 | /* acquires lock */ |
1da177e4 LT |
827 | int DMAbuf_getwrbuffer(int dev, char **buf, int *size, int dontblock) |
828 | { | |
829 | struct audio_operations *adev = audio_devs[dev]; | |
830 | unsigned long flags; | |
831 | int err = -EIO; | |
832 | struct dma_buffparms *dmap = adev->dmap_out; | |
833 | ||
834 | if (dmap->mapping_flags & DMA_MAP_MAPPED) { | |
835 | /* printk(KERN_DEBUG "Sound: Can't write to mmapped device (3)\n");*/ | |
836 | return -EINVAL; | |
837 | } | |
838 | spin_lock_irqsave(&dmap->lock,flags); | |
839 | if (dmap->needs_reorg) | |
840 | reorganize_buffers(dev, dmap, 0); | |
841 | ||
842 | if (dmap->dma_mode == DMODE_INPUT) { /* Direction change */ | |
843 | spin_unlock_irqrestore(&dmap->lock,flags); | |
844 | DMAbuf_reset(dev); | |
845 | spin_lock_irqsave(&dmap->lock,flags); | |
846 | } | |
847 | dmap->dma_mode = DMODE_OUTPUT; | |
848 | ||
849 | while (find_output_space(dev, buf, size) <= 0) { | |
850 | spin_unlock_irqrestore(&dmap->lock,flags); | |
851 | if ((err = output_sleep(dev, dontblock)) < 0) { | |
852 | return err; | |
853 | } | |
854 | spin_lock_irqsave(&dmap->lock,flags); | |
855 | } | |
856 | ||
857 | spin_unlock_irqrestore(&dmap->lock,flags); | |
858 | return 0; | |
859 | } | |
0418726b | 860 | /* has to acquire dmap->lock */ |
1da177e4 LT |
861 | int DMAbuf_move_wrpointer(int dev, int l) |
862 | { | |
863 | struct audio_operations *adev = audio_devs[dev]; | |
864 | struct dma_buffparms *dmap = adev->dmap_out; | |
865 | unsigned long ptr; | |
866 | unsigned long end_ptr, p; | |
867 | int post; | |
868 | unsigned long flags; | |
869 | ||
870 | spin_lock_irqsave(&dmap->lock,flags); | |
871 | post= (dmap->flags & DMA_POST); | |
872 | ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size; | |
873 | ||
874 | dmap->flags &= ~DMA_POST; | |
875 | dmap->cfrag = -1; | |
876 | dmap->user_counter += l; | |
877 | dmap->flags |= DMA_DIRTY; | |
878 | ||
879 | if (dmap->byte_counter >= dmap->max_byte_counter) { | |
880 | /* Wrap the byte counters */ | |
881 | long decr = dmap->byte_counter; | |
882 | dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use); | |
883 | decr -= dmap->byte_counter; | |
884 | dmap->user_counter -= decr; | |
885 | } | |
886 | end_ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size; | |
887 | ||
888 | p = (dmap->user_counter - 1) % dmap->bytes_in_use; | |
889 | dmap->neutral_byte = dmap->raw_buf[p]; | |
890 | ||
891 | /* Update the fragment based bookkeeping too */ | |
892 | while (ptr < end_ptr) { | |
893 | dmap->counts[dmap->qtail] = dmap->fragment_size; | |
894 | dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; | |
895 | dmap->qlen++; | |
896 | ptr += dmap->fragment_size; | |
897 | } | |
898 | ||
899 | dmap->counts[dmap->qtail] = dmap->user_counter - ptr; | |
900 | ||
901 | /* | |
902 | * Let the low level driver perform some postprocessing to | |
903 | * the written data. | |
904 | */ | |
905 | if (adev->d->postprocess_write) | |
906 | adev->d->postprocess_write(dev); | |
907 | ||
908 | if (!(dmap->flags & DMA_ACTIVE)) | |
909 | if (dmap->qlen > 1 || (dmap->qlen > 0 && (post || dmap->qlen >= dmap->nbufs - 1))) | |
910 | DMAbuf_launch_output(dev, dmap); | |
911 | ||
912 | spin_unlock_irqrestore(&dmap->lock,flags); | |
913 | return 0; | |
914 | } | |
915 | ||
916 | int DMAbuf_start_dma(int dev, unsigned long physaddr, int count, int dma_mode) | |
917 | { | |
918 | struct audio_operations *adev = audio_devs[dev]; | |
919 | struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in; | |
920 | ||
921 | if (dmap->raw_buf == NULL) { | |
922 | printk(KERN_ERR "sound: DMA buffer(1) == NULL\n"); | |
923 | printk("Device %d, chn=%s\n", dev, (dmap == adev->dmap_out) ? "out" : "in"); | |
924 | return 0; | |
925 | } | |
926 | if (dmap->dma < 0) | |
927 | return 0; | |
928 | sound_start_dma(dmap, physaddr, count, dma_mode); | |
929 | return count; | |
930 | } | |
ece7f77b | 931 | EXPORT_SYMBOL(DMAbuf_start_dma); |
1da177e4 LT |
932 | |
933 | static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode) | |
934 | { | |
935 | struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in; | |
936 | ||
937 | if (dmap->raw_buf == NULL) { | |
938 | printk(KERN_ERR "sound: DMA buffer(2) == NULL\n"); | |
939 | printk(KERN_ERR "Device %s, chn=%s\n", adev->name, (dmap == adev->dmap_out) ? "out" : "in"); | |
940 | return 0; | |
941 | } | |
942 | if (dmap->flags & DMA_NODMA) | |
943 | return 1; | |
944 | if (dmap->dma < 0) | |
945 | return 0; | |
946 | sound_start_dma(dmap, dmap->raw_buf_phys, dmap->bytes_in_use, dma_mode | DMA_AUTOINIT); | |
947 | dmap->flags |= DMA_STARTED; | |
948 | return count; | |
949 | } | |
950 | ||
951 | static void finish_output_interrupt(int dev, struct dma_buffparms *dmap) | |
952 | { | |
953 | struct audio_operations *adev = audio_devs[dev]; | |
954 | ||
955 | if (dmap->audio_callback != NULL) | |
956 | dmap->audio_callback(dev, dmap->callback_parm); | |
957 | wake_up(&adev->out_sleeper); | |
958 | wake_up(&adev->poll_sleeper); | |
959 | } | |
960 | /* called with dmap->lock held in irq context*/ | |
961 | static void do_outputintr(int dev, int dummy) | |
962 | { | |
963 | struct audio_operations *adev = audio_devs[dev]; | |
964 | struct dma_buffparms *dmap = adev->dmap_out; | |
965 | int this_fragment; | |
966 | ||
967 | if (dmap->raw_buf == NULL) { | |
968 | printk(KERN_ERR "Sound: Error. Audio interrupt (%d) after freeing buffers.\n", dev); | |
969 | return; | |
970 | } | |
971 | if (dmap->mapping_flags & DMA_MAP_MAPPED) { /* Virtual memory mapped access */ | |
972 | /* mmapped access */ | |
973 | dmap->qhead = (dmap->qhead + 1) % dmap->nbufs; | |
974 | if (dmap->qhead == 0) { /* Wrapped */ | |
975 | dmap->byte_counter += dmap->bytes_in_use; | |
976 | if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */ | |
977 | long decr = dmap->byte_counter; | |
978 | dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use); | |
979 | decr -= dmap->byte_counter; | |
980 | dmap->user_counter -= decr; | |
981 | } | |
982 | } | |
983 | dmap->qlen++; /* Yes increment it (don't decrement) */ | |
984 | if (!(adev->flags & DMA_AUTOMODE)) | |
985 | dmap->flags &= ~DMA_ACTIVE; | |
986 | dmap->counts[dmap->qhead] = dmap->fragment_size; | |
987 | DMAbuf_launch_output(dev, dmap); | |
988 | finish_output_interrupt(dev, dmap); | |
989 | return; | |
990 | } | |
991 | ||
992 | dmap->qlen--; | |
993 | this_fragment = dmap->qhead; | |
994 | dmap->qhead = (dmap->qhead + 1) % dmap->nbufs; | |
995 | ||
996 | if (dmap->qhead == 0) { /* Wrapped */ | |
997 | dmap->byte_counter += dmap->bytes_in_use; | |
998 | if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */ | |
999 | long decr = dmap->byte_counter; | |
1000 | dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use); | |
1001 | decr -= dmap->byte_counter; | |
1002 | dmap->user_counter -= decr; | |
1003 | } | |
1004 | } | |
1005 | if (!(adev->flags & DMA_AUTOMODE)) | |
1006 | dmap->flags &= ~DMA_ACTIVE; | |
1007 | ||
1008 | /* | |
1009 | * This is dmap->qlen <= 0 except when closing when | |
1010 | * dmap->qlen < 0 | |
1011 | */ | |
1012 | ||
1013 | while (dmap->qlen <= -dmap->closing) { | |
1014 | dmap->underrun_count++; | |
1015 | dmap->qlen++; | |
1016 | if ((dmap->flags & DMA_DIRTY) && dmap->applic_profile != APF_CPUINTENS) { | |
1017 | dmap->flags &= ~DMA_DIRTY; | |
1018 | memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte, | |
1019 | adev->dmap_out->buffsize); | |
1020 | } | |
1021 | dmap->user_counter += dmap->fragment_size; | |
1022 | dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; | |
1023 | } | |
1024 | if (dmap->qlen > 0) | |
1025 | DMAbuf_launch_output(dev, dmap); | |
1026 | finish_output_interrupt(dev, dmap); | |
1027 | } | |
1028 | /* called in irq context */ | |
1029 | void DMAbuf_outputintr(int dev, int notify_only) | |
1030 | { | |
1031 | struct audio_operations *adev = audio_devs[dev]; | |
1032 | unsigned long flags; | |
1033 | struct dma_buffparms *dmap = adev->dmap_out; | |
1034 | ||
1035 | spin_lock_irqsave(&dmap->lock,flags); | |
1036 | if (!(dmap->flags & DMA_NODMA)) { | |
1037 | int chan = dmap->dma, pos, n; | |
1038 | unsigned long f; | |
1039 | ||
1040 | f=claim_dma_lock(); | |
1041 | ||
1042 | if(!isa_dma_bridge_buggy) | |
1043 | disable_dma(dmap->dma); | |
1044 | clear_dma_ff(chan); | |
1045 | pos = dmap->bytes_in_use - get_dma_residue(chan); | |
1046 | if(!isa_dma_bridge_buggy) | |
1047 | enable_dma(dmap->dma); | |
1048 | release_dma_lock(f); | |
1049 | ||
1050 | pos = pos / dmap->fragment_size; /* Actual qhead */ | |
1051 | if (pos < 0 || pos >= dmap->nbufs) | |
1052 | pos = 0; | |
1053 | n = 0; | |
1054 | while (dmap->qhead != pos && n++ < dmap->nbufs) | |
1055 | do_outputintr(dev, notify_only); | |
1056 | } | |
1057 | else | |
1058 | do_outputintr(dev, notify_only); | |
1059 | spin_unlock_irqrestore(&dmap->lock,flags); | |
1060 | } | |
ece7f77b AB |
1061 | EXPORT_SYMBOL(DMAbuf_outputintr); |
1062 | ||
1da177e4 LT |
1063 | /* called with dmap->lock held in irq context */ |
1064 | static void do_inputintr(int dev) | |
1065 | { | |
1066 | struct audio_operations *adev = audio_devs[dev]; | |
1067 | struct dma_buffparms *dmap = adev->dmap_in; | |
1068 | ||
1069 | if (dmap->raw_buf == NULL) { | |
1070 | printk(KERN_ERR "Sound: Fatal error. Audio interrupt after freeing buffers.\n"); | |
1071 | return; | |
1072 | } | |
1073 | if (dmap->mapping_flags & DMA_MAP_MAPPED) { | |
1074 | dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; | |
1075 | if (dmap->qtail == 0) { /* Wrapped */ | |
1076 | dmap->byte_counter += dmap->bytes_in_use; | |
1077 | if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */ | |
1078 | long decr = dmap->byte_counter; | |
1079 | dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use; | |
1080 | decr -= dmap->byte_counter; | |
1081 | dmap->user_counter -= decr; | |
1082 | } | |
1083 | } | |
1084 | dmap->qlen++; | |
1085 | ||
1086 | if (!(adev->flags & DMA_AUTOMODE)) { | |
1087 | if (dmap->needs_reorg) | |
1088 | reorganize_buffers(dev, dmap, 0); | |
1089 | local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_READ); | |
1090 | adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, | |
1091 | dmap->fragment_size, 1); | |
1092 | if (adev->d->trigger) | |
1093 | adev->d->trigger(dev, adev->enable_bits * adev->go); | |
1094 | } | |
1095 | dmap->flags |= DMA_ACTIVE; | |
1096 | } else if (dmap->qlen >= (dmap->nbufs - 1)) { | |
1097 | printk(KERN_WARNING "Sound: Recording overrun\n"); | |
1098 | dmap->underrun_count++; | |
1099 | ||
1100 | /* Just throw away the oldest fragment but keep the engine running */ | |
1101 | dmap->qhead = (dmap->qhead + 1) % dmap->nbufs; | |
1102 | dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; | |
1103 | } else if (dmap->qlen >= 0 && dmap->qlen < dmap->nbufs) { | |
1104 | dmap->qlen++; | |
1105 | dmap->qtail = (dmap->qtail + 1) % dmap->nbufs; | |
1106 | if (dmap->qtail == 0) { /* Wrapped */ | |
1107 | dmap->byte_counter += dmap->bytes_in_use; | |
1108 | if (dmap->byte_counter >= dmap->max_byte_counter) { /* Overflow */ | |
1109 | long decr = dmap->byte_counter; | |
1110 | dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use; | |
1111 | decr -= dmap->byte_counter; | |
1112 | dmap->user_counter -= decr; | |
1113 | } | |
1114 | } | |
1115 | } | |
1116 | if (!(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) { | |
1117 | local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ); | |
1118 | adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, dmap->fragment_size, 1); | |
1119 | if (adev->d->trigger) | |
1120 | adev->d->trigger(dev,adev->enable_bits * adev->go); | |
1121 | } | |
1122 | dmap->flags |= DMA_ACTIVE; | |
1123 | if (dmap->qlen > 0) | |
1124 | { | |
1125 | wake_up(&adev->in_sleeper); | |
1126 | wake_up(&adev->poll_sleeper); | |
1127 | } | |
1128 | } | |
1129 | /* called in irq context */ | |
1130 | void DMAbuf_inputintr(int dev) | |
1131 | { | |
1132 | struct audio_operations *adev = audio_devs[dev]; | |
1133 | struct dma_buffparms *dmap = adev->dmap_in; | |
1134 | unsigned long flags; | |
1135 | ||
1136 | spin_lock_irqsave(&dmap->lock,flags); | |
1137 | ||
1138 | if (!(dmap->flags & DMA_NODMA)) { | |
1139 | int chan = dmap->dma, pos, n; | |
1140 | unsigned long f; | |
1141 | ||
1142 | f=claim_dma_lock(); | |
1143 | if(!isa_dma_bridge_buggy) | |
1144 | disable_dma(dmap->dma); | |
1145 | clear_dma_ff(chan); | |
1146 | pos = dmap->bytes_in_use - get_dma_residue(chan); | |
1147 | if(!isa_dma_bridge_buggy) | |
1148 | enable_dma(dmap->dma); | |
1149 | release_dma_lock(f); | |
1150 | ||
1151 | pos = pos / dmap->fragment_size; /* Actual qhead */ | |
1152 | if (pos < 0 || pos >= dmap->nbufs) | |
1153 | pos = 0; | |
1154 | ||
1155 | n = 0; | |
1156 | while (dmap->qtail != pos && ++n < dmap->nbufs) | |
1157 | do_inputintr(dev); | |
1158 | } else | |
1159 | do_inputintr(dev); | |
1160 | spin_unlock_irqrestore(&dmap->lock,flags); | |
1161 | } | |
ece7f77b | 1162 | EXPORT_SYMBOL(DMAbuf_inputintr); |
1da177e4 | 1163 | |
1da177e4 LT |
1164 | void DMAbuf_init(int dev, int dma1, int dma2) |
1165 | { | |
1166 | struct audio_operations *adev = audio_devs[dev]; | |
1167 | /* | |
1168 | * NOTE! This routine could be called several times. | |
1169 | */ | |
1170 | ||
1da177e4 LT |
1171 | if (adev && adev->dmap_out == NULL) { |
1172 | if (adev->d == NULL) | |
1173 | panic("OSS: audio_devs[%d]->d == NULL\n", dev); | |
1174 | ||
1175 | if (adev->parent_dev) { /* Use DMA map of the parent dev */ | |
1176 | int parent = adev->parent_dev - 1; | |
1177 | adev->dmap_out = audio_devs[parent]->dmap_out; | |
1178 | adev->dmap_in = audio_devs[parent]->dmap_in; | |
1179 | } else { | |
1180 | adev->dmap_out = adev->dmap_in = &adev->dmaps[0]; | |
1181 | adev->dmap_out->dma = dma1; | |
1182 | if (adev->flags & DMA_DUPLEX) { | |
1183 | adev->dmap_in = &adev->dmaps[1]; | |
1184 | adev->dmap_in->dma = dma2; | |
1185 | } | |
1186 | } | |
1187 | /* Persistent DMA buffers allocated here */ | |
1188 | if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) { | |
1189 | if (adev->dmap_in->raw_buf == NULL) | |
1190 | sound_alloc_dmap(adev->dmap_in); | |
1191 | if (adev->dmap_out->raw_buf == NULL) | |
1192 | sound_alloc_dmap(adev->dmap_out); | |
1193 | } | |
1194 | } | |
1195 | } | |
1196 | ||
1197 | /* No kernel lock - DMAbuf_activate_recording protected by global cli/sti */ | |
1198 | static unsigned int poll_input(struct file * file, int dev, poll_table *wait) | |
1199 | { | |
1200 | struct audio_operations *adev = audio_devs[dev]; | |
1201 | struct dma_buffparms *dmap = adev->dmap_in; | |
1202 | ||
1203 | if (!(adev->open_mode & OPEN_READ)) | |
1204 | return 0; | |
1205 | if (dmap->mapping_flags & DMA_MAP_MAPPED) { | |
1206 | if (dmap->qlen) | |
1207 | return POLLIN | POLLRDNORM; | |
1208 | return 0; | |
1209 | } | |
1210 | if (dmap->dma_mode != DMODE_INPUT) { | |
1211 | if (dmap->dma_mode == DMODE_NONE && | |
1212 | adev->enable_bits & PCM_ENABLE_INPUT && | |
1213 | !dmap->qlen && adev->go) { | |
1214 | unsigned long flags; | |
1215 | ||
1216 | spin_lock_irqsave(&dmap->lock,flags); | |
1217 | DMAbuf_activate_recording(dev, dmap); | |
1218 | spin_unlock_irqrestore(&dmap->lock,flags); | |
1219 | } | |
1220 | return 0; | |
1221 | } | |
1222 | if (!dmap->qlen) | |
1223 | return 0; | |
1224 | return POLLIN | POLLRDNORM; | |
1225 | } | |
1226 | ||
1227 | static unsigned int poll_output(struct file * file, int dev, poll_table *wait) | |
1228 | { | |
1229 | struct audio_operations *adev = audio_devs[dev]; | |
1230 | struct dma_buffparms *dmap = adev->dmap_out; | |
1231 | ||
1232 | if (!(adev->open_mode & OPEN_WRITE)) | |
1233 | return 0; | |
1234 | if (dmap->mapping_flags & DMA_MAP_MAPPED) { | |
1235 | if (dmap->qlen) | |
1236 | return POLLOUT | POLLWRNORM; | |
1237 | return 0; | |
1238 | } | |
1239 | if (dmap->dma_mode == DMODE_INPUT) | |
1240 | return 0; | |
1241 | if (dmap->dma_mode == DMODE_NONE) | |
1242 | return POLLOUT | POLLWRNORM; | |
1243 | if (!DMAbuf_space_in_queue(dev)) | |
1244 | return 0; | |
1245 | return POLLOUT | POLLWRNORM; | |
1246 | } | |
1247 | ||
1248 | unsigned int DMAbuf_poll(struct file * file, int dev, poll_table *wait) | |
1249 | { | |
1250 | struct audio_operations *adev = audio_devs[dev]; | |
1251 | poll_wait(file, &adev->poll_sleeper, wait); | |
1252 | return poll_input(file, dev, wait) | poll_output(file, dev, wait); | |
1253 | } | |
1254 | ||
1255 | void DMAbuf_deinit(int dev) | |
1256 | { | |
1257 | struct audio_operations *adev = audio_devs[dev]; | |
1258 | /* This routine is called when driver is being unloaded */ | |
1259 | if (!adev) | |
1260 | return; | |
1261 | ||
1262 | /* Persistent DMA buffers deallocated here */ | |
1263 | if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) { | |
1264 | sound_free_dmap(adev->dmap_out); | |
1265 | if (adev->flags & DMA_DUPLEX) | |
1266 | sound_free_dmap(adev->dmap_in); | |
1267 | } | |
1268 | } |