aboutsummaryrefslogtreecommitdiffstats
path: root/sound/aoa/soundbus/i2sbus/i2sbus-pcm.c
diff options
context:
space:
mode:
Diffstat (limited to 'sound/aoa/soundbus/i2sbus/i2sbus-pcm.c')
-rw-r--r--sound/aoa/soundbus/i2sbus/i2sbus-pcm.c1021
1 files changed, 1021 insertions, 0 deletions
diff --git a/sound/aoa/soundbus/i2sbus/i2sbus-pcm.c b/sound/aoa/soundbus/i2sbus/i2sbus-pcm.c
new file mode 100644
index 000000000000..3049015a04f1
--- /dev/null
+++ b/sound/aoa/soundbus/i2sbus/i2sbus-pcm.c
@@ -0,0 +1,1021 @@
1/*
2 * i2sbus driver -- pcm routines
3 *
4 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
5 *
6 * GPL v2, can be found in COPYING.
7 */
8
9#include <asm/io.h>
10#include <linux/delay.h>
11/* So apparently there's a reason for requiring driver.h
12 * to be included first, even if I don't know it... */
13#include <sound/driver.h>
14#include <sound/core.h>
15#include <asm/macio.h>
16#include <linux/pci.h>
17#include "../soundbus.h"
18#include "i2sbus.h"
19
20static inline void get_pcm_info(struct i2sbus_dev *i2sdev, int in,
21 struct pcm_info **pi, struct pcm_info **other)
22{
23 if (in) {
24 if (pi)
25 *pi = &i2sdev->in;
26 if (other)
27 *other = &i2sdev->out;
28 } else {
29 if (pi)
30 *pi = &i2sdev->out;
31 if (other)
32 *other = &i2sdev->in;
33 }
34}
35
36static int clock_and_divisors(int mclk, int sclk, int rate, int *out)
37{
38 /* sclk must be derived from mclk! */
39 if (mclk % sclk)
40 return -1;
41 /* derive sclk register value */
42 if (i2s_sf_sclkdiv(mclk / sclk, out))
43 return -1;
44
45 if (I2S_CLOCK_SPEED_18MHz % (rate * mclk) == 0) {
46 if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_18MHz / (rate * mclk), out)) {
47 *out |= I2S_SF_CLOCK_SOURCE_18MHz;
48 return 0;
49 }
50 }
51 if (I2S_CLOCK_SPEED_45MHz % (rate * mclk) == 0) {
52 if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_45MHz / (rate * mclk), out)) {
53 *out |= I2S_SF_CLOCK_SOURCE_45MHz;
54 return 0;
55 }
56 }
57 if (I2S_CLOCK_SPEED_49MHz % (rate * mclk) == 0) {
58 if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_49MHz / (rate * mclk), out)) {
59 *out |= I2S_SF_CLOCK_SOURCE_49MHz;
60 return 0;
61 }
62 }
63 return -1;
64}
65
66#define CHECK_RATE(rate) \
67 do { if (rates & SNDRV_PCM_RATE_ ##rate) { \
68 int dummy; \
69 if (clock_and_divisors(sysclock_factor, \
70 bus_factor, rate, &dummy)) \
71 rates &= ~SNDRV_PCM_RATE_ ##rate; \
72 } } while (0)
73
74static int i2sbus_pcm_open(struct i2sbus_dev *i2sdev, int in)
75{
76 struct pcm_info *pi, *other;
77 struct soundbus_dev *sdev;
78 int masks_inited = 0, err;
79 struct codec_info_item *cii, *rev;
80 struct snd_pcm_hardware *hw;
81 u64 formats = 0;
82 unsigned int rates = 0;
83 struct transfer_info v;
84 int result = 0;
85 int bus_factor = 0, sysclock_factor = 0;
86 int found_this;
87
88 mutex_lock(&i2sdev->lock);
89
90 get_pcm_info(i2sdev, in, &pi, &other);
91
92 hw = &pi->substream->runtime->hw;
93 sdev = &i2sdev->sound;
94
95 if (pi->active) {
96 /* alsa messed up */
97 result = -EBUSY;
98 goto out_unlock;
99 }
100
101 /* we now need to assign the hw */
102 list_for_each_entry(cii, &sdev->codec_list, list) {
103 struct transfer_info *ti = cii->codec->transfers;
104 bus_factor = cii->codec->bus_factor;
105 sysclock_factor = cii->codec->sysclock_factor;
106 while (ti->formats && ti->rates) {
107 v = *ti;
108 if (ti->transfer_in == in
109 && cii->codec->usable(cii, ti, &v)) {
110 if (masks_inited) {
111 formats &= v.formats;
112 rates &= v.rates;
113 } else {
114 formats = v.formats;
115 rates = v.rates;
116 masks_inited = 1;
117 }
118 }
119 ti++;
120 }
121 }
122 if (!masks_inited || !bus_factor || !sysclock_factor) {
123 result = -ENODEV;
124 goto out_unlock;
125 }
126 /* bus dependent stuff */
127 hw->info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
128 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_RESUME;
129
130 CHECK_RATE(5512);
131 CHECK_RATE(8000);
132 CHECK_RATE(11025);
133 CHECK_RATE(16000);
134 CHECK_RATE(22050);
135 CHECK_RATE(32000);
136 CHECK_RATE(44100);
137 CHECK_RATE(48000);
138 CHECK_RATE(64000);
139 CHECK_RATE(88200);
140 CHECK_RATE(96000);
141 CHECK_RATE(176400);
142 CHECK_RATE(192000);
143 hw->rates = rates;
144
145 /* well. the codec might want 24 bits only, and we'll
146 * ever only transfer 24 bits, but they are top-aligned!
147 * So for alsa, we claim that we're doing full 32 bit
148 * while in reality we'll ignore the lower 8 bits of
149 * that when doing playback (they're transferred as 0
150 * as far as I know, no codecs we have are 32-bit capable
151 * so I can't really test) and when doing recording we'll
152 * always have those lower 8 bits recorded as 0 */
153 if (formats & SNDRV_PCM_FMTBIT_S24_BE)
154 formats |= SNDRV_PCM_FMTBIT_S32_BE;
155 if (formats & SNDRV_PCM_FMTBIT_U24_BE)
156 formats |= SNDRV_PCM_FMTBIT_U32_BE;
157 /* now mask off what we can support. I suppose we could
158 * also support S24_3LE and some similar formats, but I
159 * doubt there's a codec that would be able to use that,
160 * so we don't support it here. */
161 hw->formats = formats & (SNDRV_PCM_FMTBIT_S16_BE |
162 SNDRV_PCM_FMTBIT_U16_BE |
163 SNDRV_PCM_FMTBIT_S32_BE |
164 SNDRV_PCM_FMTBIT_U32_BE);
165
166 /* we need to set the highest and lowest rate possible.
167 * These are the highest and lowest rates alsa can
168 * support properly in its bitfield.
169 * Below, we'll use that to restrict to the rate
170 * currently in use (if any). */
171 hw->rate_min = 5512;
172 hw->rate_max = 192000;
173 /* if the other stream is active, then we can only
174 * support what it is currently using.
175 * FIXME: I lied. This comment is wrong. We can support
176 * anything that works with the same serial format, ie.
177 * when recording 24 bit sound we can well play 16 bit
178 * sound at the same time iff using the same transfer mode.
179 */
180 if (other->active) {
181 /* FIXME: is this guaranteed by the alsa api? */
182 hw->formats &= (1ULL << i2sdev->format);
183 /* see above, restrict rates to the one we already have */
184 hw->rate_min = i2sdev->rate;
185 hw->rate_max = i2sdev->rate;
186 }
187
188 hw->channels_min = 2;
189 hw->channels_max = 2;
190 /* these are somewhat arbitrary */
191 hw->buffer_bytes_max = 131072;
192 hw->period_bytes_min = 256;
193 hw->period_bytes_max = 16384;
194 hw->periods_min = 3;
195 hw->periods_max = MAX_DBDMA_COMMANDS;
196 list_for_each_entry(cii, &sdev->codec_list, list) {
197 if (cii->codec->open) {
198 err = cii->codec->open(cii, pi->substream);
199 if (err) {
200 result = err;
201 /* unwind */
202 found_this = 0;
203 list_for_each_entry_reverse(rev,
204 &sdev->codec_list, list) {
205 if (found_this && rev->codec->close) {
206 rev->codec->close(rev,
207 pi->substream);
208 }
209 if (rev == cii)
210 found_this = 1;
211 }
212 goto out_unlock;
213 }
214 }
215 }
216
217 out_unlock:
218 mutex_unlock(&i2sdev->lock);
219 return result;
220}
221
222#undef CHECK_RATE
223
224static int i2sbus_pcm_close(struct i2sbus_dev *i2sdev, int in)
225{
226 struct codec_info_item *cii;
227 struct pcm_info *pi;
228 int err = 0, tmp;
229
230 mutex_lock(&i2sdev->lock);
231
232 get_pcm_info(i2sdev, in, &pi, NULL);
233
234 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
235 if (cii->codec->close) {
236 tmp = cii->codec->close(cii, pi->substream);
237 if (tmp)
238 err = tmp;
239 }
240 }
241
242 pi->substream = NULL;
243 pi->active = 0;
244 mutex_unlock(&i2sdev->lock);
245 return err;
246}
247
248static int i2sbus_hw_params(struct snd_pcm_substream *substream,
249 struct snd_pcm_hw_params *params)
250{
251 return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
252}
253
254static int i2sbus_hw_free(struct snd_pcm_substream *substream)
255{
256 snd_pcm_lib_free_pages(substream);
257 return 0;
258}
259
260static int i2sbus_pcm_prepare(struct i2sbus_dev *i2sdev, int in)
261{
262 /* whee. Hard work now. The user has selected a bitrate
263 * and bit format, so now we have to program our
264 * I2S controller appropriately. */
265 struct snd_pcm_runtime *runtime;
266 struct dbdma_cmd *command;
267 int i, periodsize;
268 dma_addr_t offset;
269 struct bus_info bi;
270 struct codec_info_item *cii;
271 int sfr = 0; /* serial format register */
272 int dws = 0; /* data word sizes reg */
273 int input_16bit;
274 struct pcm_info *pi, *other;
275 int cnt;
276 int result = 0;
277
278 mutex_lock(&i2sdev->lock);
279
280 get_pcm_info(i2sdev, in, &pi, &other);
281
282 if (pi->dbdma_ring.running) {
283 result = -EBUSY;
284 goto out_unlock;
285 }
286
287 runtime = pi->substream->runtime;
288 pi->active = 1;
289 if (other->active &&
290 ((i2sdev->format != runtime->format)
291 || (i2sdev->rate != runtime->rate))) {
292 result = -EINVAL;
293 goto out_unlock;
294 }
295
296 i2sdev->format = runtime->format;
297 i2sdev->rate = runtime->rate;
298
299 periodsize = snd_pcm_lib_period_bytes(pi->substream);
300 pi->current_period = 0;
301
302 /* generate dbdma command ring first */
303 command = pi->dbdma_ring.cmds;
304 offset = runtime->dma_addr;
305 for (i = 0; i < pi->substream->runtime->periods;
306 i++, command++, offset += periodsize) {
307 memset(command, 0, sizeof(struct dbdma_cmd));
308 command->command =
309 cpu_to_le16((in ? INPUT_MORE : OUTPUT_MORE) | INTR_ALWAYS);
310 command->phy_addr = cpu_to_le32(offset);
311 command->req_count = cpu_to_le16(periodsize);
312 command->xfer_status = cpu_to_le16(0);
313 }
314 /* last one branches back to first */
315 command--;
316 command->command |= cpu_to_le16(BR_ALWAYS);
317 command->cmd_dep = cpu_to_le32(pi->dbdma_ring.bus_cmd_start);
318
319 /* ok, let's set the serial format and stuff */
320 switch (runtime->format) {
321 /* 16 bit formats */
322 case SNDRV_PCM_FORMAT_S16_BE:
323 case SNDRV_PCM_FORMAT_U16_BE:
324 /* FIXME: if we add different bus factors we need to
325 * do more here!! */
326 bi.bus_factor = 0;
327 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
328 bi.bus_factor = cii->codec->bus_factor;
329 break;
330 }
331 if (!bi.bus_factor) {
332 result = -ENODEV;
333 goto out_unlock;
334 }
335 input_16bit = 1;
336 break;
337 case SNDRV_PCM_FORMAT_S32_BE:
338 case SNDRV_PCM_FORMAT_U32_BE:
339 /* force 64x bus speed, otherwise the data cannot be
340 * transferred quickly enough! */
341 bi.bus_factor = 64;
342 input_16bit = 0;
343 break;
344 default:
345 result = -EINVAL;
346 goto out_unlock;
347 }
348 /* we assume all sysclocks are the same! */
349 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
350 bi.sysclock_factor = cii->codec->sysclock_factor;
351 break;
352 }
353
354 if (clock_and_divisors(bi.sysclock_factor,
355 bi.bus_factor,
356 runtime->rate,
357 &sfr) < 0) {
358 result = -EINVAL;
359 goto out_unlock;
360 }
361 switch (bi.bus_factor) {
362 case 32:
363 sfr |= I2S_SF_SERIAL_FORMAT_I2S_32X;
364 break;
365 case 64:
366 sfr |= I2S_SF_SERIAL_FORMAT_I2S_64X;
367 break;
368 }
369 /* FIXME: THIS ASSUMES MASTER ALL THE TIME */
370 sfr |= I2S_SF_SCLK_MASTER;
371
372 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
373 int err = 0;
374 if (cii->codec->prepare)
375 err = cii->codec->prepare(cii, &bi, pi->substream);
376 if (err) {
377 result = err;
378 goto out_unlock;
379 }
380 }
381 /* codecs are fine with it, so set our clocks */
382 if (input_16bit)
383 dws = (2 << I2S_DWS_NUM_CHANNELS_IN_SHIFT) |
384 (2 << I2S_DWS_NUM_CHANNELS_OUT_SHIFT) |
385 I2S_DWS_DATA_IN_16BIT | I2S_DWS_DATA_OUT_16BIT;
386 else
387 dws = (2 << I2S_DWS_NUM_CHANNELS_IN_SHIFT) |
388 (2 << I2S_DWS_NUM_CHANNELS_OUT_SHIFT) |
389 I2S_DWS_DATA_IN_24BIT | I2S_DWS_DATA_OUT_24BIT;
390
391 /* early exit if already programmed correctly */
392 /* not locking these is fine since we touch them only in this function */
393 if (in_le32(&i2sdev->intfregs->serial_format) == sfr
394 && in_le32(&i2sdev->intfregs->data_word_sizes) == dws)
395 goto out_unlock;
396
397 /* let's notify the codecs about clocks going away.
398 * For now we only do mastering on the i2s cell... */
399 list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
400 if (cii->codec->switch_clock)
401 cii->codec->switch_clock(cii, CLOCK_SWITCH_PREPARE_SLAVE);
402
403 i2sbus_control_enable(i2sdev->control, i2sdev);
404 i2sbus_control_cell(i2sdev->control, i2sdev, 1);
405
406 out_le32(&i2sdev->intfregs->intr_ctl, I2S_PENDING_CLOCKS_STOPPED);
407
408 i2sbus_control_clock(i2sdev->control, i2sdev, 0);
409
410 msleep(1);
411
412 /* wait for clock stopped. This can apparently take a while... */
413 cnt = 100;
414 while (cnt-- &&
415 !(in_le32(&i2sdev->intfregs->intr_ctl) & I2S_PENDING_CLOCKS_STOPPED)) {
416 msleep(5);
417 }
418 out_le32(&i2sdev->intfregs->intr_ctl, I2S_PENDING_CLOCKS_STOPPED);
419
420 /* not locking these is fine since we touch them only in this function */
421 out_le32(&i2sdev->intfregs->serial_format, sfr);
422 out_le32(&i2sdev->intfregs->data_word_sizes, dws);
423
424 i2sbus_control_enable(i2sdev->control, i2sdev);
425 i2sbus_control_cell(i2sdev->control, i2sdev, 1);
426 i2sbus_control_clock(i2sdev->control, i2sdev, 1);
427 msleep(1);
428
429 list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
430 if (cii->codec->switch_clock)
431 cii->codec->switch_clock(cii, CLOCK_SWITCH_SLAVE);
432
433 out_unlock:
434 mutex_unlock(&i2sdev->lock);
435 return result;
436}
437
438static struct dbdma_cmd STOP_CMD = {
439 .command = __constant_cpu_to_le16(DBDMA_STOP),
440};
441
442static int i2sbus_pcm_trigger(struct i2sbus_dev *i2sdev, int in, int cmd)
443{
444 struct codec_info_item *cii;
445 struct pcm_info *pi;
446 int timeout;
447 struct dbdma_cmd tmp;
448 int result = 0;
449 unsigned long flags;
450
451 spin_lock_irqsave(&i2sdev->low_lock, flags);
452
453 get_pcm_info(i2sdev, in, &pi, NULL);
454
455 switch (cmd) {
456 case SNDRV_PCM_TRIGGER_START:
457 case SNDRV_PCM_TRIGGER_RESUME:
458 if (pi->dbdma_ring.running) {
459 result = -EALREADY;
460 goto out_unlock;
461 }
462 list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
463 if (cii->codec->start)
464 cii->codec->start(cii, pi->substream);
465 pi->dbdma_ring.running = 1;
466
467 /* reset dma engine */
468 out_le32(&pi->dbdma->control,
469 0 | (RUN | PAUSE | FLUSH | WAKE) << 16);
470 timeout = 100;
471 while (in_le32(&pi->dbdma->status) & RUN && timeout--)
472 udelay(1);
473 if (timeout <= 0) {
474 printk(KERN_ERR
475 "i2sbus: error waiting for dma reset\n");
476 result = -ENXIO;
477 goto out_unlock;
478 }
479
480 /* write dma command buffer address to the dbdma chip */
481 out_le32(&pi->dbdma->cmdptr, pi->dbdma_ring.bus_cmd_start);
482 /* post PCI write */
483 mb();
484 (void)in_le32(&pi->dbdma->status);
485
486 /* change first command to STOP */
487 tmp = *pi->dbdma_ring.cmds;
488 *pi->dbdma_ring.cmds = STOP_CMD;
489
490 /* set running state, remember that the first command is STOP */
491 out_le32(&pi->dbdma->control, RUN | (RUN << 16));
492 timeout = 100;
493 /* wait for STOP to be executed */
494 while (in_le32(&pi->dbdma->status) & ACTIVE && timeout--)
495 udelay(1);
496 if (timeout <= 0) {
497 printk(KERN_ERR "i2sbus: error waiting for dma stop\n");
498 result = -ENXIO;
499 goto out_unlock;
500 }
501 /* again, write dma command buffer address to the dbdma chip,
502 * this time of the first real command */
503 *pi->dbdma_ring.cmds = tmp;
504 out_le32(&pi->dbdma->cmdptr, pi->dbdma_ring.bus_cmd_start);
505 /* post write */
506 mb();
507 (void)in_le32(&pi->dbdma->status);
508
509 /* reset dma engine again */
510 out_le32(&pi->dbdma->control,
511 0 | (RUN | PAUSE | FLUSH | WAKE) << 16);
512 timeout = 100;
513 while (in_le32(&pi->dbdma->status) & RUN && timeout--)
514 udelay(1);
515 if (timeout <= 0) {
516 printk(KERN_ERR
517 "i2sbus: error waiting for dma reset\n");
518 result = -ENXIO;
519 goto out_unlock;
520 }
521
522 /* wake up the chip with the next descriptor */
523 out_le32(&pi->dbdma->control,
524 (RUN | WAKE) | ((RUN | WAKE) << 16));
525 /* get the frame count */
526 pi->frame_count = in_le32(&i2sdev->intfregs->frame_count);
527
528 /* off you go! */
529 break;
530 case SNDRV_PCM_TRIGGER_STOP:
531 case SNDRV_PCM_TRIGGER_SUSPEND:
532 if (!pi->dbdma_ring.running) {
533 result = -EALREADY;
534 goto out_unlock;
535 }
536
537 /* turn off all relevant bits */
538 out_le32(&pi->dbdma->control,
539 (RUN | WAKE | FLUSH | PAUSE) << 16);
540 {
541 /* FIXME: move to own function */
542 int timeout = 5000;
543 while ((in_le32(&pi->dbdma->status) & RUN)
544 && --timeout > 0)
545 udelay(1);
546 if (!timeout)
547 printk(KERN_ERR
548 "i2sbus: timed out turning "
549 "off dbdma engine!\n");
550 }
551
552 pi->dbdma_ring.running = 0;
553 list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
554 if (cii->codec->stop)
555 cii->codec->stop(cii, pi->substream);
556 break;
557 default:
558 result = -EINVAL;
559 goto out_unlock;
560 }
561
562 out_unlock:
563 spin_unlock_irqrestore(&i2sdev->low_lock, flags);
564 return result;
565}
566
567static snd_pcm_uframes_t i2sbus_pcm_pointer(struct i2sbus_dev *i2sdev, int in)
568{
569 struct pcm_info *pi;
570 u32 fc;
571
572 get_pcm_info(i2sdev, in, &pi, NULL);
573
574 fc = in_le32(&i2sdev->intfregs->frame_count);
575 fc = fc - pi->frame_count;
576
577 return (bytes_to_frames(pi->substream->runtime,
578 pi->current_period *
579 snd_pcm_lib_period_bytes(pi->substream))
580 + fc) % pi->substream->runtime->buffer_size;
581}
582
583static inline void handle_interrupt(struct i2sbus_dev *i2sdev, int in)
584{
585 struct pcm_info *pi;
586 u32 fc;
587 u32 delta;
588
589 spin_lock(&i2sdev->low_lock);
590 get_pcm_info(i2sdev, in, &pi, NULL);
591
592 if (!pi->dbdma_ring.running) {
593 /* there was still an interrupt pending
594 * while we stopped. or maybe another
595 * processor (not the one that was stopping
596 * the DMA engine) was spinning above
597 * waiting for the lock. */
598 goto out_unlock;
599 }
600
601 fc = in_le32(&i2sdev->intfregs->frame_count);
602 /* a counter overflow does not change the calculation. */
603 delta = fc - pi->frame_count;
604
605 /* update current_period */
606 while (delta >= pi->substream->runtime->period_size) {
607 pi->current_period++;
608 delta = delta - pi->substream->runtime->period_size;
609 }
610
611 if (unlikely(delta)) {
612 /* Some interrupt came late, so check the dbdma.
613 * This special case exists to syncronize the frame_count with
614 * the dbdma transfer, but is hit every once in a while. */
615 int period;
616
617 period = (in_le32(&pi->dbdma->cmdptr)
618 - pi->dbdma_ring.bus_cmd_start)
619 / sizeof(struct dbdma_cmd);
620 pi->current_period = pi->current_period
621 % pi->substream->runtime->periods;
622
623 while (pi->current_period != period) {
624 pi->current_period++;
625 pi->current_period %= pi->substream->runtime->periods;
626 /* Set delta to zero, as the frame_count value is too
627 * high (otherwise the code path will not be executed).
628 * This corrects the fact that the frame_count is too
629 * low at the beginning due to buffering. */
630 delta = 0;
631 }
632 }
633
634 pi->frame_count = fc - delta;
635 pi->current_period %= pi->substream->runtime->periods;
636
637 spin_unlock(&i2sdev->low_lock);
638 /* may call _trigger again, hence needs to be unlocked */
639 snd_pcm_period_elapsed(pi->substream);
640 return;
641 out_unlock:
642 spin_unlock(&i2sdev->low_lock);
643}
644
645irqreturn_t i2sbus_tx_intr(int irq, void *devid, struct pt_regs *regs)
646{
647 handle_interrupt((struct i2sbus_dev *)devid, 0);
648 return IRQ_HANDLED;
649}
650
651irqreturn_t i2sbus_rx_intr(int irq, void *devid, struct pt_regs * regs)
652{
653 handle_interrupt((struct i2sbus_dev *)devid, 1);
654 return IRQ_HANDLED;
655}
656
657static int i2sbus_playback_open(struct snd_pcm_substream *substream)
658{
659 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
660
661 if (!i2sdev)
662 return -EINVAL;
663 i2sdev->out.substream = substream;
664 return i2sbus_pcm_open(i2sdev, 0);
665}
666
667static int i2sbus_playback_close(struct snd_pcm_substream *substream)
668{
669 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
670 int err;
671
672 if (!i2sdev)
673 return -EINVAL;
674 if (i2sdev->out.substream != substream)
675 return -EINVAL;
676 err = i2sbus_pcm_close(i2sdev, 0);
677 if (!err)
678 i2sdev->out.substream = NULL;
679 return err;
680}
681
682static int i2sbus_playback_prepare(struct snd_pcm_substream *substream)
683{
684 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
685
686 if (!i2sdev)
687 return -EINVAL;
688 if (i2sdev->out.substream != substream)
689 return -EINVAL;
690 return i2sbus_pcm_prepare(i2sdev, 0);
691}
692
693static int i2sbus_playback_trigger(struct snd_pcm_substream *substream, int cmd)
694{
695 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
696
697 if (!i2sdev)
698 return -EINVAL;
699 if (i2sdev->out.substream != substream)
700 return -EINVAL;
701 return i2sbus_pcm_trigger(i2sdev, 0, cmd);
702}
703
704static snd_pcm_uframes_t i2sbus_playback_pointer(struct snd_pcm_substream
705 *substream)
706{
707 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
708
709 if (!i2sdev)
710 return -EINVAL;
711 if (i2sdev->out.substream != substream)
712 return 0;
713 return i2sbus_pcm_pointer(i2sdev, 0);
714}
715
716static struct snd_pcm_ops i2sbus_playback_ops = {
717 .open = i2sbus_playback_open,
718 .close = i2sbus_playback_close,
719 .ioctl = snd_pcm_lib_ioctl,
720 .hw_params = i2sbus_hw_params,
721 .hw_free = i2sbus_hw_free,
722 .prepare = i2sbus_playback_prepare,
723 .trigger = i2sbus_playback_trigger,
724 .pointer = i2sbus_playback_pointer,
725};
726
727static int i2sbus_record_open(struct snd_pcm_substream *substream)
728{
729 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
730
731 if (!i2sdev)
732 return -EINVAL;
733 i2sdev->in.substream = substream;
734 return i2sbus_pcm_open(i2sdev, 1);
735}
736
737static int i2sbus_record_close(struct snd_pcm_substream *substream)
738{
739 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
740 int err;
741
742 if (!i2sdev)
743 return -EINVAL;
744 if (i2sdev->in.substream != substream)
745 return -EINVAL;
746 err = i2sbus_pcm_close(i2sdev, 1);
747 if (!err)
748 i2sdev->in.substream = NULL;
749 return err;
750}
751
752static int i2sbus_record_prepare(struct snd_pcm_substream *substream)
753{
754 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
755
756 if (!i2sdev)
757 return -EINVAL;
758 if (i2sdev->in.substream != substream)
759 return -EINVAL;
760 return i2sbus_pcm_prepare(i2sdev, 1);
761}
762
763static int i2sbus_record_trigger(struct snd_pcm_substream *substream, int cmd)
764{
765 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
766
767 if (!i2sdev)
768 return -EINVAL;
769 if (i2sdev->in.substream != substream)
770 return -EINVAL;
771 return i2sbus_pcm_trigger(i2sdev, 1, cmd);
772}
773
774static snd_pcm_uframes_t i2sbus_record_pointer(struct snd_pcm_substream
775 *substream)
776{
777 struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
778
779 if (!i2sdev)
780 return -EINVAL;
781 if (i2sdev->in.substream != substream)
782 return 0;
783 return i2sbus_pcm_pointer(i2sdev, 1);
784}
785
786static struct snd_pcm_ops i2sbus_record_ops = {
787 .open = i2sbus_record_open,
788 .close = i2sbus_record_close,
789 .ioctl = snd_pcm_lib_ioctl,
790 .hw_params = i2sbus_hw_params,
791 .hw_free = i2sbus_hw_free,
792 .prepare = i2sbus_record_prepare,
793 .trigger = i2sbus_record_trigger,
794 .pointer = i2sbus_record_pointer,
795};
796
797static void i2sbus_private_free(struct snd_pcm *pcm)
798{
799 struct i2sbus_dev *i2sdev = snd_pcm_chip(pcm);
800 struct codec_info_item *p, *tmp;
801
802 i2sdev->sound.pcm = NULL;
803 i2sdev->out.created = 0;
804 i2sdev->in.created = 0;
805 list_for_each_entry_safe(p, tmp, &i2sdev->sound.codec_list, list) {
806 printk(KERN_ERR "i2sbus: a codec didn't unregister!\n");
807 list_del(&p->list);
808 module_put(p->codec->owner);
809 kfree(p);
810 }
811 soundbus_dev_put(&i2sdev->sound);
812 module_put(THIS_MODULE);
813}
814
815/* FIXME: this function needs an error handling strategy with labels */
816int
817i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
818 struct codec_info *ci, void *data)
819{
820 int err, in = 0, out = 0;
821 struct transfer_info *tmp;
822 struct i2sbus_dev *i2sdev = soundbus_dev_to_i2sbus_dev(dev);
823 struct codec_info_item *cii;
824
825 if (!dev->pcmname || dev->pcmid == -1) {
826 printk(KERN_ERR "i2sbus: pcm name and id must be set!\n");
827 return -EINVAL;
828 }
829
830 list_for_each_entry(cii, &dev->codec_list, list) {
831 if (cii->codec_data == data)
832 return -EALREADY;
833 }
834
835 if (!ci->transfers || !ci->transfers->formats
836 || !ci->transfers->rates || !ci->usable)
837 return -EINVAL;
838
839 /* we currently code the i2s transfer on the clock, and support only
840 * 32 and 64 */
841 if (ci->bus_factor != 32 && ci->bus_factor != 64)
842 return -EINVAL;
843
844 /* If you want to fix this, you need to keep track of what transport infos
845 * are to be used, which codecs they belong to, and then fix all the
846 * sysclock/busclock stuff above to depend on which is usable */
847 list_for_each_entry(cii, &dev->codec_list, list) {
848 if (cii->codec->sysclock_factor != ci->sysclock_factor) {
849 printk(KERN_DEBUG
850 "cannot yet handle multiple different sysclocks!\n");
851 return -EINVAL;
852 }
853 if (cii->codec->bus_factor != ci->bus_factor) {
854 printk(KERN_DEBUG
855 "cannot yet handle multiple different bus clocks!\n");
856 return -EINVAL;
857 }
858 }
859
860 tmp = ci->transfers;
861 while (tmp->formats && tmp->rates) {
862 if (tmp->transfer_in)
863 in = 1;
864 else
865 out = 1;
866 tmp++;
867 }
868
869 cii = kzalloc(sizeof(struct codec_info_item), GFP_KERNEL);
870 if (!cii) {
871 printk(KERN_DEBUG "i2sbus: failed to allocate cii\n");
872 return -ENOMEM;
873 }
874
875 /* use the private data to point to the codec info */
876 cii->sdev = soundbus_dev_get(dev);
877 cii->codec = ci;
878 cii->codec_data = data;
879
880 if (!cii->sdev) {
881 printk(KERN_DEBUG
882 "i2sbus: failed to get soundbus dev reference\n");
883 kfree(cii);
884 return -ENODEV;
885 }
886
887 if (!try_module_get(THIS_MODULE)) {
888 printk(KERN_DEBUG "i2sbus: failed to get module reference!\n");
889 soundbus_dev_put(dev);
890 kfree(cii);
891 return -EBUSY;
892 }
893
894 if (!try_module_get(ci->owner)) {
895 printk(KERN_DEBUG
896 "i2sbus: failed to get module reference to codec owner!\n");
897 module_put(THIS_MODULE);
898 soundbus_dev_put(dev);
899 kfree(cii);
900 return -EBUSY;
901 }
902
903 if (!dev->pcm) {
904 err = snd_pcm_new(card,
905 dev->pcmname,
906 dev->pcmid,
907 0,
908 0,
909 &dev->pcm);
910 if (err) {
911 printk(KERN_DEBUG "i2sbus: failed to create pcm\n");
912 kfree(cii);
913 module_put(ci->owner);
914 soundbus_dev_put(dev);
915 module_put(THIS_MODULE);
916 return err;
917 }
918 }
919
920 /* ALSA yet again sucks.
921 * If it is ever fixed, remove this line. See below. */
922 out = in = 1;
923
924 if (!i2sdev->out.created && out) {
925 if (dev->pcm->card != card) {
926 /* eh? */
927 printk(KERN_ERR
928 "Can't attach same bus to different cards!\n");
929 module_put(ci->owner);
930 kfree(cii);
931 soundbus_dev_put(dev);
932 module_put(THIS_MODULE);
933 return -EINVAL;
934 }
935 if ((err =
936 snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK, 1))) {
937 module_put(ci->owner);
938 kfree(cii);
939 soundbus_dev_put(dev);
940 module_put(THIS_MODULE);
941 return err;
942 }
943 snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK,
944 &i2sbus_playback_ops);
945 i2sdev->out.created = 1;
946 }
947
948 if (!i2sdev->in.created && in) {
949 if (dev->pcm->card != card) {
950 printk(KERN_ERR
951 "Can't attach same bus to different cards!\n");
952 module_put(ci->owner);
953 kfree(cii);
954 soundbus_dev_put(dev);
955 module_put(THIS_MODULE);
956 return -EINVAL;
957 }
958 if ((err =
959 snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_CAPTURE, 1))) {
960 module_put(ci->owner);
961 kfree(cii);
962 soundbus_dev_put(dev);
963 module_put(THIS_MODULE);
964 return err;
965 }
966 snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_CAPTURE,
967 &i2sbus_record_ops);
968 i2sdev->in.created = 1;
969 }
970
971 /* so we have to register the pcm after adding any substream
972 * to it because alsa doesn't create the devices for the
973 * substreams when we add them later.
974 * Therefore, force in and out on both busses (above) and
975 * register the pcm now instead of just after creating it.
976 */
977 err = snd_device_register(card, dev->pcm);
978 if (err) {
979 printk(KERN_ERR "i2sbus: error registering new pcm\n");
980 module_put(ci->owner);
981 kfree(cii);
982 soundbus_dev_put(dev);
983 module_put(THIS_MODULE);
984 return err;
985 }
986 /* no errors any more, so let's add this to our list */
987 list_add(&cii->list, &dev->codec_list);
988
989 dev->pcm->private_data = i2sdev;
990 dev->pcm->private_free = i2sbus_private_free;
991
992 /* well, we really should support scatter/gather DMA */
993 snd_pcm_lib_preallocate_pages_for_all(
994 dev->pcm, SNDRV_DMA_TYPE_DEV,
995 snd_dma_pci_data(macio_get_pci_dev(i2sdev->macio)),
996 64 * 1024, 64 * 1024);
997
998 return 0;
999}
1000
1001void i2sbus_detach_codec(struct soundbus_dev *dev, void *data)
1002{
1003 struct codec_info_item *cii = NULL, *i;
1004
1005 list_for_each_entry(i, &dev->codec_list, list) {
1006 if (i->codec_data == data) {
1007 cii = i;
1008 break;
1009 }
1010 }
1011 if (cii) {
1012 list_del(&cii->list);
1013 module_put(cii->codec->owner);
1014 kfree(cii);
1015 }
1016 /* no more codecs, but still a pcm? */
1017 if (list_empty(&dev->codec_list) && dev->pcm) {
1018 /* the actual cleanup is done by the callback above! */
1019 snd_device_free(dev->pcm->card, dev->pcm);
1020 }
1021}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-22 03:43:09 -0500