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x86: Fix S4 regression
[linux-btrfs-devel.git] / sound / arm / aaci.c
blobd0cead38d5fb785acc2812f107d88802db0f47a4
1 /*
2 * linux/sound/arm/aaci.c - ARM PrimeCell AACI PL041 driver
3 *
4 * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Documentation: ARM DDI 0173B
11 */
12 #include <linux/module.h>
13 #include <linux/delay.h>
14 #include <linux/init.h>
15 #include <linux/ioport.h>
16 #include <linux/device.h>
17 #include <linux/spinlock.h>
18 #include <linux/interrupt.h>
19 #include <linux/err.h>
20 #include <linux/amba/bus.h>
21 #include <linux/io.h>
22
23 #include <sound/core.h>
24 #include <sound/initval.h>
25 #include <sound/ac97_codec.h>
26 #include <sound/pcm.h>
27 #include <sound/pcm_params.h>
28
29 #include "aaci.h"
30
31 #define DRIVER_NAME "aaci-pl041"
32
33 #define FRAME_PERIOD_US 21
34
35 /*
36 * PM support is not complete. Turn it off.
37 */
38 #undef CONFIG_PM
39
40 static void aaci_ac97_select_codec(struct aaci *aaci, struct snd_ac97 *ac97)
41 {
42 u32 v, maincr = aaci->maincr | MAINCR_SCRA(ac97->num);
43
44 /*
45 * Ensure that the slot 1/2 RX registers are empty.
46 */
47 v = readl(aaci->base + AACI_SLFR);
48 if (v & SLFR_2RXV)
49 readl(aaci->base + AACI_SL2RX);
50 if (v & SLFR_1RXV)
51 readl(aaci->base + AACI_SL1RX);
52
53 if (maincr != readl(aaci->base + AACI_MAINCR)) {
54 writel(maincr, aaci->base + AACI_MAINCR);
55 readl(aaci->base + AACI_MAINCR);
56 udelay(1);
57 }
58 }
59
60 /*
61 * P29:
62 * The recommended use of programming the external codec through slot 1
63 * and slot 2 data is to use the channels during setup routines and the
64 * slot register at any other time. The data written into slot 1, slot 2
65 * and slot 12 registers is transmitted only when their corresponding
66 * SI1TxEn, SI2TxEn and SI12TxEn bits are set in the AACI_MAINCR
67 * register.
68 */
69 static void aaci_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
70 unsigned short val)
71 {
72 struct aaci *aaci = ac97->private_data;
73 int timeout;
74 u32 v;
75
76 if (ac97->num >= 4)
77 return;
78
79 mutex_lock(&aaci->ac97_sem);
80
81 aaci_ac97_select_codec(aaci, ac97);
82
83 /*
84 * P54: You must ensure that AACI_SL2TX is always written
85 * to, if required, before data is written to AACI_SL1TX.
86 */
87 writel(val << 4, aaci->base + AACI_SL2TX);
88 writel(reg << 12, aaci->base + AACI_SL1TX);
89
90 /* Initially, wait one frame period */
91 udelay(FRAME_PERIOD_US);
92
93 /* And then wait an additional eight frame periods for it to be sent */
94 timeout = FRAME_PERIOD_US * 8;
95 do {
96 udelay(1);
97 v = readl(aaci->base + AACI_SLFR);
98 } while ((v & (SLFR_1TXB|SLFR_2TXB)) && --timeout);
99
100 if (v & (SLFR_1TXB|SLFR_2TXB))
101 dev_err(&aaci->dev->dev,
102 "timeout waiting for write to complete\n");
103
104 mutex_unlock(&aaci->ac97_sem);
105 }
106
107 /*
108 * Read an AC'97 register.
109 */
110 static unsigned short aaci_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
111 {
112 struct aaci *aaci = ac97->private_data;
113 int timeout, retries = 10;
114 u32 v;
115
116 if (ac97->num >= 4)
117 return ~0;
118
119 mutex_lock(&aaci->ac97_sem);
120
121 aaci_ac97_select_codec(aaci, ac97);
122
123 /*
124 * Write the register address to slot 1.
125 */
126 writel((reg << 12) | (1 << 19), aaci->base + AACI_SL1TX);
127
128 /* Initially, wait one frame period */
129 udelay(FRAME_PERIOD_US);
130
131 /* And then wait an additional eight frame periods for it to be sent */
132 timeout = FRAME_PERIOD_US * 8;
133 do {
134 udelay(1);
135 v = readl(aaci->base + AACI_SLFR);
136 } while ((v & SLFR_1TXB) && --timeout);
137
138 if (v & SLFR_1TXB) {
139 dev_err(&aaci->dev->dev, "timeout on slot 1 TX busy\n");
140 v = ~0;
141 goto out;
142 }
143
144 /* Now wait for the response frame */
145 udelay(FRAME_PERIOD_US);
146
147 /* And then wait an additional eight frame periods for data */
148 timeout = FRAME_PERIOD_US * 8;
149 do {
150 udelay(1);
151 cond_resched();
152 v = readl(aaci->base + AACI_SLFR) & (SLFR_1RXV|SLFR_2RXV);
153 } while ((v != (SLFR_1RXV|SLFR_2RXV)) && --timeout);
154
155 if (v != (SLFR_1RXV|SLFR_2RXV)) {
156 dev_err(&aaci->dev->dev, "timeout on RX valid\n");
157 v = ~0;
158 goto out;
159 }
160
161 do {
162 v = readl(aaci->base + AACI_SL1RX) >> 12;
163 if (v == reg) {
164 v = readl(aaci->base + AACI_SL2RX) >> 4;
165 break;
166 } else if (--retries) {
167 dev_warn(&aaci->dev->dev,
168 "ac97 read back fail. retry\n");
169 continue;
170 } else {
171 dev_warn(&aaci->dev->dev,
172 "wrong ac97 register read back (%x != %x)\n",
173 v, reg);
174 v = ~0;
175 }
176 } while (retries);
177 out:
178 mutex_unlock(&aaci->ac97_sem);
179 return v;
180 }
181
182 static inline void
183 aaci_chan_wait_ready(struct aaci_runtime *aacirun, unsigned long mask)
184 {
185 u32 val;
186 int timeout = 5000;
187
188 do {
189 udelay(1);
190 val = readl(aacirun->base + AACI_SR);
191 } while (val & mask && timeout--);
192 }
193
194
195
196 /*
197 * Interrupt support.
198 */
199 static void aaci_fifo_irq(struct aaci *aaci, int channel, u32 mask)
200 {
201 if (mask & ISR_ORINTR) {
202 dev_warn(&aaci->dev->dev, "RX overrun on chan %d\n", channel);
203 writel(ICLR_RXOEC1 << channel, aaci->base + AACI_INTCLR);
204 }
205
206 if (mask & ISR_RXTOINTR) {
207 dev_warn(&aaci->dev->dev, "RX timeout on chan %d\n", channel);
208 writel(ICLR_RXTOFEC1 << channel, aaci->base + AACI_INTCLR);
209 }
210
211 if (mask & ISR_RXINTR) {
212 struct aaci_runtime *aacirun = &aaci->capture;
213 bool period_elapsed = false;
214 void *ptr;
215
216 if (!aacirun->substream || !aacirun->start) {
217 dev_warn(&aaci->dev->dev, "RX interrupt???\n");
218 writel(0, aacirun->base + AACI_IE);
219 return;
220 }
221
222 spin_lock(&aacirun->lock);
223
224 ptr = aacirun->ptr;
225 do {
226 unsigned int len = aacirun->fifo_bytes;
227 u32 val;
228
229 if (aacirun->bytes <= 0) {
230 aacirun->bytes += aacirun->period;
231 period_elapsed = true;
232 }
233 if (!(aacirun->cr & CR_EN))
234 break;
235
236 val = readl(aacirun->base + AACI_SR);
237 if (!(val & SR_RXHF))
238 break;
239 if (!(val & SR_RXFF))
240 len >>= 1;
241
242 aacirun->bytes -= len;
243
244 /* reading 16 bytes at a time */
245 for( ; len > 0; len -= 16) {
246 asm(
247 "ldmia %1, {r0, r1, r2, r3}\n\t"
248 "stmia %0!, {r0, r1, r2, r3}"
249 : "+r" (ptr)
250 : "r" (aacirun->fifo)
251 : "r0", "r1", "r2", "r3", "cc");
252
253 if (ptr >= aacirun->end)
254 ptr = aacirun->start;
255 }
256 } while(1);
257
258 aacirun->ptr = ptr;
259
260 spin_unlock(&aacirun->lock);
261
262 if (period_elapsed)
263 snd_pcm_period_elapsed(aacirun->substream);
264 }
265
266 if (mask & ISR_URINTR) {
267 dev_dbg(&aaci->dev->dev, "TX underrun on chan %d\n", channel);
268 writel(ICLR_TXUEC1 << channel, aaci->base + AACI_INTCLR);
269 }
270
271 if (mask & ISR_TXINTR) {
272 struct aaci_runtime *aacirun = &aaci->playback;
273 bool period_elapsed = false;
274 void *ptr;
275
276 if (!aacirun->substream || !aacirun->start) {
277 dev_warn(&aaci->dev->dev, "TX interrupt???\n");
278 writel(0, aacirun->base + AACI_IE);
279 return;
280 }
281
282 spin_lock(&aacirun->lock);
283
284 ptr = aacirun->ptr;
285 do {
286 unsigned int len = aacirun->fifo_bytes;
287 u32 val;
288
289 if (aacirun->bytes <= 0) {
290 aacirun->bytes += aacirun->period;
291 period_elapsed = true;
292 }
293 if (!(aacirun->cr & CR_EN))
294 break;
295
296 val = readl(aacirun->base + AACI_SR);
297 if (!(val & SR_TXHE))
298 break;
299 if (!(val & SR_TXFE))
300 len >>= 1;
301
302 aacirun->bytes -= len;
303
304 /* writing 16 bytes at a time */
305 for ( ; len > 0; len -= 16) {
306 asm(
307 "ldmia %0!, {r0, r1, r2, r3}\n\t"
308 "stmia %1, {r0, r1, r2, r3}"
309 : "+r" (ptr)
310 : "r" (aacirun->fifo)
311 : "r0", "r1", "r2", "r3", "cc");
312
313 if (ptr >= aacirun->end)
314 ptr = aacirun->start;
315 }
316 } while (1);
317
318 aacirun->ptr = ptr;
319
320 spin_unlock(&aacirun->lock);
321
322 if (period_elapsed)
323 snd_pcm_period_elapsed(aacirun->substream);
324 }
325 }
326
327 static irqreturn_t aaci_irq(int irq, void *devid)
328 {
329 struct aaci *aaci = devid;
330 u32 mask;
331 int i;
332
333 mask = readl(aaci->base + AACI_ALLINTS);
334 if (mask) {
335 u32 m = mask;
336 for (i = 0; i < 4; i++, m >>= 7) {
337 if (m & 0x7f) {
338 aaci_fifo_irq(aaci, i, m);
339 }
340 }
341 }
342
343 return mask ? IRQ_HANDLED : IRQ_NONE;
344 }
345
346
347
348 /*
349 * ALSA support.
350 */
351 static struct snd_pcm_hardware aaci_hw_info = {
352 .info = SNDRV_PCM_INFO_MMAP |
353 SNDRV_PCM_INFO_MMAP_VALID |
354 SNDRV_PCM_INFO_INTERLEAVED |
355 SNDRV_PCM_INFO_BLOCK_TRANSFER |
356 SNDRV_PCM_INFO_RESUME,
357
358 /*
359 * ALSA doesn't support 18-bit or 20-bit packed into 32-bit
360 * words. It also doesn't support 12-bit at all.
361 */
362 .formats = SNDRV_PCM_FMTBIT_S16_LE,
363
364 /* rates are setup from the AC'97 codec */
365 .channels_min = 2,
366 .channels_max = 2,
367 .buffer_bytes_max = 64 * 1024,
368 .period_bytes_min = 256,
369 .period_bytes_max = PAGE_SIZE,
370 .periods_min = 4,
371 .periods_max = PAGE_SIZE / 16,
372 };
373
374 /*
375 * We can support two and four channel audio. Unfortunately
376 * six channel audio requires a non-standard channel ordering:
377 * 2 -> FL(3), FR(4)
378 * 4 -> FL(3), FR(4), SL(7), SR(8)
379 * 6 -> FL(3), FR(4), SL(7), SR(8), C(6), LFE(9) (required)
380 * FL(3), FR(4), C(6), SL(7), SR(8), LFE(9) (actual)
381 * This requires an ALSA configuration file to correct.
382 */
383 static int aaci_rule_channels(struct snd_pcm_hw_params *p,
384 struct snd_pcm_hw_rule *rule)
385 {
386 static unsigned int channel_list[] = { 2, 4, 6 };
387 struct aaci *aaci = rule->private;
388 unsigned int mask = 1 << 0, slots;
389
390 /* pcms[0] is the our 5.1 PCM instance. */
391 slots = aaci->ac97_bus->pcms[0].r[0].slots;
392 if (slots & (1 << AC97_SLOT_PCM_SLEFT)) {
393 mask |= 1 << 1;
394 if (slots & (1 << AC97_SLOT_LFE))
395 mask |= 1 << 2;
396 }
397
398 return snd_interval_list(hw_param_interval(p, rule->var),
399 ARRAY_SIZE(channel_list), channel_list, mask);
400 }
401
402 static int aaci_pcm_open(struct snd_pcm_substream *substream)
403 {
404 struct snd_pcm_runtime *runtime = substream->runtime;
405 struct aaci *aaci = substream->private_data;
406 struct aaci_runtime *aacirun;
407 int ret = 0;
408
409 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
410 aacirun = &aaci->playback;
411 } else {
412 aacirun = &aaci->capture;
413 }
414
415 aacirun->substream = substream;
416 runtime->private_data = aacirun;
417 runtime->hw = aaci_hw_info;
418 runtime->hw.rates = aacirun->pcm->rates;
419 snd_pcm_limit_hw_rates(runtime);
420
421 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
422 runtime->hw.channels_max = 6;
423
424 /* Add rule describing channel dependency. */
425 ret = snd_pcm_hw_rule_add(substream->runtime, 0,
426 SNDRV_PCM_HW_PARAM_CHANNELS,
427 aaci_rule_channels, aaci,
428 SNDRV_PCM_HW_PARAM_CHANNELS, -1);
429 if (ret)
430 return ret;
431
432 if (aacirun->pcm->r[1].slots)
433 snd_ac97_pcm_double_rate_rules(runtime);
434 }
435
436 /*
437 * ALSA wants the byte-size of the FIFOs. As we only support
438 * 16-bit samples, this is twice the FIFO depth irrespective
439 * of whether it's in compact mode or not.
440 */
441 runtime->hw.fifo_size = aaci->fifo_depth * 2;
442
443 mutex_lock(&aaci->irq_lock);
444 if (!aaci->users++) {
445 ret = request_irq(aaci->dev->irq[0], aaci_irq,
446 IRQF_SHARED | IRQF_DISABLED, DRIVER_NAME, aaci);
447 if (ret != 0)
448 aaci->users--;
449 }
450 mutex_unlock(&aaci->irq_lock);
451
452 return ret;
453 }
454
455
456 /*
457 * Common ALSA stuff
458 */
459 static int aaci_pcm_close(struct snd_pcm_substream *substream)
460 {
461 struct aaci *aaci = substream->private_data;
462 struct aaci_runtime *aacirun = substream->runtime->private_data;
463
464 WARN_ON(aacirun->cr & CR_EN);
465
466 aacirun->substream = NULL;
467
468 mutex_lock(&aaci->irq_lock);
469 if (!--aaci->users)
470 free_irq(aaci->dev->irq[0], aaci);
471 mutex_unlock(&aaci->irq_lock);
472
473 return 0;
474 }
475
476 static int aaci_pcm_hw_free(struct snd_pcm_substream *substream)
477 {
478 struct aaci_runtime *aacirun = substream->runtime->private_data;
479
480 /*
481 * This must not be called with the device enabled.
482 */
483 WARN_ON(aacirun->cr & CR_EN);
484
485 if (aacirun->pcm_open)
486 snd_ac97_pcm_close(aacirun->pcm);
487 aacirun->pcm_open = 0;
488
489 /*
490 * Clear out the DMA and any allocated buffers.
491 */
492 snd_pcm_lib_free_pages(substream);
493
494 return 0;
495 }
496
497 /* Channel to slot mask */
498 static const u32 channels_to_slotmask[] = {
499 [2] = CR_SL3 | CR_SL4,
500 [4] = CR_SL3 | CR_SL4 | CR_SL7 | CR_SL8,
501 [6] = CR_SL3 | CR_SL4 | CR_SL7 | CR_SL8 | CR_SL6 | CR_SL9,
502 };
503
504 static int aaci_pcm_hw_params(struct snd_pcm_substream *substream,
505 struct snd_pcm_hw_params *params)
506 {
507 struct aaci_runtime *aacirun = substream->runtime->private_data;
508 unsigned int channels = params_channels(params);
509 unsigned int rate = params_rate(params);
510 int dbl = rate > 48000;
511 int err;
512
513 aaci_pcm_hw_free(substream);
514 if (aacirun->pcm_open) {
515 snd_ac97_pcm_close(aacirun->pcm);
516 aacirun->pcm_open = 0;
517 }
518
519 /* channels is already limited to 2, 4, or 6 by aaci_rule_channels */
520 if (dbl && channels != 2)
521 return -EINVAL;
522
523 err = snd_pcm_lib_malloc_pages(substream,
524 params_buffer_bytes(params));
525 if (err >= 0) {
526 struct aaci *aaci = substream->private_data;
527
528 err = snd_ac97_pcm_open(aacirun->pcm, rate, channels,
529 aacirun->pcm->r[dbl].slots);
530
531 aacirun->pcm_open = err == 0;
532 aacirun->cr = CR_FEN | CR_COMPACT | CR_SZ16;
533 aacirun->cr |= channels_to_slotmask[channels + dbl * 2];
534
535 /*
536 * fifo_bytes is the number of bytes we transfer to/from
537 * the FIFO, including padding. So that's x4. As we're
538 * in compact mode, the FIFO is half the size.
539 */
540 aacirun->fifo_bytes = aaci->fifo_depth * 4 / 2;
541 }
542
543 return err;
544 }
545
546 static int aaci_pcm_prepare(struct snd_pcm_substream *substream)
547 {
548 struct snd_pcm_runtime *runtime = substream->runtime;
549 struct aaci_runtime *aacirun = runtime->private_data;
550
551 aacirun->period = snd_pcm_lib_period_bytes(substream);
552 aacirun->start = runtime->dma_area;
553 aacirun->end = aacirun->start + snd_pcm_lib_buffer_bytes(substream);
554 aacirun->ptr = aacirun->start;
555 aacirun->bytes = aacirun->period;
556
557 return 0;
558 }
559
560 static snd_pcm_uframes_t aaci_pcm_pointer(struct snd_pcm_substream *substream)
561 {
562 struct snd_pcm_runtime *runtime = substream->runtime;
563 struct aaci_runtime *aacirun = runtime->private_data;
564 ssize_t bytes = aacirun->ptr - aacirun->start;
565
566 return bytes_to_frames(runtime, bytes);
567 }
568
569
570 /*
571 * Playback specific ALSA stuff
572 */
573 static void aaci_pcm_playback_stop(struct aaci_runtime *aacirun)
574 {
575 u32 ie;
576
577 ie = readl(aacirun->base + AACI_IE);
578 ie &= ~(IE_URIE|IE_TXIE);
579 writel(ie, aacirun->base + AACI_IE);
580 aacirun->cr &= ~CR_EN;
581 aaci_chan_wait_ready(aacirun, SR_TXB);
582 writel(aacirun->cr, aacirun->base + AACI_TXCR);
583 }
584
585 static void aaci_pcm_playback_start(struct aaci_runtime *aacirun)
586 {
587 u32 ie;
588
589 aaci_chan_wait_ready(aacirun, SR_TXB);
590 aacirun->cr |= CR_EN;
591
592 ie = readl(aacirun->base + AACI_IE);
593 ie |= IE_URIE | IE_TXIE;
594 writel(ie, aacirun->base + AACI_IE);
595 writel(aacirun->cr, aacirun->base + AACI_TXCR);
596 }
597
598 static int aaci_pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
599 {
600 struct aaci_runtime *aacirun = substream->runtime->private_data;
601 unsigned long flags;
602 int ret = 0;
603
604 spin_lock_irqsave(&aacirun->lock, flags);
605
606 switch (cmd) {
607 case SNDRV_PCM_TRIGGER_START:
608 aaci_pcm_playback_start(aacirun);
609 break;
610
611 case SNDRV_PCM_TRIGGER_RESUME:
612 aaci_pcm_playback_start(aacirun);
613 break;
614
615 case SNDRV_PCM_TRIGGER_STOP:
616 aaci_pcm_playback_stop(aacirun);
617 break;
618
619 case SNDRV_PCM_TRIGGER_SUSPEND:
620 aaci_pcm_playback_stop(aacirun);
621 break;
622
623 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
624 break;
625
626 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
627 break;
628
629 default:
630 ret = -EINVAL;
631 }
632
633 spin_unlock_irqrestore(&aacirun->lock, flags);
634
635 return ret;
636 }
637
638 static struct snd_pcm_ops aaci_playback_ops = {
639 .open = aaci_pcm_open,
640 .close = aaci_pcm_close,
641 .ioctl = snd_pcm_lib_ioctl,
642 .hw_params = aaci_pcm_hw_params,
643 .hw_free = aaci_pcm_hw_free,
644 .prepare = aaci_pcm_prepare,
645 .trigger = aaci_pcm_playback_trigger,
646 .pointer = aaci_pcm_pointer,
647 };
648
649 static void aaci_pcm_capture_stop(struct aaci_runtime *aacirun)
650 {
651 u32 ie;
652
653 aaci_chan_wait_ready(aacirun, SR_RXB);
654
655 ie = readl(aacirun->base + AACI_IE);
656 ie &= ~(IE_ORIE | IE_RXIE);
657 writel(ie, aacirun->base+AACI_IE);
658
659 aacirun->cr &= ~CR_EN;
660
661 writel(aacirun->cr, aacirun->base + AACI_RXCR);
662 }
663
664 static void aaci_pcm_capture_start(struct aaci_runtime *aacirun)
665 {
666 u32 ie;
667
668 aaci_chan_wait_ready(aacirun, SR_RXB);
669
670 #ifdef DEBUG
671 /* RX Timeout value: bits 28:17 in RXCR */
672 aacirun->cr |= 0xf << 17;
673 #endif
674
675 aacirun->cr |= CR_EN;
676 writel(aacirun->cr, aacirun->base + AACI_RXCR);
677
678 ie = readl(aacirun->base + AACI_IE);
679 ie |= IE_ORIE |IE_RXIE; // overrun and rx interrupt -- half full
680 writel(ie, aacirun->base + AACI_IE);
681 }
682
683 static int aaci_pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
684 {
685 struct aaci_runtime *aacirun = substream->runtime->private_data;
686 unsigned long flags;
687 int ret = 0;
688
689 spin_lock_irqsave(&aacirun->lock, flags);
690
691 switch (cmd) {
692 case SNDRV_PCM_TRIGGER_START:
693 aaci_pcm_capture_start(aacirun);
694 break;
695
696 case SNDRV_PCM_TRIGGER_RESUME:
697 aaci_pcm_capture_start(aacirun);
698 break;
699
700 case SNDRV_PCM_TRIGGER_STOP:
701 aaci_pcm_capture_stop(aacirun);
702 break;
703
704 case SNDRV_PCM_TRIGGER_SUSPEND:
705 aaci_pcm_capture_stop(aacirun);
706 break;
707
708 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
709 break;
710
711 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
712 break;
713
714 default:
715 ret = -EINVAL;
716 }
717
718 spin_unlock_irqrestore(&aacirun->lock, flags);
719
720 return ret;
721 }
722
723 static int aaci_pcm_capture_prepare(struct snd_pcm_substream *substream)
724 {
725 struct snd_pcm_runtime *runtime = substream->runtime;
726 struct aaci *aaci = substream->private_data;
727
728 aaci_pcm_prepare(substream);
729
730 /* allow changing of sample rate */
731 aaci_ac97_write(aaci->ac97, AC97_EXTENDED_STATUS, 0x0001); /* VRA */
732 aaci_ac97_write(aaci->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
733 aaci_ac97_write(aaci->ac97, AC97_PCM_MIC_ADC_RATE, runtime->rate);
734
735 /* Record select: Mic: 0, Aux: 3, Line: 4 */
736 aaci_ac97_write(aaci->ac97, AC97_REC_SEL, 0x0404);
737
738 return 0;
739 }
740
741 static struct snd_pcm_ops aaci_capture_ops = {
742 .open = aaci_pcm_open,
743 .close = aaci_pcm_close,
744 .ioctl = snd_pcm_lib_ioctl,
745 .hw_params = aaci_pcm_hw_params,
746 .hw_free = aaci_pcm_hw_free,
747 .prepare = aaci_pcm_capture_prepare,
748 .trigger = aaci_pcm_capture_trigger,
749 .pointer = aaci_pcm_pointer,
750 };
751
752 /*
753 * Power Management.
754 */
755 #ifdef CONFIG_PM
756 static int aaci_do_suspend(struct snd_card *card, unsigned int state)
757 {
758 struct aaci *aaci = card->private_data;
759 snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
760 snd_pcm_suspend_all(aaci->pcm);
761 return 0;
762 }
763
764 static int aaci_do_resume(struct snd_card *card, unsigned int state)
765 {
766 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
767 return 0;
768 }
769
770 static int aaci_suspend(struct amba_device *dev, pm_message_t state)
771 {
772 struct snd_card *card = amba_get_drvdata(dev);
773 return card ? aaci_do_suspend(card) : 0;
774 }
775
776 static int aaci_resume(struct amba_device *dev)
777 {
778 struct snd_card *card = amba_get_drvdata(dev);
779 return card ? aaci_do_resume(card) : 0;
780 }
781 #else
782 #define aaci_do_suspend NULL
783 #define aaci_do_resume NULL
784 #define aaci_suspend NULL
785 #define aaci_resume NULL
786 #endif
787
788
789 static struct ac97_pcm ac97_defs[] __devinitdata = {
790 [0] = { /* Front PCM */
791 .exclusive = 1,
792 .r = {
793 [0] = {
794 .slots = (1 << AC97_SLOT_PCM_LEFT) |
795 (1 << AC97_SLOT_PCM_RIGHT) |
796 (1 << AC97_SLOT_PCM_CENTER) |
797 (1 << AC97_SLOT_PCM_SLEFT) |
798 (1 << AC97_SLOT_PCM_SRIGHT) |
799 (1 << AC97_SLOT_LFE),
800 },
801 [1] = {
802 .slots = (1 << AC97_SLOT_PCM_LEFT) |
803 (1 << AC97_SLOT_PCM_RIGHT) |
804 (1 << AC97_SLOT_PCM_LEFT_0) |
805 (1 << AC97_SLOT_PCM_RIGHT_0),
806 },
807 },
808 },
809 [1] = { /* PCM in */
810 .stream = 1,
811 .exclusive = 1,
812 .r = {
813 [0] = {
814 .slots = (1 << AC97_SLOT_PCM_LEFT) |
815 (1 << AC97_SLOT_PCM_RIGHT),
816 },
817 },
818 },
819 [2] = { /* Mic in */
820 .stream = 1,
821 .exclusive = 1,
822 .r = {
823 [0] = {
824 .slots = (1 << AC97_SLOT_MIC),
825 },
826 },
827 }
828 };
829
830 static struct snd_ac97_bus_ops aaci_bus_ops = {
831 .write = aaci_ac97_write,
832 .read = aaci_ac97_read,
833 };
834
835 static int __devinit aaci_probe_ac97(struct aaci *aaci)
836 {
837 struct snd_ac97_template ac97_template;
838 struct snd_ac97_bus *ac97_bus;
839 struct snd_ac97 *ac97;
840 int ret;
841
842 /*
843 * Assert AACIRESET for 2us
844 */
845 writel(0, aaci->base + AACI_RESET);
846 udelay(2);
847 writel(RESET_NRST, aaci->base + AACI_RESET);
848
849 /*
850 * Give the AC'97 codec more than enough time
851 * to wake up. (42us = ~2 frames at 48kHz.)
852 */
853 udelay(FRAME_PERIOD_US * 2);
854
855 ret = snd_ac97_bus(aaci->card, 0, &aaci_bus_ops, aaci, &ac97_bus);
856 if (ret)
857 goto out;
858
859 ac97_bus->clock = 48000;
860 aaci->ac97_bus = ac97_bus;
861
862 memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
863 ac97_template.private_data = aaci;
864 ac97_template.num = 0;
865 ac97_template.scaps = AC97_SCAP_SKIP_MODEM;
866
867 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97);
868 if (ret)
869 goto out;
870 aaci->ac97 = ac97;
871
872 /*
873 * Disable AC97 PC Beep input on audio codecs.
874 */
875 if (ac97_is_audio(ac97))
876 snd_ac97_write_cache(ac97, AC97_PC_BEEP, 0x801e);
877
878 ret = snd_ac97_pcm_assign(ac97_bus, ARRAY_SIZE(ac97_defs), ac97_defs);
879 if (ret)
880 goto out;
881
882 aaci->playback.pcm = &ac97_bus->pcms[0];
883 aaci->capture.pcm = &ac97_bus->pcms[1];
884
885 out:
886 return ret;
887 }
888
889 static void aaci_free_card(struct snd_card *card)
890 {
891 struct aaci *aaci = card->private_data;
892 if (aaci->base)
893 iounmap(aaci->base);
894 }
895
896 static struct aaci * __devinit aaci_init_card(struct amba_device *dev)
897 {
898 struct aaci *aaci;
899 struct snd_card *card;
900 int err;
901
902 err = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
903 THIS_MODULE, sizeof(struct aaci), &card);
904 if (err < 0)
905 return NULL;
906
907 card->private_free = aaci_free_card;
908
909 strlcpy(card->driver, DRIVER_NAME, sizeof(card->driver));
910 strlcpy(card->shortname, "ARM AC'97 Interface", sizeof(card->shortname));
911 snprintf(card->longname, sizeof(card->longname),
912 "%s PL%03x rev%u at 0x%08llx, irq %d",
913 card->shortname, amba_part(dev), amba_rev(dev),
914 (unsigned long long)dev->res.start, dev->irq[0]);
915
916 aaci = card->private_data;
917 mutex_init(&aaci->ac97_sem);
918 mutex_init(&aaci->irq_lock);
919 aaci->card = card;
920 aaci->dev = dev;
921
922 /* Set MAINCR to allow slot 1 and 2 data IO */
923 aaci->maincr = MAINCR_IE | MAINCR_SL1RXEN | MAINCR_SL1TXEN |
924 MAINCR_SL2RXEN | MAINCR_SL2TXEN;
925
926 return aaci;
927 }
928
929 static int __devinit aaci_init_pcm(struct aaci *aaci)
930 {
931 struct snd_pcm *pcm;
932 int ret;
933
934 ret = snd_pcm_new(aaci->card, "AACI AC'97", 0, 1, 1, &pcm);
935 if (ret == 0) {
936 aaci->pcm = pcm;
937 pcm->private_data = aaci;
938 pcm->info_flags = 0;
939
940 strlcpy(pcm->name, DRIVER_NAME, sizeof(pcm->name));
941
942 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &aaci_playback_ops);
943 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &aaci_capture_ops);
944 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
945 NULL, 0, 64 * 1024);
946 }
947
948 return ret;
949 }
950
951 static unsigned int __devinit aaci_size_fifo(struct aaci *aaci)
952 {
953 struct aaci_runtime *aacirun = &aaci->playback;
954 int i;
955
956 /*
957 * Enable the channel, but don't assign it to any slots, so
958 * it won't empty onto the AC'97 link.
959 */
960 writel(CR_FEN | CR_SZ16 | CR_EN, aacirun->base + AACI_TXCR);
961
962 for (i = 0; !(readl(aacirun->base + AACI_SR) & SR_TXFF) && i < 4096; i++)
963 writel(0, aacirun->fifo);
964
965 writel(0, aacirun->base + AACI_TXCR);
966
967 /*
968 * Re-initialise the AACI after the FIFO depth test, to
969 * ensure that the FIFOs are empty. Unfortunately, merely
970 * disabling the channel doesn't clear the FIFO.
971 */
972 writel(aaci->maincr & ~MAINCR_IE, aaci->base + AACI_MAINCR);
973 readl(aaci->base + AACI_MAINCR);
974 udelay(1);
975 writel(aaci->maincr, aaci->base + AACI_MAINCR);
976
977 /*
978 * If we hit 4096 entries, we failed. Go back to the specified
979 * fifo depth.
980 */
981 if (i == 4096)
982 i = 8;
983
984 return i;
985 }
986
987 static int __devinit aaci_probe(struct amba_device *dev,
988 const struct amba_id *id)
989 {
990 struct aaci *aaci;
991 int ret, i;
992
993 ret = amba_request_regions(dev, NULL);
994 if (ret)
995 return ret;
996
997 aaci = aaci_init_card(dev);
998 if (!aaci) {
999 ret = -ENOMEM;
1000 goto out;
1001 }
1002
1003 aaci->base = ioremap(dev->res.start, resource_size(&dev->res));
1004 if (!aaci->base) {
1005 ret = -ENOMEM;
1006 goto out;
1007 }
1008
1009 /*
1010 * Playback uses AACI channel 0
1011 */
1012 spin_lock_init(&aaci->playback.lock);
1013 aaci->playback.base = aaci->base + AACI_CSCH1;
1014 aaci->playback.fifo = aaci->base + AACI_DR1;
1015
1016 /*
1017 * Capture uses AACI channel 0
1018 */
1019 spin_lock_init(&aaci->capture.lock);
1020 aaci->capture.base = aaci->base + AACI_CSCH1;
1021 aaci->capture.fifo = aaci->base + AACI_DR1;
1022
1023 for (i = 0; i < 4; i++) {
1024 void __iomem *base = aaci->base + i * 0x14;
1025
1026 writel(0, base + AACI_IE);
1027 writel(0, base + AACI_TXCR);
1028 writel(0, base + AACI_RXCR);
1029 }
1030
1031 writel(0x1fff, aaci->base + AACI_INTCLR);
1032 writel(aaci->maincr, aaci->base + AACI_MAINCR);
1033 /*
1034 * Fix: ac97 read back fail errors by reading
1035 * from any arbitrary aaci register.
1036 */
1037 readl(aaci->base + AACI_CSCH1);
1038 ret = aaci_probe_ac97(aaci);
1039 if (ret)
1040 goto out;
1041
1042 /*
1043 * Size the FIFOs (must be multiple of 16).
1044 * This is the number of entries in the FIFO.
1045 */
1046 aaci->fifo_depth = aaci_size_fifo(aaci);
1047 if (aaci->fifo_depth & 15) {
1048 printk(KERN_WARNING "AACI: FIFO depth %d not supported\n",
1049 aaci->fifo_depth);
1050 ret = -ENODEV;
1051 goto out;
1052 }
1053
1054 ret = aaci_init_pcm(aaci);
1055 if (ret)
1056 goto out;
1057
1058 snd_card_set_dev(aaci->card, &dev->dev);
1059
1060 ret = snd_card_register(aaci->card);
1061 if (ret == 0) {
1062 dev_info(&dev->dev, "%s\n", aaci->card->longname);
1063 dev_info(&dev->dev, "FIFO %u entries\n", aaci->fifo_depth);
1064 amba_set_drvdata(dev, aaci->card);
1065 return ret;
1066 }
1067
1068 out:
1069 if (aaci)
1070 snd_card_free(aaci->card);
1071 amba_release_regions(dev);
1072 return ret;
1073 }
1074
1075 static int __devexit aaci_remove(struct amba_device *dev)
1076 {
1077 struct snd_card *card = amba_get_drvdata(dev);
1078
1079 amba_set_drvdata(dev, NULL);
1080
1081 if (card) {
1082 struct aaci *aaci = card->private_data;
1083 writel(0, aaci->base + AACI_MAINCR);
1084
1085 snd_card_free(card);
1086 amba_release_regions(dev);
1087 }
1088
1089 return 0;
1090 }
1091
1092 static struct amba_id aaci_ids[] = {
1093 {
1094 .id = 0x00041041,
1095 .mask = 0x000fffff,
1096 },
1097 { 0, 0 },
1098 };
1099
1100 static struct amba_driver aaci_driver = {
1101 .drv = {
1102 .name = DRIVER_NAME,
1103 },
1104 .probe = aaci_probe,
1105 .remove = __devexit_p(aaci_remove),
1106 .suspend = aaci_suspend,
1107 .resume = aaci_resume,
1108 .id_table = aaci_ids,
1109 };
1110
1111 static int __init aaci_init(void)
1112 {
1113 return amba_driver_register(&aaci_driver);
1114 }
1115
1116 static void __exit aaci_exit(void)
1117 {
1118 amba_driver_unregister(&aaci_driver);
1119 }
1120
1121 module_init(aaci_init);
1122 module_exit(aaci_exit);
1123
1124 MODULE_LICENSE("GPL");
1125 MODULE_DESCRIPTION("ARM PrimeCell PL041 Advanced Audio CODEC Interface driver");
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