1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/sound/arm/aaci.c - ARM PrimeCell AACI PL041 driver
4 *
5 * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
6 *
7 * Documentation: ARM DDI 0173B
8 */
9 #include <linux/module.h>
10 #include <linux/delay.h>
11 #include <linux/init.h>
12 #include <linux/ioport.h>
13 #include <linux/device.h>
14 #include <linux/spinlock.h>
15 #include <linux/interrupt.h>
16 #include <linux/err.h>
17 #include <linux/amba/bus.h>
18 #include <linux/io.h>
19
20 #include <sound/core.h>
21 #include <sound/initval.h>
22 #include <sound/ac97_codec.h>
23 #include <sound/pcm.h>
24 #include <sound/pcm_params.h>
25
26 #include "aaci.h"
27
28 #define DRIVER_NAME "aaci-pl041"
29
30 #define FRAME_PERIOD_US 21
31
32 /*
33 * PM support is not complete. Turn it off.
34 */
35 #undef CONFIG_PM
36
37 static void aaci_ac97_select_codec(struct aaci *aaci, struct snd_ac97 *ac97)
38 {
39 u32 v, maincr = aaci->maincr | MAINCR_SCRA(ac97->num);
40
41 /*
42 * Ensure that the slot 1/2 RX registers are empty.
43 */
44 v = readl(aaci->base + AACI_SLFR);
45 if (v & SLFR_2RXV)
46 readl(aaci->base + AACI_SL2RX);
47 if (v & SLFR_1RXV)
48 readl(aaci->base + AACI_SL1RX);
49
50 if (maincr != readl(aaci->base + AACI_MAINCR)) {
51 writel(maincr, aaci->base + AACI_MAINCR);
52 readl(aaci->base + AACI_MAINCR);
53 udelay(1);
54 }
55 }
56
57 /*
58 * P29:
59 * The recommended use of programming the external codec through slot 1
60 * and slot 2 data is to use the channels during setup routines and the
61 * slot register at any other time. The data written into slot 1, slot 2
62 * and slot 12 registers is transmitted only when their corresponding
63 * SI1TxEn, SI2TxEn and SI12TxEn bits are set in the AACI_MAINCR
64 * register.
65 */
66 static void aaci_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
67 unsigned short val)
68 {
69 struct aaci *aaci = ac97->private_data;
70 int timeout;
71 u32 v;
72
73 if (ac97->num >= 4)
74 return;
75
76 mutex_lock(&aaci->ac97_sem);
77
78 aaci_ac97_select_codec(aaci, ac97);
79
80 /*
81 * P54: You must ensure that AACI_SL2TX is always written
82 * to, if required, before data is written to AACI_SL1TX.
83 */
84 writel(val << 4, aaci->base + AACI_SL2TX);
85 writel(reg << 12, aaci->base + AACI_SL1TX);
86
87 /* Initially, wait one frame period */
88 udelay(FRAME_PERIOD_US);
89
90 /* And then wait an additional eight frame periods for it to be sent */
91 timeout = FRAME_PERIOD_US * 8;
92 do {
93 udelay(1);
94 v = readl(aaci->base + AACI_SLFR);
95 } while ((v & (SLFR_1TXB|SLFR_2TXB)) && --timeout);
96
97 if (v & (SLFR_1TXB|SLFR_2TXB))
98 dev_err(&aaci->dev->dev,
99 "timeout waiting for write to complete\n");
100
101 mutex_unlock(&aaci->ac97_sem);
102 }
103
104 /*
105 * Read an AC'97 register.
106 */
107 static unsigned short aaci_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
108 {
109 struct aaci *aaci = ac97->private_data;
110 int timeout, retries = 10;
111 u32 v;
112
113 if (ac97->num >= 4)
114 return ~0;
115
116 mutex_lock(&aaci->ac97_sem);
117
118 aaci_ac97_select_codec(aaci, ac97);
119
120 /*
121 * Write the register address to slot 1.
122 */
123 writel((reg << 12) | (1 << 19), aaci->base + AACI_SL1TX);
124
125 /* Initially, wait one frame period */
126 udelay(FRAME_PERIOD_US);
127
128 /* And then wait an additional eight frame periods for it to be sent */
129 timeout = FRAME_PERIOD_US * 8;
130 do {
131 udelay(1);
132 v = readl(aaci->base + AACI_SLFR);
133 } while ((v & SLFR_1TXB) && --timeout);
134
135 if (v & SLFR_1TXB) {
136 dev_err(&aaci->dev->dev, "timeout on slot 1 TX busy\n");
137 v = ~0;
138 goto out;
139 }
140
141 /* Now wait for the response frame */
142 udelay(FRAME_PERIOD_US);
143
144 /* And then wait an additional eight frame periods for data */
145 timeout = FRAME_PERIOD_US * 8;
146 do {
147 udelay(1);
148 cond_resched();
149 v = readl(aaci->base + AACI_SLFR) & (SLFR_1RXV|SLFR_2RXV);
150 } while ((v != (SLFR_1RXV|SLFR_2RXV)) && --timeout);
151
152 if (v != (SLFR_1RXV|SLFR_2RXV)) {
153 dev_err(&aaci->dev->dev, "timeout on RX valid\n");
154 v = ~0;
155 goto out;
156 }
157
158 do {
159 v = readl(aaci->base + AACI_SL1RX) >> 12;
160 if (v == reg) {
161 v = readl(aaci->base + AACI_SL2RX) >> 4;
162 break;
163 } else if (--retries) {
164 dev_warn(&aaci->dev->dev,
165 "ac97 read back fail. retry\n");
166 continue;
167 } else {
168 dev_warn(&aaci->dev->dev,
169 "wrong ac97 register read back (%x != %x)\n",
170 v, reg);
171 v = ~0;
172 }
173 } while (retries);
174 out:
175 mutex_unlock(&aaci->ac97_sem);
176 return v;
177 }
178
179 static inline void
180 aaci_chan_wait_ready(struct aaci_runtime *aacirun, unsigned long mask)
181 {
182 u32 val;
183 int timeout = 5000;
184
185 do {
186 udelay(1);
187 val = readl(aacirun->base + AACI_SR);
188 } while (val & mask && timeout--);
189 }
190
191
192
193 /*
194 * Interrupt support.
195 */
196 static void aaci_fifo_irq(struct aaci *aaci, int channel, u32 mask)
197 {
198 if (mask & ISR_ORINTR) {
199 dev_warn(&aaci->dev->dev, "RX overrun on chan %d\n", channel);
200 writel(ICLR_RXOEC1 << channel, aaci->base + AACI_INTCLR);
201 }
202
203 if (mask & ISR_RXTOINTR) {
204 dev_warn(&aaci->dev->dev, "RX timeout on chan %d\n", channel);
205 writel(ICLR_RXTOFEC1 << channel, aaci->base + AACI_INTCLR);
206 }
207
208 if (mask & ISR_RXINTR) {
209 struct aaci_runtime *aacirun = &aaci->capture;
210 bool period_elapsed = false;
211 void *ptr;
212
213 if (!aacirun->substream || !aacirun->start) {
214 dev_warn(&aaci->dev->dev, "RX interrupt???\n");
215 writel(0, aacirun->base + AACI_IE);
216 return;
217 }
218
219 spin_lock(&aacirun->lock);
220
221 ptr = aacirun->ptr;
222 do {
223 unsigned int len = aacirun->fifo_bytes;
224 u32 val;
225
226 if (aacirun->bytes <= 0) {
227 aacirun->bytes += aacirun->period;
228 period_elapsed = true;
229 }
230 if (!(aacirun->cr & CR_EN))
231 break;
232
233 val = readl(aacirun->base + AACI_SR);
234 if (!(val & SR_RXHF))
235 break;
236 if (!(val & SR_RXFF))
237 len >>= 1;
238
239 aacirun->bytes -= len;
240
241 /* reading 16 bytes at a time */
242 for( ; len > 0; len -= 16) {
243 asm(
244 "ldmia %1, {r0, r1, r2, r3}\n\t"
245 "stmia %0!, {r0, r1, r2, r3}"
246 : "+r" (ptr)
247 : "r" (aacirun->fifo)
248 : "r0", "r1", "r2", "r3", "cc");
249
250 if (ptr >= aacirun->end)
251 ptr = aacirun->start;
252 }
253 } while(1);
254
255 aacirun->ptr = ptr;
256
257 spin_unlock(&aacirun->lock);
258
259 if (period_elapsed)
260 snd_pcm_period_elapsed(aacirun->substream);
261 }
262
263 if (mask & ISR_URINTR) {
264 dev_dbg(&aaci->dev->dev, "TX underrun on chan %d\n", channel);
265 writel(ICLR_TXUEC1 << channel, aaci->base + AACI_INTCLR);
266 }
267
268 if (mask & ISR_TXINTR) {
269 struct aaci_runtime *aacirun = &aaci->playback;
270 bool period_elapsed = false;
271 void *ptr;
272
273 if (!aacirun->substream || !aacirun->start) {
274 dev_warn(&aaci->dev->dev, "TX interrupt???\n");
275 writel(0, aacirun->base + AACI_IE);
276 return;
277 }
278
279 spin_lock(&aacirun->lock);
280
281 ptr = aacirun->ptr;
282 do {
283 unsigned int len = aacirun->fifo_bytes;
284 u32 val;
285
286 if (aacirun->bytes <= 0) {
287 aacirun->bytes += aacirun->period;
288 period_elapsed = true;
289 }
290 if (!(aacirun->cr & CR_EN))
291 break;
292
293 val = readl(aacirun->base + AACI_SR);
294 if (!(val & SR_TXHE))
295 break;
296 if (!(val & SR_TXFE))
297 len >>= 1;
298
299 aacirun->bytes -= len;
300
301 /* writing 16 bytes at a time */
302 for ( ; len > 0; len -= 16) {
303 asm(
304 "ldmia %0!, {r0, r1, r2, r3}\n\t"
305 "stmia %1, {r0, r1, r2, r3}"
306 : "+r" (ptr)
307 : "r" (aacirun->fifo)
308 : "r0", "r1", "r2", "r3", "cc");
309
310 if (ptr >= aacirun->end)
311 ptr = aacirun->start;
312 }
313 } while (1);
314
315 aacirun->ptr = ptr;
316
317 spin_unlock(&aacirun->lock);
318
319 if (period_elapsed)
320 snd_pcm_period_elapsed(aacirun->substream);
321 }
322 }
323
324 static irqreturn_t aaci_irq(int irq, void *devid)
325 {
326 struct aaci *aaci = devid;
327 u32 mask;
328 int i;
329
330 mask = readl(aaci->base + AACI_ALLINTS);
331 if (mask) {
332 u32 m = mask;
333 for (i = 0; i < 4; i++, m >>= 7) {
334 if (m & 0x7f) {
335 aaci_fifo_irq(aaci, i, m);
336 }
337 }
338 }
339
340 return mask ? IRQ_HANDLED : IRQ_NONE;
341 }
342
343
344
345 /*
346 * ALSA support.
347 */
348 static const struct snd_pcm_hardware aaci_hw_info = {
349 .info = SNDRV_PCM_INFO_MMAP |
350 SNDRV_PCM_INFO_MMAP_VALID |
351 SNDRV_PCM_INFO_INTERLEAVED |
352 SNDRV_PCM_INFO_BLOCK_TRANSFER |
353 SNDRV_PCM_INFO_RESUME,
354
355 /*
356 * ALSA doesn't support 18-bit or 20-bit packed into 32-bit
357 * words. It also doesn't support 12-bit at all.
358 */
359 .formats = SNDRV_PCM_FMTBIT_S16_LE,
360
361 /* rates are setup from the AC'97 codec */
362 .channels_min = 2,
363 .channels_max = 2,
364 .buffer_bytes_max = 64 * 1024,
365 .period_bytes_min = 256,
366 .period_bytes_max = PAGE_SIZE,
367 .periods_min = 4,
368 .periods_max = PAGE_SIZE / 16,
369 };
370
371 /*
372 * We can support two and four channel audio. Unfortunately
373 * six channel audio requires a non-standard channel ordering:
374 * 2 -> FL(3), FR(4)
375 * 4 -> FL(3), FR(4), SL(7), SR(8)
376 * 6 -> FL(3), FR(4), SL(7), SR(8), C(6), LFE(9) (required)
377 * FL(3), FR(4), C(6), SL(7), SR(8), LFE(9) (actual)
378 * This requires an ALSA configuration file to correct.
379 */
380 static int aaci_rule_channels(struct snd_pcm_hw_params *p,
381 struct snd_pcm_hw_rule *rule)
382 {
383 static const unsigned int channel_list[] = { 2, 4, 6 };
384 struct aaci *aaci = rule->private;
385 unsigned int mask = 1 << 0, slots;
386
387 /* pcms[0] is the our 5.1 PCM instance. */
388 slots = aaci->ac97_bus->pcms[0].r[0].slots;
389 if (slots & (1 << AC97_SLOT_PCM_SLEFT)) {
390 mask |= 1 << 1;
391 if (slots & (1 << AC97_SLOT_LFE))
392 mask |= 1 << 2;
393 }
394
395 return snd_interval_list(hw_param_interval(p, rule->var),
396 ARRAY_SIZE(channel_list), channel_list, mask);
397 }
398
399 static int aaci_pcm_open(struct snd_pcm_substream *substream)
400 {
401 struct snd_pcm_runtime *runtime = substream->runtime;
402 struct aaci *aaci = substream->private_data;
403 struct aaci_runtime *aacirun;
404 int ret = 0;
405
406 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
407 aacirun = &aaci->playback;
408 } else {
409 aacirun = &aaci->capture;
410 }
411
412 aacirun->substream = substream;
413 runtime->private_data = aacirun;
414 runtime->hw = aaci_hw_info;
415 runtime->hw.rates = aacirun->pcm->rates;
416 snd_pcm_limit_hw_rates(runtime);
417
418 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
419 runtime->hw.channels_max = 6;
420
421 /* Add rule describing channel dependency. */
422 ret = snd_pcm_hw_rule_add(substream->runtime, 0,
423 SNDRV_PCM_HW_PARAM_CHANNELS,
424 aaci_rule_channels, aaci,
425 SNDRV_PCM_HW_PARAM_CHANNELS, -1);
426 if (ret)
427 return ret;
428
429 if (aacirun->pcm->r[1].slots)
430 snd_ac97_pcm_double_rate_rules(runtime);
431 }
432
433 /*
434 * ALSA wants the byte-size of the FIFOs. As we only support
435 * 16-bit samples, this is twice the FIFO depth irrespective
436 * of whether it's in compact mode or not.
437 */
438 runtime->hw.fifo_size = aaci->fifo_depth * 2;
439
440 mutex_lock(&aaci->irq_lock);
441 if (!aaci->users++) {
442 ret = request_irq(aaci->dev->irq[0], aaci_irq,
443 IRQF_SHARED, DRIVER_NAME, aaci);
444 if (ret != 0)
445 aaci->users--;
446 }
447 mutex_unlock(&aaci->irq_lock);
448
449 return ret;
450 }
451
452
453 /*
454 * Common ALSA stuff
455 */
456 static int aaci_pcm_close(struct snd_pcm_substream *substream)
457 {
458 struct aaci *aaci = substream->private_data;
459 struct aaci_runtime *aacirun = substream->runtime->private_data;
460
461 WARN_ON(aacirun->cr & CR_EN);
462
463 aacirun->substream = NULL;
464
465 mutex_lock(&aaci->irq_lock);
466 if (!--aaci->users)
467 free_irq(aaci->dev->irq[0], aaci);
468 mutex_unlock(&aaci->irq_lock);
469
470 return 0;
471 }
472
473 static int aaci_pcm_hw_free(struct snd_pcm_substream *substream)
474 {
475 struct aaci_runtime *aacirun = substream->runtime->private_data;
476
477 /*
478 * This must not be called with the device enabled.
479 */
480 WARN_ON(aacirun->cr & CR_EN);
481
482 if (aacirun->pcm_open)
483 snd_ac97_pcm_close(aacirun->pcm);
484 aacirun->pcm_open = 0;
485
486 return 0;
487 }
488
489 /* Channel to slot mask */
490 static const u32 channels_to_slotmask[] = {
491 [2] = CR_SL3 | CR_SL4,
492 [4] = CR_SL3 | CR_SL4 | CR_SL7 | CR_SL8,
493 [6] = CR_SL3 | CR_SL4 | CR_SL7 | CR_SL8 | CR_SL6 | CR_SL9,
494 };
495
496 static int aaci_pcm_hw_params(struct snd_pcm_substream *substream,
497 struct snd_pcm_hw_params *params)
498 {
499 struct aaci_runtime *aacirun = substream->runtime->private_data;
500 struct aaci *aaci = substream->private_data;
501 unsigned int channels = params_channels(params);
502 unsigned int rate = params_rate(params);
503 int dbl = rate > 48000;
504 int err;
505
506 aaci_pcm_hw_free(substream);
507 if (aacirun->pcm_open) {
508 snd_ac97_pcm_close(aacirun->pcm);
509 aacirun->pcm_open = 0;
510 }
511
512 /* channels is already limited to 2, 4, or 6 by aaci_rule_channels */
513 if (dbl && channels != 2)
514 return -EINVAL;
515
516 err = snd_ac97_pcm_open(aacirun->pcm, rate, channels,
517 aacirun->pcm->r[dbl].slots);
518
519 aacirun->pcm_open = err == 0;
520 aacirun->cr = CR_FEN | CR_COMPACT | CR_SZ16;
521 aacirun->cr |= channels_to_slotmask[channels + dbl * 2];
522
523 /*
524 * fifo_bytes is the number of bytes we transfer to/from
525 * the FIFO, including padding. So that's x4. As we're
526 * in compact mode, the FIFO is half the size.
527 */
528 aacirun->fifo_bytes = aaci->fifo_depth * 4 / 2;
529
530 return err;
531 }
532
533 static int aaci_pcm_prepare(struct snd_pcm_substream *substream)
534 {
535 struct snd_pcm_runtime *runtime = substream->runtime;
536 struct aaci_runtime *aacirun = runtime->private_data;
537
538 aacirun->period = snd_pcm_lib_period_bytes(substream);
539 aacirun->start = runtime->dma_area;
540 aacirun->end = aacirun->start + snd_pcm_lib_buffer_bytes(substream);
541 aacirun->ptr = aacirun->start;
542 aacirun->bytes = aacirun->period;
543
544 return 0;
545 }
546
547 static snd_pcm_uframes_t aaci_pcm_pointer(struct snd_pcm_substream *substream)
548 {
549 struct snd_pcm_runtime *runtime = substream->runtime;
550 struct aaci_runtime *aacirun = runtime->private_data;
551 ssize_t bytes = aacirun->ptr - aacirun->start;
552
553 return bytes_to_frames(runtime, bytes);
554 }
555
556
557 /*
558 * Playback specific ALSA stuff
559 */
560 static void aaci_pcm_playback_stop(struct aaci_runtime *aacirun)
561 {
562 u32 ie;
563
564 ie = readl(aacirun->base + AACI_IE);
565 ie &= ~(IE_URIE|IE_TXIE);
566 writel(ie, aacirun->base + AACI_IE);
567 aacirun->cr &= ~CR_EN;
568 aaci_chan_wait_ready(aacirun, SR_TXB);
569 writel(aacirun->cr, aacirun->base + AACI_TXCR);
570 }
571
572 static void aaci_pcm_playback_start(struct aaci_runtime *aacirun)
573 {
574 u32 ie;
575
576 aaci_chan_wait_ready(aacirun, SR_TXB);
577 aacirun->cr |= CR_EN;
578
579 ie = readl(aacirun->base + AACI_IE);
580 ie |= IE_URIE | IE_TXIE;
581 writel(ie, aacirun->base + AACI_IE);
582 writel(aacirun->cr, aacirun->base + AACI_TXCR);
583 }
584
585 static int aaci_pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
586 {
587 struct aaci_runtime *aacirun = substream->runtime->private_data;
588 unsigned long flags;
589 int ret = 0;
590
591 spin_lock_irqsave(&aacirun->lock, flags);
592
593 switch (cmd) {
594 case SNDRV_PCM_TRIGGER_START:
595 aaci_pcm_playback_start(aacirun);
596 break;
597
598 case SNDRV_PCM_TRIGGER_RESUME:
599 aaci_pcm_playback_start(aacirun);
600 break;
601
602 case SNDRV_PCM_TRIGGER_STOP:
603 aaci_pcm_playback_stop(aacirun);
604 break;
605
606 case SNDRV_PCM_TRIGGER_SUSPEND:
607 aaci_pcm_playback_stop(aacirun);
608 break;
609
610 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
611 break;
612
613 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
614 break;
615
616 default:
617 ret = -EINVAL;
618 }
619
620 spin_unlock_irqrestore(&aacirun->lock, flags);
621
622 return ret;
623 }
624
625 static const struct snd_pcm_ops aaci_playback_ops = {
626 .open = aaci_pcm_open,
627 .close = aaci_pcm_close,
628 .hw_params = aaci_pcm_hw_params,
629 .hw_free = aaci_pcm_hw_free,
630 .prepare = aaci_pcm_prepare,
631 .trigger = aaci_pcm_playback_trigger,
632 .pointer = aaci_pcm_pointer,
633 };
634
635 static void aaci_pcm_capture_stop(struct aaci_runtime *aacirun)
636 {
637 u32 ie;
638
639 aaci_chan_wait_ready(aacirun, SR_RXB);
640
641 ie = readl(aacirun->base + AACI_IE);
642 ie &= ~(IE_ORIE | IE_RXIE);
643 writel(ie, aacirun->base+AACI_IE);
644
645 aacirun->cr &= ~CR_EN;
646
647 writel(aacirun->cr, aacirun->base + AACI_RXCR);
648 }
649
650 static void aaci_pcm_capture_start(struct aaci_runtime *aacirun)
651 {
652 u32 ie;
653
654 aaci_chan_wait_ready(aacirun, SR_RXB);
655
656 #ifdef DEBUG
657 /* RX Timeout value: bits 28:17 in RXCR */
658 aacirun->cr |= 0xf << 17;
659 #endif
660
661 aacirun->cr |= CR_EN;
662 writel(aacirun->cr, aacirun->base + AACI_RXCR);
663
664 ie = readl(aacirun->base + AACI_IE);
665 ie |= IE_ORIE |IE_RXIE; // overrun and rx interrupt -- half full
666 writel(ie, aacirun->base + AACI_IE);
667 }
668
669 static int aaci_pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
670 {
671 struct aaci_runtime *aacirun = substream->runtime->private_data;
672 unsigned long flags;
673 int ret = 0;
674
675 spin_lock_irqsave(&aacirun->lock, flags);
676
677 switch (cmd) {
678 case SNDRV_PCM_TRIGGER_START:
679 aaci_pcm_capture_start(aacirun);
680 break;
681
682 case SNDRV_PCM_TRIGGER_RESUME:
683 aaci_pcm_capture_start(aacirun);
684 break;
685
686 case SNDRV_PCM_TRIGGER_STOP:
687 aaci_pcm_capture_stop(aacirun);
688 break;
689
690 case SNDRV_PCM_TRIGGER_SUSPEND:
691 aaci_pcm_capture_stop(aacirun);
692 break;
693
694 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
695 break;
696
697 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
698 break;
699
700 default:
701 ret = -EINVAL;
702 }
703
704 spin_unlock_irqrestore(&aacirun->lock, flags);
705
706 return ret;
707 }
708
709 static int aaci_pcm_capture_prepare(struct snd_pcm_substream *substream)
710 {
711 struct snd_pcm_runtime *runtime = substream->runtime;
712 struct aaci *aaci = substream->private_data;
713
714 aaci_pcm_prepare(substream);
715
716 /* allow changing of sample rate */
717 aaci_ac97_write(aaci->ac97, AC97_EXTENDED_STATUS, 0x0001); /* VRA */
718 aaci_ac97_write(aaci->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
719 aaci_ac97_write(aaci->ac97, AC97_PCM_MIC_ADC_RATE, runtime->rate);
720
721 /* Record select: Mic: 0, Aux: 3, Line: 4 */
722 aaci_ac97_write(aaci->ac97, AC97_REC_SEL, 0x0404);
723
724 return 0;
725 }
726
727 static const struct snd_pcm_ops aaci_capture_ops = {
728 .open = aaci_pcm_open,
729 .close = aaci_pcm_close,
730 .hw_params = aaci_pcm_hw_params,
731 .hw_free = aaci_pcm_hw_free,
732 .prepare = aaci_pcm_capture_prepare,
733 .trigger = aaci_pcm_capture_trigger,
734 .pointer = aaci_pcm_pointer,
735 };
736
737 /*
738 * Power Management.
739 */
740 static int aaci_do_suspend(struct snd_card *card)
741 {
742 snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
743 return 0;
744 }
745
746 static int aaci_do_resume(struct snd_card *card)
747 {
748 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
749 return 0;
750 }
751
752 static int aaci_suspend(struct device *dev)
753 {
754 struct snd_card *card = dev_get_drvdata(dev);
755 return card ? aaci_do_suspend(card) : 0;
756 }
757
758 static int aaci_resume(struct device *dev)
759 {
760 struct snd_card *card = dev_get_drvdata(dev);
761 return card ? aaci_do_resume(card) : 0;
762 }
763
764 static DEFINE_SIMPLE_DEV_PM_OPS(aaci_dev_pm_ops, aaci_suspend, aaci_resume);
765
766 static const struct ac97_pcm ac97_defs[] = {
767 [0] = { /* Front PCM */
768 .exclusive = 1,
769 .r = {
770 [0] = {
771 .slots = (1 << AC97_SLOT_PCM_LEFT) |
772 (1 << AC97_SLOT_PCM_RIGHT) |
773 (1 << AC97_SLOT_PCM_CENTER) |
774 (1 << AC97_SLOT_PCM_SLEFT) |
775 (1 << AC97_SLOT_PCM_SRIGHT) |
776 (1 << AC97_SLOT_LFE),
777 },
778 [1] = {
779 .slots = (1 << AC97_SLOT_PCM_LEFT) |
780 (1 << AC97_SLOT_PCM_RIGHT) |
781 (1 << AC97_SLOT_PCM_LEFT_0) |
782 (1 << AC97_SLOT_PCM_RIGHT_0),
783 },
784 },
785 },
786 [1] = { /* PCM in */
787 .stream = 1,
788 .exclusive = 1,
789 .r = {
790 [0] = {
791 .slots = (1 << AC97_SLOT_PCM_LEFT) |
792 (1 << AC97_SLOT_PCM_RIGHT),
793 },
794 },
795 },
796 [2] = { /* Mic in */
797 .stream = 1,
798 .exclusive = 1,
799 .r = {
800 [0] = {
801 .slots = (1 << AC97_SLOT_MIC),
802 },
803 },
804 }
805 };
806
807 static const struct snd_ac97_bus_ops aaci_bus_ops = {
808 .write = aaci_ac97_write,
809 .read = aaci_ac97_read,
810 };
811
812 static int aaci_probe_ac97(struct aaci *aaci)
813 {
814 struct snd_ac97_template ac97_template;
815 struct snd_ac97_bus *ac97_bus;
816 struct snd_ac97 *ac97;
817 int ret;
818
819 /*
820 * Assert AACIRESET for 2us
821 */
822 writel(0, aaci->base + AACI_RESET);
823 udelay(2);
824 writel(RESET_NRST, aaci->base + AACI_RESET);
825
826 /*
827 * Give the AC'97 codec more than enough time
828 * to wake up. (42us = ~2 frames at 48kHz.)
829 */
830 udelay(FRAME_PERIOD_US * 2);
831
832 ret = snd_ac97_bus(aaci->card, 0, &aaci_bus_ops, aaci, &ac97_bus);
833 if (ret)
834 goto out;
835
836 ac97_bus->clock = 48000;
837 aaci->ac97_bus = ac97_bus;
838
839 memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
840 ac97_template.private_data = aaci;
841 ac97_template.num = 0;
842 ac97_template.scaps = AC97_SCAP_SKIP_MODEM;
843
844 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97);
845 if (ret)
846 goto out;
847 aaci->ac97 = ac97;
848
849 /*
850 * Disable AC97 PC Beep input on audio codecs.
851 */
852 if (ac97_is_audio(ac97))
853 snd_ac97_write_cache(ac97, AC97_PC_BEEP, 0x801e);
854
855 ret = snd_ac97_pcm_assign(ac97_bus, ARRAY_SIZE(ac97_defs), ac97_defs);
856 if (ret)
857 goto out;
858
859 aaci->playback.pcm = &ac97_bus->pcms[0];
860 aaci->capture.pcm = &ac97_bus->pcms[1];
861
862 out:
863 return ret;
864 }
865
866 static void aaci_free_card(struct snd_card *card)
867 {
868 struct aaci *aaci = card->private_data;
869
870 iounmap(aaci->base);
871 }
872
873 static struct aaci *aaci_init_card(struct amba_device *dev)
874 {
875 struct aaci *aaci;
876 struct snd_card *card;
877 int err;
878
879 err = snd_card_new(&dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
880 THIS_MODULE, sizeof(struct aaci), &card);
881 if (err < 0)
882 return NULL;
883
884 card->private_free = aaci_free_card;
885
886 strscpy(card->driver, DRIVER_NAME, sizeof(card->driver));
887 strscpy(card->shortname, "ARM AC'97 Interface", sizeof(card->shortname));
888 snprintf(card->longname, sizeof(card->longname),
889 "%s PL%03x rev%u at 0x%08llx, irq %d",
890 card->shortname, amba_part(dev), amba_rev(dev),
891 (unsigned long long)dev->res.start, dev->irq[0]);
892
893 aaci = card->private_data;
894 mutex_init(&aaci->ac97_sem);
895 mutex_init(&aaci->irq_lock);
896 aaci->card = card;
897 aaci->dev = dev;
898
899 /* Set MAINCR to allow slot 1 and 2 data IO */
900 aaci->maincr = MAINCR_IE | MAINCR_SL1RXEN | MAINCR_SL1TXEN |
901 MAINCR_SL2RXEN | MAINCR_SL2TXEN;
902
903 return aaci;
904 }
905
906 static int aaci_init_pcm(struct aaci *aaci)
907 {
908 struct snd_pcm *pcm;
909 int ret;
910
911 ret = snd_pcm_new(aaci->card, "AACI AC'97", 0, 1, 1, &pcm);
912 if (ret == 0) {
913 aaci->pcm = pcm;
914 pcm->private_data = aaci;
915 pcm->info_flags = 0;
916
917 strscpy(pcm->name, DRIVER_NAME, sizeof(pcm->name));
918
919 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &aaci_playback_ops);
920 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &aaci_capture_ops);
921 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
922 aaci->card->dev,
923 0, 64 * 1024);
924 }
925
926 return ret;
927 }
928
929 static unsigned int aaci_size_fifo(struct aaci *aaci)
930 {
931 struct aaci_runtime *aacirun = &aaci->playback;
932 int i;
933
934 /*
935 * Enable the channel, but don't assign it to any slots, so
936 * it won't empty onto the AC'97 link.
937 */
938 writel(CR_FEN | CR_SZ16 | CR_EN, aacirun->base + AACI_TXCR);
939
940 for (i = 0; !(readl(aacirun->base + AACI_SR) & SR_TXFF) && i < 4096; i++)
941 writel(0, aacirun->fifo);
942
943 writel(0, aacirun->base + AACI_TXCR);
944
945 /*
946 * Re-initialise the AACI after the FIFO depth test, to
947 * ensure that the FIFOs are empty. Unfortunately, merely
948 * disabling the channel doesn't clear the FIFO.
949 */
950 writel(aaci->maincr & ~MAINCR_IE, aaci->base + AACI_MAINCR);
951 readl(aaci->base + AACI_MAINCR);
952 udelay(1);
953 writel(aaci->maincr, aaci->base + AACI_MAINCR);
954
955 /*
956 * If we hit 4096 entries, we failed. Go back to the specified
957 * fifo depth.
958 */
959 if (i == 4096)
960 i = 8;
961
962 return i;
963 }
964
965 static int aaci_probe(struct amba_device *dev,
966 const struct amba_id *id)
967 {
968 struct aaci *aaci;
969 int ret, i;
970
971 ret = amba_request_regions(dev, NULL);
972 if (ret)
973 return ret;
974
975 aaci = aaci_init_card(dev);
976 if (!aaci) {
977 ret = -ENOMEM;
978 goto out;
979 }
980
981 aaci->base = ioremap(dev->res.start, resource_size(&dev->res));
982 if (!aaci->base) {
983 ret = -ENOMEM;
984 goto out;
985 }
986
987 /*
988 * Playback uses AACI channel 0
989 */
990 spin_lock_init(&aaci->playback.lock);
991 aaci->playback.base = aaci->base + AACI_CSCH1;
992 aaci->playback.fifo = aaci->base + AACI_DR1;
993
994 /*
995 * Capture uses AACI channel 0
996 */
997 spin_lock_init(&aaci->capture.lock);
998 aaci->capture.base = aaci->base + AACI_CSCH1;
999 aaci->capture.fifo = aaci->base + AACI_DR1;
1000
1001 for (i = 0; i < 4; i++) {
1002 void __iomem *base = aaci->base + i * 0x14;
1003
1004 writel(0, base + AACI_IE);
1005 writel(0, base + AACI_TXCR);
1006 writel(0, base + AACI_RXCR);
1007 }
1008
1009 writel(0x1fff, aaci->base + AACI_INTCLR);
1010 writel(aaci->maincr, aaci->base + AACI_MAINCR);
1011 /*
1012 * Fix: ac97 read back fail errors by reading
1013 * from any arbitrary aaci register.
1014 */
1015 readl(aaci->base + AACI_CSCH1);
1016 ret = aaci_probe_ac97(aaci);
1017 if (ret)
1018 goto out;
1019
1020 /*
1021 * Size the FIFOs (must be multiple of 16).
1022 * This is the number of entries in the FIFO.
1023 */
1024 aaci->fifo_depth = aaci_size_fifo(aaci);
1025 if (aaci->fifo_depth & 15) {
1026 printk(KERN_WARNING "AACI: FIFO depth %d not supported\n",
1027 aaci->fifo_depth);
1028 ret = -ENODEV;
1029 goto out;
1030 }
1031
1032 ret = aaci_init_pcm(aaci);
1033 if (ret)
1034 goto out;
1035
1036 ret = snd_card_register(aaci->card);
1037 if (ret == 0) {
1038 dev_info(&dev->dev, "%s\n", aaci->card->longname);
1039 dev_info(&dev->dev, "FIFO %u entries\n", aaci->fifo_depth);
1040 amba_set_drvdata(dev, aaci->card);
1041 return ret;
1042 }
1043
1044 out:
1045 if (aaci)
1046 snd_card_free(aaci->card);
1047 amba_release_regions(dev);
1048 return ret;
1049 }
1050
1051 static void aaci_remove(struct amba_device *dev)
1052 {
1053 struct snd_card *card = amba_get_drvdata(dev);
1054
1055 if (card) {
1056 struct aaci *aaci = card->private_data;
1057 writel(0, aaci->base + AACI_MAINCR);
1058
1059 snd_card_free(card);
1060 amba_release_regions(dev);
1061 }
1062 }
1063
1064 static struct amba_id aaci_ids[] = {
1065 {
1066 .id = 0x00041041,
1067 .mask = 0x000fffff,
1068 },
1069 { 0, 0 },
1070 };
1071
1072 MODULE_DEVICE_TABLE(amba, aaci_ids);
1073
1074 static struct amba_driver aaci_driver = {
1075 .drv = {
1076 .name = DRIVER_NAME,
1077 .pm = &aaci_dev_pm_ops,
1078 },
1079 .probe = aaci_probe,
1080 .remove = aaci_remove,
1081 .id_table = aaci_ids,
1082 };
1083
1084 module_amba_driver(aaci_driver);
1085
1086 MODULE_LICENSE("GPL");
1087 MODULE_DESCRIPTION("ARM PrimeCell PL041 Advanced Audio CODEC Interface driver");
1088
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.