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[PATCH] fuse: rename the interrupted flag
[pv_ops_mirror.git] / sound / arm / aaci.c
blob5f22d70fefc0fa114a7f9b12814f8c7a6b31b41e
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
22 #include <asm/io.h>
23 #include <asm/irq.h>
24 #include <asm/sizes.h>
25
26 #include <sound/driver.h>
27 #include <sound/core.h>
28 #include <sound/initval.h>
29 #include <sound/ac97_codec.h>
30 #include <sound/pcm.h>
31 #include <sound/pcm_params.h>
32
33 #include "aaci.h"
34 #include "devdma.h"
35
36 #define DRIVER_NAME "aaci-pl041"
37
38 /*
39 * PM support is not complete. Turn it off.
40 */
41 #undef CONFIG_PM
42
43 static void aaci_ac97_select_codec(struct aaci *aaci, struct snd_ac97 *ac97)
44 {
45 u32 v, maincr = aaci->maincr | MAINCR_SCRA(ac97->num);
46
47 /*
48 * Ensure that the slot 1/2 RX registers are empty.
49 */
50 v = readl(aaci->base + AACI_SLFR);
51 if (v & SLFR_2RXV)
52 readl(aaci->base + AACI_SL2RX);
53 if (v & SLFR_1RXV)
54 readl(aaci->base + AACI_SL1RX);
55
56 writel(maincr, aaci->base + AACI_MAINCR);
57 }
58
59 /*
60 * P29:
61 * The recommended use of programming the external codec through slot 1
62 * and slot 2 data is to use the channels during setup routines and the
63 * slot register at any other time. The data written into slot 1, slot 2
64 * and slot 12 registers is transmitted only when their corresponding
65 * SI1TxEn, SI2TxEn and SI12TxEn bits are set in the AACI_MAINCR
66 * register.
67 */
68 static void aaci_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val)
69 {
70 struct aaci *aaci = ac97->private_data;
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 /*
88 * Wait for the transmission of both slots to complete.
89 */
90 do {
91 v = readl(aaci->base + AACI_SLFR);
92 } while (v & (SLFR_1TXB|SLFR_2TXB));
93
94 mutex_unlock(&aaci->ac97_sem);
95 }
96
97 /*
98 * Read an AC'97 register.
99 */
100 static unsigned short aaci_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
101 {
102 struct aaci *aaci = ac97->private_data;
103 u32 v;
104
105 if (ac97->num >= 4)
106 return ~0;
107
108 mutex_lock(&aaci->ac97_sem);
109
110 aaci_ac97_select_codec(aaci, ac97);
111
112 /*
113 * Write the register address to slot 1.
114 */
115 writel((reg << 12) | (1 << 19), aaci->base + AACI_SL1TX);
116
117 /*
118 * Wait for the transmission to complete.
119 */
120 do {
121 v = readl(aaci->base + AACI_SLFR);
122 } while (v & SLFR_1TXB);
123
124 /*
125 * Give the AC'97 codec more than enough time
126 * to respond. (42us = ~2 frames at 48kHz.)
127 */
128 udelay(42);
129
130 /*
131 * Wait for slot 2 to indicate data.
132 */
133 do {
134 cond_resched();
135 v = readl(aaci->base + AACI_SLFR) & (SLFR_1RXV|SLFR_2RXV);
136 } while (v != (SLFR_1RXV|SLFR_2RXV));
137
138 v = readl(aaci->base + AACI_SL1RX) >> 12;
139 if (v == reg) {
140 v = readl(aaci->base + AACI_SL2RX) >> 4;
141 } else {
142 dev_err(&aaci->dev->dev,
143 "wrong ac97 register read back (%x != %x)\n",
144 v, reg);
145 v = ~0;
146 }
147
148 mutex_unlock(&aaci->ac97_sem);
149 return v;
150 }
151
152 static inline void aaci_chan_wait_ready(struct aaci_runtime *aacirun)
153 {
154 u32 val;
155 int timeout = 5000;
156
157 do {
158 val = readl(aacirun->base + AACI_SR);
159 } while (val & (SR_TXB|SR_RXB) && timeout--);
160 }
161
162
163
164 /*
165 * Interrupt support.
166 */
167 static void aaci_fifo_irq(struct aaci *aaci, u32 mask)
168 {
169 if (mask & ISR_URINTR) {
170 writel(ICLR_TXUEC1, aaci->base + AACI_INTCLR);
171 }
172
173 if (mask & ISR_TXINTR) {
174 struct aaci_runtime *aacirun = &aaci->playback;
175 void *ptr;
176
177 if (!aacirun->substream || !aacirun->start) {
178 dev_warn(&aaci->dev->dev, "TX interrupt???");
179 writel(0, aacirun->base + AACI_IE);
180 return;
181 }
182
183 ptr = aacirun->ptr;
184 do {
185 unsigned int len = aacirun->fifosz;
186 u32 val;
187
188 if (aacirun->bytes <= 0) {
189 aacirun->bytes += aacirun->period;
190 aacirun->ptr = ptr;
191 spin_unlock(&aaci->lock);
192 snd_pcm_period_elapsed(aacirun->substream);
193 spin_lock(&aaci->lock);
194 }
195 if (!(aacirun->cr & TXCR_TXEN))
196 break;
197
198 val = readl(aacirun->base + AACI_SR);
199 if (!(val & SR_TXHE))
200 break;
201 if (!(val & SR_TXFE))
202 len >>= 1;
203
204 aacirun->bytes -= len;
205
206 /* writing 16 bytes at a time */
207 for ( ; len > 0; len -= 16) {
208 asm(
209 "ldmia %0!, {r0, r1, r2, r3}\n\t"
210 "stmia %1, {r0, r1, r2, r3}"
211 : "+r" (ptr)
212 : "r" (aacirun->fifo)
213 : "r0", "r1", "r2", "r3", "cc");
214
215 if (ptr >= aacirun->end)
216 ptr = aacirun->start;
217 }
218 } while (1);
219
220 aacirun->ptr = ptr;
221 }
222 }
223
224 static irqreturn_t aaci_irq(int irq, void *devid, struct pt_regs *regs)
225 {
226 struct aaci *aaci = devid;
227 u32 mask;
228 int i;
229
230 spin_lock(&aaci->lock);
231 mask = readl(aaci->base + AACI_ALLINTS);
232 if (mask) {
233 u32 m = mask;
234 for (i = 0; i < 4; i++, m >>= 7) {
235 if (m & 0x7f) {
236 aaci_fifo_irq(aaci, m);
237 }
238 }
239 }
240 spin_unlock(&aaci->lock);
241
242 return mask ? IRQ_HANDLED : IRQ_NONE;
243 }
244
245
246
247 /*
248 * ALSA support.
249 */
250
251 struct aaci_stream {
252 unsigned char codec_idx;
253 unsigned char rate_idx;
254 };
255
256 static struct aaci_stream aaci_streams[] = {
257 [ACSTREAM_FRONT] = {
258 .codec_idx = 0,
259 .rate_idx = AC97_RATES_FRONT_DAC,
260 },
261 [ACSTREAM_SURROUND] = {
262 .codec_idx = 0,
263 .rate_idx = AC97_RATES_SURR_DAC,
264 },
265 [ACSTREAM_LFE] = {
266 .codec_idx = 0,
267 .rate_idx = AC97_RATES_LFE_DAC,
268 },
269 };
270
271 static inline unsigned int aaci_rate_mask(struct aaci *aaci, int streamid)
272 {
273 struct aaci_stream *s = aaci_streams + streamid;
274 return aaci->ac97_bus->codec[s->codec_idx]->rates[s->rate_idx];
275 }
276
277 static unsigned int rate_list[] = {
278 5512, 8000, 11025, 16000, 22050, 32000, 44100,
279 48000, 64000, 88200, 96000, 176400, 192000
280 };
281
282 /*
283 * Double-rate rule: we can support double rate iff channels == 2
284 * (unimplemented)
285 */
286 static int
287 aaci_rule_rate_by_channels(struct snd_pcm_hw_params *p, struct snd_pcm_hw_rule *rule)
288 {
289 struct aaci *aaci = rule->private;
290 unsigned int rate_mask = SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_5512;
291 struct snd_interval *c = hw_param_interval(p, SNDRV_PCM_HW_PARAM_CHANNELS);
292
293 switch (c->max) {
294 case 6:
295 rate_mask &= aaci_rate_mask(aaci, ACSTREAM_LFE);
296 case 4:
297 rate_mask &= aaci_rate_mask(aaci, ACSTREAM_SURROUND);
298 case 2:
299 rate_mask &= aaci_rate_mask(aaci, ACSTREAM_FRONT);
300 }
301
302 return snd_interval_list(hw_param_interval(p, rule->var),
303 ARRAY_SIZE(rate_list), rate_list,
304 rate_mask);
305 }
306
307 static struct snd_pcm_hardware aaci_hw_info = {
308 .info = SNDRV_PCM_INFO_MMAP |
309 SNDRV_PCM_INFO_MMAP_VALID |
310 SNDRV_PCM_INFO_INTERLEAVED |
311 SNDRV_PCM_INFO_BLOCK_TRANSFER |
312 SNDRV_PCM_INFO_RESUME,
313
314 /*
315 * ALSA doesn't support 18-bit or 20-bit packed into 32-bit
316 * words. It also doesn't support 12-bit at all.
317 */
318 .formats = SNDRV_PCM_FMTBIT_S16_LE,
319
320 /* should this be continuous or knot? */
321 .rates = SNDRV_PCM_RATE_CONTINUOUS,
322 .rate_max = 48000,
323 .rate_min = 4000,
324 .channels_min = 2,
325 .channels_max = 6,
326 .buffer_bytes_max = 64 * 1024,
327 .period_bytes_min = 256,
328 .period_bytes_max = PAGE_SIZE,
329 .periods_min = 4,
330 .periods_max = PAGE_SIZE / 16,
331 };
332
333 static int aaci_pcm_open(struct aaci *aaci, struct snd_pcm_substream *substream,
334 struct aaci_runtime *aacirun)
335 {
336 struct snd_pcm_runtime *runtime = substream->runtime;
337 int ret;
338
339 aacirun->substream = substream;
340 runtime->private_data = aacirun;
341 runtime->hw = aaci_hw_info;
342
343 /*
344 * FIXME: ALSA specifies fifo_size in bytes. If we're in normal
345 * mode, each 32-bit word contains one sample. If we're in
346 * compact mode, each 32-bit word contains two samples, effectively
347 * halving the FIFO size. However, we don't know for sure which
348 * we'll be using at this point. We set this to the lower limit.
349 */
350 runtime->hw.fifo_size = aaci->fifosize * 2;
351
352 /*
353 * Add rule describing hardware rate dependency
354 * on the number of channels.
355 */
356 ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
357 aaci_rule_rate_by_channels, aaci,
358 SNDRV_PCM_HW_PARAM_CHANNELS,
359 SNDRV_PCM_HW_PARAM_RATE, -1);
360 if (ret)
361 goto out;
362
363 ret = request_irq(aaci->dev->irq[0], aaci_irq, SA_SHIRQ|SA_INTERRUPT,
364 DRIVER_NAME, aaci);
365 if (ret)
366 goto out;
367
368 return 0;
369
370 out:
371 return ret;
372 }
373
374
375 /*
376 * Common ALSA stuff
377 */
378 static int aaci_pcm_close(struct snd_pcm_substream *substream)
379 {
380 struct aaci *aaci = substream->private_data;
381 struct aaci_runtime *aacirun = substream->runtime->private_data;
382
383 WARN_ON(aacirun->cr & TXCR_TXEN);
384
385 aacirun->substream = NULL;
386 free_irq(aaci->dev->irq[0], aaci);
387
388 return 0;
389 }
390
391 static int aaci_pcm_hw_free(struct snd_pcm_substream *substream)
392 {
393 struct aaci_runtime *aacirun = substream->runtime->private_data;
394
395 /*
396 * This must not be called with the device enabled.
397 */
398 WARN_ON(aacirun->cr & TXCR_TXEN);
399
400 if (aacirun->pcm_open)
401 snd_ac97_pcm_close(aacirun->pcm);
402 aacirun->pcm_open = 0;
403
404 /*
405 * Clear out the DMA and any allocated buffers.
406 */
407 devdma_hw_free(NULL, substream);
408
409 return 0;
410 }
411
412 static int aaci_pcm_hw_params(struct snd_pcm_substream *substream,
413 struct aaci_runtime *aacirun,
414 struct snd_pcm_hw_params *params)
415 {
416 int err;
417
418 aaci_pcm_hw_free(substream);
419
420 err = devdma_hw_alloc(NULL, substream,
421 params_buffer_bytes(params));
422 if (err < 0)
423 goto out;
424
425 err = snd_ac97_pcm_open(aacirun->pcm, params_rate(params),
426 params_channels(params),
427 aacirun->pcm->r[0].slots);
428 if (err)
429 goto out;
430
431 aacirun->pcm_open = 1;
432
433 out:
434 return err;
435 }
436
437 static int aaci_pcm_prepare(struct snd_pcm_substream *substream)
438 {
439 struct snd_pcm_runtime *runtime = substream->runtime;
440 struct aaci_runtime *aacirun = runtime->private_data;
441
442 aacirun->start = (void *)runtime->dma_area;
443 aacirun->end = aacirun->start + runtime->dma_bytes;
444 aacirun->ptr = aacirun->start;
445 aacirun->period =
446 aacirun->bytes = frames_to_bytes(runtime, runtime->period_size);
447
448 return 0;
449 }
450
451 static snd_pcm_uframes_t aaci_pcm_pointer(struct snd_pcm_substream *substream)
452 {
453 struct snd_pcm_runtime *runtime = substream->runtime;
454 struct aaci_runtime *aacirun = runtime->private_data;
455 ssize_t bytes = aacirun->ptr - aacirun->start;
456
457 return bytes_to_frames(runtime, bytes);
458 }
459
460 static int aaci_pcm_mmap(struct snd_pcm_substream *substream, struct vm_area_struct *vma)
461 {
462 return devdma_mmap(NULL, substream, vma);
463 }
464
465
466 /*
467 * Playback specific ALSA stuff
468 */
469 static const u32 channels_to_txmask[] = {
470 [2] = TXCR_TX3 | TXCR_TX4,
471 [4] = TXCR_TX3 | TXCR_TX4 | TXCR_TX7 | TXCR_TX8,
472 [6] = TXCR_TX3 | TXCR_TX4 | TXCR_TX7 | TXCR_TX8 | TXCR_TX6 | TXCR_TX9,
473 };
474
475 /*
476 * We can support two and four channel audio. Unfortunately
477 * six channel audio requires a non-standard channel ordering:
478 * 2 -> FL(3), FR(4)
479 * 4 -> FL(3), FR(4), SL(7), SR(8)
480 * 6 -> FL(3), FR(4), SL(7), SR(8), C(6), LFE(9) (required)
481 * FL(3), FR(4), C(6), SL(7), SR(8), LFE(9) (actual)
482 * This requires an ALSA configuration file to correct.
483 */
484 static unsigned int channel_list[] = { 2, 4, 6 };
485
486 static int
487 aaci_rule_channels(struct snd_pcm_hw_params *p, struct snd_pcm_hw_rule *rule)
488 {
489 struct aaci *aaci = rule->private;
490 unsigned int chan_mask = 1 << 0, slots;
491
492 /*
493 * pcms[0] is the our 5.1 PCM instance.
494 */
495 slots = aaci->ac97_bus->pcms[0].r[0].slots;
496 if (slots & (1 << AC97_SLOT_PCM_SLEFT)) {
497 chan_mask |= 1 << 1;
498 if (slots & (1 << AC97_SLOT_LFE))
499 chan_mask |= 1 << 2;
500 }
501
502 return snd_interval_list(hw_param_interval(p, rule->var),
503 ARRAY_SIZE(channel_list), channel_list,
504 chan_mask);
505 }
506
507 static int aaci_pcm_playback_open(struct snd_pcm_substream *substream)
508 {
509 struct aaci *aaci = substream->private_data;
510 int ret;
511
512 /*
513 * Add rule describing channel dependency.
514 */
515 ret = snd_pcm_hw_rule_add(substream->runtime, 0,
516 SNDRV_PCM_HW_PARAM_CHANNELS,
517 aaci_rule_channels, aaci,
518 SNDRV_PCM_HW_PARAM_CHANNELS, -1);
519 if (ret)
520 return ret;
521
522 return aaci_pcm_open(aaci, substream, &aaci->playback);
523 }
524
525 static int aaci_pcm_playback_hw_params(struct snd_pcm_substream *substream,
526 struct snd_pcm_hw_params *params)
527 {
528 struct aaci *aaci = substream->private_data;
529 struct aaci_runtime *aacirun = substream->runtime->private_data;
530 unsigned int channels = params_channels(params);
531 int ret;
532
533 WARN_ON(channels >= ARRAY_SIZE(channels_to_txmask) ||
534 !channels_to_txmask[channels]);
535
536 ret = aaci_pcm_hw_params(substream, aacirun, params);
537
538 /*
539 * Enable FIFO, compact mode, 16 bits per sample.
540 * FIXME: double rate slots?
541 */
542 if (ret >= 0) {
543 aacirun->cr = TXCR_FEN | TXCR_COMPACT | TXCR_TSZ16;
544 aacirun->cr |= channels_to_txmask[channels];
545
546 aacirun->fifosz = aaci->fifosize * 4;
547 if (aacirun->cr & TXCR_COMPACT)
548 aacirun->fifosz >>= 1;
549 }
550 return ret;
551 }
552
553 static void aaci_pcm_playback_stop(struct aaci_runtime *aacirun)
554 {
555 u32 ie;
556
557 ie = readl(aacirun->base + AACI_IE);
558 ie &= ~(IE_URIE|IE_TXIE);
559 writel(ie, aacirun->base + AACI_IE);
560 aacirun->cr &= ~TXCR_TXEN;
561 aaci_chan_wait_ready(aacirun);
562 writel(aacirun->cr, aacirun->base + AACI_TXCR);
563 }
564
565 static void aaci_pcm_playback_start(struct aaci_runtime *aacirun)
566 {
567 u32 ie;
568
569 aaci_chan_wait_ready(aacirun);
570 aacirun->cr |= TXCR_TXEN;
571
572 ie = readl(aacirun->base + AACI_IE);
573 ie |= IE_URIE | IE_TXIE;
574 writel(ie, aacirun->base + AACI_IE);
575 writel(aacirun->cr, aacirun->base + AACI_TXCR);
576 }
577
578 static int aaci_pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
579 {
580 struct aaci *aaci = substream->private_data;
581 struct aaci_runtime *aacirun = substream->runtime->private_data;
582 unsigned long flags;
583 int ret = 0;
584
585 spin_lock_irqsave(&aaci->lock, flags);
586 switch (cmd) {
587 case SNDRV_PCM_TRIGGER_START:
588 aaci_pcm_playback_start(aacirun);
589 break;
590
591 case SNDRV_PCM_TRIGGER_RESUME:
592 aaci_pcm_playback_start(aacirun);
593 break;
594
595 case SNDRV_PCM_TRIGGER_STOP:
596 aaci_pcm_playback_stop(aacirun);
597 break;
598
599 case SNDRV_PCM_TRIGGER_SUSPEND:
600 aaci_pcm_playback_stop(aacirun);
601 break;
602
603 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
604 break;
605
606 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
607 break;
608
609 default:
610 ret = -EINVAL;
611 }
612 spin_unlock_irqrestore(&aaci->lock, flags);
613
614 return ret;
615 }
616
617 static struct snd_pcm_ops aaci_playback_ops = {
618 .open = aaci_pcm_playback_open,
619 .close = aaci_pcm_close,
620 .ioctl = snd_pcm_lib_ioctl,
621 .hw_params = aaci_pcm_playback_hw_params,
622 .hw_free = aaci_pcm_hw_free,
623 .prepare = aaci_pcm_prepare,
624 .trigger = aaci_pcm_playback_trigger,
625 .pointer = aaci_pcm_pointer,
626 .mmap = aaci_pcm_mmap,
627 };
628
629
630
631 /*
632 * Power Management.
633 */
634 #ifdef CONFIG_PM
635 static int aaci_do_suspend(struct snd_card *card, unsigned int state)
636 {
637 struct aaci *aaci = card->private_data;
638 snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
639 snd_pcm_suspend_all(aaci->pcm);
640 return 0;
641 }
642
643 static int aaci_do_resume(struct snd_card *card, unsigned int state)
644 {
645 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
646 return 0;
647 }
648
649 static int aaci_suspend(struct amba_device *dev, pm_message_t state)
650 {
651 struct snd_card *card = amba_get_drvdata(dev);
652 return card ? aaci_do_suspend(card) : 0;
653 }
654
655 static int aaci_resume(struct amba_device *dev)
656 {
657 struct snd_card *card = amba_get_drvdata(dev);
658 return card ? aaci_do_resume(card) : 0;
659 }
660 #else
661 #define aaci_do_suspend NULL
662 #define aaci_do_resume NULL
663 #define aaci_suspend NULL
664 #define aaci_resume NULL
665 #endif
666
667
668 static struct ac97_pcm ac97_defs[] __devinitdata = {
669 [0] = { /* Front PCM */
670 .exclusive = 1,
671 .r = {
672 [0] = {
673 .slots = (1 << AC97_SLOT_PCM_LEFT) |
674 (1 << AC97_SLOT_PCM_RIGHT) |
675 (1 << AC97_SLOT_PCM_CENTER) |
676 (1 << AC97_SLOT_PCM_SLEFT) |
677 (1 << AC97_SLOT_PCM_SRIGHT) |
678 (1 << AC97_SLOT_LFE),
679 },
680 },
681 },
682 [1] = { /* PCM in */
683 .stream = 1,
684 .exclusive = 1,
685 .r = {
686 [0] = {
687 .slots = (1 << AC97_SLOT_PCM_LEFT) |
688 (1 << AC97_SLOT_PCM_RIGHT),
689 },
690 },
691 },
692 [2] = { /* Mic in */
693 .stream = 1,
694 .exclusive = 1,
695 .r = {
696 [0] = {
697 .slots = (1 << AC97_SLOT_MIC),
698 },
699 },
700 }
701 };
702
703 static struct snd_ac97_bus_ops aaci_bus_ops = {
704 .write = aaci_ac97_write,
705 .read = aaci_ac97_read,
706 };
707
708 static int __devinit aaci_probe_ac97(struct aaci *aaci)
709 {
710 struct snd_ac97_template ac97_template;
711 struct snd_ac97_bus *ac97_bus;
712 struct snd_ac97 *ac97;
713 int ret;
714
715 /*
716 * Assert AACIRESET for 2us
717 */
718 writel(0, aaci->base + AACI_RESET);
719 udelay(2);
720 writel(RESET_NRST, aaci->base + AACI_RESET);
721
722 /*
723 * Give the AC'97 codec more than enough time
724 * to wake up. (42us = ~2 frames at 48kHz.)
725 */
726 udelay(42);
727
728 ret = snd_ac97_bus(aaci->card, 0, &aaci_bus_ops, aaci, &ac97_bus);
729 if (ret)
730 goto out;
731
732 ac97_bus->clock = 48000;
733 aaci->ac97_bus = ac97_bus;
734
735 memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
736 ac97_template.private_data = aaci;
737 ac97_template.num = 0;
738 ac97_template.scaps = AC97_SCAP_SKIP_MODEM;
739
740 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97);
741 if (ret)
742 goto out;
743
744 /*
745 * Disable AC97 PC Beep input on audio codecs.
746 */
747 if (ac97_is_audio(ac97))
748 snd_ac97_write_cache(ac97, AC97_PC_BEEP, 0x801e);
749
750 ret = snd_ac97_pcm_assign(ac97_bus, ARRAY_SIZE(ac97_defs), ac97_defs);
751 if (ret)
752 goto out;
753
754 aaci->playback.pcm = &ac97_bus->pcms[0];
755
756 out:
757 return ret;
758 }
759
760 static void aaci_free_card(struct snd_card *card)
761 {
762 struct aaci *aaci = card->private_data;
763 if (aaci->base)
764 iounmap(aaci->base);
765 }
766
767 static struct aaci * __devinit aaci_init_card(struct amba_device *dev)
768 {
769 struct aaci *aaci;
770 struct snd_card *card;
771
772 card = snd_card_new(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
773 THIS_MODULE, sizeof(struct aaci));
774 if (card == NULL)
775 return ERR_PTR(-ENOMEM);
776
777 card->private_free = aaci_free_card;
778
779 strlcpy(card->driver, DRIVER_NAME, sizeof(card->driver));
780 strlcpy(card->shortname, "ARM AC'97 Interface", sizeof(card->shortname));
781 snprintf(card->longname, sizeof(card->longname),
782 "%s at 0x%08lx, irq %d",
783 card->shortname, dev->res.start, dev->irq[0]);
784
785 aaci = card->private_data;
786 mutex_init(&aaci->ac97_sem);
787 spin_lock_init(&aaci->lock);
788 aaci->card = card;
789 aaci->dev = dev;
790
791 /* Set MAINCR to allow slot 1 and 2 data IO */
792 aaci->maincr = MAINCR_IE | MAINCR_SL1RXEN | MAINCR_SL1TXEN |
793 MAINCR_SL2RXEN | MAINCR_SL2TXEN;
794
795 return aaci;
796 }
797
798 static int __devinit aaci_init_pcm(struct aaci *aaci)
799 {
800 struct snd_pcm *pcm;
801 int ret;
802
803 ret = snd_pcm_new(aaci->card, "AACI AC'97", 0, 1, 0, &pcm);
804 if (ret == 0) {
805 aaci->pcm = pcm;
806 pcm->private_data = aaci;
807 pcm->info_flags = 0;
808
809 strlcpy(pcm->name, DRIVER_NAME, sizeof(pcm->name));
810
811 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &aaci_playback_ops);
812 }
813
814 return ret;
815 }
816
817 static unsigned int __devinit aaci_size_fifo(struct aaci *aaci)
818 {
819 void __iomem *base = aaci->base + AACI_CSCH1;
820 int i;
821
822 writel(TXCR_FEN | TXCR_TSZ16 | TXCR_TXEN, base + AACI_TXCR);
823
824 for (i = 0; !(readl(base + AACI_SR) & SR_TXFF) && i < 4096; i++)
825 writel(0, aaci->base + AACI_DR1);
826
827 writel(0, base + AACI_TXCR);
828
829 /*
830 * Re-initialise the AACI after the FIFO depth test, to
831 * ensure that the FIFOs are empty. Unfortunately, merely
832 * disabling the channel doesn't clear the FIFO.
833 */
834 writel(aaci->maincr & ~MAINCR_IE, aaci->base + AACI_MAINCR);
835 writel(aaci->maincr, aaci->base + AACI_MAINCR);
836
837 /*
838 * If we hit 4096, we failed. Go back to the specified
839 * fifo depth.
840 */
841 if (i == 4096)
842 i = 8;
843
844 return i;
845 }
846
847 static int __devinit aaci_probe(struct amba_device *dev, void *id)
848 {
849 struct aaci *aaci;
850 int ret, i;
851
852 ret = amba_request_regions(dev, NULL);
853 if (ret)
854 return ret;
855
856 aaci = aaci_init_card(dev);
857 if (IS_ERR(aaci)) {
858 ret = PTR_ERR(aaci);
859 goto out;
860 }
861
862 aaci->base = ioremap(dev->res.start, SZ_4K);
863 if (!aaci->base) {
864 ret = -ENOMEM;
865 goto out;
866 }
867
868 /*
869 * Playback uses AACI channel 0
870 */
871 aaci->playback.base = aaci->base + AACI_CSCH1;
872 aaci->playback.fifo = aaci->base + AACI_DR1;
873
874 for (i = 0; i < 4; i++) {
875 void __iomem *base = aaci->base + i * 0x14;
876
877 writel(0, base + AACI_IE);
878 writel(0, base + AACI_TXCR);
879 writel(0, base + AACI_RXCR);
880 }
881
882 writel(0x1fff, aaci->base + AACI_INTCLR);
883 writel(aaci->maincr, aaci->base + AACI_MAINCR);
884
885 ret = aaci_probe_ac97(aaci);
886 if (ret)
887 goto out;
888
889 /*
890 * Size the FIFOs (must be multiple of 16).
891 */
892 aaci->fifosize = aaci_size_fifo(aaci);
893 if (aaci->fifosize & 15) {
894 printk(KERN_WARNING "AACI: fifosize = %d not supported\n",
895 aaci->fifosize);
896 ret = -ENODEV;
897 goto out;
898 }
899
900 ret = aaci_init_pcm(aaci);
901 if (ret)
902 goto out;
903
904 snd_card_set_dev(aaci->card, &dev->dev);
905
906 ret = snd_card_register(aaci->card);
907 if (ret == 0) {
908 dev_info(&dev->dev, "%s, fifo %d\n", aaci->card->longname,
909 aaci->fifosize);
910 amba_set_drvdata(dev, aaci->card);
911 return ret;
912 }
913
914 out:
915 if (aaci)
916 snd_card_free(aaci->card);
917 amba_release_regions(dev);
918 return ret;
919 }
920
921 static int __devexit aaci_remove(struct amba_device *dev)
922 {
923 struct snd_card *card = amba_get_drvdata(dev);
924
925 amba_set_drvdata(dev, NULL);
926
927 if (card) {
928 struct aaci *aaci = card->private_data;
929 writel(0, aaci->base + AACI_MAINCR);
930
931 snd_card_free(card);
932 amba_release_regions(dev);
933 }
934
935 return 0;
936 }
937
938 static struct amba_id aaci_ids[] = {
939 {
940 .id = 0x00041041,
941 .mask = 0x000fffff,
942 },
943 { 0, 0 },
944 };
945
946 static struct amba_driver aaci_driver = {
947 .drv = {
948 .name = DRIVER_NAME,
949 },
950 .probe = aaci_probe,
951 .remove = __devexit_p(aaci_remove),
952 .suspend = aaci_suspend,
953 .resume = aaci_resume,
954 .id_table = aaci_ids,
955 };
956
957 static int __init aaci_init(void)
958 {
959 return amba_driver_register(&aaci_driver);
960 }
961
962 static void __exit aaci_exit(void)
963 {
964 amba_driver_unregister(&aaci_driver);
965 }
966
967 module_init(aaci_init);
968 module_exit(aaci_exit);
969
970 MODULE_LICENSE("GPL");
971 MODULE_DESCRIPTION("ARM PrimeCell PL041 Advanced Audio CODEC Interface driver");
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