1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Driver for Atmel AC97C
4 *
5 * Copyright (C) 2005-2009 Atmel Corporation
6 */
7#include <linux/clk.h>
8#include <linux/delay.h>
9#include <linux/bitmap.h>
10#include <linux/device.h>
11#include <linux/atmel_pdc.h>
12#include <linux/gpio/consumer.h>
13#include <linux/init.h>
14#include <linux/interrupt.h>
15#include <linux/mod_devicetable.h>
16#include <linux/module.h>
17#include <linux/platform_device.h>
18#include <linux/mutex.h>
19#include <linux/string.h>
20#include <linux/types.h>
21#include <linux/io.h>
22
23#include <sound/core.h>
24#include <sound/initval.h>
25#include <sound/pcm.h>
26#include <sound/pcm_params.h>
27#include <sound/ac97_codec.h>
28#include <sound/memalloc.h>
29
30#include "ac97c.h"
31
32/* Serialize access to opened variable */
33static DEFINE_MUTEX(opened_mutex);
34
35struct atmel_ac97c {
36 struct clk *pclk;
37 struct platform_device *pdev;
38
39 struct snd_pcm_substream *playback_substream;
40 struct snd_pcm_substream *capture_substream;
41 struct snd_card *card;
42 struct snd_pcm *pcm;
43 struct snd_ac97 *ac97;
44 struct snd_ac97_bus *ac97_bus;
45
46 u64 cur_format;
47 unsigned int cur_rate;
48 int playback_period, capture_period;
49 /* Serialize access to opened variable */
50 spinlock_t lock;
51 void __iomem *regs;
52 int irq;
53 int opened;
54 struct gpio_desc *reset_pin;
55};
56
57#define get_chip(card) ((struct atmel_ac97c *)(card)->private_data)
58
59#define ac97c_writel(chip, reg, val) \
60 __raw_writel((val), (chip)->regs + AC97C_##reg)
61#define ac97c_readl(chip, reg) \
62 __raw_readl((chip)->regs + AC97C_##reg)
63
64static const struct snd_pcm_hardware atmel_ac97c_hw = {
65 .info = (SNDRV_PCM_INFO_MMAP
66 | SNDRV_PCM_INFO_MMAP_VALID
67 | SNDRV_PCM_INFO_INTERLEAVED
68 | SNDRV_PCM_INFO_BLOCK_TRANSFER
69 | SNDRV_PCM_INFO_JOINT_DUPLEX
70 | SNDRV_PCM_INFO_RESUME
71 | SNDRV_PCM_INFO_PAUSE),
72 .formats = (SNDRV_PCM_FMTBIT_S16_BE
73 | SNDRV_PCM_FMTBIT_S16_LE),
74 .rates = (SNDRV_PCM_RATE_CONTINUOUS),
75 .rate_min = 4000,
76 .rate_max = 48000,
77 .channels_min = 1,
78 .channels_max = 2,
79 .buffer_bytes_max = 2 * 2 * 64 * 2048,
80 .period_bytes_min = 4096,
81 .period_bytes_max = 4096,
82 .periods_min = 6,
83 .periods_max = 64,
84};
85
86static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream)
87{
88 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
89 struct snd_pcm_runtime *runtime = substream->runtime;
90
91 guard(mutex)(T: &opened_mutex);
92 chip->opened++;
93 runtime->hw = atmel_ac97c_hw;
94 if (chip->cur_rate) {
95 runtime->hw.rate_min = chip->cur_rate;
96 runtime->hw.rate_max = chip->cur_rate;
97 }
98 if (chip->cur_format)
99 runtime->hw.formats = pcm_format_to_bits(pcm_format: chip->cur_format);
100 chip->playback_substream = substream;
101 return 0;
102}
103
104static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream)
105{
106 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
107 struct snd_pcm_runtime *runtime = substream->runtime;
108
109 guard(mutex)(T: &opened_mutex);
110 chip->opened++;
111 runtime->hw = atmel_ac97c_hw;
112 if (chip->cur_rate) {
113 runtime->hw.rate_min = chip->cur_rate;
114 runtime->hw.rate_max = chip->cur_rate;
115 }
116 if (chip->cur_format)
117 runtime->hw.formats = pcm_format_to_bits(pcm_format: chip->cur_format);
118 chip->capture_substream = substream;
119 return 0;
120}
121
122static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream)
123{
124 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
125
126 guard(mutex)(T: &opened_mutex);
127 chip->opened--;
128 if (!chip->opened) {
129 chip->cur_rate = 0;
130 chip->cur_format = 0;
131 }
132
133 chip->playback_substream = NULL;
134
135 return 0;
136}
137
138static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream)
139{
140 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
141
142 guard(mutex)(T: &opened_mutex);
143 chip->opened--;
144 if (!chip->opened) {
145 chip->cur_rate = 0;
146 chip->cur_format = 0;
147 }
148
149 chip->capture_substream = NULL;
150
151 return 0;
152}
153
154static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream,
155 struct snd_pcm_hw_params *hw_params)
156{
157 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
158
159 /* Set restrictions to params. */
160 guard(mutex)(T: &opened_mutex);
161 chip->cur_rate = params_rate(p: hw_params);
162 chip->cur_format = params_format(p: hw_params);
163
164 return 0;
165}
166
167static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream,
168 struct snd_pcm_hw_params *hw_params)
169{
170 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
171
172 /* Set restrictions to params. */
173 guard(mutex)(T: &opened_mutex);
174 chip->cur_rate = params_rate(p: hw_params);
175 chip->cur_format = params_format(p: hw_params);
176
177 return 0;
178}
179
180static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
181{
182 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
183 struct snd_pcm_runtime *runtime = substream->runtime;
184 int block_size = frames_to_bytes(runtime, size: runtime->period_size);
185 unsigned long word = ac97c_readl(chip, OCA);
186 int retval;
187
188 chip->playback_period = 0;
189 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
190
191 /* assign channels to AC97C channel A */
192 switch (runtime->channels) {
193 case 1:
194 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
195 break;
196 case 2:
197 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
198 | AC97C_CH_ASSIGN(PCM_RIGHT, A);
199 break;
200 default:
201 /* TODO: support more than two channels */
202 return -EINVAL;
203 }
204 ac97c_writel(chip, OCA, word);
205
206 /* configure sample format and size */
207 word = ac97c_readl(chip, CAMR);
208 if (chip->opened <= 1)
209 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
210 else
211 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
212
213 switch (runtime->format) {
214 case SNDRV_PCM_FORMAT_S16_LE:
215 break;
216 case SNDRV_PCM_FORMAT_S16_BE:
217 word &= ~(AC97C_CMR_CEM_LITTLE);
218 break;
219 default:
220 word = ac97c_readl(chip, OCA);
221 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
222 ac97c_writel(chip, OCA, word);
223 return -EINVAL;
224 }
225
226 /* Enable underrun interrupt on channel A */
227 word |= AC97C_CSR_UNRUN;
228
229 ac97c_writel(chip, CAMR, word);
230
231 /* Enable channel A event interrupt */
232 word = ac97c_readl(chip, IMR);
233 word |= AC97C_SR_CAEVT;
234 ac97c_writel(chip, IER, word);
235
236 /* set variable rate if needed */
237 if (runtime->rate != 48000) {
238 word = ac97c_readl(chip, MR);
239 word |= AC97C_MR_VRA;
240 ac97c_writel(chip, MR, word);
241 } else {
242 word = ac97c_readl(chip, MR);
243 word &= ~(AC97C_MR_VRA);
244 ac97c_writel(chip, MR, word);
245 }
246
247 retval = snd_ac97_set_rate(ac97: chip->ac97, AC97_PCM_FRONT_DAC_RATE,
248 rate: runtime->rate);
249 if (retval)
250 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
251 runtime->rate);
252
253 /* Initialize and start the PDC */
254 writel(val: runtime->dma_addr, addr: chip->regs + ATMEL_PDC_TPR);
255 writel(val: block_size / 2, addr: chip->regs + ATMEL_PDC_TCR);
256 writel(val: runtime->dma_addr + block_size, addr: chip->regs + ATMEL_PDC_TNPR);
257 writel(val: block_size / 2, addr: chip->regs + ATMEL_PDC_TNCR);
258
259 return retval;
260}
261
262static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
263{
264 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
265 struct snd_pcm_runtime *runtime = substream->runtime;
266 int block_size = frames_to_bytes(runtime, size: runtime->period_size);
267 unsigned long word = ac97c_readl(chip, ICA);
268 int retval;
269
270 chip->capture_period = 0;
271 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
272
273 /* assign channels to AC97C channel A */
274 switch (runtime->channels) {
275 case 1:
276 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
277 break;
278 case 2:
279 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
280 | AC97C_CH_ASSIGN(PCM_RIGHT, A);
281 break;
282 default:
283 /* TODO: support more than two channels */
284 return -EINVAL;
285 }
286 ac97c_writel(chip, ICA, word);
287
288 /* configure sample format and size */
289 word = ac97c_readl(chip, CAMR);
290 if (chip->opened <= 1)
291 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
292 else
293 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
294
295 switch (runtime->format) {
296 case SNDRV_PCM_FORMAT_S16_LE:
297 break;
298 case SNDRV_PCM_FORMAT_S16_BE:
299 word &= ~(AC97C_CMR_CEM_LITTLE);
300 break;
301 default:
302 word = ac97c_readl(chip, ICA);
303 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
304 ac97c_writel(chip, ICA, word);
305 return -EINVAL;
306 }
307
308 /* Enable overrun interrupt on channel A */
309 word |= AC97C_CSR_OVRUN;
310
311 ac97c_writel(chip, CAMR, word);
312
313 /* Enable channel A event interrupt */
314 word = ac97c_readl(chip, IMR);
315 word |= AC97C_SR_CAEVT;
316 ac97c_writel(chip, IER, word);
317
318 /* set variable rate if needed */
319 if (runtime->rate != 48000) {
320 word = ac97c_readl(chip, MR);
321 word |= AC97C_MR_VRA;
322 ac97c_writel(chip, MR, word);
323 } else {
324 word = ac97c_readl(chip, MR);
325 word &= ~(AC97C_MR_VRA);
326 ac97c_writel(chip, MR, word);
327 }
328
329 retval = snd_ac97_set_rate(ac97: chip->ac97, AC97_PCM_LR_ADC_RATE,
330 rate: runtime->rate);
331 if (retval)
332 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
333 runtime->rate);
334
335 /* Initialize and start the PDC */
336 writel(val: runtime->dma_addr, addr: chip->regs + ATMEL_PDC_RPR);
337 writel(val: block_size / 2, addr: chip->regs + ATMEL_PDC_RCR);
338 writel(val: runtime->dma_addr + block_size, addr: chip->regs + ATMEL_PDC_RNPR);
339 writel(val: block_size / 2, addr: chip->regs + ATMEL_PDC_RNCR);
340
341 return retval;
342}
343
344static int
345atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
346{
347 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
348 unsigned long camr, ptcr = 0;
349
350 camr = ac97c_readl(chip, CAMR);
351
352 switch (cmd) {
353 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
354 case SNDRV_PCM_TRIGGER_RESUME:
355 case SNDRV_PCM_TRIGGER_START:
356 ptcr = ATMEL_PDC_TXTEN;
357 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX;
358 break;
359 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
360 case SNDRV_PCM_TRIGGER_SUSPEND:
361 case SNDRV_PCM_TRIGGER_STOP:
362 ptcr |= ATMEL_PDC_TXTDIS;
363 if (chip->opened <= 1)
364 camr &= ~AC97C_CMR_CENA;
365 break;
366 default:
367 return -EINVAL;
368 }
369
370 ac97c_writel(chip, CAMR, camr);
371 writel(val: ptcr, addr: chip->regs + ATMEL_PDC_PTCR);
372 return 0;
373}
374
375static int
376atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
377{
378 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
379 unsigned long camr, ptcr = 0;
380
381 camr = ac97c_readl(chip, CAMR);
382 ptcr = readl(addr: chip->regs + ATMEL_PDC_PTSR);
383
384 switch (cmd) {
385 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
386 case SNDRV_PCM_TRIGGER_RESUME:
387 case SNDRV_PCM_TRIGGER_START:
388 ptcr = ATMEL_PDC_RXTEN;
389 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX;
390 break;
391 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
392 case SNDRV_PCM_TRIGGER_SUSPEND:
393 case SNDRV_PCM_TRIGGER_STOP:
394 ptcr |= ATMEL_PDC_RXTDIS;
395 if (chip->opened <= 1)
396 camr &= ~AC97C_CMR_CENA;
397 break;
398 default:
399 return -EINVAL;
400 }
401
402 ac97c_writel(chip, CAMR, camr);
403 writel(val: ptcr, addr: chip->regs + ATMEL_PDC_PTCR);
404 return 0;
405}
406
407static snd_pcm_uframes_t
408atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream)
409{
410 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
411 struct snd_pcm_runtime *runtime = substream->runtime;
412 snd_pcm_uframes_t frames;
413 unsigned long bytes;
414
415 bytes = readl(addr: chip->regs + ATMEL_PDC_TPR);
416 bytes -= runtime->dma_addr;
417
418 frames = bytes_to_frames(runtime, size: bytes);
419 if (frames >= runtime->buffer_size)
420 frames -= runtime->buffer_size;
421 return frames;
422}
423
424static snd_pcm_uframes_t
425atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream)
426{
427 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
428 struct snd_pcm_runtime *runtime = substream->runtime;
429 snd_pcm_uframes_t frames;
430 unsigned long bytes;
431
432 bytes = readl(addr: chip->regs + ATMEL_PDC_RPR);
433 bytes -= runtime->dma_addr;
434
435 frames = bytes_to_frames(runtime, size: bytes);
436 if (frames >= runtime->buffer_size)
437 frames -= runtime->buffer_size;
438 return frames;
439}
440
441static const struct snd_pcm_ops atmel_ac97_playback_ops = {
442 .open = atmel_ac97c_playback_open,
443 .close = atmel_ac97c_playback_close,
444 .hw_params = atmel_ac97c_playback_hw_params,
445 .prepare = atmel_ac97c_playback_prepare,
446 .trigger = atmel_ac97c_playback_trigger,
447 .pointer = atmel_ac97c_playback_pointer,
448};
449
450static const struct snd_pcm_ops atmel_ac97_capture_ops = {
451 .open = atmel_ac97c_capture_open,
452 .close = atmel_ac97c_capture_close,
453 .hw_params = atmel_ac97c_capture_hw_params,
454 .prepare = atmel_ac97c_capture_prepare,
455 .trigger = atmel_ac97c_capture_trigger,
456 .pointer = atmel_ac97c_capture_pointer,
457};
458
459static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
460{
461 struct atmel_ac97c *chip = (struct atmel_ac97c *)dev;
462 irqreturn_t retval = IRQ_NONE;
463 u32 sr = ac97c_readl(chip, SR);
464 u32 casr = ac97c_readl(chip, CASR);
465 u32 cosr = ac97c_readl(chip, COSR);
466 u32 camr = ac97c_readl(chip, CAMR);
467
468 if (sr & AC97C_SR_CAEVT) {
469 struct snd_pcm_runtime *runtime;
470 int offset, next_period, block_size;
471 dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n",
472 (casr & AC97C_CSR_OVRUN) ? " OVRUN" : "",
473 (casr & AC97C_CSR_RXRDY) ? " RXRDY" : "",
474 (casr & AC97C_CSR_UNRUN) ? " UNRUN" : "",
475 (casr & AC97C_CSR_TXEMPTY) ? " TXEMPTY" : "",
476 (casr & AC97C_CSR_TXRDY) ? " TXRDY" : "",
477 !casr ? " NONE" : "");
478 if ((casr & camr) & AC97C_CSR_ENDTX) {
479 runtime = chip->playback_substream->runtime;
480 block_size = frames_to_bytes(runtime, size: runtime->period_size);
481 chip->playback_period++;
482
483 if (chip->playback_period == runtime->periods)
484 chip->playback_period = 0;
485 next_period = chip->playback_period + 1;
486 if (next_period == runtime->periods)
487 next_period = 0;
488
489 offset = block_size * next_period;
490
491 writel(val: runtime->dma_addr + offset, addr: chip->regs + ATMEL_PDC_TNPR);
492 writel(val: block_size / 2, addr: chip->regs + ATMEL_PDC_TNCR);
493
494 snd_pcm_period_elapsed(substream: chip->playback_substream);
495 }
496 if ((casr & camr) & AC97C_CSR_ENDRX) {
497 runtime = chip->capture_substream->runtime;
498 block_size = frames_to_bytes(runtime, size: runtime->period_size);
499 chip->capture_period++;
500
501 if (chip->capture_period == runtime->periods)
502 chip->capture_period = 0;
503 next_period = chip->capture_period + 1;
504 if (next_period == runtime->periods)
505 next_period = 0;
506
507 offset = block_size * next_period;
508
509 writel(val: runtime->dma_addr + offset, addr: chip->regs + ATMEL_PDC_RNPR);
510 writel(val: block_size / 2, addr: chip->regs + ATMEL_PDC_RNCR);
511 snd_pcm_period_elapsed(substream: chip->capture_substream);
512 }
513 retval = IRQ_HANDLED;
514 }
515
516 if (sr & AC97C_SR_COEVT) {
517 dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n",
518 (cosr & AC97C_CSR_OVRUN) ? " OVRUN" : "",
519 (cosr & AC97C_CSR_RXRDY) ? " RXRDY" : "",
520 (cosr & AC97C_CSR_TXEMPTY) ? " TXEMPTY" : "",
521 (cosr & AC97C_CSR_TXRDY) ? " TXRDY" : "",
522 !cosr ? " NONE" : "");
523 retval = IRQ_HANDLED;
524 }
525
526 if (retval == IRQ_NONE) {
527 dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x "
528 "casr 0x%08x cosr 0x%08x\n", sr, casr, cosr);
529 }
530
531 return retval;
532}
533
534static const struct ac97_pcm at91_ac97_pcm_defs[] = {
535 /* Playback */
536 {
537 .exclusive = 1,
538 .r = { {
539 .slots = ((1 << AC97_SLOT_PCM_LEFT)
540 | (1 << AC97_SLOT_PCM_RIGHT)),
541 } },
542 },
543 /* PCM in */
544 {
545 .stream = 1,
546 .exclusive = 1,
547 .r = { {
548 .slots = ((1 << AC97_SLOT_PCM_LEFT)
549 | (1 << AC97_SLOT_PCM_RIGHT)),
550 } }
551 },
552 /* Mic in */
553 {
554 .stream = 1,
555 .exclusive = 1,
556 .r = { {
557 .slots = (1<<AC97_SLOT_MIC),
558 } }
559 },
560};
561
562static int atmel_ac97c_pcm_new(struct atmel_ac97c *chip)
563{
564 struct snd_pcm *pcm;
565 struct snd_pcm_hardware hw = atmel_ac97c_hw;
566 int retval;
567
568 retval = snd_ac97_pcm_assign(ac97: chip->ac97_bus,
569 ARRAY_SIZE(at91_ac97_pcm_defs),
570 pcms: at91_ac97_pcm_defs);
571 if (retval)
572 return retval;
573
574 retval = snd_pcm_new(card: chip->card, id: chip->card->shortname, device: 0, playback_count: 1, capture_count: 1, rpcm: &pcm);
575 if (retval)
576 return retval;
577
578 snd_pcm_set_ops(pcm, direction: SNDRV_PCM_STREAM_CAPTURE, ops: &atmel_ac97_capture_ops);
579 snd_pcm_set_ops(pcm, direction: SNDRV_PCM_STREAM_PLAYBACK, ops: &atmel_ac97_playback_ops);
580
581 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
582 data: &chip->pdev->dev, size: hw.periods_min * hw.period_bytes_min,
583 max: hw.buffer_bytes_max);
584
585 pcm->private_data = chip;
586 pcm->info_flags = 0;
587 strscpy(pcm->name, chip->card->shortname);
588 chip->pcm = pcm;
589
590 return 0;
591}
592
593static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip)
594{
595 struct snd_ac97_template template;
596 memset(&template, 0, sizeof(template));
597 template.private_data = chip;
598 return snd_ac97_mixer(bus: chip->ac97_bus, template: &template, rac97: &chip->ac97);
599}
600
601static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg,
602 unsigned short val)
603{
604 struct atmel_ac97c *chip = get_chip(ac97);
605 unsigned long word;
606 int timeout = 40;
607
608 word = (reg & 0x7f) << 16 | val;
609
610 do {
611 if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) {
612 ac97c_writel(chip, COTHR, word);
613 return;
614 }
615 udelay(usec: 1);
616 } while (--timeout);
617
618 dev_dbg(&chip->pdev->dev, "codec write timeout\n");
619}
620
621static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97,
622 unsigned short reg)
623{
624 struct atmel_ac97c *chip = get_chip(ac97);
625 unsigned long word;
626 int timeout = 40;
627 int write = 10;
628
629 word = (0x80 | (reg & 0x7f)) << 16;
630
631 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0)
632 ac97c_readl(chip, CORHR);
633
634retry_write:
635 timeout = 40;
636
637 do {
638 if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) {
639 ac97c_writel(chip, COTHR, word);
640 goto read_reg;
641 }
642 udelay(usec: 10);
643 } while (--timeout);
644
645 if (!--write)
646 goto timed_out;
647 goto retry_write;
648
649read_reg:
650 do {
651 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) {
652 unsigned short val = ac97c_readl(chip, CORHR);
653 return val;
654 }
655 udelay(usec: 10);
656 } while (--timeout);
657
658 if (!--write)
659 goto timed_out;
660 goto retry_write;
661
662timed_out:
663 dev_dbg(&chip->pdev->dev, "codec read timeout\n");
664 return 0xffff;
665}
666
667static void atmel_ac97c_reset(struct atmel_ac97c *chip)
668{
669 ac97c_writel(chip, MR, 0);
670 ac97c_writel(chip, MR, AC97C_MR_ENA);
671 ac97c_writel(chip, CAMR, 0);
672 ac97c_writel(chip, COMR, 0);
673
674 if (!IS_ERR(ptr: chip->reset_pin)) {
675 gpiod_set_value(desc: chip->reset_pin, value: 0);
676 /* AC97 v2.2 specifications says minimum 1 us. */
677 udelay(usec: 2);
678 gpiod_set_value(desc: chip->reset_pin, value: 1);
679 } else {
680 ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA);
681 udelay(usec: 2);
682 ac97c_writel(chip, MR, AC97C_MR_ENA);
683 }
684}
685
686static const struct of_device_id atmel_ac97c_dt_ids[] = {
687 { .compatible = "atmel,at91sam9263-ac97c", },
688 { }
689};
690MODULE_DEVICE_TABLE(of, atmel_ac97c_dt_ids);
691
692static int atmel_ac97c_probe(struct platform_device *pdev)
693{
694 struct device *dev = &pdev->dev;
695 struct snd_card *card;
696 struct atmel_ac97c *chip;
697 struct resource *regs;
698 struct clk *pclk;
699 static const struct snd_ac97_bus_ops ops = {
700 .write = atmel_ac97c_write,
701 .read = atmel_ac97c_read,
702 };
703 int retval;
704 int irq;
705
706 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
707 if (!regs) {
708 dev_dbg(&pdev->dev, "no memory resource\n");
709 return -ENXIO;
710 }
711
712 irq = platform_get_irq(pdev, 0);
713 if (irq < 0) {
714 dev_dbg(&pdev->dev, "could not get irq: %d\n", irq);
715 return irq;
716 }
717
718 pclk = clk_get(dev: &pdev->dev, id: "ac97_clk");
719 if (IS_ERR(ptr: pclk)) {
720 dev_dbg(&pdev->dev, "no peripheral clock\n");
721 return PTR_ERR(ptr: pclk);
722 }
723 retval = clk_prepare_enable(clk: pclk);
724 if (retval)
725 goto err_prepare_enable;
726
727 retval = snd_card_new(parent: &pdev->dev, SNDRV_DEFAULT_IDX1,
728 SNDRV_DEFAULT_STR1, THIS_MODULE,
729 extra_size: sizeof(struct atmel_ac97c), card_ret: &card);
730 if (retval) {
731 dev_dbg(&pdev->dev, "could not create sound card device\n");
732 goto err_snd_card_new;
733 }
734
735 chip = get_chip(card);
736
737 retval = request_irq(irq, handler: atmel_ac97c_interrupt, flags: 0, name: "AC97C", dev: chip);
738 if (retval) {
739 dev_dbg(&pdev->dev, "unable to request irq %d\n", irq);
740 goto err_request_irq;
741 }
742 chip->irq = irq;
743
744 spin_lock_init(&chip->lock);
745
746 strscpy(card->driver, "Atmel AC97C");
747 strscpy(card->shortname, "Atmel AC97C");
748 strscpy(card->longname, "Atmel AC97 controller");
749
750 chip->card = card;
751 chip->pclk = pclk;
752 chip->pdev = pdev;
753 chip->regs = ioremap(offset: regs->start, size: resource_size(res: regs));
754
755 if (!chip->regs) {
756 dev_dbg(&pdev->dev, "could not remap register memory\n");
757 retval = -ENOMEM;
758 goto err_ioremap;
759 }
760
761 chip->reset_pin = devm_gpiod_get_index(dev, con_id: "ac97", idx: 2, flags: GPIOD_OUT_HIGH);
762 if (IS_ERR(ptr: chip->reset_pin))
763 dev_dbg(dev, "reset pin not available\n");
764
765 atmel_ac97c_reset(chip);
766
767 /* Enable overrun interrupt from codec channel */
768 ac97c_writel(chip, COMR, AC97C_CSR_OVRUN);
769 ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT);
770
771 retval = snd_ac97_bus(card, num: 0, ops: &ops, private_data: chip, rbus: &chip->ac97_bus);
772 if (retval) {
773 dev_dbg(&pdev->dev, "could not register on ac97 bus\n");
774 goto err_ac97_bus;
775 }
776
777 retval = atmel_ac97c_mixer_new(chip);
778 if (retval) {
779 dev_dbg(&pdev->dev, "could not register ac97 mixer\n");
780 goto err_ac97_bus;
781 }
782
783 retval = atmel_ac97c_pcm_new(chip);
784 if (retval) {
785 dev_dbg(&pdev->dev, "could not register ac97 pcm device\n");
786 goto err_ac97_bus;
787 }
788
789 retval = snd_card_register(card);
790 if (retval) {
791 dev_dbg(&pdev->dev, "could not register sound card\n");
792 goto err_ac97_bus;
793 }
794
795 platform_set_drvdata(pdev, data: card);
796
797 dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n",
798 chip->regs, irq);
799
800 return 0;
801
802err_ac97_bus:
803 iounmap(addr: chip->regs);
804err_ioremap:
805 free_irq(irq, chip);
806err_request_irq:
807 snd_card_free(card);
808err_snd_card_new:
809 clk_disable_unprepare(clk: pclk);
810err_prepare_enable:
811 clk_put(clk: pclk);
812 return retval;
813}
814
815static int atmel_ac97c_suspend(struct device *pdev)
816{
817 struct snd_card *card = dev_get_drvdata(dev: pdev);
818 struct atmel_ac97c *chip = card->private_data;
819
820 clk_disable_unprepare(clk: chip->pclk);
821 return 0;
822}
823
824static int atmel_ac97c_resume(struct device *pdev)
825{
826 struct snd_card *card = dev_get_drvdata(dev: pdev);
827 struct atmel_ac97c *chip = card->private_data;
828 int ret = clk_prepare_enable(clk: chip->pclk);
829
830 return ret;
831}
832
833static DEFINE_SIMPLE_DEV_PM_OPS(atmel_ac97c_pm, atmel_ac97c_suspend, atmel_ac97c_resume);
834
835static void atmel_ac97c_remove(struct platform_device *pdev)
836{
837 struct snd_card *card = platform_get_drvdata(pdev);
838 struct atmel_ac97c *chip = get_chip(card);
839
840 ac97c_writel(chip, CAMR, 0);
841 ac97c_writel(chip, COMR, 0);
842 ac97c_writel(chip, MR, 0);
843
844 clk_disable_unprepare(clk: chip->pclk);
845 clk_put(clk: chip->pclk);
846 iounmap(addr: chip->regs);
847 free_irq(chip->irq, chip);
848
849 snd_card_free(card);
850}
851
852static struct platform_driver atmel_ac97c_driver = {
853 .probe = atmel_ac97c_probe,
854 .remove = atmel_ac97c_remove,
855 .driver = {
856 .name = "atmel_ac97c",
857 .pm = pm_ptr(&atmel_ac97c_pm),
858 .of_match_table = atmel_ac97c_dt_ids,
859 },
860};
861module_platform_driver(atmel_ac97c_driver);
862
863MODULE_LICENSE("GPL");
864MODULE_DESCRIPTION("Driver for Atmel AC97 controller");
865MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");
866

source code of linux/sound/atmel/ac97c.c