2 * Driver for Atmel AC97C
4 * Copyright (C) 2005-2009 Atmel Corporation
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
10 #include <linux/clk.h>
11 #include <linux/delay.h>
12 #include <linux/bitmap.h>
13 #include <linux/device.h>
14 #include <linux/atmel_pdc.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/module.h>
18 #include <linux/platform_device.h>
19 #include <linux/mutex.h>
20 #include <linux/gpio.h>
21 #include <linux/types.h>
24 #include <linux/of_gpio.h>
25 #include <linux/of_device.h>
27 #include <sound/core.h>
28 #include <sound/initval.h>
29 #include <sound/pcm.h>
30 #include <sound/pcm_params.h>
31 #include <sound/ac97_codec.h>
32 #include <sound/atmel-ac97c.h>
33 #include <sound/memalloc.h>
37 /* Serialize access to opened variable */
38 static DEFINE_MUTEX(opened_mutex
);
42 struct platform_device
*pdev
;
44 struct snd_pcm_substream
*playback_substream
;
45 struct snd_pcm_substream
*capture_substream
;
46 struct snd_card
*card
;
48 struct snd_ac97
*ac97
;
49 struct snd_ac97_bus
*ac97_bus
;
52 unsigned int cur_rate
;
53 int playback_period
, capture_period
;
54 /* Serialize access to opened variable */
62 #define get_chip(card) ((struct atmel_ac97c *)(card)->private_data)
64 #define ac97c_writel(chip, reg, val) \
65 __raw_writel((val), (chip)->regs + AC97C_##reg)
66 #define ac97c_readl(chip, reg) \
67 __raw_readl((chip)->regs + AC97C_##reg)
69 static struct snd_pcm_hardware atmel_ac97c_hw
= {
70 .info
= (SNDRV_PCM_INFO_MMAP
71 | SNDRV_PCM_INFO_MMAP_VALID
72 | SNDRV_PCM_INFO_INTERLEAVED
73 | SNDRV_PCM_INFO_BLOCK_TRANSFER
74 | SNDRV_PCM_INFO_JOINT_DUPLEX
75 | SNDRV_PCM_INFO_RESUME
76 | SNDRV_PCM_INFO_PAUSE
),
77 .formats
= (SNDRV_PCM_FMTBIT_S16_BE
78 | SNDRV_PCM_FMTBIT_S16_LE
),
79 .rates
= (SNDRV_PCM_RATE_CONTINUOUS
),
84 .buffer_bytes_max
= 2 * 2 * 64 * 2048,
85 .period_bytes_min
= 4096,
86 .period_bytes_max
= 4096,
91 static int atmel_ac97c_playback_open(struct snd_pcm_substream
*substream
)
93 struct atmel_ac97c
*chip
= snd_pcm_substream_chip(substream
);
94 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
96 mutex_lock(&opened_mutex
);
98 runtime
->hw
= atmel_ac97c_hw
;
100 runtime
->hw
.rate_min
= chip
->cur_rate
;
101 runtime
->hw
.rate_max
= chip
->cur_rate
;
103 if (chip
->cur_format
)
104 runtime
->hw
.formats
= pcm_format_to_bits(chip
->cur_format
);
105 mutex_unlock(&opened_mutex
);
106 chip
->playback_substream
= substream
;
110 static int atmel_ac97c_capture_open(struct snd_pcm_substream
*substream
)
112 struct atmel_ac97c
*chip
= snd_pcm_substream_chip(substream
);
113 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
115 mutex_lock(&opened_mutex
);
117 runtime
->hw
= atmel_ac97c_hw
;
118 if (chip
->cur_rate
) {
119 runtime
->hw
.rate_min
= chip
->cur_rate
;
120 runtime
->hw
.rate_max
= chip
->cur_rate
;
122 if (chip
->cur_format
)
123 runtime
->hw
.formats
= pcm_format_to_bits(chip
->cur_format
);
124 mutex_unlock(&opened_mutex
);
125 chip
->capture_substream
= substream
;
129 static int atmel_ac97c_playback_close(struct snd_pcm_substream
*substream
)
131 struct atmel_ac97c
*chip
= snd_pcm_substream_chip(substream
);
133 mutex_lock(&opened_mutex
);
137 chip
->cur_format
= 0;
139 mutex_unlock(&opened_mutex
);
141 chip
->playback_substream
= NULL
;
146 static int atmel_ac97c_capture_close(struct snd_pcm_substream
*substream
)
148 struct atmel_ac97c
*chip
= snd_pcm_substream_chip(substream
);
150 mutex_lock(&opened_mutex
);
154 chip
->cur_format
= 0;
156 mutex_unlock(&opened_mutex
);
158 chip
->capture_substream
= NULL
;
163 static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream
*substream
,
164 struct snd_pcm_hw_params
*hw_params
)
166 struct atmel_ac97c
*chip
= snd_pcm_substream_chip(substream
);
169 retval
= snd_pcm_lib_malloc_pages(substream
,
170 params_buffer_bytes(hw_params
));
174 /* Set restrictions to params. */
175 mutex_lock(&opened_mutex
);
176 chip
->cur_rate
= params_rate(hw_params
);
177 chip
->cur_format
= params_format(hw_params
);
178 mutex_unlock(&opened_mutex
);
183 static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream
*substream
,
184 struct snd_pcm_hw_params
*hw_params
)
186 struct atmel_ac97c
*chip
= snd_pcm_substream_chip(substream
);
189 retval
= snd_pcm_lib_malloc_pages(substream
,
190 params_buffer_bytes(hw_params
));
194 /* Set restrictions to params. */
195 mutex_lock(&opened_mutex
);
196 chip
->cur_rate
= params_rate(hw_params
);
197 chip
->cur_format
= params_format(hw_params
);
198 mutex_unlock(&opened_mutex
);
203 static int atmel_ac97c_playback_prepare(struct snd_pcm_substream
*substream
)
205 struct atmel_ac97c
*chip
= snd_pcm_substream_chip(substream
);
206 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
207 int block_size
= frames_to_bytes(runtime
, runtime
->period_size
);
208 unsigned long word
= ac97c_readl(chip
, OCA
);
211 chip
->playback_period
= 0;
212 word
&= ~(AC97C_CH_MASK(PCM_LEFT
) | AC97C_CH_MASK(PCM_RIGHT
));
214 /* assign channels to AC97C channel A */
215 switch (runtime
->channels
) {
217 word
|= AC97C_CH_ASSIGN(PCM_LEFT
, A
);
220 word
|= AC97C_CH_ASSIGN(PCM_LEFT
, A
)
221 | AC97C_CH_ASSIGN(PCM_RIGHT
, A
);
224 /* TODO: support more than two channels */
227 ac97c_writel(chip
, OCA
, word
);
229 /* configure sample format and size */
230 word
= ac97c_readl(chip
, CAMR
);
231 if (chip
->opened
<= 1)
232 word
= AC97C_CMR_DMAEN
| AC97C_CMR_SIZE_16
;
234 word
|= AC97C_CMR_DMAEN
| AC97C_CMR_SIZE_16
;
236 switch (runtime
->format
) {
237 case SNDRV_PCM_FORMAT_S16_LE
:
239 case SNDRV_PCM_FORMAT_S16_BE
: /* fall through */
240 word
&= ~(AC97C_CMR_CEM_LITTLE
);
243 word
= ac97c_readl(chip
, OCA
);
244 word
&= ~(AC97C_CH_MASK(PCM_LEFT
) | AC97C_CH_MASK(PCM_RIGHT
));
245 ac97c_writel(chip
, OCA
, word
);
249 /* Enable underrun interrupt on channel A */
250 word
|= AC97C_CSR_UNRUN
;
252 ac97c_writel(chip
, CAMR
, word
);
254 /* Enable channel A event interrupt */
255 word
= ac97c_readl(chip
, IMR
);
256 word
|= AC97C_SR_CAEVT
;
257 ac97c_writel(chip
, IER
, word
);
259 /* set variable rate if needed */
260 if (runtime
->rate
!= 48000) {
261 word
= ac97c_readl(chip
, MR
);
262 word
|= AC97C_MR_VRA
;
263 ac97c_writel(chip
, MR
, word
);
265 word
= ac97c_readl(chip
, MR
);
266 word
&= ~(AC97C_MR_VRA
);
267 ac97c_writel(chip
, MR
, word
);
270 retval
= snd_ac97_set_rate(chip
->ac97
, AC97_PCM_FRONT_DAC_RATE
,
273 dev_dbg(&chip
->pdev
->dev
, "could not set rate %d Hz\n",
276 /* Initialize and start the PDC */
277 writel(runtime
->dma_addr
, chip
->regs
+ ATMEL_PDC_TPR
);
278 writel(block_size
/ 2, chip
->regs
+ ATMEL_PDC_TCR
);
279 writel(runtime
->dma_addr
+ block_size
, chip
->regs
+ ATMEL_PDC_TNPR
);
280 writel(block_size
/ 2, chip
->regs
+ ATMEL_PDC_TNCR
);
285 static int atmel_ac97c_capture_prepare(struct snd_pcm_substream
*substream
)
287 struct atmel_ac97c
*chip
= snd_pcm_substream_chip(substream
);
288 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
289 int block_size
= frames_to_bytes(runtime
, runtime
->period_size
);
290 unsigned long word
= ac97c_readl(chip
, ICA
);
293 chip
->capture_period
= 0;
294 word
&= ~(AC97C_CH_MASK(PCM_LEFT
) | AC97C_CH_MASK(PCM_RIGHT
));
296 /* assign channels to AC97C channel A */
297 switch (runtime
->channels
) {
299 word
|= AC97C_CH_ASSIGN(PCM_LEFT
, A
);
302 word
|= AC97C_CH_ASSIGN(PCM_LEFT
, A
)
303 | AC97C_CH_ASSIGN(PCM_RIGHT
, A
);
306 /* TODO: support more than two channels */
309 ac97c_writel(chip
, ICA
, word
);
311 /* configure sample format and size */
312 word
= ac97c_readl(chip
, CAMR
);
313 if (chip
->opened
<= 1)
314 word
= AC97C_CMR_DMAEN
| AC97C_CMR_SIZE_16
;
316 word
|= AC97C_CMR_DMAEN
| AC97C_CMR_SIZE_16
;
318 switch (runtime
->format
) {
319 case SNDRV_PCM_FORMAT_S16_LE
:
321 case SNDRV_PCM_FORMAT_S16_BE
: /* fall through */
322 word
&= ~(AC97C_CMR_CEM_LITTLE
);
325 word
= ac97c_readl(chip
, ICA
);
326 word
&= ~(AC97C_CH_MASK(PCM_LEFT
) | AC97C_CH_MASK(PCM_RIGHT
));
327 ac97c_writel(chip
, ICA
, word
);
331 /* Enable overrun interrupt on channel A */
332 word
|= AC97C_CSR_OVRUN
;
334 ac97c_writel(chip
, CAMR
, word
);
336 /* Enable channel A event interrupt */
337 word
= ac97c_readl(chip
, IMR
);
338 word
|= AC97C_SR_CAEVT
;
339 ac97c_writel(chip
, IER
, word
);
341 /* set variable rate if needed */
342 if (runtime
->rate
!= 48000) {
343 word
= ac97c_readl(chip
, MR
);
344 word
|= AC97C_MR_VRA
;
345 ac97c_writel(chip
, MR
, word
);
347 word
= ac97c_readl(chip
, MR
);
348 word
&= ~(AC97C_MR_VRA
);
349 ac97c_writel(chip
, MR
, word
);
352 retval
= snd_ac97_set_rate(chip
->ac97
, AC97_PCM_LR_ADC_RATE
,
355 dev_dbg(&chip
->pdev
->dev
, "could not set rate %d Hz\n",
358 /* Initialize and start the PDC */
359 writel(runtime
->dma_addr
, chip
->regs
+ ATMEL_PDC_RPR
);
360 writel(block_size
/ 2, chip
->regs
+ ATMEL_PDC_RCR
);
361 writel(runtime
->dma_addr
+ block_size
, chip
->regs
+ ATMEL_PDC_RNPR
);
362 writel(block_size
/ 2, chip
->regs
+ ATMEL_PDC_RNCR
);
368 atmel_ac97c_playback_trigger(struct snd_pcm_substream
*substream
, int cmd
)
370 struct atmel_ac97c
*chip
= snd_pcm_substream_chip(substream
);
371 unsigned long camr
, ptcr
= 0;
373 camr
= ac97c_readl(chip
, CAMR
);
376 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE
: /* fall through */
377 case SNDRV_PCM_TRIGGER_RESUME
: /* fall through */
378 case SNDRV_PCM_TRIGGER_START
:
379 ptcr
= ATMEL_PDC_TXTEN
;
380 camr
|= AC97C_CMR_CENA
| AC97C_CSR_ENDTX
;
382 case SNDRV_PCM_TRIGGER_PAUSE_PUSH
: /* fall through */
383 case SNDRV_PCM_TRIGGER_SUSPEND
: /* fall through */
384 case SNDRV_PCM_TRIGGER_STOP
:
385 ptcr
|= ATMEL_PDC_TXTDIS
;
386 if (chip
->opened
<= 1)
387 camr
&= ~AC97C_CMR_CENA
;
393 ac97c_writel(chip
, CAMR
, camr
);
394 writel(ptcr
, chip
->regs
+ ATMEL_PDC_PTCR
);
399 atmel_ac97c_capture_trigger(struct snd_pcm_substream
*substream
, int cmd
)
401 struct atmel_ac97c
*chip
= snd_pcm_substream_chip(substream
);
402 unsigned long camr
, ptcr
= 0;
404 camr
= ac97c_readl(chip
, CAMR
);
405 ptcr
= readl(chip
->regs
+ ATMEL_PDC_PTSR
);
408 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE
: /* fall through */
409 case SNDRV_PCM_TRIGGER_RESUME
: /* fall through */
410 case SNDRV_PCM_TRIGGER_START
:
411 ptcr
= ATMEL_PDC_RXTEN
;
412 camr
|= AC97C_CMR_CENA
| AC97C_CSR_ENDRX
;
414 case SNDRV_PCM_TRIGGER_PAUSE_PUSH
: /* fall through */
415 case SNDRV_PCM_TRIGGER_SUSPEND
: /* fall through */
416 case SNDRV_PCM_TRIGGER_STOP
:
417 ptcr
|= ATMEL_PDC_RXTDIS
;
418 if (chip
->opened
<= 1)
419 camr
&= ~AC97C_CMR_CENA
;
425 ac97c_writel(chip
, CAMR
, camr
);
426 writel(ptcr
, chip
->regs
+ ATMEL_PDC_PTCR
);
430 static snd_pcm_uframes_t
431 atmel_ac97c_playback_pointer(struct snd_pcm_substream
*substream
)
433 struct atmel_ac97c
*chip
= snd_pcm_substream_chip(substream
);
434 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
435 snd_pcm_uframes_t frames
;
438 bytes
= readl(chip
->regs
+ ATMEL_PDC_TPR
);
439 bytes
-= runtime
->dma_addr
;
441 frames
= bytes_to_frames(runtime
, bytes
);
442 if (frames
>= runtime
->buffer_size
)
443 frames
-= runtime
->buffer_size
;
447 static snd_pcm_uframes_t
448 atmel_ac97c_capture_pointer(struct snd_pcm_substream
*substream
)
450 struct atmel_ac97c
*chip
= snd_pcm_substream_chip(substream
);
451 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
452 snd_pcm_uframes_t frames
;
455 bytes
= readl(chip
->regs
+ ATMEL_PDC_RPR
);
456 bytes
-= runtime
->dma_addr
;
458 frames
= bytes_to_frames(runtime
, bytes
);
459 if (frames
>= runtime
->buffer_size
)
460 frames
-= runtime
->buffer_size
;
464 static struct snd_pcm_ops atmel_ac97_playback_ops
= {
465 .open
= atmel_ac97c_playback_open
,
466 .close
= atmel_ac97c_playback_close
,
467 .ioctl
= snd_pcm_lib_ioctl
,
468 .hw_params
= atmel_ac97c_playback_hw_params
,
469 .hw_free
= snd_pcm_lib_free_pages
,
470 .prepare
= atmel_ac97c_playback_prepare
,
471 .trigger
= atmel_ac97c_playback_trigger
,
472 .pointer
= atmel_ac97c_playback_pointer
,
475 static struct snd_pcm_ops atmel_ac97_capture_ops
= {
476 .open
= atmel_ac97c_capture_open
,
477 .close
= atmel_ac97c_capture_close
,
478 .ioctl
= snd_pcm_lib_ioctl
,
479 .hw_params
= atmel_ac97c_capture_hw_params
,
480 .hw_free
= snd_pcm_lib_free_pages
,
481 .prepare
= atmel_ac97c_capture_prepare
,
482 .trigger
= atmel_ac97c_capture_trigger
,
483 .pointer
= atmel_ac97c_capture_pointer
,
486 static irqreturn_t
atmel_ac97c_interrupt(int irq
, void *dev
)
488 struct atmel_ac97c
*chip
= (struct atmel_ac97c
*)dev
;
489 irqreturn_t retval
= IRQ_NONE
;
490 u32 sr
= ac97c_readl(chip
, SR
);
491 u32 casr
= ac97c_readl(chip
, CASR
);
492 u32 cosr
= ac97c_readl(chip
, COSR
);
493 u32 camr
= ac97c_readl(chip
, CAMR
);
495 if (sr
& AC97C_SR_CAEVT
) {
496 struct snd_pcm_runtime
*runtime
;
497 int offset
, next_period
, block_size
;
498 dev_dbg(&chip
->pdev
->dev
, "channel A event%s%s%s%s%s%s\n",
499 casr
& AC97C_CSR_OVRUN
? " OVRUN" : "",
500 casr
& AC97C_CSR_RXRDY
? " RXRDY" : "",
501 casr
& AC97C_CSR_UNRUN
? " UNRUN" : "",
502 casr
& AC97C_CSR_TXEMPTY
? " TXEMPTY" : "",
503 casr
& AC97C_CSR_TXRDY
? " TXRDY" : "",
504 !casr
? " NONE" : "");
505 if ((casr
& camr
) & AC97C_CSR_ENDTX
) {
506 runtime
= chip
->playback_substream
->runtime
;
507 block_size
= frames_to_bytes(runtime
, runtime
->period_size
);
508 chip
->playback_period
++;
510 if (chip
->playback_period
== runtime
->periods
)
511 chip
->playback_period
= 0;
512 next_period
= chip
->playback_period
+ 1;
513 if (next_period
== runtime
->periods
)
516 offset
= block_size
* next_period
;
518 writel(runtime
->dma_addr
+ offset
, chip
->regs
+ ATMEL_PDC_TNPR
);
519 writel(block_size
/ 2, chip
->regs
+ ATMEL_PDC_TNCR
);
521 snd_pcm_period_elapsed(chip
->playback_substream
);
523 if ((casr
& camr
) & AC97C_CSR_ENDRX
) {
524 runtime
= chip
->capture_substream
->runtime
;
525 block_size
= frames_to_bytes(runtime
, runtime
->period_size
);
526 chip
->capture_period
++;
528 if (chip
->capture_period
== runtime
->periods
)
529 chip
->capture_period
= 0;
530 next_period
= chip
->capture_period
+ 1;
531 if (next_period
== runtime
->periods
)
534 offset
= block_size
* next_period
;
536 writel(runtime
->dma_addr
+ offset
, chip
->regs
+ ATMEL_PDC_RNPR
);
537 writel(block_size
/ 2, chip
->regs
+ ATMEL_PDC_RNCR
);
538 snd_pcm_period_elapsed(chip
->capture_substream
);
540 retval
= IRQ_HANDLED
;
543 if (sr
& AC97C_SR_COEVT
) {
544 dev_info(&chip
->pdev
->dev
, "codec channel event%s%s%s%s%s\n",
545 cosr
& AC97C_CSR_OVRUN
? " OVRUN" : "",
546 cosr
& AC97C_CSR_RXRDY
? " RXRDY" : "",
547 cosr
& AC97C_CSR_TXEMPTY
? " TXEMPTY" : "",
548 cosr
& AC97C_CSR_TXRDY
? " TXRDY" : "",
549 !cosr
? " NONE" : "");
550 retval
= IRQ_HANDLED
;
553 if (retval
== IRQ_NONE
) {
554 dev_err(&chip
->pdev
->dev
, "spurious interrupt sr 0x%08x "
555 "casr 0x%08x cosr 0x%08x\n", sr
, casr
, cosr
);
561 static struct ac97_pcm at91_ac97_pcm_defs
[] = {
566 .slots
= ((1 << AC97_SLOT_PCM_LEFT
)
567 | (1 << AC97_SLOT_PCM_RIGHT
)),
575 .slots
= ((1 << AC97_SLOT_PCM_LEFT
)
576 | (1 << AC97_SLOT_PCM_RIGHT
)),
584 .slots
= (1<<AC97_SLOT_MIC
),
589 static int atmel_ac97c_pcm_new(struct atmel_ac97c
*chip
)
592 struct snd_pcm_hardware hw
= atmel_ac97c_hw
;
595 retval
= snd_ac97_pcm_assign(chip
->ac97_bus
,
596 ARRAY_SIZE(at91_ac97_pcm_defs
),
601 retval
= snd_pcm_new(chip
->card
, chip
->card
->shortname
, 0, 1, 1, &pcm
);
605 snd_pcm_set_ops(pcm
, SNDRV_PCM_STREAM_CAPTURE
, &atmel_ac97_capture_ops
);
606 snd_pcm_set_ops(pcm
, SNDRV_PCM_STREAM_PLAYBACK
, &atmel_ac97_playback_ops
);
608 retval
= snd_pcm_lib_preallocate_pages_for_all(pcm
, SNDRV_DMA_TYPE_DEV
,
609 &chip
->pdev
->dev
, hw
.periods_min
* hw
.period_bytes_min
,
610 hw
.buffer_bytes_max
);
614 pcm
->private_data
= chip
;
616 strcpy(pcm
->name
, chip
->card
->shortname
);
622 static int atmel_ac97c_mixer_new(struct atmel_ac97c
*chip
)
624 struct snd_ac97_template
template;
625 memset(&template, 0, sizeof(template));
626 template.private_data
= chip
;
627 return snd_ac97_mixer(chip
->ac97_bus
, &template, &chip
->ac97
);
630 static void atmel_ac97c_write(struct snd_ac97
*ac97
, unsigned short reg
,
633 struct atmel_ac97c
*chip
= get_chip(ac97
);
637 word
= (reg
& 0x7f) << 16 | val
;
640 if (ac97c_readl(chip
, COSR
) & AC97C_CSR_TXRDY
) {
641 ac97c_writel(chip
, COTHR
, word
);
647 dev_dbg(&chip
->pdev
->dev
, "codec write timeout\n");
650 static unsigned short atmel_ac97c_read(struct snd_ac97
*ac97
,
653 struct atmel_ac97c
*chip
= get_chip(ac97
);
658 word
= (0x80 | (reg
& 0x7f)) << 16;
660 if ((ac97c_readl(chip
, COSR
) & AC97C_CSR_RXRDY
) != 0)
661 ac97c_readl(chip
, CORHR
);
667 if ((ac97c_readl(chip
, COSR
) & AC97C_CSR_TXRDY
) != 0) {
668 ac97c_writel(chip
, COTHR
, word
);
680 if ((ac97c_readl(chip
, COSR
) & AC97C_CSR_RXRDY
) != 0) {
681 unsigned short val
= ac97c_readl(chip
, CORHR
);
692 dev_dbg(&chip
->pdev
->dev
, "codec read timeout\n");
696 static void atmel_ac97c_reset(struct atmel_ac97c
*chip
)
698 ac97c_writel(chip
, MR
, 0);
699 ac97c_writel(chip
, MR
, AC97C_MR_ENA
);
700 ac97c_writel(chip
, CAMR
, 0);
701 ac97c_writel(chip
, COMR
, 0);
703 if (gpio_is_valid(chip
->reset_pin
)) {
704 gpio_set_value(chip
->reset_pin
, 0);
705 /* AC97 v2.2 specifications says minimum 1 us. */
707 gpio_set_value(chip
->reset_pin
, 1);
709 ac97c_writel(chip
, MR
, AC97C_MR_WRST
| AC97C_MR_ENA
);
711 ac97c_writel(chip
, MR
, AC97C_MR_ENA
);
716 static const struct of_device_id atmel_ac97c_dt_ids
[] = {
717 { .compatible
= "atmel,at91sam9263-ac97c", },
720 MODULE_DEVICE_TABLE(of
, atmel_ac97c_dt_ids
);
722 static struct ac97c_platform_data
*atmel_ac97c_probe_dt(struct device
*dev
)
724 struct ac97c_platform_data
*pdata
;
725 struct device_node
*node
= dev
->of_node
;
728 dev_err(dev
, "Device does not have associated DT data\n");
729 return ERR_PTR(-EINVAL
);
732 pdata
= devm_kzalloc(dev
, sizeof(*pdata
), GFP_KERNEL
);
734 return ERR_PTR(-ENOMEM
);
736 pdata
->reset_pin
= of_get_named_gpio(dev
->of_node
, "ac97-gpios", 2);
741 static struct ac97c_platform_data
*atmel_ac97c_probe_dt(struct device
*dev
)
743 dev_err(dev
, "no platform data defined\n");
744 return ERR_PTR(-ENXIO
);
748 static int atmel_ac97c_probe(struct platform_device
*pdev
)
750 struct snd_card
*card
;
751 struct atmel_ac97c
*chip
;
752 struct resource
*regs
;
753 struct ac97c_platform_data
*pdata
;
755 static struct snd_ac97_bus_ops ops
= {
756 .write
= atmel_ac97c_write
,
757 .read
= atmel_ac97c_read
,
762 regs
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
764 dev_dbg(&pdev
->dev
, "no memory resource\n");
768 pdata
= dev_get_platdata(&pdev
->dev
);
770 pdata
= atmel_ac97c_probe_dt(&pdev
->dev
);
772 return PTR_ERR(pdata
);
775 irq
= platform_get_irq(pdev
, 0);
777 dev_dbg(&pdev
->dev
, "could not get irq: %d\n", irq
);
781 pclk
= clk_get(&pdev
->dev
, "ac97_clk");
783 dev_dbg(&pdev
->dev
, "no peripheral clock\n");
784 return PTR_ERR(pclk
);
786 clk_prepare_enable(pclk
);
788 retval
= snd_card_new(&pdev
->dev
, SNDRV_DEFAULT_IDX1
,
789 SNDRV_DEFAULT_STR1
, THIS_MODULE
,
790 sizeof(struct atmel_ac97c
), &card
);
792 dev_dbg(&pdev
->dev
, "could not create sound card device\n");
793 goto err_snd_card_new
;
796 chip
= get_chip(card
);
798 retval
= request_irq(irq
, atmel_ac97c_interrupt
, 0, "AC97C", chip
);
800 dev_dbg(&pdev
->dev
, "unable to request irq %d\n", irq
);
801 goto err_request_irq
;
805 spin_lock_init(&chip
->lock
);
807 strcpy(card
->driver
, "Atmel AC97C");
808 strcpy(card
->shortname
, "Atmel AC97C");
809 sprintf(card
->longname
, "Atmel AC97 controller");
814 chip
->regs
= ioremap(regs
->start
, resource_size(regs
));
817 dev_dbg(&pdev
->dev
, "could not remap register memory\n");
822 if (gpio_is_valid(pdata
->reset_pin
)) {
823 if (gpio_request(pdata
->reset_pin
, "reset_pin")) {
824 dev_dbg(&pdev
->dev
, "reset pin not available\n");
825 chip
->reset_pin
= -ENODEV
;
827 gpio_direction_output(pdata
->reset_pin
, 1);
828 chip
->reset_pin
= pdata
->reset_pin
;
831 chip
->reset_pin
= -EINVAL
;
834 atmel_ac97c_reset(chip
);
836 /* Enable overrun interrupt from codec channel */
837 ac97c_writel(chip
, COMR
, AC97C_CSR_OVRUN
);
838 ac97c_writel(chip
, IER
, ac97c_readl(chip
, IMR
) | AC97C_SR_COEVT
);
840 retval
= snd_ac97_bus(card
, 0, &ops
, chip
, &chip
->ac97_bus
);
842 dev_dbg(&pdev
->dev
, "could not register on ac97 bus\n");
846 retval
= atmel_ac97c_mixer_new(chip
);
848 dev_dbg(&pdev
->dev
, "could not register ac97 mixer\n");
852 retval
= atmel_ac97c_pcm_new(chip
);
854 dev_dbg(&pdev
->dev
, "could not register ac97 pcm device\n");
858 retval
= snd_card_register(card
);
860 dev_dbg(&pdev
->dev
, "could not register sound card\n");
864 platform_set_drvdata(pdev
, card
);
866 dev_info(&pdev
->dev
, "Atmel AC97 controller at 0x%p, irq = %d\n",
872 if (gpio_is_valid(chip
->reset_pin
))
873 gpio_free(chip
->reset_pin
);
881 clk_disable_unprepare(pclk
);
886 #ifdef CONFIG_PM_SLEEP
887 static int atmel_ac97c_suspend(struct device
*pdev
)
889 struct snd_card
*card
= dev_get_drvdata(pdev
);
890 struct atmel_ac97c
*chip
= card
->private_data
;
892 clk_disable_unprepare(chip
->pclk
);
896 static int atmel_ac97c_resume(struct device
*pdev
)
898 struct snd_card
*card
= dev_get_drvdata(pdev
);
899 struct atmel_ac97c
*chip
= card
->private_data
;
901 clk_prepare_enable(chip
->pclk
);
905 static SIMPLE_DEV_PM_OPS(atmel_ac97c_pm
, atmel_ac97c_suspend
, atmel_ac97c_resume
);
906 #define ATMEL_AC97C_PM_OPS &atmel_ac97c_pm
908 #define ATMEL_AC97C_PM_OPS NULL
911 static int atmel_ac97c_remove(struct platform_device
*pdev
)
913 struct snd_card
*card
= platform_get_drvdata(pdev
);
914 struct atmel_ac97c
*chip
= get_chip(card
);
916 if (gpio_is_valid(chip
->reset_pin
))
917 gpio_free(chip
->reset_pin
);
919 ac97c_writel(chip
, CAMR
, 0);
920 ac97c_writel(chip
, COMR
, 0);
921 ac97c_writel(chip
, MR
, 0);
923 clk_disable_unprepare(chip
->pclk
);
926 free_irq(chip
->irq
, chip
);
933 static struct platform_driver atmel_ac97c_driver
= {
934 .probe
= atmel_ac97c_probe
,
935 .remove
= atmel_ac97c_remove
,
937 .name
= "atmel_ac97c",
938 .pm
= ATMEL_AC97C_PM_OPS
,
939 .of_match_table
= of_match_ptr(atmel_ac97c_dt_ids
),
942 module_platform_driver(atmel_ac97c_driver
);
944 MODULE_LICENSE("GPL");
945 MODULE_DESCRIPTION("Driver for Atmel AC97 controller");
946 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");