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TOMOYO Linux Cross Reference
Linux/sound/atmel/ac97c.c

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  1 /*
  2  * Driver for Atmel AC97C
  3  *
  4  * Copyright (C) 2005-2009 Atmel Corporation
  5  *
  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.
  9  */
 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>
 22 #include <linux/io.h>
 23 #include <linux/of.h>
 24 #include <linux/of_gpio.h>
 25 #include <linux/of_device.h>
 26 
 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>
 34 
 35 #include "ac97c.h"
 36 
 37 /* Serialize access to opened variable */
 38 static DEFINE_MUTEX(opened_mutex);
 39 
 40 struct atmel_ac97c {
 41         struct clk                      *pclk;
 42         struct platform_device          *pdev;
 43 
 44         struct snd_pcm_substream        *playback_substream;
 45         struct snd_pcm_substream        *capture_substream;
 46         struct snd_card                 *card;
 47         struct snd_pcm                  *pcm;
 48         struct snd_ac97                 *ac97;
 49         struct snd_ac97_bus             *ac97_bus;
 50 
 51         u64                             cur_format;
 52         unsigned int                    cur_rate;
 53         int                             playback_period, capture_period;
 54         /* Serialize access to opened variable */
 55         spinlock_t                      lock;
 56         void __iomem                    *regs;
 57         int                             irq;
 58         int                             opened;
 59         int                             reset_pin;
 60 };
 61 
 62 #define get_chip(card) ((struct atmel_ac97c *)(card)->private_data)
 63 
 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)
 68 
 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),
 80         .rate_min               = 4000,
 81         .rate_max               = 48000,
 82         .channels_min           = 1,
 83         .channels_max           = 2,
 84         .buffer_bytes_max       = 2 * 2 * 64 * 2048,
 85         .period_bytes_min       = 4096,
 86         .period_bytes_max       = 4096,
 87         .periods_min            = 6,
 88         .periods_max            = 64,
 89 };
 90 
 91 static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream)
 92 {
 93         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 94         struct snd_pcm_runtime *runtime = substream->runtime;
 95 
 96         mutex_lock(&opened_mutex);
 97         chip->opened++;
 98         runtime->hw = atmel_ac97c_hw;
 99         if (chip->cur_rate) {
100                 runtime->hw.rate_min = chip->cur_rate;
101                 runtime->hw.rate_max = chip->cur_rate;
102         }
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;
107         return 0;
108 }
109 
110 static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream)
111 {
112         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
113         struct snd_pcm_runtime *runtime = substream->runtime;
114 
115         mutex_lock(&opened_mutex);
116         chip->opened++;
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;
121         }
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;
126         return 0;
127 }
128 
129 static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream)
130 {
131         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
132 
133         mutex_lock(&opened_mutex);
134         chip->opened--;
135         if (!chip->opened) {
136                 chip->cur_rate = 0;
137                 chip->cur_format = 0;
138         }
139         mutex_unlock(&opened_mutex);
140 
141         chip->playback_substream = NULL;
142 
143         return 0;
144 }
145 
146 static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream)
147 {
148         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
149 
150         mutex_lock(&opened_mutex);
151         chip->opened--;
152         if (!chip->opened) {
153                 chip->cur_rate = 0;
154                 chip->cur_format = 0;
155         }
156         mutex_unlock(&opened_mutex);
157 
158         chip->capture_substream = NULL;
159 
160         return 0;
161 }
162 
163 static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream,
164                 struct snd_pcm_hw_params *hw_params)
165 {
166         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
167         int retval;
168 
169         retval = snd_pcm_lib_malloc_pages(substream,
170                                         params_buffer_bytes(hw_params));
171         if (retval < 0)
172                 return retval;
173 
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);
179 
180         return retval;
181 }
182 
183 static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream,
184                 struct snd_pcm_hw_params *hw_params)
185 {
186         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
187         int retval;
188 
189         retval = snd_pcm_lib_malloc_pages(substream,
190                                         params_buffer_bytes(hw_params));
191         if (retval < 0)
192                 return retval;
193 
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);
199 
200         return retval;
201 }
202 
203 static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
204 {
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);
209         int retval;
210 
211         chip->playback_period = 0;
212         word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
213 
214         /* assign channels to AC97C channel A */
215         switch (runtime->channels) {
216         case 1:
217                 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
218                 break;
219         case 2:
220                 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
221                         | AC97C_CH_ASSIGN(PCM_RIGHT, A);
222                 break;
223         default:
224                 /* TODO: support more than two channels */
225                 return -EINVAL;
226         }
227         ac97c_writel(chip, OCA, word);
228 
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;
233         else
234                 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
235 
236         switch (runtime->format) {
237         case SNDRV_PCM_FORMAT_S16_LE:
238                 break;
239         case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
240                 word &= ~(AC97C_CMR_CEM_LITTLE);
241                 break;
242         default:
243                 word = ac97c_readl(chip, OCA);
244                 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
245                 ac97c_writel(chip, OCA, word);
246                 return -EINVAL;
247         }
248 
249         /* Enable underrun interrupt on channel A */
250         word |= AC97C_CSR_UNRUN;
251 
252         ac97c_writel(chip, CAMR, word);
253 
254         /* Enable channel A event interrupt */
255         word = ac97c_readl(chip, IMR);
256         word |= AC97C_SR_CAEVT;
257         ac97c_writel(chip, IER, word);
258 
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);
264         } else {
265                 word = ac97c_readl(chip, MR);
266                 word &= ~(AC97C_MR_VRA);
267                 ac97c_writel(chip, MR, word);
268         }
269 
270         retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE,
271                         runtime->rate);
272         if (retval)
273                 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
274                                 runtime->rate);
275 
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);
281 
282         return retval;
283 }
284 
285 static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
286 {
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);
291         int retval;
292 
293         chip->capture_period = 0;
294         word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
295 
296         /* assign channels to AC97C channel A */
297         switch (runtime->channels) {
298         case 1:
299                 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
300                 break;
301         case 2:
302                 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
303                         | AC97C_CH_ASSIGN(PCM_RIGHT, A);
304                 break;
305         default:
306                 /* TODO: support more than two channels */
307                 return -EINVAL;
308         }
309         ac97c_writel(chip, ICA, word);
310 
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;
315         else
316                 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
317 
318         switch (runtime->format) {
319         case SNDRV_PCM_FORMAT_S16_LE:
320                 break;
321         case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
322                 word &= ~(AC97C_CMR_CEM_LITTLE);
323                 break;
324         default:
325                 word = ac97c_readl(chip, ICA);
326                 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
327                 ac97c_writel(chip, ICA, word);
328                 return -EINVAL;
329         }
330 
331         /* Enable overrun interrupt on channel A */
332         word |= AC97C_CSR_OVRUN;
333 
334         ac97c_writel(chip, CAMR, word);
335 
336         /* Enable channel A event interrupt */
337         word = ac97c_readl(chip, IMR);
338         word |= AC97C_SR_CAEVT;
339         ac97c_writel(chip, IER, word);
340 
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);
346         } else {
347                 word = ac97c_readl(chip, MR);
348                 word &= ~(AC97C_MR_VRA);
349                 ac97c_writel(chip, MR, word);
350         }
351 
352         retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE,
353                         runtime->rate);
354         if (retval)
355                 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
356                                 runtime->rate);
357 
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);
363 
364         return retval;
365 }
366 
367 static int
368 atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
369 {
370         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
371         unsigned long camr, ptcr = 0;
372 
373         camr = ac97c_readl(chip, CAMR);
374 
375         switch (cmd) {
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;
381                 break;
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;
388                 break;
389         default:
390                 return -EINVAL;
391         }
392 
393         ac97c_writel(chip, CAMR, camr);
394         writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
395         return 0;
396 }
397 
398 static int
399 atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
400 {
401         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
402         unsigned long camr, ptcr = 0;
403 
404         camr = ac97c_readl(chip, CAMR);
405         ptcr = readl(chip->regs + ATMEL_PDC_PTSR);
406 
407         switch (cmd) {
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;
413                 break;
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;
420                 break;
421         default:
422                 return -EINVAL;
423         }
424 
425         ac97c_writel(chip, CAMR, camr);
426         writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
427         return 0;
428 }
429 
430 static snd_pcm_uframes_t
431 atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream)
432 {
433         struct atmel_ac97c      *chip = snd_pcm_substream_chip(substream);
434         struct snd_pcm_runtime  *runtime = substream->runtime;
435         snd_pcm_uframes_t       frames;
436         unsigned long           bytes;
437 
438         bytes = readl(chip->regs + ATMEL_PDC_TPR);
439         bytes -= runtime->dma_addr;
440 
441         frames = bytes_to_frames(runtime, bytes);
442         if (frames >= runtime->buffer_size)
443                 frames -= runtime->buffer_size;
444         return frames;
445 }
446 
447 static snd_pcm_uframes_t
448 atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream)
449 {
450         struct atmel_ac97c      *chip = snd_pcm_substream_chip(substream);
451         struct snd_pcm_runtime  *runtime = substream->runtime;
452         snd_pcm_uframes_t       frames;
453         unsigned long           bytes;
454 
455         bytes = readl(chip->regs + ATMEL_PDC_RPR);
456         bytes -= runtime->dma_addr;
457 
458         frames = bytes_to_frames(runtime, bytes);
459         if (frames >= runtime->buffer_size)
460                 frames -= runtime->buffer_size;
461         return frames;
462 }
463 
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,
473 };
474 
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,
484 };
485 
486 static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
487 {
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);
494 
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++;
509 
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)
514                                 next_period = 0;
515 
516                         offset = block_size * next_period;
517 
518                         writel(runtime->dma_addr + offset, chip->regs + ATMEL_PDC_TNPR);
519                         writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR);
520 
521                         snd_pcm_period_elapsed(chip->playback_substream);
522                 }
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++;
527 
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)
532                                 next_period = 0;
533 
534                         offset = block_size * next_period;
535 
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);
539                 }
540                 retval = IRQ_HANDLED;
541         }
542 
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;
551         }
552 
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);
556         }
557 
558         return retval;
559 }
560 
561 static struct ac97_pcm at91_ac97_pcm_defs[] = {
562         /* Playback */
563         {
564                 .exclusive = 1,
565                 .r = { {
566                         .slots = ((1 << AC97_SLOT_PCM_LEFT)
567                                   | (1 << AC97_SLOT_PCM_RIGHT)),
568                 } },
569         },
570         /* PCM in */
571         {
572                 .stream = 1,
573                 .exclusive = 1,
574                 .r = { {
575                         .slots = ((1 << AC97_SLOT_PCM_LEFT)
576                                         | (1 << AC97_SLOT_PCM_RIGHT)),
577                 } }
578         },
579         /* Mic in */
580         {
581                 .stream = 1,
582                 .exclusive = 1,
583                 .r = { {
584                         .slots = (1<<AC97_SLOT_MIC),
585                 } }
586         },
587 };
588 
589 static int atmel_ac97c_pcm_new(struct atmel_ac97c *chip)
590 {
591         struct snd_pcm          *pcm;
592         struct snd_pcm_hardware hw = atmel_ac97c_hw;
593         int                     retval;
594 
595         retval = snd_ac97_pcm_assign(chip->ac97_bus,
596                                      ARRAY_SIZE(at91_ac97_pcm_defs),
597                                      at91_ac97_pcm_defs);
598         if (retval)
599                 return retval;
600 
601         retval = snd_pcm_new(chip->card, chip->card->shortname, 0, 1, 1, &pcm);
602         if (retval)
603                 return retval;
604 
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);
607 
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);
611         if (retval)
612                 return retval;
613 
614         pcm->private_data = chip;
615         pcm->info_flags = 0;
616         strcpy(pcm->name, chip->card->shortname);
617         chip->pcm = pcm;
618 
619         return 0;
620 }
621 
622 static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip)
623 {
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);
628 }
629 
630 static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg,
631                 unsigned short val)
632 {
633         struct atmel_ac97c *chip = get_chip(ac97);
634         unsigned long word;
635         int timeout = 40;
636 
637         word = (reg & 0x7f) << 16 | val;
638 
639         do {
640                 if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) {
641                         ac97c_writel(chip, COTHR, word);
642                         return;
643                 }
644                 udelay(1);
645         } while (--timeout);
646 
647         dev_dbg(&chip->pdev->dev, "codec write timeout\n");
648 }
649 
650 static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97,
651                 unsigned short reg)
652 {
653         struct atmel_ac97c *chip = get_chip(ac97);
654         unsigned long word;
655         int timeout = 40;
656         int write = 10;
657 
658         word = (0x80 | (reg & 0x7f)) << 16;
659 
660         if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0)
661                 ac97c_readl(chip, CORHR);
662 
663 retry_write:
664         timeout = 40;
665 
666         do {
667                 if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) {
668                         ac97c_writel(chip, COTHR, word);
669                         goto read_reg;
670                 }
671                 udelay(10);
672         } while (--timeout);
673 
674         if (!--write)
675                 goto timed_out;
676         goto retry_write;
677 
678 read_reg:
679         do {
680                 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) {
681                         unsigned short val = ac97c_readl(chip, CORHR);
682                         return val;
683                 }
684                 udelay(10);
685         } while (--timeout);
686 
687         if (!--write)
688                 goto timed_out;
689         goto retry_write;
690 
691 timed_out:
692         dev_dbg(&chip->pdev->dev, "codec read timeout\n");
693         return 0xffff;
694 }
695 
696 static void atmel_ac97c_reset(struct atmel_ac97c *chip)
697 {
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);
702 
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. */
706                 udelay(2);
707                 gpio_set_value(chip->reset_pin, 1);
708         } else {
709                 ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA);
710                 udelay(2);
711                 ac97c_writel(chip, MR, AC97C_MR_ENA);
712         }
713 }
714 
715 #ifdef CONFIG_OF
716 static const struct of_device_id atmel_ac97c_dt_ids[] = {
717         { .compatible = "atmel,at91sam9263-ac97c", },
718         { }
719 };
720 MODULE_DEVICE_TABLE(of, atmel_ac97c_dt_ids);
721 
722 static struct ac97c_platform_data *atmel_ac97c_probe_dt(struct device *dev)
723 {
724         struct ac97c_platform_data *pdata;
725         struct device_node *node = dev->of_node;
726 
727         if (!node) {
728                 dev_err(dev, "Device does not have associated DT data\n");
729                 return ERR_PTR(-EINVAL);
730         }
731 
732         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
733         if (!pdata)
734                 return ERR_PTR(-ENOMEM);
735 
736         pdata->reset_pin = of_get_named_gpio(dev->of_node, "ac97-gpios", 2);
737 
738         return pdata;
739 }
740 #else
741 static struct ac97c_platform_data *atmel_ac97c_probe_dt(struct device *dev)
742 {
743         dev_err(dev, "no platform data defined\n");
744         return ERR_PTR(-ENXIO);
745 }
746 #endif
747 
748 static int atmel_ac97c_probe(struct platform_device *pdev)
749 {
750         struct snd_card                 *card;
751         struct atmel_ac97c              *chip;
752         struct resource                 *regs;
753         struct ac97c_platform_data      *pdata;
754         struct clk                      *pclk;
755         static struct snd_ac97_bus_ops  ops = {
756                 .write  = atmel_ac97c_write,
757                 .read   = atmel_ac97c_read,
758         };
759         int                             retval;
760         int                             irq;
761 
762         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
763         if (!regs) {
764                 dev_dbg(&pdev->dev, "no memory resource\n");
765                 return -ENXIO;
766         }
767 
768         pdata = dev_get_platdata(&pdev->dev);
769         if (!pdata) {
770                 pdata = atmel_ac97c_probe_dt(&pdev->dev);
771                 if (IS_ERR(pdata))
772                         return PTR_ERR(pdata);
773         }
774 
775         irq = platform_get_irq(pdev, 0);
776         if (irq < 0) {
777                 dev_dbg(&pdev->dev, "could not get irq: %d\n", irq);
778                 return irq;
779         }
780 
781         pclk = clk_get(&pdev->dev, "ac97_clk");
782         if (IS_ERR(pclk)) {
783                 dev_dbg(&pdev->dev, "no peripheral clock\n");
784                 return PTR_ERR(pclk);
785         }
786         clk_prepare_enable(pclk);
787 
788         retval = snd_card_new(&pdev->dev, SNDRV_DEFAULT_IDX1,
789                               SNDRV_DEFAULT_STR1, THIS_MODULE,
790                               sizeof(struct atmel_ac97c), &card);
791         if (retval) {
792                 dev_dbg(&pdev->dev, "could not create sound card device\n");
793                 goto err_snd_card_new;
794         }
795 
796         chip = get_chip(card);
797 
798         retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip);
799         if (retval) {
800                 dev_dbg(&pdev->dev, "unable to request irq %d\n", irq);
801                 goto err_request_irq;
802         }
803         chip->irq = irq;
804 
805         spin_lock_init(&chip->lock);
806 
807         strcpy(card->driver, "Atmel AC97C");
808         strcpy(card->shortname, "Atmel AC97C");
809         sprintf(card->longname, "Atmel AC97 controller");
810 
811         chip->card = card;
812         chip->pclk = pclk;
813         chip->pdev = pdev;
814         chip->regs = ioremap(regs->start, resource_size(regs));
815 
816         if (!chip->regs) {
817                 dev_dbg(&pdev->dev, "could not remap register memory\n");
818                 retval = -ENOMEM;
819                 goto err_ioremap;
820         }
821 
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;
826                 } else {
827                         gpio_direction_output(pdata->reset_pin, 1);
828                         chip->reset_pin = pdata->reset_pin;
829                 }
830         } else {
831                 chip->reset_pin = -EINVAL;
832         }
833 
834         atmel_ac97c_reset(chip);
835 
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);
839 
840         retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus);
841         if (retval) {
842                 dev_dbg(&pdev->dev, "could not register on ac97 bus\n");
843                 goto err_ac97_bus;
844         }
845 
846         retval = atmel_ac97c_mixer_new(chip);
847         if (retval) {
848                 dev_dbg(&pdev->dev, "could not register ac97 mixer\n");
849                 goto err_ac97_bus;
850         }
851 
852         retval = atmel_ac97c_pcm_new(chip);
853         if (retval) {
854                 dev_dbg(&pdev->dev, "could not register ac97 pcm device\n");
855                 goto err_ac97_bus;
856         }
857 
858         retval = snd_card_register(card);
859         if (retval) {
860                 dev_dbg(&pdev->dev, "could not register sound card\n");
861                 goto err_ac97_bus;
862         }
863 
864         platform_set_drvdata(pdev, card);
865 
866         dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n",
867                         chip->regs, irq);
868 
869         return 0;
870 
871 err_ac97_bus:
872         if (gpio_is_valid(chip->reset_pin))
873                 gpio_free(chip->reset_pin);
874 
875         iounmap(chip->regs);
876 err_ioremap:
877         free_irq(irq, chip);
878 err_request_irq:
879         snd_card_free(card);
880 err_snd_card_new:
881         clk_disable_unprepare(pclk);
882         clk_put(pclk);
883         return retval;
884 }
885 
886 #ifdef CONFIG_PM_SLEEP
887 static int atmel_ac97c_suspend(struct device *pdev)
888 {
889         struct snd_card *card = dev_get_drvdata(pdev);
890         struct atmel_ac97c *chip = card->private_data;
891 
892         clk_disable_unprepare(chip->pclk);
893         return 0;
894 }
895 
896 static int atmel_ac97c_resume(struct device *pdev)
897 {
898         struct snd_card *card = dev_get_drvdata(pdev);
899         struct atmel_ac97c *chip = card->private_data;
900 
901         clk_prepare_enable(chip->pclk);
902         return 0;
903 }
904 
905 static SIMPLE_DEV_PM_OPS(atmel_ac97c_pm, atmel_ac97c_suspend, atmel_ac97c_resume);
906 #define ATMEL_AC97C_PM_OPS      &atmel_ac97c_pm
907 #else
908 #define ATMEL_AC97C_PM_OPS      NULL
909 #endif
910 
911 static int atmel_ac97c_remove(struct platform_device *pdev)
912 {
913         struct snd_card *card = platform_get_drvdata(pdev);
914         struct atmel_ac97c *chip = get_chip(card);
915 
916         if (gpio_is_valid(chip->reset_pin))
917                 gpio_free(chip->reset_pin);
918 
919         ac97c_writel(chip, CAMR, 0);
920         ac97c_writel(chip, COMR, 0);
921         ac97c_writel(chip, MR,   0);
922 
923         clk_disable_unprepare(chip->pclk);
924         clk_put(chip->pclk);
925         iounmap(chip->regs);
926         free_irq(chip->irq, chip);
927 
928         snd_card_free(card);
929 
930         return 0;
931 }
932 
933 static struct platform_driver atmel_ac97c_driver = {
934         .probe          = atmel_ac97c_probe,
935         .remove         = atmel_ac97c_remove,
936         .driver         = {
937                 .name   = "atmel_ac97c",
938                 .pm     = ATMEL_AC97C_PM_OPS,
939                 .of_match_table = of_match_ptr(atmel_ac97c_dt_ids),
940         },
941 };
942 module_platform_driver(atmel_ac97c_driver);
943 
944 MODULE_LICENSE("GPL");
945 MODULE_DESCRIPTION("Driver for Atmel AC97 controller");
946 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");
947 

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