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tty/hvc: remove celleb-only beat driver
[linux/fpc-iii.git] / sound / atmel / ac97c.c
blobcf4cedf2b420f12de4d46cf702fabeab2c136b02
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/dmaengine.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/atmel_pdc.h>
17 #include <linux/init.h>
18 #include <linux/interrupt.h>
19 #include <linux/module.h>
20 #include <linux/platform_device.h>
21 #include <linux/mutex.h>
22 #include <linux/gpio.h>
23 #include <linux/types.h>
24 #include <linux/io.h>
25 #include <linux/of.h>
26 #include <linux/of_gpio.h>
27 #include <linux/of_device.h>
28
29 #include <sound/core.h>
30 #include <sound/initval.h>
31 #include <sound/pcm.h>
32 #include <sound/pcm_params.h>
33 #include <sound/ac97_codec.h>
34 #include <sound/atmel-ac97c.h>
35 #include <sound/memalloc.h>
36
37 #include <linux/platform_data/dma-dw.h>
38 #include <linux/dma/dw.h>
39
40 #ifdef CONFIG_AVR32
41 #include <mach/cpu.h>
42 #else
43 #define cpu_is_at32ap7000() 0
44 #endif
45
46 #include "ac97c.h"
47
48 enum {
49 DMA_TX_READY = 0,
50 DMA_RX_READY,
51 DMA_TX_CHAN_PRESENT,
52 DMA_RX_CHAN_PRESENT,
53 };
54
55 /* Serialize access to opened variable */
56 static DEFINE_MUTEX(opened_mutex);
57
58 struct atmel_ac97c_dma {
59 struct dma_chan *rx_chan;
60 struct dma_chan *tx_chan;
61 };
62
63 struct atmel_ac97c {
64 struct clk *pclk;
65 struct platform_device *pdev;
66 struct atmel_ac97c_dma dma;
67
68 struct snd_pcm_substream *playback_substream;
69 struct snd_pcm_substream *capture_substream;
70 struct snd_card *card;
71 struct snd_pcm *pcm;
72 struct snd_ac97 *ac97;
73 struct snd_ac97_bus *ac97_bus;
74
75 u64 cur_format;
76 unsigned int cur_rate;
77 unsigned long flags;
78 int playback_period, capture_period;
79 /* Serialize access to opened variable */
80 spinlock_t lock;
81 void __iomem *regs;
82 int irq;
83 int opened;
84 int reset_pin;
85 };
86
87 #define get_chip(card) ((struct atmel_ac97c *)(card)->private_data)
88
89 #define ac97c_writel(chip, reg, val) \
90 __raw_writel((val), (chip)->regs + AC97C_##reg)
91 #define ac97c_readl(chip, reg) \
92 __raw_readl((chip)->regs + AC97C_##reg)
93
94 /* This function is called by the DMA driver. */
95 static void atmel_ac97c_dma_playback_period_done(void *arg)
96 {
97 struct atmel_ac97c *chip = arg;
98 snd_pcm_period_elapsed(chip->playback_substream);
99 }
100
101 static void atmel_ac97c_dma_capture_period_done(void *arg)
102 {
103 struct atmel_ac97c *chip = arg;
104 snd_pcm_period_elapsed(chip->capture_substream);
105 }
106
107 static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip,
108 struct snd_pcm_substream *substream,
109 enum dma_transfer_direction direction)
110 {
111 struct dma_chan *chan;
112 struct dw_cyclic_desc *cdesc;
113 struct snd_pcm_runtime *runtime = substream->runtime;
114 unsigned long buffer_len, period_len;
115
116 /*
117 * We don't do DMA on "complex" transfers, i.e. with
118 * non-halfword-aligned buffers or lengths.
119 */
120 if (runtime->dma_addr & 1 || runtime->buffer_size & 1) {
121 dev_dbg(&chip->pdev->dev, "too complex transfer\n");
122 return -EINVAL;
123 }
124
125 if (direction == DMA_MEM_TO_DEV)
126 chan = chip->dma.tx_chan;
127 else
128 chan = chip->dma.rx_chan;
129
130 buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
131 period_len = frames_to_bytes(runtime, runtime->period_size);
132
133 cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len,
134 period_len, direction);
135 if (IS_ERR(cdesc)) {
136 dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n");
137 return PTR_ERR(cdesc);
138 }
139
140 if (direction == DMA_MEM_TO_DEV) {
141 cdesc->period_callback = atmel_ac97c_dma_playback_period_done;
142 set_bit(DMA_TX_READY, &chip->flags);
143 } else {
144 cdesc->period_callback = atmel_ac97c_dma_capture_period_done;
145 set_bit(DMA_RX_READY, &chip->flags);
146 }
147
148 cdesc->period_callback_param = chip;
149
150 return 0;
151 }
152
153 static struct snd_pcm_hardware atmel_ac97c_hw = {
154 .info = (SNDRV_PCM_INFO_MMAP
155 | SNDRV_PCM_INFO_MMAP_VALID
156 | SNDRV_PCM_INFO_INTERLEAVED
157 | SNDRV_PCM_INFO_BLOCK_TRANSFER
158 | SNDRV_PCM_INFO_JOINT_DUPLEX
159 | SNDRV_PCM_INFO_RESUME
160 | SNDRV_PCM_INFO_PAUSE),
161 .formats = (SNDRV_PCM_FMTBIT_S16_BE
162 | SNDRV_PCM_FMTBIT_S16_LE),
163 .rates = (SNDRV_PCM_RATE_CONTINUOUS),
164 .rate_min = 4000,
165 .rate_max = 48000,
166 .channels_min = 1,
167 .channels_max = 2,
168 .buffer_bytes_max = 2 * 2 * 64 * 2048,
169 .period_bytes_min = 4096,
170 .period_bytes_max = 4096,
171 .periods_min = 6,
172 .periods_max = 64,
173 };
174
175 static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream)
176 {
177 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
178 struct snd_pcm_runtime *runtime = substream->runtime;
179
180 mutex_lock(&opened_mutex);
181 chip->opened++;
182 runtime->hw = atmel_ac97c_hw;
183 if (chip->cur_rate) {
184 runtime->hw.rate_min = chip->cur_rate;
185 runtime->hw.rate_max = chip->cur_rate;
186 }
187 if (chip->cur_format)
188 runtime->hw.formats = pcm_format_to_bits(chip->cur_format);
189 mutex_unlock(&opened_mutex);
190 chip->playback_substream = substream;
191 return 0;
192 }
193
194 static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream)
195 {
196 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
197 struct snd_pcm_runtime *runtime = substream->runtime;
198
199 mutex_lock(&opened_mutex);
200 chip->opened++;
201 runtime->hw = atmel_ac97c_hw;
202 if (chip->cur_rate) {
203 runtime->hw.rate_min = chip->cur_rate;
204 runtime->hw.rate_max = chip->cur_rate;
205 }
206 if (chip->cur_format)
207 runtime->hw.formats = pcm_format_to_bits(chip->cur_format);
208 mutex_unlock(&opened_mutex);
209 chip->capture_substream = substream;
210 return 0;
211 }
212
213 static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream)
214 {
215 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
216
217 mutex_lock(&opened_mutex);
218 chip->opened--;
219 if (!chip->opened) {
220 chip->cur_rate = 0;
221 chip->cur_format = 0;
222 }
223 mutex_unlock(&opened_mutex);
224
225 chip->playback_substream = NULL;
226
227 return 0;
228 }
229
230 static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream)
231 {
232 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
233
234 mutex_lock(&opened_mutex);
235 chip->opened--;
236 if (!chip->opened) {
237 chip->cur_rate = 0;
238 chip->cur_format = 0;
239 }
240 mutex_unlock(&opened_mutex);
241
242 chip->capture_substream = NULL;
243
244 return 0;
245 }
246
247 static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream,
248 struct snd_pcm_hw_params *hw_params)
249 {
250 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
251 int retval;
252
253 retval = snd_pcm_lib_malloc_pages(substream,
254 params_buffer_bytes(hw_params));
255 if (retval < 0)
256 return retval;
257 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
258 if (cpu_is_at32ap7000()) {
259 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
260 if (retval == 1)
261 if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
262 dw_dma_cyclic_free(chip->dma.tx_chan);
263 }
264 /* Set restrictions to params. */
265 mutex_lock(&opened_mutex);
266 chip->cur_rate = params_rate(hw_params);
267 chip->cur_format = params_format(hw_params);
268 mutex_unlock(&opened_mutex);
269
270 return retval;
271 }
272
273 static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream,
274 struct snd_pcm_hw_params *hw_params)
275 {
276 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
277 int retval;
278
279 retval = snd_pcm_lib_malloc_pages(substream,
280 params_buffer_bytes(hw_params));
281 if (retval < 0)
282 return retval;
283 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
284 if (cpu_is_at32ap7000() && retval == 1)
285 if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
286 dw_dma_cyclic_free(chip->dma.rx_chan);
287
288 /* Set restrictions to params. */
289 mutex_lock(&opened_mutex);
290 chip->cur_rate = params_rate(hw_params);
291 chip->cur_format = params_format(hw_params);
292 mutex_unlock(&opened_mutex);
293
294 return retval;
295 }
296
297 static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream)
298 {
299 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
300 if (cpu_is_at32ap7000()) {
301 if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
302 dw_dma_cyclic_free(chip->dma.tx_chan);
303 }
304 return snd_pcm_lib_free_pages(substream);
305 }
306
307 static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream)
308 {
309 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
310 if (cpu_is_at32ap7000()) {
311 if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
312 dw_dma_cyclic_free(chip->dma.rx_chan);
313 }
314 return snd_pcm_lib_free_pages(substream);
315 }
316
317 static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
318 {
319 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
320 struct snd_pcm_runtime *runtime = substream->runtime;
321 int block_size = frames_to_bytes(runtime, runtime->period_size);
322 unsigned long word = ac97c_readl(chip, OCA);
323 int retval;
324
325 chip->playback_period = 0;
326 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
327
328 /* assign channels to AC97C channel A */
329 switch (runtime->channels) {
330 case 1:
331 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
332 break;
333 case 2:
334 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
335 | AC97C_CH_ASSIGN(PCM_RIGHT, A);
336 break;
337 default:
338 /* TODO: support more than two channels */
339 return -EINVAL;
340 }
341 ac97c_writel(chip, OCA, word);
342
343 /* configure sample format and size */
344 word = ac97c_readl(chip, CAMR);
345 if (chip->opened <= 1)
346 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
347 else
348 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
349
350 switch (runtime->format) {
351 case SNDRV_PCM_FORMAT_S16_LE:
352 if (cpu_is_at32ap7000())
353 word |= AC97C_CMR_CEM_LITTLE;
354 break;
355 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
356 word &= ~(AC97C_CMR_CEM_LITTLE);
357 break;
358 default:
359 word = ac97c_readl(chip, OCA);
360 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
361 ac97c_writel(chip, OCA, word);
362 return -EINVAL;
363 }
364
365 /* Enable underrun interrupt on channel A */
366 word |= AC97C_CSR_UNRUN;
367
368 ac97c_writel(chip, CAMR, word);
369
370 /* Enable channel A event interrupt */
371 word = ac97c_readl(chip, IMR);
372 word |= AC97C_SR_CAEVT;
373 ac97c_writel(chip, IER, word);
374
375 /* set variable rate if needed */
376 if (runtime->rate != 48000) {
377 word = ac97c_readl(chip, MR);
378 word |= AC97C_MR_VRA;
379 ac97c_writel(chip, MR, word);
380 } else {
381 word = ac97c_readl(chip, MR);
382 word &= ~(AC97C_MR_VRA);
383 ac97c_writel(chip, MR, word);
384 }
385
386 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE,
387 runtime->rate);
388 if (retval)
389 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
390 runtime->rate);
391
392 if (cpu_is_at32ap7000()) {
393 if (!test_bit(DMA_TX_READY, &chip->flags))
394 retval = atmel_ac97c_prepare_dma(chip, substream,
395 DMA_MEM_TO_DEV);
396 } else {
397 /* Initialize and start the PDC */
398 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR);
399 writel(block_size / 2, chip->regs + ATMEL_PDC_TCR);
400 writel(runtime->dma_addr + block_size,
401 chip->regs + ATMEL_PDC_TNPR);
402 writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR);
403 }
404
405 return retval;
406 }
407
408 static int atmel_ac97c_capture_prepare(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 int block_size = frames_to_bytes(runtime, runtime->period_size);
413 unsigned long word = ac97c_readl(chip, ICA);
414 int retval;
415
416 chip->capture_period = 0;
417 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
418
419 /* assign channels to AC97C channel A */
420 switch (runtime->channels) {
421 case 1:
422 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
423 break;
424 case 2:
425 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
426 | AC97C_CH_ASSIGN(PCM_RIGHT, A);
427 break;
428 default:
429 /* TODO: support more than two channels */
430 return -EINVAL;
431 }
432 ac97c_writel(chip, ICA, word);
433
434 /* configure sample format and size */
435 word = ac97c_readl(chip, CAMR);
436 if (chip->opened <= 1)
437 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
438 else
439 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
440
441 switch (runtime->format) {
442 case SNDRV_PCM_FORMAT_S16_LE:
443 if (cpu_is_at32ap7000())
444 word |= AC97C_CMR_CEM_LITTLE;
445 break;
446 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
447 word &= ~(AC97C_CMR_CEM_LITTLE);
448 break;
449 default:
450 word = ac97c_readl(chip, ICA);
451 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
452 ac97c_writel(chip, ICA, word);
453 return -EINVAL;
454 }
455
456 /* Enable overrun interrupt on channel A */
457 word |= AC97C_CSR_OVRUN;
458
459 ac97c_writel(chip, CAMR, word);
460
461 /* Enable channel A event interrupt */
462 word = ac97c_readl(chip, IMR);
463 word |= AC97C_SR_CAEVT;
464 ac97c_writel(chip, IER, word);
465
466 /* set variable rate if needed */
467 if (runtime->rate != 48000) {
468 word = ac97c_readl(chip, MR);
469 word |= AC97C_MR_VRA;
470 ac97c_writel(chip, MR, word);
471 } else {
472 word = ac97c_readl(chip, MR);
473 word &= ~(AC97C_MR_VRA);
474 ac97c_writel(chip, MR, word);
475 }
476
477 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE,
478 runtime->rate);
479 if (retval)
480 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
481 runtime->rate);
482
483 if (cpu_is_at32ap7000()) {
484 if (!test_bit(DMA_RX_READY, &chip->flags))
485 retval = atmel_ac97c_prepare_dma(chip, substream,
486 DMA_DEV_TO_MEM);
487 } else {
488 /* Initialize and start the PDC */
489 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR);
490 writel(block_size / 2, chip->regs + ATMEL_PDC_RCR);
491 writel(runtime->dma_addr + block_size,
492 chip->regs + ATMEL_PDC_RNPR);
493 writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR);
494 }
495
496 return retval;
497 }
498
499 static int
500 atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
501 {
502 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
503 unsigned long camr, ptcr = 0;
504 int retval = 0;
505
506 camr = ac97c_readl(chip, CAMR);
507
508 switch (cmd) {
509 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
510 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
511 case SNDRV_PCM_TRIGGER_START:
512 if (cpu_is_at32ap7000()) {
513 retval = dw_dma_cyclic_start(chip->dma.tx_chan);
514 if (retval)
515 goto out;
516 } else {
517 ptcr = ATMEL_PDC_TXTEN;
518 }
519 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX;
520 break;
521 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
522 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
523 case SNDRV_PCM_TRIGGER_STOP:
524 if (cpu_is_at32ap7000())
525 dw_dma_cyclic_stop(chip->dma.tx_chan);
526 else
527 ptcr |= ATMEL_PDC_TXTDIS;
528 if (chip->opened <= 1)
529 camr &= ~AC97C_CMR_CENA;
530 break;
531 default:
532 retval = -EINVAL;
533 goto out;
534 }
535
536 ac97c_writel(chip, CAMR, camr);
537 if (!cpu_is_at32ap7000())
538 writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
539 out:
540 return retval;
541 }
542
543 static int
544 atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
545 {
546 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
547 unsigned long camr, ptcr = 0;
548 int retval = 0;
549
550 camr = ac97c_readl(chip, CAMR);
551 ptcr = readl(chip->regs + ATMEL_PDC_PTSR);
552
553 switch (cmd) {
554 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
555 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
556 case SNDRV_PCM_TRIGGER_START:
557 if (cpu_is_at32ap7000()) {
558 retval = dw_dma_cyclic_start(chip->dma.rx_chan);
559 if (retval)
560 goto out;
561 } else {
562 ptcr = ATMEL_PDC_RXTEN;
563 }
564 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX;
565 break;
566 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
567 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
568 case SNDRV_PCM_TRIGGER_STOP:
569 if (cpu_is_at32ap7000())
570 dw_dma_cyclic_stop(chip->dma.rx_chan);
571 else
572 ptcr |= (ATMEL_PDC_RXTDIS);
573 if (chip->opened <= 1)
574 camr &= ~AC97C_CMR_CENA;
575 break;
576 default:
577 retval = -EINVAL;
578 break;
579 }
580
581 ac97c_writel(chip, CAMR, camr);
582 if (!cpu_is_at32ap7000())
583 writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
584 out:
585 return retval;
586 }
587
588 static snd_pcm_uframes_t
589 atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream)
590 {
591 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
592 struct snd_pcm_runtime *runtime = substream->runtime;
593 snd_pcm_uframes_t frames;
594 unsigned long bytes;
595
596 if (cpu_is_at32ap7000())
597 bytes = dw_dma_get_src_addr(chip->dma.tx_chan);
598 else
599 bytes = readl(chip->regs + ATMEL_PDC_TPR);
600 bytes -= runtime->dma_addr;
601
602 frames = bytes_to_frames(runtime, bytes);
603 if (frames >= runtime->buffer_size)
604 frames -= runtime->buffer_size;
605 return frames;
606 }
607
608 static snd_pcm_uframes_t
609 atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream)
610 {
611 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
612 struct snd_pcm_runtime *runtime = substream->runtime;
613 snd_pcm_uframes_t frames;
614 unsigned long bytes;
615
616 if (cpu_is_at32ap7000())
617 bytes = dw_dma_get_dst_addr(chip->dma.rx_chan);
618 else
619 bytes = readl(chip->regs + ATMEL_PDC_RPR);
620 bytes -= runtime->dma_addr;
621
622 frames = bytes_to_frames(runtime, bytes);
623 if (frames >= runtime->buffer_size)
624 frames -= runtime->buffer_size;
625 return frames;
626 }
627
628 static struct snd_pcm_ops atmel_ac97_playback_ops = {
629 .open = atmel_ac97c_playback_open,
630 .close = atmel_ac97c_playback_close,
631 .ioctl = snd_pcm_lib_ioctl,
632 .hw_params = atmel_ac97c_playback_hw_params,
633 .hw_free = atmel_ac97c_playback_hw_free,
634 .prepare = atmel_ac97c_playback_prepare,
635 .trigger = atmel_ac97c_playback_trigger,
636 .pointer = atmel_ac97c_playback_pointer,
637 };
638
639 static struct snd_pcm_ops atmel_ac97_capture_ops = {
640 .open = atmel_ac97c_capture_open,
641 .close = atmel_ac97c_capture_close,
642 .ioctl = snd_pcm_lib_ioctl,
643 .hw_params = atmel_ac97c_capture_hw_params,
644 .hw_free = atmel_ac97c_capture_hw_free,
645 .prepare = atmel_ac97c_capture_prepare,
646 .trigger = atmel_ac97c_capture_trigger,
647 .pointer = atmel_ac97c_capture_pointer,
648 };
649
650 static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
651 {
652 struct atmel_ac97c *chip = (struct atmel_ac97c *)dev;
653 irqreturn_t retval = IRQ_NONE;
654 u32 sr = ac97c_readl(chip, SR);
655 u32 casr = ac97c_readl(chip, CASR);
656 u32 cosr = ac97c_readl(chip, COSR);
657 u32 camr = ac97c_readl(chip, CAMR);
658
659 if (sr & AC97C_SR_CAEVT) {
660 struct snd_pcm_runtime *runtime;
661 int offset, next_period, block_size;
662 dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n",
663 casr & AC97C_CSR_OVRUN ? " OVRUN" : "",
664 casr & AC97C_CSR_RXRDY ? " RXRDY" : "",
665 casr & AC97C_CSR_UNRUN ? " UNRUN" : "",
666 casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
667 casr & AC97C_CSR_TXRDY ? " TXRDY" : "",
668 !casr ? " NONE" : "");
669 if (!cpu_is_at32ap7000()) {
670 if ((casr & camr) & AC97C_CSR_ENDTX) {
671 runtime = chip->playback_substream->runtime;
672 block_size = frames_to_bytes(runtime,
673 runtime->period_size);
674 chip->playback_period++;
675
676 if (chip->playback_period == runtime->periods)
677 chip->playback_period = 0;
678 next_period = chip->playback_period + 1;
679 if (next_period == runtime->periods)
680 next_period = 0;
681
682 offset = block_size * next_period;
683
684 writel(runtime->dma_addr + offset,
685 chip->regs + ATMEL_PDC_TNPR);
686 writel(block_size / 2,
687 chip->regs + ATMEL_PDC_TNCR);
688
689 snd_pcm_period_elapsed(
690 chip->playback_substream);
691 }
692 if ((casr & camr) & AC97C_CSR_ENDRX) {
693 runtime = chip->capture_substream->runtime;
694 block_size = frames_to_bytes(runtime,
695 runtime->period_size);
696 chip->capture_period++;
697
698 if (chip->capture_period == runtime->periods)
699 chip->capture_period = 0;
700 next_period = chip->capture_period + 1;
701 if (next_period == runtime->periods)
702 next_period = 0;
703
704 offset = block_size * next_period;
705
706 writel(runtime->dma_addr + offset,
707 chip->regs + ATMEL_PDC_RNPR);
708 writel(block_size / 2,
709 chip->regs + ATMEL_PDC_RNCR);
710 snd_pcm_period_elapsed(chip->capture_substream);
711 }
712 }
713 retval = IRQ_HANDLED;
714 }
715
716 if (sr & AC97C_SR_COEVT) {
717 dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n",
718 cosr & AC97C_CSR_OVRUN ? " OVRUN" : "",
719 cosr & AC97C_CSR_RXRDY ? " RXRDY" : "",
720 cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
721 cosr & AC97C_CSR_TXRDY ? " TXRDY" : "",
722 !cosr ? " NONE" : "");
723 retval = IRQ_HANDLED;
724 }
725
726 if (retval == IRQ_NONE) {
727 dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x "
728 "casr 0x%08x cosr 0x%08x\n", sr, casr, cosr);
729 }
730
731 return retval;
732 }
733
734 static struct ac97_pcm at91_ac97_pcm_defs[] = {
735 /* Playback */
736 {
737 .exclusive = 1,
738 .r = { {
739 .slots = ((1 << AC97_SLOT_PCM_LEFT)
740 | (1 << AC97_SLOT_PCM_RIGHT)),
741 } },
742 },
743 /* PCM in */
744 {
745 .stream = 1,
746 .exclusive = 1,
747 .r = { {
748 .slots = ((1 << AC97_SLOT_PCM_LEFT)
749 | (1 << AC97_SLOT_PCM_RIGHT)),
750 } }
751 },
752 /* Mic in */
753 {
754 .stream = 1,
755 .exclusive = 1,
756 .r = { {
757 .slots = (1<<AC97_SLOT_MIC),
758 } }
759 },
760 };
761
762 static int atmel_ac97c_pcm_new(struct atmel_ac97c *chip)
763 {
764 struct snd_pcm *pcm;
765 struct snd_pcm_hardware hw = atmel_ac97c_hw;
766 int capture, playback, retval, err;
767
768 capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
769 playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
770
771 if (!cpu_is_at32ap7000()) {
772 err = snd_ac97_pcm_assign(chip->ac97_bus,
773 ARRAY_SIZE(at91_ac97_pcm_defs),
774 at91_ac97_pcm_defs);
775 if (err)
776 return err;
777 }
778 retval = snd_pcm_new(chip->card, chip->card->shortname,
779 0, playback, capture, &pcm);
780 if (retval)
781 return retval;
782
783 if (capture)
784 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
785 &atmel_ac97_capture_ops);
786 if (playback)
787 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
788 &atmel_ac97_playback_ops);
789
790 retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
791 &chip->pdev->dev, hw.periods_min * hw.period_bytes_min,
792 hw.buffer_bytes_max);
793 if (retval)
794 return retval;
795
796 pcm->private_data = chip;
797 pcm->info_flags = 0;
798 strcpy(pcm->name, chip->card->shortname);
799 chip->pcm = pcm;
800
801 return 0;
802 }
803
804 static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip)
805 {
806 struct snd_ac97_template template;
807 memset(&template, 0, sizeof(template));
808 template.private_data = chip;
809 return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97);
810 }
811
812 static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg,
813 unsigned short val)
814 {
815 struct atmel_ac97c *chip = get_chip(ac97);
816 unsigned long word;
817 int timeout = 40;
818
819 word = (reg & 0x7f) << 16 | val;
820
821 do {
822 if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) {
823 ac97c_writel(chip, COTHR, word);
824 return;
825 }
826 udelay(1);
827 } while (--timeout);
828
829 dev_dbg(&chip->pdev->dev, "codec write timeout\n");
830 }
831
832 static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97,
833 unsigned short reg)
834 {
835 struct atmel_ac97c *chip = get_chip(ac97);
836 unsigned long word;
837 int timeout = 40;
838 int write = 10;
839
840 word = (0x80 | (reg & 0x7f)) << 16;
841
842 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0)
843 ac97c_readl(chip, CORHR);
844
845 retry_write:
846 timeout = 40;
847
848 do {
849 if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) {
850 ac97c_writel(chip, COTHR, word);
851 goto read_reg;
852 }
853 udelay(10);
854 } while (--timeout);
855
856 if (!--write)
857 goto timed_out;
858 goto retry_write;
859
860 read_reg:
861 do {
862 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) {
863 unsigned short val = ac97c_readl(chip, CORHR);
864 return val;
865 }
866 udelay(10);
867 } while (--timeout);
868
869 if (!--write)
870 goto timed_out;
871 goto retry_write;
872
873 timed_out:
874 dev_dbg(&chip->pdev->dev, "codec read timeout\n");
875 return 0xffff;
876 }
877
878 static bool filter(struct dma_chan *chan, void *slave)
879 {
880 struct dw_dma_slave *dws = slave;
881
882 if (dws->dma_dev == chan->device->dev) {
883 chan->private = dws;
884 return true;
885 } else
886 return false;
887 }
888
889 static void atmel_ac97c_reset(struct atmel_ac97c *chip)
890 {
891 ac97c_writel(chip, MR, 0);
892 ac97c_writel(chip, MR, AC97C_MR_ENA);
893 ac97c_writel(chip, CAMR, 0);
894 ac97c_writel(chip, COMR, 0);
895
896 if (gpio_is_valid(chip->reset_pin)) {
897 gpio_set_value(chip->reset_pin, 0);
898 /* AC97 v2.2 specifications says minimum 1 us. */
899 udelay(2);
900 gpio_set_value(chip->reset_pin, 1);
901 } else {
902 ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA);
903 udelay(2);
904 ac97c_writel(chip, MR, AC97C_MR_ENA);
905 }
906 }
907
908 #ifdef CONFIG_OF
909 static const struct of_device_id atmel_ac97c_dt_ids[] = {
910 { .compatible = "atmel,at91sam9263-ac97c", },
911 { }
912 };
913 MODULE_DEVICE_TABLE(of, atmel_ac97c_dt_ids);
914
915 static struct ac97c_platform_data *atmel_ac97c_probe_dt(struct device *dev)
916 {
917 struct ac97c_platform_data *pdata;
918 struct device_node *node = dev->of_node;
919 const struct of_device_id *match;
920
921 if (!node) {
922 dev_err(dev, "Device does not have associated DT data\n");
923 return ERR_PTR(-EINVAL);
924 }
925
926 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
927 if (!pdata)
928 return ERR_PTR(-ENOMEM);
929
930 pdata->reset_pin = of_get_named_gpio(dev->of_node, "ac97-gpios", 2);
931
932 return pdata;
933 }
934 #else
935 static struct ac97c_platform_data *atmel_ac97c_probe_dt(struct device *dev)
936 {
937 dev_err(dev, "no platform data defined\n");
938 return ERR_PTR(-ENXIO);
939 }
940 #endif
941
942 static int atmel_ac97c_probe(struct platform_device *pdev)
943 {
944 struct snd_card *card;
945 struct atmel_ac97c *chip;
946 struct resource *regs;
947 struct ac97c_platform_data *pdata;
948 struct clk *pclk;
949 static struct snd_ac97_bus_ops ops = {
950 .write = atmel_ac97c_write,
951 .read = atmel_ac97c_read,
952 };
953 int retval;
954 int irq;
955
956 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
957 if (!regs) {
958 dev_dbg(&pdev->dev, "no memory resource\n");
959 return -ENXIO;
960 }
961
962 pdata = dev_get_platdata(&pdev->dev);
963 if (!pdata) {
964 pdata = atmel_ac97c_probe_dt(&pdev->dev);
965 if (IS_ERR(pdata))
966 return PTR_ERR(pdata);
967 }
968
969 irq = platform_get_irq(pdev, 0);
970 if (irq < 0) {
971 dev_dbg(&pdev->dev, "could not get irq\n");
972 return -ENXIO;
973 }
974
975 if (cpu_is_at32ap7000()) {
976 pclk = clk_get(&pdev->dev, "pclk");
977 } else {
978 pclk = clk_get(&pdev->dev, "ac97_clk");
979 }
980
981 if (IS_ERR(pclk)) {
982 dev_dbg(&pdev->dev, "no peripheral clock\n");
983 return PTR_ERR(pclk);
984 }
985 clk_prepare_enable(pclk);
986
987 retval = snd_card_new(&pdev->dev, SNDRV_DEFAULT_IDX1,
988 SNDRV_DEFAULT_STR1, THIS_MODULE,
989 sizeof(struct atmel_ac97c), &card);
990 if (retval) {
991 dev_dbg(&pdev->dev, "could not create sound card device\n");
992 goto err_snd_card_new;
993 }
994
995 chip = get_chip(card);
996
997 retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip);
998 if (retval) {
999 dev_dbg(&pdev->dev, "unable to request irq %d\n", irq);
1000 goto err_request_irq;
1001 }
1002 chip->irq = irq;
1003
1004 spin_lock_init(&chip->lock);
1005
1006 strcpy(card->driver, "Atmel AC97C");
1007 strcpy(card->shortname, "Atmel AC97C");
1008 sprintf(card->longname, "Atmel AC97 controller");
1009
1010 chip->card = card;
1011 chip->pclk = pclk;
1012 chip->pdev = pdev;
1013 chip->regs = ioremap(regs->start, resource_size(regs));
1014
1015 if (!chip->regs) {
1016 dev_dbg(&pdev->dev, "could not remap register memory\n");
1017 retval = -ENOMEM;
1018 goto err_ioremap;
1019 }
1020
1021 if (gpio_is_valid(pdata->reset_pin)) {
1022 if (gpio_request(pdata->reset_pin, "reset_pin")) {
1023 dev_dbg(&pdev->dev, "reset pin not available\n");
1024 chip->reset_pin = -ENODEV;
1025 } else {
1026 gpio_direction_output(pdata->reset_pin, 1);
1027 chip->reset_pin = pdata->reset_pin;
1028 }
1029 } else {
1030 chip->reset_pin = -EINVAL;
1031 }
1032
1033 atmel_ac97c_reset(chip);
1034
1035 /* Enable overrun interrupt from codec channel */
1036 ac97c_writel(chip, COMR, AC97C_CSR_OVRUN);
1037 ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT);
1038
1039 retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus);
1040 if (retval) {
1041 dev_dbg(&pdev->dev, "could not register on ac97 bus\n");
1042 goto err_ac97_bus;
1043 }
1044
1045 retval = atmel_ac97c_mixer_new(chip);
1046 if (retval) {
1047 dev_dbg(&pdev->dev, "could not register ac97 mixer\n");
1048 goto err_ac97_bus;
1049 }
1050
1051 if (cpu_is_at32ap7000()) {
1052 if (pdata->rx_dws.dma_dev) {
1053 dma_cap_mask_t mask;
1054
1055 dma_cap_zero(mask);
1056 dma_cap_set(DMA_SLAVE, mask);
1057
1058 chip->dma.rx_chan = dma_request_channel(mask, filter,
1059 &pdata->rx_dws);
1060 if (chip->dma.rx_chan) {
1061 struct dma_slave_config dma_conf = {
1062 .src_addr = regs->start + AC97C_CARHR +
1063 2,
1064 .src_addr_width =
1065 DMA_SLAVE_BUSWIDTH_2_BYTES,
1066 .src_maxburst = 1,
1067 .dst_maxburst = 1,
1068 .direction = DMA_DEV_TO_MEM,
1069 .device_fc = false,
1070 };
1071
1072 dmaengine_slave_config(chip->dma.rx_chan,
1073 &dma_conf);
1074 }
1075
1076 dev_info(&chip->pdev->dev, "using %s for DMA RX\n",
1077 dev_name(&chip->dma.rx_chan->dev->device));
1078 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1079 }
1080
1081 if (pdata->tx_dws.dma_dev) {
1082 dma_cap_mask_t mask;
1083
1084 dma_cap_zero(mask);
1085 dma_cap_set(DMA_SLAVE, mask);
1086
1087 chip->dma.tx_chan = dma_request_channel(mask, filter,
1088 &pdata->tx_dws);
1089 if (chip->dma.tx_chan) {
1090 struct dma_slave_config dma_conf = {
1091 .dst_addr = regs->start + AC97C_CATHR +
1092 2,
1093 .dst_addr_width =
1094 DMA_SLAVE_BUSWIDTH_2_BYTES,
1095 .src_maxburst = 1,
1096 .dst_maxburst = 1,
1097 .direction = DMA_MEM_TO_DEV,
1098 .device_fc = false,
1099 };
1100
1101 dmaengine_slave_config(chip->dma.tx_chan,
1102 &dma_conf);
1103 }
1104
1105 dev_info(&chip->pdev->dev, "using %s for DMA TX\n",
1106 dev_name(&chip->dma.tx_chan->dev->device));
1107 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1108 }
1109
1110 if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) &&
1111 !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) {
1112 dev_dbg(&pdev->dev, "DMA not available\n");
1113 retval = -ENODEV;
1114 goto err_dma;
1115 }
1116 } else {
1117 /* Just pretend that we have DMA channel(for at91 i is actually
1118 * the PDC) */
1119 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1120 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1121 }
1122
1123 retval = atmel_ac97c_pcm_new(chip);
1124 if (retval) {
1125 dev_dbg(&pdev->dev, "could not register ac97 pcm device\n");
1126 goto err_dma;
1127 }
1128
1129 retval = snd_card_register(card);
1130 if (retval) {
1131 dev_dbg(&pdev->dev, "could not register sound card\n");
1132 goto err_dma;
1133 }
1134
1135 platform_set_drvdata(pdev, card);
1136
1137 dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n",
1138 chip->regs, irq);
1139
1140 return 0;
1141
1142 err_dma:
1143 if (cpu_is_at32ap7000()) {
1144 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1145 dma_release_channel(chip->dma.rx_chan);
1146 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1147 dma_release_channel(chip->dma.tx_chan);
1148 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1149 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1150 chip->dma.rx_chan = NULL;
1151 chip->dma.tx_chan = NULL;
1152 }
1153 err_ac97_bus:
1154 if (gpio_is_valid(chip->reset_pin))
1155 gpio_free(chip->reset_pin);
1156
1157 iounmap(chip->regs);
1158 err_ioremap:
1159 free_irq(irq, chip);
1160 err_request_irq:
1161 snd_card_free(card);
1162 err_snd_card_new:
1163 clk_disable_unprepare(pclk);
1164 clk_put(pclk);
1165 return retval;
1166 }
1167
1168 #ifdef CONFIG_PM_SLEEP
1169 static int atmel_ac97c_suspend(struct device *pdev)
1170 {
1171 struct snd_card *card = dev_get_drvdata(pdev);
1172 struct atmel_ac97c *chip = card->private_data;
1173
1174 if (cpu_is_at32ap7000()) {
1175 if (test_bit(DMA_RX_READY, &chip->flags))
1176 dw_dma_cyclic_stop(chip->dma.rx_chan);
1177 if (test_bit(DMA_TX_READY, &chip->flags))
1178 dw_dma_cyclic_stop(chip->dma.tx_chan);
1179 }
1180 clk_disable_unprepare(chip->pclk);
1181
1182 return 0;
1183 }
1184
1185 static int atmel_ac97c_resume(struct device *pdev)
1186 {
1187 struct snd_card *card = dev_get_drvdata(pdev);
1188 struct atmel_ac97c *chip = card->private_data;
1189
1190 clk_prepare_enable(chip->pclk);
1191 if (cpu_is_at32ap7000()) {
1192 if (test_bit(DMA_RX_READY, &chip->flags))
1193 dw_dma_cyclic_start(chip->dma.rx_chan);
1194 if (test_bit(DMA_TX_READY, &chip->flags))
1195 dw_dma_cyclic_start(chip->dma.tx_chan);
1196 }
1197 return 0;
1198 }
1199
1200 static SIMPLE_DEV_PM_OPS(atmel_ac97c_pm, atmel_ac97c_suspend, atmel_ac97c_resume);
1201 #define ATMEL_AC97C_PM_OPS &atmel_ac97c_pm
1202 #else
1203 #define ATMEL_AC97C_PM_OPS NULL
1204 #endif
1205
1206 static int atmel_ac97c_remove(struct platform_device *pdev)
1207 {
1208 struct snd_card *card = platform_get_drvdata(pdev);
1209 struct atmel_ac97c *chip = get_chip(card);
1210
1211 if (gpio_is_valid(chip->reset_pin))
1212 gpio_free(chip->reset_pin);
1213
1214 ac97c_writel(chip, CAMR, 0);
1215 ac97c_writel(chip, COMR, 0);
1216 ac97c_writel(chip, MR, 0);
1217
1218 clk_disable_unprepare(chip->pclk);
1219 clk_put(chip->pclk);
1220 iounmap(chip->regs);
1221 free_irq(chip->irq, chip);
1222
1223 if (cpu_is_at32ap7000()) {
1224 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1225 dma_release_channel(chip->dma.rx_chan);
1226 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1227 dma_release_channel(chip->dma.tx_chan);
1228 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1229 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1230 chip->dma.rx_chan = NULL;
1231 chip->dma.tx_chan = NULL;
1232 }
1233
1234 snd_card_free(card);
1235
1236 return 0;
1237 }
1238
1239 static struct platform_driver atmel_ac97c_driver = {
1240 .probe = atmel_ac97c_probe,
1241 .remove = atmel_ac97c_remove,
1242 .driver = {
1243 .name = "atmel_ac97c",
1244 .pm = ATMEL_AC97C_PM_OPS,
1245 .of_match_table = of_match_ptr(atmel_ac97c_dt_ids),
1246 },
1247 };
1248 module_platform_driver(atmel_ac97c_driver);
1249
1250 MODULE_LICENSE("GPL");
1251 MODULE_DESCRIPTION("Driver for Atmel AC97 controller");
1252 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");
Linux with added FPC-III support