Loading...
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
48enum {
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 */
56static DEFINE_MUTEX(opened_mutex);
57
58struct atmel_ac97c_dma {
59 struct dma_chan *rx_chan;
60 struct dma_chan *tx_chan;
61};
62
63struct 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. */
95static 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
101static 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
107static 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
153static 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
175static 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
194static 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
213static 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
230static 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
247static 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
273static 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
297static 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
307static 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
317static 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
408static 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
499static int
500atmel_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);
539out:
540 return retval;
541}
542
543static int
544atmel_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);
584out:
585 return retval;
586}
587
588static snd_pcm_uframes_t
589atmel_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
608static snd_pcm_uframes_t
609atmel_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
628static 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
639static 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
650static 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
734static 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
762static 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
804static 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
812static 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
832static 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
845retry_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
860read_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
873timed_out:
874 dev_dbg(&chip->pdev->dev, "codec read timeout\n");
875 return 0xffff;
876}
877
878static 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
889static 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
909static const struct of_device_id atmel_ac97c_dt_ids[] = {
910 { .compatible = "atmel,at91sam9263-ac97c", },
911 { }
912};
913MODULE_DEVICE_TABLE(of, atmel_ac97c_dt_ids);
914
915static 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
920 if (!node) {
921 dev_err(dev, "Device does not have associated DT data\n");
922 return ERR_PTR(-EINVAL);
923 }
924
925 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
926 if (!pdata)
927 return ERR_PTR(-ENOMEM);
928
929 pdata->reset_pin = of_get_named_gpio(dev->of_node, "ac97-gpios", 2);
930
931 return pdata;
932}
933#else
934static struct ac97c_platform_data *atmel_ac97c_probe_dt(struct device *dev)
935{
936 dev_err(dev, "no platform data defined\n");
937 return ERR_PTR(-ENXIO);
938}
939#endif
940
941static int atmel_ac97c_probe(struct platform_device *pdev)
942{
943 struct snd_card *card;
944 struct atmel_ac97c *chip;
945 struct resource *regs;
946 struct ac97c_platform_data *pdata;
947 struct clk *pclk;
948 static struct snd_ac97_bus_ops ops = {
949 .write = atmel_ac97c_write,
950 .read = atmel_ac97c_read,
951 };
952 int retval;
953 int irq;
954
955 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
956 if (!regs) {
957 dev_dbg(&pdev->dev, "no memory resource\n");
958 return -ENXIO;
959 }
960
961 pdata = dev_get_platdata(&pdev->dev);
962 if (!pdata) {
963 pdata = atmel_ac97c_probe_dt(&pdev->dev);
964 if (IS_ERR(pdata))
965 return PTR_ERR(pdata);
966 }
967
968 irq = platform_get_irq(pdev, 0);
969 if (irq < 0) {
970 dev_dbg(&pdev->dev, "could not get irq\n");
971 return -ENXIO;
972 }
973
974 if (cpu_is_at32ap7000()) {
975 pclk = clk_get(&pdev->dev, "pclk");
976 } else {
977 pclk = clk_get(&pdev->dev, "ac97_clk");
978 }
979
980 if (IS_ERR(pclk)) {
981 dev_dbg(&pdev->dev, "no peripheral clock\n");
982 return PTR_ERR(pclk);
983 }
984 clk_prepare_enable(pclk);
985
986 retval = snd_card_new(&pdev->dev, SNDRV_DEFAULT_IDX1,
987 SNDRV_DEFAULT_STR1, THIS_MODULE,
988 sizeof(struct atmel_ac97c), &card);
989 if (retval) {
990 dev_dbg(&pdev->dev, "could not create sound card device\n");
991 goto err_snd_card_new;
992 }
993
994 chip = get_chip(card);
995
996 retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip);
997 if (retval) {
998 dev_dbg(&pdev->dev, "unable to request irq %d\n", irq);
999 goto err_request_irq;
1000 }
1001 chip->irq = irq;
1002
1003 spin_lock_init(&chip->lock);
1004
1005 strcpy(card->driver, "Atmel AC97C");
1006 strcpy(card->shortname, "Atmel AC97C");
1007 sprintf(card->longname, "Atmel AC97 controller");
1008
1009 chip->card = card;
1010 chip->pclk = pclk;
1011 chip->pdev = pdev;
1012 chip->regs = ioremap(regs->start, resource_size(regs));
1013
1014 if (!chip->regs) {
1015 dev_dbg(&pdev->dev, "could not remap register memory\n");
1016 retval = -ENOMEM;
1017 goto err_ioremap;
1018 }
1019
1020 if (gpio_is_valid(pdata->reset_pin)) {
1021 if (gpio_request(pdata->reset_pin, "reset_pin")) {
1022 dev_dbg(&pdev->dev, "reset pin not available\n");
1023 chip->reset_pin = -ENODEV;
1024 } else {
1025 gpio_direction_output(pdata->reset_pin, 1);
1026 chip->reset_pin = pdata->reset_pin;
1027 }
1028 } else {
1029 chip->reset_pin = -EINVAL;
1030 }
1031
1032 atmel_ac97c_reset(chip);
1033
1034 /* Enable overrun interrupt from codec channel */
1035 ac97c_writel(chip, COMR, AC97C_CSR_OVRUN);
1036 ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT);
1037
1038 retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus);
1039 if (retval) {
1040 dev_dbg(&pdev->dev, "could not register on ac97 bus\n");
1041 goto err_ac97_bus;
1042 }
1043
1044 retval = atmel_ac97c_mixer_new(chip);
1045 if (retval) {
1046 dev_dbg(&pdev->dev, "could not register ac97 mixer\n");
1047 goto err_ac97_bus;
1048 }
1049
1050 if (cpu_is_at32ap7000()) {
1051 if (pdata->rx_dws.dma_dev) {
1052 dma_cap_mask_t mask;
1053
1054 dma_cap_zero(mask);
1055 dma_cap_set(DMA_SLAVE, mask);
1056
1057 chip->dma.rx_chan = dma_request_channel(mask, filter,
1058 &pdata->rx_dws);
1059 if (chip->dma.rx_chan) {
1060 struct dma_slave_config dma_conf = {
1061 .src_addr = regs->start + AC97C_CARHR +
1062 2,
1063 .src_addr_width =
1064 DMA_SLAVE_BUSWIDTH_2_BYTES,
1065 .src_maxburst = 1,
1066 .dst_maxburst = 1,
1067 .direction = DMA_DEV_TO_MEM,
1068 .device_fc = false,
1069 };
1070
1071 dmaengine_slave_config(chip->dma.rx_chan,
1072 &dma_conf);
1073 }
1074
1075 dev_info(&chip->pdev->dev, "using %s for DMA RX\n",
1076 dev_name(&chip->dma.rx_chan->dev->device));
1077 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1078 }
1079
1080 if (pdata->tx_dws.dma_dev) {
1081 dma_cap_mask_t mask;
1082
1083 dma_cap_zero(mask);
1084 dma_cap_set(DMA_SLAVE, mask);
1085
1086 chip->dma.tx_chan = dma_request_channel(mask, filter,
1087 &pdata->tx_dws);
1088 if (chip->dma.tx_chan) {
1089 struct dma_slave_config dma_conf = {
1090 .dst_addr = regs->start + AC97C_CATHR +
1091 2,
1092 .dst_addr_width =
1093 DMA_SLAVE_BUSWIDTH_2_BYTES,
1094 .src_maxburst = 1,
1095 .dst_maxburst = 1,
1096 .direction = DMA_MEM_TO_DEV,
1097 .device_fc = false,
1098 };
1099
1100 dmaengine_slave_config(chip->dma.tx_chan,
1101 &dma_conf);
1102 }
1103
1104 dev_info(&chip->pdev->dev, "using %s for DMA TX\n",
1105 dev_name(&chip->dma.tx_chan->dev->device));
1106 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1107 }
1108
1109 if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) &&
1110 !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) {
1111 dev_dbg(&pdev->dev, "DMA not available\n");
1112 retval = -ENODEV;
1113 goto err_dma;
1114 }
1115 } else {
1116 /* Just pretend that we have DMA channel(for at91 i is actually
1117 * the PDC) */
1118 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1119 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1120 }
1121
1122 retval = atmel_ac97c_pcm_new(chip);
1123 if (retval) {
1124 dev_dbg(&pdev->dev, "could not register ac97 pcm device\n");
1125 goto err_dma;
1126 }
1127
1128 retval = snd_card_register(card);
1129 if (retval) {
1130 dev_dbg(&pdev->dev, "could not register sound card\n");
1131 goto err_dma;
1132 }
1133
1134 platform_set_drvdata(pdev, card);
1135
1136 dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n",
1137 chip->regs, irq);
1138
1139 return 0;
1140
1141err_dma:
1142 if (cpu_is_at32ap7000()) {
1143 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1144 dma_release_channel(chip->dma.rx_chan);
1145 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1146 dma_release_channel(chip->dma.tx_chan);
1147 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1148 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1149 chip->dma.rx_chan = NULL;
1150 chip->dma.tx_chan = NULL;
1151 }
1152err_ac97_bus:
1153 if (gpio_is_valid(chip->reset_pin))
1154 gpio_free(chip->reset_pin);
1155
1156 iounmap(chip->regs);
1157err_ioremap:
1158 free_irq(irq, chip);
1159err_request_irq:
1160 snd_card_free(card);
1161err_snd_card_new:
1162 clk_disable_unprepare(pclk);
1163 clk_put(pclk);
1164 return retval;
1165}
1166
1167#ifdef CONFIG_PM_SLEEP
1168static int atmel_ac97c_suspend(struct device *pdev)
1169{
1170 struct snd_card *card = dev_get_drvdata(pdev);
1171 struct atmel_ac97c *chip = card->private_data;
1172
1173 if (cpu_is_at32ap7000()) {
1174 if (test_bit(DMA_RX_READY, &chip->flags))
1175 dw_dma_cyclic_stop(chip->dma.rx_chan);
1176 if (test_bit(DMA_TX_READY, &chip->flags))
1177 dw_dma_cyclic_stop(chip->dma.tx_chan);
1178 }
1179 clk_disable_unprepare(chip->pclk);
1180
1181 return 0;
1182}
1183
1184static int atmel_ac97c_resume(struct device *pdev)
1185{
1186 struct snd_card *card = dev_get_drvdata(pdev);
1187 struct atmel_ac97c *chip = card->private_data;
1188
1189 clk_prepare_enable(chip->pclk);
1190 if (cpu_is_at32ap7000()) {
1191 if (test_bit(DMA_RX_READY, &chip->flags))
1192 dw_dma_cyclic_start(chip->dma.rx_chan);
1193 if (test_bit(DMA_TX_READY, &chip->flags))
1194 dw_dma_cyclic_start(chip->dma.tx_chan);
1195 }
1196 return 0;
1197}
1198
1199static SIMPLE_DEV_PM_OPS(atmel_ac97c_pm, atmel_ac97c_suspend, atmel_ac97c_resume);
1200#define ATMEL_AC97C_PM_OPS &atmel_ac97c_pm
1201#else
1202#define ATMEL_AC97C_PM_OPS NULL
1203#endif
1204
1205static int atmel_ac97c_remove(struct platform_device *pdev)
1206{
1207 struct snd_card *card = platform_get_drvdata(pdev);
1208 struct atmel_ac97c *chip = get_chip(card);
1209
1210 if (gpio_is_valid(chip->reset_pin))
1211 gpio_free(chip->reset_pin);
1212
1213 ac97c_writel(chip, CAMR, 0);
1214 ac97c_writel(chip, COMR, 0);
1215 ac97c_writel(chip, MR, 0);
1216
1217 clk_disable_unprepare(chip->pclk);
1218 clk_put(chip->pclk);
1219 iounmap(chip->regs);
1220 free_irq(chip->irq, chip);
1221
1222 if (cpu_is_at32ap7000()) {
1223 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1224 dma_release_channel(chip->dma.rx_chan);
1225 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1226 dma_release_channel(chip->dma.tx_chan);
1227 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1228 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1229 chip->dma.rx_chan = NULL;
1230 chip->dma.tx_chan = NULL;
1231 }
1232
1233 snd_card_free(card);
1234
1235 return 0;
1236}
1237
1238static struct platform_driver atmel_ac97c_driver = {
1239 .probe = atmel_ac97c_probe,
1240 .remove = atmel_ac97c_remove,
1241 .driver = {
1242 .name = "atmel_ac97c",
1243 .pm = ATMEL_AC97C_PM_OPS,
1244 .of_match_table = of_match_ptr(atmel_ac97c_dt_ids),
1245 },
1246};
1247module_platform_driver(atmel_ac97c_driver);
1248
1249MODULE_LICENSE("GPL");
1250MODULE_DESCRIPTION("Driver for Atmel AC97 controller");
1251MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");
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/io.h>
24
25#include <sound/core.h>
26#include <sound/initval.h>
27#include <sound/pcm.h>
28#include <sound/pcm_params.h>
29#include <sound/ac97_codec.h>
30#include <sound/atmel-ac97c.h>
31#include <sound/memalloc.h>
32
33#include <linux/dw_dmac.h>
34
35#include <mach/cpu.h>
36#include <mach/gpio.h>
37
38#ifdef CONFIG_ARCH_AT91
39#include <mach/hardware.h>
40#endif
41
42#include "ac97c.h"
43
44enum {
45 DMA_TX_READY = 0,
46 DMA_RX_READY,
47 DMA_TX_CHAN_PRESENT,
48 DMA_RX_CHAN_PRESENT,
49};
50
51/* Serialize access to opened variable */
52static DEFINE_MUTEX(opened_mutex);
53
54struct atmel_ac97c_dma {
55 struct dma_chan *rx_chan;
56 struct dma_chan *tx_chan;
57};
58
59struct atmel_ac97c {
60 struct clk *pclk;
61 struct platform_device *pdev;
62 struct atmel_ac97c_dma dma;
63
64 struct snd_pcm_substream *playback_substream;
65 struct snd_pcm_substream *capture_substream;
66 struct snd_card *card;
67 struct snd_pcm *pcm;
68 struct snd_ac97 *ac97;
69 struct snd_ac97_bus *ac97_bus;
70
71 u64 cur_format;
72 unsigned int cur_rate;
73 unsigned long flags;
74 int playback_period, capture_period;
75 /* Serialize access to opened variable */
76 spinlock_t lock;
77 void __iomem *regs;
78 int irq;
79 int opened;
80 int reset_pin;
81};
82
83#define get_chip(card) ((struct atmel_ac97c *)(card)->private_data)
84
85#define ac97c_writel(chip, reg, val) \
86 __raw_writel((val), (chip)->regs + AC97C_##reg)
87#define ac97c_readl(chip, reg) \
88 __raw_readl((chip)->regs + AC97C_##reg)
89
90/* This function is called by the DMA driver. */
91static void atmel_ac97c_dma_playback_period_done(void *arg)
92{
93 struct atmel_ac97c *chip = arg;
94 snd_pcm_period_elapsed(chip->playback_substream);
95}
96
97static void atmel_ac97c_dma_capture_period_done(void *arg)
98{
99 struct atmel_ac97c *chip = arg;
100 snd_pcm_period_elapsed(chip->capture_substream);
101}
102
103static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip,
104 struct snd_pcm_substream *substream,
105 enum dma_data_direction direction)
106{
107 struct dma_chan *chan;
108 struct dw_cyclic_desc *cdesc;
109 struct snd_pcm_runtime *runtime = substream->runtime;
110 unsigned long buffer_len, period_len;
111
112 /*
113 * We don't do DMA on "complex" transfers, i.e. with
114 * non-halfword-aligned buffers or lengths.
115 */
116 if (runtime->dma_addr & 1 || runtime->buffer_size & 1) {
117 dev_dbg(&chip->pdev->dev, "too complex transfer\n");
118 return -EINVAL;
119 }
120
121 if (direction == DMA_TO_DEVICE)
122 chan = chip->dma.tx_chan;
123 else
124 chan = chip->dma.rx_chan;
125
126 buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
127 period_len = frames_to_bytes(runtime, runtime->period_size);
128
129 cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len,
130 period_len, direction);
131 if (IS_ERR(cdesc)) {
132 dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n");
133 return PTR_ERR(cdesc);
134 }
135
136 if (direction == DMA_TO_DEVICE) {
137 cdesc->period_callback = atmel_ac97c_dma_playback_period_done;
138 set_bit(DMA_TX_READY, &chip->flags);
139 } else {
140 cdesc->period_callback = atmel_ac97c_dma_capture_period_done;
141 set_bit(DMA_RX_READY, &chip->flags);
142 }
143
144 cdesc->period_callback_param = chip;
145
146 return 0;
147}
148
149static struct snd_pcm_hardware atmel_ac97c_hw = {
150 .info = (SNDRV_PCM_INFO_MMAP
151 | SNDRV_PCM_INFO_MMAP_VALID
152 | SNDRV_PCM_INFO_INTERLEAVED
153 | SNDRV_PCM_INFO_BLOCK_TRANSFER
154 | SNDRV_PCM_INFO_JOINT_DUPLEX
155 | SNDRV_PCM_INFO_RESUME
156 | SNDRV_PCM_INFO_PAUSE),
157 .formats = (SNDRV_PCM_FMTBIT_S16_BE
158 | SNDRV_PCM_FMTBIT_S16_LE),
159 .rates = (SNDRV_PCM_RATE_CONTINUOUS),
160 .rate_min = 4000,
161 .rate_max = 48000,
162 .channels_min = 1,
163 .channels_max = 2,
164 .buffer_bytes_max = 2 * 2 * 64 * 2048,
165 .period_bytes_min = 4096,
166 .period_bytes_max = 4096,
167 .periods_min = 6,
168 .periods_max = 64,
169};
170
171static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream)
172{
173 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
174 struct snd_pcm_runtime *runtime = substream->runtime;
175
176 mutex_lock(&opened_mutex);
177 chip->opened++;
178 runtime->hw = atmel_ac97c_hw;
179 if (chip->cur_rate) {
180 runtime->hw.rate_min = chip->cur_rate;
181 runtime->hw.rate_max = chip->cur_rate;
182 }
183 if (chip->cur_format)
184 runtime->hw.formats = (1ULL << chip->cur_format);
185 mutex_unlock(&opened_mutex);
186 chip->playback_substream = substream;
187 return 0;
188}
189
190static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream)
191{
192 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
193 struct snd_pcm_runtime *runtime = substream->runtime;
194
195 mutex_lock(&opened_mutex);
196 chip->opened++;
197 runtime->hw = atmel_ac97c_hw;
198 if (chip->cur_rate) {
199 runtime->hw.rate_min = chip->cur_rate;
200 runtime->hw.rate_max = chip->cur_rate;
201 }
202 if (chip->cur_format)
203 runtime->hw.formats = (1ULL << chip->cur_format);
204 mutex_unlock(&opened_mutex);
205 chip->capture_substream = substream;
206 return 0;
207}
208
209static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream)
210{
211 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
212
213 mutex_lock(&opened_mutex);
214 chip->opened--;
215 if (!chip->opened) {
216 chip->cur_rate = 0;
217 chip->cur_format = 0;
218 }
219 mutex_unlock(&opened_mutex);
220
221 chip->playback_substream = NULL;
222
223 return 0;
224}
225
226static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream)
227{
228 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
229
230 mutex_lock(&opened_mutex);
231 chip->opened--;
232 if (!chip->opened) {
233 chip->cur_rate = 0;
234 chip->cur_format = 0;
235 }
236 mutex_unlock(&opened_mutex);
237
238 chip->capture_substream = NULL;
239
240 return 0;
241}
242
243static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream,
244 struct snd_pcm_hw_params *hw_params)
245{
246 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
247 int retval;
248
249 retval = snd_pcm_lib_malloc_pages(substream,
250 params_buffer_bytes(hw_params));
251 if (retval < 0)
252 return retval;
253 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
254 if (cpu_is_at32ap7000()) {
255 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
256 if (retval == 1)
257 if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
258 dw_dma_cyclic_free(chip->dma.tx_chan);
259 }
260 /* Set restrictions to params. */
261 mutex_lock(&opened_mutex);
262 chip->cur_rate = params_rate(hw_params);
263 chip->cur_format = params_format(hw_params);
264 mutex_unlock(&opened_mutex);
265
266 return retval;
267}
268
269static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream,
270 struct snd_pcm_hw_params *hw_params)
271{
272 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
273 int retval;
274
275 retval = snd_pcm_lib_malloc_pages(substream,
276 params_buffer_bytes(hw_params));
277 if (retval < 0)
278 return retval;
279 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
280 if (cpu_is_at32ap7000()) {
281 if (retval < 0)
282 return retval;
283 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
284 if (retval == 1)
285 if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
286 dw_dma_cyclic_free(chip->dma.rx_chan);
287 }
288
289 /* Set restrictions to params. */
290 mutex_lock(&opened_mutex);
291 chip->cur_rate = params_rate(hw_params);
292 chip->cur_format = params_format(hw_params);
293 mutex_unlock(&opened_mutex);
294
295 return retval;
296}
297
298static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream)
299{
300 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
301 if (cpu_is_at32ap7000()) {
302 if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
303 dw_dma_cyclic_free(chip->dma.tx_chan);
304 }
305 return snd_pcm_lib_free_pages(substream);
306}
307
308static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream)
309{
310 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
311 if (cpu_is_at32ap7000()) {
312 if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
313 dw_dma_cyclic_free(chip->dma.rx_chan);
314 }
315 return snd_pcm_lib_free_pages(substream);
316}
317
318static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
319{
320 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
321 struct snd_pcm_runtime *runtime = substream->runtime;
322 int block_size = frames_to_bytes(runtime, runtime->period_size);
323 unsigned long word = ac97c_readl(chip, OCA);
324 int retval;
325
326 chip->playback_period = 0;
327 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
328
329 /* assign channels to AC97C channel A */
330 switch (runtime->channels) {
331 case 1:
332 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
333 break;
334 case 2:
335 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
336 | AC97C_CH_ASSIGN(PCM_RIGHT, A);
337 break;
338 default:
339 /* TODO: support more than two channels */
340 return -EINVAL;
341 }
342 ac97c_writel(chip, OCA, word);
343
344 /* configure sample format and size */
345 word = ac97c_readl(chip, CAMR);
346 if (chip->opened <= 1)
347 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
348 else
349 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
350
351 switch (runtime->format) {
352 case SNDRV_PCM_FORMAT_S16_LE:
353 if (cpu_is_at32ap7000())
354 word |= AC97C_CMR_CEM_LITTLE;
355 break;
356 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
357 word &= ~(AC97C_CMR_CEM_LITTLE);
358 break;
359 default:
360 word = ac97c_readl(chip, OCA);
361 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
362 ac97c_writel(chip, OCA, word);
363 return -EINVAL;
364 }
365
366 /* Enable underrun interrupt on channel A */
367 word |= AC97C_CSR_UNRUN;
368
369 ac97c_writel(chip, CAMR, word);
370
371 /* Enable channel A event interrupt */
372 word = ac97c_readl(chip, IMR);
373 word |= AC97C_SR_CAEVT;
374 ac97c_writel(chip, IER, word);
375
376 /* set variable rate if needed */
377 if (runtime->rate != 48000) {
378 word = ac97c_readl(chip, MR);
379 word |= AC97C_MR_VRA;
380 ac97c_writel(chip, MR, word);
381 } else {
382 word = ac97c_readl(chip, MR);
383 word &= ~(AC97C_MR_VRA);
384 ac97c_writel(chip, MR, word);
385 }
386
387 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE,
388 runtime->rate);
389 if (retval)
390 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
391 runtime->rate);
392
393 if (cpu_is_at32ap7000()) {
394 if (!test_bit(DMA_TX_READY, &chip->flags))
395 retval = atmel_ac97c_prepare_dma(chip, substream,
396 DMA_TO_DEVICE);
397 } else {
398 /* Initialize and start the PDC */
399 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR);
400 writel(block_size / 2, chip->regs + ATMEL_PDC_TCR);
401 writel(runtime->dma_addr + block_size,
402 chip->regs + ATMEL_PDC_TNPR);
403 writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR);
404 }
405
406 return retval;
407}
408
409static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
410{
411 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
412 struct snd_pcm_runtime *runtime = substream->runtime;
413 int block_size = frames_to_bytes(runtime, runtime->period_size);
414 unsigned long word = ac97c_readl(chip, ICA);
415 int retval;
416
417 chip->capture_period = 0;
418 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
419
420 /* assign channels to AC97C channel A */
421 switch (runtime->channels) {
422 case 1:
423 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
424 break;
425 case 2:
426 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
427 | AC97C_CH_ASSIGN(PCM_RIGHT, A);
428 break;
429 default:
430 /* TODO: support more than two channels */
431 return -EINVAL;
432 }
433 ac97c_writel(chip, ICA, word);
434
435 /* configure sample format and size */
436 word = ac97c_readl(chip, CAMR);
437 if (chip->opened <= 1)
438 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
439 else
440 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
441
442 switch (runtime->format) {
443 case SNDRV_PCM_FORMAT_S16_LE:
444 if (cpu_is_at32ap7000())
445 word |= AC97C_CMR_CEM_LITTLE;
446 break;
447 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
448 word &= ~(AC97C_CMR_CEM_LITTLE);
449 break;
450 default:
451 word = ac97c_readl(chip, ICA);
452 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
453 ac97c_writel(chip, ICA, word);
454 return -EINVAL;
455 }
456
457 /* Enable overrun interrupt on channel A */
458 word |= AC97C_CSR_OVRUN;
459
460 ac97c_writel(chip, CAMR, word);
461
462 /* Enable channel A event interrupt */
463 word = ac97c_readl(chip, IMR);
464 word |= AC97C_SR_CAEVT;
465 ac97c_writel(chip, IER, word);
466
467 /* set variable rate if needed */
468 if (runtime->rate != 48000) {
469 word = ac97c_readl(chip, MR);
470 word |= AC97C_MR_VRA;
471 ac97c_writel(chip, MR, word);
472 } else {
473 word = ac97c_readl(chip, MR);
474 word &= ~(AC97C_MR_VRA);
475 ac97c_writel(chip, MR, word);
476 }
477
478 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE,
479 runtime->rate);
480 if (retval)
481 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
482 runtime->rate);
483
484 if (cpu_is_at32ap7000()) {
485 if (!test_bit(DMA_RX_READY, &chip->flags))
486 retval = atmel_ac97c_prepare_dma(chip, substream,
487 DMA_FROM_DEVICE);
488 } else {
489 /* Initialize and start the PDC */
490 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR);
491 writel(block_size / 2, chip->regs + ATMEL_PDC_RCR);
492 writel(runtime->dma_addr + block_size,
493 chip->regs + ATMEL_PDC_RNPR);
494 writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR);
495 }
496
497 return retval;
498}
499
500static int
501atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
502{
503 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
504 unsigned long camr, ptcr = 0;
505 int retval = 0;
506
507 camr = ac97c_readl(chip, CAMR);
508
509 switch (cmd) {
510 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
511 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
512 case SNDRV_PCM_TRIGGER_START:
513 if (cpu_is_at32ap7000()) {
514 retval = dw_dma_cyclic_start(chip->dma.tx_chan);
515 if (retval)
516 goto out;
517 } else {
518 ptcr = ATMEL_PDC_TXTEN;
519 }
520 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX;
521 break;
522 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
523 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
524 case SNDRV_PCM_TRIGGER_STOP:
525 if (cpu_is_at32ap7000())
526 dw_dma_cyclic_stop(chip->dma.tx_chan);
527 else
528 ptcr |= ATMEL_PDC_TXTDIS;
529 if (chip->opened <= 1)
530 camr &= ~AC97C_CMR_CENA;
531 break;
532 default:
533 retval = -EINVAL;
534 goto out;
535 }
536
537 ac97c_writel(chip, CAMR, camr);
538 if (!cpu_is_at32ap7000())
539 writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
540out:
541 return retval;
542}
543
544static int
545atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
546{
547 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
548 unsigned long camr, ptcr = 0;
549 int retval = 0;
550
551 camr = ac97c_readl(chip, CAMR);
552 ptcr = readl(chip->regs + ATMEL_PDC_PTSR);
553
554 switch (cmd) {
555 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
556 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
557 case SNDRV_PCM_TRIGGER_START:
558 if (cpu_is_at32ap7000()) {
559 retval = dw_dma_cyclic_start(chip->dma.rx_chan);
560 if (retval)
561 goto out;
562 } else {
563 ptcr = ATMEL_PDC_RXTEN;
564 }
565 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX;
566 break;
567 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
568 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
569 case SNDRV_PCM_TRIGGER_STOP:
570 if (cpu_is_at32ap7000())
571 dw_dma_cyclic_stop(chip->dma.rx_chan);
572 else
573 ptcr |= (ATMEL_PDC_RXTDIS);
574 if (chip->opened <= 1)
575 camr &= ~AC97C_CMR_CENA;
576 break;
577 default:
578 retval = -EINVAL;
579 break;
580 }
581
582 ac97c_writel(chip, CAMR, camr);
583 if (!cpu_is_at32ap7000())
584 writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
585out:
586 return retval;
587}
588
589static snd_pcm_uframes_t
590atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream)
591{
592 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
593 struct snd_pcm_runtime *runtime = substream->runtime;
594 snd_pcm_uframes_t frames;
595 unsigned long bytes;
596
597 if (cpu_is_at32ap7000())
598 bytes = dw_dma_get_src_addr(chip->dma.tx_chan);
599 else
600 bytes = readl(chip->regs + ATMEL_PDC_TPR);
601 bytes -= runtime->dma_addr;
602
603 frames = bytes_to_frames(runtime, bytes);
604 if (frames >= runtime->buffer_size)
605 frames -= runtime->buffer_size;
606 return frames;
607}
608
609static snd_pcm_uframes_t
610atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream)
611{
612 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
613 struct snd_pcm_runtime *runtime = substream->runtime;
614 snd_pcm_uframes_t frames;
615 unsigned long bytes;
616
617 if (cpu_is_at32ap7000())
618 bytes = dw_dma_get_dst_addr(chip->dma.rx_chan);
619 else
620 bytes = readl(chip->regs + ATMEL_PDC_RPR);
621 bytes -= runtime->dma_addr;
622
623 frames = bytes_to_frames(runtime, bytes);
624 if (frames >= runtime->buffer_size)
625 frames -= runtime->buffer_size;
626 return frames;
627}
628
629static struct snd_pcm_ops atmel_ac97_playback_ops = {
630 .open = atmel_ac97c_playback_open,
631 .close = atmel_ac97c_playback_close,
632 .ioctl = snd_pcm_lib_ioctl,
633 .hw_params = atmel_ac97c_playback_hw_params,
634 .hw_free = atmel_ac97c_playback_hw_free,
635 .prepare = atmel_ac97c_playback_prepare,
636 .trigger = atmel_ac97c_playback_trigger,
637 .pointer = atmel_ac97c_playback_pointer,
638};
639
640static struct snd_pcm_ops atmel_ac97_capture_ops = {
641 .open = atmel_ac97c_capture_open,
642 .close = atmel_ac97c_capture_close,
643 .ioctl = snd_pcm_lib_ioctl,
644 .hw_params = atmel_ac97c_capture_hw_params,
645 .hw_free = atmel_ac97c_capture_hw_free,
646 .prepare = atmel_ac97c_capture_prepare,
647 .trigger = atmel_ac97c_capture_trigger,
648 .pointer = atmel_ac97c_capture_pointer,
649};
650
651static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
652{
653 struct atmel_ac97c *chip = (struct atmel_ac97c *)dev;
654 irqreturn_t retval = IRQ_NONE;
655 u32 sr = ac97c_readl(chip, SR);
656 u32 casr = ac97c_readl(chip, CASR);
657 u32 cosr = ac97c_readl(chip, COSR);
658 u32 camr = ac97c_readl(chip, CAMR);
659
660 if (sr & AC97C_SR_CAEVT) {
661 struct snd_pcm_runtime *runtime;
662 int offset, next_period, block_size;
663 dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n",
664 casr & AC97C_CSR_OVRUN ? " OVRUN" : "",
665 casr & AC97C_CSR_RXRDY ? " RXRDY" : "",
666 casr & AC97C_CSR_UNRUN ? " UNRUN" : "",
667 casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
668 casr & AC97C_CSR_TXRDY ? " TXRDY" : "",
669 !casr ? " NONE" : "");
670 if (!cpu_is_at32ap7000()) {
671 if ((casr & camr) & AC97C_CSR_ENDTX) {
672 runtime = chip->playback_substream->runtime;
673 block_size = frames_to_bytes(runtime,
674 runtime->period_size);
675 chip->playback_period++;
676
677 if (chip->playback_period == runtime->periods)
678 chip->playback_period = 0;
679 next_period = chip->playback_period + 1;
680 if (next_period == runtime->periods)
681 next_period = 0;
682
683 offset = block_size * next_period;
684
685 writel(runtime->dma_addr + offset,
686 chip->regs + ATMEL_PDC_TNPR);
687 writel(block_size / 2,
688 chip->regs + ATMEL_PDC_TNCR);
689
690 snd_pcm_period_elapsed(
691 chip->playback_substream);
692 }
693 if ((casr & camr) & AC97C_CSR_ENDRX) {
694 runtime = chip->capture_substream->runtime;
695 block_size = frames_to_bytes(runtime,
696 runtime->period_size);
697 chip->capture_period++;
698
699 if (chip->capture_period == runtime->periods)
700 chip->capture_period = 0;
701 next_period = chip->capture_period + 1;
702 if (next_period == runtime->periods)
703 next_period = 0;
704
705 offset = block_size * next_period;
706
707 writel(runtime->dma_addr + offset,
708 chip->regs + ATMEL_PDC_RNPR);
709 writel(block_size / 2,
710 chip->regs + ATMEL_PDC_RNCR);
711 snd_pcm_period_elapsed(chip->capture_substream);
712 }
713 }
714 retval = IRQ_HANDLED;
715 }
716
717 if (sr & AC97C_SR_COEVT) {
718 dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n",
719 cosr & AC97C_CSR_OVRUN ? " OVRUN" : "",
720 cosr & AC97C_CSR_RXRDY ? " RXRDY" : "",
721 cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
722 cosr & AC97C_CSR_TXRDY ? " TXRDY" : "",
723 !cosr ? " NONE" : "");
724 retval = IRQ_HANDLED;
725 }
726
727 if (retval == IRQ_NONE) {
728 dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x "
729 "casr 0x%08x cosr 0x%08x\n", sr, casr, cosr);
730 }
731
732 return retval;
733}
734
735static struct ac97_pcm at91_ac97_pcm_defs[] __devinitdata = {
736 /* Playback */
737 {
738 .exclusive = 1,
739 .r = { {
740 .slots = ((1 << AC97_SLOT_PCM_LEFT)
741 | (1 << AC97_SLOT_PCM_RIGHT)),
742 } },
743 },
744 /* PCM in */
745 {
746 .stream = 1,
747 .exclusive = 1,
748 .r = { {
749 .slots = ((1 << AC97_SLOT_PCM_LEFT)
750 | (1 << AC97_SLOT_PCM_RIGHT)),
751 } }
752 },
753 /* Mic in */
754 {
755 .stream = 1,
756 .exclusive = 1,
757 .r = { {
758 .slots = (1<<AC97_SLOT_MIC),
759 } }
760 },
761};
762
763static int __devinit atmel_ac97c_pcm_new(struct atmel_ac97c *chip)
764{
765 struct snd_pcm *pcm;
766 struct snd_pcm_hardware hw = atmel_ac97c_hw;
767 int capture, playback, retval, err;
768
769 capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
770 playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
771
772 if (!cpu_is_at32ap7000()) {
773 err = snd_ac97_pcm_assign(chip->ac97_bus,
774 ARRAY_SIZE(at91_ac97_pcm_defs),
775 at91_ac97_pcm_defs);
776 if (err)
777 return err;
778 }
779 retval = snd_pcm_new(chip->card, chip->card->shortname,
780 chip->pdev->id, playback, capture, &pcm);
781 if (retval)
782 return retval;
783
784 if (capture)
785 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
786 &atmel_ac97_capture_ops);
787 if (playback)
788 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
789 &atmel_ac97_playback_ops);
790
791 retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
792 &chip->pdev->dev, hw.periods_min * hw.period_bytes_min,
793 hw.buffer_bytes_max);
794 if (retval)
795 return retval;
796
797 pcm->private_data = chip;
798 pcm->info_flags = 0;
799 strcpy(pcm->name, chip->card->shortname);
800 chip->pcm = pcm;
801
802 return 0;
803}
804
805static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip)
806{
807 struct snd_ac97_template template;
808 memset(&template, 0, sizeof(template));
809 template.private_data = chip;
810 return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97);
811}
812
813static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg,
814 unsigned short val)
815{
816 struct atmel_ac97c *chip = get_chip(ac97);
817 unsigned long word;
818 int timeout = 40;
819
820 word = (reg & 0x7f) << 16 | val;
821
822 do {
823 if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) {
824 ac97c_writel(chip, COTHR, word);
825 return;
826 }
827 udelay(1);
828 } while (--timeout);
829
830 dev_dbg(&chip->pdev->dev, "codec write timeout\n");
831}
832
833static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97,
834 unsigned short reg)
835{
836 struct atmel_ac97c *chip = get_chip(ac97);
837 unsigned long word;
838 int timeout = 40;
839 int write = 10;
840
841 word = (0x80 | (reg & 0x7f)) << 16;
842
843 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0)
844 ac97c_readl(chip, CORHR);
845
846retry_write:
847 timeout = 40;
848
849 do {
850 if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) {
851 ac97c_writel(chip, COTHR, word);
852 goto read_reg;
853 }
854 udelay(10);
855 } while (--timeout);
856
857 if (!--write)
858 goto timed_out;
859 goto retry_write;
860
861read_reg:
862 do {
863 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) {
864 unsigned short val = ac97c_readl(chip, CORHR);
865 return val;
866 }
867 udelay(10);
868 } while (--timeout);
869
870 if (!--write)
871 goto timed_out;
872 goto retry_write;
873
874timed_out:
875 dev_dbg(&chip->pdev->dev, "codec read timeout\n");
876 return 0xffff;
877}
878
879static bool filter(struct dma_chan *chan, void *slave)
880{
881 struct dw_dma_slave *dws = slave;
882
883 if (dws->dma_dev == chan->device->dev) {
884 chan->private = dws;
885 return true;
886 } else
887 return false;
888}
889
890static void atmel_ac97c_reset(struct atmel_ac97c *chip)
891{
892 ac97c_writel(chip, MR, 0);
893 ac97c_writel(chip, MR, AC97C_MR_ENA);
894 ac97c_writel(chip, CAMR, 0);
895 ac97c_writel(chip, COMR, 0);
896
897 if (gpio_is_valid(chip->reset_pin)) {
898 gpio_set_value(chip->reset_pin, 0);
899 /* AC97 v2.2 specifications says minimum 1 us. */
900 udelay(2);
901 gpio_set_value(chip->reset_pin, 1);
902 }
903}
904
905static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
906{
907 struct snd_card *card;
908 struct atmel_ac97c *chip;
909 struct resource *regs;
910 struct ac97c_platform_data *pdata;
911 struct clk *pclk;
912 static struct snd_ac97_bus_ops ops = {
913 .write = atmel_ac97c_write,
914 .read = atmel_ac97c_read,
915 };
916 int retval;
917 int irq;
918
919 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
920 if (!regs) {
921 dev_dbg(&pdev->dev, "no memory resource\n");
922 return -ENXIO;
923 }
924
925 pdata = pdev->dev.platform_data;
926 if (!pdata) {
927 dev_dbg(&pdev->dev, "no platform data\n");
928 return -ENXIO;
929 }
930
931 irq = platform_get_irq(pdev, 0);
932 if (irq < 0) {
933 dev_dbg(&pdev->dev, "could not get irq\n");
934 return -ENXIO;
935 }
936
937 if (cpu_is_at32ap7000()) {
938 pclk = clk_get(&pdev->dev, "pclk");
939 } else {
940 pclk = clk_get(&pdev->dev, "ac97_clk");
941 }
942
943 if (IS_ERR(pclk)) {
944 dev_dbg(&pdev->dev, "no peripheral clock\n");
945 return PTR_ERR(pclk);
946 }
947 clk_enable(pclk);
948
949 retval = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
950 THIS_MODULE, sizeof(struct atmel_ac97c), &card);
951 if (retval) {
952 dev_dbg(&pdev->dev, "could not create sound card device\n");
953 goto err_snd_card_new;
954 }
955
956 chip = get_chip(card);
957
958 retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip);
959 if (retval) {
960 dev_dbg(&pdev->dev, "unable to request irq %d\n", irq);
961 goto err_request_irq;
962 }
963 chip->irq = irq;
964
965 spin_lock_init(&chip->lock);
966
967 strcpy(card->driver, "Atmel AC97C");
968 strcpy(card->shortname, "Atmel AC97C");
969 sprintf(card->longname, "Atmel AC97 controller");
970
971 chip->card = card;
972 chip->pclk = pclk;
973 chip->pdev = pdev;
974 chip->regs = ioremap(regs->start, resource_size(regs));
975
976 if (!chip->regs) {
977 dev_dbg(&pdev->dev, "could not remap register memory\n");
978 goto err_ioremap;
979 }
980
981 if (gpio_is_valid(pdata->reset_pin)) {
982 if (gpio_request(pdata->reset_pin, "reset_pin")) {
983 dev_dbg(&pdev->dev, "reset pin not available\n");
984 chip->reset_pin = -ENODEV;
985 } else {
986 gpio_direction_output(pdata->reset_pin, 1);
987 chip->reset_pin = pdata->reset_pin;
988 }
989 }
990
991 snd_card_set_dev(card, &pdev->dev);
992
993 atmel_ac97c_reset(chip);
994
995 /* Enable overrun interrupt from codec channel */
996 ac97c_writel(chip, COMR, AC97C_CSR_OVRUN);
997 ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT);
998
999 retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus);
1000 if (retval) {
1001 dev_dbg(&pdev->dev, "could not register on ac97 bus\n");
1002 goto err_ac97_bus;
1003 }
1004
1005 retval = atmel_ac97c_mixer_new(chip);
1006 if (retval) {
1007 dev_dbg(&pdev->dev, "could not register ac97 mixer\n");
1008 goto err_ac97_bus;
1009 }
1010
1011 if (cpu_is_at32ap7000()) {
1012 if (pdata->rx_dws.dma_dev) {
1013 struct dw_dma_slave *dws = &pdata->rx_dws;
1014 dma_cap_mask_t mask;
1015
1016 dws->rx_reg = regs->start + AC97C_CARHR + 2;
1017
1018 dma_cap_zero(mask);
1019 dma_cap_set(DMA_SLAVE, mask);
1020
1021 chip->dma.rx_chan = dma_request_channel(mask, filter,
1022 dws);
1023
1024 dev_info(&chip->pdev->dev, "using %s for DMA RX\n",
1025 dev_name(&chip->dma.rx_chan->dev->device));
1026 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1027 }
1028
1029 if (pdata->tx_dws.dma_dev) {
1030 struct dw_dma_slave *dws = &pdata->tx_dws;
1031 dma_cap_mask_t mask;
1032
1033 dws->tx_reg = regs->start + AC97C_CATHR + 2;
1034
1035 dma_cap_zero(mask);
1036 dma_cap_set(DMA_SLAVE, mask);
1037
1038 chip->dma.tx_chan = dma_request_channel(mask, filter,
1039 dws);
1040
1041 dev_info(&chip->pdev->dev, "using %s for DMA TX\n",
1042 dev_name(&chip->dma.tx_chan->dev->device));
1043 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1044 }
1045
1046 if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) &&
1047 !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) {
1048 dev_dbg(&pdev->dev, "DMA not available\n");
1049 retval = -ENODEV;
1050 goto err_dma;
1051 }
1052 } else {
1053 /* Just pretend that we have DMA channel(for at91 i is actually
1054 * the PDC) */
1055 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1056 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1057 }
1058
1059 retval = atmel_ac97c_pcm_new(chip);
1060 if (retval) {
1061 dev_dbg(&pdev->dev, "could not register ac97 pcm device\n");
1062 goto err_dma;
1063 }
1064
1065 retval = snd_card_register(card);
1066 if (retval) {
1067 dev_dbg(&pdev->dev, "could not register sound card\n");
1068 goto err_dma;
1069 }
1070
1071 platform_set_drvdata(pdev, card);
1072
1073 dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n",
1074 chip->regs, irq);
1075
1076 return 0;
1077
1078err_dma:
1079 if (cpu_is_at32ap7000()) {
1080 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1081 dma_release_channel(chip->dma.rx_chan);
1082 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1083 dma_release_channel(chip->dma.tx_chan);
1084 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1085 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1086 chip->dma.rx_chan = NULL;
1087 chip->dma.tx_chan = NULL;
1088 }
1089err_ac97_bus:
1090 snd_card_set_dev(card, NULL);
1091
1092 if (gpio_is_valid(chip->reset_pin))
1093 gpio_free(chip->reset_pin);
1094
1095 iounmap(chip->regs);
1096err_ioremap:
1097 free_irq(irq, chip);
1098err_request_irq:
1099 snd_card_free(card);
1100err_snd_card_new:
1101 clk_disable(pclk);
1102 clk_put(pclk);
1103 return retval;
1104}
1105
1106#ifdef CONFIG_PM
1107static int atmel_ac97c_suspend(struct platform_device *pdev, pm_message_t msg)
1108{
1109 struct snd_card *card = platform_get_drvdata(pdev);
1110 struct atmel_ac97c *chip = card->private_data;
1111
1112 if (cpu_is_at32ap7000()) {
1113 if (test_bit(DMA_RX_READY, &chip->flags))
1114 dw_dma_cyclic_stop(chip->dma.rx_chan);
1115 if (test_bit(DMA_TX_READY, &chip->flags))
1116 dw_dma_cyclic_stop(chip->dma.tx_chan);
1117 }
1118 clk_disable(chip->pclk);
1119
1120 return 0;
1121}
1122
1123static int atmel_ac97c_resume(struct platform_device *pdev)
1124{
1125 struct snd_card *card = platform_get_drvdata(pdev);
1126 struct atmel_ac97c *chip = card->private_data;
1127
1128 clk_enable(chip->pclk);
1129 if (cpu_is_at32ap7000()) {
1130 if (test_bit(DMA_RX_READY, &chip->flags))
1131 dw_dma_cyclic_start(chip->dma.rx_chan);
1132 if (test_bit(DMA_TX_READY, &chip->flags))
1133 dw_dma_cyclic_start(chip->dma.tx_chan);
1134 }
1135 return 0;
1136}
1137#else
1138#define atmel_ac97c_suspend NULL
1139#define atmel_ac97c_resume NULL
1140#endif
1141
1142static int __devexit atmel_ac97c_remove(struct platform_device *pdev)
1143{
1144 struct snd_card *card = platform_get_drvdata(pdev);
1145 struct atmel_ac97c *chip = get_chip(card);
1146
1147 if (gpio_is_valid(chip->reset_pin))
1148 gpio_free(chip->reset_pin);
1149
1150 ac97c_writel(chip, CAMR, 0);
1151 ac97c_writel(chip, COMR, 0);
1152 ac97c_writel(chip, MR, 0);
1153
1154 clk_disable(chip->pclk);
1155 clk_put(chip->pclk);
1156 iounmap(chip->regs);
1157 free_irq(chip->irq, chip);
1158
1159 if (cpu_is_at32ap7000()) {
1160 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1161 dma_release_channel(chip->dma.rx_chan);
1162 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1163 dma_release_channel(chip->dma.tx_chan);
1164 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1165 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1166 chip->dma.rx_chan = NULL;
1167 chip->dma.tx_chan = NULL;
1168 }
1169
1170 snd_card_set_dev(card, NULL);
1171 snd_card_free(card);
1172
1173 platform_set_drvdata(pdev, NULL);
1174
1175 return 0;
1176}
1177
1178static struct platform_driver atmel_ac97c_driver = {
1179 .remove = __devexit_p(atmel_ac97c_remove),
1180 .driver = {
1181 .name = "atmel_ac97c",
1182 },
1183 .suspend = atmel_ac97c_suspend,
1184 .resume = atmel_ac97c_resume,
1185};
1186
1187static int __init atmel_ac97c_init(void)
1188{
1189 return platform_driver_probe(&atmel_ac97c_driver,
1190 atmel_ac97c_probe);
1191}
1192module_init(atmel_ac97c_init);
1193
1194static void __exit atmel_ac97c_exit(void)
1195{
1196 platform_driver_unregister(&atmel_ac97c_driver);
1197}
1198module_exit(atmel_ac97c_exit);
1199
1200MODULE_LICENSE("GPL");
1201MODULE_DESCRIPTION("Driver for Atmel AC97 controller");
1202MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");