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dm thin: wake worker when discard is prepared
[linux-2.6.git] / sound / atmel / ac97c.c
blob9052aff37f6460fcdaba020f0b44d85484243c96
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
26 #include <sound/core.h>
27 #include <sound/initval.h>
28 #include <sound/pcm.h>
29 #include <sound/pcm_params.h>
30 #include <sound/ac97_codec.h>
31 #include <sound/atmel-ac97c.h>
32 #include <sound/memalloc.h>
33
34 #include <linux/dw_dmac.h>
35
36 #include <mach/cpu.h>
37 #include <mach/gpio.h>
38
39 #ifdef CONFIG_ARCH_AT91
40 #include <mach/hardware.h>
41 #endif
42
43 #include "ac97c.h"
44
45 enum {
46 DMA_TX_READY = 0,
47 DMA_RX_READY,
48 DMA_TX_CHAN_PRESENT,
49 DMA_RX_CHAN_PRESENT,
50 };
51
52 /* Serialize access to opened variable */
53 static DEFINE_MUTEX(opened_mutex);
54
55 struct atmel_ac97c_dma {
56 struct dma_chan *rx_chan;
57 struct dma_chan *tx_chan;
58 };
59
60 struct atmel_ac97c {
61 struct clk *pclk;
62 struct platform_device *pdev;
63 struct atmel_ac97c_dma dma;
64
65 struct snd_pcm_substream *playback_substream;
66 struct snd_pcm_substream *capture_substream;
67 struct snd_card *card;
68 struct snd_pcm *pcm;
69 struct snd_ac97 *ac97;
70 struct snd_ac97_bus *ac97_bus;
71
72 u64 cur_format;
73 unsigned int cur_rate;
74 unsigned long flags;
75 int playback_period, capture_period;
76 /* Serialize access to opened variable */
77 spinlock_t lock;
78 void __iomem *regs;
79 int irq;
80 int opened;
81 int reset_pin;
82 };
83
84 #define get_chip(card) ((struct atmel_ac97c *)(card)->private_data)
85
86 #define ac97c_writel(chip, reg, val) \
87 __raw_writel((val), (chip)->regs + AC97C_##reg)
88 #define ac97c_readl(chip, reg) \
89 __raw_readl((chip)->regs + AC97C_##reg)
90
91 /* This function is called by the DMA driver. */
92 static void atmel_ac97c_dma_playback_period_done(void *arg)
93 {
94 struct atmel_ac97c *chip = arg;
95 snd_pcm_period_elapsed(chip->playback_substream);
96 }
97
98 static void atmel_ac97c_dma_capture_period_done(void *arg)
99 {
100 struct atmel_ac97c *chip = arg;
101 snd_pcm_period_elapsed(chip->capture_substream);
102 }
103
104 static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip,
105 struct snd_pcm_substream *substream,
106 enum dma_transfer_direction direction)
107 {
108 struct dma_chan *chan;
109 struct dw_cyclic_desc *cdesc;
110 struct snd_pcm_runtime *runtime = substream->runtime;
111 unsigned long buffer_len, period_len;
112
113 /*
114 * We don't do DMA on "complex" transfers, i.e. with
115 * non-halfword-aligned buffers or lengths.
116 */
117 if (runtime->dma_addr & 1 || runtime->buffer_size & 1) {
118 dev_dbg(&chip->pdev->dev, "too complex transfer\n");
119 return -EINVAL;
120 }
121
122 if (direction == DMA_MEM_TO_DEV)
123 chan = chip->dma.tx_chan;
124 else
125 chan = chip->dma.rx_chan;
126
127 buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
128 period_len = frames_to_bytes(runtime, runtime->period_size);
129
130 cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len,
131 period_len, direction);
132 if (IS_ERR(cdesc)) {
133 dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n");
134 return PTR_ERR(cdesc);
135 }
136
137 if (direction == DMA_MEM_TO_DEV) {
138 cdesc->period_callback = atmel_ac97c_dma_playback_period_done;
139 set_bit(DMA_TX_READY, &chip->flags);
140 } else {
141 cdesc->period_callback = atmel_ac97c_dma_capture_period_done;
142 set_bit(DMA_RX_READY, &chip->flags);
143 }
144
145 cdesc->period_callback_param = chip;
146
147 return 0;
148 }
149
150 static struct snd_pcm_hardware atmel_ac97c_hw = {
151 .info = (SNDRV_PCM_INFO_MMAP
152 | SNDRV_PCM_INFO_MMAP_VALID
153 | SNDRV_PCM_INFO_INTERLEAVED
154 | SNDRV_PCM_INFO_BLOCK_TRANSFER
155 | SNDRV_PCM_INFO_JOINT_DUPLEX
156 | SNDRV_PCM_INFO_RESUME
157 | SNDRV_PCM_INFO_PAUSE),
158 .formats = (SNDRV_PCM_FMTBIT_S16_BE
159 | SNDRV_PCM_FMTBIT_S16_LE),
160 .rates = (SNDRV_PCM_RATE_CONTINUOUS),
161 .rate_min = 4000,
162 .rate_max = 48000,
163 .channels_min = 1,
164 .channels_max = 2,
165 .buffer_bytes_max = 2 * 2 * 64 * 2048,
166 .period_bytes_min = 4096,
167 .period_bytes_max = 4096,
168 .periods_min = 6,
169 .periods_max = 64,
170 };
171
172 static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream)
173 {
174 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
175 struct snd_pcm_runtime *runtime = substream->runtime;
176
177 mutex_lock(&opened_mutex);
178 chip->opened++;
179 runtime->hw = atmel_ac97c_hw;
180 if (chip->cur_rate) {
181 runtime->hw.rate_min = chip->cur_rate;
182 runtime->hw.rate_max = chip->cur_rate;
183 }
184 if (chip->cur_format)
185 runtime->hw.formats = (1ULL << chip->cur_format);
186 mutex_unlock(&opened_mutex);
187 chip->playback_substream = substream;
188 return 0;
189 }
190
191 static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream)
192 {
193 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
194 struct snd_pcm_runtime *runtime = substream->runtime;
195
196 mutex_lock(&opened_mutex);
197 chip->opened++;
198 runtime->hw = atmel_ac97c_hw;
199 if (chip->cur_rate) {
200 runtime->hw.rate_min = chip->cur_rate;
201 runtime->hw.rate_max = chip->cur_rate;
202 }
203 if (chip->cur_format)
204 runtime->hw.formats = (1ULL << chip->cur_format);
205 mutex_unlock(&opened_mutex);
206 chip->capture_substream = substream;
207 return 0;
208 }
209
210 static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream)
211 {
212 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
213
214 mutex_lock(&opened_mutex);
215 chip->opened--;
216 if (!chip->opened) {
217 chip->cur_rate = 0;
218 chip->cur_format = 0;
219 }
220 mutex_unlock(&opened_mutex);
221
222 chip->playback_substream = NULL;
223
224 return 0;
225 }
226
227 static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream)
228 {
229 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
230
231 mutex_lock(&opened_mutex);
232 chip->opened--;
233 if (!chip->opened) {
234 chip->cur_rate = 0;
235 chip->cur_format = 0;
236 }
237 mutex_unlock(&opened_mutex);
238
239 chip->capture_substream = NULL;
240
241 return 0;
242 }
243
244 static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream,
245 struct snd_pcm_hw_params *hw_params)
246 {
247 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
248 int retval;
249
250 retval = snd_pcm_lib_malloc_pages(substream,
251 params_buffer_bytes(hw_params));
252 if (retval < 0)
253 return retval;
254 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
255 if (cpu_is_at32ap7000()) {
256 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
257 if (retval == 1)
258 if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
259 dw_dma_cyclic_free(chip->dma.tx_chan);
260 }
261 /* Set restrictions to params. */
262 mutex_lock(&opened_mutex);
263 chip->cur_rate = params_rate(hw_params);
264 chip->cur_format = params_format(hw_params);
265 mutex_unlock(&opened_mutex);
266
267 return retval;
268 }
269
270 static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream,
271 struct snd_pcm_hw_params *hw_params)
272 {
273 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
274 int retval;
275
276 retval = snd_pcm_lib_malloc_pages(substream,
277 params_buffer_bytes(hw_params));
278 if (retval < 0)
279 return retval;
280 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
281 if (cpu_is_at32ap7000() && retval == 1)
282 if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
283 dw_dma_cyclic_free(chip->dma.rx_chan);
284
285 /* Set restrictions to params. */
286 mutex_lock(&opened_mutex);
287 chip->cur_rate = params_rate(hw_params);
288 chip->cur_format = params_format(hw_params);
289 mutex_unlock(&opened_mutex);
290
291 return retval;
292 }
293
294 static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream)
295 {
296 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
297 if (cpu_is_at32ap7000()) {
298 if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
299 dw_dma_cyclic_free(chip->dma.tx_chan);
300 }
301 return snd_pcm_lib_free_pages(substream);
302 }
303
304 static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream)
305 {
306 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
307 if (cpu_is_at32ap7000()) {
308 if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
309 dw_dma_cyclic_free(chip->dma.rx_chan);
310 }
311 return snd_pcm_lib_free_pages(substream);
312 }
313
314 static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
315 {
316 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
317 struct snd_pcm_runtime *runtime = substream->runtime;
318 int block_size = frames_to_bytes(runtime, runtime->period_size);
319 unsigned long word = ac97c_readl(chip, OCA);
320 int retval;
321
322 chip->playback_period = 0;
323 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
324
325 /* assign channels to AC97C channel A */
326 switch (runtime->channels) {
327 case 1:
328 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
329 break;
330 case 2:
331 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
332 | AC97C_CH_ASSIGN(PCM_RIGHT, A);
333 break;
334 default:
335 /* TODO: support more than two channels */
336 return -EINVAL;
337 }
338 ac97c_writel(chip, OCA, word);
339
340 /* configure sample format and size */
341 word = ac97c_readl(chip, CAMR);
342 if (chip->opened <= 1)
343 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
344 else
345 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
346
347 switch (runtime->format) {
348 case SNDRV_PCM_FORMAT_S16_LE:
349 if (cpu_is_at32ap7000())
350 word |= AC97C_CMR_CEM_LITTLE;
351 break;
352 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
353 word &= ~(AC97C_CMR_CEM_LITTLE);
354 break;
355 default:
356 word = ac97c_readl(chip, OCA);
357 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
358 ac97c_writel(chip, OCA, word);
359 return -EINVAL;
360 }
361
362 /* Enable underrun interrupt on channel A */
363 word |= AC97C_CSR_UNRUN;
364
365 ac97c_writel(chip, CAMR, word);
366
367 /* Enable channel A event interrupt */
368 word = ac97c_readl(chip, IMR);
369 word |= AC97C_SR_CAEVT;
370 ac97c_writel(chip, IER, word);
371
372 /* set variable rate if needed */
373 if (runtime->rate != 48000) {
374 word = ac97c_readl(chip, MR);
375 word |= AC97C_MR_VRA;
376 ac97c_writel(chip, MR, word);
377 } else {
378 word = ac97c_readl(chip, MR);
379 word &= ~(AC97C_MR_VRA);
380 ac97c_writel(chip, MR, word);
381 }
382
383 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE,
384 runtime->rate);
385 if (retval)
386 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
387 runtime->rate);
388
389 if (cpu_is_at32ap7000()) {
390 if (!test_bit(DMA_TX_READY, &chip->flags))
391 retval = atmel_ac97c_prepare_dma(chip, substream,
392 DMA_MEM_TO_DEV);
393 } else {
394 /* Initialize and start the PDC */
395 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR);
396 writel(block_size / 2, chip->regs + ATMEL_PDC_TCR);
397 writel(runtime->dma_addr + block_size,
398 chip->regs + ATMEL_PDC_TNPR);
399 writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR);
400 }
401
402 return retval;
403 }
404
405 static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
406 {
407 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
408 struct snd_pcm_runtime *runtime = substream->runtime;
409 int block_size = frames_to_bytes(runtime, runtime->period_size);
410 unsigned long word = ac97c_readl(chip, ICA);
411 int retval;
412
413 chip->capture_period = 0;
414 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
415
416 /* assign channels to AC97C channel A */
417 switch (runtime->channels) {
418 case 1:
419 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
420 break;
421 case 2:
422 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
423 | AC97C_CH_ASSIGN(PCM_RIGHT, A);
424 break;
425 default:
426 /* TODO: support more than two channels */
427 return -EINVAL;
428 }
429 ac97c_writel(chip, ICA, word);
430
431 /* configure sample format and size */
432 word = ac97c_readl(chip, CAMR);
433 if (chip->opened <= 1)
434 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
435 else
436 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
437
438 switch (runtime->format) {
439 case SNDRV_PCM_FORMAT_S16_LE:
440 if (cpu_is_at32ap7000())
441 word |= AC97C_CMR_CEM_LITTLE;
442 break;
443 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
444 word &= ~(AC97C_CMR_CEM_LITTLE);
445 break;
446 default:
447 word = ac97c_readl(chip, ICA);
448 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
449 ac97c_writel(chip, ICA, word);
450 return -EINVAL;
451 }
452
453 /* Enable overrun interrupt on channel A */
454 word |= AC97C_CSR_OVRUN;
455
456 ac97c_writel(chip, CAMR, word);
457
458 /* Enable channel A event interrupt */
459 word = ac97c_readl(chip, IMR);
460 word |= AC97C_SR_CAEVT;
461 ac97c_writel(chip, IER, word);
462
463 /* set variable rate if needed */
464 if (runtime->rate != 48000) {
465 word = ac97c_readl(chip, MR);
466 word |= AC97C_MR_VRA;
467 ac97c_writel(chip, MR, word);
468 } else {
469 word = ac97c_readl(chip, MR);
470 word &= ~(AC97C_MR_VRA);
471 ac97c_writel(chip, MR, word);
472 }
473
474 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE,
475 runtime->rate);
476 if (retval)
477 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
478 runtime->rate);
479
480 if (cpu_is_at32ap7000()) {
481 if (!test_bit(DMA_RX_READY, &chip->flags))
482 retval = atmel_ac97c_prepare_dma(chip, substream,
483 DMA_DEV_TO_MEM);
484 } else {
485 /* Initialize and start the PDC */
486 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR);
487 writel(block_size / 2, chip->regs + ATMEL_PDC_RCR);
488 writel(runtime->dma_addr + block_size,
489 chip->regs + ATMEL_PDC_RNPR);
490 writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR);
491 }
492
493 return retval;
494 }
495
496 static int
497 atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
498 {
499 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
500 unsigned long camr, ptcr = 0;
501 int retval = 0;
502
503 camr = ac97c_readl(chip, CAMR);
504
505 switch (cmd) {
506 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
507 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
508 case SNDRV_PCM_TRIGGER_START:
509 if (cpu_is_at32ap7000()) {
510 retval = dw_dma_cyclic_start(chip->dma.tx_chan);
511 if (retval)
512 goto out;
513 } else {
514 ptcr = ATMEL_PDC_TXTEN;
515 }
516 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX;
517 break;
518 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
519 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
520 case SNDRV_PCM_TRIGGER_STOP:
521 if (cpu_is_at32ap7000())
522 dw_dma_cyclic_stop(chip->dma.tx_chan);
523 else
524 ptcr |= ATMEL_PDC_TXTDIS;
525 if (chip->opened <= 1)
526 camr &= ~AC97C_CMR_CENA;
527 break;
528 default:
529 retval = -EINVAL;
530 goto out;
531 }
532
533 ac97c_writel(chip, CAMR, camr);
534 if (!cpu_is_at32ap7000())
535 writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
536 out:
537 return retval;
538 }
539
540 static int
541 atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
542 {
543 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
544 unsigned long camr, ptcr = 0;
545 int retval = 0;
546
547 camr = ac97c_readl(chip, CAMR);
548 ptcr = readl(chip->regs + ATMEL_PDC_PTSR);
549
550 switch (cmd) {
551 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
552 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
553 case SNDRV_PCM_TRIGGER_START:
554 if (cpu_is_at32ap7000()) {
555 retval = dw_dma_cyclic_start(chip->dma.rx_chan);
556 if (retval)
557 goto out;
558 } else {
559 ptcr = ATMEL_PDC_RXTEN;
560 }
561 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX;
562 break;
563 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
564 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
565 case SNDRV_PCM_TRIGGER_STOP:
566 if (cpu_is_at32ap7000())
567 dw_dma_cyclic_stop(chip->dma.rx_chan);
568 else
569 ptcr |= (ATMEL_PDC_RXTDIS);
570 if (chip->opened <= 1)
571 camr &= ~AC97C_CMR_CENA;
572 break;
573 default:
574 retval = -EINVAL;
575 break;
576 }
577
578 ac97c_writel(chip, CAMR, camr);
579 if (!cpu_is_at32ap7000())
580 writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
581 out:
582 return retval;
583 }
584
585 static snd_pcm_uframes_t
586 atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream)
587 {
588 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
589 struct snd_pcm_runtime *runtime = substream->runtime;
590 snd_pcm_uframes_t frames;
591 unsigned long bytes;
592
593 if (cpu_is_at32ap7000())
594 bytes = dw_dma_get_src_addr(chip->dma.tx_chan);
595 else
596 bytes = readl(chip->regs + ATMEL_PDC_TPR);
597 bytes -= runtime->dma_addr;
598
599 frames = bytes_to_frames(runtime, bytes);
600 if (frames >= runtime->buffer_size)
601 frames -= runtime->buffer_size;
602 return frames;
603 }
604
605 static snd_pcm_uframes_t
606 atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream)
607 {
608 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
609 struct snd_pcm_runtime *runtime = substream->runtime;
610 snd_pcm_uframes_t frames;
611 unsigned long bytes;
612
613 if (cpu_is_at32ap7000())
614 bytes = dw_dma_get_dst_addr(chip->dma.rx_chan);
615 else
616 bytes = readl(chip->regs + ATMEL_PDC_RPR);
617 bytes -= runtime->dma_addr;
618
619 frames = bytes_to_frames(runtime, bytes);
620 if (frames >= runtime->buffer_size)
621 frames -= runtime->buffer_size;
622 return frames;
623 }
624
625 static struct snd_pcm_ops atmel_ac97_playback_ops = {
626 .open = atmel_ac97c_playback_open,
627 .close = atmel_ac97c_playback_close,
628 .ioctl = snd_pcm_lib_ioctl,
629 .hw_params = atmel_ac97c_playback_hw_params,
630 .hw_free = atmel_ac97c_playback_hw_free,
631 .prepare = atmel_ac97c_playback_prepare,
632 .trigger = atmel_ac97c_playback_trigger,
633 .pointer = atmel_ac97c_playback_pointer,
634 };
635
636 static struct snd_pcm_ops atmel_ac97_capture_ops = {
637 .open = atmel_ac97c_capture_open,
638 .close = atmel_ac97c_capture_close,
639 .ioctl = snd_pcm_lib_ioctl,
640 .hw_params = atmel_ac97c_capture_hw_params,
641 .hw_free = atmel_ac97c_capture_hw_free,
642 .prepare = atmel_ac97c_capture_prepare,
643 .trigger = atmel_ac97c_capture_trigger,
644 .pointer = atmel_ac97c_capture_pointer,
645 };
646
647 static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
648 {
649 struct atmel_ac97c *chip = (struct atmel_ac97c *)dev;
650 irqreturn_t retval = IRQ_NONE;
651 u32 sr = ac97c_readl(chip, SR);
652 u32 casr = ac97c_readl(chip, CASR);
653 u32 cosr = ac97c_readl(chip, COSR);
654 u32 camr = ac97c_readl(chip, CAMR);
655
656 if (sr & AC97C_SR_CAEVT) {
657 struct snd_pcm_runtime *runtime;
658 int offset, next_period, block_size;
659 dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n",
660 casr & AC97C_CSR_OVRUN ? " OVRUN" : "",
661 casr & AC97C_CSR_RXRDY ? " RXRDY" : "",
662 casr & AC97C_CSR_UNRUN ? " UNRUN" : "",
663 casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
664 casr & AC97C_CSR_TXRDY ? " TXRDY" : "",
665 !casr ? " NONE" : "");
666 if (!cpu_is_at32ap7000()) {
667 if ((casr & camr) & AC97C_CSR_ENDTX) {
668 runtime = chip->playback_substream->runtime;
669 block_size = frames_to_bytes(runtime,
670 runtime->period_size);
671 chip->playback_period++;
672
673 if (chip->playback_period == runtime->periods)
674 chip->playback_period = 0;
675 next_period = chip->playback_period + 1;
676 if (next_period == runtime->periods)
677 next_period = 0;
678
679 offset = block_size * next_period;
680
681 writel(runtime->dma_addr + offset,
682 chip->regs + ATMEL_PDC_TNPR);
683 writel(block_size / 2,
684 chip->regs + ATMEL_PDC_TNCR);
685
686 snd_pcm_period_elapsed(
687 chip->playback_substream);
688 }
689 if ((casr & camr) & AC97C_CSR_ENDRX) {
690 runtime = chip->capture_substream->runtime;
691 block_size = frames_to_bytes(runtime,
692 runtime->period_size);
693 chip->capture_period++;
694
695 if (chip->capture_period == runtime->periods)
696 chip->capture_period = 0;
697 next_period = chip->capture_period + 1;
698 if (next_period == runtime->periods)
699 next_period = 0;
700
701 offset = block_size * next_period;
702
703 writel(runtime->dma_addr + offset,
704 chip->regs + ATMEL_PDC_RNPR);
705 writel(block_size / 2,
706 chip->regs + ATMEL_PDC_RNCR);
707 snd_pcm_period_elapsed(chip->capture_substream);
708 }
709 }
710 retval = IRQ_HANDLED;
711 }
712
713 if (sr & AC97C_SR_COEVT) {
714 dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n",
715 cosr & AC97C_CSR_OVRUN ? " OVRUN" : "",
716 cosr & AC97C_CSR_RXRDY ? " RXRDY" : "",
717 cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
718 cosr & AC97C_CSR_TXRDY ? " TXRDY" : "",
719 !cosr ? " NONE" : "");
720 retval = IRQ_HANDLED;
721 }
722
723 if (retval == IRQ_NONE) {
724 dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x "
725 "casr 0x%08x cosr 0x%08x\n", sr, casr, cosr);
726 }
727
728 return retval;
729 }
730
731 static struct ac97_pcm at91_ac97_pcm_defs[] __devinitdata = {
732 /* Playback */
733 {
734 .exclusive = 1,
735 .r = { {
736 .slots = ((1 << AC97_SLOT_PCM_LEFT)
737 | (1 << AC97_SLOT_PCM_RIGHT)),
738 } },
739 },
740 /* PCM in */
741 {
742 .stream = 1,
743 .exclusive = 1,
744 .r = { {
745 .slots = ((1 << AC97_SLOT_PCM_LEFT)
746 | (1 << AC97_SLOT_PCM_RIGHT)),
747 } }
748 },
749 /* Mic in */
750 {
751 .stream = 1,
752 .exclusive = 1,
753 .r = { {
754 .slots = (1<<AC97_SLOT_MIC),
755 } }
756 },
757 };
758
759 static int __devinit atmel_ac97c_pcm_new(struct atmel_ac97c *chip)
760 {
761 struct snd_pcm *pcm;
762 struct snd_pcm_hardware hw = atmel_ac97c_hw;
763 int capture, playback, retval, err;
764
765 capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
766 playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
767
768 if (!cpu_is_at32ap7000()) {
769 err = snd_ac97_pcm_assign(chip->ac97_bus,
770 ARRAY_SIZE(at91_ac97_pcm_defs),
771 at91_ac97_pcm_defs);
772 if (err)
773 return err;
774 }
775 retval = snd_pcm_new(chip->card, chip->card->shortname,
776 chip->pdev->id, playback, capture, &pcm);
777 if (retval)
778 return retval;
779
780 if (capture)
781 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
782 &atmel_ac97_capture_ops);
783 if (playback)
784 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
785 &atmel_ac97_playback_ops);
786
787 retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
788 &chip->pdev->dev, hw.periods_min * hw.period_bytes_min,
789 hw.buffer_bytes_max);
790 if (retval)
791 return retval;
792
793 pcm->private_data = chip;
794 pcm->info_flags = 0;
795 strcpy(pcm->name, chip->card->shortname);
796 chip->pcm = pcm;
797
798 return 0;
799 }
800
801 static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip)
802 {
803 struct snd_ac97_template template;
804 memset(&template, 0, sizeof(template));
805 template.private_data = chip;
806 return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97);
807 }
808
809 static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg,
810 unsigned short val)
811 {
812 struct atmel_ac97c *chip = get_chip(ac97);
813 unsigned long word;
814 int timeout = 40;
815
816 word = (reg & 0x7f) << 16 | val;
817
818 do {
819 if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) {
820 ac97c_writel(chip, COTHR, word);
821 return;
822 }
823 udelay(1);
824 } while (--timeout);
825
826 dev_dbg(&chip->pdev->dev, "codec write timeout\n");
827 }
828
829 static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97,
830 unsigned short reg)
831 {
832 struct atmel_ac97c *chip = get_chip(ac97);
833 unsigned long word;
834 int timeout = 40;
835 int write = 10;
836
837 word = (0x80 | (reg & 0x7f)) << 16;
838
839 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0)
840 ac97c_readl(chip, CORHR);
841
842 retry_write:
843 timeout = 40;
844
845 do {
846 if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) {
847 ac97c_writel(chip, COTHR, word);
848 goto read_reg;
849 }
850 udelay(10);
851 } while (--timeout);
852
853 if (!--write)
854 goto timed_out;
855 goto retry_write;
856
857 read_reg:
858 do {
859 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) {
860 unsigned short val = ac97c_readl(chip, CORHR);
861 return val;
862 }
863 udelay(10);
864 } while (--timeout);
865
866 if (!--write)
867 goto timed_out;
868 goto retry_write;
869
870 timed_out:
871 dev_dbg(&chip->pdev->dev, "codec read timeout\n");
872 return 0xffff;
873 }
874
875 static bool filter(struct dma_chan *chan, void *slave)
876 {
877 struct dw_dma_slave *dws = slave;
878
879 if (dws->dma_dev == chan->device->dev) {
880 chan->private = dws;
881 return true;
882 } else
883 return false;
884 }
885
886 static void atmel_ac97c_reset(struct atmel_ac97c *chip)
887 {
888 ac97c_writel(chip, MR, 0);
889 ac97c_writel(chip, MR, AC97C_MR_ENA);
890 ac97c_writel(chip, CAMR, 0);
891 ac97c_writel(chip, COMR, 0);
892
893 if (gpio_is_valid(chip->reset_pin)) {
894 gpio_set_value(chip->reset_pin, 0);
895 /* AC97 v2.2 specifications says minimum 1 us. */
896 udelay(2);
897 gpio_set_value(chip->reset_pin, 1);
898 } else {
899 ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA);
900 udelay(2);
901 ac97c_writel(chip, MR, AC97C_MR_ENA);
902 }
903 }
904
905 static 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 retval = -ENOMEM;
979 goto err_ioremap;
980 }
981
982 if (gpio_is_valid(pdata->reset_pin)) {
983 if (gpio_request(pdata->reset_pin, "reset_pin")) {
984 dev_dbg(&pdev->dev, "reset pin not available\n");
985 chip->reset_pin = -ENODEV;
986 } else {
987 gpio_direction_output(pdata->reset_pin, 1);
988 chip->reset_pin = pdata->reset_pin;
989 }
990 } else {
991 chip->reset_pin = -EINVAL;
992 }
993
994 snd_card_set_dev(card, &pdev->dev);
995
996 atmel_ac97c_reset(chip);
997
998 /* Enable overrun interrupt from codec channel */
999 ac97c_writel(chip, COMR, AC97C_CSR_OVRUN);
1000 ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT);
1001
1002 retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus);
1003 if (retval) {
1004 dev_dbg(&pdev->dev, "could not register on ac97 bus\n");
1005 goto err_ac97_bus;
1006 }
1007
1008 retval = atmel_ac97c_mixer_new(chip);
1009 if (retval) {
1010 dev_dbg(&pdev->dev, "could not register ac97 mixer\n");
1011 goto err_ac97_bus;
1012 }
1013
1014 if (cpu_is_at32ap7000()) {
1015 if (pdata->rx_dws.dma_dev) {
1016 dma_cap_mask_t mask;
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 &pdata->rx_dws);
1023 if (chip->dma.rx_chan) {
1024 struct dma_slave_config dma_conf = {
1025 .src_addr = regs->start + AC97C_CARHR +
1026 2,
1027 .src_addr_width =
1028 DMA_SLAVE_BUSWIDTH_2_BYTES,
1029 .src_maxburst = 1,
1030 .dst_maxburst = 1,
1031 .direction = DMA_DEV_TO_MEM,
1032 .device_fc = false,
1033 };
1034
1035 dmaengine_slave_config(chip->dma.rx_chan,
1036 &dma_conf);
1037 }
1038
1039 dev_info(&chip->pdev->dev, "using %s for DMA RX\n",
1040 dev_name(&chip->dma.rx_chan->dev->device));
1041 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1042 }
1043
1044 if (pdata->tx_dws.dma_dev) {
1045 dma_cap_mask_t mask;
1046
1047 dma_cap_zero(mask);
1048 dma_cap_set(DMA_SLAVE, mask);
1049
1050 chip->dma.tx_chan = dma_request_channel(mask, filter,
1051 &pdata->tx_dws);
1052 if (chip->dma.tx_chan) {
1053 struct dma_slave_config dma_conf = {
1054 .dst_addr = regs->start + AC97C_CATHR +
1055 2,
1056 .dst_addr_width =
1057 DMA_SLAVE_BUSWIDTH_2_BYTES,
1058 .src_maxburst = 1,
1059 .dst_maxburst = 1,
1060 .direction = DMA_MEM_TO_DEV,
1061 .device_fc = false,
1062 };
1063
1064 dmaengine_slave_config(chip->dma.tx_chan,
1065 &dma_conf);
1066 }
1067
1068 dev_info(&chip->pdev->dev, "using %s for DMA TX\n",
1069 dev_name(&chip->dma.tx_chan->dev->device));
1070 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1071 }
1072
1073 if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) &&
1074 !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) {
1075 dev_dbg(&pdev->dev, "DMA not available\n");
1076 retval = -ENODEV;
1077 goto err_dma;
1078 }
1079 } else {
1080 /* Just pretend that we have DMA channel(for at91 i is actually
1081 * the PDC) */
1082 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1083 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1084 }
1085
1086 retval = atmel_ac97c_pcm_new(chip);
1087 if (retval) {
1088 dev_dbg(&pdev->dev, "could not register ac97 pcm device\n");
1089 goto err_dma;
1090 }
1091
1092 retval = snd_card_register(card);
1093 if (retval) {
1094 dev_dbg(&pdev->dev, "could not register sound card\n");
1095 goto err_dma;
1096 }
1097
1098 platform_set_drvdata(pdev, card);
1099
1100 dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n",
1101 chip->regs, irq);
1102
1103 return 0;
1104
1105 err_dma:
1106 if (cpu_is_at32ap7000()) {
1107 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1108 dma_release_channel(chip->dma.rx_chan);
1109 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1110 dma_release_channel(chip->dma.tx_chan);
1111 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1112 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1113 chip->dma.rx_chan = NULL;
1114 chip->dma.tx_chan = NULL;
1115 }
1116 err_ac97_bus:
1117 snd_card_set_dev(card, NULL);
1118
1119 if (gpio_is_valid(chip->reset_pin))
1120 gpio_free(chip->reset_pin);
1121
1122 iounmap(chip->regs);
1123 err_ioremap:
1124 free_irq(irq, chip);
1125 err_request_irq:
1126 snd_card_free(card);
1127 err_snd_card_new:
1128 clk_disable(pclk);
1129 clk_put(pclk);
1130 return retval;
1131 }
1132
1133 #ifdef CONFIG_PM_SLEEP
1134 static int atmel_ac97c_suspend(struct device *pdev)
1135 {
1136 struct snd_card *card = dev_get_drvdata(pdev);
1137 struct atmel_ac97c *chip = card->private_data;
1138
1139 if (cpu_is_at32ap7000()) {
1140 if (test_bit(DMA_RX_READY, &chip->flags))
1141 dw_dma_cyclic_stop(chip->dma.rx_chan);
1142 if (test_bit(DMA_TX_READY, &chip->flags))
1143 dw_dma_cyclic_stop(chip->dma.tx_chan);
1144 }
1145 clk_disable(chip->pclk);
1146
1147 return 0;
1148 }
1149
1150 static int atmel_ac97c_resume(struct device *pdev)
1151 {
1152 struct snd_card *card = dev_get_drvdata(pdev);
1153 struct atmel_ac97c *chip = card->private_data;
1154
1155 clk_enable(chip->pclk);
1156 if (cpu_is_at32ap7000()) {
1157 if (test_bit(DMA_RX_READY, &chip->flags))
1158 dw_dma_cyclic_start(chip->dma.rx_chan);
1159 if (test_bit(DMA_TX_READY, &chip->flags))
1160 dw_dma_cyclic_start(chip->dma.tx_chan);
1161 }
1162 return 0;
1163 }
1164
1165 static SIMPLE_DEV_PM_OPS(atmel_ac97c_pm, atmel_ac97c_suspend, atmel_ac97c_resume);
1166 #define ATMEL_AC97C_PM_OPS &atmel_ac97c_pm
1167 #else
1168 #define ATMEL_AC97C_PM_OPS NULL
1169 #endif
1170
1171 static int __devexit atmel_ac97c_remove(struct platform_device *pdev)
1172 {
1173 struct snd_card *card = platform_get_drvdata(pdev);
1174 struct atmel_ac97c *chip = get_chip(card);
1175
1176 if (gpio_is_valid(chip->reset_pin))
1177 gpio_free(chip->reset_pin);
1178
1179 ac97c_writel(chip, CAMR, 0);
1180 ac97c_writel(chip, COMR, 0);
1181 ac97c_writel(chip, MR, 0);
1182
1183 clk_disable(chip->pclk);
1184 clk_put(chip->pclk);
1185 iounmap(chip->regs);
1186 free_irq(chip->irq, chip);
1187
1188 if (cpu_is_at32ap7000()) {
1189 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1190 dma_release_channel(chip->dma.rx_chan);
1191 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1192 dma_release_channel(chip->dma.tx_chan);
1193 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1194 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1195 chip->dma.rx_chan = NULL;
1196 chip->dma.tx_chan = NULL;
1197 }
1198
1199 snd_card_set_dev(card, NULL);
1200 snd_card_free(card);
1201
1202 platform_set_drvdata(pdev, NULL);
1203
1204 return 0;
1205 }
1206
1207 static struct platform_driver atmel_ac97c_driver = {
1208 .remove = __devexit_p(atmel_ac97c_remove),
1209 .driver = {
1210 .name = "atmel_ac97c",
1211 .owner = THIS_MODULE,
1212 .pm = ATMEL_AC97C_PM_OPS,
1213 },
1214 };
1215
1216 static int __init atmel_ac97c_init(void)
1217 {
1218 return platform_driver_probe(&atmel_ac97c_driver,
1219 atmel_ac97c_probe);
1220 }
1221 module_init(atmel_ac97c_init);
1222
1223 static void __exit atmel_ac97c_exit(void)
1224 {
1225 platform_driver_unregister(&atmel_ac97c_driver);
1226 }
1227 module_exit(atmel_ac97c_exit);
1228
1229 MODULE_LICENSE("GPL");
1230 MODULE_DESCRIPTION("Driver for Atmel AC97 controller");
1231 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");
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