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Merge tag 'gpio-v3.13-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
[linux-2.6.git] / sound / atmel / ac97c.c
blobc5f0ddd729b35a5ea0292b3c7a9347cb8aa04271
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
38 #ifdef CONFIG_ARCH_AT91
39 #include <mach/hardware.h>
40 #endif
41
42 #include "ac97c.h"
43
44 enum {
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 */
52 static DEFINE_MUTEX(opened_mutex);
53
54 struct atmel_ac97c_dma {
55 struct dma_chan *rx_chan;
56 struct dma_chan *tx_chan;
57 };
58
59 struct 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. */
91 static 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
97 static 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
103 static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip,
104 struct snd_pcm_substream *substream,
105 enum dma_transfer_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_MEM_TO_DEV)
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_MEM_TO_DEV) {
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
149 static 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
171 static 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 = pcm_format_to_bits(chip->cur_format);
185 mutex_unlock(&opened_mutex);
186 chip->playback_substream = substream;
187 return 0;
188 }
189
190 static 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 = pcm_format_to_bits(chip->cur_format);
204 mutex_unlock(&opened_mutex);
205 chip->capture_substream = substream;
206 return 0;
207 }
208
209 static 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
226 static 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
243 static 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
269 static 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() && retval == 1)
281 if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
282 dw_dma_cyclic_free(chip->dma.rx_chan);
283
284 /* Set restrictions to params. */
285 mutex_lock(&opened_mutex);
286 chip->cur_rate = params_rate(hw_params);
287 chip->cur_format = params_format(hw_params);
288 mutex_unlock(&opened_mutex);
289
290 return retval;
291 }
292
293 static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream)
294 {
295 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
296 if (cpu_is_at32ap7000()) {
297 if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
298 dw_dma_cyclic_free(chip->dma.tx_chan);
299 }
300 return snd_pcm_lib_free_pages(substream);
301 }
302
303 static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream)
304 {
305 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
306 if (cpu_is_at32ap7000()) {
307 if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
308 dw_dma_cyclic_free(chip->dma.rx_chan);
309 }
310 return snd_pcm_lib_free_pages(substream);
311 }
312
313 static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
314 {
315 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
316 struct snd_pcm_runtime *runtime = substream->runtime;
317 int block_size = frames_to_bytes(runtime, runtime->period_size);
318 unsigned long word = ac97c_readl(chip, OCA);
319 int retval;
320
321 chip->playback_period = 0;
322 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
323
324 /* assign channels to AC97C channel A */
325 switch (runtime->channels) {
326 case 1:
327 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
328 break;
329 case 2:
330 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
331 | AC97C_CH_ASSIGN(PCM_RIGHT, A);
332 break;
333 default:
334 /* TODO: support more than two channels */
335 return -EINVAL;
336 }
337 ac97c_writel(chip, OCA, word);
338
339 /* configure sample format and size */
340 word = ac97c_readl(chip, CAMR);
341 if (chip->opened <= 1)
342 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
343 else
344 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
345
346 switch (runtime->format) {
347 case SNDRV_PCM_FORMAT_S16_LE:
348 if (cpu_is_at32ap7000())
349 word |= AC97C_CMR_CEM_LITTLE;
350 break;
351 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
352 word &= ~(AC97C_CMR_CEM_LITTLE);
353 break;
354 default:
355 word = ac97c_readl(chip, OCA);
356 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
357 ac97c_writel(chip, OCA, word);
358 return -EINVAL;
359 }
360
361 /* Enable underrun interrupt on channel A */
362 word |= AC97C_CSR_UNRUN;
363
364 ac97c_writel(chip, CAMR, word);
365
366 /* Enable channel A event interrupt */
367 word = ac97c_readl(chip, IMR);
368 word |= AC97C_SR_CAEVT;
369 ac97c_writel(chip, IER, word);
370
371 /* set variable rate if needed */
372 if (runtime->rate != 48000) {
373 word = ac97c_readl(chip, MR);
374 word |= AC97C_MR_VRA;
375 ac97c_writel(chip, MR, word);
376 } else {
377 word = ac97c_readl(chip, MR);
378 word &= ~(AC97C_MR_VRA);
379 ac97c_writel(chip, MR, word);
380 }
381
382 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE,
383 runtime->rate);
384 if (retval)
385 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
386 runtime->rate);
387
388 if (cpu_is_at32ap7000()) {
389 if (!test_bit(DMA_TX_READY, &chip->flags))
390 retval = atmel_ac97c_prepare_dma(chip, substream,
391 DMA_MEM_TO_DEV);
392 } else {
393 /* Initialize and start the PDC */
394 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR);
395 writel(block_size / 2, chip->regs + ATMEL_PDC_TCR);
396 writel(runtime->dma_addr + block_size,
397 chip->regs + ATMEL_PDC_TNPR);
398 writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR);
399 }
400
401 return retval;
402 }
403
404 static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
405 {
406 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
407 struct snd_pcm_runtime *runtime = substream->runtime;
408 int block_size = frames_to_bytes(runtime, runtime->period_size);
409 unsigned long word = ac97c_readl(chip, ICA);
410 int retval;
411
412 chip->capture_period = 0;
413 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
414
415 /* assign channels to AC97C channel A */
416 switch (runtime->channels) {
417 case 1:
418 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
419 break;
420 case 2:
421 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
422 | AC97C_CH_ASSIGN(PCM_RIGHT, A);
423 break;
424 default:
425 /* TODO: support more than two channels */
426 return -EINVAL;
427 }
428 ac97c_writel(chip, ICA, word);
429
430 /* configure sample format and size */
431 word = ac97c_readl(chip, CAMR);
432 if (chip->opened <= 1)
433 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
434 else
435 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
436
437 switch (runtime->format) {
438 case SNDRV_PCM_FORMAT_S16_LE:
439 if (cpu_is_at32ap7000())
440 word |= AC97C_CMR_CEM_LITTLE;
441 break;
442 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
443 word &= ~(AC97C_CMR_CEM_LITTLE);
444 break;
445 default:
446 word = ac97c_readl(chip, ICA);
447 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
448 ac97c_writel(chip, ICA, word);
449 return -EINVAL;
450 }
451
452 /* Enable overrun interrupt on channel A */
453 word |= AC97C_CSR_OVRUN;
454
455 ac97c_writel(chip, CAMR, word);
456
457 /* Enable channel A event interrupt */
458 word = ac97c_readl(chip, IMR);
459 word |= AC97C_SR_CAEVT;
460 ac97c_writel(chip, IER, word);
461
462 /* set variable rate if needed */
463 if (runtime->rate != 48000) {
464 word = ac97c_readl(chip, MR);
465 word |= AC97C_MR_VRA;
466 ac97c_writel(chip, MR, word);
467 } else {
468 word = ac97c_readl(chip, MR);
469 word &= ~(AC97C_MR_VRA);
470 ac97c_writel(chip, MR, word);
471 }
472
473 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE,
474 runtime->rate);
475 if (retval)
476 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
477 runtime->rate);
478
479 if (cpu_is_at32ap7000()) {
480 if (!test_bit(DMA_RX_READY, &chip->flags))
481 retval = atmel_ac97c_prepare_dma(chip, substream,
482 DMA_DEV_TO_MEM);
483 } else {
484 /* Initialize and start the PDC */
485 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR);
486 writel(block_size / 2, chip->regs + ATMEL_PDC_RCR);
487 writel(runtime->dma_addr + block_size,
488 chip->regs + ATMEL_PDC_RNPR);
489 writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR);
490 }
491
492 return retval;
493 }
494
495 static int
496 atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
497 {
498 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
499 unsigned long camr, ptcr = 0;
500 int retval = 0;
501
502 camr = ac97c_readl(chip, CAMR);
503
504 switch (cmd) {
505 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
506 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
507 case SNDRV_PCM_TRIGGER_START:
508 if (cpu_is_at32ap7000()) {
509 retval = dw_dma_cyclic_start(chip->dma.tx_chan);
510 if (retval)
511 goto out;
512 } else {
513 ptcr = ATMEL_PDC_TXTEN;
514 }
515 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX;
516 break;
517 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
518 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
519 case SNDRV_PCM_TRIGGER_STOP:
520 if (cpu_is_at32ap7000())
521 dw_dma_cyclic_stop(chip->dma.tx_chan);
522 else
523 ptcr |= ATMEL_PDC_TXTDIS;
524 if (chip->opened <= 1)
525 camr &= ~AC97C_CMR_CENA;
526 break;
527 default:
528 retval = -EINVAL;
529 goto out;
530 }
531
532 ac97c_writel(chip, CAMR, camr);
533 if (!cpu_is_at32ap7000())
534 writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
535 out:
536 return retval;
537 }
538
539 static int
540 atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
541 {
542 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
543 unsigned long camr, ptcr = 0;
544 int retval = 0;
545
546 camr = ac97c_readl(chip, CAMR);
547 ptcr = readl(chip->regs + ATMEL_PDC_PTSR);
548
549 switch (cmd) {
550 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
551 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
552 case SNDRV_PCM_TRIGGER_START:
553 if (cpu_is_at32ap7000()) {
554 retval = dw_dma_cyclic_start(chip->dma.rx_chan);
555 if (retval)
556 goto out;
557 } else {
558 ptcr = ATMEL_PDC_RXTEN;
559 }
560 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX;
561 break;
562 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
563 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
564 case SNDRV_PCM_TRIGGER_STOP:
565 if (cpu_is_at32ap7000())
566 dw_dma_cyclic_stop(chip->dma.rx_chan);
567 else
568 ptcr |= (ATMEL_PDC_RXTDIS);
569 if (chip->opened <= 1)
570 camr &= ~AC97C_CMR_CENA;
571 break;
572 default:
573 retval = -EINVAL;
574 break;
575 }
576
577 ac97c_writel(chip, CAMR, camr);
578 if (!cpu_is_at32ap7000())
579 writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
580 out:
581 return retval;
582 }
583
584 static snd_pcm_uframes_t
585 atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream)
586 {
587 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
588 struct snd_pcm_runtime *runtime = substream->runtime;
589 snd_pcm_uframes_t frames;
590 unsigned long bytes;
591
592 if (cpu_is_at32ap7000())
593 bytes = dw_dma_get_src_addr(chip->dma.tx_chan);
594 else
595 bytes = readl(chip->regs + ATMEL_PDC_TPR);
596 bytes -= runtime->dma_addr;
597
598 frames = bytes_to_frames(runtime, bytes);
599 if (frames >= runtime->buffer_size)
600 frames -= runtime->buffer_size;
601 return frames;
602 }
603
604 static snd_pcm_uframes_t
605 atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream)
606 {
607 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
608 struct snd_pcm_runtime *runtime = substream->runtime;
609 snd_pcm_uframes_t frames;
610 unsigned long bytes;
611
612 if (cpu_is_at32ap7000())
613 bytes = dw_dma_get_dst_addr(chip->dma.rx_chan);
614 else
615 bytes = readl(chip->regs + ATMEL_PDC_RPR);
616 bytes -= runtime->dma_addr;
617
618 frames = bytes_to_frames(runtime, bytes);
619 if (frames >= runtime->buffer_size)
620 frames -= runtime->buffer_size;
621 return frames;
622 }
623
624 static struct snd_pcm_ops atmel_ac97_playback_ops = {
625 .open = atmel_ac97c_playback_open,
626 .close = atmel_ac97c_playback_close,
627 .ioctl = snd_pcm_lib_ioctl,
628 .hw_params = atmel_ac97c_playback_hw_params,
629 .hw_free = atmel_ac97c_playback_hw_free,
630 .prepare = atmel_ac97c_playback_prepare,
631 .trigger = atmel_ac97c_playback_trigger,
632 .pointer = atmel_ac97c_playback_pointer,
633 };
634
635 static struct snd_pcm_ops atmel_ac97_capture_ops = {
636 .open = atmel_ac97c_capture_open,
637 .close = atmel_ac97c_capture_close,
638 .ioctl = snd_pcm_lib_ioctl,
639 .hw_params = atmel_ac97c_capture_hw_params,
640 .hw_free = atmel_ac97c_capture_hw_free,
641 .prepare = atmel_ac97c_capture_prepare,
642 .trigger = atmel_ac97c_capture_trigger,
643 .pointer = atmel_ac97c_capture_pointer,
644 };
645
646 static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
647 {
648 struct atmel_ac97c *chip = (struct atmel_ac97c *)dev;
649 irqreturn_t retval = IRQ_NONE;
650 u32 sr = ac97c_readl(chip, SR);
651 u32 casr = ac97c_readl(chip, CASR);
652 u32 cosr = ac97c_readl(chip, COSR);
653 u32 camr = ac97c_readl(chip, CAMR);
654
655 if (sr & AC97C_SR_CAEVT) {
656 struct snd_pcm_runtime *runtime;
657 int offset, next_period, block_size;
658 dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n",
659 casr & AC97C_CSR_OVRUN ? " OVRUN" : "",
660 casr & AC97C_CSR_RXRDY ? " RXRDY" : "",
661 casr & AC97C_CSR_UNRUN ? " UNRUN" : "",
662 casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
663 casr & AC97C_CSR_TXRDY ? " TXRDY" : "",
664 !casr ? " NONE" : "");
665 if (!cpu_is_at32ap7000()) {
666 if ((casr & camr) & AC97C_CSR_ENDTX) {
667 runtime = chip->playback_substream->runtime;
668 block_size = frames_to_bytes(runtime,
669 runtime->period_size);
670 chip->playback_period++;
671
672 if (chip->playback_period == runtime->periods)
673 chip->playback_period = 0;
674 next_period = chip->playback_period + 1;
675 if (next_period == runtime->periods)
676 next_period = 0;
677
678 offset = block_size * next_period;
679
680 writel(runtime->dma_addr + offset,
681 chip->regs + ATMEL_PDC_TNPR);
682 writel(block_size / 2,
683 chip->regs + ATMEL_PDC_TNCR);
684
685 snd_pcm_period_elapsed(
686 chip->playback_substream);
687 }
688 if ((casr & camr) & AC97C_CSR_ENDRX) {
689 runtime = chip->capture_substream->runtime;
690 block_size = frames_to_bytes(runtime,
691 runtime->period_size);
692 chip->capture_period++;
693
694 if (chip->capture_period == runtime->periods)
695 chip->capture_period = 0;
696 next_period = chip->capture_period + 1;
697 if (next_period == runtime->periods)
698 next_period = 0;
699
700 offset = block_size * next_period;
701
702 writel(runtime->dma_addr + offset,
703 chip->regs + ATMEL_PDC_RNPR);
704 writel(block_size / 2,
705 chip->regs + ATMEL_PDC_RNCR);
706 snd_pcm_period_elapsed(chip->capture_substream);
707 }
708 }
709 retval = IRQ_HANDLED;
710 }
711
712 if (sr & AC97C_SR_COEVT) {
713 dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n",
714 cosr & AC97C_CSR_OVRUN ? " OVRUN" : "",
715 cosr & AC97C_CSR_RXRDY ? " RXRDY" : "",
716 cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
717 cosr & AC97C_CSR_TXRDY ? " TXRDY" : "",
718 !cosr ? " NONE" : "");
719 retval = IRQ_HANDLED;
720 }
721
722 if (retval == IRQ_NONE) {
723 dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x "
724 "casr 0x%08x cosr 0x%08x\n", sr, casr, cosr);
725 }
726
727 return retval;
728 }
729
730 static struct ac97_pcm at91_ac97_pcm_defs[] = {
731 /* Playback */
732 {
733 .exclusive = 1,
734 .r = { {
735 .slots = ((1 << AC97_SLOT_PCM_LEFT)
736 | (1 << AC97_SLOT_PCM_RIGHT)),
737 } },
738 },
739 /* PCM in */
740 {
741 .stream = 1,
742 .exclusive = 1,
743 .r = { {
744 .slots = ((1 << AC97_SLOT_PCM_LEFT)
745 | (1 << AC97_SLOT_PCM_RIGHT)),
746 } }
747 },
748 /* Mic in */
749 {
750 .stream = 1,
751 .exclusive = 1,
752 .r = { {
753 .slots = (1<<AC97_SLOT_MIC),
754 } }
755 },
756 };
757
758 static int atmel_ac97c_pcm_new(struct atmel_ac97c *chip)
759 {
760 struct snd_pcm *pcm;
761 struct snd_pcm_hardware hw = atmel_ac97c_hw;
762 int capture, playback, retval, err;
763
764 capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
765 playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
766
767 if (!cpu_is_at32ap7000()) {
768 err = snd_ac97_pcm_assign(chip->ac97_bus,
769 ARRAY_SIZE(at91_ac97_pcm_defs),
770 at91_ac97_pcm_defs);
771 if (err)
772 return err;
773 }
774 retval = snd_pcm_new(chip->card, chip->card->shortname,
775 chip->pdev->id, playback, capture, &pcm);
776 if (retval)
777 return retval;
778
779 if (capture)
780 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
781 &atmel_ac97_capture_ops);
782 if (playback)
783 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
784 &atmel_ac97_playback_ops);
785
786 retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
787 &chip->pdev->dev, hw.periods_min * hw.period_bytes_min,
788 hw.buffer_bytes_max);
789 if (retval)
790 return retval;
791
792 pcm->private_data = chip;
793 pcm->info_flags = 0;
794 strcpy(pcm->name, chip->card->shortname);
795 chip->pcm = pcm;
796
797 return 0;
798 }
799
800 static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip)
801 {
802 struct snd_ac97_template template;
803 memset(&template, 0, sizeof(template));
804 template.private_data = chip;
805 return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97);
806 }
807
808 static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg,
809 unsigned short val)
810 {
811 struct atmel_ac97c *chip = get_chip(ac97);
812 unsigned long word;
813 int timeout = 40;
814
815 word = (reg & 0x7f) << 16 | val;
816
817 do {
818 if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) {
819 ac97c_writel(chip, COTHR, word);
820 return;
821 }
822 udelay(1);
823 } while (--timeout);
824
825 dev_dbg(&chip->pdev->dev, "codec write timeout\n");
826 }
827
828 static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97,
829 unsigned short reg)
830 {
831 struct atmel_ac97c *chip = get_chip(ac97);
832 unsigned long word;
833 int timeout = 40;
834 int write = 10;
835
836 word = (0x80 | (reg & 0x7f)) << 16;
837
838 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0)
839 ac97c_readl(chip, CORHR);
840
841 retry_write:
842 timeout = 40;
843
844 do {
845 if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) {
846 ac97c_writel(chip, COTHR, word);
847 goto read_reg;
848 }
849 udelay(10);
850 } while (--timeout);
851
852 if (!--write)
853 goto timed_out;
854 goto retry_write;
855
856 read_reg:
857 do {
858 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) {
859 unsigned short val = ac97c_readl(chip, CORHR);
860 return val;
861 }
862 udelay(10);
863 } while (--timeout);
864
865 if (!--write)
866 goto timed_out;
867 goto retry_write;
868
869 timed_out:
870 dev_dbg(&chip->pdev->dev, "codec read timeout\n");
871 return 0xffff;
872 }
873
874 static bool filter(struct dma_chan *chan, void *slave)
875 {
876 struct dw_dma_slave *dws = slave;
877
878 if (dws->dma_dev == chan->device->dev) {
879 chan->private = dws;
880 return true;
881 } else
882 return false;
883 }
884
885 static void atmel_ac97c_reset(struct atmel_ac97c *chip)
886 {
887 ac97c_writel(chip, MR, 0);
888 ac97c_writel(chip, MR, AC97C_MR_ENA);
889 ac97c_writel(chip, CAMR, 0);
890 ac97c_writel(chip, COMR, 0);
891
892 if (gpio_is_valid(chip->reset_pin)) {
893 gpio_set_value(chip->reset_pin, 0);
894 /* AC97 v2.2 specifications says minimum 1 us. */
895 udelay(2);
896 gpio_set_value(chip->reset_pin, 1);
897 } else {
898 ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA);
899 udelay(2);
900 ac97c_writel(chip, MR, AC97C_MR_ENA);
901 }
902 }
903
904 static int atmel_ac97c_probe(struct platform_device *pdev)
905 {
906 struct snd_card *card;
907 struct atmel_ac97c *chip;
908 struct resource *regs;
909 struct ac97c_platform_data *pdata;
910 struct clk *pclk;
911 static struct snd_ac97_bus_ops ops = {
912 .write = atmel_ac97c_write,
913 .read = atmel_ac97c_read,
914 };
915 int retval;
916 int irq;
917
918 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
919 if (!regs) {
920 dev_dbg(&pdev->dev, "no memory resource\n");
921 return -ENXIO;
922 }
923
924 pdata = pdev->dev.platform_data;
925 if (!pdata) {
926 dev_dbg(&pdev->dev, "no platform data\n");
927 return -ENXIO;
928 }
929
930 irq = platform_get_irq(pdev, 0);
931 if (irq < 0) {
932 dev_dbg(&pdev->dev, "could not get irq\n");
933 return -ENXIO;
934 }
935
936 if (cpu_is_at32ap7000()) {
937 pclk = clk_get(&pdev->dev, "pclk");
938 } else {
939 pclk = clk_get(&pdev->dev, "ac97_clk");
940 }
941
942 if (IS_ERR(pclk)) {
943 dev_dbg(&pdev->dev, "no peripheral clock\n");
944 return PTR_ERR(pclk);
945 }
946 clk_enable(pclk);
947
948 retval = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
949 THIS_MODULE, sizeof(struct atmel_ac97c), &card);
950 if (retval) {
951 dev_dbg(&pdev->dev, "could not create sound card device\n");
952 goto err_snd_card_new;
953 }
954
955 chip = get_chip(card);
956
957 retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip);
958 if (retval) {
959 dev_dbg(&pdev->dev, "unable to request irq %d\n", irq);
960 goto err_request_irq;
961 }
962 chip->irq = irq;
963
964 spin_lock_init(&chip->lock);
965
966 strcpy(card->driver, "Atmel AC97C");
967 strcpy(card->shortname, "Atmel AC97C");
968 sprintf(card->longname, "Atmel AC97 controller");
969
970 chip->card = card;
971 chip->pclk = pclk;
972 chip->pdev = pdev;
973 chip->regs = ioremap(regs->start, resource_size(regs));
974
975 if (!chip->regs) {
976 dev_dbg(&pdev->dev, "could not remap register memory\n");
977 retval = -ENOMEM;
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 } else {
990 chip->reset_pin = -EINVAL;
991 }
992
993 snd_card_set_dev(card, &pdev->dev);
994
995 atmel_ac97c_reset(chip);
996
997 /* Enable overrun interrupt from codec channel */
998 ac97c_writel(chip, COMR, AC97C_CSR_OVRUN);
999 ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT);
1000
1001 retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus);
1002 if (retval) {
1003 dev_dbg(&pdev->dev, "could not register on ac97 bus\n");
1004 goto err_ac97_bus;
1005 }
1006
1007 retval = atmel_ac97c_mixer_new(chip);
1008 if (retval) {
1009 dev_dbg(&pdev->dev, "could not register ac97 mixer\n");
1010 goto err_ac97_bus;
1011 }
1012
1013 if (cpu_is_at32ap7000()) {
1014 if (pdata->rx_dws.dma_dev) {
1015 dma_cap_mask_t mask;
1016
1017 dma_cap_zero(mask);
1018 dma_cap_set(DMA_SLAVE, mask);
1019
1020 chip->dma.rx_chan = dma_request_channel(mask, filter,
1021 &pdata->rx_dws);
1022 if (chip->dma.rx_chan) {
1023 struct dma_slave_config dma_conf = {
1024 .src_addr = regs->start + AC97C_CARHR +
1025 2,
1026 .src_addr_width =
1027 DMA_SLAVE_BUSWIDTH_2_BYTES,
1028 .src_maxburst = 1,
1029 .dst_maxburst = 1,
1030 .direction = DMA_DEV_TO_MEM,
1031 .device_fc = false,
1032 };
1033
1034 dmaengine_slave_config(chip->dma.rx_chan,
1035 &dma_conf);
1036 }
1037
1038 dev_info(&chip->pdev->dev, "using %s for DMA RX\n",
1039 dev_name(&chip->dma.rx_chan->dev->device));
1040 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1041 }
1042
1043 if (pdata->tx_dws.dma_dev) {
1044 dma_cap_mask_t mask;
1045
1046 dma_cap_zero(mask);
1047 dma_cap_set(DMA_SLAVE, mask);
1048
1049 chip->dma.tx_chan = dma_request_channel(mask, filter,
1050 &pdata->tx_dws);
1051 if (chip->dma.tx_chan) {
1052 struct dma_slave_config dma_conf = {
1053 .dst_addr = regs->start + AC97C_CATHR +
1054 2,
1055 .dst_addr_width =
1056 DMA_SLAVE_BUSWIDTH_2_BYTES,
1057 .src_maxburst = 1,
1058 .dst_maxburst = 1,
1059 .direction = DMA_MEM_TO_DEV,
1060 .device_fc = false,
1061 };
1062
1063 dmaengine_slave_config(chip->dma.tx_chan,
1064 &dma_conf);
1065 }
1066
1067 dev_info(&chip->pdev->dev, "using %s for DMA TX\n",
1068 dev_name(&chip->dma.tx_chan->dev->device));
1069 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1070 }
1071
1072 if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) &&
1073 !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) {
1074 dev_dbg(&pdev->dev, "DMA not available\n");
1075 retval = -ENODEV;
1076 goto err_dma;
1077 }
1078 } else {
1079 /* Just pretend that we have DMA channel(for at91 i is actually
1080 * the PDC) */
1081 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1082 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1083 }
1084
1085 retval = atmel_ac97c_pcm_new(chip);
1086 if (retval) {
1087 dev_dbg(&pdev->dev, "could not register ac97 pcm device\n");
1088 goto err_dma;
1089 }
1090
1091 retval = snd_card_register(card);
1092 if (retval) {
1093 dev_dbg(&pdev->dev, "could not register sound card\n");
1094 goto err_dma;
1095 }
1096
1097 platform_set_drvdata(pdev, card);
1098
1099 dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n",
1100 chip->regs, irq);
1101
1102 return 0;
1103
1104 err_dma:
1105 if (cpu_is_at32ap7000()) {
1106 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1107 dma_release_channel(chip->dma.rx_chan);
1108 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1109 dma_release_channel(chip->dma.tx_chan);
1110 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1111 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1112 chip->dma.rx_chan = NULL;
1113 chip->dma.tx_chan = NULL;
1114 }
1115 err_ac97_bus:
1116 snd_card_set_dev(card, NULL);
1117
1118 if (gpio_is_valid(chip->reset_pin))
1119 gpio_free(chip->reset_pin);
1120
1121 iounmap(chip->regs);
1122 err_ioremap:
1123 free_irq(irq, chip);
1124 err_request_irq:
1125 snd_card_free(card);
1126 err_snd_card_new:
1127 clk_disable(pclk);
1128 clk_put(pclk);
1129 return retval;
1130 }
1131
1132 #ifdef CONFIG_PM_SLEEP
1133 static int atmel_ac97c_suspend(struct device *pdev)
1134 {
1135 struct snd_card *card = dev_get_drvdata(pdev);
1136 struct atmel_ac97c *chip = card->private_data;
1137
1138 if (cpu_is_at32ap7000()) {
1139 if (test_bit(DMA_RX_READY, &chip->flags))
1140 dw_dma_cyclic_stop(chip->dma.rx_chan);
1141 if (test_bit(DMA_TX_READY, &chip->flags))
1142 dw_dma_cyclic_stop(chip->dma.tx_chan);
1143 }
1144 clk_disable(chip->pclk);
1145
1146 return 0;
1147 }
1148
1149 static int atmel_ac97c_resume(struct device *pdev)
1150 {
1151 struct snd_card *card = dev_get_drvdata(pdev);
1152 struct atmel_ac97c *chip = card->private_data;
1153
1154 clk_enable(chip->pclk);
1155 if (cpu_is_at32ap7000()) {
1156 if (test_bit(DMA_RX_READY, &chip->flags))
1157 dw_dma_cyclic_start(chip->dma.rx_chan);
1158 if (test_bit(DMA_TX_READY, &chip->flags))
1159 dw_dma_cyclic_start(chip->dma.tx_chan);
1160 }
1161 return 0;
1162 }
1163
1164 static SIMPLE_DEV_PM_OPS(atmel_ac97c_pm, atmel_ac97c_suspend, atmel_ac97c_resume);
1165 #define ATMEL_AC97C_PM_OPS &atmel_ac97c_pm
1166 #else
1167 #define ATMEL_AC97C_PM_OPS NULL
1168 #endif
1169
1170 static int atmel_ac97c_remove(struct platform_device *pdev)
1171 {
1172 struct snd_card *card = platform_get_drvdata(pdev);
1173 struct atmel_ac97c *chip = get_chip(card);
1174
1175 if (gpio_is_valid(chip->reset_pin))
1176 gpio_free(chip->reset_pin);
1177
1178 ac97c_writel(chip, CAMR, 0);
1179 ac97c_writel(chip, COMR, 0);
1180 ac97c_writel(chip, MR, 0);
1181
1182 clk_disable(chip->pclk);
1183 clk_put(chip->pclk);
1184 iounmap(chip->regs);
1185 free_irq(chip->irq, chip);
1186
1187 if (cpu_is_at32ap7000()) {
1188 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1189 dma_release_channel(chip->dma.rx_chan);
1190 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1191 dma_release_channel(chip->dma.tx_chan);
1192 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1193 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1194 chip->dma.rx_chan = NULL;
1195 chip->dma.tx_chan = NULL;
1196 }
1197
1198 snd_card_set_dev(card, NULL);
1199 snd_card_free(card);
1200
1201 return 0;
1202 }
1203
1204 static struct platform_driver atmel_ac97c_driver = {
1205 .remove = atmel_ac97c_remove,
1206 .driver = {
1207 .name = "atmel_ac97c",
1208 .owner = THIS_MODULE,
1209 .pm = ATMEL_AC97C_PM_OPS,
1210 },
1211 };
1212
1213 static int __init atmel_ac97c_init(void)
1214 {
1215 return platform_driver_probe(&atmel_ac97c_driver,
1216 atmel_ac97c_probe);
1217 }
1218 module_init(atmel_ac97c_init);
1219
1220 static void __exit atmel_ac97c_exit(void)
1221 {
1222 platform_driver_unregister(&atmel_ac97c_driver);
1223 }
1224 module_exit(atmel_ac97c_exit);
1225
1226 MODULE_LICENSE("GPL");
1227 MODULE_DESCRIPTION("Driver for Atmel AC97 controller");
1228 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");
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