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. */
atmel_ac97c_dma_playback_period_done(void * arg)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
atmel_ac97c_dma_capture_period_done(void * arg)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
atmel_ac97c_prepare_dma(struct atmel_ac97c * chip,struct snd_pcm_substream * substream,enum dma_transfer_direction direction)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
atmel_ac97c_playback_open(struct snd_pcm_substream * substream)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
atmel_ac97c_capture_open(struct snd_pcm_substream * substream)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
atmel_ac97c_playback_close(struct snd_pcm_substream * substream)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
atmel_ac97c_capture_close(struct snd_pcm_substream * substream)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
atmel_ac97c_playback_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * hw_params)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
atmel_ac97c_capture_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * hw_params)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()) {
282 if (retval < 0)
283 return retval;
284 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
285 if (retval == 1)
286 if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
287 dw_dma_cyclic_free(chip->dma.rx_chan);
288 }
289
290 /* Set restrictions to params. */
291 mutex_lock(&opened_mutex);
292 chip->cur_rate = params_rate(hw_params);
293 chip->cur_format = params_format(hw_params);
294 mutex_unlock(&opened_mutex);
295
296 return retval;
297 }
298
atmel_ac97c_playback_hw_free(struct snd_pcm_substream * substream)299 static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream)
300 {
301 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
302 if (cpu_is_at32ap7000()) {
303 if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
304 dw_dma_cyclic_free(chip->dma.tx_chan);
305 }
306 return snd_pcm_lib_free_pages(substream);
307 }
308
atmel_ac97c_capture_hw_free(struct snd_pcm_substream * substream)309 static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream)
310 {
311 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
312 if (cpu_is_at32ap7000()) {
313 if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
314 dw_dma_cyclic_free(chip->dma.rx_chan);
315 }
316 return snd_pcm_lib_free_pages(substream);
317 }
318
atmel_ac97c_playback_prepare(struct snd_pcm_substream * substream)319 static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
320 {
321 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
322 struct snd_pcm_runtime *runtime = substream->runtime;
323 int block_size = frames_to_bytes(runtime, runtime->period_size);
324 unsigned long word = ac97c_readl(chip, OCA);
325 int retval;
326
327 chip->playback_period = 0;
328 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
329
330 /* assign channels to AC97C channel A */
331 switch (runtime->channels) {
332 case 1:
333 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
334 break;
335 case 2:
336 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
337 | AC97C_CH_ASSIGN(PCM_RIGHT, A);
338 break;
339 default:
340 /* TODO: support more than two channels */
341 return -EINVAL;
342 }
343 ac97c_writel(chip, OCA, word);
344
345 /* configure sample format and size */
346 word = ac97c_readl(chip, CAMR);
347 if (chip->opened <= 1)
348 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
349 else
350 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
351
352 switch (runtime->format) {
353 case SNDRV_PCM_FORMAT_S16_LE:
354 if (cpu_is_at32ap7000())
355 word |= AC97C_CMR_CEM_LITTLE;
356 break;
357 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
358 word &= ~(AC97C_CMR_CEM_LITTLE);
359 break;
360 default:
361 word = ac97c_readl(chip, OCA);
362 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
363 ac97c_writel(chip, OCA, word);
364 return -EINVAL;
365 }
366
367 /* Enable underrun interrupt on channel A */
368 word |= AC97C_CSR_UNRUN;
369
370 ac97c_writel(chip, CAMR, word);
371
372 /* Enable channel A event interrupt */
373 word = ac97c_readl(chip, IMR);
374 word |= AC97C_SR_CAEVT;
375 ac97c_writel(chip, IER, word);
376
377 /* set variable rate if needed */
378 if (runtime->rate != 48000) {
379 word = ac97c_readl(chip, MR);
380 word |= AC97C_MR_VRA;
381 ac97c_writel(chip, MR, word);
382 } else {
383 word = ac97c_readl(chip, MR);
384 word &= ~(AC97C_MR_VRA);
385 ac97c_writel(chip, MR, word);
386 }
387
388 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE,
389 runtime->rate);
390 if (retval)
391 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
392 runtime->rate);
393
394 if (cpu_is_at32ap7000()) {
395 if (!test_bit(DMA_TX_READY, &chip->flags))
396 retval = atmel_ac97c_prepare_dma(chip, substream,
397 DMA_MEM_TO_DEV);
398 } else {
399 /* Initialize and start the PDC */
400 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR);
401 writel(block_size / 2, chip->regs + ATMEL_PDC_TCR);
402 writel(runtime->dma_addr + block_size,
403 chip->regs + ATMEL_PDC_TNPR);
404 writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR);
405 }
406
407 return retval;
408 }
409
atmel_ac97c_capture_prepare(struct snd_pcm_substream * substream)410 static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
411 {
412 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
413 struct snd_pcm_runtime *runtime = substream->runtime;
414 int block_size = frames_to_bytes(runtime, runtime->period_size);
415 unsigned long word = ac97c_readl(chip, ICA);
416 int retval;
417
418 chip->capture_period = 0;
419 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
420
421 /* assign channels to AC97C channel A */
422 switch (runtime->channels) {
423 case 1:
424 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
425 break;
426 case 2:
427 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
428 | AC97C_CH_ASSIGN(PCM_RIGHT, A);
429 break;
430 default:
431 /* TODO: support more than two channels */
432 return -EINVAL;
433 }
434 ac97c_writel(chip, ICA, word);
435
436 /* configure sample format and size */
437 word = ac97c_readl(chip, CAMR);
438 if (chip->opened <= 1)
439 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
440 else
441 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
442
443 switch (runtime->format) {
444 case SNDRV_PCM_FORMAT_S16_LE:
445 if (cpu_is_at32ap7000())
446 word |= AC97C_CMR_CEM_LITTLE;
447 break;
448 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
449 word &= ~(AC97C_CMR_CEM_LITTLE);
450 break;
451 default:
452 word = ac97c_readl(chip, ICA);
453 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
454 ac97c_writel(chip, ICA, word);
455 return -EINVAL;
456 }
457
458 /* Enable overrun interrupt on channel A */
459 word |= AC97C_CSR_OVRUN;
460
461 ac97c_writel(chip, CAMR, word);
462
463 /* Enable channel A event interrupt */
464 word = ac97c_readl(chip, IMR);
465 word |= AC97C_SR_CAEVT;
466 ac97c_writel(chip, IER, word);
467
468 /* set variable rate if needed */
469 if (runtime->rate != 48000) {
470 word = ac97c_readl(chip, MR);
471 word |= AC97C_MR_VRA;
472 ac97c_writel(chip, MR, word);
473 } else {
474 word = ac97c_readl(chip, MR);
475 word &= ~(AC97C_MR_VRA);
476 ac97c_writel(chip, MR, word);
477 }
478
479 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE,
480 runtime->rate);
481 if (retval)
482 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
483 runtime->rate);
484
485 if (cpu_is_at32ap7000()) {
486 if (!test_bit(DMA_RX_READY, &chip->flags))
487 retval = atmel_ac97c_prepare_dma(chip, substream,
488 DMA_DEV_TO_MEM);
489 } else {
490 /* Initialize and start the PDC */
491 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR);
492 writel(block_size / 2, chip->regs + ATMEL_PDC_RCR);
493 writel(runtime->dma_addr + block_size,
494 chip->regs + ATMEL_PDC_RNPR);
495 writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR);
496 }
497
498 return retval;
499 }
500
501 static int
atmel_ac97c_playback_trigger(struct snd_pcm_substream * substream,int cmd)502 atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
503 {
504 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
505 unsigned long camr, ptcr = 0;
506 int retval = 0;
507
508 camr = ac97c_readl(chip, CAMR);
509
510 switch (cmd) {
511 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
512 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
513 case SNDRV_PCM_TRIGGER_START:
514 if (cpu_is_at32ap7000()) {
515 retval = dw_dma_cyclic_start(chip->dma.tx_chan);
516 if (retval)
517 goto out;
518 } else {
519 ptcr = ATMEL_PDC_TXTEN;
520 }
521 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX;
522 break;
523 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
524 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
525 case SNDRV_PCM_TRIGGER_STOP:
526 if (cpu_is_at32ap7000())
527 dw_dma_cyclic_stop(chip->dma.tx_chan);
528 else
529 ptcr |= ATMEL_PDC_TXTDIS;
530 if (chip->opened <= 1)
531 camr &= ~AC97C_CMR_CENA;
532 break;
533 default:
534 retval = -EINVAL;
535 goto out;
536 }
537
538 ac97c_writel(chip, CAMR, camr);
539 if (!cpu_is_at32ap7000())
540 writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
541 out:
542 return retval;
543 }
544
545 static int
atmel_ac97c_capture_trigger(struct snd_pcm_substream * substream,int cmd)546 atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
547 {
548 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
549 unsigned long camr, ptcr = 0;
550 int retval = 0;
551
552 camr = ac97c_readl(chip, CAMR);
553 ptcr = readl(chip->regs + ATMEL_PDC_PTSR);
554
555 switch (cmd) {
556 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
557 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
558 case SNDRV_PCM_TRIGGER_START:
559 if (cpu_is_at32ap7000()) {
560 retval = dw_dma_cyclic_start(chip->dma.rx_chan);
561 if (retval)
562 goto out;
563 } else {
564 ptcr = ATMEL_PDC_RXTEN;
565 }
566 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX;
567 break;
568 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
569 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
570 case SNDRV_PCM_TRIGGER_STOP:
571 if (cpu_is_at32ap7000())
572 dw_dma_cyclic_stop(chip->dma.rx_chan);
573 else
574 ptcr |= (ATMEL_PDC_RXTDIS);
575 if (chip->opened <= 1)
576 camr &= ~AC97C_CMR_CENA;
577 break;
578 default:
579 retval = -EINVAL;
580 break;
581 }
582
583 ac97c_writel(chip, CAMR, camr);
584 if (!cpu_is_at32ap7000())
585 writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
586 out:
587 return retval;
588 }
589
590 static snd_pcm_uframes_t
atmel_ac97c_playback_pointer(struct snd_pcm_substream * substream)591 atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream)
592 {
593 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
594 struct snd_pcm_runtime *runtime = substream->runtime;
595 snd_pcm_uframes_t frames;
596 unsigned long bytes;
597
598 if (cpu_is_at32ap7000())
599 bytes = dw_dma_get_src_addr(chip->dma.tx_chan);
600 else
601 bytes = readl(chip->regs + ATMEL_PDC_TPR);
602 bytes -= runtime->dma_addr;
603
604 frames = bytes_to_frames(runtime, bytes);
605 if (frames >= runtime->buffer_size)
606 frames -= runtime->buffer_size;
607 return frames;
608 }
609
610 static snd_pcm_uframes_t
atmel_ac97c_capture_pointer(struct snd_pcm_substream * substream)611 atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream)
612 {
613 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
614 struct snd_pcm_runtime *runtime = substream->runtime;
615 snd_pcm_uframes_t frames;
616 unsigned long bytes;
617
618 if (cpu_is_at32ap7000())
619 bytes = dw_dma_get_dst_addr(chip->dma.rx_chan);
620 else
621 bytes = readl(chip->regs + ATMEL_PDC_RPR);
622 bytes -= runtime->dma_addr;
623
624 frames = bytes_to_frames(runtime, bytes);
625 if (frames >= runtime->buffer_size)
626 frames -= runtime->buffer_size;
627 return frames;
628 }
629
630 static struct snd_pcm_ops atmel_ac97_playback_ops = {
631 .open = atmel_ac97c_playback_open,
632 .close = atmel_ac97c_playback_close,
633 .ioctl = snd_pcm_lib_ioctl,
634 .hw_params = atmel_ac97c_playback_hw_params,
635 .hw_free = atmel_ac97c_playback_hw_free,
636 .prepare = atmel_ac97c_playback_prepare,
637 .trigger = atmel_ac97c_playback_trigger,
638 .pointer = atmel_ac97c_playback_pointer,
639 };
640
641 static struct snd_pcm_ops atmel_ac97_capture_ops = {
642 .open = atmel_ac97c_capture_open,
643 .close = atmel_ac97c_capture_close,
644 .ioctl = snd_pcm_lib_ioctl,
645 .hw_params = atmel_ac97c_capture_hw_params,
646 .hw_free = atmel_ac97c_capture_hw_free,
647 .prepare = atmel_ac97c_capture_prepare,
648 .trigger = atmel_ac97c_capture_trigger,
649 .pointer = atmel_ac97c_capture_pointer,
650 };
651
atmel_ac97c_interrupt(int irq,void * dev)652 static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
653 {
654 struct atmel_ac97c *chip = (struct atmel_ac97c *)dev;
655 irqreturn_t retval = IRQ_NONE;
656 u32 sr = ac97c_readl(chip, SR);
657 u32 casr = ac97c_readl(chip, CASR);
658 u32 cosr = ac97c_readl(chip, COSR);
659 u32 camr = ac97c_readl(chip, CAMR);
660
661 if (sr & AC97C_SR_CAEVT) {
662 struct snd_pcm_runtime *runtime;
663 int offset, next_period, block_size;
664 dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n",
665 casr & AC97C_CSR_OVRUN ? " OVRUN" : "",
666 casr & AC97C_CSR_RXRDY ? " RXRDY" : "",
667 casr & AC97C_CSR_UNRUN ? " UNRUN" : "",
668 casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
669 casr & AC97C_CSR_TXRDY ? " TXRDY" : "",
670 !casr ? " NONE" : "");
671 if (!cpu_is_at32ap7000()) {
672 if ((casr & camr) & AC97C_CSR_ENDTX) {
673 runtime = chip->playback_substream->runtime;
674 block_size = frames_to_bytes(runtime,
675 runtime->period_size);
676 chip->playback_period++;
677
678 if (chip->playback_period == runtime->periods)
679 chip->playback_period = 0;
680 next_period = chip->playback_period + 1;
681 if (next_period == runtime->periods)
682 next_period = 0;
683
684 offset = block_size * next_period;
685
686 writel(runtime->dma_addr + offset,
687 chip->regs + ATMEL_PDC_TNPR);
688 writel(block_size / 2,
689 chip->regs + ATMEL_PDC_TNCR);
690
691 snd_pcm_period_elapsed(
692 chip->playback_substream);
693 }
694 if ((casr & camr) & AC97C_CSR_ENDRX) {
695 runtime = chip->capture_substream->runtime;
696 block_size = frames_to_bytes(runtime,
697 runtime->period_size);
698 chip->capture_period++;
699
700 if (chip->capture_period == runtime->periods)
701 chip->capture_period = 0;
702 next_period = chip->capture_period + 1;
703 if (next_period == runtime->periods)
704 next_period = 0;
705
706 offset = block_size * next_period;
707
708 writel(runtime->dma_addr + offset,
709 chip->regs + ATMEL_PDC_RNPR);
710 writel(block_size / 2,
711 chip->regs + ATMEL_PDC_RNCR);
712 snd_pcm_period_elapsed(chip->capture_substream);
713 }
714 }
715 retval = IRQ_HANDLED;
716 }
717
718 if (sr & AC97C_SR_COEVT) {
719 dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n",
720 cosr & AC97C_CSR_OVRUN ? " OVRUN" : "",
721 cosr & AC97C_CSR_RXRDY ? " RXRDY" : "",
722 cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
723 cosr & AC97C_CSR_TXRDY ? " TXRDY" : "",
724 !cosr ? " NONE" : "");
725 retval = IRQ_HANDLED;
726 }
727
728 if (retval == IRQ_NONE) {
729 dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x "
730 "casr 0x%08x cosr 0x%08x\n", sr, casr, cosr);
731 }
732
733 return retval;
734 }
735
736 static struct ac97_pcm at91_ac97_pcm_defs[] __devinitdata = {
737 /* Playback */
738 {
739 .exclusive = 1,
740 .r = { {
741 .slots = ((1 << AC97_SLOT_PCM_LEFT)
742 | (1 << AC97_SLOT_PCM_RIGHT)),
743 } },
744 },
745 /* PCM in */
746 {
747 .stream = 1,
748 .exclusive = 1,
749 .r = { {
750 .slots = ((1 << AC97_SLOT_PCM_LEFT)
751 | (1 << AC97_SLOT_PCM_RIGHT)),
752 } }
753 },
754 /* Mic in */
755 {
756 .stream = 1,
757 .exclusive = 1,
758 .r = { {
759 .slots = (1<<AC97_SLOT_MIC),
760 } }
761 },
762 };
763
atmel_ac97c_pcm_new(struct atmel_ac97c * chip)764 static int __devinit atmel_ac97c_pcm_new(struct atmel_ac97c *chip)
765 {
766 struct snd_pcm *pcm;
767 struct snd_pcm_hardware hw = atmel_ac97c_hw;
768 int capture, playback, retval, err;
769
770 capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
771 playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
772
773 if (!cpu_is_at32ap7000()) {
774 err = snd_ac97_pcm_assign(chip->ac97_bus,
775 ARRAY_SIZE(at91_ac97_pcm_defs),
776 at91_ac97_pcm_defs);
777 if (err)
778 return err;
779 }
780 retval = snd_pcm_new(chip->card, chip->card->shortname,
781 chip->pdev->id, playback, capture, &pcm);
782 if (retval)
783 return retval;
784
785 if (capture)
786 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
787 &atmel_ac97_capture_ops);
788 if (playback)
789 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
790 &atmel_ac97_playback_ops);
791
792 retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
793 &chip->pdev->dev, hw.periods_min * hw.period_bytes_min,
794 hw.buffer_bytes_max);
795 if (retval)
796 return retval;
797
798 pcm->private_data = chip;
799 pcm->info_flags = 0;
800 strcpy(pcm->name, chip->card->shortname);
801 chip->pcm = pcm;
802
803 return 0;
804 }
805
atmel_ac97c_mixer_new(struct atmel_ac97c * chip)806 static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip)
807 {
808 struct snd_ac97_template template;
809 memset(&template, 0, sizeof(template));
810 template.private_data = chip;
811 return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97);
812 }
813
atmel_ac97c_write(struct snd_ac97 * ac97,unsigned short reg,unsigned short val)814 static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg,
815 unsigned short val)
816 {
817 struct atmel_ac97c *chip = get_chip(ac97);
818 unsigned long word;
819 int timeout = 40;
820
821 word = (reg & 0x7f) << 16 | val;
822
823 do {
824 if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) {
825 ac97c_writel(chip, COTHR, word);
826 return;
827 }
828 udelay(1);
829 } while (--timeout);
830
831 dev_dbg(&chip->pdev->dev, "codec write timeout\n");
832 }
833
atmel_ac97c_read(struct snd_ac97 * ac97,unsigned short reg)834 static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97,
835 unsigned short reg)
836 {
837 struct atmel_ac97c *chip = get_chip(ac97);
838 unsigned long word;
839 int timeout = 40;
840 int write = 10;
841
842 word = (0x80 | (reg & 0x7f)) << 16;
843
844 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0)
845 ac97c_readl(chip, CORHR);
846
847 retry_write:
848 timeout = 40;
849
850 do {
851 if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) {
852 ac97c_writel(chip, COTHR, word);
853 goto read_reg;
854 }
855 udelay(10);
856 } while (--timeout);
857
858 if (!--write)
859 goto timed_out;
860 goto retry_write;
861
862 read_reg:
863 do {
864 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) {
865 unsigned short val = ac97c_readl(chip, CORHR);
866 return val;
867 }
868 udelay(10);
869 } while (--timeout);
870
871 if (!--write)
872 goto timed_out;
873 goto retry_write;
874
875 timed_out:
876 dev_dbg(&chip->pdev->dev, "codec read timeout\n");
877 return 0xffff;
878 }
879
filter(struct dma_chan * chan,void * slave)880 static bool filter(struct dma_chan *chan, void *slave)
881 {
882 struct dw_dma_slave *dws = slave;
883
884 if (dws->dma_dev == chan->device->dev) {
885 chan->private = dws;
886 return true;
887 } else
888 return false;
889 }
890
atmel_ac97c_reset(struct atmel_ac97c * chip)891 static void atmel_ac97c_reset(struct atmel_ac97c *chip)
892 {
893 ac97c_writel(chip, MR, 0);
894 ac97c_writel(chip, MR, AC97C_MR_ENA);
895 ac97c_writel(chip, CAMR, 0);
896 ac97c_writel(chip, COMR, 0);
897
898 if (gpio_is_valid(chip->reset_pin)) {
899 gpio_set_value(chip->reset_pin, 0);
900 /* AC97 v2.2 specifications says minimum 1 us. */
901 udelay(2);
902 gpio_set_value(chip->reset_pin, 1);
903 } else {
904 ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA);
905 udelay(2);
906 ac97c_writel(chip, MR, AC97C_MR_ENA);
907 }
908 }
909
atmel_ac97c_probe(struct platform_device * pdev)910 static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
911 {
912 struct snd_card *card;
913 struct atmel_ac97c *chip;
914 struct resource *regs;
915 struct ac97c_platform_data *pdata;
916 struct clk *pclk;
917 static struct snd_ac97_bus_ops ops = {
918 .write = atmel_ac97c_write,
919 .read = atmel_ac97c_read,
920 };
921 int retval;
922 int irq;
923
924 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
925 if (!regs) {
926 dev_dbg(&pdev->dev, "no memory resource\n");
927 return -ENXIO;
928 }
929
930 pdata = pdev->dev.platform_data;
931 if (!pdata) {
932 dev_dbg(&pdev->dev, "no platform data\n");
933 return -ENXIO;
934 }
935
936 irq = platform_get_irq(pdev, 0);
937 if (irq < 0) {
938 dev_dbg(&pdev->dev, "could not get irq\n");
939 return -ENXIO;
940 }
941
942 if (cpu_is_at32ap7000()) {
943 pclk = clk_get(&pdev->dev, "pclk");
944 } else {
945 pclk = clk_get(&pdev->dev, "ac97_clk");
946 }
947
948 if (IS_ERR(pclk)) {
949 dev_dbg(&pdev->dev, "no peripheral clock\n");
950 return PTR_ERR(pclk);
951 }
952 clk_enable(pclk);
953
954 retval = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
955 THIS_MODULE, sizeof(struct atmel_ac97c), &card);
956 if (retval) {
957 dev_dbg(&pdev->dev, "could not create sound card device\n");
958 goto err_snd_card_new;
959 }
960
961 chip = get_chip(card);
962
963 retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip);
964 if (retval) {
965 dev_dbg(&pdev->dev, "unable to request irq %d\n", irq);
966 goto err_request_irq;
967 }
968 chip->irq = irq;
969
970 spin_lock_init(&chip->lock);
971
972 strcpy(card->driver, "Atmel AC97C");
973 strcpy(card->shortname, "Atmel AC97C");
974 sprintf(card->longname, "Atmel AC97 controller");
975
976 chip->card = card;
977 chip->pclk = pclk;
978 chip->pdev = pdev;
979 chip->regs = ioremap(regs->start, resource_size(regs));
980
981 if (!chip->regs) {
982 dev_dbg(&pdev->dev, "could not remap register memory\n");
983 goto err_ioremap;
984 }
985
986 if (gpio_is_valid(pdata->reset_pin)) {
987 if (gpio_request(pdata->reset_pin, "reset_pin")) {
988 dev_dbg(&pdev->dev, "reset pin not available\n");
989 chip->reset_pin = -ENODEV;
990 } else {
991 gpio_direction_output(pdata->reset_pin, 1);
992 chip->reset_pin = pdata->reset_pin;
993 }
994 }
995
996 snd_card_set_dev(card, &pdev->dev);
997
998 atmel_ac97c_reset(chip);
999
1000 /* Enable overrun interrupt from codec channel */
1001 ac97c_writel(chip, COMR, AC97C_CSR_OVRUN);
1002 ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT);
1003
1004 retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus);
1005 if (retval) {
1006 dev_dbg(&pdev->dev, "could not register on ac97 bus\n");
1007 goto err_ac97_bus;
1008 }
1009
1010 retval = atmel_ac97c_mixer_new(chip);
1011 if (retval) {
1012 dev_dbg(&pdev->dev, "could not register ac97 mixer\n");
1013 goto err_ac97_bus;
1014 }
1015
1016 if (cpu_is_at32ap7000()) {
1017 if (pdata->rx_dws.dma_dev) {
1018 dma_cap_mask_t mask;
1019
1020 dma_cap_zero(mask);
1021 dma_cap_set(DMA_SLAVE, mask);
1022
1023 chip->dma.rx_chan = dma_request_channel(mask, filter,
1024 &pdata->rx_dws);
1025 if (chip->dma.rx_chan) {
1026 struct dma_slave_config dma_conf = {
1027 .src_addr = regs->start + AC97C_CARHR +
1028 2,
1029 .src_addr_width =
1030 DMA_SLAVE_BUSWIDTH_2_BYTES,
1031 .src_maxburst = 1,
1032 .dst_maxburst = 1,
1033 .direction = DMA_DEV_TO_MEM,
1034 .device_fc = false,
1035 };
1036
1037 dmaengine_slave_config(chip->dma.rx_chan,
1038 &dma_conf);
1039 }
1040
1041 dev_info(&chip->pdev->dev, "using %s for DMA RX\n",
1042 dev_name(&chip->dma.rx_chan->dev->device));
1043 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1044 }
1045
1046 if (pdata->tx_dws.dma_dev) {
1047 dma_cap_mask_t mask;
1048
1049 dma_cap_zero(mask);
1050 dma_cap_set(DMA_SLAVE, mask);
1051
1052 chip->dma.tx_chan = dma_request_channel(mask, filter,
1053 &pdata->tx_dws);
1054 if (chip->dma.tx_chan) {
1055 struct dma_slave_config dma_conf = {
1056 .dst_addr = regs->start + AC97C_CATHR +
1057 2,
1058 .dst_addr_width =
1059 DMA_SLAVE_BUSWIDTH_2_BYTES,
1060 .src_maxburst = 1,
1061 .dst_maxburst = 1,
1062 .direction = DMA_MEM_TO_DEV,
1063 .device_fc = false,
1064 };
1065
1066 dmaengine_slave_config(chip->dma.tx_chan,
1067 &dma_conf);
1068 }
1069
1070 dev_info(&chip->pdev->dev, "using %s for DMA TX\n",
1071 dev_name(&chip->dma.tx_chan->dev->device));
1072 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1073 }
1074
1075 if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) &&
1076 !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) {
1077 dev_dbg(&pdev->dev, "DMA not available\n");
1078 retval = -ENODEV;
1079 goto err_dma;
1080 }
1081 } else {
1082 /* Just pretend that we have DMA channel(for at91 i is actually
1083 * the PDC) */
1084 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1085 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1086 }
1087
1088 retval = atmel_ac97c_pcm_new(chip);
1089 if (retval) {
1090 dev_dbg(&pdev->dev, "could not register ac97 pcm device\n");
1091 goto err_dma;
1092 }
1093
1094 retval = snd_card_register(card);
1095 if (retval) {
1096 dev_dbg(&pdev->dev, "could not register sound card\n");
1097 goto err_dma;
1098 }
1099
1100 platform_set_drvdata(pdev, card);
1101
1102 dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n",
1103 chip->regs, irq);
1104
1105 return 0;
1106
1107 err_dma:
1108 if (cpu_is_at32ap7000()) {
1109 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1110 dma_release_channel(chip->dma.rx_chan);
1111 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1112 dma_release_channel(chip->dma.tx_chan);
1113 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1114 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1115 chip->dma.rx_chan = NULL;
1116 chip->dma.tx_chan = NULL;
1117 }
1118 err_ac97_bus:
1119 snd_card_set_dev(card, NULL);
1120
1121 if (gpio_is_valid(chip->reset_pin))
1122 gpio_free(chip->reset_pin);
1123
1124 iounmap(chip->regs);
1125 err_ioremap:
1126 free_irq(irq, chip);
1127 err_request_irq:
1128 snd_card_free(card);
1129 err_snd_card_new:
1130 clk_disable(pclk);
1131 clk_put(pclk);
1132 return retval;
1133 }
1134
1135 #ifdef CONFIG_PM
atmel_ac97c_suspend(struct platform_device * pdev,pm_message_t msg)1136 static int atmel_ac97c_suspend(struct platform_device *pdev, pm_message_t msg)
1137 {
1138 struct snd_card *card = platform_get_drvdata(pdev);
1139 struct atmel_ac97c *chip = card->private_data;
1140
1141 if (cpu_is_at32ap7000()) {
1142 if (test_bit(DMA_RX_READY, &chip->flags))
1143 dw_dma_cyclic_stop(chip->dma.rx_chan);
1144 if (test_bit(DMA_TX_READY, &chip->flags))
1145 dw_dma_cyclic_stop(chip->dma.tx_chan);
1146 }
1147 clk_disable(chip->pclk);
1148
1149 return 0;
1150 }
1151
atmel_ac97c_resume(struct platform_device * pdev)1152 static int atmel_ac97c_resume(struct platform_device *pdev)
1153 {
1154 struct snd_card *card = platform_get_drvdata(pdev);
1155 struct atmel_ac97c *chip = card->private_data;
1156
1157 clk_enable(chip->pclk);
1158 if (cpu_is_at32ap7000()) {
1159 if (test_bit(DMA_RX_READY, &chip->flags))
1160 dw_dma_cyclic_start(chip->dma.rx_chan);
1161 if (test_bit(DMA_TX_READY, &chip->flags))
1162 dw_dma_cyclic_start(chip->dma.tx_chan);
1163 }
1164 return 0;
1165 }
1166 #else
1167 #define atmel_ac97c_suspend NULL
1168 #define atmel_ac97c_resume NULL
1169 #endif
1170
atmel_ac97c_remove(struct platform_device * pdev)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 },
1212 .suspend = atmel_ac97c_suspend,
1213 .resume = atmel_ac97c_resume,
1214 };
1215
atmel_ac97c_init(void)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
atmel_ac97c_exit(void)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>");
1232