2 * Driver for Atmel AC97C
4 * Copyright (C) 2005-2009 Atmel Corporation
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.
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>
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>
34 #include <linux/platform_data/dma-dw.h>
35 #include <linux/dma/dw.h>
40 #define cpu_is_at32ap7000() 0
52 /* Serialize access to opened variable */
53 static DEFINE_MUTEX(opened_mutex);
55 struct atmel_ac97c_dma {
56 struct dma_chan *rx_chan;
57 struct dma_chan *tx_chan;
62 struct platform_device *pdev;
63 struct atmel_ac97c_dma dma;
65 struct snd_pcm_substream *playback_substream;
66 struct snd_pcm_substream *capture_substream;
67 struct snd_card *card;
69 struct snd_ac97 *ac97;
70 struct snd_ac97_bus *ac97_bus;
73 unsigned int cur_rate;
75 int playback_period, capture_period;
76 /* Serialize access to opened variable */
84 #define get_chip(card) ((struct atmel_ac97c *)(card)->private_data)
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)
91 /* This function is called by the DMA driver. */
92 static void atmel_ac97c_dma_playback_period_done(void *arg)
94 struct atmel_ac97c *chip = arg;
95 snd_pcm_period_elapsed(chip->playback_substream);
98 static void atmel_ac97c_dma_capture_period_done(void *arg)
100 struct atmel_ac97c *chip = arg;
101 snd_pcm_period_elapsed(chip->capture_substream);
104 static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip,
105 struct snd_pcm_substream *substream,
106 enum dma_transfer_direction direction)
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;
114 * We don't do DMA on "complex" transfers, i.e. with
115 * non-halfword-aligned buffers or lengths.
117 if (runtime->dma_addr & 1 || runtime->buffer_size & 1) {
118 dev_dbg(&chip->pdev->dev, "too complex transfer\n");
122 if (direction == DMA_MEM_TO_DEV)
123 chan = chip->dma.tx_chan;
125 chan = chip->dma.rx_chan;
127 buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
128 period_len = frames_to_bytes(runtime, runtime->period_size);
130 cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len,
131 period_len, direction);
133 dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n");
134 return PTR_ERR(cdesc);
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);
141 cdesc->period_callback = atmel_ac97c_dma_capture_period_done;
142 set_bit(DMA_RX_READY, &chip->flags);
145 cdesc->period_callback_param = chip;
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),
165 .buffer_bytes_max = 2 * 2 * 64 * 2048,
166 .period_bytes_min = 4096,
167 .period_bytes_max = 4096,
172 static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream)
174 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
175 struct snd_pcm_runtime *runtime = substream->runtime;
177 mutex_lock(&opened_mutex);
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;
184 if (chip->cur_format)
185 runtime->hw.formats = pcm_format_to_bits(chip->cur_format);
186 mutex_unlock(&opened_mutex);
187 chip->playback_substream = substream;
191 static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream)
193 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
194 struct snd_pcm_runtime *runtime = substream->runtime;
196 mutex_lock(&opened_mutex);
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;
203 if (chip->cur_format)
204 runtime->hw.formats = pcm_format_to_bits(chip->cur_format);
205 mutex_unlock(&opened_mutex);
206 chip->capture_substream = substream;
210 static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream)
212 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
214 mutex_lock(&opened_mutex);
218 chip->cur_format = 0;
220 mutex_unlock(&opened_mutex);
222 chip->playback_substream = NULL;
227 static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream)
229 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
231 mutex_lock(&opened_mutex);
235 chip->cur_format = 0;
237 mutex_unlock(&opened_mutex);
239 chip->capture_substream = NULL;
244 static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream,
245 struct snd_pcm_hw_params *hw_params)
247 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
250 retval = snd_pcm_lib_malloc_pages(substream,
251 params_buffer_bytes(hw_params));
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. */
258 if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
259 dw_dma_cyclic_free(chip->dma.tx_chan);
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);
270 static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream,
271 struct snd_pcm_hw_params *hw_params)
273 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
276 retval = snd_pcm_lib_malloc_pages(substream,
277 params_buffer_bytes(hw_params));
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);
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);
294 static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream)
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);
301 return snd_pcm_lib_free_pages(substream);
304 static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream)
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);
311 return snd_pcm_lib_free_pages(substream);
314 static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
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);
322 chip->playback_period = 0;
323 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
325 /* assign channels to AC97C channel A */
326 switch (runtime->channels) {
328 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
331 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
332 | AC97C_CH_ASSIGN(PCM_RIGHT, A);
335 /* TODO: support more than two channels */
338 ac97c_writel(chip, OCA, word);
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;
345 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
347 switch (runtime->format) {
348 case SNDRV_PCM_FORMAT_S16_LE:
349 if (cpu_is_at32ap7000())
350 word |= AC97C_CMR_CEM_LITTLE;
352 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
353 word &= ~(AC97C_CMR_CEM_LITTLE);
356 word = ac97c_readl(chip, OCA);
357 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
358 ac97c_writel(chip, OCA, word);
362 /* Enable underrun interrupt on channel A */
363 word |= AC97C_CSR_UNRUN;
365 ac97c_writel(chip, CAMR, word);
367 /* Enable channel A event interrupt */
368 word = ac97c_readl(chip, IMR);
369 word |= AC97C_SR_CAEVT;
370 ac97c_writel(chip, IER, word);
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);
378 word = ac97c_readl(chip, MR);
379 word &= ~(AC97C_MR_VRA);
380 ac97c_writel(chip, MR, word);
383 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE,
386 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
389 if (cpu_is_at32ap7000()) {
390 if (!test_bit(DMA_TX_READY, &chip->flags))
391 retval = atmel_ac97c_prepare_dma(chip, substream,
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);
405 static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
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);
413 chip->capture_period = 0;
414 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
416 /* assign channels to AC97C channel A */
417 switch (runtime->channels) {
419 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
422 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
423 | AC97C_CH_ASSIGN(PCM_RIGHT, A);
426 /* TODO: support more than two channels */
429 ac97c_writel(chip, ICA, word);
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;
436 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
438 switch (runtime->format) {
439 case SNDRV_PCM_FORMAT_S16_LE:
440 if (cpu_is_at32ap7000())
441 word |= AC97C_CMR_CEM_LITTLE;
443 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
444 word &= ~(AC97C_CMR_CEM_LITTLE);
447 word = ac97c_readl(chip, ICA);
448 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
449 ac97c_writel(chip, ICA, word);
453 /* Enable overrun interrupt on channel A */
454 word |= AC97C_CSR_OVRUN;
456 ac97c_writel(chip, CAMR, word);
458 /* Enable channel A event interrupt */
459 word = ac97c_readl(chip, IMR);
460 word |= AC97C_SR_CAEVT;
461 ac97c_writel(chip, IER, word);
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);
469 word = ac97c_readl(chip, MR);
470 word &= ~(AC97C_MR_VRA);
471 ac97c_writel(chip, MR, word);
474 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE,
477 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
480 if (cpu_is_at32ap7000()) {
481 if (!test_bit(DMA_RX_READY, &chip->flags))
482 retval = atmel_ac97c_prepare_dma(chip, substream,
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);
497 atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
499 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
500 unsigned long camr, ptcr = 0;
503 camr = ac97c_readl(chip, CAMR);
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);
514 ptcr = ATMEL_PDC_TXTEN;
516 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX;
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);
524 ptcr |= ATMEL_PDC_TXTDIS;
525 if (chip->opened <= 1)
526 camr &= ~AC97C_CMR_CENA;
533 ac97c_writel(chip, CAMR, camr);
534 if (!cpu_is_at32ap7000())
535 writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
541 atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
543 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
544 unsigned long camr, ptcr = 0;
547 camr = ac97c_readl(chip, CAMR);
548 ptcr = readl(chip->regs + ATMEL_PDC_PTSR);
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);
559 ptcr = ATMEL_PDC_RXTEN;
561 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX;
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);
569 ptcr |= (ATMEL_PDC_RXTDIS);
570 if (chip->opened <= 1)
571 camr &= ~AC97C_CMR_CENA;
578 ac97c_writel(chip, CAMR, camr);
579 if (!cpu_is_at32ap7000())
580 writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
585 static snd_pcm_uframes_t
586 atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream)
588 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
589 struct snd_pcm_runtime *runtime = substream->runtime;
590 snd_pcm_uframes_t frames;
593 if (cpu_is_at32ap7000())
594 bytes = dw_dma_get_src_addr(chip->dma.tx_chan);
596 bytes = readl(chip->regs + ATMEL_PDC_TPR);
597 bytes -= runtime->dma_addr;
599 frames = bytes_to_frames(runtime, bytes);
600 if (frames >= runtime->buffer_size)
601 frames -= runtime->buffer_size;
605 static snd_pcm_uframes_t
606 atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream)
608 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
609 struct snd_pcm_runtime *runtime = substream->runtime;
610 snd_pcm_uframes_t frames;
613 if (cpu_is_at32ap7000())
614 bytes = dw_dma_get_dst_addr(chip->dma.rx_chan);
616 bytes = readl(chip->regs + ATMEL_PDC_RPR);
617 bytes -= runtime->dma_addr;
619 frames = bytes_to_frames(runtime, bytes);
620 if (frames >= runtime->buffer_size)
621 frames -= runtime->buffer_size;
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,
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,
647 static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
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);
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++;
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)
679 offset = block_size * next_period;
681 writel(runtime->dma_addr + offset,
682 chip->regs + ATMEL_PDC_TNPR);
683 writel(block_size / 2,
684 chip->regs + ATMEL_PDC_TNCR);
686 snd_pcm_period_elapsed(
687 chip->playback_substream);
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++;
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)
701 offset = block_size * next_period;
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);
710 retval = IRQ_HANDLED;
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;
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);
731 static struct ac97_pcm at91_ac97_pcm_defs[] = {
736 .slots = ((1 << AC97_SLOT_PCM_LEFT)
737 | (1 << AC97_SLOT_PCM_RIGHT)),
745 .slots = ((1 << AC97_SLOT_PCM_LEFT)
746 | (1 << AC97_SLOT_PCM_RIGHT)),
754 .slots = (1<<AC97_SLOT_MIC),
759 static int atmel_ac97c_pcm_new(struct atmel_ac97c *chip)
762 struct snd_pcm_hardware hw = atmel_ac97c_hw;
763 int capture, playback, retval, err;
765 capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
766 playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
768 if (!cpu_is_at32ap7000()) {
769 err = snd_ac97_pcm_assign(chip->ac97_bus,
770 ARRAY_SIZE(at91_ac97_pcm_defs),
775 retval = snd_pcm_new(chip->card, chip->card->shortname,
776 0, playback, capture, &pcm);
781 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
782 &atmel_ac97_capture_ops);
784 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
785 &atmel_ac97_playback_ops);
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);
793 pcm->private_data = chip;
795 strcpy(pcm->name, chip->card->shortname);
801 static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip)
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);
809 static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg,
812 struct atmel_ac97c *chip = get_chip(ac97);
816 word = (reg & 0x7f) << 16 | val;
819 if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) {
820 ac97c_writel(chip, COTHR, word);
826 dev_dbg(&chip->pdev->dev, "codec write timeout\n");
829 static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97,
832 struct atmel_ac97c *chip = get_chip(ac97);
837 word = (0x80 | (reg & 0x7f)) << 16;
839 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0)
840 ac97c_readl(chip, CORHR);
846 if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) {
847 ac97c_writel(chip, COTHR, word);
859 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) {
860 unsigned short val = ac97c_readl(chip, CORHR);
871 dev_dbg(&chip->pdev->dev, "codec read timeout\n");
875 static bool filter(struct dma_chan *chan, void *slave)
877 struct dw_dma_slave *dws = slave;
879 if (dws->dma_dev == chan->device->dev) {
886 static void atmel_ac97c_reset(struct atmel_ac97c *chip)
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);
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. */
897 gpio_set_value(chip->reset_pin, 1);
899 ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA);
901 ac97c_writel(chip, MR, AC97C_MR_ENA);
905 static int atmel_ac97c_probe(struct platform_device *pdev)
907 struct snd_card *card;
908 struct atmel_ac97c *chip;
909 struct resource *regs;
910 struct ac97c_platform_data *pdata;
912 static struct snd_ac97_bus_ops ops = {
913 .write = atmel_ac97c_write,
914 .read = atmel_ac97c_read,
919 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
921 dev_dbg(&pdev->dev, "no memory resource\n");
925 pdata = pdev->dev.platform_data;
927 dev_dbg(&pdev->dev, "no platform data\n");
931 irq = platform_get_irq(pdev, 0);
933 dev_dbg(&pdev->dev, "could not get irq\n");
937 if (cpu_is_at32ap7000()) {
938 pclk = clk_get(&pdev->dev, "pclk");
940 pclk = clk_get(&pdev->dev, "ac97_clk");
944 dev_dbg(&pdev->dev, "no peripheral clock\n");
945 return PTR_ERR(pclk);
947 clk_prepare_enable(pclk);
949 retval = snd_card_new(&pdev->dev, SNDRV_DEFAULT_IDX1,
950 SNDRV_DEFAULT_STR1, THIS_MODULE,
951 sizeof(struct atmel_ac97c), &card);
953 dev_dbg(&pdev->dev, "could not create sound card device\n");
954 goto err_snd_card_new;
957 chip = get_chip(card);
959 retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip);
961 dev_dbg(&pdev->dev, "unable to request irq %d\n", irq);
962 goto err_request_irq;
966 spin_lock_init(&chip->lock);
968 strcpy(card->driver, "Atmel AC97C");
969 strcpy(card->shortname, "Atmel AC97C");
970 sprintf(card->longname, "Atmel AC97 controller");
975 chip->regs = ioremap(regs->start, resource_size(regs));
978 dev_dbg(&pdev->dev, "could not remap register memory\n");
983 if (gpio_is_valid(pdata->reset_pin)) {
984 if (gpio_request(pdata->reset_pin, "reset_pin")) {
985 dev_dbg(&pdev->dev, "reset pin not available\n");
986 chip->reset_pin = -ENODEV;
988 gpio_direction_output(pdata->reset_pin, 1);
989 chip->reset_pin = pdata->reset_pin;
992 chip->reset_pin = -EINVAL;
995 atmel_ac97c_reset(chip);
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);
1001 retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus);
1003 dev_dbg(&pdev->dev, "could not register on ac97 bus\n");
1007 retval = atmel_ac97c_mixer_new(chip);
1009 dev_dbg(&pdev->dev, "could not register ac97 mixer\n");
1013 if (cpu_is_at32ap7000()) {
1014 if (pdata->rx_dws.dma_dev) {
1015 dma_cap_mask_t mask;
1018 dma_cap_set(DMA_SLAVE, mask);
1020 chip->dma.rx_chan = dma_request_channel(mask, filter,
1022 if (chip->dma.rx_chan) {
1023 struct dma_slave_config dma_conf = {
1024 .src_addr = regs->start + AC97C_CARHR +
1027 DMA_SLAVE_BUSWIDTH_2_BYTES,
1030 .direction = DMA_DEV_TO_MEM,
1034 dmaengine_slave_config(chip->dma.rx_chan,
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);
1043 if (pdata->tx_dws.dma_dev) {
1044 dma_cap_mask_t mask;
1047 dma_cap_set(DMA_SLAVE, mask);
1049 chip->dma.tx_chan = dma_request_channel(mask, filter,
1051 if (chip->dma.tx_chan) {
1052 struct dma_slave_config dma_conf = {
1053 .dst_addr = regs->start + AC97C_CATHR +
1056 DMA_SLAVE_BUSWIDTH_2_BYTES,
1059 .direction = DMA_MEM_TO_DEV,
1063 dmaengine_slave_config(chip->dma.tx_chan,
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);
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");
1079 /* Just pretend that we have DMA channel(for at91 i is actually
1081 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1082 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1085 retval = atmel_ac97c_pcm_new(chip);
1087 dev_dbg(&pdev->dev, "could not register ac97 pcm device\n");
1091 retval = snd_card_register(card);
1093 dev_dbg(&pdev->dev, "could not register sound card\n");
1097 platform_set_drvdata(pdev, card);
1099 dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n",
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;
1116 if (gpio_is_valid(chip->reset_pin))
1117 gpio_free(chip->reset_pin);
1119 iounmap(chip->regs);
1121 free_irq(irq, chip);
1123 snd_card_free(card);
1125 clk_disable_unprepare(pclk);
1130 #ifdef CONFIG_PM_SLEEP
1131 static int atmel_ac97c_suspend(struct device *pdev)
1133 struct snd_card *card = dev_get_drvdata(pdev);
1134 struct atmel_ac97c *chip = card->private_data;
1136 if (cpu_is_at32ap7000()) {
1137 if (test_bit(DMA_RX_READY, &chip->flags))
1138 dw_dma_cyclic_stop(chip->dma.rx_chan);
1139 if (test_bit(DMA_TX_READY, &chip->flags))
1140 dw_dma_cyclic_stop(chip->dma.tx_chan);
1142 clk_disable_unprepare(chip->pclk);
1147 static int atmel_ac97c_resume(struct device *pdev)
1149 struct snd_card *card = dev_get_drvdata(pdev);
1150 struct atmel_ac97c *chip = card->private_data;
1152 clk_prepare_enable(chip->pclk);
1153 if (cpu_is_at32ap7000()) {
1154 if (test_bit(DMA_RX_READY, &chip->flags))
1155 dw_dma_cyclic_start(chip->dma.rx_chan);
1156 if (test_bit(DMA_TX_READY, &chip->flags))
1157 dw_dma_cyclic_start(chip->dma.tx_chan);
1162 static SIMPLE_DEV_PM_OPS(atmel_ac97c_pm, atmel_ac97c_suspend, atmel_ac97c_resume);
1163 #define ATMEL_AC97C_PM_OPS &atmel_ac97c_pm
1165 #define ATMEL_AC97C_PM_OPS NULL
1168 static int atmel_ac97c_remove(struct platform_device *pdev)
1170 struct snd_card *card = platform_get_drvdata(pdev);
1171 struct atmel_ac97c *chip = get_chip(card);
1173 if (gpio_is_valid(chip->reset_pin))
1174 gpio_free(chip->reset_pin);
1176 ac97c_writel(chip, CAMR, 0);
1177 ac97c_writel(chip, COMR, 0);
1178 ac97c_writel(chip, MR, 0);
1180 clk_disable_unprepare(chip->pclk);
1181 clk_put(chip->pclk);
1182 iounmap(chip->regs);
1183 free_irq(chip->irq, chip);
1185 if (cpu_is_at32ap7000()) {
1186 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1187 dma_release_channel(chip->dma.rx_chan);
1188 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1189 dma_release_channel(chip->dma.tx_chan);
1190 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1191 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1192 chip->dma.rx_chan = NULL;
1193 chip->dma.tx_chan = NULL;
1196 snd_card_free(card);
1201 static struct platform_driver atmel_ac97c_driver = {
1202 .probe = atmel_ac97c_probe,
1203 .remove = atmel_ac97c_remove,
1205 .name = "atmel_ac97c",
1206 .pm = ATMEL_AC97C_PM_OPS,
1209 module_platform_driver(atmel_ac97c_driver);
1211 MODULE_LICENSE("GPL");
1212 MODULE_DESCRIPTION("Driver for Atmel AC97 controller");
1213 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");