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>
25 #include <sound/core.h>
26 #include <sound/initval.h>
27 #include <sound/pcm.h>
28 #include <sound/pcm_params.h>
29 #include <sound/ac97_codec.h>
30 #include <sound/atmel-ac97c.h>
31 #include <sound/memalloc.h>
33 #include <linux/dw_dmac.h>
36 #include <mach/hardware.h>
37 #include <mach/gpio.h>
48 /* Serialize access to opened variable */
49 static DEFINE_MUTEX(opened_mutex);
51 struct atmel_ac97c_dma {
52 struct dma_chan *rx_chan;
53 struct dma_chan *tx_chan;
58 struct platform_device *pdev;
59 struct atmel_ac97c_dma dma;
61 struct snd_pcm_substream *playback_substream;
62 struct snd_pcm_substream *capture_substream;
63 struct snd_card *card;
65 struct snd_ac97 *ac97;
66 struct snd_ac97_bus *ac97_bus;
69 unsigned int cur_rate;
71 int playback_period, capture_period;
72 /* Serialize access to opened variable */
80 #define get_chip(card) ((struct atmel_ac97c *)(card)->private_data)
82 #define ac97c_writel(chip, reg, val) \
83 __raw_writel((val), (chip)->regs + AC97C_##reg)
84 #define ac97c_readl(chip, reg) \
85 __raw_readl((chip)->regs + AC97C_##reg)
87 /* This function is called by the DMA driver. */
88 static void atmel_ac97c_dma_playback_period_done(void *arg)
90 struct atmel_ac97c *chip = arg;
91 snd_pcm_period_elapsed(chip->playback_substream);
94 static void atmel_ac97c_dma_capture_period_done(void *arg)
96 struct atmel_ac97c *chip = arg;
97 snd_pcm_period_elapsed(chip->capture_substream);
100 static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip,
101 struct snd_pcm_substream *substream,
102 enum dma_data_direction direction)
104 struct dma_chan *chan;
105 struct dw_cyclic_desc *cdesc;
106 struct snd_pcm_runtime *runtime = substream->runtime;
107 unsigned long buffer_len, period_len;
110 * We don't do DMA on "complex" transfers, i.e. with
111 * non-halfword-aligned buffers or lengths.
113 if (runtime->dma_addr & 1 || runtime->buffer_size & 1) {
114 dev_dbg(&chip->pdev->dev, "too complex transfer\n");
118 if (direction == DMA_TO_DEVICE)
119 chan = chip->dma.tx_chan;
121 chan = chip->dma.rx_chan;
123 buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
124 period_len = frames_to_bytes(runtime, runtime->period_size);
126 cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len,
127 period_len, direction);
129 dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n");
130 return PTR_ERR(cdesc);
133 if (direction == DMA_TO_DEVICE) {
134 cdesc->period_callback = atmel_ac97c_dma_playback_period_done;
135 set_bit(DMA_TX_READY, &chip->flags);
137 cdesc->period_callback = atmel_ac97c_dma_capture_period_done;
138 set_bit(DMA_RX_READY, &chip->flags);
141 cdesc->period_callback_param = chip;
146 static struct snd_pcm_hardware atmel_ac97c_hw = {
147 .info = (SNDRV_PCM_INFO_MMAP
148 | SNDRV_PCM_INFO_MMAP_VALID
149 | SNDRV_PCM_INFO_INTERLEAVED
150 | SNDRV_PCM_INFO_BLOCK_TRANSFER
151 | SNDRV_PCM_INFO_JOINT_DUPLEX
152 | SNDRV_PCM_INFO_RESUME
153 | SNDRV_PCM_INFO_PAUSE),
154 .formats = (SNDRV_PCM_FMTBIT_S16_BE
155 | SNDRV_PCM_FMTBIT_S16_LE),
156 .rates = (SNDRV_PCM_RATE_CONTINUOUS),
161 .buffer_bytes_max = 2 * 2 * 64 * 2048,
162 .period_bytes_min = 4096,
163 .period_bytes_max = 4096,
168 static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream)
170 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
171 struct snd_pcm_runtime *runtime = substream->runtime;
173 mutex_lock(&opened_mutex);
175 runtime->hw = atmel_ac97c_hw;
176 if (chip->cur_rate) {
177 runtime->hw.rate_min = chip->cur_rate;
178 runtime->hw.rate_max = chip->cur_rate;
180 if (chip->cur_format)
181 runtime->hw.formats = (1ULL << chip->cur_format);
182 mutex_unlock(&opened_mutex);
183 chip->playback_substream = substream;
187 static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream)
189 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
190 struct snd_pcm_runtime *runtime = substream->runtime;
192 mutex_lock(&opened_mutex);
194 runtime->hw = atmel_ac97c_hw;
195 if (chip->cur_rate) {
196 runtime->hw.rate_min = chip->cur_rate;
197 runtime->hw.rate_max = chip->cur_rate;
199 if (chip->cur_format)
200 runtime->hw.formats = (1ULL << chip->cur_format);
201 mutex_unlock(&opened_mutex);
202 chip->capture_substream = substream;
206 static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream)
208 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
210 mutex_lock(&opened_mutex);
214 chip->cur_format = 0;
216 mutex_unlock(&opened_mutex);
218 chip->playback_substream = NULL;
223 static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream)
225 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
227 mutex_lock(&opened_mutex);
231 chip->cur_format = 0;
233 mutex_unlock(&opened_mutex);
235 chip->capture_substream = NULL;
240 static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream,
241 struct snd_pcm_hw_params *hw_params)
243 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
246 retval = snd_pcm_lib_malloc_pages(substream,
247 params_buffer_bytes(hw_params));
250 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
251 if (cpu_is_at32ap7000()) {
252 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
254 if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
255 dw_dma_cyclic_free(chip->dma.tx_chan);
257 /* Set restrictions to params. */
258 mutex_lock(&opened_mutex);
259 chip->cur_rate = params_rate(hw_params);
260 chip->cur_format = params_format(hw_params);
261 mutex_unlock(&opened_mutex);
266 static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream,
267 struct snd_pcm_hw_params *hw_params)
269 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
272 retval = snd_pcm_lib_malloc_pages(substream,
273 params_buffer_bytes(hw_params));
276 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
277 if (cpu_is_at32ap7000()) {
280 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
282 if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
283 dw_dma_cyclic_free(chip->dma.rx_chan);
286 /* Set restrictions to params. */
287 mutex_lock(&opened_mutex);
288 chip->cur_rate = params_rate(hw_params);
289 chip->cur_format = params_format(hw_params);
290 mutex_unlock(&opened_mutex);
295 static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream)
297 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
298 if (cpu_is_at32ap7000()) {
299 if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
300 dw_dma_cyclic_free(chip->dma.tx_chan);
302 return snd_pcm_lib_free_pages(substream);
305 static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream)
307 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
308 if (cpu_is_at32ap7000()) {
309 if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
310 dw_dma_cyclic_free(chip->dma.rx_chan);
312 return snd_pcm_lib_free_pages(substream);
315 static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
317 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
318 struct snd_pcm_runtime *runtime = substream->runtime;
319 int block_size = frames_to_bytes(runtime, runtime->period_size);
320 unsigned long word = ac97c_readl(chip, OCA);
323 chip->playback_period = 0;
324 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
326 /* assign channels to AC97C channel A */
327 switch (runtime->channels) {
329 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
332 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
333 | AC97C_CH_ASSIGN(PCM_RIGHT, A);
336 /* TODO: support more than two channels */
339 ac97c_writel(chip, OCA, word);
341 /* configure sample format and size */
342 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
344 switch (runtime->format) {
345 case SNDRV_PCM_FORMAT_S16_LE:
346 if (cpu_is_at32ap7000())
347 word |= AC97C_CMR_CEM_LITTLE;
349 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
350 word &= ~(AC97C_CMR_CEM_LITTLE);
353 word = ac97c_readl(chip, OCA);
354 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
355 ac97c_writel(chip, OCA, word);
359 /* Enable underrun interrupt on channel A */
360 word |= AC97C_CSR_UNRUN;
362 ac97c_writel(chip, CAMR, word);
364 /* Enable channel A event interrupt */
365 word = ac97c_readl(chip, IMR);
366 word |= AC97C_SR_CAEVT;
367 ac97c_writel(chip, IER, word);
369 /* set variable rate if needed */
370 if (runtime->rate != 48000) {
371 word = ac97c_readl(chip, MR);
372 word |= AC97C_MR_VRA;
373 ac97c_writel(chip, MR, word);
375 word = ac97c_readl(chip, MR);
376 word &= ~(AC97C_MR_VRA);
377 ac97c_writel(chip, MR, word);
380 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE,
383 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
386 if (cpu_is_at32ap7000()) {
387 if (!test_bit(DMA_TX_READY, &chip->flags))
388 retval = atmel_ac97c_prepare_dma(chip, substream,
391 /* Initialize and start the PDC */
392 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR);
393 writel(block_size / 2, chip->regs + ATMEL_PDC_TCR);
394 writel(runtime->dma_addr + block_size,
395 chip->regs + ATMEL_PDC_TNPR);
396 writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR);
402 static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
404 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
405 struct snd_pcm_runtime *runtime = substream->runtime;
406 int block_size = frames_to_bytes(runtime, runtime->period_size);
407 unsigned long word = ac97c_readl(chip, ICA);
410 chip->capture_period = 0;
411 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
413 /* assign channels to AC97C channel A */
414 switch (runtime->channels) {
416 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
419 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
420 | AC97C_CH_ASSIGN(PCM_RIGHT, A);
423 /* TODO: support more than two channels */
426 ac97c_writel(chip, ICA, word);
428 /* configure sample format and size */
429 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
431 switch (runtime->format) {
432 case SNDRV_PCM_FORMAT_S16_LE:
433 if (cpu_is_at32ap7000())
434 word |= AC97C_CMR_CEM_LITTLE;
436 case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
437 word &= ~(AC97C_CMR_CEM_LITTLE);
440 word = ac97c_readl(chip, ICA);
441 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
442 ac97c_writel(chip, ICA, word);
446 /* Enable overrun interrupt on channel A */
447 word |= AC97C_CSR_OVRUN;
449 ac97c_writel(chip, CAMR, word);
451 /* Enable channel A event interrupt */
452 word = ac97c_readl(chip, IMR);
453 word |= AC97C_SR_CAEVT;
454 ac97c_writel(chip, IER, word);
456 /* set variable rate if needed */
457 if (runtime->rate != 48000) {
458 word = ac97c_readl(chip, MR);
459 word |= AC97C_MR_VRA;
460 ac97c_writel(chip, MR, word);
462 word = ac97c_readl(chip, MR);
463 word &= ~(AC97C_MR_VRA);
464 ac97c_writel(chip, MR, word);
467 retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE,
470 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
473 if (cpu_is_at32ap7000()) {
474 if (!test_bit(DMA_RX_READY, &chip->flags))
475 retval = atmel_ac97c_prepare_dma(chip, substream,
478 /* Initialize and start the PDC */
479 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR);
480 writel(block_size / 2, chip->regs + ATMEL_PDC_RCR);
481 writel(runtime->dma_addr + block_size,
482 chip->regs + ATMEL_PDC_RNPR);
483 writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR);
490 atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
492 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
493 unsigned long camr, ptcr = 0;
496 camr = ac97c_readl(chip, CAMR);
499 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
500 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
501 case SNDRV_PCM_TRIGGER_START:
502 if (cpu_is_at32ap7000()) {
503 retval = dw_dma_cyclic_start(chip->dma.tx_chan);
507 ptcr = ATMEL_PDC_TXTEN;
509 camr |= AC97C_CMR_CENA;
511 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
512 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
513 case SNDRV_PCM_TRIGGER_STOP:
514 if (cpu_is_at32ap7000())
515 dw_dma_cyclic_stop(chip->dma.tx_chan);
517 ptcr |= ATMEL_PDC_TXTDIS;
518 if (chip->opened <= 1)
519 camr &= ~AC97C_CMR_CENA;
526 ac97c_writel(chip, CAMR, camr);
527 if (!cpu_is_at32ap7000())
528 writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
534 atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
536 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
537 unsigned long camr, ptcr = 0;
540 camr = ac97c_readl(chip, CAMR);
541 ptcr = readl(chip->regs + ATMEL_PDC_PTSR);
544 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
545 case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
546 case SNDRV_PCM_TRIGGER_START:
547 if (cpu_is_at32ap7000()) {
548 retval = dw_dma_cyclic_start(chip->dma.rx_chan);
552 ptcr = ATMEL_PDC_RXTEN;
554 camr |= AC97C_CMR_CENA;
556 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
557 case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
558 case SNDRV_PCM_TRIGGER_STOP:
559 if (cpu_is_at32ap7000())
560 dw_dma_cyclic_stop(chip->dma.rx_chan);
562 ptcr |= (ATMEL_PDC_RXTDIS);
563 if (chip->opened <= 1)
564 camr &= ~AC97C_CMR_CENA;
571 ac97c_writel(chip, CAMR, camr);
572 if (!cpu_is_at32ap7000())
573 writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
578 static snd_pcm_uframes_t
579 atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream)
581 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
582 struct snd_pcm_runtime *runtime = substream->runtime;
583 snd_pcm_uframes_t frames;
586 if (cpu_is_at32ap7000())
587 bytes = dw_dma_get_src_addr(chip->dma.tx_chan);
589 bytes = readl(chip->regs + ATMEL_PDC_TPR);
590 bytes -= runtime->dma_addr;
592 frames = bytes_to_frames(runtime, bytes);
593 if (frames >= runtime->buffer_size)
594 frames -= runtime->buffer_size;
598 static snd_pcm_uframes_t
599 atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream)
601 struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
602 struct snd_pcm_runtime *runtime = substream->runtime;
603 snd_pcm_uframes_t frames;
606 if (cpu_is_at32ap7000())
607 bytes = dw_dma_get_dst_addr(chip->dma.rx_chan);
609 bytes = readl(chip->regs + ATMEL_PDC_RPR);
610 bytes -= runtime->dma_addr;
612 frames = bytes_to_frames(runtime, bytes);
613 if (frames >= runtime->buffer_size)
614 frames -= runtime->buffer_size;
618 static struct snd_pcm_ops atmel_ac97_playback_ops = {
619 .open = atmel_ac97c_playback_open,
620 .close = atmel_ac97c_playback_close,
621 .ioctl = snd_pcm_lib_ioctl,
622 .hw_params = atmel_ac97c_playback_hw_params,
623 .hw_free = atmel_ac97c_playback_hw_free,
624 .prepare = atmel_ac97c_playback_prepare,
625 .trigger = atmel_ac97c_playback_trigger,
626 .pointer = atmel_ac97c_playback_pointer,
629 static struct snd_pcm_ops atmel_ac97_capture_ops = {
630 .open = atmel_ac97c_capture_open,
631 .close = atmel_ac97c_capture_close,
632 .ioctl = snd_pcm_lib_ioctl,
633 .hw_params = atmel_ac97c_capture_hw_params,
634 .hw_free = atmel_ac97c_capture_hw_free,
635 .prepare = atmel_ac97c_capture_prepare,
636 .trigger = atmel_ac97c_capture_trigger,
637 .pointer = atmel_ac97c_capture_pointer,
640 static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
642 struct atmel_ac97c *chip = (struct atmel_ac97c *)dev;
643 irqreturn_t retval = IRQ_NONE;
644 u32 sr = ac97c_readl(chip, SR);
645 u32 casr = ac97c_readl(chip, CASR);
646 u32 cosr = ac97c_readl(chip, COSR);
647 u32 camr = ac97c_readl(chip, CAMR);
649 if (sr & AC97C_SR_CAEVT) {
650 struct snd_pcm_runtime *runtime;
651 int offset, next_period, block_size;
652 dev_info(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n",
653 casr & AC97C_CSR_OVRUN ? " OVRUN" : "",
654 casr & AC97C_CSR_RXRDY ? " RXRDY" : "",
655 casr & AC97C_CSR_UNRUN ? " UNRUN" : "",
656 casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
657 casr & AC97C_CSR_TXRDY ? " TXRDY" : "",
658 !casr ? " NONE" : "");
659 if (!cpu_is_at32ap7000()) {
660 if ((casr & camr) & AC97C_CSR_ENDTX) {
661 runtime = chip->playback_substream->runtime;
662 block_size = frames_to_bytes(runtime,
663 runtime->period_size);
664 chip->playback_period++;
666 if (chip->playback_period == runtime->periods)
667 chip->playback_period = 0;
668 next_period = chip->playback_period + 1;
669 if (next_period == runtime->periods)
672 offset = block_size * next_period;
674 writel(runtime->dma_addr + offset,
675 chip->regs + ATMEL_PDC_TNPR);
676 writel(block_size / 2,
677 chip->regs + ATMEL_PDC_TNCR);
679 snd_pcm_period_elapsed(
680 chip->playback_substream);
682 if ((casr & camr) & AC97C_CSR_ENDRX) {
683 runtime = chip->capture_substream->runtime;
684 block_size = frames_to_bytes(runtime,
685 runtime->period_size);
686 chip->capture_period++;
688 if (chip->capture_period == runtime->periods)
689 chip->capture_period = 0;
690 next_period = chip->capture_period + 1;
691 if (next_period == runtime->periods)
694 offset = block_size * next_period;
696 writel(runtime->dma_addr + offset,
697 chip->regs + ATMEL_PDC_RNPR);
698 writel(block_size / 2,
699 chip->regs + ATMEL_PDC_RNCR);
700 snd_pcm_period_elapsed(chip->capture_substream);
703 retval = IRQ_HANDLED;
706 if (sr & AC97C_SR_COEVT) {
707 dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n",
708 cosr & AC97C_CSR_OVRUN ? " OVRUN" : "",
709 cosr & AC97C_CSR_RXRDY ? " RXRDY" : "",
710 cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
711 cosr & AC97C_CSR_TXRDY ? " TXRDY" : "",
712 !cosr ? " NONE" : "");
713 retval = IRQ_HANDLED;
716 if (retval == IRQ_NONE) {
717 dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x "
718 "casr 0x%08x cosr 0x%08x\n", sr, casr, cosr);
724 static struct ac97_pcm at91_ac97_pcm_defs[] __devinitdata = {
729 .slots = ((1 << AC97_SLOT_PCM_LEFT)
730 | (1 << AC97_SLOT_PCM_RIGHT)),
738 .slots = ((1 << AC97_SLOT_PCM_LEFT)
739 | (1 << AC97_SLOT_PCM_RIGHT)),
747 .slots = (1<<AC97_SLOT_MIC),
752 static int __devinit atmel_ac97c_pcm_new(struct atmel_ac97c *chip)
755 struct snd_pcm_hardware hw = atmel_ac97c_hw;
756 int capture, playback, retval, err;
758 capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
759 playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
761 if (!cpu_is_at32ap7000()) {
762 err = snd_ac97_pcm_assign(chip->ac97_bus,
763 ARRAY_SIZE(at91_ac97_pcm_defs),
768 retval = snd_pcm_new(chip->card, chip->card->shortname,
769 chip->pdev->id, playback, capture, &pcm);
774 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
775 &atmel_ac97_capture_ops);
777 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
778 &atmel_ac97_playback_ops);
780 retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
781 &chip->pdev->dev, hw.periods_min * hw.period_bytes_min,
782 hw.buffer_bytes_max);
786 pcm->private_data = chip;
788 strcpy(pcm->name, chip->card->shortname);
794 static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip)
796 struct snd_ac97_template template;
797 memset(&template, 0, sizeof(template));
798 template.private_data = chip;
799 return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97);
802 static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg,
805 struct atmel_ac97c *chip = get_chip(ac97);
809 word = (reg & 0x7f) << 16 | val;
812 if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) {
813 ac97c_writel(chip, COTHR, word);
819 dev_dbg(&chip->pdev->dev, "codec write timeout\n");
822 static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97,
825 struct atmel_ac97c *chip = get_chip(ac97);
830 word = (0x80 | (reg & 0x7f)) << 16;
832 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0)
833 ac97c_readl(chip, CORHR);
839 if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) {
840 ac97c_writel(chip, COTHR, word);
852 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) {
853 unsigned short val = ac97c_readl(chip, CORHR);
864 dev_dbg(&chip->pdev->dev, "codec read timeout\n");
868 static bool filter(struct dma_chan *chan, void *slave)
870 struct dw_dma_slave *dws = slave;
872 if (dws->dma_dev == chan->device->dev) {
879 static void atmel_ac97c_reset(struct atmel_ac97c *chip)
881 ac97c_writel(chip, MR, 0);
882 ac97c_writel(chip, MR, AC97C_MR_ENA);
883 ac97c_writel(chip, CAMR, 0);
884 ac97c_writel(chip, COMR, 0);
886 if (gpio_is_valid(chip->reset_pin)) {
887 gpio_set_value(chip->reset_pin, 0);
888 /* AC97 v2.2 specifications says minimum 1 us. */
890 gpio_set_value(chip->reset_pin, 1);
894 static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
896 struct snd_card *card;
897 struct atmel_ac97c *chip;
898 struct resource *regs;
899 struct ac97c_platform_data *pdata;
901 static struct snd_ac97_bus_ops ops = {
902 .write = atmel_ac97c_write,
903 .read = atmel_ac97c_read,
908 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
910 dev_dbg(&pdev->dev, "no memory resource\n");
914 pdata = pdev->dev.platform_data;
916 dev_dbg(&pdev->dev, "no platform data\n");
920 irq = platform_get_irq(pdev, 0);
922 dev_dbg(&pdev->dev, "could not get irq\n");
926 if (cpu_is_at32ap7000()) {
927 pclk = clk_get(&pdev->dev, "pclk");
929 pclk = clk_get(&pdev->dev, "ac97_clk");
933 dev_dbg(&pdev->dev, "no peripheral clock\n");
934 return PTR_ERR(pclk);
938 retval = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
939 THIS_MODULE, sizeof(struct atmel_ac97c), &card);
941 dev_dbg(&pdev->dev, "could not create sound card device\n");
942 goto err_snd_card_new;
945 chip = get_chip(card);
947 retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip);
949 dev_dbg(&pdev->dev, "unable to request irq %d\n", irq);
950 goto err_request_irq;
954 spin_lock_init(&chip->lock);
956 strcpy(card->driver, "Atmel AC97C");
957 strcpy(card->shortname, "Atmel AC97C");
958 sprintf(card->longname, "Atmel AC97 controller");
963 chip->regs = ioremap(regs->start, regs->end - regs->start + 1);
966 dev_dbg(&pdev->dev, "could not remap register memory\n");
970 if (gpio_is_valid(pdata->reset_pin)) {
971 if (gpio_request(pdata->reset_pin, "reset_pin")) {
972 dev_dbg(&pdev->dev, "reset pin not available\n");
973 chip->reset_pin = -ENODEV;
975 gpio_direction_output(pdata->reset_pin, 1);
976 chip->reset_pin = pdata->reset_pin;
980 snd_card_set_dev(card, &pdev->dev);
982 atmel_ac97c_reset(chip);
984 /* Enable overrun interrupt from codec channel */
985 ac97c_writel(chip, COMR, AC97C_CSR_OVRUN);
986 ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT);
988 retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus);
990 dev_dbg(&pdev->dev, "could not register on ac97 bus\n");
994 retval = atmel_ac97c_mixer_new(chip);
996 dev_dbg(&pdev->dev, "could not register ac97 mixer\n");
1000 if (cpu_is_at32ap7000()) {
1001 if (pdata->rx_dws.dma_dev) {
1002 struct dw_dma_slave *dws = &pdata->rx_dws;
1003 dma_cap_mask_t mask;
1005 dws->rx_reg = regs->start + AC97C_CARHR + 2;
1008 dma_cap_set(DMA_SLAVE, mask);
1010 chip->dma.rx_chan = dma_request_channel(mask, filter,
1013 dev_info(&chip->pdev->dev, "using %s for DMA RX\n",
1014 dev_name(&chip->dma.rx_chan->dev->device));
1015 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1018 if (pdata->tx_dws.dma_dev) {
1019 struct dw_dma_slave *dws = &pdata->tx_dws;
1020 dma_cap_mask_t mask;
1022 dws->tx_reg = regs->start + AC97C_CATHR + 2;
1025 dma_cap_set(DMA_SLAVE, mask);
1027 chip->dma.tx_chan = dma_request_channel(mask, filter,
1030 dev_info(&chip->pdev->dev, "using %s for DMA TX\n",
1031 dev_name(&chip->dma.tx_chan->dev->device));
1032 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1035 if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) &&
1036 !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) {
1037 dev_dbg(&pdev->dev, "DMA not available\n");
1042 /* Just pretend that we have DMA channel(for at91 i is actually
1044 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1045 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1048 retval = atmel_ac97c_pcm_new(chip);
1050 dev_dbg(&pdev->dev, "could not register ac97 pcm device\n");
1054 retval = snd_card_register(card);
1056 dev_dbg(&pdev->dev, "could not register sound card\n");
1060 platform_set_drvdata(pdev, card);
1062 dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n",
1068 if (cpu_is_at32ap7000()) {
1069 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1070 dma_release_channel(chip->dma.rx_chan);
1071 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1072 dma_release_channel(chip->dma.tx_chan);
1073 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1074 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1075 chip->dma.rx_chan = NULL;
1076 chip->dma.tx_chan = NULL;
1079 snd_card_set_dev(card, NULL);
1081 if (gpio_is_valid(chip->reset_pin))
1082 gpio_free(chip->reset_pin);
1084 iounmap(chip->regs);
1086 free_irq(irq, chip);
1088 snd_card_free(card);
1096 static int atmel_ac97c_suspend(struct platform_device *pdev, pm_message_t msg)
1098 struct snd_card *card = platform_get_drvdata(pdev);
1099 struct atmel_ac97c *chip = card->private_data;
1101 if (cpu_is_at32ap7000()) {
1102 if (test_bit(DMA_RX_READY, &chip->flags))
1103 dw_dma_cyclic_stop(chip->dma.rx_chan);
1104 if (test_bit(DMA_TX_READY, &chip->flags))
1105 dw_dma_cyclic_stop(chip->dma.tx_chan);
1107 clk_disable(chip->pclk);
1112 static int atmel_ac97c_resume(struct platform_device *pdev)
1114 struct snd_card *card = platform_get_drvdata(pdev);
1115 struct atmel_ac97c *chip = card->private_data;
1117 clk_enable(chip->pclk);
1118 if (cpu_is_at32ap7000()) {
1119 if (test_bit(DMA_RX_READY, &chip->flags))
1120 dw_dma_cyclic_start(chip->dma.rx_chan);
1121 if (test_bit(DMA_TX_READY, &chip->flags))
1122 dw_dma_cyclic_start(chip->dma.tx_chan);
1127 #define atmel_ac97c_suspend NULL
1128 #define atmel_ac97c_resume NULL
1131 static int __devexit atmel_ac97c_remove(struct platform_device *pdev)
1133 struct snd_card *card = platform_get_drvdata(pdev);
1134 struct atmel_ac97c *chip = get_chip(card);
1136 if (gpio_is_valid(chip->reset_pin))
1137 gpio_free(chip->reset_pin);
1139 ac97c_writel(chip, CAMR, 0);
1140 ac97c_writel(chip, COMR, 0);
1141 ac97c_writel(chip, MR, 0);
1143 clk_disable(chip->pclk);
1144 clk_put(chip->pclk);
1145 iounmap(chip->regs);
1146 free_irq(chip->irq, chip);
1148 if (cpu_is_at32ap7000()) {
1149 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1150 dma_release_channel(chip->dma.rx_chan);
1151 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1152 dma_release_channel(chip->dma.tx_chan);
1153 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1154 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1155 chip->dma.rx_chan = NULL;
1156 chip->dma.tx_chan = NULL;
1159 snd_card_set_dev(card, NULL);
1160 snd_card_free(card);
1162 platform_set_drvdata(pdev, NULL);
1167 static struct platform_driver atmel_ac97c_driver = {
1168 .remove = __devexit_p(atmel_ac97c_remove),
1170 .name = "atmel_ac97c",
1172 .suspend = atmel_ac97c_suspend,
1173 .resume = atmel_ac97c_resume,
1176 static int __init atmel_ac97c_init(void)
1178 return platform_driver_probe(&atmel_ac97c_driver,
1181 module_init(atmel_ac97c_init);
1183 static void __exit atmel_ac97c_exit(void)
1185 platform_driver_unregister(&atmel_ac97c_driver);
1187 module_exit(atmel_ac97c_exit);
1189 MODULE_LICENSE("GPL");
1190 MODULE_DESCRIPTION("Driver for Atmel AC97 controller");
1191 MODULE_AUTHOR("Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>");