1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/sound/arm/aaci.c - ARM PrimeCell AACI PL041 driver
5 * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
7 * Documentation: ARM DDI 0173B
9 #include <linux/module.h>
10 #include <linux/delay.h>
11 #include <linux/init.h>
12 #include <linux/ioport.h>
13 #include <linux/device.h>
14 #include <linux/spinlock.h>
15 #include <linux/interrupt.h>
16 #include <linux/err.h>
17 #include <linux/amba/bus.h>
20 #include <sound/core.h>
21 #include <sound/initval.h>
22 #include <sound/ac97_codec.h>
23 #include <sound/pcm.h>
24 #include <sound/pcm_params.h>
28 #define DRIVER_NAME "aaci-pl041"
30 #define FRAME_PERIOD_US 21
33 * PM support is not complete. Turn it off.
37 static void aaci_ac97_select_codec(struct aaci *aaci, struct snd_ac97 *ac97)
39 u32 v, maincr = aaci->maincr | MAINCR_SCRA(ac97->num);
42 * Ensure that the slot 1/2 RX registers are empty.
44 v = readl(aaci->base + AACI_SLFR);
46 readl(aaci->base + AACI_SL2RX);
48 readl(aaci->base + AACI_SL1RX);
50 if (maincr != readl(aaci->base + AACI_MAINCR)) {
51 writel(maincr, aaci->base + AACI_MAINCR);
52 readl(aaci->base + AACI_MAINCR);
59 * The recommended use of programming the external codec through slot 1
60 * and slot 2 data is to use the channels during setup routines and the
61 * slot register at any other time. The data written into slot 1, slot 2
62 * and slot 12 registers is transmitted only when their corresponding
63 * SI1TxEn, SI2TxEn and SI12TxEn bits are set in the AACI_MAINCR
66 static void aaci_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
69 struct aaci *aaci = ac97->private_data;
76 mutex_lock(&aaci->ac97_sem);
78 aaci_ac97_select_codec(aaci, ac97);
81 * P54: You must ensure that AACI_SL2TX is always written
82 * to, if required, before data is written to AACI_SL1TX.
84 writel(val << 4, aaci->base + AACI_SL2TX);
85 writel(reg << 12, aaci->base + AACI_SL1TX);
87 /* Initially, wait one frame period */
88 udelay(FRAME_PERIOD_US);
90 /* And then wait an additional eight frame periods for it to be sent */
91 timeout = FRAME_PERIOD_US * 8;
94 v = readl(aaci->base + AACI_SLFR);
95 } while ((v & (SLFR_1TXB|SLFR_2TXB)) && --timeout);
97 if (v & (SLFR_1TXB|SLFR_2TXB))
98 dev_err(&aaci->dev->dev,
99 "timeout waiting for write to complete\n");
101 mutex_unlock(&aaci->ac97_sem);
105 * Read an AC'97 register.
107 static unsigned short aaci_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
109 struct aaci *aaci = ac97->private_data;
110 int timeout, retries = 10;
116 mutex_lock(&aaci->ac97_sem);
118 aaci_ac97_select_codec(aaci, ac97);
121 * Write the register address to slot 1.
123 writel((reg << 12) | (1 << 19), aaci->base + AACI_SL1TX);
125 /* Initially, wait one frame period */
126 udelay(FRAME_PERIOD_US);
128 /* And then wait an additional eight frame periods for it to be sent */
129 timeout = FRAME_PERIOD_US * 8;
132 v = readl(aaci->base + AACI_SLFR);
133 } while ((v & SLFR_1TXB) && --timeout);
136 dev_err(&aaci->dev->dev, "timeout on slot 1 TX busy\n");
141 /* Now wait for the response frame */
142 udelay(FRAME_PERIOD_US);
144 /* And then wait an additional eight frame periods for data */
145 timeout = FRAME_PERIOD_US * 8;
149 v = readl(aaci->base + AACI_SLFR) & (SLFR_1RXV|SLFR_2RXV);
150 } while ((v != (SLFR_1RXV|SLFR_2RXV)) && --timeout);
152 if (v != (SLFR_1RXV|SLFR_2RXV)) {
153 dev_err(&aaci->dev->dev, "timeout on RX valid\n");
159 v = readl(aaci->base + AACI_SL1RX) >> 12;
161 v = readl(aaci->base + AACI_SL2RX) >> 4;
163 } else if (--retries) {
164 dev_warn(&aaci->dev->dev,
165 "ac97 read back fail. retry\n");
168 dev_warn(&aaci->dev->dev,
169 "wrong ac97 register read back (%x != %x)\n",
175 mutex_unlock(&aaci->ac97_sem);
180 aaci_chan_wait_ready(struct aaci_runtime *aacirun, unsigned long mask)
187 val = readl(aacirun->base + AACI_SR);
188 } while (val & mask && timeout--);
196 static void aaci_fifo_irq(struct aaci *aaci, int channel, u32 mask)
198 if (mask & ISR_ORINTR) {
199 dev_warn(&aaci->dev->dev, "RX overrun on chan %d\n", channel);
200 writel(ICLR_RXOEC1 << channel, aaci->base + AACI_INTCLR);
203 if (mask & ISR_RXTOINTR) {
204 dev_warn(&aaci->dev->dev, "RX timeout on chan %d\n", channel);
205 writel(ICLR_RXTOFEC1 << channel, aaci->base + AACI_INTCLR);
208 if (mask & ISR_RXINTR) {
209 struct aaci_runtime *aacirun = &aaci->capture;
210 bool period_elapsed = false;
213 if (!aacirun->substream || !aacirun->start) {
214 dev_warn(&aaci->dev->dev, "RX interrupt???\n");
215 writel(0, aacirun->base + AACI_IE);
219 spin_lock(&aacirun->lock);
223 unsigned int len = aacirun->fifo_bytes;
226 if (aacirun->bytes <= 0) {
227 aacirun->bytes += aacirun->period;
228 period_elapsed = true;
230 if (!(aacirun->cr & CR_EN))
233 val = readl(aacirun->base + AACI_SR);
234 if (!(val & SR_RXHF))
236 if (!(val & SR_RXFF))
239 aacirun->bytes -= len;
241 /* reading 16 bytes at a time */
242 for( ; len > 0; len -= 16) {
244 "ldmia %1, {r0, r1, r2, r3}\n\t"
245 "stmia %0!, {r0, r1, r2, r3}"
247 : "r" (aacirun->fifo)
248 : "r0", "r1", "r2", "r3", "cc");
250 if (ptr >= aacirun->end)
251 ptr = aacirun->start;
257 spin_unlock(&aacirun->lock);
260 snd_pcm_period_elapsed(aacirun->substream);
263 if (mask & ISR_URINTR) {
264 dev_dbg(&aaci->dev->dev, "TX underrun on chan %d\n", channel);
265 writel(ICLR_TXUEC1 << channel, aaci->base + AACI_INTCLR);
268 if (mask & ISR_TXINTR) {
269 struct aaci_runtime *aacirun = &aaci->playback;
270 bool period_elapsed = false;
273 if (!aacirun->substream || !aacirun->start) {
274 dev_warn(&aaci->dev->dev, "TX interrupt???\n");
275 writel(0, aacirun->base + AACI_IE);
279 spin_lock(&aacirun->lock);
283 unsigned int len = aacirun->fifo_bytes;
286 if (aacirun->bytes <= 0) {
287 aacirun->bytes += aacirun->period;
288 period_elapsed = true;
290 if (!(aacirun->cr & CR_EN))
293 val = readl(aacirun->base + AACI_SR);
294 if (!(val & SR_TXHE))
296 if (!(val & SR_TXFE))
299 aacirun->bytes -= len;
301 /* writing 16 bytes at a time */
302 for ( ; len > 0; len -= 16) {
304 "ldmia %0!, {r0, r1, r2, r3}\n\t"
305 "stmia %1, {r0, r1, r2, r3}"
307 : "r" (aacirun->fifo)
308 : "r0", "r1", "r2", "r3", "cc");
310 if (ptr >= aacirun->end)
311 ptr = aacirun->start;
317 spin_unlock(&aacirun->lock);
320 snd_pcm_period_elapsed(aacirun->substream);
324 static irqreturn_t aaci_irq(int irq, void *devid)
326 struct aaci *aaci = devid;
330 mask = readl(aaci->base + AACI_ALLINTS);
333 for (i = 0; i < 4; i++, m >>= 7) {
335 aaci_fifo_irq(aaci, i, m);
340 return mask ? IRQ_HANDLED : IRQ_NONE;
348 static const struct snd_pcm_hardware aaci_hw_info = {
349 .info = SNDRV_PCM_INFO_MMAP |
350 SNDRV_PCM_INFO_MMAP_VALID |
351 SNDRV_PCM_INFO_INTERLEAVED |
352 SNDRV_PCM_INFO_BLOCK_TRANSFER |
353 SNDRV_PCM_INFO_RESUME,
356 * ALSA doesn't support 18-bit or 20-bit packed into 32-bit
357 * words. It also doesn't support 12-bit at all.
359 .formats = SNDRV_PCM_FMTBIT_S16_LE,
361 /* rates are setup from the AC'97 codec */
364 .buffer_bytes_max = 64 * 1024,
365 .period_bytes_min = 256,
366 .period_bytes_max = PAGE_SIZE,
368 .periods_max = PAGE_SIZE / 16,
372 * We can support two and four channel audio. Unfortunately
373 * six channel audio requires a non-standard channel ordering:
375 * 4 -> FL(3), FR(4), SL(7), SR(8)
376 * 6 -> FL(3), FR(4), SL(7), SR(8), C(6), LFE(9) (required)
377 * FL(3), FR(4), C(6), SL(7), SR(8), LFE(9) (actual)
378 * This requires an ALSA configuration file to correct.
380 static int aaci_rule_channels(struct snd_pcm_hw_params *p,
381 struct snd_pcm_hw_rule *rule)
383 static const unsigned int channel_list[] = { 2, 4, 6 };
384 struct aaci *aaci = rule->private;
385 unsigned int mask = 1 << 0, slots;
387 /* pcms[0] is the our 5.1 PCM instance. */
388 slots = aaci->ac97_bus->pcms[0].r[0].slots;
389 if (slots & (1 << AC97_SLOT_PCM_SLEFT)) {
391 if (slots & (1 << AC97_SLOT_LFE))
395 return snd_interval_list(hw_param_interval(p, rule->var),
396 ARRAY_SIZE(channel_list), channel_list, mask);
399 static int aaci_pcm_open(struct snd_pcm_substream *substream)
401 struct snd_pcm_runtime *runtime = substream->runtime;
402 struct aaci *aaci = substream->private_data;
403 struct aaci_runtime *aacirun;
406 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
407 aacirun = &aaci->playback;
409 aacirun = &aaci->capture;
412 aacirun->substream = substream;
413 runtime->private_data = aacirun;
414 runtime->hw = aaci_hw_info;
415 runtime->hw.rates = aacirun->pcm->rates;
416 snd_pcm_limit_hw_rates(runtime);
418 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
419 runtime->hw.channels_max = 6;
421 /* Add rule describing channel dependency. */
422 ret = snd_pcm_hw_rule_add(substream->runtime, 0,
423 SNDRV_PCM_HW_PARAM_CHANNELS,
424 aaci_rule_channels, aaci,
425 SNDRV_PCM_HW_PARAM_CHANNELS, -1);
429 if (aacirun->pcm->r[1].slots)
430 snd_ac97_pcm_double_rate_rules(runtime);
434 * ALSA wants the byte-size of the FIFOs. As we only support
435 * 16-bit samples, this is twice the FIFO depth irrespective
436 * of whether it's in compact mode or not.
438 runtime->hw.fifo_size = aaci->fifo_depth * 2;
440 mutex_lock(&aaci->irq_lock);
441 if (!aaci->users++) {
442 ret = request_irq(aaci->dev->irq[0], aaci_irq,
443 IRQF_SHARED, DRIVER_NAME, aaci);
447 mutex_unlock(&aaci->irq_lock);
456 static int aaci_pcm_close(struct snd_pcm_substream *substream)
458 struct aaci *aaci = substream->private_data;
459 struct aaci_runtime *aacirun = substream->runtime->private_data;
461 WARN_ON(aacirun->cr & CR_EN);
463 aacirun->substream = NULL;
465 mutex_lock(&aaci->irq_lock);
467 free_irq(aaci->dev->irq[0], aaci);
468 mutex_unlock(&aaci->irq_lock);
473 static int aaci_pcm_hw_free(struct snd_pcm_substream *substream)
475 struct aaci_runtime *aacirun = substream->runtime->private_data;
478 * This must not be called with the device enabled.
480 WARN_ON(aacirun->cr & CR_EN);
482 if (aacirun->pcm_open)
483 snd_ac97_pcm_close(aacirun->pcm);
484 aacirun->pcm_open = 0;
489 /* Channel to slot mask */
490 static const u32 channels_to_slotmask[] = {
491 [2] = CR_SL3 | CR_SL4,
492 [4] = CR_SL3 | CR_SL4 | CR_SL7 | CR_SL8,
493 [6] = CR_SL3 | CR_SL4 | CR_SL7 | CR_SL8 | CR_SL6 | CR_SL9,
496 static int aaci_pcm_hw_params(struct snd_pcm_substream *substream,
497 struct snd_pcm_hw_params *params)
499 struct aaci_runtime *aacirun = substream->runtime->private_data;
500 struct aaci *aaci = substream->private_data;
501 unsigned int channels = params_channels(params);
502 unsigned int rate = params_rate(params);
503 int dbl = rate > 48000;
506 aaci_pcm_hw_free(substream);
507 if (aacirun->pcm_open) {
508 snd_ac97_pcm_close(aacirun->pcm);
509 aacirun->pcm_open = 0;
512 /* channels is already limited to 2, 4, or 6 by aaci_rule_channels */
513 if (dbl && channels != 2)
516 err = snd_ac97_pcm_open(aacirun->pcm, rate, channels,
517 aacirun->pcm->r[dbl].slots);
519 aacirun->pcm_open = err == 0;
520 aacirun->cr = CR_FEN | CR_COMPACT | CR_SZ16;
521 aacirun->cr |= channels_to_slotmask[channels + dbl * 2];
524 * fifo_bytes is the number of bytes we transfer to/from
525 * the FIFO, including padding. So that's x4. As we're
526 * in compact mode, the FIFO is half the size.
528 aacirun->fifo_bytes = aaci->fifo_depth * 4 / 2;
533 static int aaci_pcm_prepare(struct snd_pcm_substream *substream)
535 struct snd_pcm_runtime *runtime = substream->runtime;
536 struct aaci_runtime *aacirun = runtime->private_data;
538 aacirun->period = snd_pcm_lib_period_bytes(substream);
539 aacirun->start = runtime->dma_area;
540 aacirun->end = aacirun->start + snd_pcm_lib_buffer_bytes(substream);
541 aacirun->ptr = aacirun->start;
542 aacirun->bytes = aacirun->period;
547 static snd_pcm_uframes_t aaci_pcm_pointer(struct snd_pcm_substream *substream)
549 struct snd_pcm_runtime *runtime = substream->runtime;
550 struct aaci_runtime *aacirun = runtime->private_data;
551 ssize_t bytes = aacirun->ptr - aacirun->start;
553 return bytes_to_frames(runtime, bytes);
558 * Playback specific ALSA stuff
560 static void aaci_pcm_playback_stop(struct aaci_runtime *aacirun)
564 ie = readl(aacirun->base + AACI_IE);
565 ie &= ~(IE_URIE|IE_TXIE);
566 writel(ie, aacirun->base + AACI_IE);
567 aacirun->cr &= ~CR_EN;
568 aaci_chan_wait_ready(aacirun, SR_TXB);
569 writel(aacirun->cr, aacirun->base + AACI_TXCR);
572 static void aaci_pcm_playback_start(struct aaci_runtime *aacirun)
576 aaci_chan_wait_ready(aacirun, SR_TXB);
577 aacirun->cr |= CR_EN;
579 ie = readl(aacirun->base + AACI_IE);
580 ie |= IE_URIE | IE_TXIE;
581 writel(ie, aacirun->base + AACI_IE);
582 writel(aacirun->cr, aacirun->base + AACI_TXCR);
585 static int aaci_pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
587 struct aaci_runtime *aacirun = substream->runtime->private_data;
591 spin_lock_irqsave(&aacirun->lock, flags);
594 case SNDRV_PCM_TRIGGER_START:
595 aaci_pcm_playback_start(aacirun);
598 case SNDRV_PCM_TRIGGER_RESUME:
599 aaci_pcm_playback_start(aacirun);
602 case SNDRV_PCM_TRIGGER_STOP:
603 aaci_pcm_playback_stop(aacirun);
606 case SNDRV_PCM_TRIGGER_SUSPEND:
607 aaci_pcm_playback_stop(aacirun);
610 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
613 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
620 spin_unlock_irqrestore(&aacirun->lock, flags);
625 static const struct snd_pcm_ops aaci_playback_ops = {
626 .open = aaci_pcm_open,
627 .close = aaci_pcm_close,
628 .hw_params = aaci_pcm_hw_params,
629 .hw_free = aaci_pcm_hw_free,
630 .prepare = aaci_pcm_prepare,
631 .trigger = aaci_pcm_playback_trigger,
632 .pointer = aaci_pcm_pointer,
635 static void aaci_pcm_capture_stop(struct aaci_runtime *aacirun)
639 aaci_chan_wait_ready(aacirun, SR_RXB);
641 ie = readl(aacirun->base + AACI_IE);
642 ie &= ~(IE_ORIE | IE_RXIE);
643 writel(ie, aacirun->base+AACI_IE);
645 aacirun->cr &= ~CR_EN;
647 writel(aacirun->cr, aacirun->base + AACI_RXCR);
650 static void aaci_pcm_capture_start(struct aaci_runtime *aacirun)
654 aaci_chan_wait_ready(aacirun, SR_RXB);
657 /* RX Timeout value: bits 28:17 in RXCR */
658 aacirun->cr |= 0xf << 17;
661 aacirun->cr |= CR_EN;
662 writel(aacirun->cr, aacirun->base + AACI_RXCR);
664 ie = readl(aacirun->base + AACI_IE);
665 ie |= IE_ORIE |IE_RXIE; // overrun and rx interrupt -- half full
666 writel(ie, aacirun->base + AACI_IE);
669 static int aaci_pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
671 struct aaci_runtime *aacirun = substream->runtime->private_data;
675 spin_lock_irqsave(&aacirun->lock, flags);
678 case SNDRV_PCM_TRIGGER_START:
679 aaci_pcm_capture_start(aacirun);
682 case SNDRV_PCM_TRIGGER_RESUME:
683 aaci_pcm_capture_start(aacirun);
686 case SNDRV_PCM_TRIGGER_STOP:
687 aaci_pcm_capture_stop(aacirun);
690 case SNDRV_PCM_TRIGGER_SUSPEND:
691 aaci_pcm_capture_stop(aacirun);
694 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
697 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
704 spin_unlock_irqrestore(&aacirun->lock, flags);
709 static int aaci_pcm_capture_prepare(struct snd_pcm_substream *substream)
711 struct snd_pcm_runtime *runtime = substream->runtime;
712 struct aaci *aaci = substream->private_data;
714 aaci_pcm_prepare(substream);
716 /* allow changing of sample rate */
717 aaci_ac97_write(aaci->ac97, AC97_EXTENDED_STATUS, 0x0001); /* VRA */
718 aaci_ac97_write(aaci->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
719 aaci_ac97_write(aaci->ac97, AC97_PCM_MIC_ADC_RATE, runtime->rate);
721 /* Record select: Mic: 0, Aux: 3, Line: 4 */
722 aaci_ac97_write(aaci->ac97, AC97_REC_SEL, 0x0404);
727 static const struct snd_pcm_ops aaci_capture_ops = {
728 .open = aaci_pcm_open,
729 .close = aaci_pcm_close,
730 .hw_params = aaci_pcm_hw_params,
731 .hw_free = aaci_pcm_hw_free,
732 .prepare = aaci_pcm_capture_prepare,
733 .trigger = aaci_pcm_capture_trigger,
734 .pointer = aaci_pcm_pointer,
741 static int aaci_do_suspend(struct snd_card *card)
743 struct aaci *aaci = card->private_data;
744 snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
748 static int aaci_do_resume(struct snd_card *card)
750 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
754 static int aaci_suspend(struct device *dev)
756 struct snd_card *card = dev_get_drvdata(dev);
757 return card ? aaci_do_suspend(card) : 0;
760 static int aaci_resume(struct device *dev)
762 struct snd_card *card = dev_get_drvdata(dev);
763 return card ? aaci_do_resume(card) : 0;
766 static SIMPLE_DEV_PM_OPS(aaci_dev_pm_ops, aaci_suspend, aaci_resume);
767 #define AACI_DEV_PM_OPS (&aaci_dev_pm_ops)
769 #define AACI_DEV_PM_OPS NULL
773 static const struct ac97_pcm ac97_defs[] = {
774 [0] = { /* Front PCM */
778 .slots = (1 << AC97_SLOT_PCM_LEFT) |
779 (1 << AC97_SLOT_PCM_RIGHT) |
780 (1 << AC97_SLOT_PCM_CENTER) |
781 (1 << AC97_SLOT_PCM_SLEFT) |
782 (1 << AC97_SLOT_PCM_SRIGHT) |
783 (1 << AC97_SLOT_LFE),
786 .slots = (1 << AC97_SLOT_PCM_LEFT) |
787 (1 << AC97_SLOT_PCM_RIGHT) |
788 (1 << AC97_SLOT_PCM_LEFT_0) |
789 (1 << AC97_SLOT_PCM_RIGHT_0),
798 .slots = (1 << AC97_SLOT_PCM_LEFT) |
799 (1 << AC97_SLOT_PCM_RIGHT),
808 .slots = (1 << AC97_SLOT_MIC),
814 static const struct snd_ac97_bus_ops aaci_bus_ops = {
815 .write = aaci_ac97_write,
816 .read = aaci_ac97_read,
819 static int aaci_probe_ac97(struct aaci *aaci)
821 struct snd_ac97_template ac97_template;
822 struct snd_ac97_bus *ac97_bus;
823 struct snd_ac97 *ac97;
827 * Assert AACIRESET for 2us
829 writel(0, aaci->base + AACI_RESET);
831 writel(RESET_NRST, aaci->base + AACI_RESET);
834 * Give the AC'97 codec more than enough time
835 * to wake up. (42us = ~2 frames at 48kHz.)
837 udelay(FRAME_PERIOD_US * 2);
839 ret = snd_ac97_bus(aaci->card, 0, &aaci_bus_ops, aaci, &ac97_bus);
843 ac97_bus->clock = 48000;
844 aaci->ac97_bus = ac97_bus;
846 memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
847 ac97_template.private_data = aaci;
848 ac97_template.num = 0;
849 ac97_template.scaps = AC97_SCAP_SKIP_MODEM;
851 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97);
857 * Disable AC97 PC Beep input on audio codecs.
859 if (ac97_is_audio(ac97))
860 snd_ac97_write_cache(ac97, AC97_PC_BEEP, 0x801e);
862 ret = snd_ac97_pcm_assign(ac97_bus, ARRAY_SIZE(ac97_defs), ac97_defs);
866 aaci->playback.pcm = &ac97_bus->pcms[0];
867 aaci->capture.pcm = &ac97_bus->pcms[1];
873 static void aaci_free_card(struct snd_card *card)
875 struct aaci *aaci = card->private_data;
880 static struct aaci *aaci_init_card(struct amba_device *dev)
883 struct snd_card *card;
886 err = snd_card_new(&dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
887 THIS_MODULE, sizeof(struct aaci), &card);
891 card->private_free = aaci_free_card;
893 strscpy(card->driver, DRIVER_NAME, sizeof(card->driver));
894 strscpy(card->shortname, "ARM AC'97 Interface", sizeof(card->shortname));
895 snprintf(card->longname, sizeof(card->longname),
896 "%s PL%03x rev%u at 0x%08llx, irq %d",
897 card->shortname, amba_part(dev), amba_rev(dev),
898 (unsigned long long)dev->res.start, dev->irq[0]);
900 aaci = card->private_data;
901 mutex_init(&aaci->ac97_sem);
902 mutex_init(&aaci->irq_lock);
906 /* Set MAINCR to allow slot 1 and 2 data IO */
907 aaci->maincr = MAINCR_IE | MAINCR_SL1RXEN | MAINCR_SL1TXEN |
908 MAINCR_SL2RXEN | MAINCR_SL2TXEN;
913 static int aaci_init_pcm(struct aaci *aaci)
918 ret = snd_pcm_new(aaci->card, "AACI AC'97", 0, 1, 1, &pcm);
921 pcm->private_data = aaci;
924 strscpy(pcm->name, DRIVER_NAME, sizeof(pcm->name));
926 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &aaci_playback_ops);
927 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &aaci_capture_ops);
928 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
936 static unsigned int aaci_size_fifo(struct aaci *aaci)
938 struct aaci_runtime *aacirun = &aaci->playback;
942 * Enable the channel, but don't assign it to any slots, so
943 * it won't empty onto the AC'97 link.
945 writel(CR_FEN | CR_SZ16 | CR_EN, aacirun->base + AACI_TXCR);
947 for (i = 0; !(readl(aacirun->base + AACI_SR) & SR_TXFF) && i < 4096; i++)
948 writel(0, aacirun->fifo);
950 writel(0, aacirun->base + AACI_TXCR);
953 * Re-initialise the AACI after the FIFO depth test, to
954 * ensure that the FIFOs are empty. Unfortunately, merely
955 * disabling the channel doesn't clear the FIFO.
957 writel(aaci->maincr & ~MAINCR_IE, aaci->base + AACI_MAINCR);
958 readl(aaci->base + AACI_MAINCR);
960 writel(aaci->maincr, aaci->base + AACI_MAINCR);
963 * If we hit 4096 entries, we failed. Go back to the specified
972 static int aaci_probe(struct amba_device *dev,
973 const struct amba_id *id)
978 ret = amba_request_regions(dev, NULL);
982 aaci = aaci_init_card(dev);
988 aaci->base = ioremap(dev->res.start, resource_size(&dev->res));
995 * Playback uses AACI channel 0
997 spin_lock_init(&aaci->playback.lock);
998 aaci->playback.base = aaci->base + AACI_CSCH1;
999 aaci->playback.fifo = aaci->base + AACI_DR1;
1002 * Capture uses AACI channel 0
1004 spin_lock_init(&aaci->capture.lock);
1005 aaci->capture.base = aaci->base + AACI_CSCH1;
1006 aaci->capture.fifo = aaci->base + AACI_DR1;
1008 for (i = 0; i < 4; i++) {
1009 void __iomem *base = aaci->base + i * 0x14;
1011 writel(0, base + AACI_IE);
1012 writel(0, base + AACI_TXCR);
1013 writel(0, base + AACI_RXCR);
1016 writel(0x1fff, aaci->base + AACI_INTCLR);
1017 writel(aaci->maincr, aaci->base + AACI_MAINCR);
1019 * Fix: ac97 read back fail errors by reading
1020 * from any arbitrary aaci register.
1022 readl(aaci->base + AACI_CSCH1);
1023 ret = aaci_probe_ac97(aaci);
1028 * Size the FIFOs (must be multiple of 16).
1029 * This is the number of entries in the FIFO.
1031 aaci->fifo_depth = aaci_size_fifo(aaci);
1032 if (aaci->fifo_depth & 15) {
1033 printk(KERN_WARNING "AACI: FIFO depth %d not supported\n",
1039 ret = aaci_init_pcm(aaci);
1043 ret = snd_card_register(aaci->card);
1045 dev_info(&dev->dev, "%s\n", aaci->card->longname);
1046 dev_info(&dev->dev, "FIFO %u entries\n", aaci->fifo_depth);
1047 amba_set_drvdata(dev, aaci->card);
1053 snd_card_free(aaci->card);
1054 amba_release_regions(dev);
1058 static void aaci_remove(struct amba_device *dev)
1060 struct snd_card *card = amba_get_drvdata(dev);
1063 struct aaci *aaci = card->private_data;
1064 writel(0, aaci->base + AACI_MAINCR);
1066 snd_card_free(card);
1067 amba_release_regions(dev);
1071 static struct amba_id aaci_ids[] = {
1079 MODULE_DEVICE_TABLE(amba, aaci_ids);
1081 static struct amba_driver aaci_driver = {
1083 .name = DRIVER_NAME,
1084 .pm = AACI_DEV_PM_OPS,
1086 .probe = aaci_probe,
1087 .remove = aaci_remove,
1088 .id_table = aaci_ids,
1091 module_amba_driver(aaci_driver);
1093 MODULE_LICENSE("GPL");
1094 MODULE_DESCRIPTION("ARM PrimeCell PL041 Advanced Audio CODEC Interface driver");