2 * linux/sound/arm/aaci.c - ARM PrimeCell AACI PL041 driver
4 * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * Documentation: ARM DDI 0173B
12 #include <linux/module.h>
13 #include <linux/delay.h>
14 #include <linux/init.h>
15 #include <linux/ioport.h>
16 #include <linux/device.h>
17 #include <linux/spinlock.h>
18 #include <linux/interrupt.h>
19 #include <linux/err.h>
20 #include <linux/amba/bus.h>
23 #include <sound/core.h>
24 #include <sound/initval.h>
25 #include <sound/ac97_codec.h>
26 #include <sound/pcm.h>
27 #include <sound/pcm_params.h>
31 #define DRIVER_NAME "aaci-pl041"
33 #define FRAME_PERIOD_US 21
36 * PM support is not complete. Turn it off.
40 static void aaci_ac97_select_codec(struct aaci *aaci, struct snd_ac97 *ac97)
42 u32 v, maincr = aaci->maincr | MAINCR_SCRA(ac97->num);
45 * Ensure that the slot 1/2 RX registers are empty.
47 v = readl(aaci->base + AACI_SLFR);
49 readl(aaci->base + AACI_SL2RX);
51 readl(aaci->base + AACI_SL1RX);
53 if (maincr != readl(aaci->base + AACI_MAINCR)) {
54 writel(maincr, aaci->base + AACI_MAINCR);
55 readl(aaci->base + AACI_MAINCR);
62 * The recommended use of programming the external codec through slot 1
63 * and slot 2 data is to use the channels during setup routines and the
64 * slot register at any other time. The data written into slot 1, slot 2
65 * and slot 12 registers is transmitted only when their corresponding
66 * SI1TxEn, SI2TxEn and SI12TxEn bits are set in the AACI_MAINCR
69 static void aaci_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
72 struct aaci *aaci = ac97->private_data;
79 mutex_lock(&aaci->ac97_sem);
81 aaci_ac97_select_codec(aaci, ac97);
84 * P54: You must ensure that AACI_SL2TX is always written
85 * to, if required, before data is written to AACI_SL1TX.
87 writel(val << 4, aaci->base + AACI_SL2TX);
88 writel(reg << 12, aaci->base + AACI_SL1TX);
90 /* Initially, wait one frame period */
91 udelay(FRAME_PERIOD_US);
93 /* And then wait an additional eight frame periods for it to be sent */
94 timeout = FRAME_PERIOD_US * 8;
97 v = readl(aaci->base + AACI_SLFR);
98 } while ((v & (SLFR_1TXB|SLFR_2TXB)) && --timeout);
100 if (v & (SLFR_1TXB|SLFR_2TXB))
101 dev_err(&aaci->dev->dev,
102 "timeout waiting for write to complete\n");
104 mutex_unlock(&aaci->ac97_sem);
108 * Read an AC'97 register.
110 static unsigned short aaci_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
112 struct aaci *aaci = ac97->private_data;
113 int timeout, retries = 10;
119 mutex_lock(&aaci->ac97_sem);
121 aaci_ac97_select_codec(aaci, ac97);
124 * Write the register address to slot 1.
126 writel((reg << 12) | (1 << 19), aaci->base + AACI_SL1TX);
128 /* Initially, wait one frame period */
129 udelay(FRAME_PERIOD_US);
131 /* And then wait an additional eight frame periods for it to be sent */
132 timeout = FRAME_PERIOD_US * 8;
135 v = readl(aaci->base + AACI_SLFR);
136 } while ((v & SLFR_1TXB) && --timeout);
139 dev_err(&aaci->dev->dev, "timeout on slot 1 TX busy\n");
144 /* Now wait for the response frame */
145 udelay(FRAME_PERIOD_US);
147 /* And then wait an additional eight frame periods for data */
148 timeout = FRAME_PERIOD_US * 8;
152 v = readl(aaci->base + AACI_SLFR) & (SLFR_1RXV|SLFR_2RXV);
153 } while ((v != (SLFR_1RXV|SLFR_2RXV)) && --timeout);
155 if (v != (SLFR_1RXV|SLFR_2RXV)) {
156 dev_err(&aaci->dev->dev, "timeout on RX valid\n");
162 v = readl(aaci->base + AACI_SL1RX) >> 12;
164 v = readl(aaci->base + AACI_SL2RX) >> 4;
166 } else if (--retries) {
167 dev_warn(&aaci->dev->dev,
168 "ac97 read back fail. retry\n");
171 dev_warn(&aaci->dev->dev,
172 "wrong ac97 register read back (%x != %x)\n",
178 mutex_unlock(&aaci->ac97_sem);
183 aaci_chan_wait_ready(struct aaci_runtime *aacirun, unsigned long mask)
190 val = readl(aacirun->base + AACI_SR);
191 } while (val & mask && timeout--);
199 static void aaci_fifo_irq(struct aaci *aaci, int channel, u32 mask)
201 if (mask & ISR_ORINTR) {
202 dev_warn(&aaci->dev->dev, "RX overrun on chan %d\n", channel);
203 writel(ICLR_RXOEC1 << channel, aaci->base + AACI_INTCLR);
206 if (mask & ISR_RXTOINTR) {
207 dev_warn(&aaci->dev->dev, "RX timeout on chan %d\n", channel);
208 writel(ICLR_RXTOFEC1 << channel, aaci->base + AACI_INTCLR);
211 if (mask & ISR_RXINTR) {
212 struct aaci_runtime *aacirun = &aaci->capture;
213 bool period_elapsed = false;
216 if (!aacirun->substream || !aacirun->start) {
217 dev_warn(&aaci->dev->dev, "RX interrupt???\n");
218 writel(0, aacirun->base + AACI_IE);
222 spin_lock(&aacirun->lock);
226 unsigned int len = aacirun->fifo_bytes;
229 if (aacirun->bytes <= 0) {
230 aacirun->bytes += aacirun->period;
231 period_elapsed = true;
233 if (!(aacirun->cr & CR_EN))
236 val = readl(aacirun->base + AACI_SR);
237 if (!(val & SR_RXHF))
239 if (!(val & SR_RXFF))
242 aacirun->bytes -= len;
244 /* reading 16 bytes at a time */
245 for( ; len > 0; len -= 16) {
247 "ldmia %1, {r0, r1, r2, r3}\n\t"
248 "stmia %0!, {r0, r1, r2, r3}"
250 : "r" (aacirun->fifo)
251 : "r0", "r1", "r2", "r3", "cc");
253 if (ptr >= aacirun->end)
254 ptr = aacirun->start;
260 spin_unlock(&aacirun->lock);
263 snd_pcm_period_elapsed(aacirun->substream);
266 if (mask & ISR_URINTR) {
267 dev_dbg(&aaci->dev->dev, "TX underrun on chan %d\n", channel);
268 writel(ICLR_TXUEC1 << channel, aaci->base + AACI_INTCLR);
271 if (mask & ISR_TXINTR) {
272 struct aaci_runtime *aacirun = &aaci->playback;
273 bool period_elapsed = false;
276 if (!aacirun->substream || !aacirun->start) {
277 dev_warn(&aaci->dev->dev, "TX interrupt???\n");
278 writel(0, aacirun->base + AACI_IE);
282 spin_lock(&aacirun->lock);
286 unsigned int len = aacirun->fifo_bytes;
289 if (aacirun->bytes <= 0) {
290 aacirun->bytes += aacirun->period;
291 period_elapsed = true;
293 if (!(aacirun->cr & CR_EN))
296 val = readl(aacirun->base + AACI_SR);
297 if (!(val & SR_TXHE))
299 if (!(val & SR_TXFE))
302 aacirun->bytes -= len;
304 /* writing 16 bytes at a time */
305 for ( ; len > 0; len -= 16) {
307 "ldmia %0!, {r0, r1, r2, r3}\n\t"
308 "stmia %1, {r0, r1, r2, r3}"
310 : "r" (aacirun->fifo)
311 : "r0", "r1", "r2", "r3", "cc");
313 if (ptr >= aacirun->end)
314 ptr = aacirun->start;
320 spin_unlock(&aacirun->lock);
323 snd_pcm_period_elapsed(aacirun->substream);
327 static irqreturn_t aaci_irq(int irq, void *devid)
329 struct aaci *aaci = devid;
333 mask = readl(aaci->base + AACI_ALLINTS);
336 for (i = 0; i < 4; i++, m >>= 7) {
338 aaci_fifo_irq(aaci, i, m);
343 return mask ? IRQ_HANDLED : IRQ_NONE;
351 static struct snd_pcm_hardware aaci_hw_info = {
352 .info = SNDRV_PCM_INFO_MMAP |
353 SNDRV_PCM_INFO_MMAP_VALID |
354 SNDRV_PCM_INFO_INTERLEAVED |
355 SNDRV_PCM_INFO_BLOCK_TRANSFER |
356 SNDRV_PCM_INFO_RESUME,
359 * ALSA doesn't support 18-bit or 20-bit packed into 32-bit
360 * words. It also doesn't support 12-bit at all.
362 .formats = SNDRV_PCM_FMTBIT_S16_LE,
364 /* rates are setup from the AC'97 codec */
367 .buffer_bytes_max = 64 * 1024,
368 .period_bytes_min = 256,
369 .period_bytes_max = PAGE_SIZE,
371 .periods_max = PAGE_SIZE / 16,
375 * We can support two and four channel audio. Unfortunately
376 * six channel audio requires a non-standard channel ordering:
378 * 4 -> FL(3), FR(4), SL(7), SR(8)
379 * 6 -> FL(3), FR(4), SL(7), SR(8), C(6), LFE(9) (required)
380 * FL(3), FR(4), C(6), SL(7), SR(8), LFE(9) (actual)
381 * This requires an ALSA configuration file to correct.
383 static int aaci_rule_channels(struct snd_pcm_hw_params *p,
384 struct snd_pcm_hw_rule *rule)
386 static unsigned int channel_list[] = { 2, 4, 6 };
387 struct aaci *aaci = rule->private;
388 unsigned int mask = 1 << 0, slots;
390 /* pcms[0] is the our 5.1 PCM instance. */
391 slots = aaci->ac97_bus->pcms[0].r[0].slots;
392 if (slots & (1 << AC97_SLOT_PCM_SLEFT)) {
394 if (slots & (1 << AC97_SLOT_LFE))
398 return snd_interval_list(hw_param_interval(p, rule->var),
399 ARRAY_SIZE(channel_list), channel_list, mask);
402 static int aaci_pcm_open(struct snd_pcm_substream *substream)
404 struct snd_pcm_runtime *runtime = substream->runtime;
405 struct aaci *aaci = substream->private_data;
406 struct aaci_runtime *aacirun;
409 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
410 aacirun = &aaci->playback;
412 aacirun = &aaci->capture;
415 aacirun->substream = substream;
416 runtime->private_data = aacirun;
417 runtime->hw = aaci_hw_info;
418 runtime->hw.rates = aacirun->pcm->rates;
419 snd_pcm_limit_hw_rates(runtime);
421 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
422 runtime->hw.channels_max = 6;
424 /* Add rule describing channel dependency. */
425 ret = snd_pcm_hw_rule_add(substream->runtime, 0,
426 SNDRV_PCM_HW_PARAM_CHANNELS,
427 aaci_rule_channels, aaci,
428 SNDRV_PCM_HW_PARAM_CHANNELS, -1);
432 if (aacirun->pcm->r[1].slots)
433 snd_ac97_pcm_double_rate_rules(runtime);
437 * ALSA wants the byte-size of the FIFOs. As we only support
438 * 16-bit samples, this is twice the FIFO depth irrespective
439 * of whether it's in compact mode or not.
441 runtime->hw.fifo_size = aaci->fifo_depth * 2;
443 mutex_lock(&aaci->irq_lock);
444 if (!aaci->users++) {
445 ret = request_irq(aaci->dev->irq[0], aaci_irq,
446 IRQF_SHARED, DRIVER_NAME, aaci);
450 mutex_unlock(&aaci->irq_lock);
459 static int aaci_pcm_close(struct snd_pcm_substream *substream)
461 struct aaci *aaci = substream->private_data;
462 struct aaci_runtime *aacirun = substream->runtime->private_data;
464 WARN_ON(aacirun->cr & CR_EN);
466 aacirun->substream = NULL;
468 mutex_lock(&aaci->irq_lock);
470 free_irq(aaci->dev->irq[0], aaci);
471 mutex_unlock(&aaci->irq_lock);
476 static int aaci_pcm_hw_free(struct snd_pcm_substream *substream)
478 struct aaci_runtime *aacirun = substream->runtime->private_data;
481 * This must not be called with the device enabled.
483 WARN_ON(aacirun->cr & CR_EN);
485 if (aacirun->pcm_open)
486 snd_ac97_pcm_close(aacirun->pcm);
487 aacirun->pcm_open = 0;
490 * Clear out the DMA and any allocated buffers.
492 snd_pcm_lib_free_pages(substream);
497 /* Channel to slot mask */
498 static const u32 channels_to_slotmask[] = {
499 [2] = CR_SL3 | CR_SL4,
500 [4] = CR_SL3 | CR_SL4 | CR_SL7 | CR_SL8,
501 [6] = CR_SL3 | CR_SL4 | CR_SL7 | CR_SL8 | CR_SL6 | CR_SL9,
504 static int aaci_pcm_hw_params(struct snd_pcm_substream *substream,
505 struct snd_pcm_hw_params *params)
507 struct aaci_runtime *aacirun = substream->runtime->private_data;
508 unsigned int channels = params_channels(params);
509 unsigned int rate = params_rate(params);
510 int dbl = rate > 48000;
513 aaci_pcm_hw_free(substream);
514 if (aacirun->pcm_open) {
515 snd_ac97_pcm_close(aacirun->pcm);
516 aacirun->pcm_open = 0;
519 /* channels is already limited to 2, 4, or 6 by aaci_rule_channels */
520 if (dbl && channels != 2)
523 err = snd_pcm_lib_malloc_pages(substream,
524 params_buffer_bytes(params));
526 struct aaci *aaci = substream->private_data;
528 err = snd_ac97_pcm_open(aacirun->pcm, rate, channels,
529 aacirun->pcm->r[dbl].slots);
531 aacirun->pcm_open = err == 0;
532 aacirun->cr = CR_FEN | CR_COMPACT | CR_SZ16;
533 aacirun->cr |= channels_to_slotmask[channels + dbl * 2];
536 * fifo_bytes is the number of bytes we transfer to/from
537 * the FIFO, including padding. So that's x4. As we're
538 * in compact mode, the FIFO is half the size.
540 aacirun->fifo_bytes = aaci->fifo_depth * 4 / 2;
546 static int aaci_pcm_prepare(struct snd_pcm_substream *substream)
548 struct snd_pcm_runtime *runtime = substream->runtime;
549 struct aaci_runtime *aacirun = runtime->private_data;
551 aacirun->period = snd_pcm_lib_period_bytes(substream);
552 aacirun->start = runtime->dma_area;
553 aacirun->end = aacirun->start + snd_pcm_lib_buffer_bytes(substream);
554 aacirun->ptr = aacirun->start;
555 aacirun->bytes = aacirun->period;
560 static snd_pcm_uframes_t aaci_pcm_pointer(struct snd_pcm_substream *substream)
562 struct snd_pcm_runtime *runtime = substream->runtime;
563 struct aaci_runtime *aacirun = runtime->private_data;
564 ssize_t bytes = aacirun->ptr - aacirun->start;
566 return bytes_to_frames(runtime, bytes);
571 * Playback specific ALSA stuff
573 static void aaci_pcm_playback_stop(struct aaci_runtime *aacirun)
577 ie = readl(aacirun->base + AACI_IE);
578 ie &= ~(IE_URIE|IE_TXIE);
579 writel(ie, aacirun->base + AACI_IE);
580 aacirun->cr &= ~CR_EN;
581 aaci_chan_wait_ready(aacirun, SR_TXB);
582 writel(aacirun->cr, aacirun->base + AACI_TXCR);
585 static void aaci_pcm_playback_start(struct aaci_runtime *aacirun)
589 aaci_chan_wait_ready(aacirun, SR_TXB);
590 aacirun->cr |= CR_EN;
592 ie = readl(aacirun->base + AACI_IE);
593 ie |= IE_URIE | IE_TXIE;
594 writel(ie, aacirun->base + AACI_IE);
595 writel(aacirun->cr, aacirun->base + AACI_TXCR);
598 static int aaci_pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
600 struct aaci_runtime *aacirun = substream->runtime->private_data;
604 spin_lock_irqsave(&aacirun->lock, flags);
607 case SNDRV_PCM_TRIGGER_START:
608 aaci_pcm_playback_start(aacirun);
611 case SNDRV_PCM_TRIGGER_RESUME:
612 aaci_pcm_playback_start(aacirun);
615 case SNDRV_PCM_TRIGGER_STOP:
616 aaci_pcm_playback_stop(aacirun);
619 case SNDRV_PCM_TRIGGER_SUSPEND:
620 aaci_pcm_playback_stop(aacirun);
623 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
626 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
633 spin_unlock_irqrestore(&aacirun->lock, flags);
638 static struct snd_pcm_ops aaci_playback_ops = {
639 .open = aaci_pcm_open,
640 .close = aaci_pcm_close,
641 .ioctl = snd_pcm_lib_ioctl,
642 .hw_params = aaci_pcm_hw_params,
643 .hw_free = aaci_pcm_hw_free,
644 .prepare = aaci_pcm_prepare,
645 .trigger = aaci_pcm_playback_trigger,
646 .pointer = aaci_pcm_pointer,
649 static void aaci_pcm_capture_stop(struct aaci_runtime *aacirun)
653 aaci_chan_wait_ready(aacirun, SR_RXB);
655 ie = readl(aacirun->base + AACI_IE);
656 ie &= ~(IE_ORIE | IE_RXIE);
657 writel(ie, aacirun->base+AACI_IE);
659 aacirun->cr &= ~CR_EN;
661 writel(aacirun->cr, aacirun->base + AACI_RXCR);
664 static void aaci_pcm_capture_start(struct aaci_runtime *aacirun)
668 aaci_chan_wait_ready(aacirun, SR_RXB);
671 /* RX Timeout value: bits 28:17 in RXCR */
672 aacirun->cr |= 0xf << 17;
675 aacirun->cr |= CR_EN;
676 writel(aacirun->cr, aacirun->base + AACI_RXCR);
678 ie = readl(aacirun->base + AACI_IE);
679 ie |= IE_ORIE |IE_RXIE; // overrun and rx interrupt -- half full
680 writel(ie, aacirun->base + AACI_IE);
683 static int aaci_pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
685 struct aaci_runtime *aacirun = substream->runtime->private_data;
689 spin_lock_irqsave(&aacirun->lock, flags);
692 case SNDRV_PCM_TRIGGER_START:
693 aaci_pcm_capture_start(aacirun);
696 case SNDRV_PCM_TRIGGER_RESUME:
697 aaci_pcm_capture_start(aacirun);
700 case SNDRV_PCM_TRIGGER_STOP:
701 aaci_pcm_capture_stop(aacirun);
704 case SNDRV_PCM_TRIGGER_SUSPEND:
705 aaci_pcm_capture_stop(aacirun);
708 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
711 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
718 spin_unlock_irqrestore(&aacirun->lock, flags);
723 static int aaci_pcm_capture_prepare(struct snd_pcm_substream *substream)
725 struct snd_pcm_runtime *runtime = substream->runtime;
726 struct aaci *aaci = substream->private_data;
728 aaci_pcm_prepare(substream);
730 /* allow changing of sample rate */
731 aaci_ac97_write(aaci->ac97, AC97_EXTENDED_STATUS, 0x0001); /* VRA */
732 aaci_ac97_write(aaci->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
733 aaci_ac97_write(aaci->ac97, AC97_PCM_MIC_ADC_RATE, runtime->rate);
735 /* Record select: Mic: 0, Aux: 3, Line: 4 */
736 aaci_ac97_write(aaci->ac97, AC97_REC_SEL, 0x0404);
741 static struct snd_pcm_ops aaci_capture_ops = {
742 .open = aaci_pcm_open,
743 .close = aaci_pcm_close,
744 .ioctl = snd_pcm_lib_ioctl,
745 .hw_params = aaci_pcm_hw_params,
746 .hw_free = aaci_pcm_hw_free,
747 .prepare = aaci_pcm_capture_prepare,
748 .trigger = aaci_pcm_capture_trigger,
749 .pointer = aaci_pcm_pointer,
756 static int aaci_do_suspend(struct snd_card *card, unsigned int state)
758 struct aaci *aaci = card->private_data;
759 snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
760 snd_pcm_suspend_all(aaci->pcm);
764 static int aaci_do_resume(struct snd_card *card, unsigned int state)
766 snd_power_change_state(card, SNDRV_CTL_POWER_D0);
770 static int aaci_suspend(struct amba_device *dev, pm_message_t state)
772 struct snd_card *card = amba_get_drvdata(dev);
773 return card ? aaci_do_suspend(card) : 0;
776 static int aaci_resume(struct amba_device *dev)
778 struct snd_card *card = amba_get_drvdata(dev);
779 return card ? aaci_do_resume(card) : 0;
782 #define aaci_do_suspend NULL
783 #define aaci_do_resume NULL
784 #define aaci_suspend NULL
785 #define aaci_resume NULL
789 static struct ac97_pcm ac97_defs[] = {
790 [0] = { /* Front PCM */
794 .slots = (1 << AC97_SLOT_PCM_LEFT) |
795 (1 << AC97_SLOT_PCM_RIGHT) |
796 (1 << AC97_SLOT_PCM_CENTER) |
797 (1 << AC97_SLOT_PCM_SLEFT) |
798 (1 << AC97_SLOT_PCM_SRIGHT) |
799 (1 << AC97_SLOT_LFE),
802 .slots = (1 << AC97_SLOT_PCM_LEFT) |
803 (1 << AC97_SLOT_PCM_RIGHT) |
804 (1 << AC97_SLOT_PCM_LEFT_0) |
805 (1 << AC97_SLOT_PCM_RIGHT_0),
814 .slots = (1 << AC97_SLOT_PCM_LEFT) |
815 (1 << AC97_SLOT_PCM_RIGHT),
824 .slots = (1 << AC97_SLOT_MIC),
830 static struct snd_ac97_bus_ops aaci_bus_ops = {
831 .write = aaci_ac97_write,
832 .read = aaci_ac97_read,
835 static int aaci_probe_ac97(struct aaci *aaci)
837 struct snd_ac97_template ac97_template;
838 struct snd_ac97_bus *ac97_bus;
839 struct snd_ac97 *ac97;
843 * Assert AACIRESET for 2us
845 writel(0, aaci->base + AACI_RESET);
847 writel(RESET_NRST, aaci->base + AACI_RESET);
850 * Give the AC'97 codec more than enough time
851 * to wake up. (42us = ~2 frames at 48kHz.)
853 udelay(FRAME_PERIOD_US * 2);
855 ret = snd_ac97_bus(aaci->card, 0, &aaci_bus_ops, aaci, &ac97_bus);
859 ac97_bus->clock = 48000;
860 aaci->ac97_bus = ac97_bus;
862 memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
863 ac97_template.private_data = aaci;
864 ac97_template.num = 0;
865 ac97_template.scaps = AC97_SCAP_SKIP_MODEM;
867 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97);
873 * Disable AC97 PC Beep input on audio codecs.
875 if (ac97_is_audio(ac97))
876 snd_ac97_write_cache(ac97, AC97_PC_BEEP, 0x801e);
878 ret = snd_ac97_pcm_assign(ac97_bus, ARRAY_SIZE(ac97_defs), ac97_defs);
882 aaci->playback.pcm = &ac97_bus->pcms[0];
883 aaci->capture.pcm = &ac97_bus->pcms[1];
889 static void aaci_free_card(struct snd_card *card)
891 struct aaci *aaci = card->private_data;
896 static struct aaci *aaci_init_card(struct amba_device *dev)
899 struct snd_card *card;
902 err = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
903 THIS_MODULE, sizeof(struct aaci), &card);
907 card->private_free = aaci_free_card;
909 strlcpy(card->driver, DRIVER_NAME, sizeof(card->driver));
910 strlcpy(card->shortname, "ARM AC'97 Interface", sizeof(card->shortname));
911 snprintf(card->longname, sizeof(card->longname),
912 "%s PL%03x rev%u at 0x%08llx, irq %d",
913 card->shortname, amba_part(dev), amba_rev(dev),
914 (unsigned long long)dev->res.start, dev->irq[0]);
916 aaci = card->private_data;
917 mutex_init(&aaci->ac97_sem);
918 mutex_init(&aaci->irq_lock);
922 /* Set MAINCR to allow slot 1 and 2 data IO */
923 aaci->maincr = MAINCR_IE | MAINCR_SL1RXEN | MAINCR_SL1TXEN |
924 MAINCR_SL2RXEN | MAINCR_SL2TXEN;
929 static int aaci_init_pcm(struct aaci *aaci)
934 ret = snd_pcm_new(aaci->card, "AACI AC'97", 0, 1, 1, &pcm);
937 pcm->private_data = aaci;
940 strlcpy(pcm->name, DRIVER_NAME, sizeof(pcm->name));
942 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &aaci_playback_ops);
943 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &aaci_capture_ops);
944 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
951 static unsigned int aaci_size_fifo(struct aaci *aaci)
953 struct aaci_runtime *aacirun = &aaci->playback;
957 * Enable the channel, but don't assign it to any slots, so
958 * it won't empty onto the AC'97 link.
960 writel(CR_FEN | CR_SZ16 | CR_EN, aacirun->base + AACI_TXCR);
962 for (i = 0; !(readl(aacirun->base + AACI_SR) & SR_TXFF) && i < 4096; i++)
963 writel(0, aacirun->fifo);
965 writel(0, aacirun->base + AACI_TXCR);
968 * Re-initialise the AACI after the FIFO depth test, to
969 * ensure that the FIFOs are empty. Unfortunately, merely
970 * disabling the channel doesn't clear the FIFO.
972 writel(aaci->maincr & ~MAINCR_IE, aaci->base + AACI_MAINCR);
973 readl(aaci->base + AACI_MAINCR);
975 writel(aaci->maincr, aaci->base + AACI_MAINCR);
978 * If we hit 4096 entries, we failed. Go back to the specified
987 static int aaci_probe(struct amba_device *dev,
988 const struct amba_id *id)
993 ret = amba_request_regions(dev, NULL);
997 aaci = aaci_init_card(dev);
1003 aaci->base = ioremap(dev->res.start, resource_size(&dev->res));
1010 * Playback uses AACI channel 0
1012 spin_lock_init(&aaci->playback.lock);
1013 aaci->playback.base = aaci->base + AACI_CSCH1;
1014 aaci->playback.fifo = aaci->base + AACI_DR1;
1017 * Capture uses AACI channel 0
1019 spin_lock_init(&aaci->capture.lock);
1020 aaci->capture.base = aaci->base + AACI_CSCH1;
1021 aaci->capture.fifo = aaci->base + AACI_DR1;
1023 for (i = 0; i < 4; i++) {
1024 void __iomem *base = aaci->base + i * 0x14;
1026 writel(0, base + AACI_IE);
1027 writel(0, base + AACI_TXCR);
1028 writel(0, base + AACI_RXCR);
1031 writel(0x1fff, aaci->base + AACI_INTCLR);
1032 writel(aaci->maincr, aaci->base + AACI_MAINCR);
1034 * Fix: ac97 read back fail errors by reading
1035 * from any arbitrary aaci register.
1037 readl(aaci->base + AACI_CSCH1);
1038 ret = aaci_probe_ac97(aaci);
1043 * Size the FIFOs (must be multiple of 16).
1044 * This is the number of entries in the FIFO.
1046 aaci->fifo_depth = aaci_size_fifo(aaci);
1047 if (aaci->fifo_depth & 15) {
1048 printk(KERN_WARNING "AACI: FIFO depth %d not supported\n",
1054 ret = aaci_init_pcm(aaci);
1058 snd_card_set_dev(aaci->card, &dev->dev);
1060 ret = snd_card_register(aaci->card);
1062 dev_info(&dev->dev, "%s\n", aaci->card->longname);
1063 dev_info(&dev->dev, "FIFO %u entries\n", aaci->fifo_depth);
1064 amba_set_drvdata(dev, aaci->card);
1070 snd_card_free(aaci->card);
1071 amba_release_regions(dev);
1075 static int aaci_remove(struct amba_device *dev)
1077 struct snd_card *card = amba_get_drvdata(dev);
1080 struct aaci *aaci = card->private_data;
1081 writel(0, aaci->base + AACI_MAINCR);
1083 snd_card_free(card);
1084 amba_release_regions(dev);
1090 static struct amba_id aaci_ids[] = {
1098 MODULE_DEVICE_TABLE(amba, aaci_ids);
1100 static struct amba_driver aaci_driver = {
1102 .name = DRIVER_NAME,
1104 .probe = aaci_probe,
1105 .remove = aaci_remove,
1106 .suspend = aaci_suspend,
1107 .resume = aaci_resume,
1108 .id_table = aaci_ids,
1111 module_amba_driver(aaci_driver);
1113 MODULE_LICENSE("GPL");
1114 MODULE_DESCRIPTION("ARM PrimeCell PL041 Advanced Audio CODEC Interface driver");