[ARM] 4139/1: AACI record support

Add PCM audio capture support for AACI audio on Versatile platform.
Signed-off-by: NKevin Hilman <khilman@mvista.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

sound/arm/aaci.c

@@ -166,6 +166,65 @@ static inline void aaci_chan_wait_ready(struct aaci_runtime *aacirun)
  */
 static void aaci_fifo_irq(struct aaci *aaci, int channel, u32 mask)
 {
+	if (mask & ISR_ORINTR) {
+		dev_warn(&aaci->dev->dev, "RX overrun on chan %d\n", channel);
+		writel(ICLR_RXOEC1 << channel, aaci->base + AACI_INTCLR);
+	}
+
+	if (mask & ISR_RXTOINTR) {
+		dev_warn(&aaci->dev->dev, "RX timeout on chan %d\n", channel);
+		writel(ICLR_RXTOFEC1 << channel, aaci->base + AACI_INTCLR);
+	}
+
+	if (mask & ISR_RXINTR) {
+		struct aaci_runtime *aacirun = &aaci->capture;
+		void *ptr;
+
+		if (!aacirun->substream || !aacirun->start) {
+			dev_warn(&aaci->dev->dev, "RX interrupt???");
+			writel(0, aacirun->base + AACI_IE);
+			return;
+		}
+		ptr = aacirun->ptr;
+
+		do {
+			unsigned int len = aacirun->fifosz;
+			u32 val;
+
+			if (aacirun->bytes <= 0) {
+				aacirun->bytes += aacirun->period;
+				aacirun->ptr = ptr;
+				spin_unlock(&aaci->lock);
+				snd_pcm_period_elapsed(aacirun->substream);
+				spin_lock(&aaci->lock);
+			}
+			if (!(aacirun->cr & CR_EN))
+				break;
+
+			val = readl(aacirun->base + AACI_SR);
+			if (!(val & SR_RXHF))
+				break;
+			if (!(val & SR_RXFF))
+				len >>= 1;
+
+			aacirun->bytes -= len;
+
+			/* reading 16 bytes at a time */
+			for( ; len > 0; len -= 16) {
+				asm(
+					"ldmia	%1, {r0, r1, r2, r3}\n\t"
+					"stmia	%0!, {r0, r1, r2, r3}"
+					: "+r" (ptr)
+					: "r" (aacirun->fifo)
+					: "r0", "r1", "r2", "r3", "cc");
+
+				if (ptr >= aacirun->end)
+					ptr = aacirun->start;
+			}
+		} while(1);
+		aacirun->ptr = ptr;
+	}
+
 	if (mask & ISR_URINTR) {
 		dev_dbg(&aaci->dev->dev, "TX underrun on chan %d\n", channel);
 		writel(ICLR_TXUEC1 << channel, aaci->base + AACI_INTCLR);
@@ -193,7 +252,7 @@ static void aaci_fifo_irq(struct aaci *aaci, int channel, u32 mask)
 				snd_pcm_period_elapsed(aacirun->substream);
 				spin_lock(&aaci->lock);
 			}
-			if (!(aacirun->cr & TXCR_TXEN))
+			if (!(aacirun->cr & CR_EN))
 				break;
 
 			val = readl(aacirun->base + AACI_SR);
@@ -331,8 +390,9 @@ static struct snd_pcm_hardware aaci_hw_info = {
 	.periods_max		= PAGE_SIZE / 16,
 };
 
-static int aaci_pcm_open(struct aaci *aaci, struct snd_pcm_substream *substream,
-			 struct aaci_runtime *aacirun)
+static int __aaci_pcm_open(struct aaci *aaci,
+			   struct snd_pcm_substream *substream,
+			   struct aaci_runtime *aacirun)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	int ret;
@@ -381,7 +441,7 @@ static int aaci_pcm_close(struct snd_pcm_substream *substream)
 	struct aaci *aaci = substream->private_data;
 	struct aaci_runtime *aacirun = substream->runtime->private_data;
 
-	WARN_ON(aacirun->cr & TXCR_TXEN);
+	WARN_ON(aacirun->cr & CR_EN);
 
 	aacirun->substream = NULL;
 	free_irq(aaci->dev->irq[0], aaci);
@@ -396,7 +456,7 @@ static int aaci_pcm_hw_free(struct snd_pcm_substream *substream)
 	/*
 	 * This must not be called with the device enabled.
 	 */
-	WARN_ON(aacirun->cr & TXCR_TXEN);
+	WARN_ON(aacirun->cr & CR_EN);
 
 	if (aacirun->pcm_open)
 		snd_ac97_pcm_close(aacirun->pcm);
@@ -423,9 +483,15 @@ static int aaci_pcm_hw_params(struct snd_pcm_substream *substream,
 	if (err < 0)
 		goto out;
 
-	err = snd_ac97_pcm_open(aacirun->pcm, params_rate(params),
-				params_channels(params),
-				aacirun->pcm->r[0].slots);
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		err = snd_ac97_pcm_open(aacirun->pcm, params_rate(params),
+					params_channels(params),
+					aacirun->pcm->r[0].slots);
+	else
+		err = snd_ac97_pcm_open(aacirun->pcm, params_rate(params),
+					params_channels(params),
+					aacirun->pcm->r[1].slots);
+
 	if (err)
 		goto out;
 
@@ -468,9 +534,9 @@ static int aaci_pcm_mmap(struct snd_pcm_substream *substream, struct vm_area_str
  * Playback specific ALSA stuff
  */
 static const u32 channels_to_txmask[] = {
-	[2] = TXCR_TX3 | TXCR_TX4,
-	[4] = TXCR_TX3 | TXCR_TX4 | TXCR_TX7 | TXCR_TX8,
-	[6] = TXCR_TX3 | TXCR_TX4 | TXCR_TX7 | TXCR_TX8 | TXCR_TX6 | TXCR_TX9,
+	[2] = CR_SL3 | CR_SL4,
+	[4] = CR_SL3 | CR_SL4 | CR_SL7 | CR_SL8,
+	[6] = CR_SL3 | CR_SL4 | CR_SL7 | CR_SL8 | CR_SL6 | CR_SL9,
 };
 
 /*
@@ -505,7 +571,7 @@ aaci_rule_channels(struct snd_pcm_hw_params *p, struct snd_pcm_hw_rule *rule)
 				 chan_mask);
 }
 
-static int aaci_pcm_playback_open(struct snd_pcm_substream *substream)
+static int aaci_pcm_open(struct snd_pcm_substream *substream)
 {
 	struct aaci *aaci = substream->private_data;
 	int ret;
@@ -520,7 +586,12 @@ static int aaci_pcm_playback_open(struct snd_pcm_substream *substream)
 	if (ret)
 		return ret;
 
-	return aaci_pcm_open(aaci, substream, &aaci->playback);
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		ret = __aaci_pcm_open(aaci, substream, &aaci->playback);
+	} else {
+		ret = __aaci_pcm_open(aaci, substream, &aaci->capture);
+	}
+	return ret;
 }
 
 static int aaci_pcm_playback_hw_params(struct snd_pcm_substream *substream,
@@ -541,11 +612,11 @@ static int aaci_pcm_playback_hw_params(struct snd_pcm_substream *substream,
 	 * FIXME: double rate slots?
 	 */
 	if (ret >= 0) {
-		aacirun->cr = TXCR_FEN | TXCR_COMPACT | TXCR_TSZ16;
+		aacirun->cr = CR_FEN | CR_COMPACT | CR_SZ16;
 		aacirun->cr |= channels_to_txmask[channels];
 
 		aacirun->fifosz	= aaci->fifosize * 4;
-		if (aacirun->cr & TXCR_COMPACT)
+		if (aacirun->cr & CR_COMPACT)
 			aacirun->fifosz >>= 1;
 	}
 	return ret;
@@ -558,7 +629,7 @@ static void aaci_pcm_playback_stop(struct aaci_runtime *aacirun)
 	ie = readl(aacirun->base + AACI_IE);
 	ie &= ~(IE_URIE|IE_TXIE);
 	writel(ie, aacirun->base + AACI_IE);
-	aacirun->cr &= ~TXCR_TXEN;
+	aacirun->cr &= ~CR_EN;
 	aaci_chan_wait_ready(aacirun);
 	writel(aacirun->cr, aacirun->base + AACI_TXCR);
 }
@@ -568,7 +639,7 @@ static void aaci_pcm_playback_start(struct aaci_runtime *aacirun)
 	u32 ie;
 
 	aaci_chan_wait_ready(aacirun);
-	aacirun->cr |= TXCR_TXEN;
+	aacirun->cr |= CR_EN;
 
 	ie = readl(aacirun->base + AACI_IE);
 	ie |= IE_URIE | IE_TXIE;
@@ -616,7 +687,7 @@ static int aaci_pcm_playback_trigger(struct snd_pcm_substream *substream, int cm
 }
 
 static struct snd_pcm_ops aaci_playback_ops = {
-	.open		= aaci_pcm_playback_open,
+	.open		= aaci_pcm_open,
 	.close		= aaci_pcm_close,
 	.ioctl		= snd_pcm_lib_ioctl,
 	.hw_params	= aaci_pcm_playback_hw_params,
@@ -627,7 +698,133 @@ static struct snd_pcm_ops aaci_playback_ops = {
 	.mmap		= aaci_pcm_mmap,
 };
 
+static int aaci_pcm_capture_hw_params(snd_pcm_substream_t *substream,
+				      snd_pcm_hw_params_t *params)
+{
+	struct aaci *aaci = substream->private_data;
+	struct aaci_runtime *aacirun = substream->runtime->private_data;
+	int ret;
+
+	ret = aaci_pcm_hw_params(substream, aacirun, params);
+
+	if (ret >= 0) {
+		aacirun->cr = CR_FEN | CR_COMPACT | CR_SZ16;
+
+		/* Line in record: slot 3 and 4 */
+		aacirun->cr |= CR_SL3 | CR_SL4;
+
+		aacirun->fifosz = aaci->fifosize * 4;
+
+		if (aacirun->cr & CR_COMPACT)
+			aacirun->fifosz >>= 1;
+	}
+	return ret;
+}
+
+static void aaci_pcm_capture_stop(struct aaci_runtime *aacirun)
+{
+	u32 ie;
+
+	aaci_chan_wait_ready(aacirun);
+
+	ie = readl(aacirun->base + AACI_IE);
+	ie &= ~(IE_ORIE | IE_RXIE);
+	writel(ie, aacirun->base+AACI_IE);
+
+	aacirun->cr &= ~CR_EN;
 
+	writel(aacirun->cr, aacirun->base + AACI_RXCR);
+}
+
+static void aaci_pcm_capture_start(struct aaci_runtime *aacirun)
+{
+	u32 ie;
+
+	aaci_chan_wait_ready(aacirun);
+
+#ifdef DEBUG
+	/* RX Timeout value: bits 28:17 in RXCR */
+	aacirun->cr |= 0xf << 17;
+#endif
+
+	aacirun->cr |= CR_EN;
+	writel(aacirun->cr, aacirun->base + AACI_RXCR);
+
+	ie = readl(aacirun->base + AACI_IE);
+	ie |= IE_ORIE |IE_RXIE; // overrun and rx interrupt -- half full
+	writel(ie, aacirun->base + AACI_IE);
+}
+
+static int aaci_pcm_capture_trigger(snd_pcm_substream_t *substream, int cmd){
+
+	struct aaci *aaci = substream->private_data;
+	struct aaci_runtime *aacirun = substream->runtime->private_data;
+	unsigned long flags;
+	int ret = 0;
+
+	spin_lock_irqsave(&aaci->lock, flags);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		aaci_pcm_capture_start(aacirun);
+		break;
+
+	case SNDRV_PCM_TRIGGER_RESUME:
+		aaci_pcm_capture_start(aacirun);
+		break;
+
+	case SNDRV_PCM_TRIGGER_STOP:
+		aaci_pcm_capture_stop(aacirun);
+		break;
+
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		aaci_pcm_capture_stop(aacirun);
+		break;
+
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		break;
+
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		break;
+
+	default:
+		ret = -EINVAL;
+	}
+
+	spin_unlock_irqrestore(&aaci->lock, flags);
+
+	return ret;
+}
+
+static int aaci_pcm_capture_prepare(snd_pcm_substream_t *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct aaci *aaci = substream->private_data;
+
+	aaci_pcm_prepare(substream);
+
+	/* allow changing of sample rate */
+	aaci_ac97_write(aaci->ac97, AC97_EXTENDED_STATUS, 0x0001); /* VRA */
+	aaci_ac97_write(aaci->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
+	aaci_ac97_write(aaci->ac97, AC97_PCM_MIC_ADC_RATE, runtime->rate);
+
+	/* Record select: Mic: 0, Aux: 3, Line: 4 */
+	aaci_ac97_write(aaci->ac97, AC97_REC_SEL, 0x0404);
+
+	return 0;
+}
+
+static snd_pcm_ops_t aaci_capture_ops = {
+	.open		= aaci_pcm_open,
+	.close		= aaci_pcm_close,
+	.ioctl		= snd_pcm_lib_ioctl,
+	.hw_params	= aaci_pcm_capture_hw_params,
+	.hw_free	= aaci_pcm_hw_free,
+	.prepare	= aaci_pcm_capture_prepare,
+	.trigger	= aaci_pcm_capture_trigger,
+	.pointer	= aaci_pcm_pointer,
+	.mmap		= aaci_pcm_mmap,
+};
 
 /*
  * Power Management.
@@ -667,7 +864,7 @@ static int aaci_resume(struct amba_device *dev)
 
 
 static struct ac97_pcm ac97_defs[] __devinitdata = {
-	[0] = {		/* Front PCM */
+	[0] = {	/* Front PCM */
 		.exclusive = 1,
 		.r = {
 			[0] = {
@@ -741,6 +938,7 @@ static int __devinit aaci_probe_ac97(struct aaci *aaci)
 	ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97);
 	if (ret)
 		goto out;
+	aaci->ac97 = ac97;
 
 	/*
 	 * Disable AC97 PC Beep input on audio codecs.
@@ -753,6 +951,7 @@ static int __devinit aaci_probe_ac97(struct aaci *aaci)
 		goto out;
 
 	aaci->playback.pcm = &ac97_bus->pcms[0];
+	aaci->capture.pcm  = &ac97_bus->pcms[1];
 
  out:
 	return ret;
@@ -802,7 +1001,7 @@ static int __devinit aaci_init_pcm(struct aaci *aaci)
 	struct snd_pcm *pcm;
 	int ret;
 
-	ret = snd_pcm_new(aaci->card, "AACI AC'97", 0, 1, 0, &pcm);
+	ret = snd_pcm_new(aaci->card, "AACI AC'97", 0, 1, 1, &pcm);
 	if (ret == 0) {
 		aaci->pcm = pcm;
 		pcm->private_data = aaci;
@@ -811,6 +1010,7 @@ static int __devinit aaci_init_pcm(struct aaci *aaci)
 		strlcpy(pcm->name, DRIVER_NAME, sizeof(pcm->name));
 
 		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &aaci_playback_ops);
+		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &aaci_capture_ops);
 	}
 
 	return ret;
@@ -818,15 +1018,15 @@ static int __devinit aaci_init_pcm(struct aaci *aaci)
 
 static unsigned int __devinit aaci_size_fifo(struct aaci *aaci)
 {
-	void __iomem *base = aaci->base + AACI_CSCH1;
+	struct aaci_runtime *aacirun = &aaci->playback;
 	int i;
 
-	writel(TXCR_FEN | TXCR_TSZ16 | TXCR_TXEN, base + AACI_TXCR);
+	writel(CR_FEN | CR_SZ16 | CR_EN, aacirun->base + AACI_TXCR);
 
-	for (i = 0; !(readl(base + AACI_SR) & SR_TXFF) && i < 4096; i++)
-		writel(0, aaci->base + AACI_DR1);
+	for (i = 0; !(readl(aacirun->base + AACI_SR) & SR_TXFF) && i < 4096; i++)
+		writel(0, aacirun->fifo);
 
-	writel(0, base + AACI_TXCR);
+	writel(0, aacirun->base + AACI_TXCR);
 
 	/*
 	 * Re-initialise the AACI after the FIFO depth test, to
@@ -873,6 +1073,12 @@ static int __devinit aaci_probe(struct amba_device *dev, void *id)
 	aaci->playback.base = aaci->base + AACI_CSCH1;
 	aaci->playback.fifo = aaci->base + AACI_DR1;
 
+	/*
+	 * Capture uses AACI channel 0
+	 */
+	aaci->capture.base = aaci->base + AACI_CSCH1;
+	aaci->capture.fifo = aaci->base + AACI_DR1;
+
 	for (i = 0; i < 4; i++) {
 		void __iomem *base = aaci->base + i * 0x14;
 
@@ -908,7 +1114,7 @@ static int __devinit aaci_probe(struct amba_device *dev, void *id)
 	ret = snd_card_register(aaci->card);
 	if (ret == 0) {
 		dev_info(&dev->dev, "%s, fifo %d\n", aaci->card->longname,
-			aaci->fifosize);
+			 aaci->fifosize);
 		amba_set_drvdata(dev, aaci->card);
 		return ret;
 	}

sound/arm/aaci.h

@@ -49,27 +49,27 @@
 #define AACI_DR4	0x0f0	/* data read/written fifo 4 */
 
 /*
- * transmit fifo control register. P48
+ * TX/RX fifo control register (CR). P48
  */
-#define TXCR_FEN	(1 << 16)	/* fifo enable */
-#define TXCR_COMPACT	(1 << 15)	/* compact mode */
-#define TXCR_TSZ16	(0 << 13)	/* 16 bits */
-#define TXCR_TSZ18	(1 << 13)	/* 18 bits */
-#define TXCR_TSZ20	(2 << 13)	/* 20 bits */
-#define TXCR_TSZ12	(3 << 13)	/* 12 bits */
-#define TXCR_TX12	(1 << 12)	/* transmits slot 12 */
-#define TXCR_TX11	(1 << 11)	/* transmits slot 12 */
-#define TXCR_TX10	(1 << 10)	/* transmits slot 12 */
-#define TXCR_TX9	(1 << 9)	/* transmits slot 12 */
-#define TXCR_TX8	(1 << 8)	/* transmits slot 12 */
-#define TXCR_TX7	(1 << 7)	/* transmits slot 12 */
-#define TXCR_TX6	(1 << 6)	/* transmits slot 12 */
-#define TXCR_TX5	(1 << 5)	/* transmits slot 12 */
-#define TXCR_TX4	(1 << 4)	/* transmits slot 12 */
-#define TXCR_TX3	(1 << 3)	/* transmits slot 12 */
-#define TXCR_TX2	(1 << 2)	/* transmits slot 12 */
-#define TXCR_TX1	(1 << 1)	/* transmits slot 12 */
-#define TXCR_TXEN	(1 << 0)	/* transmit enable */
+#define CR_FEN		(1 << 16)	/* fifo enable */
+#define CR_COMPACT	(1 << 15)	/* compact mode */
+#define CR_SZ16		(0 << 13)	/* 16 bits */
+#define CR_SZ18		(1 << 13)	/* 18 bits */
+#define CR_SZ20		(2 << 13)	/* 20 bits */
+#define CR_SZ12		(3 << 13)	/* 12 bits */
+#define CR_SL12		(1 << 12)
+#define CR_SL11		(1 << 11)
+#define CR_SL10		(1 << 10)
+#define CR_SL9		(1 << 9)
+#define CR_SL8		(1 << 8)
+#define CR_SL7		(1 << 7)
+#define CR_SL6		(1 << 6)
+#define CR_SL5		(1 << 5)
+#define CR_SL4		(1 << 4)
+#define CR_SL3		(1 << 3)
+#define CR_SL2		(1 << 2)
+#define CR_SL1		(1 << 1)
+#define CR_EN		(1 << 0)	/* transmit enable */
 
 /*
  * status register bits. P49
@@ -229,6 +229,7 @@ struct aaci {
 	/* AC'97 */
 	struct mutex		ac97_sem;
 	ac97_bus_t		*ac97_bus;
+	ac97_t                  *ac97;
 
 	u32			maincr;
 	spinlock_t		lock;