[ARM] 4139/1: AACI record support

Add PCM audio capture support for AACI audio on Versatile platform.

Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 253 insertions, 46 deletions

diff --git a/sound/arm/aaci.c b/sound/arm/aaci.c
index b85df793cdce..a032aee82adf 100644
--- a/sound/arm/aaci.c
+++ b/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;
         }
diff --git a/sound/arm/aaci.h b/sound/arm/aaci.h
index 06295190606c..788c24afaf9f 100644
--- a/sound/arm/aaci.h
+++ b/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;