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authorHans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>2009-04-02 08:21:14 +0200
committerTakashi Iwai <tiwai@suse.de>2009-04-06 03:55:33 +0200
commitdf163587eab15a24cc34cf8434a5657416f8a203 (patch)
tree6c9eeebc72fd8bca19cc6c5f8500e3c505e7c871 /sound
parentc42eec0f193ed408118e20d85ea8c2e69c529993 (diff)
downloadlinux-linaro-df163587eab15a24cc34cf8434a5657416f8a203.tar.gz
ALSA: snd-atmel-ac97c: enable interrupts to catch events for error reporting
This patch will enable interrupts from AC97C and report about error conditions that occurs. On channel A both overrun and underrun will be enabled depending if playback and/or capture are enabled. On the control channel the overrun interrupt is enabled. Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/atmel/ac97c.c77
1 files changed, 76 insertions, 1 deletions
diff --git a/sound/atmel/ac97c.c b/sound/atmel/ac97c.c
index c9bc3458fa2..e8484cb9ac6 100644
--- a/sound/atmel/ac97c.c
+++ b/sound/atmel/ac97c.c
@@ -66,6 +66,7 @@ struct atmel_ac97c {
/* Serialize access to opened variable */
spinlock_t lock;
void __iomem *regs;
+ int irq;
int opened;
int reset_pin;
};
@@ -335,8 +336,16 @@ static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
return -EINVAL;
}
+ /* Enable underrun interrupt on channel A */
+ word |= AC97C_CSR_UNRUN;
+
ac97c_writel(chip, CAMR, word);
+ /* Enable channel A event interrupt */
+ word = ac97c_readl(chip, IMR);
+ word |= AC97C_SR_CAEVT;
+ ac97c_writel(chip, IER, word);
+
/* set variable rate if needed */
if (runtime->rate != 48000) {
word = ac97c_readl(chip, MR);
@@ -402,8 +411,16 @@ static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
return -EINVAL;
}
+ /* Enable overrun interrupt on channel A */
+ word |= AC97C_CSR_OVRUN;
+
ac97c_writel(chip, CAMR, word);
+ /* Enable channel A event interrupt */
+ word = ac97c_readl(chip, IMR);
+ word |= AC97C_SR_CAEVT;
+ ac97c_writel(chip, IER, word);
+
/* set variable rate if needed */
if (runtime->rate != 48000) {
word = ac97c_readl(chip, MR);
@@ -554,6 +571,43 @@ static struct snd_pcm_ops atmel_ac97_capture_ops = {
.pointer = atmel_ac97c_capture_pointer,
};
+static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
+{
+ struct atmel_ac97c *chip = (struct atmel_ac97c *)dev;
+ irqreturn_t retval = IRQ_NONE;
+ u32 sr = ac97c_readl(chip, SR);
+ u32 casr = ac97c_readl(chip, CASR);
+ u32 cosr = ac97c_readl(chip, COSR);
+
+ if (sr & AC97C_SR_CAEVT) {
+ dev_info(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n",
+ casr & AC97C_CSR_OVRUN ? " OVRUN" : "",
+ casr & AC97C_CSR_RXRDY ? " RXRDY" : "",
+ casr & AC97C_CSR_UNRUN ? " UNRUN" : "",
+ casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
+ casr & AC97C_CSR_TXRDY ? " TXRDY" : "",
+ !casr ? " NONE" : "");
+ retval = IRQ_HANDLED;
+ }
+
+ if (sr & AC97C_SR_COEVT) {
+ dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n",
+ cosr & AC97C_CSR_OVRUN ? " OVRUN" : "",
+ cosr & AC97C_CSR_RXRDY ? " RXRDY" : "",
+ cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
+ cosr & AC97C_CSR_TXRDY ? " TXRDY" : "",
+ !cosr ? " NONE" : "");
+ retval = IRQ_HANDLED;
+ }
+
+ if (retval == IRQ_NONE) {
+ dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x "
+ "casr 0x%08x cosr 0x%08x\n", sr, casr, cosr);
+ }
+
+ return retval;
+}
+
static int __devinit atmel_ac97c_pcm_new(struct atmel_ac97c *chip)
{
struct snd_pcm *pcm;
@@ -701,6 +755,7 @@ static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
.read = atmel_ac97c_read,
};
int retval;
+ int irq;
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!regs) {
@@ -714,6 +769,12 @@ static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
return -ENXIO;
}
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_dbg(&pdev->dev, "could not get irq\n");
+ return -ENXIO;
+ }
+
pclk = clk_get(&pdev->dev, "pclk");
if (IS_ERR(pclk)) {
dev_dbg(&pdev->dev, "no peripheral clock\n");
@@ -730,6 +791,13 @@ static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
chip = get_chip(card);
+ retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip);
+ if (retval) {
+ dev_dbg(&pdev->dev, "unable to request irq %d\n", irq);
+ goto err_request_irq;
+ }
+ chip->irq = irq;
+
spin_lock_init(&chip->lock);
strcpy(card->driver, "Atmel AC97C");
@@ -758,6 +826,10 @@ static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
snd_card_set_dev(card, &pdev->dev);
+ /* Enable overrun interrupt from codec channel */
+ ac97c_writel(chip, COMR, AC97C_CSR_OVRUN);
+ ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT);
+
retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus);
if (retval) {
dev_dbg(&pdev->dev, "could not register on ac97 bus\n");
@@ -820,7 +892,7 @@ static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
retval = snd_card_register(card);
if (retval) {
dev_dbg(&pdev->dev, "could not register sound card\n");
- goto err_ac97_bus;
+ goto err_dma;
}
platform_set_drvdata(pdev, card);
@@ -847,6 +919,8 @@ err_ac97_bus:
iounmap(chip->regs);
err_ioremap:
+ free_irq(irq, chip);
+err_request_irq:
snd_card_free(card);
err_snd_card_new:
clk_disable(pclk);
@@ -898,6 +972,7 @@ static int __devexit atmel_ac97c_remove(struct platform_device *pdev)
clk_disable(chip->pclk);
clk_put(chip->pclk);
iounmap(chip->regs);
+ free_irq(chip->irq, chip);
if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
dma_release_channel(chip->dma.rx_chan);