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Diffstat (limited to 'sound/atmel/ac97c.c')
-rw-r--r--sound/atmel/ac97c.c128
1 files changed, 109 insertions, 19 deletions
diff --git a/sound/atmel/ac97c.c b/sound/atmel/ac97c.c
index dd72e00e5ae1..0c0f8771656a 100644
--- a/sound/atmel/ac97c.c
+++ b/sound/atmel/ac97c.c
@@ -1,5 +1,5 @@
/*
- * Driver for the Atmel AC97C controller
+ * Driver for Atmel AC97C
*
* Copyright (C) 2005-2009 Atmel Corporation
*
@@ -10,6 +10,7 @@
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/bitmap.h>
+#include <linux/device.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
@@ -65,6 +66,7 @@ struct atmel_ac97c {
/* Serialize access to opened variable */
spinlock_t lock;
void __iomem *regs;
+ int irq;
int opened;
int reset_pin;
};
@@ -150,10 +152,10 @@ static struct snd_pcm_hardware atmel_ac97c_hw = {
.rate_max = 48000,
.channels_min = 1,
.channels_max = 2,
- .buffer_bytes_max = 64 * 4096,
+ .buffer_bytes_max = 2 * 2 * 64 * 2048,
.period_bytes_min = 4096,
.period_bytes_max = 4096,
- .periods_min = 4,
+ .periods_min = 6,
.periods_max = 64,
};
@@ -297,9 +299,11 @@ static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
{
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
- unsigned long word = 0;
+ unsigned long word = ac97c_readl(chip, OCA);
int retval;
+ word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
+
/* assign channels to AC97C channel A */
switch (runtime->channels) {
case 1:
@@ -312,7 +316,6 @@ static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
default:
/* TODO: support more than two channels */
return -EINVAL;
- break;
}
ac97c_writel(chip, OCA, word);
@@ -324,13 +327,25 @@ static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
word |= AC97C_CMR_CEM_LITTLE;
break;
case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
- default:
word &= ~(AC97C_CMR_CEM_LITTLE);
break;
+ default:
+ word = ac97c_readl(chip, OCA);
+ word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
+ ac97c_writel(chip, OCA, word);
+ 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);
@@ -359,9 +374,11 @@ static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
{
struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
- unsigned long word = 0;
+ unsigned long word = ac97c_readl(chip, ICA);
int retval;
+ word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
+
/* assign channels to AC97C channel A */
switch (runtime->channels) {
case 1:
@@ -374,7 +391,6 @@ static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
default:
/* TODO: support more than two channels */
return -EINVAL;
- break;
}
ac97c_writel(chip, ICA, word);
@@ -386,13 +402,25 @@ static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
word |= AC97C_CMR_CEM_LITTLE;
break;
case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
- default:
word &= ~(AC97C_CMR_CEM_LITTLE);
break;
+ default:
+ word = ac97c_readl(chip, ICA);
+ word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
+ ac97c_writel(chip, ICA, word);
+ 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);
@@ -543,6 +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;
@@ -665,17 +730,17 @@ static bool filter(struct dma_chan *chan, void *slave)
static void atmel_ac97c_reset(struct atmel_ac97c *chip)
{
- ac97c_writel(chip, MR, AC97C_MR_WRST);
+ ac97c_writel(chip, MR, 0);
+ ac97c_writel(chip, MR, AC97C_MR_ENA);
+ ac97c_writel(chip, CAMR, 0);
+ ac97c_writel(chip, COMR, 0);
if (gpio_is_valid(chip->reset_pin)) {
gpio_set_value(chip->reset_pin, 0);
/* AC97 v2.2 specifications says minimum 1 us. */
- udelay(10);
+ udelay(2);
gpio_set_value(chip->reset_pin, 1);
}
-
- udelay(1);
- ac97c_writel(chip, MR, AC97C_MR_ENA);
}
static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
@@ -690,6 +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) {
@@ -703,6 +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");
@@ -719,6 +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");
@@ -747,14 +826,18 @@ static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
snd_card_set_dev(card, &pdev->dev);
+ atmel_ac97c_reset(chip);
+
+ /* 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");
goto err_ac97_bus;
}
- atmel_ac97c_reset(chip);
-
retval = atmel_ac97c_mixer_new(chip);
if (retval) {
dev_dbg(&pdev->dev, "could not register ac97 mixer\n");
@@ -773,7 +856,7 @@ static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
chip->dma.rx_chan = dma_request_channel(mask, filter, dws);
dev_info(&chip->pdev->dev, "using %s for DMA RX\n",
- chip->dma.rx_chan->dev->device.bus_id);
+ dev_name(&chip->dma.rx_chan->dev->device));
set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
}
@@ -789,7 +872,7 @@ static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
chip->dma.tx_chan = dma_request_channel(mask, filter, dws);
dev_info(&chip->pdev->dev, "using %s for DMA TX\n",
- chip->dma.tx_chan->dev->device.bus_id);
+ dev_name(&chip->dma.tx_chan->dev->device));
set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
}
@@ -809,7 +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);
@@ -836,6 +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);
@@ -884,9 +969,14 @@ static int __devexit atmel_ac97c_remove(struct platform_device *pdev)
if (gpio_is_valid(chip->reset_pin))
gpio_free(chip->reset_pin);
+ ac97c_writel(chip, CAMR, 0);
+ ac97c_writel(chip, COMR, 0);
+ ac97c_writel(chip, MR, 0);
+
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);
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-12 22:11:39 +0000