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[ALSA] S3C2412: suspend and resume support

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Support for suspend/resume for the S3C2412 ASoC IIS
core driver.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Ben Dooks 2008-01-10 14:48:37 +01:00 committed by Jaroslav Kysela
parent 49646dfa2a
commit 6cab2d3ddd
1 changed files with 63 additions and 0 deletions
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63
sound/soc/s3c24xx/s3c2412-i2s.c
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@ -79,6 +79,10 @@ struct s3c2412_i2s_info {
struct clk *iis_clk;
struct clk *iis_pclk;
struct clk *iis_cclk;
u32 suspend_iismod;
u32 suspend_iiscon;
u32 suspend_iispsr;
};
static struct s3c2412_i2s_info s3c2412_i2s;
@ -641,6 +645,63 @@ static int s3c2412_i2s_probe(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM
static int s3c2412_i2s_suspend(struct platform_device *dev,
struct snd_soc_cpu_dai *dai)
{
struct s3c2412_i2s_info *i2s = &s3c2412_i2s;
u32 iismod;
if (dai->active) {
i2s->suspend_iismod = readl(i2s->regs + S3C2412_IISMOD);
i2s->suspend_iiscon = readl(i2s->regs + S3C2412_IISCON);
i2s->suspend_iispsr = readl(i2s->regs + S3C2412_IISPSR);
/* some basic suspend checks */
iismod = readl(i2s->regs + S3C2412_IISMOD);
if (iismod & S3C2412_IISCON_RXDMA_ACTIVE)
dev_warn(&dev->dev, "%s: RXDMA active?\n", __func__);
if (iismod & S3C2412_IISCON_TXDMA_ACTIVE)
dev_warn(&dev->dev, "%s: TXDMA active?\n", __func__);
if (iismod & S3C2412_IISCON_IIS_ACTIVE)
dev_warn(&dev->dev, "%s: IIS active\n", __func__);
}
return 0;
}
static int s3c2412_i2s_resume(struct platform_device *pdev,
struct snd_soc_cpu_dai *dai)
{
struct s3c2412_i2s_info *i2s = &s3c2412_i2s;
dev_info(&pdev->dev, "dai_active %d, IISMOD %08x, IISCON %08x\n",
dai->active, i2s->suspend_iismod, i2s->suspend_iiscon);
if (dai->active) {
writel(i2s->suspend_iiscon, i2s->regs + S3C2412_IISCON);
writel(i2s->suspend_iismod, i2s->regs + S3C2412_IISMOD);
writel(i2s->suspend_iispsr, i2s->regs + S3C2412_IISPSR);
writel(S3C2412_IISFIC_RXFLUSH | S3C2412_IISFIC_TXFLUSH,
i2s->regs + S3C2412_IISFIC);
ndelay(250);
writel(0x0, i2s->regs + S3C2412_IISFIC);
}
return 0;
}
#else
#define s3c2412_i2s_suspend NULL
#define s3c2412_i2s_resume NULL
#endif /* CONFIG_PM */
#define S3C2412_I2S_RATES \
(SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
@ -651,6 +712,8 @@ struct snd_soc_cpu_dai s3c2412_i2s_dai = {
.id = 0,
.type = SND_SOC_DAI_I2S,
.probe = s3c2412_i2s_probe,
.suspend = s3c2412_i2s_suspend,
.resume = s3c2412_i2s_resume,
.playback = {
.channels_min = 2,
.channels_max = 2,