[alsa-devel] S3C2412: suspend and resume support
Ben Dooks
ben-alsa at fluff.org
Tue Nov 20 13:33:34 CET 2007
Support for suspend/resume for the S3C2412 ASoC IIS
core driver.
Signed-off-by: Ben Dooks <ben-linux at fluff.org>
diff -urpN -X linux-2.6.24-rc3-asoc1/Documentation/dontdiff linux-2.6.24-rc3-asoc1/sound/soc/s3c24xx/s3c2412-i2s.c linux-2.6.24-rc3-asoc2/sound/soc/s3c24xx/s3c2412-i2s.c
--- linux-2.6.24-rc3-asoc1/sound/soc/s3c24xx/s3c2412-i2s.c 2007-11-19 21:28:16.000000000 +0000
+++ linux-2.6.24-rc3-asoc2/sound/soc/s3c24xx/s3c2412-i2s.c 2007-11-20 12:29:46.000000000 +0000
@@ -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;
@@ -381,7 +385,7 @@ static int s3c2412_i2s_trigger(struct sn
case SNDRV_PCM_TRIGGER_START:
/* On start, ensure that the FIFOs are cleared and reset. */
- writel(capture ? S3C2412_IISFIC_RXFLUSH : S3C2412_IISFIC_TXFLUSH,
+ writel(capture ? S3C2412_IISFIC_RXFLUSH : S3C2412_IISFIC_TXFLUSH ,
s3c2412_i2s.regs + S3C2412_IISFIC);
/* clear again, just in case */
@@ -645,6 +649,63 @@ static int s3c2412_i2s_probe(struct plat
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 | \
@@ -655,6 +716,8 @@ 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,
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