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@@ -79,6 +79,10 @@ struct s3c2412_i2s_info {
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struct clk *iis_clk;
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struct clk *iis_pclk;
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struct clk *iis_cclk;
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+
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+ u32 suspend_iismod;
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+ u32 suspend_iiscon;
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+ u32 suspend_iispsr;
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};
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static struct s3c2412_i2s_info s3c2412_i2s;
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@@ -641,6 +645,63 @@ static int s3c2412_i2s_probe(struct platform_device *pdev)
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return 0;
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}
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+#ifdef CONFIG_PM
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+static int s3c2412_i2s_suspend(struct platform_device *dev,
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+ struct snd_soc_cpu_dai *dai)
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+{
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+ struct s3c2412_i2s_info *i2s = &s3c2412_i2s;
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+ u32 iismod;
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+
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+ if (dai->active) {
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+ i2s->suspend_iismod = readl(i2s->regs + S3C2412_IISMOD);
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+ i2s->suspend_iiscon = readl(i2s->regs + S3C2412_IISCON);
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+ i2s->suspend_iispsr = readl(i2s->regs + S3C2412_IISPSR);
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+
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+ /* some basic suspend checks */
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+
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+ iismod = readl(i2s->regs + S3C2412_IISMOD);
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+
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+ if (iismod & S3C2412_IISCON_RXDMA_ACTIVE)
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+ dev_warn(&dev->dev, "%s: RXDMA active?\n", __func__);
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+
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+ if (iismod & S3C2412_IISCON_TXDMA_ACTIVE)
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+ dev_warn(&dev->dev, "%s: TXDMA active?\n", __func__);
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+
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+ if (iismod & S3C2412_IISCON_IIS_ACTIVE)
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+ dev_warn(&dev->dev, "%s: IIS active\n", __func__);
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+ }
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+
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+ return 0;
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+}
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+
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+static int s3c2412_i2s_resume(struct platform_device *pdev,
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+ struct snd_soc_cpu_dai *dai)
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+{
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+ struct s3c2412_i2s_info *i2s = &s3c2412_i2s;
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+
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+ dev_info(&pdev->dev, "dai_active %d, IISMOD %08x, IISCON %08x\n",
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+ dai->active, i2s->suspend_iismod, i2s->suspend_iiscon);
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+
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+ if (dai->active) {
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+ writel(i2s->suspend_iiscon, i2s->regs + S3C2412_IISCON);
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+ writel(i2s->suspend_iismod, i2s->regs + S3C2412_IISMOD);
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+ writel(i2s->suspend_iispsr, i2s->regs + S3C2412_IISPSR);
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+
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+ writel(S3C2412_IISFIC_RXFLUSH | S3C2412_IISFIC_TXFLUSH,
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+ i2s->regs + S3C2412_IISFIC);
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+
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+ ndelay(250);
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+ writel(0x0, i2s->regs + S3C2412_IISFIC);
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+
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+ }
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+
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+ return 0;
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+}
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+#else
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+#define s3c2412_i2s_suspend NULL
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+#define s3c2412_i2s_resume NULL
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+#endif /* CONFIG_PM */
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+
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#define S3C2412_I2S_RATES \
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(SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
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SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
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@@ -651,6 +712,8 @@ struct snd_soc_cpu_dai s3c2412_i2s_dai = {
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.id = 0,
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.type = SND_SOC_DAI_I2S,
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.probe = s3c2412_i2s_probe,
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+ .suspend = s3c2412_i2s_suspend,
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+ .resume = s3c2412_i2s_resume,
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.playback = {
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.channels_min = 2,
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.channels_max = 2,
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