[ALSA] S3C2412: suspend and resume support

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>

1 files changed, 63 insertions, 0 deletions

diff --git a/sound/soc/s3c24xx/s3c2412-i2s.c b/sound/soc/s3c24xx/s3c2412-i2s.c
index b10f7ffa9424..c4a46dd589b3 100644
--- a/sound/soc/s3c24xx/s3c2412-i2s.c
+++ b/sound/soc/s3c24xx/s3c2412-i2s.c
@@ -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,