[ALSA] soc - Support suspend and resume of the I2S interface on s3c24xx

Signed-off-by: Graeme Gregory <graeme@openmoko.com>
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>

sound/soc/s3c24xx/s3c24xx-i2s.c

@@ -76,6 +76,10 @@ static struct s3c24xx_pcm_dma_params s3c24xx_i2s_pcm_stereo_in = {
 struct s3c24xx_i2s_info {
 	void __iomem	*regs;
 	struct clk	*iis_clk;
+	u32		iiscon;
+	u32		iismod;
+	u32		iisfcon;
+	u32		iispsr;
 };
 static struct s3c24xx_i2s_info s3c24xx_i2s;
 
@@ -406,6 +410,38 @@ static int s3c24xx_i2s_probe(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_PM
+int s3c24xx_i2s_suspend(struct platform_device *pdev,
+		struct snd_soc_cpu_dai *cpu_dai)
+{
+	s3c24xx_i2s.iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
+	s3c24xx_i2s.iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
+	s3c24xx_i2s.iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
+	s3c24xx_i2s.iispsr = readl(s3c24xx_i2s.regs + S3C2410_IISPSR);
+
+	clk_disable(s3c24xx_i2s.iis_clk);
+
+	return 0;
+}
+
+int s3c24xx_i2s_resume(struct platform_device *pdev,
+		struct snd_soc_cpu_dai *cpu_dai)
+{
+	clk_enable(s3c24xx_i2s.iis_clk);
+
+	writel(s3c24xx_i2s.iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
+	writel(s3c24xx_i2s.iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
+	writel(s3c24xx_i2s.iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
+	writel(s3c24xx_i2s.iispsr, s3c24xx_i2s.regs + S3C2410_IISPSR);
+
+	return 0;
+}
+#else
+#define s3c24xx_i2s_suspend NULL
+#define s3c24xx_i2s_resume NULL
+#endif
+
+
 #define S3C24XX_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 | \
@@ -416,6 +452,8 @@ struct snd_soc_cpu_dai s3c24xx_i2s_dai = {
 	.id = 0,
 	.type = SND_SOC_DAI_I2S,
 	.probe = s3c24xx_i2s_probe,
+	.suspend = s3c24xx_i2s_suspend,
+	.resume = s3c24xx_i2s_resume,
 	.playback = {
 		.channels_min = 2,
 		.channels_max = 2,