ASoC: Add s3c64xx-i2s support

Add the initial code to support the S3C64XX I2S hardware using the
s3c-i2s-v2 core code.

Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 220 insertions, 0 deletions

diff --git a/sound/soc/s3c24xx/s3c64xx-i2s.c b/sound/soc/s3c24xx/s3c64xx-i2s.c
new file mode 100644
index 000000000000..6e1e85dc1ff2
--- /dev/null
+++ b/sound/soc/s3c24xx/s3c64xx-i2s.c
@@ -0,0 +1,220 @@
+/* sound/soc/s3c24xx/s3c64xx-i2s.c
+ *
+ * ALSA SoC Audio Layer - S3C64XX I2S driver
+ *
+ * Copyright 2008 Openmoko, Inc.
+ * Copyright 2008 Simtec Electronics
+ *      Ben Dooks <ben@simtec.co.uk>
+ *      http://armlinux.simtec.co.uk/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/kernel.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+#include <plat/regs-s3c2412-iis.h>
+#include <plat/gpio-bank-d.h>
+#include <plat/gpio-bank-e.h>
+#include <plat/gpio-cfg.h>
+#include <plat/audio.h>
+
+#include <mach/map.h>
+#include <mach/dma.h>
+
+#include "s3c24xx-pcm.h"
+#include "s3c64xx-i2s.h"
+
+static struct s3c2410_dma_client s3c64xx_dma_client_out = {
+	.name		= "I2S PCM Stereo out"
+};
+
+static struct s3c2410_dma_client s3c64xx_dma_client_in = {
+	.name		= "I2S PCM Stereo in"
+};
+
+static struct s3c24xx_pcm_dma_params s3c64xx_i2s_pcm_stereo_out[2] = {
+	[0] = {
+		.channel	= DMACH_I2S0_OUT,
+		.client		= &s3c64xx_dma_client_out,
+		.dma_addr	= S3C64XX_PA_IIS0 + S3C2412_IISTXD,
+		.dma_size	= 4,
+	},
+	[1] = {
+		.channel	= DMACH_I2S1_OUT,
+		.client		= &s3c64xx_dma_client_out,
+		.dma_addr	= S3C64XX_PA_IIS1 + S3C2412_IISTXD,
+		.dma_size	= 4,
+	},
+};
+
+static struct s3c24xx_pcm_dma_params s3c64xx_i2s_pcm_stereo_in[2] = {
+	[0] = {
+		.channel	= DMACH_I2S0_IN,
+		.client		= &s3c64xx_dma_client_in,
+		.dma_addr	= S3C64XX_PA_IIS0 + S3C2412_IISRXD,
+		.dma_size	= 4,
+	},
+	[1] = {
+		.channel	= DMACH_I2S1_IN,
+		.client		= &s3c64xx_dma_client_in,
+		.dma_addr	= S3C64XX_PA_IIS1 + S3C2412_IISRXD,
+		.dma_size	= 4,
+	},
+};
+
+static struct s3c_i2sv2_info s3c64xx_i2s[2];
+
+static inline struct s3c_i2sv2_info *to_info(struct snd_soc_dai *cpu_dai)
+{
+	return cpu_dai->private_data;
+}
+
+static int s3c64xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
+				  int clk_id, unsigned int freq, int dir)
+{
+	struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
+	u32 iismod = readl(i2s->regs + S3C2412_IISMOD);
+
+	switch (clk_id) {
+	case S3C64XX_CLKSRC_PCLK:
+		iismod &= ~S3C64XX_IISMOD_IMS_SYSMUX;
+		break;
+
+	case S3C64XX_CLKSRC_MUX:
+		iismod |= S3C64XX_IISMOD_IMS_SYSMUX;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	writel(iismod, i2s->regs + S3C2412_IISMOD);
+
+	return 0;
+}
+
+
+unsigned long s3c64xx_i2s_get_clockrate(struct snd_soc_dai *dai)
+{
+	struct s3c_i2sv2_info *i2s = to_info(dai);
+
+	return clk_get_rate(i2s->iis_cclk);
+}
+EXPORT_SYMBOL_GPL(s3c64xx_i2s_get_clockrate);
+
+static int s3c64xx_i2s_probe(struct platform_device *pdev,
+			     struct snd_soc_dai *dai)
+{
+	struct device *dev = &pdev->dev;
+	struct s3c_i2sv2_info *i2s;
+	int ret;
+
+	dev_dbg(dev, "%s: probing dai %d\n", __func__, pdev->id);
+
+	if (pdev->id < 0 || pdev->id > ARRAY_SIZE(s3c64xx_i2s)) {
+		dev_err(dev, "id %d out of range\n", pdev->id);
+		return -EINVAL;
+	}
+
+	i2s = &s3c64xx_i2s[pdev->id];
+
+	ret = s3c_i2sv2_probe(pdev, dai, i2s,
+			      pdev->id ? S3C64XX_PA_IIS1 : S3C64XX_PA_IIS0);
+	if (ret)
+		return ret;
+
+	i2s->dma_capture = &s3c64xx_i2s_pcm_stereo_in[pdev->id];
+	i2s->dma_playback = &s3c64xx_i2s_pcm_stereo_out[pdev->id];
+
+	i2s->iis_cclk = clk_get(dev, "audio-bus");
+	if (IS_ERR(i2s->iis_cclk)) {
+		dev_err(dev, "failed to get audio-bus");
+		iounmap(i2s->regs);
+		return -ENODEV;
+	}
+
+	/* configure GPIO for i2s port */
+	switch (pdev->id) {
+	case 0:
+		s3c_gpio_cfgpin(S3C64XX_GPD(0), S3C64XX_GPD0_I2S0_CLK);
+		s3c_gpio_cfgpin(S3C64XX_GPD(1), S3C64XX_GPD1_I2S0_CDCLK);
+		s3c_gpio_cfgpin(S3C64XX_GPD(2), S3C64XX_GPD2_I2S0_LRCLK);
+		s3c_gpio_cfgpin(S3C64XX_GPD(3), S3C64XX_GPD3_I2S0_DI);
+		s3c_gpio_cfgpin(S3C64XX_GPD(4), S3C64XX_GPD4_I2S0_D0);
+		break;
+	case 1:
+		s3c_gpio_cfgpin(S3C64XX_GPE(0), S3C64XX_GPE0_I2S1_CLK);
+		s3c_gpio_cfgpin(S3C64XX_GPE(1), S3C64XX_GPE1_I2S1_CDCLK);
+		s3c_gpio_cfgpin(S3C64XX_GPE(2), S3C64XX_GPE2_I2S1_LRCLK);
+		s3c_gpio_cfgpin(S3C64XX_GPE(3), S3C64XX_GPE3_I2S1_DI);
+		s3c_gpio_cfgpin(S3C64XX_GPE(4), S3C64XX_GPE4_I2S1_D0);
+	}
+
+	return 0;
+}
+
+
+#define S3C64XX_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 | \
+	SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
+
+#define S3C64XX_I2S_FMTS \
+	(SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE)
+
+struct snd_soc_dai s3c64xx_i2s_dai = {
+	.name		= "s3c64xx-i2s",
+	.id		= 0,
+	.probe		= s3c64xx_i2s_probe,
+	.playback = {
+		.channels_min	= 2,
+		.channels_max	= 2,
+		.rates		= S3C64XX_I2S_RATES,
+		.formats	= S3C64XX_I2S_FMTS,
+	},
+	.capture = {
+		.channels_min	= 2,
+		.channels_max	= 2,
+		.rates		= S3C64XX_I2S_RATES,
+		.formats	= S3C64XX_I2S_FMTS,
+	},
+	.ops = {
+		.set_sysclk	= s3c64xx_i2s_set_sysclk,
+	},
+};
+EXPORT_SYMBOL_GPL(s3c64xx_i2s_dai);
+
+static int __init s3c64xx_i2s_init(void)
+{
+	return  s3c_i2sv2_register_dai(&s3c64xx_i2s_dai);
+}
+module_init(s3c64xx_i2s_init);
+
+static void __exit s3c64xx_i2s_exit(void)
+{
+	snd_soc_unregister_dai(&s3c64xx_i2s_dai);
+}
+module_exit(s3c64xx_i2s_exit);
+
+/* Module information */
+MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
+MODULE_DESCRIPTION("S3C64XX I2S SoC Interface");
+MODULE_LICENSE("GPL");
+
+
+