[deliverable/linux.git] / sound / soc / samsung / smdk_spdif.c

/*
 * smdk_spdif.c  --  S/PDIF audio for SMDK
 *
 * Copyright 2010 Samsung Electronics Co. Ltd.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 */

#include <linux/clk.h>

#include <sound/soc.h>

#include "spdif.h"

/* Audio clock settings are belonged to board specific part. Every
 * board can set audio source clock setting which is matched with H/W
 * like this function-'set_audio_clock_heirachy'.
 */
static int set_audio_clock_heirachy(struct platform_device *pdev)
{
	struct clk *fout_epll, *mout_epll, *sclk_audio0, *sclk_spdif;
	int ret = 0;

	fout_epll = clk_get(NULL, "fout_epll");
	if (IS_ERR(fout_epll)) {
		printk(KERN_WARNING "%s: Cannot find fout_epll.\n",
				__func__);
		return -EINVAL;
	}

	mout_epll = clk_get(NULL, "mout_epll");
	if (IS_ERR(mout_epll)) {
		printk(KERN_WARNING "%s: Cannot find mout_epll.\n",
				__func__);
		ret = -EINVAL;
		goto out1;
	}

	sclk_audio0 = clk_get(&pdev->dev, "sclk_audio");
	if (IS_ERR(sclk_audio0)) {
		printk(KERN_WARNING "%s: Cannot find sclk_audio.\n",
				__func__);
		ret = -EINVAL;
		goto out2;
	}

	sclk_spdif = clk_get(NULL, "sclk_spdif");
	if (IS_ERR(sclk_spdif)) {
		printk(KERN_WARNING "%s: Cannot find sclk_spdif.\n",
				__func__);
		ret = -EINVAL;
		goto out3;
	}

	/* Set audio clock hierarchy for S/PDIF */
	clk_set_parent(mout_epll, fout_epll);
	clk_set_parent(sclk_audio0, mout_epll);
	clk_set_parent(sclk_spdif, sclk_audio0);

	clk_put(sclk_spdif);
out3:
	clk_put(sclk_audio0);
out2:
	clk_put(mout_epll);
out1:
	clk_put(fout_epll);

	return ret;
}

/* We should haved to set clock directly on this part because of clock
 * scheme of Samsudng SoCs did not support to set rates from abstrct
 * clock of it's hierarchy.
 */
static int set_audio_clock_rate(unsigned long epll_rate,
				unsigned long audio_rate)
{
	struct clk *fout_epll, *sclk_spdif;

	fout_epll = clk_get(NULL, "fout_epll");
	if (IS_ERR(fout_epll)) {
		printk(KERN_ERR "%s: failed to get fout_epll\n", __func__);
		return -ENOENT;
	}

	clk_set_rate(fout_epll, epll_rate);
	clk_put(fout_epll);

	sclk_spdif = clk_get(NULL, "sclk_spdif");
	if (IS_ERR(sclk_spdif)) {
		printk(KERN_ERR "%s: failed to get sclk_spdif\n", __func__);
		return -ENOENT;
	}

	clk_set_rate(sclk_spdif, audio_rate);
	clk_put(sclk_spdif);

	return 0;
}

static int smdk_hw_params(struct snd_pcm_substream *substream,
		struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	unsigned long pll_out, rclk_rate;
	int ret, ratio;

	switch (params_rate(params)) {
	case 44100:
		pll_out = 45158400;
		break;
	case 32000:
	case 48000:
	case 96000:
		pll_out = 49152000;
		break;
	default:
		return -EINVAL;
	}

	/* Setting ratio to 512fs helps to use S/PDIF with HDMI without
	 * modify S/PDIF ASoC machine driver.
	 */
	ratio = 512;
	rclk_rate = params_rate(params) * ratio;

	/* Set audio source clock rates */
	ret = set_audio_clock_rate(pll_out, rclk_rate);
	if (ret < 0)
		return ret;

	/* Set S/PDIF uses internal source clock */
	ret = snd_soc_dai_set_sysclk(cpu_dai, SND_SOC_SPDIF_INT_MCLK,
					rclk_rate, SND_SOC_CLOCK_IN);
	if (ret < 0)
		return ret;

	return ret;
}

static struct snd_soc_ops smdk_spdif_ops = {
	.hw_params = smdk_hw_params,
};

static struct snd_soc_dai_link smdk_dai = {
	.name = "S/PDIF",
	.stream_name = "S/PDIF PCM Playback",
	.platform_name = "samsung-audio",
	.cpu_dai_name = "samsung-spdif",
	.codec_dai_name = "dit-hifi",
	.codec_name = "spdif-dit",
	.ops = &smdk_spdif_ops,
};

static struct snd_soc_card smdk = {
	.name = "SMDK-S/PDIF",
	.dai_link = &smdk_dai,
	.num_links = 1,
};

static struct platform_device *smdk_snd_spdif_dit_device;
static struct platform_device *smdk_snd_spdif_device;

static int __init smdk_init(void)
{
	int ret;

	smdk_snd_spdif_dit_device = platform_device_alloc("spdif-dit", -1);
	if (!smdk_snd_spdif_dit_device)
		return -ENOMEM;

	ret = platform_device_add(smdk_snd_spdif_dit_device);
	if (ret)
		goto err1;

	smdk_snd_spdif_device = platform_device_alloc("soc-audio", -1);
	if (!smdk_snd_spdif_device) {
		ret = -ENOMEM;
		goto err2;
	}

	platform_set_drvdata(smdk_snd_spdif_device, &smdk);

	ret = platform_device_add(smdk_snd_spdif_device);
	if (ret)
		goto err3;

	/* Set audio clock hierarchy manually */
	ret = set_audio_clock_heirachy(smdk_snd_spdif_device);
	if (ret)
		goto err4;

	return 0;
err4:
	platform_device_del(smdk_snd_spdif_device);
err3:
	platform_device_put(smdk_snd_spdif_device);
err2:
	platform_device_del(smdk_snd_spdif_dit_device);
err1:
	platform_device_put(smdk_snd_spdif_dit_device);
	return ret;
}

static void __exit smdk_exit(void)
{
	platform_device_unregister(smdk_snd_spdif_device);
	platform_device_unregister(smdk_snd_spdif_dit_device);
}

module_init(smdk_init);
module_exit(smdk_exit);

MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>");
MODULE_DESCRIPTION("ALSA SoC SMDK+S/PDIF");
MODULE_LICENSE("GPL");
Commit	Line	Data
b67089e4 SY	1	/*
	2	* smdk_spdif.c -- S/PDIF audio for SMDK
	3	*
	4	* Copyright 2010 Samsung Electronics Co. Ltd.
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License as
	8	* published by the Free Software Foundation; either version 2 of the
	9	* License, or (at your option) any later version.
	10	*
	11	*/
	12
b67089e4 SY	13	#include <linux/clk.h>
b67089e4 SY	14
b67089e4 SY	15	#include <sound/soc.h>
b67089e4 SY	16
b67089e4 SY	17	#include "spdif.h"
	18
	19	/* Audio clock settings are belonged to board specific part. Every
	20	* board can set audio source clock setting which is matched with H/W
	21	* like this function-'set_audio_clock_heirachy'.
	22	*/
	23	static int set_audio_clock_heirachy(struct platform_device *pdev)
	24	{
	25	struct clk fout_epll, mout_epll, sclk_audio0, sclk_spdif;
b0d8bef4	26	int ret = 0;
b67089e4 SY	27
	28	fout_epll = clk_get(NULL, "fout_epll");
	29	if (IS_ERR(fout_epll)) {
	30	printk(KERN_WARNING "%s: Cannot find fout_epll.\n",
	31	__func__);
	32	return -EINVAL;
	33	}
	34
	35	mout_epll = clk_get(NULL, "mout_epll");
8575d933	36	if (IS_ERR(mout_epll)) {
b67089e4 SY	37	printk(KERN_WARNING "%s: Cannot find mout_epll.\n",
	38	__func__);
	39	ret = -EINVAL;
	40	goto out1;
	41	}
	42
	43	sclk_audio0 = clk_get(&pdev->dev, "sclk_audio");
	44	if (IS_ERR(sclk_audio0)) {
	45	printk(KERN_WARNING "%s: Cannot find sclk_audio.\n",
	46	__func__);
	47	ret = -EINVAL;
	48	goto out2;
	49	}
	50
	51	sclk_spdif = clk_get(NULL, "sclk_spdif");
8575d933	52	if (IS_ERR(sclk_spdif)) {
b67089e4 SY	53	printk(KERN_WARNING "%s: Cannot find sclk_spdif.\n",
	54	__func__);
	55	ret = -EINVAL;
	56	goto out3;
	57	}
	58
b595076a	59	/* Set audio clock hierarchy for S/PDIF */
b67089e4 SY	60	clk_set_parent(mout_epll, fout_epll);
	61	clk_set_parent(sclk_audio0, mout_epll);
	62	clk_set_parent(sclk_spdif, sclk_audio0);
	63
	64	clk_put(sclk_spdif);
	65	out3:
	66	clk_put(sclk_audio0);
	67	out2:
	68	clk_put(mout_epll);
	69	out1:
	70	clk_put(fout_epll);
	71
	72	return ret;
	73	}
	74
	75	/* We should haved to set clock directly on this part because of clock
	76	* scheme of Samsudng SoCs did not support to set rates from abstrct
b595076a	77	* clock of it's hierarchy.
b67089e4 SY	78	*/
	79	static int set_audio_clock_rate(unsigned long epll_rate,
	80	unsigned long audio_rate)
	81	{
	82	struct clk fout_epll, sclk_spdif;
	83
	84	fout_epll = clk_get(NULL, "fout_epll");
	85	if (IS_ERR(fout_epll)) {
	86	printk(KERN_ERR "%s: failed to get fout_epll\n", __func__);
	87	return -ENOENT;
	88	}
	89
	90	clk_set_rate(fout_epll, epll_rate);
	91	clk_put(fout_epll);
	92
	93	sclk_spdif = clk_get(NULL, "sclk_spdif");
	94	if (IS_ERR(sclk_spdif)) {
	95	printk(KERN_ERR "%s: failed to get sclk_spdif\n", __func__);
	96	return -ENOENT;
	97	}
	98
	99	clk_set_rate(sclk_spdif, audio_rate);
	100	clk_put(sclk_spdif);
	101
	102	return 0;
	103	}
	104
	105	static int smdk_hw_params(struct snd_pcm_substream *substream,
	106	struct snd_pcm_hw_params *params)
	107	{
	108	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	109	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	110	unsigned long pll_out, rclk_rate;
	111	int ret, ratio;
	112
	113	switch (params_rate(params)) {
	114	case 44100:
	115	pll_out = 45158400;
	116	break;
	117	case 32000:
	118	case 48000:
	119	case 96000:
	120	pll_out = 49152000;
	121	break;
	122	default:
	123	return -EINVAL;
	124	}
	125
	126	/* Setting ratio to 512fs helps to use S/PDIF with HDMI without
	127	* modify S/PDIF ASoC machine driver.
	128	*/
	129	ratio = 512;
	130	rclk_rate = params_rate(params) * ratio;
	131
	132	/* Set audio source clock rates */
	133	ret = set_audio_clock_rate(pll_out, rclk_rate);
	134	if (ret < 0)
	135	return ret;
	136
	137	/* Set S/PDIF uses internal source clock */
	138	ret = snd_soc_dai_set_sysclk(cpu_dai, SND_SOC_SPDIF_INT_MCLK,
	139	rclk_rate, SND_SOC_CLOCK_IN);
	140	if (ret < 0)
	141	return ret;
142
143	return ret;
144	}
145
146	static struct snd_soc_ops smdk_spdif_ops = {
147	.hw_params = smdk_hw_params,
148	};
149
b67089e4 SY	150	static struct snd_soc_dai_link smdk_dai = {
	151	.name = "S/PDIF",
	152	.stream_name = "S/PDIF PCM Playback",
58bb4072	153	.platform_name = "samsung-audio",
b67089e4 SY	154	.cpu_dai_name = "samsung-spdif",
	155	.codec_dai_name = "dit-hifi",
	156	.codec_name = "spdif-dit",
	157	.ops = &smdk_spdif_ops,
	158	};
	159
	160	static struct snd_soc_card smdk = {
	161	.name = "SMDK-S/PDIF",
	162	.dai_link = &smdk_dai,
	163	.num_links = 1,
	164	};
	165
	166	static struct platform_device *smdk_snd_spdif_dit_device;
	167	static struct platform_device *smdk_snd_spdif_device;
	168
	169	static int __init smdk_init(void)
	170	{
	171	int ret;
	172
	173	smdk_snd_spdif_dit_device = platform_device_alloc("spdif-dit", -1);
	174	if (!smdk_snd_spdif_dit_device)
	175	return -ENOMEM;
	176
	177	ret = platform_device_add(smdk_snd_spdif_dit_device);
	178	if (ret)
d482337e	179	goto err1;
b67089e4 SY	180
	181	smdk_snd_spdif_device = platform_device_alloc("soc-audio", -1);
	182	if (!smdk_snd_spdif_device) {
	183	ret = -ENOMEM;
	184	goto err2;
	185	}
	186
	187	platform_set_drvdata(smdk_snd_spdif_device, &smdk);
	188
	189	ret = platform_device_add(smdk_snd_spdif_device);
	190	if (ret)
d482337e	191	goto err3;
b67089e4	192
b595076a	193	/* Set audio clock hierarchy manually */
b67089e4 SY	194	ret = set_audio_clock_heirachy(smdk_snd_spdif_device);
b67089e4 SY	195	if (ret)
d482337e	196	goto err4;
b67089e4 SY	197
b67089e4 SY	198	return 0;
d482337e AL	199	err4:
	200	platform_device_del(smdk_snd_spdif_device);
	201	err3:
b67089e4 SY	202	platform_device_put(smdk_snd_spdif_device);
b67089e4 SY	203	err2:
d482337e AL	204	platform_device_del(smdk_snd_spdif_dit_device);
d482337e AL	205	err1:
b67089e4 SY	206	platform_device_put(smdk_snd_spdif_dit_device);
	207	return ret;
	208	}
	209
	210	static void __exit smdk_exit(void)
	211	{
	212	platform_device_unregister(smdk_snd_spdif_device);
d482337e	213	platform_device_unregister(smdk_snd_spdif_dit_device);
b67089e4 SY	214	}
	215
	216	module_init(smdk_init);
	217	module_exit(smdk_exit);
	218
	219	MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>");
	220	MODULE_DESCRIPTION("ALSA SoC SMDK+S/PDIF");
	221	MODULE_LICENSE("GPL");