[deliverable/linux.git] / sound / soc / spear / spdif_out.c

/*
 * ALSA SoC SPDIF Out Audio Layer for spear processors
 *
 * Copyright (C) 2012 ST Microelectronics
 * Vipin Kumar <vipin.kumar@st.com>
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <sound/soc.h>
#include <sound/spear_dma.h>
#include <sound/spear_spdif.h>
#include "spdif_out_regs.h"

struct spdif_out_params {
	u32 rate;
	u32 core_freq;
	u32 mute;
};

struct spdif_out_dev {
	struct clk *clk;
	struct spear_dma_data dma_params;
	struct spdif_out_params saved_params;
	u32 running;
	void __iomem *io_base;
};

static void spdif_out_configure(struct spdif_out_dev *host)
{
	writel(SPDIF_OUT_RESET, host->io_base + SPDIF_OUT_SOFT_RST);
	mdelay(1);
	writel(readl(host->io_base + SPDIF_OUT_SOFT_RST) & ~SPDIF_OUT_RESET,
			host->io_base + SPDIF_OUT_SOFT_RST);

	writel(SPDIF_OUT_FDMA_TRIG_16 | SPDIF_OUT_MEMFMT_16_16 |
			SPDIF_OUT_VALID_HW | SPDIF_OUT_USER_HW |
			SPDIF_OUT_CHNLSTA_HW | SPDIF_OUT_PARITY_HW,
			host->io_base + SPDIF_OUT_CFG);

	writel(0x7F, host->io_base + SPDIF_OUT_INT_STA_CLR);
	writel(0x7F, host->io_base + SPDIF_OUT_INT_EN_CLR);
}

static int spdif_out_startup(struct snd_pcm_substream *substream,
		struct snd_soc_dai *cpu_dai)
{
	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
	int ret;

	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
		return -EINVAL;

	snd_soc_dai_set_dma_data(cpu_dai, substream, (void *)&host->dma_params);

	ret = clk_enable(host->clk);
	if (ret)
		return ret;

	host->running = true;
	spdif_out_configure(host);

	return 0;
}

static void spdif_out_shutdown(struct snd_pcm_substream *substream,
		struct snd_soc_dai *dai)
{
	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);

	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
		return;

	clk_disable(host->clk);
	host->running = false;
	snd_soc_dai_set_dma_data(dai, substream, NULL);
}

static void spdif_out_clock(struct spdif_out_dev *host, u32 core_freq,
		u32 rate)
{
	u32 divider, ctrl;

	clk_set_rate(host->clk, core_freq);
	divider = DIV_ROUND_CLOSEST(clk_get_rate(host->clk), (rate * 128));

	ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
	ctrl &= ~SPDIF_DIVIDER_MASK;
	ctrl |= (divider << SPDIF_DIVIDER_SHIFT) & SPDIF_DIVIDER_MASK;
	writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
}

static int spdif_out_hw_params(struct snd_pcm_substream *substream,
		struct snd_pcm_hw_params *params,
		struct snd_soc_dai *dai)
{
	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
	u32 rate, core_freq;

	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
		return -EINVAL;

	rate = params_rate(params);

	switch (rate) {
	case 8000:
	case 16000:
	case 32000:
	case 64000:
		/*
		 * The clock is multiplied by 10 to bring it to feasible range
		 * of frequencies for sscg
		 */
		core_freq = 64000 * 128 * 10;	/* 81.92 MHz */
		break;
	case 5512:
	case 11025:
	case 22050:
	case 44100:
	case 88200:
	case 176400:
		core_freq = 176400 * 128;	/* 22.5792 MHz */
		break;
	case 48000:
	case 96000:
	case 192000:
	default:
		core_freq = 192000 * 128;	/* 24.576 MHz */
		break;
	}

	spdif_out_clock(host, core_freq, rate);
	host->saved_params.core_freq = core_freq;
	host->saved_params.rate = rate;

	return 0;
}

static int spdif_out_trigger(struct snd_pcm_substream *substream, int cmd,
		struct snd_soc_dai *dai)
{
	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
	u32 ctrl;
	int ret = 0;

	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
		return -EINVAL;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
			ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
			ctrl &= ~SPDIF_OPMODE_MASK;
			if (!host->saved_params.mute)
				ctrl |= SPDIF_OPMODE_AUD_DATA |
					SPDIF_STATE_NORMAL;
			else
				ctrl |= SPDIF_OPMODE_MUTE_PCM;
			writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
		break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
		ctrl &= ~SPDIF_OPMODE_MASK;
		ctrl |= SPDIF_OPMODE_OFF;
		writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
		break;

	default:
		ret = -EINVAL;
		break;
	}
	return ret;
}

static int spdif_digital_mute(struct snd_soc_dai *dai, int mute)
{
	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
	u32 val;

	host->saved_params.mute = mute;
	val = readl(host->io_base + SPDIF_OUT_CTRL);
	val &= ~SPDIF_OPMODE_MASK;

	if (mute)
		val |= SPDIF_OPMODE_MUTE_PCM;
	else {
		if (host->running)
			val |= SPDIF_OPMODE_AUD_DATA | SPDIF_STATE_NORMAL;
		else
			val |= SPDIF_OPMODE_OFF;
	}

	writel(val, host->io_base + SPDIF_OUT_CTRL);
	return 0;
}

static int spdif_mute_get(struct snd_kcontrol *kcontrol,
		struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
	struct snd_soc_card *card = codec->card;
	struct snd_soc_pcm_runtime *rtd = card->rtd;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);

	ucontrol->value.integer.value[0] = host->saved_params.mute;
	return 0;
}

static int spdif_mute_put(struct snd_kcontrol *kcontrol,
		struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
	struct snd_soc_card *card = codec->card;
	struct snd_soc_pcm_runtime *rtd = card->rtd;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);

	if (host->saved_params.mute == ucontrol->value.integer.value[0])
		return 0;

	spdif_digital_mute(cpu_dai, ucontrol->value.integer.value[0]);

	return 1;
}
static const struct snd_kcontrol_new spdif_out_controls[] = {
	SOC_SINGLE_BOOL_EXT("IEC958 Playback Switch", 0,
			spdif_mute_get, spdif_mute_put),
};

int spdif_soc_dai_probe(struct snd_soc_dai *dai)
{
	return snd_soc_add_dai_controls(dai, spdif_out_controls,
				ARRAY_SIZE(spdif_out_controls));
}

static const struct snd_soc_dai_ops spdif_out_dai_ops = {
	.digital_mute	= spdif_digital_mute,
	.startup	= spdif_out_startup,
	.shutdown	= spdif_out_shutdown,
	.trigger	= spdif_out_trigger,
	.hw_params	= spdif_out_hw_params,
};

static struct snd_soc_dai_driver spdif_out_dai = {
	.playback = {
		.channels_min = 2,
		.channels_max = 2,
		.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
				 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \
				 SNDRV_PCM_RATE_192000),
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
	.probe = spdif_soc_dai_probe,
	.ops = &spdif_out_dai_ops,
};

static int spdif_out_probe(struct platform_device *pdev)
{
	struct spdif_out_dev *host;
	struct spear_spdif_platform_data *pdata;
	struct resource *res;
	int ret;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -EINVAL;

	if (!devm_request_mem_region(&pdev->dev, res->start,
				resource_size(res), pdev->name)) {
		dev_warn(&pdev->dev, "Failed to get memory resourse\n");
		return -ENOENT;
	}

	host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
	if (!host) {
		dev_warn(&pdev->dev, "kzalloc fail\n");
		return -ENOMEM;
	}

	host->io_base = devm_ioremap(&pdev->dev, res->start,
				resource_size(res));
	if (!host->io_base) {
		dev_warn(&pdev->dev, "ioremap failed\n");
		return -ENOMEM;
	}

	host->clk = clk_get(&pdev->dev, NULL);
	if (IS_ERR(host->clk))
		return PTR_ERR(host->clk);

	pdata = dev_get_platdata(&pdev->dev);

	host->dma_params.data = pdata->dma_params;
	host->dma_params.addr = res->start + SPDIF_OUT_FIFO_DATA;
	host->dma_params.max_burst = 16;
	host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
	host->dma_params.filter = pdata->filter;

	dev_set_drvdata(&pdev->dev, host);

	ret = snd_soc_register_dai(&pdev->dev, &spdif_out_dai);
	if (ret != 0) {
		clk_put(host->clk);
		return ret;
	}

	return 0;
}

static int spdif_out_remove(struct platform_device *pdev)
{
	struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);

	snd_soc_unregister_dai(&pdev->dev);
	dev_set_drvdata(&pdev->dev, NULL);

	clk_put(host->clk);

	return 0;
}

#ifdef CONFIG_PM
static int spdif_out_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);

	if (host->running)
		clk_disable(host->clk);

	return 0;
}

static int spdif_out_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);

	if (host->running) {
		clk_enable(host->clk);
		spdif_out_configure(host);
		spdif_out_clock(host, host->saved_params.core_freq,
				host->saved_params.rate);
	}
	return 0;
}

static SIMPLE_DEV_PM_OPS(spdif_out_dev_pm_ops, spdif_out_suspend, \
		spdif_out_resume);

#define SPDIF_OUT_DEV_PM_OPS (&spdif_out_dev_pm_ops)

#else
#define SPDIF_OUT_DEV_PM_OPS NULL

#endif

static struct platform_driver spdif_out_driver = {
	.probe		= spdif_out_probe,
	.remove		= spdif_out_remove,
	.driver		= {
		.name	= "spdif-out",
		.owner	= THIS_MODULE,
		.pm	= SPDIF_OUT_DEV_PM_OPS,
	},
};

module_platform_driver(spdif_out_driver);

MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
MODULE_DESCRIPTION("SPEAr SPDIF OUT SoC Interface");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:spdif_out");
Commit	Line	Data
e584f9b4 VK	1	/*
	2	* ALSA SoC SPDIF Out Audio Layer for spear processors
	3	*
	4	* Copyright (C) 2012 ST Microelectronics
	5	* Vipin Kumar <vipin.kumar@st.com>
	6	*
	7	* This file is licensed under the terms of the GNU General Public
	8	* License version 2. This program is licensed "as is" without any
	9	* warranty of any kind, whether express or implied.
	10	*/
	11
	12	#include <linux/clk.h>
	13	#include <linux/delay.h>
	14	#include <linux/device.h>
	15	#include <linux/kernel.h>
	16	#include <linux/init.h>
	17	#include <linux/io.h>
	18	#include <linux/ioport.h>
	19	#include <linux/module.h>
	20	#include <linux/platform_device.h>
	21	#include <sound/soc.h>
	22	#include <sound/spear_dma.h>
	23	#include <sound/spear_spdif.h>
	24	#include "spdif_out_regs.h"
	25
	26	struct spdif_out_params {
	27	u32 rate;
	28	u32 core_freq;
	29	u32 mute;
	30	};
	31
	32	struct spdif_out_dev {
	33	struct clk *clk;
	34	struct spear_dma_data dma_params;
	35	struct spdif_out_params saved_params;
	36	u32 running;
	37	void __iomem *io_base;
	38	};
	39
	40	static void spdif_out_configure(struct spdif_out_dev *host)
	41	{
	42	writel(SPDIF_OUT_RESET, host->io_base + SPDIF_OUT_SOFT_RST);
	43	mdelay(1);
	44	writel(readl(host->io_base + SPDIF_OUT_SOFT_RST) & ~SPDIF_OUT_RESET,
	45	host->io_base + SPDIF_OUT_SOFT_RST);
	46
	47	writel(SPDIF_OUT_FDMA_TRIG_16 \| SPDIF_OUT_MEMFMT_16_16 \|
	48	SPDIF_OUT_VALID_HW \| SPDIF_OUT_USER_HW \|
	49	SPDIF_OUT_CHNLSTA_HW \| SPDIF_OUT_PARITY_HW,
	50	host->io_base + SPDIF_OUT_CFG);
	51
	52	writel(0x7F, host->io_base + SPDIF_OUT_INT_STA_CLR);
	53	writel(0x7F, host->io_base + SPDIF_OUT_INT_EN_CLR);
	54	}
	55
	56	static int spdif_out_startup(struct snd_pcm_substream *substream,
	57	struct snd_soc_dai *cpu_dai)
	58	{
	59	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
	60	int ret;
	61
	62	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
	63	return -EINVAL;
	64
65	snd_soc_dai_set_dma_data(cpu_dai, substream, (void *)&host->dma_params);
66
67	ret = clk_enable(host->clk);
68	if (ret)
69	return ret;
70
71	host->running = true;
72	spdif_out_configure(host);
73
74	return 0;
75	}
76
77	static void spdif_out_shutdown(struct snd_pcm_substream *substream,
78	struct snd_soc_dai *dai)
79	{
80	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
81
82	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
83	return;
84
85	clk_disable(host->clk);
86	host->running = false;
87	snd_soc_dai_set_dma_data(dai, substream, NULL);
88	}
89
90	static void spdif_out_clock(struct spdif_out_dev *host, u32 core_freq,
91	u32 rate)
92	{
93	u32 divider, ctrl;
94
95	clk_set_rate(host->clk, core_freq);
96	divider = DIV_ROUND_CLOSEST(clk_get_rate(host->clk), (rate * 128));
97
98	ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
99	ctrl &= ~SPDIF_DIVIDER_MASK;
100	ctrl \|= (divider << SPDIF_DIVIDER_SHIFT) & SPDIF_DIVIDER_MASK;
101	writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
102	}
103
104	static int spdif_out_hw_params(struct snd_pcm_substream *substream,
105	struct snd_pcm_hw_params *params,
106	struct snd_soc_dai *dai)
107	{
108	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
109	u32 rate, core_freq;
110
111	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
112	return -EINVAL;
113
114	rate = params_rate(params);
115
116	switch (rate) {
117	case 8000:
118	case 16000:
119	case 32000:
120	case 64000:
121	/*
122	* The clock is multiplied by 10 to bring it to feasible range
123	* of frequencies for sscg
124	*/
125	core_freq = 64000 * 128 * 10; /* 81.92 MHz */
126	break;
127	case 5512:
128	case 11025:
129	case 22050:
130	case 44100:
131	case 88200:
132	case 176400:
133	core_freq = 176400 * 128; /* 22.5792 MHz */
134	break;
135	case 48000:
136	case 96000:
137	case 192000:
138	default:
139	core_freq = 192000 * 128; /* 24.576 MHz */
140	break;
141	}
142
143	spdif_out_clock(host, core_freq, rate);
144	host->saved_params.core_freq = core_freq;
145	host->saved_params.rate = rate;
146
147	return 0;
148	}
149
150	static int spdif_out_trigger(struct snd_pcm_substream *substream, int cmd,
151	struct snd_soc_dai *dai)
152	{
153	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
154	u32 ctrl;
155	int ret = 0;
156
157	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
158	return -EINVAL;
159
160	switch (cmd) {
161	case SNDRV_PCM_TRIGGER_START:
162	case SNDRV_PCM_TRIGGER_RESUME:
163	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
164	ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
165	ctrl &= ~SPDIF_OPMODE_MASK;
166	if (!host->saved_params.mute)
167	ctrl \|= SPDIF_OPMODE_AUD_DATA \|
168	SPDIF_STATE_NORMAL;
169	else
170	ctrl \|= SPDIF_OPMODE_MUTE_PCM;
171	writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
172	break;
173
174	case SNDRV_PCM_TRIGGER_STOP:
175	case SNDRV_PCM_TRIGGER_SUSPEND:
176	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
177	ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
178	ctrl &= ~SPDIF_OPMODE_MASK;
179	ctrl \|= SPDIF_OPMODE_OFF;
180	writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
181	break;
182
183	default:
184	ret = -EINVAL;
185	break;
186	}
187	return ret;
188	}
189
190	static int spdif_digital_mute(struct snd_soc_dai *dai, int mute)
191	{
192	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
193	u32 val;
194
195	host->saved_params.mute = mute;
196	val = readl(host->io_base + SPDIF_OUT_CTRL);
197	val &= ~SPDIF_OPMODE_MASK;
198
199	if (mute)
200	val \|= SPDIF_OPMODE_MUTE_PCM;
201	else {
202	if (host->running)
203	val \|= SPDIF_OPMODE_AUD_DATA \| SPDIF_STATE_NORMAL;
204	else
205	val \|= SPDIF_OPMODE_OFF;
206	}
207
208	writel(val, host->io_base + SPDIF_OUT_CTRL);
209	return 0;
210	}
211
212	static int spdif_mute_get(struct snd_kcontrol *kcontrol,
213	struct snd_ctl_elem_value *ucontrol)
214	{
215	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
216	struct snd_soc_card *card = codec->card;
217	struct snd_soc_pcm_runtime *rtd = card->rtd;
218	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
219	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
220
221	ucontrol->value.integer.value[0] = host->saved_params.mute;
222	return 0;
223	}
224
225	static int spdif_mute_put(struct snd_kcontrol *kcontrol,
226	struct snd_ctl_elem_value *ucontrol)
227	{
228	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
229	struct snd_soc_card *card = codec->card;
230	struct snd_soc_pcm_runtime *rtd = card->rtd;
231	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
232	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
233
234	if (host->saved_params.mute == ucontrol->value.integer.value[0])
235	return 0;
236
237	spdif_digital_mute(cpu_dai, ucontrol->value.integer.value[0]);
238
239	return 1;
240	}
241	static const struct snd_kcontrol_new spdif_out_controls[] = {
242	SOC_SINGLE_BOOL_EXT("IEC958 Playback Switch", 0,
243	spdif_mute_get, spdif_mute_put),
244	};
245
246	int spdif_soc_dai_probe(struct snd_soc_dai *dai)
247	{
248	return snd_soc_add_dai_controls(dai, spdif_out_controls,
249	ARRAY_SIZE(spdif_out_controls));
250	}
251
252	static const struct snd_soc_dai_ops spdif_out_dai_ops = {
253	.digital_mute = spdif_digital_mute,
254	.startup = spdif_out_startup,
255	.shutdown = spdif_out_shutdown,
256	.trigger = spdif_out_trigger,
257	.hw_params = spdif_out_hw_params,
258	};
259
260	static struct snd_soc_dai_driver spdif_out_dai = {
261	.playback = {
262	.channels_min = 2,
263	.channels_max = 2,
264	.rates = (SNDRV_PCM_RATE_32000 \| SNDRV_PCM_RATE_44100 \| \
265	SNDRV_PCM_RATE_48000 \| SNDRV_PCM_RATE_96000 \| \
266	SNDRV_PCM_RATE_192000),
267	.formats = SNDRV_PCM_FMTBIT_S16_LE,
268	},
269	.probe = spdif_soc_dai_probe,
270	.ops = &spdif_out_dai_ops,
271	};
272
273	static int spdif_out_probe(struct platform_device *pdev)
274	{
275	struct spdif_out_dev *host;
276	struct spear_spdif_platform_data *pdata;
277	struct resource *res;
278	int ret;
279
280	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
281	if (!res)
282	return -EINVAL;
283
284	if (!devm_request_mem_region(&pdev->dev, res->start,
285	resource_size(res), pdev->name)) {
286	dev_warn(&pdev->dev, "Failed to get memory resourse\n");
287	return -ENOENT;
288	}
289
290	host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
291	if (!host) {
292	dev_warn(&pdev->dev, "kzalloc fail\n");
293	return -ENOMEM;
294	}
295
296	host->io_base = devm_ioremap(&pdev->dev, res->start,
297	resource_size(res));
298	if (!host->io_base) {
299	dev_warn(&pdev->dev, "ioremap failed\n");
300	return -ENOMEM;
301	}
302
303	host->clk = clk_get(&pdev->dev, NULL);
304	if (IS_ERR(host->clk))
305	return PTR_ERR(host->clk);
306
307	pdata = dev_get_platdata(&pdev->dev);
308
309	host->dma_params.data = pdata->dma_params;
310	host->dma_params.addr = res->start + SPDIF_OUT_FIFO_DATA;
311	host->dma_params.max_burst = 16;
312	host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
313	host->dma_params.filter = pdata->filter;
314
315	dev_set_drvdata(&pdev->dev, host);
316
317	ret = snd_soc_register_dai(&pdev->dev, &spdif_out_dai);
318	if (ret != 0) {
319	clk_put(host->clk);
320	return ret;
321	}
322
323	return 0;
324	}
325
326	static int spdif_out_remove(struct platform_device *pdev)
327	{
328	struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);
329
330	snd_soc_unregister_dai(&pdev->dev);
331	dev_set_drvdata(&pdev->dev, NULL);
332
333	clk_put(host->clk);
334
335	return 0;
336	}
337
338	#ifdef CONFIG_PM
339	static int spdif_out_suspend(struct device *dev)
340	{
341	struct platform_device *pdev = to_platform_device(dev);
342	struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);
343
344	if (host->running)
345	clk_disable(host->clk);
346
347	return 0;
348	}
349
350	static int spdif_out_resume(struct device *dev)
351	{
352	struct platform_device *pdev = to_platform_device(dev);
353	struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);
354
355	if (host->running) {
356	clk_enable(host->clk);
357	spdif_out_configure(host);
358	spdif_out_clock(host, host->saved_params.core_freq,
359	host->saved_params.rate);
360	}
361	return 0;
362	}
363
364	static SIMPLE_DEV_PM_OPS(spdif_out_dev_pm_ops, spdif_out_suspend, \
365	spdif_out_resume);
366
367	#define SPDIF_OUT_DEV_PM_OPS (&spdif_out_dev_pm_ops)
368
369	#else
370	#define SPDIF_OUT_DEV_PM_OPS NULL
371
372	#endif
373
374	static struct platform_driver spdif_out_driver = {
375	.probe = spdif_out_probe,
376	.remove = spdif_out_remove,
377	.driver = {
378	.name = "spdif-out",
379	.owner = THIS_MODULE,
380	.pm = SPDIF_OUT_DEV_PM_OPS,
381	},
382	};
383
384	module_platform_driver(spdif_out_driver);
385
386	MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
387	MODULE_DESCRIPTION("SPEAr SPDIF OUT SoC Interface");
388	MODULE_LICENSE("GPL");
389	MODULE_ALIAS("platform:spdif_out");