[deliverable/linux.git] / sound / soc / au1x / dma.c

/*
 * Au1000/Au1500/Au1100 Audio DMA support.
 *
 * (c) 2011 Manuel Lauss <manuel.lauss@googlemail.com>
 *
 * copied almost verbatim from the old ALSA driver, written by
 *			Charles Eidsness <charles@cooper-street.com>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <asm/mach-au1x00/au1000.h>
#include <asm/mach-au1x00/au1000_dma.h>

#include "psc.h"

#define ALCHEMY_PCM_FMTS					\
	(SNDRV_PCM_FMTBIT_S8     | SNDRV_PCM_FMTBIT_U8 |	\
	 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |	\
	 SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE |	\
	 SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE |	\
	 SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_U32_BE |	\
	 0)

struct pcm_period {
	u32 start;
	u32 relative_end;	/* relative to start of buffer */
	struct pcm_period *next;
};

struct audio_stream {
	struct snd_pcm_substream *substream;
	int dma;
	struct pcm_period *buffer;
	unsigned int period_size;
	unsigned int periods;
};

struct alchemy_pcm_ctx {
	struct audio_stream stream[2];	/* playback & capture */
};

static void au1000_release_dma_link(struct audio_stream *stream)
{
	struct pcm_period *pointer;
	struct pcm_period *pointer_next;

	stream->period_size = 0;
	stream->periods = 0;
	pointer = stream->buffer;
	if (!pointer)
		return;
	do {
		pointer_next = pointer->next;
		kfree(pointer);
		pointer = pointer_next;
	} while (pointer != stream->buffer);
	stream->buffer = NULL;
}

static int au1000_setup_dma_link(struct audio_stream *stream,
				 unsigned int period_bytes,
				 unsigned int periods)
{
	struct snd_pcm_substream *substream = stream->substream;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pcm_period *pointer;
	unsigned long dma_start;
	int i;

	dma_start = virt_to_phys(runtime->dma_area);

	if (stream->period_size == period_bytes &&
	    stream->periods == periods)
		return 0; /* not changed */

	au1000_release_dma_link(stream);

	stream->period_size = period_bytes;
	stream->periods = periods;

	stream->buffer = kmalloc(sizeof(struct pcm_period), GFP_KERNEL);
	if (!stream->buffer)
		return -ENOMEM;
	pointer = stream->buffer;
	for (i = 0; i < periods; i++) {
		pointer->start = (u32)(dma_start + (i * period_bytes));
		pointer->relative_end = (u32) (((i+1) * period_bytes) - 0x1);
		if (i < periods - 1) {
			pointer->next = kmalloc(sizeof(struct pcm_period),
						GFP_KERNEL);
			if (!pointer->next) {
				au1000_release_dma_link(stream);
				return -ENOMEM;
			}
			pointer = pointer->next;
		}
	}
	pointer->next = stream->buffer;
	return 0;
}

static void au1000_dma_stop(struct audio_stream *stream)
{
	if (stream->buffer)
		disable_dma(stream->dma);
}

static void au1000_dma_start(struct audio_stream *stream)
{
	if (!stream->buffer)
		return;

	init_dma(stream->dma);
	if (get_dma_active_buffer(stream->dma) == 0) {
		clear_dma_done0(stream->dma);
		set_dma_addr0(stream->dma, stream->buffer->start);
		set_dma_count0(stream->dma, stream->period_size >> 1);
		set_dma_addr1(stream->dma, stream->buffer->next->start);
		set_dma_count1(stream->dma, stream->period_size >> 1);
	} else {
		clear_dma_done1(stream->dma);
		set_dma_addr1(stream->dma, stream->buffer->start);
		set_dma_count1(stream->dma, stream->period_size >> 1);
		set_dma_addr0(stream->dma, stream->buffer->next->start);
		set_dma_count0(stream->dma, stream->period_size >> 1);
	}
	enable_dma_buffers(stream->dma);
	start_dma(stream->dma);
}

static irqreturn_t au1000_dma_interrupt(int irq, void *ptr)
{
	struct audio_stream *stream = (struct audio_stream *)ptr;
	struct snd_pcm_substream *substream = stream->substream;

	switch (get_dma_buffer_done(stream->dma)) {
	case DMA_D0:
		stream->buffer = stream->buffer->next;
		clear_dma_done0(stream->dma);
		set_dma_addr0(stream->dma, stream->buffer->next->start);
		set_dma_count0(stream->dma, stream->period_size >> 1);
		enable_dma_buffer0(stream->dma);
		break;
	case DMA_D1:
		stream->buffer = stream->buffer->next;
		clear_dma_done1(stream->dma);
		set_dma_addr1(stream->dma, stream->buffer->next->start);
		set_dma_count1(stream->dma, stream->period_size >> 1);
		enable_dma_buffer1(stream->dma);
		break;
	case (DMA_D0 | DMA_D1):
		pr_debug("DMA %d missed interrupt.\n", stream->dma);
		au1000_dma_stop(stream);
		au1000_dma_start(stream);
		break;
	case (~DMA_D0 & ~DMA_D1):
		pr_debug("DMA %d empty irq.\n", stream->dma);
	}
	snd_pcm_period_elapsed(substream);
	return IRQ_HANDLED;
}

static const struct snd_pcm_hardware alchemy_pcm_hardware = {
	.info		  = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
			    SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BATCH,
	.formats	  = ALCHEMY_PCM_FMTS,
	.rates		  = SNDRV_PCM_RATE_8000_192000,
	.rate_min	  = SNDRV_PCM_RATE_8000,
	.rate_max	  = SNDRV_PCM_RATE_192000,
	.channels_min	  = 2,
	.channels_max	  = 2,
	.period_bytes_min = 1024,
	.period_bytes_max = 16 * 1024 - 1,
	.periods_min	  = 4,
	.periods_max	  = 255,
	.buffer_bytes_max = 128 * 1024,
	.fifo_size	  = 16,
};

static inline struct alchemy_pcm_ctx *ss_to_ctx(struct snd_pcm_substream *ss)
{
	struct snd_soc_pcm_runtime *rtd = ss->private_data;
	return snd_soc_platform_get_drvdata(rtd->platform);
}

static inline struct audio_stream *ss_to_as(struct snd_pcm_substream *ss)
{
	struct alchemy_pcm_ctx *ctx = ss_to_ctx(ss);
	return &(ctx->stream[ss->stream]);
}

static int alchemy_pcm_open(struct snd_pcm_substream *substream)
{
	struct alchemy_pcm_ctx *ctx = ss_to_ctx(substream);
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	int *dmaids, s = substream->stream;
	char *name;

	dmaids = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	if (!dmaids)
		return -ENODEV;	/* whoa, has ordering changed? */

	/* DMA setup */
	name = (s == SNDRV_PCM_STREAM_PLAYBACK) ? "audio-tx" : "audio-rx";
	ctx->stream[s].dma = request_au1000_dma(dmaids[s], name,
					au1000_dma_interrupt, 0,
					&ctx->stream[s]);
	set_dma_mode(ctx->stream[s].dma,
		     get_dma_mode(ctx->stream[s].dma) & ~DMA_NC);

	ctx->stream[s].substream = substream;
	ctx->stream[s].buffer = NULL;
	snd_soc_set_runtime_hwparams(substream, &alchemy_pcm_hardware);

	return 0;
}

static int alchemy_pcm_close(struct snd_pcm_substream *substream)
{
	struct alchemy_pcm_ctx *ctx = ss_to_ctx(substream);
	int stype = substream->stream;

	ctx->stream[stype].substream = NULL;
	free_au1000_dma(ctx->stream[stype].dma);

	return 0;
}

static int alchemy_pcm_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *hw_params)
{
	struct audio_stream *stream = ss_to_as(substream);
	int err;

	err = snd_pcm_lib_malloc_pages(substream,
				       params_buffer_bytes(hw_params));
	if (err < 0)
		return err;
	err = au1000_setup_dma_link(stream,
				    params_period_bytes(hw_params),
				    params_periods(hw_params));
	if (err)
		snd_pcm_lib_free_pages(substream);

	return err;
}

static int alchemy_pcm_hw_free(struct snd_pcm_substream *substream)
{
	struct audio_stream *stream = ss_to_as(substream);
	au1000_release_dma_link(stream);
	return snd_pcm_lib_free_pages(substream);
}

static int alchemy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct audio_stream *stream = ss_to_as(substream);
	int err = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		au1000_dma_start(stream);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		au1000_dma_stop(stream);
		break;
	default:
		err = -EINVAL;
		break;
	}
	return err;
}

static snd_pcm_uframes_t alchemy_pcm_pointer(struct snd_pcm_substream *ss)
{
	struct audio_stream *stream = ss_to_as(ss);
	long location;

	location = get_dma_residue(stream->dma);
	location = stream->buffer->relative_end - location;
	if (location == -1)
		location = 0;
	return bytes_to_frames(ss->runtime, location);
}

static struct snd_pcm_ops alchemy_pcm_ops = {
	.open			= alchemy_pcm_open,
	.close			= alchemy_pcm_close,
	.ioctl			= snd_pcm_lib_ioctl,
	.hw_params	        = alchemy_pcm_hw_params,
	.hw_free	        = alchemy_pcm_hw_free,
	.trigger		= alchemy_pcm_trigger,
	.pointer		= alchemy_pcm_pointer,
};

static void alchemy_pcm_free_dma_buffers(struct snd_pcm *pcm)
{
	snd_pcm_lib_preallocate_free_for_all(pcm);
}

static int alchemy_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_pcm *pcm = rtd->pcm;

	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
		snd_dma_continuous_data(GFP_KERNEL), 65536, (4096 * 1024) - 1);

	return 0;
}

static struct snd_soc_platform_driver alchemy_pcm_soc_platform = {
	.ops		= &alchemy_pcm_ops,
	.pcm_new	= alchemy_pcm_new,
	.pcm_free	= alchemy_pcm_free_dma_buffers,
};

static int alchemy_pcm_drvprobe(struct platform_device *pdev)
{
	struct alchemy_pcm_ctx *ctx;

	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
	if (!ctx)
		return -ENOMEM;

	platform_set_drvdata(pdev, ctx);

	return snd_soc_register_platform(&pdev->dev, &alchemy_pcm_soc_platform);
}

static int alchemy_pcm_drvremove(struct platform_device *pdev)
{
	snd_soc_unregister_platform(&pdev->dev);

	return 0;
}

static struct platform_driver alchemy_pcmdma_driver = {
	.driver	= {
		.name	= "alchemy-pcm-dma",
		.owner	= THIS_MODULE,
	},
	.probe		= alchemy_pcm_drvprobe,
	.remove		= alchemy_pcm_drvremove,
};

module_platform_driver(alchemy_pcmdma_driver);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Au1000/Au1500/Au1100 Audio DMA driver");
MODULE_AUTHOR("Manuel Lauss");
Commit	Line	Data
b3c70c9e ML	1	/*
	2	* Au1000/Au1500/Au1100 Audio DMA support.
	3	*
	4	* (c) 2011 Manuel Lauss <manuel.lauss@googlemail.com>
	5	*
	6	* copied almost verbatim from the old ALSA driver, written by
	7	* Charles Eidsness <charles@cooper-street.com>
	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/init.h>
	12	#include <linux/platform_device.h>
	13	#include <linux/slab.h>
	14	#include <linux/dma-mapping.h>
	15	#include <sound/core.h>
	16	#include <sound/pcm.h>
	17	#include <sound/pcm_params.h>
	18	#include <sound/soc.h>
	19	#include <asm/mach-au1x00/au1000.h>
	20	#include <asm/mach-au1x00/au1000_dma.h>
	21
	22	#include "psc.h"
	23
	24	#define ALCHEMY_PCM_FMTS \
	25	(SNDRV_PCM_FMTBIT_S8 \| SNDRV_PCM_FMTBIT_U8 \| \
	26	SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_S16_BE \| \
	27	SNDRV_PCM_FMTBIT_U16_LE \| SNDRV_PCM_FMTBIT_U16_BE \| \
	28	SNDRV_PCM_FMTBIT_S32_LE \| SNDRV_PCM_FMTBIT_S32_BE \| \
	29	SNDRV_PCM_FMTBIT_U32_LE \| SNDRV_PCM_FMTBIT_U32_BE \| \
	30	0)
	31
	32	struct pcm_period {
	33	u32 start;
	34	u32 relative_end; /* relative to start of buffer */
	35	struct pcm_period *next;
	36	};
	37
	38	struct audio_stream {
	39	struct snd_pcm_substream *substream;
	40	int dma;
	41	struct pcm_period *buffer;
	42	unsigned int period_size;
	43	unsigned int periods;
	44	};
	45
	46	struct alchemy_pcm_ctx {
	47	struct audio_stream stream[2]; /* playback & capture */
	48	};
	49
	50	static void au1000_release_dma_link(struct audio_stream *stream)
	51	{
	52	struct pcm_period *pointer;
	53	struct pcm_period *pointer_next;
	54
	55	stream->period_size = 0;
	56	stream->periods = 0;
	57	pointer = stream->buffer;
	58	if (!pointer)
	59	return;
	60	do {
	61	pointer_next = pointer->next;
	62	kfree(pointer);
	63	pointer = pointer_next;
	64	} while (pointer != stream->buffer);
65	stream->buffer = NULL;
66	}
67
68	static int au1000_setup_dma_link(struct audio_stream *stream,
69	unsigned int period_bytes,
70	unsigned int periods)
71	{
72	struct snd_pcm_substream *substream = stream->substream;
73	struct snd_pcm_runtime *runtime = substream->runtime;
74	struct pcm_period *pointer;
75	unsigned long dma_start;
76	int i;
77
78	dma_start = virt_to_phys(runtime->dma_area);
79
80	if (stream->period_size == period_bytes &&
81	stream->periods == periods)
82	return 0; /* not changed */
83
84	au1000_release_dma_link(stream);
85
86	stream->period_size = period_bytes;
87	stream->periods = periods;
88
89	stream->buffer = kmalloc(sizeof(struct pcm_period), GFP_KERNEL);
90	if (!stream->buffer)
91	return -ENOMEM;
92	pointer = stream->buffer;
93	for (i = 0; i < periods; i++) {
94	pointer->start = (u32)(dma_start + (i * period_bytes));
95	pointer->relative_end = (u32) (((i+1) * period_bytes) - 0x1);
96	if (i < periods - 1) {
97	pointer->next = kmalloc(sizeof(struct pcm_period),
98	GFP_KERNEL);
99	if (!pointer->next) {
100	au1000_release_dma_link(stream);
101	return -ENOMEM;
102	}
103	pointer = pointer->next;
104	}
105	}
106	pointer->next = stream->buffer;
107	return 0;
108	}
109
110	static void au1000_dma_stop(struct audio_stream *stream)
111	{
112	if (stream->buffer)
113	disable_dma(stream->dma);
114	}
115
116	static void au1000_dma_start(struct audio_stream *stream)
117	{
118	if (!stream->buffer)
119	return;
120
121	init_dma(stream->dma);
122	if (get_dma_active_buffer(stream->dma) == 0) {
123	clear_dma_done0(stream->dma);
124	set_dma_addr0(stream->dma, stream->buffer->start);
125	set_dma_count0(stream->dma, stream->period_size >> 1);
126	set_dma_addr1(stream->dma, stream->buffer->next->start);
127	set_dma_count1(stream->dma, stream->period_size >> 1);
128	} else {
129	clear_dma_done1(stream->dma);
130	set_dma_addr1(stream->dma, stream->buffer->start);
131	set_dma_count1(stream->dma, stream->period_size >> 1);
132	set_dma_addr0(stream->dma, stream->buffer->next->start);
133	set_dma_count0(stream->dma, stream->period_size >> 1);
134	}
135	enable_dma_buffers(stream->dma);
136	start_dma(stream->dma);
137	}
138
139	static irqreturn_t au1000_dma_interrupt(int irq, void *ptr)
140	{
141	struct audio_stream stream = (struct audio_stream )ptr;
142	struct snd_pcm_substream *substream = stream->substream;
143
144	switch (get_dma_buffer_done(stream->dma)) {
145	case DMA_D0:
146	stream->buffer = stream->buffer->next;
147	clear_dma_done0(stream->dma);
148	set_dma_addr0(stream->dma, stream->buffer->next->start);
149	set_dma_count0(stream->dma, stream->period_size >> 1);
150	enable_dma_buffer0(stream->dma);
151	break;
152	case DMA_D1:
153	stream->buffer = stream->buffer->next;
154	clear_dma_done1(stream->dma);
155	set_dma_addr1(stream->dma, stream->buffer->next->start);
156	set_dma_count1(stream->dma, stream->period_size >> 1);
157	enable_dma_buffer1(stream->dma);
158	break;
159	case (DMA_D0 \| DMA_D1):
160	pr_debug("DMA %d missed interrupt.\n", stream->dma);
161	au1000_dma_stop(stream);
162	au1000_dma_start(stream);
163	break;
164	case (~DMA_D0 & ~DMA_D1):
165	pr_debug("DMA %d empty irq.\n", stream->dma);
166	}
167	snd_pcm_period_elapsed(substream);
168	return IRQ_HANDLED;
169	}
170
171	static const struct snd_pcm_hardware alchemy_pcm_hardware = {
172	.info = SNDRV_PCM_INFO_MMAP \| SNDRV_PCM_INFO_MMAP_VALID \|
173	SNDRV_PCM_INFO_INTERLEAVED \| SNDRV_PCM_INFO_BATCH,
174	.formats = ALCHEMY_PCM_FMTS,
175	.rates = SNDRV_PCM_RATE_8000_192000,
176	.rate_min = SNDRV_PCM_RATE_8000,
177	.rate_max = SNDRV_PCM_RATE_192000,
178	.channels_min = 2,
179	.channels_max = 2,
180	.period_bytes_min = 1024,
181	.period_bytes_max = 16 * 1024 - 1,
182	.periods_min = 4,
183	.periods_max = 255,
184	.buffer_bytes_max = 128 * 1024,
185	.fifo_size = 16,
186	};
187
188	static inline struct alchemy_pcm_ctx ss_to_ctx(struct snd_pcm_substream ss)
189	{
190	struct snd_soc_pcm_runtime *rtd = ss->private_data;
191	return snd_soc_platform_get_drvdata(rtd->platform);
192	}
193
194	static inline struct audio_stream ss_to_as(struct snd_pcm_substream ss)
195	{
196	struct alchemy_pcm_ctx *ctx = ss_to_ctx(ss);
197	return &(ctx->stream[ss->stream]);
198	}
199
200	static int alchemy_pcm_open(struct snd_pcm_substream *substream)
201	{
202	struct alchemy_pcm_ctx *ctx = ss_to_ctx(substream);
203	struct snd_soc_pcm_runtime *rtd = substream->private_data;
204	int *dmaids, s = substream->stream;
205	char *name;
206
207	dmaids = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
208	if (!dmaids)
209	return -ENODEV; /* whoa, has ordering changed? */
210
211	/* DMA setup */
212	name = (s == SNDRV_PCM_STREAM_PLAYBACK) ? "audio-tx" : "audio-rx";
213	ctx->stream[s].dma = request_au1000_dma(dmaids[s], name,
88e24c3a	214	au1000_dma_interrupt, 0,
b3c70c9e ML	215	&ctx->stream[s]);
	216	set_dma_mode(ctx->stream[s].dma,
	217	get_dma_mode(ctx->stream[s].dma) & ~DMA_NC);
	218
	219	ctx->stream[s].substream = substream;
	220	ctx->stream[s].buffer = NULL;
	221	snd_soc_set_runtime_hwparams(substream, &alchemy_pcm_hardware);
	222
	223	return 0;
	224	}
	225
	226	static int alchemy_pcm_close(struct snd_pcm_substream *substream)
	227	{
	228	struct alchemy_pcm_ctx *ctx = ss_to_ctx(substream);
	229	int stype = substream->stream;
	230
	231	ctx->stream[stype].substream = NULL;
	232	free_au1000_dma(ctx->stream[stype].dma);
	233
	234	return 0;
	235	}
	236
	237	static int alchemy_pcm_hw_params(struct snd_pcm_substream *substream,
	238	struct snd_pcm_hw_params *hw_params)
	239	{
	240	struct audio_stream *stream = ss_to_as(substream);
	241	int err;
	242
	243	err = snd_pcm_lib_malloc_pages(substream,
	244	params_buffer_bytes(hw_params));
	245	if (err < 0)
	246	return err;
	247	err = au1000_setup_dma_link(stream,
	248	params_period_bytes(hw_params),
	249	params_periods(hw_params));
	250	if (err)
	251	snd_pcm_lib_free_pages(substream);
	252
	253	return err;
	254	}
	255
	256	static int alchemy_pcm_hw_free(struct snd_pcm_substream *substream)
	257	{
	258	struct audio_stream *stream = ss_to_as(substream);
	259	au1000_release_dma_link(stream);
	260	return snd_pcm_lib_free_pages(substream);
	261	}
	262
	263	static int alchemy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	264	{
	265	struct audio_stream *stream = ss_to_as(substream);
	266	int err = 0;
	267
	268	switch (cmd) {
	269	case SNDRV_PCM_TRIGGER_START:
	270	au1000_dma_start(stream);
	271	break;
	272	case SNDRV_PCM_TRIGGER_STOP:
	273	au1000_dma_stop(stream);
	274	break;
	275	default:
	276	err = -EINVAL;
	277	break;
	278	}
279	return err;
280	}
281
282	static snd_pcm_uframes_t alchemy_pcm_pointer(struct snd_pcm_substream *ss)
283	{
284	struct audio_stream *stream = ss_to_as(ss);
285	long location;
286
287	location = get_dma_residue(stream->dma);
288	location = stream->buffer->relative_end - location;
289	if (location == -1)
290	location = 0;
291	return bytes_to_frames(ss->runtime, location);
292	}
293
294	static struct snd_pcm_ops alchemy_pcm_ops = {
295	.open = alchemy_pcm_open,
296	.close = alchemy_pcm_close,
297	.ioctl = snd_pcm_lib_ioctl,
298	.hw_params = alchemy_pcm_hw_params,
299	.hw_free = alchemy_pcm_hw_free,
300	.trigger = alchemy_pcm_trigger,
301	.pointer = alchemy_pcm_pointer,
302	};
303
304	static void alchemy_pcm_free_dma_buffers(struct snd_pcm *pcm)
305	{
306	snd_pcm_lib_preallocate_free_for_all(pcm);
307	}
308
309	static int alchemy_pcm_new(struct snd_soc_pcm_runtime *rtd)
310	{
311	struct snd_pcm *pcm = rtd->pcm;
312
313	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
314	snd_dma_continuous_data(GFP_KERNEL), 65536, (4096 * 1024) - 1);
315
316	return 0;
317	}
318
796ba900	319	static struct snd_soc_platform_driver alchemy_pcm_soc_platform = {
b3c70c9e ML	320	.ops = &alchemy_pcm_ops,
	321	.pcm_new = alchemy_pcm_new,
	322	.pcm_free = alchemy_pcm_free_dma_buffers,
	323	};
	324
5c658be0	325	static int alchemy_pcm_drvprobe(struct platform_device *pdev)
b3c70c9e ML	326	{
b3c70c9e ML	327	struct alchemy_pcm_ctx *ctx;
b3c70c9e	328
46c3a02c	329	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
b3c70c9e ML	330	if (!ctx)
	331	return -ENOMEM;
	332
	333	platform_set_drvdata(pdev, ctx);
	334
46c3a02c	335	return snd_soc_register_platform(&pdev->dev, &alchemy_pcm_soc_platform);
b3c70c9e ML	336	}
b3c70c9e ML	337
5c658be0	338	static int alchemy_pcm_drvremove(struct platform_device *pdev)
b3c70c9e	339	{
b3c70c9e	340	snd_soc_unregister_platform(&pdev->dev);
b3c70c9e ML	341
	342	return 0;
	343	}
	344
	345	static struct platform_driver alchemy_pcmdma_driver = {
	346	.driver = {
	347	.name = "alchemy-pcm-dma",
	348	.owner = THIS_MODULE,
	349	},
	350	.probe = alchemy_pcm_drvprobe,
5c658be0	351	.remove = alchemy_pcm_drvremove,
b3c70c9e ML	352	};
b3c70c9e ML	353
8a124f9c	354	module_platform_driver(alchemy_pcmdma_driver);
b3c70c9e ML	355
	356	MODULE_LICENSE("GPL");
	357	MODULE_DESCRIPTION("Au1000/Au1500/Au1100 Audio DMA driver");
	358	MODULE_AUTHOR("Manuel Lauss");