[linux-2.6-block.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 DRV_NAME "au1x_dma"

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,
	.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;
	struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
	return snd_soc_component_get_drvdata(component);
}

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 const 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 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_component_driver alchemy_pcm_soc_component = {
	.name		= DRV_NAME,
	.ops		= &alchemy_pcm_ops,
	.pcm_new	= alchemy_pcm_new,
};

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 devm_snd_soc_register_component(&pdev->dev,
					&alchemy_pcm_soc_component, NULL, 0);
}

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

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
781a9fcc KM	24	#define DRV_NAME "au1x_dma"
781a9fcc KM	25
b3c70c9e ML	26	struct pcm_period {
	27	u32 start;
	28	u32 relative_end; /* relative to start of buffer */
	29	struct pcm_period *next;
	30	};
	31
	32	struct audio_stream {
	33	struct snd_pcm_substream *substream;
	34	int dma;
	35	struct pcm_period *buffer;
	36	unsigned int period_size;
	37	unsigned int periods;
	38	};
	39
	40	struct alchemy_pcm_ctx {
	41	struct audio_stream stream[2]; /* playback & capture */
	42	};
	43
	44	static void au1000_release_dma_link(struct audio_stream *stream)
	45	{
	46	struct pcm_period *pointer;
	47	struct pcm_period *pointer_next;
	48
	49	stream->period_size = 0;
	50	stream->periods = 0;
	51	pointer = stream->buffer;
	52	if (!pointer)
	53	return;
	54	do {
	55	pointer_next = pointer->next;
	56	kfree(pointer);
	57	pointer = pointer_next;
	58	} while (pointer != stream->buffer);
	59	stream->buffer = NULL;
	60	}
	61
	62	static int au1000_setup_dma_link(struct audio_stream *stream,
	63	unsigned int period_bytes,
	64	unsigned int periods)
	65	{
	66	struct snd_pcm_substream *substream = stream->substream;
	67	struct snd_pcm_runtime *runtime = substream->runtime;
	68	struct pcm_period *pointer;
	69	unsigned long dma_start;
	70	int i;
	71
	72	dma_start = virt_to_phys(runtime->dma_area);
	73
	74	if (stream->period_size == period_bytes &&
	75	stream->periods == periods)
	76	return 0; /* not changed */
	77
	78	au1000_release_dma_link(stream);
	79
	80	stream->period_size = period_bytes;
	81	stream->periods = periods;
	82
	83	stream->buffer = kmalloc(sizeof(struct pcm_period), GFP_KERNEL);
	84	if (!stream->buffer)
	85	return -ENOMEM;
	86	pointer = stream->buffer;
	87	for (i = 0; i < periods; i++) {
	88	pointer->start = (u32)(dma_start + (i * period_bytes));
	89	pointer->relative_end = (u32) (((i+1) * period_bytes) - 0x1);
90	if (i < periods - 1) {
91	pointer->next = kmalloc(sizeof(struct pcm_period),
92	GFP_KERNEL);
93	if (!pointer->next) {
94	au1000_release_dma_link(stream);
95	return -ENOMEM;
96	}
97	pointer = pointer->next;
98	}
99	}
100	pointer->next = stream->buffer;
101	return 0;
102	}
103
104	static void au1000_dma_stop(struct audio_stream *stream)
105	{
106	if (stream->buffer)
107	disable_dma(stream->dma);
108	}
109
110	static void au1000_dma_start(struct audio_stream *stream)
111	{
112	if (!stream->buffer)
113	return;
114
115	init_dma(stream->dma);
116	if (get_dma_active_buffer(stream->dma) == 0) {
117	clear_dma_done0(stream->dma);
118	set_dma_addr0(stream->dma, stream->buffer->start);
119	set_dma_count0(stream->dma, stream->period_size >> 1);
120	set_dma_addr1(stream->dma, stream->buffer->next->start);
121	set_dma_count1(stream->dma, stream->period_size >> 1);
122	} else {
123	clear_dma_done1(stream->dma);
124	set_dma_addr1(stream->dma, stream->buffer->start);
125	set_dma_count1(stream->dma, stream->period_size >> 1);
126	set_dma_addr0(stream->dma, stream->buffer->next->start);
127	set_dma_count0(stream->dma, stream->period_size >> 1);
128	}
129	enable_dma_buffers(stream->dma);
130	start_dma(stream->dma);
131	}
132
133	static irqreturn_t au1000_dma_interrupt(int irq, void *ptr)
134	{
135	struct audio_stream stream = (struct audio_stream )ptr;
136	struct snd_pcm_substream *substream = stream->substream;
137
138	switch (get_dma_buffer_done(stream->dma)) {
139	case DMA_D0:
140	stream->buffer = stream->buffer->next;
141	clear_dma_done0(stream->dma);
142	set_dma_addr0(stream->dma, stream->buffer->next->start);
143	set_dma_count0(stream->dma, stream->period_size >> 1);
144	enable_dma_buffer0(stream->dma);
145	break;
146	case DMA_D1:
147	stream->buffer = stream->buffer->next;
148	clear_dma_done1(stream->dma);
149	set_dma_addr1(stream->dma, stream->buffer->next->start);
150	set_dma_count1(stream->dma, stream->period_size >> 1);
151	enable_dma_buffer1(stream->dma);
152	break;
153	case (DMA_D0 \| DMA_D1):
154	pr_debug("DMA %d missed interrupt.\n", stream->dma);
155	au1000_dma_stop(stream);
156	au1000_dma_start(stream);
157	break;
158	case (~DMA_D0 & ~DMA_D1):
159	pr_debug("DMA %d empty irq.\n", stream->dma);
160	}
161	snd_pcm_period_elapsed(substream);
162	return IRQ_HANDLED;
163	}
164
165	static const struct snd_pcm_hardware alchemy_pcm_hardware = {
166	.info = SNDRV_PCM_INFO_MMAP \| SNDRV_PCM_INFO_MMAP_VALID \|
167	SNDRV_PCM_INFO_INTERLEAVED \| SNDRV_PCM_INFO_BATCH,
b3c70c9e ML	168	.period_bytes_min = 1024,
	169	.period_bytes_max = 16 * 1024 - 1,
	170	.periods_min = 4,
	171	.periods_max = 255,
	172	.buffer_bytes_max = 128 * 1024,
	173	.fifo_size = 16,
	174	};
	175
	176	static inline struct alchemy_pcm_ctx ss_to_ctx(struct snd_pcm_substream ss)
	177	{
	178	struct snd_soc_pcm_runtime *rtd = ss->private_data;
781a9fcc KM	179	struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
781a9fcc KM	180	return snd_soc_component_get_drvdata(component);
b3c70c9e ML	181	}
	182
	183	static inline struct audio_stream ss_to_as(struct snd_pcm_substream ss)
	184	{
	185	struct alchemy_pcm_ctx *ctx = ss_to_ctx(ss);
	186	return &(ctx->stream[ss->stream]);
	187	}
	188
	189	static int alchemy_pcm_open(struct snd_pcm_substream *substream)
	190	{
	191	struct alchemy_pcm_ctx *ctx = ss_to_ctx(substream);
	192	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	193	int *dmaids, s = substream->stream;
	194	char *name;
	195
	196	dmaids = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	197	if (!dmaids)
	198	return -ENODEV; /* whoa, has ordering changed? */
	199
	200	/* DMA setup */
	201	name = (s == SNDRV_PCM_STREAM_PLAYBACK) ? "audio-tx" : "audio-rx";
	202	ctx->stream[s].dma = request_au1000_dma(dmaids[s], name,
88e24c3a	203	au1000_dma_interrupt, 0,
b3c70c9e ML	204	&ctx->stream[s]);
	205	set_dma_mode(ctx->stream[s].dma,
	206	get_dma_mode(ctx->stream[s].dma) & ~DMA_NC);
	207
	208	ctx->stream[s].substream = substream;
	209	ctx->stream[s].buffer = NULL;
	210	snd_soc_set_runtime_hwparams(substream, &alchemy_pcm_hardware);
	211
	212	return 0;
	213	}
	214
	215	static int alchemy_pcm_close(struct snd_pcm_substream *substream)
	216	{
	217	struct alchemy_pcm_ctx *ctx = ss_to_ctx(substream);
	218	int stype = substream->stream;
	219
	220	ctx->stream[stype].substream = NULL;
	221	free_au1000_dma(ctx->stream[stype].dma);
	222
	223	return 0;
	224	}
	225
	226	static int alchemy_pcm_hw_params(struct snd_pcm_substream *substream,
	227	struct snd_pcm_hw_params *hw_params)
	228	{
	229	struct audio_stream *stream = ss_to_as(substream);
	230	int err;
	231
	232	err = snd_pcm_lib_malloc_pages(substream,
	233	params_buffer_bytes(hw_params));
	234	if (err < 0)
	235	return err;
	236	err = au1000_setup_dma_link(stream,
	237	params_period_bytes(hw_params),
	238	params_periods(hw_params));
	239	if (err)
	240	snd_pcm_lib_free_pages(substream);
	241
	242	return err;
	243	}
	244
	245	static int alchemy_pcm_hw_free(struct snd_pcm_substream *substream)
	246	{
	247	struct audio_stream *stream = ss_to_as(substream);
	248	au1000_release_dma_link(stream);
	249	return snd_pcm_lib_free_pages(substream);
	250	}
	251
	252	static int alchemy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	253	{
	254	struct audio_stream *stream = ss_to_as(substream);
	255	int err = 0;
	256
	257	switch (cmd) {
	258	case SNDRV_PCM_TRIGGER_START:
	259	au1000_dma_start(stream);
	260	break;
	261	case SNDRV_PCM_TRIGGER_STOP:
	262	au1000_dma_stop(stream);
	263	break;
	264	default:
	265	err = -EINVAL;
	266	break;
	267	}
268	return err;
269	}
270
271	static snd_pcm_uframes_t alchemy_pcm_pointer(struct snd_pcm_substream *ss)
272	{
273	struct audio_stream *stream = ss_to_as(ss);
274	long location;
275
276	location = get_dma_residue(stream->dma);
277	location = stream->buffer->relative_end - location;
278	if (location == -1)
279	location = 0;
280	return bytes_to_frames(ss->runtime, location);
281	}
282
e731a870	283	static const struct snd_pcm_ops alchemy_pcm_ops = {
b3c70c9e ML	284	.open = alchemy_pcm_open,
	285	.close = alchemy_pcm_close,
	286	.ioctl = snd_pcm_lib_ioctl,
	287	.hw_params = alchemy_pcm_hw_params,
	288	.hw_free = alchemy_pcm_hw_free,
	289	.trigger = alchemy_pcm_trigger,
	290	.pointer = alchemy_pcm_pointer,
	291	};
	292
b3c70c9e ML	293	static int alchemy_pcm_new(struct snd_soc_pcm_runtime *rtd)
	294	{
	295	struct snd_pcm *pcm = rtd->pcm;
	296
	297	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
	298	snd_dma_continuous_data(GFP_KERNEL), 65536, (4096 * 1024) - 1);
	299
	300	return 0;
	301	}
	302
781a9fcc KM	303	static struct snd_soc_component_driver alchemy_pcm_soc_component = {
781a9fcc KM	304	.name = DRV_NAME,
b3c70c9e ML	305	.ops = &alchemy_pcm_ops,
b3c70c9e ML	306	.pcm_new = alchemy_pcm_new,
b3c70c9e ML	307	};
b3c70c9e ML	308
5c658be0	309	static int alchemy_pcm_drvprobe(struct platform_device *pdev)
b3c70c9e ML	310	{
b3c70c9e ML	311	struct alchemy_pcm_ctx *ctx;
b3c70c9e	312
46c3a02c	313	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
b3c70c9e ML	314	if (!ctx)
	315	return -ENOMEM;
	316
	317	platform_set_drvdata(pdev, ctx);
	318
781a9fcc KM	319	return devm_snd_soc_register_component(&pdev->dev,
781a9fcc KM	320	&alchemy_pcm_soc_component, NULL, 0);
b3c70c9e ML	321	}
	322
	323	static struct platform_driver alchemy_pcmdma_driver = {
	324	.driver = {
	325	.name = "alchemy-pcm-dma",
b3c70c9e ML	326	},
b3c70c9e ML	327	.probe = alchemy_pcm_drvprobe,
b3c70c9e ML	328	};
b3c70c9e ML	329
8a124f9c	330	module_platform_driver(alchemy_pcmdma_driver);
b3c70c9e ML	331
	332	MODULE_LICENSE("GPL");
	333	MODULE_DESCRIPTION("Au1000/Au1500/Au1100 Audio DMA driver");
	334	MODULE_AUTHOR("Manuel Lauss");