[linux-block.git] / sound / soc / au1x / dma.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
b3c70c9e ML	2	/*
	3	* Au1000/Au1500/Au1100 Audio DMA support.
	4	*
	5	* (c) 2011 Manuel Lauss <manuel.lauss@googlemail.com>
	6	*
	7	* copied almost verbatim from the old ALSA driver, written by
	8	* Charles Eidsness <charles@cooper-street.com>
	9	*/
	10
	11	#include <linux/module.h>
	12	#include <linux/init.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/slab.h>
	15	#include <linux/dma-mapping.h>
	16	#include <sound/core.h>
	17	#include <sound/pcm.h>
	18	#include <sound/pcm_params.h>
	19	#include <sound/soc.h>
	20	#include <asm/mach-au1x00/au1000.h>
	21	#include <asm/mach-au1x00/au1000_dma.h>
	22
	23	#include "psc.h"
	24
781a9fcc KM	25	#define DRV_NAME "au1x_dma"
781a9fcc KM	26
b3c70c9e ML	27	struct pcm_period {
	28	u32 start;
	29	u32 relative_end; /* relative to start of buffer */
	30	struct pcm_period *next;
	31	};
	32
	33	struct audio_stream {
	34	struct snd_pcm_substream *substream;
	35	int dma;
	36	struct pcm_period *buffer;
	37	unsigned int period_size;
	38	unsigned int periods;
	39	};
	40
	41	struct alchemy_pcm_ctx {
	42	struct audio_stream stream[2]; /* playback & capture */
	43	};
	44
	45	static void au1000_release_dma_link(struct audio_stream *stream)
	46	{
	47	struct pcm_period *pointer;
	48	struct pcm_period *pointer_next;
	49
	50	stream->period_size = 0;
	51	stream->periods = 0;
	52	pointer = stream->buffer;
	53	if (!pointer)
	54	return;
	55	do {
	56	pointer_next = pointer->next;
	57	kfree(pointer);
	58	pointer = pointer_next;
	59	} while (pointer != stream->buffer);
	60	stream->buffer = NULL;
	61	}
	62
	63	static int au1000_setup_dma_link(struct audio_stream *stream,
	64	unsigned int period_bytes,
	65	unsigned int periods)
	66	{
	67	struct snd_pcm_substream *substream = stream->substream;
	68	struct snd_pcm_runtime *runtime = substream->runtime;
	69	struct pcm_period *pointer;
	70	unsigned long dma_start;
	71	int i;
	72
	73	dma_start = virt_to_phys(runtime->dma_area);
	74
	75	if (stream->period_size == period_bytes &&
	76	stream->periods == periods)
	77	return 0; /* not changed */
	78
	79	au1000_release_dma_link(stream);
	80
	81	stream->period_size = period_bytes;
	82	stream->periods = periods;
	83
	84	stream->buffer = kmalloc(sizeof(struct pcm_period), GFP_KERNEL);
	85	if (!stream->buffer)
	86	return -ENOMEM;
	87	pointer = stream->buffer;
	88	for (i = 0; i < periods; i++) {
	89	pointer->start = (u32)(dma_start + (i * period_bytes));
	90	pointer->relative_end = (u32) (((i+1) * period_bytes) - 0x1);
91	if (i < periods - 1) {
92	pointer->next = kmalloc(sizeof(struct pcm_period),
93	GFP_KERNEL);
94	if (!pointer->next) {
95	au1000_release_dma_link(stream);
96	return -ENOMEM;
97	}
98	pointer = pointer->next;
99	}
100	}
101	pointer->next = stream->buffer;
102	return 0;
103	}
104
105	static void au1000_dma_stop(struct audio_stream *stream)
106	{
107	if (stream->buffer)
108	disable_dma(stream->dma);
109	}
110
111	static void au1000_dma_start(struct audio_stream *stream)
112	{
113	if (!stream->buffer)
114	return;
115
116	init_dma(stream->dma);
117	if (get_dma_active_buffer(stream->dma) == 0) {
118	clear_dma_done0(stream->dma);
119	set_dma_addr0(stream->dma, stream->buffer->start);
120	set_dma_count0(stream->dma, stream->period_size >> 1);
121	set_dma_addr1(stream->dma, stream->buffer->next->start);
122	set_dma_count1(stream->dma, stream->period_size >> 1);
123	} else {
124	clear_dma_done1(stream->dma);
125	set_dma_addr1(stream->dma, stream->buffer->start);
126	set_dma_count1(stream->dma, stream->period_size >> 1);
127	set_dma_addr0(stream->dma, stream->buffer->next->start);
128	set_dma_count0(stream->dma, stream->period_size >> 1);
129	}
130	enable_dma_buffers(stream->dma);
131	start_dma(stream->dma);
132	}
133
134	static irqreturn_t au1000_dma_interrupt(int irq, void *ptr)
135	{
136	struct audio_stream stream = (struct audio_stream )ptr;
137	struct snd_pcm_substream *substream = stream->substream;
138
139	switch (get_dma_buffer_done(stream->dma)) {
140	case DMA_D0:
141	stream->buffer = stream->buffer->next;
142	clear_dma_done0(stream->dma);
143	set_dma_addr0(stream->dma, stream->buffer->next->start);
144	set_dma_count0(stream->dma, stream->period_size >> 1);
145	enable_dma_buffer0(stream->dma);
146	break;
147	case DMA_D1:
148	stream->buffer = stream->buffer->next;
149	clear_dma_done1(stream->dma);
150	set_dma_addr1(stream->dma, stream->buffer->next->start);
151	set_dma_count1(stream->dma, stream->period_size >> 1);
152	enable_dma_buffer1(stream->dma);
153	break;
154	case (DMA_D0 \| DMA_D1):
155	pr_debug("DMA %d missed interrupt.\n", stream->dma);
156	au1000_dma_stop(stream);
157	au1000_dma_start(stream);
158	break;
159	case (~DMA_D0 & ~DMA_D1):
160	pr_debug("DMA %d empty irq.\n", stream->dma);
161	}
162	snd_pcm_period_elapsed(substream);
163	return IRQ_HANDLED;
164	}
165
166	static const struct snd_pcm_hardware alchemy_pcm_hardware = {
167	.info = SNDRV_PCM_INFO_MMAP \| SNDRV_PCM_INFO_MMAP_VALID \|
168	SNDRV_PCM_INFO_INTERLEAVED \| SNDRV_PCM_INFO_BATCH,
b3c70c9e ML	169	.period_bytes_min = 1024,
	170	.period_bytes_max = 16 * 1024 - 1,
	171	.periods_min = 4,
	172	.periods_max = 255,
	173	.buffer_bytes_max = 128 * 1024,
	174	.fifo_size = 16,
	175	};
	176
	177	static inline struct alchemy_pcm_ctx ss_to_ctx(struct snd_pcm_substream ss)
	178	{
	179	struct snd_soc_pcm_runtime *rtd = ss->private_data;
781a9fcc KM	180	struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
781a9fcc KM	181	return snd_soc_component_get_drvdata(component);
b3c70c9e ML	182	}
	183
	184	static inline struct audio_stream ss_to_as(struct snd_pcm_substream ss)
	185	{
	186	struct alchemy_pcm_ctx *ctx = ss_to_ctx(ss);
	187	return &(ctx->stream[ss->stream]);
	188	}
	189
	190	static int alchemy_pcm_open(struct snd_pcm_substream *substream)
	191	{
	192	struct alchemy_pcm_ctx *ctx = ss_to_ctx(substream);
	193	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	194	int *dmaids, s = substream->stream;
	195	char *name;
	196
	197	dmaids = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	198	if (!dmaids)
	199	return -ENODEV; /* whoa, has ordering changed? */
	200
	201	/* DMA setup */
	202	name = (s == SNDRV_PCM_STREAM_PLAYBACK) ? "audio-tx" : "audio-rx";
	203	ctx->stream[s].dma = request_au1000_dma(dmaids[s], name,
88e24c3a	204	au1000_dma_interrupt, 0,
b3c70c9e ML	205	&ctx->stream[s]);
	206	set_dma_mode(ctx->stream[s].dma,
	207	get_dma_mode(ctx->stream[s].dma) & ~DMA_NC);
	208
	209	ctx->stream[s].substream = substream;
	210	ctx->stream[s].buffer = NULL;
	211	snd_soc_set_runtime_hwparams(substream, &alchemy_pcm_hardware);
	212
	213	return 0;
	214	}
	215
	216	static int alchemy_pcm_close(struct snd_pcm_substream *substream)
	217	{
	218	struct alchemy_pcm_ctx *ctx = ss_to_ctx(substream);
	219	int stype = substream->stream;
	220
	221	ctx->stream[stype].substream = NULL;
	222	free_au1000_dma(ctx->stream[stype].dma);
	223
	224	return 0;
	225	}
	226
	227	static int alchemy_pcm_hw_params(struct snd_pcm_substream *substream,
	228	struct snd_pcm_hw_params *hw_params)
	229	{
	230	struct audio_stream *stream = ss_to_as(substream);
	231	int err;
	232
	233	err = snd_pcm_lib_malloc_pages(substream,
	234	params_buffer_bytes(hw_params));
	235	if (err < 0)
	236	return err;
	237	err = au1000_setup_dma_link(stream,
	238	params_period_bytes(hw_params),
	239	params_periods(hw_params));
	240	if (err)
	241	snd_pcm_lib_free_pages(substream);
	242
	243	return err;
	244	}
	245
	246	static int alchemy_pcm_hw_free(struct snd_pcm_substream *substream)
	247	{
	248	struct audio_stream *stream = ss_to_as(substream);
	249	au1000_release_dma_link(stream);
	250	return snd_pcm_lib_free_pages(substream);
	251	}
	252
	253	static int alchemy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	254	{
	255	struct audio_stream *stream = ss_to_as(substream);
	256	int err = 0;
	257
	258	switch (cmd) {
	259	case SNDRV_PCM_TRIGGER_START:
	260	au1000_dma_start(stream);
	261	break;
	262	case SNDRV_PCM_TRIGGER_STOP:
	263	au1000_dma_stop(stream);
	264	break;
	265	default:
	266	err = -EINVAL;
	267	break;
	268	}
269	return err;
270	}
271
272	static snd_pcm_uframes_t alchemy_pcm_pointer(struct snd_pcm_substream *ss)
273	{
274	struct audio_stream *stream = ss_to_as(ss);
275	long location;
276
277	location = get_dma_residue(stream->dma);
278	location = stream->buffer->relative_end - location;
279	if (location == -1)
280	location = 0;
281	return bytes_to_frames(ss->runtime, location);
282	}
283
e731a870	284	static const struct snd_pcm_ops alchemy_pcm_ops = {
b3c70c9e ML	285	.open = alchemy_pcm_open,
	286	.close = alchemy_pcm_close,
	287	.ioctl = snd_pcm_lib_ioctl,
	288	.hw_params = alchemy_pcm_hw_params,
	289	.hw_free = alchemy_pcm_hw_free,
	290	.trigger = alchemy_pcm_trigger,
	291	.pointer = alchemy_pcm_pointer,
	292	};
	293
b3c70c9e ML	294	static int alchemy_pcm_new(struct snd_soc_pcm_runtime *rtd)
	295	{
	296	struct snd_pcm *pcm = rtd->pcm;
	297
	298	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
	299	snd_dma_continuous_data(GFP_KERNEL), 65536, (4096 * 1024) - 1);
	300
	301	return 0;
	302	}
	303
781a9fcc KM	304	static struct snd_soc_component_driver alchemy_pcm_soc_component = {
781a9fcc KM	305	.name = DRV_NAME,
b3c70c9e ML	306	.ops = &alchemy_pcm_ops,
b3c70c9e ML	307	.pcm_new = alchemy_pcm_new,
b3c70c9e ML	308	};
b3c70c9e ML	309
5c658be0	310	static int alchemy_pcm_drvprobe(struct platform_device *pdev)
b3c70c9e ML	311	{
b3c70c9e ML	312	struct alchemy_pcm_ctx *ctx;
b3c70c9e	313
46c3a02c	314	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
b3c70c9e ML	315	if (!ctx)
	316	return -ENOMEM;
	317
	318	platform_set_drvdata(pdev, ctx);
	319
781a9fcc KM	320	return devm_snd_soc_register_component(&pdev->dev,
781a9fcc KM	321	&alchemy_pcm_soc_component, NULL, 0);
b3c70c9e ML	322	}
	323
	324	static struct platform_driver alchemy_pcmdma_driver = {
	325	.driver = {
	326	.name = "alchemy-pcm-dma",
b3c70c9e ML	327	},
b3c70c9e ML	328	.probe = alchemy_pcm_drvprobe,
b3c70c9e ML	329	};
b3c70c9e ML	330
8a124f9c	331	module_platform_driver(alchemy_pcmdma_driver);
b3c70c9e ML	332
	333	MODULE_LICENSE("GPL");
	334	MODULE_DESCRIPTION("Au1000/Au1500/Au1100 Audio DMA driver");
	335	MODULE_AUTHOR("Manuel Lauss");