soc-generic-dmaengine-pcm.c 11.7 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
/*
 *  Copyright (C) 2013, Analog Devices Inc.
 *	Author: Lars-Peter Clausen <lars@metafoo.de>
 *
 *  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.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/dmaengine.h>
#include <linux/slab.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <linux/dma-mapping.h>
#include <linux/of.h>

#include <sound/dmaengine_pcm.h>

struct dmaengine_pcm {
28
	struct dma_chan *chan[SNDRV_PCM_STREAM_LAST + 1];
29 30
	const struct snd_dmaengine_pcm_config *config;
	struct snd_soc_platform platform;
31
	unsigned int flags;
32 33 34 35 36 37 38
};

static struct dmaengine_pcm *soc_platform_to_pcm(struct snd_soc_platform *p)
{
	return container_of(p, struct dmaengine_pcm, platform);
}

39 40 41 42 43 44 45 46 47
static struct device *dmaengine_dma_dev(struct dmaengine_pcm *pcm,
	struct snd_pcm_substream *substream)
{
	if (!pcm->chan[substream->stream])
		return NULL;

	return pcm->chan[substream->stream]->device->dev;
}

48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86
/**
 * snd_dmaengine_pcm_prepare_slave_config() - Generic prepare_slave_config callback
 * @substream: PCM substream
 * @params: hw_params
 * @slave_config: DMA slave config to prepare
 *
 * This function can be used as a generic prepare_slave_config callback for
 * platforms which make use of the snd_dmaengine_dai_dma_data struct for their
 * DAI DMA data. Internally the function will first call
 * snd_hwparams_to_dma_slave_config to fill in the slave config based on the
 * hw_params, followed by snd_dmaengine_set_config_from_dai_data to fill in the
 * remaining fields based on the DAI DMA data.
 */
int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_dmaengine_dai_dma_data *dma_data;
	int ret;

	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

	ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
	if (ret)
		return ret;

	snd_dmaengine_pcm_set_config_from_dai_data(substream, dma_data,
		slave_config);

	return 0;
}
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_prepare_slave_config);

static int dmaengine_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
	struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
87 88 89
	int (*prepare_slave_config)(struct snd_pcm_substream *substream,
			struct snd_pcm_hw_params *params,
			struct dma_slave_config *slave_config);
90 91 92
	struct dma_slave_config slave_config;
	int ret;

93 94
	memset(&slave_config, 0, sizeof(slave_config));

95 96 97 98 99 100 101
	if (!pcm->config)
		prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config;
	else
		prepare_slave_config = pcm->config->prepare_slave_config;

	if (prepare_slave_config) {
		ret = prepare_slave_config(substream, params, &slave_config);
102 103 104 105 106 107 108 109 110 111 112
		if (ret)
			return ret;

		ret = dmaengine_slave_config(chan, &slave_config);
		if (ret)
			return ret;
	}

	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
}

113
static int dmaengine_pcm_set_runtime_hwparams(struct snd_pcm_substream *substream)
114 115 116
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
117
	struct device *dma_dev = dmaengine_dma_dev(pcm, substream);
118
	struct dma_chan *chan = pcm->chan[substream->stream];
119 120 121
	struct snd_dmaengine_dai_dma_data *dma_data;
	struct dma_slave_caps dma_caps;
	struct snd_pcm_hardware hw;
122 123
	int ret;

124
	if (pcm->config && pcm->config->pcm_hardware)
125
		return snd_soc_set_runtime_hwparams(substream,
126 127
				pcm->config->pcm_hardware);

128 129 130 131 132 133 134 135 136 137 138 139
	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

	memset(&hw, 0, sizeof(hw));
	hw.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
			SNDRV_PCM_INFO_INTERLEAVED;
	hw.periods_min = 2;
	hw.periods_max = UINT_MAX;
	hw.period_bytes_min = 256;
	hw.period_bytes_max = dma_get_max_seg_size(dma_dev);
	hw.buffer_bytes_max = SIZE_MAX;
	hw.fifo_size = dma_data->fifo_size;

140 141 142
	if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
		hw.info |= SNDRV_PCM_INFO_BATCH;

143 144 145 146 147 148 149
	ret = dma_get_slave_caps(chan, &dma_caps);
	if (ret == 0) {
		if (dma_caps.cmd_pause)
			hw.info |= SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME;
	}

	return snd_soc_set_runtime_hwparams(substream, &hw);
150 151
}

152
static int dmaengine_pcm_open(struct snd_pcm_substream *substream)
153
{
154 155 156 157
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
	struct dma_chan *chan = pcm->chan[substream->stream];
	int ret;
158

159 160 161 162 163
	ret = dmaengine_pcm_set_runtime_hwparams(substream);
	if (ret)
		return ret;

	return snd_dmaengine_pcm_open(substream, chan);
164 165 166 167 168 169 170
}

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

171 172 173 174 175
static struct dma_chan *dmaengine_pcm_compat_request_channel(
	struct snd_soc_pcm_runtime *rtd,
	struct snd_pcm_substream *substream)
{
	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
176 177 178
	struct snd_dmaengine_dai_dma_data *dma_data;

	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
179

180 181 182
	if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0])
		return pcm->chan[0];

183 184 185 186
	if (pcm->config->compat_request_channel)
		return pcm->config->compat_request_channel(rtd, substream);

	return snd_dmaengine_pcm_request_channel(pcm->config->compat_filter_fn,
187
						 dma_data->filter_data);
188 189
}

190 191 192 193
static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
	const struct snd_dmaengine_pcm_config *config = pcm->config;
194 195
	struct device *dev = rtd->platform->dev;
	struct snd_dmaengine_dai_dma_data *dma_data;
196
	struct snd_pcm_substream *substream;
197 198
	size_t prealloc_buffer_size;
	size_t max_buffer_size;
199 200 201
	unsigned int i;
	int ret;

202 203 204 205 206 207 208 209 210
	if (config && config->prealloc_buffer_size) {
		prealloc_buffer_size = config->prealloc_buffer_size;
		max_buffer_size = config->pcm_hardware->buffer_bytes_max;
	} else {
		prealloc_buffer_size = 512 * 1024;
		max_buffer_size = SIZE_MAX;
	}


211 212 213 214 215
	for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
		substream = rtd->pcm->streams[i].substream;
		if (!substream)
			continue;

216 217 218 219 220 221 222
		dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

		if (!pcm->chan[i] &&
		    (pcm->flags & SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME))
			pcm->chan[i] = dma_request_slave_channel(dev,
				dma_data->chan_name);

223
		if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_COMPAT)) {
224 225 226 227
			pcm->chan[i] = dmaengine_pcm_compat_request_channel(rtd,
				substream);
		}

228 229 230 231 232 233 234 235
		if (!pcm->chan[i]) {
			dev_err(rtd->platform->dev,
				"Missing dma channel for stream: %d\n", i);
			ret = -EINVAL;
			goto err_free;
		}

		ret = snd_pcm_lib_preallocate_pages(substream,
236
				SNDRV_DMA_TYPE_DEV_IRAM,
237
				dmaengine_dma_dev(pcm, substream),
238 239
				prealloc_buffer_size,
				max_buffer_size);
240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264
		if (ret)
			goto err_free;
	}

	return 0;

err_free:
	dmaengine_pcm_free(rtd->pcm);
	return ret;
}

static const struct snd_pcm_ops dmaengine_pcm_ops = {
	.open		= dmaengine_pcm_open,
	.close		= snd_dmaengine_pcm_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= dmaengine_pcm_hw_params,
	.hw_free	= snd_pcm_lib_free_pages,
	.trigger	= snd_dmaengine_pcm_trigger,
	.pointer	= snd_dmaengine_pcm_pointer,
};

static const struct snd_soc_platform_driver dmaengine_pcm_platform = {
	.ops		= &dmaengine_pcm_ops,
	.pcm_new	= dmaengine_pcm_new,
	.pcm_free	= dmaengine_pcm_free,
265
	.probe_order	= SND_SOC_COMP_ORDER_LATE,
266 267
};

268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284
static const struct snd_pcm_ops dmaengine_no_residue_pcm_ops = {
	.open		= dmaengine_pcm_open,
	.close		= snd_dmaengine_pcm_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= dmaengine_pcm_hw_params,
	.hw_free	= snd_pcm_lib_free_pages,
	.trigger	= snd_dmaengine_pcm_trigger,
	.pointer	= snd_dmaengine_pcm_pointer_no_residue,
};

static const struct snd_soc_platform_driver dmaengine_no_residue_pcm_platform = {
	.ops		= &dmaengine_no_residue_pcm_ops,
	.pcm_new	= dmaengine_pcm_new,
	.pcm_free	= dmaengine_pcm_free,
	.probe_order	= SND_SOC_COMP_ORDER_LATE,
};

285 286 287 288 289
static const char * const dmaengine_pcm_dma_channel_names[] = {
	[SNDRV_PCM_STREAM_PLAYBACK] = "tx",
	[SNDRV_PCM_STREAM_CAPTURE] = "rx",
};

290
static int dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
291
	struct device *dev, const struct snd_dmaengine_pcm_config *config)
292 293
{
	unsigned int i;
294
	const char *name;
295
	struct dma_chan *chan;
296

297 298 299
	if ((pcm->flags & (SND_DMAENGINE_PCM_FLAG_NO_DT |
			   SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME)) ||
	    !dev->of_node)
300
		return 0;
301

302 303 304 305 306 307 308 309 310 311 312 313
	if (config->dma_dev) {
		/*
		 * If this warning is seen, it probably means that your Linux
		 * device structure does not match your HW device structure.
		 * It would be best to refactor the Linux device structure to
		 * correctly match the HW structure.
		 */
		dev_warn(dev, "DMA channels sourced from device %s",
			 dev_name(config->dma_dev));
		dev = config->dma_dev;
	}

314 315 316 317 318 319
	for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE;
	     i++) {
		if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
			name = "rx-tx";
		else
			name = dmaengine_pcm_dma_channel_names[i];
320 321
		if (config->chan_names[i])
			name = config->chan_names[i];
322 323
		chan = dma_request_slave_channel_reason(dev, name);
		if (IS_ERR(chan)) {
324
			if (PTR_ERR(chan) == -EPROBE_DEFER)
325 326 327 328 329
				return -EPROBE_DEFER;
			pcm->chan[i] = NULL;
		} else {
			pcm->chan[i] = chan;
		}
330 331
		if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
			break;
332
	}
333 334 335

	if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
		pcm->chan[1] = pcm->chan[0];
336 337

	return 0;
338 339
}

340 341 342 343 344 345 346 347 348 349 350 351 352 353
static void dmaengine_pcm_release_chan(struct dmaengine_pcm *pcm)
{
	unsigned int i;

	for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE;
	     i++) {
		if (!pcm->chan[i])
			continue;
		dma_release_channel(pcm->chan[i]);
		if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
			break;
	}
}

354 355 356 357 358 359 360 361 362 363
/**
 * snd_dmaengine_pcm_register - Register a dmaengine based PCM device
 * @dev: The parent device for the PCM device
 * @config: Platform specific PCM configuration
 * @flags: Platform specific quirks
 */
int snd_dmaengine_pcm_register(struct device *dev,
	const struct snd_dmaengine_pcm_config *config, unsigned int flags)
{
	struct dmaengine_pcm *pcm;
364
	int ret;
365 366 367 368 369 370

	pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
	if (!pcm)
		return -ENOMEM;

	pcm->config = config;
371
	pcm->flags = flags;
372

373 374 375
	ret = dmaengine_pcm_request_chan_of(pcm, dev, config);
	if (ret)
		goto err_free_dma;
376

377
	if (flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
378
		ret = snd_soc_add_platform(dev, &pcm->platform,
379 380
				&dmaengine_no_residue_pcm_platform);
	else
381
		ret = snd_soc_add_platform(dev, &pcm->platform,
382
				&dmaengine_pcm_platform);
383 384 385 386 387 388 389 390 391
	if (ret)
		goto err_free_dma;

	return 0;

err_free_dma:
	dmaengine_pcm_release_chan(pcm);
	kfree(pcm);
	return ret;
392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413
}
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_register);

/**
 * snd_dmaengine_pcm_unregister - Removes a dmaengine based PCM device
 * @dev: Parent device the PCM was register with
 *
 * Removes a dmaengine based PCM device previously registered with
 * snd_dmaengine_pcm_register.
 */
void snd_dmaengine_pcm_unregister(struct device *dev)
{
	struct snd_soc_platform *platform;
	struct dmaengine_pcm *pcm;

	platform = snd_soc_lookup_platform(dev);
	if (!platform)
		return;

	pcm = soc_platform_to_pcm(platform);

	snd_soc_remove_platform(platform);
414
	dmaengine_pcm_release_chan(pcm);
415 416 417 418 419
	kfree(pcm);
}
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_unregister);

MODULE_LICENSE("GPL");