1/*
  2 * omap-pcm.c  --  ALSA PCM interface for the OMAP SoC
  3 *
  4 * Copyright (C) 2008 Nokia Corporation
  5 *
  6 * Contact: Jarkko Nikula <jarkko.nikula@bitmer.com>
  7 *          Peter Ujfalusi <peter.ujfalusi@ti.com>
  8 *
  9 * This program is free software; you can redistribute it and/or
 10 * modify it under the terms of the GNU General Public License
 11 * version 2 as published by the Free Software Foundation.
 12 *
 13 * This program is distributed in the hope that it will be useful, but
 14 * WITHOUT ANY WARRANTY; without even the implied warranty of
 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 16 * General Public License for more details.
 17 *
 18 * You should have received a copy of the GNU General Public License
 19 * along with this program; if not, write to the Free Software
 20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 21 * 02110-1301 USA
 22 *
 23 */
 24
 25#include <linux/dma-mapping.h>
 26#include <linux/slab.h>
 27#include <linux/module.h>
 28#include <linux/omap-dma.h>
 29#include <sound/core.h>
 30#include <sound/pcm.h>
 31#include <sound/pcm_params.h>
 32#include <sound/dmaengine_pcm.h>
 33#include <sound/soc.h>
 34#include <sound/omap-pcm.h>
 35
 36#ifdef CONFIG_ARCH_OMAP1
 37#define pcm_omap1510()	cpu_is_omap1510()
 38#else
 39#define pcm_omap1510()	0
 40#endif
 41
 42static struct snd_pcm_hardware omap_pcm_hardware = {
 43	.info			= SNDRV_PCM_INFO_MMAP |
 44				  SNDRV_PCM_INFO_MMAP_VALID |
 45				  SNDRV_PCM_INFO_INTERLEAVED |
 46				  SNDRV_PCM_INFO_PAUSE |
 47				  SNDRV_PCM_INFO_RESUME |
 48				  SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
 49	.period_bytes_min	= 32,
 50	.period_bytes_max	= 64 * 1024,
 51	.periods_min		= 2,
 52	.periods_max		= 255,
 53	.buffer_bytes_max	= 128 * 1024,
 54};
 55
 56/* sDMA supports only 1, 2, and 4 byte transfer elements. */
 57static void omap_pcm_limit_supported_formats(void)
 58{
 59	int i;
 60
 61	for (i = 0; i <= SNDRV_PCM_FORMAT_LAST; i++) {
 62		switch (snd_pcm_format_physical_width(i)) {
 63		case 8:
 64		case 16:
 65		case 32:
 66			omap_pcm_hardware.formats |= (1LL << i);
 67			break;
 68		default:
 69			break;
 70		}
 71	}
 72}
 73
 74/* this may get called several times by oss emulation */
 75static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
 76			      struct snd_pcm_hw_params *params)
 77{
 78	struct snd_pcm_runtime *runtime = substream->runtime;
 79	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 80	struct omap_pcm_dma_data *dma_data;
 81	struct dma_slave_config config;
 82	struct dma_chan *chan;
 83	int err = 0;
 84
 85	memset(&config, 0x00, sizeof(config));
 86
 87	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 88
 89	/* return if this is a bufferless transfer e.g.
 90	 * codec <--> BT codec or GSM modem -- lg FIXME */
 91	if (!dma_data)
 92		return 0;
 93
 94	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 95	runtime->dma_bytes = params_buffer_bytes(params);
 96
 97	chan = snd_dmaengine_pcm_get_chan(substream);
 98	if (!chan)
 99		return -EINVAL;
100
101	/* fills in addr_width and direction */
102	err = snd_hwparams_to_dma_slave_config(substream, params, &config);
103	if (err)
104		return err;
105
106	snd_dmaengine_pcm_set_config_from_dai_data(substream,
107			snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
108			&config);
109
110	return dmaengine_slave_config(chan, &config);
111}
112
113static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
114{
115	snd_pcm_set_runtime_buffer(substream, NULL);
116	return 0;
117}
118
119static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
120{
121	snd_pcm_uframes_t offset;
122
123	if (pcm_omap1510())
124		offset = snd_dmaengine_pcm_pointer_no_residue(substream);
125	else
126		offset = snd_dmaengine_pcm_pointer(substream);
127
128	return offset;
129}
130
131static int omap_pcm_open(struct snd_pcm_substream *substream)
132{
133	struct snd_soc_pcm_runtime *rtd = substream->private_data;
134	struct snd_dmaengine_dai_dma_data *dma_data;
135	int ret;
136
137	snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
138
139	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
140
141	/* DT boot: filter_data is the DMA name */
142	if (rtd->cpu_dai->dev->of_node) {
143		struct dma_chan *chan;
144
145		chan = dma_request_slave_channel(rtd->cpu_dai->dev,
146						 dma_data->filter_data);
147		ret = snd_dmaengine_pcm_open(substream, chan);
148	} else {
149		ret = snd_dmaengine_pcm_open_request_chan(substream,
150							  omap_dma_filter_fn,
151							  dma_data->filter_data);
152	}
153	return ret;
154}
155
156static int omap_pcm_mmap(struct snd_pcm_substream *substream,
157	struct vm_area_struct *vma)
158{
159	struct snd_pcm_runtime *runtime = substream->runtime;
160
161	return dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area,
162			   runtime->dma_addr, runtime->dma_bytes);
163}
164
165static const struct snd_pcm_ops omap_pcm_ops = {
166	.open		= omap_pcm_open,
167	.close		= snd_dmaengine_pcm_close_release_chan,
168	.ioctl		= snd_pcm_lib_ioctl,
169	.hw_params	= omap_pcm_hw_params,
170	.hw_free	= omap_pcm_hw_free,
171	.trigger	= snd_dmaengine_pcm_trigger,
172	.pointer	= omap_pcm_pointer,
173	.mmap		= omap_pcm_mmap,
174};
175
176static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
177	int stream)
178{
179	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
180	struct snd_dma_buffer *buf = &substream->dma_buffer;
181	size_t size = omap_pcm_hardware.buffer_bytes_max;
182
183	buf->dev.type = SNDRV_DMA_TYPE_DEV;
184	buf->dev.dev = pcm->card->dev;
185	buf->private_data = NULL;
186	buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL);
187	if (!buf->area)
188		return -ENOMEM;
189
190	buf->bytes = size;
191	return 0;
192}
193
194static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
195{
196	struct snd_pcm_substream *substream;
197	struct snd_dma_buffer *buf;
198	int stream;
199
200	for (stream = 0; stream < 2; stream++) {
201		substream = pcm->streams[stream].substream;
202		if (!substream)
203			continue;
204
205		buf = &substream->dma_buffer;
206		if (!buf->area)
207			continue;
208
209		dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr);
210		buf->area = NULL;
211	}
212}
213
214static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
215{
216	struct snd_card *card = rtd->card->snd_card;
217	struct snd_pcm *pcm = rtd->pcm;
218	int ret;
219
220	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
221	if (ret)
222		return ret;
223
224	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
225		ret = omap_pcm_preallocate_dma_buffer(pcm,
226			SNDRV_PCM_STREAM_PLAYBACK);
227		if (ret)
228			goto out;
229	}
230
231	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
232		ret = omap_pcm_preallocate_dma_buffer(pcm,
233			SNDRV_PCM_STREAM_CAPTURE);
234		if (ret)
235			goto out;
236	}
237
238out:
239	/* free preallocated buffers in case of error */
240	if (ret)
241		omap_pcm_free_dma_buffers(pcm);
242
243	return ret;
244}
245
246static const struct snd_soc_component_driver omap_soc_component = {
247	.ops		= &omap_pcm_ops,
248	.pcm_new	= omap_pcm_new,
249	.pcm_free	= omap_pcm_free_dma_buffers,
250};
251
252int omap_pcm_platform_register(struct device *dev)
253{
254	omap_pcm_limit_supported_formats();
255	return devm_snd_soc_register_component(dev, &omap_soc_component,
256					       NULL, 0);
257}
258EXPORT_SYMBOL_GPL(omap_pcm_platform_register);
259
260MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
261MODULE_DESCRIPTION("OMAP PCM DMA module");
262MODULE_LICENSE("GPL");