263 lines
6.7 KiB
C
263 lines
6.7 KiB
C
/*
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* omap-pcm.c -- ALSA PCM interface for the OMAP SoC
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*
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* Copyright (C) 2008 Nokia Corporation
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*
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* Contact: Jarkko Nikula <jarkko.nikula@bitmer.com>
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* Peter Ujfalusi <peter.ujfalusi@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include <linux/dma-mapping.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/omap-dma.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/dmaengine_pcm.h>
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#include <sound/soc.h>
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#ifdef CONFIG_ARCH_OMAP1
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#define pcm_omap1510() cpu_is_omap1510()
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#else
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#define pcm_omap1510() 0
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#endif
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static const struct snd_pcm_hardware omap_pcm_hardware = {
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.info = SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_PAUSE |
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SNDRV_PCM_INFO_RESUME |
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SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
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.period_bytes_min = 32,
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.period_bytes_max = 64 * 1024,
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.periods_min = 2,
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.periods_max = 255,
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.buffer_bytes_max = 128 * 1024,
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};
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/* this may get called several times by oss emulation */
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static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct omap_pcm_dma_data *dma_data;
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struct dma_slave_config config;
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struct dma_chan *chan;
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int err = 0;
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dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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/* return if this is a bufferless transfer e.g.
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* codec <--> BT codec or GSM modem -- lg FIXME */
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if (!dma_data)
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return 0;
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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runtime->dma_bytes = params_buffer_bytes(params);
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chan = snd_dmaengine_pcm_get_chan(substream);
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if (!chan)
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return -EINVAL;
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/* fills in addr_width and direction */
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err = snd_hwparams_to_dma_slave_config(substream, params, &config);
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if (err)
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return err;
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snd_dmaengine_pcm_set_config_from_dai_data(substream,
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snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
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&config);
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return dmaengine_slave_config(chan, &config);
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}
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static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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snd_pcm_set_runtime_buffer(substream, NULL);
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return 0;
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}
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static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
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{
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snd_pcm_uframes_t offset;
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if (pcm_omap1510())
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offset = snd_dmaengine_pcm_pointer_no_residue(substream);
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else
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offset = snd_dmaengine_pcm_pointer(substream);
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return offset;
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}
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static int omap_pcm_open(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_dmaengine_dai_dma_data *dma_data;
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int ret;
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snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
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dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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/* DT boot: filter_data is the DMA name */
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if (rtd->cpu_dai->dev->of_node) {
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struct dma_chan *chan;
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chan = dma_request_slave_channel(rtd->cpu_dai->dev,
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dma_data->filter_data);
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ret = snd_dmaengine_pcm_open(substream, chan);
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} else {
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ret = snd_dmaengine_pcm_open_request_chan(substream,
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omap_dma_filter_fn,
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dma_data->filter_data);
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}
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return ret;
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}
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static int omap_pcm_mmap(struct snd_pcm_substream *substream,
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struct vm_area_struct *vma)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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return dma_mmap_writecombine(substream->pcm->card->dev, vma,
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runtime->dma_area,
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runtime->dma_addr,
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runtime->dma_bytes);
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}
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static struct snd_pcm_ops omap_pcm_ops = {
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.open = omap_pcm_open,
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.close = snd_dmaengine_pcm_close_release_chan,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = omap_pcm_hw_params,
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.hw_free = omap_pcm_hw_free,
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.trigger = snd_dmaengine_pcm_trigger,
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.pointer = omap_pcm_pointer,
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.mmap = omap_pcm_mmap,
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};
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static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
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int stream)
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{
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struct snd_pcm_substream *substream = pcm->streams[stream].substream;
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struct snd_dma_buffer *buf = &substream->dma_buffer;
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size_t size = omap_pcm_hardware.buffer_bytes_max;
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buf->dev.type = SNDRV_DMA_TYPE_DEV;
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buf->dev.dev = pcm->card->dev;
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buf->private_data = NULL;
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buf->area = dma_alloc_writecombine(pcm->card->dev, size,
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&buf->addr, GFP_KERNEL);
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if (!buf->area)
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return -ENOMEM;
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buf->bytes = size;
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return 0;
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}
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static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
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{
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struct snd_pcm_substream *substream;
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struct snd_dma_buffer *buf;
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int stream;
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for (stream = 0; stream < 2; stream++) {
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substream = pcm->streams[stream].substream;
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if (!substream)
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continue;
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buf = &substream->dma_buffer;
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if (!buf->area)
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continue;
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dma_free_writecombine(pcm->card->dev, buf->bytes,
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buf->area, buf->addr);
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buf->area = NULL;
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}
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}
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static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
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{
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struct snd_card *card = rtd->card->snd_card;
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struct snd_pcm *pcm = rtd->pcm;
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int ret;
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ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(64));
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if (ret)
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return ret;
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if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
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ret = omap_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_PLAYBACK);
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if (ret)
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goto out;
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}
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if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
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ret = omap_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_CAPTURE);
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if (ret)
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goto out;
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}
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out:
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/* free preallocated buffers in case of error */
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if (ret)
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omap_pcm_free_dma_buffers(pcm);
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return ret;
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}
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static struct snd_soc_platform_driver omap_soc_platform = {
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.ops = &omap_pcm_ops,
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.pcm_new = omap_pcm_new,
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.pcm_free = omap_pcm_free_dma_buffers,
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};
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static int omap_pcm_probe(struct platform_device *pdev)
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{
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return snd_soc_register_platform(&pdev->dev,
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&omap_soc_platform);
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}
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static int omap_pcm_remove(struct platform_device *pdev)
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{
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snd_soc_unregister_platform(&pdev->dev);
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return 0;
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}
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static struct platform_driver omap_pcm_driver = {
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.driver = {
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.name = "omap-pcm-audio",
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.owner = THIS_MODULE,
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},
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.probe = omap_pcm_probe,
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.remove = omap_pcm_remove,
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};
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module_platform_driver(omap_pcm_driver);
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MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
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MODULE_DESCRIPTION("OMAP PCM DMA module");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:omap-pcm-audio");
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