forked from Minki/linux
7c1c1d4a7b
Refactor the dmaengine PCM library to allow the DMA channel to be requested
before opening a PCM substream. snd_dmaengine_pcm_open() now expects a DMA
channel instead of a filter function and filter parameter as its parameters.
snd_dmaengine_pcm_close() is updated to not release the DMA channel. This allows
a dmaengine based PCM driver to request its channels before the substream is
opened.
The patch also introduces two new functions, snd_dmaengine_pcm_open_request_chan()
and snd_dmaengine_pcm_close_release_chan(), which have the same signature and
behaviour of the old snd_dmaengine_pcm_{open,close}() and internally use the new
variants of these functions. All users of snd_dmaengine_pcm_{open,close}() are
updated to use snd_dmaengine_pcm_open_request_chan() and
snd_dmaengine_pcm_close_release_chan().
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
255 lines
6.6 KiB
C
255 lines
6.6 KiB
C
/*
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* tegra_pcm.c - Tegra PCM driver
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*
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* Author: Stephen Warren <swarren@nvidia.com>
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* Copyright (C) 2010,2012 - NVIDIA, Inc.
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*
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* Based on code copyright/by:
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*
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* Copyright (c) 2009-2010, NVIDIA Corporation.
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* Scott Peterson <speterson@nvidia.com>
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* Vijay Mali <vmali@nvidia.com>
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*
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* Copyright (C) 2010 Google, Inc.
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* Iliyan Malchev <malchev@google.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/module.h>
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#include <linux/slab.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/soc.h>
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#include <sound/dmaengine_pcm.h>
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#include "tegra_pcm.h"
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static const struct snd_pcm_hardware tegra_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_PAUSE |
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SNDRV_PCM_INFO_RESUME |
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SNDRV_PCM_INFO_INTERLEAVED,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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.channels_min = 2,
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.channels_max = 2,
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.period_bytes_min = 1024,
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.period_bytes_max = PAGE_SIZE,
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.periods_min = 2,
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.periods_max = 8,
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.buffer_bytes_max = PAGE_SIZE * 8,
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.fifo_size = 4,
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};
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static int tegra_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 device *dev = rtd->platform->dev;
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int ret;
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/* Set HW params now that initialization is complete */
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snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);
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ret = snd_dmaengine_pcm_open_request_chan(substream, NULL, NULL);
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if (ret) {
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dev_err(dev, "dmaengine pcm open failed with err %d\n", ret);
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return ret;
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}
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return 0;
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}
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static int tegra_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_soc_pcm_runtime *rtd = substream->private_data;
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struct device *dev = rtd->platform->dev;
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struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
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struct dma_slave_config slave_config;
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int ret;
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ret = snd_hwparams_to_dma_slave_config(substream, params,
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&slave_config);
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if (ret) {
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dev_err(dev, "hw params config failed with err %d\n", ret);
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return ret;
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}
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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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&slave_config);
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ret = dmaengine_slave_config(chan, &slave_config);
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if (ret < 0) {
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dev_err(dev, "dma slave config failed with err %d\n", ret);
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return ret;
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}
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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return 0;
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}
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static int tegra_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 int tegra_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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return snd_dmaengine_pcm_trigger(substream,
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SNDRV_PCM_TRIGGER_START);
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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return snd_dmaengine_pcm_trigger(substream,
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SNDRV_PCM_TRIGGER_STOP);
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int tegra_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 tegra_pcm_ops = {
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.open = tegra_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 = tegra_pcm_hw_params,
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.hw_free = tegra_pcm_hw_free,
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.trigger = tegra_pcm_trigger,
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.pointer = snd_dmaengine_pcm_pointer,
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.mmap = tegra_pcm_mmap,
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};
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static int tegra_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, 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 = tegra_pcm_hardware.buffer_bytes_max;
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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->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->bytes = size;
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return 0;
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}
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static void tegra_pcm_deallocate_dma_buffer(struct snd_pcm *pcm, int stream)
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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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substream = pcm->streams[stream].substream;
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if (!substream)
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return;
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buf = &substream->dma_buffer;
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if (!buf->area)
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return;
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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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static u64 tegra_dma_mask = DMA_BIT_MASK(32);
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static int tegra_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 = 0;
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if (!card->dev->dma_mask)
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card->dev->dma_mask = &tegra_dma_mask;
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if (!card->dev->coherent_dma_mask)
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card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
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if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
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ret = tegra_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_PLAYBACK);
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if (ret)
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goto err;
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}
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if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
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ret = tegra_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_CAPTURE);
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if (ret)
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goto err_free_play;
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}
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return 0;
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err_free_play:
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tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
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err:
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return ret;
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}
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static void tegra_pcm_free(struct snd_pcm *pcm)
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{
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tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE);
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tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
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}
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static struct snd_soc_platform_driver tegra_pcm_platform = {
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.ops = &tegra_pcm_ops,
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.pcm_new = tegra_pcm_new,
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.pcm_free = tegra_pcm_free,
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};
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int tegra_pcm_platform_register(struct device *dev)
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{
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return snd_soc_register_platform(dev, &tegra_pcm_platform);
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}
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EXPORT_SYMBOL_GPL(tegra_pcm_platform_register);
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void tegra_pcm_platform_unregister(struct device *dev)
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{
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snd_soc_unregister_platform(dev);
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}
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EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister);
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MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
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MODULE_DESCRIPTION("Tegra PCM ASoC driver");
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MODULE_LICENSE("GPL");
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