360 lines
9.0 KiB
C
360 lines
9.0 KiB
C
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/*
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* Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
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*
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* Based on sound/soc/imx/imx-pcm-dma-mx2.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/dmaengine.h>
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#include <sound/core.h>
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#include <sound/initval.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 <mach/dma.h>
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#include "mxs-pcm.h"
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static struct snd_pcm_hardware snd_mxs_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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SNDRV_PCM_FMTBIT_S20_3LE |
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SNDRV_PCM_FMTBIT_S24_LE,
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.channels_min = 2,
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.channels_max = 2,
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.period_bytes_min = 32,
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.period_bytes_max = 8192,
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.periods_min = 1,
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.periods_max = 52,
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.buffer_bytes_max = 64 * 1024,
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.fifo_size = 32,
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};
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static void audio_dma_irq(void *data)
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{
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struct snd_pcm_substream *substream = (struct snd_pcm_substream *)data;
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
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iprtd->offset += iprtd->period_bytes;
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iprtd->offset %= iprtd->period_bytes * iprtd->periods;
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snd_pcm_period_elapsed(substream);
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}
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static bool filter(struct dma_chan *chan, void *param)
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{
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struct mxs_pcm_runtime_data *iprtd = param;
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struct mxs_pcm_dma_params *dma_params = iprtd->dma_params;
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if (!mxs_dma_is_apbx(chan))
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return false;
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if (chan->chan_id != dma_params->chan_num)
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return false;
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chan->private = &iprtd->dma_data;
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return true;
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}
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static int mxs_dma_alloc(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 snd_pcm_runtime *runtime = substream->runtime;
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struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
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dma_cap_mask_t mask;
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iprtd->dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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dma_cap_zero(mask);
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dma_cap_set(DMA_SLAVE, mask);
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iprtd->dma_data.chan_irq = iprtd->dma_params->chan_irq;
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iprtd->dma_chan = dma_request_channel(mask, filter, iprtd);
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if (!iprtd->dma_chan)
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return -EINVAL;
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return 0;
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}
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static int snd_mxs_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 mxs_pcm_runtime_data *iprtd = runtime->private_data;
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unsigned long dma_addr;
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struct dma_chan *chan;
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int ret;
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ret = mxs_dma_alloc(substream, params);
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if (ret)
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return ret;
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chan = iprtd->dma_chan;
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iprtd->size = params_buffer_bytes(params);
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iprtd->periods = params_periods(params);
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iprtd->period_bytes = params_period_bytes(params);
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iprtd->offset = 0;
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iprtd->period_time = HZ / (params_rate(params) /
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params_period_size(params));
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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dma_addr = runtime->dma_addr;
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iprtd->buf = substream->dma_buffer.area;
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iprtd->desc = chan->device->device_prep_dma_cyclic(chan, dma_addr,
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iprtd->period_bytes * iprtd->periods,
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iprtd->period_bytes,
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substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
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DMA_TO_DEVICE : DMA_FROM_DEVICE);
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if (!iprtd->desc) {
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dev_err(&chan->dev->device, "cannot prepare slave dma\n");
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return -EINVAL;
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}
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iprtd->desc->callback = audio_dma_irq;
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iprtd->desc->callback_param = substream;
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return 0;
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}
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static int snd_mxs_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
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if (iprtd->dma_chan) {
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dma_release_channel(iprtd->dma_chan);
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iprtd->dma_chan = NULL;
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}
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return 0;
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}
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static int snd_mxs_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
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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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dmaengine_submit(iprtd->desc);
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break;
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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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dmaengine_terminate_all(iprtd->dma_chan);
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break;
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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 snd_pcm_uframes_t snd_mxs_pcm_pointer(
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struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
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return bytes_to_frames(substream->runtime, iprtd->offset);
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}
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static int snd_mxs_open(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct mxs_pcm_runtime_data *iprtd;
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int ret;
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iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
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if (iprtd == NULL)
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return -ENOMEM;
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runtime->private_data = iprtd;
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ret = snd_pcm_hw_constraint_integer(substream->runtime,
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SNDRV_PCM_HW_PARAM_PERIODS);
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if (ret < 0) {
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kfree(iprtd);
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return ret;
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}
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snd_soc_set_runtime_hwparams(substream, &snd_mxs_hardware);
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return 0;
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}
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static int snd_mxs_close(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
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kfree(iprtd);
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return 0;
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}
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static int snd_mxs_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 mxs_pcm_ops = {
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.open = snd_mxs_open,
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.close = snd_mxs_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = snd_mxs_pcm_hw_params,
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.hw_free = snd_mxs_pcm_hw_free,
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.trigger = snd_mxs_pcm_trigger,
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.pointer = snd_mxs_pcm_pointer,
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.mmap = snd_mxs_pcm_mmap,
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};
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static int mxs_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 = snd_mxs_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 u64 mxs_pcm_dmamask = DMA_BIT_MASK(32);
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static int mxs_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 = &mxs_pcm_dmamask;
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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 = mxs_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 = mxs_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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return ret;
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}
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static void mxs_pcm_free(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 struct snd_soc_platform_driver mxs_soc_platform = {
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.ops = &mxs_pcm_ops,
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.pcm_new = mxs_pcm_new,
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.pcm_free = mxs_pcm_free,
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};
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static int __devinit mxs_soc_platform_probe(struct platform_device *pdev)
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{
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return snd_soc_register_platform(&pdev->dev, &mxs_soc_platform);
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}
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static int __devexit mxs_soc_platform_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 mxs_pcm_driver = {
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.driver = {
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.name = "mxs-pcm-audio",
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.owner = THIS_MODULE,
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},
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.probe = mxs_soc_platform_probe,
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.remove = __devexit_p(mxs_soc_platform_remove),
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};
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static int __init snd_mxs_pcm_init(void)
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{
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return platform_driver_register(&mxs_pcm_driver);
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}
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module_init(snd_mxs_pcm_init);
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static void __exit snd_mxs_pcm_exit(void)
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{
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platform_driver_unregister(&mxs_pcm_driver);
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}
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module_exit(snd_mxs_pcm_exit);
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