| /* |
| * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved. |
| * |
| * Based on sound/soc/imx/imx-pcm-dma-mx2.c |
| * |
| * 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. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * 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., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| */ |
| |
| #include <linux/clk.h> |
| #include <linux/delay.h> |
| #include <linux/device.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/init.h> |
| #include <linux/interrupt.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/slab.h> |
| #include <linux/dmaengine.h> |
| |
| #include <sound/core.h> |
| #include <sound/initval.h> |
| #include <sound/pcm.h> |
| #include <sound/pcm_params.h> |
| #include <sound/soc.h> |
| #include <sound/dmaengine_pcm.h> |
| |
| #include "mxs-pcm.h" |
| |
| static struct snd_pcm_hardware snd_mxs_hardware = { |
| .info = SNDRV_PCM_INFO_MMAP | |
| SNDRV_PCM_INFO_MMAP_VALID | |
| SNDRV_PCM_INFO_PAUSE | |
| SNDRV_PCM_INFO_RESUME | |
| SNDRV_PCM_INFO_INTERLEAVED, |
| .formats = SNDRV_PCM_FMTBIT_S16_LE | |
| SNDRV_PCM_FMTBIT_S20_3LE | |
| SNDRV_PCM_FMTBIT_S24_LE, |
| .channels_min = 2, |
| .channels_max = 2, |
| .period_bytes_min = 32, |
| .period_bytes_max = 8192, |
| .periods_min = 1, |
| .periods_max = 52, |
| .buffer_bytes_max = 64 * 1024, |
| .fifo_size = 32, |
| |
| }; |
| |
| static bool filter(struct dma_chan *chan, void *param) |
| { |
| struct mxs_pcm_dma_params *dma_params = param; |
| |
| if (!mxs_dma_is_apbx(chan)) |
| return false; |
| |
| if (chan->chan_id != dma_params->chan_num) |
| return false; |
| |
| chan->private = &dma_params->dma_data; |
| |
| return true; |
| } |
| |
| static int snd_mxs_pcm_hw_params(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *params) |
| { |
| snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
| |
| return 0; |
| } |
| |
| static int snd_mxs_open(struct snd_pcm_substream *substream) |
| { |
| struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| |
| snd_soc_set_runtime_hwparams(substream, &snd_mxs_hardware); |
| |
| return snd_dmaengine_pcm_open(substream, filter, |
| snd_soc_dai_get_dma_data(rtd->cpu_dai, substream)); |
| } |
| |
| static int snd_mxs_pcm_mmap(struct snd_pcm_substream *substream, |
| struct vm_area_struct *vma) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| |
| return dma_mmap_writecombine(substream->pcm->card->dev, vma, |
| runtime->dma_area, |
| runtime->dma_addr, |
| runtime->dma_bytes); |
| } |
| |
| static struct snd_pcm_ops mxs_pcm_ops = { |
| .open = snd_mxs_open, |
| .close = snd_dmaengine_pcm_close, |
| .ioctl = snd_pcm_lib_ioctl, |
| .hw_params = snd_mxs_pcm_hw_params, |
| .trigger = snd_dmaengine_pcm_trigger, |
| .pointer = snd_dmaengine_pcm_pointer_no_residue, |
| .mmap = snd_mxs_pcm_mmap, |
| }; |
| |
| static int mxs_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) |
| { |
| struct snd_pcm_substream *substream = pcm->streams[stream].substream; |
| struct snd_dma_buffer *buf = &substream->dma_buffer; |
| size_t size = snd_mxs_hardware.buffer_bytes_max; |
| |
| buf->dev.type = SNDRV_DMA_TYPE_DEV; |
| buf->dev.dev = pcm->card->dev; |
| buf->private_data = NULL; |
| buf->area = dma_alloc_writecombine(pcm->card->dev, size, |
| &buf->addr, GFP_KERNEL); |
| if (!buf->area) |
| return -ENOMEM; |
| buf->bytes = size; |
| |
| return 0; |
| } |
| |
| static u64 mxs_pcm_dmamask = DMA_BIT_MASK(32); |
| static int mxs_pcm_new(struct snd_soc_pcm_runtime *rtd) |
| { |
| struct snd_card *card = rtd->card->snd_card; |
| struct snd_pcm *pcm = rtd->pcm; |
| int ret = 0; |
| |
| if (!card->dev->dma_mask) |
| card->dev->dma_mask = &mxs_pcm_dmamask; |
| if (!card->dev->coherent_dma_mask) |
| card->dev->coherent_dma_mask = DMA_BIT_MASK(32); |
| |
| if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { |
| ret = mxs_pcm_preallocate_dma_buffer(pcm, |
| SNDRV_PCM_STREAM_PLAYBACK); |
| if (ret) |
| goto out; |
| } |
| |
| if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { |
| ret = mxs_pcm_preallocate_dma_buffer(pcm, |
| SNDRV_PCM_STREAM_CAPTURE); |
| if (ret) |
| goto out; |
| } |
| |
| out: |
| return ret; |
| } |
| |
| static void mxs_pcm_free(struct snd_pcm *pcm) |
| { |
| struct snd_pcm_substream *substream; |
| struct snd_dma_buffer *buf; |
| int stream; |
| |
| for (stream = 0; stream < 2; stream++) { |
| substream = pcm->streams[stream].substream; |
| if (!substream) |
| continue; |
| |
| buf = &substream->dma_buffer; |
| if (!buf->area) |
| continue; |
| |
| dma_free_writecombine(pcm->card->dev, buf->bytes, |
| buf->area, buf->addr); |
| buf->area = NULL; |
| } |
| } |
| |
| static struct snd_soc_platform_driver mxs_soc_platform = { |
| .ops = &mxs_pcm_ops, |
| .pcm_new = mxs_pcm_new, |
| .pcm_free = mxs_pcm_free, |
| }; |
| |
| int mxs_pcm_platform_register(struct device *dev) |
| { |
| return snd_soc_register_platform(dev, &mxs_soc_platform); |
| } |
| EXPORT_SYMBOL_GPL(mxs_pcm_platform_register); |
| |
| void mxs_pcm_platform_unregister(struct device *dev) |
| { |
| snd_soc_unregister_platform(dev); |
| } |
| EXPORT_SYMBOL_GPL(mxs_pcm_platform_unregister); |
| |
| MODULE_LICENSE("GPL"); |