| /* |
| * imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer |
| * |
| * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de> |
| * |
| * This code is based on code copyrighted by Freescale, |
| * Liam Girdwood, Javier Martin and probably others. |
| * |
| * 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. |
| */ |
| #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 <linux/types.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 "imx-pcm.h" |
| |
| static bool filter(struct dma_chan *chan, void *param) |
| { |
| struct snd_dmaengine_dai_dma_data *dma_data = param; |
| |
| if (!imx_dma_is_general_purpose(chan)) |
| return false; |
| |
| chan->private = dma_data->filter_data; |
| |
| return true; |
| } |
| |
| static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *params) |
| { |
| struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream); |
| struct dma_slave_config slave_config; |
| int ret; |
| |
| ret = snd_hwparams_to_dma_slave_config(substream, params, &slave_config); |
| if (ret) |
| return ret; |
| |
| snd_dmaengine_pcm_set_config_from_dai_data(substream, |
| snd_soc_dai_get_dma_data(rtd->cpu_dai, substream), |
| &slave_config); |
| |
| ret = dmaengine_slave_config(chan, &slave_config); |
| if (ret) |
| return ret; |
| |
| snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); |
| |
| return 0; |
| } |
| |
| static struct snd_pcm_hardware snd_imx_hardware = { |
| .info = SNDRV_PCM_INFO_INTERLEAVED | |
| SNDRV_PCM_INFO_BLOCK_TRANSFER | |
| SNDRV_PCM_INFO_MMAP | |
| SNDRV_PCM_INFO_MMAP_VALID | |
| SNDRV_PCM_INFO_PAUSE | |
| SNDRV_PCM_INFO_RESUME, |
| .formats = SNDRV_PCM_FMTBIT_S16_LE, |
| .rate_min = 8000, |
| .channels_min = 2, |
| .channels_max = 2, |
| .buffer_bytes_max = IMX_SSI_DMABUF_SIZE, |
| .period_bytes_min = 128, |
| .period_bytes_max = 65535, /* Limited by SDMA engine */ |
| .periods_min = 2, |
| .periods_max = 255, |
| .fifo_size = 0, |
| }; |
| |
| static int snd_imx_open(struct snd_pcm_substream *substream) |
| { |
| struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| |
| snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); |
| |
| return snd_dmaengine_pcm_open(substream, filter, |
| snd_soc_dai_get_dma_data(rtd->cpu_dai, substream)); |
| } |
| |
| static struct snd_pcm_ops imx_pcm_ops = { |
| .open = snd_imx_open, |
| .close = snd_dmaengine_pcm_close, |
| .ioctl = snd_pcm_lib_ioctl, |
| .hw_params = snd_imx_pcm_hw_params, |
| .trigger = snd_dmaengine_pcm_trigger, |
| .pointer = snd_dmaengine_pcm_pointer_no_residue, |
| .mmap = snd_imx_pcm_mmap, |
| }; |
| |
| static struct snd_soc_platform_driver imx_soc_platform_mx2 = { |
| .ops = &imx_pcm_ops, |
| .pcm_new = imx_pcm_new, |
| .pcm_free = imx_pcm_free, |
| }; |
| |
| int imx_pcm_dma_init(struct platform_device *pdev) |
| { |
| return snd_soc_register_platform(&pdev->dev, &imx_soc_platform_mx2); |
| } |