1 /* 2 * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved. 3 * 4 * Based on sound/soc/imx/imx-pcm-dma-mx2.c 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License along 17 * with this program; if not, write to the Free Software Foundation, Inc., 18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 19 */ 20 21 #include <linux/device.h> 22 #include <linux/init.h> 23 #include <linux/module.h> 24 25 #include <sound/core.h> 26 #include <sound/pcm.h> 27 #include <sound/soc.h> 28 #include <sound/dmaengine_pcm.h> 29 30 #include "mxs-pcm.h" 31 32 static const struct snd_pcm_hardware snd_mxs_hardware = { 33 .info = SNDRV_PCM_INFO_MMAP | 34 SNDRV_PCM_INFO_MMAP_VALID | 35 SNDRV_PCM_INFO_PAUSE | 36 SNDRV_PCM_INFO_RESUME | 37 SNDRV_PCM_INFO_INTERLEAVED | 38 SNDRV_PCM_INFO_HALF_DUPLEX, 39 .formats = SNDRV_PCM_FMTBIT_S16_LE | 40 SNDRV_PCM_FMTBIT_S20_3LE | 41 SNDRV_PCM_FMTBIT_S24_LE, 42 .channels_min = 2, 43 .channels_max = 2, 44 .period_bytes_min = 32, 45 .period_bytes_max = 8192, 46 .periods_min = 1, 47 .periods_max = 52, 48 .buffer_bytes_max = 64 * 1024, 49 .fifo_size = 32, 50 }; 51 52 static bool filter(struct dma_chan *chan, void *param) 53 { 54 struct mxs_pcm_dma_params *dma_params = param; 55 56 if (!mxs_dma_is_apbx(chan)) 57 return false; 58 59 if (chan->chan_id != dma_params->chan_num) 60 return false; 61 62 chan->private = &dma_params->dma_data; 63 64 return true; 65 } 66 67 static const struct snd_dmaengine_pcm_config mxs_dmaengine_pcm_config = { 68 .pcm_hardware = &snd_mxs_hardware, 69 .compat_filter_fn = filter, 70 .prealloc_buffer_size = 64 * 1024, 71 }; 72 73 int mxs_pcm_platform_register(struct device *dev) 74 { 75 return snd_dmaengine_pcm_register(dev, &mxs_dmaengine_pcm_config, 76 SND_DMAENGINE_PCM_FLAG_NO_RESIDUE | 77 SND_DMAENGINE_PCM_FLAG_NO_DT | 78 SND_DMAENGINE_PCM_FLAG_COMPAT | 79 SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX); 80 } 81 EXPORT_SYMBOL_GPL(mxs_pcm_platform_register); 82 83 void mxs_pcm_platform_unregister(struct device *dev) 84 { 85 snd_dmaengine_pcm_unregister(dev); 86 } 87 EXPORT_SYMBOL_GPL(mxs_pcm_platform_unregister); 88 89 MODULE_LICENSE("GPL"); 90