1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/sound/arm/ep93xx-pcm.c - EP93xx ALSA PCM interface 4 * 5 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org> 6 * Copyright (C) 2006 Applied Data Systems 7 * 8 * Rewritten for the SoC audio subsystem (Based on PXA2xx code): 9 * Copyright (c) 2008 Ryan Mallon 10 */ 11 12 #include <linux/module.h> 13 #include <linux/init.h> 14 #include <linux/platform_device.h> 15 #include <linux/dmaengine.h> 16 17 #include <sound/pcm.h> 18 #include <sound/soc.h> 19 #include <sound/dmaengine_pcm.h> 20 21 #include <linux/platform_data/dma-ep93xx.h> 22 23 #include "ep93xx-pcm.h" 24 25 static const struct snd_pcm_hardware ep93xx_pcm_hardware = { 26 .info = (SNDRV_PCM_INFO_MMAP | 27 SNDRV_PCM_INFO_MMAP_VALID | 28 SNDRV_PCM_INFO_INTERLEAVED | 29 SNDRV_PCM_INFO_BLOCK_TRANSFER), 30 .buffer_bytes_max = 131072, 31 .period_bytes_min = 32, 32 .period_bytes_max = 32768, 33 .periods_min = 1, 34 .periods_max = 32, 35 .fifo_size = 32, 36 }; 37 38 static bool ep93xx_pcm_dma_filter(struct dma_chan *chan, void *filter_param) 39 { 40 struct ep93xx_dma_data *data = filter_param; 41 42 if (data->direction == ep93xx_dma_chan_direction(chan)) { 43 chan->private = data; 44 return true; 45 } 46 47 return false; 48 } 49 50 static const struct snd_dmaengine_pcm_config ep93xx_dmaengine_pcm_config = { 51 .pcm_hardware = &ep93xx_pcm_hardware, 52 .compat_filter_fn = ep93xx_pcm_dma_filter, 53 .prealloc_buffer_size = 131072, 54 }; 55 56 int devm_ep93xx_pcm_platform_register(struct device *dev) 57 { 58 return devm_snd_dmaengine_pcm_register(dev, 59 &ep93xx_dmaengine_pcm_config, 60 SND_DMAENGINE_PCM_FLAG_NO_DT | 61 SND_DMAENGINE_PCM_FLAG_COMPAT); 62 } 63 EXPORT_SYMBOL_GPL(devm_ep93xx_pcm_platform_register); 64 65 MODULE_AUTHOR("Ryan Mallon"); 66 MODULE_DESCRIPTION("EP93xx ALSA PCM interface"); 67 MODULE_LICENSE("GPL"); 68