1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ALSA PCM interface for ST SPEAr Processors 4 * 5 * sound/soc/spear/spear_pcm.c 6 * 7 * Copyright (C) 2012 ST Microelectronics 8 * Rajeev Kumar<rajeevkumar.linux@gmail.com> 9 */ 10 11 #include <linux/module.h> 12 #include <linux/dmaengine.h> 13 #include <linux/platform_device.h> 14 #include <sound/dmaengine_pcm.h> 15 #include <sound/pcm.h> 16 #include <sound/soc.h> 17 #include <sound/spear_dma.h> 18 #include "spear_pcm.h" 19 20 static const struct snd_pcm_hardware spear_pcm_hardware = { 21 .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | 22 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | 23 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME), 24 .buffer_bytes_max = 16 * 1024, /* max buffer size */ 25 .period_bytes_min = 2 * 1024, /* 1 msec data minimum period size */ 26 .period_bytes_max = 2 * 1024, /* maximum period size */ 27 .periods_min = 1, /* min # periods */ 28 .periods_max = 8, /* max # of periods */ 29 .fifo_size = 0, /* fifo size in bytes */ 30 }; 31 32 static const struct snd_dmaengine_pcm_config spear_dmaengine_pcm_config = { 33 .pcm_hardware = &spear_pcm_hardware, 34 .prealloc_buffer_size = 16 * 1024, 35 }; 36 37 int devm_spear_pcm_platform_register(struct device *dev, 38 struct snd_dmaengine_pcm_config *config, 39 bool (*filter)(struct dma_chan *chan, void *slave)) 40 { 41 *config = spear_dmaengine_pcm_config; 42 config->compat_filter_fn = filter; 43 44 return devm_snd_dmaengine_pcm_register(dev, config, 45 SND_DMAENGINE_PCM_FLAG_NO_DT | 46 SND_DMAENGINE_PCM_FLAG_COMPAT); 47 } 48 EXPORT_SYMBOL_GPL(devm_spear_pcm_platform_register); 49 50 MODULE_AUTHOR("Rajeev Kumar <rajeevkumar.linux@gmail.com>"); 51 MODULE_DESCRIPTION("SPEAr PCM DMA module"); 52 MODULE_LICENSE("GPL"); 53