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 | config: &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 | |