1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com |
4 | * Author: Peter Ujfalusi <peter.ujfalusi@ti.com> |
5 | */ |
6 | |
7 | #include <linux/device.h> |
8 | #include <linux/module.h> |
9 | #include <sound/core.h> |
10 | #include <sound/pcm.h> |
11 | #include <sound/pcm_params.h> |
12 | #include <sound/soc.h> |
13 | #include <sound/dmaengine_pcm.h> |
14 | |
15 | #include "sdma-pcm.h" |
16 | |
17 | static const struct snd_pcm_hardware sdma_pcm_hardware = { |
18 | .info = SNDRV_PCM_INFO_MMAP | |
19 | SNDRV_PCM_INFO_MMAP_VALID | |
20 | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME | |
21 | SNDRV_PCM_INFO_NO_PERIOD_WAKEUP | |
22 | SNDRV_PCM_INFO_INTERLEAVED, |
23 | .period_bytes_min = 32, |
24 | .period_bytes_max = 64 * 1024, |
25 | .buffer_bytes_max = 128 * 1024, |
26 | .periods_min = 2, |
27 | .periods_max = 255, |
28 | }; |
29 | |
30 | static const struct snd_dmaengine_pcm_config sdma_dmaengine_pcm_config = { |
31 | .pcm_hardware = &sdma_pcm_hardware, |
32 | .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, |
33 | .prealloc_buffer_size = 128 * 1024, |
34 | }; |
35 | |
36 | int sdma_pcm_platform_register(struct device *dev, |
37 | char *txdmachan, char *rxdmachan) |
38 | { |
39 | struct snd_dmaengine_pcm_config *config; |
40 | unsigned int flags = 0; |
41 | |
42 | /* Standard names for the directions: 'tx' and 'rx' */ |
43 | if (!txdmachan && !rxdmachan) |
44 | return devm_snd_dmaengine_pcm_register(dev, |
45 | config: &sdma_dmaengine_pcm_config, flags: 0); |
46 | |
47 | config = devm_kzalloc(dev, size: sizeof(*config), GFP_KERNEL); |
48 | if (!config) |
49 | return -ENOMEM; |
50 | |
51 | *config = sdma_dmaengine_pcm_config; |
52 | |
53 | if (!txdmachan || !rxdmachan) { |
54 | /* One direction only PCM */ |
55 | flags |= SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX; |
56 | if (!txdmachan) { |
57 | txdmachan = rxdmachan; |
58 | rxdmachan = NULL; |
59 | } |
60 | } |
61 | |
62 | config->chan_names[0] = txdmachan; |
63 | config->chan_names[1] = rxdmachan; |
64 | |
65 | return devm_snd_dmaengine_pcm_register(dev, config, flags); |
66 | } |
67 | EXPORT_SYMBOL_GPL(sdma_pcm_platform_register); |
68 | |
69 | MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>" ); |
70 | MODULE_DESCRIPTION("sDMA PCM ASoC platform driver" ); |
71 | MODULE_LICENSE("GPL v2" ); |
72 | |