| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Copyright (C) 2018 Texas Instruments Incorporated - http://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 | #include <linux/omap-dmaengine.h> |
| 15 | |
| 16 | #include "sdma-pcm.h" |
| 17 | |
| 18 | static const struct snd_pcm_hardware sdma_pcm_hardware = { |
| 19 | .info = SNDRV_PCM_INFO_MMAP | |
| 20 | SNDRV_PCM_INFO_MMAP_VALID | |
| 21 | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME | |
| 22 | SNDRV_PCM_INFO_NO_PERIOD_WAKEUP | |
| 23 | SNDRV_PCM_INFO_INTERLEAVED, |
| 24 | .period_bytes_min = 32, |
| 25 | .period_bytes_max = 64 * 1024, |
| 26 | .buffer_bytes_max = 128 * 1024, |
| 27 | .periods_min = 2, |
| 28 | .periods_max = 255, |
| 29 | }; |
| 30 | |
| 31 | static const struct snd_dmaengine_pcm_config sdma_dmaengine_pcm_config = { |
| 32 | .pcm_hardware = &sdma_pcm_hardware, |
| 33 | .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, |
| 34 | .compat_filter_fn = omap_dma_filter_fn, |
| 35 | .prealloc_buffer_size = 128 * 1024, |
| 36 | }; |
| 37 | |
| 38 | int sdma_pcm_platform_register(struct device *dev, |
| 39 | char *txdmachan, char *rxdmachan) |
| 40 | { |
| 41 | struct snd_dmaengine_pcm_config *config; |
| 42 | unsigned int flags = SND_DMAENGINE_PCM_FLAG_COMPAT; |
| 43 | |
| 44 | /* Standard names for the directions: 'tx' and 'rx' */ |
| 45 | if (!txdmachan && !rxdmachan) |
| 46 | return devm_snd_dmaengine_pcm_register(dev, |
| 47 | &sdma_dmaengine_pcm_config, |
| 48 | flags); |
| 49 | |
| 50 | config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL); |
| 51 | if (!config) |
| 52 | return -ENOMEM; |
| 53 | |
| 54 | *config = sdma_dmaengine_pcm_config; |
| 55 | |
| 56 | if (!txdmachan || !rxdmachan) { |
| 57 | /* One direction only PCM */ |
| 58 | flags |= SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX; |
| 59 | if (!txdmachan) { |
| 60 | txdmachan = rxdmachan; |
| 61 | rxdmachan = NULL; |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | config->chan_names[0] = txdmachan; |
| 66 | config->chan_names[1] = rxdmachan; |
| 67 | |
| 68 | return devm_snd_dmaengine_pcm_register(dev, config, flags); |
| 69 | } |
| 70 | EXPORT_SYMBOL_GPL(sdma_pcm_platform_register); |
| 71 | |
| 72 | MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>"); |
| 73 | MODULE_DESCRIPTION("sDMA PCM ASoC platform driver"); |
| 74 | MODULE_LICENSE("GPL v2"); |