| | 1 | /* |
| | 2 | * imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer |
| | 3 | * |
| | 4 | * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de> |
| | 5 | * |
| | 6 | * This code is based on code copyrighted by Freescale, |
| | 7 | * Liam Girdwood, Javier Martin and probably others. |
| | 8 | * |
| | 9 | * This program is free software; you can redistribute it and/or modify it |
| | 10 | * under the terms of the GNU General Public License as published by the |
| | 11 | * Free Software Foundation; either version 2 of the License, or (at your |
| | 12 | * option) any later version. |
| | 13 | */ |
| | 14 | #include <linux/platform_device.h> |
| | 15 | #include <linux/dmaengine.h> |
| | 16 | #include <linux/types.h> |
| | 17 | |
| | 18 | #include <sound/core.h> |
| | 19 | #include <sound/pcm.h> |
| | 20 | #include <sound/soc.h> |
| | 21 | #include <sound/dmaengine_pcm.h> |
| | 22 | |
| | 23 | #include "imx-pcm.h" |
| | 24 | |
| | 25 | static bool filter(struct dma_chan *chan, void *param) |
| | 26 | { |
| | 27 | struct snd_dmaengine_dai_dma_data *dma_data = param; |
| | 28 | |
| | 29 | if (!imx_dma_is_general_purpose(chan)) |
| | 30 | return false; |
| | 31 | |
| | 32 | chan->private = dma_data->filter_data; |
| | 33 | |
| | 34 | return true; |
| | 35 | } |
| | 36 | |
| | 37 | static const struct snd_pcm_hardware imx_pcm_hardware = { |
| | 38 | .info = SNDRV_PCM_INFO_INTERLEAVED | |
| | 39 | SNDRV_PCM_INFO_BLOCK_TRANSFER | |
| | 40 | SNDRV_PCM_INFO_MMAP | |
| | 41 | SNDRV_PCM_INFO_MMAP_VALID | |
| | 42 | SNDRV_PCM_INFO_PAUSE | |
| | 43 | SNDRV_PCM_INFO_RESUME, |
| | 44 | .formats = SNDRV_PCM_FMTBIT_S16_LE, |
| | 45 | .rate_min = 8000, |
| | 46 | .channels_min = 2, |
| | 47 | .channels_max = 2, |
| | 48 | .buffer_bytes_max = IMX_SSI_DMABUF_SIZE, |
| | 49 | .period_bytes_min = 128, |
| | 50 | .period_bytes_max = 65535, /* Limited by SDMA engine */ |
| | 51 | .periods_min = 2, |
| | 52 | .periods_max = 255, |
| | 53 | .fifo_size = 0, |
| | 54 | }; |
| | 55 | |
| | 56 | static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = { |
| | 57 | .pcm_hardware = &imx_pcm_hardware, |
| | 58 | .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, |
| | 59 | .compat_filter_fn = filter, |
| | 60 | .prealloc_buffer_size = IMX_SSI_DMABUF_SIZE, |
| | 61 | }; |
| | 62 | |
| | 63 | int imx_pcm_dma_init(struct platform_device *pdev) |
| | 64 | { |
| | 65 | return snd_dmaengine_pcm_register(&pdev->dev, &imx_dmaengine_pcm_config, |
| | 66 | SND_DMAENGINE_PCM_FLAG_NO_RESIDUE | |
| | 67 | SND_DMAENGINE_PCM_FLAG_NO_DT | |
| | 68 | SND_DMAENGINE_PCM_FLAG_COMPAT); |
| | 69 | } |
| | 70 | EXPORT_SYMBOL_GPL(imx_pcm_dma_init); |
| | 71 | |
| | 72 | void imx_pcm_dma_exit(struct platform_device *pdev) |
| | 73 | { |
| | 74 | snd_dmaengine_pcm_unregister(&pdev->dev); |
| | 75 | } |
| | 76 | EXPORT_SYMBOL_GPL(imx_pcm_dma_exit); |
projects / linux-2.6-block.git / blame_incremental