/* * imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer * * Copyright 2009 Sascha Hauer * * This code is based on code copyrighted by Freescale, * Liam Girdwood, Javier Martin and probably others. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include #include #include #include #include #include #include #include #include "imx-pcm.h" static bool filter(struct dma_chan *chan, void *param) { if (!imx_dma_is_general_purpose(chan)) return false; chan->private = param; return true; } static const struct snd_pcm_hardware imx_pcm_hardware = { .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME, .buffer_bytes_max = IMX_DEFAULT_DMABUF_SIZE, .period_bytes_min = 128, .period_bytes_max = 65535, /* Limited by SDMA engine */ .periods_min = 2, .periods_max = 255, .fifo_size = 0, }; static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = { .pcm_hardware = &imx_pcm_hardware, .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, .compat_filter_fn = filter, .prealloc_buffer_size = IMX_DEFAULT_DMABUF_SIZE, }; int imx_pcm_dma_init(struct platform_device *pdev, size_t size) { struct snd_dmaengine_pcm_config *config; struct snd_pcm_hardware *pcm_hardware; config = devm_kzalloc(&pdev->dev, sizeof(struct snd_dmaengine_pcm_config), GFP_KERNEL); if (!config) return -ENOMEM; *config = imx_dmaengine_pcm_config; if (size) config->prealloc_buffer_size = size; pcm_hardware = devm_kzalloc(&pdev->dev, sizeof(struct snd_pcm_hardware), GFP_KERNEL); *pcm_hardware = imx_pcm_hardware; if (size) pcm_hardware->buffer_bytes_max = size; config->pcm_hardware = pcm_hardware; return devm_snd_dmaengine_pcm_register(&pdev->dev, config, SND_DMAENGINE_PCM_FLAG_COMPAT); } EXPORT_SYMBOL_GPL(imx_pcm_dma_init); MODULE_LICENSE("GPL"); ;id=316d4d78cf9b6795b83f97c45368748741df418c'>diff

path: root/tools/perf/Documentation/perf-script.txt

Age	Commit message (Expand)	Author	Files	Lines