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/clk.h> 15 #include <linux/delay.h> 16 #include <linux/device.h> 17 #include <linux/dma-mapping.h> 18 #include <linux/init.h> 19 #include <linux/interrupt.h> 20 #include <linux/module.h> 21 #include <linux/platform_device.h> 22 #include <linux/slab.h> 23 #include <linux/dmaengine.h> 24 #include <linux/types.h> 25 26 #include <sound/core.h> 27 #include <sound/initval.h> 28 #include <sound/pcm.h> 29 #include <sound/pcm_params.h> 30 #include <sound/soc.h> 31 #include <sound/dmaengine_pcm.h> 32 33 #include "imx-pcm.h" 34 35 static bool filter(struct dma_chan *chan, void *param) 36 { 37 struct snd_dmaengine_dai_dma_data *dma_data = param; 38 39 if (!imx_dma_is_general_purpose(chan)) 40 return false; 41 42 chan->private = dma_data->filter_data; 43 44 return true; 45 } 46 47 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream, 48 struct snd_pcm_hw_params *params) 49 { 50 struct snd_soc_pcm_runtime *rtd = substream->private_data; 51 struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream); 52 struct dma_slave_config slave_config; 53 int ret; 54 55 ret = snd_hwparams_to_dma_slave_config(substream, params, &slave_config); 56 if (ret) 57 return ret; 58 59 snd_dmaengine_pcm_set_config_from_dai_data(substream, 60 snd_soc_dai_get_dma_data(rtd->cpu_dai, substream), 61 &slave_config); 62 63 ret = dmaengine_slave_config(chan, &slave_config); 64 if (ret) 65 return ret; 66 67 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); 68 69 return 0; 70 } 71 72 static struct snd_pcm_hardware snd_imx_hardware = { 73 .info = SNDRV_PCM_INFO_INTERLEAVED | 74 SNDRV_PCM_INFO_BLOCK_TRANSFER | 75 SNDRV_PCM_INFO_MMAP | 76 SNDRV_PCM_INFO_MMAP_VALID | 77 SNDRV_PCM_INFO_PAUSE | 78 SNDRV_PCM_INFO_RESUME, 79 .formats = SNDRV_PCM_FMTBIT_S16_LE, 80 .rate_min = 8000, 81 .channels_min = 2, 82 .channels_max = 2, 83 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE, 84 .period_bytes_min = 128, 85 .period_bytes_max = 65535, /* Limited by SDMA engine */ 86 .periods_min = 2, 87 .periods_max = 255, 88 .fifo_size = 0, 89 }; 90 91 static int snd_imx_open(struct snd_pcm_substream *substream) 92 { 93 struct snd_soc_pcm_runtime *rtd = substream->private_data; 94 95 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); 96 97 return snd_dmaengine_pcm_open(substream, filter, 98 snd_soc_dai_get_dma_data(rtd->cpu_dai, substream)); 99 } 100 101 static struct snd_pcm_ops imx_pcm_ops = { 102 .open = snd_imx_open, 103 .close = snd_dmaengine_pcm_close_release_chan, 104 .ioctl = snd_pcm_lib_ioctl, 105 .hw_params = snd_imx_pcm_hw_params, 106 .trigger = snd_dmaengine_pcm_trigger, 107 .pointer = snd_dmaengine_pcm_pointer_no_residue, 108 .mmap = snd_imx_pcm_mmap, 109 }; 110 111 static struct snd_soc_platform_driver imx_soc_platform_mx2 = { 112 .ops = &imx_pcm_ops, 113 .pcm_new = imx_pcm_new, 114 .pcm_free = imx_pcm_free, 115 }; 116 117 int imx_pcm_dma_init(struct platform_device *pdev) 118 { 119 return snd_soc_register_platform(&pdev->dev, &imx_soc_platform_mx2); 120 } 121