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 if (!imx_dma_is_general_purpose(chan)) 38 return false; 39 40 chan->private = param; 41 42 return true; 43 } 44 45 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream, 46 struct snd_pcm_hw_params *params) 47 { 48 struct snd_soc_pcm_runtime *rtd = substream->private_data; 49 struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream); 50 struct imx_pcm_dma_params *dma_params; 51 struct dma_slave_config slave_config; 52 int ret; 53 54 dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); 55 56 ret = snd_hwparams_to_dma_slave_config(substream, params, &slave_config); 57 if (ret) 58 return ret; 59 60 slave_config.device_fc = false; 61 62 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 63 slave_config.dst_addr = dma_params->dma_addr; 64 slave_config.dst_maxburst = dma_params->burstsize; 65 } else { 66 slave_config.src_addr = dma_params->dma_addr; 67 slave_config.src_maxburst = dma_params->burstsize; 68 } 69 70 ret = dmaengine_slave_config(chan, &slave_config); 71 if (ret) 72 return ret; 73 74 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); 75 76 return 0; 77 } 78 79 static struct snd_pcm_hardware snd_imx_hardware = { 80 .info = SNDRV_PCM_INFO_INTERLEAVED | 81 SNDRV_PCM_INFO_BLOCK_TRANSFER | 82 SNDRV_PCM_INFO_MMAP | 83 SNDRV_PCM_INFO_MMAP_VALID | 84 SNDRV_PCM_INFO_PAUSE | 85 SNDRV_PCM_INFO_RESUME, 86 .formats = SNDRV_PCM_FMTBIT_S16_LE, 87 .rate_min = 8000, 88 .channels_min = 2, 89 .channels_max = 2, 90 .buffer_bytes_max = IMX_SSI_DMABUF_SIZE, 91 .period_bytes_min = 128, 92 .period_bytes_max = 65535, /* Limited by SDMA engine */ 93 .periods_min = 2, 94 .periods_max = 255, 95 .fifo_size = 0, 96 }; 97 98 static int snd_imx_open(struct snd_pcm_substream *substream) 99 { 100 struct snd_soc_pcm_runtime *rtd = substream->private_data; 101 struct imx_pcm_dma_params *dma_params; 102 103 snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware); 104 105 dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); 106 107 return snd_dmaengine_pcm_open(substream, filter, &dma_params->dma_data); 108 } 109 110 static struct snd_pcm_ops imx_pcm_ops = { 111 .open = snd_imx_open, 112 .close = snd_dmaengine_pcm_close, 113 .ioctl = snd_pcm_lib_ioctl, 114 .hw_params = snd_imx_pcm_hw_params, 115 .trigger = snd_dmaengine_pcm_trigger, 116 .pointer = snd_dmaengine_pcm_pointer_no_residue, 117 .mmap = snd_imx_pcm_mmap, 118 }; 119 120 static struct snd_soc_platform_driver imx_soc_platform_mx2 = { 121 .ops = &imx_pcm_ops, 122 .pcm_new = imx_pcm_new, 123 .pcm_free = imx_pcm_free, 124 }; 125 126 int imx_pcm_dma_init(struct platform_device *pdev) 127 { 128 return snd_soc_register_platform(&pdev->dev, &imx_soc_platform_mx2); 129 } 130