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Linux/sound/soc/atmel/atmel-pcm-dma.c

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  1 /*
  2  * atmel-pcm-dma.c  --  ALSA PCM DMA support for the Atmel SoC.
  3  *
  4  *  Copyright (C) 2012 Atmel
  5  *
  6  * Author: Bo Shen <voice.shen@atmel.com>
  7  *
  8  * Based on atmel-pcm by:
  9  * Sedji Gaouaou <sedji.gaouaou@atmel.com>
 10  * Copyright 2008 Atmel
 11  *
 12  * This program is free software; you can redistribute it and/or modify
 13  * it under the terms of the GNU General Public License as published by
 14  * the Free Software Foundation; either version 2 of the License, or
 15  * (at your option) any later version.
 16  *
 17  * This program is distributed in the hope that it will be useful,
 18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 20  * GNU General Public License for more details.
 21  *
 22  * You should have received a copy of the GNU General Public License
 23  * along with this program; if not, write to the Free Software
 24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 25  */
 26 
 27 #include <linux/module.h>
 28 #include <linux/init.h>
 29 #include <linux/platform_device.h>
 30 #include <linux/slab.h>
 31 #include <linux/dma-mapping.h>
 32 #include <linux/dmaengine.h>
 33 #include <linux/atmel-ssc.h>
 34 #include <linux/platform_data/dma-atmel.h>
 35 
 36 #include <sound/core.h>
 37 #include <sound/pcm.h>
 38 #include <sound/pcm_params.h>
 39 #include <sound/soc.h>
 40 #include <sound/dmaengine_pcm.h>
 41 
 42 #include "atmel-pcm.h"
 43 
 44 /*--------------------------------------------------------------------------*\
 45  * Hardware definition
 46 \*--------------------------------------------------------------------------*/
 47 static const struct snd_pcm_hardware atmel_pcm_dma_hardware = {
 48         .info                   = SNDRV_PCM_INFO_MMAP |
 49                                   SNDRV_PCM_INFO_MMAP_VALID |
 50                                   SNDRV_PCM_INFO_INTERLEAVED |
 51                                   SNDRV_PCM_INFO_RESUME |
 52                                   SNDRV_PCM_INFO_PAUSE,
 53         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
 54         .period_bytes_min       = 256,          /* lighting DMA overhead */
 55         .period_bytes_max       = 2 * 0xffff,   /* if 2 bytes format */
 56         .periods_min            = 8,
 57         .periods_max            = 1024,         /* no limit */
 58         .buffer_bytes_max       = ATMEL_SSC_DMABUF_SIZE,
 59 };
 60 
 61 /**
 62  * atmel_pcm_dma_irq: SSC interrupt handler for DMAENGINE enabled SSC
 63  *
 64  * We use DMAENGINE to send/receive data to/from SSC so this ISR is only to
 65  * check if any overrun occured.
 66  */
 67 static void atmel_pcm_dma_irq(u32 ssc_sr,
 68         struct snd_pcm_substream *substream)
 69 {
 70         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 71         struct atmel_pcm_dma_params *prtd;
 72 
 73         prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 74 
 75         if (ssc_sr & prtd->mask->ssc_error) {
 76                 if (snd_pcm_running(substream))
 77                         pr_warn("atmel-pcm: buffer %s on %s (SSC_SR=%#x)\n",
 78                                 substream->stream == SNDRV_PCM_STREAM_PLAYBACK
 79                                 ? "underrun" : "overrun", prtd->name,
 80                                 ssc_sr);
 81 
 82                 /* stop RX and capture: will be enabled again at restart */
 83                 ssc_writex(prtd->ssc->regs, SSC_CR, prtd->mask->ssc_disable);
 84                 snd_pcm_stream_lock(substream);
 85                 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
 86                 snd_pcm_stream_unlock(substream);
 87 
 88                 /* now drain RHR and read status to remove xrun condition */
 89                 ssc_readx(prtd->ssc->regs, SSC_RHR);
 90                 ssc_readx(prtd->ssc->regs, SSC_SR);
 91         }
 92 }
 93 
 94 static int atmel_pcm_configure_dma(struct snd_pcm_substream *substream,
 95         struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config)
 96 {
 97         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 98         struct atmel_pcm_dma_params *prtd;
 99         struct ssc_device *ssc;
100         int ret;
101 
102         prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
103         ssc = prtd->ssc;
104 
105         ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
106         if (ret) {
107                 pr_err("atmel-pcm: hwparams to dma slave configure failed\n");
108                 return ret;
109         }
110 
111         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
112                 slave_config->dst_addr = ssc->phybase + SSC_THR;
113                 slave_config->dst_maxburst = 1;
114         } else {
115                 slave_config->src_addr = ssc->phybase + SSC_RHR;
116                 slave_config->src_maxburst = 1;
117         }
118 
119         prtd->dma_intr_handler = atmel_pcm_dma_irq;
120 
121         return 0;
122 }
123 
124 static const struct snd_dmaengine_pcm_config atmel_dmaengine_pcm_config = {
125         .prepare_slave_config = atmel_pcm_configure_dma,
126         .pcm_hardware = &atmel_pcm_dma_hardware,
127         .prealloc_buffer_size = ATMEL_SSC_DMABUF_SIZE,
128 };
129 
130 int atmel_pcm_dma_platform_register(struct device *dev)
131 {
132         return snd_dmaengine_pcm_register(dev, &atmel_dmaengine_pcm_config,
133                         SND_DMAENGINE_PCM_FLAG_NO_RESIDUE);
134 }
135 EXPORT_SYMBOL(atmel_pcm_dma_platform_register);
136 
137 void atmel_pcm_dma_platform_unregister(struct device *dev)
138 {
139         snd_dmaengine_pcm_unregister(dev);
140 }
141 EXPORT_SYMBOL(atmel_pcm_dma_platform_unregister);
142 
143 MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
144 MODULE_DESCRIPTION("Atmel DMA based PCM module");
145 MODULE_LICENSE("GPL");
146 

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