[ALSA] ASoC Samsung S3C24xx audio DMA
This patch by Ben Dooks from Simtec Electronics adds ASoC audio DMA support for the Samsung S3C24xx CPU. Signed-off-by: Ben Dooks <ben@simtec.co.uk> Signed-off-by: Graeme Gregory <gg@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lg@opensource.wolfsonmicro.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Ben Dooks
Jaroslav Kysela
parent
c1422a6658
commit
c0f41bb171
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@ -0,0 +1,462 @@
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/*
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* s3c24xx-pcm.c -- ALSA Soc Audio Layer
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*
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* (c) 2006 Wolfson Microelectronics PLC.
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* Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
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*
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* (c) 2004-2005 Simtec Electronics
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* http://armlinux.simtec.co.uk/
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* Ben Dooks <ben@simtec.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* Revision history
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* 11th Dec 2006 Merged with Simtec driver
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* 10th Nov 2006 Initial version.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/dma-mapping.h>
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#include <sound/driver.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <asm/dma.h>
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#include <asm/io.h>
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#include <asm/hardware.h>
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#include <asm/arch/dma.h>
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#include <asm/arch/audio.h>
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#include "s3c24xx-pcm.h"
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#define S3C24XX_PCM_DEBUG 0
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#if S3C24XX_PCM_DEBUG
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#define DBG(x...) printk(KERN_DEBUG x)
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#else
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#define DBG(x...)
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#endif
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static const struct snd_pcm_hardware s3c24xx_pcm_hardware = {
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.info = SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID,
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.formats = SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_U16_LE |
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SNDRV_PCM_FMTBIT_U8 |
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SNDRV_PCM_FMTBIT_S8,
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.channels_min = 2,
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.channels_max = 2,
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.buffer_bytes_max = 128*1024,
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.period_bytes_min = PAGE_SIZE,
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.period_bytes_max = PAGE_SIZE*2,
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.periods_min = 2,
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.periods_max = 128,
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.fifo_size = 32,
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};
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struct s3c24xx_runtime_data {
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spinlock_t lock;
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int state;
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unsigned int dma_loaded;
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unsigned int dma_limit;
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unsigned int dma_period;
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dma_addr_t dma_start;
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dma_addr_t dma_pos;
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dma_addr_t dma_end;
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struct s3c24xx_pcm_dma_params *params;
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};
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/* s3c24xx_pcm_enqueue
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*
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* place a dma buffer onto the queue for the dma system
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* to handle.
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*/
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static void s3c24xx_pcm_enqueue(struct snd_pcm_substream *substream)
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{
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struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
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dma_addr_t pos = prtd->dma_pos;
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int ret;
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DBG("Entered %s\n", __FUNCTION__);
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while ( prtd->dma_loaded < prtd->dma_limit) {
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unsigned long len = prtd->dma_period;
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DBG("dma_loaded: %d\n",prtd->dma_loaded);
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if ((pos + len) > prtd->dma_end) {
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len = prtd->dma_end - pos;
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DBG(KERN_DEBUG "%s: corrected dma len %ld\n",
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__FUNCTION__, len);
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}
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ret = s3c2410_dma_enqueue(prtd->params->channel, substream, pos, len);
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if (ret == 0) {
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prtd->dma_loaded++;
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pos += prtd->dma_period;
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if (pos >= prtd->dma_end)
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pos = prtd->dma_start;
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} else
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break;
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}
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prtd->dma_pos = pos;
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}
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static void s3c24xx_audio_buffdone(struct s3c2410_dma_chan *channel,
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void *dev_id, int size,
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enum s3c2410_dma_buffresult result)
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{
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struct snd_pcm_substream *substream = dev_id;
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struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
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DBG("Entered %s\n", __FUNCTION__);
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if (result == S3C2410_RES_ABORT || result == S3C2410_RES_ERR)
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return;
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if (substream)
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snd_pcm_period_elapsed(substream);
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spin_lock(&prtd->lock);
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if (prtd->state & ST_RUNNING) {
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prtd->dma_loaded--;
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s3c24xx_pcm_enqueue(substream);
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}
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spin_unlock(&prtd->lock);
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}
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static int s3c24xx_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct s3c24xx_runtime_data *prtd = runtime->private_data;
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct s3c24xx_pcm_dma_params *dma = rtd->dai->cpu_dai->dma_data;
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unsigned long totbytes = params_buffer_bytes(params);
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int ret=0;
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DBG("Entered %s\n", __FUNCTION__);
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/* return if this is a bufferless transfer e.g.
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* codec <--> BT codec or GSM modem -- lg FIXME */
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if (!dma)
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return 0;
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/* prepare DMA */
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prtd->params = dma;
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DBG("params %p, client %p, channel %d\n", prtd->params,
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prtd->params->client, prtd->params->channel);
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ret = s3c2410_dma_request(prtd->params->channel,
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prtd->params->client, NULL);
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if (ret) {
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DBG(KERN_ERR "failed to get dma channel\n");
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return ret;
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}
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/* channel needs configuring for mem=>device, increment memory addr,
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* sync to pclk, half-word transfers to the IIS-FIFO. */
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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s3c2410_dma_devconfig(prtd->params->channel,
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S3C2410_DMASRC_MEM, S3C2410_DISRCC_INC |
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S3C2410_DISRCC_APB, prtd->params->dma_addr);
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s3c2410_dma_config(prtd->params->channel,
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2, S3C2410_DCON_SYNC_PCLK | S3C2410_DCON_HANDSHAKE);
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} else {
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s3c2410_dma_config(prtd->params->channel,
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2, S3C2410_DCON_HANDSHAKE | S3C2410_DCON_SYNC_PCLK);
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s3c2410_dma_devconfig(prtd->params->channel,
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S3C2410_DMASRC_HW, 0x3,
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prtd->params->dma_addr);
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}
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s3c2410_dma_set_buffdone_fn(prtd->params->channel,
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s3c24xx_audio_buffdone);
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snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
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runtime->dma_bytes = totbytes;
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spin_lock_irq(&prtd->lock);
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prtd->dma_loaded = 0;
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prtd->dma_limit = runtime->hw.periods_min;
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prtd->dma_period = params_period_bytes(params);
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prtd->dma_start = runtime->dma_addr;
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prtd->dma_pos = prtd->dma_start;
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prtd->dma_end = prtd->dma_start + totbytes;
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spin_unlock_irq(&prtd->lock);
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return 0;
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}
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static int s3c24xx_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
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DBG("Entered %s\n", __FUNCTION__);
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/* TODO - do we need to ensure DMA flushed */
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snd_pcm_set_runtime_buffer(substream, NULL);
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if(prtd->params) {
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s3c2410_dma_free(prtd->params->channel, prtd->params->client);
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prtd->params = NULL;
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}
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return 0;
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}
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static int s3c24xx_pcm_prepare(struct snd_pcm_substream *substream)
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{
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struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
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int ret = 0;
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DBG("Entered %s\n", __FUNCTION__);
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/* return if this is a bufferless transfer e.g.
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* codec <--> BT codec or GSM modem -- lg FIXME */
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if (!prtd->params)
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return 0;
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/* flush the DMA channel */
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s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH);
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prtd->dma_loaded = 0;
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prtd->dma_pos = prtd->dma_start;
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/* enqueue dma buffers */
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s3c24xx_pcm_enqueue(substream);
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return ret;
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}
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static int s3c24xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
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int ret = 0;
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DBG("Entered %s\n", __FUNCTION__);
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spin_lock(&prtd->lock);
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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prtd->state |= ST_RUNNING;
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s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_START);
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s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STARTED);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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prtd->state &= ~ST_RUNNING;
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s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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spin_unlock(&prtd->lock);
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return ret;
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}
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static snd_pcm_uframes_t s3c24xx_pcm_pointer(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct s3c24xx_runtime_data *prtd = runtime->private_data;
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unsigned long res;
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dma_addr_t src, dst;
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DBG("Entered %s\n", __FUNCTION__);
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spin_lock(&prtd->lock);
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s3c2410_dma_getposition(prtd->params->channel, &src, &dst);
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if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
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res = dst - prtd->dma_start;
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else
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res = src - prtd->dma_start;
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spin_unlock(&prtd->lock);
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DBG("Pointer %x %x\n",src,dst);
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/* we seem to be getting the odd error from the pcm library due
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* to out-of-bounds pointers. this is maybe due to the dma engine
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* not having loaded the new values for the channel before being
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* callled... (todo - fix )
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*/
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if (res >= snd_pcm_lib_buffer_bytes(substream)) {
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if (res == snd_pcm_lib_buffer_bytes(substream))
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res = 0;
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}
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return bytes_to_frames(substream->runtime, res);
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}
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static int s3c24xx_pcm_open(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct s3c24xx_runtime_data *prtd;
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int ret;
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DBG("Entered %s\n", __FUNCTION__);
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snd_soc_set_runtime_hwparams(substream, &s3c24xx_pcm_hardware);
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prtd = kzalloc(sizeof(struct s3c24xx_runtime_data), GFP_KERNEL);
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if (prtd == NULL)
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return -ENOMEM;
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runtime->private_data = prtd;
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return 0;
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}
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static int s3c24xx_pcm_close(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct s3c24xx_runtime_data *prtd = runtime->private_data;
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DBG("Entered %s\n", __FUNCTION__);
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if(prtd)
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kfree(prtd);
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else
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DBG("s3c24xx_pcm_close called with prtd == NULL\n");
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return 0;
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}
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static int s3c24xx_pcm_mmap(struct snd_pcm_substream *substream,
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struct vm_area_struct *vma)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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DBG("Entered %s\n", __FUNCTION__);
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return dma_mmap_writecombine(substream->pcm->card->dev, vma,
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runtime->dma_area,
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runtime->dma_addr,
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runtime->dma_bytes);
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}
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static struct snd_pcm_ops s3c24xx_pcm_ops = {
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.open = s3c24xx_pcm_open,
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.close = s3c24xx_pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = s3c24xx_pcm_hw_params,
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.hw_free = s3c24xx_pcm_hw_free,
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.prepare = s3c24xx_pcm_prepare,
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.trigger = s3c24xx_pcm_trigger,
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.pointer = s3c24xx_pcm_pointer,
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.mmap = s3c24xx_pcm_mmap,
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};
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static int s3c24xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
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{
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struct snd_pcm_substream *substream = pcm->streams[stream].substream;
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struct snd_dma_buffer *buf = &substream->dma_buffer;
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size_t size = s3c24xx_pcm_hardware.buffer_bytes_max;
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DBG("Entered %s\n", __FUNCTION__);
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buf->dev.type = SNDRV_DMA_TYPE_DEV;
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buf->dev.dev = pcm->card->dev;
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buf->private_data = NULL;
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buf->area = dma_alloc_writecombine(pcm->card->dev, size,
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&buf->addr, GFP_KERNEL);
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if (!buf->area)
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return -ENOMEM;
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buf->bytes = size;
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return 0;
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}
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static void s3c24xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
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{
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struct snd_pcm_substream *substream;
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struct snd_dma_buffer *buf;
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int stream;
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DBG("Entered %s\n", __FUNCTION__);
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for (stream = 0; stream < 2; stream++) {
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substream = pcm->streams[stream].substream;
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if (!substream)
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continue;
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buf = &substream->dma_buffer;
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if (!buf->area)
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continue;
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dma_free_writecombine(pcm->card->dev, buf->bytes,
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buf->area, buf->addr);
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buf->area = NULL;
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}
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}
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static u64 s3c24xx_pcm_dmamask = DMA_32BIT_MASK;
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static int s3c24xx_pcm_new(struct snd_card *card, struct snd_soc_codec_dai *dai,
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struct snd_pcm *pcm)
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{
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int ret = 0;
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DBG("Entered %s\n", __FUNCTION__);
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if (!card->dev->dma_mask)
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card->dev->dma_mask = &s3c24xx_pcm_dmamask;
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if (!card->dev->coherent_dma_mask)
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card->dev->coherent_dma_mask = 0xffffffff;
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if (dai->playback.channels_min) {
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ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_PLAYBACK);
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if (ret)
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goto out;
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}
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if (dai->capture.channels_min) {
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ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
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SNDRV_PCM_STREAM_CAPTURE);
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if (ret)
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goto out;
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}
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out:
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return ret;
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}
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struct snd_soc_platform s3c24xx_soc_platform = {
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.name = "s3c24xx-audio",
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.pcm_ops = &s3c24xx_pcm_ops,
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.pcm_new = s3c24xx_pcm_new,
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.pcm_free = s3c24xx_pcm_free_dma_buffers,
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};
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EXPORT_SYMBOL_GPL(s3c24xx_soc_platform);
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MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
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MODULE_DESCRIPTION("Samsung S3C24XX PCM DMA module");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
|
@ -0,0 +1,32 @@
|
|||
/*
|
||||
* s3c24xx-pcm.h --
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
* ALSA PCM interface for the Samsung S3C24xx CPU
|
||||
*/
|
||||
|
||||
#ifndef _S3C24XX_PCM_H
|
||||
#define _S3C24XX_PCM_H
|
||||
|
||||
#define ST_RUNNING (1<<0)
|
||||
#define ST_OPENED (1<<1)
|
||||
|
||||
struct s3c24xx_pcm_dma_params {
|
||||
struct s3c2410_dma_client *client; /* stream identifier */
|
||||
int channel; /* Channel ID */
|
||||
dma_addr_t dma_addr;
|
||||
};
|
||||
|
||||
#define S3C24XX_DAI_I2S 0
|
||||
|
||||
extern struct snd_soc_cpu_dai s3c24xx_i2s_dai;
|
||||
|
||||
/* platform data */
|
||||
extern struct snd_soc_platform s3c24xx_soc_platform;
|
||||
extern struct snd_ac97_bus_ops s3c24xx_ac97_ops;
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue