mirror of
https://github.com/torvalds/linux.git
synced 2024-11-17 09:31:50 +00:00
[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
462
sound/soc/s3c24xx/s3c24xx-pcm.c
Normal file
462
sound/soc/s3c24xx/s3c24xx-pcm.c
Normal file
@ -0,0 +1,462 @@
|
||||
/*
|
||||
* s3c24xx-pcm.c -- ALSA Soc Audio Layer
|
||||
*
|
||||
* (c) 2006 Wolfson Microelectronics PLC.
|
||||
* Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
|
||||
*
|
||||
* (c) 2004-2005 Simtec Electronics
|
||||
* http://armlinux.simtec.co.uk/
|
||||
* Ben Dooks <ben@simtec.co.uk>
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
* Revision history
|
||||
* 11th Dec 2006 Merged with Simtec driver
|
||||
* 10th Nov 2006 Initial version.
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/dma-mapping.h>
|
||||
|
||||
#include <sound/driver.h>
|
||||
#include <sound/core.h>
|
||||
#include <sound/pcm.h>
|
||||
#include <sound/pcm_params.h>
|
||||
#include <sound/soc.h>
|
||||
|
||||
#include <asm/dma.h>
|
||||
#include <asm/io.h>
|
||||
#include <asm/hardware.h>
|
||||
#include <asm/arch/dma.h>
|
||||
#include <asm/arch/audio.h>
|
||||
|
||||
#include "s3c24xx-pcm.h"
|
||||
|
||||
#define S3C24XX_PCM_DEBUG 0
|
||||
#if S3C24XX_PCM_DEBUG
|
||||
#define DBG(x...) printk(KERN_DEBUG x)
|
||||
#else
|
||||
#define DBG(x...)
|
||||
#endif
|
||||
|
||||
static const struct snd_pcm_hardware s3c24xx_pcm_hardware = {
|
||||
.info = SNDRV_PCM_INFO_INTERLEAVED |
|
||||
SNDRV_PCM_INFO_BLOCK_TRANSFER |
|
||||
SNDRV_PCM_INFO_MMAP |
|
||||
SNDRV_PCM_INFO_MMAP_VALID,
|
||||
.formats = SNDRV_PCM_FMTBIT_S16_LE |
|
||||
SNDRV_PCM_FMTBIT_U16_LE |
|
||||
SNDRV_PCM_FMTBIT_U8 |
|
||||
SNDRV_PCM_FMTBIT_S8,
|
||||
.channels_min = 2,
|
||||
.channels_max = 2,
|
||||
.buffer_bytes_max = 128*1024,
|
||||
.period_bytes_min = PAGE_SIZE,
|
||||
.period_bytes_max = PAGE_SIZE*2,
|
||||
.periods_min = 2,
|
||||
.periods_max = 128,
|
||||
.fifo_size = 32,
|
||||
};
|
||||
|
||||
struct s3c24xx_runtime_data {
|
||||
spinlock_t lock;
|
||||
int state;
|
||||
unsigned int dma_loaded;
|
||||
unsigned int dma_limit;
|
||||
unsigned int dma_period;
|
||||
dma_addr_t dma_start;
|
||||
dma_addr_t dma_pos;
|
||||
dma_addr_t dma_end;
|
||||
struct s3c24xx_pcm_dma_params *params;
|
||||
};
|
||||
|
||||
/* s3c24xx_pcm_enqueue
|
||||
*
|
||||
* place a dma buffer onto the queue for the dma system
|
||||
* to handle.
|
||||
*/
|
||||
static void s3c24xx_pcm_enqueue(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
|
||||
dma_addr_t pos = prtd->dma_pos;
|
||||
int ret;
|
||||
|
||||
DBG("Entered %s\n", __FUNCTION__);
|
||||
|
||||
while ( prtd->dma_loaded < prtd->dma_limit) {
|
||||
unsigned long len = prtd->dma_period;
|
||||
|
||||
DBG("dma_loaded: %d\n",prtd->dma_loaded);
|
||||
|
||||
if ((pos + len) > prtd->dma_end) {
|
||||
len = prtd->dma_end - pos;
|
||||
DBG(KERN_DEBUG "%s: corrected dma len %ld\n",
|
||||
__FUNCTION__, len);
|
||||
}
|
||||
|
||||
ret = s3c2410_dma_enqueue(prtd->params->channel, substream, pos, len);
|
||||
|
||||
if (ret == 0) {
|
||||
prtd->dma_loaded++;
|
||||
pos += prtd->dma_period;
|
||||
if (pos >= prtd->dma_end)
|
||||
pos = prtd->dma_start;
|
||||
} else
|
||||
break;
|
||||
}
|
||||
|
||||
prtd->dma_pos = pos;
|
||||
}
|
||||
|
||||
static void s3c24xx_audio_buffdone(struct s3c2410_dma_chan *channel,
|
||||
void *dev_id, int size,
|
||||
enum s3c2410_dma_buffresult result)
|
||||
{
|
||||
struct snd_pcm_substream *substream = dev_id;
|
||||
struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
|
||||
|
||||
DBG("Entered %s\n", __FUNCTION__);
|
||||
|
||||
if (result == S3C2410_RES_ABORT || result == S3C2410_RES_ERR)
|
||||
return;
|
||||
|
||||
if (substream)
|
||||
snd_pcm_period_elapsed(substream);
|
||||
|
||||
spin_lock(&prtd->lock);
|
||||
if (prtd->state & ST_RUNNING) {
|
||||
prtd->dma_loaded--;
|
||||
s3c24xx_pcm_enqueue(substream);
|
||||
}
|
||||
|
||||
spin_unlock(&prtd->lock);
|
||||
}
|
||||
|
||||
static int s3c24xx_pcm_hw_params(struct snd_pcm_substream *substream,
|
||||
struct snd_pcm_hw_params *params)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
struct s3c24xx_runtime_data *prtd = runtime->private_data;
|
||||
struct snd_soc_pcm_runtime *rtd = substream->private_data;
|
||||
struct s3c24xx_pcm_dma_params *dma = rtd->dai->cpu_dai->dma_data;
|
||||
unsigned long totbytes = params_buffer_bytes(params);
|
||||
int ret=0;
|
||||
|
||||
DBG("Entered %s\n", __FUNCTION__);
|
||||
|
||||
/* return if this is a bufferless transfer e.g.
|
||||
* codec <--> BT codec or GSM modem -- lg FIXME */
|
||||
if (!dma)
|
||||
return 0;
|
||||
|
||||
/* prepare DMA */
|
||||
prtd->params = dma;
|
||||
|
||||
DBG("params %p, client %p, channel %d\n", prtd->params,
|
||||
prtd->params->client, prtd->params->channel);
|
||||
|
||||
ret = s3c2410_dma_request(prtd->params->channel,
|
||||
prtd->params->client, NULL);
|
||||
|
||||
if (ret) {
|
||||
DBG(KERN_ERR "failed to get dma channel\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* channel needs configuring for mem=>device, increment memory addr,
|
||||
* sync to pclk, half-word transfers to the IIS-FIFO. */
|
||||
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
|
||||
s3c2410_dma_devconfig(prtd->params->channel,
|
||||
S3C2410_DMASRC_MEM, S3C2410_DISRCC_INC |
|
||||
S3C2410_DISRCC_APB, prtd->params->dma_addr);
|
||||
|
||||
s3c2410_dma_config(prtd->params->channel,
|
||||
2, S3C2410_DCON_SYNC_PCLK | S3C2410_DCON_HANDSHAKE);
|
||||
} else {
|
||||
s3c2410_dma_config(prtd->params->channel,
|
||||
2, S3C2410_DCON_HANDSHAKE | S3C2410_DCON_SYNC_PCLK);
|
||||
|
||||
s3c2410_dma_devconfig(prtd->params->channel,
|
||||
S3C2410_DMASRC_HW, 0x3,
|
||||
prtd->params->dma_addr);
|
||||
}
|
||||
|
||||
s3c2410_dma_set_buffdone_fn(prtd->params->channel,
|
||||
s3c24xx_audio_buffdone);
|
||||
|
||||
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
|
||||
|
||||
runtime->dma_bytes = totbytes;
|
||||
|
||||
spin_lock_irq(&prtd->lock);
|
||||
prtd->dma_loaded = 0;
|
||||
prtd->dma_limit = runtime->hw.periods_min;
|
||||
prtd->dma_period = params_period_bytes(params);
|
||||
prtd->dma_start = runtime->dma_addr;
|
||||
prtd->dma_pos = prtd->dma_start;
|
||||
prtd->dma_end = prtd->dma_start + totbytes;
|
||||
spin_unlock_irq(&prtd->lock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int s3c24xx_pcm_hw_free(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
|
||||
|
||||
DBG("Entered %s\n", __FUNCTION__);
|
||||
|
||||
/* TODO - do we need to ensure DMA flushed */
|
||||
snd_pcm_set_runtime_buffer(substream, NULL);
|
||||
|
||||
if(prtd->params) {
|
||||
s3c2410_dma_free(prtd->params->channel, prtd->params->client);
|
||||
prtd->params = NULL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int s3c24xx_pcm_prepare(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
|
||||
int ret = 0;
|
||||
|
||||
DBG("Entered %s\n", __FUNCTION__);
|
||||
|
||||
/* return if this is a bufferless transfer e.g.
|
||||
* codec <--> BT codec or GSM modem -- lg FIXME */
|
||||
if (!prtd->params)
|
||||
return 0;
|
||||
|
||||
/* flush the DMA channel */
|
||||
s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH);
|
||||
prtd->dma_loaded = 0;
|
||||
prtd->dma_pos = prtd->dma_start;
|
||||
|
||||
/* enqueue dma buffers */
|
||||
s3c24xx_pcm_enqueue(substream);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int s3c24xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
|
||||
{
|
||||
struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
|
||||
int ret = 0;
|
||||
|
||||
DBG("Entered %s\n", __FUNCTION__);
|
||||
|
||||
spin_lock(&prtd->lock);
|
||||
|
||||
switch (cmd) {
|
||||
case SNDRV_PCM_TRIGGER_START:
|
||||
case SNDRV_PCM_TRIGGER_RESUME:
|
||||
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
|
||||
prtd->state |= ST_RUNNING;
|
||||
s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_START);
|
||||
s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STARTED);
|
||||
break;
|
||||
|
||||
case SNDRV_PCM_TRIGGER_STOP:
|
||||
case SNDRV_PCM_TRIGGER_SUSPEND:
|
||||
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
|
||||
prtd->state &= ~ST_RUNNING;
|
||||
s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP);
|
||||
break;
|
||||
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
spin_unlock(&prtd->lock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static snd_pcm_uframes_t s3c24xx_pcm_pointer(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
struct s3c24xx_runtime_data *prtd = runtime->private_data;
|
||||
unsigned long res;
|
||||
dma_addr_t src, dst;
|
||||
|
||||
DBG("Entered %s\n", __FUNCTION__);
|
||||
|
||||
spin_lock(&prtd->lock);
|
||||
s3c2410_dma_getposition(prtd->params->channel, &src, &dst);
|
||||
|
||||
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
|
||||
res = dst - prtd->dma_start;
|
||||
else
|
||||
res = src - prtd->dma_start;
|
||||
|
||||
spin_unlock(&prtd->lock);
|
||||
|
||||
DBG("Pointer %x %x\n",src,dst);
|
||||
|
||||
/* we seem to be getting the odd error from the pcm library due
|
||||
* to out-of-bounds pointers. this is maybe due to the dma engine
|
||||
* not having loaded the new values for the channel before being
|
||||
* callled... (todo - fix )
|
||||
*/
|
||||
|
||||
if (res >= snd_pcm_lib_buffer_bytes(substream)) {
|
||||
if (res == snd_pcm_lib_buffer_bytes(substream))
|
||||
res = 0;
|
||||
}
|
||||
|
||||
return bytes_to_frames(substream->runtime, res);
|
||||
}
|
||||
|
||||
static int s3c24xx_pcm_open(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
struct s3c24xx_runtime_data *prtd;
|
||||
|
||||
int ret;
|
||||
|
||||
DBG("Entered %s\n", __FUNCTION__);
|
||||
|
||||
snd_soc_set_runtime_hwparams(substream, &s3c24xx_pcm_hardware);
|
||||
|
||||
prtd = kzalloc(sizeof(struct s3c24xx_runtime_data), GFP_KERNEL);
|
||||
if (prtd == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
runtime->private_data = prtd;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int s3c24xx_pcm_close(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
struct s3c24xx_runtime_data *prtd = runtime->private_data;
|
||||
|
||||
DBG("Entered %s\n", __FUNCTION__);
|
||||
|
||||
if(prtd)
|
||||
kfree(prtd);
|
||||
else
|
||||
DBG("s3c24xx_pcm_close called with prtd == NULL\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int s3c24xx_pcm_mmap(struct snd_pcm_substream *substream,
|
||||
struct vm_area_struct *vma)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
|
||||
DBG("Entered %s\n", __FUNCTION__);
|
||||
|
||||
return dma_mmap_writecombine(substream->pcm->card->dev, vma,
|
||||
runtime->dma_area,
|
||||
runtime->dma_addr,
|
||||
runtime->dma_bytes);
|
||||
}
|
||||
|
||||
static struct snd_pcm_ops s3c24xx_pcm_ops = {
|
||||
.open = s3c24xx_pcm_open,
|
||||
.close = s3c24xx_pcm_close,
|
||||
.ioctl = snd_pcm_lib_ioctl,
|
||||
.hw_params = s3c24xx_pcm_hw_params,
|
||||
.hw_free = s3c24xx_pcm_hw_free,
|
||||
.prepare = s3c24xx_pcm_prepare,
|
||||
.trigger = s3c24xx_pcm_trigger,
|
||||
.pointer = s3c24xx_pcm_pointer,
|
||||
.mmap = s3c24xx_pcm_mmap,
|
||||
};
|
||||
|
||||
static int s3c24xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
|
||||
{
|
||||
struct snd_pcm_substream *substream = pcm->streams[stream].substream;
|
||||
struct snd_dma_buffer *buf = &substream->dma_buffer;
|
||||
size_t size = s3c24xx_pcm_hardware.buffer_bytes_max;
|
||||
|
||||
DBG("Entered %s\n", __FUNCTION__);
|
||||
|
||||
buf->dev.type = SNDRV_DMA_TYPE_DEV;
|
||||
buf->dev.dev = pcm->card->dev;
|
||||
buf->private_data = NULL;
|
||||
buf->area = dma_alloc_writecombine(pcm->card->dev, size,
|
||||
&buf->addr, GFP_KERNEL);
|
||||
if (!buf->area)
|
||||
return -ENOMEM;
|
||||
buf->bytes = size;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void s3c24xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
|
||||
{
|
||||
struct snd_pcm_substream *substream;
|
||||
struct snd_dma_buffer *buf;
|
||||
int stream;
|
||||
|
||||
DBG("Entered %s\n", __FUNCTION__);
|
||||
|
||||
for (stream = 0; stream < 2; stream++) {
|
||||
substream = pcm->streams[stream].substream;
|
||||
if (!substream)
|
||||
continue;
|
||||
|
||||
buf = &substream->dma_buffer;
|
||||
if (!buf->area)
|
||||
continue;
|
||||
|
||||
dma_free_writecombine(pcm->card->dev, buf->bytes,
|
||||
buf->area, buf->addr);
|
||||
buf->area = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
static u64 s3c24xx_pcm_dmamask = DMA_32BIT_MASK;
|
||||
|
||||
static int s3c24xx_pcm_new(struct snd_card *card, struct snd_soc_codec_dai *dai,
|
||||
struct snd_pcm *pcm)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
DBG("Entered %s\n", __FUNCTION__);
|
||||
|
||||
if (!card->dev->dma_mask)
|
||||
card->dev->dma_mask = &s3c24xx_pcm_dmamask;
|
||||
if (!card->dev->coherent_dma_mask)
|
||||
card->dev->coherent_dma_mask = 0xffffffff;
|
||||
|
||||
if (dai->playback.channels_min) {
|
||||
ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
|
||||
SNDRV_PCM_STREAM_PLAYBACK);
|
||||
if (ret)
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (dai->capture.channels_min) {
|
||||
ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
|
||||
SNDRV_PCM_STREAM_CAPTURE);
|
||||
if (ret)
|
||||
goto out;
|
||||
}
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
struct snd_soc_platform s3c24xx_soc_platform = {
|
||||
.name = "s3c24xx-audio",
|
||||
.pcm_ops = &s3c24xx_pcm_ops,
|
||||
.pcm_new = s3c24xx_pcm_new,
|
||||
.pcm_free = s3c24xx_pcm_free_dma_buffers,
|
||||
};
|
||||
|
||||
EXPORT_SYMBOL_GPL(s3c24xx_soc_platform);
|
||||
|
||||
MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
|
||||
MODULE_DESCRIPTION("Samsung S3C24XX PCM DMA module");
|
||||
MODULE_LICENSE("GPL");
|
||||
32
sound/soc/s3c24xx/s3c24xx-pcm.h
Normal file
32
sound/soc/s3c24xx/s3c24xx-pcm.h
Normal file
@ -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
Block a user