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acrn-kernel/sound/soc/s3c24xx/s3c24xx-pcm.c

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/*
* 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/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 |
SNDRV_PCM_INFO_PAUSE |
SNDRV_PCM_INFO_RESUME,
.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;
DBG("Entered %s\n", __FUNCTION__);
if (result == S3C2410_RES_ABORT || result == S3C2410_RES_ERR)
return;
prtd = substream->runtime->private_data;
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;
/* this may get called several times by oss emulation
* with different params -HW */
if (prtd->params == NULL) {
/* 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;
}
}
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;
/* 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,
prtd->params->dma_size,
S3C2410_DCON_SYNC_PCLK |
S3C2410_DCON_HANDSHAKE);
} else {
s3c2410_dma_config(prtd->params->channel,
prtd->params->dma_size,
S3C2410_DCON_HANDSHAKE |
S3C2410_DCON_SYNC_PCLK);
s3c2410_dma_devconfig(prtd->params->channel,
S3C2410_DMASRC_HW, 0x3,
prtd->params->dma_addr);
}
/* 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;
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;
spin_lock_init(&prtd->lock);
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");
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