![Takashi Iwai](/assets/img/avatar_default.png)
Add a new helper function snd_pcm_stop_xrun() to the standard sequnce lock/snd_pcm_stop(XRUN)/unlock by a single call, and replace the existing open codes with this helper. The function checks the PCM running state to prevent setting the wrong state, too, for more safety. Signed-off-by: Takashi Iwai <tiwai@suse.de>
320 lines
7.9 KiB
C
320 lines
7.9 KiB
C
/*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/dmaengine.h>
|
|
|
|
#include <sound/core.h>
|
|
#include <sound/pcm.h>
|
|
#include <sound/pcm_params.h>
|
|
#include <sound/pxa2xx-lib.h>
|
|
#include <sound/dmaengine_pcm.h>
|
|
|
|
#include <mach/dma.h>
|
|
|
|
#include "pxa2xx-pcm.h"
|
|
|
|
static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
|
|
.info = SNDRV_PCM_INFO_MMAP |
|
|
SNDRV_PCM_INFO_MMAP_VALID |
|
|
SNDRV_PCM_INFO_INTERLEAVED |
|
|
SNDRV_PCM_INFO_PAUSE |
|
|
SNDRV_PCM_INFO_RESUME,
|
|
.formats = SNDRV_PCM_FMTBIT_S16_LE |
|
|
SNDRV_PCM_FMTBIT_S24_LE |
|
|
SNDRV_PCM_FMTBIT_S32_LE,
|
|
.period_bytes_min = 32,
|
|
.period_bytes_max = 8192 - 32,
|
|
.periods_min = 1,
|
|
.periods_max = PAGE_SIZE/sizeof(pxa_dma_desc),
|
|
.buffer_bytes_max = 128 * 1024,
|
|
.fifo_size = 32,
|
|
};
|
|
|
|
int __pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_hw_params *params)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct pxa2xx_runtime_data *rtd = runtime->private_data;
|
|
size_t totsize = params_buffer_bytes(params);
|
|
size_t period = params_period_bytes(params);
|
|
pxa_dma_desc *dma_desc;
|
|
dma_addr_t dma_buff_phys, next_desc_phys;
|
|
u32 dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG;
|
|
|
|
/* temporary transition hack */
|
|
switch (rtd->params->addr_width) {
|
|
case DMA_SLAVE_BUSWIDTH_1_BYTE:
|
|
dcmd |= DCMD_WIDTH1;
|
|
break;
|
|
case DMA_SLAVE_BUSWIDTH_2_BYTES:
|
|
dcmd |= DCMD_WIDTH2;
|
|
break;
|
|
case DMA_SLAVE_BUSWIDTH_4_BYTES:
|
|
dcmd |= DCMD_WIDTH4;
|
|
break;
|
|
default:
|
|
/* can't happen */
|
|
break;
|
|
}
|
|
|
|
switch (rtd->params->maxburst) {
|
|
case 8:
|
|
dcmd |= DCMD_BURST8;
|
|
break;
|
|
case 16:
|
|
dcmd |= DCMD_BURST16;
|
|
break;
|
|
case 32:
|
|
dcmd |= DCMD_BURST32;
|
|
break;
|
|
}
|
|
|
|
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
|
|
runtime->dma_bytes = totsize;
|
|
|
|
dma_desc = rtd->dma_desc_array;
|
|
next_desc_phys = rtd->dma_desc_array_phys;
|
|
dma_buff_phys = runtime->dma_addr;
|
|
do {
|
|
next_desc_phys += sizeof(pxa_dma_desc);
|
|
dma_desc->ddadr = next_desc_phys;
|
|
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
|
|
dma_desc->dsadr = dma_buff_phys;
|
|
dma_desc->dtadr = rtd->params->addr;
|
|
} else {
|
|
dma_desc->dsadr = rtd->params->addr;
|
|
dma_desc->dtadr = dma_buff_phys;
|
|
}
|
|
if (period > totsize)
|
|
period = totsize;
|
|
dma_desc->dcmd = dcmd | period | DCMD_ENDIRQEN;
|
|
dma_desc++;
|
|
dma_buff_phys += period;
|
|
} while (totsize -= period);
|
|
dma_desc[-1].ddadr = rtd->dma_desc_array_phys;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(__pxa2xx_pcm_hw_params);
|
|
|
|
int __pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
|
|
{
|
|
struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
|
|
|
|
if (rtd && rtd->params && rtd->params->filter_data) {
|
|
unsigned long req = *(unsigned long *) rtd->params->filter_data;
|
|
DRCMR(req) = 0;
|
|
}
|
|
|
|
snd_pcm_set_runtime_buffer(substream, NULL);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(__pxa2xx_pcm_hw_free);
|
|
|
|
int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
|
|
{
|
|
struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
|
|
int ret = 0;
|
|
|
|
switch (cmd) {
|
|
case SNDRV_PCM_TRIGGER_START:
|
|
DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
|
|
DCSR(prtd->dma_ch) = DCSR_RUN;
|
|
break;
|
|
|
|
case SNDRV_PCM_TRIGGER_STOP:
|
|
case SNDRV_PCM_TRIGGER_SUSPEND:
|
|
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
|
|
DCSR(prtd->dma_ch) &= ~DCSR_RUN;
|
|
break;
|
|
|
|
case SNDRV_PCM_TRIGGER_RESUME:
|
|
DCSR(prtd->dma_ch) |= DCSR_RUN;
|
|
break;
|
|
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
|
|
DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
|
|
DCSR(prtd->dma_ch) |= DCSR_RUN;
|
|
break;
|
|
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(pxa2xx_pcm_trigger);
|
|
|
|
snd_pcm_uframes_t
|
|
pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct pxa2xx_runtime_data *prtd = runtime->private_data;
|
|
|
|
dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
|
|
DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch);
|
|
snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
|
|
|
|
if (x == runtime->buffer_size)
|
|
x = 0;
|
|
return x;
|
|
}
|
|
EXPORT_SYMBOL(pxa2xx_pcm_pointer);
|
|
|
|
int __pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
|
|
{
|
|
struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
|
|
unsigned long req;
|
|
|
|
if (!prtd || !prtd->params)
|
|
return 0;
|
|
|
|
if (prtd->dma_ch == -1)
|
|
return -EINVAL;
|
|
|
|
DCSR(prtd->dma_ch) &= ~DCSR_RUN;
|
|
DCSR(prtd->dma_ch) = 0;
|
|
DCMD(prtd->dma_ch) = 0;
|
|
req = *(unsigned long *) prtd->params->filter_data;
|
|
DRCMR(req) = prtd->dma_ch | DRCMR_MAPVLD;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(__pxa2xx_pcm_prepare);
|
|
|
|
void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
|
|
{
|
|
struct snd_pcm_substream *substream = dev_id;
|
|
int dcsr;
|
|
|
|
dcsr = DCSR(dma_ch);
|
|
DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
|
|
|
|
if (dcsr & DCSR_ENDINTR) {
|
|
snd_pcm_period_elapsed(substream);
|
|
} else {
|
|
printk(KERN_ERR "DMA error on channel %d (DCSR=%#x)\n",
|
|
dma_ch, dcsr);
|
|
snd_pcm_stop_xrun(substream);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(pxa2xx_pcm_dma_irq);
|
|
|
|
int __pxa2xx_pcm_open(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct pxa2xx_runtime_data *rtd;
|
|
int ret;
|
|
|
|
runtime->hw = pxa2xx_pcm_hardware;
|
|
|
|
/*
|
|
* For mysterious reasons (and despite what the manual says)
|
|
* playback samples are lost if the DMA count is not a multiple
|
|
* of the DMA burst size. Let's add a rule to enforce that.
|
|
*/
|
|
ret = snd_pcm_hw_constraint_step(runtime, 0,
|
|
SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = snd_pcm_hw_constraint_step(runtime, 0,
|
|
SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = snd_pcm_hw_constraint_integer(runtime,
|
|
SNDRV_PCM_HW_PARAM_PERIODS);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = -ENOMEM;
|
|
rtd = kzalloc(sizeof(*rtd), GFP_KERNEL);
|
|
if (!rtd)
|
|
goto out;
|
|
rtd->dma_desc_array =
|
|
dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
|
|
&rtd->dma_desc_array_phys, GFP_KERNEL);
|
|
if (!rtd->dma_desc_array)
|
|
goto err1;
|
|
|
|
rtd->dma_ch = -1;
|
|
runtime->private_data = rtd;
|
|
return 0;
|
|
|
|
err1:
|
|
kfree(rtd);
|
|
out:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(__pxa2xx_pcm_open);
|
|
|
|
int __pxa2xx_pcm_close(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct pxa2xx_runtime_data *rtd = runtime->private_data;
|
|
|
|
dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
|
|
rtd->dma_desc_array, rtd->dma_desc_array_phys);
|
|
kfree(rtd);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(__pxa2xx_pcm_close);
|
|
|
|
int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
return dma_mmap_writecombine(substream->pcm->card->dev, vma,
|
|
runtime->dma_area,
|
|
runtime->dma_addr,
|
|
runtime->dma_bytes);
|
|
}
|
|
EXPORT_SYMBOL(pxa2xx_pcm_mmap);
|
|
|
|
int pxa2xx_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 = pxa2xx_pcm_hardware.buffer_bytes_max;
|
|
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;
|
|
}
|
|
EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
|
|
|
|
void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
|
|
{
|
|
struct snd_pcm_substream *substream;
|
|
struct snd_dma_buffer *buf;
|
|
int stream;
|
|
|
|
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;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
|
|
|
|
MODULE_AUTHOR("Nicolas Pitre");
|
|
MODULE_DESCRIPTION("Intel PXA2xx sound library");
|
|
MODULE_LICENSE("GPL");
|