![Takashi Iwai](/assets/img/avatar_default.png)
This header file exists only for some hacks to adapt alsa-driver tree. It's useless for building in the kernel. Let's move a few lines in it to sound/core.h and remove it. With this patch, sound/driver.h isn't removed but has just a single compile warning to include it. This should be really killed in future. Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
432 lines
12 KiB
C
432 lines
12 KiB
C
/*
|
|
* at91-pcm.c -- ALSA PCM interface for the Atmel AT91 SoC
|
|
*
|
|
* Author: Frank Mandarino <fmandarino@endrelia.com>
|
|
* Endrelia Technologies Inc.
|
|
* Created: Mar 3, 2006
|
|
*
|
|
* Based on pxa2xx-pcm.c by:
|
|
*
|
|
* Author: Nicolas Pitre
|
|
* Created: Nov 30, 2004
|
|
* Copyright: (C) 2004 MontaVista Software, Inc.
|
|
*
|
|
* 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/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/atmel_pdc.h>
|
|
|
|
#include <sound/core.h>
|
|
#include <sound/pcm.h>
|
|
#include <sound/pcm_params.h>
|
|
#include <sound/soc.h>
|
|
|
|
#include <asm/arch/hardware.h>
|
|
#include <asm/arch/at91_ssc.h>
|
|
|
|
#include "at91-pcm.h"
|
|
|
|
#if 0
|
|
#define DBG(x...) printk(KERN_INFO "at91-pcm: " x)
|
|
#else
|
|
#define DBG(x...)
|
|
#endif
|
|
|
|
static const struct snd_pcm_hardware at91_pcm_hardware = {
|
|
.info = SNDRV_PCM_INFO_MMAP |
|
|
SNDRV_PCM_INFO_MMAP_VALID |
|
|
SNDRV_PCM_INFO_INTERLEAVED |
|
|
SNDRV_PCM_INFO_PAUSE,
|
|
.formats = SNDRV_PCM_FMTBIT_S16_LE,
|
|
.period_bytes_min = 32,
|
|
.period_bytes_max = 8192,
|
|
.periods_min = 2,
|
|
.periods_max = 1024,
|
|
.buffer_bytes_max = 32 * 1024,
|
|
};
|
|
|
|
struct at91_runtime_data {
|
|
struct at91_pcm_dma_params *params;
|
|
dma_addr_t dma_buffer; /* physical address of dma buffer */
|
|
dma_addr_t dma_buffer_end; /* first address beyond DMA buffer */
|
|
size_t period_size;
|
|
dma_addr_t period_ptr; /* physical address of next period */
|
|
u32 pdc_xpr_save; /* PDC register save */
|
|
u32 pdc_xcr_save;
|
|
u32 pdc_xnpr_save;
|
|
u32 pdc_xncr_save;
|
|
};
|
|
|
|
static void at91_pcm_dma_irq(u32 ssc_sr,
|
|
struct snd_pcm_substream *substream)
|
|
{
|
|
struct at91_runtime_data *prtd = substream->runtime->private_data;
|
|
struct at91_pcm_dma_params *params = prtd->params;
|
|
static int count = 0;
|
|
|
|
count++;
|
|
|
|
if (ssc_sr & params->mask->ssc_endbuf) {
|
|
|
|
printk(KERN_WARNING
|
|
"at91-pcm: buffer %s on %s (SSC_SR=%#x, count=%d)\n",
|
|
substream->stream == SNDRV_PCM_STREAM_PLAYBACK
|
|
? "underrun" : "overrun",
|
|
params->name, ssc_sr, count);
|
|
|
|
/* re-start the PDC */
|
|
at91_ssc_write(params->ssc_base + ATMEL_PDC_PTCR, params->mask->pdc_disable);
|
|
|
|
prtd->period_ptr += prtd->period_size;
|
|
if (prtd->period_ptr >= prtd->dma_buffer_end) {
|
|
prtd->period_ptr = prtd->dma_buffer;
|
|
}
|
|
|
|
at91_ssc_write(params->ssc_base + params->pdc->xpr, prtd->period_ptr);
|
|
at91_ssc_write(params->ssc_base + params->pdc->xcr,
|
|
prtd->period_size / params->pdc_xfer_size);
|
|
|
|
at91_ssc_write(params->ssc_base + ATMEL_PDC_PTCR, params->mask->pdc_enable);
|
|
}
|
|
|
|
if (ssc_sr & params->mask->ssc_endx) {
|
|
|
|
/* Load the PDC next pointer and counter registers */
|
|
prtd->period_ptr += prtd->period_size;
|
|
if (prtd->period_ptr >= prtd->dma_buffer_end) {
|
|
prtd->period_ptr = prtd->dma_buffer;
|
|
}
|
|
at91_ssc_write(params->ssc_base + params->pdc->xnpr, prtd->period_ptr);
|
|
at91_ssc_write(params->ssc_base + params->pdc->xncr,
|
|
prtd->period_size / params->pdc_xfer_size);
|
|
}
|
|
|
|
snd_pcm_period_elapsed(substream);
|
|
}
|
|
|
|
static int at91_pcm_hw_params(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_hw_params *params)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct at91_runtime_data *prtd = runtime->private_data;
|
|
struct snd_soc_pcm_runtime *rtd = substream->private_data;
|
|
|
|
/* this may get called several times by oss emulation
|
|
* with different params */
|
|
|
|
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
|
|
runtime->dma_bytes = params_buffer_bytes(params);
|
|
|
|
prtd->params = rtd->dai->cpu_dai->dma_data;
|
|
prtd->params->dma_intr_handler = at91_pcm_dma_irq;
|
|
|
|
prtd->dma_buffer = runtime->dma_addr;
|
|
prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes;
|
|
prtd->period_size = params_period_bytes(params);
|
|
|
|
DBG("hw_params: DMA for %s initialized (dma_bytes=%d, period_size=%d)\n",
|
|
prtd->params->name, runtime->dma_bytes, prtd->period_size);
|
|
return 0;
|
|
}
|
|
|
|
static int at91_pcm_hw_free(struct snd_pcm_substream *substream)
|
|
{
|
|
struct at91_runtime_data *prtd = substream->runtime->private_data;
|
|
struct at91_pcm_dma_params *params = prtd->params;
|
|
|
|
if (params != NULL) {
|
|
at91_ssc_write(params->ssc_base + ATMEL_PDC_PTCR, params->mask->pdc_disable);
|
|
prtd->params->dma_intr_handler = NULL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int at91_pcm_prepare(struct snd_pcm_substream *substream)
|
|
{
|
|
struct at91_runtime_data *prtd = substream->runtime->private_data;
|
|
struct at91_pcm_dma_params *params = prtd->params;
|
|
|
|
at91_ssc_write(params->ssc_base + AT91_SSC_IDR,
|
|
params->mask->ssc_endx | params->mask->ssc_endbuf);
|
|
|
|
at91_ssc_write(params->ssc_base + ATMEL_PDC_PTCR, params->mask->pdc_disable);
|
|
return 0;
|
|
}
|
|
|
|
static int at91_pcm_trigger(struct snd_pcm_substream *substream,
|
|
int cmd)
|
|
{
|
|
struct at91_runtime_data *prtd = substream->runtime->private_data;
|
|
struct at91_pcm_dma_params *params = prtd->params;
|
|
int ret = 0;
|
|
|
|
switch (cmd) {
|
|
case SNDRV_PCM_TRIGGER_START:
|
|
prtd->period_ptr = prtd->dma_buffer;
|
|
|
|
at91_ssc_write(params->ssc_base + params->pdc->xpr, prtd->period_ptr);
|
|
at91_ssc_write(params->ssc_base + params->pdc->xcr,
|
|
prtd->period_size / params->pdc_xfer_size);
|
|
|
|
prtd->period_ptr += prtd->period_size;
|
|
at91_ssc_write(params->ssc_base + params->pdc->xnpr, prtd->period_ptr);
|
|
at91_ssc_write(params->ssc_base + params->pdc->xncr,
|
|
prtd->period_size / params->pdc_xfer_size);
|
|
|
|
DBG("trigger: period_ptr=%lx, xpr=%lx, xcr=%ld, xnpr=%lx, xncr=%ld\n",
|
|
(unsigned long) prtd->period_ptr,
|
|
at91_ssc_read(params->ssc_base + params->pdc->xpr),
|
|
at91_ssc_read(params->ssc_base + params->pdc->xcr),
|
|
at91_ssc_read(params->ssc_base + params->pdc->xnpr),
|
|
at91_ssc_read(params->ssc_base + params->pdc->xncr));
|
|
|
|
at91_ssc_write(params->ssc_base + AT91_SSC_IER,
|
|
params->mask->ssc_endx | params->mask->ssc_endbuf);
|
|
|
|
at91_ssc_write(params->ssc_base + ATMEL_PDC_PTCR, params->mask->pdc_enable);
|
|
|
|
DBG("sr=%lx imr=%lx\n", at91_ssc_read(params->ssc_base + AT91_SSC_SR),
|
|
at91_ssc_read(params->ssc_base + AT91_SSC_IER));
|
|
break;
|
|
|
|
case SNDRV_PCM_TRIGGER_STOP:
|
|
case SNDRV_PCM_TRIGGER_SUSPEND:
|
|
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
|
|
at91_ssc_write(params->ssc_base + ATMEL_PDC_PTCR, params->mask->pdc_disable);
|
|
break;
|
|
|
|
case SNDRV_PCM_TRIGGER_RESUME:
|
|
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
|
|
at91_ssc_write(params->ssc_base + ATMEL_PDC_PTCR, params->mask->pdc_enable);
|
|
break;
|
|
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static snd_pcm_uframes_t at91_pcm_pointer(
|
|
struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct at91_runtime_data *prtd = runtime->private_data;
|
|
struct at91_pcm_dma_params *params = prtd->params;
|
|
dma_addr_t ptr;
|
|
snd_pcm_uframes_t x;
|
|
|
|
ptr = (dma_addr_t) at91_ssc_read(params->ssc_base + params->pdc->xpr);
|
|
x = bytes_to_frames(runtime, ptr - prtd->dma_buffer);
|
|
|
|
if (x == runtime->buffer_size)
|
|
x = 0;
|
|
return x;
|
|
}
|
|
|
|
static int at91_pcm_open(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct at91_runtime_data *prtd;
|
|
int ret = 0;
|
|
|
|
snd_soc_set_runtime_hwparams(substream, &at91_pcm_hardware);
|
|
|
|
/* ensure that buffer size is a multiple of period size */
|
|
ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
prtd = kzalloc(sizeof(struct at91_runtime_data), GFP_KERNEL);
|
|
if (prtd == NULL) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
runtime->private_data = prtd;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int at91_pcm_close(struct snd_pcm_substream *substream)
|
|
{
|
|
struct at91_runtime_data *prtd = substream->runtime->private_data;
|
|
|
|
kfree(prtd);
|
|
return 0;
|
|
}
|
|
|
|
static int at91_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);
|
|
}
|
|
|
|
struct snd_pcm_ops at91_pcm_ops = {
|
|
.open = at91_pcm_open,
|
|
.close = at91_pcm_close,
|
|
.ioctl = snd_pcm_lib_ioctl,
|
|
.hw_params = at91_pcm_hw_params,
|
|
.hw_free = at91_pcm_hw_free,
|
|
.prepare = at91_pcm_prepare,
|
|
.trigger = at91_pcm_trigger,
|
|
.pointer = at91_pcm_pointer,
|
|
.mmap = at91_pcm_mmap,
|
|
};
|
|
|
|
static int at91_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 = at91_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);
|
|
|
|
DBG("preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
|
|
(void *) buf->area,
|
|
(void *) buf->addr,
|
|
size);
|
|
|
|
if (!buf->area)
|
|
return -ENOMEM;
|
|
|
|
buf->bytes = size;
|
|
return 0;
|
|
}
|
|
|
|
static u64 at91_pcm_dmamask = 0xffffffff;
|
|
|
|
static int at91_pcm_new(struct snd_card *card,
|
|
struct snd_soc_codec_dai *dai, struct snd_pcm *pcm)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!card->dev->dma_mask)
|
|
card->dev->dma_mask = &at91_pcm_dmamask;
|
|
if (!card->dev->coherent_dma_mask)
|
|
card->dev->coherent_dma_mask = 0xffffffff;
|
|
|
|
if (dai->playback.channels_min) {
|
|
ret = at91_pcm_preallocate_dma_buffer(pcm,
|
|
SNDRV_PCM_STREAM_PLAYBACK);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
if (dai->capture.channels_min) {
|
|
ret = at91_pcm_preallocate_dma_buffer(pcm,
|
|
SNDRV_PCM_STREAM_CAPTURE);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void at91_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;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int at91_pcm_suspend(struct platform_device *pdev,
|
|
struct snd_soc_cpu_dai *dai)
|
|
{
|
|
struct snd_pcm_runtime *runtime = dai->runtime;
|
|
struct at91_runtime_data *prtd;
|
|
struct at91_pcm_dma_params *params;
|
|
|
|
if (!runtime)
|
|
return 0;
|
|
|
|
prtd = runtime->private_data;
|
|
params = prtd->params;
|
|
|
|
/* disable the PDC and save the PDC registers */
|
|
|
|
at91_ssc_write(params->ssc_base + ATMEL_PDC_PTCR, params->mask->pdc_disable);
|
|
|
|
prtd->pdc_xpr_save = at91_ssc_read(params->ssc_base + params->pdc->xpr);
|
|
prtd->pdc_xcr_save = at91_ssc_read(params->ssc_base + params->pdc->xcr);
|
|
prtd->pdc_xnpr_save = at91_ssc_read(params->ssc_base + params->pdc->xnpr);
|
|
prtd->pdc_xncr_save = at91_ssc_read(params->ssc_base + params->pdc->xncr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int at91_pcm_resume(struct platform_device *pdev,
|
|
struct snd_soc_cpu_dai *dai)
|
|
{
|
|
struct snd_pcm_runtime *runtime = dai->runtime;
|
|
struct at91_runtime_data *prtd;
|
|
struct at91_pcm_dma_params *params;
|
|
|
|
if (!runtime)
|
|
return 0;
|
|
|
|
prtd = runtime->private_data;
|
|
params = prtd->params;
|
|
|
|
/* restore the PDC registers and enable the PDC */
|
|
at91_ssc_write(params->ssc_base + params->pdc->xpr, prtd->pdc_xpr_save);
|
|
at91_ssc_write(params->ssc_base + params->pdc->xcr, prtd->pdc_xcr_save);
|
|
at91_ssc_write(params->ssc_base + params->pdc->xnpr, prtd->pdc_xnpr_save);
|
|
at91_ssc_write(params->ssc_base + params->pdc->xncr, prtd->pdc_xncr_save);
|
|
|
|
at91_ssc_write(params->ssc_base + ATMEL_PDC_PTCR, params->mask->pdc_enable);
|
|
return 0;
|
|
}
|
|
#else
|
|
#define at91_pcm_suspend NULL
|
|
#define at91_pcm_resume NULL
|
|
#endif
|
|
|
|
struct snd_soc_platform at91_soc_platform = {
|
|
.name = "at91-audio",
|
|
.pcm_ops = &at91_pcm_ops,
|
|
.pcm_new = at91_pcm_new,
|
|
.pcm_free = at91_pcm_free_dma_buffers,
|
|
.suspend = at91_pcm_suspend,
|
|
.resume = at91_pcm_resume,
|
|
};
|
|
|
|
EXPORT_SYMBOL_GPL(at91_soc_platform);
|
|
|
|
MODULE_AUTHOR("Frank Mandarino <fmandarino@endrelia.com>");
|
|
MODULE_DESCRIPTION("Atmel AT91 PCM module");
|
|
MODULE_LICENSE("GPL");
|