417 lines
12 KiB
C
417 lines
12 KiB
C
|
/*
|
||
|
|
* atmel-pcm.c -- ALSA PCM interface for the Atmel atmel SoC.
|
||
|
|
*
|
||
|
|
* Copyright (C) 2005 SAN People
|
||
|
|
* Copyright (C) 2008 Atmel
|
||
|
|
*
|
||
|
|
* Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
|
||
|
|
*
|
||
|
|
* Based on at91-pcm. by:
|
||
|
|
* Frank Mandarino <fmandarino@endrelia.com>
|
||
|
|
* Copyright 2006 Endrelia Technologies Inc.
|
||
|
|
*
|
||
|
|
* 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 as published by
|
||
|
|
* the Free Software Foundation; either version 2 of the License, or
|
||
|
|
* (at your option) any later version.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||
|
|
*/
|
||
|
|
|
||
|
|
#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 <linux/atmel-ssc.h>
|
||
|
|
|
||
|
|
#include <sound/core.h>
|
||
|
|
#include <sound/pcm.h>
|
||
|
|
#include <sound/pcm_params.h>
|
||
|
|
#include <sound/soc.h>
|
||
|
|
|
||
|
|
#include "atmel-pcm.h"
|
||
|
|
|
||
|
|
|
||
|
|
static int atmel_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 = ATMEL_SSC_DMABUF_SIZE;
|
||
|
|
|
||
|
|
buf->dev.type = SNDRV_DMA_TYPE_DEV;
|
||
|
|
buf->dev.dev = pcm->card->dev;
|
||
|
|
buf->private_data = NULL;
|
||
|
|
buf->area = dma_alloc_coherent(pcm->card->dev, size,
|
||
|
|
&buf->addr, GFP_KERNEL);
|
||
|
|
pr_debug("atmel-pcm: alloc dma buffer: area=%p, addr=%p, size=%zu\n",
|
||
|
|
(void *)buf->area, (void *)(long)buf->addr, size);
|
||
|
|
|
||
|
|
if (!buf->area)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
buf->bytes = size;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int atmel_pcm_mmap(struct snd_pcm_substream *substream,
|
||
|
|
struct vm_area_struct *vma)
|
||
|
|
{
|
||
|
|
return remap_pfn_range(vma, vma->vm_start,
|
||
|
|
substream->dma_buffer.addr >> PAGE_SHIFT,
|
||
|
|
vma->vm_end - vma->vm_start, vma->vm_page_prot);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int atmel_pcm_new(struct snd_soc_pcm_runtime *rtd)
|
||
|
|
{
|
||
|
|
struct snd_card *card = rtd->card->snd_card;
|
||
|
|
struct snd_pcm *pcm = rtd->pcm;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
|
||
|
|
pr_debug("atmel-pcm: allocating PCM playback DMA buffer\n");
|
||
|
|
ret = atmel_pcm_preallocate_dma_buffer(pcm,
|
||
|
|
SNDRV_PCM_STREAM_PLAYBACK);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
|
||
|
|
pr_debug("atmel-pcm: allocating PCM capture DMA buffer\n");
|
||
|
|
ret = atmel_pcm_preallocate_dma_buffer(pcm,
|
||
|
|
SNDRV_PCM_STREAM_CAPTURE);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void atmel_pcm_free(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_coherent(pcm->card->dev, buf->bytes,
|
||
|
|
buf->area, buf->addr);
|
||
|
|
buf->area = NULL;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*--------------------------------------------------------------------------*\
|
||
|
|
* Hardware definition
|
||
|
|
\*--------------------------------------------------------------------------*/
|
||
|
|
/* TODO: These values were taken from the AT91 platform driver, check
|
||
|
|
* them against real values for AT32
|
||
|
|
*/
|
||
|
|
static const struct snd_pcm_hardware atmel_pcm_hardware = {
|
||
|
|
.info = SNDRV_PCM_INFO_MMAP |
|
||
|
|
SNDRV_PCM_INFO_MMAP_VALID |
|
||
|
|
SNDRV_PCM_INFO_INTERLEAVED |
|
||
|
|
SNDRV_PCM_INFO_PAUSE,
|
||
|
|
.period_bytes_min = 32,
|
||
|
|
.period_bytes_max = 8192,
|
||
|
|
.periods_min = 2,
|
||
|
|
.periods_max = 1024,
|
||
|
|
.buffer_bytes_max = ATMEL_SSC_DMABUF_SIZE,
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
/*--------------------------------------------------------------------------*\
|
||
|
|
* Data types
|
||
|
|
\*--------------------------------------------------------------------------*/
|
||
|
|
struct atmel_runtime_data {
|
||
|
|
struct atmel_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 */
|
||
|
|
};
|
||
|
|
|
||
|
|
/*--------------------------------------------------------------------------*\
|
||
|
|
* ISR
|
||
|
|
\*--------------------------------------------------------------------------*/
|
||
|
|
static void atmel_pcm_dma_irq(u32 ssc_sr,
|
||
|
|
struct snd_pcm_substream *substream)
|
||
|
|
{
|
||
|
|
struct atmel_runtime_data *prtd = substream->runtime->private_data;
|
||
|
|
struct atmel_pcm_dma_params *params = prtd->params;
|
||
|
|
static int count;
|
||
|
|
|
||
|
|
count++;
|
||
|
|
|
||
|
|
if (ssc_sr & params->mask->ssc_endbuf) {
|
||
|
|
pr_warn("atmel-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 */
|
||
|
|
ssc_writex(params->ssc->regs, 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;
|
||
|
|
|
||
|
|
ssc_writex(params->ssc->regs, params->pdc->xpr,
|
||
|
|
prtd->period_ptr);
|
||
|
|
ssc_writex(params->ssc->regs, params->pdc->xcr,
|
||
|
|
prtd->period_size / params->pdc_xfer_size);
|
||
|
|
ssc_writex(params->ssc->regs, 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;
|
||
|
|
|
||
|
|
ssc_writex(params->ssc->regs, params->pdc->xnpr,
|
||
|
|
prtd->period_ptr);
|
||
|
|
ssc_writex(params->ssc->regs, params->pdc->xncr,
|
||
|
|
prtd->period_size / params->pdc_xfer_size);
|
||
|
|
}
|
||
|
|
|
||
|
|
snd_pcm_period_elapsed(substream);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*--------------------------------------------------------------------------*\
|
||
|
|
* PCM operations
|
||
|
|
\*--------------------------------------------------------------------------*/
|
||
|
|
static int atmel_pcm_hw_params(struct snd_pcm_substream *substream,
|
||
|
|
struct snd_pcm_hw_params *params)
|
||
|
|
{
|
||
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
||
|
|
struct atmel_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 = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
|
||
|
|
prtd->params->dma_intr_handler = atmel_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);
|
||
|
|
|
||
|
|
pr_debug("atmel-pcm: "
|
||
|
|
"hw_params: DMA for %s initialized "
|
||
|
|
"(dma_bytes=%zu, period_size=%zu)\n",
|
||
|
|
prtd->params->name,
|
||
|
|
runtime->dma_bytes,
|
||
|
|
prtd->period_size);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int atmel_pcm_hw_free(struct snd_pcm_substream *substream)
|
||
|
|
{
|
||
|
|
struct atmel_runtime_data *prtd = substream->runtime->private_data;
|
||
|
|
struct atmel_pcm_dma_params *params = prtd->params;
|
||
|
|
|
||
|
|
if (params != NULL) {
|
||
|
|
ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
|
||
|
|
params->mask->pdc_disable);
|
||
|
|
prtd->params->dma_intr_handler = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int atmel_pcm_prepare(struct snd_pcm_substream *substream)
|
||
|
|
{
|
||
|
|
struct atmel_runtime_data *prtd = substream->runtime->private_data;
|
||
|
|
struct atmel_pcm_dma_params *params = prtd->params;
|
||
|
|
|
||
|
|
ssc_writex(params->ssc->regs, SSC_IDR,
|
||
|
|
params->mask->ssc_endx | params->mask->ssc_endbuf);
|
||
|
|
ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
|
||
|
|
params->mask->pdc_disable);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int atmel_pcm_trigger(struct snd_pcm_substream *substream,
|
||
|
|
int cmd)
|
||
|
|
{
|
||
|
|
struct snd_pcm_runtime *rtd = substream->runtime;
|
||
|
|
struct atmel_runtime_data *prtd = rtd->private_data;
|
||
|
|
struct atmel_pcm_dma_params *params = prtd->params;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
pr_debug("atmel-pcm:buffer_size = %ld,"
|
||
|
|
"dma_area = %p, dma_bytes = %zu\n",
|
||
|
|
rtd->buffer_size, rtd->dma_area, rtd->dma_bytes);
|
||
|
|
|
||
|
|
switch (cmd) {
|
||
|
|
case SNDRV_PCM_TRIGGER_START:
|
||
|
|
prtd->period_ptr = prtd->dma_buffer;
|
||
|
|
|
||
|
|
ssc_writex(params->ssc->regs, params->pdc->xpr,
|
||
|
|
prtd->period_ptr);
|
||
|
|
ssc_writex(params->ssc->regs, params->pdc->xcr,
|
||
|
|
prtd->period_size / params->pdc_xfer_size);
|
||
|
|
|
||
|
|
prtd->period_ptr += prtd->period_size;
|
||
|
|
ssc_writex(params->ssc->regs, params->pdc->xnpr,
|
||
|
|
prtd->period_ptr);
|
||
|
|
ssc_writex(params->ssc->regs, params->pdc->xncr,
|
||
|
|
prtd->period_size / params->pdc_xfer_size);
|
||
|
|
|
||
|
|
pr_debug("atmel-pcm: trigger: "
|
||
|
|
"period_ptr=%lx, xpr=%u, "
|
||
|
|
"xcr=%u, xnpr=%u, xncr=%u\n",
|
||
|
|
(unsigned long)prtd->period_ptr,
|
||
|
|
ssc_readx(params->ssc->regs, params->pdc->xpr),
|
||
|
|
ssc_readx(params->ssc->regs, params->pdc->xcr),
|
||
|
|
ssc_readx(params->ssc->regs, params->pdc->xnpr),
|
||
|
|
ssc_readx(params->ssc->regs, params->pdc->xncr));
|
||
|
|
|
||
|
|
ssc_writex(params->ssc->regs, SSC_IER,
|
||
|
|
params->mask->ssc_endx | params->mask->ssc_endbuf);
|
||
|
|
ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
|
||
|
|
params->mask->pdc_enable);
|
||
|
|
|
||
|
|
pr_debug("sr=%u imr=%u\n",
|
||
|
|
ssc_readx(params->ssc->regs, SSC_SR),
|
||
|
|
ssc_readx(params->ssc->regs, SSC_IER));
|
||
|
|
break; /* SNDRV_PCM_TRIGGER_START */
|
||
|
|
|
||
|
|
case SNDRV_PCM_TRIGGER_STOP:
|
||
|
|
case SNDRV_PCM_TRIGGER_SUSPEND:
|
||
|
|
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
|
||
|
|
ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
|
||
|
|
params->mask->pdc_disable);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case SNDRV_PCM_TRIGGER_RESUME:
|
||
|
|
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
|
||
|
|
ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
|
||
|
|
params->mask->pdc_enable);
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
ret = -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static snd_pcm_uframes_t atmel_pcm_pointer(
|
||
|
|
struct snd_pcm_substream *substream)
|
||
|
|
{
|
||
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
||
|
|
struct atmel_runtime_data *prtd = runtime->private_data;
|
||
|
|
struct atmel_pcm_dma_params *params = prtd->params;
|
||
|
|
dma_addr_t ptr;
|
||
|
|
snd_pcm_uframes_t x;
|
||
|
|
|
||
|
|
ptr = (dma_addr_t) ssc_readx(params->ssc->regs, params->pdc->xpr);
|
||
|
|
x = bytes_to_frames(runtime, ptr - prtd->dma_buffer);
|
||
|
|
|
||
|
|
if (x == runtime->buffer_size)
|
||
|
|
x = 0;
|
||
|
|
|
||
|
|
return x;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int atmel_pcm_open(struct snd_pcm_substream *substream)
|
||
|
|
{
|
||
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
||
|
|
struct atmel_runtime_data *prtd;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
snd_soc_set_runtime_hwparams(substream, &atmel_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 atmel_runtime_data), GFP_KERNEL);
|
||
|
|
if (prtd == NULL) {
|
||
|
|
ret = -ENOMEM;
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
runtime->private_data = prtd;
|
||
|
|
|
||
|
|
out:
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int atmel_pcm_close(struct snd_pcm_substream *substream)
|
||
|
|
{
|
||
|
|
struct atmel_runtime_data *prtd = substream->runtime->private_data;
|
||
|
|
|
||
|
|
kfree(prtd);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct snd_pcm_ops atmel_pcm_ops = {
|
||
|
|
.open = atmel_pcm_open,
|
||
|
|
.close = atmel_pcm_close,
|
||
|
|
.ioctl = snd_pcm_lib_ioctl,
|
||
|
|
.hw_params = atmel_pcm_hw_params,
|
||
|
|
.hw_free = atmel_pcm_hw_free,
|
||
|
|
.prepare = atmel_pcm_prepare,
|
||
|
|
.trigger = atmel_pcm_trigger,
|
||
|
|
.pointer = atmel_pcm_pointer,
|
||
|
|
.mmap = atmel_pcm_mmap,
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct snd_soc_platform_driver atmel_soc_platform = {
|
||
|
|
.ops = &atmel_pcm_ops,
|
||
|
|
.pcm_new = atmel_pcm_new,
|
||
|
|
.pcm_free = atmel_pcm_free,
|
||
|
|
};
|
||
|
|
|
||
|
|
int atmel_pcm_pdc_platform_register(struct device *dev)
|
||
|
|
{
|
||
|
|
return snd_soc_register_platform(dev, &atmel_soc_platform);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(atmel_pcm_pdc_platform_register);
|
||
|
|
|
||
|
|
void atmel_pcm_pdc_platform_unregister(struct device *dev)
|
||
|
|
{
|
||
|
|
snd_soc_unregister_platform(dev);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(atmel_pcm_pdc_platform_unregister);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
|
||
|
|
MODULE_DESCRIPTION("Atmel PCM module");
|
||
|
|
MODULE_LICENSE("GPL");
|