[ALSA] ASoC AT91RM92000 audio DMA
This patch adds ASoC audio DMA support to the Atmel AT91RM9200 CPU. Features:- o Playback/Capture supported. o 16 Bit data size. Signed-off-by: Frank Mandarino <fmandarino@endrelia.com> Signed-off-by: Liam Girdwood <liam.girdwood@wolfsonmicro.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
parent
7f137ab673
commit
ff9abf5b0a
|
@ -0,0 +1,428 @@
|
|||
/*
|
||||
* at91rm9200-pcm.c -- ALSA PCM interface for the Atmel AT91RM9200 chip.
|
||||
*
|
||||
* 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 <sound/driver.h>
|
||||
#include <sound/core.h>
|
||||
#include <sound/pcm.h>
|
||||
#include <sound/pcm_params.h>
|
||||
#include <sound/soc.h>
|
||||
|
||||
#include <asm/arch/at91rm9200.h>
|
||||
#include <asm/arch/at91rm9200_ssc.h>
|
||||
#include <asm/arch/at91rm9200_pdc.h>
|
||||
#include <asm/arch/hardware.h>
|
||||
|
||||
#include "at91rm9200-pcm.h"
|
||||
|
||||
#if 0
|
||||
#define DBG(x...) printk(KERN_INFO "at91rm9200-pcm: " x)
|
||||
#else
|
||||
#define DBG(x...)
|
||||
#endif
|
||||
|
||||
static const snd_pcm_hardware_t at91rm9200_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 at91rm9200_runtime_data {
|
||||
at91rm9200_pcm_dma_params_t *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 at91rm9200_pcm_dma_irq(u32 ssc_sr,
|
||||
struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct at91rm9200_runtime_data *prtd = substream->runtime->private_data;
|
||||
at91rm9200_pcm_dma_params_t *params = prtd->params;
|
||||
static int count = 0;
|
||||
|
||||
count++;
|
||||
|
||||
if (ssc_sr & params->mask->ssc_endbuf) {
|
||||
|
||||
printk(KERN_WARNING
|
||||
"at91rm9200-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->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->pdc->xpr, prtd->period_ptr);
|
||||
at91_ssc_write(params->pdc->xcr,
|
||||
prtd->period_size / params->pdc_xfer_size);
|
||||
|
||||
at91_ssc_write(params->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->pdc->xnpr, prtd->period_ptr);
|
||||
at91_ssc_write(params->pdc->xncr,
|
||||
prtd->period_size / params->pdc_xfer_size);
|
||||
}
|
||||
|
||||
snd_pcm_period_elapsed(substream);
|
||||
}
|
||||
|
||||
static int at91rm9200_pcm_hw_params(struct snd_pcm_substream *substream,
|
||||
struct snd_pcm_hw_params *params)
|
||||
{
|
||||
snd_pcm_runtime_t *runtime = substream->runtime;
|
||||
struct at91rm9200_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->cpu_dai->dma_data;
|
||||
prtd->params->dma_intr_handler = at91rm9200_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 at91rm9200_pcm_hw_free(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct at91rm9200_runtime_data *prtd = substream->runtime->private_data;
|
||||
at91rm9200_pcm_dma_params_t *params = prtd->params;
|
||||
|
||||
if (params != NULL) {
|
||||
at91_ssc_write(params->pdc->ptcr, params->mask->pdc_disable);
|
||||
prtd->params->dma_intr_handler = NULL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int at91rm9200_pcm_prepare(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct at91rm9200_runtime_data *prtd = substream->runtime->private_data;
|
||||
at91rm9200_pcm_dma_params_t *params = prtd->params;
|
||||
|
||||
at91_ssc_write(params->ssc->idr,
|
||||
params->mask->ssc_endx | params->mask->ssc_endbuf);
|
||||
|
||||
at91_ssc_write(params->pdc->ptcr, params->mask->pdc_disable);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int at91rm9200_pcm_trigger(struct snd_pcm_substream *substream,
|
||||
int cmd)
|
||||
{
|
||||
struct at91rm9200_runtime_data *prtd = substream->runtime->private_data;
|
||||
at91rm9200_pcm_dma_params_t *params = prtd->params;
|
||||
int ret = 0;
|
||||
|
||||
switch (cmd) {
|
||||
case SNDRV_PCM_TRIGGER_START:
|
||||
prtd->period_ptr = prtd->dma_buffer;
|
||||
|
||||
at91_ssc_write(params->pdc->xpr, prtd->period_ptr);
|
||||
at91_ssc_write(params->pdc->xcr,
|
||||
prtd->period_size / params->pdc_xfer_size);
|
||||
|
||||
prtd->period_ptr += prtd->period_size;
|
||||
at91_ssc_write(params->pdc->xnpr, prtd->period_ptr);
|
||||
at91_ssc_write(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->pdc->xpr),
|
||||
at91_ssc_read(params->pdc->xcr),
|
||||
at91_ssc_read(params->pdc->xnpr),
|
||||
at91_ssc_read(params->pdc->xncr));
|
||||
|
||||
at91_ssc_write(params->ssc->ier,
|
||||
params->mask->ssc_endx | params->mask->ssc_endbuf);
|
||||
|
||||
at91_ssc_write(params->pdc->ptcr, params->mask->pdc_enable);
|
||||
|
||||
DBG("sr=%lx imr=%lx\n", at91_ssc_read(params->ssc->ier - 4),
|
||||
at91_ssc_read(params->ssc->ier + 8));
|
||||
break;
|
||||
|
||||
case SNDRV_PCM_TRIGGER_STOP:
|
||||
case SNDRV_PCM_TRIGGER_SUSPEND:
|
||||
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
|
||||
at91_ssc_write(params->pdc->ptcr, params->mask->pdc_disable);
|
||||
break;
|
||||
|
||||
case SNDRV_PCM_TRIGGER_RESUME:
|
||||
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
|
||||
at91_ssc_write(params->pdc->ptcr, params->mask->pdc_enable);
|
||||
break;
|
||||
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static snd_pcm_uframes_t at91rm9200_pcm_pointer(
|
||||
struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
struct at91rm9200_runtime_data *prtd = runtime->private_data;
|
||||
at91rm9200_pcm_dma_params_t *params = prtd->params;
|
||||
dma_addr_t ptr;
|
||||
snd_pcm_uframes_t x;
|
||||
|
||||
ptr = (dma_addr_t) at91_ssc_read(params->pdc->xpr);
|
||||
x = bytes_to_frames(runtime, ptr - prtd->dma_buffer);
|
||||
|
||||
if (x == runtime->buffer_size)
|
||||
x = 0;
|
||||
return x;
|
||||
}
|
||||
|
||||
static int at91rm9200_pcm_open(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
struct at91rm9200_runtime_data *prtd;
|
||||
int ret = 0;
|
||||
|
||||
snd_soc_set_runtime_hwparams(substream, &at91rm9200_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 at91rm9200_runtime_data), GFP_KERNEL);
|
||||
if (prtd == NULL) {
|
||||
ret = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
runtime->private_data = prtd;
|
||||
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int at91rm9200_pcm_close(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct at91rm9200_runtime_data *prtd = substream->runtime->private_data;
|
||||
|
||||
kfree(prtd);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int at91rm9200_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 at91rm9200_pcm_ops = {
|
||||
.open = at91rm9200_pcm_open,
|
||||
.close = at91rm9200_pcm_close,
|
||||
.ioctl = snd_pcm_lib_ioctl,
|
||||
.hw_params = at91rm9200_pcm_hw_params,
|
||||
.hw_free = at91rm9200_pcm_hw_free,
|
||||
.prepare = at91rm9200_pcm_prepare,
|
||||
.trigger = at91rm9200_pcm_trigger,
|
||||
.pointer = at91rm9200_pcm_pointer,
|
||||
.mmap = at91rm9200_pcm_mmap,
|
||||
};
|
||||
|
||||
static int at91rm9200_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 = at91rm9200_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 at91rm9200_pcm_dmamask = 0xffffffff;
|
||||
|
||||
static int at91rm9200_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 = &at91rm9200_pcm_dmamask;
|
||||
if (!card->dev->coherent_dma_mask)
|
||||
card->dev->coherent_dma_mask = 0xffffffff;
|
||||
|
||||
if (dai->playback.channels_min) {
|
||||
ret = at91rm9200_pcm_preallocate_dma_buffer(pcm,
|
||||
SNDRV_PCM_STREAM_PLAYBACK);
|
||||
if (ret)
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (dai->capture.channels_min) {
|
||||
ret = at91rm9200_pcm_preallocate_dma_buffer(pcm,
|
||||
SNDRV_PCM_STREAM_CAPTURE);
|
||||
if (ret)
|
||||
goto out;
|
||||
}
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void at91rm9200_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;
|
||||
}
|
||||
}
|
||||
|
||||
static int at91rm9200_pcm_suspend(struct platform_device *pdev,
|
||||
struct snd_soc_cpu_dai *dai)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = dai->runtime;
|
||||
struct at91rm9200_runtime_data *prtd;
|
||||
at91rm9200_pcm_dma_params_t *params;
|
||||
|
||||
if (!runtime)
|
||||
return 0;
|
||||
|
||||
prtd = runtime->private_data;
|
||||
params = prtd->params;
|
||||
|
||||
/* disable the PDC and save the PDC registers */
|
||||
|
||||
at91_ssc_write(params->pdc->ptcr, params->mask->pdc_disable);
|
||||
|
||||
prtd->pdc_xpr_save = at91_ssc_read(params->pdc->xpr);
|
||||
prtd->pdc_xcr_save = at91_ssc_read(params->pdc->xcr);
|
||||
prtd->pdc_xnpr_save = at91_ssc_read(params->pdc->xnpr);
|
||||
prtd->pdc_xncr_save = at91_ssc_read(params->pdc->xncr);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int at91rm9200_pcm_resume(struct platform_device *pdev,
|
||||
struct snd_soc_cpu_dai *dai)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = dai->runtime;
|
||||
struct at91rm9200_runtime_data *prtd;
|
||||
at91rm9200_pcm_dma_params_t *params;
|
||||
|
||||
if (!runtime)
|
||||
return 0;
|
||||
|
||||
prtd = runtime->private_data;
|
||||
params = prtd->params;
|
||||
|
||||
/* restore the PDC registers and enable the PDC */
|
||||
at91_ssc_write(params->pdc->xpr, prtd->pdc_xpr_save);
|
||||
at91_ssc_write(params->pdc->xcr, prtd->pdc_xcr_save);
|
||||
at91_ssc_write(params->pdc->xnpr, prtd->pdc_xnpr_save);
|
||||
at91_ssc_write(params->pdc->xncr, prtd->pdc_xncr_save);
|
||||
|
||||
at91_ssc_write(params->pdc->ptcr, params->mask->pdc_enable);
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct snd_soc_platform at91rm9200_soc_platform = {
|
||||
.name = "at91rm9200-audio",
|
||||
.pcm_ops = &at91rm9200_pcm_ops,
|
||||
.pcm_new = at91rm9200_pcm_new,
|
||||
.pcm_free = at91rm9200_pcm_free_dma_buffers,
|
||||
.suspend = at91rm9200_pcm_suspend,
|
||||
.resume = at91rm9200_pcm_resume,
|
||||
};
|
||||
|
||||
EXPORT_SYMBOL_GPL(at91rm9200_soc_platform);
|
||||
|
||||
MODULE_AUTHOR("Frank Mandarino <fmandarino@endrelia.com>");
|
||||
MODULE_DESCRIPTION("Atmel AT91RM9200 PCM module");
|
||||
MODULE_LICENSE("GPL");
|
|
@ -0,0 +1,75 @@
|
|||
/*
|
||||
* at91rm9200-pcm.h - ALSA PCM interface for the Atmel AT91RM9200 chip
|
||||
*
|
||||
* Author: Frank Mandarino <fmandarino@endrelia.com>
|
||||
* Endrelia Technologies Inc.
|
||||
* Created: Mar 3, 2006
|
||||
*
|
||||
* Based on pxa2xx-pcm.h by:
|
||||
*
|
||||
* Author: Nicolas Pitre
|
||||
* Created: Nov 30, 2004
|
||||
* Copyright: 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.
|
||||
*/
|
||||
|
||||
/*
|
||||
* Registers and status bits that are required by the PCM driver.
|
||||
*/
|
||||
struct at91rm9200_ssc_regs {
|
||||
void __iomem *cr; /* SSC control */
|
||||
void __iomem *ier; /* SSC interrupt enable */
|
||||
void __iomem *idr; /* SSC interrupt disable */
|
||||
};
|
||||
|
||||
struct at91rm9200_pdc_regs {
|
||||
void __iomem *xpr; /* PDC recv/trans pointer */
|
||||
void __iomem *xcr; /* PDC recv/trans counter */
|
||||
void __iomem *xnpr; /* PDC next recv/trans pointer */
|
||||
void __iomem *xncr; /* PDC next recv/trans counter */
|
||||
void __iomem *ptcr; /* PDC transfer control */
|
||||
};
|
||||
|
||||
struct at91rm9200_ssc_mask {
|
||||
u32 ssc_enable; /* SSC recv/trans enable */
|
||||
u32 ssc_disable; /* SSC recv/trans disable */
|
||||
u32 ssc_endx; /* SSC ENDTX or ENDRX */
|
||||
u32 ssc_endbuf; /* SSC TXBUFE or RXBUFF */
|
||||
u32 pdc_enable; /* PDC recv/trans enable */
|
||||
u32 pdc_disable; /* PDC recv/trans disable */
|
||||
};
|
||||
|
||||
|
||||
/*
|
||||
* This structure, shared between the PCM driver and the interface,
|
||||
* contains all information required by the PCM driver to perform the
|
||||
* PDC DMA operation. All fields except dma_intr_handler() are initialized
|
||||
* by the interface. The dms_intr_handler() pointer is set by the PCM
|
||||
* driver and called by the interface SSC interrupt handler if it is
|
||||
* non-NULL.
|
||||
*/
|
||||
typedef struct {
|
||||
char *name; /* stream identifier */
|
||||
int pdc_xfer_size; /* PDC counter increment in bytes */
|
||||
struct at91rm9200_ssc_regs *ssc; /* SSC register addresses */
|
||||
struct at91rm9200_pdc_regs *pdc; /* PDC receive/transmit registers */
|
||||
struct at91rm9200_ssc_mask *mask;/* SSC & PDC status bits */
|
||||
snd_pcm_substream_t *substream;
|
||||
void (*dma_intr_handler)(u32, snd_pcm_substream_t *);
|
||||
} at91rm9200_pcm_dma_params_t;
|
||||
|
||||
extern struct snd_soc_cpu_dai at91rm9200_i2s_dai[3];
|
||||
extern struct snd_soc_platform at91rm9200_soc_platform;
|
||||
|
||||
|
||||
/*
|
||||
* SSC I/O helpers.
|
||||
* E.g., at91_ssc_write(AT91_SSC(1) + AT91_SSC_CR, AT91_SSC_RXEN);
|
||||
*/
|
||||
#define AT91_SSC(x) (((x)==0) ? AT91_VA_BASE_SSC0 :\
|
||||
((x)==1) ? AT91_VA_BASE_SSC1 : ((x)==2) ? AT91_VA_BASE_SSC2 : NULL)
|
||||
#define at91_ssc_read(a) ((unsigned long) __raw_readl(a))
|
||||
#define at91_ssc_write(a,v) __raw_writel((v),(a))
|
Loading…
Reference in New Issue