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linux-next/sound/soc/atmel/atmel-pcm.c
Liam Girdwood f0fba2ad1b ASoC: multi-component - ASoC Multi-Component Support 
This patch extends the ASoC API to allow sound cards to have more than one
CODEC and more than one platform DMA controller. This is achieved by dividing
some current ASoC structures that contain both driver data and device data into
structures that only either contain device data or driver data. i.e.

 struct snd_soc_codec    --->  struct snd_soc_codec (device data)
                          +->  struct snd_soc_codec_driver (driver data)

 struct snd_soc_platform --->  struct snd_soc_platform (device data)
                          +->  struct snd_soc_platform_driver (driver data)

 struct snd_soc_dai      --->  struct snd_soc_dai (device data)
                          +->  struct snd_soc_dai_driver (driver data)

 struct snd_soc_device   --->  deleted

This now allows ASoC to be more tightly aligned with the Linux driver model and
also means that every ASoC codec, platform and (platform) DAI is a kernel
device. ASoC component private data is now stored as device private data.

The ASoC sound card struct snd_soc_card has also been updated to store lists
of it's components rather than a pointer to a codec and platform. The PCM
runtime struct soc_pcm_runtime now has pointers to all its components.

This patch adds DAPM support for ASoC multi-component and removes struct
snd_soc_socdev from DAPM core. All DAPM calls are now made on a card, codec
or runtime PCM level basis rather than using snd_soc_socdev.

Other notable multi-component changes:-

 * Stream operations now de-reference less structures.
 * close_delayed work() now runs on a DAI basis rather than looping all DAIs
   in a card.
 * PM suspend()/resume() operations can now handle N CODECs and Platforms
   per sound card.
 * Added soc_bind_dai_link() to bind the component devices to the sound card.
 * Added soc_dai_link_probe() and soc_dai_link_remove() to probe and remove
   DAI link components.
 * sysfs entries can now be registered per component per card.
 * snd_soc_new_pcms() functionailty rolled into dai_link_probe().
 * snd_soc_register_codec() now does all the codec list and mutex init.

This patch changes the probe() and remove() of the CODEC drivers as follows:-

 o Make CODEC driver a platform driver
 o Moved all struct snd_soc_codec list, mutex, etc initialiasation to core.
 o Removed all static codec pointers (drivers now support > 1 codec dev)
 o snd_soc_register_pcms() now done by core.
 o snd_soc_register_dai() folded into snd_soc_register_codec().

CS4270 portions:
Acked-by: Timur Tabi <timur@freescale.com>

Some TLV320aic23 and Cirrus platform fixes.
Signed-off-by: Ryan Mallon <ryan@bluewatersys.com>

TI CODEC and OMAP fixes
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Signed-off-by: Jarkko Nikula <jhnikula@gmail.com>

Samsung platform and misc fixes :-
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Jassi Brar <jassi.brar@samsung.com>
Signed-off-by: Seungwhan Youn <sw.youn@samsung.com>

MPC8610 and PPC fixes.
Signed-off-by: Timur Tabi <timur@freescale.com>

i.MX fixes and some core fixes.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

J4740 platform fixes:-
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>

CC: Tony Lindgren <tony@atomide.com>
CC: Nicolas Ferre <nicolas.ferre@atmel.com>
CC: Kevin Hilman <khilman@deeprootsystems.com>
CC: Sascha Hauer <s.hauer@pengutronix.de>
CC: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
CC: Kuninori Morimoto <morimoto.kuninori@renesas.com>
CC: Daniel Gloeckner <dg@emlix.com>
CC: Manuel Lauss <mano@roarinelk.homelinux.net>
CC: Mike Frysinger <vapier.adi@gmail.com>
CC: Arnaud Patard <apatard@mandriva.com>
CC: Wan ZongShun <mcuos.com@gmail.com>

Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
2010-08-12 14:00:00 +01:00

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/*
* 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"
/*--------------------------------------------------------------------------*\
* 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,
.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,
};
/*--------------------------------------------------------------------------*\
* 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 */
/* PDC register save */
u32 pdc_xpr_save;
u32 pdc_xcr_save;
u32 pdc_xnpr_save;
u32 pdc_xncr_save;
};
/*--------------------------------------------------------------------------*\
* Helper functions
\*--------------------------------------------------------------------------*/
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_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_coherent(pcm->card->dev, size,
&buf->addr, GFP_KERNEL);
pr_debug("atmel-pcm:"
"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;
}
/*--------------------------------------------------------------------------*\
* 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_warning("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=%u, period_size=%u)\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 = %u\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 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 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,
};
/*--------------------------------------------------------------------------*\
* ASoC platform driver
\*--------------------------------------------------------------------------*/
static u64 atmel_pcm_dmamask = 0xffffffff;
static int atmel_pcm_new(struct snd_card *card,
struct snd_soc_dai *dai, struct snd_pcm *pcm)
{
int ret = 0;
if (!card->dev->dma_mask)
card->dev->dma_mask = &atmel_pcm_dmamask;
if (!card->dev->coherent_dma_mask)
card->dev->coherent_dma_mask = 0xffffffff;
if (dai->driver->playback.channels_min) {
ret = atmel_pcm_preallocate_dma_buffer(pcm,
SNDRV_PCM_STREAM_PLAYBACK);
if (ret)
goto out;
}
if (dai->driver->capture.channels_min) {
pr_debug("at32-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_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_coherent(pcm->card->dev, buf->bytes,
buf->area, buf->addr);
buf->area = NULL;
}
}
#ifdef CONFIG_PM
static int atmel_pcm_suspend(struct snd_soc_dai *dai)
{
struct snd_pcm_runtime *runtime = dai->runtime;
struct atmel_runtime_data *prtd;
struct atmel_pcm_dma_params *params;
if (!runtime)
return 0;
prtd = runtime->private_data;
params = prtd->params;
/* disable the PDC and save the PDC registers */
ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_disable);
prtd->pdc_xpr_save = ssc_readx(params->ssc->regs, params->pdc->xpr);
prtd->pdc_xcr_save = ssc_readx(params->ssc->regs, params->pdc->xcr);
prtd->pdc_xnpr_save = ssc_readx(params->ssc->regs, params->pdc->xnpr);
prtd->pdc_xncr_save = ssc_readx(params->ssc->regs, params->pdc->xncr);
return 0;
}
static int atmel_pcm_resume(struct snd_soc_dai *dai)
{
struct snd_pcm_runtime *runtime = dai->runtime;
struct atmel_runtime_data *prtd;
struct atmel_pcm_dma_params *params;
if (!runtime)
return 0;
prtd = runtime->private_data;
params = prtd->params;
/* restore the PDC registers and enable the PDC */
ssc_writex(params->ssc->regs, params->pdc->xpr, prtd->pdc_xpr_save);
ssc_writex(params->ssc->regs, params->pdc->xcr, prtd->pdc_xcr_save);
ssc_writex(params->ssc->regs, params->pdc->xnpr, prtd->pdc_xnpr_save);
ssc_writex(params->ssc->regs, params->pdc->xncr, prtd->pdc_xncr_save);
ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_enable);
return 0;
}
#else
#define atmel_pcm_suspend NULL
#define atmel_pcm_resume NULL
#endif
static struct snd_soc_platform_driver atmel_soc_platform = {
.ops = &atmel_pcm_ops,
.pcm_new = atmel_pcm_new,
.pcm_free = atmel_pcm_free_dma_buffers,
.suspend = atmel_pcm_suspend,
.resume = atmel_pcm_resume,
};
static int __devinit atmel_soc_platform_probe(struct platform_device *pdev)
{
return snd_soc_register_platform(&pdev->dev, &atmel_soc_platform);
}
static int __devexit atmel_soc_platform_remove(struct platform_device *pdev)
{
snd_soc_unregister_platform(&pdev->dev);
return 0;
}
static struct platform_driver atmel_pcm_driver = {
.driver = {
.name = "atmel-pcm-audio",
.owner = THIS_MODULE,
},
.probe = atmel_soc_platform_probe,
.remove = __devexit_p(atmel_soc_platform_remove),
};
static int __init snd_atmel_pcm_init(void)
{
return platform_driver_register(&atmel_pcm_driver);
}
module_init(snd_atmel_pcm_init);
static void __exit snd_atmel_pcm_exit(void)
{
platform_driver_unregister(&atmel_pcm_driver);
}
module_exit(snd_atmel_pcm_exit);
MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
MODULE_DESCRIPTION("Atmel PCM module");
MODULE_LICENSE("GPL");
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