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linux/sound/arm/pxa2xx-ac97.c
Takashi Iwai 7f2da3d76b ALSA: pxa2xx: Use managed PCM buffer allocation 
Now with the recent addition of WC buffer allocation support, we can
use the standard PCM buffer allocation helpers for pxa2xx drivers.
This allows us to remove lots of superfluous code.

Cc: Daniel Mack <daniel@zonque.org>
Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20210802072815.13551-6-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-08-04 08:08:21 +02:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip.
*
* Author: Nicolas Pitre
* Created: Dec 02, 2004
* Copyright: MontaVista Software Inc.
*/
#include <linux/init.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>
#include <sound/pxa2xx-lib.h>
#include <sound/dmaengine_pcm.h>
#include <mach/regs-ac97.h>
#include <mach/audio.h>
static void pxa2xx_ac97_legacy_reset(struct snd_ac97 *ac97)
{
if (!pxa2xx_ac97_try_cold_reset())
pxa2xx_ac97_try_warm_reset();
pxa2xx_ac97_finish_reset();
}
static unsigned short pxa2xx_ac97_legacy_read(struct snd_ac97 *ac97,
unsigned short reg)
{
int ret;
ret = pxa2xx_ac97_read(ac97->num, reg);
if (ret < 0)
return 0;
else
return (unsigned short)(ret & 0xffff);
}
static void pxa2xx_ac97_legacy_write(struct snd_ac97 *ac97,
unsigned short reg, unsigned short val)
{
pxa2xx_ac97_write(ac97->num, reg, val);
}
static const struct snd_ac97_bus_ops pxa2xx_ac97_ops = {
.read = pxa2xx_ac97_legacy_read,
.write = pxa2xx_ac97_legacy_write,
.reset = pxa2xx_ac97_legacy_reset,
};
static struct snd_pcm *pxa2xx_ac97_pcm;
static struct snd_ac97 *pxa2xx_ac97_ac97;
static int pxa2xx_ac97_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
pxa2xx_audio_ops_t *platform_ops;
int ret, i;
ret = pxa2xx_pcm_open(substream);
if (ret)
return ret;
runtime->hw.channels_min = 2;
runtime->hw.channels_max = 2;
i = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
AC97_RATES_FRONT_DAC : AC97_RATES_ADC;
runtime->hw.rates = pxa2xx_ac97_ac97->rates[i];
snd_pcm_limit_hw_rates(runtime);
platform_ops = substream->pcm->card->dev->platform_data;
if (platform_ops && platform_ops->startup) {
ret = platform_ops->startup(substream, platform_ops->priv);
if (ret < 0)
pxa2xx_pcm_close(substream);
}
return ret;
}
static int pxa2xx_ac97_pcm_close(struct snd_pcm_substream *substream)
{
pxa2xx_audio_ops_t *platform_ops;
platform_ops = substream->pcm->card->dev->platform_data;
if (platform_ops && platform_ops->shutdown)
platform_ops->shutdown(substream, platform_ops->priv);
return 0;
}
static int pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
int ret;
ret = pxa2xx_pcm_prepare(substream);
if (ret < 0)
return ret;
return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
}
#ifdef CONFIG_PM_SLEEP
static int pxa2xx_ac97_do_suspend(struct snd_card *card)
{
pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
snd_ac97_suspend(pxa2xx_ac97_ac97);
if (platform_ops && platform_ops->suspend)
platform_ops->suspend(platform_ops->priv);
return pxa2xx_ac97_hw_suspend();
}
static int pxa2xx_ac97_do_resume(struct snd_card *card)
{
pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
int rc;
rc = pxa2xx_ac97_hw_resume();
if (rc)
return rc;
if (platform_ops && platform_ops->resume)
platform_ops->resume(platform_ops->priv);
snd_ac97_resume(pxa2xx_ac97_ac97);
snd_power_change_state(card, SNDRV_CTL_POWER_D0);
return 0;
}
static int pxa2xx_ac97_suspend(struct device *dev)
{
struct snd_card *card = dev_get_drvdata(dev);
int ret = 0;
if (card)
ret = pxa2xx_ac97_do_suspend(card);
return ret;
}
static int pxa2xx_ac97_resume(struct device *dev)
{
struct snd_card *card = dev_get_drvdata(dev);
int ret = 0;
if (card)
ret = pxa2xx_ac97_do_resume(card);
return ret;
}
static SIMPLE_DEV_PM_OPS(pxa2xx_ac97_pm_ops, pxa2xx_ac97_suspend, pxa2xx_ac97_resume);
#endif
static const struct snd_pcm_ops pxa2xx_ac97_pcm_ops = {
.open = pxa2xx_ac97_pcm_open,
.close = pxa2xx_ac97_pcm_close,
.hw_params = pxa2xx_pcm_hw_params,
.prepare = pxa2xx_ac97_pcm_prepare,
.trigger = pxa2xx_pcm_trigger,
.pointer = pxa2xx_pcm_pointer,
};
static int pxa2xx_ac97_pcm_new(struct snd_card *card)
{
struct snd_pcm *pcm;
int ret;
ret = snd_pcm_new(card, "PXA2xx-PCM", 0, 1, 1, &pcm);
if (ret)
goto out;
ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
if (ret)
goto out;
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pxa2xx_ac97_pcm_ops);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pxa2xx_ac97_pcm_ops);
ret = pxa2xx_pcm_preallocate_dma_buffer(pcm);
if (ret)
goto out;
pxa2xx_ac97_pcm = pcm;
ret = 0;
out:
return ret;
}
static int pxa2xx_ac97_probe(struct platform_device *dev)
{
struct snd_card *card;
struct snd_ac97_bus *ac97_bus;
struct snd_ac97_template ac97_template;
int ret;
pxa2xx_audio_ops_t *pdata = dev->dev.platform_data;
if (dev->id >= 0) {
dev_err(&dev->dev, "PXA2xx has only one AC97 port.\n");
ret = -ENXIO;
goto err_dev;
}
ret = snd_card_new(&dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
THIS_MODULE, 0, &card);
if (ret < 0)
goto err;
strscpy(card->driver, dev->dev.driver->name, sizeof(card->driver));
ret = pxa2xx_ac97_pcm_new(card);
if (ret)
goto err;
ret = pxa2xx_ac97_hw_probe(dev);
if (ret)
goto err;
ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
if (ret)
goto err_remove;
memset(&ac97_template, 0, sizeof(ac97_template));
ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
if (ret)
goto err_remove;
snprintf(card->shortname, sizeof(card->shortname),
"%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
snprintf(card->longname, sizeof(card->longname),
"%s (%s)", dev->dev.driver->name, card->mixername);
if (pdata && pdata->codec_pdata[0])
snd_ac97_dev_add_pdata(ac97_bus->codec[0], pdata->codec_pdata[0]);
ret = snd_card_register(card);
if (ret == 0) {
platform_set_drvdata(dev, card);
return 0;
}
err_remove:
pxa2xx_ac97_hw_remove(dev);
err:
if (card)
snd_card_free(card);
err_dev:
return ret;
}
static int pxa2xx_ac97_remove(struct platform_device *dev)
{
struct snd_card *card = platform_get_drvdata(dev);
if (card) {
snd_card_free(card);
pxa2xx_ac97_hw_remove(dev);
}
return 0;
}
static struct platform_driver pxa2xx_ac97_driver = {
.probe = pxa2xx_ac97_probe,
.remove = pxa2xx_ac97_remove,
.driver = {
.name = "pxa2xx-ac97",
#ifdef CONFIG_PM_SLEEP
.pm = &pxa2xx_ac97_pm_ops,
#endif
},
};
module_platform_driver(pxa2xx_ac97_driver);
MODULE_AUTHOR("Nicolas Pitre");
MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pxa2xx-ac97");
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