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/*
* SiRF Audio port driver
*
* Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
*
* Licensed under GPLv2 or later.
*/
#include <linux/module.h>
#include <linux/io.h>
#include <linux/regmap.h>
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>
#include "sirf-audio-port.h"
struct sirf_audio_port {
struct regmap *regmap;
struct snd_dmaengine_dai_dma_data playback_dma_data;
struct snd_dmaengine_dai_dma_data capture_dma_data;
};
static void sirf_audio_port_tx_enable(struct sirf_audio_port *port)
{
regmap_update_bits(port->regmap, AUDIO_PORT_IC_TXFIFO_OP,
AUDIO_FIFO_RESET, AUDIO_FIFO_RESET);
regmap_write(port->regmap, AUDIO_PORT_IC_TXFIFO_INT_MSK, 0);
regmap_write(port->regmap, AUDIO_PORT_IC_TXFIFO_OP, 0);
regmap_update_bits(port->regmap, AUDIO_PORT_IC_TXFIFO_OP,
AUDIO_FIFO_START, AUDIO_FIFO_START);
regmap_update_bits(port->regmap, AUDIO_PORT_IC_CODEC_TX_CTRL,
IC_TX_ENABLE, IC_TX_ENABLE);
}
static void sirf_audio_port_tx_disable(struct sirf_audio_port *port)
{
regmap_write(port->regmap, AUDIO_PORT_IC_TXFIFO_OP, 0);
regmap_update_bits(port->regmap, AUDIO_PORT_IC_CODEC_TX_CTRL,
IC_TX_ENABLE, ~IC_TX_ENABLE);
}
static void sirf_audio_port_rx_enable(struct sirf_audio_port *port,
int channels)
{
regmap_update_bits(port->regmap, AUDIO_PORT_IC_RXFIFO_OP,
AUDIO_FIFO_RESET, AUDIO_FIFO_RESET);
regmap_write(port->regmap, AUDIO_PORT_IC_RXFIFO_INT_MSK, 0);
regmap_write(port->regmap, AUDIO_PORT_IC_RXFIFO_OP, 0);
regmap_update_bits(port->regmap, AUDIO_PORT_IC_RXFIFO_OP,
AUDIO_FIFO_START, AUDIO_FIFO_START);
if (channels == 1)
regmap_update_bits(port->regmap, AUDIO_PORT_IC_CODEC_RX_CTRL,
IC_RX_ENABLE_MONO, IC_RX_ENABLE_MONO);
else
regmap_update_bits(port->regmap, AUDIO_PORT_IC_CODEC_RX_CTRL,
IC_RX_ENABLE_STEREO, IC_RX_ENABLE_STEREO);
}
static void sirf_audio_port_rx_disable(struct sirf_audio_port *port)
{
regmap_update_bits(port->regmap, AUDIO_PORT_IC_CODEC_RX_CTRL,
IC_RX_ENABLE_STEREO, ~IC_RX_ENABLE_STEREO);
}
static int sirf_audio_port_dai_probe(struct snd_soc_dai *dai)
{
struct sirf_audio_port *port = snd_soc_dai_get_drvdata(dai);
snd_soc_dai_init_dma_data(dai, &port->playback_dma_data,
&port->capture_dma_data);
return 0;
}
static int sirf_audio_port_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct sirf_audio_port *port = snd_soc_dai_get_drvdata(dai);
int playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
switch (cmd) {
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
if (playback)
sirf_audio_port_tx_disable(port);
else
sirf_audio_port_rx_disable(port);
break;
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
if (playback)
sirf_audio_port_tx_enable(port);
else
sirf_audio_port_rx_enable(port,
substream->runtime->channels);
break;
default:
return -EINVAL;
}
return 0;
}
static const struct snd_soc_dai_ops sirf_audio_port_dai_ops = {
.trigger = sirf_audio_port_trigger,
};
static struct snd_soc_dai_driver sirf_audio_port_dai = {
.probe = sirf_audio_port_dai_probe,
.name = "sirf-audio-port",
.id = 0,
.playback = {
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_48000,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
},
.capture = {
.channels_min = 1,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_48000,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
},
.ops = &sirf_audio_port_dai_ops,
};
static const struct snd_soc_component_driver sirf_audio_port_component = {
.name = "sirf-audio-port",
};
static const struct regmap_config sirf_audio_port_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = AUDIO_PORT_IC_RXFIFO_INT_MSK,
.cache_type = REGCACHE_NONE,
};
static int sirf_audio_port_probe(struct platform_device *pdev)
{
int ret;
struct sirf_audio_port *port;
void __iomem *base;
struct resource *mem_res;
port = devm_kzalloc(&pdev->dev,
sizeof(struct sirf_audio_port), GFP_KERNEL);
if (!port)
return -ENOMEM;
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem_res) {
dev_err(&pdev->dev, "no mem resource?\n");
return -ENODEV;
}
base = devm_ioremap(&pdev->dev, mem_res->start,
resource_size(mem_res));
if (base == NULL)
return -ENOMEM;
port->regmap = devm_regmap_init_mmio(&pdev->dev, base,
&sirf_audio_port_regmap_config);
if (IS_ERR(port->regmap))
return PTR_ERR(port->regmap);
ret = devm_snd_soc_register_component(&pdev->dev,
&sirf_audio_port_component, &sirf_audio_port_dai, 1);
if (ret)
return ret;
platform_set_drvdata(pdev, port);
return devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
}
static const struct of_device_id sirf_audio_port_of_match[] = {
{ .compatible = "sirf,audio-port", },
{}
};
MODULE_DEVICE_TABLE(of, sirf_audio_port_of_match);
static struct platform_driver sirf_audio_port_driver = {
.driver = {
.name = "sirf-audio-port",
.owner = THIS_MODULE,
.of_match_table = sirf_audio_port_of_match,
},
.probe = sirf_audio_port_probe,
};
module_platform_driver(sirf_audio_port_driver);
MODULE_DESCRIPTION("SiRF Audio Port driver");
MODULE_AUTHOR("RongJun Ying <Rongjun.Ying@csr.com>");
MODULE_LICENSE("GPL v2");
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