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/*
* ALSA SoC SPDIF In Audio Layer for spear processors
*
* Copyright (C) 2012 ST Microelectronics
* Vipin Kumar <vipin.kumar@st.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/spear_dma.h>
#include <sound/spear_spdif.h>
#include "spdif_in_regs.h"
#include "spear_pcm.h"
struct spdif_in_params {
u32 format;
};
struct spdif_in_dev {
struct clk *clk;
struct spear_dma_data dma_params;
struct spdif_in_params saved_params;
void *io_base;
struct device *dev;
void (*reset_perip)(void);
int irq;
struct snd_dmaengine_dai_dma_data dma_params_rx;
struct snd_dmaengine_pcm_config config;
};
static void spdif_in_configure(struct spdif_in_dev *host)
{
u32 ctrl = SPDIF_IN_PRTYEN | SPDIF_IN_STATEN | SPDIF_IN_USREN |
SPDIF_IN_VALEN | SPDIF_IN_BLKEN;
ctrl |= SPDIF_MODE_16BIT | SPDIF_FIFO_THRES_16;
writel(ctrl, host->io_base + SPDIF_IN_CTRL);
writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK);
}
static int spdif_in_dai_probe(struct snd_soc_dai *dai)
{
struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
host->dma_params_rx.filter_data = &host->dma_params;
dai->capture_dma_data = &host->dma_params_rx;
return 0;
}
static void spdif_in_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
return;
writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK);
}
static void spdif_in_format(struct spdif_in_dev *host, u32 format)
{
u32 ctrl = readl(host->io_base + SPDIF_IN_CTRL);
switch (format) {
case SNDRV_PCM_FORMAT_S16_LE:
ctrl |= SPDIF_XTRACT_16BIT;
break;
case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE:
ctrl &= ~SPDIF_XTRACT_16BIT;
break;
}
writel(ctrl, host->io_base + SPDIF_IN_CTRL);
}
static int spdif_in_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
u32 format;
if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
return -EINVAL;
format = params_format(params);
host->saved_params.format = format;
return 0;
}
static int spdif_in_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
u32 ctrl;
int ret = 0;
if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
return -EINVAL;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
clk_enable(host->clk);
spdif_in_configure(host);
spdif_in_format(host, host->saved_params.format);
ctrl = readl(host->io_base + SPDIF_IN_CTRL);
ctrl |= SPDIF_IN_SAMPLE | SPDIF_IN_ENB;
writel(ctrl, host->io_base + SPDIF_IN_CTRL);
writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
ctrl = readl(host->io_base + SPDIF_IN_CTRL);
ctrl &= ~(SPDIF_IN_SAMPLE | SPDIF_IN_ENB);
writel(ctrl, host->io_base + SPDIF_IN_CTRL);
writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK);
if (host->reset_perip)
host->reset_perip();
clk_disable(host->clk);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static const struct snd_soc_dai_ops spdif_in_dai_ops = {
.shutdown = spdif_in_shutdown,
.trigger = spdif_in_trigger,
.hw_params = spdif_in_hw_params,
};
static struct snd_soc_dai_driver spdif_in_dai = {
.probe = spdif_in_dai_probe,
.capture = {
.channels_min = 2,
.channels_max = 2,
.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \
SNDRV_PCM_RATE_192000),
.formats = SNDRV_PCM_FMTBIT_S16_LE | \
SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE,
},
.ops = &spdif_in_dai_ops,
};
static const struct snd_soc_component_driver spdif_in_component = {
.name = "spdif-in",
};
static irqreturn_t spdif_in_irq(int irq, void *arg)
{
struct spdif_in_dev *host = (struct spdif_in_dev *)arg;
u32 irq_status = readl(host->io_base + SPDIF_IN_IRQ);
if (!irq_status)
return IRQ_NONE;
if (irq_status & SPDIF_IRQ_FIFOWRITE)
dev_err(host->dev, "spdif in: fifo write error");
if (irq_status & SPDIF_IRQ_EMPTYFIFOREAD)
dev_err(host->dev, "spdif in: empty fifo read error");
if (irq_status & SPDIF_IRQ_FIFOFULL)
dev_err(host->dev, "spdif in: fifo full error");
if (irq_status & SPDIF_IRQ_OUTOFRANGE)
dev_err(host->dev, "spdif in: out of range error");
writel(0, host->io_base + SPDIF_IN_IRQ);
return IRQ_HANDLED;
}
static int spdif_in_probe(struct platform_device *pdev)
{
struct spdif_in_dev *host;
struct spear_spdif_platform_data *pdata;
struct resource *res_fifo;
void __iomem *io_base;
int ret;
io_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(io_base))
return PTR_ERR(io_base);
res_fifo = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (!res_fifo)
return -EINVAL;
host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
if (!host)
return -ENOMEM;
host->io_base = io_base;
host->irq = platform_get_irq(pdev, 0);
if (host->irq < 0) {
dev_warn(&pdev->dev, "failed to get IRQ: %d\n", host->irq);
return host->irq;
}
host->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(host->clk))
return PTR_ERR(host->clk);
pdata = dev_get_platdata(&pdev->dev);
if (!pdata)
return -EINVAL;
host->dma_params.data = pdata->dma_params;
host->dma_params.addr = res_fifo->start;
host->dma_params.max_burst = 16;
host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
host->reset_perip = pdata->reset_perip;
host->dev = &pdev->dev;
dev_set_drvdata(&pdev->dev, host);
ret = devm_request_irq(&pdev->dev, host->irq, spdif_in_irq, 0,
"spdif-in", host);
if (ret) {
dev_warn(&pdev->dev, "request_irq failed\n");
return ret;
}
ret = devm_snd_soc_register_component(&pdev->dev, &spdif_in_component,
&spdif_in_dai, 1);
if (ret)
return ret;
return devm_spear_pcm_platform_register(&pdev->dev, &host->config,
pdata->filter);
}
static struct platform_driver spdif_in_driver = {
.probe = spdif_in_probe,
.driver = {
.name = "spdif-in",
},
};
module_platform_driver(spdif_in_driver);
MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
MODULE_DESCRIPTION("SPEAr SPDIF IN SoC Interface");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:spdif_in");
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