/*
* ALSA SoC SPDIF Out Audio Layer for spear processors
*
* Copyright (C) 2012 ST Microelectronics
* Vipin Kumar <[email protected]>
*
* 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/soc.h>
#include <sound/spear_dma.h>
#include <sound/spear_spdif.h>
#include "spdif_out_regs.h"
#include "spear_pcm.h"
struct spdif_out_params {
u32 rate;
u32 core_freq;
u32 mute;
};
struct spdif_out_dev {
struct clk *clk;
struct spear_dma_data dma_params;
struct spdif_out_params saved_params;
u32 running;
void __iomem *io_base;
struct snd_dmaengine_dai_dma_data dma_params_tx;
struct snd_dmaengine_pcm_config config;
};
static void spdif_out_configure(struct spdif_out_dev *host)
{
writel(SPDIF_OUT_RESET, host->io_base + SPDIF_OUT_SOFT_RST);
mdelay(1);
writel(readl(host->io_base + SPDIF_OUT_SOFT_RST) & ~SPDIF_OUT_RESET,
host->io_base + SPDIF_OUT_SOFT_RST);
writel(SPDIF_OUT_FDMA_TRIG_16 | SPDIF_OUT_MEMFMT_16_16 |
SPDIF_OUT_VALID_HW | SPDIF_OUT_USER_HW |
SPDIF_OUT_CHNLSTA_HW | SPDIF_OUT_PARITY_HW,
host->io_base + SPDIF_OUT_CFG);
writel(0x7F, host->io_base + SPDIF_OUT_INT_STA_CLR);
writel(0x7F, host->io_base + SPDIF_OUT_INT_EN_CLR);
}
static int spdif_out_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *cpu_dai)
{
struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
int ret;
if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
return -EINVAL;
ret = clk_enable(host->clk);
if (ret)
return ret;
host->running = true;
spdif_out_configure(host);
return 0;
}
static void spdif_out_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
return;
clk_disable(host->clk);
host->running = false;
}
static void spdif_out_clock(struct spdif_out_dev *host, u32 core_freq,
u32 rate)
{
u32 divider, ctrl;
clk_set_rate(host->clk, core_freq);
divider = DIV_ROUND_CLOSEST(clk_get_rate(host->clk), (rate * 128));
ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
ctrl &= ~SPDIF_DIVIDER_MASK;
ctrl |= (divider << SPDIF_DIVIDER_SHIFT) & SPDIF_DIVIDER_MASK;
writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
}
static int spdif_out_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
u32 rate, core_freq;
if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
return -EINVAL;
rate = params_rate(params);
switch (rate) {
case 8000:
case 16000:
case 32000:
case 64000:
/*
* The clock is multiplied by 10 to bring it to feasible range
* of frequencies for sscg
*/
core_freq = 64000 * 128 * 10; /* 81.92 MHz */
break;
case 5512:
case 11025:
case 22050:
case 44100:
case 88200:
case 176400:
core_freq = 176400 * 128; /* 22.5792 MHz */
break;
case 48000:
case 96000:
case 192000:
default:
core_freq = 192000 * 128; /* 24.576 MHz */
break;
}
spdif_out_clock(host, core_freq, rate);
host->saved_params.core_freq = core_freq;
host->saved_params.rate = rate;
return 0;
}
static int spdif_out_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
u32 ctrl;
int ret = 0;
if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
return -EINVAL;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
ctrl &= ~SPDIF_OPMODE_MASK;
if (!host->saved_params.mute)
ctrl |= SPDIF_OPMODE_AUD_DATA |
SPDIF_STATE_NORMAL;
else
ctrl |= SPDIF_OPMODE_MUTE_PCM;
writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
ctrl &= ~SPDIF_OPMODE_MASK;
ctrl |= SPDIF_OPMODE_OFF;
writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int spdif_mute(struct snd_soc_dai *dai, int mute, int direction)
{
struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
u32 val;
host->saved_params.mute = mute;
val = readl(host->io_base + SPDIF_OUT_CTRL);
val &= ~SPDIF_OPMODE_MASK;
if (mute)
val |= SPDIF_OPMODE_MUTE_PCM;
else {
if (host->running)
val |= SPDIF_OPMODE_AUD_DATA | SPDIF_STATE_NORMAL;
else
val |= SPDIF_OPMODE_OFF;
}
writel(val, host->io_base + SPDIF_OUT_CTRL);
return 0;
}
static int spdif_mute_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
ucontrol->value.integer.value[0] = host->saved_params.mute;
return 0;
}
static int spdif_mute_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
if (host->saved_params.mute == ucontrol->value.integer.value[0])
return 0;
spdif_mute(cpu_dai, ucontrol->value.integer.value[0],
SNDRV_PCM_STREAM_PLAYBACK);
return 1;
}
static const struct snd_kcontrol_new spdif_out_controls[] = {
SOC_SINGLE_BOOL_EXT("IEC958 Playback Switch", 0,
spdif_mute_get, spdif_mute_put),
};
static int spdif_soc_dai_probe(struct snd_soc_dai *dai)
{
struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
host->dma_params_tx.filter_data = &host->dma_params;
snd_soc_dai_dma_data_set_playback(dai, &host->dma_params_tx);
return snd_soc_add_dai_controls(dai, spdif_out_controls,
ARRAY_SIZE(spdif_out_controls));
}
static const struct snd_soc_dai_ops spdif_out_dai_ops = {
.mute_stream = spdif_mute,
.startup = spdif_out_startup,
.shutdown = spdif_out_shutdown,
.trigger = spdif_out_trigger,
.hw_params = spdif_out_hw_params,
.no_capture_mute = 1,
};
static struct snd_soc_dai_driver spdif_out_dai = {
.playback = {
.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,
},
.probe = spdif_soc_dai_probe,
.ops = &spdif_out_dai_ops,
};
static const struct snd_soc_component_driver spdif_out_component = {
.name = "spdif-out",
.legacy_dai_naming = 1,
};
static int spdif_out_probe(struct platform_device *pdev)
{
struct spdif_out_dev *host;
struct spear_spdif_platform_data *pdata;
struct resource *res;
int ret;
host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
if (!host)
return -ENOMEM;
host->io_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(host->io_base))
return PTR_ERR(host->io_base);
host->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(host->clk))
return PTR_ERR(host->clk);
pdata = dev_get_platdata(&pdev->dev);
host->dma_params.data = pdata->dma_params;
host->dma_params.addr = res->start + SPDIF_OUT_FIFO_DATA;
host->dma_params.max_burst = 16;
host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
dev_set_drvdata(&pdev->dev, host);
ret = devm_snd_soc_register_component(&pdev->dev, &spdif_out_component,
&spdif_out_dai, 1);
if (ret)
return ret;
return devm_spear_pcm_platform_register(&pdev->dev, &host->config,
pdata->filter);
}
#ifdef CONFIG_PM
static int spdif_out_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);
if (host->running)
clk_disable(host->clk);
return 0;
}
static int spdif_out_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);
if (host->running) {
clk_enable(host->clk);
spdif_out_configure(host);
spdif_out_clock(host, host->saved_params.core_freq,
host->saved_params.rate);
}
return 0;
}
static SIMPLE_DEV_PM_OPS(spdif_out_dev_pm_ops, spdif_out_suspend, \
spdif_out_resume);
#define SPDIF_OUT_DEV_PM_OPS (&spdif_out_dev_pm_ops)
#else
#define SPDIF_OUT_DEV_PM_OPS NULL
#endif
static struct platform_driver spdif_out_driver = {
.probe = spdif_out_probe,
.driver = {
.name = "spdif-out",
.pm = SPDIF_OUT_DEV_PM_OPS,
},
};
module_platform_driver(spdif_out_driver);
MODULE_AUTHOR("Vipin Kumar <[email protected]>");
MODULE_DESCRIPTION("SPEAr SPDIF OUT SoC Interface");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:spdif_out");
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