#include <linux/clk.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <sound/core.h>
#include <sound/dmaengine_pcm.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#define IMG_SPDIF_OUT_TX_FIFO 0x0
#define IMG_SPDIF_OUT_CTL 0x4
#define IMG_SPDIF_OUT_CTL_FS_MASK BIT(4)
#define IMG_SPDIF_OUT_CTL_CLK_MASK BIT(2)
#define IMG_SPDIF_OUT_CTL_SRT_MASK BIT(0)
#define IMG_SPDIF_OUT_CSL 0x14
#define IMG_SPDIF_OUT_CSH_UV 0x18
#define IMG_SPDIF_OUT_CSH_UV_CSH_SHIFT 0
#define IMG_SPDIF_OUT_CSH_UV_CSH_MASK 0xff
struct img_spdif_out {
spinlock_t lock;
void __iomem *base;
struct clk *clk_sys;
struct clk *clk_ref;
struct snd_dmaengine_dai_dma_data dma_data;
struct device *dev;
struct reset_control *rst;
u32 suspend_ctl;
u32 suspend_csl;
u32 suspend_csh;
};
static int img_spdif_out_runtime_suspend(struct device *dev)
{
struct img_spdif_out *spdif = dev_get_drvdata(dev);
clk_disable_unprepare(spdif->clk_ref);
clk_disable_unprepare(spdif->clk_sys);
return 0;
}
static int img_spdif_out_runtime_resume(struct device *dev)
{
struct img_spdif_out *spdif = dev_get_drvdata(dev);
int ret;
ret = clk_prepare_enable(spdif->clk_sys);
if (ret) {
dev_err(dev, "clk_enable failed: %d\n", ret);
return ret;
}
ret = clk_prepare_enable(spdif->clk_ref);
if (ret) {
dev_err(dev, "clk_enable failed: %d\n", ret);
clk_disable_unprepare(spdif->clk_sys);
return ret;
}
return 0;
}
static inline void img_spdif_out_writel(struct img_spdif_out *spdif, u32 val,
u32 reg)
{
writel(val, spdif->base + reg);
}
static inline u32 img_spdif_out_readl(struct img_spdif_out *spdif, u32 reg)
{
return readl(spdif->base + reg);
}
static void img_spdif_out_reset(struct img_spdif_out *spdif)
{
u32 ctl, status_low, status_high;
ctl = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CTL) &
~IMG_SPDIF_OUT_CTL_SRT_MASK;
status_low = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSL);
status_high = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSH_UV);
reset_control_assert(spdif->rst);
reset_control_deassert(spdif->rst);
img_spdif_out_writel(spdif, ctl, IMG_SPDIF_OUT_CTL);
img_spdif_out_writel(spdif, status_low, IMG_SPDIF_OUT_CSL);
img_spdif_out_writel(spdif, status_high, IMG_SPDIF_OUT_CSH_UV);
}
static int img_spdif_out_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
uinfo->count = 1;
return 0;
}
static int img_spdif_out_get_status_mask(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
ucontrol->value.iec958.status[0] = 0xff;
ucontrol->value.iec958.status[1] = 0xff;
ucontrol->value.iec958.status[2] = 0xff;
ucontrol->value.iec958.status[3] = 0xff;
ucontrol->value.iec958.status[4] = 0xff;
return 0;
}
static int img_spdif_out_get_status(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(cpu_dai);
u32 reg;
unsigned long flags;
spin_lock_irqsave(&spdif->lock, flags);
reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSL);
ucontrol->value.iec958.status[0] = reg & 0xff;
ucontrol->value.iec958.status[1] = (reg >> 8) & 0xff;
ucontrol->value.iec958.status[2] = (reg >> 16) & 0xff;
ucontrol->value.iec958.status[3] = (reg >> 24) & 0xff;
reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSH_UV);
ucontrol->value.iec958.status[4] =
(reg & IMG_SPDIF_OUT_CSH_UV_CSH_MASK) >>
IMG_SPDIF_OUT_CSH_UV_CSH_SHIFT;
spin_unlock_irqrestore(&spdif->lock, flags);
return 0;
}
static int img_spdif_out_set_status(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(cpu_dai);
u32 reg;
unsigned long flags;
reg = ((u32)ucontrol->value.iec958.status[3] << 24);
reg |= ((u32)ucontrol->value.iec958.status[2] << 16);
reg |= ((u32)ucontrol->value.iec958.status[1] << 8);
reg |= (u32)ucontrol->value.iec958.status[0];
spin_lock_irqsave(&spdif->lock, flags);
img_spdif_out_writel(spdif, reg, IMG_SPDIF_OUT_CSL);
reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSH_UV);
reg &= ~IMG_SPDIF_OUT_CSH_UV_CSH_MASK;
reg |= (u32)ucontrol->value.iec958.status[4] <<
IMG_SPDIF_OUT_CSH_UV_CSH_SHIFT;
img_spdif_out_writel(spdif, reg, IMG_SPDIF_OUT_CSH_UV);
spin_unlock_irqrestore(&spdif->lock, flags);
return 0;
}
static struct snd_kcontrol_new img_spdif_out_controls[] = {
{
.access = SNDRV_CTL_ELEM_ACCESS_READ,
.iface = SNDRV_CTL_ELEM_IFACE_PCM,
.name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, MASK),
.info = img_spdif_out_info,
.get = img_spdif_out_get_status_mask
},
{
.iface = SNDRV_CTL_ELEM_IFACE_PCM,
.name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT),
.info = img_spdif_out_info,
.get = img_spdif_out_get_status,
.put = img_spdif_out_set_status
}
};
static int img_spdif_out_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(dai);
u32 reg;
unsigned long flags;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CTL);
reg |= IMG_SPDIF_OUT_CTL_SRT_MASK;
img_spdif_out_writel(spdif, reg, IMG_SPDIF_OUT_CTL);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
spin_lock_irqsave(&spdif->lock, flags);
img_spdif_out_reset(spdif);
spin_unlock_irqrestore(&spdif->lock, flags);
break;
default:
return -EINVAL;
}
return 0;
}
static int img_spdif_out_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
{
struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(dai);
unsigned int channels;
long pre_div_a, pre_div_b, diff_a, diff_b, rate, clk_rate;
u32 reg;
snd_pcm_format_t format;
rate = params_rate(params);
format = params_format(params);
channels = params_channels(params);
dev_dbg(spdif->dev, "hw_params rate %ld channels %u format %u\n",
rate, channels, format);
if (format != SNDRV_PCM_FORMAT_S32_LE)
return -EINVAL;
if (channels != 2)
return -EINVAL;
pre_div_a = clk_round_rate(spdif->clk_ref, rate * 256);
if (pre_div_a < 0)
return pre_div_a;
pre_div_b = clk_round_rate(spdif->clk_ref, rate * 384);
if (pre_div_b < 0)
return pre_div_b;
diff_a = abs((pre_div_a / 256) - rate);
diff_b = abs((pre_div_b / 384) - rate);
if (diff_a > diff_b)
clk_set_rate(spdif->clk_ref, pre_div_b);
else
clk_set_rate(spdif->clk_ref, pre_div_a);
clk_rate = clk_get_rate(spdif->clk_ref);
diff_a = abs((clk_rate / 256) - rate);
diff_b = abs((clk_rate / 384) - rate);
reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CTL);
if (diff_a <= diff_b)
reg &= ~IMG_SPDIF_OUT_CTL_CLK_MASK;
else
reg |= IMG_SPDIF_OUT_CTL_CLK_MASK;
img_spdif_out_writel(spdif, reg, IMG_SPDIF_OUT_CTL);
return 0;
}
static int img_spdif_out_dai_probe(struct snd_soc_dai *dai)
{
struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(dai);
snd_soc_dai_init_dma_data(dai, &spdif->dma_data, NULL);
snd_soc_add_dai_controls(dai, img_spdif_out_controls,
ARRAY_SIZE(img_spdif_out_controls));
return 0;
}
static const struct snd_soc_dai_ops img_spdif_out_dai_ops = {
.probe = img_spdif_out_dai_probe,
.trigger = img_spdif_out_trigger,
.hw_params = img_spdif_out_hw_params
};
static struct snd_soc_dai_driver img_spdif_out_dai = {
.playback = {
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_192000,
.formats = SNDRV_PCM_FMTBIT_S32_LE
},
.ops = &img_spdif_out_dai_ops
};
static const struct snd_soc_component_driver img_spdif_out_component = {
.name = "img-spdif-out",
.legacy_dai_naming = 1,
};
static int img_spdif_out_probe(struct platform_device *pdev)
{
struct img_spdif_out *spdif;
struct resource *res;
void __iomem *base;
int ret;
struct device *dev = &pdev->dev;
spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL);
if (!spdif)
return -ENOMEM;
platform_set_drvdata(pdev, spdif);
spdif->dev = &pdev->dev;
base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(base))
return PTR_ERR(base);
spdif->base = base;
spdif->rst = devm_reset_control_get_exclusive(&pdev->dev, "rst");
if (IS_ERR(spdif->rst))
return dev_err_probe(&pdev->dev, PTR_ERR(spdif->rst),
"No top level reset found\n");
spdif->clk_sys = devm_clk_get(&pdev->dev, "sys");
if (IS_ERR(spdif->clk_sys))
return dev_err_probe(dev, PTR_ERR(spdif->clk_sys),
"Failed to acquire clock 'sys'\n");
spdif->clk_ref = devm_clk_get(&pdev->dev, "ref");
if (IS_ERR(spdif->clk_ref))
return dev_err_probe(dev, PTR_ERR(spdif->clk_ref),
"Failed to acquire clock 'ref'\n");
pm_runtime_enable(&pdev->dev);
if (!pm_runtime_enabled(&pdev->dev)) {
ret = img_spdif_out_runtime_resume(&pdev->dev);
if (ret)
goto err_pm_disable;
}
ret = pm_runtime_resume_and_get(&pdev->dev);
if (ret < 0)
goto err_suspend;
img_spdif_out_writel(spdif, IMG_SPDIF_OUT_CTL_FS_MASK,
IMG_SPDIF_OUT_CTL);
img_spdif_out_reset(spdif);
pm_runtime_put(&pdev->dev);
spin_lock_init(&spdif->lock);
spdif->dma_data.addr = res->start + IMG_SPDIF_OUT_TX_FIFO;
spdif->dma_data.addr_width = 4;
spdif->dma_data.maxburst = 4;
ret = devm_snd_soc_register_component(&pdev->dev,
&img_spdif_out_component,
&img_spdif_out_dai, 1);
if (ret)
goto err_suspend;
ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
if (ret)
goto err_suspend;
dev_dbg(&pdev->dev, "Probe successful\n");
return 0;
err_suspend:
if (!pm_runtime_status_suspended(&pdev->dev))
img_spdif_out_runtime_suspend(&pdev->dev);
err_pm_disable:
pm_runtime_disable(&pdev->dev);
return ret;
}
static void img_spdif_out_dev_remove(struct platform_device *pdev)
{
pm_runtime_disable(&pdev->dev);
if (!pm_runtime_status_suspended(&pdev->dev))
img_spdif_out_runtime_suspend(&pdev->dev);
}
static int img_spdif_out_suspend(struct device *dev)
{
struct img_spdif_out *spdif = dev_get_drvdata(dev);
int ret;
if (pm_runtime_status_suspended(dev)) {
ret = img_spdif_out_runtime_resume(dev);
if (ret)
return ret;
}
spdif->suspend_ctl = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CTL);
spdif->suspend_csl = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSL);
spdif->suspend_csh = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSH_UV);
img_spdif_out_runtime_suspend(dev);
return 0;
}
static int img_spdif_out_resume(struct device *dev)
{
struct img_spdif_out *spdif = dev_get_drvdata(dev);
int ret;
ret = img_spdif_out_runtime_resume(dev);
if (ret)
return ret;
img_spdif_out_writel(spdif, spdif->suspend_ctl, IMG_SPDIF_OUT_CTL);
img_spdif_out_writel(spdif, spdif->suspend_csl, IMG_SPDIF_OUT_CSL);
img_spdif_out_writel(spdif, spdif->suspend_csh, IMG_SPDIF_OUT_CSH_UV);
if (pm_runtime_status_suspended(dev))
img_spdif_out_runtime_suspend(dev);
return 0;
}
static const struct of_device_id img_spdif_out_of_match[] = {
{ .compatible = "img,spdif-out" },
{}
};
MODULE_DEVICE_TABLE(of, img_spdif_out_of_match);
static const struct dev_pm_ops img_spdif_out_pm_ops = {
RUNTIME_PM_OPS(img_spdif_out_runtime_suspend, img_spdif_out_runtime_resume, NULL)
SYSTEM_SLEEP_PM_OPS(img_spdif_out_suspend, img_spdif_out_resume)
};
static struct platform_driver img_spdif_out_driver = {
.driver = {
.name = "img-spdif-out",
.of_match_table = img_spdif_out_of_match,
.pm = pm_ptr(&img_spdif_out_pm_ops)
},
.probe = img_spdif_out_probe,
.remove = img_spdif_out_dev_remove
};
module_platform_driver(img_spdif_out_driver);
MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>");
MODULE_DESCRIPTION("IMG SPDIF Output driver");
MODULE_LICENSE("GPL v2");
