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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2025 NXP
*/
#include <linux/bitfield.h>
#include <linux/component.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <drm/bridge/dw_hdmi.h>
#include <sound/asoundef.h>
#define HTX_PAI_CTRL 0x00
#define ENABLE BIT(0)
#define HTX_PAI_CTRL_EXT 0x04
#define WTMK_HIGH_MASK GENMASK(31, 24)
#define WTMK_LOW_MASK GENMASK(23, 16)
#define NUM_CH_MASK GENMASK(10, 8)
#define WTMK_HIGH(n) FIELD_PREP(WTMK_HIGH_MASK, (n))
#define WTMK_LOW(n) FIELD_PREP(WTMK_LOW_MASK, (n))
#define NUM_CH(n) FIELD_PREP(NUM_CH_MASK, (n) - 1)
#define HTX_PAI_FIELD_CTRL 0x08
#define PRE_SEL GENMASK(28, 24)
#define D_SEL GENMASK(23, 20)
#define V_SEL GENMASK(19, 15)
#define U_SEL GENMASK(14, 10)
#define C_SEL GENMASK(9, 5)
#define P_SEL GENMASK(4, 0)
struct imx8mp_hdmi_pai {
struct regmap *regmap;
};
static void imx8mp_hdmi_pai_enable(struct dw_hdmi *dw_hdmi, int channel,
int width, int rate, int non_pcm,
int iec958)
{
const struct dw_hdmi_plat_data *pdata = dw_hdmi_to_plat_data(dw_hdmi);
struct imx8mp_hdmi_pai *hdmi_pai = pdata->priv_audio;
int val;
/* PAI set control extended */
val = WTMK_HIGH(3) | WTMK_LOW(3);
val |= NUM_CH(channel);
regmap_write(hdmi_pai->regmap, HTX_PAI_CTRL_EXT, val);
/* IEC60958 format */
if (iec958) {
val = FIELD_PREP_CONST(P_SEL,
__bf_shf(IEC958_SUBFRAME_PARITY));
val |= FIELD_PREP_CONST(C_SEL,
__bf_shf(IEC958_SUBFRAME_CHANNEL_STATUS));
val |= FIELD_PREP_CONST(U_SEL,
__bf_shf(IEC958_SUBFRAME_USER_DATA));
val |= FIELD_PREP_CONST(V_SEL,
__bf_shf(IEC958_SUBFRAME_VALIDITY));
val |= FIELD_PREP_CONST(D_SEL,
__bf_shf(IEC958_SUBFRAME_SAMPLE_24_MASK));
val |= FIELD_PREP_CONST(PRE_SEL,
__bf_shf(IEC958_SUBFRAME_PREAMBLE_MASK));
} else {
/*
* The allowed PCM widths are 24bit and 32bit, as they are supported
* by aud2htx module.
* for 24bit, D_SEL = 0, select all the bits.
* for 32bit, D_SEL = 8, select 24bit in MSB.
*/
val = FIELD_PREP(D_SEL, width - 24);
}
regmap_write(hdmi_pai->regmap, HTX_PAI_FIELD_CTRL, val);
/* PAI start running */
regmap_write(hdmi_pai->regmap, HTX_PAI_CTRL, ENABLE);
}
static void imx8mp_hdmi_pai_disable(struct dw_hdmi *dw_hdmi)
{
const struct dw_hdmi_plat_data *pdata = dw_hdmi_to_plat_data(dw_hdmi);
struct imx8mp_hdmi_pai *hdmi_pai = pdata->priv_audio;
/* Stop PAI */
regmap_write(hdmi_pai->regmap, HTX_PAI_CTRL, 0);
}
static const struct regmap_config imx8mp_hdmi_pai_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = HTX_PAI_FIELD_CTRL,
};
static int imx8mp_hdmi_pai_bind(struct device *dev, struct device *master, void *data)
{
struct platform_device *pdev = to_platform_device(dev);
struct dw_hdmi_plat_data *plat_data = data;
struct imx8mp_hdmi_pai *hdmi_pai;
struct resource *res;
void __iomem *base;
hdmi_pai = devm_kzalloc(dev, sizeof(*hdmi_pai), GFP_KERNEL);
if (!hdmi_pai)
return -ENOMEM;
base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(base))
return PTR_ERR(base);
hdmi_pai->regmap = devm_regmap_init_mmio_clk(dev, "apb", base,
&imx8mp_hdmi_pai_regmap_config);
if (IS_ERR(hdmi_pai->regmap)) {
dev_err(dev, "regmap init failed\n");
return PTR_ERR(hdmi_pai->regmap);
}
plat_data->enable_audio = imx8mp_hdmi_pai_enable;
plat_data->disable_audio = imx8mp_hdmi_pai_disable;
plat_data->priv_audio = hdmi_pai;
return 0;
}
static const struct component_ops imx8mp_hdmi_pai_ops = {
.bind = imx8mp_hdmi_pai_bind,
};
static int imx8mp_hdmi_pai_probe(struct platform_device *pdev)
{
return component_add(&pdev->dev, &imx8mp_hdmi_pai_ops);
}
static void imx8mp_hdmi_pai_remove(struct platform_device *pdev)
{
component_del(&pdev->dev, &imx8mp_hdmi_pai_ops);
}
static const struct of_device_id imx8mp_hdmi_pai_of_table[] = {
{ .compatible = "fsl,imx8mp-hdmi-pai" },
{ /* Sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx8mp_hdmi_pai_of_table);
static struct platform_driver imx8mp_hdmi_pai_platform_driver = {
.probe = imx8mp_hdmi_pai_probe,
.remove = imx8mp_hdmi_pai_remove,
.driver = {
.name = "imx8mp-hdmi-pai",
.of_match_table = imx8mp_hdmi_pai_of_table,
},
};
module_platform_driver(imx8mp_hdmi_pai_platform_driver);
MODULE_DESCRIPTION("i.MX8MP HDMI PAI driver");
MODULE_LICENSE("GPL");
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