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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2023 MediaTek Inc.
*/
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/soc/mediatek/mtk-cmdq.h>
#include "mtk_disp_drv.h"
#include "mtk_drm_crtc.h"
#include "mtk_drm_ddp_comp.h"
#define PADDING_CONTROL_REG 0x00
#define PADDING_BYPASS BIT(0)
#define PADDING_ENABLE BIT(1)
#define PADDING_PIC_SIZE_REG 0x04
#define PADDING_H_REG 0x08 /* horizontal */
#define PADDING_V_REG 0x0c /* vertical */
#define PADDING_COLOR_REG 0x10
/**
* struct mtk_padding - Basic information of the Padding
* @clk: Clock of the module
* @reg: Virtual address of the Padding for CPU to access
* @cmdq_reg: CMDQ setting of the Padding
*
* Every Padding should have different clock source, register base, and
* CMDQ settings, we stored these differences all together.
*/
struct mtk_padding {
struct clk *clk;
void __iomem *reg;
struct cmdq_client_reg cmdq_reg;
};
int mtk_padding_clk_enable(struct device *dev)
{
struct mtk_padding *padding = dev_get_drvdata(dev);
return clk_prepare_enable(padding->clk);
}
void mtk_padding_clk_disable(struct device *dev)
{
struct mtk_padding *padding = dev_get_drvdata(dev);
clk_disable_unprepare(padding->clk);
}
void mtk_padding_start(struct device *dev)
{
struct mtk_padding *padding = dev_get_drvdata(dev);
writel(PADDING_ENABLE | PADDING_BYPASS,
padding->reg + PADDING_CONTROL_REG);
/*
* Notice that even the padding is in bypass mode,
* all the settings must be cleared to 0 or
* undefined behaviors could happen
*/
writel(0, padding->reg + PADDING_PIC_SIZE_REG);
writel(0, padding->reg + PADDING_H_REG);
writel(0, padding->reg + PADDING_V_REG);
writel(0, padding->reg + PADDING_COLOR_REG);
}
void mtk_padding_stop(struct device *dev)
{
struct mtk_padding *padding = dev_get_drvdata(dev);
writel(0, padding->reg + PADDING_CONTROL_REG);
}
static int mtk_padding_bind(struct device *dev, struct device *master, void *data)
{
return 0;
}
static void mtk_padding_unbind(struct device *dev, struct device *master, void *data)
{
}
static const struct component_ops mtk_padding_component_ops = {
.bind = mtk_padding_bind,
.unbind = mtk_padding_unbind,
};
static int mtk_padding_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mtk_padding *priv;
struct resource *res;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->clk = devm_clk_get(dev, NULL);
if (IS_ERR(priv->clk)) {
dev_err(dev, "failed to get clk\n");
return PTR_ERR(priv->clk);
}
priv->reg = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(priv->reg)) {
dev_err(dev, "failed to do ioremap\n");
return PTR_ERR(priv->reg);
}
#if IS_REACHABLE(CONFIG_MTK_CMDQ)
ret = cmdq_dev_get_client_reg(dev, &priv->cmdq_reg, 0);
if (ret) {
dev_err(dev, "failed to get gce client reg\n");
return ret;
}
#endif
platform_set_drvdata(pdev, priv);
ret = devm_pm_runtime_enable(dev);
if (ret)
return ret;
ret = component_add(dev, &mtk_padding_component_ops);
if (ret) {
pm_runtime_disable(dev);
return dev_err_probe(dev, ret, "failed to add component\n");
}
return 0;
}
static int mtk_padding_remove(struct platform_device *pdev)
{
component_del(&pdev->dev, &mtk_padding_component_ops);
return 0;
}
static const struct of_device_id mtk_padding_driver_dt_match[] = {
{ .compatible = "mediatek,mt8188-disp-padding" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mtk_padding_driver_dt_match);
struct platform_driver mtk_padding_driver = {
.probe = mtk_padding_probe,
.remove = mtk_padding_remove,
.driver = {
.name = "mediatek-disp-padding",
.owner = THIS_MODULE,
.of_match_table = mtk_padding_driver_dt_match,
},
};
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