// 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_crtc.h"#include "mtk_ddp_comp.h"#include "mtk_disp_drv.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))		return dev_err_probe(dev, PTR_ERR(priv->clk),				     "failed to get clk\n"); 	priv->reg = devm_platform_get_and_ioremap_resource(pdev, 0, &res);	if (IS_ERR(priv->reg))		return dev_err_probe(dev, PTR_ERR(priv->reg),				     "failed to do ioremap\n"); #if IS_REACHABLE(CONFIG_MTK_CMDQ)	ret = cmdq_dev_get_client_reg(dev, &priv->cmdq_reg, 0);	if (ret)		return dev_err_probe(dev, ret, "failed to get gce client reg\n");#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 void mtk_padding_remove(struct platform_device *pdev){	component_del(&pdev->dev, &mtk_padding_component_ops);} 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",		.of_match_table = mtk_padding_driver_dt_match,	},};