1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2023 MediaTek Inc.
4 */
5
6 #include <linux/clk.h>
7 #include <linux/component.h>
8 #include <linux/module.h>
9 #include <linux/of_device.h>
10 #include <linux/platform_device.h>
11 #include <linux/pm_runtime.h>
12 #include <linux/soc/mediatek/mtk-cmdq.h>
13
14 #include "mtk_crtc.h"
15 #include "mtk_ddp_comp.h"
16 #include "mtk_disp_drv.h"
17
18 #define PADDING_CONTROL_REG 0x00
19 #define PADDING_BYPASS BIT(0)
20 #define PADDING_ENABLE BIT(1)
21 #define PADDING_PIC_SIZE_REG 0x04
22 #define PADDING_H_REG 0x08 /* horizontal */
23 #define PADDING_V_REG 0x0c /* vertical */
24 #define PADDING_COLOR_REG 0x10
25
26 /**
27 * struct mtk_padding - Basic information of the Padding
28 * @clk: Clock of the module
29 * @reg: Virtual address of the Padding for CPU to access
30 * @cmdq_reg: CMDQ setting of the Padding
31 *
32 * Every Padding should have different clock source, register base, and
33 * CMDQ settings, we stored these differences all together.
34 */
35 struct mtk_padding {
36 struct clk *clk;
37 void __iomem *reg;
38 struct cmdq_client_reg cmdq_reg;
39 };
40
mtk_padding_clk_enable(struct device * dev)41 int mtk_padding_clk_enable(struct device *dev)
42 {
43 struct mtk_padding *padding = dev_get_drvdata(dev);
44
45 return clk_prepare_enable(padding->clk);
46 }
47
mtk_padding_clk_disable(struct device * dev)48 void mtk_padding_clk_disable(struct device *dev)
49 {
50 struct mtk_padding *padding = dev_get_drvdata(dev);
51
52 clk_disable_unprepare(padding->clk);
53 }
54
mtk_padding_start(struct device * dev)55 void mtk_padding_start(struct device *dev)
56 {
57 struct mtk_padding *padding = dev_get_drvdata(dev);
58
59 writel(PADDING_ENABLE | PADDING_BYPASS,
60 padding->reg + PADDING_CONTROL_REG);
61
62 /*
63 * Notice that even the padding is in bypass mode,
64 * all the settings must be cleared to 0 or
65 * undefined behaviors could happen
66 */
67 writel(0, padding->reg + PADDING_PIC_SIZE_REG);
68 writel(0, padding->reg + PADDING_H_REG);
69 writel(0, padding->reg + PADDING_V_REG);
70 writel(0, padding->reg + PADDING_COLOR_REG);
71 }
72
mtk_padding_stop(struct device * dev)73 void mtk_padding_stop(struct device *dev)
74 {
75 struct mtk_padding *padding = dev_get_drvdata(dev);
76
77 writel(0, padding->reg + PADDING_CONTROL_REG);
78 }
79
mtk_padding_bind(struct device * dev,struct device * master,void * data)80 static int mtk_padding_bind(struct device *dev, struct device *master, void *data)
81 {
82 return 0;
83 }
84
mtk_padding_unbind(struct device * dev,struct device * master,void * data)85 static void mtk_padding_unbind(struct device *dev, struct device *master, void *data)
86 {
87 }
88
89 static const struct component_ops mtk_padding_component_ops = {
90 .bind = mtk_padding_bind,
91 .unbind = mtk_padding_unbind,
92 };
93
mtk_padding_probe(struct platform_device * pdev)94 static int mtk_padding_probe(struct platform_device *pdev)
95 {
96 struct device *dev = &pdev->dev;
97 struct mtk_padding *priv;
98 struct resource *res;
99 int ret;
100
101 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
102 if (!priv)
103 return -ENOMEM;
104
105 priv->clk = devm_clk_get(dev, NULL);
106 if (IS_ERR(priv->clk))
107 return dev_err_probe(dev, PTR_ERR(priv->clk),
108 "failed to get clk\n");
109
110 priv->reg = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
111 if (IS_ERR(priv->reg))
112 return dev_err_probe(dev, PTR_ERR(priv->reg),
113 "failed to do ioremap\n");
114
115 #if IS_REACHABLE(CONFIG_MTK_CMDQ)
116 ret = cmdq_dev_get_client_reg(dev, &priv->cmdq_reg, 0);
117 if (ret)
118 return dev_err_probe(dev, ret, "failed to get gce client reg\n");
119 #endif
120
121 platform_set_drvdata(pdev, priv);
122
123 ret = devm_pm_runtime_enable(dev);
124 if (ret)
125 return ret;
126
127 ret = component_add(dev, &mtk_padding_component_ops);
128 if (ret) {
129 pm_runtime_disable(dev);
130 return dev_err_probe(dev, ret, "failed to add component\n");
131 }
132
133 return 0;
134 }
135
mtk_padding_remove(struct platform_device * pdev)136 static void mtk_padding_remove(struct platform_device *pdev)
137 {
138 component_del(&pdev->dev, &mtk_padding_component_ops);
139 }
140
141 static const struct of_device_id mtk_padding_driver_dt_match[] = {
142 { .compatible = "mediatek,mt8188-disp-padding" },
143 { /* sentinel */ }
144 };
145 MODULE_DEVICE_TABLE(of, mtk_padding_driver_dt_match);
146
147 struct platform_driver mtk_padding_driver = {
148 .probe = mtk_padding_probe,
149 .remove_new = mtk_padding_remove,
150 .driver = {
151 .name = "mediatek-disp-padding",
152 .of_match_table = mtk_padding_driver_dt_match,
153 },
154 };
155