1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2014 MediaTek Inc.
4  * Author: James Liao <jamesjj.liao@mediatek.com>
5  */
6 
7 #include <linux/delay.h>
8 #include <linux/device.h>
9 #include <linux/io.h>
10 #include <linux/of_device.h>
11 #include <linux/platform_device.h>
12 #include <linux/reset-controller.h>
13 #include <linux/soc/mediatek/mtk-mmsys.h>
14 
15 #include "mtk-mmsys.h"
16 #include "mt8167-mmsys.h"
17 #include "mt8183-mmsys.h"
18 #include "mt8192-mmsys.h"
19 #include "mt8365-mmsys.h"
20 
21 static const struct mtk_mmsys_driver_data mt2701_mmsys_driver_data = {
22 	.clk_driver = "clk-mt2701-mm",
23 	.routes = mmsys_default_routing_table,
24 	.num_routes = ARRAY_SIZE(mmsys_default_routing_table),
25 };
26 
27 static const struct mtk_mmsys_driver_data mt2712_mmsys_driver_data = {
28 	.clk_driver = "clk-mt2712-mm",
29 	.routes = mmsys_default_routing_table,
30 	.num_routes = ARRAY_SIZE(mmsys_default_routing_table),
31 };
32 
33 static const struct mtk_mmsys_driver_data mt6779_mmsys_driver_data = {
34 	.clk_driver = "clk-mt6779-mm",
35 };
36 
37 static const struct mtk_mmsys_driver_data mt6797_mmsys_driver_data = {
38 	.clk_driver = "clk-mt6797-mm",
39 };
40 
41 static const struct mtk_mmsys_driver_data mt8167_mmsys_driver_data = {
42 	.clk_driver = "clk-mt8167-mm",
43 	.routes = mt8167_mmsys_routing_table,
44 	.num_routes = ARRAY_SIZE(mt8167_mmsys_routing_table),
45 };
46 
47 static const struct mtk_mmsys_driver_data mt8173_mmsys_driver_data = {
48 	.clk_driver = "clk-mt8173-mm",
49 	.routes = mmsys_default_routing_table,
50 	.num_routes = ARRAY_SIZE(mmsys_default_routing_table),
51 };
52 
53 static const struct mtk_mmsys_driver_data mt8183_mmsys_driver_data = {
54 	.clk_driver = "clk-mt8183-mm",
55 	.routes = mmsys_mt8183_routing_table,
56 	.num_routes = ARRAY_SIZE(mmsys_mt8183_routing_table),
57 };
58 
59 static const struct mtk_mmsys_driver_data mt8192_mmsys_driver_data = {
60 	.clk_driver = "clk-mt8192-mm",
61 	.routes = mmsys_mt8192_routing_table,
62 	.num_routes = ARRAY_SIZE(mmsys_mt8192_routing_table),
63 };
64 
65 static const struct mtk_mmsys_driver_data mt8365_mmsys_driver_data = {
66 	.clk_driver = "clk-mt8365-mm",
67 	.routes = mt8365_mmsys_routing_table,
68 	.num_routes = ARRAY_SIZE(mt8365_mmsys_routing_table),
69 };
70 
71 struct mtk_mmsys {
72 	void __iomem *regs;
73 	const struct mtk_mmsys_driver_data *data;
74 	spinlock_t lock; /* protects mmsys_sw_rst_b reg */
75 	struct reset_controller_dev rcdev;
76 };
77 
mtk_mmsys_ddp_connect(struct device * dev,enum mtk_ddp_comp_id cur,enum mtk_ddp_comp_id next)78 void mtk_mmsys_ddp_connect(struct device *dev,
79 			   enum mtk_ddp_comp_id cur,
80 			   enum mtk_ddp_comp_id next)
81 {
82 	struct mtk_mmsys *mmsys = dev_get_drvdata(dev);
83 	const struct mtk_mmsys_routes *routes = mmsys->data->routes;
84 	u32 reg;
85 	int i;
86 
87 	for (i = 0; i < mmsys->data->num_routes; i++)
88 		if (cur == routes[i].from_comp && next == routes[i].to_comp) {
89 			reg = readl_relaxed(mmsys->regs + routes[i].addr);
90 			reg &= ~routes[i].mask;
91 			reg |= routes[i].val;
92 			writel_relaxed(reg, mmsys->regs + routes[i].addr);
93 		}
94 }
95 EXPORT_SYMBOL_GPL(mtk_mmsys_ddp_connect);
96 
mtk_mmsys_ddp_disconnect(struct device * dev,enum mtk_ddp_comp_id cur,enum mtk_ddp_comp_id next)97 void mtk_mmsys_ddp_disconnect(struct device *dev,
98 			      enum mtk_ddp_comp_id cur,
99 			      enum mtk_ddp_comp_id next)
100 {
101 	struct mtk_mmsys *mmsys = dev_get_drvdata(dev);
102 	const struct mtk_mmsys_routes *routes = mmsys->data->routes;
103 	u32 reg;
104 	int i;
105 
106 	for (i = 0; i < mmsys->data->num_routes; i++)
107 		if (cur == routes[i].from_comp && next == routes[i].to_comp) {
108 			reg = readl_relaxed(mmsys->regs + routes[i].addr);
109 			reg &= ~routes[i].mask;
110 			writel_relaxed(reg, mmsys->regs + routes[i].addr);
111 		}
112 }
113 EXPORT_SYMBOL_GPL(mtk_mmsys_ddp_disconnect);
114 
mtk_mmsys_reset_update(struct reset_controller_dev * rcdev,unsigned long id,bool assert)115 static int mtk_mmsys_reset_update(struct reset_controller_dev *rcdev, unsigned long id,
116 				  bool assert)
117 {
118 	struct mtk_mmsys *mmsys = container_of(rcdev, struct mtk_mmsys, rcdev);
119 	unsigned long flags;
120 	u32 reg;
121 
122 	spin_lock_irqsave(&mmsys->lock, flags);
123 
124 	reg = readl_relaxed(mmsys->regs + MMSYS_SW0_RST_B);
125 
126 	if (assert)
127 		reg &= ~BIT(id);
128 	else
129 		reg |= BIT(id);
130 
131 	writel_relaxed(reg, mmsys->regs + MMSYS_SW0_RST_B);
132 
133 	spin_unlock_irqrestore(&mmsys->lock, flags);
134 
135 	return 0;
136 }
137 
mtk_mmsys_reset_assert(struct reset_controller_dev * rcdev,unsigned long id)138 static int mtk_mmsys_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)
139 {
140 	return mtk_mmsys_reset_update(rcdev, id, true);
141 }
142 
mtk_mmsys_reset_deassert(struct reset_controller_dev * rcdev,unsigned long id)143 static int mtk_mmsys_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)
144 {
145 	return mtk_mmsys_reset_update(rcdev, id, false);
146 }
147 
mtk_mmsys_reset(struct reset_controller_dev * rcdev,unsigned long id)148 static int mtk_mmsys_reset(struct reset_controller_dev *rcdev, unsigned long id)
149 {
150 	int ret;
151 
152 	ret = mtk_mmsys_reset_assert(rcdev, id);
153 	if (ret)
154 		return ret;
155 
156 	usleep_range(1000, 1100);
157 
158 	return mtk_mmsys_reset_deassert(rcdev, id);
159 }
160 
161 static const struct reset_control_ops mtk_mmsys_reset_ops = {
162 	.assert = mtk_mmsys_reset_assert,
163 	.deassert = mtk_mmsys_reset_deassert,
164 	.reset = mtk_mmsys_reset,
165 };
166 
mtk_mmsys_probe(struct platform_device * pdev)167 static int mtk_mmsys_probe(struct platform_device *pdev)
168 {
169 	struct device *dev = &pdev->dev;
170 	struct platform_device *clks;
171 	struct platform_device *drm;
172 	struct mtk_mmsys *mmsys;
173 	int ret;
174 
175 	mmsys = devm_kzalloc(dev, sizeof(*mmsys), GFP_KERNEL);
176 	if (!mmsys)
177 		return -ENOMEM;
178 
179 	mmsys->regs = devm_platform_ioremap_resource(pdev, 0);
180 	if (IS_ERR(mmsys->regs)) {
181 		ret = PTR_ERR(mmsys->regs);
182 		dev_err(dev, "Failed to ioremap mmsys registers: %d\n", ret);
183 		return ret;
184 	}
185 
186 	spin_lock_init(&mmsys->lock);
187 
188 	mmsys->rcdev.owner = THIS_MODULE;
189 	mmsys->rcdev.nr_resets = 32;
190 	mmsys->rcdev.ops = &mtk_mmsys_reset_ops;
191 	mmsys->rcdev.of_node = pdev->dev.of_node;
192 	ret = devm_reset_controller_register(&pdev->dev, &mmsys->rcdev);
193 	if (ret) {
194 		dev_err(&pdev->dev, "Couldn't register mmsys reset controller: %d\n", ret);
195 		return ret;
196 	}
197 
198 	mmsys->data = of_device_get_match_data(&pdev->dev);
199 	platform_set_drvdata(pdev, mmsys);
200 
201 	clks = platform_device_register_data(&pdev->dev, mmsys->data->clk_driver,
202 					     PLATFORM_DEVID_AUTO, NULL, 0);
203 	if (IS_ERR(clks))
204 		return PTR_ERR(clks);
205 
206 	drm = platform_device_register_data(&pdev->dev, "mediatek-drm",
207 					    PLATFORM_DEVID_AUTO, NULL, 0);
208 	if (IS_ERR(drm)) {
209 		platform_device_unregister(clks);
210 		return PTR_ERR(drm);
211 	}
212 
213 	return 0;
214 }
215 
216 static const struct of_device_id of_match_mtk_mmsys[] = {
217 	{
218 		.compatible = "mediatek,mt2701-mmsys",
219 		.data = &mt2701_mmsys_driver_data,
220 	},
221 	{
222 		.compatible = "mediatek,mt2712-mmsys",
223 		.data = &mt2712_mmsys_driver_data,
224 	},
225 	{
226 		.compatible = "mediatek,mt6779-mmsys",
227 		.data = &mt6779_mmsys_driver_data,
228 	},
229 	{
230 		.compatible = "mediatek,mt6797-mmsys",
231 		.data = &mt6797_mmsys_driver_data,
232 	},
233 	{
234 		.compatible = "mediatek,mt8167-mmsys",
235 		.data = &mt8167_mmsys_driver_data,
236 	},
237 	{
238 		.compatible = "mediatek,mt8173-mmsys",
239 		.data = &mt8173_mmsys_driver_data,
240 	},
241 	{
242 		.compatible = "mediatek,mt8183-mmsys",
243 		.data = &mt8183_mmsys_driver_data,
244 	},
245 	{
246 		.compatible = "mediatek,mt8192-mmsys",
247 		.data = &mt8192_mmsys_driver_data,
248 	},
249 	{
250 		.compatible = "mediatek,mt8365-mmsys",
251 		.data = &mt8365_mmsys_driver_data,
252 	},
253 	{ }
254 };
255 
256 static struct platform_driver mtk_mmsys_drv = {
257 	.driver = {
258 		.name = "mtk-mmsys",
259 		.of_match_table = of_match_mtk_mmsys,
260 	},
261 	.probe = mtk_mmsys_probe,
262 };
263 
264 builtin_platform_driver(mtk_mmsys_drv);
265