1// SPDX-License-Identifier: GPL-2.0-or-later
2// Copyright 2020 Cerno
3
4#include <linux/clk-provider.h>
5#include <linux/module.h>
6#include <linux/platform_device.h>
7#include <linux/reset-controller.h>
8#include <linux/reset/reset-simple.h>
9
10#define DVP_HT_RPI_SW_INIT	0x04
11#define DVP_HT_RPI_MISC_CONFIG	0x08
12
13#define NR_CLOCKS	2
14#define NR_RESETS	6
15
16struct clk_dvp {
17	struct clk_hw_onecell_data	*data;
18	struct reset_simple_data	reset;
19};
20
21static const struct clk_parent_data clk_dvp_parent = {
22	.index	= 0,
23};
24
25static int clk_dvp_probe(struct platform_device *pdev)
26{
27	struct clk_hw_onecell_data *data;
28	struct resource *res;
29	struct clk_dvp *dvp;
30	void __iomem *base;
31	int ret;
32
33	dvp = devm_kzalloc(&pdev->dev, sizeof(*dvp), GFP_KERNEL);
34	if (!dvp)
35		return -ENOMEM;
36	platform_set_drvdata(pdev, dvp);
37
38	dvp->data = devm_kzalloc(&pdev->dev,
39				 struct_size(dvp->data, hws, NR_CLOCKS),
40				 GFP_KERNEL);
41	if (!dvp->data)
42		return -ENOMEM;
43	data = dvp->data;
44
45	base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
46	if (IS_ERR(base))
47		return PTR_ERR(base);
48
49	dvp->reset.rcdev.owner = THIS_MODULE;
50	dvp->reset.rcdev.nr_resets = NR_RESETS;
51	dvp->reset.rcdev.ops = &reset_simple_ops;
52	dvp->reset.rcdev.of_node = pdev->dev.of_node;
53	dvp->reset.membase = base + DVP_HT_RPI_SW_INIT;
54	spin_lock_init(&dvp->reset.lock);
55
56	ret = devm_reset_controller_register(&pdev->dev, &dvp->reset.rcdev);
57	if (ret)
58		return ret;
59
60	data->hws[0] = clk_hw_register_gate_parent_data(&pdev->dev,
61							"hdmi0-108MHz",
62							&clk_dvp_parent, 0,
63							base + DVP_HT_RPI_MISC_CONFIG, 3,
64							CLK_GATE_SET_TO_DISABLE,
65							&dvp->reset.lock);
66	if (IS_ERR(data->hws[0]))
67		return PTR_ERR(data->hws[0]);
68
69	data->hws[1] = clk_hw_register_gate_parent_data(&pdev->dev,
70							"hdmi1-108MHz",
71							&clk_dvp_parent, 0,
72							base + DVP_HT_RPI_MISC_CONFIG, 4,
73							CLK_GATE_SET_TO_DISABLE,
74							&dvp->reset.lock);
75	if (IS_ERR(data->hws[1])) {
76		ret = PTR_ERR(data->hws[1]);
77		goto unregister_clk0;
78	}
79
80	data->num = NR_CLOCKS;
81	ret = of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get,
82				     data);
83	if (ret)
84		goto unregister_clk1;
85
86	return 0;
87
88unregister_clk1:
89	clk_hw_unregister_gate(data->hws[1]);
90
91unregister_clk0:
92	clk_hw_unregister_gate(data->hws[0]);
93	return ret;
94};
95
96static int clk_dvp_remove(struct platform_device *pdev)
97{
98	struct clk_dvp *dvp = platform_get_drvdata(pdev);
99	struct clk_hw_onecell_data *data = dvp->data;
100
101	clk_hw_unregister_gate(data->hws[1]);
102	clk_hw_unregister_gate(data->hws[0]);
103
104	return 0;
105}
106
107static const struct of_device_id clk_dvp_dt_ids[] = {
108	{ .compatible = "brcm,brcm2711-dvp", },
109	{ /* sentinel */ }
110};
111MODULE_DEVICE_TABLE(of, clk_dvp_dt_ids);
112
113static struct platform_driver clk_dvp_driver = {
114	.probe	= clk_dvp_probe,
115	.remove	= clk_dvp_remove,
116	.driver	= {
117		.name		= "brcm2711-dvp",
118		.of_match_table	= clk_dvp_dt_ids,
119	},
120};
121module_platform_driver(clk_dvp_driver);
122
123MODULE_AUTHOR("Maxime Ripard <maxime@cerno.tech>");
124MODULE_DESCRIPTION("BCM2711 DVP clock driver");
125MODULE_LICENSE("GPL");
126