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 clk_dvp *dvp;
 29	void __iomem *base;
 30	int ret;
 31
 32	dvp = devm_kzalloc(&pdev->dev, sizeof(*dvp), GFP_KERNEL);
 33	if (!dvp)
 34		return -ENOMEM;
 35	platform_set_drvdata(pdev, dvp);
 36
 37	dvp->data = devm_kzalloc(&pdev->dev,
 38				 struct_size(dvp->data, hws, NR_CLOCKS),
 39				 GFP_KERNEL);
 40	if (!dvp->data)
 41		return -ENOMEM;
 42	data = dvp->data;
 43
 44	base = devm_platform_ioremap_resource(pdev, 0);
 45	if (IS_ERR(base))
 46		return PTR_ERR(base);
 47
 48	dvp->reset.rcdev.owner = THIS_MODULE;
 49	dvp->reset.rcdev.nr_resets = NR_RESETS;
 50	dvp->reset.rcdev.ops = &reset_simple_ops;
 51	dvp->reset.rcdev.of_node = pdev->dev.of_node;
 52	dvp->reset.membase = base + DVP_HT_RPI_SW_INIT;
 53	spin_lock_init(&dvp->reset.lock);
 54
 55	ret = devm_reset_controller_register(&pdev->dev, &dvp->reset.rcdev);
 56	if (ret)
 57		return ret;
 58
 59	data->hws[0] = clk_hw_register_gate_parent_data(&pdev->dev,
 60							"hdmi0-108MHz",
 61							&clk_dvp_parent, 0,
 62							base + DVP_HT_RPI_MISC_CONFIG, 3,
 63							CLK_GATE_SET_TO_DISABLE,
 64							&dvp->reset.lock);
 65	if (IS_ERR(data->hws[0]))
 66		return PTR_ERR(data->hws[0]);
 67
 68	data->hws[1] = clk_hw_register_gate_parent_data(&pdev->dev,
 69							"hdmi1-108MHz",
 70							&clk_dvp_parent, 0,
 71							base + DVP_HT_RPI_MISC_CONFIG, 4,
 72							CLK_GATE_SET_TO_DISABLE,
 73							&dvp->reset.lock);
 74	if (IS_ERR(data->hws[1])) {
 75		ret = PTR_ERR(data->hws[1]);
 76		goto unregister_clk0;
 77	}
 78
 79	data->num = NR_CLOCKS;
 80	ret = of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get,
 81				     data);
 82	if (ret)
 83		goto unregister_clk1;
 84
 85	return 0;
 86
 87unregister_clk1:
 88	clk_hw_unregister_gate(data->hws[1]);
 89
 90unregister_clk0:
 91	clk_hw_unregister_gate(data->hws[0]);
 92	return ret;
 93};
 94
 95static int clk_dvp_remove(struct platform_device *pdev)
 96{
 97	struct clk_dvp *dvp = platform_get_drvdata(pdev);
 98	struct clk_hw_onecell_data *data = dvp->data;
 99
100	clk_hw_unregister_gate(data->hws[1]);
101	clk_hw_unregister_gate(data->hws[0]);
102
103	return 0;
104}
105
106static const struct of_device_id clk_dvp_dt_ids[] = {
107	{ .compatible = "brcm,brcm2711-dvp", },
108	{ /* sentinel */ }
109};
110MODULE_DEVICE_TABLE(of, clk_dvp_dt_ids);
111
112static struct platform_driver clk_dvp_driver = {
113	.probe	= clk_dvp_probe,
114	.remove	= clk_dvp_remove,
115	.driver	= {
116		.name		= "brcm2711-dvp",
117		.of_match_table	= clk_dvp_dt_ids,
118	},
119};
120module_platform_driver(clk_dvp_driver);
121
122MODULE_AUTHOR("Maxime Ripard <maxime@cerno.tech>");
123MODULE_DESCRIPTION("BCM2711 DVP clock driver");
124MODULE_LICENSE("GPL");