1// SPDX-License-Identifier: GPL-2.0+
 2/*
 3 * Amlogic Meson-AXG Clock Controller Driver
 4 *
 5 * Copyright (c) 2016 BayLibre, SAS.
 6 * Author: Neil Armstrong <narmstrong@baylibre.com>
 7 *
 8 * Copyright (c) 2018 Amlogic, inc.
 9 * Author: Qiufang Dai <qiufang.dai@amlogic.com>
10 * Author: Yixun Lan <yixun.lan@amlogic.com>
11 */
12
13#include <linux/platform_device.h>
14#include <linux/reset-controller.h>
15#include <linux/mfd/syscon.h>
16#include <linux/of.h>
17#include <linux/module.h>
18
19#include <linux/slab.h>
20#include "meson-aoclk.h"
21
22static int meson_aoclk_do_reset(struct reset_controller_dev *rcdev,
23			       unsigned long id)
24{
25	struct meson_aoclk_reset_controller *rstc =
26		container_of(rcdev, struct meson_aoclk_reset_controller, reset);
27
28	return regmap_write(rstc->regmap, rstc->data->reset_reg,
29			    BIT(rstc->data->reset[id]));
30}
31
32static const struct reset_control_ops meson_aoclk_reset_ops = {
33	.reset = meson_aoclk_do_reset,
34};
35
36int meson_aoclkc_probe(struct platform_device *pdev)
37{
38	struct meson_aoclk_reset_controller *rstc;
39	struct meson_aoclk_data *data;
40	struct device *dev = &pdev->dev;
41	struct device_node *np;
42	struct regmap *regmap;
43	int ret, clkid;
44
45	data = (struct meson_aoclk_data *) of_device_get_match_data(dev);
46	if (!data)
47		return -ENODEV;
48
49	rstc = devm_kzalloc(dev, sizeof(*rstc), GFP_KERNEL);
50	if (!rstc)
51		return -ENOMEM;
52
53	np = of_get_parent(dev->of_node);
54	regmap = syscon_node_to_regmap(np);
55	of_node_put(np);
56	if (IS_ERR(regmap)) {
57		dev_err(dev, "failed to get regmap\n");
58		return PTR_ERR(regmap);
59	}
60
61	/* Reset Controller */
62	rstc->data = data;
63	rstc->regmap = regmap;
64	rstc->reset.ops = &meson_aoclk_reset_ops;
65	rstc->reset.nr_resets = data->num_reset;
66	rstc->reset.of_node = dev->of_node;
67	ret = devm_reset_controller_register(dev, &rstc->reset);
68	if (ret) {
69		dev_err(dev, "failed to register reset controller\n");
70		return ret;
71	}
72
73	/* Populate regmap */
74	for (clkid = 0; clkid < data->num_clks; clkid++)
75		data->clks[clkid]->map = regmap;
76
77	/* Register all clks */
78	for (clkid = 0; clkid < data->hw_clks.num; clkid++) {
79		if (!data->hw_clks.hws[clkid])
80			continue;
81
82		ret = devm_clk_hw_register(dev, data->hw_clks.hws[clkid]);
83		if (ret) {
84			dev_err(dev, "Clock registration failed\n");
85			return ret;
86		}
87	}
88
89	return devm_of_clk_add_hw_provider(dev, meson_clk_hw_get, (void *)&data->hw_clks);
90}
91EXPORT_SYMBOL_GPL(meson_aoclkc_probe);
92MODULE_LICENSE("GPL v2");