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 #include "clk-regmap.h"
22
meson_aoclk_do_reset(struct reset_controller_dev * rcdev,unsigned long id)23 static int meson_aoclk_do_reset(struct reset_controller_dev *rcdev,
24 unsigned long id)
25 {
26 struct meson_aoclk_reset_controller *rstc =
27 container_of(rcdev, struct meson_aoclk_reset_controller, reset);
28
29 return regmap_write(rstc->regmap, rstc->data->reset_reg,
30 BIT(rstc->data->reset[id]));
31 }
32
33 static const struct reset_control_ops meson_aoclk_reset_ops = {
34 .reset = meson_aoclk_do_reset,
35 };
36
meson_aoclkc_probe(struct platform_device * pdev)37 int meson_aoclkc_probe(struct platform_device *pdev)
38 {
39 struct meson_aoclk_reset_controller *rstc;
40 const struct meson_clkc_data *clkc_data;
41 const struct meson_aoclk_data *data;
42 struct device *dev = &pdev->dev;
43 struct device_node *np;
44 struct regmap *regmap;
45 int ret;
46
47 clkc_data = of_device_get_match_data(dev);
48 if (!clkc_data)
49 return -EINVAL;
50
51 ret = meson_clkc_syscon_probe(pdev);
52 if (ret)
53 return ret;
54
55 data = container_of(clkc_data, struct meson_aoclk_data,
56 clkc_data);
57
58 rstc = devm_kzalloc(dev, sizeof(*rstc), GFP_KERNEL);
59 if (!rstc)
60 return -ENOMEM;
61
62 np = of_get_parent(dev->of_node);
63 regmap = syscon_node_to_regmap(np);
64 of_node_put(np);
65 if (IS_ERR(regmap)) {
66 dev_err(dev, "failed to get regmap\n");
67 return PTR_ERR(regmap);
68 }
69
70 /* Reset Controller */
71 rstc->data = data;
72 rstc->regmap = regmap;
73 rstc->reset.ops = &meson_aoclk_reset_ops;
74 rstc->reset.nr_resets = data->num_reset;
75 rstc->reset.of_node = dev->of_node;
76 ret = devm_reset_controller_register(dev, &rstc->reset);
77 if (ret) {
78 dev_err(dev, "failed to register reset controller\n");
79 return ret;
80 }
81
82 return 0;
83 }
84 EXPORT_SYMBOL_NS_GPL(meson_aoclkc_probe, "CLK_MESON");
85
86 MODULE_DESCRIPTION("Amlogic Always-ON Clock Controller helpers");
87 MODULE_LICENSE("GPL");
88 MODULE_IMPORT_NS("CLK_MESON");
89