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 struct meson_aoclk_data *data;
41 struct device *dev = &pdev->dev;
42 struct device_node *np;
43 struct regmap *regmap;
44 int ret, clkid;
45
46 data = (struct meson_aoclk_data *) of_device_get_match_data(dev);
47 if (!data)
48 return -ENODEV;
49
50 rstc = devm_kzalloc(dev, sizeof(*rstc), GFP_KERNEL);
51 if (!rstc)
52 return -ENOMEM;
53
54 np = of_get_parent(dev->of_node);
55 regmap = syscon_node_to_regmap(np);
56 of_node_put(np);
57 if (IS_ERR(regmap)) {
58 dev_err(dev, "failed to get regmap\n");
59 return PTR_ERR(regmap);
60 }
61
62 /* Reset Controller */
63 rstc->data = data;
64 rstc->regmap = regmap;
65 rstc->reset.ops = &meson_aoclk_reset_ops;
66 rstc->reset.nr_resets = data->num_reset;
67 rstc->reset.of_node = dev->of_node;
68 ret = devm_reset_controller_register(dev, &rstc->reset);
69 if (ret) {
70 dev_err(dev, "failed to register reset controller\n");
71 return ret;
72 }
73
74 /* Register all clks */
75 for (clkid = 0; clkid < data->hw_clks.num; clkid++) {
76 if (!data->hw_clks.hws[clkid])
77 continue;
78
79 ret = devm_clk_hw_register(dev, data->hw_clks.hws[clkid]);
80 if (ret) {
81 dev_err(dev, "Clock registration failed\n");
82 return ret;
83 }
84 }
85
86 return devm_of_clk_add_hw_provider(dev, meson_clk_hw_get, (void *)&data->hw_clks);
87 }
88 EXPORT_SYMBOL_NS_GPL(meson_aoclkc_probe, "CLK_MESON");
89
90 MODULE_DESCRIPTION("Amlogic Always-ON Clock Controller helpers");
91 MODULE_LICENSE("GPL");
92 MODULE_IMPORT_NS("CLK_MESON");
93