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_device.h>
17 #include <linux/slab.h>
18 #include "meson-aoclk.h"
19
meson_aoclk_do_reset(struct reset_controller_dev * rcdev,unsigned long id)20 static int meson_aoclk_do_reset(struct reset_controller_dev *rcdev,
21 unsigned long id)
22 {
23 struct meson_aoclk_reset_controller *rstc =
24 container_of(rcdev, struct meson_aoclk_reset_controller, reset);
25
26 return regmap_write(rstc->regmap, rstc->data->reset_reg,
27 BIT(rstc->data->reset[id]));
28 }
29
30 static const struct reset_control_ops meson_aoclk_reset_ops = {
31 .reset = meson_aoclk_do_reset,
32 };
33
meson_aoclkc_probe(struct platform_device * pdev)34 int meson_aoclkc_probe(struct platform_device *pdev)
35 {
36 struct meson_aoclk_reset_controller *rstc;
37 struct meson_aoclk_data *data;
38 struct device *dev = &pdev->dev;
39 struct device_node *np;
40 struct regmap *regmap;
41 int ret, clkid;
42
43 data = (struct meson_aoclk_data *) of_device_get_match_data(dev);
44 if (!data)
45 return -ENODEV;
46
47 rstc = devm_kzalloc(dev, sizeof(*rstc), GFP_KERNEL);
48 if (!rstc)
49 return -ENOMEM;
50
51 np = of_get_parent(dev->of_node);
52 regmap = syscon_node_to_regmap(np);
53 of_node_put(np);
54 if (IS_ERR(regmap)) {
55 dev_err(dev, "failed to get regmap\n");
56 return PTR_ERR(regmap);
57 }
58
59 /* Reset Controller */
60 rstc->data = data;
61 rstc->regmap = regmap;
62 rstc->reset.ops = &meson_aoclk_reset_ops;
63 rstc->reset.nr_resets = data->num_reset;
64 rstc->reset.of_node = dev->of_node;
65 ret = devm_reset_controller_register(dev, &rstc->reset);
66 if (ret) {
67 dev_err(dev, "failed to register reset controller\n");
68 return ret;
69 }
70
71 /* Populate regmap */
72 for (clkid = 0; clkid < data->num_clks; clkid++)
73 data->clks[clkid]->map = regmap;
74
75 /* Register all clks */
76 for (clkid = 0; clkid < data->hw_data->num; clkid++) {
77 if (!data->hw_data->hws[clkid])
78 continue;
79
80 ret = devm_clk_hw_register(dev, data->hw_data->hws[clkid]);
81 if (ret) {
82 dev_err(dev, "Clock registration failed\n");
83 return ret;
84 }
85 }
86
87 return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
88 (void *) data->hw_data);
89 }
90