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 regmap *regmap;
40 int ret, clkid;
41
42 data = (struct meson_aoclk_data *) of_device_get_match_data(dev);
43 if (!data)
44 return -ENODEV;
45
46 rstc = devm_kzalloc(dev, sizeof(*rstc), GFP_KERNEL);
47 if (!rstc)
48 return -ENOMEM;
49
50 regmap = syscon_node_to_regmap(of_get_parent(dev->of_node));
51 if (IS_ERR(regmap)) {
52 dev_err(dev, "failed to get regmap\n");
53 return PTR_ERR(regmap);
54 }
55
56 /* Reset Controller */
57 rstc->data = data;
58 rstc->regmap = regmap;
59 rstc->reset.ops = &meson_aoclk_reset_ops;
60 rstc->reset.nr_resets = data->num_reset,
61 rstc->reset.of_node = dev->of_node;
62 ret = devm_reset_controller_register(dev, &rstc->reset);
63 if (ret) {
64 dev_err(dev, "failed to register reset controller\n");
65 return ret;
66 }
67
68 /* Populate regmap */
69 for (clkid = 0; clkid < data->num_clks; clkid++)
70 data->clks[clkid]->map = regmap;
71
72 /* Register all clks */
73 for (clkid = 0; clkid < data->hw_data->num; clkid++) {
74 if (!data->hw_data->hws[clkid])
75 continue;
76
77 ret = devm_clk_hw_register(dev, data->hw_data->hws[clkid]);
78 if (ret) {
79 dev_err(dev, "Clock registration failed\n");
80 return ret;
81 }
82 }
83
84 return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
85 (void *) data->hw_data);
86 }
87
