1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2016, NVIDIA CORPORATION.
4 */
5
6 #include <common.h>
7 #include <dm.h>
8 #include <power-domain.h>
9 #include <power-domain-uclass.h>
10
power_domain_dev_ops(struct udevice * dev)11 static inline struct power_domain_ops *power_domain_dev_ops(struct udevice *dev)
12 {
13 return (struct power_domain_ops *)dev->driver->ops;
14 }
15
power_domain_of_xlate_default(struct power_domain * power_domain,struct ofnode_phandle_args * args)16 static int power_domain_of_xlate_default(struct power_domain *power_domain,
17 struct ofnode_phandle_args *args)
18 {
19 debug("%s(power_domain=%p)\n", __func__, power_domain);
20
21 if (args->args_count != 1) {
22 debug("Invalid args_count: %d\n", args->args_count);
23 return -EINVAL;
24 }
25
26 power_domain->id = args->args[0];
27
28 return 0;
29 }
30
power_domain_get_by_index(struct udevice * dev,struct power_domain * power_domain,int index)31 int power_domain_get_by_index(struct udevice *dev,
32 struct power_domain *power_domain, int index)
33 {
34 struct ofnode_phandle_args args;
35 int ret;
36 struct udevice *dev_power_domain;
37 struct power_domain_ops *ops;
38
39 debug("%s(dev=%p, power_domain=%p)\n", __func__, dev, power_domain);
40
41 ret = dev_read_phandle_with_args(dev, "power-domains",
42 "#power-domain-cells", 0, index,
43 &args);
44 if (ret) {
45 debug("%s: dev_read_phandle_with_args failed: %d\n",
46 __func__, ret);
47 return ret;
48 }
49
50 ret = uclass_get_device_by_ofnode(UCLASS_POWER_DOMAIN, args.node,
51 &dev_power_domain);
52 if (ret) {
53 debug("%s: uclass_get_device_by_ofnode failed: %d\n",
54 __func__, ret);
55 return ret;
56 }
57 ops = power_domain_dev_ops(dev_power_domain);
58
59 power_domain->dev = dev_power_domain;
60 if (ops->of_xlate)
61 ret = ops->of_xlate(power_domain, &args);
62 else
63 ret = power_domain_of_xlate_default(power_domain, &args);
64 if (ret) {
65 debug("of_xlate() failed: %d\n", ret);
66 return ret;
67 }
68
69 ret = ops->request(power_domain);
70 if (ret) {
71 debug("ops->request() failed: %d\n", ret);
72 return ret;
73 }
74
75 return 0;
76 }
77
power_domain_get(struct udevice * dev,struct power_domain * power_domain)78 int power_domain_get(struct udevice *dev, struct power_domain *power_domain)
79 {
80 return power_domain_get_by_index(dev, power_domain, 0);
81 }
82
power_domain_free(struct power_domain * power_domain)83 int power_domain_free(struct power_domain *power_domain)
84 {
85 struct power_domain_ops *ops = power_domain_dev_ops(power_domain->dev);
86
87 debug("%s(power_domain=%p)\n", __func__, power_domain);
88
89 return ops->free(power_domain);
90 }
91
power_domain_on(struct power_domain * power_domain)92 int power_domain_on(struct power_domain *power_domain)
93 {
94 struct power_domain_ops *ops = power_domain_dev_ops(power_domain->dev);
95
96 debug("%s(power_domain=%p)\n", __func__, power_domain);
97
98 return ops->on(power_domain);
99 }
100
power_domain_off(struct power_domain * power_domain)101 int power_domain_off(struct power_domain *power_domain)
102 {
103 struct power_domain_ops *ops = power_domain_dev_ops(power_domain->dev);
104
105 debug("%s(power_domain=%p)\n", __func__, power_domain);
106
107 return ops->off(power_domain);
108 }
109
110 UCLASS_DRIVER(power_domain) = {
111 .id = UCLASS_POWER_DOMAIN,
112 .name = "power_domain",
113 };
114