1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Texas Instruments System Control Interface (TI SCI) power domain driver
4 *
5 * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
6 * Andreas Dannenberg <dannenberg@ti.com>
7 *
8 * Loosely based on Linux kernel ti_sci_pm_domains.c...
9 */
10
11 #include <common.h>
12 #include <dm.h>
13 #include <errno.h>
14 #include <power-domain-uclass.h>
15 #include <linux/soc/ti/ti_sci_protocol.h>
16
17 /**
18 * struct ti_sci_power_domain_data - pm domain controller information structure
19 * @sci: TI SCI handle used for communication with system controller
20 */
21 struct ti_sci_power_domain_data {
22 const struct ti_sci_handle *sci;
23 };
24
ti_sci_power_domain_probe(struct udevice * dev)25 static int ti_sci_power_domain_probe(struct udevice *dev)
26 {
27 struct ti_sci_power_domain_data *data = dev_get_priv(dev);
28
29 debug("%s(dev=%p)\n", __func__, dev);
30
31 if (!data)
32 return -ENOMEM;
33
34 /* Store handle for communication with the system controller */
35 data->sci = ti_sci_get_handle(dev);
36 if (IS_ERR(data->sci))
37 return PTR_ERR(data->sci);
38
39 return 0;
40 }
41
ti_sci_power_domain_request(struct power_domain * pd)42 static int ti_sci_power_domain_request(struct power_domain *pd)
43 {
44 debug("%s(pd=%p)\n", __func__, pd);
45 return 0;
46 }
47
ti_sci_power_domain_free(struct power_domain * pd)48 static int ti_sci_power_domain_free(struct power_domain *pd)
49 {
50 debug("%s(pd=%p)\n", __func__, pd);
51 return 0;
52 }
53
ti_sci_power_domain_on(struct power_domain * pd)54 static int ti_sci_power_domain_on(struct power_domain *pd)
55 {
56 struct ti_sci_power_domain_data *data = dev_get_priv(pd->dev);
57 const struct ti_sci_handle *sci = data->sci;
58 const struct ti_sci_dev_ops *dops = &sci->ops.dev_ops;
59 int ret;
60
61 debug("%s(pd=%p)\n", __func__, pd);
62
63 ret = dops->get_device(sci, pd->id);
64 if (ret)
65 dev_err(power_domain->dev, "%s: get_device failed (%d)\n",
66 __func__, ret);
67
68 return ret;
69 }
70
ti_sci_power_domain_off(struct power_domain * pd)71 static int ti_sci_power_domain_off(struct power_domain *pd)
72 {
73 struct ti_sci_power_domain_data *data = dev_get_priv(pd->dev);
74 const struct ti_sci_handle *sci = data->sci;
75 const struct ti_sci_dev_ops *dops = &sci->ops.dev_ops;
76 int ret;
77
78 debug("%s(pd=%p)\n", __func__, pd);
79
80 ret = dops->put_device(sci, pd->id);
81 if (ret)
82 dev_err(power_domain->dev, "%s: put_device failed (%d)\n",
83 __func__, ret);
84
85 return ret;
86 }
87
88 static const struct udevice_id ti_sci_power_domain_of_match[] = {
89 { .compatible = "ti,sci-pm-domain" },
90 { /* sentinel */ }
91 };
92
93 static struct power_domain_ops ti_sci_power_domain_ops = {
94 .request = ti_sci_power_domain_request,
95 .free = ti_sci_power_domain_free,
96 .on = ti_sci_power_domain_on,
97 .off = ti_sci_power_domain_off,
98 };
99
100 U_BOOT_DRIVER(ti_sci_pm_domains) = {
101 .name = "ti-sci-pm-domains",
102 .id = UCLASS_POWER_DOMAIN,
103 .of_match = ti_sci_power_domain_of_match,
104 .probe = ti_sci_power_domain_probe,
105 .priv_auto_alloc_size = sizeof(struct ti_sci_power_domain_data),
106 .ops = &ti_sci_power_domain_ops,
107 };
108