1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2014 Linaro Ltd.
4 *
5 * Author: Ulf Hansson <ulf.hansson@linaro.org>
6 *
7 * Implements PM domains using the generic PM domain for ux500.
8 */
9 #include <linux/device.h>
10 #include <linux/kernel.h>
11 #include <linux/platform_device.h>
12 #include <linux/printk.h>
13 #include <linux/slab.h>
14 #include <linux/err.h>
15 #include <linux/of.h>
16 #include <linux/pm_domain.h>
17
18 #include <dt-bindings/arm/ux500_pm_domains.h>
19
pd_power_off(struct generic_pm_domain * domain)20 static int pd_power_off(struct generic_pm_domain *domain)
21 {
22 /*
23 * Handle the gating of the PM domain regulator here.
24 *
25 * Drivers/subsystems handling devices in the PM domain needs to perform
26 * register context save/restore from their respective runtime PM
27 * callbacks, to be able to enable PM domain gating/ungating.
28 */
29 return 0;
30 }
31
pd_power_on(struct generic_pm_domain * domain)32 static int pd_power_on(struct generic_pm_domain *domain)
33 {
34 /*
35 * Handle the ungating of the PM domain regulator here.
36 *
37 * Drivers/subsystems handling devices in the PM domain needs to perform
38 * register context save/restore from their respective runtime PM
39 * callbacks, to be able to enable PM domain gating/ungating.
40 */
41 return 0;
42 }
43
44 static struct generic_pm_domain ux500_pm_domain_vape = {
45 .name = "VAPE",
46 .power_off = pd_power_off,
47 .power_on = pd_power_on,
48 };
49
50 static struct generic_pm_domain *ux500_pm_domains[NR_DOMAINS] = {
51 [DOMAIN_VAPE] = &ux500_pm_domain_vape,
52 };
53
54 static const struct of_device_id ux500_pm_domain_matches[] = {
55 { .compatible = "stericsson,ux500-pm-domains", },
56 { },
57 };
58
ux500_pm_domains_probe(struct platform_device * pdev)59 static int ux500_pm_domains_probe(struct platform_device *pdev)
60 {
61 struct device_node *np = pdev->dev.of_node;
62 struct genpd_onecell_data *genpd_data;
63 int i;
64
65 if (!np)
66 return -ENODEV;
67
68 genpd_data = kzalloc(sizeof(*genpd_data), GFP_KERNEL);
69 if (!genpd_data)
70 return -ENOMEM;
71
72 genpd_data->domains = ux500_pm_domains;
73 genpd_data->num_domains = ARRAY_SIZE(ux500_pm_domains);
74
75 for (i = 0; i < ARRAY_SIZE(ux500_pm_domains); ++i)
76 pm_genpd_init(ux500_pm_domains[i], NULL, false);
77
78 of_genpd_add_provider_onecell(np, genpd_data);
79 return 0;
80 }
81
82 static struct platform_driver ux500_pm_domains_driver = {
83 .probe = ux500_pm_domains_probe,
84 .driver = {
85 .name = "ux500_pm_domains",
86 .of_match_table = ux500_pm_domain_matches,
87 },
88 };
89
ux500_pm_domains_init(void)90 static int __init ux500_pm_domains_init(void)
91 {
92 return platform_driver_register(&ux500_pm_domains_driver);
93 }
94 arch_initcall(ux500_pm_domains_init);
95