1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
4 */
5
6 #include <common.h>
7 #include <dm.h>
8 #include <power-domain-uclass.h>
9 #include <asm/io.h>
10
11 #define MAX_DOMAINS 32
12
13 struct bcm6328_power_domain {
14 void __iomem *regs;
15 };
16
bcm6328_power_domain_request(struct power_domain * power_domain)17 static int bcm6328_power_domain_request(struct power_domain *power_domain)
18 {
19 if (power_domain->id >= MAX_DOMAINS)
20 return -EINVAL;
21
22 return 0;
23 }
24
bcm6328_power_domain_free(struct power_domain * power_domain)25 static int bcm6328_power_domain_free(struct power_domain *power_domain)
26 {
27 return 0;
28 }
29
bcm6328_power_domain_on(struct power_domain * power_domain)30 static int bcm6328_power_domain_on(struct power_domain *power_domain)
31 {
32 struct bcm6328_power_domain *priv = dev_get_priv(power_domain->dev);
33
34 clrbits_be32(priv->regs, BIT(power_domain->id));
35
36 return 0;
37 }
38
bcm6328_power_domain_off(struct power_domain * power_domain)39 static int bcm6328_power_domain_off(struct power_domain *power_domain)
40 {
41 struct bcm6328_power_domain *priv = dev_get_priv(power_domain->dev);
42
43 setbits_be32(priv->regs, BIT(power_domain->id));
44
45 return 0;
46 }
47
bcm6328_power_domain_probe(struct udevice * dev)48 static int bcm6328_power_domain_probe(struct udevice *dev)
49 {
50 struct bcm6328_power_domain *priv = dev_get_priv(dev);
51
52 priv->regs = dev_remap_addr(dev);
53 if (!priv->regs)
54 return -EINVAL;
55
56 return 0;
57 }
58
59 static const struct udevice_id bcm6328_power_domain_ids[] = {
60 { .compatible = "brcm,bcm6328-power-domain" },
61 { /* sentinel */ }
62 };
63
64 struct power_domain_ops bcm6328_power_domain_ops = {
65 .free = bcm6328_power_domain_free,
66 .off = bcm6328_power_domain_off,
67 .on = bcm6328_power_domain_on,
68 .request = bcm6328_power_domain_request,
69 };
70
71 U_BOOT_DRIVER(bcm6328_power_domain) = {
72 .name = "bcm6328_power_domain",
73 .id = UCLASS_POWER_DOMAIN,
74 .of_match = bcm6328_power_domain_ids,
75 .ops = &bcm6328_power_domain_ops,
76 .priv_auto_alloc_size = sizeof(struct bcm6328_power_domain),
77 .probe = bcm6328_power_domain_probe,
78 };
79