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