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 
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 
26 static int bcm6328_power_domain_free(struct power_domain *power_domain)
27 {
28 	return 0;
29 }
30 
31 static int bcm6328_power_domain_on(struct power_domain *power_domain)
32 {
33 	struct bcm6328_power_domain *priv = dev_get_priv(power_domain->dev);
34 
35 	clrbits_be32(priv->regs, BIT(power_domain->id));
36 
37 	return 0;
38 }
39 
40 static int bcm6328_power_domain_off(struct power_domain *power_domain)
41 {
42 	struct bcm6328_power_domain *priv = dev_get_priv(power_domain->dev);
43 
44 	setbits_be32(priv->regs, BIT(power_domain->id));
45 
46 	return 0;
47 }
48 
49 static int bcm6328_power_domain_probe(struct udevice *dev)
50 {
51 	struct bcm6328_power_domain *priv = dev_get_priv(dev);
52 	fdt_addr_t addr;
53 	fdt_size_t size;
54 
55 	addr = devfdt_get_addr_size_index(dev, 0, &size);
56 	if (addr == FDT_ADDR_T_NONE)
57 		return -EINVAL;
58 
59 	priv->regs = ioremap(addr, size);
60 
61 	return 0;
62 }
63 
64 static const struct udevice_id bcm6328_power_domain_ids[] = {
65 	{ .compatible = "brcm,bcm6328-power-domain" },
66 	{ /* sentinel */ }
67 };
68 
69 struct power_domain_ops bcm6328_power_domain_ops = {
70 	.free = bcm6328_power_domain_free,
71 	.off = bcm6328_power_domain_off,
72 	.on = bcm6328_power_domain_on,
73 	.request = bcm6328_power_domain_request,
74 };
75 
76 U_BOOT_DRIVER(bcm6328_power_domain) = {
77 	.name = "bcm6328_power_domain",
78 	.id = UCLASS_POWER_DOMAIN,
79 	.of_match = bcm6328_power_domain_ids,
80 	.ops = &bcm6328_power_domain_ops,
81 	.priv_auto_alloc_size = sizeof(struct bcm6328_power_domain),
82 	.probe = bcm6328_power_domain_probe,
83 };
84