1 /*
2  * Copyright (C) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
3  *
4  * Derived from linux/arch/mips/bcm63xx/reset.c:
5  *	Copyright (C) 2012 Jonas Gorski <jonas.gorski@gmail.com>
6  *
7  * SPDX-License-Identifier:	GPL-2.0+
8  */
9 
10 #include <common.h>
11 #include <dm.h>
12 #include <errno.h>
13 #include <reset-uclass.h>
14 #include <asm/io.h>
15 
16 #define MAX_RESETS	32
17 
18 struct bcm6345_reset_priv {
19 	void __iomem *regs;
20 };
21 
22 static int bcm6345_reset_assert(struct reset_ctl *rst)
23 {
24 	struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev);
25 
26 	clrbits_be32(priv->regs, BIT(rst->id));
27 	mdelay(20);
28 
29 	return 0;
30 }
31 
32 static int bcm6345_reset_deassert(struct reset_ctl *rst)
33 {
34 	struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev);
35 
36 	setbits_be32(priv->regs, BIT(rst->id));
37 	mdelay(20);
38 
39 	return 0;
40 }
41 
42 static int bcm6345_reset_free(struct reset_ctl *rst)
43 {
44 	return 0;
45 }
46 
47 static int bcm6345_reset_request(struct reset_ctl *rst)
48 {
49 	if (rst->id >= MAX_RESETS)
50 		return -EINVAL;
51 
52 	return bcm6345_reset_assert(rst);
53 }
54 
55 struct reset_ops bcm6345_reset_reset_ops = {
56 	.free = bcm6345_reset_free,
57 	.request = bcm6345_reset_request,
58 	.rst_assert = bcm6345_reset_assert,
59 	.rst_deassert = bcm6345_reset_deassert,
60 };
61 
62 static const struct udevice_id bcm6345_reset_ids[] = {
63 	{ .compatible = "brcm,bcm6345-reset" },
64 	{ /* sentinel */ }
65 };
66 
67 static int bcm6345_reset_probe(struct udevice *dev)
68 {
69 	struct bcm6345_reset_priv *priv = dev_get_priv(dev);
70 	fdt_addr_t addr;
71 	fdt_size_t size;
72 
73 	addr = devfdt_get_addr_size_index(dev, 0, &size);
74 	if (addr == FDT_ADDR_T_NONE)
75 		return -EINVAL;
76 
77 	priv->regs = ioremap(addr, size);
78 
79 	return 0;
80 }
81 
82 U_BOOT_DRIVER(bcm6345_reset) = {
83 	.name = "bcm6345-reset",
84 	.id = UCLASS_RESET,
85 	.of_match = bcm6345_reset_ids,
86 	.ops = &bcm6345_reset_reset_ops,
87 	.probe = bcm6345_reset_probe,
88 	.priv_auto_alloc_size = sizeof(struct bcm6345_reset_priv),
89 };
90