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