1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2019 MediaTek Inc. All Rights Reserved.
4 *
5 * Author: Weijie Gao <weijie.gao@mediatek.com>
6 */
7
8#include <common.h>
9#include <dm.h>
10#include <errno.h>
11#include <log.h>
12#include <malloc.h>
13#include <reset-uclass.h>
14#include <linux/bitops.h>
15#include <linux/io.h>
16
17struct mtmips_reset_priv {
18	void __iomem *base;
19};
20
21static int mtmips_reset_assert(struct reset_ctl *reset_ctl)
22{
23	struct mtmips_reset_priv *priv = dev_get_priv(reset_ctl->dev);
24
25	setbits_32(priv->base, BIT(reset_ctl->id));
26
27	return 0;
28}
29
30static int mtmips_reset_deassert(struct reset_ctl *reset_ctl)
31{
32	struct mtmips_reset_priv *priv = dev_get_priv(reset_ctl->dev);
33
34	clrbits_32(priv->base, BIT(reset_ctl->id));
35
36	return 0;
37}
38
39static const struct reset_ops mtmips_reset_ops = {
40	.rst_assert	= mtmips_reset_assert,
41	.rst_deassert	= mtmips_reset_deassert,
42};
43
44static int mtmips_reset_probe(struct udevice *dev)
45{
46	return 0;
47}
48
49static int mtmips_reset_of_to_plat(struct udevice *dev)
50{
51	struct mtmips_reset_priv *priv = dev_get_priv(dev);
52
53	priv->base = (void __iomem *)dev_remap_addr_index(dev, 0);
54	if (!priv->base)
55		return -EINVAL;
56
57	return 0;
58}
59
60static const struct udevice_id mtmips_reset_ids[] = {
61	{ .compatible = "mediatek,mtmips-reset" },
62	{ }
63};
64
65U_BOOT_DRIVER(mtmips_reset) = {
66	.name = "mtmips-reset",
67	.id = UCLASS_RESET,
68	.of_match = mtmips_reset_ids,
69	.of_to_plat = mtmips_reset_of_to_plat,
70	.probe = mtmips_reset_probe,
71	.priv_auto	= sizeof(struct mtmips_reset_priv),
72	.ops = &mtmips_reset_ops,
73	.flags = DM_FLAG_PRE_RELOC,
74};
75