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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / c597e248d9794ab40f68586bfa9e3596949df44b / . / drivers / reset / reset-mediatek.c
blob: e3614e6e2aef13e9cddbb779983b1fe4a4a21c80 [file] [log] [blame]
Weijie Gao3e066bc2018-12-20 16:12:51 +0800[diff] [blame]1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2018 MediaTek Inc.
4 *
5 * Author: Ryder Lee <ryder.lee@mediatek.com>
6 * Weijie Gao <weijie.gao@mediatek.com>
7 */
8
9#include <common.h>
10#include <dm.h>
11#include <dm/lists.h>
12#include <regmap.h>
13#include <reset-uclass.h>
14#include <syscon.h>
15
16struct mediatek_reset_priv {
17 struct regmap *regmap;
18 u32 regofs;
19 u32 nr_resets;
20};
21
22static int mediatek_reset_request(struct reset_ctl *reset_ctl)
23{
24 return 0;
25}
26
27static int mediatek_reset_free(struct reset_ctl *reset_ctl)
28{
29 return 0;
30}
31
32static int mediatek_reset_assert(struct reset_ctl *reset_ctl)
33{
34 struct mediatek_reset_priv *priv = dev_get_priv(reset_ctl->dev);
35 int id = reset_ctl->id;
36
37 if (id >= priv->nr_resets)
38 return -EINVAL;
39
40 return regmap_update_bits(priv->regmap,
41 priv->regofs + ((id / 32) << 2), BIT(id % 32), BIT(id % 32));
42}
43
44static int mediatek_reset_deassert(struct reset_ctl *reset_ctl)
45{
46 struct mediatek_reset_priv *priv = dev_get_priv(reset_ctl->dev);
47 int id = reset_ctl->id;
48
49 if (id >= priv->nr_resets)
50 return -EINVAL;
51
52 return regmap_update_bits(priv->regmap,
53 priv->regofs + ((id / 32) << 2), BIT(id % 32), 0);
54}
55
56struct reset_ops mediatek_reset_ops = {
57 .request = mediatek_reset_request,
58 .free = mediatek_reset_free,
59 .rst_assert = mediatek_reset_assert,
60 .rst_deassert = mediatek_reset_deassert,
61};
62
63static int mediatek_reset_probe(struct udevice *dev)
64{
65 struct mediatek_reset_priv *priv = dev_get_priv(dev);
66
67 if (!priv->regofs && !priv->nr_resets)
68 return -EINVAL;
69
70 priv->regmap = syscon_node_to_regmap(dev_ofnode(dev));
71 if (IS_ERR(priv->regmap))
72 return PTR_ERR(priv->regmap);
73
74 return 0;
75}
76
77int mediatek_reset_bind(struct udevice *pdev, u32 regofs, u32 num_regs)
78{
79 struct udevice *rst_dev;
80 struct mediatek_reset_priv *priv;
81 int ret;
82
83 ret = device_bind_driver_to_node(pdev, "mediatek_reset", "reset",
84 dev_ofnode(pdev), &rst_dev);
85 if (ret)
86 return ret;
87
88 priv = malloc(sizeof(struct mediatek_reset_priv));
89 priv->regofs = regofs;
90 priv->nr_resets = num_regs * 32;
91 rst_dev->priv = priv;
92
93 return 0;
94}
95
96U_BOOT_DRIVER(mediatek_reset) = {
97 .name = "mediatek_reset",
98 .id = UCLASS_RESET,
99 .probe = mediatek_reset_probe,
100 .ops = &mediatek_reset_ops,
101 .priv_auto_alloc_size = sizeof(struct mediatek_reset_priv),
102};