1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2018 MediaTek Inc.
5 * Author: Ryder Lee <ryder.lee@mediatek.com>
6 * Weijie Gao <weijie.gao@mediatek.com>
15 #include <reset-uclass.h>
17 #include <dm/device-internal.h>
18 #include <linux/bitops.h>
19 #include <linux/err.h>
21 struct mediatek_reset_priv {
22 struct regmap *regmap;
27 static int mediatek_reset_assert(struct reset_ctl *reset_ctl)
29 struct mediatek_reset_priv *priv = dev_get_priv(reset_ctl->dev);
30 int id = reset_ctl->id;
32 if (id >= priv->nr_resets)
35 return regmap_update_bits(priv->regmap,
36 priv->regofs + ((id / 32) << 2), BIT(id % 32), BIT(id % 32));
39 static int mediatek_reset_deassert(struct reset_ctl *reset_ctl)
41 struct mediatek_reset_priv *priv = dev_get_priv(reset_ctl->dev);
42 int id = reset_ctl->id;
44 if (id >= priv->nr_resets)
47 return regmap_update_bits(priv->regmap,
48 priv->regofs + ((id / 32) << 2), BIT(id % 32), 0);
51 struct reset_ops mediatek_reset_ops = {
52 .rst_assert = mediatek_reset_assert,
53 .rst_deassert = mediatek_reset_deassert,
56 static int mediatek_reset_probe(struct udevice *dev)
58 struct mediatek_reset_priv *priv = dev_get_priv(dev);
60 if (!priv->regofs && !priv->nr_resets)
63 priv->regmap = syscon_node_to_regmap(dev_ofnode(dev));
64 if (IS_ERR(priv->regmap))
65 return PTR_ERR(priv->regmap);
70 int mediatek_reset_bind(struct udevice *pdev, u32 regofs, u32 num_regs)
72 struct udevice *rst_dev;
73 struct mediatek_reset_priv *priv;
76 ret = device_bind_driver_to_node(pdev, "mediatek_reset", "reset",
77 dev_ofnode(pdev), &rst_dev);
81 priv = malloc(sizeof(struct mediatek_reset_priv));
85 priv->regofs = regofs;
86 priv->nr_resets = num_regs * 32;
87 dev_set_priv(rst_dev, priv);
92 U_BOOT_DRIVER(mediatek_reset) = {
93 .name = "mediatek_reset",
95 .probe = mediatek_reset_probe,
96 .ops = &mediatek_reset_ops,
97 .priv_auto = sizeof(struct mediatek_reset_priv),