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>
14 #include <reset-uclass.h>
16 #include <linux/err.h>
18 struct mediatek_reset_priv {
19 struct regmap *regmap;
24 static int mediatek_reset_request(struct reset_ctl *reset_ctl)
29 static int mediatek_reset_free(struct reset_ctl *reset_ctl)
34 static int mediatek_reset_assert(struct reset_ctl *reset_ctl)
36 struct mediatek_reset_priv *priv = dev_get_priv(reset_ctl->dev);
37 int id = reset_ctl->id;
39 if (id >= priv->nr_resets)
42 return regmap_update_bits(priv->regmap,
43 priv->regofs + ((id / 32) << 2), BIT(id % 32), BIT(id % 32));
46 static int mediatek_reset_deassert(struct reset_ctl *reset_ctl)
48 struct mediatek_reset_priv *priv = dev_get_priv(reset_ctl->dev);
49 int id = reset_ctl->id;
51 if (id >= priv->nr_resets)
54 return regmap_update_bits(priv->regmap,
55 priv->regofs + ((id / 32) << 2), BIT(id % 32), 0);
58 struct reset_ops mediatek_reset_ops = {
59 .request = mediatek_reset_request,
60 .rfree = mediatek_reset_free,
61 .rst_assert = mediatek_reset_assert,
62 .rst_deassert = mediatek_reset_deassert,
65 static int mediatek_reset_probe(struct udevice *dev)
67 struct mediatek_reset_priv *priv = dev_get_priv(dev);
69 if (!priv->regofs && !priv->nr_resets)
72 priv->regmap = syscon_node_to_regmap(dev_ofnode(dev));
73 if (IS_ERR(priv->regmap))
74 return PTR_ERR(priv->regmap);
79 int mediatek_reset_bind(struct udevice *pdev, u32 regofs, u32 num_regs)
81 struct udevice *rst_dev;
82 struct mediatek_reset_priv *priv;
85 ret = device_bind_driver_to_node(pdev, "mediatek_reset", "reset",
86 dev_ofnode(pdev), &rst_dev);
90 priv = malloc(sizeof(struct mediatek_reset_priv));
91 priv->regofs = regofs;
92 priv->nr_resets = num_regs * 32;
98 U_BOOT_DRIVER(mediatek_reset) = {
99 .name = "mediatek_reset",
101 .probe = mediatek_reset_probe,
102 .ops = &mediatek_reset_ops,
103 .priv_auto_alloc_size = sizeof(struct mediatek_reset_priv),