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_request(struct reset_ctl *reset_ctl)
32 static int mediatek_reset_free(struct reset_ctl *reset_ctl)
37 static int mediatek_reset_assert(struct reset_ctl *reset_ctl)
39 struct mediatek_reset_priv *priv = dev_get_priv(reset_ctl->dev);
40 int id = reset_ctl->id;
42 if (id >= priv->nr_resets)
45 return regmap_update_bits(priv->regmap,
46 priv->regofs + ((id / 32) << 2), BIT(id % 32), BIT(id % 32));
49 static int mediatek_reset_deassert(struct reset_ctl *reset_ctl)
51 struct mediatek_reset_priv *priv = dev_get_priv(reset_ctl->dev);
52 int id = reset_ctl->id;
54 if (id >= priv->nr_resets)
57 return regmap_update_bits(priv->regmap,
58 priv->regofs + ((id / 32) << 2), BIT(id % 32), 0);
61 struct reset_ops mediatek_reset_ops = {
62 .request = mediatek_reset_request,
63 .rfree = mediatek_reset_free,
64 .rst_assert = mediatek_reset_assert,
65 .rst_deassert = mediatek_reset_deassert,
68 static int mediatek_reset_probe(struct udevice *dev)
70 struct mediatek_reset_priv *priv = dev_get_priv(dev);
72 if (!priv->regofs && !priv->nr_resets)
75 priv->regmap = syscon_node_to_regmap(dev_ofnode(dev));
76 if (IS_ERR(priv->regmap))
77 return PTR_ERR(priv->regmap);
82 int mediatek_reset_bind(struct udevice *pdev, u32 regofs, u32 num_regs)
84 struct udevice *rst_dev;
85 struct mediatek_reset_priv *priv;
88 ret = device_bind_driver_to_node(pdev, "mediatek_reset", "reset",
89 dev_ofnode(pdev), &rst_dev);
93 priv = malloc(sizeof(struct mediatek_reset_priv));
94 priv->regofs = regofs;
95 priv->nr_resets = num_regs * 32;
96 dev_set_priv(rst_dev, priv);
101 U_BOOT_DRIVER(mediatek_reset) = {
102 .name = "mediatek_reset",
104 .probe = mediatek_reset_probe,
105 .ops = &mediatek_reset_ops,
106 .priv_auto = sizeof(struct mediatek_reset_priv),