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 <reset-uclass.h>
12 #include <linux/io.h>
13
14 struct mtmips_reset_priv {
15 void __iomem *base;
16 };
17
mtmips_reset_request(struct reset_ctl * reset_ctl)18 static int mtmips_reset_request(struct reset_ctl *reset_ctl)
19 {
20 return 0;
21 }
22
mtmips_reset_free(struct reset_ctl * reset_ctl)23 static int mtmips_reset_free(struct reset_ctl *reset_ctl)
24 {
25 return 0;
26 }
27
mtmips_reset_assert(struct reset_ctl * reset_ctl)28 static int mtmips_reset_assert(struct reset_ctl *reset_ctl)
29 {
30 struct mtmips_reset_priv *priv = dev_get_priv(reset_ctl->dev);
31
32 setbits_32(priv->base, BIT(reset_ctl->id));
33
34 return 0;
35 }
36
mtmips_reset_deassert(struct reset_ctl * reset_ctl)37 static int mtmips_reset_deassert(struct reset_ctl *reset_ctl)
38 {
39 struct mtmips_reset_priv *priv = dev_get_priv(reset_ctl->dev);
40
41 clrbits_32(priv->base, BIT(reset_ctl->id));
42
43 return 0;
44 }
45
46 static const struct reset_ops mtmips_reset_ops = {
47 .request = mtmips_reset_request,
48 .free = mtmips_reset_free,
49 .rst_assert = mtmips_reset_assert,
50 .rst_deassert = mtmips_reset_deassert,
51 };
52
mtmips_reset_probe(struct udevice * dev)53 static int mtmips_reset_probe(struct udevice *dev)
54 {
55 return 0;
56 }
57
mtmips_reset_ofdata_to_platdata(struct udevice * dev)58 static int mtmips_reset_ofdata_to_platdata(struct udevice *dev)
59 {
60 struct mtmips_reset_priv *priv = dev_get_priv(dev);
61
62 priv->base = (void __iomem *)dev_remap_addr_index(dev, 0);
63 if (!priv->base)
64 return -EINVAL;
65
66 return 0;
67 }
68
69 static const struct udevice_id mtmips_reset_ids[] = {
70 { .compatible = "mediatek,mtmips-reset" },
71 { }
72 };
73
74 U_BOOT_DRIVER(mtmips_reset) = {
75 .name = "mtmips-reset",
76 .id = UCLASS_RESET,
77 .of_match = mtmips_reset_ids,
78 .ofdata_to_platdata = mtmips_reset_ofdata_to_platdata,
79 .probe = mtmips_reset_probe,
80 .priv_auto_alloc_size = sizeof(struct mtmips_reset_priv),
81 .ops = &mtmips_reset_ops,
82 };
83