1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Reset driver for the StarFive JH7110 SoC
4  *
5  * Copyright (C) 2022 StarFive Technology Co., Ltd.
6  */
7 
8 #include <linux/auxiliary_bus.h>
9 
10 #include <soc/starfive/reset-starfive-jh71x0.h>
11 
12 #include "reset-starfive-jh71x0.h"
13 
14 #include <dt-bindings/reset/starfive,jh7110-crg.h>
15 
16 struct jh7110_reset_info {
17 	unsigned int nr_resets;
18 	unsigned int assert_offset;
19 	unsigned int status_offset;
20 };
21 
22 static const struct jh7110_reset_info jh7110_sys_info = {
23 	.nr_resets = JH7110_SYSRST_END,
24 	.assert_offset = 0x2F8,
25 	.status_offset = 0x308,
26 };
27 
28 static const struct jh7110_reset_info jh7110_aon_info = {
29 	.nr_resets = JH7110_AONRST_END,
30 	.assert_offset = 0x38,
31 	.status_offset = 0x3C,
32 };
33 
34 static int jh7110_reset_probe(struct auxiliary_device *adev,
35 			      const struct auxiliary_device_id *id)
36 {
37 	struct jh7110_reset_info *info = (struct jh7110_reset_info *)(id->driver_data);
38 	struct jh71x0_reset_adev *rdev = to_jh71x0_reset_adev(adev);
39 	void __iomem *base = rdev->base;
40 
41 	if (!info || !base)
42 		return -ENODEV;
43 
44 	return reset_starfive_jh71x0_register(&adev->dev, adev->dev.parent->of_node,
45 					      base + info->assert_offset,
46 					      base + info->status_offset,
47 					      NULL,
48 					      info->nr_resets,
49 					      NULL);
50 }
51 
52 static const struct auxiliary_device_id jh7110_reset_ids[] = {
53 	{
54 		.name = "clk_starfive_jh7110_sys.rst-sys",
55 		.driver_data = (kernel_ulong_t)&jh7110_sys_info,
56 	},
57 	{
58 		.name = "clk_starfive_jh7110_sys.rst-aon",
59 		.driver_data = (kernel_ulong_t)&jh7110_aon_info,
60 	},
61 	{ /* sentinel */ }
62 };
63 MODULE_DEVICE_TABLE(auxiliary, jh7110_reset_ids);
64 
65 static struct auxiliary_driver jh7110_reset_driver = {
66 	.probe		= jh7110_reset_probe,
67 	.id_table	= jh7110_reset_ids,
68 };
69 module_auxiliary_driver(jh7110_reset_driver);
70 
71 MODULE_AUTHOR("Hal Feng <hal.feng@starfivetech.com>");
72 MODULE_DESCRIPTION("StarFive JH7110 reset driver");
73 MODULE_LICENSE("GPL");
74