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 const struct jh7110_reset_info jh7110_stg_info = {
35 .nr_resets = JH7110_STGRST_END,
36 .assert_offset = 0x74,
37 .status_offset = 0x78,
38 };
39
40 static const struct jh7110_reset_info jh7110_isp_info = {
41 .nr_resets = JH7110_ISPRST_END,
42 .assert_offset = 0x38,
43 .status_offset = 0x3C,
44 };
45
46 static const struct jh7110_reset_info jh7110_vout_info = {
47 .nr_resets = JH7110_VOUTRST_END,
48 .assert_offset = 0x48,
49 .status_offset = 0x4C,
50 };
51
jh7110_reset_probe(struct auxiliary_device * adev,const struct auxiliary_device_id * id)52 static int jh7110_reset_probe(struct auxiliary_device *adev,
53 const struct auxiliary_device_id *id)
54 {
55 struct jh7110_reset_info *info = (struct jh7110_reset_info *)(id->driver_data);
56 struct jh71x0_reset_adev *rdev = to_jh71x0_reset_adev(adev);
57 void __iomem *base = rdev->base;
58
59 if (!info || !base)
60 return -ENODEV;
61
62 return reset_starfive_jh71x0_register(&adev->dev, adev->dev.parent->of_node,
63 base + info->assert_offset,
64 base + info->status_offset,
65 NULL,
66 info->nr_resets,
67 NULL);
68 }
69
70 static const struct auxiliary_device_id jh7110_reset_ids[] = {
71 {
72 .name = "clk_starfive_jh7110_sys.rst-sys",
73 .driver_data = (kernel_ulong_t)&jh7110_sys_info,
74 },
75 {
76 .name = "clk_starfive_jh7110_sys.rst-aon",
77 .driver_data = (kernel_ulong_t)&jh7110_aon_info,
78 },
79 {
80 .name = "clk_starfive_jh7110_sys.rst-stg",
81 .driver_data = (kernel_ulong_t)&jh7110_stg_info,
82 },
83 {
84 .name = "clk_starfive_jh7110_sys.rst-isp",
85 .driver_data = (kernel_ulong_t)&jh7110_isp_info,
86 },
87 {
88 .name = "clk_starfive_jh7110_sys.rst-vo",
89 .driver_data = (kernel_ulong_t)&jh7110_vout_info,
90 },
91 { /* sentinel */ }
92 };
93 MODULE_DEVICE_TABLE(auxiliary, jh7110_reset_ids);
94
95 static struct auxiliary_driver jh7110_reset_driver = {
96 .probe = jh7110_reset_probe,
97 .id_table = jh7110_reset_ids,
98 };
99 module_auxiliary_driver(jh7110_reset_driver);
100
101 MODULE_AUTHOR("Hal Feng <hal.feng@starfivetech.com>");
102 MODULE_DESCRIPTION("StarFive JH7110 reset driver");
103 MODULE_LICENSE("GPL");
104