1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
/*
* Hisilicon Hi6220 reset controller driver
*
* Copyright (c) 2016 Linaro Limited.
* Copyright (c) 2015-2016 Hisilicon Limited.
*
* Author: Feng Chen <puck.chen@hisilicon.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/io.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/bitops.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#include <linux/reset-controller.h>
#include <linux/reset.h>
#include <linux/platform_device.h>
#define PERIPH_ASSERT_OFFSET 0x300
#define PERIPH_DEASSERT_OFFSET 0x304
#define PERIPH_MAX_INDEX 0x509
#define to_reset_data(x) container_of(x, struct hi6220_reset_data, rc_dev)
struct hi6220_reset_data {
struct reset_controller_dev rc_dev;
struct regmap *regmap;
};
static int hi6220_peripheral_assert(struct reset_controller_dev *rc_dev,
unsigned long idx)
{
struct hi6220_reset_data *data = to_reset_data(rc_dev);
struct regmap *regmap = data->regmap;
u32 bank = idx >> 8;
u32 offset = idx & 0xff;
u32 reg = PERIPH_ASSERT_OFFSET + bank * 0x10;
return regmap_write(regmap, reg, BIT(offset));
}
static int hi6220_peripheral_deassert(struct reset_controller_dev *rc_dev,
unsigned long idx)
{
struct hi6220_reset_data *data = to_reset_data(rc_dev);
struct regmap *regmap = data->regmap;
u32 bank = idx >> 8;
u32 offset = idx & 0xff;
u32 reg = PERIPH_DEASSERT_OFFSET + bank * 0x10;
return regmap_write(regmap, reg, BIT(offset));
}
static const struct reset_control_ops hi6220_peripheral_reset_ops = {
.assert = hi6220_peripheral_assert,
.deassert = hi6220_peripheral_deassert,
};
static int hi6220_reset_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct device *dev = &pdev->dev;
struct hi6220_reset_data *data;
struct regmap *regmap;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
regmap = syscon_node_to_regmap(np);
if (IS_ERR(regmap)) {
dev_err(dev, "failed to get reset controller regmap\n");
return PTR_ERR(regmap);
}
data->regmap = regmap;
data->rc_dev.of_node = np;
data->rc_dev.ops = &hi6220_peripheral_reset_ops;
data->rc_dev.nr_resets = PERIPH_MAX_INDEX;
return reset_controller_register(&data->rc_dev);
}
static const struct of_device_id hi6220_reset_match[] = {
{
.compatible = "hisilicon,hi6220-sysctrl",
},
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, hi6220_reset_match);
static struct platform_driver hi6220_reset_driver = {
.probe = hi6220_reset_probe,
.driver = {
.name = "reset-hi6220",
.of_match_table = hi6220_reset_match,
},
};
static int __init hi6220_reset_init(void)
{
return platform_driver_register(&hi6220_reset_driver);
}
postcore_initcall(hi6220_reset_init);
|
