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
|
/*
* Copyright (c) 2016, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/reset-controller.h>
#include "reset.h"
static int msm_reset(struct reset_controller_dev *rcdev, unsigned long id)
{
rcdev->ops->assert(rcdev, id);
udelay(1);
rcdev->ops->deassert(rcdev, id);
return 0;
}
static int
msm_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)
{
struct msm_reset_controller *rst;
const struct msm_reset_map *map;
u32 regval;
rst = to_msm_reset_controller(rcdev);
map = &rst->reset_map[id];
regval = readl_relaxed(rst->base + map->reg);
regval |= BIT(map->bit);
writel_relaxed(regval, rst->base + map->reg);
/* Make sure the reset is asserted */
mb();
return 0;
}
static int
msm_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)
{
struct msm_reset_controller *rst;
const struct msm_reset_map *map;
u32 regval;
rst = to_msm_reset_controller(rcdev);
map = &rst->reset_map[id];
regval = readl_relaxed(rst->base + map->reg);
regval &= ~BIT(map->bit);
writel_relaxed(regval, rst->base + map->reg);
/* Make sure the reset is de-asserted */
mb();
return 0;
}
struct reset_control_ops msm_reset_ops = {
.reset = msm_reset,
.assert = msm_reset_assert,
.deassert = msm_reset_deassert,
};
EXPORT_SYMBOL_GPL(msm_reset_ops);
int msm_reset_controller_register(struct platform_device *pdev,
const struct msm_reset_map *map, unsigned int num_resets,
void __iomem *virt_base)
{
struct msm_reset_controller *reset;
int ret = 0;
reset = devm_kzalloc(&pdev->dev, sizeof(*reset), GFP_KERNEL);
if (!reset)
return -ENOMEM;
reset->rcdev.of_node = pdev->dev.of_node;
reset->rcdev.ops = &msm_reset_ops;
reset->rcdev.owner = pdev->dev.driver->owner;
reset->rcdev.nr_resets = num_resets;
reset->reset_map = map;
reset->base = virt_base;
ret = reset_controller_register(&reset->rcdev);
if (ret)
dev_err(&pdev->dev, "Failed to register with reset controller\n");
return ret;
}
EXPORT_SYMBOL_GPL(msm_reset_controller_register);
|
