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
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
// SPDX-License-Identifier: GPL-2.0
/*
* Spreadtrum hardware spinlock driver
* Copyright (C) 2017 Spreadtrum - http://www.spreadtrum.com
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/hwspinlock.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include "hwspinlock_internal.h"
/* hwspinlock registers definition */
#define HWSPINLOCK_RECCTRL 0x4
#define HWSPINLOCK_MASTERID(_X_) (0x80 + 0x4 * (_X_))
#define HWSPINLOCK_TOKEN(_X_) (0x800 + 0x4 * (_X_))
/* unlocked value */
#define HWSPINLOCK_NOTTAKEN 0x55aa10c5
/* bits definition of RECCTRL reg */
#define HWSPINLOCK_USER_BITS 0x1
/* hwspinlock number */
#define SPRD_HWLOCKS_NUM 32
struct sprd_hwspinlock_dev {
void __iomem *base;
struct clk *clk;
struct hwspinlock_device bank;
};
/* try to lock the hardware spinlock */
static int sprd_hwspinlock_trylock(struct hwspinlock *lock)
{
struct sprd_hwspinlock_dev *sprd_hwlock =
dev_get_drvdata(lock->bank->dev);
void __iomem *addr = lock->priv;
int user_id, lock_id;
if (!readl(addr))
return 1;
lock_id = hwlock_to_id(lock);
/* get the hardware spinlock master/user id */
user_id = readl(sprd_hwlock->base + HWSPINLOCK_MASTERID(lock_id));
dev_warn(sprd_hwlock->bank.dev,
"hwspinlock [%d] lock failed and master/user id = %d!\n",
lock_id, user_id);
return 0;
}
/* unlock the hardware spinlock */
static void sprd_hwspinlock_unlock(struct hwspinlock *lock)
{
void __iomem *lock_addr = lock->priv;
writel(HWSPINLOCK_NOTTAKEN, lock_addr);
}
/* The specs recommended below number as the retry delay time */
static void sprd_hwspinlock_relax(struct hwspinlock *lock)
{
ndelay(10);
}
static const struct hwspinlock_ops sprd_hwspinlock_ops = {
.trylock = sprd_hwspinlock_trylock,
.unlock = sprd_hwspinlock_unlock,
.relax = sprd_hwspinlock_relax,
};
static void sprd_hwspinlock_disable(void *data)
{
struct sprd_hwspinlock_dev *sprd_hwlock = data;
clk_disable_unprepare(sprd_hwlock->clk);
}
static int sprd_hwspinlock_probe(struct platform_device *pdev)
{
struct sprd_hwspinlock_dev *sprd_hwlock;
struct hwspinlock *lock;
int i, ret;
if (!pdev->dev.of_node)
return -ENODEV;
sprd_hwlock = devm_kzalloc(&pdev->dev,
struct_size(sprd_hwlock, bank.lock, SPRD_HWLOCKS_NUM),
GFP_KERNEL);
if (!sprd_hwlock)
return -ENOMEM;
sprd_hwlock->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(sprd_hwlock->base))
return PTR_ERR(sprd_hwlock->base);
sprd_hwlock->clk = devm_clk_get(&pdev->dev, "enable");
if (IS_ERR(sprd_hwlock->clk)) {
dev_err(&pdev->dev, "get hwspinlock clock failed!\n");
return PTR_ERR(sprd_hwlock->clk);
}
ret = clk_prepare_enable(sprd_hwlock->clk);
if (ret)
return ret;
ret = devm_add_action_or_reset(&pdev->dev, sprd_hwspinlock_disable,
sprd_hwlock);
if (ret) {
dev_err(&pdev->dev,
"Failed to add hwspinlock disable action\n");
return ret;
}
/* set the hwspinlock to record user id to identify subsystems */
writel(HWSPINLOCK_USER_BITS, sprd_hwlock->base + HWSPINLOCK_RECCTRL);
for (i = 0; i < SPRD_HWLOCKS_NUM; i++) {
lock = &sprd_hwlock->bank.lock[i];
lock->priv = sprd_hwlock->base + HWSPINLOCK_TOKEN(i);
}
platform_set_drvdata(pdev, sprd_hwlock);
return devm_hwspin_lock_register(&pdev->dev, &sprd_hwlock->bank,
&sprd_hwspinlock_ops, 0,
SPRD_HWLOCKS_NUM);
}
static const struct of_device_id sprd_hwspinlock_of_match[] = {
{ .compatible = "sprd,hwspinlock-r3p0", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, sprd_hwspinlock_of_match);
static struct platform_driver sprd_hwspinlock_driver = {
.probe = sprd_hwspinlock_probe,
.driver = {
.name = "sprd_hwspinlock",
.of_match_table = sprd_hwspinlock_of_match,
},
};
module_platform_driver(sprd_hwspinlock_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Hardware spinlock driver for Spreadtrum");
MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");
MODULE_AUTHOR("Lanqing Liu <lanqing.liu@spreadtrum.com>");
MODULE_AUTHOR("Long Cheng <aiden.cheng@spreadtrum.com>");
|
