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
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
*/
#include <common.h>
#include <dm.h>
#include <dm/lists.h>
#include <dm/device-internal.h>
#include <dm/root.h>
#include <clk.h>
#include <errno.h>
#include <timer.h>
DECLARE_GLOBAL_DATA_PTR;
/*
* Implement a timer uclass to work with lib/time.c. The timer is usually
* a 32/64 bits free-running up counter. The get_rate() method is used to get
* the input clock frequency of the timer. The get_count() method is used
* to get the current 64 bits count value. If the hardware is counting down,
* the value should be inversed inside the method. There may be no real
* tick, and no timer interrupt.
*/
int notrace timer_get_count(struct udevice *dev, u64 *count)
{
const struct timer_ops *ops = device_get_ops(dev);
if (!ops->get_count)
return -ENOSYS;
return ops->get_count(dev, count);
}
unsigned long notrace timer_get_rate(struct udevice *dev)
{
struct timer_dev_priv *uc_priv = dev->uclass_priv;
return uc_priv->clock_rate;
}
static int timer_pre_probe(struct udevice *dev)
{
#if !CONFIG_IS_ENABLED(OF_PLATDATA)
struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct clk timer_clk;
int err;
ulong ret;
err = clk_get_by_index(dev, 0, &timer_clk);
if (!err) {
ret = clk_get_rate(&timer_clk);
if (IS_ERR_VALUE(ret))
return ret;
uc_priv->clock_rate = ret;
} else {
uc_priv->clock_rate =
dev_read_u32_default(dev, "clock-frequency", 0);
}
#endif
return 0;
}
static int timer_post_probe(struct udevice *dev)
{
struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
if (!uc_priv->clock_rate)
return -EINVAL;
return 0;
}
u64 timer_conv_64(u32 count)
{
/* increment tbh if tbl has rolled over */
if (count < gd->timebase_l)
gd->timebase_h++;
gd->timebase_l = count;
return ((u64)gd->timebase_h << 32) | gd->timebase_l;
}
int notrace dm_timer_init(void)
{
struct udevice *dev = NULL;
__maybe_unused ofnode node;
int ret;
if (gd->timer)
return 0;
/*
* Directly access gd->dm_root to suppress error messages, if the
* virtual root driver does not yet exist.
*/
if (gd->dm_root == NULL)
return -EAGAIN;
#if !CONFIG_IS_ENABLED(OF_PLATDATA)
/* Check for a chosen timer to be used for tick */
node = ofnode_get_chosen_node("tick-timer");
if (ofnode_valid(node) &&
uclass_get_device_by_ofnode(UCLASS_TIMER, node, &dev)) {
/*
* If the timer is not marked to be bound before
* relocation, bind it anyway.
*/
if (!lists_bind_fdt(dm_root(), node, &dev, false)) {
ret = device_probe(dev);
if (ret)
return ret;
}
}
#endif
if (!dev) {
/* Fall back to the first available timer */
ret = uclass_first_device_err(UCLASS_TIMER, &dev);
if (ret)
return ret;
}
if (dev) {
gd->timer = dev;
return 0;
}
return -ENODEV;
}
UCLASS_DRIVER(timer) = {
.id = UCLASS_TIMER,
.name = "timer",
.pre_probe = timer_pre_probe,
.flags = DM_UC_FLAG_SEQ_ALIAS,
.post_probe = timer_post_probe,
.per_device_auto_alloc_size = sizeof(struct timer_dev_priv),
};
|
