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
|
/*
* Copyright 2011 Tilera Corporation. 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
* as published by the Free Software Foundation, version 2.
*
* 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, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*
* Tilera-specific RTC driver.
*/
#include <linux/module.h>
#include <linux/device.h>
#include <linux/rtc.h>
#include <linux/platform_device.h>
/* Platform device pointer. */
static struct platform_device *tile_rtc_platform_device;
/*
* RTC read routine. Gets time info from RTC chip via hypervisor syscall.
*/
static int read_rtc_time(struct device *dev, struct rtc_time *tm)
{
HV_RTCTime hvtm = hv_get_rtc();
tm->tm_sec = hvtm.tm_sec;
tm->tm_min = hvtm.tm_min;
tm->tm_hour = hvtm.tm_hour;
tm->tm_mday = hvtm.tm_mday;
tm->tm_mon = hvtm.tm_mon;
tm->tm_year = hvtm.tm_year;
tm->tm_wday = 0;
tm->tm_yday = 0;
tm->tm_isdst = 0;
if (rtc_valid_tm(tm) < 0)
dev_warn(dev, "Read invalid date/time from RTC\n");
return 0;
}
/*
* RTC write routine. Sends time info to hypervisor via syscall, to be
* written to RTC chip.
*/
static int set_rtc_time(struct device *dev, struct rtc_time *tm)
{
HV_RTCTime hvtm;
hvtm.tm_sec = tm->tm_sec;
hvtm.tm_min = tm->tm_min;
hvtm.tm_hour = tm->tm_hour;
hvtm.tm_mday = tm->tm_mday;
hvtm.tm_mon = tm->tm_mon;
hvtm.tm_year = tm->tm_year;
hv_set_rtc(hvtm);
return 0;
}
/*
* RTC read/write ops.
*/
static const struct rtc_class_ops tile_rtc_ops = {
.read_time = read_rtc_time,
.set_time = set_rtc_time,
};
/*
* Device probe routine.
*/
static int tile_rtc_probe(struct platform_device *dev)
{
struct rtc_device *rtc;
rtc = devm_rtc_device_register(&dev->dev, "tile",
&tile_rtc_ops, THIS_MODULE);
if (IS_ERR(rtc))
return PTR_ERR(rtc);
platform_set_drvdata(dev, rtc);
return 0;
}
static struct platform_driver tile_rtc_platform_driver = {
.driver = {
.name = "rtc-tile",
},
.probe = tile_rtc_probe,
};
/*
* Driver init routine.
*/
static int __init tile_rtc_driver_init(void)
{
int err;
err = platform_driver_register(&tile_rtc_platform_driver);
if (err)
return err;
tile_rtc_platform_device = platform_device_alloc("rtc-tile", 0);
if (tile_rtc_platform_device == NULL) {
err = -ENOMEM;
goto exit_driver_unregister;
}
err = platform_device_add(tile_rtc_platform_device);
if (err)
goto exit_device_put;
return 0;
exit_device_put:
platform_device_put(tile_rtc_platform_device);
exit_driver_unregister:
platform_driver_unregister(&tile_rtc_platform_driver);
return err;
}
/*
* Driver cleanup routine.
*/
static void __exit tile_rtc_driver_exit(void)
{
platform_device_unregister(tile_rtc_platform_device);
platform_driver_unregister(&tile_rtc_platform_driver);
}
module_init(tile_rtc_driver_init);
module_exit(tile_rtc_driver_exit);
MODULE_DESCRIPTION("Tilera-specific Real Time Clock Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:rtc-tile");
|
