Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Copyright 2011 Tilera Corporation. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
12 * more details.
13 *
14 * Tilera-specific RTC driver.
15 */
16
17#include <linux/module.h>
18#include <linux/device.h>
19#include <linux/rtc.h>
20#include <linux/platform_device.h>
21
22/* Platform device pointer. */
23static struct platform_device *tile_rtc_platform_device;
24
25/*
26 * RTC read routine. Gets time info from RTC chip via hypervisor syscall.
27 */
28static int read_rtc_time(struct device *dev, struct rtc_time *tm)
29{
30 HV_RTCTime hvtm = hv_get_rtc();
31
32 tm->tm_sec = hvtm.tm_sec;
33 tm->tm_min = hvtm.tm_min;
34 tm->tm_hour = hvtm.tm_hour;
35 tm->tm_mday = hvtm.tm_mday;
36 tm->tm_mon = hvtm.tm_mon;
37 tm->tm_year = hvtm.tm_year;
38 tm->tm_wday = 0;
39 tm->tm_yday = 0;
40 tm->tm_isdst = 0;
41
42 if (rtc_valid_tm(tm) < 0)
43 dev_warn(dev, "Read invalid date/time from RTC\n");
44
45 return 0;
46}
47
48/*
49 * RTC write routine. Sends time info to hypervisor via syscall, to be
50 * written to RTC chip.
51 */
52static int set_rtc_time(struct device *dev, struct rtc_time *tm)
53{
54 HV_RTCTime hvtm;
55
56 hvtm.tm_sec = tm->tm_sec;
57 hvtm.tm_min = tm->tm_min;
58 hvtm.tm_hour = tm->tm_hour;
59 hvtm.tm_mday = tm->tm_mday;
60 hvtm.tm_mon = tm->tm_mon;
61 hvtm.tm_year = tm->tm_year;
62
63 hv_set_rtc(hvtm);
64
65 return 0;
66}
67
68/*
69 * RTC read/write ops.
70 */
71static const struct rtc_class_ops tile_rtc_ops = {
72 .read_time = read_rtc_time,
73 .set_time = set_rtc_time,
74};
75
76/*
77 * Device probe routine.
78 */
79static int tile_rtc_probe(struct platform_device *dev)
80{
81 struct rtc_device *rtc;
82
83 rtc = rtc_device_register("tile",
84 &dev->dev, &tile_rtc_ops, THIS_MODULE);
85
86 if (IS_ERR(rtc))
87 return PTR_ERR(rtc);
88
89 platform_set_drvdata(dev, rtc);
90
91 return 0;
92}
93
94/*
95 * Device cleanup routine.
96 */
97static int tile_rtc_remove(struct platform_device *dev)
98{
99 struct rtc_device *rtc = platform_get_drvdata(dev);
100
101 if (rtc)
102 rtc_device_unregister(rtc);
103
104 platform_set_drvdata(dev, NULL);
105
106 return 0;
107}
108
109static struct platform_driver tile_rtc_platform_driver = {
110 .driver = {
111 .name = "rtc-tile",
112 .owner = THIS_MODULE,
113 },
114 .probe = tile_rtc_probe,
115 .remove = tile_rtc_remove,
116};
117
118/*
119 * Driver init routine.
120 */
121static int __init tile_rtc_driver_init(void)
122{
123 int err;
124
125 err = platform_driver_register(&tile_rtc_platform_driver);
126 if (err)
127 return err;
128
129 tile_rtc_platform_device = platform_device_alloc("rtc-tile", 0);
130 if (tile_rtc_platform_device == NULL) {
131 err = -ENOMEM;
132 goto exit_driver_unregister;
133 }
134
135 err = platform_device_add(tile_rtc_platform_device);
136 if (err)
137 goto exit_device_put;
138
139 return 0;
140
141exit_device_put:
142 platform_device_put(tile_rtc_platform_device);
143
144exit_driver_unregister:
145 platform_driver_unregister(&tile_rtc_platform_driver);
146 return err;
147}
148
149/*
150 * Driver cleanup routine.
151 */
152static void __exit tile_rtc_driver_exit(void)
153{
154 platform_driver_unregister(&tile_rtc_platform_driver);
155}
156
157module_init(tile_rtc_driver_init);
158module_exit(tile_rtc_driver_exit);
159
160MODULE_DESCRIPTION("Tilera-specific Real Time Clock Driver");
161MODULE_LICENSE("GPL");
162MODULE_ALIAS("platform:rtc-tile");