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dd196a2b CM |
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. */ | |
23 | static struct platform_device *tile_rtc_platform_device; | |
24 | ||
25 | /* | |
26 | * RTC read routine. Gets time info from RTC chip via hypervisor syscall. | |
27 | */ | |
28 | static 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 | */ | |
52 | static 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 | */ | |
71 | static 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 | */ | |
5a167f45 | 79 | static int tile_rtc_probe(struct platform_device *dev) |
dd196a2b CM |
80 | { |
81 | struct rtc_device *rtc; | |
82 | ||
3a30b26e JH |
83 | rtc = devm_rtc_device_register(&dev->dev, "tile", |
84 | &tile_rtc_ops, THIS_MODULE); | |
dd196a2b CM |
85 | |
86 | if (IS_ERR(rtc)) | |
87 | return PTR_ERR(rtc); | |
88 | ||
89 | platform_set_drvdata(dev, rtc); | |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
dd196a2b CM |
94 | static struct platform_driver tile_rtc_platform_driver = { |
95 | .driver = { | |
96 | .name = "rtc-tile", | |
dd196a2b CM |
97 | }, |
98 | .probe = tile_rtc_probe, | |
dd196a2b CM |
99 | }; |
100 | ||
101 | /* | |
102 | * Driver init routine. | |
103 | */ | |
104 | static int __init tile_rtc_driver_init(void) | |
105 | { | |
106 | int err; | |
107 | ||
108 | err = platform_driver_register(&tile_rtc_platform_driver); | |
109 | if (err) | |
110 | return err; | |
111 | ||
112 | tile_rtc_platform_device = platform_device_alloc("rtc-tile", 0); | |
113 | if (tile_rtc_platform_device == NULL) { | |
114 | err = -ENOMEM; | |
115 | goto exit_driver_unregister; | |
116 | } | |
117 | ||
118 | err = platform_device_add(tile_rtc_platform_device); | |
119 | if (err) | |
120 | goto exit_device_put; | |
121 | ||
122 | return 0; | |
123 | ||
124 | exit_device_put: | |
125 | platform_device_put(tile_rtc_platform_device); | |
126 | ||
127 | exit_driver_unregister: | |
128 | platform_driver_unregister(&tile_rtc_platform_driver); | |
129 | return err; | |
130 | } | |
131 | ||
132 | /* | |
133 | * Driver cleanup routine. | |
134 | */ | |
135 | static void __exit tile_rtc_driver_exit(void) | |
136 | { | |
52fbc779 | 137 | platform_device_unregister(tile_rtc_platform_device); |
dd196a2b CM |
138 | platform_driver_unregister(&tile_rtc_platform_driver); |
139 | } | |
140 | ||
141 | module_init(tile_rtc_driver_init); | |
142 | module_exit(tile_rtc_driver_exit); | |
143 | ||
144 | MODULE_DESCRIPTION("Tilera-specific Real Time Clock Driver"); | |
145 | MODULE_LICENSE("GPL"); | |
146 | MODULE_ALIAS("platform:rtc-tile"); |