xref: /openbmc/linux/drivers/rtc/rtc-ps3.c (revision 2c684d89)
1 /*
2  * PS3 RTC Driver
3  *
4  * Copyright 2009 Sony Corporation
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; version 2 of the License.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program.
17  * If not, see <http://www.gnu.org/licenses/>.
18  */
19 
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/platform_device.h>
23 #include <linux/rtc.h>
24 
25 #include <asm/lv1call.h>
26 #include <asm/ps3.h>
27 
28 
29 static u64 read_rtc(void)
30 {
31 	int result;
32 	u64 rtc_val;
33 	u64 tb_val;
34 
35 	result = lv1_get_rtc(&rtc_val, &tb_val);
36 	BUG_ON(result);
37 
38 	return rtc_val;
39 }
40 
41 static int ps3_get_time(struct device *dev, struct rtc_time *tm)
42 {
43 	rtc_time_to_tm(read_rtc() + ps3_os_area_get_rtc_diff(), tm);
44 	return rtc_valid_tm(tm);
45 }
46 
47 static int ps3_set_time(struct device *dev, struct rtc_time *tm)
48 {
49 	unsigned long now;
50 
51 	rtc_tm_to_time(tm, &now);
52 	ps3_os_area_set_rtc_diff(now - read_rtc());
53 	return 0;
54 }
55 
56 static const struct rtc_class_ops ps3_rtc_ops = {
57 	.read_time = ps3_get_time,
58 	.set_time = ps3_set_time,
59 };
60 
61 static int __init ps3_rtc_probe(struct platform_device *dev)
62 {
63 	struct rtc_device *rtc;
64 
65 	rtc = devm_rtc_device_register(&dev->dev, "rtc-ps3", &ps3_rtc_ops,
66 				  THIS_MODULE);
67 	if (IS_ERR(rtc))
68 		return PTR_ERR(rtc);
69 
70 	platform_set_drvdata(dev, rtc);
71 	return 0;
72 }
73 
74 static struct platform_driver ps3_rtc_driver = {
75 	.driver = {
76 		.name = "rtc-ps3",
77 	},
78 };
79 
80 module_platform_driver_probe(ps3_rtc_driver, ps3_rtc_probe);
81 
82 MODULE_AUTHOR("Sony Corporation");
83 MODULE_LICENSE("GPL");
84 MODULE_DESCRIPTION("ps3 RTC driver");
85 MODULE_ALIAS("platform:rtc-ps3");
86