1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * PS3 RTC Driver
4 *
5 * Copyright 2009 Sony Corporation
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/rtc.h>
12
13 #include <asm/lv1call.h>
14 #include <asm/ps3.h>
15
16
read_rtc(void)17 static u64 read_rtc(void)
18 {
19 int result;
20 u64 rtc_val;
21 u64 tb_val;
22
23 result = lv1_get_rtc(&rtc_val, &tb_val);
24 BUG_ON(result);
25
26 return rtc_val;
27 }
28
ps3_get_time(struct device * dev,struct rtc_time * tm)29 static int ps3_get_time(struct device *dev, struct rtc_time *tm)
30 {
31 rtc_time64_to_tm(read_rtc() + ps3_os_area_get_rtc_diff(), tm);
32 return 0;
33 }
34
ps3_set_time(struct device * dev,struct rtc_time * tm)35 static int ps3_set_time(struct device *dev, struct rtc_time *tm)
36 {
37 ps3_os_area_set_rtc_diff(rtc_tm_to_time64(tm) - read_rtc());
38 return 0;
39 }
40
41 static const struct rtc_class_ops ps3_rtc_ops = {
42 .read_time = ps3_get_time,
43 .set_time = ps3_set_time,
44 };
45
ps3_rtc_probe(struct platform_device * dev)46 static int __init ps3_rtc_probe(struct platform_device *dev)
47 {
48 struct rtc_device *rtc;
49
50 rtc = devm_rtc_allocate_device(&dev->dev);
51 if (IS_ERR(rtc))
52 return PTR_ERR(rtc);
53
54 rtc->ops = &ps3_rtc_ops;
55 rtc->range_max = U64_MAX;
56
57 platform_set_drvdata(dev, rtc);
58
59 return devm_rtc_register_device(rtc);
60 }
61
62 static struct platform_driver ps3_rtc_driver = {
63 .driver = {
64 .name = "rtc-ps3",
65 },
66 };
67
68 module_platform_driver_probe(ps3_rtc_driver, ps3_rtc_probe);
69
70 MODULE_AUTHOR("Sony Corporation");
71 MODULE_LICENSE("GPL");
72 MODULE_DESCRIPTION("ps3 RTC driver");
73 MODULE_ALIAS("platform:rtc-ps3");
74
