1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * PS3 RTC Driver
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright 2009 Sony Corporation
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/kernel.h>
9*4882a593Smuzhiyun #include <linux/module.h>
10*4882a593Smuzhiyun #include <linux/platform_device.h>
11*4882a593Smuzhiyun #include <linux/rtc.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include <asm/lv1call.h>
14*4882a593Smuzhiyun #include <asm/ps3.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun
read_rtc(void)17*4882a593Smuzhiyun static u64 read_rtc(void)
18*4882a593Smuzhiyun {
19*4882a593Smuzhiyun int result;
20*4882a593Smuzhiyun u64 rtc_val;
21*4882a593Smuzhiyun u64 tb_val;
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun result = lv1_get_rtc(&rtc_val, &tb_val);
24*4882a593Smuzhiyun BUG_ON(result);
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun return rtc_val;
27*4882a593Smuzhiyun }
28*4882a593Smuzhiyun
ps3_get_time(struct device * dev,struct rtc_time * tm)29*4882a593Smuzhiyun static int ps3_get_time(struct device *dev, struct rtc_time *tm)
30*4882a593Smuzhiyun {
31*4882a593Smuzhiyun rtc_time64_to_tm(read_rtc() + ps3_os_area_get_rtc_diff(), tm);
32*4882a593Smuzhiyun return 0;
33*4882a593Smuzhiyun }
34*4882a593Smuzhiyun
ps3_set_time(struct device * dev,struct rtc_time * tm)35*4882a593Smuzhiyun static int ps3_set_time(struct device *dev, struct rtc_time *tm)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun ps3_os_area_set_rtc_diff(rtc_tm_to_time64(tm) - read_rtc());
38*4882a593Smuzhiyun return 0;
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun static const struct rtc_class_ops ps3_rtc_ops = {
42*4882a593Smuzhiyun .read_time = ps3_get_time,
43*4882a593Smuzhiyun .set_time = ps3_set_time,
44*4882a593Smuzhiyun };
45*4882a593Smuzhiyun
ps3_rtc_probe(struct platform_device * dev)46*4882a593Smuzhiyun static int __init ps3_rtc_probe(struct platform_device *dev)
47*4882a593Smuzhiyun {
48*4882a593Smuzhiyun struct rtc_device *rtc;
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun rtc = devm_rtc_allocate_device(&dev->dev);
51*4882a593Smuzhiyun if (IS_ERR(rtc))
52*4882a593Smuzhiyun return PTR_ERR(rtc);
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun rtc->ops = &ps3_rtc_ops;
55*4882a593Smuzhiyun rtc->range_max = U64_MAX;
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun platform_set_drvdata(dev, rtc);
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun return rtc_register_device(rtc);
60*4882a593Smuzhiyun }
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun static struct platform_driver ps3_rtc_driver = {
63*4882a593Smuzhiyun .driver = {
64*4882a593Smuzhiyun .name = "rtc-ps3",
65*4882a593Smuzhiyun },
66*4882a593Smuzhiyun };
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun module_platform_driver_probe(ps3_rtc_driver, ps3_rtc_probe);
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun MODULE_AUTHOR("Sony Corporation");
71*4882a593Smuzhiyun MODULE_LICENSE("GPL");
72*4882a593Smuzhiyun MODULE_DESCRIPTION("ps3 RTC driver");
73*4882a593Smuzhiyun MODULE_ALIAS("platform:rtc-ps3");
74