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
17static 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
29static 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
35static 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
41static const struct rtc_class_ops ps3_rtc_ops = {
42	.read_time = ps3_get_time,
43	.set_time = ps3_set_time,
44};
45
46static 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
62static struct platform_driver ps3_rtc_driver = {
63	.driver = {
64		.name = "rtc-ps3",
65	},
66};
67
68module_platform_driver_probe(ps3_rtc_driver, ps3_rtc_probe);
69
70MODULE_AUTHOR("Sony Corporation");
71MODULE_LICENSE("GPL");
72MODULE_DESCRIPTION("ps3 RTC driver");
73MODULE_ALIAS("platform:rtc-ps3");
74