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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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72dd89c0bc
The PS3 has a 64bit second counter from 2000. While this exceeds the 64bit UNIX timestamp, there is not doubt that non of them will still be working by then. Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
74 lines
1.4 KiB
C
74 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* PS3 RTC Driver
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*
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* Copyright 2009 Sony Corporation
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/rtc.h>
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#include <asm/lv1call.h>
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#include <asm/ps3.h>
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static u64 read_rtc(void)
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{
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int result;
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u64 rtc_val;
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u64 tb_val;
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result = lv1_get_rtc(&rtc_val, &tb_val);
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BUG_ON(result);
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return rtc_val;
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}
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static int ps3_get_time(struct device *dev, struct rtc_time *tm)
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{
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rtc_time64_to_tm(read_rtc() + ps3_os_area_get_rtc_diff(), tm);
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return 0;
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}
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static int ps3_set_time(struct device *dev, struct rtc_time *tm)
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{
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ps3_os_area_set_rtc_diff(rtc_tm_to_time64(tm) - read_rtc());
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return 0;
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}
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static const struct rtc_class_ops ps3_rtc_ops = {
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.read_time = ps3_get_time,
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.set_time = ps3_set_time,
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};
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static int __init ps3_rtc_probe(struct platform_device *dev)
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{
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struct rtc_device *rtc;
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rtc = devm_rtc_allocate_device(&dev->dev);
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if (IS_ERR(rtc))
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return PTR_ERR(rtc);
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rtc->ops = &ps3_rtc_ops;
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rtc->range_max = U64_MAX;
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platform_set_drvdata(dev, rtc);
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return rtc_register_device(rtc);
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}
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static struct platform_driver ps3_rtc_driver = {
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.driver = {
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.name = "rtc-ps3",
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},
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};
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module_platform_driver_probe(ps3_rtc_driver, ps3_rtc_probe);
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MODULE_AUTHOR("Sony Corporation");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("ps3 RTC driver");
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MODULE_ALIAS("platform:rtc-ps3");
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