LXR linux/drivers/rtc/rtc-ps3.c

   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