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
  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
  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
  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
  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");