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"); 74