1 /* 2 * Copyright 2006, Ingo Weinhold <bonefish@cs.tu-berlin.de>. 3 * Copyright 2010, Andreas Färber <andreas.faerber@web.de> 4 * All rights reserved. Distributed under the terms of the MIT License. 5 */ 6 7 8 #include "real_time_clock.h" 9 10 #include <stdio.h> 11 12 #include <boot/kernel_args.h> 13 #include <boot/stage2.h> 14 #include <platform/openfirmware/devices.h> 15 #include <platform/openfirmware/openfirmware.h> 16 17 18 static int sHandle = OF_FAILED; 19 20 21 status_t 22 init_real_time_clock(void) 23 { 24 // find RTC 25 int rtcCookie = 0; 26 if (of_get_next_device(&rtcCookie, 0, "rtc", 27 gKernelArgs.platform_args.rtc_path, 28 sizeof(gKernelArgs.platform_args.rtc_path)) != B_OK) { 29 printf("init_real_time_clock(): Found no RTC device!"); 30 return B_ERROR; 31 } 32 33 sHandle = of_open(gKernelArgs.platform_args.rtc_path); 34 if (sHandle == OF_FAILED) { 35 printf("%s(): Could not open RTC device!\n", __func__); 36 return B_ERROR; 37 } 38 39 return B_OK; 40 } 41 42 43 bigtime_t 44 real_time_clock_usecs(void) 45 { 46 if (sHandle == OF_FAILED) 47 return OF_FAILED; 48 int second, minute, hour, day, month, year; 49 if (of_call_method(sHandle, "get-time", 0, 6, &year, &month, &day, 50 &hour, &minute, &second) == OF_FAILED) 51 return OF_FAILED; 52 int days = day; 53 // TODO: Apply algorithm from kernel 54 // to assure monotonically increasing date. 55 return (((days * 24 + hour) * 60ULL + minute) * 60ULL + second) 56 * 1000000ULL; 57 } 58