Furquan Shaikh | 4208e0c | 2014-04-28 16:43:07 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright 2014 Google Inc. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
Furquan Shaikh | 4208e0c | 2014-04-28 16:43:07 -0700 | [diff] [blame] | 14 | */ |
| 15 | |
Furquan Shaikh | 4208e0c | 2014-04-28 16:43:07 -0700 | [diff] [blame] | 16 | #include <timer.h> |
| 17 | #include <delay.h> |
| 18 | #include <thread.h> |
| 19 | |
Aaron Durbin | 6403167 | 2018-04-21 14:45:32 -0600 | [diff] [blame] | 20 | __weak void init_timer(void) { /* do nothing */ } |
Julius Werner | 44cf870 | 2014-12-08 13:39:14 -0800 | [diff] [blame] | 21 | |
Lee Leahy | 75b8599 | 2017-03-08 16:34:12 -0800 | [diff] [blame] | 22 | void udelay(unsigned int usec) |
Furquan Shaikh | 4208e0c | 2014-04-28 16:43:07 -0700 | [diff] [blame] | 23 | { |
Aaron Durbin | b9894ef | 2014-09-23 16:33:21 -0500 | [diff] [blame] | 24 | struct stopwatch sw; |
Aaron Durbin | 515bd13 | 2014-08-04 16:21:50 -0500 | [diff] [blame] | 25 | |
| 26 | /* |
Aaron Durbin | e5e3630 | 2014-09-25 10:05:15 -0500 | [diff] [blame] | 27 | * As the timer granularity is in microseconds pad the |
Aaron Durbin | 515bd13 | 2014-08-04 16:21:50 -0500 | [diff] [blame] | 28 | * requested delay by one to get at least >= requested usec delay. |
| 29 | */ |
Aaron Durbin | b9894ef | 2014-09-23 16:33:21 -0500 | [diff] [blame] | 30 | usec += 1; |
| 31 | |
| 32 | if (!thread_yield_microseconds(usec)) |
| 33 | return; |
| 34 | |
| 35 | stopwatch_init_usecs_expire(&sw, usec); |
Jonathan Neuschäfer | c966075 | 2017-09-19 15:19:54 +0200 | [diff] [blame] | 36 | stopwatch_wait_until_expired(&sw); |
Furquan Shaikh | 4208e0c | 2014-04-28 16:43:07 -0700 | [diff] [blame] | 37 | } |