1 /* $NetBSD: delay.h,v 1.2 2014/03/18 18:20:43 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Taylor R. Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _LINUX_DELAY_H_ 33 #define _LINUX_DELAY_H_ 34 35 #include <sys/param.h> 36 #include <sys/kernel.h> 37 #include <sys/proc.h> 38 39 #include <machine/param.h> 40 41 #define MAX_UDELAY_MS 5 42 43 static inline void 44 udelay(unsigned int usec) 45 { 46 DELAY(usec); 47 } 48 49 static inline void 50 mdelay(unsigned int msec) 51 { 52 53 if (msec < MAX_UDELAY_MS) 54 udelay(msec * 1000); 55 else 56 while (msec--) 57 udelay(1000); 58 } 59 60 static inline void 61 msleep(unsigned int msec) 62 { 63 if ((hz < 1000) && (msec < (1000/hz))) 64 mdelay(msec); 65 else 66 (void)kpause("lnxmslep", false, mstohz(msec), NULL); 67 } 68 69 #endif /* _LINUX_DELAY_H_ */ 70