| 1 | /* $NetBSD: delay.h,v 1.4 2016/02/19 21:08:19 skrll 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 | usleep_range(unsigned long minimum, unsigned long maximum __unused) |
| 51 | { |
| 52 | DELAY(minimum); |
| 53 | } |
| 54 | |
| 55 | static inline void |
| 56 | mdelay(unsigned int msec) |
| 57 | { |
| 58 | |
| 59 | if (msec < MAX_UDELAY_MS) |
| 60 | udelay(msec * 1000); |
| 61 | else |
| 62 | while (msec--) |
| 63 | udelay(1000); |
| 64 | } |
| 65 | |
| 66 | static inline void |
| 67 | msleep(unsigned int msec) |
| 68 | { |
| 69 | if (cold || |
| 70 | ((hz < 1000) && (msec < (1000/hz)))) |
| 71 | mdelay(msec); |
| 72 | else |
| 73 | (void)kpause("lnxmslep" , false, mstohz(msec), NULL); |
| 74 | } |
| 75 | |
| 76 | static inline void |
| 77 | ndelay(unsigned int nsec) |
| 78 | { |
| 79 | |
| 80 | DELAY(nsec / 1000); |
| 81 | } |
| 82 | |
| 83 | #endif /* _LINUX_DELAY_H_ */ |
| 84 | |