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mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-23 12:43:55 +08:00
linux-next/include/linux/mmtimer.h
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

57 lines
2.0 KiB
C

/*
* Intel Multimedia Timer device interface
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (c) 2001-2004 Silicon Graphics, Inc. All rights reserved.
*
* This file should define an interface compatible with the IA-PC Multimedia
* Timers Draft Specification (rev. 0.97) from Intel. Note that some
* hardware may not be able to safely export its registers to userspace,
* so the ioctl interface should support all necessary functionality.
*
* 11/01/01 - jbarnes - initial revision
* 9/10/04 - Christoph Lameter - remove interrupt support
* 9/17/04 - jbarnes - remove test program, move some #defines to the driver
*/
#ifndef _LINUX_MMTIMER_H
#define _LINUX_MMTIMER_H
/*
* Breakdown of the ioctl's available. An 'optional' next to the command
* indicates that supporting this command is optional, while 'required'
* commands must be implemented if conformance is desired.
*
* MMTIMER_GETOFFSET - optional
* Should return the offset (relative to the start of the page where the
* registers are mapped) for the counter in question.
*
* MMTIMER_GETRES - required
* The resolution of the clock in femto (10^-15) seconds
*
* MMTIMER_GETFREQ - required
* Frequency of the clock in Hz
*
* MMTIMER_GETBITS - required
* Number of bits in the clock's counter
*
* MMTIMER_MMAPAVAIL - required
* Returns nonzero if the registers can be mmap'd into userspace, 0 otherwise
*
* MMTIMER_GETCOUNTER - required
* Gets the current value in the counter
*/
#define MMTIMER_IOCTL_BASE 'm'
#define MMTIMER_GETOFFSET _IO(MMTIMER_IOCTL_BASE, 0)
#define MMTIMER_GETRES _IOR(MMTIMER_IOCTL_BASE, 1, unsigned long)
#define MMTIMER_GETFREQ _IOR(MMTIMER_IOCTL_BASE, 2, unsigned long)
#define MMTIMER_GETBITS _IO(MMTIMER_IOCTL_BASE, 4)
#define MMTIMER_MMAPAVAIL _IO(MMTIMER_IOCTL_BASE, 6)
#define MMTIMER_GETCOUNTER _IOR(MMTIMER_IOCTL_BASE, 9, unsigned long)
#endif /* _LINUX_MMTIMER_H */