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58 lines
2.1 KiB
C
58 lines
2.1 KiB
C
4 years ago
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* Intel Multimedia Timer device interface
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (c) 2001-2004 Silicon Graphics, Inc. All rights reserved.
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*
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* This file should define an interface compatible with the IA-PC Multimedia
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* Timers Draft Specification (rev. 0.97) from Intel. Note that some
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* hardware may not be able to safely export its registers to userspace,
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* so the ioctl interface should support all necessary functionality.
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*
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* 11/01/01 - jbarnes - initial revision
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* 9/10/04 - Christoph Lameter - remove interrupt support
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* 9/17/04 - jbarnes - remove test program, move some #defines to the driver
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*/
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#ifndef _LINUX_MMTIMER_H
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#define _LINUX_MMTIMER_H
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/*
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* Breakdown of the ioctl's available. An 'optional' next to the command
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* indicates that supporting this command is optional, while 'required'
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* commands must be implemented if conformance is desired.
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*
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* MMTIMER_GETOFFSET - optional
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* Should return the offset (relative to the start of the page where the
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* registers are mapped) for the counter in question.
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*
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* MMTIMER_GETRES - required
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* The resolution of the clock in femto (10^-15) seconds
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*
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* MMTIMER_GETFREQ - required
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* Frequency of the clock in Hz
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*
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* MMTIMER_GETBITS - required
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* Number of bits in the clock's counter
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*
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* MMTIMER_MMAPAVAIL - required
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* Returns nonzero if the registers can be mmap'd into userspace, 0 otherwise
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*
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* MMTIMER_GETCOUNTER - required
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* Gets the current value in the counter
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*/
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#define MMTIMER_IOCTL_BASE 'm'
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#define MMTIMER_GETOFFSET _IO(MMTIMER_IOCTL_BASE, 0)
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#define MMTIMER_GETRES _IOR(MMTIMER_IOCTL_BASE, 1, unsigned long)
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#define MMTIMER_GETFREQ _IOR(MMTIMER_IOCTL_BASE, 2, unsigned long)
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#define MMTIMER_GETBITS _IO(MMTIMER_IOCTL_BASE, 4)
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#define MMTIMER_MMAPAVAIL _IO(MMTIMER_IOCTL_BASE, 6)
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#define MMTIMER_GETCOUNTER _IOR(MMTIMER_IOCTL_BASE, 9, unsigned long)
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#endif /* _LINUX_MMTIMER_H */
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