/* 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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