/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* 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 */
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