1*e2be04c7SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2607ca46eSDavid Howells /* 3607ca46eSDavid Howells * Intel Multimedia Timer device interface 4607ca46eSDavid Howells * 5607ca46eSDavid Howells * This file is subject to the terms and conditions of the GNU General Public 6607ca46eSDavid Howells * License. See the file "COPYING" in the main directory of this archive 7607ca46eSDavid Howells * for more details. 8607ca46eSDavid Howells * 9607ca46eSDavid Howells * Copyright (c) 2001-2004 Silicon Graphics, Inc. All rights reserved. 10607ca46eSDavid Howells * 11607ca46eSDavid Howells * This file should define an interface compatible with the IA-PC Multimedia 12607ca46eSDavid Howells * Timers Draft Specification (rev. 0.97) from Intel. Note that some 13607ca46eSDavid Howells * hardware may not be able to safely export its registers to userspace, 14607ca46eSDavid Howells * so the ioctl interface should support all necessary functionality. 15607ca46eSDavid Howells * 16607ca46eSDavid Howells * 11/01/01 - jbarnes - initial revision 17607ca46eSDavid Howells * 9/10/04 - Christoph Lameter - remove interrupt support 18607ca46eSDavid Howells * 9/17/04 - jbarnes - remove test program, move some #defines to the driver 19607ca46eSDavid Howells */ 20607ca46eSDavid Howells 21607ca46eSDavid Howells #ifndef _LINUX_MMTIMER_H 22607ca46eSDavid Howells #define _LINUX_MMTIMER_H 23607ca46eSDavid Howells 24607ca46eSDavid Howells /* 25607ca46eSDavid Howells * Breakdown of the ioctl's available. An 'optional' next to the command 26607ca46eSDavid Howells * indicates that supporting this command is optional, while 'required' 27607ca46eSDavid Howells * commands must be implemented if conformance is desired. 28607ca46eSDavid Howells * 29607ca46eSDavid Howells * MMTIMER_GETOFFSET - optional 30607ca46eSDavid Howells * Should return the offset (relative to the start of the page where the 31607ca46eSDavid Howells * registers are mapped) for the counter in question. 32607ca46eSDavid Howells * 33607ca46eSDavid Howells * MMTIMER_GETRES - required 34607ca46eSDavid Howells * The resolution of the clock in femto (10^-15) seconds 35607ca46eSDavid Howells * 36607ca46eSDavid Howells * MMTIMER_GETFREQ - required 37607ca46eSDavid Howells * Frequency of the clock in Hz 38607ca46eSDavid Howells * 39607ca46eSDavid Howells * MMTIMER_GETBITS - required 40607ca46eSDavid Howells * Number of bits in the clock's counter 41607ca46eSDavid Howells * 42607ca46eSDavid Howells * MMTIMER_MMAPAVAIL - required 43607ca46eSDavid Howells * Returns nonzero if the registers can be mmap'd into userspace, 0 otherwise 44607ca46eSDavid Howells * 45607ca46eSDavid Howells * MMTIMER_GETCOUNTER - required 46607ca46eSDavid Howells * Gets the current value in the counter 47607ca46eSDavid Howells */ 48607ca46eSDavid Howells #define MMTIMER_IOCTL_BASE 'm' 49607ca46eSDavid Howells 50607ca46eSDavid Howells #define MMTIMER_GETOFFSET _IO(MMTIMER_IOCTL_BASE, 0) 51607ca46eSDavid Howells #define MMTIMER_GETRES _IOR(MMTIMER_IOCTL_BASE, 1, unsigned long) 52607ca46eSDavid Howells #define MMTIMER_GETFREQ _IOR(MMTIMER_IOCTL_BASE, 2, unsigned long) 53607ca46eSDavid Howells #define MMTIMER_GETBITS _IO(MMTIMER_IOCTL_BASE, 4) 54607ca46eSDavid Howells #define MMTIMER_MMAPAVAIL _IO(MMTIMER_IOCTL_BASE, 6) 55607ca46eSDavid Howells #define MMTIMER_GETCOUNTER _IOR(MMTIMER_IOCTL_BASE, 9, unsigned long) 56607ca46eSDavid Howells 57607ca46eSDavid Howells #endif /* _LINUX_MMTIMER_H */ 58