130692c65c4174412c90e79489e98ab85c1a7412fBen Cheng/* 230692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * Intel Multimedia Timer device interface 330692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * 430692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * This file is subject to the terms and conditions of the GNU General Public 530692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * License. See the file "COPYING" in the main directory of this archive 630692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * for more details. 730692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * 830692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * Copyright (c) 2001-2004 Silicon Graphics, Inc. All rights reserved. 930692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * 1030692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * This file should define an interface compatible with the IA-PC Multimedia 1130692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * Timers Draft Specification (rev. 0.97) from Intel. Note that some 1230692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * hardware may not be able to safely export its registers to userspace, 1330692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * so the ioctl interface should support all necessary functionality. 1430692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * 1530692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * 11/01/01 - jbarnes - initial revision 1630692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * 9/10/04 - Christoph Lameter - remove interrupt support 1730692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * 9/17/04 - jbarnes - remove test program, move some #defines to the driver 1830692c65c4174412c90e79489e98ab85c1a7412fBen Cheng */ 1930692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 2030692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#ifndef _LINUX_MMTIMER_H 2130692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define _LINUX_MMTIMER_H 2230692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 2330692c65c4174412c90e79489e98ab85c1a7412fBen Cheng/* 2430692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * Breakdown of the ioctl's available. An 'optional' next to the command 2530692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * indicates that supporting this command is optional, while 'required' 2630692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * commands must be implemented if conformance is desired. 2730692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * 2830692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * MMTIMER_GETOFFSET - optional 2930692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * Should return the offset (relative to the start of the page where the 3030692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * registers are mapped) for the counter in question. 3130692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * 3230692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * MMTIMER_GETRES - required 3330692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * The resolution of the clock in femto (10^-15) seconds 3430692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * 3530692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * MMTIMER_GETFREQ - required 3630692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * Frequency of the clock in Hz 3730692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * 3830692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * MMTIMER_GETBITS - required 3930692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * Number of bits in the clock's counter 4030692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * 4130692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * MMTIMER_MMAPAVAIL - required 4230692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * Returns nonzero if the registers can be mmap'd into userspace, 0 otherwise 4330692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * 4430692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * MMTIMER_GETCOUNTER - required 4530692c65c4174412c90e79489e98ab85c1a7412fBen Cheng * Gets the current value in the counter 4630692c65c4174412c90e79489e98ab85c1a7412fBen Cheng */ 4730692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define MMTIMER_IOCTL_BASE 'm' 4830692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 4930692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define MMTIMER_GETOFFSET _IO(MMTIMER_IOCTL_BASE, 0) 5030692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define MMTIMER_GETRES _IOR(MMTIMER_IOCTL_BASE, 1, unsigned long) 5130692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define MMTIMER_GETFREQ _IOR(MMTIMER_IOCTL_BASE, 2, unsigned long) 5230692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define MMTIMER_GETBITS _IO(MMTIMER_IOCTL_BASE, 4) 5330692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define MMTIMER_MMAPAVAIL _IO(MMTIMER_IOCTL_BASE, 6) 5430692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#define MMTIMER_GETCOUNTER _IOR(MMTIMER_IOCTL_BASE, 9, unsigned long) 5530692c65c4174412c90e79489e98ab85c1a7412fBen Cheng 5630692c65c4174412c90e79489e98ab85c1a7412fBen Cheng#endif /* _LINUX_MMTIMER_H */ 57