1 /* 2 * Intel Multimedia Timer device interface 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (c) 2001-2004 Silicon Graphics, Inc. All rights reserved. 9 * 10 * This file should define an interface compatible with the IA-PC Multimedia 11 * Timers Draft Specification (rev. 0.97) from Intel. Note that some 12 * hardware may not be able to safely export its registers to userspace, 13 * so the ioctl interface should support all necessary functionality. 14 * 15 * 11/01/01 - jbarnes - initial revision 16 * 9/10/04 - Christoph Lameter - remove interrupt support 17 * 9/17/04 - jbarnes - remove test program, move some #defines to the driver 18 */ 19 20 #ifndef _LINUX_MMTIMER_H 21 #define _LINUX_MMTIMER_H 22 23 /* 24 * Breakdown of the ioctl's available. An 'optional' next to the command 25 * indicates that supporting this command is optional, while 'required' 26 * commands must be implemented if conformance is desired. 27 * 28 * MMTIMER_GETOFFSET - optional 29 * Should return the offset (relative to the start of the page where the 30 * registers are mapped) for the counter in question. 31 * 32 * MMTIMER_GETRES - required 33 * The resolution of the clock in femto (10^-15) seconds 34 * 35 * MMTIMER_GETFREQ - required 36 * Frequency of the clock in Hz 37 * 38 * MMTIMER_GETBITS - required 39 * Number of bits in the clock's counter 40 * 41 * MMTIMER_MMAPAVAIL - required 42 * Returns nonzero if the registers can be mmap'd into userspace, 0 otherwise 43 * 44 * MMTIMER_GETCOUNTER - required 45 * Gets the current value in the counter 46 */ 47 #define MMTIMER_IOCTL_BASE 'm' 48 49 #define MMTIMER_GETOFFSET _IO(MMTIMER_IOCTL_BASE, 0) 50 #define MMTIMER_GETRES _IOR(MMTIMER_IOCTL_BASE, 1, unsigned long) 51 #define MMTIMER_GETFREQ _IOR(MMTIMER_IOCTL_BASE, 2, unsigned long) 52 #define MMTIMER_GETBITS _IO(MMTIMER_IOCTL_BASE, 4) 53 #define MMTIMER_MMAPAVAIL _IO(MMTIMER_IOCTL_BASE, 6) 54 #define MMTIMER_GETCOUNTER _IOR(MMTIMER_IOCTL_BASE, 9, unsigned long) 55 56 #endif /* _LINUX_MMTIMER_H */ 57
