| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |