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