/*
   * Intel Multimedia Timer device interface
   *
   * This file is subject to the terms and conditions of the GNU General Public
   * License.  See the file "COPYING" in the main directory of this archive
   * for more details.
   *
   * Copyright (c) 2001-2004 Silicon Graphics, Inc.  All rights reserved.
   *
   * This file should define an interface compatible with the IA-PC Multimedia
   * Timers Draft Specification (rev. 0.97) from Intel.  Note that some
   * hardware may not be able to safely export its registers to userspace,
   * so the ioctl interface should support all necessary functionality.
   *
   * 11/01/01 - jbarnes - initial revision
   * 9/10/04 - Christoph Lameter - remove interrupt support
   * 9/17/04 - jbarnes - remove test program, move some #defines to the driver
   */
  
  #ifndef _LINUX_MMTIMER_H
  #define _LINUX_MMTIMER_H
  
  /*
   * Breakdown of the ioctl's available.  An 'optional' next to the command
   * indicates that supporting this command is optional, while 'required'
   * commands must be implemented if conformance is desired.
   *
   * MMTIMER_GETOFFSET - optional
   *   Should return the offset (relative to the start of the page where the
   *   registers are mapped) for the counter in question.
   *
   * MMTIMER_GETRES - required
   *   The resolution of the clock in femto (10^-15) seconds
   *
   * MMTIMER_GETFREQ - required
   *   Frequency of the clock in Hz
   *
   * MMTIMER_GETBITS - required
   *   Number of bits in the clock's counter
   *
   * MMTIMER_MMAPAVAIL - required
   *   Returns nonzero if the registers can be mmap'd into userspace, 0 otherwise
   *
   * MMTIMER_GETCOUNTER - required
   *   Gets the current value in the counter
   */
  #define MMTIMER_IOCTL_BASE 'm'
  
  #define MMTIMER_GETOFFSET _IO(MMTIMER_IOCTL_BASE, 0)
  #define MMTIMER_GETRES _IOR(MMTIMER_IOCTL_BASE, 1, unsigned long)
  #define MMTIMER_GETFREQ _IOR(MMTIMER_IOCTL_BASE, 2, unsigned long)
  #define MMTIMER_GETBITS _IO(MMTIMER_IOCTL_BASE, 4)
  #define MMTIMER_MMAPAVAIL _IO(MMTIMER_IOCTL_BASE, 6)
  #define MMTIMER_GETCOUNTER _IOR(MMTIMER_IOCTL_BASE, 9, unsigned long)
  
  #endif /* _LINUX_MMTIMER_H */