/*

 * 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 */