--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/include/linux/mmtimer.h	Sun Jan 11 20:20:11 2009 +0100
@@ -0,0 +1,56 @@
+/*
+ * 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 */