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mmtimer.h

mmtimer.h 2.0 KB
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  1. /*
    2. 

  2.  * Intel Multimedia Timer device interface
    3. 

  3.  *
    4. 

  4.  * This file is subject to the terms and conditions of the GNU General Public
    5. 

  5.  * License.  See the file "COPYING" in the main directory of this archive
    6. 

  6.  * for more details.
    7. 

  7.  *
    8. 

  8.  * Copyright (c) 2001-2004 Silicon Graphics, Inc.  All rights reserved.
    9. 

  9.  *
    10. 

  10.  * This file should define an interface compatible with the IA-PC Multimedia
    11. 

  11.  * Timers Draft Specification (rev. 0.97) from Intel.  Note that some
    12. 

  12.  * hardware may not be able to safely export its registers to userspace,
    13. 

  13.  * so the ioctl interface should support all necessary functionality.
    14. 

  14.  *
    15. 

  15.  * 11/01/01 - jbarnes - initial revision
    16. 

  16.  * 9/10/04 - Christoph Lameter - remove interrupt support
    17. 

  17.  * 9/17/04 - jbarnes - remove test program, move some #defines to the driver
    18. 

  18.  */
    19. 

  19. 

  20. #ifndef _LINUX_MMTIMER_H
    21. 

  21. #define _LINUX_MMTIMER_H
    22. 

  22. 

  23. /*
    24. 

  24.  * Breakdown of the ioctl's available.  An 'optional' next to the command
    25. 

  25.  * indicates that supporting this command is optional, while 'required'
    26. 

  26.  * commands must be implemented if conformance is desired.
    27. 

  27.  *
    28. 

  28.  * MMTIMER_GETOFFSET - optional
    29. 

  29.  *   Should return the offset (relative to the start of the page where the
    30. 

  30.  *   registers are mapped) for the counter in question.
    31. 

  31.  *
    32. 

  32.  * MMTIMER_GETRES - required
    33. 

  33.  *   The resolution of the clock in femto (10^-15) seconds
    34. 

  34.  *
    35. 

  35.  * MMTIMER_GETFREQ - required
    36. 

  36.  *   Frequency of the clock in Hz
    37. 

  37.  *
    38. 

  38.  * MMTIMER_GETBITS - required
    39. 

  39.  *   Number of bits in the clock's counter
    40. 

  40.  *
    41. 

  41.  * MMTIMER_MMAPAVAIL - required
    42. 

  42.  *   Returns nonzero if the registers can be mmap'd into userspace, 0 otherwise
    43. 

  43.  *
    44. 

  44.  * MMTIMER_GETCOUNTER - required
    45. 

  45.  *   Gets the current value in the counter
    46. 

  46.  */
    47. 

  47. #define MMTIMER_IOCTL_BASE 'm'
    48. 

  48. 

  49. #define MMTIMER_GETOFFSET _IO(MMTIMER_IOCTL_BASE, 0)
    50. 

  50. #define MMTIMER_GETRES _IOR(MMTIMER_IOCTL_BASE, 1, unsigned long)
    51. 

  51. #define MMTIMER_GETFREQ _IOR(MMTIMER_IOCTL_BASE, 2, unsigned long)
    52. 

  52. #define MMTIMER_GETBITS _IO(MMTIMER_IOCTL_BASE, 4)
    53. 

  53. #define MMTIMER_MMAPAVAIL _IO(MMTIMER_IOCTL_BASE, 6)
    54. 

  54. #define MMTIMER_GETCOUNTER _IOR(MMTIMER_IOCTL_BASE, 9, unsigned long)
    55. 

  55. 

  56. #endif /* _LINUX_MMTIMER_H */
    57.