time.c 2.2 KB

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  1. /*
  2. * (C) Copyright 2000, 2001
  3. * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  4. *
  5. * (C) Copyright 2007
  6. * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
  7. *
  8. * See file CREDITS for list of people who contributed to this
  9. * project.
  10. *
  11. * This program is free software; you can redistribute it and/or
  12. * modify it under the terms of the GNU General Public License as
  13. * published by the Free Software Foundation; either version 2 of
  14. * the License, or (at your option) any later version.
  15. *
  16. * This program is distributed in the hope that it will be useful,
  17. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  19. * GNU General Public License for more details.
  20. *
  21. * You should have received a copy of the GNU General Public License
  22. * along with this program; if not, write to the Free Software
  23. * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24. * MA 02111-1307 USA
  25. */
  26. #include <common.h>
  27. /* Implemented by SPARC CPUs */
  28. extern void cpu_wait_ticks(unsigned long ticks);
  29. extern unsigned long cpu_usec2ticks(unsigned long usec);
  30. extern unsigned long cpu_ticks2usec(unsigned long ticks);
  31. /* ------------------------------------------------------------------------- */
  32. void wait_ticks(unsigned long ticks)
  33. {
  34. cpu_wait_ticks(ticks);
  35. }
  36. /*
  37. * This function is intended for SHORT delays only.
  38. */
  39. unsigned long usec2ticks(unsigned long usec)
  40. {
  41. return cpu_usec2ticks(usec);
  42. }
  43. /* ------------------------------------------------------------------------- */
  44. /*
  45. * We implement the delay by converting the delay (the number of
  46. * microseconds to wait) into a number of time base ticks; then we
  47. * watch the time base until it has incremented by that amount.
  48. */
  49. void __udelay(unsigned long usec)
  50. {
  51. ulong ticks = usec2ticks(usec);
  52. wait_ticks(ticks);
  53. }
  54. /* ------------------------------------------------------------------------- */
  55. unsigned long ticks2usec(unsigned long ticks)
  56. {
  57. return cpu_ticks2usec(ticks);
  58. }
  59. /* ------------------------------------------------------------------------- */
  60. int init_timebase(void)
  61. {
  62. return (0);
  63. }
  64. /* ------------------------------------------------------------------------- */