LXR linux/arch/xtensa/include/asm/timex.h

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (C) 2001 - 2013 Tensilica Inc.
   7 */
   8
   9#ifndef _XTENSA_TIMEX_H
  10#define _XTENSA_TIMEX_H
  11
  12#include <asm/processor.h>
  13
  14#if XCHAL_NUM_TIMERS > 0 && \
  15        XTENSA_INT_LEVEL(XCHAL_TIMER0_INTERRUPT) <= XCHAL_EXCM_LEVEL
  16# define LINUX_TIMER     0
  17# define LINUX_TIMER_INT XCHAL_TIMER0_INTERRUPT
  18#elif XCHAL_NUM_TIMERS > 1 && \
  19        XTENSA_INT_LEVEL(XCHAL_TIMER1_INTERRUPT) <= XCHAL_EXCM_LEVEL
  20# define LINUX_TIMER     1
  21# define LINUX_TIMER_INT XCHAL_TIMER1_INTERRUPT
  22#elif XCHAL_NUM_TIMERS > 2 && \
  23        XTENSA_INT_LEVEL(XCHAL_TIMER2_INTERRUPT) <= XCHAL_EXCM_LEVEL
  24# define LINUX_TIMER     2
  25# define LINUX_TIMER_INT XCHAL_TIMER2_INTERRUPT
  26#else
  27# error "Bad timer number for Linux configurations!"
  28#endif
  29
  30extern unsigned long ccount_freq;
  31
  32typedef unsigned long long cycles_t;
  33
  34#define get_cycles()    (0)
  35
  36void local_timer_setup(unsigned cpu);
  37
  38/*
  39 * Register access.
  40 */
  41
  42static inline unsigned long get_ccount (void)
  43{
  44        return xtensa_get_sr(ccount);
  45}
  46
  47static inline void set_ccount (unsigned long ccount)
  48{
  49        xtensa_set_sr(ccount, ccount);
  50}
  51
  52static inline unsigned long get_linux_timer (void)
  53{
  54        return xtensa_get_sr(SREG_CCOMPARE + LINUX_TIMER);
  55}
  56
  57static inline void set_linux_timer (unsigned long ccompare)
  58{
  59        xtensa_set_sr(ccompare, SREG_CCOMPARE + LINUX_TIMER);
  60}
  61
  62#endif  /* _XTENSA_TIMEX_H */
  63