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#include <linux/stringify.h>
  14
  15#if XCHAL_NUM_TIMERS > 0 && \
  16        XTENSA_INT_LEVEL(XCHAL_TIMER0_INTERRUPT) <= XCHAL_EXCM_LEVEL
  17# define LINUX_TIMER     0
  18# define LINUX_TIMER_INT XCHAL_TIMER0_INTERRUPT
  19#elif XCHAL_NUM_TIMERS > 1 && \
  20        XTENSA_INT_LEVEL(XCHAL_TIMER1_INTERRUPT) <= XCHAL_EXCM_LEVEL
  21# define LINUX_TIMER     1
  22# define LINUX_TIMER_INT XCHAL_TIMER1_INTERRUPT
  23#elif XCHAL_NUM_TIMERS > 2 && \
  24        XTENSA_INT_LEVEL(XCHAL_TIMER2_INTERRUPT) <= XCHAL_EXCM_LEVEL
  25# define LINUX_TIMER     2
  26# define LINUX_TIMER_INT XCHAL_TIMER2_INTERRUPT
  27#else
  28# error "Bad timer number for Linux configurations!"
  29#endif
  30
  31extern unsigned long ccount_freq;
  32
  33typedef unsigned long long cycles_t;
  34
  35#define get_cycles()    (0)
  36
  37void local_timer_setup(unsigned cpu);
  38
  39/*
  40 * Register access.
  41 */
  42
  43#define WSR_CCOUNT(r)     asm volatile ("wsr %0, ccount" :: "a" (r))
  44#define RSR_CCOUNT(r)     asm volatile ("rsr %0, ccount" : "=a" (r))
  45#define WSR_CCOMPARE(x,r) asm volatile ("wsr %0,"__stringify(SREG_CCOMPARE)"+"__stringify(x) :: "a"(r))
  46#define RSR_CCOMPARE(x,r) asm volatile ("rsr %0,"__stringify(SREG_CCOMPARE)"+"__stringify(x) : "=a"(r))
  47
  48static inline unsigned long get_ccount (void)
  49{
  50        unsigned long ccount;
  51        RSR_CCOUNT(ccount);
  52        return ccount;
  53}
  54
  55static inline void set_ccount (unsigned long ccount)
  56{
  57        WSR_CCOUNT(ccount);
  58}
  59
  60static inline unsigned long get_linux_timer (void)
  61{
  62        unsigned ccompare;
  63        RSR_CCOMPARE(LINUX_TIMER, ccompare);
  64        return ccompare;
  65}
  66
  67static inline void set_linux_timer (unsigned long ccompare)
  68{
  69        WSR_CCOMPARE(LINUX_TIMER, ccompare);
  70}
  71
  72#endif  /* _XTENSA_TIMEX_H */
  73