include/asm-xtensa/timex.h

   1 /*
   2  * include/asm-xtensa/timex.h
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 2001 - 2005 Tensilica Inc.
   9  */
  10
  11 #ifndef _XTENSA_TIMEX_H
  12 #define _XTENSA_TIMEX_H
  13
  14 #ifdef __KERNEL__
  15
  16 #include <asm/processor.h>
  17 #include <linux/stringify.h>
  18
  19 #if XCHAL_INT_LEVEL(XCHAL_TIMER0_INTERRUPT) == 1
  20 # define LINUX_TIMER     0
  21 #elif XCHAL_INT_LEVEL(XCHAL_TIMER1_INTERRUPT) == 1
  22 # define LINUX_TIMER     1
  23 #elif XCHAL_INT_LEVEL(XCHAL_TIMER2_INTERRUPT) == 1
  24 # define LINUX_TIMER     2
  25 #else
  26 # error "Bad timer number for Linux configurations!"
  27 #endif
  28
  29 #define LINUX_TIMER_INT         XCHAL_TIMER_INTERRUPT(LINUX_TIMER)
  30 #define LINUX_TIMER_MASK        (1L << LINUX_TIMER_INT)
  31
  32 #define CLOCK_TICK_RATE         1193180 /* (everyone is using this value) */
  33 #define CLOCK_TICK_FACTOR       20 /* Factor of both 10^6 and CLOCK_TICK_RATE */
  34
  35 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
  36 extern unsigned long ccount_per_jiffy;
  37 extern unsigned long ccount_nsec;
  38 #define CCOUNT_PER_JIFFY ccount_per_jiffy
  39 #define CCOUNT_NSEC ccount_nsec
  40 #else
  41 #define CCOUNT_PER_JIFFY (CONFIG_XTENSA_CPU_CLOCK*(1000000UL/HZ))
  42 #define CCOUNT_NSEC (1000000000UL / CONFIG_XTENSA_CPU_CLOCK)
  43 #endif
  44
  45
  46 typedef unsigned long long cycles_t;
  47
  48 /*
  49  * Only used for SMP.
  50  */
  51
  52 extern cycles_t cacheflush_time;
  53
  54 #define get_cycles()    (0)
  55
  56
  57 /*
  58  * Register access.
  59  */
  60
  61 #define WSR_CCOUNT(r)     __asm__("wsr %0,"__stringify(CCOUNT) :: "a" (r))
  62 #define RSR_CCOUNT(r)     __asm__("rsr %0,"__stringify(CCOUNT) : "=a" (r))
  63 #define WSR_CCOMPARE(x,r) __asm__("wsr %0,"__stringify(CCOMPARE_0)"+"__stringify(x) :: "a"(r))
  64 #define RSR_CCOMPARE(x,r) __asm__("rsr %0,"__stringify(CCOMPARE_0)"+"__stringify(x) : "=a"(r))
  65
  66 static inline unsigned long get_ccount (void)
  67 {
  68         unsigned long ccount;
  69         RSR_CCOUNT(ccount);
  70         return ccount;
  71 }
  72
  73 static inline void set_ccount (unsigned long ccount)
  74 {
  75         WSR_CCOUNT(ccount);
  76 }
  77
  78 static inline unsigned long get_linux_timer (void)
  79 {
  80         unsigned ccompare;
  81         RSR_CCOMPARE(LINUX_TIMER, ccompare);
  82         return ccompare;
  83 }
  84
  85 static inline void set_linux_timer (unsigned long ccompare)
  86 {
  87         WSR_CCOMPARE(LINUX_TIMER, ccompare);
  88 }
  89
  90 #endif  /* __KERNEL__ */
  91 #endif  /* _XTENSA_TIMEX_H */