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 #define FINETUNE ((((((long)LATCH * HZ - CLOCK_TICK_RATE) << SHIFT_HZ) * \
  35         (1000000/CLOCK_TICK_FACTOR) / (CLOCK_TICK_RATE/CLOCK_TICK_FACTOR)) \
  36                 << (SHIFT_SCALE-SHIFT_HZ)) / HZ)
  37
  38 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
  39 extern unsigned long ccount_per_jiffy;
  40 extern unsigned long ccount_nsec;
  41 #define CCOUNT_PER_JIFFY ccount_per_jiffy
  42 #define CCOUNT_NSEC ccount_nsec
  43 #else
  44 #define CCOUNT_PER_JIFFY (CONFIG_XTENSA_CPU_CLOCK*(1000000UL/HZ))
  45 #define CCOUNT_NSEC (1000000000UL / CONFIG_XTENSA_CPU_CLOCK)
  46 #endif
  47
  48
  49 typedef unsigned long long cycles_t;
  50
  51 /*
  52  * Only used for SMP.
  53  */
  54
  55 extern cycles_t cacheflush_time;
  56
  57 #define get_cycles()    (0)
  58
  59
  60 /*
  61  * Register access.
  62  */
  63
  64 #define WSR_CCOUNT(r)     __asm__("wsr %0,"__stringify(CCOUNT) :: "a" (r))
  65 #define RSR_CCOUNT(r)     __asm__("rsr %0,"__stringify(CCOUNT) : "=a" (r))
  66 #define WSR_CCOMPARE(x,r) __asm__("wsr %0,"__stringify(CCOMPARE_0)"+"__stringify(x) :: "a"(r))
  67 #define RSR_CCOMPARE(x,r) __asm__("rsr %0,"__stringify(CCOMPARE_0)"+"__stringify(x) : "=a"(r))
  68
  69 static inline unsigned long get_ccount (void)
  70 {
  71         unsigned long ccount;
  72         RSR_CCOUNT(ccount);
  73         return ccount;
  74 }
  75
  76 static inline void set_ccount (unsigned long ccount)
  77 {
  78         WSR_CCOUNT(ccount);
  79 }
  80
  81 static inline unsigned long get_linux_timer (void)
  82 {
  83         unsigned ccompare;
  84         RSR_CCOMPARE(LINUX_TIMER, ccompare);
  85         return ccompare;
  86 }
  87
  88 static inline void set_linux_timer (unsigned long ccompare)
  89 {
  90         WSR_CCOMPARE(LINUX_TIMER, ccompare);
  91 }
  92
  93 #endif  /* __KERNEL__ */
  94 #endif  /* _XTENSA_TIMEX_H */