arch/xtensa/include/asm/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 #define _INTLEVEL(x)    XCHAL_INT ## x ## _LEVEL
  20 #define INTLEVEL(x)     _INTLEVEL(x)
  21
  22 #if INTLEVEL(XCHAL_TIMER0_INTERRUPT) == 1
  23 # define LINUX_TIMER     0
  24 # define LINUX_TIMER_INT XCHAL_TIMER0_INTERRUPT
  25 #elif INTLEVEL(XCHAL_TIMER1_INTERRUPT) == 1
  26 # define LINUX_TIMER     1
  27 # define LINUX_TIMER_INT XCHAL_TIMER1_INTERRUPT
  28 #elif INTLEVEL(XCHAL_TIMER2_INTERRUPT) == 1
  29 # define LINUX_TIMER     2
  30 # define LINUX_TIMER_INT XCHAL_TIMER2_INTERRUPT
  31 #else
  32 # error "Bad timer number for Linux configurations!"
  33 #endif
  34
  35 #define LINUX_TIMER_MASK        (1L << LINUX_TIMER_INT)
  36
  37 #define CLOCK_TICK_RATE         1193180 /* (everyone is using this value) */
  38 #define CLOCK_TICK_FACTOR       20 /* Factor of both 10^6 and CLOCK_TICK_RATE */
  39
  40 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
  41 extern unsigned long ccount_per_jiffy;
  42 extern unsigned long nsec_per_ccount;
  43 #define CCOUNT_PER_JIFFY ccount_per_jiffy
  44 #define NSEC_PER_CCOUNT  nsec_per_ccount
  45 #else
  46 #define CCOUNT_PER_JIFFY (CONFIG_XTENSA_CPU_CLOCK*(1000000UL/HZ))
  47 #define NSEC_PER_CCOUNT (1000UL / CONFIG_XTENSA_CPU_CLOCK)
  48 #endif
  49
  50
  51 typedef unsigned long long cycles_t;
  52
  53 /*
  54  * Only used for SMP.
  55  */
  56
  57 extern cycles_t cacheflush_time;
  58
  59 #define get_cycles()    (0)
  60
  61
  62 /*
  63  * Register access.
  64  */
  65
  66 #define WSR_CCOUNT(r)     asm volatile ("wsr %0, ccount" :: "a" (r))
  67 #define RSR_CCOUNT(r)     asm volatile ("rsr %0, ccount" : "=a" (r))
  68 #define WSR_CCOMPARE(x,r) asm volatile ("wsr %0,"__stringify(SREG_CCOMPARE)"+"__stringify(x) :: "a"(r))
  69 #define RSR_CCOMPARE(x,r) asm volatile ("rsr %0,"__stringify(SREG_CCOMPARE)"+"__stringify(x) : "=a"(r))
  70
  71 static inline unsigned long get_ccount (void)
  72 {
  73         unsigned long ccount;
  74         RSR_CCOUNT(ccount);
  75         return ccount;
  76 }
  77
  78 static inline void set_ccount (unsigned long ccount)
  79 {
  80         WSR_CCOUNT(ccount);
  81 }
  82
  83 static inline unsigned long get_linux_timer (void)
  84 {
  85         unsigned ccompare;
  86         RSR_CCOMPARE(LINUX_TIMER, ccompare);
  87         return ccompare;
  88 }
  89
  90 static inline void set_linux_timer (unsigned long ccompare)
  91 {
  92         WSR_CCOMPARE(LINUX_TIMER, ccompare);
  93 }
  94
  95 #endif  /* __KERNEL__ */
  96 #endif  /* _XTENSA_TIMEX_H */