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 - 2008 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 XCHAL_NUM_TIMERS > 0 && \
  23         INTLEVEL(XCHAL_TIMER0_INTERRUPT) <= XCHAL_EXCM_LEVEL
  24 # define LINUX_TIMER     0
  25 # define LINUX_TIMER_INT XCHAL_TIMER0_INTERRUPT
  26 #elif XCHAL_NUM_TIMERS > 1 && \
  27         INTLEVEL(XCHAL_TIMER1_INTERRUPT) <= XCHAL_EXCM_LEVEL
  28 # define LINUX_TIMER     1
  29 # define LINUX_TIMER_INT XCHAL_TIMER1_INTERRUPT
  30 #elif XCHAL_NUM_TIMERS > 2 && \
  31         INTLEVEL(XCHAL_TIMER2_INTERRUPT) <= XCHAL_EXCM_LEVEL
  32 # define LINUX_TIMER     2
  33 # define LINUX_TIMER_INT XCHAL_TIMER2_INTERRUPT
  34 #else
  35 # error "Bad timer number for Linux configurations!"
  36 #endif
  37
  38 extern unsigned long ccount_freq;
  39
  40 typedef unsigned long long cycles_t;
  41
  42 /*
  43  * Only used for SMP.
  44  */
  45
  46 extern cycles_t cacheflush_time;
  47
  48 #define get_cycles()    (0)
  49
  50
  51 /*
  52  * Register access.
  53  */
  54
  55 #define WSR_CCOUNT(r)     asm volatile ("wsr %0, ccount" :: "a" (r))
  56 #define RSR_CCOUNT(r)     asm volatile ("rsr %0, ccount" : "=a" (r))
  57 #define WSR_CCOMPARE(x,r) asm volatile ("wsr %0,"__stringify(SREG_CCOMPARE)"+"__stringify(x) :: "a"(r))
  58 #define RSR_CCOMPARE(x,r) asm volatile ("rsr %0,"__stringify(SREG_CCOMPARE)"+"__stringify(x) : "=a"(r))
  59
  60 static inline unsigned long get_ccount (void)
  61 {
  62         unsigned long ccount;
  63         RSR_CCOUNT(ccount);
  64         return ccount;
  65 }
  66
  67 static inline void set_ccount (unsigned long ccount)
  68 {
  69         WSR_CCOUNT(ccount);
  70 }
  71
  72 static inline unsigned long get_linux_timer (void)
  73 {
  74         unsigned ccompare;
  75         RSR_CCOMPARE(LINUX_TIMER, ccompare);
  76         return ccompare;
  77 }
  78
  79 static inline void set_linux_timer (unsigned long ccompare)
  80 {
  81         WSR_CCOMPARE(LINUX_TIMER, ccompare);
  82 }
  83
  84 #endif  /* __KERNEL__ */
  85 #endif  /* _XTENSA_TIMEX_H */