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 #define _INTLEVEL(x)    XCHAL_INT ## x ## _LEVEL
  16 #define INTLEVEL(x)     _INTLEVEL(x)
  17
  18 #if XCHAL_NUM_TIMERS > 0 && \
  19         INTLEVEL(XCHAL_TIMER0_INTERRUPT) <= XCHAL_EXCM_LEVEL
  20 # define LINUX_TIMER     0
  21 # define LINUX_TIMER_INT XCHAL_TIMER0_INTERRUPT
  22 #elif XCHAL_NUM_TIMERS > 1 && \
  23         INTLEVEL(XCHAL_TIMER1_INTERRUPT) <= XCHAL_EXCM_LEVEL
  24 # define LINUX_TIMER     1
  25 # define LINUX_TIMER_INT XCHAL_TIMER1_INTERRUPT
  26 #elif XCHAL_NUM_TIMERS > 2 && \
  27         INTLEVEL(XCHAL_TIMER2_INTERRUPT) <= XCHAL_EXCM_LEVEL
  28 # define LINUX_TIMER     2
  29 # define LINUX_TIMER_INT XCHAL_TIMER2_INTERRUPT
  30 #else
  31 # error "Bad timer number for Linux configurations!"
  32 #endif
  33
  34 extern unsigned long ccount_freq;
  35
  36 typedef unsigned long long cycles_t;
  37
  38 #define get_cycles()    (0)
  39
  40 void local_timer_setup(unsigned cpu);
  41
  42 /*
  43  * Register access.
  44  */
  45
  46 #define WSR_CCOUNT(r)     asm volatile ("wsr %0, ccount" :: "a" (r))
  47 #define RSR_CCOUNT(r)     asm volatile ("rsr %0, ccount" : "=a" (r))
  48 #define WSR_CCOMPARE(x,r) asm volatile ("wsr %0,"__stringify(SREG_CCOMPARE)"+"__stringify(x) :: "a"(r))
  49 #define RSR_CCOMPARE(x,r) asm volatile ("rsr %0,"__stringify(SREG_CCOMPARE)"+"__stringify(x) : "=a"(r))
  50
  51 static inline unsigned long get_ccount (void)
  52 {
  53         unsigned long ccount;
  54         RSR_CCOUNT(ccount);
  55         return ccount;
  56 }
  57
  58 static inline void set_ccount (unsigned long ccount)
  59 {
  60         WSR_CCOUNT(ccount);
  61 }
  62
  63 static inline unsigned long get_linux_timer (void)
  64 {
  65         unsigned ccompare;
  66         RSR_CCOMPARE(LINUX_TIMER, ccompare);
  67         return ccompare;
  68 }
  69
  70 static inline void set_linux_timer (unsigned long ccompare)
  71 {
  72         WSR_CCOMPARE(LINUX_TIMER, ccompare);
  73 }
  74
  75 #endif  /* _XTENSA_TIMEX_H */