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