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 */ 86