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 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT 39 extern unsigned long ccount_freq; 40 #define CCOUNT_PER_JIFFY (ccount_freq / HZ) 41 #else 42 #define CCOUNT_PER_JIFFY (CONFIG_XTENSA_CPU_CLOCK*(1000000UL/HZ)) 43 #endif 44 45 46 typedef unsigned long long cycles_t; 47 48 /* 49 * Only used for SMP. 50 */ 51 52 extern cycles_t cacheflush_time; 53 54 #define get_cycles() (0) 55 56 57 /* 58 * Register access. 59 */ 60 61 #define WSR_CCOUNT(r) asm volatile ("wsr %0, ccount" :: "a" (r)) 62 #define RSR_CCOUNT(r) asm volatile ("rsr %0, ccount" : "=a" (r)) 63 #define WSR_CCOMPARE(x,r) asm volatile ("wsr %0,"__stringify(SREG_CCOMPARE)"+"__stringify(x) :: "a"(r)) 64 #define RSR_CCOMPARE(x,r) asm volatile ("rsr %0,"__stringify(SREG_CCOMPARE)"+"__stringify(x) : "=a"(r)) 65 66 static inline unsigned long get_ccount (void) 67 { 68 unsigned long ccount; 69 RSR_CCOUNT(ccount); 70 return ccount; 71 } 72 73 static inline void set_ccount (unsigned long ccount) 74 { 75 WSR_CCOUNT(ccount); 76 } 77 78 static inline unsigned long get_linux_timer (void) 79 { 80 unsigned ccompare; 81 RSR_CCOMPARE(LINUX_TIMER, ccompare); 82 return ccompare; 83 } 84 85 static inline void set_linux_timer (unsigned long ccompare) 86 { 87 WSR_CCOMPARE(LINUX_TIMER, ccompare); 88 } 89 90 #endif /* __KERNEL__ */ 91 #endif /* _XTENSA_TIMEX_H */ 92