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 #define LINUX_TIMER_MASK (1L << LINUX_TIMER_INT) 39 40 #define CLOCK_TICK_RATE 1193180 /* (everyone is using this value) */ 41 #define CLOCK_TICK_FACTOR 20 /* Factor of both 10^6 and CLOCK_TICK_RATE */ 42 43 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT 44 extern unsigned long ccount_per_jiffy; 45 extern unsigned long nsec_per_ccount; 46 #define CCOUNT_PER_JIFFY ccount_per_jiffy 47 #define NSEC_PER_CCOUNT nsec_per_ccount 48 #else 49 #define CCOUNT_PER_JIFFY (CONFIG_XTENSA_CPU_CLOCK*(1000000UL/HZ)) 50 #define NSEC_PER_CCOUNT (1000UL / CONFIG_XTENSA_CPU_CLOCK) 51 #endif 52 53 54 typedef unsigned long long cycles_t; 55 56 /* 57 * Only used for SMP. 58 */ 59 60 extern cycles_t cacheflush_time; 61 62 #define get_cycles() (0) 63 64 65 /* 66 * Register access. 67 */ 68 69 #define WSR_CCOUNT(r) asm volatile ("wsr %0, ccount" :: "a" (r)) 70 #define RSR_CCOUNT(r) asm volatile ("rsr %0, ccount" : "=a" (r)) 71 #define WSR_CCOMPARE(x,r) asm volatile ("wsr %0,"__stringify(SREG_CCOMPARE)"+"__stringify(x) :: "a"(r)) 72 #define RSR_CCOMPARE(x,r) asm volatile ("rsr %0,"__stringify(SREG_CCOMPARE)"+"__stringify(x) : "=a"(r)) 73 74 static inline unsigned long get_ccount (void) 75 { 76 unsigned long ccount; 77 RSR_CCOUNT(ccount); 78 return ccount; 79 } 80 81 static inline void set_ccount (unsigned long ccount) 82 { 83 WSR_CCOUNT(ccount); 84 } 85 86 static inline unsigned long get_linux_timer (void) 87 { 88 unsigned ccompare; 89 RSR_CCOMPARE(LINUX_TIMER, ccompare); 90 return ccompare; 91 } 92 93 static inline void set_linux_timer (unsigned long ccompare) 94 { 95 WSR_CCOMPARE(LINUX_TIMER, ccompare); 96 } 97 98 #endif /* __KERNEL__ */ 99 #endif /* _XTENSA_TIMEX_H */ 100