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 - 2005 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 INTLEVEL(XCHAL_TIMER0_INTERRUPT) == 1 23 # define LINUX_TIMER 0 24 # define LINUX_TIMER_INT XCHAL_TIMER0_INTERRUPT 25 #elif INTLEVEL(XCHAL_TIMER1_INTERRUPT) == 1 26 # define LINUX_TIMER 1 27 # define LINUX_TIMER_INT XCHAL_TIMER1_INTERRUPT 28 #elif INTLEVEL(XCHAL_TIMER2_INTERRUPT) == 1 29 # define LINUX_TIMER 2 30 # define LINUX_TIMER_INT XCHAL_TIMER2_INTERRUPT 31 #else 32 # error "Bad timer number for Linux configurations!" 33 #endif 34 35 #define LINUX_TIMER_MASK (1L << LINUX_TIMER_INT) 36 37 #define CLOCK_TICK_RATE 1193180 /* (everyone is using this value) */ 38 #define CLOCK_TICK_FACTOR 20 /* Factor of both 10^6 and CLOCK_TICK_RATE */ 39 40 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT 41 extern unsigned long ccount_per_jiffy; 42 extern unsigned long nsec_per_ccount; 43 #define CCOUNT_PER_JIFFY ccount_per_jiffy 44 #define NSEC_PER_CCOUNT nsec_per_ccount 45 #else 46 #define CCOUNT_PER_JIFFY (CONFIG_XTENSA_CPU_CLOCK*(1000000UL/HZ)) 47 #define NSEC_PER_CCOUNT (1000UL / CONFIG_XTENSA_CPU_CLOCK) 48 #endif 49 50 51 typedef unsigned long long cycles_t; 52 53 /* 54 * Only used for SMP. 55 */ 56 57 extern cycles_t cacheflush_time; 58 59 #define get_cycles() (0) 60 61 62 /* 63 * Register access. 64 */ 65 66 #define WSR_CCOUNT(r) asm volatile ("wsr %0,"__stringify(CCOUNT) :: "a" (r)) 67 #define RSR_CCOUNT(r) asm volatile ("rsr %0,"__stringify(CCOUNT) : "=a" (r)) 68 #define WSR_CCOMPARE(x,r) asm volatile ("wsr %0,"__stringify(CCOMPARE)"+"__stringify(x) :: "a"(r)) 69 #define RSR_CCOMPARE(x,r) asm volatile ("rsr %0,"__stringify(CCOMPARE)"+"__stringify(x) : "=a"(r)) 70 71 static inline unsigned long get_ccount (void) 72 { 73 unsigned long ccount; 74 RSR_CCOUNT(ccount); 75 return ccount; 76 } 77 78 static inline void set_ccount (unsigned long ccount) 79 { 80 WSR_CCOUNT(ccount); 81 } 82 83 static inline unsigned long get_linux_timer (void) 84 { 85 unsigned ccompare; 86 RSR_CCOMPARE(LINUX_TIMER, ccompare); 87 return ccompare; 88 } 89 90 static inline void set_linux_timer (unsigned long ccompare) 91 { 92 WSR_CCOMPARE(LINUX_TIMER, ccompare); 93 } 94 95 #endif /* __KERNEL__ */ 96 #endif /* _XTENSA_TIMEX_H */ 97