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 41extern unsigned long ccount_per_jiffy; 42extern 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 51typedef unsigned long long cycles_t; 52 53/* 54 * Only used for SMP. 55 */ 56 57extern 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 71static inline unsigned long get_ccount (void) 72{ 73 unsigned long ccount; 74 RSR_CCOUNT(ccount); 75 return ccount; 76} 77 78static inline void set_ccount (unsigned long ccount) 79{ 80 WSR_CCOUNT(ccount); 81} 82 83static inline unsigned long get_linux_timer (void) 84{ 85 unsigned ccompare; 86 RSR_CCOMPARE(LINUX_TIMER, ccompare); 87 return ccompare; 88} 89 90static 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