1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 2001 - 2013 Tensilica Inc. 7 */ 8 9 #ifndef _XTENSA_TIMEX_H 10 #define _XTENSA_TIMEX_H 11 12 #include <asm/processor.h> 13 #include <linux/stringify.h> 14 15 #if XCHAL_NUM_TIMERS > 0 && \ 16 XTENSA_INT_LEVEL(XCHAL_TIMER0_INTERRUPT) <= XCHAL_EXCM_LEVEL 17 # define LINUX_TIMER 0 18 # define LINUX_TIMER_INT XCHAL_TIMER0_INTERRUPT 19 #elif XCHAL_NUM_TIMERS > 1 && \ 20 XTENSA_INT_LEVEL(XCHAL_TIMER1_INTERRUPT) <= XCHAL_EXCM_LEVEL 21 # define LINUX_TIMER 1 22 # define LINUX_TIMER_INT XCHAL_TIMER1_INTERRUPT 23 #elif XCHAL_NUM_TIMERS > 2 && \ 24 XTENSA_INT_LEVEL(XCHAL_TIMER2_INTERRUPT) <= XCHAL_EXCM_LEVEL 25 # define LINUX_TIMER 2 26 # define LINUX_TIMER_INT XCHAL_TIMER2_INTERRUPT 27 #else 28 # error "Bad timer number for Linux configurations!" 29 #endif 30 31 extern unsigned long ccount_freq; 32 33 typedef unsigned long long cycles_t; 34 35 #define get_cycles() (0) 36 37 void local_timer_setup(unsigned cpu); 38 39 /* 40 * Register access. 41 */ 42 43 #define WSR_CCOUNT(r) asm volatile ("wsr %0, ccount" :: "a" (r)) 44 #define RSR_CCOUNT(r) asm volatile ("rsr %0, ccount" : "=a" (r)) 45 #define WSR_CCOMPARE(x,r) asm volatile ("wsr %0,"__stringify(SREG_CCOMPARE)"+"__stringify(x) :: "a"(r)) 46 #define RSR_CCOMPARE(x,r) asm volatile ("rsr %0,"__stringify(SREG_CCOMPARE)"+"__stringify(x) : "=a"(r)) 47 48 static inline unsigned long get_ccount (void) 49 { 50 unsigned long ccount; 51 RSR_CCOUNT(ccount); 52 return ccount; 53 } 54 55 static inline void set_ccount (unsigned long ccount) 56 { 57 WSR_CCOUNT(ccount); 58 } 59 60 static inline unsigned long get_linux_timer (void) 61 { 62 unsigned ccompare; 63 RSR_CCOMPARE(LINUX_TIMER, ccompare); 64 return ccompare; 65 } 66 67 static inline void set_linux_timer (unsigned long ccompare) 68 { 69 WSR_CCOMPARE(LINUX_TIMER, ccompare); 70 } 71 72 #endif /* _XTENSA_TIMEX_H */ 73