/* * Common time prototypes and such for all ppc machines. * * Written by Cort Dougan (cort@fsmlabs.com) to merge * Paul Mackerras' version and mine for PReP and Pmac. */ #ifdef __KERNEL__ #ifndef __ASM_TIME_H__ #define __ASM_TIME_H__ #include <linux/config.h> #include <linux/types.h> #include <linux/rtc.h> #include <linux/threads.h> #include <asm/reg.h> /* time.c */ extern unsigned tb_ticks_per_jiffy; extern unsigned tb_to_us; extern unsigned tb_last_stamp; extern unsigned long disarm_decr[NR_CPUS]; extern void to_tm(int tim, struct rtc_time * tm); extern time_t last_rtc_update; extern void set_dec_cpu6(unsigned int val); int via_calibrate_decr(void); /* Accessor functions for the decrementer register. * The 4xx doesn't even have a decrementer. I tried to use the * generic timer interrupt code, which seems OK, with the 4xx PIT * in auto-reload mode. The problem is PIT stops counting when it * hits zero. If it would wrap, we could use it just like a decrementer. */ static __inline__ unsigned int get_dec(void) { #if defined(CONFIG_40x) return (mfspr(SPRN_PIT)); #else return (mfspr(SPRN_DEC)); #endif } static __inline__ void set_dec(unsigned int val) { #if defined(CONFIG_40x) return; /* Have to let it auto-reload */ #elif defined(CONFIG_8xx_CPU6) set_dec_cpu6(val); #else mtspr(SPRN_DEC, val); #endif } /* Accessor functions for the timebase (RTC on 601) registers. */ /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */ #ifdef CONFIG_6xx extern __inline__ int __attribute_pure__ __USE_RTC(void) { return (mfspr(SPRN_PVR)>>16) == 1; } #else #define __USE_RTC() 0 #endif extern __inline__ unsigned long get_tbl(void) { unsigned long tbl; #if defined(CONFIG_403GCX) asm volatile("mfspr %0, 0x3dd" : "=r" (tbl)); #else asm volatile("mftb %0" : "=r" (tbl)); #endif return tbl; } extern __inline__ unsigned long get_tbu(void) { unsigned long tbl; #if defined(CONFIG_403GCX) asm volatile("mfspr %0, 0x3dc" : "=r" (tbl)); #else asm volatile("mftbu %0" : "=r" (tbl)); #endif return tbl; } extern __inline__ void set_tb(unsigned int upper, unsigned int lower) { mtspr(SPRN_TBWL, 0); mtspr(SPRN_TBWU, upper); mtspr(SPRN_TBWL, lower); } extern __inline__ unsigned long get_rtcl(void) { unsigned long rtcl; asm volatile("mfrtcl %0" : "=r" (rtcl)); return rtcl; } extern __inline__ unsigned long get_rtcu(void) { unsigned long rtcu; asm volatile("mfrtcu %0" : "=r" (rtcu)); return rtcu; } extern __inline__ unsigned get_native_tbl(void) { if (__USE_RTC()) return get_rtcl(); else return get_tbl(); } /* On machines with RTC, this function can only be used safely * after the timestamp and for 1 second. It is only used by gettimeofday * however so it should not matter. */ extern __inline__ unsigned tb_ticks_since(unsigned tstamp) { if (__USE_RTC()) { int delta = get_rtcl() - tstamp; return delta<0 ? delta + 1000000000 : delta; } else { return get_tbl() - tstamp; } } #if 0 extern __inline__ unsigned long get_bin_rtcl(void) { unsigned long rtcl, rtcu1, rtcu2; asm volatile("\ 1: mfrtcu %0\n\ mfrtcl %1\n\ mfrtcu %2\n\ cmpw %0,%2\n\ bne- 1b\n" : "=r" (rtcu1), "=r" (rtcl), "=r" (rtcu2) : : "cr0"); return rtcu2*1000000000+rtcl; } extern __inline__ unsigned binary_tbl(void) { if (__USE_RTC()) return get_bin_rtcl(); else return get_tbl(); } #endif /* Use mulhwu to scale processor timebase to timeval */ /* Specifically, this computes (x * y) / 2^32. -- paulus */ #define mulhwu(x,y) \ ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) unsigned mulhwu_scale_factor(unsigned, unsigned); #endif /* __ASM_TIME_H__ */ #endif /* __KERNEL__ */