236 lines
5.5 KiB
C
236 lines
5.5 KiB
C
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/*
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* Common time prototypes and such for all ppc machines.
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*
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* Written by Cort Dougan (cort@cs.nmt.edu) to merge
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* Paul Mackerras' version and mine for PReP and Pmac.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef __POWERPC_TIME_H
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#define __POWERPC_TIME_H
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#ifdef __KERNEL__
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#include <linux/types.h>
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#include <linux/percpu.h>
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#include <asm/processor.h>
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#ifdef CONFIG_PPC_ISERIES
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#include <asm/paca.h>
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#include <asm/firmware.h>
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#include <asm/iseries/hv_call.h>
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#endif
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/* time.c */
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extern unsigned long tb_ticks_per_jiffy;
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extern unsigned long tb_ticks_per_usec;
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extern unsigned long tb_ticks_per_sec;
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extern u64 tb_to_xs;
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extern unsigned tb_to_us;
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struct rtc_time;
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extern void to_tm(int tim, struct rtc_time * tm);
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extern void GregorianDay(struct rtc_time *tm);
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extern time_t last_rtc_update;
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extern void generic_calibrate_decr(void);
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extern void wakeup_decrementer(void);
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extern void snapshot_timebase(void);
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extern void set_dec_cpu6(unsigned int val);
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/* Some sane defaults: 125 MHz timebase, 1GHz processor */
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extern unsigned long ppc_proc_freq;
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#define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8)
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extern unsigned long ppc_tb_freq;
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#define DEFAULT_TB_FREQ 125000000UL
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struct div_result {
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u64 result_high;
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u64 result_low;
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};
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/* Accessor functions for the timebase (RTC on 601) registers. */
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/* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
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#ifdef CONFIG_6xx
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#define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB))
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#else
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#define __USE_RTC() 0
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#endif
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#ifdef CONFIG_PPC64
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/* For compatibility, get_tbl() is defined as get_tb() on ppc64 */
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#define get_tbl get_tb
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#else
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static inline unsigned long get_tbl(void)
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{
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#if defined(CONFIG_403GCX)
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unsigned long tbl;
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asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
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return tbl;
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#else
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return mftbl();
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#endif
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}
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static inline unsigned int get_tbu(void)
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{
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#ifdef CONFIG_403GCX
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unsigned int tbu;
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asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
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return tbu;
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#else
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return mftbu();
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#endif
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}
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#endif /* !CONFIG_PPC64 */
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static inline unsigned int get_rtcl(void)
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{
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unsigned int rtcl;
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asm volatile("mfrtcl %0" : "=r" (rtcl));
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return rtcl;
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}
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static inline u64 get_rtc(void)
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{
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unsigned int hi, lo, hi2;
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do {
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asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
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: "=r" (hi), "=r" (lo), "=r" (hi2));
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} while (hi2 != hi);
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return (u64)hi * 1000000000 + lo;
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}
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#ifdef CONFIG_PPC64
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static inline u64 get_tb(void)
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{
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return mftb();
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}
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#else /* CONFIG_PPC64 */
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static inline u64 get_tb(void)
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{
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unsigned int tbhi, tblo, tbhi2;
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do {
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tbhi = get_tbu();
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tblo = get_tbl();
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tbhi2 = get_tbu();
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} while (tbhi != tbhi2);
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return ((u64)tbhi << 32) | tblo;
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}
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#endif /* !CONFIG_PPC64 */
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static inline u64 get_tb_or_rtc(void)
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{
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return __USE_RTC() ? get_rtc() : get_tb();
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}
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static inline void set_tb(unsigned int upper, unsigned int lower)
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{
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mtspr(SPRN_TBWL, 0);
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mtspr(SPRN_TBWU, upper);
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mtspr(SPRN_TBWL, lower);
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}
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/* Accessor functions for the decrementer register.
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* The 4xx doesn't even have a decrementer. I tried to use the
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* generic timer interrupt code, which seems OK, with the 4xx PIT
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* in auto-reload mode. The problem is PIT stops counting when it
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* hits zero. If it would wrap, we could use it just like a decrementer.
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*/
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static inline unsigned int get_dec(void)
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{
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#if defined(CONFIG_40x)
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return (mfspr(SPRN_PIT));
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#else
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return (mfspr(SPRN_DEC));
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#endif
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}
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/*
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* Note: Book E and 4xx processors differ from other PowerPC processors
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* in when the decrementer generates its interrupt: on the 1 to 0
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* transition for Book E/4xx, but on the 0 to -1 transition for others.
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*/
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static inline void set_dec(int val)
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{
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#if defined(CONFIG_40x)
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mtspr(SPRN_PIT, val);
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#elif defined(CONFIG_8xx_CPU6)
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set_dec_cpu6(val - 1);
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#else
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#ifndef CONFIG_BOOKE
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--val;
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#endif
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#ifdef CONFIG_PPC_ISERIES
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if (firmware_has_feature(FW_FEATURE_ISERIES) &&
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get_lppaca()->shared_proc) {
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get_lppaca()->virtual_decr = val;
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if (get_dec() > val)
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HvCall_setVirtualDecr();
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return;
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}
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#endif
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mtspr(SPRN_DEC, val);
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#endif /* not 40x or 8xx_CPU6 */
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}
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static inline unsigned long tb_ticks_since(unsigned long tstamp)
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{
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if (__USE_RTC()) {
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int delta = get_rtcl() - (unsigned int) tstamp;
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return delta < 0 ? delta + 1000000000 : delta;
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}
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return get_tbl() - tstamp;
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}
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#define mulhwu(x,y) \
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({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
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#ifdef CONFIG_PPC64
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#define mulhdu(x,y) \
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({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
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#else
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extern u64 mulhdu(u64, u64);
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#endif
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extern void smp_space_timers(unsigned int);
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extern unsigned mulhwu_scale_factor(unsigned, unsigned);
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extern void div128_by_32(u64 dividend_high, u64 dividend_low,
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unsigned divisor, struct div_result *dr);
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/* Used to store Processor Utilization register (purr) values */
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struct cpu_usage {
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u64 current_tb; /* Holds the current purr register values */
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};
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DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
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#if defined(CONFIG_VIRT_CPU_ACCOUNTING)
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extern void calculate_steal_time(void);
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extern void snapshot_timebases(void);
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#define account_process_vtime(tsk) account_process_tick(tsk, 0)
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#else
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#define calculate_steal_time() do { } while (0)
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#define snapshot_timebases() do { } while (0)
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#define account_process_vtime(tsk) do { } while (0)
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#endif
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extern void secondary_cpu_time_init(void);
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extern void iSeries_time_init_early(void);
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#endif /* __KERNEL__ */
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#endif /* __POWERPC_TIME_H */
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