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/*
* Common time prototypes and such for all ppc machines.
*
* Written by Cort Dougan (cort@cs.nmt.edu) to merge
* Paul Mackerras' version and mine for PReP and Pmac.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifndef __POWERPC_TIME_H
#define __POWERPC_TIME_H
#ifdef __KERNEL__
#include <linux/config.h>
#include <linux/types.h>
#include <linux/percpu.h>
#include <asm/processor.h>
#ifdef CONFIG_PPC64
#include <asm/paca.h>
#include <asm/iSeries/HvCall.h>
#endif
/* time.c */
extern unsigned long tb_ticks_per_jiffy;
extern unsigned long tb_ticks_per_usec;
extern unsigned long tb_ticks_per_sec;
extern u64 tb_to_xs;
extern unsigned tb_to_us;
extern u64 tb_last_stamp;
DECLARE_PER_CPU(unsigned long, last_jiffy);
struct rtc_time;
extern void to_tm(int tim, struct rtc_time * tm);
extern time_t last_rtc_update;
extern void generic_calibrate_decr(void);
extern void wakeup_decrementer(void);
/* Some sane defaults: 125 MHz timebase, 1GHz processor */
extern unsigned long ppc_proc_freq;
#define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8)
extern unsigned long ppc_tb_freq;
#define DEFAULT_TB_FREQ 125000000UL
/*
* By putting all of this stuff into a single struct we
* reduce the number of cache lines touched by do_gettimeofday.
* Both by collecting all of the data in one cache line and
* by touching only one TOC entry on ppc64.
*/
struct gettimeofday_vars {
u64 tb_to_xs;
u64 stamp_xsec;
u64 tb_orig_stamp;
};
struct gettimeofday_struct {
unsigned long tb_ticks_per_sec;
struct gettimeofday_vars vars[2];
struct gettimeofday_vars * volatile varp;
unsigned var_idx;
unsigned tb_to_us;
};
struct div_result {
u64 result_high;
u64 result_low;
};
/* 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
#define __USE_RTC() cpu_has_feature(CPU_FTR_USE_TB)
#else
#define __USE_RTC() 0
#endif
/* On ppc64 this gets us the whole timebase; on ppc32 just the lower half */
static 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;
}
static inline unsigned int get_tbu(void)
{
unsigned int tbu;
#if defined(CONFIG_403GCX)
asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
#else
asm volatile("mftbu %0" : "=r" (tbu));
#endif
return tbu;
}
static inline unsigned int get_rtcl(void)
{
unsigned int rtcl;
asm volatile("mfrtcl %0" : "=r" (rtcl));
return rtcl;
}
#ifdef CONFIG_PPC64
static inline u64 get_tb(void)
{
return mftb();
}
#else
static inline u64 get_tb(void)
{
unsigned int tbhi, tblo, tbhi2;
do {
tbhi = get_tbu();
tblo = get_tbl();
tbhi2 = get_tbu();
} while (tbhi != tbhi2);
return ((u64)tbhi << 32) | tblo;
}
#endif
static inline void set_tb(unsigned int upper, unsigned int lower)
{
mtspr(SPRN_TBWL, 0);
mtspr(SPRN_TBWU, upper);
mtspr(SPRN_TBWL, lower);
}
/* 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(int val)
{
#if defined(CONFIG_40x)
return; /* Have to let it auto-reload */
#elif defined(CONFIG_8xx_CPU6)
set_dec_cpu6(val);
#else
#ifdef CONFIG_PPC_ISERIES
struct paca_struct *lpaca = get_paca();
int cur_dec;
if (lpaca->lppaca.shared_proc) {
lpaca->lppaca.virtual_decr = val;
cur_dec = get_dec();
if (cur_dec > val)
HvCall_setVirtualDecr();
} else
#endif
mtspr(SPRN_DEC, val);
#endif /* not 40x or 8xx_CPU6 */
}
static inline unsigned long tb_ticks_since(unsigned long tstamp)
{
if (__USE_RTC()) {
int delta = get_rtcl() - (unsigned int) tstamp;
return delta < 0 ? delta + 1000000000 : delta;
}
return get_tbl() - tstamp;
}
#define mulhwu(x,y) \
({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
#ifdef CONFIG_PPC64
#define mulhdu(x,y) \
({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
#else
extern u64 mulhdu(u64, u64);
#endif
unsigned mulhwu_scale_factor(unsigned, unsigned);
void div128_by_32(u64 dividend_high, u64 dividend_low,
unsigned divisor, struct div_result *dr);
/* Used to store Processor Utilization register (purr) values */
struct cpu_usage {
u64 current_tb; /* Holds the current purr register values */
};
DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
#endif /* __KERNEL__ */
#endif /* __PPC64_TIME_H */
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