10f7e7c15e
pSeries and maple have almost the same code for calibrate_decr, and BPA would need yet another copy. Instead, I'm moving the code to arch/ppc64/kernel/time.c. Some of the related declarations were missing from header files, so I'm moving those as well. It makes sense to merge this with the pmac function of the same name, so we end up having just one implemetation for iSeries and one for Open Firmware based machines. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul Mackerras <paulus@samba.org>
125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
/*
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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 __PPC64_TIME_H
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#define __PPC64_TIME_H
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#ifdef __KERNEL__
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/mc146818rtc.h>
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#include <asm/processor.h>
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#include <asm/paca.h>
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#include <asm/iSeries/HvCall.h>
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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 unsigned long tb_to_xs;
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extern unsigned tb_to_us;
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extern unsigned long tb_last_stamp;
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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 time_t last_rtc_update;
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void generic_calibrate_decr(void);
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void setup_default_decr(void);
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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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/*
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* By putting all of this stuff into a single struct we
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* reduce the number of cache lines touched by do_gettimeofday.
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* Both by collecting all of the data in one cache line and
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* by touching only one TOC entry
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*/
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struct gettimeofday_vars {
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unsigned long tb_to_xs;
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unsigned long stamp_xsec;
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unsigned long tb_orig_stamp;
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};
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struct gettimeofday_struct {
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unsigned long tb_ticks_per_sec;
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struct gettimeofday_vars vars[2];
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struct gettimeofday_vars * volatile varp;
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unsigned var_idx;
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unsigned tb_to_us;
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};
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struct div_result {
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unsigned long result_high;
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unsigned long result_low;
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};
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int via_calibrate_decr(void);
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static __inline__ unsigned long get_tb(void)
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{
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return mftb();
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}
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/* Accessor functions for the decrementer register. */
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static __inline__ unsigned int get_dec(void)
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{
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return (mfspr(SPRN_DEC));
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}
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static __inline__ void set_dec(int val)
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{
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#ifdef CONFIG_PPC_ISERIES
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struct paca_struct *lpaca = get_paca();
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int cur_dec;
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if (lpaca->lppaca.shared_proc) {
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lpaca->lppaca.virtual_decr = val;
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cur_dec = get_dec();
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if (cur_dec > val)
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HvCall_setVirtualDecr();
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} else
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#endif
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mtspr(SPRN_DEC, val);
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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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return get_tb() - 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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#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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unsigned mulhwu_scale_factor(unsigned, unsigned);
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void div128_by_32( unsigned long dividend_high, unsigned long 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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#endif /* __KERNEL__ */
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#endif /* __PPC64_TIME_H */
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