2 * Common time prototypes and such for all ppc machines.
4 * Written by Cort Dougan (cort@cs.nmt.edu) to merge
5 * Paul Mackerras' version and mine for PReP and Pmac.
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
13 #ifndef __POWERPC_TIME_H
14 #define __POWERPC_TIME_H
17 #include <linux/types.h>
18 #include <linux/percpu.h>
20 #include <asm/processor.h>
21 #ifdef CONFIG_PPC_ISERIES
23 #include <asm/firmware.h>
24 #include <asm/iseries/hv_call.h>
28 extern unsigned long tb_ticks_per_jiffy
;
29 extern unsigned long tb_ticks_per_usec
;
30 extern unsigned long tb_ticks_per_sec
;
32 extern unsigned tb_to_us
;
35 extern void to_tm(int tim
, struct rtc_time
* tm
);
36 extern time_t last_rtc_update
;
38 extern void generic_calibrate_decr(void);
39 extern void wakeup_decrementer(void);
40 extern void snapshot_timebase(void);
42 #ifdef CONFIG_RTC_CLASS
43 extern int __init
rtc_class_hookup(void);
46 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
47 extern unsigned long ppc_proc_freq
;
48 #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8)
49 extern unsigned long ppc_tb_freq
;
50 #define DEFAULT_TB_FREQ 125000000UL
53 * By putting all of this stuff into a single struct we
54 * reduce the number of cache lines touched by do_gettimeofday.
55 * Both by collecting all of the data in one cache line and
56 * by touching only one TOC entry on ppc64.
58 struct gettimeofday_vars
{
64 struct gettimeofday_struct
{
65 unsigned long tb_ticks_per_sec
;
66 struct gettimeofday_vars vars
[2];
67 struct gettimeofday_vars
* volatile varp
;
77 /* Accessor functions for the timebase (RTC on 601) registers. */
78 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
80 #define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB))
87 /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */
88 #define get_tbl get_tb
92 static inline unsigned long get_tbl(void)
94 #if defined(CONFIG_403GCX)
96 asm volatile("mfspr %0, 0x3dd" : "=r" (tbl
));
103 static inline unsigned int get_tbu(void)
107 asm volatile("mfspr %0, 0x3dc" : "=r" (tbu
));
113 #endif /* !CONFIG_PPC64 */
115 static inline unsigned int get_rtcl(void)
119 asm volatile("mfrtcl %0" : "=r" (rtcl
));
123 static inline u64
get_rtc(void)
125 unsigned int hi
, lo
, hi2
;
128 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
129 : "=r" (hi
), "=r" (lo
), "=r" (hi2
));
131 return (u64
)hi
* 1000000000 + lo
;
135 static inline u64
get_tb(void)
139 #else /* CONFIG_PPC64 */
140 static inline u64
get_tb(void)
142 unsigned int tbhi
, tblo
, tbhi2
;
148 } while (tbhi
!= tbhi2
);
150 return ((u64
)tbhi
<< 32) | tblo
;
152 #endif /* !CONFIG_PPC64 */
154 static inline void set_tb(unsigned int upper
, unsigned int lower
)
157 mtspr(SPRN_TBWU
, upper
);
158 mtspr(SPRN_TBWL
, lower
);
161 /* Accessor functions for the decrementer register.
162 * The 4xx doesn't even have a decrementer. I tried to use the
163 * generic timer interrupt code, which seems OK, with the 4xx PIT
164 * in auto-reload mode. The problem is PIT stops counting when it
165 * hits zero. If it would wrap, we could use it just like a decrementer.
167 static inline unsigned int get_dec(void)
169 #if defined(CONFIG_40x)
170 return (mfspr(SPRN_PIT
));
172 return (mfspr(SPRN_DEC
));
176 static inline void set_dec(int val
)
178 #if defined(CONFIG_40x)
179 return; /* Have to let it auto-reload */
180 #elif defined(CONFIG_8xx_CPU6)
183 #ifdef CONFIG_PPC_ISERIES
186 if (firmware_has_feature(FW_FEATURE_ISERIES
) &&
187 get_lppaca()->shared_proc
) {
188 get_lppaca()->virtual_decr
= val
;
191 HvCall_setVirtualDecr();
194 mtspr(SPRN_DEC
, val
);
195 #endif /* not 40x or 8xx_CPU6 */
198 static inline unsigned long tb_ticks_since(unsigned long tstamp
)
201 int delta
= get_rtcl() - (unsigned int) tstamp
;
202 return delta
< 0 ? delta
+ 1000000000 : delta
;
204 return get_tbl() - tstamp
;
207 #define mulhwu(x,y) \
208 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
211 #define mulhdu(x,y) \
212 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
214 extern u64
mulhdu(u64
, u64
);
217 extern void smp_space_timers(unsigned int);
219 extern unsigned mulhwu_scale_factor(unsigned, unsigned);
220 extern void div128_by_32(u64 dividend_high
, u64 dividend_low
,
221 unsigned divisor
, struct div_result
*dr
);
223 /* Used to store Processor Utilization register (purr) values */
226 u64 current_tb
; /* Holds the current purr register values */
229 DECLARE_PER_CPU(struct cpu_usage
, cpu_usage_array
);
231 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
232 extern void account_process_vtime(struct task_struct
*tsk
);
234 #define account_process_vtime(tsk) do { } while (0)
237 #if defined(CONFIG_VIRT_CPU_ACCOUNTING) && defined(CONFIG_PPC_SPLPAR)
238 extern void calculate_steal_time(void);
239 extern void snapshot_timebases(void);
241 #define calculate_steal_time() do { } while (0)
242 #define snapshot_timebases() do { } while (0)
245 #endif /* __KERNEL__ */
246 #endif /* __POWERPC_TIME_H */
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