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 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
43 extern unsigned long ppc_proc_freq;
44 #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8)
45 extern unsigned long ppc_tb_freq;
46 #define DEFAULT_TB_FREQ 125000000UL
49 * By putting all of this stuff into a single struct we
50 * reduce the number of cache lines touched by do_gettimeofday.
51 * Both by collecting all of the data in one cache line and
52 * by touching only one TOC entry on ppc64.
54 struct gettimeofday_vars {
60 struct gettimeofday_struct {
61 unsigned long tb_ticks_per_sec;
62 struct gettimeofday_vars vars[2];
63 struct gettimeofday_vars * volatile varp;
73 /* Accessor functions for the timebase (RTC on 601) registers. */
74 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
76 #define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB))
81 /* On ppc64 this gets us the whole timebase; on ppc32 just the lower half */
82 static inline unsigned long get_tbl(void)
86 #if defined(CONFIG_403GCX)
87 asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
89 asm volatile("mftb %0" : "=r" (tbl));
94 static inline unsigned int get_tbu(void)
98 #if defined(CONFIG_403GCX)
99 asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
101 asm volatile("mftbu %0" : "=r" (tbu));
106 static inline unsigned int get_rtcl(void)
110 asm volatile("mfrtcl %0" : "=r" (rtcl));
114 static inline u64 get_rtc(void)
116 unsigned int hi, lo, hi2;
119 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
120 : "=r" (hi), "=r" (lo), "=r" (hi2));
122 return (u64)hi * 1000000000 + lo;
126 static inline u64 get_tb(void)
131 static inline u64 get_tb(void)
133 unsigned int tbhi, tblo, tbhi2;
139 } while (tbhi != tbhi2);
141 return ((u64)tbhi << 32) | tblo;
145 static inline void set_tb(unsigned int upper, unsigned int lower)
148 mtspr(SPRN_TBWU, upper);
149 mtspr(SPRN_TBWL, lower);
152 /* Accessor functions for the decrementer register.
153 * The 4xx doesn't even have a decrementer. I tried to use the
154 * generic timer interrupt code, which seems OK, with the 4xx PIT
155 * in auto-reload mode. The problem is PIT stops counting when it
156 * hits zero. If it would wrap, we could use it just like a decrementer.
158 static inline unsigned int get_dec(void)
160 #if defined(CONFIG_40x)
161 return (mfspr(SPRN_PIT));
163 return (mfspr(SPRN_DEC));
167 static inline void set_dec(int val)
169 #if defined(CONFIG_40x)
170 return; /* Have to let it auto-reload */
171 #elif defined(CONFIG_8xx_CPU6)
174 #ifdef CONFIG_PPC_ISERIES
177 if (firmware_has_feature(FW_FEATURE_ISERIES) &&
178 get_lppaca()->shared_proc) {
179 get_lppaca()->virtual_decr = val;
182 HvCall_setVirtualDecr();
185 mtspr(SPRN_DEC, val);
186 #endif /* not 40x or 8xx_CPU6 */
189 static inline unsigned long tb_ticks_since(unsigned long tstamp)
192 int delta = get_rtcl() - (unsigned int) tstamp;
193 return delta < 0 ? delta + 1000000000 : delta;
195 return get_tbl() - tstamp;
198 #define mulhwu(x,y) \
199 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
202 #define mulhdu(x,y) \
203 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
205 extern u64 mulhdu(u64, u64);
208 extern void smp_space_timers(unsigned int);
210 extern unsigned mulhwu_scale_factor(unsigned, unsigned);
211 extern void div128_by_32(u64 dividend_high, u64 dividend_low,
212 unsigned divisor, struct div_result *dr);
214 /* Used to store Processor Utilization register (purr) values */
217 u64 current_tb; /* Holds the current purr register values */
220 DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
222 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
223 extern void account_process_vtime(struct task_struct *tsk);
225 #define account_process_vtime(tsk) do { } while (0)
228 #if defined(CONFIG_VIRT_CPU_ACCOUNTING) && defined(CONFIG_PPC_SPLPAR)
229 extern void calculate_steal_time(void);
230 extern void snapshot_timebases(void);
232 #define calculate_steal_time() do { } while (0)
233 #define snapshot_timebases() do { } while (0)
236 #endif /* __KERNEL__ */
237 #endif /* __PPC64_TIME_H */