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>
23 extern unsigned long tb_ticks_per_jiffy;
24 extern unsigned long tb_ticks_per_usec;
25 extern unsigned long tb_ticks_per_sec;
26 extern struct clock_event_device decrementer_clockevent;
29 extern void to_tm(int tim, struct rtc_time * tm);
30 extern void tick_broadcast_ipi_handler(void);
32 extern void generic_calibrate_decr(void);
34 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
35 extern unsigned long ppc_proc_freq;
36 #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8)
37 extern unsigned long ppc_tb_freq;
38 #define DEFAULT_TB_FREQ 125000000UL
45 /* Accessor functions for the timebase (RTC on 601) registers. */
46 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
48 #define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB))
55 /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */
56 #define get_tbl get_tb
60 static inline unsigned long get_tbl(void)
62 #if defined(CONFIG_403GCX)
64 asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
71 static inline unsigned int get_tbu(void)
75 asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
81 #endif /* !CONFIG_PPC64 */
83 static inline unsigned int get_rtcl(void)
87 asm volatile("mfrtcl %0" : "=r" (rtcl));
91 static inline u64 get_rtc(void)
93 unsigned int hi, lo, hi2;
96 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
97 : "=r" (hi), "=r" (lo), "=r" (hi2));
99 return (u64)hi * 1000000000 + lo;
102 static inline u64 get_vtb(void)
104 #ifdef CONFIG_PPC_BOOK3S_64
105 if (cpu_has_feature(CPU_FTR_ARCH_207S))
112 static inline u64 get_tb(void)
116 #else /* CONFIG_PPC64 */
117 static inline u64 get_tb(void)
119 unsigned int tbhi, tblo, tbhi2;
125 } while (tbhi != tbhi2);
127 return ((u64)tbhi << 32) | tblo;
129 #endif /* !CONFIG_PPC64 */
131 static inline u64 get_tb_or_rtc(void)
133 return __USE_RTC() ? get_rtc() : get_tb();
136 static inline void set_tb(unsigned int upper, unsigned int lower)
139 mtspr(SPRN_TBWU, upper);
140 mtspr(SPRN_TBWL, lower);
143 /* Accessor functions for the decrementer register.
144 * The 4xx doesn't even have a decrementer. I tried to use the
145 * generic timer interrupt code, which seems OK, with the 4xx PIT
146 * in auto-reload mode. The problem is PIT stops counting when it
147 * hits zero. If it would wrap, we could use it just like a decrementer.
149 static inline u64 get_dec(void)
151 #if defined(CONFIG_40x)
152 return (mfspr(SPRN_PIT));
154 return (mfspr(SPRN_DEC));
159 * Note: Book E and 4xx processors differ from other PowerPC processors
160 * in when the decrementer generates its interrupt: on the 1 to 0
161 * transition for Book E/4xx, but on the 0 to -1 transition for others.
163 static inline void set_dec(u64 val)
165 #if defined(CONFIG_40x)
166 mtspr(SPRN_PIT, (u32) val);
171 mtspr(SPRN_DEC, val);
175 static inline unsigned long tb_ticks_since(unsigned long tstamp)
178 int delta = get_rtcl() - (unsigned int) tstamp;
179 return delta < 0 ? delta + 1000000000 : delta;
181 return get_tbl() - tstamp;
184 #define mulhwu(x,y) \
185 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
188 #define mulhdu(x,y) \
189 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
191 extern u64 mulhdu(u64, u64);
194 extern void div128_by_32(u64 dividend_high, u64 dividend_low,
195 unsigned divisor, struct div_result *dr);
197 /* Used to store Processor Utilization register (purr) values */
200 u64 current_tb; /* Holds the current purr register values */
203 DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
205 extern void secondary_cpu_time_init(void);
207 DECLARE_PER_CPU(u64, decrementers_next_tb);
209 /* Convert timebase ticks to nanoseconds */
210 unsigned long long tb_to_ns(unsigned long long tb_ticks);
212 #endif /* __KERNEL__ */
213 #endif /* __POWERPC_TIME_H */