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 GregorianDay(struct rtc_time *tm);
31 extern void tick_broadcast_ipi_handler(void);
33 extern void generic_calibrate_decr(void);
35 extern void set_dec_cpu6(unsigned int val);
37 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
38 extern unsigned long ppc_proc_freq;
39 #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8)
40 extern unsigned long ppc_tb_freq;
41 #define DEFAULT_TB_FREQ 125000000UL
48 /* Accessor functions for the timebase (RTC on 601) registers. */
49 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
51 #define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB))
58 /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */
59 #define get_tbl get_tb
63 static inline unsigned long get_tbl(void)
65 #if defined(CONFIG_403GCX)
67 asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
74 static inline unsigned int get_tbu(void)
78 asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
84 #endif /* !CONFIG_PPC64 */
86 static inline unsigned int get_rtcl(void)
90 asm volatile("mfrtcl %0" : "=r" (rtcl));
94 static inline u64 get_rtc(void)
96 unsigned int hi, lo, hi2;
99 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
100 : "=r" (hi), "=r" (lo), "=r" (hi2));
102 return (u64)hi * 1000000000 + lo;
106 static inline u64 get_tb(void)
110 #else /* CONFIG_PPC64 */
111 static inline u64 get_tb(void)
113 unsigned int tbhi, tblo, tbhi2;
119 } while (tbhi != tbhi2);
121 return ((u64)tbhi << 32) | tblo;
123 #endif /* !CONFIG_PPC64 */
125 static inline u64 get_tb_or_rtc(void)
127 return __USE_RTC() ? get_rtc() : get_tb();
130 static inline void set_tb(unsigned int upper, unsigned int lower)
133 mtspr(SPRN_TBWU, upper);
134 mtspr(SPRN_TBWL, lower);
137 /* Accessor functions for the decrementer register.
138 * The 4xx doesn't even have a decrementer. I tried to use the
139 * generic timer interrupt code, which seems OK, with the 4xx PIT
140 * in auto-reload mode. The problem is PIT stops counting when it
141 * hits zero. If it would wrap, we could use it just like a decrementer.
143 static inline unsigned int get_dec(void)
145 #if defined(CONFIG_40x)
146 return (mfspr(SPRN_PIT));
148 return (mfspr(SPRN_DEC));
153 * Note: Book E and 4xx processors differ from other PowerPC processors
154 * in when the decrementer generates its interrupt: on the 1 to 0
155 * transition for Book E/4xx, but on the 0 to -1 transition for others.
157 static inline void set_dec(int val)
159 #if defined(CONFIG_40x)
160 mtspr(SPRN_PIT, val);
161 #elif defined(CONFIG_8xx_CPU6)
162 set_dec_cpu6(val - 1);
167 mtspr(SPRN_DEC, val);
168 #endif /* not 40x or 8xx_CPU6 */
171 static inline unsigned long tb_ticks_since(unsigned long tstamp)
174 int delta = get_rtcl() - (unsigned int) tstamp;
175 return delta < 0 ? delta + 1000000000 : delta;
177 return get_tbl() - tstamp;
180 #define mulhwu(x,y) \
181 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
184 #define mulhdu(x,y) \
185 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
187 extern u64 mulhdu(u64, u64);
190 extern void div128_by_32(u64 dividend_high, u64 dividend_low,
191 unsigned divisor, struct div_result *dr);
193 /* Used to store Processor Utilization register (purr) values */
196 u64 current_tb; /* Holds the current purr register values */
199 DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
201 extern void secondary_cpu_time_init(void);
203 DECLARE_PER_CPU(u64, decrementers_next_tb);
205 #endif /* __KERNEL__ */
206 #endif /* __POWERPC_TIME_H */