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;
28 extern void to_tm(int tim, struct rtc_time * tm);
29 extern void GregorianDay(struct rtc_time *tm);
31 extern void generic_calibrate_decr(void);
33 extern void set_dec_cpu6(unsigned int val);
35 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
36 extern unsigned long ppc_proc_freq;
37 #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8)
38 extern unsigned long ppc_tb_freq;
39 #define DEFAULT_TB_FREQ 125000000UL
46 /* Accessor functions for the timebase (RTC on 601) registers. */
47 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
49 #define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB))
56 /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */
57 #define get_tbl get_tb
61 static inline unsigned long get_tbl(void)
63 #if defined(CONFIG_403GCX)
65 asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
72 static inline unsigned int get_tbu(void)
76 asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
82 #endif /* !CONFIG_PPC64 */
84 static inline unsigned int get_rtcl(void)
88 asm volatile("mfrtcl %0" : "=r" (rtcl));
92 static inline u64 get_rtc(void)
94 unsigned int hi, lo, hi2;
97 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
98 : "=r" (hi), "=r" (lo), "=r" (hi2));
100 return (u64)hi * 1000000000 + lo;
104 static inline u64 get_tb(void)
108 #else /* CONFIG_PPC64 */
109 static inline u64 get_tb(void)
111 unsigned int tbhi, tblo, tbhi2;
117 } while (tbhi != tbhi2);
119 return ((u64)tbhi << 32) | tblo;
121 #endif /* !CONFIG_PPC64 */
123 static inline u64 get_tb_or_rtc(void)
125 return __USE_RTC() ? get_rtc() : get_tb();
128 static inline void set_tb(unsigned int upper, unsigned int lower)
131 mtspr(SPRN_TBWU, upper);
132 mtspr(SPRN_TBWL, lower);
135 /* Accessor functions for the decrementer register.
136 * The 4xx doesn't even have a decrementer. I tried to use the
137 * generic timer interrupt code, which seems OK, with the 4xx PIT
138 * in auto-reload mode. The problem is PIT stops counting when it
139 * hits zero. If it would wrap, we could use it just like a decrementer.
141 static inline unsigned int get_dec(void)
143 #if defined(CONFIG_40x)
144 return (mfspr(SPRN_PIT));
146 return (mfspr(SPRN_DEC));
151 * Note: Book E and 4xx processors differ from other PowerPC processors
152 * in when the decrementer generates its interrupt: on the 1 to 0
153 * transition for Book E/4xx, but on the 0 to -1 transition for others.
155 static inline void set_dec(int val)
157 #if defined(CONFIG_40x)
158 mtspr(SPRN_PIT, val);
159 #elif defined(CONFIG_8xx_CPU6)
160 set_dec_cpu6(val - 1);
165 mtspr(SPRN_DEC, val);
166 #endif /* not 40x or 8xx_CPU6 */
169 static inline unsigned long tb_ticks_since(unsigned long tstamp)
172 int delta = get_rtcl() - (unsigned int) tstamp;
173 return delta < 0 ? delta + 1000000000 : delta;
175 return get_tbl() - tstamp;
178 #define mulhwu(x,y) \
179 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
182 #define mulhdu(x,y) \
183 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
185 extern u64 mulhdu(u64, u64);
188 extern void div128_by_32(u64 dividend_high, u64 dividend_low,
189 unsigned divisor, struct div_result *dr);
191 /* Used to store Processor Utilization register (purr) values */
194 u64 current_tb; /* Holds the current purr register values */
197 DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
199 #if defined(CONFIG_VIRT_CPU_ACCOUNTING)
200 #define account_process_vtime(tsk) account_process_tick(tsk, 0)
202 #define account_process_vtime(tsk) do { } while (0)
205 extern void secondary_cpu_time_init(void);
207 DECLARE_PER_CPU(u64, decrementers_next_tb);
209 #endif /* __KERNEL__ */
210 #endif /* __POWERPC_TIME_H */