2 * Common time prototypes and such for all ppc machines.
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 #include <asm/cpu_has_feature.h>
24 extern unsigned long tb_ticks_per_jiffy;
25 extern unsigned long tb_ticks_per_usec;
26 extern unsigned long tb_ticks_per_sec;
27 extern struct clock_event_device decrementer_clockevent;
30 extern void to_tm(int tim, struct rtc_time * tm);
31 extern void tick_broadcast_ipi_handler(void);
33 extern void generic_calibrate_decr(void);
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;
103 static inline u64 get_vtb(void)
105 #ifdef CONFIG_PPC_BOOK3S_64
106 if (cpu_has_feature(CPU_FTR_ARCH_207S))
107 return mfspr(SPRN_VTB);
113 static inline u64 get_tb(void)
117 #else /* CONFIG_PPC64 */
118 static inline u64 get_tb(void)
120 unsigned int tbhi, tblo, tbhi2;
126 } while (tbhi != tbhi2);
128 return ((u64)tbhi << 32) | tblo;
130 #endif /* !CONFIG_PPC64 */
132 static inline u64 get_tb_or_rtc(void)
134 return __USE_RTC() ? get_rtc() : get_tb();
137 static inline void set_tb(unsigned int upper, unsigned int lower)
140 mtspr(SPRN_TBWU, upper);
141 mtspr(SPRN_TBWL, lower);
144 /* Accessor functions for the decrementer register.
145 * The 4xx doesn't even have a decrementer. I tried to use the
146 * generic timer interrupt code, which seems OK, with the 4xx PIT
147 * in auto-reload mode. The problem is PIT stops counting when it
148 * hits zero. If it would wrap, we could use it just like a decrementer.
150 static inline u64 get_dec(void)
152 #if defined(CONFIG_40x)
153 return (mfspr(SPRN_PIT));
155 return (mfspr(SPRN_DEC));
160 * Note: Book E and 4xx processors differ from other PowerPC processors
161 * in when the decrementer generates its interrupt: on the 1 to 0
162 * transition for Book E/4xx, but on the 0 to -1 transition for others.
164 static inline void set_dec(u64 val)
166 #if defined(CONFIG_40x)
167 mtspr(SPRN_PIT, (u32) val);
172 mtspr(SPRN_DEC, val);
176 static inline unsigned long tb_ticks_since(unsigned long tstamp)
179 int delta = get_rtcl() - (unsigned int) tstamp;
180 return delta < 0 ? delta + 1000000000 : delta;
182 return get_tbl() - tstamp;
185 #define mulhwu(x,y) \
186 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
189 #define mulhdu(x,y) \
190 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
192 extern u64 mulhdu(u64, u64);
195 extern void div128_by_32(u64 dividend_high, u64 dividend_low,
196 unsigned divisor, struct div_result *dr);
198 /* Used to store Processor Utilization register (purr) values */
201 u64 current_tb; /* Holds the current purr register values */
204 DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
206 extern void secondary_cpu_time_init(void);
208 DECLARE_PER_CPU(u64, decrementers_next_tb);
210 /* Convert timebase ticks to nanoseconds */
211 unsigned long long tb_to_ns(unsigned long long tb_ticks);
213 #endif /* __KERNEL__ */
214 #endif /* __POWERPC_TIME_H */