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 #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 generic_calibrate_decr(void);
31 extern void hdec_interrupt(struct pt_regs *regs);
33 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
34 extern unsigned long ppc_proc_freq;
35 #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8)
36 extern unsigned long ppc_tb_freq;
37 #define DEFAULT_TB_FREQ 125000000UL
44 /* Accessor functions for the timebase (RTC on 601) registers. */
45 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
46 #ifdef CONFIG_PPC_BOOK3S_32
47 #define __USE_RTC() (cpu_has_feature(CPU_FTR_USE_RTC))
54 /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */
55 #define get_tbl get_tb
59 static inline unsigned long get_tbl(void)
61 #if defined(CONFIG_403GCX)
63 asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
70 static inline unsigned int get_tbu(void)
74 asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
80 #endif /* !CONFIG_PPC64 */
82 static inline unsigned int get_rtcl(void)
86 asm volatile("mfrtcl %0" : "=r" (rtcl));
90 static inline u64 get_rtc(void)
92 unsigned int hi, lo, hi2;
95 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
96 : "=r" (hi), "=r" (lo), "=r" (hi2));
98 return (u64)hi * 1000000000 + lo;
101 static inline u64 get_vtb(void)
103 #ifdef CONFIG_PPC_BOOK3S_64
104 if (cpu_has_feature(CPU_FTR_ARCH_207S))
105 return mfspr(SPRN_VTB);
111 static inline u64 get_tb(void)
115 #else /* CONFIG_PPC64 */
116 static inline u64 get_tb(void)
118 unsigned int tbhi, tblo, tbhi2;
124 } while (tbhi != tbhi2);
126 return ((u64)tbhi << 32) | tblo;
128 #endif /* !CONFIG_PPC64 */
130 static inline u64 get_tb_or_rtc(void)
132 return __USE_RTC() ? get_rtc() : get_tb();
135 static inline void set_tb(unsigned int upper, unsigned int lower)
138 mtspr(SPRN_TBWU, upper);
139 mtspr(SPRN_TBWL, lower);
142 /* Accessor functions for the decrementer register.
143 * The 4xx doesn't even have a decrementer. I tried to use the
144 * generic timer interrupt code, which seems OK, with the 4xx PIT
145 * in auto-reload mode. The problem is PIT stops counting when it
146 * hits zero. If it would wrap, we could use it just like a decrementer.
148 static inline u64 get_dec(void)
150 #if defined(CONFIG_40x)
151 return (mfspr(SPRN_PIT));
153 return (mfspr(SPRN_DEC));
158 * Note: Book E and 4xx processors differ from other PowerPC processors
159 * in when the decrementer generates its interrupt: on the 1 to 0
160 * transition for Book E/4xx, but on the 0 to -1 transition for others.
162 static inline void set_dec(u64 val)
164 #if defined(CONFIG_40x)
165 mtspr(SPRN_PIT, (u32) val);
170 mtspr(SPRN_DEC, val);
174 static inline unsigned long tb_ticks_since(unsigned long tstamp)
177 int delta = get_rtcl() - (unsigned int) tstamp;
178 return delta < 0 ? delta + 1000000000 : delta;
180 return get_tbl() - tstamp;
183 #define mulhwu(x,y) \
184 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
187 #define mulhdu(x,y) \
188 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
190 extern u64 mulhdu(u64, u64);
193 extern void div128_by_32(u64 dividend_high, u64 dividend_low,
194 unsigned divisor, struct div_result *dr);
196 extern void secondary_cpu_time_init(void);
197 extern void __init time_init(void);
199 DECLARE_PER_CPU(u64, decrementers_next_tb);
201 /* Convert timebase ticks to nanoseconds */
202 unsigned long long tb_to_ns(unsigned long long tb_ticks);
204 #endif /* __KERNEL__ */
205 #endif /* __POWERPC_TIME_H */