arch/powerpc/include/asm/time.h

   1 /*
   2  * Common time prototypes and such for all ppc machines.
   3  *
   4  * Written by Cort Dougan (cort@cs.nmt.edu) to merge
   5  * Paul Mackerras' version and mine for PReP and Pmac.
   6  *
   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.
  11  */
  12
  13 #ifndef __POWERPC_TIME_H
  14 #define __POWERPC_TIME_H
  15
  16 #ifdef __KERNEL__
  17 #include <linux/types.h>
  18 #include <linux/percpu.h>
  19
  20 #include <asm/processor.h>
  21
  22 /* time.c */
  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;
  27
  28 struct rtc_time;
  29 extern void to_tm(int tim, struct rtc_time * tm);
  30 extern void tick_broadcast_ipi_handler(void);
  31
  32 extern void generic_calibrate_decr(void);
  33
  34 extern void set_dec_cpu6(unsigned int val);
  35
  36 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
  37 extern unsigned long ppc_proc_freq;
  38 #define DEFAULT_PROC_FREQ       (DEFAULT_TB_FREQ * 8)
  39 extern unsigned long ppc_tb_freq;
  40 #define DEFAULT_TB_FREQ         125000000UL
  41
  42 struct div_result {
  43         u64 result_high;
  44         u64 result_low;
  45 };
  46
  47 /* Accessor functions for the timebase (RTC on 601) registers. */
  48 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
  49 #ifdef CONFIG_6xx
  50 #define __USE_RTC()     (!cpu_has_feature(CPU_FTR_USE_TB))
  51 #else
  52 #define __USE_RTC()     0
  53 #endif
  54
  55 #ifdef CONFIG_PPC64
  56
  57 /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */
  58 #define get_tbl         get_tb
  59
  60 #else
  61
  62 static inline unsigned long get_tbl(void)
  63 {
  64 #if defined(CONFIG_403GCX)
  65         unsigned long tbl;
  66         asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
  67         return tbl;
  68 #else
  69         return mftbl();
  70 #endif
  71 }
  72
  73 static inline unsigned int get_tbu(void)
  74 {
  75 #ifdef CONFIG_403GCX
  76         unsigned int tbu;
  77         asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
  78         return tbu;
  79 #else
  80         return mftbu();
  81 #endif
  82 }
  83 #endif /* !CONFIG_PPC64 */
  84
  85 static inline unsigned int get_rtcl(void)
  86 {
  87         unsigned int rtcl;
  88
  89         asm volatile("mfrtcl %0" : "=r" (rtcl));
  90         return rtcl;
  91 }
  92
  93 static inline u64 get_rtc(void)
  94 {
  95         unsigned int hi, lo, hi2;
  96
  97         do {
  98                 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
  99                              : "=r" (hi), "=r" (lo), "=r" (hi2));
 100         } while (hi2 != hi);
 101         return (u64)hi * 1000000000 + lo;
 102 }
 103
 104 static inline u64 get_vtb(void)
 105 {
 106 #ifdef CONFIG_PPC_BOOK3S_64
 107         if (cpu_has_feature(CPU_FTR_ARCH_207S))
 108                 return mfvtb();
 109 #endif
 110         return 0;
 111 }
 112
 113 #ifdef CONFIG_PPC64
 114 static inline u64 get_tb(void)
 115 {
 116         return mftb();
 117 }
 118 #else /* CONFIG_PPC64 */
 119 static inline u64 get_tb(void)
 120 {
 121         unsigned int tbhi, tblo, tbhi2;
 122
 123         do {
 124                 tbhi = get_tbu();
 125                 tblo = get_tbl();
 126                 tbhi2 = get_tbu();
 127         } while (tbhi != tbhi2);
 128
 129         return ((u64)tbhi << 32) | tblo;
 130 }
 131 #endif /* !CONFIG_PPC64 */
 132
 133 static inline u64 get_tb_or_rtc(void)
 134 {
 135         return __USE_RTC() ? get_rtc() : get_tb();
 136 }
 137
 138 static inline void set_tb(unsigned int upper, unsigned int lower)
 139 {
 140         mtspr(SPRN_TBWL, 0);
 141         mtspr(SPRN_TBWU, upper);
 142         mtspr(SPRN_TBWL, lower);
 143 }
 144
 145 /* Accessor functions for the decrementer register.
 146  * The 4xx doesn't even have a decrementer.  I tried to use the
 147  * generic timer interrupt code, which seems OK, with the 4xx PIT
 148  * in auto-reload mode.  The problem is PIT stops counting when it
 149  * hits zero.  If it would wrap, we could use it just like a decrementer.
 150  */
 151 static inline unsigned int get_dec(void)
 152 {
 153 #if defined(CONFIG_40x)
 154         return (mfspr(SPRN_PIT));
 155 #else
 156         return (mfspr(SPRN_DEC));
 157 #endif
 158 }
 159
 160 /*
 161  * Note: Book E and 4xx processors differ from other PowerPC processors
 162  * in when the decrementer generates its interrupt: on the 1 to 0
 163  * transition for Book E/4xx, but on the 0 to -1 transition for others.
 164  */
 165 static inline void set_dec(int val)
 166 {
 167 #if defined(CONFIG_40x)
 168         mtspr(SPRN_PIT, val);
 169 #elif defined(CONFIG_8xx_CPU6)
 170         set_dec_cpu6(val - 1);
 171 #else
 172 #ifndef CONFIG_BOOKE
 173         --val;
 174 #endif
 175         mtspr(SPRN_DEC, val);
 176 #endif /* not 40x or 8xx_CPU6 */
 177 }
 178
 179 static inline unsigned long tb_ticks_since(unsigned long tstamp)
 180 {
 181         if (__USE_RTC()) {
 182                 int delta = get_rtcl() - (unsigned int) tstamp;
 183                 return delta < 0 ? delta + 1000000000 : delta;
 184         }
 185         return get_tbl() - tstamp;
 186 }
 187
 188 #define mulhwu(x,y) \
 189 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
 190
 191 #ifdef CONFIG_PPC64
 192 #define mulhdu(x,y) \
 193 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
 194 #else
 195 extern u64 mulhdu(u64, u64);
 196 #endif
 197
 198 extern void div128_by_32(u64 dividend_high, u64 dividend_low,
 199                          unsigned divisor, struct div_result *dr);
 200
 201 /* Used to store Processor Utilization register (purr) values */
 202
 203 struct cpu_usage {
 204         u64 current_tb;  /* Holds the current purr register values */
 205 };
 206
 207 DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
 208
 209 extern void secondary_cpu_time_init(void);
 210
 211 DECLARE_PER_CPU(u64, decrementers_next_tb);
 212
 213 /* Convert timebase ticks to nanoseconds */
 214 unsigned long long tb_to_ns(unsigned long long tb_ticks);
 215
 216 #endif /* __KERNEL__ */
 217 #endif /* __POWERPC_TIME_H */