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 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
  35 extern unsigned long ppc_proc_freq;
  36 #define DEFAULT_PROC_FREQ       (DEFAULT_TB_FREQ * 8)
  37 extern unsigned long ppc_tb_freq;
  38 #define DEFAULT_TB_FREQ         125000000UL
  39
  40 struct div_result {
  41         u64 result_high;
  42         u64 result_low;
  43 };
  44
  45 /* Accessor functions for the timebase (RTC on 601) registers. */
  46 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
  47 #ifdef CONFIG_6xx
  48 #define __USE_RTC()     (!cpu_has_feature(CPU_FTR_USE_TB))
  49 #else
  50 #define __USE_RTC()     0
  51 #endif
  52
  53 #ifdef CONFIG_PPC64
  54
  55 /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */
  56 #define get_tbl         get_tb
  57
  58 #else
  59
  60 static inline unsigned long get_tbl(void)
  61 {
  62 #if defined(CONFIG_403GCX)
  63         unsigned long tbl;
  64         asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
  65         return tbl;
  66 #else
  67         return mftbl();
  68 #endif
  69 }
  70
  71 static inline unsigned int get_tbu(void)
  72 {
  73 #ifdef CONFIG_403GCX
  74         unsigned int tbu;
  75         asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
  76         return tbu;
  77 #else
  78         return mftbu();
  79 #endif
  80 }
  81 #endif /* !CONFIG_PPC64 */
  82
  83 static inline unsigned int get_rtcl(void)
  84 {
  85         unsigned int rtcl;
  86
  87         asm volatile("mfrtcl %0" : "=r" (rtcl));
  88         return rtcl;
  89 }
  90
  91 static inline u64 get_rtc(void)
  92 {
  93         unsigned int hi, lo, hi2;
  94
  95         do {
  96                 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
  97                              : "=r" (hi), "=r" (lo), "=r" (hi2));
  98         } while (hi2 != hi);
  99         return (u64)hi * 1000000000 + lo;
 100 }
 101
 102 static inline u64 get_vtb(void)
 103 {
 104 #ifdef CONFIG_PPC_BOOK3S_64
 105         if (cpu_has_feature(CPU_FTR_ARCH_207S))
 106                 return mfvtb();
 107 #endif
 108         return 0;
 109 }
 110
 111 #ifdef CONFIG_PPC64
 112 static inline u64 get_tb(void)
 113 {
 114         return mftb();
 115 }
 116 #else /* CONFIG_PPC64 */
 117 static inline u64 get_tb(void)
 118 {
 119         unsigned int tbhi, tblo, tbhi2;
 120
 121         do {
 122                 tbhi = get_tbu();
 123                 tblo = get_tbl();
 124                 tbhi2 = get_tbu();
 125         } while (tbhi != tbhi2);
 126
 127         return ((u64)tbhi << 32) | tblo;
 128 }
 129 #endif /* !CONFIG_PPC64 */
 130
 131 static inline u64 get_tb_or_rtc(void)
 132 {
 133         return __USE_RTC() ? get_rtc() : get_tb();
 134 }
 135
 136 static inline void set_tb(unsigned int upper, unsigned int lower)
 137 {
 138         mtspr(SPRN_TBWL, 0);
 139         mtspr(SPRN_TBWU, upper);
 140         mtspr(SPRN_TBWL, lower);
 141 }
 142
 143 /* Accessor functions for the decrementer register.
 144  * The 4xx doesn't even have a decrementer.  I tried to use the
 145  * generic timer interrupt code, which seems OK, with the 4xx PIT
 146  * in auto-reload mode.  The problem is PIT stops counting when it
 147  * hits zero.  If it would wrap, we could use it just like a decrementer.
 148  */
 149 static inline u64 get_dec(void)
 150 {
 151 #if defined(CONFIG_40x)
 152         return (mfspr(SPRN_PIT));
 153 #else
 154         return (mfspr(SPRN_DEC));
 155 #endif
 156 }
 157
 158 /*
 159  * Note: Book E and 4xx processors differ from other PowerPC processors
 160  * in when the decrementer generates its interrupt: on the 1 to 0
 161  * transition for Book E/4xx, but on the 0 to -1 transition for others.
 162  */
 163 static inline void set_dec(u64 val)
 164 {
 165 #if defined(CONFIG_40x)
 166         mtspr(SPRN_PIT, (u32) val);
 167 #else
 168 #ifndef CONFIG_BOOKE
 169         --val;
 170 #endif
 171         mtspr(SPRN_DEC, val);
 172 #endif /* not 40x */
 173 }
 174
 175 static inline unsigned long tb_ticks_since(unsigned long tstamp)
 176 {
 177         if (__USE_RTC()) {
 178                 int delta = get_rtcl() - (unsigned int) tstamp;
 179                 return delta < 0 ? delta + 1000000000 : delta;
 180         }
 181         return get_tbl() - tstamp;
 182 }
 183
 184 #define mulhwu(x,y) \
 185 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
 186
 187 #ifdef CONFIG_PPC64
 188 #define mulhdu(x,y) \
 189 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
 190 #else
 191 extern u64 mulhdu(u64, u64);
 192 #endif
 193
 194 extern void div128_by_32(u64 dividend_high, u64 dividend_low,
 195                          unsigned divisor, struct div_result *dr);
 196
 197 /* Used to store Processor Utilization register (purr) values */
 198
 199 struct cpu_usage {
 200         u64 current_tb;  /* Holds the current purr register values */
 201 };
 202
 203 DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
 204
 205 extern void secondary_cpu_time_init(void);
 206
 207 DECLARE_PER_CPU(u64, decrementers_next_tb);
 208
 209 /* Convert timebase ticks to nanoseconds */
 210 unsigned long long tb_to_ns(unsigned long long tb_ticks);
 211
 212 #endif /* __KERNEL__ */
 213 #endif /* __POWERPC_TIME_H */