include/asm-powerpc/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 #ifdef CONFIG_PPC_ISERIES
  22 #include <asm/paca.h>
  23 #include <asm/firmware.h>
  24 #include <asm/iseries/hv_call.h>
  25 #endif
  26
  27 /* time.c */
  28 extern unsigned long tb_ticks_per_jiffy;
  29 extern unsigned long tb_ticks_per_usec;
  30 extern unsigned long tb_ticks_per_sec;
  31 extern u64 tb_to_xs;
  32 extern unsigned      tb_to_us;
  33
  34 struct rtc_time;
  35 extern void to_tm(int tim, struct rtc_time * tm);
  36 extern time_t last_rtc_update;
  37
  38 extern void generic_calibrate_decr(void);
  39 extern void wakeup_decrementer(void);
  40 extern void snapshot_timebase(void);
  41
  42 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
  43 extern unsigned long ppc_proc_freq;
  44 #define DEFAULT_PROC_FREQ       (DEFAULT_TB_FREQ * 8)
  45 extern unsigned long ppc_tb_freq;
  46 #define DEFAULT_TB_FREQ         125000000UL
  47
  48 /*
  49  * By putting all of this stuff into a single struct we
  50  * reduce the number of cache lines touched by do_gettimeofday.
  51  * Both by collecting all of the data in one cache line and
  52  * by touching only one TOC entry on ppc64.
  53  */
  54 struct gettimeofday_vars {
  55         u64 tb_to_xs;
  56         u64 stamp_xsec;
  57         u64 tb_orig_stamp;
  58 };
  59
  60 struct gettimeofday_struct {
  61         unsigned long tb_ticks_per_sec;
  62         struct gettimeofday_vars vars[2];
  63         struct gettimeofday_vars * volatile varp;
  64         unsigned      var_idx;
  65         unsigned      tb_to_us;
  66 };
  67
  68 struct div_result {
  69         u64 result_high;
  70         u64 result_low;
  71 };
  72
  73 /* Accessor functions for the timebase (RTC on 601) registers. */
  74 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
  75 #ifdef CONFIG_6xx
  76 #define __USE_RTC()     (!cpu_has_feature(CPU_FTR_USE_TB))
  77 #else
  78 #define __USE_RTC()     0
  79 #endif
  80
  81 /* On ppc64 this gets us the whole timebase; on ppc32 just the lower half */
  82 static inline unsigned long get_tbl(void)
  83 {
  84         unsigned long tbl;
  85
  86 #if defined(CONFIG_403GCX)
  87         asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
  88 #else
  89         asm volatile("mftb %0" : "=r" (tbl));
  90 #endif
  91         return tbl;
  92 }
  93
  94 static inline unsigned int get_tbu(void)
  95 {
  96         unsigned int tbu;
  97
  98 #if defined(CONFIG_403GCX)
  99         asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
 100 #else
 101         asm volatile("mftbu %0" : "=r" (tbu));
 102 #endif
 103         return tbu;
 104 }
 105
 106 static inline unsigned int get_rtcl(void)
 107 {
 108         unsigned int rtcl;
 109
 110         asm volatile("mfrtcl %0" : "=r" (rtcl));
 111         return rtcl;
 112 }
 113
 114 static inline u64 get_rtc(void)
 115 {
 116         unsigned int hi, lo, hi2;
 117
 118         do {
 119                 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
 120                              : "=r" (hi), "=r" (lo), "=r" (hi2));
 121         } while (hi2 != hi);
 122         return (u64)hi * 1000000000 + lo;
 123 }
 124
 125 #ifdef CONFIG_PPC64
 126 static inline u64 get_tb(void)
 127 {
 128         return mftb();
 129 }
 130 #else
 131 static inline u64 get_tb(void)
 132 {
 133         unsigned int tbhi, tblo, tbhi2;
 134
 135         do {
 136                 tbhi = get_tbu();
 137                 tblo = get_tbl();
 138                 tbhi2 = get_tbu();
 139         } while (tbhi != tbhi2);
 140
 141         return ((u64)tbhi << 32) | tblo;
 142 }
 143 #endif
 144
 145 static inline void set_tb(unsigned int upper, unsigned int lower)
 146 {
 147         mtspr(SPRN_TBWL, 0);
 148         mtspr(SPRN_TBWU, upper);
 149         mtspr(SPRN_TBWL, lower);
 150 }
 151
 152 /* Accessor functions for the decrementer register.
 153  * The 4xx doesn't even have a decrementer.  I tried to use the
 154  * generic timer interrupt code, which seems OK, with the 4xx PIT
 155  * in auto-reload mode.  The problem is PIT stops counting when it
 156  * hits zero.  If it would wrap, we could use it just like a decrementer.
 157  */
 158 static inline unsigned int get_dec(void)
 159 {
 160 #if defined(CONFIG_40x)
 161         return (mfspr(SPRN_PIT));
 162 #else
 163         return (mfspr(SPRN_DEC));
 164 #endif
 165 }
 166
 167 static inline void set_dec(int val)
 168 {
 169 #if defined(CONFIG_40x)
 170         return;         /* Have to let it auto-reload */
 171 #elif defined(CONFIG_8xx_CPU6)
 172         set_dec_cpu6(val);
 173 #else
 174 #ifdef CONFIG_PPC_ISERIES
 175         int cur_dec;
 176
 177         if (firmware_has_feature(FW_FEATURE_ISERIES) &&
 178                         get_lppaca()->shared_proc) {
 179                 get_lppaca()->virtual_decr = val;
 180                 cur_dec = get_dec();
 181                 if (cur_dec > val)
 182                         HvCall_setVirtualDecr();
 183         } else
 184 #endif
 185                 mtspr(SPRN_DEC, val);
 186 #endif /* not 40x or 8xx_CPU6 */
 187 }
 188
 189 static inline unsigned long tb_ticks_since(unsigned long tstamp)
 190 {
 191         if (__USE_RTC()) {
 192                 int delta = get_rtcl() - (unsigned int) tstamp;
 193                 return delta < 0 ? delta + 1000000000 : delta;
 194         }
 195         return get_tbl() - tstamp;
 196 }
 197
 198 #define mulhwu(x,y) \
 199 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
 200
 201 #ifdef CONFIG_PPC64
 202 #define mulhdu(x,y) \
 203 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
 204 #else
 205 extern u64 mulhdu(u64, u64);
 206 #endif
 207
 208 extern void smp_space_timers(unsigned int);
 209
 210 extern unsigned mulhwu_scale_factor(unsigned, unsigned);
 211 extern void div128_by_32(u64 dividend_high, u64 dividend_low,
 212                          unsigned divisor, struct div_result *dr);
 213
 214 /* Used to store Processor Utilization register (purr) values */
 215
 216 struct cpu_usage {
 217         u64 current_tb;  /* Holds the current purr register values */
 218 };
 219
 220 DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
 221
 222 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
 223 extern void account_process_vtime(struct task_struct *tsk);
 224 #else
 225 #define account_process_vtime(tsk)              do { } while (0)
 226 #endif
 227
 228 #if defined(CONFIG_VIRT_CPU_ACCOUNTING) && defined(CONFIG_PPC_SPLPAR)
 229 extern void calculate_steal_time(void);
 230 extern void snapshot_timebases(void);
 231 #else
 232 #define calculate_steal_time()                  do { } while (0)
 233 #define snapshot_timebases()                    do { } while (0)
 234 #endif
 235
 236 #endif /* __KERNEL__ */
 237 #endif /* __PPC64_TIME_H */