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 extern void set_dec_cpu6(unsigned int val);
  43
  44 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
  45 extern unsigned long ppc_proc_freq;
  46 #define DEFAULT_PROC_FREQ       (DEFAULT_TB_FREQ * 8)
  47 extern unsigned long ppc_tb_freq;
  48 #define DEFAULT_TB_FREQ         125000000UL
  49
  50 /*
  51  * By putting all of this stuff into a single struct we
  52  * reduce the number of cache lines touched by do_gettimeofday.
  53  * Both by collecting all of the data in one cache line and
  54  * by touching only one TOC entry on ppc64.
  55  */
  56 struct gettimeofday_vars {
  57         u64 tb_to_xs;
  58         u64 stamp_xsec;
  59         u64 tb_orig_stamp;
  60 };
  61
  62 struct gettimeofday_struct {
  63         unsigned long tb_ticks_per_sec;
  64         struct gettimeofday_vars vars[2];
  65         struct gettimeofday_vars * volatile varp;
  66         unsigned      var_idx;
  67         unsigned      tb_to_us;
  68 };
  69
  70 struct div_result {
  71         u64 result_high;
  72         u64 result_low;
  73 };
  74
  75 /* Accessor functions for the timebase (RTC on 601) registers. */
  76 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
  77 #ifdef CONFIG_6xx
  78 #define __USE_RTC()     (!cpu_has_feature(CPU_FTR_USE_TB))
  79 #else
  80 #define __USE_RTC()     0
  81 #endif
  82
  83 #ifdef CONFIG_PPC64
  84
  85 /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */
  86 #define get_tbl         get_tb
  87
  88 #else
  89
  90 static inline unsigned long get_tbl(void)
  91 {
  92 #if defined(CONFIG_403GCX)
  93         unsigned long tbl;
  94         asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
  95         return tbl;
  96 #else
  97         return mftbl();
  98 #endif
  99 }
 100
 101 static inline unsigned int get_tbu(void)
 102 {
 103 #ifdef CONFIG_403GCX
 104         unsigned int tbu;
 105         asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
 106         return tbu;
 107 #else
 108         return mftbu();
 109 #endif
 110 }
 111 #endif /* !CONFIG_PPC64 */
 112
 113 static inline unsigned int get_rtcl(void)
 114 {
 115         unsigned int rtcl;
 116
 117         asm volatile("mfrtcl %0" : "=r" (rtcl));
 118         return rtcl;
 119 }
 120
 121 static inline u64 get_rtc(void)
 122 {
 123         unsigned int hi, lo, hi2;
 124
 125         do {
 126                 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
 127                              : "=r" (hi), "=r" (lo), "=r" (hi2));
 128         } while (hi2 != hi);
 129         return (u64)hi * 1000000000 + lo;
 130 }
 131
 132 #ifdef CONFIG_PPC64
 133 static inline u64 get_tb(void)
 134 {
 135         return mftb();
 136 }
 137 #else /* CONFIG_PPC64 */
 138 static inline u64 get_tb(void)
 139 {
 140         unsigned int tbhi, tblo, tbhi2;
 141
 142         do {
 143                 tbhi = get_tbu();
 144                 tblo = get_tbl();
 145                 tbhi2 = get_tbu();
 146         } while (tbhi != tbhi2);
 147
 148         return ((u64)tbhi << 32) | tblo;
 149 }
 150 #endif /* !CONFIG_PPC64 */
 151
 152 static inline u64 get_tb_or_rtc(void)
 153 {
 154         return __USE_RTC() ? get_rtc() : get_tb();
 155 }
 156
 157 static inline void set_tb(unsigned int upper, unsigned int lower)
 158 {
 159         mtspr(SPRN_TBWL, 0);
 160         mtspr(SPRN_TBWU, upper);
 161         mtspr(SPRN_TBWL, lower);
 162 }
 163
 164 /* Accessor functions for the decrementer register.
 165  * The 4xx doesn't even have a decrementer.  I tried to use the
 166  * generic timer interrupt code, which seems OK, with the 4xx PIT
 167  * in auto-reload mode.  The problem is PIT stops counting when it
 168  * hits zero.  If it would wrap, we could use it just like a decrementer.
 169  */
 170 static inline unsigned int get_dec(void)
 171 {
 172 #if defined(CONFIG_40x)
 173         return (mfspr(SPRN_PIT));
 174 #else
 175         return (mfspr(SPRN_DEC));
 176 #endif
 177 }
 178
 179 /*
 180  * Note: Book E and 4xx processors differ from other PowerPC processors
 181  * in when the decrementer generates its interrupt: on the 1 to 0
 182  * transition for Book E/4xx, but on the 0 to -1 transition for others.
 183  */
 184 static inline void set_dec(int val)
 185 {
 186 #if defined(CONFIG_40x)
 187         mtspr(SPRN_PIT, val);
 188 #elif defined(CONFIG_8xx_CPU6)
 189         set_dec_cpu6(val - 1);
 190 #else
 191 #ifndef CONFIG_BOOKE
 192         --val;
 193 #endif
 194 #ifdef CONFIG_PPC_ISERIES
 195         if (firmware_has_feature(FW_FEATURE_ISERIES) &&
 196                         get_lppaca()->shared_proc) {
 197                 get_lppaca()->virtual_decr = val;
 198                 if (get_dec() > val)
 199                         HvCall_setVirtualDecr();
 200                 return;
 201         }
 202 #endif
 203         mtspr(SPRN_DEC, val);
 204 #endif /* not 40x or 8xx_CPU6 */
 205 }
 206
 207 static inline unsigned long tb_ticks_since(unsigned long tstamp)
 208 {
 209         if (__USE_RTC()) {
 210                 int delta = get_rtcl() - (unsigned int) tstamp;
 211                 return delta < 0 ? delta + 1000000000 : delta;
 212         }
 213         return get_tbl() - tstamp;
 214 }
 215
 216 #define mulhwu(x,y) \
 217 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
 218
 219 #ifdef CONFIG_PPC64
 220 #define mulhdu(x,y) \
 221 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
 222 #else
 223 extern u64 mulhdu(u64, u64);
 224 #endif
 225
 226 extern void smp_space_timers(unsigned int);
 227
 228 extern unsigned mulhwu_scale_factor(unsigned, unsigned);
 229 extern void div128_by_32(u64 dividend_high, u64 dividend_low,
 230                          unsigned divisor, struct div_result *dr);
 231
 232 /* Used to store Processor Utilization register (purr) values */
 233
 234 struct cpu_usage {
 235         u64 current_tb;  /* Holds the current purr register values */
 236 };
 237
 238 DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
 239
 240 #if defined(CONFIG_VIRT_CPU_ACCOUNTING)
 241 extern void calculate_steal_time(void);
 242 extern void snapshot_timebases(void);
 243 #define account_process_vtime(tsk)              account_process_tick(tsk, 0)
 244 #else
 245 #define calculate_steal_time()                  do { } while (0)
 246 #define snapshot_timebases()                    do { } while (0)
 247 #define account_process_vtime(tsk)              do { } while (0)
 248 #endif
 249
 250 extern void secondary_cpu_time_init(void);
 251 extern void iSeries_time_init_early(void);
 252
 253 #endif /* __KERNEL__ */
 254 #endif /* __POWERPC_TIME_H */