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 #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 void GregorianDay(struct rtc_time *tm);
  37 extern time_t last_rtc_update;
  38
  39 extern void generic_calibrate_decr(void);
  40 extern void wakeup_decrementer(void);
  41 extern void snapshot_timebase(void);
  42
  43 extern void set_dec_cpu6(unsigned int val);
  44
  45 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
  46 extern unsigned long ppc_proc_freq;
  47 #define DEFAULT_PROC_FREQ       (DEFAULT_TB_FREQ * 8)
  48 extern unsigned long ppc_tb_freq;
  49 #define DEFAULT_TB_FREQ         125000000UL
  50
  51 struct div_result {
  52         u64 result_high;
  53         u64 result_low;
  54 };
  55
  56 /* Accessor functions for the timebase (RTC on 601) registers. */
  57 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
  58 #ifdef CONFIG_6xx
  59 #define __USE_RTC()     (!cpu_has_feature(CPU_FTR_USE_TB))
  60 #else
  61 #define __USE_RTC()     0
  62 #endif
  63
  64 #ifdef CONFIG_PPC64
  65
  66 /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */
  67 #define get_tbl         get_tb
  68
  69 #else
  70
  71 static inline unsigned long get_tbl(void)
  72 {
  73 #if defined(CONFIG_403GCX)
  74         unsigned long tbl;
  75         asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
  76         return tbl;
  77 #else
  78         return mftbl();
  79 #endif
  80 }
  81
  82 static inline unsigned int get_tbu(void)
  83 {
  84 #ifdef CONFIG_403GCX
  85         unsigned int tbu;
  86         asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
  87         return tbu;
  88 #else
  89         return mftbu();
  90 #endif
  91 }
  92 #endif /* !CONFIG_PPC64 */
  93
  94 static inline unsigned int get_rtcl(void)
  95 {
  96         unsigned int rtcl;
  97
  98         asm volatile("mfrtcl %0" : "=r" (rtcl));
  99         return rtcl;
 100 }
 101
 102 static inline u64 get_rtc(void)
 103 {
 104         unsigned int hi, lo, hi2;
 105
 106         do {
 107                 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
 108                              : "=r" (hi), "=r" (lo), "=r" (hi2));
 109         } while (hi2 != hi);
 110         return (u64)hi * 1000000000 + lo;
 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 #ifdef CONFIG_PPC_ISERIES
 176         if (firmware_has_feature(FW_FEATURE_ISERIES) &&
 177                         get_lppaca()->shared_proc) {
 178                 get_lppaca()->virtual_decr = val;
 179                 if (get_dec() > val)
 180                         HvCall_setVirtualDecr();
 181                 return;
 182         }
 183 #endif
 184         mtspr(SPRN_DEC, val);
 185 #endif /* not 40x or 8xx_CPU6 */
 186 }
 187
 188 static inline unsigned long tb_ticks_since(unsigned long tstamp)
 189 {
 190         if (__USE_RTC()) {
 191                 int delta = get_rtcl() - (unsigned int) tstamp;
 192                 return delta < 0 ? delta + 1000000000 : delta;
 193         }
 194         return get_tbl() - tstamp;
 195 }
 196
 197 #define mulhwu(x,y) \
 198 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
 199
 200 #ifdef CONFIG_PPC64
 201 #define mulhdu(x,y) \
 202 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
 203 #else
 204 extern u64 mulhdu(u64, u64);
 205 #endif
 206
 207 extern void smp_space_timers(unsigned int);
 208
 209 extern unsigned mulhwu_scale_factor(unsigned, unsigned);
 210 extern void div128_by_32(u64 dividend_high, u64 dividend_low,
 211                          unsigned divisor, struct div_result *dr);
 212
 213 /* Used to store Processor Utilization register (purr) values */
 214
 215 struct cpu_usage {
 216         u64 current_tb;  /* Holds the current purr register values */
 217 };
 218
 219 DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
 220
 221 #if defined(CONFIG_VIRT_CPU_ACCOUNTING)
 222 extern void calculate_steal_time(void);
 223 extern void snapshot_timebases(void);
 224 #define account_process_vtime(tsk)              account_process_tick(tsk, 0)
 225 #else
 226 #define calculate_steal_time()                  do { } while (0)
 227 #define snapshot_timebases()                    do { } while (0)
 228 #define account_process_vtime(tsk)              do { } while (0)
 229 #endif
 230
 231 extern void secondary_cpu_time_init(void);
 232 extern void iSeries_time_init_early(void);
 233
 234 #endif /* __KERNEL__ */
 235 #endif /* __POWERPC_TIME_H */