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
  32 struct rtc_time;
  33 extern void to_tm(int tim, struct rtc_time * tm);
  34 extern void GregorianDay(struct rtc_time *tm);
  35
  36 extern void generic_calibrate_decr(void);
  37
  38 extern void set_dec_cpu6(unsigned int val);
  39
  40 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
  41 extern unsigned long ppc_proc_freq;
  42 #define DEFAULT_PROC_FREQ       (DEFAULT_TB_FREQ * 8)
  43 extern unsigned long ppc_tb_freq;
  44 #define DEFAULT_TB_FREQ         125000000UL
  45
  46 struct div_result {
  47         u64 result_high;
  48         u64 result_low;
  49 };
  50
  51 /* Accessor functions for the timebase (RTC on 601) registers. */
  52 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
  53 #ifdef CONFIG_6xx
  54 #define __USE_RTC()     (!cpu_has_feature(CPU_FTR_USE_TB))
  55 #else
  56 #define __USE_RTC()     0
  57 #endif
  58
  59 #ifdef CONFIG_PPC64
  60
  61 /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */
  62 #define get_tbl         get_tb
  63
  64 #else
  65
  66 static inline unsigned long get_tbl(void)
  67 {
  68 #if defined(CONFIG_403GCX)
  69         unsigned long tbl;
  70         asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
  71         return tbl;
  72 #else
  73         return mftbl();
  74 #endif
  75 }
  76
  77 static inline unsigned int get_tbu(void)
  78 {
  79 #ifdef CONFIG_403GCX
  80         unsigned int tbu;
  81         asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
  82         return tbu;
  83 #else
  84         return mftbu();
  85 #endif
  86 }
  87 #endif /* !CONFIG_PPC64 */
  88
  89 static inline unsigned int get_rtcl(void)
  90 {
  91         unsigned int rtcl;
  92
  93         asm volatile("mfrtcl %0" : "=r" (rtcl));
  94         return rtcl;
  95 }
  96
  97 static inline u64 get_rtc(void)
  98 {
  99         unsigned int hi, lo, hi2;
 100
 101         do {
 102                 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
 103                              : "=r" (hi), "=r" (lo), "=r" (hi2));
 104         } while (hi2 != hi);
 105         return (u64)hi * 1000000000 + lo;
 106 }
 107
 108 #ifdef CONFIG_PPC64
 109 static inline u64 get_tb(void)
 110 {
 111         return mftb();
 112 }
 113 #else /* CONFIG_PPC64 */
 114 static inline u64 get_tb(void)
 115 {
 116         unsigned int tbhi, tblo, tbhi2;
 117
 118         do {
 119                 tbhi = get_tbu();
 120                 tblo = get_tbl();
 121                 tbhi2 = get_tbu();
 122         } while (tbhi != tbhi2);
 123
 124         return ((u64)tbhi << 32) | tblo;
 125 }
 126 #endif /* !CONFIG_PPC64 */
 127
 128 static inline u64 get_tb_or_rtc(void)
 129 {
 130         return __USE_RTC() ? get_rtc() : get_tb();
 131 }
 132
 133 static inline void set_tb(unsigned int upper, unsigned int lower)
 134 {
 135         mtspr(SPRN_TBWL, 0);
 136         mtspr(SPRN_TBWU, upper);
 137         mtspr(SPRN_TBWL, lower);
 138 }
 139
 140 /* Accessor functions for the decrementer register.
 141  * The 4xx doesn't even have a decrementer.  I tried to use the
 142  * generic timer interrupt code, which seems OK, with the 4xx PIT
 143  * in auto-reload mode.  The problem is PIT stops counting when it
 144  * hits zero.  If it would wrap, we could use it just like a decrementer.
 145  */
 146 static inline unsigned int get_dec(void)
 147 {
 148 #if defined(CONFIG_40x)
 149         return (mfspr(SPRN_PIT));
 150 #else
 151         return (mfspr(SPRN_DEC));
 152 #endif
 153 }
 154
 155 /*
 156  * Note: Book E and 4xx processors differ from other PowerPC processors
 157  * in when the decrementer generates its interrupt: on the 1 to 0
 158  * transition for Book E/4xx, but on the 0 to -1 transition for others.
 159  */
 160 static inline void set_dec(int val)
 161 {
 162 #if defined(CONFIG_40x)
 163         mtspr(SPRN_PIT, val);
 164 #elif defined(CONFIG_8xx_CPU6)
 165         set_dec_cpu6(val - 1);
 166 #else
 167 #ifndef CONFIG_BOOKE
 168         --val;
 169 #endif
 170 #ifdef CONFIG_PPC_ISERIES
 171         if (firmware_has_feature(FW_FEATURE_ISERIES) &&
 172                         get_lppaca()->shared_proc) {
 173                 get_lppaca()->virtual_decr = val;
 174                 if (get_dec() > val)
 175                         HvCall_setVirtualDecr();
 176                 return;
 177         }
 178 #endif
 179         mtspr(SPRN_DEC, val);
 180 #endif /* not 40x or 8xx_CPU6 */
 181 }
 182
 183 static inline unsigned long tb_ticks_since(unsigned long tstamp)
 184 {
 185         if (__USE_RTC()) {
 186                 int delta = get_rtcl() - (unsigned int) tstamp;
 187                 return delta < 0 ? delta + 1000000000 : delta;
 188         }
 189         return get_tbl() - tstamp;
 190 }
 191
 192 #define mulhwu(x,y) \
 193 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
 194
 195 #ifdef CONFIG_PPC64
 196 #define mulhdu(x,y) \
 197 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
 198 #else
 199 extern u64 mulhdu(u64, u64);
 200 #endif
 201
 202 extern void div128_by_32(u64 dividend_high, u64 dividend_low,
 203                          unsigned divisor, struct div_result *dr);
 204
 205 /* Used to store Processor Utilization register (purr) values */
 206
 207 struct cpu_usage {
 208         u64 current_tb;  /* Holds the current purr register values */
 209 };
 210
 211 DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
 212
 213 #if defined(CONFIG_VIRT_CPU_ACCOUNTING)
 214 #define account_process_vtime(tsk)              account_process_tick(tsk, 0)
 215 #else
 216 #define account_process_vtime(tsk)              do { } while (0)
 217 #endif
 218
 219 extern void secondary_cpu_time_init(void);
 220 extern void iSeries_time_init_early(void);
 221
 222 extern void decrementer_check_overflow(void);
 223
 224 #endif /* __KERNEL__ */
 225 #endif /* __POWERPC_TIME_H */