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