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 #include <asm/cpu_has_feature.h>
  22
  23 /* time.c */
  24 extern unsigned long tb_ticks_per_jiffy;
  25 extern unsigned long tb_ticks_per_usec;
  26 extern unsigned long tb_ticks_per_sec;
  27 extern struct clock_event_device decrementer_clockevent;
  28
  29 struct rtc_time;
  30 extern void to_tm(int tim, struct rtc_time * tm);
  31 extern void tick_broadcast_ipi_handler(void);
  32
  33 extern void generic_calibrate_decr(void);
  34
  35 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
  36 extern unsigned long ppc_proc_freq;
  37 #define DEFAULT_PROC_FREQ       (DEFAULT_TB_FREQ * 8)
  38 extern unsigned long ppc_tb_freq;
  39 #define DEFAULT_TB_FREQ         125000000UL
  40
  41 struct div_result {
  42         u64 result_high;
  43         u64 result_low;
  44 };
  45
  46 /* Accessor functions for the timebase (RTC on 601) registers. */
  47 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
  48 #ifdef CONFIG_6xx
  49 #define __USE_RTC()     (!cpu_has_feature(CPU_FTR_USE_TB))
  50 #else
  51 #define __USE_RTC()     0
  52 #endif
  53
  54 #ifdef CONFIG_PPC64
  55
  56 /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */
  57 #define get_tbl         get_tb
  58
  59 #else
  60
  61 static inline unsigned long get_tbl(void)
  62 {
  63 #if defined(CONFIG_403GCX)
  64         unsigned long tbl;
  65         asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
  66         return tbl;
  67 #else
  68         return mftbl();
  69 #endif
  70 }
  71
  72 static inline unsigned int get_tbu(void)
  73 {
  74 #ifdef CONFIG_403GCX
  75         unsigned int tbu;
  76         asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
  77         return tbu;
  78 #else
  79         return mftbu();
  80 #endif
  81 }
  82 #endif /* !CONFIG_PPC64 */
  83
  84 static inline unsigned int get_rtcl(void)
  85 {
  86         unsigned int rtcl;
  87
  88         asm volatile("mfrtcl %0" : "=r" (rtcl));
  89         return rtcl;
  90 }
  91
  92 static inline u64 get_rtc(void)
  93 {
  94         unsigned int hi, lo, hi2;
  95
  96         do {
  97                 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
  98                              : "=r" (hi), "=r" (lo), "=r" (hi2));
  99         } while (hi2 != hi);
 100         return (u64)hi * 1000000000 + lo;
 101 }
 102
 103 static inline u64 get_vtb(void)
 104 {
 105 #ifdef CONFIG_PPC_BOOK3S_64
 106         if (cpu_has_feature(CPU_FTR_ARCH_207S))
 107                 return mfspr(SPRN_VTB);
 108 #endif
 109         return 0;
 110 }
 111
 112 #ifdef CONFIG_PPC64
 113 static inline u64 get_tb(void)
 114 {
 115         return mftb();
 116 }
 117 #else /* CONFIG_PPC64 */
 118 static inline u64 get_tb(void)
 119 {
 120         unsigned int tbhi, tblo, tbhi2;
 121
 122         do {
 123                 tbhi = get_tbu();
 124                 tblo = get_tbl();
 125                 tbhi2 = get_tbu();
 126         } while (tbhi != tbhi2);
 127
 128         return ((u64)tbhi << 32) | tblo;
 129 }
 130 #endif /* !CONFIG_PPC64 */
 131
 132 static inline u64 get_tb_or_rtc(void)
 133 {
 134         return __USE_RTC() ? get_rtc() : get_tb();
 135 }
 136
 137 static inline void set_tb(unsigned int upper, unsigned int lower)
 138 {
 139         mtspr(SPRN_TBWL, 0);
 140         mtspr(SPRN_TBWU, upper);
 141         mtspr(SPRN_TBWL, lower);
 142 }
 143
 144 /* Accessor functions for the decrementer register.
 145  * The 4xx doesn't even have a decrementer.  I tried to use the
 146  * generic timer interrupt code, which seems OK, with the 4xx PIT
 147  * in auto-reload mode.  The problem is PIT stops counting when it
 148  * hits zero.  If it would wrap, we could use it just like a decrementer.
 149  */
 150 static inline u64 get_dec(void)
 151 {
 152 #if defined(CONFIG_40x)
 153         return (mfspr(SPRN_PIT));
 154 #else
 155         return (mfspr(SPRN_DEC));
 156 #endif
 157 }
 158
 159 /*
 160  * Note: Book E and 4xx processors differ from other PowerPC processors
 161  * in when the decrementer generates its interrupt: on the 1 to 0
 162  * transition for Book E/4xx, but on the 0 to -1 transition for others.
 163  */
 164 static inline void set_dec(u64 val)
 165 {
 166 #if defined(CONFIG_40x)
 167         mtspr(SPRN_PIT, (u32) val);
 168 #else
 169 #ifndef CONFIG_BOOKE
 170         --val;
 171 #endif
 172         mtspr(SPRN_DEC, val);
 173 #endif /* not 40x */
 174 }
 175
 176 static inline unsigned long tb_ticks_since(unsigned long tstamp)
 177 {
 178         if (__USE_RTC()) {
 179                 int delta = get_rtcl() - (unsigned int) tstamp;
 180                 return delta < 0 ? delta + 1000000000 : delta;
 181         }
 182         return get_tbl() - tstamp;
 183 }
 184
 185 #define mulhwu(x,y) \
 186 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
 187
 188 #ifdef CONFIG_PPC64
 189 #define mulhdu(x,y) \
 190 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
 191 #else
 192 extern u64 mulhdu(u64, u64);
 193 #endif
 194
 195 extern void div128_by_32(u64 dividend_high, u64 dividend_low,
 196                          unsigned divisor, struct div_result *dr);
 197
 198 /* Used to store Processor Utilization register (purr) values */
 199
 200 struct cpu_usage {
 201         u64 current_tb;  /* Holds the current purr register values */
 202 };
 203
 204 DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
 205
 206 extern void secondary_cpu_time_init(void);
 207
 208 DECLARE_PER_CPU(u64, decrementers_next_tb);
 209
 210 /* Convert timebase ticks to nanoseconds */
 211 unsigned long long tb_to_ns(unsigned long long tb_ticks);
 212
 213 #endif /* __KERNEL__ */
 214 #endif /* __POWERPC_TIME_H */