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