Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 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/config.h> |
| 18 | #include <linux/types.h> |
| 19 | #include <linux/percpu.h> |
| 20 | |
| 21 | #include <asm/processor.h> |
| 22 | #ifdef CONFIG_PPC64 |
| 23 | #include <asm/paca.h> |
| 24 | #include <asm/iSeries/HvCall.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 | extern u64 tb_last_stamp; |
| 34 | |
| 35 | DECLARE_PER_CPU(unsigned long, last_jiffy); |
| 36 | |
| 37 | struct rtc_time; |
| 38 | extern void to_tm(int tim, struct rtc_time * tm); |
| 39 | extern time_t last_rtc_update; |
| 40 | |
| 41 | extern void generic_calibrate_decr(void); |
| 42 | extern void wakeup_decrementer(void); |
| 43 | |
| 44 | /* Some sane defaults: 125 MHz timebase, 1GHz processor */ |
| 45 | extern unsigned long ppc_proc_freq; |
| 46 | #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8) |
| 47 | extern unsigned long ppc_tb_freq; |
| 48 | #define DEFAULT_TB_FREQ 125000000UL |
| 49 | |
| 50 | /* |
| 51 | * By putting all of this stuff into a single struct we |
| 52 | * reduce the number of cache lines touched by do_gettimeofday. |
| 53 | * Both by collecting all of the data in one cache line and |
| 54 | * by touching only one TOC entry on ppc64. |
| 55 | */ |
| 56 | struct gettimeofday_vars { |
| 57 | u64 tb_to_xs; |
| 58 | u64 stamp_xsec; |
| 59 | u64 tb_orig_stamp; |
| 60 | }; |
| 61 | |
| 62 | struct gettimeofday_struct { |
| 63 | unsigned long tb_ticks_per_sec; |
| 64 | struct gettimeofday_vars vars[2]; |
| 65 | struct gettimeofday_vars * volatile varp; |
| 66 | unsigned var_idx; |
| 67 | unsigned tb_to_us; |
| 68 | }; |
| 69 | |
| 70 | struct div_result { |
| 71 | u64 result_high; |
| 72 | u64 result_low; |
| 73 | }; |
| 74 | |
| 75 | /* Accessor functions for the timebase (RTC on 601) registers. */ |
| 76 | /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */ |
| 77 | #ifdef CONFIG_6xx |
Paul Mackerras | 5d14a18 | 2005-10-20 22:33:06 +1000 | [diff] [blame] | 78 | #define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB)) |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 79 | #else |
| 80 | #define __USE_RTC() 0 |
| 81 | #endif |
| 82 | |
| 83 | /* On ppc64 this gets us the whole timebase; on ppc32 just the lower half */ |
| 84 | static inline unsigned long get_tbl(void) |
| 85 | { |
| 86 | unsigned long tbl; |
| 87 | |
| 88 | #if defined(CONFIG_403GCX) |
| 89 | asm volatile("mfspr %0, 0x3dd" : "=r" (tbl)); |
| 90 | #else |
| 91 | asm volatile("mftb %0" : "=r" (tbl)); |
| 92 | #endif |
| 93 | return tbl; |
| 94 | } |
| 95 | |
| 96 | static inline unsigned int get_tbu(void) |
| 97 | { |
| 98 | unsigned int tbu; |
| 99 | |
| 100 | #if defined(CONFIG_403GCX) |
| 101 | asm volatile("mfspr %0, 0x3dc" : "=r" (tbu)); |
| 102 | #else |
| 103 | asm volatile("mftbu %0" : "=r" (tbu)); |
| 104 | #endif |
| 105 | return tbu; |
| 106 | } |
| 107 | |
| 108 | static inline unsigned int get_rtcl(void) |
| 109 | { |
| 110 | unsigned int rtcl; |
| 111 | |
| 112 | asm volatile("mfrtcl %0" : "=r" (rtcl)); |
| 113 | return rtcl; |
| 114 | } |
| 115 | |
| 116 | #ifdef CONFIG_PPC64 |
| 117 | static inline u64 get_tb(void) |
| 118 | { |
| 119 | return mftb(); |
| 120 | } |
| 121 | #else |
| 122 | static inline u64 get_tb(void) |
| 123 | { |
| 124 | unsigned int tbhi, tblo, tbhi2; |
| 125 | |
| 126 | do { |
| 127 | tbhi = get_tbu(); |
| 128 | tblo = get_tbl(); |
| 129 | tbhi2 = get_tbu(); |
| 130 | } while (tbhi != tbhi2); |
| 131 | |
| 132 | return ((u64)tbhi << 32) | tblo; |
| 133 | } |
| 134 | #endif |
| 135 | |
| 136 | static inline void set_tb(unsigned int upper, unsigned int lower) |
| 137 | { |
| 138 | mtspr(SPRN_TBWL, 0); |
| 139 | mtspr(SPRN_TBWU, upper); |
| 140 | mtspr(SPRN_TBWL, lower); |
| 141 | } |
| 142 | |
| 143 | /* Accessor functions for the decrementer register. |
| 144 | * The 4xx doesn't even have a decrementer. I tried to use the |
| 145 | * generic timer interrupt code, which seems OK, with the 4xx PIT |
| 146 | * in auto-reload mode. The problem is PIT stops counting when it |
| 147 | * hits zero. If it would wrap, we could use it just like a decrementer. |
| 148 | */ |
| 149 | static inline unsigned int get_dec(void) |
| 150 | { |
| 151 | #if defined(CONFIG_40x) |
| 152 | return (mfspr(SPRN_PIT)); |
| 153 | #else |
| 154 | return (mfspr(SPRN_DEC)); |
| 155 | #endif |
| 156 | } |
| 157 | |
| 158 | static inline void set_dec(int val) |
| 159 | { |
| 160 | #if defined(CONFIG_40x) |
| 161 | return; /* Have to let it auto-reload */ |
| 162 | #elif defined(CONFIG_8xx_CPU6) |
| 163 | set_dec_cpu6(val); |
| 164 | #else |
| 165 | #ifdef CONFIG_PPC_ISERIES |
| 166 | struct paca_struct *lpaca = get_paca(); |
| 167 | int cur_dec; |
| 168 | |
| 169 | if (lpaca->lppaca.shared_proc) { |
| 170 | lpaca->lppaca.virtual_decr = val; |
| 171 | cur_dec = get_dec(); |
| 172 | if (cur_dec > val) |
| 173 | HvCall_setVirtualDecr(); |
| 174 | } else |
| 175 | #endif |
| 176 | mtspr(SPRN_DEC, val); |
| 177 | #endif /* not 40x or 8xx_CPU6 */ |
| 178 | } |
| 179 | |
| 180 | static inline unsigned long tb_ticks_since(unsigned long tstamp) |
| 181 | { |
| 182 | if (__USE_RTC()) { |
| 183 | int delta = get_rtcl() - (unsigned int) tstamp; |
| 184 | return delta < 0 ? delta + 1000000000 : delta; |
| 185 | } |
| 186 | return get_tbl() - tstamp; |
| 187 | } |
| 188 | |
| 189 | #define mulhwu(x,y) \ |
| 190 | ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) |
| 191 | |
| 192 | #ifdef CONFIG_PPC64 |
| 193 | #define mulhdu(x,y) \ |
| 194 | ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) |
| 195 | #else |
| 196 | extern u64 mulhdu(u64, u64); |
| 197 | #endif |
| 198 | |
Paul Mackerras | a5b518e | 2005-10-22 14:55:23 +1000 | [diff] [blame] | 199 | extern void smp_space_timers(unsigned int); |
| 200 | |
| 201 | extern unsigned mulhwu_scale_factor(unsigned, unsigned); |
| 202 | extern void div128_by_32(u64 dividend_high, u64 dividend_low, |
| 203 | unsigned divisor, struct div_result *dr); |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 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 | #endif /* __KERNEL__ */ |
| 214 | #endif /* __PPC64_TIME_H */ |