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__ |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 17 | #include <linux/types.h> |
| 18 | #include <linux/percpu.h> |
| 19 | |
| 20 | #include <asm/processor.h> |
Stephen Rothwell | 9b47569 | 2006-06-28 11:51:41 +1000 | [diff] [blame] | 21 | #ifdef CONFIG_PPC_ISERIES |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 22 | #include <asm/paca.h> |
Stephen Rothwell | 9b47569 | 2006-06-28 11:51:41 +1000 | [diff] [blame] | 23 | #include <asm/firmware.h> |
Kelly Daly | 1da4403 | 2005-11-01 16:59:20 +1100 | [diff] [blame] | 24 | #include <asm/iseries/hv_call.h> |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 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; |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 33 | |
| 34 | struct rtc_time; |
| 35 | extern void to_tm(int tim, struct rtc_time * tm); |
| 36 | extern time_t last_rtc_update; |
| 37 | |
| 38 | extern void generic_calibrate_decr(void); |
| 39 | extern void wakeup_decrementer(void); |
Paul Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 40 | extern void snapshot_timebase(void); |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 41 | |
Vitaly Bordug | f2a0bd3 | 2007-01-24 22:41:24 +0300 | [diff] [blame] | 42 | extern void set_dec_cpu6(unsigned int val); |
| 43 | |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 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 | |
Benjamin Herrenschmidt | 859deea | 2006-10-20 14:37:05 +1000 | [diff] [blame] | 83 | #ifdef CONFIG_PPC64 |
| 84 | |
| 85 | /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */ |
| 86 | #define get_tbl get_tb |
| 87 | |
| 88 | #else |
| 89 | |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 90 | static inline unsigned long get_tbl(void) |
| 91 | { |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 92 | #if defined(CONFIG_403GCX) |
Benjamin Herrenschmidt | 859deea | 2006-10-20 14:37:05 +1000 | [diff] [blame] | 93 | unsigned long tbl; |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 94 | asm volatile("mfspr %0, 0x3dd" : "=r" (tbl)); |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 95 | return tbl; |
Benjamin Herrenschmidt | 859deea | 2006-10-20 14:37:05 +1000 | [diff] [blame] | 96 | #else |
| 97 | return mftbl(); |
| 98 | #endif |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 99 | } |
| 100 | |
| 101 | static inline unsigned int get_tbu(void) |
| 102 | { |
Benjamin Herrenschmidt | 859deea | 2006-10-20 14:37:05 +1000 | [diff] [blame] | 103 | #ifdef CONFIG_403GCX |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 104 | unsigned int tbu; |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 105 | asm volatile("mfspr %0, 0x3dc" : "=r" (tbu)); |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 106 | return tbu; |
Benjamin Herrenschmidt | 859deea | 2006-10-20 14:37:05 +1000 | [diff] [blame] | 107 | #else |
| 108 | return mftbu(); |
| 109 | #endif |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 110 | } |
Benjamin Herrenschmidt | 859deea | 2006-10-20 14:37:05 +1000 | [diff] [blame] | 111 | #endif /* !CONFIG_PPC64 */ |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 112 | |
| 113 | static inline unsigned int get_rtcl(void) |
| 114 | { |
| 115 | unsigned int rtcl; |
| 116 | |
| 117 | asm volatile("mfrtcl %0" : "=r" (rtcl)); |
| 118 | return rtcl; |
| 119 | } |
| 120 | |
Paul Mackerras | 96c4450 | 2005-10-23 17:14:56 +1000 | [diff] [blame] | 121 | static inline u64 get_rtc(void) |
| 122 | { |
| 123 | unsigned int hi, lo, hi2; |
| 124 | |
| 125 | do { |
| 126 | asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2" |
| 127 | : "=r" (hi), "=r" (lo), "=r" (hi2)); |
| 128 | } while (hi2 != hi); |
| 129 | return (u64)hi * 1000000000 + lo; |
| 130 | } |
| 131 | |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 132 | #ifdef CONFIG_PPC64 |
| 133 | static inline u64 get_tb(void) |
| 134 | { |
| 135 | return mftb(); |
| 136 | } |
Benjamin Herrenschmidt | 859deea | 2006-10-20 14:37:05 +1000 | [diff] [blame] | 137 | #else /* CONFIG_PPC64 */ |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 138 | static inline u64 get_tb(void) |
| 139 | { |
| 140 | unsigned int tbhi, tblo, tbhi2; |
| 141 | |
| 142 | do { |
| 143 | tbhi = get_tbu(); |
| 144 | tblo = get_tbl(); |
| 145 | tbhi2 = get_tbu(); |
| 146 | } while (tbhi != tbhi2); |
| 147 | |
| 148 | return ((u64)tbhi << 32) | tblo; |
| 149 | } |
Benjamin Herrenschmidt | 859deea | 2006-10-20 14:37:05 +1000 | [diff] [blame] | 150 | #endif /* !CONFIG_PPC64 */ |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 151 | |
Benjamin Herrenschmidt | c27da339 | 2007-09-19 14:21:56 +1000 | [diff] [blame] | 152 | static inline u64 get_tb_or_rtc(void) |
| 153 | { |
| 154 | return __USE_RTC() ? get_rtc() : get_tb(); |
| 155 | } |
| 156 | |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 157 | static inline void set_tb(unsigned int upper, unsigned int lower) |
| 158 | { |
| 159 | mtspr(SPRN_TBWL, 0); |
| 160 | mtspr(SPRN_TBWU, upper); |
| 161 | mtspr(SPRN_TBWL, lower); |
| 162 | } |
| 163 | |
| 164 | /* Accessor functions for the decrementer register. |
| 165 | * The 4xx doesn't even have a decrementer. I tried to use the |
| 166 | * generic timer interrupt code, which seems OK, with the 4xx PIT |
| 167 | * in auto-reload mode. The problem is PIT stops counting when it |
| 168 | * hits zero. If it would wrap, we could use it just like a decrementer. |
| 169 | */ |
| 170 | static inline unsigned int get_dec(void) |
| 171 | { |
| 172 | #if defined(CONFIG_40x) |
| 173 | return (mfspr(SPRN_PIT)); |
| 174 | #else |
| 175 | return (mfspr(SPRN_DEC)); |
| 176 | #endif |
| 177 | } |
| 178 | |
Paul Mackerras | 43875cc | 2007-10-31 22:25:35 +1100 | [diff] [blame] | 179 | /* |
| 180 | * Note: Book E and 4xx processors differ from other PowerPC processors |
| 181 | * in when the decrementer generates its interrupt: on the 1 to 0 |
| 182 | * transition for Book E/4xx, but on the 0 to -1 transition for others. |
| 183 | */ |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 184 | static inline void set_dec(int val) |
| 185 | { |
| 186 | #if defined(CONFIG_40x) |
Josh Boyer | aab6929 | 2007-08-20 07:29:11 -0500 | [diff] [blame] | 187 | mtspr(SPRN_PIT, val); |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 188 | #elif defined(CONFIG_8xx_CPU6) |
Paul Mackerras | 43875cc | 2007-10-31 22:25:35 +1100 | [diff] [blame] | 189 | set_dec_cpu6(val - 1); |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 190 | #else |
Paul Mackerras | 43875cc | 2007-10-31 22:25:35 +1100 | [diff] [blame] | 191 | #ifndef CONFIG_BOOKE |
| 192 | --val; |
| 193 | #endif |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 194 | #ifdef CONFIG_PPC_ISERIES |
Stephen Rothwell | 9b47569 | 2006-06-28 11:51:41 +1000 | [diff] [blame] | 195 | if (firmware_has_feature(FW_FEATURE_ISERIES) && |
| 196 | get_lppaca()->shared_proc) { |
David Gibson | 3356bb9f7 | 2006-01-13 10:26:42 +1100 | [diff] [blame] | 197 | get_lppaca()->virtual_decr = val; |
Paul Mackerras | 43875cc | 2007-10-31 22:25:35 +1100 | [diff] [blame] | 198 | if (get_dec() > val) |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 199 | HvCall_setVirtualDecr(); |
Paul Mackerras | 43875cc | 2007-10-31 22:25:35 +1100 | [diff] [blame] | 200 | return; |
| 201 | } |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 202 | #endif |
Paul Mackerras | 43875cc | 2007-10-31 22:25:35 +1100 | [diff] [blame] | 203 | mtspr(SPRN_DEC, val); |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 204 | #endif /* not 40x or 8xx_CPU6 */ |
| 205 | } |
| 206 | |
| 207 | static inline unsigned long tb_ticks_since(unsigned long tstamp) |
| 208 | { |
| 209 | if (__USE_RTC()) { |
| 210 | int delta = get_rtcl() - (unsigned int) tstamp; |
| 211 | return delta < 0 ? delta + 1000000000 : delta; |
| 212 | } |
| 213 | return get_tbl() - tstamp; |
| 214 | } |
| 215 | |
| 216 | #define mulhwu(x,y) \ |
| 217 | ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) |
| 218 | |
| 219 | #ifdef CONFIG_PPC64 |
| 220 | #define mulhdu(x,y) \ |
| 221 | ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) |
| 222 | #else |
| 223 | extern u64 mulhdu(u64, u64); |
| 224 | #endif |
| 225 | |
Paul Mackerras | a5b518e | 2005-10-22 14:55:23 +1000 | [diff] [blame] | 226 | extern void smp_space_timers(unsigned int); |
| 227 | |
| 228 | extern unsigned mulhwu_scale_factor(unsigned, unsigned); |
| 229 | extern void div128_by_32(u64 dividend_high, u64 dividend_low, |
| 230 | unsigned divisor, struct div_result *dr); |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 231 | |
| 232 | /* Used to store Processor Utilization register (purr) values */ |
| 233 | |
| 234 | struct cpu_usage { |
| 235 | u64 current_tb; /* Holds the current purr register values */ |
| 236 | }; |
| 237 | |
| 238 | DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array); |
| 239 | |
Paul Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 240 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING |
| 241 | extern void account_process_vtime(struct task_struct *tsk); |
| 242 | #else |
| 243 | #define account_process_vtime(tsk) do { } while (0) |
| 244 | #endif |
| 245 | |
Michael Neuling | 4cefebb1 | 2007-06-08 13:18:50 +1000 | [diff] [blame] | 246 | #if defined(CONFIG_VIRT_CPU_ACCOUNTING) |
Paul Mackerras | c6622f6 | 2006-02-24 10:06:59 +1100 | [diff] [blame] | 247 | extern void calculate_steal_time(void); |
| 248 | extern void snapshot_timebases(void); |
| 249 | #else |
| 250 | #define calculate_steal_time() do { } while (0) |
| 251 | #define snapshot_timebases() do { } while (0) |
| 252 | #endif |
| 253 | |
Tony Breeds | d831d0b | 2007-09-21 13:26:03 +1000 | [diff] [blame] | 254 | extern void secondary_cpu_time_init(void); |
Tony Breeds | 71712b4 | 2007-06-22 16:54:30 +1000 | [diff] [blame] | 255 | extern void iSeries_time_init_early(void); |
| 256 | |
Paul Mackerras | f2783c1 | 2005-10-20 09:23:26 +1000 | [diff] [blame] | 257 | #endif /* __KERNEL__ */ |
Kim Phillips | 7a69af6 | 2006-09-26 17:46:37 -0500 | [diff] [blame] | 258 | #endif /* __POWERPC_TIME_H */ |