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Paul Mackerrasf2783c12005-10-20 09:23:26 +10001/*
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 Mackerrasf2783c12005-10-20 09:23:26 +100017#include <linux/types.h>
18#include <linux/percpu.h>
19
20#include <asm/processor.h>
Stephen Rothwell9b475692006-06-28 11:51:41 +100021#ifdef CONFIG_PPC_ISERIES
Paul Mackerrasf2783c12005-10-20 09:23:26 +100022#include <asm/paca.h>
Stephen Rothwell9b475692006-06-28 11:51:41 +100023#include <asm/firmware.h>
Kelly Daly1da44032005-11-01 16:59:20 +110024#include <asm/iseries/hv_call.h>
Paul Mackerrasf2783c12005-10-20 09:23:26 +100025#endif
26
27/* time.c */
28extern unsigned long tb_ticks_per_jiffy;
29extern unsigned long tb_ticks_per_usec;
30extern unsigned long tb_ticks_per_sec;
31extern u64 tb_to_xs;
32extern unsigned tb_to_us;
Paul Mackerrasf2783c12005-10-20 09:23:26 +100033
34struct rtc_time;
35extern void to_tm(int tim, struct rtc_time * tm);
36extern time_t last_rtc_update;
37
38extern void generic_calibrate_decr(void);
39extern void wakeup_decrementer(void);
Paul Mackerrasc6622f62006-02-24 10:06:59 +110040extern void snapshot_timebase(void);
Paul Mackerrasf2783c12005-10-20 09:23:26 +100041
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +030042extern void set_dec_cpu6(unsigned int val);
43
Paul Mackerrasf2783c12005-10-20 09:23:26 +100044/* Some sane defaults: 125 MHz timebase, 1GHz processor */
45extern unsigned long ppc_proc_freq;
46#define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8)
47extern 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 */
56struct gettimeofday_vars {
57 u64 tb_to_xs;
58 u64 stamp_xsec;
59 u64 tb_orig_stamp;
60};
61
62struct 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
70struct 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 Mackerras5d14a182005-10-20 22:33:06 +100078#define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB))
Paul Mackerrasf2783c12005-10-20 09:23:26 +100079#else
80#define __USE_RTC() 0
81#endif
82
Benjamin Herrenschmidt859deea2006-10-20 14:37:05 +100083#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 Mackerrasf2783c12005-10-20 09:23:26 +100090static inline unsigned long get_tbl(void)
91{
Paul Mackerrasf2783c12005-10-20 09:23:26 +100092#if defined(CONFIG_403GCX)
Benjamin Herrenschmidt859deea2006-10-20 14:37:05 +100093 unsigned long tbl;
Paul Mackerrasf2783c12005-10-20 09:23:26 +100094 asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
Paul Mackerrasf2783c12005-10-20 09:23:26 +100095 return tbl;
Benjamin Herrenschmidt859deea2006-10-20 14:37:05 +100096#else
97 return mftbl();
98#endif
Paul Mackerrasf2783c12005-10-20 09:23:26 +100099}
100
101static inline unsigned int get_tbu(void)
102{
Benjamin Herrenschmidt859deea2006-10-20 14:37:05 +1000103#ifdef CONFIG_403GCX
Paul Mackerrasf2783c12005-10-20 09:23:26 +1000104 unsigned int tbu;
Paul Mackerrasf2783c12005-10-20 09:23:26 +1000105 asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
Paul Mackerrasf2783c12005-10-20 09:23:26 +1000106 return tbu;
Benjamin Herrenschmidt859deea2006-10-20 14:37:05 +1000107#else
108 return mftbu();
109#endif
Paul Mackerrasf2783c12005-10-20 09:23:26 +1000110}
Benjamin Herrenschmidt859deea2006-10-20 14:37:05 +1000111#endif /* !CONFIG_PPC64 */
Paul Mackerrasf2783c12005-10-20 09:23:26 +1000112
113static 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 Mackerras96c44502005-10-23 17:14:56 +1000121static 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 Mackerrasf2783c12005-10-20 09:23:26 +1000132#ifdef CONFIG_PPC64
133static inline u64 get_tb(void)
134{
135 return mftb();
136}
Benjamin Herrenschmidt859deea2006-10-20 14:37:05 +1000137#else /* CONFIG_PPC64 */
Paul Mackerrasf2783c12005-10-20 09:23:26 +1000138static 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 Herrenschmidt859deea2006-10-20 14:37:05 +1000150#endif /* !CONFIG_PPC64 */
Paul Mackerrasf2783c12005-10-20 09:23:26 +1000151
Benjamin Herrenschmidtc27da332007-09-19 14:21:56 +1000152static inline u64 get_tb_or_rtc(void)
153{
154 return __USE_RTC() ? get_rtc() : get_tb();
155}
156
Paul Mackerrasf2783c12005-10-20 09:23:26 +1000157static 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 */
170static 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 Mackerras43875cc2007-10-31 22:25:35 +1100179/*
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 Mackerrasf2783c12005-10-20 09:23:26 +1000184static inline void set_dec(int val)
185{
186#if defined(CONFIG_40x)
Josh Boyeraab69292007-08-20 07:29:11 -0500187 mtspr(SPRN_PIT, val);
Paul Mackerrasf2783c12005-10-20 09:23:26 +1000188#elif defined(CONFIG_8xx_CPU6)
Paul Mackerras43875cc2007-10-31 22:25:35 +1100189 set_dec_cpu6(val - 1);
Paul Mackerrasf2783c12005-10-20 09:23:26 +1000190#else
Paul Mackerras43875cc2007-10-31 22:25:35 +1100191#ifndef CONFIG_BOOKE
192 --val;
193#endif
Paul Mackerrasf2783c12005-10-20 09:23:26 +1000194#ifdef CONFIG_PPC_ISERIES
Stephen Rothwell9b475692006-06-28 11:51:41 +1000195 if (firmware_has_feature(FW_FEATURE_ISERIES) &&
196 get_lppaca()->shared_proc) {
David Gibson3356bb92006-01-13 10:26:42 +1100197 get_lppaca()->virtual_decr = val;
Paul Mackerras43875cc2007-10-31 22:25:35 +1100198 if (get_dec() > val)
Paul Mackerrasf2783c12005-10-20 09:23:26 +1000199 HvCall_setVirtualDecr();
Paul Mackerras43875cc2007-10-31 22:25:35 +1100200 return;
201 }
Paul Mackerrasf2783c12005-10-20 09:23:26 +1000202#endif
Paul Mackerras43875cc2007-10-31 22:25:35 +1100203 mtspr(SPRN_DEC, val);
Paul Mackerrasf2783c12005-10-20 09:23:26 +1000204#endif /* not 40x or 8xx_CPU6 */
205}
206
207static 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
223extern u64 mulhdu(u64, u64);
224#endif
225
Paul Mackerrasa5b518e2005-10-22 14:55:23 +1000226extern void smp_space_timers(unsigned int);
227
228extern unsigned mulhwu_scale_factor(unsigned, unsigned);
229extern void div128_by_32(u64 dividend_high, u64 dividend_low,
230 unsigned divisor, struct div_result *dr);
Paul Mackerrasf2783c12005-10-20 09:23:26 +1000231
232/* Used to store Processor Utilization register (purr) values */
233
234struct cpu_usage {
235 u64 current_tb; /* Holds the current purr register values */
236};
237
238DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
239
Michael Neuling4cefebb2007-06-08 13:18:50 +1000240#if defined(CONFIG_VIRT_CPU_ACCOUNTING)
Paul Mackerrasc6622f62006-02-24 10:06:59 +1100241extern void calculate_steal_time(void);
242extern void snapshot_timebases(void);
Tony Breeds81a38432007-12-04 16:51:44 +1100243#define account_process_vtime(tsk) account_process_tick(tsk, 0)
Paul Mackerrasc6622f62006-02-24 10:06:59 +1100244#else
245#define calculate_steal_time() do { } while (0)
246#define snapshot_timebases() do { } while (0)
Tony Breeds81a38432007-12-04 16:51:44 +1100247#define account_process_vtime(tsk) do { } while (0)
Paul Mackerrasc6622f62006-02-24 10:06:59 +1100248#endif
249
Tony Breedsd831d0b2007-09-21 13:26:03 +1000250extern void secondary_cpu_time_init(void);
Tony Breeds71712b42007-06-22 16:54:30 +1000251extern void iSeries_time_init_early(void);
252
Paul Mackerrasf2783c12005-10-20 09:23:26 +1000253#endif /* __KERNEL__ */
Kim Phillips7a69af62006-09-26 17:46:37 -0500254#endif /* __POWERPC_TIME_H */