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c104c15c
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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 time_t last_rtc_update;
37
38 extern void generic_calibrate_decr(void);
39 extern void wakeup_decrementer(void);
40 extern void snapshot_timebase(void);
41
42 extern void set_dec_cpu6(unsigned int val);
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
78 #define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB))
79 #else
80 #define __USE_RTC() 0
81 #endif
82
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
90 static inline unsigned long get_tbl(void)
91 {
92 #if defined(CONFIG_403GCX)
93 unsigned long tbl;
94 asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
95 return tbl;
96 #else
97 return mftbl();
98 #endif
99 }
100
101 static inline unsigned int get_tbu(void)
102 {
103 #ifdef CONFIG_403GCX
104 unsigned int tbu;
105 asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
106 return tbu;
107 #else
108 return mftbu();
109 #endif
110 }
111 #endif /* !CONFIG_PPC64 */
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
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
132 #ifdef CONFIG_PPC64
133 static inline u64 get_tb(void)
134 {
135 return mftb();
136 }
137 #else /* CONFIG_PPC64 */
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 }
150 #endif /* !CONFIG_PPC64 */
151
152 static inline u64 get_tb_or_rtc(void)
153 {
154 return __USE_RTC() ? get_rtc() : get_tb();
155 }
156
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
179 static inline void set_dec(int val)
180 {
181 #if defined(CONFIG_40x)
182 return; /* Have to let it auto-reload */
183 #elif defined(CONFIG_8xx_CPU6)
184 set_dec_cpu6(val);
185 #else
186 #ifdef CONFIG_PPC_ISERIES
187 int cur_dec;
188
189 if (firmware_has_feature(FW_FEATURE_ISERIES) &&
190 get_lppaca()->shared_proc) {
191 get_lppaca()->virtual_decr = val;
192 cur_dec = get_dec();
193 if (cur_dec > val)
194 HvCall_setVirtualDecr();
195 } else
196 #endif
197 mtspr(SPRN_DEC, val);
198 #endif /* not 40x or 8xx_CPU6 */
199 }
200
201 static inline unsigned long tb_ticks_since(unsigned long tstamp)
202 {
203 if (__USE_RTC()) {
204 int delta = get_rtcl() - (unsigned int) tstamp;
205 return delta < 0 ? delta + 1000000000 : delta;
206 }
207 return get_tbl() - tstamp;
208 }
209
210 #define mulhwu(x,y) \
211 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
212
213 #ifdef CONFIG_PPC64
214 #define mulhdu(x,y) \
215 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
216 #else
217 extern u64 mulhdu(u64, u64);
218 #endif
219
220 extern void smp_space_timers(unsigned int);
221
222 extern unsigned mulhwu_scale_factor(unsigned, unsigned);
223 extern void div128_by_32(u64 dividend_high, u64 dividend_low,
224 unsigned divisor, struct div_result *dr);
225
226 /* Used to store Processor Utilization register (purr) values */
227
228 struct cpu_usage {
229 u64 current_tb; /* Holds the current purr register values */
230 };
231
232 DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
233
234 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
235 extern void account_process_vtime(struct task_struct *tsk);
236 #else
237 #define account_process_vtime(tsk) do { } while (0)
238 #endif
239
240 #if defined(CONFIG_VIRT_CPU_ACCOUNTING)
241 extern void calculate_steal_time(void);
242 extern void snapshot_timebases(void);
243 #else
244 #define calculate_steal_time() do { } while (0)
245 #define snapshot_timebases() do { } while (0)
246 #endif
247
248 extern void iSeries_time_init_early(void);
249
250 #endif /* __KERNEL__ */
251 #endif /* __POWERPC_TIME_H */
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