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f2783c15 PM |
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> | |
1da44037 | 24 | #include <asm/iseries/hv_call.h> |
f2783c15 PM |
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; | |
96c44507 PM |
33 | extern unsigned long tb_last_stamp; |
34 | extern u64 tb_last_jiffy; | |
f2783c15 PM |
35 | |
36 | DECLARE_PER_CPU(unsigned long, last_jiffy); | |
37 | ||
38 | struct rtc_time; | |
39 | extern void to_tm(int tim, struct rtc_time * tm); | |
40 | extern time_t last_rtc_update; | |
41 | ||
42 | extern void generic_calibrate_decr(void); | |
43 | extern void wakeup_decrementer(void); | |
c6622f63 | 44 | extern void snapshot_timebase(void); |
f2783c15 PM |
45 | |
46 | /* Some sane defaults: 125 MHz timebase, 1GHz processor */ | |
47 | extern unsigned long ppc_proc_freq; | |
48 | #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8) | |
49 | extern unsigned long ppc_tb_freq; | |
50 | #define DEFAULT_TB_FREQ 125000000UL | |
51 | ||
52 | /* | |
53 | * By putting all of this stuff into a single struct we | |
54 | * reduce the number of cache lines touched by do_gettimeofday. | |
55 | * Both by collecting all of the data in one cache line and | |
56 | * by touching only one TOC entry on ppc64. | |
57 | */ | |
58 | struct gettimeofday_vars { | |
59 | u64 tb_to_xs; | |
60 | u64 stamp_xsec; | |
61 | u64 tb_orig_stamp; | |
62 | }; | |
63 | ||
64 | struct gettimeofday_struct { | |
65 | unsigned long tb_ticks_per_sec; | |
66 | struct gettimeofday_vars vars[2]; | |
67 | struct gettimeofday_vars * volatile varp; | |
68 | unsigned var_idx; | |
69 | unsigned tb_to_us; | |
70 | }; | |
71 | ||
72 | struct div_result { | |
73 | u64 result_high; | |
74 | u64 result_low; | |
75 | }; | |
76 | ||
77 | /* Accessor functions for the timebase (RTC on 601) registers. */ | |
78 | /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */ | |
79 | #ifdef CONFIG_6xx | |
5d14a18d | 80 | #define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB)) |
f2783c15 PM |
81 | #else |
82 | #define __USE_RTC() 0 | |
83 | #endif | |
84 | ||
85 | /* On ppc64 this gets us the whole timebase; on ppc32 just the lower half */ | |
86 | static inline unsigned long get_tbl(void) | |
87 | { | |
88 | unsigned long tbl; | |
89 | ||
90 | #if defined(CONFIG_403GCX) | |
91 | asm volatile("mfspr %0, 0x3dd" : "=r" (tbl)); | |
92 | #else | |
93 | asm volatile("mftb %0" : "=r" (tbl)); | |
94 | #endif | |
95 | return tbl; | |
96 | } | |
97 | ||
98 | static inline unsigned int get_tbu(void) | |
99 | { | |
100 | unsigned int tbu; | |
101 | ||
102 | #if defined(CONFIG_403GCX) | |
103 | asm volatile("mfspr %0, 0x3dc" : "=r" (tbu)); | |
104 | #else | |
105 | asm volatile("mftbu %0" : "=r" (tbu)); | |
106 | #endif | |
107 | return tbu; | |
108 | } | |
109 | ||
110 | static inline unsigned int get_rtcl(void) | |
111 | { | |
112 | unsigned int rtcl; | |
113 | ||
114 | asm volatile("mfrtcl %0" : "=r" (rtcl)); | |
115 | return rtcl; | |
116 | } | |
117 | ||
96c44507 PM |
118 | static inline u64 get_rtc(void) |
119 | { | |
120 | unsigned int hi, lo, hi2; | |
121 | ||
122 | do { | |
123 | asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2" | |
124 | : "=r" (hi), "=r" (lo), "=r" (hi2)); | |
125 | } while (hi2 != hi); | |
126 | return (u64)hi * 1000000000 + lo; | |
127 | } | |
128 | ||
f2783c15 PM |
129 | #ifdef CONFIG_PPC64 |
130 | static inline u64 get_tb(void) | |
131 | { | |
132 | return mftb(); | |
133 | } | |
134 | #else | |
135 | static inline u64 get_tb(void) | |
136 | { | |
137 | unsigned int tbhi, tblo, tbhi2; | |
138 | ||
139 | do { | |
140 | tbhi = get_tbu(); | |
141 | tblo = get_tbl(); | |
142 | tbhi2 = get_tbu(); | |
143 | } while (tbhi != tbhi2); | |
144 | ||
145 | return ((u64)tbhi << 32) | tblo; | |
146 | } | |
147 | #endif | |
148 | ||
149 | static inline void set_tb(unsigned int upper, unsigned int lower) | |
150 | { | |
151 | mtspr(SPRN_TBWL, 0); | |
152 | mtspr(SPRN_TBWU, upper); | |
153 | mtspr(SPRN_TBWL, lower); | |
154 | } | |
155 | ||
156 | /* Accessor functions for the decrementer register. | |
157 | * The 4xx doesn't even have a decrementer. I tried to use the | |
158 | * generic timer interrupt code, which seems OK, with the 4xx PIT | |
159 | * in auto-reload mode. The problem is PIT stops counting when it | |
160 | * hits zero. If it would wrap, we could use it just like a decrementer. | |
161 | */ | |
162 | static inline unsigned int get_dec(void) | |
163 | { | |
164 | #if defined(CONFIG_40x) | |
165 | return (mfspr(SPRN_PIT)); | |
166 | #else | |
167 | return (mfspr(SPRN_DEC)); | |
168 | #endif | |
169 | } | |
170 | ||
171 | static inline void set_dec(int val) | |
172 | { | |
173 | #if defined(CONFIG_40x) | |
174 | return; /* Have to let it auto-reload */ | |
175 | #elif defined(CONFIG_8xx_CPU6) | |
176 | set_dec_cpu6(val); | |
177 | #else | |
178 | #ifdef CONFIG_PPC_ISERIES | |
f2783c15 PM |
179 | int cur_dec; |
180 | ||
3356bb9f DG |
181 | if (get_lppaca()->shared_proc) { |
182 | get_lppaca()->virtual_decr = val; | |
f2783c15 PM |
183 | cur_dec = get_dec(); |
184 | if (cur_dec > val) | |
185 | HvCall_setVirtualDecr(); | |
186 | } else | |
187 | #endif | |
188 | mtspr(SPRN_DEC, val); | |
189 | #endif /* not 40x or 8xx_CPU6 */ | |
190 | } | |
191 | ||
192 | static inline unsigned long tb_ticks_since(unsigned long tstamp) | |
193 | { | |
194 | if (__USE_RTC()) { | |
195 | int delta = get_rtcl() - (unsigned int) tstamp; | |
196 | return delta < 0 ? delta + 1000000000 : delta; | |
197 | } | |
198 | return get_tbl() - tstamp; | |
199 | } | |
200 | ||
201 | #define mulhwu(x,y) \ | |
202 | ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) | |
203 | ||
204 | #ifdef CONFIG_PPC64 | |
205 | #define mulhdu(x,y) \ | |
206 | ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) | |
207 | #else | |
208 | extern u64 mulhdu(u64, u64); | |
209 | #endif | |
210 | ||
a5b518ed PM |
211 | extern void smp_space_timers(unsigned int); |
212 | ||
213 | extern unsigned mulhwu_scale_factor(unsigned, unsigned); | |
214 | extern void div128_by_32(u64 dividend_high, u64 dividend_low, | |
215 | unsigned divisor, struct div_result *dr); | |
f2783c15 PM |
216 | |
217 | /* Used to store Processor Utilization register (purr) values */ | |
218 | ||
219 | struct cpu_usage { | |
220 | u64 current_tb; /* Holds the current purr register values */ | |
221 | }; | |
222 | ||
223 | DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array); | |
224 | ||
c6622f63 PM |
225 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING |
226 | extern void account_process_vtime(struct task_struct *tsk); | |
227 | #else | |
228 | #define account_process_vtime(tsk) do { } while (0) | |
229 | #endif | |
230 | ||
231 | #if defined(CONFIG_VIRT_CPU_ACCOUNTING) && defined(CONFIG_PPC_SPLPAR) | |
232 | extern void calculate_steal_time(void); | |
233 | extern void snapshot_timebases(void); | |
234 | #else | |
235 | #define calculate_steal_time() do { } while (0) | |
236 | #define snapshot_timebases() do { } while (0) | |
237 | #endif | |
238 | ||
f2783c15 PM |
239 | #endif /* __KERNEL__ */ |
240 | #endif /* __PPC64_TIME_H */ |