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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__ | |
f2783c15 PM |
17 | #include <linux/types.h> |
18 | #include <linux/percpu.h> | |
19 | ||
20 | #include <asm/processor.h> | |
9b47569a | 21 | #ifdef CONFIG_PPC_ISERIES |
f2783c15 | 22 | #include <asm/paca.h> |
9b47569a | 23 | #include <asm/firmware.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; | |
f2783c15 PM |
33 | |
34 | struct rtc_time; | |
35 | extern void to_tm(int tim, struct rtc_time * tm); | |
1c21a293 | 36 | extern void GregorianDay(struct rtc_time *tm); |
f2783c15 PM |
37 | extern time_t last_rtc_update; |
38 | ||
39 | extern void generic_calibrate_decr(void); | |
40 | extern void wakeup_decrementer(void); | |
c6622f63 | 41 | extern void snapshot_timebase(void); |
f2783c15 | 42 | |
f2a0bd37 VB |
43 | extern void set_dec_cpu6(unsigned int val); |
44 | ||
f2783c15 PM |
45 | /* Some sane defaults: 125 MHz timebase, 1GHz processor */ |
46 | extern unsigned long ppc_proc_freq; | |
47 | #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8) | |
48 | extern unsigned long ppc_tb_freq; | |
49 | #define DEFAULT_TB_FREQ 125000000UL | |
50 | ||
51 | /* | |
52 | * By putting all of this stuff into a single struct we | |
53 | * reduce the number of cache lines touched by do_gettimeofday. | |
54 | * Both by collecting all of the data in one cache line and | |
55 | * by touching only one TOC entry on ppc64. | |
56 | */ | |
57 | struct gettimeofday_vars { | |
58 | u64 tb_to_xs; | |
59 | u64 stamp_xsec; | |
60 | u64 tb_orig_stamp; | |
61 | }; | |
62 | ||
63 | struct gettimeofday_struct { | |
64 | unsigned long tb_ticks_per_sec; | |
65 | struct gettimeofday_vars vars[2]; | |
66 | struct gettimeofday_vars * volatile varp; | |
67 | unsigned var_idx; | |
68 | unsigned tb_to_us; | |
69 | }; | |
70 | ||
71 | struct div_result { | |
72 | u64 result_high; | |
73 | u64 result_low; | |
74 | }; | |
75 | ||
76 | /* Accessor functions for the timebase (RTC on 601) registers. */ | |
77 | /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */ | |
78 | #ifdef CONFIG_6xx | |
5d14a18d | 79 | #define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB)) |
f2783c15 PM |
80 | #else |
81 | #define __USE_RTC() 0 | |
82 | #endif | |
83 | ||
859deea9 BH |
84 | #ifdef CONFIG_PPC64 |
85 | ||
86 | /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */ | |
87 | #define get_tbl get_tb | |
88 | ||
89 | #else | |
90 | ||
f2783c15 PM |
91 | static inline unsigned long get_tbl(void) |
92 | { | |
f2783c15 | 93 | #if defined(CONFIG_403GCX) |
859deea9 | 94 | unsigned long tbl; |
f2783c15 | 95 | asm volatile("mfspr %0, 0x3dd" : "=r" (tbl)); |
859deea9 | 96 | return tbl; |
f2783c15 | 97 | #else |
859deea9 | 98 | return mftbl(); |
f2783c15 | 99 | #endif |
f2783c15 PM |
100 | } |
101 | ||
102 | static inline unsigned int get_tbu(void) | |
103 | { | |
859deea9 | 104 | #ifdef CONFIG_403GCX |
f2783c15 | 105 | unsigned int tbu; |
f2783c15 | 106 | asm volatile("mfspr %0, 0x3dc" : "=r" (tbu)); |
859deea9 | 107 | return tbu; |
f2783c15 | 108 | #else |
859deea9 | 109 | return mftbu(); |
f2783c15 | 110 | #endif |
f2783c15 | 111 | } |
859deea9 | 112 | #endif /* !CONFIG_PPC64 */ |
f2783c15 PM |
113 | |
114 | static inline unsigned int get_rtcl(void) | |
115 | { | |
116 | unsigned int rtcl; | |
117 | ||
118 | asm volatile("mfrtcl %0" : "=r" (rtcl)); | |
119 | return rtcl; | |
120 | } | |
121 | ||
96c44507 PM |
122 | static inline u64 get_rtc(void) |
123 | { | |
124 | unsigned int hi, lo, hi2; | |
125 | ||
126 | do { | |
127 | asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2" | |
128 | : "=r" (hi), "=r" (lo), "=r" (hi2)); | |
129 | } while (hi2 != hi); | |
130 | return (u64)hi * 1000000000 + lo; | |
131 | } | |
132 | ||
f2783c15 PM |
133 | #ifdef CONFIG_PPC64 |
134 | static inline u64 get_tb(void) | |
135 | { | |
136 | return mftb(); | |
137 | } | |
859deea9 | 138 | #else /* CONFIG_PPC64 */ |
f2783c15 PM |
139 | static inline u64 get_tb(void) |
140 | { | |
141 | unsigned int tbhi, tblo, tbhi2; | |
142 | ||
143 | do { | |
144 | tbhi = get_tbu(); | |
145 | tblo = get_tbl(); | |
146 | tbhi2 = get_tbu(); | |
147 | } while (tbhi != tbhi2); | |
148 | ||
149 | return ((u64)tbhi << 32) | tblo; | |
150 | } | |
859deea9 | 151 | #endif /* !CONFIG_PPC64 */ |
f2783c15 | 152 | |
c27da339 BH |
153 | static inline u64 get_tb_or_rtc(void) |
154 | { | |
155 | return __USE_RTC() ? get_rtc() : get_tb(); | |
156 | } | |
157 | ||
f2783c15 PM |
158 | static inline void set_tb(unsigned int upper, unsigned int lower) |
159 | { | |
160 | mtspr(SPRN_TBWL, 0); | |
161 | mtspr(SPRN_TBWU, upper); | |
162 | mtspr(SPRN_TBWL, lower); | |
163 | } | |
164 | ||
165 | /* Accessor functions for the decrementer register. | |
166 | * The 4xx doesn't even have a decrementer. I tried to use the | |
167 | * generic timer interrupt code, which seems OK, with the 4xx PIT | |
168 | * in auto-reload mode. The problem is PIT stops counting when it | |
169 | * hits zero. If it would wrap, we could use it just like a decrementer. | |
170 | */ | |
171 | static inline unsigned int get_dec(void) | |
172 | { | |
173 | #if defined(CONFIG_40x) | |
174 | return (mfspr(SPRN_PIT)); | |
175 | #else | |
176 | return (mfspr(SPRN_DEC)); | |
177 | #endif | |
178 | } | |
179 | ||
43875cc0 PM |
180 | /* |
181 | * Note: Book E and 4xx processors differ from other PowerPC processors | |
182 | * in when the decrementer generates its interrupt: on the 1 to 0 | |
183 | * transition for Book E/4xx, but on the 0 to -1 transition for others. | |
184 | */ | |
f2783c15 PM |
185 | static inline void set_dec(int val) |
186 | { | |
187 | #if defined(CONFIG_40x) | |
aab69292 | 188 | mtspr(SPRN_PIT, val); |
f2783c15 | 189 | #elif defined(CONFIG_8xx_CPU6) |
43875cc0 | 190 | set_dec_cpu6(val - 1); |
f2783c15 | 191 | #else |
43875cc0 PM |
192 | #ifndef CONFIG_BOOKE |
193 | --val; | |
194 | #endif | |
f2783c15 | 195 | #ifdef CONFIG_PPC_ISERIES |
9b47569a SR |
196 | if (firmware_has_feature(FW_FEATURE_ISERIES) && |
197 | get_lppaca()->shared_proc) { | |
3356bb9f | 198 | get_lppaca()->virtual_decr = val; |
43875cc0 | 199 | if (get_dec() > val) |
f2783c15 | 200 | HvCall_setVirtualDecr(); |
43875cc0 PM |
201 | return; |
202 | } | |
f2783c15 | 203 | #endif |
43875cc0 | 204 | mtspr(SPRN_DEC, val); |
f2783c15 PM |
205 | #endif /* not 40x or 8xx_CPU6 */ |
206 | } | |
207 | ||
208 | static inline unsigned long tb_ticks_since(unsigned long tstamp) | |
209 | { | |
210 | if (__USE_RTC()) { | |
211 | int delta = get_rtcl() - (unsigned int) tstamp; | |
212 | return delta < 0 ? delta + 1000000000 : delta; | |
213 | } | |
214 | return get_tbl() - tstamp; | |
215 | } | |
216 | ||
217 | #define mulhwu(x,y) \ | |
218 | ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) | |
219 | ||
220 | #ifdef CONFIG_PPC64 | |
221 | #define mulhdu(x,y) \ | |
222 | ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) | |
223 | #else | |
224 | extern u64 mulhdu(u64, u64); | |
225 | #endif | |
226 | ||
a5b518ed PM |
227 | extern void smp_space_timers(unsigned int); |
228 | ||
229 | extern unsigned mulhwu_scale_factor(unsigned, unsigned); | |
230 | extern void div128_by_32(u64 dividend_high, u64 dividend_low, | |
231 | unsigned divisor, struct div_result *dr); | |
f2783c15 PM |
232 | |
233 | /* Used to store Processor Utilization register (purr) values */ | |
234 | ||
235 | struct cpu_usage { | |
236 | u64 current_tb; /* Holds the current purr register values */ | |
237 | }; | |
238 | ||
239 | DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array); | |
240 | ||
4cefebb1 | 241 | #if defined(CONFIG_VIRT_CPU_ACCOUNTING) |
c6622f63 PM |
242 | extern void calculate_steal_time(void); |
243 | extern void snapshot_timebases(void); | |
81a3843f | 244 | #define account_process_vtime(tsk) account_process_tick(tsk, 0) |
c6622f63 PM |
245 | #else |
246 | #define calculate_steal_time() do { } while (0) | |
247 | #define snapshot_timebases() do { } while (0) | |
81a3843f | 248 | #define account_process_vtime(tsk) do { } while (0) |
c6622f63 PM |
249 | #endif |
250 | ||
d831d0b8 | 251 | extern void secondary_cpu_time_init(void); |
71712b45 TB |
252 | extern void iSeries_time_init_early(void); |
253 | ||
f2783c15 | 254 | #endif /* __KERNEL__ */ |
7a69af63 | 255 | #endif /* __POWERPC_TIME_H */ |