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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 | ||
f2783c15 PM |
51 | struct div_result { |
52 | u64 result_high; | |
53 | u64 result_low; | |
54 | }; | |
55 | ||
56 | /* Accessor functions for the timebase (RTC on 601) registers. */ | |
57 | /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */ | |
58 | #ifdef CONFIG_6xx | |
5d14a18d | 59 | #define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB)) |
f2783c15 PM |
60 | #else |
61 | #define __USE_RTC() 0 | |
62 | #endif | |
63 | ||
859deea9 BH |
64 | #ifdef CONFIG_PPC64 |
65 | ||
66 | /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */ | |
67 | #define get_tbl get_tb | |
68 | ||
69 | #else | |
70 | ||
f2783c15 PM |
71 | static inline unsigned long get_tbl(void) |
72 | { | |
f2783c15 | 73 | #if defined(CONFIG_403GCX) |
859deea9 | 74 | unsigned long tbl; |
f2783c15 | 75 | asm volatile("mfspr %0, 0x3dd" : "=r" (tbl)); |
859deea9 | 76 | return tbl; |
f2783c15 | 77 | #else |
859deea9 | 78 | return mftbl(); |
f2783c15 | 79 | #endif |
f2783c15 PM |
80 | } |
81 | ||
82 | static inline unsigned int get_tbu(void) | |
83 | { | |
859deea9 | 84 | #ifdef CONFIG_403GCX |
f2783c15 | 85 | unsigned int tbu; |
f2783c15 | 86 | asm volatile("mfspr %0, 0x3dc" : "=r" (tbu)); |
859deea9 | 87 | return tbu; |
f2783c15 | 88 | #else |
859deea9 | 89 | return mftbu(); |
f2783c15 | 90 | #endif |
f2783c15 | 91 | } |
859deea9 | 92 | #endif /* !CONFIG_PPC64 */ |
f2783c15 PM |
93 | |
94 | static inline unsigned int get_rtcl(void) | |
95 | { | |
96 | unsigned int rtcl; | |
97 | ||
98 | asm volatile("mfrtcl %0" : "=r" (rtcl)); | |
99 | return rtcl; | |
100 | } | |
101 | ||
96c44507 PM |
102 | static inline u64 get_rtc(void) |
103 | { | |
104 | unsigned int hi, lo, hi2; | |
105 | ||
106 | do { | |
107 | asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2" | |
108 | : "=r" (hi), "=r" (lo), "=r" (hi2)); | |
109 | } while (hi2 != hi); | |
110 | return (u64)hi * 1000000000 + lo; | |
111 | } | |
112 | ||
f2783c15 PM |
113 | #ifdef CONFIG_PPC64 |
114 | static inline u64 get_tb(void) | |
115 | { | |
116 | return mftb(); | |
117 | } | |
859deea9 | 118 | #else /* CONFIG_PPC64 */ |
f2783c15 PM |
119 | static inline u64 get_tb(void) |
120 | { | |
121 | unsigned int tbhi, tblo, tbhi2; | |
122 | ||
123 | do { | |
124 | tbhi = get_tbu(); | |
125 | tblo = get_tbl(); | |
126 | tbhi2 = get_tbu(); | |
127 | } while (tbhi != tbhi2); | |
128 | ||
129 | return ((u64)tbhi << 32) | tblo; | |
130 | } | |
859deea9 | 131 | #endif /* !CONFIG_PPC64 */ |
f2783c15 | 132 | |
c27da339 BH |
133 | static inline u64 get_tb_or_rtc(void) |
134 | { | |
135 | return __USE_RTC() ? get_rtc() : get_tb(); | |
136 | } | |
137 | ||
f2783c15 PM |
138 | static inline void set_tb(unsigned int upper, unsigned int lower) |
139 | { | |
140 | mtspr(SPRN_TBWL, 0); | |
141 | mtspr(SPRN_TBWU, upper); | |
142 | mtspr(SPRN_TBWL, lower); | |
143 | } | |
144 | ||
145 | /* Accessor functions for the decrementer register. | |
146 | * The 4xx doesn't even have a decrementer. I tried to use the | |
147 | * generic timer interrupt code, which seems OK, with the 4xx PIT | |
148 | * in auto-reload mode. The problem is PIT stops counting when it | |
149 | * hits zero. If it would wrap, we could use it just like a decrementer. | |
150 | */ | |
151 | static inline unsigned int get_dec(void) | |
152 | { | |
153 | #if defined(CONFIG_40x) | |
154 | return (mfspr(SPRN_PIT)); | |
155 | #else | |
156 | return (mfspr(SPRN_DEC)); | |
157 | #endif | |
158 | } | |
159 | ||
43875cc0 PM |
160 | /* |
161 | * Note: Book E and 4xx processors differ from other PowerPC processors | |
162 | * in when the decrementer generates its interrupt: on the 1 to 0 | |
163 | * transition for Book E/4xx, but on the 0 to -1 transition for others. | |
164 | */ | |
f2783c15 PM |
165 | static inline void set_dec(int val) |
166 | { | |
167 | #if defined(CONFIG_40x) | |
aab69292 | 168 | mtspr(SPRN_PIT, val); |
f2783c15 | 169 | #elif defined(CONFIG_8xx_CPU6) |
43875cc0 | 170 | set_dec_cpu6(val - 1); |
f2783c15 | 171 | #else |
43875cc0 PM |
172 | #ifndef CONFIG_BOOKE |
173 | --val; | |
174 | #endif | |
f2783c15 | 175 | #ifdef CONFIG_PPC_ISERIES |
9b47569a SR |
176 | if (firmware_has_feature(FW_FEATURE_ISERIES) && |
177 | get_lppaca()->shared_proc) { | |
3356bb9f | 178 | get_lppaca()->virtual_decr = val; |
43875cc0 | 179 | if (get_dec() > val) |
f2783c15 | 180 | HvCall_setVirtualDecr(); |
43875cc0 PM |
181 | return; |
182 | } | |
f2783c15 | 183 | #endif |
43875cc0 | 184 | mtspr(SPRN_DEC, val); |
f2783c15 PM |
185 | #endif /* not 40x or 8xx_CPU6 */ |
186 | } | |
187 | ||
188 | static inline unsigned long tb_ticks_since(unsigned long tstamp) | |
189 | { | |
190 | if (__USE_RTC()) { | |
191 | int delta = get_rtcl() - (unsigned int) tstamp; | |
192 | return delta < 0 ? delta + 1000000000 : delta; | |
193 | } | |
194 | return get_tbl() - tstamp; | |
195 | } | |
196 | ||
197 | #define mulhwu(x,y) \ | |
198 | ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) | |
199 | ||
200 | #ifdef CONFIG_PPC64 | |
201 | #define mulhdu(x,y) \ | |
202 | ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) | |
203 | #else | |
204 | extern u64 mulhdu(u64, u64); | |
205 | #endif | |
206 | ||
a5b518ed PM |
207 | extern void smp_space_timers(unsigned int); |
208 | ||
209 | extern unsigned mulhwu_scale_factor(unsigned, unsigned); | |
210 | extern void div128_by_32(u64 dividend_high, u64 dividend_low, | |
211 | unsigned divisor, struct div_result *dr); | |
f2783c15 PM |
212 | |
213 | /* Used to store Processor Utilization register (purr) values */ | |
214 | ||
215 | struct cpu_usage { | |
216 | u64 current_tb; /* Holds the current purr register values */ | |
217 | }; | |
218 | ||
219 | DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array); | |
220 | ||
4cefebb1 | 221 | #if defined(CONFIG_VIRT_CPU_ACCOUNTING) |
c6622f63 PM |
222 | extern void calculate_steal_time(void); |
223 | extern void snapshot_timebases(void); | |
81a3843f | 224 | #define account_process_vtime(tsk) account_process_tick(tsk, 0) |
c6622f63 PM |
225 | #else |
226 | #define calculate_steal_time() do { } while (0) | |
227 | #define snapshot_timebases() do { } while (0) | |
81a3843f | 228 | #define account_process_vtime(tsk) do { } while (0) |
c6622f63 PM |
229 | #endif |
230 | ||
d831d0b8 | 231 | extern void secondary_cpu_time_init(void); |
71712b45 TB |
232 | extern void iSeries_time_init_early(void); |
233 | ||
f2783c15 | 234 | #endif /* __KERNEL__ */ |
7a69af63 | 235 | #endif /* __POWERPC_TIME_H */ |