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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> | |
f2783c15 PM |
21 | |
22 | /* time.c */ | |
23 | extern unsigned long tb_ticks_per_jiffy; | |
24 | extern unsigned long tb_ticks_per_usec; | |
25 | extern unsigned long tb_ticks_per_sec; | |
6e35994d | 26 | extern struct clock_event_device decrementer_clockevent; |
f2783c15 PM |
27 | |
28 | struct rtc_time; | |
29 | extern void to_tm(int tim, struct rtc_time * tm); | |
1c21a293 | 30 | extern void GregorianDay(struct rtc_time *tm); |
f2783c15 PM |
31 | |
32 | extern void generic_calibrate_decr(void); | |
f2783c15 | 33 | |
f2a0bd37 VB |
34 | extern void set_dec_cpu6(unsigned int val); |
35 | ||
f2783c15 PM |
36 | /* Some sane defaults: 125 MHz timebase, 1GHz processor */ |
37 | extern unsigned long ppc_proc_freq; | |
38 | #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8) | |
39 | extern unsigned long ppc_tb_freq; | |
40 | #define DEFAULT_TB_FREQ 125000000UL | |
41 | ||
f2783c15 PM |
42 | struct div_result { |
43 | u64 result_high; | |
44 | u64 result_low; | |
45 | }; | |
46 | ||
47 | /* Accessor functions for the timebase (RTC on 601) registers. */ | |
48 | /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */ | |
49 | #ifdef CONFIG_6xx | |
5d14a18d | 50 | #define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB)) |
f2783c15 PM |
51 | #else |
52 | #define __USE_RTC() 0 | |
53 | #endif | |
54 | ||
859deea9 BH |
55 | #ifdef CONFIG_PPC64 |
56 | ||
57 | /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */ | |
58 | #define get_tbl get_tb | |
59 | ||
60 | #else | |
61 | ||
f2783c15 PM |
62 | static inline unsigned long get_tbl(void) |
63 | { | |
f2783c15 | 64 | #if defined(CONFIG_403GCX) |
859deea9 | 65 | unsigned long tbl; |
f2783c15 | 66 | asm volatile("mfspr %0, 0x3dd" : "=r" (tbl)); |
859deea9 | 67 | return tbl; |
f2783c15 | 68 | #else |
859deea9 | 69 | return mftbl(); |
f2783c15 | 70 | #endif |
f2783c15 PM |
71 | } |
72 | ||
73 | static inline unsigned int get_tbu(void) | |
74 | { | |
859deea9 | 75 | #ifdef CONFIG_403GCX |
f2783c15 | 76 | unsigned int tbu; |
f2783c15 | 77 | asm volatile("mfspr %0, 0x3dc" : "=r" (tbu)); |
859deea9 | 78 | return tbu; |
f2783c15 | 79 | #else |
859deea9 | 80 | return mftbu(); |
f2783c15 | 81 | #endif |
f2783c15 | 82 | } |
859deea9 | 83 | #endif /* !CONFIG_PPC64 */ |
f2783c15 PM |
84 | |
85 | static inline unsigned int get_rtcl(void) | |
86 | { | |
87 | unsigned int rtcl; | |
88 | ||
89 | asm volatile("mfrtcl %0" : "=r" (rtcl)); | |
90 | return rtcl; | |
91 | } | |
92 | ||
96c44507 PM |
93 | static inline u64 get_rtc(void) |
94 | { | |
95 | unsigned int hi, lo, hi2; | |
96 | ||
97 | do { | |
98 | asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2" | |
99 | : "=r" (hi), "=r" (lo), "=r" (hi2)); | |
100 | } while (hi2 != hi); | |
101 | return (u64)hi * 1000000000 + lo; | |
102 | } | |
103 | ||
f2783c15 PM |
104 | #ifdef CONFIG_PPC64 |
105 | static inline u64 get_tb(void) | |
106 | { | |
107 | return mftb(); | |
108 | } | |
859deea9 | 109 | #else /* CONFIG_PPC64 */ |
f2783c15 PM |
110 | static inline u64 get_tb(void) |
111 | { | |
112 | unsigned int tbhi, tblo, tbhi2; | |
113 | ||
114 | do { | |
115 | tbhi = get_tbu(); | |
116 | tblo = get_tbl(); | |
117 | tbhi2 = get_tbu(); | |
118 | } while (tbhi != tbhi2); | |
119 | ||
120 | return ((u64)tbhi << 32) | tblo; | |
121 | } | |
859deea9 | 122 | #endif /* !CONFIG_PPC64 */ |
f2783c15 | 123 | |
c27da339 BH |
124 | static inline u64 get_tb_or_rtc(void) |
125 | { | |
126 | return __USE_RTC() ? get_rtc() : get_tb(); | |
127 | } | |
128 | ||
f2783c15 PM |
129 | static inline void set_tb(unsigned int upper, unsigned int lower) |
130 | { | |
131 | mtspr(SPRN_TBWL, 0); | |
132 | mtspr(SPRN_TBWU, upper); | |
133 | mtspr(SPRN_TBWL, lower); | |
134 | } | |
135 | ||
136 | /* Accessor functions for the decrementer register. | |
137 | * The 4xx doesn't even have a decrementer. I tried to use the | |
138 | * generic timer interrupt code, which seems OK, with the 4xx PIT | |
139 | * in auto-reload mode. The problem is PIT stops counting when it | |
140 | * hits zero. If it would wrap, we could use it just like a decrementer. | |
141 | */ | |
142 | static inline unsigned int get_dec(void) | |
143 | { | |
144 | #if defined(CONFIG_40x) | |
145 | return (mfspr(SPRN_PIT)); | |
146 | #else | |
147 | return (mfspr(SPRN_DEC)); | |
148 | #endif | |
149 | } | |
150 | ||
43875cc0 PM |
151 | /* |
152 | * Note: Book E and 4xx processors differ from other PowerPC processors | |
153 | * in when the decrementer generates its interrupt: on the 1 to 0 | |
154 | * transition for Book E/4xx, but on the 0 to -1 transition for others. | |
155 | */ | |
f2783c15 PM |
156 | static inline void set_dec(int val) |
157 | { | |
158 | #if defined(CONFIG_40x) | |
aab69292 | 159 | mtspr(SPRN_PIT, val); |
f2783c15 | 160 | #elif defined(CONFIG_8xx_CPU6) |
43875cc0 | 161 | set_dec_cpu6(val - 1); |
f2783c15 | 162 | #else |
43875cc0 PM |
163 | #ifndef CONFIG_BOOKE |
164 | --val; | |
f2783c15 | 165 | #endif |
43875cc0 | 166 | mtspr(SPRN_DEC, val); |
f2783c15 PM |
167 | #endif /* not 40x or 8xx_CPU6 */ |
168 | } | |
169 | ||
170 | static inline unsigned long tb_ticks_since(unsigned long tstamp) | |
171 | { | |
172 | if (__USE_RTC()) { | |
173 | int delta = get_rtcl() - (unsigned int) tstamp; | |
174 | return delta < 0 ? delta + 1000000000 : delta; | |
175 | } | |
176 | return get_tbl() - tstamp; | |
177 | } | |
178 | ||
179 | #define mulhwu(x,y) \ | |
180 | ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) | |
181 | ||
182 | #ifdef CONFIG_PPC64 | |
183 | #define mulhdu(x,y) \ | |
184 | ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) | |
185 | #else | |
186 | extern u64 mulhdu(u64, u64); | |
187 | #endif | |
188 | ||
a5b518ed PM |
189 | extern void div128_by_32(u64 dividend_high, u64 dividend_low, |
190 | unsigned divisor, struct div_result *dr); | |
f2783c15 PM |
191 | |
192 | /* Used to store Processor Utilization register (purr) values */ | |
193 | ||
194 | struct cpu_usage { | |
195 | u64 current_tb; /* Holds the current purr register values */ | |
196 | }; | |
197 | ||
198 | DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array); | |
199 | ||
d831d0b8 | 200 | extern void secondary_cpu_time_init(void); |
71712b45 | 201 | |
7df10275 | 202 | DECLARE_PER_CPU(u64, decrementers_next_tb); |
37fb9a02 | 203 | |
f2783c15 | 204 | #endif /* __KERNEL__ */ |
7a69af63 | 205 | #endif /* __POWERPC_TIME_H */ |