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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> | |
24 | #include <asm/iSeries/HvCall.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 | extern u64 tb_last_stamp; | |
34 | ||
35 | DECLARE_PER_CPU(unsigned long, last_jiffy); | |
36 | ||
37 | struct rtc_time; | |
38 | extern void to_tm(int tim, struct rtc_time * tm); | |
39 | extern time_t last_rtc_update; | |
40 | ||
41 | extern void generic_calibrate_decr(void); | |
42 | extern void wakeup_decrementer(void); | |
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 | |
5d14a18d | 78 | #define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB)) |
f2783c15 PM |
79 | #else |
80 | #define __USE_RTC() 0 | |
81 | #endif | |
82 | ||
83 | /* On ppc64 this gets us the whole timebase; on ppc32 just the lower half */ | |
84 | static inline unsigned long get_tbl(void) | |
85 | { | |
86 | unsigned long tbl; | |
87 | ||
88 | #if defined(CONFIG_403GCX) | |
89 | asm volatile("mfspr %0, 0x3dd" : "=r" (tbl)); | |
90 | #else | |
91 | asm volatile("mftb %0" : "=r" (tbl)); | |
92 | #endif | |
93 | return tbl; | |
94 | } | |
95 | ||
96 | static inline unsigned int get_tbu(void) | |
97 | { | |
98 | unsigned int tbu; | |
99 | ||
100 | #if defined(CONFIG_403GCX) | |
101 | asm volatile("mfspr %0, 0x3dc" : "=r" (tbu)); | |
102 | #else | |
103 | asm volatile("mftbu %0" : "=r" (tbu)); | |
104 | #endif | |
105 | return tbu; | |
106 | } | |
107 | ||
108 | static inline unsigned int get_rtcl(void) | |
109 | { | |
110 | unsigned int rtcl; | |
111 | ||
112 | asm volatile("mfrtcl %0" : "=r" (rtcl)); | |
113 | return rtcl; | |
114 | } | |
115 | ||
116 | #ifdef CONFIG_PPC64 | |
117 | static inline u64 get_tb(void) | |
118 | { | |
119 | return mftb(); | |
120 | } | |
121 | #else | |
122 | static inline u64 get_tb(void) | |
123 | { | |
124 | unsigned int tbhi, tblo, tbhi2; | |
125 | ||
126 | do { | |
127 | tbhi = get_tbu(); | |
128 | tblo = get_tbl(); | |
129 | tbhi2 = get_tbu(); | |
130 | } while (tbhi != tbhi2); | |
131 | ||
132 | return ((u64)tbhi << 32) | tblo; | |
133 | } | |
134 | #endif | |
135 | ||
136 | static inline void set_tb(unsigned int upper, unsigned int lower) | |
137 | { | |
138 | mtspr(SPRN_TBWL, 0); | |
139 | mtspr(SPRN_TBWU, upper); | |
140 | mtspr(SPRN_TBWL, lower); | |
141 | } | |
142 | ||
143 | /* Accessor functions for the decrementer register. | |
144 | * The 4xx doesn't even have a decrementer. I tried to use the | |
145 | * generic timer interrupt code, which seems OK, with the 4xx PIT | |
146 | * in auto-reload mode. The problem is PIT stops counting when it | |
147 | * hits zero. If it would wrap, we could use it just like a decrementer. | |
148 | */ | |
149 | static inline unsigned int get_dec(void) | |
150 | { | |
151 | #if defined(CONFIG_40x) | |
152 | return (mfspr(SPRN_PIT)); | |
153 | #else | |
154 | return (mfspr(SPRN_DEC)); | |
155 | #endif | |
156 | } | |
157 | ||
158 | static inline void set_dec(int val) | |
159 | { | |
160 | #if defined(CONFIG_40x) | |
161 | return; /* Have to let it auto-reload */ | |
162 | #elif defined(CONFIG_8xx_CPU6) | |
163 | set_dec_cpu6(val); | |
164 | #else | |
165 | #ifdef CONFIG_PPC_ISERIES | |
166 | struct paca_struct *lpaca = get_paca(); | |
167 | int cur_dec; | |
168 | ||
169 | if (lpaca->lppaca.shared_proc) { | |
170 | lpaca->lppaca.virtual_decr = val; | |
171 | cur_dec = get_dec(); | |
172 | if (cur_dec > val) | |
173 | HvCall_setVirtualDecr(); | |
174 | } else | |
175 | #endif | |
176 | mtspr(SPRN_DEC, val); | |
177 | #endif /* not 40x or 8xx_CPU6 */ | |
178 | } | |
179 | ||
180 | static inline unsigned long tb_ticks_since(unsigned long tstamp) | |
181 | { | |
182 | if (__USE_RTC()) { | |
183 | int delta = get_rtcl() - (unsigned int) tstamp; | |
184 | return delta < 0 ? delta + 1000000000 : delta; | |
185 | } | |
186 | return get_tbl() - tstamp; | |
187 | } | |
188 | ||
189 | #define mulhwu(x,y) \ | |
190 | ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) | |
191 | ||
192 | #ifdef CONFIG_PPC64 | |
193 | #define mulhdu(x,y) \ | |
194 | ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;}) | |
195 | #else | |
196 | extern u64 mulhdu(u64, u64); | |
197 | #endif | |
198 | ||
199 | unsigned mulhwu_scale_factor(unsigned, unsigned); | |
200 | void div128_by_32(u64 dividend_high, u64 dividend_low, | |
201 | unsigned divisor, struct div_result *dr); | |
202 | ||
203 | /* Used to store Processor Utilization register (purr) values */ | |
204 | ||
205 | struct cpu_usage { | |
206 | u64 current_tb; /* Holds the current purr register values */ | |
207 | }; | |
208 | ||
209 | DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array); | |
210 | ||
211 | #endif /* __KERNEL__ */ | |
212 | #endif /* __PPC64_TIME_H */ |