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/types.h>
18 #include <linux/percpu.h>
19
20 #include <asm/processor.h>
21 #ifdef CONFIG_PPC_ISERIES
22 #include <asm/paca.h>
23 #include <asm/firmware.h>
24 #include <asm/iseries/hv_call.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
34 struct rtc_time;
35 extern void to_tm(int tim, struct rtc_time * tm);
36 extern void GregorianDay(struct rtc_time *tm);
37 extern time_t last_rtc_update;
38
39 extern void generic_calibrate_decr(void);
40 extern void wakeup_decrementer(void);
41 extern void snapshot_timebase(void);
42
43 extern void set_dec_cpu6(unsigned int val);
44
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 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
59 #define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB))
60 #else
61 #define __USE_RTC() 0
62 #endif
63
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
get_tbl(void)71 static inline unsigned long get_tbl(void)
72 {
73 #if defined(CONFIG_403GCX)
74 unsigned long tbl;
75 asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
76 return tbl;
77 #else
78 return mftbl();
79 #endif
80 }
81
get_tbu(void)82 static inline unsigned int get_tbu(void)
83 {
84 #ifdef CONFIG_403GCX
85 unsigned int tbu;
86 asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
87 return tbu;
88 #else
89 return mftbu();
90 #endif
91 }
92 #endif /* !CONFIG_PPC64 */
93
get_rtcl(void)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
get_rtc(void)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
113 #ifdef CONFIG_PPC64
get_tb(void)114 static inline u64 get_tb(void)
115 {
116 return mftb();
117 }
118 #else /* CONFIG_PPC64 */
get_tb(void)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 }
131 #endif /* !CONFIG_PPC64 */
132
get_tb_or_rtc(void)133 static inline u64 get_tb_or_rtc(void)
134 {
135 return __USE_RTC() ? get_rtc() : get_tb();
136 }
137
set_tb(unsigned int upper,unsigned int lower)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 */
get_dec(void)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
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 */
set_dec(int val)165 static inline void set_dec(int val)
166 {
167 #if defined(CONFIG_40x)
168 mtspr(SPRN_PIT, val);
169 #elif defined(CONFIG_8xx_CPU6)
170 set_dec_cpu6(val - 1);
171 #else
172 #ifndef CONFIG_BOOKE
173 --val;
174 #endif
175 #ifdef CONFIG_PPC_ISERIES
176 if (firmware_has_feature(FW_FEATURE_ISERIES) &&
177 get_lppaca()->shared_proc) {
178 get_lppaca()->virtual_decr = val;
179 if (get_dec() > val)
180 HvCall_setVirtualDecr();
181 return;
182 }
183 #endif
184 mtspr(SPRN_DEC, val);
185 #endif /* not 40x or 8xx_CPU6 */
186 }
187
tb_ticks_since(unsigned long tstamp)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
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);
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
221 #if defined(CONFIG_VIRT_CPU_ACCOUNTING)
222 extern void calculate_steal_time(void);
223 extern void snapshot_timebases(void);
224 #define account_process_vtime(tsk) account_process_tick(tsk, 0)
225 #else
226 #define calculate_steal_time() do { } while (0)
227 #define snapshot_timebases() do { } while (0)
228 #define account_process_vtime(tsk) do { } while (0)
229 #endif
230
231 extern void secondary_cpu_time_init(void);
232 extern void iSeries_time_init_early(void);
233
234 #endif /* __KERNEL__ */
235 #endif /* __POWERPC_TIME_H */
236