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
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;
26 extern struct clock_event_device decrementer_clockevent;
27
28 struct rtc_time;
29 extern void to_tm(int tim, struct rtc_time * tm);
30 extern void GregorianDay(struct rtc_time *tm);
31 extern void tick_broadcast_ipi_handler(void);
32
33 extern void generic_calibrate_decr(void);
34
35 extern void set_dec_cpu6(unsigned int val);
36
37 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
38 extern unsigned long ppc_proc_freq;
39 #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8)
40 extern unsigned long ppc_tb_freq;
41 #define DEFAULT_TB_FREQ 125000000UL
42
43 struct div_result {
44 u64 result_high;
45 u64 result_low;
46 };
47
48 /* Accessor functions for the timebase (RTC on 601) registers. */
49 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
50 #ifdef CONFIG_6xx
51 #define __USE_RTC() (!cpu_has_feature(CPU_FTR_USE_TB))
52 #else
53 #define __USE_RTC() 0
54 #endif
55
56 #ifdef CONFIG_PPC64
57
58 /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */
59 #define get_tbl get_tb
60
61 #else
62
get_tbl(void)63 static inline unsigned long get_tbl(void)
64 {
65 #if defined(CONFIG_403GCX)
66 unsigned long tbl;
67 asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
68 return tbl;
69 #else
70 return mftbl();
71 #endif
72 }
73
get_tbu(void)74 static inline unsigned int get_tbu(void)
75 {
76 #ifdef CONFIG_403GCX
77 unsigned int tbu;
78 asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
79 return tbu;
80 #else
81 return mftbu();
82 #endif
83 }
84 #endif /* !CONFIG_PPC64 */
85
get_rtcl(void)86 static inline unsigned int get_rtcl(void)
87 {
88 unsigned int rtcl;
89
90 asm volatile("mfrtcl %0" : "=r" (rtcl));
91 return rtcl;
92 }
93
get_rtc(void)94 static inline u64 get_rtc(void)
95 {
96 unsigned int hi, lo, hi2;
97
98 do {
99 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
100 : "=r" (hi), "=r" (lo), "=r" (hi2));
101 } while (hi2 != hi);
102 return (u64)hi * 1000000000 + lo;
103 }
104
get_vtb(void)105 static inline u64 get_vtb(void)
106 {
107 #ifdef CONFIG_PPC_BOOK3S_64
108 if (cpu_has_feature(CPU_FTR_ARCH_207S))
109 return mfvtb();
110 #endif
111 return 0;
112 }
113
114 #ifdef CONFIG_PPC64
get_tb(void)115 static inline u64 get_tb(void)
116 {
117 return mftb();
118 }
119 #else /* CONFIG_PPC64 */
get_tb(void)120 static inline u64 get_tb(void)
121 {
122 unsigned int tbhi, tblo, tbhi2;
123
124 do {
125 tbhi = get_tbu();
126 tblo = get_tbl();
127 tbhi2 = get_tbu();
128 } while (tbhi != tbhi2);
129
130 return ((u64)tbhi << 32) | tblo;
131 }
132 #endif /* !CONFIG_PPC64 */
133
get_tb_or_rtc(void)134 static inline u64 get_tb_or_rtc(void)
135 {
136 return __USE_RTC() ? get_rtc() : get_tb();
137 }
138
set_tb(unsigned int upper,unsigned int lower)139 static inline void set_tb(unsigned int upper, unsigned int lower)
140 {
141 mtspr(SPRN_TBWL, 0);
142 mtspr(SPRN_TBWU, upper);
143 mtspr(SPRN_TBWL, lower);
144 }
145
146 /* Accessor functions for the decrementer register.
147 * The 4xx doesn't even have a decrementer. I tried to use the
148 * generic timer interrupt code, which seems OK, with the 4xx PIT
149 * in auto-reload mode. The problem is PIT stops counting when it
150 * hits zero. If it would wrap, we could use it just like a decrementer.
151 */
get_dec(void)152 static inline unsigned int get_dec(void)
153 {
154 #if defined(CONFIG_40x)
155 return (mfspr(SPRN_PIT));
156 #else
157 return (mfspr(SPRN_DEC));
158 #endif
159 }
160
161 /*
162 * Note: Book E and 4xx processors differ from other PowerPC processors
163 * in when the decrementer generates its interrupt: on the 1 to 0
164 * transition for Book E/4xx, but on the 0 to -1 transition for others.
165 */
set_dec(int val)166 static inline void set_dec(int val)
167 {
168 #if defined(CONFIG_40x)
169 mtspr(SPRN_PIT, val);
170 #elif defined(CONFIG_8xx_CPU6)
171 set_dec_cpu6(val - 1);
172 #else
173 #ifndef CONFIG_BOOKE
174 --val;
175 #endif
176 mtspr(SPRN_DEC, val);
177 #endif /* not 40x or 8xx_CPU6 */
178 }
179
tb_ticks_since(unsigned long tstamp)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 extern void div128_by_32(u64 dividend_high, u64 dividend_low,
200 unsigned divisor, struct div_result *dr);
201
202 /* Used to store Processor Utilization register (purr) values */
203
204 struct cpu_usage {
205 u64 current_tb; /* Holds the current purr register values */
206 };
207
208 DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
209
210 extern void secondary_cpu_time_init(void);
211
212 DECLARE_PER_CPU(u64, decrementers_next_tb);
213
214 #endif /* __KERNEL__ */
215 #endif /* __POWERPC_TIME_H */
216