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 #include <asm/cpu_has_feature.h>
22
23 /* time.c */
24 extern unsigned long tb_ticks_per_jiffy;
25 extern unsigned long tb_ticks_per_usec;
26 extern unsigned long tb_ticks_per_sec;
27 extern struct clock_event_device decrementer_clockevent;
28
29
30 extern void generic_calibrate_decr(void);
31 extern void hdec_interrupt(struct pt_regs *regs);
32
33 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
34 extern unsigned long ppc_proc_freq;
35 #define DEFAULT_PROC_FREQ (DEFAULT_TB_FREQ * 8)
36 extern unsigned long ppc_tb_freq;
37 #define DEFAULT_TB_FREQ 125000000UL
38
39 struct div_result {
40 u64 result_high;
41 u64 result_low;
42 };
43
44 /* Accessor functions for the timebase (RTC on 601) registers. */
45 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
46 #ifdef CONFIG_6xx
47 #define __USE_RTC() (cpu_has_feature(CPU_FTR_USE_RTC))
48 #else
49 #define __USE_RTC() 0
50 #endif
51
52 #ifdef CONFIG_PPC64
53
54 /* For compatibility, get_tbl() is defined as get_tb() on ppc64 */
55 #define get_tbl get_tb
56
57 #else
58
get_tbl(void)59 static inline unsigned long get_tbl(void)
60 {
61 #if defined(CONFIG_403GCX)
62 unsigned long tbl;
63 asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
64 return tbl;
65 #else
66 return mftbl();
67 #endif
68 }
69
get_tbu(void)70 static inline unsigned int get_tbu(void)
71 {
72 #ifdef CONFIG_403GCX
73 unsigned int tbu;
74 asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
75 return tbu;
76 #else
77 return mftbu();
78 #endif
79 }
80 #endif /* !CONFIG_PPC64 */
81
get_rtcl(void)82 static inline unsigned int get_rtcl(void)
83 {
84 unsigned int rtcl;
85
86 asm volatile("mfrtcl %0" : "=r" (rtcl));
87 return rtcl;
88 }
89
get_rtc(void)90 static inline u64 get_rtc(void)
91 {
92 unsigned int hi, lo, hi2;
93
94 do {
95 asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
96 : "=r" (hi), "=r" (lo), "=r" (hi2));
97 } while (hi2 != hi);
98 return (u64)hi * 1000000000 + lo;
99 }
100
get_vtb(void)101 static inline u64 get_vtb(void)
102 {
103 #ifdef CONFIG_PPC_BOOK3S_64
104 if (cpu_has_feature(CPU_FTR_ARCH_207S))
105 return mfspr(SPRN_VTB);
106 #endif
107 return 0;
108 }
109
110 #ifdef CONFIG_PPC64
get_tb(void)111 static inline u64 get_tb(void)
112 {
113 return mftb();
114 }
115 #else /* CONFIG_PPC64 */
get_tb(void)116 static inline u64 get_tb(void)
117 {
118 unsigned int tbhi, tblo, tbhi2;
119
120 do {
121 tbhi = get_tbu();
122 tblo = get_tbl();
123 tbhi2 = get_tbu();
124 } while (tbhi != tbhi2);
125
126 return ((u64)tbhi << 32) | tblo;
127 }
128 #endif /* !CONFIG_PPC64 */
129
get_tb_or_rtc(void)130 static inline u64 get_tb_or_rtc(void)
131 {
132 return __USE_RTC() ? get_rtc() : get_tb();
133 }
134
set_tb(unsigned int upper,unsigned int lower)135 static inline void set_tb(unsigned int upper, unsigned int lower)
136 {
137 mtspr(SPRN_TBWL, 0);
138 mtspr(SPRN_TBWU, upper);
139 mtspr(SPRN_TBWL, lower);
140 }
141
142 /* Accessor functions for the decrementer register.
143 * The 4xx doesn't even have a decrementer. I tried to use the
144 * generic timer interrupt code, which seems OK, with the 4xx PIT
145 * in auto-reload mode. The problem is PIT stops counting when it
146 * hits zero. If it would wrap, we could use it just like a decrementer.
147 */
get_dec(void)148 static inline u64 get_dec(void)
149 {
150 #if defined(CONFIG_40x)
151 return (mfspr(SPRN_PIT));
152 #else
153 return (mfspr(SPRN_DEC));
154 #endif
155 }
156
157 /*
158 * Note: Book E and 4xx processors differ from other PowerPC processors
159 * in when the decrementer generates its interrupt: on the 1 to 0
160 * transition for Book E/4xx, but on the 0 to -1 transition for others.
161 */
set_dec(u64 val)162 static inline void set_dec(u64 val)
163 {
164 #if defined(CONFIG_40x)
165 mtspr(SPRN_PIT, (u32) val);
166 #else
167 #ifndef CONFIG_BOOKE
168 --val;
169 #endif
170 mtspr(SPRN_DEC, val);
171 #endif /* not 40x */
172 }
173
tb_ticks_since(unsigned long tstamp)174 static inline unsigned long tb_ticks_since(unsigned long tstamp)
175 {
176 if (__USE_RTC()) {
177 int delta = get_rtcl() - (unsigned int) tstamp;
178 return delta < 0 ? delta + 1000000000 : delta;
179 }
180 return get_tbl() - tstamp;
181 }
182
183 #define mulhwu(x,y) \
184 ({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
185
186 #ifdef CONFIG_PPC64
187 #define mulhdu(x,y) \
188 ({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
189 #else
190 extern u64 mulhdu(u64, u64);
191 #endif
192
193 extern void div128_by_32(u64 dividend_high, u64 dividend_low,
194 unsigned divisor, struct div_result *dr);
195
196 extern void secondary_cpu_time_init(void);
197 extern void __init time_init(void);
198
199 DECLARE_PER_CPU(u64, decrementers_next_tb);
200
201 /* Convert timebase ticks to nanoseconds */
202 unsigned long long tb_to_ns(unsigned long long tb_ticks);
203
204 #endif /* __KERNEL__ */
205 #endif /* __POWERPC_TIME_H */
206
