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 */
23extern unsigned long tb_ticks_per_jiffy;
24extern unsigned long tb_ticks_per_usec;
25extern unsigned long tb_ticks_per_sec;
26
27struct rtc_time;
28extern void to_tm(int tim, struct rtc_time * tm);
29extern void GregorianDay(struct rtc_time *tm);
30
31extern void generic_calibrate_decr(void);
32
33extern void set_dec_cpu6(unsigned int val);
34
35/* Some sane defaults: 125 MHz timebase, 1GHz processor */
36extern unsigned long ppc_proc_freq;
37#define DEFAULT_PROC_FREQ	(DEFAULT_TB_FREQ * 8)
38extern unsigned long ppc_tb_freq;
39#define DEFAULT_TB_FREQ		125000000UL
40
41struct div_result {
42	u64 result_high;
43	u64 result_low;
44};
45
46/* Accessor functions for the timebase (RTC on 601) registers. */
47/* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
48#ifdef CONFIG_6xx
49#define __USE_RTC()	(!cpu_has_feature(CPU_FTR_USE_TB))
50#else
51#define __USE_RTC()	0
52#endif
53
54#ifdef CONFIG_PPC64
55
56/* For compatibility, get_tbl() is defined as get_tb() on ppc64 */
57#define get_tbl		get_tb
58
59#else
60
61static inline unsigned long get_tbl(void)
62{
63#if defined(CONFIG_403GCX)
64	unsigned long tbl;
65	asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
66	return tbl;
67#else
68	return mftbl();
69#endif
70}
71
72static inline unsigned int get_tbu(void)
73{
74#ifdef CONFIG_403GCX
75	unsigned int tbu;
76	asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
77	return tbu;
78#else
79	return mftbu();
80#endif
81}
82#endif /* !CONFIG_PPC64 */
83
84static inline unsigned int get_rtcl(void)
85{
86	unsigned int rtcl;
87
88	asm volatile("mfrtcl %0" : "=r" (rtcl));
89	return rtcl;
90}
91
92static inline u64 get_rtc(void)
93{
94	unsigned int hi, lo, hi2;
95
96	do {
97		asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
98			     : "=r" (hi), "=r" (lo), "=r" (hi2));
99	} while (hi2 != hi);
100	return (u64)hi * 1000000000 + lo;
101}
102
103#ifdef CONFIG_PPC64
104static inline u64 get_tb(void)
105{
106	return mftb();
107}
108#else /* CONFIG_PPC64 */
109static inline u64 get_tb(void)
110{
111	unsigned int tbhi, tblo, tbhi2;
112
113	do {
114		tbhi = get_tbu();
115		tblo = get_tbl();
116		tbhi2 = get_tbu();
117	} while (tbhi != tbhi2);
118
119	return ((u64)tbhi << 32) | tblo;
120}
121#endif /* !CONFIG_PPC64 */
122
123static inline u64 get_tb_or_rtc(void)
124{
125	return __USE_RTC() ? get_rtc() : get_tb();
126}
127
128static inline void set_tb(unsigned int upper, unsigned int lower)
129{
130	mtspr(SPRN_TBWL, 0);
131	mtspr(SPRN_TBWU, upper);
132	mtspr(SPRN_TBWL, lower);
133}
134
135/* Accessor functions for the decrementer register.
136 * The 4xx doesn't even have a decrementer.  I tried to use the
137 * generic timer interrupt code, which seems OK, with the 4xx PIT
138 * in auto-reload mode.  The problem is PIT stops counting when it
139 * hits zero.  If it would wrap, we could use it just like a decrementer.
140 */
141static inline unsigned int get_dec(void)
142{
143#if defined(CONFIG_40x)
144	return (mfspr(SPRN_PIT));
145#else
146	return (mfspr(SPRN_DEC));
147#endif
148}
149
150/*
151 * Note: Book E and 4xx processors differ from other PowerPC processors
152 * in when the decrementer generates its interrupt: on the 1 to 0
153 * transition for Book E/4xx, but on the 0 to -1 transition for others.
154 */
155static inline void set_dec(int val)
156{
157#if defined(CONFIG_40x)
158	mtspr(SPRN_PIT, val);
159#elif defined(CONFIG_8xx_CPU6)
160	set_dec_cpu6(val - 1);
161#else
162#ifndef CONFIG_BOOKE
163	--val;
164#endif
165	mtspr(SPRN_DEC, val);
166#endif /* not 40x or 8xx_CPU6 */
167}
168
169static inline unsigned long tb_ticks_since(unsigned long tstamp)
170{
171	if (__USE_RTC()) {
172		int delta = get_rtcl() - (unsigned int) tstamp;
173		return delta < 0 ? delta + 1000000000 : delta;
174	}
175	return get_tbl() - tstamp;
176}
177
178#define mulhwu(x,y) \
179({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
180
181#ifdef CONFIG_PPC64
182#define mulhdu(x,y) \
183({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
184#else
185extern u64 mulhdu(u64, u64);
186#endif
187
188extern void div128_by_32(u64 dividend_high, u64 dividend_low,
189			 unsigned divisor, struct div_result *dr);
190
191/* Used to store Processor Utilization register (purr) values */
192
193struct cpu_usage {
194        u64 current_tb;  /* Holds the current purr register values */
195};
196
197DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
198
199#if defined(CONFIG_VIRT_CPU_ACCOUNTING)
200#define account_process_vtime(tsk)		account_process_tick(tsk, 0)
201#else
202#define account_process_vtime(tsk)		do { } while (0)
203#endif
204
205extern void secondary_cpu_time_init(void);
206
207DECLARE_PER_CPU(u64, decrementers_next_tb);
208
209#endif /* __KERNEL__ */
210#endif /* __POWERPC_TIME_H */
211