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 */
28extern unsigned long tb_ticks_per_jiffy;
29extern unsigned long tb_ticks_per_usec;
30extern unsigned long tb_ticks_per_sec;
31extern u64 tb_to_xs;
32extern unsigned      tb_to_us;
33
34struct rtc_time;
35extern void to_tm(int tim, struct rtc_time * tm);
36extern time_t last_rtc_update;
37
38extern void generic_calibrate_decr(void);
39extern void wakeup_decrementer(void);
40extern void snapshot_timebase(void);
41
42extern void set_dec_cpu6(unsigned int val);
43
44/* Some sane defaults: 125 MHz timebase, 1GHz processor */
45extern unsigned long ppc_proc_freq;
46#define DEFAULT_PROC_FREQ	(DEFAULT_TB_FREQ * 8)
47extern 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 */
56struct gettimeofday_vars {
57	u64 tb_to_xs;
58	u64 stamp_xsec;
59	u64 tb_orig_stamp;
60};
61
62struct 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
70struct 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
78#define __USE_RTC()	(!cpu_has_feature(CPU_FTR_USE_TB))
79#else
80#define __USE_RTC()	0
81#endif
82
83#ifdef CONFIG_PPC64
84
85/* For compatibility, get_tbl() is defined as get_tb() on ppc64 */
86#define get_tbl		get_tb
87
88#else
89
90static inline unsigned long get_tbl(void)
91{
92#if defined(CONFIG_403GCX)
93	unsigned long tbl;
94	asm volatile("mfspr %0, 0x3dd" : "=r" (tbl));
95	return tbl;
96#else
97	return mftbl();
98#endif
99}
100
101static inline unsigned int get_tbu(void)
102{
103#ifdef CONFIG_403GCX
104	unsigned int tbu;
105	asm volatile("mfspr %0, 0x3dc" : "=r" (tbu));
106	return tbu;
107#else
108	return mftbu();
109#endif
110}
111#endif /* !CONFIG_PPC64 */
112
113static inline unsigned int get_rtcl(void)
114{
115	unsigned int rtcl;
116
117	asm volatile("mfrtcl %0" : "=r" (rtcl));
118	return rtcl;
119}
120
121static inline u64 get_rtc(void)
122{
123	unsigned int hi, lo, hi2;
124
125	do {
126		asm volatile("mfrtcu %0; mfrtcl %1; mfrtcu %2"
127			     : "=r" (hi), "=r" (lo), "=r" (hi2));
128	} while (hi2 != hi);
129	return (u64)hi * 1000000000 + lo;
130}
131
132#ifdef CONFIG_PPC64
133static inline u64 get_tb(void)
134{
135	return mftb();
136}
137#else /* CONFIG_PPC64 */
138static inline u64 get_tb(void)
139{
140	unsigned int tbhi, tblo, tbhi2;
141
142	do {
143		tbhi = get_tbu();
144		tblo = get_tbl();
145		tbhi2 = get_tbu();
146	} while (tbhi != tbhi2);
147
148	return ((u64)tbhi << 32) | tblo;
149}
150#endif /* !CONFIG_PPC64 */
151
152static inline void set_tb(unsigned int upper, unsigned int lower)
153{
154	mtspr(SPRN_TBWL, 0);
155	mtspr(SPRN_TBWU, upper);
156	mtspr(SPRN_TBWL, lower);
157}
158
159/* Accessor functions for the decrementer register.
160 * The 4xx doesn't even have a decrementer.  I tried to use the
161 * generic timer interrupt code, which seems OK, with the 4xx PIT
162 * in auto-reload mode.  The problem is PIT stops counting when it
163 * hits zero.  If it would wrap, we could use it just like a decrementer.
164 */
165static inline unsigned int get_dec(void)
166{
167#if defined(CONFIG_40x)
168	return (mfspr(SPRN_PIT));
169#else
170	return (mfspr(SPRN_DEC));
171#endif
172}
173
174static inline void set_dec(int val)
175{
176#if defined(CONFIG_40x)
177	return;		/* Have to let it auto-reload */
178#elif defined(CONFIG_8xx_CPU6)
179	set_dec_cpu6(val);
180#else
181#ifdef CONFIG_PPC_ISERIES
182	int cur_dec;
183
184	if (firmware_has_feature(FW_FEATURE_ISERIES) &&
185			get_lppaca()->shared_proc) {
186		get_lppaca()->virtual_decr = val;
187		cur_dec = get_dec();
188		if (cur_dec > val)
189			HvCall_setVirtualDecr();
190	} else
191#endif
192		mtspr(SPRN_DEC, val);
193#endif /* not 40x or 8xx_CPU6 */
194}
195
196static inline unsigned long tb_ticks_since(unsigned long tstamp)
197{
198	if (__USE_RTC()) {
199		int delta = get_rtcl() - (unsigned int) tstamp;
200		return delta < 0 ? delta + 1000000000 : delta;
201	}
202	return get_tbl() - tstamp;
203}
204
205#define mulhwu(x,y) \
206({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
207
208#ifdef CONFIG_PPC64
209#define mulhdu(x,y) \
210({unsigned long z; asm ("mulhdu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
211#else
212extern u64 mulhdu(u64, u64);
213#endif
214
215extern void smp_space_timers(unsigned int);
216
217extern unsigned mulhwu_scale_factor(unsigned, unsigned);
218extern void div128_by_32(u64 dividend_high, u64 dividend_low,
219			 unsigned divisor, struct div_result *dr);
220
221/* Used to store Processor Utilization register (purr) values */
222
223struct cpu_usage {
224        u64 current_tb;  /* Holds the current purr register values */
225};
226
227DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
228
229#ifdef CONFIG_VIRT_CPU_ACCOUNTING
230extern void account_process_vtime(struct task_struct *tsk);
231#else
232#define account_process_vtime(tsk)		do { } while (0)
233#endif
234
235#if defined(CONFIG_VIRT_CPU_ACCOUNTING) && defined(CONFIG_PPC_SPLPAR)
236extern void calculate_steal_time(void);
237extern void snapshot_timebases(void);
238#else
239#define calculate_steal_time()			do { } while (0)
240#define snapshot_timebases()			do { } while (0)
241#endif
242
243#endif /* __KERNEL__ */
244#endif /* __POWERPC_TIME_H */
245