blob: 0860186eedb24b0789321e1800e117e34467f7cf (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/* ASB2305 timer specifcations
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#ifndef _ASM_UNIT_TIMEX_H
#define _ASM_UNIT_TIMEX_H
#ifndef __ASSEMBLY__
#include <linux/irq.h>
#endif /* __ASSEMBLY__ */
#include <asm/timer-regs.h>
#include <unit/clock.h>
/*
* jiffies counter specifications
*/
#define TMJCBR_MAX 0xffff
#define TMJCBC TM01BC
#define TMJCMD TM01MD
#define TMJCBR TM01BR
#define TMJCIRQ TM1IRQ
#define TMJCICR TM1ICR
#define TMJCICR_LEVEL GxICR_LEVEL_5
#ifndef __ASSEMBLY__
static inline void startup_jiffies_counter(void)
{
unsigned rate;
u16 md, t16;
/* use as little prescaling as possible to avoid losing accuracy */
md = TM0MD_SRC_IOCLK;
rate = MN10300_JCCLK / HZ;
if (rate > TMJCBR_MAX) {
md = TM0MD_SRC_IOCLK_8;
rate = MN10300_JCCLK / 8 / HZ;
if (rate > TMJCBR_MAX) {
md = TM0MD_SRC_IOCLK_32;
rate = MN10300_JCCLK / 32 / HZ;
BUG_ON(rate > TMJCBR_MAX);
}
}
TMJCBR = rate - 1;
t16 = TMJCBR;
TMJCMD =
md |
TM1MD_SRC_TM0CASCADE << 8 |
TM0MD_INIT_COUNTER |
TM1MD_INIT_COUNTER << 8;
TMJCMD =
md |
TM1MD_SRC_TM0CASCADE << 8 |
TM0MD_COUNT_ENABLE |
TM1MD_COUNT_ENABLE << 8;
t16 = TMJCMD;
TMJCICR |= GxICR_ENABLE | GxICR_DETECT | GxICR_REQUEST;
t16 = TMJCICR;
}
static inline void shutdown_jiffies_counter(void)
{
}
#endif /* !__ASSEMBLY__ */
/*
* timestamp counter specifications
*/
#define TMTSCBR_MAX 0xffffffff
#define TMTSCBC TM45BC
#ifndef __ASSEMBLY__
static inline void startup_timestamp_counter(void)
{
/* set up timer 4 & 5 cascaded as a 32-bit counter to count real time
* - count down from 4Gig-1 to 0 and wrap at IOCLK rate
*/
TM45BR = TMTSCBR_MAX;
TM4MD = TM4MD_SRC_IOCLK;
TM4MD |= TM4MD_INIT_COUNTER;
TM4MD &= ~TM4MD_INIT_COUNTER;
TM4ICR = 0;
TM5MD = TM5MD_SRC_TM4CASCADE;
TM5MD |= TM5MD_INIT_COUNTER;
TM5MD &= ~TM5MD_INIT_COUNTER;
TM5ICR = 0;
TM5MD |= TM5MD_COUNT_ENABLE;
TM4MD |= TM4MD_COUNT_ENABLE;
}
static inline void shutdown_timestamp_counter(void)
{
TM4MD = 0;
TM5MD = 0;
}
/*
* we use a cascaded pair of 16-bit down-counting timers to count I/O
* clock cycles for the purposes of time keeping
*/
typedef unsigned long cycles_t;
static inline cycles_t read_timestamp_counter(void)
{
return (cycles_t) TMTSCBC;
}
#endif /* !__ASSEMBLY__ */
#endif /* _ASM_UNIT_TIMEX_H */
|
