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
|
/*
* arch/arm/mach-ns9xxx/time.c
*
* Copyright (C) 2006 by Digi International Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*/
#include <linux/jiffies.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/stringify.h>
#include <linux/clocksource.h>
#include <asm/arch-ns9xxx/regs-sys.h>
#include <asm/arch-ns9xxx/clock.h>
#include <asm/arch-ns9xxx/irqs.h>
#include <asm/arch/system.h>
#include "generic.h"
#define TIMERCLOCKSELECT 64
#define TIMER_CLOCKSOURCE 1
static irqreturn_t
ns9xxx_timer_interrupt(int irq, void *dev_id)
{
int timerno = irq - IRQ_TIMER0;
u32 tc;
write_seqlock(&xtime_lock);
timer_tick();
write_sequnlock(&xtime_lock);
/* clear irq */
tc = SYS_TC(timerno);
if (REGGET(tc, SYS_TCx, REN) == SYS_TCx_REN_DIS) {
REGSET(tc, SYS_TCx, TEN, DIS);
SYS_TC(timerno) = tc;
}
REGSET(tc, SYS_TCx, INTC, SET);
SYS_TC(timerno) = tc;
REGSET(tc, SYS_TCx, INTC, UNSET);
SYS_TC(timerno) = tc;
return IRQ_HANDLED;
}
static struct irqaction ns9xxx_timer_irq = {
.name = "NS9xxx Timer Tick",
.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
.handler = ns9xxx_timer_interrupt,
};
static cycle_t ns9xxx_clocksource_read(void)
{
return SYS_TR(TIMER_CLOCKSOURCE);
}
static struct clocksource ns9xxx_clocksource = {
.name = "ns9xxx-timer" __stringify(TIMER_CLOCKSOURCE),
.rating = 300,
.read = ns9xxx_clocksource_read,
.mask = CLOCKSOURCE_MASK(32),
.shift = 20,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static void __init ns9xxx_timer_init(void)
{
int tc;
/* disable timer */
if ((tc = SYS_TC(0)) & SYS_TCx_TEN)
SYS_TC(0) = tc & ~SYS_TCx_TEN;
SYS_TRC(0) = SH_DIV(ns9xxx_cpuclock(), (TIMERCLOCKSELECT * HZ), 0);
REGSET(tc, SYS_TCx, TEN, EN);
REGSET(tc, SYS_TCx, TLCS, DIV64); /* This must match TIMERCLOCKSELECT */
REGSET(tc, SYS_TCx, INTS, EN);
REGSET(tc, SYS_TCx, UDS, DOWN);
REGSET(tc, SYS_TCx, TDBG, STOP);
REGSET(tc, SYS_TCx, TSZ, 32);
REGSET(tc, SYS_TCx, REN, EN);
SYS_TC(0) = tc;
setup_irq(IRQ_TIMER0, &ns9xxx_timer_irq);
tc = SYS_TC(TIMER_CLOCKSOURCE);
if (REGGET(tc, SYS_TCx, TEN)) {
REGSET(tc, SYS_TCx, TEN, DIS);
SYS_TC(TIMER_CLOCKSOURCE) = tc;
}
SYS_TRC(TIMER_CLOCKSOURCE) = 0;
REGSET(tc, SYS_TCx, TEN, EN);
REGSET(tc, SYS_TCx, TDBG, STOP);
REGSET(tc, SYS_TCx, TLCS, CPU);
REGSET(tc, SYS_TCx, TM, IEE);
REGSET(tc, SYS_TCx, INTS, DIS);
REGSET(tc, SYS_TCx, UDS, UP);
REGSET(tc, SYS_TCx, TSZ, 32);
REGSET(tc, SYS_TCx, REN, EN);
SYS_TC(TIMER_CLOCKSOURCE) = tc;
ns9xxx_clocksource.mult = clocksource_hz2mult(ns9xxx_cpuclock(),
ns9xxx_clocksource.shift);
clocksource_register(&ns9xxx_clocksource);
}
struct sys_timer ns9xxx_timer = {
.init = ns9xxx_timer_init,
};
|
