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
|
/***************************************************************************/
/*
* linux/arch/m68knommu/platform/68328/timers.c
*
* Copyright (C) 1993 Hamish Macdonald
* Copyright (C) 1999 D. Jeff Dionne
* Copyright (C) 2001 Georges Menie, Ken Desmet
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*/
/***************************************************************************/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <asm/setup.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/irq.h>
#include <asm/machdep.h>
#include <asm/MC68VZ328.h>
/***************************************************************************/
#if defined(CONFIG_DRAGEN2)
/* with a 33.16 MHz clock, this will give usec resolution to the time functions */
#define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK
#define CLOCK_PRE 7
#define TICKS_PER_JIFFY 41450
#elif defined(CONFIG_XCOPILOT_BUGS)
/*
* The only thing I know is that CLK32 is not available on Xcopilot
* I have little idea about what frequency SYSCLK has on Xcopilot.
* The values for prescaler and compare registers were simply
* taken from the original source
*/
#define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK
#define CLOCK_PRE 2
#define TICKS_PER_JIFFY 0xd7e4
#else
/* default to using the 32Khz clock */
#define CLOCK_SOURCE TCTL_CLKSOURCE_32KHZ
#define CLOCK_PRE 31
#define TICKS_PER_JIFFY 10
#endif
/***************************************************************************/
void m68328_timer_init(irqreturn_t (*timer_routine) (int, void *, struct pt_regs *))
{
/* disable timer 1 */
TCTL = 0;
/* set ISR */
if (request_irq(TMR_IRQ_NUM, timer_routine, IRQ_FLG_LOCK, "timer", NULL))
panic("Unable to attach timer interrupt\n");
/* Restart mode, Enable int, Set clock source */
TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE;
TPRER = CLOCK_PRE;
TCMP = TICKS_PER_JIFFY;
/* Enable timer 1 */
TCTL |= TCTL_TEN;
}
/***************************************************************************/
void m68328_timer_tick(void)
{
/* Reset Timer1 */
TSTAT &= 0;
}
/***************************************************************************/
unsigned long m68328_timer_gettimeoffset(void)
{
unsigned long ticks = TCN, offset = 0;
/* check for pending interrupt */
if (ticks < (TICKS_PER_JIFFY >> 1) && (ISR & (1 << TMR_IRQ_NUM)))
offset = 1000000 / HZ;
ticks = (ticks * 1000000 / HZ) / TICKS_PER_JIFFY;
return ticks + offset;
}
/***************************************************************************/
void m68328_timer_gettod(int *year, int *mon, int *day, int *hour, int *min, int *sec)
{
long now = RTCTIME;
*year = *mon = *day = 1;
*hour = (now >> 24) % 24;
*min = (now >> 16) % 60;
*sec = now % 60;
}
/***************************************************************************/
|
