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  • only in /netgear-WNDR4500v2-V1.0.0.60_1.0.38/src/linux/linux-2.6/arch/m68knommu/platform/68328/
1/***************************************************************************/
2
3/*
4 *  linux/arch/m68knommu/platform/68328/timers.c
5 *
6 *  Copyright (C) 1993 Hamish Macdonald
7 *  Copyright (C) 1999 D. Jeff Dionne
8 *  Copyright (C) 2001 Georges Menie, Ken Desmet
9 *
10 * This file is subject to the terms and conditions of the GNU General Public
11 * License.  See the file COPYING in the main directory of this archive
12 * for more details.
13 */
14
15/***************************************************************************/
16
17#include <linux/types.h>
18#include <linux/kernel.h>
19#include <linux/mm.h>
20#include <linux/interrupt.h>
21#include <asm/setup.h>
22#include <asm/system.h>
23#include <asm/pgtable.h>
24#include <asm/irq.h>
25#include <asm/machdep.h>
26#include <asm/MC68VZ328.h>
27
28/***************************************************************************/
29
30#if defined(CONFIG_DRAGEN2)
31/* with a 33.16 MHz clock, this will give usec resolution to the time functions */
32#define CLOCK_SOURCE	TCTL_CLKSOURCE_SYSCLK
33#define CLOCK_PRE	7
34#define TICKS_PER_JIFFY	41450
35
36#elif defined(CONFIG_XCOPILOT_BUGS)
37/*
38 * The only thing I know is that CLK32 is not available on Xcopilot
39 * I have little idea about what frequency SYSCLK has on Xcopilot.
40 * The values for prescaler and compare registers were simply
41 * taken from the original source
42 */
43#define CLOCK_SOURCE	TCTL_CLKSOURCE_SYSCLK
44#define CLOCK_PRE	2
45#define TICKS_PER_JIFFY	0xd7e4
46
47#else
48/* default to using the 32Khz clock */
49#define CLOCK_SOURCE	TCTL_CLKSOURCE_32KHZ
50#define CLOCK_PRE	31
51#define TICKS_PER_JIFFY	10
52#endif
53
54/***************************************************************************/
55
56void m68328_timer_init(irq_handler_t timer_routine)
57{
58	/* disable timer 1 */
59	TCTL = 0;
60
61	/* set ISR */
62	if (request_irq(TMR_IRQ_NUM, timer_routine, IRQ_FLG_LOCK, "timer", NULL))
63		panic("Unable to attach timer interrupt\n");
64
65	/* Restart mode, Enable int, Set clock source */
66	TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE;
67	TPRER = CLOCK_PRE;
68	TCMP = TICKS_PER_JIFFY;
69
70	/* Enable timer 1 */
71	TCTL |= TCTL_TEN;
72}
73
74/***************************************************************************/
75
76void m68328_timer_tick(void)
77{
78	/* Reset Timer1 */
79	TSTAT &= 0;
80}
81/***************************************************************************/
82
83unsigned long m68328_timer_gettimeoffset(void)
84{
85	unsigned long ticks = TCN, offset = 0;
86
87	/* check for pending interrupt */
88	if (ticks < (TICKS_PER_JIFFY >> 1) && (ISR & (1 << TMR_IRQ_NUM)))
89		offset = 1000000 / HZ;
90	ticks = (ticks * 1000000 / HZ) / TICKS_PER_JIFFY;
91	return ticks + offset;
92}
93
94/***************************************************************************/
95
96void m68328_timer_gettod(int *year, int *mon, int *day, int *hour, int *min, int *sec)
97{
98	long now = RTCTIME;
99
100	*year = *mon = *day = 1;
101	*hour = (now >> 24) % 24;
102	*min = (now >> 16) % 60;
103	*sec = now % 60;
104}
105
106/***************************************************************************/
107