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authorGreg Ungerer <gerg@snapgear.com>2005-09-08 19:32:14 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-08 20:27:37 -0400
commit75003c4812ae23a8a99e9921bbe66ffb0e784c8e (patch)
treea922c4cd32eff67262271ee991e1765baa99f52d /arch/m68knommu/platform
parenta79626604bc044cec30bfc6cc3332007588e1a94 (diff)
[PATCH] m68knommu: create common timer code for 68x328 processor varients
Create common timer code for all 68x328 processor varients. Signed-off-by: Greg Ungerer <gerg@uclinux.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/m68knommu/platform')
-rw-r--r--arch/m68knommu/platform/68328/timers.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/arch/m68knommu/platform/68328/timers.c b/arch/m68knommu/platform/68328/timers.c
new file mode 100644
index 000000000000..68c2cd6b0030
--- /dev/null
+++ b/arch/m68knommu/platform/68328/timers.c
@@ -0,0 +1,106 @@
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/config.h>
18#include <linux/types.h>
19#include <linux/kernel.h>
20#include <linux/mm.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(irqreturn_t (*timer_routine) (int, void *, struct pt_regs *))
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/***************************************************************************/