1 /***************************************************************************/
4 * linux/arch/m68knommu/platform/68328/timers.c
6 * Copyright (C) 1993 Hamish Macdonald
7 * Copyright (C) 1999 D. Jeff Dionne
8 * Copyright (C) 2001 Georges Menie, Ken Desmet
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
15 /***************************************************************************/
17 #include <linux/types.h>
18 #include <linux/kernel.h>
20 #include <asm/setup.h>
21 #include <asm/system.h>
22 #include <asm/pgtable.h>
24 #include <asm/machdep.h>
25 #include <asm/MC68VZ328.h>
27 /***************************************************************************/
29 #if defined(CONFIG_DRAGEN2)
30 /* with a 33.16 MHz clock, this will give usec resolution to the time functions */
31 #define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK
33 #define TICKS_PER_JIFFY 41450
35 #elif defined(CONFIG_XCOPILOT_BUGS)
37 * The only thing I know is that CLK32 is not available on Xcopilot
38 * I have little idea about what frequency SYSCLK has on Xcopilot.
39 * The values for prescaler and compare registers were simply
40 * taken from the original source
42 #define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK
44 #define TICKS_PER_JIFFY 0xd7e4
47 /* default to using the 32Khz clock */
48 #define CLOCK_SOURCE TCTL_CLKSOURCE_32KHZ
50 #define TICKS_PER_JIFFY 10
53 /***************************************************************************/
55 void m68328_timer_init(irqreturn_t (*timer_routine) (int, void *, struct pt_regs *))
61 if (request_irq(TMR_IRQ_NUM, timer_routine, IRQ_FLG_LOCK, "timer", NULL))
62 panic("Unable to attach timer interrupt\n");
64 /* Restart mode, Enable int, Set clock source */
65 TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE;
67 TCMP = TICKS_PER_JIFFY;
73 /***************************************************************************/
75 void m68328_timer_tick(void)
80 /***************************************************************************/
82 unsigned long m68328_timer_gettimeoffset(void)
84 unsigned long ticks = TCN, offset = 0;
86 /* check for pending interrupt */
87 if (ticks < (TICKS_PER_JIFFY >> 1) && (ISR & (1 << TMR_IRQ_NUM)))
88 offset = 1000000 / HZ;
89 ticks = (ticks * 1000000 / HZ) / TICKS_PER_JIFFY;
90 return ticks + offset;
93 /***************************************************************************/
95 void m68328_timer_gettod(int *year, int *mon, int *day, int *hour, int *min, int *sec)
99 *year = *mon = *day = 1;
100 *hour = (now >> 24) % 24;
101 *min = (now >> 16) % 60;
105 /***************************************************************************/