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 <linux/interrupt.h>
21 #include <linux/irq.h>
22 #include <linux/clocksource.h>
23 #include <linux/rtc.h>
24 #include <asm/setup.h>
25 #include <asm/pgtable.h>
26 #include <asm/machdep.h>
27 #include <asm/MC68VZ328.h>
29 /***************************************************************************/
31 #if defined(CONFIG_DRAGEN2)
32 /* with a 33.16 MHz clock, this will give usec resolution to the time functions */
33 #define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK
35 #define TICKS_PER_JIFFY 41450
37 #elif defined(CONFIG_XCOPILOT_BUGS)
39 * The only thing I know is that CLK32 is not available on Xcopilot
40 * I have little idea about what frequency SYSCLK has on Xcopilot.
41 * The values for prescaler and compare registers were simply
42 * taken from the original source
44 #define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK
46 #define TICKS_PER_JIFFY 0xd7e4
49 /* default to using the 32Khz clock */
50 #define CLOCK_SOURCE TCTL_CLKSOURCE_32KHZ
52 #define TICKS_PER_JIFFY 10
55 static u32 m68328_tick_cnt;
57 /***************************************************************************/
59 static irqreturn_t hw_tick(int irq, void *dummy)
64 m68328_tick_cnt += TICKS_PER_JIFFY;
65 return arch_timer_interrupt(irq, dummy);
68 /***************************************************************************/
70 static struct irqaction m68328_timer_irq = {
72 .flags = IRQF_DISABLED | IRQF_TIMER,
76 /***************************************************************************/
78 static cycle_t m68328_read_clk(struct clocksource *cs)
83 local_irq_save(flags);
84 cycles = m68328_tick_cnt + TCN;
85 local_irq_restore(flags);
90 /***************************************************************************/
92 static struct clocksource m68328_clk = {
95 .read = m68328_read_clk,
96 .mask = CLOCKSOURCE_MASK(32),
97 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
100 /***************************************************************************/
102 void hw_timer_init(void)
104 /* disable timer 1 */
108 setup_irq(TMR_IRQ_NUM, &m68328_timer_irq);
110 /* Restart mode, Enable int, Set clock source */
111 TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE;
113 TCMP = TICKS_PER_JIFFY;
117 clocksource_register_hz(&m68328_clk, TICKS_PER_JIFFY*HZ);
120 /***************************************************************************/
122 int m68328_hwclk(int set, struct rtc_time *t)
126 t->tm_year = t->tm_mon = t->tm_mday = 1;
127 t->tm_hour = (now >> 24) % 24;
128 t->tm_min = (now >> 16) % 60;
129 t->tm_sec = now % 60;
135 /***************************************************************************/