2 * linux/arch/arm/mach-epxa10db/time.c
4 * Copyright (C) 2000 Deep Blue Solutions
5 * Copyright (C) 2001 Altera Corporation
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/interrupt.h>
14 #include <linux/sched.h>
16 #include <asm/hardware.h>
17 #include <asm/system.h>
20 #include <asm/mach/time.h>
22 #define TIMER00_TYPE (volatile unsigned int*)
23 #include <asm/arch/timer00.h>
25 static int epxa10db_set_rtc(void)
30 static int epxa10db_rtc_init(void)
32 set_rtc
= epxa10db_set_rtc
;
37 __initcall(epxa10db_rtc_init
);
41 * IRQ handler for the timer
44 epxa10db_timer_interrupt(int irq
, void *dev_id
, struct pt_regs
*regs
)
46 write_seqlock(&xtime_lock
);
48 // ...clear the interrupt
49 *TIMER0_CR(IO_ADDRESS(EXC_TIMER00_BASE
))|=TIMER0_CR_CI_MSK
;
52 write_sequnlock(&xtime_lock
);
57 static struct irqaction epxa10db_timer_irq
= {
58 .name
= "Excalibur Timer Tick",
59 .flags
= SA_INTERRUPT
| SA_TIMER
,
60 .handler
= epxa10db_timer_interrupt
,
64 * Set up timer interrupt, and return the current time in seconds.
66 static void __init
epxa10db_timer_init(void)
69 *TIMER0_LIMIT(IO_ADDRESS(EXC_TIMER00_BASE
))=(unsigned int)(EXC_AHB2_CLK_FREQUENCY
/200);
70 *TIMER0_PRESCALE(IO_ADDRESS(EXC_TIMER00_BASE
))=1;
71 *TIMER0_CR(IO_ADDRESS(EXC_TIMER00_BASE
))=TIMER0_CR_IE_MSK
| TIMER0_CR_S_MSK
;
73 setup_irq(IRQ_TIMER0
, &epxa10db_timer_irq
);
76 struct sys_timer epxa10db_timer
= {
77 .init
= epxa10db_timer_init
,