1 /*
2 * linux/include/asm-arm/arch-epxa10db/time.h
3 *
4 * Copyright (C) 2001 Altera Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20 #include <linux/config.h>
21 #include <asm/system.h>
22 #include <asm/leds.h>
23 #include <asm/arch/hardware.h>
24 #define TIMER00_TYPE (volatile unsigned int*)
25 #include <asm/arch/timer00.h>
26
27
28 /*
29 * IRQ handler for the timer
30 */
excalibur_timer_interrupt(int irq,void * dev_id,struct pt_regs * regs)31 static void excalibur_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
32 {
33
34 // ...clear the interrupt
35 *TIMER0_CR(IO_ADDRESS(EXC_TIMER00_BASE))|=TIMER0_CR_CI_MSK;
36
37 do_leds();
38 do_timer(regs);
39 do_profile(regs);
40 }
41
42 /*
43 * Set up timer interrupt, and return the current time in seconds.
44 */
setup_timer(void)45 extern __inline__ void setup_timer(void)
46 {
47
48
49 timer_irq.handler = excalibur_timer_interrupt;
50
51
52 /*
53 * Make irqs happen for the system timer
54 */
55 setup_arm_irq(IRQ_TIMER0, &timer_irq);
56
57
58 /* Stop the timer, reconfigure it and then restart it */
59
60 *TIMER0_CR(IO_ADDRESS(EXC_TIMER00_BASE))=0;
61 *TIMER0_LIMIT(IO_ADDRESS(EXC_TIMER00_BASE))=(unsigned int)(EXC_AHB2_CLK_FREQUENCY/200);
62 *TIMER0_PRESCALE(IO_ADDRESS(EXC_TIMER00_BASE))=1;
63 *TIMER0_CR(IO_ADDRESS(EXC_TIMER00_BASE))=TIMER0_CR_IE_MSK | TIMER0_CR_S_MSK;
64 }
65