1/*
2 * linux/include/asm-arm/arch-l7200/time.h
3 *
4 * Copyright (C) 2000 Rob Scott (rscott@mtrob.fdns.net)
5 *                    Steve Hill (sjhill@cotw.com)
6 *
7 * Changelog:
8 *   01-02-2000	RS	Created l7200 version, derived from rpc code
9 *   05-03-2000	SJH	Complete rewrite
10 */
11#ifndef _ASM_ARCH_TIME_H
12#define _ASM_ARCH_TIME_H
13
14#include <asm/arch/irqs.h>
15
16/*
17 * RTC base register address
18 */
19#define RTC_BASE	(IO_BASE_2 + 0x2000)
20
21/*
22 * RTC registers
23 */
24#define RTC_RTCDR	(*(volatile unsigned char *) (RTC_BASE + 0x000))
25#define RTC_RTCMR	(*(volatile unsigned char *) (RTC_BASE + 0x004))
26#define RTC_RTCS	(*(volatile unsigned char *) (RTC_BASE + 0x008))
27#define RTC_RTCC	(*(volatile unsigned char *) (RTC_BASE + 0x008))
28#define RTC_RTCDV	(*(volatile unsigned char *) (RTC_BASE + 0x00c))
29#define RTC_RTCCR	(*(volatile unsigned char *) (RTC_BASE + 0x010))
30
31/*
32 * RTCCR register values
33 */
34#define RTC_RATE_32	0x00      /* 32 Hz tick */
35#define RTC_RATE_64	0x10      /* 64 Hz tick */
36#define RTC_RATE_128	0x20      /* 128 Hz tick */
37#define RTC_RATE_256	0x30      /* 256 Hz tick */
38#define RTC_EN_ALARM	0x01      /* Enable alarm */
39#define RTC_EN_TIC	0x04      /* Enable counter */
40#define RTC_EN_STWDOG	0x08      /* Enable watchdog */
41
42/*
43 * Handler for RTC timer interrupt
44 */
45static irqreturn_t
46timer_interrupt(int irq, void *dev_id)
47{
48	struct pt_regs *regs = get_irq_regs();
49	do_timer(1);
50#ifndef CONFIG_SMP
51	update_process_times(user_mode(regs));
52#endif
53	do_profile(regs);
54	RTC_RTCC = 0;				/* Clear interrupt */
55
56	return IRQ_HANDLED;
57}
58
59/*
60 * Set up RTC timer interrupt, and return the current time in seconds.
61 */
62void __init time_init(void)
63{
64	RTC_RTCC = 0;				/* Clear interrupt */
65
66	timer_irq.handler = timer_interrupt;
67
68	setup_irq(IRQ_RTC_TICK, &timer_irq);
69
70	RTC_RTCCR = RTC_RATE_128 | RTC_EN_TIC;	/* Set rate and enable timer */
71}
72
73#endif
74