| /* |
| * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
| * Licensed under the GPL |
| */ |
| |
| #include <linux/clockchips.h> |
| #include <linux/init.h> |
| #include <linux/interrupt.h> |
| #include <linux/jiffies.h> |
| #include <linux/threads.h> |
| #include <asm/irq.h> |
| #include <asm/param.h> |
| #include "kern_util.h" |
| #include "os.h" |
| |
| void timer_handler(int sig, struct uml_pt_regs *regs) |
| { |
| unsigned long flags; |
| |
| local_irq_save(flags); |
| do_IRQ(TIMER_IRQ, regs); |
| local_irq_restore(flags); |
| } |
| |
| static void itimer_set_mode(enum clock_event_mode mode, |
| struct clock_event_device *evt) |
| { |
| switch (mode) { |
| case CLOCK_EVT_MODE_PERIODIC: |
| set_interval(); |
| break; |
| |
| case CLOCK_EVT_MODE_SHUTDOWN: |
| case CLOCK_EVT_MODE_UNUSED: |
| case CLOCK_EVT_MODE_ONESHOT: |
| disable_timer(); |
| break; |
| |
| case CLOCK_EVT_MODE_RESUME: |
| break; |
| } |
| } |
| |
| static int itimer_next_event(unsigned long delta, |
| struct clock_event_device *evt) |
| { |
| return timer_one_shot(delta + 1); |
| } |
| |
| static struct clock_event_device itimer_clockevent = { |
| .name = "itimer", |
| .rating = 250, |
| .cpumask = cpu_all_mask, |
| .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, |
| .set_mode = itimer_set_mode, |
| .set_next_event = itimer_next_event, |
| .shift = 32, |
| .irq = 0, |
| }; |
| |
| static irqreturn_t um_timer(int irq, void *dev) |
| { |
| (*itimer_clockevent.event_handler)(&itimer_clockevent); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static cycle_t itimer_read(struct clocksource *cs) |
| { |
| return os_nsecs() / 1000; |
| } |
| |
| static struct clocksource itimer_clocksource = { |
| .name = "itimer", |
| .rating = 300, |
| .read = itimer_read, |
| .mask = CLOCKSOURCE_MASK(64), |
| .mult = 1000, |
| .shift = 0, |
| .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
| }; |
| |
| static void __init setup_itimer(void) |
| { |
| int err; |
| |
| err = request_irq(TIMER_IRQ, um_timer, IRQF_DISABLED, "timer", NULL); |
| if (err != 0) |
| printk(KERN_ERR "register_timer : request_irq failed - " |
| "errno = %d\n", -err); |
| |
| itimer_clockevent.mult = div_sc(HZ, NSEC_PER_SEC, 32); |
| itimer_clockevent.max_delta_ns = |
| clockevent_delta2ns(60 * HZ, &itimer_clockevent); |
| itimer_clockevent.min_delta_ns = |
| clockevent_delta2ns(1, &itimer_clockevent); |
| err = clocksource_register(&itimer_clocksource); |
| if (err) { |
| printk(KERN_ERR "clocksource_register returned %d\n", err); |
| return; |
| } |
| clockevents_register_device(&itimer_clockevent); |
| } |
| |
| void __init time_init(void) |
| { |
| long long nsecs; |
| |
| timer_init(); |
| |
| nsecs = os_nsecs(); |
| set_normalized_timespec(&wall_to_monotonic, -nsecs / NSEC_PER_SEC, |
| -nsecs % NSEC_PER_SEC); |
| set_normalized_timespec(&xtime, nsecs / NSEC_PER_SEC, |
| nsecs % NSEC_PER_SEC); |
| late_time_init = setup_itimer; |
| } |