static __init int nios2_clockevent_init()

in kernel/time.c [243:279]

• 28 lines of code
• 4 McCabe index (conditional complexity)

static __init int nios2_clockevent_init(struct device_node *timer)
{
	void __iomem *iobase;
	u32 freq;
	int irq, ret;

	ret = nios2_timer_get_base_and_freq(timer, &iobase, &freq);
	if (ret)
		return ret;

	irq = irq_of_parse_and_map(timer, 0);
	if (!irq) {
		pr_crit("Unable to parse timer irq\n");
		return -EINVAL;
	}

	nios2_ce.timer.base = iobase;
	nios2_ce.timer.freq = freq;

	nios2_ce.ced.cpumask = cpumask_of(0);
	nios2_ce.ced.irq = irq;

	nios2_timer_stop(&nios2_ce.timer);
	/* clear pending interrupt */
	timer_writew(&nios2_ce.timer, 0, ALTERA_TIMER_STATUS_REG);

	ret = request_irq(irq, timer_interrupt, IRQF_TIMER, timer->name,
			  &nios2_ce.ced);
	if (ret) {
		pr_crit("Unable to setup timer irq\n");
		return ret;
	}

	clockevents_config_and_register(&nios2_ce.ced, freq, 1, ULONG_MAX);

	return 0;
}