static __init int nios2_clocksource_init()

in kernel/time.c [281:310]

• 21 lines of code
• 3 McCabe index (conditional complexity)

static __init int nios2_clocksource_init(struct device_node *timer)
{
	unsigned int ctrl;
	void __iomem *iobase;
	u32 freq;
	int ret;

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

	nios2_cs.timer.base = iobase;
	nios2_cs.timer.freq = freq;

	ret = clocksource_register_hz(&nios2_cs.cs, freq);
	if (ret)
		return ret;

	timer_writew(&nios2_cs.timer, USHRT_MAX, ALTERA_TIMER_PERIODL_REG);
	timer_writew(&nios2_cs.timer, USHRT_MAX, ALTERA_TIMER_PERIODH_REG);

	/* interrupt disable + continuous + start */
	ctrl = ALTERA_TIMER_CONTROL_CONT_MSK | ALTERA_TIMER_CONTROL_START_MSK;
	timer_writew(&nios2_cs.timer, ctrl, ALTERA_TIMER_CONTROL_REG);

	/* Calibrate the delay loop directly */
	lpj_fine = freq / HZ;

	return 0;
}