static int __init owl_timer_init()

in timer-owl.c [116:173]

• 46 lines of code
• 6 McCabe index (conditional complexity)

static int __init owl_timer_init(struct device_node *node)
{
	struct clk *clk;
	unsigned long rate;
	int timer1_irq, ret;

	owl_timer_base = of_io_request_and_map(node, 0, "owl-timer");
	if (IS_ERR(owl_timer_base)) {
		pr_err("Can't map timer registers\n");
		return PTR_ERR(owl_timer_base);
	}

	owl_clksrc_base = owl_timer_base + 0x08;
	owl_clkevt_base = owl_timer_base + 0x14;

	timer1_irq = of_irq_get_byname(node, "timer1");
	if (timer1_irq <= 0) {
		pr_err("Can't parse timer1 IRQ\n");
		return -EINVAL;
	}

	clk = of_clk_get(node, 0);
	if (IS_ERR(clk)) {
		ret = PTR_ERR(clk);
		pr_err("Failed to get clock for clocksource (%d)\n", ret);
		return ret;
	}

	rate = clk_get_rate(clk);

	owl_timer_reset(owl_clksrc_base);
	owl_timer_set_enabled(owl_clksrc_base, true);

	sched_clock_register(owl_timer_sched_read, 32, rate);
	ret = clocksource_mmio_init(owl_clksrc_base + OWL_Tx_VAL, node->name,
				    rate, 200, 32, clocksource_mmio_readl_up);
	if (ret) {
		pr_err("Failed to register clocksource (%d)\n", ret);
		return ret;
	}

	owl_timer_reset(owl_clkevt_base);

	ret = request_irq(timer1_irq, owl_timer1_interrupt, IRQF_TIMER,
			  "owl-timer", &owl_clockevent);
	if (ret) {
		pr_err("failed to request irq %d\n", timer1_irq);
		return ret;
	}

	owl_clockevent.cpumask = cpumask_of(0);
	owl_clockevent.irq = timer1_irq;

	clockevents_config_and_register(&owl_clockevent, rate,
					0xf, 0xffffffff);

	return 0;
}