static int __init ingenic_ost_probe()

in ingenic-ost.c [66:142]

• 58 lines of code
• 11 McCabe index (conditional complexity)

static int __init ingenic_ost_probe(struct platform_device *pdev)
{
	const struct ingenic_ost_soc_info *soc_info;
	struct device *dev = &pdev->dev;
	struct ingenic_ost *ost;
	struct clocksource *cs;
	struct regmap *map;
	unsigned long rate;
	int err;

	soc_info = device_get_match_data(dev);
	if (!soc_info)
		return -EINVAL;

	ost = devm_kzalloc(dev, sizeof(*ost), GFP_KERNEL);
	if (!ost)
		return -ENOMEM;

	ingenic_ost = ost;

	ost->regs = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(ost->regs))
		return PTR_ERR(ost->regs);

	map = device_node_to_regmap(dev->parent->of_node);
	if (IS_ERR(map)) {
		dev_err(dev, "regmap not found");
		return PTR_ERR(map);
	}

	ost->clk = devm_clk_get(dev, "ost");
	if (IS_ERR(ost->clk))
		return PTR_ERR(ost->clk);

	err = clk_prepare_enable(ost->clk);
	if (err)
		return err;

	/* Clear counter high/low registers */
	if (soc_info->is64bit)
		regmap_write(map, TCU_REG_OST_CNTL, 0);
	regmap_write(map, TCU_REG_OST_CNTH, 0);

	/* Don't reset counter at compare value. */
	regmap_update_bits(map, TCU_REG_OST_TCSR,
			   TCU_OST_TCSR_MASK, TCU_OST_TCSR_CNT_MD);

	rate = clk_get_rate(ost->clk);

	/* Enable OST TCU channel */
	regmap_write(map, TCU_REG_TESR, BIT(TCU_OST_CHANNEL));

	cs = &ost->cs;
	cs->name	= "ingenic-ost";
	cs->rating	= 320;
	cs->flags	= CLOCK_SOURCE_IS_CONTINUOUS;
	cs->mask	= CLOCKSOURCE_MASK(32);

	if (soc_info->is64bit)
		cs->read = ingenic_ost_clocksource_readl;
	else
		cs->read = ingenic_ost_clocksource_readh;

	err = clocksource_register_hz(cs, rate);
	if (err) {
		dev_err(dev, "clocksource registration failed");
		clk_disable_unprepare(ost->clk);
		return err;
	}

	if (soc_info->is64bit)
		sched_clock_register(ingenic_ost_read_cntl, 32, rate);
	else
		sched_clock_register(ingenic_ost_read_cnth, 32, rate);

	return 0;
}