static int etm_probe()

in coresight/coresight-etm3x-core.c [821:906]

• 67 lines of code
• 13 McCabe index (conditional complexity)

static int etm_probe(struct amba_device *adev, const struct amba_id *id)
{
	int ret;
	void __iomem *base;
	struct device *dev = &adev->dev;
	struct coresight_platform_data *pdata = NULL;
	struct etm_drvdata *drvdata;
	struct resource *res = &adev->res;
	struct coresight_desc desc = { 0 };

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

	drvdata->use_cp14 = fwnode_property_read_bool(dev->fwnode, "arm,cp14");
	dev_set_drvdata(dev, drvdata);

	/* Validity for the resource is already checked by the AMBA core */
	base = devm_ioremap_resource(dev, res);
	if (IS_ERR(base))
		return PTR_ERR(base);

	drvdata->base = base;
	desc.access = CSDEV_ACCESS_IOMEM(base);

	spin_lock_init(&drvdata->spinlock);

	drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
	if (!IS_ERR(drvdata->atclk)) {
		ret = clk_prepare_enable(drvdata->atclk);
		if (ret)
			return ret;
	}

	drvdata->cpu = coresight_get_cpu(dev);
	if (drvdata->cpu < 0)
		return drvdata->cpu;

	desc.name  = devm_kasprintf(dev, GFP_KERNEL, "etm%d", drvdata->cpu);
	if (!desc.name)
		return -ENOMEM;

	if (smp_call_function_single(drvdata->cpu,
				     etm_init_arch_data,  drvdata, 1))
		dev_err(dev, "ETM arch init failed\n");

	if (etm_arch_supported(drvdata->arch) == false)
		return -EINVAL;

	etm_init_trace_id(drvdata);
	etm_set_default(&drvdata->config);

	pdata = coresight_get_platform_data(dev);
	if (IS_ERR(pdata))
		return PTR_ERR(pdata);

	adev->dev.platform_data = pdata;

	desc.type = CORESIGHT_DEV_TYPE_SOURCE;
	desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;
	desc.ops = &etm_cs_ops;
	desc.pdata = pdata;
	desc.dev = dev;
	desc.groups = coresight_etm_groups;
	drvdata->csdev = coresight_register(&desc);
	if (IS_ERR(drvdata->csdev))
		return PTR_ERR(drvdata->csdev);

	ret = etm_perf_symlink(drvdata->csdev, true);
	if (ret) {
		coresight_unregister(drvdata->csdev);
		return ret;
	}

	etmdrvdata[drvdata->cpu] = drvdata;

	pm_runtime_put(&adev->dev);
	dev_info(&drvdata->csdev->dev,
		 "%s initialized\n", (char *)coresight_get_uci_data(id));
	if (boot_enable) {
		coresight_enable(drvdata->csdev);
		drvdata->boot_enable = true;
	}

	return 0;
}