static int highbank_mc_probe()

in highbank_mc_edac.c [144:248]

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

static int highbank_mc_probe(struct platform_device *pdev)
{
	const struct of_device_id *id;
	const struct hb_mc_settings *settings;
	struct edac_mc_layer layers[2];
	struct mem_ctl_info *mci;
	struct hb_mc_drvdata *drvdata;
	struct dimm_info *dimm;
	struct resource *r;
	void __iomem *base;
	u32 control;
	int irq;
	int res = 0;

	id = of_match_device(hb_ddr_ctrl_of_match, &pdev->dev);
	if (!id)
		return -ENODEV;

	layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
	layers[0].size = 1;
	layers[0].is_virt_csrow = true;
	layers[1].type = EDAC_MC_LAYER_CHANNEL;
	layers[1].size = 1;
	layers[1].is_virt_csrow = false;
	mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
			    sizeof(struct hb_mc_drvdata));
	if (!mci)
		return -ENOMEM;

	mci->pdev = &pdev->dev;
	drvdata = mci->pvt_info;
	platform_set_drvdata(pdev, mci);

	if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
		return -ENOMEM;

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!r) {
		dev_err(&pdev->dev, "Unable to get mem resource\n");
		res = -ENODEV;
		goto err;
	}

	if (!devm_request_mem_region(&pdev->dev, r->start,
				     resource_size(r), dev_name(&pdev->dev))) {
		dev_err(&pdev->dev, "Error while requesting mem region\n");
		res = -EBUSY;
		goto err;
	}

	base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
	if (!base) {
		dev_err(&pdev->dev, "Unable to map regs\n");
		res = -ENOMEM;
		goto err;
	}

	settings = id->data;
	drvdata->mc_err_base = base + settings->err_offset;
	drvdata->mc_int_base = base + settings->int_offset;

	control = readl(drvdata->mc_err_base + HB_DDR_ECC_OPT) & 0x3;
	if (!control || (control == 0x2)) {
		dev_err(&pdev->dev, "No ECC present, or ECC disabled\n");
		res = -ENODEV;
		goto err;
	}

	mci->mtype_cap = MEM_FLAG_DDR3;
	mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
	mci->edac_cap = EDAC_FLAG_SECDED;
	mci->mod_name = pdev->dev.driver->name;
	mci->ctl_name = id->compatible;
	mci->dev_name = dev_name(&pdev->dev);
	mci->scrub_mode = SCRUB_SW_SRC;

	/* Only a single 4GB DIMM is supported */
	dimm = *mci->dimms;
	dimm->nr_pages = (~0UL >> PAGE_SHIFT) + 1;
	dimm->grain = 8;
	dimm->dtype = DEV_X8;
	dimm->mtype = MEM_DDR3;
	dimm->edac_mode = EDAC_SECDED;

	res = edac_mc_add_mc_with_groups(mci, highbank_dev_groups);
	if (res < 0)
		goto err;

	irq = platform_get_irq(pdev, 0);
	res = devm_request_irq(&pdev->dev, irq, highbank_mc_err_handler,
			       0, dev_name(&pdev->dev), mci);
	if (res < 0) {
		dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
		goto err2;
	}

	devres_close_group(&pdev->dev, NULL);
	return 0;
err2:
	edac_mc_del_mc(&pdev->dev);
err:
	devres_release_group(&pdev->dev, NULL);
	edac_mc_free(mci);
	return res;
}