参照元

説明

引数

返り値

参考

実装

static int arm_smmu_device_dt_probe(struct platform_device *pdev)
{
	const struct of_device_id *of_id;
	struct resource *res;
	struct arm_smmu_device *smmu;
	struct device *dev = &pdev->dev;
	struct rb_node *node;
	struct of_phandle_args masterspec;
	int num_irqs, i, err;
	smmu = devm_kzalloc(dev, sizeof(*smmu), GFP_KERNEL);
	if (!smmu) {
		dev_err(dev, "failed to allocate arm_smmu_device\n");
		return -ENOMEM;
	}
	smmu->dev = dev;
	of_id = of_match_node(arm_smmu_of_match, dev->of_node);
	smmu->version = (enum arm_smmu_arch_version)of_id->data;
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	smmu->base = devm_ioremap_resource(dev, res);
	if (IS_ERR(smmu->base))
		return PTR_ERR(smmu->base);
	smmu->size = resource_size(res);
	if (of_property_read_u32(dev->of_node, "#global-interrupts",
				 &smmu->num_global_irqs)) {
		dev_err(dev, "missing #global-interrupts property\n");
		return -ENODEV;
	}
	num_irqs = 0;
	while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, num_irqs))) {
		num_irqs++;
		if (num_irqs > smmu->num_global_irqs)
			smmu->num_context_irqs++;
	}

	if (!smmu->num_context_irqs) {
		dev_err(dev, "found %d interrupts but expected at least %d\n",
			num_irqs, smmu->num_global_irqs + 1);
		return -ENODEV;
	}

	smmu->irqs = devm_kzalloc(dev, sizeof(*smmu->irqs) * num_irqs,
				  GFP_KERNEL);
	if (!smmu->irqs) {
		dev_err(dev, "failed to allocate %d irqs\n", num_irqs);
		return -ENOMEM;
	}

	for (i = 0; i < num_irqs; ++i) {
		int irq = platform_get_irq(pdev, i);

		if (irq < 0) {
			dev_err(dev, "failed to get irq index %d\n", i);
			return -ENODEV;
		}
		smmu->irqs[i] = irq;
	}
	err = arm_smmu_device_cfg_probe(smmu);
	if (err)
		return err;
	i = 0;
	smmu->masters = RB_ROOT;
	while (!of_parse_phandle_with_args(dev->of_node, "mmu-masters",
					   "#stream-id-cells", i,
					   &masterspec)) {
		err = register_smmu_master(smmu, dev, &masterspec);
		if (err) {
			dev_err(dev, "failed to add master %s\n",
				masterspec.np->name);
			goto out_put_masters;
		}

		i++;
	}
	dev_notice(dev, "registered %d master devices\n", i);
	parse_driver_options(smmu);
	if (smmu->version > ARM_SMMU_V1 &&
	    smmu->num_context_banks != smmu->num_context_irqs) {
		dev_err(dev,
			"found only %d context interrupt(s) but %d required\n",
			smmu->num_context_irqs, smmu->num_context_banks);
		err = -ENODEV;
		goto out_put_masters;
	}

	for (i = 0; i < smmu->num_global_irqs; ++i) {
		err = request_irq(smmu->irqs[i],
				  arm_smmu_global_fault,
				  IRQF_SHARED,
				  "arm-smmu global fault",
				  smmu);
		if (err) {
			dev_err(dev, "failed to request global IRQ %d (%u)\n",
				i, smmu->irqs[i]);
			goto out_free_irqs;
		}
	}
	INIT_LIST_HEAD(&smmu->list);
	spin_lock(&arm_smmu_devices_lock);
	list_add(&smmu->list, &arm_smmu_devices);
	spin_unlock(&arm_smmu_devices_lock);
	arm_smmu_device_reset(smmu);
	return 0;

out_free_irqs:
	while (i--)
		free_irq(smmu->irqs[i], smmu);
out_put_masters:
	for (node = rb_first(&smmu->masters); node; node = rb_next(node)) {
		struct arm_smmu_master *master
			= container_of(node, struct arm_smmu_master, node);
		of_node_put(master->of_node);
	}
	return err;
}

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Last-modified: 2017-11-27 (月) 20:11:50