static int __init eisa_probe()

in eisa.c [294:387]

• 79 lines of code
• 12 McCabe index (conditional complexity)

static int __init eisa_probe(struct parisc_device *dev)
{
	int i, result;

	char *name = is_mongoose(dev) ? "Mongoose" : "Wax";

	printk(KERN_INFO "%s EISA Adapter found at 0x%08lx\n",
		name, (unsigned long)dev->hpa.start);

	eisa_dev.hba.dev = dev;
	eisa_dev.hba.iommu = ccio_get_iommu(dev);

	eisa_dev.hba.lmmio_space.name = "EISA";
	eisa_dev.hba.lmmio_space.start = F_EXTEND(0xfc000000);
	eisa_dev.hba.lmmio_space.end = F_EXTEND(0xffbfffff);
	eisa_dev.hba.lmmio_space.flags = IORESOURCE_MEM;
	result = ccio_request_resource(dev, &eisa_dev.hba.lmmio_space);
	if (result < 0) {
		printk(KERN_ERR "EISA: failed to claim EISA Bus address space!\n");
		return result;
	}
	eisa_dev.hba.io_space.name = "EISA";
	eisa_dev.hba.io_space.start = 0;
	eisa_dev.hba.io_space.end = 0xffff;
	eisa_dev.hba.lmmio_space.flags = IORESOURCE_IO;
	result = request_resource(&ioport_resource, &eisa_dev.hba.io_space);
	if (result < 0) {
		printk(KERN_ERR "EISA: failed to claim EISA Bus port space!\n");
		return result;
	}
	pcibios_register_hba(&eisa_dev.hba);

	result = request_irq(dev->irq, eisa_irq, IRQF_SHARED, "EISA", &eisa_dev);
	if (result) {
		printk(KERN_ERR "EISA: request_irq failed!\n");
		goto error_release;
	}

	/* Reserve IRQ2 */
	if (request_irq(2, dummy_irq2_handler, 0, "cascade", NULL))
		pr_err("Failed to request irq 2 (cascade)\n");
	for (i = 0; i < 16; i++) {
		irq_set_chip_and_handler(i, &eisa_interrupt_type,
					 handle_simple_irq);
	}

	EISA_bus = 1;

	if (dev->num_addrs) {
		/* newer firmware hand out the eeprom address */
		eisa_dev.eeprom_addr = dev->addr[0];
	} else {
		/* old firmware, need to figure out the box */
		if (is_mongoose(dev)) {
			eisa_dev.eeprom_addr = SNAKES_EEPROM_BASE_ADDR;
		} else {
			eisa_dev.eeprom_addr = MIRAGE_EEPROM_BASE_ADDR;
		}
	}
	eisa_eeprom_addr = ioremap(eisa_dev.eeprom_addr, HPEE_MAX_LENGTH);
	if (!eisa_eeprom_addr) {
		result = -ENOMEM;
		printk(KERN_ERR "EISA: ioremap failed!\n");
		goto error_free_irq;
	}
	result = eisa_enumerator(eisa_dev.eeprom_addr, &eisa_dev.hba.io_space,
			&eisa_dev.hba.lmmio_space);
	init_eisa_pic();

	if (result >= 0) {
		/* FIXME : Don't enumerate the bus twice. */
		eisa_dev.root.dev = &dev->dev;
		dev_set_drvdata(&dev->dev, &eisa_dev.root);
		eisa_dev.root.bus_base_addr = 0;
		eisa_dev.root.res = &eisa_dev.hba.io_space;
		eisa_dev.root.slots = result;
		eisa_dev.root.dma_mask = 0xffffffff; /* wild guess */
		if (eisa_root_register (&eisa_dev.root)) {
			printk(KERN_ERR "EISA: Failed to register EISA root\n");
			result = -ENOMEM;
			goto error_iounmap;
		}
	}

	return 0;

error_iounmap:
	iounmap(eisa_eeprom_addr);
error_free_irq:
	free_irq(dev->irq, &eisa_dev);
error_release:
	release_resource(&eisa_dev.hba.io_space);
	return result;
}