static int __init dino_common_init()

in dino.c [804:883]

• 45 lines of code
• 5 McCabe index (conditional complexity)

static int __init dino_common_init(struct parisc_device *dev,
		struct dino_device *dino_dev, const char *name)
{
	int status;
	u32 eim;
	struct gsc_irq gsc_irq;
	struct resource *res;

	pcibios_register_hba(&dino_dev->hba);

	pci_bios = &dino_bios_ops;   /* used by pci_scan_bus() */
	pci_port = &dino_port_ops;

	/*
	** Note: SMP systems can make use of IRR1/IAR1 registers
	**   But it won't buy much performance except in very
	**   specific applications/configurations. Note Dino
	**   still only has 11 IRQ input lines - just map some of them
	**   to a different processor.
	*/
	dev->irq = gsc_alloc_irq(&gsc_irq);
	dino_dev->txn_addr = gsc_irq.txn_addr;
	dino_dev->txn_data = gsc_irq.txn_data;
	eim = ((u32) gsc_irq.txn_addr) | gsc_irq.txn_data;

	/* 
	** Dino needs a PA "IRQ" to get a processor's attention.
	** arch/parisc/kernel/irq.c returns an EIRR bit.
	*/
	if (dev->irq < 0) {
		printk(KERN_WARNING "%s: gsc_alloc_irq() failed\n", name);
		return 1;
	}

	status = request_irq(dev->irq, dino_isr, 0, name, dino_dev);
	if (status) {
		printk(KERN_WARNING "%s: request_irq() failed with %d\n", 
			name, status);
		return 1;
	}

	/* Support the serial port which is sometimes attached on built-in
	 * Dino / Cujo chips.
	 */

	gsc_fixup_irqs(dev, dino_dev, dino_choose_irq);

	/*
	** This enables DINO to generate interrupts when it sees
	** any of its inputs *change*. Just asserting an IRQ
	** before it's enabled (ie unmasked) isn't good enough.
	*/
	__raw_writel(eim, dino_dev->hba.base_addr+DINO_IAR0);

	/*
	** Some platforms don't clear Dino's IRR0 register at boot time.
	** Reading will clear it now.
	*/
	__raw_readl(dino_dev->hba.base_addr+DINO_IRR0);

	/* allocate I/O Port resource region */
	res = &dino_dev->hba.io_space;
	if (!is_cujo(&dev->id)) {
		res->name = "Dino I/O Port";
	} else {
		res->name = "Cujo I/O Port";
	}
	res->start = HBA_PORT_BASE(dino_dev->hba.hba_num);
	res->end = res->start + (HBA_PORT_SPACE_SIZE - 1);
	res->flags = IORESOURCE_IO; /* do not mark it busy ! */
	if (request_resource(&ioport_resource, res) < 0) {
		printk(KERN_ERR "%s: request I/O Port region failed "
		       "0x%lx/%lx (hpa 0x%px)\n",
		       name, (unsigned long)res->start, (unsigned long)res->end,
		       dino_dev->hba.base_addr);
		return 1;
	}

	return 0;
}