void sba_directed_lmmio()

in sba_iommu.c [2014:2045]

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

void sba_directed_lmmio(struct parisc_device *pci_hba, struct resource *r)
{
	struct parisc_device *sba_dev = parisc_parent(pci_hba);
	struct sba_device *sba = dev_get_drvdata(&sba_dev->dev);
	char t = sba_dev->id.hw_type;
	int i;
	int rope = (pci_hba->hw_path & (ROPES_PER_IOC-1));  /* rope # */

	BUG_ON((t!=HPHW_IOA) && (t!=HPHW_BCPORT));

	r->start = r->end = 0;

	/* Astro has 4 directed ranges. Not sure about Ike/Pluto/et al */
	for (i=0; i<4; i++) {
		int base, size;
		void __iomem *reg = sba->sba_hpa + i*0x18;

		base = READ_REG32(reg + LMMIO_DIRECT0_BASE);
		if ((base & 1) == 0)
			continue;	/* not enabled */

		size = READ_REG32(reg + LMMIO_DIRECT0_ROUTE);

		if ((size & (ROPES_PER_IOC-1)) != rope)
			continue;	/* directed down different rope */
		
		r->start = (base & ~1UL) | PCI_F_EXTEND;
		size = ~ READ_REG32(reg + LMMIO_DIRECT0_MASK);
		r->end = r->start + size;
		r->flags = IORESOURCE_MEM;
	}
}