static void bcma_core_mips_set_irq()

in driver_mips.c [94:142]

• 38 lines of code
• 7 McCabe index (conditional complexity)

static void bcma_core_mips_set_irq(struct bcma_device *dev, unsigned int irq)
{
	unsigned int oldirq = bcma_core_mips_irq(dev);
	struct bcma_bus *bus = dev->bus;
	struct bcma_device *mdev = bus->drv_mips.core;
	u32 irqflag;

	irqflag = bcma_core_mips_irqflag(dev);
	BUG_ON(oldirq == 6);

	dev->irq = irq + 2;

	/* clear the old irq */
	if (oldirq == 0)
		bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
			    bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) &
			    ~(1 << irqflag));
	else if (oldirq != 5)
		bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(oldirq), 0);

	/* assign the new one */
	if (irq == 0) {
		bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0),
			    bcma_read32(mdev, BCMA_MIPS_MIPS74K_INTMASK(0)) |
			    (1 << irqflag));
	} else {
		u32 irqinitmask = bcma_read32(mdev,
					      BCMA_MIPS_MIPS74K_INTMASK(irq));
		if (irqinitmask) {
			struct bcma_device *core;

			/* backplane irq line is in use, find out who uses
			 * it and set user to irq 0
			 */
			list_for_each_entry(core, &bus->cores, list) {
				if ((1 << bcma_core_mips_irqflag(core)) ==
				    irqinitmask) {
					bcma_core_mips_set_irq(core, 0);
					break;
				}
			}
		}
		bcma_write32(mdev, BCMA_MIPS_MIPS74K_INTMASK(irq),
			     1 << irqflag);
	}

	bcma_debug(bus, "set_irq: core 0x%04x, irq %d => %d\n",
		   dev->id.id, oldirq <= 4 ? oldirq + 2 : 0, irq + 2);
}