+/**
+ * cmd64x_interrupt - ATA host interrupt handler
+ * @irq: irq line (unused)
+ * @dev_instance: pointer to our ata_host information structure
+ *
+ * Our interrupt handler for PCI IDE devices. Calls
+ * ata_sff_host_intr() for each port that is flagging an IRQ. We cannot
+ * use the defaults as we need to avoid touching status/altstatus during
+ * a DMA.
+ *
+ * LOCKING:
+ * Obtains host lock during operation.
+ *
+ * RETURNS:
+ * IRQ_NONE or IRQ_HANDLED.
+ */
+irqreturn_t cmd64x_interrupt(int irq, void *dev_instance)
+{
+ struct ata_host *host = dev_instance;
+ struct pci_dev *pdev = to_pci_dev(host->dev);
+ unsigned int i;
+ unsigned int handled = 0;
+ unsigned long flags;
+ static const u8 irq_reg[2] = { CFR, ARTTIM23 };
+ static const u8 irq_mask[2] = { 1 << 2, 1 << 4 };
+
+ /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
+ spin_lock_irqsave(&host->lock, flags);
+
+ for (i = 0; i < host->n_ports; i++) {
+ struct ata_port *ap;
+ u8 reg;
+
+ pci_read_config_byte(pdev, irq_reg[i], ®);
+ ap = host->ports[i];
+ if (ap && (reg & irq_mask[i]) &&
+ !(ap->flags & ATA_FLAG_DISABLED)) {
+ struct ata_queued_cmd *qc;
+
+ qc = ata_qc_from_tag(ap, ap->link.active_tag);
+ if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
+ (qc->flags & ATA_QCFLAG_ACTIVE))
+ handled |= ata_sff_host_intr(ap, qc);
+ }
+ }
+
+ spin_unlock_irqrestore(&host->lock, flags);