+/**
+ * ata_pci_activate_sff_host - start SFF host, request IRQ and register it
+ * @host: target SFF ATA host
+ * @irq_handler: irq_handler used when requesting IRQ(s)
+ * @sht: scsi_host_template to use when registering the host
+ *
+ * This is the counterpart of ata_host_activate() for SFF ATA
+ * hosts. This separate helper is necessary because SFF hosts
+ * use two separate interrupts in legacy mode.
+ *
+ * LOCKING:
+ * Inherited from calling layer (may sleep).
+ *
+ * RETURNS:
+ * 0 on success, -errno otherwise.
+ */
+int ata_pci_activate_sff_host(struct ata_host *host,
+ irq_handler_t irq_handler,
+ struct scsi_host_template *sht)
+{
+ struct device *dev = host->dev;
+ struct pci_dev *pdev = to_pci_dev(dev);
+ const char *drv_name = dev_driver_string(host->dev);
+ int legacy_mode = 0, rc;
+
+ rc = ata_host_start(host);
+ if (rc)
+ return rc;
+
+ if ((pdev->class >> 8) == PCI_CLASS_STORAGE_IDE) {
+ u8 tmp8, mask;
+
+ /* TODO: What if one channel is in native mode ... */
+ pci_read_config_byte(pdev, PCI_CLASS_PROG, &tmp8);
+ mask = (1 << 2) | (1 << 0);
+ if ((tmp8 & mask) != mask)
+ legacy_mode = 1;
+#if defined(CONFIG_NO_ATA_LEGACY)
+ /* Some platforms with PCI limits cannot address compat
+ port space. In that case we punt if their firmware has
+ left a device in compatibility mode */
+ if (legacy_mode) {
+ printk(KERN_ERR "ata: Compatibility mode ATA is not supported on this platform, skipping.\n");
+ return -EOPNOTSUPP;
+ }
+#endif
+ }
+
+ if (!devres_open_group(dev, NULL, GFP_KERNEL))
+ return -ENOMEM;
+
+ if (!legacy_mode && pdev->irq) {
+ rc = devm_request_irq(dev, pdev->irq, irq_handler,
+ IRQF_SHARED, drv_name, host);
+ if (rc)
+ goto out;
+
+ ata_port_desc(host->ports[0], "irq %d", pdev->irq);
+ ata_port_desc(host->ports[1], "irq %d", pdev->irq);
+ } else if (legacy_mode) {
+ if (!ata_port_is_dummy(host->ports[0])) {
+ rc = devm_request_irq(dev, ATA_PRIMARY_IRQ(pdev),
+ irq_handler, IRQF_SHARED,
+ drv_name, host);
+ if (rc)
+ goto out;
+
+ ata_port_desc(host->ports[0], "irq %d",
+ ATA_PRIMARY_IRQ(pdev));
+ }
+
+ if (!ata_port_is_dummy(host->ports[1])) {
+ rc = devm_request_irq(dev, ATA_SECONDARY_IRQ(pdev),
+ irq_handler, IRQF_SHARED,
+ drv_name, host);
+ if (rc)
+ goto out;
+
+ ata_port_desc(host->ports[1], "irq %d",
+ ATA_SECONDARY_IRQ(pdev));
+ }
+ }
+
+ rc = ata_host_register(host, sht);
+ out:
+ if (rc == 0)
+ devres_remove_group(dev, NULL);
+ else
+ devres_release_group(dev, NULL);
+
+ return rc;
+}
+