libata: bind the Linux device tree to the ACPI device tree

[~andy/linux] / drivers / ata / libata-acpi.c

diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index bb7c5f1085ccdfa997671520afc87c4f887eed39..b3025a7d71e3b402b1012a0920f4e49dbd7af3ea 100644 (file)
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -47,6 +47,39 @@ static void ata_acpi_clear_gtf(struct ata_device *dev)
        dev->gtf_cache = NULL;
 }
 
+static acpi_handle ap_acpi_handle(struct ata_port *ap)
+{
+       if (ap->flags & ATA_FLAG_ACPI_SATA)
+               return NULL;
+
+       /*
+        * If acpi bind operation has already happened, we can get the handle
+        * for the port by checking the corresponding scsi_host device's
+        * firmware node, otherwise we will need to find out the handle from
+        * its parent's acpi node.
+        */
+       if (ap->scsi_host)
+               return DEVICE_ACPI_HANDLE(&ap->scsi_host->shost_gendev);
+       else
+               return acpi_get_child(DEVICE_ACPI_HANDLE(ap->host->dev),
+                               ap->port_no);
+}
+
+static acpi_handle dev_acpi_handle(struct ata_device *dev)
+{
+       acpi_integer adr;
+       struct ata_port *ap = dev->link->ap;
+
+       if (ap->flags & ATA_FLAG_ACPI_SATA) {
+               if (!sata_pmp_attached(ap))
+                       adr = SATA_ADR(ap->port_no, NO_PORT_MULT);
+               else
+                       adr = SATA_ADR(ap->port_no, dev->link->pmp);
+               return acpi_get_child(DEVICE_ACPI_HANDLE(ap->host->dev), adr);
+       } else
+               return acpi_get_child(ap_acpi_handle(ap), dev->devno);
+}
+
 /**
  * ata_acpi_associate_sata_port - associate SATA port with ACPI objects
  * @ap: target SATA port
@@ -1018,3 +1051,107 @@ void ata_acpi_on_disable(struct ata_device *dev)
 {
        ata_acpi_clear_gtf(dev);
 }
+
+static int compat_pci_ata(struct ata_port *ap)
+{
+       struct device *dev = ap->tdev.parent;
+       struct pci_dev *pdev;
+
+       if (!is_pci_dev(dev))
+               return 0;
+
+       pdev = to_pci_dev(dev);
+
+       if ((pdev->class >> 8) != PCI_CLASS_STORAGE_SATA &&
+           (pdev->class >> 8) != PCI_CLASS_STORAGE_IDE)
+               return 0;
+
+       return 1;
+}
+
+static int ata_acpi_bind_host(struct ata_port *ap, acpi_handle *handle)
+{
+       if (ap->flags & ATA_FLAG_ACPI_SATA)
+               return -ENODEV;
+
+       *handle = acpi_get_child(DEVICE_ACPI_HANDLE(ap->tdev.parent),
+                       ap->port_no);
+
+       if (!*handle)
+               return -ENODEV;
+
+       return 0;
+}
+
+static int ata_acpi_bind_device(struct ata_port *ap, struct scsi_device *sdev,
+                               acpi_handle *handle)
+{
+       struct ata_device *ata_dev;
+
+       if (ap->flags & ATA_FLAG_ACPI_SATA)
+               ata_dev = &ap->link.device[sdev->channel];
+       else
+               ata_dev = &ap->link.device[sdev->id];
+
+       *handle = dev_acpi_handle(ata_dev);
+
+       if (!*handle)
+               return -ENODEV;
+
+       return 0;
+}
+
+static int is_ata_port(const struct device *dev)
+{
+       return dev->type == &ata_port_type;
+}
+
+static struct ata_port *dev_to_ata_port(struct device *dev)
+{
+       while (!is_ata_port(dev)) {
+               if (!dev->parent)
+                       return NULL;
+               dev = dev->parent;
+       }
+       return to_ata_port(dev);
+}
+
+static int ata_acpi_find_device(struct device *dev, acpi_handle *handle)
+{
+       struct ata_port *ap = dev_to_ata_port(dev);
+
+       if (!ap)
+               return -ENODEV;
+
+       if (!compat_pci_ata(ap))
+               return -ENODEV;
+
+       if (scsi_is_host_device(dev))
+               return ata_acpi_bind_host(ap, handle);
+       else if (scsi_is_sdev_device(dev)) {
+               struct scsi_device *sdev = to_scsi_device(dev);
+
+               return ata_acpi_bind_device(ap, sdev, handle);
+       } else
+               return -ENODEV;
+}
+
+static int ata_acpi_find_dummy(struct device *dev, acpi_handle *handle)
+{
+       return -ENODEV;
+}
+
+static struct acpi_bus_type ata_acpi_bus = {
+       .find_bridge = ata_acpi_find_dummy,
+       .find_device = ata_acpi_find_device,
+};
+
+int ata_acpi_register(void)
+{
+       return scsi_register_acpi_bus_type(&ata_acpi_bus);
+}
+
+void ata_acpi_unregister(void)
+{
+       scsi_unregister_acpi_bus_type(&ata_acpi_bus);
+}