forked from mirrors/linux
libata: bind the Linux device tree to the ACPI device tree
Associate the ACPI device tree and libata devices. This patch uses the generic ACPI glue framework to do so. Signed-off-by: Matthew Garrett <mjg@redhat.com> Signed-off-by: Holger Macht <holger@homac.de> Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Matthew Garrett
Jeff Garzik
parent
de50ada55b
commit
6b66d95895
4 changed files with 148 additions and 4 deletions
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@ -39,6 +39,7 @@ int register_acpi_bus_type(struct acpi_bus_type *type)
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}
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return -ENODEV;
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}
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EXPORT_SYMBOL(register_acpi_bus_type);
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int unregister_acpi_bus_type(struct acpi_bus_type *type)
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{
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@ -54,6 +55,7 @@ int unregister_acpi_bus_type(struct acpi_bus_type *type)
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}
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return -ENODEV;
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}
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EXPORT_SYMBOL(unregister_acpi_bus_type);
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static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
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{
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@ -69,7 +71,6 @@ static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
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up_read(&bus_type_sem);
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return ret;
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}
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EXPORT_SYMBOL_GPL(register_acpi_bus_type);
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static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
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{
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@ -86,7 +87,6 @@ static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
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up_read(&bus_type_sem);
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return ret;
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}
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EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);
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/* Get device's handler per its address under its parent */
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struct acpi_find_child {
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@ -47,6 +47,39 @@ static void ata_acpi_clear_gtf(struct ata_device *dev)
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dev->gtf_cache = NULL;
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}
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static acpi_handle ap_acpi_handle(struct ata_port *ap)
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{
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if (ap->flags & ATA_FLAG_ACPI_SATA)
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return NULL;
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/*
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* If acpi bind operation has already happened, we can get the handle
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* for the port by checking the corresponding scsi_host device's
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* firmware node, otherwise we will need to find out the handle from
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* its parent's acpi node.
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*/
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if (ap->scsi_host)
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return DEVICE_ACPI_HANDLE(&ap->scsi_host->shost_gendev);
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else
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return acpi_get_child(DEVICE_ACPI_HANDLE(ap->host->dev),
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ap->port_no);
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}
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static acpi_handle dev_acpi_handle(struct ata_device *dev)
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{
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acpi_integer adr;
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struct ata_port *ap = dev->link->ap;
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if (ap->flags & ATA_FLAG_ACPI_SATA) {
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if (!sata_pmp_attached(ap))
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adr = SATA_ADR(ap->port_no, NO_PORT_MULT);
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else
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adr = SATA_ADR(ap->port_no, dev->link->pmp);
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return acpi_get_child(DEVICE_ACPI_HANDLE(ap->host->dev), adr);
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} else
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return acpi_get_child(ap_acpi_handle(ap), dev->devno);
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}
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/**
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* ata_acpi_associate_sata_port - associate SATA port with ACPI objects
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* @ap: target SATA port
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@ -1018,3 +1051,107 @@ void ata_acpi_on_disable(struct ata_device *dev)
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{
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ata_acpi_clear_gtf(dev);
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}
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static int compat_pci_ata(struct ata_port *ap)
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{
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struct device *dev = ap->tdev.parent;
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struct pci_dev *pdev;
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if (!is_pci_dev(dev))
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return 0;
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pdev = to_pci_dev(dev);
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if ((pdev->class >> 8) != PCI_CLASS_STORAGE_SATA &&
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(pdev->class >> 8) != PCI_CLASS_STORAGE_IDE)
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return 0;
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return 1;
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}
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static int ata_acpi_bind_host(struct ata_port *ap, acpi_handle *handle)
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{
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if (ap->flags & ATA_FLAG_ACPI_SATA)
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return -ENODEV;
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*handle = acpi_get_child(DEVICE_ACPI_HANDLE(ap->tdev.parent),
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ap->port_no);
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if (!*handle)
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return -ENODEV;
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return 0;
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}
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static int ata_acpi_bind_device(struct ata_port *ap, struct scsi_device *sdev,
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acpi_handle *handle)
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{
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struct ata_device *ata_dev;
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if (ap->flags & ATA_FLAG_ACPI_SATA)
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ata_dev = &ap->link.device[sdev->channel];
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else
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ata_dev = &ap->link.device[sdev->id];
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*handle = dev_acpi_handle(ata_dev);
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if (!*handle)
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return -ENODEV;
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return 0;
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}
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static int is_ata_port(const struct device *dev)
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{
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return dev->type == &ata_port_type;
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}
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static struct ata_port *dev_to_ata_port(struct device *dev)
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{
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while (!is_ata_port(dev)) {
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if (!dev->parent)
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return NULL;
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dev = dev->parent;
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}
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return to_ata_port(dev);
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}
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static int ata_acpi_find_device(struct device *dev, acpi_handle *handle)
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{
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struct ata_port *ap = dev_to_ata_port(dev);
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if (!ap)
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return -ENODEV;
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if (!compat_pci_ata(ap))
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return -ENODEV;
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if (scsi_is_host_device(dev))
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return ata_acpi_bind_host(ap, handle);
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else if (scsi_is_sdev_device(dev)) {
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struct scsi_device *sdev = to_scsi_device(dev);
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return ata_acpi_bind_device(ap, sdev, handle);
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} else
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return -ENODEV;
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}
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static int ata_acpi_find_dummy(struct device *dev, acpi_handle *handle)
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{
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return -ENODEV;
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}
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static struct acpi_bus_type ata_acpi_bus = {
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.find_bridge = ata_acpi_find_dummy,
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.find_device = ata_acpi_find_device,
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};
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int ata_acpi_register(void)
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{
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return scsi_register_acpi_bus_type(&ata_acpi_bus);
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}
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void ata_acpi_unregister(void)
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{
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scsi_unregister_acpi_bus_type(&ata_acpi_bus);
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}
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@ -5288,8 +5288,6 @@ static int ata_port_request_pm(struct ata_port *ap, pm_message_t mesg,
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return rc;
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}
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#define to_ata_port(d) container_of(d, struct ata_port, tdev)
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static int ata_port_suspend_common(struct device *dev, pm_message_t mesg)
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{
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struct ata_port *ap = to_ata_port(dev);
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@ -6513,6 +6511,8 @@ static int __init ata_init(void)
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ata_parse_force_param();
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ata_acpi_register();
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rc = ata_sff_init();
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if (rc) {
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kfree(ata_force_tbl);
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@ -6539,6 +6539,7 @@ static void __exit ata_exit(void)
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ata_release_transport(ata_scsi_transport_template);
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libata_transport_exit();
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ata_sff_exit();
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ata_acpi_unregister();
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kfree(ata_force_tbl);
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}
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@ -107,6 +107,8 @@ extern const char *sata_spd_string(unsigned int spd);
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extern int ata_port_probe(struct ata_port *ap);
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extern void __ata_port_probe(struct ata_port *ap);
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#define to_ata_port(d) container_of(d, struct ata_port, tdev)
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/* libata-acpi.c */
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#ifdef CONFIG_ATA_ACPI
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extern unsigned int ata_acpi_gtf_filter;
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@ -119,6 +121,8 @@ extern void ata_acpi_on_resume(struct ata_port *ap);
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extern int ata_acpi_on_devcfg(struct ata_device *dev);
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extern void ata_acpi_on_disable(struct ata_device *dev);
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extern void ata_acpi_set_state(struct ata_port *ap, pm_message_t state);
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extern int ata_acpi_register(void);
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extern void ata_acpi_unregister(void);
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#else
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static inline void ata_acpi_associate_sata_port(struct ata_port *ap) { }
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static inline void ata_acpi_associate(struct ata_host *host) { }
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@ -129,6 +133,8 @@ static inline int ata_acpi_on_devcfg(struct ata_device *dev) { return 0; }
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static inline void ata_acpi_on_disable(struct ata_device *dev) { }
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static inline void ata_acpi_set_state(struct ata_port *ap,
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pm_message_t state) { }
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static inline int ata_acpi_register(void) { return 0; }
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static void ata_acpi_unregister(void) { }
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#endif
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/* libata-scsi.c */
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