Merge branch 'post-2.6.15' of git://brick.kernel.dk/data/git/linux-2.6-block

[linux-2.6-omap-h63xx.git] / drivers / scsi / libata-core.c

diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index bdfb0a88cd6f675975cc44a172484c8e9085b2f2..f55b9b3f7b37f1e8b4ad71e8c9950d8a1f3a9797 100644 (file)
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -4173,6 +4173,96 @@ err_out:
  *     Inherited from caller.
  */
 
+/*
+ * Execute a 'simple' command, that only consists of the opcode 'cmd' itself,
+ * without filling any other registers
+ */
+static int ata_do_simple_cmd(struct ata_port *ap, struct ata_device *dev,
+                            u8 cmd)
+{
+       struct ata_taskfile tf;
+       int err;
+
+       ata_tf_init(ap, &tf, dev->devno);
+
+       tf.command = cmd;
+       tf.flags |= ATA_TFLAG_DEVICE;
+       tf.protocol = ATA_PROT_NODATA;
+
+       err = ata_exec_internal(ap, dev, &tf, DMA_NONE, NULL, 0);
+       if (err)
+               printk(KERN_ERR "%s: ata command failed: %d\n",
+                               __FUNCTION__, err);
+
+       return err;
+}
+
+static int ata_flush_cache(struct ata_port *ap, struct ata_device *dev)
+{
+       u8 cmd;
+
+       if (!ata_try_flush_cache(dev))
+               return 0;
+
+       if (ata_id_has_flush_ext(dev->id))
+               cmd = ATA_CMD_FLUSH_EXT;
+       else
+               cmd = ATA_CMD_FLUSH;
+
+       return ata_do_simple_cmd(ap, dev, cmd);
+}
+
+static int ata_standby_drive(struct ata_port *ap, struct ata_device *dev)
+{
+       return ata_do_simple_cmd(ap, dev, ATA_CMD_STANDBYNOW1);
+}
+
+static int ata_start_drive(struct ata_port *ap, struct ata_device *dev)
+{
+       return ata_do_simple_cmd(ap, dev, ATA_CMD_IDLEIMMEDIATE);
+}
+
+/**
+ *     ata_device_resume - wakeup a previously suspended devices
+ *
+ *     Kick the drive back into action, by sending it an idle immediate
+ *     command and making sure its transfer mode matches between drive
+ *     and host.
+ *
+ */
+int ata_device_resume(struct ata_port *ap, struct ata_device *dev)
+{
+       if (ap->flags & ATA_FLAG_SUSPENDED) {
+               ap->flags &= ~ATA_FLAG_SUSPENDED;
+               ata_set_mode(ap);
+       }
+       if (!ata_dev_present(dev))
+               return 0;
+       if (dev->class == ATA_DEV_ATA)
+               ata_start_drive(ap, dev);
+
+       return 0;
+}
+
+/**
+ *     ata_device_suspend - prepare a device for suspend
+ *
+ *     Flush the cache on the drive, if appropriate, then issue a
+ *     standbynow command.
+ *
+ */
+int ata_device_suspend(struct ata_port *ap, struct ata_device *dev)
+{
+       if (!ata_dev_present(dev))
+               return 0;
+       if (dev->class == ATA_DEV_ATA)
+               ata_flush_cache(ap, dev);
+
+       ata_standby_drive(ap, dev);
+       ap->flags |= ATA_FLAG_SUSPENDED;
+       return 0;
+}
+
 int ata_port_start (struct ata_port *ap)
 {
        struct device *dev = ap->host_set->dev;
@@ -4921,6 +5011,23 @@ int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
 
        return (tmp == bits->val) ? 1 : 0;
 }
+
+int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+       pci_save_state(pdev);
+       pci_disable_device(pdev);
+       pci_set_power_state(pdev, PCI_D3hot);
+       return 0;
+}
+
+int ata_pci_device_resume(struct pci_dev *pdev)
+{
+       pci_set_power_state(pdev, PCI_D0);
+       pci_restore_state(pdev);
+       pci_enable_device(pdev);
+       pci_set_master(pdev);
+       return 0;
+}
 #endif /* CONFIG_PCI */
 
 
@@ -5024,4 +5131,11 @@ EXPORT_SYMBOL_GPL(ata_pci_host_stop);
 EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
 EXPORT_SYMBOL_GPL(ata_pci_init_one);
 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
+EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
+EXPORT_SYMBOL_GPL(ata_pci_device_resume);
 #endif /* CONFIG_PCI */
+
+EXPORT_SYMBOL_GPL(ata_device_suspend);
+EXPORT_SYMBOL_GPL(ata_device_resume);
+EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
+EXPORT_SYMBOL_GPL(ata_scsi_device_resume);