[PATCH] ahci: implement Power Management support

Implement power management support.

Original implementation is from Zhao, Forrest <forrest.zhao@intel.com>

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Zhao, Forrest <forrest.zhao@intel.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c
index a9e0c5f79096e31a1aea037715b221b18d883791..909a4dc79d08f4a8aa3a3afe7411d978c2e584ea 100644 (file)
--- a/drivers/scsi/ahci.c
+++ b/drivers/scsi/ahci.c
@@ -215,6 +215,10 @@ static void ahci_freeze(struct ata_port *ap);
 static void ahci_thaw(struct ata_port *ap);
 static void ahci_error_handler(struct ata_port *ap);
 static void ahci_post_internal_cmd(struct ata_queued_cmd *qc);
+static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg);
+static int ahci_port_resume(struct ata_port *ap);
+static int ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
+static int ahci_pci_device_resume(struct pci_dev *pdev);
 static void ahci_remove_one (struct pci_dev *pdev);
 
 static struct scsi_host_template ahci_sht = {
@@ -234,6 +238,8 @@ static struct scsi_host_template ahci_sht = {
        .slave_configure        = ata_scsi_slave_config,
        .slave_destroy          = ata_scsi_slave_destroy,
        .bios_param             = ata_std_bios_param,
+       .suspend                = ata_scsi_device_suspend,
+       .resume                 = ata_scsi_device_resume,
 };
 
 static const struct ata_port_operations ahci_ops = {
@@ -260,6 +266,9 @@ static const struct ata_port_operations ahci_ops = {
        .error_handler          = ahci_error_handler,
        .post_internal_cmd      = ahci_post_internal_cmd,
 
+       .port_suspend           = ahci_port_suspend,
+       .port_resume            = ahci_port_resume,
+
        .port_start             = ahci_port_start,
        .port_stop              = ahci_port_stop,
 };
@@ -361,6 +370,8 @@ static struct pci_driver ahci_pci_driver = {
        .name                   = DRV_NAME,
        .id_table               = ahci_pci_tbl,
        .probe                  = ahci_init_one,
+       .suspend                = ahci_pci_device_suspend,
+       .resume                 = ahci_pci_device_resume,
        .remove                 = ahci_remove_one,
 };
 
@@ -1199,6 +1210,79 @@ static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)
        }
 }
 
+static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg)
+{
+       struct ahci_host_priv *hpriv = ap->host_set->private_data;
+       struct ahci_port_priv *pp = ap->private_data;
+       void __iomem *mmio = ap->host_set->mmio_base;
+       void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
+       const char *emsg = NULL;
+       int rc;
+
+       rc = ahci_deinit_port(port_mmio, hpriv->cap, &emsg);
+       if (rc) {
+               ata_port_printk(ap, KERN_ERR, "%s (%d)\n", emsg, rc);
+               ahci_init_port(port_mmio, hpriv->cap,
+                              pp->cmd_slot_dma, pp->rx_fis_dma);
+       }
+
+       return rc;
+}
+
+static int ahci_port_resume(struct ata_port *ap)
+{
+       struct ahci_port_priv *pp = ap->private_data;
+       struct ahci_host_priv *hpriv = ap->host_set->private_data;
+       void __iomem *mmio = ap->host_set->mmio_base;
+       void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
+
+       ahci_init_port(port_mmio, hpriv->cap, pp->cmd_slot_dma, pp->rx_fis_dma);
+
+       return 0;
+}
+
+static int ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
+{
+       struct ata_host_set *host_set = dev_get_drvdata(&pdev->dev);
+       void __iomem *mmio = host_set->mmio_base;
+       u32 ctl;
+
+       if (mesg.event == PM_EVENT_SUSPEND) {
+               /* AHCI spec rev1.1 section 8.3.3:
+                * Software must disable interrupts prior to requesting a
+                * transition of the HBA to D3 state.
+                */
+               ctl = readl(mmio + HOST_CTL);
+               ctl &= ~HOST_IRQ_EN;
+               writel(ctl, mmio + HOST_CTL);
+               readl(mmio + HOST_CTL); /* flush */
+       }
+
+       return ata_pci_device_suspend(pdev, mesg);
+}
+
+static int ahci_pci_device_resume(struct pci_dev *pdev)
+{
+       struct ata_host_set *host_set = dev_get_drvdata(&pdev->dev);
+       struct ahci_host_priv *hpriv = host_set->private_data;
+       void __iomem *mmio = host_set->mmio_base;
+       int rc;
+
+       ata_pci_device_do_resume(pdev);
+
+       if (pdev->dev.power.power_state.event == PM_EVENT_SUSPEND) {
+               rc = ahci_reset_controller(mmio, pdev);
+               if (rc)
+                       return rc;
+
+               ahci_init_controller(mmio, pdev, host_set->n_ports, hpriv->cap);
+       }
+
+       ata_host_set_resume(host_set);
+
+       return 0;
+}
+
 static int ahci_port_start(struct ata_port *ap)
 {
        struct device *dev = ap->host_set->dev;