[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>

1 files changed, 84 insertions, 0 deletions

diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c
index a9e0c5f79096..909a4dc79d08 100644
--- 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;