Signed-off-by: JiSheng Zhang <jszhang3@xxxxxxxxx>
---
drivers/ata/ahci_platform.c | 52 +++++++++++++++++++++++++++++++++++++++++++
1 files changed, 52 insertions(+), 0 deletions(-)
diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
index 45edba9..b8ffc02 100644
--- a/drivers/ata/ahci_platform.c
+++ b/drivers/ata/ahci_platform.c
@@ -202,11 +202,63 @@ static int __devexit ahci_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM
+static int ahci_suspend(struct device *dev)
+{
+ struct ata_host *host = dev_get_drvdata(dev);
+ struct ahci_host_priv *hpriv = host->private_data;
+ void __iomem *mmio = hpriv->mmio;
+ u32 ctl;
+
+ /* 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_host_suspend(host, PMSG_SUSPEND);
+}
+
+static int ahci_resume(struct device *dev)
+{
+ struct ahci_platform_data *pdata = dev_get_platdata(dev);
+ struct ata_host *host = dev_get_drvdata(dev);
+ struct ahci_host_priv *hpriv = host->private_data;
+ int rc;
+
+ if (pdata && pdata->init) {
+ rc = pdata->init(dev, hpriv->mmio);
+ if (rc)
+ return rc;
+ }
+
+ rc = ahci_reset_controller(host);
+ if (rc)
+ return rc;
+
+ ahci_init_controller(host);
+ ata_host_resume(host);
+
+ return 0;
+}
+
+static const struct dev_pm_ops ahci_pm_ops = {
+ .suspend = ahci_suspend,
+ .resume = ahci_resume,
+};
+#endif
+
static struct platform_driver ahci_driver = {
.remove = __devexit_p(ahci_remove),
.driver = {
.name = "ahci",
.owner = THIS_MODULE,
+#ifdef CONFIG_PM
+ .pm = &ahci_pm_ops,
+#endif
},
.id_table = ahci_devtype,
};
--
1.7.6.3
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