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authorBrian Norris <computersforpeace@gmail.com>2011-11-18 11:10:10 -0800
committerJeff Garzik <jgarzik@redhat.com>2012-01-08 19:14:59 -0500
commit17ab594fa5f6c766a3daf304d2e6b643f863c24c (patch)
treefe562c7fcd1100a1bc3b90f912813b77e5b37972 /drivers/ata
parent80a9c430007b489823bc1b5300f4a1ba39ca1ef9 (diff)
downloadlinux-17ab594fa5f6c766a3daf304d2e6b643f863c24c.tar.bz2
ahci: platform support for suspend/resume
Add platform hooks for custom suspend() and resume() functions. The generic suspend/resume code in drivers/ata/ahci_platform.c is adapted from the PCI version in drivers/ata/ahci.c. Signed-off-by: Brian Norris <computersforpeace@gmail.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/ahci_platform.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
index 43b875810d1b..48be4e189163 100644
--- a/drivers/ata/ahci_platform.c
+++ b/drivers/ata/ahci_platform.c
@@ -202,6 +202,71 @@ static int __devexit ahci_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM
+static int ahci_suspend(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;
+ void __iomem *mmio = hpriv->mmio;
+ u32 ctl;
+ int rc;
+
+ if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
+ dev_err(dev, "firmware update required for suspend/resume\n");
+ return -EIO;
+ }
+
+ /*
+ * 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 */
+
+ rc = ata_host_suspend(host, PMSG_SUSPEND);
+ if (rc)
+ return rc;
+
+ if (pdata && pdata->suspend)
+ return pdata->suspend(dev);
+ return 0;
+}
+
+static int ahci_resume(struct device *dev)
+{
+ struct ahci_platform_data *pdata = dev_get_platdata(dev);
+ struct ata_host *host = dev_get_drvdata(dev);
+ int rc;
+
+ if (pdata && pdata->resume) {
+ rc = pdata->resume(dev);
+ if (rc)
+ return rc;
+ }
+
+ if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
+ rc = ahci_reset_controller(host);
+ if (rc)
+ return rc;
+
+ ahci_init_controller(host);
+ }
+
+ ata_host_resume(host);
+
+ return 0;
+}
+
+static struct dev_pm_ops ahci_pm_ops = {
+ .suspend = &ahci_suspend,
+ .resume = &ahci_resume,
+};
+#endif
+
static const struct of_device_id ahci_of_match[] = {
{ .compatible = "calxeda,hb-ahci", },
{},
@@ -214,6 +279,9 @@ static struct platform_driver ahci_driver = {
.name = "ahci",
.owner = THIS_MODULE,
.of_match_table = ahci_of_match,
+#ifdef CONFIG_PM
+ .pm = &ahci_pm_ops,
+#endif
},
.id_table = ahci_devtype,
};