1 files changed, 81 insertions, 2 deletions

diff --git a/drivers/usb/host/ehci-spear.c b/drivers/usb/host/ehci-spear.c
index b115b0b76e33..6e928559169c 100644
--- a/drivers/usb/host/ehci-spear.c
+++ b/drivers/usb/host/ehci-spear.c
@@ -11,8 +11,10 @@
 * more details.
 */
 
-#include <linux/platform_device.h>
 #include <linux/clk.h>
+#include <linux/jiffies.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
 
 struct spear_ehci {
         struct ehci_hcd ehci;
@@ -90,6 +92,82 @@ static const struct hc_driver ehci_spear_hc_driver = {
         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
 };
 
+#ifdef CONFIG_PM
+static int ehci_spear_drv_suspend(struct device *dev)
+{
+        struct usb_hcd *hcd = dev_get_drvdata(dev);
+        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+        unsigned long flags;
+        int rc = 0;
+
+        if (time_before(jiffies, ehci->next_statechange))
+                msleep(10);
+
+        /*
+         * Root hub was already suspended. Disable irq emission and mark HW
+         * unaccessible. The PM and USB cores make sure that the root hub is
+         * either suspended or stopped.
+         */
+        spin_lock_irqsave(&ehci->lock, flags);
+        ehci_prepare_ports_for_controller_suspend(ehci, device_may_wakeup(dev));
+        ehci_writel(ehci, 0, &ehci->regs->intr_enable);
+        ehci_readl(ehci, &ehci->regs->intr_enable);
+        spin_unlock_irqrestore(&ehci->lock, flags);
+
+        return rc;
+}
+
+static int ehci_spear_drv_resume(struct device *dev)
+{
+        struct usb_hcd *hcd = dev_get_drvdata(dev);
+        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+
+        if (time_before(jiffies, ehci->next_statechange))
+                msleep(100);
+
+        if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
+                int mask = INTR_MASK;
+
+                ehci_prepare_ports_for_controller_resume(ehci);
+
+                if (!hcd->self.root_hub->do_remote_wakeup)
+                        mask &= ~STS_PCD;
+
+                ehci_writel(ehci, mask, &ehci->regs->intr_enable);
+                ehci_readl(ehci, &ehci->regs->intr_enable);
+                return 0;
+        }
+
+        usb_root_hub_lost_power(hcd->self.root_hub);
+
+        /*
+         * Else reset, to cope with power loss or flush-to-storage style
+         * "resume" having let BIOS kick in during reboot.
+         */
+        ehci_halt(ehci);
+        ehci_reset(ehci);
+
+        /* emptying the schedule aborts any urbs */
+        spin_lock_irq(&ehci->lock);
+        if (ehci->reclaim)
+                end_unlink_async(ehci);
+
+        ehci_work(ehci);
+        spin_unlock_irq(&ehci->lock);
+
+        ehci_writel(ehci, ehci->command, &ehci->regs->command);
+        ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
+        ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
+
+        /* here we "know" root ports should always stay powered */
+        ehci_port_power(ehci, 1);
+        return 0;
+}
+#endif /* CONFIG_PM */
+
+static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend,
+                ehci_spear_drv_resume);
+
 static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
 {
         struct usb_hcd *hcd ;
@@ -205,7 +283,8 @@ static struct platform_driver spear_ehci_hcd_driver = {
         .shutdown       = usb_hcd_platform_shutdown,
         .driver         = {
                 .name = "spear-ehci",
-                .bus = &platform_bus_type
+                .bus = &platform_bus_type,
+                .pm = &ehci_spear_pm_ops,
         }
 };