USB: ehci-spear: Add PM support

This patch adds support for standby/S2R/hibernate for ehci-spear driver.

Signed-off-by: Deepak Sikri <deepak.sikri@st.com>
Signed-off-by: Pratyush Anand <pratyush.anand@st.com>
Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/ehci-spear.c b/drivers/usb/host/ehci-spear.c
index b115b0b..6e92855 100644 (file)
--- 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,
        }
 };