This patch adds power management support such as suspend and resume
functions.
Signed-off-by: Jingoo Han <jg1.han@xxxxxxxxxxx>
---
drivers/usb/host/ehci-s5p.c | 95 +++++++++++++++++++++++++++++++++++++++++++
1 files changed, 95 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/host/ehci-s5p.c b/drivers/usb/host/ehci-s5p.c
index e3374c8..50e5cf9 100644
--- a/drivers/usb/host/ehci-s5p.c
+++ b/drivers/usb/host/ehci-s5p.c
@@ -189,6 +189,100 @@ static void s5p_ehci_shutdown(struct platform_device *pdev)
hcd->driver->shutdown(hcd);
}
+#ifdef CONFIG_PM
+static int s5p_ehci_suspend(struct device *dev)
+{
+ struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev);
+ struct usb_hcd *hcd = s5p_ehci->hcd;
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ struct platform_device *pdev = to_platform_device(dev);
+ struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
+ unsigned long flags;
+ int rc = 0;
+
+ if (time_before(jiffies, ehci->next_statechange))
+ msleep(20);
+
+ /*
+ * 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.
+ */
+ ehci_prepare_ports_for_controller_suspend(ehci, device_may_wakeup(dev));
+ spin_lock_irqsave(&ehci->lock, flags);
+ ehci_writel(ehci, 0, &ehci->regs->intr_enable);
+ (void)ehci_readl(ehci, &ehci->regs->intr_enable);
+
+ clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+ spin_unlock_irqrestore(&ehci->lock, flags);
+
+ if (pdata && pdata->phy_exit)
+ pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
+
+ return rc;
+}
+
+static int s5p_ehci_resume(struct device *dev)
+{
+ struct s5p_ehci_hcd *s5p_ehci = dev_get_drvdata(dev);
+ struct usb_hcd *hcd = s5p_ehci->hcd;
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ struct platform_device *pdev = to_platform_device(dev);
+ struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
+
+ if (pdata->phy_init)
+ pdata->phy_init(pdev, S5P_USB_PHY_HOST);
+
+ if (time_before(jiffies, ehci->next_statechange))
+ msleep(100);
+
+ /* Mark hardware accessible again as we are out of D3 state by now */
+ set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+
+ 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);
+
+ (void) ehci_halt(ehci);
+ (void) 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);
+
+ hcd->state = HC_STATE_SUSPENDED;
+
+ return 0;
+}
+#else
+#define s5p_ehci_suspend NULL
+#define s5p_ehci_resume NULL
+#endif
+
+static const struct dev_pm_ops s5p_ehci_pm_ops = {
+ .suspend = s5p_ehci_suspend,
+ .resume = s5p_ehci_resume,
+};
+
static struct platform_driver s5p_ehci_driver = {
.probe = s5p_ehci_probe,
.remove = __devexit_p(s5p_ehci_remove),
@@ -196,6 +290,7 @@ static struct platform_driver s5p_ehci_driver = {
.driver = {
.name = "s5p-ehci",
.owner = THIS_MODULE,
+ .pm = &s5p_ehci_pm_ops,
}
};
--
1.7.1
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