Commit 1acb30ef authored by Jingoo Han's avatar Jingoo Han Committed by Greg Kroah-Hartman
Browse files

USB: ehci-s5p: add PM support 



This patch adds power management support such as suspend and resume
functions.

Signed-off-by: default avatarJingoo Han <jg1.han@samsung.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent db383d69

drivers/usb/host/ehci-s5p.c

+95 −0
Original line number Diff line number Diff line
@@ -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 && 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,

	}

};