USB: Au1xxx-usb: suspend/resume support.

Copy the OHCI/EHCI PM callbacks of the PCI implementation since
they work equally well on Au1xxx hardware.

Tested on Au1200.

Signed-off-by: Manuel Lauss <mano@roarinelk.homelinux.net>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 155 insertions, 19 deletions

diff --git a/drivers/usb/host/ehci-au1xxx.c b/drivers/usb/host/ehci-au1xxx.c
index 12ed80684ad1..bf69f4739107 100644
--- a/drivers/usb/host/ehci-au1xxx.c
+++ b/drivers/usb/host/ehci-au1xxx.c
@@ -195,29 +195,124 @@ static int ehci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
         return 0;
 }
 
- /*TBD*/
-/*static int ehci_hcd_au1xxx_drv_suspend(struct device *dev)
+#ifdef CONFIG_PM
+static int ehci_hcd_au1xxx_drv_suspend(struct platform_device *pdev,
+                                        pm_message_t message)
 {
-        struct platform_device *pdev = to_platform_device(dev);
-        struct usb_hcd *hcd = dev_get_drvdata(dev);
+        struct usb_hcd *hcd = platform_get_drvdata(pdev);
+        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+        unsigned long flags;
+        int rc;
 
         return 0;
+        rc = 0;
+
+        if (time_before(jiffies, ehci->next_statechange))
+                msleep(10);
+
+        /* Root hub was already suspended. Disable irq emission and
+         * mark HW unaccessible, bail out if RH has been resumed. Use
+         * the spinlock to properly synchronize with possible pending
+         * RH suspend or resume activity.
+         *
+         * This is still racy as hcd->state is manipulated outside of
+         * any locks =P But that will be a different fix.
+         */
+        spin_lock_irqsave(&ehci->lock, flags);
+        if (hcd->state != HC_STATE_SUSPENDED) {
+                rc = -EINVAL;
+                goto bail;
+        }
+        ehci_writel(ehci, 0, &ehci->regs->intr_enable);
+        (void)ehci_readl(ehci, &ehci->regs->intr_enable);
+
+        /* make sure snapshot being resumed re-enumerates everything */
+        if (message.event == PM_EVENT_PRETHAW) {
+                ehci_halt(ehci);
+                ehci_reset(ehci);
+        }
+
+        clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+
+        au1xxx_stop_ehc();
+
+bail:
+        spin_unlock_irqrestore(&ehci->lock, flags);
+
+        // could save FLADJ in case of Vaux power loss
+        // ... we'd only use it to handle clock skew
+
+        return rc;
 }
-static int ehci_hcd_au1xxx_drv_resume(struct device *dev)
+
+
+static int ehci_hcd_au1xxx_drv_resume(struct platform_device *pdev)
 {
-        struct platform_device *pdev = to_platform_device(dev);
-        struct usb_hcd *hcd = dev_get_drvdata(dev);
+        struct usb_hcd *hcd = platform_get_drvdata(pdev);
+        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+
+        au1xxx_start_ehc();
+
+        // maybe restore FLADJ
+
+        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 CF is still set, we maintained PCI Vaux power.
+         * Just undo the effect of ehci_pci_suspend().
+         */
+        if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
+                int     mask = INTR_MASK;
+
+                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;
+        }
+
+        ehci_dbg(ehci, "lost power, restarting\n");
+        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.
+         */
+        (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 ehci_hcd_au1xxx_drv_suspend NULL
+#define ehci_hcd_au1xxx_drv_resume NULL
+#endif
 
 static struct platform_driver ehci_hcd_au1xxx_driver = {
         .probe          = ehci_hcd_au1xxx_drv_probe,
         .remove         = ehci_hcd_au1xxx_drv_remove,
         .shutdown       = usb_hcd_platform_shutdown,
-        /*.suspend      = ehci_hcd_au1xxx_drv_suspend, */
-        /*.resume       = ehci_hcd_au1xxx_drv_resume, */
+        .suspend        = ehci_hcd_au1xxx_drv_suspend,
+        .resume         = ehci_hcd_au1xxx_drv_resume,
         .driver = {
                 .name   = "au1xxx-ehci",
                 .owner  = THIS_MODULE,
diff --git a/drivers/usb/host/ohci-au1xxx.c b/drivers/usb/host/ohci-au1xxx.c
index 29c970ad487a..c0948008fe3d 100644
--- a/drivers/usb/host/ohci-au1xxx.c
+++ b/drivers/usb/host/ohci-au1xxx.c
@@ -248,27 +248,68 @@ static int ohci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
         return 0;
 }
 
-        /*TBD*/
-/*static int ohci_hcd_au1xxx_drv_suspend(struct platform_device *dev)
+#ifdef CONFIG_PM
+static int ohci_hcd_au1xxx_drv_suspend(struct platform_device *pdev,
+                                        pm_message_t message)
 {
-        struct usb_hcd *hcd = platform_get_drvdata(dev);
+        struct usb_hcd *hcd = platform_get_drvdata(pdev);
+        struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+        unsigned long flags;
+        int rc;
+
+        rc = 0;
+
+        /* Root hub was already suspended. Disable irq emission and
+         * mark HW unaccessible, bail out if RH has been resumed. Use
+         * the spinlock to properly synchronize with possible pending
+         * RH suspend or resume activity.
+         *
+         * This is still racy as hcd->state is manipulated outside of
+         * any locks =P But that will be a different fix.
+         */
+        spin_lock_irqsave(&ohci->lock, flags);
+        if (hcd->state != HC_STATE_SUSPENDED) {
+                rc = -EINVAL;
+                goto bail;
+        }
+        ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
+        (void)ohci_readl(ohci, &ohci->regs->intrdisable);
 
-        return 0;
+        /* make sure snapshot being resumed re-enumerates everything */
+        if (message.event == PM_EVENT_PRETHAW)
+                ohci_usb_reset(ohci);
+
+        clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+
+        au1xxx_stop_ohc();
+bail:
+        spin_unlock_irqrestore(&ohci->lock, flags);
+
+        return rc;
 }
-static int ohci_hcd_au1xxx_drv_resume(struct platform_device *dev)
+
+static int ohci_hcd_au1xxx_drv_resume(struct platform_device *pdev)
 {
-        struct usb_hcd *hcd = platform_get_drvdata(dev);
+        struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+        au1xxx_start_ohc();
+
+        set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+        ohci_finish_controller_resume(hcd);
 
         return 0;
 }
-*/
+#else
+#define ohci_hcd_au1xxx_drv_suspend NULL
+#define ohci_hcd_au1xxx_drv_resume NULL
+#endif
 
 static struct platform_driver ohci_hcd_au1xxx_driver = {
         .probe          = ohci_hcd_au1xxx_drv_probe,
         .remove         = ohci_hcd_au1xxx_drv_remove,
         .shutdown       = usb_hcd_platform_shutdown,
-        /*.suspend      = ohci_hcd_au1xxx_drv_suspend, */
-        /*.resume       = ohci_hcd_au1xxx_drv_resume, */
+        .suspend        = ohci_hcd_au1xxx_drv_suspend,
+        .resume         = ohci_hcd_au1xxx_drv_resume,
         .driver         = {
                 .name   = "au1xxx-ohci",
                 .owner  = THIS_MODULE,