diff options
Diffstat (limited to 'drivers/usb/host/ehci-spear.c')
| -rw-r--r-- | drivers/usb/host/ehci-spear.c | 83 |
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, } }; |