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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>
hifive-unleashed-5.1
Deepak Sikri 2012-02-24 14:49:31 +05:30 committed by Greg Kroah-Hartman
parent 4898e07174
commit 8c1b369394
1 changed files with 81 additions and 2 deletions
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83
drivers/usb/host/ehci-spear.c
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@ -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,
}
};