MLK-10102-4 usb: chipidea: host: support resume usb from power lost

This patch implements the suspend and resume routine for save and restore
registers of ehci, this is to support host resume from a system sleep with
power lost.

Acked-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Li Jun <b47624@freescale.com>
(cherry picked from commit ab8e5ef4265b706b47b2e3ee36e079d63a3f0bce)
(cherry picked from commit 31039b54ec0bd2429f758626c0abfc9898c5aa82)

diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
index 19b6f7a..9e14d75 100644 (file)
--- a/drivers/usb/chipidea/ci.h
+++ b/drivers/usb/chipidea/ci.h
@@ -252,6 +252,17 @@ struct ci_hdrc {
        bool                            in_lpm;
        bool                            wakeup_int;
        enum ci_revision                rev;
+       /* register save area for suspend&resume */
+       u32                             pm_command;
+       u32                             pm_status;
+       u32                             pm_intr_enable;
+       u32                             pm_frame_index;
+       u32                             pm_segment;
+       u32                             pm_frame_list;
+       u32                             pm_async_next;
+       u32                             pm_configured_flag;
+       u32                             pm_portsc;
+       u32                             pm_usbmode;
 };
 
 static inline struct ci_role_driver *ci_role(struct ci_hdrc *ci)

diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c
index 111b0e0..2bcbc02 100644 (file)
--- a/drivers/usb/chipidea/host.c
+++ b/drivers/usb/chipidea/host.c
@@ -199,6 +199,73 @@ static void host_stop(struct ci_hdrc *ci)
        ci->otg.host = NULL;
 }
 
+static void ci_hdrc_host_save_for_power_lost(struct ci_hdrc *ci)
+{
+       struct ehci_hcd *ehci;
+
+       if (!ci->hcd)
+               return;
+
+       ehci = hcd_to_ehci(ci->hcd);
+       /* save EHCI registers */
+       ci->pm_usbmode = ehci_readl(ehci, &ehci->regs->usbmode);
+       ci->pm_command = ehci_readl(ehci, &ehci->regs->command);
+       ci->pm_command &= ~CMD_RUN;
+       ci->pm_status  = ehci_readl(ehci, &ehci->regs->status);
+       ci->pm_intr_enable  = ehci_readl(ehci, &ehci->regs->intr_enable);
+       ci->pm_frame_index  = ehci_readl(ehci, &ehci->regs->frame_index);
+       ci->pm_segment  = ehci_readl(ehci, &ehci->regs->segment);
+       ci->pm_frame_list  = ehci_readl(ehci, &ehci->regs->frame_list);
+       ci->pm_async_next  = ehci_readl(ehci, &ehci->regs->async_next);
+       ci->pm_configured_flag  =
+                       ehci_readl(ehci, &ehci->regs->configured_flag);
+       ci->pm_portsc = ehci_readl(ehci, &ehci->regs->port_status[0]);
+}
+
+static void ci_hdrc_host_restore_from_power_lost(struct ci_hdrc *ci)
+{
+       struct ehci_hcd *ehci;
+       unsigned long   flags;
+       u32 tmp;
+
+       if (!ci->hcd)
+               return;
+
+       hw_controller_reset(ci);
+
+       ehci = hcd_to_ehci(ci->hcd);
+       spin_lock_irqsave(&ehci->lock, flags);
+       /* Restore EHCI registers */
+       ehci_writel(ehci, ci->pm_usbmode, &ehci->regs->usbmode);
+       ehci_writel(ehci, ci->pm_portsc, &ehci->regs->port_status[0]);
+       ehci_writel(ehci, ci->pm_command, &ehci->regs->command);
+       ehci_writel(ehci, ci->pm_intr_enable, &ehci->regs->intr_enable);
+       ehci_writel(ehci, ci->pm_frame_index, &ehci->regs->frame_index);
+       ehci_writel(ehci, ci->pm_segment, &ehci->regs->segment);
+       ehci_writel(ehci, ci->pm_frame_list, &ehci->regs->frame_list);
+       ehci_writel(ehci, ci->pm_async_next, &ehci->regs->async_next);
+       ehci_writel(ehci, ci->pm_configured_flag,
+                                       &ehci->regs->configured_flag);
+       /* Restore the PHY's connect notifier setting */
+       if (ci->pm_portsc & PORTSC_HSP)
+               usb_phy_notify_connect(ci->usb_phy, USB_SPEED_HIGH);
+
+       tmp = ehci_readl(ehci, &ehci->regs->command);
+       tmp |= CMD_RUN;
+       ehci_writel(ehci, tmp, &ehci->regs->command);
+       spin_unlock_irqrestore(&ehci->lock, flags);
+}
+
+static void ci_hdrc_host_suspend(struct ci_hdrc *ci)
+{
+       ci_hdrc_host_save_for_power_lost(ci);
+}
+
+static void ci_hdrc_host_resume(struct ci_hdrc *ci, bool power_lost)
+{
+       if (power_lost)
+               ci_hdrc_host_restore_from_power_lost(ci);
+}
 
 void ci_hdrc_host_destroy(struct ci_hdrc *ci)
 {
@@ -261,6 +328,8 @@ int ci_hdrc_host_init(struct ci_hdrc *ci)
        rdrv->start     = host_start;
        rdrv->stop      = host_stop;
        rdrv->irq       = host_irq;
+       rdrv->suspend   = ci_hdrc_host_suspend;
+       rdrv->resume    = ci_hdrc_host_resume;
        rdrv->name      = "host";
        ci->roles[CI_ROLE_HOST] = rdrv;