1 files changed, 34 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index c7d4b5a06bdb..fb7054ccf4fc 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -120,6 +120,16 @@ struct ehci_hcd {			/* one per controller */
         unsigned                has_fsl_port_bug:1; /* FreeScale */
         unsigned                big_endian_mmio:1;
         unsigned                big_endian_desc:1;
+        unsigned                has_amcc_usb23:1;
+
+        /* required for usb32 quirk */
+        #define OHCI_CTRL_HCFS          (3 << 6)
+        #define OHCI_USB_OPER           (2 << 6)
+        #define OHCI_USB_SUSPEND        (3 << 6)
+
+        #define OHCI_HCCTRL_OFFSET      0x4
+        #define OHCI_HCCTRL_LEN         0x4
+        __hc32                  *ohci_hcctrl_reg;
 
         u8                      sbrn;           /* packed release number */
 
@@ -636,6 +646,30 @@ static inline void ehci_writel(const struct ehci_hcd *ehci,
 #endif
 }
 
+/*
+ * On certain ppc-44x SoC there is a HW issue, that could only worked around with
+ * explicit suspend/operate of OHCI. This function hereby makes sense only on that arch.
+ * Other common bits are dependant on has_amcc_usb23 quirk flag.
+ */
+#ifdef CONFIG_44x
+static inline void set_ohci_hcfs(struct ehci_hcd *ehci, int operational)
+{
+        u32 hc_control;
+
+        hc_control = (readl_be(ehci->ohci_hcctrl_reg) & ~OHCI_CTRL_HCFS);
+        if (operational)
+                hc_control |= OHCI_USB_OPER;
+        else
+                hc_control |= OHCI_USB_SUSPEND;
+
+        writel_be(hc_control, ehci->ohci_hcctrl_reg);
+        (void) readl_be(ehci->ohci_hcctrl_reg);
+}
+#else
+static inline void set_ohci_hcfs(struct ehci_hcd *ehci, int operational)
+{ }
+#endif
+
 /*-------------------------------------------------------------------------*/
 
 /*