diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 89908e8..10f11cd 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -31,7 +31,7 @@
  * @param len	the length of the cache line to be flushed
  * @return none
  */
-void xhci_flush_cache(uint32_t addr, u32 len)
+void xhci_flush_cache(uintptr_t addr, u32 len)
 {
 	BUG_ON((void *)addr == NULL || len == 0);
 
@@ -46,7 +46,7 @@
  * @param len	the length of the cache line to be invalidated
  * @return none
  */
-void xhci_inval_cache(uint32_t addr, u32 len)
+void xhci_inval_cache(uintptr_t addr, u32 len)
 {
 	BUG_ON((void *)addr == NULL || len == 0);
 
@@ -175,7 +175,7 @@
 	BUG_ON(!ptr);
 	memset(ptr, '\0', size);
 
-	xhci_flush_cache((uint32_t)ptr, size);
+	xhci_flush_cache((uintptr_t)ptr, size);
 
 	return ptr;
 }
@@ -400,8 +400,8 @@
 	/* Point to output device context in dcbaa. */
 	ctrl->dcbaa->dev_context_ptrs[slot_id] = byte_64;
 
-	xhci_flush_cache((uint32_t)&ctrl->dcbaa->dev_context_ptrs[slot_id],
-							sizeof(__le64));
+	xhci_flush_cache((uintptr_t)&ctrl->dcbaa->dev_context_ptrs[slot_id],
+			 sizeof(__le64));
 	return 0;
 }
 
@@ -478,8 +478,8 @@
 		entry->rsvd = 0;
 		seg = seg->next;
 	}
-	xhci_flush_cache((uint32_t)ctrl->erst.entries,
-			ERST_NUM_SEGS * sizeof(struct xhci_erst_entry));
+	xhci_flush_cache((uintptr_t)ctrl->erst.entries,
+			 ERST_NUM_SEGS * sizeof(struct xhci_erst_entry));
 
 	deq = (unsigned long)ctrl->event_ring->dequeue;
 
@@ -496,7 +496,7 @@
 	/* this is the event ring segment table pointer */
 	val_64 = xhci_readq(&ctrl->ir_set->erst_base);
 	val_64 &= ERST_PTR_MASK;
-	val_64 |= ((u32)(ctrl->erst.entries) & ~ERST_PTR_MASK);
+	val_64 |= ((uintptr_t)(ctrl->erst.entries) & ~ERST_PTR_MASK);
 
 	xhci_writeq(&ctrl->ir_set->erst_base, val_64);
 
@@ -715,6 +715,6 @@
 
 	/* Steps 7 and 8 were done in xhci_alloc_virt_device() */
 
-	xhci_flush_cache((uint32_t)ep0_ctx, sizeof(struct xhci_ep_ctx));
-	xhci_flush_cache((uint32_t)slot_ctx, sizeof(struct xhci_slot_ctx));
+	xhci_flush_cache((uintptr_t)ep0_ctx, sizeof(struct xhci_ep_ctx));
+	xhci_flush_cache((uintptr_t)slot_ctx, sizeof(struct xhci_slot_ctx));
 }
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index b5aade9..f3759d4 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -122,8 +122,8 @@
 			next->link.control |= cpu_to_le32(chain);
 
 			next->link.control ^= cpu_to_le32(TRB_CYCLE);
-			xhci_flush_cache((uint32_t)next,
-						sizeof(union xhci_trb));
+			xhci_flush_cache((uintptr_t)next,
+					 sizeof(union xhci_trb));
 		}
 		/* Toggle the cycle bit after the last ring segment. */
 		if (last_trb_on_last_seg(ctrl, ring,
@@ -191,7 +191,7 @@
 	for (i = 0; i < 4; i++)
 		trb->field[i] = cpu_to_le32(trb_fields[i]);
 
-	xhci_flush_cache((uint32_t)trb, sizeof(struct xhci_generic_trb));
+	xhci_flush_cache((uintptr_t)trb, sizeof(struct xhci_generic_trb));
 
 	inc_enq(ctrl, ring, more_trbs_coming);
 
@@ -244,7 +244,7 @@
 
 		next->link.control ^= cpu_to_le32(TRB_CYCLE);
 
-		xhci_flush_cache((uint32_t)next, sizeof(union xhci_trb));
+		xhci_flush_cache((uintptr_t)next, sizeof(union xhci_trb));
 
 		/* Toggle the cycle bit after the last ring segment. */
 		if (last_trb_on_last_seg(ctrl, ep_ring,
@@ -364,7 +364,7 @@
 	else
 		start_trb->field[3] &= cpu_to_le32(~TRB_CYCLE);
 
-	xhci_flush_cache((uint32_t)start_trb, sizeof(struct xhci_generic_trb));
+	xhci_flush_cache((uintptr_t)start_trb, sizeof(struct xhci_generic_trb));
 
 	/* Ringing EP doorbell here */
 	xhci_writel(&ctrl->dba->doorbell[udev->slot_id],
@@ -403,8 +403,8 @@
 {
 	union xhci_trb *event;
 
-	xhci_inval_cache((uint32_t)ctrl->event_ring->dequeue,
-					sizeof(union xhci_trb));
+	xhci_inval_cache((uintptr_t)ctrl->event_ring->dequeue,
+			 sizeof(union xhci_trb));
 
 	event = ctrl->event_ring->dequeue;
 
@@ -576,8 +576,8 @@
 	ep_index = usb_pipe_ep_index(pipe);
 	virt_dev = ctrl->devs[slot_id];
 
-	xhci_inval_cache((uint32_t)virt_dev->out_ctx->bytes,
-					virt_dev->out_ctx->size);
+	xhci_inval_cache((uintptr_t)virt_dev->out_ctx->bytes,
+			 virt_dev->out_ctx->size);
 
 	ep_ctx = xhci_get_ep_ctx(ctrl, virt_dev->out_ctx, ep_index);
 
@@ -644,7 +644,7 @@
 	first_trb = true;
 
 	/* flush the buffer before use */
-	xhci_flush_cache((uint32_t)buffer, length);
+	xhci_flush_cache((uintptr_t)buffer, length);
 
 	/* Queue the first TRB, even if it's zero-length */
 	do {
@@ -722,7 +722,7 @@
 
 	record_transfer_result(udev, event, length);
 	xhci_acknowledge_event(ctrl);
-	xhci_inval_cache((uint32_t)buffer, length);
+	xhci_inval_cache((uintptr_t)buffer, length);
 
 	return (udev->status != USB_ST_NOT_PROC) ? 0 : -1;
 }
@@ -776,8 +776,8 @@
 			return ret;
 	}
 
-	xhci_inval_cache((uint32_t)virt_dev->out_ctx->bytes,
-				virt_dev->out_ctx->size);
+	xhci_inval_cache((uintptr_t)virt_dev->out_ctx->bytes,
+			 virt_dev->out_ctx->size);
 
 	struct xhci_ep_ctx *ep_ctx = NULL;
 	ep_ctx = xhci_get_ep_ctx(ctrl, virt_dev->out_ctx, ep_index);
@@ -874,7 +874,7 @@
 		trb_fields[2] = length_field;
 		trb_fields[3] = field | ep_ring->cycle_state;
 
-		xhci_flush_cache((uint32_t)buffer, length);
+		xhci_flush_cache((uintptr_t)buffer, length);
 		queue_trb(ctrl, ep_ring, true, trb_fields);
 	}
 
@@ -915,7 +915,7 @@
 
 	/* Invalidate buffer to make it available to usb-core */
 	if (length > 0)
-		xhci_inval_cache((uint32_t)buffer, length);
+		xhci_inval_cache((uintptr_t)buffer, length);
 
 	if (GET_COMP_CODE(le32_to_cpu(event->trans_event.transfer_len))
 			== COMP_SHORT_TX) {
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 87f2972..f8b5ce4 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -256,7 +256,7 @@
 	virt_dev = ctrl->devs[udev->slot_id];
 	in_ctx = virt_dev->in_ctx;
 
-	xhci_flush_cache((uint32_t)in_ctx->bytes, in_ctx->size);
+	xhci_flush_cache((uintptr_t)in_ctx->bytes, in_ctx->size);
 	xhci_queue_command(ctrl, in_ctx->bytes, udev->slot_id, 0,
 			   ctx_change ? TRB_EVAL_CONTEXT : TRB_CONFIG_EP);
 	event = xhci_wait_for_event(ctrl, TRB_COMPLETION);
@@ -325,7 +325,7 @@
 			max_ep_flag = ep_flag;
 	}
 
-	xhci_inval_cache((uint32_t)out_ctx->bytes, out_ctx->size);
+	xhci_inval_cache((uintptr_t)out_ctx->bytes, out_ctx->size);
 
 	/* slot context */
 	xhci_slot_copy(ctrl, in_ctx, out_ctx);
@@ -442,8 +442,8 @@
 		 */
 		return ret;
 
-	xhci_inval_cache((uint32_t)virt_dev->out_ctx->bytes,
-				virt_dev->out_ctx->size);
+	xhci_inval_cache((uintptr_t)virt_dev->out_ctx->bytes,
+			 virt_dev->out_ctx->size);
 	slot_ctx = xhci_get_slot_ctx(ctrl, virt_dev->out_ctx);
 
 	debug("xHC internal address is: %d\n",
@@ -525,7 +525,7 @@
 	ifdesc = &udev->config.if_desc[0];
 
 	out_ctx = ctrl->devs[slot_id]->out_ctx;
-	xhci_inval_cache((uint32_t)out_ctx->bytes, out_ctx->size);
+	xhci_inval_cache((uintptr_t)out_ctx->bytes, out_ctx->size);
 
 	ep_ctx = xhci_get_ep_ctx(ctrl, out_ctx, ep_index);
 	hw_max_packet_size = MAX_PACKET_DECODED(le32_to_cpu(ep_ctx->ep_info2));
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 6685ed2..0951e87 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -17,6 +17,7 @@
 #ifndef HOST_XHCI_H_
 #define HOST_XHCI_H_
 
+#include <asm/types.h>
 #include <asm/cache.h>
 #include <asm/io.h>
 #include <linux/list.h>
@@ -1108,20 +1109,28 @@
  */
 static inline u64 xhci_readq(__le64 volatile *regs)
 {
+#if BITS_PER_LONG == 64
+	return readq(regs);
+#else
 	__u32 *ptr = (__u32 *)regs;
 	u64 val_lo = readl(ptr);
 	u64 val_hi = readl(ptr + 1);
 	return val_lo + (val_hi << 32);
+#endif
 }
 
 static inline void xhci_writeq(__le64 volatile *regs, const u64 val)
 {
+#if BITS_PER_LONG == 64
+	writeq(val, regs);
+#else
 	__u32 *ptr = (__u32 *)regs;
 	u32 val_lo = lower_32_bits(val);
 	/* FIXME */
 	u32 val_hi = upper_32_bits(val);
 	writel(val_lo, ptr);
 	writel(val_hi, ptr + 1);
+#endif
 }
 
 int xhci_hcd_init(int index, struct xhci_hccr **ret_hccr,
@@ -1242,8 +1251,8 @@
 int xhci_ctrl_tx(struct usb_device *udev, unsigned long pipe,
 		 struct devrequest *req, int length, void *buffer);
 int xhci_check_maxpacket(struct usb_device *udev);
-void xhci_flush_cache(uint32_t addr, u32 type_len);
-void xhci_inval_cache(uint32_t addr, u32 type_len);
+void xhci_flush_cache(uintptr_t addr, u32 type_len);
+void xhci_inval_cache(uintptr_t addr, u32 type_len);
 void xhci_cleanup(struct xhci_ctrl *ctrl);
 struct xhci_ring *xhci_ring_alloc(unsigned int num_segs, bool link_trbs);
 int xhci_alloc_virt_device(struct usb_device *udev);