usb: dwc3: ensure consistent types for dwc3_flush_cache

The dwc3_flush_cache() call was declared and used inconsistently:
 * The declaration assumed 'int' for addresses (a potential issue
   when running in a LP64 memory model).
 * The invocation cast the address to 'long'.

This change ensures that both the declaration and usage of this
function consistently uses 'uintptr_t' for correct behaviour even
when the allocated buffers (to be flushed) reside outside of the
lower 32bits of memory.
Signed-off-by: NPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>

drivers/usb/dwc3/ep0.c

@@ -81,8 +81,8 @@ static int dwc3_ep0_start_trans(struct dwc3 *dwc, u8 epnum, dma_addr_t buf_dma,
 		trb->ctrl |= (DWC3_TRB_CTRL_IOC
 				| DWC3_TRB_CTRL_LST);
 
-	dwc3_flush_cache((long)buf_dma, len);
-	dwc3_flush_cache((long)trb, sizeof(*trb));
+	dwc3_flush_cache((uintptr_t)buf_dma, len);
+	dwc3_flush_cache((uintptr_t)trb, sizeof(*trb));
 
 	if (chain)
 		return 0;
@@ -790,7 +790,7 @@ static void dwc3_ep0_complete_data(struct dwc3 *dwc,
 	if (!r)
 		return;
 
-	dwc3_flush_cache((long)trb, sizeof(*trb));
+	dwc3_flush_cache((uintptr_t)trb, sizeof(*trb));
 
 	status = DWC3_TRB_SIZE_TRBSTS(trb->size);
 	if (status == DWC3_TRBSTS_SETUP_PENDING) {
@@ -821,7 +821,7 @@ static void dwc3_ep0_complete_data(struct dwc3 *dwc,
 			ur->actual += transferred;
 
 			trb++;
-			dwc3_flush_cache((long)trb, sizeof(*trb));
+			dwc3_flush_cache((uintptr_t)trb, sizeof(*trb));
 			length = trb->size & DWC3_TRB_SIZE_MASK;
 
 			ep0->free_slot = 0;
@@ -831,7 +831,7 @@ static void dwc3_ep0_complete_data(struct dwc3 *dwc,
 					maxp);
 		transferred = min_t(u32, ur->length - transferred,
 				    transfer_size - length);
-		dwc3_flush_cache((long)dwc->ep0_bounce, DWC3_EP0_BOUNCE_SIZE);
+		dwc3_flush_cache((uintptr_t)dwc->ep0_bounce, DWC3_EP0_BOUNCE_SIZE);
 		memcpy(buf, dwc->ep0_bounce, transferred);
 	} else {
 		transferred = ur->length - length;

drivers/usb/dwc3/gadget.c

@@ -244,7 +244,7 @@ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
 
 	list_del(&req->list);
 	req->trb = NULL;
-	dwc3_flush_cache((long)req->request.dma, req->request.length);
+	dwc3_flush_cache((uintptr_t)req->request.dma, req->request.length);
 
 	if (req->request.status == -EINPROGRESS)
 		req->request.status = status;
@@ -771,8 +771,8 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
 
 	trb->ctrl |= DWC3_TRB_CTRL_HWO;
 
-	dwc3_flush_cache((long)dma, length);
-	dwc3_flush_cache((long)trb, sizeof(*trb));
+	dwc3_flush_cache((uintptr_t)dma, length);
+	dwc3_flush_cache((uintptr_t)trb, sizeof(*trb));
 }
 
 /*
@@ -1769,7 +1769,7 @@ static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep,
 	slot %= DWC3_TRB_NUM;
 	trb = &dep->trb_pool[slot];
 
-	dwc3_flush_cache((long)trb, sizeof(*trb));
+	dwc3_flush_cache((uintptr_t)trb, sizeof(*trb));
 	__dwc3_cleanup_done_trbs(dwc, dep, req, trb, event, status);
 	dwc3_gadget_giveback(dep, req, status);
 
@@ -2670,7 +2670,7 @@ void dwc3_gadget_uboot_handle_interrupt(struct dwc3 *dwc)
 
 		for (i = 0; i < dwc->num_event_buffers; i++) {
 			evt = dwc->ev_buffs[i];
-			dwc3_flush_cache((long)evt->buf, evt->length);
+			dwc3_flush_cache((uintptr_t)evt->buf, evt->length);
 		}
 
 		dwc3_thread_interrupt(0, dwc);

drivers/usb/dwc3/io.h

@@ -48,7 +48,7 @@ static inline void dwc3_writel(void __iomem *base, u32 offset, u32 value)
 	writel(value, base + offs);
 }
 
-static inline void dwc3_flush_cache(int addr, int length)
+static inline void dwc3_flush_cache(uintptr_t addr, int length)
 {
 	flush_dcache_range(addr, addr + ROUND(length, CACHELINE_SIZE));
 }