usb: dwc2: replace ioread32/iowrite32_rep with dwc2_readl/writel_rep

dwc2_readl_rep/dwc2_writel_rep functions using readl/writel in a
loop.
Signed-off-by: Gevorg Sahakyan <sahakyan@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/dwc2/core.h

@@ -1161,60 +1161,45 @@ struct dwc2_hsotg {
 #endif /* CONFIG_USB_DWC2_PERIPHERAL || CONFIG_USB_DWC2_DUAL_ROLE */
 };
 
-#ifdef CONFIG_MIPS
-/*
- * There are some MIPS machines that can run in either big-endian
- * or little-endian mode and that use the dwc2 register without
- * a byteswap in both ways.
- * Unlike other architectures, MIPS apparently does not require a
- * barrier before the __raw_writel() to synchronize with DMA but does
- * require the barrier after the __raw_writel() to serialize a set of
- * writes. This set of operations was added specifically for MIPS and
- * should only be used there.
- */
+/* Normal architectures just use readl/write */
 static inline u32 dwc2_readl(struct dwc2_hsotg *hsotg, u32 offset)
 {
-	u32 value = __raw_readl(hsotg->regs + offset);
-
-	/* In order to preserve endianness __raw_* operation is used. Therefore
-	 * a barrier is needed to ensure IO access is not re-ordered across
-	 * reads or writes
-	 */
-	mb();
-	return value;
+	return readl(hsotg->regs + offset);
 }
 
 static inline void dwc2_writel(struct dwc2_hsotg *hsotg, u32 value, u32 offset)
 {
-	__raw_writel(value, hsotg->regs + offset);
+	writel(value, hsotg->regs + offset);
 
-	/*
-	 * In order to preserve endianness __raw_* operation is used. Therefore
-	 * a barrier is needed to ensure IO access is not re-ordered across
-	 * reads or writes
-	 */
-	mb();
 #ifdef DWC2_LOG_WRITES
-	pr_info("INFO:: wrote %08x to %p\n", value, hsotg->regs + offset);
+	pr_info("info:: wrote %08x to %p\n", value, hsotg->regs + offset);
 #endif
 }
-#else
 
-/* Normal architectures just use readl/write */
-static inline u32 dwc2_readl(struct dwc2_hsotg *hsotg, u32 offset)
+static inline void dwc2_readl_rep(struct dwc2_hsotg *hsotg, u32 offset,
+				  void *buffer, unsigned int count)
 {
-	return readl(hsotg->regs + offset);
+	if (count) {
+		u32 *buf = buffer;
+
+		do {
+			u32 x = dwc2_readl(hsotg, offset);
+			*buf++ = x;
+		} while (--count);
+	}
 }
 
-static inline void dwc2_writel(struct dwc2_hsotg *hsotg, u32 value, u32 offset)
+static inline void dwc2_writel_rep(struct dwc2_hsotg *hsotg, u32 offset,
+				   const void *buffer, unsigned int count)
 {
-	writel(value, hsotg->regs + offset);
+	if (count) {
+		const u32 *buf = buffer;
 
-#ifdef DWC2_LOG_WRITES
-	pr_info("info:: wrote %08x to %p\n", value, hsotg->regs + offset);
-#endif
+		do {
+			dwc2_writel(hsotg, *buf++, offset);
+		} while (--count);
+	}
 }
-#endif
 
 /* Reasons for halting a host channel */
 enum dwc2_halt_status {

drivers/usb/dwc2/gadget.c

@@ -599,7 +599,7 @@ static int dwc2_hsotg_write_fifo(struct dwc2_hsotg *hsotg,
 	to_write = DIV_ROUND_UP(to_write, 4);
 	data = hs_req->req.buf + buf_pos;
 
-	iowrite32_rep(hsotg->regs + EPFIFO(hs_ep->index), data, to_write);
+	dwc2_writel_rep(hsotg, EPFIFO(hs_ep->index), data, to_write);
 
 	return (to_write >= can_write) ? -ENOSPC : 0;
 }
@@ -2169,7 +2169,7 @@ static void dwc2_hsotg_rx_data(struct dwc2_hsotg *hsotg, int ep_idx, int size)
 	 * note, we might over-write the buffer end by 3 bytes depending on
 	 * alignment of the data.
 	 */
-	ioread32_rep(hsotg->regs + EPFIFO(ep_idx),
+	dwc2_readl_rep(hsotg, EPFIFO(ep_idx),
 		       hs_req->req.buf + read_ptr, to_read);
 }