[nrf fromtree] drivers: udc_dwc2: Add helpers to check operating mode

Use helper functions to check whether device is operating in Buffer DMA
or Completer mode. This allows compile time optimizations to remove DMA
handling code when DMA is disabled via KConfig symbol UDC_DWC2_DMA.

Signed-off-by: Tomasz Moń <[email protected]>
(cherry picked from commit d4cc8de)
(cherry picked from commit a284c39)

Author: tmon-nordic

drivers/usb/udc/udc_dwc2.c

@@ -203,6 +203,20 @@ static void dwc2_wait_for_bit(const struct device *dev,
 	}
 }
 
+static inline bool dwc2_in_completer_mode(const struct device *dev)
+{
+	struct udc_dwc2_data *const priv = udc_get_private(dev);
+
+	return !IS_ENABLED(CONFIG_UDC_DWC2_DMA) || !priv->bufferdma;
+}
+
+static inline bool dwc2_in_buffer_dma_mode(const struct device *dev)
+{
+	struct udc_dwc2_data *const priv = udc_get_private(dev);
+
+	return IS_ENABLED(CONFIG_UDC_DWC2_DMA) && priv->bufferdma;
+}
+
 /* Get DOEPCTLn or DIEPCTLn register address */
 static mem_addr_t dwc2_get_dxepctl_reg(const struct device *dev, const uint8_t ep)
 {
@@ -422,7 +436,7 @@ static int dwc2_tx_fifo_write(const struct device *dev,
 		len = buf->len;
 	}
 
-	if (!priv->bufferdma) {
+	if (dwc2_in_completer_mode(dev)) {
 		uint32_t spcavail = dwc2_ftx_avail(dev, ep_idx);
 		uint32_t spcperpkt = ROUND_UP(udc_mps_ep_size(cfg), 4);
 		uint32_t max_pkts, max_transfer;
@@ -487,7 +501,7 @@ static int dwc2_tx_fifo_write(const struct device *dev,
 		    usb_dwc2_set_dieptsizn_pktcnt(pktcnt) |
 		    usb_dwc2_set_dieptsizn_xfersize(len), dieptsiz_reg);
 
-	if (priv->bufferdma) {
+	if (dwc2_in_buffer_dma_mode(dev)) {
 		if (!dwc2_dma_buffer_ok_to_use(dev, buf->data, len, cfg->mps)) {
 			/* Cannot continue unless buffer is bounced. Device will
 			 * cease to function. Is fatal error appropriate here?
@@ -530,7 +544,7 @@ static int dwc2_tx_fifo_write(const struct device *dev,
 	/* Clear IN Endpoint NAK Effective interrupt in case it was set */
 	sys_write32(USB_DWC2_DIEPINT_INEPNAKEFF, diepint_reg);
 
-	if (!priv->bufferdma) {
+	if (dwc2_in_completer_mode(dev)) {
 		const uint8_t *src = buf->data;
 
 		while (pktcnt > 0) {
@@ -659,7 +673,7 @@ static void dwc2_prep_rx(const struct device *dev, struct net_buf *buf,
 	priv->rx_siz[ep_idx] = doeptsiz;
 	sys_write32(doeptsiz, doeptsiz_reg);
 
-	if (priv->bufferdma) {
+	if (dwc2_in_buffer_dma_mode(dev)) {
 		void *data = net_buf_tail(buf);
 
 		if (!dwc2_dma_buffer_ok_to_use(dev, data, xfersize, cfg->mps)) {
@@ -1211,7 +1225,7 @@ static int dwc2_set_dedicated_fifo(const struct device *dev,
 	tmp = *diepctl & ~USB_DWC2_DEPCTL_TXFNUM_MASK;
 
 	reqdep = DIV_ROUND_UP(udc_mps_ep_size(cfg), 4U);
-	if (priv->bufferdma) {
+	if (dwc2_in_buffer_dma_mode(dev)) {
 		/* In DMA mode, TxFIFO capable of holding 2 packets is enough */
 		reqdep *= MIN(2, (1 + addnl));
 	} else {
@@ -2292,15 +2306,15 @@ static void dwc2_on_bus_reset(const struct device *dev)
 	}
 
 	doepmsk = USB_DWC2_DOEPINT_SETUP | USB_DWC2_DOEPINT_XFERCOMPL;
-	if (priv->bufferdma) {
+	if (dwc2_in_buffer_dma_mode(dev)) {
 		doepmsk |= USB_DWC2_DOEPINT_STSPHSERCVD;
 	}
 
 	sys_write32(doepmsk, (mem_addr_t)&base->doepmsk);
 	sys_set_bits((mem_addr_t)&base->diepmsk, USB_DWC2_DIEPINT_XFERCOMPL);
 
 	/* Software has to handle RxFLvl interrupt only in Completer mode */
-	if (!priv->bufferdma) {
+	if (dwc2_in_completer_mode(dev)) {
 		sys_set_bits((mem_addr_t)&base->gintmsk,
 			     USB_DWC2_GINTSTS_RXFLVL);
 	}
@@ -2506,7 +2520,7 @@ static inline void dwc2_handle_out_xfercompl(const struct device *dev,
 		}
 
 		if (!valid) {
-			if (!priv->bufferdma) {
+			if (dwc2_in_completer_mode(dev)) {
 				/* RxFlvl added data to net buf, rollback */
 				net_buf_remove_mem(buf, bcnt);
 			}
@@ -2515,7 +2529,7 @@ static inline void dwc2_handle_out_xfercompl(const struct device *dev,
 		}
 	}
 
-	if (priv->bufferdma && bcnt) {
+	if (dwc2_in_buffer_dma_mode(dev) && bcnt) {
 		sys_cache_data_invd_range(net_buf_tail(buf), bcnt);
 		net_buf_add(buf, bcnt);
 	}
@@ -2559,7 +2573,8 @@ static inline void dwc2_handle_oepint(const struct device *dev)
 		/* StupPktRcvd is not enabled for interrupt, but must be checked
 		 * when XferComp hits to determine if SETUP token was received.
 		 */
-		if (priv->bufferdma && (status & USB_DWC2_DOEPINT_XFERCOMPL) &&
+		if (dwc2_in_buffer_dma_mode(dev) &&
+		    (status & USB_DWC2_DOEPINT_XFERCOMPL) &&
 		    (doepint & USB_DWC2_DOEPINT_STUPPKTRCVD)) {
 			uint32_t addr;