Kintis:LPUART add RX DMA

arch/arm/src/kinetis/Kconfig

@@ -1398,6 +1398,62 @@ config KINETIS_SERIAL_RXDMA_BUFFER_SIZE
 
 endmenu # Kinetis UART Configuration
 
+menu "Kinetis LPUART Configuration"
+if KINETIS_SERIALDRIVER || OTHER_SERIALDRIVER
+
+comment "LP Uart Driver Configuration"
+
+config KINETIS_LPUART0_RXDMA
+	bool "LPUART0 Rx DMA"
+	default n
+	depends on KINETIS_LPUART0 && KINETIS_EDMA
+	---help---
+		In high data rate usage, Rx DMA may eliminate Rx overrun errors
+
+config KINETIS_LPUART1_RXDMA
+	bool "LPUART1 Rx DMA"
+	default n
+	depends on KINETIS_LPUART1 && KINETIS_EDMA
+	---help---
+		In high data rate usage, Rx DMA may eliminate Rx overrun errors
+
+config KINETIS_LPUART2_RXDMA
+	bool "LPUART2 Rx DMA"
+	default n
+	depends on KINETIS_LPUART2 && KINETIS_EDMA
+	---help---
+		In high data rate usage, Rx DMA may eliminate Rx overrun errors
+
+config KINETIS_LPUART3_RXDMA
+	bool "LPUART3 Rx DMA"
+	default n
+	depends on KINETIS_LPUART3 && KINETIS_EDMA
+	---help---
+		In high data rate usage, Rx DMA may eliminate Rx overrun errors
+
+config KINETIS_LPUART4_RXDMA
+	bool "LPUART4 Rx DMA"
+	default n
+	depends on KINETIS_LPUART4 && KINETIS_EDMA
+	---help---
+		In high data rate usage, Rx DMA may eliminate Rx overrun errors
+
+config KINETIS_LPUART_RXDMA_BUFFER_SIZE
+	int "Rx DMA buffer size"
+	default 32
+	depends on KINETIS_LPUART0_RXDMA || KINETIS_LPUART1_RXDMA || KINETIS_LPUART2_RXDMA || KINETIS_LPUART3_RXDMA || KINETIS_LPUART4_RXDMA
+	---help---
+		The DMA buffer size when using RX DMA to emulate a FIFO.
+
+		When streaming data, the generic serial layer will be called
+		every time the FIFO receives half this number of bytes.
+
+		Value given here will be rounded up to next multiple of 32 bytes.
+
+endif # KINETIS_SERIALDRIVER || OTHER_SERIALDRIVER
+
+endmenu # Kinetis LPUART Configuration
+
 config KINETIS_MERGE_TTY
 	bool "Kinetis Merge TTY names for LPUARTS"
 	default n

arch/arm/src/kinetis/kinetis_lpuart.h

@@ -0,0 +1,101 @@
+/****************************************************************************
+ * arch/arm/src/kinetis/kinetis_lpuart.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __ARCH_ARM_SRC_KINETIS_KINETIS_LPUART_H
+#define __ARCH_ARM_SRC_KINETIS_KINETIS_LPUART_H
+
+#if defined(HAVE_UART_DEVICE) && defined(USE_SERIALDRIVER)
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Is DMA available on any (enabled) LPUART? */
+
+#undef LPSERIAL_HAVE_DMA
+#if defined(CONFIG_KINETIS_LPUART0_RXDMA) || defined(CONFIG_KINETIS_LPUART1_RXDMA) || \
+    defined(CONFIG_KINETIS_LPUART2_RXDMA) || defined(CONFIG_KINETIS_LPUART3_RXDMA) || \
+    defined(CONFIG_KINETIS_LPUART4_RXDMA)
+#  define LPSERIAL_HAVE_DMA 1
+
+/* Is DMA available on All (enabled) LPUART? */
+
+#define LPSERIAL_HAVE_ALL_DMA 1
+#  if (defined(CONFIG_KINETIS_LPUART0) && !defined(CONFIG_KINETIS_LPUART0_RXDMA)) || \
+      (defined(CONFIG_KINETIS_LPUART1) && !defined(CONFIG_KINETIS_LPUART1_RXDMA)) || \
+      (defined(CONFIG_KINETIS_LPUART2) && !defined(CONFIG_KINETIS_LPUART2_RXDMA)) || \
+      (defined(CONFIG_KINETIS_LPUART3) && !defined(CONFIG_KINETIS_LPUART3_RXDMA)) || \
+      (defined(CONFIG_KINETIS_LPUART4) && !defined(CONFIG_KINETIS_LPUART4_RXDMA))
+#    undef LPSERIAL_HAVE_ALL_DMA
+#  endif
+#endif
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Public Functions Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: kinetis_serial_dma_poll
+ *
+ * Description:
+ *   Must be called periodically if any Kinetis LPUART is configured for DMA.
+ *   The DMA callback is triggered for each fifo size/2 bytes, but this can
+ *   result in some bytes being transferred but not collected if the incoming
+ *   data is not a whole multiple of half the FIFO size.
+ *
+ *   May be safely called from either interrupt or thread context.
+ *
+ ****************************************************************************/
+
+#ifdef LPSERIAL_HAVE_DMA
+void kinetis_lpserial_dma_poll(void);
+#endif
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif /* HAVE_UART_DEVICE && USE_SERIALDRIVER) */
+#endif /* __ARCH_ARM_SRC_KINETIS_KINETIS_UART_H */