arch/arm/samv7: add support of SocketLIN interface

Signed-off-by: Petro Karashchenko <petro.karashchenko@gmail.com>

arch/arm/src/samv7/Kconfig

@@ -368,6 +368,10 @@ config SAMV7_1WIREDRIVER
 	bool
 	default n
 
+config SAMV7_LIN_SOCKET
+	bool
+	default n
+
 config SAMV7_USART_IS_SPI_MASTER
 	bool
 	default n
@@ -1445,6 +1449,11 @@ config SAMV7_USART0_1WIREDRIVER
 	bool "1-Wire driver"
 	select SAMV7_1WIREDRIVER
 
+config SAMV7_USART0_LIN_SOCKET
+	bool "LIN driver over SocketCAN"
+	select SAMV7_LIN_SOCKET
+	depends on NET_CAN
+
 config SAMV7_USART0_SPI_MASTER
 	bool "USART0 as SPI Master driver"
 	select SAMV7_USART_IS_SPI_MASTER
@@ -1474,6 +1483,17 @@ config SAMV7_USART0_RS485MODE
 		opened for the first time.
 
 endif # SAMV7_USART0_SERIALDRIVER
+
+if SAMV7_USART0_LIN_SOCKET
+
+config SAMV7_USART0_LIN_BAUD
+	int "BAUD rate"
+	default 19200
+	---help---
+		The configured BAUD of the LIN bus.
+
+endif # SAMV7_USART0_LIN_SOCKET
+
 endif # SAMV7_USART0
 
 menuconfig SAMV7_USART1
@@ -1497,6 +1517,11 @@ config SAMV7_USART1_1WIREDRIVER
 	bool "1-Wire driver"
 	select SAMV7_1WIREDRIVER
 
+config SAMV7_USART1_LIN_SOCKET
+	bool "LIN driver over SocketCAN"
+	select SAMV7_LIN_SOCKET
+	depends on NET_CAN
+
 config SAMV7_USART1_SPI_MASTER
 	bool "USART1 as SPI Master driver"
 	select SAMV7_USART_IS_SPI_MASTER
@@ -1526,6 +1551,17 @@ config SAMV7_USART1_RS485MODE
 		opened for the first time.
 
 endif # SAMV7_USART1_SERIALDRIVER
+
+if SAMV7_USART1_LIN_SOCKET
+
+config SAMV7_USART1_LIN_BAUD
+	int "BAUD rate"
+	default 19200
+	---help---
+		The configured BAUD of the LIN bus.
+
+endif # SAMV7_USART1_LIN_SOCKET
+
 endif # SAMV7_USART1
 
 menuconfig SAMV7_USART2
@@ -1549,6 +1585,11 @@ config SAMV7_USART2_1WIREDRIVER
 	bool "1-Wire driver"
 	select SAMV7_1WIREDRIVER
 
+config SAMV7_USART2_LIN_SOCKET
+	bool "LIN driver over SocketCAN"
+	select SAMV7_LIN_SOCKET
+	depends on NET_CAN
+
 config SAMV7_USART2_SPI_MASTER
 	bool "USART2 as SPI Master driver"
 	select SAMV7_USART_IS_SPI_MASTER
@@ -1578,8 +1619,29 @@ config SAMV7_USART2_RS485MODE
 		opened for the first time.
 
 endif # SAMV7_USART2_SERIALDRIVER
+
+if SAMV7_USART2_LIN_SOCKET
+
+config SAMV7_USART2_LIN_BAUD
+	int "BAUD rate"
+	default 19200
+	---help---
+		The configured BAUD of the LIN bus.
+
+endif # SAMV7_USART2_LIN_SOCKET
+
 endif # SAMV7_USART2
 
+if SAMV7_LIN_SOCKET
+config SAMV7_LIN_REGDEBUG
+	bool "Register level debug"
+	default n
+	depends on DEBUG_NET_INFO
+	---help---
+		Output detailed register-level LIN device debug information.
+		Requires also CONFIG_DEBUG_NET_INFO.
+endif # SAMV7_LIN_SOCKET
+
 config SAMV7_WDT
 	bool "Watchdog Timer (WDT)"
 	default n

arch/arm/src/samv7/Make.defs

@@ -64,6 +64,10 @@ ifeq ($(CONFIG_SAMV7_1WIREDRIVER),y)
 CHIP_CSRCS += sam_1wire.c
 endif
 
+ifeq ($(CONFIG_SAMV7_LIN_SOCKET),y)
+CHIP_CSRCS += sam_lin_sock.c
+endif
+
 ifeq ($(CONFIG_SAMV7_USART_IS_SPI_MASTER),y)
 CHIP_CSRCS += sam_serial_spi.c
 endif

arch/arm/src/samv7/hardware/sam_uart.h

@@ -356,6 +356,8 @@
 #define UART_INT_LINCE               (1 << 28) /* Bit 28: LIN Checksum Error Interrupt (USART, LIN mode only) */
 #define UART_INT_LBLOVFE             (1 << 28) /* Bit 28: LON Backlog Overflow Error Interrupt Enable (USART, LON mode only) */
 #define UART_INT_LINSNRE             (1 << 29) /* Bit 29: LIN Slave Not Responding Error Interrupt (USART, LIN mode only) */
+#define UART_INT_LINSTE              (1 << 30) /* Bit 30: LIN Synch Tolerance Error Interrupt (USART, LIN mode only) */
+#define UART_INT_LINHTE              (1 << 31) /* Bit 31: LIN Header Timeout Error Interrupt (USART, LIN mode only) */
 
 #define UART_INT_ALLINTS             0x3f08e7e7
 

arch/arm/src/samv7/sam_lin.h

@@ -0,0 +1,81 @@
+/****************************************************************************
+ * arch/arm/src/samv7/sam_lin.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_SAMV7_SAM_LIN_H
+#define __ARCH_ARM_SRC_SAMV7_SAM_LIN_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+#ifdef CONFIG_SAMV7_LIN_SOCKET
+
+/****************************************************************************
+ * Name: sam_linsockinitialize
+ *
+ * Description:
+ *   Initialize the selected LIN port as CAN socket interface
+ *
+ * Input Parameters:
+ *   Port number (for hardware that has multiple LIN interfaces)
+ *
+ * Returned Value:
+ *   OK on success; Negated errno on failure.
+ *
+ ****************************************************************************/
+
+int sam_linsockinitialize(int port);
+#endif
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif /* __ARCH_ARM_SRC_SAMV7_SAM_LIN_H */

include/nuttx/can.h

@@ -272,12 +272,12 @@ typedef uint32_t can_err_mask_t;
 
 struct can_frame
 {
-  canid_t can_id;   /* 32 bit CAN_ID + EFF/RTR/ERR flags */
-  uint8_t  can_dlc; /* frame payload length in byte (0 .. CAN_MAX_DLEN) */
-  uint8_t  __pad;   /* padding */
-  uint8_t  __res0;  /* reserved / padding */
-  uint8_t  __res1;  /* reserved / padding */
-  uint8_t  data[CAN_MAX_DLEN];
+  canid_t can_id;  /* 32 bit CAN_ID + EFF/RTR/ERR flags */
+  uint8_t can_dlc; /* frame payload length in byte (0 .. CAN_MAX_DLEN) */
+  uint8_t __pad;   /* padding */
+  uint8_t __res0;  /* reserved / padding */
+  uint8_t __res1;  /* reserved / padding */
+  uint8_t data[CAN_MAX_DLEN];
 };
 
 /* struct canfd_frame - CAN flexible data rate frame structure