platform: drivers: Add Vybrid UART support

Add Vybrid lpuart driver

Signed-off-by: Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>

2 files changed, 309 insertions, 0 deletions

diff --git a/platform/drivers/inc/lpuart_vf6xx.h b/platform/drivers/inc/lpuart_vf6xx.h
new file mode 100644
index 0000000..608d239
--- /dev/null
+++ b/platform/drivers/inc/lpuart_vf6xx.h
@@ -0,0 +1,179 @@
+/*
+ * Copyright (c) 2015, Freescale Semiconductor, Inc.
+ * Copyright (c) 2016, Toradex AG
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * o Redistributions of source code must retain the above copyright notice, this list
+ *   of conditions and the following disclaimer.
+ *
+ * o Redistributions in binary form must reproduce the above copyright notice, this
+ *   list of conditions and the following disclaimer in the documentation and/or
+ *   other materials provided with the distribution.
+ *
+ * o Neither the name of Freescale Semiconductor, Inc. nor the names of its
+ *   contributors may be used to endorse or promote products derived from this
+ *   software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __LPUART_VF6XX_H__
+#define __LPUART_VF6XX_H__
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <assert.h>
+#include "device_imx.h"
+
+/*******************************************************************************
+ * Definitions
+ ******************************************************************************/
+
+/*! @brief UART module initialize structure. */
+typedef struct _uart_init_config
+{
+    uint32_t clockRate;     /*!< Current UART module clock freq. */
+    uint32_t baudRate;      /*!< Desired UART baud rate. */
+    uint32_t wordLength;    /*!< Data bits in one frame. */
+    uint32_t parity;        /*!< Parity error check mode of this module. */
+} uart_init_config_t;
+
+/*!
+ * @brief UART number of data bits in a character.
+ */
+enum _uart_word_length
+{
+    uartWordLength8Bits     = 0x0,
+    uartWordLength9Bits     = UART_UCR1_M,
+};
+
+/*!
+ * @brief UART parity mode.
+ */
+enum _uart_partity_mode
+{
+    uartParityDisable       = 0x0,
+    uartParityEven          = UART_UCR1_PE,
+    uartParityOdd           = UART_UCR1_PE | UART_UCR1_PT
+};
+
+/*******************************************************************************
+ * API
+ ******************************************************************************/
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+/*!
+ * @name UART Initialization and Configuration functions
+ * @{
+ */
+
+/*!
+ * @brief Initialize UART module with given initialize structure.
+ *
+ * @param base UART base pointer.
+ * @param initConfig UART initialize structure(see uart_init_config_t above).
+ */
+void LPUART_Init(UART_Type* base, uart_init_config_t* initConfig);
+
+/*FUNCTION**********************************************************************
+ *
+ * Function Name : LPUART_SetParity
+ * Description   : This function configures uart module parity mode.
+ *
+ *END**************************************************************************/
+static inline void LPUART_SetParity(UART_Type* base, uint32_t parityMode)
+{
+	UART_C1_REG(base) = parityMode;
+}
+
+/*!
+ * @brief This function is used to set the baud rate of UART Module.
+ *
+ * @param base UART base pointer.
+ * @param clockRate UART module clock frequency.
+ * @param baudRate Desired UART module baud rate.
+ */
+void LPUART_SetBaudRate(UART_Type* base, uint32_t clockRate, uint32_t baudRate);
+
+/*!
+ * @brief This function is used to send data.
+ *
+ * @param base UART base pointer.
+ * @param data Data to be set through Uart module.
+ */
+static inline void LPUART_PutChar(UART_Type* base, uint8_t data)
+{
+    UART_D_REG(base) = data;
+}
+
+/*!
+ * @brief This function is used to receive data.
+ *
+ * @param base UART base pointer.
+ * @return The data received from UART module.
+ */
+static inline uint8_t LPUART_GetChar(UART_Type* base)
+{
+    return UART_D_REG(base);
+}
+
+static inline void LPUART_Enable(UART_Type* base)
+{
+	UART_C2_REG(base) |= (UART_UCR2_TE | UART_UCR2_RE);
+}
+
+static inline void LPUART_Disable(UART_Type* base)
+{
+	UART_C2_REG(base) &= ~(UART_UCR2_TE | UART_UCR2_RE);
+}
+
+static inline void LPUART_WaitRecvReady(UART_Type* base)
+{
+	/* Wait until the data is ready to be received. */
+	while ((UART_S1_REG(base) & UART_S1_RDRF) == 0);
+}
+
+static inline uint8_t LPUART_RecvBlocking(UART_Type* base)
+{
+	LPUART_WaitRecvReady(base);
+
+	return LPUART_GetChar(base);
+}
+
+static inline void LPUART_WaitSendReady(UART_Type* base)
+{
+	/* Wait until the data has been transferred into the shift register. */
+	while ((UART_S1_REG(base) & UART_S1_TC) == 0);
+}
+
+static inline void LPUART_SendBlocking(UART_Type* base, uint8_t data)
+{
+	LPUART_WaitSendReady(base);
+	LPUART_PutChar(base, data);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+/*! @}*/
+
+#endif /* __LPUART_VF6XX_H__ */
+/*******************************************************************************
+ * EOF
+ ******************************************************************************/
diff --git a/platform/drivers/src/lpuart_vf6xx.c b/platform/drivers/src/lpuart_vf6xx.c
new file mode 100644
index 0000000..e28d198
--- /dev/null
+++ b/platform/drivers/src/lpuart_vf6xx.c
@@ -0,0 +1,130 @@
+/*
+ * Copyright (c) 2015, Freescale Semiconductor, Inc.
+ * Copyright (c) 2016, Toradex AG
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * o Redistributions of source code must retain the above copyright notice, this list
+ *   of conditions and the following disclaimer.
+ *
+ * o Redistributions in binary form must reproduce the above copyright notice, this
+ *   list of conditions and the following disclaimer in the documentation and/or
+ *   other materials provided with the distribution.
+ *
+ * o Neither the name of Freescale Semiconductor, Inc. nor the names of its
+ *   contributors may be used to endorse or promote products derived from this
+ *   software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <lpuart_vf6xx.h>
+
+/*******************************************************************************
+ * Code
+ ******************************************************************************/
+
+/*******************************************************************************
+ * Initialization and Configuration functions
+ ******************************************************************************/
+/*FUNCTION**********************************************************************
+ *
+ * Function Name : LPUART_Init
+ * Description   : This function initializes the module according to uart
+ *                 initialize structure.
+ *
+ *END**************************************************************************/
+void LPUART_Init(UART_Type* base, uart_init_config_t* initConfig)
+{
+	assert(initConfig);
+
+	LPUART_Disable(base);
+	LPUART_SetParity(base, initConfig->parity);
+	LPUART_SetBaudRate(base, initConfig->clockRate, initConfig->baudRate);
+}
+
+/*FUNCTION**********************************************************************
+ *
+ * Function Name : LPUART_SetBaudRate
+ * Description   : This function configures uart module baud rate.
+ *
+ *END**************************************************************************/
+void LPUART_SetBaudRate(UART_Type* base, uint32_t clockRate, uint32_t baudRate)
+{
+	uint32_t sbr, brfa;
+	uint8_t cr4 = 0, bdh = 0;
+
+	sbr = clockRate / (16 * baudRate);
+	brfa = ((clockRate - (16 * sbr * baudRate)) * 2) / baudRate;
+	bdh &= ~UART_BDH_SBR_MASK;
+	bdh |= (sbr >> 8) & UART_BDH_SBR_MASK;
+	cr4 &= ~UART_C4_BRFA_MASK;
+	brfa &= UART_C4_BRFA_MASK;
+
+	UART_C4_REG(base) = (cr4 | brfa);
+	UART_BDH_REG(base) = bdh;
+	UART_BDL_REG(base) = sbr;
+}
+
+/*******************************************************************************
+ * Hardware Flow control and Modem Signal functions
+ ******************************************************************************/
+/*FUNCTION**********************************************************************
+ *
+ * Function Name : LPUART_SetRtsFlowCtrl
+ * Description   : This function is used to set the enable condition of RTS
+ *                 auto control.
+ *
+ *END**************************************************************************/
+void LPUART_SetRtsFlowCtrl(UART_Type* base, bool enable)
+{
+	if (enable)
+		UART_MODEM_REG(base) &= ~UART_FLOWCONTROL_RTS;
+	else
+		UART_MODEM_REG(base) |= UART_FLOWCONTROL_RTS;
+}
+
+/*FUNCTION**********************************************************************
+ *
+ * Function Name : LPUART_SetCtsFlowCtrl
+ * Description   : This function is used to set the enable condition of CTS
+ *                 auto control.
+ *
+ *END**************************************************************************/
+void LPUART_SetCtsFlowCtrl(UART_Type* base, bool enable)
+{
+	if (enable)
+		UART_MODEM_REG(base) |= UART_FLOWCONTROL_CTS;
+	else
+		UART_MODEM_REG(base) &= ~UART_FLOWCONTROL_CTS;
+}
+
+/*FUNCTION**********************************************************************
+ *
+ * Function Name : LPUART_SetFlowCtrl
+ * Description   : This function is used to set the enable condition of RTS, CTS
+ *                 auto control.
+ *
+ *END**************************************************************************/
+void LPUART_SetFlowCtrl(UART_Type* base, bool enable)
+{
+	if (enable)
+		UART_MODEM_REG(base) |= UART_FLOWCONTROL_MASK;
+	else
+		UART_MODEM_REG(base) &= ~UART_FLOWCONTROL_MASK;
+}
+
+/*******************************************************************************
+ * EOF
+ ******************************************************************************/