692 lines
16 KiB
C
692 lines
16 KiB
C
/* stellarisUartDrv.c - Stellaris UART driver */
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#define DT_DRV_COMPAT ti_stellaris_uart
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/*
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* Copyright (c) 2013-2015 Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @brief Driver for Stellaris UART
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*
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* Driver for Stellaris UART found namely on TI LM3S6965 board. It is similar to
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* an 16550 in functionality, but is not register-compatible.
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* It is also register-compatible with the UART found on TI CC2650 SoC,
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* so it can be used for boards using it, like the TI SensorTag.
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*
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* There is only support for poll-mode, so it can only be used with the printk
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* and STDOUT_CONSOLE APIs.
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*/
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#include <zephyr/kernel.h>
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#include <zephyr/arch/cpu.h>
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#include <zephyr/sys/__assert.h>
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#include <soc.h>
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#include <zephyr/init.h>
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#include <zephyr/drivers/uart.h>
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#include <zephyr/linker/sections.h>
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#include <zephyr/irq.h>
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/* definitions */
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/* Stellaris UART module */
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struct _uart {
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uint32_t dr;
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union {
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uint32_t _sr;
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uint32_t _cr;
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} u1;
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uint8_t _res1[0x010];
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uint32_t fr;
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uint8_t _res2[0x04];
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uint32_t ilpr;
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uint32_t ibrd;
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uint32_t fbrd;
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uint32_t lcrh;
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uint32_t ctl;
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uint32_t ifls;
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uint32_t im;
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uint32_t ris;
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uint32_t mis;
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uint32_t icr;
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uint8_t _res3[0xf8c];
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uint32_t peripd_id4;
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uint32_t peripd_id5;
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uint32_t peripd_id6;
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uint32_t peripd_id7;
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uint32_t peripd_id0;
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uint32_t peripd_id1;
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uint32_t peripd_id2;
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uint32_t peripd_id3;
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uint32_t p_cell_id0;
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uint32_t p_cell_id1;
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uint32_t p_cell_id2;
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uint32_t p_cell_id3;
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};
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struct uart_stellaris_config {
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volatile struct _uart *uart;
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uint32_t sys_clk_freq;
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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uart_irq_config_func_t irq_config_func;
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#endif
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};
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/* Device data structure */
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struct uart_stellaris_dev_data_t {
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uint32_t baud_rate; /* Baud rate */
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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uart_irq_callback_user_data_t cb; /**< Callback function pointer */
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void *cb_data; /**< Callback function arg */
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#endif
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};
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/* bits */
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#define UARTFR_BUSY 0x00000008
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#define UARTFR_RXFE 0x00000010
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#define UARTFR_TXFF 0x00000020
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#define UARTFR_RXFF 0x00000040
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#define UARTFR_TXFE 0x00000080
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#define UARTLCRH_FEN 0x00000010
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#define UARTLCRH_WLEN 0x00000060
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#define UARTCTL_UARTEN 0x00000001
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#define UARTCTL_LBE 0x00000800
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#define UARTCTL_TXEN 0x00000100
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#define UARTCTL_RXEN 0x00000200
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#define UARTTIM_RXIM 0x00000010
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#define UARTTIM_TXIM 0x00000020
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#define UARTTIM_RTIM 0x00000040
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#define UARTTIM_FEIM 0x00000080
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#define UARTTIM_PEIM 0x00000100
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#define UARTTIM_BEIM 0x00000200
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#define UARTTIM_OEIM 0x00000400
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#define UARTMIS_RXMIS 0x00000010
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#define UARTMIS_TXMIS 0x00000020
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static const struct uart_driver_api uart_stellaris_driver_api;
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/**
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* @brief Set the baud rate
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*
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* This routine set the given baud rate for the UART.
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*
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* @param dev UART device struct
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* @param baudrate Baud rate
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* @param sys_clk_freq_hz System clock frequency in Hz
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*/
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static void baudrate_set(const struct device *dev,
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uint32_t baudrate, uint32_t sys_clk_freq_hz)
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{
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const struct uart_stellaris_config *config = dev->config;
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uint32_t brdi, brdf, div, rem;
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/* upon reset, the system clock uses the internal OSC @ 12MHz */
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div = (baudrate * 16U);
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rem = sys_clk_freq_hz % div;
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/*
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* floating part of baud rate (LM3S6965 p.433), equivalent to
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* [float part of (SYSCLK / div)] * 64 + 0.5
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*/
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brdf = ((((rem * 64U) << 1) / div) + 1) >> 1;
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/* integer part of baud rate (LM3S6965 p.433) */
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brdi = sys_clk_freq_hz / div;
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/*
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* those registers are 32-bit, but the reserved bits should be
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* preserved
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*/
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config->uart->ibrd = (uint16_t)(brdi & 0xffff); /* 16 bits */
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config->uart->fbrd = (uint8_t)(brdf & 0x3f); /* 6 bits */
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}
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/**
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* @brief Enable the UART
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*
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* This routine enables the given UART.
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*
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* @param dev UART device struct
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*/
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static inline void enable(const struct device *dev)
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{
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const struct uart_stellaris_config *config = dev->config;
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config->uart->ctl |= UARTCTL_UARTEN;
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}
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/**
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* @brief Disable the UART
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*
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* This routine disables the given UART.
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*
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* @param dev UART device struct
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*/
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static inline void disable(const struct device *dev)
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{
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const struct uart_stellaris_config *config = dev->config;
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config->uart->ctl &= ~UARTCTL_UARTEN;
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/* ensure transmissions are complete */
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while (config->uart->fr & UARTFR_BUSY) {
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}
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/* flush the FIFOs by disabling them */
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config->uart->lcrh &= ~UARTLCRH_FEN;
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}
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/*
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* no stick parity
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* 8-bit frame
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* FIFOs disabled
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* one stop bit
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* parity disabled
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* send break off
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*/
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#define LINE_CONTROL_DEFAULTS UARTLCRH_WLEN
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/**
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* @brief Set the default UART line controls
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*
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* This routine sets the given UART's line controls to their default settings.
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*
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* @param dev UART device struct
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*/
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static inline void line_control_defaults_set(const struct device *dev)
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{
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const struct uart_stellaris_config *config = dev->config;
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config->uart->lcrh = LINE_CONTROL_DEFAULTS;
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}
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/**
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* @brief Initialize UART channel
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*
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* This routine is called to reset the chip in a quiescent state.
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* It is assumed that this function is called only once per UART.
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*
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* @param dev UART device struct
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*
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* @return 0
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*/
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static int uart_stellaris_init(const struct device *dev)
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{
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struct uart_stellaris_dev_data_t *data = dev->data;
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const struct uart_stellaris_config *config = dev->config;
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disable(dev);
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baudrate_set(dev, data->baud_rate,
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config->sys_clk_freq);
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line_control_defaults_set(dev);
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enable(dev);
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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config->irq_config_func(dev);
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#endif
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return 0;
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}
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/**
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* @brief Get the UART transmit ready status
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*
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* This routine returns the given UART's transmit ready status.
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*
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* @param dev UART device struct
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*
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* @return 0 if ready to transmit, 1 otherwise
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*/
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static int poll_tx_ready(const struct device *dev)
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{
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const struct uart_stellaris_config *config = dev->config;
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return (config->uart->fr & UARTFR_TXFE);
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}
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/**
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* @brief Poll the device for input.
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*
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* @param dev UART device struct
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* @param c Pointer to character
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*
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* @return 0 if a character arrived, -1 if the input buffer if empty.
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*/
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static int uart_stellaris_poll_in(const struct device *dev, unsigned char *c)
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{
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const struct uart_stellaris_config *config = dev->config;
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if (config->uart->fr & UARTFR_RXFE) {
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return (-1);
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}
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/* got a character */
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*c = (unsigned char)config->uart->dr;
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return 0;
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}
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/**
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* @brief Output a character in polled mode.
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*
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* Checks if the transmitter is empty. If empty, a character is written to
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* the data register.
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*
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* @param dev UART device struct
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* @param c Character to send
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*/
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static void uart_stellaris_poll_out(const struct device *dev,
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unsigned char c)
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{
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const struct uart_stellaris_config *config = dev->config;
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while (!poll_tx_ready(dev)) {
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}
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/* send a character */
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config->uart->dr = (uint32_t)c;
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}
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#if CONFIG_UART_INTERRUPT_DRIVEN
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/**
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* @brief Fill FIFO with data
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*
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* @param dev UART device struct
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* @param tx_data Data to transmit
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* @param len Number of bytes to send
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*
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* @return Number of bytes sent
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*/
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static int uart_stellaris_fifo_fill(const struct device *dev,
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const uint8_t *tx_data,
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int len)
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{
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const struct uart_stellaris_config *config = dev->config;
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uint8_t num_tx = 0U;
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while ((len - num_tx > 0) && ((config->uart->fr & UARTFR_TXFF) == 0U)) {
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config->uart->dr = (uint32_t)tx_data[num_tx++];
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}
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return (int)num_tx;
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}
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/**
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* @brief Read data from FIFO
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*
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* @param dev UART device struct
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* @param rx_data Pointer to data container
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* @param size Container size
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*
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* @return Number of bytes read
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*/
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static int uart_stellaris_fifo_read(const struct device *dev,
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uint8_t *rx_data,
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const int size)
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{
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const struct uart_stellaris_config *config = dev->config;
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uint8_t num_rx = 0U;
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while ((size - num_rx > 0) && ((config->uart->fr & UARTFR_RXFE) == 0U)) {
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rx_data[num_rx++] = (uint8_t)config->uart->dr;
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}
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return num_rx;
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}
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/**
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* @brief Enable TX interrupt
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*
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* @param dev UART device struct
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*/
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static void uart_stellaris_irq_tx_enable(const struct device *dev)
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{
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static uint8_t first_time =
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1U; /* used to allow the first transmission */
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uint32_t saved_ctl; /* saved UARTCTL (control) register */
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uint32_t saved_ibrd; /* saved UARTIBRD (integer baud rate) register */
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uint32_t saved_fbrd; /* saved UARTFBRD (fractional baud rate) register
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*/
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const struct uart_stellaris_config *config = dev->config;
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if (first_time) {
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/*
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* The Tx interrupt will not be set when transmission is first
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* enabled.
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* A character has to be transmitted before Tx interrupts will
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* work,
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* so send one via loopback mode.
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*/
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first_time = 0U;
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/* save current control and baud rate settings */
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saved_ctl = config->uart->ctl;
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saved_ibrd = config->uart->ibrd;
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saved_fbrd = config->uart->fbrd;
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/* send a character with default settings via loopback */
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disable(dev);
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config->uart->fbrd = 0U;
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config->uart->ibrd = 1U;
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config->uart->lcrh = 0U;
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config->uart->ctl = (UARTCTL_UARTEN | UARTCTL_TXEN | UARTCTL_LBE);
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config->uart->dr = 0U;
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while (config->uart->fr & UARTFR_BUSY) {
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}
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/* restore control and baud rate settings */
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disable(dev);
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config->uart->ibrd = saved_ibrd;
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config->uart->fbrd = saved_fbrd;
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line_control_defaults_set(dev);
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config->uart->ctl = saved_ctl;
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}
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config->uart->im |= UARTTIM_TXIM;
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}
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/**
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* @brief Disable TX interrupt in IER
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*
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* @param dev UART device struct
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*/
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static void uart_stellaris_irq_tx_disable(const struct device *dev)
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{
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const struct uart_stellaris_config *config = dev->config;
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config->uart->im &= ~UARTTIM_TXIM;
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}
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/**
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* @brief Check if Tx IRQ has been raised
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*
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* @param dev UART device struct
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*
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* @return 1 if a Tx IRQ is pending, 0 otherwise
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*/
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static int uart_stellaris_irq_tx_ready(const struct device *dev)
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{
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const struct uart_stellaris_config *config = dev->config;
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return ((config->uart->mis & UARTMIS_TXMIS) == UARTMIS_TXMIS);
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}
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/**
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* @brief Enable RX interrupt in IER
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*
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* @param dev UART device struct
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*/
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static void uart_stellaris_irq_rx_enable(const struct device *dev)
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{
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const struct uart_stellaris_config *config = dev->config;
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config->uart->im |= UARTTIM_RXIM;
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}
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/**
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* @brief Disable RX interrupt in IER
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*
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* @param dev UART device struct
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*/
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static void uart_stellaris_irq_rx_disable(const struct device *dev)
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{
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const struct uart_stellaris_config *config = dev->config;
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config->uart->im &= ~UARTTIM_RXIM;
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}
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/**
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* @brief Check if Rx IRQ has been raised
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*
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* @param dev UART device struct
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*
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* @return 1 if an IRQ is ready, 0 otherwise
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*/
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static int uart_stellaris_irq_rx_ready(const struct device *dev)
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{
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const struct uart_stellaris_config *config = dev->config;
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return ((config->uart->mis & UARTMIS_RXMIS) == UARTMIS_RXMIS);
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}
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/**
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* @brief Enable error interrupts
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*
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* @param dev UART device struct
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*/
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static void uart_stellaris_irq_err_enable(const struct device *dev)
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{
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const struct uart_stellaris_config *config = dev->config;
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config->uart->im |= (UARTTIM_RTIM | UARTTIM_FEIM | UARTTIM_PEIM |
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UARTTIM_BEIM | UARTTIM_OEIM);
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}
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/**
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* @brief Disable error interrupts
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*
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* @param dev UART device struct
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*/
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static void uart_stellaris_irq_err_disable(const struct device *dev)
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{
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const struct uart_stellaris_config *config = dev->config;
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config->uart->im &= ~(UARTTIM_RTIM | UARTTIM_FEIM | UARTTIM_PEIM |
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UARTTIM_BEIM | UARTTIM_OEIM);
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}
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/**
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* @brief Check if Tx or Rx IRQ is pending
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*
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* @param dev UART device struct
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*
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* @return 1 if a Tx or Rx IRQ is pending, 0 otherwise
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*/
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static int uart_stellaris_irq_is_pending(const struct device *dev)
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{
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const struct uart_stellaris_config *config = dev->config;
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/* Look only at Tx and Rx data interrupt flags */
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return ((config->uart->mis & (UARTMIS_RXMIS | UARTMIS_TXMIS)) ? 1 : 0);
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}
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/**
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* @brief Update IRQ status
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*
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* @param dev UART device struct
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*
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* @return Always 1
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*/
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static int uart_stellaris_irq_update(const struct device *dev)
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{
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return 1;
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}
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/**
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* @brief Set the callback function pointer for IRQ.
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*
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* @param dev UART device struct
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* @param cb Callback function pointer.
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*/
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static void uart_stellaris_irq_callback_set(const struct device *dev,
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uart_irq_callback_user_data_t cb,
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void *cb_data)
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{
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struct uart_stellaris_dev_data_t * const dev_data = dev->data;
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dev_data->cb = cb;
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dev_data->cb_data = cb_data;
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}
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/**
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* @brief Interrupt service routine.
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*
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* This simply calls the callback function, if one exists.
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*
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* @param arg Argument to ISR.
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*/
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static void uart_stellaris_isr(const struct device *dev)
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{
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struct uart_stellaris_dev_data_t * const dev_data = dev->data;
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if (dev_data->cb) {
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dev_data->cb(dev, dev_data->cb_data);
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}
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}
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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static const struct uart_driver_api uart_stellaris_driver_api = {
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.poll_in = uart_stellaris_poll_in,
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.poll_out = uart_stellaris_poll_out,
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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.fifo_fill = uart_stellaris_fifo_fill,
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.fifo_read = uart_stellaris_fifo_read,
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.irq_tx_enable = uart_stellaris_irq_tx_enable,
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.irq_tx_disable = uart_stellaris_irq_tx_disable,
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.irq_tx_ready = uart_stellaris_irq_tx_ready,
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.irq_rx_enable = uart_stellaris_irq_rx_enable,
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.irq_rx_disable = uart_stellaris_irq_rx_disable,
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.irq_rx_ready = uart_stellaris_irq_rx_ready,
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.irq_err_enable = uart_stellaris_irq_err_enable,
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.irq_err_disable = uart_stellaris_irq_err_disable,
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.irq_is_pending = uart_stellaris_irq_is_pending,
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.irq_update = uart_stellaris_irq_update,
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.irq_callback_set = uart_stellaris_irq_callback_set,
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#endif
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};
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#ifdef CONFIG_UART_STELLARIS_PORT_0
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static void irq_config_func_0(const struct device *port);
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#endif
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static const struct uart_stellaris_config uart_stellaris_dev_cfg_0 = {
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.uart = (volatile struct _uart *)DT_INST_REG_ADDR(0),
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.sys_clk_freq = DT_INST_PROP_BY_PHANDLE(0, clocks, clock_frequency),
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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.irq_config_func = irq_config_func_0,
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#endif
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};
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static struct uart_stellaris_dev_data_t uart_stellaris_dev_data_0 = {
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.baud_rate = DT_INST_PROP(0, current_speed),
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};
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DEVICE_DT_INST_DEFINE(0,
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&uart_stellaris_init,
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NULL,
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&uart_stellaris_dev_data_0, &uart_stellaris_dev_cfg_0,
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PRE_KERNEL_1, CONFIG_SERIAL_INIT_PRIORITY,
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&uart_stellaris_driver_api);
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static void irq_config_func_0(const struct device *dev)
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{
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IRQ_CONNECT(DT_INST_IRQN(0),
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DT_INST_IRQ(0, priority),
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uart_stellaris_isr, DEVICE_DT_INST_GET(0),
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0);
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irq_enable(DT_INST_IRQN(0));
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}
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#endif
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#endif /* CONFIG_UART_STELLARIS_PORT_0 */
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#ifdef CONFIG_UART_STELLARIS_PORT_1
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static void irq_config_func_1(const struct device *port);
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#endif
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static struct uart_stellaris_config uart_stellaris_dev_cfg_1 = {
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.uart = (volatile struct _uart *)DT_INST_REG_ADDR(1),
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.sys_clk_freq = DT_INST_PROP_BY_PHANDLE(1, clocks, clock_frequency),
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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.irq_config_func = irq_config_func_1,
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#endif
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};
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static struct uart_stellaris_dev_data_t uart_stellaris_dev_data_1 = {
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.baud_rate = DT_INST_PROP(1, current_speed),
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};
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DEVICE_DT_INST_DEFINE(1,
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&uart_stellaris_init,
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NULL,
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&uart_stellaris_dev_data_1, &uart_stellaris_dev_cfg_1,
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PRE_KERNEL_1, CONFIG_SERIAL_INIT_PRIORITY,
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&uart_stellaris_driver_api);
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static void irq_config_func_1(const struct device *dev)
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{
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IRQ_CONNECT(DT_INST_IRQN(1),
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DT_INST_IRQ(1, priority),
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uart_stellaris_isr, DEVICE_DT_INST_GET(1),
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0);
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irq_enable(DT_INST_IRQN(1));
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}
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#endif
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#endif /* CONFIG_UART_STELLARIS_PORT_1 */
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#ifdef CONFIG_UART_STELLARIS_PORT_2
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static void irq_config_func_2(const struct device *port);
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#endif
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static const struct uart_stellaris_config uart_stellaris_dev_cfg_2 = {
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.uart = (volatile struct _uart *)DT_INST_REG_ADDR(2),
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.sys_clk_freq = DT_INST_PROP_BY_PHANDLE(2, clocks, clock_frequency),
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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.irq_config_func = irq_config_func_2,
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#endif
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};
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static struct uart_stellaris_dev_data_t uart_stellaris_dev_data_2 = {
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.baud_rate = DT_INST_PROP(2, current_speed),
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};
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DEVICE_DT_INST_DEFINE(2,
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&uart_stellaris_init,
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NULL,
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&uart_stellaris_dev_data_2, &uart_stellaris_dev_cfg_2,
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PRE_KERNEL_1, CONFIG_SERIAL_INIT_PRIORITY,
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&uart_stellaris_driver_api);
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static void irq_config_func_2(const struct device *dev)
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{
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IRQ_CONNECT(DT_INST_IRQN(2),
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DT_INST_IRQ(2, priority),
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uart_stellaris_isr, DEVICE_DT_INST_GET(2),
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0);
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irq_enable(DT_INST_IRQN(2));
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}
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#endif
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#endif /* CONFIG_UART_STELLARIS_PORT_2 */
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