408 lines
10 KiB
C
408 lines
10 KiB
C
/*
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* Copyright (c) 2017, NXP
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* Copyright (c) 2020 PHYTEC Messtechnik GmbH
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT nxp_kinetis_uart
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#include <errno.h>
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#include <device.h>
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#include <drivers/uart.h>
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#include <drivers/clock_control.h>
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#include <fsl_uart.h>
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#include <soc.h>
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struct uart_mcux_config {
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UART_Type *base;
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char *clock_name;
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clock_control_subsys_t clock_subsys;
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struct uart_config uart_cfg;
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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void (*irq_config_func)(struct device *dev);
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#endif
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};
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struct uart_mcux_data {
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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uart_irq_callback_user_data_t callback;
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void *cb_data;
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#endif
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};
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static int uart_mcux_configure(struct device *dev,
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const struct uart_config *cfg)
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{
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const struct uart_mcux_config *config = dev->config_info;
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uart_config_t uart_config;
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struct device *clock_dev;
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uint32_t clock_freq;
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status_t retval;
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clock_dev = device_get_binding(config->clock_name);
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if (clock_dev == NULL) {
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return -EINVAL;
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}
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if (clock_control_get_rate(clock_dev, config->clock_subsys,
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&clock_freq)) {
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return -EINVAL;
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}
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UART_GetDefaultConfig(&uart_config);
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uart_config.enableTx = true;
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uart_config.enableRx = true;
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uart_config.baudRate_Bps = cfg->baudrate;
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switch (cfg->stop_bits) {
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case UART_CFG_STOP_BITS_1:
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#if defined(FSL_FEATURE_UART_HAS_STOP_BIT_CONFIG_SUPPORT) && \
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FSL_FEATURE_UART_HAS_STOP_BIT_CONFIG_SUPPORT
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uart_config.stopBitCount = kUART_OneStopBit;
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break;
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case UART_CFG_STOP_BITS_2:
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uart_config.stopBitCount = kUART_TwoStopBit;
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#endif
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break;
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default:
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return -ENOTSUP;
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}
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switch (cfg->flow_ctrl) {
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case UART_CFG_FLOW_CTRL_NONE:
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uart_config.enableRxRTS = false;
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uart_config.enableTxCTS = false;
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break;
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case UART_CFG_FLOW_CTRL_RTS_CTS:
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uart_config.enableRxRTS = true;
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uart_config.enableTxCTS = true;
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break;
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default:
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return -ENOTSUP;
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}
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switch (cfg->parity) {
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case UART_CFG_PARITY_NONE:
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uart_config.parityMode = kUART_ParityDisabled;
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break;
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case UART_CFG_PARITY_EVEN:
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uart_config.parityMode = kUART_ParityEven;
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break;
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case UART_CFG_PARITY_ODD:
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uart_config.parityMode = kUART_ParityOdd;
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break;
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default:
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return -ENOTSUP;
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}
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retval = UART_Init(config->base, &uart_config, clock_freq);
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if (retval != kStatus_Success) {
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return -EINVAL;
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}
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return 0;
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}
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static int uart_mcux_poll_in(struct device *dev, unsigned char *c)
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{
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const struct uart_mcux_config *config = dev->config_info;
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uint32_t flags = UART_GetStatusFlags(config->base);
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int ret = -1;
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if (flags & kUART_RxDataRegFullFlag) {
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*c = UART_ReadByte(config->base);
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ret = 0;
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}
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return ret;
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}
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static void uart_mcux_poll_out(struct device *dev, unsigned char c)
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{
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const struct uart_mcux_config *config = dev->config_info;
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while (!(UART_GetStatusFlags(config->base) & kUART_TxDataRegEmptyFlag)) {
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}
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UART_WriteByte(config->base, c);
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}
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static int uart_mcux_err_check(struct device *dev)
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{
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const struct uart_mcux_config *config = dev->config_info;
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uint32_t flags = UART_GetStatusFlags(config->base);
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int err = 0;
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if (flags & kUART_RxOverrunFlag) {
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err |= UART_ERROR_OVERRUN;
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}
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if (flags & kUART_ParityErrorFlag) {
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err |= UART_ERROR_PARITY;
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}
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if (flags & kUART_FramingErrorFlag) {
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err |= UART_ERROR_FRAMING;
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}
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UART_ClearStatusFlags(config->base, kUART_RxOverrunFlag |
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kUART_ParityErrorFlag |
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kUART_FramingErrorFlag);
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return err;
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}
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static int uart_mcux_fifo_fill(struct device *dev, const uint8_t *tx_data,
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int len)
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{
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const struct uart_mcux_config *config = dev->config_info;
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uint8_t num_tx = 0U;
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while ((len - num_tx > 0) &&
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(UART_GetStatusFlags(config->base) & kUART_TxDataRegEmptyFlag)) {
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UART_WriteByte(config->base, tx_data[num_tx++]);
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}
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return num_tx;
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}
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static int uart_mcux_fifo_read(struct device *dev, uint8_t *rx_data,
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const int len)
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{
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const struct uart_mcux_config *config = dev->config_info;
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uint8_t num_rx = 0U;
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while ((len - num_rx > 0) &&
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(UART_GetStatusFlags(config->base) & kUART_RxDataRegFullFlag)) {
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rx_data[num_rx++] = UART_ReadByte(config->base);
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}
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return num_rx;
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}
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static void uart_mcux_irq_tx_enable(struct device *dev)
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{
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const struct uart_mcux_config *config = dev->config_info;
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uint32_t mask = kUART_TxDataRegEmptyInterruptEnable;
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UART_EnableInterrupts(config->base, mask);
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}
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static void uart_mcux_irq_tx_disable(struct device *dev)
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{
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const struct uart_mcux_config *config = dev->config_info;
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uint32_t mask = kUART_TxDataRegEmptyInterruptEnable;
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UART_DisableInterrupts(config->base, mask);
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}
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static int uart_mcux_irq_tx_complete(struct device *dev)
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{
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const struct uart_mcux_config *config = dev->config_info;
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uint32_t flags = UART_GetStatusFlags(config->base);
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return (flags & kUART_TransmissionCompleteFlag) != 0U;
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}
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static int uart_mcux_irq_tx_ready(struct device *dev)
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{
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const struct uart_mcux_config *config = dev->config_info;
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uint32_t mask = kUART_TxDataRegEmptyInterruptEnable;
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uint32_t flags = UART_GetStatusFlags(config->base);
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return (UART_GetEnabledInterrupts(config->base) & mask)
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&& (flags & kUART_TxDataRegEmptyFlag);
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}
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static void uart_mcux_irq_rx_enable(struct device *dev)
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{
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const struct uart_mcux_config *config = dev->config_info;
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uint32_t mask = kUART_RxDataRegFullInterruptEnable;
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UART_EnableInterrupts(config->base, mask);
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}
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static void uart_mcux_irq_rx_disable(struct device *dev)
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{
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const struct uart_mcux_config *config = dev->config_info;
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uint32_t mask = kUART_RxDataRegFullInterruptEnable;
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UART_DisableInterrupts(config->base, mask);
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}
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static int uart_mcux_irq_rx_full(struct device *dev)
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{
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const struct uart_mcux_config *config = dev->config_info;
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uint32_t flags = UART_GetStatusFlags(config->base);
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return (flags & kUART_RxDataRegFullFlag) != 0U;
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}
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static int uart_mcux_irq_rx_ready(struct device *dev)
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{
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const struct uart_mcux_config *config = dev->config_info;
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uint32_t mask = kUART_RxDataRegFullInterruptEnable;
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return (UART_GetEnabledInterrupts(config->base) & mask)
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&& uart_mcux_irq_rx_full(dev);
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}
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static void uart_mcux_irq_err_enable(struct device *dev)
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{
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const struct uart_mcux_config *config = dev->config_info;
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uint32_t mask = kUART_NoiseErrorInterruptEnable |
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kUART_FramingErrorInterruptEnable |
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kUART_ParityErrorInterruptEnable;
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UART_EnableInterrupts(config->base, mask);
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}
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static void uart_mcux_irq_err_disable(struct device *dev)
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{
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const struct uart_mcux_config *config = dev->config_info;
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uint32_t mask = kUART_NoiseErrorInterruptEnable |
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kUART_FramingErrorInterruptEnable |
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kUART_ParityErrorInterruptEnable;
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UART_DisableInterrupts(config->base, mask);
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}
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static int uart_mcux_irq_is_pending(struct device *dev)
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{
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return uart_mcux_irq_tx_ready(dev) || uart_mcux_irq_rx_ready(dev);
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}
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static int uart_mcux_irq_update(struct device *dev)
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{
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return 1;
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}
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static void uart_mcux_irq_callback_set(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_mcux_data *data = dev->driver_data;
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data->callback = cb;
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data->cb_data = cb_data;
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}
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static void uart_mcux_isr(void *arg)
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{
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struct device *dev = arg;
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struct uart_mcux_data *data = dev->driver_data;
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if (data->callback) {
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data->callback(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 int uart_mcux_init(struct device *dev)
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{
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const struct uart_mcux_config *config = dev->config_info;
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int err;
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err = uart_mcux_configure(dev, &config->uart_cfg);
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if (err != 0) {
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return err;
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}
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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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static const struct uart_driver_api uart_mcux_driver_api = {
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.poll_in = uart_mcux_poll_in,
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.poll_out = uart_mcux_poll_out,
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.err_check = uart_mcux_err_check,
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.configure = uart_mcux_configure,
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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.fifo_fill = uart_mcux_fifo_fill,
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.fifo_read = uart_mcux_fifo_read,
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.irq_tx_enable = uart_mcux_irq_tx_enable,
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.irq_tx_disable = uart_mcux_irq_tx_disable,
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.irq_tx_complete = uart_mcux_irq_tx_complete,
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.irq_tx_ready = uart_mcux_irq_tx_ready,
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.irq_rx_enable = uart_mcux_irq_rx_enable,
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.irq_rx_disable = uart_mcux_irq_rx_disable,
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.irq_rx_ready = uart_mcux_irq_rx_ready,
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.irq_err_enable = uart_mcux_irq_err_enable,
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.irq_err_disable = uart_mcux_irq_err_disable,
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.irq_is_pending = uart_mcux_irq_is_pending,
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.irq_update = uart_mcux_irq_update,
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.irq_callback_set = uart_mcux_irq_callback_set,
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#endif
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};
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#define UART_MCUX_DECLARE_CFG(n, IRQ_FUNC_INIT) \
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static const struct uart_mcux_config uart_mcux_##n##_config = { \
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.base = (UART_Type *)DT_INST_REG_ADDR(n), \
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.clock_name = DT_INST_CLOCKS_LABEL(n), \
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.clock_subsys = (clock_control_subsys_t)DT_INST_CLOCKS_CELL(n, name),\
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.uart_cfg = { \
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.stop_bits = UART_CFG_STOP_BITS_1, \
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.data_bits = UART_CFG_DATA_BITS_8, \
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.baudrate = DT_INST_PROP(n, current_speed), \
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.parity = UART_CFG_PARITY_NONE, \
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.flow_ctrl = DT_INST_PROP(n, hw_flow_control) ? \
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UART_CFG_FLOW_CTRL_RTS_CTS : UART_CFG_FLOW_CTRL_NONE,\
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}, \
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IRQ_FUNC_INIT \
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}
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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#define UART_MCUX_CONFIG_FUNC(n) \
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static void uart_mcux_config_func_##n(struct device *dev) \
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{ \
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IRQ_CONNECT(DT_INST_IRQ_BY_NAME(n, status, irq), \
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DT_INST_IRQ_BY_NAME(n, status, priority), \
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uart_mcux_isr, DEVICE_GET(uart_##n), 0); \
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\
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irq_enable(DT_INST_IRQ_BY_NAME(n, status, irq)); \
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\
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IRQ_CONNECT(DT_INST_IRQ_BY_NAME(n, error, irq), \
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DT_INST_IRQ_BY_NAME(n, error, priority), \
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uart_mcux_isr, DEVICE_GET(uart_##n), 0); \
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\
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irq_enable(DT_INST_IRQ_BY_NAME(n, error, irq)); \
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}
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#define UART_MCUX_IRQ_CFG_FUNC_INIT(n) \
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.irq_config_func = uart_mcux_config_func_##n
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#define UART_MCUX_INIT_CFG(n) \
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UART_MCUX_DECLARE_CFG(n, UART_MCUX_IRQ_CFG_FUNC_INIT(n))
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#else
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#define UART_MCUX_CONFIG_FUNC(n)
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#define UART_MCUX_IRQ_CFG_FUNC_INIT
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#define UART_MCUX_INIT_CFG(n) \
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UART_MCUX_DECLARE_CFG(n, UART_MCUX_IRQ_CFG_FUNC_INIT)
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#endif
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#define UART_MCUX_INIT(n) \
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\
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static struct uart_mcux_data uart_mcux_##n##_data; \
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\
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static const struct uart_mcux_config uart_mcux_##n##_config; \
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\
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DEVICE_AND_API_INIT(uart_##n, DT_INST_LABEL(n), \
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&uart_mcux_init, \
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&uart_mcux_##n##_data, \
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&uart_mcux_##n##_config, \
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PRE_KERNEL_1, \
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CONFIG_KERNEL_INIT_PRIORITY_DEVICE, \
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&uart_mcux_driver_api); \
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\
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UART_MCUX_CONFIG_FUNC(n) \
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\
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UART_MCUX_INIT_CFG(n);
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DT_INST_FOREACH_STATUS_OKAY(UART_MCUX_INIT)
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