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drivers: serial: add amebadplus loguart driver
loguart driver for amebadplus Signed-off-by: zjian zhang <zjian_zhang@realsil.com.cn>
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‎drivers/serial/CMakeLists.txt

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@@ -21,6 +21,7 @@ zephyr_library_sources_ifdef(CONFIG_UART_AESC uart_aesc.c)
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zephyr_library_sources_ifdef(CONFIG_UART_ALTERA uart_altera.c)
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zephyr_library_sources_ifdef(CONFIG_UART_ALTERA_JTAG uart_altera_jtag.c)
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zephyr_library_sources_ifdef(CONFIG_UART_AMBIQ uart_ambiq.c)
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zephyr_library_sources_ifdef(CONFIG_UART_AMEBA_LOGUART uart_ameba_loguart.c)
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zephyr_library_sources_ifdef(CONFIG_UART_APBUART uart_apbuart.c)
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zephyr_library_sources_ifdef(CONFIG_UART_BCM2711_MU uart_bcm2711.c)
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zephyr_library_sources_ifdef(CONFIG_UART_BFLB uart_bflb.c)

‎drivers/serial/Kconfig

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@@ -161,6 +161,7 @@ rsource "Kconfig.aesc"
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rsource "Kconfig.altera"
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rsource "Kconfig.altera_jtag"
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rsource "Kconfig.ambiq"
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rsource "Kconfig.ameba_loguart"
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rsource "Kconfig.apbuart"
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rsource "Kconfig.b91"
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rsource "Kconfig.bcm2711"

‎drivers/serial/Kconfig.ameba_loguart

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# Copyright (c) 2024 Realtek Semiconductor Corp.
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# SPDX-License-Identifier: Apache-2.0
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config UART_AMEBA_LOGUART
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bool "Ameba LOGUART driver"
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default y
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depends on DT_HAS_REALTEK_AMEBA_LOGUART_ENABLED
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select SERIAL_HAS_DRIVER
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help
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This option enables the LOGUART driver for Realtek Ameba SoCs.

‎drivers/serial/uart_ameba_loguart.c

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/*
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* Copyright (c) 2024 Realtek Semiconductor Corp.
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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 Realtek Ameba LOGUART
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*/
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/* Include <soc.h> before <ameba_soc.h> to avoid redefining unlikely() macro */
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#include <soc.h>
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#include <ameba_soc.h>
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#include <zephyr/drivers/uart.h>
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#include <zephyr/drivers/clock_control.h>
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#include <zephyr/drivers/pinctrl.h>
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#include <zephyr/irq.h>
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(loguart_ameba, CONFIG_UART_LOG_LEVEL);
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/*
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* Extract information from devicetree.
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*
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* This driver only supports one instance of this IP block, so the
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* instance number is always 0.
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*/
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#define DT_DRV_COMPAT realtek_ameba_loguart
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/* Device config structure */
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struct loguart_ameba_config {
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#if defined(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 loguart_ameba_data {
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struct uart_config config;
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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uart_irq_callback_user_data_t user_cb;
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void *user_data;
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bool tx_int_en;
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bool rx_int_en;
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#endif
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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 loguart_ameba_poll_in(const struct device *dev, unsigned char *c)
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{
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ARG_UNUSED(dev);
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if (!LOGUART_Readable()) {
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return -1;
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}
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*c = LOGUART_GetChar(false);
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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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* @param dev UART device struct
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* @param c Character to send
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*/
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static void loguart_ameba_poll_out(const struct device *dev, unsigned char c)
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{
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ARG_UNUSED(dev);
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LOGUART_PutChar(c);
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}
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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static int loguart_ameba_fifo_fill(const struct device *dev, const uint8_t *tx_data, int len)
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{
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ARG_UNUSED(dev);
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uint8_t num_tx = 0U;
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unsigned int key;
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if (!LOGUART_Writable()) {
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return num_tx;
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}
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/* Lock interrupts to prevent nested interrupts or thread switch */
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key = irq_lock();
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while ((len - num_tx > 0) && LOGUART_Writable()) {
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LOGUART_PutChar((uint8_t)tx_data[num_tx++]);
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}
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irq_unlock(key);
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return num_tx;
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}
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static int loguart_ameba_fifo_read(const struct device *dev, uint8_t *rx_data, const int size)
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{
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ARG_UNUSED(dev);
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uint8_t num_rx = 0U;
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while ((size - num_rx > 0) && LOGUART_Readable()) {
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rx_data[num_rx++] = LOGUART_GetChar(false);
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}
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/* Clear timeout int flag */
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if (LOGUART_GetStatus(LOGUART_DEV) & LOGUART_BIT_TIMEOUT_INT) {
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LOGUART_INTClear(LOGUART_DEV, LOGUART_BIT_TOICF);
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}
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return num_rx;
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}
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static void loguart_ameba_irq_tx_enable(const struct device *dev)
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{
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u32 sts;
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struct loguart_ameba_data *data = dev->data;
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/* Disable IRQ Interrupts and Save Previous Status. */
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sts = irq_disable_save();
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data->tx_int_en = true;
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/* KM4: TX_PATH1 */
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LOGUART_INTConfig(LOGUART_DEV, LOGUART_TX_EMPTY_PATH_1_INTR, ENABLE);
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/* Enable IRQ Interrupts according to Previous Status. */
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irq_enable_restore(sts);
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}
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static void loguart_ameba_irq_tx_disable(const struct device *dev)
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{
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u32 sts;
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struct loguart_ameba_data *data = dev->data;
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/* Disable IRQ Interrupts and Save Previous Status. */
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sts = irq_disable_save();
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LOGUART_INTConfig(LOGUART_DEV, LOGUART_TX_EMPTY_PATH_1_INTR, DISABLE);
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data->tx_int_en = false;
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/* Enable IRQ Interrupts according to Previous Status. */
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irq_enable_restore(sts);
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}
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static int loguart_ameba_irq_tx_ready(const struct device *dev)
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{
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struct loguart_ameba_data *data = dev->data;
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/* KM4: TX_PATH1 */
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return (LOGUART_GetStatus(LOGUART_DEV) & LOGUART_BIT_TP1F_EMPTY) && data->tx_int_en;
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}
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static int loguart_ameba_irq_tx_complete(const struct device *dev)
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{
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return loguart_ameba_irq_tx_ready(dev);
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}
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static void loguart_ameba_irq_rx_enable(const struct device *dev)
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{
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struct loguart_ameba_data *data = dev->data;
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data->rx_int_en = true;
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LOGUART_INTConfig(LOGUART_DEV, LOGUART_BIT_ERBI | LOGUART_BIT_ETOI, ENABLE);
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}
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static void loguart_ameba_irq_rx_disable(const struct device *dev)
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{
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struct loguart_ameba_data *data = dev->data;
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data->rx_int_en = false;
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LOGUART_INTConfig(LOGUART_DEV, LOGUART_BIT_ERBI | LOGUART_BIT_ETOI, DISABLE);
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}
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static int loguart_ameba_irq_rx_ready(const struct device *dev)
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{
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struct loguart_ameba_data *data = dev->data;
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return (LOGUART_GetStatus(LOGUART_DEV) &
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(LOGUART_BIT_DRDY | LOGUART_BIT_RXFIFO_INT | LOGUART_BIT_TIMEOUT_INT)) &&
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data->rx_int_en;
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}
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static void loguart_ameba_irq_err_enable(const struct device *dev)
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{
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ARG_UNUSED(dev);
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LOGUART_INTConfig(LOGUART_DEV, LOGUART_BIT_ELSI, ENABLE);
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}
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static void loguart_ameba_irq_err_disable(const struct device *dev)
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{
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ARG_UNUSED(dev);
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LOGUART_INTConfig(LOGUART_DEV, LOGUART_BIT_ELSI, DISABLE);
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}
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static int loguart_ameba_irq_is_pending(const struct device *dev)
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{
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struct loguart_ameba_data *data = dev->data;
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return ((LOGUART_GetStatus(LOGUART_DEV) & LOGUART_BIT_TP1F_EMPTY) && data->tx_int_en) ||
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((LOGUART_GetStatus(LOGUART_DEV) &
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(LOGUART_BIT_DRDY | LOGUART_BIT_RXFIFO_INT | LOGUART_BIT_TIMEOUT_INT)) &&
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data->rx_int_en);
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}
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static int loguart_ameba_irq_update(const struct device *dev)
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{
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return 1;
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}
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static void loguart_ameba_irq_callback_set(const struct device *dev,
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uart_irq_callback_user_data_t cb, void *cb_data)
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{
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struct loguart_ameba_data *data = dev->data;
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data->user_cb = cb;
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data->user_data = cb_data;
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}
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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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 on success
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*/
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static int loguart_ameba_init(const struct device *dev)
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{
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LOGUART_RxCmd(LOGUART_DEV, DISABLE);
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LOGUART_INTCoreConfig(LOGUART_DEV, LOGUART_BIT_INTR_MASK_KM0, DISABLE);
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LOGUART_INTCoreConfig(LOGUART_DEV, LOGUART_BIT_INTR_MASK_KM4, ENABLE);
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#if defined(CONFIG_UART_INTERRUPT_DRIVEN)
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const struct loguart_ameba_config *config = dev->config;
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config->irq_config_func(dev);
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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LOGUART_RxCmd(LOGUART_DEV, ENABLE);
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return 0;
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}
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#if defined(CONFIG_UART_INTERRUPT_DRIVEN)
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#define AMEBA_LOGUART_IRQ_HANDLER_DECL \
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static void loguart_ameba_irq_config_func(const struct device *dev);
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#define AMEBA_LOGUART_IRQ_HANDLER \
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static void loguart_ameba_irq_config_func(const struct device *dev) \
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{ \
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IRQ_CONNECT(DT_INST_IRQN(0), DT_INST_IRQ(0, priority), loguart_ameba_isr, \
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DEVICE_DT_INST_GET(0), 0); \
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irq_enable(DT_INST_IRQN(0)); \
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}
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#define AMEBA_LOGUART_IRQ_HANDLER_FUNC .irq_config_func = loguart_ameba_irq_config_func,
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#else
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#define AMEBA_LOGUART_IRQ_HANDLER_DECL /* Not used */
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#define AMEBA_LOGUART_IRQ_HANDLER /* Not used */
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#define AMEBA_LOGUART_IRQ_HANDLER_FUNC /* Not used */
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#endif
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#if defined(CONFIG_UART_INTERRUPT_DRIVEN)
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static void loguart_ameba_isr(const struct device *dev)
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{
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struct loguart_ameba_data *data = dev->data;
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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if (data->user_cb) {
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data->user_cb(dev, data->user_data);
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}
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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}
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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static const struct uart_driver_api loguart_ameba_driver_api = {
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.poll_in = loguart_ameba_poll_in,
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.poll_out = loguart_ameba_poll_out,
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#ifdef CONFIG_UART_INTERRUPT_DRIVEN
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.fifo_fill = loguart_ameba_fifo_fill,
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.fifo_read = loguart_ameba_fifo_read,
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.irq_tx_enable = loguart_ameba_irq_tx_enable,
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.irq_tx_disable = loguart_ameba_irq_tx_disable,
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.irq_tx_ready = loguart_ameba_irq_tx_ready,
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.irq_rx_enable = loguart_ameba_irq_rx_enable,
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.irq_rx_disable = loguart_ameba_irq_rx_disable,
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.irq_tx_complete = loguart_ameba_irq_tx_complete,
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.irq_rx_ready = loguart_ameba_irq_rx_ready,
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.irq_err_enable = loguart_ameba_irq_err_enable,
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.irq_err_disable = loguart_ameba_irq_err_disable,
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.irq_is_pending = loguart_ameba_irq_is_pending,
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.irq_update = loguart_ameba_irq_update,
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.irq_callback_set = loguart_ameba_irq_callback_set,
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#endif /* CONFIG_UART_INTERRUPT_DRIVEN */
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};
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AMEBA_LOGUART_IRQ_HANDLER_DECL
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AMEBA_LOGUART_IRQ_HANDLER
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static const struct loguart_ameba_config loguart_config = {AMEBA_LOGUART_IRQ_HANDLER_FUNC};
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static struct loguart_ameba_data loguart_data = {.config = {
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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(0, current_speed),
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.parity = UART_CFG_PARITY_NONE,
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.flow_ctrl = UART_CFG_FLOW_CTRL_NONE,
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}};
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DEVICE_DT_INST_DEFINE(0, loguart_ameba_init, NULL, &loguart_data, &loguart_config, PRE_KERNEL_1,
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CONFIG_SERIAL_INIT_PRIORITY, &loguart_ameba_driver_api);

‎dts/bindings/serial/realtek,ameba-loguart.yaml

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# Copyright (c) 2024 Realtek Semiconductor Corp.
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# SPDX-License-Identifier: Apache-2.0
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description: Ameba LOGUART
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compatible: "realtek,ameba-loguart"
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include: [uart-controller.yaml, base.yaml, pinctrl-device.yaml]
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bus: uart
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properties:
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reg:
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required: true
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interrupts:
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required: true

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