2  * Copyright (c) 2018 - 2019 Antmicro <www.antmicro.com>
4  * SPDX-License-Identifier: Apache-2.0
14 #include <zephyr/drivers/uart.h>
33 	void (*config_func)(const struct device *dev);
50  * @param dev UART device struct
53 static void uart_litex_poll_out(const struct device *dev, unsigned char c)  in uart_litex_poll_out()  argument
55 	const struct uart_litex_device_config *config = dev->config;  in uart_litex_poll_out()
57 	while (litex_read8(config->txfull_addr)) {  in uart_litex_poll_out()
60 	litex_write8(c, config->rxtx_addr);  in uart_litex_poll_out()
66  * @param dev UART device struct
69  * @return 0 if a character arrived, -1 if the input buffer if empty.
71 static int uart_litex_poll_in(const struct device *dev, unsigned char *c)  in uart_litex_poll_in()  argument
73 	const struct uart_litex_device_config *config = dev->config;  in uart_litex_poll_in()
75 	if (!litex_read8(config->rxempty_addr)) {  in uart_litex_poll_in()
76 		*c = litex_read8(config->rxtx_addr);  in uart_litex_poll_in()
81 		litex_write8(UART_EV_RX, config->ev_pending_addr);  in uart_litex_poll_in()
84 		return -1;  in uart_litex_poll_in()
92  * @param dev UART device struct
94 static void uart_litex_irq_tx_enable(const struct device *dev)  in uart_litex_irq_tx_enable()  argument
96 	const struct uart_litex_device_config *config = dev->config;  in uart_litex_irq_tx_enable()
97 	struct uart_litex_data *data = dev->data;  in uart_litex_irq_tx_enable()
99 	uint8_t enable = litex_read8(config->ev_enable_addr);  in uart_litex_irq_tx_enable()
101 	litex_write8(enable | UART_EV_TX, config->ev_enable_addr);  in uart_litex_irq_tx_enable()
103 	if (!litex_read8(config->txfull_addr)) {  in uart_litex_irq_tx_enable()
109 		k_timer_start(&data->timer, K_NO_WAIT, K_NO_WAIT);  in uart_litex_irq_tx_enable()
116  * @param dev UART device struct
118 static void uart_litex_irq_tx_disable(const struct device *dev)  in uart_litex_irq_tx_disable()  argument
120 	const struct uart_litex_device_config *config = dev->config;  in uart_litex_irq_tx_disable()
122 	uint8_t enable = litex_read8(config->ev_enable_addr);  in uart_litex_irq_tx_disable()
124 	litex_write8(enable & ~(UART_EV_TX), config->ev_enable_addr);  in uart_litex_irq_tx_disable()
130  * @param dev UART device struct
132 static void uart_litex_irq_rx_enable(const struct device *dev)  in uart_litex_irq_rx_enable()  argument
134 	const struct uart_litex_device_config *config = dev->config;  in uart_litex_irq_rx_enable()
136 	uint8_t enable = litex_read8(config->ev_enable_addr);  in uart_litex_irq_rx_enable()
138 	litex_write8(enable | UART_EV_RX, config->ev_enable_addr);  in uart_litex_irq_rx_enable()
144  * @param dev UART device struct
146 static void uart_litex_irq_rx_disable(const struct device *dev)  in uart_litex_irq_rx_disable()  argument
148 	const struct uart_litex_device_config *config = dev->config;  in uart_litex_irq_rx_disable()
150 	uint8_t enable = litex_read8(config->ev_enable_addr);  in uart_litex_irq_rx_disable()
152 	litex_write8(enable & ~(UART_EV_RX), config->ev_enable_addr);  in uart_litex_irq_rx_disable()
156  * @brief Check if Tx IRQ has been raised and UART is ready to accept new data
158  * @param dev UART device struct
162 static int uart_litex_irq_tx_ready(const struct device *dev)  in uart_litex_irq_tx_ready()  argument
164 	const struct uart_litex_device_config *config = dev->config;  in uart_litex_irq_tx_ready()
166 	uint8_t val = litex_read8(config->txfull_addr);  in uart_litex_irq_tx_ready()
172  * @brief Check if Rx IRQ has been raised and there's data to be read from UART
174  * @param dev UART device struct
178 static int uart_litex_irq_rx_ready(const struct device *dev)  in uart_litex_irq_rx_ready()  argument
180 	const struct uart_litex_device_config *config = dev->config;  in uart_litex_irq_rx_ready()
183 	pending = litex_read8(config->ev_pending_addr);  in uart_litex_irq_rx_ready()
195  * @param dev UART device struct
201 static int uart_litex_fifo_fill(const struct device *dev,  in uart_litex_fifo_fill()  argument
204 	const struct uart_litex_device_config *config = dev->config;  in uart_litex_fifo_fill()
207 	for (i = 0; i < size && !litex_read8(config->txfull_addr); i++) {  in uart_litex_fifo_fill()
208 		litex_write8(tx_data[i], config->rxtx_addr);  in uart_litex_fifo_fill()
217  * @param dev UART device struct
223 static int uart_litex_fifo_read(const struct device *dev,  in uart_litex_fifo_read()  argument
226 	const struct uart_litex_device_config *config = dev->config;  in uart_litex_fifo_read()
229 	for (i = 0; i < size && !litex_read8(config->rxempty_addr); i++) {  in uart_litex_fifo_read()
230 		rx_data[i] = litex_read8(config->rxtx_addr);  in uart_litex_fifo_read()
235 		litex_write8(UART_EV_RX, config->ev_pending_addr);  in uart_litex_fifo_read()
241 static void uart_litex_irq_err(const struct device *dev)  in uart_litex_irq_err()  argument
243 	ARG_UNUSED(dev);  in uart_litex_irq_err()
249  * @param dev UART device struct
253 static int uart_litex_irq_is_pending(const struct device *dev)  in uart_litex_irq_is_pending()  argument
255 	return (uart_litex_irq_tx_ready(dev) || uart_litex_irq_rx_ready(dev));  in uart_litex_irq_is_pending()
258 static int uart_litex_irq_update(const struct device *dev)  in uart_litex_irq_update()  argument
266  * @param dev UART device struct
269 static void uart_litex_irq_callback_set(const struct device *dev,  in uart_litex_irq_callback_set()  argument
275 	data = dev->data;  in uart_litex_irq_callback_set()
276 	data->callback = cb;  in uart_litex_irq_callback_set()
277 	data->cb_data = cb_data;  in uart_litex_irq_callback_set()
280 static void uart_litex_irq_handler(const struct device *dev)  in uart_litex_irq_handler()  argument
282 	const struct uart_litex_device_config *config = dev->config;  in uart_litex_irq_handler()
283 	struct uart_litex_data *data = dev->data;  in uart_litex_irq_handler()
286 	if (data->callback) {  in uart_litex_irq_handler()
287 		data->callback(dev, data->cb_data);  in uart_litex_irq_handler()
291 	litex_write8(UART_EV_RX, config->ev_pending_addr);  in uart_litex_irq_handler()
298 	const struct device *dev = k_timer_user_data_get(timer);  in uart_litex_tx_soft_isr()  local
300 	uart_litex_irq_handler(dev);  in uart_litex_tx_soft_isr()
304 static DEVICE_API(uart, uart_litex_driver_api) = {
325 static int uart_litex_init(const struct device *dev)  in uart_litex_init()  argument
327 	const struct uart_litex_device_config *config = dev->config;  in uart_litex_init()
329 	litex_write8(UART_EV_TX | UART_EV_RX, config->ev_pending_addr);  in uart_litex_init()
332 	struct uart_litex_data *data = dev->data;  in uart_litex_init()
334 	k_timer_init(&data->timer, &uart_litex_tx_soft_isr, NULL);  in uart_litex_init()
335 	k_timer_user_data_set(&data->timer, (void *)dev);  in uart_litex_init()
337 	config->config_func(dev);  in uart_litex_init()
344 	static void uart_irq_config##n(const struct device *dev)                                   \