2  * Copyright (c) 2017 Jean-Paul Etienne <fractalclone@gmail.com>
4  * SPDX-License-Identifier: Apache-2.0
8  * @brief UART driver for the SiFive Freedom Processor
15 #include <zephyr/drivers/uart.h>
71 #define DEV_UART(dev)						\  argument
73 	 ((const struct uart_sifive_device_config * const)(dev)->config)->port)
80  * @param dev UART device struct
83 static void uart_sifive_poll_out(const struct device *dev,  in uart_sifive_poll_out()  argument
86 	volatile struct uart_sifive_regs_t *uart = DEV_UART(dev);  in uart_sifive_poll_out()  local
89 	while (uart->tx & TXDATA_FULL) {  in uart_sifive_poll_out()
92 	uart->tx = (int)c;  in uart_sifive_poll_out()
98  * @param dev UART device struct
101  * @return 0 if a character arrived, -1 if the input buffer if empty.
103 static int uart_sifive_poll_in(const struct device *dev, unsigned char *c)  in uart_sifive_poll_in()  argument
105 	volatile struct uart_sifive_regs_t *uart = DEV_UART(dev);  in uart_sifive_poll_in()  local
106 	uint32_t val = uart->rx;  in uart_sifive_poll_in()
109 		return -1;  in uart_sifive_poll_in()
122  * @param dev UART device struct
128 static int uart_sifive_fifo_fill(const struct device *dev,  in uart_sifive_fifo_fill()  argument
132 	volatile struct uart_sifive_regs_t *uart = DEV_UART(dev);  in uart_sifive_fifo_fill()  local
135 	for (i = 0; i < size && !(uart->tx & TXDATA_FULL); i++) {  in uart_sifive_fifo_fill()
136 		uart->tx = (int)tx_data[i];  in uart_sifive_fifo_fill()
145  * @param dev UART device struct
151 static int uart_sifive_fifo_read(const struct device *dev,  in uart_sifive_fifo_read()  argument
155 	volatile struct uart_sifive_regs_t *uart = DEV_UART(dev);  in uart_sifive_fifo_read()  local
160 		val = uart->rx;  in uart_sifive_fifo_read()
175  * @param dev UART device struct
177 static void uart_sifive_irq_tx_enable(const struct device *dev)  in uart_sifive_irq_tx_enable()  argument
179 	volatile struct uart_sifive_regs_t *uart = DEV_UART(dev);  in uart_sifive_irq_tx_enable()  local
181 	uart->ie |= IE_TXWM;  in uart_sifive_irq_tx_enable()
187  * @param dev UART device struct
189 static void uart_sifive_irq_tx_disable(const struct device *dev)  in uart_sifive_irq_tx_disable()  argument
191 	volatile struct uart_sifive_regs_t *uart = DEV_UART(dev);  in uart_sifive_irq_tx_disable()  local
193 	uart->ie &= ~IE_TXWM;  in uart_sifive_irq_tx_disable()
199  * @param dev UART device struct
203 static int uart_sifive_irq_tx_ready(const struct device *dev)  in uart_sifive_irq_tx_ready()  argument
205 	volatile struct uart_sifive_regs_t *uart = DEV_UART(dev);  in uart_sifive_irq_tx_ready()  local
207 	return !!(uart->ip & IE_TXWM);  in uart_sifive_irq_tx_ready()
213  * @param dev UART device struct
217 static int uart_sifive_irq_tx_complete(const struct device *dev)  in uart_sifive_irq_tx_complete()  argument
219 	volatile struct uart_sifive_regs_t *uart = DEV_UART(dev);  in uart_sifive_irq_tx_complete()  local
225 	return !(uart->tx & TXDATA_FULL);  in uart_sifive_irq_tx_complete()
231  * @param dev UART device struct
233 static void uart_sifive_irq_rx_enable(const struct device *dev)  in uart_sifive_irq_rx_enable()  argument
235 	volatile struct uart_sifive_regs_t *uart = DEV_UART(dev);  in uart_sifive_irq_rx_enable()  local
237 	uart->ie |= IE_RXWM;  in uart_sifive_irq_rx_enable()
243  * @param dev UART device struct
245 static void uart_sifive_irq_rx_disable(const struct device *dev)  in uart_sifive_irq_rx_disable()  argument
247 	volatile struct uart_sifive_regs_t *uart = DEV_UART(dev);  in uart_sifive_irq_rx_disable()  local
249 	uart->ie &= ~IE_RXWM;  in uart_sifive_irq_rx_disable()
255  * @param dev UART device struct
259 static int uart_sifive_irq_rx_ready(const struct device *dev)  in uart_sifive_irq_rx_ready()  argument
261 	volatile struct uart_sifive_regs_t *uart = DEV_UART(dev);  in uart_sifive_irq_rx_ready()  local
263 	return !!(uart->ip & IE_RXWM);  in uart_sifive_irq_rx_ready()
267 static void uart_sifive_irq_err_enable(const struct device *dev)  in uart_sifive_irq_err_enable()  argument
269 	ARG_UNUSED(dev);  in uart_sifive_irq_err_enable()
272 static void uart_sifive_irq_err_disable(const struct device *dev)  in uart_sifive_irq_err_disable()  argument
274 	ARG_UNUSED(dev);  in uart_sifive_irq_err_disable()
280  * @param dev UART device struct
284 static int uart_sifive_irq_is_pending(const struct device *dev)  in uart_sifive_irq_is_pending()  argument
286 	volatile struct uart_sifive_regs_t *uart = DEV_UART(dev);  in uart_sifive_irq_is_pending()  local
288 	return !!(uart->ip & (IE_RXWM | IE_TXWM));  in uart_sifive_irq_is_pending()
291 static int uart_sifive_irq_update(const struct device *dev)  in uart_sifive_irq_update()  argument
299  * @param dev UART device struct
302 static void uart_sifive_irq_callback_set(const struct device *dev,  in uart_sifive_irq_callback_set()  argument
306 	struct uart_sifive_data *data = dev->data;  in uart_sifive_irq_callback_set()
308 	data->callback = cb;  in uart_sifive_irq_callback_set()
309 	data->cb_data = cb_data;  in uart_sifive_irq_callback_set()
312 static void uart_sifive_irq_handler(const struct device *dev)  in uart_sifive_irq_handler()  argument
314 	struct uart_sifive_data *data = dev->data;  in uart_sifive_irq_handler()
316 	if (data->callback) {  in uart_sifive_irq_handler()
317 		data->callback(dev, data->cb_data);  in uart_sifive_irq_handler()
324 static int uart_sifive_init(const struct device *dev)  in uart_sifive_init()  argument
326 	const struct uart_sifive_device_config * const cfg = dev->config;  in uart_sifive_init()
327 	volatile struct uart_sifive_regs_t *uart = DEV_UART(dev);  in uart_sifive_init()  local
333 	uart->txctrl = TXCTRL_TXEN | CTRL_CNT(cfg->txcnt_irq);  in uart_sifive_init()
334 	uart->rxctrl = RXCTRL_RXEN | CTRL_CNT(cfg->rxcnt_irq);  in uart_sifive_init()
337 	uart->div = cfg->sys_clk_freq / cfg->baud_rate - 1;  in uart_sifive_init()
340 	/* Ensure that uart IRQ is disabled initially */  in uart_sifive_init()
341 	uart->ie = 0U;  in uart_sifive_init()
344 	cfg->cfg_func();  in uart_sifive_init()
348 	ret = pinctrl_apply_state(cfg->pcfg, PINCTRL_STATE_DEFAULT);  in uart_sifive_init()
357 static DEVICE_API(uart, uart_sifive_driver_api) = {