1 /* stellarisUartDrv.c - Stellaris UART driver */
6  * Copyright (c) 2013-2015 Wind River Systems, Inc.
8  * SPDX-License-Identifier: Apache-2.0
15  * an 16550 in functionality, but is not register-compatible.
16  * It is also register-compatible with the UART found on TI CC2650 SoC,
19  * There is only support for poll-mode, so it can only be used with the printk
129 	const struct uart_stellaris_config *config = dev->config;  in baudrate_set()
132 	/* upon reset, the system clock uses the internal OSC @ 12MHz */  in baudrate_set()
147 	 * those registers are 32-bit, but the reserved bits should be  in baudrate_set()
150 	config->uart->ibrd = (uint16_t)(brdi & 0xffff); /* 16 bits */  in baudrate_set()
151 	config->uart->fbrd = (uint8_t)(brdf & 0x3f);    /* 6 bits */  in baudrate_set()
163 	const struct uart_stellaris_config *config = dev->config;  in enable()
165 	config->uart->ctl |= UARTCTL_UARTEN;  in enable()
169  * @brief Disable the UART
175 static inline void disable(const struct device *dev)  in disable()  function
177 	const struct uart_stellaris_config *config = dev->config;  in disable()
179 	config->uart->ctl &= ~UARTCTL_UARTEN;  in disable()
182 	while (config->uart->fr & UARTFR_BUSY) {  in disable()
186 	config->uart->lcrh &= ~UARTLCRH_FEN;  in disable()
191  * 8-bit frame
208 	const struct uart_stellaris_config *config = dev->config;  in line_control_defaults_set()
210 	config->uart->lcrh = LINE_CONTROL_DEFAULTS;  in line_control_defaults_set()
225 	struct uart_stellaris_dev_data_t *data = dev->data;  in uart_stellaris_init()
226 	const struct uart_stellaris_config *config = dev->config;  in uart_stellaris_init()
227 	disable(dev);  in uart_stellaris_init()
228 	baudrate_set(dev, data->baud_rate,  in uart_stellaris_init()
229 		     config->sys_clk_freq);  in uart_stellaris_init()
234 	config->irq_config_func(dev);  in uart_stellaris_init()
251 	const struct uart_stellaris_config *config = dev->config;  in poll_tx_ready()
253 	return (config->uart->fr & UARTFR_TXFE);  in poll_tx_ready()
262  * @return 0 if a character arrived, -1 if the input buffer if empty.
267 	const struct uart_stellaris_config *config = dev->config;  in uart_stellaris_poll_in()
269 	if (config->uart->fr & UARTFR_RXFE) {  in uart_stellaris_poll_in()
270 		return (-1);  in uart_stellaris_poll_in()
274 	*c = (unsigned char)config->uart->dr;  in uart_stellaris_poll_in()
291 	const struct uart_stellaris_config *config = dev->config;  in uart_stellaris_poll_out()
297 	config->uart->dr = (uint32_t)c;  in uart_stellaris_poll_out()
315 	const struct uart_stellaris_config *config = dev->config;  in uart_stellaris_fifo_fill()
318 	while ((len - num_tx > 0) && ((config->uart->fr & UARTFR_TXFF) == 0U)) {  in uart_stellaris_fifo_fill()
319 		config->uart->dr = (uint32_t)tx_data[num_tx++];  in uart_stellaris_fifo_fill()
338 	const struct uart_stellaris_config *config = dev->config;  in uart_stellaris_fifo_read()
341 	while ((size - num_rx > 0) && ((config->uart->fr & UARTFR_RXFE) == 0U)) {  in uart_stellaris_fifo_read()
342 		rx_data[num_rx++] = (uint8_t)config->uart->dr;  in uart_stellaris_fifo_read()
361 	const struct uart_stellaris_config *config = dev->config;  in uart_stellaris_irq_tx_enable()
374 		saved_ctl = config->uart->ctl;  in uart_stellaris_irq_tx_enable()
375 		saved_ibrd = config->uart->ibrd;  in uart_stellaris_irq_tx_enable()
376 		saved_fbrd = config->uart->fbrd;  in uart_stellaris_irq_tx_enable()
379 		disable(dev);  in uart_stellaris_irq_tx_enable()
380 		config->uart->fbrd = 0U;  in uart_stellaris_irq_tx_enable()
381 		config->uart->ibrd = 1U;  in uart_stellaris_irq_tx_enable()
382 		config->uart->lcrh = 0U;  in uart_stellaris_irq_tx_enable()
383 		config->uart->ctl = (UARTCTL_UARTEN | UARTCTL_TXEN | UARTCTL_LBE);  in uart_stellaris_irq_tx_enable()
384 		config->uart->dr = 0U;  in uart_stellaris_irq_tx_enable()
386 		while (config->uart->fr & UARTFR_BUSY) {  in uart_stellaris_irq_tx_enable()
390 		disable(dev);  in uart_stellaris_irq_tx_enable()
391 		config->uart->ibrd = saved_ibrd;  in uart_stellaris_irq_tx_enable()
392 		config->uart->fbrd = saved_fbrd;  in uart_stellaris_irq_tx_enable()
394 		config->uart->ctl = saved_ctl;  in uart_stellaris_irq_tx_enable()
397 	config->uart->im |= UARTTIM_TXIM;  in uart_stellaris_irq_tx_enable()
401  * @brief Disable TX interrupt in IER
407 	const struct uart_stellaris_config *config = dev->config;  in uart_stellaris_irq_tx_disable()
409 	config->uart->im &= ~UARTTIM_TXIM;  in uart_stellaris_irq_tx_disable()
421 	const struct uart_stellaris_config *config = dev->config;  in uart_stellaris_irq_tx_ready()
423 	return ((config->uart->mis & UARTMIS_TXMIS) == UARTMIS_TXMIS);  in uart_stellaris_irq_tx_ready()
433 	const struct uart_stellaris_config *config = dev->config;  in uart_stellaris_irq_rx_enable()
435 	config->uart->im |= UARTTIM_RXIM;  in uart_stellaris_irq_rx_enable()
439  * @brief Disable RX interrupt in IER
445 	const struct uart_stellaris_config *config = dev->config;  in uart_stellaris_irq_rx_disable()
447 	config->uart->im &= ~UARTTIM_RXIM;  in uart_stellaris_irq_rx_disable()
459 	const struct uart_stellaris_config *config = dev->config;  in uart_stellaris_irq_rx_ready()
461 	return ((config->uart->mis & UARTMIS_RXMIS) == UARTMIS_RXMIS);  in uart_stellaris_irq_rx_ready()
471 	const struct uart_stellaris_config *config = dev->config;  in uart_stellaris_irq_err_enable()
473 	config->uart->im |= (UARTTIM_RTIM | UARTTIM_FEIM | UARTTIM_PEIM |  in uart_stellaris_irq_err_enable()
478  * @brief Disable error interrupts
484 	const struct uart_stellaris_config *config = dev->config;  in uart_stellaris_irq_err_disable()
486 	config->uart->im &= ~(UARTTIM_RTIM | UARTTIM_FEIM | UARTTIM_PEIM |  in uart_stellaris_irq_err_disable()
499 	const struct uart_stellaris_config *config = dev->config;  in uart_stellaris_irq_is_pending()
502 	return ((config->uart->mis & (UARTMIS_RXMIS | UARTMIS_TXMIS)) ? 1 : 0);  in uart_stellaris_irq_is_pending()
527 	struct uart_stellaris_dev_data_t * const dev_data = dev->data;  in uart_stellaris_irq_callback_set()
529 	dev_data->cb = cb;  in uart_stellaris_irq_callback_set()
530 	dev_data->cb_data = cb_data;  in uart_stellaris_irq_callback_set()
542 	struct uart_stellaris_dev_data_t * const dev_data = dev->data;  in uart_stellaris_isr()
544 	if (dev_data->cb) {  in uart_stellaris_isr()
545 		dev_data->cb(dev, dev_data->cb_data);  in uart_stellaris_isr()