118 	struct uart_port port;  member
126 static void stm32_stop_tx(struct uart_port *port);
128 static inline struct stm32_port *to_stm32_port(struct uart_port *port)  in to_stm32_port()  argument
130 	return container_of(port, struct stm32_port, port);  in to_stm32_port()
133 static void stm32_set_bits(struct uart_port *port, u32 reg, u32 bits)  in stm32_set_bits()  argument
137 	val = readl_relaxed(port->membase + reg);  in stm32_set_bits()
139 	writel_relaxed(val, port->membase + reg);  in stm32_set_bits()
142 static void stm32_clr_bits(struct uart_port *port, u32 reg, u32 bits)  in stm32_clr_bits()  argument
146 	val = readl_relaxed(port->membase + reg);  in stm32_clr_bits()
148 	writel_relaxed(val, port->membase + reg);  in stm32_clr_bits()
151 static void stm32_receive_chars(struct uart_port *port)  in stm32_receive_chars()  argument
153 	struct tty_port *tport = &port->state->port;  in stm32_receive_chars()
158 	if (port->irq_wake)  in stm32_receive_chars()
161 	while ((sr = readl_relaxed(port->membase + USART_SR)) & USART_SR_RXNE) {  in stm32_receive_chars()
163 		c = readl_relaxed(port->membase + USART_DR);  in stm32_receive_chars()
165 		port->icount.rx++;  in stm32_receive_chars()
169 				port->icount.brk++;  in stm32_receive_chars()
170 				if (uart_handle_break(port))  in stm32_receive_chars()
173 				port->icount.overrun++;  in stm32_receive_chars()
175 				port->icount.parity++;  in stm32_receive_chars()
177 				port->icount.frame++;  in stm32_receive_chars()
180 			sr &= port->read_status_mask;  in stm32_receive_chars()
190 		if (uart_handle_sysrq_char(port, c))  in stm32_receive_chars()
192 		uart_insert_char(port, sr, USART_SR_ORE, c, flag);  in stm32_receive_chars()
195 	spin_unlock(&port->lock);  in stm32_receive_chars()
197 	spin_lock(&port->lock);  in stm32_receive_chars()
200 static void stm32_transmit_chars(struct uart_port *port)  in stm32_transmit_chars()  argument
202 	struct circ_buf *xmit = &port->state->xmit;  in stm32_transmit_chars()
204 	if (port->x_char) {  in stm32_transmit_chars()
205 		writel_relaxed(port->x_char, port->membase + USART_DR);  in stm32_transmit_chars()
206 		port->x_char = 0;  in stm32_transmit_chars()
207 		port->icount.tx++;  in stm32_transmit_chars()
211 	if (uart_tx_stopped(port)) {  in stm32_transmit_chars()
212 		stm32_stop_tx(port);  in stm32_transmit_chars()
217 		stm32_stop_tx(port);  in stm32_transmit_chars()
221 	writel_relaxed(xmit->buf[xmit->tail], port->membase + USART_DR);  in stm32_transmit_chars()
223 	port->icount.tx++;  in stm32_transmit_chars()
226 		uart_write_wakeup(port);  in stm32_transmit_chars()
229 		stm32_stop_tx(port);  in stm32_transmit_chars()
234 	struct uart_port *port = ptr;  in stm32_interrupt()  local
237 	spin_lock(&port->lock);  in stm32_interrupt()
239 	sr = readl_relaxed(port->membase + USART_SR);  in stm32_interrupt()
242 		stm32_receive_chars(port);  in stm32_interrupt()
245 		stm32_transmit_chars(port);  in stm32_interrupt()
247 	spin_unlock(&port->lock);  in stm32_interrupt()
252 static unsigned int stm32_tx_empty(struct uart_port *port)  in stm32_tx_empty()  argument
254 	return readl_relaxed(port->membase + USART_SR) & USART_SR_TXE;  in stm32_tx_empty()
257 static void stm32_set_mctrl(struct uart_port *port, unsigned int mctrl)  in stm32_set_mctrl()  argument
259 	if ((mctrl & TIOCM_RTS) && (port->status & UPSTAT_AUTORTS))  in stm32_set_mctrl()
260 		stm32_set_bits(port, USART_CR3, USART_CR3_RTSE);  in stm32_set_mctrl()
262 		stm32_clr_bits(port, USART_CR3, USART_CR3_RTSE);  in stm32_set_mctrl()
265 static unsigned int stm32_get_mctrl(struct uart_port *port)  in stm32_get_mctrl()  argument
272 static void stm32_stop_tx(struct uart_port *port)  in stm32_stop_tx()  argument
274 	stm32_clr_bits(port, USART_CR1, USART_CR1_TXEIE);  in stm32_stop_tx()
278 static void stm32_start_tx(struct uart_port *port)  in stm32_start_tx()  argument
280 	struct circ_buf *xmit = &port->state->xmit;  in stm32_start_tx()
285 	stm32_set_bits(port, USART_CR1, USART_CR1_TXEIE | USART_CR1_TE);  in stm32_start_tx()
289 static void stm32_throttle(struct uart_port *port)  in stm32_throttle()  argument
293 	spin_lock_irqsave(&port->lock, flags);  in stm32_throttle()
294 	stm32_clr_bits(port, USART_CR1, USART_CR1_RXNEIE);  in stm32_throttle()
295 	spin_unlock_irqrestore(&port->lock, flags);  in stm32_throttle()
299 static void stm32_unthrottle(struct uart_port *port)  in stm32_unthrottle()  argument
303 	spin_lock_irqsave(&port->lock, flags);  in stm32_unthrottle()
304 	stm32_set_bits(port, USART_CR1, USART_CR1_RXNEIE);  in stm32_unthrottle()
305 	spin_unlock_irqrestore(&port->lock, flags);  in stm32_unthrottle()
309 static void stm32_stop_rx(struct uart_port *port)  in stm32_stop_rx()  argument
311 	stm32_clr_bits(port, USART_CR1, USART_CR1_RXNEIE);  in stm32_stop_rx()
315 static void stm32_break_ctl(struct uart_port *port, int break_state)  in stm32_break_ctl()  argument
319 static int stm32_startup(struct uart_port *port)  in stm32_startup()  argument
321 	const char *name = to_platform_device(port->dev)->name;  in stm32_startup()
325 	ret = request_irq(port->irq, stm32_interrupt, 0, name, port);  in stm32_startup()
330 	stm32_set_bits(port, USART_CR1, val);  in stm32_startup()
335 static void stm32_shutdown(struct uart_port *port)  in stm32_shutdown()  argument
340 	stm32_set_bits(port, USART_CR1, val);  in stm32_shutdown()
342 	free_irq(port->irq, port);  in stm32_shutdown()
345 static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,  in stm32_set_termios()  argument
348 	struct stm32_port *stm32_port = to_stm32_port(port);  in stm32_set_termios()
358 	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 8);  in stm32_set_termios()
360 	spin_lock_irqsave(&port->lock, flags);  in stm32_set_termios()
363 	writel_relaxed(0, port->membase + USART_CR1);  in stm32_set_termios()
381 	port->status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS);  in stm32_set_termios()
383 		port->status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS;  in stm32_set_termios()
387 	usartdiv = DIV_ROUND_CLOSEST(port->uartclk, baud);  in stm32_set_termios()
397 		stm32_set_bits(port, USART_CR1, USART_CR1_OVER8);  in stm32_set_termios()
400 		stm32_clr_bits(port, USART_CR1, USART_CR1_OVER8);  in stm32_set_termios()
405 	writel_relaxed(mantissa | fraction, port->membase + USART_BRR);  in stm32_set_termios()
407 	uart_update_timeout(port, cflag, baud);  in stm32_set_termios()
409 	port->read_status_mask = USART_SR_ORE;  in stm32_set_termios()
411 		port->read_status_mask |= USART_SR_PE | USART_SR_FE;  in stm32_set_termios()
413 		port->read_status_mask |= USART_SR_LBD;  in stm32_set_termios()
416 	port->ignore_status_mask = 0;  in stm32_set_termios()
418 		port->ignore_status_mask = USART_SR_PE | USART_SR_FE;  in stm32_set_termios()
420 		port->ignore_status_mask |= USART_SR_LBD;  in stm32_set_termios()
426 			port->ignore_status_mask |= USART_SR_ORE;  in stm32_set_termios()
431 		port->ignore_status_mask |= USART_SR_DUMMY_RX;  in stm32_set_termios()
433 	writel_relaxed(cr3, port->membase + USART_CR3);  in stm32_set_termios()
434 	writel_relaxed(cr2, port->membase + USART_CR2);  in stm32_set_termios()
435 	writel_relaxed(cr1, port->membase + USART_CR1);  in stm32_set_termios()
437 	spin_unlock_irqrestore(&port->lock, flags);  in stm32_set_termios()
440 static const char *stm32_type(struct uart_port *port)  in stm32_type()  argument
442 	return (port->type == PORT_STM32) ? DRIVER_NAME : NULL;  in stm32_type()
445 static void stm32_release_port(struct uart_port *port)  in stm32_release_port()  argument
449 static int stm32_request_port(struct uart_port *port)  in stm32_request_port()  argument
454 static void stm32_config_port(struct uart_port *port, int flags)  in stm32_config_port()  argument
457 		port->type = PORT_STM32;  in stm32_config_port()
461 stm32_verify_port(struct uart_port *port, struct serial_struct *ser)  in stm32_verify_port()  argument
467 static void stm32_pm(struct uart_port *port, unsigned int state,  in stm32_pm()  argument
470 	struct stm32_port *stm32port = container_of(port,  in stm32_pm()
471 			struct stm32_port, port);  in stm32_pm()
479 		spin_lock_irqsave(&port->lock, flags);  in stm32_pm()
480 		stm32_clr_bits(port, USART_CR1, USART_CR1_UE);  in stm32_pm()
481 		spin_unlock_irqrestore(&port->lock, flags);  in stm32_pm()
511 	struct uart_port *port = &stm32port->port;  in stm32_init_port()  local
515 	port->iotype	= UPIO_MEM;  in stm32_init_port()
516 	port->flags	= UPF_BOOT_AUTOCONF;  in stm32_init_port()
517 	port->ops	= &stm32_uart_ops;  in stm32_init_port()
518 	port->dev	= &pdev->dev;  in stm32_init_port()
519 	port->irq	= platform_get_irq(pdev, 0);  in stm32_init_port()
522 	port->membase = devm_ioremap_resource(&pdev->dev, res);  in stm32_init_port()
523 	if (IS_ERR(port->membase))  in stm32_init_port()
524 		return PTR_ERR(port->membase);  in stm32_init_port()
525 	port->mapbase = res->start;  in stm32_init_port()
527 	spin_lock_init(&port->lock);  in stm32_init_port()
538 	stm32port->port.uartclk = clk_get_rate(stm32port->clk);  in stm32_init_port()
539 	if (!stm32port->port.uartclk)  in stm32_init_port()
564 	stm32_ports[id].port.line = id;  in stm32_of_get_stm32_port()
591 	ret = uart_add_one_port(&stm32_usart_driver, &stm32port->port);  in stm32_serial_probe()
595 	platform_set_drvdata(pdev, &stm32port->port);  in stm32_serial_probe()
602 	struct uart_port *port = platform_get_drvdata(pdev);  in stm32_serial_remove()  local
604 	return uart_remove_one_port(&stm32_usart_driver, port);  in stm32_serial_remove()
609 static void stm32_console_putchar(struct uart_port *port, int ch)  in stm32_console_putchar()  argument
611 	while (!(readl_relaxed(port->membase + USART_SR) & USART_SR_TXE))  in stm32_console_putchar()
614 	writel_relaxed(ch, port->membase + USART_DR);  in stm32_console_putchar()
619 	struct uart_port *port = &stm32_ports[co->index].port;  in stm32_console_write()  local
625 	if (port->sysrq)  in stm32_console_write()
628 		locked = spin_trylock(&port->lock);  in stm32_console_write()
630 		spin_lock(&port->lock);  in stm32_console_write()
633 	old_cr1 = readl_relaxed(port->membase + USART_CR1);  in stm32_console_write()
635 	writel_relaxed(new_cr1, port->membase + USART_CR1);  in stm32_console_write()
637 	uart_console_write(port, s, cnt, stm32_console_putchar);  in stm32_console_write()
640 	writel_relaxed(old_cr1, port->membase + USART_CR1);  in stm32_console_write()
643 		spin_unlock(&port->lock);  in stm32_console_write()
666 	if (stm32port->port.mapbase == 0 || stm32port->port.membase == NULL)  in stm32_console_setup()
672 	return uart_set_options(&stm32port->port, co, baud, parity, bits, flow);  in stm32_console_setup()