1 /* SPDX-License-Identifier: GPL-2.0-or-later */
5  *  Copyright (C) 2000 Deep Blue Solutions Ltd.
24 	((port)->cons && (port)->cons->index == (port)->line)
36  * physical hardware.  See Documentation/driver-api/serial/driver.rst for details.
149 #define UPIO_MEM		(SERIAL_IO_MEM)		/* driver-specific */
175 	 * The remaining bits are serial-core specific and not modifiable by
194 /* Port has hardware-assisted h/w flow control */
198 /* Port has hardware-assisted s/w flow control */
216 #error Change mask not equivalent to userspace-visible bit defines
232 	int			hw_stopped;		/* sw-assisted CTS flow state */
234 	unsigned int		timeout;		/* character-based timeout */
263 	return up->serial_in(up, offset);  in serial_port_in()
268 	up->serial_out(up, offset, value);  in serial_port_out()
272  * enum uart_pm_state - power states for UARTs
317 	 * touch these; they should be initialised to NULL
338 	int timeout = port->timeout;  in uart_poll_timeout()
340 	return timeout > 6 ? (timeout / 2 - 2) : 1;  in uart_poll_timeout()
420 #define uart_circ_empty(circ)		((circ)->head == (circ)->tail)
421 #define uart_circ_clear(circ)		((circ)->head = (circ)->tail = 0)
424 	(CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
427 	(CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
431 	struct tty_struct *tty = port->state->port.tty;  in uart_tx_stopped()
432 	if ((tty && tty->flow.stopped) || port->hw_stopped)  in uart_tx_stopped()
439 	return !!(uport->status & UPSTAT_CTS_ENABLE);  in uart_cts_enabled()
446 	return ((uport->status & mask) == UPSTAT_CTS_ENABLE);  in uart_softcts_mode()
468 	if (!port->sysrq)  in uart_handle_sysrq_char()
471 	if (ch && time_before(jiffies, port->sysrq)) {  in uart_handle_sysrq_char()
474 			port->sysrq = 0;  in uart_handle_sysrq_char()
480 	port->sysrq = 0;  in uart_handle_sysrq_char()
487 	if (!port->sysrq)  in uart_prepare_sysrq_char()
490 	if (ch && time_before(jiffies, port->sysrq)) {  in uart_prepare_sysrq_char()
492 			port->sysrq_ch = ch;  in uart_prepare_sysrq_char()
493 			port->sysrq = 0;  in uart_prepare_sysrq_char()
499 	port->sysrq = 0;  in uart_prepare_sysrq_char()
508 	if (!port->has_sysrq) {  in uart_unlock_and_check_sysrq()
509 		spin_unlock(&port->lock);  in uart_unlock_and_check_sysrq()
513 	sysrq_ch = port->sysrq_ch;  in uart_unlock_and_check_sysrq()
514 	port->sysrq_ch = 0;  in uart_unlock_and_check_sysrq()
516 	spin_unlock(&port->lock);  in uart_unlock_and_check_sysrq()
527 	if (!port->has_sysrq) {  in uart_unlock_and_check_sysrq_irqrestore()
528 		spin_unlock_irqrestore(&port->lock, flags);  in uart_unlock_and_check_sysrq_irqrestore()
532 	sysrq_ch = port->sysrq_ch;  in uart_unlock_and_check_sysrq_irqrestore()
533 	port->sysrq_ch = 0;  in uart_unlock_and_check_sysrq_irqrestore()
535 	spin_unlock_irqrestore(&port->lock, flags);  in uart_unlock_and_check_sysrq_irqrestore()
551 	spin_unlock(&port->lock);  in uart_unlock_and_check_sysrq()
556 	spin_unlock_irqrestore(&port->lock, flags);  in uart_unlock_and_check_sysrq_irqrestore()
565 	struct uart_state *state = port->state;  in uart_handle_break()
567 	if (port->handle_break)  in uart_handle_break()
568 		port->handle_break(port);  in uart_handle_break()
571 	if (port->has_sysrq && uart_console(port)) {  in uart_handle_break()
572 		if (!port->sysrq) {  in uart_handle_break()
573 			port->sysrq = jiffies + SYSRQ_TIMEOUT;  in uart_handle_break()
576 		port->sysrq = 0;  in uart_handle_break()
579 	if (port->flags & UPF_SAK)  in uart_handle_break()
580 		do_SAK(state->port.tty);  in uart_handle_break()
585  *	UART_ENABLE_MS - determine if port should enable modem status irqs
587 #define UART_ENABLE_MS(port,cflag)	((port)->flags & UPF_HARDPPS_CD || \