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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/include/linux/serial_8250.h
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@@ -1,16 +1,13 @@
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
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 /*
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  *  linux/include/linux/serial_8250.h
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  *
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  *  Copyright (C) 2004 Russell King
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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  */
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 #ifndef _LINUX_SERIAL_8250_H
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 #define _LINUX_SERIAL_8250_H
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+#include <linux/atomic.h>
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 #include <linux/serial_core.h>
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 #include <linux/serial_reg.h>
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 #include <linux/platform_device.h>
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@@ -29,6 +26,7 @@
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 	unsigned char	regshift;	/* register shift */
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 	unsigned char	iotype;		/* UPIO_* */
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 	unsigned char	hub6;
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+	unsigned char	has_sysrq;	/* supports magic SysRq */
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 	upf_t		flags;		/* UPF_* flags */
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 	unsigned int	type;		/* If UPF_FIXED_TYPE */
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 	unsigned int	(*serial_in)(struct uart_port *, int);
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@@ -84,6 +82,7 @@
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 	struct hrtimer		stop_tx_timer;  /* "rs485 stop tx" timer */
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 	struct hrtimer		*active_timer;  /* pointer to active timer */
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 	struct uart_8250_port	*port;          /* for hrtimer callbacks */
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+	unsigned int		tx_stopped:1;	/* tx is currently stopped */
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 };
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 /*
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@@ -114,6 +113,7 @@
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 						 *   if no_console_suspend
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 						 */
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 	unsigned char		probe;
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+	struct mctrl_gpios	*gpios;
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 #define UART_PROBE_RSA	(1 << 0)
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 	/*
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@@ -126,6 +126,8 @@
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 #define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
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 	unsigned char		msr_saved_flags;
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+	atomic_t		console_printing;
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+
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 	struct uart_8250_dma	*dma;
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 	const struct uart_8250_ops *ops;
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@@ -134,6 +136,8 @@
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 	void			(*dl_write)(struct uart_8250_port *, int);
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 	struct uart_8250_em485 *em485;
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+	void			(*rs485_start_tx)(struct uart_8250_port *);
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+	void			(*rs485_stop_tx)(struct uart_8250_port *);
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 	/* Serial port overrun backoff */
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 	struct delayed_work overrun_backoff;
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@@ -154,6 +158,8 @@
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 extern int early_serial8250_setup(struct earlycon_device *device,
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 					 const char *options);
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+extern void serial8250_update_uartclk(struct uart_port *port,
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+				      unsigned int uartclk);
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 extern void serial8250_do_set_termios(struct uart_port *port,
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 		struct ktermios *termios, struct ktermios *old);
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 extern void serial8250_do_set_ldisc(struct uart_port *port,
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@@ -177,7 +183,10 @@
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 void serial8250_set_defaults(struct uart_8250_port *up);
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 void serial8250_console_write(struct uart_8250_port *up, const char *s,
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 			      unsigned int count);
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+void serial8250_console_write_atomic(struct uart_8250_port *up, const char *s,
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+				     unsigned int count);
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 int serial8250_console_setup(struct uart_port *port, char *options, bool probe);
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+int serial8250_console_exit(struct uart_port *port);
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 extern void serial8250_set_isa_configurator(void (*v)
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 					(int port, struct uart_port *up,