96 struct uart_8250_port {  struct
97 	struct uart_port	port;
98 	struct timer_list	timer;		/* "no irq" timer */
99 	struct list_head	list;		/* ports on this IRQ */
100 	u32			capabilities;	/* port capabilities */
101 	unsigned short		bugs;		/* port bugs */
102 	bool			fifo_bug;	/* min RX trigger if enabled */
103 	unsigned int		tx_loadsz;	/* transmit fifo load size */
104 	unsigned char		acr;
105 	unsigned char		fcr;
106 	unsigned char		ier;
107 	unsigned char		lcr;
108 	unsigned char		mcr;
109 	unsigned char		mcr_mask;	/* mask of user bits */
133 	int			(*dl_read)(struct uart_8250_port *);  argument
134 	void			(*dl_write)(struct uart_8250_port *, int);  argument
139 static inline struct uart_8250_port *up_to_u8250p(struct uart_port *up)  in up_to_u8250p()  argument