[deliverable/linux.git] / include / linux / serial_core.h

/*
 *  linux/drivers/char/serial_core.h
 *
 *  Copyright (C) 2000 Deep Blue Solutions Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#ifndef LINUX_SERIAL_CORE_H
#define LINUX_SERIAL_CORE_H


#include <linux/compiler.h>
#include <linux/interrupt.h>
#include <linux/circ_buf.h>
#include <linux/spinlock.h>
#include <linux/sched.h>
#include <linux/tty.h>
#include <linux/mutex.h>
#include <linux/sysrq.h>
#include <linux/pps_kernel.h>
#include <uapi/linux/serial_core.h>

struct uart_port;
struct serial_struct;
struct device;

/*
 * This structure describes all the operations that can be
 * done on the physical hardware.
 */
struct uart_ops {
	unsigned int	(*tx_empty)(struct uart_port *);
	void		(*set_mctrl)(struct uart_port *, unsigned int mctrl);
	unsigned int	(*get_mctrl)(struct uart_port *);
	void		(*stop_tx)(struct uart_port *);
	void		(*start_tx)(struct uart_port *);
	void		(*throttle)(struct uart_port *);
	void		(*unthrottle)(struct uart_port *);
	void		(*send_xchar)(struct uart_port *, char ch);
	void		(*stop_rx)(struct uart_port *);
	void		(*enable_ms)(struct uart_port *);
	void		(*break_ctl)(struct uart_port *, int ctl);
	int		(*startup)(struct uart_port *);
	void		(*shutdown)(struct uart_port *);
	void		(*flush_buffer)(struct uart_port *);
	void		(*set_termios)(struct uart_port *, struct ktermios *new,
				       struct ktermios *old);
	void		(*set_ldisc)(struct uart_port *, int new);
	void		(*pm)(struct uart_port *, unsigned int state,
			      unsigned int oldstate);
	int		(*set_wake)(struct uart_port *, unsigned int state);

	/*
	 * Return a string describing the type of the port
	 */
	const char *(*type)(struct uart_port *);

	/*
	 * Release IO and memory resources used by the port.
	 * This includes iounmap if necessary.
	 */
	void		(*release_port)(struct uart_port *);

	/*
	 * Request IO and memory resources used by the port.
	 * This includes iomapping the port if necessary.
	 */
	int		(*request_port)(struct uart_port *);
	void		(*config_port)(struct uart_port *, int);
	int		(*verify_port)(struct uart_port *, struct serial_struct *);
	int		(*ioctl)(struct uart_port *, unsigned int, unsigned long);
#ifdef CONFIG_CONSOLE_POLL
	int		(*poll_init)(struct uart_port *);
	void	(*poll_put_char)(struct uart_port *, unsigned char);
	int		(*poll_get_char)(struct uart_port *);
#endif
};

#define NO_POLL_CHAR		0x00ff0000
#define UART_CONFIG_TYPE	(1 << 0)
#define UART_CONFIG_IRQ		(1 << 1)

struct uart_icount {
	__u32	cts;
	__u32	dsr;
	__u32	rng;
	__u32	dcd;
	__u32	rx;
	__u32	tx;
	__u32	frame;
	__u32	overrun;
	__u32	parity;
	__u32	brk;
	__u32	buf_overrun;
};

typedef unsigned int __bitwise__ upf_t;

struct uart_port {
	spinlock_t		lock;			/* port lock */
	unsigned long		iobase;			/* in/out[bwl] */
	unsigned char __iomem	*membase;		/* read/write[bwl] */
	unsigned int		(*serial_in)(struct uart_port *, int);
	void			(*serial_out)(struct uart_port *, int, int);
	void			(*set_termios)(struct uart_port *,
				               struct ktermios *new,
				               struct ktermios *old);
	int			(*handle_irq)(struct uart_port *);
	void			(*pm)(struct uart_port *, unsigned int state,
				      unsigned int old);
	void			(*handle_break)(struct uart_port *);
	unsigned int		irq;			/* irq number */
	unsigned long		irqflags;		/* irq flags  */
	unsigned int		uartclk;		/* base uart clock */
	unsigned int		fifosize;		/* tx fifo size */
	unsigned char		x_char;			/* xon/xoff char */
	unsigned char		regshift;		/* reg offset shift */
	unsigned char		iotype;			/* io access style */
	unsigned char		unused1;

#define UPIO_PORT		(0)
#define UPIO_HUB6		(1)
#define UPIO_MEM		(2)
#define UPIO_MEM32		(3)
#define UPIO_AU			(4)			/* Au1x00 type IO */
#define UPIO_TSI		(5)			/* Tsi108/109 type IO */
#define UPIO_RM9000		(6)			/* RM9000 type IO */

	unsigned int		read_status_mask;	/* driver specific */
	unsigned int		ignore_status_mask;	/* driver specific */
	struct uart_state	*state;			/* pointer to parent state */
	struct uart_icount	icount;			/* statistics */

	struct console		*cons;			/* struct console, if any */
#if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ)
	unsigned long		sysrq;			/* sysrq timeout */
#endif

	upf_t			flags;

#define UPF_FOURPORT		((__force upf_t) (1 << 1))
#define UPF_SAK			((__force upf_t) (1 << 2))
#define UPF_SPD_MASK		((__force upf_t) (0x1030))
#define UPF_SPD_HI		((__force upf_t) (0x0010))
#define UPF_SPD_VHI		((__force upf_t) (0x0020))
#define UPF_SPD_CUST		((__force upf_t) (0x0030))
#define UPF_SPD_SHI		((__force upf_t) (0x1000))
#define UPF_SPD_WARP		((__force upf_t) (0x1010))
#define UPF_SKIP_TEST		((__force upf_t) (1 << 6))
#define UPF_AUTO_IRQ		((__force upf_t) (1 << 7))
#define UPF_HARDPPS_CD		((__force upf_t) (1 << 11))
#define UPF_LOW_LATENCY		((__force upf_t) (1 << 13))
#define UPF_BUGGY_UART		((__force upf_t) (1 << 14))
#define UPF_NO_TXEN_TEST	((__force upf_t) (1 << 15))
#define UPF_MAGIC_MULTIPLIER	((__force upf_t) (1 << 16))
/* Port has hardware-assisted h/w flow control (iow, auto-RTS *not* auto-CTS) */
#define UPF_HARD_FLOW		((__force upf_t) (1 << 21))
/* Port has hardware-assisted s/w flow control */
#define UPF_SOFT_FLOW		((__force upf_t) (1 << 22))
#define UPF_CONS_FLOW		((__force upf_t) (1 << 23))
#define UPF_SHARE_IRQ		((__force upf_t) (1 << 24))
#define UPF_EXAR_EFR		((__force upf_t) (1 << 25))
#define UPF_BUG_THRE		((__force upf_t) (1 << 26))
/* The exact UART type is known and should not be probed.  */
#define UPF_FIXED_TYPE		((__force upf_t) (1 << 27))
#define UPF_BOOT_AUTOCONF	((__force upf_t) (1 << 28))
#define UPF_FIXED_PORT		((__force upf_t) (1 << 29))
#define UPF_DEAD		((__force upf_t) (1 << 30))
#define UPF_IOREMAP		((__force upf_t) (1 << 31))

#define UPF_CHANGE_MASK		((__force upf_t) (0x17fff))
#define UPF_USR_MASK		((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))

	unsigned int		mctrl;			/* current modem ctrl settings */
	unsigned int		timeout;		/* character-based timeout */
	unsigned int		type;			/* port type */
	const struct uart_ops	*ops;
	unsigned int		custom_divisor;
	unsigned int		line;			/* port index */
	resource_size_t		mapbase;		/* for ioremap */
	struct device		*dev;			/* parent device */
	unsigned char		hub6;			/* this should be in the 8250 driver */
	unsigned char		suspended;
	unsigned char		irq_wake;
	unsigned char		unused[2];
	void			*private_data;		/* generic platform data pointer */
};

static inline int serial_port_in(struct uart_port *up, int offset)
{
	return up->serial_in(up, offset);
}

static inline void serial_port_out(struct uart_port *up, int offset, int value)
{
	up->serial_out(up, offset, value);
}

/*
 * This is the state information which is persistent across opens.
 */
struct uart_state {
	struct tty_port		port;

	int			pm_state;
	struct circ_buf		xmit;

	struct uart_port	*uart_port;
};

#define UART_XMIT_SIZE	PAGE_SIZE


/* number of characters left in xmit buffer before we ask for more */
#define WAKEUP_CHARS		256

struct module;
struct tty_driver;

struct uart_driver {
	struct module		*owner;
	const char		*driver_name;
	const char		*dev_name;
	int			 major;
	int			 minor;
	int			 nr;
	struct console		*cons;

	/*
	 * these are private; the low level driver should not
	 * touch these; they should be initialised to NULL
	 */
	struct uart_state	*state;
	struct tty_driver	*tty_driver;
};

void uart_write_wakeup(struct uart_port *port);

/*
 * Baud rate helpers.
 */
void uart_update_timeout(struct uart_port *port, unsigned int cflag,
			 unsigned int baud);
unsigned int uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
				struct ktermios *old, unsigned int min,
				unsigned int max);
unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);

/* Base timer interval for polling */
static inline int uart_poll_timeout(struct uart_port *port)
{
	int timeout = port->timeout;

	return timeout > 6 ? (timeout / 2 - 2) : 1;
}

/*
 * Console helpers.
 */
struct uart_port *uart_get_console(struct uart_port *ports, int nr,
				   struct console *c);
void uart_parse_options(char *options, int *baud, int *parity, int *bits,
			int *flow);
int uart_set_options(struct uart_port *port, struct console *co, int baud,
		     int parity, int bits, int flow);
struct tty_driver *uart_console_device(struct console *co, int *index);
void uart_console_write(struct uart_port *port, const char *s,
			unsigned int count,
			void (*putchar)(struct uart_port *, int));

/*
 * Port/driver registration/removal
 */
int uart_register_driver(struct uart_driver *uart);
void uart_unregister_driver(struct uart_driver *uart);
int uart_add_one_port(struct uart_driver *reg, struct uart_port *port);
int uart_remove_one_port(struct uart_driver *reg, struct uart_port *port);
int uart_match_port(struct uart_port *port1, struct uart_port *port2);

/*
 * Power Management
 */
int uart_suspend_port(struct uart_driver *reg, struct uart_port *port);
int uart_resume_port(struct uart_driver *reg, struct uart_port *port);

#define uart_circ_empty(circ)		((circ)->head == (circ)->tail)
#define uart_circ_clear(circ)		((circ)->head = (circ)->tail = 0)

#define uart_circ_chars_pending(circ)	\
	(CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))

#define uart_circ_chars_free(circ)	\
	(CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))

static inline int uart_tx_stopped(struct uart_port *port)
{
	struct tty_struct *tty = port->state->port.tty;
	if(tty->stopped || tty->hw_stopped)
		return 1;
	return 0;
}

/*
 * The following are helper functions for the low level drivers.
 */

extern void uart_handle_dcd_change(struct uart_port *uport,
		unsigned int status);
extern void uart_handle_cts_change(struct uart_port *uport,
		unsigned int status);

extern void uart_insert_char(struct uart_port *port, unsigned int status,
		 unsigned int overrun, unsigned int ch, unsigned int flag);

#ifdef SUPPORT_SYSRQ
static inline int
uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
{
	if (port->sysrq) {
		if (ch && time_before(jiffies, port->sysrq)) {
			handle_sysrq(ch);
			port->sysrq = 0;
			return 1;
		}
		port->sysrq = 0;
	}
	return 0;
}
#else
#define uart_handle_sysrq_char(port,ch) ({ (void)port; 0; })
#endif

/*
 * We do the SysRQ and SAK checking like this...
 */
static inline int uart_handle_break(struct uart_port *port)
{
	struct uart_state *state = port->state;

	if (port->handle_break)
		port->handle_break(port);

#ifdef SUPPORT_SYSRQ
	if (port->cons && port->cons->index == port->line) {
		if (!port->sysrq) {
			port->sysrq = jiffies + HZ*5;
			return 1;
		}
		port->sysrq = 0;
	}
#endif
	if (port->flags & UPF_SAK)
		do_SAK(state->port.tty);
	return 0;
}

/*
 *	UART_ENABLE_MS - determine if port should enable modem status irqs
 */
#define UART_ENABLE_MS(port,cflag)	((port)->flags & UPF_HARDPPS_CD || \
					 (cflag) & CRTSCTS || \
					 !((cflag) & CLOCAL))

#endif /* LINUX_SERIAL_CORE_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/drivers/char/serial_core.h
	3	*
	4	* Copyright (C) 2000 Deep Blue Solutions Ltd.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*/
	20	#ifndef LINUX_SERIAL_CORE_H
	21	#define LINUX_SERIAL_CORE_H
	22
1da177e4	23
661f83a6	24	#include <linux/compiler.h>
1da177e4 LT	25	#include <linux/interrupt.h>
	26	#include <linux/circ_buf.h>
	27	#include <linux/spinlock.h>
	28	#include <linux/sched.h>
	29	#include <linux/tty.h>
e2862f6a	30	#include <linux/mutex.h>
b11115c1	31	#include <linux/sysrq.h>
6f4229b5	32	#include <linux/pps_kernel.h>
607ca46e	33	#include <uapi/linux/serial_core.h>
1da177e4 LT	34
1da177e4 LT	35	struct uart_port;
1da177e4 LT	36	struct serial_struct;
	37	struct device;
	38
	39	/*
	40	* This structure describes all the operations that can be
	41	* done on the physical hardware.
	42	*/
	43	struct uart_ops {
	44	unsigned int (tx_empty)(struct uart_port );
	45	void (set_mctrl)(struct uart_port , unsigned int mctrl);
	46	unsigned int (get_mctrl)(struct uart_port );
b129a8cc RK	47	void (stop_tx)(struct uart_port );
b129a8cc RK	48	void (start_tx)(struct uart_port );
9aba8d5b RK	49	void (throttle)(struct uart_port );
9aba8d5b RK	50	void (unthrottle)(struct uart_port );
1da177e4 LT	51	void (send_xchar)(struct uart_port , char ch);
	52	void (stop_rx)(struct uart_port );
	53	void (enable_ms)(struct uart_port );
	54	void (break_ctl)(struct uart_port , int ctl);
	55	int (startup)(struct uart_port );
	56	void (shutdown)(struct uart_port );
6bb0e3a5	57	void (flush_buffer)(struct uart_port );
606d099c AC	58	void (set_termios)(struct uart_port , struct ktermios *new,
606d099c AC	59	struct ktermios *old);
d87d9b7d	60	void (set_ldisc)(struct uart_port , int new);
1da177e4 LT	61	void (pm)(struct uart_port , unsigned int state,
	62	unsigned int oldstate);
	63	int (set_wake)(struct uart_port , unsigned int state);
	64
	65	/*
	66	* Return a string describing the type of the port
	67	*/
	68	const char (type)(struct uart_port *);
	69
	70	/*
	71	* Release IO and memory resources used by the port.
	72	* This includes iounmap if necessary.
	73	*/
	74	void (release_port)(struct uart_port );
	75
	76	/*
	77	* Request IO and memory resources used by the port.
	78	* This includes iomapping the port if necessary.
	79	*/
	80	int (request_port)(struct uart_port );
	81	void (config_port)(struct uart_port , int);
	82	int (verify_port)(struct uart_port , struct serial_struct *);
	83	int (ioctl)(struct uart_port , unsigned int, unsigned long);
f2d937f3	84	#ifdef CONFIG_CONSOLE_POLL
c7f3e708	85	int (poll_init)(struct uart_port );
f2d937f3 JW	86	void (poll_put_char)(struct uart_port , unsigned char);
	87	int (poll_get_char)(struct uart_port );
	88	#endif
1da177e4 LT	89	};
1da177e4 LT	90
f5316b4a	91	#define NO_POLL_CHAR 0x00ff0000
1da177e4 LT	92	#define UART_CONFIG_TYPE (1 << 0)
	93	#define UART_CONFIG_IRQ (1 << 1)
	94
	95	struct uart_icount {
	96	__u32 cts;
	97	__u32 dsr;
	98	__u32 rng;
	99	__u32 dcd;
	100	__u32 rx;
	101	__u32 tx;
	102	__u32 frame;
	103	__u32 overrun;
	104	__u32 parity;
	105	__u32 brk;
	106	__u32 buf_overrun;
	107	};
	108
0077d45e RK	109	typedef unsigned int __bitwise__ upf_t;
0077d45e RK	110
1da177e4 LT	111	struct uart_port {
1da177e4 LT	112	spinlock_t lock; /* port lock */
0c8946d9	113	unsigned long iobase; /* in/out[bwl] */
1da177e4	114	unsigned char __iomem membase; / read/write[bwl] */
7d6a07d1 DD	115	unsigned int (serial_in)(struct uart_port , int);
7d6a07d1 DD	116	void (serial_out)(struct uart_port , int, int);
235dae5d PL	117	void (set_termios)(struct uart_port ,
	118	struct ktermios *new,
	119	struct ktermios *old);
a74036f5	120	int (handle_irq)(struct uart_port );
c161afe9 ML	121	void (pm)(struct uart_port , unsigned int state,
c161afe9 ML	122	unsigned int old);
bf03f65b	123	void (handle_break)(struct uart_port );
1da177e4	124	unsigned int irq; /* irq number */
1c2f0493	125	unsigned long irqflags; /* irq flags */
1da177e4	126	unsigned int uartclk; /* base uart clock */
947deee8	127	unsigned int fifosize; /* tx fifo size */
1da177e4 LT	128	unsigned char x_char; /* xon/xoff char */
	129	unsigned char regshift; /* reg offset shift */
	130	unsigned char iotype; /* io access style */
947deee8	131	unsigned char unused1;
1da177e4 LT	132
	133	#define UPIO_PORT (0)
	134	#define UPIO_HUB6 (1)
	135	#define UPIO_MEM (2)
	136	#define UPIO_MEM32 (3)
21c614a7	137	#define UPIO_AU (4) /* Au1x00 type IO */
3be91ec7	138	#define UPIO_TSI (5) /* Tsi108/109 type IO */
4834d028	139	#define UPIO_RM9000 (6) /* RM9000 type IO */
1da177e4 LT	140
	141	unsigned int read_status_mask; /* driver specific */
	142	unsigned int ignore_status_mask; /* driver specific */
ebd2c8f6	143	struct uart_state state; / pointer to parent state */
1da177e4 LT	144	struct uart_icount icount; /* statistics */
	145
	146	struct console cons; / struct console, if any */
06e82df0	147	#if defined(CONFIG_SERIAL_CORE_CONSOLE) \|\| defined(SUPPORT_SYSRQ)
1da177e4 LT	148	unsigned long sysrq; /* sysrq timeout */
	149	#endif
	150
0077d45e RK	151	upf_t flags;
	152
	153	#define UPF_FOURPORT ((__force upf_t) (1 << 1))
	154	#define UPF_SAK ((__force upf_t) (1 << 2))
	155	#define UPF_SPD_MASK ((__force upf_t) (0x1030))
	156	#define UPF_SPD_HI ((__force upf_t) (0x0010))
	157	#define UPF_SPD_VHI ((__force upf_t) (0x0020))
	158	#define UPF_SPD_CUST ((__force upf_t) (0x0030))
	159	#define UPF_SPD_SHI ((__force upf_t) (0x1000))
	160	#define UPF_SPD_WARP ((__force upf_t) (0x1010))
	161	#define UPF_SKIP_TEST ((__force upf_t) (1 << 6))
	162	#define UPF_AUTO_IRQ ((__force upf_t) (1 << 7))
	163	#define UPF_HARDPPS_CD ((__force upf_t) (1 << 11))
	164	#define UPF_LOW_LATENCY ((__force upf_t) (1 << 13))
	165	#define UPF_BUGGY_UART ((__force upf_t) (1 << 14))
b6adea33	166	#define UPF_NO_TXEN_TEST ((__force upf_t) (1 << 15))
0077d45e	167	#define UPF_MAGIC_MULTIPLIER ((__force upf_t) (1 << 16))
dba05832 RK	168	/* Port has hardware-assisted h/w flow control (iow, auto-RTS not auto-CTS) */
dba05832 RK	169	#define UPF_HARD_FLOW ((__force upf_t) (1 << 21))
2cbacafd RK	170	/* Port has hardware-assisted s/w flow control */
2cbacafd RK	171	#define UPF_SOFT_FLOW ((__force upf_t) (1 << 22))
0077d45e RK	172	#define UPF_CONS_FLOW ((__force upf_t) (1 << 23))
0077d45e RK	173	#define UPF_SHARE_IRQ ((__force upf_t) (1 << 24))
06315348	174	#define UPF_EXAR_EFR ((__force upf_t) (1 << 25))
bc02d15a	175	#define UPF_BUG_THRE ((__force upf_t) (1 << 26))
8e23fcc8 DD	176	/* The exact UART type is known and should not be probed. */
8e23fcc8 DD	177	#define UPF_FIXED_TYPE ((__force upf_t) (1 << 27))
0077d45e	178	#define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28))
abb4a239	179	#define UPF_FIXED_PORT ((__force upf_t) (1 << 29))
68ac64cd	180	#define UPF_DEAD ((__force upf_t) (1 << 30))
0077d45e RK	181	#define UPF_IOREMAP ((__force upf_t) (1 << 31))
	182
	183	#define UPF_CHANGE_MASK ((__force upf_t) (0x17fff))
	184	#define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK\|UPF_LOW_LATENCY))
1da177e4 LT	185
	186	unsigned int mctrl; /* current modem ctrl settings */
	187	unsigned int timeout; /* character-based timeout */
	188	unsigned int type; /* port type */
ba899dbc	189	const struct uart_ops *ops;
1da177e4 LT	190	unsigned int custom_divisor;
1da177e4 LT	191	unsigned int line; /* port index */
4f640efb	192	resource_size_t mapbase; /* for ioremap */
1da177e4 LT	193	struct device dev; / parent device */
1da177e4 LT	194	unsigned char hub6; /* this should be in the 8250 driver */
b3b708fa	195	unsigned char suspended;
3f960dbb	196	unsigned char irq_wake;
b3b708fa	197	unsigned char unused[2];
beab697a	198	void private_data; / generic platform data pointer */
1da177e4 LT	199	};
1da177e4 LT	200
927353a7 PG	201	static inline int serial_port_in(struct uart_port *up, int offset)
	202	{
	203	return up->serial_in(up, offset);
	204	}
	205
	206	static inline void serial_port_out(struct uart_port *up, int offset, int value)
	207	{
	208	up->serial_out(up, offset, value);
	209	}
	210
ebd2c8f6 AC	211	/*
ebd2c8f6 AC	212	* This is the state information which is persistent across opens.
ebd2c8f6 AC	213	*/
ebd2c8f6 AC	214	struct uart_state {
df4f4dd4	215	struct tty_port port;
ebd2c8f6	216
ebd2c8f6	217	int pm_state;
1da177e4	218	struct circ_buf xmit;
1da177e4	219
ebd2c8f6	220	struct uart_port *uart_port;
f751928e AC	221	};
	222
	223	#define UART_XMIT_SIZE PAGE_SIZE
	224
	225
1da177e4 LT	226	/* number of characters left in xmit buffer before we ask for more */
	227	#define WAKEUP_CHARS 256
	228
	229	struct module;
	230	struct tty_driver;
	231
	232	struct uart_driver {
	233	struct module *owner;
	234	const char *driver_name;
	235	const char *dev_name;
1da177e4 LT	236	int major;
	237	int minor;
	238	int nr;
	239	struct console *cons;
	240
	241	/*
	242	* these are private; the low level driver should not
	243	* touch these; they should be initialised to NULL
	244	*/
	245	struct uart_state *state;
	246	struct tty_driver *tty_driver;
	247	};
	248
	249	void uart_write_wakeup(struct uart_port *port);
	250
	251	/*
	252	* Baud rate helpers.
	253	*/
	254	void uart_update_timeout(struct uart_port *port, unsigned int cflag,
	255	unsigned int baud);
606d099c AC	256	unsigned int uart_get_baud_rate(struct uart_port port, struct ktermios termios,
606d099c AC	257	struct ktermios *old, unsigned int min,
1da177e4 LT	258	unsigned int max);
	259	unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
	260
54381067 AV	261	/* Base timer interval for polling */
	262	static inline int uart_poll_timeout(struct uart_port *port)
	263	{
	264	int timeout = port->timeout;
	265
	266	return timeout > 6 ? (timeout / 2 - 2) : 1;
	267	}
	268
1da177e4 LT	269	/*
	270	* Console helpers.
	271	*/
	272	struct uart_port uart_get_console(struct uart_port ports, int nr,
	273	struct console *c);
	274	void uart_parse_options(char options, int baud, int parity, int bits,
	275	int *flow);
	276	int uart_set_options(struct uart_port port, struct console co, int baud,
	277	int parity, int bits, int flow);
	278	struct tty_driver uart_console_device(struct console co, int *index);
d358788f RK	279	void uart_console_write(struct uart_port port, const char s,
	280	unsigned int count,
	281	void (putchar)(struct uart_port , int));
1da177e4 LT	282
	283	/*
	284	* Port/driver registration/removal
	285	*/
	286	int uart_register_driver(struct uart_driver *uart);
	287	void uart_unregister_driver(struct uart_driver *uart);
1da177e4 LT	288	int uart_add_one_port(struct uart_driver reg, struct uart_port port);
	289	int uart_remove_one_port(struct uart_driver reg, struct uart_port port);
	290	int uart_match_port(struct uart_port port1, struct uart_port port2);
	291
	292	/*
	293	* Power Management
	294	*/
	295	int uart_suspend_port(struct uart_driver reg, struct uart_port port);
	296	int uart_resume_port(struct uart_driver reg, struct uart_port port);
	297
	298	#define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
	299	#define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
	300
	301	#define uart_circ_chars_pending(circ) \
	302	(CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
	303
	304	#define uart_circ_chars_free(circ) \
	305	(CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
	306
f751928e AC	307	static inline int uart_tx_stopped(struct uart_port *port)
f751928e AC	308	{
ebd2c8f6	309	struct tty_struct *tty = port->state->port.tty;
f751928e AC	310	if(tty->stopped \|\| tty->hw_stopped)
	311	return 1;
	312	return 0;
	313	}
1da177e4 LT	314
	315	/*
	316	* The following are helper functions for the low level drivers.
	317	*/
027d7dac JS	318
	319	extern void uart_handle_dcd_change(struct uart_port *uport,
	320	unsigned int status);
	321	extern void uart_handle_cts_change(struct uart_port *uport,
	322	unsigned int status);
	323
	324	extern void uart_insert_char(struct uart_port *port, unsigned int status,
	325	unsigned int overrun, unsigned int ch, unsigned int flag);
	326
	327	#ifdef SUPPORT_SYSRQ
1da177e4	328	static inline int
7d12e780	329	uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
1da177e4 LT	330	{
	331	if (port->sysrq) {
	332	if (ch && time_before(jiffies, port->sysrq)) {
f335397d	333	handle_sysrq(ch);
1da177e4 LT	334	port->sysrq = 0;
	335	return 1;
	336	}
	337	port->sysrq = 0;
	338	}
	339	return 0;
	340	}
027d7dac JS	341	#else
027d7dac JS	342	#define uart_handle_sysrq_char(port,ch) ({ (void)port; 0; })
4e149184	343	#endif
1da177e4 LT	344
	345	/*
	346	* We do the SysRQ and SAK checking like this...
	347	*/
	348	static inline int uart_handle_break(struct uart_port *port)
	349	{
ebd2c8f6	350	struct uart_state *state = port->state;
bf03f65b DW	351
	352	if (port->handle_break)
	353	port->handle_break(port);
	354
1da177e4 LT	355	#ifdef SUPPORT_SYSRQ
	356	if (port->cons && port->cons->index == port->line) {
	357	if (!port->sysrq) {
	358	port->sysrq = jiffies + HZ*5;
	359	return 1;
	360	}
	361	port->sysrq = 0;
	362	}
	363	#endif
27ae7a74	364	if (port->flags & UPF_SAK)
ebd2c8f6	365	do_SAK(state->port.tty);
1da177e4 LT	366	return 0;
	367	}
	368
1da177e4 LT	369	/*
	370	* UART_ENABLE_MS - determine if port should enable modem status irqs
	371	*/
	372	#define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD \|\| \
	373	(cflag) & CRTSCTS \|\| \
	374	!((cflag) & CLOCAL))
	375
1da177e4	376	#endif /* LINUX_SERIAL_CORE_H */