include/linux/serial_core.h - kernel/msm-4.19 - Gitiles

 /*
  *  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

 /*
  * The type definitions.  These are from Ted Ts'o's serial.h
  */
 #define PORT_UNKNOWN	0
 #define PORT_8250	1
 #define PORT_16450	2
 #define PORT_16550	3
 #define PORT_16550A	4
 #define PORT_CIRRUS	5
 #define PORT_16650	6
 #define PORT_16650V2	7
 #define PORT_16750	8
 #define PORT_STARTECH	9
 #define PORT_16C950	10
 #define PORT_16654	11
 #define PORT_16850	12
 #define PORT_RSA	13
 #define PORT_NS16550A	14
 #define PORT_XSCALE	15
 #define PORT_MAX_8250	15	/* max port ID */

 /*
  * ARM specific type numbers.  These are not currently guaranteed
  * to be implemented, and will change in the future.  These are
  * separate so any additions to the old serial.c that occur before
  * we are merged can be easily merged here.
  */
 #define PORT_PXA	31
 #define PORT_AMBA	32
 #define PORT_CLPS711X	33
 #define PORT_SA1100	34
 #define PORT_UART00	35
 #define PORT_21285	37

 /* Sparc type numbers.  */
 #define PORT_SUNZILOG	38
 #define PORT_SUNSAB	39

 /* NEC v850.  */
 #define PORT_V850E_UART	40

 /* DZ */
 #define PORT_DZ		47

 /* Parisc type numbers. */
 #define PORT_MUX	48

 /* Macintosh Zilog type numbers */
 #define PORT_MAC_ZILOG	50	/* m68k : not yet implemented */
 #define PORT_PMAC_ZILOG	51

 /* SH-SCI */
 #define PORT_SCI	52
 #define PORT_SCIF	53
 #define PORT_IRDA	54

 /* Samsung S3C2410 SoC and derivatives thereof */
 #define PORT_S3C2410    55

 /* SGI IP22 aka Indy / Challenge S / Indigo 2 */
 #define PORT_IP22ZILOG	56

 /* Sharp LH7a40x -- an ARM9 SoC series */
 #define PORT_LH7A40X	57

 /* PPC CPM type number */
 #define PORT_CPM        58

 /* MPC52xx type numbers */
 #define PORT_MPC52xx	59

 /* IBM icom */
 #define PORT_ICOM	60

 /* Samsung S3C2440 SoC */
 #define PORT_S3C2440	61

 /* Motorola i.MX SoC */
 #define PORT_IMX	62

 /* Marvell MPSC */
 #define PORT_MPSC	63

 /* TXX9 type number */
 #define PORT_TXX9	64

 /* NEC VR4100 series SIU/DSIU */
 #define PORT_VR41XX_SIU		65
 #define PORT_VR41XX_DSIU	66

 /* Samsung S3C2400 SoC */
 #define PORT_S3C2400	67

 /* M32R SIO */
 #define PORT_M32R_SIO	68

 /*Digi jsm */
 #define PORT_JSM        65

 #ifdef __KERNEL__

 #include <linux/config.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>

 struct uart_port;
 struct uart_info;
 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		(*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		(*set_termios)(struct uart_port *, struct termios *new,
 				       struct termios *old);
 	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);
 };

 #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;
 };

 struct uart_port {
 	spinlock_t		lock;			/* port lock */
 	unsigned int		iobase;			/* in/out[bwl] */
 	unsigned char __iomem	*membase;		/* read/write[bwl] */
 	unsigned int		irq;			/* irq number */
 	unsigned int		uartclk;		/* base uart clock */
 	unsigned char		fifosize;		/* tx fifo size */
 	unsigned char		x_char;			/* xon/xoff char */
 	unsigned char		regshift;		/* reg offset shift */
 	unsigned char		iotype;			/* io access style */

 #define UPIO_PORT		(0)
 #define UPIO_HUB6		(1)
 #define UPIO_MEM		(2)
 #define UPIO_MEM32		(3)

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

 	struct console		*cons;			/* struct console, if any */
 #ifdef CONFIG_SERIAL_CORE_CONSOLE
 	unsigned long		sysrq;			/* sysrq timeout */
 #endif

 	unsigned int		flags;

 #define UPF_FOURPORT		(1 << 1)
 #define UPF_SAK			(1 << 2)
 #define UPF_SPD_MASK		(0x1030)
 #define UPF_SPD_HI		(0x0010)
 #define UPF_SPD_VHI		(0x0020)
 #define UPF_SPD_CUST		(0x0030)
 #define UPF_SPD_SHI		(0x1000)
 #define UPF_SPD_WARP		(0x1010)
 #define UPF_SKIP_TEST		(1 << 6)
 #define UPF_AUTO_IRQ		(1 << 7)
 #define UPF_HARDPPS_CD		(1 << 11)
 #define UPF_LOW_LATENCY		(1 << 13)
 #define UPF_BUGGY_UART		(1 << 14)
 #define UPF_AUTOPROBE		(1 << 15)
 #define UPF_MAGIC_MULTIPLIER	(1 << 16)
 #define UPF_BOOT_ONLYMCA	(1 << 22)
 #define UPF_CONS_FLOW		(1 << 23)
 #define UPF_SHARE_IRQ		(1 << 24)
 #define UPF_BOOT_AUTOCONF	(1 << 28)
 #define UPF_IOREMAP		(1 << 31)

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

 	unsigned int		mctrl;			/* current modem ctrl settings */
 	unsigned int		timeout;		/* character-based timeout */
 	unsigned int		type;			/* port type */
 	struct uart_ops		*ops;
 	unsigned int		custom_divisor;
 	unsigned int		line;			/* port index */
 	unsigned long		mapbase;		/* for ioremap */
 	struct device		*dev;			/* parent device */
 	unsigned char		hub6;			/* this should be in the 8250 driver */
 	unsigned char		unused[3];
 };

 /*
  * This is the state information which is persistent across opens.
  * The low level driver must not to touch any elements contained
  * within.
  */
 struct uart_state {
 	unsigned int		close_delay;		/* msec */
 	unsigned int		closing_wait;		/* msec */

 #define USF_CLOSING_WAIT_INF	(0)
 #define USF_CLOSING_WAIT_NONE	(~0U)

 	int			count;
 	int			pm_state;
 	struct uart_info	*info;
 	struct uart_port	*port;

 	struct semaphore	sem;
 };

 #define UART_XMIT_SIZE	PAGE_SIZE
 /*
  * This is the state information which is only valid when the port
  * is open; it may be freed by the core driver once the device has
  * been closed.  Either the low level driver or the core can modify
  * stuff here.
  */
 struct uart_info {
 	struct tty_struct	*tty;
 	struct circ_buf		xmit;
 	unsigned int		flags;

 /*
  * These are the flags that specific to info->flags, and reflect our
  * internal state.  They can not be accessed via port->flags.  Low
  * level drivers must not change these, but may query them instead.
  */
 #define UIF_CHECK_CD		(1 << 25)
 #define UIF_CTS_FLOW		(1 << 26)
 #define UIF_NORMAL_ACTIVE	(1 << 29)
 #define UIF_INITIALIZED		(1 << 31)

 	int			blocked_open;

 	struct tasklet_struct	tlet;

 	wait_queue_head_t	open_wait;
 	wait_queue_head_t	delta_msr_wait;
 };

 /* 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;
 	const char		*devfs_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 termios *termios,
 				struct termios *old, unsigned int min,
 				unsigned int max);
 unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);

 /*
  * 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);

 /*
  * 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))

 #define uart_tx_stopped(port)		\
 	((port)->info->tty->stopped || (port)->info->tty->hw_stopped)

 /*
  * The following are helper functions for the low level drivers.
  */
 #ifdef SUPPORT_SYSRQ
 static inline int
 uart_handle_sysrq_char(struct uart_port *port, unsigned int ch,
 		       struct pt_regs *regs)
 {
 	if (port->sysrq) {
 		if (ch && time_before(jiffies, port->sysrq)) {
 			handle_sysrq(ch, regs, NULL);
 			port->sysrq = 0;
 			return 1;
 		}
 		port->sysrq = 0;
 	}
 	return 0;
 }
 #else
 #define uart_handle_sysrq_char(port,ch,regs)	(0)
 #endif

 /*
  * We do the SysRQ and SAK checking like this...
  */
 static inline int uart_handle_break(struct uart_port *port)
 {
 	struct uart_info *info = port->info;
 #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 (info->flags & UPF_SAK)
 		do_SAK(info->tty);
 	return 0;
 }

 /**
  *	uart_handle_dcd_change - handle a change of carrier detect state
  *	@port: uart_port structure for the open port
  *	@status: new carrier detect status, nonzero if active
  */
 static inline void
 uart_handle_dcd_change(struct uart_port *port, unsigned int status)
 {
 	struct uart_info *info = port->info;

 	port->icount.dcd++;

 #ifdef CONFIG_HARD_PPS
 	if ((port->flags & UPF_HARDPPS_CD) && status)
 		hardpps();
 #endif

 	if (info->flags & UIF_CHECK_CD) {
 		if (status)
 			wake_up_interruptible(&info->open_wait);
 		else if (info->tty)
 			tty_hangup(info->tty);
 	}
 }

 /**
  *	uart_handle_cts_change - handle a change of clear-to-send state
  *	@port: uart_port structure for the open port
  *	@status: new clear to send status, nonzero if active
  */
 static inline void
 uart_handle_cts_change(struct uart_port *port, unsigned int status)
 {
 	struct uart_info *info = port->info;
 	struct tty_struct *tty = info->tty;

 	port->icount.cts++;

 	if (info->flags & UIF_CTS_FLOW) {
 		if (tty->hw_stopped) {
 			if (status) {
 				tty->hw_stopped = 0;
 				port->ops->start_tx(port);
 				uart_write_wakeup(port);
 			}
 		} else {
 			if (!status) {
 				tty->hw_stopped = 1;
 				port->ops->stop_tx(port);
 			}
 		}
 	}
 }

 #include <linux/tty_flip.h>

 static inline void
 uart_insert_char(struct uart_port *port, unsigned int status,
 		 unsigned int overrun, unsigned int ch, unsigned int flag)
 {
 	struct tty_struct *tty = port->info->tty;

 	if ((status & port->ignore_status_mask & ~overrun) == 0)
 		tty_insert_flip_char(tty, ch, flag);

 	/*
 	 * Overrun is special.  Since it's reported immediately,
 	 * it doesn't affect the current character.
 	 */
 	if (status & ~port->ignore_status_mask & overrun)
 		tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 }

 /*
  *	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

 #endif /* 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

	/*
	* The type definitions. These are from Ted Ts'o's serial.h
	*/
	#define PORT_UNKNOWN 0
	#define PORT_8250 1
	#define PORT_16450 2
	#define PORT_16550 3
	#define PORT_16550A 4
	#define PORT_CIRRUS 5
	#define PORT_16650 6
	#define PORT_16650V2 7
	#define PORT_16750 8
	#define PORT_STARTECH 9
	#define PORT_16C950 10
	#define PORT_16654 11
	#define PORT_16850 12
	#define PORT_RSA 13
	#define PORT_NS16550A 14
	#define PORT_XSCALE 15
	#define PORT_MAX_8250 15 /* max port ID */

	/*
	* ARM specific type numbers. These are not currently guaranteed
	* to be implemented, and will change in the future. These are
	* separate so any additions to the old serial.c that occur before
	* we are merged can be easily merged here.
	*/
	#define PORT_PXA 31
	#define PORT_AMBA 32
	#define PORT_CLPS711X 33
	#define PORT_SA1100 34
	#define PORT_UART00 35
	#define PORT_21285 37

	/* Sparc type numbers. */
	#define PORT_SUNZILOG 38
	#define PORT_SUNSAB 39

	/* NEC v850. */
	#define PORT_V850E_UART 40

	/* DZ */
	#define PORT_DZ 47

	/* Parisc type numbers. */
	#define PORT_MUX 48

	/* Macintosh Zilog type numbers */
	#define PORT_MAC_ZILOG 50 /* m68k : not yet implemented */
	#define PORT_PMAC_ZILOG 51

	/* SH-SCI */
	#define PORT_SCI 52
	#define PORT_SCIF 53
	#define PORT_IRDA 54

	/* Samsung S3C2410 SoC and derivatives thereof */
	#define PORT_S3C2410 55

	/* SGI IP22 aka Indy / Challenge S / Indigo 2 */
	#define PORT_IP22ZILOG 56

	/* Sharp LH7a40x -- an ARM9 SoC series */
	#define PORT_LH7A40X 57

	/* PPC CPM type number */
	#define PORT_CPM 58

	/* MPC52xx type numbers */
	#define PORT_MPC52xx 59

	/* IBM icom */
	#define PORT_ICOM 60

	/* Samsung S3C2440 SoC */
	#define PORT_S3C2440 61

	/* Motorola i.MX SoC */
	#define PORT_IMX 62

	/* Marvell MPSC */
	#define PORT_MPSC 63

	/* TXX9 type number */
	#define PORT_TXX9 64

	/* NEC VR4100 series SIU/DSIU */
	#define PORT_VR41XX_SIU 65
	#define PORT_VR41XX_DSIU 66

	/* Samsung S3C2400 SoC */
	#define PORT_S3C2400 67

	/* M32R SIO */
	#define PORT_M32R_SIO 68

	/Digi jsm /
	#define PORT_JSM 65

	#ifdef __KERNEL__

	#include <linux/config.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>

	struct uart_port;
	struct uart_info;
	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 (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 (set_termios)(struct uart_port , struct termios *new,
	struct termios *old);
	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);
	};

	#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;
	};

	struct uart_port {
	spinlock_t lock; /* port lock */
	unsigned int iobase; /* in/out[bwl] */
	unsigned char __iomem membase; / read/write[bwl] */
	unsigned int irq; /* irq number */
	unsigned int uartclk; /* base uart clock */
	unsigned char fifosize; /* tx fifo size */
	unsigned char x_char; /* xon/xoff char */
	unsigned char regshift; /* reg offset shift */
	unsigned char iotype; /* io access style */

	#define UPIO_PORT (0)
	#define UPIO_HUB6 (1)
	#define UPIO_MEM (2)
	#define UPIO_MEM32 (3)

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

	struct console cons; / struct console, if any */
	#ifdef CONFIG_SERIAL_CORE_CONSOLE
	unsigned long sysrq; /* sysrq timeout */
	#endif

	unsigned int flags;

	#define UPF_FOURPORT (1 << 1)
	#define UPF_SAK (1 << 2)
	#define UPF_SPD_MASK (0x1030)
	#define UPF_SPD_HI (0x0010)
	#define UPF_SPD_VHI (0x0020)
	#define UPF_SPD_CUST (0x0030)
	#define UPF_SPD_SHI (0x1000)
	#define UPF_SPD_WARP (0x1010)
	#define UPF_SKIP_TEST (1 << 6)
	#define UPF_AUTO_IRQ (1 << 7)
	#define UPF_HARDPPS_CD (1 << 11)
	#define UPF_LOW_LATENCY (1 << 13)
	#define UPF_BUGGY_UART (1 << 14)
	#define UPF_AUTOPROBE (1 << 15)
	#define UPF_MAGIC_MULTIPLIER (1 << 16)
	#define UPF_BOOT_ONLYMCA (1 << 22)
	#define UPF_CONS_FLOW (1 << 23)
	#define UPF_SHARE_IRQ (1 << 24)
	#define UPF_BOOT_AUTOCONF (1 << 28)
	#define UPF_IOREMAP (1 << 31)

	#define UPF_CHANGE_MASK (0x17fff)
	#define UPF_USR_MASK (UPF_SPD_MASK\|UPF_LOW_LATENCY)

	unsigned int mctrl; /* current modem ctrl settings */
	unsigned int timeout; /* character-based timeout */
	unsigned int type; /* port type */
	struct uart_ops *ops;
	unsigned int custom_divisor;
	unsigned int line; /* port index */
	unsigned long mapbase; /* for ioremap */
	struct device dev; / parent device */
	unsigned char hub6; /* this should be in the 8250 driver */
	unsigned char unused[3];
	};

	/*
	* This is the state information which is persistent across opens.
	* The low level driver must not to touch any elements contained
	* within.
	*/
	struct uart_state {
	unsigned int close_delay; /* msec */
	unsigned int closing_wait; /* msec */

	#define USF_CLOSING_WAIT_INF (0)
	#define USF_CLOSING_WAIT_NONE (~0U)

	int count;
	int pm_state;
	struct uart_info *info;
	struct uart_port *port;

	struct semaphore sem;
	};

	#define UART_XMIT_SIZE PAGE_SIZE
	/*
	* This is the state information which is only valid when the port
	* is open; it may be freed by the core driver once the device has
	* been closed. Either the low level driver or the core can modify
	* stuff here.
	*/
	struct uart_info {
	struct tty_struct *tty;
	struct circ_buf xmit;
	unsigned int flags;

	/*
	* These are the flags that specific to info->flags, and reflect our
	* internal state. They can not be accessed via port->flags. Low
	* level drivers must not change these, but may query them instead.
	*/
	#define UIF_CHECK_CD (1 << 25)
	#define UIF_CTS_FLOW (1 << 26)
	#define UIF_NORMAL_ACTIVE (1 << 29)
	#define UIF_INITIALIZED (1 << 31)

	int blocked_open;

	struct tasklet_struct tlet;

	wait_queue_head_t open_wait;
	wait_queue_head_t delta_msr_wait;
	};

	/* 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;
	const char *devfs_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 termios termios,
	struct termios *old, unsigned int min,
	unsigned int max);
	unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);

	/*
	* 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);

	/*
	* 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))

	#define uart_tx_stopped(port) \
	((port)->info->tty->stopped \|\| (port)->info->tty->hw_stopped)

	/*
	* The following are helper functions for the low level drivers.
	*/
	#ifdef SUPPORT_SYSRQ
	static inline int
	uart_handle_sysrq_char(struct uart_port *port, unsigned int ch,
	struct pt_regs *regs)
	{
	if (port->sysrq) {
	if (ch && time_before(jiffies, port->sysrq)) {
	handle_sysrq(ch, regs, NULL);
	port->sysrq = 0;
	return 1;
	}
	port->sysrq = 0;
	}
	return 0;
	}
	#else
	#define uart_handle_sysrq_char(port,ch,regs) (0)
	#endif

	/*
	* We do the SysRQ and SAK checking like this...
	*/
	static inline int uart_handle_break(struct uart_port *port)
	{
	struct uart_info *info = port->info;
	#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 (info->flags & UPF_SAK)
	do_SAK(info->tty);
	return 0;
	}

	/**
	* uart_handle_dcd_change - handle a change of carrier detect state
	* @port: uart_port structure for the open port
	* @status: new carrier detect status, nonzero if active
	*/
	static inline void
	uart_handle_dcd_change(struct uart_port *port, unsigned int status)
	{
	struct uart_info *info = port->info;

	port->icount.dcd++;

	#ifdef CONFIG_HARD_PPS
	if ((port->flags & UPF_HARDPPS_CD) && status)
	hardpps();
	#endif

	if (info->flags & UIF_CHECK_CD) {
	if (status)
	wake_up_interruptible(&info->open_wait);
	else if (info->tty)
	tty_hangup(info->tty);
	}
	}

	/**
	* uart_handle_cts_change - handle a change of clear-to-send state
	* @port: uart_port structure for the open port
	* @status: new clear to send status, nonzero if active
	*/
	static inline void
	uart_handle_cts_change(struct uart_port *port, unsigned int status)
	{
	struct uart_info *info = port->info;
	struct tty_struct *tty = info->tty;

	port->icount.cts++;

	if (info->flags & UIF_CTS_FLOW) {
	if (tty->hw_stopped) {
	if (status) {
	tty->hw_stopped = 0;
	port->ops->start_tx(port);
	uart_write_wakeup(port);
	}
	} else {
	if (!status) {
	tty->hw_stopped = 1;
	port->ops->stop_tx(port);
	}
	}
	}
	}

	#include <linux/tty_flip.h>

	static inline void
	uart_insert_char(struct uart_port *port, unsigned int status,
	unsigned int overrun, unsigned int ch, unsigned int flag)
	{
	struct tty_struct *tty = port->info->tty;

	if ((status & port->ignore_status_mask & ~overrun) == 0)
	tty_insert_flip_char(tty, ch, flag);

	/*
	* Overrun is special. Since it's reported immediately,
	* it doesn't affect the current character.
	*/
	if (status & ~port->ignore_status_mask & overrun)
	tty_insert_flip_char(tty, 0, TTY_OVERRUN);
	}

	/*
	* 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

	#endif /* LINUX_SERIAL_CORE_H */