[GitHub/mt8127/android_kernel_alcatel_ttab.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

/*
 * 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 *, unsigned int tty_stop);
	void		(*start_tx)(struct uart_port *, unsigned int tty_start);
	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);
void __deprecated uart_unregister_port(struct uart_driver *reg, int line);
int __deprecated uart_register_port(struct uart_driver *reg, struct uart_port *port);
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, 0);
				uart_write_wakeup(port);
			}
		} else {
			if (!status) {
				tty->hw_stopped = 1;
				port->ops->stop_tx(port, 0);
			}
		}
	}
}

#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 */
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
	23	/*
	24	* The type definitions. These are from Ted Ts'o's serial.h
	25	*/
	26	#define PORT_UNKNOWN 0
	27	#define PORT_8250 1
	28	#define PORT_16450 2
	29	#define PORT_16550 3
	30	#define PORT_16550A 4
	31	#define PORT_CIRRUS 5
	32	#define PORT_16650 6
	33	#define PORT_16650V2 7
	34	#define PORT_16750 8
	35	#define PORT_STARTECH 9
	36	#define PORT_16C950 10
	37	#define PORT_16654 11
	38	#define PORT_16850 12
	39	#define PORT_RSA 13
	40	#define PORT_NS16550A 14
	41	#define PORT_XSCALE 15
	42	#define PORT_MAX_8250 15 /* max port ID */
	43
	44	/*
	45	* ARM specific type numbers. These are not currently guaranteed
	46	* to be implemented, and will change in the future. These are
	47	* separate so any additions to the old serial.c that occur before
	48	* we are merged can be easily merged here.
	49	*/
	50	#define PORT_PXA 31
	51	#define PORT_AMBA 32
	52	#define PORT_CLPS711X 33
	53	#define PORT_SA1100 34
	54	#define PORT_UART00 35
	55	#define PORT_21285 37
	56
	57	/* Sparc type numbers. */
	58	#define PORT_SUNZILOG 38
	59	#define PORT_SUNSAB 39
	60
	61	/* NEC v850. */
	62	#define PORT_V850E_UART 40
	63
	64	/* DZ */
65	#define PORT_DZ 47
66
67	/* Parisc type numbers. */
68	#define PORT_MUX 48
69
70	/* Macintosh Zilog type numbers */
71	#define PORT_MAC_ZILOG 50 /* m68k : not yet implemented */
72	#define PORT_PMAC_ZILOG 51
73
74	/* SH-SCI */
75	#define PORT_SCI 52
76	#define PORT_SCIF 53
77	#define PORT_IRDA 54
78
79	/* Samsung S3C2410 SoC and derivatives thereof */
80	#define PORT_S3C2410 55
81
82	/* SGI IP22 aka Indy / Challenge S / Indigo 2 */
83	#define PORT_IP22ZILOG 56
84
85	/* Sharp LH7a40x -- an ARM9 SoC series */
86	#define PORT_LH7A40X 57
87
88	/* PPC CPM type number */
89	#define PORT_CPM 58
90
91	/* MPC52xx type numbers */
92	#define PORT_MPC52xx 59
93
94	/* IBM icom */
95	#define PORT_ICOM 60
96
97	/* Samsung S3C2440 SoC */
98	#define PORT_S3C2440 61
99
100	/* Motorola i.MX SoC */
101	#define PORT_IMX 62
102
103	/* Marvell MPSC */
104	#define PORT_MPSC 63
105
106	/* TXX9 type number */
107	#define PORT_TXX9 64
108
109	/* NEC VR4100 series SIU/DSIU */
110	#define PORT_VR41XX_SIU 65
111	#define PORT_VR41XX_DSIU 66
112
113	/* Samsung S3C2400 SoC */
114	#define PORT_S3C2400 67
115
116	/* M32R SIO */
117	#define PORT_M32R_SIO 68
118
119	/Digi jsm /
120	#define PORT_JSM 65
121
122	#ifdef __KERNEL__
123
124	#include <linux/config.h>
661f83a6	125	#include <linux/compiler.h>
1da177e4 LT	126	#include <linux/interrupt.h>
	127	#include <linux/circ_buf.h>
	128	#include <linux/spinlock.h>
	129	#include <linux/sched.h>
	130	#include <linux/tty.h>
	131
	132	struct uart_port;
	133	struct uart_info;
	134	struct serial_struct;
	135	struct device;
	136
	137	/*
	138	* This structure describes all the operations that can be
	139	* done on the physical hardware.
	140	*/
	141	struct uart_ops {
	142	unsigned int (tx_empty)(struct uart_port );
	143	void (set_mctrl)(struct uart_port , unsigned int mctrl);
	144	unsigned int (get_mctrl)(struct uart_port );
	145	void (stop_tx)(struct uart_port , unsigned int tty_stop);
	146	void (start_tx)(struct uart_port , unsigned int tty_start);
	147	void (send_xchar)(struct uart_port , char ch);
	148	void (stop_rx)(struct uart_port );
	149	void (enable_ms)(struct uart_port );
	150	void (break_ctl)(struct uart_port , int ctl);
	151	int (startup)(struct uart_port );
	152	void (shutdown)(struct uart_port );
	153	void (set_termios)(struct uart_port , struct termios *new,
	154	struct termios *old);
	155	void (pm)(struct uart_port , unsigned int state,
	156	unsigned int oldstate);
	157	int (set_wake)(struct uart_port , unsigned int state);
	158
	159	/*
	160	* Return a string describing the type of the port
	161	*/
	162	const char (type)(struct uart_port *);
	163
	164	/*
	165	* Release IO and memory resources used by the port.
	166	* This includes iounmap if necessary.
	167	*/
	168	void (release_port)(struct uart_port );
	169
	170	/*
	171	* Request IO and memory resources used by the port.
	172	* This includes iomapping the port if necessary.
	173	*/
	174	int (request_port)(struct uart_port );
	175	void (config_port)(struct uart_port , int);
	176	int (verify_port)(struct uart_port , struct serial_struct *);
	177	int (ioctl)(struct uart_port , unsigned int, unsigned long);
	178	};
	179
	180	#define UART_CONFIG_TYPE (1 << 0)
	181	#define UART_CONFIG_IRQ (1 << 1)
	182
	183	struct uart_icount {
	184	__u32 cts;
	185	__u32 dsr;
	186	__u32 rng;
	187	__u32 dcd;
	188	__u32 rx;
	189	__u32 tx;
190	__u32 frame;
191	__u32 overrun;
192	__u32 parity;
193	__u32 brk;
194	__u32 buf_overrun;
195	};
196
197	struct uart_port {
198	spinlock_t lock; /* port lock */
199	unsigned int iobase; /* in/out[bwl] */
200	unsigned char __iomem membase; / read/write[bwl] */
201	unsigned int irq; /* irq number */
202	unsigned int uartclk; /* base uart clock */
203	unsigned char fifosize; /* tx fifo size */
204	unsigned char x_char; /* xon/xoff char */
205	unsigned char regshift; /* reg offset shift */
206	unsigned char iotype; /* io access style */
207
208	#define UPIO_PORT (0)
209	#define UPIO_HUB6 (1)
210	#define UPIO_MEM (2)
211	#define UPIO_MEM32 (3)
212
213	unsigned int read_status_mask; /* driver specific */
214	unsigned int ignore_status_mask; /* driver specific */
215	struct uart_info info; / pointer to parent info */
216	struct uart_icount icount; /* statistics */
217
218	struct console cons; / struct console, if any */
219	#ifdef CONFIG_SERIAL_CORE_CONSOLE
220	unsigned long sysrq; /* sysrq timeout */
221	#endif
222
223	unsigned int flags;
224
225	#define UPF_FOURPORT (1 << 1)
226	#define UPF_SAK (1 << 2)
227	#define UPF_SPD_MASK (0x1030)
228	#define UPF_SPD_HI (0x0010)
229	#define UPF_SPD_VHI (0x0020)
230	#define UPF_SPD_CUST (0x0030)
231	#define UPF_SPD_SHI (0x1000)
232	#define UPF_SPD_WARP (0x1010)
233	#define UPF_SKIP_TEST (1 << 6)
234	#define UPF_AUTO_IRQ (1 << 7)
235	#define UPF_HARDPPS_CD (1 << 11)
236	#define UPF_LOW_LATENCY (1 << 13)
237	#define UPF_BUGGY_UART (1 << 14)
238	#define UPF_AUTOPROBE (1 << 15)
239	#define UPF_MAGIC_MULTIPLIER (1 << 16)
240	#define UPF_BOOT_ONLYMCA (1 << 22)
241	#define UPF_CONS_FLOW (1 << 23)
242	#define UPF_SHARE_IRQ (1 << 24)
243	#define UPF_BOOT_AUTOCONF (1 << 28)
244	#define UPF_IOREMAP (1 << 31)
245
246	#define UPF_CHANGE_MASK (0x17fff)
247	#define UPF_USR_MASK (UPF_SPD_MASK\|UPF_LOW_LATENCY)
248
249	unsigned int mctrl; /* current modem ctrl settings */
250	unsigned int timeout; /* character-based timeout */
251	unsigned int type; /* port type */
252	struct uart_ops *ops;
253	unsigned int custom_divisor;
254	unsigned int line; /* port index */
255	unsigned long mapbase; /* for ioremap */
256	struct device dev; / parent device */
257	unsigned char hub6; /* this should be in the 8250 driver */
258	unsigned char unused[3];
259	};
260
261	/*
262	* This is the state information which is persistent across opens.
263	* The low level driver must not to touch any elements contained
264	* within.
265	*/
266	struct uart_state {
267	unsigned int close_delay; /* msec */
268	unsigned int closing_wait; /* msec */
269
270	#define USF_CLOSING_WAIT_INF (0)
271	#define USF_CLOSING_WAIT_NONE (~0U)
272
273	int count;
274	int pm_state;
275	struct uart_info *info;
276	struct uart_port *port;
277
278	struct semaphore sem;
279	};
280
281	#define UART_XMIT_SIZE PAGE_SIZE
282	/*
283	* This is the state information which is only valid when the port
284	* is open; it may be freed by the core driver once the device has
285	* been closed. Either the low level driver or the core can modify
286	* stuff here.
287	*/
288	struct uart_info {
289	struct tty_struct *tty;
290	struct circ_buf xmit;
291	unsigned int flags;
292
293	/*
294	* These are the flags that specific to info->flags, and reflect our
295	* internal state. They can not be accessed via port->flags. Low
296	* level drivers must not change these, but may query them instead.
297	*/
298	#define UIF_CHECK_CD (1 << 25)
299	#define UIF_CTS_FLOW (1 << 26)
300	#define UIF_NORMAL_ACTIVE (1 << 29)
301	#define UIF_INITIALIZED (1 << 31)
302
303	int blocked_open;
304
305	struct tasklet_struct tlet;
306
307	wait_queue_head_t open_wait;
308	wait_queue_head_t delta_msr_wait;
309	};
310
311	/* number of characters left in xmit buffer before we ask for more */
312	#define WAKEUP_CHARS 256
313
314	struct module;
315	struct tty_driver;
316
317	struct uart_driver {
318	struct module *owner;
319	const char *driver_name;
320	const char *dev_name;
321	const char *devfs_name;
322	int major;
323	int minor;
324	int nr;
325	struct console *cons;
326
327	/*
328	* these are private; the low level driver should not
329	* touch these; they should be initialised to NULL
330	*/
331	struct uart_state *state;
332	struct tty_driver *tty_driver;
333	};
334
335	void uart_write_wakeup(struct uart_port *port);
336
337	/*
338	* Baud rate helpers.
339	*/
340	void uart_update_timeout(struct uart_port *port, unsigned int cflag,
341	unsigned int baud);
342	unsigned int uart_get_baud_rate(struct uart_port port, struct termios termios,
343	struct termios *old, unsigned int min,
344	unsigned int max);
345	unsigned int uart_get_divisor(struct uart_port *port, unsigned int baud);
346
347	/*
348	* Console helpers.
349	*/
350	struct uart_port uart_get_console(struct uart_port ports, int nr,
351	struct console *c);
352	void uart_parse_options(char options, int baud, int parity, int bits,
353	int *flow);
354	int uart_set_options(struct uart_port port, struct console co, int baud,
355	int parity, int bits, int flow);
356	struct tty_driver uart_console_device(struct console co, int *index);
357
358	/*
359	* Port/driver registration/removal
360	*/
361	int uart_register_driver(struct uart_driver *uart);
362	void uart_unregister_driver(struct uart_driver *uart);
661f83a6 RK	363	void __deprecated uart_unregister_port(struct uart_driver *reg, int line);
661f83a6 RK	364	int __deprecated uart_register_port(struct uart_driver reg, struct uart_port port);
1da177e4 LT	365	int uart_add_one_port(struct uart_driver reg, struct uart_port port);
	366	int uart_remove_one_port(struct uart_driver reg, struct uart_port port);
	367	int uart_match_port(struct uart_port port1, struct uart_port port2);
	368
	369	/*
	370	* Power Management
	371	*/
	372	int uart_suspend_port(struct uart_driver reg, struct uart_port port);
	373	int uart_resume_port(struct uart_driver reg, struct uart_port port);
	374
	375	#define uart_circ_empty(circ) ((circ)->head == (circ)->tail)
	376	#define uart_circ_clear(circ) ((circ)->head = (circ)->tail = 0)
	377
	378	#define uart_circ_chars_pending(circ) \
	379	(CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
	380
	381	#define uart_circ_chars_free(circ) \
	382	(CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
	383
	384	#define uart_tx_stopped(port) \
	385	((port)->info->tty->stopped \|\| (port)->info->tty->hw_stopped)
	386
	387	/*
	388	* The following are helper functions for the low level drivers.
	389	*/
	390	#ifdef SUPPORT_SYSRQ
	391	static inline int
	392	uart_handle_sysrq_char(struct uart_port *port, unsigned int ch,
	393	struct pt_regs *regs)
	394	{
	395	if (port->sysrq) {
	396	if (ch && time_before(jiffies, port->sysrq)) {
	397	handle_sysrq(ch, regs, NULL);
	398	port->sysrq = 0;
	399	return 1;
	400	}
	401	port->sysrq = 0;
	402	}
	403	return 0;
	404	}
	405	#else
	406	#define uart_handle_sysrq_char(port,ch,regs) (0)
	407	#endif
	408
	409	/*
	410	* We do the SysRQ and SAK checking like this...
	411	*/
	412	static inline int uart_handle_break(struct uart_port *port)
	413	{
	414	struct uart_info *info = port->info;
	415	#ifdef SUPPORT_SYSRQ
	416	if (port->cons && port->cons->index == port->line) {
	417	if (!port->sysrq) {
	418	port->sysrq = jiffies + HZ*5;
	419	return 1;
	420	}
	421	port->sysrq = 0;
	422	}
	423	#endif
	424	if (info->flags & UPF_SAK)
	425	do_SAK(info->tty);
	426	return 0;
	427	}
	428
429	/**
430	* uart_handle_dcd_change - handle a change of carrier detect state
431	* @port: uart_port structure for the open port
432	* @status: new carrier detect status, nonzero if active
433	*/
434	static inline void
435	uart_handle_dcd_change(struct uart_port *port, unsigned int status)
436	{
437	struct uart_info *info = port->info;
438
439	port->icount.dcd++;
440
441	#ifdef CONFIG_HARD_PPS
442	if ((port->flags & UPF_HARDPPS_CD) && status)
443	hardpps();
444	#endif
445
446	if (info->flags & UIF_CHECK_CD) {
447	if (status)
448	wake_up_interruptible(&info->open_wait);
449	else if (info->tty)
450	tty_hangup(info->tty);
451	}
452	}
453
454	/**
455	* uart_handle_cts_change - handle a change of clear-to-send state
456	* @port: uart_port structure for the open port
457	* @status: new clear to send status, nonzero if active
458	*/
459	static inline void
460	uart_handle_cts_change(struct uart_port *port, unsigned int status)
461	{
462	struct uart_info *info = port->info;
463	struct tty_struct *tty = info->tty;
464
465	port->icount.cts++;
466
467	if (info->flags & UIF_CTS_FLOW) {
468	if (tty->hw_stopped) {
469	if (status) {
470	tty->hw_stopped = 0;
471	port->ops->start_tx(port, 0);
472	uart_write_wakeup(port);
473	}
474	} else {
475	if (!status) {
476	tty->hw_stopped = 1;
477	port->ops->stop_tx(port, 0);
478	}
479	}
480	}
481	}
482
05ab3014 RK	483	#include <linux/tty_flip.h>
	484
	485	static inline void
	486	uart_insert_char(struct uart_port *port, unsigned int status,
	487	unsigned int overrun, unsigned int ch, unsigned int flag)
	488	{
	489	struct tty_struct *tty = port->info->tty;
	490
	491	if ((status & port->ignore_status_mask & ~overrun) == 0)
	492	tty_insert_flip_char(tty, ch, flag);
	493
	494	/*
	495	* Overrun is special. Since it's reported immediately,
	496	* it doesn't affect the current character.
	497	*/
	498	if (status & ~port->ignore_status_mask & overrun)
	499	tty_insert_flip_char(tty, 0, TTY_OVERRUN);
	500	}
	501
1da177e4 LT	502	/*
	503	* UART_ENABLE_MS - determine if port should enable modem status irqs
	504	*/
	505	#define UART_ENABLE_MS(port,cflag) ((port)->flags & UPF_HARDPPS_CD \|\| \
	506	(cflag) & CRTSCTS \|\| \
	507	!((cflag) & CLOCAL))
	508
	509	#endif
	510
	511	#endif /* LINUX_SERIAL_CORE_H */