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/*
 *  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_RM9000	16	/* PMC-Sierra RM9xxx internal UART */
#define PORT_MAX_8250	16	/* 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
 
/* DEC */
#define PORT_DZ		46
#define PORT_ZS		47
 
/* Parisc type numbers. */
#define PORT_MUX	48
 
/* Atmel AT91 / AT32 SoC */
#define PORT_ATMEL	49
 
/* 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        69
 
#define PORT_PNX8XXX	70
 
/* Hilscher netx */
#define PORT_NETX	71
 
/* SUN4V Hypervisor Console */
#define PORT_SUNHV	72
 
#define PORT_S3C2412	73
 
/* Xilinx uartlite */
#define PORT_UARTLITE	74
 
/* Blackfin bf5xx */
#define PORT_BFIN	75
 
/* Micrel KS8695 */
#define PORT_KS8695	76
 
/* Broadcom SB1250, etc. SOC */
#define PORT_SB1250_DUART	77
 
/* Freescale ColdFire */
#define PORT_MCF	78
 
 
#ifdef __KERNEL__
 
#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>
 
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 ktermios *new,
				       struct ktermios *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;
};
 
typedef unsigned int __bitwise__ upf_t;
 
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 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_DWAPB		(6)			/* DesignWare APB UART */
#define UPIO_RM9000		(7)			/* RM9000 type IO */
 
	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
 
	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_MAGIC_MULTIPLIER	((__force upf_t) (1 << 16))
#define UPF_CONS_FLOW		((__force upf_t) (1 << 23))
#define UPF_SHARE_IRQ		((__force upf_t) (1 << 24))
#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		unused[2];
	void			*private_data;		/* generic platform data pointer */
};
 
/*
 * 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 mutex		mutex;
};
 
#define UART_XMIT_SIZE	PAGE_SIZE
 
typedef unsigned int __bitwise__ uif_t;
 
/*
 * 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;
	uif_t			flags;
 
/*
 * Definitions for info->flags.  These are _private_ to serial_core, and
 * are specific to this structure.  They may be queried by low level drivers.
 */
#define UIF_CHECK_CD		((__force uif_t) (1 << 25))
#define UIF_CTS_FLOW		((__force uif_t) (1 << 26))
#define UIF_NORMAL_ACTIVE	((__force uif_t) (1 << 29))
#define UIF_INITIALIZED		((__force uif_t) (1 << 31))
#define UIF_SUSPENDED		((__force uif_t) (1 << 30))
 
	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;
	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);
 
/*
 * 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))
 
#define uart_tx_stopped(port)		\
	((port)->info->tty->stopped || (port)->info->tty->hw_stopped)
 
/*
 * The following are helper functions for the low level drivers.
 */
static inline int
uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
{
#ifdef SUPPORT_SYSRQ
	if (port->sysrq) {
		if (ch && time_before(jiffies, port->sysrq)) {
			handle_sysrq(ch, port->info ? port->info->tty : NULL);
			port->sysrq = 0;
			return 1;
		}
		port->sysrq = 0;
	}
#endif
	return 0;
}
#ifndef SUPPORT_SYSRQ
#define uart_handle_sysrq_char(port,ch) uart_handle_sysrq_char(port, 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 (port->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 */