serial_s3c44b0x.h

S3C44B0x串行口驱动,支持两个UART口

/*
 * drivers/char/serial_s3c44b0x.h
 * 
 * Serial port driver for the Samsung S3C44B0X builtin UART
 *
 * Copyright (c) 2003 sympat GmbH
 * 	by Thomas Eschenbacher <[e-mail]>
 *
 * Based on: drivers/char/serial_s3c3410.h
 * Copyright (c) 2001, 2002  Arcturus Networks Inc.
 * 	by Oleksandr Zhadan <[e-mail]>
 *
 * Based on: drivers/char/trioserial.h
 * Copyright (c) 1998  Kenneth Albanowski <[e-mail]>,
 *                     D. Jeff Dionne <[e-mail]>,
 *                     The Silver Hammer Group, Ltd.
 *
 * Based on: drivers/char/68328serial.h
 * Copyright (C) 1995 David S. Miller ([e-mail])
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#ifndef __S3C44B0X_SERIAL_H
#define __S3C44B0X_SERIAL_H

#include <linux/config.h>
#include <asm/ioctl.h>
#include <asm/types.h>
#include <asm/page.h>
#include <asm/arch/hardware.h>

/*
 * For the close wait times, 0 means wait forever for serial port to
 * flush its output.  65535 means don't wait at all.
 */
#define S_CLOSING_WAIT_INF	0
#define S_CLOSING_WAIT_NONE	65535

/*
 * Definitions for S_struct (and serial_struct) flags field
 */
#define S_HUP_NOTIFY 	  0x0001 /* Notify getty on hangups and closes 
				    on the callout port */
#define S_FOURPORT  	  0x0002 /* Set OU1, OUT2 per AST Fourport settings */
#define S_SAK		  0x0004 /* Secure Attention Key (Orange book) */
#define S_SPLIT_TERMIOS   0x0008 /* Separate termios for dialin/callout */

#define S_SPD_MASK	  0x0030
#define S_SPD_HI	  0x0010 /* Use 56000 instead of 38400 bps */

#define S_SPD_VHI	  0x0020 /* Use 115200 instead of 38400 bps */
#define S_SPD_CUST	  0x0030 /* Use user-specified divisor */

#define S_SKIP_TEST	  0x0040 /* Skip UART test during autoconfiguration */
#define S_AUTO_IRQ  	  0x0080 /* Do automatic IRQ during autoconfiguration */
#define S_SESSION_LOCKOUT 0x0100 /* Lock out cua opens based on session */
#define S_PGRP_LOCKOUT    0x0200 /* Lock out cua opens based on pgrp */
#define S_CALLOUT_NOHUP   0x0400 /* Don't do hangups for cua device */

#define S_FLAGS		  0x0FFF /* Possible legal S flags */
#define S_USR_MASK 	  0x0430 /* Legal flags that non-privileged
				    users can set or reset */

/* Internal flags used only by kernel/chr_drv/serial.c */
#define S_INITIALIZED		0x80000000 /* Serial port was initialized */
#define S_CALLOUT_ACTIVE	0x40000000 /* Call out device is active */
#define S_NORMAL_ACTIVE		0x20000000 /* Normal device is active */
#define S_BOOT_AUTOCONF		0x10000000 /* Autoconfigure port on bootup */
#define S_CLOSING		0x08000000 /* Serial port is closing */
#define S_CTS_FLOW		0x04000000 /* Do CTS flow control */
#define S_CHECK_CD		0x02000000 /* i.e., CLOCAL */

/* Software state per channel */

/*
 * This is our internal structure for each serial port's state.
 * 
 * Many fields are paralleled by the structure used by the serial_struct
 * structure.
 *
 * For definitions of the flags field, see tty.h
 */

/* possible values for the ioctl */
typedef enum {
  SERIAL_MODE_NONE,          /**< disable serial-mode */
  SERIAL_MODE_RS422,         /**< RS422 full-duplex (standard mode) */
  SERIAL_MODE_RS422_LISTEN,  /**< RS422 with echo on RxD */
  SERIAL_MODE_RS485_ECHO,    /**< RS485 with echo (standard mode) */
	SERIAL_MODE_RS485_NO_ECHO, /**< RS485 without echo */
	SERIAL_MODE_DEFAULT	   /**< Default mode */
} serial_mode_t;

 /* IOCTL definitions */
#define TIOSERMODE _IOW('T', 0x01, serial_mode_t)

struct s3c44b0x_serial {
	char soft_carrier;  /* Use soft carrier on this channel */
	char break_abort;   /* Is serial console in, so process brk/abrt */
	char is_cons;       /* Is this our console. */

	/* We need to know the current clock divisor
	 * to read the bps rate the chip has currently
	 * loaded.
	 */
	unsigned char clk_divisor;  /* May be 1, 16, 32, or 64 */
	int 			baud;
	int			magic;
	int			baud_base;
	int			port;
	int			irq;
	int			irq_rx;
	int			irqmask;
	int			flags; 		/* defined in tty.h */
	int			type; 		/* UART type */
	int			use_ints;
	int			cts_state;
	struct tty_struct 	*tty;
	int			read_status_mask;
	int			ignore_status_mask;
	int			timeout;
	int			xmit_fifo_size;
	int			rx_fifo_size;
	int			custom_divisor;
	int			x_char;	/* xon/xoff character */
	int			close_delay;
	unsigned short		closing_wait;
	unsigned short		closing_wait2;
	unsigned long		event;
	unsigned long		last_active;
	int			line;
	int			count;	    /* # of fd on device */
	int			blocked_open; /* # of blocked opens */
	long			session; /* Session of opening process */
	long			pgrp; /* pgrp of opening process */
	unsigned char 		*xmit_buf;
	int			xmit_head;
	int			xmit_tail;
	int			xmit_cnt;
	struct tq_struct	tqueue;
	struct tq_struct	tqueue_hangup;
	struct termios		normal_termios;
	struct termios		callout_termios;
	wait_queue_head_t	open_wait;
	wait_queue_head_t	close_wait;
	int			uart_offset; /* offset to next uart */
	serial_mode_t 		ser_mode; /*  mode in which the driver runs */
};


/* typedef to correlate a serial speed with its cflags - type handle: */
typedef struct
{
  int rate;
  int cflag;
} s3c_baud_table_t;

#define RS_EVENT_WRITE_WAKEUP   0
#define SERIAL_MAGIC 0x5301

#endif /* !(__S3C44B0X_SERIAL_H) */