path: root/drivers/net/wan/pc300_tty.c

/*
 * pc300_tty.c	Cyclades-PC300(tm) TTY Driver.
 *
 * Author:	Regina Kodato <reginak@cyclades.com>
 *
 * Copyright:	(c) 1999-2002 Cyclades Corp.
 *
 *	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.
 *   
 *  $Log: pc300_tty.c,v $
 *  Revision 3.7  2002/03/07 14:17:09  henrique
 *  License data fixed
 *
 *  Revision 3.6  2001/12/10 12:29:42  regina
 *  Fix the MLPPP bug
 *
 *  Revision 3.5  2001/10/31 11:20:05  regina
 *  automatic pppd starts
 *
 *  Revision 3.4  2001/08/06 12:01:51  regina
 *  problem in DSR_DE bit
 *
 *  Revision 3.3  2001/07/26 22:58:41  regina
 *  update EDA value
 *
 *  Revision 3.2  2001/07/12 13:11:20  regina
 *  bug fix - DCD-OFF in pc300 tty driver
 *
 *	DMA transmission bug fix
 *  
 *  Revision 3.1  2001/06/22 13:13:02  regina
 *  MLPPP implementation
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/if.h>
#include <linux/skbuff.h>
/* TTY includes */
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>

#include <asm/io.h>
#include <asm/uaccess.h>

#include "pc300.h"

/* defines and macros */
/* TTY Global definitions */
#define	CPC_TTY_NPORTS	8	/* maximum number of the sync tty connections */
#define	CPC_TTY_MAJOR	CYCLADES_MAJOR	
#define CPC_TTY_MINOR_START	240	/* minor of the first PC300 interface */

#define CPC_TTY_MAX_MTU	2000	

/* tty interface state */
#define	CPC_TTY_ST_IDLE	0
#define CPC_TTY_ST_INIT	1	/* configured with MLPPP and up */
#define CPC_TTY_ST_OPEN	2	/* opened by application */

#define	CPC_TTY_LOCK(card,flags)\
	do {\
		spin_lock_irqsave(&card->card_lock, flags);	\
	} while (0)

#define CPC_TTY_UNLOCK(card,flags)	\
	do {\
		spin_unlock_irqrestore(&card->card_lock, flags);	\
	} while (0)

//#define	CPC_TTY_DBG(format,a...)	printk(format,##a)
#define	CPC_TTY_DBG(format,a...)

/* data structures */
typedef struct _st_cpc_rx_buf {
	struct _st_cpc_rx_buf	*next;
	int		size;
	unsigned char	data[1];
} st_cpc_rx_buf;

struct st_cpc_rx_list {
	st_cpc_rx_buf	*first;
	st_cpc_rx_buf	*last;
};

typedef	struct _st_cpc_tty_area {
	int		state;		/* state of the TTY interface */
	int		num_open;	
	unsigned int 	tty_minor;	/* minor this interface */
	volatile struct st_cpc_rx_list buf_rx;	/* ptr. to reception buffer */
	unsigned char*	buf_tx;		/* ptr. to transmission buffer */
	pc300dev_t*	pc300dev;	/* ptr. to info struct in PC300 driver */
	unsigned char	name[20];	/* interf. name + "-tty" */
	struct tty_struct *tty;		
	struct work_struct tty_tx_work; /* tx work - tx interrupt */
	struct work_struct tty_rx_work; /* rx work - rx interrupt */
	} st_cpc_tty_area;

/* TTY data structures */
static struct tty_driver serial_drv;

/* local variables */
st_cpc_tty_area	cpc_tty_area[CPC_TTY_NPORTS];

int cpc_tty_cnt=0;	/* number of intrfaces configured with MLPPP */
int cpc_tty_unreg_flag = 0;

/* TTY functions prototype */
static int cpc_tty_open(struct tty_struct *tty, struct file *flip);
static void cpc_tty_close(struct tty_struct *tty, struct file *flip);
static int cpc_tty_write(struct tty_struct *tty, const unsigned char *buf, int count);
static int cpc_tty_write_room(struct tty_struct *tty);
static int cpc_tty_chars_in_buffer(struct tty_struct *tty);
static void cpc_tty_flush_buffer(struct tty_struct *tty);
static void cpc_tty_hangup(struct tty_struct *tty);
static void cpc_tty_rx_work(void *data);
static void cpc_tty_tx_work(void *data);
static int cpc_tty_send_to_card(pc300dev_t *dev,void *buf, int len);
static void cpc_tty_trace(pc300dev_t *dev, char* buf, int len, char rxtx);
static void cpc_tty_signal_off(pc300dev_t *pc300dev, unsigned char);
static void cpc_tty_signal_on(pc300dev_t *pc300dev, unsigned char);

int pc300_tiocmset(struct tty_struct *, struct file *,
			unsigned int, unsigned int);
int pc300_tiocmget(struct tty_struct *, struct file *);

/* functions called by PC300 driver */
void cpc_tty_init(pc300dev_t *dev);
void cpc_tty_unregister_service(pc300dev_t *pc300dev);
void cpc_tty_receive(pc300dev_t *pc300dev);
void cpc_tty_trigger_poll(pc300dev_t *pc300dev);
void cpc_tty_reset_var(void);

/*
 * PC300 TTY clear "signal"
 */
static void cpc_tty_signal_off(pc300dev_t *pc300dev, unsigned char signal)
{
	pc300ch_t *pc300chan = (pc300ch_t