drivers/char/epca.c



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/*

 
	Copyright (C) 1996  Digi International.
 
	For technical support please email digiLinux@dgii.com or
	call Digi tech support at (612) 912-3456

	** This driver is no longer supported by Digi **

	Much of this design and code came from epca.c which was 
	copyright (C) 1994, 1995 Troy De Jongh, and subsquently 
	modified by David Nugent, Christoph Lameter, Mike McLagan. 
 
 	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., 675 Mass Ave, Cambridge, MA 02139, USA.

--------------------------------------------------------------------------- */
/* See README.epca for change history --DAT*/


#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/serial.h>
#include <linux/delay.h>
#include <linux/ctype.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <linux/spinlock.h>
#include <linux/pci.h>
#include "digiPCI.h"


#include "digi1.h"
#include "digiFep1.h"
#include "epca.h"
#include "epcaconfig.h"

/* ---------------------- Begin defines ------------------------ */

#define VERSION            "1.3.0.1-LK2.6"

/* This major needs to be submitted to Linux to join the majors list */

#define DIGIINFOMAJOR       35  /* For Digi specific ioctl */ 


#define MAXCARDS 7
#define epcaassert(x, msg)  if (!(x)) epca_error(__LINE__, msg)

#define PFX "epca: "

/* ----------------- Begin global definitions ------------------- */

static int nbdevs, num_cards, liloconfig;
static int digi_poller_inhibited = 1 ;

static int setup_error_code;
static int invalid_lilo_config;

/* The ISA boards do window flipping into the same spaces so its only sane
   with a single lock. It's still pretty efficient */

static spinlock_t epca_lock = SPIN_LOCK_UNLOCKED;

/* -----------------------------------------------------------------------
	MAXBOARDS is typically 12, but ISA and EISA cards are restricted to 
	7 below.
--------------------------------------------------------------------------*/
static struct board_info boards[MAXBOARDS];


/* ------------- Begin structures used for driver registeration ---------- */

static struct tty_driver *pc_driver;
static struct tty_driver *pc_info;

/* ------------------ Begin Digi specific structures -------------------- */

/* ------------------------------------------------------------------------
	digi_channels represents an array of structures that keep track of
	each channel of the Digi product.  Information such as transmit and
	receive pointers, termio data, and signal definitions (DTR, CTS, etc ...)
	are stored here.  This structure is NOT used to overlay the cards 
	physical channel structure.
-------------------------------------------------------------------------- */
  
static struct channel digi_channels[MAX_ALLOC];

/* ------------------------------------------------------------------------
	card_ptr is an array used to hold the address of the
	first channel structure of each card.  This array will hold
	the addresses of various channels located in digi_channels.
-------------------------------------------------------------------------- */
static struct channel *card_ptr[MAXCARDS];

static struct timer_list epca_timer;

/* ---------------------- Begin function prototypes --------------------- */

/* ----------------------------------------------------------------------
	Begin generic memory functions.  These functions will be alias
	(point at) more specific functions dependent on the board being
	configured.
----------------------------------------------------------------------- */
	
static void memwinon(struct board_info *b, unsigned int win);
static void memwinoff(struct board_info *b, unsigned int win);
static void globalwinon(struct channel *ch);
static void rxwinon(struct channel *ch);
static void txwinon(struct channel *ch);
static void memoff(struct channel *ch);
static void assertgwinon(struct channel *ch);
static void assertmemoff(struct channel *ch);

/* ---- Begin more 'specific' memory functions for cx_like products --- */

static void pcxem_memwinon(struct board_info *b, unsigned int win);
static void pcxem_memwinoff(struct board_info *b, unsigned int win);
static void pcxem_globalwinon(struct channel *ch);
static void pcxem_rxwinon(struct channel *ch);
static void pcxem_txwinon(struct channel *ch);
static void pcxem_memoff(struct channel *ch);

/* ------ Begin more 'specific' memory functions for the pcxe ------- */

static void pcxe_memwinon(struct board_info *b, unsigned int win);
static void pcxe_memwinoff(struct board_info *b, unsigned int win);
static void pcxe_globalwinon(struct channel *ch);
static void pcxe_rxwinon(struct channel *ch);
static void pcxe_txwinon(struct channel *ch);
static void pcxe_memoff(struct channel *ch);

/* ---- Begin more 'specific' memory functions for the pc64xe and pcxi ---- */
/* Note : pc64xe and pcxi share the same windowing routines */

static void pcxi_memwinon(struct board_info *b, unsigned int win);
static void pcxi_memwinoff(struct board_info *b, unsigned int win);
static void pcxi_globalwinon(struct channel *ch);
static void pcxi_rxwinon(struct channel *ch);
static void pcxi_txwinon(struct channel *ch);
static void pcxi_memoff(struct channel *ch);

/* - Begin 'specific' do nothing memory functions needed for some cards - */

static void dummy_memwinon(struct board_info *b, unsigned int win);
static void dummy_memwinoff(struct board_info *b, unsigned int win);
static void dummy_globalwinon(struct channel *ch);
static void dummy_rxwinon(struct channel *ch);
static void dummy_txwinon(struct channel *ch);
static void dummy_memoff(struct channel *ch);
static void dummy_assertgwinon(struct channel *ch);
static void dummy_assertmemoff(struct channel *ch);

/* ------------------- Begin declare functions ----------------------- */

static struct channel *verifyChannel(struct tty_struct *);
static void pc_sched_event(struct channel *, int);
static void epca_error(int, char *);
static void pc_close(struct tty_struct *, struct file *);
static void shutdown(struct channel *);
static void pc_hangup(struct tty_struct *);
static void pc_put_char(struct tty_struct *, unsigned char);
static int pc_write_room(struct tty_struct *);
static int pc_chars_in_buffer(struct tty_struct *);
static void pc_flush_buffer(struct tty_struct *);
static void pc_flush_chars(struct tty_struct *);
static int block_til_ready(struct tty_struct *, struct file *,
                           struct channel *);
static int pc_open(struct tty_struct *, struct file *);
static void post_fep_init(unsigned int crd);
static void epcapoll(unsigned long);
static void doevent(int);
static void fepcmd(struct channel *, int, int, int, int, int);
static unsigned termios2digi_h(struct channel *ch, unsigned);
static unsigned termios2digi_i(struct channel *ch, unsigned);
static unsigned termios2digi_c(struct channel *ch, unsigned);
static void epcaparam(struct tty_struct *, struct channel *);
static void receive_data(struct channel *);
static int pc_ioctl(struct tty_struct *, struct file *,
                    unsigned int, unsigned long);
static int info_ioctl(struct tty_struct *, struct file *,
                    unsigned int, unsigned long);
static void pc_set_termios(struct tty_struct *, struct termios *);
static void do_softint(void *);
static void pc_stop(struct tty_struct *);
static void pc_start(struct tty_struct *);
static void pc_throttle(struct tty_struct * tty);