drivers/tty/isicom.c


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/*
 *	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.
 *
 *	Original driver code supplied by Multi-Tech
 *
 *	Changes
 *	1/9/98	alan@lxorguk.ukuu.org.uk
 *					Merge to 2.0.x kernel tree
 *					Obtain and use official major/minors
 *					Loader switched to a misc device
 *					(fixed range check bug as a side effect)
 *					Printk clean up
 *	9/12/98	alan@lxorguk.ukuu.org.uk
 *					Rough port to 2.1.x
 *
 *	10/6/99 sameer			Merged the ISA and PCI drivers to
 *					a new unified driver.
 *
 *	3/9/99	sameer			Added support for ISI4616 cards.
 *
 *	16/9/99	sameer			We do not force RTS low anymore.
 *					This is to prevent the firmware
 *					from getting confused.
 *
 *	26/10/99 sameer			Cosmetic changes:The driver now
 *					dumps the Port Count information
 *					along with I/O address and IRQ.
 *
 *	13/12/99 sameer			Fixed the problem with IRQ sharing.
 *
 *	10/5/00  sameer			Fixed isicom_shutdown_board()
 *					to not lower DTR on all the ports
 *					when the last port on the card is
 *					closed.
 *
 *	10/5/00  sameer			Signal mask setup command added
 *					to  isicom_setup_port and
 *					isicom_shutdown_port.
 *
 *	24/5/00  sameer			The driver is now SMP aware.
 *
 *
 *	27/11/00 Vinayak P Risbud	Fixed the Driver Crash Problem
 *
 *
 *	03/01/01  anil .s		Added support for resetting the
 *					internal modems on ISI cards.
 *
 *	08/02/01  anil .s		Upgraded the driver for kernel
 *					2.4.x
 *
 *	11/04/01  Kevin			Fixed firmware load problem with
 *					ISIHP-4X card
 *
 *	30/04/01  anil .s		Fixed the remote login through
 *					ISI port problem. Now the link
 *					does not go down before password
 *					prompt.
 *
 *	03/05/01  anil .s		Fixed the problem with IRQ sharing
 *					among ISI-PCI cards.
 *
 *	03/05/01  anil .s		Added support to display the version
 *					info during insmod as well as module
 *					listing by lsmod.
 *
 *	10/05/01  anil .s		Done the modifications to the source
 *					file and Install script so that the
 *					same installation can be used for
 *					2.2.x and 2.4.x kernel.
 *
 *	06/06/01  anil .s		Now we drop both dtr and rts during
 *					shutdown_port as well as raise them
 *					during isicom_config_port.
 *
 *	09/06/01 acme@conectiva.com.br	use capable, not suser, do
 *					restore_flags on failure in
 *					isicom_send_break, verify put_user
 *					result
 *
 *	11/02/03  ranjeeth		Added support for 230 Kbps and 460 Kbps
 *					Baud index extended to 21
 *
 *	20/03/03  ranjeeth		Made to work for Linux Advanced server.
 *					Taken care of license warning.
 *
 *	10/12/03  Ravindra		Made to work for Fedora Core 1 of
 *					Red Hat Distribution
 *
 *	06/01/05  Alan Cox 		Merged the ISI and base kernel strands
 *					into a single 2.6 driver
 *
 *	***********************************************************
 *
 *	To use this driver you also need the support package. You
 *	can find this in RPM format on
 *		ftp://ftp.linux.org.uk/pub/linux/alan
 *
 *	You can find the original tools for this direct from Multitech
 *		ftp://ftp.multitech.com/ISI-Cards/
 *
 *	Having installed the cards the module options (/etc/modprobe.d/)
 *
 *	options isicom   io=card1,card2,card3,card4 irq=card1,card2,card3,card4
 *
 *	Omit those entries for boards you don't have installed.
 *
 *	TODO
 *		Merge testing
 *		64-bit verification
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/firmware.h>
#include <linux/kernel.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/termios.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/serial.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/slab.h>

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

#include <linux/pci.h>

#include <linux/isicom.h>

#define InterruptTheCard(base) outw(0, (base) + 0xc)
#define ClearInterrupt(base) inw((base) + 0x0a)

#ifdef DEBUG
#define isicom_paranoia_check(a, b, c) __isicom_paranoia_check((a), (b), (c))
#else
#define isicom_paranoia_check(a, b, c) 0
#endif

static int isicom_probe(struct pci_dev *, const struct pci_device_id *);
static void isicom_remove(struct pci_dev *);

static struct pci_device_id isicom_pci_tbl[] = {
	{ PCI_DEVICE(VENDOR_ID, 0x2028) },
	{ PCI_DEVICE(VENDOR_ID, 0x2051) },
	{ PCI_DEVICE(VENDOR_ID, 0x2052) },
	{ PCI_DEVICE(VENDOR_ID, 0x2053) },
	{ PCI_DEVICE(VENDOR_ID, 0x2054) },
	{ PCI_DEVICE(VENDOR_ID, 0x2055) },
	{ PCI_DEVICE(VENDOR_ID, 0x2056) },
	{ PCI_DEVICE(VENDOR_ID, 0x2057) },
	{ PCI_DEVICE(VENDOR_ID, 0x2058) },
	{ 0 }
};
MODULE_DEVICE_TABLE(pci, isicom_pci_tbl);

static struct pci_driver isicom_driver = {
	.name		= "isicom",
	.id_table	= isicom_pci_tbl,
	.probe		= isicom_probe,
	.remove		= isicom_remove
};

static int prev_card = 3;	/*	start servicing isi_card[0]	*/
static struct tty_driver *isicom_normal;

static void isicom_tx(unsigned long _data);
static void isicom_start(struct tty_struct *tty);

static DEFINE_TIMER(tx, isicom_tx, 0, 0);

/*   baud index mappings from linux defns to isi */

static signed char linuxb_to_isib[] = {
	-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 16, 17, 18, 19, 20, 21
};