[PATCH] drivers/char: Use ARRAY_SIZE macro

[safe/jmp/linux-2.6] / drivers / char / istallion.c

/*****************************************************************************/

/*
 *      istallion.c  -- stallion intelligent multiport serial driver.
 *
 *      Copyright (C) 1996-1999  Stallion Technologies
 *      Copyright (C) 1994-1996  Greg Ungerer.
 *
 *      This code is loosely based on the Linux serial driver, written by
 *      Linus Torvalds, Theodore T'so and others.
 *
 *      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.
 */

/*****************************************************************************/

#include <linux/config.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/cdk.h>
#include <linux/comstats.h>
#include <linux/istallion.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/device.h>
#include <linux/wait.h>

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

#ifdef CONFIG_PCI
#include <linux/pci.h>
#endif

/*****************************************************************************/

/*
 *      Define different board types. Not all of the following board types
 *      are supported by this driver. But I will use the standard "assigned"
 *      board numbers. Currently supported boards are abbreviated as:
 *      ECP = EasyConnection 8/64, ONB = ONboard, BBY = Brumby and
 *      STAL = Stallion.
 */
#define BRD_UNKNOWN     0
#define BRD_STALLION    1
#define BRD_BRUMBY4     2
#define BRD_ONBOARD2    3
#define BRD_ONBOARD     4
#define BRD_BRUMBY8     5
#define BRD_BRUMBY16    6
#define BRD_ONBOARDE    7
#define BRD_ONBOARD32   9
#define BRD_ONBOARD2_32 10
#define BRD_ONBOARDRS   11
#define BRD_EASYIO      20
#define BRD_ECH         21
#define BRD_ECHMC       22
#define BRD_ECP         23
#define BRD_ECPE        24
#define BRD_ECPMC       25
#define BRD_ECHPCI      26
#define BRD_ECH64PCI    27
#define BRD_EASYIOPCI   28
#define BRD_ECPPCI      29

#define BRD_BRUMBY      BRD_BRUMBY4

/*
 *      Define a configuration structure to hold the board configuration.
 *      Need to set this up in the code (for now) with the boards that are
 *      to be configured into the system. This is what needs to be modified
 *      when adding/removing/modifying boards. Each line entry in the
 *      stli_brdconf[] array is a board. Each line contains io/irq/memory
 *      ranges for that board (as well as what type of board it is).
 *      Some examples:
 *              { BRD_ECP, 0x2a0, 0, 0xcc000, 0, 0 },
 *      This line will configure an EasyConnection 8/64 at io address 2a0,
 *      and shared memory address of cc000. Multiple EasyConnection 8/64
 *      boards can share the same shared memory address space. No interrupt
 *      is required for this board type.
 *      Another example:
 *              { BRD_ECPE, 0x5000, 0, 0x80000000, 0, 0 },
 *      This line will configure an EasyConnection 8/64 EISA in slot 5 and
 *      shared memory address of 0x80000000 (2 GByte). Multiple
 *      EasyConnection 8/64 EISA boards can share the same shared memory
 *      address space. No interrupt is required for this board type.
 *      Another example:
 *              { BRD_ONBOARD, 0x240, 0, 0xd0000, 0, 0 },
 *      This line will configure an ONboard (ISA type) at io address 240,
 *      and shared memory address of d0000. Multiple ONboards can share
 *      the same shared memory address space. No interrupt required.
 *      Another example:
 *              { BRD_BRUMBY4, 0x360, 0, 0xc8000, 0, 0 },
 *      This line will configure a Brumby board (any number of ports!) at
 *      io address 360 and shared memory address of c8000. All Brumby boards
 *      configured into a system must have their own separate io and memory
 *      addresses. No interrupt is required.
 *      Another example:
 *              { BRD_STALLION, 0x330, 0, 0xd0000, 0, 0 },
 *      This line will configure an original Stallion board at io address 330
 *      and shared memory address d0000 (this would only be valid for a "V4.0"
 *      or Rev.O Stallion board). All Stallion boards configured into the
 *      system must have their own separate io and memory addresses. No
 *      interrupt is required.
 */

typedef struct {
        int             brdtype;
        int             ioaddr1;
        int             ioaddr2;
        unsigned long   memaddr;
        int             irq;
        int             irqtype;
} stlconf_t;

static stlconf_t        stli_brdconf[] = {
        /*{ BRD_ECP, 0x2a0, 0, 0xcc000, 0, 0 },*/
};

static int      stli_nrbrds = ARRAY_SIZE(stli_brdconf);

/*
 *      There is some experimental EISA board detection code in this driver.
 *      By default it is disabled, but for those that want to try it out,
 *      then set the define below to be 1.
 */
#define STLI_EISAPROBE  0

/*****************************************************************************/

/*
 *      Define some important driver characteristics. Device major numbers
 *      allocated as per Linux Device Registry.
 */
#ifndef STL_SIOMEMMAJOR
#define STL_SIOMEMMAJOR         28
#endif
#ifndef STL_SERIALMAJOR
#define STL_SERIALMAJOR         24
#endif
#ifndef STL_CALLOUTMAJOR
#define STL_CALLOUTMAJOR        25
#endif

/*****************************************************************************/

/*
 *      Define our local driver identity first. Set up stuff to deal with
 *      all the local structures required by a serial tty driver.
 */
static char     *stli_drvtitle = "Stallion Intelligent Multiport Serial Driver";
static char     *stli_drvname = "istallion";
static char     *stli_drvversion = "5.6.0";
static char     *stli_serialname = "ttyE";

static struct tty_driver        *stli_serial;

/*
 *      We will need to allocate a temporary write buffer for chars that
 *      come direct from user space. The problem is that a copy from user
 *      space might cause a page fault (typically on a system that is
 *      swapping!). All ports will share one buffer - since if the system
 *      is already swapping a shared buffer won't make things any worse.
 */
static char                     *stli_tmpwritebuf;
static DECLARE_MUTEX(stli_tmpwritesem);

#define STLI_TXBUFSIZE          4096

/*
 *      Use a fast local buffer for cooked characters. Typically a whole
 *      bunch of cooked characters come in for a port, 1 at a time. So we
 *      save those up into a local buffer, then write out the whole lot
 *      with a large memcpy. Just use 1 buffer for all ports, since its
 *      use it is only need for short periods of time by each port.
 */
static char                     *stli_txcookbuf;
static int                      stli_txcooksize;
static int                      stli_txcookrealsize;
static struct tty_struct        *stli_txcooktty;

/*
 *      Define a local default termios struct. All ports will be created
 *      with this termios initially. Basically all it defines is a raw port
 *      at 9600 baud, 8 data bits, no parity, 1 stop bit.
 */
static struct termios           stli_deftermios = {
        .c_cflag        = (B9600 | CS8 | CREAD | HUPCL | CLOCAL),
        .c_cc           = INIT_C_CC,
};

/*
 *      Define global stats structures. Not used often, and can be
 *      re-used for each stats call.
 */
static comstats_t       stli_comstats;
static combrd_t         stli_brdstats;
static asystats_t       stli_cdkstats;
static stlibrd_t        stli_dummybrd;
static stliport_t       stli_dummyport;

/*****************************************************************************/

static stlibrd_t        *stli_brds[STL_MAXBRDS];

static int              stli_shared;

/*
 *      Per board state flags. Used with the state field of the board struct.
 *      Not really much here... All we need to do is keep track of whether
 *      the board has been detected, and whether it is actually running a slave
 *      or not.
 */
#define BST_FOUND       0x1
#define BST_STARTED     0x2

/*
 *      Define the set of port state flags. These are marked for internal
 *      state purposes only, usually to do with the state of communications
 *      with the slave. Most of them need to be updated atomically, so always
 *      use the bit setting operations (unless protected by cli/sti).
 */
#define ST_INITIALIZING 1
#define ST_OPENING      2
#define ST_CLOSING      3
#define ST_CMDING       4
#define ST_TXBUSY       5
#define ST_RXING        6
#define ST_DOFLUSHRX    7
#define ST_DOFLUSHTX    8
#define ST_DOSIGS       9
#define ST_RXSTOP       10
#define ST_GETSIGS      11

/*
 *      Define an array of board names as printable strings. Handy for
 *      referencing boards when printing trace and stuff.
 */
static char     *stli_brdnames[] = {
        "Unknown",
        "Stallion",
        "Brumby",
        "ONboard-MC",
        "ONboard",
        "Brumby",
        "Brumby",
        "ONboard-EI",
        (char *) NULL,
        "ONboard",
        "ONboard-MC",
        "ONboard-MC",
        (char *) NULL,
        (char *) NULL,
        (char *) NULL,
        (char *) NULL,
        (char *) NULL,
        (char *) NULL,
        (char *) NULL,
        (char *) NULL,
        "EasyIO",
        "EC8/32-AT",
        "EC8/32-MC",
        "EC8/64-AT",
        "EC8/64-EI",
        "EC8/64-MC",
        "EC8/32-PCI",
        "EC8/64-PCI",
        "EasyIO-PCI",
        "EC/RA-PCI",
};

/*****************************************************************************/

#ifdef MODULE
/*
 *      Define some string labels for arguments passed from the module
 *      load line. These allow for easy board definitions, and easy
 *      modification of the io, memory and irq resoucres.
 */

static char     *board0[8];
static char     *board1[8];
static char     *board2[8];
static char     *board3[8];

static char     **stli_brdsp[] = {
        (char **) &board0,
        (char **) &board1,
        (char **) &board2,
        (char **) &board3
};

/*
 *      Define a set of common board names, and types. This is used to
 *      parse any module arguments.
 */

typedef struct stlibrdtype {
        char    *name;
        int     type;
} stlibrdtype_t;

static stlibrdtype_t    stli_brdstr[] = {
        { "stallion", BRD_STALLION },
        { "1", BRD_STALLION },
        { "brumby", BRD_BRUMBY },
        { "brumby4", BRD_BRUMBY },
        { "brumby/4", BRD_BRUMBY },
        { "brumby-4", BRD_BRUMBY },
        { "brumby8", BRD_BRUMBY },
        { "brumby/8", BRD_BRUMBY },
        { "brumby-8", BRD_BRUMBY },
        { "brumby16", BRD_BRUMBY },
        { "brumby/16", BRD_BRUMBY },
        { "brumby-16", BRD_BRUMBY },
        { "2", BRD_BRUMBY },
        { "onboard2", BRD_ONBOARD2 },
        { "onboard-2", BRD_ONBOARD2 },
        { "onboard/2", BRD_ONBOARD2 },
        { "onboard-mc", BRD_ONBOARD2 },
        { "onboard/mc", BRD_ONBOARD2 },
        { "onboard-mca", BRD_ONBOARD2 },
        { "onboard/mca", BRD_ONBOARD2 },
        { "3", BRD_ONBOARD2 },
        { "onboard", BRD_ONBOARD },
        { "onboardat", BRD_ONBOARD },
        { "4", BRD_ONBOARD },
        { "onboarde", BRD_ONBOARDE },
        { "onboard-e", BRD_ONBOARDE },
        { "onboard/e", BRD_ONBOARDE },
        { "onboard-ei", BRD_ONBOARDE },
        { "onboard/ei", BRD_ONBOARDE },
        { "7", BRD_ONBOARDE },
        { "ecp", BRD_ECP },
        { "ecpat", BRD_ECP },
        { "ec8/64", BRD_ECP },
        { "ec8/64-at", BRD_ECP },
        { "ec8/64-isa", BRD_ECP },
        { "23", BRD_ECP },
        { "ecpe", BRD_ECPE },
        { "ecpei", BRD_ECPE },
        { "ec8/64-e", BRD_ECPE },
        { "ec8/64-ei", BRD_ECPE },
        { "24", BRD_ECPE },
        { "ecpmc", BRD_ECPMC },
        { "ec8/64-mc", BRD_ECPMC },
        { "ec8/64-mca", BRD_ECPMC },
        { "25", BRD_ECPMC },
        { "ecppci", BRD_ECPPCI },
        { "ec/ra", BRD_ECPPCI },
        { "ec/ra-pc", BRD_ECPPCI },
        { "ec/ra-pci", BRD_ECPPCI },
        { "29", BRD_ECPPCI },
};

/*
 *      Define the module agruments.
 */
MODULE_AUTHOR("Greg Ungerer");
MODULE_DESCRIPTION("Stallion Intelligent Multiport Serial Driver");
MODULE_LICENSE("GPL");


MODULE_PARM(board0, "1-3s");
MODULE_PARM_DESC(board0, "Board 0 config -> name[,ioaddr[,memaddr]");
MODULE_PARM(board1, "1-3s");
MODULE_PARM_DESC(board1, "Board 1 config -> name[,ioaddr[,memaddr]");
MODULE_PARM(board2, "1-3s");
MODULE_PARM_DESC(board2, "Board 2 config -> name[,ioaddr[,memaddr]");
MODULE_PARM(board3, "1-3s");
MODULE_PARM_DESC(board3, "Board 3 config -> name[,ioaddr[,memaddr]");

#endif

/*
 *      Set up a default memory address table for EISA board probing.
 *      The default addresses are all bellow 1Mbyte, which has to be the
 *      case anyway. They should be safe, since we only read values from
 *      them, and interrupts are disabled while we do it. If the higher
 *      memory support is compiled in then we also try probing around
 *      the 1Gb, 2Gb and 3Gb areas as well...
 */
static unsigned long    stli_eisamemprobeaddrs[] = {
        0xc0000,    0xd0000,    0xe0000,    0xf0000,
        0x80000000, 0x80010000, 0x80020000, 0x80030000,
        0x40000000, 0x40010000, 0x40020000, 0x40030000,
        0xc0000000, 0xc0010000, 0xc0020000, 0xc0030000,
        0xff000000, 0xff010000, 0xff020000, 0xff030000,
};

static int      stli_eisamempsize = ARRAY_SIZE(stli_eisamemprobeaddrs);

/*
 *      Define the Stallion PCI vendor and device IDs.
 */
#ifdef CONFIG_PCI
#ifndef PCI_VENDOR_ID_STALLION
#define PCI_VENDOR_ID_STALLION          0x124d
#endif
#ifndef PCI_DEVICE_ID_ECRA
#define PCI_DEVICE_ID_ECRA              0x0004
#endif

static struct pci_device_id istallion_pci_tbl[] = {
        { PCI_VENDOR_ID_STALLION, PCI_DEVICE_ID_ECRA, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
        { 0 }
};
MODULE_DEVICE_TABLE(pci, istallion_pci_tbl);

#endif /* CONFIG_PCI */

/*****************************************************************************/

/*
 *      Hardware configuration info for ECP boards. These defines apply
 *      to the directly accessible io ports of the ECP. There is a set of
 *      defines for each ECP board type, ISA, EISA, MCA and PCI.
 */
#define ECP_IOSIZE      4

#define ECP_MEMSIZE     (128 * 1024)
#define ECP_PCIMEMSIZE  (256 * 1024)

#define ECP_ATPAGESIZE  (4 * 1024)
#define ECP_MCPAGESIZE  (4 * 1024)
#define ECP_EIPAGESIZE  (64 * 1024)
#define ECP_PCIPAGESIZE (64 * 1024)

#define STL_EISAID      0x8c4e

/*
 *      Important defines for the ISA class of ECP board.
 */
#define ECP_ATIREG      0
#define ECP_ATCONFR     1
#define ECP_ATMEMAR     2
#define ECP_ATMEMPR     3
#define ECP_ATSTOP      0x1
#define ECP_ATINTENAB   0x10
#define ECP_ATENABLE    0x20
#define ECP_ATDISABLE   0x00
#define ECP_ATADDRMASK  0x3f000
#define ECP_ATADDRSHFT  12

/*
 *      Important defines for the EISA class of ECP board.
 */
#define ECP_EIIREG      0
#define ECP_EIMEMARL    1
#define ECP_EICONFR     2
#define ECP_EIMEMARH    3
#define ECP_EIENABLE    0x1
#define ECP_EIDISABLE   0x0
#define ECP_EISTOP      0x4
#define ECP_EIEDGE      0x00
#define ECP_EILEVEL     0x80
#define ECP_EIADDRMASKL 0x00ff0000
#define ECP_EIADDRSHFTL 16
#define ECP_EIADDRMASKH 0xff000000
#define ECP_EIADDRSHFTH 24
#define ECP_EIBRDENAB   0xc84

#define ECP_EISAID      0x4

/*
 *      Important defines for the Micro-channel class of ECP board.
 *      (It has a lot in common with the ISA boards.)
 */
#define ECP_MCIREG      0
#define ECP_MCCONFR     1
#define ECP_MCSTOP      0x20
#define ECP_MCENABLE    0x80
#define ECP_MCDISABLE   0x00

/*
 *      Important defines for the PCI class of ECP board.
 *      (It has a lot in common with the other ECP boards.)
 */
#define ECP_PCIIREG     0
#define ECP_PCICONFR    1
#define ECP_PCISTOP     0x01

/*
 *      Hardware configuration info for ONboard and Brumby boards. These
 *      defines apply to the directly accessible io ports of these boards.
 */
#define ONB_IOSIZE      16
#define ONB_MEMSIZE     (64 * 1024)
#define ONB_ATPAGESIZE  (64 * 1024)
#define ONB_MCPAGESIZE  (64 * 1024)
#define ONB_EIMEMSIZE   (128 * 1024)
#define ONB_EIPAGESIZE  (64 * 1024)

/*
 *      Important defines for the ISA class of ONboard board.
 */
#define ONB_ATIREG      0
#define ONB_ATMEMAR     1
#define ONB_ATCONFR     2
#define ONB_ATSTOP      0x4
#define ONB_ATENABLE    0x01
#define ONB_ATDISABLE   0x00
#define ONB_ATADDRMASK  0xff0000
#define ONB_ATADDRSHFT  16

#define ONB_MEMENABLO   0
#define ONB_MEMENABHI   0x02

/*
 *      Important defines for the EISA class of ONboard board.
 */
#define ONB_EIIREG      0
#define ONB_EIMEMARL    1
#define ONB_EICONFR     2
#define ONB_EIMEMARH    3
#define ONB_EIENABLE    0x1
#define ONB_EIDISABLE   0x0
#define ONB_EISTOP      0x4
#define ONB_EIEDGE      0x00
#define ONB_EILEVEL     0x80
#define ONB_EIADDRMASKL 0x00ff0000
#define ONB_EIADDRSHFTL 16
#define ONB_EIADDRMASKH 0xff000000
#define ONB_EIADDRSHFTH 24
#define ONB_EIBRDENAB   0xc84

#define ONB_EISAID      0x1

/*
 *      Important defines for the Brumby boards. They are pretty simple,
 *      there is not much that is programmably configurable.
 */
#define BBY_IOSIZE      16
#define BBY_MEMSIZE     (64 * 1024)
#define BBY_PAGESIZE    (16 * 1024)

#define BBY_ATIREG      0
#define BBY_ATCONFR     1
#define BBY_ATSTOP      0x4

/*
 *      Important defines for the Stallion boards. They are pretty simple,
 *      there is not much that is programmably configurable.
 */
#define STAL_IOSIZE     16
#define STAL_MEMSIZE    (64 * 1024)
#define STAL_PAGESIZE   (64 * 1024)

/*
 *      Define the set of status register values for EasyConnection panels.
 *      The signature will return with the status value for each panel. From
 *      this we can determine what is attached to the board - before we have
 *      actually down loaded any code to it.
 */
#define ECH_PNLSTATUS   2
#define ECH_PNL16PORT   0x20
#define ECH_PNLIDMASK   0x07
#define ECH_PNLXPID     0x40
#define ECH_PNLINTRPEND 0x80

/*
 *      Define some macros to do things to the board. Even those these boards
 *      are somewhat related there is often significantly different ways of
 *      doing some operation on it (like enable, paging, reset, etc). So each
 *      board class has a set of functions which do the commonly required
 *      operations. The macros below basically just call these functions,
 *      generally checking for a NULL function - which means that the board
 *      needs nothing done to it to achieve this operation!
 */
#define EBRDINIT(brdp)                                          \
        if (brdp->init != NULL)                                 \
                (* brdp->init)(brdp)

#define EBRDENABLE(brdp)                                        \
        if (brdp->enable != NULL)                               \
                (* brdp->enable)(brdp);

#define EBRDDISABLE(brdp)                                       \
        if (brdp->disable != NULL)                              \
                (* brdp->disable)(brdp);

#define EBRDINTR(brdp)                                          \
        if (brdp->intr != NULL)                                 \
                (* brdp->intr)(brdp);

#define EBRDRESET(brdp)                                         \
        if (brdp->reset != NULL)                                \
                (* brdp->reset)(brdp);

#define EBRDGETMEMPTR(brdp,offset)                              \
        (* brdp->getmemptr)(brdp, offset, __LINE__)

/*
 *      Define the maximal baud rate, and the default baud base for ports.
 */
#define STL_MAXBAUD     460800
#define STL_BAUDBASE    115200
#define STL_CLOSEDELAY  (5 * HZ / 10)

/*****************************************************************************/

/*
 *      Define macros to extract a brd or port number from a minor number.
 */
#define MINOR2BRD(min)          (((min) & 0xc0) >> 6)
#define MINOR2PORT(min)         ((min) & 0x3f)

/*
 *      Define a baud rate table that converts termios baud rate selector
 *      into the actual baud rate value. All baud rate calculations are based
 *      on the actual baud rate required.
 */
static unsigned int     stli_baudrates[] = {
        0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
        9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600
};

/*****************************************************************************/

/*
 *      Define some handy local macros...
 */
#undef MIN
#define MIN(a,b)        (((a) <= (b)) ? (a) : (b))

#undef  TOLOWER
#define TOLOWER(x)      ((((x) >= 'A') && ((x) <= 'Z')) ? ((x) + 0x20) : (x))

/*****************************************************************************/

/*
 *      Prototype all functions in this driver!
 */

#ifdef MODULE
static void     stli_argbrds(void);
static int      stli_parsebrd(stlconf_t *confp, char **argp);

static unsigned long    stli_atol(char *str);
#endif

int             stli_init(void);
static int      stli_open(struct tty_struct *tty, struct file *filp);
static void     stli_close(struct tty_struct *tty, struct file *filp);
static int      stli_write(struct tty_struct *tty, const unsigned char *buf, int count);
static void     stli_putchar(struct tty_struct *tty, unsigned char ch);
static void     stli_flushchars(struct tty_struct *tty);
static int      stli_writeroom(struct tty_struct *tty);
static int      stli_charsinbuffer(struct tty_struct *tty);
static int      stli_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
static void     stli_settermios(struct tty_struct *tty, struct termios *old);
static void     stli_throttle(struct tty_struct *tty);
static void     stli_unthrottle(struct tty_struct *tty);
static void     stli_stop(struct tty_struct *tty);
static void     stli_start(struct tty_struct *tty);
static void     stli_flushbuffer(struct tty_struct *tty);
static void     stli_breakctl(struct tty_struct *tty, int state);
static void     stli_waituntilsent(struct tty_struct *tty, int timeout);
static void     stli_sendxchar(struct tty_struct *tty, char ch);
static void     stli_hangup(struct tty_struct *tty);
static int      stli_portinfo(stlibrd_t *brdp, stliport_t *portp, int portnr, char *pos);

static int      stli_brdinit(stlibrd_t *brdp);
static int      stli_startbrd(stlibrd_t *brdp);
static ssize_t  stli_memread(struct file *fp, char __user *buf, size_t count, loff_t *offp);
static ssize_t  stli_memwrite(struct file *fp, const char __user *buf, size_t count, loff_t *offp);
static int      stli_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, unsigned long arg);
static void     stli_brdpoll(stlibrd_t *brdp, volatile cdkhdr_t *hdrp);
static void     stli_poll(unsigned long arg);
static int      stli_hostcmd(stlibrd_t *brdp, stliport_t *portp);
static int      stli_initopen(stlibrd_t *brdp, stliport_t *portp);
static int      stli_rawopen(stlibrd_t *brdp, stliport_t *portp, unsigned long arg, int wait);
static int      stli_rawclose(stlibrd_t *brdp, stliport_t *portp, unsigned long arg, int wait);
static int      stli_waitcarrier(stlibrd_t *brdp, stliport_t *portp, struct file *filp);
static void     stli_dohangup(void *arg);
static int      stli_setport(stliport_t *portp);
static int      stli_cmdwait(stlibrd_t *brdp, stliport_t *portp, unsigned long cmd, void *arg, int size, int copyback);
static void     stli_sendcmd(stlibrd_t *brdp, stliport_t *portp, unsigned long cmd, void *arg, int size, int copyback);
static void     stli_dodelaycmd(stliport_t *portp, volatile cdkctrl_t *cp);
static void     stli_mkasyport(stliport_t *portp, asyport_t *pp, struct termios *tiosp);
static void     stli_mkasysigs(asysigs_t *sp, int dtr, int rts);
static long     stli_mktiocm(unsigned long sigvalue);
static void     stli_read(stlibrd_t *brdp, stliport_t *portp);
static int      stli_getserial(stliport_t *portp, struct serial_struct __user *sp);
static int      stli_setserial(stliport_t *portp, struct serial_struct __user *sp);
static int      stli_getbrdstats(combrd_t __user *bp);
static int      stli_getportstats(stliport_t *portp, comstats_t __user *cp);
static int      stli_portcmdstats(stliport_t *portp);
static int      stli_clrportstats(stliport_t *portp, comstats_t __user *cp);
static int      stli_getportstruct(stliport_t __user *arg);
static int      stli_getbrdstruct(stlibrd_t __user *arg);
static void     *stli_memalloc(int len);
static stlibrd_t *stli_allocbrd(void);

static void     stli_ecpinit(stlibrd_t *brdp);
static void     stli_ecpenable(stlibrd_t *brdp);
static void     stli_ecpdisable(stlibrd_t *brdp);
static char     *stli_ecpgetmemptr(stlibrd_t *brdp, unsigned long offset, int line);
static void     stli_ecpreset(stlibrd_t *brdp);
static void     stli_ecpintr(stlibrd_t *brdp);
static void     stli_ecpeiinit(stlibrd_t *brdp);
static void     stli_ecpeienable(stlibrd_t *brdp);
static void     stli_ecpeidisable(stlibrd_t *brdp);
static char     *stli_ecpeigetmemptr(stlibrd_t *brdp, unsigned long offset, int line);
static void     stli_ecpeireset(stlibrd_t *brdp);
static void     stli_ecpmcenable(stlibrd_t *brdp);
static void     stli_ecpmcdisable(stlibrd_t *brdp);
static char     *stli_ecpmcgetmemptr(stlibrd_t *brdp, unsigned long offset, int line);
static void     stli_ecpmcreset(stlibrd_t *brdp);
static void     stli_ecppciinit(stlibrd_t *brdp);
static char     *stli_ecppcigetmemptr(stlibrd_t *brdp, unsigned long offset, int line);
static void     stli_ecppcireset(stlibrd_t *brdp);

static void     stli_onbinit(stlibrd_t *brdp);
static void     stli_onbenable(stlibrd_t *brdp);
static void     stli_onbdisable(stlibrd_t *brdp);
static char     *stli_onbgetmemptr(stlibrd_t *brdp, unsigned long offset, int line);
static void     stli_onbreset(stlibrd_t *brdp);
static void     stli_onbeinit(stlibrd_t *brdp);
static void     stli_onbeenable(stlibrd_t *brdp);
static void     stli_onbedisable(stlibrd_t *brdp);
static char     *stli_onbegetmemptr(stlibrd_t *brdp, unsigned long offset, int line);
static void     stli_onbereset(stlibrd_t *brdp);
static void     stli_bbyinit(stlibrd_t *brdp);
static char     *stli_bbygetmemptr(stlibrd_t *brdp, unsigned long offset, int line);
static void     stli_bbyreset(stlibrd_t *brdp);
static void     stli_stalinit(stlibrd_t *brdp);
static char     *stli_stalgetmemptr(stlibrd_t *brdp, unsigned long offset, int line);
static void     stli_stalreset(stlibrd_t *brdp);

static stliport_t *stli_getport(int brdnr, int panelnr, int portnr);

static int      stli_initecp(stlibrd_t *brdp);
static int      stli_initonb(stlibrd_t *brdp);
static int      stli_eisamemprobe(stlibrd_t *brdp);
static int      stli_initports(stlibrd_t *brdp);

#ifdef  CONFIG_PCI
static int      stli_initpcibrd(int brdtype, struct pci_dev *devp);
#endif

/*****************************************************************************/

/*
 *      Define the driver info for a user level shared memory device. This
 *      device will work sort of like the /dev/kmem device - except that it
 *      will give access to the shared memory on the Stallion intelligent
 *      board. This is also a very useful debugging tool.
 */
static struct file_operations   stli_fsiomem = {
        .owner          = THIS_MODULE,
        .read           = stli_memread,
        .write          = stli_memwrite,
        .ioctl          = stli_memioctl,
};

/*****************************************************************************/

/*
 *      Define a timer_list entry for our poll routine. The slave board
 *      is polled every so often to see if anything needs doing. This is
 *      much cheaper on host cpu than using interrupts. It turns out to
 *      not increase character latency by much either...
 */
static DEFINE_TIMER(stli_timerlist, stli_poll, 0, 0);

static int      stli_timeron;

/*
 *      Define the calculation for the timeout routine.
 */
#define STLI_TIMEOUT    (jiffies + 1)

/*****************************************************************************/

static struct class *istallion_class;

#ifdef MODULE

/*
 *      Loadable module initialization stuff.
 */

static int __init istallion_module_init(void)
{
        unsigned long   flags;

#ifdef DEBUG
        printk("init_module()\n");
#endif

        save_flags(flags);
        cli();
        stli_init();
        restore_flags(flags);

        return(0);
}

/*****************************************************************************/

static void __exit istallion_module_exit(void)
{
        stlibrd_t       *brdp;
        stliport_t      *portp;
        unsigned long   flags;
        int             i, j;

#ifdef DEBUG
        printk("cleanup_module()\n");
#endif

        printk(KERN_INFO "Unloading %s: version %s\n", stli_drvtitle,
                stli_drvversion);

        save_flags(flags);
        cli();

/*
 *      Free up all allocated resources used by the ports. This includes
 *      memory and interrupts.
 */
        if (stli_timeron) {
                stli_timeron = 0;
                del_timer(&stli_timerlist);
        }

        i = tty_unregister_driver(stli_serial);
        if (i) {
                printk("STALLION: failed to un-register tty driver, "
                        "errno=%d\n", -i);
                restore_flags(flags);
                return;
        }
        put_tty_driver(stli_serial);
        for (i = 0; i < 4; i++) {
                devfs_remove("staliomem/%d", i);
                class_device_destroy(istallion_class, MKDEV(STL_SIOMEMMAJOR, i));
        }
        devfs_remove("staliomem");
        class_destroy(istallion_class);
        if ((i = unregister_chrdev(STL_SIOMEMMAJOR, "staliomem")))
                printk("STALLION: failed to un-register serial memory device, "
                        "errno=%d\n", -i);

        kfree(stli_tmpwritebuf);
        kfree(stli_txcookbuf);

        for (i = 0; (i < stli_nrbrds); i++) {
                if ((brdp = stli_brds[i]) == (stlibrd_t *) NULL)
                        continue;
                for (j = 0; (j < STL_MAXPORTS); j++) {
                        portp = brdp->ports[j];
                        if (portp != (stliport_t *) NULL) {
                                if (portp->tty != (struct tty_struct *) NULL)
                                        tty_hangup(portp->tty);
                                kfree(portp);
                        }
                }

                iounmap(brdp->membase);
                if (brdp->iosize > 0)
                        release_region(brdp->iobase, brdp->iosize);
                kfree(brdp);
                stli_brds[i] = (stlibrd_t *) NULL;
        }

        restore_flags(flags);
}

module_init(istallion_module_init);
module_exit(istallion_module_exit);

/*****************************************************************************/

/*
 *      Check for any arguments passed in on the module load command line.
 */

static void stli_argbrds(void)
{
        stlconf_t       conf;
        stlibrd_t       *brdp;
        int             i;

#ifdef DEBUG
        printk("stli_argbrds()\n");
#endif

        for (i = stli_nrbrds; i < ARRAY_SIZE(stli_brdsp); i++) {
                memset(&conf, 0, sizeof(conf));
                if (stli_parsebrd(&conf, stli_brdsp[i]) == 0)
                        continue;
                if ((brdp = stli_allocbrd()) == (stlibrd_t *) NULL)
                        continue;
                stli_nrbrds = i + 1;
                brdp->brdnr = i;
                brdp->brdtype = conf.brdtype;
                brdp->iobase = conf.ioaddr1;
                brdp->memaddr = conf.memaddr;
                stli_brdinit(brdp);
        }
}

/*****************************************************************************/

/*
 *      Convert an ascii string number into an unsigned long.
 */

static unsigned long stli_atol(char *str)
{
        unsigned long   val;
        int             base, c;
        char            *sp;

        val = 0;
        sp = str;
        if ((*sp == '0') && (*(sp+1) == 'x')) {
                base = 16;
                sp += 2;
        } else if (*sp == '0') {
                base = 8;
                sp++;
        } else {
                base = 10;
        }

        for (; (*sp != 0); sp++) {
                c = (*sp > '9') ? (TOLOWER(*sp) - 'a' + 10) : (*sp - '0');
                if ((c < 0) || (c >= base)) {
                        printk("STALLION: invalid argument %s\n", str);
                        val = 0;
                        break;
                }
                val = (val * base) + c;
        }
        return(val);
}

/*****************************************************************************/

/*
 *      Parse the supplied argument string, into the board conf struct.
 */

static int stli_parsebrd(stlconf_t *confp, char **argp)
{
        char    *sp;
        int     i;

#ifdef DEBUG
        printk("stli_parsebrd(confp=%x,argp=%x)\n", (int) confp, (int) argp);
#endif

        if ((argp[0] == (char *) NULL) || (*argp[0] == 0))
                return(0);

        for (sp = argp[0], i = 0; ((*sp != 0) && (i < 25)); sp++, i++)
                *sp = TOLOWER(*sp);

        for (i = 0; i < ARRAY_SIZE(stli_brdstr); i++) {
                if (strcmp(stli_brdstr[i].name, argp[0]) == 0)
                        break;
        }
        if (i == ARRAY_SIZE(stli_brdstr)) {
                printk("STALLION: unknown board name, %s?\n", argp[0]);
                return 0;
        }

        confp->brdtype = stli_brdstr[i].type;
        if ((argp[1] != (char *) NULL) && (*argp[1] != 0))
                confp->ioaddr1 = stli_atol(argp[1]);
        if ((argp[2] != (char *) NULL) && (*argp[2] != 0))
                confp->memaddr = stli_atol(argp[2]);
        return(1);
}

#endif

/*****************************************************************************/

/*
 *      Local driver kernel malloc routine.
 */

static void *stli_memalloc(int len)
{
        return((void *) kmalloc(len, GFP_KERNEL));
}

/*****************************************************************************/

static int stli_open(struct tty_struct *tty, struct file *filp)
{
        stlibrd_t       *brdp;
        stliport_t      *portp;
        unsigned int    minordev;
        int             brdnr, portnr, rc;

#ifdef DEBUG
        printk("stli_open(tty=%x,filp=%x): device=%s\n", (int) tty,
                (int) filp, tty->name);
#endif

        minordev = tty->index;
        brdnr = MINOR2BRD(minordev);
        if (brdnr >= stli_nrbrds)
                return(-ENODEV);
        brdp = stli_brds[brdnr];
        if (brdp == (stlibrd_t *) NULL)
                return(-ENODEV);
        if ((brdp->state & BST_STARTED) == 0)
                return(-ENODEV);
        portnr = MINOR2PORT(minordev);
        if ((portnr < 0) || (portnr > brdp->nrports))
                return(-ENODEV);

        portp = brdp->ports[portnr];
        if (portp == (stliport_t *) NULL)
                return(-ENODEV);
        if (portp->devnr < 1)
                return(-ENODEV);


/*
 *      Check if this port is in the middle of closing. If so then wait
 *      until it is closed then return error status based on flag settings.
 *      The sleep here does not need interrupt protection since the wakeup
 *      for it is done with the same context.
 */
        if (portp->flags & ASYNC_CLOSING) {
                interruptible_sleep_on(&portp->close_wait);
                if (portp->flags & ASYNC_HUP_NOTIFY)
                        return(-EAGAIN);
                return(-ERESTARTSYS);
        }

/*
 *      On the first open of the device setup the port hardware, and
 *      initialize the per port data structure. Since initializing the port
 *      requires several commands to the board we will need to wait for any
 *      other open that is already initializing the port.
 */
        portp->tty = tty;
        tty->driver_data = portp;
        portp->refcount++;

        wait_event_interruptible(portp->raw_wait,
                        !test_bit(ST_INITIALIZING, &portp->state));
        if (signal_pending(current))
                return(-ERESTARTSYS);

        if ((portp->flags & ASYNC_INITIALIZED) == 0) {
                set_bit(ST_INITIALIZING, &portp->state);
                if ((rc = stli_initopen(brdp, portp)) >= 0) {
                        portp->flags |= ASYNC_INITIALIZED;
                        clear_bit(TTY_IO_ERROR, &tty->flags);
                }
                clear_bit(ST_INITIALIZING, &portp->state);
                wake_up_interruptible(&portp->raw_wait);
                if (rc < 0)
                        return(rc);
        }

/*
 *      Check if this port is in the middle of closing. If so then wait
 *      until it is closed then return error status, based on flag settings.
 *      The sleep here does not need interrupt protection since the wakeup
 *      for it is done with the same context.
 */
        if (portp->flags & ASYNC_CLOSING) {
                interruptible_sleep_on(&portp->close_wait);
                if (portp->flags & ASYNC_HUP_NOTIFY)
                        return(-EAGAIN);
                return(-ERESTARTSYS);
        }

/*
 *      Based on type of open being done check if it can overlap with any
 *      previous opens still in effect. If we are a normal serial device
 *      then also we might have to wait for carrier.
 */
        if (!(filp->f_flags & O_NONBLOCK)) {
                if ((rc = stli_waitcarrier(brdp, portp, filp)) != 0)
                        return(rc);
        }
        portp->flags |= ASYNC_NORMAL_ACTIVE;
        return(0);
}

/*****************************************************************************/

static void stli_close(struct tty_struct *tty, struct file *filp)
{
        stlibrd_t       *brdp;
        stliport_t      *portp;
        unsigned long   flags;

#ifdef DEBUG
        printk("stli_close(tty=%x,filp=%x)\n", (int) tty, (int) filp);
#endif

        portp = tty->driver_data;
        if (portp == (stliport_t *) NULL)
                return;

        save_flags(flags);
        cli();
        if (tty_hung_up_p(filp)) {
                restore_flags(flags);
                return;
        }
        if ((tty->count == 1) && (portp->refcount != 1))
                portp->refcount = 1;
        if (portp->refcount-- > 1) {
                restore_flags(flags);
                return;
        }

        portp->flags |= ASYNC_CLOSING;

/*
 *      May want to wait for data to drain before closing. The BUSY flag
 *      keeps track of whether we are still transmitting or not. It is
 *      updated by messages from the slave - indicating when all chars
 *      really have drained.
 */
        if (tty == stli_txcooktty)
                stli_flushchars(tty);
        tty->closing = 1;
        if (portp->closing_wait != ASYNC_CLOSING_WAIT_NONE)
                tty_wait_until_sent(tty, portp->closing_wait);

        portp->flags &= ~ASYNC_INITIALIZED;
        brdp = stli_brds[portp->brdnr];
        stli_rawclose(brdp, portp, 0, 0);
        if (tty->termios->c_cflag & HUPCL) {
                stli_mkasysigs(&portp->asig, 0, 0);
                if (test_bit(ST_CMDING, &portp->state))
                        set_bit(ST_DOSIGS, &portp->state);
                else
                        stli_sendcmd(brdp, portp, A_SETSIGNALS, &portp->asig,
                                sizeof(asysigs_t), 0);
        }
        clear_bit(ST_TXBUSY, &portp->state);
        clear_bit(ST_RXSTOP, &portp->state);
        set_bit(TTY_IO_ERROR, &tty->flags);
        if (tty->ldisc.flush_buffer)
                (tty->ldisc.flush_buffer)(tty);
        set_bit(ST_DOFLUSHRX, &portp->state);
        stli_flushbuffer(tty);

        tty->closing = 0;
        portp->tty = (struct tty_struct *) NULL;

        if (portp->openwaitcnt) {
                if (portp->close_delay)
                        msleep_interruptible(jiffies_to_msecs(portp->close_delay));
                wake_up_interruptible(&portp->open_wait);
        }

        portp->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
        wake_up_interruptible(&portp->close_wait);
        restore_flags(flags);
}

/*****************************************************************************/

/*
 *      Carry out first open operations on a port. This involves a number of
 *      commands to be sent to the slave. We need to open the port, set the
 *      notification events, set the initial port settings, get and set the
 *      initial signal values. We sleep and wait in between each one. But
 *      this still all happens pretty quickly.
 */

static int stli_initopen(stlibrd_t *brdp, stliport_t *portp)
{
        struct tty_struct       *tty;
        asynotify_t             nt;
        asyport_t               aport;
        int                     rc;

#ifdef DEBUG
        printk("stli_initopen(brdp=%x,portp=%x)\n", (int) brdp, (int) portp);
#endif

        if ((rc = stli_rawopen(brdp, portp, 0, 1)) < 0)
                return(rc);

        memset(&nt, 0, sizeof(asynotify_t));
        nt.data = (DT_TXLOW | DT_TXEMPTY | DT_RXBUSY | DT_RXBREAK);
        nt.signal = SG_DCD;
        if ((rc = stli_cmdwait(brdp, portp, A_SETNOTIFY, &nt,
            sizeof(asynotify_t), 0)) < 0)
                return(rc);

        tty = portp->tty;
        if (tty == (struct tty_struct *) NULL)
                return(-ENODEV);
        stli_mkasyport(portp, &aport, tty->termios);
        if ((rc = stli_cmdwait(brdp, portp, A_SETPORT, &aport,
            sizeof(asyport_t), 0)) < 0)
                return(rc);

        set_bit(ST_GETSIGS, &portp->state);
        if ((rc = stli_cmdwait(brdp, portp, A_GETSIGNALS, &portp->asig,
            sizeof(asysigs_t), 1)) < 0)
                return(rc);
        if (test_and_clear_bit(ST_GETSIGS, &portp->state))
                portp->sigs = stli_mktiocm(portp->asig.sigvalue);
        stli_mkasysigs(&portp->asig, 1, 1);
        if ((rc = stli_cmdwait(brdp, portp, A_SETSIGNALS, &portp->asig,
            sizeof(asysigs_t), 0)) < 0)
                return(rc);

        return(0);
}

/*****************************************************************************/

/*
 *      Send an open message to the slave. This will sleep waiting for the
 *      acknowledgement, so must have user context. We need to co-ordinate
 *      with close events here, since we don't want open and close events
 *      to overlap.
 */

static int stli_rawopen(stlibrd_t *brdp, stliport_t *portp, unsigned long arg, int wait)
{
        volatile cdkhdr_t       *hdrp;
        volatile cdkctrl_t      *cp;
        volatile unsigned char  *bits;
        unsigned long           flags;
        int                     rc;

#ifdef DEBUG
        printk("stli_rawopen(brdp=%x,portp=%x,arg=%x,wait=%d)\n",
                (int) brdp, (int) portp, (int) arg, wait);
#endif

/*
 *      Send a message to the slave to open this port.
 */
        save_flags(flags);
        cli();

/*
 *      Slave is already closing this port. This can happen if a hangup
 *      occurs on this port. So we must wait until it is complete. The
 *      order of opens and closes may not be preserved across shared
 *      memory, so we must wait until it is complete.
 */
        wait_event_interruptible(portp->raw_wait,
                        !test_bit(ST_CLOSING, &portp->state));
        if (signal_pending(current)) {
                restore_flags(flags);
                return -ERESTARTSYS;
        }

/*
 *      Everything is ready now, so write the open message into shared
 *      memory. Once the message is in set the service bits to say that
 *      this port wants service.
 */
        EBRDENABLE(brdp);
        cp = &((volatile cdkasy_t *) EBRDGETMEMPTR(brdp, portp->addr))->ctrl;
        cp->openarg = arg;
        cp->open = 1;
        hdrp = (volatile cdkhdr_t *) EBRDGETMEMPTR(brdp, CDK_CDKADDR);
        bits = ((volatile unsigned char *) hdrp) + brdp->slaveoffset +
                portp->portidx;
        *bits |= portp->portbit;
        EBRDDISABLE(brdp);

        if (wait == 0) {
                restore_flags(flags);
                return(0);
        }

/*
 *      Slave is in action, so now we must wait for the open acknowledgment
 *      to come back.
 */
        rc = 0;
        set_bit(ST_OPENING, &portp->state);
        wait_event_interruptible(portp->raw_wait,
                        !test_bit(ST_OPENING, &portp->state));
        if (signal_pending(current))
                rc = -ERESTARTSYS;
        restore_flags(flags);

        if ((rc == 0) && (portp->rc != 0))
                rc = -EIO;
        return(rc);
}

/*****************************************************************************/

/*
 *      Send a close message to the slave. Normally this will sleep waiting
 *      for the acknowledgement, but if wait parameter is 0 it will not. If
 *      wait is true then must have user context (to sleep).
 */

static int stli_rawclose(stlibrd_t *brdp, stliport_t *portp, unsigned long arg, int wait)
{
        volatile cdkhdr_t       *hdrp;
        volatile cdkctrl_t      *cp;
        volatile unsigned char  *bits;
        unsigned long           flags;
        int                     rc;

#ifdef DEBUG
        printk("stli_rawclose(brdp=%x,portp=%x,arg=%x,wait=%d)\n",
                (int) brdp, (int) portp, (int) arg, wait);
#endif

        save_flags(flags);
        cli();

/*
 *      Slave is already closing this port. This can happen if a hangup
 *      occurs on this port.
 */
        if (wait) {
                wait_event_interruptible(portp->raw_wait,
                                !test_bit(ST_CLOSING, &portp->state));
                if (signal_pending(current)) {
                        restore_flags(flags);
                        return -ERESTARTSYS;
                }
        }

/*
 *      Write the close command into shared memory.
 */
        EBRDENABLE(brdp);
        cp = &((volatile cdkasy_t *) EBRDGETMEMPTR(brdp, portp->addr))->ctrl;
        cp->closearg = arg;
        cp->close = 1;
        hdrp = (volatile cdkhdr_t *) EBRDGETMEMPTR(brdp, CDK_CDKADDR);
        bits = ((volatile unsigned char *) hdrp) + brdp->slaveoffset +
                portp->portidx;
        *bits |= portp->portbit;
        EBRDDISABLE(brdp);

        set_bit(ST_CLOSING, &portp->state);
        if (wait == 0) {
                restore_flags(flags);
                return(0);
        }

/*
 *      Slave is in action, so now we must wait for the open acknowledgment
 *      to come back.
 */
        rc = 0;
        wait_event_interruptible(portp->raw_wait,
                        !test_bit(ST_CLOSING, &portp->state));
        if (signal_pending(current))
                rc = -ERESTARTSYS;
        restore_flags(flags);

        if ((rc == 0) && (portp->rc != 0))
                rc = -EIO;
        return(rc);
}

/*****************************************************************************/

/*
 *      Send a command to the slave and wait for the response. This must
 *      have user context (it sleeps). This routine is generic in that it
 *      can send any type of command. Its purpose is to wait for that command
 *      to complete (as opposed to initiating the command then returning).
 */

static int stli_cmdwait(stlibrd_t *brdp, stliport_t *portp, unsigned long cmd, void *arg, int size, int copyback)
{
        unsigned long   flags;

#ifdef DEBUG
        printk("stli_cmdwait(brdp=%x,portp=%x,cmd=%x,arg=%x,size=%d,"
                "copyback=%d)\n", (int) brdp, (int) portp, (int) cmd,
                (int) arg, size, copyback);
#endif

        save_flags(flags);
        cli();
        wait_event_interruptible(portp->raw_wait,
                        !test_bit(ST_CMDING, &portp->state));
        if (signal_pending(current)) {
                restore_flags(flags);
                return -ERESTARTSYS;
        }

        stli_sendcmd(brdp, portp, cmd, arg, size, copyback);

        wait_event_interruptible(portp->raw_wait,
                        !test_bit(ST_CMDING, &portp->state));
        if (signal_pending(current)) {
                restore_flags(flags);
                return -ERESTARTSYS;
        }
        restore_flags(flags);

        if (portp->rc != 0)
                return(-EIO);
        return(0);
}

/*****************************************************************************/

/*
 *      Send the termios settings for this port to the slave. This sleeps
 *      waiting for the command to complete - so must have user context.
 */

static int stli_setport(stliport_t *portp)
{
        stlibrd_t       *brdp;
        asyport_t       aport;

#ifdef DEBUG
        printk("stli_setport(portp=%x)\n", (int) portp);
#endif

        if (portp == (stliport_t *) NULL)
                return(-ENODEV);
        if (portp->tty == (struct tty_struct *) NULL)
                return(-ENODEV);
        if ((portp->brdnr < 0) && (portp->brdnr >= stli_nrbrds))
                return(-ENODEV);
        brdp = stli_brds[portp->brdnr];
        if (brdp == (stlibrd_t *) NULL)
                return(-ENODEV);

        stli_mkasyport(portp, &aport, portp->tty->termios);
        return(stli_cmdwait(brdp, portp, A_SETPORT, &aport, sizeof(asyport_t), 0));
}

/*****************************************************************************/

/*
 *      Possibly need to wait for carrier (DCD signal) to come high. Say
 *      maybe because if we are clocal then we don't need to wait...
 */

static int stli_waitcarrier(stlibrd_t *brdp, stliport_t *portp, struct file *filp)
{
        unsigned long   flags;
        int             rc, doclocal;

#ifdef DEBUG
        printk("stli_waitcarrier(brdp=%x,portp=%x,filp=%x)\n",
                (int) brdp, (int) portp, (int) filp);
#endif

        rc = 0;
        doclocal = 0;

        if (portp->tty->termios->c_cflag & CLOCAL)
                doclocal++;

        save_flags(flags);
        cli();
        portp->openwaitcnt++;
        if (! tty_hung_up_p(filp))
                portp->refcount--;

        for (;;) {
                stli_mkasysigs(&portp->asig, 1, 1);
                if ((rc = stli_cmdwait(brdp, portp, A_SETSIGNALS,
                    &portp->asig, sizeof(asysigs_t), 0)) < 0)
                        break;
                if (tty_hung_up_p(filp) ||
                    ((portp->flags & ASYNC_INITIALIZED) == 0)) {
                        if (portp->flags & ASYNC_HUP_NOTIFY)
                                rc = -EBUSY;
                        else
                                rc = -ERESTARTSYS;
                        break;
                }
                if (((portp->flags & ASYNC_CLOSING) == 0) &&
                    (doclocal || (portp->sigs & TIOCM_CD))) {
                        break;
                }
                if (signal_pending(current)) {
                        rc = -ERESTARTSYS;
                        break;
                }
                interruptible_sleep_on(&portp->open_wait);
        }

        if (! tty_hung_up_p(filp))
                portp->refcount++;
        portp->openwaitcnt--;
        restore_flags(flags);

        return(rc);
}

/*****************************************************************************/

/*
 *      Write routine. Take the data and put it in the shared memory ring
 *      queue. If port is not already sending chars then need to mark the
 *      service bits for this port.
 */

static int stli_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
        volatile cdkasy_t       *ap;
        volatile cdkhdr_t       *hdrp;
        volatile unsigned char  *bits;
        unsigned char           *shbuf, *chbuf;
        stliport_t              *portp;
        stlibrd_t               *brdp;
        unsigned int            len, stlen, head, tail, size;
        unsigned long           flags;

#ifdef DEBUG
        printk("stli_write(tty=%x,buf=%x,count=%d)\n",
                (int) tty, (int) buf, count);
#endif

        if ((tty == (struct tty_struct *) NULL) ||
            (stli_tmpwritebuf == (char *) NULL))
                return(0);
        if (tty == stli_txcooktty)
                stli_flushchars(tty);
        portp = tty->driver_data;
        if (portp == (stliport_t *) NULL)
                return(0);
        if ((portp->brdnr < 0) || (portp->brdnr >= stli_nrbrds))
                return(0);
        brdp = stli_brds[portp->brdnr];
        if (brdp == (stlibrd_t *) NULL)
                return(0);
        chbuf = (unsigned char *) buf;

/*
 *      All data is now local, shove as much as possible into shared memory.
 */
        save_flags(flags);
        cli();
        EBRDENABLE(brdp);
        ap = (volatile cdkasy_t *) EBRDGETMEMPTR(brdp, portp->addr);
        head = (unsigned int) ap->txq.head;
        tail = (unsigned int) ap->txq.tail;
        if (tail != ((unsigned int) ap->txq.tail))
                tail = (unsigned int) ap->txq.tail;
        size = portp->txsize;
        if (head >= tail) {
                len = size - (head - tail) - 1;
                stlen = size - head;
        } else {
                len = tail - head - 1;
                stlen = len;
        }

        len = MIN(len, count);
        count = 0;
        shbuf = (char *) EBRDGETMEMPTR(brdp, portp->txoffset);

        while (len > 0) {
                stlen = MIN(len, stlen);
                memcpy((shbuf + head), chbuf, stlen);
                chbuf += stlen;
                len -= stlen;
                count += stlen;
                head += stlen;
                if (head >= size) {
                        head = 0;
                        stlen = tail;
                }
        }

        ap = (volatile cdkasy_t *) EBRDGETMEMPTR(brdp, portp->addr);
        ap->txq.head = head;
        if (test_bit(ST_TXBUSY, &portp->state)) {
                if (ap->changed.data & DT_TXEMPTY)
                        ap->changed.data &= ~DT_TXEMPTY;
        }
        hdrp = (volatile cdkhdr_t *) EBRDGETMEMPTR(brdp, CDK_CDKADDR);
        bits = ((volatile unsigned char *) hdrp) + brdp->slaveoffset +
                portp->portidx;
        *bits |= portp->portbit;
        set_bit(ST_TXBUSY, &portp->state);
        EBRDDISABLE(brdp);

        restore_flags(flags);

        return(count);
}

/*****************************************************************************/

/*
 *      Output a single character. We put it into a temporary local buffer
 *      (for speed) then write out that buffer when the flushchars routine
 *      is called. There is a safety catch here so that if some other port
 *      writes chars before the current buffer has been, then we write them
 *      first them do the new ports.
 */

static void stli_putchar(struct tty_struct *tty, unsigned char ch)
{
#ifdef DEBUG
        printk("stli_putchar(tty=%x,ch=%x)\n", (int) tty, (int) ch);
#endif

        if (tty == (struct tty_struct *) NULL)
                return;
        if (tty != stli_txcooktty) {
                if (stli_txcooktty != (struct tty_struct *) NULL)
                        stli_flushchars(stli_txcooktty);
                stli_txcooktty = tty;
        }

        stli_txcookbuf[stli_txcooksize++] = ch;
}

/*****************************************************************************/

/*
 *      Transfer characters from the local TX cooking buffer to the board.
 *      We sort of ignore the tty that gets passed in here. We rely on the
 *      info stored with the TX cook buffer to tell us which port to flush
 *      the data on. In any case we clean out the TX cook buffer, for re-use
 *      by someone else.
 */

static void stli_flushchars(struct tty_struct *tty)
{
        volatile cdkhdr_t       *hdrp;
        volatile unsigned char  *bits;
        volatile cdkasy_t       *ap;
        struct tty_struct       *cooktty;
        stliport_t              *portp;
        stlibrd_t               *brdp;
        unsigned int            len, stlen, head, tail, size, count, cooksize;
        unsigned char           *buf, *shbuf;
        unsigned long           flags;

#ifdef DEBUG
        printk("stli_flushchars(tty=%x)\n", (int) tty);
#endif

        cooksize = stli_txcooksize;
        cooktty = stli_txcooktty;
        stli_txcooksize = 0;
        stli_txcookrealsize = 0;
        stli_txcooktty = (struct tty_struct *) NULL;

        if (tty == (struct tty_struct *) NULL)
                return;
        if (cooktty == (struct tty_struct *) NULL)
                return;
        if (tty != cooktty)
                tty = cooktty;
        if (cooksize == 0)
                return;

        portp = tty->driver_data;
        if (portp == (stliport_t *) NULL)
                return;
        if ((portp->brdnr < 0) || (portp->brdnr >= stli_nrbrds))
                return;
        brdp = stli_brds[portp->brdnr];
        if (brdp == (stlibrd_t *) NULL)
                return;

        save_flags(flags);
        cli();
        EBRDENABLE(brdp);

        ap = (volatile cdkasy_t *) EBRDGETMEMPTR(brdp, portp->addr);
        head = (unsigned int) ap->txq.head;
        tail = (unsigned int) ap->txq.tail;
        if (tail != ((unsigned int) ap->txq.tail))
                tail = (unsigned int) ap->txq.tail;
        size = portp->txsize;
        if (head >= tail) {
                len = size - (head - tail) - 1;
                stlen = size - head;
        } else {
                len = tail - head - 1;
                stlen = len;
        }

        len = MIN(len, cooksize);
        count = 0;
        shbuf = (char *) EBRDGETMEMPTR(brdp, portp->txoffset);
        buf = stli_txcookbuf;

        while (len > 0) {
                stlen = MIN(len, stlen);
                memcpy((shbuf + head), buf, stlen);
                buf += stlen;
                len -= stlen;
                count += stlen;
                head += stlen;
                if (head >= size) {
                        head = 0;
                        stlen = tail;
                }
        }

        ap = (volatile cdkasy_t *) EBRDGETMEMPTR(brdp, portp->addr);
        ap->txq.head = head;

        if (test_bit(ST_TXBUSY, &portp->state)) {
                if (ap->changed.data & DT_TXEMPTY)
                        ap->changed.data &= ~DT_TXEMPTY;
        }
        hdrp = (volatile cdkhdr_t *) EBRDGETMEMPTR(brdp, CDK_CDKADDR);
        bits = ((volatile unsigned char *) hdrp) + brdp->slaveoffset +
                portp->portidx;
        *bits |= portp->portbit;
        set_bit(ST_TXBUSY, &portp->state);

        EBRDDISABLE(brdp);
        restore_flags(flags);
}

/*****************************************************************************/

static int stli_writeroom(struct tty_struct *tty)
{
        volatile cdkasyrq_t     *rp;
        stliport_t              *portp;
        stlibrd_t               *brdp;
        unsigned int            head, tail, len;
        unsigned long           flags;

#ifdef DEBUG
        printk("stli_writeroom(tty=%x)\n", (int) tty);
#endif

        if (tty == (struct tty_struct *) NULL)
                return(0);
        if (tty == stli_txcooktty) {
                if (stli_txcookrealsize != 0) {
                        len = stli_txcookrealsize - stli_txcooksize;
                        return(len);
                }
        }

        portp = tty->driver_data;
        if (portp == (stliport_t *) NULL)
                return(0);
        if ((portp->brdnr < 0) || (portp->brdnr >= stli_nrbrds))
                return(0);
        brdp = stli_brds[portp->brdnr];
        if (brdp == (stlibrd_t *) NULL)
                return(0);

        save_flags(flags);
        cli();
        EBRDENABLE(brdp);
        rp = &((volatile cdkasy_t *) EBRDGETMEMPTR(brdp, portp->addr))->txq;
        head = (unsigned int) rp->head;
        tail = (unsigned int) rp->tail;
        if (tail != ((unsigned int) rp->tail))
                tail = (unsigned int) rp->tail;
        len = (head >= tail) ? (portp->txsize - (head - tail)) : (tail - head);
        len--;
        EBRDDISABLE(brdp);
        restore_flags(flags);

        if (tty == stli_txcooktty) {
                stli_txcookrealsize = len;
                len -= stli_txcooksize;
        }
        return(len);
}

/*****************************************************************************/

/*
 *      Return the number of characters in the transmit buffer. Normally we
 *      will return the number of chars in the shared memory ring queue.
 *      We need to kludge around the case where the shared memory buffer is
 *      empty but not all characters have drained yet, for this case just
 *      return that there is 1 character in the buffer!
 */

static int stli_charsinbuffer(struct tty_struct *tty)
{
        volatile cdkasyrq_t     *rp;
        stliport_t              *portp;
        stlibrd_t               *brdp;
        unsigned int            head, tail, len;
        unsigned long           flags;

#ifdef DEBUG
        printk("stli_charsinbuffer(tty=%x)\n", (int) tty);
#endif

        if (tty == (struct tty_struct *) NULL)
                return(0);
        if (tty == stli_txcooktty)
                stli_flushchars(tty);
        portp = tty->driver_data;
        if (portp == (stliport_t *) NULL)
                return(0);
        if ((portp->brdnr < 0) || (portp->brdnr >= stli_nrbrds))
                return(0);
        brdp = stli_brds[portp->brdnr];
        if (brdp == (stlibrd_t *) NULL)
                return(0);

        save_flags(flags);
        cli();
        EBRDENABLE(brdp);
        rp = &((volatile cdkasy_t *) EBRDGETMEMPTR(brdp, portp->addr))->txq;
        head = (unsigned int) rp->head;
        tail = (unsigned int) rp->tail;
        if (tail != ((unsigned int) rp->tail))
                tail = (unsigned int) rp->tail;
        len = (head >= tail) ? (head - tail) : (portp->txsize - (tail - head));
        if ((len == 0) && test_bit(ST_TXBUSY, &portp->state))
                len = 1;
        EBRDDISABLE(brdp);
        restore_flags(flags);

        return(len);
}

/*****************************************************************************/

/*
 *      Generate the serial struct info.
 */

static int stli_getserial(stliport_t *portp, struct serial_struct __user *sp)
{
        struct serial_struct    sio;
        stlibrd_t               *brdp;

#ifdef DEBUG
        printk("stli_getserial(portp=%x,sp=%x)\n", (int) portp, (int) sp);
#endif

        memset(&sio, 0, sizeof(struct serial_struct));
        sio.type = PORT_UNKNOWN;
        sio.line = portp->portnr;
        sio.irq = 0;
        sio.flags = portp->flags;
        sio.baud_base = portp->baud_base;
        sio.close_delay = portp->close_delay;
        sio.closing_wait = portp->closing_wait;
        sio.custom_divisor = portp->custom_divisor;
        sio.xmit_fifo_size = 0;
        sio.hub6 = 0;

        brdp = stli_brds[portp->brdnr];
        if (brdp != (stlibrd_t *) NULL)
                sio.port = brdp->iobase;
                
        return copy_to_user(sp, &sio, sizeof(struct serial_struct)) ?
                        -EFAULT : 0;
}

/*****************************************************************************/

/*
 *      Set port according to the serial struct info.
 *      At this point we do not do any auto-configure stuff, so we will
 *      just quietly ignore any requests to change irq, etc.
 */

static int stli_setserial(stliport_t *portp, struct serial_struct __user *sp)
{
        struct serial_struct    sio;
        int                     rc;

#ifdef DEBUG
        printk("stli_setserial(portp=%p,sp=%p)\n", portp, sp);
#endif

        if (copy_from_user(&sio, sp, sizeof(struct serial_struct)))
                return -EFAULT;
        if (!capable(CAP_SYS_ADMIN)) {
                if ((sio.baud_base != portp->baud_base) ||
                    (sio.close_delay != portp->close_delay) ||
                    ((sio.flags & ~ASYNC_USR_MASK) !=
                    (portp->flags & ~ASYNC_USR_MASK)))
                        return(-EPERM);
        } 

        portp->flags = (portp->flags & ~ASYNC_USR_MASK) |
                (sio.flags & ASYNC_USR_MASK);
        portp->baud_base = sio.baud_base;
        portp->close_delay = sio.close_delay;
        portp->closing_wait = sio.closing_wait;
        portp->custom_divisor = sio.custom_divisor;

        if ((rc = stli_setport(portp)) < 0)
                return(rc);
        return(0);
}

/*****************************************************************************/

static int stli_tiocmget(struct tty_struct *tty, struct file *file)
{
        stliport_t *portp = tty->driver_data;
        stlibrd_t *brdp;
        int rc;

        if (portp == (stliport_t *) NULL)
                return(-ENODEV);
        if ((portp->brdnr < 0) || (portp->brdnr >= stli_nrbrds))
                return(0);
        brdp = stli_brds[portp->brdnr];
        if (brdp == (stlibrd_t *) NULL)
                return(0);
        if (tty->flags & (1 << TTY_IO_ERROR))
                return(-EIO);

        if ((rc = stli_cmdwait(brdp, portp, A_GETSIGNALS,
                               &portp->asig, sizeof(asysigs_t), 1)) < 0)
                return(rc);

        return stli_mktiocm(portp->asig.sigvalue);
}

static int stli_tiocmset(struct tty_struct *tty, struct file *file,
                         unsigned int set, unsigned int clear)
{
        stliport_t *portp = tty->driver_data;
        stlibrd_t *brdp;
        int rts = -1, dtr = -1;

        if (portp == (stliport_t *) NULL)
                return(-ENODEV);
        if ((portp->brdnr < 0) || (portp->brdnr >= stli_nrbrds))
                return(0);
        brdp = stli_brds[portp->brdnr];
        if (brdp == (stlibrd_t *) NULL)
                return(0);
        if (tty->flags & (1 << TTY_IO_ERROR))
                return(-EIO);

        if (set & TIOCM_RTS)
                rts = 1;
        if (set & TIOCM_DTR)
                dtr = 1;
        if (clear & TIOCM_RTS)
                rts = 0;
        if (clear & TIOCM_DTR)
                dtr = 0;

        stli_mkasysigs(&portp->asig, dtr, rts);

        return stli_cmdwait(brdp, portp, A_SETSIGNALS, &portp->asig,
                            sizeof(asysigs_t), 0);
}

static int stli_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
{
        stliport_t      *portp;
        stlibrd_t       *brdp;
        unsigned int    ival;
        int             rc;
        void __user *argp = (void __user *)arg;

#ifdef DEBUG
        printk("stli_ioctl(tty=%x,file=%x,cmd=%x,arg=%x)\n",
                (int) tty, (int) file, cmd, (int) arg);
#endif

        if (tty == (struct tty_struct *) NULL)
                return(-ENODEV);
        portp = tty->driver_data;
        if (portp == (stliport_t *) NULL)
                return(-ENODEV);
        if ((portp->brdnr < 0) || (portp->brdnr >= stli_nrbrds))
                return(0);
        brdp = stli_brds[portp->brdnr];
        if (brdp == (stlibrd_t *) NULL)
                return(0);

        if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
            (cmd != COM_GETPORTSTATS) && (cmd != COM_CLRPORTSTATS)) {
                if (tty->flags & (1 << TTY_IO_ERROR))
                        return(-EIO);
        }

        rc = 0;

        switch (cmd) {
        case TIOCGSOFTCAR:
                rc = put_user(((tty->termios->c_cflag & CLOCAL) ? 1 : 0),
                        (unsigned __user *) arg);
                break;
        case TIOCSSOFTCAR:
                if ((rc = get_user(ival, (unsigned __user *) arg)) == 0)
                        tty->termios->c_cflag =
                                (tty->termios->c_cflag & ~CLOCAL) |
                                (ival ? CLOCAL : 0);
                break;
        case TIOCGSERIAL:
                rc = stli_getserial(portp, argp);
                break;
        case TIOCSSERIAL:
                rc = stli_setserial(portp, argp);
                break;
        case STL_GETPFLAG:
                rc = put_user(portp->pflag, (unsigned __user *)argp);
                break;
        case STL_SETPFLAG:
                if ((rc = get_user(portp->pflag, (unsigned __user *)argp)) == 0)
                        stli_setport(portp);
                break;
        case COM_GETPORTSTATS:
                rc = stli_getportstats(portp, argp);
                break;
        case COM_CLRPORTSTATS:
                rc = stli_clrportstats(portp, argp);
                break;
        case TIOCSERCONFIG:
        case TIOCSERGWILD:
        case TIOCSERSWILD:
        case TIOCSERGETLSR:
        case TIOCSERGSTRUCT:
        case TIOCSERGETMULTI:
        case TIOCSERSETMULTI:
        default:
                rc = -ENOIOCTLCMD;
                break;
        }

        return(rc);
}

/*****************************************************************************/

/*
 *      This routine assumes that we have user context and can sleep.
 *      Looks like it is true for the current ttys implementation..!!
 */

static void stli_settermios(struct tty_struct *tty, struct termios *old)
{
        stliport_t      *portp;
        stlibrd_t       *brdp;
        struct termios  *tiosp;
        asyport_t       aport;

#ifdef DEBUG
        printk("stli_settermios(tty=%x,old=%x)\n", (int) tty, (int) old);
#endif

        if (tty == (struct tty_struct *) NULL)
                return;
        portp = tty->driver_data;
        if (portp == (stliport_t *) NULL)
                return;
        if ((portp->brdnr < 0) || (portp->brdnr >= stli_nrbrds))
                return;
        brdp = stli_brds[portp->brdnr];
        if (brdp == (stlibrd_t *) NULL)
                return;

        tiosp = tty->termios;
        if ((tiosp->c_cflag == old->c_cflag) &&
            (tiosp->c_iflag == old->c_iflag))
                return;

        stli_mkasyport(portp, &aport, tiosp);
        stli_cmdwait(brdp, portp, A_SETPORT, &aport, sizeof(asyport_t), 0);
        stli_mkasysigs(&portp->asig, ((tiosp->c_cflag & CBAUD) ? 1 : 0), -1);
        stli_cmdwait(brdp, portp, A_SETSIGNALS, &portp->asig,
                sizeof(asysigs_t), 0);
        if ((old->c_cflag & CRTSCTS) && ((tiosp->c_cflag & CRTSCTS) == 0))
                tty->hw_stopped = 0;
        if (((old->c_cflag & CLOCAL) == 0) && (tiosp->c_cflag & CLOCAL))
                wake_up_interruptible(&portp->open_wait);
}

/*****************************************************************************/

/*
 *      Attempt to flow control who ever is sending us data. We won't really
 *      do any flow control action here. We can't directly, and even if we
 *      wanted to we would have to send a command to the slave. The slave
 *      knows how to flow control, and will do so when its buffers reach its
 *      internal high water marks. So what we will do is set a local state
 *      bit that will stop us sending any RX data up from the poll routine
 *      (which is the place where RX data from the slave is handled).
 */

static void stli_throttle(struct tty_struct *tty)
{
        stliport_t      *portp;

#ifdef DEBUG
        printk("stli_throttle(tty=%x)\n", (int) tty);
#endif

        if (tty == (struct tty_struct *) NULL)
                return;
        portp = tty->driver_data;
        if (portp == (stliport_t *) NULL)
                return;

        set_bit(ST_RXSTOP, &portp->state);
}

/*****************************************************************************/

/*
 *      Unflow control the device sending us data... That means that all
 *      we have to do is clear the RXSTOP state bit. The next poll call
 *      will then be able to pass the RX data back up.
 */

static void stli_unthrottle(struct tty_struct *tty)
{
        stliport_t      *portp;

#ifdef DEBUG
        printk("stli_unthrottle(tty=%x)\n", (int) tty);
#endif

        if (tty == (struct tty_struct *) NULL)
                return;
        portp = tty->driver_data;
        if (portp == (stliport_t *) NULL)
                return;

        clear_bit(ST_RXSTOP, &portp->state);
}

/*****************************************************************************/

/*
 *      Stop the transmitter. Basically to do this we will just turn TX
 *      interrupts off.
 */

static void stli_stop(struct tty_struct *tty)
{
        stlibrd_t       *brdp;
        stliport_t      *portp;
        asyctrl_t       actrl;

#ifdef DEBUG
        printk("stli_stop(tty=%x)\n", (int) tty);
#endif

        if (tty == (struct tty_struct *) NULL)
                return;
        portp = tty->driver_data;
        if (portp == (stliport_t *) NULL)
                return;
        if ((portp->brdnr < 0) || (portp->brdnr >= stli_nrbrds))
                return;
        brdp = stli_brds[portp->brdnr];
        if (brdp == (stlibrd_t *) NULL)
                return;

        memset(&actrl, 0, sizeof(asyctrl_t));
        actrl.txctrl = CT_STOPFLOW;
#if 0
        stli_cmdwait(brdp, portp, A_PORTCTRL, &actrl, sizeof(asyctrl_t), 0);
#endif
}

/*****************************************************************************/

/*
 *      Start the transmitter again. Just turn TX interrupts back on.
 */

static void stli_start(struct tty_struct *tty)
{
        stliport_t      *portp;
        stlibrd_t       *brdp;
        asyctrl_t       actrl;

#ifdef DEBUG
        printk("stli_start(tty=%x)\n", (int) tty);
#endif

        if (tty == (struct tty_struct *) NULL)
                return;
        portp = tty->driver_data;
        if (portp == (stliport_t *) NULL)
                return;
        if ((portp->brdnr < 0) || (portp->brdnr >= stli_nrbrds))
                return;
        brdp = stli_brds[portp->brdnr];
        if (brdp == (stlibrd_t *) NULL)
                return;

        memset(&actrl, 0, sizeof(asyctrl_t));
        actrl.txctrl = CT_STARTFLOW;
#if 0
        stli_cmdwait(brdp, portp, A_PORTCTRL, &actrl, sizeof(asyctrl_t), 0);
#endif
}

/*****************************************************************************/

/*
 *      Scheduler called hang up routine. This is called from the scheduler,
 *      not direct from the driver "poll" routine. We can't call it there
 *      since the real local hangup code will enable/disable the board and
 *      other things that we can't do while handling the poll. Much easier
 *      to deal with it some time later (don't really care when, hangups
 *      aren't that time critical).
 */

static void stli_dohangup(void *arg)
{
        stliport_t      *portp;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_dohangup(portp=%x)\n", (int) arg);
#endif

        /*
         * FIXME: There's a module removal race here: tty_hangup
         * calls schedule_work which will call into this
         * driver later.
         */
        portp = (stliport_t *) arg;
        if (portp != (stliport_t *) NULL) {
                if (portp->tty != (struct tty_struct *) NULL) {
                        tty_hangup(portp->tty);
                }
        }
}

/*****************************************************************************/

/*
 *      Hangup this port. This is pretty much like closing the port, only
 *      a little more brutal. No waiting for data to drain. Shutdown the
 *      port and maybe drop signals. This is rather tricky really. We want
 *      to close the port as well.
 */

static void stli_hangup(struct tty_struct *tty)
{
        stliport_t      *portp;
        stlibrd_t       *brdp;
        unsigned long   flags;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_hangup(tty=%x)\n", (int) tty);
#endif

        if (tty == (struct tty_struct *) NULL)
                return;
        portp = tty->driver_data;
        if (portp == (stliport_t *) NULL)
                return;
        if ((portp->brdnr < 0) || (portp->brdnr >= stli_nrbrds))
                return;
        brdp = stli_brds[portp->brdnr];
        if (brdp == (stlibrd_t *) NULL)
                return;

        portp->flags &= ~ASYNC_INITIALIZED;

        save_flags(flags);
        cli();
        if (! test_bit(ST_CLOSING, &portp->state))
                stli_rawclose(brdp, portp, 0, 0);
        if (tty->termios->c_cflag & HUPCL) {
                stli_mkasysigs(&portp->asig, 0, 0);
                if (test_bit(ST_CMDING, &portp->state)) {
                        set_bit(ST_DOSIGS, &portp->state);
                        set_bit(ST_DOFLUSHTX, &portp->state);
                        set_bit(ST_DOFLUSHRX, &portp->state);
                } else {
                        stli_sendcmd(brdp, portp, A_SETSIGNALSF,
                                &portp->asig, sizeof(asysigs_t), 0);
                }
        }
        restore_flags(flags);

        clear_bit(ST_TXBUSY, &portp->state);
        clear_bit(ST_RXSTOP, &portp->state);
        set_bit(TTY_IO_ERROR, &tty->flags);
        portp->tty = (struct tty_struct *) NULL;
        portp->flags &= ~ASYNC_NORMAL_ACTIVE;
        portp->refcount = 0;
        wake_up_interruptible(&portp->open_wait);
}

/*****************************************************************************/

/*
 *      Flush characters from the lower buffer. We may not have user context
 *      so we cannot sleep waiting for it to complete. Also we need to check
 *      if there is chars for this port in the TX cook buffer, and flush them
 *      as well.
 */

static void stli_flushbuffer(struct tty_struct *tty)
{
        stliport_t      *portp;
        stlibrd_t       *brdp;
        unsigned long   ftype, flags;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_flushbuffer(tty=%x)\n", (int) tty);
#endif

        if (tty == (struct tty_struct *) NULL)
                return;
        portp = tty->driver_data;
        if (portp == (stliport_t *) NULL)
                return;
        if ((portp->brdnr < 0) || (portp->brdnr >= stli_nrbrds))
                return;
        brdp = stli_brds[portp->brdnr];
        if (brdp == (stlibrd_t *) NULL)
                return;

        save_flags(flags);
        cli();
        if (tty == stli_txcooktty) {
                stli_txcooktty = (struct tty_struct *) NULL;
                stli_txcooksize = 0;
                stli_txcookrealsize = 0;
        }
        if (test_bit(ST_CMDING, &portp->state)) {
                set_bit(ST_DOFLUSHTX, &portp->state);
        } else {
                ftype = FLUSHTX;
                if (test_bit(ST_DOFLUSHRX, &portp->state)) {
                        ftype |= FLUSHRX;
                        clear_bit(ST_DOFLUSHRX, &portp->state);
                }
                stli_sendcmd(brdp, portp, A_FLUSH, &ftype,
                        sizeof(unsigned long), 0);
        }
        restore_flags(flags);

        wake_up_interruptible(&tty->write_wait);
        if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
            tty->ldisc.write_wakeup)
                (tty->ldisc.write_wakeup)(tty);
}

/*****************************************************************************/

static void stli_breakctl(struct tty_struct *tty, int state)
{
        stlibrd_t       *brdp;
        stliport_t      *portp;
        long            arg;
        /* long savestate, savetime; */

#ifdef DEBUG
        printk(KERN_DEBUG "stli_breakctl(tty=%x,state=%d)\n", (int) tty, state);
#endif

        if (tty == (struct tty_struct *) NULL)
                return;
        portp = tty->driver_data;
        if (portp == (stliport_t *) NULL)
                return;
        if ((portp->brdnr < 0) || (portp->brdnr >= stli_nrbrds))
                return;
        brdp = stli_brds[portp->brdnr];
        if (brdp == (stlibrd_t *) NULL)
                return;

/*
 *      Due to a bug in the tty send_break() code we need to preserve
 *      the current process state and timeout...
        savetime = current->timeout;
        savestate = current->state;
 */

        arg = (state == -1) ? BREAKON : BREAKOFF;
        stli_cmdwait(brdp, portp, A_BREAK, &arg, sizeof(long), 0);

/*
 *
        current->timeout = savetime;
        current->state = savestate;
 */
}

/*****************************************************************************/

static void stli_waituntilsent(struct tty_struct *tty, int timeout)
{
        stliport_t      *portp;
        unsigned long   tend;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_waituntilsent(tty=%x,timeout=%x)\n", (int) tty, timeout);
#endif

        if (tty == (struct tty_struct *) NULL)
                return;
        portp = tty->driver_data;
        if (portp == (stliport_t *) NULL)
                return;

        if (timeout == 0)
                timeout = HZ;
        tend = jiffies + timeout;

        while (test_bit(ST_TXBUSY, &portp->state)) {
                if (signal_pending(current))
                        break;
                msleep_interruptible(20);
                if (time_after_eq(jiffies, tend))
                        break;
        }
}

/*****************************************************************************/

static void stli_sendxchar(struct tty_struct *tty, char ch)
{
        stlibrd_t       *brdp;
        stliport_t      *portp;
        asyctrl_t       actrl;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_sendxchar(tty=%x,ch=%x)\n", (int) tty, ch);
#endif

        if (tty == (struct tty_struct *) NULL)
                return;
        portp = tty->driver_data;
        if (portp == (stliport_t *) NULL)
                return;
        if ((portp->brdnr < 0) || (portp->brdnr >= stli_nrbrds))
                return;
        brdp = stli_brds[portp->brdnr];
        if (brdp == (stlibrd_t *) NULL)
                return;

        memset(&actrl, 0, sizeof(asyctrl_t));
        if (ch == STOP_CHAR(tty)) {
                actrl.rxctrl = CT_STOPFLOW;
        } else if (ch == START_CHAR(tty)) {
                actrl.rxctrl = CT_STARTFLOW;
        } else {
                actrl.txctrl = CT_SENDCHR;
                actrl.tximdch = ch;
        }

        stli_cmdwait(brdp, portp, A_PORTCTRL, &actrl, sizeof(asyctrl_t), 0);
}

/*****************************************************************************/

#define MAXLINE         80

/*
 *      Format info for a specified port. The line is deliberately limited
 *      to 80 characters. (If it is too long it will be truncated, if too
 *      short then padded with spaces).
 */

static int stli_portinfo(stlibrd_t *brdp, stliport_t *portp, int portnr, char *pos)
{
        char    *sp, *uart;
        int     rc, cnt;

        rc = stli_portcmdstats(portp);

        uart = "UNKNOWN";
        if (brdp->state & BST_STARTED) {
                switch (stli_comstats.hwid) {
                case 0:         uart = "2681"; break;
                case 1:         uart = "SC26198"; break;
                default:        uart = "CD1400"; break;
                }
        }

        sp = pos;
        sp += sprintf(sp, "%d: uart:%s ", portnr, uart);

        if ((brdp->state & BST_STARTED) && (rc >= 0)) {
                sp += sprintf(sp, "tx:%d rx:%d", (int) stli_comstats.txtotal,
                        (int) stli_comstats.rxtotal);

                if (stli_comstats.rxframing)
                        sp += sprintf(sp, " fe:%d",
                                (int) stli_comstats.rxframing);
                if (stli_comstats.rxparity)
                        sp += sprintf(sp, " pe:%d",
                                (int) stli_comstats.rxparity);
                if (stli_comstats.rxbreaks)
                        sp += sprintf(sp, " brk:%d",
                                (int) stli_comstats.rxbreaks);
                if (stli_comstats.rxoverrun)
                        sp += sprintf(sp, " oe:%d",
                                (int) stli_comstats.rxoverrun);

                cnt = sprintf(sp, "%s%s%s%s%s ",
                        (stli_comstats.signals & TIOCM_RTS) ? "|RTS" : "",
                        (stli_comstats.signals & TIOCM_CTS) ? "|CTS" : "",
                        (stli_comstats.signals & TIOCM_DTR) ? "|DTR" : "",
                        (stli_comstats.signals & TIOCM_CD) ? "|DCD" : "",
                        (stli_comstats.signals & TIOCM_DSR) ? "|DSR" : "");
                *sp = ' ';
                sp += cnt;
        }

        for (cnt = (sp - pos); (cnt < (MAXLINE - 1)); cnt++)
                *sp++ = ' ';
        if (cnt >= MAXLINE)
                pos[(MAXLINE - 2)] = '+';
        pos[(MAXLINE - 1)] = '\n';

        return(MAXLINE);
}

/*****************************************************************************/

/*
 *      Port info, read from the /proc file system.
 */

static int stli_readproc(char *page, char **start, off_t off, int count, int *eof, void *data)
{
        stlibrd_t       *brdp;
        stliport_t      *portp;
        int             brdnr, portnr, totalport;
        int             curoff, maxoff;
        char            *pos;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_readproc(page=%x,start=%x,off=%x,count=%d,eof=%x,"
                "data=%x\n", (int) page, (int) start, (int) off, count,
                (int) eof, (int) data);
#endif

        pos = page;
        totalport = 0;
        curoff = 0;

        if (off == 0) {
                pos += sprintf(pos, "%s: version %s", stli_drvtitle,
                        stli_drvversion);
                while (pos < (page + MAXLINE - 1))
                        *pos++ = ' ';
                *pos++ = '\n';
        }
        curoff =  MAXLINE;

/*
 *      We scan through for each board, panel and port. The offset is
 *      calculated on the fly, and irrelevant ports are skipped.
 */
        for (brdnr = 0; (brdnr < stli_nrbrds); brdnr++) {
                brdp = stli_brds[brdnr];
                if (brdp == (stlibrd_t *) NULL)
                        continue;
                if (brdp->state == 0)
                        continue;

                maxoff = curoff + (brdp->nrports * MAXLINE);
                if (off >= maxoff) {
                        curoff = maxoff;
                        continue;
                }

                totalport = brdnr * STL_MAXPORTS;
                for (portnr = 0; (portnr < brdp->nrports); portnr++,
                    totalport++) {
                        portp = brdp->ports[portnr];
                        if (portp == (stliport_t *) NULL)
                                continue;
                        if (off >= (curoff += MAXLINE))
                                continue;
                        if ((pos - page + MAXLINE) > count)
                                goto stli_readdone;
                        pos += stli_portinfo(brdp, portp, totalport, pos);
                }
        }

        *eof = 1;

stli_readdone:
        *start = page;
        return(pos - page);
}

/*****************************************************************************/

/*
 *      Generic send command routine. This will send a message to the slave,
 *      of the specified type with the specified argument. Must be very
 *      careful of data that will be copied out from shared memory -
 *      containing command results. The command completion is all done from
 *      a poll routine that does not have user context. Therefore you cannot
 *      copy back directly into user space, or to the kernel stack of a
 *      process. This routine does not sleep, so can be called from anywhere.
 */

static void stli_sendcmd(stlibrd_t *brdp, stliport_t *portp, unsigned long cmd, void *arg, int size, int copyback)
{
        volatile cdkhdr_t       *hdrp;
        volatile cdkctrl_t      *cp;
        volatile unsigned char  *bits;
        unsigned long           flags;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_sendcmd(brdp=%x,portp=%x,cmd=%x,arg=%x,size=%d,"
                "copyback=%d)\n", (int) brdp, (int) portp, (int) cmd,
                (int) arg, size, copyback);
#endif

        save_flags(flags);
        cli();

        if (test_bit(ST_CMDING, &portp->state)) {
                printk(KERN_ERR "STALLION: command already busy, cmd=%x!\n",
                                (int) cmd);
                restore_flags(flags);
                return;
        }

        EBRDENABLE(brdp);
        cp = &((volatile cdkasy_t *) EBRDGETMEMPTR(brdp, portp->addr))->ctrl;
        if (size > 0) {
                memcpy((void *) &(cp->args[0]), arg, size);
                if (copyback) {
                        portp->argp = arg;
                        portp->argsize = size;
                }
        }
        cp->status = 0;
        cp->cmd = cmd;
        hdrp = (volatile cdkhdr_t *) EBRDGETMEMPTR(brdp, CDK_CDKADDR);
        bits = ((volatile unsigned char *) hdrp) + brdp->slaveoffset +
                portp->portidx;
        *bits |= portp->portbit;
        set_bit(ST_CMDING, &portp->state);
        EBRDDISABLE(brdp);
        restore_flags(flags);
}

/*****************************************************************************/

/*
 *      Read data from shared memory. This assumes that the shared memory
 *      is enabled and that interrupts are off. Basically we just empty out
 *      the shared memory buffer into the tty buffer. Must be careful to
 *      handle the case where we fill up the tty buffer, but still have
 *      more chars to unload.
 */

static void stli_read(stlibrd_t *brdp, stliport_t *portp)
{
        volatile cdkasyrq_t     *rp;
        volatile char           *shbuf;
        struct tty_struct       *tty;
        unsigned int            head, tail, size;
        unsigned int            len, stlen;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_read(brdp=%x,portp=%d)\n",
                        (int) brdp, (int) portp);
#endif

        if (test_bit(ST_RXSTOP, &portp->state))
                return;
        tty = portp->tty;
        if (tty == (struct tty_struct *) NULL)
                return;

        rp = &((volatile cdkasy_t *) EBRDGETMEMPTR(brdp, portp->addr))->rxq;
        head = (unsigned int) rp->head;
        if (head != ((unsigned int) rp->head))
                head = (unsigned int) rp->head;
        tail = (unsigned int) rp->tail;
        size = portp->rxsize;
        if (head >= tail) {
                len = head - tail;
                stlen = len;
        } else {
                len = size - (tail - head);
                stlen = size - tail;
        }

        len = MIN(len, (TTY_FLIPBUF_SIZE - tty->flip.count));
        shbuf = (volatile char *) EBRDGETMEMPTR(brdp, portp->rxoffset);

        while (len > 0) {
                stlen = MIN(len, stlen);
                memcpy(tty->flip.char_buf_ptr, (char *) (shbuf + tail), stlen);
                memset(tty->flip.flag_buf_ptr, 0, stlen);
                tty->flip.char_buf_ptr += stlen;
                tty->flip.flag_buf_ptr += stlen;
                tty->flip.count += stlen;

                len -= stlen;
                tail += stlen;
                if (tail >= size) {
                        tail = 0;
                        stlen = head;
                }
        }
        rp = &((volatile cdkasy_t *) EBRDGETMEMPTR(brdp, portp->addr))->rxq;
        rp->tail = tail;

        if (head != tail)
                set_bit(ST_RXING, &portp->state);

        tty_schedule_flip(tty);
}

/*****************************************************************************/

/*
 *      Set up and carry out any delayed commands. There is only a small set
 *      of slave commands that can be done "off-level". So it is not too
 *      difficult to deal with them here.
 */

static void stli_dodelaycmd(stliport_t *portp, volatile cdkctrl_t *cp)
{
        int     cmd;

        if (test_bit(ST_DOSIGS, &portp->state)) {
                if (test_bit(ST_DOFLUSHTX, &portp->state) &&
                    test_bit(ST_DOFLUSHRX, &portp->state))
                        cmd = A_SETSIGNALSF;
                else if (test_bit(ST_DOFLUSHTX, &portp->state))
                        cmd = A_SETSIGNALSFTX;
                else if (test_bit(ST_DOFLUSHRX, &portp->state))
                        cmd = A_SETSIGNALSFRX;
                else
                        cmd = A_SETSIGNALS;
                clear_bit(ST_DOFLUSHTX, &portp->state);
                clear_bit(ST_DOFLUSHRX, &portp->state);
                clear_bit(ST_DOSIGS, &portp->state);
                memcpy((void *) &(cp->args[0]), (void *) &portp->asig,
                        sizeof(asysigs_t));
                cp->status = 0;
                cp->cmd = cmd;
                set_bit(ST_CMDING, &portp->state);
        } else if (test_bit(ST_DOFLUSHTX, &portp->state) ||
            test_bit(ST_DOFLUSHRX, &portp->state)) {
                cmd = ((test_bit(ST_DOFLUSHTX, &portp->state)) ? FLUSHTX : 0);
                cmd |= ((test_bit(ST_DOFLUSHRX, &portp->state)) ? FLUSHRX : 0);
                clear_bit(ST_DOFLUSHTX, &portp->state);
                clear_bit(ST_DOFLUSHRX, &portp->state);
                memcpy((void *) &(cp->args[0]), (void *) &cmd, sizeof(int));
                cp->status = 0;
                cp->cmd = A_FLUSH;
                set_bit(ST_CMDING, &portp->state);
        }
}

/*****************************************************************************/

/*
 *      Host command service checking. This handles commands or messages
 *      coming from the slave to the host. Must have board shared memory
 *      enabled and interrupts off when called. Notice that by servicing the
 *      read data last we don't need to change the shared memory pointer
 *      during processing (which is a slow IO operation).
 *      Return value indicates if this port is still awaiting actions from
 *      the slave (like open, command, or even TX data being sent). If 0
 *      then port is still busy, otherwise no longer busy.
 */

static int stli_hostcmd(stlibrd_t *brdp, stliport_t *portp)
{
        volatile cdkasy_t       *ap;
        volatile cdkctrl_t      *cp;
        struct tty_struct       *tty;
        asynotify_t             nt;
        unsigned long           oldsigs;
        int                     rc, donerx;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_hostcmd(brdp=%x,channr=%d)\n",
                        (int) brdp, channr);
#endif

        ap = (volatile cdkasy_t *) EBRDGETMEMPTR(brdp, portp->addr);
        cp = &ap->ctrl;

/*
 *      Check if we are waiting for an open completion message.
 */
        if (test_bit(ST_OPENING, &portp->state)) {
                rc = (int) cp->openarg;
                if ((cp->open == 0) && (rc != 0)) {
                        if (rc > 0)
                                rc--;
                        cp->openarg = 0;
                        portp->rc = rc;
                        clear_bit(ST_OPENING, &portp->state);
                        wake_up_interruptible(&portp->raw_wait);
                }
        }

/*
 *      Check if we are waiting for a close completion message.
 */
        if (test_bit(ST_CLOSING, &portp->state)) {
                rc = (int) cp->closearg;
                if ((cp->close == 0) && (rc != 0)) {
                        if (rc > 0)
                                rc--;
                        cp->closearg = 0;
                        portp->rc = rc;
                        clear_bit(ST_CLOSING, &portp->state);
                        wake_up_interruptible(&portp->raw_wait);
                }
        }

/*
 *      Check if we are waiting for a command completion message. We may
 *      need to copy out the command results associated with this command.
 */
        if (test_bit(ST_CMDING, &portp->state)) {
                rc = cp->status;
                if ((cp->cmd == 0) && (rc != 0)) {
                        if (rc > 0)
                                rc--;
                        if (portp->argp != (void *) NULL) {
                                memcpy(portp->argp, (void *) &(cp->args[0]),
                                        portp->argsize);
                                portp->argp = (void *) NULL;
                        }
                        cp->status = 0;
                        portp->rc = rc;
                        clear_bit(ST_CMDING, &portp->state);
                        stli_dodelaycmd(portp, cp);
                        wake_up_interruptible(&portp->raw_wait);
                }
        }

/*
 *      Check for any notification messages ready. This includes lots of
 *      different types of events - RX chars ready, RX break received,
 *      TX data low or empty in the slave, modem signals changed state.
 */
        donerx = 0;

        if (ap->notify) {
                nt = ap->changed;
                ap->notify = 0;
                tty = portp->tty;

                if (nt.signal & SG_DCD) {
                        oldsigs = portp->sigs;
                        portp->sigs = stli_mktiocm(nt.sigvalue);
                        clear_bit(ST_GETSIGS, &portp->state);
                        if ((portp->sigs & TIOCM_CD) &&
                            ((oldsigs & TIOCM_CD) == 0))
                                wake_up_interruptible(&portp->open_wait);
                        if ((oldsigs & TIOCM_CD) &&
                            ((portp->sigs & TIOCM_CD) == 0)) {
                                if (portp->flags & ASYNC_CHECK_CD) {
                                        if (tty)
                                                schedule_work(&portp->tqhangup);
                                }
                        }
                }

                if (nt.data & DT_TXEMPTY)
                        clear_bit(ST_TXBUSY, &portp->state);
                if (nt.data & (DT_TXEMPTY | DT_TXLOW)) {
                        if (tty != (struct tty_struct *) NULL) {
                                if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
                                    tty->ldisc.write_wakeup) {
                                        (tty->ldisc.write_wakeup)(tty);
                                        EBRDENABLE(brdp);
                                }
                                wake_up_interruptible(&tty->write_wait);
                        }
                }

                if ((nt.data & DT_RXBREAK) && (portp->rxmarkmsk & BRKINT)) {
                        if (tty != (struct tty_struct *) NULL) {
                                if (tty->flip.count < TTY_FLIPBUF_SIZE) {
                                        tty->flip.count++;
                                        *tty->flip.flag_buf_ptr++ = TTY_BREAK;
                                        *tty->flip.char_buf_ptr++ = 0;
                                        if (portp->flags & ASYNC_SAK) {
                                                do_SAK(tty);
                                                EBRDENABLE(brdp);
                                        }
                                        tty_schedule_flip(tty);
                                }
                        }
                }

                if (nt.data & DT_RXBUSY) {
                        donerx++;
                        stli_read(brdp, portp);
                }
        }

/*
 *      It might seem odd that we are checking for more RX chars here.
 *      But, we need to handle the case where the tty buffer was previously
 *      filled, but we had more characters to pass up. The slave will not
 *      send any more RX notify messages until the RX buffer has been emptied.
 *      But it will leave the service bits on (since the buffer is not empty).
 *      So from here we can try to process more RX chars.
 */
        if ((!donerx) && test_bit(ST_RXING, &portp->state)) {
                clear_bit(ST_RXING, &portp->state);
                stli_read(brdp, portp);
        }

        return((test_bit(ST_OPENING, &portp->state) ||
                test_bit(ST_CLOSING, &portp->state) ||
                test_bit(ST_CMDING, &portp->state) ||
                test_bit(ST_TXBUSY, &portp->state) ||
                test_bit(ST_RXING, &portp->state)) ? 0 : 1);
}

/*****************************************************************************/

/*
 *      Service all ports on a particular board. Assumes that the boards
 *      shared memory is enabled, and that the page pointer is pointed
 *      at the cdk header structure.
 */

static void stli_brdpoll(stlibrd_t *brdp, volatile cdkhdr_t *hdrp)
{
        stliport_t      *portp;
        unsigned char   hostbits[(STL_MAXCHANS / 8) + 1];
        unsigned char   slavebits[(STL_MAXCHANS / 8) + 1];
        unsigned char   *slavep;
        int             bitpos, bitat, bitsize;
        int             channr, nrdevs, slavebitchange;

        bitsize = brdp->bitsize;
        nrdevs = brdp->nrdevs;

/*
 *      Check if slave wants any service. Basically we try to do as
 *      little work as possible here. There are 2 levels of service
 *      bits. So if there is nothing to do we bail early. We check
 *      8 service bits at a time in the inner loop, so we can bypass
 *      the lot if none of them want service.
 */
        memcpy(&hostbits[0], (((unsigned char *) hdrp) + brdp->hostoffset),
                bitsize);

        memset(&slavebits[0], 0, bitsize);
        slavebitchange = 0;

        for (bitpos = 0; (bitpos < bitsize); bitpos++) {
                if (hostbits[bitpos] == 0)
                        continue;
                channr = bitpos * 8;
                for (bitat = 0x1; (channr < nrdevs); channr++, bitat <<= 1) {
                        if (hostbits[bitpos] & bitat) {
                                portp = brdp->ports[(channr - 1)];
                                if (stli_hostcmd(brdp, portp)) {
                                        slavebitchange++;
                                        slavebits[bitpos] |= bitat;
                                }
                        }
                }
        }

/*
 *      If any of the ports are no longer busy then update them in the
 *      slave request bits. We need to do this after, since a host port
 *      service may initiate more slave requests.
 */
        if (slavebitchange) {
                hdrp = (volatile cdkhdr_t *) EBRDGETMEMPTR(brdp, CDK_CDKADDR);
                slavep = ((unsigned char *) hdrp) + brdp->slaveoffset;
                for (bitpos = 0; (bitpos < bitsize); bitpos++) {
                        if (slavebits[bitpos])
                                slavep[bitpos] &= ~slavebits[bitpos];
                }
        }
}

/*****************************************************************************/

/*
 *      Driver poll routine. This routine polls the boards in use and passes
 *      messages back up to host when necessary. This is actually very
 *      CPU efficient, since we will always have the kernel poll clock, it
 *      adds only a few cycles when idle (since board service can be
 *      determined very easily), but when loaded generates no interrupts
 *      (with their expensive associated context change).
 */

static void stli_poll(unsigned long arg)
{
        volatile cdkhdr_t       *hdrp;
        stlibrd_t               *brdp;
        int                     brdnr;

        stli_timerlist.expires = STLI_TIMEOUT;
        add_timer(&stli_timerlist);

/*
 *      Check each board and do any servicing required.
 */
        for (brdnr = 0; (brdnr < stli_nrbrds); brdnr++) {
                brdp = stli_brds[brdnr];
                if (brdp == (stlibrd_t *) NULL)
                        continue;
                if ((brdp->state & BST_STARTED) == 0)
                        continue;

                EBRDENABLE(brdp);
                hdrp = (volatile cdkhdr_t *) EBRDGETMEMPTR(brdp, CDK_CDKADDR);
                if (hdrp->hostreq)
                        stli_brdpoll(brdp, hdrp);
                EBRDDISABLE(brdp);
        }
}

/*****************************************************************************/

/*
 *      Translate the termios settings into the port setting structure of
 *      the slave.
 */

static void stli_mkasyport(stliport_t *portp, asyport_t *pp, struct termios *tiosp)
{
#ifdef DEBUG
        printk(KERN_DEBUG "stli_mkasyport(portp=%x,pp=%x,tiosp=%d)\n",
                (int) portp, (int) pp, (int) tiosp);
#endif

        memset(pp, 0, sizeof(asyport_t));

/*
 *      Start of by setting the baud, char size, parity and stop bit info.
 */
        pp->baudout = tiosp->c_cflag & CBAUD;
        if (pp->baudout & CBAUDEX) {
                pp->baudout &= ~CBAUDEX;
                if ((pp->baudout < 1) || (pp->baudout > 4))
                        tiosp->c_cflag &= ~CBAUDEX;
                else
                        pp->baudout += 15;
        }
        pp->baudout = stli_baudrates[pp->baudout];
        if ((tiosp->c_cflag & CBAUD) == B38400) {
                if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
                        pp->baudout = 57600;
                else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
                        pp->baudout = 115200;
                else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
                        pp->baudout = 230400;
                else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
                        pp->baudout = 460800;
                else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
                        pp->baudout = (portp->baud_base / portp->custom_divisor);
        }
        if (pp->baudout > STL_MAXBAUD)
                pp->baudout = STL_MAXBAUD;
        pp->baudin = pp->baudout;

        switch (tiosp->c_cflag & CSIZE) {
        case CS5:
                pp->csize = 5;
                break;
        case CS6:
                pp->csize = 6;
                break;
        case CS7:
                pp->csize = 7;
                break;
        default:
                pp->csize = 8;
                break;
        }

        if (tiosp->c_cflag & CSTOPB)
                pp->stopbs = PT_STOP2;
        else
                pp->stopbs = PT_STOP1;

        if (tiosp->c_cflag & PARENB) {
                if (tiosp->c_cflag & PARODD)
                        pp->parity = PT_ODDPARITY;
                else
                        pp->parity = PT_EVENPARITY;
        } else {
                pp->parity = PT_NOPARITY;
        }

/*
 *      Set up any flow control options enabled.
 */
        if (tiosp->c_iflag & IXON) {
                pp->flow |= F_IXON;
                if (tiosp->c_iflag & IXANY)
                        pp->flow |= F_IXANY;
        }
        if (tiosp->c_cflag & CRTSCTS)
                pp->flow |= (F_RTSFLOW | F_CTSFLOW);

        pp->startin = tiosp->c_cc[VSTART];
        pp->stopin = tiosp->c_cc[VSTOP];
        pp->startout = tiosp->c_cc[VSTART];
        pp->stopout = tiosp->c_cc[VSTOP];

/*
 *      Set up the RX char marking mask with those RX error types we must
 *      catch. We can get the slave to help us out a little here, it will
 *      ignore parity errors and breaks for us, and mark parity errors in
 *      the data stream.
 */
        if (tiosp->c_iflag & IGNPAR)
                pp->iflag |= FI_IGNRXERRS;
        if (tiosp->c_iflag & IGNBRK)
                pp->iflag |= FI_IGNBREAK;

        portp->rxmarkmsk = 0;
        if (tiosp->c_iflag & (INPCK | PARMRK))
                pp->iflag |= FI_1MARKRXERRS;
        if (tiosp->c_iflag & BRKINT)
                portp->rxmarkmsk |= BRKINT;

/*
 *      Set up clocal processing as required.
 */
        if (tiosp->c_cflag & CLOCAL)
                portp->flags &= ~ASYNC_CHECK_CD;
        else
                portp->flags |= ASYNC_CHECK_CD;

/*
 *      Transfer any persistent flags into the asyport structure.
 */
        pp->pflag = (portp->pflag & 0xffff);
        pp->vmin = (portp->pflag & P_RXIMIN) ? 1 : 0;
        pp->vtime = (portp->pflag & P_RXITIME) ? 1 : 0;
        pp->cc[1] = (portp->pflag & P_RXTHOLD) ? 1 : 0;
}

/*****************************************************************************/

/*
 *      Construct a slave signals structure for setting the DTR and RTS
 *      signals as specified.
 */

static void stli_mkasysigs(asysigs_t *sp, int dtr, int rts)
{
#ifdef DEBUG
        printk(KERN_DEBUG "stli_mkasysigs(sp=%x,dtr=%d,rts=%d)\n",
                        (int) sp, dtr, rts);
#endif

        memset(sp, 0, sizeof(asysigs_t));
        if (dtr >= 0) {
                sp->signal |= SG_DTR;
                sp->sigvalue |= ((dtr > 0) ? SG_DTR : 0);
        }
        if (rts >= 0) {
                sp->signal |= SG_RTS;
                sp->sigvalue |= ((rts > 0) ? SG_RTS : 0);
        }
}

/*****************************************************************************/

/*
 *      Convert the signals returned from the slave into a local TIOCM type
 *      signals value. We keep them locally in TIOCM format.
 */

static long stli_mktiocm(unsigned long sigvalue)
{
        long    tiocm;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_mktiocm(sigvalue=%x)\n", (int) sigvalue);
#endif

        tiocm = 0;
        tiocm |= ((sigvalue & SG_DCD) ? TIOCM_CD : 0);
        tiocm |= ((sigvalue & SG_CTS) ? TIOCM_CTS : 0);
        tiocm |= ((sigvalue & SG_RI) ? TIOCM_RI : 0);
        tiocm |= ((sigvalue & SG_DSR) ? TIOCM_DSR : 0);
        tiocm |= ((sigvalue & SG_DTR) ? TIOCM_DTR : 0);
        tiocm |= ((sigvalue & SG_RTS) ? TIOCM_RTS : 0);
        return(tiocm);
}

/*****************************************************************************/

/*
 *      All panels and ports actually attached have been worked out. All
 *      we need to do here is set up the appropriate per port data structures.
 */

static int stli_initports(stlibrd_t *brdp)
{
        stliport_t      *portp;
        int             i, panelnr, panelport;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_initports(brdp=%x)\n", (int) brdp);
#endif

        for (i = 0, panelnr = 0, panelport = 0; (i < brdp->nrports); i++) {
                portp = (stliport_t *) stli_memalloc(sizeof(stliport_t));
                if (portp == (stliport_t *) NULL) {
                        printk("STALLION: failed to allocate port structure\n");
                        continue;
                }

                memset(portp, 0, sizeof(stliport_t));
                portp->magic = STLI_PORTMAGIC;
                portp->portnr = i;
                portp->brdnr = brdp->brdnr;
                portp->panelnr = panelnr;
                portp->baud_base = STL_BAUDBASE;
                portp->close_delay = STL_CLOSEDELAY;
                portp->closing_wait = 30 * HZ;
                INIT_WORK(&portp->tqhangup, stli_dohangup, portp);
                init_waitqueue_head(&portp->open_wait);
                init_waitqueue_head(&portp->close_wait);
                init_waitqueue_head(&portp->raw_wait);
                panelport++;
                if (panelport >= brdp->panels[panelnr]) {
                        panelport = 0;
                        panelnr++;
                }
                brdp->ports[i] = portp;
        }

        return(0);
}

/*****************************************************************************/

/*
 *      All the following routines are board specific hardware operations.
 */

static void stli_ecpinit(stlibrd_t *brdp)
{
        unsigned long   memconf;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_ecpinit(brdp=%d)\n", (int) brdp);
#endif

        outb(ECP_ATSTOP, (brdp->iobase + ECP_ATCONFR));
        udelay(10);
        outb(ECP_ATDISABLE, (brdp->iobase + ECP_ATCONFR));
        udelay(100);

        memconf = (brdp->memaddr & ECP_ATADDRMASK) >> ECP_ATADDRSHFT;
        outb(memconf, (brdp->iobase + ECP_ATMEMAR));
}

/*****************************************************************************/

static void stli_ecpenable(stlibrd_t *brdp)
{       
#ifdef DEBUG
        printk(KERN_DEBUG "stli_ecpenable(brdp=%x)\n", (int) brdp);
#endif
        outb(ECP_ATENABLE, (brdp->iobase + ECP_ATCONFR));
}

/*****************************************************************************/

static void stli_ecpdisable(stlibrd_t *brdp)
{       
#ifdef DEBUG
        printk(KERN_DEBUG "stli_ecpdisable(brdp=%x)\n", (int) brdp);
#endif
        outb(ECP_ATDISABLE, (brdp->iobase + ECP_ATCONFR));
}

/*****************************************************************************/

static char *stli_ecpgetmemptr(stlibrd_t *brdp, unsigned long offset, int line)
{       
        void            *ptr;
        unsigned char   val;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_ecpgetmemptr(brdp=%x,offset=%x)\n", (int) brdp,
                (int) offset);
#endif

        if (offset > brdp->memsize) {
                printk(KERN_ERR "STALLION: shared memory pointer=%x out of "
                                "range at line=%d(%d), brd=%d\n",
                        (int) offset, line, __LINE__, brdp->brdnr);
                ptr = NULL;
                val = 0;
        } else {
                ptr = brdp->membase + (offset % ECP_ATPAGESIZE);
                val = (unsigned char) (offset / ECP_ATPAGESIZE);
        }
        outb(val, (brdp->iobase + ECP_ATMEMPR));
        return(ptr);
}

/*****************************************************************************/

static void stli_ecpreset(stlibrd_t *brdp)
{       
#ifdef DEBUG
        printk(KERN_DEBUG "stli_ecpreset(brdp=%x)\n", (int) brdp);
#endif

        outb(ECP_ATSTOP, (brdp->iobase + ECP_ATCONFR));
        udelay(10);
        outb(ECP_ATDISABLE, (brdp->iobase + ECP_ATCONFR));
        udelay(500);
}

/*****************************************************************************/

static void stli_ecpintr(stlibrd_t *brdp)
{       
#ifdef DEBUG
        printk(KERN_DEBUG "stli_ecpintr(brdp=%x)\n", (int) brdp);
#endif
        outb(0x1, brdp->iobase);
}

/*****************************************************************************/

/*
 *      The following set of functions act on ECP EISA boards.
 */

static void stli_ecpeiinit(stlibrd_t *brdp)
{
        unsigned long   memconf;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_ecpeiinit(brdp=%x)\n", (int) brdp);
#endif

        outb(0x1, (brdp->iobase + ECP_EIBRDENAB));
        outb(ECP_EISTOP, (brdp->iobase + ECP_EICONFR));
        udelay(10);
        outb(ECP_EIDISABLE, (brdp->iobase + ECP_EICONFR));
        udelay(500);

        memconf = (brdp->memaddr & ECP_EIADDRMASKL) >> ECP_EIADDRSHFTL;
        outb(memconf, (brdp->iobase + ECP_EIMEMARL));
        memconf = (brdp->memaddr & ECP_EIADDRMASKH) >> ECP_EIADDRSHFTH;
        outb(memconf, (brdp->iobase + ECP_EIMEMARH));
}

/*****************************************************************************/

static void stli_ecpeienable(stlibrd_t *brdp)
{       
        outb(ECP_EIENABLE, (brdp->iobase + ECP_EICONFR));
}

/*****************************************************************************/

static void stli_ecpeidisable(stlibrd_t *brdp)
{       
        outb(ECP_EIDISABLE, (brdp->iobase + ECP_EICONFR));
}

/*****************************************************************************/

static char *stli_ecpeigetmemptr(stlibrd_t *brdp, unsigned long offset, int line)
{       
        void            *ptr;
        unsigned char   val;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_ecpeigetmemptr(brdp=%x,offset=%x,line=%d)\n",
                (int) brdp, (int) offset, line);
#endif

        if (offset > brdp->memsize) {
                printk(KERN_ERR "STALLION: shared memory pointer=%x out of "
                                "range at line=%d(%d), brd=%d\n",
                        (int) offset, line, __LINE__, brdp->brdnr);
                ptr = NULL;
                val = 0;
        } else {
                ptr = brdp->membase + (offset % ECP_EIPAGESIZE);
                if (offset < ECP_EIPAGESIZE)
                        val = ECP_EIENABLE;
                else
                        val = ECP_EIENABLE | 0x40;
        }
        outb(val, (brdp->iobase + ECP_EICONFR));
        return(ptr);
}

/*****************************************************************************/

static void stli_ecpeireset(stlibrd_t *brdp)
{       
        outb(ECP_EISTOP, (brdp->iobase + ECP_EICONFR));
        udelay(10);
        outb(ECP_EIDISABLE, (brdp->iobase + ECP_EICONFR));
        udelay(500);
}

/*****************************************************************************/

/*
 *      The following set of functions act on ECP MCA boards.
 */

static void stli_ecpmcenable(stlibrd_t *brdp)
{       
        outb(ECP_MCENABLE, (brdp->iobase + ECP_MCCONFR));
}

/*****************************************************************************/

static void stli_ecpmcdisable(stlibrd_t *brdp)
{       
        outb(ECP_MCDISABLE, (brdp->iobase + ECP_MCCONFR));
}

/*****************************************************************************/

static char *stli_ecpmcgetmemptr(stlibrd_t *brdp, unsigned long offset, int line)
{       
        void            *ptr;
        unsigned char   val;

        if (offset > brdp->memsize) {
                printk(KERN_ERR "STALLION: shared memory pointer=%x out of "
                                "range at line=%d(%d), brd=%d\n",
                        (int) offset, line, __LINE__, brdp->brdnr);
                ptr = NULL;
                val = 0;
        } else {
                ptr = brdp->membase + (offset % ECP_MCPAGESIZE);
                val = ((unsigned char) (offset / ECP_MCPAGESIZE)) | ECP_MCENABLE;
        }
        outb(val, (brdp->iobase + ECP_MCCONFR));
        return(ptr);
}

/*****************************************************************************/

static void stli_ecpmcreset(stlibrd_t *brdp)
{       
        outb(ECP_MCSTOP, (brdp->iobase + ECP_MCCONFR));
        udelay(10);
        outb(ECP_MCDISABLE, (brdp->iobase + ECP_MCCONFR));
        udelay(500);
}

/*****************************************************************************/

/*
 *      The following set of functions act on ECP PCI boards.
 */

static void stli_ecppciinit(stlibrd_t *brdp)
{
#ifdef DEBUG
        printk(KERN_DEBUG "stli_ecppciinit(brdp=%x)\n", (int) brdp);
#endif

        outb(ECP_PCISTOP, (brdp->iobase + ECP_PCICONFR));
        udelay(10);
        outb(0, (brdp->iobase + ECP_PCICONFR));
        udelay(500);
}

/*****************************************************************************/

static char *stli_ecppcigetmemptr(stlibrd_t *brdp, unsigned long offset, int line)
{       
        void            *ptr;
        unsigned char   val;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_ecppcigetmemptr(brdp=%x,offset=%x,line=%d)\n",
                (int) brdp, (int) offset, line);
#endif

        if (offset > brdp->memsize) {
                printk(KERN_ERR "STALLION: shared memory pointer=%x out of "
                                "range at line=%d(%d), board=%d\n",
                                (int) offset, line, __LINE__, brdp->brdnr);
                ptr = NULL;
                val = 0;
        } else {
                ptr = brdp->membase + (offset % ECP_PCIPAGESIZE);
                val = (offset / ECP_PCIPAGESIZE) << 1;
        }
        outb(val, (brdp->iobase + ECP_PCICONFR));
        return(ptr);
}

/*****************************************************************************/

static void stli_ecppcireset(stlibrd_t *brdp)
{       
        outb(ECP_PCISTOP, (brdp->iobase + ECP_PCICONFR));
        udelay(10);
        outb(0, (brdp->iobase + ECP_PCICONFR));
        udelay(500);
}

/*****************************************************************************/

/*
 *      The following routines act on ONboards.
 */

static void stli_onbinit(stlibrd_t *brdp)
{
        unsigned long   memconf;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_onbinit(brdp=%d)\n", (int) brdp);
#endif

        outb(ONB_ATSTOP, (brdp->iobase + ONB_ATCONFR));
        udelay(10);
        outb(ONB_ATDISABLE, (brdp->iobase + ONB_ATCONFR));
        mdelay(1000);

        memconf = (brdp->memaddr & ONB_ATADDRMASK) >> ONB_ATADDRSHFT;
        outb(memconf, (brdp->iobase + ONB_ATMEMAR));
        outb(0x1, brdp->iobase);
        mdelay(1);
}

/*****************************************************************************/

static void stli_onbenable(stlibrd_t *brdp)
{       
#ifdef DEBUG
        printk(KERN_DEBUG "stli_onbenable(brdp=%x)\n", (int) brdp);
#endif
        outb((brdp->enabval | ONB_ATENABLE), (brdp->iobase + ONB_ATCONFR));
}

/*****************************************************************************/

static void stli_onbdisable(stlibrd_t *brdp)
{       
#ifdef DEBUG
        printk(KERN_DEBUG "stli_onbdisable(brdp=%x)\n", (int) brdp);
#endif
        outb((brdp->enabval | ONB_ATDISABLE), (brdp->iobase + ONB_ATCONFR));
}

/*****************************************************************************/

static char *stli_onbgetmemptr(stlibrd_t *brdp, unsigned long offset, int line)
{       
        void    *ptr;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_onbgetmemptr(brdp=%x,offset=%x)\n", (int) brdp,
                (int) offset);
#endif

        if (offset > brdp->memsize) {
                printk(KERN_ERR "STALLION: shared memory pointer=%x out of "
                                "range at line=%d(%d), brd=%d\n",
                                (int) offset, line, __LINE__, brdp->brdnr);
                ptr = NULL;
        } else {
                ptr = brdp->membase + (offset % ONB_ATPAGESIZE);
        }
        return(ptr);
}

/*****************************************************************************/

static void stli_onbreset(stlibrd_t *brdp)
{       

#ifdef DEBUG
        printk(KERN_DEBUG "stli_onbreset(brdp=%x)\n", (int) brdp);
#endif

        outb(ONB_ATSTOP, (brdp->iobase + ONB_ATCONFR));
        udelay(10);
        outb(ONB_ATDISABLE, (brdp->iobase + ONB_ATCONFR));
        mdelay(1000);
}

/*****************************************************************************/

/*
 *      The following routines act on ONboard EISA.
 */

static void stli_onbeinit(stlibrd_t *brdp)
{
        unsigned long   memconf;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_onbeinit(brdp=%d)\n", (int) brdp);
#endif

        outb(0x1, (brdp->iobase + ONB_EIBRDENAB));
        outb(ONB_EISTOP, (brdp->iobase + ONB_EICONFR));
        udelay(10);
        outb(ONB_EIDISABLE, (brdp->iobase + ONB_EICONFR));
        mdelay(1000);

        memconf = (brdp->memaddr & ONB_EIADDRMASKL) >> ONB_EIADDRSHFTL;
        outb(memconf, (brdp->iobase + ONB_EIMEMARL));
        memconf = (brdp->memaddr & ONB_EIADDRMASKH) >> ONB_EIADDRSHFTH;
        outb(memconf, (brdp->iobase + ONB_EIMEMARH));
        outb(0x1, brdp->iobase);
        mdelay(1);
}

/*****************************************************************************/

static void stli_onbeenable(stlibrd_t *brdp)
{       
#ifdef DEBUG
        printk(KERN_DEBUG "stli_onbeenable(brdp=%x)\n", (int) brdp);
#endif
        outb(ONB_EIENABLE, (brdp->iobase + ONB_EICONFR));
}

/*****************************************************************************/

static void stli_onbedisable(stlibrd_t *brdp)
{       
#ifdef DEBUG
        printk(KERN_DEBUG "stli_onbedisable(brdp=%x)\n", (int) brdp);
#endif
        outb(ONB_EIDISABLE, (brdp->iobase + ONB_EICONFR));
}

/*****************************************************************************/

static char *stli_onbegetmemptr(stlibrd_t *brdp, unsigned long offset, int line)
{       
        void            *ptr;
        unsigned char   val;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_onbegetmemptr(brdp=%x,offset=%x,line=%d)\n",
                (int) brdp, (int) offset, line);
#endif

        if (offset > brdp->memsize) {
                printk(KERN_ERR "STALLION: shared memory pointer=%x out of "
                                "range at line=%d(%d), brd=%d\n",
                        (int) offset, line, __LINE__, brdp->brdnr);
                ptr = NULL;
                val = 0;
        } else {
                ptr = brdp->membase + (offset % ONB_EIPAGESIZE);
                if (offset < ONB_EIPAGESIZE)
                        val = ONB_EIENABLE;
                else
                        val = ONB_EIENABLE | 0x40;
        }
        outb(val, (brdp->iobase + ONB_EICONFR));
        return(ptr);
}

/*****************************************************************************/

static void stli_onbereset(stlibrd_t *brdp)
{       

#ifdef DEBUG
        printk(KERN_ERR "stli_onbereset(brdp=%x)\n", (int) brdp);
#endif

        outb(ONB_EISTOP, (brdp->iobase + ONB_EICONFR));
        udelay(10);
        outb(ONB_EIDISABLE, (brdp->iobase + ONB_EICONFR));
        mdelay(1000);
}

/*****************************************************************************/

/*
 *      The following routines act on Brumby boards.
 */

static void stli_bbyinit(stlibrd_t *brdp)
{

#ifdef DEBUG
        printk(KERN_ERR "stli_bbyinit(brdp=%d)\n", (int) brdp);
#endif

        outb(BBY_ATSTOP, (brdp->iobase + BBY_ATCONFR));
        udelay(10);
        outb(0, (brdp->iobase + BBY_ATCONFR));
        mdelay(1000);
        outb(0x1, brdp->iobase);
        mdelay(1);
}

/*****************************************************************************/

static char *stli_bbygetmemptr(stlibrd_t *brdp, unsigned long offset, int line)
{       
        void            *ptr;
        unsigned char   val;

#ifdef DEBUG
        printk(KERN_ERR "stli_bbygetmemptr(brdp=%x,offset=%x)\n", (int) brdp,
                (int) offset);
#endif

        if (offset > brdp->memsize) {
                printk(KERN_ERR "STALLION: shared memory pointer=%x out of "
                                "range at line=%d(%d), brd=%d\n",
                                (int) offset, line, __LINE__, brdp->brdnr);
                ptr = NULL;
                val = 0;
        } else {
                ptr = brdp->membase + (offset % BBY_PAGESIZE);
                val = (unsigned char) (offset / BBY_PAGESIZE);
        }
        outb(val, (brdp->iobase + BBY_ATCONFR));
        return(ptr);
}

/*****************************************************************************/

static void stli_bbyreset(stlibrd_t *brdp)
{       

#ifdef DEBUG
        printk(KERN_DEBUG "stli_bbyreset(brdp=%x)\n", (int) brdp);
#endif

        outb(BBY_ATSTOP, (brdp->iobase + BBY_ATCONFR));
        udelay(10);
        outb(0, (brdp->iobase + BBY_ATCONFR));
        mdelay(1000);
}

/*****************************************************************************/

/*
 *      The following routines act on original old Stallion boards.
 */

static void stli_stalinit(stlibrd_t *brdp)
{

#ifdef DEBUG
        printk(KERN_DEBUG "stli_stalinit(brdp=%d)\n", (int) brdp);
#endif

        outb(0x1, brdp->iobase);
        mdelay(1000);
}

/*****************************************************************************/

static char *stli_stalgetmemptr(stlibrd_t *brdp, unsigned long offset, int line)
{       
        void    *ptr;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_stalgetmemptr(brdp=%x,offset=%x)\n", (int) brdp,
                (int) offset);
#endif

        if (offset > brdp->memsize) {
                printk(KERN_ERR "STALLION: shared memory pointer=%x out of "
                                "range at line=%d(%d), brd=%d\n",
                                (int) offset, line, __LINE__, brdp->brdnr);
                ptr = NULL;
        } else {
                ptr = brdp->membase + (offset % STAL_PAGESIZE);
        }
        return(ptr);
}

/*****************************************************************************/

static void stli_stalreset(stlibrd_t *brdp)
{       
        volatile unsigned long  *vecp;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_stalreset(brdp=%x)\n", (int) brdp);
#endif

        vecp = (volatile unsigned long *) (brdp->membase + 0x30);
        *vecp = 0xffff0000;
        outb(0, brdp->iobase);
        mdelay(1000);
}

/*****************************************************************************/

/*
 *      Try to find an ECP board and initialize it. This handles only ECP
 *      board types.
 */

static int stli_initecp(stlibrd_t *brdp)
{
        cdkecpsig_t     sig;
        cdkecpsig_t     *sigsp;
        unsigned int    status, nxtid;
        char            *name;
        int             panelnr, nrports;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_initecp(brdp=%x)\n", (int) brdp);
#endif

        if (!request_region(brdp->iobase, brdp->iosize, "istallion"))
                return -EIO;
        
        if ((brdp->iobase == 0) || (brdp->memaddr == 0))
        {
                release_region(brdp->iobase, brdp->iosize);
                return(-ENODEV);
        }

        brdp->iosize = ECP_IOSIZE;

/*
 *      Based on the specific board type setup the common vars to access
 *      and enable shared memory. Set all board specific information now
 *      as well.
 */
        switch (brdp->brdtype) {
        case BRD_ECP:
                brdp->membase = (void *) brdp->memaddr;
                brdp->memsize = ECP_MEMSIZE;
                brdp->pagesize = ECP_ATPAGESIZE;
                brdp->init = stli_ecpinit;
                brdp->enable = stli_ecpenable;
                brdp->reenable = stli_ecpenable;
                brdp->disable = stli_ecpdisable;
                brdp->getmemptr = stli_ecpgetmemptr;
                brdp->intr = stli_ecpintr;
                brdp->reset = stli_ecpreset;
                name = "serial(EC8/64)";
                break;

        case BRD_ECPE:
                brdp->membase = (void *) brdp->memaddr;
                brdp->memsize = ECP_MEMSIZE;
                brdp->pagesize = ECP_EIPAGESIZE;
                brdp->init = stli_ecpeiinit;
                brdp->enable = stli_ecpeienable;
                brdp->reenable = stli_ecpeienable;
                brdp->disable = stli_ecpeidisable;
                brdp->getmemptr = stli_ecpeigetmemptr;
                brdp->intr = stli_ecpintr;
                brdp->reset = stli_ecpeireset;
                name = "serial(EC8/64-EI)";
                break;

        case BRD_ECPMC:
                brdp->membase = (void *) brdp->memaddr;
                brdp->memsize = ECP_MEMSIZE;
                brdp->pagesize = ECP_MCPAGESIZE;
                brdp->init = NULL;
                brdp->enable = stli_ecpmcenable;
                brdp->reenable = stli_ecpmcenable;
                brdp->disable = stli_ecpmcdisable;
                brdp->getmemptr = stli_ecpmcgetmemptr;
                brdp->intr = stli_ecpintr;
                brdp->reset = stli_ecpmcreset;
                name = "serial(EC8/64-MCA)";
                break;

        case BRD_ECPPCI:
                brdp->membase = (void *) brdp->memaddr;
                brdp->memsize = ECP_PCIMEMSIZE;
                brdp->pagesize = ECP_PCIPAGESIZE;
                brdp->init = stli_ecppciinit;
                brdp->enable = NULL;
                brdp->reenable = NULL;
                brdp->disable = NULL;
                brdp->getmemptr = stli_ecppcigetmemptr;
                brdp->intr = stli_ecpintr;
                brdp->reset = stli_ecppcireset;
                name = "serial(EC/RA-PCI)";
                break;

        default:
                release_region(brdp->iobase, brdp->iosize);
                return(-EINVAL);
        }

/*
 *      The per-board operations structure is all set up, so now let's go
 *      and get the board operational. Firstly initialize board configuration
 *      registers. Set the memory mapping info so we can get at the boards
 *      shared memory.
 */
        EBRDINIT(brdp);

        brdp->membase = ioremap(brdp->memaddr, brdp->memsize);
        if (brdp->membase == (void *) NULL)
        {
                release_region(brdp->iobase, brdp->iosize);
                return(-ENOMEM);
        }

/*
 *      Now that all specific code is set up, enable the shared memory and
 *      look for the a signature area that will tell us exactly what board
 *      this is, and what it is connected to it.
 */
        EBRDENABLE(brdp);
        sigsp = (cdkecpsig_t *) EBRDGETMEMPTR(brdp, CDK_SIGADDR);
        memcpy(&sig, sigsp, sizeof(cdkecpsig_t));
        EBRDDISABLE(brdp);

#if 0
        printk("%s(%d): sig-> magic=%x rom=%x panel=%x,%x,%x,%x,%x,%x,%x,%x\n",
                __FILE__, __LINE__, (int) sig.magic, sig.romver, sig.panelid[0],
                (int) sig.panelid[1], (int) sig.panelid[2],
                (int) sig.panelid[3], (int) sig.panelid[4],
                (int) sig.panelid[5], (int) sig.panelid[6],
                (int) sig.panelid[7]);
#endif

        if (sig.magic != ECP_MAGIC)
        {
                release_region(brdp->iobase, brdp->iosize);
                return(-ENODEV);
        }

/*
 *      Scan through the signature looking at the panels connected to the
 *      board. Calculate the total number of ports as we go.
 */
        for (panelnr = 0, nxtid = 0; (panelnr < STL_MAXPANELS); panelnr++) {
                status = sig.panelid[nxtid];
                if ((status & ECH_PNLIDMASK) != nxtid)
                        break;

                brdp->panelids[panelnr] = status;
                nrports = (status & ECH_PNL16PORT) ? 16 : 8;
                if ((nrports == 16) && ((status & ECH_PNLXPID) == 0))
                        nxtid++;
                brdp->panels[panelnr] = nrports;
                brdp->nrports += nrports;
                nxtid++;
                brdp->nrpanels++;
        }


        brdp->state |= BST_FOUND;
        return(0);
}

/*****************************************************************************/

/*
 *      Try to find an ONboard, Brumby or Stallion board and initialize it.
 *      This handles only these board types.
 */

static int stli_initonb(stlibrd_t *brdp)
{
        cdkonbsig_t     sig;
        cdkonbsig_t     *sigsp;
        char            *name;
        int             i;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_initonb(brdp=%x)\n", (int) brdp);
#endif

/*
 *      Do a basic sanity check on the IO and memory addresses.
 */
        if ((brdp->iobase == 0) || (brdp->memaddr == 0))
                return(-ENODEV);

        brdp->iosize = ONB_IOSIZE;
        
        if (!request_region(brdp->iobase, brdp->iosize, "istallion"))
                return -EIO;

/*
 *      Based on the specific board type setup the common vars to access
 *      and enable shared memory. Set all board specific information now
 *      as well.
 */
        switch (brdp->brdtype) {
        case BRD_ONBOARD:
        case BRD_ONBOARD32:
        case BRD_ONBOARD2:
        case BRD_ONBOARD2_32:
        case BRD_ONBOARDRS:
                brdp->membase = (void *) brdp->memaddr;
                brdp->memsize = ONB_MEMSIZE;
                brdp->pagesize = ONB_ATPAGESIZE;
                brdp->init = stli_onbinit;
                brdp->enable = stli_onbenable;
                brdp->reenable = stli_onbenable;
                brdp->disable = stli_onbdisable;
                brdp->getmemptr = stli_onbgetmemptr;
                brdp->intr = stli_ecpintr;
                brdp->reset = stli_onbreset;
                if (brdp->memaddr > 0x100000)
                        brdp->enabval = ONB_MEMENABHI;
                else
                        brdp->enabval = ONB_MEMENABLO;
                name = "serial(ONBoard)";
                break;

        case BRD_ONBOARDE:
                brdp->membase = (void *) brdp->memaddr;
                brdp->memsize = ONB_EIMEMSIZE;
                brdp->pagesize = ONB_EIPAGESIZE;
                brdp->init = stli_onbeinit;
                brdp->enable = stli_onbeenable;
                brdp->reenable = stli_onbeenable;
                brdp->disable = stli_onbedisable;
                brdp->getmemptr = stli_onbegetmemptr;
                brdp->intr = stli_ecpintr;
                brdp->reset = stli_onbereset;
                name = "serial(ONBoard/E)";
                break;

        case BRD_BRUMBY4:
        case BRD_BRUMBY8:
        case BRD_BRUMBY16:
                brdp->membase = (void *) brdp->memaddr;
                brdp->memsize = BBY_MEMSIZE;
                brdp->pagesize = BBY_PAGESIZE;
                brdp->init = stli_bbyinit;
                brdp->enable = NULL;
                brdp->reenable = NULL;
                brdp->disable = NULL;
                brdp->getmemptr = stli_bbygetmemptr;
                brdp->intr = stli_ecpintr;
                brdp->reset = stli_bbyreset;
                name = "serial(Brumby)";
                break;

        case BRD_STALLION:
                brdp->membase = (void *) brdp->memaddr;
                brdp->memsize = STAL_MEMSIZE;
                brdp->pagesize = STAL_PAGESIZE;
                brdp->init = stli_stalinit;
                brdp->enable = NULL;
                brdp->reenable = NULL;
                brdp->disable = NULL;
                brdp->getmemptr = stli_stalgetmemptr;
                brdp->intr = stli_ecpintr;
                brdp->reset = stli_stalreset;
                name = "serial(Stallion)";
                break;

        default:
                release_region(brdp->iobase, brdp->iosize);
                return(-EINVAL);
        }

/*
 *      The per-board operations structure is all set up, so now let's go
 *      and get the board operational. Firstly initialize board configuration
 *      registers. Set the memory mapping info so we can get at the boards
 *      shared memory.
 */
        EBRDINIT(brdp);

        brdp->membase = ioremap(brdp->memaddr, brdp->memsize);
        if (brdp->membase == (void *) NULL)
        {
                release_region(brdp->iobase, brdp->iosize);
                return(-ENOMEM);
        }

/*
 *      Now that all specific code is set up, enable the shared memory and
 *      look for the a signature area that will tell us exactly what board
 *      this is, and how many ports.
 */
        EBRDENABLE(brdp);
        sigsp = (cdkonbsig_t *) EBRDGETMEMPTR(brdp, CDK_SIGADDR);
        memcpy(&sig, sigsp, sizeof(cdkonbsig_t));
        EBRDDISABLE(brdp);

#if 0
        printk("%s(%d): sig-> magic=%x:%x:%x:%x romver=%x amask=%x:%x:%x\n",
                __FILE__, __LINE__, sig.magic0, sig.magic1, sig.magic2,
                sig.magic3, sig.romver, sig.amask0, sig.amask1, sig.amask2);
#endif

        if ((sig.magic0 != ONB_MAGIC0) || (sig.magic1 != ONB_MAGIC1) ||
            (sig.magic2 != ONB_MAGIC2) || (sig.magic3 != ONB_MAGIC3))
        {
                release_region(brdp->iobase, brdp->iosize);
                return(-ENODEV);
        }

/*
 *      Scan through the signature alive mask and calculate how many ports
 *      there are on this board.
 */
        brdp->nrpanels = 1;
        if (sig.amask1) {
                brdp->nrports = 32;
        } else {
                for (i = 0; (i < 16); i++) {
                        if (((sig.amask0 << i) & 0x8000) == 0)
                                break;
                }
                brdp->nrports = i;
        }
        brdp->panels[0] = brdp->nrports;


        brdp->state |= BST_FOUND;
        return(0);
}

/*****************************************************************************/

/*
 *      Start up a running board. This routine is only called after the
 *      code has been down loaded to the board and is operational. It will
 *      read in the memory map, and get the show on the road...
 */

static int stli_startbrd(stlibrd_t *brdp)
{
        volatile cdkhdr_t       *hdrp;
        volatile cdkmem_t       *memp;
        volatile cdkasy_t       *ap;
        unsigned long           flags;
        stliport_t              *portp;
        int                     portnr, nrdevs, i, rc;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_startbrd(brdp=%x)\n", (int) brdp);
#endif

        rc = 0;

        save_flags(flags);
        cli();
        EBRDENABLE(brdp);
        hdrp = (volatile cdkhdr_t *) EBRDGETMEMPTR(brdp, CDK_CDKADDR);
        nrdevs = hdrp->nrdevs;

#if 0
        printk("%s(%d): CDK version %d.%d.%d --> "
                "nrdevs=%d memp=%x hostp=%x slavep=%x\n",
                 __FILE__, __LINE__, hdrp->ver_release, hdrp->ver_modification,
                 hdrp->ver_fix, nrdevs, (int) hdrp->memp, (int) hdrp->hostp,
                 (int) hdrp->slavep);
#endif

        if (nrdevs < (brdp->nrports + 1)) {
                printk(KERN_ERR "STALLION: slave failed to allocate memory for "
                                "all devices, devices=%d\n", nrdevs);
                brdp->nrports = nrdevs - 1;
        }
        brdp->nrdevs = nrdevs;
        brdp->hostoffset = hdrp->hostp - CDK_CDKADDR;
        brdp->slaveoffset = hdrp->slavep - CDK_CDKADDR;
        brdp->bitsize = (nrdevs + 7) / 8;
        memp = (volatile cdkmem_t *) hdrp->memp;
        if (((unsigned long) memp) > brdp->memsize) {
                printk(KERN_ERR "STALLION: corrupted shared memory region?\n");
                rc = -EIO;
                goto stli_donestartup;
        }
        memp = (volatile cdkmem_t *) EBRDGETMEMPTR(brdp, (unsigned long) memp);
        if (memp->dtype != TYP_ASYNCTRL) {
                printk(KERN_ERR "STALLION: no slave control device found\n");
                goto stli_donestartup;
        }
        memp++;

/*
 *      Cycle through memory allocation of each port. We are guaranteed to
 *      have all ports inside the first page of slave window, so no need to
 *      change pages while reading memory map.
 */
        for (i = 1, portnr = 0; (i < nrdevs); i++, portnr++, memp++) {
                if (memp->dtype != TYP_ASYNC)
                        break;
                portp = brdp->ports[portnr];
                if (portp == (stliport_t *) NULL)
                        break;
                portp->devnr = i;
                portp->addr = memp->offset;
                portp->reqbit = (unsigned char) (0x1 << (i * 8 / nrdevs));
                portp->portidx = (unsigned char) (i / 8);
                portp->portbit = (unsigned char) (0x1 << (i % 8));
        }

        hdrp->slavereq = 0xff;

/*
 *      For each port setup a local copy of the RX and TX buffer offsets
 *      and sizes. We do this separate from the above, because we need to
 *      move the shared memory page...
 */
        for (i = 1, portnr = 0; (i < nrdevs); i++, portnr++) {
                portp = brdp->ports[portnr];
                if (portp == (stliport_t *) NULL)
                        break;
                if (portp->addr == 0)
                        break;
                ap = (volatile cdkasy_t *) EBRDGETMEMPTR(brdp, portp->addr);
                if (ap != (volatile cdkasy_t *) NULL) {
                        portp->rxsize = ap->rxq.size;
                        portp->txsize = ap->txq.size;
                        portp->rxoffset = ap->rxq.offset;
                        portp->txoffset = ap->txq.offset;
                }
        }

stli_donestartup:
        EBRDDISABLE(brdp);
        restore_flags(flags);

        if (rc == 0)
                brdp->state |= BST_STARTED;

        if (! stli_timeron) {
                stli_timeron++;
                stli_timerlist.expires = STLI_TIMEOUT;
                add_timer(&stli_timerlist);
        }

        return(rc);
}

/*****************************************************************************/

/*
 *      Probe and initialize the specified board.
 */

static int __init stli_brdinit(stlibrd_t *brdp)
{
#ifdef DEBUG
        printk(KERN_DEBUG "stli_brdinit(brdp=%x)\n", (int) brdp);
#endif

        stli_brds[brdp->brdnr] = brdp;

        switch (brdp->brdtype) {
        case BRD_ECP:
        case BRD_ECPE:
        case BRD_ECPMC:
        case BRD_ECPPCI:
                stli_initecp(brdp);
                break;
        case BRD_ONBOARD:
        case BRD_ONBOARDE:
        case BRD_ONBOARD2:
        case BRD_ONBOARD32:
        case BRD_ONBOARD2_32:
        case BRD_ONBOARDRS:
        case BRD_BRUMBY4:
        case BRD_BRUMBY8:
        case BRD_BRUMBY16:
        case BRD_STALLION:
                stli_initonb(brdp);
                break;
        case BRD_EASYIO:
        case BRD_ECH:
        case BRD_ECHMC:
        case BRD_ECHPCI:
                printk(KERN_ERR "STALLION: %s board type not supported in "
                                "this driver\n", stli_brdnames[brdp->brdtype]);
                return(ENODEV);
        default:
                printk(KERN_ERR "STALLION: board=%d is unknown board "
                                "type=%d\n", brdp->brdnr, brdp->brdtype);
                return(ENODEV);
        }

        if ((brdp->state & BST_FOUND) == 0) {
                printk(KERN_ERR "STALLION: %s board not found, board=%d "
                                "io=%x mem=%x\n",
                        stli_brdnames[brdp->brdtype], brdp->brdnr,
                        brdp->iobase, (int) brdp->memaddr);
                return(ENODEV);
        }

        stli_initports(brdp);
        printk(KERN_INFO "STALLION: %s found, board=%d io=%x mem=%x "
                "nrpanels=%d nrports=%d\n", stli_brdnames[brdp->brdtype],
                brdp->brdnr, brdp->iobase, (int) brdp->memaddr,
                brdp->nrpanels, brdp->nrports);
        return(0);
}

/*****************************************************************************/

/*
 *      Probe around trying to find where the EISA boards shared memory
 *      might be. This is a bit if hack, but it is the best we can do.
 */

static int stli_eisamemprobe(stlibrd_t *brdp)
{
        cdkecpsig_t     ecpsig, *ecpsigp;
        cdkonbsig_t     onbsig, *onbsigp;
        int             i, foundit;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_eisamemprobe(brdp=%x)\n", (int) brdp);
#endif

/*
 *      First up we reset the board, to get it into a known state. There
 *      is only 2 board types here we need to worry about. Don;t use the
 *      standard board init routine here, it programs up the shared
 *      memory address, and we don't know it yet...
 */
        if (brdp->brdtype == BRD_ECPE) {
                outb(0x1, (brdp->iobase + ECP_EIBRDENAB));
                outb(ECP_EISTOP, (brdp->iobase + ECP_EICONFR));
                udelay(10);
                outb(ECP_EIDISABLE, (brdp->iobase + ECP_EICONFR));
                udelay(500);
                stli_ecpeienable(brdp);
        } else if (brdp->brdtype == BRD_ONBOARDE) {
                outb(0x1, (brdp->iobase + ONB_EIBRDENAB));
                outb(ONB_EISTOP, (brdp->iobase + ONB_EICONFR));
                udelay(10);
                outb(ONB_EIDISABLE, (brdp->iobase + ONB_EICONFR));
                mdelay(100);
                outb(0x1, brdp->iobase);
                mdelay(1);
                stli_onbeenable(brdp);
        } else {
                return(-ENODEV);
        }

        foundit = 0;
        brdp->memsize = ECP_MEMSIZE;

/*
 *      Board shared memory is enabled, so now we have a poke around and
 *      see if we can find it.
 */
        for (i = 0; (i < stli_eisamempsize); i++) {
                brdp->memaddr = stli_eisamemprobeaddrs[i];
                brdp->membase = (void *) brdp->memaddr;
                brdp->membase = ioremap(brdp->memaddr, brdp->memsize);
                if (brdp->membase == (void *) NULL)
                        continue;

                if (brdp->brdtype == BRD_ECPE) {
                        ecpsigp = (cdkecpsig_t *) stli_ecpeigetmemptr(brdp,
                                CDK_SIGADDR, __LINE__);
                        memcpy(&ecpsig, ecpsigp, sizeof(cdkecpsig_t));
                        if (ecpsig.magic == ECP_MAGIC)
                                foundit = 1;
                } else {
                        onbsigp = (cdkonbsig_t *) stli_onbegetmemptr(brdp,
                                CDK_SIGADDR, __LINE__);
                        memcpy(&onbsig, onbsigp, sizeof(cdkonbsig_t));
                        if ((onbsig.magic0 == ONB_MAGIC0) &&
                            (onbsig.magic1 == ONB_MAGIC1) &&
                            (onbsig.magic2 == ONB_MAGIC2) &&
                            (onbsig.magic3 == ONB_MAGIC3))
                                foundit = 1;
                }

                iounmap(brdp->membase);
                if (foundit)
                        break;
        }

/*
 *      Regardless of whether we found the shared memory or not we must
 *      disable the region. After that return success or failure.
 */
        if (brdp->brdtype == BRD_ECPE)
                stli_ecpeidisable(brdp);
        else
                stli_onbedisable(brdp);

        if (! foundit) {
                brdp->memaddr = 0;
                brdp->membase = NULL;
                printk(KERN_ERR "STALLION: failed to probe shared memory "
                                "region for %s in EISA slot=%d\n",
                        stli_brdnames[brdp->brdtype], (brdp->iobase >> 12));
                return(-ENODEV);
        }
        return(0);
}

static int stli_getbrdnr(void)
{
        int i;

        for (i = 0; i < STL_MAXBRDS; i++) {
                if (!stli_brds[i]) {
                        if (i >= stli_nrbrds)
                                stli_nrbrds = i + 1;
                        return i;
                }
        }
        return -1;
}

/*****************************************************************************/

/*
 *      Probe around and try to find any EISA boards in system. The biggest
 *      problem here is finding out what memory address is associated with
 *      an EISA board after it is found. The registers of the ECPE and
 *      ONboardE are not readable - so we can't read them from there. We
 *      don't have access to the EISA CMOS (or EISA BIOS) so we don't
 *      actually have any way to find out the real value. The best we can
 *      do is go probing around in the usual places hoping we can find it.
 */

static int stli_findeisabrds(void)
{
        stlibrd_t       *brdp;
        unsigned int    iobase, eid;
        int             i;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_findeisabrds()\n");
#endif

/*
 *      Firstly check if this is an EISA system. Do this by probing for
 *      the system board EISA ID. If this is not an EISA system then
 *      don't bother going any further!
 */
        outb(0xff, 0xc80);
        if (inb(0xc80) == 0xff)
                return(0);

/*
 *      Looks like an EISA system, so go searching for EISA boards.
 */
        for (iobase = 0x1000; (iobase <= 0xc000); iobase += 0x1000) {
                outb(0xff, (iobase + 0xc80));
                eid = inb(iobase + 0xc80);
                eid |= inb(iobase + 0xc81) << 8;
                if (eid != STL_EISAID)
                        continue;

/*
 *              We have found a board. Need to check if this board was
 *              statically configured already (just in case!).
 */
                for (i = 0; (i < STL_MAXBRDS); i++) {
                        brdp = stli_brds[i];
                        if (brdp == (stlibrd_t *) NULL)
                                continue;
                        if (brdp->iobase == iobase)
                                break;
                }
                if (i < STL_MAXBRDS)
                        continue;

/*
 *              We have found a Stallion board and it is not configured already.
 *              Allocate a board structure and initialize it.
 */
                if ((brdp = stli_allocbrd()) == (stlibrd_t *) NULL)
                        return(-ENOMEM);
                if ((brdp->brdnr = stli_getbrdnr()) < 0)
                        return(-ENOMEM);
                eid = inb(iobase + 0xc82);
                if (eid == ECP_EISAID)
                        brdp->brdtype = BRD_ECPE;
                else if (eid == ONB_EISAID)
                        brdp->brdtype = BRD_ONBOARDE;
                else
                        brdp->brdtype = BRD_UNKNOWN;
                brdp->iobase = iobase;
                outb(0x1, (iobase + 0xc84));
                if (stli_eisamemprobe(brdp))
                        outb(0, (iobase + 0xc84));
                stli_brdinit(brdp);
        }

        return(0);
}

/*****************************************************************************/

/*
 *      Find the next available board number that is free.
 */

/*****************************************************************************/

#ifdef  CONFIG_PCI

/*
 *      We have a Stallion board. Allocate a board structure and
 *      initialize it. Read its IO and MEMORY resources from PCI
 *      configuration space.
 */

static int stli_initpcibrd(int brdtype, struct pci_dev *devp)
{
        stlibrd_t       *brdp;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_initpcibrd(brdtype=%d,busnr=%x,devnr=%x)\n",
                brdtype, dev->bus->number, dev->devfn);
#endif

        if (pci_enable_device(devp))
                return(-EIO);
        if ((brdp = stli_allocbrd()) == (stlibrd_t *) NULL)
                return(-ENOMEM);
        if ((brdp->brdnr = stli_getbrdnr()) < 0) {
                printk(KERN_INFO "STALLION: too many boards found, "
                        "maximum supported %d\n", STL_MAXBRDS);
                return(0);
        }
        brdp->brdtype = brdtype;

#ifdef DEBUG
        printk(KERN_DEBUG "%s(%d): BAR[]=%lx,%lx,%lx,%lx\n", __FILE__, __LINE__,
                pci_resource_start(devp, 0),
                pci_resource_start(devp, 1),
                pci_resource_start(devp, 2),
                pci_resource_start(devp, 3));
#endif

/*
 *      We have all resources from the board, so lets setup the actual
 *      board structure now.
 */
        brdp->iobase = pci_resource_start(devp, 3);
        brdp->memaddr = pci_resource_start(devp, 2);
        stli_brdinit(brdp);

        return(0);
}

/*****************************************************************************/

/*
 *      Find all Stallion PCI boards that might be installed. Initialize each
 *      one as it is found.
 */

static int stli_findpcibrds(void)
{
        struct pci_dev  *dev = NULL;
        int             rc;

#ifdef DEBUG
        printk("stli_findpcibrds()\n");
#endif

        while ((dev = pci_find_device(PCI_VENDOR_ID_STALLION,
            PCI_DEVICE_ID_ECRA, dev))) {
                if ((rc = stli_initpcibrd(BRD_ECPPCI, dev)))
                        return(rc);
        }

        return(0);
}

#endif

/*****************************************************************************/

/*
 *      Allocate a new board structure. Fill out the basic info in it.
 */

static stlibrd_t *stli_allocbrd(void)
{
        stlibrd_t       *brdp;

        brdp = (stlibrd_t *) stli_memalloc(sizeof(stlibrd_t));
        if (brdp == (stlibrd_t *) NULL) {
                printk(KERN_ERR "STALLION: failed to allocate memory "
                                "(size=%d)\n", sizeof(stlibrd_t));
                return((stlibrd_t *) NULL);
        }

        memset(brdp, 0, sizeof(stlibrd_t));
        brdp->magic = STLI_BOARDMAGIC;
        return(brdp);
}

/*****************************************************************************/

/*
 *      Scan through all the boards in the configuration and see what we
 *      can find.
 */

static int stli_initbrds(void)
{
        stlibrd_t       *brdp, *nxtbrdp;
        stlconf_t       *confp;
        int             i, j;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_initbrds()\n");
#endif

        if (stli_nrbrds > STL_MAXBRDS) {
                printk(KERN_INFO "STALLION: too many boards in configuration "
                        "table, truncating to %d\n", STL_MAXBRDS);
                stli_nrbrds = STL_MAXBRDS;
        }

/*
 *      Firstly scan the list of static boards configured. Allocate
 *      resources and initialize the boards as found. If this is a
 *      module then let the module args override static configuration.
 */
        for (i = 0; (i < stli_nrbrds); i++) {
                confp = &stli_brdconf[i];
#ifdef MODULE
                stli_parsebrd(confp, stli_brdsp[i]);
#endif
                if ((brdp = stli_allocbrd()) == (stlibrd_t *) NULL)
                        return(-ENOMEM);
                brdp->brdnr = i;
                brdp->brdtype = confp->brdtype;
                brdp->iobase = confp->ioaddr1;
                brdp->memaddr = confp->memaddr;
                stli_brdinit(brdp);
        }

/*
 *      Static configuration table done, so now use dynamic methods to
 *      see if any more boards should be configured.
 */
#ifdef MODULE
        stli_argbrds();
#endif
        if (STLI_EISAPROBE)
                stli_findeisabrds();
#ifdef CONFIG_PCI
        stli_findpcibrds();
#endif

/*
 *      All found boards are initialized. Now for a little optimization, if
 *      no boards are sharing the "shared memory" regions then we can just
 *      leave them all enabled. This is in fact the usual case.
 */
        stli_shared = 0;
        if (stli_nrbrds > 1) {
                for (i = 0; (i < stli_nrbrds); i++) {
                        brdp = stli_brds[i];
                        if (brdp == (stlibrd_t *) NULL)
                                continue;
                        for (j = i + 1; (j < stli_nrbrds); j++) {
                                nxtbrdp = stli_brds[j];
                                if (nxtbrdp == (stlibrd_t *) NULL)
                                        continue;
                                if ((brdp->membase >= nxtbrdp->membase) &&
                                    (brdp->membase <= (nxtbrdp->membase +
                                    nxtbrdp->memsize - 1))) {
                                        stli_shared++;
                                        break;
                                }
                        }
                }
        }

        if (stli_shared == 0) {
                for (i = 0; (i < stli_nrbrds); i++) {
                        brdp = stli_brds[i];
                        if (brdp == (stlibrd_t *) NULL)
                                continue;
                        if (brdp->state & BST_FOUND) {
                                EBRDENABLE(brdp);
                                brdp->enable = NULL;
                                brdp->disable = NULL;
                        }
                }
        }

        return(0);
}

/*****************************************************************************/

/*
 *      Code to handle an "staliomem" read operation. This device is the 
 *      contents of the board shared memory. It is used for down loading
 *      the slave image (and debugging :-)
 */

static ssize_t stli_memread(struct file *fp, char __user *buf, size_t count, loff_t *offp)
{
        unsigned long   flags;
        void            *memptr;
        stlibrd_t       *brdp;
        int             brdnr, size, n;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_memread(fp=%x,buf=%x,count=%x,offp=%x)\n",
                        (int) fp, (int) buf, count, (int) offp);
#endif

        brdnr = iminor(fp->f_dentry->d_inode);
        if (brdnr >= stli_nrbrds)
                return(-ENODEV);
        brdp = stli_brds[brdnr];
        if (brdp == (stlibrd_t *) NULL)
                return(-ENODEV);
        if (brdp->state == 0)
                return(-ENODEV);
        if (fp->f_pos >= brdp->memsize)
                return(0);

        size = MIN(count, (brdp->memsize - fp->f_pos));

        save_flags(flags);
        cli();
        EBRDENABLE(brdp);
        while (size > 0) {
                memptr = (void *) EBRDGETMEMPTR(brdp, fp->f_pos);
                n = MIN(size, (brdp->pagesize - (((unsigned long) fp->f_pos) % brdp->pagesize)));
                if (copy_to_user(buf, memptr, n)) {
                        count = -EFAULT;
                        goto out;
                }
                fp->f_pos += n;
                buf += n;
                size -= n;
        }
out:
        EBRDDISABLE(brdp);
        restore_flags(flags);

        return(count);
}

/*****************************************************************************/

/*
 *      Code to handle an "staliomem" write operation. This device is the 
 *      contents of the board shared memory. It is used for down loading
 *      the slave image (and debugging :-)
 */

static ssize_t stli_memwrite(struct file *fp, const char __user *buf, size_t count, loff_t *offp)
{
        unsigned long   flags;
        void            *memptr;
        stlibrd_t       *brdp;
        char            __user *chbuf;
        int             brdnr, size, n;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_memwrite(fp=%x,buf=%x,count=%x,offp=%x)\n",
                        (int) fp, (int) buf, count, (int) offp);
#endif

        brdnr = iminor(fp->f_dentry->d_inode);
        if (brdnr >= stli_nrbrds)
                return(-ENODEV);
        brdp = stli_brds[brdnr];
        if (brdp == (stlibrd_t *) NULL)
                return(-ENODEV);
        if (brdp->state == 0)
                return(-ENODEV);
        if (fp->f_pos >= brdp->memsize)
                return(0);

        chbuf = (char __user *) buf;
        size = MIN(count, (brdp->memsize - fp->f_pos));

        save_flags(flags);
        cli();
        EBRDENABLE(brdp);
        while (size > 0) {
                memptr = (void *) EBRDGETMEMPTR(brdp, fp->f_pos);
                n = MIN(size, (brdp->pagesize - (((unsigned long) fp->f_pos) % brdp->pagesize)));
                if (copy_from_user(memptr, chbuf, n)) {
                        count = -EFAULT;
                        goto out;
                }
                fp->f_pos += n;
                chbuf += n;
                size -= n;
        }
out:
        EBRDDISABLE(brdp);
        restore_flags(flags);

        return(count);
}

/*****************************************************************************/

/*
 *      Return the board stats structure to user app.
 */

static int stli_getbrdstats(combrd_t __user *bp)
{
        stlibrd_t       *brdp;
        int             i;

        if (copy_from_user(&stli_brdstats, bp, sizeof(combrd_t)))
                return -EFAULT;
        if (stli_brdstats.brd >= STL_MAXBRDS)
                return(-ENODEV);
        brdp = stli_brds[stli_brdstats.brd];
        if (brdp == (stlibrd_t *) NULL)
                return(-ENODEV);

        memset(&stli_brdstats, 0, sizeof(combrd_t));
        stli_brdstats.brd = brdp->brdnr;
        stli_brdstats.type = brdp->brdtype;
        stli_brdstats.hwid = 0;
        stli_brdstats.state = brdp->state;
        stli_brdstats.ioaddr = brdp->iobase;
        stli_brdstats.memaddr = brdp->memaddr;
        stli_brdstats.nrpanels = brdp->nrpanels;
        stli_brdstats.nrports = brdp->nrports;
        for (i = 0; (i < brdp->nrpanels); i++) {
                stli_brdstats.panels[i].panel = i;
                stli_brdstats.panels[i].hwid = brdp->panelids[i];
                stli_brdstats.panels[i].nrports = brdp->panels[i];
        }

        if (copy_to_user(bp, &stli_brdstats, sizeof(combrd_t)))
                return -EFAULT;
        return(0);
}

/*****************************************************************************/

/*
 *      Resolve the referenced port number into a port struct pointer.
 */

static stliport_t *stli_getport(int brdnr, int panelnr, int portnr)
{
        stlibrd_t       *brdp;
        int             i;

        if ((brdnr < 0) || (brdnr >= STL_MAXBRDS))
                return((stliport_t *) NULL);
        brdp = stli_brds[brdnr];
        if (brdp == (stlibrd_t *) NULL)
                return((stliport_t *) NULL);
        for (i = 0; (i < panelnr); i++)
                portnr += brdp->panels[i];
        if ((portnr < 0) || (portnr >= brdp->nrports))
                return((stliport_t *) NULL);
        return(brdp->ports[portnr]);
}

/*****************************************************************************/

/*
 *      Return the port stats structure to user app. A NULL port struct
 *      pointer passed in means that we need to find out from the app
 *      what port to get stats for (used through board control device).
 */

static int stli_portcmdstats(stliport_t *portp)
{
        unsigned long   flags;
        stlibrd_t       *brdp;
        int             rc;

        memset(&stli_comstats, 0, sizeof(comstats_t));

        if (portp == (stliport_t *) NULL)
                return(-ENODEV);
        brdp = stli_brds[portp->brdnr];
        if (brdp == (stlibrd_t *) NULL)
                return(-ENODEV);

        if (brdp->state & BST_STARTED) {
                if ((rc = stli_cmdwait(brdp, portp, A_GETSTATS,
                    &stli_cdkstats, sizeof(asystats_t), 1)) < 0)
                        return(rc);
        } else {
                memset(&stli_cdkstats, 0, sizeof(asystats_t));
        }

        stli_comstats.brd = portp->brdnr;
        stli_comstats.panel = portp->panelnr;
        stli_comstats.port = portp->portnr;
        stli_comstats.state = portp->state;
        stli_comstats.flags = portp->flags;

        save_flags(flags);
        cli();
        if (portp->tty != (struct tty_struct *) NULL) {
                if (portp->tty->driver_data == portp) {
                        stli_comstats.ttystate = portp->tty->flags;
                        stli_comstats.rxbuffered = portp->tty->flip.count;
                        if (portp->tty->termios != (struct termios *) NULL) {
                                stli_comstats.cflags = portp->tty->termios->c_cflag;
                                stli_comstats.iflags = portp->tty->termios->c_iflag;
                                stli_comstats.oflags = portp->tty->termios->c_oflag;
                                stli_comstats.lflags = portp->tty->termios->c_lflag;
                        }
                }
        }
        restore_flags(flags);

        stli_comstats.txtotal = stli_cdkstats.txchars;
        stli_comstats.rxtotal = stli_cdkstats.rxchars + stli_cdkstats.ringover;
        stli_comstats.txbuffered = stli_cdkstats.txringq;
        stli_comstats.rxbuffered += stli_cdkstats.rxringq;
        stli_comstats.rxoverrun = stli_cdkstats.overruns;
        stli_comstats.rxparity = stli_cdkstats.parity;
        stli_comstats.rxframing = stli_cdkstats.framing;
        stli_comstats.rxlost = stli_cdkstats.ringover;
        stli_comstats.rxbreaks = stli_cdkstats.rxbreaks;
        stli_comstats.txbreaks = stli_cdkstats.txbreaks;
        stli_comstats.txxon = stli_cdkstats.txstart;
        stli_comstats.txxoff = stli_cdkstats.txstop;
        stli_comstats.rxxon = stli_cdkstats.rxstart;
        stli_comstats.rxxoff = stli_cdkstats.rxstop;
        stli_comstats.rxrtsoff = stli_cdkstats.rtscnt / 2;
        stli_comstats.rxrtson = stli_cdkstats.rtscnt - stli_comstats.rxrtsoff;
        stli_comstats.modem = stli_cdkstats.dcdcnt;
        stli_comstats.hwid = stli_cdkstats.hwid;
        stli_comstats.signals = stli_mktiocm(stli_cdkstats.signals);

        return(0);
}

/*****************************************************************************/

/*
 *      Return the port stats structure to user app. A NULL port struct
 *      pointer passed in means that we need to find out from the app
 *      what port to get stats for (used through board control device).
 */

static int stli_getportstats(stliport_t *portp, comstats_t __user *cp)
{
        stlibrd_t       *brdp;
        int             rc;

        if (!portp) {
                if (copy_from_user(&stli_comstats, cp, sizeof(comstats_t)))
                        return -EFAULT;
                portp = stli_getport(stli_comstats.brd, stli_comstats.panel,
                        stli_comstats.port);
                if (!portp)
                        return -ENODEV;
        }

        brdp = stli_brds[portp->brdnr];
        if (!brdp)
                return -ENODEV;

        if ((rc = stli_portcmdstats(portp)) < 0)
                return rc;

        return copy_to_user(cp, &stli_comstats, sizeof(comstats_t)) ?
                        -EFAULT : 0;
}

/*****************************************************************************/

/*
 *      Clear the port stats structure. We also return it zeroed out...
 */

static int stli_clrportstats(stliport_t *portp, comstats_t __user *cp)
{
        stlibrd_t       *brdp;
        int             rc;

        if (!portp) {
                if (copy_from_user(&stli_comstats, cp, sizeof(comstats_t)))
                        return -EFAULT;
                portp = stli_getport(stli_comstats.brd, stli_comstats.panel,
                        stli_comstats.port);
                if (!portp)
                        return -ENODEV;
        }

        brdp = stli_brds[portp->brdnr];
        if (!brdp)
                return -ENODEV;

        if (brdp->state & BST_STARTED) {
                if ((rc = stli_cmdwait(brdp, portp, A_CLEARSTATS, NULL, 0, 0)) < 0)
                        return rc;
        }

        memset(&stli_comstats, 0, sizeof(comstats_t));
        stli_comstats.brd = portp->brdnr;
        stli_comstats.panel = portp->panelnr;
        stli_comstats.port = portp->portnr;

        if (copy_to_user(cp, &stli_comstats, sizeof(comstats_t)))
                return -EFAULT;
        return 0;
}

/*****************************************************************************/

/*
 *      Return the entire driver ports structure to a user app.
 */

static int stli_getportstruct(stliport_t __user *arg)
{
        stliport_t      *portp;

        if (copy_from_user(&stli_dummyport, arg, sizeof(stliport_t)))
                return -EFAULT;
        portp = stli_getport(stli_dummyport.brdnr, stli_dummyport.panelnr,
                 stli_dummyport.portnr);
        if (!portp)
                return -ENODEV;
        if (copy_to_user(arg, portp, sizeof(stliport_t)))
                return -EFAULT;
        return 0;
}

/*****************************************************************************/

/*
 *      Return the entire driver board structure to a user app.
 */

static int stli_getbrdstruct(stlibrd_t __user *arg)
{
        stlibrd_t       *brdp;

        if (copy_from_user(&stli_dummybrd, arg, sizeof(stlibrd_t)))
                return -EFAULT;
        if ((stli_dummybrd.brdnr < 0) || (stli_dummybrd.brdnr >= STL_MAXBRDS))
                return -ENODEV;
        brdp = stli_brds[stli_dummybrd.brdnr];
        if (!brdp)
                return -ENODEV;
        if (copy_to_user(arg, brdp, sizeof(stlibrd_t)))
                return -EFAULT;
        return 0;
}

/*****************************************************************************/

/*
 *      The "staliomem" device is also required to do some special operations on
 *      the board. We need to be able to send an interrupt to the board,
 *      reset it, and start/stop it.
 */

static int stli_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, unsigned long arg)
{
        stlibrd_t       *brdp;
        int             brdnr, rc, done;
        void __user *argp = (void __user *)arg;

#ifdef DEBUG
        printk(KERN_DEBUG "stli_memioctl(ip=%x,fp=%x,cmd=%x,arg=%x)\n",
                        (int) ip, (int) fp, cmd, (int) arg);
#endif

/*
 *      First up handle the board independent ioctls.
 */
        done = 0;
        rc = 0;

        switch (cmd) {
        case COM_GETPORTSTATS:
                rc = stli_getportstats(NULL, argp);
                done++;
                break;
        case COM_CLRPORTSTATS:
                rc = stli_clrportstats(NULL, argp);
                done++;
                break;
        case COM_GETBRDSTATS:
                rc = stli_getbrdstats(argp);
                done++;
                break;
        case COM_READPORT:
                rc = stli_getportstruct(argp);
                done++;
                break;
        case COM_READBOARD:
                rc = stli_getbrdstruct(argp);
                done++;
                break;
        }

        if (done)
                return(rc);

/*
 *      Now handle the board specific ioctls. These all depend on the
 *      minor number of the device they were called from.
 */
        brdnr = iminor(ip);
        if (brdnr >= STL_MAXBRDS)
                return(-ENODEV);
        brdp = stli_brds[brdnr];
        if (!brdp)
                return(-ENODEV);
        if (brdp->state == 0)
                return(-ENODEV);

        switch (cmd) {
        case STL_BINTR:
                EBRDINTR(brdp);
                break;
        case STL_BSTART:
                rc = stli_startbrd(brdp);
                break;
        case STL_BSTOP:
                brdp->state &= ~BST_STARTED;
                break;
        case STL_BRESET:
                brdp->state &= ~BST_STARTED;
                EBRDRESET(brdp);
                if (stli_shared == 0) {
                        if (brdp->reenable != NULL)
                                (* brdp->reenable)(brdp);
                }
                break;
        default:
                rc = -ENOIOCTLCMD;
                break;
        }

        return(rc);
}

static struct tty_operations stli_ops = {
        .open = stli_open,
        .close = stli_close,
        .write = stli_write,
        .put_char = stli_putchar,
        .flush_chars = stli_flushchars,
        .write_room = stli_writeroom,
        .chars_in_buffer = stli_charsinbuffer,
        .ioctl = stli_ioctl,
        .set_termios = stli_settermios,
        .throttle = stli_throttle,
        .unthrottle = stli_unthrottle,
        .stop = stli_stop,
        .start = stli_start,
        .hangup = stli_hangup,
        .flush_buffer = stli_flushbuffer,
        .break_ctl = stli_breakctl,
        .wait_until_sent = stli_waituntilsent,
        .send_xchar = stli_sendxchar,
        .read_proc = stli_readproc,
        .tiocmget = stli_tiocmget,
        .tiocmset = stli_tiocmset,
};

/*****************************************************************************/

int __init stli_init(void)
{
        int i;
        printk(KERN_INFO "%s: version %s\n", stli_drvtitle, stli_drvversion);

        stli_initbrds();

        stli_serial = alloc_tty_driver(STL_MAXBRDS * STL_MAXPORTS);
        if (!stli_serial)
                return -ENOMEM;

/*
 *      Allocate a temporary write buffer.
 */
        stli_tmpwritebuf = (char *) stli_memalloc(STLI_TXBUFSIZE);
        if (stli_tmpwritebuf == (char *) NULL)
                printk(KERN_ERR "STALLION: failed to allocate memory "
                                "(size=%d)\n", STLI_TXBUFSIZE);
        stli_txcookbuf = stli_memalloc(STLI_TXBUFSIZE);
        if (stli_txcookbuf == (char *) NULL)
                printk(KERN_ERR "STALLION: failed to allocate memory "
                                "(size=%d)\n", STLI_TXBUFSIZE);

/*
 *      Set up a character driver for the shared memory region. We need this
 *      to down load the slave code image. Also it is a useful debugging tool.
 */
        if (register_chrdev(STL_SIOMEMMAJOR, "staliomem", &stli_fsiomem))
                printk(KERN_ERR "STALLION: failed to register serial memory "
                                "device\n");

        devfs_mk_dir("staliomem");
        istallion_class = class_create(THIS_MODULE, "staliomem");
        for (i = 0; i < 4; i++) {
                devfs_mk_cdev(MKDEV(STL_SIOMEMMAJOR, i),
                               S_IFCHR | S_IRUSR | S_IWUSR,
                               "staliomem/%d", i);
                class_device_create(istallion_class, NULL,
                                MKDEV(STL_SIOMEMMAJOR, i),
                                NULL, "staliomem%d", i);
        }

/*
 *      Set up the tty driver structure and register us as a driver.
 */
        stli_serial->owner = THIS_MODULE;
        stli_serial->driver_name = stli_drvname;
        stli_serial->name = stli_serialname;
        stli_serial->major = STL_SERIALMAJOR;
        stli_serial->minor_start = 0;
        stli_serial->type = TTY_DRIVER_TYPE_SERIAL;
        stli_serial->subtype = SERIAL_TYPE_NORMAL;
        stli_serial->init_termios = stli_deftermios;
        stli_serial->flags = TTY_DRIVER_REAL_RAW;
        tty_set_operations(stli_serial, &stli_ops);

        if (tty_register_driver(stli_serial)) {
                put_tty_driver(stli_serial);
                printk(KERN_ERR "STALLION: failed to register serial driver\n");
                return -EBUSY;
        }
        return(0);
}

/*****************************************************************************/