[ARM] pxa: Gumstix Verdex PCMCIA support

[linux-2.6/verdex.git] / 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.
 *
 */

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

#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/seq_file.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/device.h>
#include <linux/wait.h>
#include <linux/eisa.h>
#include <linux/ctype.h>

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

#include <linux/pci.h>

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

/*
 *      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_ONBOARDE    7
#define BRD_ECP         23
#define BRD_ECPE        24
#define BRD_ECPMC       25
#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.
 */

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

static unsigned int stli_nrbrds;

/* stli_lock must NOT be taken holding brd_lock */
static spinlock_t stli_lock;    /* TTY logic lock */
static spinlock_t brd_lock;     /* Board logic lock */

/*
 *      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;
static const struct tty_port_operations stli_port_ops;

#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 ktermios          stli_deftermios = {
        .c_cflag        = (B9600 | CS8 | CREAD | HUPCL | CLOCAL),
        .c_cc           = INIT_C_CC,
        .c_ispeed       = 9600,
        .c_ospeed       = 9600,
};

/*
 *      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 struct asystats  stli_cdkstats;

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

static DEFINE_MUTEX(stli_brdslock);
static struct stlibrd   *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 BST_PROBED      0x4

/*
 *      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",
        NULL,
        "ONboard",
        "ONboard-MC",
        "ONboard-MC",
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        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",
};

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

/*
 *      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.
 */

static struct stlibrdtype {
        char    *name;
        int     type;
} 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_param_array(board0, charp, NULL, 0);
MODULE_PARM_DESC(board0, "Board 0 config -> name[,ioaddr[,memaddr]");
module_param_array(board1, charp, NULL, 0);
MODULE_PARM_DESC(board1, "Board 1 config -> name[,ioaddr[,memaddr]");
module_param_array(board2, charp, NULL, 0);
MODULE_PARM_DESC(board2, "Board 2 config -> name[,ioaddr[,memaddr]");
module_param_array(board3, charp, NULL, 0);
MODULE_PARM_DESC(board3, "Board 3 config -> name[,ioaddr[,memaddr]");

#if STLI_EISAPROBE != 0
/*
 *      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);
#endif

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

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

static struct pci_driver stli_pcidriver;

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

/*
 *      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)

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

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

static int      stli_parsebrd(struct stlconf *confp, char **argp);
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 int      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 ktermios *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 int      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_brdinit(struct stlibrd *brdp);
static int      stli_startbrd(struct stlibrd *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(struct stlibrd *brdp, cdkhdr_t __iomem *hdrp);
static void     stli_poll(unsigned long arg);
static int      stli_hostcmd(struct stlibrd *brdp, struct stliport *portp);
static int      stli_initopen(struct tty_struct *tty, struct stlibrd *brdp, struct stliport *portp);
static int      stli_rawopen(struct stlibrd *brdp, struct stliport *portp, unsigned long arg, int wait);
static int      stli_rawclose(struct stlibrd *brdp, struct stliport *portp, unsigned long arg, int wait);
static int      stli_setport(struct tty_struct *tty);
static int      stli_cmdwait(struct stlibrd *brdp, struct stliport *portp, unsigned long cmd, void *arg, int size, int copyback);
static void     stli_sendcmd(struct stlibrd *brdp, struct stliport *portp, unsigned long cmd, void *arg, int size, int copyback);
static void     __stli_sendcmd(struct stlibrd *brdp, struct stliport *portp, unsigned long cmd, void *arg, int size, int copyback);
static void     stli_dodelaycmd(struct stliport *portp, cdkctrl_t __iomem *cp);
static void     stli_mkasyport(struct tty_struct *tty, struct stliport *portp, asyport_t *pp, struct ktermios *tiosp);
static void     stli_mkasysigs(asysigs_t *sp, int dtr, int rts);
static long     stli_mktiocm(unsigned long sigvalue);
static void     stli_read(struct stlibrd *brdp, struct stliport *portp);
static int      stli_getserial(struct stliport *portp, struct serial_struct __user *sp);
static int      stli_setserial(struct tty_struct *tty, struct serial_struct __user *sp);
static int      stli_getbrdstats(combrd_t __user *bp);
static int      stli_getportstats(struct tty_struct *tty, struct stliport *portp, comstats_t __user *cp);
static int      stli_portcmdstats(struct tty_struct *tty, struct stliport *portp);
static int      stli_clrportstats(struct stliport *portp, comstats_t __user *cp);
static int      stli_getportstruct(struct stliport __user *arg);
static int      stli_getbrdstruct(struct stlibrd __user *arg);
static struct stlibrd *stli_allocbrd(void);

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

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

static struct stliport *stli_getport(unsigned int brdnr, unsigned int panelnr, unsigned int portnr);

static int      stli_initecp(struct stlibrd *brdp);
static int      stli_initonb(struct stlibrd *brdp);
#if STLI_EISAPROBE != 0
static int      stli_eisamemprobe(struct stlibrd *brdp);
#endif
static int      stli_initports(struct stlibrd *brdp);

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

/*
 *      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 const 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;

static void stli_cleanup_ports(struct stlibrd *brdp)
{
        struct stliport *portp;
        unsigned int j;
        struct tty_struct *tty;

        for (j = 0; j < STL_MAXPORTS; j++) {
                portp = brdp->ports[j];
                if (portp != NULL) {
                        tty = tty_port_tty_get(&portp->port);
                        if (tty != NULL) {
                                tty_hangup(tty);
                                tty_kref_put(tty);
                        }
                        kfree(portp);
                }
        }
}

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

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

static int stli_parsebrd(struct stlconf *confp, char **argp)
{
        unsigned int i;
        char *sp;

        if (argp[0] == 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(KERN_WARNING "istallion: unknown board name, %s?\n", argp[0]);
                return 0;
        }

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

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

static int stli_open(struct tty_struct *tty, struct file *filp)
{
        struct stlibrd *brdp;
        struct stliport *portp;
        struct tty_port *port;
        unsigned int minordev, brdnr, portnr;
        int rc;

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

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

/*
 *      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.
 *
 *      Review - locking
 */
        tty_port_tty_set(port, tty);
        tty->driver_data = portp;
        port->count++;

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

        if ((portp->port.flags & ASYNC_INITIALIZED) == 0) {
                set_bit(ST_INITIALIZING, &portp->state);
                if ((rc = stli_initopen(tty, brdp, portp)) >= 0) {
                        /* Locking */
                        port->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;
        }
        return tty_port_block_til_ready(&portp->port, tty, filp);
}

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

static void stli_close(struct tty_struct *tty, struct file *filp)
{
        struct stlibrd *brdp;
        struct stliport *portp;
        struct tty_port *port;
        unsigned long flags;

        portp = tty->driver_data;
        if (portp == NULL)
                return;
        port = &portp->port;

        if (tty_port_close_start(port, tty, filp) == 0)
                return;

/*
 *      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.
 */
        spin_lock_irqsave(&stli_lock, flags);
        if (tty == stli_txcooktty)
                stli_flushchars(tty);
        spin_unlock_irqrestore(&stli_lock, flags);

        /* We end up doing this twice for the moment. This needs looking at
           eventually. Note we still use portp->closing_wait as a result */
        if (portp->closing_wait != ASYNC_CLOSING_WAIT_NONE)
                tty_wait_until_sent(tty, portp->closing_wait);

        /* FIXME: port locking here needs attending to */
        port->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);
        tty_ldisc_flush(tty);
        set_bit(ST_DOFLUSHRX, &portp->state);
        stli_flushbuffer(tty);

        tty_port_close_end(port, tty);
        tty_port_tty_set(port, NULL);
}

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

/*
 *      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(struct tty_struct *tty,
                                struct stlibrd *brdp, struct stliport *portp)
{
        asynotify_t nt;
        asyport_t aport;
        int rc;

        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;

        stli_mkasyport(tty, 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(struct stlibrd *brdp, struct stliport *portp, unsigned long arg, int wait)
{
        cdkhdr_t __iomem *hdrp;
        cdkctrl_t __iomem *cp;
        unsigned char __iomem *bits;
        unsigned long flags;
        int rc;

/*
 *      Send a message to the slave to open this port.
 */

/*
 *      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)) {
                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.
 */
        spin_lock_irqsave(&brd_lock, flags);
        EBRDENABLE(brdp);
        cp = &((cdkasy_t __iomem *) EBRDGETMEMPTR(brdp, portp->addr))->ctrl;
        writel(arg, &cp->openarg);
        writeb(1, &cp->open);
        hdrp = (cdkhdr_t __iomem *) EBRDGETMEMPTR(brdp, CDK_CDKADDR);
        bits = ((unsigned char __iomem *) hdrp) + brdp->slaveoffset +
                portp->portidx;
        writeb(readb(bits) | portp->portbit, bits);
        EBRDDISABLE(brdp);

        if (wait == 0) {
                spin_unlock_irqrestore(&brd_lock, 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);
        spin_unlock_irqrestore(&brd_lock, flags);

        wait_event_interruptible(portp->raw_wait,
                        !test_bit(ST_OPENING, &portp->state));
        if (signal_pending(current))
                rc = -ERESTARTSYS;

        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(struct stlibrd *brdp, struct stliport *portp, unsigned long arg, int wait)
{
        cdkhdr_t __iomem *hdrp;
        cdkctrl_t __iomem *cp;
        unsigned char __iomem *bits;
        unsigned long flags;
        int rc;

/*
 *      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)) {
                        return -ERESTARTSYS;
                }
        }

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

        set_bit(ST_CLOSING, &portp->state);
        spin_unlock_irqrestore(&brd_lock, flags);

        if (wait == 0)
                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;

        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(struct stlibrd *brdp, struct stliport *portp, unsigned long cmd, void *arg, int size, int copyback)
{
        wait_event_interruptible(portp->raw_wait,
                        !test_bit(ST_CMDING, &portp->state));
        if (signal_pending(current))
                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))
                return -ERESTARTSYS;

        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(struct tty_struct *tty)
{
        struct stliport *portp = tty->driver_data;
        struct stlibrd *brdp;
        asyport_t aport;

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

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

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

static int stli_carrier_raised(struct tty_port *port)
{
        struct stliport *portp = container_of(port, struct stliport, port);
        return (portp->sigs & TIOCM_CD) ? 1 : 0;
}

static void stli_dtr_rts(struct tty_port *port, int on)
{
        struct stliport *portp = container_of(port, struct stliport, port);
        struct stlibrd *brdp = stli_brds[portp->brdnr];
        stli_mkasysigs(&portp->asig, on, on);
        if (stli_cmdwait(brdp, portp, A_SETSIGNALS, &portp->asig,
                sizeof(asysigs_t), 0) < 0)
                        printk(KERN_WARNING "istallion: dtr set failed.\n");
}


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

/*
 *      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)
{
        cdkasy_t __iomem *ap;
        cdkhdr_t __iomem *hdrp;
        unsigned char __iomem *bits;
        unsigned char __iomem *shbuf;
        unsigned char *chbuf;
        struct stliport *portp;
        struct stlibrd *brdp;
        unsigned int len, stlen, head, tail, size;
        unsigned long flags;

        if (tty == stli_txcooktty)
                stli_flushchars(tty);
        portp = tty->driver_data;
        if (portp == NULL)
                return 0;
        if (portp->brdnr >= stli_nrbrds)
                return 0;
        brdp = stli_brds[portp->brdnr];
        if (brdp == NULL)
                return 0;
        chbuf = (unsigned char *) buf;

/*
 *      All data is now local, shove as much as possible into shared memory.
 */
        spin_lock_irqsave(&brd_lock, flags);
        EBRDENABLE(brdp);
        ap = (cdkasy_t __iomem *) EBRDGETMEMPTR(brdp, portp->addr);
        head = (unsigned int) readw(&ap->txq.head);
        tail = (unsigned int) readw(&ap->txq.tail);
        if (tail != ((unsigned int) readw(&ap->txq.tail)))
                tail = (unsigned int) readw(&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, (unsigned int)count);
        count = 0;
        shbuf = (char __iomem *) EBRDGETMEMPTR(brdp, portp->txoffset);

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

        ap = (cdkasy_t __iomem *) EBRDGETMEMPTR(brdp, portp->addr);
        writew(head, &ap->txq.head);
        if (test_bit(ST_TXBUSY, &portp->state)) {
                if (readl(&ap->changed.data) & DT_TXEMPTY)
                        writel(readl(&ap->changed.data) & ~DT_TXEMPTY, &ap->changed.data);
        }
        hdrp = (cdkhdr_t __iomem *) EBRDGETMEMPTR(brdp, CDK_CDKADDR);
        bits = ((unsigned char __iomem *) hdrp) + brdp->slaveoffset +
                portp->portidx;
        writeb(readb(bits) | portp->portbit, bits);
        set_bit(ST_TXBUSY, &portp->state);
        EBRDDISABLE(brdp);
        spin_unlock_irqrestore(&brd_lock, 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 int stli_putchar(struct tty_struct *tty, unsigned char ch)
{
        if (tty != stli_txcooktty) {
                if (stli_txcooktty != NULL)
                        stli_flushchars(stli_txcooktty);
                stli_txcooktty = tty;
        }

        stli_txcookbuf[stli_txcooksize++] = ch;
        return 0;
}

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

/*
 *      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)
{
        cdkhdr_t __iomem *hdrp;
        unsigned char __iomem *bits;
        cdkasy_t __iomem *ap;
        struct tty_struct *cooktty;
        struct stliport *portp;
        struct stlibrd *brdp;
        unsigned int len, stlen, head, tail, size, count, cooksize;
        unsigned char *buf;
        unsigned char __iomem *shbuf;
        unsigned long flags;

        cooksize = stli_txcooksize;
        cooktty = stli_txcooktty;
        stli_txcooksize = 0;
        stli_txcookrealsize = 0;
        stli_txcooktty = NULL;

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

        portp = tty->driver_data;
        if (portp == NULL)
                return;
        if (portp->brdnr >= stli_nrbrds)
                return;
        brdp = stli_brds[portp->brdnr];
        if (brdp == NULL)
                return;

        spin_lock_irqsave(&brd_lock, flags);
        EBRDENABLE(brdp);

        ap = (cdkasy_t __iomem *) EBRDGETMEMPTR(brdp, portp->addr);
        head = (unsigned int) readw(&ap->txq.head);
        tail = (unsigned int) readw(&ap->txq.tail);
        if (tail != ((unsigned int) readw(&ap->txq.tail)))
                tail = (unsigned int) readw(&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 = EBRDGETMEMPTR(brdp, portp->txoffset);
        buf = stli_txcookbuf;

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

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

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

        EBRDDISABLE(brdp);
        spin_unlock_irqrestore(&brd_lock, flags);
}

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

static int stli_writeroom(struct tty_struct *tty)
{
        cdkasyrq_t __iomem *rp;
        struct stliport *portp;
        struct stlibrd *brdp;
        unsigned int head, tail, len;
        unsigned long flags;

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

        portp = tty->driver_data;
        if (portp == NULL)
                return 0;
        if (portp->brdnr >= stli_nrbrds)
                return 0;
        brdp = stli_brds[portp->brdnr];
        if (brdp == NULL)
                return 0;

        spin_lock_irqsave(&brd_lock, flags);
        EBRDENABLE(brdp);
        rp = &((cdkasy_t __iomem *) EBRDGETMEMPTR(brdp, portp->addr))->txq;
        head = (unsigned int) readw(&rp->head);
        tail = (unsigned int) readw(&rp->tail);
        if (tail != ((unsigned int) readw(&rp->tail)))
                tail = (unsigned int) readw(&rp->tail);
        len = (head >= tail) ? (portp->txsize - (head - tail)) : (tail - head);
        len--;
        EBRDDISABLE(brdp);
        spin_unlock_irqrestore(&brd_lock, 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)
{
        cdkasyrq_t __iomem *rp;
        struct stliport *portp;
        struct stlibrd *brdp;
        unsigned int head, tail, len;
        unsigned long flags;

        if (tty == stli_txcooktty)
                stli_flushchars(tty);
        portp = tty->driver_data;
        if (portp == NULL)
                return 0;
        if (portp->brdnr >= stli_nrbrds)
                return 0;
        brdp = stli_brds[portp->brdnr];
        if (brdp == NULL)
                return 0;

        spin_lock_irqsave(&brd_lock, flags);
        EBRDENABLE(brdp);
        rp = &((cdkasy_t __iomem *) EBRDGETMEMPTR(brdp, portp->addr))->txq;
        head = (unsigned int) readw(&rp->head);
        tail = (unsigned int) readw(&rp->tail);
        if (tail != ((unsigned int) readw(&rp->tail)))
                tail = (unsigned int) readw(&rp->tail);
        len = (head >= tail) ? (head - tail) : (portp->txsize - (tail - head));
        if ((len == 0) && test_bit(ST_TXBUSY, &portp->state))
                len = 1;
        EBRDDISABLE(brdp);
        spin_unlock_irqrestore(&brd_lock, flags);

        return len;
}

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

/*
 *      Generate the serial struct info.
 */

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

        memset(&sio, 0, sizeof(struct serial_struct));
        sio.type = PORT_UNKNOWN;
        sio.line = portp->portnr;
        sio.irq = 0;
        sio.flags = portp->port.flags;
        sio.baud_base = portp->baud_base;
        sio.close_delay = portp->port.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 != 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(struct tty_struct *tty, struct serial_struct __user *sp)
{
        struct serial_struct sio;
        int rc;
        struct stliport *portp = tty->driver_data;

        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->port.close_delay) ||
                    ((sio.flags & ~ASYNC_USR_MASK) !=
                    (portp->port.flags & ~ASYNC_USR_MASK)))
                        return -EPERM;
        } 

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

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

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

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

        if (portp == NULL)
                return -ENODEV;
        if (portp->brdnr >= stli_nrbrds)
                return 0;
        brdp = stli_brds[portp->brdnr];
        if (brdp == 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)
{
        struct stliport *portp = tty->driver_data;
        struct stlibrd *brdp;
        int rts = -1, dtr = -1;

        if (portp == NULL)
                return -ENODEV;
        if (portp->brdnr >= stli_nrbrds)
                return 0;
        brdp = stli_brds[portp->brdnr];
        if (brdp == 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)
{
        struct stliport *portp;
        struct stlibrd *brdp;
        int rc;
        void __user *argp = (void __user *)arg;

        portp = tty->driver_data;
        if (portp == NULL)
                return -ENODEV;
        if (portp->brdnr >= stli_nrbrds)
                return 0;
        brdp = stli_brds[portp->brdnr];
        if (brdp == 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 TIOCGSERIAL:
                rc = stli_getserial(portp, argp);
                break;
        case TIOCSSERIAL:
                rc = stli_setserial(tty, 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(tty);
                break;
        case COM_GETPORTSTATS:
                rc = stli_getportstats(tty, 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 ktermios *old)
{
        struct stliport *portp;
        struct stlibrd *brdp;
        struct ktermios *tiosp;
        asyport_t aport;

        portp = tty->driver_data;
        if (portp == NULL)
                return;
        if (portp->brdnr >= stli_nrbrds)
                return;
        brdp = stli_brds[portp->brdnr];
        if (brdp == NULL)
                return;

        tiosp = tty->termios;

        stli_mkasyport(tty, 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->port.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)
{
        struct stliport *portp = tty->driver_data;
        if (portp == 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)
{
        struct stliport *portp = tty->driver_data;
        if (portp == NULL)
                return;
        clear_bit(ST_RXSTOP, &portp->state);
}

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

/*
 *      Stop the transmitter.
 */

static void stli_stop(struct tty_struct *tty)
{
}

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

/*
 *      Start the transmitter again.
 */

static void stli_start(struct tty_struct *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)
{
        struct stliport *portp;
        struct stlibrd *brdp;
        struct tty_port *port;
        unsigned long flags;

        portp = tty->driver_data;
        if (portp == NULL)
                return;
        if (portp->brdnr >= stli_nrbrds)
                return;
        brdp = stli_brds[portp->brdnr];
        if (brdp == NULL)
                return;
        port = &portp->port;

        spin_lock_irqsave(&port->lock, flags);
        port->flags &= ~ASYNC_INITIALIZED;
        spin_unlock_irqrestore(&port->lock, flags);

        if (!test_bit(ST_CLOSING, &portp->state))
                stli_rawclose(brdp, portp, 0, 0);

        spin_lock_irqsave(&stli_lock, flags);
        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);
                }
        }

        clear_bit(ST_TXBUSY, &portp->state);
        clear_bit(ST_RXSTOP, &portp->state);
        set_bit(TTY_IO_ERROR, &tty->flags);
        spin_unlock_irqrestore(&stli_lock, flags);

        tty_port_hangup(port);
}

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

/*
 *      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)
{
        struct stliport *portp;
        struct stlibrd *brdp;
        unsigned long ftype, flags;

        portp = tty->driver_data;
        if (portp == NULL)
                return;
        if (portp->brdnr >= stli_nrbrds)
                return;
        brdp = stli_brds[portp->brdnr];
        if (brdp == NULL)
                return;

        spin_lock_irqsave(&brd_lock, flags);
        if (tty == stli_txcooktty) {
                stli_txcooktty = 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(u32), 0);
        }
        spin_unlock_irqrestore(&brd_lock, flags);
        tty_wakeup(tty);
}

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

static int stli_breakctl(struct tty_struct *tty, int state)
{
        struct stlibrd  *brdp;
        struct stliport *portp;
        long            arg;

        portp = tty->driver_data;
        if (portp == NULL)
                return -EINVAL;
        if (portp->brdnr >= stli_nrbrds)
                return -EINVAL;
        brdp = stli_brds[portp->brdnr];
        if (brdp == NULL)
                return -EINVAL;

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

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

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

        portp = tty->driver_data;
        if (portp == 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)
{
        struct stlibrd  *brdp;
        struct stliport *portp;
        asyctrl_t       actrl;

        portp = tty->driver_data;
        if (portp == NULL)
                return;
        if (portp->brdnr >= stli_nrbrds)
                return;
        brdp = stli_brds[portp->brdnr];
        if (brdp == 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);
}

static void stli_portinfo(struct seq_file *m, struct stlibrd *brdp, struct stliport *portp, int portnr)
{
        char *uart;
        int rc;

        rc = stli_portcmdstats(NULL, 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;
                }
        }
        seq_printf(m, "%d: uart:%s ", portnr, uart);

        if ((brdp->state & BST_STARTED) && (rc >= 0)) {
                char sep;

                seq_printf(m, "tx:%d rx:%d", (int) stli_comstats.txtotal,
                        (int) stli_comstats.rxtotal);

                if (stli_comstats.rxframing)
                        seq_printf(m, " fe:%d",
                                (int) stli_comstats.rxframing);
                if (stli_comstats.rxparity)
                        seq_printf(m, " pe:%d",
                                (int) stli_comstats.rxparity);
                if (stli_comstats.rxbreaks)
                        seq_printf(m, " brk:%d",
                                (int) stli_comstats.rxbreaks);
                if (stli_comstats.rxoverrun)
                        seq_printf(m, " oe:%d",
                                (int) stli_comstats.rxoverrun);

                sep = ' ';
                if (stli_comstats.signals & TIOCM_RTS) {
                        seq_printf(m, "%c%s", sep, "RTS");
                        sep = '|';
                }
                if (stli_comstats.signals & TIOCM_CTS) {
                        seq_printf(m, "%c%s", sep, "CTS");
                        sep = '|';
                }
                if (stli_comstats.signals & TIOCM_DTR) {
                        seq_printf(m, "%c%s", sep, "DTR");
                        sep = '|';
                }
                if (stli_comstats.signals & TIOCM_CD) {
                        seq_printf(m, "%c%s", sep, "DCD");
                        sep = '|';
                }
                if (stli_comstats.signals & TIOCM_DSR) {
                        seq_printf(m, "%c%s", sep, "DSR");
                        sep = '|';
                }
        }
        seq_putc(m, '\n');
}

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

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

static int stli_proc_show(struct seq_file *m, void *v)
{
        struct stlibrd *brdp;
        struct stliport *portp;
        unsigned int brdnr, portnr, totalport;

        totalport = 0;

        seq_printf(m, "%s: version %s\n", stli_drvtitle, stli_drvversion);

/*
 *      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 == NULL)
                        continue;
                if (brdp->state == 0)
                        continue;

                totalport = brdnr * STL_MAXPORTS;
                for (portnr = 0; (portnr < brdp->nrports); portnr++,
                    totalport++) {
                        portp = brdp->ports[portnr];
                        if (portp == NULL)
                                continue;
                        stli_portinfo(m, brdp, portp, totalport);
                }
        }
        return 0;
}

static int stli_proc_open(struct inode *inode, struct file *file)
{
        return single_open(file, stli_proc_show, NULL);
}

static const struct file_operations stli_proc_fops = {
        .owner          = THIS_MODULE,
        .open           = stli_proc_open,
        .read           = seq_read,
        .llseek         = seq_lseek,
        .release        = single_release,
};

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

/*
 *      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.
 *
 *      The caller must hold the brd_lock (see also stli_sendcmd the usual
 *      entry point)
 */

static void __stli_sendcmd(struct stlibrd *brdp, struct stliport *portp, unsigned long cmd, void *arg, int size, int copyback)
{
        cdkhdr_t __iomem *hdrp;
        cdkctrl_t __iomem *cp;
        unsigned char __iomem *bits;

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

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

static void stli_sendcmd(struct stlibrd *brdp, struct stliport *portp, unsigned long cmd, void *arg, int size, int copyback)
{
        unsigned long           flags;

        spin_lock_irqsave(&brd_lock, flags);
        __stli_sendcmd(brdp, portp, cmd, arg, size, copyback);
        spin_unlock_irqrestore(&brd_lock, 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(struct stlibrd *brdp, struct stliport *portp)
{
        cdkasyrq_t __iomem *rp;
        char __iomem *shbuf;
        struct tty_struct       *tty;
        unsigned int head, tail, size;
        unsigned int len, stlen;

        if (test_bit(ST_RXSTOP, &portp->state))
                return;
        tty = tty_port_tty_get(&portp->port);
        if (tty == NULL)
                return;

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

        len = tty_buffer_request_room(tty, len);

        shbuf = (char __iomem *) EBRDGETMEMPTR(brdp, portp->rxoffset);

        while (len > 0) {
                unsigned char *cptr;

                stlen = min(len, stlen);
                tty_prepare_flip_string(tty, &cptr, stlen);
                memcpy_fromio(cptr, shbuf + tail, stlen);
                len -= stlen;
                tail += stlen;
                if (tail >= size) {
                        tail = 0;
                        stlen = head;
                }
        }
        rp = &((cdkasy_t __iomem *) EBRDGETMEMPTR(brdp, portp->addr))->rxq;
        writew(tail, &rp->tail);

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

        tty_schedule_flip(tty);
        tty_kref_put(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(struct stliport *portp, cdkctrl_t __iomem *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_toio((void __iomem *) &(cp->args[0]), (void *) &portp->asig,
                        sizeof(asysigs_t));
                writel(0, &cp->status);
                writel(cmd, &cp->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_toio((void __iomem *) &(cp->args[0]), (void *) &cmd, sizeof(int));
                writel(0, &cp->status);
                writel(A_FLUSH, &cp->cmd);
                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(struct stlibrd *brdp, struct stliport *portp)
{
        cdkasy_t __iomem *ap;
        cdkctrl_t __iomem *cp;
        struct tty_struct *tty;
        asynotify_t nt;
        unsigned long oldsigs;
        int rc, donerx;

        ap = (cdkasy_t __iomem *) 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 = readl(&cp->openarg);
                if (readb(&cp->open) == 0 && rc != 0) {
                        if (rc > 0)
                                rc--;
                        writel(0, &cp->openarg);
                        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) readl(&cp->closearg);
                if (readb(&cp->close) == 0 && rc != 0) {
                        if (rc > 0)
                                rc--;
                        writel(0, &cp->closearg);
                        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 = readl(&cp->status);
                if (readl(&cp->cmd) == 0 && rc != 0) {
                        if (rc > 0)
                                rc--;
                        if (portp->argp != NULL) {
                                memcpy_fromio(portp->argp, (void __iomem *) &(cp->args[0]),
                                        portp->argsize);
                                portp->argp = NULL;
                        }
                        writel(0, &cp->status);
                        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 = tty_port_tty_get(&portp->port);

                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->port.open_wait);
                        if ((oldsigs & TIOCM_CD) &&
                            ((portp->sigs & TIOCM_CD) == 0)) {
                                if (portp->port.flags & ASYNC_CHECK_CD) {
                                        if (tty)
                                                tty_hangup(tty);
                                }
                        }
                }

                if (nt.data & DT_TXEMPTY)
                        clear_bit(ST_TXBUSY, &portp->state);
                if (nt.data & (DT_TXEMPTY | DT_TXLOW)) {
                        if (tty != NULL) {
                                tty_wakeup(tty);
                                EBRDENABLE(brdp);
                        }
                }

                if ((nt.data & DT_RXBREAK) && (portp->rxmarkmsk & BRKINT)) {
                        if (tty != NULL) {
                                tty_insert_flip_char(tty, 0, TTY_BREAK);
                                if (portp->port.flags & ASYNC_SAK) {
                                        do_SAK(tty);
                                        EBRDENABLE(brdp);
                                }
                                tty_schedule_flip(tty);
                        }
                }
                tty_kref_put(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(struct stlibrd *brdp, cdkhdr_t __iomem *hdrp)
{
        struct stliport *portp;
        unsigned char hostbits[(STL_MAXCHANS / 8) + 1];
        unsigned char slavebits[(STL_MAXCHANS / 8) + 1];
        unsigned char __iomem *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_fromio(&hostbits[0], (((unsigned char __iomem *) 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 = (cdkhdr_t __iomem *) EBRDGETMEMPTR(brdp, CDK_CDKADDR);
                slavep = ((unsigned char __iomem *) hdrp) + brdp->slaveoffset;
                for (bitpos = 0; (bitpos < bitsize); bitpos++) {
                        if (readb(slavebits + bitpos))
                                writeb(readb(slavep + bitpos) & ~slavebits[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)
{
        cdkhdr_t __iomem *hdrp;
        struct stlibrd *brdp;
        unsigned int brdnr;

        mod_timer(&stli_timerlist, STLI_TIMEOUT);

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

                spin_lock(&brd_lock);
                EBRDENABLE(brdp);
                hdrp = (cdkhdr_t __iomem *) EBRDGETMEMPTR(brdp, CDK_CDKADDR);
                if (readb(&hdrp->hostreq))
                        stli_brdpoll(brdp, hdrp);
                EBRDDISABLE(brdp);
                spin_unlock(&brd_lock);
        }
}

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

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

static void stli_mkasyport(struct tty_struct *tty, struct stliport *portp,
                                asyport_t *pp, struct ktermios *tiosp)
{
        memset(pp, 0, sizeof(asyport_t));

/*
 *      Start of by setting the baud, char size, parity and stop bit info.
 */
        pp->baudout = tty_get_baud_rate(tty);
        if ((tiosp->c_cflag & CBAUD) == B38400) {
                if ((portp->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
                        pp->baudout = 57600;
                else if ((portp->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
                        pp->baudout = 115200;
                else if ((portp->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
                        pp->baudout = 230400;
                else if ((portp->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
                        pp->baudout = 460800;
                else if ((portp->port.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->port.flags &= ~ASYNC_CHECK_CD;
        else
                portp->port.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)
{
        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 = 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(struct stlibrd *brdp)
{
        struct stliport *portp;
        unsigned int i, panelnr, panelport;

        for (i = 0, panelnr = 0, panelport = 0; (i < brdp->nrports); i++) {
                portp = kzalloc(sizeof(struct stliport), GFP_KERNEL);
                if (!portp) {
                        printk(KERN_WARNING "istallion: failed to allocate port structure\n");
                        continue;
                }
                tty_port_init(&portp->port);
                portp->port.ops = &stli_port_ops;
                portp->magic = STLI_PORTMAGIC;
                portp->portnr = i;
                portp->brdnr = brdp->brdnr;
                portp->panelnr = panelnr;
                portp->baud_base = STL_BAUDBASE;
                portp->port.close_delay = STL_CLOSEDELAY;
                portp->closing_wait = 30 * HZ;
                init_waitqueue_head(&portp->port.open_wait);
                init_waitqueue_head(&portp->port.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(struct stlibrd *brdp)
{
        unsigned long   memconf;

        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(struct stlibrd *brdp)
{       
        outb(ECP_ATENABLE, (brdp->iobase + ECP_ATCONFR));
}

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

static void stli_ecpdisable(struct stlibrd *brdp)
{       
        outb(ECP_ATDISABLE, (brdp->iobase + ECP_ATCONFR));
}

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

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

        if (offset > brdp->memsize) {
                printk(KERN_ERR "istallion: 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(struct stlibrd *brdp)
{       
        outb(ECP_ATSTOP, (brdp->iobase + ECP_ATCONFR));
        udelay(10);
        outb(ECP_ATDISABLE, (brdp->iobase + ECP_ATCONFR));
        udelay(500);
}

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

static void stli_ecpintr(struct stlibrd *brdp)
{       
        outb(0x1, brdp->iobase);
}

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

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

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

        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(struct stlibrd *brdp)
{       
        outb(ECP_EIENABLE, (brdp->iobase + ECP_EICONFR));
}

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

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

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

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

        if (offset > brdp->memsize) {
                printk(KERN_ERR "istallion: 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(struct stlibrd *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(struct stlibrd *brdp)
{       
        outb(ECP_MCENABLE, (brdp->iobase + ECP_MCCONFR));
}

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

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

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

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

        if (offset > brdp->memsize) {
                printk(KERN_ERR "istallion: 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(struct stlibrd *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(struct stlibrd *brdp)
{
        outb(ECP_PCISTOP, (brdp->iobase + ECP_PCICONFR));
        udelay(10);
        outb(0, (brdp->iobase + ECP_PCICONFR));
        udelay(500);
}

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

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

        if (offset > brdp->memsize) {
                printk(KERN_ERR "istallion: 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(struct stlibrd *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(struct stlibrd *brdp)
{
        unsigned long   memconf;

        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(struct stlibrd *brdp)
{       
        outb((brdp->enabval | ONB_ATENABLE), (brdp->iobase + ONB_ATCONFR));
}

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

static void stli_onbdisable(struct stlibrd *brdp)
{       
        outb((brdp->enabval | ONB_ATDISABLE), (brdp->iobase + ONB_ATCONFR));
}

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

static void __iomem *stli_onbgetmemptr(struct stlibrd *brdp, unsigned long offset, int line)
{       
        void __iomem *ptr;

        if (offset > brdp->memsize) {
                printk(KERN_ERR "istallion: 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(struct stlibrd *brdp)
{       
        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(struct stlibrd *brdp)
{
        unsigned long   memconf;

        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(struct stlibrd *brdp)
{       
        outb(ONB_EIENABLE, (brdp->iobase + ONB_EICONFR));
}

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

static void stli_onbedisable(struct stlibrd *brdp)
{       
        outb(ONB_EIDISABLE, (brdp->iobase + ONB_EICONFR));
}

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

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

        if (offset > brdp->memsize) {
                printk(KERN_ERR "istallion: 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(struct stlibrd *brdp)
{       
        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(struct stlibrd *brdp)
{
        outb(BBY_ATSTOP, (brdp->iobase + BBY_ATCONFR));
        udelay(10);
        outb(0, (brdp->iobase + BBY_ATCONFR));
        mdelay(1000);
        outb(0x1, brdp->iobase);
        mdelay(1);
}

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

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

        BUG_ON(offset > brdp->memsize);

        ptr = brdp->membase + (offset % BBY_PAGESIZE);
        val = (unsigned char) (offset / BBY_PAGESIZE);
        outb(val, (brdp->iobase + BBY_ATCONFR));
        return(ptr);
}

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

static void stli_bbyreset(struct stlibrd *brdp)
{       
        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(struct stlibrd *brdp)
{
        outb(0x1, brdp->iobase);
        mdelay(1000);
}

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

static void __iomem *stli_stalgetmemptr(struct stlibrd *brdp, unsigned long offset, int line)
{       
        BUG_ON(offset > brdp->memsize);
        return brdp->membase + (offset % STAL_PAGESIZE);
}

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

static void stli_stalreset(struct stlibrd *brdp)
{       
        u32 __iomem *vecp;

        vecp = (u32 __iomem *) (brdp->membase + 0x30);
        writel(0xffff0000, vecp);
        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(struct stlibrd *brdp)
{
        cdkecpsig_t sig;
        cdkecpsig_t __iomem *sigsp;
        unsigned int status, nxtid;
        char *name;
        int retval, panelnr, nrports;

        if ((brdp->iobase == 0) || (brdp->memaddr == 0)) {
                retval = -ENODEV;
                goto err;
        }

        brdp->iosize = ECP_IOSIZE;

        if (!request_region(brdp->iobase, brdp->iosize, "istallion")) {
                retval = -EIO;
                goto err;
        }

/*
 *      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->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->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->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->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:
                retval = -EINVAL;
                goto err_reg;
        }

/*
 *      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_nocache(brdp->memaddr, brdp->memsize);
        if (brdp->membase == NULL) {
                retval = -ENOMEM;
                goto err_reg;
        }

/*
 *      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 __iomem *) EBRDGETMEMPTR(brdp, CDK_SIGADDR);
        memcpy_fromio(&sig, sigsp, sizeof(cdkecpsig_t));
        EBRDDISABLE(brdp);

        if (sig.magic != cpu_to_le32(ECP_MAGIC)) {
                retval = -ENODEV;
                goto err_unmap;
        }

/*
 *      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;
err_unmap:
        iounmap(brdp->membase);
        brdp->membase = NULL;
err_reg:
        release_region(brdp->iobase, brdp->iosize);
err:
        return retval;
}

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

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

static int stli_initonb(struct stlibrd *brdp)
{
        cdkonbsig_t sig;
        cdkonbsig_t __iomem *sigsp;
        char *name;
        int i, retval;

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

        brdp->iosize = ONB_IOSIZE;
        
        if (!request_region(brdp->iobase, brdp->iosize, "istallion")) {
                retval = -EIO;
                goto err;
        }

/*
 *      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_ONBOARD2:
                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->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:
                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->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:
                retval = -EINVAL;
                goto err_reg;
        }

/*
 *      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_nocache(brdp->memaddr, brdp->memsize);
        if (brdp->membase == NULL) {
                retval = -ENOMEM;
                goto err_reg;
        }

/*
 *      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 __iomem *) EBRDGETMEMPTR(brdp, CDK_SIGADDR);
        memcpy_fromio(&sig, sigsp, sizeof(cdkonbsig_t));
        EBRDDISABLE(brdp);

        if (sig.magic0 != cpu_to_le16(ONB_MAGIC0) ||
            sig.magic1 != cpu_to_le16(ONB_MAGIC1) ||
            sig.magic2 != cpu_to_le16(ONB_MAGIC2) ||
            sig.magic3 != cpu_to_le16(ONB_MAGIC3)) {
                retval = -ENODEV;
                goto err_unmap;
        }

/*
 *      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;
err_unmap:
        iounmap(brdp->membase);
        brdp->membase = NULL;
err_reg:
        release_region(brdp->iobase, brdp->iosize);
err:
        return retval;
}

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

/*
 *      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(struct stlibrd *brdp)
{
        cdkhdr_t __iomem *hdrp;
        cdkmem_t __iomem *memp;
        cdkasy_t __iomem *ap;
        unsigned long flags;
        unsigned int portnr, nrdevs, i;
        struct stliport *portp;
        int rc = 0;
        u32 memoff;

        spin_lock_irqsave(&brd_lock, flags);
        EBRDENABLE(brdp);
        hdrp = (cdkhdr_t __iomem *) 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__, readb(&hdrp->ver_release), readb(&hdrp->ver_modification),
                 readb(&hdrp->ver_fix), nrdevs, (int) readl(&hdrp->memp), readl(&hdrp->hostp),
                 readl(&hdrp->slavep));
#endif

        if (nrdevs < (brdp->nrports + 1)) {
                printk(KERN_ERR "istallion: 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;
        memoff = readl(&hdrp->memp);
        if (memoff > brdp->memsize) {
                printk(KERN_ERR "istallion: corrupted shared memory region?\n");
                rc = -EIO;
                goto stli_donestartup;
        }
        memp = (cdkmem_t __iomem *) EBRDGETMEMPTR(brdp, memoff);
        if (readw(&memp->dtype) != TYP_ASYNCTRL) {
                printk(KERN_ERR "istallion: 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 (readw(&memp->dtype) != TYP_ASYNC)
                        break;
                portp = brdp->ports[portnr];
                if (portp == NULL)
                        break;
                portp->devnr = i;
                portp->addr = readl(&memp->offset);
                portp->reqbit = (unsigned char) (0x1 << (i * 8 / nrdevs));
                portp->portidx = (unsigned char) (i / 8);
                portp->portbit = (unsigned char) (0x1 << (i % 8));
        }

        writeb(0xff, &hdrp->slavereq);

/*
 *      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 == NULL)
                        break;
                if (portp->addr == 0)
                        break;
                ap = (cdkasy_t __iomem *) EBRDGETMEMPTR(brdp, portp->addr);
                if (ap != NULL) {
                        portp->rxsize = readw(&ap->rxq.size);
                        portp->txsize = readw(&ap->txq.size);
                        portp->rxoffset = readl(&ap->rxq.offset);
                        portp->txoffset = readl(&ap->txq.offset);
                }
        }

stli_donestartup:
        EBRDDISABLE(brdp);
        spin_unlock_irqrestore(&brd_lock, flags);

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

        if (! stli_timeron) {
                stli_timeron++;
                mod_timer(&stli_timerlist, STLI_TIMEOUT);
        }

        return rc;
}

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

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

static int __devinit stli_brdinit(struct stlibrd *brdp)
{
        int retval;

        switch (brdp->brdtype) {
        case BRD_ECP:
        case BRD_ECPE:
        case BRD_ECPMC:
        case BRD_ECPPCI:
                retval = stli_initecp(brdp);
                break;
        case BRD_ONBOARD:
        case BRD_ONBOARDE:
        case BRD_ONBOARD2:
        case BRD_BRUMBY4:
        case BRD_STALLION:
                retval = stli_initonb(brdp);
                break;
        default:
                printk(KERN_ERR "istallion: board=%d is unknown board "
                                "type=%d\n", brdp->brdnr, brdp->brdtype);
                retval = -ENODEV;
        }

        if (retval)
                return retval;

        stli_initports(brdp);
        printk(KERN_INFO "istallion: %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;
}

#if STLI_EISAPROBE != 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(struct stlibrd *brdp)
{
        cdkecpsig_t     ecpsig, __iomem *ecpsigp;
        cdkonbsig_t     onbsig, __iomem *onbsigp;
        int             i, foundit;

/*
 *      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 = ioremap_nocache(brdp->memaddr, brdp->memsize);
                if (brdp->membase == NULL)
                        continue;

                if (brdp->brdtype == BRD_ECPE) {
                        ecpsigp = stli_ecpeigetmemptr(brdp,
                                CDK_SIGADDR, __LINE__);
                        memcpy_fromio(&ecpsig, ecpsigp, sizeof(cdkecpsig_t));
                        if (ecpsig.magic == cpu_to_le32(ECP_MAGIC))
                                foundit = 1;
                } else {
                        onbsigp = (cdkonbsig_t __iomem *) stli_onbegetmemptr(brdp,
                                CDK_SIGADDR, __LINE__);
                        memcpy_fromio(&onbsig, onbsigp, sizeof(cdkonbsig_t));
                        if ((onbsig.magic0 == cpu_to_le16(ONB_MAGIC0)) &&
                            (onbsig.magic1 == cpu_to_le16(ONB_MAGIC1)) &&
                            (onbsig.magic2 == cpu_to_le16(ONB_MAGIC2)) &&
                            (onbsig.magic3 == cpu_to_le16(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 "istallion: failed to probe shared memory "
                                "region for %s in EISA slot=%d\n",
                        stli_brdnames[brdp->brdtype], (brdp->iobase >> 12));
                return -ENODEV;
        }
        return 0;
}
#endif

static int stli_getbrdnr(void)
{
        unsigned 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;
}

#if STLI_EISAPROBE != 0
/*****************************************************************************/

/*
 *      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 __init stli_findeisabrds(void)
{
        struct stlibrd *brdp;
        unsigned int iobase, eid, i;
        int brdnr, found = 0;

/*
 *      Firstly check if this is an EISA system.  If this is not an EISA system then
 *      don't bother going any further!
 */
        if (EISA_bus)
                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 == 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()) == NULL)
                        return found ? : -ENOMEM;
                brdnr = stli_getbrdnr();
                if (brdnr < 0)
                        return found ? : -ENOMEM;
                brdp->brdnr = (unsigned int)brdnr;
                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));
                if (stli_brdinit(brdp) < 0) {
                        kfree(brdp);
                        continue;
                }

                stli_brds[brdp->brdnr] = brdp;
                found++;

                for (i = 0; i < brdp->nrports; i++)
                        tty_register_device(stli_serial,
                                        brdp->brdnr * STL_MAXPORTS + i, NULL);
        }

        return found;
}
#else
static inline int stli_findeisabrds(void) { return 0; }
#endif

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

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

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

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

static int __devinit stli_pciprobe(struct pci_dev *pdev,
                const struct pci_device_id *ent)
{
        struct stlibrd *brdp;
        unsigned int i;
        int brdnr, retval = -EIO;

        retval = pci_enable_device(pdev);
        if (retval)
                goto err;
        brdp = stli_allocbrd();
        if (brdp == NULL) {
                retval = -ENOMEM;
                goto err;
        }
        mutex_lock(&stli_brdslock);
        brdnr = stli_getbrdnr();
        if (brdnr < 0) {
                printk(KERN_INFO "istallion: too many boards found, "
                        "maximum supported %d\n", STL_MAXBRDS);
                mutex_unlock(&stli_brdslock);
                retval = -EIO;
                goto err_fr;
        }
        brdp->brdnr = (unsigned int)brdnr;
        stli_brds[brdp->brdnr] = brdp;
        mutex_unlock(&stli_brdslock);
        brdp->brdtype = BRD_ECPPCI;
/*
 *      We have all resources from the board, so lets setup the actual
 *      board structure now.
 */
        brdp->iobase = pci_resource_start(pdev, 3);
        brdp->memaddr = pci_resource_start(pdev, 2);
        retval = stli_brdinit(brdp);
        if (retval)
                goto err_null;

        brdp->state |= BST_PROBED;
        pci_set_drvdata(pdev, brdp);

        EBRDENABLE(brdp);
        brdp->enable = NULL;
        brdp->disable = NULL;

        for (i = 0; i < brdp->nrports; i++)
                tty_register_device(stli_serial, brdp->brdnr * STL_MAXPORTS + i,
                                &pdev->dev);

        return 0;
err_null:
        stli_brds[brdp->brdnr] = NULL;
err_fr:
        kfree(brdp);
err:
        return retval;
}

static void __devexit stli_pciremove(struct pci_dev *pdev)
{
        struct stlibrd *brdp = pci_get_drvdata(pdev);

        stli_cleanup_ports(brdp);

        iounmap(brdp->membase);
        if (brdp->iosize > 0)
                release_region(brdp->iobase, brdp->iosize);

        stli_brds[brdp->brdnr] = NULL;
        kfree(brdp);
}

static struct pci_driver stli_pcidriver = {
        .name = "istallion",
        .id_table = istallion_pci_tbl,
        .probe = stli_pciprobe,
        .remove = __devexit_p(stli_pciremove)
};
/*****************************************************************************/

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

static struct stlibrd *stli_allocbrd(void)
{
        struct stlibrd *brdp;

        brdp = kzalloc(sizeof(struct stlibrd), GFP_KERNEL);
        if (!brdp) {
                printk(KERN_ERR "istallion: failed to allocate memory "
                                "(size=%Zd)\n", sizeof(struct stlibrd));
                return NULL;
        }
        brdp->magic = STLI_BOARDMAGIC;
        return brdp;
}

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

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

static int __init stli_initbrds(void)
{
        struct stlibrd *brdp, *nxtbrdp;
        struct stlconf conf;
        unsigned int i, j, found = 0;
        int retval;

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

                for (i = 0; i < brdp->nrports; i++)
                        tty_register_device(stli_serial,
                                        brdp->brdnr * STL_MAXPORTS + i, NULL);
        }

        retval = stli_findeisabrds();
        if (retval > 0)
                found += retval;

/*
 *      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 == NULL)
                                continue;
                        for (j = i + 1; (j < stli_nrbrds); j++) {
                                nxtbrdp = stli_brds[j];
                                if (nxtbrdp == 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 == NULL)
                                continue;
                        if (brdp->state & BST_FOUND) {
                                EBRDENABLE(brdp);
                                brdp->enable = NULL;
                                brdp->disable = NULL;
                        }
                }
        }

        retval = pci_register_driver(&stli_pcidriver);
        if (retval && found == 0) {
                printk(KERN_ERR "Neither isa nor eisa cards found nor pci "
                                "driver can be registered!\n");
                goto err;
        }

        return 0;
err:
        return retval;
}

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

/*
 *      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 __iomem *memptr;
        struct stlibrd *brdp;
        unsigned int brdnr;
        int size, n;
        void *p;
        loff_t off = *offp;

        brdnr = iminor(fp->f_path.dentry->d_inode);
        if (brdnr >= stli_nrbrds)
                return -ENODEV;
        brdp = stli_brds[brdnr];
        if (brdp == NULL)
                return -ENODEV;
        if (brdp->state == 0)
                return -ENODEV;
        if (off >= brdp->memsize || off + count < off)
                return 0;

        size = min(count, (size_t)(brdp->memsize - off));

        /*
         *      Copy the data a page at a time
         */

        p = (void *)__get_free_page(GFP_KERNEL);
        if(p == NULL)
                return -ENOMEM;

        while (size > 0) {
                spin_lock_irqsave(&brd_lock, flags);
                EBRDENABLE(brdp);
                memptr = EBRDGETMEMPTR(brdp, off);
                n = min(size, (int)(brdp->pagesize - (((unsigned long) off) % brdp->pagesize)));
                n = min(n, (int)PAGE_SIZE);
                memcpy_fromio(p, memptr, n);
                EBRDDISABLE(brdp);
                spin_unlock_irqrestore(&brd_lock, flags);
                if (copy_to_user(buf, p, n)) {
                        count = -EFAULT;
                        goto out;
                }
                off += n;
                buf += n;
                size -= n;
        }
out:
        *offp = off;
        free_page((unsigned long)p);
        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 :-)
 *
 *      FIXME: copy under lock
 */

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

        brdnr = iminor(fp->f_path.dentry->d_inode);

        if (brdnr >= stli_nrbrds)
                return -ENODEV;
        brdp = stli_brds[brdnr];
        if (brdp == NULL)
                return -ENODEV;
        if (brdp->state == 0)
                return -ENODEV;
        if (off >= brdp->memsize || off + count < off)
                return 0;

        chbuf = (char __user *) buf;
        size = min(count, (size_t)(brdp->memsize - off));

        /*
         *      Copy the data a page at a time
         */

        p = (void *)__get_free_page(GFP_KERNEL);
        if(p == NULL)
                return -ENOMEM;

        while (size > 0) {
                n = min(size, (int)(brdp->pagesize - (((unsigned long) off) % brdp->pagesize)));
                n = min(n, (int)PAGE_SIZE);
                if (copy_from_user(p, chbuf, n)) {
                        if (count == 0)
                                count = -EFAULT;
                        goto out;
                }
                spin_lock_irqsave(&brd_lock, flags);
                EBRDENABLE(brdp);
                memptr = EBRDGETMEMPTR(brdp, off);
                memcpy_toio(memptr, p, n);
                EBRDDISABLE(brdp);
                spin_unlock_irqrestore(&brd_lock, flags);
                off += n;
                chbuf += n;
                size -= n;
        }
out:
        free_page((unsigned long) p);
        *offp = off;
        return count;
}

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

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

static int stli_getbrdstats(combrd_t __user *bp)
{
        struct stlibrd *brdp;
        unsigned 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 == 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 struct stliport *stli_getport(unsigned int brdnr, unsigned int panelnr,
                unsigned int portnr)
{
        struct stlibrd *brdp;
        unsigned int i;

        if (brdnr >= STL_MAXBRDS)
                return NULL;
        brdp = stli_brds[brdnr];
        if (brdp == NULL)
                return NULL;
        for (i = 0; (i < panelnr); i++)
                portnr += brdp->panels[i];
        if (portnr >= brdp->nrports)
                return 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(struct tty_struct *tty, struct stliport *portp)
{
        unsigned long   flags;
        struct stlibrd  *brdp;
        int             rc;

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

        if (portp == NULL)
                return -ENODEV;
        brdp = stli_brds[portp->brdnr];
        if (brdp == 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->port.flags;

        spin_lock_irqsave(&brd_lock, flags);
        if (tty != NULL) {
                if (portp->port.tty == tty) {
                        stli_comstats.ttystate = tty->flags;
                        stli_comstats.rxbuffered = -1;
                        if (tty->termios != NULL) {
                                stli_comstats.cflags = tty->termios->c_cflag;
                                stli_comstats.iflags = tty->termios->c_iflag;
                                stli_comstats.oflags = tty->termios->c_oflag;
                                stli_comstats.lflags = tty->termios->c_lflag;
                        }
                }
        }
        spin_unlock_irqrestore(&brd_lock, 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(struct tty_struct *tty, struct stliport *portp,
                                                        comstats_t __user *cp)
{
        struct stlibrd *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(tty, 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(struct stliport *portp, comstats_t __user *cp)
{
        struct stlibrd *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(struct stliport __user *arg)
{
        struct stliport stli_dummyport;
        struct stliport *portp;

        if (copy_from_user(&stli_dummyport, arg, sizeof(struct stliport)))
                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(struct stliport)))
                return -EFAULT;
        return 0;
}

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

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

static int stli_getbrdstruct(struct stlibrd __user *arg)
{
        struct stlibrd stli_dummybrd;
        struct stlibrd *brdp;

        if (copy_from_user(&stli_dummybrd, arg, sizeof(struct stlibrd)))
                return -EFAULT;
        if (stli_dummybrd.brdnr >= STL_MAXBRDS)
                return -ENODEV;
        brdp = stli_brds[stli_dummybrd.brdnr];
        if (!brdp)
                return -ENODEV;
        if (copy_to_user(arg, brdp, sizeof(struct stlibrd)))
                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)
{
        struct stlibrd *brdp;
        int brdnr, rc, done;
        void __user *argp = (void __user *)arg;

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

        lock_kernel();

        switch (cmd) {
        case COM_GETPORTSTATS:
                rc = stli_getportstats(NULL, 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;
        }
        unlock_kernel();

        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;

        lock_kernel();

        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;
        }
        unlock_kernel();
        return rc;
}

static const 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,
        .tiocmget = stli_tiocmget,
        .tiocmset = stli_tiocmset,
        .proc_fops = &stli_proc_fops,
};

static const struct tty_port_operations stli_port_ops = {
        .carrier_raised = stli_carrier_raised,
        .dtr_rts = stli_dtr_rts,
};

/*****************************************************************************/
/*
 *      Loadable module initialization stuff.
 */

static void istallion_cleanup_isa(void)
{
        struct stlibrd  *brdp;
        unsigned int j;

        for (j = 0; (j < stli_nrbrds); j++) {
                if ((brdp = stli_brds[j]) == NULL || (brdp->state & BST_PROBED))
                        continue;

                stli_cleanup_ports(brdp);

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

static int __init istallion_module_init(void)
{
        unsigned int i;
        int retval;

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

        spin_lock_init(&stli_lock);
        spin_lock_init(&brd_lock);

        stli_txcookbuf = kmalloc(STLI_TXBUFSIZE, GFP_KERNEL);
        if (!stli_txcookbuf) {
                printk(KERN_ERR "istallion: failed to allocate memory "
                                "(size=%d)\n", STLI_TXBUFSIZE);
                retval = -ENOMEM;
                goto err;
        }

        stli_serial = alloc_tty_driver(STL_MAXBRDS * STL_MAXPORTS);
        if (!stli_serial) {
                retval = -ENOMEM;
                goto err_free;
        }

        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_DRIVER_DYNAMIC_DEV;
        tty_set_operations(stli_serial, &stli_ops);

        retval = tty_register_driver(stli_serial);
        if (retval) {
                printk(KERN_ERR "istallion: failed to register serial driver\n");
                goto err_ttyput;
        }

        retval = stli_initbrds();
        if (retval)
                goto err_ttyunr;

/*
 *      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.
 */
        retval = register_chrdev(STL_SIOMEMMAJOR, "staliomem", &stli_fsiomem);
        if (retval) {
                printk(KERN_ERR "istallion: failed to register serial memory "
                                "device\n");
                goto err_deinit;
        }

        istallion_class = class_create(THIS_MODULE, "staliomem");
        for (i = 0; i < 4; i++)
                device_create(istallion_class, NULL, MKDEV(STL_SIOMEMMAJOR, i),
                              NULL, "staliomem%d", i);

        return 0;
err_deinit:
        pci_unregister_driver(&stli_pcidriver);
        istallion_cleanup_isa();
err_ttyunr:
        tty_unregister_driver(stli_serial);
err_ttyput:
        put_tty_driver(stli_serial);
err_free:
        kfree(stli_txcookbuf);
err:
        return retval;
}

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

static void __exit istallion_module_exit(void)
{
        unsigned int j;

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

        if (stli_timeron) {
                stli_timeron = 0;
                del_timer_sync(&stli_timerlist);
        }

        unregister_chrdev(STL_SIOMEMMAJOR, "staliomem");

        for (j = 0; j < 4; j++)
                device_destroy(istallion_class, MKDEV(STL_SIOMEMMAJOR, j));
        class_destroy(istallion_class);

        pci_unregister_driver(&stli_pcidriver);
        istallion_cleanup_isa();

        tty_unregister_driver(stli_serial);
        put_tty_driver(stli_serial);

        kfree(stli_txcookbuf);
}

module_init(istallion_module_init);
module_exit(istallion_module_exit);