URL https://opencores.org/ocsvn/test_project/test_project/trunk
Subversion Repositories test_project

[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [char/] [stallion.c] - Blame information for rev 65

Go to most recent revision | Details | Compare with Previous | View Log

/*****************************************************************************/
 
/*
 *      stallion.c  -- stallion multiport serial driver.
 *
 *      Copyright (C) 1996-1999  Stallion Technologies
 *      Copyright (C) 1994-1996  Greg Ungerer.
 *
 *      This code is loosely based on the Linux serial driver, written by
 *      Linus Torvalds, Theodore T'so and others.
 *
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *
 *      This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *
 *      You should have received a copy of the GNU General Public License
 *      along with this program; if not, write to the Free Software
 *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
/*****************************************************************************/
 
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/cd1400.h>
#include <linux/sc26198.h>
#include <linux/comstats.h>
#include <linux/stallion.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/smp_lock.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/ctype.h>
 
#include <asm/io.h>
#include <asm/uaccess.h>
 
#include <linux/pci.h>
 
/*****************************************************************************/
 
/*
 *      Define different board types. Use the standard Stallion "assigned"
 *      board numbers. Boards supported in this driver are abbreviated as
 *      EIO = EasyIO and ECH = EasyConnection 8/32.
 */
#define BRD_EASYIO      20
#define BRD_ECH         21
#define BRD_ECHMC       22
#define BRD_ECHPCI      26
#define BRD_ECH64PCI    27
#define BRD_EASYIOPCI   28
 
struct stlconf {
        unsigned int    brdtype;
        int             ioaddr1;
        int             ioaddr2;
        unsigned long   memaddr;
        int             irq;
        int             irqtype;
};
 
static unsigned int stl_nrbrds;
 
/*****************************************************************************/
 
/*
 *      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
 
/*
 *      Set the TX buffer size. Bigger is better, but we don't want
 *      to chew too much memory with buffers!
 */
#define STL_TXBUFLOW            512
#define STL_TXBUFSIZE           4096
 
/*****************************************************************************/
 
/*
 *      Define our local driver identity first. Set up stuff to deal with
 *      all the local structures required by a serial tty driver.
 */
static char     *stl_drvtitle = "Stallion Multiport Serial Driver";
static char     *stl_drvname = "stallion";
static char     *stl_drvversion = "5.6.0";
 
static struct tty_driver        *stl_serial;
 
/*
 *      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, 8 data bits, 1 stop bit.
 */
static struct ktermios          stl_deftermios = {
        .c_cflag        = (B9600 | CS8 | CREAD | HUPCL | CLOCAL),
        .c_cc           = INIT_C_CC,
        .c_ispeed       = 9600,
        .c_ospeed       = 9600,
};
 
/*
 *      Define global place to put buffer overflow characters.
 */
static char             stl_unwanted[SC26198_RXFIFOSIZE];
 
/*****************************************************************************/
 
static DEFINE_MUTEX(stl_brdslock);
static struct stlbrd            *stl_brds[STL_MAXBRDS];
 
/*
 *      Per board state flags. Used with the state field of the board struct.
 *      Not really much here!
 */
#define BRD_FOUND       0x1
#define STL_PROBED      0x2
 
 
/*
 *      Define the port structure istate flags. These set of flags are
 *      modified at interrupt time - so setting and reseting them needs
 *      to be atomic. Use the bit clear/setting routines for this.
 */
#define ASYI_TXBUSY     1
#define ASYI_TXLOW      2
#define ASYI_DCDCHANGE  3
#define ASYI_TXFLOWED   4
 
/*
 *      Define an array of board names as printable strings. Handy for
 *      referencing boards when printing trace and stuff.
 */
static char     *stl_brdnames[] = {
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        "EasyIO",
        "EC8/32-AT",
        "EC8/32-MC",
        NULL,
        NULL,
        NULL,
        "EC8/32-PCI",
        "EC8/64-PCI",
        "EasyIO-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 unsigned int stl_nargs;
static char     *board0[4];
static char     *board1[4];
static char     *board2[4];
static char     *board3[4];
 
static char     **stl_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 {
        char    *name;
        int     type;
} stl_brdstr[] = {
        { "easyio", BRD_EASYIO },
        { "eio", BRD_EASYIO },
        { "20", BRD_EASYIO },
        { "ec8/32", BRD_ECH },
        { "ec8/32-at", BRD_ECH },
        { "ec8/32-isa", BRD_ECH },
        { "ech", BRD_ECH },
        { "echat", BRD_ECH },
        { "21", BRD_ECH },
        { "ec8/32-mc", BRD_ECHMC },
        { "ec8/32-mca", BRD_ECHMC },
        { "echmc", BRD_ECHMC },
        { "echmca", BRD_ECHMC },
        { "22", BRD_ECHMC },
        { "ec8/32-pc", BRD_ECHPCI },
        { "ec8/32-pci", BRD_ECHPCI },
        { "26", BRD_ECHPCI },
        { "ec8/64-pc", BRD_ECH64PCI },
        { "ec8/64-pci", BRD_ECH64PCI },
        { "ech-pci", BRD_ECH64PCI },
        { "echpci", BRD_ECH64PCI },
        { "echpc", BRD_ECH64PCI },
        { "27", BRD_ECH64PCI },
        { "easyio-pc", BRD_EASYIOPCI },
        { "easyio-pci", BRD_EASYIOPCI },
        { "eio-pci", BRD_EASYIOPCI },
        { "eiopci", BRD_EASYIOPCI },
        { "28", BRD_EASYIOPCI },
};
 
/*
 *      Define the module agruments.
 */
 
module_param_array(board0, charp, &stl_nargs, 0);
MODULE_PARM_DESC(board0, "Board 0 config -> name[,ioaddr[,ioaddr2][,irq]]");
module_param_array(board1, charp, &stl_nargs, 0);
MODULE_PARM_DESC(board1, "Board 1 config -> name[,ioaddr[,ioaddr2][,irq]]");
module_param_array(board2, charp, &stl_nargs, 0);
MODULE_PARM_DESC(board2, "Board 2 config -> name[,ioaddr[,ioaddr2][,irq]]");
module_param_array(board3, charp, &stl_nargs, 0);
MODULE_PARM_DESC(board3, "Board 3 config -> name[,ioaddr[,ioaddr2][,irq]]");
 
/*****************************************************************************/
 
/*
 *      Hardware ID bits for the EasyIO and ECH boards. These defines apply
 *      to the directly accessible io ports of these boards (not the uarts -
 *      they are in cd1400.h and sc26198.h).
 */
#define EIO_8PORTRS     0x04
#define EIO_4PORTRS     0x05
#define EIO_8PORTDI     0x00
#define EIO_8PORTM      0x06
#define EIO_MK3         0x03
#define EIO_IDBITMASK   0x07
 
#define EIO_BRDMASK     0xf0
#define ID_BRD4         0x10
#define ID_BRD8         0x20
#define ID_BRD16        0x30
 
#define EIO_INTRPEND    0x08
#define EIO_INTEDGE     0x00
#define EIO_INTLEVEL    0x08
#define EIO_0WS         0x10
 
#define ECH_ID          0xa0
#define ECH_IDBITMASK   0xe0
#define ECH_BRDENABLE   0x08
#define ECH_BRDDISABLE  0x00
#define ECH_INTENABLE   0x01
#define ECH_INTDISABLE  0x00
#define ECH_INTLEVEL    0x02
#define ECH_INTEDGE     0x00
#define ECH_INTRPEND    0x01
#define ECH_BRDRESET    0x01
 
#define ECHMC_INTENABLE 0x01
#define ECHMC_BRDRESET  0x02
 
#define ECH_PNLSTATUS   2
#define ECH_PNL16PORT   0x20
#define ECH_PNLIDMASK   0x07
#define ECH_PNLXPID     0x40
#define ECH_PNLINTRPEND 0x80
 
#define ECH_ADDR2MASK   0x1e0
 
/*
 *      Define the vector mapping bits for the programmable interrupt board
 *      hardware. These bits encode the interrupt for the board to use - it
 *      is software selectable (except the EIO-8M).
 */
static unsigned char    stl_vecmap[] = {
        0xff, 0xff, 0xff, 0x04, 0x06, 0x05, 0xff, 0x07,
        0xff, 0xff, 0x00, 0x02, 0x01, 0xff, 0xff, 0x03
};
 
/*
 *      Lock ordering is that you may not take stallion_lock holding
 *      brd_lock.
 */
 
static spinlock_t brd_lock;             /* Guard the board mapping */
static spinlock_t stallion_lock;        /* Guard the tty driver */
 
/*
 *      Set up enable and disable macros for the ECH boards. They require
 *      the secondary io address space to be activated and deactivated.
 *      This way all ECH boards can share their secondary io region.
 *      If this is an ECH-PCI board then also need to set the page pointer
 *      to point to the correct page.
 */
#define BRDENABLE(brdnr,pagenr)                                         \
        if (stl_brds[(brdnr)]->brdtype == BRD_ECH)                      \
                outb((stl_brds[(brdnr)]->ioctrlval | ECH_BRDENABLE),    \
                        stl_brds[(brdnr)]->ioctrl);                     \
        else if (stl_brds[(brdnr)]->brdtype == BRD_ECHPCI)              \
                outb((pagenr), stl_brds[(brdnr)]->ioctrl);
 
#define BRDDISABLE(brdnr)                                               \
        if (stl_brds[(brdnr)]->brdtype == BRD_ECH)                      \
                outb((stl_brds[(brdnr)]->ioctrlval | ECH_BRDDISABLE),   \
                        stl_brds[(brdnr)]->ioctrl);
 
#define STL_CD1400MAXBAUD       230400
#define STL_SC26198MAXBAUD      460800
 
#define STL_BAUDBASE            115200
#define STL_CLOSEDELAY          (5 * HZ / 10)
 
/*****************************************************************************/
 
/*
 *      Define the Stallion PCI vendor and device IDs.
 */
#ifndef PCI_VENDOR_ID_STALLION
#define PCI_VENDOR_ID_STALLION          0x124d
#endif
#ifndef PCI_DEVICE_ID_ECHPCI832
#define PCI_DEVICE_ID_ECHPCI832         0x0000
#endif
#ifndef PCI_DEVICE_ID_ECHPCI864
#define PCI_DEVICE_ID_ECHPCI864         0x0002
#endif
#ifndef PCI_DEVICE_ID_EIOPCI
#define PCI_DEVICE_ID_EIOPCI            0x0003
#endif
 
/*
 *      Define structure to hold all Stallion PCI boards.
 */
 
static struct pci_device_id stl_pcibrds[] = {
        { PCI_DEVICE(PCI_VENDOR_ID_STALLION, PCI_DEVICE_ID_ECHPCI864),
                .driver_data = BRD_ECH64PCI },
        { PCI_DEVICE(PCI_VENDOR_ID_STALLION, PCI_DEVICE_ID_EIOPCI),
                .driver_data = BRD_EASYIOPCI },
        { PCI_DEVICE(PCI_VENDOR_ID_STALLION, PCI_DEVICE_ID_ECHPCI832),
                .driver_data = BRD_ECHPCI },
        { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87410),
                .driver_data = BRD_ECHPCI },
        { }
};
MODULE_DEVICE_TABLE(pci, stl_pcibrds);
 
/*****************************************************************************/
 
/*
 *      Define macros to extract a brd/port number from a minor number.
 */
#define MINOR2BRD(min)          (((min) & 0xc0) >> 6)
#define MINOR2PORT(min)         ((min) & 0x3f)
 
/*
 *      Define a baud rate table that converts termios baud rate selector
 *      into the actual baud rate value. All baud rate calculations are
 *      based on the actual baud rate required.
 */
static unsigned int     stl_baudrates[] = {
        0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
        9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600
};
 
/*****************************************************************************/
 
/*
 *      Declare all those functions in this driver!
 */
 
static int      stl_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, unsigned long arg);
static int      stl_brdinit(struct stlbrd *brdp);
static int      stl_getportstats(struct stlport *portp, comstats_t __user *cp);
static int      stl_clrportstats(struct stlport *portp, comstats_t __user *cp);
static int      stl_waitcarrier(struct stlport *portp, struct file *filp);
 
/*
 *      CD1400 uart specific handling functions.
 */
static void     stl_cd1400setreg(struct stlport *portp, int regnr, int value);
static int      stl_cd1400getreg(struct stlport *portp, int regnr);
static int      stl_cd1400updatereg(struct stlport *portp, int regnr, int value);
static int      stl_cd1400panelinit(struct stlbrd *brdp, struct stlpanel *panelp);
static void     stl_cd1400portinit(struct stlbrd *brdp, struct stlpanel *panelp, struct stlport *portp);
static void     stl_cd1400setport(struct stlport *portp, struct ktermios *tiosp);
static int      stl_cd1400getsignals(struct stlport *portp);
static void     stl_cd1400setsignals(struct stlport *portp, int dtr, int rts);
static void     stl_cd1400ccrwait(struct stlport *portp);
static void     stl_cd1400enablerxtx(struct stlport *portp, int rx, int tx);
static void     stl_cd1400startrxtx(struct stlport *portp, int rx, int tx);
static void     stl_cd1400disableintrs(struct stlport *portp);
static void     stl_cd1400sendbreak(struct stlport *portp, int len);
static void     stl_cd1400flowctrl(struct stlport *portp, int state);
static void     stl_cd1400sendflow(struct stlport *portp, int state);
static void     stl_cd1400flush(struct stlport *portp);
static int      stl_cd1400datastate(struct stlport *portp);
static void     stl_cd1400eiointr(struct stlpanel *panelp, unsigned int iobase);
static void     stl_cd1400echintr(struct stlpanel *panelp, unsigned int iobase);
static void     stl_cd1400txisr(struct stlpanel *panelp, int ioaddr);
static void     stl_cd1400rxisr(struct stlpanel *panelp, int ioaddr);
static void     stl_cd1400mdmisr(struct stlpanel *panelp, int ioaddr);
 
static inline int       stl_cd1400breakisr(struct stlport *portp, int ioaddr);
 
/*
 *      SC26198 uart specific handling functions.
 */
static void     stl_sc26198setreg(struct stlport *portp, int regnr, int value);
static int      stl_sc26198getreg(struct stlport *portp, int regnr);
static int      stl_sc26198updatereg(struct stlport *portp, int regnr, int value);
static int      stl_sc26198getglobreg(struct stlport *portp, int regnr);
static int      stl_sc26198panelinit(struct stlbrd *brdp, struct stlpanel *panelp);
static void     stl_sc26198portinit(struct stlbrd *brdp, struct stlpanel *panelp, struct stlport *portp);
static void     stl_sc26198setport(struct stlport *portp, struct ktermios *tiosp);
static int      stl_sc26198getsignals(struct stlport *portp);
static void     stl_sc26198setsignals(struct stlport *portp, int dtr, int rts);
static void     stl_sc26198enablerxtx(struct stlport *portp, int rx, int tx);
static void     stl_sc26198startrxtx(struct stlport *portp, int rx, int tx);
static void     stl_sc26198disableintrs(struct stlport *portp);
static void     stl_sc26198sendbreak(struct stlport *portp, int len);
static void     stl_sc26198flowctrl(struct stlport *portp, int state);
static void     stl_sc26198sendflow(struct stlport *portp, int state);
static void     stl_sc26198flush(struct stlport *portp);
static int      stl_sc26198datastate(struct stlport *portp);
static void     stl_sc26198wait(struct stlport *portp);
static void     stl_sc26198txunflow(struct stlport *portp, struct tty_struct *tty);
static void     stl_sc26198intr(struct stlpanel *panelp, unsigned int iobase);
static void     stl_sc26198txisr(struct stlport *port);
static void     stl_sc26198rxisr(struct stlport *port, unsigned int iack);
static void     stl_sc26198rxbadch(struct stlport *portp, unsigned char status, char ch);
static void     stl_sc26198rxbadchars(struct stlport *portp);
static void     stl_sc26198otherisr(struct stlport *port, unsigned int iack);
 
/*****************************************************************************/
 
/*
 *      Generic UART support structure.
 */
typedef struct uart {
        int     (*panelinit)(struct stlbrd *brdp, struct stlpanel *panelp);
        void    (*portinit)(struct stlbrd *brdp, struct stlpanel *panelp, struct stlport *portp);
        void    (*setport)(struct stlport *portp, struct ktermios *tiosp);
        int     (*getsignals)(struct stlport *portp);
        void    (*setsignals)(struct stlport *portp, int dtr, int rts);
        void    (*enablerxtx)(struct stlport *portp, int rx, int tx);
        void    (*startrxtx)(struct stlport *portp, int rx, int tx);
        void    (*disableintrs)(struct stlport *portp);
        void    (*sendbreak)(struct stlport *portp, int len);
        void    (*flowctrl)(struct stlport *portp, int state);
        void    (*sendflow)(struct stlport *portp, int state);
        void    (*flush)(struct stlport *portp);
        int     (*datastate)(struct stlport *portp);
        void    (*intr)(struct stlpanel *panelp, unsigned int iobase);
} uart_t;
 
/*
 *      Define some macros to make calling these functions nice and clean.
 */
#define stl_panelinit           (* ((uart_t *) panelp->uartp)->panelinit)
#define stl_portinit            (* ((uart_t *) portp->uartp)->portinit)
#define stl_setport             (* ((uart_t *) portp->uartp)->setport)
#define stl_getsignals          (* ((uart_t *) portp->uartp)->getsignals)
#define stl_setsignals          (* ((uart_t *) portp->uartp)->setsignals)
#define stl_enablerxtx          (* ((uart_t *) portp->uartp)->enablerxtx)
#define stl_startrxtx           (* ((uart_t *) portp->uartp)->startrxtx)
#define stl_disableintrs        (* ((uart_t *) portp->uartp)->disableintrs)
#define stl_sendbreak           (* ((uart_t *) portp->uartp)->sendbreak)
#define stl_flowctrl            (* ((uart_t *) portp->uartp)->flowctrl)
#define stl_sendflow            (* ((uart_t *) portp->uartp)->sendflow)
#define stl_flush               (* ((uart_t *) portp->uartp)->flush)
#define stl_datastate           (* ((uart_t *) portp->uartp)->datastate)
 
/*****************************************************************************/
 
/*
 *      CD1400 UART specific data initialization.
 */
static uart_t stl_cd1400uart = {
        stl_cd1400panelinit,
        stl_cd1400portinit,
        stl_cd1400setport,
        stl_cd1400getsignals,
        stl_cd1400setsignals,
        stl_cd1400enablerxtx,
        stl_cd1400startrxtx,
        stl_cd1400disableintrs,
        stl_cd1400sendbreak,
        stl_cd1400flowctrl,
        stl_cd1400sendflow,
        stl_cd1400flush,
        stl_cd1400datastate,
        stl_cd1400eiointr
};
 
/*
 *      Define the offsets within the register bank of a cd1400 based panel.
 *      These io address offsets are common to the EasyIO board as well.
 */
#define EREG_ADDR       0
#define EREG_DATA       4
#define EREG_RXACK      5
#define EREG_TXACK      6
#define EREG_MDACK      7
 
#define EREG_BANKSIZE   8
 
#define CD1400_CLK      25000000
#define CD1400_CLK8M    20000000
 
/*
 *      Define the cd1400 baud rate clocks. These are used when calculating
 *      what clock and divisor to use for the required baud rate. Also
 *      define the maximum baud rate allowed, and the default base baud.
 */
static int      stl_cd1400clkdivs[] = {
        CD1400_CLK0, CD1400_CLK1, CD1400_CLK2, CD1400_CLK3, CD1400_CLK4
};
 
/*****************************************************************************/
 
/*
 *      SC26198 UART specific data initization.
 */
static uart_t stl_sc26198uart = {
        stl_sc26198panelinit,
        stl_sc26198portinit,
        stl_sc26198setport,
        stl_sc26198getsignals,
        stl_sc26198setsignals,
        stl_sc26198enablerxtx,
        stl_sc26198startrxtx,
        stl_sc26198disableintrs,
        stl_sc26198sendbreak,
        stl_sc26198flowctrl,
        stl_sc26198sendflow,
        stl_sc26198flush,
        stl_sc26198datastate,
        stl_sc26198intr
};
 
/*
 *      Define the offsets within the register bank of a sc26198 based panel.
 */
#define XP_DATA         0
#define XP_ADDR         1
#define XP_MODID        2
#define XP_STATUS       2
#define XP_IACK         3
 
#define XP_BANKSIZE     4
 
/*
 *      Define the sc26198 baud rate table. Offsets within the table
 *      represent the actual baud rate selector of sc26198 registers.
 */
static unsigned int     sc26198_baudtable[] = {
        50, 75, 150, 200, 300, 450, 600, 900, 1200, 1800, 2400, 3600,
        4800, 7200, 9600, 14400, 19200, 28800, 38400, 57600, 115200,
        230400, 460800, 921600
};
 
#define SC26198_NRBAUDS         ARRAY_SIZE(sc26198_baudtable)
 
/*****************************************************************************/
 
/*
 *      Define the driver info for a user level control device. Used mainly
 *      to get at port stats - only not using the port device itself.
 */
static const struct file_operations     stl_fsiomem = {
        .owner          = THIS_MODULE,
        .ioctl          = stl_memioctl,
};
 
static struct class *stallion_class;
 
/*
 *      Check for any arguments passed in on the module load command line.
 */
 
/*****************************************************************************/
 
/*
 *      Parse the supplied argument string, into the board conf struct.
 */
 
static int __init stl_parsebrd(struct stlconf *confp, char **argp)
{
        char    *sp;
        unsigned int i;
 
        pr_debug("stl_parsebrd(confp=%p,argp=%p)\n", confp, argp);
 
        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(stl_brdstr); i++)
                if (strcmp(stl_brdstr[i].name, argp[0]) == 0)
                        break;
 
        if (i == ARRAY_SIZE(stl_brdstr)) {
                printk("STALLION: unknown board name, %s?\n", argp[0]);
                return 0;
        }
 
        confp->brdtype = stl_brdstr[i].type;
 
        i = 1;
        if ((argp[i] != NULL) && (*argp[i] != 0))
                confp->ioaddr1 = simple_strtoul(argp[i], NULL, 0);
        i++;
        if (confp->brdtype == BRD_ECH) {
                if ((argp[i] != NULL) && (*argp[i] != 0))
                        confp->ioaddr2 = simple_strtoul(argp[i], NULL, 0);
                i++;
        }
        if ((argp[i] != NULL) && (*argp[i] != 0))
                confp->irq = simple_strtoul(argp[i], NULL, 0);
        return 1;
}
 
/*****************************************************************************/
 
/*
 *      Allocate a new board structure. Fill out the basic info in it.
 */
 
static struct stlbrd *stl_allocbrd(void)
{
        struct stlbrd   *brdp;
 
        brdp = kzalloc(sizeof(struct stlbrd), GFP_KERNEL);
        if (!brdp) {
                printk("STALLION: failed to allocate memory (size=%Zd)\n",
                        sizeof(struct stlbrd));
                return NULL;
        }
 
        brdp->magic = STL_BOARDMAGIC;
        return brdp;
}
 
/*****************************************************************************/
 
static int stl_open(struct tty_struct *tty, struct file *filp)
{
        struct stlport  *portp;
        struct stlbrd   *brdp;
        unsigned int    minordev, brdnr, panelnr;
        int             portnr, rc;
 
        pr_debug("stl_open(tty=%p,filp=%p): device=%s\n", tty, filp, tty->name);
 
        minordev = tty->index;
        brdnr = MINOR2BRD(minordev);
        if (brdnr >= stl_nrbrds)
                return -ENODEV;
        brdp = stl_brds[brdnr];
        if (brdp == NULL)
                return -ENODEV;
        minordev = MINOR2PORT(minordev);
        for (portnr = -1, panelnr = 0; panelnr < STL_MAXPANELS; panelnr++) {
                if (brdp->panels[panelnr] == NULL)
                        break;
                if (minordev < brdp->panels[panelnr]->nrports) {
                        portnr = minordev;
                        break;
                }
                minordev -= brdp->panels[panelnr]->nrports;
        }
        if (portnr < 0)
                return -ENODEV;
 
        portp = brdp->panels[panelnr]->ports[portnr];
        if (portp == NULL)
                return -ENODEV;
 
/*
 *      On the first open of the device setup the port hardware, and
 *      initialize the per port data structure.
 */
        portp->tty = tty;
        tty->driver_data = portp;
        portp->refcount++;
 
        if ((portp->flags & ASYNC_INITIALIZED) == 0) {
                if (!portp->tx.buf) {
                        portp->tx.buf = kmalloc(STL_TXBUFSIZE, GFP_KERNEL);
                        if (!portp->tx.buf)
                                return -ENOMEM;
                        portp->tx.head = portp->tx.buf;
                        portp->tx.tail = portp->tx.buf;
                }
                stl_setport(portp, tty->termios);
                portp->sigs = stl_getsignals(portp);
                stl_setsignals(portp, 1, 1);
                stl_enablerxtx(portp, 1, 1);
                stl_startrxtx(portp, 1, 0);
                clear_bit(TTY_IO_ERROR, &tty->flags);
                portp->flags |= ASYNC_INITIALIZED;
        }
 
/*
 *      Check if this port is in the middle of closing. If so then wait
 *      until it is closed then return error status, based on flag settings.
 *      The sleep here does not need interrupt protection since the wakeup
 *      for it is done with the same context.
 */
        if (portp->flags & ASYNC_CLOSING) {
                interruptible_sleep_on(&portp->close_wait);
                if (portp->flags & ASYNC_HUP_NOTIFY)
                        return -EAGAIN;
                return -ERESTARTSYS;
        }
 
/*
 *      Based on type of open being done check if it can overlap with any
 *      previous opens still in effect. If we are a normal serial device
 *      then also we might have to wait for carrier.
 */
        if (!(filp->f_flags & O_NONBLOCK))
                if ((rc = stl_waitcarrier(portp, filp)) != 0)
                        return rc;
 
        portp->flags |= ASYNC_NORMAL_ACTIVE;
 
        return 0;
}
 
/*****************************************************************************/
 
/*
 *      Possibly need to wait for carrier (DCD signal) to come high. Say
 *      maybe because if we are clocal then we don't need to wait...
 */
 
static int stl_waitcarrier(struct stlport *portp, struct file *filp)
{
        unsigned long   flags;
        int             rc, doclocal;
 
        pr_debug("stl_waitcarrier(portp=%p,filp=%p)\n", portp, filp);
 
        rc = 0;
        doclocal = 0;
 
        spin_lock_irqsave(&stallion_lock, flags);
 
        if (portp->tty->termios->c_cflag & CLOCAL)
                doclocal++;
 
        portp->openwaitcnt++;
        if (! tty_hung_up_p(filp))
                portp->refcount--;
 
        for (;;) {
                /* Takes brd_lock internally */
                stl_setsignals(portp, 1, 1);
                if (tty_hung_up_p(filp) ||
                    ((portp->flags & ASYNC_INITIALIZED) == 0)) {
                        if (portp->flags & ASYNC_HUP_NOTIFY)
                                rc = -EBUSY;
                        else
                                rc = -ERESTARTSYS;
                        break;
                }
                if (((portp->flags & ASYNC_CLOSING) == 0) &&
                    (doclocal || (portp->sigs & TIOCM_CD)))
                        break;
                if (signal_pending(current)) {
                        rc = -ERESTARTSYS;
                        break;
                }
                /* FIXME */
                interruptible_sleep_on(&portp->open_wait);
        }
 
        if (! tty_hung_up_p(filp))
                portp->refcount++;
        portp->openwaitcnt--;
        spin_unlock_irqrestore(&stallion_lock, flags);
 
        return rc;
}
 
/*****************************************************************************/
 
static void stl_flushbuffer(struct tty_struct *tty)
{
        struct stlport  *portp;
 
        pr_debug("stl_flushbuffer(tty=%p)\n", tty);
 
        if (tty == NULL)
                return;
        portp = tty->driver_data;
        if (portp == NULL)
                return;
 
        stl_flush(portp);
        tty_wakeup(tty);
}
 
/*****************************************************************************/
 
static void stl_waituntilsent(struct tty_struct *tty, int timeout)
{
        struct stlport  *portp;
        unsigned long   tend;
 
        pr_debug("stl_waituntilsent(tty=%p,timeout=%d)\n", tty, timeout);
 
        if (tty == NULL)
                return;
        portp = tty->driver_data;
        if (portp == NULL)
                return;
 
        if (timeout == 0)
                timeout = HZ;
        tend = jiffies + timeout;
 
        while (stl_datastate(portp)) {
                if (signal_pending(current))
                        break;
                msleep_interruptible(20);
                if (time_after_eq(jiffies, tend))
                        break;
        }
}
 
/*****************************************************************************/
 
static void stl_close(struct tty_struct *tty, struct file *filp)
{
        struct stlport  *portp;
        unsigned long   flags;
 
        pr_debug("stl_close(tty=%p,filp=%p)\n", tty, filp);
 
        portp = tty->driver_data;
        if (portp == NULL)
                return;
 
        spin_lock_irqsave(&stallion_lock, flags);
        if (tty_hung_up_p(filp)) {
                spin_unlock_irqrestore(&stallion_lock, flags);
                return;
        }
        if ((tty->count == 1) && (portp->refcount != 1))
                portp->refcount = 1;
        if (portp->refcount-- > 1) {
                spin_unlock_irqrestore(&stallion_lock, flags);
                return;
        }
 
        portp->refcount = 0;
        portp->flags |= ASYNC_CLOSING;
 
/*
 *      May want to wait for any data to drain before closing. The BUSY
 *      flag keeps track of whether we are still sending or not - it is
 *      very accurate for the cd1400, not quite so for the sc26198.
 *      (The sc26198 has no "end-of-data" interrupt only empty FIFO)
 */
        tty->closing = 1;
 
        spin_unlock_irqrestore(&stallion_lock, flags);
 
        if (portp->closing_wait != ASYNC_CLOSING_WAIT_NONE)
                tty_wait_until_sent(tty, portp->closing_wait);
        stl_waituntilsent(tty, (HZ / 2));
 
 
        spin_lock_irqsave(&stallion_lock, flags);
        portp->flags &= ~ASYNC_INITIALIZED;
        spin_unlock_irqrestore(&stallion_lock, flags);
 
        stl_disableintrs(portp);
        if (tty->termios->c_cflag & HUPCL)
                stl_setsignals(portp, 0, 0);
        stl_enablerxtx(portp, 0, 0);
        stl_flushbuffer(tty);
        portp->istate = 0;
        if (portp->tx.buf != NULL) {
                kfree(portp->tx.buf);
                portp->tx.buf = NULL;
                portp->tx.head = NULL;
                portp->tx.tail = NULL;
        }
        set_bit(TTY_IO_ERROR, &tty->flags);
        tty_ldisc_flush(tty);
 
        tty->closing = 0;
        portp->tty = NULL;
 
        if (portp->openwaitcnt) {
                if (portp->close_delay)
                        msleep_interruptible(jiffies_to_msecs(portp->close_delay));
                wake_up_interruptible(&portp->open_wait);
        }
 
        portp->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
        wake_up_interruptible(&portp->close_wait);
}
 
/*****************************************************************************/
 
/*
 *      Write routine. Take data and stuff it in to the TX ring queue.
 *      If transmit interrupts are not running then start them.
 */
 
static int stl_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
        struct stlport  *portp;
        unsigned int    len, stlen;
        unsigned char   *chbuf;
        char            *head, *tail;
 
        pr_debug("stl_write(tty=%p,buf=%p,count=%d)\n", tty, buf, count);
 
        portp = tty->driver_data;
        if (portp == NULL)
                return 0;
        if (portp->tx.buf == NULL)
                return 0;
 
/*
 *      If copying direct from user space we must cater for page faults,
 *      causing us to "sleep" here for a while. To handle this copy in all
 *      the data we need now, into a local buffer. Then when we got it all
 *      copy it into the TX buffer.
 */
        chbuf = (unsigned char *) buf;
 
        head = portp->tx.head;
        tail = portp->tx.tail;
        if (head >= tail) {
                len = STL_TXBUFSIZE - (head - tail) - 1;
                stlen = STL_TXBUFSIZE - (head - portp->tx.buf);
        } else {
                len = tail - head - 1;
                stlen = len;
        }
 
        len = min(len, (unsigned int)count);
        count = 0;
        while (len > 0) {
                stlen = min(len, stlen);
                memcpy(head, chbuf, stlen);
                len -= stlen;
                chbuf += stlen;
                count += stlen;
                head += stlen;
                if (head >= (portp->tx.buf + STL_TXBUFSIZE)) {
                        head = portp->tx.buf;
                        stlen = tail - head;
                }
        }
        portp->tx.head = head;
 
        clear_bit(ASYI_TXLOW, &portp->istate);
        stl_startrxtx(portp, -1, 1);
 
        return count;
}
 
/*****************************************************************************/
 
static void stl_putchar(struct tty_struct *tty, unsigned char ch)
{
        struct stlport  *portp;
        unsigned int    len;
        char            *head, *tail;
 
        pr_debug("stl_putchar(tty=%p,ch=%x)\n", tty, ch);
 
        if (tty == NULL)
                return;
        portp = tty->driver_data;
        if (portp == NULL)
                return;
        if (portp->tx.buf == NULL)
                return;
 
        head = portp->tx.head;
        tail = portp->tx.tail;
 
        len = (head >= tail) ? (STL_TXBUFSIZE - (head - tail)) : (tail - head);
        len--;
 
        if (len > 0) {
                *head++ = ch;
                if (head >= (portp->tx.buf + STL_TXBUFSIZE))
                        head = portp->tx.buf;
        }
        portp->tx.head = head;
}
 
/*****************************************************************************/
 
/*
 *      If there are any characters in the buffer then make sure that TX
 *      interrupts are on and get'em out. Normally used after the putchar
 *      routine has been called.
 */
 
static void stl_flushchars(struct tty_struct *tty)
{
        struct stlport  *portp;
 
        pr_debug("stl_flushchars(tty=%p)\n", tty);
 
        if (tty == NULL)
                return;
        portp = tty->driver_data;
        if (portp == NULL)
                return;
        if (portp->tx.buf == NULL)
                return;
 
        stl_startrxtx(portp, -1, 1);
}
 
/*****************************************************************************/
 
static int stl_writeroom(struct tty_struct *tty)
{
        struct stlport  *portp;
        char            *head, *tail;
 
        pr_debug("stl_writeroom(tty=%p)\n", tty);
 
        if (tty == NULL)
                return 0;
        portp = tty->driver_data;
        if (portp == NULL)
                return 0;
        if (portp->tx.buf == NULL)
                return 0;
 
        head = portp->tx.head;
        tail = portp->tx.tail;
        return (head >= tail) ? (STL_TXBUFSIZE - (head - tail) - 1) : (tail - head - 1);
}
 
/*****************************************************************************/
 
/*
 *      Return number of chars in the TX buffer. Normally we would just
 *      calculate the number of chars in the buffer and return that, but if
 *      the buffer is empty and TX interrupts are still on then we return
 *      that the buffer still has 1 char in it. This way whoever called us
 *      will not think that ALL chars have drained - since the UART still
 *      must have some chars in it (we are busy after all).
 */
 
static int stl_charsinbuffer(struct tty_struct *tty)
{
        struct stlport  *portp;
        unsigned int    size;
        char            *head, *tail;
 
        pr_debug("stl_charsinbuffer(tty=%p)\n", tty);
 
        if (tty == NULL)
                return 0;
        portp = tty->driver_data;
        if (portp == NULL)
                return 0;
        if (portp->tx.buf == NULL)
                return 0;
 
        head = portp->tx.head;
        tail = portp->tx.tail;
        size = (head >= tail) ? (head - tail) : (STL_TXBUFSIZE - (tail - head));
        if ((size == 0) && test_bit(ASYI_TXBUSY, &portp->istate))
                size = 1;
        return size;
}
 
/*****************************************************************************/
 
/*
 *      Generate the serial struct info.
 */
 
static int stl_getserial(struct stlport *portp, struct serial_struct __user *sp)
{
        struct serial_struct    sio;
        struct stlbrd           *brdp;
 
        pr_debug("stl_getserial(portp=%p,sp=%p)\n", portp, sp);
 
        memset(&sio, 0, sizeof(struct serial_struct));
        sio.line = portp->portnr;
        sio.port = portp->ioaddr;
        sio.flags = portp->flags;
        sio.baud_base = portp->baud_base;
        sio.close_delay = portp->close_delay;
        sio.closing_wait = portp->closing_wait;
        sio.custom_divisor = portp->custom_divisor;
        sio.hub6 = 0;
        if (portp->uartp == &stl_cd1400uart) {
                sio.type = PORT_CIRRUS;
                sio.xmit_fifo_size = CD1400_TXFIFOSIZE;
        } else {
                sio.type = PORT_UNKNOWN;
                sio.xmit_fifo_size = SC26198_TXFIFOSIZE;
        }
 
        brdp = stl_brds[portp->brdnr];
        if (brdp != NULL)
                sio.irq = brdp->irq;
 
        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 stl_setserial(struct stlport *portp, struct serial_struct __user *sp)
{
        struct serial_struct    sio;
 
        pr_debug("stl_setserial(portp=%p,sp=%p)\n", portp, sp);
 
        if (copy_from_user(&sio, sp, sizeof(struct serial_struct)))
                return -EFAULT;
        if (!capable(CAP_SYS_ADMIN)) {
                if ((sio.baud_base != portp->baud_base) ||
                    (sio.close_delay != portp->close_delay) ||
                    ((sio.flags & ~ASYNC_USR_MASK) !=
                    (portp->flags & ~ASYNC_USR_MASK)))
                        return -EPERM;
        }
 
        portp->flags = (portp->flags & ~ASYNC_USR_MASK) |
                (sio.flags & ASYNC_USR_MASK);
        portp->baud_base = sio.baud_base;
        portp->close_delay = sio.close_delay;
        portp->closing_wait = sio.closing_wait;
        portp->custom_divisor = sio.custom_divisor;
        stl_setport(portp, portp->tty->termios);
        return 0;
}
 
/*****************************************************************************/
 
static int stl_tiocmget(struct tty_struct *tty, struct file *file)
{
        struct stlport  *portp;
 
        if (tty == NULL)
                return -ENODEV;
        portp = tty->driver_data;
        if (portp == NULL)
                return -ENODEV;
        if (tty->flags & (1 << TTY_IO_ERROR))
                return -EIO;
 
        return stl_getsignals(portp);
}
 
static int stl_tiocmset(struct tty_struct *tty, struct file *file,
                        unsigned int set, unsigned int clear)
{
        struct stlport  *portp;
        int rts = -1, dtr = -1;
 
        if (tty == NULL)
                return -ENODEV;
        portp = tty->driver_data;
        if (portp == NULL)
                return -ENODEV;
        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;
 
        stl_setsignals(portp, dtr, rts);
        return 0;
}
 
static int stl_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
{
        struct stlport  *portp;
        unsigned int    ival;
        int             rc;
        void __user *argp = (void __user *)arg;
 
        pr_debug("stl_ioctl(tty=%p,file=%p,cmd=%x,arg=%lx)\n", tty, file, cmd,
                        arg);
 
        if (tty == NULL)
                return -ENODEV;
        portp = tty->driver_data;
        if (portp == NULL)
                return -ENODEV;
 
        if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
            (cmd != COM_GETPORTSTATS) && (cmd != COM_CLRPORTSTATS))
                if (tty->flags & (1 << TTY_IO_ERROR))
                        return -EIO;
 
        rc = 0;
 
        switch (cmd) {
        case TIOCGSOFTCAR:
                rc = put_user(((tty->termios->c_cflag & CLOCAL) ? 1 : 0),
                        (unsigned __user *) argp);
                break;
        case TIOCSSOFTCAR:
                if (get_user(ival, (unsigned int __user *) arg))
                        return -EFAULT;
                tty->termios->c_cflag =
                                (tty->termios->c_cflag & ~CLOCAL) |
                                (ival ? CLOCAL : 0);
                break;
        case TIOCGSERIAL:
                rc = stl_getserial(portp, argp);
                break;
        case TIOCSSERIAL:
                rc = stl_setserial(portp, argp);
                break;
        case COM_GETPORTSTATS:
                rc = stl_getportstats(portp, argp);
                break;
        case COM_CLRPORTSTATS:
                rc = stl_clrportstats(portp, argp);
                break;
        case TIOCSERCONFIG:
        case TIOCSERGWILD:
        case TIOCSERSWILD:
        case TIOCSERGETLSR:
        case TIOCSERGSTRUCT:
        case TIOCSERGETMULTI:
        case TIOCSERSETMULTI:
        default:
                rc = -ENOIOCTLCMD;
                break;
        }
 
        return rc;
}
 
/*****************************************************************************/
 
/*
 *      Start the transmitter again. Just turn TX interrupts back on.
 */
 
static void stl_start(struct tty_struct *tty)
{
        struct stlport  *portp;
 
        pr_debug("stl_start(tty=%p)\n", tty);
 
        if (tty == NULL)
                return;
        portp = tty->driver_data;
        if (portp == NULL)
                return;
        stl_startrxtx(portp, -1, 1);
}
 
/*****************************************************************************/
 
static void stl_settermios(struct tty_struct *tty, struct ktermios *old)
{
        struct stlport  *portp;
        struct ktermios *tiosp;
 
        pr_debug("stl_settermios(tty=%p,old=%p)\n", tty, old);
 
        if (tty == NULL)
                return;
        portp = tty->driver_data;
        if (portp == NULL)
                return;
 
        tiosp = tty->termios;
        if ((tiosp->c_cflag == old->c_cflag) &&
            (tiosp->c_iflag == old->c_iflag))
                return;
 
        stl_setport(portp, tiosp);
        stl_setsignals(portp, ((tiosp->c_cflag & (CBAUD & ~CBAUDEX)) ? 1 : 0),
                -1);
        if ((old->c_cflag & CRTSCTS) && ((tiosp->c_cflag & CRTSCTS) == 0)) {
                tty->hw_stopped = 0;
                stl_start(tty);
        }
        if (((old->c_cflag & CLOCAL) == 0) && (tiosp->c_cflag & CLOCAL))
                wake_up_interruptible(&portp->open_wait);
}
 
/*****************************************************************************/
 
/*
 *      Attempt to flow control who ever is sending us data. Based on termios
 *      settings use software or/and hardware flow control.
 */
 
static void stl_throttle(struct tty_struct *tty)
{
        struct stlport  *portp;
 
        pr_debug("stl_throttle(tty=%p)\n", tty);
 
        if (tty == NULL)
                return;
        portp = tty->driver_data;
        if (portp == NULL)
                return;
        stl_flowctrl(portp, 0);
}
 
/*****************************************************************************/
 
/*
 *      Unflow control the device sending us data...
 */
 
static void stl_unthrottle(struct tty_struct *tty)
{
        struct stlport  *portp;
 
        pr_debug("stl_unthrottle(tty=%p)\n", tty);
 
        if (tty == NULL)
                return;
        portp = tty->driver_data;
        if (portp == NULL)
                return;
        stl_flowctrl(portp, 1);
}
 
/*****************************************************************************/
 
/*
 *      Stop the transmitter. Basically to do this we will just turn TX
 *      interrupts off.
 */
 
static void stl_stop(struct tty_struct *tty)
{
        struct stlport  *portp;
 
        pr_debug("stl_stop(tty=%p)\n", tty);
 
        if (tty == NULL)
                return;
        portp = tty->driver_data;
        if (portp == NULL)
                return;
        stl_startrxtx(portp, -1, 0);
}
 
/*****************************************************************************/
 
/*
 *      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.
 */
 
static void stl_hangup(struct tty_struct *tty)
{
        struct stlport  *portp;
 
        pr_debug("stl_hangup(tty=%p)\n", tty);
 
        if (tty == NULL)
                return;
        portp = tty->driver_data;
        if (portp == NULL)
                return;
 
        portp->flags &= ~ASYNC_INITIALIZED;
        stl_disableintrs(portp);
        if (tty->termios->c_cflag & HUPCL)
                stl_setsignals(portp, 0, 0);
        stl_enablerxtx(portp, 0, 0);
        stl_flushbuffer(tty);
        portp->istate = 0;
        set_bit(TTY_IO_ERROR, &tty->flags);
        if (portp->tx.buf != NULL) {
                kfree(portp->tx.buf);
                portp->tx.buf = NULL;
                portp->tx.head = NULL;
                portp->tx.tail = NULL;
        }
        portp->tty = NULL;
        portp->flags &= ~ASYNC_NORMAL_ACTIVE;
        portp->refcount = 0;
        wake_up_interruptible(&portp->open_wait);
}
 
/*****************************************************************************/
 
static void stl_breakctl(struct tty_struct *tty, int state)
{
        struct stlport  *portp;
 
        pr_debug("stl_breakctl(tty=%p,state=%d)\n", tty, state);
 
        if (tty == NULL)
                return;
        portp = tty->driver_data;
        if (portp == NULL)
                return;
 
        stl_sendbreak(portp, ((state == -1) ? 1 : 2));
}
 
/*****************************************************************************/
 
static void stl_sendxchar(struct tty_struct *tty, char ch)
{
        struct stlport  *portp;
 
        pr_debug("stl_sendxchar(tty=%p,ch=%x)\n", tty, ch);
 
        if (tty == NULL)
                return;
        portp = tty->driver_data;
        if (portp == NULL)
                return;
 
        if (ch == STOP_CHAR(tty))
                stl_sendflow(portp, 0);
        else if (ch == START_CHAR(tty))
                stl_sendflow(portp, 1);
        else
                stl_putchar(tty, ch);
}
 
/*****************************************************************************/
 
#define MAXLINE         80
 
/*
 *      Format info for a specified port. The line is deliberately limited
 *      to 80 characters. (If it is too long it will be truncated, if too
 *      short then padded with spaces).
 */
 
static int stl_portinfo(struct stlport *portp, int portnr, char *pos)
{
        char    *sp;
        int     sigs, cnt;
 
        sp = pos;
        sp += sprintf(sp, "%d: uart:%s tx:%d rx:%d",
                portnr, (portp->hwid == 1) ? "SC26198" : "CD1400",
                (int) portp->stats.txtotal, (int) portp->stats.rxtotal);
 
        if (portp->stats.rxframing)
                sp += sprintf(sp, " fe:%d", (int) portp->stats.rxframing);
        if (portp->stats.rxparity)
                sp += sprintf(sp, " pe:%d", (int) portp->stats.rxparity);
        if (portp->stats.rxbreaks)
                sp += sprintf(sp, " brk:%d", (int) portp->stats.rxbreaks);
        if (portp->stats.rxoverrun)
                sp += sprintf(sp, " oe:%d", (int) portp->stats.rxoverrun);
 
        sigs = stl_getsignals(portp);
        cnt = sprintf(sp, "%s%s%s%s%s ",
                (sigs & TIOCM_RTS) ? "|RTS" : "",
                (sigs & TIOCM_CTS) ? "|CTS" : "",
                (sigs & TIOCM_DTR) ? "|DTR" : "",
                (sigs & TIOCM_CD) ? "|DCD" : "",
                (sigs & TIOCM_DSR) ? "|DSR" : "");
        *sp = ' ';
        sp += cnt;
 
        for (cnt = sp - pos; cnt < (MAXLINE - 1); cnt++)
                *sp++ = ' ';
        if (cnt >= MAXLINE)
                pos[(MAXLINE - 2)] = '+';
        pos[(MAXLINE - 1)] = '\n';
 
        return MAXLINE;
}
 
/*****************************************************************************/
 
/*
 *      Port info, read from the /proc file system.
 */
 
static int stl_readproc(char *page, char **start, off_t off, int count, int *eof, void *data)
{
        struct stlbrd   *brdp;
        struct stlpanel *panelp;
        struct stlport  *portp;
        unsigned int    brdnr, panelnr, portnr;
        int             totalport, curoff, maxoff;
        char            *pos;
 
        pr_debug("stl_readproc(page=%p,start=%p,off=%lx,count=%d,eof=%p,"
                "data=%p\n", page, start, off, count, eof, data);
 
        pos = page;
        totalport = 0;
        curoff = 0;
 
        if (off == 0) {
                pos += sprintf(pos, "%s: version %s", stl_drvtitle,
                        stl_drvversion);
                while (pos < (page + MAXLINE - 1))
                        *pos++ = ' ';
                *pos++ = '\n';
        }
        curoff =  MAXLINE;
 
/*
 *      We scan through for each board, panel and port. The offset is
 *      calculated on the fly, and irrelevant ports are skipped.
 */
        for (brdnr = 0; brdnr < stl_nrbrds; brdnr++) {
                brdp = stl_brds[brdnr];
                if (brdp == NULL)
                        continue;
                if (brdp->state == 0)
                        continue;
 
                maxoff = curoff + (brdp->nrports * MAXLINE);
                if (off >= maxoff) {
                        curoff = maxoff;
                        continue;
                }
 
                totalport = brdnr * STL_MAXPORTS;
                for (panelnr = 0; panelnr < brdp->nrpanels; panelnr++) {
                        panelp = brdp->panels[panelnr];
                        if (panelp == NULL)
                                continue;
 
                        maxoff = curoff + (panelp->nrports * MAXLINE);
                        if (off >= maxoff) {
                                curoff = maxoff;
                                totalport += panelp->nrports;
                                continue;
                        }
 
                        for (portnr = 0; portnr < panelp->nrports; portnr++,
                            totalport++) {
                                portp = panelp->ports[portnr];
                                if (portp == NULL)
                                        continue;
                                if (off >= (curoff += MAXLINE))
                                        continue;
                                if ((pos - page + MAXLINE) > count)
                                        goto stl_readdone;
                                pos += stl_portinfo(portp, totalport, pos);
                        }
                }
        }
 
        *eof = 1;
 
stl_readdone:
        *start = page;
        return pos - page;
}
 
/*****************************************************************************/
 
/*
 *      All board interrupts are vectored through here first. This code then
 *      calls off to the approrpriate board interrupt handlers.
 */
 
static irqreturn_t stl_intr(int irq, void *dev_id)
{
        struct stlbrd *brdp = dev_id;
 
        pr_debug("stl_intr(brdp=%p,irq=%d)\n", brdp, irq);
 
        return IRQ_RETVAL((* brdp->isr)(brdp));
}
 
/*****************************************************************************/
 
/*
 *      Interrupt service routine for EasyIO board types.
 */
 
static int stl_eiointr(struct stlbrd *brdp)
{
        struct stlpanel *panelp;
        unsigned int    iobase;
        int             handled = 0;
 
        spin_lock(&brd_lock);
        panelp = brdp->panels[0];
        iobase = panelp->iobase;
        while (inb(brdp->iostatus) & EIO_INTRPEND) {
                handled = 1;
                (* panelp->isr)(panelp, iobase);
        }
        spin_unlock(&brd_lock);
        return handled;
}
 
/*****************************************************************************/
 
/*
 *      Interrupt service routine for ECH-AT board types.
 */
 
static int stl_echatintr(struct stlbrd *brdp)
{
        struct stlpanel *panelp;
        unsigned int    ioaddr, bnknr;
        int             handled = 0;
 
        outb((brdp->ioctrlval | ECH_BRDENABLE), brdp->ioctrl);
 
        while (inb(brdp->iostatus) & ECH_INTRPEND) {
                handled = 1;
                for (bnknr = 0; bnknr < brdp->nrbnks; bnknr++) {
                        ioaddr = brdp->bnkstataddr[bnknr];
                        if (inb(ioaddr) & ECH_PNLINTRPEND) {
                                panelp = brdp->bnk2panel[bnknr];
                                (* panelp->isr)(panelp, (ioaddr & 0xfffc));
                        }
                }
        }
 
        outb((brdp->ioctrlval | ECH_BRDDISABLE), brdp->ioctrl);
 
        return handled;
}
 
/*****************************************************************************/
 
/*
 *      Interrupt service routine for ECH-MCA board types.
 */
 
static int stl_echmcaintr(struct stlbrd *brdp)
{
        struct stlpanel *panelp;
        unsigned int    ioaddr, bnknr;
        int             handled = 0;
 
        while (inb(brdp->iostatus) & ECH_INTRPEND) {
                handled = 1;
                for (bnknr = 0; bnknr < brdp->nrbnks; bnknr++) {
                        ioaddr = brdp->bnkstataddr[bnknr];
                        if (inb(ioaddr) & ECH_PNLINTRPEND) {
                                panelp = brdp->bnk2panel[bnknr];
                                (* panelp->isr)(panelp, (ioaddr & 0xfffc));
                        }
                }
        }
        return handled;
}
 
/*****************************************************************************/
 
/*
 *      Interrupt service routine for ECH-PCI board types.
 */
 
static int stl_echpciintr(struct stlbrd *brdp)
{
        struct stlpanel *panelp;
        unsigned int    ioaddr, bnknr, recheck;
        int             handled = 0;
 
        while (1) {
                recheck = 0;
                for (bnknr = 0; bnknr < brdp->nrbnks; bnknr++) {
                        outb(brdp->bnkpageaddr[bnknr], brdp->ioctrl);
                        ioaddr = brdp->bnkstataddr[bnknr];
                        if (inb(ioaddr) & ECH_PNLINTRPEND) {
                                panelp = brdp->bnk2panel[bnknr];
                                (* panelp->isr)(panelp, (ioaddr & 0xfffc));
                                recheck++;
                                handled = 1;
                        }
                }
                if (! recheck)
                        break;
        }
        return handled;
}
 
/*****************************************************************************/
 
/*
 *      Interrupt service routine for ECH-8/64-PCI board types.
 */
 
static int stl_echpci64intr(struct stlbrd *brdp)
{
        struct stlpanel *panelp;
        unsigned int    ioaddr, bnknr;
        int             handled = 0;
 
        while (inb(brdp->ioctrl) & 0x1) {
                handled = 1;
                for (bnknr = 0; bnknr < brdp->nrbnks; bnknr++) {
                        ioaddr = brdp->bnkstataddr[bnknr];
                        if (inb(ioaddr) & ECH_PNLINTRPEND) {
                                panelp = brdp->bnk2panel[bnknr];
                                (* panelp->isr)(panelp, (ioaddr & 0xfffc));
                        }
                }
        }
 
        return handled;
}
 
/*****************************************************************************/
 
/*
 *      Service an off-level request for some channel.
 */
static void stl_offintr(struct work_struct *work)
{
        struct stlport          *portp = container_of(work, struct stlport, tqueue);
        struct tty_struct       *tty;
        unsigned int            oldsigs;
 
        pr_debug("stl_offintr(portp=%p)\n", portp);
 
        if (portp == NULL)
                return;
 
        tty = portp->tty;
        if (tty == NULL)
                return;
 
        if (test_bit(ASYI_TXLOW, &portp->istate))
                tty_wakeup(tty);
 
        if (test_bit(ASYI_DCDCHANGE, &portp->istate)) {
                clear_bit(ASYI_DCDCHANGE, &portp->istate);
                oldsigs = portp->sigs;
                portp->sigs = stl_getsignals(portp);
                if ((portp->sigs & TIOCM_CD) && ((oldsigs & TIOCM_CD) == 0))
                        wake_up_interruptible(&portp->open_wait);
                if ((oldsigs & TIOCM_CD) && ((portp->sigs & TIOCM_CD) == 0))
                        if (portp->flags & ASYNC_CHECK_CD)
                                tty_hangup(tty);        /* FIXME: module removal race here - AKPM */
        }
}
 
/*****************************************************************************/
 
/*
 *      Initialize all the ports on a panel.
 */
 
static int __devinit stl_initports(struct stlbrd *brdp, struct stlpanel *panelp)
{
        struct stlport *portp;
        unsigned int i;
        int chipmask;
 
        pr_debug("stl_initports(brdp=%p,panelp=%p)\n", brdp, panelp);
 
        chipmask = stl_panelinit(brdp, panelp);
 
/*
 *      All UART's are initialized (if found!). Now go through and setup
 *      each ports data structures.
 */
        for (i = 0; i < panelp->nrports; i++) {
                portp = kzalloc(sizeof(struct stlport), GFP_KERNEL);
                if (!portp) {
                        printk("STALLION: failed to allocate memory "
                                "(size=%Zd)\n", sizeof(struct stlport));
                        break;
                }
 
                portp->magic = STL_PORTMAGIC;
                portp->portnr = i;
                portp->brdnr = panelp->brdnr;
                portp->panelnr = panelp->panelnr;
                portp->uartp = panelp->uartp;
                portp->clk = brdp->clk;
                portp->baud_base = STL_BAUDBASE;
                portp->close_delay = STL_CLOSEDELAY;
                portp->closing_wait = 30 * HZ;
                INIT_WORK(&portp->tqueue, stl_offintr);
                init_waitqueue_head(&portp->open_wait);
                init_waitqueue_head(&portp->close_wait);
                portp->stats.brd = portp->brdnr;
                portp->stats.panel = portp->panelnr;
                portp->stats.port = portp->portnr;
                panelp->ports[i] = portp;
                stl_portinit(brdp, panelp, portp);
        }
 
        return 0;
}
 
static void stl_cleanup_panels(struct stlbrd *brdp)
{
        struct stlpanel *panelp;
        struct stlport *portp;
        unsigned int j, k;
 
        for (j = 0; j < STL_MAXPANELS; j++) {
                panelp = brdp->panels[j];
                if (panelp == NULL)
                        continue;
                for (k = 0; k < STL_PORTSPERPANEL; k++) {
                        portp = panelp->ports[k];
                        if (portp == NULL)
                                continue;
                        if (portp->tty != NULL)
                                stl_hangup(portp->tty);
                        kfree(portp->tx.buf);
                        kfree(portp);
                }
                kfree(panelp);
        }
}
 
/*****************************************************************************/
 
/*
 *      Try to find and initialize an EasyIO board.
 */
 
static int __devinit stl_initeio(struct stlbrd *brdp)
{
        struct stlpanel *panelp;
        unsigned int    status;
        char            *name;
        int             retval;
 
        pr_debug("stl_initeio(brdp=%p)\n", brdp);
 
        brdp->ioctrl = brdp->ioaddr1 + 1;
        brdp->iostatus = brdp->ioaddr1 + 2;
 
        status = inb(brdp->iostatus);
        if ((status & EIO_IDBITMASK) == EIO_MK3)
                brdp->ioctrl++;
 
/*
 *      Handle board specific stuff now. The real difference is PCI
 *      or not PCI.
 */
        if (brdp->brdtype == BRD_EASYIOPCI) {
                brdp->iosize1 = 0x80;
                brdp->iosize2 = 0x80;
                name = "serial(EIO-PCI)";
                outb(0x41, (brdp->ioaddr2 + 0x4c));
        } else {
                brdp->iosize1 = 8;
                name = "serial(EIO)";
                if ((brdp->irq < 0) || (brdp->irq > 15) ||
                    (stl_vecmap[brdp->irq] == (unsigned char) 0xff)) {
                        printk("STALLION: invalid irq=%d for brd=%d\n",
                                brdp->irq, brdp->brdnr);
                        retval = -EINVAL;
                        goto err;
                }
                outb((stl_vecmap[brdp->irq] | EIO_0WS |
                        ((brdp->irqtype) ? EIO_INTLEVEL : EIO_INTEDGE)),
                        brdp->ioctrl);
        }
 
        retval = -EBUSY;
        if (!request_region(brdp->ioaddr1, brdp->iosize1, name)) {
                printk(KERN_WARNING "STALLION: Warning, board %d I/O address "
                        "%x conflicts with another device\n", brdp->brdnr,
                        brdp->ioaddr1);
                goto err;
        }
 
        if (brdp->iosize2 > 0)
                if (!request_region(brdp->ioaddr2, brdp->iosize2, name)) {
                        printk(KERN_WARNING "STALLION: Warning, board %d I/O "
                                "address %x conflicts with another device\n",
                                brdp->brdnr, brdp->ioaddr2);
                        printk(KERN_WARNING "STALLION: Warning, also "
                                "releasing board %d I/O address %x \n",
                                brdp->brdnr, brdp->ioaddr1);
                        goto err_rel1;
                }
 
/*
 *      Everything looks OK, so let's go ahead and probe for the hardware.
 */
        brdp->clk = CD1400_CLK;
        brdp->isr = stl_eiointr;
 
        retval = -ENODEV;
        switch (status & EIO_IDBITMASK) {
        case EIO_8PORTM:
                brdp->clk = CD1400_CLK8M;
                /* fall thru */
        case EIO_8PORTRS:
        case EIO_8PORTDI:
                brdp->nrports = 8;
                break;
        case EIO_4PORTRS:
                brdp->nrports = 4;
                break;
        case EIO_MK3:
                switch (status & EIO_BRDMASK) {
                case ID_BRD4:
                        brdp->nrports = 4;
                        break;
                case ID_BRD8:
                        brdp->nrports = 8;
                        break;
                case ID_BRD16:
                        brdp->nrports = 16;
                        break;
                default:
                        goto err_rel2;
                }
                break;
        default:
                goto err_rel2;
        }
 
/*
 *      We have verified that the board is actually present, so now we
 *      can complete the setup.
 */
 
        panelp = kzalloc(sizeof(struct stlpanel), GFP_KERNEL);
        if (!panelp) {
                printk(KERN_WARNING "STALLION: failed to allocate memory "
                        "(size=%Zd)\n", sizeof(struct stlpanel));
                retval = -ENOMEM;
                goto err_rel2;
        }
 
        panelp->magic = STL_PANELMAGIC;
        panelp->brdnr = brdp->brdnr;
        panelp->panelnr = 0;
        panelp->nrports = brdp->nrports;
        panelp->iobase = brdp->ioaddr1;
        panelp->hwid = status;
        if ((status & EIO_IDBITMASK) == EIO_MK3) {
                panelp->uartp = &stl_sc26198uart;
                panelp->isr = stl_sc26198intr;
        } else {
                panelp->uartp = &stl_cd1400uart;
                panelp->isr = stl_cd1400eiointr;
        }
 
        brdp->panels[0] = panelp;
        brdp->nrpanels = 1;
        brdp->state |= BRD_FOUND;
        brdp->hwid = status;
        if (request_irq(brdp->irq, stl_intr, IRQF_SHARED, name, brdp) != 0) {
                printk("STALLION: failed to register interrupt "
                    "routine for %s irq=%d\n", name, brdp->irq);
                retval = -ENODEV;
                goto err_fr;
        }
 
        return 0;
err_fr:
        stl_cleanup_panels(brdp);
err_rel2:
        if (brdp->iosize2 > 0)
                release_region(brdp->ioaddr2, brdp->iosize2);
err_rel1:
        release_region(brdp->ioaddr1, brdp->iosize1);
err:
        return retval;
}
 
/*****************************************************************************/
 
/*
 *      Try to find an ECH board and initialize it. This code is capable of
 *      dealing with all types of ECH board.
 */
 
static int __devinit stl_initech(struct stlbrd *brdp)
{
        struct stlpanel *panelp;
        unsigned int    status, nxtid, ioaddr, conflict, panelnr, banknr, i;
        int             retval;
        char            *name;
 
        pr_debug("stl_initech(brdp=%p)\n", brdp);
 
        status = 0;
        conflict = 0;
 
/*
 *      Set up the initial board register contents for boards. This varies a
 *      bit between the different board types. So we need to handle each
 *      separately. Also do a check that the supplied IRQ is good.
 */
        switch (brdp->brdtype) {
 
        case BRD_ECH:
                brdp->isr = stl_echatintr;
                brdp->ioctrl = brdp->ioaddr1 + 1;
                brdp->iostatus = brdp->ioaddr1 + 1;
                status = inb(brdp->iostatus);
                if ((status & ECH_IDBITMASK) != ECH_ID) {
                        retval = -ENODEV;
                        goto err;
                }
                if ((brdp->irq < 0) || (brdp->irq > 15) ||
                    (stl_vecmap[brdp->irq] == (unsigned char) 0xff)) {
                        printk("STALLION: invalid irq=%d for brd=%d\n",
                                brdp->irq, brdp->brdnr);
                        retval = -EINVAL;
                        goto err;
                }
                status = ((brdp->ioaddr2 & ECH_ADDR2MASK) >> 1);
                status |= (stl_vecmap[brdp->irq] << 1);
                outb((status | ECH_BRDRESET), brdp->ioaddr1);
                brdp->ioctrlval = ECH_INTENABLE |
                        ((brdp->irqtype) ? ECH_INTLEVEL : ECH_INTEDGE);
                for (i = 0; i < 10; i++)
                        outb((brdp->ioctrlval | ECH_BRDENABLE), brdp->ioctrl);
                brdp->iosize1 = 2;
                brdp->iosize2 = 32;
                name = "serial(EC8/32)";
                outb(status, brdp->ioaddr1);
                break;
 
        case BRD_ECHMC:
                brdp->isr = stl_echmcaintr;
                brdp->ioctrl = brdp->ioaddr1 + 0x20;
                brdp->iostatus = brdp->ioctrl;
                status = inb(brdp->iostatus);
                if ((status & ECH_IDBITMASK) != ECH_ID) {
                        retval = -ENODEV;
                        goto err;
                }
                if ((brdp->irq < 0) || (brdp->irq > 15) ||
                    (stl_vecmap[brdp->irq] == (unsigned char) 0xff)) {
                        printk("STALLION: invalid irq=%d for brd=%d\n",
                                brdp->irq, brdp->brdnr);
                        retval = -EINVAL;
                        goto err;
                }
                outb(ECHMC_BRDRESET, brdp->ioctrl);
                outb(ECHMC_INTENABLE, brdp->ioctrl);
                brdp->iosize1 = 64;
                name = "serial(EC8/32-MC)";
                break;
 
        case BRD_ECHPCI:
                brdp->isr = stl_echpciintr;
                brdp->ioctrl = brdp->ioaddr1 + 2;
                brdp->iosize1 = 4;
                brdp->iosize2 = 8;
                name = "serial(EC8/32-PCI)";
                break;
 
        case BRD_ECH64PCI:
                brdp->isr = stl_echpci64intr;
                brdp->ioctrl = brdp->ioaddr2 + 0x40;
                outb(0x43, (brdp->ioaddr1 + 0x4c));
                brdp->iosize1 = 0x80;
                brdp->iosize2 = 0x80;
                name = "serial(EC8/64-PCI)";
                break;
 
        default:
                printk("STALLION: unknown board type=%d\n", brdp->brdtype);
                retval = -EINVAL;
                goto err;
        }
 
/*
 *      Check boards for possible IO address conflicts and return fail status
 *      if an IO conflict found.
 */
        retval = -EBUSY;
        if (!request_region(brdp->ioaddr1, brdp->iosize1, name)) {
                printk(KERN_WARNING "STALLION: Warning, board %d I/O address "
                        "%x conflicts with another device\n", brdp->brdnr,
                        brdp->ioaddr1);
                goto err;
        }
 
        if (brdp->iosize2 > 0)
                if (!request_region(brdp->ioaddr2, brdp->iosize2, name)) {
                        printk(KERN_WARNING "STALLION: Warning, board %d I/O "
                                "address %x conflicts with another device\n",
                                brdp->brdnr, brdp->ioaddr2);
                        printk(KERN_WARNING "STALLION: Warning, also "
                                "releasing board %d I/O address %x \n",
                                brdp->brdnr, brdp->ioaddr1);
                        goto err_rel1;
                }
 
/*
 *      Scan through the secondary io address space looking for panels.
 *      As we find'em allocate and initialize panel structures for each.
 */
        brdp->clk = CD1400_CLK;
        brdp->hwid = status;
 
        ioaddr = brdp->ioaddr2;
        banknr = 0;
        panelnr = 0;
        nxtid = 0;
 
        for (i = 0; i < STL_MAXPANELS; i++) {
                if (brdp->brdtype == BRD_ECHPCI) {
                        outb(nxtid, brdp->ioctrl);
                        ioaddr = brdp->ioaddr2;
                }
                status = inb(ioaddr + ECH_PNLSTATUS);
                if ((status & ECH_PNLIDMASK) != nxtid)
                        break;
                panelp = kzalloc(sizeof(struct stlpanel), GFP_KERNEL);
                if (!panelp) {
                        printk("STALLION: failed to allocate memory "
                                "(size=%Zd)\n", sizeof(struct stlpanel));
                        retval = -ENOMEM;
                        goto err_fr;
                }
                panelp->magic = STL_PANELMAGIC;
                panelp->brdnr = brdp->brdnr;
                panelp->panelnr = panelnr;
                panelp->iobase = ioaddr;
                panelp->pagenr = nxtid;
                panelp->hwid = status;
                brdp->bnk2panel[banknr] = panelp;
                brdp->bnkpageaddr[banknr] = nxtid;
                brdp->bnkstataddr[banknr++] = ioaddr + ECH_PNLSTATUS;
 
                if (status & ECH_PNLXPID) {
                        panelp->uartp = &stl_sc26198uart;
                        panelp->isr = stl_sc26198intr;
                        if (status & ECH_PNL16PORT) {
                                panelp->nrports = 16;
                                brdp->bnk2panel[banknr] = panelp;
                                brdp->bnkpageaddr[banknr] = nxtid;
                                brdp->bnkstataddr[banknr++] = ioaddr + 4 +
                                        ECH_PNLSTATUS;
                        } else
                                panelp->nrports = 8;
                } else {
                        panelp->uartp = &stl_cd1400uart;
                        panelp->isr = stl_cd1400echintr;
                        if (status & ECH_PNL16PORT) {
                                panelp->nrports = 16;
                                panelp->ackmask = 0x80;
                                if (brdp->brdtype != BRD_ECHPCI)
                                        ioaddr += EREG_BANKSIZE;
                                brdp->bnk2panel[banknr] = panelp;
                                brdp->bnkpageaddr[banknr] = ++nxtid;
                                brdp->bnkstataddr[banknr++] = ioaddr +
                                        ECH_PNLSTATUS;
                        } else {
                                panelp->nrports = 8;
                                panelp->ackmask = 0xc0;
                        }
                }
 
                nxtid++;
                ioaddr += EREG_BANKSIZE;
                brdp->nrports += panelp->nrports;
                brdp->panels[panelnr++] = panelp;
                if ((brdp->brdtype != BRD_ECHPCI) &&
                    (ioaddr >= (brdp->ioaddr2 + brdp->iosize2))) {
                        retval = -EINVAL;
                        goto err_fr;
                }
        }
 
        brdp->nrpanels = panelnr;
        brdp->nrbnks = banknr;
        if (brdp->brdtype == BRD_ECH)
                outb((brdp->ioctrlval | ECH_BRDDISABLE), brdp->ioctrl);
 
        brdp->state |= BRD_FOUND;
        if (request_irq(brdp->irq, stl_intr, IRQF_SHARED, name, brdp) != 0) {
                printk("STALLION: failed to register interrupt "
                    "routine for %s irq=%d\n", name, brdp->irq);
                retval = -ENODEV;
                goto err_fr;
        }
 
        return 0;
err_fr:
        stl_cleanup_panels(brdp);
        if (brdp->iosize2 > 0)
                release_region(brdp->ioaddr2, brdp->iosize2);
err_rel1:
        release_region(brdp->ioaddr1, brdp->iosize1);
err:
        return retval;
}
 
/*****************************************************************************/
 
/*
 *      Initialize and configure the specified board.
 *      Scan through all the boards in the configuration and see what we
 *      can find. Handle EIO and the ECH boards a little differently here
 *      since the initial search and setup is very different.
 */
 
static int __devinit stl_brdinit(struct stlbrd *brdp)
{
        int i, retval;
 
        pr_debug("stl_brdinit(brdp=%p)\n", brdp);
 
        switch (brdp->brdtype) {
        case BRD_EASYIO:
        case BRD_EASYIOPCI:
                retval = stl_initeio(brdp);
                if (retval)
                        goto err;
                break;
        case BRD_ECH:
        case BRD_ECHMC:
        case BRD_ECHPCI:
        case BRD_ECH64PCI:
                retval = stl_initech(brdp);
                if (retval)
                        goto err;
                break;
        default:
                printk("STALLION: board=%d is unknown board type=%d\n",
                        brdp->brdnr, brdp->brdtype);
                retval = -ENODEV;
                goto err;
        }
 
        if ((brdp->state & BRD_FOUND) == 0) {
                printk("STALLION: %s board not found, board=%d io=%x irq=%d\n",
                        stl_brdnames[brdp->brdtype], brdp->brdnr,
                        brdp->ioaddr1, brdp->irq);
                goto err_free;
        }
 
        for (i = 0; i < STL_MAXPANELS; i++)
                if (brdp->panels[i] != NULL)
                        stl_initports(brdp, brdp->panels[i]);
 
        printk("STALLION: %s found, board=%d io=%x irq=%d "
                "nrpanels=%d nrports=%d\n", stl_brdnames[brdp->brdtype],
                brdp->brdnr, brdp->ioaddr1, brdp->irq, brdp->nrpanels,
                brdp->nrports);
 
        return 0;
err_free:
        free_irq(brdp->irq, brdp);
 
        stl_cleanup_panels(brdp);
 
        release_region(brdp->ioaddr1, brdp->iosize1);
        if (brdp->iosize2 > 0)
                release_region(brdp->ioaddr2, brdp->iosize2);
err:
        return retval;
}
 
/*****************************************************************************/
 
/*
 *      Find the next available board number that is free.
 */
 
static int __devinit stl_getbrdnr(void)
{
        unsigned int i;
 
        for (i = 0; i < STL_MAXBRDS; i++)
                if (stl_brds[i] == NULL) {
                        if (i >= stl_nrbrds)
                                stl_nrbrds = i + 1;
                        return i;
                }
 
        return -1;
}
 
/*****************************************************************************/
/*
 *      We have a Stallion board. Allocate a board structure and
 *      initialize it. Read its IO and IRQ resources from PCI
 *      configuration space.
 */
 
static int __devinit stl_pciprobe(struct pci_dev *pdev,
                const struct pci_device_id *ent)
{
        struct stlbrd *brdp;
        unsigned int i, brdtype = ent->driver_data;
        int brdnr, retval = -ENODEV;
 
        if ((pdev->class >> 8) == PCI_CLASS_STORAGE_IDE)
                goto err;
 
        retval = pci_enable_device(pdev);
        if (retval)
                goto err;
        brdp = stl_allocbrd();
        if (brdp == NULL) {
                retval = -ENOMEM;
                goto err;
        }
        mutex_lock(&stl_brdslock);
        brdnr = stl_getbrdnr();
        if (brdnr < 0) {
                dev_err(&pdev->dev, "too many boards found, "
                        "maximum supported %d\n", STL_MAXBRDS);
                mutex_unlock(&stl_brdslock);
                retval = -ENODEV;
                goto err_fr;
        }
        brdp->brdnr = (unsigned int)brdnr;
        stl_brds[brdp->brdnr] = brdp;
        mutex_unlock(&stl_brdslock);
 
        brdp->brdtype = brdtype;
        brdp->state |= STL_PROBED;
 
/*
 *      We have all resources from the board, so let's setup the actual
 *      board structure now.
 */
        switch (brdtype) {
        case BRD_ECHPCI:
                brdp->ioaddr2 = pci_resource_start(pdev, 0);
                brdp->ioaddr1 = pci_resource_start(pdev, 1);
                break;
        case BRD_ECH64PCI:
                brdp->ioaddr2 = pci_resource_start(pdev, 2);
                brdp->ioaddr1 = pci_resource_start(pdev, 1);
                break;
        case BRD_EASYIOPCI:
                brdp->ioaddr1 = pci_resource_start(pdev, 2);
                brdp->ioaddr2 = pci_resource_start(pdev, 1);
                break;
        default:
                dev_err(&pdev->dev, "unknown PCI board type=%u\n", brdtype);
                break;
        }
 
        brdp->irq = pdev->irq;
        retval = stl_brdinit(brdp);
        if (retval)
                goto err_null;
 
        pci_set_drvdata(pdev, brdp);
 
        for (i = 0; i < brdp->nrports; i++)
                tty_register_device(stl_serial,
                                brdp->brdnr * STL_MAXPORTS + i, &pdev->dev);
 
        return 0;
err_null:
        stl_brds[brdp->brdnr] = NULL;
err_fr:
        kfree(brdp);
err:
        return retval;
}
 
static void __devexit stl_pciremove(struct pci_dev *pdev)
{
        struct stlbrd *brdp = pci_get_drvdata(pdev);
        unsigned int i;
 
        free_irq(brdp->irq, brdp);
 
        stl_cleanup_panels(brdp);
 
        release_region(brdp->ioaddr1, brdp->iosize1);
        if (brdp->iosize2 > 0)
                release_region(brdp->ioaddr2, brdp->iosize2);
 
        for (i = 0; i < brdp->nrports; i++)
                tty_unregister_device(stl_serial,
                                brdp->brdnr * STL_MAXPORTS + i);
 
        stl_brds[brdp->brdnr] = NULL;
        kfree(brdp);
}
 
static struct pci_driver stl_pcidriver = {
        .name = "stallion",
        .id_table = stl_pcibrds,
        .probe = stl_pciprobe,
        .remove = __devexit_p(stl_pciremove)
};
 
/*****************************************************************************/
 
/*
 *      Return the board stats structure to user app.
 */
 
static int stl_getbrdstats(combrd_t __user *bp)
{
        combrd_t        stl_brdstats;
        struct stlbrd   *brdp;
        struct stlpanel *panelp;
        unsigned int i;
 
        if (copy_from_user(&stl_brdstats, bp, sizeof(combrd_t)))
                return -EFAULT;
        if (stl_brdstats.brd >= STL_MAXBRDS)
                return -ENODEV;
        brdp = stl_brds[stl_brdstats.brd];
        if (brdp == NULL)
                return -ENODEV;
 
        memset(&stl_brdstats, 0, sizeof(combrd_t));
        stl_brdstats.brd = brdp->brdnr;
        stl_brdstats.type = brdp->brdtype;
        stl_brdstats.hwid = brdp->hwid;
        stl_brdstats.state = brdp->state;
        stl_brdstats.ioaddr = brdp->ioaddr1;
        stl_brdstats.ioaddr2 = brdp->ioaddr2;
        stl_brdstats.irq = brdp->irq;
        stl_brdstats.nrpanels = brdp->nrpanels;
        stl_brdstats.nrports = brdp->nrports;
        for (i = 0; i < brdp->nrpanels; i++) {
                panelp = brdp->panels[i];
                stl_brdstats.panels[i].panel = i;
                stl_brdstats.panels[i].hwid = panelp->hwid;
                stl_brdstats.panels[i].nrports = panelp->nrports;
        }
 
        return copy_to_user(bp, &stl_brdstats, sizeof(combrd_t)) ? -EFAULT : 0;
}
 
/*****************************************************************************/
 
/*
 *      Resolve the referenced port number into a port struct pointer.
 */
 
static struct stlport *stl_getport(int brdnr, int panelnr, int portnr)
{
        struct stlbrd   *brdp;
        struct stlpanel *panelp;
 
        if (brdnr < 0 || brdnr >= STL_MAXBRDS)
                return NULL;
        brdp = stl_brds[brdnr];
        if (brdp == NULL)
                return NULL;
        if (panelnr < 0 || (unsigned int)panelnr >= brdp->nrpanels)
                return NULL;
        panelp = brdp->panels[panelnr];
        if (panelp == NULL)
                return NULL;
        if (portnr < 0 || (unsigned int)portnr >= panelp->nrports)
                return NULL;
        return panelp->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 stl_getportstats(struct stlport *portp, comstats_t __user *cp)
{
        comstats_t      stl_comstats;
        unsigned char   *head, *tail;
        unsigned long   flags;
 
        if (!portp) {
                if (copy_from_user(&stl_comstats, cp, sizeof(comstats_t)))
                        return -EFAULT;
                portp = stl_getport(stl_comstats.brd, stl_comstats.panel,
                        stl_comstats.port);
                if (portp == NULL)
                        return -ENODEV;
        }
 
        portp->stats.state = portp->istate;
        portp->stats.flags = portp->flags;
        portp->stats.hwid = portp->hwid;
 
        portp->stats.ttystate = 0;
        portp->stats.cflags = 0;
        portp->stats.iflags = 0;
        portp->stats.oflags = 0;
        portp->stats.lflags = 0;
        portp->stats.rxbuffered = 0;
 
        spin_lock_irqsave(&stallion_lock, flags);
        if (portp->tty != NULL)
                if (portp->tty->driver_data == portp) {
                        portp->stats.ttystate = portp->tty->flags;
                        /* No longer available as a statistic */
                        portp->stats.rxbuffered = 1; /*portp->tty->flip.count; */
                        if (portp->tty->termios != NULL) {
                                portp->stats.cflags = portp->tty->termios->c_cflag;
                                portp->stats.iflags = portp->tty->termios->c_iflag;
                                portp->stats.oflags = portp->tty->termios->c_oflag;
                                portp->stats.lflags = portp->tty->termios->c_lflag;
                        }
                }
        spin_unlock_irqrestore(&stallion_lock, flags);
 
        head = portp->tx.head;
        tail = portp->tx.tail;
        portp->stats.txbuffered = (head >= tail) ? (head - tail) :
                (STL_TXBUFSIZE - (tail - head));
 
        portp->stats.signals = (unsigned long) stl_getsignals(portp);
 
        return copy_to_user(cp, &portp->stats,
                            sizeof(comstats_t)) ? -EFAULT : 0;
}
 
/*****************************************************************************/
 
/*
 *      Clear the port stats structure. We also return it zeroed out...
 */
 
static int stl_clrportstats(struct stlport *portp, comstats_t __user *cp)
{
        comstats_t      stl_comstats;
 
        if (!portp) {
                if (copy_from_user(&stl_comstats, cp, sizeof(comstats_t)))
                        return -EFAULT;
                portp = stl_getport(stl_comstats.brd, stl_comstats.panel,
                        stl_comstats.port);
                if (portp == NULL)
                        return -ENODEV;
        }
 
        memset(&portp->stats, 0, sizeof(comstats_t));
        portp->stats.brd = portp->brdnr;
        portp->stats.panel = portp->panelnr;
        portp->stats.port = portp->portnr;
        return copy_to_user(cp, &portp->stats,
                            sizeof(comstats_t)) ? -EFAULT : 0;
}
 
/*****************************************************************************/
 
/*
 *      Return the entire driver ports structure to a user app.
 */
 
static int stl_getportstruct(struct stlport __user *arg)
{
        struct stlport  stl_dummyport;
        struct stlport  *portp;
 
        if (copy_from_user(&stl_dummyport, arg, sizeof(struct stlport)))
                return -EFAULT;
        portp = stl_getport(stl_dummyport.brdnr, stl_dummyport.panelnr,
                 stl_dummyport.portnr);
        if (!portp)
                return -ENODEV;
        return copy_to_user(arg, portp, sizeof(struct stlport)) ? -EFAULT : 0;
}
 
/*****************************************************************************/
 
/*
 *      Return the entire driver board structure to a user app.
 */
 
static int stl_getbrdstruct(struct stlbrd __user *arg)
{
        struct stlbrd   stl_dummybrd;
        struct stlbrd   *brdp;
 
        if (copy_from_user(&stl_dummybrd, arg, sizeof(struct stlbrd)))
                return -EFAULT;
        if (stl_dummybrd.brdnr >= STL_MAXBRDS)
                return -ENODEV;
        brdp = stl_brds[stl_dummybrd.brdnr];
        if (!brdp)
                return -ENODEV;
        return copy_to_user(arg, brdp, sizeof(struct stlbrd)) ? -EFAULT : 0;
}
 
/*****************************************************************************/
 
/*
 *      The "staliomem" device is also required to do some special operations
 *      on the board and/or ports. In this driver it is mostly used for stats
 *      collection.
 */
 
static int stl_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, unsigned long arg)
{
        int     brdnr, rc;
        void __user *argp = (void __user *)arg;
 
        pr_debug("stl_memioctl(ip=%p,fp=%p,cmd=%x,arg=%lx)\n", ip, fp, cmd,arg);
 
        brdnr = iminor(ip);
        if (brdnr >= STL_MAXBRDS)
                return -ENODEV;
        rc = 0;
 
        switch (cmd) {
        case COM_GETPORTSTATS:
                rc = stl_getportstats(NULL, argp);
                break;
        case COM_CLRPORTSTATS:
                rc = stl_clrportstats(NULL, argp);
                break;
        case COM_GETBRDSTATS:
                rc = stl_getbrdstats(argp);
                break;
        case COM_READPORT:
                rc = stl_getportstruct(argp);
                break;
        case COM_READBOARD:
                rc = stl_getbrdstruct(argp);
                break;
        default:
                rc = -ENOIOCTLCMD;
                break;
        }
 
        return rc;
}
 
static const struct tty_operations stl_ops = {
        .open = stl_open,
        .close = stl_close,
        .write = stl_write,
        .put_char = stl_putchar,
        .flush_chars = stl_flushchars,
        .write_room = stl_writeroom,
        .chars_in_buffer = stl_charsinbuffer,
        .ioctl = stl_ioctl,
        .set_termios = stl_settermios,
        .throttle = stl_throttle,
        .unthrottle = stl_unthrottle,
        .stop = stl_stop,
        .start = stl_start,
        .hangup = stl_hangup,
        .flush_buffer = stl_flushbuffer,
        .break_ctl = stl_breakctl,
        .wait_until_sent = stl_waituntilsent,
        .send_xchar = stl_sendxchar,
        .read_proc = stl_readproc,
        .tiocmget = stl_tiocmget,
        .tiocmset = stl_tiocmset,
};
 
/*****************************************************************************/
/*                       CD1400 HARDWARE FUNCTIONS                           */
/*****************************************************************************/
 
/*
 *      These functions get/set/update the registers of the cd1400 UARTs.
 *      Access to the cd1400 registers is via an address/data io port pair.
 *      (Maybe should make this inline...)
 */
 
static int stl_cd1400getreg(struct stlport *portp, int regnr)
{
        outb((regnr + portp->uartaddr), portp->ioaddr);
        return inb(portp->ioaddr + EREG_DATA);
}
 
static void stl_cd1400setreg(struct stlport *portp, int regnr, int value)
{
        outb(regnr + portp->uartaddr, portp->ioaddr);
        outb(value, portp->ioaddr + EREG_DATA);
}
 
static int stl_cd1400updatereg(struct stlport *portp, int regnr, int value)
{
        outb(regnr + portp->uartaddr, portp->ioaddr);
        if (inb(portp->ioaddr + EREG_DATA) != value) {
                outb(value, portp->ioaddr + EREG_DATA);
                return 1;
        }
        return 0;
}
 
/*****************************************************************************/
 
/*
 *      Inbitialize the UARTs in a panel. We don't care what sort of board
 *      these ports are on - since the port io registers are almost
 *      identical when dealing with ports.
 */
 
static int stl_cd1400panelinit(struct stlbrd *brdp, struct stlpanel *panelp)
{
        unsigned int    gfrcr;
        int             chipmask, i, j;
        int             nrchips, uartaddr, ioaddr;
        unsigned long   flags;
 
        pr_debug("stl_panelinit(brdp=%p,panelp=%p)\n", brdp, panelp);
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(panelp->brdnr, panelp->pagenr);
 
/*
 *      Check that each chip is present and started up OK.
 */
        chipmask = 0;
        nrchips = panelp->nrports / CD1400_PORTS;
        for (i = 0; i < nrchips; i++) {
                if (brdp->brdtype == BRD_ECHPCI) {
                        outb((panelp->pagenr + (i >> 1)), brdp->ioctrl);
                        ioaddr = panelp->iobase;
                } else
                        ioaddr = panelp->iobase + (EREG_BANKSIZE * (i >> 1));
                uartaddr = (i & 0x01) ? 0x080 : 0;
                outb((GFRCR + uartaddr), ioaddr);
                outb(0, (ioaddr + EREG_DATA));
                outb((CCR + uartaddr), ioaddr);
                outb(CCR_RESETFULL, (ioaddr + EREG_DATA));
                outb(CCR_RESETFULL, (ioaddr + EREG_DATA));
                outb((GFRCR + uartaddr), ioaddr);
                for (j = 0; j < CCR_MAXWAIT; j++)
                        if ((gfrcr = inb(ioaddr + EREG_DATA)) != 0)
                                break;
 
                if ((j >= CCR_MAXWAIT) || (gfrcr < 0x40) || (gfrcr > 0x60)) {
                        printk("STALLION: cd1400 not responding, "
                                "brd=%d panel=%d chip=%d\n",
                                panelp->brdnr, panelp->panelnr, i);
                        continue;
                }
                chipmask |= (0x1 << i);
                outb((PPR + uartaddr), ioaddr);
                outb(PPR_SCALAR, (ioaddr + EREG_DATA));
        }
 
        BRDDISABLE(panelp->brdnr);
        spin_unlock_irqrestore(&brd_lock, flags);
        return chipmask;
}
 
/*****************************************************************************/
 
/*
 *      Initialize hardware specific port registers.
 */
 
static void stl_cd1400portinit(struct stlbrd *brdp, struct stlpanel *panelp, struct stlport *portp)
{
        unsigned long flags;
        pr_debug("stl_cd1400portinit(brdp=%p,panelp=%p,portp=%p)\n", brdp,
                        panelp, portp);
 
        if ((brdp == NULL) || (panelp == NULL) ||
            (portp == NULL))
                return;
 
        spin_lock_irqsave(&brd_lock, flags);
        portp->ioaddr = panelp->iobase + (((brdp->brdtype == BRD_ECHPCI) ||
                (portp->portnr < 8)) ? 0 : EREG_BANKSIZE);
        portp->uartaddr = (portp->portnr & 0x04) << 5;
        portp->pagenr = panelp->pagenr + (portp->portnr >> 3);
 
        BRDENABLE(portp->brdnr, portp->pagenr);
        stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
        stl_cd1400setreg(portp, LIVR, (portp->portnr << 3));
        portp->hwid = stl_cd1400getreg(portp, GFRCR);
        BRDDISABLE(portp->brdnr);
        spin_unlock_irqrestore(&brd_lock, flags);
}
 
/*****************************************************************************/
 
/*
 *      Wait for the command register to be ready. We will poll this,
 *      since it won't usually take too long to be ready.
 */
 
static void stl_cd1400ccrwait(struct stlport *portp)
{
        int     i;
 
        for (i = 0; i < CCR_MAXWAIT; i++)
                if (stl_cd1400getreg(portp, CCR) == 0)
                        return;
 
        printk("STALLION: cd1400 not responding, port=%d panel=%d brd=%d\n",
                portp->portnr, portp->panelnr, portp->brdnr);
}
 
/*****************************************************************************/
 
/*
 *      Set up the cd1400 registers for a port based on the termios port
 *      settings.
 */
 
static void stl_cd1400setport(struct stlport *portp, struct ktermios *tiosp)
{
        struct stlbrd   *brdp;
        unsigned long   flags;
        unsigned int    clkdiv, baudrate;
        unsigned char   cor1, cor2, cor3;
        unsigned char   cor4, cor5, ccr;
        unsigned char   srer, sreron, sreroff;
        unsigned char   mcor1, mcor2, rtpr;
        unsigned char   clk, div;
 
        cor1 = 0;
        cor2 = 0;
        cor3 = 0;
        cor4 = 0;
        cor5 = 0;
        ccr = 0;
        rtpr = 0;
        clk = 0;
        div = 0;
        mcor1 = 0;
        mcor2 = 0;
        sreron = 0;
        sreroff = 0;
 
        brdp = stl_brds[portp->brdnr];
        if (brdp == NULL)
                return;
 
/*
 *      Set up the RX char ignore mask with those RX error types we
 *      can ignore. We can get the cd1400 to help us out a little here,
 *      it will ignore parity errors and breaks for us.
 */
        portp->rxignoremsk = 0;
        if (tiosp->c_iflag & IGNPAR) {
                portp->rxignoremsk |= (ST_PARITY | ST_FRAMING | ST_OVERRUN);
                cor1 |= COR1_PARIGNORE;
        }
        if (tiosp->c_iflag & IGNBRK) {
                portp->rxignoremsk |= ST_BREAK;
                cor4 |= COR4_IGNBRK;
        }
 
        portp->rxmarkmsk = ST_OVERRUN;
        if (tiosp->c_iflag & (INPCK | PARMRK))
                portp->rxmarkmsk |= (ST_PARITY | ST_FRAMING);
        if (tiosp->c_iflag & BRKINT)
                portp->rxmarkmsk |= ST_BREAK;
 
/*
 *      Go through the char size, parity and stop bits and set all the
 *      option register appropriately.
 */
        switch (tiosp->c_cflag & CSIZE) {
        case CS5:
                cor1 |= COR1_CHL5;
                break;
        case CS6:
                cor1 |= COR1_CHL6;
                break;
        case CS7:
                cor1 |= COR1_CHL7;
                break;
        default:
                cor1 |= COR1_CHL8;
                break;
        }
 
        if (tiosp->c_cflag & CSTOPB)
                cor1 |= COR1_STOP2;
        else
                cor1 |= COR1_STOP1;
 
        if (tiosp->c_cflag & PARENB) {
                if (tiosp->c_cflag & PARODD)
                        cor1 |= (COR1_PARENB | COR1_PARODD);
                else
                        cor1 |= (COR1_PARENB | COR1_PAREVEN);
        } else {
                cor1 |= COR1_PARNONE;
        }
 
/*
 *      Set the RX FIFO threshold at 6 chars. This gives a bit of breathing
 *      space for hardware flow control and the like. This should be set to
 *      VMIN. Also here we will set the RX data timeout to 10ms - this should
 *      really be based on VTIME.
 */
        cor3 |= FIFO_RXTHRESHOLD;
        rtpr = 2;
 
/*
 *      Calculate the baud rate timers. For now we will just assume that
 *      the input and output baud are the same. Could have used a baud
 *      table here, but this way we can generate virtually any baud rate
 *      we like!
 */
        baudrate = tiosp->c_cflag & CBAUD;
        if (baudrate & CBAUDEX) {
                baudrate &= ~CBAUDEX;
                if ((baudrate < 1) || (baudrate > 4))
                        tiosp->c_cflag &= ~CBAUDEX;
                else
                        baudrate += 15;
        }
        baudrate = stl_baudrates[baudrate];
        if ((tiosp->c_cflag & CBAUD) == B38400) {
                if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
                        baudrate = 57600;
                else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
                        baudrate = 115200;
                else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
                        baudrate = 230400;
                else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
                        baudrate = 460800;
                else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
                        baudrate = (portp->baud_base / portp->custom_divisor);
        }
        if (baudrate > STL_CD1400MAXBAUD)
                baudrate = STL_CD1400MAXBAUD;
 
        if (baudrate > 0) {
                for (clk = 0; clk < CD1400_NUMCLKS; clk++) {
                        clkdiv = (portp->clk / stl_cd1400clkdivs[clk]) / baudrate;
                        if (clkdiv < 0x100)
                                break;
                }
                div = (unsigned char) clkdiv;
        }
 
/*
 *      Check what form of modem signaling is required and set it up.
 */
        if ((tiosp->c_cflag & CLOCAL) == 0) {
                mcor1 |= MCOR1_DCD;
                mcor2 |= MCOR2_DCD;
                sreron |= SRER_MODEM;
                portp->flags |= ASYNC_CHECK_CD;
        } else
                portp->flags &= ~ASYNC_CHECK_CD;
 
/*
 *      Setup cd1400 enhanced modes if we can. In particular we want to
 *      handle as much of the flow control as possible automatically. As
 *      well as saving a few CPU cycles it will also greatly improve flow
 *      control reliability.
 */
        if (tiosp->c_iflag & IXON) {
                cor2 |= COR2_TXIBE;
                cor3 |= COR3_SCD12;
                if (tiosp->c_iflag & IXANY)
                        cor2 |= COR2_IXM;
        }
 
        if (tiosp->c_cflag & CRTSCTS) {
                cor2 |= COR2_CTSAE;
                mcor1 |= FIFO_RTSTHRESHOLD;
        }
 
/*
 *      All cd1400 register values calculated so go through and set
 *      them all up.
 */
 
        pr_debug("SETPORT: portnr=%d panelnr=%d brdnr=%d\n",
                portp->portnr, portp->panelnr, portp->brdnr);
        pr_debug("    cor1=%x cor2=%x cor3=%x cor4=%x cor5=%x\n",
                cor1, cor2, cor3, cor4, cor5);
        pr_debug("    mcor1=%x mcor2=%x rtpr=%x sreron=%x sreroff=%x\n",
                mcor1, mcor2, rtpr, sreron, sreroff);
        pr_debug("    tcor=%x tbpr=%x rcor=%x rbpr=%x\n", clk, div, clk, div);
        pr_debug("    schr1=%x schr2=%x schr3=%x schr4=%x\n",
                tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP],
                tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP]);
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
        stl_cd1400setreg(portp, CAR, (portp->portnr & 0x3));
        srer = stl_cd1400getreg(portp, SRER);
        stl_cd1400setreg(portp, SRER, 0);
        if (stl_cd1400updatereg(portp, COR1, cor1))
                ccr = 1;
        if (stl_cd1400updatereg(portp, COR2, cor2))
                ccr = 1;
        if (stl_cd1400updatereg(portp, COR3, cor3))
                ccr = 1;
        if (ccr) {
                stl_cd1400ccrwait(portp);
                stl_cd1400setreg(portp, CCR, CCR_CORCHANGE);
        }
        stl_cd1400setreg(portp, COR4, cor4);
        stl_cd1400setreg(portp, COR5, cor5);
        stl_cd1400setreg(portp, MCOR1, mcor1);
        stl_cd1400setreg(portp, MCOR2, mcor2);
        if (baudrate > 0) {
                stl_cd1400setreg(portp, TCOR, clk);
                stl_cd1400setreg(portp, TBPR, div);
                stl_cd1400setreg(portp, RCOR, clk);
                stl_cd1400setreg(portp, RBPR, div);
        }
        stl_cd1400setreg(portp, SCHR1, tiosp->c_cc[VSTART]);
        stl_cd1400setreg(portp, SCHR2, tiosp->c_cc[VSTOP]);
        stl_cd1400setreg(portp, SCHR3, tiosp->c_cc[VSTART]);
        stl_cd1400setreg(portp, SCHR4, tiosp->c_cc[VSTOP]);
        stl_cd1400setreg(portp, RTPR, rtpr);
        mcor1 = stl_cd1400getreg(portp, MSVR1);
        if (mcor1 & MSVR1_DCD)
                portp->sigs |= TIOCM_CD;
        else
                portp->sigs &= ~TIOCM_CD;
        stl_cd1400setreg(portp, SRER, ((srer & ~sreroff) | sreron));
        BRDDISABLE(portp->brdnr);
        spin_unlock_irqrestore(&brd_lock, flags);
}
 
/*****************************************************************************/
 
/*
 *      Set the state of the DTR and RTS signals.
 */
 
static void stl_cd1400setsignals(struct stlport *portp, int dtr, int rts)
{
        unsigned char   msvr1, msvr2;
        unsigned long   flags;
 
        pr_debug("stl_cd1400setsignals(portp=%p,dtr=%d,rts=%d)\n",
                        portp, dtr, rts);
 
        msvr1 = 0;
        msvr2 = 0;
        if (dtr > 0)
                msvr1 = MSVR1_DTR;
        if (rts > 0)
                msvr2 = MSVR2_RTS;
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
        stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
        if (rts >= 0)
                stl_cd1400setreg(portp, MSVR2, msvr2);
        if (dtr >= 0)
                stl_cd1400setreg(portp, MSVR1, msvr1);
        BRDDISABLE(portp->brdnr);
        spin_unlock_irqrestore(&brd_lock, flags);
}
 
/*****************************************************************************/
 
/*
 *      Return the state of the signals.
 */
 
static int stl_cd1400getsignals(struct stlport *portp)
{
        unsigned char   msvr1, msvr2;
        unsigned long   flags;
        int             sigs;
 
        pr_debug("stl_cd1400getsignals(portp=%p)\n", portp);
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
        stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
        msvr1 = stl_cd1400getreg(portp, MSVR1);
        msvr2 = stl_cd1400getreg(portp, MSVR2);
        BRDDISABLE(portp->brdnr);
        spin_unlock_irqrestore(&brd_lock, flags);
 
        sigs = 0;
        sigs |= (msvr1 & MSVR1_DCD) ? TIOCM_CD : 0;
        sigs |= (msvr1 & MSVR1_CTS) ? TIOCM_CTS : 0;
        sigs |= (msvr1 & MSVR1_DTR) ? TIOCM_DTR : 0;
        sigs |= (msvr2 & MSVR2_RTS) ? TIOCM_RTS : 0;
#if 0
        sigs |= (msvr1 & MSVR1_RI) ? TIOCM_RI : 0;
        sigs |= (msvr1 & MSVR1_DSR) ? TIOCM_DSR : 0;
#else
        sigs |= TIOCM_DSR;
#endif
        return sigs;
}
 
/*****************************************************************************/
 
/*
 *      Enable/Disable the Transmitter and/or Receiver.
 */
 
static void stl_cd1400enablerxtx(struct stlport *portp, int rx, int tx)
{
        unsigned char   ccr;
        unsigned long   flags;
 
        pr_debug("stl_cd1400enablerxtx(portp=%p,rx=%d,tx=%d)\n", portp, rx, tx);
 
        ccr = 0;
 
        if (tx == 0)
                ccr |= CCR_TXDISABLE;
        else if (tx > 0)
                ccr |= CCR_TXENABLE;
        if (rx == 0)
                ccr |= CCR_RXDISABLE;
        else if (rx > 0)
                ccr |= CCR_RXENABLE;
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
        stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
        stl_cd1400ccrwait(portp);
        stl_cd1400setreg(portp, CCR, ccr);
        stl_cd1400ccrwait(portp);
        BRDDISABLE(portp->brdnr);
        spin_unlock_irqrestore(&brd_lock, flags);
}
 
/*****************************************************************************/
 
/*
 *      Start/stop the Transmitter and/or Receiver.
 */
 
static void stl_cd1400startrxtx(struct stlport *portp, int rx, int tx)
{
        unsigned char   sreron, sreroff;
        unsigned long   flags;
 
        pr_debug("stl_cd1400startrxtx(portp=%p,rx=%d,tx=%d)\n", portp, rx, tx);
 
        sreron = 0;
        sreroff = 0;
        if (tx == 0)
                sreroff |= (SRER_TXDATA | SRER_TXEMPTY);
        else if (tx == 1)
                sreron |= SRER_TXDATA;
        else if (tx >= 2)
                sreron |= SRER_TXEMPTY;
        if (rx == 0)
                sreroff |= SRER_RXDATA;
        else if (rx > 0)
                sreron |= SRER_RXDATA;
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
        stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
        stl_cd1400setreg(portp, SRER,
                ((stl_cd1400getreg(portp, SRER) & ~sreroff) | sreron));
        BRDDISABLE(portp->brdnr);
        if (tx > 0)
                set_bit(ASYI_TXBUSY, &portp->istate);
        spin_unlock_irqrestore(&brd_lock, flags);
}
 
/*****************************************************************************/
 
/*
 *      Disable all interrupts from this port.
 */
 
static void stl_cd1400disableintrs(struct stlport *portp)
{
        unsigned long   flags;
 
        pr_debug("stl_cd1400disableintrs(portp=%p)\n", portp);
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
        stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
        stl_cd1400setreg(portp, SRER, 0);
        BRDDISABLE(portp->brdnr);
        spin_unlock_irqrestore(&brd_lock, flags);
}
 
/*****************************************************************************/
 
static void stl_cd1400sendbreak(struct stlport *portp, int len)
{
        unsigned long   flags;
 
        pr_debug("stl_cd1400sendbreak(portp=%p,len=%d)\n", portp, len);
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
        stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
        stl_cd1400setreg(portp, SRER,
                ((stl_cd1400getreg(portp, SRER) & ~SRER_TXDATA) |
                SRER_TXEMPTY));
        BRDDISABLE(portp->brdnr);
        portp->brklen = len;
        if (len == 1)
                portp->stats.txbreaks++;
        spin_unlock_irqrestore(&brd_lock, flags);
}
 
/*****************************************************************************/
 
/*
 *      Take flow control actions...
 */
 
static void stl_cd1400flowctrl(struct stlport *portp, int state)
{
        struct tty_struct       *tty;
        unsigned long           flags;
 
        pr_debug("stl_cd1400flowctrl(portp=%p,state=%x)\n", portp, state);
 
        if (portp == NULL)
                return;
        tty = portp->tty;
        if (tty == NULL)
                return;
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
        stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
 
        if (state) {
                if (tty->termios->c_iflag & IXOFF) {
                        stl_cd1400ccrwait(portp);
                        stl_cd1400setreg(portp, CCR, CCR_SENDSCHR1);
                        portp->stats.rxxon++;
                        stl_cd1400ccrwait(portp);
                }
/*
 *              Question: should we return RTS to what it was before? It may
 *              have been set by an ioctl... Suppose not, since if you have
 *              hardware flow control set then it is pretty silly to go and
 *              set the RTS line by hand.
 */
                if (tty->termios->c_cflag & CRTSCTS) {
                        stl_cd1400setreg(portp, MCOR1,
                                (stl_cd1400getreg(portp, MCOR1) |
                                FIFO_RTSTHRESHOLD));
                        stl_cd1400setreg(portp, MSVR2, MSVR2_RTS);
                        portp->stats.rxrtson++;
                }
        } else {
                if (tty->termios->c_iflag & IXOFF) {
                        stl_cd1400ccrwait(portp);
                        stl_cd1400setreg(portp, CCR, CCR_SENDSCHR2);
                        portp->stats.rxxoff++;
                        stl_cd1400ccrwait(portp);
                }
                if (tty->termios->c_cflag & CRTSCTS) {
                        stl_cd1400setreg(portp, MCOR1,
                                (stl_cd1400getreg(portp, MCOR1) & 0xf0));
                        stl_cd1400setreg(portp, MSVR2, 0);
                        portp->stats.rxrtsoff++;
                }
        }
 
        BRDDISABLE(portp->brdnr);
        spin_unlock_irqrestore(&brd_lock, flags);
}
 
/*****************************************************************************/
 
/*
 *      Send a flow control character...
 */
 
static void stl_cd1400sendflow(struct stlport *portp, int state)
{
        struct tty_struct       *tty;
        unsigned long           flags;
 
        pr_debug("stl_cd1400sendflow(portp=%p,state=%x)\n", portp, state);
 
        if (portp == NULL)
                return;
        tty = portp->tty;
        if (tty == NULL)
                return;
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
        stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
        if (state) {
                stl_cd1400ccrwait(portp);
                stl_cd1400setreg(portp, CCR, CCR_SENDSCHR1);
                portp->stats.rxxon++;
                stl_cd1400ccrwait(portp);
        } else {
                stl_cd1400ccrwait(portp);
                stl_cd1400setreg(portp, CCR, CCR_SENDSCHR2);
                portp->stats.rxxoff++;
                stl_cd1400ccrwait(portp);
        }
        BRDDISABLE(portp->brdnr);
        spin_unlock_irqrestore(&brd_lock, flags);
}
 
/*****************************************************************************/
 
static void stl_cd1400flush(struct stlport *portp)
{
        unsigned long   flags;
 
        pr_debug("stl_cd1400flush(portp=%p)\n", portp);
 
        if (portp == NULL)
                return;
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
        stl_cd1400setreg(portp, CAR, (portp->portnr & 0x03));
        stl_cd1400ccrwait(portp);
        stl_cd1400setreg(portp, CCR, CCR_TXFLUSHFIFO);
        stl_cd1400ccrwait(portp);
        portp->tx.tail = portp->tx.head;
        BRDDISABLE(portp->brdnr);
        spin_unlock_irqrestore(&brd_lock, flags);
}
 
/*****************************************************************************/
 
/*
 *      Return the current state of data flow on this port. This is only
 *      really interresting when determining if data has fully completed
 *      transmission or not... This is easy for the cd1400, it accurately
 *      maintains the busy port flag.
 */
 
static int stl_cd1400datastate(struct stlport *portp)
{
        pr_debug("stl_cd1400datastate(portp=%p)\n", portp);
 
        if (portp == NULL)
                return 0;
 
        return test_bit(ASYI_TXBUSY, &portp->istate) ? 1 : 0;
}
 
/*****************************************************************************/
 
/*
 *      Interrupt service routine for cd1400 EasyIO boards.
 */
 
static void stl_cd1400eiointr(struct stlpanel *panelp, unsigned int iobase)
{
        unsigned char   svrtype;
 
        pr_debug("stl_cd1400eiointr(panelp=%p,iobase=%x)\n", panelp, iobase);
 
        spin_lock(&brd_lock);
        outb(SVRR, iobase);
        svrtype = inb(iobase + EREG_DATA);
        if (panelp->nrports > 4) {
                outb((SVRR + 0x80), iobase);
                svrtype |= inb(iobase + EREG_DATA);
        }
 
        if (svrtype & SVRR_RX)
                stl_cd1400rxisr(panelp, iobase);
        else if (svrtype & SVRR_TX)
                stl_cd1400txisr(panelp, iobase);
        else if (svrtype & SVRR_MDM)
                stl_cd1400mdmisr(panelp, iobase);
 
        spin_unlock(&brd_lock);
}
 
/*****************************************************************************/
 
/*
 *      Interrupt service routine for cd1400 panels.
 */
 
static void stl_cd1400echintr(struct stlpanel *panelp, unsigned int iobase)
{
        unsigned char   svrtype;
 
        pr_debug("stl_cd1400echintr(panelp=%p,iobase=%x)\n", panelp, iobase);
 
        outb(SVRR, iobase);
        svrtype = inb(iobase + EREG_DATA);
        outb((SVRR + 0x80), iobase);
        svrtype |= inb(iobase + EREG_DATA);
        if (svrtype & SVRR_RX)
                stl_cd1400rxisr(panelp, iobase);
        else if (svrtype & SVRR_TX)
                stl_cd1400txisr(panelp, iobase);
        else if (svrtype & SVRR_MDM)
                stl_cd1400mdmisr(panelp, iobase);
}
 
 
/*****************************************************************************/
 
/*
 *      Unfortunately we need to handle breaks in the TX data stream, since
 *      this is the only way to generate them on the cd1400.
 */
 
static int stl_cd1400breakisr(struct stlport *portp, int ioaddr)
{
        if (portp->brklen == 1) {
                outb((COR2 + portp->uartaddr), ioaddr);
                outb((inb(ioaddr + EREG_DATA) | COR2_ETC),
                        (ioaddr + EREG_DATA));
                outb((TDR + portp->uartaddr), ioaddr);
                outb(ETC_CMD, (ioaddr + EREG_DATA));
                outb(ETC_STARTBREAK, (ioaddr + EREG_DATA));
                outb((SRER + portp->uartaddr), ioaddr);
                outb((inb(ioaddr + EREG_DATA) & ~(SRER_TXDATA | SRER_TXEMPTY)),
                        (ioaddr + EREG_DATA));
                return 1;
        } else if (portp->brklen > 1) {
                outb((TDR + portp->uartaddr), ioaddr);
                outb(ETC_CMD, (ioaddr + EREG_DATA));
                outb(ETC_STOPBREAK, (ioaddr + EREG_DATA));
                portp->brklen = -1;
                return 1;
        } else {
                outb((COR2 + portp->uartaddr), ioaddr);
                outb((inb(ioaddr + EREG_DATA) & ~COR2_ETC),
                        (ioaddr + EREG_DATA));
                portp->brklen = 0;
        }
        return 0;
}
 
/*****************************************************************************/
 
/*
 *      Transmit interrupt handler. This has gotta be fast!  Handling TX
 *      chars is pretty simple, stuff as many as possible from the TX buffer
 *      into the cd1400 FIFO. Must also handle TX breaks here, since they
 *      are embedded as commands in the data stream. Oh no, had to use a goto!
 *      This could be optimized more, will do when I get time...
 *      In practice it is possible that interrupts are enabled but that the
 *      port has been hung up. Need to handle not having any TX buffer here,
 *      this is done by using the side effect that head and tail will also
 *      be NULL if the buffer has been freed.
 */
 
static void stl_cd1400txisr(struct stlpanel *panelp, int ioaddr)
{
        struct stlport  *portp;
        int             len, stlen;
        char            *head, *tail;
        unsigned char   ioack, srer;
 
        pr_debug("stl_cd1400txisr(panelp=%p,ioaddr=%x)\n", panelp, ioaddr);
 
        ioack = inb(ioaddr + EREG_TXACK);
        if (((ioack & panelp->ackmask) != 0) ||
            ((ioack & ACK_TYPMASK) != ACK_TYPTX)) {
                printk("STALLION: bad TX interrupt ack value=%x\n", ioack);
                return;
        }
        portp = panelp->ports[(ioack >> 3)];
 
/*
 *      Unfortunately we need to handle breaks in the data stream, since
 *      this is the only way to generate them on the cd1400. Do it now if
 *      a break is to be sent.
 */
        if (portp->brklen != 0)
                if (stl_cd1400breakisr(portp, ioaddr))
                        goto stl_txalldone;
 
        head = portp->tx.head;
        tail = portp->tx.tail;
        len = (head >= tail) ? (head - tail) : (STL_TXBUFSIZE - (tail - head));
        if ((len == 0) || ((len < STL_TXBUFLOW) &&
            (test_bit(ASYI_TXLOW, &portp->istate) == 0))) {
                set_bit(ASYI_TXLOW, &portp->istate);
                schedule_work(&portp->tqueue);
        }
 
        if (len == 0) {
                outb((SRER + portp->uartaddr), ioaddr);
                srer = inb(ioaddr + EREG_DATA);
                if (srer & SRER_TXDATA) {
                        srer = (srer & ~SRER_TXDATA) | SRER_TXEMPTY;
                } else {
                        srer &= ~(SRER_TXDATA | SRER_TXEMPTY);
                        clear_bit(ASYI_TXBUSY, &portp->istate);
                }
                outb(srer, (ioaddr + EREG_DATA));
        } else {
                len = min(len, CD1400_TXFIFOSIZE);
                portp->stats.txtotal += len;
                stlen = min(len, ((portp->tx.buf + STL_TXBUFSIZE) - tail));
                outb((TDR + portp->uartaddr), ioaddr);
                outsb((ioaddr + EREG_DATA), tail, stlen);
                len -= stlen;
                tail += stlen;
                if (tail >= (portp->tx.buf + STL_TXBUFSIZE))
                        tail = portp->tx.buf;
                if (len > 0) {
                        outsb((ioaddr + EREG_DATA), tail, len);
                        tail += len;
                }
                portp->tx.tail = tail;
        }
 
stl_txalldone:
        outb((EOSRR + portp->uartaddr), ioaddr);
        outb(0, (ioaddr + EREG_DATA));
}
 
/*****************************************************************************/
 
/*
 *      Receive character interrupt handler. Determine if we have good chars
 *      or bad chars and then process appropriately. Good chars are easy
 *      just shove the lot into the RX buffer and set all status byte to 0.
 *      If a bad RX char then process as required. This routine needs to be
 *      fast!  In practice it is possible that we get an interrupt on a port
 *      that is closed. This can happen on hangups - since they completely
 *      shutdown a port not in user context. Need to handle this case.
 */
 
static void stl_cd1400rxisr(struct stlpanel *panelp, int ioaddr)
{
        struct stlport          *portp;
        struct tty_struct       *tty;
        unsigned int            ioack, len, buflen;
        unsigned char           status;
        char                    ch;
 
        pr_debug("stl_cd1400rxisr(panelp=%p,ioaddr=%x)\n", panelp, ioaddr);
 
        ioack = inb(ioaddr + EREG_RXACK);
        if ((ioack & panelp->ackmask) != 0) {
                printk("STALLION: bad RX interrupt ack value=%x\n", ioack);
                return;
        }
        portp = panelp->ports[(ioack >> 3)];
        tty = portp->tty;
 
        if ((ioack & ACK_TYPMASK) == ACK_TYPRXGOOD) {
                outb((RDCR + portp->uartaddr), ioaddr);
                len = inb(ioaddr + EREG_DATA);
                if (tty == NULL || (buflen = tty_buffer_request_room(tty, len)) == 0) {
                        len = min(len, sizeof(stl_unwanted));
                        outb((RDSR + portp->uartaddr), ioaddr);
                        insb((ioaddr + EREG_DATA), &stl_unwanted[0], len);
                        portp->stats.rxlost += len;
                        portp->stats.rxtotal += len;
                } else {
                        len = min(len, buflen);
                        if (len > 0) {
                                unsigned char *ptr;
                                outb((RDSR + portp->uartaddr), ioaddr);
                                tty_prepare_flip_string(tty, &ptr, len);
                                insb((ioaddr + EREG_DATA), ptr, len);
                                tty_schedule_flip(tty);
                                portp->stats.rxtotal += len;
                        }
                }
        } else if ((ioack & ACK_TYPMASK) == ACK_TYPRXBAD) {
                outb((RDSR + portp->uartaddr), ioaddr);
                status = inb(ioaddr + EREG_DATA);
                ch = inb(ioaddr + EREG_DATA);
                if (status & ST_PARITY)
                        portp->stats.rxparity++;
                if (status & ST_FRAMING)
                        portp->stats.rxframing++;
                if (status & ST_OVERRUN)
                        portp->stats.rxoverrun++;
                if (status & ST_BREAK)
                        portp->stats.rxbreaks++;
                if (status & ST_SCHARMASK) {
                        if ((status & ST_SCHARMASK) == ST_SCHAR1)
                                portp->stats.txxon++;
                        if ((status & ST_SCHARMASK) == ST_SCHAR2)
                                portp->stats.txxoff++;
                        goto stl_rxalldone;
                }
                if (tty != NULL && (portp->rxignoremsk & status) == 0) {
                        if (portp->rxmarkmsk & status) {
                                if (status & ST_BREAK) {
                                        status = TTY_BREAK;
                                        if (portp->flags & ASYNC_SAK) {
                                                do_SAK(tty);
                                                BRDENABLE(portp->brdnr, portp->pagenr);
                                        }
                                } else if (status & ST_PARITY)
                                        status = TTY_PARITY;
                                else if (status & ST_FRAMING)
                                        status = TTY_FRAME;
                                else if(status & ST_OVERRUN)
                                        status = TTY_OVERRUN;
                                else
                                        status = 0;
                        } else
                                status = 0;
                        tty_insert_flip_char(tty, ch, status);
                        tty_schedule_flip(tty);
                }
        } else {
                printk("STALLION: bad RX interrupt ack value=%x\n", ioack);
                return;
        }
 
stl_rxalldone:
        outb((EOSRR + portp->uartaddr), ioaddr);
        outb(0, (ioaddr + EREG_DATA));
}
 
/*****************************************************************************/
 
/*
 *      Modem interrupt handler. The is called when the modem signal line
 *      (DCD) has changed state. Leave most of the work to the off-level
 *      processing routine.
 */
 
static void stl_cd1400mdmisr(struct stlpanel *panelp, int ioaddr)
{
        struct stlport  *portp;
        unsigned int    ioack;
        unsigned char   misr;
 
        pr_debug("stl_cd1400mdmisr(panelp=%p)\n", panelp);
 
        ioack = inb(ioaddr + EREG_MDACK);
        if (((ioack & panelp->ackmask) != 0) ||
            ((ioack & ACK_TYPMASK) != ACK_TYPMDM)) {
                printk("STALLION: bad MODEM interrupt ack value=%x\n", ioack);
                return;
        }
        portp = panelp->ports[(ioack >> 3)];
 
        outb((MISR + portp->uartaddr), ioaddr);
        misr = inb(ioaddr + EREG_DATA);
        if (misr & MISR_DCD) {
                set_bit(ASYI_DCDCHANGE, &portp->istate);
                schedule_work(&portp->tqueue);
                portp->stats.modem++;
        }
 
        outb((EOSRR + portp->uartaddr), ioaddr);
        outb(0, (ioaddr + EREG_DATA));
}
 
/*****************************************************************************/
/*                      SC26198 HARDWARE FUNCTIONS                           */
/*****************************************************************************/
 
/*
 *      These functions get/set/update the registers of the sc26198 UARTs.
 *      Access to the sc26198 registers is via an address/data io port pair.
 *      (Maybe should make this inline...)
 */
 
static int stl_sc26198getreg(struct stlport *portp, int regnr)
{
        outb((regnr | portp->uartaddr), (portp->ioaddr + XP_ADDR));
        return inb(portp->ioaddr + XP_DATA);
}
 
static void stl_sc26198setreg(struct stlport *portp, int regnr, int value)
{
        outb((regnr | portp->uartaddr), (portp->ioaddr + XP_ADDR));
        outb(value, (portp->ioaddr + XP_DATA));
}
 
static int stl_sc26198updatereg(struct stlport *portp, int regnr, int value)
{
        outb((regnr | portp->uartaddr), (portp->ioaddr + XP_ADDR));
        if (inb(portp->ioaddr + XP_DATA) != value) {
                outb(value, (portp->ioaddr + XP_DATA));
                return 1;
        }
        return 0;
}
 
/*****************************************************************************/
 
/*
 *      Functions to get and set the sc26198 global registers.
 */
 
static int stl_sc26198getglobreg(struct stlport *portp, int regnr)
{
        outb(regnr, (portp->ioaddr + XP_ADDR));
        return inb(portp->ioaddr + XP_DATA);
}
 
#if 0
static void stl_sc26198setglobreg(struct stlport *portp, int regnr, int value)
{
        outb(regnr, (portp->ioaddr + XP_ADDR));
        outb(value, (portp->ioaddr + XP_DATA));
}
#endif
 
/*****************************************************************************/
 
/*
 *      Inbitialize the UARTs in a panel. We don't care what sort of board
 *      these ports are on - since the port io registers are almost
 *      identical when dealing with ports.
 */
 
static int stl_sc26198panelinit(struct stlbrd *brdp, struct stlpanel *panelp)
{
        int     chipmask, i;
        int     nrchips, ioaddr;
 
        pr_debug("stl_sc26198panelinit(brdp=%p,panelp=%p)\n", brdp, panelp);
 
        BRDENABLE(panelp->brdnr, panelp->pagenr);
 
/*
 *      Check that each chip is present and started up OK.
 */
        chipmask = 0;
        nrchips = (panelp->nrports + 4) / SC26198_PORTS;
        if (brdp->brdtype == BRD_ECHPCI)
                outb(panelp->pagenr, brdp->ioctrl);
 
        for (i = 0; i < nrchips; i++) {
                ioaddr = panelp->iobase + (i * 4);
                outb(SCCR, (ioaddr + XP_ADDR));
                outb(CR_RESETALL, (ioaddr + XP_DATA));
                outb(TSTR, (ioaddr + XP_ADDR));
                if (inb(ioaddr + XP_DATA) != 0) {
                        printk("STALLION: sc26198 not responding, "
                                "brd=%d panel=%d chip=%d\n",
                                panelp->brdnr, panelp->panelnr, i);
                        continue;
                }
                chipmask |= (0x1 << i);
                outb(GCCR, (ioaddr + XP_ADDR));
                outb(GCCR_IVRTYPCHANACK, (ioaddr + XP_DATA));
                outb(WDTRCR, (ioaddr + XP_ADDR));
                outb(0xff, (ioaddr + XP_DATA));
        }
 
        BRDDISABLE(panelp->brdnr);
        return chipmask;
}
 
/*****************************************************************************/
 
/*
 *      Initialize hardware specific port registers.
 */
 
static void stl_sc26198portinit(struct stlbrd *brdp, struct stlpanel *panelp, struct stlport *portp)
{
        pr_debug("stl_sc26198portinit(brdp=%p,panelp=%p,portp=%p)\n", brdp,
                        panelp, portp);
 
        if ((brdp == NULL) || (panelp == NULL) ||
            (portp == NULL))
                return;
 
        portp->ioaddr = panelp->iobase + ((portp->portnr < 8) ? 0 : 4);
        portp->uartaddr = (portp->portnr & 0x07) << 4;
        portp->pagenr = panelp->pagenr;
        portp->hwid = 0x1;
 
        BRDENABLE(portp->brdnr, portp->pagenr);
        stl_sc26198setreg(portp, IOPCR, IOPCR_SETSIGS);
        BRDDISABLE(portp->brdnr);
}
 
/*****************************************************************************/
 
/*
 *      Set up the sc26198 registers for a port based on the termios port
 *      settings.
 */
 
static void stl_sc26198setport(struct stlport *portp, struct ktermios *tiosp)
{
        struct stlbrd   *brdp;
        unsigned long   flags;
        unsigned int    baudrate;
        unsigned char   mr0, mr1, mr2, clk;
        unsigned char   imron, imroff, iopr, ipr;
 
        mr0 = 0;
        mr1 = 0;
        mr2 = 0;
        clk = 0;
        iopr = 0;
        imron = 0;
        imroff = 0;
 
        brdp = stl_brds[portp->brdnr];
        if (brdp == NULL)
                return;
 
/*
 *      Set up the RX char ignore mask with those RX error types we
 *      can ignore.
 */
        portp->rxignoremsk = 0;
        if (tiosp->c_iflag & IGNPAR)
                portp->rxignoremsk |= (SR_RXPARITY | SR_RXFRAMING |
                        SR_RXOVERRUN);
        if (tiosp->c_iflag & IGNBRK)
                portp->rxignoremsk |= SR_RXBREAK;
 
        portp->rxmarkmsk = SR_RXOVERRUN;
        if (tiosp->c_iflag & (INPCK | PARMRK))
                portp->rxmarkmsk |= (SR_RXPARITY | SR_RXFRAMING);
        if (tiosp->c_iflag & BRKINT)
                portp->rxmarkmsk |= SR_RXBREAK;
 
/*
 *      Go through the char size, parity and stop bits and set all the
 *      option register appropriately.
 */
        switch (tiosp->c_cflag & CSIZE) {
        case CS5:
                mr1 |= MR1_CS5;
                break;
        case CS6:
                mr1 |= MR1_CS6;
                break;
        case CS7:
                mr1 |= MR1_CS7;
                break;
        default:
                mr1 |= MR1_CS8;
                break;
        }
 
        if (tiosp->c_cflag & CSTOPB)
                mr2 |= MR2_STOP2;
        else
                mr2 |= MR2_STOP1;
 
        if (tiosp->c_cflag & PARENB) {
                if (tiosp->c_cflag & PARODD)
                        mr1 |= (MR1_PARENB | MR1_PARODD);
                else
                        mr1 |= (MR1_PARENB | MR1_PAREVEN);
        } else
                mr1 |= MR1_PARNONE;
 
        mr1 |= MR1_ERRBLOCK;
 
/*
 *      Set the RX FIFO threshold at 8 chars. This gives a bit of breathing
 *      space for hardware flow control and the like. This should be set to
 *      VMIN.
 */
        mr2 |= MR2_RXFIFOHALF;
 
/*
 *      Calculate the baud rate timers. For now we will just assume that
 *      the input and output baud are the same. The sc26198 has a fixed
 *      baud rate table, so only discrete baud rates possible.
 */
        baudrate = tiosp->c_cflag & CBAUD;
        if (baudrate & CBAUDEX) {
                baudrate &= ~CBAUDEX;
                if ((baudrate < 1) || (baudrate > 4))
                        tiosp->c_cflag &= ~CBAUDEX;
                else
                        baudrate += 15;
        }
        baudrate = stl_baudrates[baudrate];
        if ((tiosp->c_cflag & CBAUD) == B38400) {
                if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
                        baudrate = 57600;
                else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
                        baudrate = 115200;
                else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
                        baudrate = 230400;
                else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
                        baudrate = 460800;
                else if ((portp->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
                        baudrate = (portp->baud_base / portp->custom_divisor);
        }
        if (baudrate > STL_SC26198MAXBAUD)
                baudrate = STL_SC26198MAXBAUD;
 
        if (baudrate > 0)
                for (clk = 0; clk < SC26198_NRBAUDS; clk++)
                        if (baudrate <= sc26198_baudtable[clk])
                                break;
 
/*
 *      Check what form of modem signaling is required and set it up.
 */
        if (tiosp->c_cflag & CLOCAL) {
                portp->flags &= ~ASYNC_CHECK_CD;
        } else {
                iopr |= IOPR_DCDCOS;
                imron |= IR_IOPORT;
                portp->flags |= ASYNC_CHECK_CD;
        }
 
/*
 *      Setup sc26198 enhanced modes if we can. In particular we want to
 *      handle as much of the flow control as possible automatically. As
 *      well as saving a few CPU cycles it will also greatly improve flow
 *      control reliability.
 */
        if (tiosp->c_iflag & IXON) {
                mr0 |= MR0_SWFTX | MR0_SWFT;
                imron |= IR_XONXOFF;
        } else
                imroff |= IR_XONXOFF;
 
        if (tiosp->c_iflag & IXOFF)
                mr0 |= MR0_SWFRX;
 
        if (tiosp->c_cflag & CRTSCTS) {
                mr2 |= MR2_AUTOCTS;
                mr1 |= MR1_AUTORTS;
        }
 
/*
 *      All sc26198 register values calculated so go through and set
 *      them all up.
 */
 
        pr_debug("SETPORT: portnr=%d panelnr=%d brdnr=%d\n",
                portp->portnr, portp->panelnr, portp->brdnr);
        pr_debug("    mr0=%x mr1=%x mr2=%x clk=%x\n", mr0, mr1, mr2, clk);
        pr_debug("    iopr=%x imron=%x imroff=%x\n", iopr, imron, imroff);
        pr_debug("    schr1=%x schr2=%x schr3=%x schr4=%x\n",
                tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP],
                tiosp->c_cc[VSTART], tiosp->c_cc[VSTOP]);
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
        stl_sc26198setreg(portp, IMR, 0);
        stl_sc26198updatereg(portp, MR0, mr0);
        stl_sc26198updatereg(portp, MR1, mr1);
        stl_sc26198setreg(portp, SCCR, CR_RXERRBLOCK);
        stl_sc26198updatereg(portp, MR2, mr2);
        stl_sc26198updatereg(portp, IOPIOR,
                ((stl_sc26198getreg(portp, IOPIOR) & ~IPR_CHANGEMASK) | iopr));
 
        if (baudrate > 0) {
                stl_sc26198setreg(portp, TXCSR, clk);
                stl_sc26198setreg(portp, RXCSR, clk);
        }
 
        stl_sc26198setreg(portp, XONCR, tiosp->c_cc[VSTART]);
        stl_sc26198setreg(portp, XOFFCR, tiosp->c_cc[VSTOP]);
 
        ipr = stl_sc26198getreg(portp, IPR);
        if (ipr & IPR_DCD)
                portp->sigs &= ~TIOCM_CD;
        else
                portp->sigs |= TIOCM_CD;
 
        portp->imr = (portp->imr & ~imroff) | imron;
        stl_sc26198setreg(portp, IMR, portp->imr);
        BRDDISABLE(portp->brdnr);
        spin_unlock_irqrestore(&brd_lock, flags);
}
 
/*****************************************************************************/
 
/*
 *      Set the state of the DTR and RTS signals.
 */
 
static void stl_sc26198setsignals(struct stlport *portp, int dtr, int rts)
{
        unsigned char   iopioron, iopioroff;
        unsigned long   flags;
 
        pr_debug("stl_sc26198setsignals(portp=%p,dtr=%d,rts=%d)\n", portp,
                        dtr, rts);
 
        iopioron = 0;
        iopioroff = 0;
        if (dtr == 0)
                iopioroff |= IPR_DTR;
        else if (dtr > 0)
                iopioron |= IPR_DTR;
        if (rts == 0)
                iopioroff |= IPR_RTS;
        else if (rts > 0)
                iopioron |= IPR_RTS;
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
        stl_sc26198setreg(portp, IOPIOR,
                ((stl_sc26198getreg(portp, IOPIOR) & ~iopioroff) | iopioron));
        BRDDISABLE(portp->brdnr);
        spin_unlock_irqrestore(&brd_lock, flags);
}
 
/*****************************************************************************/
 
/*
 *      Return the state of the signals.
 */
 
static int stl_sc26198getsignals(struct stlport *portp)
{
        unsigned char   ipr;
        unsigned long   flags;
        int             sigs;
 
        pr_debug("stl_sc26198getsignals(portp=%p)\n", portp);
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
        ipr = stl_sc26198getreg(portp, IPR);
        BRDDISABLE(portp->brdnr);
        spin_unlock_irqrestore(&brd_lock, flags);
 
        sigs = 0;
        sigs |= (ipr & IPR_DCD) ? 0 : TIOCM_CD;
        sigs |= (ipr & IPR_CTS) ? 0 : TIOCM_CTS;
        sigs |= (ipr & IPR_DTR) ? 0: TIOCM_DTR;
        sigs |= (ipr & IPR_RTS) ? 0: TIOCM_RTS;
        sigs |= TIOCM_DSR;
        return sigs;
}
 
/*****************************************************************************/
 
/*
 *      Enable/Disable the Transmitter and/or Receiver.
 */
 
static void stl_sc26198enablerxtx(struct stlport *portp, int rx, int tx)
{
        unsigned char   ccr;
        unsigned long   flags;
 
        pr_debug("stl_sc26198enablerxtx(portp=%p,rx=%d,tx=%d)\n", portp, rx,tx);
 
        ccr = portp->crenable;
        if (tx == 0)
                ccr &= ~CR_TXENABLE;
        else if (tx > 0)
                ccr |= CR_TXENABLE;
        if (rx == 0)
                ccr &= ~CR_RXENABLE;
        else if (rx > 0)
                ccr |= CR_RXENABLE;
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
        stl_sc26198setreg(portp, SCCR, ccr);
        BRDDISABLE(portp->brdnr);
        portp->crenable = ccr;
        spin_unlock_irqrestore(&brd_lock, flags);
}
 
/*****************************************************************************/
 
/*
 *      Start/stop the Transmitter and/or Receiver.
 */
 
static void stl_sc26198startrxtx(struct stlport *portp, int rx, int tx)
{
        unsigned char   imr;
        unsigned long   flags;
 
        pr_debug("stl_sc26198startrxtx(portp=%p,rx=%d,tx=%d)\n", portp, rx, tx);
 
        imr = portp->imr;
        if (tx == 0)
                imr &= ~IR_TXRDY;
        else if (tx == 1)
                imr |= IR_TXRDY;
        if (rx == 0)
                imr &= ~(IR_RXRDY | IR_RXBREAK | IR_RXWATCHDOG);
        else if (rx > 0)
                imr |= IR_RXRDY | IR_RXBREAK | IR_RXWATCHDOG;
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
        stl_sc26198setreg(portp, IMR, imr);
        BRDDISABLE(portp->brdnr);
        portp->imr = imr;
        if (tx > 0)
                set_bit(ASYI_TXBUSY, &portp->istate);
        spin_unlock_irqrestore(&brd_lock, flags);
}
 
/*****************************************************************************/
 
/*
 *      Disable all interrupts from this port.
 */
 
static void stl_sc26198disableintrs(struct stlport *portp)
{
        unsigned long   flags;
 
        pr_debug("stl_sc26198disableintrs(portp=%p)\n", portp);
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
        portp->imr = 0;
        stl_sc26198setreg(portp, IMR, 0);
        BRDDISABLE(portp->brdnr);
        spin_unlock_irqrestore(&brd_lock, flags);
}
 
/*****************************************************************************/
 
static void stl_sc26198sendbreak(struct stlport *portp, int len)
{
        unsigned long   flags;
 
        pr_debug("stl_sc26198sendbreak(portp=%p,len=%d)\n", portp, len);
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
        if (len == 1) {
                stl_sc26198setreg(portp, SCCR, CR_TXSTARTBREAK);
                portp->stats.txbreaks++;
        } else
                stl_sc26198setreg(portp, SCCR, CR_TXSTOPBREAK);
 
        BRDDISABLE(portp->brdnr);
        spin_unlock_irqrestore(&brd_lock, flags);
}
 
/*****************************************************************************/
 
/*
 *      Take flow control actions...
 */
 
static void stl_sc26198flowctrl(struct stlport *portp, int state)
{
        struct tty_struct       *tty;
        unsigned long           flags;
        unsigned char           mr0;
 
        pr_debug("stl_sc26198flowctrl(portp=%p,state=%x)\n", portp, state);
 
        if (portp == NULL)
                return;
        tty = portp->tty;
        if (tty == NULL)
                return;
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
 
        if (state) {
                if (tty->termios->c_iflag & IXOFF) {
                        mr0 = stl_sc26198getreg(portp, MR0);
                        stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
                        stl_sc26198setreg(portp, SCCR, CR_TXSENDXON);
                        mr0 |= MR0_SWFRX;
                        portp->stats.rxxon++;
                        stl_sc26198wait(portp);
                        stl_sc26198setreg(portp, MR0, mr0);
                }
/*
 *              Question: should we return RTS to what it was before? It may
 *              have been set by an ioctl... Suppose not, since if you have
 *              hardware flow control set then it is pretty silly to go and
 *              set the RTS line by hand.
 */
                if (tty->termios->c_cflag & CRTSCTS) {
                        stl_sc26198setreg(portp, MR1,
                                (stl_sc26198getreg(portp, MR1) | MR1_AUTORTS));
                        stl_sc26198setreg(portp, IOPIOR,
                                (stl_sc26198getreg(portp, IOPIOR) | IOPR_RTS));
                        portp->stats.rxrtson++;
                }
        } else {
                if (tty->termios->c_iflag & IXOFF) {
                        mr0 = stl_sc26198getreg(portp, MR0);
                        stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
                        stl_sc26198setreg(portp, SCCR, CR_TXSENDXOFF);
                        mr0 &= ~MR0_SWFRX;
                        portp->stats.rxxoff++;
                        stl_sc26198wait(portp);
                        stl_sc26198setreg(portp, MR0, mr0);
                }
                if (tty->termios->c_cflag & CRTSCTS) {
                        stl_sc26198setreg(portp, MR1,
                                (stl_sc26198getreg(portp, MR1) & ~MR1_AUTORTS));
                        stl_sc26198setreg(portp, IOPIOR,
                                (stl_sc26198getreg(portp, IOPIOR) & ~IOPR_RTS));
                        portp->stats.rxrtsoff++;
                }
        }
 
        BRDDISABLE(portp->brdnr);
        spin_unlock_irqrestore(&brd_lock, flags);
}
 
/*****************************************************************************/
 
/*
 *      Send a flow control character.
 */
 
static void stl_sc26198sendflow(struct stlport *portp, int state)
{
        struct tty_struct       *tty;
        unsigned long           flags;
        unsigned char           mr0;
 
        pr_debug("stl_sc26198sendflow(portp=%p,state=%x)\n", portp, state);
 
        if (portp == NULL)
                return;
        tty = portp->tty;
        if (tty == NULL)
                return;
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
        if (state) {
                mr0 = stl_sc26198getreg(portp, MR0);
                stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
                stl_sc26198setreg(portp, SCCR, CR_TXSENDXON);
                mr0 |= MR0_SWFRX;
                portp->stats.rxxon++;
                stl_sc26198wait(portp);
                stl_sc26198setreg(portp, MR0, mr0);
        } else {
                mr0 = stl_sc26198getreg(portp, MR0);
                stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
                stl_sc26198setreg(portp, SCCR, CR_TXSENDXOFF);
                mr0 &= ~MR0_SWFRX;
                portp->stats.rxxoff++;
                stl_sc26198wait(portp);
                stl_sc26198setreg(portp, MR0, mr0);
        }
        BRDDISABLE(portp->brdnr);
        spin_unlock_irqrestore(&brd_lock, flags);
}
 
/*****************************************************************************/
 
static void stl_sc26198flush(struct stlport *portp)
{
        unsigned long   flags;
 
        pr_debug("stl_sc26198flush(portp=%p)\n", portp);
 
        if (portp == NULL)
                return;
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
        stl_sc26198setreg(portp, SCCR, CR_TXRESET);
        stl_sc26198setreg(portp, SCCR, portp->crenable);
        BRDDISABLE(portp->brdnr);
        portp->tx.tail = portp->tx.head;
        spin_unlock_irqrestore(&brd_lock, flags);
}
 
/*****************************************************************************/
 
/*
 *      Return the current state of data flow on this port. This is only
 *      really interresting when determining if data has fully completed
 *      transmission or not... The sc26198 interrupt scheme cannot
 *      determine when all data has actually drained, so we need to
 *      check the port statusy register to be sure.
 */
 
static int stl_sc26198datastate(struct stlport *portp)
{
        unsigned long   flags;
        unsigned char   sr;
 
        pr_debug("stl_sc26198datastate(portp=%p)\n", portp);
 
        if (portp == NULL)
                return 0;
        if (test_bit(ASYI_TXBUSY, &portp->istate))
                return 1;
 
        spin_lock_irqsave(&brd_lock, flags);
        BRDENABLE(portp->brdnr, portp->pagenr);
        sr = stl_sc26198getreg(portp, SR);
        BRDDISABLE(portp->brdnr);
        spin_unlock_irqrestore(&brd_lock, flags);
 
        return (sr & SR_TXEMPTY) ? 0 : 1;
}
 
/*****************************************************************************/
 
/*
 *      Delay for a small amount of time, to give the sc26198 a chance
 *      to process a command...
 */
 
static void stl_sc26198wait(struct stlport *portp)
{
        int     i;
 
        pr_debug("stl_sc26198wait(portp=%p)\n", portp);
 
        if (portp == NULL)
                return;
 
        for (i = 0; i < 20; i++)
                stl_sc26198getglobreg(portp, TSTR);
}
 
/*****************************************************************************/
 
/*
 *      If we are TX flow controlled and in IXANY mode then we may
 *      need to unflow control here. We gotta do this because of the
 *      automatic flow control modes of the sc26198.
 */
 
static void stl_sc26198txunflow(struct stlport *portp, struct tty_struct *tty)
{
        unsigned char   mr0;
 
        mr0 = stl_sc26198getreg(portp, MR0);
        stl_sc26198setreg(portp, MR0, (mr0 & ~MR0_SWFRXTX));
        stl_sc26198setreg(portp, SCCR, CR_HOSTXON);
        stl_sc26198wait(portp);
        stl_sc26198setreg(portp, MR0, mr0);
        clear_bit(ASYI_TXFLOWED, &portp->istate);
}
 
/*****************************************************************************/
 
/*
 *      Interrupt service routine for sc26198 panels.
 */
 
static void stl_sc26198intr(struct stlpanel *panelp, unsigned int iobase)
{
        struct stlport  *portp;
        unsigned int    iack;
 
        spin_lock(&brd_lock);
 
/*
 *      Work around bug in sc26198 chip... Cannot have A6 address
 *      line of UART high, else iack will be returned as 0.
 */
        outb(0, (iobase + 1));
 
        iack = inb(iobase + XP_IACK);
        portp = panelp->ports[(iack & IVR_CHANMASK) + ((iobase & 0x4) << 1)];
 
        if (iack & IVR_RXDATA)
                stl_sc26198rxisr(portp, iack);
        else if (iack & IVR_TXDATA)
                stl_sc26198txisr(portp);
        else
                stl_sc26198otherisr(portp, iack);
 
        spin_unlock(&brd_lock);
}
 
/*****************************************************************************/
 
/*
 *      Transmit interrupt handler. This has gotta be fast!  Handling TX
 *      chars is pretty simple, stuff as many as possible from the TX buffer
 *      into the sc26198 FIFO.
 *      In practice it is possible that interrupts are enabled but that the
 *      port has been hung up. Need to handle not having any TX buffer here,
 *      this is done by using the side effect that head and tail will also
 *      be NULL if the buffer has been freed.
 */
 
static void stl_sc26198txisr(struct stlport *portp)
{
        unsigned int    ioaddr;
        unsigned char   mr0;
        int             len, stlen;
        char            *head, *tail;
 
        pr_debug("stl_sc26198txisr(portp=%p)\n", portp);
 
        ioaddr = portp->ioaddr;
        head = portp->tx.head;
        tail = portp->tx.tail;
        len = (head >= tail) ? (head - tail) : (STL_TXBUFSIZE - (tail - head));
        if ((len == 0) || ((len < STL_TXBUFLOW) &&
            (test_bit(ASYI_TXLOW, &portp->istate) == 0))) {
                set_bit(ASYI_TXLOW, &portp->istate);
                schedule_work(&portp->tqueue);
        }
 
        if (len == 0) {
                outb((MR0 | portp->uartaddr), (ioaddr + XP_ADDR));
                mr0 = inb(ioaddr + XP_DATA);
                if ((mr0 & MR0_TXMASK) == MR0_TXEMPTY) {
                        portp->imr &= ~IR_TXRDY;
                        outb((IMR | portp->uartaddr), (ioaddr + XP_ADDR));
                        outb(portp->imr, (ioaddr + XP_DATA));
                        clear_bit(ASYI_TXBUSY, &portp->istate);
                } else {
                        mr0 |= ((mr0 & ~MR0_TXMASK) | MR0_TXEMPTY);
                        outb(mr0, (ioaddr + XP_DATA));
                }
        } else {
                len = min(len, SC26198_TXFIFOSIZE);
                portp->stats.txtotal += len;
                stlen = min(len, ((portp->tx.buf + STL_TXBUFSIZE) - tail));
                outb(GTXFIFO, (ioaddr + XP_ADDR));
                outsb((ioaddr + XP_DATA), tail, stlen);
                len -= stlen;
                tail += stlen;
                if (tail >= (portp->tx.buf + STL_TXBUFSIZE))
                        tail = portp->tx.buf;
                if (len > 0) {
                        outsb((ioaddr + XP_DATA), tail, len);
                        tail += len;
                }
                portp->tx.tail = tail;
        }
}
 
/*****************************************************************************/
 
/*
 *      Receive character interrupt handler. Determine if we have good chars
 *      or bad chars and then process appropriately. Good chars are easy
 *      just shove the lot into the RX buffer and set all status byte to 0.
 *      If a bad RX char then process as required. This routine needs to be
 *      fast!  In practice it is possible that we get an interrupt on a port
 *      that is closed. This can happen on hangups - since they completely
 *      shutdown a port not in user context. Need to handle this case.
 */
 
static void stl_sc26198rxisr(struct stlport *portp, unsigned int iack)
{
        struct tty_struct       *tty;
        unsigned int            len, buflen, ioaddr;
 
        pr_debug("stl_sc26198rxisr(portp=%p,iack=%x)\n", portp, iack);
 
        tty = portp->tty;
        ioaddr = portp->ioaddr;
        outb(GIBCR, (ioaddr + XP_ADDR));
        len = inb(ioaddr + XP_DATA) + 1;
 
        if ((iack & IVR_TYPEMASK) == IVR_RXDATA) {
                if (tty == NULL || (buflen = tty_buffer_request_room(tty, len)) == 0) {
                        len = min(len, sizeof(stl_unwanted));
                        outb(GRXFIFO, (ioaddr + XP_ADDR));
                        insb((ioaddr + XP_DATA), &stl_unwanted[0], len);
                        portp->stats.rxlost += len;
                        portp->stats.rxtotal += len;
                } else {
                        len = min(len, buflen);
                        if (len > 0) {
                                unsigned char *ptr;
                                outb(GRXFIFO, (ioaddr + XP_ADDR));
                                tty_prepare_flip_string(tty, &ptr, len);
                                insb((ioaddr + XP_DATA), ptr, len);
                                tty_schedule_flip(tty);
                                portp->stats.rxtotal += len;
                        }
                }
        } else {
                stl_sc26198rxbadchars(portp);
        }
 
/*
 *      If we are TX flow controlled and in IXANY mode then we may need
 *      to unflow control here. We gotta do this because of the automatic
 *      flow control modes of the sc26198.
 */
        if (test_bit(ASYI_TXFLOWED, &portp->istate)) {
                if ((tty != NULL) &&
                    (tty->termios != NULL) &&
                    (tty->termios->c_iflag & IXANY)) {
                        stl_sc26198txunflow(portp, tty);
                }
        }
}
 
/*****************************************************************************/
 
/*
 *      Process an RX bad character.
 */
 
static void stl_sc26198rxbadch(struct stlport *portp, unsigned char status, char ch)
{
        struct tty_struct       *tty;
        unsigned int            ioaddr;
 
        tty = portp->tty;
        ioaddr = portp->ioaddr;
 
        if (status & SR_RXPARITY)
                portp->stats.rxparity++;
        if (status & SR_RXFRAMING)
                portp->stats.rxframing++;
        if (status & SR_RXOVERRUN)
                portp->stats.rxoverrun++;
        if (status & SR_RXBREAK)
                portp->stats.rxbreaks++;
 
        if ((tty != NULL) &&
            ((portp->rxignoremsk & status) == 0)) {
                if (portp->rxmarkmsk & status) {
                        if (status & SR_RXBREAK) {
                                status = TTY_BREAK;
                                if (portp->flags & ASYNC_SAK) {
                                        do_SAK(tty);
                                        BRDENABLE(portp->brdnr, portp->pagenr);
                                }
                        } else if (status & SR_RXPARITY)
                                status = TTY_PARITY;
                        else if (status & SR_RXFRAMING)
                                status = TTY_FRAME;
                        else if(status & SR_RXOVERRUN)
                                status = TTY_OVERRUN;
                        else
                                status = 0;
                } else
                        status = 0;
 
                tty_insert_flip_char(tty, ch, status);
                tty_schedule_flip(tty);
 
                if (status == 0)
                        portp->stats.rxtotal++;
        }
}
 
/*****************************************************************************/
 
/*
 *      Process all characters in the RX FIFO of the UART. Check all char
 *      status bytes as well, and process as required. We need to check
 *      all bytes in the FIFO, in case some more enter the FIFO while we
 *      are here. To get the exact character error type we need to switch
 *      into CHAR error mode (that is why we need to make sure we empty
 *      the FIFO).
 */
 
static void stl_sc26198rxbadchars(struct stlport *portp)
{
        unsigned char   status, mr1;
        char            ch;
 
/*
 *      To get the precise error type for each character we must switch
 *      back into CHAR error mode.
 */
        mr1 = stl_sc26198getreg(portp, MR1);
        stl_sc26198setreg(portp, MR1, (mr1 & ~MR1_ERRBLOCK));
 
        while ((status = stl_sc26198getreg(portp, SR)) & SR_RXRDY) {
                stl_sc26198setreg(portp, SCCR, CR_CLEARRXERR);
                ch = stl_sc26198getreg(portp, RXFIFO);
                stl_sc26198rxbadch(portp, status, ch);
        }
 
/*
 *      To get correct interrupt class we must switch back into BLOCK
 *      error mode.
 */
        stl_sc26198setreg(portp, MR1, mr1);
}
 
/*****************************************************************************/
 
/*
 *      Other interrupt handler. This includes modem signals, flow
 *      control actions, etc. Most stuff is left to off-level interrupt
 *      processing time.
 */
 
static void stl_sc26198otherisr(struct stlport *portp, unsigned int iack)
{
        unsigned char   cir, ipr, xisr;
 
        pr_debug("stl_sc26198otherisr(portp=%p,iack=%x)\n", portp, iack);
 
        cir = stl_sc26198getglobreg(portp, CIR);
 
        switch (cir & CIR_SUBTYPEMASK) {
        case CIR_SUBCOS:
                ipr = stl_sc26198getreg(portp, IPR);
                if (ipr & IPR_DCDCHANGE) {
                        set_bit(ASYI_DCDCHANGE, &portp->istate);
                        schedule_work(&portp->tqueue);
                        portp->stats.modem++;
                }
                break;
        case CIR_SUBXONXOFF:
                xisr = stl_sc26198getreg(portp, XISR);
                if (xisr & XISR_RXXONGOT) {
                        set_bit(ASYI_TXFLOWED, &portp->istate);
                        portp->stats.txxoff++;
                }
                if (xisr & XISR_RXXOFFGOT) {
                        clear_bit(ASYI_TXFLOWED, &portp->istate);
                        portp->stats.txxon++;
                }
                break;
        case CIR_SUBBREAK:
                stl_sc26198setreg(portp, SCCR, CR_BREAKRESET);
                stl_sc26198rxbadchars(portp);
                break;
        default:
                break;
        }
}
 
static void stl_free_isabrds(void)
{
        struct stlbrd *brdp;
        unsigned int i;
 
        for (i = 0; i < stl_nrbrds; i++) {
                if ((brdp = stl_brds[i]) == NULL || (brdp->state & STL_PROBED))
                        continue;
 
                free_irq(brdp->irq, brdp);
 
                stl_cleanup_panels(brdp);
 
                release_region(brdp->ioaddr1, brdp->iosize1);
                if (brdp->iosize2 > 0)
                        release_region(brdp->ioaddr2, brdp->iosize2);
 
                kfree(brdp);
                stl_brds[i] = NULL;
        }
}
 
/*
 *      Loadable module initialization stuff.
 */
static int __init stallion_module_init(void)
{
        struct stlbrd   *brdp;
        struct stlconf  conf;
        unsigned int i, j;
        int retval;
 
        printk(KERN_INFO "%s: version %s\n", stl_drvtitle, stl_drvversion);
 
        spin_lock_init(&stallion_lock);
        spin_lock_init(&brd_lock);
 
        stl_serial = alloc_tty_driver(STL_MAXBRDS * STL_MAXPORTS);
        if (!stl_serial) {
                retval = -ENOMEM;
                goto err;
        }
 
        stl_serial->owner = THIS_MODULE;
        stl_serial->driver_name = stl_drvname;
        stl_serial->name = "ttyE";
        stl_serial->major = STL_SERIALMAJOR;
        stl_serial->minor_start = 0;
        stl_serial->type = TTY_DRIVER_TYPE_SERIAL;
        stl_serial->subtype = SERIAL_TYPE_NORMAL;
        stl_serial->init_termios = stl_deftermios;
        stl_serial->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
        tty_set_operations(stl_serial, &stl_ops);
 
        retval = tty_register_driver(stl_serial);
        if (retval) {
                printk("STALLION: failed to register serial driver\n");
                goto err_frtty;
        }
 
/*
 *      Find any dynamically supported boards. That is via module load
 *      line options.
 */
        for (i = stl_nrbrds; i < stl_nargs; i++) {
                memset(&conf, 0, sizeof(conf));
                if (stl_parsebrd(&conf, stl_brdsp[i]) == 0)
                        continue;
                if ((brdp = stl_allocbrd()) == NULL)
                        continue;
                brdp->brdnr = i;
                brdp->brdtype = conf.brdtype;
                brdp->ioaddr1 = conf.ioaddr1;
                brdp->ioaddr2 = conf.ioaddr2;
                brdp->irq = conf.irq;
                brdp->irqtype = conf.irqtype;
                stl_brds[brdp->brdnr] = brdp;
                if (stl_brdinit(brdp)) {
                        stl_brds[brdp->brdnr] = NULL;
                        kfree(brdp);
                } else {
                        for (j = 0; j < brdp->nrports; j++)
                                tty_register_device(stl_serial,
                                        brdp->brdnr * STL_MAXPORTS + j, NULL);
                        stl_nrbrds = i + 1;
                }
        }
 
        /* this has to be _after_ isa finding because of locking */
        retval = pci_register_driver(&stl_pcidriver);
        if (retval && stl_nrbrds == 0) {
                printk(KERN_ERR "STALLION: can't register pci driver\n");
                goto err_unrtty;
        }
 
/*
 *      Set up a character driver for per board stuff. This is mainly used
 *      to do stats ioctls on the ports.
 */
        if (register_chrdev(STL_SIOMEMMAJOR, "staliomem", &stl_fsiomem))
                printk("STALLION: failed to register serial board device\n");
 
        stallion_class = class_create(THIS_MODULE, "staliomem");
        if (IS_ERR(stallion_class))
                printk("STALLION: failed to create class\n");
        for (i = 0; i < 4; i++)
                device_create(stallion_class, NULL, MKDEV(STL_SIOMEMMAJOR, i),
                              "staliomem%d", i);
 
        return 0;
err_unrtty:
        tty_unregister_driver(stl_serial);
err_frtty:
        put_tty_driver(stl_serial);
err:
        return retval;
}
 
static void __exit stallion_module_exit(void)
{
        struct stlbrd *brdp;
        unsigned int i, j;
 
        pr_debug("cleanup_module()\n");
 
        printk(KERN_INFO "Unloading %s: version %s\n", stl_drvtitle,
                stl_drvversion);
 
/*
 *      Free up all allocated resources used by the ports. This includes
 *      memory and interrupts. As part of this process we will also do
 *      a hangup on every open port - to try to flush out any processes
 *      hanging onto ports.
 */
        for (i = 0; i < stl_nrbrds; i++) {
                if ((brdp = stl_brds[i]) == NULL || (brdp->state & STL_PROBED))
                        continue;
                for (j = 0; j < brdp->nrports; j++)
                        tty_unregister_device(stl_serial,
                                brdp->brdnr * STL_MAXPORTS + j);
        }
 
        for (i = 0; i < 4; i++)
                device_destroy(stallion_class, MKDEV(STL_SIOMEMMAJOR, i));
        unregister_chrdev(STL_SIOMEMMAJOR, "staliomem");
        class_destroy(stallion_class);
 
        pci_unregister_driver(&stl_pcidriver);
 
        stl_free_isabrds();
 
        tty_unregister_driver(stl_serial);
        put_tty_driver(stl_serial);
}
 
module_init(stallion_module_init);
module_exit(stallion_module_exit);
 
MODULE_AUTHOR("Greg Ungerer");
MODULE_DESCRIPTION("Stallion Multiport Serial Driver");
MODULE_LICENSE("GPL");
Browse

Tools

Subversion Repositories test_project

[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [char/] [stallion.c] - Blame information for rev 65

Line No.	Rev	Author	Line
1	62	marcus.erl	`/*****************************************************************************/`
2
3			`/*`
4			`* stallion.c -- stallion multiport serial driver.`
5			`*`
6			`* Copyright (C) 1996-1999 Stallion Technologies`
7			`* Copyright (C) 1994-1996 Greg Ungerer.`
8			`*`
9			`* This code is loosely based on the Linux serial driver, written by`
10			`* Linus Torvalds, Theodore T'so and others.`
11			`*`
12			`* This program is free software; you can redistribute it and/or modify`
13			`* it under the terms of the GNU General Public License as published by`
14			`* the Free Software Foundation; either version 2 of the License, or`
15			`* (at your option) any later version.`
16			`*`
17			`* This program is distributed in the hope that it will be useful,`
18			`* but WITHOUT ANY WARRANTY; without even the implied warranty of`
19			`* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
20			`* GNU General Public License for more details.`
21			`*`
22			`* You should have received a copy of the GNU General Public License`
23			`* along with this program; if not, write to the Free Software`
24			`* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.`
25			`*/`
26
27			`/*****************************************************************************/`
28
29			`#include <linux/module.h>`
30			`#include <linux/slab.h>`
31			`#include <linux/interrupt.h>`
32			`#include <linux/tty.h>`
33			`#include <linux/tty_flip.h>`
34			`#include <linux/serial.h>`
35			`#include <linux/cd1400.h>`
36			`#include <linux/sc26198.h>`
37			`#include <linux/comstats.h>`
38			`#include <linux/stallion.h>`
39			`#include <linux/ioport.h>`
40			`#include <linux/init.h>`