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

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/*
 *      specialix.c  -- specialix IO8+ multiport serial driver.
 *
 *      Copyright (C) 1997  Roger Wolff (R.E.Wolff@BitWizard.nl)
 *      Copyright (C) 1994-1996  Dmitry Gorodchanin (pgmdsg@ibi.com)
 *
 *      Specialix pays for the development and support of this driver.
 *      Please DO contact io8-linux@specialix.co.uk if you require
 *      support. But please read the documentation (specialix.txt)
 *      first.
 *
 *      This driver was developped in the BitWizard linux device
 *      driver service. If you require a linux device driver for your
 *      product, please contact devices@BitWizard.nl for a quote.
 *
 *      This code is firmly based on the riscom/8 serial driver,
 *      written by Dmitry Gorodchanin. The specialix IO8+ card
 *      programming information was obtained from the CL-CD1865 Data
 *      Book, and Specialix document number 6200059: IO8+ Hardware
 *      Functional Specification.
 *
 *      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.
 *
 * Revision history:
 *
 * Revision 1.0:  April 1st 1997.
 *                Initial release for alpha testing.
 * Revision 1.1:  April 14th 1997.
 *                Incorporated Richard Hudsons suggestions,
 *                removed some debugging printk's.
 * Revision 1.2:  April 15th 1997.
 *                Ported to 2.1.x kernels.
 * Revision 1.3:  April 17th 1997
 *                Backported to 2.0. (Compatibility macros).
 * Revision 1.4:  April 18th 1997
 *                Fixed DTR/RTS bug that caused the card to indicate
 *                "don't send data" to a modem after the password prompt.
 *                Fixed bug for premature (fake) interrupts.
 * Revision 1.5:  April 19th 1997
 *                fixed a minor typo in the header file, cleanup a little.
 *                performance warnings are now MAXed at once per minute.
 * Revision 1.6:  May 23 1997
 *                Changed the specialix=... format to include interrupt.
 * Revision 1.7:  May 27 1997
 *                Made many more debug printk's a compile time option.
 * Revision 1.8:  Jul 1  1997
 *                port to linux-2.1.43 kernel.
 * Revision 1.9:  Oct 9  1998
 *                Added stuff for the IO8+/PCI version.
 * Revision 1.10: Oct 22  1999 / Jan 21 2000.
 *                Added stuff for setserial.
 *                Nicolas Mailhot (Nicolas.Mailhot@email.enst.fr)
 *
 */
 
#define VERSION "1.11"
 
 
/*
 * There is a bunch of documentation about the card, jumpers, config
 * settings, restrictions, cables, device names and numbers in
 * Documentation/specialix.txt
 */
 
#include <linux/module.h>
 
#include <asm/io.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/mm.h>
#include <linux/serial.h>
#include <linux/fcntl.h>
#include <linux/major.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <asm/uaccess.h>
 
#include "specialix_io8.h"
#include "cd1865.h"
 
 
/*
   This driver can spew a whole lot of debugging output at you. If you
   need maximum performance, you should disable the DEBUG define. To
   aid in debugging in the field, I'm leaving the compile-time debug
   features enabled, and disable them "runtime". That allows me to
   instruct people with problems to enable debugging without requiring
   them to recompile...
*/
#define DEBUG
 
static int sx_debug;
static int sx_rxfifo = SPECIALIX_RXFIFO;
 
#ifdef DEBUG
#define dprintk(f, str...) if (sx_debug & f) printk (str)
#else
#define dprintk(f, str...) /* nothing */
#endif
 
#define SX_DEBUG_FLOW    0x0001
#define SX_DEBUG_DATA    0x0002
#define SX_DEBUG_PROBE   0x0004
#define SX_DEBUG_CHAN    0x0008
#define SX_DEBUG_INIT    0x0010
#define SX_DEBUG_RX      0x0020
#define SX_DEBUG_TX      0x0040
#define SX_DEBUG_IRQ     0x0080
#define SX_DEBUG_OPEN    0x0100
#define SX_DEBUG_TERMIOS 0x0200
#define SX_DEBUG_SIGNALS 0x0400
#define SX_DEBUG_FIFO    0x0800
 
 
#define func_enter() dprintk (SX_DEBUG_FLOW, "io8: enter %s\n",__FUNCTION__)
#define func_exit()  dprintk (SX_DEBUG_FLOW, "io8: exit  %s\n", __FUNCTION__)
 
#define jiffies_from_ms(a) ((((a) * HZ)/1000)+1)
 
 
/* Configurable options: */
 
/* Am I paranoid or not ? ;-) */
#define SPECIALIX_PARANOIA_CHECK
 
/* Do I trust the IRQ from the card? (enabeling it doesn't seem to help)
   When the IRQ routine leaves the chip in a state that is keeps on
   requiring attention, the timer doesn't help either. */
#undef SPECIALIX_TIMER
 
#ifdef SPECIALIX_TIMER
static int sx_poll = HZ;
#endif
 
 
 
/*
 * The following defines are mostly for testing purposes. But if you need
 * some nice reporting in your syslog, you can define them also.
 */
#undef SX_REPORT_FIFO
#undef SX_REPORT_OVERRUN
 
 
 
#ifdef CONFIG_SPECIALIX_RTSCTS
#define SX_CRTSCTS(bla) 1
#else
#define SX_CRTSCTS(tty) C_CRTSCTS(tty)
#endif
 
 
/* Used to be outb (0xff, 0x80); */
#define short_pause() udelay (1)
 
 
#define SPECIALIX_LEGAL_FLAGS \
        (ASYNC_HUP_NOTIFY   | ASYNC_SAK          | ASYNC_SPLIT_TERMIOS   | \
         ASYNC_SPD_HI       | ASYNC_SPEED_VHI    | ASYNC_SESSION_LOCKOUT | \
         ASYNC_PGRP_LOCKOUT | ASYNC_CALLOUT_NOHUP)
 
#undef RS_EVENT_WRITE_WAKEUP
#define RS_EVENT_WRITE_WAKEUP   0
 
static struct tty_driver *specialix_driver;
 
static struct specialix_board sx_board[SX_NBOARD] =  {
        { 0, SX_IOBASE1,  9, },
        { 0, SX_IOBASE2, 11, },
        { 0, SX_IOBASE3, 12, },
        { 0, SX_IOBASE4, 15, },
};
 
static struct specialix_port sx_port[SX_NBOARD * SX_NPORT];
 
 
#ifdef SPECIALIX_TIMER
static struct timer_list missed_irq_timer;
static irqreturn_t sx_interrupt(int irq, void * dev_id);
#endif
 
 
 
static inline int sx_paranoia_check(struct specialix_port const * port,
                                    char *name, const char *routine)
{
#ifdef SPECIALIX_PARANOIA_CHECK
        static const char *badmagic =
                KERN_ERR "sx: Warning: bad specialix port magic number for device %s in %s\n";
        static const char *badinfo =
                KERN_ERR "sx: Warning: null specialix port for device %s in %s\n";
 
        if (!port) {
                printk(badinfo, name, routine);
                return 1;
        }
        if (port->magic != SPECIALIX_MAGIC) {
                printk(badmagic, name, routine);
                return 1;
        }
#endif
        return 0;
}
 
 
/*
 *
 *  Service functions for specialix IO8+ driver.
 *
 */
 
/* Get board number from pointer */
static inline int board_No (struct specialix_board * bp)
{
        return bp - sx_board;
}
 
 
/* Get port number from pointer */
static inline int port_No (struct specialix_port const * port)
{
        return SX_PORT(port - sx_port);
}
 
 
/* Get pointer to board from pointer to port */
static inline struct specialix_board * port_Board(struct specialix_port const * port)
{
        return &sx_board[SX_BOARD(port - sx_port)];
}
 
 
/* Input Byte from CL CD186x register */
static inline unsigned char sx_in(struct specialix_board  * bp, unsigned short reg)
{
        bp->reg = reg | 0x80;
        outb (reg | 0x80, bp->base + SX_ADDR_REG);
        return inb  (bp->base + SX_DATA_REG);
}
 
 
/* Output Byte to CL CD186x register */
static inline void sx_out(struct specialix_board  * bp, unsigned short reg,
                          unsigned char val)
{
        bp->reg = reg | 0x80;
        outb (reg | 0x80, bp->base + SX_ADDR_REG);
        outb (val, bp->base + SX_DATA_REG);
}
 
 
/* Input Byte from CL CD186x register */
static inline unsigned char sx_in_off(struct specialix_board  * bp, unsigned short reg)
{
        bp->reg = reg;
        outb (reg, bp->base + SX_ADDR_REG);
        return inb  (bp->base + SX_DATA_REG);
}
 
 
/* Output Byte to CL CD186x register */
static inline void sx_out_off(struct specialix_board  * bp, unsigned short reg,
                          unsigned char val)
{
        bp->reg = reg;
        outb (reg, bp->base + SX_ADDR_REG);
        outb (val, bp->base + SX_DATA_REG);
}
 
 
/* Wait for Channel Command Register ready */
static inline void sx_wait_CCR(struct specialix_board  * bp)
{
        unsigned long delay, flags;
        unsigned char ccr;
 
        for (delay = SX_CCR_TIMEOUT; delay; delay--) {
                spin_lock_irqsave(&bp->lock, flags);
                ccr = sx_in(bp, CD186x_CCR);
                spin_unlock_irqrestore(&bp->lock, flags);
                if (!ccr)
                        return;
                udelay (1);
        }
 
        printk(KERN_ERR "sx%d: Timeout waiting for CCR.\n", board_No(bp));
}
 
 
/* Wait for Channel Command Register ready */
static inline void sx_wait_CCR_off(struct specialix_board  * bp)
{
        unsigned long delay;
        unsigned char crr;
        unsigned long flags;
 
        for (delay = SX_CCR_TIMEOUT; delay; delay--) {
                spin_lock_irqsave(&bp->lock, flags);
                crr = sx_in_off(bp, CD186x_CCR);
                spin_unlock_irqrestore(&bp->lock, flags);
                if (!crr)
                        return;
                udelay (1);
        }
 
        printk(KERN_ERR "sx%d: Timeout waiting for CCR.\n", board_No(bp));
}
 
 
/*
 *  specialix IO8+ IO range functions.
 */
 
static inline int sx_request_io_range(struct specialix_board * bp)
{
        return request_region(bp->base,
                bp->flags & SX_BOARD_IS_PCI ? SX_PCI_IO_SPACE : SX_IO_SPACE,
                "specialix IO8+") == NULL;
}
 
 
static inline void sx_release_io_range(struct specialix_board * bp)
{
        release_region(bp->base,
                       bp->flags&SX_BOARD_IS_PCI?SX_PCI_IO_SPACE:SX_IO_SPACE);
}
 
 
/* Set the IRQ using the RTS lines that run to the PAL on the board.... */
static int sx_set_irq ( struct specialix_board *bp)
{
        int virq;
        int i;
        unsigned long flags;
 
        if (bp->flags & SX_BOARD_IS_PCI)
                return 1;
        switch (bp->irq) {
        /* In the same order as in the docs... */
        case 15: virq = 0;break;
        case 12: virq = 1;break;
        case 11: virq = 2;break;
        case 9:  virq = 3;break;
        default: printk (KERN_ERR "Speclialix: cannot set irq to %d.\n", bp->irq);
                 return 0;
        }
        spin_lock_irqsave(&bp->lock, flags);
        for (i=0;i<2;i++) {
                sx_out(bp, CD186x_CAR, i);
                sx_out(bp, CD186x_MSVRTS, ((virq >> i) & 0x1)? MSVR_RTS:0);
        }
        spin_unlock_irqrestore(&bp->lock, flags);
        return 1;
}
 
 
/* Reset and setup CD186x chip */
static int sx_init_CD186x(struct specialix_board  * bp)
{
        unsigned long flags;
        int scaler;
        int rv = 1;
 
        func_enter();
        sx_wait_CCR_off(bp);                       /* Wait for CCR ready        */
        spin_lock_irqsave(&bp->lock, flags);
        sx_out_off(bp, CD186x_CCR, CCR_HARDRESET);      /* Reset CD186x chip          */
        spin_unlock_irqrestore(&bp->lock, flags);
        msleep(50);                                     /* Delay 0.05 sec            */
        spin_lock_irqsave(&bp->lock, flags);
        sx_out_off(bp, CD186x_GIVR, SX_ID);             /* Set ID for this chip      */
        sx_out_off(bp, CD186x_GICR, 0);                 /* Clear all bits            */
        sx_out_off(bp, CD186x_PILR1, SX_ACK_MINT);      /* Prio for modem intr       */
        sx_out_off(bp, CD186x_PILR2, SX_ACK_TINT);      /* Prio for transmitter intr */
        sx_out_off(bp, CD186x_PILR3, SX_ACK_RINT);      /* Prio for receiver intr    */
        /* Set RegAckEn */
        sx_out_off(bp, CD186x_SRCR, sx_in (bp, CD186x_SRCR) | SRCR_REGACKEN);
 
        /* Setting up prescaler. We need 4 ticks per 1 ms */
        scaler =  SX_OSCFREQ/SPECIALIX_TPS;
 
        sx_out_off(bp, CD186x_PPRH, scaler >> 8);
        sx_out_off(bp, CD186x_PPRL, scaler & 0xff);
        spin_unlock_irqrestore(&bp->lock, flags);
 
        if (!sx_set_irq (bp)) {
                /* Figure out how to pass this along... */
                printk (KERN_ERR "Cannot set irq to %d.\n", bp->irq);
                rv = 0;
        }
 
        func_exit();
        return rv;
}
 
 
static int read_cross_byte (struct specialix_board *bp, int reg, int bit)
{
        int i;
        int t;
        unsigned long flags;
 
        spin_lock_irqsave(&bp->lock, flags);
        for (i=0, t=0;i<8;i++) {
                sx_out_off (bp, CD186x_CAR, i);
                if (sx_in_off (bp, reg) & bit)
                        t |= 1 << i;
        }
        spin_unlock_irqrestore(&bp->lock, flags);
 
        return t;
}
 
 
#ifdef SPECIALIX_TIMER
void missed_irq (unsigned long data)
{
        unsigned char irq;
        unsigned long flags;
        struct specialix_board  *bp = (struct specialix_board *)data;
 
        spin_lock_irqsave(&bp->lock, flags);
        irq = sx_in ((struct specialix_board *)data, CD186x_SRSR) &
                                                    (SRSR_RREQint |
                                                     SRSR_TREQint |
                                                     SRSR_MREQint);
        spin_unlock_irqrestore(&bp->lock, flags);
        if (irq) {
                printk (KERN_INFO "Missed interrupt... Calling int from timer. \n");
                sx_interrupt (((struct specialix_board *)data)->irq,
                                (void*)data);
        }
        mod_timer(&missed_irq_timer, jiffies + sx_poll);
}
#endif
 
 
 
/* Main probing routine, also sets irq. */
static int sx_probe(struct specialix_board *bp)
{
        unsigned char val1, val2;
#if 0
        int irqs = 0;
        int retries;
#endif
        int rev;
        int chip;
 
        func_enter();
 
        if (sx_request_io_range(bp)) {
                func_exit();
                return 1;
        }
 
        /* Are the I/O ports here ? */
        sx_out_off(bp, CD186x_PPRL, 0x5a);
        short_pause ();
        val1 = sx_in_off(bp, CD186x_PPRL);
 
        sx_out_off(bp, CD186x_PPRL, 0xa5);
        short_pause ();
        val2 = sx_in_off(bp, CD186x_PPRL);
 
 
        if ((val1 != 0x5a) || (val2 != 0xa5)) {
                printk(KERN_INFO "sx%d: specialix IO8+ Board at 0x%03x not found.\n",
                       board_No(bp), bp->base);
                sx_release_io_range(bp);
                func_exit();
                return 1;
        }
 
        /* Check the DSR lines that Specialix uses as board
           identification */
        val1 = read_cross_byte (bp, CD186x_MSVR, MSVR_DSR);
        val2 = read_cross_byte (bp, CD186x_MSVR, MSVR_RTS);
        dprintk (SX_DEBUG_INIT, "sx%d: DSR lines are: %02x, rts lines are: %02x\n",
                board_No(bp),  val1, val2);
 
        /* They managed to switch the bit order between the docs and
           the IO8+ card. The new PCI card now conforms to old docs.
           They changed the PCI docs to reflect the situation on the
           old card. */
        val2 = (bp->flags & SX_BOARD_IS_PCI)?0x4d : 0xb2;
        if (val1 != val2) {
                printk(KERN_INFO "sx%d: specialix IO8+ ID %02x at 0x%03x not found (%02x).\n",
                       board_No(bp), val2, bp->base, val1);
                sx_release_io_range(bp);
                func_exit();
                return 1;
        }
 
 
#if 0
        /* It's time to find IRQ for this board */
        for (retries = 0; retries < 5 && irqs <= 0; retries++) {
                irqs = probe_irq_on();
                sx_init_CD186x(bp);                     /* Reset CD186x chip       */
                sx_out(bp, CD186x_CAR, 2);               /* Select port 2          */
                sx_wait_CCR(bp);
                sx_out(bp, CD186x_CCR, CCR_TXEN);        /* Enable transmitter     */
                sx_out(bp, CD186x_IER, IER_TXRDY);       /* Enable tx empty intr   */
                msleep(50);
                irqs = probe_irq_off(irqs);
 
                dprintk (SX_DEBUG_INIT, "SRSR = %02x, ", sx_in(bp, CD186x_SRSR));
                dprintk (SX_DEBUG_INIT, "TRAR = %02x, ", sx_in(bp, CD186x_TRAR));
                dprintk (SX_DEBUG_INIT, "GIVR = %02x, ", sx_in(bp, CD186x_GIVR));
                dprintk (SX_DEBUG_INIT, "GICR = %02x, ", sx_in(bp, CD186x_GICR));
                dprintk (SX_DEBUG_INIT, "\n");
 
                /* Reset CD186x again      */
                if (!sx_init_CD186x(bp)) {
                        /* Hmmm. This is dead code anyway. */
                }
 
                dprintk (SX_DEBUG_INIT "val1 = %02x, val2 = %02x, val3 = %02x.\n",
                        val1, val2, val3);
 
        }
 
#if 0
        if (irqs <= 0) {
                printk(KERN_ERR "sx%d: Can't find IRQ for specialix IO8+ board at 0x%03x.\n",
                       board_No(bp), bp->base);
                sx_release_io_range(bp);
                func_exit();
                return 1;
        }
#endif
        printk (KERN_INFO "Started with irq=%d, but now have irq=%d.\n", bp->irq, irqs);
        if (irqs > 0)
                bp->irq = irqs;
#endif
        /* Reset CD186x again  */
        if (!sx_init_CD186x(bp)) {
                sx_release_io_range(bp);
                func_exit();
                return 1;
        }
 
        sx_request_io_range(bp);
        bp->flags |= SX_BOARD_PRESENT;
 
        /* Chip           revcode   pkgtype
                          GFRCR     SRCR bit 7
           CD180 rev B    0x81      0
           CD180 rev C    0x82      0
           CD1864 rev A   0x82      1
           CD1865 rev A   0x83      1  -- Do not use!!! Does not work.
           CD1865 rev B   0x84      1
         -- Thanks to Gwen Wang, Cirrus Logic.
         */
 
        switch (sx_in_off(bp, CD186x_GFRCR)) {
        case 0x82:chip = 1864;rev='A';break;
        case 0x83:chip = 1865;rev='A';break;
        case 0x84:chip = 1865;rev='B';break;
        case 0x85:chip = 1865;rev='C';break; /* Does not exist at this time */
        default:chip=-1;rev='x';
        }
 
        dprintk (SX_DEBUG_INIT, " GFCR = 0x%02x\n", sx_in_off(bp, CD186x_GFRCR) );
 
#ifdef SPECIALIX_TIMER
        setup_timer(&missed_irq_timer, missed_irq, (unsigned long)bp);
        mod_timer(&missed_irq_timer, jiffies + sx_poll);
#endif
 
        printk(KERN_INFO"sx%d: specialix IO8+ board detected at 0x%03x, IRQ %d, CD%d Rev. %c.\n",
               board_No(bp),
               bp->base, bp->irq,
               chip, rev);
 
        func_exit();
        return 0;
}
 
/*
 *
 *  Interrupt processing routines.
 * */
 
static inline void sx_mark_event(struct specialix_port * port, int event)
{
        func_enter();
 
        set_bit(event, &port->event);
        schedule_work(&port->tqueue);
 
        func_exit();
}
 
 
static inline struct specialix_port * sx_get_port(struct specialix_board * bp,
                                               unsigned char const * what)
{
        unsigned char channel;
        struct specialix_port * port = NULL;
 
        channel = sx_in(bp, CD186x_GICR) >> GICR_CHAN_OFF;
        dprintk (SX_DEBUG_CHAN, "channel: %d\n", channel);
        if (channel < CD186x_NCH) {
                port = &sx_port[board_No(bp) * SX_NPORT + channel];
                dprintk (SX_DEBUG_CHAN, "port: %d %p flags: 0x%x\n",board_No(bp) * SX_NPORT + channel,  port, port->flags & ASYNC_INITIALIZED);
 
                if (port->flags & ASYNC_INITIALIZED) {
                        dprintk (SX_DEBUG_CHAN, "port: %d %p\n", channel, port);
                        func_exit();
                        return port;
                }
        }
        printk(KERN_INFO "sx%d: %s interrupt from invalid port %d\n",
               board_No(bp), what, channel);
        return NULL;
}
 
 
static inline void sx_receive_exc(struct specialix_board * bp)
{
        struct specialix_port *port;
        struct tty_struct *tty;
        unsigned char status;
        unsigned char ch, flag;
 
        func_enter();
 
        port = sx_get_port(bp, "Receive");
        if (!port) {
                dprintk (SX_DEBUG_RX, "Hmm, couldn't find port.\n");
                func_exit();
                return;
        }
        tty = port->tty;
 
        status = sx_in(bp, CD186x_RCSR);
 
        dprintk (SX_DEBUG_RX, "status: 0x%x\n", status);
        if (status & RCSR_OE) {
                port->overrun++;
                dprintk(SX_DEBUG_FIFO, "sx%d: port %d: Overrun. Total %ld overruns.\n",
                       board_No(bp), port_No(port), port->overrun);
        }
        status &= port->mark_mask;
 
        /* This flip buffer check needs to be below the reading of the
           status register to reset the chip's IRQ.... */
        if (tty_buffer_request_room(tty, 1) == 0) {
                dprintk(SX_DEBUG_FIFO, "sx%d: port %d: Working around flip buffer overflow.\n",
                       board_No(bp), port_No(port));
                func_exit();
                return;
        }
 
        ch = sx_in(bp, CD186x_RDR);
        if (!status) {
                func_exit();
                return;
        }
        if (status & RCSR_TOUT) {
                printk(KERN_INFO "sx%d: port %d: Receiver timeout. Hardware problems ?\n",
                       board_No(bp), port_No(port));
                func_exit();
                return;
 
        } else if (status & RCSR_BREAK) {
                dprintk(SX_DEBUG_RX, "sx%d: port %d: Handling break...\n",
                       board_No(bp), port_No(port));
                flag = TTY_BREAK;
                if (port->flags & ASYNC_SAK)
                        do_SAK(tty);
 
        } else if (status & RCSR_PE)
                flag = TTY_PARITY;
 
        else if (status & RCSR_FE)
                flag = TTY_FRAME;
 
        else if (status & RCSR_OE)
                flag = TTY_OVERRUN;
 
        else
                flag = TTY_NORMAL;
 
        if(tty_insert_flip_char(tty, ch, flag))
                tty_flip_buffer_push(tty);
        func_exit();
}
 
 
static inline void sx_receive(struct specialix_board * bp)
{
        struct specialix_port *port;
        struct tty_struct *tty;
        unsigned char count;
 
        func_enter();
 
        if (!(port = sx_get_port(bp, "Receive"))) {
                dprintk (SX_DEBUG_RX, "Hmm, couldn't find port.\n");
                func_exit();
                return;
        }
        tty = port->tty;
 
        count = sx_in(bp, CD186x_RDCR);
        dprintk (SX_DEBUG_RX, "port: %p: count: %d\n", port, count);
        port->hits[count > 8 ? 9 : count]++;
 
        tty_buffer_request_room(tty, count);
 
        while (count--)
                tty_insert_flip_char(tty, sx_in(bp, CD186x_RDR), TTY_NORMAL);
        tty_flip_buffer_push(tty);
        func_exit();
}
 
 
static inline void sx_transmit(struct specialix_board * bp)
{
        struct specialix_port *port;
        struct tty_struct *tty;
        unsigned char count;
 
        func_enter();
        if (!(port = sx_get_port(bp, "Transmit"))) {
                func_exit();
                return;
        }
        dprintk (SX_DEBUG_TX, "port: %p\n", port);
        tty = port->tty;
 
        if (port->IER & IER_TXEMPTY) {
                /* FIFO drained */
                sx_out(bp, CD186x_CAR, port_No(port));
                port->IER &= ~IER_TXEMPTY;
                sx_out(bp, CD186x_IER, port->IER);
                func_exit();
                return;
        }
 
        if ((port->xmit_cnt <= 0 && !port->break_length)
            || tty->stopped || tty->hw_stopped) {
                sx_out(bp, CD186x_CAR, port_No(port));
                port->IER &= ~IER_TXRDY;
                sx_out(bp, CD186x_IER, port->IER);
                func_exit();
                return;
        }
 
        if (port->break_length) {
                if (port->break_length > 0) {
                        if (port->COR2 & COR2_ETC) {
                                sx_out(bp, CD186x_TDR, CD186x_C_ESC);
                                sx_out(bp, CD186x_TDR, CD186x_C_SBRK);
                                port->COR2 &= ~COR2_ETC;
                        }
                        count = min_t(int, port->break_length, 0xff);
                        sx_out(bp, CD186x_TDR, CD186x_C_ESC);
                        sx_out(bp, CD186x_TDR, CD186x_C_DELAY);
                        sx_out(bp, CD186x_TDR, count);
                        if (!(port->break_length -= count))
                                port->break_length--;
                } else {
                        sx_out(bp, CD186x_TDR, CD186x_C_ESC);
                        sx_out(bp, CD186x_TDR, CD186x_C_EBRK);
                        sx_out(bp, CD186x_COR2, port->COR2);
                        sx_wait_CCR(bp);
                        sx_out(bp, CD186x_CCR, CCR_CORCHG2);
                        port->break_length = 0;
                }
 
                func_exit();
                return;
        }
 
        count = CD186x_NFIFO;
        do {
                sx_out(bp, CD186x_TDR, port->xmit_buf[port->xmit_tail++]);
                port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE-1);
                if (--port->xmit_cnt <= 0)
                        break;
        } while (--count > 0);
 
        if (port->xmit_cnt <= 0) {
                sx_out(bp, CD186x_CAR, port_No(port));
                port->IER &= ~IER_TXRDY;
                sx_out(bp, CD186x_IER, port->IER);
        }
        if (port->xmit_cnt <= port->wakeup_chars)
                sx_mark_event(port, RS_EVENT_WRITE_WAKEUP);
 
        func_exit();
}
 
 
static inline void sx_check_modem(struct specialix_board * bp)
{
        struct specialix_port *port;
        struct tty_struct *tty;
        unsigned char mcr;
        int msvr_cd;
 
        dprintk (SX_DEBUG_SIGNALS, "Modem intr. ");
        if (!(port = sx_get_port(bp, "Modem")))
                return;
 
        tty = port->tty;
 
        mcr = sx_in(bp, CD186x_MCR);
        printk ("mcr = %02x.\n", mcr);
 
        if ((mcr & MCR_CDCHG)) {
                dprintk (SX_DEBUG_SIGNALS, "CD just changed... ");
                msvr_cd = sx_in(bp, CD186x_MSVR) & MSVR_CD;
                if (msvr_cd) {
                        dprintk (SX_DEBUG_SIGNALS, "Waking up guys in open.\n");
                        wake_up_interruptible(&port->open_wait);
                } else {
                        dprintk (SX_DEBUG_SIGNALS, "Sending HUP.\n");
                        schedule_work(&port->tqueue_hangup);
                }
        }
 
#ifdef SPECIALIX_BRAIN_DAMAGED_CTS
        if (mcr & MCR_CTSCHG) {
                if (sx_in(bp, CD186x_MSVR) & MSVR_CTS) {
                        tty->hw_stopped = 0;
                        port->IER |= IER_TXRDY;
                        if (port->xmit_cnt <= port->wakeup_chars)
                                sx_mark_event(port, RS_EVENT_WRITE_WAKEUP);
                } else {
                        tty->hw_stopped = 1;
                        port->IER &= ~IER_TXRDY;
                }
                sx_out(bp, CD186x_IER, port->IER);
        }
        if (mcr & MCR_DSSXHG) {
                if (sx_in(bp, CD186x_MSVR) & MSVR_DSR) {
                        tty->hw_stopped = 0;
                        port->IER |= IER_TXRDY;
                        if (port->xmit_cnt <= port->wakeup_chars)
                                sx_mark_event(port, RS_EVENT_WRITE_WAKEUP);
                } else {
                        tty->hw_stopped = 1;
                        port->IER &= ~IER_TXRDY;
                }
                sx_out(bp, CD186x_IER, port->IER);
        }
#endif /* SPECIALIX_BRAIN_DAMAGED_CTS */
 
        /* Clear change bits */
        sx_out(bp, CD186x_MCR, 0);
}
 
 
/* The main interrupt processing routine */
static irqreturn_t sx_interrupt(int irq, void *dev_id)
{
        unsigned char status;
        unsigned char ack;
        struct specialix_board *bp;
        unsigned long loop = 0;
        int saved_reg;
        unsigned long flags;
 
        func_enter();
 
        bp = dev_id;
        spin_lock_irqsave(&bp->lock, flags);
 
        dprintk (SX_DEBUG_FLOW, "enter %s port %d room: %ld\n", __FUNCTION__, port_No(sx_get_port(bp, "INT")), SERIAL_XMIT_SIZE - sx_get_port(bp, "ITN")->xmit_cnt - 1);
        if (!(bp->flags & SX_BOARD_ACTIVE)) {
                dprintk (SX_DEBUG_IRQ, "sx: False interrupt. irq %d.\n", irq);
                spin_unlock_irqrestore(&bp->lock, flags);
                func_exit();
                return IRQ_NONE;
        }
 
        saved_reg = bp->reg;
 
        while ((++loop < 16) && (status = (sx_in(bp, CD186x_SRSR) &
                                           (SRSR_RREQint |
                                            SRSR_TREQint |
                                            SRSR_MREQint)))) {
                if (status & SRSR_RREQint) {
                        ack = sx_in(bp, CD186x_RRAR);
 
                        if (ack == (SX_ID | GIVR_IT_RCV))
                                sx_receive(bp);
                        else if (ack == (SX_ID | GIVR_IT_REXC))
                                sx_receive_exc(bp);
                        else
                                printk(KERN_ERR "sx%d: status: 0x%x Bad receive ack 0x%02x.\n",
                                       board_No(bp), status, ack);
 
                } else if (status & SRSR_TREQint) {
                        ack = sx_in(bp, CD186x_TRAR);
 
                        if (ack == (SX_ID | GIVR_IT_TX))
                                sx_transmit(bp);
                        else
                                printk(KERN_ERR "sx%d: status: 0x%x Bad transmit ack 0x%02x. port: %d\n",
                                       board_No(bp), status, ack, port_No (sx_get_port (bp, "Int")));
                } else if (status & SRSR_MREQint) {
                        ack = sx_in(bp, CD186x_MRAR);
 
                        if (ack == (SX_ID | GIVR_IT_MODEM))
                                sx_check_modem(bp);
                        else
                                printk(KERN_ERR "sx%d: status: 0x%x Bad modem ack 0x%02x.\n",
                                       board_No(bp), status, ack);
 
                }
 
                sx_out(bp, CD186x_EOIR, 0);   /* Mark end of interrupt */
        }
        bp->reg = saved_reg;
        outb (bp->reg, bp->base + SX_ADDR_REG);
        spin_unlock_irqrestore(&bp->lock, flags);
        func_exit();
        return IRQ_HANDLED;
}
 
 
/*
 *  Routines for open & close processing.
 */
 
static void turn_ints_off (struct specialix_board *bp)
{
        unsigned long flags;
 
        func_enter();
        if (bp->flags & SX_BOARD_IS_PCI) {
                /* This was intended for enabeling the interrupt on the
                 * PCI card. However it seems that it's already enabled
                 * and as PCI interrupts can be shared, there is no real
                 * reason to have to turn it off. */
        }
 
        spin_lock_irqsave(&bp->lock, flags);
        (void) sx_in_off (bp, 0); /* Turn off interrupts. */
        spin_unlock_irqrestore(&bp->lock, flags);
 
        func_exit();
}
 
static void turn_ints_on (struct specialix_board *bp)
{
        unsigned long flags;
 
        func_enter();
 
        if (bp->flags & SX_BOARD_IS_PCI) {
                /* play with the PCI chip. See comment above. */
        }
        spin_lock_irqsave(&bp->lock, flags);
        (void) sx_in (bp, 0); /* Turn ON interrupts. */
        spin_unlock_irqrestore(&bp->lock, flags);
 
        func_exit();
}
 
 
/* Called with disabled interrupts */
static inline int sx_setup_board(struct specialix_board * bp)
{
        int error;
 
        if (bp->flags & SX_BOARD_ACTIVE)
                return 0;
 
        if (bp->flags & SX_BOARD_IS_PCI)
                error = request_irq(bp->irq, sx_interrupt, IRQF_DISABLED | IRQF_SHARED, "specialix IO8+", bp);
        else
                error = request_irq(bp->irq, sx_interrupt, IRQF_DISABLED, "specialix IO8+", bp);
 
        if (error)
                return error;
 
        turn_ints_on (bp);
        bp->flags |= SX_BOARD_ACTIVE;
 
        return 0;
}
 
 
/* Called with disabled interrupts */
static inline void sx_shutdown_board(struct specialix_board *bp)
{
        func_enter();
 
        if (!(bp->flags & SX_BOARD_ACTIVE)) {
                func_exit();
                return;
        }
 
        bp->flags &= ~SX_BOARD_ACTIVE;
 
        dprintk (SX_DEBUG_IRQ, "Freeing IRQ%d for board %d.\n",
                 bp->irq, board_No (bp));
        free_irq(bp->irq, bp);
 
        turn_ints_off (bp);
 
 
        func_exit();
}
 
 
/*
 * Setting up port characteristics.
 * Must be called with disabled interrupts
 */
static void sx_change_speed(struct specialix_board *bp, struct specialix_port *port)
{
        struct tty_struct *tty;
        unsigned long baud;
        long tmp;
        unsigned char cor1 = 0, cor3 = 0;
        unsigned char mcor1 = 0, mcor2 = 0;
        static unsigned long again;
        unsigned long flags;
 
        func_enter();
 
        if (!(tty = port->tty) || !tty->termios) {
                func_exit();
                return;
        }
 
        port->IER  = 0;
        port->COR2 = 0;
        /* Select port on the board */
        spin_lock_irqsave(&bp->lock, flags);
        sx_out(bp, CD186x_CAR, port_No(port));
 
        /* The Specialix board doens't implement the RTS lines.
           They are used to set the IRQ level. Don't touch them. */
        if (SX_CRTSCTS(tty))
                port->MSVR = MSVR_DTR | (sx_in(bp, CD186x_MSVR) & MSVR_RTS);
        else
                port->MSVR =  (sx_in(bp, CD186x_MSVR) & MSVR_RTS);
        spin_unlock_irqrestore(&bp->lock, flags);
        dprintk (SX_DEBUG_TERMIOS, "sx: got MSVR=%02x.\n", port->MSVR);
        baud = tty_get_baud_rate(tty);
 
        if (baud == 38400) {
                if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
                        baud = 57600;
                if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
                        baud = 115200;
        }
 
        if (!baud) {
                /* Drop DTR & exit */
                dprintk (SX_DEBUG_TERMIOS, "Dropping DTR...  Hmm....\n");
                if (!SX_CRTSCTS (tty)) {
                        port -> MSVR &= ~ MSVR_DTR;
                        spin_lock_irqsave(&bp->lock, flags);
                        sx_out(bp, CD186x_MSVR, port->MSVR );
                        spin_unlock_irqrestore(&bp->lock, flags);
                }
                else
                        dprintk (SX_DEBUG_TERMIOS, "Can't drop DTR: no DTR.\n");
                return;
        } else {
                /* Set DTR on */
                if (!SX_CRTSCTS (tty)) {
                        port ->MSVR |= MSVR_DTR;
                }
        }
 
        /*
         * Now we must calculate some speed depended things
         */
 
        /* Set baud rate for port */
        tmp = port->custom_divisor ;
        if ( tmp )
                printk (KERN_INFO "sx%d: Using custom baud rate divisor %ld. \n"
                                  "This is an untested option, please be carefull.\n",
                                  port_No (port), tmp);
        else
                tmp = (((SX_OSCFREQ + baud/2) / baud +
                         CD186x_TPC/2) / CD186x_TPC);
 
        if ((tmp < 0x10) && time_before(again, jiffies)) {
                again = jiffies + HZ * 60;
                /* Page 48 of version 2.0 of the CL-CD1865 databook */
                if (tmp >= 12) {
                        printk (KERN_INFO "sx%d: Baud rate divisor is %ld. \n"
                                "Performance degradation is possible.\n"
                                "Read specialix.txt for more info.\n",
                                port_No (port), tmp);
                } else {
                        printk (KERN_INFO "sx%d: Baud rate divisor is %ld. \n"
                                "Warning: overstressing Cirrus chip. "
                                "This might not work.\n"
                                "Read specialix.txt for more info.\n",
                                port_No (port), tmp);
                }
        }
        spin_lock_irqsave(&bp->lock, flags);
        sx_out(bp, CD186x_RBPRH, (tmp >> 8) & 0xff);
        sx_out(bp, CD186x_TBPRH, (tmp >> 8) & 0xff);
        sx_out(bp, CD186x_RBPRL, tmp & 0xff);
        sx_out(bp, CD186x_TBPRL, tmp & 0xff);
        spin_unlock_irqrestore(&bp->lock, flags);
        if (port->custom_divisor)
                baud = (SX_OSCFREQ + port->custom_divisor/2) / port->custom_divisor;
        baud = (baud + 5) / 10;         /* Estimated CPS */
 
        /* Two timer ticks seems enough to wakeup something like SLIP driver */
        tmp = ((baud + HZ/2) / HZ) * 2 - CD186x_NFIFO;
        port->wakeup_chars = (tmp < 0) ? 0 : ((tmp >= SERIAL_XMIT_SIZE) ?
                                              SERIAL_XMIT_SIZE - 1 : tmp);
 
        /* Receiver timeout will be transmission time for 1.5 chars */
        tmp = (SPECIALIX_TPS + SPECIALIX_TPS/2 + baud/2) / baud;
        tmp = (tmp > 0xff) ? 0xff : tmp;
        spin_lock_irqsave(&bp->lock, flags);
        sx_out(bp, CD186x_RTPR, tmp);
        spin_unlock_irqrestore(&bp->lock, flags);
        switch (C_CSIZE(tty)) {
         case CS5:
                cor1 |= COR1_5BITS;
                break;
         case CS6:
                cor1 |= COR1_6BITS;
                break;
         case CS7:
                cor1 |= COR1_7BITS;
                break;
         case CS8:
                cor1 |= COR1_8BITS;
                break;
        }
 
        if (C_CSTOPB(tty))
                cor1 |= COR1_2SB;
 
        cor1 |= COR1_IGNORE;
        if (C_PARENB(tty)) {
                cor1 |= COR1_NORMPAR;
                if (C_PARODD(tty))
                        cor1 |= COR1_ODDP;
                if (I_INPCK(tty))
                        cor1 &= ~COR1_IGNORE;
        }
        /* Set marking of some errors */
        port->mark_mask = RCSR_OE | RCSR_TOUT;
        if (I_INPCK(tty))
                port->mark_mask |= RCSR_FE | RCSR_PE;
        if (I_BRKINT(tty) || I_PARMRK(tty))
                port->mark_mask |= RCSR_BREAK;
        if (I_IGNPAR(tty))
                port->mark_mask &= ~(RCSR_FE | RCSR_PE);
        if (I_IGNBRK(tty)) {
                port->mark_mask &= ~RCSR_BREAK;
                if (I_IGNPAR(tty))
                        /* Real raw mode. Ignore all */
                        port->mark_mask &= ~RCSR_OE;
        }
        /* Enable Hardware Flow Control */
        if (C_CRTSCTS(tty)) {
#ifdef SPECIALIX_BRAIN_DAMAGED_CTS
                port->IER |= IER_DSR | IER_CTS;
                mcor1 |= MCOR1_DSRZD | MCOR1_CTSZD;
                mcor2 |= MCOR2_DSROD | MCOR2_CTSOD;
                spin_lock_irqsave(&bp->lock, flags);
                tty->hw_stopped = !(sx_in(bp, CD186x_MSVR) & (MSVR_CTS|MSVR_DSR));
                spin_unlock_irqrestore(&bp->lock, flags);
#else
                port->COR2 |= COR2_CTSAE;
#endif
        }
        /* Enable Software Flow Control. FIXME: I'm not sure about this */
        /* Some people reported that it works, but I still doubt it */
        if (I_IXON(tty)) {
                port->COR2 |= COR2_TXIBE;
                cor3 |= (COR3_FCT | COR3_SCDE);
                if (I_IXANY(tty))
                        port->COR2 |= COR2_IXM;
                spin_lock_irqsave(&bp->lock, flags);
                sx_out(bp, CD186x_SCHR1, START_CHAR(tty));
                sx_out(bp, CD186x_SCHR2, STOP_CHAR(tty));
                sx_out(bp, CD186x_SCHR3, START_CHAR(tty));
                sx_out(bp, CD186x_SCHR4, STOP_CHAR(tty));
                spin_unlock_irqrestore(&bp->lock, flags);
        }
        if (!C_CLOCAL(tty)) {
                /* Enable CD check */
                port->IER |= IER_CD;
                mcor1 |= MCOR1_CDZD;
                mcor2 |= MCOR2_CDOD;
        }
 
        if (C_CREAD(tty))
                /* Enable receiver */
                port->IER |= IER_RXD;
 
        /* Set input FIFO size (1-8 bytes) */
        cor3 |= sx_rxfifo;
        /* Setting up CD186x channel registers */
        spin_lock_irqsave(&bp->lock, flags);
        sx_out(bp, CD186x_COR1, cor1);
        sx_out(bp, CD186x_COR2, port->COR2);
        sx_out(bp, CD186x_COR3, cor3);
        spin_unlock_irqrestore(&bp->lock, flags);
        /* Make CD186x know about registers change */
        sx_wait_CCR(bp);
        spin_lock_irqsave(&bp->lock, flags);
        sx_out(bp, CD186x_CCR, CCR_CORCHG1 | CCR_CORCHG2 | CCR_CORCHG3);
        /* Setting up modem option registers */
        dprintk (SX_DEBUG_TERMIOS, "Mcor1 = %02x, mcor2 = %02x.\n", mcor1, mcor2);
        sx_out(bp, CD186x_MCOR1, mcor1);
        sx_out(bp, CD186x_MCOR2, mcor2);
        spin_unlock_irqrestore(&bp->lock, flags);
        /* Enable CD186x transmitter & receiver */
        sx_wait_CCR(bp);
        spin_lock_irqsave(&bp->lock, flags);
        sx_out(bp, CD186x_CCR, CCR_TXEN | CCR_RXEN);
        /* Enable interrupts */
        sx_out(bp, CD186x_IER, port->IER);
        /* And finally set the modem lines... */
        sx_out(bp, CD186x_MSVR, port->MSVR);
        spin_unlock_irqrestore(&bp->lock, flags);
 
        func_exit();
}
 
 
/* Must be called with interrupts enabled */
static int sx_setup_port(struct specialix_board *bp, struct specialix_port *port)
{
        unsigned long flags;
 
        func_enter();
 
        if (port->flags & ASYNC_INITIALIZED) {
                func_exit();
                return 0;
        }
 
        if (!port->xmit_buf) {
                /* We may sleep in get_zeroed_page() */
                unsigned long tmp;
 
                if (!(tmp = get_zeroed_page(GFP_KERNEL))) {
                        func_exit();
                        return -ENOMEM;
                }
 
                if (port->xmit_buf) {
                        free_page(tmp);
                        func_exit();
                        return -ERESTARTSYS;
                }
                port->xmit_buf = (unsigned char *) tmp;
        }
 
        spin_lock_irqsave(&port->lock, flags);
 
        if (port->tty)
                clear_bit(TTY_IO_ERROR, &port->tty->flags);
 
        port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
        sx_change_speed(bp, port);
        port->flags |= ASYNC_INITIALIZED;
 
        spin_unlock_irqrestore(&port->lock, flags);
 
 
        func_exit();
        return 0;
}
 
 
/* Must be called with interrupts disabled */
static void sx_shutdown_port(struct specialix_board *bp, struct specialix_port *port)
{
        struct tty_struct *tty;
        int i;
        unsigned long flags;
 
        func_enter();
 
        if (!(port->flags & ASYNC_INITIALIZED)) {
                func_exit();
                return;
        }
 
        if (sx_debug & SX_DEBUG_FIFO) {
                dprintk(SX_DEBUG_FIFO, "sx%d: port %d: %ld overruns, FIFO hits [ ",
                        board_No(bp), port_No(port), port->overrun);
                for (i = 0; i < 10; i++) {
                        dprintk(SX_DEBUG_FIFO, "%ld ", port->hits[i]);
                }
                dprintk(SX_DEBUG_FIFO, "].\n");
        }
 
        if (port->xmit_buf) {
                free_page((unsigned long) port->xmit_buf);
                port->xmit_buf = NULL;
        }
 
        /* Select port */
        spin_lock_irqsave(&bp->lock, flags);
        sx_out(bp, CD186x_CAR, port_No(port));
 
        if (!(tty = port->tty) || C_HUPCL(tty)) {
                /* Drop DTR */
                sx_out(bp, CD186x_MSVDTR, 0);
        }
        spin_unlock_irqrestore(&bp->lock, flags);
        /* Reset port */
        sx_wait_CCR(bp);
        spin_lock_irqsave(&bp->lock, flags);
        sx_out(bp, CD186x_CCR, CCR_SOFTRESET);
        /* Disable all interrupts from this port */
        port->IER = 0;
        sx_out(bp, CD186x_IER, port->IER);
        spin_unlock_irqrestore(&bp->lock, flags);
        if (tty)
                set_bit(TTY_IO_ERROR, &tty->flags);
        port->flags &= ~ASYNC_INITIALIZED;
 
        if (!bp->count)
                sx_shutdown_board(bp);
        func_exit();
}
 
 
static int block_til_ready(struct tty_struct *tty, struct file * filp,
                           struct specialix_port *port)
{
        DECLARE_WAITQUEUE(wait,  current);
        struct specialix_board *bp = port_Board(port);
        int    retval;
        int    do_clocal = 0;
        int    CD;
        unsigned long flags;
 
        func_enter();
 
        /*
         * If the device is in the middle of being closed, then block
         * until it's done, and then try again.
         */
        if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
                interruptible_sleep_on(&port->close_wait);
                if (port->flags & ASYNC_HUP_NOTIFY) {
                        func_exit();
                        return -EAGAIN;
                } else {
                        func_exit();
                        return -ERESTARTSYS;
                }
        }
 
        /*
         * If non-blocking mode is set, or the port is not enabled,
         * then make the check up front and then exit.
         */
        if ((filp->f_flags & O_NONBLOCK) ||
            (tty->flags & (1 << TTY_IO_ERROR))) {
                port->flags |= ASYNC_NORMAL_ACTIVE;
                func_exit();
                return 0;
        }
 
        if (C_CLOCAL(tty))
                do_clocal = 1;
 
        /*
         * Block waiting for the carrier detect and the line to become
         * free (i.e., not in use by the callout).  While we are in
         * this loop, info->count is dropped by one, so that
         * rs_close() knows when to free things.  We restore it upon
         * exit, either normal or abnormal.
         */
        retval = 0;
        add_wait_queue(&port->open_wait, &wait);
        spin_lock_irqsave(&port->lock, flags);
        if (!tty_hung_up_p(filp)) {
                port->count--;
        }
        spin_unlock_irqrestore(&port->lock, flags);
        port->blocked_open++;
        while (1) {
                spin_lock_irqsave(&bp->lock, flags);
                sx_out(bp, CD186x_CAR, port_No(port));
                CD = sx_in(bp, CD186x_MSVR) & MSVR_CD;
                if (SX_CRTSCTS (tty)) {
                        /* Activate RTS */
                        port->MSVR |= MSVR_DTR;         /* WTF? */
                        sx_out (bp, CD186x_MSVR, port->MSVR);
                } else {
                        /* Activate DTR */
                        port->MSVR |= MSVR_DTR;
                        sx_out (bp, CD186x_MSVR, port->MSVR);
                }
                spin_unlock_irqrestore(&bp->lock, flags);
                set_current_state(TASK_INTERRUPTIBLE);
                if (tty_hung_up_p(filp) ||
                    !(port->flags & ASYNC_INITIALIZED)) {
                        if (port->flags & ASYNC_HUP_NOTIFY)
                                retval = -EAGAIN;
                        else
                                retval = -ERESTARTSYS;
                        break;
                }
                if (!(port->flags & ASYNC_CLOSING) &&
                    (do_clocal || CD))
                        break;
                if (signal_pending(current)) {
                        retval = -ERESTARTSYS;
                        break;
                }
                schedule();
        }
 
        set_current_state(TASK_RUNNING);
        remove_wait_queue(&port->open_wait, &wait);
        spin_lock_irqsave(&port->lock, flags);
        if (!tty_hung_up_p(filp)) {
                port->count++;
        }
        port->blocked_open--;
        spin_unlock_irqrestore(&port->lock, flags);
        if (retval) {
                func_exit();
                return retval;
        }
 
        port->flags |= ASYNC_NORMAL_ACTIVE;
        func_exit();
        return 0;
}
 
 
static int sx_open(struct tty_struct * tty, struct file * filp)
{
        int board;
        int error;
        struct specialix_port * port;
        struct specialix_board * bp;
        int i;
        unsigned long flags;
 
        func_enter();
 
        board = SX_BOARD(tty->index);
 
        if (board >= SX_NBOARD || !(sx_board[board].flags & SX_BOARD_PRESENT)) {
                func_exit();
                return -ENODEV;
        }
 
        bp = &sx_board[board];
        port = sx_port + board * SX_NPORT + SX_PORT(tty->index);
        port->overrun = 0;
        for (i = 0; i < 10; i++)
                port->hits[i]=0;
 
        dprintk (SX_DEBUG_OPEN, "Board = %d, bp = %p, port = %p, portno = %d.\n",
                board, bp, port, SX_PORT(tty->index));
 
        if (sx_paranoia_check(port, tty->name, "sx_open")) {
                func_enter();
                return -ENODEV;
        }
 
        if ((error = sx_setup_board(bp))) {
                func_exit();
                return error;
        }
 
        spin_lock_irqsave(&bp->lock, flags);
        port->count++;
        bp->count++;
        tty->driver_data = port;
        port->tty = tty;
        spin_unlock_irqrestore(&bp->lock, flags);
 
        if ((error = sx_setup_port(bp, port))) {
                func_enter();
                return error;
        }
 
        if ((error = block_til_ready(tty, filp, port))) {
                func_enter();
                return error;
        }
 
        func_exit();
        return 0;
}
 
 
static void sx_close(struct tty_struct * tty, struct file * filp)
{
        struct specialix_port *port = (struct specialix_port *) tty->driver_data;
        struct specialix_board *bp;
        unsigned long flags;
        unsigned long timeout;
 
        func_enter();
        if (!port || sx_paranoia_check(port, tty->name, "close")) {
                func_exit();
                return;
        }
        spin_lock_irqsave(&port->lock, flags);
 
        if (tty_hung_up_p(filp)) {
                spin_unlock_irqrestore(&port->lock, flags);
                func_exit();
                return;
        }
 
        bp = port_Board(port);
        if ((tty->count == 1) && (port->count != 1)) {
                printk(KERN_ERR "sx%d: sx_close: bad port count;"
                       " tty->count is 1, port count is %d\n",
                       board_No(bp), port->count);
                port->count = 1;
        }
 
        if (port->count > 1) {
                port->count--;
                bp->count--;
 
                spin_unlock_irqrestore(&port->lock, flags);
 
                func_exit();
                return;
        }
        port->flags |= ASYNC_CLOSING;
        /*
         * Now we wait for the transmit buffer to clear; and we notify
         * the line discipline to only process XON/XOFF characters.
         */
        tty->closing = 1;
        spin_unlock_irqrestore(&port->lock, flags);
        dprintk (SX_DEBUG_OPEN, "Closing\n");
        if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
                tty_wait_until_sent(tty, port->closing_wait);
        }
        /*
         * At this point we stop accepting input.  To do this, we
         * disable the receive line status interrupts, and tell the
         * interrupt driver to stop checking the data ready bit in the
         * line status register.
         */
        dprintk (SX_DEBUG_OPEN, "Closed\n");
        port->IER &= ~IER_RXD;
        if (port->flags & ASYNC_INITIALIZED) {
                port->IER &= ~IER_TXRDY;
                port->IER |= IER_TXEMPTY;
                spin_lock_irqsave(&bp->lock, flags);
                sx_out(bp, CD186x_CAR, port_No(port));
                sx_out(bp, CD186x_IER, port->IER);
                spin_unlock_irqrestore(&bp->lock, flags);
                /*
                 * Before we drop DTR, make sure the UART transmitter
                 * has completely drained; this is especially
                 * important if there is a transmit FIFO!
                 */
                timeout = jiffies+HZ;
                while(port->IER & IER_TXEMPTY) {
                        set_current_state (TASK_INTERRUPTIBLE);
                        msleep_interruptible(jiffies_to_msecs(port->timeout));
                        if (time_after(jiffies, timeout)) {
                                printk (KERN_INFO "Timeout waiting for close\n");
                                break;
                        }
                }
 
        }
 
        if (--bp->count < 0) {
                printk(KERN_ERR "sx%d: sx_shutdown_port: bad board count: %d port: %d\n",
                       board_No(bp), bp->count, tty->index);
                bp->count = 0;
        }
        if (--port->count < 0) {
                printk(KERN_ERR "sx%d: sx_close: bad port count for tty%d: %d\n",
                       board_No(bp), port_No(port), port->count);
                port->count = 0;
        }
 
        sx_shutdown_port(bp, port);
        if (tty->driver->flush_buffer)
                tty->driver->flush_buffer(tty);
        tty_ldisc_flush(tty);
        spin_lock_irqsave(&port->lock, flags);
        tty->closing = 0;
        port->event = 0;
        port->tty = NULL;
        spin_unlock_irqrestore(&port->lock, flags);
        if (port->blocked_open) {
                if (port->close_delay) {
                        msleep_interruptible(jiffies_to_msecs(port->close_delay));
                }
                wake_up_interruptible(&port->open_wait);
        }
        port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
        wake_up_interruptible(&port->close_wait);
 
        func_exit();
}
 
 
static int sx_write(struct tty_struct * tty,
                    const unsigned char *buf, int count)
{
        struct specialix_port *port = (struct specialix_port *)tty->driver_data;
        struct specialix_board *bp;
        int c, total = 0;
        unsigned long flags;
 
        func_enter();
        if (sx_paranoia_check(port, tty->name, "sx_write")) {
                func_exit();
                return 0;
        }
 
        bp = port_Board(port);
 
        if (!port->xmit_buf) {
                func_exit();
                return 0;
        }
 
        while (1) {
                spin_lock_irqsave(&port->lock, flags);
                c = min_t(int, count, min(SERIAL_XMIT_SIZE - port->xmit_cnt - 1,
                                   SERIAL_XMIT_SIZE - port->xmit_head));
                if (c <= 0) {
                        spin_unlock_irqrestore(&port->lock, flags);
                        break;
                }
                memcpy(port->xmit_buf + port->xmit_head, buf, c);
                port->xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
                port->xmit_cnt += c;
                spin_unlock_irqrestore(&port->lock, flags);
 
                buf += c;
                count -= c;
                total += c;
        }
 
        spin_lock_irqsave(&bp->lock, flags);
        if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped &&
            !(port->IER & IER_TXRDY)) {
                port->IER |= IER_TXRDY;
                sx_out(bp, CD186x_CAR, port_No(port));
                sx_out(bp, CD186x_IER, port->IER);
        }
        spin_unlock_irqrestore(&bp->lock, flags);
        func_exit();
 
        return total;
}
 
 
static void sx_put_char(struct tty_struct * tty, unsigned char ch)
{
        struct specialix_port *port = (struct specialix_port *)tty->driver_data;
        unsigned long flags;
        struct specialix_board  * bp;
 
        func_enter();
 
        if (sx_paranoia_check(port, tty->name, "sx_put_char")) {
                func_exit();
                return;
        }
        dprintk (SX_DEBUG_TX, "check tty: %p %p\n", tty, port->xmit_buf);
        if (!port->xmit_buf) {
                func_exit();
                return;
        }
        bp = port_Board(port);
        spin_lock_irqsave(&port->lock, flags);
 
        dprintk (SX_DEBUG_TX, "xmit_cnt: %d xmit_buf: %p\n", port->xmit_cnt, port->xmit_buf);
        if ((port->xmit_cnt >= SERIAL_XMIT_SIZE - 1) || (!port->xmit_buf)) {
                spin_unlock_irqrestore(&port->lock, flags);
                dprintk (SX_DEBUG_TX, "Exit size\n");
                func_exit();
                return;
        }
        dprintk (SX_DEBUG_TX, "Handle xmit: %p %p\n", port, port->xmit_buf);
        port->xmit_buf[port->xmit_head++] = ch;
        port->xmit_head &= SERIAL_XMIT_SIZE - 1;
        port->xmit_cnt++;
        spin_unlock_irqrestore(&port->lock, flags);
 
        func_exit();
}
 
 
static void sx_flush_chars(struct tty_struct * tty)
{
        struct specialix_port *port = (struct specialix_port *)tty->driver_data;
        unsigned long flags;
        struct specialix_board  * bp = port_Board(port);
 
        func_enter();
 
        if (sx_paranoia_check(port, tty->name, "sx_flush_chars")) {
                func_exit();
                return;
        }
        if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
            !port->xmit_buf) {
                func_exit();
                return;
        }
        spin_lock_irqsave(&bp->lock, flags);
        port->IER |= IER_TXRDY;
        sx_out(port_Board(port), CD186x_CAR, port_No(port));
        sx_out(port_Board(port), CD186x_IER, port->IER);
        spin_unlock_irqrestore(&bp->lock, flags);
 
        func_exit();
}
 
 
static int sx_write_room(struct tty_struct * tty)
{
        struct specialix_port *port = (struct specialix_port *)tty->driver_data;
        int     ret;
 
        func_enter();
 
        if (sx_paranoia_check(port, tty->name, "sx_write_room")) {
                func_exit();
                return 0;
        }
 
        ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
        if (ret < 0)
                ret = 0;
 
        func_exit();
        return ret;
}
 
 
static int sx_chars_in_buffer(struct tty_struct *tty)
{
        struct specialix_port *port = (struct specialix_port *)tty->driver_data;
 
        func_enter();
 
        if (sx_paranoia_check(port, tty->name, "sx_chars_in_buffer")) {
                func_exit();
                return 0;
        }
        func_exit();
        return port->xmit_cnt;
}
 
 
static void sx_flush_buffer(struct tty_struct *tty)
{
        struct specialix_port *port = (struct specialix_port *)tty->driver_data;
        unsigned long flags;
        struct specialix_board  * bp;
 
        func_enter();
 
        if (sx_paranoia_check(port, tty->name, "sx_flush_buffer")) {
                func_exit();
                return;
        }
 
        bp = port_Board(port);
        spin_lock_irqsave(&port->lock, flags);
        port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
        spin_unlock_irqrestore(&port->lock, flags);
        tty_wakeup(tty);
 
        func_exit();
}
 
 
static int sx_tiocmget(struct tty_struct *tty, struct file *file)
{
        struct specialix_port *port = (struct specialix_port *)tty->driver_data;
        struct specialix_board * bp;
        unsigned char status;
        unsigned int result;
        unsigned long flags;
 
        func_enter();
 
        if (sx_paranoia_check(port, tty->name, __FUNCTION__)) {
                func_exit();
                return -ENODEV;
        }
 
        bp = port_Board(port);
        spin_lock_irqsave (&bp->lock, flags);
        sx_out(bp, CD186x_CAR, port_No(port));
        status = sx_in(bp, CD186x_MSVR);
        spin_unlock_irqrestore(&bp->lock, flags);
        dprintk (SX_DEBUG_INIT, "Got msvr[%d] = %02x, car = %d.\n",
                port_No(port), status, sx_in (bp, CD186x_CAR));
        dprintk (SX_DEBUG_INIT, "sx_port = %p, port = %p\n", sx_port, port);
        if (SX_CRTSCTS(port->tty)) {
                result  = /*   (status & MSVR_RTS) ? */ TIOCM_DTR /* : 0) */
                          |   ((status & MSVR_DTR) ? TIOCM_RTS : 0)
                          |   ((status & MSVR_CD)  ? TIOCM_CAR : 0)
                          |/* ((status & MSVR_DSR) ? */ TIOCM_DSR /* : 0) */
                          |   ((status & MSVR_CTS) ? TIOCM_CTS : 0);
        } else {
                result  = /*   (status & MSVR_RTS) ? */ TIOCM_RTS /* : 0) */
                          |   ((status & MSVR_DTR) ? TIOCM_DTR : 0)
                          |   ((status & MSVR_CD)  ? TIOCM_CAR : 0)
                          |/* ((status & MSVR_DSR) ? */ TIOCM_DSR /* : 0) */
                          |   ((status & MSVR_CTS) ? TIOCM_CTS : 0);
        }
 
        func_exit();
 
        return result;
}
 
 
static int sx_tiocmset(struct tty_struct *tty, struct file *file,
                       unsigned int set, unsigned int clear)
{
        struct specialix_port *port = (struct specialix_port *)tty->driver_data;
        unsigned long flags;
        struct specialix_board *bp;
 
        func_enter();
 
        if (sx_paranoia_check(port, tty->name, __FUNCTION__)) {
                func_exit();
                return -ENODEV;
        }
 
        bp = port_Board(port);
 
        spin_lock_irqsave(&port->lock, flags);
   /*   if (set & TIOCM_RTS)
                port->MSVR |= MSVR_RTS; */
   /*   if (set & TIOCM_DTR)
                port->MSVR |= MSVR_DTR; */
 
        if (SX_CRTSCTS(port->tty)) {
                if (set & TIOCM_RTS)
                        port->MSVR |= MSVR_DTR;
        } else {
                if (set & TIOCM_DTR)
                        port->MSVR |= MSVR_DTR;
        }
 
  /*    if (clear & TIOCM_RTS)
                port->MSVR &= ~MSVR_RTS; */
  /*    if (clear & TIOCM_DTR)
                port->MSVR &= ~MSVR_DTR; */
        if (SX_CRTSCTS(port->tty)) {
                if (clear & TIOCM_RTS)
                        port->MSVR &= ~MSVR_DTR;
        } else {
                if (clear & TIOCM_DTR)
                        port->MSVR &= ~MSVR_DTR;
        }
        spin_lock_irqsave(&bp->lock, flags);
        sx_out(bp, CD186x_CAR, port_No(port));
        sx_out(bp, CD186x_MSVR, port->MSVR);
        spin_unlock_irqrestore(&bp->lock, flags);
        spin_unlock_irqrestore(&port->lock, flags);
        func_exit();
        return 0;
}
 
 
static inline void sx_send_break(struct specialix_port * port, unsigned long length)
{
        struct specialix_board *bp = port_Board(port);
        unsigned long flags;
 
        func_enter();
 
        spin_lock_irqsave (&port->lock, flags);
        port->break_length = SPECIALIX_TPS / HZ * length;
        port->COR2 |= COR2_ETC;
        port->IER  |= IER_TXRDY;
        spin_lock_irqsave(&bp->lock, flags);
        sx_out(bp, CD186x_CAR, port_No(port));
        sx_out(bp, CD186x_COR2, port->COR2);
        sx_out(bp, CD186x_IER, port->IER);
        spin_unlock_irqrestore(&bp->lock, flags);
        spin_unlock_irqrestore (&port->lock, flags);
        sx_wait_CCR(bp);
        spin_lock_irqsave(&bp->lock, flags);
        sx_out(bp, CD186x_CCR, CCR_CORCHG2);
        spin_unlock_irqrestore(&bp->lock, flags);
        sx_wait_CCR(bp);
 
        func_exit();
}
 
 
static inline int sx_set_serial_info(struct specialix_port * port,
                                     struct serial_struct __user * newinfo)
{
        struct serial_struct tmp;
        struct specialix_board *bp = port_Board(port);
        int change_speed;
 
        func_enter();
        /*
        if (!access_ok(VERIFY_READ, (void *) newinfo, sizeof(tmp))) {
                func_exit();
                return -EFAULT;
        }
        */
        if (copy_from_user(&tmp, newinfo, sizeof(tmp))) {
                func_enter();
                return -EFAULT;
        }
 
#if 0
        if ((tmp.irq != bp->irq) ||
            (tmp.port != bp->base) ||
            (tmp.type != PORT_CIRRUS) ||
            (tmp.baud_base != (SX_OSCFREQ + CD186x_TPC/2) / CD186x_TPC) ||
            (tmp.custom_divisor != 0) ||
            (tmp.xmit_fifo_size != CD186x_NFIFO) ||
            (tmp.flags & ~SPECIALIX_LEGAL_FLAGS)) {
                func_exit();
                return -EINVAL;
        }
#endif
 
        change_speed = ((port->flags & ASYNC_SPD_MASK) !=
                        (tmp.flags & ASYNC_SPD_MASK));
        change_speed |= (tmp.custom_divisor != port->custom_divisor);
 
        if (!capable(CAP_SYS_ADMIN)) {
                if ((tmp.close_delay != port->close_delay) ||
                    (tmp.closing_wait != port->closing_wait) ||
                    ((tmp.flags & ~ASYNC_USR_MASK) !=
                     (port->flags & ~ASYNC_USR_MASK))) {
                        func_exit();
                        return -EPERM;
                }
                port->flags = ((port->flags & ~ASYNC_USR_MASK) |
                                  (tmp.flags & ASYNC_USR_MASK));
                port->custom_divisor = tmp.custom_divisor;
        } else {
                port->flags = ((port->flags & ~ASYNC_FLAGS) |
                                  (tmp.flags & ASYNC_FLAGS));
                port->close_delay = tmp.close_delay;
                port->closing_wait = tmp.closing_wait;
                port->custom_divisor = tmp.custom_divisor;
        }
        if (change_speed) {
                sx_change_speed(bp, port);
        }
        func_exit();
        return 0;
}
 
 
static inline int sx_get_serial_info(struct specialix_port * port,
                                     struct serial_struct __user *retinfo)
{
        struct serial_struct tmp;
        struct specialix_board *bp = port_Board(port);
 
        func_enter();
 
        /*
        if (!access_ok(VERIFY_WRITE, (void *) retinfo, sizeof(tmp)))
                return -EFAULT;
        */
 
        memset(&tmp, 0, sizeof(tmp));
        tmp.type = PORT_CIRRUS;
        tmp.line = port - sx_port;
        tmp.port = bp->base;
        tmp.irq  = bp->irq;
        tmp.flags = port->flags;
        tmp.baud_base = (SX_OSCFREQ + CD186x_TPC/2) / CD186x_TPC;
        tmp.close_delay = port->close_delay * HZ/100;
        tmp.closing_wait = port->closing_wait * HZ/100;
        tmp.custom_divisor =  port->custom_divisor;
        tmp.xmit_fifo_size = CD186x_NFIFO;
        if (copy_to_user(retinfo, &tmp, sizeof(tmp))) {
                func_exit();
                return -EFAULT;
        }
 
        func_exit();
        return 0;
}
 
 
static int sx_ioctl(struct tty_struct * tty, struct file * filp,
                    unsigned int cmd, unsigned long arg)
{
        struct specialix_port *port = (struct specialix_port *)tty->driver_data;
        int retval;
        void __user *argp = (void __user *)arg;
 
        func_enter();
 
        if (sx_paranoia_check(port, tty->name, "sx_ioctl")) {
                func_exit();
                return -ENODEV;
        }
 
        switch (cmd) {
         case TCSBRK:   /* SVID version: non-zero arg --> no break */
                retval = tty_check_change(tty);
                if (retval) {
                        func_exit();
                        return retval;
                }
                tty_wait_until_sent(tty, 0);
                if (!arg)
                        sx_send_break(port, HZ/4);      /* 1/4 second */
                return 0;
         case TCSBRKP:  /* support for POSIX tcsendbreak() */
                retval = tty_check_change(tty);
                if (retval) {
                        func_exit();
                        return retval;
                }
                tty_wait_until_sent(tty, 0);
                sx_send_break(port, arg ? arg*(HZ/10) : HZ/4);
                func_exit();
                return 0;
         case TIOCGSOFTCAR:
                 if (put_user(C_CLOCAL(tty)?1:0, (unsigned long __user *)argp)) {
                         func_exit();
                         return -EFAULT;
                 }
                 func_exit();
                return 0;
         case TIOCSSOFTCAR:
                 if (get_user(arg, (unsigned long __user *) argp)) {
                         func_exit();
                         return -EFAULT;
                 }
                tty->termios->c_cflag =
                        ((tty->termios->c_cflag & ~CLOCAL) |
                        (arg ? CLOCAL : 0));
                func_exit();
                return 0;
         case TIOCGSERIAL:
                 func_exit();
                return sx_get_serial_info(port, argp);
         case TIOCSSERIAL:
                 func_exit();
                return sx_set_serial_info(port, argp);
         default:
                 func_exit();
                return -ENOIOCTLCMD;
        }
        func_exit();
        return 0;
}
 
 
static void sx_throttle(struct tty_struct * tty)
{
        struct specialix_port *port = (struct specialix_port *)tty->driver_data;
        struct specialix_board *bp;
        unsigned long flags;
 
        func_enter();
 
        if (sx_paranoia_check(port, tty->name, "sx_throttle")) {
                func_exit();
                return;
        }
 
        bp = port_Board(port);
 
        /* Use DTR instead of RTS ! */
        if (SX_CRTSCTS (tty))
                port->MSVR &= ~MSVR_DTR;
        else {
                /* Auch!!! I think the system shouldn't call this then. */
                /* Or maybe we're supposed (allowed?) to do our side of hw
                   handshake anyway, even when hardware handshake is off.
                   When you see this in your logs, please report.... */
                printk (KERN_ERR "sx%d: Need to throttle, but can't (hardware hs is off)\n",
                         port_No (port));
        }
        spin_lock_irqsave(&bp->lock, flags);
        sx_out(bp, CD186x_CAR, port_No(port));
        spin_unlock_irqrestore(&bp->lock, flags);
        if (I_IXOFF(tty)) {
                spin_unlock_irqrestore(&bp->lock, flags);
                sx_wait_CCR(bp);
                spin_lock_irqsave(&bp->lock, flags);
                sx_out(bp, CD186x_CCR, CCR_SSCH2);
                spin_unlock_irqrestore(&bp->lock, flags);
                sx_wait_CCR(bp);
        }
        spin_lock_irqsave(&bp->lock, flags);
        sx_out(bp, CD186x_MSVR, port->MSVR);
        spin_unlock_irqrestore(&bp->lock, flags);
 
        func_exit();
}
 
 
static void sx_unthrottle(struct tty_struct * tty)
{
        struct specialix_port *port = (struct specialix_port *)tty->driver_data;
        struct specialix_board *bp;
        unsigned long flags;
 
        func_enter();
 
        if (sx_paranoia_check(port, tty->name, "sx_unthrottle")) {
                func_exit();
                return;
        }
 
        bp = port_Board(port);
 
        spin_lock_irqsave(&port->lock, flags);
        /* XXXX Use DTR INSTEAD???? */
        if (SX_CRTSCTS(tty)) {
                port->MSVR |= MSVR_DTR;
        } /* Else clause: see remark in "sx_throttle"... */
        spin_lock_irqsave(&bp->lock, flags);
        sx_out(bp, CD186x_CAR, port_No(port));
        spin_unlock_irqrestore(&bp->lock, flags);
        if (I_IXOFF(tty)) {
                spin_unlock_irqrestore(&port->lock, flags);
                sx_wait_CCR(bp);
                spin_lock_irqsave(&bp->lock, flags);
                sx_out(bp, CD186x_CCR, CCR_SSCH1);
                spin_unlock_irqrestore(&bp->lock, flags);
                sx_wait_CCR(bp);
                spin_lock_irqsave(&port->lock, flags);
        }
        spin_lock_irqsave(&bp->lock, flags);
        sx_out(bp, CD186x_MSVR, port->MSVR);
        spin_unlock_irqrestore(&bp->lock, flags);
        spin_unlock_irqrestore(&port->lock, flags);
 
        func_exit();
}
 
 
static void sx_stop(struct tty_struct * tty)
{
        struct specialix_port *port = (struct specialix_port *)tty->driver_data;
        struct specialix_board *bp;
        unsigned long flags;
 
        func_enter();
 
        if (sx_paranoia_check(port, tty->name, "sx_stop")) {
                func_exit();
                return;
        }
 
        bp = port_Board(port);
 
        spin_lock_irqsave(&port->lock, flags);
        port->IER &= ~IER_TXRDY;
        spin_lock_irqsave(&bp->lock, flags);
        sx_out(bp, CD186x_CAR, port_No(port));
        sx_out(bp, CD186x_IER, port->IER);
        spin_unlock_irqrestore(&bp->lock, flags);
        spin_unlock_irqrestore(&port->lock, flags);
 
        func_exit();
}
 
 
static void sx_start(struct tty_struct * tty)
{
        struct specialix_port *port = (struct specialix_port *)tty->driver_data;
        struct specialix_board *bp;
        unsigned long flags;
 
        func_enter();
 
        if (sx_paranoia_check(port, tty->name, "sx_start")) {
                func_exit();
                return;
        }
 
        bp = port_Board(port);
 
        spin_lock_irqsave(&port->lock, flags);
        if (port->xmit_cnt && port->xmit_buf && !(port->IER & IER_TXRDY)) {
                port->IER |= IER_TXRDY;
                spin_lock_irqsave(&bp->lock, flags);
                sx_out(bp, CD186x_CAR, port_No(port));
                sx_out(bp, CD186x_IER, port->IER);
                spin_unlock_irqrestore(&bp->lock, flags);
        }
        spin_unlock_irqrestore(&port->lock, flags);
 
        func_exit();
}
 
 
/*
 * This routine is called from the work-queue when the interrupt
 * routine has signalled that a hangup has occurred.  The path of
 * hangup processing is:
 *
 *      serial interrupt routine -> (workqueue) ->
 *      do_sx_hangup() -> tty->hangup() -> sx_hangup()
 *
 */
static void do_sx_hangup(struct work_struct *work)
{
        struct specialix_port   *port =
                container_of(work, struct specialix_port, tqueue_hangup);
        struct tty_struct       *tty;
 
        func_enter();
 
        tty = port->tty;
        if (tty)
                tty_hangup(tty);        /* FIXME: module removal race here */
 
        func_exit();
}
 
 
static void sx_hangup(struct tty_struct * tty)
{
        struct specialix_port *port = (struct specialix_port *)tty->driver_data;
        struct specialix_board *bp;
        unsigned long flags;
 
        func_enter();
 
        if (sx_paranoia_check(port, tty->name, "sx_hangup")) {
                func_exit();
                return;
        }
 
        bp = port_Board(port);
 
        sx_shutdown_port(bp, port);
        spin_lock_irqsave(&port->lock, flags);
        port->event = 0;
        bp->count -= port->count;
        if (bp->count < 0) {
                printk(KERN_ERR "sx%d: sx_hangup: bad board count: %d port: %d\n",
                        board_No(bp), bp->count, tty->index);
                bp->count = 0;
        }
        port->count = 0;
        port->flags &= ~ASYNC_NORMAL_ACTIVE;
        port->tty = NULL;
        spin_unlock_irqrestore(&port->lock, flags);
        wake_up_interruptible(&port->open_wait);
 
        func_exit();
}
 
 
static void sx_set_termios(struct tty_struct * tty, struct ktermios * old_termios)
{
        struct specialix_port *port = (struct specialix_port *)tty->driver_data;
        unsigned long flags;
        struct specialix_board  * bp;
 
        if (sx_paranoia_check(port, tty->name, "sx_set_termios"))
                return;
 
        if (tty->termios->c_cflag == old_termios->c_cflag &&
            tty->termios->c_iflag == old_termios->c_iflag)
                return;
 
        bp = port_Board(port);
        spin_lock_irqsave(&port->lock, flags);
        sx_change_speed(port_Board(port), port);
        spin_unlock_irqrestore(&port->lock, flags);
 
        if ((old_termios->c_cflag & CRTSCTS) &&
            !(tty->termios->c_cflag & CRTSCTS)) {
                tty->hw_stopped = 0;
                sx_start(tty);
        }
}
 
 
static void do_softint(struct work_struct *work)
{
        struct specialix_port   *port =
                container_of(work, struct specialix_port, tqueue);
        struct tty_struct       *tty;
 
        func_enter();
 
        if(!(tty = port->tty)) {
                func_exit();
                return;
        }
 
        if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &port->event))
                tty_wakeup(tty);
 
        func_exit();
}
 
static const struct tty_operations sx_ops = {
        .open  = sx_open,
        .close = sx_close,
        .write = sx_write,
        .put_char = sx_put_char,
        .flush_chars = sx_flush_chars,
        .write_room = sx_write_room,
        .chars_in_buffer = sx_chars_in_buffer,
        .flush_buffer = sx_flush_buffer,
        .ioctl = sx_ioctl,
        .throttle = sx_throttle,
        .unthrottle = sx_unthrottle,
        .set_termios = sx_set_termios,
        .stop = sx_stop,
        .start = sx_start,
        .hangup = sx_hangup,
        .tiocmget = sx_tiocmget,
        .tiocmset = sx_tiocmset,
};
 
static int sx_init_drivers(void)
{
        int error;
        int i;
 
        func_enter();
 
        specialix_driver = alloc_tty_driver(SX_NBOARD * SX_NPORT);
        if (!specialix_driver) {
                printk(KERN_ERR "sx: Couldn't allocate tty_driver.\n");
                func_exit();
                return 1;
        }
 
        specialix_driver->owner = THIS_MODULE;
        specialix_driver->name = "ttyW";
        specialix_driver->major = SPECIALIX_NORMAL_MAJOR;
        specialix_driver->type = TTY_DRIVER_TYPE_SERIAL;
        specialix_driver->subtype = SERIAL_TYPE_NORMAL;
        specialix_driver->init_termios = tty_std_termios;
        specialix_driver->init_termios.c_cflag =
                B9600 | CS8 | CREAD | HUPCL | CLOCAL;
        specialix_driver->init_termios.c_ispeed = 9600;
        specialix_driver->init_termios.c_ospeed = 9600;
        specialix_driver->flags = TTY_DRIVER_REAL_RAW;
        tty_set_operations(specialix_driver, &sx_ops);
 
        if ((error = tty_register_driver(specialix_driver))) {
                put_tty_driver(specialix_driver);
                printk(KERN_ERR "sx: Couldn't register specialix IO8+ driver, error = %d\n",
                       error);
                func_exit();
                return 1;
        }
        memset(sx_port, 0, sizeof(sx_port));
        for (i = 0; i < SX_NPORT * SX_NBOARD; i++) {
                sx_port[i].magic = SPECIALIX_MAGIC;
                INIT_WORK(&sx_port[i].tqueue, do_softint);
                INIT_WORK(&sx_port[i].tqueue_hangup, do_sx_hangup);
                sx_port[i].close_delay = 50 * HZ/100;
                sx_port[i].closing_wait = 3000 * HZ/100;
                init_waitqueue_head(&sx_port[i].open_wait);
                init_waitqueue_head(&sx_port[i].close_wait);
                spin_lock_init(&sx_port[i].lock);
        }
 
        func_exit();
        return 0;
}
 
static void sx_release_drivers(void)
{
        func_enter();
 
        tty_unregister_driver(specialix_driver);
        put_tty_driver(specialix_driver);
        func_exit();
}
 
/*
 * This routine must be called by kernel at boot time
 */
static int __init specialix_init(void)
{
        int i;
        int found = 0;
 
        func_enter();
 
        printk(KERN_INFO "sx: Specialix IO8+ driver v" VERSION ", (c) R.E.Wolff 1997/1998.\n");
        printk(KERN_INFO "sx: derived from work (c) D.Gorodchanin 1994-1996.\n");
#ifdef CONFIG_SPECIALIX_RTSCTS
        printk (KERN_INFO "sx: DTR/RTS pin is always RTS.\n");
#else
        printk (KERN_INFO "sx: DTR/RTS pin is RTS when CRTSCTS is on.\n");
#endif
 
        for (i = 0; i < SX_NBOARD; i++)
                spin_lock_init(&sx_board[i].lock);
 
        if (sx_init_drivers()) {
                func_exit();
                return -EIO;
        }
 
        for (i = 0; i < SX_NBOARD; i++)
                if (sx_board[i].base && !sx_probe(&sx_board[i]))
                        found++;
 
#ifdef CONFIG_PCI
        {
                struct pci_dev *pdev = NULL;
 
                i=0;
                while (i < SX_NBOARD) {
                        if (sx_board[i].flags & SX_BOARD_PRESENT) {
                                i++;
                                continue;
                        }
                        pdev = pci_get_device (PCI_VENDOR_ID_SPECIALIX,
                                                PCI_DEVICE_ID_SPECIALIX_IO8,
                                                pdev);
                        if (!pdev) break;
 
                        if (pci_enable_device(pdev))
                                continue;
 
                        sx_board[i].irq = pdev->irq;
 
                        sx_board[i].base = pci_resource_start (pdev, 2);
 
                        sx_board[i].flags |= SX_BOARD_IS_PCI;
                        if (!sx_probe(&sx_board[i]))
                                found ++;
                }
                /* May exit pci_get sequence early with lots of boards */
                if (pdev != NULL)
                        pci_dev_put(pdev);
        }
#endif
 
        if (!found) {
                sx_release_drivers();
                printk(KERN_INFO "sx: No specialix IO8+ boards detected.\n");
                func_exit();
                return -EIO;
        }
 
        func_exit();
        return 0;
}
 
static int iobase[SX_NBOARD]  = {0,};
 
static int irq [SX_NBOARD] = {0,};
 
module_param_array(iobase, int, NULL, 0);
module_param_array(irq, int, NULL, 0);
module_param(sx_debug, int, 0);
module_param(sx_rxfifo, int, 0);
#ifdef SPECIALIX_TIMER
module_param(sx_poll, int, 0);
#endif
 
/*
 * You can setup up to 4 boards.
 * by specifying "iobase=0xXXX,0xXXX ..." as insmod parameter.
 * You should specify the IRQs too in that case "irq=....,...".
 *
 * More than 4 boards in one computer is not possible, as the card can
 * only use 4 different interrupts.
 *
 */
static int __init specialix_init_module(void)
{
        int i;
 
        func_enter();
 
        if (iobase[0] || iobase[1] || iobase[2] || iobase[3]) {
                for(i = 0; i < SX_NBOARD; i++) {
                        sx_board[i].base = iobase[i];
                        sx_board[i].irq = irq[i];
                        sx_board[i].count= 0;
                }
        }
 
        func_exit();
 
        return specialix_init();
}
 
static void __exit specialix_exit_module(void)
{
        int i;
 
        func_enter();
 
        sx_release_drivers();
        for (i = 0; i < SX_NBOARD; i++)
                if (sx_board[i].flags & SX_BOARD_PRESENT)
                        sx_release_io_range(&sx_board[i]);
#ifdef SPECIALIX_TIMER
        del_timer_sync(&missed_irq_timer);
#endif
 
        func_exit();
}
 
static struct pci_device_id specialx_pci_tbl[] __devinitdata = {
        { PCI_DEVICE(PCI_VENDOR_ID_SPECIALIX, PCI_DEVICE_ID_SPECIALIX_IO8) },
        { }
};
MODULE_DEVICE_TABLE(pci, specialx_pci_tbl);
 
module_init(specialix_init_module);
module_exit(specialix_exit_module);
 
MODULE_LICENSE("GPL");
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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [char/] [specialix.c] - Blame information for rev 65

Line No.	Rev	Author	Line
1	62	marcus.erl	`/*`
2			`* specialix.c -- specialix IO8+ multiport serial driver.`
3			`*`
4			`* Copyright (C) 1997 Roger Wolff (R.E.Wolff@BitWizard.nl)`
5			`* Copyright (C) 1994-1996 Dmitry Gorodchanin (pgmdsg@ibi.com)`
6			`*`
7			`* Specialix pays for the development and support of this driver.`
8			`* Please DO contact io8-linux@specialix.co.uk if you require`
9			`* support. But please read the documentation (specialix.txt)`
10			`* first.`
11			`*`
12			`* This driver was developped in the BitWizard linux device`
13			`* driver service. If you require a linux device driver for your`
14			`* product, please contact devices@BitWizard.nl for a quote.`
15			`*`
16			`* This code is firmly based on the riscom/8 serial driver,`
17			`* written by Dmitry Gorodchanin. The specialix IO8+ card`
18			`* programming information was obtained from the CL-CD1865 Data`
19			`* Book, and Specialix document number 6200059: IO8+ Hardware`
20			`* Functional Specification.`
21			`*`
22			`* This program is free software; you can redistribute it and/or`
23			`* modify it under the terms of the GNU General Public License as`
24			`* published by the Free Software Foundation; either version 2 of`
25			`* the License, or (at your option) any later version.`
26			`*`
27			`* This program is distributed in the hope that it will be`
28			`* useful, but WITHOUT ANY WARRANTY; without even the implied`
29			`* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR`
30			`* PURPOSE. See the GNU General Public License for more details.`
31			`*`
32			`* You should have received a copy of the GNU General Public`
33			`* License along with this program; if not, write to the Free`
34			`* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,`
35			`* USA.`
36			`*`
37			`* Revision history:`
38			`*`
39			`* Revision 1.0: April 1st 1997.`
40			`* Initial release for alpha testing.`