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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [char/] [pcmcia/] [synclink_cs.c] - Blame information for rev 1275

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/*
 * linux/drivers/char/synclink_cs.c
 *
 * $Id: synclink_cs.c,v 1.1.1.1 2004-04-15 02:03:22 phoenix Exp $
 *
 * Device driver for Microgate SyncLink PC Card
 * multiprotocol serial adapter.
 *
 * written by Paul Fulghum for Microgate Corporation
 * paulkf@microgate.com
 *
 * Microgate and SyncLink are trademarks of Microgate Corporation
 *
 * This code is released under the GNU General Public License (GPL)
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
#if defined(__i386__)
#  define BREAKPOINT() asm("   int $3");
#else
#  define BREAKPOINT() { }
#endif
 
#define MAX_DEVICE_COUNT 4
 
#include <linux/config.h>       
#include <linux/module.h>
#include <linux/version.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <asm/serial.h>
#include <linux/delay.h>
#include <linux/ioctl.h>
 
#include <asm/system.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/dma.h>
#include <asm/bitops.h>
#include <asm/types.h>
#include <linux/termios.h>
#include <linux/tqueue.h>
 
#include <pcmcia/version.h>
#include <pcmcia/cs_types.h>
#include <pcmcia/cs.h>
#include <pcmcia/cistpl.h>
#include <pcmcia/cisreg.h>
#include <pcmcia/ds.h>
#include <pcmcia/bus_ops.h>
 
#ifdef CONFIG_SYNCLINK_SYNCPPP_MODULE
#define CONFIG_SYNCLINK_SYNCPPP 1
#endif
 
#ifdef CONFIG_SYNCLINK_SYNCPPP
#if LINUX_VERSION_CODE < VERSION(2,4,3) 
#include "../net/wan/syncppp.h"
#else
#include <net/syncppp.h>
#endif
#endif
 
#include <asm/segment.h>
#define GET_USER(error,value,addr) error = get_user(value,addr)
#define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
#define PUT_USER(error,value,addr) error = put_user(value,addr)
#define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
 
#include <asm/uaccess.h>
 
#include "linux/synclink.h"
 
static MGSL_PARAMS default_params = {
        MGSL_MODE_HDLC,                 /* unsigned long mode */
        0,                               /* unsigned char loopback; */
        HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
        HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
        0,                               /* unsigned long clock_speed; */
        0xff,                           /* unsigned char addr_filter; */
        HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
        HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
        HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
        9600,                           /* unsigned long data_rate; */
        8,                              /* unsigned char data_bits; */
        1,                              /* unsigned char stop_bits; */
        ASYNC_PARITY_NONE               /* unsigned char parity; */
};
 
typedef struct
{
        int count;
        unsigned char status;
        char data[1];
} RXBUF;
 
/* The queue of BH actions to be performed */
 
#define BH_RECEIVE  1
#define BH_TRANSMIT 2
#define BH_STATUS   4
 
#define IO_PIN_SHUTDOWN_LIMIT 100
 
#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
 
struct _input_signal_events {
        int     ri_up;
        int     ri_down;
        int     dsr_up;
        int     dsr_down;
        int     dcd_up;
        int     dcd_down;
        int     cts_up;
        int     cts_down;
};
 
 
/*
 * Device instance data structure
 */
 
typedef struct _mgslpc_info {
        void *if_ptr;   /* General purpose pointer (used by SPPP) */
        int                     magic;
        int                     flags;
        int                     count;          /* count of opens */
        int                     line;
        unsigned short          close_delay;
        unsigned short          closing_wait;   /* time to wait before closing */
 
        struct mgsl_icount      icount;
 
        struct termios          normal_termios;
        struct termios          callout_termios;
 
        struct tty_struct       *tty;
        int                     timeout;
        int                     x_char;         /* xon/xoff character */
        int                     blocked_open;   /* # of blocked opens */
        long                    session;        /* Session of opening process */
        long                    pgrp;           /* pgrp of opening process */
        unsigned char           read_status_mask;
        unsigned char           ignore_status_mask;
 
        unsigned char *tx_buf;
        int            tx_put;
        int            tx_get;
        int            tx_count;
 
        /* circular list of fixed length rx buffers */
 
        unsigned char  *rx_buf;        /* memory allocated for all rx buffers */
        int            rx_buf_total_size; /* size of memory allocated for rx buffers */
        int            rx_put;         /* index of next empty rx buffer */
        int            rx_get;         /* index of next full rx buffer */
        int            rx_buf_size;    /* size in bytes of single rx buffer */
        int            rx_buf_count;   /* total number of rx buffers */
        int            rx_frame_count; /* number of full rx buffers */
 
        wait_queue_head_t       open_wait;
        wait_queue_head_t       close_wait;
 
        wait_queue_head_t       status_event_wait_q;
        wait_queue_head_t       event_wait_q;
        struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
        struct _mgslpc_info     *next_device;   /* device list link */
 
        unsigned short imra_value;
        unsigned short imrb_value;
        unsigned char  pim_value;
 
        spinlock_t lock;
        struct tq_struct task;          /* task structure for scheduling bh */
 
        u32 max_frame_size;
 
        u32 pending_bh;
 
        int bh_running;
        int bh_requested;
 
        int dcd_chkcount; /* check counts to prevent */
        int cts_chkcount; /* too many IRQs if a signal */
        int dsr_chkcount; /* is floating */
        int ri_chkcount;
 
        int rx_enabled;
        int rx_overflow;
 
        int tx_enabled;
        int tx_active;
        int tx_aborting;
        u32 idle_mode;
 
        int if_mode; /* serial interface selection (RS-232, v.35 etc) */
 
        char device_name[25];           /* device instance name */
 
        unsigned int io_base;   /* base I/O address of adapter */
        unsigned int irq_level;
 
        MGSL_PARAMS params;             /* communications parameters */
 
        unsigned char serial_signals;   /* current serial signal states */
 
        char irq_occurred;              /* for diagnostics use */
        char testing_irq;
        unsigned int init_error;        /* startup error (DIAGS)        */
 
        char flag_buf[MAX_ASYNC_BUFFER_SIZE];
        BOOLEAN drop_rts_on_tx_done;
 
        struct  _input_signal_events    input_signal_events;
 
        /* PCMCIA support */
        dev_link_t            link;
        dev_node_t            node;
        int                   stop;
        struct bus_operations *bus;
 
        /* SPPP/Cisco HDLC device parts */
        int netcount;
        int dosyncppp;
        spinlock_t netlock;
#ifdef CONFIG_SYNCLINK_SYNCPPP
        struct ppp_device pppdev;
        char netname[10];
        struct net_device *netdev;
        struct net_device_stats netstats;
        struct net_device netdevice;
#endif
} MGSLPC_INFO;
 
#define MGSLPC_MAGIC 0x5402
 
/*
 * The size of the serial xmit buffer is 1 page, or 4096 bytes
 */
#define TXBUFSIZE 4096
 
 
#define CHA     0x00   /* channel A offset */
#define CHB     0x40   /* channel B offset */
 
#define RXFIFO  0
#define TXFIFO  0
#define STAR    0x20
#define CMDR    0x20
#define RSTA    0x21
#define PRE     0x21
#define MODE    0x22
#define TIMR    0x23
#define XAD1    0x24
#define XAD2    0x25
#define RAH1    0x26
#define RAH2    0x27
#define DAFO    0x27
#define RAL1    0x28
#define RFC     0x28
#define RHCR    0x29
#define RAL2    0x29
#define RBCL    0x2a
#define XBCL    0x2a
#define RBCH    0x2b
#define XBCH    0x2b
#define CCR0    0x2c
#define CCR1    0x2d
#define CCR2    0x2e
#define CCR3    0x2f
#define VSTR    0x34
#define BGR     0x34
#define RLCR    0x35
#define AML     0x36
#define AMH     0x37
#define GIS     0x38
#define IVA     0x38
#define IPC     0x39
#define ISR     0x3a
#define IMR     0x3a
#define PVR     0x3c
#define PIS     0x3d
#define PIM     0x3d
#define PCR     0x3e
#define CCR4    0x3f
 
// IMR/ISR
 
#define IRQ_BREAK_ON    BIT15   // rx break detected
#define IRQ_DATAOVERRUN BIT14   // receive data overflow
#define IRQ_ALLSENT     BIT13   // all sent
#define IRQ_UNDERRUN    BIT12   // transmit data underrun
#define IRQ_TIMER       BIT11   // timer interrupt
#define IRQ_CTS         BIT10   // CTS status change
#define IRQ_TXREPEAT    BIT9    // tx message repeat
#define IRQ_TXFIFO      BIT8    // transmit pool ready
#define IRQ_RXEOM       BIT7    // receive message end
#define IRQ_EXITHUNT    BIT6    // receive frame start
#define IRQ_RXTIME      BIT6    // rx char timeout
#define IRQ_DCD         BIT2    // carrier detect status change
#define IRQ_OVERRUN     BIT1    // receive frame overflow
#define IRQ_RXFIFO      BIT0    // receive pool full
 
// STAR
 
#define XFW   BIT6              // transmit FIFO write enable
#define CEC   BIT2              // command executing
#define CTS   BIT1              // CTS state
 
#define PVR_DTR      BIT0
#define PVR_DSR      BIT1
#define PVR_RI       BIT2
#define PVR_AUTOCTS  BIT3
#define PVR_RS232    0x20   /* 0010b */
#define PVR_V35      0xe0   /* 1110b */
#define PVR_RS422    0x40   /* 0100b */
 
/* Register access functions */
 
#define write_reg(info, reg, val) outb((val),(info)->io_base + (reg))
#define read_reg(info, reg) inb((info)->io_base + (reg))
 
#define read_reg16(info, reg) inw((info)->io_base + (reg))  
#define write_reg16(info, reg, val) outw((val), (info)->io_base + (reg))
 
#define set_reg_bits(info, reg, mask) \
    write_reg(info, (reg), \
                 (unsigned char) (read_reg(info, (reg)) | (mask)))
#define clear_reg_bits(info, reg, mask) \
    write_reg(info, (reg), \
                 (unsigned char) (read_reg(info, (reg)) & ~(mask)))
/*
 * interrupt enable/disable routines
 */
static void irq_disable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
{
        if (channel == CHA) {
                info->imra_value |= mask;
                write_reg16(info, CHA + IMR, info->imra_value);
        } else {
                info->imrb_value |= mask;
                write_reg16(info, CHB + IMR, info->imrb_value);
        }
}
static void irq_enable(MGSLPC_INFO *info, unsigned char channel, unsigned short mask)
{
        if (channel == CHA) {
                info->imra_value &= ~mask;
                write_reg16(info, CHA + IMR, info->imra_value);
        } else {
                info->imrb_value &= ~mask;
                write_reg16(info, CHB + IMR, info->imrb_value);
        }
}
 
#define port_irq_disable(info, mask) \
  { info->pim_value |= (mask); write_reg(info, PIM, info->pim_value); }
 
#define port_irq_enable(info, mask) \
  { info->pim_value &= ~(mask); write_reg(info, PIM, info->pim_value); }
 
static void rx_start(MGSLPC_INFO *info);
static void rx_stop(MGSLPC_INFO *info);
 
static void tx_start(MGSLPC_INFO *info);
static void tx_stop(MGSLPC_INFO *info);
static void tx_set_idle(MGSLPC_INFO *info);
 
static void get_signals(MGSLPC_INFO *info);
static void set_signals(MGSLPC_INFO *info);
 
static void reset_device(MGSLPC_INFO *info);
 
static void hdlc_mode(MGSLPC_INFO *info);
static void async_mode(MGSLPC_INFO *info);
 
static void tx_timeout(unsigned long context);
 
static int ioctl_common(MGSLPC_INFO *info, unsigned int cmd, unsigned long arg);
 
#ifdef CONFIG_SYNCLINK_SYNCPPP
/* SPPP/HDLC stuff */
static void mgslpc_sppp_init(MGSLPC_INFO *info);
static void mgslpc_sppp_delete(MGSLPC_INFO *info);
static int  mgslpc_sppp_open(struct net_device *d);
static int  mgslpc_sppp_close(struct net_device *d);
static void mgslpc_sppp_tx_timeout(struct net_device *d);
static int  mgslpc_sppp_tx(struct sk_buff *skb, struct net_device *d);
static void mgslpc_sppp_rx_done(MGSLPC_INFO *info, char *buf, int size);
static void mgslpc_sppp_tx_done(MGSLPC_INFO *info);
static int  mgslpc_sppp_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
struct net_device_stats *mgslpc_net_stats(struct net_device *dev);
#endif
 
static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit);
 
static BOOLEAN register_test(MGSLPC_INFO *info);
static BOOLEAN irq_test(MGSLPC_INFO *info);
static int adapter_test(MGSLPC_INFO *info);
 
static int claim_resources(MGSLPC_INFO *info);
static void release_resources(MGSLPC_INFO *info);
static void mgslpc_add_device(MGSLPC_INFO *info);
static void mgslpc_remove_device(MGSLPC_INFO *info);
 
static int  rx_get_frame(MGSLPC_INFO *info);
static void rx_reset_buffers(MGSLPC_INFO *info);
static int  rx_alloc_buffers(MGSLPC_INFO *info);
static void rx_free_buffers(MGSLPC_INFO *info);
 
static void mgslpc_isr(int irq, void *dev_id, struct pt_regs * regs);
 
/*
 * Bottom half interrupt handlers
 */
static void bh_handler(void* Context);
static void bh_transmit(MGSLPC_INFO *info);
static void bh_status(MGSLPC_INFO *info);
 
/*
 * ioctl handlers
 */
static int set_modem_info(MGSLPC_INFO *info, unsigned int cmd,
                          unsigned int *value);
static int get_modem_info(MGSLPC_INFO *info, unsigned int *value);
static int get_stats(MGSLPC_INFO *info, struct mgsl_icount *user_icount);
static int get_params(MGSLPC_INFO *info, MGSL_PARAMS *user_params);
static int set_params(MGSLPC_INFO *info, MGSL_PARAMS *new_params);
static int get_txidle(MGSLPC_INFO *info, int*idle_mode);
static int set_txidle(MGSLPC_INFO *info, int idle_mode);
static int set_txenable(MGSLPC_INFO *info, int enable);
static int tx_abort(MGSLPC_INFO *info);
static int set_rxenable(MGSLPC_INFO *info, int enable);
static int wait_events(MGSLPC_INFO *info, int *mask);
 
#define jiffies_from_ms(a) ((((a) * HZ)/1000)+1)
 
static MGSLPC_INFO *mgslpc_device_list = NULL;
static int mgslpc_device_count = 0;
 
/*
 * Set this param to non-zero to load eax with the
 * .text section address and breakpoint on module load.
 * This is useful for use with gdb and add-symbol-file command.
 */
static int break_on_load=0;
 
/*
 * Driver major number, defaults to zero to get auto
 * assigned major number. May be forced as module parameter.
 */
static int ttymajor=0;
static int cuamajor=0;
 
static int debug_level = 0;
static int maxframe[MAX_DEVICE_COUNT] = {0,};
static int dosyncppp[MAX_DEVICE_COUNT] = {1,1,1,1};
 
/* The old way: bit map of interrupts to choose from */
/* This means pick from 15, 14, 12, 11, 10, 9, 7, 5, 4, and 3 */
static u_int irq_mask = 0xdeb8;
 
/* Newer, simpler way of listing specific interrupts */
static int irq_list[4] = { -1 };
 
MODULE_PARM(irq_mask, "i");
MODULE_PARM(irq_list, "1-4i");
 
MODULE_PARM(break_on_load,"i");
MODULE_PARM(ttymajor,"i");
MODULE_PARM(cuamajor,"i");
MODULE_PARM(debug_level,"i");
MODULE_PARM(maxframe,"1-" __MODULE_STRING(MAX_DEVICE_COUNT) "i");
MODULE_PARM(dosyncppp,"1-" __MODULE_STRING(MAX_DEVICE_COUNT) "i");
 
#ifdef MODULE_LICENSE
MODULE_LICENSE("GPL");
#endif
 
static char *driver_name = "SyncLink PC Card driver";
static char *driver_version = "$Revision: 1.1.1.1 $";
 
static struct tty_driver serial_driver, callout_driver;
static int serial_refcount;
 
/* number of characters left in xmit buffer before we ask for more */
#define WAKEUP_CHARS 256
 
static void mgslpc_change_params(MGSLPC_INFO *info);
static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout);
 
static struct tty_struct *serial_table[MAX_DEVICE_COUNT];
static struct termios *serial_termios[MAX_DEVICE_COUNT];
static struct termios *serial_termios_locked[MAX_DEVICE_COUNT];
 
#ifndef MIN
#define MIN(a,b)        ((a) < (b) ? (a) : (b))
#endif
 
/* PCMCIA prototypes */
 
static void mgslpc_config(dev_link_t *link);
static void mgslpc_release(u_long arg);
static int  mgslpc_event(event_t event, int priority,
                         event_callback_args_t *args);
static dev_link_t *mgslpc_attach(void);
static void mgslpc_detach(dev_link_t *);
 
static dev_info_t dev_info = "synclink_cs";
static dev_link_t *dev_list = NULL;
 
static void cs_error(client_handle_t handle, int func, int ret)
{
    error_info_t err = { func, ret };
    CardServices(ReportError, handle, &err);
}
 
/*
 * 1st function defined in .text section. Calling this function in
 * init_module() followed by a breakpoint allows a remote debugger
 * (gdb) to get the .text address for the add-symbol-file command.
 * This allows remote debugging of dynamically loadable modules.
 */
static void* mgslpc_get_text_ptr(void);
static void* mgslpc_get_text_ptr() {return mgslpc_get_text_ptr;}
 
static dev_link_t *mgslpc_attach(void)
{
    MGSLPC_INFO *info;
    dev_link_t *link;
    client_reg_t client_reg;
    int ret, i;
 
    if (debug_level >= DEBUG_LEVEL_INFO)
            printk("mgslpc_attach\n");
 
    info = (MGSLPC_INFO *)kmalloc(sizeof(MGSLPC_INFO), GFP_KERNEL);
    if (!info) {
            printk("Error can't allocate device instance data\n");
            return NULL;
    }
 
    memset(info, 0, sizeof(MGSLPC_INFO));
    info->magic = MGSLPC_MAGIC;
    info->task.sync = 0;
    info->task.routine = bh_handler;
    info->task.data    = info;
    info->max_frame_size = 4096;
    info->close_delay = 5*HZ/10;
    info->closing_wait = 30*HZ;
    init_waitqueue_head(&info->open_wait);
    init_waitqueue_head(&info->close_wait);
    init_waitqueue_head(&info->status_event_wait_q);
    init_waitqueue_head(&info->event_wait_q);
    spin_lock_init(&info->lock);
    spin_lock_init(&info->netlock);
    memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
    info->idle_mode = HDLC_TXIDLE_FLAGS;
    info->imra_value = 0xffff;
    info->imrb_value = 0xffff;
    info->pim_value = 0xff;
 
    link = &info->link;
    link->priv = info;
 
    /* Initialize the dev_link_t structure */
    link->release.function = &mgslpc_release;
    link->release.data = (u_long)link;
 
    /* Interrupt setup */
    link->irq.Attributes = IRQ_TYPE_EXCLUSIVE;
    link->irq.IRQInfo1   = IRQ_INFO2_VALID | IRQ_LEVEL_ID;
    if (irq_list[0] == -1)
            link->irq.IRQInfo2 = irq_mask;
    else
            for (i = 0; i < 4; i++)
                    link->irq.IRQInfo2 |= 1 << irq_list[i];
    link->irq.Handler = NULL;
 
    link->conf.Attributes = 0;
    link->conf.Vcc = 50;
    link->conf.IntType = INT_MEMORY_AND_IO;
 
    /* Register with Card Services */
    link->next = dev_list;
    dev_list = link;
 
    client_reg.dev_info = &dev_info;
    client_reg.Attributes = INFO_IO_CLIENT | INFO_CARD_SHARE;
    client_reg.EventMask =
            CS_EVENT_CARD_INSERTION | CS_EVENT_CARD_REMOVAL |
            CS_EVENT_RESET_PHYSICAL | CS_EVENT_CARD_RESET |
            CS_EVENT_PM_SUSPEND | CS_EVENT_PM_RESUME;
    client_reg.event_handler = &mgslpc_event;
    client_reg.Version = 0x0210;
    client_reg.event_callback_args.client_data = link;
 
    ret = CardServices(RegisterClient, &link->handle, &client_reg);
    if (ret != CS_SUCCESS) {
            cs_error(link->handle, RegisterClient, ret);
            mgslpc_detach(link);
            return NULL;
    }
 
    mgslpc_add_device(info);
 
    memset(serial_table,0,sizeof(struct tty_struct*)*MAX_DEVICE_COUNT);
    memset(serial_termios,0,sizeof(struct termios*)*MAX_DEVICE_COUNT);
    memset(serial_termios_locked,0,sizeof(struct termios*)*MAX_DEVICE_COUNT);
 
    info->callout_termios = callout_driver.init_termios;
    info->normal_termios  = serial_driver.init_termios;
 
    return link;
}
 
/* Card has been inserted.
 */
 
#define CS_CHECK(fn, args...) \
while ((last_ret=CardServices(last_fn=(fn),args))!=0) goto cs_failed
 
static void mgslpc_config(dev_link_t *link)
{
    client_handle_t handle = link->handle;
    MGSLPC_INFO *info = link->priv;
    tuple_t tuple;
    cisparse_t parse;
    int last_fn, last_ret;
    u_char buf[64];
    config_info_t conf;
    cistpl_cftable_entry_t dflt = { 0 };
    cistpl_cftable_entry_t *cfg;
 
    if (debug_level >= DEBUG_LEVEL_INFO)
            printk("mgslpc_config(0x%p)\n", link);
 
    /* read CONFIG tuple to find its configuration registers */
    tuple.DesiredTuple = CISTPL_CONFIG;
    tuple.Attributes = 0;
    tuple.TupleData = buf;
    tuple.TupleDataMax = sizeof(buf);
    tuple.TupleOffset = 0;
    CS_CHECK(GetFirstTuple, handle, &tuple);
    CS_CHECK(GetTupleData, handle, &tuple);
    CS_CHECK(ParseTuple, handle, &tuple, &parse);
    link->conf.ConfigBase = parse.config.base;
    link->conf.Present = parse.config.rmask[0];
 
    /* Configure card */
    link->state |= DEV_CONFIG;
 
    /* Look up the current Vcc */
    CS_CHECK(GetConfigurationInfo, handle, &conf);
    link->conf.Vcc = conf.Vcc;
 
    /* get CIS configuration entry */
 
    tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
    CS_CHECK(GetFirstTuple, handle, &tuple);
 
    cfg = &(parse.cftable_entry);
    CS_CHECK(GetTupleData, handle, &tuple);
    CS_CHECK(ParseTuple, handle, &tuple, &parse);
 
    if (cfg->flags & CISTPL_CFTABLE_DEFAULT) dflt = *cfg;
    if (cfg->index == 0)
            goto cs_failed;
 
    link->conf.ConfigIndex = cfg->index;
    link->conf.Attributes |= CONF_ENABLE_IRQ;
 
    /* IO window settings */
    link->io.NumPorts1 = 0;
    if ((cfg->io.nwin > 0) || (dflt.io.nwin > 0)) {
            cistpl_io_t *io = (cfg->io.nwin) ? &cfg->io : &dflt.io;
            link->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO;
            if (!(io->flags & CISTPL_IO_8BIT))
                    link->io.Attributes1 = IO_DATA_PATH_WIDTH_16;
            if (!(io->flags & CISTPL_IO_16BIT))
                    link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
            link->io.IOAddrLines = io->flags & CISTPL_IO_LINES_MASK;
            link->io.BasePort1 = io->win[0].base;
            link->io.NumPorts1 = io->win[0].len;
            CS_CHECK(RequestIO, link->handle, &link->io);
    }
 
    link->conf.Attributes = CONF_ENABLE_IRQ;
    link->conf.Vcc = 50;
    link->conf.IntType = INT_MEMORY_AND_IO;
    link->conf.ConfigIndex = 8;
    link->conf.Present = PRESENT_OPTION;
 
    link->irq.Attributes |= IRQ_HANDLE_PRESENT;
    link->irq.Handler     = mgslpc_isr;
    link->irq.Instance    = info;
    CS_CHECK(RequestIRQ, link->handle, &link->irq);
 
    CS_CHECK(RequestConfiguration, link->handle, &link->conf);
 
    info->io_base = link->io.BasePort1;
    info->irq_level = link->irq.AssignedIRQ;
 
    /* add to linked list of devices */
    sprintf(info->node.dev_name, "mgslpc0");
    info->node.major = info->node.minor = 0;
    link->dev = &info->node;
 
    printk(KERN_INFO "%s: index 0x%02x:",
           info->node.dev_name, link->conf.ConfigIndex);
    if (link->conf.Attributes & CONF_ENABLE_IRQ)
            printk(", irq %d", link->irq.AssignedIRQ);
    if (link->io.NumPorts1)
            printk(", io 0x%04x-0x%04x", link->io.BasePort1,
                   link->io.BasePort1+link->io.NumPorts1-1);
    printk("\n");
 
    link->state &= ~DEV_CONFIG_PENDING;
    return;
 
cs_failed:
    cs_error(link->handle, last_fn, last_ret);
    mgslpc_release((u_long)link);
}
 
/* Card has been removed.
 * Unregister device and release PCMCIA configuration.
 * If device is open, postpone until it is closed.
 */
static void mgslpc_release(u_long arg)
{
    dev_link_t *link = (dev_link_t *)arg;
 
    if (debug_level >= DEBUG_LEVEL_INFO)
            printk("mgslpc_release(0x%p)\n", link);
 
    if (link->open) {
            if (debug_level >= DEBUG_LEVEL_INFO)
                    printk("synclink_cs: release postponed, '%s' still open\n",
                           link->dev->dev_name);
            link->state |= DEV_STALE_CONFIG;
            return;
    }
 
    /* Unlink the device chain */
    link->dev = NULL;
    link->state &= ~DEV_CONFIG;
 
    CardServices(ReleaseConfiguration, link->handle);
    if (link->io.NumPorts1)
            CardServices(ReleaseIO, link->handle, &link->io);
    if (link->irq.AssignedIRQ)
            CardServices(ReleaseIRQ, link->handle, &link->irq);
    if (link->state & DEV_STALE_LINK)
            mgslpc_detach(link);
}
 
static void mgslpc_detach(dev_link_t *link)
{
    dev_link_t **linkp;
 
    if (debug_level >= DEBUG_LEVEL_INFO)
            printk("mgslpc_detach(0x%p)\n", link);
 
    /* find device */
    for (linkp = &dev_list; *linkp; linkp = &(*linkp)->next)
            if (*linkp == link) break;
    if (*linkp == NULL)
            return;
 
    if (link->state & DEV_CONFIG) {
            /* device is configured/active, mark it so when
             * release() is called a proper detach() occurs.
             */
            if (debug_level >= DEBUG_LEVEL_INFO)
                    printk(KERN_DEBUG "synclinkpc: detach postponed, '%s' "
                           "still locked\n", link->dev->dev_name);
            link->state |= DEV_STALE_LINK;
            return;
    }
 
    /* Break the link with Card Services */
    if (link->handle)
            CardServices(DeregisterClient, link->handle);
 
    /* Unlink device structure, and free it */
    *linkp = link->next;
    mgslpc_remove_device((MGSLPC_INFO *)link->priv);
}
 
static int mgslpc_event(event_t event, int priority,
                        event_callback_args_t *args)
{
    dev_link_t *link = args->client_data;
    MGSLPC_INFO *info = link->priv;
 
    if (debug_level >= DEBUG_LEVEL_INFO)
            printk("mgslpc_event(0x%06x)\n", event);
 
    switch (event) {
    case CS_EVENT_CARD_REMOVAL:
            link->state &= ~DEV_PRESENT;
            if (link->state & DEV_CONFIG) {
                    ((MGSLPC_INFO *)link->priv)->stop = 1;
                    mod_timer(&link->release, jiffies + HZ/20);
            }
            break;
    case CS_EVENT_CARD_INSERTION:
            link->state |= DEV_PRESENT | DEV_CONFIG_PENDING;
            info->bus = args->bus;
            mgslpc_config(link);
            break;
    case CS_EVENT_PM_SUSPEND:
            link->state |= DEV_SUSPEND;
            /* Fall through... */
    case CS_EVENT_RESET_PHYSICAL:
            /* Mark the device as stopped, to block IO until later */
            info->stop = 1;
            if (link->state & DEV_CONFIG)
                    CardServices(ReleaseConfiguration, link->handle);
            break;
    case CS_EVENT_PM_RESUME:
            link->state &= ~DEV_SUSPEND;
            /* Fall through... */
    case CS_EVENT_CARD_RESET:
            if (link->state & DEV_CONFIG)
                    CardServices(RequestConfiguration, link->handle, &link->conf);
            info->stop = 0;
            break;
    }
    return 0;
}
 
static inline int mgslpc_paranoia_check(MGSLPC_INFO *info,
                                        kdev_t device, const char *routine)
{
#ifdef MGSLPC_PARANOIA_CHECK
        static const char *badmagic =
                "Warning: bad magic number for mgsl struct (%s) in %s\n";
        static const char *badinfo =
                "Warning: null mgslpc_info for (%s) in %s\n";
 
        if (!info) {
                printk(badinfo, kdevname(device), routine);
                return 1;
        }
        if (info->magic != MGSLPC_MAGIC) {
                printk(badmagic, kdevname(device), routine);
                return 1;
        }
#else
        if (!info)
                return 1;
#endif
        return 0;
}
 
 
#define CMD_RXFIFO      BIT7    // release current rx FIFO
#define CMD_RXRESET     BIT6    // receiver reset
#define CMD_RXFIFO_READ BIT5
#define CMD_START_TIMER BIT4
#define CMD_TXFIFO      BIT3    // release current tx FIFO
#define CMD_TXEOM       BIT1    // transmit end message
#define CMD_TXRESET     BIT0    // transmit reset
 
static BOOLEAN wait_command_complete(MGSLPC_INFO *info, unsigned char channel)
{
        int i = 0;
        unsigned char status;
        /* wait for command completion */
        while ((status = read_reg(info, (unsigned char)(channel+STAR)) & BIT2)) {
                udelay(1);
                if (i++ == 1000)
                        return FALSE;
        }
        return TRUE;
}
 
static void issue_command(MGSLPC_INFO *info, unsigned char channel, unsigned char cmd)
{
        wait_command_complete(info, channel);
        write_reg(info, (unsigned char) (channel + CMDR), cmd);
}
 
static void tx_pause(struct tty_struct *tty)
{
        MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
        unsigned long flags;
 
        if (mgslpc_paranoia_check(info, tty->device, "tx_pause"))
                return;
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("tx_pause(%s)\n",info->device_name);
 
        spin_lock_irqsave(&info->lock,flags);
        if (info->tx_enabled)
                tx_stop(info);
        spin_unlock_irqrestore(&info->lock,flags);
}
 
static void tx_release(struct tty_struct *tty)
{
        MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
        unsigned long flags;
 
        if (mgslpc_paranoia_check(info, tty->device, "tx_release"))
                return;
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("tx_release(%s)\n",info->device_name);
 
        spin_lock_irqsave(&info->lock,flags);
        if (!info->tx_enabled)
                tx_start(info);
        spin_unlock_irqrestore(&info->lock,flags);
}
 
/* Return next bottom half action to perform.
 * or 0 if nothing to do.
 */
int bh_action(MGSLPC_INFO *info)
{
        unsigned long flags;
        int rc = 0;
 
        spin_lock_irqsave(&info->lock,flags);
 
        if (info->pending_bh & BH_RECEIVE) {
                info->pending_bh &= ~BH_RECEIVE;
                rc = BH_RECEIVE;
        } else if (info->pending_bh & BH_TRANSMIT) {
                info->pending_bh &= ~BH_TRANSMIT;
                rc = BH_TRANSMIT;
        } else if (info->pending_bh & BH_STATUS) {
                info->pending_bh &= ~BH_STATUS;
                rc = BH_STATUS;
        }
 
        if (!rc) {
                /* Mark BH routine as complete */
                info->bh_running   = 0;
                info->bh_requested = 0;
        }
 
        spin_unlock_irqrestore(&info->lock,flags);
 
        return rc;
}
 
void bh_handler(void* Context)
{
        MGSLPC_INFO *info = (MGSLPC_INFO*)Context;
        int action;
 
        if (!info)
                return;
 
        if (debug_level >= DEBUG_LEVEL_BH)
                printk( "%s(%d):bh_handler(%s) entry\n",
                        __FILE__,__LINE__,info->device_name);
 
        info->bh_running = 1;
 
        while((action = bh_action(info)) != 0) {
 
                /* Process work item */
                if ( debug_level >= DEBUG_LEVEL_BH )
                        printk( "%s(%d):bh_handler() work item action=%d\n",
                                __FILE__,__LINE__,action);
 
                switch (action) {
 
                case BH_RECEIVE:
                        while(rx_get_frame(info));
                        break;
                case BH_TRANSMIT:
                        bh_transmit(info);
                        break;
                case BH_STATUS:
                        bh_status(info);
                        break;
                default:
                        /* unknown work item ID */
                        printk("Unknown work item ID=%08X!\n", action);
                        break;
                }
        }
 
        if (debug_level >= DEBUG_LEVEL_BH)
                printk( "%s(%d):bh_handler(%s) exit\n",
                        __FILE__,__LINE__,info->device_name);
}
 
void bh_transmit(MGSLPC_INFO *info)
{
        struct tty_struct *tty = info->tty;
        if (debug_level >= DEBUG_LEVEL_BH)
                printk("bh_transmit() entry on %s\n", info->device_name);
 
        if (tty) {
                if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
                    tty->ldisc.write_wakeup) {
                        if ( debug_level >= DEBUG_LEVEL_BH )
                                printk( "%s(%d):calling ldisc.write_wakeup on %s\n",
                                        __FILE__,__LINE__,info->device_name);
                        (tty->ldisc.write_wakeup)(tty);
                }
                wake_up_interruptible(&tty->write_wait);
        }
}
 
void bh_status(MGSLPC_INFO *info)
{
        info->ri_chkcount = 0;
        info->dsr_chkcount = 0;
        info->dcd_chkcount = 0;
        info->cts_chkcount = 0;
}
 
/* eom: non-zero = end of frame */
void rx_ready_hdlc(MGSLPC_INFO *info, int eom)
{
        unsigned char data[2];
        unsigned char fifo_count, read_count, i;
        RXBUF *buf = (RXBUF*)(info->rx_buf + (info->rx_put * info->rx_buf_size));
 
        if (debug_level >= DEBUG_LEVEL_ISR)
                printk("%s(%d):rx_ready_hdlc(eom=%d)\n",__FILE__,__LINE__,eom);
 
        if (!info->rx_enabled)
                return;
 
        if (info->rx_frame_count >= info->rx_buf_count) {
                /* no more free buffers */
                issue_command(info, CHA, CMD_RXRESET);
                info->pending_bh |= BH_RECEIVE;
                info->rx_overflow = 1;
                info->icount.buf_overrun++;
                return;
        }
 
        if (eom) {
                /* end of frame, get FIFO count from RBCL register */
                if (!(fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f)))
                        fifo_count = 32;
        } else
                fifo_count = 32;
 
        do {
                if (fifo_count == 1) {
                        read_count = 1;
                        data[0] = read_reg(info, CHA + RXFIFO);
                } else {
                        read_count = 2;
                        *((unsigned short *) data) = read_reg16(info, CHA + RXFIFO);
                }
                fifo_count -= read_count;
                if (!fifo_count && eom)
                        buf->status = data[--read_count];
 
                for (i = 0; i < read_count; i++) {
                        if (buf->count >= info->max_frame_size) {
                                /* frame too large, reset receiver and reset current buffer */
                                issue_command(info, CHA, CMD_RXRESET);
                                buf->count = 0;
                                return;
                        }
                        *(buf->data + buf->count) = data[i];
                        buf->count++;
                }
        } while (fifo_count);
 
        if (eom) {
                info->pending_bh |= BH_RECEIVE;
                info->rx_frame_count++;
                info->rx_put++;
                if (info->rx_put >= info->rx_buf_count)
                        info->rx_put = 0;
        }
        issue_command(info, CHA, CMD_RXFIFO);
}
 
void rx_ready_async(MGSLPC_INFO *info, int tcd)
{
        unsigned char data, status;
        int fifo_count;
        struct tty_struct *tty = info->tty;
        struct mgsl_icount *icount = &info->icount;
 
        if (tcd) {
                /* early termination, get FIFO count from RBCL register */
                fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
 
                /* Zero fifo count could mean 0 or 32 bytes available.
                 * If BIT5 of STAR is set then at least 1 byte is available.
                 */
                if (!fifo_count && (read_reg(info,CHA+STAR) & BIT5))
                        fifo_count = 32;
        } else
                fifo_count = 32;
 
        /* Flush received async data to receive data buffer. */
        while (fifo_count) {
                data   = read_reg(info, CHA + RXFIFO);
                status = read_reg(info, CHA + RXFIFO);
                fifo_count -= 2;
 
                if (tty->flip.count >= TTY_FLIPBUF_SIZE)
                        break;
 
                *tty->flip.char_buf_ptr = data;
                icount->rx++;
 
                *tty->flip.flag_buf_ptr = 0;
 
                // if no frameing/crc error then save data
                // BIT7:parity error
                // BIT6:framing error
 
                if (status & (BIT7 + BIT6)) {
                        if (status & BIT7)
                                icount->parity++;
                        else
                                icount->frame++;
 
                        /* discard char if tty control flags say so */
                        if (status & info->ignore_status_mask)
                                continue;
 
                        status &= info->read_status_mask;
 
                        if (status & BIT7)
                                *tty->flip.flag_buf_ptr = TTY_PARITY;
                        else if (status & BIT6)
                                *tty->flip.flag_buf_ptr = TTY_FRAME;
                }
 
                tty->flip.flag_buf_ptr++;
                tty->flip.char_buf_ptr++;
                tty->flip.count++;
        }
        issue_command(info, CHA, CMD_RXFIFO);
 
        if (debug_level >= DEBUG_LEVEL_ISR) {
                printk("%s(%d):rx_ready_async count=%d\n",
                        __FILE__,__LINE__,tty->flip.count);
                printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
                        __FILE__,__LINE__,icount->rx,icount->brk,
                        icount->parity,icount->frame,icount->overrun);
        }
 
        if (tty->flip.count)
                tty_flip_buffer_push(tty);
}
 
 
void tx_done(MGSLPC_INFO *info)
{
        if (!info->tx_active)
                return;
 
        info->tx_active = 0;
        info->tx_aborting = 0;
 
        if (info->params.mode == MGSL_MODE_ASYNC)
                return;
 
        info->tx_count = info->tx_put = info->tx_get = 0;
        del_timer(&info->tx_timer);
 
        if (info->drop_rts_on_tx_done) {
                get_signals(info);
                if (info->serial_signals & SerialSignal_RTS) {
                        info->serial_signals &= ~SerialSignal_RTS;
                        set_signals(info);
                }
                info->drop_rts_on_tx_done = 0;
        }
 
#ifdef CONFIG_SYNCLINK_SYNCPPP  
        if (info->netcount)
                mgslpc_sppp_tx_done(info);
        else
#endif
        {
                if (info->tty->stopped || info->tty->hw_stopped) {
                        tx_stop(info);
                        return;
                }
                info->pending_bh |= BH_TRANSMIT;
        }
}
 
void tx_ready(MGSLPC_INFO *info)
{
        unsigned char fifo_count = 32;
        int c;
 
        if (debug_level >= DEBUG_LEVEL_ISR)
                printk("%s(%d):tx_ready(%s)\n", __FILE__,__LINE__,info->device_name);
 
        if (info->params.mode == MGSL_MODE_HDLC) {
                if (!info->tx_active)
                        return;
        } else {
                if (info->tty->stopped || info->tty->hw_stopped) {
                        tx_stop(info);
                        return;
                }
                if (!info->tx_count)
                        info->tx_active = 0;
        }
 
        if (!info->tx_count)
                return;
 
        while (info->tx_count && fifo_count) {
                c = MIN(2, MIN(fifo_count, MIN(info->tx_count, TXBUFSIZE - info->tx_get)));
 
                if (c == 1) {
                        write_reg(info, CHA + TXFIFO, *(info->tx_buf + info->tx_get));
                } else {
                        write_reg16(info, CHA + TXFIFO,
                                          *((unsigned short*)(info->tx_buf + info->tx_get)));
                }
                info->tx_count -= c;
                info->tx_get = (info->tx_get + c) & (TXBUFSIZE - 1);
                fifo_count -= c;
        }
 
        if (info->params.mode == MGSL_MODE_ASYNC) {
                if (info->tx_count < WAKEUP_CHARS)
                        info->pending_bh |= BH_TRANSMIT;
                issue_command(info, CHA, CMD_TXFIFO);
        } else {
                if (info->tx_count)
                        issue_command(info, CHA, CMD_TXFIFO);
                else
                        issue_command(info, CHA, CMD_TXFIFO + CMD_TXEOM);
        }
}
 
void cts_change(MGSLPC_INFO *info)
{
        get_signals(info);
        if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
                irq_disable(info, CHB, IRQ_CTS);
        info->icount.cts++;
        if (info->serial_signals & SerialSignal_CTS)
                info->input_signal_events.cts_up++;
        else
                info->input_signal_events.cts_down++;
        wake_up_interruptible(&info->status_event_wait_q);
        wake_up_interruptible(&info->event_wait_q);
 
        if (info->flags & ASYNC_CTS_FLOW) {
                if (info->tty->hw_stopped) {
                        if (info->serial_signals & SerialSignal_CTS) {
                                if (debug_level >= DEBUG_LEVEL_ISR)
                                        printk("CTS tx start...");
                                if (info->tty)
                                        info->tty->hw_stopped = 0;
                                tx_start(info);
                                info->pending_bh |= BH_TRANSMIT;
                                return;
                        }
                } else {
                        if (!(info->serial_signals & SerialSignal_CTS)) {
                                if (debug_level >= DEBUG_LEVEL_ISR)
                                        printk("CTS tx stop...");
                                if (info->tty)
                                        info->tty->hw_stopped = 1;
                                tx_stop(info);
                        }
                }
        }
        info->pending_bh |= BH_STATUS;
}
 
void dcd_change(MGSLPC_INFO *info)
{
        get_signals(info);
        if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
                irq_disable(info, CHB, IRQ_DCD);
        info->icount.dcd++;
        if (info->serial_signals & SerialSignal_DCD) {
                info->input_signal_events.dcd_up++;
#ifdef CONFIG_SYNCLINK_SYNCPPP  
                if (info->netcount)
                        sppp_reopen(info->netdev);
#endif
        }
        else
                info->input_signal_events.dcd_down++;
        wake_up_interruptible(&info->status_event_wait_q);
        wake_up_interruptible(&info->event_wait_q);
 
        if (info->flags & ASYNC_CHECK_CD) {
                if (debug_level >= DEBUG_LEVEL_ISR)
                        printk("%s CD now %s...", info->device_name,
                               (info->serial_signals & SerialSignal_DCD) ? "on" : "off");
                if (info->serial_signals & SerialSignal_DCD)
                        wake_up_interruptible(&info->open_wait);
                else if (!(info->flags & (ASYNC_CALLOUT_ACTIVE | ASYNC_CALLOUT_NOHUP))) {
                        if (debug_level >= DEBUG_LEVEL_ISR)
                                printk("doing serial hangup...");
                        if (info->tty)
                                tty_hangup(info->tty);
                }
        }
        info->pending_bh |= BH_STATUS;
}
 
void dsr_change(MGSLPC_INFO *info)
{
        get_signals(info);
        if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
                port_irq_disable(info, PVR_DSR);
        info->icount.dsr++;
        if (info->serial_signals & SerialSignal_DSR)
                info->input_signal_events.dsr_up++;
        else
                info->input_signal_events.dsr_down++;
        wake_up_interruptible(&info->status_event_wait_q);
        wake_up_interruptible(&info->event_wait_q);
        info->pending_bh |= BH_STATUS;
}
 
void ri_change(MGSLPC_INFO *info)
{
        get_signals(info);
        if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
                port_irq_disable(info, PVR_RI);
        info->icount.rng++;
        if (info->serial_signals & SerialSignal_RI)
                info->input_signal_events.ri_up++;
        else
                info->input_signal_events.ri_down++;
        wake_up_interruptible(&info->status_event_wait_q);
        wake_up_interruptible(&info->event_wait_q);
        info->pending_bh |= BH_STATUS;
}
 
/* Interrupt service routine entry point.
 *
 * Arguments:
 *
 * irq     interrupt number that caused interrupt
 * dev_id  device ID supplied during interrupt registration
 * regs    interrupted processor context
 */
static void mgslpc_isr(int irq, void *dev_id, struct pt_regs * regs)
{
        MGSLPC_INFO * info = (MGSLPC_INFO *)dev_id;
        unsigned short isr;
        unsigned char gis, pis;
        int count=0;
 
        if (debug_level >= DEBUG_LEVEL_ISR)
                printk("mgslpc_isr(%d) entry.\n", irq);
        if (!info)
                return;
 
        if (!(info->link.state & DEV_CONFIG))
                return;
 
        spin_lock(&info->lock);
 
        while ((gis = read_reg(info, CHA + GIS))) {
                if (debug_level >= DEBUG_LEVEL_ISR)
                        printk("mgslpc_isr %s gis=%04X\n", info->device_name,gis);
 
                if ((gis & 0x70) || count > 1000) {
                        printk("synclink_cs:hardware failed or ejected\n");
                        break;
                }
                count++;
 
                if (gis & (BIT1 + BIT0)) {
                        isr = read_reg16(info, CHB + ISR);
                        if (isr & IRQ_DCD)
                                dcd_change(info);
                        if (isr & IRQ_CTS)
                                cts_change(info);
                }
                if (gis & (BIT3 + BIT2))
                {
                        isr = read_reg16(info, CHA + ISR);
                        if (isr & IRQ_TIMER) {
                                info->irq_occurred = 1;
                                irq_disable(info, CHA, IRQ_TIMER);
                        }
 
                        /* receive IRQs */
                        if (isr & IRQ_EXITHUNT) {
                                info->icount.exithunt++;
                                wake_up_interruptible(&info->event_wait_q);
                        }
                        if (isr & IRQ_BREAK_ON) {
                                info->icount.brk++;
                                if (info->flags & ASYNC_SAK)
                                        do_SAK(info->tty);
                        }
                        if (isr & IRQ_RXTIME) {
                                issue_command(info, CHA, CMD_RXFIFO_READ);
                        }
                        if (isr & (IRQ_RXEOM + IRQ_RXFIFO)) {
                                if (info->params.mode == MGSL_MODE_HDLC)
                                        rx_ready_hdlc(info, isr & IRQ_RXEOM);
                                else
                                        rx_ready_async(info, isr & IRQ_RXEOM);
                        }
 
                        /* transmit IRQs */
                        if (isr & IRQ_UNDERRUN) {
                                if (info->tx_aborting)
                                        info->icount.txabort++;
                                else
                                        info->icount.txunder++;
                                tx_done(info);
                        }
                        else if (isr & IRQ_ALLSENT) {
                                info->icount.txok++;
                                tx_done(info);
                        }
                        else if (isr & IRQ_TXFIFO)
                                tx_ready(info);
                }
                if (gis & BIT7) {
                        pis = read_reg(info, CHA + PIS);
                        if (pis & BIT1)
                                dsr_change(info);
                        if (pis & BIT2)
                                ri_change(info);
                }
        }
 
        /* Request bottom half processing if there's something
         * for it to do and the bh is not already running
         */
 
        if (info->pending_bh && !info->bh_running && !info->bh_requested) {
                if ( debug_level >= DEBUG_LEVEL_ISR )
                        printk("%s(%d):%s queueing bh task.\n",
                                __FILE__,__LINE__,info->device_name);
                queue_task(&info->task, &tq_immediate);
                mark_bh(IMMEDIATE_BH);
                info->bh_requested = 1;
        }
 
        spin_unlock(&info->lock);
 
        if (debug_level >= DEBUG_LEVEL_ISR)
                printk("%s(%d):mgslpc_isr(%d)exit.\n",
                       __FILE__,__LINE__,irq);
}
 
/* Initialize and start device.
 */
static int startup(MGSLPC_INFO * info)
{
        int retval = 0;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):startup(%s)\n",__FILE__,__LINE__,info->device_name);
 
        if (info->flags & ASYNC_INITIALIZED)
                return 0;
 
        if (!info->tx_buf) {
                /* allocate a page of memory for a transmit buffer */
                info->tx_buf = (unsigned char *)get_free_page(GFP_KERNEL);
                if (!info->tx_buf) {
                        printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
                                __FILE__,__LINE__,info->device_name);
                        return -ENOMEM;
                }
        }
 
        info->pending_bh = 0;
 
        init_timer(&info->tx_timer);
        info->tx_timer.data = (unsigned long)info;
        info->tx_timer.function = tx_timeout;
 
        /* Allocate and claim adapter resources */
        retval = claim_resources(info);
 
        /* perform existance check and diagnostics */
        if ( !retval )
                retval = adapter_test(info);
 
        if ( retval ) {
                if (capable(CAP_SYS_ADMIN) && info->tty)
                        set_bit(TTY_IO_ERROR, &info->tty->flags);
                release_resources(info);
                return retval;
        }
 
        /* program hardware for current parameters */
        mgslpc_change_params(info);
 
        if (info->tty)
                clear_bit(TTY_IO_ERROR, &info->tty->flags);
 
        info->flags |= ASYNC_INITIALIZED;
 
        return 0;
}
 
/* Called by mgslpc_close() and mgslpc_hangup() to shutdown hardware
 */
static void shutdown(MGSLPC_INFO * info)
{
        unsigned long flags;
 
        if (!(info->flags & ASYNC_INITIALIZED))
                return;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):mgslpc_shutdown(%s)\n",
                         __FILE__,__LINE__, info->device_name );
 
        /* clear status wait queue because status changes */
        /* can't happen after shutting down the hardware */
        wake_up_interruptible(&info->status_event_wait_q);
        wake_up_interruptible(&info->event_wait_q);
 
        del_timer(&info->tx_timer);
 
        if (info->tx_buf) {
                free_page((unsigned long) info->tx_buf);
                info->tx_buf = 0;
        }
 
        spin_lock_irqsave(&info->lock,flags);
 
        rx_stop(info);
        tx_stop(info);
 
        /* TODO:disable interrupts instead of reset to preserve signal states */
        reset_device(info);
 
        if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
                info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
                set_signals(info);
        }
 
        spin_unlock_irqrestore(&info->lock,flags);
 
        release_resources(info);
 
        if (info->tty)
                set_bit(TTY_IO_ERROR, &info->tty->flags);
 
        info->flags &= ~ASYNC_INITIALIZED;
}
 
static void mgslpc_program_hw(MGSLPC_INFO *info)
{
        unsigned long flags;
 
        spin_lock_irqsave(&info->lock,flags);
 
        rx_stop(info);
        tx_stop(info);
        info->tx_count = info->tx_put = info->tx_get = 0;
 
        if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
                hdlc_mode(info);
        else
                async_mode(info);
 
        set_signals(info);
 
        info->dcd_chkcount = 0;
        info->cts_chkcount = 0;
        info->ri_chkcount = 0;
        info->dsr_chkcount = 0;
 
        irq_enable(info, CHB, IRQ_DCD | IRQ_CTS);
        port_irq_enable(info, (unsigned char) PVR_DSR | PVR_RI);
        get_signals(info);
 
        if (info->netcount || info->tty->termios->c_cflag & CREAD)
                rx_start(info);
 
        spin_unlock_irqrestore(&info->lock,flags);
}
 
/* Reconfigure adapter based on new parameters
 */
static void mgslpc_change_params(MGSLPC_INFO *info)
{
        unsigned cflag;
        int bits_per_char;
 
        if (!info->tty || !info->tty->termios)
                return;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):mgslpc_change_params(%s)\n",
                         __FILE__,__LINE__, info->device_name );
 
        cflag = info->tty->termios->c_cflag;
 
        /* if B0 rate (hangup) specified then negate DTR and RTS */
        /* otherwise assert DTR and RTS */
        if (cflag & CBAUD)
                info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
        else
                info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
 
        /* byte size and parity */
 
        switch (cflag & CSIZE) {
        case CS5: info->params.data_bits = 5; break;
        case CS6: info->params.data_bits = 6; break;
        case CS7: info->params.data_bits = 7; break;
        case CS8: info->params.data_bits = 8; break;
        default:  info->params.data_bits = 7; break;
        }
 
        if (cflag & CSTOPB)
                info->params.stop_bits = 2;
        else
                info->params.stop_bits = 1;
 
        info->params.parity = ASYNC_PARITY_NONE;
        if (cflag & PARENB) {
                if (cflag & PARODD)
                        info->params.parity = ASYNC_PARITY_ODD;
                else
                        info->params.parity = ASYNC_PARITY_EVEN;
#ifdef CMSPAR
                if (cflag & CMSPAR)
                        info->params.parity = ASYNC_PARITY_SPACE;
#endif
        }
 
        /* calculate number of jiffies to transmit a full
         * FIFO (32 bytes) at specified data rate
         */
        bits_per_char = info->params.data_bits +
                        info->params.stop_bits + 1;
 
        /* if port data rate is set to 460800 or less then
         * allow tty settings to override, otherwise keep the
         * current data rate.
         */
        if (info->params.data_rate <= 460800) {
                info->params.data_rate = tty_get_baud_rate(info->tty);
        }
 
        if ( info->params.data_rate ) {
                info->timeout = (32*HZ*bits_per_char) /
                                info->params.data_rate;
        }
        info->timeout += HZ/50;         /* Add .02 seconds of slop */
 
        if (cflag & CRTSCTS)
                info->flags |= ASYNC_CTS_FLOW;
        else
                info->flags &= ~ASYNC_CTS_FLOW;
 
        if (cflag & CLOCAL)
                info->flags &= ~ASYNC_CHECK_CD;
        else
                info->flags |= ASYNC_CHECK_CD;
 
        /* process tty input control flags */
 
        info->read_status_mask = 0;
        if (I_INPCK(info->tty))
                info->read_status_mask |= BIT7 | BIT6;
        if (I_IGNPAR(info->tty))
                info->ignore_status_mask |= BIT7 | BIT6;
 
        mgslpc_program_hw(info);
}
 
/* Add a character to the transmit buffer
 */
static void mgslpc_put_char(struct tty_struct *tty, unsigned char ch)
{
        MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
        unsigned long flags;
 
        if (debug_level >= DEBUG_LEVEL_INFO) {
                printk( "%s(%d):mgslpc_put_char(%d) on %s\n",
                        __FILE__,__LINE__,ch,info->device_name);
        }
 
        if (mgslpc_paranoia_check(info, tty->device, "mgslpc_put_char"))
                return;
 
        if (!tty || !info->tx_buf)
                return;
 
        spin_lock_irqsave(&info->lock,flags);
 
        if (info->params.mode == MGSL_MODE_ASYNC || !info->tx_active) {
                if (info->tx_count < TXBUFSIZE - 1) {
                        info->tx_buf[info->tx_put++] = ch;
                        info->tx_put &= TXBUFSIZE-1;
                        info->tx_count++;
                }
        }
 
        spin_unlock_irqrestore(&info->lock,flags);
}
 
/* Enable transmitter so remaining characters in the
 * transmit buffer are sent.
 */
static void mgslpc_flush_chars(struct tty_struct *tty)
{
        MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
        unsigned long flags;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk( "%s(%d):mgslpc_flush_chars() entry on %s tx_count=%d\n",
                        __FILE__,__LINE__,info->device_name,info->tx_count);
 
        if (mgslpc_paranoia_check(info, tty->device, "mgslpc_flush_chars"))
                return;
 
        if (info->tx_count <= 0 || tty->stopped ||
            tty->hw_stopped || !info->tx_buf)
                return;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk( "%s(%d):mgslpc_flush_chars() entry on %s starting transmitter\n",
                        __FILE__,__LINE__,info->device_name);
 
        spin_lock_irqsave(&info->lock,flags);
        if (!info->tx_active)
                tx_start(info);
        spin_unlock_irqrestore(&info->lock,flags);
}
 
/* Send a block of data
 *
 * Arguments:
 *
 * tty        pointer to tty information structure
 * from_user  flag: 1 = from user process
 * buf        pointer to buffer containing send data
 * count      size of send data in bytes
 *
 * Returns: number of characters written
 */
static int mgslpc_write(struct tty_struct * tty, int from_user,
                        const unsigned char *buf, int count)
{
        int c, ret = 0, err;
        MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
        unsigned long flags;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk( "%s(%d):mgslpc_write(%s) count=%d\n",
                        __FILE__,__LINE__,info->device_name,count);
 
        if (mgslpc_paranoia_check(info, tty->device, "mgslpc_write") ||
            !tty || !info->tx_buf)
                goto cleanup;
 
        if (info->params.mode == MGSL_MODE_HDLC) {
                if (count > TXBUFSIZE) {
                        ret = -EIO;
                        goto cleanup;
                }
                if (info->tx_active)
                        goto cleanup;
                else if (info->tx_count)
                        goto start;
        }
 
        for (;;) {
                c = MIN(count,
                        MIN(TXBUFSIZE - info->tx_count - 1,
                            TXBUFSIZE - info->tx_put));
                if (c <= 0)
                        break;
 
                if (from_user) {
                        COPY_FROM_USER(err, info->tx_buf + info->tx_put, buf, c);
                        if (err) {
                                if (!ret)
                                        ret = -EFAULT;
                                break;
                        }
                } else
                        memcpy(info->tx_buf + info->tx_put, buf, c);
 
                spin_lock_irqsave(&info->lock,flags);
                info->tx_put = (info->tx_put + c) & (TXBUFSIZE-1);
                info->tx_count += c;
                spin_unlock_irqrestore(&info->lock,flags);
 
                buf += c;
                count -= c;
                ret += c;
        }
start:
        if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
                spin_lock_irqsave(&info->lock,flags);
                if (!info->tx_active)
                        tx_start(info);
                spin_unlock_irqrestore(&info->lock,flags);
        }
cleanup:
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk( "%s(%d):mgslpc_write(%s) returning=%d\n",
                        __FILE__,__LINE__,info->device_name,ret);
        return ret;
}
 
/* Return the count of free bytes in transmit buffer
 */
static int mgslpc_write_room(struct tty_struct *tty)
{
        MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
        int ret;
 
        if (mgslpc_paranoia_check(info, tty->device, "mgslpc_write_room"))
                return 0;
 
        if (info->params.mode == MGSL_MODE_HDLC) {
                /* HDLC (frame oriented) mode */
                if (info->tx_active)
                        return 0;
                else
                        return HDLC_MAX_FRAME_SIZE;
        } else {
                ret = TXBUFSIZE - info->tx_count - 1;
                if (ret < 0)
                        ret = 0;
        }
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):mgslpc_write_room(%s)=%d\n",
                         __FILE__,__LINE__, info->device_name, ret);
        return ret;
}
 
/* Return the count of bytes in transmit buffer
 */
static int mgslpc_chars_in_buffer(struct tty_struct *tty)
{
        MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
        int rc;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):mgslpc_chars_in_buffer(%s)\n",
                         __FILE__,__LINE__, info->device_name );
 
        if (mgslpc_paranoia_check(info, tty->device, "mgslpc_chars_in_buffer"))
                return 0;
 
        if (info->params.mode == MGSL_MODE_HDLC)
                rc = info->tx_active ? info->max_frame_size : 0;
        else
                rc = info->tx_count;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):mgslpc_chars_in_buffer(%s)=%d\n",
                         __FILE__,__LINE__, info->device_name, rc);
 
        return rc;
}
 
/* Discard all data in the send buffer
 */
static void mgslpc_flush_buffer(struct tty_struct *tty)
{
        MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
        unsigned long flags;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):mgslpc_flush_buffer(%s) entry\n",
                         __FILE__,__LINE__, info->device_name );
 
        if (mgslpc_paranoia_check(info, tty->device, "mgslpc_flush_buffer"))
                return;
 
        spin_lock_irqsave(&info->lock,flags);
        info->tx_count = info->tx_put = info->tx_get = 0;
        del_timer(&info->tx_timer);
        spin_unlock_irqrestore(&info->lock,flags);
 
        wake_up_interruptible(&tty->write_wait);
        if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
            tty->ldisc.write_wakeup)
                (tty->ldisc.write_wakeup)(tty);
}
 
/* Send a high-priority XON/XOFF character
 */
static void mgslpc_send_xchar(struct tty_struct *tty, char ch)
{
        MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
        unsigned long flags;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):mgslpc_send_xchar(%s,%d)\n",
                         __FILE__,__LINE__, info->device_name, ch );
 
        if (mgslpc_paranoia_check(info, tty->device, "mgslpc_send_xchar"))
                return;
 
        info->x_char = ch;
        if (ch) {
                spin_lock_irqsave(&info->lock,flags);
                if (!info->tx_enabled)
                        tx_start(info);
                spin_unlock_irqrestore(&info->lock,flags);
        }
}
 
/* Signal remote device to throttle send data (our receive data)
 */
static void mgslpc_throttle(struct tty_struct * tty)
{
        MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
        unsigned long flags;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):mgslpc_throttle(%s) entry\n",
                         __FILE__,__LINE__, info->device_name );
 
        if (mgslpc_paranoia_check(info, tty->device, "mgslpc_throttle"))
                return;
 
        if (I_IXOFF(tty))
                mgslpc_send_xchar(tty, STOP_CHAR(tty));
 
        if (tty->termios->c_cflag & CRTSCTS) {
                spin_lock_irqsave(&info->lock,flags);
                info->serial_signals &= ~SerialSignal_RTS;
                set_signals(info);
                spin_unlock_irqrestore(&info->lock,flags);
        }
}
 
/* Signal remote device to stop throttling send data (our receive data)
 */
static void mgslpc_unthrottle(struct tty_struct * tty)
{
        MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
        unsigned long flags;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):mgslpc_unthrottle(%s) entry\n",
                         __FILE__,__LINE__, info->device_name );
 
        if (mgslpc_paranoia_check(info, tty->device, "mgslpc_unthrottle"))
                return;
 
        if (I_IXOFF(tty)) {
                if (info->x_char)
                        info->x_char = 0;
                else
                        mgslpc_send_xchar(tty, START_CHAR(tty));
        }
 
        if (tty->termios->c_cflag & CRTSCTS) {
                spin_lock_irqsave(&info->lock,flags);
                info->serial_signals |= SerialSignal_RTS;
                set_signals(info);
                spin_unlock_irqrestore(&info->lock,flags);
        }
}
 
/* get the current serial statistics
 */
static int get_stats(MGSLPC_INFO * info, struct mgsl_icount *user_icount)
{
        int err;
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("get_params(%s)\n", info->device_name);
        COPY_TO_USER(err,user_icount, &info->icount, sizeof(struct mgsl_icount));
        if (err)
                return -EFAULT;
        return 0;
}
 
/* get the current serial parameters
 */
static int get_params(MGSLPC_INFO * info, MGSL_PARAMS *user_params)
{
        int err;
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("get_params(%s)\n", info->device_name);
        COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
        if (err)
                return -EFAULT;
        return 0;
}
 
/* set the serial parameters
 *
 * Arguments:
 *
 *      info            pointer to device instance data
 *      new_params      user buffer containing new serial params
 *
 * Returns:     0 if success, otherwise error code
 */
static int set_params(MGSLPC_INFO * info, MGSL_PARAMS *new_params)
{
        unsigned long flags;
        MGSL_PARAMS tmp_params;
        int err;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):set_params %s\n", __FILE__,__LINE__,
                        info->device_name );
        COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
        if (err) {
                if ( debug_level >= DEBUG_LEVEL_INFO )
                        printk( "%s(%d):set_params(%s) user buffer copy failed\n",
                                __FILE__,__LINE__,info->device_name);
                return -EFAULT;
        }
 
        spin_lock_irqsave(&info->lock,flags);
        memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
        spin_unlock_irqrestore(&info->lock,flags);
 
        mgslpc_change_params(info);
 
        return 0;
}
 
static int get_txidle(MGSLPC_INFO * info, int*idle_mode)
{
        int err;
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("get_txidle(%s)=%d\n", info->device_name, info->idle_mode);
        COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
        if (err)
                return -EFAULT;
        return 0;
}
 
static int set_txidle(MGSLPC_INFO * info, int idle_mode)
{
        unsigned long flags;
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("set_txidle(%s,%d)\n", info->device_name, idle_mode);
        spin_lock_irqsave(&info->lock,flags);
        info->idle_mode = idle_mode;
        tx_set_idle(info);
        spin_unlock_irqrestore(&info->lock,flags);
        return 0;
}
 
static int get_interface(MGSLPC_INFO * info, int*if_mode)
{
        int err;
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("get_interface(%s)=%d\n", info->device_name, info->if_mode);
        COPY_TO_USER(err,if_mode, &info->if_mode, sizeof(int));
        if (err)
                return -EFAULT;
        return 0;
}
 
static int set_interface(MGSLPC_INFO * info, int if_mode)
{
        unsigned long flags;
        unsigned char val;
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("set_interface(%s,%d)\n", info->device_name, if_mode);
        spin_lock_irqsave(&info->lock,flags);
        info->if_mode = if_mode;
 
        val = read_reg(info, PVR) & 0x0f;
        switch (info->if_mode)
        {
        case MGSL_INTERFACE_RS232: val |= PVR_RS232; break;
        case MGSL_INTERFACE_V35:   val |= PVR_V35;   break;
        case MGSL_INTERFACE_RS422: val |= PVR_RS422; break;
        }
        write_reg(info, PVR, val);
 
        spin_unlock_irqrestore(&info->lock,flags);
        return 0;
}
 
static int set_txenable(MGSLPC_INFO * info, int enable)
{
        unsigned long flags;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("set_txenable(%s,%d)\n", info->device_name, enable);
 
        spin_lock_irqsave(&info->lock,flags);
        if (enable) {
                if (!info->tx_enabled)
                        tx_start(info);
        } else {
                if (info->tx_enabled)
                        tx_stop(info);
        }
        spin_unlock_irqrestore(&info->lock,flags);
        return 0;
}
 
static int tx_abort(MGSLPC_INFO * info)
{
        unsigned long flags;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("tx_abort(%s)\n", info->device_name);
 
        spin_lock_irqsave(&info->lock,flags);
        if (info->tx_active && info->tx_count &&
            info->params.mode == MGSL_MODE_HDLC) {
                /* clear data count so FIFO is not filled on next IRQ.
                 * This results in underrun and abort transmission.
                 */
                info->tx_count = info->tx_put = info->tx_get = 0;
                info->tx_aborting = TRUE;
        }
        spin_unlock_irqrestore(&info->lock,flags);
        return 0;
}
 
static int set_rxenable(MGSLPC_INFO * info, int enable)
{
        unsigned long flags;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("set_rxenable(%s,%d)\n", info->device_name, enable);
 
        spin_lock_irqsave(&info->lock,flags);
        if (enable) {
                if (!info->rx_enabled)
                        rx_start(info);
        } else {
                if (info->rx_enabled)
                        rx_stop(info);
        }
        spin_unlock_irqrestore(&info->lock,flags);
        return 0;
}
 
/* wait for specified event to occur
 *
 * Arguments:           info    pointer to device instance data
 *                      mask    pointer to bitmask of events to wait for
 * Return Value:        0       if successful and bit mask updated with
 *                              of events triggerred,
 *                      otherwise error code
 */
static int wait_events(MGSLPC_INFO * info, int * mask_ptr)
{
        unsigned long flags;
        int s;
        int rc=0;
        struct mgsl_icount cprev, cnow;
        int events;
        int mask;
        struct  _input_signal_events oldsigs, newsigs;
        DECLARE_WAITQUEUE(wait, current);
 
        COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
        if (rc)
                return  -EFAULT;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("wait_events(%s,%d)\n", info->device_name, mask);
 
        spin_lock_irqsave(&info->lock,flags);
 
        /* return immediately if state matches requested events */
        get_signals(info);
        s = info->serial_signals;
        events = mask &
                ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
                  ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
                  ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
                  ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
        if (events) {
                spin_unlock_irqrestore(&info->lock,flags);
                goto exit;
        }
 
        /* save current irq counts */
        cprev = info->icount;
        oldsigs = info->input_signal_events;
 
        if ((info->params.mode == MGSL_MODE_HDLC) &&
            (mask & MgslEvent_ExitHuntMode))
                irq_enable(info, CHA, IRQ_EXITHUNT);
 
        set_current_state(TASK_INTERRUPTIBLE);
        add_wait_queue(&info->event_wait_q, &wait);
 
        spin_unlock_irqrestore(&info->lock,flags);
 
 
        for(;;) {
                schedule();
                if (signal_pending(current)) {
                        rc = -ERESTARTSYS;
                        break;
                }
 
                /* get current irq counts */
                spin_lock_irqsave(&info->lock,flags);
                cnow = info->icount;
                newsigs = info->input_signal_events;
                set_current_state(TASK_INTERRUPTIBLE);
                spin_unlock_irqrestore(&info->lock,flags);
 
                /* if no change, wait aborted for some reason */
                if (newsigs.dsr_up   == oldsigs.dsr_up   &&
                    newsigs.dsr_down == oldsigs.dsr_down &&
                    newsigs.dcd_up   == oldsigs.dcd_up   &&
                    newsigs.dcd_down == oldsigs.dcd_down &&
                    newsigs.cts_up   == oldsigs.cts_up   &&
                    newsigs.cts_down == oldsigs.cts_down &&
                    newsigs.ri_up    == oldsigs.ri_up    &&
                    newsigs.ri_down  == oldsigs.ri_down  &&
                    cnow.exithunt    == cprev.exithunt   &&
                    cnow.rxidle      == cprev.rxidle) {
                        rc = -EIO;
                        break;
                }
 
                events = mask &
                        ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
                          (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
                          (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
                          (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
                          (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
                          (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
                          (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
                          (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
                          (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
                          (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
                if (events)
                        break;
 
                cprev = cnow;
                oldsigs = newsigs;
        }
 
        remove_wait_queue(&info->event_wait_q, &wait);
        set_current_state(TASK_RUNNING);
 
        if (mask & MgslEvent_ExitHuntMode) {
                spin_lock_irqsave(&info->lock,flags);
                if (!waitqueue_active(&info->event_wait_q))
                        irq_disable(info, CHA, IRQ_EXITHUNT);
                spin_unlock_irqrestore(&info->lock,flags);
        }
exit:
        if (rc == 0)
                PUT_USER(rc, events, mask_ptr);
        return rc;
}
 
static int modem_input_wait(MGSLPC_INFO *info,int arg)
{
        unsigned long flags;
        int rc;
        struct mgsl_icount cprev, cnow;
        DECLARE_WAITQUEUE(wait, current);
 
        /* save current irq counts */
        spin_lock_irqsave(&info->lock,flags);
        cprev = info->icount;
        add_wait_queue(&info->status_event_wait_q, &wait);
        set_current_state(TASK_INTERRUPTIBLE);
        spin_unlock_irqrestore(&info->lock,flags);
 
        for(;;) {
                schedule();
                if (signal_pending(current)) {
                        rc = -ERESTARTSYS;
                        break;
                }
 
                /* get new irq counts */
                spin_lock_irqsave(&info->lock,flags);
                cnow = info->icount;
                set_current_state(TASK_INTERRUPTIBLE);
                spin_unlock_irqrestore(&info->lock,flags);
 
                /* if no change, wait aborted for some reason */
                if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
                    cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
                        rc = -EIO;
                        break;
                }
 
                /* check for change in caller specified modem input */
                if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
                    (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
                    (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
                    (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
                        rc = 0;
                        break;
                }
 
                cprev = cnow;
        }
        remove_wait_queue(&info->status_event_wait_q, &wait);
        set_current_state(TASK_RUNNING);
        return rc;
}
 
/* Return state of the serial control/status signals
 *
 * Arguments:           info    pointer to device instance data
 *                      value   pointer to int to hold returned info
 *
 * Return Value:        0 if success, otherwise error code
 */
static int get_modem_info(MGSLPC_INFO * info, unsigned int *value)
{
        unsigned int result;
        unsigned long flags;
        int err;
 
        spin_lock_irqsave(&info->lock,flags);
        get_signals(info);
        spin_unlock_irqrestore(&info->lock,flags);
 
        result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) |
                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) |
                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) |
                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) |
                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) |
                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("mgslpc_get_modem_info %s value=%08X\n", info->device_name, result);
 
        PUT_USER(err,result,value);
        return err ? -EFAULT : 0;
}
 
/* Set the state of the modem control signals (DTR/RTS)
 *
 * Arguments:
 *
 *      info    pointer to device instance data
 *      cmd     signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
 *              TIOCMSET = set/clear signal values
 *      value   bit mask for command
 *
 * Return Value:        0 if success, otherwise error code
 */
static int set_modem_info(MGSLPC_INFO * info, unsigned int cmd,
                          unsigned int *value)
{
        int error;
        unsigned int arg;
        unsigned long flags;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("mgslpc_set_modem_info %s\n", info->device_name);
 
        GET_USER(error,arg,value);
        if (error)
                return error;
 
        switch (cmd) {
        case TIOCMBIS:
                if (arg & TIOCM_RTS)
                        info->serial_signals |= SerialSignal_RTS;
                if (arg & TIOCM_DTR)
                        info->serial_signals |= SerialSignal_DTR;
                break;
        case TIOCMBIC:
                if (arg & TIOCM_RTS)
                        info->serial_signals &= ~SerialSignal_RTS;
                if (arg & TIOCM_DTR)
                        info->serial_signals &= ~SerialSignal_DTR;
                break;
        case TIOCMSET:
                if (arg & TIOCM_RTS)
                        info->serial_signals |= SerialSignal_RTS;
                else
                        info->serial_signals &= ~SerialSignal_RTS;
 
                if (arg & TIOCM_DTR)
                        info->serial_signals |= SerialSignal_DTR;
                else
                        info->serial_signals &= ~SerialSignal_DTR;
                break;
        default:
                return -EINVAL;
        }
 
        spin_lock_irqsave(&info->lock,flags);
        set_signals(info);
        spin_unlock_irqrestore(&info->lock,flags);
 
        return 0;
}
 
/* Set or clear transmit break condition
 *
 * Arguments:           tty             pointer to tty instance data
 *                      break_state     -1=set break condition, 0=clear
 */
static void mgslpc_break(struct tty_struct *tty, int break_state)
{
        MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
        unsigned long flags;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):mgslpc_break(%s,%d)\n",
                         __FILE__,__LINE__, info->device_name, break_state);
 
        if (mgslpc_paranoia_check(info, tty->device, "mgslpc_break"))
                return;
 
        spin_lock_irqsave(&info->lock,flags);
        if (break_state == -1)
                set_reg_bits(info, CHA+DAFO, BIT6);
        else
                clear_reg_bits(info, CHA+DAFO, BIT6);
        spin_unlock_irqrestore(&info->lock,flags);
}
 
/* Service an IOCTL request
 *
 * Arguments:
 *
 *      tty     pointer to tty instance data
 *      file    pointer to associated file object for device
 *      cmd     IOCTL command code
 *      arg     command argument/context
 *
 * Return Value:        0 if success, otherwise error code
 */
static int mgslpc_ioctl(struct tty_struct *tty, struct file * file,
                        unsigned int cmd, unsigned long arg)
{
        MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
                        info->device_name, cmd );
 
        if (mgslpc_paranoia_check(info, tty->device, "mgslpc_ioctl"))
                return -ENODEV;
 
        if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
            (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
                if (tty->flags & (1 << TTY_IO_ERROR))
                    return -EIO;
        }
 
        return ioctl_common(info, cmd, arg);
}
 
int ioctl_common(MGSLPC_INFO *info, unsigned int cmd, unsigned long arg)
{
        int error;
        struct mgsl_icount cnow;        /* kernel counter temps */
        struct serial_icounter_struct *p_cuser; /* user space */
        unsigned long flags;
 
        switch (cmd) {
        case TIOCMGET:
                return get_modem_info(info, (unsigned int *) arg);
        case TIOCMBIS:
        case TIOCMBIC:
        case TIOCMSET:
                return set_modem_info(info, cmd, (unsigned int *) arg);
        case MGSL_IOCGPARAMS:
                return get_params(info,(MGSL_PARAMS *)arg);
        case MGSL_IOCSPARAMS:
                return set_params(info,(MGSL_PARAMS *)arg);
        case MGSL_IOCGTXIDLE:
                return get_txidle(info,(int*)arg);
        case MGSL_IOCSTXIDLE:
                return set_txidle(info,(int)arg);
        case MGSL_IOCGIF:
                return get_interface(info,(int*)arg);
        case MGSL_IOCSIF:
                return set_interface(info,(int)arg);
        case MGSL_IOCTXENABLE:
                return set_txenable(info,(int)arg);
        case MGSL_IOCRXENABLE:
                return set_rxenable(info,(int)arg);
        case MGSL_IOCTXABORT:
                return tx_abort(info);
        case MGSL_IOCGSTATS:
                return get_stats(info,(struct mgsl_icount*)arg);
        case MGSL_IOCWAITEVENT:
                return wait_events(info,(int*)arg);
        case MGSL_IOCCLRMODCOUNT:
                while(MOD_IN_USE)
                        MOD_DEC_USE_COUNT;
                return 0;
        case TIOCMIWAIT:
                return modem_input_wait(info,(int)arg);
        case TIOCGICOUNT:
                spin_lock_irqsave(&info->lock,flags);
                cnow = info->icount;
                spin_unlock_irqrestore(&info->lock,flags);
                p_cuser = (struct serial_icounter_struct *) arg;
                PUT_USER(error,cnow.cts, &p_cuser->cts);
                if (error) return error;
                PUT_USER(error,cnow.dsr, &p_cuser->dsr);
                if (error) return error;
                PUT_USER(error,cnow.rng, &p_cuser->rng);
                if (error) return error;
                PUT_USER(error,cnow.dcd, &p_cuser->dcd);
                if (error) return error;
                PUT_USER(error,cnow.rx, &p_cuser->rx);
                if (error) return error;
                PUT_USER(error,cnow.tx, &p_cuser->tx);
                if (error) return error;
                PUT_USER(error,cnow.frame, &p_cuser->frame);
                if (error) return error;
                PUT_USER(error,cnow.overrun, &p_cuser->overrun);
                if (error) return error;
                PUT_USER(error,cnow.parity, &p_cuser->parity);
                if (error) return error;
                PUT_USER(error,cnow.brk, &p_cuser->brk);
                if (error) return error;
                PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
                if (error) return error;
                return 0;
        default:
                return -ENOIOCTLCMD;
        }
        return 0;
}
 
/* Set new termios settings
 *
 * Arguments:
 *
 *      tty             pointer to tty structure
 *      termios         pointer to buffer to hold returned old termios
 */
static void mgslpc_set_termios(struct tty_struct *tty, struct termios *old_termios)
{
        MGSLPC_INFO *info = (MGSLPC_INFO *)tty->driver_data;
        unsigned long flags;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):mgslpc_set_termios %s\n", __FILE__,__LINE__,
                        tty->driver.name );
 
        /* just return if nothing has changed */
        if ((tty->termios->c_cflag == old_termios->c_cflag)
            && (RELEVANT_IFLAG(tty->termios->c_iflag)
                == RELEVANT_IFLAG(old_termios->c_iflag)))
          return;
 
        mgslpc_change_params(info);
 
        /* Handle transition to B0 status */
        if (old_termios->c_cflag & CBAUD &&
            !(tty->termios->c_cflag & CBAUD)) {
                info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
                spin_lock_irqsave(&info->lock,flags);
                set_signals(info);
                spin_unlock_irqrestore(&info->lock,flags);
        }
 
        /* Handle transition away from B0 status */
        if (!(old_termios->c_cflag & CBAUD) &&
            tty->termios->c_cflag & CBAUD) {
                info->serial_signals |= SerialSignal_DTR;
                if (!(tty->termios->c_cflag & CRTSCTS) ||
                    !test_bit(TTY_THROTTLED, &tty->flags)) {
                        info->serial_signals |= SerialSignal_RTS;
                }
                spin_lock_irqsave(&info->lock,flags);
                set_signals(info);
                spin_unlock_irqrestore(&info->lock,flags);
        }
 
        /* Handle turning off CRTSCTS */
        if (old_termios->c_cflag & CRTSCTS &&
            !(tty->termios->c_cflag & CRTSCTS)) {
                tty->hw_stopped = 0;
                tx_release(tty);
        }
}
 
static void mgslpc_close(struct tty_struct *tty, struct file * filp)
{
        MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
 
        if (mgslpc_paranoia_check(info, tty->device, "mgslpc_close"))
                return;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):mgslpc_close(%s) entry, count=%d\n",
                         __FILE__,__LINE__, info->device_name, info->count);
 
        if (!info->count)
                return;
 
        if (tty_hung_up_p(filp))
                goto cleanup;
 
        if ((tty->count == 1) && (info->count != 1)) {
                /*
                 * tty->count is 1 and the tty structure will be freed.
                 * info->count should be one in this case.
                 * if it's not, correct it so that the port is shutdown.
                 */
                printk("mgslpc_close: bad refcount; tty->count is 1, "
                       "info->count is %d\n", info->count);
                info->count = 1;
        }
 
        info->count--;
 
        /* if at least one open remaining, leave hardware active */
        if (info->count)
                goto cleanup;
 
        info->flags |= ASYNC_CLOSING;
 
        /* Save the termios structure, since this port may have
         * separate termios for callout and dialin.
         */
        if (info->flags & ASYNC_NORMAL_ACTIVE)
                info->normal_termios = *tty->termios;
        if (info->flags & ASYNC_CALLOUT_ACTIVE)
                info->callout_termios = *tty->termios;
 
        /* set tty->closing to notify line discipline to
         * only process XON/XOFF characters. Only the N_TTY
         * discipline appears to use this (ppp does not).
         */
        tty->closing = 1;
 
        /* wait for transmit data to clear all layers */
 
        if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
                if (debug_level >= DEBUG_LEVEL_INFO)
                        printk("%s(%d):mgslpc_close(%s) calling tty_wait_until_sent\n",
                                 __FILE__,__LINE__, info->device_name );
                tty_wait_until_sent(tty, info->closing_wait);
        }
 
        if (info->flags & ASYNC_INITIALIZED)
                mgslpc_wait_until_sent(tty, info->timeout);
 
        if (tty->driver.flush_buffer)
                tty->driver.flush_buffer(tty);
 
        if (tty->ldisc.flush_buffer)
                tty->ldisc.flush_buffer(tty);
 
        shutdown(info);
 
        tty->closing = 0;
        info->tty = 0;
 
        if (info->blocked_open) {
                if (info->close_delay) {
                        set_current_state(TASK_INTERRUPTIBLE);
                        schedule_timeout(info->close_delay);
                }
                wake_up_interruptible(&info->open_wait);
        }
 
        info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
                         ASYNC_CLOSING);
 
        wake_up_interruptible(&info->close_wait);
 
cleanup:
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):mgslpc_close(%s) exit, count=%d\n", __FILE__,__LINE__,
                        tty->driver.name, info->count);
        if(MOD_IN_USE)
                MOD_DEC_USE_COUNT;
}
 
/* Wait until the transmitter is empty.
 */
static void mgslpc_wait_until_sent(struct tty_struct *tty, int timeout)
{
        MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
        unsigned long orig_jiffies, char_time;
 
        if (!info )
                return;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):mgslpc_wait_until_sent(%s) entry\n",
                         __FILE__,__LINE__, info->device_name );
 
        if (mgslpc_paranoia_check(info, tty->device, "mgslpc_wait_until_sent"))
                return;
 
        if (!(info->flags & ASYNC_INITIALIZED))
                goto exit;
 
        orig_jiffies = jiffies;
 
        /* Set check interval to 1/5 of estimated time to
         * send a character, and make it at least 1. The check
         * interval should also be less than the timeout.
         * Note: use tight timings here to satisfy the NIST-PCTS.
         */
 
        if ( info->params.data_rate ) {
                char_time = info->timeout/(32 * 5);
                if (!char_time)
                        char_time++;
        } else
                char_time = 1;
 
        if (timeout)
                char_time = MIN(char_time, timeout);
 
        if (info->params.mode == MGSL_MODE_HDLC) {
                while (info->tx_active) {
                        set_current_state(TASK_INTERRUPTIBLE);
                        schedule_timeout(char_time);
                        if (signal_pending(current))
                                break;
                        if (timeout && time_after(jiffies, orig_jiffies + timeout))
                                break;
                }
        } else {
                while ((info->tx_count || info->tx_active) &&
                        info->tx_enabled) {
                        set_current_state(TASK_INTERRUPTIBLE);
                        schedule_timeout(char_time);
                        if (signal_pending(current))
                                break;
                        if (timeout && time_after(jiffies, orig_jiffies + timeout))
                                break;
                }
        }
 
exit:
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):mgslpc_wait_until_sent(%s) exit\n",
                         __FILE__,__LINE__, info->device_name );
}
 
/* Called by tty_hangup() when a hangup is signaled.
 * This is the same as closing all open files for the port.
 */
static void mgslpc_hangup(struct tty_struct *tty)
{
        MGSLPC_INFO * info = (MGSLPC_INFO *)tty->driver_data;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):mgslpc_hangup(%s)\n",
                         __FILE__,__LINE__, info->device_name );
 
        if (mgslpc_paranoia_check(info, tty->device, "mgslpc_hangup"))
                return;
 
        mgslpc_flush_buffer(tty);
        shutdown(info);
 
        info->count = 0;
        info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
        info->tty = 0;
 
        wake_up_interruptible(&info->open_wait);
}
 
/* Block the current process until the specified port
 * is ready to be opened.
 */
static int block_til_ready(struct tty_struct *tty, struct file *filp,
                           MGSLPC_INFO *info)
{
        DECLARE_WAITQUEUE(wait, current);
        int             retval;
        int             do_clocal = 0, extra_count = 0;
        unsigned long   flags;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):block_til_ready on %s\n",
                         __FILE__,__LINE__, tty->driver.name );
 
        if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
                /* this is a callout device */
                /* just verify that normal device is not in use */
                if (info->flags & ASYNC_NORMAL_ACTIVE)
                        return -EBUSY;
                if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
                    (info->flags & ASYNC_SESSION_LOCKOUT) &&
                    (info->session != current->session))
                    return -EBUSY;
                if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
                    (info->flags & ASYNC_PGRP_LOCKOUT) &&
                    (info->pgrp != current->pgrp))
                    return -EBUSY;
                info->flags |= ASYNC_CALLOUT_ACTIVE;
                return 0;
        }
 
        if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
                /* nonblock mode is set or port is not enabled */
                /* just verify that callout device is not active */
                if (info->flags & ASYNC_CALLOUT_ACTIVE)
                        return -EBUSY;
                info->flags |= ASYNC_NORMAL_ACTIVE;
                return 0;
        }
 
        if (info->flags & ASYNC_CALLOUT_ACTIVE) {
                if (info->normal_termios.c_cflag & CLOCAL)
                        do_clocal = 1;
        } else {
                if (tty->termios->c_cflag & CLOCAL)
                        do_clocal = 1;
        }
 
        /* Wait for 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
         * mgslpc_close() knows when to free things.  We restore it upon
         * exit, either normal or abnormal.
         */
 
        retval = 0;
        add_wait_queue(&info->open_wait, &wait);
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):block_til_ready before block on %s count=%d\n",
                         __FILE__,__LINE__, tty->driver.name, info->count );
 
        save_flags(flags); cli();
        if (!tty_hung_up_p(filp)) {
                extra_count = 1;
                info->count--;
        }
        restore_flags(flags);
        info->blocked_open++;
 
        while (1) {
                if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
                    (tty->termios->c_cflag & CBAUD)) {
                        spin_lock_irqsave(&info->lock,flags);
                        info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
                        set_signals(info);
                        spin_unlock_irqrestore(&info->lock,flags);
                }
 
                set_current_state(TASK_INTERRUPTIBLE);
 
                if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
                        retval = (info->flags & ASYNC_HUP_NOTIFY) ?
                                        -EAGAIN : -ERESTARTSYS;
                        break;
                }
 
                spin_lock_irqsave(&info->lock,flags);
                get_signals(info);
                spin_unlock_irqrestore(&info->lock,flags);
 
                if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
                    !(info->flags & ASYNC_CLOSING) &&
                    (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
                        break;
                }
 
                if (signal_pending(current)) {
                        retval = -ERESTARTSYS;
                        break;
                }
 
                if (debug_level >= DEBUG_LEVEL_INFO)
                        printk("%s(%d):block_til_ready blocking on %s count=%d\n",
                                 __FILE__,__LINE__, tty->driver.name, info->count );
 
                schedule();
        }
 
        set_current_state(TASK_RUNNING);
        remove_wait_queue(&info->open_wait, &wait);
 
        if (extra_count)
                info->count++;
        info->blocked_open--;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):block_til_ready after blocking on %s count=%d\n",
                         __FILE__,__LINE__, tty->driver.name, info->count );
 
        if (!retval)
                info->flags |= ASYNC_NORMAL_ACTIVE;
 
        return retval;
}
 
static int mgslpc_open(struct tty_struct *tty, struct file * filp)
{
        MGSLPC_INFO     *info;
        int                     retval, line;
        unsigned long flags;
 
        /* verify range of specified line number */
        line = MINOR(tty->device) - tty->driver.minor_start;
        if ((line < 0) || (line >= mgslpc_device_count)) {
                printk("%s(%d):mgslpc_open with illegal line #%d.\n",
                        __FILE__,__LINE__,line);
                return -ENODEV;
        }
 
        /* find the info structure for the specified line */
        info = mgslpc_device_list;
        while(info && info->line != line)
                info = info->next_device;
        if (mgslpc_paranoia_check(info, tty->device, "mgslpc_open"))
                return -ENODEV;
 
        tty->driver_data = info;
        info->tty = tty;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):mgslpc_open(%s), old ref count = %d\n",
                         __FILE__,__LINE__,tty->driver.name, info->count);
 
        MOD_INC_USE_COUNT;
 
        /* If port is closing, signal caller to try again */
        if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
                if (info->flags & ASYNC_CLOSING)
                        interruptible_sleep_on(&info->close_wait);
                retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
                        -EAGAIN : -ERESTARTSYS);
                goto cleanup;
        }
 
        info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 
        spin_lock_irqsave(&info->netlock, flags);
        if (info->netcount) {
                retval = -EBUSY;
                spin_unlock_irqrestore(&info->netlock, flags);
                goto cleanup;
        }
        info->count++;
        spin_unlock_irqrestore(&info->netlock, flags);
 
        if (info->count == 1) {
                /* 1st open on this device, init hardware */
                retval = startup(info);
                if (retval < 0)
                        goto cleanup;
        }
 
        retval = block_til_ready(tty, filp, info);
        if (retval) {
                if (debug_level >= DEBUG_LEVEL_INFO)
                        printk("%s(%d):block_til_ready(%s) returned %d\n",
                                 __FILE__,__LINE__, info->device_name, retval);
                goto cleanup;
        }
 
        if ((info->count == 1) &&
            info->flags & ASYNC_SPLIT_TERMIOS) {
                if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
                        *tty->termios = info->normal_termios;
                else
                        *tty->termios = info->callout_termios;
                mgslpc_change_params(info);
        }
 
        info->session = current->session;
        info->pgrp    = current->pgrp;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):mgslpc_open(%s) success\n",
                         __FILE__,__LINE__, info->device_name);
        retval = 0;
 
cleanup:
        if (retval) {
                if (tty->count == 1)
                        info->tty = 0; /* tty layer will release tty struct */
                if(MOD_IN_USE)
                        MOD_DEC_USE_COUNT;
                if(info->count)
                        info->count--;
        }
 
        return retval;
}
 
/*
 * /proc fs routines....
 */
 
static inline int line_info(char *buf, MGSLPC_INFO *info)
{
        char    stat_buf[30];
        int     ret;
        unsigned long flags;
 
        ret = sprintf(buf, "%s:io:%04X irq:%d",
                      info->device_name, info->io_base, info->irq_level);
 
        /* output current serial signal states */
        spin_lock_irqsave(&info->lock,flags);
        get_signals(info);
        spin_unlock_irqrestore(&info->lock,flags);
 
        stat_buf[0] = 0;
        stat_buf[1] = 0;
        if (info->serial_signals & SerialSignal_RTS)
                strcat(stat_buf, "|RTS");
        if (info->serial_signals & SerialSignal_CTS)
                strcat(stat_buf, "|CTS");
        if (info->serial_signals & SerialSignal_DTR)
                strcat(stat_buf, "|DTR");
        if (info->serial_signals & SerialSignal_DSR)
                strcat(stat_buf, "|DSR");
        if (info->serial_signals & SerialSignal_DCD)
                strcat(stat_buf, "|CD");
        if (info->serial_signals & SerialSignal_RI)
                strcat(stat_buf, "|RI");
 
        if (info->params.mode == MGSL_MODE_HDLC) {
                ret += sprintf(buf+ret, " HDLC txok:%d rxok:%d",
                              info->icount.txok, info->icount.rxok);
                if (info->icount.txunder)
                        ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
                if (info->icount.txabort)
                        ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
                if (info->icount.rxshort)
                        ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
                if (info->icount.rxlong)
                        ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
                if (info->icount.rxover)
                        ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
                if (info->icount.rxcrc)
                        ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxcrc);
        } else {
                ret += sprintf(buf+ret, " ASYNC tx:%d rx:%d",
                              info->icount.tx, info->icount.rx);
                if (info->icount.frame)
                        ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
                if (info->icount.parity)
                        ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
                if (info->icount.brk)
                        ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
                if (info->icount.overrun)
                        ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
        }
 
        /* Append serial signal status to end */
        ret += sprintf(buf+ret, " %s\n", stat_buf+1);
 
        ret += sprintf(buf+ret, "txactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
                       info->tx_active,info->bh_requested,info->bh_running,
                       info->pending_bh);
 
        return ret;
}
 
/* Called to print information about devices
 */
int mgslpc_read_proc(char *page, char **start, off_t off, int count,
                 int *eof, void *data)
{
        int len = 0, l;
        off_t   begin = 0;
        MGSLPC_INFO *info;
 
        len += sprintf(page, "synclink driver:%s\n", driver_version);
 
        info = mgslpc_device_list;
        while( info ) {
                l = line_info(page + len, info);
                len += l;
                if (len+begin > off+count)
                        goto done;
                if (len+begin < off) {
                        begin += len;
                        len = 0;
                }
                info = info->next_device;
        }
 
        *eof = 1;
done:
        if (off >= len+begin)
                return 0;
        *start = page + (off-begin);
        return ((count < begin+len-off) ? count : begin+len-off);
}
 
int rx_alloc_buffers(MGSLPC_INFO *info)
{
        /* each buffer has header and data */
        info->rx_buf_size = sizeof(RXBUF) + info->max_frame_size;
 
        /* calculate total allocation size for 8 buffers */
        info->rx_buf_total_size = info->rx_buf_size * 8;
 
        /* limit total allocated memory */
        if (info->rx_buf_total_size > 0x10000)
                info->rx_buf_total_size = 0x10000;
 
        /* calculate number of buffers */
        info->rx_buf_count = info->rx_buf_total_size / info->rx_buf_size;
 
        info->rx_buf = kmalloc(info->rx_buf_total_size, GFP_KERNEL);
        if (info->rx_buf == NULL)
                return -ENOMEM;
 
        rx_reset_buffers(info);
        return 0;
}
 
void rx_free_buffers(MGSLPC_INFO *info)
{
        if (info->rx_buf)
                kfree(info->rx_buf);
        info->rx_buf = NULL;
}
 
int claim_resources(MGSLPC_INFO *info)
{
        if (rx_alloc_buffers(info) < 0 ) {
                printk( "Cant allocate rx buffer %s\n", info->device_name);
                release_resources(info);
                return -ENODEV;
        }
        return 0;
}
 
void release_resources(MGSLPC_INFO *info)
{
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("release_resources(%s)\n", info->device_name);
        rx_free_buffers(info);
}
 
/* Add the specified device instance data structure to the
 * global linked list of devices and increment the device count.
 *
 * Arguments:           info    pointer to device instance data
 */
void mgslpc_add_device(MGSLPC_INFO *info)
{
        info->next_device = NULL;
        info->line = mgslpc_device_count;
        sprintf(info->device_name,"ttySLP%d",info->line);
 
        if (info->line < MAX_DEVICE_COUNT) {
                if (maxframe[info->line])
                        info->max_frame_size = maxframe[info->line];
                info->dosyncppp = dosyncppp[info->line];
        }
 
        mgslpc_device_count++;
 
        if (!mgslpc_device_list)
                mgslpc_device_list = info;
        else {
                MGSLPC_INFO *current_dev = mgslpc_device_list;
                while( current_dev->next_device )
                        current_dev = current_dev->next_device;
                current_dev->next_device = info;
        }
 
        if (info->max_frame_size < 4096)
                info->max_frame_size = 4096;
        else if (info->max_frame_size > 65535)
                info->max_frame_size = 65535;
 
        printk( "SyncLink PC Card %s:IO=%04X IRQ=%d\n",
                info->device_name, info->io_base, info->irq_level);
 
 
#ifdef CONFIG_SYNCLINK_SYNCPPP
#ifdef MODULE
        if (info->dosyncppp)
#endif
                mgslpc_sppp_init(info);
#endif
}
 
void mgslpc_remove_device(MGSLPC_INFO *remove_info)
{
        MGSLPC_INFO *info = mgslpc_device_list;
        MGSLPC_INFO *last = NULL;
 
        while(info) {
                if (info == remove_info) {
                        if (last)
                                last->next_device = info->next_device;
                        else
                                mgslpc_device_list = info->next_device;
#ifdef CONFIG_SYNCLINK_SYNCPPP
                        if (info->dosyncppp)
                                mgslpc_sppp_delete(info);
#endif
                        release_resources(info);
                        kfree(info);
                        mgslpc_device_count--;
                        return;
                }
                last = info;
                info = info->next_device;
        }
}
 
static int __init synclink_cs_init(void)
{
    servinfo_t serv;
 
    EXPORT_NO_SYMBOLS;
 
    if (break_on_load) {
            mgslpc_get_text_ptr();
            BREAKPOINT();
    }
 
    printk("%s %s\n", driver_name, driver_version);
 
    CardServices(GetCardServicesInfo, &serv);
    if (serv.Revision != CS_RELEASE_CODE) {
            printk(KERN_NOTICE "synclink_cs: Card Services release "
                   "does not match!\n");
            return -1;
    }
    register_pccard_driver(&dev_info, &mgslpc_attach, &mgslpc_detach);
 
    /* Initialize the tty_driver structure */
 
    memset(&serial_driver, 0, sizeof(struct tty_driver));
    serial_driver.magic = TTY_DRIVER_MAGIC;
    serial_driver.driver_name = "synclink_cs";
    serial_driver.name = "ttySLP";
    serial_driver.major = ttymajor;
    serial_driver.minor_start = 64;
    serial_driver.num = MAX_DEVICE_COUNT;
    serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
    serial_driver.subtype = SERIAL_TYPE_NORMAL;
    serial_driver.init_termios = tty_std_termios;
    serial_driver.init_termios.c_cflag =
            B9600 | CS8 | CREAD | HUPCL | CLOCAL;
    serial_driver.flags = TTY_DRIVER_REAL_RAW;
    serial_driver.refcount = &serial_refcount;
    serial_driver.table = serial_table;
    serial_driver.termios = serial_termios;
    serial_driver.termios_locked = serial_termios_locked;
 
    serial_driver.open = mgslpc_open;
    serial_driver.close = mgslpc_close;
    serial_driver.write = mgslpc_write;
    serial_driver.put_char = mgslpc_put_char;
    serial_driver.flush_chars = mgslpc_flush_chars;
    serial_driver.write_room = mgslpc_write_room;
    serial_driver.chars_in_buffer = mgslpc_chars_in_buffer;
    serial_driver.flush_buffer = mgslpc_flush_buffer;
    serial_driver.ioctl = mgslpc_ioctl;
    serial_driver.throttle = mgslpc_throttle;
    serial_driver.unthrottle = mgslpc_unthrottle;
    serial_driver.send_xchar = mgslpc_send_xchar;
    serial_driver.break_ctl = mgslpc_break;
    serial_driver.wait_until_sent = mgslpc_wait_until_sent;
    serial_driver.read_proc = mgslpc_read_proc;
    serial_driver.set_termios = mgslpc_set_termios;
    serial_driver.stop = tx_pause;
    serial_driver.start = tx_release;
    serial_driver.hangup = mgslpc_hangup;
 
    /*
     * The callout device is just like normal device except for
     * major number and the subtype code.
     */
    callout_driver = serial_driver;
    callout_driver.name = "cuaSLP";
    callout_driver.major = cuamajor;
    callout_driver.subtype = SERIAL_TYPE_CALLOUT;
    callout_driver.read_proc = 0;
    callout_driver.proc_entry = 0;
 
    if (tty_register_driver(&serial_driver) < 0)
            printk("%s(%d):Couldn't register serial driver\n",
                   __FILE__,__LINE__);
 
    if (tty_register_driver(&callout_driver) < 0)
            printk("%s(%d):Couldn't register callout driver\n",
                   __FILE__,__LINE__);
 
    printk("%s %s, tty major#%d callout major#%d\n",
           driver_name, driver_version,
           serial_driver.major, callout_driver.major);
 
    return 0;
}
 
static void __exit synclink_cs_exit(void)
{
        unsigned long flags;
        int rc;
 
        printk("Unloading %s: version %s\n", driver_name, driver_version);
 
        while(mgslpc_device_list)
                mgslpc_remove_device(mgslpc_device_list);
 
        save_flags(flags);
        cli();
        if ((rc = tty_unregister_driver(&serial_driver)))
                printk("%s(%d) failed to unregister tty driver err=%d\n",
                       __FILE__,__LINE__,rc);
        if ((rc = tty_unregister_driver(&callout_driver)))
                printk("%s(%d) failed to unregister callout driver err=%d\n",
                       __FILE__,__LINE__,rc);
        restore_flags(flags);
 
        unregister_pccard_driver(&dev_info);
        while (dev_list != NULL) {
                del_timer(&dev_list->release);
                if (dev_list->state & DEV_CONFIG)
                        mgslpc_release((u_long)dev_list);
                mgslpc_detach(dev_list);
        }
}
 
module_init(synclink_cs_init);
module_exit(synclink_cs_exit);
 
void mgslpc_set_rate(MGSLPC_INFO *info, unsigned char channel, unsigned int rate)
{
        unsigned int M, N;
        unsigned char val;
 
        /* note:standard BRG mode is broken in V3.2 chip
         * so enhanced mode is always used
         */
 
        if (rate) {
                N = 3686400 / rate;
                if (!N)
                        N = 1;
                N >>= 1;
                for (M = 1; N > 64 && M < 16; M++)
                        N >>= 1;
                N--;
 
                /* BGR[5..0] = N
                 * BGR[9..6] = M
                 * BGR[7..0] contained in BGR register
                 * BGR[9..8] contained in CCR2[7..6]
                 * divisor = (N+1)*2^M
                 *
                 * Note: M *must* not be zero (causes asymetric duty cycle)
                 */
                write_reg(info, (unsigned char) (channel + BGR),
                                  (unsigned char) ((M << 6) + N));
                val = read_reg(info, (unsigned char) (channel + CCR2)) & 0x3f;
                val |= ((M << 4) & 0xc0);
                write_reg(info, (unsigned char) (channel + CCR2), val);
        }
}
 
/* Enabled the AUX clock output at the specified frequency.
 */
void enable_auxclk(MGSLPC_INFO *info)
{
        unsigned char val;
 
        /* MODE
         *
         * 07..06  MDS[1..0] 10 = transparent HDLC mode
         * 05      ADM Address Mode, 0 = no addr recognition
         * 04      TMD Timer Mode, 0 = external
         * 03      RAC Receiver Active, 0 = inactive
         * 02      RTS 0=RTS active during xmit, 1=RTS always active
         * 01      TRS Timer Resolution, 1=512
         * 00      TLP Test Loop, 0 = no loop
         *
         * 1000 0010
         */
        val = 0x82;
 
        /* channel B RTS is used to enable AUXCLK driver on SP505 */
        if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
                val |= BIT2;
        write_reg(info, CHB + MODE, val);
 
        /* CCR0
         *
         * 07      PU Power Up, 1=active, 0=power down
         * 06      MCE Master Clock Enable, 1=enabled
         * 05      Reserved, 0
         * 04..02  SC[2..0] Encoding
         * 01..00  SM[1..0] Serial Mode, 00=HDLC
         *
         * 11000000
         */
        write_reg(info, CHB + CCR0, 0xc0);
 
        /* CCR1
         *
         * 07      SFLG Shared Flag, 0 = disable shared flags
         * 06      GALP Go Active On Loop, 0 = not used
         * 05      GLP Go On Loop, 0 = not used
         * 04      ODS Output Driver Select, 1=TxD is push-pull output
         * 03      ITF Interframe Time Fill, 0=mark, 1=flag
         * 02..00  CM[2..0] Clock Mode
         *
         * 0001 0111
         */
        write_reg(info, CHB + CCR1, 0x17);
 
        /* CCR2 (Channel B)
         *
         * 07..06  BGR[9..8] Baud rate bits 9..8
         * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
         * 04      SSEL Clock source select, 1=submode b
         * 03      TOE 0=TxCLK is input, 1=TxCLK is output
         * 02      RWX Read/Write Exchange 0=disabled
         * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
         * 00      DIV, data inversion 0=disabled, 1=enabled
         *
         * 0011 1000
         */
        if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
                write_reg(info, CHB + CCR2, 0x38);
        else
                write_reg(info, CHB + CCR2, 0x30);
 
        /* CCR4
         *
         * 07      MCK4 Master Clock Divide by 4, 1=enabled
         * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
         * 05      TST1 Test Pin, 0=normal operation
         * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
         * 03..02  Reserved, must be 0
         * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
         *
         * 0101 0000
         */
        write_reg(info, CHB + CCR4, 0x50);
 
        /* if auxclk not enabled, set internal BRG so
         * CTS transitions can be detected (requires TxC)
         */
        if (info->params.mode == MGSL_MODE_HDLC && info->params.clock_speed)
                mgslpc_set_rate(info, CHB, info->params.clock_speed);
        else
                mgslpc_set_rate(info, CHB, 921600);
}
 
static void loopback_enable(MGSLPC_INFO *info)
{
        unsigned char val;
 
        /* CCR1:02..00  CM[2..0] Clock Mode = 111 (clock mode 7) */
        val = read_reg(info, CHA + CCR1) | (BIT2 + BIT1 + BIT0);
        write_reg(info, CHA + CCR1, val);
 
        /* CCR2:04 SSEL Clock source select, 1=submode b */
        val = read_reg(info, CHA + CCR2) | (BIT4 + BIT5);
        write_reg(info, CHA + CCR2, val);
 
        /* set LinkSpeed if available, otherwise default to 2Mbps */
        if (info->params.clock_speed)
                mgslpc_set_rate(info, CHA, info->params.clock_speed);
        else
                mgslpc_set_rate(info, CHA, 1843200);
 
        /* MODE:00 TLP Test Loop, 1=loopback enabled */
        val = read_reg(info, CHA + MODE) | BIT0;
        write_reg(info, CHA + MODE, val);
}
 
void hdlc_mode(MGSLPC_INFO *info)
{
        unsigned char val;
        unsigned char clkmode, clksubmode;
 
        /* disable all interrupts */
        irq_disable(info, CHA, 0xffff);
        irq_disable(info, CHB, 0xffff);
        port_irq_disable(info, 0xff);
 
        /* assume clock mode 0a, rcv=RxC xmt=TxC */
        clkmode = clksubmode = 0;
        if (info->params.flags & HDLC_FLAG_RXC_DPLL
            && info->params.flags & HDLC_FLAG_TXC_DPLL) {
                /* clock mode 7a, rcv = DPLL, xmt = DPLL */
                clkmode = 7;
        } else if (info->params.flags & HDLC_FLAG_RXC_BRG
                 && info->params.flags & HDLC_FLAG_TXC_BRG) {
                /* clock mode 7b, rcv = BRG, xmt = BRG */
                clkmode = 7;
                clksubmode = 1;
        } else if (info->params.flags & HDLC_FLAG_RXC_DPLL) {
                if (info->params.flags & HDLC_FLAG_TXC_BRG) {
                        /* clock mode 6b, rcv = DPLL, xmt = BRG/16 */
                        clkmode = 6;
                        clksubmode = 1;
                } else {
                        /* clock mode 6a, rcv = DPLL, xmt = TxC */
                        clkmode = 6;
                }
        } else if (info->params.flags & HDLC_FLAG_TXC_BRG) {
                /* clock mode 0b, rcv = RxC, xmt = BRG */
                clksubmode = 1;
        }
 
        /* MODE
         *
         * 07..06  MDS[1..0] 10 = transparent HDLC mode
         * 05      ADM Address Mode, 0 = no addr recognition
         * 04      TMD Timer Mode, 0 = external
         * 03      RAC Receiver Active, 0 = inactive
         * 02      RTS 0=RTS active during xmit, 1=RTS always active
         * 01      TRS Timer Resolution, 1=512
         * 00      TLP Test Loop, 0 = no loop
         *
         * 1000 0010
         */
        val = 0x82;
        if (info->params.loopback)
                val |= BIT0;
 
        /* preserve RTS state */
        if (info->serial_signals & SerialSignal_RTS)
                val |= BIT2;
        write_reg(info, CHA + MODE, val);
 
        /* CCR0
         *
         * 07      PU Power Up, 1=active, 0=power down
         * 06      MCE Master Clock Enable, 1=enabled
         * 05      Reserved, 0
         * 04..02  SC[2..0] Encoding
         * 01..00  SM[1..0] Serial Mode, 00=HDLC
         *
         * 11000000
         */
        val = 0xc0;
        switch (info->params.encoding)
        {
        case HDLC_ENCODING_NRZI:
                val |= BIT3;
                break;
        case HDLC_ENCODING_BIPHASE_SPACE:
                val |= BIT4;
                break;          // FM0
        case HDLC_ENCODING_BIPHASE_MARK:
                val |= BIT4 + BIT2;
                break;          // FM1
        case HDLC_ENCODING_BIPHASE_LEVEL:
                val |= BIT4 + BIT3;
                break;          // Manchester
        }
        write_reg(info, CHA + CCR0, val);
 
        /* CCR1
         *
         * 07      SFLG Shared Flag, 0 = disable shared flags
         * 06      GALP Go Active On Loop, 0 = not used
         * 05      GLP Go On Loop, 0 = not used
         * 04      ODS Output Driver Select, 1=TxD is push-pull output
         * 03      ITF Interframe Time Fill, 0=mark, 1=flag
         * 02..00  CM[2..0] Clock Mode
         *
         * 0001 0000
         */
        val = 0x10 + clkmode;
        write_reg(info, CHA + CCR1, val);
 
        /* CCR2
         *
         * 07..06  BGR[9..8] Baud rate bits 9..8
         * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
         * 04      SSEL Clock source select, 1=submode b
         * 03      TOE 0=TxCLK is input, 0=TxCLK is input
         * 02      RWX Read/Write Exchange 0=disabled
         * 01      C32, CRC select, 0=CRC-16, 1=CRC-32
         * 00      DIV, data inversion 0=disabled, 1=enabled
         *
         * 0000 0000
         */
        val = 0x00;
        if (clkmode == 2 || clkmode == 3 || clkmode == 6
            || clkmode == 7 || (clkmode == 0 && clksubmode == 1))
                val |= BIT5;
        if (clksubmode)
                val |= BIT4;
        if (info->params.crc_type == HDLC_CRC_32_CCITT)
                val |= BIT1;
        if (info->params.encoding == HDLC_ENCODING_NRZB)
                val |= BIT0;
        write_reg(info, CHA + CCR2, val);
 
        /* CCR3
         *
         * 07..06  PRE[1..0] Preamble count 00=1, 01=2, 10=4, 11=8
         * 05      EPT Enable preamble transmission, 1=enabled
         * 04      RADD Receive address pushed to FIFO, 0=disabled
         * 03      CRL CRC Reset Level, 0=FFFF
         * 02      RCRC Rx CRC 0=On 1=Off
         * 01      TCRC Tx CRC 0=On 1=Off
         * 00      PSD DPLL Phase Shift Disable
         *
         * 0000 0000
         */
        val = 0x00;
        if (info->params.crc_type == HDLC_CRC_NONE)
                val |= BIT2 + BIT1;
        if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
                val |= BIT5;
        switch (info->params.preamble_length)
        {
        case HDLC_PREAMBLE_LENGTH_16BITS:
                val |= BIT6;
                break;
        case HDLC_PREAMBLE_LENGTH_32BITS:
                val |= BIT6;
                break;
        case HDLC_PREAMBLE_LENGTH_64BITS:
                val |= BIT7 + BIT6;
                break;
        }
        write_reg(info, CHA + CCR3, val);
 
        /* PRE - Preamble pattern */
        val = 0;
        switch (info->params.preamble)
        {
        case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
        case HDLC_PREAMBLE_PATTERN_10:    val = 0xaa; break;
        case HDLC_PREAMBLE_PATTERN_01:    val = 0x55; break;
        case HDLC_PREAMBLE_PATTERN_ONES:  val = 0xff; break;
        }
        write_reg(info, CHA + PRE, val);
 
        /* CCR4
         *
         * 07      MCK4 Master Clock Divide by 4, 1=enabled
         * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
         * 05      TST1 Test Pin, 0=normal operation
         * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
         * 03..02  Reserved, must be 0
         * 01..00  RFT[1..0] RxFIFO Threshold 00=32 bytes
         *
         * 0101 0000
         */
        val = 0x50;
        write_reg(info, CHA + CCR4, val);
        if (info->params.flags & HDLC_FLAG_RXC_DPLL)
                mgslpc_set_rate(info, CHA, info->params.clock_speed * 16);
        else
                mgslpc_set_rate(info, CHA, info->params.clock_speed);
 
        /* RLCR Receive length check register
         *
         * 7     1=enable receive length check
         * 6..0  Max frame length = (RL + 1) * 32
         */
        write_reg(info, CHA + RLCR, 0);
 
        /* XBCH Transmit Byte Count High
         *
         * 07      DMA mode, 0 = interrupt driven
         * 06      NRM, 0=ABM (ignored)
         * 05      CAS Carrier Auto Start
         * 04      XC Transmit Continuously (ignored)
         * 03..00  XBC[10..8] Transmit byte count bits 10..8
         *
         * 0000 0000
         */
        val = 0x00;
        if (info->params.flags & HDLC_FLAG_AUTO_DCD)
                val |= BIT5;
        write_reg(info, CHA + XBCH, val);
        enable_auxclk(info);
        if (info->params.loopback || info->testing_irq)
                loopback_enable(info);
        if (info->params.flags & HDLC_FLAG_AUTO_CTS)
        {
                irq_enable(info, CHB, IRQ_CTS);
                /* PVR[3] 1=AUTO CTS active */
                set_reg_bits(info, CHA + PVR, BIT3);
        } else
                clear_reg_bits(info, CHA + PVR, BIT3);
 
        irq_enable(info, CHA,
                         IRQ_RXEOM + IRQ_RXFIFO + IRQ_ALLSENT +
                         IRQ_UNDERRUN + IRQ_TXFIFO);
        issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
        wait_command_complete(info, CHA);
        read_reg16(info, CHA + ISR);    /* clear pending IRQs */
 
        /* Master clock mode enabled above to allow reset commands
         * to complete even if no data clocks are present.
         *
         * Disable master clock mode for normal communications because
         * V3.2 of the ESCC2 has a bug that prevents the transmit all sent
         * IRQ when in master clock mode.
         *
         * Leave master clock mode enabled for IRQ test because the
         * timer IRQ used by the test can only happen in master clock mode.
         */
        if (!info->testing_irq)
                clear_reg_bits(info, CHA + CCR0, BIT6);
 
        tx_set_idle(info);
 
        tx_stop(info);
        rx_stop(info);
}
 
void rx_stop(MGSLPC_INFO *info)
{
        if (debug_level >= DEBUG_LEVEL_ISR)
                printk("%s(%d):rx_stop(%s)\n",
                         __FILE__,__LINE__, info->device_name );
 
        /* MODE:03 RAC Receiver Active, 0=inactive */
        clear_reg_bits(info, CHA + MODE, BIT3);
 
        info->rx_enabled = 0;
        info->rx_overflow = 0;
}
 
void rx_start(MGSLPC_INFO *info)
{
        if (debug_level >= DEBUG_LEVEL_ISR)
                printk("%s(%d):rx_start(%s)\n",
                         __FILE__,__LINE__, info->device_name );
 
        rx_reset_buffers(info);
        info->rx_enabled = 0;
        info->rx_overflow = 0;
 
        /* MODE:03 RAC Receiver Active, 1=active */
        set_reg_bits(info, CHA + MODE, BIT3);
 
        info->rx_enabled = 1;
}
 
void tx_start(MGSLPC_INFO *info)
{
        if (debug_level >= DEBUG_LEVEL_ISR)
                printk("%s(%d):tx_start(%s)\n",
                         __FILE__,__LINE__, info->device_name );
 
        if (info->tx_count) {
                /* If auto RTS enabled and RTS is inactive, then assert */
                /* RTS and set a flag indicating that the driver should */
                /* negate RTS when the transmission completes. */
                info->drop_rts_on_tx_done = 0;
 
                if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
                        get_signals(info);
                        if (!(info->serial_signals & SerialSignal_RTS)) {
                                info->serial_signals |= SerialSignal_RTS;
                                set_signals(info);
                                info->drop_rts_on_tx_done = 1;
                        }
                }
 
                if (info->params.mode == MGSL_MODE_ASYNC) {
                        if (!info->tx_active) {
                                info->tx_active = 1;
                                tx_ready(info);
                        }
                } else {
                        info->tx_active = 1;
                        tx_ready(info);
                        info->tx_timer.expires = jiffies + jiffies_from_ms(5000);
                        add_timer(&info->tx_timer);
                }
        }
 
        if (!info->tx_enabled)
                info->tx_enabled = 1;
}
 
void tx_stop(MGSLPC_INFO *info)
{
        if (debug_level >= DEBUG_LEVEL_ISR)
                printk("%s(%d):tx_stop(%s)\n",
                         __FILE__,__LINE__, info->device_name );
 
        del_timer(&info->tx_timer);
 
        info->tx_enabled = 0;
        info->tx_active  = 0;
}
 
/* Reset the adapter to a known state and prepare it for further use.
 */
void reset_device(MGSLPC_INFO *info)
{
        /* power up both channels (set BIT7) */
        write_reg(info, CHA + CCR0, 0x80);
        write_reg(info, CHB + CCR0, 0x80);
        write_reg(info, CHA + MODE, 0);
        write_reg(info, CHB + MODE, 0);
 
        /* disable all interrupts */
        irq_disable(info, CHA, 0xffff);
        irq_disable(info, CHB, 0xffff);
        port_irq_disable(info, 0xff);
 
        /* PCR Port Configuration Register
         *
         * 07..04  DEC[3..0] Serial I/F select outputs
         * 03      output, 1=AUTO CTS control enabled
         * 02      RI Ring Indicator input 0=active
         * 01      DSR input 0=active
         * 00      DTR output 0=active
         *
         * 0000 0110
         */
        write_reg(info, PCR, 0x06);
 
        /* PVR Port Value Register
         *
         * 07..04  DEC[3..0] Serial I/F select (0000=disabled)
         * 03      AUTO CTS output 1=enabled
         * 02      RI Ring Indicator input
         * 01      DSR input
         * 00      DTR output (1=inactive)
         *
         * 0000 0001
         */
//      write_reg(info, PVR, PVR_DTR);
 
        /* IPC Interrupt Port Configuration
         *
         * 07      VIS 1=Masked interrupts visible
         * 06..05  Reserved, 0
         * 04..03  SLA Slave address, 00 ignored
         * 02      CASM Cascading Mode, 1=daisy chain
         * 01..00  IC[1..0] Interrupt Config, 01=push-pull output, active low
         *
         * 0000 0101
         */
        write_reg(info, IPC, 0x05);
}
 
void async_mode(MGSLPC_INFO *info)
{
        unsigned char val;
 
        /* disable all interrupts */
        irq_disable(info, CHA, 0xffff);
        irq_disable(info, CHB, 0xffff);
        port_irq_disable(info, 0xff);
 
        /* MODE
         *
         * 07      Reserved, 0
         * 06      FRTS RTS State, 0=active
         * 05      FCTS Flow Control on CTS
         * 04      FLON Flow Control Enable
         * 03      RAC Receiver Active, 0 = inactive
         * 02      RTS 0=Auto RTS, 1=manual RTS
         * 01      TRS Timer Resolution, 1=512
         * 00      TLP Test Loop, 0 = no loop
         *
         * 0000 0110
         */
        val = 0x06;
        if (info->params.loopback)
                val |= BIT0;
 
        /* preserve RTS state */
        if (!(info->serial_signals & SerialSignal_RTS))
                val |= BIT6;
        write_reg(info, CHA + MODE, val);
 
        /* CCR0
         *
         * 07      PU Power Up, 1=active, 0=power down
         * 06      MCE Master Clock Enable, 1=enabled
         * 05      Reserved, 0
         * 04..02  SC[2..0] Encoding, 000=NRZ
         * 01..00  SM[1..0] Serial Mode, 11=Async
         *
         * 1000 0011
         */
        write_reg(info, CHA + CCR0, 0x83);
 
        /* CCR1
         *
         * 07..05  Reserved, 0
         * 04      ODS Output Driver Select, 1=TxD is push-pull output
         * 03      BCR Bit Clock Rate, 1=16x
         * 02..00  CM[2..0] Clock Mode, 111=BRG
         *
         * 0001 1111
         */
        write_reg(info, CHA + CCR1, 0x1f);
 
        /* CCR2 (channel A)
         *
         * 07..06  BGR[9..8] Baud rate bits 9..8
         * 05      BDF Baud rate divisor factor, 0=1, 1=BGR value
         * 04      SSEL Clock source select, 1=submode b
         * 03      TOE 0=TxCLK is input, 0=TxCLK is input
         * 02      RWX Read/Write Exchange 0=disabled
         * 01      Reserved, 0
         * 00      DIV, data inversion 0=disabled, 1=enabled
         *
         * 0001 0000
         */
        write_reg(info, CHA + CCR2, 0x10);
 
        /* CCR3
         *
         * 07..01  Reserved, 0
         * 00      PSD DPLL Phase Shift Disable
         *
         * 0000 0000
         */
        write_reg(info, CHA + CCR3, 0);
 
        /* CCR4
         *
         * 07      MCK4 Master Clock Divide by 4, 1=enabled
         * 06      EBRG Enhanced Baud Rate Generator Mode, 1=enabled
         * 05      TST1 Test Pin, 0=normal operation
         * 04      ICD Ivert Carrier Detect, 1=enabled (active low)
         * 03..00  Reserved, must be 0
         *
         * 0101 0000
         */
        write_reg(info, CHA + CCR4, 0x50);
        mgslpc_set_rate(info, CHA, info->params.data_rate * 16);
 
        /* DAFO Data Format
         *
         * 07      Reserved, 0
         * 06      XBRK transmit break, 0=normal operation
         * 05      Stop bits (0=1, 1=2)
         * 04..03  PAR[1..0] Parity (01=odd, 10=even)
         * 02      PAREN Parity Enable
         * 01..00  CHL[1..0] Character Length (00=8, 01=7)
         *
         */
        val = 0x00;
        if (info->params.data_bits != 8)
                val |= BIT0;    /* 7 bits */
        if (info->params.stop_bits != 1)
                val |= BIT5;
        if (info->params.parity != ASYNC_PARITY_NONE)
        {
                val |= BIT2;    /* Parity enable */
                if (info->params.parity == ASYNC_PARITY_ODD)
                        val |= BIT3;
                else
                        val |= BIT4;
        }
        write_reg(info, CHA + DAFO, val);
 
        /* RFC Rx FIFO Control
         *
         * 07      Reserved, 0
         * 06      DPS, 1=parity bit not stored in data byte
         * 05      DXS, 0=all data stored in FIFO (including XON/XOFF)
         * 04      RFDF Rx FIFO Data Format, 1=status byte stored in FIFO
         * 03..02  RFTH[1..0], rx threshold, 11=16 status + 16 data byte
         * 01      Reserved, 0
         * 00      TCDE Terminate Char Detect Enable, 0=disabled
         *
         * 0101 1100
         */
        write_reg(info, CHA + RFC, 0x5c);
 
        /* RLCR Receive length check register
         *
         * Max frame length = (RL + 1) * 32
         */
        write_reg(info, CHA + RLCR, 0);
 
        /* XBCH Transmit Byte Count High
         *
         * 07      DMA mode, 0 = interrupt driven
         * 06      NRM, 0=ABM (ignored)
         * 05      CAS Carrier Auto Start
         * 04      XC Transmit Continuously (ignored)
         * 03..00  XBC[10..8] Transmit byte count bits 10..8
         *
         * 0000 0000
         */
        val = 0x00;
        if (info->params.flags & HDLC_FLAG_AUTO_DCD)
                val |= BIT5;
        write_reg(info, CHA + XBCH, val);
        if (info->params.flags & HDLC_FLAG_AUTO_CTS)
                irq_enable(info, CHA, IRQ_CTS);
 
        /* MODE:03 RAC Receiver Active, 1=active */
        set_reg_bits(info, CHA + MODE, BIT3);
        enable_auxclk(info);
        if (info->params.flags & HDLC_FLAG_AUTO_CTS) {
                irq_enable(info, CHB, IRQ_CTS);
                /* PVR[3] 1=AUTO CTS active */
                set_reg_bits(info, CHA + PVR, BIT3);
        } else
                clear_reg_bits(info, CHA + PVR, BIT3);
        irq_enable(info, CHA,
                          IRQ_RXEOM + IRQ_RXFIFO + IRQ_BREAK_ON + IRQ_RXTIME +
                          IRQ_ALLSENT + IRQ_TXFIFO);
        issue_command(info, CHA, CMD_TXRESET + CMD_RXRESET);
        wait_command_complete(info, CHA);
        read_reg16(info, CHA + ISR);    /* clear pending IRQs */
}
 
/* Set the HDLC idle mode for the transmitter.
 */
void tx_set_idle(MGSLPC_INFO *info)
{
        /* Note: ESCC2 only supports flags and one idle modes */
        if (info->idle_mode == HDLC_TXIDLE_FLAGS)
                set_reg_bits(info, CHA + CCR1, BIT3);
        else
                clear_reg_bits(info, CHA + CCR1, BIT3);
}
 
/* get state of the V24 status (input) signals.
 */
void get_signals(MGSLPC_INFO *info)
{
        unsigned char status = 0;
 
        /* preserve DTR and RTS */
        info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
 
        if (read_reg(info, CHB + VSTR) & BIT7)
                info->serial_signals |= SerialSignal_DCD;
        if (read_reg(info, CHB + STAR) & BIT1)
                info->serial_signals |= SerialSignal_CTS;
 
        status = read_reg(info, CHA + PVR);
        if (!(status & PVR_RI))
                info->serial_signals |= SerialSignal_RI;
        if (!(status & PVR_DSR))
                info->serial_signals |= SerialSignal_DSR;
}
 
/* Set the state of DTR and RTS based on contents of
 * serial_signals member of device extension.
 */
void set_signals(MGSLPC_INFO *info)
{
        unsigned char val;
 
        val = read_reg(info, CHA + MODE);
        if (info->params.mode == MGSL_MODE_ASYNC) {
                if (info->serial_signals & SerialSignal_RTS)
                        val &= ~BIT6;
                else
                        val |= BIT6;
        } else {
                if (info->serial_signals & SerialSignal_RTS)
                        val |= BIT2;
                else
                        val &= ~BIT2;
        }
        write_reg(info, CHA + MODE, val);
 
        if (info->serial_signals & SerialSignal_DTR)
                clear_reg_bits(info, CHA + PVR, PVR_DTR);
        else
                set_reg_bits(info, CHA + PVR, PVR_DTR);
}
 
void rx_reset_buffers(MGSLPC_INFO *info)
{
        RXBUF *buf;
        int i;
 
        info->rx_put = 0;
        info->rx_get = 0;
        info->rx_frame_count = 0;
        for (i=0 ; i < info->rx_buf_count ; i++) {
                buf = (RXBUF*)(info->rx_buf + (i * info->rx_buf_size));
                buf->status = buf->count = 0;
        }
}
 
/* Attempt to return a received HDLC frame
 * Only frames received without errors are returned.
 *
 * Returns 1 if frame returned, otherwise 0
 */
int rx_get_frame(MGSLPC_INFO *info)
{
        unsigned short status;
        RXBUF *buf;
        unsigned int framesize = 0;
        unsigned long flags;
        struct tty_struct *tty = info->tty;
        int return_frame = 0;
 
        if (info->rx_frame_count == 0)
                return 0;
 
        buf = (RXBUF*)(info->rx_buf + (info->rx_get * info->rx_buf_size));
 
        status = buf->status;
 
        /* 07  VFR  1=valid frame
         * 06  RDO  1=data overrun
         * 05  CRC  1=OK, 0=error
         * 04  RAB  1=frame aborted
         */
        if ((status & 0xf0) != 0xA0) {
                if (!(status & BIT7) || (status & BIT4))
                        info->icount.rxabort++;
                else if (status & BIT6)
                        info->icount.rxover++;
                else if (!(status & BIT5)) {
                        info->icount.rxcrc++;
                        if (info->params.crc_type & HDLC_CRC_RETURN_EX)
                                return_frame = 1;
                }
                framesize = 0;
#ifdef CONFIG_SYNCLINK_SYNCPPP
                info->netstats.rx_errors++;
                info->netstats.rx_frame_errors++;
#endif
        } else
                return_frame = 1;
 
        if (return_frame)
                framesize = buf->count;
 
        if (debug_level >= DEBUG_LEVEL_BH)
                printk("%s(%d):rx_get_frame(%s) status=%04X size=%d\n",
                        __FILE__,__LINE__,info->device_name,status,framesize);
 
        if (debug_level >= DEBUG_LEVEL_DATA)
                trace_block(info, buf->data, framesize, 0);
 
        if (framesize) {
                if ((info->params.crc_type & HDLC_CRC_RETURN_EX &&
                      framesize+1 > info->max_frame_size) ||
                    framesize > info->max_frame_size)
                        info->icount.rxlong++;
                else {
                        if (status & BIT5)
                                info->icount.rxok++;
 
                        if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
                                *(buf->data + framesize) = status & BIT5 ? RX_OK:RX_CRC_ERROR;
                                ++framesize;
                        }
 
#ifdef CONFIG_SYNCLINK_SYNCPPP
                        if (info->netcount) {
                                /* pass frame to syncppp device */
                                mgslpc_sppp_rx_done(info, buf->data, framesize);
                        }
                        else
#endif
                        {
                                /* Call the line discipline receive callback directly. */
                                if (tty && tty->ldisc.receive_buf)
                                        tty->ldisc.receive_buf(tty, buf->data, info->flag_buf, framesize);
                        }
                }
        }
 
        spin_lock_irqsave(&info->lock,flags);
        buf->status = buf->count = 0;
        info->rx_frame_count--;
        info->rx_get++;
        if (info->rx_get >= info->rx_buf_count)
                info->rx_get = 0;
        spin_unlock_irqrestore(&info->lock,flags);
 
        return 1;
}
 
BOOLEAN register_test(MGSLPC_INFO *info)
{
        static unsigned char patterns[] =
            { 0x00, 0xff, 0xaa, 0x55, 0x69, 0x96, 0x0f };
        static unsigned int count = sizeof(patterns) / sizeof(patterns[0]);
        unsigned int i;
        BOOLEAN rc = TRUE;
        unsigned long flags;
 
        spin_lock_irqsave(&info->lock,flags);
        reset_device(info);
 
        for (i = 0; i < count; i++) {
                write_reg(info, XAD1, patterns[i]);
                write_reg(info, XAD2, patterns[(i + 1) % count]);
                if ((read_reg(info, XAD1) != patterns[i]) ||
                    (read_reg(info, XAD2) != patterns[(i + 1) % count])) {
                        rc = FALSE;
                        break;
                }
        }
 
        spin_unlock_irqrestore(&info->lock,flags);
        return rc;
}
 
BOOLEAN irq_test(MGSLPC_INFO *info)
{
        unsigned long end_time;
        unsigned long flags;
 
        spin_lock_irqsave(&info->lock,flags);
        reset_device(info);
 
        info->testing_irq = TRUE;
        hdlc_mode(info);
 
        info->irq_occurred = FALSE;
 
        /* init hdlc mode */
 
        irq_enable(info, CHA, IRQ_TIMER);
        write_reg(info, CHA + TIMR, 0);  /* 512 cycles */
        issue_command(info, CHA, CMD_START_TIMER);
 
        spin_unlock_irqrestore(&info->lock,flags);
 
        end_time=100;
        while(end_time-- && !info->irq_occurred) {
                set_current_state(TASK_INTERRUPTIBLE);
                schedule_timeout(jiffies_from_ms(10));
        }
 
        info->testing_irq = FALSE;
 
        spin_lock_irqsave(&info->lock,flags);
        reset_device(info);
        spin_unlock_irqrestore(&info->lock,flags);
 
        return info->irq_occurred ? TRUE : FALSE;
}
 
int adapter_test(MGSLPC_INFO *info)
{
        if (!register_test(info)) {
                info->init_error = DiagStatus_AddressFailure;
                printk( "%s(%d):Register test failure for device %s Addr=%04X\n",
                        __FILE__,__LINE__,info->device_name, (unsigned short)(info->io_base) );
                return -ENODEV;
        }
 
        if (!irq_test(info)) {
                info->init_error = DiagStatus_IrqFailure;
                printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
                        __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
                return -ENODEV;
        }
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):device %s passed diagnostics\n",
                        __FILE__,__LINE__,info->device_name);
        return 0;
}
 
void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit)
{
        int i;
        int linecount;
        if (xmit)
                printk("%s tx data:\n",info->device_name);
        else
                printk("%s rx data:\n",info->device_name);
 
        while(count) {
                if (count > 16)
                        linecount = 16;
                else
                        linecount = count;
 
                for(i=0;i<linecount;i++)
                        printk("%02X ",(unsigned char)data[i]);
                for(;i<17;i++)
                        printk("   ");
                for(i=0;i<linecount;i++) {
                        if (data[i]>=040 && data[i]<=0176)
                                printk("%c",data[i]);
                        else
                                printk(".");
                }
                printk("\n");
 
                data  += linecount;
                count -= linecount;
        }
}
 
/* HDLC frame time out
 * update stats and do tx completion processing
 */
void tx_timeout(unsigned long context)
{
        MGSLPC_INFO *info = (MGSLPC_INFO*)context;
        unsigned long flags;
 
        if ( debug_level >= DEBUG_LEVEL_INFO )
                printk( "%s(%d):tx_timeout(%s)\n",
                        __FILE__,__LINE__,info->device_name);
        if(info->tx_active &&
           info->params.mode == MGSL_MODE_HDLC) {
                info->icount.txtimeout++;
        }
        spin_lock_irqsave(&info->lock,flags);
        info->tx_active = 0;
        info->tx_count = info->tx_put = info->tx_get = 0;
 
        spin_unlock_irqrestore(&info->lock,flags);
 
#ifdef CONFIG_SYNCLINK_SYNCPPP
        if (info->netcount)
                mgslpc_sppp_tx_done(info);
        else
#endif
                bh_transmit(info);
}
 
#ifdef CONFIG_SYNCLINK_SYNCPPP
/* syncppp net device routines
 */
 
void mgslpc_sppp_init(MGSLPC_INFO *info)
{
        struct net_device *d;
 
        sprintf(info->netname,"mgslp%d",info->line);
 
        info->if_ptr = &info->pppdev;
        info->netdev = info->pppdev.dev = &info->netdevice;
 
        sppp_attach(&info->pppdev);
 
        d = info->netdev;
        strcpy(d->name,info->netname);
        d->base_addr = info->io_base;
        d->irq = info->irq_level;
        d->priv = info;
        d->init = NULL;
        d->open = mgslpc_sppp_open;
        d->stop = mgslpc_sppp_close;
        d->hard_start_xmit = mgslpc_sppp_tx;
        d->do_ioctl = mgslpc_sppp_ioctl;
        d->get_stats = mgslpc_net_stats;
        d->tx_timeout = mgslpc_sppp_tx_timeout;
        d->watchdog_timeo = 10*HZ;
 
#if LINUX_VERSION_CODE < VERSION(2,4,4) 
        dev_init_buffers(d);
#endif
 
        if (register_netdev(d) == -1) {
                printk(KERN_WARNING "%s: register_netdev failed.\n", d->name);
                sppp_detach(info->netdev);
                return;
        }
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("mgslpc_sppp_init()\n");
}
 
void mgslpc_sppp_delete(MGSLPC_INFO *info)
{
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("mgslpc_sppp_delete(%s)\n",info->netname);
        sppp_detach(info->netdev);
        unregister_netdev(info->netdev);
}
 
int mgslpc_sppp_open(struct net_device *d)
{
        MGSLPC_INFO *info = d->priv;
        int err, flags;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("mgslpc_sppp_open(%s)\n",info->netname);
 
        spin_lock_irqsave(&info->netlock, flags);
        if (info->count != 0 || info->netcount != 0) {
                printk(KERN_WARNING "%s: sppp_open returning busy\n", info->netname);
                spin_unlock_irqrestore(&info->netlock, flags);
                return -EBUSY;
        }
        info->netcount=1;
        MOD_INC_USE_COUNT;
        spin_unlock_irqrestore(&info->netlock, flags);
 
        /* claim resources and init adapter */
        if ((err = startup(info)) != 0)
                goto open_fail;
 
        /* allow syncppp module to do open processing */
        if ((err = sppp_open(d)) != 0) {
                shutdown(info);
                goto open_fail;
        }
 
        info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
        mgslpc_program_hw(info);
 
        d->trans_start = jiffies;
        netif_start_queue(d);
        return 0;
 
open_fail:
        spin_lock_irqsave(&info->netlock, flags);
        info->netcount=0;
        MOD_DEC_USE_COUNT;
        spin_unlock_irqrestore(&info->netlock, flags);
        return err;
}
 
void mgslpc_sppp_tx_timeout(struct net_device *dev)
{
        MGSLPC_INFO *info = dev->priv;
        int flags;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("mgslpc_sppp_tx_timeout(%s)\n",info->netname);
 
        info->netstats.tx_errors++;
        info->netstats.tx_aborted_errors++;
 
        spin_lock_irqsave(&info->lock,flags);
        tx_stop(info);
        spin_unlock_irqrestore(&info->lock,flags);
 
        netif_wake_queue(dev);
}
 
int mgslpc_sppp_tx(struct sk_buff *skb, struct net_device *dev)
{
        MGSLPC_INFO *info = dev->priv;
        unsigned long flags;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("mgslpc_sppp_tx(%s)\n",info->netname);
 
        netif_stop_queue(dev);
 
        info->tx_count = skb->len;
 
        memcpy(info->tx_buf, skb->data, skb->len);
        info->tx_get = 0;
        info->tx_put = info->tx_count = skb->len;
 
        info->netstats.tx_packets++;
        info->netstats.tx_bytes += skb->len;
        dev_kfree_skb(skb);
 
        dev->trans_start = jiffies;
 
        spin_lock_irqsave(&info->lock,flags);
        if (!info->tx_active)
                tx_start(info);
        spin_unlock_irqrestore(&info->lock,flags);
 
        return 0;
}
 
int mgslpc_sppp_close(struct net_device *d)
{
        MGSLPC_INFO *info = d->priv;
        unsigned long flags;
 
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("mgslpc_sppp_close(%s)\n",info->netname);
 
        /* shutdown adapter and release resources */
        shutdown(info);
 
        /* allow syncppp to do close processing */
        sppp_close(d);
        netif_stop_queue(d);
 
        spin_lock_irqsave(&info->netlock, flags);
        info->netcount=0;
        MOD_DEC_USE_COUNT;
        spin_unlock_irqrestore(&info->netlock, flags);
        return 0;
}
 
void mgslpc_sppp_rx_done(MGSLPC_INFO *info, char *buf, int size)
{
        struct sk_buff *skb = dev_alloc_skb(size);
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("mgslpc_sppp_rx_done(%s)\n",info->netname);
        if (skb == NULL) {
                printk(KERN_NOTICE "%s: cant alloc skb, dropping packet\n",
                        info->netname);
                info->netstats.rx_dropped++;
                return;
        }
 
        memcpy(skb_put(skb, size),buf,size);
 
        skb->protocol = htons(ETH_P_WAN_PPP);
        skb->dev = info->netdev;
        skb->mac.raw = skb->data;
        info->netstats.rx_packets++;
        info->netstats.rx_bytes += size;
        netif_rx(skb);
        info->netdev->trans_start = jiffies;
}
 
void mgslpc_sppp_tx_done(MGSLPC_INFO *info)
{
        if (netif_queue_stopped(info->netdev))
            netif_wake_queue(info->netdev);
}
 
struct net_device_stats *mgslpc_net_stats(struct net_device *dev)
{
        MGSLPC_INFO *info = dev->priv;
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("mgslpc_net_stats(%s)\n",info->netname);
        return &info->netstats;
}
 
int mgslpc_sppp_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
        MGSLPC_INFO *info = (MGSLPC_INFO *)dev->priv;
        if (debug_level >= DEBUG_LEVEL_INFO)
                printk("%s(%d):mgslpc_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
                        info->netname, cmd );
        return sppp_do_ioctl(dev, ifr, cmd);
}
 
#endif /* ifdef CONFIG_SYNCLINK_SYNCPPP */
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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [char/] [pcmcia/] [synclink_cs.c] - Blame information for rev 1275

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* linux/drivers/char/synclink_cs.c`
3			`*`
4			`* $Id: synclink_cs.c,v 1.1.1.1 2004-04-15 02:03:22 phoenix Exp $`
5			`*`
6			`* Device driver for Microgate SyncLink PC Card`
7			`* multiprotocol serial adapter.`
8			`*`
9			`* written by Paul Fulghum for Microgate Corporation`
10			`* paulkf@microgate.com`
11			`*`
12			`* Microgate and SyncLink are trademarks of Microgate Corporation`
13			`*`
14			`* This code is released under the GNU General Public License (GPL)`
15			`*`
16			* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
17			`* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES`
18			`* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE`
19			`* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,`
20			`* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES`
21			`* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR`
22			`* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)`
23			`* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,`
24			`* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)`
25			`* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED`
26			`* OF THE POSSIBILITY OF SUCH DAMAGE.`
27			`*/`
28
29			`#define VERSION(ver,rel,seq) (((ver)<<16) \| ((rel)<<8) \| (seq))`
30			`#if defined(__i386__)`
31			`# define BREAKPOINT() asm(" int $3");`
32			`#else`
33			`# define BREAKPOINT() { }`
34			`#endif`
35
36			`#define MAX_DEVICE_COUNT 4`
37
38			`#include <linux/config.h>`
39			`#include <linux/module.h>`
40			`#include <linux/version.h>`