/*********************************************************************
 *                
 * Filename:      nsc-ircc.c
 * Version:       1.0
 * Description:   Driver for the NSC PC'108 and PC'338 IrDA chipsets
 * Status:        Stable.
 * Author:        Dag Brattli <dagb@cs.uit.no>
 * Created at:    Sat Nov  7 21:43:15 1998
 * Modified at:   Wed Mar  1 11:29:34 2000
 * Modified by:   Dag Brattli <dagb@cs.uit.no>
 * 
 *     Copyright (c) 1998-2000 Dag Brattli <dagb@cs.uit.no>
 *     Copyright (c) 1998 Lichen Wang, <lwang@actisys.com>
 *     Copyright (c) 1998 Actisys Corp., www.actisys.com
 *     Copyright (c) 2000-2004 Jean Tourrilhes <jt@hpl.hp.com>
 *     All Rights Reserved
 *      
 *     This program is free software; you can redistribute it and/or 
 *     modify it under the terms of the GNU General Public License as 
 *     published by the Free Software Foundation; either version 2 of 
 *     the License, or (at your option) any later version.
 *  
 *     Neither Dag Brattli nor University of Tromsø admit liability nor
 *     provide warranty for any of this software. This material is 
 *     provided "AS-IS" and at no charge.
 *
 *     Notice that all functions that needs to access the chip in _any_
 *     way, must save BSR register on entry, and restore it on exit. 
 *     It is _very_ important to follow this policy!
 *
 *         __u8 bank;
 *     
 *         bank = inb(iobase+BSR);
 *  
 *         do_your_stuff_here();
 *
 *         outb(bank, iobase+BSR);
 *
 *    If you find bugs in this file, its very likely that the same bug
 *    will also be in w83977af_ir.c since the implementations are quite
 *    similar.
 *     
 ********************************************************************/

#include <linux/module.h>

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/rtnetlink.h>
#include <linux/dma-mapping.h>
#include <linux/pnp.h>
#include <linux/platform_device.h>

#include <asm/io.h>
#include <asm/dma.h>
#include <asm/byteorder.h>

#include <net/irda/wrapper.h>
#include <net/irda/irda.h>
#include <net/irda/irda_device.h>

#include "nsc-ircc.h"

#define CHIP_IO_EXTENT 8
#define BROKEN_DONGLE_ID

static char *driver_name = "nsc-ircc";

/* Power Management */
#define NSC_IRCC_DRIVER_NAME                  "nsc-ircc"
static int nsc_ircc_suspend(struct platform_device *dev, pm_message_t state);
static int nsc_ircc_resume(struct platform_device *dev);

static struct platform_driver nsc_ircc_driver = {
        .suspend        = nsc_ircc_suspend,
        .resume         = nsc_ircc_resume,
        .driver         = {
                .name   = NSC_IRCC_DRIVER_NAME,
        },
};

/* Module parameters */
static int qos_mtt_bits = 0x07;  /* 1 ms or more */
static int dongle_id;

/* Use BIOS settions by default, but user may supply module parameters */
static unsigned int io[]  = { ~0, ~0, ~0, ~0, ~0 };
static unsigned int irq[] = {  0,  0,  0,  0,  0 };
static unsigned int dma[] = {  0,  0,  0,  0,  0 };

static int nsc_ircc_probe_108(nsc_chip_t *chip, chipio_t *info);
static int nsc_ircc_probe_338(nsc_chip_t *chip, chipio_t *info);
static int nsc_ircc_probe_39x(nsc_chip_t *chip, chipio_t *info);
static int nsc_ircc_init_108(nsc_chip_t *chip, chipio_t *info);
static int nsc_ircc_init_338(nsc_chip_t *chip, chipio_t *info);
static int nsc_ircc_init_39x(nsc_chip_t *chip, chipio_t *info);
#ifdef CONFIG_PNP
static int nsc_ircc_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *id);
#endif

/* These are the known NSC chips */
static nsc_chip_t chips[] = {
/*  Name, {cfg registers}, chip id index reg, chip id expected value, revision mask */
        { "PC87108", { 0x150, 0x398, 0xea }, 0x05, 0x10, 0xf0, 
          nsc_ircc_probe_108, nsc_ircc_init_108 },
        { "PC87338", { 0x398, 0x15c, 0x2e }, 0x08, 0xb0, 0xf8, 
          nsc_ircc_probe_338, nsc_ircc_init_338 },
        /* Contributed by Steffen Pingel - IBM X40 */
        { "PC8738x", { 0x164e, 0x4e, 0x2e }, 0x20, 0xf4, 0xff,
          nsc_ircc_probe_39x, nsc_ircc_init_39x },
        /* Contributed by Jan Frey - IBM A30/A31 */
        { "PC8739x", { 0x2e, 0x4e, 0x0 }, 0x20, 0xea, 0xff, 
          nsc_ircc_probe_39x, nsc_ircc_init_39x },
        /* IBM ThinkPads using PC8738x (T60/X60/Z60) */
        { "IBM-PC8738x", { 0x2e, 0x4e, 0x0 }, 0x20, 0xf4, 0xff,
          nsc_ircc_probe_39x, nsc_ircc_init_39x },
        /* IBM ThinkPads using PC8394T (T43/R52/?) */
        { "IBM-PC8394T", { 0x2e, 0x4e, 0x0 }, 0x20, 0xf9, 0xff,
          nsc_ircc_probe_39x, nsc_ircc_init_39x },
        { NULL }
};

static struct nsc_ircc_cb *dev_self[] = { NULL, NULL, NULL, NULL, NULL };

static char *dongle_types[] = {
        "Differential serial interface",
        "Differential serial interface",
        "Reserved",
        "Reserved",
        "Sharp RY5HD01",
        "Reserved",
        "Single-ended serial interface",
        "Consumer-IR only",
        "HP HSDL-2300, HP HSDL-3600/HSDL-3610",
        "IBM31T1100 or Temic TFDS6000/TFDS6500",
        "Reserved",
        "Reserved",
        "HP HSDL-1100/HSDL-2100",
        "HP HSDL-1100/HSDL-2100",
        "Supports SIR Mode only",
        "No dongle connected",
};

/* PNP probing */
static chipio_t pnp_info;
static const struct pnp_device_id nsc_ircc_pnp_table[] = {
        { .id = "NSC6001", .driver_data = 0 },
        { .id = "HWPC224", .driver_data = 0 },
        { .id = "IBM0071", .driver_data = NSC_FORCE_DONGLE_TYPE9 },
        { }
};

MODULE_DEVICE_TABLE(pnp, nsc_ircc_pnp_table);

static struct pnp_driver nsc_ircc_pnp_driver = {
#ifdef CONFIG_PNP
        .name = "nsc-ircc",
        .id_table = nsc_ircc_pnp_table,
        .probe = nsc_ircc_pnp_probe,
#endif
};

/* Some prototypes */
static int  nsc_ircc_open(chipio_t *info);
static int  nsc_ircc_close(struct nsc_ircc_cb *self);
static int  nsc_ircc_setup(chipio_t *info);
static void nsc_ircc_pio_receive(struct nsc_ircc_cb *self);
static int  nsc_ircc_dma_receive(struct nsc_ircc_cb *self); 
static int  nsc_ircc_dma_receive_complete(struct nsc_ircc_cb *self, int iobase);
static netdev_tx_t  nsc_ircc_hard_xmit_sir(struct sk_buff *skb,
                                                 struct net_device *dev);
static netdev_tx_t  nsc_ircc_hard_xmit_fir(struct sk_buff *skb,
                                                 struct net_device *dev);
static int  nsc_ircc_pio_write(int iobase, __u8 *buf, int len, int fifo_size);
static void nsc_ircc_dma_xmit(struct nsc_ircc_cb *self, int iobase);
static __u8 nsc_ircc_change_speed(struct nsc_ircc_cb *self, __u32 baud);
static int  nsc_ircc_is_receiving(struct nsc_ircc_cb *self);
static int  nsc_ircc_read_dongle_id (int iobase);
static void nsc_ircc_init_dongle_interface (int iobase, int dongle_id);

static int  nsc_ircc_net_open(struct net_device *dev);
static int  nsc_ircc_net_close(struct net_device *dev);
static int  nsc_ircc_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);

/* Globals */
static int pnp_registered;
static int pnp_succeeded;

/*
 * Function nsc_ircc_init ()
 *
 *    Initialize chip. Just try to find out how many chips we are dealing with
 *    and where they are
 */
static int __init nsc_ircc_init(void)
{
        chipio_t info;
        nsc_chip_t *chip;
        int ret;
        int cfg_base;
        int cfg, id;
        int reg;
        int i = 0;

        ret = platform_driver_register(&nsc_ircc_driver);
        if (ret) {
                IRDA_ERROR("%s, Can't register driver!\n", driver_name);
                return ret;
        }

        /* Register with PnP subsystem to detect disable ports */
        ret = pnp_register_driver(&nsc_ircc_pnp_driver);

        if (!ret)
                pnp_registered = 1;

        ret = -ENODEV;

        /* Probe for all the NSC chipsets we know about */
        for (chip = chips; chip->name ; chip++) {
                IRDA_DEBUG(2, "%s(), Probing for %s ...\n", __func__,
                           chip->name);
                
                /* Try all config registers for this chip */
                for (cfg = 0; cfg < ARRAY_SIZE(chip->cfg); cfg++) {
                        cfg_base = chip->cfg[cfg];
                        if (!cfg_base)
                                continue;

                        /* Read index register */
                        reg = inb(cfg_base);
                        if (reg == 0xff) {
                                IRDA_DEBUG(2, "%s() no chip at 0x%03x\n", __func__, cfg_base);
                                continue;
                        }
                        
                        /* Read chip identification register */
                        outb(chip->cid_index, cfg_base);
                        id = inb(cfg_base+1);
                        if ((id & chip->cid_mask) == chip->cid_value) {
                                IRDA_DEBUG(2, "%s() Found %s chip, revision=%d\n",
                                           __func__, chip->name, id & ~chip->cid_mask);

                                /*
                                 * If we found a correct PnP setting,
                                 * we first try it.
                                 */
                                if (pnp_succeeded) {
                                        memset(&info, 0, sizeof(chipio_t));
                                        info.cfg_base = cfg_base;
                                        info.fir_base = pnp_info.fir_base;
                                        info.dma = pnp_info.dma;
                                        info.irq = pnp_info.irq;

                                        if (info.fir_base < 0x2000) {
                                                IRDA_MESSAGE("%s, chip->init\n", driver_name);
                                                chip->init(chip, &info);
                                        } else
                                                chip->probe(chip, &info);

                                        if (nsc_ircc_open(&info) >= 0)
                                                ret = 0;
                                }

                                /*
                                 * Opening based on PnP values failed.
                                 * Let's fallback to user values, or probe
                                 * the chip.
                                 */
                                if (ret) {
                                        IRDA_DEBUG(2, "%s, PnP init failed\n", driver_name);
                                        memset(&info, 0, sizeof(chipio_t));
                                        info.cfg_base = cfg_base;
                                        info.fir_base = io[i];
                                        info.dma = dma[i];
                                        info.irq = irq[i];

                                        /*
                                         * If the user supplies the base address, then
                                         * we init the chip, if not we probe the values
                                         * set by the BIOS
                                         */
                                        if (io[i] < 0x2000) {
                                                chip->init(chip, &info);
                                        } else
                                                chip->probe(chip, &info);

                                        if (nsc_ircc_open(&info) >= 0)
                                                ret = 0;
                                }
                                i++;
                        } else {
                                IRDA_DEBUG(2, "%s(), Wrong chip id=0x%02x\n", __func__, id);
                        }
                } 
        }

        if (ret) {
                platform_driver_unregister(&nsc_ircc_driver);
                pnp_unregister_driver(&nsc_ircc_pnp_driver);
                pnp_registered = 0;
        }

        return ret;
}

/*
 * Function nsc_ircc_cleanup ()
 *
 *    Close all configured chips
 *
 */
static void __exit nsc_ircc_cleanup(void)
{
        int i;

        for (i = 0; i < ARRAY_SIZE(dev_self); i++) {
                if (dev_self[i])
                        nsc_ircc_close(dev_self[i]);
        }

        platform_driver_unregister(&nsc_ircc_driver);

        if (pnp_registered)
                pnp_unregister_driver(&nsc_ircc_pnp_driver);

        pnp_registered = 0;
}

static const struct net_device_ops nsc_ircc_sir_ops = {
        .ndo_open       = nsc_ircc_net_open,
        .ndo_stop       = nsc_ircc_net_close,
        .ndo_start_xmit = nsc_ircc_hard_xmit_sir,
        .ndo_do_ioctl   = nsc_ircc_net_ioctl,
};

static const struct net_device_ops nsc_ircc_fir_ops = {
        .ndo_open       = nsc_ircc_net_open,
        .ndo_stop       = nsc_ircc_net_close,
        .ndo_start_xmit = nsc_ircc_hard_xmit_fir,
        .ndo_do_ioctl   = nsc_ircc_net_ioctl,
};

/*
 * Function nsc_ircc_open (iobase, irq)
 *
 *    Open driver instance
 *
 */
static int __init nsc_ircc_open(chipio_t *info)
{
        struct net_device *dev;
        struct nsc_ircc_cb *self;
        void *ret;
        int err, chip_index;

        IRDA_DEBUG(2, "%s()\n", __func__);


        for (chip_index = 0; chip_index < ARRAY_SIZE(dev_self); chip_index++) {
                if (!dev_self[chip_index])
                        break;
        }

        if (chip_index == ARRAY_SIZE(dev_self)) {
                IRDA_ERROR("%s(), maximum number of supported chips reached!\n", __func__);
                return -ENOMEM;
        }

        IRDA_MESSAGE("%s, Found chip at base=0x%03x\n", driver_name,
                     info->cfg_base);

        if ((nsc_ircc_setup(info)) == -1)
                return -1;

        IRDA_MESSAGE("%s, driver loaded (Dag Brattli)\n", driver_name);

        dev = alloc_irdadev(sizeof(struct nsc_ircc_cb));
        if (dev == NULL) {
                IRDA_ERROR("%s(), can't allocate memory for "
                           "control block!\n", __func__);
                return -ENOMEM;
        }

        self = netdev_priv(dev);
        self->netdev = dev;
        spin_lock_init(&self->lock);
   
        /* Need to store self somewhere */
        dev_self[chip_index] = self;
        self->index = chip_index;

        /* Initialize IO */
        self->io.cfg_base  = info->cfg_base;
        self->io.fir_base  = info->fir_base;
        self->io.irq       = info->irq;
        self->io.fir_ext   = CHIP_IO_EXTENT;
        self->io.dma       = info->dma;
        self->io.fifo_size = 32;
        
        /* Reserve the ioports that we need */
        ret = request_region(self->io.fir_base, self->io.fir_ext, driver_name);
        if (!ret) {
                IRDA_WARNING("%s(), can't get iobase of 0x%03x\n",
                             __func__, self->io.fir_base);
                err = -ENODEV;
                goto out1;
        }

        /* Initialize QoS for this device */
        irda_init_max_qos_capabilies(&self->qos);
        
        /* The only value we must override it the baudrate */
        self->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|
                IR_115200|IR_576000|IR_1152000 |(IR_4000000 << 8);
        
        self->qos.min_turn_time.bits = qos_mtt_bits;
        irda_qos_bits_to_value(&self->qos);
        
        /* Max DMA buffer size needed = (data_size + 6) * (window_size) + 6; */
        self->rx_buff.truesize = 14384; 
        self->tx_buff.truesize = 14384;

        /* Allocate memory if needed */
        self->rx_buff.head =
                dma_alloc_coherent(NULL, self->rx_buff.truesize,
                                   &self->rx_buff_dma, GFP_KERNEL);
        if (self->rx_buff.head == NULL) {
                err = -ENOMEM;
                goto out2;

        }
        memset(self->rx_buff.head, 0, self->rx_buff.truesize);
        
        self->tx_buff.head =
                dma_alloc_coherent(NULL, self->tx_buff.truesize,
                                   &self->tx_buff_dma, GFP_KERNEL);
        if (self->tx_buff.head == NULL) {
                err = -ENOMEM;
                goto out3;
        }
        memset(self->tx_buff.head, 0, self->tx_buff.truesize);

        self->rx_buff.in_frame = FALSE;
        self->rx_buff.state = OUTSIDE_FRAME;
        self->tx_buff.data = self->tx_buff.head;
        self->rx_buff.data = self->rx_buff.head;
        
        /* Reset Tx queue info */
        self->tx_fifo.len = self->tx_fifo.ptr = self->tx_fifo.free = 0;
        self->tx_fifo.tail = self->tx_buff.head;

        /* Override the network functions we need to use */
        dev->netdev_ops = &nsc_ircc_sir_ops;

        err = register_netdev(dev);
        if (err) {
                IRDA_ERROR("%s(), register_netdev() failed!\n", __func__);
                goto out4;
        }
        IRDA_MESSAGE("IrDA: Registered device %s\n", dev->name);

        /* Check if user has supplied a valid dongle id or not */
        if ((dongle_id <= 0) ||
            (dongle_id >= ARRAY_SIZE(dongle_types))) {
                dongle_id = nsc_ircc_read_dongle_id(self->io.fir_base);
                
                IRDA_MESSAGE("%s, Found dongle: %s\n", driver_name,
                             dongle_types[dongle_id]);
        } else {
                IRDA_MESSAGE("%s, Using dongle: %s\n", driver_name,
                             dongle_types[dongle_id]);
        }
        
        self->io.dongle_id = dongle_id;
        nsc_ircc_init_dongle_interface(self->io.fir_base, dongle_id);

        self->pldev = platform_device_register_simple(NSC_IRCC_DRIVER_NAME,
                                                      self->index, NULL, 0);
        if (IS_ERR(self->pldev)) {
                err = PTR_ERR(self->pldev);
                goto out5;
        }
        platform_set_drvdata(self->pldev, self);

        return chip_index;

 out5:
        unregister_netdev(dev);
 out4:
        dma_free_coherent(NULL, self->tx_buff.truesize,
                          self->tx_buff.head, self->tx_buff_dma);
 out3:
        dma_free_coherent(NULL, self->rx_buff.truesize,
                          self->rx_buff.head, self->rx_buff_dma);
 out2:
        release_region(self->io.fir_base, self->io.fir_ext);
 out1:
        free_netdev(dev);
        dev_self[chip_index] = NULL;
        return err;
}

/*
 * Function nsc_ircc_close (self)
 *
 *    Close driver instance
 *
 */
static int __exit nsc_ircc_close(struct nsc_ircc_cb *self)
{
        int iobase;

        IRDA_DEBUG(4, "%s()\n", __func__);

        IRDA_ASSERT(self != NULL, return -1;);

        iobase = self->io.fir_base;

        platform_device_unregister(self->pldev);

        /* Remove netdevice */
        unregister_netdev(self->netdev);

        /* Release the PORT that this driver is using */
        IRDA_DEBUG(4, "%s(), Releasing Region %03x\n", 
                   __func__, self->io.fir_base);
        release_region(self->io.fir_base, self->io.fir_ext);

        if (self->tx_buff.head)
                dma_free_coherent(NULL, self->tx_buff.truesize,
                                  self->tx_buff.head, self->tx_buff_dma);
        
        if (self->rx_buff.head)
                dma_free_coherent(NULL, self->rx_buff.truesize,
                                  self->rx_buff.head, self->rx_buff_dma);

        dev_self[self->index] = NULL;
        free_netdev(self->netdev);
        
        return 0;
}

/*
 * Function nsc_ircc_init_108 (iobase, cfg_base, irq, dma)
 *
 *    Initialize the NSC '108 chip
 *
 */
static int nsc_ircc_init_108(nsc_chip_t *chip, chipio_t *info)
{
        int cfg_base = info->cfg_base;
        __u8 temp=0;

        outb(2, cfg_base);      /* Mode Control Register (MCTL) */
        outb(0x00, cfg_base+1); /* Disable device */
        
        /* Base Address and Interrupt Control Register (BAIC) */
        outb(CFG_108_BAIC, cfg_base);
        switch (info->fir_base) {
        case 0x3e8: outb(0x14, cfg_base+1); break;
        case 0x2e8: outb(0x15, cfg_base+1); break;
        case 0x3f8: outb(0x16, cfg_base+1); break;
        case 0x2f8: outb(0x17, cfg_base+1); break;
        default: IRDA_ERROR("%s(), invalid base_address", __func__);
        }
        
        /* Control Signal Routing Register (CSRT) */
        switch (info->irq) {
        case 3:  temp = 0x01; break;
        case 4:  temp = 0x02; break;
        case 5:  temp = 0x03; break;
        case 7:  temp = 0x04; break;
        case 9:  temp = 0x05; break;
        case 11: temp = 0x06; break;
        case 15: temp = 0x07; break;
        default: IRDA_ERROR("%s(), invalid irq", __func__);
        }
        outb(CFG_108_CSRT, cfg_base);
        
        switch (info->dma) {    
        case 0: outb(0x08+temp, cfg_base+1); break;
        case 1: outb(0x10+temp, cfg_base+1); break;
        case 3: outb(0x18+temp, cfg_base+1); break;
        default: IRDA_ERROR("%s(), invalid dma", __func__);
        }
        
        outb(CFG_108_MCTL, cfg_base);      /* Mode Control Register (MCTL) */
        outb(0x03, cfg_base+1); /* Enable device */

        return 0;
}

/*
 * Function nsc_ircc_probe_108 (chip, info)
 *
 *    
 *
 */
static int nsc_ircc_probe_108(nsc_chip_t *chip, chipio_t *info) 
{
        int cfg_base = info->cfg_base;
        int reg;

        /* Read address and interrupt control register (BAIC) */
        outb(CFG_108_BAIC, cfg_base);
        reg = inb(cfg_base+1);
        
        switch (reg & 0x03) {
        case 0:
                info->fir_base = 0x3e8;
                break;
        case 1:
                info->fir_base = 0x2e8;
                break;
        case 2:
                info->fir_base = 0x3f8;
                break;
        case 3:
                info->fir_base = 0x2f8;
                break;
        }
        info->sir_base = info->fir_base;
        IRDA_DEBUG(2, "%s(), probing fir_base=0x%03x\n", __func__,
                   info->fir_base);

        /* Read control signals routing register (CSRT) */
        outb(CFG_108_CSRT, cfg_base);
        reg = inb(cfg_base+1);

        switch (reg & 0x07) {
        case 0:
                info->irq = -1;
                break;
        case 1:
                info->irq = 3;
                break;
        case 2:
                info->irq = 4;
                break;
        case 3:
                info->irq = 5;
                break;
        case 4:
                info->irq = 7;
                break;
        case 5:
                info->irq = 9;
                break;
        case 6:
                info->irq = 11;
                break;
        case 7:
                info->irq = 15;
                break;
        }
        IRDA_DEBUG(2, "%s(), probing irq=%d\n", __func__, info->irq);

        /* Currently we only read Rx DMA but it will also be used for Tx */
        switch ((reg >> 3) & 0x03) {
        case 0:
                info->dma = -1;
                break;
        case 1:
                info->dma = 0;
                break;
        case 2:
                info->dma = 1;
                break;
        case 3:
                info->dma = 3;
                break;
        }
        IRDA_DEBUG(2, "%s(), probing dma=%d\n", __func__, info->dma);

        /* Read mode control register (MCTL) */
        outb(CFG_108_MCTL, cfg_base);
        reg = inb(cfg_base+1);

        info->enabled = reg & 0x01;
        info->suspended = !((reg >> 1) & 0x01);

        return 0;
}

/*
 * Function nsc_ircc_init_338 (chip, info)
 *
 *    Initialize the NSC '338 chip. Remember that the 87338 needs two 
 *    consecutive writes to the data registers while CPU interrupts are
 *    disabled. The 97338 does not require this, but shouldn't be any
 *    harm if we do it anyway.
 */
static int nsc_ircc_init_338(nsc_chip_t *chip, chipio_t *info) 
{
        /* No init yet */
        
        return 0;
}

/*
 * Function nsc_ircc_probe_338 (chip, info)
 *
 *    
 *
 */
static int nsc_ircc_probe_338(nsc_chip_t *chip, chipio_t *info) 
{
        int cfg_base = info->cfg_base;
        int reg, com = 0;
        int pnp;

        /* Read funtion enable register (FER) */
        outb(CFG_338_FER, cfg_base);
        reg = inb(cfg_base+1);

        info->enabled = (reg >> 2) & 0x01;

        /* Check if we are in Legacy or PnP mode */
        outb(CFG_338_PNP0, cfg_base);
        reg = inb(cfg_base+1);
        
        pnp = (reg >> 3) & 0x01;
        if (pnp) {
                IRDA_DEBUG(2, "(), Chip is in PnP mode\n");
                outb(0x46, cfg_base);
                reg = (inb(cfg_base+1) & 0xfe) << 2;

                outb(0x47, cfg_base);
                reg |= ((inb(cfg_base+1) & 0xfc) << 8);

                info->fir_base = reg;
        } else {
                /* Read function address register (FAR) */
                outb(CFG_338_FAR, cfg_base);
                reg = inb(cfg_base+1);
                
                switch ((reg >> 4) & 0x03) {
                case 0:
                        info->fir_base = 0x3f8;
                        break;
                case 1:
                        info->fir_base = 0x2f8;
                        break;
                case 2:
                        com = 3;
                        break;
                case 3:
                        com = 4;
                        break;
                }
                
                if (com) {
                        switch ((reg >> 6) & 0x03) {
                        case 0:
                                if (com == 3)
                                        info->fir_base = 0x3e8;
                                else
                                        info->fir_base = 0x2e8;
                                break;
                        case 1:
                                if (com == 3)
                                        info->fir_base = 0x338;
                                else
                                        info->fir_base = 0x238;
                                break;
                        case 2:
                                if (com == 3)
                                        info->fir_base = 0x2e8;
                                else
                                        info->fir_base = 0x2e0;
                                break;
                        case 3:
                                if (com == 3)
                                        info->fir_base = 0x220;
                                else
                                        info->fir_base = 0x228;
                                break;
                        }
                }
        }
        info->sir_base = info->fir_base;

        /* Read PnP register 1 (PNP1) */
        outb(CFG_338_PNP1, cfg_base);
        reg = inb(cfg_base+1);
        
        info->irq = reg >> 4;
        
        /* Read PnP register 3 (PNP3) */
        outb(CFG_338_PNP3, cfg_base);
        reg = inb(cfg_base+1);

        info->dma = (reg & 0x07) - 1;

        /* Read power and test register (PTR) */
        outb(CFG_338_PTR, cfg_base);
        reg = inb(cfg_base+1);

        info->suspended = reg & 0x01;

        return 0;
}


/*
 * Function nsc_ircc_init_39x (chip, info)
 *
 *    Now that we know it's a '39x (see probe below), we need to
 *    configure it so we can use it.
 *
 * The NSC '338 chip is a Super I/O chip with a "bank" architecture,
 * the configuration of the different functionality (serial, parallel,
 * floppy...) are each in a different bank (Logical Device Number).
 * The base address, irq and dma configuration registers are common
 * to all functionalities (index 0x30 to 0x7F).
 * There is only one configuration register specific to the
 * serial port, CFG_39X_SPC.
 * JeanII
 *
 * Note : this code was written by Jan Frey <janfrey@web.de>
 */
static int nsc_ircc_init_39x(nsc_chip_t *chip, chipio_t *info) 
{
        int cfg_base = info->cfg_base;
        int enabled;

        /* User is sure about his config... accept it. */
        IRDA_DEBUG(2, "%s(): nsc_ircc_init_39x (user settings): "
                   "io=0x%04x, irq=%d, dma=%d\n", 
                   __func__, info->fir_base, info->irq, info->dma);

        /* Access bank for SP2 */
        outb(CFG_39X_LDN, cfg_base);
        outb(0x02, cfg_base+1);

        /* Configure SP2 */

        /* We want to enable the device if not enabled */
        outb(CFG_39X_ACT, cfg_base);
        enabled = inb(cfg_base+1) & 0x01;
        
        if (!enabled) {
                /* Enable the device */
                outb(CFG_39X_SIOCF1, cfg_base);
                outb(0x01, cfg_base+1);
                /* May want to update info->enabled. Jean II */
        }

        /* Enable UART bank switching (bit 7) ; Sets the chip to normal
         * power mode (wake up from sleep mode) (bit 1) */
        outb(CFG_39X_SPC, cfg_base);
        outb(0x82, cfg_base+1);

        return 0;
}

/*
 * Function nsc_ircc_probe_39x (chip, info)
 *
 *    Test if we really have a '39x chip at the given address
 *
 * Note : this code was written by Jan Frey <janfrey@web.de>
 */
static int nsc_ircc_probe_39x(nsc_chip_t *chip, chipio_t *info) 
{
        int cfg_base = info->cfg_base;
        int reg1, reg2, irq, irqt, dma1, dma2;
        int enabled, susp;

        IRDA_DEBUG(2, "%s(), nsc_ircc_probe_39x, base=%d\n",
                   __func__, cfg_base);

        /* This function should be executed with irq off to avoid
         * another driver messing with the Super I/O bank - Jean II */

        /* Access bank for SP2 */
        outb(CFG_39X_LDN, cfg_base);
        outb(0x02, cfg_base+1);

        /* Read infos about SP2 ; store in info struct */
        outb(CFG_39X_BASEH, cfg_base);
        reg1 = inb(cfg_base+1);
        outb(CFG_39X_BASEL, cfg_base);
        reg2 = inb(cfg_base+1);
        info->fir_base = (reg1 << 8) | reg2;

        outb(CFG_39X_IRQNUM, cfg_base);
        irq = inb(cfg_base+1);
        outb(CFG_39X_IRQSEL, cfg_base);
        irqt = inb(cfg_base+1);
        info->irq = irq;

        outb(CFG_39X_DMA0, cfg_base);
        dma1 = inb(cfg_base+1);
        outb(CFG_39X_DMA1, cfg_base);
        dma2 = inb(cfg_base+1);
        info->dma = dma1 -1;

        outb(CFG_39X_ACT, cfg_base);
        info->enabled = enabled = inb(cfg_base+1) & 0x01;
        
        outb(CFG_39X_SPC, cfg_base);
        susp = 1 - ((inb(cfg_base+1) & 0x02) >> 1);

        IRDA_DEBUG(2, "%s(): io=0x%02x%02x, irq=%d (type %d), rxdma=%d, txdma=%d, enabled=%d (suspended=%d)\n", __func__, reg1,reg2,irq,irqt,dma1,dma2,enabled,susp);

        /* Configure SP2 */

        /* We want to enable the device if not enabled */
        outb(CFG_39X_ACT, cfg_base);
        enabled = inb(cfg_base+1) & 0x01;
        
        if (!enabled) {
                /* Enable the device */
                outb(CFG_39X_SIOCF1, cfg_base);
                outb(0x01, cfg_base+1);
                /* May want to update info->enabled. Jean II */
        }

        /* Enable UART bank switching (bit 7) ; Sets the chip to normal
         * power mode (wake up from sleep mode) (bit 1) */
        outb(CFG_39X_SPC, cfg_base);
        outb(0x82, cfg_base+1);

        return 0;
}

#ifdef CONFIG_PNP
/* PNP probing */
static int nsc_ircc_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *id)
{
        memset(&pnp_info, 0, sizeof(chipio_t));
        pnp_info.irq = -1;
        pnp_info.dma = -1;
        pnp_succeeded = 1;

        if (id->driver_data & NSC_FORCE_DONGLE_TYPE9)
                dongle_id = 0x9;

        /* There doesn't seem to be any way of getting the cfg_base.
         * On my box, cfg_base is in the PnP descriptor of the
         * motherboard. Oh well... Jean II */

        if (pnp_port_valid(dev, 0) &&
                !(pnp_port_flags(dev, 0) & IORESOURCE_DISABLED))
                pnp_info.fir_base = pnp_port_start(dev, 0);

        if (pnp_irq_valid(dev, 0) &&
                !(pnp_irq_flags(dev, 0) & IORESOURCE_DISABLED))
                pnp_info.irq = pnp_irq(dev, 0);

        if (pnp_dma_valid(dev, 0) &&
                !(pnp_dma_flags(dev, 0) & IORESOURCE_DISABLED))
                pnp_info.dma = pnp_dma(dev, 0);

        IRDA_DEBUG(0, "%s() : From PnP, found firbase 0x%03X ; irq %d ; dma %d.\n",
                   __func__, pnp_info.fir_base, pnp_info.irq, pnp_info.dma);

        if((pnp_info.fir_base == 0) ||
           (pnp_info.irq == -1) || (pnp_info.dma == -1)) {
                /* Returning an error will disable the device. Yuck ! */
                //return -EINVAL;
                pnp_succeeded = 0;
        }

        return 0;
}
#endif

/*
 * Function nsc_ircc_setup (info)
 *
 *    Returns non-negative on success.
 *
 */
static int nsc_ircc_setup(chipio_t *info)
{
        int version;
        int iobase = info->fir_base;

        /* Read the Module ID */
        switch_bank(iobase, BANK3);
        version = inb(iobase+MID);

        IRDA_DEBUG(2, "%s() Driver %s Found chip version %02x\n",
                   __func__, driver_name, version);

        /* Should be 0x2? */
        if (0x20 != (version & 0xf0)) {
                IRDA_ERROR("%s, Wrong chip version %02x\n",
                           driver_name, version);
                return -1;
        }

        /* Switch to advanced mode */
        switch_bank(iobase, BANK2);
        outb(ECR1_EXT_SL, iobase+ECR1);
        switch_bank(iobase, BANK0);
        
        /* Set FIFO threshold to TX17, RX16, reset and enable FIFO's */
        switch_bank(iobase, BANK0);
        outb(FCR_RXTH|FCR_TXTH|FCR_TXSR|FCR_RXSR|FCR_FIFO_EN, iobase+FCR);

        outb(0x03, iobase+LCR);         /* 8 bit word length */
        outb(MCR_SIR, iobase+MCR);      /* Start at SIR-mode, also clears LSR*/

        /* Set FIFO size to 32 */
        switch_bank(iobase, BANK2);
        outb(EXCR2_RFSIZ|EXCR2_TFSIZ, iobase+EXCR2);

        /* IRCR2: FEND_MD is not set */
        switch_bank(iobase, BANK5);
        outb(0x02, iobase+4);

        /* Make sure that some defaults are OK */
        switch_bank(iobase, BANK6);
        outb(0x20, iobase+0); /* Set 32 bits FIR CRC */
        outb(0x0a, iobase+1); /* Set MIR pulse width */
        outb(0x0d, iobase+2); /* Set SIR pulse width to 1.6us */
        outb(0x2a, iobase+4); /* Set beginning frag, and preamble length */

        /* Enable receive interrupts */
        switch_bank(iobase, BANK0);
        outb(IER_RXHDL_IE, iobase+IER);

        return 0;
}

/*
 * Function nsc_ircc_read_dongle_id (void)
 *
 * Try to read dongle indentification. This procedure needs to be executed
 * once after power-on/reset. It also needs to be used whenever you suspect
 * that the user may have plugged/unplugged the IrDA Dongle.
 */
static int nsc_ircc_read_dongle_id (int iobase)
{
        int dongle_id;
        __u8 bank;

        bank = inb(iobase+BSR);

        /* Select Bank 7 */
        switch_bank(iobase, BANK7);
        
        /* IRCFG4: IRSL0_DS and IRSL21_DS are cleared */
        outb(0x00, iobase+7);
        
        /* ID0, 1, and 2 are pulled up/down very slowly */
        udelay(50);
        
        /* IRCFG1: read the ID bits */
        dongle_id = inb(iobase+4) & 0x0f;

#ifdef BROKEN_DONGLE_ID
        if (dongle_id == 0x0a)
                dongle_id = 0x09;
#endif  
        /* Go back to  bank 0 before returning */
        switch_bank(iobase, BANK0);

        outb(bank, iobase+BSR);

        return dongle_id;
}

/*
 * Function nsc_ircc_init_dongle_interface (iobase, dongle_id)
 *
 *     This function initializes the dongle for the transceiver that is
 *     used. This procedure needs to be executed once after
 *     power-on/reset. It also needs to be used whenever you suspect that
 *     the dongle is changed. 
 */
static void nsc_ircc_init_dongle_interface (int iobase, int dongle_id)
{
        int bank;

        /* Save current bank */
        bank = inb(iobase+BSR);

        /* Select Bank 7 */
        switch_bank(iobase, BANK7);
        
        /* IRCFG4: set according to dongle_id */
        switch (dongle_id) {
        case 0x00: /* same as */
        case 0x01: /* Differential serial interface */
                IRDA_DEBUG(0, "%s(), %s not defined by irda yet\n",
                           __func__, dongle_types[dongle_id]);
                break;
        case 0x02: /* same as */
        case 0x03: /* Reserved */
                IRDA_DEBUG(0, "%s(), %s not defined by irda yet\n",
                           __func__, dongle_types[dongle_id]);
                break;
        case 0x04: /* Sharp RY5HD01 */
                break;
        case 0x05: /* Reserved, but this is what the Thinkpad reports */
                IRDA_DEBUG(0, "%s(), %s not defined by irda yet\n",
                           __func__, dongle_types[dongle_id]);
                break;
        case 0x06: /* Single-ended serial interface */
                IRDA_DEBUG(0, "%s(), %s not defined by irda yet\n",
                           __func__, dongle_types[dongle_id]);
                break;
        case 0x07: /* Consumer-IR only */
                IRDA_DEBUG(0, "%s(), %s is not for IrDA mode\n",
                           __func__, dongle_types[dongle_id]);
                break;
        case 0x08: /* HP HSDL-2300, HP HSDL-3600/HSDL-3610 */
                IRDA_DEBUG(0, "%s(), %s\n",
                           __func__, dongle_types[dongle_id]);
                break;
        case 0x09: /* IBM31T1100 or Temic TFDS6000/TFDS6500 */
                outb(0x28, iobase+7); /* Set irsl[0-2] as output */
                break;
        case 0x0A: /* same as */
        case 0x0B: /* Reserved */
                IRDA_DEBUG(0, "%s(), %s not defined by irda yet\n",
                           __func__, dongle_types[dongle_id]);
                break;
        case 0x0C: /* same as */
        case 0x0D: /* HP HSDL-1100/HSDL-2100 */
                /* 
                 * Set irsl0 as input, irsl[1-2] as output, and separate 
                 * inputs are used for SIR and MIR/FIR 
                 */
                outb(0x48, iobase+7); 
                break;
        case 0x0E: /* Supports SIR Mode only */
                outb(0x28, iobase+7); /* Set irsl[0-2] as output */
                break;
        case 0x0F: /* No dongle connected */
                IRDA_DEBUG(0, "%s(), %s\n",
                           __func__, dongle_types[dongle_id]);

                switch_bank(iobase, BANK0);
                outb(0x62, iobase+MCR);
                break;
        default: 
                IRDA_DEBUG(0, "%s(), invalid dongle_id %#x", 
                           __func__, dongle_id);
        }
        
        /* IRCFG1: IRSL1 and 2 are set to IrDA mode */
        outb(0x00, iobase+4);

        /* Restore bank register */
        outb(bank, iobase+BSR);
        
} /* set_up_dongle_interface */

/*
 * Function nsc_ircc_change_dongle_speed (iobase, speed, dongle_id)
 *
 *    Change speed of the attach dongle
 *
 */
static void nsc_ircc_change_dongle_speed(int iobase, int speed, int dongle_id)
{
        __u8 bank;

        /* Save current bank */
        bank = inb(iobase+BSR);

        /* Select Bank 7 */
        switch_bank(iobase, BANK7);
        
        /* IRCFG1: set according to dongle_id */
        switch (dongle_id) {
        case 0x00: /* same as */
        case 0x01: /* Differential serial interface */
                IRDA_DEBUG(0, "%s(), %s not defined by irda yet\n",
                           __func__, dongle_types[dongle_id]);
                break;
        case 0x02: /* same as */
        case 0x03: /* Reserved */
                IRDA_DEBUG(0, "%s(), %s not defined by irda yet\n",
                           __func__, dongle_types[dongle_id]);
                break;
        case 0x04: /* Sharp RY5HD01 */
                break;
        case 0x05: /* Reserved */
                IRDA_DEBUG(0, "%s(), %s not defined by irda yet\n",
                           __func__, dongle_types[dongle_id]);
                break;
        case 0x06: /* Single-ended serial interface */
                IRDA_DEBUG(0, "%s(), %s not defined by irda yet\n",
                           __func__, dongle_types[dongle_id]);
                break;
        case 0x07: /* Consumer-IR only */
                IRDA_DEBUG(0, "%s(), %s is not for IrDA mode\n",
                           __func__, dongle_types[dongle_id]);
                break;
        case 0x08: /* HP HSDL-2300, HP HSDL-3600/HSDL-3610 */
                IRDA_DEBUG(0, "%s(), %s\n", 
                           __func__, dongle_types[dongle_id]);
                outb(0x00, iobase+4);
                if (speed > 115200)
                        outb(0x01, iobase+4);
                break;
        case 0x09: /* IBM31T1100 or Temic TFDS6000/TFDS6500 */
                outb(0x01, iobase+4);

                if (speed == 4000000) {
                        /* There was a cli() there, but we now are already
                         * under spin_lock_irqsave() - JeanII */
                        outb(0x81, iobase+4);
                        outb(0x80, iobase+4);
                } else
                        outb(0x00, iobase+4);
                break;
        case 0x0A: /* same as */
        case 0x0B: /* Reserved */
                IRDA_DEBUG(0, "%s(), %s not defined by irda yet\n",
                           __func__, dongle_types[dongle_id]);
                break;
        case 0x0C: /* same as */
        case 0x0D: /* HP HSDL-1100/HSDL-2100 */
                break;
        case 0x0E: /* Supports SIR Mode only */
                break;
        case 0x0F: /* No dongle connected */
                IRDA_DEBUG(0, "%s(), %s is not for IrDA mode\n",
                           __func__, dongle_types[dongle_id]);

                switch_bank(iobase, BANK0); 
                outb(0x62, iobase+MCR);
                break;
        default: 
                IRDA_DEBUG(0, "%s(), invalid data_rate\n", __func__);
        }
        /* Restore bank register */
        outb(bank, iobase+BSR);
}

/*
 * Function nsc_ircc_change_speed (self, baud)
 *
 *    Change the speed of the device
 *
 * This function *must* be called with irq off and spin-lock.
 */
static __u8 nsc_ircc_change_speed(struct nsc_ircc_cb *self, __u32 speed)
{
        struct net_device *dev = self->netdev;
        __u8 mcr = MCR_SIR;
        int iobase; 
        __u8 bank;
        __u8 ier;                  /* Interrupt enable register */

        IRDA_DEBUG(2, "%s(), speed=%d\n", __func__, speed);

        IRDA_ASSERT(self != NULL, return 0;);

        iobase = self->io.fir_base;

        /* Update accounting for new speed */
        self->io.speed = speed;

        /* Save current bank */
        bank = inb(iobase+BSR);

        /* Disable interrupts */
        switch_bank(iobase, BANK0);
        outb(0, iobase+IER);

        /* Select Bank 2 */
        switch_bank(iobase, BANK2);

        outb(0x00, iobase+BGDH);
        switch (speed) {
        case 9600:   outb(0x0c, iobase+BGDL); break;
        case 19200:  outb(0x06, iobase+BGDL); break;
        case 38400:  outb(0x03, iobase+BGDL); break;
        case 57600:  outb(0x02, iobase+BGDL); break;
        case 115200: outb(0x01, iobase+BGDL); break;
        case 576000:
                switch_bank(iobase, BANK5);
                
                /* IRCR2: MDRS is set */
                outb(inb(iobase+4) | 0x04, iobase+4);
               
                mcr = MCR_MIR;
                IRDA_DEBUG(0, "%s(), handling baud of 576000\n", __func__);
                break;
        case 1152000:
                mcr = MCR_MIR;
                IRDA_DEBUG(0, "%s(), handling baud of 1152000\n", __func__);
                break;
        case 4000000:
                mcr = MCR_FIR;
                IRDA_DEBUG(0, "%s(), handling baud of 4000000\n", __func__);
                break;
        default:
                mcr = MCR_FIR;
                IRDA_DEBUG(0, "%s(), unknown baud rate of %d\n", 
                           __func__, speed);
                break;
        }

        /* Set appropriate speed mode */
        switch_bank(iobase, BANK0);
        outb(mcr | MCR_TX_DFR, iobase+MCR);

        /* Give some hits to the transceiver */
        nsc_ircc_change_dongle_speed(iobase, speed, self->io.dongle_id);

        /* Set FIFO threshold to TX17, RX16 */
        switch_bank(iobase, BANK0);
        outb(0x00, iobase+FCR);
        outb(FCR_FIFO_EN, iobase+FCR);
        outb(FCR_RXTH|     /* Set Rx FIFO threshold */
             FCR_TXTH|     /* Set Tx FIFO threshold */
             FCR_TXSR|     /* Reset Tx FIFO */
             FCR_RXSR|     /* Reset Rx FIFO */
             FCR_FIFO_EN,  /* Enable FIFOs */
             iobase+FCR);
        
        /* Set FIFO size to 32 */
        switch_bank(iobase, BANK2);
        outb(EXCR2_RFSIZ|EXCR2_TFSIZ, iobase+EXCR2);
        
        /* Enable some interrupts so we can receive frames */
        switch_bank(iobase, BANK0); 
        if (speed > 115200) {
                /* Install FIR xmit handler */
                dev->netdev_ops = &nsc_ircc_fir_ops;
                ier = IER_SFIF_IE;
                nsc_ircc_dma_receive(self);
        } else {
                /* Install SIR xmit handler */
                dev->netdev_ops = &nsc_ircc_sir_ops;
                ier = IER_RXHDL_IE;
        }
        /* Set our current interrupt mask */
        outb(ier, iobase+IER);
        
        /* Restore BSR */
        outb(bank, iobase+BSR);

        /* Make sure interrupt handlers keep the proper interrupt mask */
        return(ier);
}

/*
 * Function nsc_ircc_hard_xmit (skb, dev)
 *
 *    Transmit the frame!
 *
 */
static netdev_tx_t nsc_ircc_hard_xmit_sir(struct sk_buff *skb,
                                                struct net_device *dev)
{
        struct nsc_ircc_cb *self;
        unsigned long flags;
        int iobase;
        __s32 speed;
        __u8 bank;
        
        self = netdev_priv(dev);

        IRDA_ASSERT(self != NULL, return NETDEV_TX_OK;);

        iobase = self->io.fir_base;

        netif_stop_queue(dev);
                
        /* Make sure tests *& speed change are atomic */
        spin_lock_irqsave(&self->lock, flags);
        
        /* Check if we need to change the speed */
        speed = irda_get_next_speed(skb);
        if ((speed != self->io.speed) && (speed != -1)) {
                /* Check for empty frame. */
                if (!skb->len) {
                        /* If we just sent a frame, we get called before
                         * the last bytes get out (because of the SIR FIFO).
                         * If this is the case, let interrupt handler change
                         * the speed itself... Jean II */
                        if (self->io.direction == IO_RECV) {
                                nsc_ircc_change_speed(self, speed); 
                                /* TODO : For SIR->SIR, the next packet
                                 * may get corrupted - Jean II */
                                netif_wake_queue(dev);
                        } else {
                                self->new_speed = speed;
                                /* Queue will be restarted after speed change
                                 * to make sure packets gets through the
                                 * proper xmit handler - Jean II */
                        }
                        dev->trans_start = jiffies;
                        spin_unlock_irqrestore(&self->lock, flags);
                        dev_kfree_skb(skb);
                        return NETDEV_TX_OK;
                } else
                        self->new_speed = speed;
        }

        /* Save current bank */
        bank = inb(iobase+BSR);
        
        self->tx_buff.data = self->tx_buff.head;
        
        self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data, 
                                           self->tx_buff.truesize);

        dev->stats.tx_bytes += self->tx_buff.len;
        
        /* Add interrupt on tx low level (will fire immediately) */
        switch_bank(iobase, BANK0);
        outb(IER_TXLDL_IE, iobase+IER);
        
        /* Restore bank register */
        outb(bank, iobase+BSR);

        dev->trans_start = jiffies;
        spin_unlock_irqrestore(&self->lock, flags);

        dev_kfree_skb(skb);

        return NETDEV_TX_OK;
}

static netdev_tx_t nsc_ircc_hard_xmit_fir(struct sk_buff *skb,
                                                struct net_device *dev)
{
        struct nsc_ircc_cb *self;
        unsigned long flags;
        int iobase;
        __s32 speed;
        __u8 bank;
        int mtt, diff;
        
        self = netdev_priv(dev);
        iobase = self->io.fir_base;

        netif_stop_queue(dev);
        
        /* Make sure tests *& speed change are atomic */
        spin_lock_irqsave(&self->lock, flags);

        /* Check if we need to change the speed */
        speed = irda_get_next_speed(skb);
        if ((speed != self->io.speed) && (speed != -1)) {
                /* Check for empty frame. */
                if (!skb->len) {
                        /* If we are currently transmitting, defer to
                         * interrupt handler. - Jean II */
                        if(self->tx_fifo.len == 0) {
                                nsc_ircc_change_speed(self, speed); 
                                netif_wake_queue(dev);
                        } else {
                                self->new_speed = speed;
                                /* Keep queue stopped :
                                 * the speed change operation may change the
                                 * xmit handler, and we want to make sure
                                 * the next packet get through the proper
                                 * Tx path, so block the Tx queue until
                                 * the speed change has been done.
                                 * Jean II */
                        }
                        dev->trans_start = jiffies;
                        spin_unlock_irqrestore(&self->lock, flags);
                        dev_kfree_skb(skb);
                        return NETDEV_TX_OK;
                } else {
                        /* Change speed after current frame */
                        self->new_speed = speed;
                }
        }

        /* Save current bank */
        bank = inb(iobase+BSR);

        /* Register and copy this frame to DMA memory */
        self->tx_fifo.queue[self->tx_fifo.free].start = self->tx_fifo.tail;
        self->tx_fifo.queue[self->tx_fifo.free].len = skb->len;
        self->tx_fifo.tail += skb->len;

        dev->stats.tx_bytes += skb->len;

        skb_copy_from_linear_data(skb, self->tx_fifo.queue[self->tx_fifo.free].start,
                      skb->len);
        self->tx_fifo.len++;
        self->tx_fifo.free++;

        /* Start transmit only if there is currently no transmit going on */
        if (self->tx_fifo.len == 1) {
                /* Check if we must wait the min turn time or not */
                mtt = irda_get_mtt(skb);
                if (mtt) {
                        /* Check how much time we have used already */
                        do_gettimeofday(&self->now);
                        diff = self->now.tv_usec - self->stamp.tv_usec;
                        if (diff < 0) 
                                diff += 1000000;
                        
                        /* Check if the mtt is larger than the time we have
                         * already used by all the protocol processing
                         */
                        if (mtt > diff) {
                                mtt -= diff;

                                /* 
                                 * Use timer if delay larger than 125 us, and
                                 * use udelay for smaller values which should
                                 * be acceptable
                                 */
                                if (mtt > 125) {
                                        /* Adjust for timer resolution */
                                        mtt = mtt / 125;
                                        
                                        /* Setup timer */
                                        switch_bank(iobase, BANK4);
                                        outb(mtt & 0xff, iobase+TMRL);
                                        outb((mtt >> 8) & 0x0f, iobase+TMRH);
                                        
                                        /* Start timer */
                                        outb(IRCR1_TMR_EN, iobase+IRCR1);
                                        self->io.direction = IO_XMIT;
                                        
                                        /* Enable timer interrupt */
                                        switch_bank(iobase, BANK0);
                                        outb(IER_TMR_IE, iobase+IER);
                                        
                                        /* Timer will take care of the rest */
                                        goto out; 
                                } else
                                        udelay(mtt);
                        }
                }               
                /* Enable DMA interrupt */
                switch_bank(iobase, BANK0);
                outb(IER_DMA_IE, iobase+IER);

                /* Transmit frame */
                nsc_ircc_dma_xmit(self, iobase);
        }
 out:
        /* Not busy transmitting anymore if window is not full,
         * and if we don't need to change speed */
        if ((self->tx_fifo.free < MAX_TX_WINDOW) && (self->new_speed == 0))
                netif_wake_queue(self->netdev);

        /* Restore bank register */
        outb(bank, iobase+BSR);

        dev->trans_start = jiffies;
        spin_unlock_irqrestore(&self->lock, flags);
        dev_kfree_skb(skb);

        return NETDEV_TX_OK;
}

/*
 * Function nsc_ircc_dma_xmit (self, iobase)
 *
 *    Transmit data using DMA
 *
 */
static void nsc_ircc_dma_xmit(struct nsc_ircc_cb *self, int iobase)
{
        int bsr;

        /* Save current bank */
        bsr = inb(iobase+BSR);

        /* Disable DMA */
        switch_bank(iobase, BANK0);
        outb(inb(iobase+MCR) & ~MCR_DMA_EN, iobase+MCR);
        
        self->io.direction = IO_XMIT;
        
        /* Choose transmit DMA channel  */ 
        switch_bank(iobase, BANK2);
        outb(ECR1_DMASWP|ECR1_DMANF|ECR1_EXT_SL, iobase+ECR1);
        
        irda_setup_dma(self->io.dma, 
                       ((u8 *)self->tx_fifo.queue[self->tx_fifo.ptr].start -
                        self->tx_buff.head) + self->tx_buff_dma,
                       self->tx_fifo.queue[self->tx_fifo.ptr].len, 
                       DMA_TX_MODE);

        /* Enable DMA and SIR interaction pulse */
        switch_bank(iobase, BANK0);     
        outb(inb(iobase+MCR)|MCR_TX_DFR|MCR_DMA_EN|MCR_IR_PLS, iobase+MCR);

        /* Restore bank register */
        outb(bsr, iobase+BSR);
}

/*
 * Function nsc_ircc_pio_xmit (self, iobase)
 *
 *    Transmit data using PIO. Returns the number of bytes that actually
 *    got transferred
 *
 */
static int nsc_ircc_pio_write(int iobase, __u8 *buf, int len, int fifo_size)
{
        int actual = 0;
        __u8 bank;
        
        IRDA_DEBUG(4, "%s()\n", __func__);

        /* Save current bank */
        bank = inb(iobase+BSR);

        switch_bank(iobase, BANK0);
        if (!(inb_p(iobase+LSR) & LSR_TXEMP)) {
                IRDA_DEBUG(4, "%s(), warning, FIFO not empty yet!\n",
                           __func__);

                /* FIFO may still be filled to the Tx interrupt threshold */
                fifo_size -= 17;
        }

        /* Fill FIFO with current frame */
        while ((fifo_size-- > 0) && (actual < len)) {
                /* Transmit next byte */
                outb(buf[actual++], iobase+TXD);
        }
        
        IRDA_DEBUG(4, "%s(), fifo_size %d ; %d sent of %d\n", 
                   __func__, fifo_size, actual, len);
        
        /* Restore bank */
        outb(bank, iobase+BSR);

        return actual;
}

/*
 * Function nsc_ircc_dma_xmit_complete (self)
 *
 *    The transfer of a frame in finished. This function will only be called 
 *    by the interrupt handler
 *
 */
static int nsc_ircc_dma_xmit_complete(struct nsc_ircc_cb *self)
{
        int iobase;
        __u8 bank;
        int ret = TRUE;

        IRDA_DEBUG(2, "%s()\n", __func__);

        iobase = self->io.fir_base;

        /* Save current bank */
        bank = inb(iobase+BSR);

        /* Disable DMA */
        switch_bank(iobase, BANK0);
        outb(inb(iobase+MCR) & ~MCR_DMA_EN, iobase+MCR);
        
        /* Check for underrrun! */
        if (inb(iobase+ASCR) & ASCR_TXUR) {
                self->netdev->stats.tx_errors++;
                self->netdev->stats.tx_fifo_errors++;
                
                /* Clear bit, by writing 1 into it */
                outb(ASCR_TXUR, iobase+ASCR);
        } else {
                self->netdev->stats.tx_packets++;
        }

        /* Finished with this frame, so prepare for next */
        self->tx_fifo.ptr++;
        self->tx_fifo.len--;

        /* Any frames to be sent back-to-back? */
        if (self->tx_fifo.len) {
                nsc_ircc_dma_xmit(self, iobase);
                
                /* Not finished yet! */
                ret = FALSE;
        } else {
                /* Reset Tx FIFO info */
                self->tx_fifo.len = self->tx_fifo.ptr = self->tx_fifo.free = 0;
                self->tx_fifo.tail = self->tx_buff.head;
        }

        /* Make sure we have room for more frames and
         * that we don't need to change speed */
        if ((self->tx_fifo.free < MAX_TX_WINDOW) && (self->new_speed == 0)) {
                /* Not busy transmitting anymore */
                /* Tell the network layer, that we can accept more frames */
                netif_wake_queue(self->netdev);
        }

        /* Restore bank */
        outb(bank, iobase+BSR);
        
        return ret;
}

/*
 * Function nsc_ircc_dma_receive (self)
 *
 *    Get ready for receiving a frame. The device will initiate a DMA
 *    if it starts to receive a frame.
 *
 */
static int nsc_ircc_dma_receive(struct nsc_ircc_cb *self) 
{
        int iobase;
        __u8 bsr;

        iobase = self->io.fir_base;

        /* Reset Tx FIFO info */
        self->tx_fifo.len = self->tx_fifo.ptr = self->tx_fifo.free = 0;
        self->tx_fifo.tail = self->tx_buff.head;

        /* Save current bank */
        bsr = inb(iobase+BSR);

        /* Disable DMA */
        switch_bank(iobase, BANK0);
        outb(inb(iobase+MCR) & ~MCR_DMA_EN, iobase+MCR);

        /* Choose DMA Rx, DMA Fairness, and Advanced mode */
        switch_bank(iobase, BANK2);
        outb(ECR1_DMANF|ECR1_EXT_SL, iobase+ECR1);

        self->io.direction = IO_RECV;
        self->rx_buff.data = self->rx_buff.head;
        
        /* Reset Rx FIFO. This will also flush the ST_FIFO */
        switch_bank(iobase, BANK0);
        outb(FCR_RXSR|FCR_FIFO_EN, iobase+FCR);

        self->st_fifo.len = self->st_fifo.pending_bytes = 0;
        self->st_fifo.tail = self->st_fifo.head = 0;
        
        irda_setup_dma(self->io.dma, self->rx_buff_dma, self->rx_buff.truesize,
                       DMA_RX_MODE);

        /* Enable DMA */
        switch_bank(iobase, BANK0);
        outb(inb(iobase+MCR)|MCR_DMA_EN, iobase+MCR);

        /* Restore bank register */
        outb(bsr, iobase+BSR);
        
        return 0;
}

/*
 * Function nsc_ircc_dma_receive_complete (self)
 *
 *    Finished with receiving frames
 *
 *    
 */
static int nsc_ircc_dma_receive_complete(struct nsc_ircc_cb *self, int iobase)
{
        struct st_fifo *st_fifo;
        struct sk_buff *skb;
        __u8 status;
        __u8 bank;
        int len;

        st_fifo = &self->st_fifo;

        /* Save current bank */
        bank = inb(iobase+BSR);
        
        /* Read all entries in status FIFO */
        switch_bank(iobase, BANK5);
        while ((status = inb(iobase+FRM_ST)) & FRM_ST_VLD) {
                /* We must empty the status FIFO no matter what */
                len = inb(iobase+RFLFL) | ((inb(iobase+RFLFH) & 0x1f) << 8);

                if (st_fifo->tail >= MAX_RX_WINDOW) {
                        IRDA_DEBUG(0, "%s(), window is full!\n", __func__);
                        continue;
                }
                        
                st_fifo->entries[st_fifo->tail].status = status;
                st_fifo->entries[st_fifo->tail].len = len;
                st_fifo->pending_bytes += len;
                st_fifo->tail++;
                st_fifo->len++;
        }
        /* Try to process all entries in status FIFO */
        while (st_fifo->len > 0) {
                /* Get first entry */
                status = st_fifo->entries[st_fifo->head].status;
                len    = st_fifo->entries[st_fifo->head].len;
                st_fifo->pending_bytes -= len;
                st_fifo->head++;
                st_fifo->len--;

                /* Check for errors */
                if (status & FRM_ST_ERR_MSK) {
                        if (status & FRM_ST_LOST_FR) {
                                /* Add number of lost frames to stats */
                                self->netdev->stats.rx_errors += len;
                        } else {
                                /* Skip frame */
                                self->netdev->stats.rx_errors++;
                                
                                self->rx_buff.data += len;
                        
                                if (status & FRM_ST_MAX_LEN)
                                        self->netdev->stats.rx_length_errors++;
                                
                                if (status & FRM_ST_PHY_ERR) 
                                        self->netdev->stats.rx_frame_errors++;
                                
                                if (status & FRM_ST_BAD_CRC) 
                                        self->netdev->stats.rx_crc_errors++;
                        }
                        /* The errors below can be reported in both cases */
                        if (status & FRM_ST_OVR1)
                                self->netdev->stats.rx_fifo_errors++;
                        
                        if (status & FRM_ST_OVR2)
                                self->netdev->stats.rx_fifo_errors++;
                } else {
                        /*  
                         * First we must make sure that the frame we
                         * want to deliver is all in main memory. If we
                         * cannot tell, then we check if the Rx FIFO is
                         * empty. If not then we will have to take a nap
                         * and try again later.  
                         */
                        if (st_fifo->pending_bytes < self->io.fifo_size) {
                                switch_bank(iobase, BANK0);
                                if (inb(iobase+LSR) & LSR_RXDA) {
                                        /* Put this entry back in fifo */
                                        st_fifo->head--;
                                        st_fifo->len++;
                                        st_fifo->pending_bytes += len;
                                        st_fifo->entries[st_fifo->head].status = status;
                                        st_fifo->entries[st_fifo->head].len = len;
                                        /*  
                                         * DMA not finished yet, so try again 
                                         * later, set timer value, resolution 
                                         * 125 us 
                                         */
                                        switch_bank(iobase, BANK4);
                                        outb(0x02, iobase+TMRL); /* x 125 us */
                                        outb(0x00, iobase+TMRH);

                                        /* Start timer */
                                        outb(IRCR1_TMR_EN, iobase+IRCR1);

                                        /* Restore bank register */
                                        outb(bank, iobase+BSR);
                                        
                                        return FALSE; /* I'll be back! */
                                }
                        }

                        /* 
                         * Remember the time we received this frame, so we can
                         * reduce the min turn time a bit since we will know
                         * how much time we have used for protocol processing
                         */
                        do_gettimeofday(&self->stamp);

                        skb = dev_alloc_skb(len+1);
                        if (skb == NULL)  {
                                IRDA_WARNING("%s(), memory squeeze, "
                                             "dropping frame.\n",
                                             __func__);
                                self->netdev->stats.rx_dropped++;

                                /* Restore bank register */
                                outb(bank, iobase+BSR);

                                return FALSE;
                        }
                        
                        /* Make sure IP header gets aligned */
                        skb_reserve(skb, 1); 

                        /* Copy frame without CRC */
                        if (self->io.speed < 4000000) {
                                skb_put(skb, len-2);
                                skb_copy_to_linear_data(skb,
                                                        self->rx_buff.data,
                                                        len - 2);
                        } else {
                                skb_put(skb, len-4);
                                skb_copy_to_linear_data(skb,
                                                        self->rx_buff.data,
                                                        len - 4);
                        }

                        /* Move to next frame */
                        self->rx_buff.data += len;
                        self->netdev->stats.rx_bytes += len;
                        self->netdev->stats.rx_packets++;

                        skb->dev = self->netdev;
                        skb_reset_mac_header(skb);
                        skb->protocol = htons(ETH_P_IRDA);
                        netif_rx(skb);
                }
        }
        /* Restore bank register */
        outb(bank, iobase+BSR);

        return TRUE;
}

/*
 * Function nsc_ircc_pio_receive (self)
 *
 *    Receive all data in receiver FIFO
 *
 */
static void nsc_ircc_pio_receive(struct nsc_ircc_cb *self) 
{
        __u8 byte;
        int iobase;

        iobase = self->io.fir_base;
        
        /*  Receive all characters in Rx FIFO */
        do {
                byte = inb(iobase+RXD);
                async_unwrap_char(self->netdev, &self->netdev->stats,
                                  &self->rx_buff, byte);
        } while (inb(iobase+LSR) & LSR_RXDA); /* Data available */      
}

/*
 * Function nsc_ircc_sir_interrupt (self, eir)
 *
 *    Handle SIR interrupt
 *
 */
static void nsc_ircc_sir_interrupt(struct nsc_ircc_cb *self, int eir)
{
        int actual;

        /* Check if transmit FIFO is low on data */
        if (eir & EIR_TXLDL_EV) {
                /* Write data left in transmit buffer */
                actual = nsc_ircc_pio_write(self->io.fir_base, 
                                           self->tx_buff.data, 
                                           self->tx_buff.len, 
                                           self->io.fifo_size);
                self->tx_buff.data += actual;
                self->tx_buff.len  -= actual;
                
                self->io.direction = IO_XMIT;

                /* Check if finished */
                if (self->tx_buff.len > 0)
                        self->ier = IER_TXLDL_IE;
                else { 

                        self->netdev->stats.tx_packets++;
                        netif_wake_queue(self->netdev);
                        self->ier = IER_TXEMP_IE;
                }
                        
        }
        /* Check if transmission has completed */
        if (eir & EIR_TXEMP_EV) {
                /* Turn around and get ready to receive some data */
                self->io.direction = IO_RECV;
                self->ier = IER_RXHDL_IE;
                /* Check if we need to change the speed?
                 * Need to be after self->io.direction to avoid race with
                 * nsc_ircc_hard_xmit_sir() - Jean II */
                if (self->new_speed) {
                        IRDA_DEBUG(2, "%s(), Changing speed!\n", __func__);
                        self->ier = nsc_ircc_change_speed(self,
                                                          self->new_speed);
                        self->new_speed = 0;
                        netif_wake_queue(self->netdev);

                        /* Check if we are going to FIR */
                        if (self->io.speed > 115200) {
                                /* No need to do anymore SIR stuff */
                                return;
                        }
                }
        }

        /* Rx FIFO threshold or timeout */
        if (eir & EIR_RXHDL_EV) {
                nsc_ircc_pio_receive(self);

                /* Keep receiving */
                self->ier = IER_RXHDL_IE;
        }
}

/*
 * Function nsc_ircc_fir_interrupt (self, eir)
 *
 *    Handle MIR/FIR interrupt
 *
 */
static void nsc_ircc_fir_interrupt(struct nsc_ircc_cb *self, int iobase, 
                                   int eir)
{
        __u8 bank;

        bank = inb(iobase+BSR);
        
        /* Status FIFO event*/
        if (eir & EIR_SFIF_EV) {
                /* Check if DMA has finished */
                if (nsc_ircc_dma_receive_complete(self, iobase)) {
                        /* Wait for next status FIFO interrupt */
                        self->ier = IER_SFIF_IE;
                } else {
                        self->ier = IER_SFIF_IE | IER_TMR_IE;
                }
        } else if (eir & EIR_TMR_EV) { /* Timer finished */
                /* Disable timer */
                switch_bank(iobase, BANK4);
                outb(0, iobase+IRCR1);

                /* Clear timer event */
                switch_bank(iobase, BANK0);
                outb(ASCR_CTE, iobase+ASCR);

                /* Check if this is a Tx timer interrupt */
                if (self->io.direction == IO_XMIT) {
                        nsc_ircc_dma_xmit(self, iobase);

                        /* Interrupt on DMA */
                        self->ier = IER_DMA_IE;
                } else {
                        /* Check (again) if DMA has finished */
                        if (nsc_ircc_dma_receive_complete(self, iobase)) {
                                self->ier = IER_SFIF_IE;
                        } else {
                                self->ier = IER_SFIF_IE | IER_TMR_IE;
                        }
                }
        } else if (eir & EIR_DMA_EV) {
                /* Finished with all transmissions? */
                if (nsc_ircc_dma_xmit_complete(self)) {
                        if(self->new_speed != 0) {
                                /* As we stop the Tx queue, the speed change
                                 * need to be done when the Tx fifo is
                                 * empty. Ask for a Tx done interrupt */
                                self->ier = IER_TXEMP_IE;
                        } else {
                                /* Check if there are more frames to be
                                 * transmitted */
                                if (irda_device_txqueue_empty(self->netdev)) {
                                        /* Prepare for receive */
                                        nsc_ircc_dma_receive(self);
                                        self->ier = IER_SFIF_IE;
                                } else
                                        IRDA_WARNING("%s(), potential "
                                                     "Tx queue lockup !\n",
                                                     __func__);
                        }
                } else {
                        /*  Not finished yet, so interrupt on DMA again */
                        self->ier = IER_DMA_IE;
                }
        } else if (eir & EIR_TXEMP_EV) {
                /* The Tx FIFO has totally drained out, so now we can change
                 * the speed... - Jean II */
                self->ier = nsc_ircc_change_speed(self, self->new_speed);
                self->new_speed = 0;
                netif_wake_queue(self->netdev);
                /* Note : nsc_ircc_change_speed() restarted Rx fifo */
        }

        outb(bank, iobase+BSR);
}

/*
 * Function nsc_ircc_interrupt (irq, dev_id, regs)
 *
 *    An interrupt from the chip has arrived. Time to do some work
 *
 */
static irqreturn_t nsc_ircc_interrupt(int irq, void *dev_id)
{
        struct net_device *dev = dev_id;
        struct nsc_ircc_cb *self;
        __u8 bsr, eir;
        int iobase;

        self = netdev_priv(dev);

        spin_lock(&self->lock); 

        iobase = self->io.fir_base;

        bsr = inb(iobase+BSR);  /* Save current bank */

        switch_bank(iobase, BANK0);     
        self->ier = inb(iobase+IER); 
        eir = inb(iobase+EIR) & self->ier; /* Mask out the interesting ones */ 

        outb(0, iobase+IER); /* Disable interrupts */
        
        if (eir) {
                /* Dispatch interrupt handler for the current speed */
                if (self->io.speed > 115200)
                        nsc_ircc_fir_interrupt(self, iobase, eir);
                else
                        nsc_ircc_sir_interrupt(self, eir);
        }
        
        outb(self->ier, iobase+IER); /* Restore interrupts */
        outb(bsr, iobase+BSR);       /* Restore bank register */

        spin_unlock(&self->lock);
        return IRQ_RETVAL(eir);
}

/*
 * Function nsc_ircc_is_receiving (self)
 *
 *    Return TRUE is we are currently receiving a frame
 *
 */
static int nsc_ircc_is_receiving(struct nsc_ircc_cb *self)
{
        unsigned long flags;
        int status = FALSE;
        int iobase;
        __u8 bank;

        IRDA_ASSERT(self != NULL, return FALSE;);

        spin_lock_irqsave(&self->lock, flags);

        if (self->io.speed > 115200) {
                iobase = self->io.fir_base;

                /* Check if rx FIFO is not empty */
                bank = inb(iobase+BSR);
                switch_bank(iobase, BANK2);
                if ((inb(iobase+RXFLV) & 0x3f) != 0) {
                        /* We are receiving something */
                        status =  TRUE;
                }
                outb(bank, iobase+BSR);
        } else 
                status = (self->rx_buff.state != OUTSIDE_FRAME);
        
        spin_unlock_irqrestore(&self->lock, flags);

        return status;
}

/*
 * Function nsc_ircc_net_open (dev)
 *
 *    Start the device
 *
 */
static int nsc_ircc_net_open(struct net_device *dev)
{
        struct nsc_ircc_cb *self;
        int iobase;
        char hwname[32];
        __u8 bank;
        
        IRDA_DEBUG(4, "%s()\n", __func__);
        
        IRDA_ASSERT(dev != NULL, return -1;);
        self = netdev_priv(dev);
        
        IRDA_ASSERT(self != NULL, return 0;);
        
        iobase = self->io.fir_base;
        
        if (request_irq(self->io.irq, nsc_ircc_interrupt, 0, dev->name, dev)) {
                IRDA_WARNING("%s, unable to allocate irq=%d\n",
                             driver_name, self->io.irq);
                return -EAGAIN;
        }
        /*
         * Always allocate the DMA channel after the IRQ, and clean up on 
         * failure.
         */
        if (request_dma(self->io.dma, dev->name)) {
                IRDA_WARNING("%s, unable to allocate dma=%d\n",
                             driver_name, self->io.dma);
                free_irq(self->io.irq, dev);
                return -EAGAIN;
        }
        
        /* Save current bank */
        bank = inb(iobase+BSR);
        
        /* turn on interrupts */
        switch_bank(iobase, BANK0);
        outb(IER_LS_IE | IER_RXHDL_IE, iobase+IER);

        /* Restore bank register */
        outb(bank, iobase+BSR);

        /* Ready to play! */
        netif_start_queue(dev);
        
        /* Give self a hardware name */
        sprintf(hwname, "NSC-FIR @ 0x%03x", self->io.fir_base);

        /* 
         * Open new IrLAP layer instance, now that everything should be
         * initialized properly 
         */
        self->irlap = irlap_open(dev, &self->qos, hwname);

        return 0;
}

/*
 * Function nsc_ircc_net_close (dev)
 *
 *    Stop the device
 *
 */
static int nsc_ircc_net_close(struct net_device *dev)
{
        struct nsc_ircc_cb *self;
        int iobase;
        __u8 bank;

        IRDA_DEBUG(4, "%s()\n", __func__);
        
        IRDA_ASSERT(dev != NULL, return -1;);

        self = netdev_priv(dev);
        IRDA_ASSERT(self != NULL, return 0;);

        /* Stop device */
        netif_stop_queue(dev);
        
        /* Stop and remove instance of IrLAP */
        if (self->irlap)
                irlap_close(self->irlap);
        self->irlap = NULL;
        
        iobase = self->io.fir_base;

        disable_dma(self->io.dma);

        /* Save current bank */
        bank = inb(iobase+BSR);

        /* Disable interrupts */
        switch_bank(iobase, BANK0);
        outb(0, iobase+IER); 
       
        free_irq(self->io.irq, dev);
        free_dma(self->io.dma);

        /* Restore bank register */
        outb(bank, iobase+BSR);

        return 0;
}

/*
 * Function nsc_ircc_net_ioctl (dev, rq, cmd)
 *
 *    Process IOCTL commands for this device
 *
 */
static int nsc_ircc_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
        struct if_irda_req *irq = (struct if_irda_req *) rq;
        struct nsc_ircc_cb *self;
        unsigned long flags;
        int ret = 0;

        IRDA_ASSERT(dev != NULL, return -1;);

        self = netdev_priv(dev);

        IRDA_ASSERT(self != NULL, return -1;);

        IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __func__, dev->name, cmd);
        
        switch (cmd) {
        case SIOCSBANDWIDTH: /* Set bandwidth */
                if (!capable(CAP_NET_ADMIN)) {
                        ret = -EPERM;
                        break;
                }
                spin_lock_irqsave(&self->lock, flags);
                nsc_ircc_change_speed(self, irq->ifr_baudrate);
                spin_unlock_irqrestore(&self->lock, flags);
                break;
        case SIOCSMEDIABUSY: /* Set media busy */
                if (!capable(CAP_NET_ADMIN)) {
                        ret = -EPERM;
                        break;
                }
                irda_device_set_media_busy(self->netdev, TRUE);
                break;
        case SIOCGRECEIVING: /* Check if we are receiving right now */
                /* This is already protected */
                irq->ifr_receiving = nsc_ircc_is_receiving(self);
                break;
        default:
                ret = -EOPNOTSUPP;
        }
        return ret;
}

static int nsc_ircc_suspend(struct platform_device *dev, pm_message_t state)
{
        struct nsc_ircc_cb *self = platform_get_drvdata(dev);
        int bank;
        unsigned long flags;
        int iobase = self->io.fir_base;

        if (self->io.suspended)
                return 0;

        IRDA_DEBUG(1, "%s, Suspending\n", driver_name);

        rtnl_lock();
        if (netif_running(self->netdev)) {
                netif_device_detach(self->netdev);
                spin_lock_irqsave(&self->lock, flags);
                /* Save current bank */
                bank = inb(iobase+BSR);

                /* Disable interrupts */
                switch_bank(iobase, BANK0);
                outb(0, iobase+IER);

                /* Restore bank register */
                outb(bank, iobase+BSR);

                spin_unlock_irqrestore(&self->lock, flags);
                free_irq(self->io.irq, self->netdev);
                disable_dma(self->io.dma);
        }
        self->io.suspended = 1;
        rtnl_unlock();

        return 0;
}

static int nsc_ircc_resume(struct platform_device *dev)
{
        struct nsc_ircc_cb *self = platform_get_drvdata(dev);
        unsigned long flags;

        if (!self->io.suspended)
                return 0;

        IRDA_DEBUG(1, "%s, Waking up\n", driver_name);

        rtnl_lock();
        nsc_ircc_setup(&self->io);
        nsc_ircc_init_dongle_interface(self->io.fir_base, self->io.dongle_id);

        if (netif_running(self->netdev)) {
                if (request_irq(self->io.irq, nsc_ircc_interrupt, 0,
                                self->netdev->name, self->netdev)) {
                        IRDA_WARNING("%s, unable to allocate irq=%d\n",
                                     driver_name, self->io.irq);

                        /*
                         * Don't fail resume process, just kill this
                         * network interface
                         */
                        unregister_netdevice(self->netdev);
                } else {
                        spin_lock_irqsave(&self->lock, flags);
                        nsc_ircc_change_speed(self, self->io.speed);
                        spin_unlock_irqrestore(&self->lock, flags);
                        netif_device_attach(self->netdev);
                }

        } else {
                spin_lock_irqsave(&self->lock, flags);
                nsc_ircc_change_speed(self, 9600);
                spin_unlock_irqrestore(&self->lock, flags);
        }
        self->io.suspended = 0;
        rtnl_unlock();

        return 0;
}

MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
MODULE_DESCRIPTION("NSC IrDA Device Driver");
MODULE_LICENSE("GPL");


module_param(qos_mtt_bits, int, 0);
MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time");
module_param_array(io, int, NULL, 0);
MODULE_PARM_DESC(io, "Base I/O addresses");
module_param_array(irq, int, NULL, 0);
MODULE_PARM_DESC(irq, "IRQ lines");
module_param_array(dma, int, NULL, 0);
MODULE_PARM_DESC(dma, "DMA channels");
module_param(dongle_id, int, 0);
MODULE_PARM_DESC(dongle_id, "Type-id of used dongle");

module_init(nsc_ircc_init);
module_exit(nsc_ircc_cleanup);