/********************************************************************
 Filename:      via-ircc.c
 Version:       1.0 
 Description:   Driver for the VIA VT8231/VT8233 IrDA chipsets
 Author:        VIA Technologies,inc
 Date  :        08/06/2003

Copyright (c) 1998-2003 VIA Technologies, Inc.

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, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTIES OR REPRESENTATIONS; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

F01 Oct/02/02: Modify code for V0.11(move out back to back transfer)
F02 Oct/28/02: Add SB device ID for 3147 and 3177.
 Comment :
       jul/09/2002 : only implement two kind of dongle currently.
       Oct/02/2002 : work on VT8231 and VT8233 .
       Aug/06/2003 : change driver format to pci driver .

2004-02-16: <sda@bdit.de>
- Removed unneeded 'legacy' pci stuff.
- Make sure SIR mode is set (hw_init()) before calling mode-dependent stuff.
- On speed change from core, don't send SIR frame with new speed. 
  Use current speed and change speeds later.
- Make module-param dongle_id actually work.
- New dongle_id 17 (0x11): TDFS4500. Single-ended SIR only. 
  Tested with home-grown PCB on EPIA boards.
- Code cleanup.
       
 ********************************************************************/
#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/init.h>
#include <linux/interrupt.h>
#include <linux/rtnetlink.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/gfp.h>

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

#include <linux/pm.h>

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

#include "via-ircc.h"

#define VIA_MODULE_NAME "via-ircc"
#define CHIP_IO_EXTENT 0x40

static char *driver_name = VIA_MODULE_NAME;

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

/* We can't guess the type of connected dongle, user *must* supply it. */
module_param(dongle_id, int, 0);

/* Some prototypes */
static int via_ircc_open(struct pci_dev *pdev, chipio_t *info,
                         unsigned int id);
static int via_ircc_dma_receive(struct via_ircc_cb *self);
static int via_ircc_dma_receive_complete(struct via_ircc_cb *self,
                                         int iobase);
static netdev_tx_t via_ircc_hard_xmit_sir(struct sk_buff *skb,
                                                struct net_device *dev);
static netdev_tx_t via_ircc_hard_xmit_fir(struct sk_buff *skb,
                                                struct net_device *dev);
static void via_hw_init(struct via_ircc_cb *self);
static void via_ircc_change_speed(struct via_ircc_cb *self, __u32 baud);
static irqreturn_t via_ircc_interrupt(int irq, void *dev_id);
static int via_ircc_is_receiving(struct via_ircc_cb *self);
static int via_ircc_read_dongle_id(int iobase);

static int via_ircc_net_open(struct net_device *dev);
static int via_ircc_net_close(struct net_device *dev);
static int via_ircc_net_ioctl(struct net_device *dev, struct ifreq *rq,
                              int cmd);
static void via_ircc_change_dongle_speed(int iobase, int speed,
                                         int dongle_id);
static int RxTimerHandler(struct via_ircc_cb *self, int iobase);
static void hwreset(struct via_ircc_cb *self);
static int via_ircc_dma_xmit(struct via_ircc_cb *self, u16 iobase);
static int upload_rxdata(struct via_ircc_cb *self, int iobase);
static int via_init_one(struct pci_dev *pcidev, const struct pci_device_id *id);
static void via_remove_one(struct pci_dev *pdev);

/* FIXME : Should use udelay() instead, even if we are x86 only - Jean II */
static void iodelay(int udelay)
{
        u8 data;
        int i;

        for (i = 0; i < udelay; i++) {
                data = inb(0x80);
        }
}

static DEFINE_PCI_DEVICE_TABLE(via_pci_tbl) = {
        { PCI_VENDOR_ID_VIA, 0x8231, PCI_ANY_ID, PCI_ANY_ID,0,0,0 },
        { PCI_VENDOR_ID_VIA, 0x3109, PCI_ANY_ID, PCI_ANY_ID,0,0,1 },
        { PCI_VENDOR_ID_VIA, 0x3074, PCI_ANY_ID, PCI_ANY_ID,0,0,2 },
        { PCI_VENDOR_ID_VIA, 0x3147, PCI_ANY_ID, PCI_ANY_ID,0,0,3 },
        { PCI_VENDOR_ID_VIA, 0x3177, PCI_ANY_ID, PCI_ANY_ID,0,0,4 },
        { 0, }
};

MODULE_DEVICE_TABLE(pci,via_pci_tbl);


static struct pci_driver via_driver = {
        .name           = VIA_MODULE_NAME,
        .id_table       = via_pci_tbl,
        .probe          = via_init_one,
        .remove         = via_remove_one,
};


/*
 * Function via_ircc_init ()
 *
 *    Initialize chip. Just find out chip type and resource.
 */
static int __init via_ircc_init(void)
{
        int rc;

        IRDA_DEBUG(3, "%s()\n", __func__);

        rc = pci_register_driver(&via_driver);
        if (rc < 0) {
                IRDA_DEBUG(0, "%s(): error rc = %d, returning  -ENODEV...\n",
                           __func__, rc);
                return -ENODEV;
        }
        return 0;
}

static int via_init_one(struct pci_dev *pcidev, const struct pci_device_id *id)
{
        int rc;
        u8 temp,oldPCI_40,oldPCI_44,bTmp,bTmp1;
        u16 Chipset,FirDRQ1,FirDRQ0,FirIRQ,FirIOBase;
        chipio_t info;

        IRDA_DEBUG(2, "%s(): Device ID=(0X%X)\n", __func__, id->device);

        rc = pci_enable_device (pcidev);
        if (rc) {
                IRDA_DEBUG(0, "%s(): error rc = %d\n", __func__, rc);
                return -ENODEV;
        }

        // South Bridge exist
        if ( ReadLPCReg(0x20) != 0x3C )
                Chipset=0x3096;
        else
                Chipset=0x3076;

        if (Chipset==0x3076) {
                IRDA_DEBUG(2, "%s(): Chipset = 3076\n", __func__);

                WriteLPCReg(7,0x0c );
                temp=ReadLPCReg(0x30);//check if BIOS Enable Fir
                if((temp&0x01)==1) {   // BIOS close or no FIR
                        WriteLPCReg(0x1d, 0x82 );
                        WriteLPCReg(0x23,0x18);
                        temp=ReadLPCReg(0xF0);
                        if((temp&0x01)==0) {
                                temp=(ReadLPCReg(0x74)&0x03);    //DMA
                                FirDRQ0=temp + 4;
                                temp=(ReadLPCReg(0x74)&0x0C) >> 2;
                                FirDRQ1=temp + 4;
                        } else {
                                temp=(ReadLPCReg(0x74)&0x0C) >> 2;    //DMA
                                FirDRQ0=temp + 4;
                                FirDRQ1=FirDRQ0;
                        }
                        FirIRQ=(ReadLPCReg(0x70)&0x0f);         //IRQ
                        FirIOBase=ReadLPCReg(0x60 ) << 8;       //IO Space :high byte
                        FirIOBase=FirIOBase| ReadLPCReg(0x61) ; //low byte
                        FirIOBase=FirIOBase  ;
                        info.fir_base=FirIOBase;
                        info.irq=FirIRQ;
                        info.dma=FirDRQ1;
                        info.dma2=FirDRQ0;
                        pci_read_config_byte(pcidev,0x40,&bTmp);
                        pci_write_config_byte(pcidev,0x40,((bTmp | 0x08) & 0xfe));
                        pci_read_config_byte(pcidev,0x42,&bTmp);
                        pci_write_config_byte(pcidev,0x42,(bTmp | 0xf0));
                        pci_write_config_byte(pcidev,0x5a,0xc0);
                        WriteLPCReg(0x28, 0x70 );
                        if (via_ircc_open(pcidev, &info, 0x3076) == 0)
                                rc=0;
                } else
                        rc = -ENODEV; //IR not turn on   
        } else { //Not VT1211
                IRDA_DEBUG(2, "%s(): Chipset = 3096\n", __func__);

                pci_read_config_byte(pcidev,0x67,&bTmp);//check if BIOS Enable Fir
                if((bTmp&0x01)==1) {  // BIOS enable FIR
                        //Enable Double DMA clock
                        pci_read_config_byte(pcidev,0x42,&oldPCI_40);
                        pci_write_config_byte(pcidev,0x42,oldPCI_40 | 0x80);
                        pci_read_config_byte(pcidev,0x40,&oldPCI_40);
                        pci_write_config_byte(pcidev,0x40,oldPCI_40 & 0xf7);
                        pci_read_config_byte(pcidev,0x44,&oldPCI_44);
                        pci_write_config_byte(pcidev,0x44,0x4e);
  //---------- read configuration from Function0 of south bridge
                        if((bTmp&0x02)==0) {
                                pci_read_config_byte(pcidev,0x44,&bTmp1); //DMA
                                FirDRQ0 = (bTmp1 & 0x30) >> 4;
                                pci_read_config_byte(pcidev,0x44,&bTmp1);
                                FirDRQ1 = (bTmp1 & 0xc0) >> 6;
                        } else  {
                                pci_read_config_byte(pcidev,0x44,&bTmp1);    //DMA
                                FirDRQ0 = (bTmp1 & 0x30) >> 4 ;
                                FirDRQ1=0;
                        }
                        pci_read_config_byte(pcidev,0x47,&bTmp1);  //IRQ
                        FirIRQ = bTmp1 & 0x0f;

                        pci_read_config_byte(pcidev,0x69,&bTmp);
                        FirIOBase = bTmp << 8;//hight byte
                        pci_read_config_byte(pcidev,0x68,&bTmp);
                        FirIOBase = (FirIOBase | bTmp ) & 0xfff0;
  //-------------------------
                        info.fir_base=FirIOBase;
                        info.irq=FirIRQ;
                        info.dma=FirDRQ1;
                        info.dma2=FirDRQ0;
                        if (via_ircc_open(pcidev, &info, 0x3096) == 0)
                                rc=0;
                } else
                        rc = -ENODEV; //IR not turn on !!!!!
        }//Not VT1211

        IRDA_DEBUG(2, "%s(): End - rc = %d\n", __func__, rc);
        return rc;
}

static void __exit via_ircc_cleanup(void)
{
        IRDA_DEBUG(3, "%s()\n", __func__);

        /* Cleanup all instances of the driver */
        pci_unregister_driver (&via_driver); 
}

static const struct net_device_ops via_ircc_sir_ops = {
        .ndo_start_xmit = via_ircc_hard_xmit_sir,
        .ndo_open = via_ircc_net_open,
        .ndo_stop = via_ircc_net_close,
        .ndo_do_ioctl = via_ircc_net_ioctl,
};
static const struct net_device_ops via_ircc_fir_ops = {
        .ndo_start_xmit = via_ircc_hard_xmit_fir,
        .ndo_open = via_ircc_net_open,
        .ndo_stop = via_ircc_net_close,
        .ndo_do_ioctl = via_ircc_net_ioctl,
};

/*
 * Function via_ircc_open(pdev, iobase, irq)
 *
 *    Open driver instance
 *
 */
static int via_ircc_open(struct pci_dev *pdev, chipio_t *info, unsigned int id)
{
        struct net_device *dev;
        struct via_ircc_cb *self;
        int err;

        IRDA_DEBUG(3, "%s()\n", __func__);

        /* Allocate new instance of the driver */
        dev = alloc_irdadev(sizeof(struct via_ircc_cb));
        if (dev == NULL) 
                return -ENOMEM;

        self = netdev_priv(dev);
        self->netdev = dev;
        spin_lock_init(&self->lock);

        pci_set_drvdata(pdev, self);

        /* Initialize Resource */
        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.dma2 = info->dma2;
        self->io.fifo_size = 32;
        self->chip_id = id;
        self->st_fifo.len = 0;
        self->RxDataReady = 0;

        /* Reserve the ioports that we need */
        if (!request_region(self->io.fir_base, self->io.fir_ext, driver_name)) {
                IRDA_DEBUG(0, "%s(), can't get iobase of 0x%03x\n",
                           __func__, self->io.fir_base);
                err = -ENODEV;
                goto err_out1;
        }
        
        /* Initialize QoS for this device */
        irda_init_max_qos_capabilies(&self->qos);

        /* Check if user has supplied the dongle id or not */
        if (!dongle_id)
                dongle_id = via_ircc_read_dongle_id(self->io.fir_base);
        self->io.dongle_id = dongle_id;

        /* The only value we must override it the baudrate */
        /* Maximum speeds and capabilities are dongle-dependent. */
        switch( self->io.dongle_id ){
        case 0x0d:
                self->qos.baud_rate.bits =
                    IR_9600 | IR_19200 | IR_38400 | IR_57600 | IR_115200 |
                    IR_576000 | IR_1152000 | (IR_4000000 << 8);
                break;
        default:
                self->qos.baud_rate.bits =
                    IR_9600 | IR_19200 | IR_38400 | IR_57600 | IR_115200;
                break;
        }

        /* Following was used for testing:
         *
         *   self->qos.baud_rate.bits = IR_9600;
         *
         * Is is no good, as it prohibits (error-prone) speed-changes.
         */

        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 + 2048;
        self->tx_buff.truesize = 14384 + 2048;

        /* Allocate memory if needed */
        self->rx_buff.head =
                dma_alloc_coherent(&pdev->dev, self->rx_buff.truesize,
                                   &self->rx_buff_dma, GFP_KERNEL | __GFP_ZERO);
        if (self->rx_buff.head == NULL) {
                err = -ENOMEM;
                goto err_out2;
        }

        self->tx_buff.head =
                dma_alloc_coherent(&pdev->dev, self->tx_buff.truesize,
                                   &self->tx_buff_dma, GFP_KERNEL | __GFP_ZERO);
        if (self->tx_buff.head == NULL) {
                err = -ENOMEM;
                goto err_out3;
        }

        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 = &via_ircc_sir_ops;

        err = register_netdev(dev);
        if (err)
                goto err_out4;

        IRDA_MESSAGE("IrDA: Registered device %s (via-ircc)\n", dev->name);

        /* Initialise the hardware..
        */
        self->io.speed = 9600;
        via_hw_init(self);
        return 0;
 err_out4:
        dma_free_coherent(&pdev->dev, self->tx_buff.truesize,
                          self->tx_buff.head, self->tx_buff_dma);
 err_out3:
        dma_free_coherent(&pdev->dev, self->rx_buff.truesize,
                          self->rx_buff.head, self->rx_buff_dma);
 err_out2:
        release_region(self->io.fir_base, self->io.fir_ext);
 err_out1:
        pci_set_drvdata(pdev, NULL);
        free_netdev(dev);
        return err;
}

/*
 * Function via_remove_one(pdev)
 *
 *    Close driver instance
 *
 */
static void via_remove_one(struct pci_dev *pdev)
{
        struct via_ircc_cb *self = pci_get_drvdata(pdev);
        int iobase;

        IRDA_DEBUG(3, "%s()\n", __func__);

        iobase = self->io.fir_base;

        ResetChip(iobase, 5);   //hardware reset.
        /* Remove netdevice */
        unregister_netdev(self->netdev);

        /* Release the PORT that this driver is using */
        IRDA_DEBUG(2, "%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(&pdev->dev, self->tx_buff.truesize,
                                  self->tx_buff.head, self->tx_buff_dma);
        if (self->rx_buff.head)
                dma_free_coherent(&pdev->dev, self->rx_buff.truesize,
                                  self->rx_buff.head, self->rx_buff_dma);
        pci_set_drvdata(pdev, NULL);

        free_netdev(self->netdev);

        pci_disable_device(pdev);
}

/*
 * Function via_hw_init(self)
 *
 *    Returns non-negative on success.
 *
 * Formerly via_ircc_setup 
 */
static void via_hw_init(struct via_ircc_cb *self)
{
        int iobase = self->io.fir_base;

        IRDA_DEBUG(3, "%s()\n", __func__);

        SetMaxRxPacketSize(iobase, 0x0fff);     //set to max:4095
        // FIFO Init
        EnRXFIFOReadyInt(iobase, OFF);
        EnRXFIFOHalfLevelInt(iobase, OFF);
        EnTXFIFOHalfLevelInt(iobase, OFF);
        EnTXFIFOUnderrunEOMInt(iobase, ON);
        EnTXFIFOReadyInt(iobase, OFF);
        InvertTX(iobase, OFF);
        InvertRX(iobase, OFF);

        if (ReadLPCReg(0x20) == 0x3c)
                WriteLPCReg(0xF0, 0);   // for VT1211
        /* Int Init */
        EnRXSpecInt(iobase, ON);

        /* The following is basically hwreset */
        /* If this is the case, why not just call hwreset() ? Jean II */
        ResetChip(iobase, 5);
        EnableDMA(iobase, OFF);
        EnableTX(iobase, OFF);
        EnableRX(iobase, OFF);
        EnRXDMA(iobase, OFF);
        EnTXDMA(iobase, OFF);
        RXStart(iobase, OFF);
        TXStart(iobase, OFF);
        InitCard(iobase);
        CommonInit(iobase);
        SIRFilter(iobase, ON);
        SetSIR(iobase, ON);
        CRC16(iobase, ON);
        EnTXCRC(iobase, 0);
        WriteReg(iobase, I_ST_CT_0, 0x00);
        SetBaudRate(iobase, 9600);
        SetPulseWidth(iobase, 12);
        SetSendPreambleCount(iobase, 0);

        self->io.speed = 9600;
        self->st_fifo.len = 0;

        via_ircc_change_dongle_speed(iobase, self->io.speed,
                                     self->io.dongle_id);

        WriteReg(iobase, I_ST_CT_0, 0x80);
}

/*
 * Function via_ircc_read_dongle_id (void)
 *
 */
static int via_ircc_read_dongle_id(int iobase)
{
        int dongle_id = 9;      /* Default to IBM */

        IRDA_ERROR("via-ircc: dongle probing not supported, please specify dongle_id module parameter.\n");
        return dongle_id;
}

/*
 * Function via_ircc_change_dongle_speed (iobase, speed, dongle_id)
 *    Change speed of the attach dongle
 *    only implement two type of dongle currently.
 */
static void via_ircc_change_dongle_speed(int iobase, int speed,
                                         int dongle_id)
{
        u8 mode = 0;

        /* speed is unused, as we use IsSIROn()/IsMIROn() */
        speed = speed;

        IRDA_DEBUG(1, "%s(): change_dongle_speed to %d for 0x%x, %d\n",
                   __func__, speed, iobase, dongle_id);

        switch (dongle_id) {

                /* Note: The dongle_id's listed here are derived from
                 * nsc-ircc.c */ 

        case 0x08:              /* HP HSDL-2300, HP HSDL-3600/HSDL-3610 */
                UseOneRX(iobase, ON);   // use one RX pin   RX1,RX2
                InvertTX(iobase, OFF);
                InvertRX(iobase, OFF);

                EnRX2(iobase, ON);      //sir to rx2
                EnGPIOtoRX2(iobase, OFF);

                if (IsSIROn(iobase)) {  //sir
                        // Mode select Off
                        SlowIRRXLowActive(iobase, ON);
                        udelay(1000);
                        SlowIRRXLowActive(iobase, OFF);
                } else {
                        if (IsMIROn(iobase)) {  //mir
                                // Mode select On
                                SlowIRRXLowActive(iobase, OFF);
                                udelay(20);
                        } else {        // fir
                                if (IsFIROn(iobase)) {  //fir
                                        // Mode select On
                                        SlowIRRXLowActive(iobase, OFF);
                                        udelay(20);
                                }
                        }
                }
                break;

        case 0x09:              /* IBM31T1100 or Temic TFDS6000/TFDS6500 */
                UseOneRX(iobase, ON);   //use ONE RX....RX1
                InvertTX(iobase, OFF);
                InvertRX(iobase, OFF);  // invert RX pin

                EnRX2(iobase, ON);
                EnGPIOtoRX2(iobase, OFF);
                if (IsSIROn(iobase)) {  //sir
                        // Mode select On
                        SlowIRRXLowActive(iobase, ON);
                        udelay(20);
                        // Mode select Off
                        SlowIRRXLowActive(iobase, OFF);
                }
                if (IsMIROn(iobase)) {  //mir
                        // Mode select On
                        SlowIRRXLowActive(iobase, OFF);
                        udelay(20);
                        // Mode select Off
                        SlowIRRXLowActive(iobase, ON);
                } else {        // fir
                        if (IsFIROn(iobase)) {  //fir
                                // Mode select On
                                SlowIRRXLowActive(iobase, OFF);
                                // TX On
                                WriteTX(iobase, ON);
                                udelay(20);
                                // Mode select OFF
                                SlowIRRXLowActive(iobase, ON);
                                udelay(20);
                                // TX Off
                                WriteTX(iobase, OFF);
                        }
                }
                break;

        case 0x0d:
                UseOneRX(iobase, OFF);  // use two RX pin   RX1,RX2
                InvertTX(iobase, OFF);
                InvertRX(iobase, OFF);
                SlowIRRXLowActive(iobase, OFF);
                if (IsSIROn(iobase)) {  //sir
                        EnGPIOtoRX2(iobase, OFF);
                        WriteGIO(iobase, OFF);
                        EnRX2(iobase, OFF);     //sir to rx2
                } else {        // fir mir
                        EnGPIOtoRX2(iobase, OFF);
                        WriteGIO(iobase, OFF);
                        EnRX2(iobase, OFF);     //fir to rx
                }
                break;

        case 0x11:              /* Temic TFDS4500 */

                IRDA_DEBUG(2, "%s: Temic TFDS4500: One RX pin, TX normal, RX inverted.\n", __func__);

                UseOneRX(iobase, ON);   //use ONE RX....RX1
                InvertTX(iobase, OFF);
                InvertRX(iobase, ON);   // invert RX pin
        
                EnRX2(iobase, ON);      //sir to rx2
                EnGPIOtoRX2(iobase, OFF);

                if( IsSIROn(iobase) ){  //sir

                        // Mode select On
                        SlowIRRXLowActive(iobase, ON);
                        udelay(20);
                        // Mode select Off
                        SlowIRRXLowActive(iobase, OFF);

                } else{
                        IRDA_DEBUG(0, "%s: Warning: TFDS4500 not running in SIR mode !\n", __func__);
                }
                break;

        case 0x0ff:             /* Vishay */
                if (IsSIROn(iobase))
                        mode = 0;
                else if (IsMIROn(iobase))
                        mode = 1;
                else if (IsFIROn(iobase))
                        mode = 2;
                else if (IsVFIROn(iobase))
                        mode = 5;       //VFIR-16
                SI_SetMode(iobase, mode);
                break;

        default:
                IRDA_ERROR("%s: Error: dongle_id %d unsupported !\n",
                           __func__, dongle_id);
        }
}

/*
 * Function via_ircc_change_speed (self, baud)
 *
 *    Change the speed of the device
 *
 */
static void via_ircc_change_speed(struct via_ircc_cb *self, __u32 speed)
{
        struct net_device *dev = self->netdev;
        u16 iobase;
        u8 value = 0, bTmp;

        iobase = self->io.fir_base;
        /* Update accounting for new speed */
        self->io.speed = speed;
        IRDA_DEBUG(1, "%s: change_speed to %d bps.\n", __func__, speed);

        WriteReg(iobase, I_ST_CT_0, 0x0);

        /* Controller mode sellection */
        switch (speed) {
        case 2400:
        case 9600:
        case 19200:
        case 38400:
        case 57600:
        case 115200:
                value = (115200/speed)-1;
                SetSIR(iobase, ON);
                CRC16(iobase, ON);
                break;
        case 576000:
                /* FIXME: this can't be right, as it's the same as 115200,
                 * and 576000 is MIR, not SIR. */
                value = 0;
                SetSIR(iobase, ON);
                CRC16(iobase, ON);
                break;
        case 1152000:
                value = 0;
                SetMIR(iobase, ON);
                /* FIXME: CRC ??? */
                break;
        case 4000000:
                value = 0;
                SetFIR(iobase, ON);
                SetPulseWidth(iobase, 0);
                SetSendPreambleCount(iobase, 14);
                CRC16(iobase, OFF);
                EnTXCRC(iobase, ON);
                break;
        case 16000000:
                value = 0;
                SetVFIR(iobase, ON);
                /* FIXME: CRC ??? */
                break;
        default:
                value = 0;
                break;
        }

        /* Set baudrate to 0x19[2..7] */
        bTmp = (ReadReg(iobase, I_CF_H_1) & 0x03);
        bTmp |= value << 2;
        WriteReg(iobase, I_CF_H_1, bTmp);

        /* Some dongles may need to be informed about speed changes. */
        via_ircc_change_dongle_speed(iobase, speed, self->io.dongle_id);

        /* Set FIFO size to 64 */
        SetFIFO(iobase, 64);

        /* Enable IR */
        WriteReg(iobase, I_ST_CT_0, 0x80);

        // EnTXFIFOHalfLevelInt(iobase,ON);

        /* Enable some interrupts so we can receive frames */
        //EnAllInt(iobase,ON);

        if (IsSIROn(iobase)) {
                SIRFilter(iobase, ON);
                SIRRecvAny(iobase, ON);
        } else {
                SIRFilter(iobase, OFF);
                SIRRecvAny(iobase, OFF);
        }

        if (speed > 115200) {
                /* Install FIR xmit handler */
                dev->netdev_ops = &via_ircc_fir_ops;
                via_ircc_dma_receive(self);
        } else {
                /* Install SIR xmit handler */
                dev->netdev_ops = &via_ircc_sir_ops;
        }
        netif_wake_queue(dev);
}

/*
 * Function via_ircc_hard_xmit (skb, dev)
 *
 *    Transmit the frame!
 *
 */
static netdev_tx_t via_ircc_hard_xmit_sir(struct sk_buff *skb,
                                                struct net_device *dev)
{
        struct via_ircc_cb *self;
        unsigned long flags;
        u16 iobase;
        __u32 speed;

        self = netdev_priv(dev);
        IRDA_ASSERT(self != NULL, return NETDEV_TX_OK;);
        iobase = self->io.fir_base;

        netif_stop_queue(dev);
        /* 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) {
                        via_ircc_change_speed(self, speed);
                        dev->trans_start = jiffies;
                        dev_kfree_skb(skb);
                        return NETDEV_TX_OK;
                } else
                        self->new_speed = speed;
        }
        InitCard(iobase);
        CommonInit(iobase);
        SIRFilter(iobase, ON);
        SetSIR(iobase, ON);
        CRC16(iobase, ON);
        EnTXCRC(iobase, 0);
        WriteReg(iobase, I_ST_CT_0, 0x00);

        spin_lock_irqsave(&self->lock, flags);
        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;
        /* Send this frame with old speed */
        SetBaudRate(iobase, self->io.speed);
        SetPulseWidth(iobase, 12);
        SetSendPreambleCount(iobase, 0);
        WriteReg(iobase, I_ST_CT_0, 0x80);

        EnableTX(iobase, ON);
        EnableRX(iobase, OFF);

        ResetChip(iobase, 0);
        ResetChip(iobase, 1);
        ResetChip(iobase, 2);
        ResetChip(iobase, 3);
        ResetChip(iobase, 4);

        EnAllInt(iobase, ON);
        EnTXDMA(iobase, ON);
        EnRXDMA(iobase, OFF);

        irda_setup_dma(self->io.dma, self->tx_buff_dma, self->tx_buff.len,
                       DMA_TX_MODE);

        SetSendByte(iobase, self->tx_buff.len);
        RXStart(iobase, OFF);
        TXStart(iobase, ON);

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

static netdev_tx_t via_ircc_hard_xmit_fir(struct sk_buff *skb,
                                                struct net_device *dev)
{
        struct via_ircc_cb *self;
        u16 iobase;
        __u32 speed;
        unsigned long flags;

        self = netdev_priv(dev);
        iobase = self->io.fir_base;

        if (self->st_fifo.len)
                return NETDEV_TX_OK;
        if (self->chip_id == 0x3076)
                iodelay(1500);
        else
                udelay(1500);
        netif_stop_queue(dev);
        speed = irda_get_next_speed(skb);
        if ((speed != self->io.speed) && (speed != -1)) {
                if (!skb->len) {
                        via_ircc_change_speed(self, speed);
                        dev->trans_start = jiffies;
                        dev_kfree_skb(skb);
                        return NETDEV_TX_OK;
                } else
                        self->new_speed = speed;
        }
        spin_lock_irqsave(&self->lock, flags);
        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++;
//F01   if (self->tx_fifo.len == 1) {
        via_ircc_dma_xmit(self, iobase);
//F01   }
//F01   if (self->tx_fifo.free < (MAX_TX_WINDOW -1 )) netif_wake_queue(self->netdev);
        dev->trans_start = jiffies;
        dev_kfree_skb(skb);
        spin_unlock_irqrestore(&self->lock, flags);
        return NETDEV_TX_OK;

}

static int via_ircc_dma_xmit(struct via_ircc_cb *self, u16 iobase)
{
        EnTXDMA(iobase, OFF);
        self->io.direction = IO_XMIT;
        EnPhys(iobase, ON);
        EnableTX(iobase, ON);
        EnableRX(iobase, OFF);
        ResetChip(iobase, 0);
        ResetChip(iobase, 1);
        ResetChip(iobase, 2);
        ResetChip(iobase, 3);
        ResetChip(iobase, 4);
        EnAllInt(iobase, ON);
        EnTXDMA(iobase, ON);
        EnRXDMA(iobase, OFF);
        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);
        IRDA_DEBUG(1, "%s: tx_fifo.ptr=%x,len=%x,tx_fifo.len=%x..\n",
                   __func__, self->tx_fifo.ptr,
                   self->tx_fifo.queue[self->tx_fifo.ptr].len,
                   self->tx_fifo.len);

        SetSendByte(iobase, self->tx_fifo.queue[self->tx_fifo.ptr].len);
        RXStart(iobase, OFF);
        TXStart(iobase, ON);
        return 0;

}

/*
 * Function via_ircc_dma_xmit_complete (self)
 *
 *    The transfer of a frame in finished. This function will only be called 
 *    by the interrupt handler
 *
 */
static int via_ircc_dma_xmit_complete(struct via_ircc_cb *self)
{
        int iobase;
        int ret = TRUE;
        u8 Tx_status;

        IRDA_DEBUG(3, "%s()\n", __func__);

        iobase = self->io.fir_base;
        /* Disable DMA */
//      DisableDmaChannel(self->io.dma);
        /* Check for underrun! */
        /* Clear bit, by writing 1 into it */
        Tx_status = GetTXStatus(iobase);
        if (Tx_status & 0x08) {
                self->netdev->stats.tx_errors++;
                self->netdev->stats.tx_fifo_errors++;
                hwreset(self);
        /* how to clear underrun? */
        } else {
                self->netdev->stats.tx_packets++;
                ResetChip(iobase, 3);
                ResetChip(iobase, 4);
        }
        /* Check if we need to change the speed */
        if (self->new_speed) {
                via_ircc_change_speed(self, self->new_speed);
                self->new_speed = 0;
        }

        /* Finished with this frame, so prepare for next */
        if (IsFIROn(iobase)) {
                if (self->tx_fifo.len) {
                        self->tx_fifo.len--;
                        self->tx_fifo.ptr++;
                }
        }
        IRDA_DEBUG(1,
                   "%s: tx_fifo.len=%x ,tx_fifo.ptr=%x,tx_fifo.free=%x...\n",
                   __func__,
                   self->tx_fifo.len, self->tx_fifo.ptr, self->tx_fifo.free);
/* F01_S
        // Any frames to be sent back-to-back? 
        if (self->tx_fifo.len) {
                // Not finished yet! 
                via_ircc_dma_xmit(self, iobase);
                ret = FALSE;
        } else { 
F01_E*/
        // 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;
//F01   }

        // Make sure we have room for more frames 
//F01   if (self->tx_fifo.free < (MAX_TX_WINDOW -1 )) {
        // Not busy transmitting anymore 
        // Tell the network layer, that we can accept more frames 
        netif_wake_queue(self->netdev);
//F01   }
        return ret;
}

/*
 * Function via_ircc_dma_receive (self)
 *
 *    Set configuration for receive a frame.
 *
 */
static int via_ircc_dma_receive(struct via_ircc_cb *self)

{
        int iobase;

        iobase = self->io.fir_base;

        IRDA_DEBUG(3, "%s()\n", __func__);

        self->tx_fifo.len = self->tx_fifo.ptr = self->tx_fifo.free = 0;
        self->tx_fifo.tail = self->tx_buff.head;
        self->RxDataReady = 0;
        self->io.direction = IO_RECV;
        self->rx_buff.data = self->rx_buff.head;
        self->st_fifo.len = self->st_fifo.pending_bytes = 0;
        self->st_fifo.tail = self->st_fifo.head = 0;

        EnPhys(iobase, ON);
        EnableTX(iobase, OFF);
        EnableRX(iobase, ON);

        ResetChip(iobase, 0);
        ResetChip(iobase, 1);
        ResetChip(iobase, 2);
        ResetChip(iobase, 3);
        ResetChip(iobase, 4);

        EnAllInt(iobase, ON);
        EnTXDMA(iobase, OFF);
        EnRXDMA(iobase, ON);
        irda_setup_dma(self->io.dma2, self->rx_buff_dma,
                  self->rx_buff.truesize, DMA_RX_MODE);
        TXStart(iobase, OFF);
        RXStart(iobase, ON);

        return 0;
}

/*
 * Function via_ircc_dma_receive_complete (self)
 *
 *    Controller Finished with receiving frames,
 *    and this routine is call by ISR
 *    
 */
static int via_ircc_dma_receive_complete(struct via_ircc_cb *self,
                                         int iobase)
{
        struct st_fifo *st_fifo;
        struct sk_buff *skb;
        int len, i;
        u8 status = 0;

        iobase = self->io.fir_base;
        st_fifo = &self->st_fifo;

        if (self->io.speed < 4000000) { //Speed below FIR
                len = GetRecvByte(iobase, self);
                skb = dev_alloc_skb(len + 1);
                if (skb == NULL)
                        return FALSE;
                // Make sure IP header gets aligned 
                skb_reserve(skb, 1);
                skb_put(skb, len - 2);
                if (self->chip_id == 0x3076) {
                        for (i = 0; i < len - 2; i++)
                                skb->data[i] = self->rx_buff.data[i * 2];
                } else {
                        if (self->chip_id == 0x3096) {
                                for (i = 0; i < len - 2; i++)
                                        skb->data[i] =
                                            self->rx_buff.data[i];
                        }
                }
                // 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);
                return TRUE;
        }

        else {                  //FIR mode
                len = GetRecvByte(iobase, self);
                if (len == 0)
                        return TRUE;    //interrupt only, data maybe move by RxT  
                if (((len - 4) < 2) || ((len - 4) > 2048)) {
                        IRDA_DEBUG(1, "%s(): Trouble:len=%x,CurCount=%x,LastCount=%x..\n",
                                   __func__, len, RxCurCount(iobase, self),
                                   self->RxLastCount);
                        hwreset(self);
                        return FALSE;
                }
                IRDA_DEBUG(2, "%s(): fifo.len=%x,len=%x,CurCount=%x..\n",
                           __func__,
                           st_fifo->len, len - 4, RxCurCount(iobase, self));

                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++;
                if (st_fifo->tail > MAX_RX_WINDOW)
                        st_fifo->tail = 0;
                self->RxDataReady = 0;

                // It maybe have MAX_RX_WINDOW package receive by
                // receive_complete before Timer IRQ
/* F01_S
          if (st_fifo->len < (MAX_RX_WINDOW+2 )) { 
                  RXStart(iobase,ON);
                  SetTimer(iobase,4);
          }
          else    { 
F01_E */
                EnableRX(iobase, OFF);
                EnRXDMA(iobase, OFF);
                RXStart(iobase, OFF);
//F01_S
                // Put this entry back in fifo 
                if (st_fifo->head > MAX_RX_WINDOW)
                        st_fifo->head = 0;
                status = st_fifo->entries[st_fifo->head].status;
                len = st_fifo->entries[st_fifo->head].len;
                st_fifo->head++;
                st_fifo->len--;

                skb = dev_alloc_skb(len + 1 - 4);
                /*
                 * if frame size, data ptr, or skb ptr are wrong, then get next
                 * entry.
                 */
                if ((skb == NULL) || (skb->data == NULL) ||
                    (self->rx_buff.data == NULL) || (len < 6)) {
                        self->netdev->stats.rx_dropped++;
                        kfree_skb(skb);
                        return TRUE;
                }
                skb_reserve(skb, 1);
                skb_put(skb, len - 4);

                skb_copy_to_linear_data(skb, self->rx_buff.data, len - 4);
                IRDA_DEBUG(2, "%s(): len=%x.rx_buff=%p\n", __func__,
                           len - 4, self->rx_buff.data);

                // 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);

//F01_E
        }                       //FIR
        return TRUE;

}

/*
 * if frame is received , but no INT ,then use this routine to upload frame.
 */
static int upload_rxdata(struct via_ircc_cb *self, int iobase)
{
        struct sk_buff *skb;
        int len;
        struct st_fifo *st_fifo;
        st_fifo = &self->st_fifo;

        len = GetRecvByte(iobase, self);

        IRDA_DEBUG(2, "%s(): len=%x\n", __func__, len);

        if ((len - 4) < 2) {
                self->netdev->stats.rx_dropped++;
                return FALSE;
        }

        skb = dev_alloc_skb(len + 1);
        if (skb == NULL) {
                self->netdev->stats.rx_dropped++;
                return FALSE;
        }
        skb_reserve(skb, 1);
        skb_put(skb, len - 4 + 1);
        skb_copy_to_linear_data(skb, self->rx_buff.data, len - 4 + 1);
        st_fifo->tail++;
        st_fifo->len++;
        if (st_fifo->tail > MAX_RX_WINDOW)
                st_fifo->tail = 0;
        // 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);
        if (st_fifo->len < (MAX_RX_WINDOW + 2)) {
                RXStart(iobase, ON);
        } else {
                EnableRX(iobase, OFF);
                EnRXDMA(iobase, OFF);
                RXStart(iobase, OFF);
        }
        return TRUE;
}

/*
 * Implement back to back receive , use this routine to upload data.
 */

static int RxTimerHandler(struct via_ircc_cb *self, int iobase)
{
        struct st_fifo *st_fifo;
        struct sk_buff *skb;
        int len;
        u8 status;

        st_fifo = &self->st_fifo;

        if (CkRxRecv(iobase, self)) {
                // if still receiving ,then return ,don't upload frame 
                self->RetryCount = 0;
                SetTimer(iobase, 20);
                self->RxDataReady++;
                return FALSE;
        } else
                self->RetryCount++;

        if ((self->RetryCount >= 1) ||
            ((st_fifo->pending_bytes + 2048) > self->rx_buff.truesize) ||
            (st_fifo->len >= (MAX_RX_WINDOW))) {
                while (st_fifo->len > 0) {      //upload frame
                        // Put this entry back in fifo 
                        if (st_fifo->head > MAX_RX_WINDOW)
                                st_fifo->head = 0;
                        status = st_fifo->entries[st_fifo->head].status;
                        len = st_fifo->entries[st_fifo->head].len;
                        st_fifo->head++;
                        st_fifo->len--;

                        skb = dev_alloc_skb(len + 1 - 4);
                        /*
                         * if frame size, data ptr, or skb ptr are wrong,
                         * then get next entry.
                         */
                        if ((skb == NULL) || (skb->data == NULL) ||
                            (self->rx_buff.data == NULL) || (len < 6)) {
                                self->netdev->stats.rx_dropped++;
                                continue;
                        }
                        skb_reserve(skb, 1);
                        skb_put(skb, len - 4);
                        skb_copy_to_linear_data(skb, self->rx_buff.data, len - 4);

                        IRDA_DEBUG(2, "%s(): len=%x.head=%x\n", __func__,
                                   len - 4, st_fifo->head);

                        // 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);
                }               //while
                self->RetryCount = 0;

                IRDA_DEBUG(2,
                           "%s(): End of upload HostStatus=%x,RxStatus=%x\n",
                           __func__,
                           GetHostStatus(iobase), GetRXStatus(iobase));

                /*
                 * if frame is receive complete at this routine ,then upload
                 * frame.
                 */
                if ((GetRXStatus(iobase) & 0x10) &&
                    (RxCurCount(iobase, self) != self->RxLastCount)) {
                        upload_rxdata(self, iobase);
                        if (irda_device_txqueue_empty(self->netdev))
                                via_ircc_dma_receive(self);
                }
        }                       // timer detect complete
        else
                SetTimer(iobase, 4);
        return TRUE;

}



/*
 * Function via_ircc_interrupt (irq, dev_id)
 *
 *    An interrupt from the chip has arrived. Time to do some work
 *
 */
static irqreturn_t via_ircc_interrupt(int dummy, void *dev_id)
{
        struct net_device *dev = dev_id;
        struct via_ircc_cb *self = netdev_priv(dev);
        int iobase;
        u8 iHostIntType, iRxIntType, iTxIntType;

        iobase = self->io.fir_base;
        spin_lock(&self->lock);
        iHostIntType = GetHostStatus(iobase);

        IRDA_DEBUG(4, "%s(): iHostIntType %02x:  %s %s %s  %02x\n",
                   __func__, iHostIntType,
                   (iHostIntType & 0x40) ? "Timer" : "",
                   (iHostIntType & 0x20) ? "Tx" : "",
                   (iHostIntType & 0x10) ? "Rx" : "",
                   (iHostIntType & 0x0e) >> 1);

        if ((iHostIntType & 0x40) != 0) {       //Timer Event
                self->EventFlag.TimeOut++;
                ClearTimerInt(iobase, 1);
                if (self->io.direction == IO_XMIT) {
                        via_ircc_dma_xmit(self, iobase);
                }
                if (self->io.direction == IO_RECV) {
                        /*
                         * frame ready hold too long, must reset.
                         */
                        if (self->RxDataReady > 30) {
                                hwreset(self);
                                if (irda_device_txqueue_empty(self->netdev)) {
                                        via_ircc_dma_receive(self);
                                }
                        } else {        // call this to upload frame.
                                RxTimerHandler(self, iobase);
                        }
                }               //RECV
        }                       //Timer Event
        if ((iHostIntType & 0x20) != 0) {       //Tx Event
                iTxIntType = GetTXStatus(iobase);

                IRDA_DEBUG(4, "%s(): iTxIntType %02x:  %s %s %s %s\n",
                           __func__, iTxIntType,
                           (iTxIntType & 0x08) ? "FIFO underr." : "",
                           (iTxIntType & 0x04) ? "EOM" : "",
                           (iTxIntType & 0x02) ? "FIFO ready" : "",
                           (iTxIntType & 0x01) ? "Early EOM" : "");

                if (iTxIntType & 0x4) {
                        self->EventFlag.EOMessage++;    // read and will auto clean
                        if (via_ircc_dma_xmit_complete(self)) {
                                if (irda_device_txqueue_empty
                                    (self->netdev)) {
                                        via_ircc_dma_receive(self);
                                }
                        } else {
                                self->EventFlag.Unknown++;
                        }
                }               //EOP
        }                       //Tx Event
        //----------------------------------------
        if ((iHostIntType & 0x10) != 0) {       //Rx Event
                /* Check if DMA has finished */
                iRxIntType = GetRXStatus(iobase);

                IRDA_DEBUG(4, "%s(): iRxIntType %02x:  %s %s %s %s %s %s %s\n",
                           __func__, iRxIntType,
                           (iRxIntType & 0x80) ? "PHY err."     : "",
                           (iRxIntType & 0x40) ? "CRC err"      : "",
                           (iRxIntType & 0x20) ? "FIFO overr."  : "",
                           (iRxIntType & 0x10) ? "EOF"          : "",
                           (iRxIntType & 0x08) ? "RxData"       : "",
                           (iRxIntType & 0x02) ? "RxMaxLen"     : "",
                           (iRxIntType & 0x01) ? "SIR bad"      : "");
                if (!iRxIntType)
                        IRDA_DEBUG(3, "%s(): RxIRQ =0\n", __func__);

                if (iRxIntType & 0x10) {
                        if (via_ircc_dma_receive_complete(self, iobase)) {
//F01       if(!(IsFIROn(iobase)))  via_ircc_dma_receive(self);
                                via_ircc_dma_receive(self);
                        }
                }               // No ERR     
                else {          //ERR
                        IRDA_DEBUG(4, "%s(): RxIRQ ERR:iRxIntType=%x,HostIntType=%x,CurCount=%x,RxLastCount=%x_____\n",
                                   __func__, iRxIntType, iHostIntType,
                                   RxCurCount(iobase, self),
                                   self->RxLastCount);

                        if (iRxIntType & 0x20) {        //FIFO OverRun ERR
                                ResetChip(iobase, 0);
                                ResetChip(iobase, 1);
                        } else {        //PHY,CRC ERR

                                if (iRxIntType != 0x08)
                                        hwreset(self);  //F01
                        }
                        via_ircc_dma_receive(self);
                }               //ERR

        }                       //Rx Event
        spin_unlock(&self->lock);
        return IRQ_RETVAL(iHostIntType);
}

static void hwreset(struct via_ircc_cb *self)
{
        int iobase;
        iobase = self->io.fir_base;

        IRDA_DEBUG(3, "%s()\n", __func__);

        ResetChip(iobase, 5);
        EnableDMA(iobase, OFF);
        EnableTX(iobase, OFF);
        EnableRX(iobase, OFF);
        EnRXDMA(iobase, OFF);
        EnTXDMA(iobase, OFF);
        RXStart(iobase, OFF);
        TXStart(iobase, OFF);
        InitCard(iobase);
        CommonInit(iobase);
        SIRFilter(iobase, ON);
        SetSIR(iobase, ON);
        CRC16(iobase, ON);
        EnTXCRC(iobase, 0);
        WriteReg(iobase, I_ST_CT_0, 0x00);
        SetBaudRate(iobase, 9600);
        SetPulseWidth(iobase, 12);
        SetSendPreambleCount(iobase, 0);
        WriteReg(iobase, I_ST_CT_0, 0x80);

        /* Restore speed. */
        via_ircc_change_speed(self, self->io.speed);

        self->st_fifo.len = 0;
}

/*
 * Function via_ircc_is_receiving (self)
 *
 *    Return TRUE is we are currently receiving a frame
 *
 */
static int via_ircc_is_receiving(struct via_ircc_cb *self)
{
        int status = FALSE;
        int iobase;

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

        iobase = self->io.fir_base;
        if (CkRxRecv(iobase, self))
                status = TRUE;

        IRDA_DEBUG(2, "%s(): status=%x....\n", __func__, status);

        return status;
}


/*
 * Function via_ircc_net_open (dev)
 *
 *    Start the device
 *
 */
static int via_ircc_net_open(struct net_device *dev)
{
        struct via_ircc_cb *self;
        int iobase;
        char hwname[32];

        IRDA_DEBUG(3, "%s()\n", __func__);

        IRDA_ASSERT(dev != NULL, return -1;);
        self = netdev_priv(dev);
        dev->stats.rx_packets = 0;
        IRDA_ASSERT(self != NULL, return 0;);
        iobase = self->io.fir_base;
        if (request_irq(self->io.irq, via_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;
        }
        if (self->io.dma2 != self->io.dma) {
                if (request_dma(self->io.dma2, dev->name)) {
                        IRDA_WARNING("%s, unable to allocate dma2=%d\n",
                                     driver_name, self->io.dma2);
                        free_irq(self->io.irq, dev);
                        free_dma(self->io.dma);
                        return -EAGAIN;
                }
        }


        /* turn on interrupts */
        EnAllInt(iobase, ON);
        EnInternalLoop(iobase, OFF);
        EnExternalLoop(iobase, OFF);

        /* */
        via_ircc_dma_receive(self);

        /* Ready to play! */
        netif_start_queue(dev);

        /* 
         * Open new IrLAP layer instance, now that everything should be
         * initialized properly 
         */
        sprintf(hwname, "VIA @ 0x%x", iobase);
        self->irlap = irlap_open(dev, &self->qos, hwname);

        self->RxLastCount = 0;

        return 0;
}

/*
 * Function via_ircc_net_close (dev)
 *
 *    Stop the device
 *
 */
static int via_ircc_net_close(struct net_device *dev)
{
        struct via_ircc_cb *self;
        int iobase;

        IRDA_DEBUG(3, "%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;
        EnTXDMA(iobase, OFF);
        EnRXDMA(iobase, OFF);
        DisableDmaChannel(self->io.dma);

        /* Disable interrupts */
        EnAllInt(iobase, OFF);
        free_irq(self->io.irq, dev);
        free_dma(self->io.dma);
        if (self->io.dma2 != self->io.dma)
                free_dma(self->io.dma2);

        return 0;
}

/*
 * Function via_ircc_net_ioctl (dev, rq, cmd)
 *
 *    Process IOCTL commands for this device
 *
 */
static int via_ircc_net_ioctl(struct net_device *dev, struct ifreq *rq,
                              int cmd)
{
        struct if_irda_req *irq = (struct if_irda_req *) rq;
        struct via_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(1, "%s(), %s, (cmd=0x%X)\n", __func__, dev->name,
                   cmd);
        /* Disable interrupts & save flags */
        spin_lock_irqsave(&self->lock, flags);
        switch (cmd) {
        case SIOCSBANDWIDTH:    /* Set bandwidth */
                if (!capable(CAP_NET_ADMIN)) {
                        ret = -EPERM;
                        goto out;
                }
                via_ircc_change_speed(self, irq->ifr_baudrate);
                break;
        case SIOCSMEDIABUSY:    /* Set media busy */
                if (!capable(CAP_NET_ADMIN)) {
                        ret = -EPERM;
                        goto out;
                }
                irda_device_set_media_busy(self->netdev, TRUE);
                break;
        case SIOCGRECEIVING:    /* Check if we are receiving right now */
                irq->ifr_receiving = via_ircc_is_receiving(self);
                break;
        default:
                ret = -EOPNOTSUPP;
        }
      out:
        spin_unlock_irqrestore(&self->lock, flags);
        return ret;
}

MODULE_AUTHOR("VIA Technologies,inc");
MODULE_DESCRIPTION("VIA IrDA Device Driver");
MODULE_LICENSE("GPL");

module_init(via_ircc_init);
module_exit(via_ircc_cleanup);