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via-ircc.c

/********************************************************************
 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-dependant 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/slab.h>
#include <linux/init.h>
#include <linux/rtnetlink.h>
#include <linux/pci.h>
#include <linux/dma-mapping.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);

/* FIXME : we should not need this, because instances should be automatically
 * managed by the PCI layer. Especially that we seem to only be using the
 * first entry. Jean II */
/* Max 4 instances for now */
static struct via_ircc_cb *dev_self[] = { NULL, NULL, NULL, NULL };

/* Some prototypes */
static int via_ircc_open(int i, chipio_t * info, unsigned int id);
static int via_ircc_close(struct via_ircc_cb *self);
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 int via_ircc_hard_xmit_sir(struct sk_buff *skb,
                          struct net_device *dev);
static int 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 struct net_device_stats *via_ircc_net_get_stats(struct net_device
                                           *dev);
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 __devinit via_init_one (struct pci_dev *pcidev, const struct pci_device_id *id);
static void __devexit 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 struct pci_device_id 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           = __devexit_p(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", __FUNCTION__);

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

static int __devinit 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", __FUNCTION__, id->device);

      rc = pci_enable_device (pcidev);
      if (rc) {
            IRDA_DEBUG(0, "%s(): error rc = %d\n", __FUNCTION__, 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", __FUNCTION__);

            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(0, &info,0x3076) == 0)
                        rc=0;
            } else
                  rc = -ENODEV; //IR not turn on       
      } else { //Not VT1211
            IRDA_DEBUG(2, "%s(): Chipset = 3096\n", __FUNCTION__);

            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(0, &info,0x3096) == 0)
                        rc=0;
            } else
                  rc = -ENODEV; //IR not turn on !!!!!
      }//Not VT1211

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

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

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

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

static void __devexit via_remove_one (struct pci_dev *pdev)
{
      IRDA_DEBUG(3, "%s()\n", __FUNCTION__);

      /* FIXME : This is ugly. We should use pci_get_drvdata(pdev);
       * to get our driver instance and call directly via_ircc_close().
       * See vlsi_ir for details...
       * Jean II */
      via_ircc_clean();

      /* FIXME : This should be in via_ircc_close(), because here we may
       * theoritically disable still configured devices :-( - Jean II */
      pci_disable_device(pdev);
}

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

      /* FIXME : This should be redundant, as pci_unregister_driver()
       * should call via_remove_one() on each device.
       * Jean II */
      via_ircc_clean();

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

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

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

      if (i >= ARRAY_SIZE(dev_self))
            return -ENOMEM;

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

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

      /* FIXME : We should store our driver instance in the PCI layer,
       * using pci_set_drvdata(), not in this array.
       * See vlsi_ir for details... - Jean II */
      /* FIXME : 'i' is always 0 (see via_init_one()) :-( - Jean II */
      /* Need to store self somewhere */
      dev_self[i] = self;
      self->index = i;
      /* 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",
                     __FUNCTION__, 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-dependant. */
      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(NULL, self->rx_buff.truesize,
                           &self->rx_buff_dma, GFP_KERNEL);
      if (self->rx_buff.head == NULL) {
            err = -ENOMEM;
            goto err_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 err_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->hard_start_xmit = via_ircc_hard_xmit_sir;
      dev->open = via_ircc_net_open;
      dev->stop = via_ircc_net_close;
      dev->do_ioctl = via_ircc_net_ioctl;
      dev->get_stats = via_ircc_net_get_stats;

      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(NULL, self->tx_buff.truesize,
                    self->tx_buff.head, self->tx_buff_dma);
 err_out3:
      dma_free_coherent(NULL, 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:
      free_netdev(dev);
      dev_self[i] = NULL;
      return err;
}

/*
 * Function via_ircc_close (self)
 *
 *    Close driver instance
 *
 */
static int via_ircc_close(struct via_ircc_cb *self)
{
      int iobase;

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

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

      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",
               __FUNCTION__, 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 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", __FUNCTION__);

      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",
               __FUNCTION__, 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", __FUNCTION__);

            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", __FUNCTION__);
            }
            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",
                     __FUNCTION__, 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", __FUNCTION__, 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->hard_start_xmit = via_ircc_hard_xmit_fir;
            via_ircc_dma_receive(self);
      } else {
            /* Install SIR xmit handler */
            dev->hard_start_xmit = via_ircc_hard_xmit_sir;
      }
      netif_wake_queue(dev);
}

/*
 * Function via_ircc_hard_xmit (skb, dev)
 *
 *    Transmit the frame!
 *
 */
static int 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 = (struct via_ircc_cb *) dev->priv;
      IRDA_ASSERT(self != NULL, return 0;);
      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 0;
            } 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);

      self->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 0;
}

static int 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 = (struct via_ircc_cb *) dev->priv;
      iobase = self->io.fir_base;

      if (self->st_fifo.len)
            return 0;
      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 0;
            } 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;
      self->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 0;

}

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",
               __FUNCTION__, 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", __FUNCTION__);

      iobase = self->io.fir_base;
      /* Disable DMA */
//      DisableDmaChannel(self->io.dma);
      /* Check for underrrun! */
      /* Clear bit, by writing 1 into it */
      Tx_status = GetTXStatus(iobase);
      if (Tx_status & 0x08) {
            self->stats.tx_errors++;
            self->stats.tx_fifo_errors++;
            hwreset(self);
// how to clear underrrun ?
      } else {
            self->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",
               __FUNCTION__,
               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", __FUNCTION__);

      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->stats.rx_bytes += len;
            self->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",
                           __FUNCTION__, len, RxCurCount(iobase, self),
                           self->RxLastCount);
                  hwreset(self);
                  return FALSE;
            }
            IRDA_DEBUG(2, "%s(): fifo.len=%x,len=%x,CurCount=%x..\n",
                     __FUNCTION__,
                     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 ,the get next
             * entry.
             */
            if ((skb == NULL) || (skb->data == NULL)
                || (self->rx_buff.data == NULL) || (len < 6)) {
                  self->stats.rx_dropped++;
                  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", __FUNCTION__,
                     len - 4, self->rx_buff.data);

            // Move to next frame 
            self->rx_buff.data += len;
            self->stats.rx_bytes += len;
            self->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", __FUNCTION__, len);

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

      skb = dev_alloc_skb(len + 1);
      if (skb == NULL) {
            self->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->stats.rx_bytes += len;
      self->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->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", __FUNCTION__,
                           len - 4, st_fifo->head);

                  // Move to next frame 
                  self->rx_buff.data += len;
                  self->stats.rx_bytes += len;
                  self->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",
                     __FUNCTION__,
                     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 irq, void *dev_id)
{
      struct net_device *dev = (struct net_device *) dev_id;
      struct via_ircc_cb *self;
      int iobase;
      u8 iHostIntType, iRxIntType, iTxIntType;

      if (!dev) {
            IRDA_WARNING("%s: irq %d for unknown device.\n", driver_name,
                       irq);
            return IRQ_NONE;
      }
      self = (struct via_ircc_cb *) dev->priv;
      iobase = self->io.fir_base;
      spin_lock(&self->lock);
      iHostIntType = GetHostStatus(iobase);

      IRDA_DEBUG(4, "%s(): iHostIntType %02x:  %s %s %s  %02x\n",
               __FUNCTION__, 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",
                     __FUNCTION__, 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",
                     __FUNCTION__, 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", __FUNCTION__);

            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",
                           __FUNCTION__, 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", __FUNCTION__);

      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", __FUNCTION__, 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", __FUNCTION__);

      IRDA_ASSERT(dev != NULL, return -1;);
      self = (struct via_ircc_cb *) dev->priv;
      self->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, self);
            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, self);
                  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", __FUNCTION__);

      IRDA_ASSERT(dev != NULL, return -1;);
      self = (struct via_ircc_cb *) dev->priv;
      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);

      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 = dev->priv;
      IRDA_ASSERT(self != NULL, return -1;);
      IRDA_DEBUG(1, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__, 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;
}

static struct net_device_stats *via_ircc_net_get_stats(struct net_device
                                           *dev)
{
      struct via_ircc_cb *self = (struct via_ircc_cb *) dev->priv;

      return &self->stats;
}

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

module_init(via_ircc_init);
module_exit(via_ircc_cleanup);

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