drivers/isdn/hisax/enternow_pci.c - maze/linux - Git at Google

 /* enternow_pci.c,v 0.99 2001/10/02
  *
  * enternow_pci.c       Card-specific routines for
  *                      Formula-n enter:now ISDN PCI ab
  *                      Gerdes AG Power ISDN PCI
  *                      Woerltronic SA 16 PCI
  *                      (based on HiSax driver by Karsten Keil)
  *
  * Author               Christoph Ersfeld <info@formula-n.de>
  *                      Formula-n Europe AG (www.formula-n.com)
  *                      previously Gerdes AG
  *
  *
  *                      This file is (c) under GNU PUBLIC LICENSE
  *
  * Notes:
  * This driver interfaces to netjet.c which performs B-channel
  * processing.
  *
  * Version 0.99 is the first release of this driver and there are
  * certainly a few bugs.
  * It isn't testet on linux 2.4 yet, so consider this code to be
  * beta.
  *
  * Please don't report me any malfunction without sending
  * (compressed) debug-logs.
  * It would be nearly impossible to retrace it.
  *
  * Log D-channel-processing as follows:
  *
  * 1. Load hisax with card-specific parameters, this example ist for
  *    Formula-n enter:now ISDN PCI and compatible
  *    (f.e. Gerdes Power ISDN PCI)
  *
  *    modprobe hisax type=41 protocol=2 id=gerdes
  *
  *    if you chose an other value for id, you need to modify the
  *    code below, too.
  *
  * 2. set debug-level
  *
  *    hisaxctrl gerdes 1 0x3ff
  *    hisaxctrl gerdes 11 0x4f
  *    cat /dev/isdnctrl >> ~/log &
  *
  * Please take also a look into /var/log/messages if there is
  * anything importand concerning HISAX.
  *
  *
  * Credits:
  * Programming the driver for Formula-n enter:now ISDN PCI and
  * necessary the driver for the used Amd 7930 D-channel-controller
  * was spnsored by Formula-n Europe AG.
  * Thanks to Karsten Keil and Petr Novak, who gave me support in
  * Hisax-specific questions.
  * I want so say special thanks to Carl-Friedrich Braun, who had to
  * answer a lot of questions about generally ISDN and about handling
  * of the Amd-Chip.
  *
  */


 #include <linux/config.h>
 #include "hisax.h"
 #include "isac.h"
 #include "isdnl1.h"
 #include "amd7930_fn.h"
 #include "enternow.h"
 #include <linux/interrupt.h>
 #include <linux/ppp_defs.h>
 #include <linux/pci.h>
 #include <linux/init.h>
 #include "netjet.h"


 const char *enternow_pci_rev = "$Revision: 1.1.4.5 $";


 /* *************************** I/O-Interface functions ************************************* */


 /* cs->readisac, macro rByteAMD */
 BYTE
 ReadByteAmd7930(struct IsdnCardState *cs, BYTE offset)
 {
 	/* direktes Register */
 	if(offset < 8)
 		return (InByte(cs->hw.njet.isac + 4*offset));

 	/* indirektes Register */
 	else {
 		OutByte(cs->hw.njet.isac + 4*AMD_CR, offset);
 		return(InByte(cs->hw.njet.isac + 4*AMD_DR));
 	}
 }

 /* cs->writeisac, macro wByteAMD */
 void
 WriteByteAmd7930(struct IsdnCardState *cs, BYTE offset, BYTE value)
 {
 	/* direktes Register */
 	if(offset < 8)
 		OutByte(cs->hw.njet.isac + 4*offset, value);

 	/* indirektes Register */
 	else {
 		OutByte(cs->hw.njet.isac + 4*AMD_CR, offset);
 		OutByte(cs->hw.njet.isac + 4*AMD_DR, value);
 	}
 }


 void
 enpci_setIrqMask(struct IsdnCardState *cs, BYTE val) {
         if (!val)
 	        OutByte(cs->hw.njet.base+NETJET_IRQMASK1, 0x00);
         else
 	        OutByte(cs->hw.njet.base+NETJET_IRQMASK1, TJ_AMD_IRQ);
 }


 static BYTE dummyrr(struct IsdnCardState *cs, int chan, BYTE off)
 {
         return(5);
 }

 static void dummywr(struct IsdnCardState *cs, int chan, BYTE off, BYTE value)
 {

 }


 /* ******************************************************************************** */


 static void
 reset_enpci(struct IsdnCardState *cs)
 {
 	if (cs->debug & L1_DEB_ISAC)
 		debugl1(cs, "enter:now PCI: reset");

 	/* Reset on, (also for AMD) */
 	cs->hw.njet.ctrl_reg = 0x07;
 	OutByte(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
 	mdelay(20);
 	/* Reset off */
 	cs->hw.njet.ctrl_reg = 0x30;
 	OutByte(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
 	/* 20ms delay */
 	mdelay(20);
 	cs->hw.njet.auxd = 0;  // LED-status
 	cs->hw.njet.dmactrl = 0;
 	OutByte(cs->hw.njet.base + NETJET_AUXCTRL, ~TJ_AMD_IRQ);
 	OutByte(cs->hw.njet.base + NETJET_IRQMASK1, TJ_AMD_IRQ);
 	OutByte(cs->hw.njet.auxa, cs->hw.njet.auxd); // LED off
 }


 static int
 enpci_card_msg(struct IsdnCardState *cs, int mt, void *arg)
 {
 	u_long flags;
         BYTE *chan;

 	if (cs->debug & L1_DEB_ISAC)
 		debugl1(cs, "enter:now PCI: card_msg: 0x%04X", mt);

         switch (mt) {
 		case CARD_RESET:
 			spin_lock_irqsave(&cs->lock, flags);
 			reset_enpci(cs);
                         Amd7930_init(cs);
                         spin_unlock_irqrestore(&cs->lock, flags);
 			break;
 		case CARD_RELEASE:
 			release_io_netjet(cs);
 			break;
 		case CARD_INIT:
 			reset_enpci(cs);
 			inittiger(cs);
 			/* irq must be on here */
 			Amd7930_init(cs);
 			break;
 		case CARD_TEST:
 			break;
                 case MDL_ASSIGN:
                         /* TEI assigned, LED1 on */
                         cs->hw.njet.auxd = TJ_AMD_IRQ << 1;
                         OutByte(cs->hw.njet.base + NETJET_AUXDATA, cs->hw.njet.auxd);
                         break;
                 case MDL_REMOVE:
                         /* TEI removed, LEDs off */
 	                cs->hw.njet.auxd = 0;
                         OutByte(cs->hw.njet.base + NETJET_AUXDATA, 0x00);
                         break;
                 case MDL_BC_ASSIGN:
                         /* activate B-channel */
                         chan = (BYTE *)arg;

                         if (cs->debug & L1_DEB_ISAC)
 		                debugl1(cs, "enter:now PCI: assign phys. BC %d in AMD LMR1", *chan);

                         cs->dc.amd7930.ph_command(cs, (cs->dc.amd7930.lmr1 | (*chan + 1)), "MDL_BC_ASSIGN");
                         /* at least one b-channel in use, LED 2 on */
                         cs->hw.njet.auxd |= TJ_AMD_IRQ << 2;
                         OutByte(cs->hw.njet.base + NETJET_AUXDATA, cs->hw.njet.auxd);
                         break;
                 case MDL_BC_RELEASE:
                         /* deactivate B-channel */
                         chan = (BYTE *)arg;

                         if (cs->debug & L1_DEB_ISAC)
 		                debugl1(cs, "enter:now PCI: release phys. BC %d in Amd LMR1", *chan);

                         cs->dc.amd7930.ph_command(cs, (cs->dc.amd7930.lmr1 & ~(*chan + 1)), "MDL_BC_RELEASE");
                         /* no b-channel active -> LED2 off */
                         if (!(cs->dc.amd7930.lmr1 & 3)) {
                                 cs->hw.njet.auxd &= ~(TJ_AMD_IRQ << 2);
                                 OutByte(cs->hw.njet.base + NETJET_AUXDATA, cs->hw.njet.auxd);
                         }
                         break;
                 default:
                         break;

 	}
 	return(0);
 }

 static irqreturn_t
 enpci_interrupt(int intno, void *dev_id, struct pt_regs *regs)
 {
 	struct IsdnCardState *cs = dev_id;
 	BYTE s0val, s1val, ir;
 	u_long flags;

 	spin_lock_irqsave(&cs->lock, flags);
 	s1val = InByte(cs->hw.njet.base + NETJET_IRQSTAT1);

         /* AMD threw an interrupt */
 	if (!(s1val & TJ_AMD_IRQ)) {
                 /* read and clear interrupt-register */
 		ir = ReadByteAmd7930(cs, 0x00);
 		Amd7930_interrupt(cs, ir);
 		s1val = 1;
 	} else
 		s1val = 0;
 	s0val = InByte(cs->hw.njet.base + NETJET_IRQSTAT0);
 	if ((s0val | s1val)==0) { // shared IRQ
 		spin_unlock_irqrestore(&cs->lock, flags);
 		return IRQ_NONE;
 	}
 	if (s0val)
 		OutByte(cs->hw.njet.base + NETJET_IRQSTAT0, s0val);

 	/* DMA-Interrupt: B-channel-stuff */
 	/* set bits in sval to indicate which page is free */
 	if (inl(cs->hw.njet.base + NETJET_DMA_WRITE_ADR) <
 		inl(cs->hw.njet.base + NETJET_DMA_WRITE_IRQ))
 		/* the 2nd write page is free */
 		s0val = 0x08;
 	else	/* the 1st write page is free */
 		s0val = 0x04;
 	if (inl(cs->hw.njet.base + NETJET_DMA_READ_ADR) <
 		inl(cs->hw.njet.base + NETJET_DMA_READ_IRQ))
 		/* the 2nd read page is free */
 		s0val = s0val | 0x02;
 	else	/* the 1st read page is free */
 		s0val = s0val | 0x01;
 	if (s0val != cs->hw.njet.last_is0) /* we have a DMA interrupt */
 	{
 		if (test_and_set_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags)) {
 			spin_unlock_irqrestore(&cs->lock, flags);
 			return IRQ_HANDLED;
 		}
 		cs->hw.njet.irqstat0 = s0val;
 		if ((cs->hw.njet.irqstat0 & NETJET_IRQM0_READ) !=
 			(cs->hw.njet.last_is0 & NETJET_IRQM0_READ))
 			/* we have a read dma int */
 			read_tiger(cs);
 		if ((cs->hw.njet.irqstat0 & NETJET_IRQM0_WRITE) !=
 			(cs->hw.njet.last_is0 & NETJET_IRQM0_WRITE))
 			/* we have a write dma int */
 			write_tiger(cs);
 		test_and_clear_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags);
 	}
 	spin_unlock_irqrestore(&cs->lock, flags);
 	return IRQ_HANDLED;
 }


 static struct pci_dev *dev_netjet __initdata = NULL;

 /* called by config.c */
 int __init
 setup_enternow_pci(struct IsdnCard *card)
 {
 	int bytecnt;
 	struct IsdnCardState *cs = card->cs;
 	char tmp[64];

 #ifdef CONFIG_PCI
 #ifdef __BIG_ENDIAN
 #error "not running on big endian machines now"
 #endif
         strcpy(tmp, enternow_pci_rev);
 	printk(KERN_INFO "HiSax: Formula-n Europe AG enter:now ISDN PCI driver Rev. %s\n", HiSax_getrev(tmp));
 	if (cs->typ != ISDN_CTYPE_ENTERNOW)
 		return(0);
 	test_and_clear_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags);

 	for ( ;; )
 	{
 		if ((dev_netjet = pci_find_device(PCI_VENDOR_ID_TIGERJET,
 			PCI_DEVICE_ID_TIGERJET_300,  dev_netjet))) {
 			if (pci_enable_device(dev_netjet))
 				return(0);
 			cs->irq = dev_netjet->irq;
 			if (!cs->irq) {
 				printk(KERN_WARNING "enter:now PCI: No IRQ for PCI card found\n");
 				return(0);
 			}
 			cs->hw.njet.base = pci_resource_start(dev_netjet, 0);
 			if (!cs->hw.njet.base) {
 				printk(KERN_WARNING "enter:now PCI: No IO-Adr for PCI card found\n");
 				return(0);
 			}
                         /* checks Sub-Vendor ID because system crashes with Traverse-Card */
 			if ((dev_netjet->subsystem_vendor != 0x55) ||
 				(dev_netjet->subsystem_device != 0x02)) {
 				printk(KERN_WARNING "enter:now: You tried to load this driver with an incompatible TigerJet-card\n");
                                 printk(KERN_WARNING "Use type=20 for Traverse NetJet PCI Card.\n");
                                 return(0);
                         }
 		} else {
                         printk(KERN_WARNING "enter:now PCI: No PCI card found\n");
 			return(0);
 		}

 		cs->hw.njet.auxa = cs->hw.njet.base + NETJET_AUXDATA;
 		cs->hw.njet.isac = cs->hw.njet.base + 0xC0; // Fenster zum AMD

 		/* Reset an */
 		cs->hw.njet.ctrl_reg = 0x07;  // geändert von 0xff
 		OutByte(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
 		/* 20 ms Pause */
 		mdelay(20);

 		cs->hw.njet.ctrl_reg = 0x30;  /* Reset Off and status read clear */
 		OutByte(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
 		mdelay(10);

 		cs->hw.njet.auxd = 0x00; // war 0xc0
 		cs->hw.njet.dmactrl = 0;

 		OutByte(cs->hw.njet.base + NETJET_AUXCTRL, ~TJ_AMD_IRQ);
 		OutByte(cs->hw.njet.base + NETJET_IRQMASK1, TJ_AMD_IRQ);
 		OutByte(cs->hw.njet.auxa, cs->hw.njet.auxd);

 		break;
 	}
 #else

 	printk(KERN_WARNING "enter:now PCI: NO_PCI_BIOS\n");
 	printk(KERN_WARNING "enter:now PCI: unable to config Formula-n enter:now ISDN PCI ab\n");
 	return (0);

 #endif /* CONFIG_PCI */

 	bytecnt = 256;

 	printk(KERN_INFO
 		"enter:now PCI: PCI card configured at 0x%lx IRQ %d\n",
 		cs->hw.njet.base, cs->irq);
 	if (!request_region(cs->hw.njet.base, bytecnt, "Fn_ISDN")) {
 		printk(KERN_WARNING
 			   "HiSax: %s config port %lx-%lx already in use\n",
 			   CardType[card->typ],
 			   cs->hw.njet.base,
 			   cs->hw.njet.base + bytecnt);
 		return (0);
 	}
 	setup_Amd7930(cs);
 	cs->hw.njet.last_is0 = 0;
         /* macro rByteAMD */
         cs->readisac = &ReadByteAmd7930;
         /* macro wByteAMD */
         cs->writeisac = &WriteByteAmd7930;
         cs->dc.amd7930.setIrqMask = &enpci_setIrqMask;

         cs->BC_Read_Reg  = &dummyrr;
 	cs->BC_Write_Reg = &dummywr;
 	cs->BC_Send_Data = &netjet_fill_dma;
 	cs->cardmsg = &enpci_card_msg;
 	cs->irq_func = &enpci_interrupt;
 	cs->irq_flags |= SA_SHIRQ;

         return (1);
 }
	/* enternow_pci.c,v 0.99 2001/10/02
	*
	* enternow_pci.c Card-specific routines for
	* Formula-n enter:now ISDN PCI ab
	* Gerdes AG Power ISDN PCI
	* Woerltronic SA 16 PCI
	* (based on HiSax driver by Karsten Keil)
	*
	* Author Christoph Ersfeld <info@formula-n.de>
	* Formula-n Europe AG (www.formula-n.com)
	* previously Gerdes AG
	*
	*
	* This file is (c) under GNU PUBLIC LICENSE
	*
	* Notes:
	* This driver interfaces to netjet.c which performs B-channel
	* processing.
	*
	* Version 0.99 is the first release of this driver and there are
	* certainly a few bugs.
	* It isn't testet on linux 2.4 yet, so consider this code to be
	* beta.
	*
	* Please don't report me any malfunction without sending
	* (compressed) debug-logs.
	* It would be nearly impossible to retrace it.
	*
	* Log D-channel-processing as follows:
	*
	* 1. Load hisax with card-specific parameters, this example ist for
	* Formula-n enter:now ISDN PCI and compatible
	* (f.e. Gerdes Power ISDN PCI)
	*
	* modprobe hisax type=41 protocol=2 id=gerdes
	*
	* if you chose an other value for id, you need to modify the
	* code below, too.
	*
	* 2. set debug-level
	*
	* hisaxctrl gerdes 1 0x3ff
	* hisaxctrl gerdes 11 0x4f
	* cat /dev/isdnctrl >> ~/log &
	*
	* Please take also a look into /var/log/messages if there is
	* anything importand concerning HISAX.
	*
	*
	* Credits:
	* Programming the driver for Formula-n enter:now ISDN PCI and
	* necessary the driver for the used Amd 7930 D-channel-controller
	* was spnsored by Formula-n Europe AG.
	* Thanks to Karsten Keil and Petr Novak, who gave me support in
	* Hisax-specific questions.
	* I want so say special thanks to Carl-Friedrich Braun, who had to
	* answer a lot of questions about generally ISDN and about handling
	* of the Amd-Chip.
	*
	*/


	#include <linux/config.h>
	#include "hisax.h"
	#include "isac.h"
	#include "isdnl1.h"
	#include "amd7930_fn.h"
	#include "enternow.h"
	#include <linux/interrupt.h>
	#include <linux/ppp_defs.h>
	#include <linux/pci.h>
	#include <linux/init.h>
	#include "netjet.h"



	const char *enternow_pci_rev = "$Revision: 1.1.4.5 $";


	/* ************************* I/O-Interface functions *********************************** */


	/* cs->readisac, macro rByteAMD */
	BYTE
	ReadByteAmd7930(struct IsdnCardState *cs, BYTE offset)
	{
	/* direktes Register */
	if(offset < 8)
	return (InByte(cs->hw.njet.isac + 4*offset));

	/* indirektes Register */
	else {
	OutByte(cs->hw.njet.isac + 4*AMD_CR, offset);
	return(InByte(cs->hw.njet.isac + 4*AMD_DR));
	}
	}

	/* cs->writeisac, macro wByteAMD */
	void
	WriteByteAmd7930(struct IsdnCardState *cs, BYTE offset, BYTE value)
	{
	/* direktes Register */
	if(offset < 8)
	OutByte(cs->hw.njet.isac + 4*offset, value);

	/* indirektes Register */
	else {
	OutByte(cs->hw.njet.isac + 4*AMD_CR, offset);
	OutByte(cs->hw.njet.isac + 4*AMD_DR, value);
	}
	}


	void
	enpci_setIrqMask(struct IsdnCardState *cs, BYTE val) {
	if (!val)
	OutByte(cs->hw.njet.base+NETJET_IRQMASK1, 0x00);
	else
	OutByte(cs->hw.njet.base+NETJET_IRQMASK1, TJ_AMD_IRQ);
	}


	static BYTE dummyrr(struct IsdnCardState *cs, int chan, BYTE off)
	{
	return(5);
	}

	static void dummywr(struct IsdnCardState *cs, int chan, BYTE off, BYTE value)
	{

	}


	/* ******************************************************************************** */


	static void
	reset_enpci(struct IsdnCardState *cs)
	{
	if (cs->debug & L1_DEB_ISAC)
	debugl1(cs, "enter:now PCI: reset");

	/* Reset on, (also for AMD) */
	cs->hw.njet.ctrl_reg = 0x07;
	OutByte(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
	mdelay(20);
	/* Reset off */
	cs->hw.njet.ctrl_reg = 0x30;
	OutByte(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
	/* 20ms delay */
	mdelay(20);
	cs->hw.njet.auxd = 0; // LED-status
	cs->hw.njet.dmactrl = 0;
	OutByte(cs->hw.njet.base + NETJET_AUXCTRL, ~TJ_AMD_IRQ);
	OutByte(cs->hw.njet.base + NETJET_IRQMASK1, TJ_AMD_IRQ);
	OutByte(cs->hw.njet.auxa, cs->hw.njet.auxd); // LED off
	}


	static int
	enpci_card_msg(struct IsdnCardState cs, int mt, void arg)
	{
	u_long flags;
	BYTE *chan;

	if (cs->debug & L1_DEB_ISAC)
	debugl1(cs, "enter:now PCI: card_msg: 0x%04X", mt);

	switch (mt) {
	case CARD_RESET:
	spin_lock_irqsave(&cs->lock, flags);
	reset_enpci(cs);
	Amd7930_init(cs);
	spin_unlock_irqrestore(&cs->lock, flags);
	break;
	case CARD_RELEASE:
	release_io_netjet(cs);
	break;
	case CARD_INIT:
	reset_enpci(cs);
	inittiger(cs);
	/* irq must be on here */
	Amd7930_init(cs);
	break;
	case CARD_TEST:
	break;
	case MDL_ASSIGN:
	/* TEI assigned, LED1 on */
	cs->hw.njet.auxd = TJ_AMD_IRQ << 1;
	OutByte(cs->hw.njet.base + NETJET_AUXDATA, cs->hw.njet.auxd);
	break;
	case MDL_REMOVE:
	/* TEI removed, LEDs off */
	cs->hw.njet.auxd = 0;
	OutByte(cs->hw.njet.base + NETJET_AUXDATA, 0x00);
	break;
	case MDL_BC_ASSIGN:
	/* activate B-channel */
	chan = (BYTE *)arg;

	if (cs->debug & L1_DEB_ISAC)
	debugl1(cs, "enter:now PCI: assign phys. BC %d in AMD LMR1", *chan);

	cs->dc.amd7930.ph_command(cs, (cs->dc.amd7930.lmr1 \| (*chan + 1)), "MDL_BC_ASSIGN");
	/* at least one b-channel in use, LED 2 on */
	cs->hw.njet.auxd \|= TJ_AMD_IRQ << 2;
	OutByte(cs->hw.njet.base + NETJET_AUXDATA, cs->hw.njet.auxd);
	break;
	case MDL_BC_RELEASE:
	/* deactivate B-channel */
	chan = (BYTE *)arg;

	if (cs->debug & L1_DEB_ISAC)
	debugl1(cs, "enter:now PCI: release phys. BC %d in Amd LMR1", *chan);

	cs->dc.amd7930.ph_command(cs, (cs->dc.amd7930.lmr1 & ~(*chan + 1)), "MDL_BC_RELEASE");
	/* no b-channel active -> LED2 off */
	if (!(cs->dc.amd7930.lmr1 & 3)) {
	cs->hw.njet.auxd &= ~(TJ_AMD_IRQ << 2);
	OutByte(cs->hw.njet.base + NETJET_AUXDATA, cs->hw.njet.auxd);
	}
	break;
	default:
	break;

	}
	return(0);
	}

	static irqreturn_t
	enpci_interrupt(int intno, void dev_id, struct pt_regs regs)
	{
	struct IsdnCardState *cs = dev_id;
	BYTE s0val, s1val, ir;
	u_long flags;

	spin_lock_irqsave(&cs->lock, flags);
	s1val = InByte(cs->hw.njet.base + NETJET_IRQSTAT1);

	/* AMD threw an interrupt */
	if (!(s1val & TJ_AMD_IRQ)) {
	/* read and clear interrupt-register */
	ir = ReadByteAmd7930(cs, 0x00);
	Amd7930_interrupt(cs, ir);
	s1val = 1;
	} else
	s1val = 0;
	s0val = InByte(cs->hw.njet.base + NETJET_IRQSTAT0);
	if ((s0val \| s1val)==0) { // shared IRQ
	spin_unlock_irqrestore(&cs->lock, flags);
	return IRQ_NONE;
	}
	if (s0val)
	OutByte(cs->hw.njet.base + NETJET_IRQSTAT0, s0val);

	/* DMA-Interrupt: B-channel-stuff */
	/* set bits in sval to indicate which page is free */
	if (inl(cs->hw.njet.base + NETJET_DMA_WRITE_ADR) <
	inl(cs->hw.njet.base + NETJET_DMA_WRITE_IRQ))
	/* the 2nd write page is free */
	s0val = 0x08;
	else /* the 1st write page is free */
	s0val = 0x04;
	if (inl(cs->hw.njet.base + NETJET_DMA_READ_ADR) <
	inl(cs->hw.njet.base + NETJET_DMA_READ_IRQ))
	/* the 2nd read page is free */
	s0val = s0val \| 0x02;
	else /* the 1st read page is free */
	s0val = s0val \| 0x01;
	if (s0val != cs->hw.njet.last_is0) /* we have a DMA interrupt */
	{
	if (test_and_set_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags)) {
	spin_unlock_irqrestore(&cs->lock, flags);
	return IRQ_HANDLED;
	}
	cs->hw.njet.irqstat0 = s0val;
	if ((cs->hw.njet.irqstat0 & NETJET_IRQM0_READ) !=
	(cs->hw.njet.last_is0 & NETJET_IRQM0_READ))
	/* we have a read dma int */
	read_tiger(cs);
	if ((cs->hw.njet.irqstat0 & NETJET_IRQM0_WRITE) !=
	(cs->hw.njet.last_is0 & NETJET_IRQM0_WRITE))
	/* we have a write dma int */
	write_tiger(cs);
	test_and_clear_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags);
	}
	spin_unlock_irqrestore(&cs->lock, flags);
	return IRQ_HANDLED;
	}


	static struct pci_dev *dev_netjet __initdata = NULL;

	/* called by config.c */
	int __init
	setup_enternow_pci(struct IsdnCard *card)
	{
	int bytecnt;
	struct IsdnCardState *cs = card->cs;
	char tmp[64];

	#ifdef CONFIG_PCI
	#ifdef __BIG_ENDIAN
	#error "not running on big endian machines now"
	#endif
	strcpy(tmp, enternow_pci_rev);
	printk(KERN_INFO "HiSax: Formula-n Europe AG enter:now ISDN PCI driver Rev. %s\n", HiSax_getrev(tmp));
	if (cs->typ != ISDN_CTYPE_ENTERNOW)
	return(0);
	test_and_clear_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags);

	for ( ;; )
	{
	if ((dev_netjet = pci_find_device(PCI_VENDOR_ID_TIGERJET,
	PCI_DEVICE_ID_TIGERJET_300, dev_netjet))) {
	if (pci_enable_device(dev_netjet))
	return(0);
	cs->irq = dev_netjet->irq;
	if (!cs->irq) {
	printk(KERN_WARNING "enter:now PCI: No IRQ for PCI card found\n");
	return(0);
	}
	cs->hw.njet.base = pci_resource_start(dev_netjet, 0);
	if (!cs->hw.njet.base) {
	printk(KERN_WARNING "enter:now PCI: No IO-Adr for PCI card found\n");
	return(0);
	}
	/* checks Sub-Vendor ID because system crashes with Traverse-Card */
	if ((dev_netjet->subsystem_vendor != 0x55) \|\|
	(dev_netjet->subsystem_device != 0x02)) {
	printk(KERN_WARNING "enter:now: You tried to load this driver with an incompatible TigerJet-card\n");
	printk(KERN_WARNING "Use type=20 for Traverse NetJet PCI Card.\n");
	return(0);
	}
	} else {
	printk(KERN_WARNING "enter:now PCI: No PCI card found\n");
	return(0);
	}

	cs->hw.njet.auxa = cs->hw.njet.base + NETJET_AUXDATA;
	cs->hw.njet.isac = cs->hw.njet.base + 0xC0; // Fenster zum AMD

	/* Reset an */
	cs->hw.njet.ctrl_reg = 0x07; // geändert von 0xff
	OutByte(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
	/* 20 ms Pause */
	mdelay(20);

	cs->hw.njet.ctrl_reg = 0x30; /* Reset Off and status read clear */
	OutByte(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
	mdelay(10);

	cs->hw.njet.auxd = 0x00; // war 0xc0
	cs->hw.njet.dmactrl = 0;

	OutByte(cs->hw.njet.base + NETJET_AUXCTRL, ~TJ_AMD_IRQ);
	OutByte(cs->hw.njet.base + NETJET_IRQMASK1, TJ_AMD_IRQ);
	OutByte(cs->hw.njet.auxa, cs->hw.njet.auxd);

	break;
	}
	#else

	printk(KERN_WARNING "enter:now PCI: NO_PCI_BIOS\n");
	printk(KERN_WARNING "enter:now PCI: unable to config Formula-n enter:now ISDN PCI ab\n");
	return (0);

	#endif /* CONFIG_PCI */

	bytecnt = 256;

	printk(KERN_INFO
	"enter:now PCI: PCI card configured at 0x%lx IRQ %d\n",
	cs->hw.njet.base, cs->irq);
	if (!request_region(cs->hw.njet.base, bytecnt, "Fn_ISDN")) {
	printk(KERN_WARNING
	"HiSax: %s config port %lx-%lx already in use\n",
	CardType[card->typ],
	cs->hw.njet.base,
	cs->hw.njet.base + bytecnt);
	return (0);
	}
	setup_Amd7930(cs);
	cs->hw.njet.last_is0 = 0;
	/* macro rByteAMD */
	cs->readisac = &ReadByteAmd7930;
	/* macro wByteAMD */
	cs->writeisac = &WriteByteAmd7930;
	cs->dc.amd7930.setIrqMask = &enpci_setIrqMask;

	cs->BC_Read_Reg = &dummyrr;
	cs->BC_Write_Reg = &dummywr;
	cs->BC_Send_Data = &netjet_fill_dma;
	cs->cardmsg = &enpci_card_msg;
	cs->irq_func = &enpci_interrupt;
	cs->irq_flags \|= SA_SHIRQ;

	return (1);
	}