text: /* 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 "hisax.h"
  #include "isac.h"
  #include "isdnl1.h"
  #include "amd7930_fn.h"
  #include <linux/interrupt.h>
  #include <linux/ppp_defs.h>
  #include <linux/pci.h>
  #include <linux/init.h>
  #include "netjet.h"
  
  
  
  static const char *enternow_pci_rev = "$Revision: 1.1.4.5 $";
  
  
  /* for PowerISDN PCI */
  #define TJ_AMD_IRQ                                              0x20
  #define TJ_LED1                                                 0x40
  #define TJ_LED2                                                 0x80
  
  
  /* The window to [the] AMD [chip]...
   * From address hw.njet.base + TJ_AMD_PORT onwards, the AMD
   * maps [consecutive/multiple] 8 bits into the TigerJet I/O space
   * -> 0x01 of the AMD at hw.njet.base + 0C4 */
  #define TJ_AMD_PORT                                             0xC0
  
  
  
  /* *************************** I/O-Interface functions ************************************* */
  
  
  /* cs->readisac, macro rByteAMD */
  static unsigned char
  ReadByteAmd7930(struct IsdnCardState *cs, unsigned char offset)
  {
  	/* direct register */
  	if(offset < 8)
  		return (inb(cs->hw.njet.isac + 4*offset));
  
  	/* indirect register */
  	else {
  		outb(offset, cs->hw.njet.isac + 4*AMD_CR);
  		return(inb(cs->hw.njet.isac + 4*AMD_DR));
  	}
  }
  
  /* cs->writeisac, macro wByteAMD */
  static void
  WriteByteAmd7930(struct IsdnCardState *cs, unsigned char offset, unsigned char value)
  {
  	/* direct register */
  	if(offset < 8)
  		outb(value, cs->hw.njet.isac + 4*offset);
  
  	/* indirect register */
  	else {
  		outb(offset, cs->hw.njet.isac + 4*AMD_CR);
  		outb(value, cs->hw.njet.isac + 4*AMD_DR);
  	}
  }
  
  
  static void
  enpci_setIrqMask(struct IsdnCardState *cs, unsigned char val) {
          if (!val)
  	        outb(0x00, cs->hw.njet.base+NETJET_IRQMASK1);
          else
  	        outb(TJ_AMD_IRQ, cs->hw.njet.base+NETJET_IRQMASK1);
  }
  
  
  static unsigned char dummyrr(struct IsdnCardState *cs, int chan, unsigned char off)
  {
          return(5);
  }
  
  static void dummywr(struct IsdnCardState *cs, int chan, unsigned char off, unsigned char 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;
  	outb(cs->hw.njet.ctrl_reg, cs->hw.njet.base + NETJET_CTRL);
  	mdelay(20);
  	/* Reset off */
  	cs->hw.njet.ctrl_reg = 0x30;
  	outb(cs->hw.njet.ctrl_reg, cs->hw.njet.base + NETJET_CTRL);
  	/* 20ms delay */
  	mdelay(20);
  	cs->hw.njet.auxd = 0;  // LED-status
  	cs->hw.njet.dmactrl = 0;
  	outb(~TJ_AMD_IRQ, cs->hw.njet.base + NETJET_AUXCTRL);
  	outb(TJ_AMD_IRQ, cs->hw.njet.base + NETJET_IRQMASK1);
  	outb(cs->hw.njet.auxd, cs->hw.njet.auxa); // LED off
  }
  
  
  static int
  enpci_card_msg(struct IsdnCardState *cs, int mt, void *arg)
  {
  	u_long flags;
          unsigned char *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;
                          outb(cs->hw.njet.auxd, cs->hw.njet.base + NETJET_AUXDATA);
                          break;
                  case MDL_REMOVE:
                          /* TEI removed, LEDs off */
  	                cs->hw.njet.auxd = 0;
                          outb(0x00, cs->hw.njet.base + NETJET_AUXDATA);
                          break;
                  case MDL_BC_ASSIGN:
                          /* activate B-channel */
                          chan = (unsigned char *)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;
                          outb(cs->hw.njet.auxd, cs->hw.njet.base + NETJET_AUXDATA);
                          break;
                  case MDL_BC_RELEASE:
                          /* deactivate B-channel */
                          chan = (unsigned char *)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);
                                  outb(cs->hw.njet.auxd, cs->hw.njet.base + NETJET_AUXDATA);
                          }
                          break;
                  default:
                          break;
  
  	}
  	return(0);
  }
  
  static irqreturn_t
  enpci_interrupt(int intno, void *dev_id)
  {
  	struct IsdnCardState *cs = dev_id;
  	unsigned char s0val, s1val, ir;
  	u_long flags;
  
  	spin_lock_irqsave(&cs->lock, flags);
  	s1val = inb(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 = inb(cs->hw.njet.base + NETJET_IRQSTAT0);
  	if ((s0val | s1val)==0) { // shared IRQ
  		spin_unlock_irqrestore(&cs->lock, flags);
  		return IRQ_NONE;
  	} 
  	if (s0val)
  		outb(s0val, cs->hw.njet.base + NETJET_IRQSTAT0);
  
  	/* 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 int __devinit en_pci_probe(struct pci_dev *dev_netjet,
  				  struct IsdnCardState *cs)
  {
  	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);
  	}
  
  	return(1);
  }
  
  static void __devinit en_cs_init(struct IsdnCard *card,
  				 struct IsdnCardState *cs)
  {
  	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
  	outb(cs->hw.njet.ctrl_reg, cs->hw.njet.base + NETJET_CTRL);
  	/* 20 ms Pause */
  	mdelay(20);
  
  	cs->hw.njet.ctrl_reg = 0x30;  /* Reset Off and status read clear */
  	outb(cs->hw.njet.ctrl_reg, cs->hw.njet.base + NETJET_CTRL);
  	mdelay(10);
  
  	cs->hw.njet.auxd = 0x00; // war 0xc0
  	cs->hw.njet.dmactrl = 0;
  
  	outb(~TJ_AMD_IRQ, cs->hw.njet.base + NETJET_AUXCTRL);
  	outb(TJ_AMD_IRQ, cs->hw.njet.base + NETJET_IRQMASK1);
  	outb(cs->hw.njet.auxd, cs->hw.njet.auxa);
  }
  
  static int __devinit en_cs_init_rest(struct IsdnCard *card,
  				     struct IsdnCardState *cs)
  {
  	const int 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: enter:now config port %lx-%lx already in use\n",
  		       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 |= IRQF_SHARED;
  
  	return (1);
  }
  
  static struct pci_dev *dev_netjet __devinitdata = NULL;
  
  /* called by config.c */
  int __devinit
  setup_enternow_pci(struct IsdnCard *card)
  {
  	int ret;
  	struct IsdnCardState *cs = card->cs;
  	char tmp[64];
  
  #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))) {
  			ret = en_pci_probe(dev_netjet, cs);
  			if (!ret)
  				return(0);
  		} else {
                          printk(KERN_WARNING "enter:now PCI: No PCI card found\n");
  			return(0);
  		}
  
  		en_cs_init(card, cs);
  		break;
  	}
  
          return en_cs_init_rest(card, cs);
  }
  