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enternow_pci.c

/* 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;  // gešndert 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);
}

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