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nj_s.c

/* $Id: nj_s.c,v 2.13.2.4 2004/01/16 01:53:48 keil Exp $
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */

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

static const char *NETjet_S_revision = "$Revision: 2.13.2.4 $";

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

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

static irqreturn_t
netjet_s_interrupt(int intno, void *dev_id)
{
      struct IsdnCardState *cs = dev_id;
      u_char val, s1val, s0val;
      u_long flags;

      spin_lock_irqsave(&cs->lock, flags);
      s1val = bytein(cs->hw.njet.base + NETJET_IRQSTAT1);
      if (!(s1val & NETJET_ISACIRQ)) {
            val = NETjet_ReadIC(cs, ISAC_ISTA);
            if (cs->debug & L1_DEB_ISAC)
                  debugl1(cs, "tiger: i1 %x %x", s1val, val);
            if (val) {
                  isac_interrupt(cs, val);
                  NETjet_WriteIC(cs, ISAC_MASK, 0xFF);
                  NETjet_WriteIC(cs, ISAC_MASK, 0x0);
            }
            s1val = 1;
      } else
            s1val = 0;
      /* 
       * read/write stat0 is better, because lower IRQ rate
       * Note the IRQ is on for 125 us if a condition match
       * thats long on modern CPU and so the IRQ is reentered
       * all the time.
       */
      s0val = bytein(cs->hw.njet.base + NETJET_IRQSTAT0);
      if ((s0val | s1val)==0) { // shared IRQ
            spin_unlock_irqrestore(&cs->lock, flags);
            return IRQ_NONE;
      } 
      if (s0val)
            byteout(cs->hw.njet.base + NETJET_IRQSTAT0, s0val);
      /* start new code 13/07/00 GE */
      /* 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 |= 0x02;
      else  /* the 1st read page is free */
            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)) {
                  printk(KERN_WARNING "nj LOCK_ATOMIC s0val %x->%x\n",
                        cs->hw.njet.last_is0, s0val);
                  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);
            /* end new code 13/07/00 GE */
            test_and_clear_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags);
      }
      spin_unlock_irqrestore(&cs->lock, flags);
      return IRQ_HANDLED;
}

static void
reset_netjet_s(struct IsdnCardState *cs)
{
      cs->hw.njet.ctrl_reg = 0xff;  /* Reset On */
      byteout(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
      mdelay(10);
      /* now edge triggered for TJ320 GE 13/07/00 */
      /* see comment in IRQ function */
      if (cs->subtyp) /* TJ320 */
            cs->hw.njet.ctrl_reg = 0x40;  /* Reset Off and status read clear */
      else
            cs->hw.njet.ctrl_reg = 0x00;  /* Reset Off and status read clear */
      byteout(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
      mdelay(10);
      cs->hw.njet.auxd = 0;
      cs->hw.njet.dmactrl = 0;
      byteout(cs->hw.njet.base + NETJET_AUXCTRL, ~NETJET_ISACIRQ);
      byteout(cs->hw.njet.base + NETJET_IRQMASK1, NETJET_ISACIRQ);
      byteout(cs->hw.njet.auxa, cs->hw.njet.auxd);
}

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

      switch (mt) {
            case CARD_RESET:
                  spin_lock_irqsave(&cs->lock, flags);
                  reset_netjet_s(cs);
                  spin_unlock_irqrestore(&cs->lock, flags);
                  return(0);
            case CARD_RELEASE:
                  release_io_netjet(cs);
                  return(0);
            case CARD_INIT:
                  reset_netjet_s(cs);
                  inittiger(cs);
                  spin_lock_irqsave(&cs->lock, flags);
                  clear_pending_isac_ints(cs);
                  initisac(cs);
                  /* Reenable all IRQ */
                  cs->writeisac(cs, ISAC_MASK, 0);
                  spin_unlock_irqrestore(&cs->lock, flags);
                  return(0);
            case CARD_TEST:
                  return(0);
      }
      return(0);
}

static int __devinit njs_pci_probe(struct pci_dev *dev_netjet,
                           struct IsdnCardState *cs)
{
      u32 cfg;

      if (pci_enable_device(dev_netjet))
            return(0);
      pci_set_master(dev_netjet);
      cs->irq = dev_netjet->irq;
      if (!cs->irq) {
            printk(KERN_WARNING "NETjet-S: 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 "NETjet-S: No IO-Adr for PCI card found\n");
            return(0);
      }
      /* the TJ300 and TJ320 must be detected, the IRQ handling is different
       * unfortunatly the chips use the same device ID, but the TJ320 has
       * the bit20 in status PCI cfg register set
       */
      pci_read_config_dword(dev_netjet, 0x04, &cfg);
      if (cfg & 0x00100000)
            cs->subtyp = 1; /* TJ320 */
      else
            cs->subtyp = 0; /* TJ300 */
      /* 2001/10/04 Christoph Ersfeld, Formula-n Europe AG www.formula-n.com */
      if ((dev_netjet->subsystem_vendor == 0x55) &&
            (dev_netjet->subsystem_device == 0x02)) {
            printk(KERN_WARNING "Netjet: You tried to load this driver with an incompatible TigerJet-card\n");
            printk(KERN_WARNING "Use type=41 for Formula-n enter:now ISDN PCI and compatible\n");
            return(0);
      }
      /* end new code */

      return(1);
}

static int __devinit njs_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 | NETJET_ISAC_OFF;

      cs->hw.njet.ctrl_reg = 0xff;  /* Reset On */
      byteout(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
      mdelay(10);

      cs->hw.njet.ctrl_reg = 0x00;  /* Reset Off and status read clear */
      byteout(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
      mdelay(10);

      cs->hw.njet.auxd = 0xC0;
      cs->hw.njet.dmactrl = 0;

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

      switch ( ( ( NETjet_ReadIC( cs, ISAC_RBCH ) >> 5 ) & 3 ) )
      {
            case 0 :
                  return 1;   /* end loop */

            case 3 :
                  printk( KERN_WARNING "NETjet-S: NETspider-U PCI card found\n" );
                  return -1;  /* continue looping */

            default :
                  printk( KERN_WARNING "NETjet-S: No PCI card found\n" );
                  return 0;   /* end loop & function */
      }
      return 1;               /* end loop */
}

static int __devinit njs_cs_init_rest(struct IsdnCard *card,
                              struct IsdnCardState *cs)
{
      const int bytecnt = 256;

      printk(KERN_INFO
            "NETjet-S: %s card configured at %#lx IRQ %d\n",
            cs->subtyp ? "TJ320" : "TJ300", cs->hw.njet.base, cs->irq);
      if (!request_region(cs->hw.njet.base, bytecnt, "netjet-s 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);
      }
      cs->readisac  = &NETjet_ReadIC;
      cs->writeisac = &NETjet_WriteIC;
      cs->readisacfifo  = &NETjet_ReadICfifo;
      cs->writeisacfifo = &NETjet_WriteICfifo;
      cs->BC_Read_Reg  = &dummyrr;
      cs->BC_Write_Reg = &dummywr;
      cs->BC_Send_Data = &netjet_fill_dma;
      setup_isac(cs);
      cs->cardmsg = &NETjet_S_card_msg;
      cs->irq_func = &netjet_s_interrupt;
      cs->irq_flags |= IRQF_SHARED;
      ISACVersion(cs, "NETjet-S:");

      return (1);
}

static struct pci_dev *dev_netjet __devinitdata = NULL;

int __devinit
setup_netjet_s(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, NETjet_S_revision);
      printk(KERN_INFO "HiSax: Traverse Tech. NETjet-S driver Rev. %s\n", HiSax_getrev(tmp));
      if (cs->typ != ISDN_CTYPE_NETJET_S)
            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 = njs_pci_probe(dev_netjet, cs);
                  if (!ret)
                        return(0);
            } else {
                  printk(KERN_WARNING "NETjet-S: No PCI card found\n");
                  return(0);
            }

            ret = njs_cs_init(card, cs);
            if (!ret)
                  return(0);
            if (ret > 0)
                  break;
            /* otherwise, ret < 0, continue looping */
      }

      return njs_cs_init_rest(card, cs);
}

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