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bkm_a4t.c

/* $Id: bkm_a4t.c,v 1.22.2.4 2004/01/14 16:04:48 keil Exp $
 *
 * low level stuff for T-Berkom A4T
 *
 * Author       Roland Klabunde
 * Copyright    by Roland Klabunde   <R.Klabunde@Berkom.de>
 * 
 * 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 "hscx.h"
#include "jade.h"
#include "isdnl1.h"
#include <linux/pci.h>
#include "bkm_ax.h"

extern const char *CardType[];

static const char *bkm_a4t_revision = "$Revision: 1.22.2.4 $";


static inline u_char
readreg(unsigned int ale, unsigned long adr, u_char off)
{
      register u_int ret;
      unsigned int *po = (unsigned int *) adr;  /* Postoffice */

      *po = (GCS_2 | PO_WRITE | off);
      __WAITI20__(po);
      *po = (ale | PO_READ);
      __WAITI20__(po);
      ret = *po;
      return ((unsigned char) ret);
}


static inline void
readfifo(unsigned int ale, unsigned long adr, u_char off, u_char * data, int size)
{
      int i;
      for (i = 0; i < size; i++)
            *data++ = readreg(ale, adr, off);
}


static inline void
writereg(unsigned int ale, unsigned long adr, u_char off, u_char data)
{
      unsigned int *po = (unsigned int *) adr;  /* Postoffice */
      *po = (GCS_2 | PO_WRITE | off);
      __WAITI20__(po);
      *po = (ale | PO_WRITE | data);
      __WAITI20__(po);
}


static inline void
writefifo(unsigned int ale, unsigned long adr, u_char off, u_char * data, int size)
{
      int i;

      for (i = 0; i < size; i++)
            writereg(ale, adr, off, *data++);
}


/* Interface functions */

static u_char
ReadISAC(struct IsdnCardState *cs, u_char offset)
{
      return (readreg(cs->hw.ax.isac_ale, cs->hw.ax.isac_adr, offset));
}

static void
WriteISAC(struct IsdnCardState *cs, u_char offset, u_char value)
{
      writereg(cs->hw.ax.isac_ale, cs->hw.ax.isac_adr, offset, value);
}

static void
ReadISACfifo(struct IsdnCardState *cs, u_char * data, int size)
{
      readfifo(cs->hw.ax.isac_ale, cs->hw.ax.isac_adr, 0, data, size);
}

static void
WriteISACfifo(struct IsdnCardState *cs, u_char * data, int size)
{
      writefifo(cs->hw.ax.isac_ale, cs->hw.ax.isac_adr, 0, data, size);
}

static u_char
ReadJADE(struct IsdnCardState *cs, int jade, u_char offset)
{
      return (readreg(cs->hw.ax.jade_ale, cs->hw.ax.jade_adr, offset + (jade == -1 ? 0 : (jade ? 0xC0 : 0x80))));
}

static void
WriteJADE(struct IsdnCardState *cs, int jade, u_char offset, u_char value)
{
      writereg(cs->hw.ax.jade_ale, cs->hw.ax.jade_adr, offset + (jade == -1 ? 0 : (jade ? 0xC0 : 0x80)), value);
}

/*
 * fast interrupt JADE stuff goes here
 */

#define READJADE(cs, nr, reg) readreg(cs->hw.ax.jade_ale,\
            cs->hw.ax.jade_adr, reg + (nr == -1 ? 0 : (nr ? 0xC0 : 0x80)))
#define WRITEJADE(cs, nr, reg, data) writereg(cs->hw.ax.jade_ale,\
            cs->hw.ax.jade_adr, reg + (nr == -1 ? 0 : (nr ? 0xC0 : 0x80)), data)

#define READJADEFIFO(cs, nr, ptr, cnt) readfifo(cs->hw.ax.jade_ale,\
            cs->hw.ax.jade_adr, (nr == -1 ? 0 : (nr ? 0xC0 : 0x80)), ptr, cnt)
#define WRITEJADEFIFO(cs, nr, ptr, cnt) writefifo( cs->hw.ax.jade_ale,\
            cs->hw.ax.jade_adr, (nr == -1 ? 0 : (nr ? 0xC0 : 0x80)), ptr, cnt)

#include "jade_irq.c"

static irqreturn_t
bkm_interrupt(int intno, void *dev_id)
{
      struct IsdnCardState *cs = dev_id;
      u_char val = 0;
      u_long flags;
      I20_REGISTER_FILE *pI20_Regs;

      spin_lock_irqsave(&cs->lock, flags);
      pI20_Regs = (I20_REGISTER_FILE *) (cs->hw.ax.base);

      /* ISDN interrupt pending? */
      if (pI20_Regs->i20IntStatus & intISDN) {
            /* Reset the ISDN interrupt     */
            pI20_Regs->i20IntStatus = intISDN;
            /* Disable ISDN interrupt */
            pI20_Regs->i20IntCtrl &= ~intISDN;
            /* Channel A first */
            val = readreg(cs->hw.ax.jade_ale, cs->hw.ax.jade_adr, jade_HDLC_ISR + 0x80);
            if (val) {
                  jade_int_main(cs, val, 0);
            }
            /* Channel B  */
            val = readreg(cs->hw.ax.jade_ale, cs->hw.ax.jade_adr, jade_HDLC_ISR + 0xC0);
            if (val) {
                  jade_int_main(cs, val, 1);
            }
            /* D-Channel */
            val = readreg(cs->hw.ax.isac_ale, cs->hw.ax.isac_adr, ISAC_ISTA);
            if (val) {
                  isac_interrupt(cs, val);
            }
            /* Reenable ISDN interrupt */
            pI20_Regs->i20IntCtrl |= intISDN;
            spin_unlock_irqrestore(&cs->lock, flags);
            return IRQ_HANDLED;
      } else {
            spin_unlock_irqrestore(&cs->lock, flags);
            return IRQ_NONE;
      }
}

static void
release_io_bkm(struct IsdnCardState *cs)
{
      if (cs->hw.ax.base) {
            iounmap((void *) cs->hw.ax.base);
            cs->hw.ax.base = 0;
      }
}

static void
enable_bkm_int(struct IsdnCardState *cs, unsigned bEnable)
{
      if (cs->typ == ISDN_CTYPE_BKM_A4T) {
            I20_REGISTER_FILE *pI20_Regs = (I20_REGISTER_FILE *) (cs->hw.ax.base);
            if (bEnable)
                  pI20_Regs->i20IntCtrl |= (intISDN | intPCI);
            else
                  /* CAUTION: This disables the video capture driver too */
                  pI20_Regs->i20IntCtrl &= ~(intISDN | intPCI);
      }
}

static void
reset_bkm(struct IsdnCardState *cs)
{
      if (cs->typ == ISDN_CTYPE_BKM_A4T) {
            I20_REGISTER_FILE *pI20_Regs = (I20_REGISTER_FILE *) (cs->hw.ax.base);
            /* Issue the I20 soft reset     */
            pI20_Regs->i20SysControl = 0xFF;    /* all in */
            mdelay(10);
            /* Remove the soft reset */
            pI20_Regs->i20SysControl = sysRESET | 0xFF;
            mdelay(10);
            /* Set our configuration */
            pI20_Regs->i20SysControl = sysRESET | sysCFG;
            /* Issue ISDN reset     */
            pI20_Regs->i20GuestControl = guestWAIT_CFG |
                g_A4T_JADE_RES |
                g_A4T_ISAR_RES |
                g_A4T_ISAC_RES |
                g_A4T_JADE_BOOTR |
                g_A4T_ISAR_BOOTR;
            mdelay(10);

            /* Remove RESET state from ISDN */
            pI20_Regs->i20GuestControl &= ~(g_A4T_ISAC_RES |
                                    g_A4T_JADE_RES |
                                    g_A4T_ISAR_RES);
            mdelay(10);
      }
}

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

      switch (mt) {
            case CARD_RESET:
                  /* Disable ints */
                  spin_lock_irqsave(&cs->lock, flags);
                  enable_bkm_int(cs, 0);
                  reset_bkm(cs);
                  spin_unlock_irqrestore(&cs->lock, flags);
                  return (0);
            case CARD_RELEASE:
                  /* Sanity */
                  spin_lock_irqsave(&cs->lock, flags);
                  enable_bkm_int(cs, 0);
                  reset_bkm(cs);
                  spin_unlock_irqrestore(&cs->lock, flags);
                  release_io_bkm(cs);
                  return (0);
            case CARD_INIT:
                  spin_lock_irqsave(&cs->lock, flags);
                  clear_pending_isac_ints(cs);
                  clear_pending_jade_ints(cs);
                  initisac(cs);
                  initjade(cs);
                  /* Enable ints */
                  enable_bkm_int(cs, 1);
                  spin_unlock_irqrestore(&cs->lock, flags);
                  return (0);
            case CARD_TEST:
                  return (0);
      }
      return (0);
}

static int __devinit a4t_pci_probe(struct pci_dev *dev_a4t,
                           struct IsdnCardState *cs,
                           u_int *found,
                           u_int *pci_memaddr)
{
      u16 sub_sys;
      u16 sub_vendor;

      sub_vendor = dev_a4t->subsystem_vendor;
      sub_sys = dev_a4t->subsystem_device;
      if ((sub_sys == PCI_DEVICE_ID_BERKOM_A4T) && (sub_vendor == PCI_VENDOR_ID_BERKOM)) {
            if (pci_enable_device(dev_a4t))
                  return (0); /* end loop & function */
            *found = 1;
            *pci_memaddr = pci_resource_start(dev_a4t, 0);
            cs->irq = dev_a4t->irq;
            return (1);       /* end loop */
      }

      return (-1);                  /* continue looping */
}

static int __devinit a4t_cs_init(struct IsdnCard *card,
                         struct IsdnCardState *cs,
                         u_int pci_memaddr)
{
      I20_REGISTER_FILE *pI20_Regs;

      if (!cs->irq) {         /* IRQ range check ?? */
            printk(KERN_WARNING "HiSax: %s: No IRQ\n", CardType[card->typ]);
            return (0);
      }
      cs->hw.ax.base = (long) ioremap(pci_memaddr, 4096);
      /* Check suspecious address */
      pI20_Regs = (I20_REGISTER_FILE *) (cs->hw.ax.base);
      if ((pI20_Regs->i20IntStatus & 0x8EFFFFFF) != 0) {
            printk(KERN_WARNING "HiSax: %s address %lx-%lx suspecious\n",
                   CardType[card->typ], cs->hw.ax.base, cs->hw.ax.base + 4096);
            iounmap((void *) cs->hw.ax.base);
            cs->hw.ax.base = 0;
            return (0);
      }
      cs->hw.ax.isac_adr = cs->hw.ax.base + PO_OFFSET;
      cs->hw.ax.jade_adr = cs->hw.ax.base + PO_OFFSET;
      cs->hw.ax.isac_ale = GCS_1;
      cs->hw.ax.jade_ale = GCS_3;

      printk(KERN_INFO "HiSax: %s: Card configured at 0x%lX IRQ %d\n",
             CardType[card->typ], cs->hw.ax.base, cs->irq);

      setup_isac(cs);
      cs->readisac = &ReadISAC;
      cs->writeisac = &WriteISAC;
      cs->readisacfifo = &ReadISACfifo;
      cs->writeisacfifo = &WriteISACfifo;
      cs->BC_Read_Reg = &ReadJADE;
      cs->BC_Write_Reg = &WriteJADE;
      cs->BC_Send_Data = &jade_fill_fifo;
      cs->cardmsg = &BKM_card_msg;
      cs->irq_func = &bkm_interrupt;
      cs->irq_flags |= IRQF_SHARED;
      ISACVersion(cs, "Telekom A4T:");
      /* Jade version */
      JadeVersion(cs, "Telekom A4T:");

      return (1);
}

static struct pci_dev *dev_a4t __devinitdata = NULL;

int __devinit
setup_bkm_a4t(struct IsdnCard *card)
{
      struct IsdnCardState *cs = card->cs;
      char tmp[64];
      u_int pci_memaddr = 0, found = 0;
      int ret;

      strcpy(tmp, bkm_a4t_revision);
      printk(KERN_INFO "HiSax: T-Berkom driver Rev. %s\n", HiSax_getrev(tmp));
      if (cs->typ == ISDN_CTYPE_BKM_A4T) {
            cs->subtyp = BKM_A4T;
      } else
            return (0);

      while ((dev_a4t = pci_find_device(PCI_VENDOR_ID_ZORAN,
            PCI_DEVICE_ID_ZORAN_36120, dev_a4t))) {
            ret = a4t_pci_probe(dev_a4t, cs, &found, &pci_memaddr);
            if (!ret)
                  return (0);
            if (ret > 0)
                  break;
      }
      if (!found) {
            printk(KERN_WARNING "HiSax: %s: Card not found\n", CardType[card->typ]);
            return (0);
      }
      if (!pci_memaddr) {
            printk(KERN_WARNING "HiSax: %s: No Memory base address\n", CardType[card->typ]);
            return (0);
      }

      return a4t_cs_init(card, cs, pci_memaddr);
}

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