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s0box.c

/* $Id: s0box.c,v 2.6.2.4 2004/01/13 23:48:39 keil Exp $
 *
 * low level stuff for Creatix S0BOX
 *
 * Author       Enrik Berkhan
 * Copyright    by Enrik Berkhan <enrik@starfleet.inka.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 "isdnl1.h"

extern const char *CardType[];
static const char *s0box_revision = "$Revision: 2.6.2.4 $";

static inline void
writereg(unsigned int padr, signed int addr, u_char off, u_char val) {
      outb_p(0x1c,padr+2);
      outb_p(0x14,padr+2);
      outb_p((addr+off)&0x7f,padr);
      outb_p(0x16,padr+2);
      outb_p(val,padr);
      outb_p(0x17,padr+2);
      outb_p(0x14,padr+2);
      outb_p(0x1c,padr+2);
}

static u_char nibtab[] = { 1, 9, 5, 0xd, 3, 0xb, 7, 0xf,
                   0, 0, 0, 0, 0, 0, 0, 0,
                   0, 8, 4, 0xc, 2, 0xa, 6, 0xe } ;

static inline u_char
readreg(unsigned int padr, signed int addr, u_char off) {
      register u_char n1, n2;

      outb_p(0x1c,padr+2);
      outb_p(0x14,padr+2);
      outb_p((addr+off)|0x80,padr);
      outb_p(0x16,padr+2);
      outb_p(0x17,padr+2);
      n1 = (inb_p(padr+1) >> 3) & 0x17;
      outb_p(0x16,padr+2);
      n2 = (inb_p(padr+1) >> 3) & 0x17;
      outb_p(0x14,padr+2);
      outb_p(0x1c,padr+2);
      return nibtab[n1] | (nibtab[n2] << 4);
}

static inline void
read_fifo(unsigned int padr, signed int adr, u_char * data, int size)
{
      int i;
      register u_char n1, n2;
      
      outb_p(0x1c, padr+2);
      outb_p(0x14, padr+2);
      outb_p(adr|0x80, padr);
      outb_p(0x16, padr+2);
      for (i=0; i<size; i++) {
            outb_p(0x17, padr+2);
            n1 = (inb_p(padr+1) >> 3) & 0x17;
            outb_p(0x16,padr+2);
            n2 = (inb_p(padr+1) >> 3) & 0x17;
            *(data++)=nibtab[n1] | (nibtab[n2] << 4);
      }
      outb_p(0x14,padr+2);
      outb_p(0x1c,padr+2);
      return;
}

static inline void
write_fifo(unsigned int padr, signed int adr, u_char * data, int size)
{
      int i;
      outb_p(0x1c, padr+2);
      outb_p(0x14, padr+2);
      outb_p(adr&0x7f, padr);
      for (i=0; i<size; i++) {
            outb_p(0x16, padr+2);
            outb_p(*(data++), padr);
            outb_p(0x17, padr+2);
      }
      outb_p(0x14,padr+2);
      outb_p(0x1c,padr+2);
      return;
}

/* Interface functions */

static u_char
ReadISAC(struct IsdnCardState *cs, u_char offset)
{
      return (readreg(cs->hw.teles3.cfg_reg, cs->hw.teles3.isac, offset));
}

static void
WriteISAC(struct IsdnCardState *cs, u_char offset, u_char value)
{
      writereg(cs->hw.teles3.cfg_reg, cs->hw.teles3.isac, offset, value);
}

static void
ReadISACfifo(struct IsdnCardState *cs, u_char * data, int size)
{
      read_fifo(cs->hw.teles3.cfg_reg, cs->hw.teles3.isacfifo, data, size);
}

static void
WriteISACfifo(struct IsdnCardState *cs, u_char * data, int size)
{
      write_fifo(cs->hw.teles3.cfg_reg, cs->hw.teles3.isacfifo, data, size);
}

static u_char
ReadHSCX(struct IsdnCardState *cs, int hscx, u_char offset)
{
      return (readreg(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscx[hscx], offset));
}

static void
WriteHSCX(struct IsdnCardState *cs, int hscx, u_char offset, u_char value)
{
      writereg(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscx[hscx], offset, value);
}

/*
 * fast interrupt HSCX stuff goes here
 */

#define READHSCX(cs, nr, reg) readreg(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscx[nr], reg)
#define WRITEHSCX(cs, nr, reg, data) writereg(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscx[nr], reg, data)
#define READHSCXFIFO(cs, nr, ptr, cnt) read_fifo(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscxfifo[nr], ptr, cnt)
#define WRITEHSCXFIFO(cs, nr, ptr, cnt) write_fifo(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscxfifo[nr], ptr, cnt)

#include "hscx_irq.c"

static irqreturn_t
s0box_interrupt(int intno, void *dev_id)
{
#define MAXCOUNT 5
      struct IsdnCardState *cs = dev_id;
      u_char val;
      u_long flags;
      int count = 0;

      spin_lock_irqsave(&cs->lock, flags);
      val = readreg(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscx[1], HSCX_ISTA);
      Start_HSCX:
      if (val)
            hscx_int_main(cs, val);
      val = readreg(cs->hw.teles3.cfg_reg, cs->hw.teles3.isac, ISAC_ISTA);
      Start_ISAC:
      if (val)
            isac_interrupt(cs, val);
      count++;
      val = readreg(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscx[1], HSCX_ISTA);
      if (val && count < MAXCOUNT) {
            if (cs->debug & L1_DEB_HSCX)
                  debugl1(cs, "HSCX IntStat after IntRoutine");
            goto Start_HSCX;
      }
      val = readreg(cs->hw.teles3.cfg_reg, cs->hw.teles3.isac, ISAC_ISTA);
      if (val && count < MAXCOUNT) {
            if (cs->debug & L1_DEB_ISAC)
                  debugl1(cs, "ISAC IntStat after IntRoutine");
            goto Start_ISAC;
      }
      if (count >= MAXCOUNT)
            printk(KERN_WARNING "S0Box: more than %d loops in s0box_interrupt\n", count);
      writereg(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscx[0], HSCX_MASK, 0xFF);
      writereg(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscx[1], HSCX_MASK, 0xFF);
      writereg(cs->hw.teles3.cfg_reg, cs->hw.teles3.isac, ISAC_MASK, 0xFF);
      writereg(cs->hw.teles3.cfg_reg, cs->hw.teles3.isac, ISAC_MASK, 0x0);
      writereg(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscx[0], HSCX_MASK, 0x0);
      writereg(cs->hw.teles3.cfg_reg, cs->hw.teles3.hscx[1], HSCX_MASK, 0x0);
      spin_unlock_irqrestore(&cs->lock, flags);
      return IRQ_HANDLED;
}

static void
release_io_s0box(struct IsdnCardState *cs)
{
      release_region(cs->hw.teles3.cfg_reg, 8);
}

static int
S0Box_card_msg(struct IsdnCardState *cs, int mt, void *arg)
{
      u_long flags;

      switch (mt) {
            case CARD_RESET:
                  break;
            case CARD_RELEASE:
                  release_io_s0box(cs);
                  break;
            case CARD_INIT:
                  spin_lock_irqsave(&cs->lock, flags);
                  inithscxisac(cs, 3);
                  spin_unlock_irqrestore(&cs->lock, flags);
                  break;
            case CARD_TEST:
                  break;
      }
      return(0);
}

int __devinit
setup_s0box(struct IsdnCard *card)
{
      struct IsdnCardState *cs = card->cs;
      char tmp[64];

      strcpy(tmp, s0box_revision);
      printk(KERN_INFO "HiSax: S0Box IO driver Rev. %s\n", HiSax_getrev(tmp));
      if (cs->typ != ISDN_CTYPE_S0BOX)
            return (0);

      cs->hw.teles3.cfg_reg = card->para[1];
      cs->hw.teles3.hscx[0] = -0x20;
      cs->hw.teles3.hscx[1] = 0x0;
      cs->hw.teles3.isac = 0x20;
      cs->hw.teles3.isacfifo = cs->hw.teles3.isac + 0x3e;
      cs->hw.teles3.hscxfifo[0] = cs->hw.teles3.hscx[0] + 0x3e;
      cs->hw.teles3.hscxfifo[1] = cs->hw.teles3.hscx[1] + 0x3e;
      cs->irq = card->para[0];
      if (!request_region(cs->hw.teles3.cfg_reg,8, "S0Box parallel I/O")) {
            printk(KERN_WARNING
                   "HiSax: %s ports %x-%x already in use\n",
                   CardType[cs->typ],
                       cs->hw.teles3.cfg_reg,
                       cs->hw.teles3.cfg_reg + 7);
            return 0;
      }
      printk(KERN_INFO
            "HiSax: %s config irq:%d isac:0x%x  cfg:0x%x\n",
            CardType[cs->typ], cs->irq,
            cs->hw.teles3.isac, cs->hw.teles3.cfg_reg);
      printk(KERN_INFO
            "HiSax: hscx A:0x%x  hscx B:0x%x\n",
            cs->hw.teles3.hscx[0], cs->hw.teles3.hscx[1]);
      setup_isac(cs);
      cs->readisac = &ReadISAC;
      cs->writeisac = &WriteISAC;
      cs->readisacfifo = &ReadISACfifo;
      cs->writeisacfifo = &WriteISACfifo;
      cs->BC_Read_Reg = &ReadHSCX;
      cs->BC_Write_Reg = &WriteHSCX;
      cs->BC_Send_Data = &hscx_fill_fifo;
      cs->cardmsg = &S0Box_card_msg;
      cs->irq_func = &s0box_interrupt;
      ISACVersion(cs, "S0Box:");
      if (HscxVersion(cs, "S0Box:")) {
            printk(KERN_WARNING
                   "S0Box: wrong HSCX versions check IO address\n");
            release_io_s0box(cs);
            return (0);
      }
      return (1);
}

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