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jade_irq.c

/* $Id: jade_irq.c,v 1.7.2.4 2004/02/11 13:21:34 keil Exp $
 *
 * Low level JADE IRQ stuff (derived from original hscx_irq.c)
 *
 * 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.
 *
 */

static inline void
waitforCEC(struct IsdnCardState *cs, int jade, int reg)
{
      int to = 50;
      int mask = (reg == jade_HDLC_XCMD ? jadeSTAR_XCEC : jadeSTAR_RCEC);
      while ((READJADE(cs, jade, jade_HDLC_STAR) & mask) && to) {
            udelay(1);
            to--;
      }
      if (!to)
            printk(KERN_WARNING "HiSax: waitforCEC (jade) timeout\n");
}


static inline void
waitforXFW(struct IsdnCardState *cs, int jade)
{
      /* Does not work on older jade versions, don't care */
}

static inline void
WriteJADECMDR(struct IsdnCardState *cs, int jade, int reg, u_char data)
{
      waitforCEC(cs, jade, reg);
      WRITEJADE(cs, jade, reg, data);
}



static void
jade_empty_fifo(struct BCState *bcs, int count)
{
      u_char *ptr;
      struct IsdnCardState *cs = bcs->cs;

      if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
            debugl1(cs, "jade_empty_fifo");

      if (bcs->hw.hscx.rcvidx + count > HSCX_BUFMAX) {
            if (cs->debug & L1_DEB_WARN)
                  debugl1(cs, "jade_empty_fifo: incoming packet too large");
            WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_RCMD, jadeRCMD_RMC);
            bcs->hw.hscx.rcvidx = 0;
            return;
      }
      ptr = bcs->hw.hscx.rcvbuf + bcs->hw.hscx.rcvidx;
      bcs->hw.hscx.rcvidx += count;
      READJADEFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
      WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_RCMD, jadeRCMD_RMC);
      if (cs->debug & L1_DEB_HSCX_FIFO) {
            char *t = bcs->blog;

            t += sprintf(t, "jade_empty_fifo %c cnt %d",
                       bcs->hw.hscx.hscx ? 'B' : 'A', count);
            QuickHex(t, ptr, count);
            debugl1(cs, bcs->blog);
      }
}

static void
jade_fill_fifo(struct BCState *bcs)
{
      struct IsdnCardState *cs = bcs->cs;
      int more, count;
      int fifo_size = 32;
      u_char *ptr;

      if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
            debugl1(cs, "jade_fill_fifo");

      if (!bcs->tx_skb)
            return;
      if (bcs->tx_skb->len <= 0)
            return;

      more = (bcs->mode == L1_MODE_TRANS) ? 1 : 0;
      if (bcs->tx_skb->len > fifo_size) {
            more = !0;
            count = fifo_size;
      } else
            count = bcs->tx_skb->len;

      waitforXFW(cs, bcs->hw.hscx.hscx);
      ptr = bcs->tx_skb->data;
      skb_pull(bcs->tx_skb, count);
      bcs->tx_cnt -= count;
      bcs->hw.hscx.count += count;
      WRITEJADEFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
      WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_XCMD, more ? jadeXCMD_XF : (jadeXCMD_XF|jadeXCMD_XME));
      if (cs->debug & L1_DEB_HSCX_FIFO) {
            char *t = bcs->blog;

            t += sprintf(t, "jade_fill_fifo %c cnt %d",
                       bcs->hw.hscx.hscx ? 'B' : 'A', count);
            QuickHex(t, ptr, count);
            debugl1(cs, bcs->blog);
      }
}


static void
jade_interrupt(struct IsdnCardState *cs, u_char val, u_char jade)
{
      u_char r;
      struct BCState *bcs = cs->bcs + jade;
      struct sk_buff *skb;
      int fifo_size = 32;
      int count;
      int i_jade = (int) jade; /* To satisfy the compiler */
      
      if (!test_bit(BC_FLG_INIT, &bcs->Flag))
            return;

      if (val & 0x80) { /* RME */
            r = READJADE(cs, i_jade, jade_HDLC_RSTA);
            if ((r & 0xf0) != 0xa0) {
                  if (!(r & 0x80))
                        if (cs->debug & L1_DEB_WARN)
                              debugl1(cs, "JADE %s invalid frame", (jade ? "B":"A"));
                  if ((r & 0x40) && bcs->mode)
                        if (cs->debug & L1_DEB_WARN)
                              debugl1(cs, "JADE %c RDO mode=%d", 'A'+jade, bcs->mode);
                  if (!(r & 0x20))
                        if (cs->debug & L1_DEB_WARN)
                              debugl1(cs, "JADE %c CRC error", 'A'+jade);
                  WriteJADECMDR(cs, jade, jade_HDLC_RCMD, jadeRCMD_RMC);
            } else {
                  count = READJADE(cs, i_jade, jade_HDLC_RBCL) & 0x1F;
                  if (count == 0)
                        count = fifo_size;
                  jade_empty_fifo(bcs, count);
                  if ((count = bcs->hw.hscx.rcvidx - 1) > 0) {
                        if (cs->debug & L1_DEB_HSCX_FIFO)
                              debugl1(cs, "HX Frame %d", count);
                        if (!(skb = dev_alloc_skb(count)))
                              printk(KERN_WARNING "JADE %s receive out of memory\n", (jade ? "B":"A"));
                        else {
                              memcpy(skb_put(skb, count), bcs->hw.hscx.rcvbuf, count);
                              skb_queue_tail(&bcs->rqueue, skb);
                        }
                  }
            }
            bcs->hw.hscx.rcvidx = 0;
            schedule_event(bcs, B_RCVBUFREADY);
      }
      if (val & 0x40) { /* RPF */
            jade_empty_fifo(bcs, fifo_size);
            if (bcs->mode == L1_MODE_TRANS) {
                  /* receive audio data */
                  if (!(skb = dev_alloc_skb(fifo_size)))
                        printk(KERN_WARNING "HiSax: receive out of memory\n");
                  else {
                        memcpy(skb_put(skb, fifo_size), bcs->hw.hscx.rcvbuf, fifo_size);
                        skb_queue_tail(&bcs->rqueue, skb);
                  }
                  bcs->hw.hscx.rcvidx = 0;
                  schedule_event(bcs, B_RCVBUFREADY);
            }
      }
      if (val & 0x10) { /* XPR */
            if (bcs->tx_skb) {
                  if (bcs->tx_skb->len) {
                        jade_fill_fifo(bcs);
                        return;
                  } else {
                        if (test_bit(FLG_LLI_L1WAKEUP,&bcs->st->lli.flag) &&
                              (PACKET_NOACK != bcs->tx_skb->pkt_type)) {
                              u_long      flags;
                              spin_lock_irqsave(&bcs->aclock, flags);
                              bcs->ackcnt += bcs->hw.hscx.count;
                              spin_unlock_irqrestore(&bcs->aclock, flags);
                              schedule_event(bcs, B_ACKPENDING);
                        }
                        dev_kfree_skb_irq(bcs->tx_skb);
                        bcs->hw.hscx.count = 0;
                        bcs->tx_skb = NULL;
                  }
            }
            if ((bcs->tx_skb = skb_dequeue(&bcs->squeue))) {
                  bcs->hw.hscx.count = 0;
                  test_and_set_bit(BC_FLG_BUSY, &bcs->Flag);
                  jade_fill_fifo(bcs);
            } else {
                  test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
                  schedule_event(bcs, B_XMTBUFREADY);
            }
      }
}

static inline void
jade_int_main(struct IsdnCardState *cs, u_char val, int jade)
{
      struct BCState *bcs;
      bcs = cs->bcs + jade;
      
      if (val & jadeISR_RFO) {
            /* handled with RDO */
            val &= ~jadeISR_RFO;
      }
      if (val & jadeISR_XDU) {
            /* relevant in HDLC mode only */
            /* don't reset XPR here */
            if (bcs->mode == 1)
                  jade_fill_fifo(bcs);
            else {
                  /* Here we lost an TX interrupt, so
                     * restart transmitting the whole frame.
                   */
                  if (bcs->tx_skb) {
                        skb_push(bcs->tx_skb, bcs->hw.hscx.count);
                        bcs->tx_cnt += bcs->hw.hscx.count;
                        bcs->hw.hscx.count = 0;
                  }
                  WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_XCMD, jadeXCMD_XRES);
                  if (cs->debug & L1_DEB_WARN)
                        debugl1(cs, "JADE %c EXIR %x Lost TX", 'A'+jade, val);
            }
      }
      if (val & (jadeISR_RME|jadeISR_RPF|jadeISR_XPR)) {
            if (cs->debug & L1_DEB_HSCX)
                  debugl1(cs, "JADE %c interrupt %x", 'A'+jade, val);
            jade_interrupt(cs, val, jade);
      }
}

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