ipacx.c

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

//----------------------------------------------------------
//----------------------------------------------------------
static void __devinit
dch_init(struct IsdnCardState *cs)
{
	printk(KERN_INFO "HiSax: IPACX ISDN driver v0.1.0\n");

	cs->tqueue.routine  = (void *)(void *) dch_bh;
	cs->setstack_d      = dch_setstack;
  
	cs->dbusytimer.function = (void *) dbusy_timer_handler;
	cs->dbusytimer.data = (long) cs;
	init_timer(&cs->dbusytimer);

  cs->writeisac(cs, IPACX_TR_CONF0, 0x00);  // clear LDD
  cs->writeisac(cs, IPACX_TR_CONF2, 0x00);  // enable transmitter
  cs->writeisac(cs, IPACX_MODED,    0xC9);  // transparent mode 0, RAC, stop/go
  cs->writeisac(cs, IPACX_MON_CR,   0x00);  // disable monitor channel
}


//==========================================================
// B channel functions
//==========================================================

//----------------------------------------------------------
// Entry point for commands
//----------------------------------------------------------
static void
bch_l2l1(struct PStack *st, int pr, void *arg)
{
	struct sk_buff *skb = arg;
	long flags;

	switch (pr) {
		case (PH_DATA | REQUEST):
			save_flags(flags);
			cli();
			if (st->l1.bcs->tx_skb) {
				skb_queue_tail(&st->l1.bcs->squeue, skb);
				restore_flags(flags);
			} else {
				st->l1.bcs->tx_skb = skb;
				set_bit(BC_FLG_BUSY, &st->l1.bcs->Flag);
				st->l1.bcs->hw.hscx.count = 0;
				restore_flags(flags);
        bch_fill_fifo(st->l1.bcs);
			}
			break;
		case (PH_PULL | INDICATION):
			if (st->l1.bcs->tx_skb) {
				printk(KERN_WARNING "HiSax bch_l2l1(): this shouldn't happen\n");
				break;
			}
			set_bit(BC_FLG_BUSY, &st->l1.bcs->Flag);
			st->l1.bcs->tx_skb = skb;
			st->l1.bcs->hw.hscx.count = 0;
      bch_fill_fifo(st->l1.bcs);
			break;
		case (PH_PULL | REQUEST):
			if (!st->l1.bcs->tx_skb) {
				clear_bit(FLG_L1_PULL_REQ, &st->l1.Flags);
				st->l1.l1l2(st, PH_PULL | CONFIRM, NULL);
			} else
				set_bit(FLG_L1_PULL_REQ, &st->l1.Flags);
			break;
		case (PH_ACTIVATE | REQUEST):
			set_bit(BC_FLG_ACTIV, &st->l1.bcs->Flag);
			bch_mode(st->l1.bcs, st->l1.mode, st->l1.bc);
			l1_msg_b(st, pr, arg);
			break;
		case (PH_DEACTIVATE | REQUEST):
			l1_msg_b(st, pr, arg);
			break;
		case (PH_DEACTIVATE | CONFIRM):
			clear_bit(BC_FLG_ACTIV, &st->l1.bcs->Flag);
			clear_bit(BC_FLG_BUSY, &st->l1.bcs->Flag);
			bch_mode(st->l1.bcs, 0, st->l1.bc);
			st->l1.l1l2(st, PH_DEACTIVATE | CONFIRM, NULL);
			break;
	}
}

//----------------------------------------------------------
// proceed with bottom half handler BChannel_bh()
//----------------------------------------------------------
static void
bch_sched_event(struct BCState *bcs, int event)
{
	bcs->event |= 1 << event;
	queue_task(&bcs->tqueue, &tq_immediate);
	mark_bh(IMMEDIATE_BH);
}

//----------------------------------------------------------
// Read B channel fifo to receive buffer
//----------------------------------------------------------
static void
bch_empty_fifo(struct BCState *bcs, int count)
{
	u_char *ptr, hscx;
	struct IsdnCardState *cs;
	long flags;
	int cnt;

	cs = bcs->cs;
  hscx = bcs->hw.hscx.hscx;
	if ((cs->debug &L1_DEB_HSCX) && !(cs->debug &L1_DEB_HSCX_FIFO))
		debugl1(cs, "bch_empty_fifo()");

  // message too large, remove
	if (bcs->hw.hscx.rcvidx + count > HSCX_BUFMAX) {
		if (cs->debug &L1_DEB_WARN)
			debugl1(cs, "bch_empty_fifo() incoming packet too large");
	  cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x80);  // RMC
		bcs->hw.hscx.rcvidx = 0;
		return;
	}
  
  // Read data uninterruptible
	save_flags(flags);
	cli();
	ptr = bcs->hw.hscx.rcvbuf + bcs->hw.hscx.rcvidx;
	cnt = count;
	while (cnt--) *ptr++ = cs->BC_Read_Reg(cs, hscx, IPACX_RFIFOB); 
	cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x80);  // RMC
  
	ptr = bcs->hw.hscx.rcvbuf + bcs->hw.hscx.rcvidx;
	bcs->hw.hscx.rcvidx += count;
	restore_flags(flags);
  
	if (cs->debug &L1_DEB_HSCX_FIFO) {
		char *t = bcs->blog;

		t += sprintf(t, "bch_empty_fifo() B-%d cnt %d", hscx, count);
		QuickHex(t, ptr, count);
		debugl1(cs, bcs->blog);
	}
}

//----------------------------------------------------------
// Fill buffer to transmit FIFO
//----------------------------------------------------------
static void
bch_fill_fifo(struct BCState *bcs)
{
	struct IsdnCardState *cs;
	int more, count, cnt;
	u_char *ptr, *p, hscx;
	long flags;

	cs = bcs->cs;
	if ((cs->debug &L1_DEB_HSCX) && !(cs->debug &L1_DEB_HSCX_FIFO))
		debugl1(cs, "bch_fill_fifo()");

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

	hscx = bcs->hw.hscx.hscx;
	more = (bcs->mode == L1_MODE_TRANS) ? 1 : 0;
	if (bcs->tx_skb->len > B_FIFO_SIZE) {
		more  = 1;
		count = B_FIFO_SIZE;
	} else {
		count = bcs->tx_skb->len;
	}  
	cnt = count;
    
	save_flags(flags);
	cli();
	p = ptr = bcs->tx_skb->data;
	skb_pull(bcs->tx_skb, count);
	bcs->tx_cnt -= count;
	bcs->hw.hscx.count += count;
	while (cnt--) cs->BC_Write_Reg(cs, hscx, IPACX_XFIFOB, *p++); 
	cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, (more ? 0x08 : 0x0a));
	restore_flags(flags);
  
	if (cs->debug &L1_DEB_HSCX_FIFO) {
		char *t = bcs->blog;

		t += sprintf(t, "chb_fill_fifo() B-%d cnt %d", hscx, count);
		QuickHex(t, ptr, count);
		debugl1(cs, bcs->blog);
	}
}

//----------------------------------------------------------
// B channel interrupt handler
//----------------------------------------------------------
static void
bch_int(struct IsdnCardState *cs, u_char hscx)
{
	u_char istab;
	struct BCState *bcs;
	struct sk_buff *skb;
	int count;
	u_char rstab;

	bcs = cs->bcs + hscx;
	istab = cs->BC_Read_Reg(cs, hscx, IPACX_ISTAB);
//##############################################  
//	printk(KERN_WARNING "bch_int(istab=%02x)\n", istab);
//##############################################  
	if (!test_bit(BC_FLG_INIT, &bcs->Flag)) return;

	if (istab &0x80) {	// RME
		rstab = cs->BC_Read_Reg(cs, hscx, IPACX_RSTAB);
		if ((rstab &0xf0) != 0xa0) { // !(VFR && !RDO && CRC && !RAB)
			if (!(rstab &0x80))
				if (cs->debug &L1_DEB_WARN) 
          debugl1(cs, "bch_int() B-%d: invalid frame", hscx);
			if ((rstab &0x40) && (bcs->mode != L1_MODE_NULL))
				if (cs->debug &L1_DEB_WARN) 
          debugl1(cs, "bch_int() B-%d: RDO mode=%d", hscx, bcs->mode);
			if (!(rstab &0x20))
				if (cs->debug &L1_DEB_WARN) 
          debugl1(cs, "bch_int() B-%d: CRC error", hscx);
	    cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x80);  // RMC
		} 
    else {  // received frame ok
			count = cs->BC_Read_Reg(cs, hscx, IPACX_RBCLB) &(B_FIFO_SIZE-1);
			if (count == 0) count = B_FIFO_SIZE;
			bch_empty_fifo(bcs, count);
			if ((count = bcs->hw.hscx.rcvidx - 1) > 0) {
				if (cs->debug &L1_DEB_HSCX_FIFO)
					debugl1(cs, "bch_int Frame %d", count);
				if (!(skb = dev_alloc_skb(count)))
					printk(KERN_WARNING "HiSax bch_int(): receive frame out of memory\n");
				else {
					memcpy(skb_put(skb, count), bcs->hw.hscx.rcvbuf, count);
					skb_queue_tail(&bcs->rqueue, skb);
				}
			}
		}
		bcs->hw.hscx.rcvidx = 0;
		bch_sched_event(bcs, B_RCVBUFREADY);
	}
  
	if (istab &0x40) {	// RPF
		bch_empty_fifo(bcs, B_FIFO_SIZE);

		if (bcs->mode == L1_MODE_TRANS) { // queue every chunk
			// receive transparent audio data
			if (!(skb = dev_alloc_skb(B_FIFO_SIZE)))
				printk(KERN_WARNING "HiSax bch_int(): receive transparent out of memory\n");
			else {
				memcpy(skb_put(skb, B_FIFO_SIZE), bcs->hw.hscx.rcvbuf, B_FIFO_SIZE);
				skb_queue_tail(&bcs->rqueue, skb);
			}
			bcs->hw.hscx.rcvidx = 0;
			bch_sched_event(bcs, B_RCVBUFREADY);
		}
	}
  
	if (istab &0x20) {	// RFO
		if (cs->debug &L1_DEB_WARN) 
      debugl1(cs, "bch_int() B-%d: RFO error", hscx);
	  cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x40);  // RRES
	}

	if (istab &0x10) {	// XPR
		if (bcs->tx_skb) {
			if (bcs->tx_skb->len) {
		    bch_fill_fifo(bcs);
        goto afterXPR;
      }
      else {
				if (bcs->st->lli.l1writewakeup &&
					  (PACKET_NOACK != bcs->tx_skb->pkt_type)) {    
					bcs->st->lli.l1writewakeup(bcs->st, bcs->hw.hscx.count);
        }  
			  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;
      set_bit(BC_FLG_BUSY, &bcs->Flag);
      bch_fill_fifo(bcs);
    } else {
      clear_bit(BC_FLG_BUSY, &bcs->Flag);
      bch_sched_event(bcs, B_XMTBUFREADY);
    }
  }
  afterXPR:

	if (istab &0x04) {	// XDU
    if (bcs->mode == L1_MODE_TRANS) {
			bch_fill_fifo(bcs);
    }  
    else {
      if (bcs->tx_skb) {  // restart transmitting the whole frame
        skb_push(bcs->tx_skb, bcs->hw.hscx.count);
        bcs->tx_cnt += bcs->hw.hscx.count;
        bcs->hw.hscx.count = 0;
      }
	    cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x01);  // XRES
      if (cs->debug &L1_DEB_WARN)
        debugl1(cs, "bch_int() B-%d XDU error", hscx);
    }
	}
}

//----------------------------------------------------------
//----------------------------------------------------------
static void
bch_mode(struct BCState *bcs, int mode, int bc)
{
	struct IsdnCardState *cs = bcs->cs;
	int hscx = bcs->hw.hscx.hscx;

        bc = bc ? 1 : 0;  // in case bc is greater than 1
	if (cs->debug & L1_DEB_HSCX)
		debugl1(cs, "mode_bch() switch B-% mode %d chan %d", hscx, mode, bc);
	bcs->mode = mode;
	bcs->channel = bc;
  
  // map controller to according timeslot
  if (!hscx)
  {
    cs->writeisac(cs, IPACX_BCHA_TSDP_BC1, 0x80 | bc);
    cs->writeisac(cs, IPACX_BCHA_CR,       0x88); 
  }
  else
  {
    cs->writeisac(cs, IPACX_BCHB_TSDP_BC1, 0x80 | bc);
    cs->writeisac(cs, IPACX_BCHB_CR,       0x88); 
  }

	switch (mode) {
		case (L1_MODE_NULL):
		    cs->BC_Write_Reg(cs, hscx, IPACX_MODEB, 0xC0);  // rec off
		    cs->BC_Write_Reg(cs, hscx, IPACX_EXMB,  0x30);  // std adj.
		    cs->BC_Write_Reg(cs, hscx, IPACX_MASKB, 0xFF);  // ints off
		    cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x41);  // validate adjustments
		    break;
		case (L1_MODE_TRANS):
		    cs->BC_Write_Reg(cs, hscx, IPACX_MODEB, 0x88);  // ext transp mode
		    cs->BC_Write_Reg(cs, hscx, IPACX_EXMB,  0x00);  // xxx00000
		    cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x41);  // validate adjustments
		    cs->BC_Write_Reg(cs, hscx, IPACX_MASKB, _MASKB_IMASK);
		    break;
		case (L1_MODE_HDLC):
		    cs->BC_Write_Reg(cs, hscx, IPACX_MODEB, 0xC8);  // transp mode 0
		    cs->BC_Write_Reg(cs, hscx, IPACX_EXMB,  0x01);  // idle=hdlc flags crc enabled
		    cs->BC_Write_Reg(cs, hscx, IPACX_CMDRB, 0x41);  // validate adjustments
		    cs->BC_Write_Reg(cs, hscx, IPACX_MASKB, _MASKB_IMASK);
		    break;
	}
}

//----------------------------------------------------------
//----------------------------------------------------------
static void
bch_close_state(struct BCState *bcs)
{
	bch_mode(bcs, 0, bcs->channel);
	if (test_and_clear_bit(BC_FLG_INIT, &bcs->Flag)) {
		if (bcs->hw.hscx.rcvbuf) {
			kfree(bcs->hw.hscx.rcvbuf);
			bcs->hw.hscx.rcvbuf = NULL;
		}
		if (bcs->blog) {
			kfree(bcs->blog);
			bcs->blog = NULL;
		}
		skb_queue_purge(&bcs->rqueue);
		skb_queue_purge(&bcs->squeue);
		if (bcs->tx_skb) {
			dev_kfree_skb_any(bcs->tx_skb);
			bcs->tx_skb = NULL;
			clear_bit(BC_FLG_BUSY, &bcs->Flag);
		}
	}
}

//----------------------------------------------------------
//----------------------------------------------------------
static int
bch_open_state(struct IsdnCardState *cs, struct BCState *bcs)
{
	if (!test_and_set_bit(BC_FLG_INIT, &bcs->Flag)) {
		if (!(bcs->hw.hscx.rcvbuf = kmalloc(HSCX_BUFMAX, GFP_ATOMIC))) {
			printk(KERN_WARNING
				"HiSax open_bchstate(): No memory for hscx.rcvbuf\n");
			clear_bit(BC_FLG_INIT, &bcs->Flag);
			return (1);
		}
		if (!(bcs->blog = kmalloc(MAX_BLOG_SPACE, GFP_ATOMIC))) {
			printk(KERN_WARNING
				"HiSax open_bchstate: No memory for bcs->blog\n");
			clear_bit(BC_FLG_INIT, &bcs->Flag);
			kfree(bcs->hw.hscx.rcvbuf);
			bcs->hw.hscx.rcvbuf = NULL;
			return (2);
		}
		skb_queue_head_init(&bcs->rqueue);
		skb_queue_head_init(&bcs->squeue);
	}
	bcs->tx_skb = NULL;
	clear_bit(BC_FLG_BUSY, &bcs->Flag);
	bcs->event = 0;
	bcs->hw.hscx.rcvidx = 0;
	bcs->tx_cnt = 0;
	return (0);
}

//----------------------------------------------------------
//----------------------------------------------------------
static int
bch_setstack(struct PStack *st, struct BCState *bcs)
{
	bcs->channel = st->l1.bc;
	if (bch_open_state(st->l1.hardware, bcs)) return (-1);
	st->l1.bcs = bcs;
	st->l2.l2l1 = bch_l2l1;
	setstack_manager(st);
	bcs->st = st;
	setstack_l1_B(st);
	return (0);
}

//----------------------------------------------------------
//----------------------------------------------------------
static void __devinit
bch_init(struct IsdnCardState *cs, int hscx)
{
	cs->bcs[hscx].BC_SetStack   = bch_setstack;
	cs->bcs[hscx].BC_Close      = bch_close_state;
	cs->bcs[hscx].hw.hscx.hscx  = hscx;
	cs->bcs[hscx].cs            = cs;
	bch_mode(cs->bcs + hscx, 0, hscx);
}


//==========================================================
// Shared functions
//==========================================================

//----------------------------------------------------------
// Main interrupt handler
//----------------------------------------------------------
void 
interrupt_ipacx(struct IsdnCardState *cs)
{
	u_char ista;
  
	while ((ista = cs->readisac(cs, IPACX_ISTA))) {
//#################################################  
//		printk(KERN_WARNING "interrupt_ipacx(ista=%02x)\n", ista);
//#################################################  
    if (ista &0x80) bch_int(cs, 0); // B channel interrupts
    if (ista &0x40) bch_int(cs, 1);
    
    if (ista &0x01) dch_int(cs);    // D channel
    if (ista &0x10) cic_int(cs);    // Layer 1 state
  }  
}

//----------------------------------------------------------
// Clears chip interrupt status
//----------------------------------------------------------
static void __init
clear_pending_ints(struct IsdnCardState *cs)
{
	int ista;

  // all interrupts off
  cs->writeisac(cs, IPACX_MASK, 0xff);
	cs->writeisac(cs, IPACX_MASKD, 0xff);
	cs->BC_Write_Reg(cs, 0, IPACX_MASKB, 0xff);
	cs->BC_Write_Reg(cs, 1, IPACX_MASKB, 0xff);
  
  ista = cs->readisac(cs, IPACX_ISTA); 
  if (ista &0x80) cs->BC_Read_Reg(cs, 0, IPACX_ISTAB);
  if (ista &0x40) cs->BC_Read_Reg(cs, 1, IPACX_ISTAB);
  if (ista &0x10) cs->readisac(cs, IPACX_CIR0);
  if (ista &0x01) cs->readisac(cs, IPACX_ISTAD); 
}

//----------------------------------------------------------
// Does chip configuration work
// Work to do depends on bit mask in part
//----------------------------------------------------------
void __init
init_ipacx(struct IsdnCardState *cs, int part)
{
	if (part &1) {  // initialise chip
//##################################################  
//	printk(KERN_INFO "init_ipacx(%x)\n", part);
//##################################################  
		clear_pending_ints(cs);
		bch_init(cs, 0);
		bch_init(cs, 1);
		dch_init(cs);
	}
	if (part &2) {  // reenable all interrupts and start chip
		cs->BC_Write_Reg(cs, 0, IPACX_MASKB, _MASKB_IMASK);
		cs->BC_Write_Reg(cs, 1, IPACX_MASKB, _MASKB_IMASK);
		cs->writeisac(cs, IPACX_MASKD, _MASKD_IMASK);
		cs->writeisac(cs, IPACX_MASK, _MASK_IMASK); // global mask register

    // reset HDLC Transmitters/receivers
		cs->writeisac(cs, IPACX_CMDRD, 0x41); 
    cs->BC_Write_Reg(cs, 0, IPACX_CMDRB, 0x41);
    cs->BC_Write_Reg(cs, 1, IPACX_CMDRB, 0x41);
  	ph_command(cs, IPACX_CMD_RES);
	}
}

//----------------- end of file -----------------------