# hfc_2bs0.c

    /* $Id$

     *  specific routines for CCD's HFC 2BS0
     *
     * Author       Karsten Keil (keil@temic-ech.spacenet.de)
     *
     *
     * $Log$
     * Revision 1.5  1998/05/25 12:57:54  keil
     * HiSax golden code from certification, Don't use !!!
     * No leased lines, no X75, but many changes.
     *
     * Revision 1.4  1998/02/12 23:07:29  keil
     * change for 2.1.86 (removing FREE_READ/FREE_WRITE from [dev]_kfree_skb()
     *
     * Revision 1.3  1997/11/06 17:13:35  keil
     * New 2.1 init code
     *
     * Revision 1.2  1997/10/29 19:04:47  keil
     * changes for 2.1
     *
     * Revision 1.1  1997/09/11 17:31:33  keil
     * Common part for HFC 2BS0 based cards
     *
     *
     */

    #define __NO_VERSION__
    #include "hisax.h"
    #include "hfc_2bs0.h"
    #include "isac.h"
    #include "isdnl1.h"
    #include <linux/interrupt.h>

    static inline int
    WaitForBusy(struct IsdnCardState *cs)
    {
    	int to = 130;
    	long flags;
    	u_char val;

    	save_flags(flags);
    	cli();
    	while (!(cs->BC_Read_Reg(cs, HFC_STATUS, 0) & HFC_BUSY) && to) {
    		val = cs->BC_Read_Reg(cs, HFC_DATA, HFC_CIP | HFC_F2 |
    				      (cs->hw.hfc.cip & 3));
    		udelay(1);
    		to--;
    	}
    	restore_flags(flags);
    	if (!to) {
    		printk(KERN_WARNING "HiSax: waitforBusy timeout\n");
    		return (0);
    	} else
    		return (to);
    }

    static inline int
    WaitNoBusy(struct IsdnCardState *cs)
    {
    	int to = 125;

    	while ((cs->BC_Read_Reg(cs, HFC_STATUS, 0) & HFC_BUSY) && to) {
    		udelay(1);
    		to--;
    	}
    	if (!to) {
    		printk(KERN_WARNING "HiSax: waitforBusy timeout\n");
    		return (0);
    	} else
    		return (to);
    }

    int
    GetFreeFifoBytes(struct BCState *bcs)
    {
    	int s;

    	if (bcs->hw.hfc.f1 == bcs->hw.hfc.f2)
    		return (bcs->cs->hw.hfc.fifosize);
    	s = bcs->hw.hfc.send[bcs->hw.hfc.f1] - bcs->hw.hfc.send[bcs->hw.hfc.f2];
    	if (s <= 0)
    		s += bcs->cs->hw.hfc.fifosize;
    	s = bcs->cs->hw.hfc.fifosize - s;
    	return (s);
    }

    int
    ReadZReg(struct BCState *bcs, u_char reg)
    {
    	int val;

    	WaitNoBusy(bcs->cs);
    	val = 256 * bcs->cs->BC_Read_Reg(bcs->cs, HFC_DATA, reg | HFC_CIP | HFC_Z_HIGH);
    	WaitNoBusy(bcs->cs);
    	val += bcs->cs->BC_Read_Reg(bcs->cs, HFC_DATA, reg | HFC_CIP | HFC_Z_LOW);
    	return (val);
    }

    void
    hfc_sched_event(struct BCState *bcs, int event)
    {
    	bcs->event |= 1 << event;
    	queue_task(&bcs->tqueue, &tq_immediate);
    	mark_bh(IMMEDIATE_BH);
    }

    static void
    hfc_clear_fifo(struct BCState *bcs)
    {
    	struct IsdnCardState *cs = bcs->cs;
    	long flags;
    	int idx, cnt;
    	int rcnt, z1, z2;
    	u_char cip, f1, f2;
    	char tmp[64];

    	if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
    		debugl1(cs, "hfc_clear_fifo");
    	save_flags(flags);
    	cli();
    	cip = HFC_CIP | HFC_F1 | HFC_REC | HFC_CHANNEL(bcs->channel);
    	if ((cip & 0xc3) != (cs->hw.hfc.cip & 0xc3)) {
    		cs->BC_Write_Reg(cs, HFC_STATUS, cip, cip);
    		WaitForBusy(cs);
    	}
    	WaitNoBusy(cs);
    	f1 = cs->BC_Read_Reg(cs, HFC_DATA, cip);
    	cip = HFC_CIP | HFC_F2 | HFC_REC | HFC_CHANNEL(bcs->channel);
    	WaitNoBusy(cs);
    	f2 = cs->BC_Read_Reg(cs, HFC_DATA, cip);
    	z1 = ReadZReg(bcs, HFC_Z1 | HFC_REC | HFC_CHANNEL(bcs->channel));
    	z2 = ReadZReg(bcs, HFC_Z2 | HFC_REC | HFC_CHANNEL(bcs->channel));
    	cnt = 32;
    	while (((f1 != f2) || (z1 != z2)) && cnt--) {
    		if (cs->debug & L1_DEB_HSCX) {
    			sprintf(tmp, "hfc clear %d f1(%d) f2(%d)",
    				bcs->channel, f1, f2);
    			debugl1(cs, tmp);
    		}
    		rcnt = z1 - z2;
    		if (rcnt < 0)
    			rcnt += cs->hw.hfc.fifosize;
    		if (rcnt)
    			rcnt++;
    		if (cs->debug & L1_DEB_HSCX) {
    			sprintf(tmp, "hfc clear %d z1(%x) z2(%x) cnt(%d)",
    				bcs->channel, z1, z2, rcnt);
    			debugl1(cs, tmp);
    		}
    		cip = HFC_CIP | HFC_FIFO_OUT | HFC_REC | HFC_CHANNEL(bcs->channel);
    		idx = 0;
    		while ((idx < rcnt) && WaitNoBusy(cs)) {
    			cs->BC_Read_Reg(cs, HFC_DATA_NODEB, cip);
    			idx++;
    		}
    		if (f1 != f2) {
    			WaitNoBusy(cs);
    			cs->BC_Read_Reg(cs, HFC_DATA, HFC_CIP | HFC_F2_INC | HFC_REC |
    					HFC_CHANNEL(bcs->channel));
    			WaitForBusy(cs);
    		}
    		cip = HFC_CIP | HFC_F1 | HFC_REC | HFC_CHANNEL(bcs->channel);
    		WaitNoBusy(cs);
    		f1 = cs->BC_Read_Reg(cs, HFC_DATA, cip);
    		cip = HFC_CIP | HFC_F2 | HFC_REC | HFC_CHANNEL(bcs->channel);
    		WaitNoBusy(cs);
    		f2 = cs->BC_Read_Reg(cs, HFC_DATA, cip);
    		z1 = ReadZReg(bcs, HFC_Z1 | HFC_REC | HFC_CHANNEL(bcs->channel));
    		z2 = ReadZReg(bcs, HFC_Z2 | HFC_REC | HFC_CHANNEL(bcs->channel));
    	}
    	restore_flags(flags);
    	return;
    }

    static struct sk_buff
    *
    hfc_empty_fifo(struct BCState *bcs, int count)
    {
    	u_char *ptr;
    	struct sk_buff *skb;
    	struct IsdnCardState *cs = bcs->cs;
    	int idx;
    	int chksum;
    	u_char stat, cip;
    	char tmp[64];

    	if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
    		debugl1(cs, "hfc_empty_fifo");
    	idx = 0;
    	if (count > HSCX_BUFMAX + 3) {
    		if (cs->debug & L1_DEB_WARN)
    			debugl1(cs, "hfc_empty_fifo: incoming packet too large");
    		cip = HFC_CIP | HFC_FIFO_OUT | HFC_REC | HFC_CHANNEL(bcs->channel);
    		while ((idx++ < count) && WaitNoBusy(cs))
    			cs->BC_Read_Reg(cs, HFC_DATA_NODEB, cip);
    		WaitNoBusy(cs);
    		stat = cs->BC_Read_Reg(cs, HFC_DATA, HFC_CIP | HFC_F2_INC | HFC_REC |
    				       HFC_CHANNEL(bcs->channel));
    		WaitForBusy(cs);
    		return (NULL);
    	}
    	if (count < 4) {
    		if (cs->debug & L1_DEB_WARN)
    			debugl1(cs, "hfc_empty_fifo: incoming packet too small");
    		cip = HFC_CIP | HFC_FIFO_OUT | HFC_REC | HFC_CHANNEL(bcs->channel);
    		while ((idx++ < count) && WaitNoBusy(cs))
    			cs->BC_Read_Reg(cs, HFC_DATA_NODEB, cip);
    		WaitNoBusy(cs);
    		stat = cs->BC_Read_Reg(cs, HFC_DATA, HFC_CIP | HFC_F2_INC | HFC_REC |
    				       HFC_CHANNEL(bcs->channel));
    		WaitForBusy(cs);
    		return (NULL);
    	}
    	if (!(skb = dev_alloc_skb(count - 3)))
    		printk(KERN_WARNING "HFC: receive out of memory\n");
    	else {
    		ptr = skb_put(skb, count - 3);
    		idx = 0;
    		cip = HFC_CIP | HFC_FIFO_OUT | HFC_REC | HFC_CHANNEL(bcs->channel);
    		while ((idx < count - 3) && WaitNoBusy(cs)) {
    			*ptr++ = cs->BC_Read_Reg(cs, HFC_DATA_NODEB, cip);
    			idx++;
    		}
    		if (idx != count - 3) {
    			debugl1(cs, "RFIFO BUSY error");
    			printk(KERN_WARNING "HFC FIFO channel %d BUSY Error\n", bcs->channel);
    			dev_kfree_skb(skb);
    			WaitNoBusy(cs);
    			stat = cs->BC_Read_Reg(cs, HFC_DATA, HFC_CIP | HFC_F2_INC | HFC_REC |
    					       HFC_CHANNEL(bcs->channel));
    			WaitForBusy(cs);
    			return (NULL);
    		}
    		WaitNoBusy(cs);
    		chksum = (cs->BC_Read_Reg(cs, HFC_DATA, cip) << 8);
    		WaitNoBusy(cs);
    		chksum += cs->BC_Read_Reg(cs, HFC_DATA, cip);
    		WaitNoBusy(cs);
    		stat = cs->BC_Read_Reg(cs, HFC_DATA, cip);
    		if (cs->debug & L1_DEB_HSCX) {
    			sprintf(tmp, "hfc_empty_fifo %d chksum %x stat %x",
    				bcs->channel, chksum, stat);
    			debugl1(cs, tmp);
    		}
    		if (stat) {
    			debugl1(cs, "FIFO CRC error");
    			dev_kfree_skb(skb);
    			skb = NULL;
    		}
    		WaitNoBusy(cs);
    		stat = cs->BC_Read_Reg(cs, HFC_DATA, HFC_CIP | HFC_F2_INC | HFC_REC |
    				       HFC_CHANNEL(bcs->channel));
    		WaitForBusy(cs);
    	}
    	return (skb);
    }

    static void
    hfc_fill_fifo(struct BCState *bcs)
    {
    	struct IsdnCardState *cs = bcs->cs;
    	long flags;
    	int idx, fcnt;
    	int count;
    	u_char cip;
    	char tmp[64];

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

    	save_flags(flags);
    	cli();
    	cip = HFC_CIP | HFC_F1 | HFC_SEND | HFC_CHANNEL(bcs->channel);
    	if ((cip & 0xc3) != (cs->hw.hfc.cip & 0xc3)) {
    		cs->BC_Write_Reg(cs, HFC_STATUS, cip, cip);
    		WaitForBusy(cs);
    	}
    	WaitNoBusy(cs);
    	bcs->hw.hfc.f1 = cs->BC_Read_Reg(cs, HFC_DATA, cip);
    	cip = HFC_CIP | HFC_F2 | HFC_SEND | HFC_CHANNEL(bcs->channel);
    	WaitNoBusy(cs);
    	bcs->hw.hfc.f2 = cs->BC_Read_Reg(cs, HFC_DATA, cip);
    	bcs->hw.hfc.send[bcs->hw.hfc.f1] = ReadZReg(bcs, HFC_Z1 | HFC_SEND | HFC_CHANNEL(bcs->channel));
    	if (cs->debug & L1_DEB_HSCX) {
    		sprintf(tmp, "hfc_fill_fifo %d f1(%d) f2(%d) z1(%x)",
    			bcs->channel, bcs->hw.hfc.f1, bcs->hw.hfc.f2,
    			bcs->hw.hfc.send[bcs->hw.hfc.f1]);
    		debugl1(cs, tmp);
    	}
    	fcnt = bcs->hw.hfc.f1 - bcs->hw.hfc.f2;
    	if (fcnt < 0)
    		fcnt += 32;
    	if (fcnt > 30) {
    		if (cs->debug & L1_DEB_HSCX)
    			debugl1(cs, "hfc_fill_fifo more as 30 frames");
    		restore_flags(flags);
    		return;
    	}
    	count = GetFreeFifoBytes(bcs);
    	if (cs->debug & L1_DEB_HSCX) {
    		sprintf(tmp, "hfc_fill_fifo %d count(%d/%d)",
    			bcs->channel, bcs->hw.hfc.tx_skb->len,
    			count);
    		debugl1(cs, tmp);
    	}
    	if (count < bcs->hw.hfc.tx_skb->len) {
    		if (cs->debug & L1_DEB_HSCX)
    			debugl1(cs, "hfc_fill_fifo no fifo mem");
    		restore_flags(flags);
    		return;
    	}
    	cip = HFC_CIP | HFC_FIFO_IN | HFC_SEND | HFC_CHANNEL(bcs->channel);
    	idx = 0;
    	while ((idx < bcs->hw.hfc.tx_skb->len) && WaitNoBusy(cs))
    		cs->BC_Write_Reg(cs, HFC_DATA_NODEB, cip, bcs->hw.hfc.tx_skb->data[idx++]);
    	if (idx != bcs->hw.hfc.tx_skb->len) {
    		debugl1(cs, "FIFO Send BUSY error");
    		printk(KERN_WARNING "HFC S FIFO channel %d BUSY Error\n", bcs->channel);
    	} else {
    		count =  bcs->hw.hfc.tx_skb->len;
    		bcs->tx_cnt -= count;
    		if (PACKET_NOACK == bcs->hw.hfc.tx_skb->pkt_type)
    			count = -1;
    		dev_kfree_skb(bcs->hw.hfc.tx_skb);
    		bcs->hw.hfc.tx_skb = NULL;
    		WaitForBusy(cs);
    		WaitNoBusy(cs);
    		cs->BC_Read_Reg(cs, HFC_DATA, HFC_CIP | HFC_F1_INC | HFC_SEND | HFC_CHANNEL(bcs->channel));
    		if (bcs->st->lli.l1writewakeup && (count >= 0))
    			bcs->st->lli.l1writewakeup(bcs->st, count);
    		test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
    	}
    	restore_flags(flags);
    	return;
    }

    void
    main_irq_hfc(struct BCState *bcs)
    {
    	long flags;
    	struct IsdnCardState *cs = bcs->cs;
    	int z1, z2, rcnt;
    	u_char f1, f2, cip;
    	int receive, transmit, count = 5;
    	struct sk_buff *skb;
    	char tmp[64];

    	save_flags(flags);
          Begin:
    	cli();
    	count--;
    	cip = HFC_CIP | HFC_F1 | HFC_REC | HFC_CHANNEL(bcs->channel);
    	if ((cip & 0xc3) != (cs->hw.hfc.cip & 0xc3)) {
    		cs->BC_Write_Reg(cs, HFC_STATUS, cip, cip);
    		WaitForBusy(cs);
    	}
    	WaitNoBusy(cs);
    	f1 = cs->BC_Read_Reg(cs, HFC_DATA, cip);
    	cip = HFC_CIP | HFC_F2 | HFC_REC | HFC_CHANNEL(bcs->channel);
    	WaitNoBusy(cs);
    	f2 = cs->BC_Read_Reg(cs, HFC_DATA, cip);
    	if (f1 != f2) {
    		if (cs->debug & L1_DEB_HSCX) {
    			sprintf(tmp, "hfc rec %d f1(%d) f2(%d)",
    				bcs->channel, f1, f2);
    			debugl1(cs, tmp);
    		}
    		WaitForBusy(cs);
    		z1 = ReadZReg(bcs, HFC_Z1 | HFC_REC | HFC_CHANNEL(bcs->channel));
    		z2 = ReadZReg(bcs, HFC_Z2 | HFC_REC | HFC_CHANNEL(bcs->channel));
    		rcnt = z1 - z2;
    		if (rcnt < 0)
    			rcnt += cs->hw.hfc.fifosize;
    		rcnt++;
    		if (cs->debug & L1_DEB_HSCX) {
    			sprintf(tmp, "hfc rec %d z1(%x) z2(%x) cnt(%d)",
    				bcs->channel, z1, z2, rcnt);
    			debugl1(cs, tmp);
    		}
    /*              sti(); */
    		if ((skb = hfc_empty_fifo(bcs, rcnt))) {
    			skb_queue_tail(&bcs->rqueue, skb);
    			hfc_sched_event(bcs, B_RCVBUFREADY);
    		}
    		receive = 1;
    	} else
    		receive = 0;
    	restore_flags(flags);
    	udelay(1);
    	cli();
    	if (bcs->hw.hfc.tx_skb) {
    		transmit = 1;
    		test_and_set_bit(BC_FLG_BUSY, &bcs->Flag);
    		hfc_fill_fifo(bcs);
    		if (test_bit(BC_FLG_BUSY, &bcs->Flag))
    			transmit = 0;
    	} else {
    		if ((bcs->hw.hfc.tx_skb = skb_dequeue(&bcs->squeue))) {
    			transmit = 1;
    			test_and_set_bit(BC_FLG_BUSY, &bcs->Flag);
    			hfc_fill_fifo(bcs);
    			if (test_bit(BC_FLG_BUSY, &bcs->Flag))
    				transmit = 0;
    		} else {
    			transmit = 0;
    			hfc_sched_event(bcs, B_XMTBUFREADY);
    		}
    	}
    	restore_flags(flags);
    	if ((receive || transmit) && count)
    		goto Begin;
    	return;
    }

    void
    mode_hfc(struct BCState *bcs, int mode, int bc)
    {
    	struct IsdnCardState *cs = bcs->cs;

    	if (cs->debug & L1_DEB_HSCX) {
    		char tmp[40];
    		sprintf(tmp, "HFC 2BS0 mode %d bchan %d/%d",
    			mode, bc, bcs->channel);
    		debugl1(cs, tmp);
    	}
    	bcs->mode = mode;

    	switch (mode) {
    		case (L1_MODE_NULL):
    			if (bc)
    				cs->hw.hfc.isac_spcr &= ~0x03;
    			else
    				cs->hw.hfc.isac_spcr &= ~0x0c;
    			break;
    		case (L1_MODE_TRANS):
    			if (bc) {
    				cs->hw.hfc.ctmt |= 1;
    				cs->hw.hfc.isac_spcr &= ~0x03;
    				cs->hw.hfc.isac_spcr |= 0x02;
    			} else {
    				cs->hw.hfc.ctmt |= 2;
    				cs->hw.hfc.isac_spcr &= ~0x0c;
    				cs->hw.hfc.isac_spcr |= 0x08;
    			}
    			break;
    		case (L1_MODE_HDLC):
    			if (bc) {
    				cs->hw.hfc.ctmt &= ~1;
    				cs->hw.hfc.isac_spcr &= ~0x03;
    				cs->hw.hfc.isac_spcr |= 0x02;
    			} else {
    				cs->hw.hfc.ctmt &= ~2;
    				cs->hw.hfc.isac_spcr &= ~0x0c;
    				cs->hw.hfc.isac_spcr |= 0x08;
    			}
    			break;
    	}
    	cs->BC_Write_Reg(cs, HFC_STATUS, cs->hw.hfc.ctmt, cs->hw.hfc.ctmt);
    	cs->writeisac(cs, ISAC_SPCR, cs->hw.hfc.isac_spcr);
    	if (mode)
    		hfc_clear_fifo(bcs);
    }

    static void
    hfc_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->hw.hfc.tx_skb) {
    				skb_queue_tail(&st->l1.bcs->squeue, skb);
    				restore_flags(flags);
    			} else {
    				st->l1.bcs->hw.hfc.tx_skb = skb;
    				test_and_set_bit(BC_FLG_BUSY, &st->l1.bcs->Flag);
    				st->l1.bcs->cs->BC_Send_Data(st->l1.bcs);
    				restore_flags(flags);
    			}
    			break;
    		case (PH_PULL | INDICATION):
    			if (st->l1.bcs->hw.hfc.tx_skb) {
    				printk(KERN_WARNING "hfc_l2l1: this shouldn't happen\n");
    				break;
    			}
    			save_flags(flags);
    			cli();
    			test_and_set_bit(BC_FLG_BUSY, &st->l1.bcs->Flag);
    			st->l1.bcs->hw.hfc.tx_skb = skb;
    			st->l1.bcs->cs->BC_Send_Data(st->l1.bcs);
    			restore_flags(flags);
    			break;
    		case (PH_PULL | REQUEST):
    			if (!st->l1.bcs->hw.hfc.tx_skb) {
    				test_and_clear_bit(FLG_L1_PULL_REQ, &st->l1.Flags);
    				st->l1.l1l2(st, PH_PULL | CONFIRM, NULL);
    			} else
    				test_and_set_bit(FLG_L1_PULL_REQ, &st->l1.Flags);
    			break;
    		case (PH_ACTIVATE | REQUEST):
    			test_and_set_bit(BC_FLG_ACTIV, &st->l1.bcs->Flag);
    			mode_hfc(st->l1.bcs, st->l1.mode, st->l1.bc);
    			st->l1.l1l2(st, PH_ACTIVATE | CONFIRM, NULL);
    			break;
    		case (PH_DEACTIVATE | REQUEST):
    			if (!test_bit(BC_FLG_BUSY, &st->l1.bcs->Flag))
    				mode_hfc(st->l1.bcs, 0, 0);
    			test_and_clear_bit(BC_FLG_ACTIV, &st->l1.bcs->Flag);
    			break;
    	}
    }

    void
    close_hfcstate(struct BCState *bcs)
    {
    	mode_hfc(bcs, 0, 0);
    	if (test_bit(BC_FLG_INIT, &bcs->Flag)) {
    		discard_queue(&bcs->rqueue);
    		discard_queue(&bcs->squeue);
    		if (bcs->hw.hfc.tx_skb) {
    			dev_kfree_skb(bcs->hw.hfc.tx_skb);
    			bcs->hw.hfc.tx_skb = NULL;
    			test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
    		}
    	}
    	test_and_clear_bit(BC_FLG_INIT, &bcs->Flag);
    }

    static int
    open_hfcstate(struct IsdnCardState *cs,
    	      int bc)
    {
    	struct BCState *bcs = cs->bcs + bc;

    	if (!test_and_set_bit(BC_FLG_INIT, &bcs->Flag)) {
    		skb_queue_head_init(&bcs->rqueue);
    		skb_queue_head_init(&bcs->squeue);
    	}
    	bcs->hw.hfc.tx_skb = NULL;
    	test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
    	bcs->event = 0;
    	bcs->tx_cnt = 0;
    	return (0);
    }

    int
    setstack_hfc(struct PStack *st, struct BCState *bcs)
    {
    	if (open_hfcstate(st->l1.hardware, bcs->channel))
    		return (-1);
    	st->l1.bcs = bcs;
    	st->l2.l2l1 = hfc_l2l1;
    	setstack_manager(st);
    	bcs->st = st;
    	return (0);
    }

    __initfunc(void
    init_send(struct BCState *bcs))
    {
    	int i;

    	if (!(bcs->hw.hfc.send = kmalloc(32 * sizeof(unsigned int), GFP_ATOMIC))) {
    		printk(KERN_WARNING
    		       "HiSax: No memory for hfc.send\n");
    		return;
    	}
    	for (i = 0; i < 32; i++)
    		bcs->hw.hfc.send[i] = 0x1fff;
    }

    __initfunc(void
    inithfc(struct IsdnCardState *cs))
    {
    	init_send(&cs->bcs[0]);
    	init_send(&cs->bcs[1]);
    	cs->BC_Send_Data = &hfc_fill_fifo;
    	cs->bcs[0].BC_SetStack = setstack_hfc;
    	cs->bcs[1].BC_SetStack = setstack_hfc;
    	cs->bcs[0].BC_Close = close_hfcstate;
    	cs->bcs[1].BC_Close = close_hfcstate;
    	mode_hfc(cs->bcs, 0, 0);
    	mode_hfc(cs->bcs + 1, 0, 0);
    }

    void
    releasehfc(struct IsdnCardState *cs)
    {
    	if (cs->bcs[0].hw.hfc.send) {
    		kfree(cs->bcs[0].hw.hfc.send);
    		cs->bcs[0].hw.hfc.send = NULL;
    	}
    	if (cs->bcs[1].hw.hfc.send) {
    		kfree(cs->bcs[1].hw.hfc.send);
    		cs->bcs[1].hw.hfc.send = NULL;
    	}
    }