drivers/isdn/hisax/hfc_2bs0.c - maze/linux - Git at Google

 /* $Id: hfc_2bs0.c,v 1.20.2.6 2004/02/11 13:21:33 keil Exp $
  *
  * specific routines for CCD's HFC 2BS0
  *
  * Author       Karsten Keil
  * Copyright    by Karsten Keil      <keil@isdn4linux.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 "hfc_2bs0.h"
 #include "isac.h"
 #include "isdnl1.h"
 #include <linux/interrupt.h>
 #include <linux/slab.h>

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

 	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--;
 	}
 	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);
 }

 static 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);
 }

 static 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);
 }

 static void
 hfc_clear_fifo(struct BCState *bcs)
 {
 	struct IsdnCardState *cs = bcs->cs;
 	int idx, cnt;
 	int rcnt, z1, z2;
 	u_char cip, f1, f2;

 	if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
 		debugl1(cs, "hfc_clear_fifo");
 	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)
 			debugl1(cs, "hfc clear %d f1(%d) f2(%d)",
 				bcs->channel, f1, f2);
 		rcnt = z1 - z2;
 		if (rcnt < 0)
 			rcnt += cs->hw.hfc.fifosize;
 		if (rcnt)
 			rcnt++;
 		if (cs->debug & L1_DEB_HSCX)
 			debugl1(cs, "hfc clear %d z1(%x) z2(%x) cnt(%d)",
 				bcs->channel, z1, z2, rcnt);
 		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));
 	}
 	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;

 	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) && (bcs->mode != L1_MODE_TRANS)) {
 		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);
 #ifdef ERROR_STATISTIC
 		bcs->err_inv++;
 #endif
 		return (NULL);
 	}
 	if (bcs->mode == L1_MODE_TRANS)
 		count -= 1;
 	else
 		count -= 3;
 	if (!(skb = dev_alloc_skb(count)))
 		printk(KERN_WARNING "HFC: receive out of memory\n");
 	else {
 		ptr = skb_put(skb, count);
 		idx = 0;
 		cip = HFC_CIP | HFC_FIFO_OUT | HFC_REC | HFC_CHANNEL(bcs->channel);
 		while ((idx < count) && WaitNoBusy(cs)) {
 			*ptr++ = cs->BC_Read_Reg(cs, HFC_DATA_NODEB, cip);
 			idx++;
 		}
 		if (idx != count) {
 			debugl1(cs, "RFIFO BUSY error");
 			printk(KERN_WARNING "HFC FIFO channel %d BUSY Error\n", bcs->channel);
 			dev_kfree_skb_any(skb);
 			if (bcs->mode != L1_MODE_TRANS) {
 				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 (bcs->mode != L1_MODE_TRANS) {
 			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)
 				debugl1(cs, "hfc_empty_fifo %d chksum %x stat %x",
 					bcs->channel, chksum, stat);
 			if (stat) {
 				debugl1(cs, "FIFO CRC error");
 				dev_kfree_skb_any(skb);
 				skb = NULL;
 #ifdef ERROR_STATISTIC
 				bcs->err_crc++;
 #endif
 			}
 			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;
 	int idx, fcnt;
 	int count;
 	int z1, z2;
 	u_char cip;

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

 	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);
 	if (bcs->mode != L1_MODE_TRANS) {
 		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)
 			debugl1(cs, "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]);
 		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");
 			return;
 		}
 		count = GetFreeFifoBytes(bcs);
 	}
 	else {
 		WaitForBusy(cs);
 		z1 = ReadZReg(bcs, HFC_Z1 | HFC_REC | HFC_CHANNEL(bcs->channel));
 		z2 = ReadZReg(bcs, HFC_Z2 | HFC_REC | HFC_CHANNEL(bcs->channel));
 		count = z1 - z2;
 		if (count < 0)
 			count += cs->hw.hfc.fifosize;
 	} /* L1_MODE_TRANS */
 	if (cs->debug & L1_DEB_HSCX)
 		debugl1(cs, "hfc_fill_fifo %d count(%u/%d)",
 			bcs->channel, bcs->tx_skb->len,
 			count);
 	if (count < bcs->tx_skb->len) {
 		if (cs->debug & L1_DEB_HSCX)
 			debugl1(cs, "hfc_fill_fifo no fifo mem");
 		return;
 	}
 	cip = HFC_CIP | HFC_FIFO_IN | HFC_SEND | HFC_CHANNEL(bcs->channel);
 	idx = 0;
 	while ((idx < bcs->tx_skb->len) && WaitNoBusy(cs))
 		cs->BC_Write_Reg(cs, HFC_DATA_NODEB, cip, bcs->tx_skb->data[idx++]);
 	if (idx != bcs->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->tx_skb->len;
 		bcs->tx_cnt -= count;
 		if (PACKET_NOACK == bcs->tx_skb->pkt_type)
 			count = -1;
 		dev_kfree_skb_any(bcs->tx_skb);
 		bcs->tx_skb = NULL;
 		if (bcs->mode != L1_MODE_TRANS) {
 			WaitForBusy(cs);
 			WaitNoBusy(cs);
 			cs->BC_Read_Reg(cs, HFC_DATA, HFC_CIP | HFC_F1_INC | HFC_SEND | HFC_CHANNEL(bcs->channel));
 		}
 		if (test_bit(FLG_LLI_L1WAKEUP, &bcs->st->lli.flag) &&
 		    (count >= 0)) {
 			u_long	flags;
 			spin_lock_irqsave(&bcs->aclock, flags);
 			bcs->ackcnt += count;
 			spin_unlock_irqrestore(&bcs->aclock, flags);
 			schedule_event(bcs, B_ACKPENDING);
 		}
 		test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
 	}
 	return;
 }

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

 Begin:
 	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);
 	receive = 0;
 	if (bcs->mode == L1_MODE_HDLC) {
 		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)
 				debugl1(cs, "hfc rec %d f1(%d) f2(%d)",
 					bcs->channel, f1, f2);
 			receive = 1;
 		}
 	}
 	if (receive || (bcs->mode == L1_MODE_TRANS)) {
 		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;
 		if ((bcs->mode == L1_MODE_HDLC) || (rcnt)) {
 			rcnt++;
 			if (cs->debug & L1_DEB_HSCX)
 				debugl1(cs, "hfc rec %d z1(%x) z2(%x) cnt(%d)",
 					bcs->channel, z1, z2, rcnt);
 			/*              sti(); */
 			if ((skb = hfc_empty_fifo(bcs, rcnt))) {
 				skb_queue_tail(&bcs->rqueue, skb);
 				schedule_event(bcs, B_RCVBUFREADY);
 			}
 		}
 		receive = 1;
 	}
 	if (bcs->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->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;
 			schedule_event(bcs, B_XMTBUFREADY);
 		}
 	}
 	if ((receive || transmit) && count)
 		goto Begin;
 	return;
 }

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

 	if (cs->debug & L1_DEB_HSCX)
 		debugl1(cs, "HFC 2BS0 mode %d bchan %d/%d",
 			mode, bc, bcs->channel);
 	bcs->mode = mode;
 	bcs->channel = bc;

 	switch (mode) {
 	case (L1_MODE_NULL):
 		if (bc) {
 			cs->hw.hfc.ctmt &= ~1;
 			cs->hw.hfc.isac_spcr &= ~0x03;
 		}
 		else {
 			cs->hw.hfc.ctmt &= ~2;
 			cs->hw.hfc.isac_spcr &= ~0x0c;
 		}
 		break;
 	case (L1_MODE_TRANS):
 		cs->hw.hfc.ctmt &= ~(1 << bc); /* set HDLC mode */
 		cs->BC_Write_Reg(cs, HFC_STATUS, cs->hw.hfc.ctmt, cs->hw.hfc.ctmt);
 		hfc_clear_fifo(bcs); /* complete fifo clear */
 		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 == L1_MODE_HDLC)
 		hfc_clear_fifo(bcs);
 }

 static void
 hfc_l2l1(struct PStack *st, int pr, void *arg)
 {
 	struct BCState	*bcs = st->l1.bcs;
 	struct sk_buff	*skb = arg;
 	u_long		flags;

 	switch (pr) {
 	case (PH_DATA | REQUEST):
 		spin_lock_irqsave(&bcs->cs->lock, flags);
 		if (bcs->tx_skb) {
 			skb_queue_tail(&bcs->squeue, skb);
 		} else {
 			bcs->tx_skb = skb;
 			test_and_set_bit(BC_FLG_BUSY, &bcs->Flag);
 			bcs->cs->BC_Send_Data(bcs);
 		}
 		spin_unlock_irqrestore(&bcs->cs->lock, flags);
 		break;
 	case (PH_PULL | INDICATION):
 		spin_lock_irqsave(&bcs->cs->lock, flags);
 		if (bcs->tx_skb) {
 			printk(KERN_WARNING "hfc_l2l1: this shouldn't happen\n");
 		} else {
 			test_and_set_bit(BC_FLG_BUSY, &bcs->Flag);
 			bcs->tx_skb = skb;
 			bcs->cs->BC_Send_Data(bcs);
 		}
 		spin_unlock_irqrestore(&bcs->cs->lock, flags);
 		break;
 	case (PH_PULL | REQUEST):
 		if (!bcs->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):
 		spin_lock_irqsave(&bcs->cs->lock, flags);
 		test_and_set_bit(BC_FLG_ACTIV, &bcs->Flag);
 		mode_hfc(bcs, st->l1.mode, st->l1.bc);
 		spin_unlock_irqrestore(&bcs->cs->lock, flags);
 		l1_msg_b(st, pr, arg);
 		break;
 	case (PH_DEACTIVATE | REQUEST):
 		l1_msg_b(st, pr, arg);
 		break;
 	case (PH_DEACTIVATE | CONFIRM):
 		spin_lock_irqsave(&bcs->cs->lock, flags);
 		test_and_clear_bit(BC_FLG_ACTIV, &bcs->Flag);
 		test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
 		mode_hfc(bcs, 0, st->l1.bc);
 		spin_unlock_irqrestore(&bcs->cs->lock, flags);
 		st->l1.l1l2(st, PH_DEACTIVATE | CONFIRM, NULL);
 		break;
 	}
 }


 static void
 close_hfcstate(struct BCState *bcs)
 {
 	mode_hfc(bcs, 0, bcs->channel);
 	if (test_bit(BC_FLG_INIT, &bcs->Flag)) {
 		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;
 			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, struct BCState *bcs)
 {
 	if (!test_and_set_bit(BC_FLG_INIT, &bcs->Flag)) {
 		skb_queue_head_init(&bcs->rqueue);
 		skb_queue_head_init(&bcs->squeue);
 	}
 	bcs->tx_skb = NULL;
 	test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
 	bcs->event = 0;
 	bcs->tx_cnt = 0;
 	return (0);
 }

 static int
 setstack_hfc(struct PStack *st, struct BCState *bcs)
 {
 	bcs->channel = st->l1.bc;
 	if (open_hfcstate(st->l1.hardware, bcs))
 		return (-1);
 	st->l1.bcs = bcs;
 	st->l2.l2l1 = hfc_l2l1;
 	setstack_manager(st);
 	bcs->st = st;
 	setstack_l1_B(st);
 	return (0);
 }

 static 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;
 }

 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)
 {
 	kfree(cs->bcs[0].hw.hfc.send);
 	cs->bcs[0].hw.hfc.send = NULL;
 	kfree(cs->bcs[1].hw.hfc.send);
 	cs->bcs[1].hw.hfc.send = NULL;
 }
	/* $Id: hfc_2bs0.c,v 1.20.2.6 2004/02/11 13:21:33 keil Exp $
	*
	* specific routines for CCD's HFC 2BS0
	*
	* Author Karsten Keil
	* Copyright by Karsten Keil <keil@isdn4linux.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 "hfc_2bs0.h"
	#include "isac.h"
	#include "isdnl1.h"
	#include <linux/interrupt.h>
	#include <linux/slab.h>

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

	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--;
	}
	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);
	}

	static 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);
	}

	static 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);
	}

	static void
	hfc_clear_fifo(struct BCState *bcs)
	{
	struct IsdnCardState *cs = bcs->cs;
	int idx, cnt;
	int rcnt, z1, z2;
	u_char cip, f1, f2;

	if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
	debugl1(cs, "hfc_clear_fifo");
	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)
	debugl1(cs, "hfc clear %d f1(%d) f2(%d)",
	bcs->channel, f1, f2);
	rcnt = z1 - z2;
	if (rcnt < 0)
	rcnt += cs->hw.hfc.fifosize;
	if (rcnt)
	rcnt++;
	if (cs->debug & L1_DEB_HSCX)
	debugl1(cs, "hfc clear %d z1(%x) z2(%x) cnt(%d)",
	bcs->channel, z1, z2, rcnt);
	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));
	}
	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;

	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) && (bcs->mode != L1_MODE_TRANS)) {
	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);
	#ifdef ERROR_STATISTIC
	bcs->err_inv++;
	#endif
	return (NULL);
	}
	if (bcs->mode == L1_MODE_TRANS)
	count -= 1;
	else
	count -= 3;
	if (!(skb = dev_alloc_skb(count)))
	printk(KERN_WARNING "HFC: receive out of memory\n");
	else {
	ptr = skb_put(skb, count);
	idx = 0;
	cip = HFC_CIP \| HFC_FIFO_OUT \| HFC_REC \| HFC_CHANNEL(bcs->channel);
	while ((idx < count) && WaitNoBusy(cs)) {
	*ptr++ = cs->BC_Read_Reg(cs, HFC_DATA_NODEB, cip);
	idx++;
	}
	if (idx != count) {
	debugl1(cs, "RFIFO BUSY error");
	printk(KERN_WARNING "HFC FIFO channel %d BUSY Error\n", bcs->channel);
	dev_kfree_skb_any(skb);
	if (bcs->mode != L1_MODE_TRANS) {
	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 (bcs->mode != L1_MODE_TRANS) {
	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)
	debugl1(cs, "hfc_empty_fifo %d chksum %x stat %x",
	bcs->channel, chksum, stat);
	if (stat) {
	debugl1(cs, "FIFO CRC error");
	dev_kfree_skb_any(skb);
	skb = NULL;
	#ifdef ERROR_STATISTIC
	bcs->err_crc++;
	#endif
	}
	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;
	int idx, fcnt;
	int count;
	int z1, z2;
	u_char cip;

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

	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);
	if (bcs->mode != L1_MODE_TRANS) {
	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)
	debugl1(cs, "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]);
	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");
	return;
	}
	count = GetFreeFifoBytes(bcs);
	}
	else {
	WaitForBusy(cs);
	z1 = ReadZReg(bcs, HFC_Z1 \| HFC_REC \| HFC_CHANNEL(bcs->channel));
	z2 = ReadZReg(bcs, HFC_Z2 \| HFC_REC \| HFC_CHANNEL(bcs->channel));
	count = z1 - z2;
	if (count < 0)
	count += cs->hw.hfc.fifosize;
	} /* L1_MODE_TRANS */
	if (cs->debug & L1_DEB_HSCX)
	debugl1(cs, "hfc_fill_fifo %d count(%u/%d)",
	bcs->channel, bcs->tx_skb->len,
	count);
	if (count < bcs->tx_skb->len) {
	if (cs->debug & L1_DEB_HSCX)
	debugl1(cs, "hfc_fill_fifo no fifo mem");
	return;
	}
	cip = HFC_CIP \| HFC_FIFO_IN \| HFC_SEND \| HFC_CHANNEL(bcs->channel);
	idx = 0;
	while ((idx < bcs->tx_skb->len) && WaitNoBusy(cs))
	cs->BC_Write_Reg(cs, HFC_DATA_NODEB, cip, bcs->tx_skb->data[idx++]);
	if (idx != bcs->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->tx_skb->len;
	bcs->tx_cnt -= count;
	if (PACKET_NOACK == bcs->tx_skb->pkt_type)
	count = -1;
	dev_kfree_skb_any(bcs->tx_skb);
	bcs->tx_skb = NULL;
	if (bcs->mode != L1_MODE_TRANS) {
	WaitForBusy(cs);
	WaitNoBusy(cs);
	cs->BC_Read_Reg(cs, HFC_DATA, HFC_CIP \| HFC_F1_INC \| HFC_SEND \| HFC_CHANNEL(bcs->channel));
	}
	if (test_bit(FLG_LLI_L1WAKEUP, &bcs->st->lli.flag) &&
	(count >= 0)) {
	u_long flags;
	spin_lock_irqsave(&bcs->aclock, flags);
	bcs->ackcnt += count;
	spin_unlock_irqrestore(&bcs->aclock, flags);
	schedule_event(bcs, B_ACKPENDING);
	}
	test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
	}
	return;
	}

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

	Begin:
	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);
	receive = 0;
	if (bcs->mode == L1_MODE_HDLC) {
	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)
	debugl1(cs, "hfc rec %d f1(%d) f2(%d)",
	bcs->channel, f1, f2);
	receive = 1;
	}
	}
	if (receive \|\| (bcs->mode == L1_MODE_TRANS)) {
	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;
	if ((bcs->mode == L1_MODE_HDLC) \|\| (rcnt)) {
	rcnt++;
	if (cs->debug & L1_DEB_HSCX)
	debugl1(cs, "hfc rec %d z1(%x) z2(%x) cnt(%d)",
	bcs->channel, z1, z2, rcnt);
	/* sti(); */
	if ((skb = hfc_empty_fifo(bcs, rcnt))) {
	skb_queue_tail(&bcs->rqueue, skb);
	schedule_event(bcs, B_RCVBUFREADY);
	}
	}
	receive = 1;
	}
	if (bcs->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->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;
	schedule_event(bcs, B_XMTBUFREADY);
	}
	}
	if ((receive \|\| transmit) && count)
	goto Begin;
	return;
	}

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

	if (cs->debug & L1_DEB_HSCX)
	debugl1(cs, "HFC 2BS0 mode %d bchan %d/%d",
	mode, bc, bcs->channel);
	bcs->mode = mode;
	bcs->channel = bc;

	switch (mode) {
	case (L1_MODE_NULL):
	if (bc) {
	cs->hw.hfc.ctmt &= ~1;
	cs->hw.hfc.isac_spcr &= ~0x03;
	}
	else {
	cs->hw.hfc.ctmt &= ~2;
	cs->hw.hfc.isac_spcr &= ~0x0c;
	}
	break;
	case (L1_MODE_TRANS):
	cs->hw.hfc.ctmt &= ~(1 << bc); /* set HDLC mode */
	cs->BC_Write_Reg(cs, HFC_STATUS, cs->hw.hfc.ctmt, cs->hw.hfc.ctmt);
	hfc_clear_fifo(bcs); /* complete fifo clear */
	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 == L1_MODE_HDLC)
	hfc_clear_fifo(bcs);
	}

	static void
	hfc_l2l1(struct PStack st, int pr, void arg)
	{
	struct BCState *bcs = st->l1.bcs;
	struct sk_buff *skb = arg;
	u_long flags;

	switch (pr) {
	case (PH_DATA \| REQUEST):
	spin_lock_irqsave(&bcs->cs->lock, flags);
	if (bcs->tx_skb) {
	skb_queue_tail(&bcs->squeue, skb);
	} else {
	bcs->tx_skb = skb;
	test_and_set_bit(BC_FLG_BUSY, &bcs->Flag);
	bcs->cs->BC_Send_Data(bcs);
	}
	spin_unlock_irqrestore(&bcs->cs->lock, flags);
	break;
	case (PH_PULL \| INDICATION):
	spin_lock_irqsave(&bcs->cs->lock, flags);
	if (bcs->tx_skb) {
	printk(KERN_WARNING "hfc_l2l1: this shouldn't happen\n");
	} else {
	test_and_set_bit(BC_FLG_BUSY, &bcs->Flag);
	bcs->tx_skb = skb;
	bcs->cs->BC_Send_Data(bcs);
	}
	spin_unlock_irqrestore(&bcs->cs->lock, flags);
	break;
	case (PH_PULL \| REQUEST):
	if (!bcs->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):
	spin_lock_irqsave(&bcs->cs->lock, flags);
	test_and_set_bit(BC_FLG_ACTIV, &bcs->Flag);
	mode_hfc(bcs, st->l1.mode, st->l1.bc);
	spin_unlock_irqrestore(&bcs->cs->lock, flags);
	l1_msg_b(st, pr, arg);
	break;
	case (PH_DEACTIVATE \| REQUEST):
	l1_msg_b(st, pr, arg);
	break;
	case (PH_DEACTIVATE \| CONFIRM):
	spin_lock_irqsave(&bcs->cs->lock, flags);
	test_and_clear_bit(BC_FLG_ACTIV, &bcs->Flag);
	test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
	mode_hfc(bcs, 0, st->l1.bc);
	spin_unlock_irqrestore(&bcs->cs->lock, flags);
	st->l1.l1l2(st, PH_DEACTIVATE \| CONFIRM, NULL);
	break;
	}
	}


	static void
	close_hfcstate(struct BCState *bcs)
	{
	mode_hfc(bcs, 0, bcs->channel);
	if (test_bit(BC_FLG_INIT, &bcs->Flag)) {
	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;
	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, struct BCState bcs)
	{
	if (!test_and_set_bit(BC_FLG_INIT, &bcs->Flag)) {
	skb_queue_head_init(&bcs->rqueue);
	skb_queue_head_init(&bcs->squeue);
	}
	bcs->tx_skb = NULL;
	test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
	bcs->event = 0;
	bcs->tx_cnt = 0;
	return (0);
	}

	static int
	setstack_hfc(struct PStack st, struct BCState bcs)
	{
	bcs->channel = st->l1.bc;
	if (open_hfcstate(st->l1.hardware, bcs))
	return (-1);
	st->l1.bcs = bcs;
	st->l2.l2l1 = hfc_l2l1;
	setstack_manager(st);
	bcs->st = st;
	setstack_l1_B(st);
	return (0);
	}

	static 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;
	}

	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)
	{
	kfree(cs->bcs[0].hw.hfc.send);
	cs->bcs[0].hw.hfc.send = NULL;
	kfree(cs->bcs[1].hw.hfc.send);
	cs->bcs[1].hw.hfc.send = NULL;
	}