hfc_pci.c

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		ptr1 = bdata + (*z2r - B_SUB_VAL);	/* start of data */
		memcpy(ptr, ptr1, maxlen);	/* copy data */
		fcnt -= maxlen;

		if (fcnt) {	/* rest remaining */
			ptr += maxlen;
			ptr1 = bdata;	/* start of buffer */
			memcpy(ptr, ptr1, fcnt);	/* rest */
		}
		cli();
		skb_queue_tail(&bcs->rqueue, skb);
		sti();
		hfcpci_sched_event(bcs, B_RCVBUFREADY);
	}

	*z2r = new_z2;		/* new position */
	return (1);
}				/* hfcpci_empty_fifo_trans */

/**********************************/
/* B-channel main receive routine */
/**********************************/
void
main_rec_hfcpci(struct BCState *bcs)
{
	long flags;
	struct IsdnCardState *cs = bcs->cs;
	int rcnt, real_fifo;
	int receive, count = 5;
	struct sk_buff *skb;
	bzfifo_type *bz;
	u_char *bdata;
	z_type *zp;


	save_flags(flags);
	if ((bcs->channel) && (!cs->hw.hfcpci.bswapped)) {
		bz = &((fifo_area *) (cs->hw.hfcpci.fifos))->b_chans.rxbz_b2;
		bdata = ((fifo_area *) (cs->hw.hfcpci.fifos))->b_chans.rxdat_b2;
		real_fifo = 1;
	} else {
		bz = &((fifo_area *) (cs->hw.hfcpci.fifos))->b_chans.rxbz_b1;
		bdata = ((fifo_area *) (cs->hw.hfcpci.fifos))->b_chans.rxdat_b1;
		real_fifo = 0;
	}
      Begin:
	count--;
	cli();
	if (test_and_set_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags)) {
		debugl1(cs, "rec_data %d blocked", bcs->channel);
		restore_flags(flags);
		return;
	}
	sti();
	if (bz->f1 != bz->f2) {
		if (cs->debug & L1_DEB_HSCX)
			debugl1(cs, "hfcpci rec %d f1(%d) f2(%d)",
				bcs->channel, bz->f1, bz->f2);
		zp = &bz->za[bz->f2];

		rcnt = zp->z1 - zp->z2;
		if (rcnt < 0)
			rcnt += B_FIFO_SIZE;
		rcnt++;
		if (cs->debug & L1_DEB_HSCX)
			debugl1(cs, "hfcpci rec %d z1(%x) z2(%x) cnt(%d)",
				bcs->channel, zp->z1, zp->z2, rcnt);
		if ((skb = hfcpci_empty_fifo(bcs, bz, bdata, rcnt))) {
			cli();
			skb_queue_tail(&bcs->rqueue, skb);
			sti();
			hfcpci_sched_event(bcs, B_RCVBUFREADY);
		}
		rcnt = bz->f1 - bz->f2;
		if (rcnt < 0)
			rcnt += MAX_B_FRAMES + 1;
		if (cs->hw.hfcpci.last_bfifo_cnt[real_fifo] > rcnt + 1) {
		        rcnt = 0;
			hfcpci_clear_fifo_rx(cs, real_fifo);
		}
		cs->hw.hfcpci.last_bfifo_cnt[real_fifo] = rcnt;
		if (rcnt > 1)
			receive = 1;
		else
			receive = 0;
	} else if (bcs->mode == L1_MODE_TRANS)
		receive = hfcpci_empty_fifo_trans(bcs, bz, bdata);
	else
		receive = 0;
	test_and_clear_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags);
	if (count && receive)
		goto Begin;
	restore_flags(flags);
	return;
}

/**************************/
/* D-channel send routine */
/**************************/
static void
hfcpci_fill_dfifo(struct IsdnCardState *cs)
{
	long flags;
	int fcnt;
	int count, new_z1, maxlen;
	dfifo_type *df;
	u_char *src, *dst, new_f1;

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

	df = &((fifo_area *) (cs->hw.hfcpci.fifos))->d_chan.d_tx;

	if (cs->debug & L1_DEB_ISAC)
		debugl1(cs, "hfcpci_fill_Dfifo f1(%d) f2(%d) z1(f1)(%x)",
			df->f1, df->f2,
			df->za[df->f1 & D_FREG_MASK].z1);
	fcnt = df->f1 - df->f2;	/* frame count actually buffered */
	if (fcnt < 0)
		fcnt += (MAX_D_FRAMES + 1);	/* if wrap around */
	if (fcnt > (MAX_D_FRAMES - 1)) {
		if (cs->debug & L1_DEB_ISAC)
			debugl1(cs, "hfcpci_fill_Dfifo more as 14 frames");
#ifdef ERROR_STATISTIC
		cs->err_tx++;
#endif
		return;
	}
	/* now determine free bytes in FIFO buffer */
	count = df->za[df->f1 & D_FREG_MASK].z2 - df->za[df->f1 & D_FREG_MASK].z1;
	if (count <= 0)
		count += D_FIFO_SIZE;	/* count now contains available bytes */

	if (cs->debug & L1_DEB_ISAC)
		debugl1(cs, "hfcpci_fill_Dfifo count(%ld/%d)",
			cs->tx_skb->len, count);
	if (count < cs->tx_skb->len) {
		if (cs->debug & L1_DEB_ISAC)
			debugl1(cs, "hfcpci_fill_Dfifo no fifo mem");
		return;
	}
	count = cs->tx_skb->len;	/* get frame len */
	new_z1 = (df->za[df->f1 & D_FREG_MASK].z1 + count) & (D_FIFO_SIZE - 1);
	new_f1 = ((df->f1 + 1) & D_FREG_MASK) | (D_FREG_MASK + 1);
	src = cs->tx_skb->data;	/* source pointer */
	dst = df->data + df->za[df->f1 & D_FREG_MASK].z1;
	maxlen = D_FIFO_SIZE - df->za[df->f1 & D_FREG_MASK].z1;		/* end fifo */
	if (maxlen > count)
		maxlen = count;	/* limit size */
	memcpy(dst, src, maxlen);	/* first copy */

	count -= maxlen;	/* remaining bytes */
	if (count) {
		dst = df->data;	/* start of buffer */
		src += maxlen;	/* new position */
		memcpy(dst, src, count);
	}
	save_flags(flags);
	cli();
	df->za[new_f1 & D_FREG_MASK].z1 = new_z1;	/* for next buffer */
	df->za[df->f1 & D_FREG_MASK].z1 = new_z1;	/* new pos actual buffer */
	df->f1 = new_f1;	/* next frame */
	restore_flags(flags);

	dev_kfree_skb_any(cs->tx_skb);
	cs->tx_skb = NULL;
	return;
}

/**************************/
/* B-channel send routine */
/**************************/
static void
hfcpci_fill_fifo(struct BCState *bcs)
{
	struct IsdnCardState *cs = bcs->cs;
	unsigned long flags;
	int maxlen, fcnt;
	int count, new_z1;
	bzfifo_type *bz;
	u_char *bdata;
	u_char new_f1, *src, *dst;
	unsigned short *z1t, *z2t;

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

	save_flags(flags);
	sti();

	if ((bcs->channel) && (!cs->hw.hfcpci.bswapped)) {
		bz = &((fifo_area *) (cs->hw.hfcpci.fifos))->b_chans.txbz_b2;
		bdata = ((fifo_area *) (cs->hw.hfcpci.fifos))->b_chans.txdat_b2;
	} else {
		bz = &((fifo_area *) (cs->hw.hfcpci.fifos))->b_chans.txbz_b1;
		bdata = ((fifo_area *) (cs->hw.hfcpci.fifos))->b_chans.txdat_b1;
	}

	if (bcs->mode == L1_MODE_TRANS) {
		z1t = &bz->za[MAX_B_FRAMES].z1;
		z2t = z1t + 1;
		if (cs->debug & L1_DEB_HSCX)
			debugl1(cs, "hfcpci_fill_fifo_trans %d z1(%x) z2(%x)",
				bcs->channel, *z1t, *z2t);
		fcnt = *z2t - *z1t;
		if (fcnt <= 0)
			fcnt += B_FIFO_SIZE;	/* fcnt contains available bytes in fifo */
		fcnt = B_FIFO_SIZE - fcnt;	/* remaining bytes to send */

		while ((fcnt < 2 * HFCPCI_BTRANS_THRESHOLD) && (bcs->tx_skb)) {
			if (bcs->tx_skb->len < B_FIFO_SIZE - fcnt) {
				/* data is suitable for fifo */
				count = bcs->tx_skb->len;

				new_z1 = *z1t + count;	/* new buffer Position */
				if (new_z1 >= (B_FIFO_SIZE + B_SUB_VAL))
					new_z1 -= B_FIFO_SIZE;	/* buffer wrap */
				src = bcs->tx_skb->data;	/* source pointer */
				dst = bdata + (*z1t - B_SUB_VAL);
				maxlen = (B_FIFO_SIZE + B_SUB_VAL) - *z1t;	/* end of fifo */
				if (maxlen > count)
					maxlen = count;		/* limit size */
				memcpy(dst, src, maxlen);	/* first copy */

				count -= maxlen;	/* remaining bytes */
				if (count) {
					dst = bdata;	/* start of buffer */
					src += maxlen;	/* new position */
					memcpy(dst, src, count);
				}
				bcs->tx_cnt -= bcs->tx_skb->len;
				fcnt += bcs->tx_skb->len;
				*z1t = new_z1;	/* now send data */
			} else if (cs->debug & L1_DEB_HSCX)
				debugl1(cs, "hfcpci_fill_fifo_trans %d frame length %d discarded",
					bcs->channel, bcs->tx_skb->len);

			dev_kfree_skb_any(bcs->tx_skb);
			cli();
			bcs->tx_skb = skb_dequeue(&bcs->squeue);	/* fetch next data */
			sti();
		}
		test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
		restore_flags(flags);
		return;
	}
	if (cs->debug & L1_DEB_HSCX)
		debugl1(cs, "hfcpci_fill_fifo_hdlc %d f1(%d) f2(%d) z1(f1)(%x)",
			bcs->channel, bz->f1, bz->f2,
			bz->za[bz->f1].z1);

	fcnt = bz->f1 - bz->f2;	/* frame count actually buffered */
	if (fcnt < 0)
		fcnt += (MAX_B_FRAMES + 1);	/* if wrap around */
	if (fcnt > (MAX_B_FRAMES - 1)) {
		if (cs->debug & L1_DEB_HSCX)
			debugl1(cs, "hfcpci_fill_Bfifo more as 14 frames");
		restore_flags(flags);
		return;
	}
	/* now determine free bytes in FIFO buffer */
	count = bz->za[bz->f1].z2 - bz->za[bz->f1].z1;
	if (count <= 0)
		count += B_FIFO_SIZE;	/* count now contains available bytes */

	if (cs->debug & L1_DEB_HSCX)
		debugl1(cs, "hfcpci_fill_fifo %d count(%ld/%d),%lx",
			bcs->channel, bcs->tx_skb->len,
			count, current->state);

	if (count < bcs->tx_skb->len) {
		if (cs->debug & L1_DEB_HSCX)
			debugl1(cs, "hfcpci_fill_fifo no fifo mem");
		restore_flags(flags);
		return;
	}
	count = bcs->tx_skb->len;	/* get frame len */
	new_z1 = bz->za[bz->f1].z1 + count;	/* new buffer Position */
	if (new_z1 >= (B_FIFO_SIZE + B_SUB_VAL))
		new_z1 -= B_FIFO_SIZE;	/* buffer wrap */

	new_f1 = ((bz->f1 + 1) & MAX_B_FRAMES);
	src = bcs->tx_skb->data;	/* source pointer */
	dst = bdata + (bz->za[bz->f1].z1 - B_SUB_VAL);
	maxlen = (B_FIFO_SIZE + B_SUB_VAL) - bz->za[bz->f1].z1;		/* end fifo */
	if (maxlen > count)
		maxlen = count;	/* limit size */
	memcpy(dst, src, maxlen);	/* first copy */

	count -= maxlen;	/* remaining bytes */
	if (count) {
		dst = bdata;	/* start of buffer */
		src += maxlen;	/* new position */
		memcpy(dst, src, count);
	}
	bcs->tx_cnt -= bcs->tx_skb->len;
	if (bcs->st->lli.l1writewakeup &&
	    (PACKET_NOACK != bcs->tx_skb->pkt_type))
		bcs->st->lli.l1writewakeup(bcs->st, bcs->tx_skb->len);

	cli();
	bz->za[new_f1].z1 = new_z1;	/* for next buffer */
	bz->f1 = new_f1;	/* next frame */
	restore_flags(flags);

	dev_kfree_skb_any(bcs->tx_skb);
	bcs->tx_skb = NULL;
	test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
	return;
}

/**********************************************/
/* D-channel l1 state call for leased NT-mode */
/**********************************************/
static void
dch_nt_l2l1(struct PStack *st, int pr, void *arg)
{
	struct IsdnCardState *cs = (struct IsdnCardState *) st->l1.hardware;

	switch (pr) {
		case (PH_DATA | REQUEST):
		case (PH_PULL | REQUEST):
		case (PH_PULL | INDICATION):
			st->l1.l1hw(st, pr, arg);
			break;
		case (PH_ACTIVATE | REQUEST):
			st->l1.l1l2(st, PH_ACTIVATE | CONFIRM, NULL);
			break;
		case (PH_TESTLOOP | REQUEST):
			if (1 & (long) arg)
				debugl1(cs, "PH_TEST_LOOP B1");
			if (2 & (long) arg)
				debugl1(cs, "PH_TEST_LOOP B2");
			if (!(3 & (long) arg))
				debugl1(cs, "PH_TEST_LOOP DISABLED");
			st->l1.l1hw(st, HW_TESTLOOP | REQUEST, arg);
			break;
		default:
			if (cs->debug)
				debugl1(cs, "dch_nt_l2l1 msg %04X unhandled", pr);
			break;
	}
}



/***********************/
/* set/reset echo mode */
/***********************/
static int
hfcpci_auxcmd(struct IsdnCardState *cs, isdn_ctrl * ic)
{
	unsigned long flags;
	int i = *(unsigned int *) ic->parm.num;

	if ((ic->arg == 98) &&
	    (!(cs->hw.hfcpci.int_m1 & (HFCPCI_INTS_B2TRANS + HFCPCI_INTS_B2REC + HFCPCI_INTS_B1TRANS + HFCPCI_INTS_B1REC)))) {
		save_flags(flags);
		cli();
		Write_hfc(cs, HFCPCI_CLKDEL, CLKDEL_NT); /* ST-Bit delay for NT-Mode */
		Write_hfc(cs, HFCPCI_STATES, HFCPCI_LOAD_STATE | 0);	/* HFC ST G0 */
		udelay(10);
		cs->hw.hfcpci.sctrl |= SCTRL_MODE_NT;
		Write_hfc(cs, HFCPCI_SCTRL, cs->hw.hfcpci.sctrl);	/* set NT-mode */
		udelay(10);
		Write_hfc(cs, HFCPCI_STATES, HFCPCI_LOAD_STATE | 1);	/* HFC ST G1 */
		udelay(10);
		Write_hfc(cs, HFCPCI_STATES, 1 | HFCPCI_ACTIVATE | HFCPCI_DO_ACTION);
		cs->dc.hfcpci.ph_state = 1;
		cs->hw.hfcpci.nt_mode = 1;
		cs->hw.hfcpci.nt_timer = 0;
		cs->stlist->l2.l2l1 = dch_nt_l2l1;
		restore_flags(flags);
		debugl1(cs, "NT mode activated");
		return (0);
	}
	if ((cs->chanlimit > 1) || (cs->hw.hfcpci.bswapped) ||
	    (cs->hw.hfcpci.nt_mode) || (ic->arg != 12))
		return (-EINVAL);

	save_flags(flags);
	cli();
	if (i) {
		cs->logecho = 1;
		cs->hw.hfcpci.trm |= 0x20;	/* enable echo chan */
		cs->hw.hfcpci.int_m1 |= HFCPCI_INTS_B2REC;
		cs->hw.hfcpci.fifo_en |= HFCPCI_FIFOEN_B2RX;
	} else {
		cs->logecho = 0;
		cs->hw.hfcpci.trm &= ~0x20;	/* disable echo chan */
		cs->hw.hfcpci.int_m1 &= ~HFCPCI_INTS_B2REC;
		cs->hw.hfcpci.fifo_en &= ~HFCPCI_FIFOEN_B2RX;
	}
	cs->hw.hfcpci.sctrl_r &= ~SCTRL_B2_ENA;
	cs->hw.hfcpci.sctrl &= ~SCTRL_B2_ENA;
	cs->hw.hfcpci.conn |= 0x10;	/* B2-IOM -> B2-ST */
	cs->hw.hfcpci.ctmt &= ~2;
	Write_hfc(cs, HFCPCI_CTMT, cs->hw.hfcpci.ctmt);
	Write_hfc(cs, HFCPCI_SCTRL_R, cs->hw.hfcpci.sctrl_r);
	Write_hfc(cs, HFCPCI_SCTRL, cs->hw.hfcpci.sctrl);
	Write_hfc(cs, HFCPCI_CONNECT, cs->hw.hfcpci.conn);
	Write_hfc(cs, HFCPCI_TRM, cs->hw.hfcpci.trm);
	Write_hfc(cs, HFCPCI_FIFO_EN, cs->hw.hfcpci.fifo_en);
	Write_hfc(cs, HFCPCI_INT_M1, cs->hw.hfcpci.int_m1);
	restore_flags(flags);
	return (0);
}				/* hfcpci_auxcmd */

/*****************************/
/* E-channel receive routine */
/*****************************/
static void
receive_emsg(struct IsdnCardState *cs)
{
	long flags;
	int rcnt;
	int receive, count = 5;
	bzfifo_type *bz;
	u_char *bdata;
	z_type *zp;
	u_char *ptr, *ptr1, new_f2;
	int total, maxlen, new_z2;
	u_char e_buffer[256];

	save_flags(flags);
	bz = &((fifo_area *) (cs->hw.hfcpci.fifos))->b_chans.rxbz_b2;
	bdata = ((fifo_area *) (cs->hw.hfcpci.fifos))->b_chans.rxdat_b2;
      Begin:
	count--;
	cli();
	if (test_and_set_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags)) {
		debugl1(cs, "echo_rec_data blocked");
		restore_flags(flags);
		return;
	}
	sti();
	if (bz->f1 != bz->f2) {
		if (cs->debug & L1_DEB_ISAC)
			debugl1(cs, "hfcpci e_rec f1(%d) f2(%d)",
				bz->f1, bz->f2);
		zp = &bz->za[bz->f2];

		rcnt = zp->z1 - zp->z2;
		if (rcnt < 0)