Initial import

1 files changed, 678 insertions, 0 deletions

diff --git a/drivers/isdn/hisax/isac.c b/drivers/isdn/hisax/isac.c
new file mode 100644
index 000000000..7fdf78f46
--- /dev/null
+++ b/drivers/isdn/hisax/isac.c
@@ -0,0 +1,678 @@
+/* $Id: isac.c,v 1.31.2.3 2004/01/13 14:31:25 keil Exp $
+ *
+ * ISAC specific routines
+ *
+ * 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.
+ *
+ * For changes and modifications please read
+ * Documentation/isdn/HiSax.cert
+ *
+ */
+
+#include "hisax.h"
+#include "isac.h"
+#include "arcofi.h"
+#include "isdnl1.h"
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+
+#define DBUSY_TIMER_VALUE 80
+#define ARCOFI_USE 1
+
+static char *ISACVer[] =
+{"2086/2186 V1.1", "2085 B1", "2085 B2",
+ "2085 V2.3"};
+
+void ISACVersion(struct IsdnCardState *cs, char *s)
+{
+	int val;
+
+	val = cs->readisac(cs, ISAC_RBCH);
+	printk(KERN_INFO "%s ISAC version (%x): %s\n", s, val, ISACVer[(val >> 5) & 3]);
+}
+
+static void
+ph_command(struct IsdnCardState *cs, unsigned int command)
+{
+	if (cs->debug & L1_DEB_ISAC)
+		debugl1(cs, "ph_command %x", command);
+	cs->writeisac(cs, ISAC_CIX0, (command << 2) | 3);
+}
+
+
+static void
+isac_new_ph(struct IsdnCardState *cs)
+{
+	switch (cs->dc.isac.ph_state) {
+	case (ISAC_IND_RS):
+	case (ISAC_IND_EI):
+		ph_command(cs, ISAC_CMD_DUI);
+		l1_msg(cs, HW_RESET | INDICATION, NULL);
+		break;
+	case (ISAC_IND_DID):
+		l1_msg(cs, HW_DEACTIVATE | CONFIRM, NULL);
+		break;
+	case (ISAC_IND_DR):
+		l1_msg(cs, HW_DEACTIVATE | INDICATION, NULL);
+		break;
+	case (ISAC_IND_PU):
+		l1_msg(cs, HW_POWERUP | CONFIRM, NULL);
+		break;
+	case (ISAC_IND_RSY):
+		l1_msg(cs, HW_RSYNC | INDICATION, NULL);
+		break;
+	case (ISAC_IND_ARD):
+		l1_msg(cs, HW_INFO2 | INDICATION, NULL);
+		break;
+	case (ISAC_IND_AI8):
+		l1_msg(cs, HW_INFO4_P8 | INDICATION, NULL);
+		break;
+	case (ISAC_IND_AI10):
+		l1_msg(cs, HW_INFO4_P10 | INDICATION, NULL);
+		break;
+	default:
+		break;
+	}
+}
+
+static void
+isac_bh(struct work_struct *work)
+{
+	struct IsdnCardState *cs =
+		container_of(work, struct IsdnCardState, tqueue);
+	struct PStack *stptr;
+
+	if (test_and_clear_bit(D_CLEARBUSY, &cs->event)) {
+		if (cs->debug)
+			debugl1(cs, "D-Channel Busy cleared");
+		stptr = cs->stlist;
+		while (stptr != NULL) {
+			stptr->l1.l1l2(stptr, PH_PAUSE | CONFIRM, NULL);
+			stptr = stptr->next;
+		}
+	}
+	if (test_and_clear_bit(D_L1STATECHANGE, &cs->event))
+		isac_new_ph(cs);
+	if (test_and_clear_bit(D_RCVBUFREADY, &cs->event))
+		DChannel_proc_rcv(cs);
+	if (test_and_clear_bit(D_XMTBUFREADY, &cs->event))
+		DChannel_proc_xmt(cs);
+#if ARCOFI_USE
+	if (!test_bit(HW_ARCOFI, &cs->HW_Flags))
+		return;
+	if (test_and_clear_bit(D_RX_MON1, &cs->event))
+		arcofi_fsm(cs, ARCOFI_RX_END, NULL);
+	if (test_and_clear_bit(D_TX_MON1, &cs->event))
+		arcofi_fsm(cs, ARCOFI_TX_END, NULL);
+#endif
+}
+
+static void
+isac_empty_fifo(struct IsdnCardState *cs, int count)
+{
+	u_char *ptr;
+
+	if ((cs->debug & L1_DEB_ISAC) && !(cs->debug & L1_DEB_ISAC_FIFO))
+		debugl1(cs, "isac_empty_fifo");
+
+	if ((cs->rcvidx + count) >= MAX_DFRAME_LEN_L1) {
+		if (cs->debug & L1_DEB_WARN)
+			debugl1(cs, "isac_empty_fifo overrun %d",
+				cs->rcvidx + count);
+		cs->writeisac(cs, ISAC_CMDR, 0x80);
+		cs->rcvidx = 0;
+		return;
+	}
+	ptr = cs->rcvbuf + cs->rcvidx;
+	cs->rcvidx += count;
+	cs->readisacfifo(cs, ptr, count);
+	cs->writeisac(cs, ISAC_CMDR, 0x80);
+	if (cs->debug & L1_DEB_ISAC_FIFO) {
+		char *t = cs->dlog;
+
+		t += sprintf(t, "isac_empty_fifo cnt %d", count);
+		QuickHex(t, ptr, count);
+		debugl1(cs, "%s", cs->dlog);
+	}
+}
+
+static void
+isac_fill_fifo(struct IsdnCardState *cs)
+{
+	int count, more;
+	u_char *ptr;
+
+	if ((cs->debug & L1_DEB_ISAC) && !(cs->debug & L1_DEB_ISAC_FIFO))
+		debugl1(cs, "isac_fill_fifo");
+
+	if (!cs->tx_skb)
+		return;
+
+	count = cs->tx_skb->len;
+	if (count <= 0)
+		return;
+
+	more = 0;
+	if (count > 32) {
+		more = !0;
+		count = 32;
+	}
+	ptr = cs->tx_skb->data;
+	skb_pull(cs->tx_skb, count);
+	cs->tx_cnt += count;
+	cs->writeisacfifo(cs, ptr, count);
+	cs->writeisac(cs, ISAC_CMDR, more ? 0x8 : 0xa);
+	if (test_and_set_bit(FLG_DBUSY_TIMER, &cs->HW_Flags)) {
+		debugl1(cs, "isac_fill_fifo dbusytimer running");
+		del_timer(&cs->dbusytimer);
+	}
+	init_timer(&cs->dbusytimer);
+	cs->dbusytimer.expires = jiffies + ((DBUSY_TIMER_VALUE * HZ)/1000);
+	add_timer(&cs->dbusytimer);
+	if (cs->debug & L1_DEB_ISAC_FIFO) {
+		char *t = cs->dlog;
+
+		t += sprintf(t, "isac_fill_fifo cnt %d", count);
+		QuickHex(t, ptr, count);
+		debugl1(cs, "%s", cs->dlog);
+	}
+}
+
+void
+isac_interrupt(struct IsdnCardState *cs, u_char val)
+{
+	u_char exval, v1;
+	struct sk_buff *skb;
+	unsigned int count;
+
+	if (cs->debug & L1_DEB_ISAC)
+		debugl1(cs, "ISAC interrupt %x", val);
+	if (val & 0x80) {	/* RME */
+		exval = cs->readisac(cs, ISAC_RSTA);
+		if ((exval & 0x70) != 0x20) {
+			if (exval & 0x40) {
+				if (cs->debug & L1_DEB_WARN)
+					debugl1(cs, "ISAC RDO");
+#ifdef ERROR_STATISTIC
+				cs->err_rx++;
+#endif
+			}
+			if (!(exval & 0x20)) {
+				if (cs->debug & L1_DEB_WARN)
+					debugl1(cs, "ISAC CRC error");
+#ifdef ERROR_STATISTIC
+				cs->err_crc++;
+#endif
+			}
+			cs->writeisac(cs, ISAC_CMDR, 0x80);
+		} else {
+			count = cs->readisac(cs, ISAC_RBCL) & 0x1f;
+			if (count == 0)
+				count = 32;
+			isac_empty_fifo(cs, count);
+			if ((count = cs->rcvidx) > 0) {
+				cs->rcvidx = 0;
+				if (!(skb = alloc_skb(count, GFP_ATOMIC)))
+					printk(KERN_WARNING "HiSax: D receive out of memory\n");
+				else {
+					memcpy(skb_put(skb, count), cs->rcvbuf, count);
+					skb_queue_tail(&cs->rq, skb);
+				}
+			}
+		}
+		cs->rcvidx = 0;
+		schedule_event(cs, D_RCVBUFREADY);
+	}
+	if (val & 0x40) {	/* RPF */
+		isac_empty_fifo(cs, 32);
+	}
+	if (val & 0x20) {	/* RSC */
+		/* never */
+		if (cs->debug & L1_DEB_WARN)
+			debugl1(cs, "ISAC RSC interrupt");
+	}
+	if (val & 0x10) {	/* XPR */
+		if (test_and_clear_bit(FLG_DBUSY_TIMER, &cs->HW_Flags))
+			del_timer(&cs->dbusytimer);
+		if (test_and_clear_bit(FLG_L1_DBUSY, &cs->HW_Flags))
+			schedule_event(cs, D_CLEARBUSY);
+		if (cs->tx_skb) {
+			if (cs->tx_skb->len) {
+				isac_fill_fifo(cs);
+				goto afterXPR;
+			} else {
+				dev_kfree_skb_irq(cs->tx_skb);
+				cs->tx_cnt = 0;
+				cs->tx_skb = NULL;
+			}
+		}
+		if ((cs->tx_skb = skb_dequeue(&cs->sq))) {
+			cs->tx_cnt = 0;
+			isac_fill_fifo(cs);
+		} else
+			schedule_event(cs, D_XMTBUFREADY);
+	}
+afterXPR:
+	if (val & 0x04) {	/* CISQ */
+		exval = cs->readisac(cs, ISAC_CIR0);
+		if (cs->debug & L1_DEB_ISAC)
+			debugl1(cs, "ISAC CIR0 %02X", exval);
+		if (exval & 2) {
+			cs->dc.isac.ph_state = (exval >> 2) & 0xf;
+			if (cs->debug & L1_DEB_ISAC)
+				debugl1(cs, "ph_state change %x", cs->dc.isac.ph_state);
+			schedule_event(cs, D_L1STATECHANGE);
+		}
+		if (exval & 1) {
+			exval = cs->readisac(cs, ISAC_CIR1);
+			if (cs->debug & L1_DEB_ISAC)
+				debugl1(cs, "ISAC CIR1 %02X", exval);
+		}
+	}
+	if (val & 0x02) {	/* SIN */
+		/* never */
+		if (cs->debug & L1_DEB_WARN)
+			debugl1(cs, "ISAC SIN interrupt");
+	}
+	if (val & 0x01) {	/* EXI */
+		exval = cs->readisac(cs, ISAC_EXIR);
+		if (cs->debug & L1_DEB_WARN)
+			debugl1(cs, "ISAC EXIR %02x", exval);
+		if (exval & 0x80) {  /* XMR */
+			debugl1(cs, "ISAC XMR");
+			printk(KERN_WARNING "HiSax: ISAC XMR\n");
+		}
+		if (exval & 0x40) {  /* XDU */
+			debugl1(cs, "ISAC XDU");
+			printk(KERN_WARNING "HiSax: ISAC XDU\n");
+#ifdef ERROR_STATISTIC
+			cs->err_tx++;
+#endif
+			if (test_and_clear_bit(FLG_DBUSY_TIMER, &cs->HW_Flags))
+				del_timer(&cs->dbusytimer);
+			if (test_and_clear_bit(FLG_L1_DBUSY, &cs->HW_Flags))
+				schedule_event(cs, D_CLEARBUSY);
+			if (cs->tx_skb) { /* Restart frame */
+				skb_push(cs->tx_skb, cs->tx_cnt);
+				cs->tx_cnt = 0;
+				isac_fill_fifo(cs);
+			} else {
+				printk(KERN_WARNING "HiSax: ISAC XDU no skb\n");
+				debugl1(cs, "ISAC XDU no skb");
+			}
+		}
+		if (exval & 0x04) {  /* MOS */
+			v1 = cs->readisac(cs, ISAC_MOSR);
+			if (cs->debug & L1_DEB_MONITOR)
+				debugl1(cs, "ISAC MOSR %02x", v1);
+#if ARCOFI_USE
+			if (v1 & 0x08) {
+				if (!cs->dc.isac.mon_rx) {
+					if (!(cs->dc.isac.mon_rx = kmalloc(MAX_MON_FRAME, GFP_ATOMIC))) {
+						if (cs->debug & L1_DEB_WARN)
+							debugl1(cs, "ISAC MON RX out of memory!");
+						cs->dc.isac.mocr &= 0xf0;
+						cs->dc.isac.mocr |= 0x0a;
+						cs->writeisac(cs, ISAC_MOCR, cs->dc.isac.mocr);
+						goto afterMONR0;
+					} else
+						cs->dc.isac.mon_rxp = 0;
+				}
+				if (cs->dc.isac.mon_rxp >= MAX_MON_FRAME) {
+					cs->dc.isac.mocr &= 0xf0;
+					cs->dc.isac.mocr |= 0x0a;
+					cs->writeisac(cs, ISAC_MOCR, cs->dc.isac.mocr);
+					cs->dc.isac.mon_rxp = 0;
+					if (cs->debug & L1_DEB_WARN)
+						debugl1(cs, "ISAC MON RX overflow!");
+					goto afterMONR0;
+				}
+				cs->dc.isac.mon_rx[cs->dc.isac.mon_rxp++] = cs->readisac(cs, ISAC_MOR0);
+				if (cs->debug & L1_DEB_MONITOR)
+					debugl1(cs, "ISAC MOR0 %02x", cs->dc.isac.mon_rx[cs->dc.isac.mon_rxp - 1]);
+				if (cs->dc.isac.mon_rxp == 1) {
+					cs->dc.isac.mocr |= 0x04;
+					cs->writeisac(cs, ISAC_MOCR, cs->dc.isac.mocr);
+				}
+			}
+		afterMONR0:
+			if (v1 & 0x80) {
+				if (!cs->dc.isac.mon_rx) {
+					if (!(cs->dc.isac.mon_rx = kmalloc(MAX_MON_FRAME, GFP_ATOMIC))) {
+						if (cs->debug & L1_DEB_WARN)
+							debugl1(cs, "ISAC MON RX out of memory!");
+						cs->dc.isac.mocr &= 0x0f;
+						cs->dc.isac.mocr |= 0xa0;
+						cs->writeisac(cs, ISAC_MOCR, cs->dc.isac.mocr);
+						goto afterMONR1;
+					} else
+						cs->dc.isac.mon_rxp = 0;
+				}
+				if (cs->dc.isac.mon_rxp >= MAX_MON_FRAME) {
+					cs->dc.isac.mocr &= 0x0f;
+					cs->dc.isac.mocr |= 0xa0;
+					cs->writeisac(cs, ISAC_MOCR, cs->dc.isac.mocr);
+					cs->dc.isac.mon_rxp = 0;
+					if (cs->debug & L1_DEB_WARN)
+						debugl1(cs, "ISAC MON RX overflow!");
+					goto afterMONR1;
+				}
+				cs->dc.isac.mon_rx[cs->dc.isac.mon_rxp++] = cs->readisac(cs, ISAC_MOR1);
+				if (cs->debug & L1_DEB_MONITOR)
+					debugl1(cs, "ISAC MOR1 %02x", cs->dc.isac.mon_rx[cs->dc.isac.mon_rxp - 1]);
+				cs->dc.isac.mocr |= 0x40;
+				cs->writeisac(cs, ISAC_MOCR, cs->dc.isac.mocr);
+			}
+		afterMONR1:
+			if (v1 & 0x04) {
+				cs->dc.isac.mocr &= 0xf0;
+				cs->writeisac(cs, ISAC_MOCR, cs->dc.isac.mocr);
+				cs->dc.isac.mocr |= 0x0a;
+				cs->writeisac(cs, ISAC_MOCR, cs->dc.isac.mocr);
+				schedule_event(cs, D_RX_MON0);
+			}
+			if (v1 & 0x40) {
+				cs->dc.isac.mocr &= 0x0f;
+				cs->writeisac(cs, ISAC_MOCR, cs->dc.isac.mocr);
+				cs->dc.isac.mocr |= 0xa0;
+				cs->writeisac(cs, ISAC_MOCR, cs->dc.isac.mocr);
+				schedule_event(cs, D_RX_MON1);
+			}
+			if (v1 & 0x02) {
+				if ((!cs->dc.isac.mon_tx) || (cs->dc.isac.mon_txc &&
+							      (cs->dc.isac.mon_txp >= cs->dc.isac.mon_txc) &&
+							      !(v1 & 0x08))) {
+					cs->dc.isac.mocr &= 0xf0;
+					cs->writeisac(cs, ISAC_MOCR, cs->dc.isac.mocr);
+					cs->dc.isac.mocr |= 0x0a;
+					cs->writeisac(cs, ISAC_MOCR, cs->dc.isac.mocr);
+					if (cs->dc.isac.mon_txc &&
+					    (cs->dc.isac.mon_txp >= cs->dc.isac.mon_txc))
+						schedule_event(cs, D_TX_MON0);
+					goto AfterMOX0;
+				}
+				if (cs->dc.isac.mon_txc && (cs->dc.isac.mon_txp >= cs->dc.isac.mon_txc)) {
+					schedule_event(cs, D_TX_MON0);
+					goto AfterMOX0;
+				}
+				cs->writeisac(cs, ISAC_MOX0,
+					      cs->dc.isac.mon_tx[cs->dc.isac.mon_txp++]);
+				if (cs->debug & L1_DEB_MONITOR)
+					debugl1(cs, "ISAC %02x -> MOX0", cs->dc.isac.mon_tx[cs->dc.isac.mon_txp - 1]);
+			}
+		AfterMOX0:
+			if (v1 & 0x20) {
+				if ((!cs->dc.isac.mon_tx) || (cs->dc.isac.mon_txc &&
+							      (cs->dc.isac.mon_txp >= cs->dc.isac.mon_txc) &&
+							      !(v1 & 0x80))) {
+					cs->dc.isac.mocr &= 0x0f;
+					cs->writeisac(cs, ISAC_MOCR, cs->dc.isac.mocr);
+					cs->dc.isac.mocr |= 0xa0;
+					cs->writeisac(cs, ISAC_MOCR, cs->dc.isac.mocr);
+					if (cs->dc.isac.mon_txc &&
+					    (cs->dc.isac.mon_txp >= cs->dc.isac.mon_txc))
+						schedule_event(cs, D_TX_MON1);
+					goto AfterMOX1;
+				}
+				if (cs->dc.isac.mon_txc && (cs->dc.isac.mon_txp >= cs->dc.isac.mon_txc)) {
+					schedule_event(cs, D_TX_MON1);
+					goto AfterMOX1;
+				}
+				cs->writeisac(cs, ISAC_MOX1,
+					      cs->dc.isac.mon_tx[cs->dc.isac.mon_txp++]);
+				if (cs->debug & L1_DEB_MONITOR)
+					debugl1(cs, "ISAC %02x -> MOX1", cs->dc.isac.mon_tx[cs->dc.isac.mon_txp - 1]);
+			}
+		AfterMOX1:;
+#endif
+		}
+	}
+}
+
+static void
+ISAC_l1hw(struct PStack *st, int pr, void *arg)
+{
+	struct IsdnCardState *cs = (struct IsdnCardState *) st->l1.hardware;
+	struct sk_buff *skb = arg;
+	u_long flags;
+	int  val;
+
+	switch (pr) {
+	case (PH_DATA | REQUEST):
+		if (cs->debug & DEB_DLOG_HEX)
+			LogFrame(cs, skb->data, skb->len);
+		if (cs->debug & DEB_DLOG_VERBOSE)
+			dlogframe(cs, skb, 0);
+		spin_lock_irqsave(&cs->lock, flags);
+		if (cs->tx_skb) {
+			skb_queue_tail(&cs->sq, skb);
+#ifdef L2FRAME_DEBUG		/* psa */
+			if (cs->debug & L1_DEB_LAPD)
+				Logl2Frame(cs, skb, "PH_DATA Queued", 0);
+#endif
+		} else {
+			cs->tx_skb = skb;
+			cs->tx_cnt = 0;
+#ifdef L2FRAME_DEBUG		/* psa */
+			if (cs->debug & L1_DEB_LAPD)
+				Logl2Frame(cs, skb, "PH_DATA", 0);
+#endif
+			isac_fill_fifo(cs);
+		}
+		spin_unlock_irqrestore(&cs->lock, flags);
+		break;
+	case (PH_PULL | INDICATION):
+		spin_lock_irqsave(&cs->lock, flags);
+		if (cs->tx_skb) {
+			if (cs->debug & L1_DEB_WARN)
+				debugl1(cs, " l2l1 tx_skb exist this shouldn't happen");
+			skb_queue_tail(&cs->sq, skb);
+		} else {
+			if (cs->debug & DEB_DLOG_HEX)
+				LogFrame(cs, skb->data, skb->len);
+			if (cs->debug & DEB_DLOG_VERBOSE)
+				dlogframe(cs, skb, 0);
+			cs->tx_skb = skb;
+			cs->tx_cnt = 0;
+#ifdef L2FRAME_DEBUG		/* psa */
+			if (cs->debug & L1_DEB_LAPD)
+				Logl2Frame(cs, skb, "PH_DATA_PULLED", 0);
+#endif
+			isac_fill_fifo(cs);
+		}
+		spin_unlock_irqrestore(&cs->lock, flags);
+		break;
+	case (PH_PULL | REQUEST):
+#ifdef L2FRAME_DEBUG		/* psa */
+		if (cs->debug & L1_DEB_LAPD)
+			debugl1(cs, "-> PH_REQUEST_PULL");
+#endif
+		if (!cs->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 (HW_RESET | REQUEST):
+		spin_lock_irqsave(&cs->lock, flags);
+		if ((cs->dc.isac.ph_state == ISAC_IND_EI) ||
+		    (cs->dc.isac.ph_state == ISAC_IND_DR) ||
+		    (cs->dc.isac.ph_state == ISAC_IND_RS))
+			ph_command(cs, ISAC_CMD_TIM);
+		else
+			ph_command(cs, ISAC_CMD_RS);
+		spin_unlock_irqrestore(&cs->lock, flags);
+		break;
+	case (HW_ENABLE | REQUEST):
+		spin_lock_irqsave(&cs->lock, flags);
+		ph_command(cs, ISAC_CMD_TIM);
+		spin_unlock_irqrestore(&cs->lock, flags);
+		break;
+	case (HW_INFO3 | REQUEST):
+		spin_lock_irqsave(&cs->lock, flags);
+		ph_command(cs, ISAC_CMD_AR8);
+		spin_unlock_irqrestore(&cs->lock, flags);
+		break;
+	case (HW_TESTLOOP | REQUEST):
+		spin_lock_irqsave(&cs->lock, flags);
+		val = 0;
+		if (1 & (long) arg)
+			val |= 0x0c;
+		if (2 & (long) arg)
+			val |= 0x3;
+		if (test_bit(HW_IOM1, &cs->HW_Flags)) {
+			/* IOM 1 Mode */
+			if (!val) {
+				cs->writeisac(cs, ISAC_SPCR, 0xa);
+				cs->writeisac(cs, ISAC_ADF1, 0x2);
+			} else {
+				cs->writeisac(cs, ISAC_SPCR, val);
+				cs->writeisac(cs, ISAC_ADF1, 0xa);
+			}
+		} else {
+			/* IOM 2 Mode */
+			cs->writeisac(cs, ISAC_SPCR, val);
+			if (val)
+				cs->writeisac(cs, ISAC_ADF1, 0x8);
+			else
+				cs->writeisac(cs, ISAC_ADF1, 0x0);
+		}
+		spin_unlock_irqrestore(&cs->lock, flags);
+		break;
+	case (HW_DEACTIVATE | RESPONSE):
+		skb_queue_purge(&cs->rq);
+		skb_queue_purge(&cs->sq);
+		if (cs->tx_skb) {
+			dev_kfree_skb_any(cs->tx_skb);
+			cs->tx_skb = NULL;
+		}
+		if (test_and_clear_bit(FLG_DBUSY_TIMER, &cs->HW_Flags))
+			del_timer(&cs->dbusytimer);
+		if (test_and_clear_bit(FLG_L1_DBUSY, &cs->HW_Flags))
+			schedule_event(cs, D_CLEARBUSY);
+		break;
+	default:
+		if (cs->debug & L1_DEB_WARN)
+			debugl1(cs, "isac_l1hw unknown %04x", pr);
+		break;
+	}
+}
+
+static void
+setstack_isac(struct PStack *st, struct IsdnCardState *cs)
+{
+	st->l1.l1hw = ISAC_l1hw;
+}
+
+static void
+DC_Close_isac(struct IsdnCardState *cs)
+{
+	kfree(cs->dc.isac.mon_rx);
+	cs->dc.isac.mon_rx = NULL;
+	kfree(cs->dc.isac.mon_tx);
+	cs->dc.isac.mon_tx = NULL;
+}
+
+static void
+dbusy_timer_handler(struct IsdnCardState *cs)
+{
+	struct PStack *stptr;
+	int	rbch, star;
+
+	if (test_bit(FLG_DBUSY_TIMER, &cs->HW_Flags)) {
+		rbch = cs->readisac(cs, ISAC_RBCH);
+		star = cs->readisac(cs, ISAC_STAR);
+		if (cs->debug)
+			debugl1(cs, "D-Channel Busy RBCH %02x STAR %02x",
+				rbch, star);
+		if (rbch & ISAC_RBCH_XAC) { /* D-Channel Busy */
+			test_and_set_bit(FLG_L1_DBUSY, &cs->HW_Flags);
+			stptr = cs->stlist;
+			while (stptr != NULL) {
+				stptr->l1.l1l2(stptr, PH_PAUSE | INDICATION, NULL);
+				stptr = stptr->next;
+			}
+		} else {
+			/* discard frame; reset transceiver */
+			test_and_clear_bit(FLG_DBUSY_TIMER, &cs->HW_Flags);
+			if (cs->tx_skb) {
+				dev_kfree_skb_any(cs->tx_skb);
+				cs->tx_cnt = 0;
+				cs->tx_skb = NULL;
+			} else {
+				printk(KERN_WARNING "HiSax: ISAC D-Channel Busy no skb\n");
+				debugl1(cs, "D-Channel Busy no skb");
+			}
+			cs->writeisac(cs, ISAC_CMDR, 0x01); /* Transmitter reset */
+			cs->irq_func(cs->irq, cs);
+		}
+	}
+}
+
+void initisac(struct IsdnCardState *cs)
+{
+	cs->setstack_d = setstack_isac;
+	cs->DC_Close = DC_Close_isac;
+	cs->dc.isac.mon_tx = NULL;
+	cs->dc.isac.mon_rx = NULL;
+	cs->writeisac(cs, ISAC_MASK, 0xff);
+	cs->dc.isac.mocr = 0xaa;
+	if (test_bit(HW_IOM1, &cs->HW_Flags)) {
+		/* IOM 1 Mode */
+		cs->writeisac(cs, ISAC_ADF2, 0x0);
+		cs->writeisac(cs, ISAC_SPCR, 0xa);
+		cs->writeisac(cs, ISAC_ADF1, 0x2);
+		cs->writeisac(cs, ISAC_STCR, 0x70);
+		cs->writeisac(cs, ISAC_MODE, 0xc9);
+	} else {
+		/* IOM 2 Mode */
+		if (!cs->dc.isac.adf2)
+			cs->dc.isac.adf2 = 0x80;
+		cs->writeisac(cs, ISAC_ADF2, cs->dc.isac.adf2);
+		cs->writeisac(cs, ISAC_SQXR, 0x2f);
+		cs->writeisac(cs, ISAC_SPCR, 0x00);
+		cs->writeisac(cs, ISAC_STCR, 0x70);
+		cs->writeisac(cs, ISAC_MODE, 0xc9);
+		cs->writeisac(cs, ISAC_TIMR, 0x00);
+		cs->writeisac(cs, ISAC_ADF1, 0x00);
+	}
+	ph_command(cs, ISAC_CMD_RS);
+	cs->writeisac(cs, ISAC_MASK, 0x0);
+}
+
+void clear_pending_isac_ints(struct IsdnCardState *cs)
+{
+	int val, eval;
+
+	val = cs->readisac(cs, ISAC_STAR);
+	debugl1(cs, "ISAC STAR %x", val);
+	val = cs->readisac(cs, ISAC_MODE);
+	debugl1(cs, "ISAC MODE %x", val);
+	val = cs->readisac(cs, ISAC_ADF2);
+	debugl1(cs, "ISAC ADF2 %x", val);
+	val = cs->readisac(cs, ISAC_ISTA);
+	debugl1(cs, "ISAC ISTA %x", val);
+	if (val & 0x01) {
+		eval = cs->readisac(cs, ISAC_EXIR);
+		debugl1(cs, "ISAC EXIR %x", eval);
+	}
+	val = cs->readisac(cs, ISAC_CIR0);
+	debugl1(cs, "ISAC CIR0 %x", val);
+	cs->dc.isac.ph_state = (val >> 2) & 0xf;
+	schedule_event(cs, D_L1STATECHANGE);
+	/* Disable all IRQ */
+	cs->writeisac(cs, ISAC_MASK, 0xFF);
+}
+
+void setup_isac(struct IsdnCardState *cs)
+{
+	INIT_WORK(&cs->tqueue, isac_bh);
+	cs->dbusytimer.function = (void *) dbusy_timer_handler;
+	cs->dbusytimer.data = (long) cs;
+	init_timer(&cs->dbusytimer);
+}