patch-2.0.36 linux/drivers/isdn/hisax/hscx_irq.c

• Lines: 309
• Date: Sun Nov 15 10:32:58 1998
• Orig file: v2.0.35/linux/drivers/isdn/hisax/hscx_irq.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.0.35/linux/drivers/isdn/hisax/hscx_irq.c linux/drivers/isdn/hisax/hscx_irq.c
@@ -0,0 +1,308 @@
+/* $Id: hscx_irq.c,v 1.5.2.5 1998/11/03 00:06:39 keil Exp $
+
+ * hscx_irq.c     low level b-channel stuff for Siemens HSCX
+ *
+ * Author     Karsten Keil (keil@isdn4linux.de)
+ *
+ * This is an include file for fast inline IRQ stuff
+ *
+ * $Log: hscx_irq.c,v $
+ * Revision 1.5.2.5  1998/11/03 00:06:39  keil
+ * certification related changes
+ * fixed logging for smaller stack use
+ *
+ * Revision 1.5.2.4  1998/09/27 13:06:16  keil
+ * Apply most changes from 2.1.X (HiSax 3.1)
+ *
+ * Revision 1.5.2.3  1998/06/24 14:43:56  keil
+ * Fix recovery of TX IRQ loss
+ *
+ * Revision 1.5.2.2  1998/05/27 18:05:36  keil
+ * HiSax 3.0
+ *
+ * Revision 1.5.2.1  1997/10/17 22:10:46  keil
+ * new files on 2.0
+ *
+ * Revision 1.4  1997/08/15 17:48:02  keil
+ * cosmetic
+ *
+ * Revision 1.3  1997/07/27 21:38:36  keil
+ * new B-channel interface
+ *
+ * Revision 1.2  1997/06/26 11:16:19  keil
+ * first version
+ *
+ *
+ */
+
+
+static inline void
+waitforCEC(struct IsdnCardState *cs, int hscx)
+{
+	int to = 50;
+
+	while ((READHSCX(cs, hscx, HSCX_STAR) & 0x04) && to) {
+		udelay(1);
+		to--;
+	}
+	if (!to)
+		printk(KERN_WARNING "HiSax: waitforCEC timeout\n");
+}
+
+
+static inline void
+waitforXFW(struct IsdnCardState *cs, int hscx)
+{
+	int to = 50;
+
+	while ((!(READHSCX(cs, hscx, HSCX_STAR) & 0x44) == 0x40) && to) {
+		udelay(1);
+		to--;
+	}
+	if (!to)
+		printk(KERN_WARNING "HiSax: waitforXFW timeout\n");
+}
+
+static inline void
+WriteHSCXCMDR(struct IsdnCardState *cs, int hscx, u_char data)
+{
+	long flags;
+
+	save_flags(flags);
+	cli();
+	waitforCEC(cs, hscx);
+	WRITEHSCX(cs, hscx, HSCX_CMDR, data);
+	restore_flags(flags);
+}
+
+
+
+static void
+hscx_empty_fifo(struct BCState *bcs, int count)
+{
+	u_char *ptr;
+	struct IsdnCardState *cs = bcs->cs;
+	long flags;
+
+	if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
+		debugl1(cs, "hscx_empty_fifo");
+
+	if (bcs->hw.hscx.rcvidx + count > HSCX_BUFMAX) {
+		if (cs->debug & L1_DEB_WARN)
+			debugl1(cs, "hscx_empty_fifo: incoming packet too large");
+		WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, 0x80);
+		bcs->hw.hscx.rcvidx = 0;
+		return;
+	}
+	ptr = bcs->hw.hscx.rcvbuf + bcs->hw.hscx.rcvidx;
+	bcs->hw.hscx.rcvidx += count;
+	save_flags(flags);
+	cli();
+	READHSCXFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
+	WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, 0x80);
+	restore_flags(flags);
+	if (cs->debug & L1_DEB_HSCX_FIFO) {
+		char *t = bcs->blog;
+
+		t += sprintf(t, "hscx_empty_fifo %c cnt %d",
+			     bcs->hw.hscx.hscx ? 'B' : 'A', count);
+		QuickHex(t, ptr, count);
+		debugl1(cs, bcs->blog);
+	}
+}
+
+static void
+hscx_fill_fifo(struct BCState *bcs)
+{
+	struct IsdnCardState *cs = bcs->cs;
+	int more, count;
+	int fifo_size = test_bit(HW_IPAC, &cs->HW_Flags)? 64: 32;
+	u_char *ptr;
+	long flags;
+
+
+	if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
+		debugl1(cs, "hscx_fill_fifo");
+
+	if (!bcs->tx_skb)
+		return;
+	if (bcs->tx_skb->len <= 0)
+		return;
+
+	more = (bcs->mode == L1_MODE_TRANS) ? 1 : 0;
+	if (bcs->tx_skb->len > fifo_size) {
+		more = !0;
+		count = fifo_size;
+	} else
+		count = bcs->tx_skb->len;
+
+	waitforXFW(cs, bcs->hw.hscx.hscx);
+	save_flags(flags);
+	cli();
+	ptr = bcs->tx_skb->data;
+	skb_pull(bcs->tx_skb, count);
+	bcs->tx_cnt -= count;
+	bcs->hw.hscx.count += count;
+	WRITEHSCXFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
+	WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, more ? 0x8 : 0xa);
+	restore_flags(flags);
+	if (cs->debug & L1_DEB_HSCX_FIFO) {
+		char *t = bcs->blog;
+
+		t += sprintf(t, "hscx_fill_fifo %c cnt %d",
+			     bcs->hw.hscx.hscx ? 'B' : 'A', count);
+		QuickHex(t, ptr, count);
+		debugl1(cs, bcs->blog);
+	}
+}
+
+static inline void
+hscx_interrupt(struct IsdnCardState *cs, u_char val, u_char hscx)
+{
+	u_char r;
+	struct BCState *bcs = cs->bcs + hscx;
+	struct sk_buff *skb;
+	int fifo_size = test_bit(HW_IPAC, &cs->HW_Flags)? 64: 32;
+	int count;
+
+	if (!test_bit(BC_FLG_INIT, &bcs->Flag))
+		return;
+
+	if (val & 0x80) {	/* RME */
+		r = READHSCX(cs, hscx, HSCX_RSTA);
+		if ((r & 0xf0) != 0xa0) {
+			if (!(r & 0x80))
+				if (cs->debug & L1_DEB_WARN)
+					debugl1(cs, "HSCX invalid frame");
+			if ((r & 0x40) && bcs->mode)
+				if (cs->debug & L1_DEB_WARN)
+					debugl1(cs, "HSCX RDO mode=%d",
+						bcs->mode);
+			if (!(r & 0x20))
+				if (cs->debug & L1_DEB_WARN)
+					debugl1(cs, "HSCX CRC error");
+			WriteHSCXCMDR(cs, hscx, 0x80);
+		} else {
+			count = READHSCX(cs, hscx, HSCX_RBCL) & (
+				test_bit(HW_IPAC, &cs->HW_Flags)? 0x3f: 0x1f);
+			if (count == 0)
+				count = fifo_size;
+			hscx_empty_fifo(bcs, count);
+			if ((count = bcs->hw.hscx.rcvidx - 1) > 0) {
+				if (cs->debug & L1_DEB_HSCX_FIFO)
+					debugl1(cs, "HX Frame %d", count);
+				if (!(skb = dev_alloc_skb(count)))
+					printk(KERN_WARNING "HSCX: receive out of memory\n");
+				else {
+					SET_SKB_FREE(skb);
+					memcpy(skb_put(skb, count), bcs->hw.hscx.rcvbuf, count);
+					skb_queue_tail(&bcs->rqueue, skb);
+				}
+			}
+		}
+		bcs->hw.hscx.rcvidx = 0;
+		hscx_sched_event(bcs, B_RCVBUFREADY);
+	}
+	if (val & 0x40) {	/* RPF */
+		hscx_empty_fifo(bcs, fifo_size);
+		if (bcs->mode == L1_MODE_TRANS) {
+			/* receive audio data */
+			if (!(skb = dev_alloc_skb(fifo_size)))
+				printk(KERN_WARNING "HiSax: receive out of memory\n");
+			else {
+				SET_SKB_FREE(skb);
+				memcpy(skb_put(skb, fifo_size), bcs->hw.hscx.rcvbuf, fifo_size);
+				skb_queue_tail(&bcs->rqueue, skb);
+			}
+			bcs->hw.hscx.rcvidx = 0;
+			hscx_sched_event(bcs, B_RCVBUFREADY);
+		}
+	}
+	if (val & 0x10) {	/* XPR */
+		if (bcs->tx_skb) {
+			if (bcs->tx_skb->len) {
+				hscx_fill_fifo(bcs);
+				return;
+			} 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(bcs->tx_skb, FREE_WRITE);
+				bcs->hw.hscx.count = 0; 
+				bcs->tx_skb = NULL;
+			}
+		}
+		if ((bcs->tx_skb = skb_dequeue(&bcs->squeue))) {
+			bcs->hw.hscx.count = 0;
+			test_and_set_bit(BC_FLG_BUSY, &bcs->Flag);
+			hscx_fill_fifo(bcs);
+		} else {
+			test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
+			hscx_sched_event(bcs, B_XMTBUFREADY);
+		}
+	}
+}
+
+static inline void
+hscx_int_main(struct IsdnCardState *cs, u_char val)
+{
+
+	u_char exval;
+	struct BCState *bcs;
+
+	if (val & 0x01) {
+		bcs = cs->bcs + 1;
+		exval = READHSCX(cs, 1, HSCX_EXIR);
+		if (exval & 0x40) {
+			if (bcs->mode == 1)
+				hscx_fill_fifo(bcs);
+			else {
+				/* Here we lost an TX interrupt, so
+				   * restart transmitting the whole frame.
+				 */
+				if (bcs->tx_skb) {
+					skb_push(bcs->tx_skb, bcs->hw.hscx.count);
+					bcs->tx_cnt += bcs->hw.hscx.count;
+					bcs->hw.hscx.count = 0;
+				}
+				WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, 0x01);
+				if (cs->debug & L1_DEB_WARN)
+					debugl1(cs, "HSCX B EXIR %x Lost TX", exval);
+			}
+		} else if (cs->debug & L1_DEB_HSCX)
+			debugl1(cs, "HSCX B EXIR %x", exval);
+	}
+	if (val & 0xf8) {
+		if (cs->debug & L1_DEB_HSCX)
+			debugl1(cs, "HSCX B interrupt %x", val);
+		hscx_interrupt(cs, val, 1);
+	}
+	if (val & 0x02) {
+		bcs = cs->bcs;
+		exval = READHSCX(cs, 0, HSCX_EXIR);
+		if (exval & 0x40) {
+			if (bcs->mode == L1_MODE_TRANS)
+				hscx_fill_fifo(bcs);
+			else {
+				/* Here we lost an TX interrupt, so
+				   * restart transmitting the whole frame.
+				 */
+				if (bcs->tx_skb) {
+					skb_push(bcs->tx_skb, bcs->hw.hscx.count);
+					bcs->tx_cnt += bcs->hw.hscx.count;
+					bcs->hw.hscx.count = 0;
+				}
+				WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, 0x01);
+				if (cs->debug & L1_DEB_WARN)
+					debugl1(cs, "HSCX A EXIR %x Lost TX", exval);
+			}
+		} else if (cs->debug & L1_DEB_HSCX)
+			debugl1(cs, "HSCX A EXIR %x", exval);
+	}
+	if (val & 0x04) {
+		exval = READHSCX(cs, 0, HSCX_ISTA);
+		if (cs->debug & L1_DEB_HSCX)
+			debugl1(cs, "HSCX A interrupt %x", exval);
+		hscx_interrupt(cs, exval, 0);
+	}
+}