Initial import

1 files changed, 236 insertions, 0 deletions

diff --git a/drivers/isdn/hisax/jade_irq.c b/drivers/isdn/hisax/jade_irq.c
new file mode 100644
index 000000000..b930da9b5
--- /dev/null
+++ b/drivers/isdn/hisax/jade_irq.c
@@ -0,0 +1,236 @@
+/* $Id: jade_irq.c,v 1.7.2.4 2004/02/11 13:21:34 keil Exp $
+ *
+ * Low level JADE IRQ stuff (derived from original hscx_irq.c)
+ *
+ * Author       Roland Klabunde
+ * Copyright    by Roland Klabunde   <R.Klabunde@Berkom.de>
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ */
+
+static inline void
+waitforCEC(struct IsdnCardState *cs, int jade, int reg)
+{
+	int to = 50;
+	int mask = (reg == jade_HDLC_XCMD ? jadeSTAR_XCEC : jadeSTAR_RCEC);
+	while ((READJADE(cs, jade, jade_HDLC_STAR) & mask) && to) {
+		udelay(1);
+		to--;
+	}
+	if (!to)
+		printk(KERN_WARNING "HiSax: waitforCEC (jade) timeout\n");
+}
+
+
+static inline void
+waitforXFW(struct IsdnCardState *cs, int jade)
+{
+	/* Does not work on older jade versions, don't care */
+}
+
+static inline void
+WriteJADECMDR(struct IsdnCardState *cs, int jade, int reg, u_char data)
+{
+	waitforCEC(cs, jade, reg);
+	WRITEJADE(cs, jade, reg, data);
+}
+
+
+
+static void
+jade_empty_fifo(struct BCState *bcs, int count)
+{
+	u_char *ptr;
+	struct IsdnCardState *cs = bcs->cs;
+
+	if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
+		debugl1(cs, "jade_empty_fifo");
+
+	if (bcs->hw.hscx.rcvidx + count > HSCX_BUFMAX) {
+		if (cs->debug & L1_DEB_WARN)
+			debugl1(cs, "jade_empty_fifo: incoming packet too large");
+		WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_RCMD, jadeRCMD_RMC);
+		bcs->hw.hscx.rcvidx = 0;
+		return;
+	}
+	ptr = bcs->hw.hscx.rcvbuf + bcs->hw.hscx.rcvidx;
+	bcs->hw.hscx.rcvidx += count;
+	READJADEFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
+	WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_RCMD, jadeRCMD_RMC);
+	if (cs->debug & L1_DEB_HSCX_FIFO) {
+		char *t = bcs->blog;
+
+		t += sprintf(t, "jade_empty_fifo %c cnt %d",
+			     bcs->hw.hscx.hscx ? 'B' : 'A', count);
+		QuickHex(t, ptr, count);
+		debugl1(cs, "%s", bcs->blog);
+	}
+}
+
+static void
+jade_fill_fifo(struct BCState *bcs)
+{
+	struct IsdnCardState *cs = bcs->cs;
+	int more, count;
+	int fifo_size = 32;
+	u_char *ptr;
+
+	if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
+		debugl1(cs, "jade_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);
+	ptr = bcs->tx_skb->data;
+	skb_pull(bcs->tx_skb, count);
+	bcs->tx_cnt -= count;
+	bcs->hw.hscx.count += count;
+	WRITEJADEFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
+	WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_XCMD, more ? jadeXCMD_XF : (jadeXCMD_XF | jadeXCMD_XME));
+	if (cs->debug & L1_DEB_HSCX_FIFO) {
+		char *t = bcs->blog;
+
+		t += sprintf(t, "jade_fill_fifo %c cnt %d",
+			     bcs->hw.hscx.hscx ? 'B' : 'A', count);
+		QuickHex(t, ptr, count);
+		debugl1(cs, "%s", bcs->blog);
+	}
+}
+
+
+static void
+jade_interrupt(struct IsdnCardState *cs, u_char val, u_char jade)
+{
+	u_char r;
+	struct BCState *bcs = cs->bcs + jade;
+	struct sk_buff *skb;
+	int fifo_size = 32;
+	int count;
+	int i_jade = (int) jade; /* To satisfy the compiler */
+
+	if (!test_bit(BC_FLG_INIT, &bcs->Flag))
+		return;
+
+	if (val & 0x80) {	/* RME */
+		r = READJADE(cs, i_jade, jade_HDLC_RSTA);
+		if ((r & 0xf0) != 0xa0) {
+			if (!(r & 0x80))
+				if (cs->debug & L1_DEB_WARN)
+					debugl1(cs, "JADE %s invalid frame", (jade ? "B" : "A"));
+			if ((r & 0x40) && bcs->mode)
+				if (cs->debug & L1_DEB_WARN)
+					debugl1(cs, "JADE %c RDO mode=%d", 'A' + jade, bcs->mode);
+			if (!(r & 0x20))
+				if (cs->debug & L1_DEB_WARN)
+					debugl1(cs, "JADE %c CRC error", 'A' + jade);
+			WriteJADECMDR(cs, jade, jade_HDLC_RCMD, jadeRCMD_RMC);
+		} else {
+			count = READJADE(cs, i_jade, jade_HDLC_RBCL) & 0x1F;
+			if (count == 0)
+				count = fifo_size;
+			jade_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 "JADE %s receive out of memory\n", (jade ? "B" : "A"));
+				else {
+					memcpy(skb_put(skb, count), bcs->hw.hscx.rcvbuf, count);
+					skb_queue_tail(&bcs->rqueue, skb);
+				}
+			}
+		}
+		bcs->hw.hscx.rcvidx = 0;
+		schedule_event(bcs, B_RCVBUFREADY);
+	}
+	if (val & 0x40) {	/* RPF */
+		jade_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 {
+				memcpy(skb_put(skb, fifo_size), bcs->hw.hscx.rcvbuf, fifo_size);
+				skb_queue_tail(&bcs->rqueue, skb);
+			}
+			bcs->hw.hscx.rcvidx = 0;
+			schedule_event(bcs, B_RCVBUFREADY);
+		}
+	}
+	if (val & 0x10) {	/* XPR */
+		if (bcs->tx_skb) {
+			if (bcs->tx_skb->len) {
+				jade_fill_fifo(bcs);
+				return;
+			} else {
+				if (test_bit(FLG_LLI_L1WAKEUP, &bcs->st->lli.flag) &&
+				    (PACKET_NOACK != bcs->tx_skb->pkt_type)) {
+					u_long	flags;
+					spin_lock_irqsave(&bcs->aclock, flags);
+					bcs->ackcnt += bcs->hw.hscx.count;
+					spin_unlock_irqrestore(&bcs->aclock, flags);
+					schedule_event(bcs, B_ACKPENDING);
+				}
+				dev_kfree_skb_irq(bcs->tx_skb);
+				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);
+			jade_fill_fifo(bcs);
+		} else {
+			test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
+			schedule_event(bcs, B_XMTBUFREADY);
+		}
+	}
+}
+
+static inline void
+jade_int_main(struct IsdnCardState *cs, u_char val, int jade)
+{
+	struct BCState *bcs;
+	bcs = cs->bcs + jade;
+
+	if (val & jadeISR_RFO) {
+		/* handled with RDO */
+		val &= ~jadeISR_RFO;
+	}
+	if (val & jadeISR_XDU) {
+		/* relevant in HDLC mode only */
+		/* don't reset XPR here */
+		if (bcs->mode == 1)
+			jade_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;
+			}
+			WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_XCMD, jadeXCMD_XRES);
+			if (cs->debug & L1_DEB_WARN)
+				debugl1(cs, "JADE %c EXIR %x Lost TX", 'A' + jade, val);
+		}
+	}
+	if (val & (jadeISR_RME | jadeISR_RPF | jadeISR_XPR)) {
+		if (cs->debug & L1_DEB_HSCX)
+			debugl1(cs, "JADE %c interrupt %x", 'A' + jade, val);
+		jade_interrupt(cs, val, jade);
+	}
+}