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path: root/drivers/isdn/hisax/hscx_irq.c
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Diffstat (limited to 'drivers/isdn/hisax/hscx_irq.c')
-rw-r--r--drivers/isdn/hisax/hscx_irq.c292
1 files changed, 292 insertions, 0 deletions
diff --git a/drivers/isdn/hisax/hscx_irq.c b/drivers/isdn/hisax/hscx_irq.c
new file mode 100644
index 00000000..f398d483
--- /dev/null
+++ b/drivers/isdn/hisax/hscx_irq.c
@@ -0,0 +1,292 @@
+/* $Id: hscx_irq.c,v 1.18.2.3 2004/02/11 13:21:34 keil Exp $
+ *
+ * low level b-channel stuff for Siemens HSCX
+ *
+ * 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.
+ *
+ * This is an include file for fast inline IRQ stuff
+ *
+ */
+
+
+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)
+{
+ waitforCEC(cs, hscx);
+ WRITEHSCX(cs, hscx, HSCX_CMDR, data);
+}
+
+
+
+static void
+hscx_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, "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;
+ READHSCXFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
+ WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, 0x80);
+ 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;
+
+ 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);
+ 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);
+ 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 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");
+#ifdef ERROR_STATISTIC
+ bcs->err_inv++;
+#endif
+ }
+ if ((r & 0x40) && bcs->mode) {
+ if (cs->debug & L1_DEB_WARN)
+ debugl1(cs, "HSCX RDO mode=%d",
+ bcs->mode);
+#ifdef ERROR_STATISTIC
+ bcs->err_rdo++;
+#endif
+ }
+ if (!(r & 0x20)) {
+ if (cs->debug & L1_DEB_WARN)
+ debugl1(cs, "HSCX CRC error");
+#ifdef ERROR_STATISTIC
+ bcs->err_crc++;
+#endif
+ }
+ 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 {
+ 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 */
+ 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 {
+ 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) {
+ hscx_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);
+ hscx_fill_fifo(bcs);
+ } else {
+ test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
+ schedule_event(bcs, B_XMTBUFREADY);
+ }
+ }
+}
+
+static 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 {
+#ifdef ERROR_STATISTIC
+ bcs->err_tx++;
+#endif
+ /* 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.
+ */
+#ifdef ERROR_STATISTIC
+ bcs->err_tx++;
+#endif
+ 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);
+ }
+}
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