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Diffstat (limited to 'drivers/isdn/hisax/jade_irq.c')
-rw-r--r--drivers/isdn/hisax/jade_irq.c247
1 files changed, 247 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..9cfcc7d6d
--- /dev/null
+++ b/drivers/isdn/hisax/jade_irq.c
@@ -0,0 +1,247 @@
+/* $Id: jade_irq.c,v 1.2 1999/07/01 08:07:59 keil Exp $
+ *
+ * jade_irq.c Low level JADE IRQ stuff (derived from original hscx_irq.c)
+ *
+ * Author Roland Klabunde (R.Klabunde@Berkom.de)
+ *
+ * $Log: jade_irq.c,v $
+ * Revision 1.2 1999/07/01 08:07:59 keil
+ * Initial version
+ *
+ *
+ */
+
+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)
+{
+ long flags;
+
+ save_flags(flags);
+ cli();
+ waitforCEC(cs, jade, reg);
+ WRITEJADE(cs, jade, reg, data);
+ restore_flags(flags);
+}
+
+
+
+static void
+jade_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, "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;
+ save_flags(flags);
+ cli();
+ READJADEFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
+ WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_RCMD, jadeRCMD_RMC);
+ restore_flags(flags);
+ 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, 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;
+ long flags;
+
+ 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);
+ save_flags(flags);
+ cli();
+ 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));
+ restore_flags(flags);
+ 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, bcs->blog);
+ }
+}
+
+
+static inline 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 {
+ 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;
+ jade_sched_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 {
+ 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;
+ jade_sched_event(bcs, B_RCVBUFREADY);
+ }
+ }
+ if (val & 0x10) { /* XPR */
+ if (bcs->tx_skb) {
+ if (bcs->tx_skb->len) {
+ jade_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);
+ idev_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);
+ jade_fill_fifo(bcs);
+ } else {
+ test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
+ jade_sched_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);
+ }
+}
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