237 lines
6.2 KiB
C
237 lines
6.2 KiB
C
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/* $Id: jade_irq.c,v 1.7.2.4 2004/02/11 13:21:34 keil Exp $
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*
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* Low level JADE IRQ stuff (derived from original hscx_irq.c)
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*
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* Author Roland Klabunde
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* Copyright by Roland Klabunde <R.Klabunde@Berkom.de>
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*
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* This software may be used and distributed according to the terms
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* of the GNU General Public License, incorporated herein by reference.
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*
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*/
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static inline void
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waitforCEC(struct IsdnCardState *cs, int jade, int reg)
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{
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int to = 50;
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int mask = (reg == jade_HDLC_XCMD ? jadeSTAR_XCEC : jadeSTAR_RCEC);
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while ((READJADE(cs, jade, jade_HDLC_STAR) & mask) && to) {
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udelay(1);
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to--;
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}
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if (!to)
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printk(KERN_WARNING "HiSax: waitforCEC (jade) timeout\n");
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}
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static inline void
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waitforXFW(struct IsdnCardState *cs, int jade)
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{
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/* Does not work on older jade versions, don't care */
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}
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static inline void
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WriteJADECMDR(struct IsdnCardState *cs, int jade, int reg, u_char data)
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{
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waitforCEC(cs, jade, reg);
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WRITEJADE(cs, jade, reg, data);
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}
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static void
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jade_empty_fifo(struct BCState *bcs, int count)
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{
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u_char *ptr;
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struct IsdnCardState *cs = bcs->cs;
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if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
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debugl1(cs, "jade_empty_fifo");
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if (bcs->hw.hscx.rcvidx + count > HSCX_BUFMAX) {
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if (cs->debug & L1_DEB_WARN)
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debugl1(cs, "jade_empty_fifo: incoming packet too large");
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WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_RCMD, jadeRCMD_RMC);
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bcs->hw.hscx.rcvidx = 0;
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return;
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}
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ptr = bcs->hw.hscx.rcvbuf + bcs->hw.hscx.rcvidx;
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bcs->hw.hscx.rcvidx += count;
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READJADEFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
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WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_RCMD, jadeRCMD_RMC);
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if (cs->debug & L1_DEB_HSCX_FIFO) {
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char *t = bcs->blog;
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t += sprintf(t, "jade_empty_fifo %c cnt %d",
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bcs->hw.hscx.hscx ? 'B' : 'A', count);
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QuickHex(t, ptr, count);
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debugl1(cs, bcs->blog);
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}
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}
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static void
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jade_fill_fifo(struct BCState *bcs)
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{
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struct IsdnCardState *cs = bcs->cs;
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int more, count;
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int fifo_size = 32;
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u_char *ptr;
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if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
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debugl1(cs, "jade_fill_fifo");
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if (!bcs->tx_skb)
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return;
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if (bcs->tx_skb->len <= 0)
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return;
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more = (bcs->mode == L1_MODE_TRANS) ? 1 : 0;
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if (bcs->tx_skb->len > fifo_size) {
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more = !0;
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count = fifo_size;
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} else
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count = bcs->tx_skb->len;
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waitforXFW(cs, bcs->hw.hscx.hscx);
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ptr = bcs->tx_skb->data;
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skb_pull(bcs->tx_skb, count);
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bcs->tx_cnt -= count;
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bcs->hw.hscx.count += count;
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WRITEJADEFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
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WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_XCMD, more ? jadeXCMD_XF : (jadeXCMD_XF|jadeXCMD_XME));
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if (cs->debug & L1_DEB_HSCX_FIFO) {
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char *t = bcs->blog;
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t += sprintf(t, "jade_fill_fifo %c cnt %d",
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bcs->hw.hscx.hscx ? 'B' : 'A', count);
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QuickHex(t, ptr, count);
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debugl1(cs, bcs->blog);
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}
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}
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static void
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jade_interrupt(struct IsdnCardState *cs, u_char val, u_char jade)
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{
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u_char r;
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struct BCState *bcs = cs->bcs + jade;
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struct sk_buff *skb;
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int fifo_size = 32;
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int count;
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int i_jade = (int) jade; /* To satisfy the compiler */
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if (!test_bit(BC_FLG_INIT, &bcs->Flag))
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return;
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if (val & 0x80) { /* RME */
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r = READJADE(cs, i_jade, jade_HDLC_RSTA);
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if ((r & 0xf0) != 0xa0) {
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if (!(r & 0x80))
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if (cs->debug & L1_DEB_WARN)
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debugl1(cs, "JADE %s invalid frame", (jade ? "B":"A"));
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if ((r & 0x40) && bcs->mode)
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if (cs->debug & L1_DEB_WARN)
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debugl1(cs, "JADE %c RDO mode=%d", 'A'+jade, bcs->mode);
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if (!(r & 0x20))
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if (cs->debug & L1_DEB_WARN)
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debugl1(cs, "JADE %c CRC error", 'A'+jade);
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WriteJADECMDR(cs, jade, jade_HDLC_RCMD, jadeRCMD_RMC);
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} else {
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count = READJADE(cs, i_jade, jade_HDLC_RBCL) & 0x1F;
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if (count == 0)
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count = fifo_size;
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jade_empty_fifo(bcs, count);
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if ((count = bcs->hw.hscx.rcvidx - 1) > 0) {
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if (cs->debug & L1_DEB_HSCX_FIFO)
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debugl1(cs, "HX Frame %d", count);
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if (!(skb = dev_alloc_skb(count)))
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printk(KERN_WARNING "JADE %s receive out of memory\n", (jade ? "B":"A"));
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else {
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memcpy(skb_put(skb, count), bcs->hw.hscx.rcvbuf, count);
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skb_queue_tail(&bcs->rqueue, skb);
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}
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}
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}
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bcs->hw.hscx.rcvidx = 0;
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schedule_event(bcs, B_RCVBUFREADY);
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}
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if (val & 0x40) { /* RPF */
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jade_empty_fifo(bcs, fifo_size);
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if (bcs->mode == L1_MODE_TRANS) {
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/* receive audio data */
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if (!(skb = dev_alloc_skb(fifo_size)))
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printk(KERN_WARNING "HiSax: receive out of memory\n");
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else {
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memcpy(skb_put(skb, fifo_size), bcs->hw.hscx.rcvbuf, fifo_size);
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skb_queue_tail(&bcs->rqueue, skb);
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}
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bcs->hw.hscx.rcvidx = 0;
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schedule_event(bcs, B_RCVBUFREADY);
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}
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}
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if (val & 0x10) { /* XPR */
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if (bcs->tx_skb) {
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if (bcs->tx_skb->len) {
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jade_fill_fifo(bcs);
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return;
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} else {
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if (test_bit(FLG_LLI_L1WAKEUP,&bcs->st->lli.flag) &&
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(PACKET_NOACK != bcs->tx_skb->pkt_type)) {
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u_long flags;
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spin_lock_irqsave(&bcs->aclock, flags);
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bcs->ackcnt += bcs->hw.hscx.count;
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spin_unlock_irqrestore(&bcs->aclock, flags);
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schedule_event(bcs, B_ACKPENDING);
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}
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dev_kfree_skb_irq(bcs->tx_skb);
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bcs->hw.hscx.count = 0;
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bcs->tx_skb = NULL;
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}
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}
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if ((bcs->tx_skb = skb_dequeue(&bcs->squeue))) {
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bcs->hw.hscx.count = 0;
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test_and_set_bit(BC_FLG_BUSY, &bcs->Flag);
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jade_fill_fifo(bcs);
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} else {
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test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
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schedule_event(bcs, B_XMTBUFREADY);
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}
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}
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}
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static inline void
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jade_int_main(struct IsdnCardState *cs, u_char val, int jade)
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{
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struct BCState *bcs;
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bcs = cs->bcs + jade;
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if (val & jadeISR_RFO) {
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/* handled with RDO */
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val &= ~jadeISR_RFO;
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}
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if (val & jadeISR_XDU) {
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/* relevant in HDLC mode only */
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/* don't reset XPR here */
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if (bcs->mode == 1)
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jade_fill_fifo(bcs);
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else {
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/* Here we lost an TX interrupt, so
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* restart transmitting the whole frame.
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*/
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if (bcs->tx_skb) {
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skb_push(bcs->tx_skb, bcs->hw.hscx.count);
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bcs->tx_cnt += bcs->hw.hscx.count;
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bcs->hw.hscx.count = 0;
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}
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WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_XCMD, jadeXCMD_XRES);
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if (cs->debug & L1_DEB_WARN)
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debugl1(cs, "JADE %c EXIR %x Lost TX", 'A'+jade, val);
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}
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}
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if (val & (jadeISR_RME|jadeISR_RPF|jadeISR_XPR)) {
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if (cs->debug & L1_DEB_HSCX)
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debugl1(cs, "JADE %c interrupt %x", 'A'+jade, val);
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jade_interrupt(cs, val, jade);
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}
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}
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