diff options
Diffstat (limited to 'drivers/isdn/hisax/jade_irq.c')
| -rw-r--r-- | drivers/isdn/hisax/jade_irq.c | 238 |
1 files changed, 238 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..a89e2df91 --- /dev/null +++ b/drivers/isdn/hisax/jade_irq.c @@ -0,0 +1,238 @@ +/* $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 { + skb_put_data(skb, 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 { + skb_put_data(skb, 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); + } +} |