/* $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 * * 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, "%s", 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, "%s", 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 { 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 */ 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 { 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) { 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); } }