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   1 /* $Id: jade_irq.c,v 1.7.2.4 2004/02/11 13:21:34 keil Exp $
   2  *
   3  * Low level JADE IRQ stuff (derived from original hscx_irq.c)
   4  *
   5  * Author       Roland Klabunde
   6  * Copyright    by Roland Klabunde   <R.Klabunde@Berkom.de>
   7  *
   8  * This software may be used and distributed according to the terms
   9  * of the GNU General Public License, incorporated herein by reference.
  10  *
  11  */
  12
  13 static inline void
  14 waitforCEC(struct IsdnCardState *cs, int jade, int reg)
  15 {
  16         int to = 50;
  17         int mask = (reg == jade_HDLC_XCMD ? jadeSTAR_XCEC : jadeSTAR_RCEC);
  18         while ((READJADE(cs, jade, jade_HDLC_STAR) & mask) && to) {
  19                 udelay(1);
  20                 to--;
  21         }
  22         if (!to)
  23                 printk(KERN_WARNING "HiSax: waitforCEC (jade) timeout\n");
  24 }
  25
  26
  27 static inline void
  28 waitforXFW(struct IsdnCardState *cs, int jade)
  29 {
  30         /* Does not work on older jade versions, don't care */
  31 }
  32
  33 static inline void
  34 WriteJADECMDR(struct IsdnCardState *cs, int jade, int reg, u_char data)
  35 {
  36         waitforCEC(cs, jade, reg);
  37         WRITEJADE(cs, jade, reg, data);
  38 }
  39
  40
  41
  42 static void
  43 jade_empty_fifo(struct BCState *bcs, int count)
  44 {
  45         u_char *ptr;
  46         struct IsdnCardState *cs = bcs->cs;
  47
  48         if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
  49                 debugl1(cs, "jade_empty_fifo");
  50
  51         if (bcs->hw.hscx.rcvidx + count > HSCX_BUFMAX) {
  52                 if (cs->debug & L1_DEB_WARN)
  53                         debugl1(cs, "jade_empty_fifo: incoming packet too large");
  54                 WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_RCMD, jadeRCMD_RMC);
  55                 bcs->hw.hscx.rcvidx = 0;
  56                 return;
  57         }
  58         ptr = bcs->hw.hscx.rcvbuf + bcs->hw.hscx.rcvidx;
  59         bcs->hw.hscx.rcvidx += count;
  60         READJADEFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
  61         WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_RCMD, jadeRCMD_RMC);
  62         if (cs->debug & L1_DEB_HSCX_FIFO) {
  63                 char *t = bcs->blog;
  64
  65                 t += sprintf(t, "jade_empty_fifo %c cnt %d",
  66                              bcs->hw.hscx.hscx ? 'B' : 'A', count);
  67                 QuickHex(t, ptr, count);
  68                 debugl1(cs, bcs->blog);
  69         }
  70 }
  71
  72 static void
  73 jade_fill_fifo(struct BCState *bcs)
  74 {
  75         struct IsdnCardState *cs = bcs->cs;
  76         int more, count;
  77         int fifo_size = 32;
  78         u_char *ptr;
  79
  80         if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
  81                 debugl1(cs, "jade_fill_fifo");
  82
  83         if (!bcs->tx_skb)
  84                 return;
  85         if (bcs->tx_skb->len <= 0)
  86                 return;
  87
  88         more = (bcs->mode == L1_MODE_TRANS) ? 1 : 0;
  89         if (bcs->tx_skb->len > fifo_size) {
  90                 more = !0;
  91                 count = fifo_size;
  92         } else
  93                 count = bcs->tx_skb->len;
  94
  95         waitforXFW(cs, bcs->hw.hscx.hscx);
  96         ptr = bcs->tx_skb->data;
  97         skb_pull(bcs->tx_skb, count);
  98         bcs->tx_cnt -= count;
  99         bcs->hw.hscx.count += count;
 100         WRITEJADEFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
 101         WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_XCMD, more ? jadeXCMD_XF : (jadeXCMD_XF|jadeXCMD_XME));
 102         if (cs->debug & L1_DEB_HSCX_FIFO) {
 103                 char *t = bcs->blog;
 104
 105                 t += sprintf(t, "jade_fill_fifo %c cnt %d",
 106                              bcs->hw.hscx.hscx ? 'B' : 'A', count);
 107                 QuickHex(t, ptr, count);
 108                 debugl1(cs, bcs->blog);
 109         }
 110 }
 111
 112
 113 static inline void
 114 jade_interrupt(struct IsdnCardState *cs, u_char val, u_char jade)
 115 {
 116         u_char r;
 117         struct BCState *bcs = cs->bcs + jade;
 118         struct sk_buff *skb;
 119         int fifo_size = 32;
 120         int count;
 121         int i_jade = (int) jade; /* To satisfy the compiler */
 122
 123         if (!test_bit(BC_FLG_INIT, &bcs->Flag))
 124                 return;
 125
 126         if (val & 0x80) {       /* RME */
 127                 r = READJADE(cs, i_jade, jade_HDLC_RSTA);
 128                 if ((r & 0xf0) != 0xa0) {
 129                         if (!(r & 0x80))
 130                                 if (cs->debug & L1_DEB_WARN)
 131                                         debugl1(cs, "JADE %s invalid frame", (jade ? "B":"A"));
 132                         if ((r & 0x40) && bcs->mode)
 133                                 if (cs->debug & L1_DEB_WARN)
 134                                         debugl1(cs, "JADE %c RDO mode=%d", 'A'+jade, bcs->mode);
 135                         if (!(r & 0x20))
 136                                 if (cs->debug & L1_DEB_WARN)
 137                                         debugl1(cs, "JADE %c CRC error", 'A'+jade);
 138                         WriteJADECMDR(cs, jade, jade_HDLC_RCMD, jadeRCMD_RMC);
 139                 } else {
 140                         count = READJADE(cs, i_jade, jade_HDLC_RBCL) & 0x1F;
 141                         if (count == 0)
 142                                 count = fifo_size;
 143                         jade_empty_fifo(bcs, count);
 144                         if ((count = bcs->hw.hscx.rcvidx - 1) > 0) {
 145                                 if (cs->debug & L1_DEB_HSCX_FIFO)
 146                                         debugl1(cs, "HX Frame %d", count);
 147                                 if (!(skb = dev_alloc_skb(count)))
 148                                         printk(KERN_WARNING "JADE %s receive out of memory\n", (jade ? "B":"A"));
 149                                 else {
 150                                         memcpy(skb_put(skb, count), bcs->hw.hscx.rcvbuf, count);
 151                                         skb_queue_tail(&bcs->rqueue, skb);
 152                                 }
 153                         }
 154                 }
 155                 bcs->hw.hscx.rcvidx = 0;
 156                 schedule_event(bcs, B_RCVBUFREADY);
 157         }
 158         if (val & 0x40) {       /* RPF */
 159                 jade_empty_fifo(bcs, fifo_size);
 160                 if (bcs->mode == L1_MODE_TRANS) {
 161                         /* receive audio data */
 162                         if (!(skb = dev_alloc_skb(fifo_size)))
 163                                 printk(KERN_WARNING "HiSax: receive out of memory\n");
 164                         else {
 165                                 memcpy(skb_put(skb, fifo_size), bcs->hw.hscx.rcvbuf, fifo_size);
 166                                 skb_queue_tail(&bcs->rqueue, skb);
 167                         }
 168                         bcs->hw.hscx.rcvidx = 0;
 169                         schedule_event(bcs, B_RCVBUFREADY);
 170                 }
 171         }
 172         if (val & 0x10) {       /* XPR */
 173                 if (bcs->tx_skb) {
 174                         if (bcs->tx_skb->len) {
 175                                 jade_fill_fifo(bcs);
 176                                 return;
 177                         } else {
 178                                 if (test_bit(FLG_LLI_L1WAKEUP,&bcs->st->lli.flag) &&
 179                                         (PACKET_NOACK != bcs->tx_skb->pkt_type)) {
 180                                         u_long  flags;
 181                                         spin_lock_irqsave(&bcs->aclock, flags);
 182                                         bcs->ackcnt += bcs->hw.hscx.count;
 183                                         spin_unlock_irqrestore(&bcs->aclock, flags);
 184                                         schedule_event(bcs, B_ACKPENDING);
 185                                 }
 186                                 dev_kfree_skb_irq(bcs->tx_skb);
 187                                 bcs->hw.hscx.count = 0;
 188                                 bcs->tx_skb = NULL;
 189                         }
 190                 }
 191                 if ((bcs->tx_skb = skb_dequeue(&bcs->squeue))) {
 192                         bcs->hw.hscx.count = 0;
 193                         test_and_set_bit(BC_FLG_BUSY, &bcs->Flag);
 194                         jade_fill_fifo(bcs);
 195                 } else {
 196                         test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
 197                         schedule_event(bcs, B_XMTBUFREADY);
 198                 }
 199         }
 200 }
 201
 202 static inline void
 203 jade_int_main(struct IsdnCardState *cs, u_char val, int jade)
 204 {
 205         struct BCState *bcs;
 206         bcs = cs->bcs + jade;
 207
 208         if (val & jadeISR_RFO) {
 209                 /* handled with RDO */
 210                 val &= ~jadeISR_RFO;
 211         }
 212         if (val & jadeISR_XDU) {
 213                 /* relevant in HDLC mode only */
 214                 /* don't reset XPR here */
 215                 if (bcs->mode == 1)
 216                         jade_fill_fifo(bcs);
 217                 else {
 218                         /* Here we lost an TX interrupt, so
 219                            * restart transmitting the whole frame.
 220                          */
 221                         if (bcs->tx_skb) {
 222                                 skb_push(bcs->tx_skb, bcs->hw.hscx.count);
 223                                 bcs->tx_cnt += bcs->hw.hscx.count;
 224                                 bcs->hw.hscx.count = 0;
 225                         }
 226                         WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_XCMD, jadeXCMD_XRES);
 227                         if (cs->debug & L1_DEB_WARN)
 228                                 debugl1(cs, "JADE %c EXIR %x Lost TX", 'A'+jade, val);
 229                 }
 230         }
 231         if (val & (jadeISR_RME|jadeISR_RPF|jadeISR_XPR)) {
 232                 if (cs->debug & L1_DEB_HSCX)
 233                         debugl1(cs, "JADE %c interrupt %x", 'A'+jade, val);
 234                 jade_interrupt(cs, val, jade);
 235         }
 236 }