drivers/isdn/sc/packet.c

   1 /* $Id: packet.c,v 1.5.8.1 2001/09/23 22:24:59 kai Exp $
   2  *
   3  * Copyright (C) 1996  SpellCaster Telecommunications Inc.
   4  *
   5  * This software may be used and distributed according to the terms
   6  * of the GNU General Public License, incorporated herein by reference.
   7  *
   8  * For more information, please contact gpl-info@spellcast.com or write:
   9  *
  10  *     SpellCaster Telecommunications Inc.
  11  *     5621 Finch Avenue East, Unit #3
  12  *     Scarborough, Ontario  Canada
  13  *     M1B 2T9
  14  *     +1 (416) 297-8565
  15  *     +1 (416) 297-6433 Facsimile
  16  */
  17
  18 #include "includes.h"
  19 #include "hardware.h"
  20 #include "message.h"
  21 #include "card.h"
  22
  23 extern board *sc_adapter[];
  24 extern unsigned int cinst;
  25
  26 extern int get_card_from_id(int);
  27 extern int indicate_status(int, int,ulong, char*);
  28 extern void memcpy_toshmem(int, void *, const void *, size_t);
  29 extern void memcpy_fromshmem(int, void *, const void *, size_t);
  30 extern int sendmessage(int, unsigned int, unsigned int, unsigned int,
  31                 unsigned int, unsigned int, unsigned int, unsigned int *);
  32
  33 int sndpkt(int devId, int channel, struct sk_buff *data)
  34 {
  35         LLData  ReqLnkWrite;
  36         int status;
  37         int card;
  38         unsigned long len;
  39
  40         card = get_card_from_id(devId);
  41
  42         if(!IS_VALID_CARD(card)) {
  43                 pr_debug("invalid param: %d is not a valid card id\n", card);
  44                 return -ENODEV;
  45         }
  46
  47         pr_debug("%s: sndpkt: frst = 0x%x nxt = %d  f = %d n = %d\n",
  48                 sc_adapter[card]->devicename,
  49                 sc_adapter[card]->channel[channel].first_sendbuf,
  50                 sc_adapter[card]->channel[channel].next_sendbuf,
  51                 sc_adapter[card]->channel[channel].free_sendbufs,
  52                 sc_adapter[card]->channel[channel].num_sendbufs);
  53
  54         if(!sc_adapter[card]->channel[channel].free_sendbufs) {
  55                 pr_debug("%s: out of TX buffers\n",
  56                                 sc_adapter[card]->devicename);
  57                 return -EINVAL;
  58         }
  59
  60         if(data->len > BUFFER_SIZE) {
  61                 pr_debug("%s: data overflows buffer size (data > buffer)\n",
  62                         sc_adapter[card]->devicename);
  63                 return -EINVAL;
  64         }
  65
  66         ReqLnkWrite.buff_offset = sc_adapter[card]->channel[channel].next_sendbuf *
  67                 BUFFER_SIZE + sc_adapter[card]->channel[channel].first_sendbuf;
  68         ReqLnkWrite.msg_len = data->len; /* sk_buff size */
  69         pr_debug("%s: writing %d bytes to buffer offset 0x%x\n",
  70                         sc_adapter[card]->devicename,
  71                         ReqLnkWrite.msg_len, ReqLnkWrite.buff_offset);
  72         memcpy_toshmem(card, (char *)ReqLnkWrite.buff_offset, data->data, ReqLnkWrite.msg_len);
  73
  74         /*
  75          * sendmessage
  76          */
  77         pr_debug("%s: sndpkt size=%d, buf_offset=0x%x buf_indx=%d\n",
  78                 sc_adapter[card]->devicename,
  79                 ReqLnkWrite.msg_len, ReqLnkWrite.buff_offset,
  80                 sc_adapter[card]->channel[channel].next_sendbuf);
  81
  82         status = sendmessage(card, CEPID, ceReqTypeLnk, ceReqClass1, ceReqLnkWrite,
  83                                 channel+1, sizeof(LLData), (unsigned int*)&ReqLnkWrite);
  84         len = data->len;
  85         if(status) {
  86                 pr_debug("%s: failed to send packet, status = %d\n",
  87                                 sc_adapter[card]->devicename, status);
  88                 return -1;
  89         }
  90         else {
  91                 sc_adapter[card]->channel[channel].free_sendbufs--;
  92                 sc_adapter[card]->channel[channel].next_sendbuf =
  93                         ++sc_adapter[card]->channel[channel].next_sendbuf ==
  94                         sc_adapter[card]->channel[channel].num_sendbufs ? 0 :
  95                         sc_adapter[card]->channel[channel].next_sendbuf;
  96                         pr_debug("%s: packet sent successfully\n", sc_adapter[card]->devicename);
  97                 dev_kfree_skb(data);
  98                 indicate_status(card,ISDN_STAT_BSENT,channel, (char *)&len);
  99         }
 100         return len;
 101 }
 102
 103 void rcvpkt(int card, RspMessage *rcvmsg)
 104 {
 105         LLData newll;
 106         struct sk_buff *skb;
 107
 108         if(!IS_VALID_CARD(card)) {
 109                 pr_debug("invalid param: %d is not a valid card id\n", card);
 110                 return;
 111         }
 112
 113         switch(rcvmsg->rsp_status){
 114         case 0x01:
 115         case 0x02:
 116         case 0x70:
 117                 pr_debug("%s: error status code: 0x%x\n",
 118                         sc_adapter[card]->devicename, rcvmsg->rsp_status);
 119                 return;
 120         case 0x00:
 121             if (!(skb = dev_alloc_skb(rcvmsg->msg_data.response.msg_len))) {
 122                         printk(KERN_WARNING "%s: rcvpkt out of memory, dropping packet\n",
 123                                 sc_adapter[card]->devicename);
 124                         return;
 125                 }
 126                 skb_put(skb, rcvmsg->msg_data.response.msg_len);
 127                 pr_debug("%s: getting data from offset: 0x%x\n",
 128                         sc_adapter[card]->devicename,
 129                         rcvmsg->msg_data.response.buff_offset);
 130                 memcpy_fromshmem(card,
 131                         skb_put(skb, rcvmsg->msg_data.response.msg_len),
 132                         (char *)rcvmsg->msg_data.response.buff_offset,
 133                         rcvmsg->msg_data.response.msg_len);
 134                 sc_adapter[card]->card->rcvcallb_skb(sc_adapter[card]->driverId,
 135                         rcvmsg->phy_link_no-1, skb);
 136
 137         case 0x03:
 138                 /*
 139                  * Recycle the buffer
 140                  */
 141                 pr_debug("%s: buffer size : %d\n",
 142                                 sc_adapter[card]->devicename, BUFFER_SIZE);
 143 /*              memset_shmem(card, rcvmsg->msg_data.response.buff_offset, 0, BUFFER_SIZE); */
 144                 newll.buff_offset = rcvmsg->msg_data.response.buff_offset;
 145                 newll.msg_len = BUFFER_SIZE;
 146                 pr_debug("%s: recycled buffer at offset 0x%x size %d\n",
 147                         sc_adapter[card]->devicename,
 148                         newll.buff_offset, newll.msg_len);
 149                 sendmessage(card, CEPID, ceReqTypeLnk, ceReqClass1, ceReqLnkRead,
 150                         rcvmsg->phy_link_no, sizeof(LLData), (unsigned int *)&newll);
 151         }
 152
 153 }
 154
 155 int setup_buffers(int card, int c)
 156 {
 157         unsigned int nBuffers, i, cBase;
 158         unsigned int buffer_size;
 159         LLData  RcvBuffOffset;
 160
 161         if(!IS_VALID_CARD(card)) {
 162                 pr_debug("invalid param: %d is not a valid card id\n", card);
 163                 return -ENODEV;
 164         }
 165
 166         /*
 167          * Calculate the buffer offsets (send/recv/send/recv)
 168          */
 169         pr_debug("%s: setting up channel buffer space in shared RAM\n",
 170                         sc_adapter[card]->devicename);
 171         buffer_size = BUFFER_SIZE;
 172         nBuffers = ((sc_adapter[card]->ramsize - BUFFER_BASE) / buffer_size) / 2;
 173         nBuffers = nBuffers > BUFFERS_MAX ? BUFFERS_MAX : nBuffers;
 174         pr_debug("%s: calculating buffer space: %d buffers, %d big\n",
 175                 sc_adapter[card]->devicename,
 176                 nBuffers, buffer_size);
 177         if(nBuffers < 2) {
 178                 pr_debug("%s: not enough buffer space\n",
 179                         sc_adapter[card]->devicename);
 180                 return -1;
 181         }
 182         cBase = (nBuffers * buffer_size) * (c - 1);
 183         pr_debug("%s: channel buffer offset from shared RAM: 0x%x\n",
 184                         sc_adapter[card]->devicename, cBase);
 185         sc_adapter[card]->channel[c-1].first_sendbuf = BUFFER_BASE + cBase;
 186         sc_adapter[card]->channel[c-1].num_sendbufs = nBuffers / 2;
 187         sc_adapter[card]->channel[c-1].free_sendbufs = nBuffers / 2;
 188         sc_adapter[card]->channel[c-1].next_sendbuf = 0;
 189         pr_debug("%s: send buffer setup complete: first=0x%x n=%d f=%d, nxt=%d\n",
 190                                 sc_adapter[card]->devicename,
 191                                 sc_adapter[card]->channel[c-1].first_sendbuf,
 192                                 sc_adapter[card]->channel[c-1].num_sendbufs,
 193                                 sc_adapter[card]->channel[c-1].free_sendbufs,
 194                                 sc_adapter[card]->channel[c-1].next_sendbuf);
 195
 196         /*
 197          * Prep the receive buffers
 198          */
 199         pr_debug("%s: adding %d RecvBuffers:\n",
 200                         sc_adapter[card]->devicename, nBuffers /2);
 201         for (i = 0 ; i < nBuffers / 2; i++) {
 202                 RcvBuffOffset.buff_offset =
 203                         ((sc_adapter[card]->channel[c-1].first_sendbuf +
 204                         (nBuffers / 2) * buffer_size) + (buffer_size * i));
 205                 RcvBuffOffset.msg_len = buffer_size;
 206                 pr_debug("%s: adding RcvBuffer #%d offset=0x%x sz=%d bufsz:%d\n",
 207                                 sc_adapter[card]->devicename,
 208                                 i + 1, RcvBuffOffset.buff_offset,
 209                                 RcvBuffOffset.msg_len,buffer_size);
 210                 sendmessage(card, CEPID, ceReqTypeLnk, ceReqClass1, ceReqLnkRead,
 211                                 c, sizeof(LLData), (unsigned int *)&RcvBuffOffset);
 212         }
 213         return 0;
 214 }
 215