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 int sndpkt(int devId, int channel, int ack, struct sk_buff *data)
  24 {
  25         LLData  ReqLnkWrite;
  26         int status;
  27         int card;
  28         unsigned long len;
  29
  30         card = get_card_from_id(devId);
  31
  32         if (!IS_VALID_CARD(card)) {
  33                 pr_debug("invalid param: %d is not a valid card id\n", card);
  34                 return -ENODEV;
  35         }
  36
  37         pr_debug("%s: sndpkt: frst = 0x%lx nxt = %d  f = %d n = %d\n",
  38                  sc_adapter[card]->devicename,
  39                  sc_adapter[card]->channel[channel].first_sendbuf,
  40                  sc_adapter[card]->channel[channel].next_sendbuf,
  41                  sc_adapter[card]->channel[channel].free_sendbufs,
  42                  sc_adapter[card]->channel[channel].num_sendbufs);
  43
  44         if (!sc_adapter[card]->channel[channel].free_sendbufs) {
  45                 pr_debug("%s: out of TX buffers\n",
  46                          sc_adapter[card]->devicename);
  47                 return -EINVAL;
  48         }
  49
  50         if (data->len > BUFFER_SIZE) {
  51                 pr_debug("%s: data overflows buffer size (data > buffer)\n",
  52                          sc_adapter[card]->devicename);
  53                 return -EINVAL;
  54         }
  55
  56         ReqLnkWrite.buff_offset = sc_adapter[card]->channel[channel].next_sendbuf *
  57                 BUFFER_SIZE + sc_adapter[card]->channel[channel].first_sendbuf;
  58         ReqLnkWrite.msg_len = data->len; /* sk_buff size */
  59         pr_debug("%s: writing %d bytes to buffer offset 0x%lx\n",
  60                  sc_adapter[card]->devicename,
  61                  ReqLnkWrite.msg_len, ReqLnkWrite.buff_offset);
  62         memcpy_toshmem(card, (char *)ReqLnkWrite.buff_offset, data->data, ReqLnkWrite.msg_len);
  63
  64         /*
  65          * sendmessage
  66          */
  67         pr_debug("%s: sndpkt size=%d, buf_offset=0x%lx buf_indx=%d\n",
  68                  sc_adapter[card]->devicename,
  69                  ReqLnkWrite.msg_len, ReqLnkWrite.buff_offset,
  70                  sc_adapter[card]->channel[channel].next_sendbuf);
  71
  72         status = sendmessage(card, CEPID, ceReqTypeLnk, ceReqClass1, ceReqLnkWrite,
  73                              channel + 1, sizeof(LLData), (unsigned int *)&ReqLnkWrite);
  74         len = data->len;
  75         if (status) {
  76                 pr_debug("%s: failed to send packet, status = %d\n",
  77                          sc_adapter[card]->devicename, status);
  78                 return -1;
  79         }
  80         else {
  81                 sc_adapter[card]->channel[channel].free_sendbufs--;
  82                 sc_adapter[card]->channel[channel].next_sendbuf =
  83                         ++sc_adapter[card]->channel[channel].next_sendbuf ==
  84                         sc_adapter[card]->channel[channel].num_sendbufs ? 0 :
  85                         sc_adapter[card]->channel[channel].next_sendbuf;
  86                 pr_debug("%s: packet sent successfully\n", sc_adapter[card]->devicename);
  87                 dev_kfree_skb(data);
  88                 indicate_status(card, ISDN_STAT_BSENT, channel, (char *)&len);
  89         }
  90         return len;
  91 }
  92
  93 void rcvpkt(int card, RspMessage *rcvmsg)
  94 {
  95         LLData newll;
  96         struct sk_buff *skb;
  97
  98         if (!IS_VALID_CARD(card)) {
  99                 pr_debug("invalid param: %d is not a valid card id\n", card);
 100                 return;
 101         }
 102
 103         switch (rcvmsg->rsp_status) {
 104         case 0x01:
 105         case 0x02:
 106         case 0x70:
 107                 pr_debug("%s: error status code: 0x%x\n",
 108                          sc_adapter[card]->devicename, rcvmsg->rsp_status);
 109                 return;
 110         case 0x00:
 111                 if (!(skb = dev_alloc_skb(rcvmsg->msg_data.response.msg_len))) {
 112                         printk(KERN_WARNING "%s: rcvpkt out of memory, dropping packet\n",
 113                                sc_adapter[card]->devicename);
 114                         return;
 115                 }
 116                 skb_put(skb, rcvmsg->msg_data.response.msg_len);
 117                 pr_debug("%s: getting data from offset: 0x%lx\n",
 118                          sc_adapter[card]->devicename,
 119                          rcvmsg->msg_data.response.buff_offset);
 120                 memcpy_fromshmem(card,
 121                                  skb_put(skb, rcvmsg->msg_data.response.msg_len),
 122                                  (char *)rcvmsg->msg_data.response.buff_offset,
 123                                  rcvmsg->msg_data.response.msg_len);
 124                 sc_adapter[card]->card->rcvcallb_skb(sc_adapter[card]->driverId,
 125                                                      rcvmsg->phy_link_no - 1, skb);
 126
 127         case 0x03:
 128                 /*
 129                  * Recycle the buffer
 130                  */
 131                 pr_debug("%s: buffer size : %d\n",
 132                          sc_adapter[card]->devicename, BUFFER_SIZE);
 133 /*              memset_shmem(card, rcvmsg->msg_data.response.buff_offset, 0, BUFFER_SIZE); */
 134                 newll.buff_offset = rcvmsg->msg_data.response.buff_offset;
 135                 newll.msg_len = BUFFER_SIZE;
 136                 pr_debug("%s: recycled buffer at offset 0x%lx size %d\n",
 137                          sc_adapter[card]->devicename,
 138                          newll.buff_offset, newll.msg_len);
 139                 sendmessage(card, CEPID, ceReqTypeLnk, ceReqClass1, ceReqLnkRead,
 140                             rcvmsg->phy_link_no, sizeof(LLData), (unsigned int *)&newll);
 141         }
 142
 143 }
 144
 145 int setup_buffers(int card, int c)
 146 {
 147         unsigned int nBuffers, i, cBase;
 148         unsigned int buffer_size;
 149         LLData  RcvBuffOffset;
 150
 151         if (!IS_VALID_CARD(card)) {
 152                 pr_debug("invalid param: %d is not a valid card id\n", card);
 153                 return -ENODEV;
 154         }
 155
 156         /*
 157          * Calculate the buffer offsets (send/recv/send/recv)
 158          */
 159         pr_debug("%s: setting up channel buffer space in shared RAM\n",
 160                  sc_adapter[card]->devicename);
 161         buffer_size = BUFFER_SIZE;
 162         nBuffers = ((sc_adapter[card]->ramsize - BUFFER_BASE) / buffer_size) / 2;
 163         nBuffers = nBuffers > BUFFERS_MAX ? BUFFERS_MAX : nBuffers;
 164         pr_debug("%s: calculating buffer space: %d buffers, %d big\n",
 165                  sc_adapter[card]->devicename,
 166                  nBuffers, buffer_size);
 167         if (nBuffers < 2) {
 168                 pr_debug("%s: not enough buffer space\n",
 169                          sc_adapter[card]->devicename);
 170                 return -1;
 171         }
 172         cBase = (nBuffers * buffer_size) * (c - 1);
 173         pr_debug("%s: channel buffer offset from shared RAM: 0x%x\n",
 174                  sc_adapter[card]->devicename, cBase);
 175         sc_adapter[card]->channel[c - 1].first_sendbuf = BUFFER_BASE + cBase;
 176         sc_adapter[card]->channel[c - 1].num_sendbufs = nBuffers / 2;
 177         sc_adapter[card]->channel[c - 1].free_sendbufs = nBuffers / 2;
 178         sc_adapter[card]->channel[c - 1].next_sendbuf = 0;
 179         pr_debug("%s: send buffer setup complete: first=0x%lx n=%d f=%d, nxt=%d\n",
 180                  sc_adapter[card]->devicename,
 181                  sc_adapter[card]->channel[c - 1].first_sendbuf,
 182                  sc_adapter[card]->channel[c - 1].num_sendbufs,
 183                  sc_adapter[card]->channel[c - 1].free_sendbufs,
 184                  sc_adapter[card]->channel[c - 1].next_sendbuf);
 185
 186         /*
 187          * Prep the receive buffers
 188          */
 189         pr_debug("%s: adding %d RecvBuffers:\n",
 190                  sc_adapter[card]->devicename, nBuffers / 2);
 191         for (i = 0; i < nBuffers / 2; i++) {
 192                 RcvBuffOffset.buff_offset =
 193                         ((sc_adapter[card]->channel[c - 1].first_sendbuf +
 194                           (nBuffers / 2) * buffer_size) + (buffer_size * i));
 195                 RcvBuffOffset.msg_len = buffer_size;
 196                 pr_debug("%s: adding RcvBuffer #%d offset=0x%lx sz=%d bufsz:%d\n",
 197                          sc_adapter[card]->devicename,
 198                          i + 1, RcvBuffOffset.buff_offset,
 199                          RcvBuffOffset.msg_len, buffer_size);
 200                 sendmessage(card, CEPID, ceReqTypeLnk, ceReqClass1, ceReqLnkRead,
 201                             c, sizeof(LLData), (unsigned int *)&RcvBuffOffset);
 202         }
 203         return 0;
 204 }