drivers/scsi/pcmcia/nsp_message.c

   1 /*==========================================================================
   2   NinjaSCSI-3 message handler
   3       By: YOKOTA Hiroshi <yokota@netlab.is.tsukuba.ac.jp>
   4
   5    This software may be used and distributed according to the terms of
   6    the GNU General Public License.
   7  */
   8
   9 /* $Id: nsp_message.c,v 1.6 2003/07/26 14:21:09 elca Exp $ */
  10
  11 static void nsp_message_in(struct scsi_cmnd *SCpnt)
  12 {
  13         unsigned int  base = SCpnt->device->host->io_port;
  14         nsp_hw_data  *data = (nsp_hw_data *)SCpnt->device->host->hostdata;
  15         unsigned char data_reg, control_reg;
  16         int           ret, len;
  17
  18         /*
  19          * XXX: NSP QUIRK
  20          * NSP invoke interrupts only in the case of scsi phase changes,
  21          * therefore we should poll the scsi phase here to catch
  22          * the next "msg in" if exists (no scsi phase changes).
  23          */
  24         ret = 16;
  25         len = 0;
  26
  27         nsp_dbg(NSP_DEBUG_MSGINOCCUR, "msgin loop");
  28         do {
  29                 /* read data */
  30                 data_reg = nsp_index_read(base, SCSIDATAIN);
  31
  32                 /* assert ACK */
  33                 control_reg = nsp_index_read(base, SCSIBUSCTRL);
  34                 control_reg |= SCSI_ACK;
  35                 nsp_index_write(base, SCSIBUSCTRL, control_reg);
  36                 nsp_negate_signal(SCpnt, BUSMON_REQ, "msgin<REQ>");
  37
  38                 data->MsgBuffer[len] = data_reg; len++;
  39
  40                 /* deassert ACK */
  41                 control_reg =  nsp_index_read(base, SCSIBUSCTRL);
  42                 control_reg &= ~SCSI_ACK;
  43                 nsp_index_write(base, SCSIBUSCTRL, control_reg);
  44
  45                 /* catch a next signal */
  46                 ret = nsp_expect_signal(SCpnt, BUSPHASE_MESSAGE_IN, BUSMON_REQ);
  47         } while (ret > 0 && MSGBUF_SIZE > len);
  48
  49         data->MsgLen = len;
  50
  51 }
  52
  53 static void nsp_message_out(struct scsi_cmnd *SCpnt)
  54 {
  55         nsp_hw_data *data = (nsp_hw_data *)SCpnt->device->host->hostdata;
  56         int ret = 1;
  57         int len = data->MsgLen;
  58
  59         /*
  60          * XXX: NSP QUIRK
  61          * NSP invoke interrupts only in the case of scsi phase changes,
  62          * therefore we should poll the scsi phase here to catch
  63          * the next "msg out" if exists (no scsi phase changes).
  64          */
  65
  66         nsp_dbg(NSP_DEBUG_MSGOUTOCCUR, "msgout loop");
  67         do {
  68                 if (nsp_xfer(SCpnt, BUSPHASE_MESSAGE_OUT)) {
  69                         nsp_msg(KERN_DEBUG, "msgout: xfer short");
  70                 }
  71
  72                 /* catch a next signal */
  73                 ret = nsp_expect_signal(SCpnt, BUSPHASE_MESSAGE_OUT, BUSMON_REQ);
  74         } while (ret > 0 && len-- > 0);
  75
  76 }
  77
  78 /* end */