LXR linux/drivers/scsi/pcmcia/nsp

   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
  11static 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
  53static 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 */
  79