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/*==========================================================================

  NinjaSCSI-3 message handler

      By: YOKOTA Hiroshi <yokota@netlab.is.tsukuba.ac.jp>

   This software may be used and distributed according to the terms of

   the GNU General Public License.

 */

/* $Id: nsp_message.c,v 1.1.1.1 2004-04-15 02:15:11 phoenix Exp $ */

static void nsp_message_in(Scsi_Cmnd *SCpnt)

{

        unsigned int  base = SCpnt->device->host->io_port;

        nsp_hw_data  *data = (nsp_hw_data *)SCpnt->device->host->hostdata;

        unsigned char data_reg, control_reg;

        int           ret, len;

        /*

         * XXX: NSP QUIRK

         * NSP invoke interrupts only in the case of scsi phase changes,

         * therefore we should poll the scsi phase here to catch

         * the next "msg in" if exists (no scsi phase changes).

         */

        ret = 16;

        len = 0;

        nsp_dbg(NSP_DEBUG_MSGINOCCUR, "msgin loop");

        do {

                /* read data */

                data_reg = nsp_index_read(base, SCSIDATAIN);

                /* assert ACK */

                control_reg = nsp_index_read(base, SCSIBUSCTRL);

                control_reg |= SCSI_ACK;

                nsp_index_write(base, SCSIBUSCTRL, control_reg);

                nsp_negate_signal(SCpnt, BUSMON_REQ, "msgin<REQ>");

                data->MsgBuffer[len] = data_reg; len++;

                /* deassert ACK */

                control_reg =  nsp_index_read(base, SCSIBUSCTRL);

                control_reg &= ~SCSI_ACK;

                nsp_index_write(base, SCSIBUSCTRL, control_reg);

                /* catch a next signal */

                ret = nsp_expect_signal(SCpnt, BUSPHASE_MESSAGE_IN, BUSMON_REQ);

        } while (ret > 0 && MSGBUF_SIZE > len);

        data->MsgLen = len;

}

static void nsp_message_out(Scsi_Cmnd *SCpnt)

{

        nsp_hw_data *data = (nsp_hw_data *)SCpnt->device->host->hostdata;

        int ret = 1;

        int len = data->MsgLen;

        /*

         * XXX: NSP QUIRK

         * NSP invoke interrupts only in the case of scsi phase changes,

         * therefore we should poll the scsi phase here to catch

         * the next "msg out" if exists (no scsi phase changes).

         */

        nsp_dbg(NSP_DEBUG_MSGOUTOCCUR, "msgout loop");

        do {

                if (nsp_xfer(SCpnt, BUSPHASE_MESSAGE_OUT)) {

                        nsp_msg(KERN_DEBUG, "msgout: xfer short");

                }

                /* catch a next signal */

                ret = nsp_expect_signal(SCpnt, BUSPHASE_MESSAGE_OUT, BUSMON_REQ);

        } while (ret > 0 && len-- > 0);

}

/* end */