/*========================================================================== NinjaSCSI-3 message handler By: YOKOTA Hiroshi This software may be used and distributed according to the terms of the GNU General Public License. */ /* $Id: nsp_message.c,v 1.6 2003/07/26 14:21:09 elca Exp $ */ static void nsp_message_in(struct 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"); 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(struct 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 */