79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
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/*==========================================================================
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NinjaSCSI-3 message handler
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By: YOKOTA Hiroshi <yokota@netlab.is.tsukuba.ac.jp>
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This software may be used and distributed according to the terms of
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the GNU General Public License.
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*/
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/* $Id: nsp_message.c,v 1.6 2003/07/26 14:21:09 elca Exp $ */
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static void nsp_message_in(struct scsi_cmnd *SCpnt)
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{
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unsigned int base = SCpnt->device->host->io_port;
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nsp_hw_data *data = (nsp_hw_data *)SCpnt->device->host->hostdata;
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unsigned char data_reg, control_reg;
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int ret, len;
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/*
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* XXX: NSP QUIRK
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* NSP invoke interrupts only in the case of scsi phase changes,
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* therefore we should poll the scsi phase here to catch
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* the next "msg in" if exists (no scsi phase changes).
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*/
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ret = 16;
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len = 0;
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nsp_dbg(NSP_DEBUG_MSGINOCCUR, "msgin loop");
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do {
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/* read data */
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data_reg = nsp_index_read(base, SCSIDATAIN);
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/* assert ACK */
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control_reg = nsp_index_read(base, SCSIBUSCTRL);
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control_reg |= SCSI_ACK;
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nsp_index_write(base, SCSIBUSCTRL, control_reg);
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nsp_negate_signal(SCpnt, BUSMON_REQ, "msgin<REQ>");
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data->MsgBuffer[len] = data_reg; len++;
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/* deassert ACK */
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control_reg = nsp_index_read(base, SCSIBUSCTRL);
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control_reg &= ~SCSI_ACK;
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nsp_index_write(base, SCSIBUSCTRL, control_reg);
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/* catch a next signal */
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ret = nsp_expect_signal(SCpnt, BUSPHASE_MESSAGE_IN, BUSMON_REQ);
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} while (ret > 0 && MSGBUF_SIZE > len);
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data->MsgLen = len;
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}
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static void nsp_message_out(struct scsi_cmnd *SCpnt)
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{
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nsp_hw_data *data = (nsp_hw_data *)SCpnt->device->host->hostdata;
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int ret = 1;
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int len = data->MsgLen;
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/*
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* XXX: NSP QUIRK
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* NSP invoke interrupts only in the case of scsi phase changes,
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* therefore we should poll the scsi phase here to catch
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* the next "msg out" if exists (no scsi phase changes).
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*/
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nsp_dbg(NSP_DEBUG_MSGOUTOCCUR, "msgout loop");
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do {
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if (nsp_xfer(SCpnt, BUSPHASE_MESSAGE_OUT)) {
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nsp_msg(KERN_DEBUG, "msgout: xfer short");
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}
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/* catch a next signal */
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ret = nsp_expect_signal(SCpnt, BUSPHASE_MESSAGE_OUT, BUSMON_REQ);
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} while (ret > 0 && len-- > 0);
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}
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/* end */
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