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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 1.7 2001/09/07 04:33:01 elca Exp $ */
static void nsp_message_in(Scsi_Cmnd *SCpnt, nsp_hw_data *data)
{
unsigned int base = SCpnt->host->io_port;
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;
DEBUG(0, " msgin loop\n");
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)
{
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).
*/
DEBUG(0, " msgout loop\n");
do {
if (nsp_xfer(SCpnt, data, BUSPHASE_MESSAGE_OUT)) {
printk(KERN_DEBUG " " __FUNCTION__ " msgout: xfer short\n");
}
/* catch a next signal */
ret = nsp_expect_signal(SCpnt, BUSPHASE_MESSAGE_OUT, BUSMON_REQ);
} while (ret > 0 && len-- > 0);
}
/* end */
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