79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
/*==========================================================================
|
|
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 1.6 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<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(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 */
|