From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- drivers/scsi/pcmcia/nsp_message.c | 78 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 drivers/scsi/pcmcia/nsp_message.c (limited to 'drivers/scsi/pcmcia/nsp_message.c') diff --git a/drivers/scsi/pcmcia/nsp_message.c b/drivers/scsi/pcmcia/nsp_message.c new file mode 100644 index 000000000..ef593b70d --- /dev/null +++ b/drivers/scsi/pcmcia/nsp_message.c @@ -0,0 +1,78 @@ +/*========================================================================== + 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 */ -- cgit v1.2.3