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1/*==========================================================================2 NinjaSCSI-3 message handler3 By: YOKOTA Hiroshi <yokota@netlab.is.tsukuba.ac.jp>4 5 This software may be used and distributed according to the terms of6 the GNU General Public License.7 */8 9/* $Id: nsp_message.c,v 1.6 2003/07/26 14:21:09 elca Exp $ */10 11static void nsp_message_in(struct scsi_cmnd *SCpnt)12{13 unsigned int base = SCpnt->device->host->io_port;14 nsp_hw_data *data = (nsp_hw_data *)SCpnt->device->host->hostdata;15 unsigned char data_reg, control_reg;16 int ret, len;17 18 /*19 * XXX: NSP QUIRK20 * NSP invoke interrupts only in the case of scsi phase changes,21 * therefore we should poll the scsi phase here to catch 22 * the next "msg in" if exists (no scsi phase changes).23 */24 ret = 16;25 len = 0;26 27 nsp_dbg(NSP_DEBUG_MSGINOCCUR, "msgin loop");28 do {29 /* read data */30 data_reg = nsp_index_read(base, SCSIDATAIN);31 32 /* assert ACK */33 control_reg = nsp_index_read(base, SCSIBUSCTRL);34 control_reg |= SCSI_ACK;35 nsp_index_write(base, SCSIBUSCTRL, control_reg);36 nsp_negate_signal(SCpnt, BUSMON_REQ, "msgin<REQ>");37 38 data->MsgBuffer[len] = data_reg; len++;39 40 /* deassert ACK */41 control_reg = nsp_index_read(base, SCSIBUSCTRL);42 control_reg &= ~SCSI_ACK;43 nsp_index_write(base, SCSIBUSCTRL, control_reg);44 45 /* catch a next signal */46 ret = nsp_expect_signal(SCpnt, BUSPHASE_MESSAGE_IN, BUSMON_REQ);47 } while (ret > 0 && MSGBUF_SIZE > len);48 49 data->MsgLen = len;50 51}52 53static void nsp_message_out(struct scsi_cmnd *SCpnt)54{55 nsp_hw_data *data = (nsp_hw_data *)SCpnt->device->host->hostdata;56 int ret = 1;57 int len = data->MsgLen;58 59 /*60 * XXX: NSP QUIRK61 * NSP invoke interrupts only in the case of scsi phase changes,62 * therefore we should poll the scsi phase here to catch 63 * the next "msg out" if exists (no scsi phase changes).64 */65 66 nsp_dbg(NSP_DEBUG_MSGOUTOCCUR, "msgout loop");67 do {68 if (nsp_xfer(SCpnt, BUSPHASE_MESSAGE_OUT)) {69 nsp_msg(KERN_DEBUG, "msgout: xfer short");70 }71 72 /* catch a next signal */73 ret = nsp_expect_signal(SCpnt, BUSPHASE_MESSAGE_OUT, BUSMON_REQ);74 } while (ret > 0 && len-- > 0);75 76}77 78/* end */79