forked from luck/tmp_suning_uos_patched
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2059 lines
64 KiB
Plaintext
2059 lines
64 KiB
Plaintext
/*
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* Adaptec U320 device driver firmware for Linux and FreeBSD.
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*
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* Copyright (c) 1994-2001 Justin T. Gibbs.
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* Copyright (c) 2000-2002 Adaptec Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*
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* $FreeBSD$
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*/
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VERSION = "$Id: //depot/aic7xxx/aic7xxx/aic79xx.seq#99 $"
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PATCH_ARG_LIST = "struct ahd_softc *ahd"
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PREFIX = "ahd_"
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#include "aic79xx.reg"
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#include "scsi_message.h"
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restart:
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if ((ahd->bugs & AHD_INTCOLLISION_BUG) != 0) {
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test SEQINTCODE, 0xFF jz idle_loop;
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SET_SEQINTCODE(NO_SEQINT)
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}
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idle_loop:
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if ((ahd->bugs & AHD_INTCOLLISION_BUG) != 0) {
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/*
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* Convert ERROR status into a sequencer
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* interrupt to handle the case of an
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* interrupt collision on the hardware
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* setting of HWERR.
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*/
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test ERROR, 0xFF jz no_error_set;
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SET_SEQINTCODE(SAW_HWERR)
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no_error_set:
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}
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SET_MODE(M_SCSI, M_SCSI)
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test SCSISEQ0, ENSELO|ENARBO jnz idle_loop_checkbus;
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test SEQ_FLAGS2, SELECTOUT_QFROZEN jnz idle_loop_checkbus;
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cmp WAITING_TID_HEAD[1], SCB_LIST_NULL je idle_loop_checkbus;
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/*
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* ENSELO is cleared by a SELDO, so we must test for SELDO
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* one last time.
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*/
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BEGIN_CRITICAL;
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test SSTAT0, SELDO jnz select_out;
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END_CRITICAL;
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call start_selection;
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idle_loop_checkbus:
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BEGIN_CRITICAL;
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test SSTAT0, SELDO jnz select_out;
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END_CRITICAL;
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test SSTAT0, SELDI jnz select_in;
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test SCSIPHASE, ~DATA_PHASE_MASK jz idle_loop_check_nonpackreq;
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test SCSISIGO, ATNO jz idle_loop_check_nonpackreq;
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call unexpected_nonpkt_phase_find_ctxt;
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idle_loop_check_nonpackreq:
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test SSTAT2, NONPACKREQ jz . + 2;
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call unexpected_nonpkt_phase_find_ctxt;
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if ((ahd->bugs & AHD_FAINT_LED_BUG) != 0) {
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and A, FIFO0FREE|FIFO1FREE, DFFSTAT;
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cmp A, FIFO0FREE|FIFO1FREE jne . + 3;
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and SBLKCTL, ~DIAGLEDEN|DIAGLEDON;
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jmp . + 2;
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or SBLKCTL, DIAGLEDEN|DIAGLEDON;
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}
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call idle_loop_gsfifo_in_scsi_mode;
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call idle_loop_service_fifos;
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call idle_loop_cchan;
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jmp idle_loop;
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BEGIN_CRITICAL;
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idle_loop_gsfifo:
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SET_MODE(M_SCSI, M_SCSI)
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idle_loop_gsfifo_in_scsi_mode:
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test LQISTAT2, LQIGSAVAIL jz return;
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/*
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* We have received good status for this transaction. There may
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* still be data in our FIFOs draining to the host. Complete
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* the SCB only if all data has transferred to the host.
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*/
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good_status_IU_done:
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bmov SCBPTR, GSFIFO, 2;
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clr SCB_SCSI_STATUS;
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/*
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* If a command completed before an attempted task management
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* function completed, notify the host after disabling any
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* pending select-outs.
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*/
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test SCB_TASK_MANAGEMENT, 0xFF jz gsfifo_complete_normally;
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test SSTAT0, SELDO|SELINGO jnz . + 2;
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and SCSISEQ0, ~ENSELO;
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SET_SEQINTCODE(TASKMGMT_CMD_CMPLT_OKAY)
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gsfifo_complete_normally:
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or SCB_CONTROL, STATUS_RCVD;
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/*
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* Since this status did not consume a FIFO, we have to
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* be a bit more dilligent in how we check for FIFOs pertaining
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* to this transaction. There are two states that a FIFO still
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* transferring data may be in.
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*
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* 1) Configured and draining to the host, with a FIFO handler.
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* 2) Pending cfg4data, fifo not empty.
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*
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* Case 1 can be detected by noticing a non-zero FIFO active
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* count in the SCB. In this case, we allow the routine servicing
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* the FIFO to complete the SCB.
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*
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* Case 2 implies either a pending or yet to occur save data
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* pointers for this same context in the other FIFO. So, if
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* we detect case 1, we will properly defer the post of the SCB
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* and achieve the desired result. The pending cfg4data will
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* notice that status has been received and complete the SCB.
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*/
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test SCB_FIFO_USE_COUNT, 0xFF jnz idle_loop_gsfifo_in_scsi_mode;
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call complete;
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END_CRITICAL;
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jmp idle_loop_gsfifo_in_scsi_mode;
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idle_loop_service_fifos:
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SET_MODE(M_DFF0, M_DFF0)
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test LONGJMP_ADDR[1], INVALID_ADDR jnz idle_loop_next_fifo;
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call longjmp;
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idle_loop_next_fifo:
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SET_MODE(M_DFF1, M_DFF1)
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test LONGJMP_ADDR[1], INVALID_ADDR jz longjmp;
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return:
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ret;
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idle_loop_cchan:
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SET_MODE(M_CCHAN, M_CCHAN)
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test QOFF_CTLSTA, HS_MAILBOX_ACT jz hs_mailbox_empty;
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or QOFF_CTLSTA, HS_MAILBOX_ACT;
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mov LOCAL_HS_MAILBOX, HS_MAILBOX;
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hs_mailbox_empty:
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BEGIN_CRITICAL;
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test CCSCBCTL, CCARREN|CCSCBEN jz scbdma_idle;
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test CCSCBCTL, CCSCBDIR jnz fetch_new_scb_inprog;
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test CCSCBCTL, CCSCBDONE jz return;
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END_CRITICAL;
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/* FALLTHROUGH */
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scbdma_tohost_done:
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test CCSCBCTL, CCARREN jz fill_qoutfifo_dmadone;
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/*
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* An SCB has been succesfully uploaded to the host.
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* If the SCB was uploaded for some reason other than
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* bad SCSI status (currently only for underruns), we
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* queue the SCB for normal completion. Otherwise, we
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* wait until any select-out activity has halted, and
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* then notify the host so that the transaction can be
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* dealt with.
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*/
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test SCB_SCSI_STATUS, 0xff jnz scbdma_notify_host;
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and CCSCBCTL, ~(CCARREN|CCSCBEN);
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bmov COMPLETE_DMA_SCB_HEAD, SCB_NEXT_COMPLETE, 2;
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bmov SCB_NEXT_COMPLETE, COMPLETE_SCB_HEAD, 2;
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bmov COMPLETE_SCB_HEAD, SCBPTR, 2 ret;
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scbdma_notify_host:
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SET_MODE(M_SCSI, M_SCSI)
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test SCSISEQ0, ENSELO jnz return;
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test SSTAT0, (SELDO|SELINGO) jnz return;
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SET_MODE(M_CCHAN, M_CCHAN)
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/*
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* Remove SCB and notify host.
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*/
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and CCSCBCTL, ~(CCARREN|CCSCBEN);
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bmov COMPLETE_DMA_SCB_HEAD, SCB_NEXT_COMPLETE, 2;
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SET_SEQINTCODE(BAD_SCB_STATUS)
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ret;
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fill_qoutfifo_dmadone:
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and CCSCBCTL, ~(CCARREN|CCSCBEN);
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call qoutfifo_updated;
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mvi COMPLETE_SCB_DMAINPROG_HEAD[1], SCB_LIST_NULL;
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bmov QOUTFIFO_NEXT_ADDR, SCBHADDR, 4;
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test QOFF_CTLSTA, SDSCB_ROLLOVR jz return;
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bmov QOUTFIFO_NEXT_ADDR, SHARED_DATA_ADDR, 4;
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xor QOUTFIFO_ENTRY_VALID_TAG, QOUTFIFO_ENTRY_VALID_TOGGLE ret;
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qoutfifo_updated:
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/*
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* If there are more commands waiting to be dma'ed
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* to the host, always coalesce. Otherwise honor the
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* host's wishes.
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*/
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cmp COMPLETE_DMA_SCB_HEAD[1], SCB_LIST_NULL jne coalesce_by_count;
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cmp COMPLETE_SCB_HEAD[1], SCB_LIST_NULL jne coalesce_by_count;
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test LOCAL_HS_MAILBOX, ENINT_COALESCE jz issue_cmdcmplt;
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/*
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* If we have relatively few commands outstanding, don't
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* bother waiting for another command to complete.
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*/
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test CMDS_PENDING[1], 0xFF jnz coalesce_by_count;
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/* Add -1 so that jnc means <= not just < */
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add A, -1, INT_COALESCING_MINCMDS;
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add NONE, A, CMDS_PENDING;
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jnc issue_cmdcmplt;
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/*
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* If coalescing, only coalesce up to the limit
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* provided by the host driver.
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*/
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coalesce_by_count:
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mov A, INT_COALESCING_MAXCMDS;
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add NONE, A, INT_COALESCING_CMDCOUNT;
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jc issue_cmdcmplt;
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/*
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* If the timer is not currently active,
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* fire it up.
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*/
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test INTCTL, SWTMINTMASK jz return;
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bmov SWTIMER, INT_COALESCING_TIMER, 2;
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mvi CLRSEQINTSTAT, CLRSEQ_SWTMRTO;
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or INTCTL, SWTMINTEN|SWTIMER_START;
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and INTCTL, ~SWTMINTMASK ret;
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issue_cmdcmplt:
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mvi INTSTAT, CMDCMPLT;
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clr INT_COALESCING_CMDCOUNT;
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or INTCTL, SWTMINTMASK ret;
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BEGIN_CRITICAL;
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fetch_new_scb_inprog:
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test CCSCBCTL, ARRDONE jz return;
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fetch_new_scb_done:
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and CCSCBCTL, ~(CCARREN|CCSCBEN);
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bmov REG0, SCBPTR, 2;
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clr A;
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add CMDS_PENDING, 1;
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adc CMDS_PENDING[1], A;
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if ((ahd->bugs & AHD_PKT_LUN_BUG) != 0) {
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/*
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* "Short Luns" are not placed into outgoing LQ
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* packets in the correct byte order. Use a full
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* sized lun field instead and fill it with the
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* one byte of lun information we support.
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*/
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mov SCB_PKT_LUN[6], SCB_LUN;
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}
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/*
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* The FIFO use count field is shared with the
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* tag set by the host so that our SCB dma engine
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* knows the correct location to store the SCB.
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* Set it to zero before processing the SCB.
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*/
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clr SCB_FIFO_USE_COUNT;
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/* Update the next SCB address to download. */
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bmov NEXT_QUEUED_SCB_ADDR, SCB_NEXT_SCB_BUSADDR, 4;
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mvi SCB_NEXT[1], SCB_LIST_NULL;
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mvi SCB_NEXT2[1], SCB_LIST_NULL;
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/* Increment our position in the QINFIFO. */
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mov NONE, SNSCB_QOFF;
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/*
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* SCBs that want to send messages are always
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* queued independently. This ensures that they
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* are at the head of the SCB list to select out
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* to a target and we will see the MK_MESSAGE flag.
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*/
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test SCB_CONTROL, MK_MESSAGE jnz first_new_target_scb;
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shr SINDEX, 3, SCB_SCSIID;
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and SINDEX, ~0x1;
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mvi SINDEX[1], (WAITING_SCB_TAILS >> 8);
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bmov DINDEX, SINDEX, 2;
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bmov SCBPTR, SINDIR, 2;
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bmov DINDIR, REG0, 2;
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cmp SCBPTR[1], SCB_LIST_NULL je first_new_target_scb;
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bmov SCB_NEXT, REG0, 2 ret;
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first_new_target_scb:
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cmp WAITING_TID_HEAD[1], SCB_LIST_NULL je first_new_scb;
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bmov SCBPTR, WAITING_TID_TAIL, 2;
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bmov SCB_NEXT2, REG0, 2;
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bmov WAITING_TID_TAIL, REG0, 2 ret;
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first_new_scb:
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bmov WAITING_TID_HEAD, REG0, 2;
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bmov WAITING_TID_TAIL, REG0, 2 ret;
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END_CRITICAL;
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scbdma_idle:
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/*
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* Give precedence to downloading new SCBs to execute
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* unless select-outs are currently frozen.
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*/
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test SEQ_FLAGS2, SELECTOUT_QFROZEN jnz . + 2;
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BEGIN_CRITICAL;
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test QOFF_CTLSTA, NEW_SCB_AVAIL jnz fetch_new_scb;
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cmp COMPLETE_DMA_SCB_HEAD[1], SCB_LIST_NULL jne dma_complete_scb;
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cmp COMPLETE_SCB_HEAD[1], SCB_LIST_NULL je return;
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/* FALLTHROUGH */
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fill_qoutfifo:
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/*
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* Keep track of the SCBs we are dmaing just
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* in case the DMA fails or is aborted.
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*/
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mov A, QOUTFIFO_ENTRY_VALID_TAG;
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bmov COMPLETE_SCB_DMAINPROG_HEAD, COMPLETE_SCB_HEAD, 2;
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mvi CCSCBCTL, CCSCBRESET;
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bmov SCBHADDR, QOUTFIFO_NEXT_ADDR, 4;
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bmov SCBPTR, COMPLETE_SCB_HEAD, 2;
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fill_qoutfifo_loop:
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mov CCSCBRAM, SCBPTR;
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or CCSCBRAM, A, SCBPTR[1];
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mov NONE, SDSCB_QOFF;
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inc INT_COALESCING_CMDCOUNT;
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add CMDS_PENDING, -1;
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adc CMDS_PENDING[1], -1;
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cmp SCB_NEXT_COMPLETE[1], SCB_LIST_NULL je fill_qoutfifo_done;
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cmp CCSCBADDR, CCSCBADDR_MAX je fill_qoutfifo_done;
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test QOFF_CTLSTA, SDSCB_ROLLOVR jnz fill_qoutfifo_done;
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bmov SCBPTR, SCB_NEXT_COMPLETE, 2;
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jmp fill_qoutfifo_loop;
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fill_qoutfifo_done:
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mov SCBHCNT, CCSCBADDR;
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mvi CCSCBCTL, CCSCBEN|CCSCBRESET;
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bmov COMPLETE_SCB_HEAD, SCB_NEXT_COMPLETE, 2;
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mvi SCB_NEXT_COMPLETE[1], SCB_LIST_NULL ret;
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fetch_new_scb:
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bmov SCBHADDR, NEXT_QUEUED_SCB_ADDR, 4;
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mvi CCARREN|CCSCBEN|CCSCBDIR|CCSCBRESET jmp dma_scb;
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dma_complete_scb:
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bmov SCBPTR, COMPLETE_DMA_SCB_HEAD, 2;
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bmov SCBHADDR, SCB_BUSADDR, 4;
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mvi CCARREN|CCSCBEN|CCSCBRESET jmp dma_scb;
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END_CRITICAL;
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/*
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* Either post or fetch an SCB from host memory. The caller
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* is responsible for polling for transfer completion.
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*
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* Prerequisits: Mode == M_CCHAN
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* SINDEX contains CCSCBCTL flags
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* SCBHADDR set to Host SCB address
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* SCBPTR set to SCB src location on "push" operations
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*/
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SET_SRC_MODE M_CCHAN;
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SET_DST_MODE M_CCHAN;
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dma_scb:
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mvi SCBHCNT, SCB_TRANSFER_SIZE;
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mov CCSCBCTL, SINDEX ret;
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BEGIN_CRITICAL;
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setjmp:
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bmov LONGJMP_ADDR, STACK, 2 ret;
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setjmp_inline:
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bmov LONGJMP_ADDR, STACK, 2;
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longjmp:
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bmov STACK, LONGJMP_ADDR, 2 ret;
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END_CRITICAL;
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/*************************** Chip Bug Work Arounds ****************************/
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/*
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* Must disable interrupts when setting the mode pointer
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* register as an interrupt occurring mid update will
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* fail to store the new mode value for restoration on
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* an iret.
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*/
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if ((ahd->bugs & AHD_SET_MODE_BUG) != 0) {
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set_mode_work_around:
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mvi SEQINTCTL, INTVEC1DSL;
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mov MODE_PTR, SINDEX;
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clr SEQINTCTL ret;
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toggle_dff_mode_work_around:
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mvi SEQINTCTL, INTVEC1DSL;
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xor MODE_PTR, MK_MODE(M_DFF1, M_DFF1);
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clr SEQINTCTL ret;
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}
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if ((ahd->bugs & AHD_INTCOLLISION_BUG) != 0) {
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set_seqint_work_around:
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mov SEQINTCODE, SINDEX;
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mvi SEQINTCODE, NO_SEQINT ret;
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}
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/************************ Packetized LongJmp Routines *************************/
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SET_SRC_MODE M_SCSI;
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SET_DST_MODE M_SCSI;
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start_selection:
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BEGIN_CRITICAL;
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if ((ahd->bugs & AHD_SENT_SCB_UPDATE_BUG) != 0) {
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/*
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* Razor #494
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* Rev A hardware fails to update LAST/CURR/NEXTSCB
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* correctly after a packetized selection in several
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* situations:
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*
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* 1) If only one command existed in the queue, the
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* LAST/CURR/NEXTSCB are unchanged.
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*
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* 2) In a non QAS, protocol allowed phase change,
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* the queue is shifted 1 too far. LASTSCB is
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* the last SCB that was correctly processed.
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*
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* 3) In the QAS case, if the full list of commands
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* was successfully sent, NEXTSCB is NULL and neither
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* CURRSCB nor LASTSCB can be trusted. We must
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|
* manually walk the list counting MAXCMDCNT elements
|
|
* to find the last SCB that was sent correctly.
|
|
*
|
|
* To simplify the workaround for this bug in SELDO
|
|
* handling, we initialize LASTSCB prior to enabling
|
|
* selection so we can rely on it even for case #1 above.
|
|
*/
|
|
bmov LASTSCB, WAITING_TID_HEAD, 2;
|
|
}
|
|
bmov CURRSCB, WAITING_TID_HEAD, 2;
|
|
bmov SCBPTR, WAITING_TID_HEAD, 2;
|
|
shr SELOID, 4, SCB_SCSIID;
|
|
/*
|
|
* If we want to send a message to the device, ensure
|
|
* we are selecting with atn irregardless of our packetized
|
|
* agreement. Since SPI4 only allows target reset or PPR
|
|
* messages if this is a packetized connection, the change
|
|
* to our negotiation table entry for this selection will
|
|
* be cleared when the message is acted on.
|
|
*/
|
|
test SCB_CONTROL, MK_MESSAGE jz . + 3;
|
|
mov NEGOADDR, SELOID;
|
|
or NEGCONOPTS, ENAUTOATNO;
|
|
or SCSISEQ0, ENSELO ret;
|
|
END_CRITICAL;
|
|
|
|
/*
|
|
* Allocate a FIFO for a non-packetized transaction.
|
|
* In RevA hardware, both FIFOs must be free before we
|
|
* can allocate a FIFO for a non-packetized transaction.
|
|
*/
|
|
allocate_fifo_loop:
|
|
/*
|
|
* Do whatever work is required to free a FIFO.
|
|
*/
|
|
call idle_loop_service_fifos;
|
|
SET_MODE(M_SCSI, M_SCSI)
|
|
allocate_fifo:
|
|
if ((ahd->bugs & AHD_NONPACKFIFO_BUG) != 0) {
|
|
and A, FIFO0FREE|FIFO1FREE, DFFSTAT;
|
|
cmp A, FIFO0FREE|FIFO1FREE jne allocate_fifo_loop;
|
|
} else {
|
|
test DFFSTAT, FIFO1FREE jnz allocate_fifo1;
|
|
test DFFSTAT, FIFO0FREE jz allocate_fifo_loop;
|
|
mvi DFFSTAT, B_CURRFIFO_0;
|
|
SET_MODE(M_DFF0, M_DFF0)
|
|
bmov SCBPTR, ALLOCFIFO_SCBPTR, 2 ret;
|
|
}
|
|
SET_SRC_MODE M_SCSI;
|
|
SET_DST_MODE M_SCSI;
|
|
allocate_fifo1:
|
|
mvi DFFSTAT, CURRFIFO_1;
|
|
SET_MODE(M_DFF1, M_DFF1)
|
|
bmov SCBPTR, ALLOCFIFO_SCBPTR, 2 ret;
|
|
|
|
/*
|
|
* We have been reselected as an initiator
|
|
* or selected as a target.
|
|
*/
|
|
SET_SRC_MODE M_SCSI;
|
|
SET_DST_MODE M_SCSI;
|
|
select_in:
|
|
if ((ahd->bugs & AHD_BUSFREEREV_BUG) != 0) {
|
|
/*
|
|
* Test to ensure that the bus has not
|
|
* already gone free prior to clearing
|
|
* any stale busfree status. This avoids
|
|
* a window whereby a busfree just after
|
|
* a selection could be missed.
|
|
*/
|
|
test SCSISIGI, BSYI jz . + 2;
|
|
mvi CLRSINT1,CLRBUSFREE;
|
|
or SIMODE1, ENBUSFREE;
|
|
}
|
|
or SXFRCTL0, SPIOEN;
|
|
and SAVED_SCSIID, SELID_MASK, SELID;
|
|
and A, OID, IOWNID;
|
|
or SAVED_SCSIID, A;
|
|
mvi CLRSINT0, CLRSELDI;
|
|
jmp ITloop;
|
|
|
|
/*
|
|
* We have successfully selected out.
|
|
*
|
|
* Clear SELDO.
|
|
* Dequeue all SCBs sent from the waiting queue
|
|
* Requeue all SCBs *not* sent to the tail of the waiting queue
|
|
* Take Razor #494 into account for above.
|
|
*
|
|
* In Packetized Mode:
|
|
* Return to the idle loop. Our interrupt handler will take
|
|
* care of any incoming L_Qs.
|
|
*
|
|
* In Non-Packetize Mode:
|
|
* Continue to our normal state machine.
|
|
*/
|
|
SET_SRC_MODE M_SCSI;
|
|
SET_DST_MODE M_SCSI;
|
|
select_out:
|
|
BEGIN_CRITICAL;
|
|
/* Clear out all SCBs that have been successfully sent. */
|
|
if ((ahd->bugs & AHD_SENT_SCB_UPDATE_BUG) != 0) {
|
|
/*
|
|
* For packetized, the LQO manager clears ENSELO on
|
|
* the assertion of SELDO. If we are non-packetized,
|
|
* LASTSCB and CURRSCB are accurate.
|
|
*/
|
|
test SCSISEQ0, ENSELO jnz use_lastscb;
|
|
|
|
/*
|
|
* The update is correct for LQOSTAT1 errors. All
|
|
* but LQOBUSFREE are handled by kernel interrupts.
|
|
* If we see LQOBUSFREE, return to the idle loop.
|
|
* Once we are out of the select_out critical section,
|
|
* the kernel will cleanup the LQOBUSFREE and we will
|
|
* eventually restart the selection if appropriate.
|
|
*/
|
|
test LQOSTAT1, LQOBUSFREE jnz idle_loop;
|
|
|
|
/*
|
|
* On a phase change oustside of packet boundaries,
|
|
* LASTSCB points to the currently active SCB context
|
|
* on the bus.
|
|
*/
|
|
test LQOSTAT2, LQOPHACHGOUTPKT jnz use_lastscb;
|
|
|
|
/*
|
|
* If the hardware has traversed the whole list, NEXTSCB
|
|
* will be NULL, CURRSCB and LASTSCB cannot be trusted,
|
|
* but MAXCMDCNT is accurate. If we stop part way through
|
|
* the list or only had one command to issue, NEXTSCB[1] is
|
|
* not NULL and LASTSCB is the last command to go out.
|
|
*/
|
|
cmp NEXTSCB[1], SCB_LIST_NULL jne use_lastscb;
|
|
|
|
/*
|
|
* Brute force walk.
|
|
*/
|
|
bmov SCBPTR, WAITING_TID_HEAD, 2;
|
|
mvi SEQINTCTL, INTVEC1DSL;
|
|
mvi MODE_PTR, MK_MODE(M_CFG, M_CFG);
|
|
mov A, MAXCMDCNT;
|
|
mvi MODE_PTR, MK_MODE(M_SCSI, M_SCSI);
|
|
clr SEQINTCTL;
|
|
find_lastscb_loop:
|
|
dec A;
|
|
test A, 0xFF jz found_last_sent_scb;
|
|
bmov SCBPTR, SCB_NEXT, 2;
|
|
jmp find_lastscb_loop;
|
|
use_lastscb:
|
|
bmov SCBPTR, LASTSCB, 2;
|
|
found_last_sent_scb:
|
|
bmov CURRSCB, SCBPTR, 2;
|
|
curscb_ww_done:
|
|
} else {
|
|
bmov SCBPTR, CURRSCB, 2;
|
|
}
|
|
|
|
/*
|
|
* Requeue any SCBs not sent, to the tail of the waiting Q.
|
|
*/
|
|
cmp SCB_NEXT[1], SCB_LIST_NULL je select_out_list_done;
|
|
|
|
/*
|
|
* We know that neither the per-TID list nor the list of
|
|
* TIDs is empty. Use this knowledge to our advantage.
|
|
*/
|
|
bmov REG0, SCB_NEXT, 2;
|
|
bmov SCBPTR, WAITING_TID_TAIL, 2;
|
|
bmov SCB_NEXT2, REG0, 2;
|
|
bmov WAITING_TID_TAIL, REG0, 2;
|
|
jmp select_out_inc_tid_q;
|
|
|
|
select_out_list_done:
|
|
/*
|
|
* The whole list made it. Just clear our TID's tail pointer
|
|
* unless we were queued independently due to our need to
|
|
* send a message.
|
|
*/
|
|
test SCB_CONTROL, MK_MESSAGE jnz select_out_inc_tid_q;
|
|
shr DINDEX, 3, SCB_SCSIID;
|
|
or DINDEX, 1; /* Want only the second byte */
|
|
mvi DINDEX[1], ((WAITING_SCB_TAILS) >> 8);
|
|
mvi DINDIR, SCB_LIST_NULL;
|
|
select_out_inc_tid_q:
|
|
bmov SCBPTR, WAITING_TID_HEAD, 2;
|
|
bmov WAITING_TID_HEAD, SCB_NEXT2, 2;
|
|
cmp WAITING_TID_HEAD[1], SCB_LIST_NULL jne . + 2;
|
|
mvi WAITING_TID_TAIL[1], SCB_LIST_NULL;
|
|
bmov SCBPTR, CURRSCB, 2;
|
|
mvi CLRSINT0, CLRSELDO;
|
|
test LQOSTAT2, LQOPHACHGOUTPKT jnz unexpected_nonpkt_phase;
|
|
test LQOSTAT1, LQOPHACHGINPKT jnz unexpected_nonpkt_phase;
|
|
|
|
/*
|
|
* If this is a packetized connection, return to our
|
|
* idle_loop and let our interrupt handler deal with
|
|
* any connection setup/teardown issues. The only
|
|
* exceptions are the case of MK_MESSAGE and task management
|
|
* SCBs.
|
|
*/
|
|
if ((ahd->bugs & AHD_LQO_ATNO_BUG) != 0) {
|
|
/*
|
|
* In the A, the LQO manager transitions to LQOSTOP0 even if
|
|
* we have selected out with ATN asserted and the target
|
|
* REQs in a non-packet phase.
|
|
*/
|
|
test SCB_CONTROL, MK_MESSAGE jz select_out_no_message;
|
|
test SCSISIGO, ATNO jnz select_out_non_packetized;
|
|
select_out_no_message:
|
|
}
|
|
test LQOSTAT2, LQOSTOP0 jz select_out_non_packetized;
|
|
test SCB_TASK_MANAGEMENT, 0xFF jz idle_loop;
|
|
SET_SEQINTCODE(TASKMGMT_FUNC_COMPLETE)
|
|
jmp idle_loop;
|
|
|
|
select_out_non_packetized:
|
|
/* Non packetized request. */
|
|
and SCSISEQ0, ~ENSELO;
|
|
if ((ahd->bugs & AHD_BUSFREEREV_BUG) != 0) {
|
|
/*
|
|
* Test to ensure that the bus has not
|
|
* already gone free prior to clearing
|
|
* any stale busfree status. This avoids
|
|
* a window whereby a busfree just after
|
|
* a selection could be missed.
|
|
*/
|
|
test SCSISIGI, BSYI jz . + 2;
|
|
mvi CLRSINT1,CLRBUSFREE;
|
|
or SIMODE1, ENBUSFREE;
|
|
}
|
|
mov SAVED_SCSIID, SCB_SCSIID;
|
|
mov SAVED_LUN, SCB_LUN;
|
|
mvi SEQ_FLAGS, NO_CDB_SENT;
|
|
END_CRITICAL;
|
|
or SXFRCTL0, SPIOEN;
|
|
|
|
/*
|
|
* As soon as we get a successful selection, the target
|
|
* should go into the message out phase since we have ATN
|
|
* asserted.
|
|
*/
|
|
mvi MSG_OUT, MSG_IDENTIFYFLAG;
|
|
|
|
/*
|
|
* Main loop for information transfer phases. Wait for the
|
|
* target to assert REQ before checking MSG, C/D and I/O for
|
|
* the bus phase.
|
|
*/
|
|
mesgin_phasemis:
|
|
ITloop:
|
|
call phase_lock;
|
|
|
|
mov A, LASTPHASE;
|
|
|
|
test A, ~P_DATAIN_DT jz p_data;
|
|
cmp A,P_COMMAND je p_command;
|
|
cmp A,P_MESGOUT je p_mesgout;
|
|
cmp A,P_STATUS je p_status;
|
|
cmp A,P_MESGIN je p_mesgin;
|
|
|
|
SET_SEQINTCODE(BAD_PHASE)
|
|
jmp ITloop; /* Try reading the bus again. */
|
|
|
|
/*
|
|
* Command phase. Set up the DMA registers and let 'er rip.
|
|
*/
|
|
p_command:
|
|
test SEQ_FLAGS, NOT_IDENTIFIED jz p_command_okay;
|
|
SET_SEQINTCODE(PROTO_VIOLATION)
|
|
p_command_okay:
|
|
test MODE_PTR, ~(MK_MODE(M_DFF1, M_DFF1))
|
|
jnz p_command_allocate_fifo;
|
|
/*
|
|
* Command retry. Free our current FIFO and
|
|
* re-allocate a FIFO so transfer state is
|
|
* reset.
|
|
*/
|
|
SET_SRC_MODE M_DFF1;
|
|
SET_DST_MODE M_DFF1;
|
|
mvi DFFSXFRCTL, RSTCHN|CLRSHCNT;
|
|
SET_MODE(M_SCSI, M_SCSI)
|
|
p_command_allocate_fifo:
|
|
bmov ALLOCFIFO_SCBPTR, SCBPTR, 2;
|
|
call allocate_fifo;
|
|
SET_SRC_MODE M_DFF1;
|
|
SET_DST_MODE M_DFF1;
|
|
add NONE, -17, SCB_CDB_LEN;
|
|
jnc p_command_embedded;
|
|
p_command_from_host:
|
|
bmov HADDR[0], SCB_HOST_CDB_PTR, 9;
|
|
mvi SG_CACHE_PRE, LAST_SEG;
|
|
mvi DFCNTRL, (PRELOADEN|SCSIEN|HDMAEN);
|
|
jmp p_command_xfer;
|
|
p_command_embedded:
|
|
bmov SHCNT[0], SCB_CDB_LEN, 1;
|
|
bmov DFDAT, SCB_CDB_STORE, 16;
|
|
mvi DFCNTRL, SCSIEN;
|
|
p_command_xfer:
|
|
and SEQ_FLAGS, ~NO_CDB_SENT;
|
|
if ((ahd->features & AHD_FAST_CDB_DELIVERY) != 0) {
|
|
/*
|
|
* To speed up CDB delivery in Rev B, all CDB acks
|
|
* are "released" to the output sync as soon as the
|
|
* command phase starts. There is only one problem
|
|
* with this approach. If the target changes phase
|
|
* before all data are sent, we have left over acks
|
|
* that can go out on the bus in a data phase. Due
|
|
* to other chip contraints, this only happens if
|
|
* the target goes to data-in, but if the acks go
|
|
* out before we can test SDONE, we'll think that
|
|
* the transfer has completed successfully. Work
|
|
* around this by taking advantage of the 400ns or
|
|
* 800ns dead time between command phase and the REQ
|
|
* of the new phase. If the transfer has completed
|
|
* successfully, SCSIEN should fall *long* before we
|
|
* see a phase change. We thus treat any phasemiss
|
|
* that occurs before SCSIEN falls as an incomplete
|
|
* transfer.
|
|
*/
|
|
test SSTAT1, PHASEMIS jnz p_command_xfer_failed;
|
|
test DFCNTRL, SCSIEN jnz . - 1;
|
|
} else {
|
|
test DFCNTRL, SCSIEN jnz .;
|
|
}
|
|
/*
|
|
* DMA Channel automatically disabled.
|
|
* Don't allow a data phase if the command
|
|
* was not fully transferred.
|
|
*/
|
|
test SSTAT2, SDONE jnz ITloop;
|
|
p_command_xfer_failed:
|
|
or SEQ_FLAGS, NO_CDB_SENT;
|
|
jmp ITloop;
|
|
|
|
|
|
/*
|
|
* Status phase. Wait for the data byte to appear, then read it
|
|
* and store it into the SCB.
|
|
*/
|
|
SET_SRC_MODE M_SCSI;
|
|
SET_DST_MODE M_SCSI;
|
|
p_status:
|
|
test SEQ_FLAGS,NOT_IDENTIFIED jnz mesgin_proto_violation;
|
|
p_status_okay:
|
|
mov SCB_SCSI_STATUS, SCSIDAT;
|
|
or SCB_CONTROL, STATUS_RCVD;
|
|
jmp ITloop;
|
|
|
|
/*
|
|
* Message out phase. If MSG_OUT is MSG_IDENTIFYFLAG, build a full
|
|
* indentify message sequence and send it to the target. The host may
|
|
* override this behavior by setting the MK_MESSAGE bit in the SCB
|
|
* control byte. This will cause us to interrupt the host and allow
|
|
* it to handle the message phase completely on its own. If the bit
|
|
* associated with this target is set, we will also interrupt the host,
|
|
* thereby allowing it to send a message on the next selection regardless
|
|
* of the transaction being sent.
|
|
*
|
|
* If MSG_OUT is == HOST_MSG, also interrupt the host and take a message.
|
|
* This is done to allow the host to send messages outside of an identify
|
|
* sequence while protecting the seqencer from testing the MK_MESSAGE bit
|
|
* on an SCB that might not be for the current nexus. (For example, a
|
|
* BDR message in responce to a bad reselection would leave us pointed to
|
|
* an SCB that doesn't have anything to do with the current target).
|
|
*
|
|
* Otherwise, treat MSG_OUT as a 1 byte message to send (abort, abort tag,
|
|
* bus device reset).
|
|
*
|
|
* When there are no messages to send, MSG_OUT should be set to MSG_NOOP,
|
|
* in case the target decides to put us in this phase for some strange
|
|
* reason.
|
|
*/
|
|
p_mesgout_retry:
|
|
/* Turn on ATN for the retry */
|
|
mvi SCSISIGO, ATNO;
|
|
p_mesgout:
|
|
mov SINDEX, MSG_OUT;
|
|
cmp SINDEX, MSG_IDENTIFYFLAG jne p_mesgout_from_host;
|
|
test SCB_CONTROL,MK_MESSAGE jnz host_message_loop;
|
|
p_mesgout_identify:
|
|
or SINDEX, MSG_IDENTIFYFLAG|DISCENB, SCB_LUN;
|
|
test SCB_CONTROL, DISCENB jnz . + 2;
|
|
and SINDEX, ~DISCENB;
|
|
/*
|
|
* Send a tag message if TAG_ENB is set in the SCB control block.
|
|
* Use SCB_NONPACKET_TAG as the tag value.
|
|
*/
|
|
p_mesgout_tag:
|
|
test SCB_CONTROL,TAG_ENB jz p_mesgout_onebyte;
|
|
mov SCSIDAT, SINDEX; /* Send the identify message */
|
|
call phase_lock;
|
|
cmp LASTPHASE, P_MESGOUT jne p_mesgout_done;
|
|
and SCSIDAT,TAG_ENB|SCB_TAG_TYPE,SCB_CONTROL;
|
|
call phase_lock;
|
|
cmp LASTPHASE, P_MESGOUT jne p_mesgout_done;
|
|
mov SCBPTR jmp p_mesgout_onebyte;
|
|
/*
|
|
* Interrupt the driver, and allow it to handle this message
|
|
* phase and any required retries.
|
|
*/
|
|
p_mesgout_from_host:
|
|
cmp SINDEX, HOST_MSG jne p_mesgout_onebyte;
|
|
jmp host_message_loop;
|
|
|
|
p_mesgout_onebyte:
|
|
mvi CLRSINT1, CLRATNO;
|
|
mov SCSIDAT, SINDEX;
|
|
|
|
/*
|
|
* If the next bus phase after ATN drops is message out, it means
|
|
* that the target is requesting that the last message(s) be resent.
|
|
*/
|
|
call phase_lock;
|
|
cmp LASTPHASE, P_MESGOUT je p_mesgout_retry;
|
|
|
|
p_mesgout_done:
|
|
mvi CLRSINT1,CLRATNO; /* Be sure to turn ATNO off */
|
|
mov LAST_MSG, MSG_OUT;
|
|
mvi MSG_OUT, MSG_NOOP; /* No message left */
|
|
jmp ITloop;
|
|
|
|
/*
|
|
* Message in phase. Bytes are read using Automatic PIO mode.
|
|
*/
|
|
p_mesgin:
|
|
/* read the 1st message byte */
|
|
mvi ACCUM call inb_first;
|
|
|
|
test A,MSG_IDENTIFYFLAG jnz mesgin_identify;
|
|
cmp A,MSG_DISCONNECT je mesgin_disconnect;
|
|
cmp A,MSG_SAVEDATAPOINTER je mesgin_sdptrs;
|
|
cmp ALLZEROS,A je mesgin_complete;
|
|
cmp A,MSG_RESTOREPOINTERS je mesgin_rdptrs;
|
|
cmp A,MSG_IGN_WIDE_RESIDUE je mesgin_ign_wide_residue;
|
|
cmp A,MSG_NOOP je mesgin_done;
|
|
|
|
/*
|
|
* Pushed message loop to allow the kernel to
|
|
* run it's own message state engine. To avoid an
|
|
* extra nop instruction after signaling the kernel,
|
|
* we perform the phase_lock before checking to see
|
|
* if we should exit the loop and skip the phase_lock
|
|
* in the ITloop. Performing back to back phase_locks
|
|
* shouldn't hurt, but why do it twice...
|
|
*/
|
|
host_message_loop:
|
|
call phase_lock; /* Benign the first time through. */
|
|
SET_SEQINTCODE(HOST_MSG_LOOP)
|
|
cmp RETURN_1, EXIT_MSG_LOOP je ITloop;
|
|
cmp RETURN_1, CONT_MSG_LOOP_WRITE jne . + 3;
|
|
mov SCSIDAT, RETURN_2;
|
|
jmp host_message_loop;
|
|
/* Must be CONT_MSG_LOOP_READ */
|
|
mov NONE, SCSIDAT; /* ACK Byte */
|
|
jmp host_message_loop;
|
|
|
|
mesgin_ign_wide_residue:
|
|
mov SAVED_MODE, MODE_PTR;
|
|
SET_MODE(M_SCSI, M_SCSI)
|
|
shr NEGOADDR, 4, SAVED_SCSIID;
|
|
mov A, NEGCONOPTS;
|
|
RESTORE_MODE(SAVED_MODE)
|
|
test A, WIDEXFER jz mesgin_reject;
|
|
/* Pull the residue byte */
|
|
mvi REG0 call inb_next;
|
|
cmp REG0, 0x01 jne mesgin_reject;
|
|
test SCB_RESIDUAL_SGPTR[0], SG_LIST_NULL jz . + 2;
|
|
test SCB_TASK_ATTRIBUTE, SCB_XFERLEN_ODD jnz mesgin_done;
|
|
SET_SEQINTCODE(IGN_WIDE_RES)
|
|
jmp mesgin_done;
|
|
|
|
mesgin_proto_violation:
|
|
SET_SEQINTCODE(PROTO_VIOLATION)
|
|
jmp mesgin_done;
|
|
mesgin_reject:
|
|
mvi MSG_MESSAGE_REJECT call mk_mesg;
|
|
mesgin_done:
|
|
mov NONE,SCSIDAT; /*dummy read from latch to ACK*/
|
|
jmp ITloop;
|
|
|
|
#define INDEX_DISC_LIST(scsiid, lun) \
|
|
and A, 0xC0, scsiid; \
|
|
or SCBPTR, A, lun; \
|
|
clr SCBPTR[1]; \
|
|
and SINDEX, 0x30, scsiid; \
|
|
shr SINDEX, 3; /* Multiply by 2 */ \
|
|
add SINDEX, (SCB_DISCONNECTED_LISTS & 0xFF); \
|
|
mvi SINDEX[1], ((SCB_DISCONNECTED_LISTS >> 8) & 0xFF)
|
|
|
|
mesgin_identify:
|
|
/*
|
|
* Determine whether a target is using tagged or non-tagged
|
|
* transactions by first looking at the transaction stored in
|
|
* the per-device, disconnected array. If there is no untagged
|
|
* transaction for this target, this must be a tagged transaction.
|
|
*/
|
|
and SAVED_LUN, MSG_IDENTIFY_LUNMASK, A;
|
|
INDEX_DISC_LIST(SAVED_SCSIID, SAVED_LUN);
|
|
bmov DINDEX, SINDEX, 2;
|
|
bmov REG0, SINDIR, 2;
|
|
cmp REG0[1], SCB_LIST_NULL je snoop_tag;
|
|
/* Untagged. Clear the busy table entry and setup the SCB. */
|
|
bmov DINDIR, ALLONES, 2;
|
|
bmov SCBPTR, REG0, 2;
|
|
jmp setup_SCB;
|
|
|
|
/*
|
|
* Here we "snoop" the bus looking for a SIMPLE QUEUE TAG message.
|
|
* If we get one, we use the tag returned to find the proper
|
|
* SCB. After receiving the tag, look for the SCB at SCB locations tag and
|
|
* tag + 256.
|
|
*/
|
|
snoop_tag:
|
|
if ((ahd->flags & AHD_SEQUENCER_DEBUG) != 0) {
|
|
or SEQ_FLAGS, 0x80;
|
|
}
|
|
mov NONE, SCSIDAT; /* ACK Identify MSG */
|
|
call phase_lock;
|
|
if ((ahd->flags & AHD_SEQUENCER_DEBUG) != 0) {
|
|
or SEQ_FLAGS, 0x1;
|
|
}
|
|
cmp LASTPHASE, P_MESGIN jne not_found_ITloop;
|
|
if ((ahd->flags & AHD_SEQUENCER_DEBUG) != 0) {
|
|
or SEQ_FLAGS, 0x2;
|
|
}
|
|
cmp SCSIBUS, MSG_SIMPLE_Q_TAG jne not_found;
|
|
get_tag:
|
|
clr SCBPTR[1];
|
|
mvi SCBPTR call inb_next; /* tag value */
|
|
verify_scb:
|
|
test SCB_CONTROL,DISCONNECTED jz verify_other_scb;
|
|
mov A, SAVED_SCSIID;
|
|
cmp SCB_SCSIID, A jne verify_other_scb;
|
|
mov A, SAVED_LUN;
|
|
cmp SCB_LUN, A je setup_SCB_disconnected;
|
|
verify_other_scb:
|
|
xor SCBPTR[1], 1;
|
|
test SCBPTR[1], 0xFF jnz verify_scb;
|
|
jmp not_found;
|
|
|
|
/*
|
|
* Ensure that the SCB the tag points to is for
|
|
* an SCB transaction to the reconnecting target.
|
|
*/
|
|
setup_SCB:
|
|
if ((ahd->flags & AHD_SEQUENCER_DEBUG) != 0) {
|
|
or SEQ_FLAGS, 0x10;
|
|
}
|
|
test SCB_CONTROL,DISCONNECTED jz not_found;
|
|
setup_SCB_disconnected:
|
|
and SCB_CONTROL,~DISCONNECTED;
|
|
clr SEQ_FLAGS; /* make note of IDENTIFY */
|
|
test SCB_SGPTR, SG_LIST_NULL jnz . + 3;
|
|
bmov ALLOCFIFO_SCBPTR, SCBPTR, 2;
|
|
call allocate_fifo;
|
|
/* See if the host wants to send a message upon reconnection */
|
|
test SCB_CONTROL, MK_MESSAGE jz mesgin_done;
|
|
mvi HOST_MSG call mk_mesg;
|
|
jmp mesgin_done;
|
|
|
|
not_found:
|
|
SET_SEQINTCODE(NO_MATCH)
|
|
jmp mesgin_done;
|
|
|
|
not_found_ITloop:
|
|
SET_SEQINTCODE(NO_MATCH)
|
|
jmp ITloop;
|
|
|
|
/*
|
|
* We received a "command complete" message. Put the SCB on the complete
|
|
* queue and trigger a completion interrupt via the idle loop. Before doing
|
|
* so, check to see if there
|
|
* is a residual or the status byte is something other than STATUS_GOOD (0).
|
|
* In either of these conditions, we upload the SCB back to the host so it can
|
|
* process this information. In the case of a non zero status byte, we
|
|
* additionally interrupt the kernel driver synchronously, allowing it to
|
|
* decide if sense should be retrieved. If the kernel driver wishes to request
|
|
* sense, it will fill the kernel SCB with a request sense command, requeue
|
|
* it to the QINFIFO and tell us not to post to the QOUTFIFO by setting
|
|
* RETURN_1 to SEND_SENSE.
|
|
*/
|
|
mesgin_complete:
|
|
|
|
/*
|
|
* If ATN is raised, we still want to give the target a message.
|
|
* Perhaps there was a parity error on this last message byte.
|
|
* Either way, the target should take us to message out phase
|
|
* and then attempt to complete the command again. We should use a
|
|
* critical section here to guard against a timeout triggering
|
|
* for this command and setting ATN while we are still processing
|
|
* the completion.
|
|
test SCSISIGI, ATNI jnz mesgin_done;
|
|
*/
|
|
|
|
/*
|
|
* If we are identified and have successfully sent the CDB,
|
|
* any status will do. Optimize this fast path.
|
|
*/
|
|
test SCB_CONTROL, STATUS_RCVD jz mesgin_proto_violation;
|
|
test SEQ_FLAGS, NOT_IDENTIFIED|NO_CDB_SENT jz complete_accepted;
|
|
|
|
/*
|
|
* If the target never sent an identify message but instead went
|
|
* to mesgin to give an invalid message, let the host abort us.
|
|
*/
|
|
test SEQ_FLAGS, NOT_IDENTIFIED jnz mesgin_proto_violation;
|
|
|
|
/*
|
|
* If we recevied good status but never successfully sent the
|
|
* cdb, abort the command.
|
|
*/
|
|
test SCB_SCSI_STATUS,0xff jnz complete_accepted;
|
|
test SEQ_FLAGS, NO_CDB_SENT jnz mesgin_proto_violation;
|
|
complete_accepted:
|
|
|
|
/*
|
|
* See if we attempted to deliver a message but the target ingnored us.
|
|
*/
|
|
test SCB_CONTROL, MK_MESSAGE jz complete_nomsg;
|
|
SET_SEQINTCODE(MKMSG_FAILED)
|
|
complete_nomsg:
|
|
call queue_scb_completion;
|
|
jmp await_busfree;
|
|
|
|
freeze_queue:
|
|
/* Cancel any pending select-out. */
|
|
test SSTAT0, SELDO|SELINGO jnz . + 2;
|
|
and SCSISEQ0, ~ENSELO;
|
|
mov ACCUM_SAVE, A;
|
|
clr A;
|
|
add QFREEZE_COUNT, 1;
|
|
adc QFREEZE_COUNT[1], A;
|
|
or SEQ_FLAGS2, SELECTOUT_QFROZEN;
|
|
mov A, ACCUM_SAVE ret;
|
|
|
|
/*
|
|
* Complete the current FIFO's SCB if data for this same
|
|
* SCB is not transferring in the other FIFO.
|
|
*/
|
|
SET_SRC_MODE M_DFF1;
|
|
SET_DST_MODE M_DFF1;
|
|
pkt_complete_scb_if_fifos_idle:
|
|
bmov ARG_1, SCBPTR, 2;
|
|
mvi DFFSXFRCTL, CLRCHN;
|
|
SET_MODE(M_SCSI, M_SCSI)
|
|
bmov SCBPTR, ARG_1, 2;
|
|
test SCB_FIFO_USE_COUNT, 0xFF jnz return;
|
|
queue_scb_completion:
|
|
test SCB_SCSI_STATUS,0xff jnz bad_status;
|
|
/*
|
|
* Check for residuals
|
|
*/
|
|
test SCB_SGPTR, SG_LIST_NULL jnz complete; /* No xfer */
|
|
test SCB_SGPTR, SG_FULL_RESID jnz upload_scb;/* Never xfered */
|
|
test SCB_RESIDUAL_SGPTR, SG_LIST_NULL jz upload_scb;
|
|
complete:
|
|
bmov SCB_NEXT_COMPLETE, COMPLETE_SCB_HEAD, 2;
|
|
bmov COMPLETE_SCB_HEAD, SCBPTR, 2 ret;
|
|
bad_status:
|
|
cmp SCB_SCSI_STATUS, STATUS_PKT_SENSE je upload_scb;
|
|
call freeze_queue;
|
|
upload_scb:
|
|
/*
|
|
* Restore SCB TAG since we reuse this field
|
|
* in the sequencer. We don't want to corrupt
|
|
* it on the host.
|
|
*/
|
|
bmov SCB_TAG, SCBPTR, 2;
|
|
bmov SCB_NEXT_COMPLETE, COMPLETE_DMA_SCB_HEAD, 2;
|
|
bmov COMPLETE_DMA_SCB_HEAD, SCBPTR, 2;
|
|
or SCB_SGPTR, SG_STATUS_VALID ret;
|
|
|
|
/*
|
|
* Is it a disconnect message? Set a flag in the SCB to remind us
|
|
* and await the bus going free. If this is an untagged transaction
|
|
* store the SCB id for it in our untagged target table for lookup on
|
|
* a reselction.
|
|
*/
|
|
mesgin_disconnect:
|
|
/*
|
|
* If ATN is raised, we still want to give the target a message.
|
|
* Perhaps there was a parity error on this last message byte
|
|
* or we want to abort this command. Either way, the target
|
|
* should take us to message out phase and then attempt to
|
|
* disconnect again.
|
|
* XXX - Wait for more testing.
|
|
test SCSISIGI, ATNI jnz mesgin_done;
|
|
*/
|
|
test SEQ_FLAGS, NOT_IDENTIFIED|NO_CDB_SENT
|
|
jnz mesgin_proto_violation;
|
|
or SCB_CONTROL,DISCONNECTED;
|
|
test SCB_CONTROL, TAG_ENB jnz await_busfree;
|
|
queue_disc_scb:
|
|
bmov REG0, SCBPTR, 2;
|
|
INDEX_DISC_LIST(SAVED_SCSIID, SAVED_LUN);
|
|
bmov DINDEX, SINDEX, 2;
|
|
bmov DINDIR, REG0, 2;
|
|
bmov SCBPTR, REG0, 2;
|
|
/* FALLTHROUGH */
|
|
await_busfree:
|
|
and SIMODE1, ~ENBUSFREE;
|
|
if ((ahd->bugs & AHD_BUSFREEREV_BUG) == 0) {
|
|
/*
|
|
* In the BUSFREEREV_BUG case, the
|
|
* busfree status was cleared at the
|
|
* beginning of the connection.
|
|
*/
|
|
mvi CLRSINT1,CLRBUSFREE;
|
|
}
|
|
mov NONE, SCSIDAT; /* Ack the last byte */
|
|
test MODE_PTR, ~(MK_MODE(M_DFF1, M_DFF1))
|
|
jnz await_busfree_not_m_dff;
|
|
SET_SRC_MODE M_DFF1;
|
|
SET_DST_MODE M_DFF1;
|
|
await_busfree_clrchn:
|
|
mvi DFFSXFRCTL, CLRCHN;
|
|
await_busfree_not_m_dff:
|
|
call clear_target_state;
|
|
test SSTAT1,REQINIT|BUSFREE jz .;
|
|
test SSTAT1, BUSFREE jnz idle_loop;
|
|
SET_SEQINTCODE(MISSED_BUSFREE)
|
|
|
|
|
|
/*
|
|
* Save data pointers message:
|
|
* Copying RAM values back to SCB, for Save Data Pointers message, but
|
|
* only if we've actually been into a data phase to change them. This
|
|
* protects against bogus data in scratch ram and the residual counts
|
|
* since they are only initialized when we go into data_in or data_out.
|
|
* Ack the message as soon as possible.
|
|
*/
|
|
SET_SRC_MODE M_DFF1;
|
|
SET_DST_MODE M_DFF1;
|
|
mesgin_sdptrs:
|
|
mov NONE,SCSIDAT; /*dummy read from latch to ACK*/
|
|
test SEQ_FLAGS, DPHASE jz ITloop;
|
|
call save_pointers;
|
|
jmp ITloop;
|
|
|
|
save_pointers:
|
|
/*
|
|
* If we are asked to save our position at the end of the
|
|
* transfer, just mark us at the end rather than perform a
|
|
* full save.
|
|
*/
|
|
test SCB_RESIDUAL_SGPTR[0], SG_LIST_NULL jz save_pointers_full;
|
|
or SCB_SGPTR, SG_LIST_NULL ret;
|
|
|
|
save_pointers_full:
|
|
/*
|
|
* The SCB_DATAPTR becomes the current SHADDR.
|
|
* All other information comes directly from our residual
|
|
* state.
|
|
*/
|
|
bmov SCB_DATAPTR, SHADDR, 8;
|
|
bmov SCB_DATACNT, SCB_RESIDUAL_DATACNT, 8 ret;
|
|
|
|
/*
|
|
* Restore pointers message? Data pointers are recopied from the
|
|
* SCB anytime we enter a data phase for the first time, so all
|
|
* we need to do is clear the DPHASE flag and let the data phase
|
|
* code do the rest. We also reset/reallocate the FIFO to make
|
|
* sure we have a clean start for the next data or command phase.
|
|
*/
|
|
mesgin_rdptrs:
|
|
and SEQ_FLAGS, ~DPHASE;
|
|
test MODE_PTR, ~(MK_MODE(M_DFF1, M_DFF1)) jnz msgin_rdptrs_get_fifo;
|
|
mvi DFFSXFRCTL, RSTCHN|CLRSHCNT;
|
|
SET_MODE(M_SCSI, M_SCSI)
|
|
msgin_rdptrs_get_fifo:
|
|
call allocate_fifo;
|
|
jmp mesgin_done;
|
|
|
|
clear_target_state:
|
|
mvi LASTPHASE, P_BUSFREE;
|
|
/* clear target specific flags */
|
|
mvi SEQ_FLAGS, NOT_IDENTIFIED|NO_CDB_SENT ret;
|
|
|
|
phase_lock:
|
|
if ((ahd->bugs & AHD_EARLY_REQ_BUG) != 0) {
|
|
/*
|
|
* Don't ignore persistent REQ assertions just because
|
|
* they were asserted within the bus settle delay window.
|
|
* This allows us to tolerate devices like the GEM318
|
|
* that violate the SCSI spec. We are careful not to
|
|
* count REQ while we are waiting for it to fall during
|
|
* an async phase due to our asserted ACK. Each
|
|
* sequencer instruction takes ~25ns, so the REQ must
|
|
* last at least 100ns in order to be counted as a true
|
|
* REQ.
|
|
*/
|
|
test SCSIPHASE, 0xFF jnz phase_locked;
|
|
test SCSISIGI, ACKI jnz phase_lock;
|
|
test SCSISIGI, REQI jz phase_lock;
|
|
test SCSIPHASE, 0xFF jnz phase_locked;
|
|
test SCSISIGI, ACKI jnz phase_lock;
|
|
test SCSISIGI, REQI jz phase_lock;
|
|
phase_locked:
|
|
} else {
|
|
test SCSIPHASE, 0xFF jz .;
|
|
}
|
|
test SSTAT1, SCSIPERR jnz phase_lock;
|
|
phase_lock_latch_phase:
|
|
and LASTPHASE, PHASE_MASK, SCSISIGI ret;
|
|
|
|
/*
|
|
* Functions to read data in Automatic PIO mode.
|
|
*
|
|
* An ACK is not sent on input from the target until SCSIDATL is read from.
|
|
* So we wait until SCSIDATL is latched (the usual way), then read the data
|
|
* byte directly off the bus using SCSIBUSL. When we have pulled the ATN
|
|
* line, or we just want to acknowledge the byte, then we do a dummy read
|
|
* from SCISDATL. The SCSI spec guarantees that the target will hold the
|
|
* data byte on the bus until we send our ACK.
|
|
*
|
|
* The assumption here is that these are called in a particular sequence,
|
|
* and that REQ is already set when inb_first is called. inb_{first,next}
|
|
* use the same calling convention as inb.
|
|
*/
|
|
inb_next:
|
|
mov NONE,SCSIDAT; /*dummy read from latch to ACK*/
|
|
inb_next_wait:
|
|
/*
|
|
* If there is a parity error, wait for the kernel to
|
|
* see the interrupt and prepare our message response
|
|
* before continuing.
|
|
*/
|
|
test SCSIPHASE, 0xFF jz .;
|
|
test SSTAT1, SCSIPERR jnz inb_next_wait;
|
|
inb_next_check_phase:
|
|
and LASTPHASE, PHASE_MASK, SCSISIGI;
|
|
cmp LASTPHASE, P_MESGIN jne mesgin_phasemis;
|
|
inb_first:
|
|
clr DINDEX[1];
|
|
mov DINDEX,SINDEX;
|
|
mov DINDIR,SCSIBUS ret; /*read byte directly from bus*/
|
|
inb_last:
|
|
mov NONE,SCSIDAT ret; /*dummy read from latch to ACK*/
|
|
|
|
mk_mesg:
|
|
mvi SCSISIGO, ATNO;
|
|
mov MSG_OUT,SINDEX ret;
|
|
|
|
SET_SRC_MODE M_DFF1;
|
|
SET_DST_MODE M_DFF1;
|
|
disable_ccsgen:
|
|
test SG_STATE, FETCH_INPROG jz disable_ccsgen_fetch_done;
|
|
clr CCSGCTL;
|
|
disable_ccsgen_fetch_done:
|
|
clr SG_STATE ret;
|
|
|
|
service_fifo:
|
|
/*
|
|
* Do we have any prefetch left???
|
|
*/
|
|
test SG_STATE, SEGS_AVAIL jnz idle_sg_avail;
|
|
|
|
/*
|
|
* Can this FIFO have access to the S/G cache yet?
|
|
*/
|
|
test CCSGCTL, SG_CACHE_AVAIL jz return;
|
|
|
|
/* Did we just finish fetching segs? */
|
|
test CCSGCTL, CCSGDONE jnz idle_sgfetch_complete;
|
|
|
|
/* Are we actively fetching segments? */
|
|
test CCSGCTL, CCSGENACK jnz return;
|
|
|
|
/*
|
|
* We fetch a "cacheline aligned" and sized amount of data
|
|
* so we don't end up referencing a non-existant page.
|
|
* Cacheline aligned is in quotes because the kernel will
|
|
* set the prefetch amount to a reasonable level if the
|
|
* cacheline size is unknown.
|
|
*/
|
|
bmov SGHADDR, SCB_RESIDUAL_SGPTR, 4;
|
|
mvi SGHCNT, SG_PREFETCH_CNT;
|
|
if ((ahd->bugs & AHD_REG_SLOW_SETTLE_BUG) != 0) {
|
|
/*
|
|
* Need two instruction between "touches" of SGHADDR.
|
|
*/
|
|
nop;
|
|
}
|
|
and SGHADDR[0], SG_PREFETCH_ALIGN_MASK, SCB_RESIDUAL_SGPTR;
|
|
mvi CCSGCTL, CCSGEN|CCSGRESET;
|
|
or SG_STATE, FETCH_INPROG ret;
|
|
idle_sgfetch_complete:
|
|
/*
|
|
* Guard against SG_CACHE_AVAIL activating during sg fetch
|
|
* request in the other FIFO.
|
|
*/
|
|
test SG_STATE, FETCH_INPROG jz return;
|
|
clr CCSGCTL;
|
|
and CCSGADDR, SG_PREFETCH_ADDR_MASK, SCB_RESIDUAL_SGPTR;
|
|
mvi SG_STATE, SEGS_AVAIL|LOADING_NEEDED;
|
|
idle_sg_avail:
|
|
/* Does the hardware have space for another SG entry? */
|
|
test DFSTATUS, PRELOAD_AVAIL jz return;
|
|
/*
|
|
* On the A, preloading a segment before HDMAENACK
|
|
* comes true can clobber the shaddow address of the
|
|
* first segment in the S/G FIFO. Wait until it is
|
|
* safe to proceed.
|
|
*/
|
|
if ((ahd->features & AHD_NEW_DFCNTRL_OPTS) == 0) {
|
|
test DFCNTRL, HDMAENACK jz return;
|
|
}
|
|
if ((ahd->flags & AHD_64BIT_ADDRESSING) != 0) {
|
|
bmov HADDR, CCSGRAM, 8;
|
|
} else {
|
|
bmov HADDR, CCSGRAM, 4;
|
|
}
|
|
bmov HCNT, CCSGRAM, 3;
|
|
bmov SCB_RESIDUAL_DATACNT[3], CCSGRAM, 1;
|
|
if ((ahd->flags & AHD_39BIT_ADDRESSING) != 0) {
|
|
and HADDR[4], SG_HIGH_ADDR_BITS, SCB_RESIDUAL_DATACNT[3];
|
|
}
|
|
if ((ahd->flags & AHD_64BIT_ADDRESSING) != 0) {
|
|
/* Skip 4 bytes of pad. */
|
|
add CCSGADDR, 4;
|
|
}
|
|
sg_advance:
|
|
clr A; /* add sizeof(struct scatter) */
|
|
add SCB_RESIDUAL_SGPTR[0],SG_SIZEOF;
|
|
adc SCB_RESIDUAL_SGPTR[1],A;
|
|
adc SCB_RESIDUAL_SGPTR[2],A;
|
|
adc SCB_RESIDUAL_SGPTR[3],A;
|
|
mov SINDEX, SCB_RESIDUAL_SGPTR[0];
|
|
test SCB_RESIDUAL_DATACNT[3], SG_LAST_SEG jz . + 3;
|
|
or SINDEX, LAST_SEG;
|
|
clr SG_STATE;
|
|
mov SG_CACHE_PRE, SINDEX;
|
|
if ((ahd->features & AHD_NEW_DFCNTRL_OPTS) != 0) {
|
|
/*
|
|
* Use SCSIENWRDIS so that SCSIEN is never
|
|
* modified by this operation.
|
|
*/
|
|
or DFCNTRL, PRELOADEN|HDMAEN|SCSIENWRDIS;
|
|
} else {
|
|
or DFCNTRL, PRELOADEN|HDMAEN;
|
|
}
|
|
/*
|
|
* Do we have another segment in the cache?
|
|
*/
|
|
add NONE, SG_PREFETCH_CNT_LIMIT, CCSGADDR;
|
|
jnc return;
|
|
and SG_STATE, ~SEGS_AVAIL ret;
|
|
|
|
/*
|
|
* Initialize the DMA address and counter from the SCB.
|
|
*/
|
|
load_first_seg:
|
|
bmov HADDR, SCB_DATAPTR, 11;
|
|
and REG_ISR, ~SG_FULL_RESID, SCB_SGPTR[0];
|
|
test SCB_DATACNT[3], SG_LAST_SEG jz . + 2;
|
|
or REG_ISR, LAST_SEG;
|
|
mov SG_CACHE_PRE, REG_ISR;
|
|
mvi DFCNTRL, (PRELOADEN|SCSIEN|HDMAEN);
|
|
/*
|
|
* Since we've are entering a data phase, we will
|
|
* rely on the SCB_RESID* fields. Initialize the
|
|
* residual and clear the full residual flag.
|
|
*/
|
|
and SCB_SGPTR[0], ~SG_FULL_RESID;
|
|
bmov SCB_RESIDUAL_DATACNT[3], SCB_DATACNT[3], 5;
|
|
/* If we need more S/G elements, tell the idle loop */
|
|
test SCB_RESIDUAL_DATACNT[3], SG_LAST_SEG jnz . + 2;
|
|
mvi SG_STATE, LOADING_NEEDED ret;
|
|
clr SG_STATE ret;
|
|
|
|
p_data_handle_xfer:
|
|
call setjmp;
|
|
test SG_STATE, LOADING_NEEDED jnz service_fifo;
|
|
p_data_clear_handler:
|
|
or LONGJMP_ADDR[1], INVALID_ADDR ret;
|
|
|
|
p_data:
|
|
test SEQ_FLAGS, NOT_IDENTIFIED|NO_CDB_SENT jz p_data_allowed;
|
|
SET_SEQINTCODE(PROTO_VIOLATION)
|
|
p_data_allowed:
|
|
|
|
test SEQ_FLAGS, DPHASE jz data_phase_initialize;
|
|
|
|
/*
|
|
* If we re-enter the data phase after going through another
|
|
* phase, our transfer location has almost certainly been
|
|
* corrupted by the interveining, non-data, transfers. Ask
|
|
* the host driver to fix us up based on the transfer residual
|
|
* unless we already know that we should be bitbucketing.
|
|
*/
|
|
test SCB_RESIDUAL_SGPTR[0], SG_LIST_NULL jnz p_data_bitbucket;
|
|
SET_SEQINTCODE(PDATA_REINIT)
|
|
jmp data_phase_inbounds;
|
|
|
|
p_data_bitbucket:
|
|
/*
|
|
* Turn on `Bit Bucket' mode, wait until the target takes
|
|
* us to another phase, and then notify the host.
|
|
*/
|
|
mov SAVED_MODE, MODE_PTR;
|
|
test MODE_PTR, ~(MK_MODE(M_DFF1, M_DFF1))
|
|
jnz bitbucket_not_m_dff;
|
|
/*
|
|
* Ensure that any FIFO contents are cleared out and the
|
|
* FIFO free'd prior to starting the BITBUCKET. BITBUCKET
|
|
* doesn't discard data already in the FIFO.
|
|
*/
|
|
mvi DFFSXFRCTL, RSTCHN|CLRSHCNT;
|
|
SET_MODE(M_SCSI, M_SCSI)
|
|
bitbucket_not_m_dff:
|
|
or SXFRCTL1,BITBUCKET;
|
|
/* Wait for non-data phase. */
|
|
test SCSIPHASE, ~DATA_PHASE_MASK jz .;
|
|
and SXFRCTL1, ~BITBUCKET;
|
|
RESTORE_MODE(SAVED_MODE)
|
|
SET_SRC_MODE M_DFF1;
|
|
SET_DST_MODE M_DFF1;
|
|
SET_SEQINTCODE(DATA_OVERRUN)
|
|
jmp ITloop;
|
|
|
|
data_phase_initialize:
|
|
test SCB_SGPTR[0], SG_LIST_NULL jnz p_data_bitbucket;
|
|
call load_first_seg;
|
|
data_phase_inbounds:
|
|
/* We have seen a data phase at least once. */
|
|
or SEQ_FLAGS, DPHASE;
|
|
mov SAVED_MODE, MODE_PTR;
|
|
test SG_STATE, LOADING_NEEDED jz data_group_dma_loop;
|
|
call p_data_handle_xfer;
|
|
data_group_dma_loop:
|
|
/*
|
|
* The transfer is complete if either the last segment
|
|
* completes or the target changes phase. Both conditions
|
|
* will clear SCSIEN.
|
|
*/
|
|
call idle_loop_service_fifos;
|
|
call idle_loop_cchan;
|
|
call idle_loop_gsfifo;
|
|
RESTORE_MODE(SAVED_MODE)
|
|
test DFCNTRL, SCSIEN jnz data_group_dma_loop;
|
|
|
|
data_group_dmafinish:
|
|
/*
|
|
* The transfer has terminated either due to a phase
|
|
* change, and/or the completion of the last segment.
|
|
* We have two goals here. Do as much other work
|
|
* as possible while the data fifo drains on a read
|
|
* and respond as quickly as possible to the standard
|
|
* messages (save data pointers/disconnect and command
|
|
* complete) that usually follow a data phase.
|
|
*/
|
|
call calc_residual;
|
|
|
|
/*
|
|
* Go ahead and shut down the DMA engine now.
|
|
*/
|
|
test DFCNTRL, DIRECTION jnz data_phase_finish;
|
|
data_group_fifoflush:
|
|
if ((ahd->bugs & AHD_AUTOFLUSH_BUG) != 0) {
|
|
or DFCNTRL, FIFOFLUSH;
|
|
}
|
|
/*
|
|
* We have enabled the auto-ack feature. This means
|
|
* that the controller may have already transferred
|
|
* some overrun bytes into the data FIFO and acked them
|
|
* on the bus. The only way to detect this situation is
|
|
* to wait for LAST_SEG_DONE to come true on a completed
|
|
* transfer and then test to see if the data FIFO is
|
|
* non-empty. We know there is more data yet to transfer
|
|
* if SG_LIST_NULL is not yet set, thus there cannot be
|
|
* an overrun.
|
|
*/
|
|
test SCB_RESIDUAL_SGPTR[0], SG_LIST_NULL jz data_phase_finish;
|
|
test SG_CACHE_SHADOW, LAST_SEG_DONE jz .;
|
|
test DFSTATUS, FIFOEMP jnz data_phase_finish;
|
|
/* Overrun */
|
|
jmp p_data;
|
|
data_phase_finish:
|
|
/*
|
|
* If the target has left us in data phase, loop through
|
|
* the dma code again. We will only loop if there is a
|
|
* data overrun.
|
|
*/
|
|
if ((ahd->flags & AHD_TARGETROLE) != 0) {
|
|
test SSTAT0, TARGET jnz data_phase_done;
|
|
}
|
|
if ((ahd->flags & AHD_INITIATORROLE) != 0) {
|
|
test SSTAT1, REQINIT jz .;
|
|
test SCSIPHASE, DATA_PHASE_MASK jnz p_data;
|
|
}
|
|
|
|
data_phase_done:
|
|
/* Kill off any pending prefetch */
|
|
call disable_ccsgen;
|
|
or LONGJMP_ADDR[1], INVALID_ADDR;
|
|
|
|
if ((ahd->flags & AHD_TARGETROLE) != 0) {
|
|
test SEQ_FLAGS, DPHASE_PENDING jz ITloop;
|
|
/*
|
|
and SEQ_FLAGS, ~DPHASE_PENDING;
|
|
* For data-in phases, wait for any pending acks from the
|
|
* initiator before changing phase. We only need to
|
|
* send Ignore Wide Residue messages for data-in phases.
|
|
test DFCNTRL, DIRECTION jz target_ITloop;
|
|
test SSTAT1, REQINIT jnz .;
|
|
test SCB_TASK_ATTRIBUTE, SCB_XFERLEN_ODD jz target_ITloop;
|
|
SET_MODE(M_SCSI, M_SCSI)
|
|
test NEGCONOPTS, WIDEXFER jz target_ITloop;
|
|
*/
|
|
/*
|
|
* Issue an Ignore Wide Residue Message.
|
|
mvi P_MESGIN|BSYO call change_phase;
|
|
mvi MSG_IGN_WIDE_RESIDUE call target_outb;
|
|
mvi 1 call target_outb;
|
|
jmp target_ITloop;
|
|
*/
|
|
} else {
|
|
jmp ITloop;
|
|
}
|
|
|
|
/*
|
|
* We assume that, even though data may still be
|
|
* transferring to the host, that the SCSI side of
|
|
* the DMA engine is now in a static state. This
|
|
* allows us to update our notion of where we are
|
|
* in this transfer.
|
|
*
|
|
* If, by chance, we stopped before being able
|
|
* to fetch additional segments for this transfer,
|
|
* yet the last S/G was completely exhausted,
|
|
* call our idle loop until it is able to load
|
|
* another segment. This will allow us to immediately
|
|
* pickup on the next segment on the next data phase.
|
|
*
|
|
* If we happened to stop on the last segment, then
|
|
* our residual information is still correct from
|
|
* the idle loop and there is no need to perform
|
|
* any fixups.
|
|
*/
|
|
residual_before_last_seg:
|
|
test MDFFSTAT, SHVALID jnz sgptr_fixup;
|
|
/*
|
|
* Can never happen from an interrupt as the packetized
|
|
* hardware will only interrupt us once SHVALID or
|
|
* LAST_SEG_DONE.
|
|
*/
|
|
call idle_loop_service_fifos;
|
|
RESTORE_MODE(SAVED_MODE)
|
|
/* FALLTHROUGH */
|
|
calc_residual:
|
|
test SG_CACHE_SHADOW, LAST_SEG jz residual_before_last_seg;
|
|
/* Record if we've consumed all S/G entries */
|
|
test MDFFSTAT, SHVALID jz . + 2;
|
|
bmov SCB_RESIDUAL_DATACNT, SHCNT, 3 ret;
|
|
or SCB_RESIDUAL_SGPTR[0], SG_LIST_NULL ret;
|
|
|
|
sgptr_fixup:
|
|
/*
|
|
* Fixup the residual next S/G pointer. The S/G preload
|
|
* feature of the chip allows us to load two elements
|
|
* in addition to the currently active element. We
|
|
* store the bottom byte of the next S/G pointer in
|
|
* the SG_CACHE_PTR register so we can restore the
|
|
* correct value when the DMA completes. If the next
|
|
* sg ptr value has advanced to the point where higher
|
|
* bytes in the address have been affected, fix them
|
|
* too.
|
|
*/
|
|
test SG_CACHE_SHADOW, 0x80 jz sgptr_fixup_done;
|
|
test SCB_RESIDUAL_SGPTR[0], 0x80 jnz sgptr_fixup_done;
|
|
add SCB_RESIDUAL_SGPTR[1], -1;
|
|
adc SCB_RESIDUAL_SGPTR[2], -1;
|
|
adc SCB_RESIDUAL_SGPTR[3], -1;
|
|
sgptr_fixup_done:
|
|
and SCB_RESIDUAL_SGPTR[0], SG_ADDR_MASK, SG_CACHE_SHADOW;
|
|
clr SCB_RESIDUAL_DATACNT[3]; /* We are not the last seg */
|
|
bmov SCB_RESIDUAL_DATACNT, SHCNT, 3 ret;
|
|
|
|
export timer_isr:
|
|
call issue_cmdcmplt;
|
|
mvi CLRSEQINTSTAT, CLRSEQ_SWTMRTO;
|
|
if ((ahd->bugs & AHD_SET_MODE_BUG) != 0) {
|
|
/*
|
|
* In H2A4, the mode pointer is not saved
|
|
* for intvec2, but is restored on iret.
|
|
* This can lead to the restoration of a
|
|
* bogus mode ptr. Manually clear the
|
|
* intmask bits and do a normal return
|
|
* to compensate.
|
|
*/
|
|
and SEQINTCTL, ~(INTMASK2|INTMASK1) ret;
|
|
} else {
|
|
or SEQINTCTL, IRET ret;
|
|
}
|
|
|
|
export seq_isr:
|
|
if ((ahd->features & AHD_RTI) == 0) {
|
|
/*
|
|
* On RevA Silicon, if the target returns us to data-out
|
|
* after we have already trained for data-out, it is
|
|
* possible for us to transition the free running clock to
|
|
* data-valid before the required 100ns P1 setup time (8 P1
|
|
* assertions in fast-160 mode). This will only happen if
|
|
* this L-Q is a continuation of a data transfer for which
|
|
* we have already prefetched data into our FIFO (LQ/Data
|
|
* followed by LQ/Data for the same write transaction).
|
|
* This can cause some target implementations to miss the
|
|
* first few data transfers on the bus. We detect this
|
|
* situation by noticing that this is the first data transfer
|
|
* after an LQ (LQIWORKONLQ true), that the data transfer is
|
|
* a continuation of a transfer already setup in our FIFO
|
|
* (SAVEPTRS interrupt), and that the transaction is a write
|
|
* (DIRECTION set in DFCNTRL). The delay is performed by
|
|
* disabling SCSIEN until we see the first REQ from the
|
|
* target.
|
|
*
|
|
* First instruction in an ISR cannot be a branch on
|
|
* Rev A. Snapshot LQISTAT2 so the status is not missed
|
|
* and deffer the test by one instruction.
|
|
*/
|
|
mov REG_ISR, LQISTAT2;
|
|
test REG_ISR, LQIWORKONLQ jz main_isr;
|
|
test SEQINTSRC, SAVEPTRS jz main_isr;
|
|
test LONGJMP_ADDR[1], INVALID_ADDR jz saveptr_active_fifo;
|
|
/*
|
|
* Switch to the active FIFO after clearing the snapshot
|
|
* savepointer in the current FIFO. We do this so that
|
|
* a pending CTXTDONE or SAVEPTR is visible in the active
|
|
* FIFO. This status is the only way we can detect if we
|
|
* have lost the race (e.g. host paused us) and our attepts
|
|
* to disable the channel occurred after all REQs were
|
|
* already seen and acked (REQINIT never comes true).
|
|
*/
|
|
mvi DFFSXFRCTL, CLRCHN;
|
|
xor MODE_PTR, MK_MODE(M_DFF1, M_DFF1);
|
|
test DFCNTRL, DIRECTION jz interrupt_return;
|
|
and DFCNTRL, ~SCSIEN;
|
|
snapshot_wait_data_valid:
|
|
test SEQINTSRC, (CTXTDONE|SAVEPTRS) jnz snapshot_data_valid;
|
|
test SSTAT1, REQINIT jz snapshot_wait_data_valid;
|
|
snapshot_data_valid:
|
|
or DFCNTRL, SCSIEN;
|
|
or SEQINTCTL, IRET ret;
|
|
snapshot_saveptr:
|
|
mvi DFFSXFRCTL, CLRCHN;
|
|
or SEQINTCTL, IRET ret;
|
|
main_isr:
|
|
}
|
|
test SEQINTSRC, CFG4DATA jnz cfg4data_intr;
|
|
test SEQINTSRC, CFG4ISTAT jnz cfg4istat_intr;
|
|
test SEQINTSRC, SAVEPTRS jnz saveptr_intr;
|
|
test SEQINTSRC, CFG4ICMD jnz cfg4icmd_intr;
|
|
SET_SEQINTCODE(INVALID_SEQINT)
|
|
|
|
/*
|
|
* There are two types of save pointers interrupts:
|
|
* The first is a snapshot save pointers where the current FIFO is not
|
|
* active and contains a snapshot of the current poniter information.
|
|
* This happens between packets in a stream for a single L_Q. Since we
|
|
* are not performing a pointer save, we can safely clear the channel
|
|
* so it can be used for other transactions. On RTI capable controllers,
|
|
* where snapshots can, and are, disabled, the code to handle this type
|
|
* of snapshot is not active.
|
|
*
|
|
* The second case is a save pointers on an active FIFO which occurs
|
|
* if the target changes to a new L_Q or busfrees/QASes and the transfer
|
|
* has a residual. This should occur coincident with a ctxtdone. We
|
|
* disable the interrupt and allow our active routine to handle the
|
|
* save.
|
|
*/
|
|
saveptr_intr:
|
|
if ((ahd->features & AHD_RTI) == 0) {
|
|
test LONGJMP_ADDR[1], INVALID_ADDR jnz snapshot_saveptr;
|
|
}
|
|
saveptr_active_fifo:
|
|
and SEQIMODE, ~ENSAVEPTRS;
|
|
or SEQINTCTL, IRET ret;
|
|
|
|
cfg4data_intr:
|
|
test SCB_SGPTR[0], SG_LIST_NULL jnz pkt_handle_overrun_inc_use_count;
|
|
call load_first_seg;
|
|
call pkt_handle_xfer;
|
|
inc SCB_FIFO_USE_COUNT;
|
|
interrupt_return:
|
|
or SEQINTCTL, IRET ret;
|
|
|
|
cfg4istat_intr:
|
|
call freeze_queue;
|
|
add NONE, -13, SCB_CDB_LEN;
|
|
jnc cfg4istat_have_sense_addr;
|
|
test SCB_CDB_LEN, SCB_CDB_LEN_PTR jnz cfg4istat_have_sense_addr;
|
|
/*
|
|
* Host sets up address/count and enables transfer.
|
|
*/
|
|
SET_SEQINTCODE(CFG4ISTAT_INTR)
|
|
jmp cfg4istat_setup_handler;
|
|
cfg4istat_have_sense_addr:
|
|
bmov HADDR, SCB_SENSE_BUSADDR, 4;
|
|
mvi HCNT[1], (AHD_SENSE_BUFSIZE >> 8);
|
|
mvi SG_CACHE_PRE, LAST_SEG;
|
|
mvi DFCNTRL, PRELOADEN|SCSIEN|HDMAEN;
|
|
cfg4istat_setup_handler:
|
|
/*
|
|
* Status pkt is transferring to host.
|
|
* Wait in idle loop for transfer to complete.
|
|
* If a command completed before an attempted
|
|
* task management function completed, notify the host.
|
|
*/
|
|
test SCB_TASK_MANAGEMENT, 0xFF jz cfg4istat_no_taskmgmt_func;
|
|
SET_SEQINTCODE(TASKMGMT_CMD_CMPLT_OKAY)
|
|
cfg4istat_no_taskmgmt_func:
|
|
call pkt_handle_status;
|
|
or SEQINTCTL, IRET ret;
|
|
|
|
cfg4icmd_intr:
|
|
/*
|
|
* In the case of DMAing a CDB from the host, the normal
|
|
* CDB buffer is formatted with an 8 byte address followed
|
|
* by a 1 byte count.
|
|
*/
|
|
bmov HADDR[0], SCB_HOST_CDB_PTR, 9;
|
|
mvi SG_CACHE_PRE, LAST_SEG;
|
|
mvi DFCNTRL, (PRELOADEN|SCSIEN|HDMAEN);
|
|
call pkt_handle_cdb;
|
|
or SEQINTCTL, IRET ret;
|
|
|
|
/*
|
|
* See if the target has gone on in this context creating an
|
|
* overrun condition. For the write case, the hardware cannot
|
|
* ack bytes until data are provided. So, if the target begins
|
|
* another packet without changing contexts, implying we are
|
|
* not sitting on a packet boundary, we are in an overrun
|
|
* situation. For the read case, the hardware will continue to
|
|
* ack bytes into the FIFO, and may even ack the last overrun packet
|
|
* into the FIFO. If the FIFO should become non-empty, we are in
|
|
* a read overrun case.
|
|
*/
|
|
#define check_overrun \
|
|
/* Not on a packet boundary. */ \
|
|
test MDFFSTAT, DLZERO jz pkt_handle_overrun; \
|
|
test DFSTATUS, FIFOEMP jz pkt_handle_overrun
|
|
|
|
pkt_handle_xfer:
|
|
test SG_STATE, LOADING_NEEDED jz pkt_last_seg;
|
|
call setjmp;
|
|
test SEQINTSRC, SAVEPTRS jnz pkt_saveptrs;
|
|
test SCSIPHASE, ~DATA_PHASE_MASK jz . + 2;
|
|
test SCSISIGO, ATNO jnz . + 2;
|
|
test SSTAT2, NONPACKREQ jz pkt_service_fifo;
|
|
/*
|
|
* Defer handling of this NONPACKREQ until we
|
|
* can be sure it pertains to this FIFO. SAVEPTRS
|
|
* will not be asserted if the NONPACKREQ is for us,
|
|
* so we must simulate it if shaddow is valid. If
|
|
* shaddow is not valid, keep running this FIFO until we
|
|
* have satisfied the transfer by loading segments and
|
|
* waiting for either shaddow valid or last_seg_done.
|
|
*/
|
|
test MDFFSTAT, SHVALID jnz pkt_saveptrs;
|
|
pkt_service_fifo:
|
|
test SG_STATE, LOADING_NEEDED jnz service_fifo;
|
|
pkt_last_seg:
|
|
call setjmp;
|
|
test SEQINTSRC, SAVEPTRS jnz pkt_saveptrs;
|
|
test SG_CACHE_SHADOW, LAST_SEG_DONE jnz pkt_last_seg_done;
|
|
test SCSIPHASE, ~DATA_PHASE_MASK jz . + 2;
|
|
test SCSISIGO, ATNO jnz . + 2;
|
|
test SSTAT2, NONPACKREQ jz return;
|
|
test MDFFSTAT, SHVALID jz return;
|
|
/* FALLTHROUGH */
|
|
|
|
/*
|
|
* Either a SAVEPTRS interrupt condition is pending for this FIFO
|
|
* or we have a pending NONPACKREQ for this FIFO. We differentiate
|
|
* between the two by capturing the state of the SAVEPTRS interrupt
|
|
* prior to clearing this status and executing the common code for
|
|
* these two cases.
|
|
*/
|
|
pkt_saveptrs:
|
|
BEGIN_CRITICAL;
|
|
if ((ahd->bugs & AHD_AUTOFLUSH_BUG) != 0) {
|
|
or DFCNTRL, FIFOFLUSH;
|
|
}
|
|
mov REG0, SEQINTSRC;
|
|
call calc_residual;
|
|
call save_pointers;
|
|
mvi CLRSEQINTSRC, CLRSAVEPTRS;
|
|
call disable_ccsgen;
|
|
or SEQIMODE, ENSAVEPTRS;
|
|
test DFCNTRL, DIRECTION jnz pkt_saveptrs_check_status;
|
|
test DFSTATUS, FIFOEMP jnz pkt_saveptrs_check_status;
|
|
/*
|
|
* Keep a handler around for this FIFO until it drains
|
|
* to the host to guarantee that we don't complete the
|
|
* command to the host before the data arrives.
|
|
*/
|
|
pkt_saveptrs_wait_fifoemp:
|
|
call setjmp;
|
|
test DFSTATUS, FIFOEMP jz return;
|
|
pkt_saveptrs_check_status:
|
|
or LONGJMP_ADDR[1], INVALID_ADDR;
|
|
test REG0, SAVEPTRS jz unexpected_nonpkt_phase;
|
|
dec SCB_FIFO_USE_COUNT;
|
|
test SCB_CONTROL, STATUS_RCVD jnz pkt_complete_scb_if_fifos_idle;
|
|
mvi DFFSXFRCTL, CLRCHN ret;
|
|
END_CRITICAL;
|
|
|
|
/*
|
|
* LAST_SEG_DONE status has been seen in the current FIFO.
|
|
* This indicates that all of the allowed data for this
|
|
* command has transferred across the SCSI and host buses.
|
|
* Check for overrun and see if we can complete this command.
|
|
*/
|
|
pkt_last_seg_done:
|
|
BEGIN_CRITICAL;
|
|
/*
|
|
* Mark transfer as completed.
|
|
*/
|
|
or SCB_SGPTR, SG_LIST_NULL;
|
|
|
|
/*
|
|
* Wait for the current context to finish to verify that
|
|
* no overrun condition has occurred.
|
|
*/
|
|
test SEQINTSRC, CTXTDONE jnz pkt_ctxt_done;
|
|
call setjmp;
|
|
pkt_wait_ctxt_done_loop:
|
|
test SEQINTSRC, CTXTDONE jnz pkt_ctxt_done;
|
|
/*
|
|
* A sufficiently large overrun or a NONPACKREQ may
|
|
* prevent CTXTDONE from ever asserting, so we must
|
|
* poll for these statuses too.
|
|
*/
|
|
check_overrun;
|
|
test SSTAT2, NONPACKREQ jz return;
|
|
test SEQINTSRC, CTXTDONE jz unexpected_nonpkt_phase;
|
|
/* FALLTHROUGH */
|
|
|
|
pkt_ctxt_done:
|
|
check_overrun;
|
|
or LONGJMP_ADDR[1], INVALID_ADDR;
|
|
/*
|
|
* If status has been received, it is safe to skip
|
|
* the check to see if another FIFO is active because
|
|
* LAST_SEG_DONE has been observed. However, we check
|
|
* the FIFO anyway since it costs us only one extra
|
|
* instruction to leverage common code to perform the
|
|
* SCB completion.
|
|
*/
|
|
dec SCB_FIFO_USE_COUNT;
|
|
test SCB_CONTROL, STATUS_RCVD jnz pkt_complete_scb_if_fifos_idle;
|
|
mvi DFFSXFRCTL, CLRCHN ret;
|
|
END_CRITICAL;
|
|
|
|
/*
|
|
* Must wait until CDB xfer is over before issuing the
|
|
* clear channel.
|
|
*/
|
|
pkt_handle_cdb:
|
|
call setjmp;
|
|
test SG_CACHE_SHADOW, LAST_SEG_DONE jz return;
|
|
or LONGJMP_ADDR[1], INVALID_ADDR;
|
|
mvi DFFSXFRCTL, CLRCHN ret;
|
|
|
|
/*
|
|
* Watch over the status transfer. Our host sense buffer is
|
|
* large enough to take the maximum allowed status packet.
|
|
* None-the-less, we must still catch and report overruns to
|
|
* the host. Additionally, properly catch unexpected non-packet
|
|
* phases that are typically caused by CRC errors in status packet
|
|
* transmission.
|
|
*/
|
|
pkt_handle_status:
|
|
call setjmp;
|
|
test SG_CACHE_SHADOW, LAST_SEG_DONE jnz pkt_status_check_overrun;
|
|
test SEQINTSRC, CTXTDONE jz pkt_status_check_nonpackreq;
|
|
test SG_CACHE_SHADOW, LAST_SEG_DONE jnz pkt_status_check_overrun;
|
|
pkt_status_IU_done:
|
|
if ((ahd->bugs & AHD_AUTOFLUSH_BUG) != 0) {
|
|
or DFCNTRL, FIFOFLUSH;
|
|
}
|
|
test DFSTATUS, FIFOEMP jz return;
|
|
BEGIN_CRITICAL;
|
|
or LONGJMP_ADDR[1], INVALID_ADDR;
|
|
mvi SCB_SCSI_STATUS, STATUS_PKT_SENSE;
|
|
or SCB_CONTROL, STATUS_RCVD;
|
|
jmp pkt_complete_scb_if_fifos_idle;
|
|
END_CRITICAL;
|
|
pkt_status_check_overrun:
|
|
/*
|
|
* Status PKT overruns are uncerimoniously recovered with a
|
|
* bus reset. If we've overrun, let the host know so that
|
|
* recovery can be performed.
|
|
*
|
|
* LAST_SEG_DONE has been observed. If either CTXTDONE or
|
|
* a NONPACKREQ phase change have occurred and the FIFO is
|
|
* empty, there is no overrun.
|
|
*/
|
|
test DFSTATUS, FIFOEMP jz pkt_status_report_overrun;
|
|
test SEQINTSRC, CTXTDONE jz . + 2;
|
|
test DFSTATUS, FIFOEMP jnz pkt_status_IU_done;
|
|
test SCSIPHASE, ~DATA_PHASE_MASK jz return;
|
|
test DFSTATUS, FIFOEMP jnz pkt_status_check_nonpackreq;
|
|
pkt_status_report_overrun:
|
|
SET_SEQINTCODE(STATUS_OVERRUN)
|
|
/* SEQUENCER RESTARTED */
|
|
pkt_status_check_nonpackreq:
|
|
/*
|
|
* CTXTDONE may be held off if a NONPACKREQ is associated with
|
|
* the current context. If a NONPACKREQ is observed, decide
|
|
* if it is for the current context. If it is for the current
|
|
* context, we must defer NONPACKREQ processing until all data
|
|
* has transferred to the host.
|
|
*/
|
|
test SCSIPHASE, ~DATA_PHASE_MASK jz return;
|
|
test SCSISIGO, ATNO jnz . + 2;
|
|
test SSTAT2, NONPACKREQ jz return;
|
|
test SEQINTSRC, CTXTDONE jnz pkt_status_IU_done;
|
|
test DFSTATUS, FIFOEMP jz return;
|
|
/*
|
|
* The unexpected nonpkt phase handler assumes that any
|
|
* data channel use will have a FIFO reference count. It
|
|
* turns out that the status handler doesn't need a refernce
|
|
* count since the status received flag, and thus completion
|
|
* processing, cannot be set until the handler is finished.
|
|
* We increment the count here to make the nonpkt handler
|
|
* happy.
|
|
*/
|
|
inc SCB_FIFO_USE_COUNT;
|
|
/* FALLTHROUGH */
|
|
|
|
/*
|
|
* Nonpackreq is a polled status. It can come true in three situations:
|
|
* we have received an L_Q, we have sent one or more L_Qs, or there is no
|
|
* L_Q context associated with this REQ (REQ occurs immediately after a
|
|
* (re)selection). Routines that know that the context responsible for this
|
|
* nonpackreq call directly into unexpected_nonpkt_phase. In the case of the
|
|
* top level idle loop, we exhaust all active contexts prior to determining that
|
|
* we simply do not have the full I_T_L_Q for this phase.
|
|
*/
|
|
unexpected_nonpkt_phase_find_ctxt:
|
|
/*
|
|
* This nonpackreq is most likely associated with one of the tags
|
|
* in a FIFO or an outgoing LQ. Only treat it as an I_T only
|
|
* nonpackreq if we've cleared out the FIFOs and handled any
|
|
* pending SELDO.
|
|
*/
|
|
SET_SRC_MODE M_SCSI;
|
|
SET_DST_MODE M_SCSI;
|
|
and A, FIFO1FREE|FIFO0FREE, DFFSTAT;
|
|
cmp A, FIFO1FREE|FIFO0FREE jne return;
|
|
test SSTAT0, SELDO jnz return;
|
|
mvi SCBPTR[1], SCB_LIST_NULL;
|
|
unexpected_nonpkt_phase:
|
|
test MODE_PTR, ~(MK_MODE(M_DFF1, M_DFF1))
|
|
jnz unexpected_nonpkt_mode_cleared;
|
|
SET_SRC_MODE M_DFF0;
|
|
SET_DST_MODE M_DFF0;
|
|
or LONGJMP_ADDR[1], INVALID_ADDR;
|
|
dec SCB_FIFO_USE_COUNT;
|
|
mvi DFFSXFRCTL, CLRCHN;
|
|
unexpected_nonpkt_mode_cleared:
|
|
mvi CLRSINT2, CLRNONPACKREQ;
|
|
test SCSIPHASE, ~(MSG_IN_PHASE|MSG_OUT_PHASE) jnz illegal_phase;
|
|
SET_SEQINTCODE(ENTERING_NONPACK)
|
|
jmp ITloop;
|
|
|
|
illegal_phase:
|
|
SET_SEQINTCODE(ILLEGAL_PHASE)
|
|
jmp ITloop;
|
|
|
|
/*
|
|
* We have entered an overrun situation. If we have working
|
|
* BITBUCKET, flip that on and let the hardware eat any overrun
|
|
* data. Otherwise use an overrun buffer in the host to simulate
|
|
* BITBUCKET.
|
|
*/
|
|
pkt_handle_overrun_inc_use_count:
|
|
inc SCB_FIFO_USE_COUNT;
|
|
pkt_handle_overrun:
|
|
SET_SEQINTCODE(CFG4OVERRUN)
|
|
call freeze_queue;
|
|
if ((ahd->bugs & AHD_PKT_BITBUCKET_BUG) == 0) {
|
|
or DFFSXFRCTL, DFFBITBUCKET;
|
|
SET_SRC_MODE M_DFF1;
|
|
SET_DST_MODE M_DFF1;
|
|
} else {
|
|
call load_overrun_buf;
|
|
mvi DFCNTRL, (HDMAEN|SCSIEN|PRELOADEN);
|
|
}
|
|
call setjmp;
|
|
if ((ahd->bugs & AHD_PKT_BITBUCKET_BUG) != 0) {
|
|
test DFSTATUS, PRELOAD_AVAIL jz overrun_load_done;
|
|
call load_overrun_buf;
|
|
or DFCNTRL, PRELOADEN;
|
|
overrun_load_done:
|
|
test SEQINTSRC, CTXTDONE jnz pkt_overrun_end;
|
|
} else {
|
|
test DFFSXFRCTL, DFFBITBUCKET jz pkt_overrun_end;
|
|
}
|
|
test SSTAT2, NONPACKREQ jz return;
|
|
pkt_overrun_end:
|
|
or SCB_RESIDUAL_SGPTR, SG_OVERRUN_RESID;
|
|
test SEQINTSRC, CTXTDONE jz unexpected_nonpkt_phase;
|
|
dec SCB_FIFO_USE_COUNT;
|
|
or LONGJMP_ADDR[1], INVALID_ADDR;
|
|
test SCB_CONTROL, STATUS_RCVD jnz pkt_complete_scb_if_fifos_idle;
|
|
mvi DFFSXFRCTL, CLRCHN ret;
|
|
|
|
if ((ahd->bugs & AHD_PKT_BITBUCKET_BUG) != 0) {
|
|
load_overrun_buf:
|
|
/*
|
|
* Load a dummy segment if preload space is available.
|
|
*/
|
|
mov HADDR[0], SHARED_DATA_ADDR;
|
|
add HADDR[1], PKT_OVERRUN_BUFOFFSET, SHARED_DATA_ADDR[1];
|
|
mov ACCUM_SAVE, A;
|
|
clr A;
|
|
adc HADDR[2], A, SHARED_DATA_ADDR[2];
|
|
adc HADDR[3], A, SHARED_DATA_ADDR[3];
|
|
mov A, ACCUM_SAVE;
|
|
bmov HADDR[4], ALLZEROS, 4;
|
|
/* PKT_OVERRUN_BUFSIZE is a multiple of 256 */
|
|
clr HCNT[0];
|
|
mvi HCNT[1], ((PKT_OVERRUN_BUFSIZE >> 8) & 0xFF);
|
|
clr HCNT[2] ret;
|
|
}
|