2402 lines
69 KiB
Plaintext
2402 lines
69 KiB
Plaintext
/*-
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* Adaptec 274x/284x/294x 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) 2000-2001 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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VERSION = "$Id: //depot/aic7xxx/aic7xxx/aic7xxx.seq#58 $"
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PATCH_ARG_LIST = "struct ahc_softc *ahc"
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PREFIX = "ahc_"
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#include "aic7xxx.reg"
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#include "scsi_message.h"
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/*
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* A few words on the waiting SCB list:
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* After starting the selection hardware, we check for reconnecting targets
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* as well as for our selection to complete just in case the reselection wins
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* bus arbitration. The problem with this is that we must keep track of the
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* SCB that we've already pulled from the QINFIFO and started the selection
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* on just in case the reselection wins so that we can retry the selection at
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* a later time. This problem cannot be resolved by holding a single entry
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* in scratch ram since a reconnecting target can request sense and this will
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* create yet another SCB waiting for selection. The solution used here is to
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* use byte 27 of the SCB as a pseudo-next pointer and to thread a list
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* of SCBs that are awaiting selection. Since 0-0xfe are valid SCB indexes,
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* SCB_LIST_NULL is 0xff which is out of range. An entry is also added to
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* this list every time a request sense occurs or after completing a non-tagged
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* command for which a second SCB has been queued. The sequencer will
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* automatically consume the entries.
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*/
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bus_free_sel:
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/*
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* Turn off the selection hardware. We need to reset the
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* selection request in order to perform a new selection.
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*/
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and SCSISEQ, TEMODE|ENSELI|ENRSELI|ENAUTOATNP;
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and SIMODE1, ~ENBUSFREE;
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poll_for_work:
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call clear_target_state;
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and SXFRCTL0, ~SPIOEN;
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if ((ahc->features & AHC_ULTRA2) != 0) {
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clr SCSIBUSL;
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}
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test SCSISEQ, ENSELO jnz poll_for_selection;
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if ((ahc->features & AHC_TWIN) != 0) {
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xor SBLKCTL,SELBUSB; /* Toggle to the other bus */
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test SCSISEQ, ENSELO jnz poll_for_selection;
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}
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BEGIN_CRITICAL;
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cmp WAITING_SCBH,SCB_LIST_NULL jne start_waiting;
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END_CRITICAL;
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poll_for_work_loop:
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if ((ahc->features & AHC_TWIN) != 0) {
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xor SBLKCTL,SELBUSB; /* Toggle to the other bus */
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}
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test SSTAT0, SELDO|SELDI jnz selection;
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test_queue:
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/* Has the driver posted any work for us? */
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BEGIN_CRITICAL;
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if ((ahc->features & AHC_QUEUE_REGS) != 0) {
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test QOFF_CTLSTA, SCB_AVAIL jz poll_for_work_loop;
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} else {
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mov A, QINPOS;
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cmp KERNEL_QINPOS, A je poll_for_work_loop;
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}
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mov ARG_1, NEXT_QUEUED_SCB;
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/*
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* We have at least one queued SCB now and we don't have any
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* SCBs in the list of SCBs awaiting selection. Allocate a
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* card SCB for the host's SCB and get to work on it.
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*/
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if ((ahc->flags & AHC_PAGESCBS) != 0) {
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mov ALLZEROS call get_free_or_disc_scb;
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} else {
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/* In the non-paging case, the SCBID == hardware SCB index */
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mov SCBPTR, ARG_1;
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}
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or SEQ_FLAGS2, SCB_DMA;
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END_CRITICAL;
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dma_queued_scb:
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/*
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* DMA the SCB from host ram into the current SCB location.
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*/
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mvi DMAPARAMS, HDMAEN|DIRECTION|FIFORESET;
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mov ARG_1 call dma_scb;
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/*
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* Check one last time to see if this SCB was canceled
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* before we completed the DMA operation. If it was,
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* the QINFIFO next pointer will not match our saved
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* value.
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*/
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mov A, ARG_1;
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BEGIN_CRITICAL;
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cmp NEXT_QUEUED_SCB, A jne abort_qinscb;
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if ((ahc->flags & AHC_SEQUENCER_DEBUG) != 0) {
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cmp SCB_TAG, A je . + 2;
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mvi SCB_MISMATCH call set_seqint;
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}
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mov NEXT_QUEUED_SCB, SCB_NEXT;
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mov SCB_NEXT,WAITING_SCBH;
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mov WAITING_SCBH, SCBPTR;
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if ((ahc->features & AHC_QUEUE_REGS) != 0) {
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mov NONE, SNSCB_QOFF;
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} else {
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inc QINPOS;
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}
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and SEQ_FLAGS2, ~SCB_DMA;
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start_waiting:
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/*
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* Start the first entry on the waiting SCB list.
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*/
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mov SCBPTR, WAITING_SCBH;
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call start_selection;
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END_CRITICAL;
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poll_for_selection:
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/*
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* Twin channel devices cannot handle things like SELTO
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* interrupts on the "background" channel. So, while
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* selecting, keep polling the current channel until
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* either a selection or reselection occurs.
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*/
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test SSTAT0, SELDO|SELDI jz poll_for_selection;
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selection:
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/*
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* We aren't expecting a bus free, so interrupt
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* the kernel driver if it happens.
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*/
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mvi CLRSINT1,CLRBUSFREE;
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if ((ahc->features & AHC_DT) == 0) {
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or SIMODE1, ENBUSFREE;
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}
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/*
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* Guard against a bus free after (re)selection
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* but prior to enabling the busfree interrupt. SELDI
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* and SELDO will be cleared in that case.
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*/
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test SSTAT0, SELDI|SELDO jz bus_free_sel;
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test SSTAT0,SELDO jnz select_out;
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select_in:
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if ((ahc->flags & AHC_TARGETROLE) != 0) {
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if ((ahc->flags & AHC_INITIATORROLE) != 0) {
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test SSTAT0, TARGET jz initiator_reselect;
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}
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mvi CLRSINT0, CLRSELDI;
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/*
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* We've just been selected. Assert BSY and
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* setup the phase for receiving messages
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* from the target.
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*/
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mvi SCSISIGO, P_MESGOUT|BSYO;
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/*
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* Setup the DMA for sending the identify and
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* command information.
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*/
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mvi SEQ_FLAGS, CMDPHASE_PENDING;
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mov A, TQINPOS;
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if ((ahc->features & AHC_CMD_CHAN) != 0) {
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mvi DINDEX, CCHADDR;
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mvi SHARED_DATA_ADDR call set_32byte_addr;
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mvi CCSCBCTL, CCSCBRESET;
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} else {
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mvi DINDEX, HADDR;
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mvi SHARED_DATA_ADDR call set_32byte_addr;
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mvi DFCNTRL, FIFORESET;
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}
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/* Initiator that selected us */
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and SAVED_SCSIID, SELID_MASK, SELID;
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/* The Target ID we were selected at */
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if ((ahc->features & AHC_MULTI_TID) != 0) {
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and A, OID, TARGIDIN;
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} else if ((ahc->features & AHC_ULTRA2) != 0) {
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and A, OID, SCSIID_ULTRA2;
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} else {
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and A, OID, SCSIID;
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}
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or SAVED_SCSIID, A;
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if ((ahc->features & AHC_TWIN) != 0) {
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test SBLKCTL, SELBUSB jz . + 2;
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or SAVED_SCSIID, TWIN_CHNLB;
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}
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if ((ahc->features & AHC_CMD_CHAN) != 0) {
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mov CCSCBRAM, SAVED_SCSIID;
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} else {
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mov DFDAT, SAVED_SCSIID;
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}
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/*
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* If ATN isn't asserted, the target isn't interested
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* in talking to us. Go directly to bus free.
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* XXX SCSI-1 may require us to assume lun 0 if
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* ATN is false.
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*/
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test SCSISIGI, ATNI jz target_busfree;
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/*
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* Watch ATN closely now as we pull in messages from the
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* initiator. We follow the guidlines from section 6.5
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* of the SCSI-2 spec for what messages are allowed when.
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*/
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call target_inb;
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/*
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* Our first message must be one of IDENTIFY, ABORT, or
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* BUS_DEVICE_RESET.
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*/
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test DINDEX, MSG_IDENTIFYFLAG jz host_target_message_loop;
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/* Store for host */
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if ((ahc->features & AHC_CMD_CHAN) != 0) {
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mov CCSCBRAM, DINDEX;
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} else {
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mov DFDAT, DINDEX;
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}
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and SAVED_LUN, MSG_IDENTIFY_LUNMASK, DINDEX;
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/* Remember for disconnection decision */
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test DINDEX, MSG_IDENTIFY_DISCFLAG jnz . + 2;
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/* XXX Honor per target settings too */
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or SEQ_FLAGS, NO_DISCONNECT;
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test SCSISIGI, ATNI jz ident_messages_done;
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call target_inb;
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/*
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* If this is a tagged request, the tagged message must
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* immediately follow the identify. We test for a valid
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* tag message by seeing if it is >= MSG_SIMPLE_Q_TAG and
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* < MSG_IGN_WIDE_RESIDUE.
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*/
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add A, -MSG_SIMPLE_Q_TAG, DINDEX;
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jnc ident_messages_done_msg_pending;
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add A, -MSG_IGN_WIDE_RESIDUE, DINDEX;
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jc ident_messages_done_msg_pending;
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/* Store for host */
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if ((ahc->features & AHC_CMD_CHAN) != 0) {
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mov CCSCBRAM, DINDEX;
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} else {
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mov DFDAT, DINDEX;
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}
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/*
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* If the initiator doesn't feel like providing a tag number,
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* we've got a failed selection and must transition to bus
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* free.
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*/
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test SCSISIGI, ATNI jz target_busfree;
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/*
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* Store the tag for the host.
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*/
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call target_inb;
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if ((ahc->features & AHC_CMD_CHAN) != 0) {
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mov CCSCBRAM, DINDEX;
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} else {
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mov DFDAT, DINDEX;
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}
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mov INITIATOR_TAG, DINDEX;
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or SEQ_FLAGS, TARGET_CMD_IS_TAGGED;
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ident_messages_done:
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/* Terminate the ident list */
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if ((ahc->features & AHC_CMD_CHAN) != 0) {
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mvi CCSCBRAM, SCB_LIST_NULL;
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} else {
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mvi DFDAT, SCB_LIST_NULL;
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}
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or SEQ_FLAGS, TARG_CMD_PENDING;
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test SEQ_FLAGS2, TARGET_MSG_PENDING
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jnz target_mesgout_pending;
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test SCSISIGI, ATNI jnz target_mesgout_continue;
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jmp target_ITloop;
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ident_messages_done_msg_pending:
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or SEQ_FLAGS2, TARGET_MSG_PENDING;
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jmp ident_messages_done;
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/*
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* Pushed message loop to allow the kernel to
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* run it's own target mode message state engine.
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*/
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host_target_message_loop:
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mvi HOST_MSG_LOOP call set_seqint;
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cmp RETURN_1, EXIT_MSG_LOOP je target_ITloop;
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test SSTAT0, SPIORDY jz .;
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jmp host_target_message_loop;
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}
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if ((ahc->flags & AHC_INITIATORROLE) != 0) {
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/*
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* Reselection has been initiated by a target. Make a note that we've been
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* reselected, but haven't seen an IDENTIFY message from the target yet.
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*/
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initiator_reselect:
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/* XXX test for and handle ONE BIT condition */
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or SXFRCTL0, SPIOEN|CLRSTCNT|CLRCHN;
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and SAVED_SCSIID, SELID_MASK, SELID;
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if ((ahc->features & AHC_ULTRA2) != 0) {
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and A, OID, SCSIID_ULTRA2;
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} else {
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and A, OID, SCSIID;
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}
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or SAVED_SCSIID, A;
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if ((ahc->features & AHC_TWIN) != 0) {
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test SBLKCTL, SELBUSB jz . + 2;
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or SAVED_SCSIID, TWIN_CHNLB;
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}
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mvi CLRSINT0, CLRSELDI;
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jmp ITloop;
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}
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abort_qinscb:
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call add_scb_to_free_list;
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jmp poll_for_work_loop;
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BEGIN_CRITICAL;
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start_selection:
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/*
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* If bus reset interrupts have been disabled (from a previous
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* reset), re-enable them now. Resets are only of interest
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* when we have outstanding transactions, so we can safely
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* defer re-enabling the interrupt until, as an initiator,
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* we start sending out transactions again.
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*/
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test SIMODE1, ENSCSIRST jnz . + 3;
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mvi CLRSINT1, CLRSCSIRSTI;
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or SIMODE1, ENSCSIRST;
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if ((ahc->features & AHC_TWIN) != 0) {
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and SINDEX,~SELBUSB,SBLKCTL;/* Clear channel select bit */
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test SCB_SCSIID, TWIN_CHNLB jz . + 2;
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or SINDEX, SELBUSB;
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mov SBLKCTL,SINDEX; /* select channel */
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}
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initialize_scsiid:
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if ((ahc->features & AHC_ULTRA2) != 0) {
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mov SCSIID_ULTRA2, SCB_SCSIID;
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} else if ((ahc->features & AHC_TWIN) != 0) {
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and SCSIID, TWIN_TID|OID, SCB_SCSIID;
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} else {
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mov SCSIID, SCB_SCSIID;
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}
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if ((ahc->flags & AHC_TARGETROLE) != 0) {
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mov SINDEX, SCSISEQ_TEMPLATE;
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test SCB_CONTROL, TARGET_SCB jz . + 2;
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or SINDEX, TEMODE;
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mov SCSISEQ, SINDEX ret;
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} else {
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mov SCSISEQ, SCSISEQ_TEMPLATE ret;
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}
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END_CRITICAL;
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/*
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* Initialize transfer settings with SCB provided settings.
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*/
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set_transfer_settings:
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if ((ahc->features & AHC_ULTRA) != 0) {
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test SCB_CONTROL, ULTRAENB jz . + 2;
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or SXFRCTL0, FAST20;
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}
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/*
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* Initialize SCSIRATE with the appropriate value for this target.
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*/
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if ((ahc->features & AHC_ULTRA2) != 0) {
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bmov SCSIRATE, SCB_SCSIRATE, 2 ret;
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} else {
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mov SCSIRATE, SCB_SCSIRATE ret;
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}
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if ((ahc->flags & AHC_TARGETROLE) != 0) {
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/*
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* We carefully toggle SPIOEN to allow us to return the
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* message byte we receive so it can be checked prior to
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* driving REQ on the bus for the next byte.
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*/
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target_inb:
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/*
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* Drive REQ on the bus by enabling SCSI PIO.
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*/
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or SXFRCTL0, SPIOEN;
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/* Wait for the byte */
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test SSTAT0, SPIORDY jz .;
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/* Prevent our read from triggering another REQ */
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and SXFRCTL0, ~SPIOEN;
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/* Save latched contents */
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mov DINDEX, SCSIDATL ret;
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}
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/*
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* After the selection, remove this SCB from the "waiting SCB"
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* list. This is achieved by simply moving our "next" pointer into
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* WAITING_SCBH. Our next pointer will be set to null the next time this
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* SCB is used, so don't bother with it now.
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*/
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select_out:
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/* Turn off the selection hardware */
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and SCSISEQ, TEMODE|ENSELI|ENRSELI|ENAUTOATNP, SCSISEQ;
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mov SCBPTR, WAITING_SCBH;
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mov WAITING_SCBH,SCB_NEXT;
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mov SAVED_SCSIID, SCB_SCSIID;
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and SAVED_LUN, LID, SCB_LUN;
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call set_transfer_settings;
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if ((ahc->flags & AHC_TARGETROLE) != 0) {
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test SSTAT0, TARGET jz initiator_select;
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or SXFRCTL0, CLRSTCNT|CLRCHN;
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/*
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* Put tag in connonical location since not
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* all connections have an SCB.
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*/
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mov INITIATOR_TAG, SCB_TARGET_ITAG;
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/*
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* We've just re-selected an initiator.
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* Assert BSY and setup the phase for
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* sending our identify messages.
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*/
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mvi P_MESGIN|BSYO call change_phase;
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mvi CLRSINT0, CLRSELDO;
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/*
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* Start out with a simple identify message.
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*/
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or SAVED_LUN, MSG_IDENTIFYFLAG call target_outb;
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/*
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* If we are the result of a tagged command, send
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* a simple Q tag and the tag id.
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*/
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test SCB_CONTROL, TAG_ENB jz . + 3;
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mvi MSG_SIMPLE_Q_TAG call target_outb;
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mov SCB_TARGET_ITAG call target_outb;
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target_synccmd:
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/*
|
|
* Now determine what phases the host wants us
|
|
* to go through.
|
|
*/
|
|
mov SEQ_FLAGS, SCB_TARGET_PHASES;
|
|
|
|
test SCB_CONTROL, MK_MESSAGE jz target_ITloop;
|
|
mvi P_MESGIN|BSYO call change_phase;
|
|
jmp host_target_message_loop;
|
|
target_ITloop:
|
|
/*
|
|
* Start honoring ATN signals now that
|
|
* we properly identified ourselves.
|
|
*/
|
|
test SCSISIGI, ATNI jnz target_mesgout;
|
|
test SEQ_FLAGS, CMDPHASE_PENDING jnz target_cmdphase;
|
|
test SEQ_FLAGS, DPHASE_PENDING jnz target_dphase;
|
|
test SEQ_FLAGS, SPHASE_PENDING jnz target_sphase;
|
|
|
|
/*
|
|
* No more work to do. Either disconnect or not depending
|
|
* on the state of NO_DISCONNECT.
|
|
*/
|
|
test SEQ_FLAGS, NO_DISCONNECT jz target_disconnect;
|
|
mvi TARG_IMMEDIATE_SCB, SCB_LIST_NULL;
|
|
call complete_target_cmd;
|
|
if ((ahc->flags & AHC_PAGESCBS) != 0) {
|
|
mov ALLZEROS call get_free_or_disc_scb;
|
|
}
|
|
cmp TARG_IMMEDIATE_SCB, SCB_LIST_NULL je .;
|
|
mvi DMAPARAMS, HDMAEN|DIRECTION|FIFORESET;
|
|
mov TARG_IMMEDIATE_SCB call dma_scb;
|
|
call set_transfer_settings;
|
|
or SXFRCTL0, CLRSTCNT|CLRCHN;
|
|
jmp target_synccmd;
|
|
|
|
target_mesgout:
|
|
mvi SCSISIGO, P_MESGOUT|BSYO;
|
|
target_mesgout_continue:
|
|
call target_inb;
|
|
target_mesgout_pending:
|
|
and SEQ_FLAGS2, ~TARGET_MSG_PENDING;
|
|
/* Local Processing goes here... */
|
|
jmp host_target_message_loop;
|
|
|
|
target_disconnect:
|
|
mvi P_MESGIN|BSYO call change_phase;
|
|
test SEQ_FLAGS, DPHASE jz . + 2;
|
|
mvi MSG_SAVEDATAPOINTER call target_outb;
|
|
mvi MSG_DISCONNECT call target_outb;
|
|
|
|
target_busfree_wait:
|
|
/* Wait for preceding I/O session to complete. */
|
|
test SCSISIGI, ACKI jnz .;
|
|
target_busfree:
|
|
and SIMODE1, ~ENBUSFREE;
|
|
if ((ahc->features & AHC_ULTRA2) != 0) {
|
|
clr SCSIBUSL;
|
|
}
|
|
clr SCSISIGO;
|
|
mvi LASTPHASE, P_BUSFREE;
|
|
call complete_target_cmd;
|
|
jmp poll_for_work;
|
|
|
|
target_cmdphase:
|
|
/*
|
|
* The target has dropped ATN (doesn't want to abort or BDR)
|
|
* and we believe this selection to be valid. If the ring
|
|
* buffer for new commands is full, return busy or queue full.
|
|
*/
|
|
if ((ahc->features & AHC_HS_MAILBOX) != 0) {
|
|
and A, HOST_TQINPOS, HS_MAILBOX;
|
|
} else {
|
|
mov A, KERNEL_TQINPOS;
|
|
}
|
|
cmp TQINPOS, A jne tqinfifo_has_space;
|
|
mvi P_STATUS|BSYO call change_phase;
|
|
test SEQ_FLAGS, TARGET_CMD_IS_TAGGED jz . + 3;
|
|
mvi STATUS_QUEUE_FULL call target_outb;
|
|
jmp target_busfree_wait;
|
|
mvi STATUS_BUSY call target_outb;
|
|
jmp target_busfree_wait;
|
|
tqinfifo_has_space:
|
|
mvi P_COMMAND|BSYO call change_phase;
|
|
call target_inb;
|
|
mov A, DINDEX;
|
|
/* Store for host */
|
|
if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
mov CCSCBRAM, A;
|
|
} else {
|
|
mov DFDAT, A;
|
|
}
|
|
|
|
/*
|
|
* Determine the number of bytes to read
|
|
* based on the command group code via table lookup.
|
|
* We reuse the first 8 bytes of the TARG_SCSIRATE
|
|
* BIOS array for this table. Count is one less than
|
|
* the total for the command since we've already fetched
|
|
* the first byte.
|
|
*/
|
|
shr A, CMD_GROUP_CODE_SHIFT;
|
|
add SINDEX, CMDSIZE_TABLE, A;
|
|
mov A, SINDIR;
|
|
|
|
test A, 0xFF jz command_phase_done;
|
|
or SXFRCTL0, SPIOEN;
|
|
command_loop:
|
|
test SSTAT0, SPIORDY jz .;
|
|
cmp A, 1 jne . + 2;
|
|
and SXFRCTL0, ~SPIOEN; /* Last Byte */
|
|
if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
mov CCSCBRAM, SCSIDATL;
|
|
} else {
|
|
mov DFDAT, SCSIDATL;
|
|
}
|
|
dec A;
|
|
test A, 0xFF jnz command_loop;
|
|
|
|
command_phase_done:
|
|
and SEQ_FLAGS, ~CMDPHASE_PENDING;
|
|
jmp target_ITloop;
|
|
|
|
target_dphase:
|
|
/*
|
|
* Data phases on the bus are from the
|
|
* perspective of the initiator. The dma
|
|
* code looks at LASTPHASE to determine the
|
|
* data direction of the DMA. Toggle it for
|
|
* target transfers.
|
|
*/
|
|
xor LASTPHASE, IOI, SCB_TARGET_DATA_DIR;
|
|
or SCB_TARGET_DATA_DIR, BSYO call change_phase;
|
|
jmp p_data;
|
|
|
|
target_sphase:
|
|
mvi P_STATUS|BSYO call change_phase;
|
|
mvi LASTPHASE, P_STATUS;
|
|
mov SCB_SCSI_STATUS call target_outb;
|
|
/* XXX Watch for ATN or parity errors??? */
|
|
mvi SCSISIGO, P_MESGIN|BSYO;
|
|
/* MSG_CMDCMPLT is 0, but we can't do an immediate of 0 */
|
|
mov ALLZEROS call target_outb;
|
|
jmp target_busfree_wait;
|
|
|
|
complete_target_cmd:
|
|
test SEQ_FLAGS, TARG_CMD_PENDING jnz . + 2;
|
|
mov SCB_TAG jmp complete_post;
|
|
if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
/* Set the valid byte */
|
|
mvi CCSCBADDR, 24;
|
|
mov CCSCBRAM, ALLONES;
|
|
mvi CCHCNT, 28;
|
|
or CCSCBCTL, CCSCBEN|CCSCBRESET;
|
|
test CCSCBCTL, CCSCBDONE jz .;
|
|
clr CCSCBCTL;
|
|
} else {
|
|
/* Set the valid byte */
|
|
or DFCNTRL, FIFORESET;
|
|
mvi DFWADDR, 3; /* Third 64bit word or byte 24 */
|
|
mov DFDAT, ALLONES;
|
|
mvi 28 call set_hcnt;
|
|
or DFCNTRL, HDMAEN|FIFOFLUSH;
|
|
call dma_finish;
|
|
}
|
|
inc TQINPOS;
|
|
mvi INTSTAT,CMDCMPLT ret;
|
|
}
|
|
|
|
if ((ahc->flags & AHC_INITIATORROLE) != 0) {
|
|
initiator_select:
|
|
or SXFRCTL0, SPIOEN|CLRSTCNT|CLRCHN;
|
|
/*
|
|
* 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;
|
|
mvi SEQ_FLAGS, NO_CDB_SENT;
|
|
mvi CLRSINT0, CLRSELDO;
|
|
|
|
/*
|
|
* 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 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;
|
|
|
|
mvi BAD_PHASE call set_seqint;
|
|
jmp ITloop; /* Try reading the bus again. */
|
|
|
|
await_busfree:
|
|
and SIMODE1, ~ENBUSFREE;
|
|
mov NONE, SCSIDATL; /* Ack the last byte */
|
|
if ((ahc->features & AHC_ULTRA2) != 0) {
|
|
clr SCSIBUSL; /* Prevent bit leakage durint SELTO */
|
|
}
|
|
and SXFRCTL0, ~SPIOEN;
|
|
mvi SEQ_FLAGS, NOT_IDENTIFIED|NO_CDB_SENT;
|
|
test SSTAT1,REQINIT|BUSFREE jz .;
|
|
test SSTAT1, BUSFREE jnz poll_for_work;
|
|
mvi MISSED_BUSFREE call set_seqint;
|
|
}
|
|
|
|
clear_target_state:
|
|
/*
|
|
* We assume that the kernel driver may reset us
|
|
* at any time, even in the middle of a DMA, so
|
|
* clear DFCNTRL too.
|
|
*/
|
|
clr DFCNTRL;
|
|
or SXFRCTL0, CLRSTCNT|CLRCHN;
|
|
|
|
/*
|
|
* We don't know the target we will connect to,
|
|
* so default to narrow transfers to avoid
|
|
* parity problems.
|
|
*/
|
|
if ((ahc->features & AHC_ULTRA2) != 0) {
|
|
bmov SCSIRATE, ALLZEROS, 2;
|
|
} else {
|
|
clr SCSIRATE;
|
|
if ((ahc->features & AHC_ULTRA) != 0) {
|
|
and SXFRCTL0, ~(FAST20);
|
|
}
|
|
}
|
|
mvi LASTPHASE, P_BUSFREE;
|
|
/* clear target specific flags */
|
|
mvi SEQ_FLAGS, NOT_IDENTIFIED|NO_CDB_SENT ret;
|
|
|
|
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 ret;
|
|
|
|
if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
disable_ccsgen:
|
|
test CCSGCTL, CCSGEN jz return;
|
|
test CCSGCTL, CCSGDONE jz .;
|
|
disable_ccsgen_fetch_done:
|
|
clr CCSGCTL;
|
|
test CCSGCTL, CCSGEN jnz .;
|
|
ret;
|
|
idle_loop:
|
|
/*
|
|
* Do we need any more segments for this transfer?
|
|
*/
|
|
test SCB_RESIDUAL_DATACNT[3], SG_LAST_SEG jnz return;
|
|
|
|
/* Did we just finish fetching segs? */
|
|
cmp CCSGCTL, CCSGEN|CCSGDONE je idle_sgfetch_complete;
|
|
|
|
/* Are we actively fetching segments? */
|
|
test CCSGCTL, CCSGEN jnz return;
|
|
|
|
/*
|
|
* Do we have any prefetch left???
|
|
*/
|
|
cmp CCSGADDR, SG_PREFETCH_CNT jne idle_sg_avail;
|
|
|
|
/*
|
|
* Need to fetch segments, but we can only do that
|
|
* if the command channel is completely idle. Make
|
|
* sure we don't have an SCB prefetch going on.
|
|
*/
|
|
test CCSCBCTL, CCSCBEN 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.
|
|
*/
|
|
mvi CCHCNT, SG_PREFETCH_CNT;
|
|
and CCHADDR[0], SG_PREFETCH_ALIGN_MASK, SCB_RESIDUAL_SGPTR;
|
|
bmov CCHADDR[1], SCB_RESIDUAL_SGPTR[1], 3;
|
|
mvi CCSGCTL, CCSGEN|CCSGRESET ret;
|
|
idle_sgfetch_complete:
|
|
call disable_ccsgen_fetch_done;
|
|
and CCSGADDR, SG_PREFETCH_ADDR_MASK, SCB_RESIDUAL_SGPTR;
|
|
idle_sg_avail:
|
|
if ((ahc->features & AHC_ULTRA2) != 0) {
|
|
/* Does the hardware have space for another SG entry? */
|
|
test DFSTATUS, PRELOAD_AVAIL jz return;
|
|
bmov HADDR, CCSGRAM, 7;
|
|
bmov SCB_RESIDUAL_DATACNT[3], CCSGRAM, 1;
|
|
if ((ahc->flags & AHC_39BIT_ADDRESSING) != 0) {
|
|
mov SCB_RESIDUAL_DATACNT[3] call set_hhaddr;
|
|
}
|
|
call sg_advance;
|
|
mov SINDEX, SCB_RESIDUAL_SGPTR[0];
|
|
test SCB_RESIDUAL_DATACNT[3], SG_LAST_SEG jz . + 2;
|
|
or SINDEX, LAST_SEG;
|
|
mov SG_CACHE_PRE, SINDEX;
|
|
/* Load the segment */
|
|
or DFCNTRL, PRELOADEN;
|
|
}
|
|
ret;
|
|
}
|
|
|
|
if ((ahc->bugs & AHC_PCI_MWI_BUG) != 0 && ahc->pci_cachesize != 0) {
|
|
/*
|
|
* Calculate the trailing portion of this S/G segment that cannot
|
|
* be transferred using memory write and invalidate PCI transactions.
|
|
* XXX Can we optimize this for PCI writes only???
|
|
*/
|
|
calc_mwi_residual:
|
|
/*
|
|
* If the ending address is on a cacheline boundary,
|
|
* there is no need for an extra segment.
|
|
*/
|
|
mov A, HCNT[0];
|
|
add A, A, HADDR[0];
|
|
and A, CACHESIZE_MASK;
|
|
test A, 0xFF jz return;
|
|
|
|
/*
|
|
* If the transfer is less than a cachline,
|
|
* there is no need for an extra segment.
|
|
*/
|
|
test HCNT[1], 0xFF jnz calc_mwi_residual_final;
|
|
test HCNT[2], 0xFF jnz calc_mwi_residual_final;
|
|
add NONE, INVERTED_CACHESIZE_MASK, HCNT[0];
|
|
jnc return;
|
|
|
|
calc_mwi_residual_final:
|
|
mov MWI_RESIDUAL, A;
|
|
not A;
|
|
inc A;
|
|
add HCNT[0], A;
|
|
adc HCNT[1], -1;
|
|
adc HCNT[2], -1 ret;
|
|
}
|
|
|
|
p_data:
|
|
test SEQ_FLAGS,NOT_IDENTIFIED|NO_CDB_SENT jz p_data_allowed;
|
|
mvi PROTO_VIOLATION call set_seqint;
|
|
p_data_allowed:
|
|
if ((ahc->features & AHC_ULTRA2) != 0) {
|
|
mvi DMAPARAMS, PRELOADEN|SCSIEN|HDMAEN;
|
|
} else {
|
|
mvi DMAPARAMS, WIDEODD|SCSIEN|SDMAEN|HDMAEN|FIFORESET;
|
|
}
|
|
test LASTPHASE, IOI jnz . + 2;
|
|
or DMAPARAMS, DIRECTION;
|
|
if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
/* We don't have any valid S/G elements */
|
|
mvi CCSGADDR, SG_PREFETCH_CNT;
|
|
}
|
|
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.
|
|
*/
|
|
mvi PDATA_REINIT call set_seqint;
|
|
jmp data_phase_loop;
|
|
|
|
data_phase_initialize:
|
|
/* We have seen a data phase for the first time */
|
|
or SEQ_FLAGS, DPHASE;
|
|
|
|
/*
|
|
* Initialize the DMA address and counter from the SCB.
|
|
* Also set SCB_RESIDUAL_SGPTR, including the LAST_SEG
|
|
* flag in the highest byte of the data count. We cannot
|
|
* modify the saved values in the SCB until we see a save
|
|
* data pointers message.
|
|
*/
|
|
if ((ahc->flags & AHC_39BIT_ADDRESSING) != 0) {
|
|
/* The lowest address byte must be loaded last. */
|
|
mov SCB_DATACNT[3] call set_hhaddr;
|
|
}
|
|
if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
bmov HADDR, SCB_DATAPTR, 7;
|
|
bmov SCB_RESIDUAL_DATACNT[3], SCB_DATACNT[3], 5;
|
|
} else {
|
|
mvi DINDEX, HADDR;
|
|
mvi SCB_DATAPTR call bcopy_7;
|
|
mvi DINDEX, SCB_RESIDUAL_DATACNT + 3;
|
|
mvi SCB_DATACNT + 3 call bcopy_5;
|
|
}
|
|
if ((ahc->bugs & AHC_PCI_MWI_BUG) != 0 && ahc->pci_cachesize != 0) {
|
|
call calc_mwi_residual;
|
|
}
|
|
and SCB_RESIDUAL_SGPTR[0], ~SG_FULL_RESID;
|
|
|
|
if ((ahc->features & AHC_ULTRA2) == 0) {
|
|
if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
bmov STCNT, HCNT, 3;
|
|
} else {
|
|
call set_stcnt_from_hcnt;
|
|
}
|
|
}
|
|
|
|
data_phase_loop:
|
|
/* Guard against overruns */
|
|
test SCB_RESIDUAL_SGPTR[0], SG_LIST_NULL jz data_phase_inbounds;
|
|
|
|
/*
|
|
* Turn on `Bit Bucket' mode, wait until the target takes
|
|
* us to another phase, and then notify the host.
|
|
*/
|
|
and DMAPARAMS, DIRECTION;
|
|
mov DFCNTRL, DMAPARAMS;
|
|
or SXFRCTL1,BITBUCKET;
|
|
if ((ahc->features & AHC_DT) == 0) {
|
|
test SSTAT1,PHASEMIS jz .;
|
|
} else {
|
|
test SCSIPHASE, DATA_PHASE_MASK jnz .;
|
|
}
|
|
and SXFRCTL1, ~BITBUCKET;
|
|
mvi DATA_OVERRUN call set_seqint;
|
|
jmp ITloop;
|
|
|
|
data_phase_inbounds:
|
|
if ((ahc->features & AHC_ULTRA2) != 0) {
|
|
mov SINDEX, SCB_RESIDUAL_SGPTR[0];
|
|
test SCB_RESIDUAL_DATACNT[3], SG_LAST_SEG jz . + 2;
|
|
or SINDEX, LAST_SEG;
|
|
mov SG_CACHE_PRE, SINDEX;
|
|
mov DFCNTRL, DMAPARAMS;
|
|
ultra2_dma_loop:
|
|
call idle_loop;
|
|
/*
|
|
* The transfer is complete if either the last segment
|
|
* completes or the target changes phase.
|
|
*/
|
|
test SG_CACHE_SHADOW, LAST_SEG_DONE jnz ultra2_dmafinish;
|
|
if ((ahc->features & AHC_DT) == 0) {
|
|
if ((ahc->flags & AHC_TARGETROLE) != 0) {
|
|
/*
|
|
* As a target, we control the phases,
|
|
* so ignore PHASEMIS.
|
|
*/
|
|
test SSTAT0, TARGET jnz ultra2_dma_loop;
|
|
}
|
|
if ((ahc->flags & AHC_INITIATORROLE) != 0) {
|
|
test SSTAT1,PHASEMIS jz ultra2_dma_loop;
|
|
}
|
|
} else {
|
|
test DFCNTRL, SCSIEN jnz ultra2_dma_loop;
|
|
}
|
|
|
|
ultra2_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.
|
|
*/
|
|
if ((ahc->bugs & AHC_AUTOFLUSH_BUG) != 0) {
|
|
/*
|
|
* On chips with broken auto-flush, start
|
|
* the flushing process now. We'll poke
|
|
* the chip from time to time to keep the
|
|
* flush process going as we complete the
|
|
* data phase.
|
|
*/
|
|
or DFCNTRL, FIFOFLUSH;
|
|
}
|
|
/*
|
|
* 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.
|
|
*/
|
|
ultra2_ensure_sg:
|
|
test SG_CACHE_SHADOW, LAST_SEG jz ultra2_shvalid;
|
|
/* Record if we've consumed all S/G entries */
|
|
test SSTAT2, SHVALID jnz residuals_correct;
|
|
or SCB_RESIDUAL_SGPTR[0], SG_LIST_NULL;
|
|
jmp residuals_correct;
|
|
|
|
ultra2_shvalid:
|
|
test SSTAT2, SHVALID jnz sgptr_fixup;
|
|
call idle_loop;
|
|
jmp ultra2_ensure_sg;
|
|
|
|
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_CACEPTR 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;
|
|
/* We are not the last seg */
|
|
and SCB_RESIDUAL_DATACNT[3], ~SG_LAST_SEG;
|
|
residuals_correct:
|
|
/*
|
|
* Go ahead and shut down the DMA engine now.
|
|
* In the future, we'll want to handle end of
|
|
* transfer messages prior to doing this, but this
|
|
* requires similar restructuring for pre-ULTRA2
|
|
* controllers.
|
|
*/
|
|
test DMAPARAMS, DIRECTION jnz ultra2_fifoempty;
|
|
ultra2_fifoflush:
|
|
if ((ahc->features & AHC_DT) == 0) {
|
|
if ((ahc->bugs & AHC_AUTOFLUSH_BUG) != 0) {
|
|
/*
|
|
* On Rev A of the aic7890, the autoflush
|
|
* feature doesn't function correctly.
|
|
* Perform an explicit manual flush. During
|
|
* a manual flush, the FIFOEMP bit becomes
|
|
* true every time the PCI FIFO empties
|
|
* regardless of the state of the SCSI FIFO.
|
|
* It can take up to 4 clock cycles for the
|
|
* SCSI FIFO to get data into the PCI FIFO
|
|
* and for FIFOEMP to de-assert. Here we
|
|
* guard against this condition by making
|
|
* sure the FIFOEMP bit stays on for 5 full
|
|
* clock cycles.
|
|
*/
|
|
or DFCNTRL, FIFOFLUSH;
|
|
test DFSTATUS, FIFOEMP jz ultra2_fifoflush;
|
|
test DFSTATUS, FIFOEMP jz ultra2_fifoflush;
|
|
test DFSTATUS, FIFOEMP jz ultra2_fifoflush;
|
|
test DFSTATUS, FIFOEMP jz ultra2_fifoflush;
|
|
}
|
|
test DFSTATUS, FIFOEMP jz ultra2_fifoflush;
|
|
} else {
|
|
/*
|
|
* We enable the auto-ack feature on DT capable
|
|
* controllers. 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.
|
|
*/
|
|
test SCB_RESIDUAL_SGPTR[0], SG_LIST_NULL
|
|
jz ultra2_wait_fifoemp;
|
|
test SG_CACHE_SHADOW, LAST_SEG_DONE jz .;
|
|
/*
|
|
* FIFOEMP can lag LAST_SEG_DONE. Wait a few
|
|
* clocks before calling this an overrun.
|
|
*/
|
|
test DFSTATUS, FIFOEMP jnz ultra2_fifoempty;
|
|
test DFSTATUS, FIFOEMP jnz ultra2_fifoempty;
|
|
test DFSTATUS, FIFOEMP jnz ultra2_fifoempty;
|
|
/* Overrun */
|
|
jmp data_phase_loop;
|
|
ultra2_wait_fifoemp:
|
|
test DFSTATUS, FIFOEMP jz .;
|
|
}
|
|
ultra2_fifoempty:
|
|
/* Don't clobber an inprogress host data transfer */
|
|
test DFSTATUS, MREQPEND jnz ultra2_fifoempty;
|
|
ultra2_dmahalt:
|
|
and DFCNTRL, ~(SCSIEN|HDMAEN);
|
|
test DFCNTRL, SCSIEN|HDMAEN jnz .;
|
|
if ((ahc->flags & AHC_39BIT_ADDRESSING) != 0) {
|
|
/*
|
|
* Keep HHADDR cleared for future, 32bit addressed
|
|
* only, DMA operations.
|
|
*
|
|
* Due to bayonette style S/G handling, our residual
|
|
* data must be "fixed up" once the transfer is halted.
|
|
* Here we fixup the HSHADDR stored in the high byte
|
|
* of the residual data cnt. By postponing the fixup,
|
|
* we can batch the clearing of HADDR with the fixup.
|
|
* If we halted on the last segment, the residual is
|
|
* already correct. If we are not on the last
|
|
* segment, copy the high address directly from HSHADDR.
|
|
* We don't need to worry about maintaining the
|
|
* SG_LAST_SEG flag as it will always be false in the
|
|
* case where an update is required.
|
|
*/
|
|
or DSCOMMAND1, HADDLDSEL0;
|
|
test SG_CACHE_SHADOW, LAST_SEG jnz . + 2;
|
|
mov SCB_RESIDUAL_DATACNT[3], SHADDR;
|
|
clr HADDR;
|
|
and DSCOMMAND1, ~HADDLDSEL0;
|
|
}
|
|
} else {
|
|
/* If we are the last SG block, tell the hardware. */
|
|
if ((ahc->bugs & AHC_PCI_MWI_BUG) != 0
|
|
&& ahc->pci_cachesize != 0) {
|
|
test MWI_RESIDUAL, 0xFF jnz dma_mid_sg;
|
|
}
|
|
test SCB_RESIDUAL_DATACNT[3], SG_LAST_SEG jz dma_mid_sg;
|
|
if ((ahc->flags & AHC_TARGETROLE) != 0) {
|
|
test SSTAT0, TARGET jz dma_last_sg;
|
|
if ((ahc->bugs & AHC_TMODE_WIDEODD_BUG) != 0) {
|
|
test DMAPARAMS, DIRECTION jz dma_mid_sg;
|
|
}
|
|
}
|
|
dma_last_sg:
|
|
and DMAPARAMS, ~WIDEODD;
|
|
dma_mid_sg:
|
|
/* Start DMA data transfer. */
|
|
mov DFCNTRL, DMAPARAMS;
|
|
dma_loop:
|
|
if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
call idle_loop;
|
|
}
|
|
test SSTAT0,DMADONE jnz dma_dmadone;
|
|
test SSTAT1,PHASEMIS jz dma_loop; /* ie. underrun */
|
|
dma_phasemis:
|
|
/*
|
|
* We will be "done" DMAing when the transfer count goes to
|
|
* zero, or the target changes the phase (in light of this,
|
|
* it makes sense that the DMA circuitry doesn't ACK when
|
|
* PHASEMIS is active). If we are doing a SCSI->Host transfer,
|
|
* the data FIFO should be flushed auto-magically on STCNT=0
|
|
* or a phase change, so just wait for FIFO empty status.
|
|
*/
|
|
dma_checkfifo:
|
|
test DFCNTRL,DIRECTION jnz dma_fifoempty;
|
|
dma_fifoflush:
|
|
test DFSTATUS,FIFOEMP jz dma_fifoflush;
|
|
dma_fifoempty:
|
|
/* Don't clobber an inprogress host data transfer */
|
|
test DFSTATUS, MREQPEND jnz dma_fifoempty;
|
|
|
|
/*
|
|
* Now shut off the DMA and make sure that the DMA
|
|
* hardware has actually stopped. Touching the DMA
|
|
* counters, etc. while a DMA is active will result
|
|
* in an ILLSADDR exception.
|
|
*/
|
|
dma_dmadone:
|
|
and DFCNTRL, ~(SCSIEN|SDMAEN|HDMAEN);
|
|
dma_halt:
|
|
/*
|
|
* Some revisions of the aic78XX have a problem where, if the
|
|
* data fifo is full, but the PCI input latch is not empty,
|
|
* HDMAEN cannot be cleared. The fix used here is to drain
|
|
* the prefetched but unused data from the data fifo until
|
|
* there is space for the input latch to drain.
|
|
*/
|
|
if ((ahc->bugs & AHC_PCI_2_1_RETRY_BUG) != 0) {
|
|
mov NONE, DFDAT;
|
|
}
|
|
test DFCNTRL, (SCSIEN|SDMAEN|HDMAEN) jnz dma_halt;
|
|
|
|
/* See if we have completed this last segment */
|
|
test STCNT[0], 0xff jnz data_phase_finish;
|
|
test STCNT[1], 0xff jnz data_phase_finish;
|
|
test STCNT[2], 0xff jnz data_phase_finish;
|
|
|
|
/*
|
|
* Advance the scatter-gather pointers if needed
|
|
*/
|
|
if ((ahc->bugs & AHC_PCI_MWI_BUG) != 0
|
|
&& ahc->pci_cachesize != 0) {
|
|
test MWI_RESIDUAL, 0xFF jz no_mwi_resid;
|
|
/*
|
|
* Reload HADDR from SHADDR and setup the
|
|
* count to be the size of our residual.
|
|
*/
|
|
if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
bmov HADDR, SHADDR, 4;
|
|
mov HCNT, MWI_RESIDUAL;
|
|
bmov HCNT[1], ALLZEROS, 2;
|
|
} else {
|
|
mvi DINDEX, HADDR;
|
|
mvi SHADDR call bcopy_4;
|
|
mov MWI_RESIDUAL call set_hcnt;
|
|
}
|
|
clr MWI_RESIDUAL;
|
|
jmp sg_load_done;
|
|
no_mwi_resid:
|
|
}
|
|
test SCB_RESIDUAL_DATACNT[3], SG_LAST_SEG jz sg_load;
|
|
or SCB_RESIDUAL_SGPTR[0], SG_LIST_NULL;
|
|
jmp data_phase_finish;
|
|
sg_load:
|
|
/*
|
|
* Load the next SG element's data address and length
|
|
* into the DMA engine. If we don't have hardware
|
|
* to perform a prefetch, we'll have to fetch the
|
|
* segment from host memory first.
|
|
*/
|
|
if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
/* Wait for the idle loop to complete */
|
|
test CCSGCTL, CCSGEN jz . + 3;
|
|
call idle_loop;
|
|
test CCSGCTL, CCSGEN jnz . - 1;
|
|
bmov HADDR, CCSGRAM, 7;
|
|
/*
|
|
* Workaround for flaky external SCB RAM
|
|
* on certain aic7895 setups. It seems
|
|
* unable to handle direct transfers from
|
|
* S/G ram to certain SCB locations.
|
|
*/
|
|
mov SINDEX, CCSGRAM;
|
|
mov SCB_RESIDUAL_DATACNT[3], SINDEX;
|
|
} else {
|
|
if ((ahc->flags & AHC_39BIT_ADDRESSING) != 0) {
|
|
mov ALLZEROS call set_hhaddr;
|
|
}
|
|
mvi DINDEX, HADDR;
|
|
mvi SCB_RESIDUAL_SGPTR call bcopy_4;
|
|
|
|
mvi SG_SIZEOF call set_hcnt;
|
|
|
|
or DFCNTRL, HDMAEN|DIRECTION|FIFORESET;
|
|
|
|
call dma_finish;
|
|
|
|
mvi DINDEX, HADDR;
|
|
call dfdat_in_7;
|
|
mov SCB_RESIDUAL_DATACNT[3], DFDAT;
|
|
}
|
|
|
|
if ((ahc->flags & AHC_39BIT_ADDRESSING) != 0) {
|
|
mov SCB_RESIDUAL_DATACNT[3] call set_hhaddr;
|
|
|
|
/*
|
|
* The lowest address byte must be loaded
|
|
* last as it triggers the computation of
|
|
* some items in the PCI block. The ULTRA2
|
|
* chips do this on PRELOAD.
|
|
*/
|
|
mov HADDR, HADDR;
|
|
}
|
|
if ((ahc->bugs & AHC_PCI_MWI_BUG) != 0
|
|
&& ahc->pci_cachesize != 0) {
|
|
call calc_mwi_residual;
|
|
}
|
|
|
|
/* Point to the new next sg in memory */
|
|
call sg_advance;
|
|
|
|
sg_load_done:
|
|
if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
bmov STCNT, HCNT, 3;
|
|
} else {
|
|
call set_stcnt_from_hcnt;
|
|
}
|
|
|
|
if ((ahc->flags & AHC_TARGETROLE) != 0) {
|
|
test SSTAT0, TARGET jnz data_phase_loop;
|
|
}
|
|
}
|
|
data_phase_finish:
|
|
/*
|
|
* If the target has left us in data phase, loop through
|
|
* the dma code again. In the case of ULTRA2 adapters,
|
|
* we should only loop if there is a data overrun. For
|
|
* all other adapters, we'll loop after each S/G element
|
|
* is loaded as well as if there is an overrun.
|
|
*/
|
|
if ((ahc->flags & AHC_TARGETROLE) != 0) {
|
|
test SSTAT0, TARGET jnz data_phase_done;
|
|
}
|
|
if ((ahc->flags & AHC_INITIATORROLE) != 0) {
|
|
test SSTAT1, REQINIT jz .;
|
|
if ((ahc->features & AHC_DT) == 0) {
|
|
test SSTAT1,PHASEMIS jz data_phase_loop;
|
|
} else {
|
|
test SCSIPHASE, DATA_PHASE_MASK jnz data_phase_loop;
|
|
}
|
|
}
|
|
|
|
data_phase_done:
|
|
/*
|
|
* After a DMA finishes, save the SG and STCNT residuals back into
|
|
* the SCB. We use STCNT instead of HCNT, since it's a reflection
|
|
* of how many bytes were transferred on the SCSI (as opposed to the
|
|
* host) bus.
|
|
*/
|
|
if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
/* Kill off any pending prefetch */
|
|
call disable_ccsgen;
|
|
}
|
|
|
|
if ((ahc->features & AHC_ULTRA2) == 0) {
|
|
/*
|
|
* Clear the high address byte so that all other DMA
|
|
* operations, which use 32bit addressing, can assume
|
|
* HHADDR is 0.
|
|
*/
|
|
if ((ahc->flags & AHC_39BIT_ADDRESSING) != 0) {
|
|
mov ALLZEROS call set_hhaddr;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Update our residual information before the information is
|
|
* lost by some other type of SCSI I/O (e.g. PIO). If we have
|
|
* transferred all data, no update is needed.
|
|
*
|
|
*/
|
|
test SCB_RESIDUAL_SGPTR, SG_LIST_NULL jnz residual_update_done;
|
|
if ((ahc->bugs & AHC_PCI_MWI_BUG) != 0
|
|
&& ahc->pci_cachesize != 0) {
|
|
if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
test MWI_RESIDUAL, 0xFF jz bmov_resid;
|
|
}
|
|
mov A, MWI_RESIDUAL;
|
|
add SCB_RESIDUAL_DATACNT[0], A, STCNT[0];
|
|
clr A;
|
|
adc SCB_RESIDUAL_DATACNT[1], A, STCNT[1];
|
|
adc SCB_RESIDUAL_DATACNT[2], A, STCNT[2];
|
|
clr MWI_RESIDUAL;
|
|
if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
jmp . + 2;
|
|
bmov_resid:
|
|
bmov SCB_RESIDUAL_DATACNT, STCNT, 3;
|
|
}
|
|
} else if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
bmov SCB_RESIDUAL_DATACNT, STCNT, 3;
|
|
} else {
|
|
mov SCB_RESIDUAL_DATACNT[0], STCNT[0];
|
|
mov SCB_RESIDUAL_DATACNT[1], STCNT[1];
|
|
mov SCB_RESIDUAL_DATACNT[2], STCNT[2];
|
|
}
|
|
residual_update_done:
|
|
/*
|
|
* Since we've been through a data phase, the SCB_RESID* fields
|
|
* are now initialized. Clear the full residual flag.
|
|
*/
|
|
and SCB_SGPTR[0], ~SG_FULL_RESID;
|
|
|
|
if ((ahc->features & AHC_ULTRA2) != 0) {
|
|
/* Clear the channel in case we return to data phase later */
|
|
or SXFRCTL0, CLRSTCNT|CLRCHN;
|
|
or SXFRCTL0, CLRSTCNT|CLRCHN;
|
|
}
|
|
|
|
if ((ahc->flags & AHC_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_LUN, SCB_XFERLEN_ODD jz target_ITloop;
|
|
test SCSIRATE, 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;
|
|
}
|
|
|
|
if ((ahc->flags & AHC_INITIATORROLE) != 0) {
|
|
/*
|
|
* Command phase. Set up the DMA registers and let 'er rip.
|
|
*/
|
|
p_command:
|
|
test SEQ_FLAGS, NOT_IDENTIFIED jz p_command_okay;
|
|
mvi PROTO_VIOLATION call set_seqint;
|
|
p_command_okay:
|
|
|
|
if ((ahc->features & AHC_ULTRA2) != 0) {
|
|
bmov HCNT[0], SCB_CDB_LEN, 1;
|
|
bmov HCNT[1], ALLZEROS, 2;
|
|
mvi SG_CACHE_PRE, LAST_SEG;
|
|
} else if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
bmov STCNT[0], SCB_CDB_LEN, 1;
|
|
bmov STCNT[1], ALLZEROS, 2;
|
|
} else {
|
|
mov STCNT[0], SCB_CDB_LEN;
|
|
clr STCNT[1];
|
|
clr STCNT[2];
|
|
}
|
|
add NONE, -13, SCB_CDB_LEN;
|
|
mvi SCB_CDB_STORE jnc p_command_embedded;
|
|
p_command_from_host:
|
|
if ((ahc->features & AHC_ULTRA2) != 0) {
|
|
bmov HADDR[0], SCB_CDB_PTR, 4;
|
|
mvi DFCNTRL, (PRELOADEN|SCSIEN|HDMAEN|DIRECTION);
|
|
} else {
|
|
if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
bmov HADDR[0], SCB_CDB_PTR, 4;
|
|
bmov HCNT, STCNT, 3;
|
|
} else {
|
|
mvi DINDEX, HADDR;
|
|
mvi SCB_CDB_PTR call bcopy_4;
|
|
mov SCB_CDB_LEN call set_hcnt;
|
|
}
|
|
mvi DFCNTRL, (SCSIEN|SDMAEN|HDMAEN|DIRECTION|FIFORESET);
|
|
}
|
|
jmp p_command_xfer;
|
|
p_command_embedded:
|
|
/*
|
|
* The data fifo seems to require 4 byte aligned
|
|
* transfers from the sequencer. Force this to
|
|
* be the case by clearing HADDR[0] even though
|
|
* we aren't going to touch host memory.
|
|
*/
|
|
clr HADDR[0];
|
|
if ((ahc->features & AHC_ULTRA2) != 0) {
|
|
mvi DFCNTRL, (PRELOADEN|SCSIEN|DIRECTION);
|
|
bmov DFDAT, SCB_CDB_STORE, 12;
|
|
} else if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
if ((ahc->flags & AHC_SCB_BTT) != 0) {
|
|
/*
|
|
* On the 7895 the data FIFO will
|
|
* get corrupted if you try to dump
|
|
* data from external SCB memory into
|
|
* the FIFO while it is enabled. So,
|
|
* fill the fifo and then enable SCSI
|
|
* transfers.
|
|
*/
|
|
mvi DFCNTRL, (DIRECTION|FIFORESET);
|
|
} else {
|
|
mvi DFCNTRL, (SCSIEN|SDMAEN|DIRECTION|FIFORESET);
|
|
}
|
|
bmov DFDAT, SCB_CDB_STORE, 12;
|
|
if ((ahc->flags & AHC_SCB_BTT) != 0) {
|
|
mvi DFCNTRL, (SCSIEN|SDMAEN|DIRECTION|FIFOFLUSH);
|
|
} else {
|
|
or DFCNTRL, FIFOFLUSH;
|
|
}
|
|
} else {
|
|
mvi DFCNTRL, (SCSIEN|SDMAEN|DIRECTION|FIFORESET);
|
|
call copy_to_fifo_6;
|
|
call copy_to_fifo_6;
|
|
or DFCNTRL, FIFOFLUSH;
|
|
}
|
|
p_command_xfer:
|
|
and SEQ_FLAGS, ~NO_CDB_SENT;
|
|
if ((ahc->features & AHC_DT) == 0) {
|
|
test SSTAT0, SDONE jnz . + 2;
|
|
test SSTAT1, PHASEMIS jz . - 1;
|
|
/*
|
|
* Wait for our ACK to go-away on its own
|
|
* instead of being killed by SCSIEN getting cleared.
|
|
*/
|
|
test SCSISIGI, ACKI jnz .;
|
|
} else {
|
|
test DFCNTRL, SCSIEN jnz .;
|
|
}
|
|
test SSTAT0, SDONE jnz p_command_successful;
|
|
/*
|
|
* Don't allow a data phase if the command
|
|
* was not fully transferred.
|
|
*/
|
|
or SEQ_FLAGS, NO_CDB_SENT;
|
|
p_command_successful:
|
|
and DFCNTRL, ~(SCSIEN|SDMAEN|HDMAEN);
|
|
test DFCNTRL, (SCSIEN|SDMAEN|HDMAEN) jnz .;
|
|
jmp ITloop;
|
|
|
|
/*
|
|
* Status phase. Wait for the data byte to appear, then read it
|
|
* and store it into the SCB.
|
|
*/
|
|
p_status:
|
|
test SEQ_FLAGS, NOT_IDENTIFIED jnz mesgin_proto_violation;
|
|
p_status_okay:
|
|
mov SCB_SCSI_STATUS, SCSIDATL;
|
|
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 response 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 */
|
|
if ((ahc->features & AHC_DT) == 0) {
|
|
or SCSISIGO, ATNO, LASTPHASE;
|
|
} else {
|
|
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, SAVED_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_TAG (the position in the kernel's SCB array) as the tag value.
|
|
*/
|
|
p_mesgout_tag:
|
|
test SCB_CONTROL,TAG_ENB jz p_mesgout_onebyte;
|
|
mov SCSIDATL, SINDEX; /* Send the identify message */
|
|
call phase_lock;
|
|
cmp LASTPHASE, P_MESGOUT jne p_mesgout_done;
|
|
and SCSIDATL,TAG_ENB|SCB_TAG_TYPE,SCB_CONTROL;
|
|
call phase_lock;
|
|
cmp LASTPHASE, P_MESGOUT jne p_mesgout_done;
|
|
mov SCB_TAG 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 SCSIDATL, 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:
|
|
mvi ACCUM call inb_first; /* read the 1st message byte */
|
|
|
|
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:
|
|
mvi HOST_MSG_LOOP call set_seqint;
|
|
call phase_lock;
|
|
cmp RETURN_1, EXIT_MSG_LOOP je ITloop + 1;
|
|
jmp host_message_loop;
|
|
|
|
mesgin_ign_wide_residue:
|
|
if ((ahc->features & AHC_WIDE) != 0) {
|
|
test SCSIRATE, WIDEXFER jz mesgin_reject;
|
|
/* Pull the residue byte */
|
|
mvi ARG_1 call inb_next;
|
|
cmp ARG_1, 0x01 jne mesgin_reject;
|
|
test SCB_RESIDUAL_SGPTR[0], SG_LIST_NULL jz . + 2;
|
|
test SCB_LUN, SCB_XFERLEN_ODD jnz mesgin_done;
|
|
mvi IGN_WIDE_RES call set_seqint;
|
|
jmp mesgin_done;
|
|
}
|
|
|
|
mesgin_proto_violation:
|
|
mvi PROTO_VIOLATION call set_seqint;
|
|
jmp mesgin_done;
|
|
mesgin_reject:
|
|
mvi MSG_MESSAGE_REJECT call mk_mesg;
|
|
mesgin_done:
|
|
mov NONE,SCSIDATL; /*dummy read from latch to ACK*/
|
|
jmp ITloop;
|
|
|
|
/*
|
|
* We received a "command complete" message. Put the SCB_TAG into the QOUTFIFO,
|
|
* and trigger a completion interrupt. 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 ignored us.
|
|
*/
|
|
test SCB_CONTROL, MK_MESSAGE jz . + 2;
|
|
mvi MKMSG_FAILED call set_seqint;
|
|
|
|
/*
|
|
* Check for residuals
|
|
*/
|
|
test SCB_SGPTR, SG_LIST_NULL jnz check_status;/* No xfer */
|
|
test SCB_SGPTR, SG_FULL_RESID jnz upload_scb;/* Never xfered */
|
|
test SCB_RESIDUAL_SGPTR, SG_LIST_NULL jz upload_scb;
|
|
check_status:
|
|
test SCB_SCSI_STATUS,0xff jz complete; /* Good Status? */
|
|
upload_scb:
|
|
or SCB_SGPTR, SG_RESID_VALID;
|
|
mvi DMAPARAMS, FIFORESET;
|
|
mov SCB_TAG call dma_scb;
|
|
test SCB_SCSI_STATUS, 0xff jz complete; /* Just a residual? */
|
|
mvi BAD_STATUS call set_seqint; /* let driver know */
|
|
cmp RETURN_1, SEND_SENSE jne complete;
|
|
call add_scb_to_free_list;
|
|
jmp await_busfree;
|
|
complete:
|
|
mov SCB_TAG call complete_post;
|
|
jmp await_busfree;
|
|
}
|
|
|
|
complete_post:
|
|
/* Post the SCBID in SINDEX and issue an interrupt */
|
|
call add_scb_to_free_list;
|
|
mov ARG_1, SINDEX;
|
|
if ((ahc->features & AHC_QUEUE_REGS) != 0) {
|
|
mov A, SDSCB_QOFF;
|
|
} else {
|
|
mov A, QOUTPOS;
|
|
}
|
|
mvi QOUTFIFO_OFFSET call post_byte_setup;
|
|
mov ARG_1 call post_byte;
|
|
if ((ahc->features & AHC_QUEUE_REGS) == 0) {
|
|
inc QOUTPOS;
|
|
}
|
|
mvi INTSTAT,CMDCMPLT ret;
|
|
|
|
if ((ahc->flags & AHC_INITIATORROLE) != 0) {
|
|
/*
|
|
* 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;
|
|
if ((ahc->flags & AHC_PAGESCBS) != 0) {
|
|
call add_scb_to_disc_list;
|
|
}
|
|
test SCB_CONTROL, TAG_ENB jnz await_busfree;
|
|
mov ARG_1, SCB_TAG;
|
|
and SAVED_LUN, LID, SCB_LUN;
|
|
mov SCB_SCSIID call set_busy_target;
|
|
jmp await_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. For chips without S/G pipelining,
|
|
* we can only ack the message after SHADDR has been saved. On these
|
|
* chips, SHADDR increments with every bus transaction, even PIO.
|
|
*/
|
|
mesgin_sdptrs:
|
|
if ((ahc->features & AHC_ULTRA2) != 0) {
|
|
mov NONE,SCSIDATL; /*dummy read from latch to ACK*/
|
|
test SEQ_FLAGS, DPHASE jz ITloop;
|
|
} else {
|
|
test SEQ_FLAGS, DPHASE jz mesgin_done;
|
|
}
|
|
|
|
/*
|
|
* 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 mesgin_sdptrs_full;
|
|
or SCB_SGPTR, SG_LIST_NULL;
|
|
if ((ahc->features & AHC_ULTRA2) != 0) {
|
|
jmp ITloop;
|
|
} else {
|
|
jmp mesgin_done;
|
|
}
|
|
|
|
mesgin_sdptrs_full:
|
|
|
|
/*
|
|
* The SCB_SGPTR becomes the next one we'll download,
|
|
* and the SCB_DATAPTR becomes the current SHADDR.
|
|
* Use the residual number since STCNT is corrupted by
|
|
* any message transfer.
|
|
*/
|
|
if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
bmov SCB_DATAPTR, SHADDR, 4;
|
|
if ((ahc->features & AHC_ULTRA2) == 0) {
|
|
mov NONE,SCSIDATL; /*dummy read from latch to ACK*/
|
|
}
|
|
bmov SCB_DATACNT, SCB_RESIDUAL_DATACNT, 8;
|
|
} else {
|
|
mvi DINDEX, SCB_DATAPTR;
|
|
mvi SHADDR call bcopy_4;
|
|
mov NONE,SCSIDATL; /*dummy read from latch to ACK*/
|
|
mvi SCB_RESIDUAL_DATACNT call bcopy_8;
|
|
}
|
|
jmp ITloop;
|
|
|
|
/*
|
|
* 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; /*
|
|
* We'll reload them
|
|
* the next time through
|
|
* the dataphase.
|
|
*/
|
|
or SXFRCTL0, CLRSTCNT|CLRCHN;
|
|
jmp mesgin_done;
|
|
|
|
/*
|
|
* Index into our Busy Target table. SINDEX and DINDEX are modified
|
|
* upon return. SCBPTR may be modified by this action.
|
|
*/
|
|
set_busy_target:
|
|
shr DINDEX, 4, SINDEX;
|
|
if ((ahc->flags & AHC_SCB_BTT) != 0) {
|
|
mov SCBPTR, SAVED_LUN;
|
|
add DINDEX, SCB_64_BTT;
|
|
} else {
|
|
add DINDEX, BUSY_TARGETS;
|
|
}
|
|
mov DINDIR, ARG_1 ret;
|
|
|
|
/*
|
|
* Identify message? For a reconnecting target, this tells us the lun
|
|
* that the reconnection is for - find the correct SCB and switch to it,
|
|
* clearing the "disconnected" bit so we don't "find" it by accident later.
|
|
*/
|
|
mesgin_identify:
|
|
/*
|
|
* Determine whether a target is using tagged or non-tagged
|
|
* transactions by first looking at the transaction stored in
|
|
* the busy target array. If there is no untagged transaction
|
|
* for this target or the transaction is for a different lun, then
|
|
* this must be a tagged transaction.
|
|
*/
|
|
shr SINDEX, 4, SAVED_SCSIID;
|
|
and SAVED_LUN, MSG_IDENTIFY_LUNMASK, A;
|
|
if ((ahc->flags & AHC_SCB_BTT) != 0) {
|
|
add SINDEX, SCB_64_BTT;
|
|
mov SCBPTR, SAVED_LUN;
|
|
if ((ahc->flags & AHC_SEQUENCER_DEBUG) != 0) {
|
|
add NONE, -SCB_64_BTT, SINDEX;
|
|
jc . + 2;
|
|
mvi INTSTAT, OUT_OF_RANGE;
|
|
nop;
|
|
add NONE, -(SCB_64_BTT + 16), SINDEX;
|
|
jnc . + 2;
|
|
mvi INTSTAT, OUT_OF_RANGE;
|
|
nop;
|
|
}
|
|
} else {
|
|
add SINDEX, BUSY_TARGETS;
|
|
if ((ahc->flags & AHC_SEQUENCER_DEBUG) != 0) {
|
|
add NONE, -BUSY_TARGETS, SINDEX;
|
|
jc . + 2;
|
|
mvi INTSTAT, OUT_OF_RANGE;
|
|
nop;
|
|
add NONE, -(BUSY_TARGETS + 16), SINDEX;
|
|
jnc . + 2;
|
|
mvi INTSTAT, OUT_OF_RANGE;
|
|
nop;
|
|
}
|
|
}
|
|
mov ARG_1, SINDIR;
|
|
cmp ARG_1, SCB_LIST_NULL je snoop_tag;
|
|
if ((ahc->flags & AHC_PAGESCBS) != 0) {
|
|
mov ARG_1 call findSCB;
|
|
} else {
|
|
mov SCBPTR, ARG_1;
|
|
}
|
|
if ((ahc->flags & AHC_SCB_BTT) != 0) {
|
|
jmp setup_SCB_id_lun_okay;
|
|
} else {
|
|
/*
|
|
* We only allow one untagged command per-target
|
|
* at a time. So, if the lun doesn't match, look
|
|
* for a tag message.
|
|
*/
|
|
and A, LID, SCB_LUN;
|
|
cmp SAVED_LUN, A je setup_SCB_id_lun_okay;
|
|
if ((ahc->flags & AHC_PAGESCBS) != 0) {
|
|
/*
|
|
* findSCB removes the SCB from the
|
|
* disconnected list, so we must replace
|
|
* it there should this SCB be for another
|
|
* lun.
|
|
*/
|
|
call cleanup_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. With SCB paging, we must search for non-tagged
|
|
* transactions since the SCB may exist in any slot. If we're not
|
|
* using SCB paging, we can use the tag as the direct index to the
|
|
* SCB.
|
|
*/
|
|
snoop_tag:
|
|
if ((ahc->flags & AHC_SEQUENCER_DEBUG) != 0) {
|
|
or SEQ_FLAGS, 0x80;
|
|
}
|
|
mov NONE,SCSIDATL; /* ACK Identify MSG */
|
|
call phase_lock;
|
|
if ((ahc->flags & AHC_SEQUENCER_DEBUG) != 0) {
|
|
or SEQ_FLAGS, 0x1;
|
|
}
|
|
cmp LASTPHASE, P_MESGIN jne not_found;
|
|
if ((ahc->flags & AHC_SEQUENCER_DEBUG) != 0) {
|
|
or SEQ_FLAGS, 0x2;
|
|
}
|
|
cmp SCSIBUSL,MSG_SIMPLE_Q_TAG jne not_found;
|
|
get_tag:
|
|
if ((ahc->flags & AHC_PAGESCBS) != 0) {
|
|
mvi ARG_1 call inb_next; /* tag value */
|
|
mov ARG_1 call findSCB;
|
|
} else {
|
|
mvi ARG_1 call inb_next; /* tag value */
|
|
mov SCBPTR, ARG_1;
|
|
}
|
|
|
|
/*
|
|
* Ensure that the SCB the tag points to is for
|
|
* an SCB transaction to the reconnecting target.
|
|
*/
|
|
setup_SCB:
|
|
if ((ahc->flags & AHC_SEQUENCER_DEBUG) != 0) {
|
|
or SEQ_FLAGS, 0x4;
|
|
}
|
|
mov A, SCB_SCSIID;
|
|
cmp SAVED_SCSIID, A jne not_found_cleanup_scb;
|
|
if ((ahc->flags & AHC_SEQUENCER_DEBUG) != 0) {
|
|
or SEQ_FLAGS, 0x8;
|
|
}
|
|
setup_SCB_id_okay:
|
|
and A, LID, SCB_LUN;
|
|
cmp SAVED_LUN, A jne not_found_cleanup_scb;
|
|
setup_SCB_id_lun_okay:
|
|
if ((ahc->flags & AHC_SEQUENCER_DEBUG) != 0) {
|
|
or SEQ_FLAGS, 0x10;
|
|
}
|
|
test SCB_CONTROL,DISCONNECTED jz not_found_cleanup_scb;
|
|
and SCB_CONTROL,~DISCONNECTED;
|
|
test SCB_CONTROL, TAG_ENB jnz setup_SCB_tagged;
|
|
if ((ahc->flags & AHC_SCB_BTT) != 0) {
|
|
mov A, SCBPTR;
|
|
}
|
|
mvi ARG_1, SCB_LIST_NULL;
|
|
mov SAVED_SCSIID call set_busy_target;
|
|
if ((ahc->flags & AHC_SCB_BTT) != 0) {
|
|
mov SCBPTR, A;
|
|
}
|
|
setup_SCB_tagged:
|
|
clr SEQ_FLAGS; /* make note of IDENTIFY */
|
|
call set_transfer_settings;
|
|
/* 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_cleanup_scb:
|
|
if ((ahc->flags & AHC_PAGESCBS) != 0) {
|
|
call cleanup_scb;
|
|
}
|
|
not_found:
|
|
mvi NO_MATCH call set_seqint;
|
|
jmp mesgin_done;
|
|
|
|
mk_mesg:
|
|
if ((ahc->features & AHC_DT) == 0) {
|
|
or SCSISIGO, ATNO, LASTPHASE;
|
|
} else {
|
|
mvi SCSISIGO, ATNO;
|
|
}
|
|
mov MSG_OUT,SINDEX ret;
|
|
|
|
/*
|
|
* Functions to read data in Automatic PIO mode.
|
|
*
|
|
* According to Adaptec's documentation, 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_wait_perr:
|
|
mvi PERR_DETECTED call set_seqint;
|
|
jmp inb_next_wait;
|
|
inb_next:
|
|
mov NONE,SCSIDATL; /*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 SSTAT1, REQINIT jz inb_next_wait;
|
|
test SSTAT1, SCSIPERR jnz inb_next_wait_perr;
|
|
inb_next_check_phase:
|
|
and LASTPHASE, PHASE_MASK, SCSISIGI;
|
|
cmp LASTPHASE, P_MESGIN jne mesgin_phasemis;
|
|
inb_first:
|
|
mov DINDEX,SINDEX;
|
|
mov DINDIR,SCSIBUSL ret; /*read byte directly from bus*/
|
|
inb_last:
|
|
mov NONE,SCSIDATL ret; /*dummy read from latch to ACK*/
|
|
}
|
|
|
|
if ((ahc->flags & AHC_TARGETROLE) != 0) {
|
|
/*
|
|
* Change to a new phase. If we are changing the state of the I/O signal,
|
|
* from out to in, wait an additional data release delay before continuing.
|
|
*/
|
|
change_phase:
|
|
/* Wait for preceding I/O session to complete. */
|
|
test SCSISIGI, ACKI jnz .;
|
|
|
|
/* Change the phase */
|
|
and DINDEX, IOI, SCSISIGI;
|
|
mov SCSISIGO, SINDEX;
|
|
and A, IOI, SINDEX;
|
|
|
|
/*
|
|
* If the data direction has changed, from
|
|
* out (initiator driving) to in (target driving),
|
|
* we must wait at least a data release delay plus
|
|
* the normal bus settle delay. [SCSI III SPI 10.11.0]
|
|
*/
|
|
cmp DINDEX, A je change_phase_wait;
|
|
test SINDEX, IOI jz change_phase_wait;
|
|
call change_phase_wait;
|
|
change_phase_wait:
|
|
nop;
|
|
nop;
|
|
nop;
|
|
nop ret;
|
|
|
|
/*
|
|
* Send a byte to an initiator in Automatic PIO mode.
|
|
*/
|
|
target_outb:
|
|
or SXFRCTL0, SPIOEN;
|
|
test SSTAT0, SPIORDY jz .;
|
|
mov SCSIDATL, SINDEX;
|
|
test SSTAT0, SPIORDY jz .;
|
|
and SXFRCTL0, ~SPIOEN ret;
|
|
}
|
|
|
|
/*
|
|
* Locate a disconnected SCB by SCBID. Upon return, SCBPTR and SINDEX will
|
|
* be set to the position of the SCB. If the SCB cannot be found locally,
|
|
* it will be paged in from host memory. RETURN_2 stores the address of the
|
|
* preceding SCB in the disconnected list which can be used to speed up
|
|
* removal of the found SCB from the disconnected list.
|
|
*/
|
|
if ((ahc->flags & AHC_PAGESCBS) != 0) {
|
|
BEGIN_CRITICAL;
|
|
findSCB:
|
|
mov A, SINDEX; /* Tag passed in SINDEX */
|
|
cmp DISCONNECTED_SCBH, SCB_LIST_NULL je findSCB_notFound;
|
|
mov SCBPTR, DISCONNECTED_SCBH; /* Initialize SCBPTR */
|
|
mvi ARG_2, SCB_LIST_NULL; /* Head of list */
|
|
jmp findSCB_loop;
|
|
findSCB_next:
|
|
cmp SCB_NEXT, SCB_LIST_NULL je findSCB_notFound;
|
|
mov ARG_2, SCBPTR;
|
|
mov SCBPTR,SCB_NEXT;
|
|
findSCB_loop:
|
|
cmp SCB_TAG, A jne findSCB_next;
|
|
rem_scb_from_disc_list:
|
|
cmp ARG_2, SCB_LIST_NULL je rHead;
|
|
mov DINDEX, SCB_NEXT;
|
|
mov SINDEX, SCBPTR;
|
|
mov SCBPTR, ARG_2;
|
|
mov SCB_NEXT, DINDEX;
|
|
mov SCBPTR, SINDEX ret;
|
|
rHead:
|
|
mov DISCONNECTED_SCBH,SCB_NEXT ret;
|
|
END_CRITICAL;
|
|
findSCB_notFound:
|
|
/*
|
|
* We didn't find it. Page in the SCB.
|
|
*/
|
|
mov ARG_1, A; /* Save tag */
|
|
mov ALLZEROS call get_free_or_disc_scb;
|
|
mvi DMAPARAMS, HDMAEN|DIRECTION|FIFORESET;
|
|
mov ARG_1 jmp dma_scb;
|
|
}
|
|
|
|
/*
|
|
* Prepare the hardware to post a byte to host memory given an
|
|
* index of (A + (256 * SINDEX)) and a base address of SHARED_DATA_ADDR.
|
|
*/
|
|
post_byte_setup:
|
|
mov ARG_2, SINDEX;
|
|
if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
mvi DINDEX, CCHADDR;
|
|
mvi SHARED_DATA_ADDR call set_1byte_addr;
|
|
mvi CCHCNT, 1;
|
|
mvi CCSCBCTL, CCSCBRESET ret;
|
|
} else {
|
|
mvi DINDEX, HADDR;
|
|
mvi SHARED_DATA_ADDR call set_1byte_addr;
|
|
mvi 1 call set_hcnt;
|
|
mvi DFCNTRL, FIFORESET ret;
|
|
}
|
|
|
|
post_byte:
|
|
if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
bmov CCSCBRAM, SINDEX, 1;
|
|
or CCSCBCTL, CCSCBEN|CCSCBRESET;
|
|
test CCSCBCTL, CCSCBDONE jz .;
|
|
clr CCSCBCTL ret;
|
|
} else {
|
|
mov DFDAT, SINDEX;
|
|
or DFCNTRL, HDMAEN|FIFOFLUSH;
|
|
jmp dma_finish;
|
|
}
|
|
|
|
phase_lock_perr:
|
|
mvi PERR_DETECTED call set_seqint;
|
|
phase_lock:
|
|
/*
|
|
* If there is a parity error, wait for the kernel to
|
|
* see the interrupt and prepare our message response
|
|
* before continuing.
|
|
*/
|
|
test SSTAT1, REQINIT jz phase_lock;
|
|
test SSTAT1, SCSIPERR jnz phase_lock_perr;
|
|
phase_lock_latch_phase:
|
|
if ((ahc->features & AHC_DT) == 0) {
|
|
and SCSISIGO, PHASE_MASK, SCSISIGI;
|
|
}
|
|
and LASTPHASE, PHASE_MASK, SCSISIGI ret;
|
|
|
|
if ((ahc->features & AHC_CMD_CHAN) == 0) {
|
|
set_hcnt:
|
|
mov HCNT[0], SINDEX;
|
|
clear_hcnt:
|
|
clr HCNT[1];
|
|
clr HCNT[2] ret;
|
|
|
|
set_stcnt_from_hcnt:
|
|
mov STCNT[0], HCNT[0];
|
|
mov STCNT[1], HCNT[1];
|
|
mov STCNT[2], HCNT[2] ret;
|
|
|
|
bcopy_8:
|
|
mov DINDIR, SINDIR;
|
|
bcopy_7:
|
|
mov DINDIR, SINDIR;
|
|
mov DINDIR, SINDIR;
|
|
bcopy_5:
|
|
mov DINDIR, SINDIR;
|
|
bcopy_4:
|
|
mov DINDIR, SINDIR;
|
|
bcopy_3:
|
|
mov DINDIR, SINDIR;
|
|
mov DINDIR, SINDIR;
|
|
mov DINDIR, SINDIR ret;
|
|
}
|
|
|
|
if ((ahc->flags & AHC_TARGETROLE) != 0) {
|
|
/*
|
|
* Setup addr assuming that A is an index into
|
|
* an array of 32byte objects, SINDEX contains
|
|
* the base address of that array, and DINDEX
|
|
* contains the base address of the location
|
|
* to store the indexed address.
|
|
*/
|
|
set_32byte_addr:
|
|
shr ARG_2, 3, A;
|
|
shl A, 5;
|
|
jmp set_1byte_addr;
|
|
}
|
|
|
|
/*
|
|
* Setup addr assuming that A is an index into
|
|
* an array of 64byte objects, SINDEX contains
|
|
* the base address of that array, and DINDEX
|
|
* contains the base address of the location
|
|
* to store the indexed address.
|
|
*/
|
|
set_64byte_addr:
|
|
shr ARG_2, 2, A;
|
|
shl A, 6;
|
|
|
|
/*
|
|
* Setup addr assuming that A + (ARG_2 * 256) is an
|
|
* index into an array of 1byte objects, SINDEX contains
|
|
* the base address of that array, and DINDEX contains
|
|
* the base address of the location to store the computed
|
|
* address.
|
|
*/
|
|
set_1byte_addr:
|
|
add DINDIR, A, SINDIR;
|
|
mov A, ARG_2;
|
|
adc DINDIR, A, SINDIR;
|
|
clr A;
|
|
adc DINDIR, A, SINDIR;
|
|
adc DINDIR, A, SINDIR ret;
|
|
|
|
/*
|
|
* Either post or fetch an SCB from host memory based on the
|
|
* DIRECTION bit in DMAPARAMS. The host SCB index is in SINDEX.
|
|
*/
|
|
dma_scb:
|
|
mov A, SINDEX;
|
|
if ((ahc->features & AHC_CMD_CHAN) != 0) {
|
|
mvi DINDEX, CCHADDR;
|
|
mvi HSCB_ADDR call set_64byte_addr;
|
|
mov CCSCBPTR, SCBPTR;
|
|
test DMAPARAMS, DIRECTION jz dma_scb_tohost;
|
|
if ((ahc->flags & AHC_SCB_BTT) != 0) {
|
|
mvi CCHCNT, SCB_DOWNLOAD_SIZE_64;
|
|
} else {
|
|
mvi CCHCNT, SCB_DOWNLOAD_SIZE;
|
|
}
|
|
mvi CCSCBCTL, CCARREN|CCSCBEN|CCSCBDIR|CCSCBRESET;
|
|
cmp CCSCBCTL, CCSCBDONE|ARRDONE|CCARREN|CCSCBEN|CCSCBDIR jne .;
|
|
jmp dma_scb_finish;
|
|
dma_scb_tohost:
|
|
mvi CCHCNT, SCB_UPLOAD_SIZE;
|
|
if ((ahc->features & AHC_ULTRA2) == 0) {
|
|
mvi CCSCBCTL, CCSCBRESET;
|
|
bmov CCSCBRAM, SCB_BASE, SCB_UPLOAD_SIZE;
|
|
or CCSCBCTL, CCSCBEN|CCSCBRESET;
|
|
test CCSCBCTL, CCSCBDONE jz .;
|
|
} else if ((ahc->bugs & AHC_SCBCHAN_UPLOAD_BUG) != 0) {
|
|
mvi CCSCBCTL, CCARREN|CCSCBRESET;
|
|
cmp CCSCBCTL, ARRDONE|CCARREN jne .;
|
|
mvi CCHCNT, SCB_UPLOAD_SIZE;
|
|
mvi CCSCBCTL, CCSCBEN|CCSCBRESET;
|
|
cmp CCSCBCTL, CCSCBDONE|CCSCBEN jne .;
|
|
} else {
|
|
mvi CCSCBCTL, CCARREN|CCSCBEN|CCSCBRESET;
|
|
cmp CCSCBCTL, CCSCBDONE|ARRDONE|CCARREN|CCSCBEN jne .;
|
|
}
|
|
dma_scb_finish:
|
|
clr CCSCBCTL;
|
|
test CCSCBCTL, CCARREN|CCSCBEN jnz .;
|
|
ret;
|
|
} else {
|
|
mvi DINDEX, HADDR;
|
|
mvi HSCB_ADDR call set_64byte_addr;
|
|
mvi SCB_DOWNLOAD_SIZE call set_hcnt;
|
|
mov DFCNTRL, DMAPARAMS;
|
|
test DMAPARAMS, DIRECTION jnz dma_scb_fromhost;
|
|
/* Fill it with the SCB data */
|
|
copy_scb_tofifo:
|
|
mvi SINDEX, SCB_BASE;
|
|
add A, SCB_DOWNLOAD_SIZE, SINDEX;
|
|
copy_scb_tofifo_loop:
|
|
call copy_to_fifo_8;
|
|
cmp SINDEX, A jne copy_scb_tofifo_loop;
|
|
or DFCNTRL, HDMAEN|FIFOFLUSH;
|
|
jmp dma_finish;
|
|
dma_scb_fromhost:
|
|
mvi DINDEX, SCB_BASE;
|
|
if ((ahc->bugs & AHC_PCI_2_1_RETRY_BUG) != 0) {
|
|
/*
|
|
* The PCI module will only issue a PCI
|
|
* retry if the data FIFO is empty. If the
|
|
* host disconnects in the middle of a
|
|
* transfer, we must empty the fifo of all
|
|
* available data to force the chip to
|
|
* continue the transfer. This does not
|
|
* happen for SCSI transfers as the SCSI module
|
|
* will drain the FIFO as data are made available.
|
|
* When the hang occurs, we know that a multiple
|
|
* of 8 bytes is in the FIFO because the PCI
|
|
* module has an 8 byte input latch that only
|
|
* dumps to the FIFO when HCNT == 0 or the
|
|
* latch is full.
|
|
*/
|
|
clr A;
|
|
/* Wait for at least 8 bytes of data to arrive. */
|
|
dma_scb_hang_fifo:
|
|
test DFSTATUS, FIFOQWDEMP jnz dma_scb_hang_fifo;
|
|
dma_scb_hang_wait:
|
|
test DFSTATUS, MREQPEND jnz dma_scb_hang_wait;
|
|
test DFSTATUS, HDONE jnz dma_scb_hang_dma_done;
|
|
test DFSTATUS, HDONE jnz dma_scb_hang_dma_done;
|
|
test DFSTATUS, HDONE jnz dma_scb_hang_dma_done;
|
|
/*
|
|
* The PCI module no longer intends to perform
|
|
* a PCI transaction. Drain the fifo.
|
|
*/
|
|
dma_scb_hang_dma_drain_fifo:
|
|
not A, HCNT;
|
|
add A, SCB_DOWNLOAD_SIZE+SCB_BASE+1;
|
|
and A, ~0x7;
|
|
mov DINDIR,DFDAT;
|
|
cmp DINDEX, A jne . - 1;
|
|
cmp DINDEX, SCB_DOWNLOAD_SIZE+SCB_BASE
|
|
je dma_finish_nowait;
|
|
/* Restore A as the lines left to transfer. */
|
|
add A, -SCB_BASE, DINDEX;
|
|
shr A, 3;
|
|
jmp dma_scb_hang_fifo;
|
|
dma_scb_hang_dma_done:
|
|
and DFCNTRL, ~HDMAEN;
|
|
test DFCNTRL, HDMAEN jnz .;
|
|
add SEQADDR0, A;
|
|
} else {
|
|
call dma_finish;
|
|
}
|
|
call dfdat_in_8;
|
|
call dfdat_in_8;
|
|
call dfdat_in_8;
|
|
dfdat_in_8:
|
|
mov DINDIR,DFDAT;
|
|
dfdat_in_7:
|
|
mov DINDIR,DFDAT;
|
|
mov DINDIR,DFDAT;
|
|
mov DINDIR,DFDAT;
|
|
mov DINDIR,DFDAT;
|
|
mov DINDIR,DFDAT;
|
|
dfdat_in_2:
|
|
mov DINDIR,DFDAT;
|
|
mov DINDIR,DFDAT ret;
|
|
}
|
|
|
|
copy_to_fifo_8:
|
|
mov DFDAT,SINDIR;
|
|
mov DFDAT,SINDIR;
|
|
copy_to_fifo_6:
|
|
mov DFDAT,SINDIR;
|
|
copy_to_fifo_5:
|
|
mov DFDAT,SINDIR;
|
|
copy_to_fifo_4:
|
|
mov DFDAT,SINDIR;
|
|
mov DFDAT,SINDIR;
|
|
mov DFDAT,SINDIR;
|
|
mov DFDAT,SINDIR ret;
|
|
|
|
/*
|
|
* Wait for DMA from host memory to data FIFO to complete, then disable
|
|
* DMA and wait for it to acknowledge that it's off.
|
|
*/
|
|
dma_finish:
|
|
test DFSTATUS,HDONE jz dma_finish;
|
|
dma_finish_nowait:
|
|
/* Turn off DMA */
|
|
and DFCNTRL, ~HDMAEN;
|
|
test DFCNTRL, HDMAEN jnz .;
|
|
ret;
|
|
|
|
/*
|
|
* Restore an SCB that failed to match an incoming reselection
|
|
* to the correct/safe state. If the SCB is for a disconnected
|
|
* transaction, it must be returned to the disconnected list.
|
|
* If it is not in the disconnected state, it must be free.
|
|
*/
|
|
cleanup_scb:
|
|
if ((ahc->flags & AHC_PAGESCBS) != 0) {
|
|
test SCB_CONTROL,DISCONNECTED jnz add_scb_to_disc_list;
|
|
}
|
|
add_scb_to_free_list:
|
|
if ((ahc->flags & AHC_PAGESCBS) != 0) {
|
|
BEGIN_CRITICAL;
|
|
mov SCB_NEXT, FREE_SCBH;
|
|
mvi SCB_TAG, SCB_LIST_NULL;
|
|
mov FREE_SCBH, SCBPTR ret;
|
|
END_CRITICAL;
|
|
} else {
|
|
mvi SCB_TAG, SCB_LIST_NULL ret;
|
|
}
|
|
|
|
if ((ahc->flags & AHC_39BIT_ADDRESSING) != 0) {
|
|
set_hhaddr:
|
|
or DSCOMMAND1, HADDLDSEL0;
|
|
and HADDR, SG_HIGH_ADDR_BITS, SINDEX;
|
|
and DSCOMMAND1, ~HADDLDSEL0 ret;
|
|
}
|
|
|
|
if ((ahc->flags & AHC_PAGESCBS) != 0) {
|
|
get_free_or_disc_scb:
|
|
BEGIN_CRITICAL;
|
|
cmp FREE_SCBH, SCB_LIST_NULL jne dequeue_free_scb;
|
|
cmp DISCONNECTED_SCBH, SCB_LIST_NULL jne dequeue_disc_scb;
|
|
return_error:
|
|
mvi NO_FREE_SCB call set_seqint;
|
|
mvi SINDEX, SCB_LIST_NULL ret;
|
|
dequeue_disc_scb:
|
|
mov SCBPTR, DISCONNECTED_SCBH;
|
|
mov DISCONNECTED_SCBH, SCB_NEXT;
|
|
END_CRITICAL;
|
|
mvi DMAPARAMS, FIFORESET;
|
|
mov SCB_TAG jmp dma_scb;
|
|
BEGIN_CRITICAL;
|
|
dequeue_free_scb:
|
|
mov SCBPTR, FREE_SCBH;
|
|
mov FREE_SCBH, SCB_NEXT ret;
|
|
END_CRITICAL;
|
|
|
|
add_scb_to_disc_list:
|
|
/*
|
|
* Link this SCB into the DISCONNECTED list. This list holds the
|
|
* candidates for paging out an SCB if one is needed for a new command.
|
|
* Modifying the disconnected list is a critical(pause dissabled) section.
|
|
*/
|
|
BEGIN_CRITICAL;
|
|
mov SCB_NEXT, DISCONNECTED_SCBH;
|
|
mov DISCONNECTED_SCBH, SCBPTR ret;
|
|
END_CRITICAL;
|
|
}
|
|
set_seqint:
|
|
mov INTSTAT, SINDEX;
|
|
nop;
|
|
return:
|
|
ret;
|