c83d2c637f
Add the same type of safeguards we use in the mesg_in phase to the mesg_out phase. aic7xxx_reg.h: Add definitions for the DSCommand register for PCI adapters.
1132 lines
33 KiB
Plaintext
1132 lines
33 KiB
Plaintext
/*+M***********************************************************************
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*Adaptec 274x/284x/294x device driver for Linux and FreeBSD.
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*
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*Copyright (c) 1994 John Aycock
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* The University of Calgary Department of Computer Science.
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* All rights reserved.
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*
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*Modifications/enhancements:
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* Copyright (c) 1994, 1995 Justin Gibbs. 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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*2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of Calgary
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* Department of Computer Science and its contributors.
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*4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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*THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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*ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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*IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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*ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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*FOR ANY DIRECT, INDIRECT, INCIDENTAL, 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, STRICT
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*LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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*OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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*SUCH DAMAGE.
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*
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*FreeBSD, Twin, Wide, 2 command per target support, tagged queuing and other
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*optimizations provided by Justin T. Gibbs (gibbs@FreeBSD.org)
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*
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*-M************************************************************************/
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VERSION AIC7XXX_SEQ_VER "$Id: aic7xxx.seq,v 1.26 1996/01/05 16:11:49 gibbs Exp $"
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#include "../../dev/aic7xxx/aic7xxx_reg.h"
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/*
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* We can't just use ACCUM in the sequencer code because it
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* must be treated specially by the assembler, and it currently
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* looks for the symbol 'A'. This is the only register defined
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* the assembler's symbol space.
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*/
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A = ACCUM
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/* After starting the selection hardware, we return to the "poll_for_work"
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* loop so that we can check for reconnecting targets as well as for our
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* selection to complete just in case the reselection wins bus arbitration.
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* The problem with this is that we must keep track of the SCB that we've
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* already pulled from the QINFIFO and started the selection on just in case
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* the reselection wins so that we can retry the selection at a later time.
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* This problem cannot be resolved by holding a single entry in scratch
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* ram since a reconnecting target can request sense and this will create
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* yet another SCB waiting for selection. The solution used here is to
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* use byte 31 of the SCB as a psuedo-next pointer and to thread a list
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* of SCBs that are awaiting selection. Since 0-0xfe are valid SCB offsets,
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* SCB_LIST_NULL is 0xff which is out of range. The kernel driver must
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* add an entry to this list everytime a request sense occurs. The sequencer
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* will automatically consume the entries.
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*/
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/*
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* Initialize any state idle loop state here. This code is executed on
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* startup and after every bus free.
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*/
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start:
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mvi SCSISEQ,ENRSELI /* Always allow reselection */
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poll_for_work:
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/*
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* Are we a twin channel device?
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* For fairness, we check the other bus first,
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* since we just finished a transaction on the
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* current channel.
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*/
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test FLAGS,TWIN_BUS jz start2
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xor SBLKCTL,SELBUSB /* Toggle to the other bus */
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test SSTAT0,SELDI jnz reselect
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xor SBLKCTL,SELBUSB /* Toggle to the original bus */
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start2:
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test SSTAT0,SELDI jnz reselect
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cmp WAITING_SCBH,SCB_LIST_NULL jne start_waiting
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test QINCNT,0xff jz poll_for_work
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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. Set the SCB
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* pointer from the FIFO so we see the right bank of SCB
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* registers.
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*/
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mov SCBPTR,QINFIFO
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/*
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* If the control byte of this SCB has the NEEDDMA flag set, we have
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* yet to DMA it from host memory
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*/
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test SCB_CONTROL,NEEDDMA jz test_busy
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clr HCNT2
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clr HCNT1
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mvi HCNT0,SCB_SIZEOF
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mvi DINDEX,HADDR
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mvi SCB_PHYSADDR call bcopy_4
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mvi DFCNTRL,0xd /* HDMAEN|DIRECTION|FIFORESET */
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/*
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* Wait for DMA from host memory to data FIFO to complete, then disable
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* DMA and wait for it to acknowledge that it's off.
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*/
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call dma_finish
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/* Copy the SCB from the FIFO to the SCBARRAY */
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mvi DINDEX, SCBARRAY
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call bcopy_5_dfdat
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call bcopy_7_dfdat
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call bcopy_7_dfdat
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call bcopy_7_dfdat
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/*
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* See if there is not already an active SCB for this target. This code
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* locks out on a per target basis instead of target/lun. Although this
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* is not ideal for devices that have multiple luns active at the same
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* time, it is faster than looping through all SCB's looking for active
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* commands. It may be benificial to make findscb a more general procedure
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* to see if the added cost of the search is negligible. This code also
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* assumes that the kernel driver will clear the active flags on board
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* initialization, board reset, and a target SELTO. Tagged commands
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* don't set the active bits since you can have more than queue more
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* than one command at a time. We do, however, look to see if there
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* are any non-tagged I/Os in progress, and requeue the command if
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* there are. Tagged and non-tagged commands cannot be mixed to a
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* single target.
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*/
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test_busy:
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mov FUNCTION1,SCB_TCL
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mov A,FUNCTION1
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test SCB_TCL,0x88 jz test_a /* Id < 8 && A channel */
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test ACTIVE_B,A jnz requeue
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test SCB_CONTROL,TAG_ENB jnz start_scb
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/* Mark the current target as busy */
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or ACTIVE_B,A
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jmp start_scb
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/* Place the currently active SCB back on the queue for later processing */
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requeue:
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mov QINFIFO, SCBPTR
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jmp poll_for_work
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/*
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* Pull the first entry off of the waiting for selection list
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* We don't have to "test_busy" because only transactions that
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* have passed that test can be in the waiting_scb list.
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*/
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start_waiting:
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mov SCBPTR,WAITING_SCBH
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jmp start_scb2
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test_a:
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test ACTIVE_A,A jnz requeue
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test SCB_CONTROL,TAG_ENB jnz start_scb
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/* Mark the current target as busy */
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or ACTIVE_A,A
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start_scb:
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mov SCB_NEXT_WAITING,WAITING_SCBH
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mov WAITING_SCBH, SCBPTR
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start_scb2:
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and SINDEX,0xf7,SBLKCTL /* Clear the channel select bit */
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and A,0x08,SCB_TCL /* Get new channel bit */
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or SINDEX,A
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mov SBLKCTL,SINDEX /* select channel */
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mov SCB_TCL call initialize_scsiid
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/*
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* Enable selection phase as an initiator, and do automatic ATN
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* after the selection. We do this now so that we can overlap the
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* rest of our work to set up this target with the arbitration and
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* selection bus phases.
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*/
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start_selection:
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mvi SCSISEQ,0x58 /* ENSELO|ENAUTOATNO|ENRSELI */
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/*
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* As soon as we get a successful selection, the target should go
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* into the message out phase since we have ATN asserted. Prepare
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* the message to send.
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*
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* Messages are stored in scratch RAM starting with a length byte
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* followed by the message itself.
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*/
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test SCB_CMDLEN,0xff jnz mk_identify /* 0 Length Command? */
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/*
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* The kernel has sent us an SCB with no command attached. This implies
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* that the kernel wants to send a message of some sort to this target,
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* so we interrupt the driver, allow it to fill the message buffer, and
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* then go back into the arbitration loop
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*/
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mvi INTSTAT,AWAITING_MSG
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jmp wait_for_selection
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mk_identify:
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and A,DISCENB,SCB_CONTROL /* mask off disconnect privledge */
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and SINDEX,0x7,SCB_TCL /* lun */
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or SINDEX,A /* or in disconnect privledge */
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or SINDEX,MSG_IDENTIFY call mk_mesg /* IDENTIFY message */
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test SCB_CONTROL,0xb0 jz !message /* WDTR, SDTR or TAG?? */
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/*
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* Tag Message if Tag enabled in SCB control block. Use SCBPTR as the tag
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* value
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*/
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mk_tag:
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mvi DINDEX, MSG1
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test SCB_CONTROL,TAG_ENB jz mk_tag_done
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and A,0x23,SCB_CONTROL
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mov DINDIR,A
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mov DINDIR,SCBPTR
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add MSG_LEN,COMP_MSG0,DINDEX /* update message length */
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mk_tag_done:
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mov DINDEX call mk_dtr /* build DTR message if needed */
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!message:
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wait_for_selection:
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test SSTAT0,SELDO jnz select
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test SSTAT0,SELDI jz wait_for_selection
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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
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* yet.
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*/
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reselect:
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clr MSG_LEN /* Don't have anything in the mesg buffer */
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mov SELID call initialize_scsiid
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mvi SAVED_TCL, 0xff /*
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* Fill with an imposible value so we
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* don't get false hits for a tag
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* without an identify.
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*/
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and FLAGS,0x03 /* clear target specific flags */
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or FLAGS,RESELECTED
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jmp select2
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/*
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* After the selection, remove this SCB from the "waiting for selection"
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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:
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and FLAGS,0x03 /* Clear target flags */
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or SCB_CONTROL,NEEDDMA
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/*
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* Some drives will issue a simple tag message during
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* a tagged selection if they are immediately ready
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* to handle the command without a disconnect. Ensure
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* that SAVED_TCL (used in get_tag) is inialized correctly
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* during a selection for this reason.
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*/
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mov SAVED_TCL, SCB_TCL
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mov WAITING_SCBH,SCB_NEXT_WAITING
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select2:
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/*
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* Set CLRCHN here before the target has entered a data transfer mode -
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* with synchronous SCSI, if you do it later, you blow away some
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* data in the SCSI FIFO that the target has already sent to you.
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*/
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clr SIGSTATE
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or SXFRCTL0,CLRCHN
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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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call ndx_dtr
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mov SCSIRATE,SINDIR
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mvi SCSISEQ,ENAUTOATNP /*
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* ATN on parity errors
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* for "in" phases
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*/
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mvi CLRSINT1,CLRBUSFREE
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mvi CLRSINT0,0x60 /* CLRSELDI|CLRSELDO */
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/*
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* Main loop for information transfer phases. If BSY is false, then
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* we have a bus free condition, expected or not. Otherwise, wait
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* for the target to assert REQ before checking MSG, C/D and I/O
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* for the bus phase.
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*
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*/
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ITloop:
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test SSTAT1,BUSFREE jnz p_busfree
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test SSTAT1,REQINIT jz ITloop
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and A,PHASE_MASK,SCSISIGI
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mov A call scsisig
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cmp ALLZEROS,A je p_dataout
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cmp A,P_DATAIN je p_datain
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cmp A,P_COMMAND je p_command
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cmp A,P_MESGOUT je p_mesgout
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cmp A,P_STATUS je p_status
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cmp A,P_MESGIN je p_mesgin
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mvi INTSTAT,BAD_PHASE /* unknown phase - signal driver */
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p_dataout:
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mvi DMAPARAMS,0x7d /*
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* WIDEODD|SCSIEN|SDMAEN|HDMAEN|
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* DIRECTION|FIFORESET
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*/
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jmp data_phase_init
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/*
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* If we re-enter the data phase after going through another phase, the
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* STCNT may have been cleared, so restore it from the residual field.
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*/
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data_phase_reinit:
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mvi DINDEX, STCNT
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mvi SCB_RESID_DCNT call bcopy_3
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jmp data_phase_loop
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p_datain:
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mvi DMAPARAMS,0x79 /*
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* WIDEODD|SCSIEN|SDMAEN|HDMAEN|
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* !DIRECTION|FIFORESET
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*/
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data_phase_init:
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call assert
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test FLAGS, DPHASE jnz data_phase_reinit
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call sg_scb2ram
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or FLAGS, DPHASE /* We have seen a data phase */
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data_phase_loop:
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/* If we are the last SG block, don't set wideodd. */
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cmp SG_COUNT,0x01 jne data_phase_wideodd
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and DMAPARAMS, 0xbf /* Turn off WIDEODD */
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data_phase_wideodd:
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mov DMAPARAMS call dma
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/* Exit if we had an underrun */
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test SSTAT0,SDONE jz data_phase_finish /* underrun STCNT != 0 */
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/*
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* Advance the scatter-gather pointers if needed
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*/
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sg_advance:
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dec SG_COUNT /* one less segment to go */
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test SG_COUNT, 0xff jz data_phase_finish /* Are we done? */
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clr A /* add sizeof(struct scatter) */
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add SG_NEXT0,SG_SIZEOF,SG_NEXT0
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adc SG_NEXT1,A,SG_NEXT1
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adc SG_NEXT2,A,SG_NEXT2
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adc SG_NEXT3,A,SG_NEXT3
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/*
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* Load a struct scatter and set up the data address and length.
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* If the working value of the SG count is nonzero, then
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* we need to load a new set of values.
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*
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* This, like all DMA's, assumes a little-endian host data storage.
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*/
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sg_load:
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clr HCNT2
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clr HCNT1
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mvi HCNT0,SG_SIZEOF
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mvi DINDEX,HADDR
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mvi SG_NEXT call bcopy_4
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mvi DFCNTRL,0xd /* HDMAEN|DIRECTION|FIFORESET */
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/*
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* Wait for DMA from host memory to data FIFO to complete, then disable
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* DMA and wait for it to acknowledge that it's off.
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*/
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call dma_finish
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/*
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* Copy data from FIFO into SCB data pointer and data count. This assumes
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* that the struct scatterlist has this structure (this and sizeof(struct
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* scatterlist) == 12 are asserted in aic7xxx.c):
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*
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* struct scatterlist {
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* char *address; four bytes, little-endian order
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* ... four bytes, ignored
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* unsigned short length; two bytes, little-endian order
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* }
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*
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*
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* Not in FreeBSD. the scatter list entry is only 8 bytes.
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*
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* struct ahc_dma_seg {
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* physaddr addr; four bytes, little-endian order
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* long len; four bytes, little endian order
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* };
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*/
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/*
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* For Linux, we must throw away four bytes since there is a 32bit gap
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* in the middle of a struct scatterlist
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*/
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#ifdef LINUX
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call bcopy_4_dfdat
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mov NONE,DFDAT
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mov NONE,DFDAT
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mov NONE,DFDAT
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mov NONE,DFDAT
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call bcopy_3_dfdat /* Only support 24 bit length. */
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#else
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/*
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* For FreeBSD, just copy it wholesale
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*/
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mvi DINDEX,HADDR
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call bcopy_7_dfdat
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#endif
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/* Load STCNT as well. It is a mirror of HCNT */
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mvi DINDEX,STCNT
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mvi HCNT call bcopy_3
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test SSTAT1,PHASEMIS jz data_phase_loop
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data_phase_finish:
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/*
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* After a DMA finishes, save the SG and STCNT residuals back into the SCB
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* We use STCNT instead of HCNT, since it's a reflection of how many bytes
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* were transferred on the SCSI (as opposed to the host) bus.
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*/
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mvi DINDEX,SCB_RESID_DCNT
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mvi STCNT call bcopy_3
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mov SCB_RESID_SGCNT, SG_COUNT
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jmp ITloop
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/*
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* Command phase. Set up the DMA registers and let 'er rip - the
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* two bytes after the SCB SCSI_cmd_length are zeroed by the driver,
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* so we can copy those three bytes directly into HCNT.
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*/
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p_command:
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call assert
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/*
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* Load HADDR and HCNT. We can do this in one bcopy since they are neighbors
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*/
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mvi DINDEX,HADDR
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mvi SCB_CMDPTR call bcopy_7
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mvi DINDEX,STCNT
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mvi SCB_CMDLEN call bcopy_3
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mvi 0x3d call dma # SCSIEN|SDMAEN|HDMAEN|
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# DIRECTION|FIFORESET
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jmp ITloop
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/*
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* Status phase. Wait for the data byte to appear, then read it
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* and store it into the SCB.
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*/
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p_status:
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mvi SCB_TARGET_STATUS call inb_first
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jmp mesgin_done
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/*
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* Message out phase. If there is no active message, but the target
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* took us into this phase anyway, build a no-op message and send it.
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*/
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p_mesgout:
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test MSG_LEN, 0xff jnz p_mesgout_start
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mvi MSG_NOP call mk_mesg /* build NOP message */
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|
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p_mesgout_start:
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/*
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* Set up automatic PIO transfer from MSG0. Bit 3 in
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* SXFRCTL0 (SPIOEN) is already on.
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*/
|
|
mvi SINDEX,MSG0
|
|
mov DINDEX,MSG_LEN
|
|
|
|
/*
|
|
* When target asks for a byte, drop ATN if it's the last one in
|
|
* the message. Otherwise, keep going until the message is exhausted.
|
|
*
|
|
* Keep an eye out for a phase change, in case the target issues
|
|
* a MESSAGE REJECT.
|
|
*/
|
|
p_mesgout_loop:
|
|
test SSTAT1,PHASEMIS jnz p_mesgout_phasemis
|
|
test SSTAT0,SPIORDY jz p_mesgout_loop
|
|
cmp DINDEX,1 jne p_mesgout_outb /* last byte? */
|
|
mvi CLRSINT1,CLRATNO /* drop ATN */
|
|
p_mesgout_outb:
|
|
or SXFRCTL0, CLRSTCNT
|
|
mvi STCNT0, 1
|
|
dec DINDEX
|
|
mov SCSIDATL,SINDIR
|
|
p_mesgout_outb_wait:
|
|
test SSTAT0,SDONE jz p_mesgout_outb_wait
|
|
|
|
p_mesgout4:
|
|
test DINDEX,0xff jnz p_mesgout_loop
|
|
|
|
/*
|
|
* If the next bus phase after ATN drops is a message out, it means
|
|
* that the target is requesting that the last message(s) be resent.
|
|
*/
|
|
p_mesgout_snoop:
|
|
test SSTAT1,BUSFREE jnz p_mesgout_done
|
|
test SSTAT1,REQINIT jz p_mesgout_snoop
|
|
|
|
test SSTAT1,PHASEMIS jnz p_mesgout_done
|
|
|
|
or SINDEX,0x10,SIGSTATE /* turn on ATNO */
|
|
call scsisig /* ATNO - re-assert ATN */
|
|
|
|
jmp ITloop
|
|
|
|
p_mesgout_phasemis:
|
|
mvi CLRSINT1,CLRATNO /* Be sure turn ATNO off */
|
|
p_mesgout_done:
|
|
clr MSG_LEN /* no active msg */
|
|
jmp ITloop
|
|
|
|
/*
|
|
* Message in phase. Bytes are read using Automatic PIO mode.
|
|
*/
|
|
p_mesgin:
|
|
mvi A call inb_first /* read the 1st message byte */
|
|
mov REJBYTE,A /* save it for the driver */
|
|
|
|
test A,MSG_IDENTIFY jnz mesgin_identify
|
|
cmp A,MSG_DISCONNECT je mesgin_disconnect
|
|
cmp A,MSG_SDPTRS je mesgin_sdptrs
|
|
cmp ALLZEROS,A je mesgin_complete
|
|
cmp A,MSG_RDPTRS je mesgin_rdptrs
|
|
cmp A,MSG_EXTENDED je mesgin_extended
|
|
cmp A,MSG_REJECT je mesgin_reject
|
|
|
|
rej_mesgin:
|
|
/*
|
|
* We have no idea what this message in is, and there's no way
|
|
* to pass it up to the kernel, so we issue a message reject and
|
|
* hope for the best. Since we're now using manual PIO mode to
|
|
* read in the message, there should no longer be a race condition
|
|
* present when we assert ATN. In any case, rejection should be a
|
|
* rare occurrence - signal the driver when it happens.
|
|
*/
|
|
or SINDEX,0x10,SIGSTATE /* turn on ATNO */
|
|
call scsisig
|
|
mvi INTSTAT,SEND_REJECT /* let driver know */
|
|
|
|
mvi MSG_REJECT call mk_mesg
|
|
|
|
mesgin_done:
|
|
call inb_last /*ack & turn auto PIO back on*/
|
|
jmp ITloop
|
|
|
|
|
|
mesgin_complete:
|
|
/*
|
|
* We got a "command complete" message, so put the SCB pointer
|
|
* into the Queue Out, and trigger a completion interrupt.
|
|
* Check status for non zero return and interrupt driver if needed
|
|
* This allows the driver to interpret errors only when they occur
|
|
* instead of always uploading the scb. If the status is SCSI_CHECK,
|
|
* the driver will download a new scb requesting sense to replace
|
|
* the old one, modify the "waiting for selection" SCB list and set
|
|
* RETURN_1 to 0x80. If RETURN_1 is set to 0x80 the sequencer imediately
|
|
* jumps to main loop where it will run down the waiting SCB list.
|
|
* If the kernel driver does not wish to request sense, it need
|
|
* only clear RETURN_1, and the command is allowed to complete. We don't
|
|
* bother to post to the QOUTFIFO in the error case since it would require
|
|
* extra work in the kernel driver to ensure that the entry was removed
|
|
* before the command complete code tried processing it.
|
|
*
|
|
* First check for residuals
|
|
*/
|
|
test SCB_RESID_SGCNT,0xff jz check_status
|
|
/*
|
|
* If we have a residual count, interrupt and tell the host. Other
|
|
* alternatives are to pause the sequencer on all command completes (yuck),
|
|
* dma the resid directly to the host (slick, we may have space to do it now)
|
|
* or have the sequencer pause itself when it encounters a non-zero resid
|
|
* (unecessary pause just to flag the command -yuck-, but takes one instruction
|
|
* and since it shouldn't happen that often is good enough for our purposes).
|
|
*/
|
|
resid:
|
|
mvi INTSTAT,RESIDUAL
|
|
|
|
check_status:
|
|
test SCB_TARGET_STATUS,0xff jz status_ok /* Good Status? */
|
|
mvi INTSTAT,BAD_STATUS /* let driver know */
|
|
cmp RETURN_1, SEND_SENSE jne status_ok
|
|
jmp mesgin_done
|
|
|
|
status_ok:
|
|
/* First, mark this target as free. */
|
|
test SCB_CONTROL,TAG_ENB jnz test_immediate /*
|
|
* Tagged commands
|
|
* don't busy the
|
|
* target.
|
|
*/
|
|
mov FUNCTION1,SCB_TCL
|
|
mov A,FUNCTION1
|
|
test SCB_TCL,0x88 jz clear_a
|
|
xor ACTIVE_B,A
|
|
jmp test_immediate
|
|
|
|
clear_a:
|
|
xor ACTIVE_A,A
|
|
|
|
test_immediate:
|
|
test SCB_CMDLEN,0xff jnz complete /* Immediate message complete */
|
|
/*
|
|
* Pause the sequencer until the driver gets around to handling the command
|
|
* complete. This is so that any action that might require carefull timing
|
|
* with the completion of this command can occur.
|
|
*/
|
|
mvi INTSTAT,IMMEDDONE
|
|
jmp start
|
|
complete:
|
|
mov QOUTFIFO,SCBPTR
|
|
mvi INTSTAT,CMDCMPLT
|
|
jmp mesgin_done
|
|
|
|
|
|
/*
|
|
* Is it an extended message? We only support the synchronous and wide data
|
|
* transfer request messages, which will probably be in response to
|
|
* WDTR or SDTR message outs from us. If it's not SDTR or WDTR, reject it -
|
|
* apparently this can be done after any message in byte, according
|
|
* to the SCSI-2 spec.
|
|
*/
|
|
mesgin_extended:
|
|
mvi ARG_1 call inb_next /* extended message length */
|
|
mvi A call inb_next /* extended message code */
|
|
|
|
cmp A,MSG_SDTR je p_mesginSDTR
|
|
cmp A,MSG_WDTR je p_mesginWDTR
|
|
jmp rej_mesgin
|
|
|
|
p_mesginWDTR:
|
|
cmp ARG_1,2 jne rej_mesgin /* extended mesg length=2 */
|
|
mvi ARG_1 call inb_next /* Width of bus */
|
|
mvi INTSTAT,WDTR_MSG /* let driver know */
|
|
test RETURN_1,0xff jz mesgin_done /* Do we need to send WDTR? */
|
|
cmp RETURN_1,SEND_REJ je rej_mesgin /*
|
|
* Bus width was too large
|
|
* Reject it.
|
|
*/
|
|
|
|
/* We didn't initiate the wide negotiation, so we must respond to the request */
|
|
and RETURN_1,0x7f /* Clear the SEND_WDTR Flag */
|
|
mvi DINDEX,MSG0
|
|
mvi MSG0 call mk_wdtr /* build WDTR message */
|
|
or SINDEX,0x10,SIGSTATE /* turn on ATNO */
|
|
call scsisig
|
|
jmp mesgin_done
|
|
|
|
p_mesginSDTR:
|
|
cmp ARG_1,3 jne rej_mesgin /* extended mesg length=3 */
|
|
mvi ARG_1 call inb_next /* xfer period */
|
|
mvi A call inb_next /* REQ/ACK offset */
|
|
mvi INTSTAT,SDTR_MSG /* call driver to convert */
|
|
|
|
test RETURN_1,0xff jz mesgin_done /* Do we need to mk_sdtr/rej */
|
|
cmp RETURN_1,SEND_REJ je rej_mesgin /*
|
|
* Requested SDTR too small
|
|
* Reject it.
|
|
*/
|
|
mvi DINDEX, MSG0
|
|
mvi MSG0 call mk_sdtr
|
|
or SINDEX,0x10,SIGSTATE /* turn on ATNO */
|
|
call scsisig
|
|
jmp mesgin_done
|
|
|
|
/*
|
|
* Is it a disconnect message? Set a flag in the SCB to remind us
|
|
* and await the bus going free.
|
|
*/
|
|
mesgin_disconnect:
|
|
or SCB_CONTROL,DISCONNECTED
|
|
jmp mesgin_done
|
|
|
|
/*
|
|
* Save data pointers message? Copy working values into the SCB,
|
|
* usually in preparation for a disconnect.
|
|
*/
|
|
mesgin_sdptrs:
|
|
call sg_ram2scb
|
|
jmp mesgin_done
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
mesgin_rdptrs:
|
|
and FLAGS,0xfb /*
|
|
* !DPHASE we'll reload them
|
|
* the next time through
|
|
*/
|
|
jmp mesgin_done
|
|
|
|
/*
|
|
* 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:
|
|
test A,0x78 jnz rej_mesgin /*!DiscPriv|!LUNTAR|!Reserved*/
|
|
|
|
and A,0x07 /* lun in lower three bits */
|
|
or SAVED_TCL,A,SELID
|
|
and SAVED_TCL,0xf7
|
|
and A,SELBUSB,SBLKCTL /* B Channel?? */
|
|
or SAVED_TCL,A
|
|
call inb_last /* ACK */
|
|
|
|
/*
|
|
* Here we "snoop" the bus looking for a SIMPLE QUEUE TAG message.
|
|
* If we get one, we use the tag returned to switch to the proper
|
|
* SCB. Otherwise, we just use the findSCB method.
|
|
*/
|
|
snoop_tag_loop:
|
|
test SSTAT1,BUSFREE jnz use_findSCB
|
|
test SSTAT1,REQINIT jz snoop_tag_loop
|
|
test SSTAT1,PHASEMIS jnz use_findSCB
|
|
mvi A call inb_first
|
|
cmp A,MSG_SIMPLE_TAG je get_tag
|
|
use_findSCB:
|
|
mov ALLZEROS call findSCB /* Have to search */
|
|
setup_SCB:
|
|
and SCB_CONTROL,0xfb /* clear disconnect bit in SCB */
|
|
or FLAGS,IDENTIFY_SEEN /* make note of IDENTIFY */
|
|
jmp ITloop
|
|
get_tag:
|
|
mvi ARG_1 call inb_next /* tag value */
|
|
/*
|
|
* See if the tag is in range. The tag is < SCBCOUNT if we add
|
|
* the complement of SCBCOUNT to the incomming tag and there is
|
|
* no carry.
|
|
*/
|
|
mov A,COMP_SCBCOUNT
|
|
add SINDEX,A,ARG_1
|
|
jc abort_tag
|
|
|
|
/*
|
|
* Ensure that the SCB the tag points to is for an SCB transaction
|
|
* to the reconnecting target.
|
|
*/
|
|
mov SCBPTR,ARG_1
|
|
mov A,SAVED_TCL
|
|
cmp SCB_TCL,A jne abort_tag
|
|
test SCB_CONTROL,TAG_ENB jz abort_tag
|
|
call inb_last /* Ack Successful tag */
|
|
jmp setup_SCB
|
|
abort_tag:
|
|
or SINDEX,0x10,SIGSTATE /* turn on ATNO */
|
|
call scsisig
|
|
mvi INTSTAT,ABORT_TAG /* let driver know */
|
|
mvi 0xd call mk_mesg /* ABORT TAG message */
|
|
jmp mesgin_done
|
|
|
|
/*
|
|
* Message reject? Let the kernel driver handle this. If we have an
|
|
* outstanding WDTR or SDTR negotiation, assume that it's a response from
|
|
* the target selecting 8bit or asynchronous transfer, otherwise just ignore
|
|
* it since we have no clue what it pertains to.
|
|
*/
|
|
mesgin_reject:
|
|
mvi INTSTAT, REJECT_MSG
|
|
jmp mesgin_done
|
|
|
|
/*
|
|
* [ ADD MORE MESSAGE HANDLING HERE ]
|
|
*/
|
|
|
|
/*
|
|
* Bus free phase. It might be useful to interrupt the device
|
|
* driver if we aren't expecting this. For now, make sure that
|
|
* ATN isn't being asserted and look for a new command.
|
|
*/
|
|
p_busfree:
|
|
mvi CLRSINT1,CLRATNO
|
|
|
|
/*
|
|
* if this is an immediate command, perform a psuedo command complete to
|
|
* notify the driver.
|
|
*/
|
|
test SCB_CMDLEN,0xff jz status_ok
|
|
jmp start
|
|
|
|
/*
|
|
* Instead of a generic bcopy routine that requires an argument, we unroll
|
|
* the cases that are actually used, and call them explicitly. This
|
|
* not only reduces the overhead of doing a bcopy, but ends up saving space
|
|
* in the program since you don't have to put the argument into the accumulator
|
|
* before the call. Both functions expect DINDEX to contain the destination
|
|
* address and SINDEX to contain the source address.
|
|
*/
|
|
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
|
|
|
|
bcopy_7_dfdat:
|
|
mov DINDIR,DFDAT
|
|
mov DINDIR,DFDAT
|
|
bcopy_5_dfdat:
|
|
mov DINDIR,DFDAT
|
|
bcopy_4_dfdat:
|
|
mov DINDIR,DFDAT
|
|
bcopy_3_dfdat:
|
|
mov DINDIR,DFDAT
|
|
mov DINDIR,DFDAT
|
|
mov DINDIR,DFDAT ret
|
|
|
|
/*
|
|
* Locking the driver out, build a one-byte message passed in SINDEX
|
|
* if there is no active message already. SINDEX is returned intact.
|
|
*/
|
|
mk_mesg:
|
|
mvi SEQCTL,0x50 /* PAUSEDIS|FASTMODE */
|
|
test MSG_LEN,0xff jz mk_mesg1 /* Should always succeed */
|
|
|
|
/*
|
|
* Hmmm. For some reason the mesg buffer is in use.
|
|
* Tell the driver. It should look at SINDEX to find
|
|
* out what we wanted to use the buffer for and resolve
|
|
* the conflict.
|
|
*/
|
|
mvi SEQCTL,0x10 /* !PAUSEDIS|FASTMODE */
|
|
mvi INTSTAT,MSG_BUFFER_BUSY ret
|
|
|
|
mk_mesg1:
|
|
mvi MSG_LEN,1 /* length = 1 */
|
|
mov MSG0,SINDEX /* 1-byte message */
|
|
mvi SEQCTL,0x10 ret /* !PAUSEDIS|FASTMODE */
|
|
|
|
/*
|
|
* 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:
|
|
call inb_last
|
|
inb_first:
|
|
test SSTAT1,PHASEMIS jnz mesgin_phasemis
|
|
test SSTAT0,SPIORDY jz inb_first /* wait for next byte */
|
|
mov DINDEX,SINDEX
|
|
mov DINDIR,SCSIBUSL ret /*read byte directly from bus*/
|
|
inb_last:
|
|
or SXFRCTL0,CLRSTCNT
|
|
mvi STCNT0,0x01
|
|
mov NONE,SCSIDATL /*dummy read from latch to ACK*/
|
|
inb_last_wait:
|
|
test SSTAT0,SDONE jz inb_last_wait /* Wait for completion */
|
|
ret
|
|
|
|
mesgin_phasemis:
|
|
/*
|
|
* We expected to receive another byte, but the target changed phase
|
|
*/
|
|
mvi INTSTAT, MSGIN_PHASEMIS
|
|
jmp ITloop
|
|
|
|
/*
|
|
* DMA data transfer. HADDR and HCNT must be loaded first, and
|
|
* SINDEX should contain the value to load DFCNTRL with - 0x3d for
|
|
* host->scsi, or 0x39 for scsi->host. The SCSI channel is cleared
|
|
* during initialization.
|
|
*/
|
|
dma:
|
|
mov DFCNTRL,SINDEX
|
|
dma1:
|
|
test SSTAT0,DMADONE jnz dma3
|
|
test SSTAT1,PHASEMIS jz dma1 /* ie. underrun */
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
dma3:
|
|
test SINDEX,DIRECTION jnz dma5
|
|
dma4:
|
|
test DFSTATUS,FIFOEMP jz dma4
|
|
|
|
/*
|
|
* Now shut the DMA enables off and make sure that the DMA enables are
|
|
* actually off first lest we get an ILLSADDR.
|
|
*/
|
|
dma5:
|
|
/* disable DMA, but maintain WIDEODD */
|
|
and A, WIDEODD, SINDEX
|
|
mov DFCNTRL, A
|
|
dma6:
|
|
test DFCNTRL,0x38 jnz dma6 /* SCSIENACK|SDMAENACK|HDMAENACK */
|
|
|
|
ret
|
|
|
|
dma_finish:
|
|
test DFSTATUS,HDONE jz dma_finish
|
|
|
|
clr DFCNTRL /* disable DMA */
|
|
dma_finish2:
|
|
test DFCNTRL,HDMAENACK jnz dma_finish2
|
|
ret
|
|
|
|
/*
|
|
* Common SCSI initialization for selection and reselection. Expects
|
|
* the target SCSI ID to be in the upper four bits of SINDEX, and A's
|
|
* contents are stomped on return.
|
|
*/
|
|
initialize_scsiid:
|
|
and SINDEX,0xf0 /* Get target ID */
|
|
and A,0x0f,SCSIID
|
|
or SINDEX,A
|
|
mov SCSIID,SINDEX ret
|
|
|
|
/*
|
|
* Assert that if we've been reselected, then we've seen an IDENTIFY
|
|
* message.
|
|
*/
|
|
assert:
|
|
test FLAGS,RESELECTED jz return /* reselected? */
|
|
test FLAGS,IDENTIFY_SEEN jnz return /* seen IDENTIFY? */
|
|
|
|
mvi INTSTAT,NO_IDENT ret /* no - cause a kernel panic */
|
|
|
|
/*
|
|
* Locate the SCB matching the target ID/channel/lun in SAVED_TCL and switch
|
|
* the SCB to it. Have the kernel print a warning message if it can't be
|
|
* found, and generate an ABORT message to the target. SINDEX should be
|
|
* cleared on call.
|
|
*/
|
|
findSCB:
|
|
mov A,SAVED_TCL
|
|
mov SCBPTR,SINDEX /* switch to new SCB */
|
|
cmp SCB_TCL,A jne findSCB1 /* target ID/channel/lun match? */
|
|
test SCB_CONTROL,DISCONNECTED jz findSCB1 /*should be disconnected*/
|
|
ret
|
|
|
|
findSCB1:
|
|
inc SINDEX
|
|
mov A,SCBCOUNT
|
|
cmp SINDEX,A jne findSCB
|
|
|
|
mvi INTSTAT,NO_MATCH /* not found - signal kernel */
|
|
mvi MSG_ABORT call mk_mesg /* ABORT message */
|
|
|
|
or SINDEX,0x10,SIGSTATE /* assert ATNO */
|
|
call scsisig
|
|
ret
|
|
/*
|
|
* Make a working copy of the scatter-gather parameters from the SCB.
|
|
*/
|
|
sg_scb2ram:
|
|
mvi DINDEX,HADDR
|
|
mvi SCB_DATAPTR call bcopy_7
|
|
|
|
mvi DINDEX,STCNT
|
|
mvi SCB_DATACNT call bcopy_3
|
|
|
|
mov SG_COUNT,SCB_SGCOUNT
|
|
|
|
mvi DINDEX,SG_NEXT
|
|
mvi SCB_SGPTR call bcopy_4
|
|
ret
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
sg_ram2scb:
|
|
test FLAGS, DPHASE jz return
|
|
mov SCB_SGCOUNT,SG_COUNT
|
|
|
|
mvi DINDEX,SCB_SGPTR
|
|
mvi SG_NEXT call bcopy_4
|
|
|
|
mvi DINDEX,SCB_DATAPTR
|
|
mvi SHADDR call bcopy_4
|
|
|
|
/*
|
|
* Use the residual number since STCNT is corrupted by any message transfer
|
|
*/
|
|
mvi SCB_RESID_DCNT call bcopy_3
|
|
ret
|
|
|
|
/*
|
|
* Add the array base TARG_SCRATCH to the target offset (the target address
|
|
* is in SCSIID), and return the result in SINDEX. The accumulator
|
|
* contains the 3->8 decoding of the target ID on return.
|
|
*/
|
|
ndx_dtr:
|
|
shr A,SCSIID,4
|
|
test SBLKCTL,SELBUSB jz ndx_dtr_2
|
|
or A,0x08 /* Channel B entries add 8 */
|
|
ndx_dtr_2:
|
|
add SINDEX,TARG_SCRATCH,A
|
|
|
|
mov FUNCTION1,SCSIID /* 3-bit target address decode */
|
|
mov A,FUNCTION1 ret
|
|
|
|
/*
|
|
* If we need to negotiate transfer parameters, build the WDTR or SDTR message
|
|
* starting at the address passed in SINDEX. DINDEX is modified on return.
|
|
* The SCSI-II spec requires that Wide negotiation occur first and you can
|
|
* only negotiat one or the other at a time otherwise in the event of a message
|
|
* reject, you wouldn't be able to tell which message was the culpret.
|
|
*/
|
|
mk_dtr:
|
|
test SCB_CONTROL,0x90 jz return /* NEEDWDTR|NEEDSDTR */
|
|
test SCB_CONTROL,NEEDWDTR jnz mk_wdtr_16bit
|
|
or FLAGS, MAXOFFSET /* Force an offset of 15 or 8 if WIDE */
|
|
|
|
mk_sdtr:
|
|
mvi DINDIR,1 /* extended message */
|
|
mvi DINDIR,3 /* extended message length = 3 */
|
|
mvi DINDIR,1 /* SDTR code */
|
|
call sdtr_to_rate
|
|
mov DINDIR,RETURN_1 /* REQ/ACK transfer period */
|
|
test FLAGS, MAXOFFSET jnz mk_sdtr_max_offset
|
|
and DINDIR,0x0f,SINDIR /* Sync Offset */
|
|
|
|
mk_sdtr_done:
|
|
add MSG_LEN,COMP_MSG0,DINDEX ret /* update message length */
|
|
|
|
mk_sdtr_max_offset:
|
|
/*
|
|
* We're initiating sync negotiation, so request the max offset we can (15 or 8)
|
|
*/
|
|
xor FLAGS, MAXOFFSET
|
|
|
|
/* Talking to a WIDE device? */
|
|
test SCSIRATE, WIDEXFER jnz wmax_offset
|
|
mvi DINDIR, MAX_OFFSET_8BIT
|
|
jmp mk_sdtr_done
|
|
|
|
wmax_offset:
|
|
mvi DINDIR, MAX_OFFSET_16BIT
|
|
jmp mk_sdtr_done
|
|
|
|
mk_wdtr_16bit:
|
|
mvi ARG_1,BUS_16_BIT
|
|
mk_wdtr:
|
|
mvi DINDIR,1 /* extended message */
|
|
mvi DINDIR,2 /* extended message length = 2 */
|
|
mvi DINDIR,3 /* WDTR code */
|
|
mov DINDIR,ARG_1 /* bus width */
|
|
|
|
add MSG_LEN,COMP_MSG0,DINDEX ret /* update message length */
|
|
|
|
/*
|
|
* Set SCSI bus control signal state. This also saves the last-written
|
|
* value into a location where the higher-level driver can read it - if
|
|
* it has to send an ABORT or RESET message, then it needs to know this
|
|
* so it can assert ATN without upsetting SCSISIGO. The new value is
|
|
* expected in SINDEX. Change the actual state last to avoid contention
|
|
* from the driver.
|
|
*/
|
|
scsisig:
|
|
mov SIGSTATE,SINDEX
|
|
mov SCSISIGO,SINDEX ret
|
|
|
|
sdtr_to_rate:
|
|
call ndx_dtr /* index scratch space for target */
|
|
shr A,SINDIR,0x4
|
|
dec SINDEX /* Preserve SINDEX */
|
|
and A,0x7
|
|
clr RETURN_1
|
|
sdtr_to_rate_loop:
|
|
test A,0x0f jz sdtr_to_rate_done
|
|
add RETURN_1,0x19
|
|
dec A
|
|
jmp sdtr_to_rate_loop
|
|
sdtr_to_rate_done:
|
|
shr RETURN_1,0x2
|
|
add RETURN_1,0x19
|
|
test SXFRCTL0,ULTRAEN jz return
|
|
shr RETURN_1,0x1
|
|
return:
|
|
ret
|