patch-1.3.64 linux/drivers/scsi/aic7xxx.seq
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- Lines: 2013
- Date:
Thu Feb 15 06:57:02 1996
- Orig file:
v1.3.63/linux/drivers/scsi/aic7xxx.seq
- Orig date:
Tue Jan 23 21:15:43 1996
diff -u --recursive --new-file v1.3.63/linux/drivers/scsi/aic7xxx.seq linux/drivers/scsi/aic7xxx.seq
@@ -1,907 +1,797 @@
-##+M#########################################################################
-# Adaptec 274x/284x/294x device driver for Linux and FreeBSD.
-#
-# Copyright (c) 1994 John Aycock
-# The University of Calgary Department of Computer Science.
-#
-# Modifications/enhancements:
-# Copyright (c) 1994, 1995 Justin Gibbs. All rights reserved.
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; see the file COPYING. If not, write to
-# the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-#
-# FreeBSD, Twin, Wide, 2 command per target support, tagged queuing and other
-# optimizations provided by Justin T. Gibbs (gibbs@FreeBSD.org)
-##-M#########################################################################
-
-VERSION AIC7XXX_SEQ_VER "$Id: aic7xxx.seq,v 2.3 1995/11/10 10:51:22 deang Exp $"
-
-SCBMASK = 0xff
-
-SCSISEQ = 0x00
-ENRSELI = 0x10
-SXFRCTL0 = 0x01
-ULTRAEN = 0x20
-SXFRCTL1 = 0x02
-SCSISIGI = 0x03
-SCSISIGO = 0x03
-SCSIRATE = 0x04
-SCSIID = 0x05
-SCSIDATL = 0x06
-STCNT = 0x08
-STCNT+0 = 0x08
-STCNT+1 = 0x09
-STCNT+2 = 0x0a
-CLRSINT0 = 0x0b
-SSTAT0 = 0x0b
-SELDO = 0x40
-SELDI = 0x20
-CLRSINT1 = 0x0c
-SSTAT1 = 0x0c
-PHASEMIS = 0x10
-SIMODE1 = 0x11
-SCSIBUSL = 0x12
-SHADDR = 0x14
-SELID = 0x19
-SBLKCTL = 0x1f
-SEQCTL = 0x60
-A = 0x64 # == ACCUM
-SINDEX = 0x65
-DINDEX = 0x66
-ALLZEROS = 0x6a
-NONE = 0x6a
-SINDIR = 0x6c
-DINDIR = 0x6d
-FUNCTION1 = 0x6e
-HADDR = 0x88
-HADDR+1 = 0x89
-HADDR+2 = 0x8a
-HADDR+3 = 0x8b
-HCNT = 0x8c
-HCNT+0 = 0x8c
-HCNT+1 = 0x8d
-HCNT+2 = 0x8e
-SCBPTR = 0x90
-INTSTAT = 0x91
-DFCNTRL = 0x93
-DFSTATUS = 0x94
-DFDAT = 0x99
-QINFIFO = 0x9b
-QINCNT = 0x9c
-QOUTFIFO = 0x9d
-
-SCSICONF_A = 0x5a
-SCSICONF_B = 0x5b
-
-# The two reserved bytes at SCBARRAY+1[23] are expected to be set to
-# zero. Bit 3 in SCBARRAY+0 is used as an internal flag to indicate
-# whether or not to DMA an SCB from host ram. This flag prevents the
-# "re-fetching" of transactions that are requed because the target is
-# busy with another command. We also use bits 6 & 7 to indicate whether
-# or not to initiate SDTR or WDTR repectively when starting this command.
-#
-SCBARRAY+0 = 0xa0
-
-DISCONNECTED = 0x04
-NEEDDMA = 0x08
-NEEDSDTR = 0x10
-TAG_ENB = 0x20
-DISCENB = 0x40
-NEEDWDTR = 0x80
-
-SCBARRAY+1 = 0xa1
-SCBARRAY+2 = 0xa2
-SCBARRAY+3 = 0xa3
-SCBARRAY+4 = 0xa4
-SCBARRAY+5 = 0xa5
-SCBARRAY+6 = 0xa6
-SCBARRAY+7 = 0xa7
-SCBARRAY+8 = 0xa8
-SCBARRAY+9 = 0xa9
-SCBARRAY+10 = 0xaa
-SCBARRAY+11 = 0xab
-SCBARRAY+12 = 0xac
-SCBARRAY+13 = 0xad
-SCBARRAY+14 = 0xae
-SCBARRAY+15 = 0xaf
-SCBARRAY+16 = 0xb0
-SCBARRAY+17 = 0xb1
-SCBARRAY+18 = 0xb2
-SCBARRAY+19 = 0xb3
-SCBARRAY+20 = 0xb4
-SCBARRAY+21 = 0xb5
-SCBARRAY+22 = 0xb6
-SCBARRAY+23 = 0xb7
-SCBARRAY+24 = 0xb8
-SCBARRAY+25 = 0xb9
-SCBARRAY+26 = 0xba
-SCBARRAY+27 = 0xbb
-SCBARRAY+28 = 0xbc
-SCBARRAY+29 = 0xbd
-SCBARRAY+30 = 0xbe
-
-BAD_PHASE = 0x01 # unknown scsi bus phase
-CMDCMPLT = 0x02 # Command Complete
-SEND_REJECT = 0x11 # sending a message reject
-NO_IDENT = 0x21 # no IDENTIFY after reconnect
-NO_MATCH = 0x31 # no cmd match for reconnect
-MSG_SDTR = 0x41 # SDTR message received
-MSG_WDTR = 0x51 # WDTR message received
-MSG_REJECT = 0x61 # Reject message received
-BAD_STATUS = 0x71 # Bad status from target
-RESIDUAL = 0x81 # Residual byte count != 0
-ABORT_TAG = 0x91 # Sent an ABORT_TAG message
-AWAITING_MSG = 0xa1 # Kernel requested to specify
- # a message to this target
- # (command was null), so tell
- # it that it can fill the
- # message buffer.
-IMMEDDONE = 0xb1
-
-
-# The host adapter card (at least the BIOS) uses 20-2f for SCSI
-# device information, 32-33 and 5a-5f as well. As it turns out, the
-# BIOS trashes 20-2f, writing the synchronous negotiation results
-# on top of the BIOS values, so we re-use those for our per-target
-# scratchspace (actually a value that can be copied directly into
-# SCSIRATE). The kernel driver will enable synchronous negotiation
-# for all targets that have a value other than 0 in the lower four
-# bits of the target scratch space. This should work regardless of
-# whether the bios has been installed. NEEDSDTR and NEEDWDTR are the
-# fouth and sevent bits of the SCB control byte. The kernel driver
-# will set these when a WDTR or SDTR message should be sent to the
-# target the SCB's command references.
-#
-# REJBYTE contains the first byte of a MESSAGE IN message, so the driver
-# can report an intelligible error if a message is rejected.
-#
-# FLAGS's high bit is true if we are currently handling a reselect;
-# its next-highest bit is true ONLY IF we've seen an IDENTIFY message
-# from the reselecting target. If we haven't had IDENTIFY, then we have
-# no idea what the lun is, and we can't select the right SCB register
-# bank, so force a kernel panic if the target attempts a data in/out or
-# command phase instead of corrupting something. FLAGS also contains
-# configuration bits so that we can optimize for TWIN and WIDE controllers,
-# the MAX_OFFSET bit which we set when we want to negotiate for maximum sync
-# offset irregardless of what the per target scratch space says.
-#
-# Note that SG_NEXT occupies four bytes.
-#
-SYNCNEG = 0x20
-
-REJBYTE = 0x31
-DISC_DSB_A = 0x32
-DISC_DSB_B = 0x33
-
-MSG_LEN = 0x34
-MSG_START+0 = 0x35
-MSG_START+1 = 0x36
-MSG_START+2 = 0x37
-MSG_START+3 = 0x38
-MSG_START+4 = 0x39
-MSG_START+5 = 0x3a
--MSG_START+0 = 0xcb # 2's complement of MSG_START+0
-
-ARG_1 = 0x4a # sdtr conversion args & return
-BUS_16_BIT = 0x01
-RETURN_1 = 0x4a
-
-SIGSTATE = 0x4b # value written to SCSISIGO
-
-# Linux users should use 0xc (12) for SG_SIZEOF
-#SG_SIZEOF = 0x8 # sizeof(struct ahc_dma)
-SG_SIZEOF = 0xc # sizeof(struct scatterlist)
-SCB_SIZEOF = 0x1a # sizeof SCB to DMA (26 bytes)
-
-DMAPARAMS = 0x4c # Parameters for DMA
-SG_COUNT = 0x4d # working value of SG count
-SG_NEXT = 0x4e # working value of SG pointer
-SG_NEXT+0 = 0x4e
-SG_NEXT+1 = 0x4f
-SG_NEXT+2 = 0x50
-SG_NEXT+3 = 0x51
-
-SCBCOUNT = 0x52 # the actual number of SCBs
-FLAGS = 0x53 # Device configuration flags
-TWIN_BUS = 0x01
-WIDE_BUS = 0x02
-DPHASE = 0x04
-MAX_OFFSET = 0x08
-ACTIVE_MSG = 0x20
-IDENTIFY_SEEN = 0x40
-RESELECTED = 0x80
-
-MAX_OFFSET_8BIT = 0x0f
-MAX_OFFSET_WIDE = 0x08
-
-ACTIVE_A = 0x54
-ACTIVE_B = 0x55
-SAVED_TCL = 0x56 # Temporary storage for the
- # target/channel/lun of a
- # reconnecting target
-# After starting the selection hardware, we return to the "poll_for_work"
-# loop so that we can check for reconnecting targets as well as for our
-# selection to complete just in case the reselection wins bus arbitration.
-# The problem with this is that we must keep track of the SCB that we've
-# already pulled from the QINFIFO and started the selection on just in case
-# the reselection wins so that we can retry the selection at a later time.
-# This problem cannot be resolved by holding a single entry in scratch
-# ram since a reconnecting target can request sense and this will create
-# yet another SCB waiting for selection. The solution used here is to
-# use byte 31 of the SCB as a psuedo-next pointer and to thread a list
-# of SCBs that are awaiting selection. Since 0-0xfe are valid SCB offsets,
-# SCB_LIST_NULL is 0xff which is out of range. The kernel driver must
-# add an entry to this list everytime a request sense occurs. The sequencer
-# will automatically consume the entries.
-
-WAITING_SCBH = 0x57 # head of list of SCBs awaiting
- # selection
-WAITING_SCBT = 0x58 # tail of list of SCBs awaiting
- # selection
-SCB_LIST_NULL = 0xff
-
-
-# Poll QINCNT for work - the lower bits contain
-# the number of entries in the Queue In FIFO.
-#
+/*+M*************************************************************************
+ * Adaptec 274x/284x/294x device driver for Linux and FreeBSD.
+ *
+ * Copyright (c) 1994 John Aycock
+ * The University of Calgary Department of Computer Science.
+ *
+ *Modifications/enhancements:
+ * Copyright (c) 1994, 1995, 1996 Justin Gibbs. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING. If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * FreeBSD, Twin, Wide, 2 command per target support, tagged queuing and other
+ * optimizations provided by Justin T. Gibbs (gibbs@FreeBSD.org)
+ *-M*************************************************************************/
+
+VERSION AIC7XXX_SEQ_VER "$Id: aic7xxx.seq,v 2.8 1996/02/10 06:23:39 deang Exp $"
+
+#ifdef linux
+#include "aic7xxx_reg.h"
+#else
+#include "../../dev/aic7xxx/aic7xxx_reg.h"
+#endif
+
+/*
+ * We can't just use ACCUM in the sequencer code because it
+ * must be treated specially by the assembler, and it currently
+ * looks for the symbol 'A'. This is the only register defined in
+ * the assembler's symbol space.
+ */
+A = ACCUM
+
+/* After starting the selection hardware, we check for reconnecting targets
+ * as well as for our selection to complete just in case the reselection wins
+ * bus arbitration. The problem with this is that we must keep track of the
+ * SCB that we've already pulled from the QINFIFO and started the selection
+ * on just in case the reselection wins so that we can retry the selection at
+ * a later time. This problem cannot be resolved by holding a single entry
+ * in scratch ram since a reconnecting target can request sense and this will
+ * create yet another SCB waiting for selection. The solution used here is to
+ * use byte 27 of the SCB as a psuedo-next pointer and to thread a list
+ * of SCBs that are awaiting selection. Since 0-0xfe are valid SCB offsets,
+ * SCB_LIST_NULL is 0xff which is out of range. The kernel driver must
+ * add an entry to this list everytime a request sense occurs. The sequencer
+ * will automatically consume the entries.
+ */
+
+/*
+ * Initialize any state valid during the idle loop here. This code is
+ * executed on startup and after every bus free.
+ */
+start:
+ mvi SCSISEQ,ENRSELI /* Always allow reselection */
poll_for_work:
- test FLAGS,TWIN_BUS jz start2 # Are we a twin channel device?
-# For fairness, we check the other bus first, since we just finished a
-# transaction on the current channel.
- xor SBLKCTL,0x08 # Toggle to the other bus
+ /*
+ * Are we a twin channel device?
+ * For fairness, we check the other bus first,
+ * since we just finished a transaction on the
+ * current channel.
+ */
+ test FLAGS,TWIN_BUS jz start2
+ xor SBLKCTL,SELBUSB /* Toggle to the other bus */
test SSTAT0,SELDI jnz reselect
- xor SBLKCTL,0x08 # Toggle to the original bus
+ xor SBLKCTL,SELBUSB /* Toggle to the original bus */
start2:
test SSTAT0,SELDI jnz reselect
cmp WAITING_SCBH,SCB_LIST_NULL jne start_waiting
- test QINCNT,SCBMASK jz poll_for_work
+ test QINCNT,0xff jz poll_for_work
-# We have at least one queued SCB now and we don't have any
-# SCBs in the list of SCBs awaiting selection. Set the SCB
-# pointer from the FIFO so we see the right bank of SCB
-# registers, then set SCSI options and set the initiator and
-# target SCSI IDs.
-#
+/*
+ * We have at least one queued SCB now and we don't have any
+ * SCBs in the list of SCBs awaiting selection. Set the SCB
+ * pointer from the FIFO so we see the right bank of SCB
+ * registers.
+ */
mov SCBPTR,QINFIFO
-# If the control byte of this SCB has the NEEDDMA flag set, we have
-# yet to DMA it from host memory
-
-test SCBARRAY+0,NEEDDMA jz test_busy
- clr HCNT+2
- clr HCNT+1
- mvi HCNT+0,SCB_SIZEOF
-
- mvi DINDEX,HADDR
- mvi SCBARRAY+26 call bcopy_4
-
- mvi DFCNTRL,0xd # HDMAEN|DIRECTION|FIFORESET
-
-# Wait for DMA from host memory to data FIFO to complete, then disable
-# DMA and wait for it to acknowledge that it's off.
-#
- call dma_finish
-
-# Copy the SCB from the FIFO to the SCBARRAY
-
- mvi DINDEX, SCBARRAY+0
- call bcopy_5_dfdat
- call bcopy_7_dfdat
- call bcopy_7_dfdat
- call bcopy_7_dfdat
-
-# See if there is not already an active SCB for this target. This code
-# locks out on a per target basis instead of target/lun. Although this
-# is not ideal for devices that have multiple luns active at the same
-# time, it is faster than looping through all SCB's looking for active
-# commands. It may be benificial to make findscb a more general procedure
-# to see if the added cost of the search is negligible. This code also
-# assumes that the kernel driver will clear the active flags on board
-# initialization, board reset, and a target's SELTO.
+/*
+ * See if there is not already an active SCB for this target. This code
+ * locks out on a per target basis instead of target/lun. Although this
+ * is not ideal for devices that have multiple luns active at the same
+ * time, it is faster than looping through all SCB's looking for active
+ * commands. It may be benificial to make findscb a more general procedure
+ * to see if the added cost of the search is negligible. This code also
+ * assumes that the kernel driver will clear the active flags on board
+ * initialization, board reset, and a target SELTO. Tagged commands
+ * don't set the active bits since you can queue more than one command
+ * at a time. We do, however, look to see if there are any non-tagged
+ * I/Os in progress, and requeue the command if there are. Tagged and
+ * non-tagged commands cannot be mixed to a single target.
+ */
test_busy:
- and FUNCTION1,0x70,SCBARRAY+1
+ mov FUNCTION1,SCB_TCL
mov A,FUNCTION1
- test SCBARRAY+1,0x88 jz test_a # Id < 8 && A channel
+ test SCB_TCL,0x88 jz test_a /* Id < 8 && A channel */
test ACTIVE_B,A jnz requeue
- test SCBARRAY+0,TAG_ENB jnz start_scb
- or ACTIVE_B,A # Mark the current target as busy
+ test SCB_CONTROL,TAG_ENB jnz start_scb
+ /* Mark the current target as busy */
+ or ACTIVE_B,A
jmp start_scb
-# Place the currently active back on the queue for later processing
+/* Place the currently active SCB back on the queue for later processing */
requeue:
mov QINFIFO, SCBPTR
jmp poll_for_work
-# Pull the first entry off of the waiting for selection list
+/*
+ * Pull the first entry off of the waiting for selection list
+ * We don't have to "test_busy" because only transactions that
+ * have passed that test can be in the waiting_scb list.
+ */
start_waiting:
mov SCBPTR,WAITING_SCBH
- jmp start_scb
+ jmp start_scb2
test_a:
- test ACTIVE_A,A jnz requeue
- test SCBARRAY+0,TAG_ENB jnz start_scb
- or ACTIVE_A,A # Mark the current target as busy
+ test ACTIVE_A,A jnz requeue
+ test SCB_CONTROL,TAG_ENB jnz start_scb
+ /* Mark the current target as busy */
+ or ACTIVE_A,A
start_scb:
- and SINDEX,0xf7,SBLKCTL #Clear the channel select bit
- and A,0x08,SCBARRAY+1 #Get new channel bit
- or SINDEX,A
- mov SBLKCTL,SINDEX # select channel
- mov SCBARRAY+1 call initialize_scsiid
-
-# Enable selection phase as an initiator, and do automatic ATN
-# after the selection. We do this now so that we can overlap the
-# rest of our work to set up this target with the arbitration and
-# selection bus phases.
-#
-start_selection:
- or SCSISEQ,0x48 # ENSELO|ENAUTOATNO
+ mov SCB_NEXT_WAITING,WAITING_SCBH
mov WAITING_SCBH, SCBPTR
- and FLAGS,0x3f # !RESELECTING
+start_scb2:
+ and SINDEX,0xf7,SBLKCTL /* Clear the channel select bit */
+ and A,0x08,SCB_TCL /* Get new channel bit */
+ or SINDEX,A
+ mov SBLKCTL,SINDEX /* select channel */
+ mov SCB_TCL call initialize_scsiid
-# As soon as we get a successful selection, the target should go
-# into the message out phase since we have ATN asserted. Prepare
-# the message to send, locking out the device driver. If the device
-# driver hasn't beaten us with an ABORT or RESET message, then tack
-# on an SDTR negotiation if required.
-#
-# Messages are stored in scratch RAM starting with a flag byte (high bit
-# set means active message), one length byte, and then the message itself.
-#
-
- test SCBARRAY+11,0xff jnz identify # 0 Length Command?
-
-# The kernel has sent us an SCB with no command attached. This implies
-# that the kernel wants to send a message of some sort to this target,
-# so we interrupt the driver, allow it to fill the message buffer, and
-# then go back into the arbitration loop
+/*
+ * Enable selection phase as an initiator, and do automatic ATN
+ * after the selection. We do this now so that we can overlap the
+ * rest of our work to set up this target with the arbitration and
+ * selection bus phases.
+ */
+start_selection:
+ mvi SCSISEQ,0x58 /* ENSELO|ENAUTOATNO|ENRSELI */
+
+/*
+ * As soon as we get a successful selection, the target should go
+ * into the message out phase since we have ATN asserted. Prepare
+ * the message to send.
+ *
+ * Messages are stored in scratch RAM starting with a length byte
+ * followed by the message itself.
+ */
+ test SCB_CMDLEN,0xff jnz mk_identify /* 0 Length Command? */
+
+/*
+ * The kernel has sent us an SCB with no command attached. This implies
+ * that the kernel wants to send a message of some sort to this target,
+ * so we interrupt the driver, allow it to fill the message buffer, and
+ * then go back into the arbitration loop
+ */
mvi INTSTAT,AWAITING_MSG
jmp wait_for_selection
-identify:
- and A,DISCENB,SCBARRAY+0 # mask off disconnect privledge
-
- and SINDEX,0x7,SCBARRAY+1 # lun
- or SINDEX,A # or in disconnect privledge
- or SINDEX,0x80 call mk_mesg # IDENTIFY message
-
- mov A,SINDEX
- test SCBARRAY+0,0xb0 jz !message # WDTR, SDTR or TAG??
- cmp MSG_START+0,A jne !message # did driver beat us?
+mk_identify:
+ and A,DISCENB,SCB_CONTROL /* mask off disconnect privledge */
-# Tag Message if Tag enabled in SCB control block. Use SCBPTR as the tag
-# value
+ and MSG0,0x7,SCB_TCL /* lun */
+ or MSG0,A /* or in disconnect privledge */
+ or MSG0,MSG_IDENTIFY
+ mvi MSG_LEN, 1
+
+ test SCB_CONTROL,0xb0 jz !message /* WDTR, SDTR or TAG?? */
+/*
+ * Tag Message if Tag enabled in SCB control block. Use SCBPTR as the tag
+ * value
+ */
mk_tag:
- mvi DINDEX, MSG_START+1
- test SCBARRAY+0,TAG_ENB jz mk_tag_done
- and A,0x23,SCBARRAY+0
+ mvi DINDEX, MSG1
+ test SCB_CONTROL,TAG_ENB jz mk_tag_done
+ and A,0x23,SCB_CONTROL
mov DINDIR,A
mov DINDIR,SCBPTR
- add MSG_LEN,-MSG_START+0,DINDEX # update message length
+ add MSG_LEN,COMP_MSG0,DINDEX /* update message length */
mk_tag_done:
- mov DINDEX call mk_dtr # build DTR message if needed
+ test SCB_CONTROL,0x90 jz !message /* NEEDWDTR|NEEDSDTR */
+ mov DINDEX call mk_dtr /* build DTR message if needed */
!message:
wait_for_selection:
- test SSTAT0,SELDI jnz reselect
- test SSTAT0,SELDO jnz select
- jmp wait_for_selection
+ test SSTAT0,SELDO jnz select
+ test SSTAT0,SELDI jz wait_for_selection
-# Reselection has been initiated by a target. Make a note that we've been
-# reselected, but haven't seen an IDENTIFY message from the target
-# yet.
-#
+/*
+ * Reselection has been initiated by a target. Make a note that we've been
+ * reselected, but haven't seen an IDENTIFY message from the target
+ * yet.
+ */
reselect:
+ clr MSG_LEN /* Don't have anything in the mesg buffer */
mov SELID call initialize_scsiid
- and FLAGS,0x3f # reselected, no IDENTIFY
- or FLAGS,RESELECTED jmp select2
-
-# After the selection, remove this SCB from the "waiting for selection"
-# list. This is achieved by simply moving our "next" pointer into
-# WAITING_SCBH and setting our next pointer to null so that the next
-# time this SCB is used, we don't get confused.
-#
+ and FLAGS,0x03 /* clear target specific flags */
+ or FLAGS,RESELECTED
+ jmp select2
+
+/*
+ * After the selection, remove this SCB from the "waiting for selection"
+ * list. This is achieved by simply moving our "next" pointer into
+ * WAITING_SCBH. Our next pointer will be set to null the next time this
+ * SCB is used, so don't bother with it now.
+ */
select:
- or SCBARRAY+0,NEEDDMA
- mov WAITING_SCBH,SCBARRAY+30
- mvi SCBARRAY+30,SCB_LIST_NULL
+ and FLAGS,0x03 /* Clear target flags */
+ mov WAITING_SCBH,SCB_NEXT_WAITING
select2:
- call initialize_for_target
- mvi SCSISEQ,ENRSELI
- mvi CLRSINT0,0x60 # CLRSELDI|CLRSELDO
- mvi CLRSINT1,0x8 # CLRBUSFREE
-
-# Main loop for information transfer phases. If BSY is false, then
-# we have a bus free condition, expected or not. Otherwise, wait
-# for the target to assert REQ before checking MSG, C/D and I/O
-# for the bus phase.
-#
-# We can't simply look at the values of SCSISIGI here (if we want
-# to do synchronous data transfer), because the target won't assert
-# REQ if it's already sent us some data that we haven't acknowledged
-# yet.
-#
+/*
+ * Set CLRCHN here before the target has entered a data transfer mode -
+ * with synchronous SCSI, if you do it later, you blow away some
+ * data in the SCSI FIFO that the target has already sent to you.
+ */
+ or SXFRCTL0,CLRCHN
+/*
+ * Initialize SCSIRATE with the appropriate value for this target.
+ */
+ call ndx_dtr
+ mov SCSIRATE,SINDIR
+
+ mvi SCSISEQ,ENAUTOATNP /*
+ * ATN on parity errors
+ * for "in" phases
+ */
+ mvi CLRSINT1,CLRBUSFREE
+ mvi CLRSINT0,0x60 /* CLRSELDI|CLRSELDO */
+
+/*
+ * Main loop for information transfer phases. If BSY is false, then
+ * we have a bus free condition, expected or not. Otherwise, wait
+ * for the target to assert REQ before checking MSG, C/D and I/O
+ * for the bus phase.
+ *
+ */
ITloop:
- test SSTAT1,0x8 jnz p_busfree # BUSFREE
- test SSTAT1,0x1 jz ITloop # REQINIT
+ test SSTAT1,BUSFREE jnz p_busfree
+ test SSTAT1,REQINIT jz ITloop
- and A,0xe0,SCSISIGI # CDI|IOI|MSGI
+/*
+ * If we've had a parity error, let the driver know before
+ * we overwrite LASTPHASE.
+ */
+ test SSTAT1, SCSIPERR jz parity_okay
+ or CLRSINT1, CLRSCSIPERR
+ mvi INTSTAT, PARITY_ERROR
+
+parity_okay:
+ and A,PHASE_MASK,SCSISIGI
+ mov LASTPHASE,A
+ mov SCSISIGO,A
- mov A call scsisig
cmp ALLZEROS,A je p_dataout
- cmp A,0x40 je p_datain
- cmp A,0x80 je p_command
- cmp A,0xc0 je p_status
- cmp A,0xa0 je p_mesgout
- cmp A,0xe0 je p_mesgin
+ cmp A,P_DATAIN je p_datain
+ 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 INTSTAT,BAD_PHASE # unknown - signal driver
+ mvi INTSTAT,BAD_PHASE /* unknown phase - signal driver */
p_dataout:
- mvi DMAPARAMS,0x7d # WIDEODD|SCSIEN|SDMAEN|HDMAEN|
- # DIRECTION|FIFORESET
+ mvi DMAPARAMS,0x7d /*
+ * WIDEODD|SCSIEN|SDMAEN|HDMAEN|
+ * DIRECTION|FIFORESET
+ */
jmp data_phase_init
-# If we re-enter the data phase after going through another phase, the
-# STCNT may have been cleared, so restore it from the residual field.
+/*
+ * If we re-enter the data phase after going through another phase, the
+ * STCNT may have been cleared, so restore it from the residual field.
+ */
data_phase_reinit:
- mvi DINDEX, STCNT
- mvi SCBARRAY+15 call bcopy_3
+ mov STCNT0,SCB_RESID_DCNT0
+ mov STCNT1,SCB_RESID_DCNT1
+ mov STCNT2,SCB_RESID_DCNT2
jmp data_phase_loop
-# Reads should not use WIDEODD since it may make the last byte for a SG segment
-# go to the next segment.
p_datain:
- mvi DMAPARAMS,0x79 # WIDEODD|SCSIEN|SDMAEN|HDMAEN|
- # !DIRECTION|FIFORESET
+ mvi DMAPARAMS,0x79 /*
+ * WIDEODD|SCSIEN|SDMAEN|HDMAEN|
+ * !DIRECTION|FIFORESET
+ */
data_phase_init:
call assert
test FLAGS, DPHASE jnz data_phase_reinit
call sg_scb2ram
- or FLAGS, DPHASE # We have seen a data phase
+ or FLAGS, DPHASE /* We have seen a data phase */
data_phase_loop:
-# If we are the last SG block, don't set wideodd.
+/* If we are the last SG block, don't set wideodd. */
cmp SG_COUNT,0x01 jne data_phase_wideodd
- and DMAPARAMS, 0xbf # Turn off WIDEODD
+ and DMAPARAMS, 0xbf /* Turn off WIDEODD */
data_phase_wideodd:
mov DMAPARAMS call dma
-# Exit if we had an underrun
- test SSTAT0,0x04 jz data_phase_finish # underrun STCNT != 0
+/* Exit if we had an underrun */
+ test SSTAT0,SDONE jz data_phase_finish /* underrun STCNT != 0 */
-# Advance the scatter-gather pointers if needed
-#
+/*
+ * Advance the scatter-gather pointers if needed
+ */
sg_advance:
- dec SG_COUNT # one less segment to go
+ dec SG_COUNT /* one less segment to go */
- test SG_COUNT, 0xff jz data_phase_finish #Are we done?
+ test SG_COUNT, 0xff jz data_phase_finish /* Are we done? */
- clr A # add sizeof(struct scatter)
- add SG_NEXT+0,SG_SIZEOF,SG_NEXT+0
- adc SG_NEXT+1,A,SG_NEXT+1
- adc SG_NEXT+2,A,SG_NEXT+2
- adc SG_NEXT+3,A,SG_NEXT+3
-
-# Load a struct scatter and set up the data address and length.
-# If the working value of the SG count is nonzero, then
-# we need to load a new set of values.
-#
-# This, like all DMA's, assumes a little-endian host data storage.
-#
+ clr A /* add sizeof(struct scatter) */
+ add SG_NEXT0,SG_SIZEOF,SG_NEXT0
+ adc SG_NEXT1,A,SG_NEXT1
+
+/*
+ * Load a struct scatter and set up the data address and length.
+ * If the working value of the SG count is nonzero, then
+ * we need to load a new set of values.
+ *
+ * This, like all DMA's, assumes a little-endian host data storage.
+ */
sg_load:
- clr HCNT+2
- clr HCNT+1
- mvi HCNT+0,SG_SIZEOF
-
- mvi DINDEX,HADDR
- mvi SG_NEXT call bcopy_4
-
- mvi DFCNTRL,0xd # HDMAEN|DIRECTION|FIFORESET
-
-# Wait for DMA from host memory to data FIFO to complete, then disable
-# DMA and wait for it to acknowledge that it's off.
-#
- call dma_finish
-
-# Copy data from FIFO into SCB data pointer and data count. This assumes
-# that the struct scatterlist has this structure (this and sizeof(struct
-# scatterlist) == 12 are asserted in aic7xxx.c):
-#
-# struct scatterlist {
-# char *address; /* four bytes, little-endian order */
-# ... /* four bytes, ignored */
-# unsigned short length; /* two bytes, little-endian order */
-# }
-#
-
-# Not in FreeBSD. the scatter list entry is only 8 bytes.
-#
-# struct ahc_dma_seg {
-# physaddr addr; /* four bytes, little-endian order */
-# long len; /* four bytes, little endian order */
-# };
-#
-
- mvi DINDEX,HADDR
-# call bcopy_7_dfdat
-
-# For Linux, we must throw away four bytes since there is a 32bit gap
-# in the middle of a struct scatterlist
- call bcopy_4_dfdat
+ clr HCNT2
+ clr HCNT1
+ mvi HCNT0,SG_SIZEOF
+
+ mov HADDR0,SG_NEXT0
+ mov HADDR1,SG_NEXT1
+ mov HADDR2,SG_NEXT2
+ mov HADDR3,SG_NEXT3
+
+ or DFCNTRL,0xd /* HDMAEN|DIRECTION|FIFORESET */
+
+/*
+ * 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
+ /* Turn off DMA preserving WIDEODD */
+ and DFCNTRL,WIDEODD
+dma_finish2:
+ test DFCNTRL,HDMAENACK jnz dma_finish2
+
+/*
+ * Copy data from FIFO into SCB data pointer and data count. This assumes
+ * that the struct scatterlist has this structure (this and sizeof(struct
+ * scatterlist) == 12 are asserted in aic7xxx.c):
+ *
+ * struct scatterlist {
+ * char *address; four bytes, little-endian order
+ * ... four bytes, ignored
+ * unsigned short length; two bytes, little-endian order
+ * }
+ *
+ *
+ * Not in FreeBSD. the scatter list entry is only 8 bytes.
+ *
+ * struct ahc_dma_seg {
+ * physaddr addr; four bytes, little-endian order
+ * long len; four bytes, little endian order
+ * };
+ */
+
+/*
+ * For Linux, we must throw away four bytes since there is a 32bit gap
+ * in the middle of a struct scatterlist
+ */
+#ifdef linux
+ mov HADDR0,DFDAT
+ mov HADDR1,DFDAT
+ mov HADDR2,DFDAT
+ mov HADDR3,DFDAT
mov NONE,DFDAT
mov NONE,DFDAT
mov NONE,DFDAT
mov NONE,DFDAT
- call bcopy_3_dfdat #Only support 24 bit length.
-
-# Load STCNT as well. It is a mirror of HCNT
- mvi DINDEX,STCNT
- mvi HCNT call bcopy_3
+ mov HCNT0,DFDAT
+ mov HCNT1,DFDAT
+ mov HCNT2,DFDAT
+#else
+/*
+ * For FreeBSD, just copy it wholesale
+ */
+ mov HADDR0,DFDAT
+ mov HADDR1,DFDAT
+ mov HADDR2,DFDAT
+ mov HADDR3,DFDAT
+ mov HCNT0,DFDAT
+ mov HCNT1,DFDAT
+ mov HCNT2,DFDAT
+#endif
+
+/* Load STCNT as well. It is a mirror of HCNT */
+ mov STCNT0,HCNT0
+ mov STCNT1,HCNT1
+ mov STCNT2,HCNT2
test SSTAT1,PHASEMIS jz data_phase_loop
data_phase_finish:
-# 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.
-#
- mvi DINDEX,SCBARRAY+15
- mvi STCNT call bcopy_3
- mov SCBARRAY+18, SG_COUNT
+/*
+ * 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.
+ */
+ mov SCB_RESID_DCNT0,STCNT0
+ mov SCB_RESID_DCNT1,STCNT1
+ mov SCB_RESID_DCNT2,STCNT2
+ mov SCB_RESID_SGCNT, SG_COUNT
jmp ITloop
-# Command phase. Set up the DMA registers and let 'er rip - the
-# two bytes after the SCB SCSI_cmd_length are zeroed by the driver,
-# so we can copy those three bytes directly into HCNT.
-#
+/*
+ * Command phase. Set up the DMA registers and let 'er rip - the
+ * two bytes after the SCB SCSI_cmd_length are zeroed by the driver,
+ * so we can copy those three bytes directly into HCNT.
+ */
p_command:
call assert
-# Load HADDR and HCNT. We can do this in one bcopy since they are neighbors
- mvi DINDEX,HADDR
- mvi SCBARRAY+7 call bcopy_7
-
- mvi DINDEX,STCNT
- mvi SCBARRAY+11 call bcopy_3
+/*
+ * Load HADDR and HCNT. We can do this in one bcopy since they are neighbors
+ */
+ mov HADDR0, SCB_CMDPTR0
+ mov HADDR1, SCB_CMDPTR1
+ mov HADDR2, SCB_CMDPTR2
+ mov HADDR3, SCB_CMDPTR3
+ mov HCNT0, SCB_CMDLEN
+ clr HCNT1
+ clr HCNT2
+
+ mov STCNT0, HCNT0
+ mov STCNT1, HCNT1
+ mov STCNT2, HCNT2
mvi 0x3d call dma # SCSIEN|SDMAEN|HDMAEN|
# DIRECTION|FIFORESET
jmp ITloop
-# Status phase. Wait for the data byte to appear, then read it
-# and store it into the SCB.
-#
+/*
+ * Status phase. Wait for the data byte to appear, then read it
+ * and store it into the SCB.
+ */
p_status:
-
- mvi SCBARRAY+14 call inb_first
+ mvi SCB_TARGET_STATUS call inb_first
jmp mesgin_done
-# Message out phase. If there is no active message, but the target
-# took us into this phase anyway, build a no-op message and send it.
-#
+/*
+ * Message out phase. If there is no active message, but the target
+ * took us into this phase anyway, build a no-op message and send it.
+ */
p_mesgout:
- mvi 0x8 call mk_mesg # build NOP message
+ test MSG_LEN, 0xff jnz p_mesgout_start
+ mvi MSG_NOP call mk_mesg /* build NOP message */
- clr STCNT+2
- clr STCNT+1
-
-# Set up automatic PIO transfer from MSG_START. Bit 3 in
-# SXFRCTL0 (SPIOEN) is already on.
-#
- mvi SINDEX,MSG_START+0
+p_mesgout_start:
+/*
+ * Set up automatic PIO transfer from MSG0. Bit 3 in
+ * SXFRCTL0 (SPIOEN) is already on.
+ */
+ 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.
-# (We can't use outb for this since it wants the input in SINDEX.)
-#
-# Keep an eye out for a phase change, in case the target issues
-# a MESSAGE REJECT.
-#
-p_mesgout2:
- test SSTAT0,0x2 jz p_mesgout2 # SPIORDY
- test SSTAT1,0x10 jnz p_mesgout6 # PHASEMIS
-
- cmp DINDEX,1 jne p_mesgout3 # last byte?
- mvi CLRSINT1,0x40 # CLRATNO - drop ATN
-
-# Write a byte to the SCSI bus. The AIC-7770 refuses to automatically
-# send ACKs in automatic PIO or DMA mode unless you make sure that the
-# "expected" bus phase in SCSISIGO matches the actual bus phase. This
-# behaviour is completely undocumented and caused me several days of
-# grief.
-#
-# After plugging in different drives to test with and using a longer
-# SCSI cable, I found that I/O in Automatic PIO mode ceased to function,
-# especially when transferring >1 byte. It seems to be much more stable
-# if STCNT is set to one before the transfer, and SDONE (in SSTAT0) is
-# polled for transfer completion - for both output _and_ input. The
-# only theory I have is that SPIORDY doesn't drop right away when SCSIDATL
-# is accessed (like the documentation says it does), and that on a longer
-# cable run, the sequencer code was fast enough to loop back and see
-# an SPIORDY that hadn't dropped yet.
-#
-p_mesgout3:
- mvi STCNT+0, 0x01
+/*
+ * 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:
+ dec DINDEX
+ or CLRSINT0, CLRSPIORDY
mov SCSIDATL,SINDIR
-
+
p_mesgout4:
- test SSTAT0,0x4 jz p_mesgout4 # SDONE
- dec DINDEX
- test DINDEX,0xff jnz p_mesgout2
+ 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_mesgout5:
- test SSTAT1,0x8 jnz p_mesgout6 # BUSFREE
- test SSTAT1,0x1 jz p_mesgout5 # REQINIT
-
- and A,0xe0,SCSISIGI # CDI|IOI|MSGI
- cmp A,0xa0 jne p_mesgout6
- or SINDEX,0x10,SIGSTATE # turn on ATNO
- call scsisig # ATNO - re-assert ATN
+/*
+ * 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 SCSISIGO,ATNO /* turn on ATNO */
jmp ITloop
-p_mesgout6:
- mvi CLRSINT1,0x40 # CLRATNO - in case of PHASEMIS
- and FLAGS,0xdf # no active msg
+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, but not
-# using inb. This alleviates a race condition, namely that if ATN had
-# to be asserted under Automatic PIO mode, it had to beat the SCSI
-# circuitry sending an ACK to the target. This showed up under heavy
-# loads and really confused things, since ABORT commands wouldn't be
-# seen by the drive after an IDENTIFY message in until it had changed
-# to a data I/O phase.
-#
+/*
+ * Message in phase. Bytes are read using Automatic PIO mode.
+ */
p_mesgin:
- mvi A call inb_first # read the 1st message byte
- mvi REJBYTE,A # save it for the driver
+ mvi A call inb_first /* read the 1st message byte */
+ mov REJBYTE,A /* save it for the driver */
- test A,0x80 jnz mesgin_identify # identify message?
- cmp A,4 je mesgin_disconnect # disconnect?
- cmp A,2 je mesgin_sdptrs # save data pointers?
- cmp ALLZEROS,A je mesgin_complete # command complete?
- cmp A,3 je mesgin_rdptrs # restore pointers code?
- cmp A,1 je mesgin_extended # extended message?
- cmp A,7 je mesgin_reject # message reject code?
+ 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
+/*
+ * 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 SCSISIGO,ATNO /* turn on ATNO */
+ mvi INTSTAT,SEND_REJECT /* let driver know */
- mvi 0x7 call mk_mesg # MESSAGE REJECT message
+ mvi MSG_REJECT call mk_mesg
mesgin_done:
- call inb_last # ack & turn auto PIO back on
+ 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 SCBARRAY+18,0xff jnz resid
+/*
+ * We got a "command complete" message, so put the SCB pointer
+ * into QUEUEOUT, 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 SCBARRAY+14,0xff jz status_ok # 0 Status?
- mvi INTSTAT,BAD_STATUS # let driver know
- test RETURN_1, 0x80 jz status_ok
+ 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 SCBARRAY+0,TAG_ENB jnz complete # Tagged command
- and FUNCTION1,0x70,SCBARRAY+1
+/* 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 SCBARRAY+1,0x88 jz clear_a
+ test SCB_TCL,0x88 jz clear_a
xor ACTIVE_B,A
- jmp immediate
+ jmp test_immediate
clear_a:
xor ACTIVE_A,A
-immediate:
- test SCBARRAY+11,0xff 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.
+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 poll_for_work
+ jmp start
complete:
mov QOUTFIFO,SCBPTR
mvi INTSTAT,CMDCMPLT
jmp mesgin_done
-# 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, but a ton of instructions), or
-# have the sequencer pause itself when it encounters a non-zero resid
-# (unecessary pause just to flag the command -- yuck, but takes few instructions
-# and since it shouldn't happen that often is good enough for our purposes).
-
-resid:
- mvi INTSTAT,RESIDUAL
- jmp check_status
-# 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.
-#
+/*
+ * 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
+ mvi ARG_1 call inb_next /* extended message length */
+ mvi A call inb_next /* extended message code */
- cmp A,1 je p_mesginSDTR # Syncronous negotiation message
- cmp A,3 je p_mesginWDTR # Wide negotiation message
+ 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 A call inb_next # Width of bus
- mvi INTSTAT,MSG_WDTR # let driver know
- test RETURN_1,0x80 jz mesgin_done# Do we need to send WDTR?
-
-# We didn't initiate the wide negotiation, so we must respond to the request
- and RETURN_1,0x7f # Clear the SEND_WDTR Flag
- or FLAGS,ACTIVE_MSG
- mvi DINDEX,MSG_START+0
- mvi MSG_START+0 call mk_wdtr # build WDTR message
- or SINDEX,0x10,SIGSTATE # turn on ATNO
- call scsisig
+ 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 SCSISIGO,ATNO /* turn on ATNO */
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,MSG_SDTR # call driver to convert
-
- test RETURN_1,0xc0 jz mesgin_done# Do we need to mk_sdtr or rej?
- test RETURN_1,0x40 jnz rej_mesgin # Requested SDTR too small - rej
- or FLAGS,ACTIVE_MSG
- mvi DINDEX, MSG_START+0
- mvi MSG_START+0 call mk_sdtr
- or SINDEX,0x10,SIGSTATE # turn on ATNO
- call scsisig
+ 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 SCSISIGO,ATNO /* turn on ATNO */
jmp mesgin_done
-# Is it a disconnect message? Set a flag in the SCB to remind us
-# and await the bus going free.
-#
+/*
+ * Is it a disconnect message? Set a flag in the SCB to remind us
+ * and await the bus going free.
+ */
mesgin_disconnect:
- or SCBARRAY+0,DISCONNECTED
+ or SCB_CONTROL,DISCONNECTED
jmp mesgin_done
-# Save data pointers message? Copy working values into the SCB,
-# usually in preparation for a disconnect.
-#
+/*
+ * 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.
-#
+/*
+ * 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
+ 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.
-#
+/*
+ * 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
+ test A,0x78 jnz rej_mesgin /*!DiscPriv|!LUNTAR|!Reserved*/
- and A,0x07 # lun in lower three bits
+ and A,0x07 /* lun in lower three bits */
or SAVED_TCL,A,SELID
and SAVED_TCL,0xf7
- and A,0x08,SBLKCTL # B Channel??
+ and A,SELBUSB,SBLKCTL /* B Channel?? */
or SAVED_TCL,A
- call inb_last # ACK
- mov ALLZEROS call findSCB
-setup_SCB:
- and SCBARRAY+0,0xfb # clear disconnect bit in SCB
- or FLAGS,IDENTIFY_SEEN # make note of IDENTIFY
+ 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 A call inb_first
- cmp A,0x20 jne return # Simple Tag message?
- mvi A call inb_next
- call inb_last
- test A,0xf0 jnz abort_tag # Tag in range?
- mov SCBPTR,A
+ 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 a SCB transaction
+ * to the reconnecting target.
+ */
+ mov SCBPTR,ARG_1
mov A,SAVED_TCL
- cmp SCBARRAY+1,A jne abort_tag
- test SCBARRAY+0,TAG_ENB jz abort_tag
- ret
+ 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
- ret
+ or SCSISIGO,ATNO /* turn on ATNO */
+ 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.
-#
+/*
+ * 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, MSG_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.
-#
+/*
+ * [ 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 CLRSINT1,0x40 # CLRATNO
- clr SIGSTATE
+ mvi CLRSINT1,CLRATNO
-# if this is an immediate command, perform a psuedo command complete to
-# notify the driver.
- test SCBARRAY+11,0xff jz status_ok
- jmp poll_for_work
-
-# 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.
+/*
+ * if this is an immediate command, perform a psuedo command complete to
+ * notify the driver.
+ */
+ test SCB_CMDLEN,0xff jz status_ok
+ jmp start
+
+#if 0
+/*
+ * 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
@@ -913,166 +803,134 @@
mov DINDIR,SINDIR
mov DINDIR,SINDIR
mov DINDIR,SINDIR ret
+#endif
-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.
-#
+/*
+ * 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 FLAGS,ACTIVE_MSG jnz mk_mesg1 # active message?
-
- or FLAGS,ACTIVE_MSG # if not, there is now
- mvi MSG_LEN,1 # length = 1
- mov MSG_START+0,SINDEX # 1-byte message
+ 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
mk_mesg1:
- mvi SEQCTL,0x10 ret # !PAUSEDIS|FASTMODE
+ 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.
+ */
-# Carefully read data in Automatic PIO mode. I first tried this using
-# Manual PIO mode, but it gave me continual underrun errors, probably
-# indicating that I did something wrong, but I feel more secure leaving
-# Automatic PIO on all the time.
-#
-# 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:
+ or CLRSINT0, CLRSPIORDY
+ mov NONE,SCSIDATL /*dummy read from latch to ACK*/
+inb_next_wait:
+ test SSTAT1,PHASEMIS jnz mesgin_phasemis
+ test SSTAT0,SPIORDY jz inb_next_wait /* wait for next byte */
inb_first:
- clr STCNT+2
- clr STCNT+1
mov DINDEX,SINDEX
- mov DINDIR,SCSIBUSL ret # read byte directly from bus
-
-inb_next:
- mov DINDEX,SINDEX # save SINDEX
-
- mvi STCNT+0,1 # xfer one byte
- mov NONE,SCSIDATL # dummy read from latch to ACK
-inb_next1:
- test SSTAT0,0x4 jz inb_next1 # SDONE
-inb_next2:
- test SSTAT0,0x2 jz inb_next2 # SPIORDY - wait for next byte
- mov DINDIR,SCSIBUSL ret # read byte directly from bus
-
+ mov DINDIR,SCSIBUSL ret /*read byte directly from bus*/
inb_last:
- mvi STCNT+0,1 # ACK with dummy read
- mov NONE,SCSIDATL
-inb_last1:
- test SSTAT0,0x4 jz inb_last1 # wait for completion
- ret
+ mov NONE,SCSIDATL ret /*dummy read from latch to ACK*/
-# 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.
-#
+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 SSTAT0,0x1 jnz dma3 # DMADONE
- test SSTAT1,0x10 jz dma1 # PHASEMIS, ie. underrun
+ 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.
-#
+/*
+ * 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,0x4 jnz dma5 # DIRECTION
+ test SINDEX,DIRECTION jnz dma5
dma4:
- test DFSTATUS,0x1 jz dma4 # !FIFOEMP
+ 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.
-#
+/*
+ * Now shut the DMA enables off and make sure that the DMA enables are
+ * actually off first lest we get an ILLSADDR.
+ */
dma5:
- and DFCNTRL, 0x40, SINDEX # disable DMA, but maintain
- # WIDEODD
+ /* disable DMA, but maintain WIDEODD */
+ and DFCNTRL,WIDEODD
dma6:
- test DFCNTRL,0x38 jnz dma6 # SCSIENACK|SDMAENACK|HDMAENACK
-
- ret
+ test DFCNTRL,0x38 jnz dma6 /* SCSIENACK|SDMAENACK|HDMAENACK */
-dma_finish:
- test DFSTATUS,0x8 jz dma_finish # HDONE
-
- clr DFCNTRL # disable DMA
-dma_finish2:
- test DFCNTRL,0x8 jnz dma_finish2 # HDMAENACK
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.
-#
+/*
+ * 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 SINDEX,0xf0 /* Get target ID */
and A,0x0f,SCSIID
or SINDEX,A
mov SCSIID,SINDEX ret
-initialize_for_target:
-# Turn on Automatic PIO mode now, before we expect to see a REQ
-# from the target. It shouldn't hurt anything to leave it on. Set
-# CLRCHN here before the target has entered a data transfer mode -
-# with synchronous SCSI, if you do it later, you blow away some
-# data in the SCSI FIFO that the target has already sent to you.
-#
- clr SIGSTATE
-
- or SXFRCTL0,0x8a # DFON|SPIOEN|CLRCHN
-
-# Make sure that the system knows we have not been through a DATA
-# phase.
- and FLAGS, 0xfb # !DPHASE
-
-# Initialize SCSIRATE with the appropriate value for this target.
-#
- call ndx_dtr
- mov SCSIRATE,SINDIR ret
-
-# Assert that if we've been reselected, then we've seen an IDENTIFY
-# message.
-#
+/*
+ * 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?
+ test FLAGS,RESELECTED jz return /* reselected? */
+ test FLAGS,IDENTIFY_SEEN jnz return /* seen IDENTIFY? */
- mvi INTSTAT,NO_IDENT ret # no - cause a kernel panic
+ 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.
-#
+/*
+ * 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 SCBARRAY+1,A jne findSCB1 # target ID/channel/lun match?
- test SCBARRAY+0,DISCONNECTED jz findSCB1 # should be disconnected
- test SCBARRAY+0,TAG_ENB jnz get_tag
+ 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:
@@ -1080,130 +938,135 @@
mov A,SCBCOUNT
cmp SINDEX,A jne findSCB
- mvi INTSTAT,NO_MATCH # not found - signal kernel
- mvi 0x6 call mk_mesg # ABORT message
+ 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
+ or SCSISIGO,ATNO ret /* assert ATNO */
-# Make a working copy of the scatter-gather parameters from the SCB.
-#
+/*
+ * Make a working copy of the scatter-gather parameters from the SCB.
+ */
sg_scb2ram:
- mvi DINDEX,HADDR
- mvi SCBARRAY+19 call bcopy_7
-
- mvi DINDEX,STCNT
- mvi SCBARRAY+23 call bcopy_3
-
- mov SG_COUNT,SCBARRAY+2
-
- mvi DINDEX,SG_NEXT
- mvi SCBARRAY+3 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.
-#
+ mov HADDR0, SCB_DATAPTR0
+ mov HADDR1, SCB_DATAPTR1
+ mov HADDR2, SCB_DATAPTR2
+ mov HADDR3, SCB_DATAPTR3
+ mov HCNT0, SCB_DATACNT0
+ mov HCNT1, SCB_DATACNT1
+ mov HCNT2, SCB_DATACNT2
+
+ mov STCNT0, HCNT0
+ mov STCNT1, HCNT1
+ mov STCNT2, HCNT2
+
+ mov SG_COUNT,SCB_SGCOUNT
+
+ mov SG_NEXT0, SCB_SGPTR0
+ mov SG_NEXT1, SCB_SGPTR1
+ mov SG_NEXT2, SCB_SGPTR2
+ mov SG_NEXT3, SCB_SGPTR3 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 SCBARRAY+2,SG_COUNT
+ mov SCB_SGCOUNT,SG_COUNT
- mvi DINDEX,SCBARRAY+3
- mvi SG_NEXT call bcopy_4
+ mov SCB_SGPTR0,SG_NEXT0
+ mov SCB_SGPTR1,SG_NEXT1
+ mov SCB_SGPTR2,SG_NEXT2
+ mov SCB_SGPTR3,SG_NEXT3
- mvi DINDEX,SCBARRAY+19
- mvi SHADDR call bcopy_4
-
-# Use the residual number since STCNT is corrupted by any message transfer
- mvi SCBARRAY+15 call bcopy_3
- ret
-
-# Add the array base SYNCNEG 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.
-#
+ mov SCB_DATAPTR0,SHADDR0
+ mov SCB_DATAPTR1,SHADDR1
+ mov SCB_DATAPTR2,SHADDR2
+ mov SCB_DATAPTR3,SHADDR3
+
+/*
+ * Use the residual number since STCNT is corrupted by any message transfer
+ */
+ mov SCB_DATACNT0,SCB_RESID_DCNT0
+ mov SCB_DATACNT1,SCB_RESID_DCNT1
+ mov SCB_DATACNT2,SCB_RESID_DCNT2 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,0x08 jz ndx_dtr_2
- or A,0x08 # Channel B entries add 8
+ test SBLKCTL,SELBUSB jz ndx_dtr_2
+ or A,0x08 /* Channel B entries add 8 */
ndx_dtr_2:
- add SINDEX,SYNCNEG,A
-
- and FUNCTION1,0x70,SCSIID # 3-bit target address decode
- mov A,FUNCTION1 ret
+ add SINDEX,TARG_SCRATCH,A 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.
-#
+/*
+ * 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 SCBARRAY+0,0x90 jz return # NEEDWDTR|NEEDSDTR
- test SCBARRAY+0,NEEDWDTR jnz mk_wdtr_16bit
- or FLAGS, MAX_OFFSET # Force an offset of 15 or 8 if WIDE
+ 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
+ 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, MAX_OFFSET jnz mk_sdtr_max_offset
- and DINDIR,0x0f,SINDIR # Sync Offset
+ 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,-MSG_START+0,DINDEX ret # update message length
+ 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, MAX_OFFSET
- test SCSIRATE, 0x80 jnz wmax_offset # Talking to a WIDE device?
+/*
+ * 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_WIDE
+ 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
+ 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,-MSG_START+0,DINDEX ret # update message length
+ 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
+ call ndx_dtr /* index scratch space for target */
shr A,SINDIR,0x4
- dec SINDEX #Preserve SINDEX
+ dec SINDEX /* Preserve SINDEX */
and A,0x7
clr RETURN_1
sdtr_to_rate_loop:
test A,0x0f jz sdtr_to_rate_done
- add RETURN_1,0x18
+ add RETURN_1,0x19
dec A
jmp sdtr_to_rate_loop
sdtr_to_rate_done:
shr RETURN_1,0x2
- add RETURN_1,0x18
+ add RETURN_1,0x19
test SXFRCTL0,ULTRAEN jz return
shr RETURN_1,0x1
return:
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen, slshen@lbl.gov
with Sam's (original) version of this