Full support for 294x and Wide devices. Fixed month old bug in the SCSI

sense retrieval code that messed up CDROM devices.  This code will also
responde correctly to SDTR and WDTR messages from devices that start a
negotiation sequence.
This commit is contained in:
Justin T. Gibbs 1995-01-13 02:22:11 +00:00
parent 985649bb94
commit 20c5e65572
Notes: svn2git 2020-12-20 02:59:44 +00:00
svn path=/head/; revision=5562
2 changed files with 350 additions and 166 deletions

View File

@ -1,6 +1,6 @@
# @(#)aic7xxx.seq 1.31 94/11/25 jda
# @(#)aic7xxx.seq 1.32 94/11/29 jda
#
# Adaptec 274x device driver for Linux.
# Adaptec 274x/284x/294x device driver for Linux.
# Copyright (c) 1994 The University of Calgary Department of Computer Science.
#
# This program is free software; you can redistribute it and/or modify
@ -17,7 +17,7 @@
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
VERSION AIC7XXX_SEQ_VERSION 1.31
VERSION AIC7XXX_SEQ_VERSION 1.32
SCBMASK = 0x1f
@ -97,6 +97,7 @@ SIGNAL_2 = 0x21 # no IDENTIFY after reconnect
SIGNAL_3 = 0x31 # no cmd match for reconnect
SIGNAL_4 = 0x41 # SDTR -> SCSIRATE conversion
STATUS_ERROR = 0x51
SIGNAL_WDTR = 0x61
# 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
@ -116,7 +117,7 @@ STATUS_ERROR = 0x51
# message, so the driver can report an intelligible error if a message is
# rejected.
#
# RESELECT's high bit is true if we are currently handling a reselect;
# 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
@ -131,9 +132,10 @@ DROPATN = 0x30
REJBYTE = 0x31
DISC_DSB_A = 0x32
DISC_DSB_B = 0x33
RESELECT = 0x34
MSG_FLAGS = 0x35
NEEDWDTR_A = 0x34
NEEDWDTR_B = 0x35
MSG_LEN = 0x36
MSG_START+0 = 0x37
MSG_START+1 = 0x38
@ -163,6 +165,11 @@ SCBCOUNT = 0x56 # the actual number of SCBs
FLAGS = 0x57 # Device configuration flags
TWIN_BUS = 0x01
WIDE_BUS = 0x02
CHECK_DTR = 0x08
SENSE = 0x10
ACTIVE_MSG = 0x20
IDENTIFY_SEEN = 0x40
RESELECTED = 0x80
ACTIVE_A = 0x58
ACTIVE_B = 0x59
@ -171,6 +178,7 @@ ACTIVE_B = 0x59
# the number of entries in the Queue In FIFO.
#
start:
test FLAGS,SENSE jnz start_sense
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.
@ -205,6 +213,11 @@ start2:
or ACTIVE_B,A # Mark the current target as busy
jmp start_scb
start_sense:
# Clear the SENSE flag first, then do a normal start_scb
and FLAGS,0xef
jmp start_scb
# Place the currently active back on the queue for later processing
requeue:
mov QINFIFO, SCBPTR
@ -215,11 +228,13 @@ test_a:
or ACTIVE_A,A # Mark the current target as busy
start_scb:
and A,0x08,SCBARRAY+1
mov SBLKCTL,A # select channel, !wide
and SINDEX,0x08,SCBARRAY+1
and A,WIDE_BUS,FLAGS # Wide bus?
or SINDEX,A
mov SBLKCTL,SINDEX # select channel, bus width
mov SCBARRAY+1 call initialize
clr SG_NOLOAD
clr RESELECT
and FLAGS,0x3f # !RESELECTING
# As soon as we get a successful selection, the target should go
# into the message out phase since we have ATN asserted. Prepare
@ -238,7 +253,8 @@ start_scb:
mov A,SINDEX
cmp MSG_START+0,A jne !message # did driver beat us?
mvi MSG_START+1 call mk_sdtr # build SDTR message if needed
test FLAGS,CHECK_DTR jz !message # Don't even bother with DTR?
mvi MSG_START+1 call mk_dtr # build DTR message if needed
!message:
@ -286,7 +302,8 @@ reselect1:
test SSTAT0,0x20 jz reselect1 # SELDI
mov SELID call initialize
mvi RESELECT,0x80 # reselected, no IDENTIFY
and FLAGS,0x3f # reselected, no IDENTIFY
or FLAGS,RESELECTED
# After the [re]selection, make sure that the [re]selection enable
# bit is off. This chip is flaky enough without extra things
@ -495,7 +512,7 @@ p_mesgout5:
p_mesgout6:
mvi CLRSINT1,0x40 # CLRATNO - in case of PHASEMIS
clr MSG_FLAGS # no active msg
and FLAGS,0xdf # no active msg
jmp ITloop
# Message in phase. Bytes are read using Automatic PIO mode, but not
@ -528,9 +545,9 @@ p_mesgin:
# before the command complete code tried processing it.
test SCBARRAY+14,0xff jz status_ok # 0 Status?
call inb_last # ack & turn auto PIO back on
mvi INTSTAT,STATUS_ERROR # let driver know
jmp start_scb
test FLAGS,SENSE jz status_ok
jmp p_mesgin_done
status_ok:
@ -549,50 +566,48 @@ complete:
mvi INTSTAT,0x02 # CMDCMPLT
jmp p_mesgin_done
# Is it an extended message? We only support the synchronous data
# transfer request message, which will probably be in response to
# an SDTR message out from us. If it's not an SDTR, reject it -
# 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.
#
# XXX - we should really reject this if we didn't initiate the SDTR
# negotiation; this may cause problems with unusual devices.
#
p_mesgin1:
cmp A,1 jne p_mesgin2 # extended message code?
mvi A call inb_next
cmp A,3 jne p_mesginN # extended mesg length = 3
mvi A call inb_next
cmp A,1 jne p_mesginN # SDTR 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
jmp p_mesginN
p_mesginWDTR:
cmp ARG_1,2 jne p_mesginN # extended mesg length = 2
mvi A call inb_next # Width of bus
mvi INTSTAT,SIGNAL_WDTR # let driver know
test RETURN_1,0x80 jz p_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 MSG_START+0 call mk_wdtr # build WDTR message
or SINDEX,0x10,SIGSTATE # turn on ATNO
call scsisig
jmp p_mesgin_done
p_mesginSDTR:
cmp ARG_1,3 jne p_mesginN # extended mesg length = 3
mvi ARG_1 call inb_next # xfer period
mvi A call inb_next # REQ/ACK offset
mvi INTSTAT,SIGNAL_4 # call driver to convert
call ndx_sdtr # index sync config for target
mov DINDEX,SINDEX
not A # turn off "need sdtr" flag
test SBLKCTL,0x08 jnz p_mesgin1_b
test SCSIID,0x80 jnz p_mesgin1_b
and NEEDSDTR_A,A
jmp p_mesgin1_save
test RETURN_1,0x80 jz p_mesgin_done# Do we need to mk_sdtr?
p_mesgin1_b:
and NEEDSDTR_B,A
p_mesgin1_save:
and A,0x80,SINDIR # get the WIDEXFER flag
or RETURN_1,A # Set WIDEXFER if necessary
mov DINDIR,RETURN_1 # save returned value
# Even though the SCSI-2 specification says that a device responding
# to our SDTR message should honor our parameters for transmitting
# to us, it doesn't seem to work too well in real life. In particular,
# a lot of CD-ROM and tape units don't function: try using the SDTR
# parameters the device sent us for both transmitting and receiving.
#
mov SCSIRATE,RETURN_1
or FLAGS,ACTIVE_MSG
mvi MSG_START+0 call mk_sdtr
or SINDEX,0x10,SIGSTATE # turn on ATNO
call scsisig
jmp p_mesgin_done
# Is it a disconnect message? Set a flag in the SCB to remind us
@ -638,17 +653,17 @@ p_mesgin5:
# or the driver is trying to abort the command. Either way, something
# untoward has happened and we should just leave it alone.
#
test MSG_FLAGS,0x80 jnz p_mesgin_done
test FLAGS,ACTIVE_MSG jnz p_mesgin_done
and SCBARRAY+0,0xfb # clear disconnect bit in SCB
mvi RESELECT,0xc0 # make note of IDENTIFY
or FLAGS,0xc0 # make note of IDENTIFY
call sg_scb2ram # implied restore pointers
# required on reselect
jmp p_mesgin_done
# Message reject? If we have an outstanding SDTR negotiation, assume
# that it's a response from the target selecting asynchronous transfer,
# Message reject? 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.
#
# XXX - I don't have a device that responds this way. Does this code
@ -662,27 +677,55 @@ p_mesgin6:
test SBLKCTL,0x08 jnz p_mesgin6_b
test SCSIID,0x80 jnz p_mesgin6_b
test NEEDSDTR_A,A jz p_mesgin_done # no - ignore rejection
call ndx_sdtr # note use of asynch xfer
test NEEDWDTR_A,A jnz clear_wdtr_a
test NEEDSDTR_A,A jnz clear_sdtr_a
jmp p_mesgin_done # no - ignore rejection
clear_sdtr_a:
call ndx_dtr # note use of asynch xfer
mov DINDEX,SINDEX
clr DINDIR
and DINDIR,0x80,SINDIR
not A
and NEEDSDTR_A,A
jmp p_mesgin6_done
jmp clear_sdtr_done
clear_wdtr_a:
call ndx_dtr # note use of 8bit xfer
mov DINDEX,SINDEX
and DINDIR,0x7f,SINDIR
not A
and NEEDWDTR_A,A
jmp clear_wdtr_done
p_mesgin6_b:
test NEEDSDTR_B,A jz p_mesgin_done # no - ignore rejection
call ndx_sdtr # note use of asynch xfer
test NEEDWDTR_B,A jnz clear_wdtr_b
test NEEDSDTR_B,A jnz clear_sdtr_b
jmp p_mesgin_done # no - ignore rejection
clear_wdtr_b:
call ndx_dtr # note use of 8bit xfer
mov DINDEX,SINDEX
clr DINDIR
and DINDIR,0x7f,SINDIR
not A
and NEEDWDTR_B,A
clear_wdtr_done:
and SCSIRATE,0x7f # select 8bit xfer
jmp p_mesgin_done
clear_sdtr_b:
call ndx_dtr # note use of asynch xfer
mov DINDEX,SINDEX
and DINDIR,0x80,SINDIR
not A
and NEEDSDTR_B,A
p_mesgin6_done:
clr SCSIRATE # select asynch xfer
clear_sdtr_done:
and SCSIRATE,0xf0 # select asynch xfer
jmp p_mesgin_done
# [ ADD MORE MESSAGE HANDLING HERE ]
@ -731,9 +774,9 @@ bcopy:
#
mk_mesg:
mvi SEQCTL,0x50 # PAUSEDIS|FASTMODE
test MSG_FLAGS,0x80 jnz mk_mesg1 # active message?
test FLAGS,ACTIVE_MSG jnz mk_mesg1 # active message?
mvi MSG_FLAGS,0x80 # if not, there is now
or FLAGS,ACTIVE_MSG # if not, there is now
mvi MSG_LEN,1 # length = 1
mov MSG_START+0,SINDEX # 1-byte message
@ -839,7 +882,7 @@ dma2:
dma3:
test SINDEX,0x4 jnz dma5 # DIRECTION
dma4:
test DFSTATUS,0x1 jz dma4 # FIFOEMP
test DFSTATUS,0x1 jz dma4 # !FIFOEMP
# Now shut the DMA enables off, and copy STCNT (ie. the underrun
# amount, if any) to the SCB registers; SG_COUNT will get copied to
@ -873,7 +916,7 @@ initialize_b:
mvi SCSICONF_B jmp initialize_2
initialize_wide:
and A, 0xf,SCSICONF_B
and A,0x0f,SCSICONF_B # SCSI_ID_B[210]
initialize_2:
or SCSIID,A
@ -900,7 +943,7 @@ initialize_2:
# STPWEN is 7870-specific, enabling an external termination power source.
#
and A,0x38,SINDIR # PARITY_ENB|SEL_TIM[10]
or SXFRCTL1,0x7,A # ENSTIMER|ACTNEGEN|STPWEN
or SXFRCTL1,0x7,A # ENSTIMER|ACTBEGEB|STPWEN
mvi SIMODE1,0x84 # ENSELTIMO|ENSCSIPERR
# Initialize scatter-gather pointers by setting up the working copy
@ -910,7 +953,7 @@ initialize_2:
# Initialize SCSIRATE with the appropriate value for this target.
#
call ndx_sdtr
call ndx_dtr
mov SCSIRATE,SINDIR
ret
@ -918,8 +961,8 @@ initialize_2:
# message.
#
assert:
test RESELECT,0x80 jz assert1 # reselected?
test RESELECT,0x40 jnz assert1 # seen IDENTIFY?
test FLAGS,RESELECTED jz assert1 # reselected?
test FLAGS,IDENTIFY_SEEN jnz assert1 # seen IDENTIFY?
mvi INTSTAT,SIGNAL_2 # no - cause a kernel panic
@ -1111,39 +1154,73 @@ sg_advance2:
# is in SCSIID), and return the result in SINDEX. The accumulator
# contains the 3->8 decoding of the target ID on return.
#
ndx_sdtr:
ndx_dtr:
shr A,SCSIID,4
test SBLKCTL,0x08 jz ndx_sdtr_2
test SBLKCTL,0x08 jz ndx_dtr_2
or A,0x08 # Channel B entries add 8
ndx_sdtr_2:
ndx_dtr_2:
add SINDEX,SYNCNEG,A
and FUNCTION1,0x70,SCSIID # 3-bit target address decode
mov A,FUNCTION1 ret
# If we need to negotiate transfer parameters, build the SDTR message
# 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_sdtr:
mk_dtr:
mov DINDEX,SINDEX # save SINDEX
call ndx_sdtr
test SCBARRAY+1,0x88 jz mk_sdtr1_a
test NEEDSDTR_B,A jnz mk_sdtr1 # do we need negotiation?
call ndx_dtr
test SCBARRAY+1,0x88 jz mk_dtr_a
test NEEDWDTR_B,A jnz mk_wdtr_16 # do we need negotiation?
test NEEDSDTR_B,A jnz mk_sdtr
ret
mk_sdtr1_a:
test NEEDSDTR_A,A jnz mk_sdtr1 # do we need negotiation?
mk_dtr_a:
test NEEDWDTR_A,A jnz mk_wdtr_16 # do we need negotiation?
test NEEDSDTR_A,A jnz mk_sdtr
ret
mk_sdtr1:
mk_wdtr_16:
mvi ARG_1,1 # 16bit wide bus
mk_wdtr:
mvi DINDIR,1 # extended message
mvi DINDIR,3 # extended message length = 3
mvi DINDIR,1 # SDTR code
mvi DINDIR,25 # REQ/ACK transfer period
mvi DINDIR,15 # REQ/ACK offset
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 # update message length
ret
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
and DINDIR,0xf,SINDIR # Sync Offset
add MSG_LEN,-MSG_START+0,DINDEX # update message length
ret
# Tag Message if Tag enabled in SCB control block. Use SCBPTR as the tag
# value
#mk_tag:
# test SCBARRAY+0,0x10 jz mk_tag_done # Tag Enabled?
# and A,0x03,SCBARRYA+0
# or A,0x20
# mov DINDIR,A
# mov DINDIR,SCBPTR
#
# add MSG_LEN,-MSG_START+0,DINDEX # update message length
#mk_tag_done:
# ret
# 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
@ -1155,3 +1232,18 @@ mk_sdtr1:
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_1,0x18
dec A
jmp sdtr_to_rate_loop
sdtr_to_rate_done:
shr RETURN_1,0x2
add RETURN_1,0x18 ret

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@ -1,6 +1,6 @@
# @(#)aic7xxx.seq 1.31 94/11/25 jda
# @(#)aic7xxx.seq 1.32 94/11/29 jda
#
# Adaptec 274x device driver for Linux.
# Adaptec 274x/284x/294x device driver for Linux.
# Copyright (c) 1994 The University of Calgary Department of Computer Science.
#
# This program is free software; you can redistribute it and/or modify
@ -17,7 +17,7 @@
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
VERSION AIC7XXX_SEQ_VERSION 1.31
VERSION AIC7XXX_SEQ_VERSION 1.32
SCBMASK = 0x1f
@ -97,6 +97,7 @@ SIGNAL_2 = 0x21 # no IDENTIFY after reconnect
SIGNAL_3 = 0x31 # no cmd match for reconnect
SIGNAL_4 = 0x41 # SDTR -> SCSIRATE conversion
STATUS_ERROR = 0x51
SIGNAL_WDTR = 0x61
# 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
@ -116,7 +117,7 @@ STATUS_ERROR = 0x51
# message, so the driver can report an intelligible error if a message is
# rejected.
#
# RESELECT's high bit is true if we are currently handling a reselect;
# 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
@ -131,9 +132,10 @@ DROPATN = 0x30
REJBYTE = 0x31
DISC_DSB_A = 0x32
DISC_DSB_B = 0x33
RESELECT = 0x34
MSG_FLAGS = 0x35
NEEDWDTR_A = 0x34
NEEDWDTR_B = 0x35
MSG_LEN = 0x36
MSG_START+0 = 0x37
MSG_START+1 = 0x38
@ -163,6 +165,11 @@ SCBCOUNT = 0x56 # the actual number of SCBs
FLAGS = 0x57 # Device configuration flags
TWIN_BUS = 0x01
WIDE_BUS = 0x02
CHECK_DTR = 0x08
SENSE = 0x10
ACTIVE_MSG = 0x20
IDENTIFY_SEEN = 0x40
RESELECTED = 0x80
ACTIVE_A = 0x58
ACTIVE_B = 0x59
@ -171,6 +178,7 @@ ACTIVE_B = 0x59
# the number of entries in the Queue In FIFO.
#
start:
test FLAGS,SENSE jnz start_sense
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.
@ -205,6 +213,11 @@ start2:
or ACTIVE_B,A # Mark the current target as busy
jmp start_scb
start_sense:
# Clear the SENSE flag first, then do a normal start_scb
and FLAGS,0xef
jmp start_scb
# Place the currently active back on the queue for later processing
requeue:
mov QINFIFO, SCBPTR
@ -215,11 +228,13 @@ test_a:
or ACTIVE_A,A # Mark the current target as busy
start_scb:
and A,0x08,SCBARRAY+1
mov SBLKCTL,A # select channel, !wide
and SINDEX,0x08,SCBARRAY+1
and A,WIDE_BUS,FLAGS # Wide bus?
or SINDEX,A
mov SBLKCTL,SINDEX # select channel, bus width
mov SCBARRAY+1 call initialize
clr SG_NOLOAD
clr RESELECT
and FLAGS,0x3f # !RESELECTING
# As soon as we get a successful selection, the target should go
# into the message out phase since we have ATN asserted. Prepare
@ -238,7 +253,8 @@ start_scb:
mov A,SINDEX
cmp MSG_START+0,A jne !message # did driver beat us?
mvi MSG_START+1 call mk_sdtr # build SDTR message if needed
test FLAGS,CHECK_DTR jz !message # Don't even bother with DTR?
mvi MSG_START+1 call mk_dtr # build DTR message if needed
!message:
@ -286,7 +302,8 @@ reselect1:
test SSTAT0,0x20 jz reselect1 # SELDI
mov SELID call initialize
mvi RESELECT,0x80 # reselected, no IDENTIFY
and FLAGS,0x3f # reselected, no IDENTIFY
or FLAGS,RESELECTED
# After the [re]selection, make sure that the [re]selection enable
# bit is off. This chip is flaky enough without extra things
@ -495,7 +512,7 @@ p_mesgout5:
p_mesgout6:
mvi CLRSINT1,0x40 # CLRATNO - in case of PHASEMIS
clr MSG_FLAGS # no active msg
and FLAGS,0xdf # no active msg
jmp ITloop
# Message in phase. Bytes are read using Automatic PIO mode, but not
@ -528,9 +545,9 @@ p_mesgin:
# before the command complete code tried processing it.
test SCBARRAY+14,0xff jz status_ok # 0 Status?
call inb_last # ack & turn auto PIO back on
mvi INTSTAT,STATUS_ERROR # let driver know
jmp start_scb
test FLAGS,SENSE jz status_ok
jmp p_mesgin_done
status_ok:
@ -549,50 +566,48 @@ complete:
mvi INTSTAT,0x02 # CMDCMPLT
jmp p_mesgin_done
# Is it an extended message? We only support the synchronous data
# transfer request message, which will probably be in response to
# an SDTR message out from us. If it's not an SDTR, reject it -
# 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.
#
# XXX - we should really reject this if we didn't initiate the SDTR
# negotiation; this may cause problems with unusual devices.
#
p_mesgin1:
cmp A,1 jne p_mesgin2 # extended message code?
mvi A call inb_next
cmp A,3 jne p_mesginN # extended mesg length = 3
mvi A call inb_next
cmp A,1 jne p_mesginN # SDTR 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
jmp p_mesginN
p_mesginWDTR:
cmp ARG_1,2 jne p_mesginN # extended mesg length = 2
mvi A call inb_next # Width of bus
mvi INTSTAT,SIGNAL_WDTR # let driver know
test RETURN_1,0x80 jz p_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 MSG_START+0 call mk_wdtr # build WDTR message
or SINDEX,0x10,SIGSTATE # turn on ATNO
call scsisig
jmp p_mesgin_done
p_mesginSDTR:
cmp ARG_1,3 jne p_mesginN # extended mesg length = 3
mvi ARG_1 call inb_next # xfer period
mvi A call inb_next # REQ/ACK offset
mvi INTSTAT,SIGNAL_4 # call driver to convert
call ndx_sdtr # index sync config for target
mov DINDEX,SINDEX
not A # turn off "need sdtr" flag
test SBLKCTL,0x08 jnz p_mesgin1_b
test SCSIID,0x80 jnz p_mesgin1_b
and NEEDSDTR_A,A
jmp p_mesgin1_save
test RETURN_1,0x80 jz p_mesgin_done# Do we need to mk_sdtr?
p_mesgin1_b:
and NEEDSDTR_B,A
p_mesgin1_save:
and A,0x80,SINDIR # get the WIDEXFER flag
or RETURN_1,A # Set WIDEXFER if necessary
mov DINDIR,RETURN_1 # save returned value
# Even though the SCSI-2 specification says that a device responding
# to our SDTR message should honor our parameters for transmitting
# to us, it doesn't seem to work too well in real life. In particular,
# a lot of CD-ROM and tape units don't function: try using the SDTR
# parameters the device sent us for both transmitting and receiving.
#
mov SCSIRATE,RETURN_1
or FLAGS,ACTIVE_MSG
mvi MSG_START+0 call mk_sdtr
or SINDEX,0x10,SIGSTATE # turn on ATNO
call scsisig
jmp p_mesgin_done
# Is it a disconnect message? Set a flag in the SCB to remind us
@ -638,17 +653,17 @@ p_mesgin5:
# or the driver is trying to abort the command. Either way, something
# untoward has happened and we should just leave it alone.
#
test MSG_FLAGS,0x80 jnz p_mesgin_done
test FLAGS,ACTIVE_MSG jnz p_mesgin_done
and SCBARRAY+0,0xfb # clear disconnect bit in SCB
mvi RESELECT,0xc0 # make note of IDENTIFY
or FLAGS,0xc0 # make note of IDENTIFY
call sg_scb2ram # implied restore pointers
# required on reselect
jmp p_mesgin_done
# Message reject? If we have an outstanding SDTR negotiation, assume
# that it's a response from the target selecting asynchronous transfer,
# Message reject? 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.
#
# XXX - I don't have a device that responds this way. Does this code
@ -662,27 +677,55 @@ p_mesgin6:
test SBLKCTL,0x08 jnz p_mesgin6_b
test SCSIID,0x80 jnz p_mesgin6_b
test NEEDSDTR_A,A jz p_mesgin_done # no - ignore rejection
call ndx_sdtr # note use of asynch xfer
test NEEDWDTR_A,A jnz clear_wdtr_a
test NEEDSDTR_A,A jnz clear_sdtr_a
jmp p_mesgin_done # no - ignore rejection
clear_sdtr_a:
call ndx_dtr # note use of asynch xfer
mov DINDEX,SINDEX
clr DINDIR
and DINDIR,0x80,SINDIR
not A
and NEEDSDTR_A,A
jmp p_mesgin6_done
jmp clear_sdtr_done
clear_wdtr_a:
call ndx_dtr # note use of 8bit xfer
mov DINDEX,SINDEX
and DINDIR,0x7f,SINDIR
not A
and NEEDWDTR_A,A
jmp clear_wdtr_done
p_mesgin6_b:
test NEEDSDTR_B,A jz p_mesgin_done # no - ignore rejection
call ndx_sdtr # note use of asynch xfer
test NEEDWDTR_B,A jnz clear_wdtr_b
test NEEDSDTR_B,A jnz clear_sdtr_b
jmp p_mesgin_done # no - ignore rejection
clear_wdtr_b:
call ndx_dtr # note use of 8bit xfer
mov DINDEX,SINDEX
clr DINDIR
and DINDIR,0x7f,SINDIR
not A
and NEEDWDTR_B,A
clear_wdtr_done:
and SCSIRATE,0x7f # select 8bit xfer
jmp p_mesgin_done
clear_sdtr_b:
call ndx_dtr # note use of asynch xfer
mov DINDEX,SINDEX
and DINDIR,0x80,SINDIR
not A
and NEEDSDTR_B,A
p_mesgin6_done:
clr SCSIRATE # select asynch xfer
clear_sdtr_done:
and SCSIRATE,0xf0 # select asynch xfer
jmp p_mesgin_done
# [ ADD MORE MESSAGE HANDLING HERE ]
@ -731,9 +774,9 @@ bcopy:
#
mk_mesg:
mvi SEQCTL,0x50 # PAUSEDIS|FASTMODE
test MSG_FLAGS,0x80 jnz mk_mesg1 # active message?
test FLAGS,ACTIVE_MSG jnz mk_mesg1 # active message?
mvi MSG_FLAGS,0x80 # if not, there is now
or FLAGS,ACTIVE_MSG # if not, there is now
mvi MSG_LEN,1 # length = 1
mov MSG_START+0,SINDEX # 1-byte message
@ -839,7 +882,7 @@ dma2:
dma3:
test SINDEX,0x4 jnz dma5 # DIRECTION
dma4:
test DFSTATUS,0x1 jz dma4 # FIFOEMP
test DFSTATUS,0x1 jz dma4 # !FIFOEMP
# Now shut the DMA enables off, and copy STCNT (ie. the underrun
# amount, if any) to the SCB registers; SG_COUNT will get copied to
@ -873,7 +916,7 @@ initialize_b:
mvi SCSICONF_B jmp initialize_2
initialize_wide:
and A, 0xf,SCSICONF_B
and A,0x0f,SCSICONF_B # SCSI_ID_B[210]
initialize_2:
or SCSIID,A
@ -900,7 +943,7 @@ initialize_2:
# STPWEN is 7870-specific, enabling an external termination power source.
#
and A,0x38,SINDIR # PARITY_ENB|SEL_TIM[10]
or SXFRCTL1,0x7,A # ENSTIMER|ACTNEGEN|STPWEN
or SXFRCTL1,0x7,A # ENSTIMER|ACTBEGEB|STPWEN
mvi SIMODE1,0x84 # ENSELTIMO|ENSCSIPERR
# Initialize scatter-gather pointers by setting up the working copy
@ -910,7 +953,7 @@ initialize_2:
# Initialize SCSIRATE with the appropriate value for this target.
#
call ndx_sdtr
call ndx_dtr
mov SCSIRATE,SINDIR
ret
@ -918,8 +961,8 @@ initialize_2:
# message.
#
assert:
test RESELECT,0x80 jz assert1 # reselected?
test RESELECT,0x40 jnz assert1 # seen IDENTIFY?
test FLAGS,RESELECTED jz assert1 # reselected?
test FLAGS,IDENTIFY_SEEN jnz assert1 # seen IDENTIFY?
mvi INTSTAT,SIGNAL_2 # no - cause a kernel panic
@ -1111,39 +1154,73 @@ sg_advance2:
# is in SCSIID), and return the result in SINDEX. The accumulator
# contains the 3->8 decoding of the target ID on return.
#
ndx_sdtr:
ndx_dtr:
shr A,SCSIID,4
test SBLKCTL,0x08 jz ndx_sdtr_2
test SBLKCTL,0x08 jz ndx_dtr_2
or A,0x08 # Channel B entries add 8
ndx_sdtr_2:
ndx_dtr_2:
add SINDEX,SYNCNEG,A
and FUNCTION1,0x70,SCSIID # 3-bit target address decode
mov A,FUNCTION1 ret
# If we need to negotiate transfer parameters, build the SDTR message
# 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_sdtr:
mk_dtr:
mov DINDEX,SINDEX # save SINDEX
call ndx_sdtr
test SCBARRAY+1,0x88 jz mk_sdtr1_a
test NEEDSDTR_B,A jnz mk_sdtr1 # do we need negotiation?
call ndx_dtr
test SCBARRAY+1,0x88 jz mk_dtr_a
test NEEDWDTR_B,A jnz mk_wdtr_16 # do we need negotiation?
test NEEDSDTR_B,A jnz mk_sdtr
ret
mk_sdtr1_a:
test NEEDSDTR_A,A jnz mk_sdtr1 # do we need negotiation?
mk_dtr_a:
test NEEDWDTR_A,A jnz mk_wdtr_16 # do we need negotiation?
test NEEDSDTR_A,A jnz mk_sdtr
ret
mk_sdtr1:
mk_wdtr_16:
mvi ARG_1,1 # 16bit wide bus
mk_wdtr:
mvi DINDIR,1 # extended message
mvi DINDIR,3 # extended message length = 3
mvi DINDIR,1 # SDTR code
mvi DINDIR,25 # REQ/ACK transfer period
mvi DINDIR,15 # REQ/ACK offset
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 # update message length
ret
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
and DINDIR,0xf,SINDIR # Sync Offset
add MSG_LEN,-MSG_START+0,DINDEX # update message length
ret
# Tag Message if Tag enabled in SCB control block. Use SCBPTR as the tag
# value
#mk_tag:
# test SCBARRAY+0,0x10 jz mk_tag_done # Tag Enabled?
# and A,0x03,SCBARRYA+0
# or A,0x20
# mov DINDIR,A
# mov DINDIR,SCBPTR
#
# add MSG_LEN,-MSG_START+0,DINDEX # update message length
#mk_tag_done:
# ret
# 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
@ -1155,3 +1232,18 @@ mk_sdtr1:
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_1,0x18
dec A
jmp sdtr_to_rate_loop
sdtr_to_rate_done:
shr RETURN_1,0x2
add RETURN_1,0x18 ret