d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

At $Ids to all files. Have the sequencer use DMA to tranfer its SCB

Browse Source 
(SCSI control block) instead of having the host PIO it down.  Also
reimplement WDTR and SDTR optimization to remove code in the sequencer
and place the responsibility of knowing when to initiate SDTR or WDTR
on the kernel driver.  This vastly shortens the sequencer program yet
yeilds the same performance.
This commit is contained in:
Justin T. Gibbs 1995-01-16 16:31:21 +00:00
parent 03b38adc65
commit 0d56403998
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=5647
6 changed files with 260 additions and 218 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

235
sys/dev/aic7xxx/aic7xxx.seq
View File

@ -1,6 +1,6 @@
# @(#)aic7xxx.seq 1.32 94/11/29 jda
#
# Adaptec 274x/284x/294x device driver for Linux.
# Adaptec 274x/284x/294x device driver for Linux and FreeBSD.
# Copyright (c) 1994 The University of Calgary Department of Computer Science.
#
# This program is free software; you can redistribute it and/or modify
@ -16,8 +16,14 @@
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
VERSION AIC7XXX_SEQ_VERSION 1.32
# FreeBSD, Twin, Wide, 2 command per target support, and other optimizations
# provided by Justin T. Gibbs (gibbs@FreeBSD.org)
#
# $Id$
VERSION AIC7XXX_SEQ_VERSION 1.5
SCBMASK = 0x1f
@ -70,14 +76,30 @@ SCSICONF_B = 0x5b
# The two reserved bytes at SCBARRAY+1[23] are expected to be set to
# zero, and the reserved bit in SCBARRAY+0 is used as an internal flag
# to indicate whether or not to reload scatter-gather parameters after
# a disconnect.
# a disconnect. 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
SG_LOAD = 0x10
NEEDSDTR = 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
@ -90,14 +112,16 @@ SCBARRAY+22 = 0xb6
SCBARRAY+23 = 0xb7
SCBARRAY+24 = 0xb8
SCBARRAY+25 = 0xb9
SCBARRAY+26 = 0xba
SIGNAL_0 = 0x01 # unknown scsi bus phase
SIGNAL_1 = 0x11 # message reject
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
BAD_PHASE = 0x01 # unknown scsi bus phase
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 recieved
MSG_WDTR = 0x51 # WDTR message recieved
MSG_REJECT = 0x61 # Reject message recieved
BAD_STATUS = 0x71 # Bad status from target
# 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
@ -107,10 +131,10 @@ SIGNAL_WDTR = 0x61
# 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 irregardless of
# whether the bios has been installed. NEEDSDTR has one bit per target
# indicating if an SDTR message is needed for that device - this will
# be set initially (based on a search through the target scratch space),
# as well as after a bus reset condition.
# whether the bios has been installed. NEEDWDTR and NEEDSDTR are the top
# two 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.
#
# The high bit of DROPATN is set if ATN should be dropped before the ACK
# when outb is called. REJBYTE contains the first byte of a MESSAGE IN
@ -133,9 +157,6 @@ REJBYTE = 0x31
DISC_DSB_A = 0x32
DISC_DSB_B = 0x33
NEEDWDTR_A = 0x34
NEEDWDTR_B = 0x35
MSG_LEN = 0x36
MSG_START+0 = 0x37
MSG_START+1 = 0x38
@ -146,13 +167,16 @@ MSG_START+5 = 0x3c
-MSG_START+0 = 0xc9 # 2's complement of MSG_START+0
ARG_1 = 0x4c # sdtr conversion args & return
BUS_16_BIT = 0x01
RETURN_1 = 0x4c
SIGSTATE = 0x4d # value written to SCSISIGO
NEEDSDTR_A = 0x4e # send SDTR message, 1 bit/trgt
NEEDSDTR_B = 0x4f
SG_SIZEOF = 0x8 # sizeof(struct scatterlist)
# Linux users should use 0xc (12) for SG_SIZEOF
SG_SIZEOF = 0x8 # sizeof(struct ahc_dma)
#SG_SIZEOF = 0xc # sizeof(struct scatterlist)
SCB_SIZEOF = 0x13 # sizeof SCB to DMA (19 bytes)
SG_NOLOAD = 0x50 # load SG pointer/length?
SG_COUNT = 0x51 # working value of SG count
SG_NEXT = 0x52 # working value of SG pointer
@ -165,7 +189,6 @@ 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
@ -189,13 +212,60 @@ start2:
test SCSISIGI,0x4 jnz reselect # BSYI
test QINCNT,SCBMASK jz start
# We have at least one queued SCB now. 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. 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.
#
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 A,4
mvi DINDEX,HADDR
mvi SCBARRAY+26 call bcopy
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.
#
scb_load1:
test DFSTATUS,0x8 jz scb_load1 # HDONE
clr DFCNTRL # disable DMA
scb_load2:
test DFCNTRL,0x8 jnz scb_load2 # HDMAENACK
# Copy the SCB from the FIFO to the SCBARRAY
mov SCBARRAY+0, DFDAT
mov SCBARRAY+1, DFDAT
mov SCBARRAY+2, DFDAT
mov SCBARRAY+3, DFDAT
mov SCBARRAY+4, DFDAT
mov SCBARRAY+5, DFDAT
mov SCBARRAY+6, DFDAT
mov SCBARRAY+7, DFDAT
mov SCBARRAY+8, DFDAT
mov SCBARRAY+9, DFDAT
mov SCBARRAY+10, DFDAT
mov SCBARRAY+11, DFDAT
mov SCBARRAY+12, DFDAT
mov SCBARRAY+13, DFDAT
mov SCBARRAY+14, DFDAT
mov SCBARRAY+15, DFDAT
mov SCBARRAY+16, DFDAT
mov SCBARRAY+17, DFDAT
mov SCBARRAY+18, DFDAT
and SCBARRAY+0, 0xf7
# 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
@ -205,6 +275,7 @@ start2:
# assumes that the kernel driver will clear the active flags on board
# initialization, board reset, and a target's SELTO.
test_busy:
and FUNCTION1,0x70,SCBARRAY+1
mov A,FUNCTION1
test SCBARRAY+1,0x88 jz test_a # Id < 8 && A channel
@ -228,6 +299,7 @@ test_a:
or ACTIVE_A,A # Mark the current target as busy
start_scb:
or SCBARRAY+0,NEEDDMA
and SINDEX,0x08,SCBARRAY+1
and A,WIDE_BUS,FLAGS # Wide bus?
or SINDEX,A
@ -252,8 +324,8 @@ start_scb:
or SINDEX,0x80 call mk_mesg # IDENTIFY message
mov A,SINDEX
test SCBARRAY+0,0xc0 jz !message # WDTR or SDTR??
cmp MSG_START+0,A jne !message # did driver beat us?
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:
@ -337,7 +409,7 @@ ITloop:
cmp A,0xa0 je p_mesgout
cmp A,0xe0 je p_mesgin
mvi INTSTAT,SIGNAL_0 # unknown - signal driver
mvi INTSTAT,BAD_PHASE # unknown - signal driver
p_dataout:
mvi 0 call scsisig # !CDO|!IOO|!MSGO
@ -544,8 +616,8 @@ p_mesgin:
# extra work in the kernel driver to ensure that the entry was removed
# before the command complete code tried processing it.
test SCBARRAY+14,0xff jz status_ok # 0 Status?
mvi INTSTAT,STATUS_ERROR # let driver know
test SCBARRAY+14,0xff jz status_ok # 0 Status?
mvi INTSTAT,BAD_STATUS # let driver know
test FLAGS,SENSE jz status_ok
jmp p_mesgin_done
@ -585,12 +657,13 @@ p_mesgin1:
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
mvi INTSTAT,MSG_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 DINDEX,MSG_START+0
mvi MSG_START+0 call mk_wdtr # build WDTR message
or SINDEX,0x10,SIGSTATE # turn on ATNO
call scsisig
@ -600,11 +673,12 @@ 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
mvi INTSTAT,MSG_SDTR # call driver to convert
test RETURN_1,0x80 jz p_mesgin_done# Do we need to mk_sdtr?
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
@ -662,70 +736,15 @@ p_mesgin5:
# required on reselect
jmp p_mesgin_done
# 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
# actually work?
# 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.
#
p_mesgin6:
cmp A,7 jne p_mesgin7 # message reject code?
and FUNCTION1,0x70,SCSIID # outstanding SDTR message?
mov A,FUNCTION1
test SBLKCTL,0x08 jnz p_mesgin6_b
test SCSIID,0x80 jnz p_mesgin6_b
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
and DINDIR,0x80,SINDIR
not A
and NEEDSDTR_A,A
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 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
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
clear_sdtr_done:
and SCSIRATE,0xf0 # select asynch xfer
mvi INTSTAT, MSG_REJECT
jmp p_mesgin_done
# [ ADD MORE MESSAGE HANDLING HERE ]
@ -742,7 +761,7 @@ p_mesgin7:
p_mesginN:
or SINDEX,0x10,SIGSTATE # turn on ATNO
call scsisig
mvi INTSTAT,SIGNAL_1 # let driver know
mvi INTSTAT,SEND_REJECT # let driver know
mvi 0x7 call mk_mesg # MESSAGE REJECT message
@ -964,7 +983,7 @@ assert:
test FLAGS,RESELECTED jz assert1 # reselected?
test FLAGS,IDENTIFY_SEEN jnz assert1 # seen IDENTIFY?
mvi INTSTAT,SIGNAL_2 # no - cause a kernel panic
mvi INTSTAT,NO_IDENT # no - cause a kernel panic
assert1:
ret
@ -1019,7 +1038,7 @@ findSCB2:
mov A,SCBCOUNT
cmp SINDEX,A jne findSCB1
mvi INTSTAT,SIGNAL_3 # not found - signal kernel
mvi INTSTAT,NO_MATCH # not found - signal kernel
mvi 0x6 call mk_mesg # ABORT message
or SINDEX,0x10,SIGSTATE # assert ATNO
@ -1053,7 +1072,7 @@ sg_ram2scb:
and SCBARRAY+0,0xef,SCBARRAY+0
test SG_NOLOAD,0x80 jz sg_ram2scb1 # reload s/g?
or SCBARRAY+0,0x10
or SCBARRAY+0,SG_LOAD
sg_ram2scb1:
ret
@ -1112,10 +1131,16 @@ sg_load2:
mov SCBARRAY+21,DFDAT
mov SCBARRAY+22,DFDAT
# For Linux, we must throw away four bytes since there is a 32bit gap
# in the middle of a struct scatterlist
# mov NONE,DFDAT
# mov NONE,DFDAT
# mov NONE,DFDAT
# mov NONE,DFDAT
mov SCBARRAY+23,DFDAT
mov SCBARRAY+24,DFDAT
mov SCBARRAY+25,DFDAT
mov NONE,DFDAT #Only support 24 bit length.
mov SCBARRAY+25,DFDAT #Only support 24 bit length.
sg_load3:
ret
@ -1173,19 +1198,11 @@ ndx_dtr_2:
mk_dtr:
mov DINDEX,SINDEX # save SINDEX
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_dtr_a:
test NEEDWDTR_A,A jnz mk_wdtr_16 # do we need negotiation?
test NEEDSDTR_A,A jnz mk_sdtr
ret
mk_wdtr_16:
mvi ARG_1,1 # 16bit wide bus
test SCBARRAY+0,NEEDWDTR jnz mk_wdtr_16bit
jmp mk_sdtr
mk_wdtr_16bit:
mvi ARG_1,BUS_16_BIT
mk_wdtr:
mvi DINDIR,1 # extended message
mvi DINDIR,2 # extended message length = 2

2
sys/dev/aic7xxx/aic7xxx_asm.c
View File

@ -25,6 +25,8 @@
*
* A <label> is an <undef-sym> ending in a colon. Spaces, tabs, and commas
* are token separators.
*
* $Id$
*/
/* #define _POSIX_SOURCE 1 */

2
sys/dev/aic7xxx/aicasm.c
View File

@ -25,6 +25,8 @@
*
* A <label> is an <undef-sym> ending in a colon. Spaces, tabs, and commas
* are token separators.
*
* $Id$
*/
/* #define _POSIX_SOURCE 1 */

2
sys/dev/aic7xxx/aicasm/aicasm.c
View File

@ -25,6 +25,8 @@
*
* A <label> is an <undef-sym> ending in a colon. Spaces, tabs, and commas
* are token separators.
*
* $Id$
*/
/* #define _POSIX_SOURCE 1 */

2
sys/gnu/misc/aic7xxx/aic7xxx.c
View File

@ -25,6 +25,8 @@
*
* A <label> is an <undef-sym> ending in a colon. Spaces, tabs, and commas
* are token separators.
*
* $Id$
*/
/* #define _POSIX_SOURCE 1 */

235
sys/gnu/misc/aic7xxx/aic7xxx.seq
View File

@ -1,6 +1,6 @@
# @(#)aic7xxx.seq 1.32 94/11/29 jda
#
# Adaptec 274x/284x/294x device driver for Linux.
# Adaptec 274x/284x/294x device driver for Linux and FreeBSD.
# Copyright (c) 1994 The University of Calgary Department of Computer Science.
#
# This program is free software; you can redistribute it and/or modify
@ -16,8 +16,14 @@
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
VERSION AIC7XXX_SEQ_VERSION 1.32
# FreeBSD, Twin, Wide, 2 command per target support, and other optimizations
# provided by Justin T. Gibbs (gibbs@FreeBSD.org)
#
# $Id$
VERSION AIC7XXX_SEQ_VERSION 1.5
SCBMASK = 0x1f
@ -70,14 +76,30 @@ SCSICONF_B = 0x5b
# The two reserved bytes at SCBARRAY+1[23] are expected to be set to
# zero, and the reserved bit in SCBARRAY+0 is used as an internal flag
# to indicate whether or not to reload scatter-gather parameters after
# a disconnect.
# a disconnect. 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
SG_LOAD = 0x10
NEEDSDTR = 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
@ -90,14 +112,16 @@ SCBARRAY+22 = 0xb6
SCBARRAY+23 = 0xb7
SCBARRAY+24 = 0xb8
SCBARRAY+25 = 0xb9
SCBARRAY+26 = 0xba
SIGNAL_0 = 0x01 # unknown scsi bus phase
SIGNAL_1 = 0x11 # message reject
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
BAD_PHASE = 0x01 # unknown scsi bus phase
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 recieved
MSG_WDTR = 0x51 # WDTR message recieved
MSG_REJECT = 0x61 # Reject message recieved
BAD_STATUS = 0x71 # Bad status from target
# 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
@ -107,10 +131,10 @@ SIGNAL_WDTR = 0x61
# 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 irregardless of
# whether the bios has been installed. NEEDSDTR has one bit per target
# indicating if an SDTR message is needed for that device - this will
# be set initially (based on a search through the target scratch space),
# as well as after a bus reset condition.
# whether the bios has been installed. NEEDWDTR and NEEDSDTR are the top
# two 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.
#
# The high bit of DROPATN is set if ATN should be dropped before the ACK
# when outb is called. REJBYTE contains the first byte of a MESSAGE IN
@ -133,9 +157,6 @@ REJBYTE = 0x31
DISC_DSB_A = 0x32
DISC_DSB_B = 0x33
NEEDWDTR_A = 0x34
NEEDWDTR_B = 0x35
MSG_LEN = 0x36
MSG_START+0 = 0x37
MSG_START+1 = 0x38
@ -146,13 +167,16 @@ MSG_START+5 = 0x3c
-MSG_START+0 = 0xc9 # 2's complement of MSG_START+0
ARG_1 = 0x4c # sdtr conversion args & return
BUS_16_BIT = 0x01
RETURN_1 = 0x4c
SIGSTATE = 0x4d # value written to SCSISIGO
NEEDSDTR_A = 0x4e # send SDTR message, 1 bit/trgt
NEEDSDTR_B = 0x4f
SG_SIZEOF = 0x8 # sizeof(struct scatterlist)
# Linux users should use 0xc (12) for SG_SIZEOF
SG_SIZEOF = 0x8 # sizeof(struct ahc_dma)
#SG_SIZEOF = 0xc # sizeof(struct scatterlist)
SCB_SIZEOF = 0x13 # sizeof SCB to DMA (19 bytes)
SG_NOLOAD = 0x50 # load SG pointer/length?
SG_COUNT = 0x51 # working value of SG count
SG_NEXT = 0x52 # working value of SG pointer
@ -165,7 +189,6 @@ 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
@ -189,13 +212,60 @@ start2:
test SCSISIGI,0x4 jnz reselect # BSYI
test QINCNT,SCBMASK jz start
# We have at least one queued SCB now. 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. 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.
#
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 A,4
mvi DINDEX,HADDR
mvi SCBARRAY+26 call bcopy
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.
#
scb_load1:
test DFSTATUS,0x8 jz scb_load1 # HDONE
clr DFCNTRL # disable DMA
scb_load2:
test DFCNTRL,0x8 jnz scb_load2 # HDMAENACK
# Copy the SCB from the FIFO to the SCBARRAY
mov SCBARRAY+0, DFDAT
mov SCBARRAY+1, DFDAT
mov SCBARRAY+2, DFDAT
mov SCBARRAY+3, DFDAT
mov SCBARRAY+4, DFDAT
mov SCBARRAY+5, DFDAT
mov SCBARRAY+6, DFDAT
mov SCBARRAY+7, DFDAT
mov SCBARRAY+8, DFDAT
mov SCBARRAY+9, DFDAT
mov SCBARRAY+10, DFDAT
mov SCBARRAY+11, DFDAT
mov SCBARRAY+12, DFDAT
mov SCBARRAY+13, DFDAT
mov SCBARRAY+14, DFDAT
mov SCBARRAY+15, DFDAT
mov SCBARRAY+16, DFDAT
mov SCBARRAY+17, DFDAT
mov SCBARRAY+18, DFDAT
and SCBARRAY+0, 0xf7
# 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
@ -205,6 +275,7 @@ start2:
# assumes that the kernel driver will clear the active flags on board
# initialization, board reset, and a target's SELTO.
test_busy:
and FUNCTION1,0x70,SCBARRAY+1
mov A,FUNCTION1
test SCBARRAY+1,0x88 jz test_a # Id < 8 && A channel
@ -228,6 +299,7 @@ test_a:
or ACTIVE_A,A # Mark the current target as busy
start_scb:
or SCBARRAY+0,NEEDDMA
and SINDEX,0x08,SCBARRAY+1
and A,WIDE_BUS,FLAGS # Wide bus?
or SINDEX,A
@ -252,8 +324,8 @@ start_scb:
or SINDEX,0x80 call mk_mesg # IDENTIFY message
mov A,SINDEX
test SCBARRAY+0,0xc0 jz !message # WDTR or SDTR??
cmp MSG_START+0,A jne !message # did driver beat us?
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:
@ -337,7 +409,7 @@ ITloop:
cmp A,0xa0 je p_mesgout
cmp A,0xe0 je p_mesgin
mvi INTSTAT,SIGNAL_0 # unknown - signal driver
mvi INTSTAT,BAD_PHASE # unknown - signal driver
p_dataout:
mvi 0 call scsisig # !CDO|!IOO|!MSGO
@ -544,8 +616,8 @@ p_mesgin:
# extra work in the kernel driver to ensure that the entry was removed
# before the command complete code tried processing it.
test SCBARRAY+14,0xff jz status_ok # 0 Status?
mvi INTSTAT,STATUS_ERROR # let driver know
test SCBARRAY+14,0xff jz status_ok # 0 Status?
mvi INTSTAT,BAD_STATUS # let driver know
test FLAGS,SENSE jz status_ok
jmp p_mesgin_done
@ -585,12 +657,13 @@ p_mesgin1:
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
mvi INTSTAT,MSG_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 DINDEX,MSG_START+0
mvi MSG_START+0 call mk_wdtr # build WDTR message
or SINDEX,0x10,SIGSTATE # turn on ATNO
call scsisig
@ -600,11 +673,12 @@ 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
mvi INTSTAT,MSG_SDTR # call driver to convert
test RETURN_1,0x80 jz p_mesgin_done# Do we need to mk_sdtr?
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
@ -662,70 +736,15 @@ p_mesgin5:
# required on reselect
jmp p_mesgin_done
# 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
# actually work?
# 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.
#
p_mesgin6:
cmp A,7 jne p_mesgin7 # message reject code?
and FUNCTION1,0x70,SCSIID # outstanding SDTR message?
mov A,FUNCTION1
test SBLKCTL,0x08 jnz p_mesgin6_b
test SCSIID,0x80 jnz p_mesgin6_b
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
and DINDIR,0x80,SINDIR
not A
and NEEDSDTR_A,A
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 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
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
clear_sdtr_done:
and SCSIRATE,0xf0 # select asynch xfer
mvi INTSTAT, MSG_REJECT
jmp p_mesgin_done
# [ ADD MORE MESSAGE HANDLING HERE ]
@ -742,7 +761,7 @@ p_mesgin7:
p_mesginN:
or SINDEX,0x10,SIGSTATE # turn on ATNO
call scsisig
mvi INTSTAT,SIGNAL_1 # let driver know
mvi INTSTAT,SEND_REJECT # let driver know
mvi 0x7 call mk_mesg # MESSAGE REJECT message
@ -964,7 +983,7 @@ assert:
test FLAGS,RESELECTED jz assert1 # reselected?
test FLAGS,IDENTIFY_SEEN jnz assert1 # seen IDENTIFY?
mvi INTSTAT,SIGNAL_2 # no - cause a kernel panic
mvi INTSTAT,NO_IDENT # no - cause a kernel panic
assert1:
ret
@ -1019,7 +1038,7 @@ findSCB2:
mov A,SCBCOUNT
cmp SINDEX,A jne findSCB1
mvi INTSTAT,SIGNAL_3 # not found - signal kernel
mvi INTSTAT,NO_MATCH # not found - signal kernel
mvi 0x6 call mk_mesg # ABORT message
or SINDEX,0x10,SIGSTATE # assert ATNO
@ -1053,7 +1072,7 @@ sg_ram2scb:
and SCBARRAY+0,0xef,SCBARRAY+0
test SG_NOLOAD,0x80 jz sg_ram2scb1 # reload s/g?
or SCBARRAY+0,0x10
or SCBARRAY+0,SG_LOAD
sg_ram2scb1:
ret
@ -1112,10 +1131,16 @@ sg_load2:
mov SCBARRAY+21,DFDAT
mov SCBARRAY+22,DFDAT
# For Linux, we must throw away four bytes since there is a 32bit gap
# in the middle of a struct scatterlist
# mov NONE,DFDAT
# mov NONE,DFDAT
# mov NONE,DFDAT
# mov NONE,DFDAT
mov SCBARRAY+23,DFDAT
mov SCBARRAY+24,DFDAT
mov SCBARRAY+25,DFDAT
mov NONE,DFDAT #Only support 24 bit length.
mov SCBARRAY+25,DFDAT #Only support 24 bit length.
sg_load3:
ret
@ -1173,19 +1198,11 @@ ndx_dtr_2:
mk_dtr:
mov DINDEX,SINDEX # save SINDEX
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_dtr_a:
test NEEDWDTR_A,A jnz mk_wdtr_16 # do we need negotiation?
test NEEDSDTR_A,A jnz mk_sdtr
ret
mk_wdtr_16:
mvi ARG_1,1 # 16bit wide bus
test SCBARRAY+0,NEEDWDTR jnz mk_wdtr_16bit
jmp mk_sdtr
mk_wdtr_16bit:
mvi ARG_1,BUS_16_BIT
mk_wdtr:
mvi DINDIR,1 # extended message
mvi DINDIR,2 # extended message length = 2