diff options
Diffstat (limited to 'sys/dev')
| -rw-r--r-- | sys/dev/aic7xxx/aic7xxx.seq | 254 |
1 files changed, 173 insertions, 81 deletions
diff --git a/sys/dev/aic7xxx/aic7xxx.seq b/sys/dev/aic7xxx/aic7xxx.seq index a112033..d1ed1e1 100644 --- a/sys/dev/aic7xxx/aic7xxx.seq +++ b/sys/dev/aic7xxx/aic7xxx.seq @@ -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 @@ -1111,40 +1154,74 @@ 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,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 - mvi DINDIR,25 # REQ/ACK transfer period - mvi DINDIR,15 # REQ/ACK offset + 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 # it has to send an ABORT or RESET message, then it needs to know this @@ -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 |
