aic7xxx.seq revision 4866
14866Sgibbs# @(#)aic7xxx.seq 1.31 94/11/25 jda 24568Sgibbs# 34568Sgibbs# Adaptec 274x device driver for Linux. 44568Sgibbs# Copyright (c) 1994 The University of Calgary Department of Computer Science. 54568Sgibbs# 64568Sgibbs# This program is free software; you can redistribute it and/or modify 74568Sgibbs# it under the terms of the GNU General Public License as published by 84568Sgibbs# the Free Software Foundation; either version 2 of the License, or 94568Sgibbs# (at your option) any later version. 104568Sgibbs# 114568Sgibbs# This program is distributed in the hope that it will be useful, 124568Sgibbs# but WITHOUT ANY WARRANTY; without even the implied warranty of 134568Sgibbs# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 144568Sgibbs# GNU General Public License for more details. 154568Sgibbs# 164568Sgibbs# You should have received a copy of the GNU General Public License 174568Sgibbs# along with this program; if not, write to the Free Software 184568Sgibbs# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 194568Sgibbs 204866SgibbsVERSION AIC7XXX_SEQ_VERSION 1.31 214568Sgibbs 224866SgibbsSCBMASK = 0x1f 234568Sgibbs 244568SgibbsSCSISEQ = 0x00 254568SgibbsSXFRCTL0 = 0x01 264568SgibbsSXFRCTL1 = 0x02 274568SgibbsSCSISIGI = 0x03 284568SgibbsSCSISIGO = 0x03 294568SgibbsSCSIRATE = 0x04 304568SgibbsSCSIID = 0x05 314568SgibbsSCSIDATL = 0x06 324568SgibbsSTCNT = 0x08 334568SgibbsSTCNT+0 = 0x08 344568SgibbsSTCNT+1 = 0x09 354568SgibbsSTCNT+2 = 0x0a 364568SgibbsSSTAT0 = 0x0b 374568SgibbsCLRSINT1 = 0x0c 384568SgibbsSSTAT1 = 0x0c 394568SgibbsSIMODE1 = 0x11 404568SgibbsSCSIBUSL = 0x12 414568SgibbsSHADDR = 0x14 424568SgibbsSELID = 0x19 434568SgibbsSBLKCTL = 0x1f 444568SgibbsSEQCTL = 0x60 454568SgibbsA = 0x64 # == ACCUM 464568SgibbsSINDEX = 0x65 474568SgibbsDINDEX = 0x66 484568SgibbsALLZEROS = 0x6a 494568SgibbsNONE = 0x6a 504568SgibbsSINDIR = 0x6c 514568SgibbsDINDIR = 0x6d 524568SgibbsFUNCTION1 = 0x6e 534568SgibbsHADDR = 0x88 544568SgibbsHCNT = 0x8c 554568SgibbsHCNT+0 = 0x8c 564568SgibbsHCNT+1 = 0x8d 574568SgibbsHCNT+2 = 0x8e 584568SgibbsSCBPTR = 0x90 594568SgibbsINTSTAT = 0x91 604568SgibbsDFCNTRL = 0x93 614568SgibbsDFSTATUS = 0x94 624568SgibbsDFDAT = 0x99 634568SgibbsQINFIFO = 0x9b 644568SgibbsQINCNT = 0x9c 654568SgibbsQOUTFIFO = 0x9d 664568Sgibbs 674568SgibbsSCSICONF = 0x5a 684568Sgibbs 694568Sgibbs# The two reserved bytes at SCBARRAY+1[23] are expected to be set to 704568Sgibbs# zero, and the reserved bit in SCBARRAY+0 is used as an internal flag 714568Sgibbs# to indicate whether or not to reload scatter-gather parameters after 724568Sgibbs# a disconnect. 734568Sgibbs# 744568SgibbsSCBARRAY+0 = 0xa0 754568SgibbsSCBARRAY+1 = 0xa1 764568SgibbsSCBARRAY+2 = 0xa2 774568SgibbsSCBARRAY+3 = 0xa3 784568SgibbsSCBARRAY+7 = 0xa7 794568SgibbsSCBARRAY+11 = 0xab 804568SgibbsSCBARRAY+14 = 0xae 814568SgibbsSCBARRAY+15 = 0xaf 824568SgibbsSCBARRAY+16 = 0xb0 834568SgibbsSCBARRAY+17 = 0xb1 844568SgibbsSCBARRAY+18 = 0xb2 854568SgibbsSCBARRAY+19 = 0xb3 864568SgibbsSCBARRAY+20 = 0xb4 874568SgibbsSCBARRAY+21 = 0xb5 884568SgibbsSCBARRAY+22 = 0xb6 894568SgibbsSCBARRAY+23 = 0xb7 904568SgibbsSCBARRAY+24 = 0xb8 914568SgibbsSCBARRAY+25 = 0xb9 924568Sgibbs 934568SgibbsSIGNAL_0 = 0x01 # unknown scsi bus phase 944568SgibbsSIGNAL_1 = 0x11 # message reject 954568SgibbsSIGNAL_2 = 0x21 # no IDENTIFY after reconnect 964568SgibbsSIGNAL_3 = 0x31 # no cmd match for reconnect 974568SgibbsSIGNAL_4 = 0x41 # SDTR -> SCSIRATE conversion 984568SgibbsSTATUS_ERROR = 0x51 994568Sgibbs 1004568Sgibbs# The host adapter card (at least the BIOS) uses 20-2f for SCSI 1014568Sgibbs# device information, 32-33 and 5a-5f as well. Since we don't support 1024568Sgibbs# wide or twin-bus SCSI, 28-2f can be reclaimed. As it turns out, the 1034568Sgibbs# BIOS trashes 20-27 anyway, writing the synchronous negotiation results 1044568Sgibbs# on top of the BIOS values, so we re-use those for our per-target 1054568Sgibbs# scratchspace (actually a value that can be copied directly into 1064568Sgibbs# SCSIRATE). This implies, since we can't get the BIOS config values, 1074568Sgibbs# that all targets will be negotiated with for synchronous transfer. 1084568Sgibbs# NEEDSDTR has one bit per target indicating if an SDTR message is 1094568Sgibbs# needed for that device - this will be set initially, as well as 1104568Sgibbs# after a bus reset condition. 1114568Sgibbs# 1124568Sgibbs# The high bit of DROPATN is set if ATN should be dropped before the ACK 1134568Sgibbs# when outb is called. REJBYTE contains the first byte of a MESSAGE IN 1144568Sgibbs# message, so the driver can report an intelligible error if a message is 1154568Sgibbs# rejected. 1164568Sgibbs# 1174568Sgibbs# RESELECT's high bit is true if we are currently handling a reselect; 1184568Sgibbs# its next-highest bit is true ONLY IF we've seen an IDENTIFY message 1194568Sgibbs# from the reselecting target. If we haven't had IDENTIFY, then we have 1204568Sgibbs# no idea what the lun is, and we can't select the right SCB register 1214568Sgibbs# bank, so force a kernel panic if the target attempts a data in/out or 1224568Sgibbs# command phase instead of corrupting something. 1234568Sgibbs# 1244568Sgibbs# Note that SG_NEXT occupies four bytes. 1254568Sgibbs# 1264568SgibbsSYNCNEG = 0x20 1274568SgibbsDISC_DSB_A = 0x32 1284568Sgibbs 1294568SgibbsDROPATN = 0x30 1304568SgibbsREJBYTE = 0x31 1314568SgibbsRESELECT = 0x34 1324568Sgibbs 1334568SgibbsMSG_FLAGS = 0x35 1344568SgibbsMSG_LEN = 0x36 1354568SgibbsMSG_START+0 = 0x37 1364568SgibbsMSG_START+1 = 0x38 1374568SgibbsMSG_START+2 = 0x39 1384568SgibbsMSG_START+3 = 0x3a 1394568SgibbsMSG_START+4 = 0x3b 1404568SgibbsMSG_START+5 = 0x3c 1414568Sgibbs-MSG_START+0 = 0xc9 # 2's complement of MSG_START+0 1424568Sgibbs 1434568SgibbsARG_1 = 0x4c # sdtr conversion args & return 1444568SgibbsARG_2 = 0x4d 1454568SgibbsRETURN_1 = 0x4c 1464568Sgibbs 1474568SgibbsSIGSTATE = 0x4e # value written to SCSISIGO 1484568SgibbsNEEDSDTR = 0x4f # send SDTR message, 1 bit/trgt 1494568Sgibbs 1504568SgibbsSG_SIZEOF = 0x8 # sizeof(struct scatterlist) 1514568SgibbsSG_NOLOAD = 0x50 # load SG pointer/length? 1524568SgibbsSG_COUNT = 0x51 # working value of SG count 1534568SgibbsSG_NEXT = 0x52 # working value of SG pointer 1544568SgibbsSG_NEXT+0 = 0x52 1554568SgibbsSG_NEXT+1 = 0x53 1564568SgibbsSG_NEXT+2 = 0x54 1574568SgibbsSG_NEXT+3 = 0x55 1584568Sgibbs 1594568SgibbsSCBCOUNT = 0x56 # the actual number of SCBs 1604568SgibbsACTIVE_A = 0x57 1614568Sgibbs 1624866Sgibbs# Poll QINCNT for work - the lower bits contain 1634568Sgibbs# the number of entries in the Queue In FIFO. 1644568Sgibbs# 1654568Sgibbsstart: 1664568Sgibbs test SCSISIGI,0x4 jnz reselect # BSYI 1674866Sgibbs test QINCNT,SCBMASK jz start 1684568Sgibbs 1694568Sgibbs# We have at least one queued SCB now. Set the SCB pointer 1704568Sgibbs# from the FIFO so we see the right bank of SCB registers, 1714568Sgibbs# then set SCSI options and set the initiator and target 1724568Sgibbs# SCSI IDs. 1734568Sgibbs# 1744568Sgibbs mov SCBPTR,QINFIFO 1754568Sgibbs 1764568Sgibbs# See if there is not already an active SCB for this target. This code 1774568Sgibbs# will have to be modified when we add support for dual and wide busses. 1784568Sgibbs 1794568Sgibbs and FUNCTION1,0x70,SCBARRAY+1 1804568Sgibbs mov A,FUNCTION1 1814568Sgibbs test ACTIVE_A,A jz active 1824568Sgibbs# Place the currently active back on the queue for later processing 1834568Sgibbs mov QINFIFO, SCBPTR 1844568Sgibbs jmp start 1854568Sgibbs 1864568Sgibbs# Mark the current target as busy and get working on the SCB 1874568Sgibbsactive: 1884568Sgibbs or ACTIVE_A,A 1894568Sgibbs mov SCBARRAY+1 call initialize 1904568Sgibbs clr SG_NOLOAD 1914568Sgibbs clr RESELECT 1924568Sgibbs 1934568Sgibbs# As soon as we get a successful selection, the target should go 1944568Sgibbs# into the message out phase since we have ATN asserted. Prepare 1954568Sgibbs# the message to send, locking out the device driver. If the device 1964568Sgibbs# driver hasn't beaten us with an ABORT or RESET message, then tack 1974866Sgibbs# on an SDTR negotiation if required. 1984568Sgibbs# 1994568Sgibbs# Messages are stored in scratch RAM starting with a flag byte (high bit 2004568Sgibbs# set means active message), one length byte, and then the message itself. 2014568Sgibbs# 2024568Sgibbs mov SCBARRAY+1 call disconnect # disconnect ok? 2034568Sgibbs 2044568Sgibbs and SINDEX,0x7,SCBARRAY+1 # lun 2054568Sgibbs or SINDEX,A # return value from disconnect 2064568Sgibbs or SINDEX,0x80 call mk_mesg # IDENTIFY message 2074568Sgibbs 2084568Sgibbs mov A,SINDEX 2094568Sgibbs cmp MSG_START+0,A jne !message # did driver beat us? 2104568Sgibbs mvi MSG_START+1 call mk_sdtr # build SDTR message if needed 2114568Sgibbs 2124568Sgibbs!message: 2134568Sgibbs 2144568Sgibbs# Enable selection phase as an initiator, and do automatic ATN 2154568Sgibbs# after the selection. 2164568Sgibbs# 2174568Sgibbs mvi SCSISEQ,0x48 # ENSELO|ENAUTOATNO 2184568Sgibbs 2194568Sgibbs# Wait for successful arbitration. The AIC-7770 documentation says 2204568Sgibbs# that SELINGO indicates successful arbitration, and that it should 2214568Sgibbs# be used to look for SELDO. However, if the sequencer is paused at 2224568Sgibbs# just the right time - a parallel fsck(8) on two drives did it for 2234568Sgibbs# me - then SELINGO can flip back to false before we've seen it. This 2244568Sgibbs# makes the sequencer sit in the arbitration loop forever. This is 2254568Sgibbs# Not Good. 2264568Sgibbs# 2274568Sgibbs# Therefore, I've added a check in the arbitration loop for SELDO 2284568Sgibbs# too. This could arguably be made a critical section by disabling 2294568Sgibbs# pauses, but I don't want to make a potentially infinite loop a CS. 2304568Sgibbs# I suppose you could fold it into the select loop, too, but since 2314568Sgibbs# I've been hunting this bug for four days it's kinda like a trophy. 2324568Sgibbs# 2334568Sgibbsarbitrate: 2344568Sgibbs test SSTAT0,0x40 jnz *select # SELDO 2354568Sgibbs test SSTAT0,0x10 jz arbitrate # SELINGO 2364568Sgibbs 2374568Sgibbs# Wait for a successful selection. If the hardware selection 2384568Sgibbs# timer goes off, then the driver gets the interrupt, so we don't 2394568Sgibbs# need to worry about it. 2404568Sgibbs# 2414568Sgibbsselect: 2424568Sgibbs test SSTAT0,0x40 jz select # SELDO 2434568Sgibbs jmp *select 2444568Sgibbs 2454568Sgibbs# Reselection is being initiated by a target - we've seen the BSY 2464568Sgibbs# line driven active, and we didn't do it! Enable the reselection 2474568Sgibbs# hardware, and wait for it to finish. Make a note that we've been 2484568Sgibbs# reselected, but haven't seen an IDENTIFY message from the target 2494568Sgibbs# yet. 2504568Sgibbs# 2514568Sgibbsreselect: 2524568Sgibbs mvi SCSISEQ,0x10 # ENRSELI 2534568Sgibbs 2544568Sgibbsreselect1: 2554568Sgibbs test SSTAT0,0x20 jz reselect1 # SELDI 2564568Sgibbs mov SELID call initialize 2574568Sgibbs 2584568Sgibbs mvi RESELECT,0x80 # reselected, no IDENTIFY 2594568Sgibbs 2604568Sgibbs# After the [re]selection, make sure that the [re]selection enable 2614568Sgibbs# bit is off. This chip is flaky enough without extra things 2624568Sgibbs# turned on. Also clear the BUSFREE bit in SSTAT1 since we'll be 2634568Sgibbs# using it shortly. 2644568Sgibbs# 2654568Sgibbs*select: 2664568Sgibbs clr SCSISEQ 2674568Sgibbs mvi CLRSINT1,0x8 # CLRBUSFREE 2684568Sgibbs 2694568Sgibbs# Main loop for information transfer phases. If BSY is false, then 2704568Sgibbs# we have a bus free condition, expected or not. Otherwise, wait 2714568Sgibbs# for the target to assert REQ before checking MSG, C/D and I/O 2724568Sgibbs# for the bus phase. 2734568Sgibbs# 2744568Sgibbs# We can't simply look at the values of SCSISIGI here (if we want 2754568Sgibbs# to do synchronous data transfer), because the target won't assert 2764568Sgibbs# REQ if it's already sent us some data that we haven't acknowledged 2774568Sgibbs# yet. 2784568Sgibbs# 2794568SgibbsITloop: 2804568Sgibbs test SSTAT1,0x8 jnz p_busfree # BUSFREE 2814568Sgibbs test SSTAT1,0x1 jz ITloop # REQINIT 2824568Sgibbs 2834568Sgibbs and A,0xe0,SCSISIGI # CDI|IOI|MSGI 2844568Sgibbs 2854568Sgibbs cmp ALLZEROS,A je p_dataout 2864568Sgibbs cmp A,0x40 je p_datain 2874568Sgibbs cmp A,0x80 je p_command 2884568Sgibbs cmp A,0xc0 je p_status 2894568Sgibbs cmp A,0xa0 je p_mesgout 2904568Sgibbs cmp A,0xe0 je p_mesgin 2914568Sgibbs 2924568Sgibbs mvi INTSTAT,SIGNAL_0 # unknown - signal driver 2934568Sgibbs 2944568Sgibbsp_dataout: 2954568Sgibbs mvi 0 call scsisig # !CDO|!IOO|!MSGO 2964568Sgibbs call assert 2974568Sgibbs call sg_load 2984568Sgibbs 2994568Sgibbs mvi A,3 3004568Sgibbs mvi DINDEX,HCNT 3014568Sgibbs mvi SCBARRAY+23 call bcopy 3024568Sgibbs 3034568Sgibbs mvi A,3 3044568Sgibbs mvi DINDEX,STCNT 3054568Sgibbs mvi SCBARRAY+23 call bcopy 3064568Sgibbs 3074568Sgibbs mvi A,4 3084568Sgibbs mvi DINDEX,HADDR 3094568Sgibbs mvi SCBARRAY+19 call bcopy 3104568Sgibbs 3114568Sgibbs mvi 0x3d call dma # SCSIEN|SDMAEN|HDMAEN| 3124568Sgibbs # DIRECTION|FIFORESET 3134568Sgibbs 3144568Sgibbs# After a DMA finishes, save the final transfer pointer and count 3154568Sgibbs# back into the SCB, in case a device disconnects in the middle of 3164568Sgibbs# a transfer. Use SHADDR and STCNT instead of HADDR and HCNT, since 3174568Sgibbs# it's a reflection of how many bytes were transferred on the SCSI 3184568Sgibbs# (as opposed to the host) bus. 3194568Sgibbs# 3204568Sgibbs mvi A,3 3214568Sgibbs mvi DINDEX,SCBARRAY+23 3224568Sgibbs mvi STCNT call bcopy 3234568Sgibbs 3244568Sgibbs mvi A,4 3254568Sgibbs mvi DINDEX,SCBARRAY+19 3264568Sgibbs mvi SHADDR call bcopy 3274568Sgibbs 3284568Sgibbs call sg_advance 3294568Sgibbs mov SCBARRAY+18,SG_COUNT # residual S/G count 3304568Sgibbs 3314568Sgibbs jmp ITloop 3324568Sgibbs 3334568Sgibbsp_datain: 3344568Sgibbs mvi 0x40 call scsisig # !CDO|IOO|!MSGO 3354568Sgibbs call assert 3364568Sgibbs call sg_load 3374568Sgibbs 3384568Sgibbs mvi A,3 3394568Sgibbs mvi DINDEX,HCNT 3404568Sgibbs mvi SCBARRAY+23 call bcopy 3414568Sgibbs 3424568Sgibbs mvi A,3 3434568Sgibbs mvi DINDEX,STCNT 3444568Sgibbs mvi SCBARRAY+23 call bcopy 3454568Sgibbs 3464568Sgibbs mvi A,4 3474568Sgibbs mvi DINDEX,HADDR 3484568Sgibbs mvi SCBARRAY+19 call bcopy 3494568Sgibbs 3504568Sgibbs mvi 0x39 call dma # SCSIEN|SDMAEN|HDMAEN| 3514568Sgibbs # !DIRECTION|FIFORESET 3524568Sgibbs mvi A,3 3534568Sgibbs mvi DINDEX,SCBARRAY+23 3544568Sgibbs mvi STCNT call bcopy 3554568Sgibbs 3564568Sgibbs mvi A,4 3574568Sgibbs mvi DINDEX,SCBARRAY+19 3584568Sgibbs mvi SHADDR call bcopy 3594568Sgibbs 3604568Sgibbs call sg_advance 3614568Sgibbs mov SCBARRAY+18,SG_COUNT # residual S/G count 3624568Sgibbs 3634568Sgibbs jmp ITloop 3644568Sgibbs 3654568Sgibbs# Command phase. Set up the DMA registers and let 'er rip - the 3664568Sgibbs# two bytes after the SCB SCSI_cmd_length are zeroed by the driver, 3674568Sgibbs# so we can copy those three bytes directly into HCNT. 3684568Sgibbs# 3694568Sgibbsp_command: 3704568Sgibbs mvi 0x80 call scsisig # CDO|!IOO|!MSGO 3714568Sgibbs call assert 3724568Sgibbs 3734568Sgibbs mvi A,3 3744568Sgibbs mvi DINDEX,HCNT 3754568Sgibbs mvi SCBARRAY+11 call bcopy 3764568Sgibbs 3774568Sgibbs mvi A,3 3784568Sgibbs mvi DINDEX,STCNT 3794568Sgibbs mvi SCBARRAY+11 call bcopy 3804568Sgibbs 3814568Sgibbs mvi A,4 3824568Sgibbs mvi DINDEX,HADDR 3834568Sgibbs mvi SCBARRAY+7 call bcopy 3844568Sgibbs 3854568Sgibbs mvi 0x3d call dma # SCSIEN|SDMAEN|HDMAEN| 3864568Sgibbs # DIRECTION|FIFORESET 3874568Sgibbs jmp ITloop 3884568Sgibbs 3894568Sgibbs# Status phase. Wait for the data byte to appear, then read it 3904568Sgibbs# and store it into the SCB. 3914568Sgibbs# 3924568Sgibbsp_status: 3934568Sgibbs mvi 0xc0 call scsisig # CDO|IOO|!MSGO 3944568Sgibbs 3954568Sgibbs mvi SCBARRAY+14 call inb 3964568Sgibbs jmp ITloop 3974568Sgibbs 3984568Sgibbs# Message out phase. If there is no active message, but the target 3994568Sgibbs# took us into this phase anyway, build a no-op message and send it. 4004568Sgibbs# 4014568Sgibbsp_mesgout: 4024568Sgibbs mvi 0xa0 call scsisig # CDO|!IOO|MSGO 4034568Sgibbs mvi 0x8 call mk_mesg # build NOP message 4044568Sgibbs 4054568Sgibbs# Set up automatic PIO transfer from MSG_START. Bit 3 in 4064568Sgibbs# SXFRCTL0 (SPIOEN) is already on. 4074568Sgibbs# 4084568Sgibbs mvi SINDEX,MSG_START+0 4094568Sgibbs mov DINDEX,MSG_LEN 4104568Sgibbs clr A 4114568Sgibbs 4124568Sgibbs# When target asks for a byte, drop ATN if it's the last one in 4134568Sgibbs# the message. Otherwise, keep going until the message is exhausted. 4144568Sgibbs# (We can't use outb for this since it wants the input in SINDEX.) 4154568Sgibbs# 4164568Sgibbs# Keep an eye out for a phase change, in case the target issues 4174568Sgibbs# a MESSAGE REJECT. 4184568Sgibbs# 4194568Sgibbsp_mesgout2: 4204568Sgibbs test SSTAT0,0x2 jz p_mesgout2 # SPIORDY 4214568Sgibbs test SSTAT1,0x10 jnz p_mesgout6 # PHASEMIS 4224568Sgibbs 4234568Sgibbs cmp DINDEX,1 jne p_mesgout3 # last byte? 4244568Sgibbs mvi CLRSINT1,0x40 # CLRATNO - drop ATN 4254568Sgibbs 4264568Sgibbs# Write a byte to the SCSI bus. The AIC-7770 refuses to automatically 4274568Sgibbs# send ACKs in automatic PIO or DMA mode unless you make sure that the 4284568Sgibbs# "expected" bus phase in SCSISIGO matches the actual bus phase. This 4294568Sgibbs# behaviour is completely undocumented and caused me several days of 4304568Sgibbs# grief. 4314568Sgibbs# 4324568Sgibbs# After plugging in different drives to test with and using a longer 4334568Sgibbs# SCSI cable, I found that I/O in Automatic PIO mode ceased to function, 4344568Sgibbs# especially when transferring >1 byte. It seems to be much more stable 4354568Sgibbs# if STCNT is set to one before the transfer, and SDONE (in SSTAT0) is 4364568Sgibbs# polled for transfer completion - for both output _and_ input. The 4374568Sgibbs# only theory I have is that SPIORDY doesn't drop right away when SCSIDATL 4384568Sgibbs# is accessed (like the documentation says it does), and that on a longer 4394568Sgibbs# cable run, the sequencer code was fast enough to loop back and see 4404568Sgibbs# an SPIORDY that hadn't dropped yet. 4414568Sgibbs# 4424568Sgibbsp_mesgout3: 4434568Sgibbs call one_stcnt 4444568Sgibbs mov SCSIDATL,SINDIR 4454568Sgibbs 4464568Sgibbsp_mesgout4: 4474568Sgibbs test SSTAT0,0x4 jz p_mesgout4 # SDONE 4484568Sgibbs dec DINDEX 4494568Sgibbs inc A 4504568Sgibbs cmp MSG_LEN,A jne p_mesgout2 4514568Sgibbs 4524568Sgibbs# If the next bus phase after ATN drops is a message out, it means 4534568Sgibbs# that the target is requesting that the last message(s) be resent. 4544568Sgibbs# 4554568Sgibbsp_mesgout5: 4564568Sgibbs test SSTAT1,0x8 jnz p_mesgout6 # BUSFREE 4574568Sgibbs test SSTAT1,0x1 jz p_mesgout5 # REQINIT 4584568Sgibbs 4594568Sgibbs and A,0xe0,SCSISIGI # CDI|IOI|MSGI 4604568Sgibbs cmp A,0xa0 jne p_mesgout6 4614568Sgibbs mvi 0x10 call scsisig # ATNO - re-assert ATN 4624568Sgibbs 4634568Sgibbs jmp ITloop 4644568Sgibbs 4654568Sgibbsp_mesgout6: 4664568Sgibbs mvi CLRSINT1,0x40 # CLRATNO - in case of PHASEMIS 4674568Sgibbs clr MSG_FLAGS # no active msg 4684568Sgibbs jmp ITloop 4694568Sgibbs 4704568Sgibbs# Message in phase. Bytes are read using Automatic PIO mode, but not 4714568Sgibbs# using inb. This alleviates a race condition, namely that if ATN had 4724568Sgibbs# to be asserted under Automatic PIO mode, it had to beat the SCSI 4734568Sgibbs# circuitry sending an ACK to the target. This showed up under heavy 4744568Sgibbs# loads and really confused things, since ABORT commands wouldn't be 4754568Sgibbs# seen by the drive after an IDENTIFY message in until it had changed 4764568Sgibbs# to a data I/O phase. 4774568Sgibbs# 4784568Sgibbsp_mesgin: 4794568Sgibbs mvi 0xe0 call scsisig # CDO|IOO|MSGO 4804568Sgibbs mvi A call inb_first # read the 1st message byte 4814568Sgibbs mvi REJBYTE,A # save it for the driver 4824568Sgibbs 4834568Sgibbs cmp ALLZEROS,A jne p_mesgin1 4844568Sgibbs 4854568Sgibbs# We got a "command complete" message, so put the SCB pointer 4864568Sgibbs# into the Queue Out, and trigger a completion interrupt. 4874568Sgibbs# Check status for non zero return and interrupt driver if needed 4884568Sgibbs# This allows the driver to do a sense command to find out the 4894568Sgibbs# source of error. We don't bother to post to the QOUTFIFO in 4904568Sgibbs# the error case since it would require extra work in the kernel 4914568Sgibbs# driver to ensure that the entry was removed before the command 4924568Sgibbs# complete code tried processing it. 4934568Sgibbs 4944568Sgibbs# First, mark this target as free. 4954568Sgibbs and FUNCTION1,0x70,SCBARRAY+1 4964568Sgibbs mov A,FUNCTION1 4974568Sgibbs xor ACTIVE_A,A 4984568Sgibbs 4994568Sgibbs test SCBARRAY+14,0xff jz status_ok # 0 Status? 5004568Sgibbs call inb_last # ack & turn auto PIO back on 5014568Sgibbs mvi INTSTAT,STATUS_ERROR # let driver know 5024568Sgibbs jmp ITloop 5034568Sgibbsstatus_ok: 5044568Sgibbs mov QOUTFIFO,SCBPTR 5054568Sgibbs mvi INTSTAT,0x2 # CMDCMPLT 5064568Sgibbs jmp p_mesgin_done 5074568Sgibbs 5084568Sgibbs# Is it an extended message? We only support the synchronous data 5094568Sgibbs# transfer request message, which will probably be in response to 5104568Sgibbs# an SDTR message out from us. If it's not an SDTR, reject it - 5114568Sgibbs# apparently this can be done after any message in byte, according 5124568Sgibbs# to the SCSI-2 spec. 5134568Sgibbs# 5144568Sgibbs# XXX - we should really reject this if we didn't initiate the SDTR 5154568Sgibbs# negotiation; this may cause problems with unusual devices. 5164568Sgibbs# 5174568Sgibbsp_mesgin1: 5184568Sgibbs cmp A,1 jne p_mesgin2 # extended message code? 5194568Sgibbs 5204568Sgibbs mvi A call inb_next 5214568Sgibbs cmp A,3 jne p_mesginN # extended mesg length = 3 5224568Sgibbs mvi A call inb_next 5234568Sgibbs cmp A,1 jne p_mesginN # SDTR code 5244568Sgibbs 5254568Sgibbs mvi ARG_1 call inb_next # xfer period 5264568Sgibbs mvi ARG_2 call inb_next # REQ/ACK offset 5274568Sgibbs mvi INTSTAT,SIGNAL_4 # call driver to convert 5284568Sgibbs 5294568Sgibbs call ndx_sdtr # index sync config for target 5304568Sgibbs mov DINDEX,SINDEX 5314568Sgibbs mov DINDIR,RETURN_1 # save returned value 5324568Sgibbs 5334568Sgibbs not A # turn off "need sdtr" flag 5344568Sgibbs and NEEDSDTR,A 5354568Sgibbs 5364568Sgibbs# Even though the SCSI-2 specification says that a device responding 5374568Sgibbs# to our SDTR message should honor our parameters for transmitting 5384568Sgibbs# to us, it doesn't seem to work too well in real life. In particular, 5394568Sgibbs# a lot of CD-ROM and tape units don't function: try using the SDTR 5404568Sgibbs# parameters the device sent us for both transmitting and receiving. 5414568Sgibbs# 5424568Sgibbs mov SCSIRATE,RETURN_1 5434568Sgibbs jmp p_mesgin_done 5444568Sgibbs 5454568Sgibbs# Is it a disconnect message? Set a flag in the SCB to remind us 5464568Sgibbs# and await the bus going free. 5474568Sgibbs# 5484568Sgibbsp_mesgin2: 5494568Sgibbs cmp A,4 jne p_mesgin3 # disconnect code? 5504568Sgibbs 5514568Sgibbs or SCBARRAY+0,0x4 # set "disconnected" bit 5524568Sgibbs jmp p_mesgin_done 5534568Sgibbs 5544568Sgibbs# Save data pointers message? Copy working values into the SCB, 5554568Sgibbs# usually in preparation for a disconnect. 5564568Sgibbs# 5574568Sgibbsp_mesgin3: 5584568Sgibbs cmp A,2 jne p_mesgin4 # save data pointers code? 5594568Sgibbs 5604568Sgibbs call sg_ram2scb 5614568Sgibbs jmp p_mesgin_done 5624568Sgibbs 5634568Sgibbs# Restore pointers message? Data pointers are recopied from the 5644568Sgibbs# SCB anyway at the start of any DMA operation, so the only thing 5654568Sgibbs# to copy is the scatter-gather values. 5664568Sgibbs# 5674568Sgibbsp_mesgin4: 5684568Sgibbs cmp A,3 jne p_mesgin5 # restore pointers code? 5694568Sgibbs 5704568Sgibbs call sg_scb2ram 5714568Sgibbs jmp p_mesgin_done 5724568Sgibbs 5734568Sgibbs# Identify message? For a reconnecting target, this tells us the lun 5744568Sgibbs# that the reconnection is for - find the correct SCB and switch to it, 5754568Sgibbs# clearing the "disconnected" bit so we don't "find" it by accident later. 5764568Sgibbs# 5774568Sgibbsp_mesgin5: 5784568Sgibbs test A,0x80 jz p_mesgin6 # identify message? 5794568Sgibbs 5804568Sgibbs test A,0x78 jnz p_mesginN # !DiscPriv|!LUNTAR|!Reserved 5814568Sgibbs 5824568Sgibbs mov A call findSCB # switch to correct SCB 5834568Sgibbs 5844568Sgibbs# If a active message is present after calling findSCB, then either it 5854568Sgibbs# or the driver is trying to abort the command. Either way, something 5864568Sgibbs# untoward has happened and we should just leave it alone. 5874568Sgibbs# 5884568Sgibbs test MSG_FLAGS,0x80 jnz p_mesgin_done 5894568Sgibbs 5904568Sgibbs xor SCBARRAY+0,0x4 # clear disconnect bit in SCB 5914568Sgibbs mvi RESELECT,0xc0 # make note of IDENTIFY 5924568Sgibbs 5934568Sgibbs call sg_scb2ram # implied restore pointers 5944568Sgibbs # required on reselect 5954568Sgibbs jmp p_mesgin_done 5964568Sgibbs 5974568Sgibbs# Message reject? If we have an outstanding SDTR negotiation, assume 5984568Sgibbs# that it's a response from the target selecting asynchronous transfer, 5994568Sgibbs# otherwise just ignore it since we have no clue what it pertains to. 6004568Sgibbs# 6014568Sgibbs# XXX - I don't have a device that responds this way. Does this code 6024568Sgibbs# actually work? 6034568Sgibbs# 6044568Sgibbsp_mesgin6: 6054568Sgibbs cmp A,7 jne p_mesgin7 # message reject code? 6064568Sgibbs 6074568Sgibbs and FUNCTION1,0x70,SCSIID # outstanding SDTR message? 6084568Sgibbs mov A,FUNCTION1 6094568Sgibbs test NEEDSDTR,A jz p_mesgin_done # no - ignore rejection 6104568Sgibbs 6114568Sgibbs call ndx_sdtr # note use of asynch xfer 6124568Sgibbs mov DINDEX,SINDEX 6134568Sgibbs clr DINDIR 6144568Sgibbs 6154568Sgibbs not A # turn off "active sdtr" flag 6164568Sgibbs and NEEDSDTR,A 6174568Sgibbs 6184568Sgibbs clr SCSIRATE # select asynch xfer 6194568Sgibbs jmp p_mesgin_done 6204568Sgibbs 6214568Sgibbs# [ ADD MORE MESSAGE HANDLING HERE ] 6224568Sgibbs# 6234568Sgibbsp_mesgin7: 6244568Sgibbs 6254568Sgibbs# We have no idea what this message in is, and there's no way 6264568Sgibbs# to pass it up to the kernel, so we issue a message reject and 6274568Sgibbs# hope for the best. Since we're now using manual PIO mode to 6284568Sgibbs# read in the message, there should no longer be a race condition 6294568Sgibbs# present when we assert ATN. In any case, rejection should be a 6304568Sgibbs# rare occurrence - signal the driver when it happens. 6314568Sgibbs# 6324568Sgibbsp_mesginN: 6334568Sgibbs or SINDEX,0x10,SIGSTATE # turn on ATNO 6344568Sgibbs call scsisig 6354568Sgibbs mvi INTSTAT,SIGNAL_1 # let driver know 6364568Sgibbs 6374568Sgibbs mvi 0x7 call mk_mesg # MESSAGE REJECT message 6384568Sgibbs 6394568Sgibbsp_mesgin_done: 6404568Sgibbs call inb_last # ack & turn auto PIO back on 6414568Sgibbs jmp ITloop 6424568Sgibbs 6434568Sgibbs# Bus free phase. It might be useful to interrupt the device 6444568Sgibbs# driver if we aren't expecting this. For now, make sure that 6454568Sgibbs# ATN isn't being asserted and look for a new command. 6464568Sgibbs# 6474568Sgibbsp_busfree: 6484568Sgibbs mvi CLRSINT1,0x40 # CLRATNO 6494568Sgibbs clr SIGSTATE 6504568Sgibbs jmp start 6514568Sgibbs 6524568Sgibbs# Bcopy: number of bytes to transfer should be in A, DINDEX should 6534568Sgibbs# contain the destination address, and SINDEX should contain the 6544568Sgibbs# source address. All input parameters are trashed on return. 6554568Sgibbs# 6564568Sgibbsbcopy: 6574568Sgibbs mov DINDIR,SINDIR 6584568Sgibbs dec A 6594568Sgibbs cmp ALLZEROS,A jne bcopy 6604568Sgibbs ret 6614568Sgibbs 6624568Sgibbs# Locking the driver out, build a one-byte message passed in SINDEX 6634568Sgibbs# if there is no active message already. SINDEX is returned intact. 6644568Sgibbs# 6654568Sgibbsmk_mesg: 6664866Sgibbs mvi SEQCTL,0x50 # PAUSEDIS|FASTMODE 6674568Sgibbs test MSG_FLAGS,0x80 jnz mk_mesg1 # active message? 6684568Sgibbs 6694568Sgibbs mvi MSG_FLAGS,0x80 # if not, there is now 6704568Sgibbs mvi MSG_LEN,1 # length = 1 6714568Sgibbs mov MSG_START+0,SINDEX # 1-byte message 6724568Sgibbs 6734568Sgibbsmk_mesg1: 6744866Sgibbs mvi SEQCTL,0x10 # !PAUSEDIS|FASTMODE 6754568Sgibbs ret 6764568Sgibbs 6774568Sgibbs# Input byte in Automatic PIO mode. The address to store the byte 6784568Sgibbs# in should be in SINDEX. DINDEX will be used by this routine. 6794568Sgibbs# 6804568Sgibbsinb: 6814568Sgibbs test SSTAT0,0x2 jz inb # SPIORDY 6824568Sgibbs mov DINDEX,SINDEX 6834568Sgibbs call one_stcnt # xfer one byte 6844568Sgibbs mov DINDIR,SCSIDATL 6854568Sgibbsinb1: 6864568Sgibbs test SSTAT0,0x4 jz inb1 # SDONE - wait to "finish" 6874568Sgibbs ret 6884568Sgibbs 6894568Sgibbs# Carefully read data in Automatic PIO mode. I first tried this using 6904568Sgibbs# Manual PIO mode, but it gave me continual underrun errors, probably 6914568Sgibbs# indicating that I did something wrong, but I feel more secure leaving 6924568Sgibbs# Automatic PIO on all the time. 6934568Sgibbs# 6944568Sgibbs# According to Adaptec's documentation, an ACK is not sent on input from 6954568Sgibbs# the target until SCSIDATL is read from. So we wait until SCSIDATL is 6964568Sgibbs# latched (the usual way), then read the data byte directly off the bus 6974568Sgibbs# using SCSIBUSL. When we have pulled the ATN line, or we just want to 6984568Sgibbs# acknowledge the byte, then we do a dummy read from SCISDATL. The SCSI 6994568Sgibbs# spec guarantees that the target will hold the data byte on the bus until 7004568Sgibbs# we send our ACK. 7014568Sgibbs# 7024568Sgibbs# The assumption here is that these are called in a particular sequence, 7034568Sgibbs# and that REQ is already set when inb_first is called. inb_{first,next} 7044568Sgibbs# use the same calling convention as inb. 7054568Sgibbs# 7064568Sgibbsinb_first: 7074568Sgibbs mov DINDEX,SINDEX 7084568Sgibbs mov DINDIR,SCSIBUSL ret # read byte directly from bus 7094568Sgibbs 7104568Sgibbsinb_next: 7114568Sgibbs mov DINDEX,SINDEX # save SINDEX 7124568Sgibbs 7134568Sgibbs call one_stcnt # xfer one byte 7144568Sgibbs mov NONE,SCSIDATL # dummy read from latch to ACK 7154568Sgibbsinb_next1: 7164568Sgibbs test SSTAT0,0x4 jz inb_next1 # SDONE 7174568Sgibbsinb_next2: 7184568Sgibbs test SSTAT0,0x2 jz inb_next2 # SPIORDY - wait for next byte 7194568Sgibbs mov DINDIR,SCSIBUSL ret # read byte directly from bus 7204568Sgibbs 7214568Sgibbsinb_last: 7224568Sgibbs call one_stcnt # ACK with dummy read 7234568Sgibbs mov NONE,SCSIDATL 7244568Sgibbsinb_last1: 7254568Sgibbs test SSTAT0,0x4 jz inb_last1 # wait for completion 7264568Sgibbs ret 7274568Sgibbs 7284568Sgibbs# Output byte in Automatic PIO mode. The byte to output should be 7294568Sgibbs# in SINDEX. If DROPATN's high bit is set, then ATN will be dropped 7304568Sgibbs# before the byte is output. 7314568Sgibbs# 7324568Sgibbsoutb: 7334568Sgibbs test SSTAT0,0x2 jz outb # SPIORDY 7344568Sgibbs call one_stcnt # xfer one byte 7354568Sgibbs 7364568Sgibbs test DROPATN,0x80 jz outb1 7374568Sgibbs mvi CLRSINT1,0x40 # CLRATNO 7384568Sgibbs clr DROPATN 7394568Sgibbsoutb1: 7404568Sgibbs mov SCSIDATL,SINDEX 7414568Sgibbsoutb2: 7424568Sgibbs test SSTAT0,0x4 jz outb2 # SDONE 7434568Sgibbs ret 7444568Sgibbs 7454568Sgibbs# Write the value "1" into the STCNT registers, for Automatic PIO 7464568Sgibbs# transfers. 7474568Sgibbs# 7484568Sgibbsone_stcnt: 7494568Sgibbs clr STCNT+2 7504568Sgibbs clr STCNT+1 7514568Sgibbs mvi STCNT+0,1 ret 7524568Sgibbs 7534568Sgibbs# DMA data transfer. HADDR and HCNT must be loaded first, and 7544568Sgibbs# SINDEX should contain the value to load DFCNTRL with - 0x3d for 7554568Sgibbs# host->scsi, or 0x39 for scsi->host. The SCSI channel is cleared 7564568Sgibbs# during initialization. 7574568Sgibbs# 7584568Sgibbsdma: 7594568Sgibbs mov DFCNTRL,SINDEX 7604568Sgibbsdma1: 7614568Sgibbsdma2: 7624568Sgibbs test SSTAT0,0x1 jnz dma3 # DMADONE 7634568Sgibbs test SSTAT1,0x10 jz dma1 # PHASEMIS, ie. underrun 7644568Sgibbs 7654568Sgibbs# We will be "done" DMAing when the transfer count goes to zero, or 7664568Sgibbs# the target changes the phase (in light of this, it makes sense that 7674568Sgibbs# the DMA circuitry doesn't ACK when PHASEMIS is active). If we are 7684866Sgibbs# doing a SCSI->Host transfer, the data FIFO should be flushed auto- 7694866Sgibbs# magically on STCNT=0 or a phase change, so just wait for FIFO empty 7704866Sgibbs# status. 7714568Sgibbs# 7724568Sgibbsdma3: 7734568Sgibbs test SINDEX,0x4 jnz dma5 # DIRECTION 7744568Sgibbsdma4: 7754866Sgibbs test DFSTATUS,0x1 jz dma4 # FIFOFLUSHACK 7764568Sgibbs 7774568Sgibbs# Now shut the DMA enables off, and copy STCNT (ie. the underrun 7784568Sgibbs# amount, if any) to the SCB registers; SG_COUNT will get copied to 7794568Sgibbs# the SCB's residual S/G count field after sg_advance is called. Make 7804568Sgibbs# sure that the DMA enables are actually off first lest we get an ILLSADDR. 7814568Sgibbs# 7824568Sgibbsdma5: 7834568Sgibbs clr DFCNTRL # disable DMA 7844568Sgibbsdma6: 7854568Sgibbs test DFCNTRL,0x38 jnz dma6 # SCSIENACK|SDMAENACK|HDMAENACK 7864568Sgibbs 7874568Sgibbs mvi A,3 7884568Sgibbs mvi DINDEX,SCBARRAY+15 7894568Sgibbs mvi STCNT call bcopy 7904568Sgibbs 7914568Sgibbs ret 7924568Sgibbs 7934568Sgibbs# Common SCSI initialization for selection and reselection. Expects 7944568Sgibbs# the target SCSI ID to be in the upper four bits of SINDEX, and A's 7954568Sgibbs# contents are stomped on return. 7964568Sgibbs# 7974568Sgibbsinitialize: 7984568Sgibbs clr SBLKCTL # channel A, !wide 7994568Sgibbs and SCSIID,0xf0,SINDEX # target ID 8004568Sgibbs and A,0x7,SCSICONF # SCSI_ID_A[210] 8014568Sgibbs or SCSIID,A 8024568Sgibbs 8034568Sgibbs# Esundry initialization. 8044568Sgibbs# 8054568Sgibbs clr DROPATN 8064568Sgibbs clr SIGSTATE 8074568Sgibbs 8084568Sgibbs# Turn on Automatic PIO mode now, before we expect to see an REQ 8094568Sgibbs# from the target. It shouldn't hurt anything to leave it on. Set 8104568Sgibbs# CLRCHN here before the target has entered a data transfer mode - 8114568Sgibbs# with synchronous SCSI, if you do it later, you blow away some 8124568Sgibbs# data in the SCSI FIFO that the target has already sent to you. 8134568Sgibbs# 8144866Sgibbs# DFON is a 7870 bit enabling digital filtering of REQ and ACK signals. 8154866Sgibbs# 8164866Sgibbs mvi SXFRCTL0,0x8a # DFON|SPIOEN|CLRCHN 8174568Sgibbs 8184568Sgibbs# Set SCSI bus parity checking and the selection timeout value, 8194568Sgibbs# and enable the hardware selection timer. Set the SELTO interrupt 8204568Sgibbs# to signal the driver. 8214568Sgibbs# 8224866Sgibbs# STPWEN is 7870-specific, enabling an external termination power source. 8234866Sgibbs# 8244568Sgibbs and A,0x38,SCSICONF # PARITY_ENB_A|SEL_TIM_A[10] 8254866Sgibbs or SXFRCTL1,0x5,A # ENSTIMER|STPWEN 8264568Sgibbs mvi SIMODE1,0x84 # ENSELTIMO|ENSCSIPERR 8274568Sgibbs 8284568Sgibbs# Initialize scatter-gather pointers by setting up the working copy 8294568Sgibbs# in scratch RAM. 8304568Sgibbs# 8314568Sgibbs call sg_scb2ram 8324568Sgibbs 8334568Sgibbs# Initialize SCSIRATE with the appropriate value for this target. 8344568Sgibbs# 8354568Sgibbs call ndx_sdtr 8364568Sgibbs mov SCSIRATE,SINDIR 8374568Sgibbs ret 8384568Sgibbs 8394568Sgibbs# Assert that if we've been reselected, then we've seen an IDENTIFY 8404568Sgibbs# message. 8414568Sgibbs# 8424568Sgibbsassert: 8434568Sgibbs test RESELECT,0x80 jz assert1 # reselected? 8444568Sgibbs test RESELECT,0x40 jnz assert1 # seen IDENTIFY? 8454568Sgibbs 8464568Sgibbs mvi INTSTAT,SIGNAL_2 # no - cause a kernel panic 8474568Sgibbs 8484568Sgibbsassert1: 8494568Sgibbs ret 8504568Sgibbs 8514568Sgibbs# Find out if disconnection is ok from the information the BIOS has left 8524568Sgibbs# us. The target ID should be in the upper four bits of SINDEX; A will 8534866Sgibbs# contain either 0x40 (disconnection ok) or 0x00 (disconnection not ok) 8544568Sgibbs# on exit. 8554568Sgibbs# 8564568Sgibbs# This is the only place the target ID is limited to three bits, so we 8574568Sgibbs# can use the FUNCTION1 register. 8584568Sgibbs# 8594568Sgibbsdisconnect: 8604568Sgibbs and FUNCTION1,0x70,SINDEX # strip off extra just in case 8614568Sgibbs mov A,FUNCTION1 8624568Sgibbs test DISC_DSB_A,A jz disconnect1 # bit nonzero if DISabled 8634568Sgibbs 8644568Sgibbs clr A ret 8654568Sgibbsdisconnect1: 8664568Sgibbs mvi A,0x40 ret 8674568Sgibbs 8684568Sgibbs# Locate the SCB matching the target ID in SELID and the lun in the lower 8694568Sgibbs# three bits of SINDEX, and switch the SCB to it. Have the kernel print 8704568Sgibbs# a warning message if it can't be found, and generate an ABORT message 8714866Sgibbs# to the target. We keep the value of the t/c/l that we are trying to find 8724568Sgibbs# in DINDEX so it is not overwritten during our check to see if we are 8734568Sgibbs# at the last SCB. 8744568Sgibbs# 8754568SgibbsfindSCB: 8764568Sgibbs and A,0x7,SINDEX # lun in lower three bits 8774568Sgibbs or DINDEX,A,SELID # can I do this? 8784568Sgibbs and DINDEX,0xf7 # only channel A implemented 8794568Sgibbs 8804568Sgibbs clr SINDEX 8814568Sgibbs 8824568SgibbsfindSCB1: 8834866Sgibbs mov A,DINDEX 8844568Sgibbs mov SCBPTR,SINDEX # switch to new SCB 8854568Sgibbs cmp SCBARRAY+1,A jne findSCB2 # target ID/channel/lun match? 8864568Sgibbs test SCBARRAY+0,0x4 jz findSCB2 # should be disconnected 8874568Sgibbs 8884568Sgibbs ret 8894568Sgibbs 8904568SgibbsfindSCB2: 8914568Sgibbs inc SINDEX 8924568Sgibbs mov A,SCBCOUNT 8934568Sgibbs cmp SINDEX,A jne findSCB1 8944568Sgibbs 8954568Sgibbs mvi INTSTAT,SIGNAL_3 # not found - signal kernel 8964568Sgibbs mvi 0x6 call mk_mesg # ABORT message 8974568Sgibbs 8984568Sgibbs or SINDEX,0x10,SIGSTATE # assert ATNO 8994568Sgibbs call scsisig 9004568Sgibbs ret 9014568Sgibbs 9024568Sgibbs# Make a working copy of the scatter-gather parameters in the SCB. 9034568Sgibbs# 9044568Sgibbssg_scb2ram: 9054568Sgibbs mov SG_COUNT,SCBARRAY+2 9064568Sgibbs 9074568Sgibbs mvi A,4 9084568Sgibbs mvi DINDEX,SG_NEXT 9094568Sgibbs mvi SCBARRAY+3 call bcopy 9104568Sgibbs 9114568Sgibbs mvi SG_NOLOAD,0x80 9124568Sgibbs test SCBARRAY+0,0x10 jnz sg_scb2ram1 # don't reload s/g? 9134568Sgibbs clr SG_NOLOAD 9144568Sgibbs 9154568Sgibbssg_scb2ram1: 9164568Sgibbs ret 9174568Sgibbs 9184568Sgibbs# Copying RAM values back to SCB, for Save Data Pointers message. 9194568Sgibbs# 9204568Sgibbssg_ram2scb: 9214568Sgibbs mov SCBARRAY+2,SG_COUNT 9224568Sgibbs 9234568Sgibbs mvi A,4 9244568Sgibbs mvi DINDEX,SCBARRAY+3 9254568Sgibbs mvi SG_NEXT call bcopy 9264568Sgibbs 9274568Sgibbs and SCBARRAY+0,0xef,SCBARRAY+0 9284568Sgibbs test SG_NOLOAD,0x80 jz sg_ram2scb1 # reload s/g? 9294568Sgibbs or SCBARRAY+0,0x10 9304568Sgibbs 9314568Sgibbssg_ram2scb1: 9324568Sgibbs ret 9334568Sgibbs 9344568Sgibbs# Load a struct scatter if needed and set up the data address and 9354568Sgibbs# length. If the working value of the SG count is nonzero, then 9364568Sgibbs# we need to load a new set of values. 9374568Sgibbs# 9384568Sgibbs# This, like the above DMA, assumes a little-endian host data storage. 9394568Sgibbs# 9404568Sgibbssg_load: 9414568Sgibbs test SG_COUNT,0xff jz sg_load3 # SG being used? 9424568Sgibbs test SG_NOLOAD,0x80 jnz sg_load3 # don't reload s/g? 9434568Sgibbs 9444568Sgibbs clr HCNT+2 9454568Sgibbs clr HCNT+1 9464568Sgibbs mvi HCNT+0,SG_SIZEOF 9474568Sgibbs 9484568Sgibbs mvi A,4 9494568Sgibbs mvi DINDEX,HADDR 9504568Sgibbs mvi SG_NEXT call bcopy 9514568Sgibbs 9524568Sgibbs mvi DFCNTRL,0xd # HDMAEN|DIRECTION|FIFORESET 9534568Sgibbs 9544568Sgibbs# Wait for DMA from host memory to data FIFO to complete, then disable 9554568Sgibbs# DMA and wait for it to acknowledge that it's off. 9564568Sgibbs# 9574568Sgibbssg_load1: 9584568Sgibbs test DFSTATUS,0x8 jz sg_load1 # HDONE 9594568Sgibbs 9604568Sgibbs clr DFCNTRL # disable DMA 9614568Sgibbssg_load2: 9624568Sgibbs test DFCNTRL,0x8 jnz sg_load2 # HDMAENACK 9634568Sgibbs 9644568Sgibbs# Copy data from FIFO into SCB data pointer and data count. This assumes 9654568Sgibbs# that the struct scatterlist has this structure (this and sizeof(struct 9664568Sgibbs# scatterlist) == 12 are asserted in aic7xxx.c): 9674568Sgibbs# 9684568Sgibbs# struct scatterlist { 9694568Sgibbs# char *address; /* four bytes, little-endian order */ 9704568Sgibbs# ... /* four bytes, ignored */ 9714568Sgibbs# unsigned short length; /* two bytes, little-endian order */ 9724568Sgibbs# } 9734568Sgibbs# 9744568Sgibbs 9754568Sgibbs# Not in FreeBSD. the scatter list is only 8 bytes. 9764568Sgibbs# 9774568Sgibbs# struct ahc_dma_seg { 9784568Sgibbs# physaddr addr; /* four bytes, little-endian order */ 9794568Sgibbs# long len; /* four bytes, little endian order */ 9804568Sgibbs# }; 9814568Sgibbs# 9824568Sgibbs 9834568Sgibbs mov SCBARRAY+19,DFDAT # new data address 9844568Sgibbs mov SCBARRAY+20,DFDAT 9854568Sgibbs mov SCBARRAY+21,DFDAT 9864568Sgibbs mov SCBARRAY+22,DFDAT 9874568Sgibbs 9884568Sgibbs mov SCBARRAY+23,DFDAT 9894568Sgibbs mov SCBARRAY+24,DFDAT 9904568Sgibbs mov SCBARRAY+25,DFDAT 9914568Sgibbs mov NONE,DFDAT #Only support 24 bit length. 9924568Sgibbs 9934568Sgibbssg_load3: 9944568Sgibbs ret 9954568Sgibbs 9964568Sgibbs# Advance the scatter-gather pointers only IF NEEDED. If SG is enabled, 9974568Sgibbs# and the SCSI transfer count is zero (note that this should be called 9984568Sgibbs# right after a DMA finishes), then move the working copies of the SG 9994568Sgibbs# pointer/length along. If the SCSI transfer count is not zero, then 10004568Sgibbs# presumably the target is disconnecting - do not reload the SG values 10014568Sgibbs# next time. 10024568Sgibbs# 10034568Sgibbssg_advance: 10044568Sgibbs test SG_COUNT,0xff jz sg_advance2 # s/g enabled? 10054568Sgibbs 10064568Sgibbs test STCNT+0,0xff jnz sg_advance1 # SCSI transfer count nonzero? 10074568Sgibbs test STCNT+1,0xff jnz sg_advance1 10084568Sgibbs test STCNT+2,0xff jnz sg_advance1 10094568Sgibbs 10104568Sgibbs clr SG_NOLOAD # reload s/g next time 10114568Sgibbs dec SG_COUNT # one less segment to go 10124568Sgibbs 10134568Sgibbs clr A # add sizeof(struct scatter) 10144568Sgibbs add SG_NEXT+0,SG_SIZEOF,SG_NEXT+0 10154568Sgibbs adc SG_NEXT+1,A,SG_NEXT+1 10164568Sgibbs adc SG_NEXT+2,A,SG_NEXT+2 10174568Sgibbs adc SG_NEXT+3,A,SG_NEXT+3 10184568Sgibbs 10194568Sgibbs ret 10204568Sgibbs 10214568Sgibbssg_advance1: 10224568Sgibbs mvi SG_NOLOAD,0x80 # don't reload s/g next time 10234568Sgibbssg_advance2: 10244568Sgibbs ret 10254568Sgibbs 10264568Sgibbs# Add the array base SYNCNEG to the target offset (the target address 10274568Sgibbs# is in SCSIID), and return the result in SINDEX. The accumulator 10284568Sgibbs# contains the 3->8 decoding of the target ID on return. 10294568Sgibbs# 10304568Sgibbsndx_sdtr: 10314568Sgibbs shr A,SCSIID,4 10324568Sgibbs and A,0x7 10334568Sgibbs add SINDEX,SYNCNEG,A 10344568Sgibbs 10354568Sgibbs and FUNCTION1,0x70,SCSIID # 3-bit target address decode 10364568Sgibbs mov A,FUNCTION1 ret 10374568Sgibbs 10384568Sgibbs# If we need to negotiate transfer parameters, build the SDTR message 10394568Sgibbs# starting at the address passed in SINDEX. DINDEX is modified on return. 10404568Sgibbs# 10414568Sgibbsmk_sdtr: 10424568Sgibbs mov DINDEX,SINDEX # save SINDEX 10434568Sgibbs 10444568Sgibbs call ndx_sdtr 10454568Sgibbs test NEEDSDTR,A jnz mk_sdtr1 # do we need negotiation? 10464568Sgibbs ret 10474568Sgibbs 10484568Sgibbsmk_sdtr1: 10494568Sgibbs mvi DINDIR,1 # extended message 10504568Sgibbs mvi DINDIR,3 # extended message length = 3 10514568Sgibbs mvi DINDIR,1 # SDTR code 10524568Sgibbs mvi DINDIR,25 # REQ/ACK transfer period 10534568Sgibbs mvi DINDIR,15 # REQ/ACK offset 10544568Sgibbs 10554568Sgibbs add MSG_LEN,-MSG_START+0,DINDEX # update message length 10564568Sgibbs ret 10574568Sgibbs 10584568Sgibbs# Set SCSI bus control signal state. This also saves the last-written 10594568Sgibbs# value into a location where the higher-level driver can read it - if 10604568Sgibbs# it has to send an ABORT or RESET message, then it needs to know this 10614568Sgibbs# so it can assert ATN without upsetting SCSISIGO. The new value is 10624568Sgibbs# expected in SINDEX. Change the actual state last to avoid contention 10634568Sgibbs# from the driver. 10644568Sgibbs# 10654568Sgibbsscsisig: 10664568Sgibbs mov SIGSTATE,SINDEX 10674568Sgibbs mov SCSISIGO,SINDEX ret 1068