aic7xxx.seq revision 21982
113177Sgibbs/*+M*********************************************************************** 213177Sgibbs *Adaptec 274x/284x/294x device driver for Linux and FreeBSD. 313177Sgibbs * 413177Sgibbs *Copyright (c) 1994 John Aycock 513177Sgibbs * The University of Calgary Department of Computer Science. 613177Sgibbs * All rights reserved. 713177Sgibbs * 815328Sgibbs *FreeBSD, Twin, Wide, 2 command per target support, tagged queuing, 915328Sgibbs *SCB paging and other optimizations: 1015328Sgibbs *Copyright (c) 1994, 1995, 1996 Justin Gibbs. All rights reserved. 1113177Sgibbs * 1213177Sgibbs *Redistribution and use in source and binary forms, with or without 1313177Sgibbs *modification, are permitted provided that the following conditions 1413177Sgibbs *are met: 1513177Sgibbs *1. Redistributions of source code must retain the above copyright 1613177Sgibbs * notice, this list of conditions, and the following disclaimer. 1713177Sgibbs *2. Redistributions in binary form must reproduce the above copyright 1813177Sgibbs * notice, this list of conditions and the following disclaimer in the 1913177Sgibbs * documentation and/or other materials provided with the distribution. 2013177Sgibbs *3. All advertising materials mentioning features or use of this software 2113177Sgibbs * must display the following acknowledgement: 2213177Sgibbs * This product includes software developed by the University of Calgary 2313177Sgibbs * Department of Computer Science and its contributors. 2413177Sgibbs *4. Neither the name of the University nor the names of its contributors 2513177Sgibbs * may be used to endorse or promote products derived from this software 2613177Sgibbs * without specific prior written permission. 2713177Sgibbs * 2813177Sgibbs *THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 2913177Sgibbs *ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 3013177Sgibbs *IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 3113177Sgibbs *ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 3213177Sgibbs *FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3313177Sgibbs *DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3413177Sgibbs *OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3513177Sgibbs *HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3613177Sgibbs *LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3713177Sgibbs *OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3813177Sgibbs *SUCH DAMAGE. 3913177Sgibbs * 4013177Sgibbs *-M************************************************************************/ 414568Sgibbs 4221673SjkhVERSION AIC7XXX_SEQ_VER "$FreeBSD: head/sys/dev/aic7xxx/aic7xxx.seq 21982 1997-01-24 21:57:47Z gibbs $" 435647Sgibbs 4415998Sgibbs#if defined(__NetBSD__) 4515998Sgibbs#include "../../../../dev/ic/aic7xxxreg.h" 4618762Sgibbs#include "../../../../scsi/scsi_message.h" 4715998Sgibbs#elif defined(__FreeBSD__) 4813177Sgibbs#include "../../dev/aic7xxx/aic7xxx_reg.h" 4918762Sgibbs#include "../../scsi/scsi_message.h" 5015998Sgibbs#endif 514568Sgibbs 5213177Sgibbs/* 5313177Sgibbs * We can't just use ACCUM in the sequencer code because it 5413177Sgibbs * must be treated specially by the assembler, and it currently 5513690Sgibbs * looks for the symbol 'A'. This is the only register defined in 5613177Sgibbs * the assembler's symbol space. 5713177Sgibbs */ 5813177SgibbsA = ACCUM 594568Sgibbs 6019164Sgibbs/* 6119164Sgibbs * A few words on the waiting SCB list: 6219164Sgibbs * After starting the selection hardware, we check for reconnecting targets 6313690Sgibbs * as well as for our selection to complete just in case the reselection wins 6413690Sgibbs * bus arbitration. The problem with this is that we must keep track of the 6513690Sgibbs * SCB that we've already pulled from the QINFIFO and started the selection 6613690Sgibbs * on just in case the reselection wins so that we can retry the selection at 6713690Sgibbs * a later time. This problem cannot be resolved by holding a single entry 6813690Sgibbs * in scratch ram since a reconnecting target can request sense and this will 6913690Sgibbs * create yet another SCB waiting for selection. The solution used here is to 7013690Sgibbs * use byte 27 of the SCB as a psuedo-next pointer and to thread a list 7119164Sgibbs * of SCBs that are awaiting selection. Since 0-0xfe are valid SCB indexes, 7219164Sgibbs * SCB_LIST_NULL is 0xff which is out of range. An entry is also added to 7319164Sgibbs * this list everytime a request sense occurs or after completing a non-tagged 7419164Sgibbs * command for which a second SCB has been queued. The sequencer will 7519164Sgibbs * automatically consume the entries. 7613177Sgibbs */ 774568Sgibbs 7813177Sgibbs/* 7914449Sgibbs * We assume that the kernel driver may reset us at any time, even in the 8014449Sgibbs * middle of a DMA, so clear DFCNTRL too. 8113177Sgibbs */ 8214449Sgibbsreset: 8314449Sgibbs clr DFCNTRL 8414449Sgibbs clr SCSISIGO /* De-assert BSY */ 8519921Sgibbs 8619921Sgibbsp_busfree: 8721947Sgibbs or SXFRCTL0, CLRCHN 8816198Sgibbs clr SCSIRATE /* 8916198Sgibbs * We don't know the target we will 9016198Sgibbs * connect to, so default to narrow 9116198Sgibbs * transfers to avoid parity problems. 9216198Sgibbs */ 9321947Sgibbs mvi SCSISEQ,ENRSELI /* Always allow reselection */ 9420117Sgibbs mvi LASTPHASE, P_BUSFREE 9520117Sgibbs and FLAGS,0x07 /* clear target specific flags */ 968104Sgibbspoll_for_work: 9713177Sgibbs /* 9813177Sgibbs * Are we a twin channel device? 9913177Sgibbs * For fairness, we check the other bus first, 10013177Sgibbs * since we just finished a transaction on the 10113177Sgibbs * current channel. 10213177Sgibbs */ 10313177Sgibbs test FLAGS,TWIN_BUS jz start2 10413177Sgibbs xor SBLKCTL,SELBUSB /* Toggle to the other bus */ 1058104Sgibbs test SSTAT0,SELDI jnz reselect 10613177Sgibbs xor SBLKCTL,SELBUSB /* Toggle to the original bus */ 1075326Sgibbsstart2: 1088104Sgibbs test SSTAT0,SELDI jnz reselect 10919164Sgibbs cmp WAITING_SCBH,SCB_LIST_NULL je test_queue 11019164Sgibbsstart_waiting: 11119164Sgibbs /* 11219164Sgibbs * Pull the first entry off of the waiting SCB list 11319164Sgibbs * We don't have to "test_busy" because only transactions that 11419164Sgibbs * have passed that test can be in the WAITING_SCB list. 11519164Sgibbs */ 11619164Sgibbs mov SCBPTR,WAITING_SCBH 11719164Sgibbs jmp start_scb2 11819164Sgibbstest_queue: 11919164Sgibbs /* Has the driver posted any work for us? */ 12014934Sgibbs mov A, QCNTMASK 12114934Sgibbs test QINCNT,A jz poll_for_work 1224568Sgibbs 12313690Sgibbs/* 12413690Sgibbs * We have at least one queued SCB now and we don't have any 12519164Sgibbs * SCBs in the list of SCBs awaiting selection. If we have 12619164Sgibbs * any SCBs availible for use, pull the tag from the QINFIFO 12719164Sgibbs * and get to work on it. 12813177Sgibbs */ 12919164Sgibbs test FLAGS, PAGESCBS jz dequeue_scb 13019623Sgibbs mov ALLZEROS call get_free_or_disc_scb 13119164Sgibbs cmp SINDEX, SCB_LIST_NULL je poll_for_work 13219164Sgibbsdequeue_scb: 13319164Sgibbs mov CUR_SCBID,QINFIFO 13419164Sgibbs test FLAGS, PAGESCBS jnz dma_queued_scb 13519164Sgibbs /* In the non-paging case, the SCBID == hardware SCB index */ 13619164Sgibbs mov SCBPTR, CUR_SCBID 13719164Sgibbsdma_queued_scb: 13819164Sgibbs/* 13919164Sgibbs * DMA the SCB from host ram into the current SCB location. 14019164Sgibbs */ 14119164Sgibbs mvi DMAPARAMS, 0xd /* HDMAEN|DIRECTION|FIFORESET */ 14219164Sgibbs mov CUR_SCBID call dma_scb 1434568Sgibbs 14413177Sgibbs/* 14513177Sgibbs * See if there is not already an active SCB for this target. This code 14613177Sgibbs * locks out on a per target basis instead of target/lun. Although this 14713177Sgibbs * is not ideal for devices that have multiple luns active at the same 14813177Sgibbs * time, it is faster than looping through all SCB's looking for active 14919921Sgibbs * commands. We also don't have enough spare SCB space for us to store the 15019164Sgibbs * SCBID of the currently busy transaction for each target/lun making it 15119164Sgibbs * impossible to link up the SCBs. 15213177Sgibbs */ 1535647Sgibbstest_busy: 15419164Sgibbs test SCB_CONTROL, TAG_ENB jnz start_scb 15519164Sgibbs mov SAVED_SCBPTR, SCBPTR 15619218Sgibbs mov SCB_TCL call index_untagged_scb 15721947Sgibbs mvi SEQCTL,0x50 /* PAUSEDIS|FASTMODE */ 15819164Sgibbs mov ARG_1, SINDIR /* 15919164Sgibbs * ARG_1 should 16019164Sgibbs * now have the SCB ID of 16119164Sgibbs * any active, non-tagged, 16219164Sgibbs * command for this target. 16319164Sgibbs */ 16419164Sgibbs cmp ARG_1, SCB_LIST_NULL je make_busy 16519164Sgibbs test FLAGS, PAGESCBS jz simple_busy_link 16619164Sgibbs /* 16719164Sgibbs * Put this SCB back onto the free list. It 16819164Sgibbs * may be necessary to satisfy the search for 16919164Sgibbs * the active SCB. 17019164Sgibbs */ 17119218Sgibbs mov SCBPTR, SAVED_SCBPTR 17219164Sgibbs call add_scb_to_free_list 17319164Sgibbs /* Find the active SCB */ 17419164Sgibbs mov ALLZEROS call findSCB 17519218Sgibbs /* 17619218Sgibbs * If we couldn't find it, tell the kernel. This should 17721947Sgibbs * never happen. 17819218Sgibbs */ 17919218Sgibbs cmp SINDEX, SCB_LIST_NULL jne paged_busy_link 18019218Sgibbs mvi INTSTAT, NO_MATCH_BUSY 18119218Sgibbspaged_busy_link: 18219164Sgibbs /* Link us in */ 18319164Sgibbs mov SCB_LINKED_NEXT, CUR_SCBID 18419164Sgibbs /* Put it back on the disconnected list */ 18519164Sgibbs call add_scb_to_disc_list 18621947Sgibbs mvi SEQCTL,0x10 /* FASTMODE */ 1878104Sgibbs jmp poll_for_work 18819164Sgibbssimple_busy_link: 18919164Sgibbs mov SCBPTR, ARG_1 19019164Sgibbs mov SCB_LINKED_NEXT, CUR_SCBID 19121947Sgibbs mvi SEQCTL,0x10 /* FASTMODE */ 19219164Sgibbs jmp poll_for_work 19319164Sgibbsmake_busy: 19421947Sgibbs mvi SEQCTL,0x10 /* FASTMODE */ 19519164Sgibbs mov DINDIR, CUR_SCBID 19619164Sgibbs mov SCBPTR, SAVED_SCBPTR 1974568Sgibbs 1985326Sgibbsstart_scb: 19919164Sgibbs /* 20019164Sgibbs * Place us on the waiting list in case our selection 20119164Sgibbs * doesn't win during bus arbitration. 20219164Sgibbs */ 20315328Sgibbs mov SCB_NEXT,WAITING_SCBH 20413177Sgibbs mov WAITING_SCBH, SCBPTR 20513177Sgibbsstart_scb2: 20613177Sgibbs and SINDEX,0xf7,SBLKCTL /* Clear the channel select bit */ 20713177Sgibbs and A,0x08,SCB_TCL /* Get new channel bit */ 20813177Sgibbs or SINDEX,A 20913177Sgibbs mov SBLKCTL,SINDEX /* select channel */ 21013177Sgibbs mov SCB_TCL call initialize_scsiid 2118104Sgibbs 21213177Sgibbs/* 21313177Sgibbs * Enable selection phase as an initiator, and do automatic ATN 21413177Sgibbs * after the selection. We do this now so that we can overlap the 21513177Sgibbs * rest of our work to set up this target with the arbitration and 21613177Sgibbs * selection bus phases. 21713177Sgibbs */ 2188104Sgibbsstart_selection: 21913177Sgibbs mvi SCSISEQ,0x58 /* ENSELO|ENAUTOATNO|ENRSELI */ 2204568Sgibbs 22113177Sgibbs/* 22213177Sgibbs * As soon as we get a successful selection, the target should go 22313177Sgibbs * into the message out phase since we have ATN asserted. Prepare 22413177Sgibbs * the message to send. 22513177Sgibbs * 22613177Sgibbs * Messages are stored in scratch RAM starting with a length byte 22713177Sgibbs * followed by the message itself. 22813177Sgibbs */ 2298567Sdg 23013177Sgibbsmk_identify: 23119164Sgibbs and MSG0,0x7,SCB_TCL /* lun */ 23213177Sgibbs and A,DISCENB,SCB_CONTROL /* mask off disconnect privledge */ 23313690Sgibbs or MSG0,A /* or in disconnect privledge */ 23418762Sgibbs or MSG0,MSG_IDENTIFYFLAG 23513690Sgibbs mvi MSG_LEN, 1 2364568Sgibbs 23713177Sgibbs/* 23815328Sgibbs * Send a tag message if TAG_ENB is set in the SCB control block. 23915328Sgibbs * Use SCB_TAG (the position in the kernel's SCB array) as the tag value. 24013177Sgibbs */ 2416608Sgibbsmk_tag: 24218762Sgibbs test SCB_CONTROL,TAG_ENB jz mk_message 24319164Sgibbs and MSG1,0x23,SCB_CONTROL 24419164Sgibbs mov MSG2,SCB_TAG 24519164Sgibbs add MSG_LEN,2 /* update message length */ 2466608Sgibbs 24718762Sgibbs/* 24818762Sgibbs * Interrupt the driver, and allow it to tweak the message buffer 24918762Sgibbs * if it asks. 25018762Sgibbs */ 25118762Sgibbsmk_message: 25218762Sgibbs test SCB_CONTROL,MK_MESSAGE jz wait_for_selection 2536608Sgibbs 25418762Sgibbs mvi INTSTAT,AWAITING_MSG 2556608Sgibbs 2569917Sgibbswait_for_selection: 25713177Sgibbs test SSTAT0,SELDO jnz select 25813177Sgibbs test SSTAT0,SELDI jz wait_for_selection 2594568Sgibbs 26013177Sgibbs/* 26113177Sgibbs * Reselection has been initiated by a target. Make a note that we've been 26219164Sgibbs * reselected, but haven't seen an IDENTIFY message from the target yet. 26313177Sgibbs */ 2644568Sgibbsreselect: 26513177Sgibbs clr MSG_LEN /* Don't have anything in the mesg buffer */ 26621947Sgibbs /* XXX test for and handle ONE BIT condition */ 26721947Sgibbs and SAVED_TCL, 0xf0, SELID 26813177Sgibbs or FLAGS,RESELECTED 26913177Sgibbs jmp select2 2704568Sgibbs 27113177Sgibbs/* 27219164Sgibbs * After the selection, remove this SCB from the "waiting SCB" 27313177Sgibbs * list. This is achieved by simply moving our "next" pointer into 27413177Sgibbs * WAITING_SCBH. Our next pointer will be set to null the next time this 27513177Sgibbs * SCB is used, so don't bother with it now. 27613177Sgibbs */ 2778104Sgibbsselect: 27815328Sgibbs mov WAITING_SCBH,SCB_NEXT 2798104Sgibbsselect2: 28021947Sgibbs /* Turn off the selection hardware */ 28121947Sgibbs mvi SCSISEQ,ENAUTOATNP /* 28221947Sgibbs * ATN on parity errors 28321947Sgibbs * for "in" phases 28421947Sgibbs */ 28521947Sgibbs mvi CLRSINT0,0x60 /* CLRSELDI|CLRSELDO */ 28621947Sgibbs mvi CLRSINT1,CLRBUSFREE 28721947Sgibbs or SIMODE1, ENBUSFREE /* 28821947Sgibbs * We aren't expecting a 28921947Sgibbs * bus free, so interrupt 29021947Sgibbs * the kernel driver if it 29121947Sgibbs * happens. 29221947Sgibbs */ 29313177Sgibbs/* 29413177Sgibbs * Initialize SCSIRATE with the appropriate value for this target. 29519164Sgibbs * The SCSIRATE settings for each target are stored in an array 29619164Sgibbs * based at TARG_SCRATCH. 29713177Sgibbs */ 29819164Sgibbsndx_dtr: 29921947Sgibbs shr A,SAVED_TCL,4 30019164Sgibbs test SBLKCTL,SELBUSB jz ndx_dtr_2 30119164Sgibbs or SAVED_TCL, SELBUSB /* Add the channel bit while we're here */ 30219164Sgibbs or A,0x08 /* Channel B entries add 8 */ 30319164Sgibbsndx_dtr_2: 30419164Sgibbs add SINDEX,TARG_SCRATCH,A 30513177Sgibbs mov SCSIRATE,SINDIR 30613177Sgibbs 30715843Sgibbs/* 30819164Sgibbs * Initialize Ultra mode setting and clear the SCSI channel. 30915843Sgibbs */ 31019164Sgibbsultra: 31119164Sgibbs and DINDEX,0xdf,SXFRCTL0 /* default to Ultra disabled */ 31219164Sgibbs mvi SINDEX, ULTRA_ENB_B 31321947Sgibbs test SAVED_TCL, 0x80 jnz ultra_2 /* Target ID > 7 */ 31419164Sgibbs test SBLKCTL, SELBUSB jnz ultra_2 /* Second channel device */ 31519164Sgibbs dec SINDEX 31619164Sgibbsultra_2: 31721947Sgibbs mov FUNCTION1,SAVED_TCL 31819164Sgibbs mov A,FUNCTION1 31919164Sgibbs test SINDIR, A jz set_sxfrctl0 32019164Sgibbs or DINDEX, ULTRAEN 32119164Sgibbs 32215843Sgibbsset_sxfrctl0: 32319164Sgibbs mov SXFRCTL0,DINDEX 32415843Sgibbs 32513177Sgibbs/* 32613177Sgibbs * Main loop for information transfer phases. If BSY is false, then 32713177Sgibbs * we have a bus free condition, expected or not. Otherwise, wait 32813177Sgibbs * for the target to assert REQ before checking MSG, C/D and I/O 32913177Sgibbs * for the bus phase. 33013177Sgibbs * 33113177Sgibbs */ 3324568SgibbsITloop: 33313177Sgibbs test SSTAT1,BUSFREE jnz p_busfree 33413177Sgibbs test SSTAT1,REQINIT jz ITloop 3354568Sgibbs 33613177Sgibbs and A,PHASE_MASK,SCSISIGI 33713690Sgibbs mov LASTPHASE,A 33813690Sgibbs mov SCSISIGO,A 3394568Sgibbs 3404568Sgibbs cmp ALLZEROS,A je p_dataout 34113177Sgibbs cmp A,P_DATAIN je p_datain 34213177Sgibbs cmp A,P_COMMAND je p_command 34313177Sgibbs cmp A,P_MESGOUT je p_mesgout 34413177Sgibbs cmp A,P_STATUS je p_status 34513177Sgibbs cmp A,P_MESGIN je p_mesgin 3464568Sgibbs 34713177Sgibbs mvi INTSTAT,BAD_PHASE /* unknown phase - signal driver */ 34815843Sgibbs jmp ITloop /* Try reading the bus again. */ 3494568Sgibbs 3504568Sgibbsp_dataout: 35113177Sgibbs mvi DMAPARAMS,0x7d /* 35213177Sgibbs * WIDEODD|SCSIEN|SDMAEN|HDMAEN| 35313177Sgibbs * DIRECTION|FIFORESET 35413177Sgibbs */ 3559928Sgibbs jmp data_phase_init 3564568Sgibbs 35713177Sgibbs/* 35813177Sgibbs * If we re-enter the data phase after going through another phase, the 35913177Sgibbs * STCNT may have been cleared, so restore it from the residual field. 36013177Sgibbs */ 3619928Sgibbsdata_phase_reinit: 36219231Sgibbs mvi DINDEX, STCNT0 36319231Sgibbs mvi SCB_RESID_DCNT0 call bcopy_3 3649928Sgibbs jmp data_phase_loop 3654568Sgibbs 3669928Sgibbsp_datain: 36713177Sgibbs mvi DMAPARAMS,0x79 /* 36813177Sgibbs * WIDEODD|SCSIEN|SDMAEN|HDMAEN| 36913177Sgibbs * !DIRECTION|FIFORESET 37013177Sgibbs */ 3719928Sgibbsdata_phase_init: 37219164Sgibbs call assert /* 37319164Sgibbs * Ensure entering a data 37419164Sgibbs * phase is okay - seen identify, etc. 37519164Sgibbs */ 3765775Sgibbs 3779928Sgibbs test FLAGS, DPHASE jnz data_phase_reinit 3784568Sgibbs 37919164Sgibbs /* 38019164Sgibbs * Initialize the DMA address and counter from the SCB. 38119164Sgibbs * Also set SG_COUNT and SG_NEXT in memory since we cannot 38219164Sgibbs * modify the values in the SCB itself until we see a 38319164Sgibbs * save data pointers message. 38419164Sgibbs */ 38519164Sgibbs mvi DINDEX, HADDR0 38619164Sgibbs mvi SCB_DATAPTR call bcopy_7 38719164Sgibbs 38819164Sgibbs call set_stcnt_from_hcnt 38919164Sgibbs 39019164Sgibbs mov SG_COUNT,SCB_SGCOUNT 39119164Sgibbs 39219164Sgibbs mvi DINDEX, SG_NEXT 39319164Sgibbs mvi SCB_SGPTR call bcopy_4 39419164Sgibbs 39519164Sgibbs /* We have seen a data phase */ 39619164Sgibbs or FLAGS, DPHASE 39719164Sgibbs 3989928Sgibbsdata_phase_loop: 39916260Sgibbs/* Guard against overruns */ 40016260Sgibbs test SG_COUNT, 0xff jnz data_phase_inbounds 40116260Sgibbs/* 40216260Sgibbs * Turn on 'Bit Bucket' mode, set the transfer count to 40316260Sgibbs * 16meg and let the target run until it changes phase. 40416260Sgibbs * When the transfer completes, notify the host that we 40516260Sgibbs * had an overrun. 40616260Sgibbs */ 40716260Sgibbs or SXFRCTL1,BITBUCKET 40819921Sgibbs and DMAPARAMS, 0xf7 /* Turn off HDMAEN */ 40916260Sgibbs mvi STCNT0,0xff 41016260Sgibbs mvi STCNT1,0xff 41116260Sgibbs mvi STCNT2,0xff 41216260Sgibbs 41316260Sgibbsdata_phase_inbounds: 41419164Sgibbs/* If we are the last SG block, ensure wideodd is off. */ 4159928Sgibbs cmp SG_COUNT,0x01 jne data_phase_wideodd 41613177Sgibbs and DMAPARAMS, 0xbf /* Turn off WIDEODD */ 4179928Sgibbsdata_phase_wideodd: 4189928Sgibbs mov DMAPARAMS call dma 4194568Sgibbs 42016260Sgibbs/* Go tell the host about any overruns */ 42116260Sgibbs test SXFRCTL1,BITBUCKET jnz data_phase_overrun 42216260Sgibbs 42313177Sgibbs/* Exit if we had an underrun */ 42413177Sgibbs test SSTAT0,SDONE jz data_phase_finish /* underrun STCNT != 0 */ 4257532Sgibbs 42613177Sgibbs/* 42713177Sgibbs * Advance the scatter-gather pointers if needed 42813177Sgibbs */ 4299928Sgibbssg_advance: 43013177Sgibbs dec SG_COUNT /* one less segment to go */ 4314568Sgibbs 43213177Sgibbs test SG_COUNT, 0xff jz data_phase_finish /* Are we done? */ 4334568Sgibbs 43413177Sgibbs clr A /* add sizeof(struct scatter) */ 43513177Sgibbs add SG_NEXT0,SG_SIZEOF,SG_NEXT0 43613177Sgibbs adc SG_NEXT1,A,SG_NEXT1 4374568Sgibbs 43813177Sgibbs/* 43913177Sgibbs * Load a struct scatter and set up the data address and length. 44013177Sgibbs * If the working value of the SG count is nonzero, then 44113177Sgibbs * we need to load a new set of values. 44213177Sgibbs * 44315328Sgibbs * This, like all DMA's, assumes little-endian host data storage. 44413177Sgibbs */ 4459928Sgibbssg_load: 44613177Sgibbs clr HCNT2 44713177Sgibbs clr HCNT1 44813177Sgibbs mvi HCNT0,SG_SIZEOF 4494568Sgibbs 45019164Sgibbs mvi DINDEX, HADDR0 45119164Sgibbs mvi SG_NEXT0 call bcopy_4 4524568Sgibbs 45313690Sgibbs or DFCNTRL,0xd /* HDMAEN|DIRECTION|FIFORESET */ 4549928Sgibbs 45519164Sgibbs call dma_finish 4569928Sgibbs 45713177Sgibbs/* 45813177Sgibbs * Copy data from FIFO into SCB data pointer and data count. This assumes 45919164Sgibbs * that the SG segments are of the form: 46013177Sgibbs * 46113177Sgibbs * struct ahc_dma_seg { 46219164Sgibbs * u_int32_t addr; four bytes, little-endian order 46319164Sgibbs * u_int32_t len; four bytes, little endian order 46413177Sgibbs * }; 46513177Sgibbs */ 46619164Sgibbs mvi HADDR0 call dfdat_in_7 4679928Sgibbs 46813177Sgibbs/* Load STCNT as well. It is a mirror of HCNT */ 46919164Sgibbs call set_stcnt_from_hcnt 47019164Sgibbs test SSTAT1,PHASEMIS jz data_phase_loop 4714568Sgibbs 4729928Sgibbsdata_phase_finish: 47313177Sgibbs/* 47413177Sgibbs * After a DMA finishes, save the SG and STCNT residuals back into the SCB 47513177Sgibbs * We use STCNT instead of HCNT, since it's a reflection of how many bytes 47613177Sgibbs * were transferred on the SCSI (as opposed to the host) bus. 47713177Sgibbs */ 47813690Sgibbs mov SCB_RESID_DCNT0,STCNT0 47913690Sgibbs mov SCB_RESID_DCNT1,STCNT1 48013690Sgibbs mov SCB_RESID_DCNT2,STCNT2 48113177Sgibbs mov SCB_RESID_SGCNT, SG_COUNT 4824568Sgibbs jmp ITloop 4834568Sgibbs 48416260Sgibbsdata_phase_overrun: 48513177Sgibbs/* 48616260Sgibbs * Turn off BITBUCKET mode and notify the host 48716260Sgibbs */ 48816260Sgibbs and SXFRCTL1,0x7f /* ~BITBUCKET */ 48916260Sgibbs mvi INTSTAT,DATA_OVERRUN 49016260Sgibbs jmp ITloop 49116260Sgibbs 49216260Sgibbs/* 49315328Sgibbs * Command phase. Set up the DMA registers and let 'er rip. 49413177Sgibbs */ 4954568Sgibbsp_command: 4964568Sgibbs call assert 4974568Sgibbs 49813177Sgibbs/* 49915328Sgibbs * Load HADDR and HCNT. 50013177Sgibbs */ 50119164Sgibbs mvi DINDEX, HADDR0 50219164Sgibbs mvi SCB_CMDPTR call bcopy_5 50313690Sgibbs clr HCNT1 50413690Sgibbs clr HCNT2 5054568Sgibbs 50619164Sgibbs call set_stcnt_from_hcnt 5074568Sgibbs 50821982Sgibbs mvi DFCNTRL, 0x3d /* SCSIEN|SDMAEN|HDMAEN 50921982Sgibbs * |DIRECTION|FIFORESET 51021982Sgibbs */ 51121982Sgibbsp_command_dma: 51221982Sgibbs test SSTAT0, SDONE jnz p_command_dma_done 51321982Sgibbs test SSTAT1, PHASEMIS jz p_command_dma 51421982Sgibbs test SSTAT0, SDONE jnz p_command_dma_done 51521982Sgibbs clr DFCNTRL 5164568Sgibbs jmp ITloop 51721982Sgibbsp_command_dma_done: 51821982Sgibbs and DFCNTRL, 0xc7 /* ~(SCSIEN|SDMAEN|HDMAEN) */ 51921982Sgibbsp_command_dma_clear: 52021982Sgibbs test DFCNTRL, 0x38 jnz p_command_dma_clear 52121982Sgibbs jmp ITloop 5224568Sgibbs 52313177Sgibbs/* 52413177Sgibbs * Status phase. Wait for the data byte to appear, then read it 52513177Sgibbs * and store it into the SCB. 52613177Sgibbs */ 5274568Sgibbsp_status: 52819803Sgibbs call assert 52919803Sgibbs 53021947Sgibbs mov SCB_TARGET_STATUS, SCSIDATL 53121947Sgibbs jmp ITloop 5324568Sgibbs 53313177Sgibbs/* 53415328Sgibbs * Message out phase. If there is not an active message, but the target 53513177Sgibbs * took us into this phase anyway, build a no-op message and send it. 53613177Sgibbs */ 5374568Sgibbsp_mesgout: 53813177Sgibbs test MSG_LEN, 0xff jnz p_mesgout_start 53918762Sgibbs mvi MSG_NOOP call mk_mesg /* build NOP message */ 54013177Sgibbsp_mesgout_start: 54113177Sgibbs/* 54213177Sgibbs * Set up automatic PIO transfer from MSG0. Bit 3 in 54313177Sgibbs * SXFRCTL0 (SPIOEN) is already on. 54413177Sgibbs */ 54513177Sgibbs mvi SINDEX,MSG0 5464568Sgibbs mov DINDEX,MSG_LEN 5474568Sgibbs 54813177Sgibbs/* 54913177Sgibbs * When target asks for a byte, drop ATN if it's the last one in 55013177Sgibbs * the message. Otherwise, keep going until the message is exhausted. 55113177Sgibbs * 55213177Sgibbs * Keep an eye out for a phase change, in case the target issues 55313177Sgibbs * a MESSAGE REJECT. 55413177Sgibbs */ 55513177Sgibbsp_mesgout_loop: 55621947Sgibbs /* 55721947Sgibbs * If there is a parity error, wait for the kernel to 55821947Sgibbs * see the interrupt and "update" our message response 55921947Sgibbs * before continuing. 56021947Sgibbs */ 56121947Sgibbs test SSTAT1, REQINIT jz p_mesgout_loop 56221947Sgibbs test SSTAT1, SCSIPERR jnz p_mesgout_loop 56321947Sgibbs and LASTPHASE, PHASE_MASK, SCSISIGI 56421947Sgibbs cmp LASTPHASE, P_MESGOUT jne p_mesgout_done 56513177Sgibbs/* 56613177Sgibbs * If the next bus phase after ATN drops is a message out, it means 56713177Sgibbs * that the target is requesting that the last message(s) be resent. 56813177Sgibbs */ 56919921Sgibbsp_mesgout_testretry: 57020117Sgibbs test DINDEX,0xff jnz p_mesgout_dropatn 57121947Sgibbs or SCSISIGO,ATNO,LASTPHASE /* turn on ATN for the retry */ 57219906Sgibbs jmp p_mesgout_start 57320117Sgibbsp_mesgout_dropatn: 57420117Sgibbs cmp DINDEX,1 jne p_mesgout_outb /* last byte? */ 57520117Sgibbs mvi CLRSINT1,CLRATNO /* drop ATN */ 57619906Sgibbsp_mesgout_outb: 57719906Sgibbs dec DINDEX 57819906Sgibbs mvi CLRSINT0, CLRSPIORDY 57919906Sgibbs mov SCSIDATL,SINDIR 58019906Sgibbs jmp p_mesgout_loop 5814568Sgibbs 58219906Sgibbsp_mesgout_done: 58315328Sgibbs mvi CLRSINT1,CLRATNO /* Be sure to turn ATNO off */ 58413177Sgibbs clr MSG_LEN /* no active msg */ 5854568Sgibbs jmp ITloop 5864568Sgibbs 58713177Sgibbs/* 58813177Sgibbs * Message in phase. Bytes are read using Automatic PIO mode. 58913177Sgibbs */ 5904568Sgibbsp_mesgin: 59113177Sgibbs mvi A call inb_first /* read the 1st message byte */ 59213177Sgibbs mov REJBYTE,A /* save it for the driver */ 5934568Sgibbs 59418762Sgibbs test A,MSG_IDENTIFYFLAG jnz mesgin_identify 59513177Sgibbs cmp A,MSG_DISCONNECT je mesgin_disconnect 59618762Sgibbs cmp A,MSG_SAVEDATAPOINTER je mesgin_sdptrs 59713177Sgibbs cmp ALLZEROS,A je mesgin_complete 59818762Sgibbs cmp A,MSG_RESTOREPOINTERS je mesgin_rdptrs 59913177Sgibbs cmp A,MSG_EXTENDED je mesgin_extended 60018762Sgibbs cmp A,MSG_MESSAGE_REJECT je mesgin_reject 6014568Sgibbs 6029954Sgibbsrej_mesgin: 60313177Sgibbs/* 60419164Sgibbs * We have no idea what this message in is, so we issue a message reject 60519164Sgibbs * and hope for the best. In any case, rejection should be a rare 60619164Sgibbs * occurrence - signal the driver when it happens. 60713177Sgibbs */ 60813177Sgibbs mvi INTSTAT,SEND_REJECT /* let driver know */ 6099954Sgibbs 61018762Sgibbs mvi MSG_MESSAGE_REJECT call mk_mesg 6119954Sgibbs 6129954Sgibbsmesgin_done: 61313177Sgibbs call inb_last /*ack & turn auto PIO back on*/ 6149954Sgibbs jmp ITloop 6159954Sgibbs 6169954Sgibbs 6179954Sgibbsmesgin_complete: 61813177Sgibbs/* 61919164Sgibbs * We got a "command complete" message, so put the SCB_TAG into the QOUTFIFO, 62019164Sgibbs * and trigger a completion interrupt. Before doing so, check to see if there 62119164Sgibbs * is a residual or the status byte is something other than NO_ERROR (0). In 62219164Sgibbs * either of these conditions, we upload the SCB back to the host so it can 62319164Sgibbs * process this information. In the case of a non zero status byte, we 62419164Sgibbs * additionally interrupt the kernel driver synchronously, allowing it to 62519164Sgibbs * decide if sense should be retrieved. If the kernel driver wishes to request 62619164Sgibbs * sense, it will fill the kernel SCB with a request sense command and set 62719164Sgibbs * RETURN_1 to SEND_SENSE. If RETURN_1 is set to SEND_SENSE we redownload 62819164Sgibbs * the SCB, and process it as the next command by adding it to the waiting list. 62919164Sgibbs * If the kernel driver does not wish to request sense, it need only clear 63019164Sgibbs * RETURN_1, and the command is allowed to complete normally. We don't bother 63119164Sgibbs * to post to the QOUTFIFO in the error cases since it would require extra 63219164Sgibbs * work in the kernel driver to ensure that the entry was removed before the 63319164Sgibbs * command complete code tried processing it. 63413177Sgibbs */ 63519164Sgibbs 63613177Sgibbs/* 63719921Sgibbs * We expect to go to bus free after this message. 63819921Sgibbs */ 63919921Sgibbs and SIMODE1, 0xf7 /* ~ENBUSFREE */ 64019921Sgibbs/* 64119164Sgibbs * First check for residuals 64213177Sgibbs */ 64319164Sgibbs test SCB_RESID_SGCNT,0xff jnz upload_scb 64419164Sgibbs test SCB_TARGET_STATUS,0xff jz status_ok /* Good Status? */ 64519164Sgibbsupload_scb: 64619164Sgibbs mvi DMAPARAMS, 0x9 /* HDMAEN | FIFORESET*/ 64719164Sgibbs mov SCB_TAG call dma_scb 6487532Sgibbscheck_status: 64919164Sgibbs test SCB_TARGET_STATUS,0xff jz status_ok /* Just a residual? */ 65013177Sgibbs mvi INTSTAT,BAD_STATUS /* let driver know */ 65113177Sgibbs cmp RETURN_1, SEND_SENSE jne status_ok 65219164Sgibbs /* This SCB becomes the next to execute as it will retrieve sense */ 65319164Sgibbs mov SCB_LINKED_NEXT, SCB_TAG 65419164Sgibbs jmp dma_next_scb 6555326Sgibbs 6564568Sgibbsstatus_ok: 65713177Sgibbs/* First, mark this target as free. */ 65819921Sgibbs test SCB_CONTROL,TAG_ENB jnz complete /* 65913177Sgibbs * Tagged commands 66013177Sgibbs * don't busy the 66113177Sgibbs * target. 66213177Sgibbs */ 66319164Sgibbs mov SAVED_SCBPTR, SCBPTR 66419164Sgibbs mov SAVED_LINKPTR, SCB_LINKED_NEXT 66519218Sgibbs mov SCB_TCL call index_untagged_scb 66619164Sgibbs mov DINDIR, SAVED_LINKPTR 66719164Sgibbs mov SCBPTR, SAVED_SCBPTR 6685326Sgibbs 6695326Sgibbscomplete: 67019164Sgibbs /* Post the SCB and issue an interrupt */ 67115328Sgibbs mov QOUTFIFO,SCB_TAG 6727532Sgibbs mvi INTSTAT,CMDCMPLT 67319164Sgibbs 67419164Sgibbsdma_next_scb: 67519921Sgibbs cmp SCB_LINKED_NEXT, SCB_LIST_NULL je add_to_free_list 67619164Sgibbs test FLAGS, PAGESCBS jnz dma_next_scb2 67719164Sgibbs /* Only DMA on top of ourselves if we are the SCB to download */ 67819164Sgibbs mov A, SCB_LINKED_NEXT 67919164Sgibbs cmp SCB_TAG, A je dma_next_scb2 68019164Sgibbs mov SCBPTR, A 68119164Sgibbs jmp add_to_waiting_list 68219164Sgibbsdma_next_scb2: 68319164Sgibbs mvi DMAPARAMS, 0xd /* HDMAEN|DIRECTION|FIFORESET */ 68419218Sgibbs mov SCB_LINKED_NEXT call dma_scb 68519164Sgibbsadd_to_waiting_list: 68619164Sgibbs mov SCB_NEXT,WAITING_SCBH 68719164Sgibbs mov WAITING_SCBH, SCBPTR 6889954Sgibbs jmp mesgin_done 68919921Sgibbsadd_to_free_list: 69019921Sgibbs call add_scb_to_free_list 69119921Sgibbs jmp mesgin_done 6924568Sgibbs 69313177Sgibbs/* 69418762Sgibbs * Is it an extended message? Copy the message to our message buffer and 69518762Sgibbs * notify the host. The host will tell us whether to reject this message, 69618762Sgibbs * respond to it with the message that the host placed in our message buffer, 69718762Sgibbs * or simply to do nothing. 69813177Sgibbs */ 6999954Sgibbsmesgin_extended: 70018762Sgibbs mvi MSGIN_EXT_LEN call inb_next 70118762Sgibbs mov A, MSGIN_EXT_LEN 70218762Sgibbsmesgin_extended_loop: 70319164Sgibbs mov DINDEX call inb_next 70418762Sgibbs dec A 70519164Sgibbs cmp DINDEX, MSGIN_EXT_LASTBYTE jne mesgin_extended_loop_test 70619164Sgibbs dec DINDEX /* dump by repeatedly filling the last byte */ 70719164Sgibbsmesgin_extended_loop_test: 70819164Sgibbs test A, 0xFF jnz mesgin_extended_loop 70918762Sgibbsmesgin_extended_intr: 71018762Sgibbs mvi INTSTAT,EXTENDED_MSG /* let driver know */ 71118762Sgibbs cmp RETURN_1,SEND_REJ je rej_mesgin 71218762Sgibbs cmp RETURN_1,SEND_MSG jne mesgin_done 71318762Sgibbs/* The kernel has setup a message to be sent */ 71421947Sgibbs or SCSISIGO,ATNO,LASTPHASE /* turn on ATNO */ 7159954Sgibbs jmp mesgin_done 7165562Sgibbs 71713177Sgibbs/* 71813177Sgibbs * Is it a disconnect message? Set a flag in the SCB to remind us 71913177Sgibbs * and await the bus going free. 72013177Sgibbs */ 7219954Sgibbsmesgin_disconnect: 72219921Sgibbs and SIMODE1, 0xf7 /* ~ENBUSFREE */ 72313177Sgibbs or SCB_CONTROL,DISCONNECTED 72415328Sgibbs test FLAGS, PAGESCBS jz mesgin_done 72519164Sgibbs call add_scb_to_disc_list 72619164Sgibbs jmp mesgin_done 72719164Sgibbs 72815328Sgibbs/* 72919164Sgibbs * Save data pointers message: 73019164Sgibbs * Copying RAM values back to SCB, for Save Data Pointers message, but 73119164Sgibbs * only if we've actually been into a data phase to change them. This 73219164Sgibbs * protects against bogus data in scratch ram and the residual counts 73319164Sgibbs * since they are only initialized when we go into data_in or data_out. 73415328Sgibbs */ 73519164Sgibbsmesgin_sdptrs: 73619164Sgibbs test FLAGS, DPHASE jz mesgin_done 73719164Sgibbs mov SCB_SGCOUNT,SG_COUNT 7384568Sgibbs 73919164Sgibbs /* The SCB SGPTR becomes the next one we'll download */ 74019164Sgibbs mvi DINDEX, SCB_SGPTR 74119164Sgibbs mvi SG_NEXT0 call bcopy_4 74219164Sgibbs 74319164Sgibbs /* The SCB DATAPTR0 becomes the current SHADDR */ 74419164Sgibbs mvi DINDEX, SCB_DATAPTR0 74519164Sgibbs mvi SHADDR0 call bcopy_4 74619164Sgibbs 74713177Sgibbs/* 74819164Sgibbs * Use the residual number since STCNT is corrupted by any message transfer. 74913177Sgibbs */ 75019164Sgibbs mvi SCB_RESID_DCNT0 call bcopy_3 75119164Sgibbs 7529954Sgibbs jmp mesgin_done 7534568Sgibbs 75413177Sgibbs/* 75513177Sgibbs * Restore pointers message? Data pointers are recopied from the 75613177Sgibbs * SCB anytime we enter a data phase for the first time, so all 75713177Sgibbs * we need to do is clear the DPHASE flag and let the data phase 75813177Sgibbs * code do the rest. 75913177Sgibbs */ 7609954Sgibbsmesgin_rdptrs: 76115328Sgibbs and FLAGS,0xef /* 76213177Sgibbs * !DPHASE we'll reload them 76313177Sgibbs * the next time through 76413177Sgibbs */ 7659954Sgibbs jmp mesgin_done 7664568Sgibbs 76713177Sgibbs/* 76813177Sgibbs * Identify message? For a reconnecting target, this tells us the lun 76913177Sgibbs * that the reconnection is for - find the correct SCB and switch to it, 77013177Sgibbs * clearing the "disconnected" bit so we don't "find" it by accident later. 77113177Sgibbs */ 7729954Sgibbsmesgin_identify: 77313177Sgibbs test A,0x78 jnz rej_mesgin /*!DiscPriv|!LUNTAR|!Reserved*/ 77413177Sgibbs and A,0x07 /* lun in lower three bits */ 77519164Sgibbs or SAVED_TCL,A /* SAVED_TCL should be complete now */ 77613177Sgibbs call inb_last /* ACK */ 77713177Sgibbs 77813177Sgibbs/* 77913177Sgibbs * Here we "snoop" the bus looking for a SIMPLE QUEUE TAG message. 78015328Sgibbs * If we get one, we use the tag returned to switch to find the proper 78115328Sgibbs * SCB. With SCB paging, this requires using findSCB for both tagged 78215328Sgibbs * and non-tagged transactions since the SCB may exist in any slot. 78315328Sgibbs * If we're not using SCB paging, we can use the tag as the direct 78415328Sgibbs * index to the SCB. 78513177Sgibbs */ 78615328Sgibbs mvi ARG_1,SCB_LIST_NULL /* Default to no-tag */ 78713177Sgibbssnoop_tag_loop: 78820117Sgibbs test SSTAT1,REQINIT jz snoop_tag_loop 78921947Sgibbs and LASTPHASE, PHASE_MASK, SCSISIGI 79021947Sgibbs cmp LASTPHASE, P_MESGIN, jne use_findSCB 79118762Sgibbs mvi A call inb_first 79218762Sgibbs cmp A,MSG_SIMPLE_Q_TAG jne use_findSCB 7936608Sgibbsget_tag: 79419218Sgibbs or FLAGS, TAGGED_SCB 79513177Sgibbs mvi ARG_1 call inb_next /* tag value */ 79613177Sgibbs/* 79713177Sgibbs * See if the tag is in range. The tag is < SCBCOUNT if we add 79813177Sgibbs * the complement of SCBCOUNT to the incomming tag and there is 79913177Sgibbs * no carry. 80013177Sgibbs */ 80113177Sgibbs mov A,COMP_SCBCOUNT 80213177Sgibbs add SINDEX,A,ARG_1 80319218Sgibbs jc send_abort_msg 80413177Sgibbs 80513177Sgibbs/* 80615328Sgibbs * Ensure that the SCB the tag points to is for an SCB transaction 80713177Sgibbs * to the reconnecting target. 80813177Sgibbs */ 80915328Sgibbs test FLAGS, PAGESCBS jz index_by_tag 81015328Sgibbsuse_findSCB: 81115328Sgibbs mov ALLZEROS call findSCB /* Have to search */ 81219218Sgibbs cmp SINDEX, SCB_LIST_NULL, je not_found 81315328Sgibbssetup_SCB: 81415328Sgibbs and SCB_CONTROL,0xfb /* clear disconnect bit in SCB */ 81515328Sgibbs or FLAGS,IDENTIFY_SEEN /* make note of IDENTIFY */ 81619164Sgibbs test SCB_CONTROL,TAG_ENB jnz mesgin_done /* Ack Tag */ 81715328Sgibbs jmp ITloop 81815328Sgibbsindex_by_tag: 81913177Sgibbs mov SCBPTR,ARG_1 82019218Sgibbs mov A, SAVED_TCL 82119218Sgibbs cmp SCB_TCL,A jne send_abort_msg 82219218Sgibbs test SCB_CONTROL,TAG_ENB jz send_abort_msg 82313177Sgibbs jmp setup_SCB 82415328Sgibbs 82519218Sgibbsnot_found: 82619218Sgibbs mvi INTSTAT, NO_MATCH 82719218Sgibbssend_abort_msg: 82819218Sgibbs test FLAGS, TAGGED_SCB jnz abort_tag_msg 82919218Sgibbs mvi MSG_ABORT call mk_mesg 83019218Sgibbs jmp mesgin_done 83119164Sgibbsabort_tag_msg: 83215328Sgibbs mvi MSG_ABORT_TAG call mk_mesg /* ABORT TAG message */ 83313177Sgibbs jmp mesgin_done 8346608Sgibbs 83513177Sgibbs/* 83613177Sgibbs * Message reject? Let the kernel driver handle this. If we have an 83713177Sgibbs * outstanding WDTR or SDTR negotiation, assume that it's a response from 83813177Sgibbs * the target selecting 8bit or asynchronous transfer, otherwise just ignore 83913177Sgibbs * it since we have no clue what it pertains to. 84013177Sgibbs */ 8419954Sgibbsmesgin_reject: 84213177Sgibbs mvi INTSTAT, REJECT_MSG 8439954Sgibbs jmp mesgin_done 8445562Sgibbs 84513177Sgibbs/* 84613177Sgibbs * [ ADD MORE MESSAGE HANDLING HERE ] 84713177Sgibbs */ 8484568Sgibbs 84913177Sgibbs/* 85013177Sgibbs * Locking the driver out, build a one-byte message passed in SINDEX 85113177Sgibbs * if there is no active message already. SINDEX is returned intact. 85213177Sgibbs */ 8534568Sgibbsmk_mesg: 85413177Sgibbs mvi SEQCTL,0x50 /* PAUSEDIS|FASTMODE */ 85513177Sgibbs test MSG_LEN,0xff jz mk_mesg1 /* Should always succeed */ 85613177Sgibbs 85713177Sgibbs /* 85813177Sgibbs * Hmmm. For some reason the mesg buffer is in use. 85913177Sgibbs * Tell the driver. It should look at SINDEX to find 86013177Sgibbs * out what we wanted to use the buffer for and resolve 86113177Sgibbs * the conflict. 86213177Sgibbs */ 86313177Sgibbs mvi SEQCTL,0x10 /* !PAUSEDIS|FASTMODE */ 86413690Sgibbs mvi INTSTAT,MSG_BUFFER_BUSY 8654568Sgibbs 8664568Sgibbsmk_mesg1: 86721947Sgibbs or SCSISIGO,ATNO,LASTPHASE /* turn on ATNO */ 86813177Sgibbs mvi MSG_LEN,1 /* length = 1 */ 86913177Sgibbs mov MSG0,SINDEX /* 1-byte message */ 87013177Sgibbs mvi SEQCTL,0x10 ret /* !PAUSEDIS|FASTMODE */ 8714568Sgibbs 87213177Sgibbs/* 87313177Sgibbs * Functions to read data in Automatic PIO mode. 87413177Sgibbs * 87513177Sgibbs * According to Adaptec's documentation, an ACK is not sent on input from 87613177Sgibbs * the target until SCSIDATL is read from. So we wait until SCSIDATL is 87713177Sgibbs * latched (the usual way), then read the data byte directly off the bus 87813177Sgibbs * using SCSIBUSL. When we have pulled the ATN line, or we just want to 87913177Sgibbs * acknowledge the byte, then we do a dummy read from SCISDATL. The SCSI 88013177Sgibbs * spec guarantees that the target will hold the data byte on the bus until 88113177Sgibbs * we send our ACK. 88213177Sgibbs * 88313177Sgibbs * The assumption here is that these are called in a particular sequence, 88413177Sgibbs * and that REQ is already set when inb_first is called. inb_{first,next} 88513177Sgibbs * use the same calling convention as inb. 88613177Sgibbs */ 88713177Sgibbs 88813177Sgibbsinb_next: 88921947Sgibbs mov NONE,SCSIDATL /*dummy read from latch to ACK*/ 89013360Sgibbsinb_next_wait: 89121947Sgibbs /* 89221947Sgibbs * If there is a parity error, wait for the kernel to 89321947Sgibbs * see the interrupt and prepare our message response 89421947Sgibbs * before continuing. 89521947Sgibbs */ 89621947Sgibbs test SSTAT1, REQINIT jz inb_next_wait 89721947Sgibbs test SSTAT1, SCSIPERR jnz inb_next_wait 89821947Sgibbs and LASTPHASE, PHASE_MASK, SCSISIGI 89921947Sgibbs cmp LASTPHASE, P_MESGIN jne mesgin_phasemis 90019623Sgibbsinb_first: 9014568Sgibbs mov DINDEX,SINDEX 90213177Sgibbs mov DINDIR,SCSIBUSL ret /*read byte directly from bus*/ 90313177Sgibbsinb_last: 90413360Sgibbs mov NONE,SCSIDATL ret /*dummy read from latch to ACK*/ 9054568Sgibbs 90613177Sgibbsmesgin_phasemis: 90713177Sgibbs/* 90813177Sgibbs * We expected to receive another byte, but the target changed phase 90913177Sgibbs */ 91013177Sgibbs mvi INTSTAT, MSGIN_PHASEMIS 91113177Sgibbs jmp ITloop 9124568Sgibbs 91313177Sgibbs/* 91413177Sgibbs * DMA data transfer. HADDR and HCNT must be loaded first, and 91513177Sgibbs * SINDEX should contain the value to load DFCNTRL with - 0x3d for 91613177Sgibbs * host->scsi, or 0x39 for scsi->host. The SCSI channel is cleared 91713177Sgibbs * during initialization. 91813177Sgibbs */ 9194568Sgibbsdma: 9204568Sgibbs mov DFCNTRL,SINDEX 9214568Sgibbsdma1: 92213177Sgibbs test SSTAT0,DMADONE jnz dma3 92313177Sgibbs test SSTAT1,PHASEMIS jz dma1 /* ie. underrun */ 9244568Sgibbs 92513177Sgibbs/* 92613177Sgibbs * We will be "done" DMAing when the transfer count goes to zero, or 92713177Sgibbs * the target changes the phase (in light of this, it makes sense that 92813177Sgibbs * the DMA circuitry doesn't ACK when PHASEMIS is active). If we are 92913177Sgibbs * doing a SCSI->Host transfer, the data FIFO should be flushed auto- 93013177Sgibbs * magically on STCNT=0 or a phase change, so just wait for FIFO empty 93113177Sgibbs * status. 93213177Sgibbs */ 9334568Sgibbsdma3: 93413177Sgibbs test SINDEX,DIRECTION jnz dma5 9354568Sgibbsdma4: 93613177Sgibbs test DFSTATUS,FIFOEMP jz dma4 9374568Sgibbs 93813177Sgibbs/* 93913177Sgibbs * Now shut the DMA enables off and make sure that the DMA enables are 94013177Sgibbs * actually off first lest we get an ILLSADDR. 94113177Sgibbs */ 9424568Sgibbsdma5: 94321982Sgibbs /* Don't clobber an inprogress host data transfer */ 94421982Sgibbs test DFSTATUS, MREQPEND jnz dma5 94521982Sgibbs /* disable DMA */ 94621982Sgibbs and DFCNTRL, 0xc7 /* ~(SCSIEN|SDMAEN|HDMAEN|DIRECTION) */ 9474568Sgibbsdma6: 94821982Sgibbs test DFCNTRL, HDMAENACK jnz dma6 94918762Sgibbsreturn: 9504568Sgibbs ret 9514568Sgibbs 95213177Sgibbs/* 95313177Sgibbs * Common SCSI initialization for selection and reselection. Expects 95413177Sgibbs * the target SCSI ID to be in the upper four bits of SINDEX, and A's 95513177Sgibbs * contents are stomped on return. 95613177Sgibbs */ 9578104Sgibbsinitialize_scsiid: 95813177Sgibbs and SINDEX,0xf0 /* Get target ID */ 95919164Sgibbs mov SAVED_TCL, SINDEX /* Update the target portion of this */ 9605775Sgibbs and A,0x0f,SCSIID 9615775Sgibbs or SINDEX,A 9628104Sgibbs mov SCSIID,SINDEX ret 9635326Sgibbs 96413177Sgibbs/* 96513177Sgibbs * Assert that if we've been reselected, then we've seen an IDENTIFY 96613177Sgibbs * message. 96713177Sgibbs */ 9684568Sgibbsassert: 96913177Sgibbs test FLAGS,RESELECTED jz return /* reselected? */ 97013177Sgibbs test FLAGS,IDENTIFY_SEEN jnz return /* seen IDENTIFY? */ 9714568Sgibbs 97219164Sgibbs mvi INTSTAT,NO_IDENT ret /* no - tell the kernel */ 9734568Sgibbs 97413177Sgibbs/* 97519218Sgibbs * Locate a disconnected SCB either by SAVED_TCL (ARG_1 is SCB_LIST_NULL) 97619218Sgibbs * or by the SCBIDn ARG_1. The search begins at the SCB index passed in 97719218Sgibbs * via SINDEX. If the SCB cannot be found, SINDEX will be SCB_LIST_NULL, 97819218Sgibbs * otherwise, SCBPTR is set to the proper SCB. 97913177Sgibbs */ 9804568SgibbsfindSCB: 98115328Sgibbs mov SCBPTR,SINDEX /* switch to next SCB */ 98213177Sgibbs test SCB_CONTROL,DISCONNECTED jz findSCB1 /*should be disconnected*/ 98319218Sgibbs cmp ARG_1, SCB_LIST_NULL jne findBySCBID 98419218Sgibbs mov A, SAVED_TCL 98519218Sgibbs cmp SCB_TCL,A je foundSCB /* target ID/channel/lun match? */ 98619164SgibbsfindSCB1: 98719164Sgibbs inc SINDEX 98819164Sgibbs mov A,SCBCOUNT 98919164Sgibbs cmp SINDEX,A jne findSCB 99019164Sgibbs/* 99119164Sgibbs * We didn't find it. If we're paging, pull an SCB and DMA down the 99219164Sgibbs * one we want. If we aren't paging or the SCB we dma down has the 99319218Sgibbs * abort flag set, return not found. 99419164Sgibbs */ 99519218Sgibbs test FLAGS, PAGESCBS jz find_error 99619623Sgibbs mov ALLZEROS call get_free_or_disc_scb 99719218Sgibbs cmp ARG_1, SCB_LIST_NULL jne find_dma_scb 99819218Sgibbs mov SAVED_TCL call index_untagged_scb 99919218Sgibbs mov ARG_1, SINDIR /* SCBID of SCB to fetch */ 100019164Sgibbsfind_dma_scb: 100119164Sgibbs mvi DMAPARAMS, 0xd /* HDMAEN|DIRECTION|FIFORESET */ 100219218Sgibbs mov ARG_1 call dma_scb 100319164Sgibbs test SCB_CONTROL, ABORT_SCB jz return 100419218Sgibbsfind_error: 100519218Sgibbs mvi SINDEX, SCB_LIST_NULL ret 100619218SgibbsfindBySCBID: 100715328Sgibbs mov A, ARG_1 /* Tag passed in ARG_1 */ 100815328Sgibbs cmp SCB_TAG,A jne findSCB1 /* Found it? */ 100915328SgibbsfoundSCB: 101019218Sgibbs test SCB_CONTROL, ABORT_SCB jnz find_error 101119164Sgibbs test FLAGS,PAGESCBS jz return 101219164Sgibbsrem_scb_from_disc_list: 101315328Sgibbs/* Remove this SCB from the disconnection list */ 101415328Sgibbs cmp SCB_NEXT,SCB_LIST_NULL je unlink_prev 101515328Sgibbs mov SAVED_LINKPTR, SCB_PREV 101615328Sgibbs mov SCBPTR, SCB_NEXT 101715328Sgibbs mov SCB_PREV, SAVED_LINKPTR 101815328Sgibbs mov SCBPTR, SINDEX 101915328Sgibbsunlink_prev: 102015328Sgibbs cmp SCB_PREV,SCB_LIST_NULL je rHead/* At the head of the list */ 102115328Sgibbs mov SAVED_LINKPTR, SCB_NEXT 102215328Sgibbs mov SCBPTR, SCB_PREV 102315328Sgibbs mov SCB_NEXT, SAVED_LINKPTR 102419164Sgibbs mov SCBPTR, SINDEX ret 102515328SgibbsrHead: 102619164Sgibbs mov DISCONNECTED_SCBH,SCB_NEXT ret 10274568Sgibbs 102819164Sgibbsset_stcnt_from_hcnt: 102919164Sgibbs mov STCNT0, HCNT0 103019164Sgibbs mov STCNT1, HCNT1 103119164Sgibbs mov STCNT2, HCNT2 ret 10324568Sgibbs 103319164Sgibbsbcopy_7: 103419164Sgibbs mov DINDIR, SINDIR 103519164Sgibbs mov DINDIR, SINDIR 103619164Sgibbsbcopy_5: 103719164Sgibbs mov DINDIR, SINDIR 103819164Sgibbsbcopy_4: 103919164Sgibbs mov DINDIR, SINDIR 104019164Sgibbsbcopy_3: 104119164Sgibbs mov DINDIR, SINDIR 104219164Sgibbs mov DINDIR, SINDIR 104319164Sgibbs mov DINDIR, SINDIR ret 10444568Sgibbs 104519164Sgibbsdma_scb: 104619164Sgibbs /* 104719164Sgibbs * SCB index is in SINDEX. Determine the physical address in 104819164Sgibbs * the host where this SCB is located and load HADDR with it. 104919164Sgibbs */ 105019164Sgibbs shr DINDEX, SINDEX, 3 105119164Sgibbs shl A, SINDEX, 5 105219164Sgibbs add HADDR0, A, HSCB_ADDR0 105319164Sgibbs mov A, DINDEX 105419164Sgibbs adc HADDR1, A, HSCB_ADDR1 105519164Sgibbs clr A 105619164Sgibbs adc HADDR2, A, HSCB_ADDR2 105719164Sgibbs adc HADDR3, A, HSCB_ADDR3 105819164Sgibbs /* Setup Count */ 105919164Sgibbs mvi HCNT0, 28 106019164Sgibbs clr HCNT1 106119164Sgibbs clr HCNT2 106219164Sgibbs mov DFCNTRL, DMAPARAMS 106319164Sgibbs test DMAPARAMS, DIRECTION jnz dma_scb_fromhost 106419164Sgibbs /* Fill it with the SCB data */ 106519164Sgibbs call copy_scb_tofifo 106619164Sgibbs mvi DFCNTRL, 0xa /* HDMAEN | FIFOFLUSH */ 106719164Sgibbsdma_scb_fromhost: 106819164Sgibbs call dma_finish 106919164Sgibbs /* If we were putting the SCB, we are done */ 107019164Sgibbs test DMAPARAMS, DIRECTION jz return 107119164Sgibbs mvi SCBARRAY call dfdat_in_7 107219164Sgibbs call dfdat_in_7_continued 107319164Sgibbs call dfdat_in_7_continued 107419164Sgibbs jmp dfdat_in_7_continued 107519164Sgibbsdfdat_in_7: 107619164Sgibbs mov DINDEX,SINDEX 107719164Sgibbsdfdat_in_7_continued: 107819164Sgibbs mov DINDIR,DFDAT 107919164Sgibbs mov DINDIR,DFDAT 108019164Sgibbs mov DINDIR,DFDAT 108119164Sgibbs mov DINDIR,DFDAT 108219164Sgibbs mov DINDIR,DFDAT 108319164Sgibbs mov DINDIR,DFDAT 108419164Sgibbs mov DINDIR,DFDAT ret 108519164Sgibbs 108619164Sgibbscopy_scb_tofifo: 108719164Sgibbs mvi SCBARRAY call dfdat_out_7 108819164Sgibbs call dfdat_out_7 108919164Sgibbs call dfdat_out_7 109019164Sgibbsdfdat_out_7: 109119164Sgibbs mov DFDAT,SINDIR 109219164Sgibbs mov DFDAT,SINDIR 109319164Sgibbs mov DFDAT,SINDIR 109419164Sgibbs mov DFDAT,SINDIR 109519164Sgibbs mov DFDAT,SINDIR 109619164Sgibbs mov DFDAT,SINDIR 109719164Sgibbs mov DFDAT,SINDIR ret 109819164Sgibbs 109913177Sgibbs/* 110019164Sgibbs * Wait for DMA from host memory to data FIFO to complete, then disable 110119164Sgibbs * DMA and wait for it to acknowledge that it's off. 110213177Sgibbs */ 110319164Sgibbsdma_finish: 110419164Sgibbs test DFSTATUS,HDONE jz dma_finish 110519164Sgibbs /* Turn off DMA preserving WIDEODD */ 110619164Sgibbs and DFCNTRL,WIDEODD 110719164Sgibbsdma_finish2: 110819164Sgibbs test DFCNTRL,HDMAENACK jnz dma_finish2 110919164Sgibbs ret 11109928Sgibbs 111119164Sgibbsindex_untagged_scb: 111219218Sgibbs mov DINDEX, SINDEX 111319218Sgibbs shr DINDEX, 4 111419218Sgibbs and DINDEX, 0x03 /* Bottom two bits of tid */ 111519218Sgibbs add DINDEX, SCB_ACTIVE0 111619218Sgibbs shr A, SINDEX, 6 /* Target ID divided by 4 */ 111719421Sgibbs test SINDEX, SELBUSB jz index_untagged_scb2 111819421Sgibbs add A, 2 /* Add 2 positions */ 111919164Sgibbsindex_untagged_scb2: 112019164Sgibbs mov SCBPTR, A /* 112119164Sgibbs * Select the SCB with this 112219164Sgibbs * target's information. 112319164Sgibbs */ 112419218Sgibbs mov SINDEX, DINDEX ret 11259928Sgibbs 11264568Sgibbs 112719164Sgibbsget_free_or_disc_scb: 112819623Sgibbs cmp FREE_SCBH, SCB_LIST_NULL jne dequeue_free_scb 112919623Sgibbs cmp DISCONNECTED_SCBH, SCB_LIST_NULL jne dequeue_disc_scb 113019623Sgibbsreturn_error: 113119623Sgibbs mvi SINDEX, SCB_LIST_NULL ret 113219623Sgibbsdequeue_disc_scb: 113319164Sgibbs mov SCBPTR, DISCONNECTED_SCBH 113413177Sgibbs/* 113519164Sgibbs * If we have a residual, then we are in the middle of some I/O 113619164Sgibbs * and we have to send this SCB back up to the kernel so that the 113719164Sgibbs * saved data pointers and residual information isn't lost. 113819164Sgibbs */ 113919164Sgibbs test SCB_RESID_SGCNT,0xff jz unlink_disc_scb 114019164Sgibbs mvi DMAPARAMS, 0x9 /* HDMAEN | FIFORESET*/ 114119164Sgibbs mov SCB_TAG call dma_scb 114219164Sgibbsunlink_disc_scb: 114319623Sgibbs /* jmp instead of call since we want to return anyway */ 114419623Sgibbs mov SCBPTR jmp rem_scb_from_disc_list 114519164Sgibbsdequeue_free_scb: 114619164Sgibbs mov SCBPTR, FREE_SCBH 114719164Sgibbs mov FREE_SCBH, SCB_NEXT ret 11484568Sgibbs 114919164Sgibbsadd_scb_to_free_list: 115019164Sgibbs mov SCB_NEXT, FREE_SCBH 115119164Sgibbs mov FREE_SCBH, SCBPTR ret 11524568Sgibbs 115319164Sgibbsadd_scb_to_disc_list: 115413177Sgibbs/* 115519164Sgibbs * Link this SCB into the DISCONNECTED list. This list holds the 115619164Sgibbs * candidates for paging out an SCB if one is needed for a new command. 115719164Sgibbs * Modifying the disconnected list is a critical(pause dissabled) section. 115813177Sgibbs */ 115919164Sgibbs mvi SCB_PREV, SCB_LIST_NULL 116019164Sgibbs mov SCB_NEXT, DISCONNECTED_SCBH 116119164Sgibbs mov DISCONNECTED_SCBH, SCBPTR 116219164Sgibbs cmp SCB_NEXT,SCB_LIST_NULL je return 116319164Sgibbs mov SCBPTR,SCB_NEXT 116419164Sgibbs mov SCB_PREV,DISCONNECTED_SCBH 116519164Sgibbs mov SCBPTR,DISCONNECTED_SCBH ret 11664568Sgibbs 1167