aic7xxx.seq revision 22451
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: 1022234Sgibbs *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 22451 1997-02-09 03:23:28Z 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: 8716198Sgibbs clr SCSIRATE /* 8816198Sgibbs * We don't know the target we will 8916198Sgibbs * connect to, so default to narrow 9016198Sgibbs * transfers to avoid parity problems. 9116198Sgibbs */ 9222451Sgibbs and SXFRCTL0, 0xdf /* ~FAST20*/ 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 15522078Sgibbs mvi SEQCTL,0x50 /* PAUSEDIS|FASTMODE */ 15619164Sgibbs mov SAVED_SCBPTR, SCBPTR 15719218Sgibbs mov SCB_TCL call index_untagged_scb 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: 19419164Sgibbs mov DINDIR, CUR_SCBID 19519164Sgibbs mov SCBPTR, SAVED_SCBPTR 19622078Sgibbs mvi SEQCTL,0x10 /* FASTMODE */ 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/* 29422451Sgibbs * Initialize Ultra mode setting and clear the SCSI channel. 29522451Sgibbs */ 29622451Sgibbs or SXFRCTL0, 0x1a /* CLRSTCNT|SPIOEN|CLRCHN */ 29722451Sgibbsultra: 29822451Sgibbs mvi SINDEX, ULTRA_ENB_B 29922451Sgibbs test SAVED_TCL, 0x80 jnz ultra_2 /* Target ID > 7 */ 30022451Sgibbs test SBLKCTL, SELBUSB jnz ultra_2 /* Second channel */ 30122451Sgibbs dec SINDEX 30222451Sgibbsultra_2: 30322451Sgibbs mov FUNCTION1,SAVED_TCL 30422451Sgibbs mov A,FUNCTION1 30522451Sgibbs test SINDIR, A jz ndx_dtr 30622451Sgibbs or SXFRCTL0, FAST20 30722451Sgibbs 30822451Sgibbs/* 30913177Sgibbs * Initialize SCSIRATE with the appropriate value for this target. 31019164Sgibbs * The SCSIRATE settings for each target are stored in an array 31119164Sgibbs * based at TARG_SCRATCH. 31213177Sgibbs */ 31319164Sgibbsndx_dtr: 31421947Sgibbs shr A,SAVED_TCL,4 31519164Sgibbs test SBLKCTL,SELBUSB jz ndx_dtr_2 31619164Sgibbs or SAVED_TCL, SELBUSB /* Add the channel bit while we're here */ 31719164Sgibbs or A,0x08 /* Channel B entries add 8 */ 31819164Sgibbsndx_dtr_2: 31919164Sgibbs add SINDEX,TARG_SCRATCH,A 32013177Sgibbs mov SCSIRATE,SINDIR 32113177Sgibbs 32215843Sgibbs 32313177Sgibbs/* 32413177Sgibbs * Main loop for information transfer phases. If BSY is false, then 32513177Sgibbs * we have a bus free condition, expected or not. Otherwise, wait 32613177Sgibbs * for the target to assert REQ before checking MSG, C/D and I/O 32713177Sgibbs * for the bus phase. 32813177Sgibbs * 32913177Sgibbs */ 3304568SgibbsITloop: 33122451Sgibbs test SSTAT1,0x9 jz ITloop /* REQINIT|BUSFREE */ 33213177Sgibbs test SSTAT1,BUSFREE jnz p_busfree 3334568Sgibbs 33413177Sgibbs and A,PHASE_MASK,SCSISIGI 33513690Sgibbs mov LASTPHASE,A 33613690Sgibbs mov SCSISIGO,A 3374568Sgibbs 3384568Sgibbs cmp ALLZEROS,A je p_dataout 33913177Sgibbs cmp A,P_DATAIN je p_datain 34013177Sgibbs cmp A,P_COMMAND je p_command 34113177Sgibbs cmp A,P_MESGOUT je p_mesgout 34213177Sgibbs cmp A,P_STATUS je p_status 34313177Sgibbs cmp A,P_MESGIN je p_mesgin 3444568Sgibbs 34513177Sgibbs mvi INTSTAT,BAD_PHASE /* unknown phase - signal driver */ 34615843Sgibbs jmp ITloop /* Try reading the bus again. */ 3474568Sgibbs 3484568Sgibbsp_dataout: 34913177Sgibbs mvi DMAPARAMS,0x7d /* 35013177Sgibbs * WIDEODD|SCSIEN|SDMAEN|HDMAEN| 35113177Sgibbs * DIRECTION|FIFORESET 35213177Sgibbs */ 3539928Sgibbs jmp data_phase_init 3544568Sgibbs 35513177Sgibbs/* 35613177Sgibbs * If we re-enter the data phase after going through another phase, the 35713177Sgibbs * STCNT may have been cleared, so restore it from the residual field. 35813177Sgibbs */ 3599928Sgibbsdata_phase_reinit: 36019231Sgibbs mvi DINDEX, STCNT0 36119231Sgibbs mvi SCB_RESID_DCNT0 call bcopy_3 3629928Sgibbs jmp data_phase_loop 3634568Sgibbs 3649928Sgibbsp_datain: 36513177Sgibbs mvi DMAPARAMS,0x79 /* 36613177Sgibbs * WIDEODD|SCSIEN|SDMAEN|HDMAEN| 36713177Sgibbs * !DIRECTION|FIFORESET 36813177Sgibbs */ 3699928Sgibbsdata_phase_init: 37019164Sgibbs call assert /* 37119164Sgibbs * Ensure entering a data 37219164Sgibbs * phase is okay - seen identify, etc. 37319164Sgibbs */ 3745775Sgibbs 3759928Sgibbs test FLAGS, DPHASE jnz data_phase_reinit 3764568Sgibbs 37719164Sgibbs /* 37819164Sgibbs * Initialize the DMA address and counter from the SCB. 37919164Sgibbs * Also set SG_COUNT and SG_NEXT in memory since we cannot 38019164Sgibbs * modify the values in the SCB itself until we see a 38119164Sgibbs * save data pointers message. 38219164Sgibbs */ 38319164Sgibbs mvi DINDEX, HADDR0 38419164Sgibbs mvi SCB_DATAPTR call bcopy_7 38519164Sgibbs 38619164Sgibbs call set_stcnt_from_hcnt 38719164Sgibbs 38819164Sgibbs mov SG_COUNT,SCB_SGCOUNT 38919164Sgibbs 39019164Sgibbs mvi DINDEX, SG_NEXT 39119164Sgibbs mvi SCB_SGPTR call bcopy_4 39219164Sgibbs 39319164Sgibbs /* We have seen a data phase */ 39419164Sgibbs or FLAGS, DPHASE 39519164Sgibbs 3969928Sgibbsdata_phase_loop: 39716260Sgibbs/* Guard against overruns */ 39816260Sgibbs test SG_COUNT, 0xff jnz data_phase_inbounds 39916260Sgibbs/* 40016260Sgibbs * Turn on 'Bit Bucket' mode, set the transfer count to 40116260Sgibbs * 16meg and let the target run until it changes phase. 40216260Sgibbs * When the transfer completes, notify the host that we 40316260Sgibbs * had an overrun. 40416260Sgibbs */ 40516260Sgibbs or SXFRCTL1,BITBUCKET 40622451Sgibbs mvi HCNT0, 0xff 40722451Sgibbs mvi HCNT1, 0xff 40822451Sgibbs mvi HCNT2, 0xff 40922451Sgibbs call set_stcnt_from_hcnt 41016260Sgibbs 41116260Sgibbsdata_phase_inbounds: 41219164Sgibbs/* If we are the last SG block, ensure wideodd is off. */ 4139928Sgibbs cmp SG_COUNT,0x01 jne data_phase_wideodd 41413177Sgibbs and DMAPARAMS, 0xbf /* Turn off WIDEODD */ 4159928Sgibbsdata_phase_wideodd: 4169928Sgibbs mov DMAPARAMS call dma 4174568Sgibbs 41816260Sgibbs/* Go tell the host about any overruns */ 41916260Sgibbs test SXFRCTL1,BITBUCKET jnz data_phase_overrun 42016260Sgibbs 42122451Sgibbs/* Exit if we had an underrun. dma clears SINDEX in this case. */ 42222451Sgibbs test SINDEX,0xff jz data_phase_finish 4237532Sgibbs 42413177Sgibbs/* 42513177Sgibbs * Advance the scatter-gather pointers if needed 42613177Sgibbs */ 4279928Sgibbssg_advance: 42813177Sgibbs dec SG_COUNT /* one less segment to go */ 4294568Sgibbs 43013177Sgibbs test SG_COUNT, 0xff jz data_phase_finish /* Are we done? */ 4314568Sgibbs 43213177Sgibbs clr A /* add sizeof(struct scatter) */ 43313177Sgibbs add SG_NEXT0,SG_SIZEOF,SG_NEXT0 43413177Sgibbs adc SG_NEXT1,A,SG_NEXT1 4354568Sgibbs 43613177Sgibbs/* 43713177Sgibbs * Load a struct scatter and set up the data address and length. 43813177Sgibbs * If the working value of the SG count is nonzero, then 43913177Sgibbs * we need to load a new set of values. 44013177Sgibbs * 44115328Sgibbs * This, like all DMA's, assumes little-endian host data storage. 44213177Sgibbs */ 4439928Sgibbssg_load: 44413177Sgibbs clr HCNT2 44513177Sgibbs clr HCNT1 44613177Sgibbs mvi HCNT0,SG_SIZEOF 4474568Sgibbs 44819164Sgibbs mvi DINDEX, HADDR0 44919164Sgibbs mvi SG_NEXT0 call bcopy_4 4504568Sgibbs 45113690Sgibbs or DFCNTRL,0xd /* HDMAEN|DIRECTION|FIFORESET */ 4529928Sgibbs 45319164Sgibbs call dma_finish 4549928Sgibbs 45513177Sgibbs/* 45613177Sgibbs * Copy data from FIFO into SCB data pointer and data count. This assumes 45719164Sgibbs * that the SG segments are of the form: 45813177Sgibbs * 45913177Sgibbs * struct ahc_dma_seg { 46019164Sgibbs * u_int32_t addr; four bytes, little-endian order 46119164Sgibbs * u_int32_t len; four bytes, little endian order 46213177Sgibbs * }; 46313177Sgibbs */ 46419164Sgibbs mvi HADDR0 call dfdat_in_7 4659928Sgibbs 46613177Sgibbs/* Load STCNT as well. It is a mirror of HCNT */ 46719164Sgibbs call set_stcnt_from_hcnt 46819164Sgibbs test SSTAT1,PHASEMIS jz data_phase_loop 4694568Sgibbs 4709928Sgibbsdata_phase_finish: 47113177Sgibbs/* 47213177Sgibbs * After a DMA finishes, save the SG and STCNT residuals back into the SCB 47313177Sgibbs * We use STCNT instead of HCNT, since it's a reflection of how many bytes 47413177Sgibbs * were transferred on the SCSI (as opposed to the host) bus. 47513177Sgibbs */ 47613690Sgibbs mov SCB_RESID_DCNT0,STCNT0 47713690Sgibbs mov SCB_RESID_DCNT1,STCNT1 47813690Sgibbs mov SCB_RESID_DCNT2,STCNT2 47913177Sgibbs mov SCB_RESID_SGCNT, SG_COUNT 4804568Sgibbs jmp ITloop 4814568Sgibbs 48216260Sgibbsdata_phase_overrun: 48313177Sgibbs/* 48416260Sgibbs * Turn off BITBUCKET mode and notify the host 48516260Sgibbs */ 48616260Sgibbs and SXFRCTL1,0x7f /* ~BITBUCKET */ 48716260Sgibbs mvi INTSTAT,DATA_OVERRUN 48816260Sgibbs jmp ITloop 48916260Sgibbs 49016260Sgibbs/* 49115328Sgibbs * Command phase. Set up the DMA registers and let 'er rip. 49213177Sgibbs */ 4934568Sgibbsp_command: 4944568Sgibbs call assert 4954568Sgibbs 49613177Sgibbs/* 49715328Sgibbs * Load HADDR and HCNT. 49813177Sgibbs */ 49919164Sgibbs mvi DINDEX, HADDR0 50019164Sgibbs mvi SCB_CMDPTR call bcopy_5 50113690Sgibbs clr HCNT1 50213690Sgibbs clr HCNT2 5034568Sgibbs 50419164Sgibbs call set_stcnt_from_hcnt 5054568Sgibbs 50622078Sgibbs mvi 0x3d call dma /* SCSIEN|SDMAEN|HDMAEN 50721982Sgibbs * |DIRECTION|FIFORESET 50821982Sgibbs */ 5094568Sgibbs jmp ITloop 5104568Sgibbs 51113177Sgibbs/* 51213177Sgibbs * Status phase. Wait for the data byte to appear, then read it 51313177Sgibbs * and store it into the SCB. 51413177Sgibbs */ 5154568Sgibbsp_status: 51619803Sgibbs call assert 51719803Sgibbs 51821947Sgibbs mov SCB_TARGET_STATUS, SCSIDATL 51921947Sgibbs jmp ITloop 5204568Sgibbs 52113177Sgibbs/* 52215328Sgibbs * Message out phase. If there is not an active message, but the target 52313177Sgibbs * took us into this phase anyway, build a no-op message and send it. 52413177Sgibbs */ 5254568Sgibbsp_mesgout: 52613177Sgibbs test MSG_LEN, 0xff jnz p_mesgout_start 52718762Sgibbs mvi MSG_NOOP call mk_mesg /* build NOP message */ 52813177Sgibbsp_mesgout_start: 52913177Sgibbs/* 53013177Sgibbs * Set up automatic PIO transfer from MSG0. Bit 3 in 53113177Sgibbs * SXFRCTL0 (SPIOEN) is already on. 53213177Sgibbs */ 53313177Sgibbs mvi SINDEX,MSG0 5344568Sgibbs mov DINDEX,MSG_LEN 5354568Sgibbs 53613177Sgibbs/* 53713177Sgibbs * When target asks for a byte, drop ATN if it's the last one in 53813177Sgibbs * the message. Otherwise, keep going until the message is exhausted. 53913177Sgibbs * 54013177Sgibbs * Keep an eye out for a phase change, in case the target issues 54113177Sgibbs * a MESSAGE REJECT. 54213177Sgibbs */ 54313177Sgibbsp_mesgout_loop: 54421947Sgibbs /* 54521947Sgibbs * If there is a parity error, wait for the kernel to 54621947Sgibbs * see the interrupt and "update" our message response 54721947Sgibbs * before continuing. 54821947Sgibbs */ 54921947Sgibbs test SSTAT1, REQINIT jz p_mesgout_loop 55021947Sgibbs test SSTAT1, SCSIPERR jnz p_mesgout_loop 55121947Sgibbs and LASTPHASE, PHASE_MASK, SCSISIGI 55221947Sgibbs cmp LASTPHASE, P_MESGOUT jne p_mesgout_done 55313177Sgibbs/* 55413177Sgibbs * If the next bus phase after ATN drops is a message out, it means 55513177Sgibbs * that the target is requesting that the last message(s) be resent. 55613177Sgibbs */ 55719921Sgibbsp_mesgout_testretry: 55820117Sgibbs test DINDEX,0xff jnz p_mesgout_dropatn 55921947Sgibbs or SCSISIGO,ATNO,LASTPHASE /* turn on ATN for the retry */ 56019906Sgibbs jmp p_mesgout_start 56120117Sgibbsp_mesgout_dropatn: 56220117Sgibbs cmp DINDEX,1 jne p_mesgout_outb /* last byte? */ 56320117Sgibbs mvi CLRSINT1,CLRATNO /* drop ATN */ 56419906Sgibbsp_mesgout_outb: 56519906Sgibbs dec DINDEX 56619906Sgibbs mvi CLRSINT0, CLRSPIORDY 56719906Sgibbs mov SCSIDATL,SINDIR 56819906Sgibbs jmp p_mesgout_loop 5694568Sgibbs 57019906Sgibbsp_mesgout_done: 57115328Sgibbs mvi CLRSINT1,CLRATNO /* Be sure to turn ATNO off */ 57213177Sgibbs clr MSG_LEN /* no active msg */ 5734568Sgibbs jmp ITloop 5744568Sgibbs 57513177Sgibbs/* 57613177Sgibbs * Message in phase. Bytes are read using Automatic PIO mode. 57713177Sgibbs */ 5784568Sgibbsp_mesgin: 57913177Sgibbs mvi A call inb_first /* read the 1st message byte */ 58013177Sgibbs mov REJBYTE,A /* save it for the driver */ 5814568Sgibbs 58218762Sgibbs test A,MSG_IDENTIFYFLAG jnz mesgin_identify 58313177Sgibbs cmp A,MSG_DISCONNECT je mesgin_disconnect 58418762Sgibbs cmp A,MSG_SAVEDATAPOINTER je mesgin_sdptrs 58513177Sgibbs cmp ALLZEROS,A je mesgin_complete 58618762Sgibbs cmp A,MSG_RESTOREPOINTERS je mesgin_rdptrs 58713177Sgibbs cmp A,MSG_EXTENDED je mesgin_extended 58818762Sgibbs cmp A,MSG_MESSAGE_REJECT je mesgin_reject 58922451Sgibbs cmp A,MSG_NOOP je mesgin_done 5904568Sgibbs 5919954Sgibbsrej_mesgin: 59213177Sgibbs/* 59319164Sgibbs * We have no idea what this message in is, so we issue a message reject 59419164Sgibbs * and hope for the best. In any case, rejection should be a rare 59519164Sgibbs * occurrence - signal the driver when it happens. 59613177Sgibbs */ 59713177Sgibbs mvi INTSTAT,SEND_REJECT /* let driver know */ 5989954Sgibbs 59918762Sgibbs mvi MSG_MESSAGE_REJECT call mk_mesg 6009954Sgibbs 6019954Sgibbsmesgin_done: 60222451Sgibbs call inb_last 6039954Sgibbs jmp ITloop 6049954Sgibbs 6059954Sgibbs 6069954Sgibbsmesgin_complete: 60713177Sgibbs/* 60819164Sgibbs * We got a "command complete" message, so put the SCB_TAG into the QOUTFIFO, 60919164Sgibbs * and trigger a completion interrupt. Before doing so, check to see if there 61019164Sgibbs * is a residual or the status byte is something other than NO_ERROR (0). In 61119164Sgibbs * either of these conditions, we upload the SCB back to the host so it can 61219164Sgibbs * process this information. In the case of a non zero status byte, we 61319164Sgibbs * additionally interrupt the kernel driver synchronously, allowing it to 61419164Sgibbs * decide if sense should be retrieved. If the kernel driver wishes to request 61519164Sgibbs * sense, it will fill the kernel SCB with a request sense command and set 61619164Sgibbs * RETURN_1 to SEND_SENSE. If RETURN_1 is set to SEND_SENSE we redownload 61719164Sgibbs * the SCB, and process it as the next command by adding it to the waiting list. 61819164Sgibbs * If the kernel driver does not wish to request sense, it need only clear 61919164Sgibbs * RETURN_1, and the command is allowed to complete normally. We don't bother 62019164Sgibbs * to post to the QOUTFIFO in the error cases since it would require extra 62119164Sgibbs * work in the kernel driver to ensure that the entry was removed before the 62219164Sgibbs * command complete code tried processing it. 62313177Sgibbs */ 62419164Sgibbs 62513177Sgibbs/* 62619921Sgibbs * We expect to go to bus free after this message. 62719921Sgibbs */ 62819921Sgibbs and SIMODE1, 0xf7 /* ~ENBUSFREE */ 62919921Sgibbs/* 63019164Sgibbs * First check for residuals 63113177Sgibbs */ 63219164Sgibbs test SCB_RESID_SGCNT,0xff jnz upload_scb 63319164Sgibbs test SCB_TARGET_STATUS,0xff jz status_ok /* Good Status? */ 63419164Sgibbsupload_scb: 63519164Sgibbs mvi DMAPARAMS, 0x9 /* HDMAEN | FIFORESET*/ 63619164Sgibbs mov SCB_TAG call dma_scb 6377532Sgibbscheck_status: 63819164Sgibbs test SCB_TARGET_STATUS,0xff jz status_ok /* Just a residual? */ 63913177Sgibbs mvi INTSTAT,BAD_STATUS /* let driver know */ 64013177Sgibbs cmp RETURN_1, SEND_SENSE jne status_ok 64119164Sgibbs /* This SCB becomes the next to execute as it will retrieve sense */ 64219164Sgibbs mov SCB_LINKED_NEXT, SCB_TAG 64319164Sgibbs jmp dma_next_scb 6445326Sgibbs 6454568Sgibbsstatus_ok: 64613177Sgibbs/* First, mark this target as free. */ 64719921Sgibbs test SCB_CONTROL,TAG_ENB jnz complete /* 64813177Sgibbs * Tagged commands 64913177Sgibbs * don't busy the 65013177Sgibbs * target. 65113177Sgibbs */ 65219164Sgibbs mov SAVED_SCBPTR, SCBPTR 65319164Sgibbs mov SAVED_LINKPTR, SCB_LINKED_NEXT 65419218Sgibbs mov SCB_TCL call index_untagged_scb 65519164Sgibbs mov DINDIR, SAVED_LINKPTR 65619164Sgibbs mov SCBPTR, SAVED_SCBPTR 6575326Sgibbs 6585326Sgibbscomplete: 65919164Sgibbs /* Post the SCB and issue an interrupt */ 66015328Sgibbs mov QOUTFIFO,SCB_TAG 6617532Sgibbs mvi INTSTAT,CMDCMPLT 66219164Sgibbs 66319164Sgibbsdma_next_scb: 66419921Sgibbs cmp SCB_LINKED_NEXT, SCB_LIST_NULL je add_to_free_list 66519164Sgibbs test FLAGS, PAGESCBS jnz dma_next_scb2 66619164Sgibbs /* Only DMA on top of ourselves if we are the SCB to download */ 66719164Sgibbs mov A, SCB_LINKED_NEXT 66819164Sgibbs cmp SCB_TAG, A je dma_next_scb2 66919164Sgibbs mov SCBPTR, A 67019164Sgibbs jmp add_to_waiting_list 67119164Sgibbsdma_next_scb2: 67219164Sgibbs mvi DMAPARAMS, 0xd /* HDMAEN|DIRECTION|FIFORESET */ 67319218Sgibbs mov SCB_LINKED_NEXT call dma_scb 67419164Sgibbsadd_to_waiting_list: 67519164Sgibbs mov SCB_NEXT,WAITING_SCBH 67619164Sgibbs mov WAITING_SCBH, SCBPTR 6779954Sgibbs jmp mesgin_done 67819921Sgibbsadd_to_free_list: 67919921Sgibbs call add_scb_to_free_list 68019921Sgibbs jmp mesgin_done 6814568Sgibbs 68213177Sgibbs/* 68318762Sgibbs * Is it an extended message? Copy the message to our message buffer and 68418762Sgibbs * notify the host. The host will tell us whether to reject this message, 68518762Sgibbs * respond to it with the message that the host placed in our message buffer, 68618762Sgibbs * or simply to do nothing. 68713177Sgibbs */ 6889954Sgibbsmesgin_extended: 68918762Sgibbs mvi MSGIN_EXT_LEN call inb_next 69018762Sgibbs mov A, MSGIN_EXT_LEN 69118762Sgibbsmesgin_extended_loop: 69219164Sgibbs mov DINDEX call inb_next 69318762Sgibbs dec A 69419164Sgibbs cmp DINDEX, MSGIN_EXT_LASTBYTE jne mesgin_extended_loop_test 69519164Sgibbs dec DINDEX /* dump by repeatedly filling the last byte */ 69619164Sgibbsmesgin_extended_loop_test: 69719164Sgibbs test A, 0xFF jnz mesgin_extended_loop 69818762Sgibbsmesgin_extended_intr: 69918762Sgibbs mvi INTSTAT,EXTENDED_MSG /* let driver know */ 70018762Sgibbs cmp RETURN_1,SEND_REJ je rej_mesgin 70118762Sgibbs cmp RETURN_1,SEND_MSG jne mesgin_done 70218762Sgibbs/* The kernel has setup a message to be sent */ 70321947Sgibbs or SCSISIGO,ATNO,LASTPHASE /* turn on ATNO */ 7049954Sgibbs jmp mesgin_done 7055562Sgibbs 70613177Sgibbs/* 70713177Sgibbs * Is it a disconnect message? Set a flag in the SCB to remind us 70813177Sgibbs * and await the bus going free. 70913177Sgibbs */ 7109954Sgibbsmesgin_disconnect: 71119921Sgibbs and SIMODE1, 0xf7 /* ~ENBUSFREE */ 71213177Sgibbs or SCB_CONTROL,DISCONNECTED 71315328Sgibbs test FLAGS, PAGESCBS jz mesgin_done 71419164Sgibbs call add_scb_to_disc_list 71519164Sgibbs jmp mesgin_done 71619164Sgibbs 71715328Sgibbs/* 71819164Sgibbs * Save data pointers message: 71919164Sgibbs * Copying RAM values back to SCB, for Save Data Pointers message, but 72019164Sgibbs * only if we've actually been into a data phase to change them. This 72119164Sgibbs * protects against bogus data in scratch ram and the residual counts 72219164Sgibbs * since they are only initialized when we go into data_in or data_out. 72315328Sgibbs */ 72419164Sgibbsmesgin_sdptrs: 72519164Sgibbs test FLAGS, DPHASE jz mesgin_done 72619164Sgibbs mov SCB_SGCOUNT,SG_COUNT 7274568Sgibbs 72819164Sgibbs /* The SCB SGPTR becomes the next one we'll download */ 72919164Sgibbs mvi DINDEX, SCB_SGPTR 73019164Sgibbs mvi SG_NEXT0 call bcopy_4 73119164Sgibbs 73219164Sgibbs /* The SCB DATAPTR0 becomes the current SHADDR */ 73319164Sgibbs mvi DINDEX, SCB_DATAPTR0 73419164Sgibbs mvi SHADDR0 call bcopy_4 73519164Sgibbs 73613177Sgibbs/* 73719164Sgibbs * Use the residual number since STCNT is corrupted by any message transfer. 73813177Sgibbs */ 73919164Sgibbs mvi SCB_RESID_DCNT0 call bcopy_3 74019164Sgibbs 7419954Sgibbs jmp mesgin_done 7424568Sgibbs 74313177Sgibbs/* 74413177Sgibbs * Restore pointers message? Data pointers are recopied from the 74513177Sgibbs * SCB anytime we enter a data phase for the first time, so all 74613177Sgibbs * we need to do is clear the DPHASE flag and let the data phase 74713177Sgibbs * code do the rest. 74813177Sgibbs */ 7499954Sgibbsmesgin_rdptrs: 75015328Sgibbs and FLAGS,0xef /* 75113177Sgibbs * !DPHASE we'll reload them 75213177Sgibbs * the next time through 75313177Sgibbs */ 7549954Sgibbs jmp mesgin_done 7554568Sgibbs 75613177Sgibbs/* 75713177Sgibbs * Identify message? For a reconnecting target, this tells us the lun 75813177Sgibbs * that the reconnection is for - find the correct SCB and switch to it, 75913177Sgibbs * clearing the "disconnected" bit so we don't "find" it by accident later. 76013177Sgibbs */ 7619954Sgibbsmesgin_identify: 76213177Sgibbs test A,0x78 jnz rej_mesgin /*!DiscPriv|!LUNTAR|!Reserved*/ 76313177Sgibbs and A,0x07 /* lun in lower three bits */ 76419164Sgibbs or SAVED_TCL,A /* SAVED_TCL should be complete now */ 76513177Sgibbs call inb_last /* ACK */ 76613177Sgibbs 76713177Sgibbs/* 76813177Sgibbs * Here we "snoop" the bus looking for a SIMPLE QUEUE TAG message. 76915328Sgibbs * If we get one, we use the tag returned to switch to find the proper 77015328Sgibbs * SCB. With SCB paging, this requires using findSCB for both tagged 77115328Sgibbs * and non-tagged transactions since the SCB may exist in any slot. 77215328Sgibbs * If we're not using SCB paging, we can use the tag as the direct 77315328Sgibbs * index to the SCB. 77413177Sgibbs */ 77515328Sgibbs mvi ARG_1,SCB_LIST_NULL /* Default to no-tag */ 77613177Sgibbssnoop_tag_loop: 77720117Sgibbs test SSTAT1,REQINIT jz snoop_tag_loop 77821947Sgibbs and LASTPHASE, PHASE_MASK, SCSISIGI 77921947Sgibbs cmp LASTPHASE, P_MESGIN, jne use_findSCB 78018762Sgibbs mvi A call inb_first 78118762Sgibbs cmp A,MSG_SIMPLE_Q_TAG jne use_findSCB 7826608Sgibbsget_tag: 78319218Sgibbs or FLAGS, TAGGED_SCB 78413177Sgibbs mvi ARG_1 call inb_next /* tag value */ 78513177Sgibbs/* 78613177Sgibbs * See if the tag is in range. The tag is < SCBCOUNT if we add 78713177Sgibbs * the complement of SCBCOUNT to the incomming tag and there is 78813177Sgibbs * no carry. 78913177Sgibbs */ 79013177Sgibbs mov A,COMP_SCBCOUNT 79113177Sgibbs add SINDEX,A,ARG_1 79219218Sgibbs jc send_abort_msg 79313177Sgibbs 79413177Sgibbs/* 79515328Sgibbs * Ensure that the SCB the tag points to is for an SCB transaction 79613177Sgibbs * to the reconnecting target. 79713177Sgibbs */ 79815328Sgibbs test FLAGS, PAGESCBS jz index_by_tag 79915328Sgibbsuse_findSCB: 80015328Sgibbs mov ALLZEROS call findSCB /* Have to search */ 80119218Sgibbs cmp SINDEX, SCB_LIST_NULL, je not_found 80215328Sgibbssetup_SCB: 80315328Sgibbs and SCB_CONTROL,0xfb /* clear disconnect bit in SCB */ 80415328Sgibbs or FLAGS,IDENTIFY_SEEN /* make note of IDENTIFY */ 80519164Sgibbs test SCB_CONTROL,TAG_ENB jnz mesgin_done /* Ack Tag */ 80615328Sgibbs jmp ITloop 80715328Sgibbsindex_by_tag: 80813177Sgibbs mov SCBPTR,ARG_1 80919218Sgibbs mov A, SAVED_TCL 81019218Sgibbs cmp SCB_TCL,A jne send_abort_msg 81119218Sgibbs test SCB_CONTROL,TAG_ENB jz send_abort_msg 81213177Sgibbs jmp setup_SCB 81315328Sgibbs 81419218Sgibbsnot_found: 81519218Sgibbs mvi INTSTAT, NO_MATCH 81619218Sgibbssend_abort_msg: 81719218Sgibbs test FLAGS, TAGGED_SCB jnz abort_tag_msg 81819218Sgibbs mvi MSG_ABORT call mk_mesg 81919218Sgibbs jmp mesgin_done 82019164Sgibbsabort_tag_msg: 82115328Sgibbs mvi MSG_ABORT_TAG call mk_mesg /* ABORT TAG message */ 82213177Sgibbs jmp mesgin_done 8236608Sgibbs 82413177Sgibbs/* 82513177Sgibbs * Message reject? Let the kernel driver handle this. If we have an 82613177Sgibbs * outstanding WDTR or SDTR negotiation, assume that it's a response from 82713177Sgibbs * the target selecting 8bit or asynchronous transfer, otherwise just ignore 82813177Sgibbs * it since we have no clue what it pertains to. 82913177Sgibbs */ 8309954Sgibbsmesgin_reject: 83113177Sgibbs mvi INTSTAT, REJECT_MSG 8329954Sgibbs jmp mesgin_done 8335562Sgibbs 83413177Sgibbs/* 83513177Sgibbs * [ ADD MORE MESSAGE HANDLING HERE ] 83613177Sgibbs */ 8374568Sgibbs 83813177Sgibbs/* 83913177Sgibbs * Locking the driver out, build a one-byte message passed in SINDEX 84013177Sgibbs * if there is no active message already. SINDEX is returned intact. 84113177Sgibbs */ 8424568Sgibbsmk_mesg: 84313177Sgibbs mvi SEQCTL,0x50 /* PAUSEDIS|FASTMODE */ 84413177Sgibbs test MSG_LEN,0xff jz mk_mesg1 /* Should always succeed */ 84513177Sgibbs 84613177Sgibbs /* 84713177Sgibbs * Hmmm. For some reason the mesg buffer is in use. 84813177Sgibbs * Tell the driver. It should look at SINDEX to find 84913177Sgibbs * out what we wanted to use the buffer for and resolve 85013177Sgibbs * the conflict. 85113177Sgibbs */ 85213177Sgibbs mvi SEQCTL,0x10 /* !PAUSEDIS|FASTMODE */ 85313690Sgibbs mvi INTSTAT,MSG_BUFFER_BUSY 8544568Sgibbs 8554568Sgibbsmk_mesg1: 85621947Sgibbs or SCSISIGO,ATNO,LASTPHASE /* turn on ATNO */ 85713177Sgibbs mvi MSG_LEN,1 /* length = 1 */ 85813177Sgibbs mov MSG0,SINDEX /* 1-byte message */ 85913177Sgibbs mvi SEQCTL,0x10 ret /* !PAUSEDIS|FASTMODE */ 8604568Sgibbs 86113177Sgibbs/* 86213177Sgibbs * Functions to read data in Automatic PIO mode. 86313177Sgibbs * 86413177Sgibbs * According to Adaptec's documentation, an ACK is not sent on input from 86513177Sgibbs * the target until SCSIDATL is read from. So we wait until SCSIDATL is 86613177Sgibbs * latched (the usual way), then read the data byte directly off the bus 86713177Sgibbs * using SCSIBUSL. When we have pulled the ATN line, or we just want to 86813177Sgibbs * acknowledge the byte, then we do a dummy read from SCISDATL. The SCSI 86913177Sgibbs * spec guarantees that the target will hold the data byte on the bus until 87013177Sgibbs * we send our ACK. 87113177Sgibbs * 87213177Sgibbs * The assumption here is that these are called in a particular sequence, 87313177Sgibbs * and that REQ is already set when inb_first is called. inb_{first,next} 87413177Sgibbs * use the same calling convention as inb. 87513177Sgibbs */ 87613177Sgibbs 87713177Sgibbsinb_next: 87821947Sgibbs mov NONE,SCSIDATL /*dummy read from latch to ACK*/ 87913360Sgibbsinb_next_wait: 88021947Sgibbs /* 88121947Sgibbs * If there is a parity error, wait for the kernel to 88221947Sgibbs * see the interrupt and prepare our message response 88321947Sgibbs * before continuing. 88421947Sgibbs */ 88521947Sgibbs test SSTAT1, REQINIT jz inb_next_wait 88621947Sgibbs test SSTAT1, SCSIPERR jnz inb_next_wait 88721947Sgibbs and LASTPHASE, PHASE_MASK, SCSISIGI 88821947Sgibbs cmp LASTPHASE, P_MESGIN jne mesgin_phasemis 88919623Sgibbsinb_first: 8904568Sgibbs mov DINDEX,SINDEX 89113177Sgibbs mov DINDIR,SCSIBUSL ret /*read byte directly from bus*/ 89213177Sgibbsinb_last: 89313360Sgibbs mov NONE,SCSIDATL ret /*dummy read from latch to ACK*/ 8944568Sgibbs 89513177Sgibbsmesgin_phasemis: 89613177Sgibbs/* 89713177Sgibbs * We expected to receive another byte, but the target changed phase 89813177Sgibbs */ 89913177Sgibbs mvi INTSTAT, MSGIN_PHASEMIS 90013177Sgibbs jmp ITloop 9014568Sgibbs 90213177Sgibbs/* 90313177Sgibbs * DMA data transfer. HADDR and HCNT must be loaded first, and 90413177Sgibbs * SINDEX should contain the value to load DFCNTRL with - 0x3d for 90513177Sgibbs * host->scsi, or 0x39 for scsi->host. The SCSI channel is cleared 90613177Sgibbs * during initialization. 90713177Sgibbs */ 9084568Sgibbsdma: 9094568Sgibbs mov DFCNTRL,SINDEX 9104568Sgibbsdma1: 91113177Sgibbs test SSTAT0,DMADONE jnz dma3 91213177Sgibbs test SSTAT1,PHASEMIS jz dma1 /* ie. underrun */ 91322451Sgibbs test SSTAT0,SDONE jnz dma3 91422451Sgibbs mov SINDEX,ALLZEROS /* Notify caller of phasemiss */ 9154568Sgibbs 91613177Sgibbs/* 91713177Sgibbs * We will be "done" DMAing when the transfer count goes to zero, or 91813177Sgibbs * the target changes the phase (in light of this, it makes sense that 91913177Sgibbs * the DMA circuitry doesn't ACK when PHASEMIS is active). If we are 92013177Sgibbs * doing a SCSI->Host transfer, the data FIFO should be flushed auto- 92113177Sgibbs * magically on STCNT=0 or a phase change, so just wait for FIFO empty 92213177Sgibbs * status. 92313177Sgibbs */ 9244568Sgibbsdma3: 92522451Sgibbs test DFCNTRL,DIRECTION jnz dma5 9264568Sgibbsdma4: 92713177Sgibbs test DFSTATUS,FIFOEMP jz dma4 9284568Sgibbs 92913177Sgibbs/* 93013177Sgibbs * Now shut the DMA enables off and make sure that the DMA enables are 93113177Sgibbs * actually off first lest we get an ILLSADDR. 93213177Sgibbs */ 9334568Sgibbsdma5: 93421982Sgibbs /* Don't clobber an inprogress host data transfer */ 93521982Sgibbs test DFSTATUS, MREQPEND jnz dma5 93621982Sgibbs /* disable DMA */ 93722451Sgibbs and DFCNTRL, 0xc7 /* ~(SCSIEN|SDMAEN|HDMAEN) */ 9384568Sgibbsdma6: 93922451Sgibbs test DFCNTRL, 0x38 jnz dma6 /* (SCSIEN|SDMAEN|HDMAEN) */ 94018762Sgibbsreturn: 9414568Sgibbs ret 9424568Sgibbs 94313177Sgibbs/* 94413177Sgibbs * Common SCSI initialization for selection and reselection. Expects 94513177Sgibbs * the target SCSI ID to be in the upper four bits of SINDEX, and A's 94613177Sgibbs * contents are stomped on return. 94713177Sgibbs */ 9488104Sgibbsinitialize_scsiid: 94913177Sgibbs and SINDEX,0xf0 /* Get target ID */ 95019164Sgibbs mov SAVED_TCL, SINDEX /* Update the target portion of this */ 9515775Sgibbs and A,0x0f,SCSIID 9525775Sgibbs or SINDEX,A 9538104Sgibbs mov SCSIID,SINDEX ret 9545326Sgibbs 95513177Sgibbs/* 95613177Sgibbs * Assert that if we've been reselected, then we've seen an IDENTIFY 95713177Sgibbs * message. 95813177Sgibbs */ 9594568Sgibbsassert: 96013177Sgibbs test FLAGS,RESELECTED jz return /* reselected? */ 96113177Sgibbs test FLAGS,IDENTIFY_SEEN jnz return /* seen IDENTIFY? */ 9624568Sgibbs 96319164Sgibbs mvi INTSTAT,NO_IDENT ret /* no - tell the kernel */ 9644568Sgibbs 96513177Sgibbs/* 96619218Sgibbs * Locate a disconnected SCB either by SAVED_TCL (ARG_1 is SCB_LIST_NULL) 96719218Sgibbs * or by the SCBIDn ARG_1. The search begins at the SCB index passed in 96819218Sgibbs * via SINDEX. If the SCB cannot be found, SINDEX will be SCB_LIST_NULL, 96919218Sgibbs * otherwise, SCBPTR is set to the proper SCB. 97013177Sgibbs */ 9714568SgibbsfindSCB: 97215328Sgibbs mov SCBPTR,SINDEX /* switch to next SCB */ 97313177Sgibbs test SCB_CONTROL,DISCONNECTED jz findSCB1 /*should be disconnected*/ 97419218Sgibbs cmp ARG_1, SCB_LIST_NULL jne findBySCBID 97519218Sgibbs mov A, SAVED_TCL 97619218Sgibbs cmp SCB_TCL,A je foundSCB /* target ID/channel/lun match? */ 97719164SgibbsfindSCB1: 97819164Sgibbs inc SINDEX 97919164Sgibbs mov A,SCBCOUNT 98019164Sgibbs cmp SINDEX,A jne findSCB 98119164Sgibbs/* 98219164Sgibbs * We didn't find it. If we're paging, pull an SCB and DMA down the 98319164Sgibbs * one we want. If we aren't paging or the SCB we dma down has the 98419218Sgibbs * abort flag set, return not found. 98519164Sgibbs */ 98619218Sgibbs test FLAGS, PAGESCBS jz find_error 98719623Sgibbs mov ALLZEROS call get_free_or_disc_scb 98819218Sgibbs cmp ARG_1, SCB_LIST_NULL jne find_dma_scb 98919218Sgibbs mov SAVED_TCL call index_untagged_scb 99019218Sgibbs mov ARG_1, SINDIR /* SCBID of SCB to fetch */ 99119164Sgibbsfind_dma_scb: 99219164Sgibbs mvi DMAPARAMS, 0xd /* HDMAEN|DIRECTION|FIFORESET */ 99319218Sgibbs mov ARG_1 call dma_scb 99419164Sgibbs test SCB_CONTROL, ABORT_SCB jz return 99522078Sgibbs call add_scb_to_free_list 99619218Sgibbsfind_error: 99719218Sgibbs mvi SINDEX, SCB_LIST_NULL ret 99819218SgibbsfindBySCBID: 99915328Sgibbs mov A, ARG_1 /* Tag passed in ARG_1 */ 100015328Sgibbs cmp SCB_TAG,A jne findSCB1 /* Found it? */ 100115328SgibbsfoundSCB: 100219218Sgibbs test SCB_CONTROL, ABORT_SCB jnz find_error 100319164Sgibbs test FLAGS,PAGESCBS jz return 100419164Sgibbsrem_scb_from_disc_list: 100515328Sgibbs/* Remove this SCB from the disconnection list */ 100615328Sgibbs cmp SCB_NEXT,SCB_LIST_NULL je unlink_prev 100715328Sgibbs mov SAVED_LINKPTR, SCB_PREV 100815328Sgibbs mov SCBPTR, SCB_NEXT 100915328Sgibbs mov SCB_PREV, SAVED_LINKPTR 101015328Sgibbs mov SCBPTR, SINDEX 101115328Sgibbsunlink_prev: 101215328Sgibbs cmp SCB_PREV,SCB_LIST_NULL je rHead/* At the head of the list */ 101315328Sgibbs mov SAVED_LINKPTR, SCB_NEXT 101415328Sgibbs mov SCBPTR, SCB_PREV 101515328Sgibbs mov SCB_NEXT, SAVED_LINKPTR 101619164Sgibbs mov SCBPTR, SINDEX ret 101715328SgibbsrHead: 101819164Sgibbs mov DISCONNECTED_SCBH,SCB_NEXT ret 10194568Sgibbs 102019164Sgibbsset_stcnt_from_hcnt: 102119164Sgibbs mov STCNT0, HCNT0 102219164Sgibbs mov STCNT1, HCNT1 102319164Sgibbs mov STCNT2, HCNT2 ret 10244568Sgibbs 102519164Sgibbsbcopy_7: 102619164Sgibbs mov DINDIR, SINDIR 102719164Sgibbs mov DINDIR, SINDIR 102819164Sgibbsbcopy_5: 102919164Sgibbs mov DINDIR, SINDIR 103019164Sgibbsbcopy_4: 103119164Sgibbs mov DINDIR, SINDIR 103219164Sgibbsbcopy_3: 103319164Sgibbs mov DINDIR, SINDIR 103419164Sgibbs mov DINDIR, SINDIR 103519164Sgibbs mov DINDIR, SINDIR ret 10364568Sgibbs 103719164Sgibbsdma_scb: 103819164Sgibbs /* 103919164Sgibbs * SCB index is in SINDEX. Determine the physical address in 104019164Sgibbs * the host where this SCB is located and load HADDR with it. 104119164Sgibbs */ 104219164Sgibbs shr DINDEX, SINDEX, 3 104319164Sgibbs shl A, SINDEX, 5 104419164Sgibbs add HADDR0, A, HSCB_ADDR0 104519164Sgibbs mov A, DINDEX 104619164Sgibbs adc HADDR1, A, HSCB_ADDR1 104719164Sgibbs clr A 104819164Sgibbs adc HADDR2, A, HSCB_ADDR2 104919164Sgibbs adc HADDR3, A, HSCB_ADDR3 105019164Sgibbs /* Setup Count */ 105119164Sgibbs mvi HCNT0, 28 105219164Sgibbs clr HCNT1 105319164Sgibbs clr HCNT2 105419164Sgibbs mov DFCNTRL, DMAPARAMS 105519164Sgibbs test DMAPARAMS, DIRECTION jnz dma_scb_fromhost 105619164Sgibbs /* Fill it with the SCB data */ 105719164Sgibbs call copy_scb_tofifo 105819164Sgibbs mvi DFCNTRL, 0xa /* HDMAEN | FIFOFLUSH */ 105919164Sgibbsdma_scb_fromhost: 106019164Sgibbs call dma_finish 106119164Sgibbs /* If we were putting the SCB, we are done */ 106219164Sgibbs test DMAPARAMS, DIRECTION jz return 106319164Sgibbs mvi SCBARRAY call dfdat_in_7 106419164Sgibbs call dfdat_in_7_continued 106519164Sgibbs call dfdat_in_7_continued 106619164Sgibbs jmp dfdat_in_7_continued 106719164Sgibbsdfdat_in_7: 106819164Sgibbs mov DINDEX,SINDEX 106919164Sgibbsdfdat_in_7_continued: 107019164Sgibbs mov DINDIR,DFDAT 107119164Sgibbs mov DINDIR,DFDAT 107219164Sgibbs mov DINDIR,DFDAT 107319164Sgibbs mov DINDIR,DFDAT 107419164Sgibbs mov DINDIR,DFDAT 107519164Sgibbs mov DINDIR,DFDAT 107619164Sgibbs mov DINDIR,DFDAT ret 107719164Sgibbs 107819164Sgibbscopy_scb_tofifo: 107919164Sgibbs mvi SCBARRAY call dfdat_out_7 108019164Sgibbs call dfdat_out_7 108119164Sgibbs call dfdat_out_7 108219164Sgibbsdfdat_out_7: 108319164Sgibbs mov DFDAT,SINDIR 108419164Sgibbs mov DFDAT,SINDIR 108519164Sgibbs mov DFDAT,SINDIR 108619164Sgibbs mov DFDAT,SINDIR 108719164Sgibbs mov DFDAT,SINDIR 108819164Sgibbs mov DFDAT,SINDIR 108919164Sgibbs mov DFDAT,SINDIR ret 109019164Sgibbs 109113177Sgibbs/* 109219164Sgibbs * Wait for DMA from host memory to data FIFO to complete, then disable 109319164Sgibbs * DMA and wait for it to acknowledge that it's off. 109413177Sgibbs */ 109519164Sgibbsdma_finish: 109619164Sgibbs test DFSTATUS,HDONE jz dma_finish 109722234Sgibbs /* Turn off DMA */ 109822234Sgibbs and DFCNTRL, 0xf7 ret # ~HDMAEN 10999928Sgibbs 110019164Sgibbsindex_untagged_scb: 110119218Sgibbs mov DINDEX, SINDEX 110219218Sgibbs shr DINDEX, 4 110319218Sgibbs and DINDEX, 0x03 /* Bottom two bits of tid */ 110419218Sgibbs add DINDEX, SCB_ACTIVE0 110519218Sgibbs shr A, SINDEX, 6 /* Target ID divided by 4 */ 110619421Sgibbs test SINDEX, SELBUSB jz index_untagged_scb2 110719421Sgibbs add A, 2 /* Add 2 positions */ 110819164Sgibbsindex_untagged_scb2: 110919164Sgibbs mov SCBPTR, A /* 111019164Sgibbs * Select the SCB with this 111119164Sgibbs * target's information. 111219164Sgibbs */ 111319218Sgibbs mov SINDEX, DINDEX ret 11149928Sgibbs 11154568Sgibbs 111619164Sgibbsget_free_or_disc_scb: 111719623Sgibbs cmp FREE_SCBH, SCB_LIST_NULL jne dequeue_free_scb 111819623Sgibbs cmp DISCONNECTED_SCBH, SCB_LIST_NULL jne dequeue_disc_scb 111919623Sgibbsreturn_error: 112019623Sgibbs mvi SINDEX, SCB_LIST_NULL ret 112119623Sgibbsdequeue_disc_scb: 112219164Sgibbs mov SCBPTR, DISCONNECTED_SCBH 112313177Sgibbs/* 112419164Sgibbs * If we have a residual, then we are in the middle of some I/O 112519164Sgibbs * and we have to send this SCB back up to the kernel so that the 112619164Sgibbs * saved data pointers and residual information isn't lost. 112719164Sgibbs */ 112819164Sgibbs test SCB_RESID_SGCNT,0xff jz unlink_disc_scb 112919164Sgibbs mvi DMAPARAMS, 0x9 /* HDMAEN | FIFORESET*/ 113019164Sgibbs mov SCB_TAG call dma_scb 113119164Sgibbsunlink_disc_scb: 113219623Sgibbs /* jmp instead of call since we want to return anyway */ 113319623Sgibbs mov SCBPTR jmp rem_scb_from_disc_list 113419164Sgibbsdequeue_free_scb: 113519164Sgibbs mov SCBPTR, FREE_SCBH 113619164Sgibbs mov FREE_SCBH, SCB_NEXT ret 11374568Sgibbs 113819164Sgibbsadd_scb_to_free_list: 113919164Sgibbs mov SCB_NEXT, FREE_SCBH 114019164Sgibbs mov FREE_SCBH, SCBPTR ret 11414568Sgibbs 114219164Sgibbsadd_scb_to_disc_list: 114313177Sgibbs/* 114419164Sgibbs * Link this SCB into the DISCONNECTED list. This list holds the 114519164Sgibbs * candidates for paging out an SCB if one is needed for a new command. 114619164Sgibbs * Modifying the disconnected list is a critical(pause dissabled) section. 114713177Sgibbs */ 114819164Sgibbs mvi SCB_PREV, SCB_LIST_NULL 114919164Sgibbs mov SCB_NEXT, DISCONNECTED_SCBH 115019164Sgibbs mov DISCONNECTED_SCBH, SCBPTR 115119164Sgibbs cmp SCB_NEXT,SCB_LIST_NULL je return 115219164Sgibbs mov SCBPTR,SCB_NEXT 115319164Sgibbs mov SCB_PREV,DISCONNECTED_SCBH 115419164Sgibbs mov SCBPTR,DISCONNECTED_SCBH ret 11554568Sgibbs 1156