aic7xxx.seq revision 19921
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 4219921SgibbsVERSION AIC7XXX_SEQ_VER "$Id: aic7xxx.seq,v 1.50 1996/11/21 06:18:33 gibbs Exp $" 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: 8719921Sgibbs mvi LASTPHASE, P_BUSFREE 8819921Sgibbs 8913177Sgibbsstart: 9019164Sgibbs and FLAGS,0x07 /* clear target specific flags */ 9113177Sgibbs mvi SCSISEQ,ENRSELI /* Always allow reselection */ 9216198Sgibbs clr SCSIRATE /* 9316198Sgibbs * We don't know the target we will 9416198Sgibbs * connect to, so default to narrow 9516198Sgibbs * transfers to avoid parity problems. 9616198Sgibbs */ 978104Sgibbspoll_for_work: 9813177Sgibbs /* 9913177Sgibbs * Are we a twin channel device? 10013177Sgibbs * For fairness, we check the other bus first, 10113177Sgibbs * since we just finished a transaction on the 10213177Sgibbs * current channel. 10313177Sgibbs */ 10413177Sgibbs test FLAGS,TWIN_BUS jz start2 10513177Sgibbs xor SBLKCTL,SELBUSB /* Toggle to the other bus */ 1068104Sgibbs test SSTAT0,SELDI jnz reselect 10713177Sgibbs xor SBLKCTL,SELBUSB /* Toggle to the original bus */ 1085326Sgibbsstart2: 1098104Sgibbs test SSTAT0,SELDI jnz reselect 11019164Sgibbs cmp WAITING_SCBH,SCB_LIST_NULL je test_queue 11119164Sgibbsstart_waiting: 11219164Sgibbs /* 11319164Sgibbs * Pull the first entry off of the waiting SCB list 11419164Sgibbs * We don't have to "test_busy" because only transactions that 11519164Sgibbs * have passed that test can be in the WAITING_SCB list. 11619164Sgibbs */ 11719164Sgibbs mov SCBPTR,WAITING_SCBH 11819164Sgibbs jmp start_scb2 11919164Sgibbstest_queue: 12019164Sgibbs /* Has the driver posted any work for us? */ 12114934Sgibbs mov A, QCNTMASK 12214934Sgibbs test QINCNT,A jz poll_for_work 1234568Sgibbs 12413690Sgibbs/* 12513690Sgibbs * We have at least one queued SCB now and we don't have any 12619164Sgibbs * SCBs in the list of SCBs awaiting selection. If we have 12719164Sgibbs * any SCBs availible for use, pull the tag from the QINFIFO 12819164Sgibbs * and get to work on it. 12913177Sgibbs */ 13019164Sgibbs test FLAGS, PAGESCBS jz dequeue_scb 13119623Sgibbs mov ALLZEROS call get_free_or_disc_scb 13219164Sgibbs cmp SINDEX, SCB_LIST_NULL je poll_for_work 13319164Sgibbsdequeue_scb: 13419164Sgibbs mov CUR_SCBID,QINFIFO 13519164Sgibbs test FLAGS, PAGESCBS jnz dma_queued_scb 13619164Sgibbs /* In the non-paging case, the SCBID == hardware SCB index */ 13719164Sgibbs mov SCBPTR, CUR_SCBID 13819164Sgibbsdma_queued_scb: 13919164Sgibbs/* 14019164Sgibbs * DMA the SCB from host ram into the current SCB location. 14119164Sgibbs */ 14219164Sgibbs mvi DMAPARAMS, 0xd /* HDMAEN|DIRECTION|FIFORESET */ 14319164Sgibbs mov CUR_SCBID call dma_scb 1444568Sgibbs 14513177Sgibbs/* 14613177Sgibbs * See if there is not already an active SCB for this target. This code 14713177Sgibbs * locks out on a per target basis instead of target/lun. Although this 14813177Sgibbs * is not ideal for devices that have multiple luns active at the same 14913177Sgibbs * time, it is faster than looping through all SCB's looking for active 15019921Sgibbs * commands. We also don't have enough spare SCB space for us to store the 15119164Sgibbs * SCBID of the currently busy transaction for each target/lun making it 15219164Sgibbs * impossible to link up the SCBs. 15313177Sgibbs */ 1545647Sgibbstest_busy: 15519164Sgibbs test SCB_CONTROL, TAG_ENB jnz start_scb 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 17719218Sgibbs * only happen if the parent SCB was aborted and this 17819218Sgibbs * one was already here at the time of the abort. 17919218Sgibbs */ 18019218Sgibbs cmp SINDEX, SCB_LIST_NULL jne paged_busy_link 18119218Sgibbs mvi INTSTAT, NO_MATCH_BUSY 18219218Sgibbspaged_busy_link: 18319164Sgibbs /* Link us in */ 18419164Sgibbs mov SCB_LINKED_NEXT, CUR_SCBID 18519164Sgibbs /* Put it back on the disconnected list */ 18619164Sgibbs call add_scb_to_disc_list 1878104Sgibbs jmp poll_for_work 18819164Sgibbssimple_busy_link: 18919164Sgibbs mov SCBPTR, ARG_1 19019164Sgibbs mov SCB_LINKED_NEXT, CUR_SCBID 19119164Sgibbs jmp poll_for_work 19219164Sgibbsmake_busy: 19319164Sgibbs mov DINDIR, CUR_SCBID 19419164Sgibbs mov SCBPTR, SAVED_SCBPTR 1954568Sgibbs 1965326Sgibbsstart_scb: 19719164Sgibbs /* 19819164Sgibbs * Place us on the waiting list in case our selection 19919164Sgibbs * doesn't win during bus arbitration. 20019164Sgibbs */ 20115328Sgibbs mov SCB_NEXT,WAITING_SCBH 20213177Sgibbs mov WAITING_SCBH, SCBPTR 20313177Sgibbsstart_scb2: 20413177Sgibbs and SINDEX,0xf7,SBLKCTL /* Clear the channel select bit */ 20513177Sgibbs and A,0x08,SCB_TCL /* Get new channel bit */ 20613177Sgibbs or SINDEX,A 20713177Sgibbs mov SBLKCTL,SINDEX /* select channel */ 20813177Sgibbs mov SCB_TCL call initialize_scsiid 2098104Sgibbs 21013177Sgibbs/* 21113177Sgibbs * Enable selection phase as an initiator, and do automatic ATN 21213177Sgibbs * after the selection. We do this now so that we can overlap the 21313177Sgibbs * rest of our work to set up this target with the arbitration and 21413177Sgibbs * selection bus phases. 21513177Sgibbs */ 2168104Sgibbsstart_selection: 21713177Sgibbs mvi SCSISEQ,0x58 /* ENSELO|ENAUTOATNO|ENRSELI */ 2184568Sgibbs 21913177Sgibbs/* 22013177Sgibbs * As soon as we get a successful selection, the target should go 22113177Sgibbs * into the message out phase since we have ATN asserted. Prepare 22213177Sgibbs * the message to send. 22313177Sgibbs * 22413177Sgibbs * Messages are stored in scratch RAM starting with a length byte 22513177Sgibbs * followed by the message itself. 22613177Sgibbs */ 2278567Sdg 22813177Sgibbsmk_identify: 22919164Sgibbs and MSG0,0x7,SCB_TCL /* lun */ 23013177Sgibbs and A,DISCENB,SCB_CONTROL /* mask off disconnect privledge */ 23113690Sgibbs or MSG0,A /* or in disconnect privledge */ 23218762Sgibbs or MSG0,MSG_IDENTIFYFLAG 23313690Sgibbs mvi MSG_LEN, 1 2344568Sgibbs 23513177Sgibbs/* 23615328Sgibbs * Send a tag message if TAG_ENB is set in the SCB control block. 23715328Sgibbs * Use SCB_TAG (the position in the kernel's SCB array) as the tag value. 23813177Sgibbs */ 2396608Sgibbsmk_tag: 24018762Sgibbs test SCB_CONTROL,TAG_ENB jz mk_message 24119164Sgibbs and MSG1,0x23,SCB_CONTROL 24219164Sgibbs mov MSG2,SCB_TAG 24319164Sgibbs add MSG_LEN,2 /* update message length */ 2446608Sgibbs 24518762Sgibbs/* 24618762Sgibbs * Interrupt the driver, and allow it to tweak the message buffer 24718762Sgibbs * if it asks. 24818762Sgibbs */ 24918762Sgibbsmk_message: 25018762Sgibbs test SCB_CONTROL,MK_MESSAGE jz wait_for_selection 2516608Sgibbs 25218762Sgibbs mvi INTSTAT,AWAITING_MSG 2536608Sgibbs 2549917Sgibbswait_for_selection: 25513177Sgibbs test SSTAT0,SELDO jnz select 25613177Sgibbs test SSTAT0,SELDI jz wait_for_selection 2574568Sgibbs 25813177Sgibbs/* 25913177Sgibbs * Reselection has been initiated by a target. Make a note that we've been 26019164Sgibbs * reselected, but haven't seen an IDENTIFY message from the target yet. 26113177Sgibbs */ 2624568Sgibbsreselect: 26313177Sgibbs clr MSG_LEN /* Don't have anything in the mesg buffer */ 2648104Sgibbs mov SELID call initialize_scsiid 26513177Sgibbs or FLAGS,RESELECTED 26613177Sgibbs jmp select2 2674568Sgibbs 26813177Sgibbs/* 26919164Sgibbs * After the selection, remove this SCB from the "waiting SCB" 27013177Sgibbs * list. This is achieved by simply moving our "next" pointer into 27113177Sgibbs * WAITING_SCBH. Our next pointer will be set to null the next time this 27213177Sgibbs * SCB is used, so don't bother with it now. 27313177Sgibbs */ 2748104Sgibbsselect: 27515328Sgibbs mov WAITING_SCBH,SCB_NEXT 2768104Sgibbsselect2: 27713177Sgibbs/* 27813177Sgibbs * Initialize SCSIRATE with the appropriate value for this target. 27919164Sgibbs * The SCSIRATE settings for each target are stored in an array 28019164Sgibbs * based at TARG_SCRATCH. 28113177Sgibbs */ 28219164Sgibbsndx_dtr: 28319164Sgibbs shr A,SCSIID,4 28419164Sgibbs test SBLKCTL,SELBUSB jz ndx_dtr_2 28519164Sgibbs or SAVED_TCL, SELBUSB /* Add the channel bit while we're here */ 28619164Sgibbs or A,0x08 /* Channel B entries add 8 */ 28719164Sgibbsndx_dtr_2: 28819164Sgibbs add SINDEX,TARG_SCRATCH,A 28913177Sgibbs mov SCSIRATE,SINDIR 29013177Sgibbs 29115843Sgibbs/* 29219164Sgibbs * Initialize Ultra mode setting and clear the SCSI channel. 29315843Sgibbs */ 29419164Sgibbsultra: 29519164Sgibbs and DINDEX,0xdf,SXFRCTL0 /* default to Ultra disabled */ 29619164Sgibbs /* 29719164Sgibbs * Set CLRCHN here before the target has entered a data transfer mode - 29819164Sgibbs * with synchronous SCSI, if you do it later, you blow away some 29919164Sgibbs * data in the SCSI FIFO that the target has already sent to you. 30019164Sgibbs */ 30119164Sgibbs or DINDEX, CLRCHN 30219164Sgibbs mvi SINDEX, ULTRA_ENB_B 30319164Sgibbs test SCSIID, 0x80 jnz ultra_2 /* Target ID > 7 */ 30419164Sgibbs test SBLKCTL, SELBUSB jnz ultra_2 /* Second channel device */ 30519164Sgibbs dec SINDEX 30619164Sgibbsultra_2: 30719164Sgibbs mov FUNCTION1,SCSIID 30819164Sgibbs mov A,FUNCTION1 30919164Sgibbs test SINDIR, A jz set_sxfrctl0 31019164Sgibbs or DINDEX, ULTRAEN 31119164Sgibbs 31215843Sgibbsset_sxfrctl0: 31319164Sgibbs mov SXFRCTL0,DINDEX 31415843Sgibbs 31516198Sgibbs mvi SCSISEQ,ENAUTOATNP /* 31616198Sgibbs * ATN on parity errors 31716198Sgibbs * for "in" phases 31813177Sgibbs */ 31913177Sgibbs mvi CLRSINT1,CLRBUSFREE 32013177Sgibbs mvi CLRSINT0,0x60 /* CLRSELDI|CLRSELDO */ 32119921Sgibbs or SIMODE1, ENBUSFREE /* 32219921Sgibbs * We aren't expecting a 32319921Sgibbs * bus free, so interrupt 32419921Sgibbs * the kernel driver if it 32519921Sgibbs * happens. 32619921Sgibbs */ 32713177Sgibbs/* 32813177Sgibbs * Main loop for information transfer phases. If BSY is false, then 32913177Sgibbs * we have a bus free condition, expected or not. Otherwise, wait 33013177Sgibbs * for the target to assert REQ before checking MSG, C/D and I/O 33113177Sgibbs * for the bus phase. 33213177Sgibbs * 33313177Sgibbs */ 3344568SgibbsITloop: 33513177Sgibbs test SSTAT1,BUSFREE jnz p_busfree 33613177Sgibbs test SSTAT1,REQINIT jz ITloop 3374568Sgibbs 33813177Sgibbs and A,PHASE_MASK,SCSISIGI 33913690Sgibbs mov LASTPHASE,A 34013690Sgibbs mov SCSISIGO,A 3414568Sgibbs 3424568Sgibbs cmp ALLZEROS,A je p_dataout 34313177Sgibbs cmp A,P_DATAIN je p_datain 34413177Sgibbs cmp A,P_COMMAND je p_command 34513177Sgibbs cmp A,P_MESGOUT je p_mesgout 34613177Sgibbs cmp A,P_STATUS je p_status 34713177Sgibbs cmp A,P_MESGIN je p_mesgin 3484568Sgibbs 34913177Sgibbs mvi INTSTAT,BAD_PHASE /* unknown phase - signal driver */ 35015843Sgibbs jmp ITloop /* Try reading the bus again. */ 3514568Sgibbs 3524568Sgibbsp_dataout: 35313177Sgibbs mvi DMAPARAMS,0x7d /* 35413177Sgibbs * WIDEODD|SCSIEN|SDMAEN|HDMAEN| 35513177Sgibbs * DIRECTION|FIFORESET 35613177Sgibbs */ 3579928Sgibbs jmp data_phase_init 3584568Sgibbs 35913177Sgibbs/* 36013177Sgibbs * If we re-enter the data phase after going through another phase, the 36113177Sgibbs * STCNT may have been cleared, so restore it from the residual field. 36213177Sgibbs */ 3639928Sgibbsdata_phase_reinit: 36419231Sgibbs mvi DINDEX, STCNT0 36519231Sgibbs mvi SCB_RESID_DCNT0 call bcopy_3 3669928Sgibbs jmp data_phase_loop 3674568Sgibbs 3689928Sgibbsp_datain: 36913177Sgibbs mvi DMAPARAMS,0x79 /* 37013177Sgibbs * WIDEODD|SCSIEN|SDMAEN|HDMAEN| 37113177Sgibbs * !DIRECTION|FIFORESET 37213177Sgibbs */ 3739928Sgibbsdata_phase_init: 37419164Sgibbs call assert /* 37519164Sgibbs * Ensure entering a data 37619164Sgibbs * phase is okay - seen identify, etc. 37719164Sgibbs */ 3785775Sgibbs 3799928Sgibbs test FLAGS, DPHASE jnz data_phase_reinit 3804568Sgibbs 38119164Sgibbs /* 38219164Sgibbs * Initialize the DMA address and counter from the SCB. 38319164Sgibbs * Also set SG_COUNT and SG_NEXT in memory since we cannot 38419164Sgibbs * modify the values in the SCB itself until we see a 38519164Sgibbs * save data pointers message. 38619164Sgibbs */ 38719164Sgibbs mvi DINDEX, HADDR0 38819164Sgibbs mvi SCB_DATAPTR call bcopy_7 38919164Sgibbs 39019164Sgibbs call set_stcnt_from_hcnt 39119164Sgibbs 39219164Sgibbs mov SG_COUNT,SCB_SGCOUNT 39319164Sgibbs 39419164Sgibbs mvi DINDEX, SG_NEXT 39519164Sgibbs mvi SCB_SGPTR call bcopy_4 39619164Sgibbs 39719164Sgibbs /* We have seen a data phase */ 39819164Sgibbs or FLAGS, DPHASE 39919164Sgibbs 4009928Sgibbsdata_phase_loop: 40116260Sgibbs/* Guard against overruns */ 40216260Sgibbs test SG_COUNT, 0xff jnz data_phase_inbounds 40316260Sgibbs/* 40416260Sgibbs * Turn on 'Bit Bucket' mode, set the transfer count to 40516260Sgibbs * 16meg and let the target run until it changes phase. 40616260Sgibbs * When the transfer completes, notify the host that we 40716260Sgibbs * had an overrun. 40816260Sgibbs */ 40916260Sgibbs or SXFRCTL1,BITBUCKET 41019921Sgibbs and DMAPARAMS, 0xf7 /* Turn off HDMAEN */ 41116260Sgibbs mvi STCNT0,0xff 41216260Sgibbs mvi STCNT1,0xff 41316260Sgibbs mvi STCNT2,0xff 41416260Sgibbs 41516260Sgibbsdata_phase_inbounds: 41619164Sgibbs/* If we are the last SG block, ensure wideodd is off. */ 4179928Sgibbs cmp SG_COUNT,0x01 jne data_phase_wideodd 41813177Sgibbs and DMAPARAMS, 0xbf /* Turn off WIDEODD */ 4199928Sgibbsdata_phase_wideodd: 4209928Sgibbs mov DMAPARAMS call dma 4214568Sgibbs 42216260Sgibbs/* Go tell the host about any overruns */ 42316260Sgibbs test SXFRCTL1,BITBUCKET jnz data_phase_overrun 42416260Sgibbs 42513177Sgibbs/* Exit if we had an underrun */ 42613177Sgibbs test SSTAT0,SDONE jz data_phase_finish /* underrun STCNT != 0 */ 4277532Sgibbs 42813177Sgibbs/* 42913177Sgibbs * Advance the scatter-gather pointers if needed 43013177Sgibbs */ 4319928Sgibbssg_advance: 43213177Sgibbs dec SG_COUNT /* one less segment to go */ 4334568Sgibbs 43413177Sgibbs test SG_COUNT, 0xff jz data_phase_finish /* Are we done? */ 4354568Sgibbs 43613177Sgibbs clr A /* add sizeof(struct scatter) */ 43713177Sgibbs add SG_NEXT0,SG_SIZEOF,SG_NEXT0 43813177Sgibbs adc SG_NEXT1,A,SG_NEXT1 4394568Sgibbs 44013177Sgibbs/* 44113177Sgibbs * Load a struct scatter and set up the data address and length. 44213177Sgibbs * If the working value of the SG count is nonzero, then 44313177Sgibbs * we need to load a new set of values. 44413177Sgibbs * 44515328Sgibbs * This, like all DMA's, assumes little-endian host data storage. 44613177Sgibbs */ 4479928Sgibbssg_load: 44813177Sgibbs clr HCNT2 44913177Sgibbs clr HCNT1 45013177Sgibbs mvi HCNT0,SG_SIZEOF 4514568Sgibbs 45219164Sgibbs mvi DINDEX, HADDR0 45319164Sgibbs mvi SG_NEXT0 call bcopy_4 4544568Sgibbs 45513690Sgibbs or DFCNTRL,0xd /* HDMAEN|DIRECTION|FIFORESET */ 4569928Sgibbs 45719164Sgibbs call dma_finish 4589928Sgibbs 45913177Sgibbs/* 46013177Sgibbs * Copy data from FIFO into SCB data pointer and data count. This assumes 46119164Sgibbs * that the SG segments are of the form: 46213177Sgibbs * 46313177Sgibbs * struct ahc_dma_seg { 46419164Sgibbs * u_int32_t addr; four bytes, little-endian order 46519164Sgibbs * u_int32_t len; four bytes, little endian order 46613177Sgibbs * }; 46713177Sgibbs */ 46819164Sgibbs mvi HADDR0 call dfdat_in_7 4699928Sgibbs 47013177Sgibbs/* Load STCNT as well. It is a mirror of HCNT */ 47119164Sgibbs call set_stcnt_from_hcnt 47219164Sgibbs test SSTAT1,PHASEMIS jz data_phase_loop 4734568Sgibbs 4749928Sgibbsdata_phase_finish: 47513177Sgibbs/* 47613177Sgibbs * After a DMA finishes, save the SG and STCNT residuals back into the SCB 47713177Sgibbs * We use STCNT instead of HCNT, since it's a reflection of how many bytes 47813177Sgibbs * were transferred on the SCSI (as opposed to the host) bus. 47913177Sgibbs */ 48013690Sgibbs mov SCB_RESID_DCNT0,STCNT0 48113690Sgibbs mov SCB_RESID_DCNT1,STCNT1 48213690Sgibbs mov SCB_RESID_DCNT2,STCNT2 48313177Sgibbs mov SCB_RESID_SGCNT, SG_COUNT 4844568Sgibbs jmp ITloop 4854568Sgibbs 48616260Sgibbsdata_phase_overrun: 48713177Sgibbs/* 48816260Sgibbs * Turn off BITBUCKET mode and notify the host 48916260Sgibbs */ 49016260Sgibbs and SXFRCTL1,0x7f /* ~BITBUCKET */ 49116260Sgibbs mvi INTSTAT,DATA_OVERRUN 49216260Sgibbs jmp ITloop 49316260Sgibbs 49416260Sgibbs/* 49515328Sgibbs * Command phase. Set up the DMA registers and let 'er rip. 49613177Sgibbs */ 4974568Sgibbsp_command: 4984568Sgibbs call assert 4994568Sgibbs 50013177Sgibbs/* 50115328Sgibbs * Load HADDR and HCNT. 50213177Sgibbs */ 50319164Sgibbs mvi DINDEX, HADDR0 50419164Sgibbs mvi SCB_CMDPTR call bcopy_5 50513690Sgibbs clr HCNT1 50613690Sgibbs clr HCNT2 5074568Sgibbs 50819164Sgibbs call set_stcnt_from_hcnt 5094568Sgibbs 5104568Sgibbs mvi 0x3d call dma # SCSIEN|SDMAEN|HDMAEN| 5114568Sgibbs # DIRECTION|FIFORESET 5124568Sgibbs jmp ITloop 5134568Sgibbs 51413177Sgibbs/* 51513177Sgibbs * Status phase. Wait for the data byte to appear, then read it 51613177Sgibbs * and store it into the SCB. 51713177Sgibbs */ 5184568Sgibbsp_status: 51919803Sgibbs call assert 52019803Sgibbs 52113177Sgibbs mvi SCB_TARGET_STATUS call inb_first 5229954Sgibbs jmp mesgin_done 5234568Sgibbs 52413177Sgibbs/* 52515328Sgibbs * Message out phase. If there is not an active message, but the target 52613177Sgibbs * took us into this phase anyway, build a no-op message and send it. 52713177Sgibbs */ 5284568Sgibbsp_mesgout: 52913177Sgibbs test MSG_LEN, 0xff jnz p_mesgout_start 53018762Sgibbs mvi MSG_NOOP call mk_mesg /* build NOP message */ 53113177Sgibbsp_mesgout_start: 53213177Sgibbs/* 53313177Sgibbs * Set up automatic PIO transfer from MSG0. Bit 3 in 53413177Sgibbs * SXFRCTL0 (SPIOEN) is already on. 53513177Sgibbs */ 53613177Sgibbs mvi SINDEX,MSG0 5374568Sgibbs mov DINDEX,MSG_LEN 5384568Sgibbs 53913177Sgibbs/* 54013177Sgibbs * When target asks for a byte, drop ATN if it's the last one in 54113177Sgibbs * the message. Otherwise, keep going until the message is exhausted. 54213177Sgibbs * 54313177Sgibbs * Keep an eye out for a phase change, in case the target issues 54413177Sgibbs * a MESSAGE REJECT. 54513177Sgibbs */ 54613177Sgibbsp_mesgout_loop: 54719906Sgibbs test SSTAT0,SPIORDY jz p_mesgout_loop 54819906Sgibbs test SSTAT1,PHASEMIS jnz p_mesgout_done 54913177Sgibbs/* 55013177Sgibbs * If the next bus phase after ATN drops is a message out, it means 55113177Sgibbs * that the target is requesting that the last message(s) be resent. 55213177Sgibbs */ 55319921Sgibbsp_mesgout_dropatn: 55419921Sgibbs cmp DINDEX,1 jne p_mesgout_testretry /* last byte? */ 55519921Sgibbs mvi CLRSINT1,CLRATNO /* drop ATN */ 55619921Sgibbsp_mesgout_testretry: 55719906Sgibbs test DINDEX,0xff jnz p_mesgout_outb 55819906Sgibbs or SCSISIGO,ATNO /* turn on ATN for the retry */ 55919906Sgibbs jmp p_mesgout_start 56019906Sgibbsp_mesgout_outb: 56119906Sgibbs dec DINDEX 56219906Sgibbs mvi CLRSINT0, CLRSPIORDY 56319906Sgibbs mov SCSIDATL,SINDIR 56419906Sgibbs jmp p_mesgout_loop 5654568Sgibbs 56619906Sgibbsp_mesgout_done: 56715328Sgibbs mvi CLRSINT1,CLRATNO /* Be sure to turn ATNO off */ 56813177Sgibbs clr MSG_LEN /* no active msg */ 5694568Sgibbs jmp ITloop 5704568Sgibbs 57113177Sgibbs/* 57213177Sgibbs * Message in phase. Bytes are read using Automatic PIO mode. 57313177Sgibbs */ 5744568Sgibbsp_mesgin: 57513177Sgibbs mvi A call inb_first /* read the 1st message byte */ 57613177Sgibbs mov REJBYTE,A /* save it for the driver */ 5774568Sgibbs 57818762Sgibbs test A,MSG_IDENTIFYFLAG jnz mesgin_identify 57913177Sgibbs cmp A,MSG_DISCONNECT je mesgin_disconnect 58018762Sgibbs cmp A,MSG_SAVEDATAPOINTER je mesgin_sdptrs 58113177Sgibbs cmp ALLZEROS,A je mesgin_complete 58218762Sgibbs cmp A,MSG_RESTOREPOINTERS je mesgin_rdptrs 58313177Sgibbs cmp A,MSG_EXTENDED je mesgin_extended 58418762Sgibbs cmp A,MSG_MESSAGE_REJECT je mesgin_reject 5854568Sgibbs 5869954Sgibbsrej_mesgin: 58713177Sgibbs/* 58819164Sgibbs * We have no idea what this message in is, so we issue a message reject 58919164Sgibbs * and hope for the best. In any case, rejection should be a rare 59019164Sgibbs * occurrence - signal the driver when it happens. 59113177Sgibbs */ 59213177Sgibbs mvi INTSTAT,SEND_REJECT /* let driver know */ 5939954Sgibbs 59418762Sgibbs mvi MSG_MESSAGE_REJECT call mk_mesg 5959954Sgibbs 5969954Sgibbsmesgin_done: 59713177Sgibbs call inb_last /*ack & turn auto PIO back on*/ 5989954Sgibbs jmp ITloop 5999954Sgibbs 6009954Sgibbs 6019954Sgibbsmesgin_complete: 60213177Sgibbs/* 60319164Sgibbs * We got a "command complete" message, so put the SCB_TAG into the QOUTFIFO, 60419164Sgibbs * and trigger a completion interrupt. Before doing so, check to see if there 60519164Sgibbs * is a residual or the status byte is something other than NO_ERROR (0). In 60619164Sgibbs * either of these conditions, we upload the SCB back to the host so it can 60719164Sgibbs * process this information. In the case of a non zero status byte, we 60819164Sgibbs * additionally interrupt the kernel driver synchronously, allowing it to 60919164Sgibbs * decide if sense should be retrieved. If the kernel driver wishes to request 61019164Sgibbs * sense, it will fill the kernel SCB with a request sense command and set 61119164Sgibbs * RETURN_1 to SEND_SENSE. If RETURN_1 is set to SEND_SENSE we redownload 61219164Sgibbs * the SCB, and process it as the next command by adding it to the waiting list. 61319164Sgibbs * If the kernel driver does not wish to request sense, it need only clear 61419164Sgibbs * RETURN_1, and the command is allowed to complete normally. We don't bother 61519164Sgibbs * to post to the QOUTFIFO in the error cases since it would require extra 61619164Sgibbs * work in the kernel driver to ensure that the entry was removed before the 61719164Sgibbs * command complete code tried processing it. 61813177Sgibbs */ 61919164Sgibbs 62013177Sgibbs/* 62119921Sgibbs * We expect to go to bus free after this message. 62219921Sgibbs */ 62319921Sgibbs and SIMODE1, 0xf7 /* ~ENBUSFREE */ 62419921Sgibbs/* 62519164Sgibbs * First check for residuals 62613177Sgibbs */ 62719164Sgibbs test SCB_RESID_SGCNT,0xff jnz upload_scb 62819164Sgibbs test SCB_TARGET_STATUS,0xff jz status_ok /* Good Status? */ 62919164Sgibbsupload_scb: 63019164Sgibbs mvi DMAPARAMS, 0x9 /* HDMAEN | FIFORESET*/ 63119164Sgibbs mov SCB_TAG call dma_scb 6327532Sgibbscheck_status: 63319164Sgibbs test SCB_TARGET_STATUS,0xff jz status_ok /* Just a residual? */ 63413177Sgibbs mvi INTSTAT,BAD_STATUS /* let driver know */ 63513177Sgibbs cmp RETURN_1, SEND_SENSE jne status_ok 63619164Sgibbs /* This SCB becomes the next to execute as it will retrieve sense */ 63719164Sgibbs mov SCB_LINKED_NEXT, SCB_TAG 63819164Sgibbs jmp dma_next_scb 6395326Sgibbs 6404568Sgibbsstatus_ok: 64113177Sgibbs/* First, mark this target as free. */ 64219921Sgibbs test SCB_CONTROL,TAG_ENB jnz complete /* 64313177Sgibbs * Tagged commands 64413177Sgibbs * don't busy the 64513177Sgibbs * target. 64613177Sgibbs */ 64719164Sgibbs mov SAVED_SCBPTR, SCBPTR 64819164Sgibbs mov SAVED_LINKPTR, SCB_LINKED_NEXT 64919218Sgibbs mov SCB_TCL call index_untagged_scb 65019164Sgibbs mov DINDIR, SAVED_LINKPTR 65119164Sgibbs mov SCBPTR, SAVED_SCBPTR 6525326Sgibbs 6535326Sgibbscomplete: 65419623Sgibbs test FLAGS, PAGESCBS jz complete_post 65519623Sgibbs mov A, QFULLCNT 65619623Sgibbscomplete_poll: 65719623Sgibbs cmp QOUTQCNT, A je complete_poll 65819803Sgibbs mvi SEQCTL,0x50 /* PAUSEDIS|FASTMODE */ 65919623Sgibbs inc QOUTQCNT 66019623Sgibbscomplete_post: 66119164Sgibbs /* Post the SCB and issue an interrupt */ 66215328Sgibbs mov QOUTFIFO,SCB_TAG 66319803Sgibbs mvi SEQCTL,0x10 /* FASTMODE */ 6647532Sgibbs mvi INTSTAT,CMDCMPLT 66519164Sgibbs 66619164Sgibbsdma_next_scb: 66719921Sgibbs cmp SCB_LINKED_NEXT, SCB_LIST_NULL je add_to_free_list 66819164Sgibbs test FLAGS, PAGESCBS jnz dma_next_scb2 66919164Sgibbs /* Only DMA on top of ourselves if we are the SCB to download */ 67019164Sgibbs mov A, SCB_LINKED_NEXT 67119164Sgibbs cmp SCB_TAG, A je dma_next_scb2 67219164Sgibbs mov SCBPTR, A 67319164Sgibbs jmp add_to_waiting_list 67419164Sgibbsdma_next_scb2: 67519164Sgibbs mvi DMAPARAMS, 0xd /* HDMAEN|DIRECTION|FIFORESET */ 67619218Sgibbs mov SCB_LINKED_NEXT call dma_scb 67719164Sgibbsadd_to_waiting_list: 67819164Sgibbs mov SCB_NEXT,WAITING_SCBH 67919164Sgibbs mov WAITING_SCBH, SCBPTR 6809954Sgibbs jmp mesgin_done 68119921Sgibbsadd_to_free_list: 68219921Sgibbs call add_scb_to_free_list 68319921Sgibbs jmp mesgin_done 6844568Sgibbs 68513177Sgibbs/* 68618762Sgibbs * Is it an extended message? Copy the message to our message buffer and 68718762Sgibbs * notify the host. The host will tell us whether to reject this message, 68818762Sgibbs * respond to it with the message that the host placed in our message buffer, 68918762Sgibbs * or simply to do nothing. 69013177Sgibbs */ 6919954Sgibbsmesgin_extended: 69218762Sgibbs mvi MSGIN_EXT_LEN call inb_next 69318762Sgibbs mov A, MSGIN_EXT_LEN 69418762Sgibbsmesgin_extended_loop: 69519164Sgibbs mov DINDEX call inb_next 69618762Sgibbs dec A 69719164Sgibbs cmp DINDEX, MSGIN_EXT_LASTBYTE jne mesgin_extended_loop_test 69819164Sgibbs dec DINDEX /* dump by repeatedly filling the last byte */ 69919164Sgibbsmesgin_extended_loop_test: 70019164Sgibbs test A, 0xFF jnz mesgin_extended_loop 70118762Sgibbsmesgin_extended_intr: 70218762Sgibbs mvi INTSTAT,EXTENDED_MSG /* let driver know */ 70318762Sgibbs cmp RETURN_1,SEND_REJ je rej_mesgin 70418762Sgibbs cmp RETURN_1,SEND_MSG jne mesgin_done 70518762Sgibbs/* The kernel has setup a message to be sent */ 70613690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 7079954Sgibbs jmp mesgin_done 7085562Sgibbs 70913177Sgibbs/* 71013177Sgibbs * Is it a disconnect message? Set a flag in the SCB to remind us 71113177Sgibbs * and await the bus going free. 71213177Sgibbs */ 7139954Sgibbsmesgin_disconnect: 71419921Sgibbs and SIMODE1, 0xf7 /* ~ENBUSFREE */ 71513177Sgibbs or SCB_CONTROL,DISCONNECTED 71615328Sgibbs test FLAGS, PAGESCBS jz mesgin_done 71719164Sgibbs call add_scb_to_disc_list 71819164Sgibbs jmp mesgin_done 71919164Sgibbs 72015328Sgibbs/* 72119164Sgibbs * Save data pointers message: 72219164Sgibbs * Copying RAM values back to SCB, for Save Data Pointers message, but 72319164Sgibbs * only if we've actually been into a data phase to change them. This 72419164Sgibbs * protects against bogus data in scratch ram and the residual counts 72519164Sgibbs * since they are only initialized when we go into data_in or data_out. 72615328Sgibbs */ 72719164Sgibbsmesgin_sdptrs: 72819164Sgibbs test FLAGS, DPHASE jz mesgin_done 72919164Sgibbs mov SCB_SGCOUNT,SG_COUNT 7304568Sgibbs 73119164Sgibbs /* The SCB SGPTR becomes the next one we'll download */ 73219164Sgibbs mvi DINDEX, SCB_SGPTR 73319164Sgibbs mvi SG_NEXT0 call bcopy_4 73419164Sgibbs 73519164Sgibbs /* The SCB DATAPTR0 becomes the current SHADDR */ 73619164Sgibbs mvi DINDEX, SCB_DATAPTR0 73719164Sgibbs mvi SHADDR0 call bcopy_4 73819164Sgibbs 73913177Sgibbs/* 74019164Sgibbs * Use the residual number since STCNT is corrupted by any message transfer. 74113177Sgibbs */ 74219164Sgibbs mvi SCB_RESID_DCNT0 call bcopy_3 74319164Sgibbs 7449954Sgibbs jmp mesgin_done 7454568Sgibbs 74613177Sgibbs/* 74713177Sgibbs * Restore pointers message? Data pointers are recopied from the 74813177Sgibbs * SCB anytime we enter a data phase for the first time, so all 74913177Sgibbs * we need to do is clear the DPHASE flag and let the data phase 75013177Sgibbs * code do the rest. 75113177Sgibbs */ 7529954Sgibbsmesgin_rdptrs: 75315328Sgibbs and FLAGS,0xef /* 75413177Sgibbs * !DPHASE we'll reload them 75513177Sgibbs * the next time through 75613177Sgibbs */ 7579954Sgibbs jmp mesgin_done 7584568Sgibbs 75913177Sgibbs/* 76013177Sgibbs * Identify message? For a reconnecting target, this tells us the lun 76113177Sgibbs * that the reconnection is for - find the correct SCB and switch to it, 76213177Sgibbs * clearing the "disconnected" bit so we don't "find" it by accident later. 76313177Sgibbs */ 7649954Sgibbsmesgin_identify: 76513177Sgibbs test A,0x78 jnz rej_mesgin /*!DiscPriv|!LUNTAR|!Reserved*/ 76613177Sgibbs and A,0x07 /* lun in lower three bits */ 76719164Sgibbs or SAVED_TCL,A /* SAVED_TCL should be complete now */ 76813177Sgibbs call inb_last /* ACK */ 76913177Sgibbs 77013177Sgibbs/* 77113177Sgibbs * Here we "snoop" the bus looking for a SIMPLE QUEUE TAG message. 77215328Sgibbs * If we get one, we use the tag returned to switch to find the proper 77315328Sgibbs * SCB. With SCB paging, this requires using findSCB for both tagged 77415328Sgibbs * and non-tagged transactions since the SCB may exist in any slot. 77515328Sgibbs * If we're not using SCB paging, we can use the tag as the direct 77615328Sgibbs * index to the SCB. 77713177Sgibbs */ 77815328Sgibbs mvi ARG_1,SCB_LIST_NULL /* Default to no-tag */ 77913177Sgibbssnoop_tag_loop: 78019921Sgibbs test SSTAT0,SPIORDY jz snoop_tag_loop 78118762Sgibbs test SSTAT1,PHASEMIS jnz use_findSCB 78218762Sgibbs mvi A call inb_first 78318762Sgibbs cmp A,MSG_SIMPLE_Q_TAG jne use_findSCB 7846608Sgibbsget_tag: 78519218Sgibbs or FLAGS, TAGGED_SCB 78613177Sgibbs mvi ARG_1 call inb_next /* tag value */ 78713177Sgibbs/* 78813177Sgibbs * See if the tag is in range. The tag is < SCBCOUNT if we add 78913177Sgibbs * the complement of SCBCOUNT to the incomming tag and there is 79013177Sgibbs * no carry. 79113177Sgibbs */ 79213177Sgibbs mov A,COMP_SCBCOUNT 79313177Sgibbs add SINDEX,A,ARG_1 79419218Sgibbs jc send_abort_msg 79513177Sgibbs 79613177Sgibbs/* 79715328Sgibbs * Ensure that the SCB the tag points to is for an SCB transaction 79813177Sgibbs * to the reconnecting target. 79913177Sgibbs */ 80015328Sgibbs test FLAGS, PAGESCBS jz index_by_tag 80115328Sgibbsuse_findSCB: 80215328Sgibbs mov ALLZEROS call findSCB /* Have to search */ 80319218Sgibbs cmp SINDEX, SCB_LIST_NULL, je not_found 80415328Sgibbssetup_SCB: 80515328Sgibbs and SCB_CONTROL,0xfb /* clear disconnect bit in SCB */ 80615328Sgibbs or FLAGS,IDENTIFY_SEEN /* make note of IDENTIFY */ 80719164Sgibbs test SCB_CONTROL,TAG_ENB jnz mesgin_done /* Ack Tag */ 80815328Sgibbs jmp ITloop 80915328Sgibbsindex_by_tag: 81013177Sgibbs mov SCBPTR,ARG_1 81119218Sgibbs mov A, SAVED_TCL 81219218Sgibbs cmp SCB_TCL,A jne send_abort_msg 81319218Sgibbs test SCB_CONTROL,TAG_ENB jz send_abort_msg 81413177Sgibbs jmp setup_SCB 81515328Sgibbs 81619218Sgibbsnot_found: 81719218Sgibbs mvi INTSTAT, NO_MATCH 81819218Sgibbssend_abort_msg: 81919218Sgibbs test FLAGS, TAGGED_SCB jnz abort_tag_msg 82019218Sgibbs mvi MSG_ABORT call mk_mesg 82119218Sgibbs jmp mesgin_done 82219164Sgibbsabort_tag_msg: 82315328Sgibbs mvi MSG_ABORT_TAG call mk_mesg /* ABORT TAG message */ 82413177Sgibbs jmp mesgin_done 8256608Sgibbs 82613177Sgibbs/* 82713177Sgibbs * Message reject? Let the kernel driver handle this. If we have an 82813177Sgibbs * outstanding WDTR or SDTR negotiation, assume that it's a response from 82913177Sgibbs * the target selecting 8bit or asynchronous transfer, otherwise just ignore 83013177Sgibbs * it since we have no clue what it pertains to. 83113177Sgibbs */ 8329954Sgibbsmesgin_reject: 83313177Sgibbs mvi INTSTAT, REJECT_MSG 8349954Sgibbs jmp mesgin_done 8355562Sgibbs 83613177Sgibbs/* 83713177Sgibbs * [ ADD MORE MESSAGE HANDLING HERE ] 83813177Sgibbs */ 8394568Sgibbs 84013177Sgibbs/* 84113177Sgibbs * Locking the driver out, build a one-byte message passed in SINDEX 84213177Sgibbs * if there is no active message already. SINDEX is returned intact. 84313177Sgibbs */ 8444568Sgibbsmk_mesg: 84513177Sgibbs mvi SEQCTL,0x50 /* PAUSEDIS|FASTMODE */ 84613177Sgibbs test MSG_LEN,0xff jz mk_mesg1 /* Should always succeed */ 84713177Sgibbs 84813177Sgibbs /* 84913177Sgibbs * Hmmm. For some reason the mesg buffer is in use. 85013177Sgibbs * Tell the driver. It should look at SINDEX to find 85113177Sgibbs * out what we wanted to use the buffer for and resolve 85213177Sgibbs * the conflict. 85313177Sgibbs */ 85413177Sgibbs mvi SEQCTL,0x10 /* !PAUSEDIS|FASTMODE */ 85513690Sgibbs mvi INTSTAT,MSG_BUFFER_BUSY 8564568Sgibbs 8574568Sgibbsmk_mesg1: 85819623Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 85913177Sgibbs mvi MSG_LEN,1 /* length = 1 */ 86013177Sgibbs mov MSG0,SINDEX /* 1-byte message */ 86113177Sgibbs mvi SEQCTL,0x10 ret /* !PAUSEDIS|FASTMODE */ 8624568Sgibbs 86313177Sgibbs/* 86413177Sgibbs * Functions to read data in Automatic PIO mode. 86513177Sgibbs * 86613177Sgibbs * According to Adaptec's documentation, an ACK is not sent on input from 86713177Sgibbs * the target until SCSIDATL is read from. So we wait until SCSIDATL is 86813177Sgibbs * latched (the usual way), then read the data byte directly off the bus 86913177Sgibbs * using SCSIBUSL. When we have pulled the ATN line, or we just want to 87013177Sgibbs * acknowledge the byte, then we do a dummy read from SCISDATL. The SCSI 87113177Sgibbs * spec guarantees that the target will hold the data byte on the bus until 87213177Sgibbs * we send our ACK. 87313177Sgibbs * 87413177Sgibbs * The assumption here is that these are called in a particular sequence, 87513177Sgibbs * and that REQ is already set when inb_first is called. inb_{first,next} 87613177Sgibbs * use the same calling convention as inb. 87713177Sgibbs */ 87813177Sgibbs 87913177Sgibbsinb_next: 88019803Sgibbs call inb_last /* ACK */ 88113360Sgibbsinb_next_wait: 88219906Sgibbs test SSTAT0, SPIORDY jz inb_next_wait 88319803Sgibbs test SSTAT1,PHASEMIS jnz mesgin_phasemis 88419623Sgibbsinb_first: 8854568Sgibbs mov DINDEX,SINDEX 88613177Sgibbs mov DINDIR,SCSIBUSL ret /*read byte directly from bus*/ 88713177Sgibbsinb_last: 88819906Sgibbs mvi CLRSINT0, CLRSPIORDY 88913360Sgibbs mov NONE,SCSIDATL ret /*dummy read from latch to ACK*/ 8904568Sgibbs 89113177Sgibbsmesgin_phasemis: 89213177Sgibbs/* 89313177Sgibbs * We expected to receive another byte, but the target changed phase 89413177Sgibbs */ 89513177Sgibbs mvi INTSTAT, MSGIN_PHASEMIS 89613177Sgibbs jmp ITloop 8974568Sgibbs 89813177Sgibbs/* 89913177Sgibbs * DMA data transfer. HADDR and HCNT must be loaded first, and 90013177Sgibbs * SINDEX should contain the value to load DFCNTRL with - 0x3d for 90113177Sgibbs * host->scsi, or 0x39 for scsi->host. The SCSI channel is cleared 90213177Sgibbs * during initialization. 90313177Sgibbs */ 9044568Sgibbsdma: 9054568Sgibbs mov DFCNTRL,SINDEX 9064568Sgibbsdma1: 90713177Sgibbs test SSTAT0,DMADONE jnz dma3 90813177Sgibbs test SSTAT1,PHASEMIS jz dma1 /* ie. underrun */ 9094568Sgibbs 91013177Sgibbs/* 91113177Sgibbs * We will be "done" DMAing when the transfer count goes to zero, or 91213177Sgibbs * the target changes the phase (in light of this, it makes sense that 91313177Sgibbs * the DMA circuitry doesn't ACK when PHASEMIS is active). If we are 91413177Sgibbs * doing a SCSI->Host transfer, the data FIFO should be flushed auto- 91513177Sgibbs * magically on STCNT=0 or a phase change, so just wait for FIFO empty 91613177Sgibbs * status. 91713177Sgibbs */ 9184568Sgibbsdma3: 91913177Sgibbs test SINDEX,DIRECTION jnz dma5 9204568Sgibbsdma4: 92113177Sgibbs test DFSTATUS,FIFOEMP jz dma4 9224568Sgibbs 92313177Sgibbs/* 92413177Sgibbs * Now shut the DMA enables off and make sure that the DMA enables are 92513177Sgibbs * actually off first lest we get an ILLSADDR. 92613177Sgibbs */ 9274568Sgibbsdma5: 92813177Sgibbs /* disable DMA, but maintain WIDEODD */ 92913690Sgibbs and DFCNTRL,WIDEODD 9304568Sgibbsdma6: 93113177Sgibbs test DFCNTRL,0x38 jnz dma6 /* SCSIENACK|SDMAENACK|HDMAENACK */ 93218762Sgibbsreturn: 9334568Sgibbs ret 9344568Sgibbs 93513177Sgibbs/* 93613177Sgibbs * Common SCSI initialization for selection and reselection. Expects 93713177Sgibbs * the target SCSI ID to be in the upper four bits of SINDEX, and A's 93813177Sgibbs * contents are stomped on return. 93913177Sgibbs */ 9408104Sgibbsinitialize_scsiid: 94113177Sgibbs and SINDEX,0xf0 /* Get target ID */ 94219164Sgibbs mov SAVED_TCL, SINDEX /* Update the target portion of this */ 9435775Sgibbs and A,0x0f,SCSIID 9445775Sgibbs or SINDEX,A 9458104Sgibbs mov SCSIID,SINDEX ret 9465326Sgibbs 94713177Sgibbs/* 94813177Sgibbs * Assert that if we've been reselected, then we've seen an IDENTIFY 94913177Sgibbs * message. 95013177Sgibbs */ 9514568Sgibbsassert: 95213177Sgibbs test FLAGS,RESELECTED jz return /* reselected? */ 95313177Sgibbs test FLAGS,IDENTIFY_SEEN jnz return /* seen IDENTIFY? */ 9544568Sgibbs 95519164Sgibbs mvi INTSTAT,NO_IDENT ret /* no - tell the kernel */ 9564568Sgibbs 95713177Sgibbs/* 95819218Sgibbs * Locate a disconnected SCB either by SAVED_TCL (ARG_1 is SCB_LIST_NULL) 95919218Sgibbs * or by the SCBIDn ARG_1. The search begins at the SCB index passed in 96019218Sgibbs * via SINDEX. If the SCB cannot be found, SINDEX will be SCB_LIST_NULL, 96119218Sgibbs * otherwise, SCBPTR is set to the proper SCB. 96213177Sgibbs */ 9634568SgibbsfindSCB: 96415328Sgibbs mov SCBPTR,SINDEX /* switch to next SCB */ 96513177Sgibbs test SCB_CONTROL,DISCONNECTED jz findSCB1 /*should be disconnected*/ 96619218Sgibbs cmp ARG_1, SCB_LIST_NULL jne findBySCBID 96719218Sgibbs mov A, SAVED_TCL 96819218Sgibbs cmp SCB_TCL,A je foundSCB /* target ID/channel/lun match? */ 96919164SgibbsfindSCB1: 97019164Sgibbs inc SINDEX 97119164Sgibbs mov A,SCBCOUNT 97219164Sgibbs cmp SINDEX,A jne findSCB 97319164Sgibbs/* 97419164Sgibbs * We didn't find it. If we're paging, pull an SCB and DMA down the 97519164Sgibbs * one we want. If we aren't paging or the SCB we dma down has the 97619218Sgibbs * abort flag set, return not found. 97719164Sgibbs */ 97819218Sgibbs test FLAGS, PAGESCBS jz find_error 97919623Sgibbs mov ALLZEROS call get_free_or_disc_scb 98019218Sgibbs cmp ARG_1, SCB_LIST_NULL jne find_dma_scb 98119218Sgibbs mov SAVED_TCL call index_untagged_scb 98219218Sgibbs mov ARG_1, SINDIR /* SCBID of SCB to fetch */ 98319164Sgibbsfind_dma_scb: 98419164Sgibbs mvi DMAPARAMS, 0xd /* HDMAEN|DIRECTION|FIFORESET */ 98519218Sgibbs mov ARG_1 call dma_scb 98619164Sgibbs test SCB_CONTROL, ABORT_SCB jz return 98719218Sgibbsfind_error: 98819218Sgibbs mvi SINDEX, SCB_LIST_NULL ret 98919218SgibbsfindBySCBID: 99015328Sgibbs mov A, ARG_1 /* Tag passed in ARG_1 */ 99115328Sgibbs cmp SCB_TAG,A jne findSCB1 /* Found it? */ 99215328SgibbsfoundSCB: 99319218Sgibbs test SCB_CONTROL, ABORT_SCB jnz find_error 99419164Sgibbs test FLAGS,PAGESCBS jz return 99519164Sgibbsrem_scb_from_disc_list: 99615328Sgibbs/* Remove this SCB from the disconnection list */ 99715328Sgibbs cmp SCB_NEXT,SCB_LIST_NULL je unlink_prev 99815328Sgibbs mov SAVED_LINKPTR, SCB_PREV 99915328Sgibbs mov SCBPTR, SCB_NEXT 100015328Sgibbs mov SCB_PREV, SAVED_LINKPTR 100115328Sgibbs mov SCBPTR, SINDEX 100215328Sgibbsunlink_prev: 100315328Sgibbs cmp SCB_PREV,SCB_LIST_NULL je rHead/* At the head of the list */ 100415328Sgibbs mov SAVED_LINKPTR, SCB_NEXT 100515328Sgibbs mov SCBPTR, SCB_PREV 100615328Sgibbs mov SCB_NEXT, SAVED_LINKPTR 100719164Sgibbs mov SCBPTR, SINDEX ret 100815328SgibbsrHead: 100919164Sgibbs mov DISCONNECTED_SCBH,SCB_NEXT ret 10104568Sgibbs 101119164Sgibbsset_stcnt_from_hcnt: 101219164Sgibbs mov STCNT0, HCNT0 101319164Sgibbs mov STCNT1, HCNT1 101419164Sgibbs mov STCNT2, HCNT2 ret 10154568Sgibbs 101619164Sgibbsbcopy_7: 101719164Sgibbs mov DINDIR, SINDIR 101819164Sgibbs mov DINDIR, SINDIR 101919164Sgibbsbcopy_5: 102019164Sgibbs mov DINDIR, SINDIR 102119164Sgibbsbcopy_4: 102219164Sgibbs mov DINDIR, SINDIR 102319164Sgibbsbcopy_3: 102419164Sgibbs mov DINDIR, SINDIR 102519164Sgibbs mov DINDIR, SINDIR 102619164Sgibbs mov DINDIR, SINDIR ret 10274568Sgibbs 102819164Sgibbsdma_scb: 102919164Sgibbs /* 103019164Sgibbs * SCB index is in SINDEX. Determine the physical address in 103119164Sgibbs * the host where this SCB is located and load HADDR with it. 103219164Sgibbs */ 103319164Sgibbs shr DINDEX, SINDEX, 3 103419164Sgibbs shl A, SINDEX, 5 103519164Sgibbs add HADDR0, A, HSCB_ADDR0 103619164Sgibbs mov A, DINDEX 103719164Sgibbs adc HADDR1, A, HSCB_ADDR1 103819164Sgibbs clr A 103919164Sgibbs adc HADDR2, A, HSCB_ADDR2 104019164Sgibbs adc HADDR3, A, HSCB_ADDR3 104119164Sgibbs /* Setup Count */ 104219164Sgibbs mvi HCNT0, 28 104319164Sgibbs clr HCNT1 104419164Sgibbs clr HCNT2 104519164Sgibbs mov DFCNTRL, DMAPARAMS 104619164Sgibbs test DMAPARAMS, DIRECTION jnz dma_scb_fromhost 104719164Sgibbs /* Fill it with the SCB data */ 104819164Sgibbs call copy_scb_tofifo 104919164Sgibbs mvi DFCNTRL, 0xa /* HDMAEN | FIFOFLUSH */ 105019164Sgibbsdma_scb_fromhost: 105119164Sgibbs call dma_finish 105219164Sgibbs /* If we were putting the SCB, we are done */ 105319164Sgibbs test DMAPARAMS, DIRECTION jz return 105419164Sgibbs mvi SCBARRAY call dfdat_in_7 105519164Sgibbs call dfdat_in_7_continued 105619164Sgibbs call dfdat_in_7_continued 105719164Sgibbs jmp dfdat_in_7_continued 105819164Sgibbsdfdat_in_7: 105919164Sgibbs mov DINDEX,SINDEX 106019164Sgibbsdfdat_in_7_continued: 106119164Sgibbs mov DINDIR,DFDAT 106219164Sgibbs mov DINDIR,DFDAT 106319164Sgibbs mov DINDIR,DFDAT 106419164Sgibbs mov DINDIR,DFDAT 106519164Sgibbs mov DINDIR,DFDAT 106619164Sgibbs mov DINDIR,DFDAT 106719164Sgibbs mov DINDIR,DFDAT ret 106819164Sgibbs 106919164Sgibbscopy_scb_tofifo: 107019164Sgibbs mvi SCBARRAY call dfdat_out_7 107119164Sgibbs call dfdat_out_7 107219164Sgibbs call dfdat_out_7 107319164Sgibbsdfdat_out_7: 107419164Sgibbs mov DFDAT,SINDIR 107519164Sgibbs mov DFDAT,SINDIR 107619164Sgibbs mov DFDAT,SINDIR 107719164Sgibbs mov DFDAT,SINDIR 107819164Sgibbs mov DFDAT,SINDIR 107919164Sgibbs mov DFDAT,SINDIR 108019164Sgibbs mov DFDAT,SINDIR ret 108119164Sgibbs 108213177Sgibbs/* 108319164Sgibbs * Wait for DMA from host memory to data FIFO to complete, then disable 108419164Sgibbs * DMA and wait for it to acknowledge that it's off. 108513177Sgibbs */ 108619164Sgibbsdma_finish: 108719164Sgibbs test DFSTATUS,HDONE jz dma_finish 108819164Sgibbs /* Turn off DMA preserving WIDEODD */ 108919164Sgibbs and DFCNTRL,WIDEODD 109019164Sgibbsdma_finish2: 109119164Sgibbs test DFCNTRL,HDMAENACK jnz dma_finish2 109219164Sgibbs ret 10939928Sgibbs 109419164Sgibbsindex_untagged_scb: 109519218Sgibbs mov DINDEX, SINDEX 109619218Sgibbs shr DINDEX, 4 109719218Sgibbs and DINDEX, 0x03 /* Bottom two bits of tid */ 109819218Sgibbs add DINDEX, SCB_ACTIVE0 109919218Sgibbs shr A, SINDEX, 6 /* Target ID divided by 4 */ 110019421Sgibbs test SINDEX, SELBUSB jz index_untagged_scb2 110119421Sgibbs add A, 2 /* Add 2 positions */ 110219164Sgibbsindex_untagged_scb2: 110319164Sgibbs mov SCBPTR, A /* 110419164Sgibbs * Select the SCB with this 110519164Sgibbs * target's information. 110619164Sgibbs */ 110719218Sgibbs mov SINDEX, DINDEX ret 11089928Sgibbs 11094568Sgibbs 111019164Sgibbsget_free_or_disc_scb: 111119623Sgibbs cmp FREE_SCBH, SCB_LIST_NULL jne dequeue_free_scb 111219623Sgibbs cmp DISCONNECTED_SCBH, SCB_LIST_NULL jne dequeue_disc_scb 111319623Sgibbsreturn_error: 111419623Sgibbs mvi SINDEX, SCB_LIST_NULL ret 111519623Sgibbsdequeue_disc_scb: 111619164Sgibbs mov SCBPTR, DISCONNECTED_SCBH 111713177Sgibbs/* 111819164Sgibbs * If we have a residual, then we are in the middle of some I/O 111919164Sgibbs * and we have to send this SCB back up to the kernel so that the 112019164Sgibbs * saved data pointers and residual information isn't lost. 112119164Sgibbs */ 112219164Sgibbs test SCB_RESID_SGCNT,0xff jz unlink_disc_scb 112319164Sgibbs mvi DMAPARAMS, 0x9 /* HDMAEN | FIFORESET*/ 112419164Sgibbs mov SCB_TAG call dma_scb 112519164Sgibbsunlink_disc_scb: 112619623Sgibbs /* jmp instead of call since we want to return anyway */ 112719623Sgibbs mov SCBPTR jmp rem_scb_from_disc_list 112819164Sgibbsdequeue_free_scb: 112919164Sgibbs mov SCBPTR, FREE_SCBH 113019164Sgibbs mov FREE_SCBH, SCB_NEXT ret 11314568Sgibbs 113219164Sgibbsadd_scb_to_free_list: 113319164Sgibbs mov SCB_NEXT, FREE_SCBH 113419164Sgibbs mov FREE_SCBH, SCBPTR ret 11354568Sgibbs 113619164Sgibbsadd_scb_to_disc_list: 113713177Sgibbs/* 113819164Sgibbs * Link this SCB into the DISCONNECTED list. This list holds the 113919164Sgibbs * candidates for paging out an SCB if one is needed for a new command. 114019164Sgibbs * Modifying the disconnected list is a critical(pause dissabled) section. 114113177Sgibbs */ 114219164Sgibbs mvi SCB_PREV, SCB_LIST_NULL 114319164Sgibbs mov SCB_NEXT, DISCONNECTED_SCBH 114419164Sgibbs mov DISCONNECTED_SCBH, SCBPTR 114519164Sgibbs cmp SCB_NEXT,SCB_LIST_NULL je return 114619164Sgibbs mov SCBPTR,SCB_NEXT 114719164Sgibbs mov SCB_PREV,DISCONNECTED_SCBH 114819164Sgibbs mov SCBPTR,DISCONNECTED_SCBH ret 11494568Sgibbs 1150