aic7xxx.seq revision 21673
113177Sgibbs/*+M*********************************************************************** 213177Sgibbs *Adaptec 274x/284x/294x device driver for Linux and FreeBSD. 313177Sgibbs * 413177Sgibbs *Copyright (c) 1994 John Aycock 513177Sgibbs * The University of Calgary Department of Computer Science. 613177Sgibbs * All rights reserved. 713177Sgibbs * 815328Sgibbs *FreeBSD, Twin, Wide, 2 command per target support, tagged queuing, 915328Sgibbs *SCB paging and other optimizations: 1015328Sgibbs *Copyright (c) 1994, 1995, 1996 Justin Gibbs. All rights reserved. 1113177Sgibbs * 1213177Sgibbs *Redistribution and use in source and binary forms, with or without 1313177Sgibbs *modification, are permitted provided that the following conditions 1413177Sgibbs *are met: 1513177Sgibbs *1. Redistributions of source code must retain the above copyright 1613177Sgibbs * notice, this list of conditions, and the following disclaimer. 1713177Sgibbs *2. Redistributions in binary form must reproduce the above copyright 1813177Sgibbs * notice, this list of conditions and the following disclaimer in the 1913177Sgibbs * documentation and/or other materials provided with the distribution. 2013177Sgibbs *3. All advertising materials mentioning features or use of this software 2113177Sgibbs * must display the following acknowledgement: 2213177Sgibbs * This product includes software developed by the University of Calgary 2313177Sgibbs * Department of Computer Science and its contributors. 2413177Sgibbs *4. Neither the name of the University nor the names of its contributors 2513177Sgibbs * may be used to endorse or promote products derived from this software 2613177Sgibbs * without specific prior written permission. 2713177Sgibbs * 2813177Sgibbs *THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 2913177Sgibbs *ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 3013177Sgibbs *IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 3113177Sgibbs *ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 3213177Sgibbs *FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3313177Sgibbs *DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3413177Sgibbs *OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3513177Sgibbs *HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3613177Sgibbs *LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3713177Sgibbs *OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3813177Sgibbs *SUCH DAMAGE. 3913177Sgibbs * 4013177Sgibbs *-M************************************************************************/ 414568Sgibbs 4221673SjkhVERSION AIC7XXX_SEQ_VER "$FreeBSD: head/sys/dev/aic7xxx/aic7xxx.seq 21673 1997-01-14 07:20:47Z jkh $" 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: 8713177Sgibbs mvi SCSISEQ,ENRSELI /* Always allow reselection */ 8816198Sgibbs clr SCSIRATE /* 8916198Sgibbs * We don't know the target we will 9016198Sgibbs * connect to, so default to narrow 9116198Sgibbs * transfers to avoid parity problems. 9216198Sgibbs */ 9320117Sgibbs mvi LASTPHASE, P_BUSFREE 9420117Sgibbs and FLAGS,0x07 /* clear target specific flags */ 958104Sgibbspoll_for_work: 9613177Sgibbs /* 9713177Sgibbs * Are we a twin channel device? 9813177Sgibbs * For fairness, we check the other bus first, 9913177Sgibbs * since we just finished a transaction on the 10013177Sgibbs * current channel. 10113177Sgibbs */ 10213177Sgibbs test FLAGS,TWIN_BUS jz start2 10313177Sgibbs xor SBLKCTL,SELBUSB /* Toggle to the other bus */ 1048104Sgibbs test SSTAT0,SELDI jnz reselect 10513177Sgibbs xor SBLKCTL,SELBUSB /* Toggle to the original bus */ 1065326Sgibbsstart2: 1078104Sgibbs test SSTAT0,SELDI jnz reselect 10819164Sgibbs cmp WAITING_SCBH,SCB_LIST_NULL je test_queue 10919164Sgibbsstart_waiting: 11019164Sgibbs /* 11119164Sgibbs * Pull the first entry off of the waiting SCB list 11219164Sgibbs * We don't have to "test_busy" because only transactions that 11319164Sgibbs * have passed that test can be in the WAITING_SCB list. 11419164Sgibbs */ 11519164Sgibbs mov SCBPTR,WAITING_SCBH 11619164Sgibbs jmp start_scb2 11719164Sgibbstest_queue: 11819164Sgibbs /* Has the driver posted any work for us? */ 11914934Sgibbs mov A, QCNTMASK 12014934Sgibbs test QINCNT,A jz poll_for_work 1214568Sgibbs 12213690Sgibbs/* 12313690Sgibbs * We have at least one queued SCB now and we don't have any 12419164Sgibbs * SCBs in the list of SCBs awaiting selection. If we have 12519164Sgibbs * any SCBs availible for use, pull the tag from the QINFIFO 12619164Sgibbs * and get to work on it. 12713177Sgibbs */ 12819164Sgibbs test FLAGS, PAGESCBS jz dequeue_scb 12919623Sgibbs mov ALLZEROS call get_free_or_disc_scb 13019164Sgibbs cmp SINDEX, SCB_LIST_NULL je poll_for_work 13119164Sgibbsdequeue_scb: 13219164Sgibbs mov CUR_SCBID,QINFIFO 13319164Sgibbs test FLAGS, PAGESCBS jnz dma_queued_scb 13419164Sgibbs /* In the non-paging case, the SCBID == hardware SCB index */ 13519164Sgibbs mov SCBPTR, CUR_SCBID 13619164Sgibbsdma_queued_scb: 13719164Sgibbs/* 13819164Sgibbs * DMA the SCB from host ram into the current SCB location. 13919164Sgibbs */ 14019164Sgibbs mvi DMAPARAMS, 0xd /* HDMAEN|DIRECTION|FIFORESET */ 14119164Sgibbs mov CUR_SCBID call dma_scb 1424568Sgibbs 14313177Sgibbs/* 14413177Sgibbs * See if there is not already an active SCB for this target. This code 14513177Sgibbs * locks out on a per target basis instead of target/lun. Although this 14613177Sgibbs * is not ideal for devices that have multiple luns active at the same 14713177Sgibbs * time, it is faster than looping through all SCB's looking for active 14819921Sgibbs * commands. We also don't have enough spare SCB space for us to store the 14919164Sgibbs * SCBID of the currently busy transaction for each target/lun making it 15019164Sgibbs * impossible to link up the SCBs. 15113177Sgibbs */ 1525647Sgibbstest_busy: 15319164Sgibbs test SCB_CONTROL, TAG_ENB jnz start_scb 15419164Sgibbs mov SAVED_SCBPTR, SCBPTR 15519218Sgibbs mov SCB_TCL call index_untagged_scb 15619164Sgibbs mov ARG_1, SINDIR /* 15719164Sgibbs * ARG_1 should 15819164Sgibbs * now have the SCB ID of 15919164Sgibbs * any active, non-tagged, 16019164Sgibbs * command for this target. 16119164Sgibbs */ 16219164Sgibbs cmp ARG_1, SCB_LIST_NULL je make_busy 16319164Sgibbs test FLAGS, PAGESCBS jz simple_busy_link 16419164Sgibbs /* 16519164Sgibbs * Put this SCB back onto the free list. It 16619164Sgibbs * may be necessary to satisfy the search for 16719164Sgibbs * the active SCB. 16819164Sgibbs */ 16919218Sgibbs mov SCBPTR, SAVED_SCBPTR 17019164Sgibbs call add_scb_to_free_list 17119164Sgibbs /* Find the active SCB */ 17219164Sgibbs mov ALLZEROS call findSCB 17319218Sgibbs /* 17419218Sgibbs * If we couldn't find it, tell the kernel. This should 17519218Sgibbs * only happen if the parent SCB was aborted and this 17619218Sgibbs * one was already here at the time of the abort. 17719218Sgibbs */ 17819218Sgibbs cmp SINDEX, SCB_LIST_NULL jne paged_busy_link 17919218Sgibbs mvi INTSTAT, NO_MATCH_BUSY 18019218Sgibbspaged_busy_link: 18119164Sgibbs /* Link us in */ 18219164Sgibbs mov SCB_LINKED_NEXT, CUR_SCBID 18319164Sgibbs /* Put it back on the disconnected list */ 18419164Sgibbs call add_scb_to_disc_list 1858104Sgibbs jmp poll_for_work 18619164Sgibbssimple_busy_link: 18719164Sgibbs mov SCBPTR, ARG_1 18819164Sgibbs mov SCB_LINKED_NEXT, CUR_SCBID 18919164Sgibbs jmp poll_for_work 19019164Sgibbsmake_busy: 19119164Sgibbs mov DINDIR, CUR_SCBID 19219164Sgibbs mov SCBPTR, SAVED_SCBPTR 1934568Sgibbs 1945326Sgibbsstart_scb: 19519164Sgibbs /* 19619164Sgibbs * Place us on the waiting list in case our selection 19719164Sgibbs * doesn't win during bus arbitration. 19819164Sgibbs */ 19915328Sgibbs mov SCB_NEXT,WAITING_SCBH 20013177Sgibbs mov WAITING_SCBH, SCBPTR 20113177Sgibbsstart_scb2: 20213177Sgibbs and SINDEX,0xf7,SBLKCTL /* Clear the channel select bit */ 20313177Sgibbs and A,0x08,SCB_TCL /* Get new channel bit */ 20413177Sgibbs or SINDEX,A 20513177Sgibbs mov SBLKCTL,SINDEX /* select channel */ 20613177Sgibbs mov SCB_TCL call initialize_scsiid 2078104Sgibbs 20813177Sgibbs/* 20913177Sgibbs * Enable selection phase as an initiator, and do automatic ATN 21013177Sgibbs * after the selection. We do this now so that we can overlap the 21113177Sgibbs * rest of our work to set up this target with the arbitration and 21213177Sgibbs * selection bus phases. 21313177Sgibbs */ 2148104Sgibbsstart_selection: 21513177Sgibbs mvi SCSISEQ,0x58 /* ENSELO|ENAUTOATNO|ENRSELI */ 2164568Sgibbs 21713177Sgibbs/* 21813177Sgibbs * As soon as we get a successful selection, the target should go 21913177Sgibbs * into the message out phase since we have ATN asserted. Prepare 22013177Sgibbs * the message to send. 22113177Sgibbs * 22213177Sgibbs * Messages are stored in scratch RAM starting with a length byte 22313177Sgibbs * followed by the message itself. 22413177Sgibbs */ 2258567Sdg 22613177Sgibbsmk_identify: 22719164Sgibbs and MSG0,0x7,SCB_TCL /* lun */ 22813177Sgibbs and A,DISCENB,SCB_CONTROL /* mask off disconnect privledge */ 22913690Sgibbs or MSG0,A /* or in disconnect privledge */ 23018762Sgibbs or MSG0,MSG_IDENTIFYFLAG 23113690Sgibbs mvi MSG_LEN, 1 2324568Sgibbs 23313177Sgibbs/* 23415328Sgibbs * Send a tag message if TAG_ENB is set in the SCB control block. 23515328Sgibbs * Use SCB_TAG (the position in the kernel's SCB array) as the tag value. 23613177Sgibbs */ 2376608Sgibbsmk_tag: 23818762Sgibbs test SCB_CONTROL,TAG_ENB jz mk_message 23919164Sgibbs and MSG1,0x23,SCB_CONTROL 24019164Sgibbs mov MSG2,SCB_TAG 24119164Sgibbs add MSG_LEN,2 /* update message length */ 2426608Sgibbs 24318762Sgibbs/* 24418762Sgibbs * Interrupt the driver, and allow it to tweak the message buffer 24518762Sgibbs * if it asks. 24618762Sgibbs */ 24718762Sgibbsmk_message: 24818762Sgibbs test SCB_CONTROL,MK_MESSAGE jz wait_for_selection 2496608Sgibbs 25018762Sgibbs mvi INTSTAT,AWAITING_MSG 2516608Sgibbs 2529917Sgibbswait_for_selection: 25313177Sgibbs test SSTAT0,SELDO jnz select 25413177Sgibbs test SSTAT0,SELDI jz wait_for_selection 2554568Sgibbs 25613177Sgibbs/* 25713177Sgibbs * Reselection has been initiated by a target. Make a note that we've been 25819164Sgibbs * reselected, but haven't seen an IDENTIFY message from the target yet. 25913177Sgibbs */ 2604568Sgibbsreselect: 26113177Sgibbs clr MSG_LEN /* Don't have anything in the mesg buffer */ 2628104Sgibbs mov SELID call initialize_scsiid 26313177Sgibbs or FLAGS,RESELECTED 26413177Sgibbs jmp select2 2654568Sgibbs 26613177Sgibbs/* 26719164Sgibbs * After the selection, remove this SCB from the "waiting SCB" 26813177Sgibbs * list. This is achieved by simply moving our "next" pointer into 26913177Sgibbs * WAITING_SCBH. Our next pointer will be set to null the next time this 27013177Sgibbs * SCB is used, so don't bother with it now. 27113177Sgibbs */ 2728104Sgibbsselect: 27315328Sgibbs mov WAITING_SCBH,SCB_NEXT 2748104Sgibbsselect2: 27513177Sgibbs/* 27613177Sgibbs * Initialize SCSIRATE with the appropriate value for this target. 27719164Sgibbs * The SCSIRATE settings for each target are stored in an array 27819164Sgibbs * based at TARG_SCRATCH. 27913177Sgibbs */ 28019164Sgibbsndx_dtr: 28119164Sgibbs shr A,SCSIID,4 28219164Sgibbs test SBLKCTL,SELBUSB jz ndx_dtr_2 28319164Sgibbs or SAVED_TCL, SELBUSB /* Add the channel bit while we're here */ 28419164Sgibbs or A,0x08 /* Channel B entries add 8 */ 28519164Sgibbsndx_dtr_2: 28619164Sgibbs add SINDEX,TARG_SCRATCH,A 28713177Sgibbs mov SCSIRATE,SINDIR 28813177Sgibbs 28915843Sgibbs/* 29019164Sgibbs * Initialize Ultra mode setting and clear the SCSI channel. 29115843Sgibbs */ 29219164Sgibbsultra: 29319164Sgibbs and DINDEX,0xdf,SXFRCTL0 /* default to Ultra disabled */ 29419164Sgibbs /* 29519164Sgibbs * Set CLRCHN here before the target has entered a data transfer mode - 29619164Sgibbs * with synchronous SCSI, if you do it later, you blow away some 29719164Sgibbs * data in the SCSI FIFO that the target has already sent to you. 29819164Sgibbs */ 29919164Sgibbs or DINDEX, CLRCHN 30019164Sgibbs mvi SINDEX, ULTRA_ENB_B 30119164Sgibbs test SCSIID, 0x80 jnz ultra_2 /* Target ID > 7 */ 30219164Sgibbs test SBLKCTL, SELBUSB jnz ultra_2 /* Second channel device */ 30319164Sgibbs dec SINDEX 30419164Sgibbsultra_2: 30519164Sgibbs mov FUNCTION1,SCSIID 30619164Sgibbs mov A,FUNCTION1 30719164Sgibbs test SINDIR, A jz set_sxfrctl0 30819164Sgibbs or DINDEX, ULTRAEN 30919164Sgibbs 31015843Sgibbsset_sxfrctl0: 31119164Sgibbs mov SXFRCTL0,DINDEX 31215843Sgibbs 31316198Sgibbs mvi SCSISEQ,ENAUTOATNP /* 31416198Sgibbs * ATN on parity errors 31516198Sgibbs * for "in" phases 31613177Sgibbs */ 31713177Sgibbs mvi CLRSINT1,CLRBUSFREE 31813177Sgibbs mvi CLRSINT0,0x60 /* CLRSELDI|CLRSELDO */ 31919921Sgibbs or SIMODE1, ENBUSFREE /* 32019921Sgibbs * We aren't expecting a 32119921Sgibbs * bus free, so interrupt 32219921Sgibbs * the kernel driver if it 32319921Sgibbs * happens. 32419921Sgibbs */ 32513177Sgibbs/* 32613177Sgibbs * Main loop for information transfer phases. If BSY is false, then 32713177Sgibbs * we have a bus free condition, expected or not. Otherwise, wait 32813177Sgibbs * for the target to assert REQ before checking MSG, C/D and I/O 32913177Sgibbs * for the bus phase. 33013177Sgibbs * 33113177Sgibbs */ 3324568SgibbsITloop: 33313177Sgibbs test SSTAT1,BUSFREE jnz p_busfree 33413177Sgibbs test SSTAT1,REQINIT jz ITloop 3354568Sgibbs 33613177Sgibbs and A,PHASE_MASK,SCSISIGI 33713690Sgibbs mov LASTPHASE,A 33813690Sgibbs mov SCSISIGO,A 3394568Sgibbs 3404568Sgibbs cmp ALLZEROS,A je p_dataout 34113177Sgibbs cmp A,P_DATAIN je p_datain 34213177Sgibbs cmp A,P_COMMAND je p_command 34313177Sgibbs cmp A,P_MESGOUT je p_mesgout 34413177Sgibbs cmp A,P_STATUS je p_status 34513177Sgibbs cmp A,P_MESGIN je p_mesgin 3464568Sgibbs 34713177Sgibbs mvi INTSTAT,BAD_PHASE /* unknown phase - signal driver */ 34815843Sgibbs jmp ITloop /* Try reading the bus again. */ 3494568Sgibbs 3504568Sgibbsp_dataout: 35113177Sgibbs mvi DMAPARAMS,0x7d /* 35213177Sgibbs * WIDEODD|SCSIEN|SDMAEN|HDMAEN| 35313177Sgibbs * DIRECTION|FIFORESET 35413177Sgibbs */ 3559928Sgibbs jmp data_phase_init 3564568Sgibbs 35713177Sgibbs/* 35813177Sgibbs * If we re-enter the data phase after going through another phase, the 35913177Sgibbs * STCNT may have been cleared, so restore it from the residual field. 36013177Sgibbs */ 3619928Sgibbsdata_phase_reinit: 36219231Sgibbs mvi DINDEX, STCNT0 36319231Sgibbs mvi SCB_RESID_DCNT0 call bcopy_3 3649928Sgibbs jmp data_phase_loop 3654568Sgibbs 3669928Sgibbsp_datain: 36713177Sgibbs mvi DMAPARAMS,0x79 /* 36813177Sgibbs * WIDEODD|SCSIEN|SDMAEN|HDMAEN| 36913177Sgibbs * !DIRECTION|FIFORESET 37013177Sgibbs */ 3719928Sgibbsdata_phase_init: 37219164Sgibbs call assert /* 37319164Sgibbs * Ensure entering a data 37419164Sgibbs * phase is okay - seen identify, etc. 37519164Sgibbs */ 3765775Sgibbs 3779928Sgibbs test FLAGS, DPHASE jnz data_phase_reinit 3784568Sgibbs 37919164Sgibbs /* 38019164Sgibbs * Initialize the DMA address and counter from the SCB. 38119164Sgibbs * Also set SG_COUNT and SG_NEXT in memory since we cannot 38219164Sgibbs * modify the values in the SCB itself until we see a 38319164Sgibbs * save data pointers message. 38419164Sgibbs */ 38519164Sgibbs mvi DINDEX, HADDR0 38619164Sgibbs mvi SCB_DATAPTR call bcopy_7 38719164Sgibbs 38819164Sgibbs call set_stcnt_from_hcnt 38919164Sgibbs 39019164Sgibbs mov SG_COUNT,SCB_SGCOUNT 39119164Sgibbs 39219164Sgibbs mvi DINDEX, SG_NEXT 39319164Sgibbs mvi SCB_SGPTR call bcopy_4 39419164Sgibbs 39519164Sgibbs /* We have seen a data phase */ 39619164Sgibbs or FLAGS, DPHASE 39719164Sgibbs 3989928Sgibbsdata_phase_loop: 39916260Sgibbs/* Guard against overruns */ 40016260Sgibbs test SG_COUNT, 0xff jnz data_phase_inbounds 40116260Sgibbs/* 40216260Sgibbs * Turn on 'Bit Bucket' mode, set the transfer count to 40316260Sgibbs * 16meg and let the target run until it changes phase. 40416260Sgibbs * When the transfer completes, notify the host that we 40516260Sgibbs * had an overrun. 40616260Sgibbs */ 40716260Sgibbs or SXFRCTL1,BITBUCKET 40819921Sgibbs and DMAPARAMS, 0xf7 /* Turn off HDMAEN */ 40916260Sgibbs mvi STCNT0,0xff 41016260Sgibbs mvi STCNT1,0xff 41116260Sgibbs mvi STCNT2,0xff 41216260Sgibbs 41316260Sgibbsdata_phase_inbounds: 41419164Sgibbs/* If we are the last SG block, ensure wideodd is off. */ 4159928Sgibbs cmp SG_COUNT,0x01 jne data_phase_wideodd 41613177Sgibbs and DMAPARAMS, 0xbf /* Turn off WIDEODD */ 4179928Sgibbsdata_phase_wideodd: 4189928Sgibbs mov DMAPARAMS call dma 4194568Sgibbs 42016260Sgibbs/* Go tell the host about any overruns */ 42116260Sgibbs test SXFRCTL1,BITBUCKET jnz data_phase_overrun 42216260Sgibbs 42313177Sgibbs/* Exit if we had an underrun */ 42413177Sgibbs test SSTAT0,SDONE jz data_phase_finish /* underrun STCNT != 0 */ 4257532Sgibbs 42613177Sgibbs/* 42713177Sgibbs * Advance the scatter-gather pointers if needed 42813177Sgibbs */ 4299928Sgibbssg_advance: 43013177Sgibbs dec SG_COUNT /* one less segment to go */ 4314568Sgibbs 43213177Sgibbs test SG_COUNT, 0xff jz data_phase_finish /* Are we done? */ 4334568Sgibbs 43413177Sgibbs clr A /* add sizeof(struct scatter) */ 43513177Sgibbs add SG_NEXT0,SG_SIZEOF,SG_NEXT0 43613177Sgibbs adc SG_NEXT1,A,SG_NEXT1 4374568Sgibbs 43813177Sgibbs/* 43913177Sgibbs * Load a struct scatter and set up the data address and length. 44013177Sgibbs * If the working value of the SG count is nonzero, then 44113177Sgibbs * we need to load a new set of values. 44213177Sgibbs * 44315328Sgibbs * This, like all DMA's, assumes little-endian host data storage. 44413177Sgibbs */ 4459928Sgibbssg_load: 44613177Sgibbs clr HCNT2 44713177Sgibbs clr HCNT1 44813177Sgibbs mvi HCNT0,SG_SIZEOF 4494568Sgibbs 45019164Sgibbs mvi DINDEX, HADDR0 45119164Sgibbs mvi SG_NEXT0 call bcopy_4 4524568Sgibbs 45313690Sgibbs or DFCNTRL,0xd /* HDMAEN|DIRECTION|FIFORESET */ 4549928Sgibbs 45519164Sgibbs call dma_finish 4569928Sgibbs 45713177Sgibbs/* 45813177Sgibbs * Copy data from FIFO into SCB data pointer and data count. This assumes 45919164Sgibbs * that the SG segments are of the form: 46013177Sgibbs * 46113177Sgibbs * struct ahc_dma_seg { 46219164Sgibbs * u_int32_t addr; four bytes, little-endian order 46319164Sgibbs * u_int32_t len; four bytes, little endian order 46413177Sgibbs * }; 46513177Sgibbs */ 46619164Sgibbs mvi HADDR0 call dfdat_in_7 4679928Sgibbs 46813177Sgibbs/* Load STCNT as well. It is a mirror of HCNT */ 46919164Sgibbs call set_stcnt_from_hcnt 47019164Sgibbs test SSTAT1,PHASEMIS jz data_phase_loop 4714568Sgibbs 4729928Sgibbsdata_phase_finish: 47313177Sgibbs/* 47413177Sgibbs * After a DMA finishes, save the SG and STCNT residuals back into the SCB 47513177Sgibbs * We use STCNT instead of HCNT, since it's a reflection of how many bytes 47613177Sgibbs * were transferred on the SCSI (as opposed to the host) bus. 47713177Sgibbs */ 47813690Sgibbs mov SCB_RESID_DCNT0,STCNT0 47913690Sgibbs mov SCB_RESID_DCNT1,STCNT1 48013690Sgibbs mov SCB_RESID_DCNT2,STCNT2 48113177Sgibbs mov SCB_RESID_SGCNT, SG_COUNT 4824568Sgibbs jmp ITloop 4834568Sgibbs 48416260Sgibbsdata_phase_overrun: 48513177Sgibbs/* 48616260Sgibbs * Turn off BITBUCKET mode and notify the host 48716260Sgibbs */ 48816260Sgibbs and SXFRCTL1,0x7f /* ~BITBUCKET */ 48916260Sgibbs mvi INTSTAT,DATA_OVERRUN 49016260Sgibbs jmp ITloop 49116260Sgibbs 49216260Sgibbs/* 49315328Sgibbs * Command phase. Set up the DMA registers and let 'er rip. 49413177Sgibbs */ 4954568Sgibbsp_command: 4964568Sgibbs call assert 4974568Sgibbs 49813177Sgibbs/* 49915328Sgibbs * Load HADDR and HCNT. 50013177Sgibbs */ 50119164Sgibbs mvi DINDEX, HADDR0 50219164Sgibbs mvi SCB_CMDPTR call bcopy_5 50313690Sgibbs clr HCNT1 50413690Sgibbs clr HCNT2 5054568Sgibbs 50619164Sgibbs call set_stcnt_from_hcnt 5074568Sgibbs 5084568Sgibbs mvi 0x3d call dma # SCSIEN|SDMAEN|HDMAEN| 5094568Sgibbs # DIRECTION|FIFORESET 5104568Sgibbs jmp ITloop 5114568Sgibbs 51213177Sgibbs/* 51313177Sgibbs * Status phase. Wait for the data byte to appear, then read it 51413177Sgibbs * and store it into the SCB. 51513177Sgibbs */ 5164568Sgibbsp_status: 51719803Sgibbs call assert 51819803Sgibbs 51913177Sgibbs mvi SCB_TARGET_STATUS call inb_first 5209954Sgibbs jmp mesgin_done 5214568Sgibbs 52213177Sgibbs/* 52315328Sgibbs * Message out phase. If there is not an active message, but the target 52413177Sgibbs * took us into this phase anyway, build a no-op message and send it. 52513177Sgibbs */ 5264568Sgibbsp_mesgout: 52713177Sgibbs test MSG_LEN, 0xff jnz p_mesgout_start 52818762Sgibbs mvi MSG_NOOP call mk_mesg /* build NOP message */ 52913177Sgibbsp_mesgout_start: 53013177Sgibbs/* 53113177Sgibbs * Set up automatic PIO transfer from MSG0. Bit 3 in 53213177Sgibbs * SXFRCTL0 (SPIOEN) is already on. 53313177Sgibbs */ 53413177Sgibbs mvi SINDEX,MSG0 5354568Sgibbs mov DINDEX,MSG_LEN 5364568Sgibbs 53713177Sgibbs/* 53813177Sgibbs * When target asks for a byte, drop ATN if it's the last one in 53913177Sgibbs * the message. Otherwise, keep going until the message is exhausted. 54013177Sgibbs * 54113177Sgibbs * Keep an eye out for a phase change, in case the target issues 54213177Sgibbs * a MESSAGE REJECT. 54313177Sgibbs */ 54413177Sgibbsp_mesgout_loop: 54519906Sgibbs test SSTAT0,SPIORDY jz p_mesgout_loop 54619906Sgibbs test SSTAT1,PHASEMIS jnz p_mesgout_done 54713177Sgibbs/* 54813177Sgibbs * If the next bus phase after ATN drops is a message out, it means 54913177Sgibbs * that the target is requesting that the last message(s) be resent. 55013177Sgibbs */ 55119921Sgibbsp_mesgout_testretry: 55220117Sgibbs test DINDEX,0xff jnz p_mesgout_dropatn 55319906Sgibbs or SCSISIGO,ATNO /* turn on ATN for the retry */ 55419906Sgibbs jmp p_mesgout_start 55520117Sgibbsp_mesgout_dropatn: 55620117Sgibbs cmp DINDEX,1 jne p_mesgout_outb /* last byte? */ 55720117Sgibbs mvi CLRSINT1,CLRATNO /* drop ATN */ 55819906Sgibbsp_mesgout_outb: 55919906Sgibbs dec DINDEX 56019906Sgibbs mvi CLRSINT0, CLRSPIORDY 56119906Sgibbs mov SCSIDATL,SINDIR 56219906Sgibbs jmp p_mesgout_loop 5634568Sgibbs 56419906Sgibbsp_mesgout_done: 56515328Sgibbs mvi CLRSINT1,CLRATNO /* Be sure to turn ATNO off */ 56613177Sgibbs clr MSG_LEN /* no active msg */ 5674568Sgibbs jmp ITloop 5684568Sgibbs 56913177Sgibbs/* 57013177Sgibbs * Message in phase. Bytes are read using Automatic PIO mode. 57113177Sgibbs */ 5724568Sgibbsp_mesgin: 57313177Sgibbs mvi A call inb_first /* read the 1st message byte */ 57413177Sgibbs mov REJBYTE,A /* save it for the driver */ 5754568Sgibbs 57618762Sgibbs test A,MSG_IDENTIFYFLAG jnz mesgin_identify 57713177Sgibbs cmp A,MSG_DISCONNECT je mesgin_disconnect 57818762Sgibbs cmp A,MSG_SAVEDATAPOINTER je mesgin_sdptrs 57913177Sgibbs cmp ALLZEROS,A je mesgin_complete 58018762Sgibbs cmp A,MSG_RESTOREPOINTERS je mesgin_rdptrs 58113177Sgibbs cmp A,MSG_EXTENDED je mesgin_extended 58218762Sgibbs cmp A,MSG_MESSAGE_REJECT je mesgin_reject 5834568Sgibbs 5849954Sgibbsrej_mesgin: 58513177Sgibbs/* 58619164Sgibbs * We have no idea what this message in is, so we issue a message reject 58719164Sgibbs * and hope for the best. In any case, rejection should be a rare 58819164Sgibbs * occurrence - signal the driver when it happens. 58913177Sgibbs */ 59013177Sgibbs mvi INTSTAT,SEND_REJECT /* let driver know */ 5919954Sgibbs 59218762Sgibbs mvi MSG_MESSAGE_REJECT call mk_mesg 5939954Sgibbs 5949954Sgibbsmesgin_done: 59513177Sgibbs call inb_last /*ack & turn auto PIO back on*/ 5969954Sgibbs jmp ITloop 5979954Sgibbs 5989954Sgibbs 5999954Sgibbsmesgin_complete: 60013177Sgibbs/* 60119164Sgibbs * We got a "command complete" message, so put the SCB_TAG into the QOUTFIFO, 60219164Sgibbs * and trigger a completion interrupt. Before doing so, check to see if there 60319164Sgibbs * is a residual or the status byte is something other than NO_ERROR (0). In 60419164Sgibbs * either of these conditions, we upload the SCB back to the host so it can 60519164Sgibbs * process this information. In the case of a non zero status byte, we 60619164Sgibbs * additionally interrupt the kernel driver synchronously, allowing it to 60719164Sgibbs * decide if sense should be retrieved. If the kernel driver wishes to request 60819164Sgibbs * sense, it will fill the kernel SCB with a request sense command and set 60919164Sgibbs * RETURN_1 to SEND_SENSE. If RETURN_1 is set to SEND_SENSE we redownload 61019164Sgibbs * the SCB, and process it as the next command by adding it to the waiting list. 61119164Sgibbs * If the kernel driver does not wish to request sense, it need only clear 61219164Sgibbs * RETURN_1, and the command is allowed to complete normally. We don't bother 61319164Sgibbs * to post to the QOUTFIFO in the error cases since it would require extra 61419164Sgibbs * work in the kernel driver to ensure that the entry was removed before the 61519164Sgibbs * command complete code tried processing it. 61613177Sgibbs */ 61719164Sgibbs 61813177Sgibbs/* 61919921Sgibbs * We expect to go to bus free after this message. 62019921Sgibbs */ 62119921Sgibbs and SIMODE1, 0xf7 /* ~ENBUSFREE */ 62219921Sgibbs/* 62319164Sgibbs * First check for residuals 62413177Sgibbs */ 62519164Sgibbs test SCB_RESID_SGCNT,0xff jnz upload_scb 62619164Sgibbs test SCB_TARGET_STATUS,0xff jz status_ok /* Good Status? */ 62719164Sgibbsupload_scb: 62819164Sgibbs mvi DMAPARAMS, 0x9 /* HDMAEN | FIFORESET*/ 62919164Sgibbs mov SCB_TAG call dma_scb 6307532Sgibbscheck_status: 63119164Sgibbs test SCB_TARGET_STATUS,0xff jz status_ok /* Just a residual? */ 63213177Sgibbs mvi INTSTAT,BAD_STATUS /* let driver know */ 63313177Sgibbs cmp RETURN_1, SEND_SENSE jne status_ok 63419164Sgibbs /* This SCB becomes the next to execute as it will retrieve sense */ 63519164Sgibbs mov SCB_LINKED_NEXT, SCB_TAG 63619164Sgibbs jmp dma_next_scb 6375326Sgibbs 6384568Sgibbsstatus_ok: 63913177Sgibbs/* First, mark this target as free. */ 64019921Sgibbs test SCB_CONTROL,TAG_ENB jnz complete /* 64113177Sgibbs * Tagged commands 64213177Sgibbs * don't busy the 64313177Sgibbs * target. 64413177Sgibbs */ 64519164Sgibbs mov SAVED_SCBPTR, SCBPTR 64619164Sgibbs mov SAVED_LINKPTR, SCB_LINKED_NEXT 64719218Sgibbs mov SCB_TCL call index_untagged_scb 64819164Sgibbs mov DINDIR, SAVED_LINKPTR 64919164Sgibbs mov SCBPTR, SAVED_SCBPTR 6505326Sgibbs 6515326Sgibbscomplete: 65219623Sgibbs test FLAGS, PAGESCBS jz complete_post 65319623Sgibbs mov A, QFULLCNT 65419623Sgibbscomplete_poll: 65519623Sgibbs cmp QOUTQCNT, A je complete_poll 65619803Sgibbs mvi SEQCTL,0x50 /* PAUSEDIS|FASTMODE */ 65719623Sgibbs inc QOUTQCNT 65819623Sgibbscomplete_post: 65919164Sgibbs /* Post the SCB and issue an interrupt */ 66015328Sgibbs mov QOUTFIFO,SCB_TAG 66119803Sgibbs mvi SEQCTL,0x10 /* FASTMODE */ 6627532Sgibbs mvi INTSTAT,CMDCMPLT 66319164Sgibbs 66419164Sgibbsdma_next_scb: 66519921Sgibbs cmp SCB_LINKED_NEXT, SCB_LIST_NULL je add_to_free_list 66619164Sgibbs test FLAGS, PAGESCBS jnz dma_next_scb2 66719164Sgibbs /* Only DMA on top of ourselves if we are the SCB to download */ 66819164Sgibbs mov A, SCB_LINKED_NEXT 66919164Sgibbs cmp SCB_TAG, A je dma_next_scb2 67019164Sgibbs mov SCBPTR, A 67119164Sgibbs jmp add_to_waiting_list 67219164Sgibbsdma_next_scb2: 67319164Sgibbs mvi DMAPARAMS, 0xd /* HDMAEN|DIRECTION|FIFORESET */ 67419218Sgibbs mov SCB_LINKED_NEXT call dma_scb 67519164Sgibbsadd_to_waiting_list: 67619164Sgibbs mov SCB_NEXT,WAITING_SCBH 67719164Sgibbs mov WAITING_SCBH, SCBPTR 6789954Sgibbs jmp mesgin_done 67919921Sgibbsadd_to_free_list: 68019921Sgibbs call add_scb_to_free_list 68119921Sgibbs jmp mesgin_done 6824568Sgibbs 68313177Sgibbs/* 68418762Sgibbs * Is it an extended message? Copy the message to our message buffer and 68518762Sgibbs * notify the host. The host will tell us whether to reject this message, 68618762Sgibbs * respond to it with the message that the host placed in our message buffer, 68718762Sgibbs * or simply to do nothing. 68813177Sgibbs */ 6899954Sgibbsmesgin_extended: 69018762Sgibbs mvi MSGIN_EXT_LEN call inb_next 69118762Sgibbs mov A, MSGIN_EXT_LEN 69218762Sgibbsmesgin_extended_loop: 69319164Sgibbs mov DINDEX call inb_next 69418762Sgibbs dec A 69519164Sgibbs cmp DINDEX, MSGIN_EXT_LASTBYTE jne mesgin_extended_loop_test 69619164Sgibbs dec DINDEX /* dump by repeatedly filling the last byte */ 69719164Sgibbsmesgin_extended_loop_test: 69819164Sgibbs test A, 0xFF jnz mesgin_extended_loop 69918762Sgibbsmesgin_extended_intr: 70018762Sgibbs mvi INTSTAT,EXTENDED_MSG /* let driver know */ 70118762Sgibbs cmp RETURN_1,SEND_REJ je rej_mesgin 70218762Sgibbs cmp RETURN_1,SEND_MSG jne mesgin_done 70318762Sgibbs/* The kernel has setup a message to be sent */ 70413690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 7059954Sgibbs jmp mesgin_done 7065562Sgibbs 70713177Sgibbs/* 70813177Sgibbs * Is it a disconnect message? Set a flag in the SCB to remind us 70913177Sgibbs * and await the bus going free. 71013177Sgibbs */ 7119954Sgibbsmesgin_disconnect: 71219921Sgibbs and SIMODE1, 0xf7 /* ~ENBUSFREE */ 71313177Sgibbs or SCB_CONTROL,DISCONNECTED 71415328Sgibbs test FLAGS, PAGESCBS jz mesgin_done 71519164Sgibbs call add_scb_to_disc_list 71619164Sgibbs jmp mesgin_done 71719164Sgibbs 71815328Sgibbs/* 71919164Sgibbs * Save data pointers message: 72019164Sgibbs * Copying RAM values back to SCB, for Save Data Pointers message, but 72119164Sgibbs * only if we've actually been into a data phase to change them. This 72219164Sgibbs * protects against bogus data in scratch ram and the residual counts 72319164Sgibbs * since they are only initialized when we go into data_in or data_out. 72415328Sgibbs */ 72519164Sgibbsmesgin_sdptrs: 72619164Sgibbs test FLAGS, DPHASE jz mesgin_done 72719164Sgibbs mov SCB_SGCOUNT,SG_COUNT 7284568Sgibbs 72919164Sgibbs /* The SCB SGPTR becomes the next one we'll download */ 73019164Sgibbs mvi DINDEX, SCB_SGPTR 73119164Sgibbs mvi SG_NEXT0 call bcopy_4 73219164Sgibbs 73319164Sgibbs /* The SCB DATAPTR0 becomes the current SHADDR */ 73419164Sgibbs mvi DINDEX, SCB_DATAPTR0 73519164Sgibbs mvi SHADDR0 call bcopy_4 73619164Sgibbs 73713177Sgibbs/* 73819164Sgibbs * Use the residual number since STCNT is corrupted by any message transfer. 73913177Sgibbs */ 74019164Sgibbs mvi SCB_RESID_DCNT0 call bcopy_3 74119164Sgibbs 7429954Sgibbs jmp mesgin_done 7434568Sgibbs 74413177Sgibbs/* 74513177Sgibbs * Restore pointers message? Data pointers are recopied from the 74613177Sgibbs * SCB anytime we enter a data phase for the first time, so all 74713177Sgibbs * we need to do is clear the DPHASE flag and let the data phase 74813177Sgibbs * code do the rest. 74913177Sgibbs */ 7509954Sgibbsmesgin_rdptrs: 75115328Sgibbs and FLAGS,0xef /* 75213177Sgibbs * !DPHASE we'll reload them 75313177Sgibbs * the next time through 75413177Sgibbs */ 7559954Sgibbs jmp mesgin_done 7564568Sgibbs 75713177Sgibbs/* 75813177Sgibbs * Identify message? For a reconnecting target, this tells us the lun 75913177Sgibbs * that the reconnection is for - find the correct SCB and switch to it, 76013177Sgibbs * clearing the "disconnected" bit so we don't "find" it by accident later. 76113177Sgibbs */ 7629954Sgibbsmesgin_identify: 76313177Sgibbs test A,0x78 jnz rej_mesgin /*!DiscPriv|!LUNTAR|!Reserved*/ 76413177Sgibbs and A,0x07 /* lun in lower three bits */ 76519164Sgibbs or SAVED_TCL,A /* SAVED_TCL should be complete now */ 76613177Sgibbs call inb_last /* ACK */ 76713177Sgibbs 76813177Sgibbs/* 76913177Sgibbs * Here we "snoop" the bus looking for a SIMPLE QUEUE TAG message. 77015328Sgibbs * If we get one, we use the tag returned to switch to find the proper 77115328Sgibbs * SCB. With SCB paging, this requires using findSCB for both tagged 77215328Sgibbs * and non-tagged transactions since the SCB may exist in any slot. 77315328Sgibbs * If we're not using SCB paging, we can use the tag as the direct 77415328Sgibbs * index to the SCB. 77513177Sgibbs */ 77615328Sgibbs mvi ARG_1,SCB_LIST_NULL /* Default to no-tag */ 77713177Sgibbssnoop_tag_loop: 77820117Sgibbs test SSTAT1,REQINIT jz snoop_tag_loop 77918762Sgibbs test SSTAT1,PHASEMIS jnz 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: 85619623Sgibbs or SCSISIGO,ATNO /* 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: 87819803Sgibbs call inb_last /* ACK */ 87913360Sgibbsinb_next_wait: 88019906Sgibbs test SSTAT0, SPIORDY jz inb_next_wait 88119803Sgibbs test SSTAT1,PHASEMIS jnz mesgin_phasemis 88219623Sgibbsinb_first: 8834568Sgibbs mov DINDEX,SINDEX 88413177Sgibbs mov DINDIR,SCSIBUSL ret /*read byte directly from bus*/ 88513177Sgibbsinb_last: 88619906Sgibbs mvi CLRSINT0, CLRSPIORDY 88713360Sgibbs mov NONE,SCSIDATL ret /*dummy read from latch to ACK*/ 8884568Sgibbs 88913177Sgibbsmesgin_phasemis: 89013177Sgibbs/* 89113177Sgibbs * We expected to receive another byte, but the target changed phase 89213177Sgibbs */ 89313177Sgibbs mvi INTSTAT, MSGIN_PHASEMIS 89413177Sgibbs jmp ITloop 8954568Sgibbs 89613177Sgibbs/* 89713177Sgibbs * DMA data transfer. HADDR and HCNT must be loaded first, and 89813177Sgibbs * SINDEX should contain the value to load DFCNTRL with - 0x3d for 89913177Sgibbs * host->scsi, or 0x39 for scsi->host. The SCSI channel is cleared 90013177Sgibbs * during initialization. 90113177Sgibbs */ 9024568Sgibbsdma: 9034568Sgibbs mov DFCNTRL,SINDEX 9044568Sgibbsdma1: 90513177Sgibbs test SSTAT0,DMADONE jnz dma3 90613177Sgibbs test SSTAT1,PHASEMIS jz dma1 /* ie. underrun */ 9074568Sgibbs 90813177Sgibbs/* 90913177Sgibbs * We will be "done" DMAing when the transfer count goes to zero, or 91013177Sgibbs * the target changes the phase (in light of this, it makes sense that 91113177Sgibbs * the DMA circuitry doesn't ACK when PHASEMIS is active). If we are 91213177Sgibbs * doing a SCSI->Host transfer, the data FIFO should be flushed auto- 91313177Sgibbs * magically on STCNT=0 or a phase change, so just wait for FIFO empty 91413177Sgibbs * status. 91513177Sgibbs */ 9164568Sgibbsdma3: 91713177Sgibbs test SINDEX,DIRECTION jnz dma5 9184568Sgibbsdma4: 91913177Sgibbs test DFSTATUS,FIFOEMP jz dma4 9204568Sgibbs 92113177Sgibbs/* 92213177Sgibbs * Now shut the DMA enables off and make sure that the DMA enables are 92313177Sgibbs * actually off first lest we get an ILLSADDR. 92413177Sgibbs */ 9254568Sgibbsdma5: 92613177Sgibbs /* disable DMA, but maintain WIDEODD */ 92713690Sgibbs and DFCNTRL,WIDEODD 9284568Sgibbsdma6: 92913177Sgibbs test DFCNTRL,0x38 jnz dma6 /* SCSIENACK|SDMAENACK|HDMAENACK */ 93018762Sgibbsreturn: 9314568Sgibbs ret 9324568Sgibbs 93313177Sgibbs/* 93413177Sgibbs * Common SCSI initialization for selection and reselection. Expects 93513177Sgibbs * the target SCSI ID to be in the upper four bits of SINDEX, and A's 93613177Sgibbs * contents are stomped on return. 93713177Sgibbs */ 9388104Sgibbsinitialize_scsiid: 93913177Sgibbs and SINDEX,0xf0 /* Get target ID */ 94019164Sgibbs mov SAVED_TCL, SINDEX /* Update the target portion of this */ 9415775Sgibbs and A,0x0f,SCSIID 9425775Sgibbs or SINDEX,A 9438104Sgibbs mov SCSIID,SINDEX ret 9445326Sgibbs 94513177Sgibbs/* 94613177Sgibbs * Assert that if we've been reselected, then we've seen an IDENTIFY 94713177Sgibbs * message. 94813177Sgibbs */ 9494568Sgibbsassert: 95013177Sgibbs test FLAGS,RESELECTED jz return /* reselected? */ 95113177Sgibbs test FLAGS,IDENTIFY_SEEN jnz return /* seen IDENTIFY? */ 9524568Sgibbs 95319164Sgibbs mvi INTSTAT,NO_IDENT ret /* no - tell the kernel */ 9544568Sgibbs 95513177Sgibbs/* 95619218Sgibbs * Locate a disconnected SCB either by SAVED_TCL (ARG_1 is SCB_LIST_NULL) 95719218Sgibbs * or by the SCBIDn ARG_1. The search begins at the SCB index passed in 95819218Sgibbs * via SINDEX. If the SCB cannot be found, SINDEX will be SCB_LIST_NULL, 95919218Sgibbs * otherwise, SCBPTR is set to the proper SCB. 96013177Sgibbs */ 9614568SgibbsfindSCB: 96215328Sgibbs mov SCBPTR,SINDEX /* switch to next SCB */ 96313177Sgibbs test SCB_CONTROL,DISCONNECTED jz findSCB1 /*should be disconnected*/ 96419218Sgibbs cmp ARG_1, SCB_LIST_NULL jne findBySCBID 96519218Sgibbs mov A, SAVED_TCL 96619218Sgibbs cmp SCB_TCL,A je foundSCB /* target ID/channel/lun match? */ 96719164SgibbsfindSCB1: 96819164Sgibbs inc SINDEX 96919164Sgibbs mov A,SCBCOUNT 97019164Sgibbs cmp SINDEX,A jne findSCB 97119164Sgibbs/* 97219164Sgibbs * We didn't find it. If we're paging, pull an SCB and DMA down the 97319164Sgibbs * one we want. If we aren't paging or the SCB we dma down has the 97419218Sgibbs * abort flag set, return not found. 97519164Sgibbs */ 97619218Sgibbs test FLAGS, PAGESCBS jz find_error 97719623Sgibbs mov ALLZEROS call get_free_or_disc_scb 97819218Sgibbs cmp ARG_1, SCB_LIST_NULL jne find_dma_scb 97919218Sgibbs mov SAVED_TCL call index_untagged_scb 98019218Sgibbs mov ARG_1, SINDIR /* SCBID of SCB to fetch */ 98119164Sgibbsfind_dma_scb: 98219164Sgibbs mvi DMAPARAMS, 0xd /* HDMAEN|DIRECTION|FIFORESET */ 98319218Sgibbs mov ARG_1 call dma_scb 98419164Sgibbs test SCB_CONTROL, ABORT_SCB jz return 98519218Sgibbsfind_error: 98619218Sgibbs mvi SINDEX, SCB_LIST_NULL ret 98719218SgibbsfindBySCBID: 98815328Sgibbs mov A, ARG_1 /* Tag passed in ARG_1 */ 98915328Sgibbs cmp SCB_TAG,A jne findSCB1 /* Found it? */ 99015328SgibbsfoundSCB: 99119218Sgibbs test SCB_CONTROL, ABORT_SCB jnz find_error 99219164Sgibbs test FLAGS,PAGESCBS jz return 99319164Sgibbsrem_scb_from_disc_list: 99415328Sgibbs/* Remove this SCB from the disconnection list */ 99515328Sgibbs cmp SCB_NEXT,SCB_LIST_NULL je unlink_prev 99615328Sgibbs mov SAVED_LINKPTR, SCB_PREV 99715328Sgibbs mov SCBPTR, SCB_NEXT 99815328Sgibbs mov SCB_PREV, SAVED_LINKPTR 99915328Sgibbs mov SCBPTR, SINDEX 100015328Sgibbsunlink_prev: 100115328Sgibbs cmp SCB_PREV,SCB_LIST_NULL je rHead/* At the head of the list */ 100215328Sgibbs mov SAVED_LINKPTR, SCB_NEXT 100315328Sgibbs mov SCBPTR, SCB_PREV 100415328Sgibbs mov SCB_NEXT, SAVED_LINKPTR 100519164Sgibbs mov SCBPTR, SINDEX ret 100615328SgibbsrHead: 100719164Sgibbs mov DISCONNECTED_SCBH,SCB_NEXT ret 10084568Sgibbs 100919164Sgibbsset_stcnt_from_hcnt: 101019164Sgibbs mov STCNT0, HCNT0 101119164Sgibbs mov STCNT1, HCNT1 101219164Sgibbs mov STCNT2, HCNT2 ret 10134568Sgibbs 101419164Sgibbsbcopy_7: 101519164Sgibbs mov DINDIR, SINDIR 101619164Sgibbs mov DINDIR, SINDIR 101719164Sgibbsbcopy_5: 101819164Sgibbs mov DINDIR, SINDIR 101919164Sgibbsbcopy_4: 102019164Sgibbs mov DINDIR, SINDIR 102119164Sgibbsbcopy_3: 102219164Sgibbs mov DINDIR, SINDIR 102319164Sgibbs mov DINDIR, SINDIR 102419164Sgibbs mov DINDIR, SINDIR ret 10254568Sgibbs 102619164Sgibbsdma_scb: 102719164Sgibbs /* 102819164Sgibbs * SCB index is in SINDEX. Determine the physical address in 102919164Sgibbs * the host where this SCB is located and load HADDR with it. 103019164Sgibbs */ 103119164Sgibbs shr DINDEX, SINDEX, 3 103219164Sgibbs shl A, SINDEX, 5 103319164Sgibbs add HADDR0, A, HSCB_ADDR0 103419164Sgibbs mov A, DINDEX 103519164Sgibbs adc HADDR1, A, HSCB_ADDR1 103619164Sgibbs clr A 103719164Sgibbs adc HADDR2, A, HSCB_ADDR2 103819164Sgibbs adc HADDR3, A, HSCB_ADDR3 103919164Sgibbs /* Setup Count */ 104019164Sgibbs mvi HCNT0, 28 104119164Sgibbs clr HCNT1 104219164Sgibbs clr HCNT2 104319164Sgibbs mov DFCNTRL, DMAPARAMS 104419164Sgibbs test DMAPARAMS, DIRECTION jnz dma_scb_fromhost 104519164Sgibbs /* Fill it with the SCB data */ 104619164Sgibbs call copy_scb_tofifo 104719164Sgibbs mvi DFCNTRL, 0xa /* HDMAEN | FIFOFLUSH */ 104819164Sgibbsdma_scb_fromhost: 104919164Sgibbs call dma_finish 105019164Sgibbs /* If we were putting the SCB, we are done */ 105119164Sgibbs test DMAPARAMS, DIRECTION jz return 105219164Sgibbs mvi SCBARRAY call dfdat_in_7 105319164Sgibbs call dfdat_in_7_continued 105419164Sgibbs call dfdat_in_7_continued 105519164Sgibbs jmp dfdat_in_7_continued 105619164Sgibbsdfdat_in_7: 105719164Sgibbs mov DINDEX,SINDEX 105819164Sgibbsdfdat_in_7_continued: 105919164Sgibbs mov DINDIR,DFDAT 106019164Sgibbs mov DINDIR,DFDAT 106119164Sgibbs mov DINDIR,DFDAT 106219164Sgibbs mov DINDIR,DFDAT 106319164Sgibbs mov DINDIR,DFDAT 106419164Sgibbs mov DINDIR,DFDAT 106519164Sgibbs mov DINDIR,DFDAT ret 106619164Sgibbs 106719164Sgibbscopy_scb_tofifo: 106819164Sgibbs mvi SCBARRAY call dfdat_out_7 106919164Sgibbs call dfdat_out_7 107019164Sgibbs call dfdat_out_7 107119164Sgibbsdfdat_out_7: 107219164Sgibbs mov DFDAT,SINDIR 107319164Sgibbs mov DFDAT,SINDIR 107419164Sgibbs mov DFDAT,SINDIR 107519164Sgibbs mov DFDAT,SINDIR 107619164Sgibbs mov DFDAT,SINDIR 107719164Sgibbs mov DFDAT,SINDIR 107819164Sgibbs mov DFDAT,SINDIR ret 107919164Sgibbs 108013177Sgibbs/* 108119164Sgibbs * Wait for DMA from host memory to data FIFO to complete, then disable 108219164Sgibbs * DMA and wait for it to acknowledge that it's off. 108313177Sgibbs */ 108419164Sgibbsdma_finish: 108519164Sgibbs test DFSTATUS,HDONE jz dma_finish 108619164Sgibbs /* Turn off DMA preserving WIDEODD */ 108719164Sgibbs and DFCNTRL,WIDEODD 108819164Sgibbsdma_finish2: 108919164Sgibbs test DFCNTRL,HDMAENACK jnz dma_finish2 109019164Sgibbs ret 10919928Sgibbs 109219164Sgibbsindex_untagged_scb: 109319218Sgibbs mov DINDEX, SINDEX 109419218Sgibbs shr DINDEX, 4 109519218Sgibbs and DINDEX, 0x03 /* Bottom two bits of tid */ 109619218Sgibbs add DINDEX, SCB_ACTIVE0 109719218Sgibbs shr A, SINDEX, 6 /* Target ID divided by 4 */ 109819421Sgibbs test SINDEX, SELBUSB jz index_untagged_scb2 109919421Sgibbs add A, 2 /* Add 2 positions */ 110019164Sgibbsindex_untagged_scb2: 110119164Sgibbs mov SCBPTR, A /* 110219164Sgibbs * Select the SCB with this 110319164Sgibbs * target's information. 110419164Sgibbs */ 110519218Sgibbs mov SINDEX, DINDEX ret 11069928Sgibbs 11074568Sgibbs 110819164Sgibbsget_free_or_disc_scb: 110919623Sgibbs cmp FREE_SCBH, SCB_LIST_NULL jne dequeue_free_scb 111019623Sgibbs cmp DISCONNECTED_SCBH, SCB_LIST_NULL jne dequeue_disc_scb 111119623Sgibbsreturn_error: 111219623Sgibbs mvi SINDEX, SCB_LIST_NULL ret 111319623Sgibbsdequeue_disc_scb: 111419164Sgibbs mov SCBPTR, DISCONNECTED_SCBH 111513177Sgibbs/* 111619164Sgibbs * If we have a residual, then we are in the middle of some I/O 111719164Sgibbs * and we have to send this SCB back up to the kernel so that the 111819164Sgibbs * saved data pointers and residual information isn't lost. 111919164Sgibbs */ 112019164Sgibbs test SCB_RESID_SGCNT,0xff jz unlink_disc_scb 112119164Sgibbs mvi DMAPARAMS, 0x9 /* HDMAEN | FIFORESET*/ 112219164Sgibbs mov SCB_TAG call dma_scb 112319164Sgibbsunlink_disc_scb: 112419623Sgibbs /* jmp instead of call since we want to return anyway */ 112519623Sgibbs mov SCBPTR jmp rem_scb_from_disc_list 112619164Sgibbsdequeue_free_scb: 112719164Sgibbs mov SCBPTR, FREE_SCBH 112819164Sgibbs mov FREE_SCBH, SCB_NEXT ret 11294568Sgibbs 113019164Sgibbsadd_scb_to_free_list: 113119164Sgibbs mov SCB_NEXT, FREE_SCBH 113219164Sgibbs mov FREE_SCBH, SCBPTR ret 11334568Sgibbs 113419164Sgibbsadd_scb_to_disc_list: 113513177Sgibbs/* 113619164Sgibbs * Link this SCB into the DISCONNECTED list. This list holds the 113719164Sgibbs * candidates for paging out an SCB if one is needed for a new command. 113819164Sgibbs * Modifying the disconnected list is a critical(pause dissabled) section. 113913177Sgibbs */ 114019164Sgibbs mvi SCB_PREV, SCB_LIST_NULL 114119164Sgibbs mov SCB_NEXT, DISCONNECTED_SCBH 114219164Sgibbs mov DISCONNECTED_SCBH, SCBPTR 114319164Sgibbs cmp SCB_NEXT,SCB_LIST_NULL je return 114419164Sgibbs mov SCBPTR,SCB_NEXT 114519164Sgibbs mov SCB_PREV,DISCONNECTED_SCBH 114619164Sgibbs mov SCBPTR,DISCONNECTED_SCBH ret 11474568Sgibbs 1148