aic7xxx.seq revision 19218
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 4219218SgibbsVERSION AIC7XXX_SEQ_VER "$Id: aic7xxx.seq,v 1.44 1996/10/25 06:34:56 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 */ 8514449Sgibbs/* 8614449Sgibbs * We jump to start after every bus free. 8714449Sgibbs */ 8813177Sgibbsstart: 8919164Sgibbs and FLAGS,0x07 /* clear target specific flags */ 9013177Sgibbs mvi SCSISEQ,ENRSELI /* Always allow reselection */ 9116198Sgibbs clr SCSIRATE /* 9216198Sgibbs * We don't know the target we will 9316198Sgibbs * connect to, so default to narrow 9416198Sgibbs * transfers to avoid parity problems. 9516198Sgibbs */ 968104Sgibbspoll_for_work: 9713177Sgibbs /* 9813177Sgibbs * Are we a twin channel device? 9913177Sgibbs * For fairness, we check the other bus first, 10013177Sgibbs * since we just finished a transaction on the 10113177Sgibbs * current channel. 10213177Sgibbs */ 10313177Sgibbs test FLAGS,TWIN_BUS jz start2 10413177Sgibbs xor SBLKCTL,SELBUSB /* Toggle to the other bus */ 1058104Sgibbs test SSTAT0,SELDI jnz reselect 10613177Sgibbs xor SBLKCTL,SELBUSB /* Toggle to the original bus */ 1075326Sgibbsstart2: 1088104Sgibbs test SSTAT0,SELDI jnz reselect 10919164Sgibbs cmp WAITING_SCBH,SCB_LIST_NULL je test_queue 11019164Sgibbsstart_waiting: 11119164Sgibbs /* 11219164Sgibbs * Pull the first entry off of the waiting SCB list 11319164Sgibbs * We don't have to "test_busy" because only transactions that 11419164Sgibbs * have passed that test can be in the WAITING_SCB list. 11519164Sgibbs */ 11619164Sgibbs mov SCBPTR,WAITING_SCBH 11719164Sgibbs jmp start_scb2 11819164Sgibbstest_queue: 11919164Sgibbs /* Has the driver posted any work for us? */ 12014934Sgibbs mov A, QCNTMASK 12114934Sgibbs test QINCNT,A jz poll_for_work 1224568Sgibbs 12313690Sgibbs/* 12413690Sgibbs * We have at least one queued SCB now and we don't have any 12519164Sgibbs * SCBs in the list of SCBs awaiting selection. If we have 12619164Sgibbs * any SCBs availible for use, pull the tag from the QINFIFO 12719164Sgibbs * and get to work on it. 12813177Sgibbs */ 12919164Sgibbs test FLAGS, PAGESCBS jz dequeue_scb 13019164Sgibbs call get_free_or_disc_scb 13119164Sgibbs cmp SINDEX, SCB_LIST_NULL je poll_for_work 13219164Sgibbsdequeue_scb: 13319164Sgibbs mov CUR_SCBID,QINFIFO 13419164Sgibbs test FLAGS, PAGESCBS jnz dma_queued_scb 13519164Sgibbs /* In the non-paging case, the SCBID == hardware SCB index */ 13619164Sgibbs mov SCBPTR, CUR_SCBID 13719164Sgibbsdma_queued_scb: 13819164Sgibbs/* 13919164Sgibbs * DMA the SCB from host ram into the current SCB location. 14019164Sgibbs */ 14119164Sgibbs mvi DMAPARAMS, 0xd /* HDMAEN|DIRECTION|FIFORESET */ 14219164Sgibbs mov CUR_SCBID call dma_scb 1434568Sgibbs 14413177Sgibbs/* 14513177Sgibbs * See if there is not already an active SCB for this target. This code 14613177Sgibbs * locks out on a per target basis instead of target/lun. Although this 14713177Sgibbs * is not ideal for devices that have multiple luns active at the same 14813177Sgibbs * time, it is faster than looping through all SCB's looking for active 14919164Sgibbs * commands. We also don't have enough spare SCB space for to store the 15019164Sgibbs * SCBID of the currently busy transaction for each target/lun making it 15119164Sgibbs * impossible to link up the SCBs. 15213177Sgibbs */ 1535647Sgibbstest_busy: 15419164Sgibbs test SCB_CONTROL, TAG_ENB jnz start_scb 15519164Sgibbs mov SAVED_SCBPTR, SCBPTR 15619218Sgibbs mov SCB_TCL call index_untagged_scb 15719164Sgibbs mov ARG_1, SINDIR /* 15819164Sgibbs * ARG_1 should 15919164Sgibbs * now have the SCB ID of 16019164Sgibbs * any active, non-tagged, 16119164Sgibbs * command for this target. 16219164Sgibbs */ 16319164Sgibbs cmp ARG_1, SCB_LIST_NULL je make_busy 16419164Sgibbs test FLAGS, PAGESCBS jz simple_busy_link 16519164Sgibbs /* 16619164Sgibbs * Put this SCB back onto the free list. It 16719164Sgibbs * may be necessary to satisfy the search for 16819164Sgibbs * the active SCB. 16919164Sgibbs */ 17019218Sgibbs mov SCBPTR, SAVED_SCBPTR 17119164Sgibbs call add_scb_to_free_list 17219164Sgibbs /* Find the active SCB */ 17319164Sgibbs mov ALLZEROS call findSCB 17419218Sgibbs /* 17519218Sgibbs * If we couldn't find it, tell the kernel. This should 17619218Sgibbs * only happen if the parent SCB was aborted and this 17719218Sgibbs * one was already here at the time of the abort. 17819218Sgibbs */ 17919218Sgibbs cmp SINDEX, SCB_LIST_NULL jne paged_busy_link 18019218Sgibbs mvi INTSTAT, NO_MATCH_BUSY 18119218Sgibbspaged_busy_link: 18219164Sgibbs /* Link us in */ 18319164Sgibbs mov SCB_LINKED_NEXT, CUR_SCBID 18419164Sgibbs /* Put it back on the disconnected list */ 18519164Sgibbs call add_scb_to_disc_list 1868104Sgibbs jmp poll_for_work 18719164Sgibbssimple_busy_link: 18819164Sgibbs mov SCBPTR, ARG_1 18919164Sgibbs mov SCB_LINKED_NEXT, CUR_SCBID 19019164Sgibbs jmp poll_for_work 19119164Sgibbsmake_busy: 19219164Sgibbs mov DINDIR, CUR_SCBID 19319164Sgibbs mov SCBPTR, SAVED_SCBPTR 1944568Sgibbs 1955326Sgibbsstart_scb: 19619164Sgibbs /* 19719164Sgibbs * Place us on the waiting list in case our selection 19819164Sgibbs * doesn't win during bus arbitration. 19919164Sgibbs */ 20015328Sgibbs mov SCB_NEXT,WAITING_SCBH 20113177Sgibbs mov WAITING_SCBH, SCBPTR 20213177Sgibbsstart_scb2: 20313177Sgibbs and SINDEX,0xf7,SBLKCTL /* Clear the channel select bit */ 20413177Sgibbs and A,0x08,SCB_TCL /* Get new channel bit */ 20513177Sgibbs or SINDEX,A 20613177Sgibbs mov SBLKCTL,SINDEX /* select channel */ 20713177Sgibbs mov SCB_TCL call initialize_scsiid 2088104Sgibbs 20913177Sgibbs/* 21013177Sgibbs * Enable selection phase as an initiator, and do automatic ATN 21113177Sgibbs * after the selection. We do this now so that we can overlap the 21213177Sgibbs * rest of our work to set up this target with the arbitration and 21313177Sgibbs * selection bus phases. 21413177Sgibbs */ 2158104Sgibbsstart_selection: 21613177Sgibbs mvi SCSISEQ,0x58 /* ENSELO|ENAUTOATNO|ENRSELI */ 2174568Sgibbs 21813177Sgibbs/* 21913177Sgibbs * As soon as we get a successful selection, the target should go 22013177Sgibbs * into the message out phase since we have ATN asserted. Prepare 22113177Sgibbs * the message to send. 22213177Sgibbs * 22313177Sgibbs * Messages are stored in scratch RAM starting with a length byte 22413177Sgibbs * followed by the message itself. 22513177Sgibbs */ 2268567Sdg 22713177Sgibbsmk_identify: 22819164Sgibbs and MSG0,0x7,SCB_TCL /* lun */ 22913177Sgibbs and A,DISCENB,SCB_CONTROL /* mask off disconnect privledge */ 23013690Sgibbs or MSG0,A /* or in disconnect privledge */ 23118762Sgibbs or MSG0,MSG_IDENTIFYFLAG 23213690Sgibbs mvi MSG_LEN, 1 2334568Sgibbs 23413177Sgibbs/* 23515328Sgibbs * Send a tag message if TAG_ENB is set in the SCB control block. 23615328Sgibbs * Use SCB_TAG (the position in the kernel's SCB array) as the tag value. 23713177Sgibbs */ 2386608Sgibbsmk_tag: 23918762Sgibbs test SCB_CONTROL,TAG_ENB jz mk_message 24019164Sgibbs and MSG1,0x23,SCB_CONTROL 24119164Sgibbs mov MSG2,SCB_TAG 24219164Sgibbs add MSG_LEN,2 /* update message length */ 2436608Sgibbs 24418762Sgibbs/* 24518762Sgibbs * Interrupt the driver, and allow it to tweak the message buffer 24618762Sgibbs * if it asks. 24718762Sgibbs */ 24818762Sgibbsmk_message: 24918762Sgibbs test SCB_CONTROL,MK_MESSAGE jz wait_for_selection 2506608Sgibbs 25118762Sgibbs mvi INTSTAT,AWAITING_MSG 2526608Sgibbs 2539917Sgibbswait_for_selection: 25413177Sgibbs test SSTAT0,SELDO jnz select 25513177Sgibbs test SSTAT0,SELDI jz wait_for_selection 2564568Sgibbs 25713177Sgibbs/* 25813177Sgibbs * Reselection has been initiated by a target. Make a note that we've been 25919164Sgibbs * reselected, but haven't seen an IDENTIFY message from the target yet. 26013177Sgibbs */ 2614568Sgibbsreselect: 26213177Sgibbs clr MSG_LEN /* Don't have anything in the mesg buffer */ 2638104Sgibbs mov SELID call initialize_scsiid 26413177Sgibbs or FLAGS,RESELECTED 26513177Sgibbs jmp select2 2664568Sgibbs 26713177Sgibbs/* 26819164Sgibbs * After the selection, remove this SCB from the "waiting SCB" 26913177Sgibbs * list. This is achieved by simply moving our "next" pointer into 27013177Sgibbs * WAITING_SCBH. Our next pointer will be set to null the next time this 27113177Sgibbs * SCB is used, so don't bother with it now. 27213177Sgibbs */ 2738104Sgibbsselect: 27415328Sgibbs mov WAITING_SCBH,SCB_NEXT 2758104Sgibbsselect2: 27613177Sgibbs/* 27713177Sgibbs * Initialize SCSIRATE with the appropriate value for this target. 27819164Sgibbs * The SCSIRATE settings for each target are stored in an array 27919164Sgibbs * based at TARG_SCRATCH. 28013177Sgibbs */ 28119164Sgibbsndx_dtr: 28219164Sgibbs shr A,SCSIID,4 28319164Sgibbs test SBLKCTL,SELBUSB jz ndx_dtr_2 28419164Sgibbs or SAVED_TCL, SELBUSB /* Add the channel bit while we're here */ 28519164Sgibbs or A,0x08 /* Channel B entries add 8 */ 28619164Sgibbsndx_dtr_2: 28719164Sgibbs add SINDEX,TARG_SCRATCH,A 28813177Sgibbs mov SCSIRATE,SINDIR 28913177Sgibbs 29015843Sgibbs/* 29119164Sgibbs * Initialize Ultra mode setting and clear the SCSI channel. 29215843Sgibbs */ 29319164Sgibbsultra: 29419164Sgibbs and DINDEX,0xdf,SXFRCTL0 /* default to Ultra disabled */ 29519164Sgibbs /* 29619164Sgibbs * Set CLRCHN here before the target has entered a data transfer mode - 29719164Sgibbs * with synchronous SCSI, if you do it later, you blow away some 29819164Sgibbs * data in the SCSI FIFO that the target has already sent to you. 29919164Sgibbs */ 30019164Sgibbs or DINDEX, CLRCHN 30119164Sgibbs mvi SINDEX, ULTRA_ENB_B 30219164Sgibbs test SCSIID, 0x80 jnz ultra_2 /* Target ID > 7 */ 30319164Sgibbs test SBLKCTL, SELBUSB jnz ultra_2 /* Second channel device */ 30419164Sgibbs dec SINDEX 30519164Sgibbsultra_2: 30619164Sgibbs mov FUNCTION1,SCSIID 30719164Sgibbs mov A,FUNCTION1 30819164Sgibbs test SINDIR, A jz set_sxfrctl0 30919164Sgibbs or DINDEX, ULTRAEN 31019164Sgibbs 31115843Sgibbsset_sxfrctl0: 31219164Sgibbs mov SXFRCTL0,DINDEX 31315843Sgibbs 31416198Sgibbs mvi SCSISEQ,ENAUTOATNP /* 31516198Sgibbs * ATN on parity errors 31616198Sgibbs * for "in" phases 31713177Sgibbs */ 31813177Sgibbs mvi CLRSINT1,CLRBUSFREE 31913177Sgibbs mvi CLRSINT0,0x60 /* CLRSELDI|CLRSELDO */ 32013177Sgibbs/* 32113177Sgibbs * Main loop for information transfer phases. If BSY is false, then 32213177Sgibbs * we have a bus free condition, expected or not. Otherwise, wait 32313177Sgibbs * for the target to assert REQ before checking MSG, C/D and I/O 32413177Sgibbs * for the bus phase. 32513177Sgibbs * 32613177Sgibbs */ 3274568SgibbsITloop: 32813177Sgibbs test SSTAT1,BUSFREE jnz p_busfree 32913177Sgibbs test SSTAT1,REQINIT jz ITloop 3304568Sgibbs 33113177Sgibbs and A,PHASE_MASK,SCSISIGI 33213690Sgibbs mov LASTPHASE,A 33313690Sgibbs mov SCSISIGO,A 3344568Sgibbs 3354568Sgibbs cmp ALLZEROS,A je p_dataout 33613177Sgibbs cmp A,P_DATAIN je p_datain 33713177Sgibbs cmp A,P_COMMAND je p_command 33813177Sgibbs cmp A,P_MESGOUT je p_mesgout 33913177Sgibbs cmp A,P_STATUS je p_status 34013177Sgibbs cmp A,P_MESGIN je p_mesgin 3414568Sgibbs 34213177Sgibbs mvi INTSTAT,BAD_PHASE /* unknown phase - signal driver */ 34315843Sgibbs jmp ITloop /* Try reading the bus again. */ 3444568Sgibbs 3454568Sgibbsp_dataout: 34613177Sgibbs mvi DMAPARAMS,0x7d /* 34713177Sgibbs * WIDEODD|SCSIEN|SDMAEN|HDMAEN| 34813177Sgibbs * DIRECTION|FIFORESET 34913177Sgibbs */ 3509928Sgibbs jmp data_phase_init 3514568Sgibbs 35213177Sgibbs/* 35313177Sgibbs * If we re-enter the data phase after going through another phase, the 35413177Sgibbs * STCNT may have been cleared, so restore it from the residual field. 35513177Sgibbs */ 3569928Sgibbsdata_phase_reinit: 35719218Sgibbs mov DINDEX, STCNT0 35819218Sgibbs mov SCB_RESID_DCNT0 call bcopy_3 3599928Sgibbs jmp data_phase_loop 3604568Sgibbs 3619928Sgibbsp_datain: 36213177Sgibbs mvi DMAPARAMS,0x79 /* 36313177Sgibbs * WIDEODD|SCSIEN|SDMAEN|HDMAEN| 36413177Sgibbs * !DIRECTION|FIFORESET 36513177Sgibbs */ 3669928Sgibbsdata_phase_init: 36719164Sgibbs call assert /* 36819164Sgibbs * Ensure entering a data 36919164Sgibbs * phase is okay - seen identify, etc. 37019164Sgibbs */ 3715775Sgibbs 3729928Sgibbs test FLAGS, DPHASE jnz data_phase_reinit 3734568Sgibbs 37419164Sgibbs /* 37519164Sgibbs * Initialize the DMA address and counter from the SCB. 37619164Sgibbs * Also set SG_COUNT and SG_NEXT in memory since we cannot 37719164Sgibbs * modify the values in the SCB itself until we see a 37819164Sgibbs * save data pointers message. 37919164Sgibbs */ 38019164Sgibbs mvi DINDEX, HADDR0 38119164Sgibbs mvi SCB_DATAPTR call bcopy_7 38219164Sgibbs 38319164Sgibbs call set_stcnt_from_hcnt 38419164Sgibbs 38519164Sgibbs mov SG_COUNT,SCB_SGCOUNT 38619164Sgibbs 38719164Sgibbs mvi DINDEX, SG_NEXT 38819164Sgibbs mvi SCB_SGPTR call bcopy_4 38919164Sgibbs 39019164Sgibbs /* We have seen a data phase */ 39119164Sgibbs or FLAGS, DPHASE 39219164Sgibbs 3939928Sgibbsdata_phase_loop: 39416260Sgibbs/* Guard against overruns */ 39516260Sgibbs test SG_COUNT, 0xff jnz data_phase_inbounds 39616260Sgibbs/* 39716260Sgibbs * Turn on 'Bit Bucket' mode, set the transfer count to 39816260Sgibbs * 16meg and let the target run until it changes phase. 39916260Sgibbs * When the transfer completes, notify the host that we 40016260Sgibbs * had an overrun. 40116260Sgibbs */ 40216260Sgibbs or SXFRCTL1,BITBUCKET 40316260Sgibbs mvi STCNT0,0xff 40416260Sgibbs mvi STCNT1,0xff 40516260Sgibbs mvi STCNT2,0xff 40616260Sgibbs 40716260Sgibbsdata_phase_inbounds: 40819164Sgibbs/* If we are the last SG block, ensure wideodd is off. */ 4099928Sgibbs cmp SG_COUNT,0x01 jne data_phase_wideodd 41013177Sgibbs and DMAPARAMS, 0xbf /* Turn off WIDEODD */ 4119928Sgibbsdata_phase_wideodd: 4129928Sgibbs mov DMAPARAMS call dma 4134568Sgibbs 41416260Sgibbs/* Go tell the host about any overruns */ 41516260Sgibbs test SXFRCTL1,BITBUCKET jnz data_phase_overrun 41616260Sgibbs 41713177Sgibbs/* Exit if we had an underrun */ 41813177Sgibbs test SSTAT0,SDONE jz data_phase_finish /* underrun STCNT != 0 */ 4197532Sgibbs 42013177Sgibbs/* 42113177Sgibbs * Advance the scatter-gather pointers if needed 42213177Sgibbs */ 4239928Sgibbssg_advance: 42413177Sgibbs dec SG_COUNT /* one less segment to go */ 4254568Sgibbs 42613177Sgibbs test SG_COUNT, 0xff jz data_phase_finish /* Are we done? */ 4274568Sgibbs 42813177Sgibbs clr A /* add sizeof(struct scatter) */ 42913177Sgibbs add SG_NEXT0,SG_SIZEOF,SG_NEXT0 43013177Sgibbs adc SG_NEXT1,A,SG_NEXT1 4314568Sgibbs 43213177Sgibbs/* 43313177Sgibbs * Load a struct scatter and set up the data address and length. 43413177Sgibbs * If the working value of the SG count is nonzero, then 43513177Sgibbs * we need to load a new set of values. 43613177Sgibbs * 43715328Sgibbs * This, like all DMA's, assumes little-endian host data storage. 43813177Sgibbs */ 4399928Sgibbssg_load: 44013177Sgibbs clr HCNT2 44113177Sgibbs clr HCNT1 44213177Sgibbs mvi HCNT0,SG_SIZEOF 4434568Sgibbs 44419164Sgibbs mvi DINDEX, HADDR0 44519164Sgibbs mvi SG_NEXT0 call bcopy_4 4464568Sgibbs 44713690Sgibbs or DFCNTRL,0xd /* HDMAEN|DIRECTION|FIFORESET */ 4489928Sgibbs 44919164Sgibbs call dma_finish 4509928Sgibbs 45113177Sgibbs/* 45213177Sgibbs * Copy data from FIFO into SCB data pointer and data count. This assumes 45319164Sgibbs * that the SG segments are of the form: 45413177Sgibbs * 45513177Sgibbs * struct ahc_dma_seg { 45619164Sgibbs * u_int32_t addr; four bytes, little-endian order 45719164Sgibbs * u_int32_t len; four bytes, little endian order 45813177Sgibbs * }; 45913177Sgibbs */ 46019164Sgibbs mvi HADDR0 call dfdat_in_7 4619928Sgibbs 46213177Sgibbs/* Load STCNT as well. It is a mirror of HCNT */ 46319164Sgibbs call set_stcnt_from_hcnt 46419164Sgibbs test SSTAT1,PHASEMIS jz data_phase_loop 4654568Sgibbs 4669928Sgibbsdata_phase_finish: 46713177Sgibbs/* 46813177Sgibbs * After a DMA finishes, save the SG and STCNT residuals back into the SCB 46913177Sgibbs * We use STCNT instead of HCNT, since it's a reflection of how many bytes 47013177Sgibbs * were transferred on the SCSI (as opposed to the host) bus. 47113177Sgibbs */ 47213690Sgibbs mov SCB_RESID_DCNT0,STCNT0 47313690Sgibbs mov SCB_RESID_DCNT1,STCNT1 47413690Sgibbs mov SCB_RESID_DCNT2,STCNT2 47513177Sgibbs mov SCB_RESID_SGCNT, SG_COUNT 4764568Sgibbs jmp ITloop 4774568Sgibbs 47816260Sgibbsdata_phase_overrun: 47913177Sgibbs/* 48016260Sgibbs * Turn off BITBUCKET mode and notify the host 48116260Sgibbs */ 48216260Sgibbs and SXFRCTL1,0x7f /* ~BITBUCKET */ 48316260Sgibbs mvi INTSTAT,DATA_OVERRUN 48416260Sgibbs jmp ITloop 48516260Sgibbs 48616260Sgibbs/* 48715328Sgibbs * Command phase. Set up the DMA registers and let 'er rip. 48813177Sgibbs */ 4894568Sgibbsp_command: 4904568Sgibbs call assert 4914568Sgibbs 49213177Sgibbs/* 49315328Sgibbs * Load HADDR and HCNT. 49413177Sgibbs */ 49519164Sgibbs mvi DINDEX, HADDR0 49619164Sgibbs mvi SCB_CMDPTR call bcopy_5 49713690Sgibbs clr HCNT1 49813690Sgibbs clr HCNT2 4994568Sgibbs 50019164Sgibbs call set_stcnt_from_hcnt 5014568Sgibbs 5024568Sgibbs mvi 0x3d call dma # SCSIEN|SDMAEN|HDMAEN| 5034568Sgibbs # DIRECTION|FIFORESET 5044568Sgibbs jmp ITloop 5054568Sgibbs 50613177Sgibbs/* 50713177Sgibbs * Status phase. Wait for the data byte to appear, then read it 50813177Sgibbs * and store it into the SCB. 50913177Sgibbs */ 5104568Sgibbsp_status: 51113177Sgibbs mvi SCB_TARGET_STATUS call inb_first 5129954Sgibbs jmp mesgin_done 5134568Sgibbs 51413177Sgibbs/* 51515328Sgibbs * Message out phase. If there is not an active message, but the target 51613177Sgibbs * took us into this phase anyway, build a no-op message and send it. 51713177Sgibbs */ 5184568Sgibbsp_mesgout: 51913177Sgibbs test MSG_LEN, 0xff jnz p_mesgout_start 52018762Sgibbs mvi MSG_NOOP call mk_mesg /* build NOP message */ 52113177Sgibbsp_mesgout_start: 52213177Sgibbs/* 52313177Sgibbs * Set up automatic PIO transfer from MSG0. Bit 3 in 52413177Sgibbs * SXFRCTL0 (SPIOEN) is already on. 52513177Sgibbs */ 52613177Sgibbs mvi SINDEX,MSG0 5274568Sgibbs mov DINDEX,MSG_LEN 5284568Sgibbs 52913177Sgibbs/* 53013177Sgibbs * When target asks for a byte, drop ATN if it's the last one in 53113177Sgibbs * the message. Otherwise, keep going until the message is exhausted. 53213177Sgibbs * 53313177Sgibbs * Keep an eye out for a phase change, in case the target issues 53413177Sgibbs * a MESSAGE REJECT. 53513177Sgibbs */ 53613177Sgibbsp_mesgout_loop: 53716198Sgibbs test SSTAT1,PHASEMIS jnz p_mesgout_phasemis 53813177Sgibbs test SSTAT0,SPIORDY jz p_mesgout_loop 53916198Sgibbs test SSTAT1,PHASEMIS jnz p_mesgout_phasemis 54013177Sgibbs cmp DINDEX,1 jne p_mesgout_outb /* last byte? */ 54113177Sgibbs mvi CLRSINT1,CLRATNO /* drop ATN */ 54213177Sgibbsp_mesgout_outb: 54313177Sgibbs dec DINDEX 54413386Sgibbs or CLRSINT0, CLRSPIORDY 5454568Sgibbs mov SCSIDATL,SINDIR 54613313Sgibbs 5474568Sgibbsp_mesgout4: 54813177Sgibbs test DINDEX,0xff jnz p_mesgout_loop 5494568Sgibbs 55013177Sgibbs/* 55113177Sgibbs * If the next bus phase after ATN drops is a message out, it means 55213177Sgibbs * that the target is requesting that the last message(s) be resent. 55313177Sgibbs */ 55413177Sgibbsp_mesgout_snoop: 55513177Sgibbs test SSTAT1,BUSFREE jnz p_mesgout_done 55613177Sgibbs test SSTAT1,REQINIT jz p_mesgout_snoop 5574568Sgibbs 55813177Sgibbs test SSTAT1,PHASEMIS jnz p_mesgout_done 5594568Sgibbs 56013690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 56113177Sgibbs 5624568Sgibbs jmp ITloop 5634568Sgibbs 56413177Sgibbsp_mesgout_phasemis: 56515328Sgibbs mvi CLRSINT1,CLRATNO /* Be sure to turn ATNO off */ 56613177Sgibbsp_mesgout_done: 56713177Sgibbs clr MSG_LEN /* no active msg */ 5684568Sgibbs jmp ITloop 5694568Sgibbs 57013177Sgibbs/* 57113177Sgibbs * Message in phase. Bytes are read using Automatic PIO mode. 57213177Sgibbs */ 5734568Sgibbsp_mesgin: 57413177Sgibbs mvi A call inb_first /* read the 1st message byte */ 57513177Sgibbs mov REJBYTE,A /* save it for the driver */ 5764568Sgibbs 57718762Sgibbs test A,MSG_IDENTIFYFLAG jnz mesgin_identify 57813177Sgibbs cmp A,MSG_DISCONNECT je mesgin_disconnect 57918762Sgibbs cmp A,MSG_SAVEDATAPOINTER je mesgin_sdptrs 58013177Sgibbs cmp ALLZEROS,A je mesgin_complete 58118762Sgibbs cmp A,MSG_RESTOREPOINTERS je mesgin_rdptrs 58213177Sgibbs cmp A,MSG_EXTENDED je mesgin_extended 58318762Sgibbs cmp A,MSG_MESSAGE_REJECT je mesgin_reject 5844568Sgibbs 5859954Sgibbsrej_mesgin: 58613177Sgibbs/* 58719164Sgibbs * We have no idea what this message in is, so we issue a message reject 58819164Sgibbs * and hope for the best. In any case, rejection should be a rare 58919164Sgibbs * occurrence - signal the driver when it happens. 59013177Sgibbs */ 59113690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 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/* 62119164Sgibbs * First check for residuals 62213177Sgibbs */ 62319164Sgibbs test SCB_RESID_SGCNT,0xff jnz upload_scb 62419164Sgibbs test SCB_TARGET_STATUS,0xff jz status_ok /* Good Status? */ 62519164Sgibbsupload_scb: 62619164Sgibbs mvi DMAPARAMS, 0x9 /* HDMAEN | FIFORESET*/ 62719164Sgibbs mov SCB_TAG call dma_scb 6287532Sgibbscheck_status: 62919164Sgibbs test SCB_TARGET_STATUS,0xff jz status_ok /* Just a residual? */ 63013177Sgibbs mvi INTSTAT,BAD_STATUS /* let driver know */ 63113177Sgibbs cmp RETURN_1, SEND_SENSE jne status_ok 63219164Sgibbs /* This SCB becomes the next to execute as it will retrieve sense */ 63319164Sgibbs mov SCB_LINKED_NEXT, SCB_TAG 63419164Sgibbs jmp dma_next_scb 6355326Sgibbs 6364568Sgibbsstatus_ok: 63713177Sgibbs/* First, mark this target as free. */ 63813177Sgibbs test SCB_CONTROL,TAG_ENB jnz test_immediate /* 63913177Sgibbs * Tagged commands 64013177Sgibbs * don't busy the 64113177Sgibbs * target. 64213177Sgibbs */ 64319164Sgibbs mov SAVED_SCBPTR, SCBPTR 64419164Sgibbs mov SAVED_LINKPTR, SCB_LINKED_NEXT 64519218Sgibbs mov SCB_TCL call index_untagged_scb 64619164Sgibbs mov DINDIR, SAVED_LINKPTR 64719164Sgibbs mov SCBPTR, SAVED_SCBPTR 6485326Sgibbs 64913177Sgibbstest_immediate: 65013177Sgibbs test SCB_CMDLEN,0xff jnz complete /* Immediate message complete */ 65113177Sgibbs/* 65213177Sgibbs * Pause the sequencer until the driver gets around to handling the command 65313177Sgibbs * complete. This is so that any action that might require carefull timing 65413177Sgibbs * with the completion of this command can occur. 65513177Sgibbs */ 6569810Sgibbs mvi INTSTAT,IMMEDDONE 65719164Sgibbs jmp dma_next_scb 6585326Sgibbscomplete: 65919164Sgibbs /* Post the SCB and issue an interrupt */ 66015328Sgibbs mov QOUTFIFO,SCB_TAG 6617532Sgibbs mvi INTSTAT,CMDCMPLT 66219164Sgibbs 66319164Sgibbsdma_next_scb: 66419164Sgibbs cmp SCB_LINKED_NEXT, SCB_LIST_NULL je mesgin_done 66519164Sgibbs test FLAGS, PAGESCBS jnz dma_next_scb2 66619164Sgibbs /* Only DMA on top of ourselves if we are the SCB to download */ 66719164Sgibbs mov A, SCB_LINKED_NEXT 66819164Sgibbs cmp SCB_TAG, A je dma_next_scb2 66919164Sgibbs mov SCBPTR, A 67019164Sgibbs jmp add_to_waiting_list 67119164Sgibbsdma_next_scb2: 67219164Sgibbs mvi DMAPARAMS, 0xd /* HDMAEN|DIRECTION|FIFORESET */ 67319218Sgibbs mov SCB_LINKED_NEXT call dma_scb 67419164Sgibbsadd_to_waiting_list: 67519164Sgibbs mov SCB_NEXT,WAITING_SCBH 67619164Sgibbs mov WAITING_SCBH, SCBPTR 67719164Sgibbs or FLAGS, SCB_LISTED 6789954Sgibbs jmp mesgin_done 6794568Sgibbs 68013177Sgibbs/* 68118762Sgibbs * Is it an extended message? Copy the message to our message buffer and 68218762Sgibbs * notify the host. The host will tell us whether to reject this message, 68318762Sgibbs * respond to it with the message that the host placed in our message buffer, 68418762Sgibbs * or simply to do nothing. 68513177Sgibbs */ 6869954Sgibbsmesgin_extended: 68718762Sgibbs mvi MSGIN_EXT_LEN call inb_next 68818762Sgibbs mov A, MSGIN_EXT_LEN 68918762Sgibbsmesgin_extended_loop: 69019164Sgibbs mov DINDEX call inb_next 69118762Sgibbs dec A 69219164Sgibbs cmp DINDEX, MSGIN_EXT_LASTBYTE jne mesgin_extended_loop_test 69319164Sgibbs dec DINDEX /* dump by repeatedly filling the last byte */ 69419164Sgibbsmesgin_extended_loop_test: 69519164Sgibbs test A, 0xFF jnz mesgin_extended_loop 69618762Sgibbsmesgin_extended_intr: 69718762Sgibbs mvi INTSTAT,EXTENDED_MSG /* let driver know */ 69818762Sgibbs cmp RETURN_1,SEND_REJ je rej_mesgin 69918762Sgibbs cmp RETURN_1,SEND_MSG jne mesgin_done 70018762Sgibbs/* The kernel has setup a message to be sent */ 70113690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 7029954Sgibbs jmp mesgin_done 7035562Sgibbs 70413177Sgibbs/* 70513177Sgibbs * Is it a disconnect message? Set a flag in the SCB to remind us 70613177Sgibbs * and await the bus going free. 70713177Sgibbs */ 7089954Sgibbsmesgin_disconnect: 70913177Sgibbs or SCB_CONTROL,DISCONNECTED 71015328Sgibbs test FLAGS, PAGESCBS jz mesgin_done 71119164Sgibbs call add_scb_to_disc_list 71219164Sgibbs or FLAGS, SCB_LISTED 71319164Sgibbs jmp mesgin_done 71419164Sgibbs 71515328Sgibbs/* 71619164Sgibbs * Save data pointers message: 71719164Sgibbs * Copying RAM values back to SCB, for Save Data Pointers message, but 71819164Sgibbs * only if we've actually been into a data phase to change them. This 71919164Sgibbs * protects against bogus data in scratch ram and the residual counts 72019164Sgibbs * since they are only initialized when we go into data_in or data_out. 72115328Sgibbs */ 72219164Sgibbsmesgin_sdptrs: 72319164Sgibbs test FLAGS, DPHASE jz mesgin_done 72419164Sgibbs mov SCB_SGCOUNT,SG_COUNT 7254568Sgibbs 72619164Sgibbs /* The SCB SGPTR becomes the next one we'll download */ 72719164Sgibbs mvi DINDEX, SCB_SGPTR 72819164Sgibbs mvi SG_NEXT0 call bcopy_4 72919164Sgibbs 73019164Sgibbs /* The SCB DATAPTR0 becomes the current SHADDR */ 73119164Sgibbs mvi DINDEX, SCB_DATAPTR0 73219164Sgibbs mvi SHADDR0 call bcopy_4 73319164Sgibbs 73413177Sgibbs/* 73519164Sgibbs * Use the residual number since STCNT is corrupted by any message transfer. 73613177Sgibbs */ 73719164Sgibbs mvi SCB_RESID_DCNT0 call bcopy_3 73819164Sgibbs 7399954Sgibbs jmp mesgin_done 7404568Sgibbs 74113177Sgibbs/* 74213177Sgibbs * Restore pointers message? Data pointers are recopied from the 74313177Sgibbs * SCB anytime we enter a data phase for the first time, so all 74413177Sgibbs * we need to do is clear the DPHASE flag and let the data phase 74513177Sgibbs * code do the rest. 74613177Sgibbs */ 7479954Sgibbsmesgin_rdptrs: 74815328Sgibbs and FLAGS,0xef /* 74913177Sgibbs * !DPHASE we'll reload them 75013177Sgibbs * the next time through 75113177Sgibbs */ 7529954Sgibbs jmp mesgin_done 7534568Sgibbs 75413177Sgibbs/* 75513177Sgibbs * Identify message? For a reconnecting target, this tells us the lun 75613177Sgibbs * that the reconnection is for - find the correct SCB and switch to it, 75713177Sgibbs * clearing the "disconnected" bit so we don't "find" it by accident later. 75813177Sgibbs */ 7599954Sgibbsmesgin_identify: 76013177Sgibbs test A,0x78 jnz rej_mesgin /*!DiscPriv|!LUNTAR|!Reserved*/ 76113177Sgibbs and A,0x07 /* lun in lower three bits */ 76219164Sgibbs or SAVED_TCL,A /* SAVED_TCL should be complete now */ 76313177Sgibbs call inb_last /* ACK */ 76413177Sgibbs 76513177Sgibbs/* 76613177Sgibbs * Here we "snoop" the bus looking for a SIMPLE QUEUE TAG message. 76715328Sgibbs * If we get one, we use the tag returned to switch to find the proper 76815328Sgibbs * SCB. With SCB paging, this requires using findSCB for both tagged 76915328Sgibbs * and non-tagged transactions since the SCB may exist in any slot. 77015328Sgibbs * If we're not using SCB paging, we can use the tag as the direct 77115328Sgibbs * index to the SCB. 77213177Sgibbs */ 77315328Sgibbs mvi ARG_1,SCB_LIST_NULL /* Default to no-tag */ 77413177Sgibbssnoop_tag_loop: 77518762Sgibbs test SSTAT1,BUSFREE jnz use_findSCB 77618762Sgibbs test SSTAT1,REQINIT jz snoop_tag_loop 77718762Sgibbs test SSTAT1,PHASEMIS jnz use_findSCB 77818762Sgibbs mvi A call inb_first 77918762Sgibbs cmp A,MSG_SIMPLE_Q_TAG jne use_findSCB 7806608Sgibbsget_tag: 78119218Sgibbs or FLAGS, TAGGED_SCB 78213177Sgibbs mvi ARG_1 call inb_next /* tag value */ 78313177Sgibbs/* 78413177Sgibbs * See if the tag is in range. The tag is < SCBCOUNT if we add 78513177Sgibbs * the complement of SCBCOUNT to the incomming tag and there is 78613177Sgibbs * no carry. 78713177Sgibbs */ 78813177Sgibbs mov A,COMP_SCBCOUNT 78913177Sgibbs add SINDEX,A,ARG_1 79019218Sgibbs jc send_abort_msg 79113177Sgibbs 79213177Sgibbs/* 79315328Sgibbs * Ensure that the SCB the tag points to is for an SCB transaction 79413177Sgibbs * to the reconnecting target. 79513177Sgibbs */ 79615328Sgibbs test FLAGS, PAGESCBS jz index_by_tag 79715328Sgibbsuse_findSCB: 79815328Sgibbs mov ALLZEROS call findSCB /* Have to search */ 79919218Sgibbs cmp SINDEX, SCB_LIST_NULL, je not_found 80015328Sgibbssetup_SCB: 80115328Sgibbs and SCB_CONTROL,0xfb /* clear disconnect bit in SCB */ 80215328Sgibbs or FLAGS,IDENTIFY_SEEN /* make note of IDENTIFY */ 80319164Sgibbs test SCB_CONTROL,TAG_ENB jnz mesgin_done /* Ack Tag */ 80415328Sgibbs jmp ITloop 80515328Sgibbsindex_by_tag: 80613177Sgibbs mov SCBPTR,ARG_1 80719218Sgibbs mov A, SAVED_TCL 80819218Sgibbs cmp SCB_TCL,A jne send_abort_msg 80919218Sgibbs test SCB_CONTROL,TAG_ENB jz send_abort_msg 81013177Sgibbs jmp setup_SCB 81115328Sgibbs 81219218Sgibbsnot_found: 81319218Sgibbs mvi INTSTAT, NO_MATCH 81419218Sgibbssend_abort_msg: 81513690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 81619218Sgibbs test FLAGS, TAGGED_SCB jnz abort_tag_msg 81719218Sgibbs mvi MSG_ABORT call mk_mesg 81819218Sgibbs jmp mesgin_done 81919164Sgibbsabort_tag_msg: 82015328Sgibbs mvi MSG_ABORT_TAG call mk_mesg /* ABORT TAG message */ 82113177Sgibbs jmp mesgin_done 8226608Sgibbs 82313177Sgibbs/* 82413177Sgibbs * Message reject? Let the kernel driver handle this. If we have an 82513177Sgibbs * outstanding WDTR or SDTR negotiation, assume that it's a response from 82613177Sgibbs * the target selecting 8bit or asynchronous transfer, otherwise just ignore 82713177Sgibbs * it since we have no clue what it pertains to. 82813177Sgibbs */ 8299954Sgibbsmesgin_reject: 83013177Sgibbs mvi INTSTAT, REJECT_MSG 8319954Sgibbs jmp mesgin_done 8325562Sgibbs 83313177Sgibbs/* 83413177Sgibbs * [ ADD MORE MESSAGE HANDLING HERE ] 83513177Sgibbs */ 8364568Sgibbs 83713177Sgibbs/* 83813177Sgibbs * Bus free phase. It might be useful to interrupt the device 83913177Sgibbs * driver if we aren't expecting this. For now, make sure that 84013177Sgibbs * ATN isn't being asserted and look for a new command. 84113177Sgibbs */ 8424568Sgibbsp_busfree: 84313177Sgibbs mvi CLRSINT1,CLRATNO 84414449Sgibbs clr LASTPHASE 8458567Sdg 84613177Sgibbs/* 84713177Sgibbs * if this is an immediate command, perform a psuedo command complete to 84813177Sgibbs * notify the driver. 84913177Sgibbs */ 85013177Sgibbs test SCB_CMDLEN,0xff jz status_ok 85119164Sgibbs test FLAGS, SCB_LISTED jnz start 85219164Sgibbs /* 85319164Sgibbs * This SCB didn't disconnect or have a command complete, 85419164Sgibbs * so put it on the free queue. It was probably the 85519164Sgibbs * result of an abort of some sort. This prevents us 85619164Sgibbs * from "leaking" SCBs. 85719164Sgibbs */ 85819164Sgibbs call add_scb_to_free_list 85913177Sgibbs jmp start 8604568Sgibbs 86113177Sgibbs/* 86213177Sgibbs * Locking the driver out, build a one-byte message passed in SINDEX 86313177Sgibbs * if there is no active message already. SINDEX is returned intact. 86413177Sgibbs */ 8654568Sgibbsmk_mesg: 86613177Sgibbs mvi SEQCTL,0x50 /* PAUSEDIS|FASTMODE */ 86713177Sgibbs test MSG_LEN,0xff jz mk_mesg1 /* Should always succeed */ 86813177Sgibbs 86913177Sgibbs /* 87013177Sgibbs * Hmmm. For some reason the mesg buffer is in use. 87113177Sgibbs * Tell the driver. It should look at SINDEX to find 87213177Sgibbs * out what we wanted to use the buffer for and resolve 87313177Sgibbs * the conflict. 87413177Sgibbs */ 87513177Sgibbs mvi SEQCTL,0x10 /* !PAUSEDIS|FASTMODE */ 87613690Sgibbs mvi INTSTAT,MSG_BUFFER_BUSY 8774568Sgibbs 8784568Sgibbsmk_mesg1: 87913177Sgibbs mvi MSG_LEN,1 /* length = 1 */ 88013177Sgibbs mov MSG0,SINDEX /* 1-byte message */ 88113177Sgibbs mvi SEQCTL,0x10 ret /* !PAUSEDIS|FASTMODE */ 8824568Sgibbs 88313177Sgibbs/* 88413177Sgibbs * Functions to read data in Automatic PIO mode. 88513177Sgibbs * 88613177Sgibbs * According to Adaptec's documentation, an ACK is not sent on input from 88713177Sgibbs * the target until SCSIDATL is read from. So we wait until SCSIDATL is 88813177Sgibbs * latched (the usual way), then read the data byte directly off the bus 88913177Sgibbs * using SCSIBUSL. When we have pulled the ATN line, or we just want to 89013177Sgibbs * acknowledge the byte, then we do a dummy read from SCISDATL. The SCSI 89113177Sgibbs * spec guarantees that the target will hold the data byte on the bus until 89213177Sgibbs * we send our ACK. 89313177Sgibbs * 89413177Sgibbs * The assumption here is that these are called in a particular sequence, 89513177Sgibbs * and that REQ is already set when inb_first is called. inb_{first,next} 89613177Sgibbs * use the same calling convention as inb. 89713177Sgibbs */ 89813177Sgibbs 89913177Sgibbsinb_next: 90013386Sgibbs or CLRSINT0, CLRSPIORDY 90113360Sgibbs mov NONE,SCSIDATL /*dummy read from latch to ACK*/ 90213360Sgibbsinb_next_wait: 90316198Sgibbs test SSTAT1,PHASEMIS jnz mesgin_phasemis 90415951Sgibbs test SSTAT0,SPIORDY jz inb_next_wait /* wait for next byte */ 90513313Sgibbsinb_first: 9064568Sgibbs mov DINDEX,SINDEX 90716002Sgibbs test SSTAT1,PHASEMIS jnz mesgin_phasemis 90813177Sgibbs mov DINDIR,SCSIBUSL ret /*read byte directly from bus*/ 90913177Sgibbsinb_last: 91013360Sgibbs mov NONE,SCSIDATL ret /*dummy read from latch to ACK*/ 9114568Sgibbs 91213177Sgibbsmesgin_phasemis: 91313177Sgibbs/* 91413177Sgibbs * We expected to receive another byte, but the target changed phase 91513177Sgibbs */ 91613177Sgibbs mvi INTSTAT, MSGIN_PHASEMIS 91713177Sgibbs jmp ITloop 9184568Sgibbs 91913177Sgibbs/* 92013177Sgibbs * DMA data transfer. HADDR and HCNT must be loaded first, and 92113177Sgibbs * SINDEX should contain the value to load DFCNTRL with - 0x3d for 92213177Sgibbs * host->scsi, or 0x39 for scsi->host. The SCSI channel is cleared 92313177Sgibbs * during initialization. 92413177Sgibbs */ 9254568Sgibbsdma: 9264568Sgibbs mov DFCNTRL,SINDEX 9274568Sgibbsdma1: 92813177Sgibbs test SSTAT0,DMADONE jnz dma3 92913177Sgibbs test SSTAT1,PHASEMIS jz dma1 /* ie. underrun */ 9304568Sgibbs 93113177Sgibbs/* 93213177Sgibbs * We will be "done" DMAing when the transfer count goes to zero, or 93313177Sgibbs * the target changes the phase (in light of this, it makes sense that 93413177Sgibbs * the DMA circuitry doesn't ACK when PHASEMIS is active). If we are 93513177Sgibbs * doing a SCSI->Host transfer, the data FIFO should be flushed auto- 93613177Sgibbs * magically on STCNT=0 or a phase change, so just wait for FIFO empty 93713177Sgibbs * status. 93813177Sgibbs */ 9394568Sgibbsdma3: 94013177Sgibbs test SINDEX,DIRECTION jnz dma5 9414568Sgibbsdma4: 94213177Sgibbs test DFSTATUS,FIFOEMP jz dma4 9434568Sgibbs 94413177Sgibbs/* 94513177Sgibbs * Now shut the DMA enables off and make sure that the DMA enables are 94613177Sgibbs * actually off first lest we get an ILLSADDR. 94713177Sgibbs */ 9484568Sgibbsdma5: 94913177Sgibbs /* disable DMA, but maintain WIDEODD */ 95013690Sgibbs and DFCNTRL,WIDEODD 9514568Sgibbsdma6: 95213177Sgibbs test DFCNTRL,0x38 jnz dma6 /* SCSIENACK|SDMAENACK|HDMAENACK */ 95318762Sgibbsreturn: 9544568Sgibbs ret 9554568Sgibbs 95613177Sgibbs/* 95713177Sgibbs * Common SCSI initialization for selection and reselection. Expects 95813177Sgibbs * the target SCSI ID to be in the upper four bits of SINDEX, and A's 95913177Sgibbs * contents are stomped on return. 96013177Sgibbs */ 9618104Sgibbsinitialize_scsiid: 96213177Sgibbs and SINDEX,0xf0 /* Get target ID */ 96319164Sgibbs mov SAVED_TCL, SINDEX /* Update the target portion of this */ 9645775Sgibbs and A,0x0f,SCSIID 9655775Sgibbs or SINDEX,A 9668104Sgibbs mov SCSIID,SINDEX ret 9675326Sgibbs 96813177Sgibbs/* 96913177Sgibbs * Assert that if we've been reselected, then we've seen an IDENTIFY 97013177Sgibbs * message. 97113177Sgibbs */ 9724568Sgibbsassert: 97313177Sgibbs test FLAGS,RESELECTED jz return /* reselected? */ 97413177Sgibbs test FLAGS,IDENTIFY_SEEN jnz return /* seen IDENTIFY? */ 9754568Sgibbs 97619164Sgibbs mvi INTSTAT,NO_IDENT ret /* no - tell the kernel */ 9774568Sgibbs 97813177Sgibbs/* 97919218Sgibbs * Locate a disconnected SCB either by SAVED_TCL (ARG_1 is SCB_LIST_NULL) 98019218Sgibbs * or by the SCBIDn ARG_1. The search begins at the SCB index passed in 98119218Sgibbs * via SINDEX. If the SCB cannot be found, SINDEX will be SCB_LIST_NULL, 98219218Sgibbs * otherwise, SCBPTR is set to the proper SCB. 98313177Sgibbs */ 9844568SgibbsfindSCB: 98515328Sgibbs mov SCBPTR,SINDEX /* switch to next SCB */ 98613177Sgibbs test SCB_CONTROL,DISCONNECTED jz findSCB1 /*should be disconnected*/ 98719218Sgibbs cmp ARG_1, SCB_LIST_NULL jne findBySCBID 98819218Sgibbs mov A, SAVED_TCL 98919218Sgibbs cmp SCB_TCL,A je foundSCB /* target ID/channel/lun match? */ 99019164SgibbsfindSCB1: 99119164Sgibbs inc SINDEX 99219164Sgibbs mov A,SCBCOUNT 99319164Sgibbs cmp SINDEX,A jne findSCB 99419164Sgibbs/* 99519164Sgibbs * We didn't find it. If we're paging, pull an SCB and DMA down the 99619164Sgibbs * one we want. If we aren't paging or the SCB we dma down has the 99719218Sgibbs * abort flag set, return not found. 99819164Sgibbs */ 99919218Sgibbs test FLAGS, PAGESCBS jz find_error 100019164Sgibbs call get_free_or_disc_scb 100119218Sgibbs cmp ARG_1, SCB_LIST_NULL jne find_dma_scb 100219218Sgibbs mov SAVED_TCL call index_untagged_scb 100319218Sgibbs mov ARG_1, SINDIR /* SCBID of SCB to fetch */ 100419164Sgibbsfind_dma_scb: 100519164Sgibbs mvi DMAPARAMS, 0xd /* HDMAEN|DIRECTION|FIFORESET */ 100619218Sgibbs mov ARG_1 call dma_scb 100719164Sgibbs test SCB_CONTROL, ABORT_SCB jz return 100819218Sgibbsfind_error: 100919218Sgibbs mvi SINDEX, SCB_LIST_NULL ret 101019218SgibbsfindBySCBID: 101115328Sgibbs mov A, ARG_1 /* Tag passed in ARG_1 */ 101215328Sgibbs cmp SCB_TAG,A jne findSCB1 /* Found it? */ 101315328SgibbsfoundSCB: 101419218Sgibbs test SCB_CONTROL, ABORT_SCB jnz find_error 101519164Sgibbs test FLAGS,PAGESCBS jz return 101619164Sgibbsrem_scb_from_disc_list: 101715328Sgibbs/* Remove this SCB from the disconnection list */ 101815328Sgibbs cmp SCB_NEXT,SCB_LIST_NULL je unlink_prev 101915328Sgibbs mov SAVED_LINKPTR, SCB_PREV 102015328Sgibbs mov SCBPTR, SCB_NEXT 102115328Sgibbs mov SCB_PREV, SAVED_LINKPTR 102215328Sgibbs mov SCBPTR, SINDEX 102315328Sgibbsunlink_prev: 102415328Sgibbs cmp SCB_PREV,SCB_LIST_NULL je rHead/* At the head of the list */ 102515328Sgibbs mov SAVED_LINKPTR, SCB_NEXT 102615328Sgibbs mov SCBPTR, SCB_PREV 102715328Sgibbs mov SCB_NEXT, SAVED_LINKPTR 102819164Sgibbs mov SCBPTR, SINDEX ret 102915328SgibbsrHead: 103019164Sgibbs mov DISCONNECTED_SCBH,SCB_NEXT ret 10314568Sgibbs 103219164Sgibbsset_stcnt_from_hcnt: 103319164Sgibbs mov STCNT0, HCNT0 103419164Sgibbs mov STCNT1, HCNT1 103519164Sgibbs mov STCNT2, HCNT2 ret 10364568Sgibbs 103719164Sgibbsbcopy_7: 103819164Sgibbs mov DINDIR, SINDIR 103919164Sgibbs mov DINDIR, SINDIR 104019164Sgibbsbcopy_5: 104119164Sgibbs mov DINDIR, SINDIR 104219164Sgibbsbcopy_4: 104319164Sgibbs mov DINDIR, SINDIR 104419164Sgibbsbcopy_3: 104519164Sgibbs mov DINDIR, SINDIR 104619164Sgibbs mov DINDIR, SINDIR 104719164Sgibbs mov DINDIR, SINDIR ret 10484568Sgibbs 104919164Sgibbsdma_scb: 105019164Sgibbs /* 105119164Sgibbs * SCB index is in SINDEX. Determine the physical address in 105219164Sgibbs * the host where this SCB is located and load HADDR with it. 105319164Sgibbs */ 105419164Sgibbs shr DINDEX, SINDEX, 3 105519164Sgibbs shl A, SINDEX, 5 105619164Sgibbs add HADDR0, A, HSCB_ADDR0 105719164Sgibbs mov A, DINDEX 105819164Sgibbs adc HADDR1, A, HSCB_ADDR1 105919164Sgibbs clr A 106019164Sgibbs adc HADDR2, A, HSCB_ADDR2 106119164Sgibbs adc HADDR3, A, HSCB_ADDR3 106219164Sgibbs /* Setup Count */ 106319164Sgibbs mvi HCNT0, 28 106419164Sgibbs clr HCNT1 106519164Sgibbs clr HCNT2 106619164Sgibbs mov DFCNTRL, DMAPARAMS 106719164Sgibbs test DMAPARAMS, DIRECTION jnz dma_scb_fromhost 106819164Sgibbs /* Fill it with the SCB data */ 106919164Sgibbs call copy_scb_tofifo 107019164Sgibbs mvi DFCNTRL, 0xa /* HDMAEN | FIFOFLUSH */ 107119164Sgibbsdma_scb_fromhost: 107219164Sgibbs call dma_finish 107319164Sgibbs /* If we were putting the SCB, we are done */ 107419164Sgibbs test DMAPARAMS, DIRECTION jz return 107519164Sgibbs mvi SCBARRAY call dfdat_in_7 107619164Sgibbs call dfdat_in_7_continued 107719164Sgibbs call dfdat_in_7_continued 107819164Sgibbs jmp dfdat_in_7_continued 107919164Sgibbsdfdat_in_7: 108019164Sgibbs mov DINDEX,SINDEX 108119164Sgibbsdfdat_in_7_continued: 108219164Sgibbs mov DINDIR,DFDAT 108319164Sgibbs mov DINDIR,DFDAT 108419164Sgibbs mov DINDIR,DFDAT 108519164Sgibbs mov DINDIR,DFDAT 108619164Sgibbs mov DINDIR,DFDAT 108719164Sgibbs mov DINDIR,DFDAT 108819164Sgibbs mov DINDIR,DFDAT ret 108919164Sgibbs 109019164Sgibbscopy_scb_tofifo: 109119164Sgibbs mvi SCBARRAY call dfdat_out_7 109219164Sgibbs call dfdat_out_7 109319164Sgibbs call dfdat_out_7 109419164Sgibbsdfdat_out_7: 109519164Sgibbs mov DFDAT,SINDIR 109619164Sgibbs mov DFDAT,SINDIR 109719164Sgibbs mov DFDAT,SINDIR 109819164Sgibbs mov DFDAT,SINDIR 109919164Sgibbs mov DFDAT,SINDIR 110019164Sgibbs mov DFDAT,SINDIR 110119164Sgibbs mov DFDAT,SINDIR ret 110219164Sgibbs 110313177Sgibbs/* 110419164Sgibbs * Wait for DMA from host memory to data FIFO to complete, then disable 110519164Sgibbs * DMA and wait for it to acknowledge that it's off. 110613177Sgibbs */ 110719164Sgibbsdma_finish: 110819164Sgibbs test DFSTATUS,HDONE jz dma_finish 110919164Sgibbs /* Turn off DMA preserving WIDEODD */ 111019164Sgibbs and DFCNTRL,WIDEODD 111119164Sgibbsdma_finish2: 111219164Sgibbs test DFCNTRL,HDMAENACK jnz dma_finish2 111319164Sgibbs ret 11149928Sgibbs 111519164Sgibbsindex_untagged_scb: 111619218Sgibbs mov DINDEX, SINDEX 111719218Sgibbs shr DINDEX, 4 111819218Sgibbs and DINDEX, 0x03 /* Bottom two bits of tid */ 111919218Sgibbs add DINDEX, SCB_ACTIVE0 112019218Sgibbs shr A, SINDEX, 6 /* Target ID divided by 4 */ 112119164Sgibbs test SCB_TCL, SELBUSB jz index_untagged_scb2 112219164Sgibbs or A, 2 /* Add 2 positions */ 112319164Sgibbsindex_untagged_scb2: 112419164Sgibbs mov SCBPTR, A /* 112519164Sgibbs * Select the SCB with this 112619164Sgibbs * target's information. 112719164Sgibbs */ 112819218Sgibbs mov SINDEX, DINDEX ret 11299928Sgibbs 11304568Sgibbs 113119164Sgibbsget_free_or_disc_scb: 113219164Sgibbs mov SINDEX, ALLZEROS 113319164Sgibbs cmp FREE_SCBH, SCB_LIST_NULL jne get_free_scb 113419164Sgibbs cmp DISCONNECTED_SCBH, SCB_LIST_NULL je return_error 113519164Sgibbs mov SCBPTR, DISCONNECTED_SCBH 113613177Sgibbs/* 113719164Sgibbs * If we are starting a new transaction, we have to ensure that 113819164Sgibbs * there is at least one SCB left in case a reselection wins out. 113913177Sgibbs */ 114019164Sgibbs test FLAGS, RESELECTED jnz dequeue_disc_scb 114119164Sgibbs cmp SCB_NEXT, SCB_LIST_NULL je return_error 114219164Sgibbsdequeue_disc_scb: 114319164Sgibbs/* 114419164Sgibbs * If we have a residual, then we are in the middle of some I/O 114519164Sgibbs * and we have to send this SCB back up to the kernel so that the 114619164Sgibbs * saved data pointers and residual information isn't lost. 114719164Sgibbs */ 114819164Sgibbs test SCB_RESID_SGCNT,0xff jz unlink_disc_scb 114919164Sgibbs mvi DMAPARAMS, 0x9 /* HDMAEN | FIFORESET*/ 115019164Sgibbs mov SCB_TAG call dma_scb 115119164Sgibbsunlink_disc_scb: 115219164Sgibbs call rem_scb_from_disc_list 115319164Sgibbs ret 115419164Sgibbsget_free_scb: 115519164Sgibbs/* 115619164Sgibbs * If we are starting a new transaction, we have to ensure that 115719164Sgibbs * there is at least one SCB left in case a reselection wins out. 115819164Sgibbs */ 115919164Sgibbs test FLAGS, RESELECTED jnz dequeue_free_scb 116019164Sgibbs cmp SCB_NEXT, SCB_LIST_NULL jne dequeue_free_scb 116119164Sgibbs cmp DISCONNECTED_SCBH, SCB_LIST_NULL je return_error 116219164Sgibbsdequeue_free_scb: 116319164Sgibbs mov SCBPTR, FREE_SCBH 116419164Sgibbs mov FREE_SCBH, SCB_NEXT ret 116519164Sgibbsreturn_error: 116619164Sgibbs mvi SINDEX, SCB_LIST_NULL ret 11674568Sgibbs 116819164Sgibbsadd_scb_to_free_list: 116919164Sgibbs mov SCB_NEXT, FREE_SCBH 117019164Sgibbs mov FREE_SCBH, SCBPTR ret 11714568Sgibbs 117219164Sgibbsadd_scb_to_disc_list: 117313177Sgibbs/* 117419164Sgibbs * Link this SCB into the DISCONNECTED list. This list holds the 117519164Sgibbs * candidates for paging out an SCB if one is needed for a new command. 117619164Sgibbs * Modifying the disconnected list is a critical(pause dissabled) section. 117713177Sgibbs */ 117819164Sgibbs mvi SCB_PREV, SCB_LIST_NULL 117919164Sgibbs mov SCB_NEXT, DISCONNECTED_SCBH 118019164Sgibbs mov DISCONNECTED_SCBH, SCBPTR 118119164Sgibbs cmp SCB_NEXT,SCB_LIST_NULL je return 118219164Sgibbs mov SCBPTR,SCB_NEXT 118319164Sgibbs mov SCB_PREV,DISCONNECTED_SCBH 118419164Sgibbs mov SCBPTR,DISCONNECTED_SCBH ret 11854568Sgibbs 1186