aic7xxx.seq revision 15881
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 4215881SgibbsVERSION AIC7XXX_SEQ_VER "$Id: aic7xxx.seq,v 1.35 1996/05/21 18:32:22 gibbs Exp $" 435647Sgibbs 4413177Sgibbs#include "../../dev/aic7xxx/aic7xxx_reg.h" 454568Sgibbs 4613177Sgibbs/* 4713177Sgibbs * We can't just use ACCUM in the sequencer code because it 4813177Sgibbs * must be treated specially by the assembler, and it currently 4913690Sgibbs * looks for the symbol 'A'. This is the only register defined in 5013177Sgibbs * the assembler's symbol space. 5113177Sgibbs */ 5213177SgibbsA = ACCUM 534568Sgibbs 5413690Sgibbs/* After starting the selection hardware, we check for reconnecting targets 5513690Sgibbs * as well as for our selection to complete just in case the reselection wins 5613690Sgibbs * bus arbitration. The problem with this is that we must keep track of the 5713690Sgibbs * SCB that we've already pulled from the QINFIFO and started the selection 5813690Sgibbs * on just in case the reselection wins so that we can retry the selection at 5913690Sgibbs * a later time. This problem cannot be resolved by holding a single entry 6013690Sgibbs * in scratch ram since a reconnecting target can request sense and this will 6113690Sgibbs * create yet another SCB waiting for selection. The solution used here is to 6213690Sgibbs * use byte 27 of the SCB as a psuedo-next pointer and to thread a list 6313177Sgibbs * of SCBs that are awaiting selection. Since 0-0xfe are valid SCB offsets, 6413177Sgibbs * SCB_LIST_NULL is 0xff which is out of range. The kernel driver must 6513177Sgibbs * add an entry to this list everytime a request sense occurs. The sequencer 6613177Sgibbs * will automatically consume the entries. 6713177Sgibbs */ 684568Sgibbs 6913177Sgibbs/* 7014449Sgibbs * We assume that the kernel driver may reset us at any time, even in the 7114449Sgibbs * middle of a DMA, so clear DFCNTRL too. 7213177Sgibbs */ 7314449Sgibbsreset: 7414449Sgibbs clr DFCNTRL 7514449Sgibbs clr SCSISIGO /* De-assert BSY */ 7614449Sgibbs/* 7714449Sgibbs * We jump to start after every bus free. 7814449Sgibbs */ 7913177Sgibbsstart: 8015328Sgibbs and FLAGS,0x0f /* clear target specific flags */ 8113177Sgibbs mvi SCSISEQ,ENRSELI /* Always allow reselection */ 828104Sgibbspoll_for_work: 8313177Sgibbs /* 8413177Sgibbs * Are we a twin channel device? 8513177Sgibbs * For fairness, we check the other bus first, 8613177Sgibbs * since we just finished a transaction on the 8713177Sgibbs * current channel. 8813177Sgibbs */ 8913177Sgibbs test FLAGS,TWIN_BUS jz start2 9013177Sgibbs xor SBLKCTL,SELBUSB /* Toggle to the other bus */ 918104Sgibbs test SSTAT0,SELDI jnz reselect 9213177Sgibbs xor SBLKCTL,SELBUSB /* Toggle to the original bus */ 935326Sgibbsstart2: 948104Sgibbs test SSTAT0,SELDI jnz reselect 959395Sgibbs cmp WAITING_SCBH,SCB_LIST_NULL jne start_waiting 9614934Sgibbs mov A, QCNTMASK 9714934Sgibbs test QINCNT,A jz poll_for_work 984568Sgibbs 9913690Sgibbs/* 10013690Sgibbs * We have at least one queued SCB now and we don't have any 10113177Sgibbs * SCBs in the list of SCBs awaiting selection. Set the SCB 10213177Sgibbs * pointer from the FIFO so we see the right bank of SCB 10313177Sgibbs * registers. 10413177Sgibbs */ 1054568Sgibbs mov SCBPTR,QINFIFO 1064568Sgibbs 10713177Sgibbs/* 10813177Sgibbs * See if there is not already an active SCB for this target. This code 10913177Sgibbs * locks out on a per target basis instead of target/lun. Although this 11013177Sgibbs * is not ideal for devices that have multiple luns active at the same 11113177Sgibbs * time, it is faster than looping through all SCB's looking for active 11213177Sgibbs * commands. It may be benificial to make findscb a more general procedure 11313177Sgibbs * to see if the added cost of the search is negligible. This code also 11413177Sgibbs * assumes that the kernel driver will clear the active flags on board 11513177Sgibbs * initialization, board reset, and a target SELTO. Tagged commands 11613690Sgibbs * don't set the active bits since you can queue more than one command 11713690Sgibbs * at a time. We do, however, look to see if there are any non-tagged 11813690Sgibbs * I/Os in progress, and requeue the command if there are. Tagged and 11913690Sgibbs * non-tagged commands cannot be mixed to a single target. 12013177Sgibbs */ 1214568Sgibbs 1225647Sgibbstest_busy: 12313177Sgibbs mov FUNCTION1,SCB_TCL 1244568Sgibbs mov A,FUNCTION1 12513177Sgibbs test SCB_TCL,0x88 jz test_a /* Id < 8 && A channel */ 1265326Sgibbs 1275326Sgibbs test ACTIVE_B,A jnz requeue 12813177Sgibbs test SCB_CONTROL,TAG_ENB jnz start_scb 12913177Sgibbs /* Mark the current target as busy */ 13013177Sgibbs or ACTIVE_B,A 1315326Sgibbs jmp start_scb 1325326Sgibbs 13313177Sgibbs/* Place the currently active SCB back on the queue for later processing */ 1345326Sgibbsrequeue: 1354568Sgibbs mov QINFIFO, SCBPTR 1368104Sgibbs jmp poll_for_work 1374568Sgibbs 13813177Sgibbs/* 13913177Sgibbs * Pull the first entry off of the waiting for selection list 14013177Sgibbs * We don't have to "test_busy" because only transactions that 14113177Sgibbs * have passed that test can be in the waiting_scb list. 14213177Sgibbs */ 1438104Sgibbsstart_waiting: 1448104Sgibbs mov SCBPTR,WAITING_SCBH 14513177Sgibbs jmp start_scb2 1468104Sgibbs 1475326Sgibbstest_a: 14813177Sgibbs test ACTIVE_A,A jnz requeue 14913177Sgibbs test SCB_CONTROL,TAG_ENB jnz start_scb 15013177Sgibbs /* Mark the current target as busy */ 15113177Sgibbs or ACTIVE_A,A 1525326Sgibbs 1535326Sgibbsstart_scb: 15415328Sgibbs mov SCB_NEXT,WAITING_SCBH 15513177Sgibbs mov WAITING_SCBH, SCBPTR 15613177Sgibbsstart_scb2: 15713177Sgibbs and SINDEX,0xf7,SBLKCTL /* Clear the channel select bit */ 15813177Sgibbs and A,0x08,SCB_TCL /* Get new channel bit */ 15913177Sgibbs or SINDEX,A 16013177Sgibbs mov SBLKCTL,SINDEX /* select channel */ 16113177Sgibbs mov SCB_TCL call initialize_scsiid 1628104Sgibbs 16313177Sgibbs/* 16413177Sgibbs * Enable selection phase as an initiator, and do automatic ATN 16513177Sgibbs * after the selection. We do this now so that we can overlap the 16613177Sgibbs * rest of our work to set up this target with the arbitration and 16713177Sgibbs * selection bus phases. 16813177Sgibbs */ 1698104Sgibbsstart_selection: 17013177Sgibbs mvi SCSISEQ,0x58 /* ENSELO|ENAUTOATNO|ENRSELI */ 1714568Sgibbs 17213177Sgibbs/* 17313177Sgibbs * As soon as we get a successful selection, the target should go 17413177Sgibbs * into the message out phase since we have ATN asserted. Prepare 17513177Sgibbs * the message to send. 17613177Sgibbs * 17713177Sgibbs * Messages are stored in scratch RAM starting with a length byte 17813177Sgibbs * followed by the message itself. 17913177Sgibbs */ 18013177Sgibbs test SCB_CMDLEN,0xff jnz mk_identify /* 0 Length Command? */ 1818567Sdg 18213177Sgibbs/* 18313177Sgibbs * The kernel has sent us an SCB with no command attached. This implies 18413177Sgibbs * that the kernel wants to send a message of some sort to this target, 18513177Sgibbs * so we interrupt the driver, allow it to fill the message buffer, and 18613177Sgibbs * then go back into the arbitration loop 18713177Sgibbs */ 1888567Sdg mvi INTSTAT,AWAITING_MSG 1899917Sgibbs jmp wait_for_selection 1908567Sdg 19113177Sgibbsmk_identify: 19213177Sgibbs and A,DISCENB,SCB_CONTROL /* mask off disconnect privledge */ 1934568Sgibbs 19413690Sgibbs and MSG0,0x7,SCB_TCL /* lun */ 19513690Sgibbs or MSG0,A /* or in disconnect privledge */ 19613690Sgibbs or MSG0,MSG_IDENTIFY 19713690Sgibbs mvi MSG_LEN, 1 1984568Sgibbs 19913177Sgibbs test SCB_CONTROL,0xb0 jz !message /* WDTR, SDTR or TAG?? */ 20013177Sgibbs/* 20115328Sgibbs * Send a tag message if TAG_ENB is set in the SCB control block. 20215328Sgibbs * Use SCB_TAG (the position in the kernel's SCB array) as the tag value. 20313177Sgibbs */ 2044568Sgibbs 2056608Sgibbsmk_tag: 20613177Sgibbs mvi DINDEX, MSG1 20713177Sgibbs test SCB_CONTROL,TAG_ENB jz mk_tag_done 20815328Sgibbs and DINDIR,0x23,SCB_CONTROL 20915328Sgibbs mov DINDIR,SCB_TAG 2106608Sgibbs 21113177Sgibbs add MSG_LEN,COMP_MSG0,DINDEX /* update message length */ 2126608Sgibbs 2136608Sgibbsmk_tag_done: 2146608Sgibbs 21513690Sgibbs test SCB_CONTROL,0x90 jz !message /* NEEDWDTR|NEEDSDTR */ 21613177Sgibbs mov DINDEX call mk_dtr /* build DTR message if needed */ 2176608Sgibbs 2184568Sgibbs!message: 2199917Sgibbswait_for_selection: 22013177Sgibbs test SSTAT0,SELDO jnz select 22113177Sgibbs test SSTAT0,SELDI jz wait_for_selection 2224568Sgibbs 22313177Sgibbs/* 22413177Sgibbs * Reselection has been initiated by a target. Make a note that we've been 22513177Sgibbs * reselected, but haven't seen an IDENTIFY message from the target 22613177Sgibbs * yet. 22713177Sgibbs */ 2284568Sgibbsreselect: 22913177Sgibbs clr MSG_LEN /* Don't have anything in the mesg buffer */ 2308104Sgibbs mov SELID call initialize_scsiid 23113177Sgibbs or FLAGS,RESELECTED 23213177Sgibbs jmp select2 2334568Sgibbs 23413177Sgibbs/* 23513177Sgibbs * After the selection, remove this SCB from the "waiting for selection" 23613177Sgibbs * list. This is achieved by simply moving our "next" pointer into 23713177Sgibbs * WAITING_SCBH. Our next pointer will be set to null the next time this 23813177Sgibbs * SCB is used, so don't bother with it now. 23913177Sgibbs */ 2408104Sgibbsselect: 24115328Sgibbs mov WAITING_SCBH,SCB_NEXT 24215328Sgibbs or FLAGS,SELECTED 2438104Sgibbsselect2: 24413177Sgibbs/* 24513177Sgibbs * Set CLRCHN here before the target has entered a data transfer mode - 24613177Sgibbs * with synchronous SCSI, if you do it later, you blow away some 24713177Sgibbs * data in the SCSI FIFO that the target has already sent to you. 24813177Sgibbs */ 24913177Sgibbs or SXFRCTL0,CLRCHN 25013177Sgibbs/* 25113177Sgibbs * Initialize SCSIRATE with the appropriate value for this target. 25213177Sgibbs */ 25313177Sgibbs call ndx_dtr 25413177Sgibbs mov SCSIRATE,SINDIR 25513177Sgibbs 25615843Sgibbs/* 25715881Sgibbs * Initialize Ultra mode setting. 25815843Sgibbs */ 25915881Sgibbs mov FUNCTION1,SCSIID 26015881Sgibbs mov A,FUNCTION1 26115843Sgibbs and SINDEX,0xdf,SXFRCTL0 /* default to Ultra disabled */ 26215843Sgibbs test SCSIID, 0x80 jnz ultra_b /* Target ID > 7 */ 26315843Sgibbs test SBLKCTL, SELBUSB jnz ultra_b /* Second channel device */ 26415843Sgibbs test ULTRA_ENB,A jz set_sxfrctl0 26515843Sgibbs or SINDEX, ULTRAEN jmp set_sxfrctl0 26615843Sgibbsultra_b: 26715843Sgibbs test ULTRA_ENB_B,A jz set_sxfrctl0 26815843Sgibbs or SINDEX, ULTRAEN 26915843Sgibbs 27015843Sgibbsset_sxfrctl0: 27115843Sgibbs mov SXFRCTL0,SINDEX 27215843Sgibbs 27313177Sgibbs mvi SCSISEQ,ENAUTOATNP /* 27413177Sgibbs * ATN on parity errors 27513177Sgibbs * for "in" phases 27613177Sgibbs */ 27713177Sgibbs mvi CLRSINT1,CLRBUSFREE 27813177Sgibbs mvi CLRSINT0,0x60 /* CLRSELDI|CLRSELDO */ 27913177Sgibbs/* 28013177Sgibbs * Main loop for information transfer phases. If BSY is false, then 28113177Sgibbs * we have a bus free condition, expected or not. Otherwise, wait 28213177Sgibbs * for the target to assert REQ before checking MSG, C/D and I/O 28313177Sgibbs * for the bus phase. 28413177Sgibbs * 28513177Sgibbs */ 2864568SgibbsITloop: 28713177Sgibbs test SSTAT1,BUSFREE jnz p_busfree 28813177Sgibbs test SSTAT1,REQINIT jz ITloop 2894568Sgibbs 29013177Sgibbs and A,PHASE_MASK,SCSISIGI 29113690Sgibbs mov LASTPHASE,A 29213690Sgibbs mov SCSISIGO,A 2934568Sgibbs 2944568Sgibbs cmp ALLZEROS,A je p_dataout 29513177Sgibbs cmp A,P_DATAIN je p_datain 29613177Sgibbs cmp A,P_COMMAND je p_command 29713177Sgibbs cmp A,P_MESGOUT je p_mesgout 29813177Sgibbs cmp A,P_STATUS je p_status 29913177Sgibbs cmp A,P_MESGIN je p_mesgin 3004568Sgibbs 30113177Sgibbs mvi INTSTAT,BAD_PHASE /* unknown phase - signal driver */ 30215843Sgibbs jmp ITloop /* Try reading the bus again. */ 3034568Sgibbs 3044568Sgibbsp_dataout: 30513177Sgibbs mvi DMAPARAMS,0x7d /* 30613177Sgibbs * WIDEODD|SCSIEN|SDMAEN|HDMAEN| 30713177Sgibbs * DIRECTION|FIFORESET 30813177Sgibbs */ 3099928Sgibbs jmp data_phase_init 3104568Sgibbs 31113177Sgibbs/* 31213177Sgibbs * If we re-enter the data phase after going through another phase, the 31313177Sgibbs * STCNT may have been cleared, so restore it from the residual field. 31413177Sgibbs */ 3159928Sgibbsdata_phase_reinit: 31613690Sgibbs mov STCNT0,SCB_RESID_DCNT0 31713690Sgibbs mov STCNT1,SCB_RESID_DCNT1 31813690Sgibbs mov STCNT2,SCB_RESID_DCNT2 3199928Sgibbs jmp data_phase_loop 3204568Sgibbs 3219928Sgibbsp_datain: 32213177Sgibbs mvi DMAPARAMS,0x79 /* 32313177Sgibbs * WIDEODD|SCSIEN|SDMAEN|HDMAEN| 32413177Sgibbs * !DIRECTION|FIFORESET 32513177Sgibbs */ 3269928Sgibbsdata_phase_init: 3279928Sgibbs call assert 3285775Sgibbs 3299928Sgibbs test FLAGS, DPHASE jnz data_phase_reinit 3309928Sgibbs call sg_scb2ram 33113177Sgibbs or FLAGS, DPHASE /* We have seen a data phase */ 3324568Sgibbs 3339928Sgibbsdata_phase_loop: 33413177Sgibbs/* If we are the last SG block, don't set wideodd. */ 3359928Sgibbs cmp SG_COUNT,0x01 jne data_phase_wideodd 33613177Sgibbs and DMAPARAMS, 0xbf /* Turn off WIDEODD */ 3379928Sgibbsdata_phase_wideodd: 3389928Sgibbs mov DMAPARAMS call dma 3394568Sgibbs 34013177Sgibbs/* Exit if we had an underrun */ 34113177Sgibbs test SSTAT0,SDONE jz data_phase_finish /* underrun STCNT != 0 */ 3427532Sgibbs 34313177Sgibbs/* 34413177Sgibbs * Advance the scatter-gather pointers if needed 34513177Sgibbs */ 3469928Sgibbssg_advance: 34713177Sgibbs dec SG_COUNT /* one less segment to go */ 3484568Sgibbs 34913177Sgibbs test SG_COUNT, 0xff jz data_phase_finish /* Are we done? */ 3504568Sgibbs 35113177Sgibbs clr A /* add sizeof(struct scatter) */ 35213177Sgibbs add SG_NEXT0,SG_SIZEOF,SG_NEXT0 35313177Sgibbs adc SG_NEXT1,A,SG_NEXT1 3544568Sgibbs 35513177Sgibbs/* 35613177Sgibbs * Load a struct scatter and set up the data address and length. 35713177Sgibbs * If the working value of the SG count is nonzero, then 35813177Sgibbs * we need to load a new set of values. 35913177Sgibbs * 36015328Sgibbs * This, like all DMA's, assumes little-endian host data storage. 36113177Sgibbs */ 3629928Sgibbssg_load: 36313177Sgibbs clr HCNT2 36413177Sgibbs clr HCNT1 36513177Sgibbs mvi HCNT0,SG_SIZEOF 3664568Sgibbs 36713690Sgibbs mov HADDR0,SG_NEXT0 36813690Sgibbs mov HADDR1,SG_NEXT1 36913690Sgibbs mov HADDR2,SG_NEXT2 37013690Sgibbs mov HADDR3,SG_NEXT3 3714568Sgibbs 37213690Sgibbs or DFCNTRL,0xd /* HDMAEN|DIRECTION|FIFORESET */ 3739928Sgibbs 37413177Sgibbs/* 37513177Sgibbs * Wait for DMA from host memory to data FIFO to complete, then disable 37613177Sgibbs * DMA and wait for it to acknowledge that it's off. 37713177Sgibbs */ 37813690Sgibbsdma_finish: 37913690Sgibbs test DFSTATUS,HDONE jz dma_finish 38013690Sgibbs /* Turn off DMA preserving WIDEODD */ 38113690Sgibbs and DFCNTRL,WIDEODD 38213690Sgibbsdma_finish2: 38313690Sgibbs test DFCNTRL,HDMAENACK jnz dma_finish2 3849928Sgibbs 38513177Sgibbs/* 38613177Sgibbs * Copy data from FIFO into SCB data pointer and data count. This assumes 38713177Sgibbs * that the struct scatterlist has this structure (this and sizeof(struct 38814449Sgibbs * scatterlist) == 12 are asserted in aic7xxx.c for the Linux driver): 38913177Sgibbs * 39013177Sgibbs * struct scatterlist { 39113177Sgibbs * char *address; four bytes, little-endian order 39213177Sgibbs * ... four bytes, ignored 39313177Sgibbs * unsigned short length; two bytes, little-endian order 39413177Sgibbs * } 39513177Sgibbs * 39613177Sgibbs * 39714449Sgibbs * In FreeBSD, the scatter list entry is only 8 bytes. 39813177Sgibbs * 39913177Sgibbs * struct ahc_dma_seg { 40013177Sgibbs * physaddr addr; four bytes, little-endian order 40113177Sgibbs * long len; four bytes, little endian order 40213177Sgibbs * }; 40313177Sgibbs */ 4049928Sgibbs 40514449Sgibbs mov HADDR0,DFDAT 40614449Sgibbs mov HADDR1,DFDAT 40714449Sgibbs mov HADDR2,DFDAT 40814449Sgibbs mov HADDR3,DFDAT 40913177Sgibbs/* 41013177Sgibbs * For Linux, we must throw away four bytes since there is a 32bit gap 41114449Sgibbs * in the middle of a struct scatterlist. 41213177Sgibbs */ 41315709Sgibbs#ifdef __linux__ 41413177Sgibbs mov NONE,DFDAT 41513177Sgibbs mov NONE,DFDAT 41613177Sgibbs mov NONE,DFDAT 41713177Sgibbs mov NONE,DFDAT 41814449Sgibbs#endif 41913690Sgibbs mov HCNT0,DFDAT 42013690Sgibbs mov HCNT1,DFDAT 42113690Sgibbs mov HCNT2,DFDAT 4224568Sgibbs 42313177Sgibbs/* Load STCNT as well. It is a mirror of HCNT */ 42413690Sgibbs mov STCNT0,HCNT0 42513690Sgibbs mov STCNT1,HCNT1 42613690Sgibbs mov STCNT2,HCNT2 4279928Sgibbs test SSTAT1,PHASEMIS jz data_phase_loop 4284568Sgibbs 4299928Sgibbsdata_phase_finish: 43013177Sgibbs/* 43113177Sgibbs * After a DMA finishes, save the SG and STCNT residuals back into the SCB 43213177Sgibbs * We use STCNT instead of HCNT, since it's a reflection of how many bytes 43313177Sgibbs * were transferred on the SCSI (as opposed to the host) bus. 43413177Sgibbs */ 43513690Sgibbs mov SCB_RESID_DCNT0,STCNT0 43613690Sgibbs mov SCB_RESID_DCNT1,STCNT1 43713690Sgibbs mov SCB_RESID_DCNT2,STCNT2 43813177Sgibbs mov SCB_RESID_SGCNT, SG_COUNT 4394568Sgibbs jmp ITloop 4404568Sgibbs 44113177Sgibbs/* 44215328Sgibbs * Command phase. Set up the DMA registers and let 'er rip. 44313177Sgibbs */ 4444568Sgibbsp_command: 4454568Sgibbs call assert 4464568Sgibbs 44713177Sgibbs/* 44815328Sgibbs * Load HADDR and HCNT. 44913177Sgibbs */ 45013690Sgibbs mov HADDR0, SCB_CMDPTR0 45113690Sgibbs mov HADDR1, SCB_CMDPTR1 45213690Sgibbs mov HADDR2, SCB_CMDPTR2 45313690Sgibbs mov HADDR3, SCB_CMDPTR3 45413690Sgibbs mov HCNT0, SCB_CMDLEN 45513690Sgibbs clr HCNT1 45613690Sgibbs clr HCNT2 4574568Sgibbs 45813690Sgibbs mov STCNT0, HCNT0 45913690Sgibbs mov STCNT1, HCNT1 46013690Sgibbs mov STCNT2, HCNT2 4614568Sgibbs 4624568Sgibbs mvi 0x3d call dma # SCSIEN|SDMAEN|HDMAEN| 4634568Sgibbs # DIRECTION|FIFORESET 4644568Sgibbs jmp ITloop 4654568Sgibbs 46613177Sgibbs/* 46713177Sgibbs * Status phase. Wait for the data byte to appear, then read it 46813177Sgibbs * and store it into the SCB. 46913177Sgibbs */ 4704568Sgibbsp_status: 47113177Sgibbs mvi SCB_TARGET_STATUS call inb_first 4729954Sgibbs jmp mesgin_done 4734568Sgibbs 47413177Sgibbs/* 47515328Sgibbs * Message out phase. If there is not an active message, but the target 47613177Sgibbs * took us into this phase anyway, build a no-op message and send it. 47713177Sgibbs */ 4784568Sgibbsp_mesgout: 47913177Sgibbs test MSG_LEN, 0xff jnz p_mesgout_start 48013177Sgibbs mvi MSG_NOP call mk_mesg /* build NOP message */ 4814568Sgibbs 48213177Sgibbsp_mesgout_start: 48313177Sgibbs/* 48413177Sgibbs * Set up automatic PIO transfer from MSG0. Bit 3 in 48513177Sgibbs * SXFRCTL0 (SPIOEN) is already on. 48613177Sgibbs */ 48713177Sgibbs mvi SINDEX,MSG0 4884568Sgibbs mov DINDEX,MSG_LEN 4894568Sgibbs 49013177Sgibbs/* 49113177Sgibbs * When target asks for a byte, drop ATN if it's the last one in 49213177Sgibbs * the message. Otherwise, keep going until the message is exhausted. 49313177Sgibbs * 49413177Sgibbs * Keep an eye out for a phase change, in case the target issues 49513177Sgibbs * a MESSAGE REJECT. 49613177Sgibbs */ 49713177Sgibbsp_mesgout_loop: 49813313Sgibbs test SSTAT1,PHASEMIS jnz p_mesgout_phasemis 49913177Sgibbs test SSTAT0,SPIORDY jz p_mesgout_loop 50013177Sgibbs cmp DINDEX,1 jne p_mesgout_outb /* last byte? */ 50113177Sgibbs mvi CLRSINT1,CLRATNO /* drop ATN */ 50213177Sgibbsp_mesgout_outb: 50313177Sgibbs dec DINDEX 50413386Sgibbs or CLRSINT0, CLRSPIORDY 5054568Sgibbs mov SCSIDATL,SINDIR 50613313Sgibbs 5074568Sgibbsp_mesgout4: 50813177Sgibbs test DINDEX,0xff jnz p_mesgout_loop 5094568Sgibbs 51013177Sgibbs/* 51113177Sgibbs * If the next bus phase after ATN drops is a message out, it means 51213177Sgibbs * that the target is requesting that the last message(s) be resent. 51313177Sgibbs */ 51413177Sgibbsp_mesgout_snoop: 51513177Sgibbs test SSTAT1,BUSFREE jnz p_mesgout_done 51613177Sgibbs test SSTAT1,REQINIT jz p_mesgout_snoop 5174568Sgibbs 51813177Sgibbs test SSTAT1,PHASEMIS jnz p_mesgout_done 5194568Sgibbs 52013690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 52113177Sgibbs 5224568Sgibbs jmp ITloop 5234568Sgibbs 52413177Sgibbsp_mesgout_phasemis: 52515328Sgibbs mvi CLRSINT1,CLRATNO /* Be sure to turn ATNO off */ 52613177Sgibbsp_mesgout_done: 52713177Sgibbs clr MSG_LEN /* no active msg */ 5284568Sgibbs jmp ITloop 5294568Sgibbs 53013177Sgibbs/* 53113177Sgibbs * Message in phase. Bytes are read using Automatic PIO mode. 53213177Sgibbs */ 5334568Sgibbsp_mesgin: 53413177Sgibbs mvi A call inb_first /* read the 1st message byte */ 53513177Sgibbs mov REJBYTE,A /* save it for the driver */ 5364568Sgibbs 53713177Sgibbs test A,MSG_IDENTIFY jnz mesgin_identify 53813177Sgibbs cmp A,MSG_DISCONNECT je mesgin_disconnect 53913177Sgibbs cmp A,MSG_SDPTRS je mesgin_sdptrs 54013177Sgibbs cmp ALLZEROS,A je mesgin_complete 54113177Sgibbs cmp A,MSG_RDPTRS je mesgin_rdptrs 54213177Sgibbs cmp A,MSG_EXTENDED je mesgin_extended 54313177Sgibbs cmp A,MSG_REJECT je mesgin_reject 5444568Sgibbs 5459954Sgibbsrej_mesgin: 54613177Sgibbs/* 54713177Sgibbs * We have no idea what this message in is, and there's no way 54813177Sgibbs * to pass it up to the kernel, so we issue a message reject and 54913177Sgibbs * hope for the best. Since we're now using manual PIO mode to 55013177Sgibbs * read in the message, there should no longer be a race condition 55113177Sgibbs * present when we assert ATN. In any case, rejection should be a 55213177Sgibbs * rare occurrence - signal the driver when it happens. 55313177Sgibbs */ 55413690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 55513177Sgibbs mvi INTSTAT,SEND_REJECT /* let driver know */ 5569954Sgibbs 55713177Sgibbs mvi MSG_REJECT call mk_mesg 5589954Sgibbs 5599954Sgibbsmesgin_done: 56013177Sgibbs call inb_last /*ack & turn auto PIO back on*/ 5619954Sgibbs jmp ITloop 5629954Sgibbs 5639954Sgibbs 5649954Sgibbsmesgin_complete: 56513177Sgibbs/* 56615328Sgibbs * We got a "command complete" message, so put the SCB_TAG into QUEUEOUT, 56715328Sgibbs * and trigger a completion interrupt. Check status for non zero return 56815328Sgibbs * and interrupt driver if needed. This allows the driver to interpret 56915328Sgibbs * errors only when they occur instead of always uploading the scb. If 57015328Sgibbs * the status is SCSI_CHECK, the driver will download a new scb requesting 57115328Sgibbs * sense to replace the old one, modify the "waiting for selection" SCB list 57215328Sgibbs * and set RETURN_1 to SEND_SENSE. If RETURN_1 is set to SEND_SENSE the 57315328Sgibbs * sequencer imediately jumps to main loop where it will run down the waiting 57415328Sgibbs * SCB list and process the sense request. If the kernel driver does not 57515328Sgibbs * wish to request sense, it need only clear RETURN_1, and the command is 57615328Sgibbs * allowed to complete. We don't bother to post to the QOUTFIFO in the 57715328Sgibbs * error case since it would require extra work in the kernel driver to 57815328Sgibbs * ensure that the entry was removed before the command complete code tried 57915328Sgibbs * processing it. 58013177Sgibbs * 58113177Sgibbs * First check for residuals 58213177Sgibbs */ 58313177Sgibbs test SCB_RESID_SGCNT,0xff jz check_status 58413177Sgibbs/* 58513177Sgibbs * If we have a residual count, interrupt and tell the host. Other 58613177Sgibbs * alternatives are to pause the sequencer on all command completes (yuck), 58713177Sgibbs * dma the resid directly to the host (slick, we may have space to do it now) 58813177Sgibbs * or have the sequencer pause itself when it encounters a non-zero resid 58913177Sgibbs * (unecessary pause just to flag the command -yuck-, but takes one instruction 59013177Sgibbs * and since it shouldn't happen that often is good enough for our purposes). 59113177Sgibbs */ 59213177Sgibbsresid: 59313177Sgibbs mvi INTSTAT,RESIDUAL 5944568Sgibbs 5957532Sgibbscheck_status: 59613177Sgibbs test SCB_TARGET_STATUS,0xff jz status_ok /* Good Status? */ 59713177Sgibbs mvi INTSTAT,BAD_STATUS /* let driver know */ 59813177Sgibbs cmp RETURN_1, SEND_SENSE jne status_ok 5999954Sgibbs jmp mesgin_done 6005326Sgibbs 6014568Sgibbsstatus_ok: 60213177Sgibbs/* First, mark this target as free. */ 60313177Sgibbs test SCB_CONTROL,TAG_ENB jnz test_immediate /* 60413177Sgibbs * Tagged commands 60513177Sgibbs * don't busy the 60613177Sgibbs * target. 60713177Sgibbs */ 60813177Sgibbs mov FUNCTION1,SCB_TCL 6095326Sgibbs mov A,FUNCTION1 61013177Sgibbs test SCB_TCL,0x88 jz clear_a 6115326Sgibbs xor ACTIVE_B,A 61213177Sgibbs jmp test_immediate 6135326Sgibbs 6145326Sgibbsclear_a: 6155326Sgibbs xor ACTIVE_A,A 6165326Sgibbs 61713177Sgibbstest_immediate: 61813177Sgibbs test SCB_CMDLEN,0xff jnz complete /* Immediate message complete */ 61913177Sgibbs/* 62013177Sgibbs * Pause the sequencer until the driver gets around to handling the command 62113177Sgibbs * complete. This is so that any action that might require carefull timing 62213177Sgibbs * with the completion of this command can occur. 62313177Sgibbs */ 6249810Sgibbs mvi INTSTAT,IMMEDDONE 62513177Sgibbs jmp start 6265326Sgibbscomplete: 62715328Sgibbs mov QOUTFIFO,SCB_TAG 6287532Sgibbs mvi INTSTAT,CMDCMPLT 6299954Sgibbs jmp mesgin_done 6304568Sgibbs 6317532Sgibbs 63213177Sgibbs/* 63313177Sgibbs * Is it an extended message? We only support the synchronous and wide data 63413177Sgibbs * transfer request messages, which will probably be in response to 63513177Sgibbs * WDTR or SDTR message outs from us. If it's not SDTR or WDTR, reject it - 63613177Sgibbs * apparently this can be done after any message in byte, according 63713177Sgibbs * to the SCSI-2 spec. 63813177Sgibbs */ 6399954Sgibbsmesgin_extended: 64013177Sgibbs mvi ARG_1 call inb_next /* extended message length */ 64115328Sgibbs mvi REJBYTE_EXT call inb_next /* extended message code */ 6424568Sgibbs 64315328Sgibbs cmp REJBYTE_EXT,MSG_SDTR je p_mesginSDTR 64415328Sgibbs cmp REJBYTE_EXT,MSG_WDTR je p_mesginWDTR 6459954Sgibbs jmp rej_mesgin 6465562Sgibbs 6475562Sgibbsp_mesginWDTR: 64813177Sgibbs cmp ARG_1,2 jne rej_mesgin /* extended mesg length=2 */ 64913177Sgibbs mvi ARG_1 call inb_next /* Width of bus */ 65013177Sgibbs mvi INTSTAT,WDTR_MSG /* let driver know */ 65113177Sgibbs test RETURN_1,0xff jz mesgin_done /* Do we need to send WDTR? */ 65213177Sgibbs cmp RETURN_1,SEND_REJ je rej_mesgin /* 65313177Sgibbs * Bus width was too large 65413177Sgibbs * Reject it. 65513177Sgibbs */ 6565562Sgibbs 65713177Sgibbs/* We didn't initiate the wide negotiation, so we must respond to the request */ 65813177Sgibbs and RETURN_1,0x7f /* Clear the SEND_WDTR Flag */ 65913177Sgibbs mvi DINDEX,MSG0 66013177Sgibbs mvi MSG0 call mk_wdtr /* build WDTR message */ 66113690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 6629954Sgibbs jmp mesgin_done 6635562Sgibbs 6645562Sgibbsp_mesginSDTR: 66513177Sgibbs cmp ARG_1,3 jne rej_mesgin /* extended mesg length=3 */ 66613177Sgibbs mvi ARG_1 call inb_next /* xfer period */ 66713177Sgibbs mvi A call inb_next /* REQ/ACK offset */ 66813177Sgibbs mvi INTSTAT,SDTR_MSG /* call driver to convert */ 6694568Sgibbs 67013177Sgibbs test RETURN_1,0xff jz mesgin_done /* Do we need to mk_sdtr/rej */ 67113177Sgibbs cmp RETURN_1,SEND_REJ je rej_mesgin /* 67213177Sgibbs * Requested SDTR too small 67313177Sgibbs * Reject it. 67413177Sgibbs */ 67515328Sgibbs clr ARG_1 /* Use the scratch ram rate */ 67613177Sgibbs mvi DINDEX, MSG0 67713177Sgibbs mvi MSG0 call mk_sdtr 67813690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 6799954Sgibbs jmp mesgin_done 6804568Sgibbs 68113177Sgibbs/* 68213177Sgibbs * Is it a disconnect message? Set a flag in the SCB to remind us 68313177Sgibbs * and await the bus going free. 68413177Sgibbs */ 6859954Sgibbsmesgin_disconnect: 68613177Sgibbs or SCB_CONTROL,DISCONNECTED 68715328Sgibbs test FLAGS, PAGESCBS jz mesgin_done 68815328Sgibbs/* 68915328Sgibbs * Link this SCB into the DISCONNECTED list. This list holds the 69015328Sgibbs * candidates for paging out an SCB if one is needed for a new command. 69115328Sgibbs * Modifying the disconnected list is a critical(pause dissabled) section. 69215328Sgibbs */ 69315328Sgibbs mvi SCB_PREV, SCB_LIST_NULL 69415328Sgibbs mvi SEQCTL,0x50 /* PAUSEDIS|FASTMODE */ 69515328Sgibbs mov SCB_NEXT, DISCONNECTED_SCBH 69615328Sgibbs mov DISCONNECTED_SCBH, SCBPTR 69715328Sgibbs cmp SCB_NEXT,SCB_LIST_NULL je linkdone 69815328Sgibbs mov SCBPTR,SCB_NEXT 69915328Sgibbs mov SCB_PREV,DISCONNECTED_SCBH 70015328Sgibbs mov SCBPTR,DISCONNECTED_SCBH 70115328Sgibbslinkdone: 70215328Sgibbs mvi SEQCTL,0x10 /* !PAUSEDIS|FASTMODE */ 7039954Sgibbs jmp mesgin_done 7044568Sgibbs 70513177Sgibbs/* 70613177Sgibbs * Save data pointers message? Copy working values into the SCB, 70713177Sgibbs * usually in preparation for a disconnect. 70813177Sgibbs */ 7099954Sgibbsmesgin_sdptrs: 7104568Sgibbs call sg_ram2scb 7119954Sgibbs jmp mesgin_done 7124568Sgibbs 71313177Sgibbs/* 71413177Sgibbs * Restore pointers message? Data pointers are recopied from the 71513177Sgibbs * SCB anytime we enter a data phase for the first time, so all 71613177Sgibbs * we need to do is clear the DPHASE flag and let the data phase 71713177Sgibbs * code do the rest. 71813177Sgibbs */ 7199954Sgibbsmesgin_rdptrs: 72015328Sgibbs and FLAGS,0xef /* 72113177Sgibbs * !DPHASE we'll reload them 72213177Sgibbs * the next time through 72313177Sgibbs */ 7249954Sgibbs jmp mesgin_done 7254568Sgibbs 72613177Sgibbs/* 72713177Sgibbs * Identify message? For a reconnecting target, this tells us the lun 72813177Sgibbs * that the reconnection is for - find the correct SCB and switch to it, 72913177Sgibbs * clearing the "disconnected" bit so we don't "find" it by accident later. 73013177Sgibbs */ 7319954Sgibbsmesgin_identify: 73213177Sgibbs test A,0x78 jnz rej_mesgin /*!DiscPriv|!LUNTAR|!Reserved*/ 7334568Sgibbs 73413177Sgibbs and A,0x07 /* lun in lower three bits */ 7356608Sgibbs or SAVED_TCL,A,SELID 7366608Sgibbs and SAVED_TCL,0xf7 73713177Sgibbs and A,SELBUSB,SBLKCTL /* B Channel?? */ 7386608Sgibbs or SAVED_TCL,A 73913177Sgibbs call inb_last /* ACK */ 74013177Sgibbs 74113177Sgibbs/* 74213177Sgibbs * Here we "snoop" the bus looking for a SIMPLE QUEUE TAG message. 74315328Sgibbs * If we get one, we use the tag returned to switch to find the proper 74415328Sgibbs * SCB. With SCB paging, this requires using findSCB for both tagged 74515328Sgibbs * and non-tagged transactions since the SCB may exist in any slot. 74615328Sgibbs * If we're not using SCB paging, we can use the tag as the direct 74715328Sgibbs * index to the SCB. 74813177Sgibbs */ 74915328Sgibbs mvi ARG_1,SCB_LIST_NULL /* Default to no-tag */ 75013177Sgibbssnoop_tag_loop: 75113177Sgibbs test SSTAT1,BUSFREE jnz use_findSCB 75213177Sgibbs test SSTAT1,REQINIT jz snoop_tag_loop 75313177Sgibbs test SSTAT1,PHASEMIS jnz use_findSCB 75413177Sgibbs mvi A call inb_first 75515328Sgibbs cmp A,MSG_SIMPLE_TAG jne use_findSCB 7566608Sgibbsget_tag: 75713177Sgibbs mvi ARG_1 call inb_next /* tag value */ 75813177Sgibbs/* 75913177Sgibbs * See if the tag is in range. The tag is < SCBCOUNT if we add 76013177Sgibbs * the complement of SCBCOUNT to the incomming tag and there is 76113177Sgibbs * no carry. 76213177Sgibbs */ 76313177Sgibbs mov A,COMP_SCBCOUNT 76413177Sgibbs add SINDEX,A,ARG_1 76513177Sgibbs jc abort_tag 76613177Sgibbs 76713177Sgibbs/* 76815328Sgibbs * Ensure that the SCB the tag points to is for an SCB transaction 76913177Sgibbs * to the reconnecting target. 77013177Sgibbs */ 77115328Sgibbs test FLAGS, PAGESCBS jz index_by_tag 77215328Sgibbs call inb_last /* Ack Tag */ 77315328Sgibbsuse_findSCB: 77415328Sgibbs mov ALLZEROS call findSCB /* Have to search */ 77515328Sgibbssetup_SCB: 77615328Sgibbs and SCB_CONTROL,0xfb /* clear disconnect bit in SCB */ 77715328Sgibbs or FLAGS,IDENTIFY_SEEN /* make note of IDENTIFY */ 77815328Sgibbs jmp ITloop 77915328Sgibbsindex_by_tag: 78013177Sgibbs mov SCBPTR,ARG_1 7816608Sgibbs mov A,SAVED_TCL 78213177Sgibbs cmp SCB_TCL,A jne abort_tag 78313177Sgibbs test SCB_CONTROL,TAG_ENB jz abort_tag 78413177Sgibbs call inb_last /* Ack Successful tag */ 78513177Sgibbs jmp setup_SCB 78615328Sgibbs 7877700Sgibbsabort_tag: 78813690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 78913177Sgibbs mvi INTSTAT,ABORT_TAG /* let driver know */ 79015328Sgibbs mvi MSG_ABORT_TAG call mk_mesg /* ABORT TAG message */ 79113177Sgibbs jmp mesgin_done 7926608Sgibbs 79313177Sgibbs/* 79413177Sgibbs * Message reject? Let the kernel driver handle this. If we have an 79513177Sgibbs * outstanding WDTR or SDTR negotiation, assume that it's a response from 79613177Sgibbs * the target selecting 8bit or asynchronous transfer, otherwise just ignore 79713177Sgibbs * it since we have no clue what it pertains to. 79813177Sgibbs */ 7999954Sgibbsmesgin_reject: 80013177Sgibbs mvi INTSTAT, REJECT_MSG 8019954Sgibbs jmp mesgin_done 8025562Sgibbs 80313177Sgibbs/* 80413177Sgibbs * [ ADD MORE MESSAGE HANDLING HERE ] 80513177Sgibbs */ 8064568Sgibbs 80713177Sgibbs/* 80813177Sgibbs * Bus free phase. It might be useful to interrupt the device 80913177Sgibbs * driver if we aren't expecting this. For now, make sure that 81013177Sgibbs * ATN isn't being asserted and look for a new command. 81113177Sgibbs */ 8124568Sgibbsp_busfree: 81313177Sgibbs mvi CLRSINT1,CLRATNO 81414449Sgibbs clr LASTPHASE 8158567Sdg 81613177Sgibbs/* 81713177Sgibbs * if this is an immediate command, perform a psuedo command complete to 81813177Sgibbs * notify the driver. 81913177Sgibbs */ 82013177Sgibbs test SCB_CMDLEN,0xff jz status_ok 82113177Sgibbs jmp start 8224568Sgibbs 82313177Sgibbs/* 82413177Sgibbs * Locking the driver out, build a one-byte message passed in SINDEX 82513177Sgibbs * if there is no active message already. SINDEX is returned intact. 82613177Sgibbs */ 8274568Sgibbsmk_mesg: 82813177Sgibbs mvi SEQCTL,0x50 /* PAUSEDIS|FASTMODE */ 82913177Sgibbs test MSG_LEN,0xff jz mk_mesg1 /* Should always succeed */ 83013177Sgibbs 83113177Sgibbs /* 83213177Sgibbs * Hmmm. For some reason the mesg buffer is in use. 83313177Sgibbs * Tell the driver. It should look at SINDEX to find 83413177Sgibbs * out what we wanted to use the buffer for and resolve 83513177Sgibbs * the conflict. 83613177Sgibbs */ 83713177Sgibbs mvi SEQCTL,0x10 /* !PAUSEDIS|FASTMODE */ 83813690Sgibbs mvi INTSTAT,MSG_BUFFER_BUSY 8394568Sgibbs 8404568Sgibbsmk_mesg1: 84113177Sgibbs mvi MSG_LEN,1 /* length = 1 */ 84213177Sgibbs mov MSG0,SINDEX /* 1-byte message */ 84313177Sgibbs mvi SEQCTL,0x10 ret /* !PAUSEDIS|FASTMODE */ 8444568Sgibbs 84513177Sgibbs/* 84613177Sgibbs * Functions to read data in Automatic PIO mode. 84713177Sgibbs * 84813177Sgibbs * According to Adaptec's documentation, an ACK is not sent on input from 84913177Sgibbs * the target until SCSIDATL is read from. So we wait until SCSIDATL is 85013177Sgibbs * latched (the usual way), then read the data byte directly off the bus 85113177Sgibbs * using SCSIBUSL. When we have pulled the ATN line, or we just want to 85213177Sgibbs * acknowledge the byte, then we do a dummy read from SCISDATL. The SCSI 85313177Sgibbs * spec guarantees that the target will hold the data byte on the bus until 85413177Sgibbs * we send our ACK. 85513177Sgibbs * 85613177Sgibbs * The assumption here is that these are called in a particular sequence, 85713177Sgibbs * and that REQ is already set when inb_first is called. inb_{first,next} 85813177Sgibbs * use the same calling convention as inb. 85913177Sgibbs */ 86013177Sgibbs 86113177Sgibbsinb_next: 86213386Sgibbs or CLRSINT0, CLRSPIORDY 86313360Sgibbs mov NONE,SCSIDATL /*dummy read from latch to ACK*/ 86413360Sgibbsinb_next_wait: 86513360Sgibbs test SSTAT1,PHASEMIS jnz mesgin_phasemis 86613360Sgibbs test SSTAT0,SPIORDY jz inb_next_wait /* wait for next byte */ 86713313Sgibbsinb_first: 8684568Sgibbs mov DINDEX,SINDEX 86913177Sgibbs mov DINDIR,SCSIBUSL ret /*read byte directly from bus*/ 87013177Sgibbsinb_last: 87113360Sgibbs mov NONE,SCSIDATL ret /*dummy read from latch to ACK*/ 8724568Sgibbs 87313177Sgibbsmesgin_phasemis: 87413177Sgibbs/* 87513177Sgibbs * We expected to receive another byte, but the target changed phase 87613177Sgibbs */ 87713177Sgibbs mvi INTSTAT, MSGIN_PHASEMIS 87813177Sgibbs jmp ITloop 8794568Sgibbs 88013177Sgibbs/* 88113177Sgibbs * DMA data transfer. HADDR and HCNT must be loaded first, and 88213177Sgibbs * SINDEX should contain the value to load DFCNTRL with - 0x3d for 88313177Sgibbs * host->scsi, or 0x39 for scsi->host. The SCSI channel is cleared 88413177Sgibbs * during initialization. 88513177Sgibbs */ 8864568Sgibbsdma: 8874568Sgibbs mov DFCNTRL,SINDEX 8884568Sgibbsdma1: 88913177Sgibbs test SSTAT0,DMADONE jnz dma3 89013177Sgibbs test SSTAT1,PHASEMIS jz dma1 /* ie. underrun */ 8914568Sgibbs 89213177Sgibbs/* 89313177Sgibbs * We will be "done" DMAing when the transfer count goes to zero, or 89413177Sgibbs * the target changes the phase (in light of this, it makes sense that 89513177Sgibbs * the DMA circuitry doesn't ACK when PHASEMIS is active). If we are 89613177Sgibbs * doing a SCSI->Host transfer, the data FIFO should be flushed auto- 89713177Sgibbs * magically on STCNT=0 or a phase change, so just wait for FIFO empty 89813177Sgibbs * status. 89913177Sgibbs */ 9004568Sgibbsdma3: 90113177Sgibbs test SINDEX,DIRECTION jnz dma5 9024568Sgibbsdma4: 90313177Sgibbs test DFSTATUS,FIFOEMP jz dma4 9044568Sgibbs 90513177Sgibbs/* 90613177Sgibbs * Now shut the DMA enables off and make sure that the DMA enables are 90713177Sgibbs * actually off first lest we get an ILLSADDR. 90813177Sgibbs */ 9094568Sgibbsdma5: 91013177Sgibbs /* disable DMA, but maintain WIDEODD */ 91113690Sgibbs and DFCNTRL,WIDEODD 9124568Sgibbsdma6: 91313177Sgibbs test DFCNTRL,0x38 jnz dma6 /* SCSIENACK|SDMAENACK|HDMAENACK */ 9144568Sgibbs 9154568Sgibbs ret 9164568Sgibbs 91713177Sgibbs/* 91813177Sgibbs * Common SCSI initialization for selection and reselection. Expects 91913177Sgibbs * the target SCSI ID to be in the upper four bits of SINDEX, and A's 92013177Sgibbs * contents are stomped on return. 92113177Sgibbs */ 9228104Sgibbsinitialize_scsiid: 92313177Sgibbs and SINDEX,0xf0 /* Get target ID */ 9245775Sgibbs and A,0x0f,SCSIID 9255775Sgibbs or SINDEX,A 9268104Sgibbs mov SCSIID,SINDEX ret 9275326Sgibbs 92813177Sgibbs/* 92913177Sgibbs * Assert that if we've been reselected, then we've seen an IDENTIFY 93013177Sgibbs * message. 93113177Sgibbs */ 9324568Sgibbsassert: 93313177Sgibbs test FLAGS,RESELECTED jz return /* reselected? */ 93413177Sgibbs test FLAGS,IDENTIFY_SEEN jnz return /* seen IDENTIFY? */ 9354568Sgibbs 93613177Sgibbs mvi INTSTAT,NO_IDENT ret /* no - cause a kernel panic */ 9374568Sgibbs 93813177Sgibbs/* 93915328Sgibbs * Locate the SCB matching the target ID/channel/lun in SAVED_TCL, and the tag 94015328Sgibbs * value in ARG_1. If ARG_1 == SCB_LIST_NULL, we're looking for a non-tagged 94115328Sgibbs * SCB. Have the kernel print a warning message if it can't be found, and 94215328Sgibbs * generate an ABORT/ABORT_TAG message to the target. SINDEX should be 94313177Sgibbs * cleared on call. 94413177Sgibbs */ 9454568SgibbsfindSCB: 9466608Sgibbs mov A,SAVED_TCL 94715328Sgibbs mov SCBPTR,SINDEX /* switch to next SCB */ 94815328Sgibbs mvi SEQCTL,0x50 /* PAUSEDIS|FASTMODE */ 94913177Sgibbs cmp SCB_TCL,A jne findSCB1 /* target ID/channel/lun match? */ 95013177Sgibbs test SCB_CONTROL,DISCONNECTED jz findSCB1 /*should be disconnected*/ 95115328Sgibbs test SCB_CONTROL,TAG_ENB jnz findTaggedSCB 95215328Sgibbs cmp ARG_1,SCB_LIST_NULL je foundSCB 95315328Sgibbs jmp findSCB1 95415328SgibbsfindTaggedSCB: 95515328Sgibbs mov A, ARG_1 /* Tag passed in ARG_1 */ 95615328Sgibbs cmp SCB_TAG,A jne findSCB1 /* Found it? */ 95715328SgibbsfoundSCB: 95815328Sgibbs test FLAGS,PAGESCBS jz foundSCB_ret 95915328Sgibbs/* Remove this SCB from the disconnection list */ 96015328Sgibbs cmp SCB_NEXT,SCB_LIST_NULL je unlink_prev 96115328Sgibbs mov SAVED_LINKPTR, SCB_PREV 96215328Sgibbs mov SCBPTR, SCB_NEXT 96315328Sgibbs mov SCB_PREV, SAVED_LINKPTR 96415328Sgibbs mov SCBPTR, SINDEX 96515328Sgibbsunlink_prev: 96615328Sgibbs cmp SCB_PREV,SCB_LIST_NULL je rHead/* At the head of the list */ 96715328Sgibbs mov SAVED_LINKPTR, SCB_NEXT 96815328Sgibbs mov SCBPTR, SCB_PREV 96915328Sgibbs mov SCB_NEXT, SAVED_LINKPTR 97015328Sgibbs mov SCBPTR, SINDEX 97115328Sgibbs mvi SEQCTL,0x10 ret /* !PAUSEDIS|FASTMODE */ 97215328SgibbsrHead: 97315328Sgibbs mov DISCONNECTED_SCBH,SCB_NEXT 97415328SgibbsfoundSCB_ret: 97515328Sgibbs mvi SEQCTL,0x10 ret /* !PAUSEDIS|FASTMODE */ 9764568Sgibbs 9776608SgibbsfindSCB1: 97815328Sgibbs mvi SEQCTL,0x10 /* !PAUSEDIS|FASTMODE */ 9794568Sgibbs inc SINDEX 9804568Sgibbs mov A,SCBCOUNT 9816608Sgibbs cmp SINDEX,A jne findSCB 9824568Sgibbs 98313177Sgibbs mvi INTSTAT,NO_MATCH /* not found - signal kernel */ 98415328Sgibbs cmp RETURN_1,SCB_PAGEDIN je return 98515328Sgibbs or SCSISIGO,ATNO /* assert ATNO */ 98615328Sgibbs cmp ARG_1,SCB_LIST_NULL jne find_abort_tag 98715328Sgibbs mvi MSG_ABORT call mk_mesg 98815328Sgibbs jmp ITloop 98915328Sgibbsfind_abort_tag: 99015328Sgibbs mvi MSG_ABORT_TAG call mk_mesg 99115328Sgibbs jmp ITloop 9924568Sgibbs 99313177Sgibbs/* 99413177Sgibbs * Make a working copy of the scatter-gather parameters from the SCB. 99513177Sgibbs */ 9964568Sgibbssg_scb2ram: 99713690Sgibbs mov HADDR0, SCB_DATAPTR0 99813690Sgibbs mov HADDR1, SCB_DATAPTR1 99913690Sgibbs mov HADDR2, SCB_DATAPTR2 100013690Sgibbs mov HADDR3, SCB_DATAPTR3 100113690Sgibbs mov HCNT0, SCB_DATACNT0 100213690Sgibbs mov HCNT1, SCB_DATACNT1 100313690Sgibbs mov HCNT2, SCB_DATACNT2 10049928Sgibbs 100513690Sgibbs mov STCNT0, HCNT0 100613690Sgibbs mov STCNT1, HCNT1 100713690Sgibbs mov STCNT2, HCNT2 10089928Sgibbs 100913177Sgibbs mov SG_COUNT,SCB_SGCOUNT 10104568Sgibbs 101113690Sgibbs mov SG_NEXT0, SCB_SGPTR0 101213690Sgibbs mov SG_NEXT1, SCB_SGPTR1 101313690Sgibbs mov SG_NEXT2, SCB_SGPTR2 101413690Sgibbs mov SG_NEXT3, SCB_SGPTR3 ret 10154568Sgibbs 101613177Sgibbs/* 101713177Sgibbs * Copying RAM values back to SCB, for Save Data Pointers message, but 101813177Sgibbs * only if we've actually been into a data phase to change them. This 101913177Sgibbs * protects against bogus data in scratch ram and the residual counts 102013177Sgibbs * since they are only initialized when we go into data_in or data_out. 102113177Sgibbs */ 10224568Sgibbssg_ram2scb: 10239928Sgibbs test FLAGS, DPHASE jz return 102413177Sgibbs mov SCB_SGCOUNT,SG_COUNT 10254568Sgibbs 102613690Sgibbs mov SCB_SGPTR0,SG_NEXT0 102713690Sgibbs mov SCB_SGPTR1,SG_NEXT1 102813690Sgibbs mov SCB_SGPTR2,SG_NEXT2 102913690Sgibbs mov SCB_SGPTR3,SG_NEXT3 10309928Sgibbs 103113690Sgibbs mov SCB_DATAPTR0,SHADDR0 103213690Sgibbs mov SCB_DATAPTR1,SHADDR1 103313690Sgibbs mov SCB_DATAPTR2,SHADDR2 103413690Sgibbs mov SCB_DATAPTR3,SHADDR3 10354568Sgibbs 103613177Sgibbs/* 103713177Sgibbs * Use the residual number since STCNT is corrupted by any message transfer 103813177Sgibbs */ 103913690Sgibbs mov SCB_DATACNT0,SCB_RESID_DCNT0 104013690Sgibbs mov SCB_DATACNT1,SCB_RESID_DCNT1 104113690Sgibbs mov SCB_DATACNT2,SCB_RESID_DCNT2 ret 10424568Sgibbs 104313177Sgibbs/* 104413177Sgibbs * Add the array base TARG_SCRATCH to the target offset (the target address 104513177Sgibbs * is in SCSIID), and return the result in SINDEX. The accumulator 104613177Sgibbs * contains the 3->8 decoding of the target ID on return. 104713177Sgibbs */ 10485562Sgibbsndx_dtr: 10494568Sgibbs shr A,SCSIID,4 105013177Sgibbs test SBLKCTL,SELBUSB jz ndx_dtr_2 105113177Sgibbs or A,0x08 /* Channel B entries add 8 */ 10525562Sgibbsndx_dtr_2: 105313690Sgibbs add SINDEX,TARG_SCRATCH,A ret 10544568Sgibbs 105513177Sgibbs/* 105613177Sgibbs * If we need to negotiate transfer parameters, build the WDTR or SDTR message 105713177Sgibbs * starting at the address passed in SINDEX. DINDEX is modified on return. 105813177Sgibbs * The SCSI-II spec requires that Wide negotiation occur first and you can 105913177Sgibbs * only negotiat one or the other at a time otherwise in the event of a message 106013177Sgibbs * reject, you wouldn't be able to tell which message was the culpret. 106113177Sgibbs */ 10625562Sgibbsmk_dtr: 106313177Sgibbs test SCB_CONTROL,NEEDWDTR jnz mk_wdtr_16bit 106415328Sgibbs mvi ARG_1, MAXOFFSET /* Force an offset of 15 or 8 if WIDE */ 10654568Sgibbs 10667532Sgibbsmk_sdtr: 106713177Sgibbs mvi DINDIR,1 /* extended message */ 106813177Sgibbs mvi DINDIR,3 /* extended message length = 3 */ 106913177Sgibbs mvi DINDIR,1 /* SDTR code */ 10707532Sgibbs call sdtr_to_rate 107113177Sgibbs mov DINDIR,RETURN_1 /* REQ/ACK transfer period */ 107215328Sgibbs cmp ARG_1, MAXOFFSET je mk_sdtr_max_offset 107313177Sgibbs and DINDIR,0x0f,SINDIR /* Sync Offset */ 10747532Sgibbs 10757532Sgibbsmk_sdtr_done: 107613177Sgibbs add MSG_LEN,COMP_MSG0,DINDEX ret /* update message length */ 10777532Sgibbs 10788567Sdgmk_sdtr_max_offset: 107913177Sgibbs/* 108013177Sgibbs * We're initiating sync negotiation, so request the max offset we can (15 or 8) 108113177Sgibbs */ 108213177Sgibbs /* Talking to a WIDE device? */ 108313177Sgibbs test SCSIRATE, WIDEXFER jnz wmax_offset 10848567Sdg mvi DINDIR, MAX_OFFSET_8BIT 10857532Sgibbs jmp mk_sdtr_done 10867532Sgibbs 10878567Sdgwmax_offset: 108813177Sgibbs mvi DINDIR, MAX_OFFSET_16BIT 10898567Sdg jmp mk_sdtr_done 10908567Sdg 10915647Sgibbsmk_wdtr_16bit: 10925647Sgibbs mvi ARG_1,BUS_16_BIT 10935562Sgibbsmk_wdtr: 109413177Sgibbs mvi DINDIR,1 /* extended message */ 109513177Sgibbs mvi DINDIR,2 /* extended message length = 2 */ 109613177Sgibbs mvi DINDIR,3 /* WDTR code */ 109713177Sgibbs mov DINDIR,ARG_1 /* bus width */ 10985562Sgibbs 109913177Sgibbs add MSG_LEN,COMP_MSG0,DINDEX ret /* update message length */ 11005562Sgibbs 11015562Sgibbssdtr_to_rate: 110213177Sgibbs call ndx_dtr /* index scratch space for target */ 11035562Sgibbs shr A,SINDIR,0x4 110413177Sgibbs dec SINDEX /* Preserve SINDEX */ 11055562Sgibbs and A,0x7 11065562Sgibbs clr RETURN_1 11075562Sgibbssdtr_to_rate_loop: 11085562Sgibbs test A,0x0f jz sdtr_to_rate_done 110913177Sgibbs add RETURN_1,0x19 11105562Sgibbs dec A 11115562Sgibbs jmp sdtr_to_rate_loop 11125562Sgibbssdtr_to_rate_done: 11135562Sgibbs shr RETURN_1,0x2 111413177Sgibbs add RETURN_1,0x19 111511829Sgibbs test SXFRCTL0,ULTRAEN jz return 111611829Sgibbs shr RETURN_1,0x1 11177532Sgibbsreturn: 11187532Sgibbs ret 1119