aic7xxx.seq revision 15843
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 4215843SgibbsVERSION AIC7XXX_SEQ_VER "$Id: aic7xxx.seq,v 1.34 1996/05/10 16:11:01 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/* 25715843Sgibbs * Initialize Ultra mode setting. ndx_dtr has left our target mask 25815843Sgibbs * in A. 25915843Sgibbs */ 26015843Sgibbs and SINDEX,0xdf,SXFRCTL0 /* default to Ultra disabled */ 26115843Sgibbs test SCSIID, 0x80 jnz ultra_b /* Target ID > 7 */ 26215843Sgibbs test SBLKCTL, SELBUSB jnz ultra_b /* Second channel device */ 26315843Sgibbs test ULTRA_ENB,A jz set_sxfrctl0 26415843Sgibbs or SINDEX, ULTRAEN jmp set_sxfrctl0 26515843Sgibbsultra_b: 26615843Sgibbs test ULTRA_ENB_B,A jz set_sxfrctl0 26715843Sgibbs or SINDEX, ULTRAEN 26815843Sgibbs 26915843Sgibbsset_sxfrctl0: 27015843Sgibbs mov SXFRCTL0,SINDEX 27115843Sgibbs 27213177Sgibbs mvi SCSISEQ,ENAUTOATNP /* 27313177Sgibbs * ATN on parity errors 27413177Sgibbs * for "in" phases 27513177Sgibbs */ 27613177Sgibbs mvi CLRSINT1,CLRBUSFREE 27713177Sgibbs mvi CLRSINT0,0x60 /* CLRSELDI|CLRSELDO */ 27813177Sgibbs/* 27913177Sgibbs * Main loop for information transfer phases. If BSY is false, then 28013177Sgibbs * we have a bus free condition, expected or not. Otherwise, wait 28113177Sgibbs * for the target to assert REQ before checking MSG, C/D and I/O 28213177Sgibbs * for the bus phase. 28313177Sgibbs * 28413177Sgibbs */ 2854568SgibbsITloop: 28613177Sgibbs test SSTAT1,BUSFREE jnz p_busfree 28713177Sgibbs test SSTAT1,REQINIT jz ITloop 2884568Sgibbs 28913177Sgibbs and A,PHASE_MASK,SCSISIGI 29013690Sgibbs mov LASTPHASE,A 29113690Sgibbs mov SCSISIGO,A 2924568Sgibbs 2934568Sgibbs cmp ALLZEROS,A je p_dataout 29413177Sgibbs cmp A,P_DATAIN je p_datain 29513177Sgibbs cmp A,P_COMMAND je p_command 29613177Sgibbs cmp A,P_MESGOUT je p_mesgout 29713177Sgibbs cmp A,P_STATUS je p_status 29813177Sgibbs cmp A,P_MESGIN je p_mesgin 2994568Sgibbs 30013177Sgibbs mvi INTSTAT,BAD_PHASE /* unknown phase - signal driver */ 30115843Sgibbs jmp ITloop /* Try reading the bus again. */ 3024568Sgibbs 3034568Sgibbsp_dataout: 30413177Sgibbs mvi DMAPARAMS,0x7d /* 30513177Sgibbs * WIDEODD|SCSIEN|SDMAEN|HDMAEN| 30613177Sgibbs * DIRECTION|FIFORESET 30713177Sgibbs */ 3089928Sgibbs jmp data_phase_init 3094568Sgibbs 31013177Sgibbs/* 31113177Sgibbs * If we re-enter the data phase after going through another phase, the 31213177Sgibbs * STCNT may have been cleared, so restore it from the residual field. 31313177Sgibbs */ 3149928Sgibbsdata_phase_reinit: 31513690Sgibbs mov STCNT0,SCB_RESID_DCNT0 31613690Sgibbs mov STCNT1,SCB_RESID_DCNT1 31713690Sgibbs mov STCNT2,SCB_RESID_DCNT2 3189928Sgibbs jmp data_phase_loop 3194568Sgibbs 3209928Sgibbsp_datain: 32113177Sgibbs mvi DMAPARAMS,0x79 /* 32213177Sgibbs * WIDEODD|SCSIEN|SDMAEN|HDMAEN| 32313177Sgibbs * !DIRECTION|FIFORESET 32413177Sgibbs */ 3259928Sgibbsdata_phase_init: 3269928Sgibbs call assert 3275775Sgibbs 3289928Sgibbs test FLAGS, DPHASE jnz data_phase_reinit 3299928Sgibbs call sg_scb2ram 33013177Sgibbs or FLAGS, DPHASE /* We have seen a data phase */ 3314568Sgibbs 3329928Sgibbsdata_phase_loop: 33313177Sgibbs/* If we are the last SG block, don't set wideodd. */ 3349928Sgibbs cmp SG_COUNT,0x01 jne data_phase_wideodd 33513177Sgibbs and DMAPARAMS, 0xbf /* Turn off WIDEODD */ 3369928Sgibbsdata_phase_wideodd: 3379928Sgibbs mov DMAPARAMS call dma 3384568Sgibbs 33913177Sgibbs/* Exit if we had an underrun */ 34013177Sgibbs test SSTAT0,SDONE jz data_phase_finish /* underrun STCNT != 0 */ 3417532Sgibbs 34213177Sgibbs/* 34313177Sgibbs * Advance the scatter-gather pointers if needed 34413177Sgibbs */ 3459928Sgibbssg_advance: 34613177Sgibbs dec SG_COUNT /* one less segment to go */ 3474568Sgibbs 34813177Sgibbs test SG_COUNT, 0xff jz data_phase_finish /* Are we done? */ 3494568Sgibbs 35013177Sgibbs clr A /* add sizeof(struct scatter) */ 35113177Sgibbs add SG_NEXT0,SG_SIZEOF,SG_NEXT0 35213177Sgibbs adc SG_NEXT1,A,SG_NEXT1 3534568Sgibbs 35413177Sgibbs/* 35513177Sgibbs * Load a struct scatter and set up the data address and length. 35613177Sgibbs * If the working value of the SG count is nonzero, then 35713177Sgibbs * we need to load a new set of values. 35813177Sgibbs * 35915328Sgibbs * This, like all DMA's, assumes little-endian host data storage. 36013177Sgibbs */ 3619928Sgibbssg_load: 36213177Sgibbs clr HCNT2 36313177Sgibbs clr HCNT1 36413177Sgibbs mvi HCNT0,SG_SIZEOF 3654568Sgibbs 36613690Sgibbs mov HADDR0,SG_NEXT0 36713690Sgibbs mov HADDR1,SG_NEXT1 36813690Sgibbs mov HADDR2,SG_NEXT2 36913690Sgibbs mov HADDR3,SG_NEXT3 3704568Sgibbs 37113690Sgibbs or DFCNTRL,0xd /* HDMAEN|DIRECTION|FIFORESET */ 3729928Sgibbs 37313177Sgibbs/* 37413177Sgibbs * Wait for DMA from host memory to data FIFO to complete, then disable 37513177Sgibbs * DMA and wait for it to acknowledge that it's off. 37613177Sgibbs */ 37713690Sgibbsdma_finish: 37813690Sgibbs test DFSTATUS,HDONE jz dma_finish 37913690Sgibbs /* Turn off DMA preserving WIDEODD */ 38013690Sgibbs and DFCNTRL,WIDEODD 38113690Sgibbsdma_finish2: 38213690Sgibbs test DFCNTRL,HDMAENACK jnz dma_finish2 3839928Sgibbs 38413177Sgibbs/* 38513177Sgibbs * Copy data from FIFO into SCB data pointer and data count. This assumes 38613177Sgibbs * that the struct scatterlist has this structure (this and sizeof(struct 38714449Sgibbs * scatterlist) == 12 are asserted in aic7xxx.c for the Linux driver): 38813177Sgibbs * 38913177Sgibbs * struct scatterlist { 39013177Sgibbs * char *address; four bytes, little-endian order 39113177Sgibbs * ... four bytes, ignored 39213177Sgibbs * unsigned short length; two bytes, little-endian order 39313177Sgibbs * } 39413177Sgibbs * 39513177Sgibbs * 39614449Sgibbs * In FreeBSD, the scatter list entry is only 8 bytes. 39713177Sgibbs * 39813177Sgibbs * struct ahc_dma_seg { 39913177Sgibbs * physaddr addr; four bytes, little-endian order 40013177Sgibbs * long len; four bytes, little endian order 40113177Sgibbs * }; 40213177Sgibbs */ 4039928Sgibbs 40414449Sgibbs mov HADDR0,DFDAT 40514449Sgibbs mov HADDR1,DFDAT 40614449Sgibbs mov HADDR2,DFDAT 40714449Sgibbs mov HADDR3,DFDAT 40813177Sgibbs/* 40913177Sgibbs * For Linux, we must throw away four bytes since there is a 32bit gap 41014449Sgibbs * in the middle of a struct scatterlist. 41113177Sgibbs */ 41215709Sgibbs#ifdef __linux__ 41313177Sgibbs mov NONE,DFDAT 41413177Sgibbs mov NONE,DFDAT 41513177Sgibbs mov NONE,DFDAT 41613177Sgibbs mov NONE,DFDAT 41714449Sgibbs#endif 41813690Sgibbs mov HCNT0,DFDAT 41913690Sgibbs mov HCNT1,DFDAT 42013690Sgibbs mov HCNT2,DFDAT 4214568Sgibbs 42213177Sgibbs/* Load STCNT as well. It is a mirror of HCNT */ 42313690Sgibbs mov STCNT0,HCNT0 42413690Sgibbs mov STCNT1,HCNT1 42513690Sgibbs mov STCNT2,HCNT2 4269928Sgibbs test SSTAT1,PHASEMIS jz data_phase_loop 4274568Sgibbs 4289928Sgibbsdata_phase_finish: 42913177Sgibbs/* 43013177Sgibbs * After a DMA finishes, save the SG and STCNT residuals back into the SCB 43113177Sgibbs * We use STCNT instead of HCNT, since it's a reflection of how many bytes 43213177Sgibbs * were transferred on the SCSI (as opposed to the host) bus. 43313177Sgibbs */ 43413690Sgibbs mov SCB_RESID_DCNT0,STCNT0 43513690Sgibbs mov SCB_RESID_DCNT1,STCNT1 43613690Sgibbs mov SCB_RESID_DCNT2,STCNT2 43713177Sgibbs mov SCB_RESID_SGCNT, SG_COUNT 4384568Sgibbs jmp ITloop 4394568Sgibbs 44013177Sgibbs/* 44115328Sgibbs * Command phase. Set up the DMA registers and let 'er rip. 44213177Sgibbs */ 4434568Sgibbsp_command: 4444568Sgibbs call assert 4454568Sgibbs 44613177Sgibbs/* 44715328Sgibbs * Load HADDR and HCNT. 44813177Sgibbs */ 44913690Sgibbs mov HADDR0, SCB_CMDPTR0 45013690Sgibbs mov HADDR1, SCB_CMDPTR1 45113690Sgibbs mov HADDR2, SCB_CMDPTR2 45213690Sgibbs mov HADDR3, SCB_CMDPTR3 45313690Sgibbs mov HCNT0, SCB_CMDLEN 45413690Sgibbs clr HCNT1 45513690Sgibbs clr HCNT2 4564568Sgibbs 45713690Sgibbs mov STCNT0, HCNT0 45813690Sgibbs mov STCNT1, HCNT1 45913690Sgibbs mov STCNT2, HCNT2 4604568Sgibbs 4614568Sgibbs mvi 0x3d call dma # SCSIEN|SDMAEN|HDMAEN| 4624568Sgibbs # DIRECTION|FIFORESET 4634568Sgibbs jmp ITloop 4644568Sgibbs 46513177Sgibbs/* 46613177Sgibbs * Status phase. Wait for the data byte to appear, then read it 46713177Sgibbs * and store it into the SCB. 46813177Sgibbs */ 4694568Sgibbsp_status: 47013177Sgibbs mvi SCB_TARGET_STATUS call inb_first 4719954Sgibbs jmp mesgin_done 4724568Sgibbs 47313177Sgibbs/* 47415328Sgibbs * Message out phase. If there is not an active message, but the target 47513177Sgibbs * took us into this phase anyway, build a no-op message and send it. 47613177Sgibbs */ 4774568Sgibbsp_mesgout: 47813177Sgibbs test MSG_LEN, 0xff jnz p_mesgout_start 47913177Sgibbs mvi MSG_NOP call mk_mesg /* build NOP message */ 4804568Sgibbs 48113177Sgibbsp_mesgout_start: 48213177Sgibbs/* 48313177Sgibbs * Set up automatic PIO transfer from MSG0. Bit 3 in 48413177Sgibbs * SXFRCTL0 (SPIOEN) is already on. 48513177Sgibbs */ 48613177Sgibbs mvi SINDEX,MSG0 4874568Sgibbs mov DINDEX,MSG_LEN 4884568Sgibbs 48913177Sgibbs/* 49013177Sgibbs * When target asks for a byte, drop ATN if it's the last one in 49113177Sgibbs * the message. Otherwise, keep going until the message is exhausted. 49213177Sgibbs * 49313177Sgibbs * Keep an eye out for a phase change, in case the target issues 49413177Sgibbs * a MESSAGE REJECT. 49513177Sgibbs */ 49613177Sgibbsp_mesgout_loop: 49713313Sgibbs test SSTAT1,PHASEMIS jnz p_mesgout_phasemis 49813177Sgibbs test SSTAT0,SPIORDY jz p_mesgout_loop 49913177Sgibbs cmp DINDEX,1 jne p_mesgout_outb /* last byte? */ 50013177Sgibbs mvi CLRSINT1,CLRATNO /* drop ATN */ 50113177Sgibbsp_mesgout_outb: 50213177Sgibbs dec DINDEX 50313386Sgibbs or CLRSINT0, CLRSPIORDY 5044568Sgibbs mov SCSIDATL,SINDIR 50513313Sgibbs 5064568Sgibbsp_mesgout4: 50713177Sgibbs test DINDEX,0xff jnz p_mesgout_loop 5084568Sgibbs 50913177Sgibbs/* 51013177Sgibbs * If the next bus phase after ATN drops is a message out, it means 51113177Sgibbs * that the target is requesting that the last message(s) be resent. 51213177Sgibbs */ 51313177Sgibbsp_mesgout_snoop: 51413177Sgibbs test SSTAT1,BUSFREE jnz p_mesgout_done 51513177Sgibbs test SSTAT1,REQINIT jz p_mesgout_snoop 5164568Sgibbs 51713177Sgibbs test SSTAT1,PHASEMIS jnz p_mesgout_done 5184568Sgibbs 51913690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 52013177Sgibbs 5214568Sgibbs jmp ITloop 5224568Sgibbs 52313177Sgibbsp_mesgout_phasemis: 52415328Sgibbs mvi CLRSINT1,CLRATNO /* Be sure to turn ATNO off */ 52513177Sgibbsp_mesgout_done: 52613177Sgibbs clr MSG_LEN /* no active msg */ 5274568Sgibbs jmp ITloop 5284568Sgibbs 52913177Sgibbs/* 53013177Sgibbs * Message in phase. Bytes are read using Automatic PIO mode. 53113177Sgibbs */ 5324568Sgibbsp_mesgin: 53313177Sgibbs mvi A call inb_first /* read the 1st message byte */ 53413177Sgibbs mov REJBYTE,A /* save it for the driver */ 5354568Sgibbs 53613177Sgibbs test A,MSG_IDENTIFY jnz mesgin_identify 53713177Sgibbs cmp A,MSG_DISCONNECT je mesgin_disconnect 53813177Sgibbs cmp A,MSG_SDPTRS je mesgin_sdptrs 53913177Sgibbs cmp ALLZEROS,A je mesgin_complete 54013177Sgibbs cmp A,MSG_RDPTRS je mesgin_rdptrs 54113177Sgibbs cmp A,MSG_EXTENDED je mesgin_extended 54213177Sgibbs cmp A,MSG_REJECT je mesgin_reject 5434568Sgibbs 5449954Sgibbsrej_mesgin: 54513177Sgibbs/* 54613177Sgibbs * We have no idea what this message in is, and there's no way 54713177Sgibbs * to pass it up to the kernel, so we issue a message reject and 54813177Sgibbs * hope for the best. Since we're now using manual PIO mode to 54913177Sgibbs * read in the message, there should no longer be a race condition 55013177Sgibbs * present when we assert ATN. In any case, rejection should be a 55113177Sgibbs * rare occurrence - signal the driver when it happens. 55213177Sgibbs */ 55313690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 55413177Sgibbs mvi INTSTAT,SEND_REJECT /* let driver know */ 5559954Sgibbs 55613177Sgibbs mvi MSG_REJECT call mk_mesg 5579954Sgibbs 5589954Sgibbsmesgin_done: 55913177Sgibbs call inb_last /*ack & turn auto PIO back on*/ 5609954Sgibbs jmp ITloop 5619954Sgibbs 5629954Sgibbs 5639954Sgibbsmesgin_complete: 56413177Sgibbs/* 56515328Sgibbs * We got a "command complete" message, so put the SCB_TAG into QUEUEOUT, 56615328Sgibbs * and trigger a completion interrupt. Check status for non zero return 56715328Sgibbs * and interrupt driver if needed. This allows the driver to interpret 56815328Sgibbs * errors only when they occur instead of always uploading the scb. If 56915328Sgibbs * the status is SCSI_CHECK, the driver will download a new scb requesting 57015328Sgibbs * sense to replace the old one, modify the "waiting for selection" SCB list 57115328Sgibbs * and set RETURN_1 to SEND_SENSE. If RETURN_1 is set to SEND_SENSE the 57215328Sgibbs * sequencer imediately jumps to main loop where it will run down the waiting 57315328Sgibbs * SCB list and process the sense request. If the kernel driver does not 57415328Sgibbs * wish to request sense, it need only clear RETURN_1, and the command is 57515328Sgibbs * allowed to complete. We don't bother to post to the QOUTFIFO in the 57615328Sgibbs * error case since it would require extra work in the kernel driver to 57715328Sgibbs * ensure that the entry was removed before the command complete code tried 57815328Sgibbs * processing it. 57913177Sgibbs * 58013177Sgibbs * First check for residuals 58113177Sgibbs */ 58213177Sgibbs test SCB_RESID_SGCNT,0xff jz check_status 58313177Sgibbs/* 58413177Sgibbs * If we have a residual count, interrupt and tell the host. Other 58513177Sgibbs * alternatives are to pause the sequencer on all command completes (yuck), 58613177Sgibbs * dma the resid directly to the host (slick, we may have space to do it now) 58713177Sgibbs * or have the sequencer pause itself when it encounters a non-zero resid 58813177Sgibbs * (unecessary pause just to flag the command -yuck-, but takes one instruction 58913177Sgibbs * and since it shouldn't happen that often is good enough for our purposes). 59013177Sgibbs */ 59113177Sgibbsresid: 59213177Sgibbs mvi INTSTAT,RESIDUAL 5934568Sgibbs 5947532Sgibbscheck_status: 59513177Sgibbs test SCB_TARGET_STATUS,0xff jz status_ok /* Good Status? */ 59613177Sgibbs mvi INTSTAT,BAD_STATUS /* let driver know */ 59713177Sgibbs cmp RETURN_1, SEND_SENSE jne status_ok 5989954Sgibbs jmp mesgin_done 5995326Sgibbs 6004568Sgibbsstatus_ok: 60113177Sgibbs/* First, mark this target as free. */ 60213177Sgibbs test SCB_CONTROL,TAG_ENB jnz test_immediate /* 60313177Sgibbs * Tagged commands 60413177Sgibbs * don't busy the 60513177Sgibbs * target. 60613177Sgibbs */ 60713177Sgibbs mov FUNCTION1,SCB_TCL 6085326Sgibbs mov A,FUNCTION1 60913177Sgibbs test SCB_TCL,0x88 jz clear_a 6105326Sgibbs xor ACTIVE_B,A 61113177Sgibbs jmp test_immediate 6125326Sgibbs 6135326Sgibbsclear_a: 6145326Sgibbs xor ACTIVE_A,A 6155326Sgibbs 61613177Sgibbstest_immediate: 61713177Sgibbs test SCB_CMDLEN,0xff jnz complete /* Immediate message complete */ 61813177Sgibbs/* 61913177Sgibbs * Pause the sequencer until the driver gets around to handling the command 62013177Sgibbs * complete. This is so that any action that might require carefull timing 62113177Sgibbs * with the completion of this command can occur. 62213177Sgibbs */ 6239810Sgibbs mvi INTSTAT,IMMEDDONE 62413177Sgibbs jmp start 6255326Sgibbscomplete: 62615328Sgibbs mov QOUTFIFO,SCB_TAG 6277532Sgibbs mvi INTSTAT,CMDCMPLT 6289954Sgibbs jmp mesgin_done 6294568Sgibbs 6307532Sgibbs 63113177Sgibbs/* 63213177Sgibbs * Is it an extended message? We only support the synchronous and wide data 63313177Sgibbs * transfer request messages, which will probably be in response to 63413177Sgibbs * WDTR or SDTR message outs from us. If it's not SDTR or WDTR, reject it - 63513177Sgibbs * apparently this can be done after any message in byte, according 63613177Sgibbs * to the SCSI-2 spec. 63713177Sgibbs */ 6389954Sgibbsmesgin_extended: 63913177Sgibbs mvi ARG_1 call inb_next /* extended message length */ 64015328Sgibbs mvi REJBYTE_EXT call inb_next /* extended message code */ 6414568Sgibbs 64215328Sgibbs cmp REJBYTE_EXT,MSG_SDTR je p_mesginSDTR 64315328Sgibbs cmp REJBYTE_EXT,MSG_WDTR je p_mesginWDTR 6449954Sgibbs jmp rej_mesgin 6455562Sgibbs 6465562Sgibbsp_mesginWDTR: 64713177Sgibbs cmp ARG_1,2 jne rej_mesgin /* extended mesg length=2 */ 64813177Sgibbs mvi ARG_1 call inb_next /* Width of bus */ 64913177Sgibbs mvi INTSTAT,WDTR_MSG /* let driver know */ 65013177Sgibbs test RETURN_1,0xff jz mesgin_done /* Do we need to send WDTR? */ 65113177Sgibbs cmp RETURN_1,SEND_REJ je rej_mesgin /* 65213177Sgibbs * Bus width was too large 65313177Sgibbs * Reject it. 65413177Sgibbs */ 6555562Sgibbs 65613177Sgibbs/* We didn't initiate the wide negotiation, so we must respond to the request */ 65713177Sgibbs and RETURN_1,0x7f /* Clear the SEND_WDTR Flag */ 65813177Sgibbs mvi DINDEX,MSG0 65913177Sgibbs mvi MSG0 call mk_wdtr /* build WDTR message */ 66013690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 6619954Sgibbs jmp mesgin_done 6625562Sgibbs 6635562Sgibbsp_mesginSDTR: 66413177Sgibbs cmp ARG_1,3 jne rej_mesgin /* extended mesg length=3 */ 66513177Sgibbs mvi ARG_1 call inb_next /* xfer period */ 66613177Sgibbs mvi A call inb_next /* REQ/ACK offset */ 66713177Sgibbs mvi INTSTAT,SDTR_MSG /* call driver to convert */ 6684568Sgibbs 66913177Sgibbs test RETURN_1,0xff jz mesgin_done /* Do we need to mk_sdtr/rej */ 67013177Sgibbs cmp RETURN_1,SEND_REJ je rej_mesgin /* 67113177Sgibbs * Requested SDTR too small 67213177Sgibbs * Reject it. 67313177Sgibbs */ 67415328Sgibbs clr ARG_1 /* Use the scratch ram rate */ 67513177Sgibbs mvi DINDEX, MSG0 67613177Sgibbs mvi MSG0 call mk_sdtr 67713690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 6789954Sgibbs jmp mesgin_done 6794568Sgibbs 68013177Sgibbs/* 68113177Sgibbs * Is it a disconnect message? Set a flag in the SCB to remind us 68213177Sgibbs * and await the bus going free. 68313177Sgibbs */ 6849954Sgibbsmesgin_disconnect: 68513177Sgibbs or SCB_CONTROL,DISCONNECTED 68615328Sgibbs test FLAGS, PAGESCBS jz mesgin_done 68715328Sgibbs/* 68815328Sgibbs * Link this SCB into the DISCONNECTED list. This list holds the 68915328Sgibbs * candidates for paging out an SCB if one is needed for a new command. 69015328Sgibbs * Modifying the disconnected list is a critical(pause dissabled) section. 69115328Sgibbs */ 69215328Sgibbs mvi SCB_PREV, SCB_LIST_NULL 69315328Sgibbs mvi SEQCTL,0x50 /* PAUSEDIS|FASTMODE */ 69415328Sgibbs mov SCB_NEXT, DISCONNECTED_SCBH 69515328Sgibbs mov DISCONNECTED_SCBH, SCBPTR 69615328Sgibbs cmp SCB_NEXT,SCB_LIST_NULL je linkdone 69715328Sgibbs mov SCBPTR,SCB_NEXT 69815328Sgibbs mov SCB_PREV,DISCONNECTED_SCBH 69915328Sgibbs mov SCBPTR,DISCONNECTED_SCBH 70015328Sgibbslinkdone: 70115328Sgibbs mvi SEQCTL,0x10 /* !PAUSEDIS|FASTMODE */ 7029954Sgibbs jmp mesgin_done 7034568Sgibbs 70413177Sgibbs/* 70513177Sgibbs * Save data pointers message? Copy working values into the SCB, 70613177Sgibbs * usually in preparation for a disconnect. 70713177Sgibbs */ 7089954Sgibbsmesgin_sdptrs: 7094568Sgibbs call sg_ram2scb 7109954Sgibbs jmp mesgin_done 7114568Sgibbs 71213177Sgibbs/* 71313177Sgibbs * Restore pointers message? Data pointers are recopied from the 71413177Sgibbs * SCB anytime we enter a data phase for the first time, so all 71513177Sgibbs * we need to do is clear the DPHASE flag and let the data phase 71613177Sgibbs * code do the rest. 71713177Sgibbs */ 7189954Sgibbsmesgin_rdptrs: 71915328Sgibbs and FLAGS,0xef /* 72013177Sgibbs * !DPHASE we'll reload them 72113177Sgibbs * the next time through 72213177Sgibbs */ 7239954Sgibbs jmp mesgin_done 7244568Sgibbs 72513177Sgibbs/* 72613177Sgibbs * Identify message? For a reconnecting target, this tells us the lun 72713177Sgibbs * that the reconnection is for - find the correct SCB and switch to it, 72813177Sgibbs * clearing the "disconnected" bit so we don't "find" it by accident later. 72913177Sgibbs */ 7309954Sgibbsmesgin_identify: 73113177Sgibbs test A,0x78 jnz rej_mesgin /*!DiscPriv|!LUNTAR|!Reserved*/ 7324568Sgibbs 73313177Sgibbs and A,0x07 /* lun in lower three bits */ 7346608Sgibbs or SAVED_TCL,A,SELID 7356608Sgibbs and SAVED_TCL,0xf7 73613177Sgibbs and A,SELBUSB,SBLKCTL /* B Channel?? */ 7376608Sgibbs or SAVED_TCL,A 73813177Sgibbs call inb_last /* ACK */ 73913177Sgibbs 74013177Sgibbs/* 74113177Sgibbs * Here we "snoop" the bus looking for a SIMPLE QUEUE TAG message. 74215328Sgibbs * If we get one, we use the tag returned to switch to find the proper 74315328Sgibbs * SCB. With SCB paging, this requires using findSCB for both tagged 74415328Sgibbs * and non-tagged transactions since the SCB may exist in any slot. 74515328Sgibbs * If we're not using SCB paging, we can use the tag as the direct 74615328Sgibbs * index to the SCB. 74713177Sgibbs */ 74815328Sgibbs mvi ARG_1,SCB_LIST_NULL /* Default to no-tag */ 74913177Sgibbssnoop_tag_loop: 75013177Sgibbs test SSTAT1,BUSFREE jnz use_findSCB 75113177Sgibbs test SSTAT1,REQINIT jz snoop_tag_loop 75213177Sgibbs test SSTAT1,PHASEMIS jnz use_findSCB 75313177Sgibbs mvi A call inb_first 75415328Sgibbs cmp A,MSG_SIMPLE_TAG jne use_findSCB 7556608Sgibbsget_tag: 75613177Sgibbs mvi ARG_1 call inb_next /* tag value */ 75713177Sgibbs/* 75813177Sgibbs * See if the tag is in range. The tag is < SCBCOUNT if we add 75913177Sgibbs * the complement of SCBCOUNT to the incomming tag and there is 76013177Sgibbs * no carry. 76113177Sgibbs */ 76213177Sgibbs mov A,COMP_SCBCOUNT 76313177Sgibbs add SINDEX,A,ARG_1 76413177Sgibbs jc abort_tag 76513177Sgibbs 76613177Sgibbs/* 76715328Sgibbs * Ensure that the SCB the tag points to is for an SCB transaction 76813177Sgibbs * to the reconnecting target. 76913177Sgibbs */ 77015328Sgibbs test FLAGS, PAGESCBS jz index_by_tag 77115328Sgibbs call inb_last /* Ack Tag */ 77215328Sgibbsuse_findSCB: 77315328Sgibbs mov ALLZEROS call findSCB /* Have to search */ 77415328Sgibbssetup_SCB: 77515328Sgibbs and SCB_CONTROL,0xfb /* clear disconnect bit in SCB */ 77615328Sgibbs or FLAGS,IDENTIFY_SEEN /* make note of IDENTIFY */ 77715328Sgibbs jmp ITloop 77815328Sgibbsindex_by_tag: 77913177Sgibbs mov SCBPTR,ARG_1 7806608Sgibbs mov A,SAVED_TCL 78113177Sgibbs cmp SCB_TCL,A jne abort_tag 78213177Sgibbs test SCB_CONTROL,TAG_ENB jz abort_tag 78313177Sgibbs call inb_last /* Ack Successful tag */ 78413177Sgibbs jmp setup_SCB 78515328Sgibbs 7867700Sgibbsabort_tag: 78713690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 78813177Sgibbs mvi INTSTAT,ABORT_TAG /* let driver know */ 78915328Sgibbs mvi MSG_ABORT_TAG call mk_mesg /* ABORT TAG message */ 79013177Sgibbs jmp mesgin_done 7916608Sgibbs 79213177Sgibbs/* 79313177Sgibbs * Message reject? Let the kernel driver handle this. If we have an 79413177Sgibbs * outstanding WDTR or SDTR negotiation, assume that it's a response from 79513177Sgibbs * the target selecting 8bit or asynchronous transfer, otherwise just ignore 79613177Sgibbs * it since we have no clue what it pertains to. 79713177Sgibbs */ 7989954Sgibbsmesgin_reject: 79913177Sgibbs mvi INTSTAT, REJECT_MSG 8009954Sgibbs jmp mesgin_done 8015562Sgibbs 80213177Sgibbs/* 80313177Sgibbs * [ ADD MORE MESSAGE HANDLING HERE ] 80413177Sgibbs */ 8054568Sgibbs 80613177Sgibbs/* 80713177Sgibbs * Bus free phase. It might be useful to interrupt the device 80813177Sgibbs * driver if we aren't expecting this. For now, make sure that 80913177Sgibbs * ATN isn't being asserted and look for a new command. 81013177Sgibbs */ 8114568Sgibbsp_busfree: 81213177Sgibbs mvi CLRSINT1,CLRATNO 81314449Sgibbs clr LASTPHASE 8148567Sdg 81513177Sgibbs/* 81613177Sgibbs * if this is an immediate command, perform a psuedo command complete to 81713177Sgibbs * notify the driver. 81813177Sgibbs */ 81913177Sgibbs test SCB_CMDLEN,0xff jz status_ok 82013177Sgibbs jmp start 8214568Sgibbs 82213177Sgibbs/* 82313177Sgibbs * Locking the driver out, build a one-byte message passed in SINDEX 82413177Sgibbs * if there is no active message already. SINDEX is returned intact. 82513177Sgibbs */ 8264568Sgibbsmk_mesg: 82713177Sgibbs mvi SEQCTL,0x50 /* PAUSEDIS|FASTMODE */ 82813177Sgibbs test MSG_LEN,0xff jz mk_mesg1 /* Should always succeed */ 82913177Sgibbs 83013177Sgibbs /* 83113177Sgibbs * Hmmm. For some reason the mesg buffer is in use. 83213177Sgibbs * Tell the driver. It should look at SINDEX to find 83313177Sgibbs * out what we wanted to use the buffer for and resolve 83413177Sgibbs * the conflict. 83513177Sgibbs */ 83613177Sgibbs mvi SEQCTL,0x10 /* !PAUSEDIS|FASTMODE */ 83713690Sgibbs mvi INTSTAT,MSG_BUFFER_BUSY 8384568Sgibbs 8394568Sgibbsmk_mesg1: 84013177Sgibbs mvi MSG_LEN,1 /* length = 1 */ 84113177Sgibbs mov MSG0,SINDEX /* 1-byte message */ 84213177Sgibbs mvi SEQCTL,0x10 ret /* !PAUSEDIS|FASTMODE */ 8434568Sgibbs 84413177Sgibbs/* 84513177Sgibbs * Functions to read data in Automatic PIO mode. 84613177Sgibbs * 84713177Sgibbs * According to Adaptec's documentation, an ACK is not sent on input from 84813177Sgibbs * the target until SCSIDATL is read from. So we wait until SCSIDATL is 84913177Sgibbs * latched (the usual way), then read the data byte directly off the bus 85013177Sgibbs * using SCSIBUSL. When we have pulled the ATN line, or we just want to 85113177Sgibbs * acknowledge the byte, then we do a dummy read from SCISDATL. The SCSI 85213177Sgibbs * spec guarantees that the target will hold the data byte on the bus until 85313177Sgibbs * we send our ACK. 85413177Sgibbs * 85513177Sgibbs * The assumption here is that these are called in a particular sequence, 85613177Sgibbs * and that REQ is already set when inb_first is called. inb_{first,next} 85713177Sgibbs * use the same calling convention as inb. 85813177Sgibbs */ 85913177Sgibbs 86013177Sgibbsinb_next: 86113386Sgibbs or CLRSINT0, CLRSPIORDY 86213360Sgibbs mov NONE,SCSIDATL /*dummy read from latch to ACK*/ 86313360Sgibbsinb_next_wait: 86413360Sgibbs test SSTAT1,PHASEMIS jnz mesgin_phasemis 86513360Sgibbs test SSTAT0,SPIORDY jz inb_next_wait /* wait for next byte */ 86613313Sgibbsinb_first: 8674568Sgibbs mov DINDEX,SINDEX 86813177Sgibbs mov DINDIR,SCSIBUSL ret /*read byte directly from bus*/ 86913177Sgibbsinb_last: 87013360Sgibbs mov NONE,SCSIDATL ret /*dummy read from latch to ACK*/ 8714568Sgibbs 87213177Sgibbsmesgin_phasemis: 87313177Sgibbs/* 87413177Sgibbs * We expected to receive another byte, but the target changed phase 87513177Sgibbs */ 87613177Sgibbs mvi INTSTAT, MSGIN_PHASEMIS 87713177Sgibbs jmp ITloop 8784568Sgibbs 87913177Sgibbs/* 88013177Sgibbs * DMA data transfer. HADDR and HCNT must be loaded first, and 88113177Sgibbs * SINDEX should contain the value to load DFCNTRL with - 0x3d for 88213177Sgibbs * host->scsi, or 0x39 for scsi->host. The SCSI channel is cleared 88313177Sgibbs * during initialization. 88413177Sgibbs */ 8854568Sgibbsdma: 8864568Sgibbs mov DFCNTRL,SINDEX 8874568Sgibbsdma1: 88813177Sgibbs test SSTAT0,DMADONE jnz dma3 88913177Sgibbs test SSTAT1,PHASEMIS jz dma1 /* ie. underrun */ 8904568Sgibbs 89113177Sgibbs/* 89213177Sgibbs * We will be "done" DMAing when the transfer count goes to zero, or 89313177Sgibbs * the target changes the phase (in light of this, it makes sense that 89413177Sgibbs * the DMA circuitry doesn't ACK when PHASEMIS is active). If we are 89513177Sgibbs * doing a SCSI->Host transfer, the data FIFO should be flushed auto- 89613177Sgibbs * magically on STCNT=0 or a phase change, so just wait for FIFO empty 89713177Sgibbs * status. 89813177Sgibbs */ 8994568Sgibbsdma3: 90013177Sgibbs test SINDEX,DIRECTION jnz dma5 9014568Sgibbsdma4: 90213177Sgibbs test DFSTATUS,FIFOEMP jz dma4 9034568Sgibbs 90413177Sgibbs/* 90513177Sgibbs * Now shut the DMA enables off and make sure that the DMA enables are 90613177Sgibbs * actually off first lest we get an ILLSADDR. 90713177Sgibbs */ 9084568Sgibbsdma5: 90913177Sgibbs /* disable DMA, but maintain WIDEODD */ 91013690Sgibbs and DFCNTRL,WIDEODD 9114568Sgibbsdma6: 91213177Sgibbs test DFCNTRL,0x38 jnz dma6 /* SCSIENACK|SDMAENACK|HDMAENACK */ 9134568Sgibbs 9144568Sgibbs ret 9154568Sgibbs 91613177Sgibbs/* 91713177Sgibbs * Common SCSI initialization for selection and reselection. Expects 91813177Sgibbs * the target SCSI ID to be in the upper four bits of SINDEX, and A's 91913177Sgibbs * contents are stomped on return. 92013177Sgibbs */ 9218104Sgibbsinitialize_scsiid: 92213177Sgibbs and SINDEX,0xf0 /* Get target ID */ 9235775Sgibbs and A,0x0f,SCSIID 9245775Sgibbs or SINDEX,A 9258104Sgibbs mov SCSIID,SINDEX ret 9265326Sgibbs 92713177Sgibbs/* 92813177Sgibbs * Assert that if we've been reselected, then we've seen an IDENTIFY 92913177Sgibbs * message. 93013177Sgibbs */ 9314568Sgibbsassert: 93213177Sgibbs test FLAGS,RESELECTED jz return /* reselected? */ 93313177Sgibbs test FLAGS,IDENTIFY_SEEN jnz return /* seen IDENTIFY? */ 9344568Sgibbs 93513177Sgibbs mvi INTSTAT,NO_IDENT ret /* no - cause a kernel panic */ 9364568Sgibbs 93713177Sgibbs/* 93815328Sgibbs * Locate the SCB matching the target ID/channel/lun in SAVED_TCL, and the tag 93915328Sgibbs * value in ARG_1. If ARG_1 == SCB_LIST_NULL, we're looking for a non-tagged 94015328Sgibbs * SCB. Have the kernel print a warning message if it can't be found, and 94115328Sgibbs * generate an ABORT/ABORT_TAG message to the target. SINDEX should be 94213177Sgibbs * cleared on call. 94313177Sgibbs */ 9444568SgibbsfindSCB: 9456608Sgibbs mov A,SAVED_TCL 94615328Sgibbs mov SCBPTR,SINDEX /* switch to next SCB */ 94715328Sgibbs mvi SEQCTL,0x50 /* PAUSEDIS|FASTMODE */ 94813177Sgibbs cmp SCB_TCL,A jne findSCB1 /* target ID/channel/lun match? */ 94913177Sgibbs test SCB_CONTROL,DISCONNECTED jz findSCB1 /*should be disconnected*/ 95015328Sgibbs test SCB_CONTROL,TAG_ENB jnz findTaggedSCB 95115328Sgibbs cmp ARG_1,SCB_LIST_NULL je foundSCB 95215328Sgibbs jmp findSCB1 95315328SgibbsfindTaggedSCB: 95415328Sgibbs mov A, ARG_1 /* Tag passed in ARG_1 */ 95515328Sgibbs cmp SCB_TAG,A jne findSCB1 /* Found it? */ 95615328SgibbsfoundSCB: 95715328Sgibbs test FLAGS,PAGESCBS jz foundSCB_ret 95815328Sgibbs/* Remove this SCB from the disconnection list */ 95915328Sgibbs cmp SCB_NEXT,SCB_LIST_NULL je unlink_prev 96015328Sgibbs mov SAVED_LINKPTR, SCB_PREV 96115328Sgibbs mov SCBPTR, SCB_NEXT 96215328Sgibbs mov SCB_PREV, SAVED_LINKPTR 96315328Sgibbs mov SCBPTR, SINDEX 96415328Sgibbsunlink_prev: 96515328Sgibbs cmp SCB_PREV,SCB_LIST_NULL je rHead/* At the head of the list */ 96615328Sgibbs mov SAVED_LINKPTR, SCB_NEXT 96715328Sgibbs mov SCBPTR, SCB_PREV 96815328Sgibbs mov SCB_NEXT, SAVED_LINKPTR 96915328Sgibbs mov SCBPTR, SINDEX 97015328Sgibbs mvi SEQCTL,0x10 ret /* !PAUSEDIS|FASTMODE */ 97115328SgibbsrHead: 97215328Sgibbs mov DISCONNECTED_SCBH,SCB_NEXT 97315328SgibbsfoundSCB_ret: 97415328Sgibbs mvi SEQCTL,0x10 ret /* !PAUSEDIS|FASTMODE */ 9754568Sgibbs 9766608SgibbsfindSCB1: 97715328Sgibbs mvi SEQCTL,0x10 /* !PAUSEDIS|FASTMODE */ 9784568Sgibbs inc SINDEX 9794568Sgibbs mov A,SCBCOUNT 9806608Sgibbs cmp SINDEX,A jne findSCB 9814568Sgibbs 98213177Sgibbs mvi INTSTAT,NO_MATCH /* not found - signal kernel */ 98315328Sgibbs cmp RETURN_1,SCB_PAGEDIN je return 98415328Sgibbs or SCSISIGO,ATNO /* assert ATNO */ 98515328Sgibbs cmp ARG_1,SCB_LIST_NULL jne find_abort_tag 98615328Sgibbs mvi MSG_ABORT call mk_mesg 98715328Sgibbs jmp ITloop 98815328Sgibbsfind_abort_tag: 98915328Sgibbs mvi MSG_ABORT_TAG call mk_mesg 99015328Sgibbs jmp ITloop 9914568Sgibbs 99213177Sgibbs/* 99313177Sgibbs * Make a working copy of the scatter-gather parameters from the SCB. 99413177Sgibbs */ 9954568Sgibbssg_scb2ram: 99613690Sgibbs mov HADDR0, SCB_DATAPTR0 99713690Sgibbs mov HADDR1, SCB_DATAPTR1 99813690Sgibbs mov HADDR2, SCB_DATAPTR2 99913690Sgibbs mov HADDR3, SCB_DATAPTR3 100013690Sgibbs mov HCNT0, SCB_DATACNT0 100113690Sgibbs mov HCNT1, SCB_DATACNT1 100213690Sgibbs mov HCNT2, SCB_DATACNT2 10039928Sgibbs 100413690Sgibbs mov STCNT0, HCNT0 100513690Sgibbs mov STCNT1, HCNT1 100613690Sgibbs mov STCNT2, HCNT2 10079928Sgibbs 100813177Sgibbs mov SG_COUNT,SCB_SGCOUNT 10094568Sgibbs 101013690Sgibbs mov SG_NEXT0, SCB_SGPTR0 101113690Sgibbs mov SG_NEXT1, SCB_SGPTR1 101213690Sgibbs mov SG_NEXT2, SCB_SGPTR2 101313690Sgibbs mov SG_NEXT3, SCB_SGPTR3 ret 10144568Sgibbs 101513177Sgibbs/* 101613177Sgibbs * Copying RAM values back to SCB, for Save Data Pointers message, but 101713177Sgibbs * only if we've actually been into a data phase to change them. This 101813177Sgibbs * protects against bogus data in scratch ram and the residual counts 101913177Sgibbs * since they are only initialized when we go into data_in or data_out. 102013177Sgibbs */ 10214568Sgibbssg_ram2scb: 10229928Sgibbs test FLAGS, DPHASE jz return 102313177Sgibbs mov SCB_SGCOUNT,SG_COUNT 10244568Sgibbs 102513690Sgibbs mov SCB_SGPTR0,SG_NEXT0 102613690Sgibbs mov SCB_SGPTR1,SG_NEXT1 102713690Sgibbs mov SCB_SGPTR2,SG_NEXT2 102813690Sgibbs mov SCB_SGPTR3,SG_NEXT3 10299928Sgibbs 103013690Sgibbs mov SCB_DATAPTR0,SHADDR0 103113690Sgibbs mov SCB_DATAPTR1,SHADDR1 103213690Sgibbs mov SCB_DATAPTR2,SHADDR2 103313690Sgibbs mov SCB_DATAPTR3,SHADDR3 10344568Sgibbs 103513177Sgibbs/* 103613177Sgibbs * Use the residual number since STCNT is corrupted by any message transfer 103713177Sgibbs */ 103813690Sgibbs mov SCB_DATACNT0,SCB_RESID_DCNT0 103913690Sgibbs mov SCB_DATACNT1,SCB_RESID_DCNT1 104013690Sgibbs mov SCB_DATACNT2,SCB_RESID_DCNT2 ret 10414568Sgibbs 104213177Sgibbs/* 104313177Sgibbs * Add the array base TARG_SCRATCH to the target offset (the target address 104413177Sgibbs * is in SCSIID), and return the result in SINDEX. The accumulator 104513177Sgibbs * contains the 3->8 decoding of the target ID on return. 104613177Sgibbs */ 10475562Sgibbsndx_dtr: 10484568Sgibbs shr A,SCSIID,4 104913177Sgibbs test SBLKCTL,SELBUSB jz ndx_dtr_2 105013177Sgibbs or A,0x08 /* Channel B entries add 8 */ 10515562Sgibbsndx_dtr_2: 105213690Sgibbs add SINDEX,TARG_SCRATCH,A ret 10534568Sgibbs 105413177Sgibbs/* 105513177Sgibbs * If we need to negotiate transfer parameters, build the WDTR or SDTR message 105613177Sgibbs * starting at the address passed in SINDEX. DINDEX is modified on return. 105713177Sgibbs * The SCSI-II spec requires that Wide negotiation occur first and you can 105813177Sgibbs * only negotiat one or the other at a time otherwise in the event of a message 105913177Sgibbs * reject, you wouldn't be able to tell which message was the culpret. 106013177Sgibbs */ 10615562Sgibbsmk_dtr: 106213177Sgibbs test SCB_CONTROL,NEEDWDTR jnz mk_wdtr_16bit 106315328Sgibbs mvi ARG_1, MAXOFFSET /* Force an offset of 15 or 8 if WIDE */ 10644568Sgibbs 10657532Sgibbsmk_sdtr: 106613177Sgibbs mvi DINDIR,1 /* extended message */ 106713177Sgibbs mvi DINDIR,3 /* extended message length = 3 */ 106813177Sgibbs mvi DINDIR,1 /* SDTR code */ 10697532Sgibbs call sdtr_to_rate 107013177Sgibbs mov DINDIR,RETURN_1 /* REQ/ACK transfer period */ 107115328Sgibbs cmp ARG_1, MAXOFFSET je mk_sdtr_max_offset 107213177Sgibbs and DINDIR,0x0f,SINDIR /* Sync Offset */ 10737532Sgibbs 10747532Sgibbsmk_sdtr_done: 107513177Sgibbs add MSG_LEN,COMP_MSG0,DINDEX ret /* update message length */ 10767532Sgibbs 10778567Sdgmk_sdtr_max_offset: 107813177Sgibbs/* 107913177Sgibbs * We're initiating sync negotiation, so request the max offset we can (15 or 8) 108013177Sgibbs */ 108113177Sgibbs /* Talking to a WIDE device? */ 108213177Sgibbs test SCSIRATE, WIDEXFER jnz wmax_offset 10838567Sdg mvi DINDIR, MAX_OFFSET_8BIT 10847532Sgibbs jmp mk_sdtr_done 10857532Sgibbs 10868567Sdgwmax_offset: 108713177Sgibbs mvi DINDIR, MAX_OFFSET_16BIT 10888567Sdg jmp mk_sdtr_done 10898567Sdg 10905647Sgibbsmk_wdtr_16bit: 10915647Sgibbs mvi ARG_1,BUS_16_BIT 10925562Sgibbsmk_wdtr: 109313177Sgibbs mvi DINDIR,1 /* extended message */ 109413177Sgibbs mvi DINDIR,2 /* extended message length = 2 */ 109513177Sgibbs mvi DINDIR,3 /* WDTR code */ 109613177Sgibbs mov DINDIR,ARG_1 /* bus width */ 10975562Sgibbs 109813177Sgibbs add MSG_LEN,COMP_MSG0,DINDEX ret /* update message length */ 10995562Sgibbs 11005562Sgibbssdtr_to_rate: 110113177Sgibbs call ndx_dtr /* index scratch space for target */ 11025562Sgibbs shr A,SINDIR,0x4 110313177Sgibbs dec SINDEX /* Preserve SINDEX */ 11045562Sgibbs and A,0x7 11055562Sgibbs clr RETURN_1 11065562Sgibbssdtr_to_rate_loop: 11075562Sgibbs test A,0x0f jz sdtr_to_rate_done 110813177Sgibbs add RETURN_1,0x19 11095562Sgibbs dec A 11105562Sgibbs jmp sdtr_to_rate_loop 11115562Sgibbssdtr_to_rate_done: 11125562Sgibbs shr RETURN_1,0x2 111313177Sgibbs add RETURN_1,0x19 111411829Sgibbs test SXFRCTL0,ULTRAEN jz return 111511829Sgibbs shr RETURN_1,0x1 11167532Sgibbsreturn: 11177532Sgibbs ret 1118