aic7xxx.seq revision 15998
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 4215998SgibbsVERSION AIC7XXX_SEQ_VER "$Id: aic7xxx.seq,v 1.37 1996/05/27 23:16:55 gibbs Exp $" 435647Sgibbs 4415998Sgibbs#if defined(__NetBSD__) 4515998Sgibbs#include "../../../../dev/ic/aic7xxxreg.h" 4615998Sgibbs#elif defined(__FreeBSD__) 4713177Sgibbs#include "../../dev/aic7xxx/aic7xxx_reg.h" 4815998Sgibbs#endif 494568Sgibbs 5013177Sgibbs/* 5113177Sgibbs * We can't just use ACCUM in the sequencer code because it 5213177Sgibbs * must be treated specially by the assembler, and it currently 5313690Sgibbs * looks for the symbol 'A'. This is the only register defined in 5413177Sgibbs * the assembler's symbol space. 5513177Sgibbs */ 5613177SgibbsA = ACCUM 574568Sgibbs 5813690Sgibbs/* After starting the selection hardware, we check for reconnecting targets 5913690Sgibbs * as well as for our selection to complete just in case the reselection wins 6013690Sgibbs * bus arbitration. The problem with this is that we must keep track of the 6113690Sgibbs * SCB that we've already pulled from the QINFIFO and started the selection 6213690Sgibbs * on just in case the reselection wins so that we can retry the selection at 6313690Sgibbs * a later time. This problem cannot be resolved by holding a single entry 6413690Sgibbs * in scratch ram since a reconnecting target can request sense and this will 6513690Sgibbs * create yet another SCB waiting for selection. The solution used here is to 6613690Sgibbs * use byte 27 of the SCB as a psuedo-next pointer and to thread a list 6713177Sgibbs * of SCBs that are awaiting selection. Since 0-0xfe are valid SCB offsets, 6813177Sgibbs * SCB_LIST_NULL is 0xff which is out of range. The kernel driver must 6913177Sgibbs * add an entry to this list everytime a request sense occurs. The sequencer 7013177Sgibbs * will automatically consume the entries. 7113177Sgibbs */ 724568Sgibbs 7313177Sgibbs/* 7414449Sgibbs * We assume that the kernel driver may reset us at any time, even in the 7514449Sgibbs * middle of a DMA, so clear DFCNTRL too. 7613177Sgibbs */ 7714449Sgibbsreset: 7814449Sgibbs clr DFCNTRL 7914449Sgibbs clr SCSISIGO /* De-assert BSY */ 8014449Sgibbs/* 8114449Sgibbs * We jump to start after every bus free. 8214449Sgibbs */ 8313177Sgibbsstart: 8415328Sgibbs and FLAGS,0x0f /* clear target specific flags */ 8513177Sgibbs mvi SCSISEQ,ENRSELI /* Always allow reselection */ 868104Sgibbspoll_for_work: 8713177Sgibbs /* 8813177Sgibbs * Are we a twin channel device? 8913177Sgibbs * For fairness, we check the other bus first, 9013177Sgibbs * since we just finished a transaction on the 9113177Sgibbs * current channel. 9213177Sgibbs */ 9313177Sgibbs test FLAGS,TWIN_BUS jz start2 9413177Sgibbs xor SBLKCTL,SELBUSB /* Toggle to the other bus */ 958104Sgibbs test SSTAT0,SELDI jnz reselect 9613177Sgibbs xor SBLKCTL,SELBUSB /* Toggle to the original bus */ 975326Sgibbsstart2: 988104Sgibbs test SSTAT0,SELDI jnz reselect 999395Sgibbs cmp WAITING_SCBH,SCB_LIST_NULL jne start_waiting 10014934Sgibbs mov A, QCNTMASK 10114934Sgibbs test QINCNT,A jz poll_for_work 1024568Sgibbs 10313690Sgibbs/* 10413690Sgibbs * We have at least one queued SCB now and we don't have any 10513177Sgibbs * SCBs in the list of SCBs awaiting selection. Set the SCB 10613177Sgibbs * pointer from the FIFO so we see the right bank of SCB 10713177Sgibbs * registers. 10813177Sgibbs */ 1094568Sgibbs mov SCBPTR,QINFIFO 1104568Sgibbs 11113177Sgibbs/* 11213177Sgibbs * See if there is not already an active SCB for this target. This code 11313177Sgibbs * locks out on a per target basis instead of target/lun. Although this 11413177Sgibbs * is not ideal for devices that have multiple luns active at the same 11513177Sgibbs * time, it is faster than looping through all SCB's looking for active 11613177Sgibbs * commands. It may be benificial to make findscb a more general procedure 11713177Sgibbs * to see if the added cost of the search is negligible. This code also 11813177Sgibbs * assumes that the kernel driver will clear the active flags on board 11913177Sgibbs * initialization, board reset, and a target SELTO. Tagged commands 12013690Sgibbs * don't set the active bits since you can queue more than one command 12113690Sgibbs * at a time. We do, however, look to see if there are any non-tagged 12213690Sgibbs * I/Os in progress, and requeue the command if there are. Tagged and 12313690Sgibbs * non-tagged commands cannot be mixed to a single target. 12413177Sgibbs */ 1254568Sgibbs 1265647Sgibbstest_busy: 12713177Sgibbs mov FUNCTION1,SCB_TCL 1284568Sgibbs mov A,FUNCTION1 12913177Sgibbs test SCB_TCL,0x88 jz test_a /* Id < 8 && A channel */ 1305326Sgibbs 1315326Sgibbs test ACTIVE_B,A jnz requeue 13213177Sgibbs test SCB_CONTROL,TAG_ENB jnz start_scb 13313177Sgibbs /* Mark the current target as busy */ 13413177Sgibbs or ACTIVE_B,A 1355326Sgibbs jmp start_scb 1365326Sgibbs 13713177Sgibbs/* Place the currently active SCB back on the queue for later processing */ 1385326Sgibbsrequeue: 1394568Sgibbs mov QINFIFO, SCBPTR 1408104Sgibbs jmp poll_for_work 1414568Sgibbs 14213177Sgibbs/* 14313177Sgibbs * Pull the first entry off of the waiting for selection list 14413177Sgibbs * We don't have to "test_busy" because only transactions that 14513177Sgibbs * have passed that test can be in the waiting_scb list. 14613177Sgibbs */ 1478104Sgibbsstart_waiting: 1488104Sgibbs mov SCBPTR,WAITING_SCBH 14913177Sgibbs jmp start_scb2 1508104Sgibbs 1515326Sgibbstest_a: 15213177Sgibbs test ACTIVE_A,A jnz requeue 15313177Sgibbs test SCB_CONTROL,TAG_ENB jnz start_scb 15413177Sgibbs /* Mark the current target as busy */ 15513177Sgibbs or ACTIVE_A,A 1565326Sgibbs 1575326Sgibbsstart_scb: 15815328Sgibbs mov SCB_NEXT,WAITING_SCBH 15913177Sgibbs mov WAITING_SCBH, SCBPTR 16013177Sgibbsstart_scb2: 16113177Sgibbs and SINDEX,0xf7,SBLKCTL /* Clear the channel select bit */ 16213177Sgibbs and A,0x08,SCB_TCL /* Get new channel bit */ 16313177Sgibbs or SINDEX,A 16413177Sgibbs mov SBLKCTL,SINDEX /* select channel */ 16513177Sgibbs mov SCB_TCL call initialize_scsiid 1668104Sgibbs 16713177Sgibbs/* 16813177Sgibbs * Enable selection phase as an initiator, and do automatic ATN 16913177Sgibbs * after the selection. We do this now so that we can overlap the 17013177Sgibbs * rest of our work to set up this target with the arbitration and 17113177Sgibbs * selection bus phases. 17213177Sgibbs */ 1738104Sgibbsstart_selection: 17413177Sgibbs mvi SCSISEQ,0x58 /* ENSELO|ENAUTOATNO|ENRSELI */ 1754568Sgibbs 17613177Sgibbs/* 17713177Sgibbs * As soon as we get a successful selection, the target should go 17813177Sgibbs * into the message out phase since we have ATN asserted. Prepare 17913177Sgibbs * the message to send. 18013177Sgibbs * 18113177Sgibbs * Messages are stored in scratch RAM starting with a length byte 18213177Sgibbs * followed by the message itself. 18313177Sgibbs */ 18413177Sgibbs test SCB_CMDLEN,0xff jnz mk_identify /* 0 Length Command? */ 1858567Sdg 18613177Sgibbs/* 18713177Sgibbs * The kernel has sent us an SCB with no command attached. This implies 18813177Sgibbs * that the kernel wants to send a message of some sort to this target, 18913177Sgibbs * so we interrupt the driver, allow it to fill the message buffer, and 19013177Sgibbs * then go back into the arbitration loop 19113177Sgibbs */ 1928567Sdg mvi INTSTAT,AWAITING_MSG 1939917Sgibbs jmp wait_for_selection 1948567Sdg 19513177Sgibbsmk_identify: 19613177Sgibbs and A,DISCENB,SCB_CONTROL /* mask off disconnect privledge */ 1974568Sgibbs 19813690Sgibbs and MSG0,0x7,SCB_TCL /* lun */ 19913690Sgibbs or MSG0,A /* or in disconnect privledge */ 20013690Sgibbs or MSG0,MSG_IDENTIFY 20113690Sgibbs mvi MSG_LEN, 1 2024568Sgibbs 20313177Sgibbs test SCB_CONTROL,0xb0 jz !message /* WDTR, SDTR or TAG?? */ 20413177Sgibbs/* 20515328Sgibbs * Send a tag message if TAG_ENB is set in the SCB control block. 20615328Sgibbs * Use SCB_TAG (the position in the kernel's SCB array) as the tag value. 20713177Sgibbs */ 2084568Sgibbs 2096608Sgibbsmk_tag: 21013177Sgibbs mvi DINDEX, MSG1 21113177Sgibbs test SCB_CONTROL,TAG_ENB jz mk_tag_done 21215328Sgibbs and DINDIR,0x23,SCB_CONTROL 21315328Sgibbs mov DINDIR,SCB_TAG 2146608Sgibbs 21513177Sgibbs add MSG_LEN,COMP_MSG0,DINDEX /* update message length */ 2166608Sgibbs 2176608Sgibbsmk_tag_done: 2186608Sgibbs 21913690Sgibbs test SCB_CONTROL,0x90 jz !message /* NEEDWDTR|NEEDSDTR */ 22013177Sgibbs mov DINDEX call mk_dtr /* build DTR message if needed */ 2216608Sgibbs 2224568Sgibbs!message: 2239917Sgibbswait_for_selection: 22413177Sgibbs test SSTAT0,SELDO jnz select 22513177Sgibbs test SSTAT0,SELDI jz wait_for_selection 2264568Sgibbs 22713177Sgibbs/* 22813177Sgibbs * Reselection has been initiated by a target. Make a note that we've been 22913177Sgibbs * reselected, but haven't seen an IDENTIFY message from the target 23013177Sgibbs * yet. 23113177Sgibbs */ 2324568Sgibbsreselect: 23313177Sgibbs clr MSG_LEN /* Don't have anything in the mesg buffer */ 2348104Sgibbs mov SELID call initialize_scsiid 23513177Sgibbs or FLAGS,RESELECTED 23613177Sgibbs jmp select2 2374568Sgibbs 23813177Sgibbs/* 23913177Sgibbs * After the selection, remove this SCB from the "waiting for selection" 24013177Sgibbs * list. This is achieved by simply moving our "next" pointer into 24113177Sgibbs * WAITING_SCBH. Our next pointer will be set to null the next time this 24213177Sgibbs * SCB is used, so don't bother with it now. 24313177Sgibbs */ 2448104Sgibbsselect: 24515328Sgibbs mov WAITING_SCBH,SCB_NEXT 24615328Sgibbs or FLAGS,SELECTED 2478104Sgibbsselect2: 24813177Sgibbs/* 24913177Sgibbs * Set CLRCHN here before the target has entered a data transfer mode - 25013177Sgibbs * with synchronous SCSI, if you do it later, you blow away some 25113177Sgibbs * data in the SCSI FIFO that the target has already sent to you. 25213177Sgibbs */ 25313177Sgibbs or SXFRCTL0,CLRCHN 25413177Sgibbs/* 25513177Sgibbs * Initialize SCSIRATE with the appropriate value for this target. 25613177Sgibbs */ 25713177Sgibbs call ndx_dtr 25813177Sgibbs mov SCSIRATE,SINDIR 25913177Sgibbs 26015843Sgibbs/* 26115881Sgibbs * Initialize Ultra mode setting. 26215843Sgibbs */ 26315881Sgibbs mov FUNCTION1,SCSIID 26415881Sgibbs mov A,FUNCTION1 26515843Sgibbs and SINDEX,0xdf,SXFRCTL0 /* default to Ultra disabled */ 26615843Sgibbs test SCSIID, 0x80 jnz ultra_b /* Target ID > 7 */ 26715843Sgibbs test SBLKCTL, SELBUSB jnz ultra_b /* Second channel device */ 26815843Sgibbs test ULTRA_ENB,A jz set_sxfrctl0 26915843Sgibbs or SINDEX, ULTRAEN jmp set_sxfrctl0 27015843Sgibbsultra_b: 27115843Sgibbs test ULTRA_ENB_B,A jz set_sxfrctl0 27215843Sgibbs or SINDEX, ULTRAEN 27315843Sgibbs 27415843Sgibbsset_sxfrctl0: 27515843Sgibbs mov SXFRCTL0,SINDEX 27615843Sgibbs 27713177Sgibbs mvi SCSISEQ,ENAUTOATNP /* 27813177Sgibbs * ATN on parity errors 27913177Sgibbs * for "in" phases 28013177Sgibbs */ 28113177Sgibbs mvi CLRSINT1,CLRBUSFREE 28213177Sgibbs mvi CLRSINT0,0x60 /* CLRSELDI|CLRSELDO */ 28313177Sgibbs/* 28413177Sgibbs * Main loop for information transfer phases. If BSY is false, then 28513177Sgibbs * we have a bus free condition, expected or not. Otherwise, wait 28613177Sgibbs * for the target to assert REQ before checking MSG, C/D and I/O 28713177Sgibbs * for the bus phase. 28813177Sgibbs * 28913177Sgibbs */ 2904568SgibbsITloop: 29113177Sgibbs test SSTAT1,BUSFREE jnz p_busfree 29213177Sgibbs test SSTAT1,REQINIT jz ITloop 2934568Sgibbs 29413177Sgibbs and A,PHASE_MASK,SCSISIGI 29513690Sgibbs mov LASTPHASE,A 29613690Sgibbs mov SCSISIGO,A 2974568Sgibbs 2984568Sgibbs cmp ALLZEROS,A je p_dataout 29913177Sgibbs cmp A,P_DATAIN je p_datain 30013177Sgibbs cmp A,P_COMMAND je p_command 30113177Sgibbs cmp A,P_MESGOUT je p_mesgout 30213177Sgibbs cmp A,P_STATUS je p_status 30313177Sgibbs cmp A,P_MESGIN je p_mesgin 3044568Sgibbs 30513177Sgibbs mvi INTSTAT,BAD_PHASE /* unknown phase - signal driver */ 30615843Sgibbs jmp ITloop /* Try reading the bus again. */ 3074568Sgibbs 3084568Sgibbsp_dataout: 30913177Sgibbs mvi DMAPARAMS,0x7d /* 31013177Sgibbs * WIDEODD|SCSIEN|SDMAEN|HDMAEN| 31113177Sgibbs * DIRECTION|FIFORESET 31213177Sgibbs */ 3139928Sgibbs jmp data_phase_init 3144568Sgibbs 31513177Sgibbs/* 31613177Sgibbs * If we re-enter the data phase after going through another phase, the 31713177Sgibbs * STCNT may have been cleared, so restore it from the residual field. 31813177Sgibbs */ 3199928Sgibbsdata_phase_reinit: 32013690Sgibbs mov STCNT0,SCB_RESID_DCNT0 32113690Sgibbs mov STCNT1,SCB_RESID_DCNT1 32213690Sgibbs mov STCNT2,SCB_RESID_DCNT2 3239928Sgibbs jmp data_phase_loop 3244568Sgibbs 3259928Sgibbsp_datain: 32613177Sgibbs mvi DMAPARAMS,0x79 /* 32713177Sgibbs * WIDEODD|SCSIEN|SDMAEN|HDMAEN| 32813177Sgibbs * !DIRECTION|FIFORESET 32913177Sgibbs */ 3309928Sgibbsdata_phase_init: 3319928Sgibbs call assert 3325775Sgibbs 3339928Sgibbs test FLAGS, DPHASE jnz data_phase_reinit 3349928Sgibbs call sg_scb2ram 33513177Sgibbs or FLAGS, DPHASE /* We have seen a data phase */ 3364568Sgibbs 3379928Sgibbsdata_phase_loop: 33813177Sgibbs/* If we are the last SG block, don't set wideodd. */ 3399928Sgibbs cmp SG_COUNT,0x01 jne data_phase_wideodd 34013177Sgibbs and DMAPARAMS, 0xbf /* Turn off WIDEODD */ 3419928Sgibbsdata_phase_wideodd: 3429928Sgibbs mov DMAPARAMS call dma 3434568Sgibbs 34413177Sgibbs/* Exit if we had an underrun */ 34513177Sgibbs test SSTAT0,SDONE jz data_phase_finish /* underrun STCNT != 0 */ 3467532Sgibbs 34713177Sgibbs/* 34813177Sgibbs * Advance the scatter-gather pointers if needed 34913177Sgibbs */ 3509928Sgibbssg_advance: 35113177Sgibbs dec SG_COUNT /* one less segment to go */ 3524568Sgibbs 35313177Sgibbs test SG_COUNT, 0xff jz data_phase_finish /* Are we done? */ 3544568Sgibbs 35513177Sgibbs clr A /* add sizeof(struct scatter) */ 35613177Sgibbs add SG_NEXT0,SG_SIZEOF,SG_NEXT0 35713177Sgibbs adc SG_NEXT1,A,SG_NEXT1 3584568Sgibbs 35913177Sgibbs/* 36013177Sgibbs * Load a struct scatter and set up the data address and length. 36113177Sgibbs * If the working value of the SG count is nonzero, then 36213177Sgibbs * we need to load a new set of values. 36313177Sgibbs * 36415328Sgibbs * This, like all DMA's, assumes little-endian host data storage. 36513177Sgibbs */ 3669928Sgibbssg_load: 36713177Sgibbs clr HCNT2 36813177Sgibbs clr HCNT1 36913177Sgibbs mvi HCNT0,SG_SIZEOF 3704568Sgibbs 37113690Sgibbs mov HADDR0,SG_NEXT0 37213690Sgibbs mov HADDR1,SG_NEXT1 37313690Sgibbs mov HADDR2,SG_NEXT2 37413690Sgibbs mov HADDR3,SG_NEXT3 3754568Sgibbs 37613690Sgibbs or DFCNTRL,0xd /* HDMAEN|DIRECTION|FIFORESET */ 3779928Sgibbs 37813177Sgibbs/* 37913177Sgibbs * Wait for DMA from host memory to data FIFO to complete, then disable 38013177Sgibbs * DMA and wait for it to acknowledge that it's off. 38113177Sgibbs */ 38213690Sgibbsdma_finish: 38313690Sgibbs test DFSTATUS,HDONE jz dma_finish 38413690Sgibbs /* Turn off DMA preserving WIDEODD */ 38513690Sgibbs and DFCNTRL,WIDEODD 38613690Sgibbsdma_finish2: 38713690Sgibbs test DFCNTRL,HDMAENACK jnz dma_finish2 3889928Sgibbs 38913177Sgibbs/* 39013177Sgibbs * Copy data from FIFO into SCB data pointer and data count. This assumes 39113177Sgibbs * that the struct scatterlist has this structure (this and sizeof(struct 39214449Sgibbs * scatterlist) == 12 are asserted in aic7xxx.c for the Linux driver): 39313177Sgibbs * 39413177Sgibbs * struct scatterlist { 39513177Sgibbs * char *address; four bytes, little-endian order 39613177Sgibbs * ... four bytes, ignored 39713177Sgibbs * unsigned short length; two bytes, little-endian order 39813177Sgibbs * } 39913177Sgibbs * 40013177Sgibbs * 40114449Sgibbs * In FreeBSD, the scatter list entry is only 8 bytes. 40213177Sgibbs * 40313177Sgibbs * struct ahc_dma_seg { 40413177Sgibbs * physaddr addr; four bytes, little-endian order 40513177Sgibbs * long len; four bytes, little endian order 40613177Sgibbs * }; 40713177Sgibbs */ 4089928Sgibbs 40914449Sgibbs mov HADDR0,DFDAT 41014449Sgibbs mov HADDR1,DFDAT 41114449Sgibbs mov HADDR2,DFDAT 41214449Sgibbs mov HADDR3,DFDAT 41313177Sgibbs/* 41413177Sgibbs * For Linux, we must throw away four bytes since there is a 32bit gap 41514449Sgibbs * in the middle of a struct scatterlist. 41613177Sgibbs */ 41715709Sgibbs#ifdef __linux__ 41813177Sgibbs mov NONE,DFDAT 41913177Sgibbs mov NONE,DFDAT 42013177Sgibbs mov NONE,DFDAT 42113177Sgibbs mov NONE,DFDAT 42214449Sgibbs#endif 42313690Sgibbs mov HCNT0,DFDAT 42413690Sgibbs mov HCNT1,DFDAT 42513690Sgibbs mov HCNT2,DFDAT 4264568Sgibbs 42713177Sgibbs/* Load STCNT as well. It is a mirror of HCNT */ 42813690Sgibbs mov STCNT0,HCNT0 42913690Sgibbs mov STCNT1,HCNT1 43013690Sgibbs mov STCNT2,HCNT2 4319928Sgibbs test SSTAT1,PHASEMIS jz data_phase_loop 4324568Sgibbs 4339928Sgibbsdata_phase_finish: 43413177Sgibbs/* 43513177Sgibbs * After a DMA finishes, save the SG and STCNT residuals back into the SCB 43613177Sgibbs * We use STCNT instead of HCNT, since it's a reflection of how many bytes 43713177Sgibbs * were transferred on the SCSI (as opposed to the host) bus. 43813177Sgibbs */ 43913690Sgibbs mov SCB_RESID_DCNT0,STCNT0 44013690Sgibbs mov SCB_RESID_DCNT1,STCNT1 44113690Sgibbs mov SCB_RESID_DCNT2,STCNT2 44213177Sgibbs mov SCB_RESID_SGCNT, SG_COUNT 4434568Sgibbs jmp ITloop 4444568Sgibbs 44513177Sgibbs/* 44615328Sgibbs * Command phase. Set up the DMA registers and let 'er rip. 44713177Sgibbs */ 4484568Sgibbsp_command: 4494568Sgibbs call assert 4504568Sgibbs 45113177Sgibbs/* 45215328Sgibbs * Load HADDR and HCNT. 45313177Sgibbs */ 45413690Sgibbs mov HADDR0, SCB_CMDPTR0 45513690Sgibbs mov HADDR1, SCB_CMDPTR1 45613690Sgibbs mov HADDR2, SCB_CMDPTR2 45713690Sgibbs mov HADDR3, SCB_CMDPTR3 45813690Sgibbs mov HCNT0, SCB_CMDLEN 45913690Sgibbs clr HCNT1 46013690Sgibbs clr HCNT2 4614568Sgibbs 46213690Sgibbs mov STCNT0, HCNT0 46313690Sgibbs mov STCNT1, HCNT1 46413690Sgibbs mov STCNT2, HCNT2 4654568Sgibbs 4664568Sgibbs mvi 0x3d call dma # SCSIEN|SDMAEN|HDMAEN| 4674568Sgibbs # DIRECTION|FIFORESET 4684568Sgibbs jmp ITloop 4694568Sgibbs 47013177Sgibbs/* 47113177Sgibbs * Status phase. Wait for the data byte to appear, then read it 47213177Sgibbs * and store it into the SCB. 47313177Sgibbs */ 4744568Sgibbsp_status: 47513177Sgibbs mvi SCB_TARGET_STATUS call inb_first 4769954Sgibbs jmp mesgin_done 4774568Sgibbs 47813177Sgibbs/* 47915328Sgibbs * Message out phase. If there is not an active message, but the target 48013177Sgibbs * took us into this phase anyway, build a no-op message and send it. 48113177Sgibbs */ 4824568Sgibbsp_mesgout: 48313177Sgibbs test MSG_LEN, 0xff jnz p_mesgout_start 48413177Sgibbs mvi MSG_NOP call mk_mesg /* build NOP message */ 4854568Sgibbs 48613177Sgibbsp_mesgout_start: 48713177Sgibbs/* 48813177Sgibbs * Set up automatic PIO transfer from MSG0. Bit 3 in 48913177Sgibbs * SXFRCTL0 (SPIOEN) is already on. 49013177Sgibbs */ 49113177Sgibbs mvi SINDEX,MSG0 4924568Sgibbs mov DINDEX,MSG_LEN 4934568Sgibbs 49413177Sgibbs/* 49513177Sgibbs * When target asks for a byte, drop ATN if it's the last one in 49613177Sgibbs * the message. Otherwise, keep going until the message is exhausted. 49713177Sgibbs * 49813177Sgibbs * Keep an eye out for a phase change, in case the target issues 49913177Sgibbs * a MESSAGE REJECT. 50013177Sgibbs */ 50113177Sgibbsp_mesgout_loop: 50213177Sgibbs test SSTAT0,SPIORDY jz p_mesgout_loop 50315998Sgibbs test SSTAT1,PHASEMIS jnz p_mesgout_phasemis 50413177Sgibbs cmp DINDEX,1 jne p_mesgout_outb /* last byte? */ 50513177Sgibbs mvi CLRSINT1,CLRATNO /* drop ATN */ 50613177Sgibbsp_mesgout_outb: 50713177Sgibbs dec DINDEX 50813386Sgibbs or CLRSINT0, CLRSPIORDY 5094568Sgibbs mov SCSIDATL,SINDIR 51013313Sgibbs 5114568Sgibbsp_mesgout4: 51213177Sgibbs test DINDEX,0xff jnz p_mesgout_loop 5134568Sgibbs 51413177Sgibbs/* 51513177Sgibbs * If the next bus phase after ATN drops is a message out, it means 51613177Sgibbs * that the target is requesting that the last message(s) be resent. 51713177Sgibbs */ 51813177Sgibbsp_mesgout_snoop: 51913177Sgibbs test SSTAT1,BUSFREE jnz p_mesgout_done 52013177Sgibbs test SSTAT1,REQINIT jz p_mesgout_snoop 5214568Sgibbs 52213177Sgibbs test SSTAT1,PHASEMIS jnz p_mesgout_done 5234568Sgibbs 52413690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 52513177Sgibbs 5264568Sgibbs jmp ITloop 5274568Sgibbs 52813177Sgibbsp_mesgout_phasemis: 52915328Sgibbs mvi CLRSINT1,CLRATNO /* Be sure to turn ATNO off */ 53013177Sgibbsp_mesgout_done: 53113177Sgibbs clr MSG_LEN /* no active msg */ 5324568Sgibbs jmp ITloop 5334568Sgibbs 53413177Sgibbs/* 53513177Sgibbs * Message in phase. Bytes are read using Automatic PIO mode. 53613177Sgibbs */ 5374568Sgibbsp_mesgin: 53813177Sgibbs mvi A call inb_first /* read the 1st message byte */ 53913177Sgibbs mov REJBYTE,A /* save it for the driver */ 5404568Sgibbs 54113177Sgibbs test A,MSG_IDENTIFY jnz mesgin_identify 54213177Sgibbs cmp A,MSG_DISCONNECT je mesgin_disconnect 54313177Sgibbs cmp A,MSG_SDPTRS je mesgin_sdptrs 54413177Sgibbs cmp ALLZEROS,A je mesgin_complete 54513177Sgibbs cmp A,MSG_RDPTRS je mesgin_rdptrs 54613177Sgibbs cmp A,MSG_EXTENDED je mesgin_extended 54713177Sgibbs cmp A,MSG_REJECT je mesgin_reject 5484568Sgibbs 5499954Sgibbsrej_mesgin: 55013177Sgibbs/* 55113177Sgibbs * We have no idea what this message in is, and there's no way 55213177Sgibbs * to pass it up to the kernel, so we issue a message reject and 55313177Sgibbs * hope for the best. Since we're now using manual PIO mode to 55413177Sgibbs * read in the message, there should no longer be a race condition 55513177Sgibbs * present when we assert ATN. In any case, rejection should be a 55613177Sgibbs * rare occurrence - signal the driver when it happens. 55713177Sgibbs */ 55813690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 55913177Sgibbs mvi INTSTAT,SEND_REJECT /* let driver know */ 5609954Sgibbs 56113177Sgibbs mvi MSG_REJECT call mk_mesg 5629954Sgibbs 5639954Sgibbsmesgin_done: 56413177Sgibbs call inb_last /*ack & turn auto PIO back on*/ 5659954Sgibbs jmp ITloop 5669954Sgibbs 5679954Sgibbs 5689954Sgibbsmesgin_complete: 56913177Sgibbs/* 57015328Sgibbs * We got a "command complete" message, so put the SCB_TAG into QUEUEOUT, 57115328Sgibbs * and trigger a completion interrupt. Check status for non zero return 57215328Sgibbs * and interrupt driver if needed. This allows the driver to interpret 57315328Sgibbs * errors only when they occur instead of always uploading the scb. If 57415328Sgibbs * the status is SCSI_CHECK, the driver will download a new scb requesting 57515328Sgibbs * sense to replace the old one, modify the "waiting for selection" SCB list 57615328Sgibbs * and set RETURN_1 to SEND_SENSE. If RETURN_1 is set to SEND_SENSE the 57715328Sgibbs * sequencer imediately jumps to main loop where it will run down the waiting 57815328Sgibbs * SCB list and process the sense request. If the kernel driver does not 57915328Sgibbs * wish to request sense, it need only clear RETURN_1, and the command is 58015328Sgibbs * allowed to complete. We don't bother to post to the QOUTFIFO in the 58115328Sgibbs * error case since it would require extra work in the kernel driver to 58215328Sgibbs * ensure that the entry was removed before the command complete code tried 58315328Sgibbs * processing it. 58413177Sgibbs * 58513177Sgibbs * First check for residuals 58613177Sgibbs */ 58713177Sgibbs test SCB_RESID_SGCNT,0xff jz check_status 58813177Sgibbs/* 58913177Sgibbs * If we have a residual count, interrupt and tell the host. Other 59013177Sgibbs * alternatives are to pause the sequencer on all command completes (yuck), 59113177Sgibbs * dma the resid directly to the host (slick, we may have space to do it now) 59213177Sgibbs * or have the sequencer pause itself when it encounters a non-zero resid 59313177Sgibbs * (unecessary pause just to flag the command -yuck-, but takes one instruction 59413177Sgibbs * and since it shouldn't happen that often is good enough for our purposes). 59513177Sgibbs */ 59613177Sgibbsresid: 59713177Sgibbs mvi INTSTAT,RESIDUAL 5984568Sgibbs 5997532Sgibbscheck_status: 60013177Sgibbs test SCB_TARGET_STATUS,0xff jz status_ok /* Good Status? */ 60113177Sgibbs mvi INTSTAT,BAD_STATUS /* let driver know */ 60213177Sgibbs cmp RETURN_1, SEND_SENSE jne status_ok 6039954Sgibbs jmp mesgin_done 6045326Sgibbs 6054568Sgibbsstatus_ok: 60613177Sgibbs/* First, mark this target as free. */ 60713177Sgibbs test SCB_CONTROL,TAG_ENB jnz test_immediate /* 60813177Sgibbs * Tagged commands 60913177Sgibbs * don't busy the 61013177Sgibbs * target. 61113177Sgibbs */ 61213177Sgibbs mov FUNCTION1,SCB_TCL 6135326Sgibbs mov A,FUNCTION1 61413177Sgibbs test SCB_TCL,0x88 jz clear_a 6155326Sgibbs xor ACTIVE_B,A 61613177Sgibbs jmp test_immediate 6175326Sgibbs 6185326Sgibbsclear_a: 6195326Sgibbs xor ACTIVE_A,A 6205326Sgibbs 62113177Sgibbstest_immediate: 62213177Sgibbs test SCB_CMDLEN,0xff jnz complete /* Immediate message complete */ 62313177Sgibbs/* 62413177Sgibbs * Pause the sequencer until the driver gets around to handling the command 62513177Sgibbs * complete. This is so that any action that might require carefull timing 62613177Sgibbs * with the completion of this command can occur. 62713177Sgibbs */ 6289810Sgibbs mvi INTSTAT,IMMEDDONE 62913177Sgibbs jmp start 6305326Sgibbscomplete: 63115328Sgibbs mov QOUTFIFO,SCB_TAG 6327532Sgibbs mvi INTSTAT,CMDCMPLT 6339954Sgibbs jmp mesgin_done 6344568Sgibbs 6357532Sgibbs 63613177Sgibbs/* 63713177Sgibbs * Is it an extended message? We only support the synchronous and wide data 63813177Sgibbs * transfer request messages, which will probably be in response to 63913177Sgibbs * WDTR or SDTR message outs from us. If it's not SDTR or WDTR, reject it - 64013177Sgibbs * apparently this can be done after any message in byte, according 64113177Sgibbs * to the SCSI-2 spec. 64213177Sgibbs */ 6439954Sgibbsmesgin_extended: 64413177Sgibbs mvi ARG_1 call inb_next /* extended message length */ 64515328Sgibbs mvi REJBYTE_EXT call inb_next /* extended message code */ 6464568Sgibbs 64715328Sgibbs cmp REJBYTE_EXT,MSG_SDTR je p_mesginSDTR 64815328Sgibbs cmp REJBYTE_EXT,MSG_WDTR je p_mesginWDTR 6499954Sgibbs jmp rej_mesgin 6505562Sgibbs 6515562Sgibbsp_mesginWDTR: 65213177Sgibbs cmp ARG_1,2 jne rej_mesgin /* extended mesg length=2 */ 65313177Sgibbs mvi ARG_1 call inb_next /* Width of bus */ 65413177Sgibbs mvi INTSTAT,WDTR_MSG /* let driver know */ 65513177Sgibbs test RETURN_1,0xff jz mesgin_done /* Do we need to send WDTR? */ 65613177Sgibbs cmp RETURN_1,SEND_REJ je rej_mesgin /* 65713177Sgibbs * Bus width was too large 65813177Sgibbs * Reject it. 65913177Sgibbs */ 6605562Sgibbs 66113177Sgibbs/* We didn't initiate the wide negotiation, so we must respond to the request */ 66213177Sgibbs and RETURN_1,0x7f /* Clear the SEND_WDTR Flag */ 66313177Sgibbs mvi DINDEX,MSG0 66413177Sgibbs mvi MSG0 call mk_wdtr /* build WDTR message */ 66513690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 6669954Sgibbs jmp mesgin_done 6675562Sgibbs 6685562Sgibbsp_mesginSDTR: 66913177Sgibbs cmp ARG_1,3 jne rej_mesgin /* extended mesg length=3 */ 67013177Sgibbs mvi ARG_1 call inb_next /* xfer period */ 67113177Sgibbs mvi A call inb_next /* REQ/ACK offset */ 67213177Sgibbs mvi INTSTAT,SDTR_MSG /* call driver to convert */ 6734568Sgibbs 67413177Sgibbs test RETURN_1,0xff jz mesgin_done /* Do we need to mk_sdtr/rej */ 67513177Sgibbs cmp RETURN_1,SEND_REJ je rej_mesgin /* 67613177Sgibbs * Requested SDTR too small 67713177Sgibbs * Reject it. 67813177Sgibbs */ 67915328Sgibbs clr ARG_1 /* Use the scratch ram rate */ 68013177Sgibbs mvi DINDEX, MSG0 68113177Sgibbs mvi MSG0 call mk_sdtr 68213690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 6839954Sgibbs jmp mesgin_done 6844568Sgibbs 68513177Sgibbs/* 68613177Sgibbs * Is it a disconnect message? Set a flag in the SCB to remind us 68713177Sgibbs * and await the bus going free. 68813177Sgibbs */ 6899954Sgibbsmesgin_disconnect: 69013177Sgibbs or SCB_CONTROL,DISCONNECTED 69115328Sgibbs test FLAGS, PAGESCBS jz mesgin_done 69215328Sgibbs/* 69315328Sgibbs * Link this SCB into the DISCONNECTED list. This list holds the 69415328Sgibbs * candidates for paging out an SCB if one is needed for a new command. 69515328Sgibbs * Modifying the disconnected list is a critical(pause dissabled) section. 69615328Sgibbs */ 69715328Sgibbs mvi SCB_PREV, SCB_LIST_NULL 69815328Sgibbs mvi SEQCTL,0x50 /* PAUSEDIS|FASTMODE */ 69915328Sgibbs mov SCB_NEXT, DISCONNECTED_SCBH 70015328Sgibbs mov DISCONNECTED_SCBH, SCBPTR 70115328Sgibbs cmp SCB_NEXT,SCB_LIST_NULL je linkdone 70215328Sgibbs mov SCBPTR,SCB_NEXT 70315328Sgibbs mov SCB_PREV,DISCONNECTED_SCBH 70415328Sgibbs mov SCBPTR,DISCONNECTED_SCBH 70515328Sgibbslinkdone: 70615328Sgibbs mvi SEQCTL,0x10 /* !PAUSEDIS|FASTMODE */ 7079954Sgibbs jmp mesgin_done 7084568Sgibbs 70913177Sgibbs/* 71013177Sgibbs * Save data pointers message? Copy working values into the SCB, 71113177Sgibbs * usually in preparation for a disconnect. 71213177Sgibbs */ 7139954Sgibbsmesgin_sdptrs: 7144568Sgibbs call sg_ram2scb 7159954Sgibbs jmp mesgin_done 7164568Sgibbs 71713177Sgibbs/* 71813177Sgibbs * Restore pointers message? Data pointers are recopied from the 71913177Sgibbs * SCB anytime we enter a data phase for the first time, so all 72013177Sgibbs * we need to do is clear the DPHASE flag and let the data phase 72113177Sgibbs * code do the rest. 72213177Sgibbs */ 7239954Sgibbsmesgin_rdptrs: 72415328Sgibbs and FLAGS,0xef /* 72513177Sgibbs * !DPHASE we'll reload them 72613177Sgibbs * the next time through 72713177Sgibbs */ 7289954Sgibbs jmp mesgin_done 7294568Sgibbs 73013177Sgibbs/* 73113177Sgibbs * Identify message? For a reconnecting target, this tells us the lun 73213177Sgibbs * that the reconnection is for - find the correct SCB and switch to it, 73313177Sgibbs * clearing the "disconnected" bit so we don't "find" it by accident later. 73413177Sgibbs */ 7359954Sgibbsmesgin_identify: 73613177Sgibbs test A,0x78 jnz rej_mesgin /*!DiscPriv|!LUNTAR|!Reserved*/ 7374568Sgibbs 73813177Sgibbs and A,0x07 /* lun in lower three bits */ 7396608Sgibbs or SAVED_TCL,A,SELID 7406608Sgibbs and SAVED_TCL,0xf7 74113177Sgibbs and A,SELBUSB,SBLKCTL /* B Channel?? */ 7426608Sgibbs or SAVED_TCL,A 74313177Sgibbs call inb_last /* ACK */ 74413177Sgibbs 74513177Sgibbs/* 74613177Sgibbs * Here we "snoop" the bus looking for a SIMPLE QUEUE TAG message. 74715328Sgibbs * If we get one, we use the tag returned to switch to find the proper 74815328Sgibbs * SCB. With SCB paging, this requires using findSCB for both tagged 74915328Sgibbs * and non-tagged transactions since the SCB may exist in any slot. 75015328Sgibbs * If we're not using SCB paging, we can use the tag as the direct 75115328Sgibbs * index to the SCB. 75213177Sgibbs */ 75315328Sgibbs mvi ARG_1,SCB_LIST_NULL /* Default to no-tag */ 75413177Sgibbssnoop_tag_loop: 75513177Sgibbs test SSTAT1,BUSFREE jnz use_findSCB 75613177Sgibbs test SSTAT1,REQINIT jz snoop_tag_loop 75713177Sgibbs test SSTAT1,PHASEMIS jnz use_findSCB 75813177Sgibbs mvi A call inb_first 75915328Sgibbs cmp A,MSG_SIMPLE_TAG jne use_findSCB 7606608Sgibbsget_tag: 76113177Sgibbs mvi ARG_1 call inb_next /* tag value */ 76213177Sgibbs/* 76313177Sgibbs * See if the tag is in range. The tag is < SCBCOUNT if we add 76413177Sgibbs * the complement of SCBCOUNT to the incomming tag and there is 76513177Sgibbs * no carry. 76613177Sgibbs */ 76713177Sgibbs mov A,COMP_SCBCOUNT 76813177Sgibbs add SINDEX,A,ARG_1 76913177Sgibbs jc abort_tag 77013177Sgibbs 77113177Sgibbs/* 77215328Sgibbs * Ensure that the SCB the tag points to is for an SCB transaction 77313177Sgibbs * to the reconnecting target. 77413177Sgibbs */ 77515328Sgibbs test FLAGS, PAGESCBS jz index_by_tag 77615328Sgibbs call inb_last /* Ack Tag */ 77715328Sgibbsuse_findSCB: 77815328Sgibbs mov ALLZEROS call findSCB /* Have to search */ 77915328Sgibbssetup_SCB: 78015328Sgibbs and SCB_CONTROL,0xfb /* clear disconnect bit in SCB */ 78115328Sgibbs or FLAGS,IDENTIFY_SEEN /* make note of IDENTIFY */ 78215328Sgibbs jmp ITloop 78315328Sgibbsindex_by_tag: 78413177Sgibbs mov SCBPTR,ARG_1 7856608Sgibbs mov A,SAVED_TCL 78613177Sgibbs cmp SCB_TCL,A jne abort_tag 78713177Sgibbs test SCB_CONTROL,TAG_ENB jz abort_tag 78813177Sgibbs call inb_last /* Ack Successful tag */ 78913177Sgibbs jmp setup_SCB 79015328Sgibbs 7917700Sgibbsabort_tag: 79213690Sgibbs or SCSISIGO,ATNO /* turn on ATNO */ 79313177Sgibbs mvi INTSTAT,ABORT_TAG /* let driver know */ 79415328Sgibbs mvi MSG_ABORT_TAG call mk_mesg /* ABORT TAG message */ 79513177Sgibbs jmp mesgin_done 7966608Sgibbs 79713177Sgibbs/* 79813177Sgibbs * Message reject? Let the kernel driver handle this. If we have an 79913177Sgibbs * outstanding WDTR or SDTR negotiation, assume that it's a response from 80013177Sgibbs * the target selecting 8bit or asynchronous transfer, otherwise just ignore 80113177Sgibbs * it since we have no clue what it pertains to. 80213177Sgibbs */ 8039954Sgibbsmesgin_reject: 80413177Sgibbs mvi INTSTAT, REJECT_MSG 8059954Sgibbs jmp mesgin_done 8065562Sgibbs 80713177Sgibbs/* 80813177Sgibbs * [ ADD MORE MESSAGE HANDLING HERE ] 80913177Sgibbs */ 8104568Sgibbs 81113177Sgibbs/* 81213177Sgibbs * Bus free phase. It might be useful to interrupt the device 81313177Sgibbs * driver if we aren't expecting this. For now, make sure that 81413177Sgibbs * ATN isn't being asserted and look for a new command. 81513177Sgibbs */ 8164568Sgibbsp_busfree: 81713177Sgibbs mvi CLRSINT1,CLRATNO 81814449Sgibbs clr LASTPHASE 8198567Sdg 82013177Sgibbs/* 82113177Sgibbs * if this is an immediate command, perform a psuedo command complete to 82213177Sgibbs * notify the driver. 82313177Sgibbs */ 82413177Sgibbs test SCB_CMDLEN,0xff jz status_ok 82513177Sgibbs jmp start 8264568Sgibbs 82713177Sgibbs/* 82813177Sgibbs * Locking the driver out, build a one-byte message passed in SINDEX 82913177Sgibbs * if there is no active message already. SINDEX is returned intact. 83013177Sgibbs */ 8314568Sgibbsmk_mesg: 83213177Sgibbs mvi SEQCTL,0x50 /* PAUSEDIS|FASTMODE */ 83313177Sgibbs test MSG_LEN,0xff jz mk_mesg1 /* Should always succeed */ 83413177Sgibbs 83513177Sgibbs /* 83613177Sgibbs * Hmmm. For some reason the mesg buffer is in use. 83713177Sgibbs * Tell the driver. It should look at SINDEX to find 83813177Sgibbs * out what we wanted to use the buffer for and resolve 83913177Sgibbs * the conflict. 84013177Sgibbs */ 84113177Sgibbs mvi SEQCTL,0x10 /* !PAUSEDIS|FASTMODE */ 84213690Sgibbs mvi INTSTAT,MSG_BUFFER_BUSY 8434568Sgibbs 8444568Sgibbsmk_mesg1: 84513177Sgibbs mvi MSG_LEN,1 /* length = 1 */ 84613177Sgibbs mov MSG0,SINDEX /* 1-byte message */ 84713177Sgibbs mvi SEQCTL,0x10 ret /* !PAUSEDIS|FASTMODE */ 8484568Sgibbs 84913177Sgibbs/* 85013177Sgibbs * Functions to read data in Automatic PIO mode. 85113177Sgibbs * 85213177Sgibbs * According to Adaptec's documentation, an ACK is not sent on input from 85313177Sgibbs * the target until SCSIDATL is read from. So we wait until SCSIDATL is 85413177Sgibbs * latched (the usual way), then read the data byte directly off the bus 85513177Sgibbs * using SCSIBUSL. When we have pulled the ATN line, or we just want to 85613177Sgibbs * acknowledge the byte, then we do a dummy read from SCISDATL. The SCSI 85713177Sgibbs * spec guarantees that the target will hold the data byte on the bus until 85813177Sgibbs * we send our ACK. 85913177Sgibbs * 86013177Sgibbs * The assumption here is that these are called in a particular sequence, 86113177Sgibbs * and that REQ is already set when inb_first is called. inb_{first,next} 86213177Sgibbs * use the same calling convention as inb. 86313177Sgibbs */ 86413177Sgibbs 86513177Sgibbsinb_next: 86613386Sgibbs or CLRSINT0, CLRSPIORDY 86713360Sgibbs mov NONE,SCSIDATL /*dummy read from latch to ACK*/ 86813360Sgibbsinb_next_wait: 86915951Sgibbs test SSTAT0,SPIORDY jz inb_next_wait /* wait for next byte */ 87013360Sgibbs test SSTAT1,PHASEMIS jnz mesgin_phasemis 87113313Sgibbsinb_first: 8724568Sgibbs mov DINDEX,SINDEX 87313177Sgibbs mov DINDIR,SCSIBUSL ret /*read byte directly from bus*/ 87413177Sgibbsinb_last: 87513360Sgibbs mov NONE,SCSIDATL ret /*dummy read from latch to ACK*/ 8764568Sgibbs 87713177Sgibbsmesgin_phasemis: 87813177Sgibbs/* 87913177Sgibbs * We expected to receive another byte, but the target changed phase 88013177Sgibbs */ 88113177Sgibbs mvi INTSTAT, MSGIN_PHASEMIS 88213177Sgibbs jmp ITloop 8834568Sgibbs 88413177Sgibbs/* 88513177Sgibbs * DMA data transfer. HADDR and HCNT must be loaded first, and 88613177Sgibbs * SINDEX should contain the value to load DFCNTRL with - 0x3d for 88713177Sgibbs * host->scsi, or 0x39 for scsi->host. The SCSI channel is cleared 88813177Sgibbs * during initialization. 88913177Sgibbs */ 8904568Sgibbsdma: 8914568Sgibbs mov DFCNTRL,SINDEX 8924568Sgibbsdma1: 89313177Sgibbs test SSTAT0,DMADONE jnz dma3 89413177Sgibbs test SSTAT1,PHASEMIS jz dma1 /* ie. underrun */ 8954568Sgibbs 89613177Sgibbs/* 89713177Sgibbs * We will be "done" DMAing when the transfer count goes to zero, or 89813177Sgibbs * the target changes the phase (in light of this, it makes sense that 89913177Sgibbs * the DMA circuitry doesn't ACK when PHASEMIS is active). If we are 90013177Sgibbs * doing a SCSI->Host transfer, the data FIFO should be flushed auto- 90113177Sgibbs * magically on STCNT=0 or a phase change, so just wait for FIFO empty 90213177Sgibbs * status. 90313177Sgibbs */ 9044568Sgibbsdma3: 90513177Sgibbs test SINDEX,DIRECTION jnz dma5 9064568Sgibbsdma4: 90713177Sgibbs test DFSTATUS,FIFOEMP jz dma4 9084568Sgibbs 90913177Sgibbs/* 91013177Sgibbs * Now shut the DMA enables off and make sure that the DMA enables are 91113177Sgibbs * actually off first lest we get an ILLSADDR. 91213177Sgibbs */ 9134568Sgibbsdma5: 91413177Sgibbs /* disable DMA, but maintain WIDEODD */ 91513690Sgibbs and DFCNTRL,WIDEODD 9164568Sgibbsdma6: 91713177Sgibbs test DFCNTRL,0x38 jnz dma6 /* SCSIENACK|SDMAENACK|HDMAENACK */ 9184568Sgibbs 9194568Sgibbs ret 9204568Sgibbs 92113177Sgibbs/* 92213177Sgibbs * Common SCSI initialization for selection and reselection. Expects 92313177Sgibbs * the target SCSI ID to be in the upper four bits of SINDEX, and A's 92413177Sgibbs * contents are stomped on return. 92513177Sgibbs */ 9268104Sgibbsinitialize_scsiid: 92713177Sgibbs and SINDEX,0xf0 /* Get target ID */ 9285775Sgibbs and A,0x0f,SCSIID 9295775Sgibbs or SINDEX,A 9308104Sgibbs mov SCSIID,SINDEX ret 9315326Sgibbs 93213177Sgibbs/* 93313177Sgibbs * Assert that if we've been reselected, then we've seen an IDENTIFY 93413177Sgibbs * message. 93513177Sgibbs */ 9364568Sgibbsassert: 93713177Sgibbs test FLAGS,RESELECTED jz return /* reselected? */ 93813177Sgibbs test FLAGS,IDENTIFY_SEEN jnz return /* seen IDENTIFY? */ 9394568Sgibbs 94013177Sgibbs mvi INTSTAT,NO_IDENT ret /* no - cause a kernel panic */ 9414568Sgibbs 94213177Sgibbs/* 94315328Sgibbs * Locate the SCB matching the target ID/channel/lun in SAVED_TCL, and the tag 94415328Sgibbs * value in ARG_1. If ARG_1 == SCB_LIST_NULL, we're looking for a non-tagged 94515328Sgibbs * SCB. Have the kernel print a warning message if it can't be found, and 94615328Sgibbs * generate an ABORT/ABORT_TAG message to the target. SINDEX should be 94713177Sgibbs * cleared on call. 94813177Sgibbs */ 9494568SgibbsfindSCB: 9506608Sgibbs mov A,SAVED_TCL 95115328Sgibbs mov SCBPTR,SINDEX /* switch to next SCB */ 95215328Sgibbs mvi SEQCTL,0x50 /* PAUSEDIS|FASTMODE */ 95313177Sgibbs cmp SCB_TCL,A jne findSCB1 /* target ID/channel/lun match? */ 95413177Sgibbs test SCB_CONTROL,DISCONNECTED jz findSCB1 /*should be disconnected*/ 95515328Sgibbs test SCB_CONTROL,TAG_ENB jnz findTaggedSCB 95615328Sgibbs cmp ARG_1,SCB_LIST_NULL je foundSCB 95715328Sgibbs jmp findSCB1 95815328SgibbsfindTaggedSCB: 95915328Sgibbs mov A, ARG_1 /* Tag passed in ARG_1 */ 96015328Sgibbs cmp SCB_TAG,A jne findSCB1 /* Found it? */ 96115328SgibbsfoundSCB: 96215328Sgibbs test FLAGS,PAGESCBS jz foundSCB_ret 96315328Sgibbs/* Remove this SCB from the disconnection list */ 96415328Sgibbs cmp SCB_NEXT,SCB_LIST_NULL je unlink_prev 96515328Sgibbs mov SAVED_LINKPTR, SCB_PREV 96615328Sgibbs mov SCBPTR, SCB_NEXT 96715328Sgibbs mov SCB_PREV, SAVED_LINKPTR 96815328Sgibbs mov SCBPTR, SINDEX 96915328Sgibbsunlink_prev: 97015328Sgibbs cmp SCB_PREV,SCB_LIST_NULL je rHead/* At the head of the list */ 97115328Sgibbs mov SAVED_LINKPTR, SCB_NEXT 97215328Sgibbs mov SCBPTR, SCB_PREV 97315328Sgibbs mov SCB_NEXT, SAVED_LINKPTR 97415328Sgibbs mov SCBPTR, SINDEX 97515328Sgibbs mvi SEQCTL,0x10 ret /* !PAUSEDIS|FASTMODE */ 97615328SgibbsrHead: 97715328Sgibbs mov DISCONNECTED_SCBH,SCB_NEXT 97815328SgibbsfoundSCB_ret: 97915328Sgibbs mvi SEQCTL,0x10 ret /* !PAUSEDIS|FASTMODE */ 9804568Sgibbs 9816608SgibbsfindSCB1: 98215328Sgibbs mvi SEQCTL,0x10 /* !PAUSEDIS|FASTMODE */ 9834568Sgibbs inc SINDEX 9844568Sgibbs mov A,SCBCOUNT 9856608Sgibbs cmp SINDEX,A jne findSCB 9864568Sgibbs 98713177Sgibbs mvi INTSTAT,NO_MATCH /* not found - signal kernel */ 98815328Sgibbs cmp RETURN_1,SCB_PAGEDIN je return 98915328Sgibbs or SCSISIGO,ATNO /* assert ATNO */ 99015328Sgibbs cmp ARG_1,SCB_LIST_NULL jne find_abort_tag 99115328Sgibbs mvi MSG_ABORT call mk_mesg 99215328Sgibbs jmp ITloop 99315328Sgibbsfind_abort_tag: 99415328Sgibbs mvi MSG_ABORT_TAG call mk_mesg 99515328Sgibbs jmp ITloop 9964568Sgibbs 99713177Sgibbs/* 99813177Sgibbs * Make a working copy of the scatter-gather parameters from the SCB. 99913177Sgibbs */ 10004568Sgibbssg_scb2ram: 100113690Sgibbs mov HADDR0, SCB_DATAPTR0 100213690Sgibbs mov HADDR1, SCB_DATAPTR1 100313690Sgibbs mov HADDR2, SCB_DATAPTR2 100413690Sgibbs mov HADDR3, SCB_DATAPTR3 100513690Sgibbs mov HCNT0, SCB_DATACNT0 100613690Sgibbs mov HCNT1, SCB_DATACNT1 100713690Sgibbs mov HCNT2, SCB_DATACNT2 10089928Sgibbs 100913690Sgibbs mov STCNT0, HCNT0 101013690Sgibbs mov STCNT1, HCNT1 101113690Sgibbs mov STCNT2, HCNT2 10129928Sgibbs 101313177Sgibbs mov SG_COUNT,SCB_SGCOUNT 10144568Sgibbs 101513690Sgibbs mov SG_NEXT0, SCB_SGPTR0 101613690Sgibbs mov SG_NEXT1, SCB_SGPTR1 101713690Sgibbs mov SG_NEXT2, SCB_SGPTR2 101813690Sgibbs mov SG_NEXT3, SCB_SGPTR3 ret 10194568Sgibbs 102013177Sgibbs/* 102113177Sgibbs * Copying RAM values back to SCB, for Save Data Pointers message, but 102213177Sgibbs * only if we've actually been into a data phase to change them. This 102313177Sgibbs * protects against bogus data in scratch ram and the residual counts 102413177Sgibbs * since they are only initialized when we go into data_in or data_out. 102513177Sgibbs */ 10264568Sgibbssg_ram2scb: 10279928Sgibbs test FLAGS, DPHASE jz return 102813177Sgibbs mov SCB_SGCOUNT,SG_COUNT 10294568Sgibbs 103013690Sgibbs mov SCB_SGPTR0,SG_NEXT0 103113690Sgibbs mov SCB_SGPTR1,SG_NEXT1 103213690Sgibbs mov SCB_SGPTR2,SG_NEXT2 103313690Sgibbs mov SCB_SGPTR3,SG_NEXT3 10349928Sgibbs 103513690Sgibbs mov SCB_DATAPTR0,SHADDR0 103613690Sgibbs mov SCB_DATAPTR1,SHADDR1 103713690Sgibbs mov SCB_DATAPTR2,SHADDR2 103813690Sgibbs mov SCB_DATAPTR3,SHADDR3 10394568Sgibbs 104013177Sgibbs/* 104113177Sgibbs * Use the residual number since STCNT is corrupted by any message transfer 104213177Sgibbs */ 104313690Sgibbs mov SCB_DATACNT0,SCB_RESID_DCNT0 104413690Sgibbs mov SCB_DATACNT1,SCB_RESID_DCNT1 104513690Sgibbs mov SCB_DATACNT2,SCB_RESID_DCNT2 ret 10464568Sgibbs 104713177Sgibbs/* 104813177Sgibbs * Add the array base TARG_SCRATCH to the target offset (the target address 104913177Sgibbs * is in SCSIID), and return the result in SINDEX. The accumulator 105013177Sgibbs * contains the 3->8 decoding of the target ID on return. 105113177Sgibbs */ 10525562Sgibbsndx_dtr: 10534568Sgibbs shr A,SCSIID,4 105413177Sgibbs test SBLKCTL,SELBUSB jz ndx_dtr_2 105513177Sgibbs or A,0x08 /* Channel B entries add 8 */ 10565562Sgibbsndx_dtr_2: 105713690Sgibbs add SINDEX,TARG_SCRATCH,A ret 10584568Sgibbs 105913177Sgibbs/* 106013177Sgibbs * If we need to negotiate transfer parameters, build the WDTR or SDTR message 106113177Sgibbs * starting at the address passed in SINDEX. DINDEX is modified on return. 106213177Sgibbs * The SCSI-II spec requires that Wide negotiation occur first and you can 106313177Sgibbs * only negotiat one or the other at a time otherwise in the event of a message 106413177Sgibbs * reject, you wouldn't be able to tell which message was the culpret. 106513177Sgibbs */ 10665562Sgibbsmk_dtr: 106713177Sgibbs test SCB_CONTROL,NEEDWDTR jnz mk_wdtr_16bit 106815328Sgibbs mvi ARG_1, MAXOFFSET /* Force an offset of 15 or 8 if WIDE */ 10694568Sgibbs 10707532Sgibbsmk_sdtr: 107113177Sgibbs mvi DINDIR,1 /* extended message */ 107213177Sgibbs mvi DINDIR,3 /* extended message length = 3 */ 107313177Sgibbs mvi DINDIR,1 /* SDTR code */ 10747532Sgibbs call sdtr_to_rate 107513177Sgibbs mov DINDIR,RETURN_1 /* REQ/ACK transfer period */ 107615328Sgibbs cmp ARG_1, MAXOFFSET je mk_sdtr_max_offset 107713177Sgibbs and DINDIR,0x0f,SINDIR /* Sync Offset */ 10787532Sgibbs 10797532Sgibbsmk_sdtr_done: 108013177Sgibbs add MSG_LEN,COMP_MSG0,DINDEX ret /* update message length */ 10817532Sgibbs 10828567Sdgmk_sdtr_max_offset: 108313177Sgibbs/* 108413177Sgibbs * We're initiating sync negotiation, so request the max offset we can (15 or 8) 108513177Sgibbs */ 108613177Sgibbs /* Talking to a WIDE device? */ 108713177Sgibbs test SCSIRATE, WIDEXFER jnz wmax_offset 10888567Sdg mvi DINDIR, MAX_OFFSET_8BIT 10897532Sgibbs jmp mk_sdtr_done 10907532Sgibbs 10918567Sdgwmax_offset: 109213177Sgibbs mvi DINDIR, MAX_OFFSET_16BIT 10938567Sdg jmp mk_sdtr_done 10948567Sdg 10955647Sgibbsmk_wdtr_16bit: 10965647Sgibbs mvi ARG_1,BUS_16_BIT 10975562Sgibbsmk_wdtr: 109813177Sgibbs mvi DINDIR,1 /* extended message */ 109913177Sgibbs mvi DINDIR,2 /* extended message length = 2 */ 110013177Sgibbs mvi DINDIR,3 /* WDTR code */ 110113177Sgibbs mov DINDIR,ARG_1 /* bus width */ 11025562Sgibbs 110313177Sgibbs add MSG_LEN,COMP_MSG0,DINDEX ret /* update message length */ 11045562Sgibbs 11055562Sgibbssdtr_to_rate: 110613177Sgibbs call ndx_dtr /* index scratch space for target */ 11075562Sgibbs shr A,SINDIR,0x4 110813177Sgibbs dec SINDEX /* Preserve SINDEX */ 11095562Sgibbs and A,0x7 11105562Sgibbs clr RETURN_1 11115562Sgibbssdtr_to_rate_loop: 11125562Sgibbs test A,0x0f jz sdtr_to_rate_done 111313177Sgibbs add RETURN_1,0x19 11145562Sgibbs dec A 11155562Sgibbs jmp sdtr_to_rate_loop 11165562Sgibbssdtr_to_rate_done: 11175562Sgibbs shr RETURN_1,0x2 111813177Sgibbs add RETURN_1,0x19 111911829Sgibbs test SXFRCTL0,ULTRAEN jz return 112011829Sgibbs shr RETURN_1,0x1 11217532Sgibbsreturn: 11227532Sgibbs ret 1123