diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/scsi/aic7xxx/aic79xx.seq |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/scsi/aic7xxx/aic79xx.seq')
-rw-r--r-- | drivers/scsi/aic7xxx/aic79xx.seq | 2058 |
1 files changed, 2058 insertions, 0 deletions
diff --git a/drivers/scsi/aic7xxx/aic79xx.seq b/drivers/scsi/aic7xxx/aic79xx.seq new file mode 100644 index 000000000000..65339bc1ca99 --- /dev/null +++ b/drivers/scsi/aic7xxx/aic79xx.seq @@ -0,0 +1,2058 @@ +/* + * Adaptec U320 device driver firmware for Linux and FreeBSD. + * + * Copyright (c) 1994-2001 Justin T. Gibbs. + * Copyright (c) 2000-2002 Adaptec Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * substantially similar to the "NO WARRANTY" disclaimer below + * ("Disclaimer") and any redistribution must be conditioned upon + * including a substantially similar Disclaimer requirement for further + * binary redistribution. + * 3. Neither the names of the above-listed copyright holders nor the names + * of any contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * NO WARRANTY + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGES. + * + * $FreeBSD$ + */ + +VERSION = "$Id: //depot/aic7xxx/aic7xxx/aic79xx.seq#99 $" +PATCH_ARG_LIST = "struct ahd_softc *ahd" +PREFIX = "ahd_" + +#include "aic79xx.reg" +#include "scsi_message.h" + +restart: +if ((ahd->bugs & AHD_INTCOLLISION_BUG) != 0) { + test SEQINTCODE, 0xFF jz idle_loop; + SET_SEQINTCODE(NO_SEQINT) +} + +idle_loop: + + if ((ahd->bugs & AHD_INTCOLLISION_BUG) != 0) { + /* + * Convert ERROR status into a sequencer + * interrupt to handle the case of an + * interrupt collision on the hardware + * setting of HWERR. + */ + test ERROR, 0xFF jz no_error_set; + SET_SEQINTCODE(SAW_HWERR) +no_error_set: + } + SET_MODE(M_SCSI, M_SCSI) + test SCSISEQ0, ENSELO|ENARBO jnz idle_loop_checkbus; + test SEQ_FLAGS2, SELECTOUT_QFROZEN jnz idle_loop_checkbus; + cmp WAITING_TID_HEAD[1], SCB_LIST_NULL je idle_loop_checkbus; + /* + * ENSELO is cleared by a SELDO, so we must test for SELDO + * one last time. + */ +BEGIN_CRITICAL; + test SSTAT0, SELDO jnz select_out; +END_CRITICAL; + call start_selection; +idle_loop_checkbus: +BEGIN_CRITICAL; + test SSTAT0, SELDO jnz select_out; +END_CRITICAL; + test SSTAT0, SELDI jnz select_in; + test SCSIPHASE, ~DATA_PHASE_MASK jz idle_loop_check_nonpackreq; + test SCSISIGO, ATNO jz idle_loop_check_nonpackreq; + call unexpected_nonpkt_phase_find_ctxt; +idle_loop_check_nonpackreq: + test SSTAT2, NONPACKREQ jz . + 2; + call unexpected_nonpkt_phase_find_ctxt; + if ((ahd->bugs & AHD_FAINT_LED_BUG) != 0) { + and A, FIFO0FREE|FIFO1FREE, DFFSTAT; + cmp A, FIFO0FREE|FIFO1FREE jne . + 3; + and SBLKCTL, ~DIAGLEDEN|DIAGLEDON; + jmp . + 2; + or SBLKCTL, DIAGLEDEN|DIAGLEDON; + } + call idle_loop_gsfifo_in_scsi_mode; + call idle_loop_service_fifos; + call idle_loop_cchan; + jmp idle_loop; + +BEGIN_CRITICAL; +idle_loop_gsfifo: + SET_MODE(M_SCSI, M_SCSI) +idle_loop_gsfifo_in_scsi_mode: + test LQISTAT2, LQIGSAVAIL jz return; + /* + * We have received good status for this transaction. There may + * still be data in our FIFOs draining to the host. Complete + * the SCB only if all data has transferred to the host. + */ +good_status_IU_done: + bmov SCBPTR, GSFIFO, 2; + clr SCB_SCSI_STATUS; + /* + * If a command completed before an attempted task management + * function completed, notify the host after disabling any + * pending select-outs. + */ + test SCB_TASK_MANAGEMENT, 0xFF jz gsfifo_complete_normally; + test SSTAT0, SELDO|SELINGO jnz . + 2; + and SCSISEQ0, ~ENSELO; + SET_SEQINTCODE(TASKMGMT_CMD_CMPLT_OKAY) +gsfifo_complete_normally: + or SCB_CONTROL, STATUS_RCVD; + + /* + * Since this status did not consume a FIFO, we have to + * be a bit more dilligent in how we check for FIFOs pertaining + * to this transaction. There are two states that a FIFO still + * transferring data may be in. + * + * 1) Configured and draining to the host, with a FIFO handler. + * 2) Pending cfg4data, fifo not empty. + * + * Case 1 can be detected by noticing a non-zero FIFO active + * count in the SCB. In this case, we allow the routine servicing + * the FIFO to complete the SCB. + * + * Case 2 implies either a pending or yet to occur save data + * pointers for this same context in the other FIFO. So, if + * we detect case 1, we will properly defer the post of the SCB + * and achieve the desired result. The pending cfg4data will + * notice that status has been received and complete the SCB. + */ + test SCB_FIFO_USE_COUNT, 0xFF jnz idle_loop_gsfifo_in_scsi_mode; + call complete; +END_CRITICAL; + jmp idle_loop_gsfifo_in_scsi_mode; + +idle_loop_service_fifos: + SET_MODE(M_DFF0, M_DFF0) + test LONGJMP_ADDR[1], INVALID_ADDR jnz idle_loop_next_fifo; + call longjmp; +idle_loop_next_fifo: + SET_MODE(M_DFF1, M_DFF1) + test LONGJMP_ADDR[1], INVALID_ADDR jz longjmp; +return: + ret; + +idle_loop_cchan: + SET_MODE(M_CCHAN, M_CCHAN) + test QOFF_CTLSTA, HS_MAILBOX_ACT jz hs_mailbox_empty; + or QOFF_CTLSTA, HS_MAILBOX_ACT; + mov LOCAL_HS_MAILBOX, HS_MAILBOX; +hs_mailbox_empty: +BEGIN_CRITICAL; + test CCSCBCTL, CCARREN|CCSCBEN jz scbdma_idle; + test CCSCBCTL, CCSCBDIR jnz fetch_new_scb_inprog; + test CCSCBCTL, CCSCBDONE jz return; +END_CRITICAL; + /* FALLTHROUGH */ +scbdma_tohost_done: + test CCSCBCTL, CCARREN jz fill_qoutfifo_dmadone; + /* + * An SCB has been succesfully uploaded to the host. + * If the SCB was uploaded for some reason other than + * bad SCSI status (currently only for underruns), we + * queue the SCB for normal completion. Otherwise, we + * wait until any select-out activity has halted, and + * then notify the host so that the transaction can be + * dealt with. + */ + test SCB_SCSI_STATUS, 0xff jnz scbdma_notify_host; + and CCSCBCTL, ~(CCARREN|CCSCBEN); + bmov COMPLETE_DMA_SCB_HEAD, SCB_NEXT_COMPLETE, 2; + bmov SCB_NEXT_COMPLETE, COMPLETE_SCB_HEAD, 2; + bmov COMPLETE_SCB_HEAD, SCBPTR, 2 ret; +scbdma_notify_host: + SET_MODE(M_SCSI, M_SCSI) + test SCSISEQ0, ENSELO jnz return; + test SSTAT0, (SELDO|SELINGO) jnz return; + SET_MODE(M_CCHAN, M_CCHAN) + /* + * Remove SCB and notify host. + */ + and CCSCBCTL, ~(CCARREN|CCSCBEN); + bmov COMPLETE_DMA_SCB_HEAD, SCB_NEXT_COMPLETE, 2; + SET_SEQINTCODE(BAD_SCB_STATUS) + ret; +fill_qoutfifo_dmadone: + and CCSCBCTL, ~(CCARREN|CCSCBEN); + call qoutfifo_updated; + mvi COMPLETE_SCB_DMAINPROG_HEAD[1], SCB_LIST_NULL; + bmov QOUTFIFO_NEXT_ADDR, SCBHADDR, 4; + test QOFF_CTLSTA, SDSCB_ROLLOVR jz return; + bmov QOUTFIFO_NEXT_ADDR, SHARED_DATA_ADDR, 4; + xor QOUTFIFO_ENTRY_VALID_TAG, QOUTFIFO_ENTRY_VALID_TOGGLE ret; + +qoutfifo_updated: + /* + * If there are more commands waiting to be dma'ed + * to the host, always coalesce. Otherwise honor the + * host's wishes. + */ + cmp COMPLETE_DMA_SCB_HEAD[1], SCB_LIST_NULL jne coalesce_by_count; + cmp COMPLETE_SCB_HEAD[1], SCB_LIST_NULL jne coalesce_by_count; + test LOCAL_HS_MAILBOX, ENINT_COALESCE jz issue_cmdcmplt; + + /* + * If we have relatively few commands outstanding, don't + * bother waiting for another command to complete. + */ + test CMDS_PENDING[1], 0xFF jnz coalesce_by_count; + /* Add -1 so that jnc means <= not just < */ + add A, -1, INT_COALESCING_MINCMDS; + add NONE, A, CMDS_PENDING; + jnc issue_cmdcmplt; + + /* + * If coalescing, only coalesce up to the limit + * provided by the host driver. + */ +coalesce_by_count: + mov A, INT_COALESCING_MAXCMDS; + add NONE, A, INT_COALESCING_CMDCOUNT; + jc issue_cmdcmplt; + /* + * If the timer is not currently active, + * fire it up. + */ + test INTCTL, SWTMINTMASK jz return; + bmov SWTIMER, INT_COALESCING_TIMER, 2; + mvi CLRSEQINTSTAT, CLRSEQ_SWTMRTO; + or INTCTL, SWTMINTEN|SWTIMER_START; + and INTCTL, ~SWTMINTMASK ret; + +issue_cmdcmplt: + mvi INTSTAT, CMDCMPLT; + clr INT_COALESCING_CMDCOUNT; + or INTCTL, SWTMINTMASK ret; + +BEGIN_CRITICAL; +fetch_new_scb_inprog: + test CCSCBCTL, ARRDONE jz return; +fetch_new_scb_done: + and CCSCBCTL, ~(CCARREN|CCSCBEN); + bmov REG0, SCBPTR, 2; + clr A; + add CMDS_PENDING, 1; + adc CMDS_PENDING[1], A; + if ((ahd->bugs & AHD_PKT_LUN_BUG) != 0) { + /* + * "Short Luns" are not placed into outgoing LQ + * packets in the correct byte order. Use a full + * sized lun field instead and fill it with the + * one byte of lun information we support. + */ + mov SCB_PKT_LUN[6], SCB_LUN; + } + /* + * The FIFO use count field is shared with the + * tag set by the host so that our SCB dma engine + * knows the correct location to store the SCB. + * Set it to zero before processing the SCB. + */ + clr SCB_FIFO_USE_COUNT; + /* Update the next SCB address to download. */ + bmov NEXT_QUEUED_SCB_ADDR, SCB_NEXT_SCB_BUSADDR, 4; + mvi SCB_NEXT[1], SCB_LIST_NULL; + mvi SCB_NEXT2[1], SCB_LIST_NULL; + /* Increment our position in the QINFIFO. */ + mov NONE, SNSCB_QOFF; + /* + * SCBs that want to send messages are always + * queued independently. This ensures that they + * are at the head of the SCB list to select out + * to a target and we will see the MK_MESSAGE flag. + */ + test SCB_CONTROL, MK_MESSAGE jnz first_new_target_scb; + shr SINDEX, 3, SCB_SCSIID; + and SINDEX, ~0x1; + mvi SINDEX[1], (WAITING_SCB_TAILS >> 8); + bmov DINDEX, SINDEX, 2; + bmov SCBPTR, SINDIR, 2; + bmov DINDIR, REG0, 2; + cmp SCBPTR[1], SCB_LIST_NULL je first_new_target_scb; + bmov SCB_NEXT, REG0, 2 ret; +first_new_target_scb: + cmp WAITING_TID_HEAD[1], SCB_LIST_NULL je first_new_scb; + bmov SCBPTR, WAITING_TID_TAIL, 2; + bmov SCB_NEXT2, REG0, 2; + bmov WAITING_TID_TAIL, REG0, 2 ret; +first_new_scb: + bmov WAITING_TID_HEAD, REG0, 2; + bmov WAITING_TID_TAIL, REG0, 2 ret; +END_CRITICAL; + +scbdma_idle: + /* + * Give precedence to downloading new SCBs to execute + * unless select-outs are currently frozen. + */ + test SEQ_FLAGS2, SELECTOUT_QFROZEN jnz . + 2; +BEGIN_CRITICAL; + test QOFF_CTLSTA, NEW_SCB_AVAIL jnz fetch_new_scb; + cmp COMPLETE_DMA_SCB_HEAD[1], SCB_LIST_NULL jne dma_complete_scb; + cmp COMPLETE_SCB_HEAD[1], SCB_LIST_NULL je return; + /* FALLTHROUGH */ +fill_qoutfifo: + /* + * Keep track of the SCBs we are dmaing just + * in case the DMA fails or is aborted. + */ + mov A, QOUTFIFO_ENTRY_VALID_TAG; + bmov COMPLETE_SCB_DMAINPROG_HEAD, COMPLETE_SCB_HEAD, 2; + mvi CCSCBCTL, CCSCBRESET; + bmov SCBHADDR, QOUTFIFO_NEXT_ADDR, 4; + bmov SCBPTR, COMPLETE_SCB_HEAD, 2; +fill_qoutfifo_loop: + mov CCSCBRAM, SCBPTR; + or CCSCBRAM, A, SCBPTR[1]; + mov NONE, SDSCB_QOFF; + inc INT_COALESCING_CMDCOUNT; + add CMDS_PENDING, -1; + adc CMDS_PENDING[1], -1; + cmp SCB_NEXT_COMPLETE[1], SCB_LIST_NULL je fill_qoutfifo_done; + cmp CCSCBADDR, CCSCBADDR_MAX je fill_qoutfifo_done; + test QOFF_CTLSTA, SDSCB_ROLLOVR jnz fill_qoutfifo_done; + bmov SCBPTR, SCB_NEXT_COMPLETE, 2; + jmp fill_qoutfifo_loop; +fill_qoutfifo_done: + mov SCBHCNT, CCSCBADDR; + mvi CCSCBCTL, CCSCBEN|CCSCBRESET; + bmov COMPLETE_SCB_HEAD, SCB_NEXT_COMPLETE, 2; + mvi SCB_NEXT_COMPLETE[1], SCB_LIST_NULL ret; + +fetch_new_scb: + bmov SCBHADDR, NEXT_QUEUED_SCB_ADDR, 4; + mvi CCARREN|CCSCBEN|CCSCBDIR|CCSCBRESET jmp dma_scb; +dma_complete_scb: + bmov SCBPTR, COMPLETE_DMA_SCB_HEAD, 2; + bmov SCBHADDR, SCB_BUSADDR, 4; + mvi CCARREN|CCSCBEN|CCSCBRESET jmp dma_scb; +END_CRITICAL; + +/* + * Either post or fetch an SCB from host memory. The caller + * is responsible for polling for transfer completion. + * + * Prerequisits: Mode == M_CCHAN + * SINDEX contains CCSCBCTL flags + * SCBHADDR set to Host SCB address + * SCBPTR set to SCB src location on "push" operations + */ +SET_SRC_MODE M_CCHAN; +SET_DST_MODE M_CCHAN; +dma_scb: + mvi SCBHCNT, SCB_TRANSFER_SIZE; + mov CCSCBCTL, SINDEX ret; + +BEGIN_CRITICAL; +setjmp: + bmov LONGJMP_ADDR, STACK, 2 ret; +setjmp_inline: + bmov LONGJMP_ADDR, STACK, 2; +longjmp: + bmov STACK, LONGJMP_ADDR, 2 ret; +END_CRITICAL; + +/*************************** Chip Bug Work Arounds ****************************/ +/* + * Must disable interrupts when setting the mode pointer + * register as an interrupt occurring mid update will + * fail to store the new mode value for restoration on + * an iret. + */ +if ((ahd->bugs & AHD_SET_MODE_BUG) != 0) { +set_mode_work_around: + mvi SEQINTCTL, INTVEC1DSL; + mov MODE_PTR, SINDEX; + clr SEQINTCTL ret; + +toggle_dff_mode_work_around: + mvi SEQINTCTL, INTVEC1DSL; + xor MODE_PTR, MK_MODE(M_DFF1, M_DFF1); + clr SEQINTCTL ret; +} + + +if ((ahd->bugs & AHD_INTCOLLISION_BUG) != 0) { +set_seqint_work_around: + mov SEQINTCODE, SINDEX; + mvi SEQINTCODE, NO_SEQINT ret; +} + +/************************ Packetized LongJmp Routines *************************/ +SET_SRC_MODE M_SCSI; +SET_DST_MODE M_SCSI; +start_selection: +BEGIN_CRITICAL; + if ((ahd->bugs & AHD_SENT_SCB_UPDATE_BUG) != 0) { + /* + * Razor #494 + * Rev A hardware fails to update LAST/CURR/NEXTSCB + * correctly after a packetized selection in several + * situations: + * + * 1) If only one command existed in the queue, the + * LAST/CURR/NEXTSCB are unchanged. + * + * 2) In a non QAS, protocol allowed phase change, + * the queue is shifted 1 too far. LASTSCB is + * the last SCB that was correctly processed. + * + * 3) In the QAS case, if the full list of commands + * was successfully sent, NEXTSCB is NULL and neither + * CURRSCB nor LASTSCB can be trusted. We must + * manually walk the list counting MAXCMDCNT elements + * to find the last SCB that was sent correctly. + * + * To simplify the workaround for this bug in SELDO + * handling, we initialize LASTSCB prior to enabling + * selection so we can rely on it even for case #1 above. + */ + bmov LASTSCB, WAITING_TID_HEAD, 2; + } + bmov CURRSCB, WAITING_TID_HEAD, 2; + bmov SCBPTR, WAITING_TID_HEAD, 2; + shr SELOID, 4, SCB_SCSIID; + /* + * If we want to send a message to the device, ensure + * we are selecting with atn irregardless of our packetized + * agreement. Since SPI4 only allows target reset or PPR + * messages if this is a packetized connection, the change + * to our negotiation table entry for this selection will + * be cleared when the message is acted on. + */ + test SCB_CONTROL, MK_MESSAGE jz . + 3; + mov NEGOADDR, SELOID; + or NEGCONOPTS, ENAUTOATNO; + or SCSISEQ0, ENSELO ret; +END_CRITICAL; + +/* + * Allocate a FIFO for a non-packetized transaction. + * In RevA hardware, both FIFOs must be free before we + * can allocate a FIFO for a non-packetized transaction. + */ +allocate_fifo_loop: + /* + * Do whatever work is required to free a FIFO. + */ + call idle_loop_service_fifos; + SET_MODE(M_SCSI, M_SCSI) +allocate_fifo: + if ((ahd->bugs & AHD_NONPACKFIFO_BUG) != 0) { + and A, FIFO0FREE|FIFO1FREE, DFFSTAT; + cmp A, FIFO0FREE|FIFO1FREE jne allocate_fifo_loop; + } else { + test DFFSTAT, FIFO1FREE jnz allocate_fifo1; + test DFFSTAT, FIFO0FREE jz allocate_fifo_loop; + mvi DFFSTAT, B_CURRFIFO_0; + SET_MODE(M_DFF0, M_DFF0) + bmov SCBPTR, ALLOCFIFO_SCBPTR, 2 ret; + } +SET_SRC_MODE M_SCSI; +SET_DST_MODE M_SCSI; +allocate_fifo1: + mvi DFFSTAT, CURRFIFO_1; + SET_MODE(M_DFF1, M_DFF1) + bmov SCBPTR, ALLOCFIFO_SCBPTR, 2 ret; + +/* + * We have been reselected as an initiator + * or selected as a target. + */ +SET_SRC_MODE M_SCSI; +SET_DST_MODE M_SCSI; +select_in: + if ((ahd->bugs & AHD_BUSFREEREV_BUG) != 0) { + /* + * Test to ensure that the bus has not + * already gone free prior to clearing + * any stale busfree status. This avoids + * a window whereby a busfree just after + * a selection could be missed. + */ + test SCSISIGI, BSYI jz . + 2; + mvi CLRSINT1,CLRBUSFREE; + or SIMODE1, ENBUSFREE; + } + or SXFRCTL0, SPIOEN; + and SAVED_SCSIID, SELID_MASK, SELID; + and A, OID, IOWNID; + or SAVED_SCSIID, A; + mvi CLRSINT0, CLRSELDI; + jmp ITloop; + +/* + * We have successfully selected out. + * + * Clear SELDO. + * Dequeue all SCBs sent from the waiting queue + * Requeue all SCBs *not* sent to the tail of the waiting queue + * Take Razor #494 into account for above. + * + * In Packetized Mode: + * Return to the idle loop. Our interrupt handler will take + * care of any incoming L_Qs. + * + * In Non-Packetize Mode: + * Continue to our normal state machine. + */ +SET_SRC_MODE M_SCSI; +SET_DST_MODE M_SCSI; +select_out: +BEGIN_CRITICAL; + /* Clear out all SCBs that have been successfully sent. */ + if ((ahd->bugs & AHD_SENT_SCB_UPDATE_BUG) != 0) { + /* + * For packetized, the LQO manager clears ENSELO on + * the assertion of SELDO. If we are non-packetized, + * LASTSCB and CURRSCB are accurate. + */ + test SCSISEQ0, ENSELO jnz use_lastscb; + + /* + * The update is correct for LQOSTAT1 errors. All + * but LQOBUSFREE are handled by kernel interrupts. + * If we see LQOBUSFREE, return to the idle loop. + * Once we are out of the select_out critical section, + * the kernel will cleanup the LQOBUSFREE and we will + * eventually restart the selection if appropriate. + */ + test LQOSTAT1, LQOBUSFREE jnz idle_loop; + + /* + * On a phase change oustside of packet boundaries, + * LASTSCB points to the currently active SCB context + * on the bus. + */ + test LQOSTAT2, LQOPHACHGOUTPKT jnz use_lastscb; + + /* + * If the hardware has traversed the whole list, NEXTSCB + * will be NULL, CURRSCB and LASTSCB cannot be trusted, + * but MAXCMDCNT is accurate. If we stop part way through + * the list or only had one command to issue, NEXTSCB[1] is + * not NULL and LASTSCB is the last command to go out. + */ + cmp NEXTSCB[1], SCB_LIST_NULL jne use_lastscb; + + /* + * Brute force walk. + */ + bmov SCBPTR, WAITING_TID_HEAD, 2; + mvi SEQINTCTL, INTVEC1DSL; + mvi MODE_PTR, MK_MODE(M_CFG, M_CFG); + mov A, MAXCMDCNT; + mvi MODE_PTR, MK_MODE(M_SCSI, M_SCSI); + clr SEQINTCTL; +find_lastscb_loop: + dec A; + test A, 0xFF jz found_last_sent_scb; + bmov SCBPTR, SCB_NEXT, 2; + jmp find_lastscb_loop; +use_lastscb: + bmov SCBPTR, LASTSCB, 2; +found_last_sent_scb: + bmov CURRSCB, SCBPTR, 2; +curscb_ww_done: + } else { + bmov SCBPTR, CURRSCB, 2; + } + + /* + * Requeue any SCBs not sent, to the tail of the waiting Q. + */ + cmp SCB_NEXT[1], SCB_LIST_NULL je select_out_list_done; + + /* + * We know that neither the per-TID list nor the list of + * TIDs is empty. Use this knowledge to our advantage. + */ + bmov REG0, SCB_NEXT, 2; + bmov SCBPTR, WAITING_TID_TAIL, 2; + bmov SCB_NEXT2, REG0, 2; + bmov WAITING_TID_TAIL, REG0, 2; + jmp select_out_inc_tid_q; + +select_out_list_done: + /* + * The whole list made it. Just clear our TID's tail pointer + * unless we were queued independently due to our need to + * send a message. + */ + test SCB_CONTROL, MK_MESSAGE jnz select_out_inc_tid_q; + shr DINDEX, 3, SCB_SCSIID; + or DINDEX, 1; /* Want only the second byte */ + mvi DINDEX[1], ((WAITING_SCB_TAILS) >> 8); + mvi DINDIR, SCB_LIST_NULL; +select_out_inc_tid_q: + bmov SCBPTR, WAITING_TID_HEAD, 2; + bmov WAITING_TID_HEAD, SCB_NEXT2, 2; + cmp WAITING_TID_HEAD[1], SCB_LIST_NULL jne . + 2; + mvi WAITING_TID_TAIL[1], SCB_LIST_NULL; + bmov SCBPTR, CURRSCB, 2; + mvi CLRSINT0, CLRSELDO; + test LQOSTAT2, LQOPHACHGOUTPKT jnz unexpected_nonpkt_phase; + test LQOSTAT1, LQOPHACHGINPKT jnz unexpected_nonpkt_phase; + + /* + * If this is a packetized connection, return to our + * idle_loop and let our interrupt handler deal with + * any connection setup/teardown issues. The only + * exceptions are the case of MK_MESSAGE and task management + * SCBs. + */ + if ((ahd->bugs & AHD_LQO_ATNO_BUG) != 0) { + /* + * In the A, the LQO manager transitions to LQOSTOP0 even if + * we have selected out with ATN asserted and the target + * REQs in a non-packet phase. + */ + test SCB_CONTROL, MK_MESSAGE jz select_out_no_message; + test SCSISIGO, ATNO jnz select_out_non_packetized; +select_out_no_message: + } + test LQOSTAT2, LQOSTOP0 jz select_out_non_packetized; + test SCB_TASK_MANAGEMENT, 0xFF jz idle_loop; + SET_SEQINTCODE(TASKMGMT_FUNC_COMPLETE) + jmp idle_loop; + +select_out_non_packetized: + /* Non packetized request. */ + and SCSISEQ0, ~ENSELO; + if ((ahd->bugs & AHD_BUSFREEREV_BUG) != 0) { + /* + * Test to ensure that the bus has not + * already gone free prior to clearing + * any stale busfree status. This avoids + * a window whereby a busfree just after + * a selection could be missed. + */ + test SCSISIGI, BSYI jz . + 2; + mvi CLRSINT1,CLRBUSFREE; + or SIMODE1, ENBUSFREE; + } + mov SAVED_SCSIID, SCB_SCSIID; + mov SAVED_LUN, SCB_LUN; + mvi SEQ_FLAGS, NO_CDB_SENT; +END_CRITICAL; + or SXFRCTL0, SPIOEN; + + /* + * As soon as we get a successful selection, the target + * should go into the message out phase since we have ATN + * asserted. + */ + mvi MSG_OUT, MSG_IDENTIFYFLAG; + + /* + * Main loop for information transfer phases. Wait for the + * target to assert REQ before checking MSG, C/D and I/O for + * the bus phase. + */ +mesgin_phasemis: +ITloop: + call phase_lock; + + mov A, LASTPHASE; + + test A, ~P_DATAIN_DT jz p_data; + cmp A,P_COMMAND je p_command; + cmp A,P_MESGOUT je p_mesgout; + cmp A,P_STATUS je p_status; + cmp A,P_MESGIN je p_mesgin; + + SET_SEQINTCODE(BAD_PHASE) + jmp ITloop; /* Try reading the bus again. */ + +/* + * Command phase. Set up the DMA registers and let 'er rip. + */ +p_command: + test SEQ_FLAGS, NOT_IDENTIFIED jz p_command_okay; + SET_SEQINTCODE(PROTO_VIOLATION) +p_command_okay: + test MODE_PTR, ~(MK_MODE(M_DFF1, M_DFF1)) + jnz p_command_allocate_fifo; + /* + * Command retry. Free our current FIFO and + * re-allocate a FIFO so transfer state is + * reset. + */ +SET_SRC_MODE M_DFF1; +SET_DST_MODE M_DFF1; + mvi DFFSXFRCTL, RSTCHN|CLRSHCNT; + SET_MODE(M_SCSI, M_SCSI) +p_command_allocate_fifo: + bmov ALLOCFIFO_SCBPTR, SCBPTR, 2; + call allocate_fifo; +SET_SRC_MODE M_DFF1; +SET_DST_MODE M_DFF1; + add NONE, -17, SCB_CDB_LEN; + jnc p_command_embedded; +p_command_from_host: + bmov HADDR[0], SCB_HOST_CDB_PTR, 9; + mvi SG_CACHE_PRE, LAST_SEG; + mvi DFCNTRL, (PRELOADEN|SCSIEN|HDMAEN); + jmp p_command_xfer; +p_command_embedded: + bmov SHCNT[0], SCB_CDB_LEN, 1; + bmov DFDAT, SCB_CDB_STORE, 16; + mvi DFCNTRL, SCSIEN; +p_command_xfer: + and SEQ_FLAGS, ~NO_CDB_SENT; + if ((ahd->features & AHD_FAST_CDB_DELIVERY) != 0) { + /* + * To speed up CDB delivery in Rev B, all CDB acks + * are "released" to the output sync as soon as the + * command phase starts. There is only one problem + * with this approach. If the target changes phase + * before all data are sent, we have left over acks + * that can go out on the bus in a data phase. Due + * to other chip contraints, this only happens if + * the target goes to data-in, but if the acks go + * out before we can test SDONE, we'll think that + * the transfer has completed successfully. Work + * around this by taking advantage of the 400ns or + * 800ns dead time between command phase and the REQ + * of the new phase. If the transfer has completed + * successfully, SCSIEN should fall *long* before we + * see a phase change. We thus treat any phasemiss + * that occurs before SCSIEN falls as an incomplete + * transfer. + */ + test SSTAT1, PHASEMIS jnz p_command_xfer_failed; + test DFCNTRL, SCSIEN jnz . - 1; + } else { + test DFCNTRL, SCSIEN jnz .; + } + /* + * DMA Channel automatically disabled. + * Don't allow a data phase if the command + * was not fully transferred. + */ + test SSTAT2, SDONE jnz ITloop; +p_command_xfer_failed: + or SEQ_FLAGS, NO_CDB_SENT; + jmp ITloop; + + +/* + * Status phase. Wait for the data byte to appear, then read it + * and store it into the SCB. + */ +SET_SRC_MODE M_SCSI; +SET_DST_MODE M_SCSI; +p_status: + test SEQ_FLAGS,NOT_IDENTIFIED jnz mesgin_proto_violation; +p_status_okay: + mov SCB_SCSI_STATUS, SCSIDAT; + or SCB_CONTROL, STATUS_RCVD; + jmp ITloop; + +/* + * Message out phase. If MSG_OUT is MSG_IDENTIFYFLAG, build a full + * indentify message sequence and send it to the target. The host may + * override this behavior by setting the MK_MESSAGE bit in the SCB + * control byte. This will cause us to interrupt the host and allow + * it to handle the message phase completely on its own. If the bit + * associated with this target is set, we will also interrupt the host, + * thereby allowing it to send a message on the next selection regardless + * of the transaction being sent. + * + * If MSG_OUT is == HOST_MSG, also interrupt the host and take a message. + * This is done to allow the host to send messages outside of an identify + * sequence while protecting the seqencer from testing the MK_MESSAGE bit + * on an SCB that might not be for the current nexus. (For example, a + * BDR message in responce to a bad reselection would leave us pointed to + * an SCB that doesn't have anything to do with the current target). + * + * Otherwise, treat MSG_OUT as a 1 byte message to send (abort, abort tag, + * bus device reset). + * + * When there are no messages to send, MSG_OUT should be set to MSG_NOOP, + * in case the target decides to put us in this phase for some strange + * reason. + */ +p_mesgout_retry: + /* Turn on ATN for the retry */ + mvi SCSISIGO, ATNO; +p_mesgout: + mov SINDEX, MSG_OUT; + cmp SINDEX, MSG_IDENTIFYFLAG jne p_mesgout_from_host; + test SCB_CONTROL,MK_MESSAGE jnz host_message_loop; +p_mesgout_identify: + or SINDEX, MSG_IDENTIFYFLAG|DISCENB, SCB_LUN; + test SCB_CONTROL, DISCENB jnz . + 2; + and SINDEX, ~DISCENB; +/* + * Send a tag message if TAG_ENB is set in the SCB control block. + * Use SCB_NONPACKET_TAG as the tag value. + */ +p_mesgout_tag: + test SCB_CONTROL,TAG_ENB jz p_mesgout_onebyte; + mov SCSIDAT, SINDEX; /* Send the identify message */ + call phase_lock; + cmp LASTPHASE, P_MESGOUT jne p_mesgout_done; + and SCSIDAT,TAG_ENB|SCB_TAG_TYPE,SCB_CONTROL; + call phase_lock; + cmp LASTPHASE, P_MESGOUT jne p_mesgout_done; + mov SCBPTR jmp p_mesgout_onebyte; +/* + * Interrupt the driver, and allow it to handle this message + * phase and any required retries. + */ +p_mesgout_from_host: + cmp SINDEX, HOST_MSG jne p_mesgout_onebyte; + jmp host_message_loop; + +p_mesgout_onebyte: + mvi CLRSINT1, CLRATNO; + mov SCSIDAT, SINDEX; + +/* + * If the next bus phase after ATN drops is message out, it means + * that the target is requesting that the last message(s) be resent. + */ + call phase_lock; + cmp LASTPHASE, P_MESGOUT je p_mesgout_retry; + +p_mesgout_done: + mvi CLRSINT1,CLRATNO; /* Be sure to turn ATNO off */ + mov LAST_MSG, MSG_OUT; + mvi MSG_OUT, MSG_NOOP; /* No message left */ + jmp ITloop; + +/* + * Message in phase. Bytes are read using Automatic PIO mode. + */ +p_mesgin: + /* read the 1st message byte */ + mvi ACCUM call inb_first; + + test A,MSG_IDENTIFYFLAG jnz mesgin_identify; + cmp A,MSG_DISCONNECT je mesgin_disconnect; + cmp A,MSG_SAVEDATAPOINTER je mesgin_sdptrs; + cmp ALLZEROS,A je mesgin_complete; + cmp A,MSG_RESTOREPOINTERS je mesgin_rdptrs; + cmp A,MSG_IGN_WIDE_RESIDUE je mesgin_ign_wide_residue; + cmp A,MSG_NOOP je mesgin_done; + +/* + * Pushed message loop to allow the kernel to + * run it's own message state engine. To avoid an + * extra nop instruction after signaling the kernel, + * we perform the phase_lock before checking to see + * if we should exit the loop and skip the phase_lock + * in the ITloop. Performing back to back phase_locks + * shouldn't hurt, but why do it twice... + */ +host_message_loop: + call phase_lock; /* Benign the first time through. */ + SET_SEQINTCODE(HOST_MSG_LOOP) + cmp RETURN_1, EXIT_MSG_LOOP je ITloop; + cmp RETURN_1, CONT_MSG_LOOP_WRITE jne . + 3; + mov SCSIDAT, RETURN_2; + jmp host_message_loop; + /* Must be CONT_MSG_LOOP_READ */ + mov NONE, SCSIDAT; /* ACK Byte */ + jmp host_message_loop; + +mesgin_ign_wide_residue: + mov SAVED_MODE, MODE_PTR; + SET_MODE(M_SCSI, M_SCSI) + shr NEGOADDR, 4, SAVED_SCSIID; + mov A, NEGCONOPTS; + RESTORE_MODE(SAVED_MODE) + test A, WIDEXFER jz mesgin_reject; + /* Pull the residue byte */ + mvi REG0 call inb_next; + cmp REG0, 0x01 jne mesgin_reject; + test SCB_RESIDUAL_SGPTR[0], SG_LIST_NULL jz . + 2; + test SCB_TASK_ATTRIBUTE, SCB_XFERLEN_ODD jnz mesgin_done; + SET_SEQINTCODE(IGN_WIDE_RES) + jmp mesgin_done; + +mesgin_proto_violation: + SET_SEQINTCODE(PROTO_VIOLATION) + jmp mesgin_done; +mesgin_reject: + mvi MSG_MESSAGE_REJECT call mk_mesg; +mesgin_done: + mov NONE,SCSIDAT; /*dummy read from latch to ACK*/ + jmp ITloop; + +#define INDEX_DISC_LIST(scsiid, lun) \ + and A, 0xC0, scsiid; \ + or SCBPTR, A, lun; \ + clr SCBPTR[1]; \ + and SINDEX, 0x30, scsiid; \ + shr SINDEX, 3; /* Multiply by 2 */ \ + add SINDEX, (SCB_DISCONNECTED_LISTS & 0xFF); \ + mvi SINDEX[1], ((SCB_DISCONNECTED_LISTS >> 8) & 0xFF) + +mesgin_identify: + /* + * Determine whether a target is using tagged or non-tagged + * transactions by first looking at the transaction stored in + * the per-device, disconnected array. If there is no untagged + * transaction for this target, this must be a tagged transaction. + */ + and SAVED_LUN, MSG_IDENTIFY_LUNMASK, A; + INDEX_DISC_LIST(SAVED_SCSIID, SAVED_LUN); + bmov DINDEX, SINDEX, 2; + bmov REG0, SINDIR, 2; + cmp REG0[1], SCB_LIST_NULL je snoop_tag; + /* Untagged. Clear the busy table entry and setup the SCB. */ + bmov DINDIR, ALLONES, 2; + bmov SCBPTR, REG0, 2; + jmp setup_SCB; + +/* + * Here we "snoop" the bus looking for a SIMPLE QUEUE TAG message. + * If we get one, we use the tag returned to find the proper + * SCB. After receiving the tag, look for the SCB at SCB locations tag and + * tag + 256. + */ +snoop_tag: + if ((ahd->flags & AHD_SEQUENCER_DEBUG) != 0) { + or SEQ_FLAGS, 0x80; + } + mov NONE, SCSIDAT; /* ACK Identify MSG */ + call phase_lock; + if ((ahd->flags & AHD_SEQUENCER_DEBUG) != 0) { + or SEQ_FLAGS, 0x1; + } + cmp LASTPHASE, P_MESGIN jne not_found_ITloop; + if ((ahd->flags & AHD_SEQUENCER_DEBUG) != 0) { + or SEQ_FLAGS, 0x2; + } + cmp SCSIBUS, MSG_SIMPLE_Q_TAG jne not_found; +get_tag: + clr SCBPTR[1]; + mvi SCBPTR call inb_next; /* tag value */ +verify_scb: + test SCB_CONTROL,DISCONNECTED jz verify_other_scb; + mov A, SAVED_SCSIID; + cmp SCB_SCSIID, A jne verify_other_scb; + mov A, SAVED_LUN; + cmp SCB_LUN, A je setup_SCB_disconnected; +verify_other_scb: + xor SCBPTR[1], 1; + test SCBPTR[1], 0xFF jnz verify_scb; + jmp not_found; + +/* + * Ensure that the SCB the tag points to is for + * an SCB transaction to the reconnecting target. + */ +setup_SCB: + if ((ahd->flags & AHD_SEQUENCER_DEBUG) != 0) { + or SEQ_FLAGS, 0x10; + } + test SCB_CONTROL,DISCONNECTED jz not_found; +setup_SCB_disconnected: + and SCB_CONTROL,~DISCONNECTED; + clr SEQ_FLAGS; /* make note of IDENTIFY */ + test SCB_SGPTR, SG_LIST_NULL jnz . + 3; + bmov ALLOCFIFO_SCBPTR, SCBPTR, 2; + call allocate_fifo; + /* See if the host wants to send a message upon reconnection */ + test SCB_CONTROL, MK_MESSAGE jz mesgin_done; + mvi HOST_MSG call mk_mesg; + jmp mesgin_done; + +not_found: + SET_SEQINTCODE(NO_MATCH) + jmp mesgin_done; + +not_found_ITloop: + SET_SEQINTCODE(NO_MATCH) + jmp ITloop; + +/* + * We received a "command complete" message. Put the SCB on the complete + * queue and trigger a completion interrupt via the idle loop. Before doing + * so, check to see if there + * is a residual or the status byte is something other than STATUS_GOOD (0). + * In either of these conditions, we upload the SCB back to the host so it can + * process this information. In the case of a non zero status byte, we + * additionally interrupt the kernel driver synchronously, allowing it to + * decide if sense should be retrieved. If the kernel driver wishes to request + * sense, it will fill the kernel SCB with a request sense command, requeue + * it to the QINFIFO and tell us not to post to the QOUTFIFO by setting + * RETURN_1 to SEND_SENSE. + */ +mesgin_complete: + + /* + * If ATN is raised, we still want to give the target a message. + * Perhaps there was a parity error on this last message byte. + * Either way, the target should take us to message out phase + * and then attempt to complete the command again. We should use a + * critical section here to guard against a timeout triggering + * for this command and setting ATN while we are still processing + * the completion. + test SCSISIGI, ATNI jnz mesgin_done; + */ + + /* + * If we are identified and have successfully sent the CDB, + * any status will do. Optimize this fast path. + */ + test SCB_CONTROL, STATUS_RCVD jz mesgin_proto_violation; + test SEQ_FLAGS, NOT_IDENTIFIED|NO_CDB_SENT jz complete_accepted; + + /* + * If the target never sent an identify message but instead went + * to mesgin to give an invalid message, let the host abort us. + */ + test SEQ_FLAGS, NOT_IDENTIFIED jnz mesgin_proto_violation; + + /* + * If we recevied good status but never successfully sent the + * cdb, abort the command. + */ + test SCB_SCSI_STATUS,0xff jnz complete_accepted; + test SEQ_FLAGS, NO_CDB_SENT jnz mesgin_proto_violation; +complete_accepted: + + /* + * See if we attempted to deliver a message but the target ingnored us. + */ + test SCB_CONTROL, MK_MESSAGE jz complete_nomsg; + SET_SEQINTCODE(MKMSG_FAILED) +complete_nomsg: + call queue_scb_completion; + jmp await_busfree; + +freeze_queue: + /* Cancel any pending select-out. */ + test SSTAT0, SELDO|SELINGO jnz . + 2; + and SCSISEQ0, ~ENSELO; + mov ACCUM_SAVE, A; + clr A; + add QFREEZE_COUNT, 1; + adc QFREEZE_COUNT[1], A; + or SEQ_FLAGS2, SELECTOUT_QFROZEN; + mov A, ACCUM_SAVE ret; + +/* + * Complete the current FIFO's SCB if data for this same + * SCB is not transferring in the other FIFO. + */ +SET_SRC_MODE M_DFF1; +SET_DST_MODE M_DFF1; +pkt_complete_scb_if_fifos_idle: + bmov ARG_1, SCBPTR, 2; + m |