| aic7xxx.seq (9954) | aic7xxx.seq (11829) |
|---|---|
| 1##+M######################################################################### 2# Adaptec 274x/284x/294x device driver for Linux and FreeBSD. 3# 4# Copyright (c) 1994 John Aycock 5# The University of Calgary Department of Computer Science. 6# All rights reserved. 7# 8# Modifications/enhancements: --- 27 unchanged lines hidden (view full) --- 36# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37# SUCH DAMAGE. 38# 39# FreeBSD, Twin, Wide, 2 command per target support, tagged queuing and other 40# optimizations provided by Justin T. Gibbs (gibbs@FreeBSD.org) 41# 42##-M######################################################################### 43 | 1##+M######################################################################### 2# Adaptec 274x/284x/294x device driver for Linux and FreeBSD. 3# 4# Copyright (c) 1994 John Aycock 5# The University of Calgary Department of Computer Science. 6# All rights reserved. 7# 8# Modifications/enhancements: --- 27 unchanged lines hidden (view full) --- 36# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37# SUCH DAMAGE. 38# 39# FreeBSD, Twin, Wide, 2 command per target support, tagged queuing and other 40# optimizations provided by Justin T. Gibbs (gibbs@FreeBSD.org) 41# 42##-M######################################################################### 43 |
| 44VERSION AIC7XXX_SEQ_VER "$Id: aic7xxx.seq,v 1.18 1995/07/31 08:21:59 gibbs Exp $" | 44VERSION AIC7XXX_SEQ_VER "$Id: aic7xxx.seq,v 1.21 1995/08/06 05:15:45 gibbs Exp $" |
| 45 46SCBMASK = 0xff 47 48SCSISEQ = 0x00 49ENRSELI = 0x10 50SXFRCTL0 = 0x01 | 45 46SCBMASK = 0xff 47 48SCSISEQ = 0x00 49ENRSELI = 0x10 50SXFRCTL0 = 0x01 |
| 51ULTRAEN = 0x20 |
|
| 51SXFRCTL1 = 0x02 52SCSISIGI = 0x03 53SCSISIGO = 0x03 54SCSIRATE = 0x04 55SCSIID = 0x05 56SCSIDATL = 0x06 57STCNT = 0x08 58STCNT+0 = 0x08 --- 395 unchanged lines hidden (view full) --- 454# yet. 455# 456ITloop: 457 test SSTAT1,0x8 jnz p_busfree # BUSFREE 458 test SSTAT1,0x1 jz ITloop # REQINIT 459 460 and A,0xe0,SCSISIGI # CDI|IOI|MSGI 461 | 52SXFRCTL1 = 0x02 53SCSISIGI = 0x03 54SCSISIGO = 0x03 55SCSIRATE = 0x04 56SCSIID = 0x05 57SCSIDATL = 0x06 58STCNT = 0x08 59STCNT+0 = 0x08 --- 395 unchanged lines hidden (view full) --- 455# yet. 456# 457ITloop: 458 test SSTAT1,0x8 jnz p_busfree # BUSFREE 459 test SSTAT1,0x1 jz ITloop # REQINIT 460 461 and A,0xe0,SCSISIGI # CDI|IOI|MSGI 462 |
| 463 mov A call scsisig |
|
| 462 cmp ALLZEROS,A je p_dataout 463 cmp A,0x40 je p_datain 464 cmp A,0x80 je p_command 465 cmp A,0xc0 je p_status 466 cmp A,0xa0 je p_mesgout 467 cmp A,0xe0 je p_mesgin 468 469 mvi INTSTAT,BAD_PHASE # unknown - signal driver 470 471p_dataout: | 464 cmp ALLZEROS,A je p_dataout 465 cmp A,0x40 je p_datain 466 cmp A,0x80 je p_command 467 cmp A,0xc0 je p_status 468 cmp A,0xa0 je p_mesgout 469 cmp A,0xe0 je p_mesgin 470 471 mvi INTSTAT,BAD_PHASE # unknown - signal driver 472 473p_dataout: |
| 472 mvi 0 call scsisig # !CDO|!IOO|!MSGO | |
| 473 mvi DMAPARAMS,0x7d # WIDEODD|SCSIEN|SDMAEN|HDMAEN| 474 # DIRECTION|FIFORESET 475 jmp data_phase_init 476 477# If we re-enter the data phase after going through another phase, the 478# STCNT may have been cleared, so restore it from the residual field. 479data_phase_reinit: 480 mvi DINDEX, STCNT 481 mvi SCBARRAY+15 call bcopy_3 482 jmp data_phase_loop 483 484# Reads should not use WIDEODD since it may make the last byte for a SG segment 485# go to the next segment. 486p_datain: | 474 mvi DMAPARAMS,0x7d # WIDEODD|SCSIEN|SDMAEN|HDMAEN| 475 # DIRECTION|FIFORESET 476 jmp data_phase_init 477 478# If we re-enter the data phase after going through another phase, the 479# STCNT may have been cleared, so restore it from the residual field. 480data_phase_reinit: 481 mvi DINDEX, STCNT 482 mvi SCBARRAY+15 call bcopy_3 483 jmp data_phase_loop 484 485# Reads should not use WIDEODD since it may make the last byte for a SG segment 486# go to the next segment. 487p_datain: |
| 487 mvi 0x40 call scsisig # !CDO|IOO|!MSGO | |
| 488 mvi DMAPARAMS,0x39 # SCSIEN|SDMAEN|HDMAEN| 489 # !DIRECTION|FIFORESET 490data_phase_init: 491 call assert 492 493 test FLAGS, DPHASE jnz data_phase_reinit 494 call sg_scb2ram 495 or FLAGS, DPHASE # We have seen a data phase --- 88 unchanged lines hidden (view full) --- 584 mov SCBARRAY+18, SG_COUNT 585 jmp ITloop 586 587# Command phase. Set up the DMA registers and let 'er rip - the 588# two bytes after the SCB SCSI_cmd_length are zeroed by the driver, 589# so we can copy those three bytes directly into HCNT. 590# 591p_command: | 488 mvi DMAPARAMS,0x39 # SCSIEN|SDMAEN|HDMAEN| 489 # !DIRECTION|FIFORESET 490data_phase_init: 491 call assert 492 493 test FLAGS, DPHASE jnz data_phase_reinit 494 call sg_scb2ram 495 or FLAGS, DPHASE # We have seen a data phase --- 88 unchanged lines hidden (view full) --- 584 mov SCBARRAY+18, SG_COUNT 585 jmp ITloop 586 587# Command phase. Set up the DMA registers and let 'er rip - the 588# two bytes after the SCB SCSI_cmd_length are zeroed by the driver, 589# so we can copy those three bytes directly into HCNT. 590# 591p_command: |
| 592 mvi 0x80 call scsisig # CDO|!IOO|!MSGO | |
| 593 call assert 594 595# Load HADDR and HCNT. We can do this in one bcopy since they are neighbors 596 mvi DINDEX,HADDR 597 mvi SCBARRAY+7 call bcopy_7 598 599 mvi DINDEX,STCNT 600 mvi SCBARRAY+11 call bcopy_3 601 602 mvi 0x3d call dma # SCSIEN|SDMAEN|HDMAEN| 603 # DIRECTION|FIFORESET 604 jmp ITloop 605 606# Status phase. Wait for the data byte to appear, then read it 607# and store it into the SCB. 608# 609p_status: | 592 call assert 593 594# Load HADDR and HCNT. We can do this in one bcopy since they are neighbors 595 mvi DINDEX,HADDR 596 mvi SCBARRAY+7 call bcopy_7 597 598 mvi DINDEX,STCNT 599 mvi SCBARRAY+11 call bcopy_3 600 601 mvi 0x3d call dma # SCSIEN|SDMAEN|HDMAEN| 602 # DIRECTION|FIFORESET 603 jmp ITloop 604 605# Status phase. Wait for the data byte to appear, then read it 606# and store it into the SCB. 607# 608p_status: |
| 610 mvi 0xc0 call scsisig # CDO|IOO|!MSGO | |
| 611 612 mvi SCBARRAY+14 call inb_first 613 jmp mesgin_done 614 615# Message out phase. If there is no active message, but the target 616# took us into this phase anyway, build a no-op message and send it. 617# 618p_mesgout: | 609 610 mvi SCBARRAY+14 call inb_first 611 jmp mesgin_done 612 613# Message out phase. If there is no active message, but the target 614# took us into this phase anyway, build a no-op message and send it. 615# 616p_mesgout: |
| 619 mvi 0xa0 call scsisig # CDO|!IOO|MSGO | |
| 620 mvi 0x8 call mk_mesg # build NOP message 621 622 clr STCNT+2 623 clr STCNT+1 624 625# Set up automatic PIO transfer from MSG_START. Bit 3 in 626# SXFRCTL0 (SPIOEN) is already on. 627# --- 43 unchanged lines hidden (view full) --- 671# that the target is requesting that the last message(s) be resent. 672# 673p_mesgout5: 674 test SSTAT1,0x8 jnz p_mesgout6 # BUSFREE 675 test SSTAT1,0x1 jz p_mesgout5 # REQINIT 676 677 and A,0xe0,SCSISIGI # CDI|IOI|MSGI 678 cmp A,0xa0 jne p_mesgout6 | 617 mvi 0x8 call mk_mesg # build NOP message 618 619 clr STCNT+2 620 clr STCNT+1 621 622# Set up automatic PIO transfer from MSG_START. Bit 3 in 623# SXFRCTL0 (SPIOEN) is already on. 624# --- 43 unchanged lines hidden (view full) --- 668# that the target is requesting that the last message(s) be resent. 669# 670p_mesgout5: 671 test SSTAT1,0x8 jnz p_mesgout6 # BUSFREE 672 test SSTAT1,0x1 jz p_mesgout5 # REQINIT 673 674 and A,0xe0,SCSISIGI # CDI|IOI|MSGI 675 cmp A,0xa0 jne p_mesgout6 |
| 679 mvi 0x10 call scsisig # ATNO - re-assert ATN | 676 or SINDEX,0x10,SIGSTATE # turn on ATNO 677 call scsisig # ATNO - re-assert ATN |
| 680 681 jmp ITloop 682 683p_mesgout6: 684 mvi CLRSINT1,0x40 # CLRATNO - in case of PHASEMIS 685 and FLAGS,0xdf # no active msg 686 jmp ITloop 687 688# Message in phase. Bytes are read using Automatic PIO mode, but not 689# using inb. This alleviates a race condition, namely that if ATN had 690# to be asserted under Automatic PIO mode, it had to beat the SCSI 691# circuitry sending an ACK to the target. This showed up under heavy 692# loads and really confused things, since ABORT commands wouldn't be 693# seen by the drive after an IDENTIFY message in until it had changed 694# to a data I/O phase. 695# 696p_mesgin: | 678 679 jmp ITloop 680 681p_mesgout6: 682 mvi CLRSINT1,0x40 # CLRATNO - in case of PHASEMIS 683 and FLAGS,0xdf # no active msg 684 jmp ITloop 685 686# Message in phase. Bytes are read using Automatic PIO mode, but not 687# using inb. This alleviates a race condition, namely that if ATN had 688# to be asserted under Automatic PIO mode, it had to beat the SCSI 689# circuitry sending an ACK to the target. This showed up under heavy 690# loads and really confused things, since ABORT commands wouldn't be 691# seen by the drive after an IDENTIFY message in until it had changed 692# to a data I/O phase. 693# 694p_mesgin: |
| 697 mvi 0xe0 call scsisig # CDO|IOO|MSGO | |
| 698 mvi A call inb_first # read the 1st message byte 699 mvi REJBYTE,A # save it for the driver 700 701 test A,0x80 jnz mesgin_identify # identify message? 702 cmp A,4 je mesgin_disconnect # disconnect? 703 cmp A,2 je mesgin_sdptrs # save data pointers? 704 cmp ALLZEROS,A je mesgin_complete # command complete? 705 cmp A,3 je mesgin_rdptrs # restore pointers code? --- 46 unchanged lines hidden (view full) --- 752 753status_ok: 754# First, mark this target as free. 755 test SCBARRAY+0,TAG_ENB jnz complete # Tagged command 756 and FUNCTION1,0x70,SCBARRAY+1 757 mov A,FUNCTION1 758 test SCBARRAY+1,0x88 jz clear_a 759 xor ACTIVE_B,A | 695 mvi A call inb_first # read the 1st message byte 696 mvi REJBYTE,A # save it for the driver 697 698 test A,0x80 jnz mesgin_identify # identify message? 699 cmp A,4 je mesgin_disconnect # disconnect? 700 cmp A,2 je mesgin_sdptrs # save data pointers? 701 cmp ALLZEROS,A je mesgin_complete # command complete? 702 cmp A,3 je mesgin_rdptrs # restore pointers code? --- 46 unchanged lines hidden (view full) --- 749 750status_ok: 751# First, mark this target as free. 752 test SCBARRAY+0,TAG_ENB jnz complete # Tagged command 753 and FUNCTION1,0x70,SCBARRAY+1 754 mov A,FUNCTION1 755 test SCBARRAY+1,0x88 jz clear_a 756 xor ACTIVE_B,A |
| 760 jmp complete | 757 jmp immediate |
| 761 762clear_a: 763 xor ACTIVE_A,A 764 | 758 759clear_a: 760 xor ACTIVE_A,A 761 |
| 762immediate: |
|
| 765 test SCBARRAY+11,0xff jnz complete # Immediate message complete 766# Pause the sequencer until the driver gets around to handling the command 767# complete. This is so that any action that might require carefull timing 768# with the completion of this command can occur. 769 mvi INTSTAT,IMMEDDONE 770 jmp poll_for_work 771complete: 772 mov QOUTFIFO,SCBPTR --- 281 unchanged lines hidden (view full) --- 1054# Turn on Automatic PIO mode now, before we expect to see a REQ 1055# from the target. It shouldn't hurt anything to leave it on. Set 1056# CLRCHN here before the target has entered a data transfer mode - 1057# with synchronous SCSI, if you do it later, you blow away some 1058# data in the SCSI FIFO that the target has already sent to you. 1059# 1060 clr SIGSTATE 1061 | 763 test SCBARRAY+11,0xff jnz complete # Immediate message complete 764# Pause the sequencer until the driver gets around to handling the command 765# complete. This is so that any action that might require carefull timing 766# with the completion of this command can occur. 767 mvi INTSTAT,IMMEDDONE 768 jmp poll_for_work 769complete: 770 mov QOUTFIFO,SCBPTR --- 281 unchanged lines hidden (view full) --- 1052# Turn on Automatic PIO mode now, before we expect to see a REQ 1053# from the target. It shouldn't hurt anything to leave it on. Set 1054# CLRCHN here before the target has entered a data transfer mode - 1055# with synchronous SCSI, if you do it later, you blow away some 1056# data in the SCSI FIFO that the target has already sent to you. 1057# 1058 clr SIGSTATE 1059 |
| 1062 mvi SXFRCTL0,0x8a # DFON|SPIOEN|CLRCHN | 1060 or SXFRCTL0,0x8a # DFON|SPIOEN|CLRCHN |
| 1063 1064# Make sure that the system knows we have not been through a DATA 1065# phase. 1066 and FLAGS, 0xfb # !DPHASE 1067 1068# Initialize SCSIRATE with the appropriate value for this target. 1069# 1070 call ndx_dtr --- 144 unchanged lines hidden (view full) --- 1215 clr RETURN_1 1216sdtr_to_rate_loop: 1217 test A,0x0f jz sdtr_to_rate_done 1218 add RETURN_1,0x18 1219 dec A 1220 jmp sdtr_to_rate_loop 1221sdtr_to_rate_done: 1222 shr RETURN_1,0x2 | 1061 1062# Make sure that the system knows we have not been through a DATA 1063# phase. 1064 and FLAGS, 0xfb # !DPHASE 1065 1066# Initialize SCSIRATE with the appropriate value for this target. 1067# 1068 call ndx_dtr --- 144 unchanged lines hidden (view full) --- 1213 clr RETURN_1 1214sdtr_to_rate_loop: 1215 test A,0x0f jz sdtr_to_rate_done 1216 add RETURN_1,0x18 1217 dec A 1218 jmp sdtr_to_rate_loop 1219sdtr_to_rate_done: 1220 shr RETURN_1,0x2 |
| 1223 add RETURN_1,0x18 ret 1224 | 1221 add RETURN_1,0x18 1222 test SXFRCTL0,ULTRAEN jz return 1223 shr RETURN_1,0x1 |
| 1225return: 1226 ret | 1224return: 1225 ret |