| aic7xxx.seq (9810) | aic7xxx.seq (9917) |
|---|---|
| 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 1.17 1995/07/04 20:58:57 gibbs Exp $" | 44VERSION AIC7XXX_SEQ_VER "$Id: aic7xxx.seq,v 1.18 1995/07/31 08:21:59 gibbs Exp $" |
| 45 46SCBMASK = 0x1f 47 48SCSISEQ = 0x00 49ENRSELI = 0x10 50SXFRCTL0 = 0x01 51SXFRCTL1 = 0x02 52SCSISIGI = 0x03 --- 210 unchanged lines hidden (view full) --- 263WAITING_SCBT = 0x58 # tail of list of SCBs awaiting 264 # selection 265SCB_LIST_NULL = 0xff 266 267 268# Poll QINCNT for work - the lower bits contain 269# the number of entries in the Queue In FIFO. 270# | 45 46SCBMASK = 0x1f 47 48SCSISEQ = 0x00 49ENRSELI = 0x10 50SXFRCTL0 = 0x01 51SXFRCTL1 = 0x02 52SCSISIGI = 0x03 --- 210 unchanged lines hidden (view full) --- 263WAITING_SCBT = 0x58 # tail of list of SCBs awaiting 264 # selection 265SCB_LIST_NULL = 0xff 266 267 268# Poll QINCNT for work - the lower bits contain 269# the number of entries in the Queue In FIFO. 270# |
| 271start: 272 cmp WAITING_SCBH,SCB_LIST_NULL jne start_waiting | |
| 273poll_for_work: 274 test FLAGS,TWIN_BUS jz start2 # Are we a twin channel device? 275# For fairness, we check the other bus first, since we just finished a 276# transaction on the current channel. 277 xor SBLKCTL,0x08 # Toggle to the other bus 278 test SSTAT0,SELDI jnz reselect | 271poll_for_work: 272 test FLAGS,TWIN_BUS jz start2 # Are we a twin channel device? 273# For fairness, we check the other bus first, since we just finished a 274# transaction on the current channel. 275 xor SBLKCTL,0x08 # Toggle to the other bus 276 test SSTAT0,SELDI jnz reselect |
| 279 test SSTAT0,SELDO jnz select | |
| 280 xor SBLKCTL,0x08 # Toggle to the original bus 281start2: 282 test SSTAT0,SELDI jnz reselect | 277 xor SBLKCTL,0x08 # Toggle to the original bus 278start2: 279 test SSTAT0,SELDI jnz reselect |
| 283 test SSTAT0,SELDO jnz select | |
| 284 cmp WAITING_SCBH,SCB_LIST_NULL jne start_waiting 285 test QINCNT,SCBMASK jz poll_for_work 286 287# We have at least one queued SCB now and we don't have any 288# SCBs in the list of SCBs awaiting selection. Set the SCB 289# pointer from the FIFO so we see the right bank of SCB 290# registers, then set SCSI options and set the initiator and 291# target SCSI IDs. --- 91 unchanged lines hidden (view full) --- 383 384 test SCBARRAY+11,0xff jnz identify # 0 Length Command? 385 386# The kernel has sent us an SCB with no command attached. This implies 387# that the kernel wants to send a message of some sort to this target, 388# so we interrupt the driver, allow it to fill the message buffer, and 389# then go back into the arbitration loop 390 mvi INTSTAT,AWAITING_MSG | 280 cmp WAITING_SCBH,SCB_LIST_NULL jne start_waiting 281 test QINCNT,SCBMASK jz poll_for_work 282 283# We have at least one queued SCB now and we don't have any 284# SCBs in the list of SCBs awaiting selection. Set the SCB 285# pointer from the FIFO so we see the right bank of SCB 286# registers, then set SCSI options and set the initiator and 287# target SCSI IDs. --- 91 unchanged lines hidden (view full) --- 379 380 test SCBARRAY+11,0xff jnz identify # 0 Length Command? 381 382# The kernel has sent us an SCB with no command attached. This implies 383# that the kernel wants to send a message of some sort to this target, 384# so we interrupt the driver, allow it to fill the message buffer, and 385# then go back into the arbitration loop 386 mvi INTSTAT,AWAITING_MSG |
| 391 jmp poll_for_work | 387 jmp wait_for_selection |
| 392 393identify: 394 mov SCBARRAY+1 call disconnect # disconnect ok? 395 396 and SINDEX,0x7,SCBARRAY+1 # lun 397 or SINDEX,A # return value from disconnect 398 or SINDEX,0x80 call mk_mesg # IDENTIFY message 399 --- 13 unchanged lines hidden (view full) --- 413 414 add MSG_LEN,-MSG_START+0,DINDEX # update message length 415 416mk_tag_done: 417 418 mov DINDEX call mk_dtr # build DTR message if needed 419 420!message: | 388 389identify: 390 mov SCBARRAY+1 call disconnect # disconnect ok? 391 392 and SINDEX,0x7,SCBARRAY+1 # lun 393 or SINDEX,A # return value from disconnect 394 or SINDEX,0x80 call mk_mesg # IDENTIFY message 395 --- 13 unchanged lines hidden (view full) --- 409 410 add MSG_LEN,-MSG_START+0,DINDEX # update message length 411 412mk_tag_done: 413 414 mov DINDEX call mk_dtr # build DTR message if needed 415 416!message: |
| 421 jmp poll_for_work | 417wait_for_selection: 418 test SSTAT0,SELDI jnz reselect 419 test SSTAT0,SELDO jnz select 420 jmp wait_for_selection |
| 422 423# Reselection has been initiated by a target. Make a note that we've been 424# reselected, but haven't seen an IDENTIFY message from the target 425# yet. 426# 427reselect: 428 mov SELID call initialize_scsiid 429 and FLAGS,0x3f # reselected, no IDENTIFY --- 271 unchanged lines hidden (view full) --- 701clear_a: 702 xor ACTIVE_A,A 703 704 test SCBARRAY+11,0xff jnz complete # Immediate message complete 705# Pause the sequencer until the driver gets around to handling the command 706# complete. This is so that any action that might require carefull timing 707# with the completion of this command can occur. 708 mvi INTSTAT,IMMEDDONE | 421 422# Reselection has been initiated by a target. Make a note that we've been 423# reselected, but haven't seen an IDENTIFY message from the target 424# yet. 425# 426reselect: 427 mov SELID call initialize_scsiid 428 and FLAGS,0x3f # reselected, no IDENTIFY --- 271 unchanged lines hidden (view full) --- 700clear_a: 701 xor ACTIVE_A,A 702 703 test SCBARRAY+11,0xff jnz complete # Immediate message complete 704# Pause the sequencer until the driver gets around to handling the command 705# complete. This is so that any action that might require carefull timing 706# with the completion of this command can occur. 707 mvi INTSTAT,IMMEDDONE |
| 709 jmp start | 708 jmp poll_for_work |
| 710complete: 711 mov QOUTFIFO,SCBPTR 712 mvi INTSTAT,CMDCMPLT 713 jmp p_mesgin_done 714 715# If we have a residual count, interrupt and tell the host. Other 716# alternatives are to pause the sequencer on all command completes (yuck), 717# dma the resid directly to the host (slick, but a ton of instructions), or --- 160 unchanged lines hidden (view full) --- 878# 879p_busfree: 880 mvi CLRSINT1,0x40 # CLRATNO 881 clr SIGSTATE 882 883# if this is an immediate command, perform a psuedo command complete to 884# notify the driver. 885 test SCBARRAY+11,0xff jz status_ok | 709complete: 710 mov QOUTFIFO,SCBPTR 711 mvi INTSTAT,CMDCMPLT 712 jmp p_mesgin_done 713 714# If we have a residual count, interrupt and tell the host. Other 715# alternatives are to pause the sequencer on all command completes (yuck), 716# dma the resid directly to the host (slick, but a ton of instructions), or --- 160 unchanged lines hidden (view full) --- 877# 878p_busfree: 879 mvi CLRSINT1,0x40 # CLRATNO 880 clr SIGSTATE 881 882# if this is an immediate command, perform a psuedo command complete to 883# notify the driver. 884 test SCBARRAY+11,0xff jz status_ok |
| 886 jmp start | 885 jmp poll_for_work |
| 887 888# Instead of a generic bcopy routine that requires an argument, we unroll 889# the two cases that are actually used, and call them explicitly. This 890# not only reduces the overhead of doing a bcopy by 2/3rds, but ends up 891# saving space in the program since you don't have to put the argument 892# into the accumulator before the call. Both functions expect DINDEX to 893# contain the destination address and SINDEX to contain the source 894# address. --- 405 unchanged lines hidden --- | 886 887# Instead of a generic bcopy routine that requires an argument, we unroll 888# the two cases that are actually used, and call them explicitly. This 889# not only reduces the overhead of doing a bcopy by 2/3rds, but ends up 890# saving space in the program since you don't have to put the argument 891# into the accumulator before the call. Both functions expect DINDEX to 892# contain the destination address and SINDEX to contain the source 893# address. --- 405 unchanged lines hidden --- |