diff options
Diffstat (limited to 'sys/dev/aic7xxx/aic7xxx.seq')
| -rw-r--r-- | sys/dev/aic7xxx/aic7xxx.seq | 52 |
1 files changed, 41 insertions, 11 deletions
diff --git a/sys/dev/aic7xxx/aic7xxx.seq b/sys/dev/aic7xxx/aic7xxx.seq index c5a1e9b..e8cc5bb 100644 --- a/sys/dev/aic7xxx/aic7xxx.seq +++ b/sys/dev/aic7xxx/aic7xxx.seq @@ -41,7 +41,7 @@ # ##-M######################################################################### -VERSION AIC7XXX_SEQ_VER "$Id: aic7xxx.seq,v 1.14 1995/04/15 21:45:56 gibbs Exp $" +VERSION AIC7XXX_SEQ_VER "$Id: aic7xxx.seq,v 1.15 1995/04/27 17:44:27 gibbs Exp $" SCBMASK = 0x1f @@ -155,6 +155,12 @@ MSG_REJECT = 0x61 # Reject message recieved BAD_STATUS = 0x71 # Bad status from target RESIDUAL = 0x81 # Residual byte count != 0 ABORT_TAG = 0x91 # Sent an ABORT_TAG message +AWAITING_MSG = 0xa1 # Kernel requested to specify + # a message to this target + # (command was null), so tell + # it that it can fill the + # message buffer. + # The host adapter card (at least the BIOS) uses 20-2f for SCSI # device information, 32-33 and 5a-5f as well. As it turns out, the @@ -179,8 +185,8 @@ ABORT_TAG = 0x91 # Sent an ABORT_TAG message # bank, so force a kernel panic if the target attempts a data in/out or # command phase instead of corrupting something. FLAGS also contains # configuration bits so that we can optimize for TWIN and WIDE controllers -# as well as the MAX_SYNC bit which we set when we want to negotiate for -# 10MHz irregardless of what the per target scratch space says. +# as well as the MAX_OFFSET bit which we set when we want to negotiate for +# maximum sync offset irregardless of what the per target scratch space says. # # Note that SG_NEXT occupies four bytes. # @@ -222,11 +228,14 @@ SCBCOUNT = 0x52 # the actual number of SCBs FLAGS = 0x53 # Device configuration flags TWIN_BUS = 0x01 WIDE_BUS = 0x02 -MAX_SYNC = 0x08 +MAX_OFFSET = 0x08 ACTIVE_MSG = 0x20 IDENTIFY_SEEN = 0x40 RESELECTED = 0x80 +MAX_OFFSET_8BIT = 0x0f +MAX_OFFSET_WIDE = 0x08 + ACTIVE_A = 0x54 ACTIVE_B = 0x55 SAVED_TCL = 0x56 # Temporary storage for the @@ -369,6 +378,17 @@ start_selection: # Messages are stored in scratch RAM starting with a flag byte (high bit # set means active message), one length byte, and then the message itself. # + + test SCBARRAY+11,0xff jnz identify # 0 Length Command? + +# The kernel has sent us an SCB with no command attached. This implies +# that the kernel wants to send a message of some sort to this target, +# so we interrupt the driver, allow it to fill the message buffer, and +# then go back into the arbitration loop + mvi INTSTAT,AWAITING_MSG + jmp poll_for_work + +identify: mov SCBARRAY+1 call disconnect # disconnect ok? and SINDEX,0x7,SCBARRAY+1 # lun @@ -682,6 +702,7 @@ clear_a: complete: mov QOUTFIFO,SCBPTR mvi INTSTAT,CMDCMPLT + test SCBARRAY+11,0xff jz start # Immediate message complete jmp p_mesgin_done # If we have a residual count, interrupt and tell the host. Other @@ -851,6 +872,10 @@ p_mesgin_done: p_busfree: mvi CLRSINT1,0x40 # CLRATNO clr SIGSTATE + +# if this is an immediate command, perform a psuedo command complete to +# notify the driver. + test SCBARRAY+11,0xff jz status_ok jmp start # Instead of a generic bcopy routine that requires an argument, we unroll @@ -1202,7 +1227,7 @@ ndx_dtr_2: mk_dtr: test SCBARRAY+0,0xc0 jz return # NEEDWDTR|NEEDSDTR test SCBARRAY+0,NEEDWDTR jnz mk_wdtr_16bit - or FLAGS, MAX_SYNC # Force an offset of 15 + or FLAGS, MAX_OFFSET # Force an offset of 15 or 8 if WIDE mk_sdtr: mvi DINDIR,1 # extended message @@ -1210,16 +1235,21 @@ mk_sdtr: mvi DINDIR,1 # SDTR code call sdtr_to_rate mov DINDIR,RETURN_1 # REQ/ACK transfer period - test FLAGS, MAX_SYNC jnz mk_sdtr_max_sync - and DINDIR,0xf,SINDIR # Sync Offset + test FLAGS, MAX_OFFSET jnz mk_sdtr_max_offset + and DINDIR,0x0f,SINDIR # Sync Offset mk_sdtr_done: add MSG_LEN,-MSG_START+0,DINDEX ret # update message length -mk_sdtr_max_sync: -# We're initiating sync negotiation, so request the max offset we can (15) - mvi DINDIR, 0x0f - xor FLAGS, MAX_SYNC +mk_sdtr_max_offset: +# We're initiating sync negotiation, so request the max offset we can (15 or 8) + xor FLAGS, MAX_OFFSET + test SCSIRATE, 0x80 jnz wmax_offset # Talking to a WIDE device? + mvi DINDIR, MAX_OFFSET_8BIT + jmp mk_sdtr_done + +wmax_offset: + mvi DINDIR, MAX_OFFSET_WIDE jmp mk_sdtr_done mk_wdtr_16bit: |
