aic7xxx.seq (23168) | aic7xxx.seq (23925) |
---|---|
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 *FreeBSD, Twin, Wide, 2 command per target support, tagged queuing, 9 *SCB paging and other optimizations: | 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 *FreeBSD, Twin, Wide, 2 command per target support, tagged queuing, 9 *SCB paging and other optimizations: |
10 *Copyright (c) 1994, 1995, 1996 Justin Gibbs. All rights reserved. | 10 *Copyright (c) 1994, 1995, 1996, 1997 Justin Gibbs. All rights reserved. |
11 * 12 *Redistribution and use in source and binary forms, with or without 13 *modification, are permitted provided that the following conditions 14 *are met: 15 *1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions, and the following disclaimer. 17 *2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the --- 15 unchanged lines hidden (view full) --- 34 *OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 *HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 *LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 *OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 *SUCH DAMAGE. 39 * 40 *-M************************************************************************/ 41 | 11 * 12 *Redistribution and use in source and binary forms, with or without 13 *modification, are permitted provided that the following conditions 14 *are met: 15 *1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions, and the following disclaimer. 17 *2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the --- 15 unchanged lines hidden (view full) --- 34 *OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 *HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 *LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 *OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 *SUCH DAMAGE. 39 * 40 *-M************************************************************************/ 41 |
42VERSION AIC7XXX_SEQ_VER "$Id: aic7xxx.seq,v 1.62 1997/02/25 03:02:56 gibbs Exp$" | 42#include <dev/aic7xxx/aic7xxx.reg> 43#include <scsi/scsi_message.h> |
43 | 44 |
44#if defined(__NetBSD__) 45#include "../../../../dev/ic/aic7xxxreg.h" 46#include "../../../../scsi/scsi_message.h" 47#elif defined(__FreeBSD__) 48#include "../../dev/aic7xxx/aic7xxx_reg.h" 49#include "../../scsi/scsi_message.h" 50#endif 51 | |
52/* | 45/* |
53 * We can't just use ACCUM in the sequencer code because it 54 * must be treated specially by the assembler, and it currently 55 * looks for the symbol 'A'. This is the only register defined in 56 * the assembler's symbol space. 57 */ 58A = ACCUM 59 60/* | |
61 * A few words on the waiting SCB list: 62 * After starting the selection hardware, we check for reconnecting targets 63 * as well as for our selection to complete just in case the reselection wins 64 * bus arbitration. The problem with this is that we must keep track of the 65 * SCB that we've already pulled from the QINFIFO and started the selection 66 * on just in case the reselection wins so that we can retry the selection at 67 * a later time. This problem cannot be resolved by holding a single entry 68 * in scratch ram since a reconnecting target can request sense and this will --- 6 unchanged lines hidden (view full) --- 75 * automatically consume the entries. 76 */ 77 78/* 79 * We assume that the kernel driver may reset us at any time, even in the 80 * middle of a DMA, so clear DFCNTRL too. 81 */ 82reset: | 46 * A few words on the waiting SCB list: 47 * After starting the selection hardware, we check for reconnecting targets 48 * as well as for our selection to complete just in case the reselection wins 49 * bus arbitration. The problem with this is that we must keep track of the 50 * SCB that we've already pulled from the QINFIFO and started the selection 51 * on just in case the reselection wins so that we can retry the selection at 52 * a later time. This problem cannot be resolved by holding a single entry 53 * in scratch ram since a reconnecting target can request sense and this will --- 6 unchanged lines hidden (view full) --- 60 * automatically consume the entries. 61 */ 62 63/* 64 * We assume that the kernel driver may reset us at any time, even in the 65 * middle of a DMA, so clear DFCNTRL too. 66 */ 67reset: |
83 clr SCSISIGO /* De-assert BSY */ 84 mvi SCSISEQ,0x12 /* Always allow reselection 85 * ENRSELI|ENAUTOATNP 86 */ 87p_busfree: 88 clr DFCNTRL 89 clr SCSIRATE /* 90 * We don't know the target we will 91 * connect to, so default to narrow 92 * transfers to avoid parity problems. 93 */ 94 and SXFRCTL0, 0xdf /* ~FAST20*/ 95 mvi LASTPHASE, P_BUSFREE 96 and FLAGS,0x07 /* clear target specific flags */ | 68 clr SCSISIGO; /* De-assert BSY */ 69 /* Always allow reselection */ 70 mvi SCSISEQ, ENRSELI|ENAUTOATNP; 71 call clear_target_state; |
97poll_for_work: | 72poll_for_work: |
73 test SSTAT0,SELDI|SELDO jnz selection; 74 test SCSISEQ, ENSELO jnz poll_for_work; 75.if ( TWIN_CHANNEL ) |
|
98 /* | 76 /* |
99 * Are we a twin channel device? 100 * For fairness, we check the other bus first, 101 * since we just finished a transaction on the 102 * current channel. | 77 * Twin channel devices cannot handle things like SELTO 78 * interrupts on the "background" channel. So, if we 79 * are selecting, keep polling the current channel util 80 * either a selection or reselection occurs. |
103 */ | 81 */ |
104 test FLAGS,TWIN_BUS jz start2 105 xor SBLKCTL,SELBUSB /* Toggle to the other bus */ 106 test SSTAT0,SELDI jnz reselect 107 xor SBLKCTL,SELBUSB /* Toggle to the original bus */ 108start2: 109 test SSTAT0,SELDI jnz reselect 110 cmp WAITING_SCBH,SCB_LIST_NULL je test_queue 111start_waiting: 112 /* 113 * Pull the first entry off of the waiting SCB list 114 * We don't have to "test_busy" because only transactions that 115 * have passed that test can be in the WAITING_SCB list. 116 */ 117 mov SCBPTR,WAITING_SCBH 118 jmp start_scb2 | 82 xor SBLKCTL,SELBUSB; /* Toggle to the other bus */ 83 test SSTAT0,SELDI|SELDO jnz selection; 84 test SCSISEQ, ENSELO jnz poll_for_work; 85 xor SBLKCTL,SELBUSB; /* Toggle back */ 86.endif 87 cmp WAITING_SCBH,SCB_LIST_NULL jne start_waiting; |
119test_queue: 120 /* Has the driver posted any work for us? */ | 88test_queue: 89 /* Has the driver posted any work for us? */ |
121 mov A, QCNTMASK 122 test QINCNT,A jz poll_for_work | 90 mov A, QCNTMASK; 91 test QINCNT,A jz poll_for_work; |
123 124/* 125 * We have at least one queued SCB now and we don't have any 126 * SCBs in the list of SCBs awaiting selection. If we have | 92 93/* 94 * We have at least one queued SCB now and we don't have any 95 * SCBs in the list of SCBs awaiting selection. If we have |
127 * any SCBs availible for use, pull the tag from the QINFIFO | 96 * any SCBs available for use, pull the tag from the QINFIFO |
128 * and get to work on it. 129 */ | 97 * and get to work on it. 98 */ |
130 test FLAGS, PAGESCBS jz dequeue_scb 131 mov ALLZEROS call get_free_or_disc_scb 132 cmp SINDEX, SCB_LIST_NULL je poll_for_work | 99.if ( SCB_PAGING ) 100 mov ALLZEROS call get_free_or_disc_scb; 101 cmp SINDEX, SCB_LIST_NULL je poll_for_work; 102.endif |
133dequeue_scb: | 103dequeue_scb: |
134 mov CUR_SCBID,QINFIFO 135 test FLAGS, PAGESCBS jnz dma_queued_scb | 104 mov CUR_SCBID,QINFIFO; 105.if !( SCB_PAGING ) |
136 /* In the non-paging case, the SCBID == hardware SCB index */ | 106 /* In the non-paging case, the SCBID == hardware SCB index */ |
137 mov SCBPTR, CUR_SCBID | 107 mov SCBPTR, CUR_SCBID; 108.endif |
138dma_queued_scb: 139/* 140 * DMA the SCB from host ram into the current SCB location. 141 */ | 109dma_queued_scb: 110/* 111 * DMA the SCB from host ram into the current SCB location. 112 */ |
142 mvi DMAPARAMS, 0xd /* HDMAEN|DIRECTION|FIFORESET */ 143 mov CUR_SCBID call dma_scb | 113 mvi DMAPARAMS, HDMAEN|DIRECTION|FIFORESET; 114 mov CUR_SCBID call dma_scb; |
144 145/* 146 * See if there is not already an active SCB for this target. This code 147 * locks out on a per target basis instead of target/lun. Although this 148 * is not ideal for devices that have multiple luns active at the same 149 * time, it is faster than looping through all SCB's looking for active 150 * commands. We also don't have enough spare SCB space for us to store the 151 * SCBID of the currently busy transaction for each target/lun making it 152 * impossible to link up the SCBs. 153 */ 154test_busy: | 115 116/* 117 * See if there is not already an active SCB for this target. This code 118 * locks out on a per target basis instead of target/lun. Although this 119 * is not ideal for devices that have multiple luns active at the same 120 * time, it is faster than looping through all SCB's looking for active 121 * commands. We also don't have enough spare SCB space for us to store the 122 * SCBID of the currently busy transaction for each target/lun making it 123 * impossible to link up the SCBs. 124 */ 125test_busy: |
155 test SCB_CONTROL, TAG_ENB jnz start_scb 156 mvi SEQCTL,0x50 /* PAUSEDIS|FASTMODE */ 157 mov SAVED_SCBPTR, SCBPTR 158 mov SCB_TCL call index_untagged_scb 159 mov ARG_1, SINDIR /* | 126 test SCB_CONTROL, TAG_ENB|ABORT_SCB jnz start_scb; 127 mvi SEQCTL, PAUSEDIS|FASTMODE; 128 mov SAVED_SCBPTR, SCBPTR; 129 mov SCB_TCL call index_untagged_scb; 130 mov ARG_1, SINDIR; /* |
160 * ARG_1 should 161 * now have the SCB ID of 162 * any active, non-tagged, 163 * command for this target. 164 */ | 131 * ARG_1 should 132 * now have the SCB ID of 133 * any active, non-tagged, 134 * command for this target. 135 */ |
165 cmp ARG_1, SCB_LIST_NULL je make_busy 166 test FLAGS, PAGESCBS jz simple_busy_link | 136 cmp ARG_1, SCB_LIST_NULL je make_busy; 137.if ( SCB_PAGING ) |
167 /* 168 * Put this SCB back onto the free list. It 169 * may be necessary to satisfy the search for 170 * the active SCB. 171 */ | 138 /* 139 * Put this SCB back onto the free list. It 140 * may be necessary to satisfy the search for 141 * the active SCB. 142 */ |
172 mov SCBPTR, SAVED_SCBPTR 173 call add_scb_to_free_list | 143 mov SCBPTR, SAVED_SCBPTR; 144 call add_scb_to_free_list; |
174 /* Find the active SCB */ | 145 /* Find the active SCB */ |
175 mov ALLZEROS call findSCB | 146 mov ALLZEROS call findSCB; |
176 /* 177 * If we couldn't find it, tell the kernel. This should 178 * never happen. 179 */ | 147 /* 148 * If we couldn't find it, tell the kernel. This should 149 * never happen. 150 */ |
180 cmp SINDEX, SCB_LIST_NULL jne paged_busy_link 181 mvi INTSTAT, NO_MATCH_BUSY | 151 cmp SINDEX, SCB_LIST_NULL jne paged_busy_link; 152 mvi INTSTAT, NO_MATCH_BUSY; |
182paged_busy_link: 183 /* Link us in */ | 153paged_busy_link: 154 /* Link us in */ |
184 mov SCB_LINKED_NEXT, CUR_SCBID | 155 mov SCB_LINKED_NEXT, CUR_SCBID; |
185 /* Put it back on the disconnected list */ | 156 /* Put it back on the disconnected list */ |
186 call add_scb_to_disc_list 187 mvi SEQCTL,0x10 /* FASTMODE */ 188 jmp poll_for_work | 157 call add_scb_to_disc_list; 158 mvi SEQCTL, FASTMODE; 159 jmp poll_for_work; 160.endif |
189simple_busy_link: | 161simple_busy_link: |
190 mov SCBPTR, ARG_1 191 mov SCB_LINKED_NEXT, CUR_SCBID 192 mvi SEQCTL,0x10 /* FASTMODE */ 193 jmp poll_for_work | 162 mov SCBPTR, ARG_1; 163 mov SCB_LINKED_NEXT, CUR_SCBID; 164 mvi SEQCTL, FASTMODE; 165 jmp poll_for_work; |
194make_busy: | 166make_busy: |
195 mov DINDIR, CUR_SCBID 196 mov SCBPTR, SAVED_SCBPTR 197 mvi SEQCTL,0x10 /* FASTMODE */ | 167 mov DINDIR, CUR_SCBID; 168 mov SCBPTR, SAVED_SCBPTR; 169 mvi SEQCTL, FASTMODE; |
198 199start_scb: 200 /* 201 * Place us on the waiting list in case our selection 202 * doesn't win during bus arbitration. 203 */ | 170 171start_scb: 172 /* 173 * Place us on the waiting list in case our selection 174 * doesn't win during bus arbitration. 175 */ |
204 mov SCB_NEXT,WAITING_SCBH 205 mov WAITING_SCBH, SCBPTR 206start_scb2: 207 and SINDEX,0xf7,SBLKCTL /* Clear the channel select bit */ 208 and A,0x08,SCB_TCL /* Get new channel bit */ 209 or SINDEX,A 210 mov SBLKCTL,SINDEX /* select channel */ 211 mov SCB_TCL call initialize_scsiid | 176 mov SCB_NEXT,WAITING_SCBH; 177 mov WAITING_SCBH, SCBPTR; 178start_waiting: 179 /* 180 * Pull the first entry off of the waiting SCB list 181 * We don't have to "test_busy" because only transactions that 182 * have passed that test can be in the WAITING_SCB list. 183 */ 184 mov SCBPTR, WAITING_SCBH; 185 call start_selection; 186 jmp poll_for_work; |
212 | 187 |
188start_selection: 189 and SINDEX,~SELBUSB,SBLKCTL;/* Clear the channel select bit */ 190 and A,SELBUSB,SCB_TCL; /* Get new channel bit */ 191 or SINDEX,A; 192 mov SBLKCTL,SINDEX; /* select channel */ 193initialize_scsiid: 194 and A, TID, SCB_TCL; /* Get target ID */ 195 and SCSIID, OID; /* Clear old target */ 196 or SCSIID, A; 197 mvi SCSISEQ, ENSELO|ENAUTOATNO|ENRSELI|ENAUTOATNP ret; |
|
213/* | 198/* |
214 * Enable selection phase as an initiator, and do automatic ATN 215 * after the selection. We do this now so that we can overlap the 216 * rest of our work to set up this target with the arbitration and 217 * selection bus phases. | 199 * Reselection has been initiated by a target. Make a note that we've been 200 * reselected, but haven't seen an IDENTIFY message from the target yet. |
218 */ | 201 */ |
219start_selection: 220 mvi SCSISEQ,0x5a /* ENSELO|ENAUTOATNO|ENRSELI 221 * |ENAUTOATNP 222 */ | 202selection: 203 test SSTAT0, SELDI jz select; 204reselect: 205 clr MSG_LEN; /* Don't have anything in the mesg buffer */ 206 mvi CLRSINT0, CLRSELDI; 207 /* XXX test for and handle ONE BIT condition */ 208 and SAVED_TCL, SELID_MASK, SELID; 209 or SEQ_FLAGS,RESELECTED; 210 jmp select2; |
223 224/* | 211 212/* |
213 * After the selection, remove this SCB from the "waiting SCB" 214 * list. This is achieved by simply moving our "next" pointer into 215 * WAITING_SCBH. Our next pointer will be set to null the next time this 216 * SCB is used, so don't bother with it now. 217 */ 218select: 219 /* Turn off the selection hardware */ 220 mvi SCSISEQ, ENRSELI|ENAUTOATNP; /* 221 * ATN on parity errors 222 * for "in" phases 223 */ 224 mvi CLRSINT0, CLRSELDO; 225 mov SCBPTR, WAITING_SCBH; 226 mov WAITING_SCBH,SCB_NEXT; 227 mov SAVED_TCL, SCB_TCL; 228/* |
|
225 * As soon as we get a successful selection, the target should go 226 * into the message out phase since we have ATN asserted. Prepare 227 * the message to send. 228 * 229 * Messages are stored in scratch RAM starting with a length byte 230 * followed by the message itself. 231 */ 232 233mk_identify: | 229 * As soon as we get a successful selection, the target should go 230 * into the message out phase since we have ATN asserted. Prepare 231 * the message to send. 232 * 233 * Messages are stored in scratch RAM starting with a length byte 234 * followed by the message itself. 235 */ 236 237mk_identify: |
234 and MSG0,0x7,SCB_TCL /* lun */ 235 and A,DISCENB,SCB_CONTROL /* mask off disconnect privledge */ 236 or MSG0,A /* or in disconnect privledge */ 237 or MSG0,MSG_IDENTIFYFLAG 238 mvi MSG_LEN, 1 | 238 and MSG_OUT,0x7,SCB_TCL; /* lun */ 239 and A,DISCENB,SCB_CONTROL; /* mask off disconnect privledge */ 240 or MSG_OUT,A; /* or in disconnect privledge */ 241 or MSG_OUT,MSG_IDENTIFYFLAG; 242 mvi MSG_LEN, 1; |
239 240/* 241 * Send a tag message if TAG_ENB is set in the SCB control block. 242 * Use SCB_TAG (the position in the kernel's SCB array) as the tag value. 243 */ 244mk_tag: | 243 244/* 245 * Send a tag message if TAG_ENB is set in the SCB control block. 246 * Use SCB_TAG (the position in the kernel's SCB array) as the tag value. 247 */ 248mk_tag: |
245 test SCB_CONTROL,TAG_ENB jz mk_message 246 and MSG1,0x23,SCB_CONTROL 247 mov MSG2,SCB_TAG 248 add MSG_LEN,2 /* update message length */ | 249 test SCB_CONTROL,TAG_ENB jz mk_message; 250 and MSG_OUT[1],TAG_ENB|SCB_TAG_TYPE,SCB_CONTROL; 251 mov MSG_OUT[2],SCB_TAG; 252 add MSG_LEN,2; /* update message length */ |
249 250/* 251 * Interrupt the driver, and allow it to tweak the message buffer 252 * if it asks. 253 */ 254mk_message: | 253 254/* 255 * Interrupt the driver, and allow it to tweak the message buffer 256 * if it asks. 257 */ 258mk_message: |
255 test SCB_CONTROL,MK_MESSAGE jz wait_for_selection | 259 test SCB_CONTROL,MK_MESSAGE jz select2; 260 mvi INTSTAT,AWAITING_MSG; |
256 | 261 |
257 mvi INTSTAT,AWAITING_MSG 258 259wait_for_selection: 260 test SSTAT0,SELDO jnz select 261 test SSTAT0,SELDI jz wait_for_selection 262 263/* 264 * Reselection has been initiated by a target. Make a note that we've been 265 * reselected, but haven't seen an IDENTIFY message from the target yet. 266 */ 267reselect: 268 clr MSG_LEN /* Don't have anything in the mesg buffer */ 269 /* XXX test for and handle ONE BIT condition */ 270 and SAVED_TCL, 0xf0, SELID 271 or FLAGS,RESELECTED 272 jmp select2 273 274/* 275 * After the selection, remove this SCB from the "waiting SCB" 276 * list. This is achieved by simply moving our "next" pointer into 277 * WAITING_SCBH. Our next pointer will be set to null the next time this 278 * SCB is used, so don't bother with it now. 279 */ 280select: 281 mov WAITING_SCBH,SCB_NEXT | |
282select2: | 262select2: |
283 /* Turn off the selection hardware */ 284 mvi SCSISEQ, 0x12 /* ENRSELI|ENAUTOATNP 285 * ATN on parity errors 286 * for "in" phases 287 */ 288 mvi CLRSINT0,0x60 /* CLRSELDI|CLRSELDO */ 289 mvi CLRSINT1,CLRBUSFREE 290 or SIMODE1, ENBUSFREE /* | 263 mvi CLRSINT1,CLRBUSFREE; 264 or SIMODE1, ENBUSFREE; /* |
291 * We aren't expecting a 292 * bus free, so interrupt 293 * the kernel driver if it 294 * happens. 295 */ 296/* 297 * Initialize Ultra mode setting and clear the SCSI channel. 298 */ | 265 * We aren't expecting a 266 * bus free, so interrupt 267 * the kernel driver if it 268 * happens. 269 */ 270/* 271 * Initialize Ultra mode setting and clear the SCSI channel. 272 */ |
299 or SXFRCTL0, 0x1a /* CLRSTCNT|SPIOEN|CLRCHN */ | 273 or SXFRCTL0, CLRSTCNT|SPIOEN|CLRCHN; 274.if ( ULTRA ) |
300ultra: | 275ultra: |
301 mvi SINDEX, ULTRA_ENB_B 302 test SAVED_TCL, 0x80 jnz ultra_2 /* Target ID > 7 */ 303 test SBLKCTL, SELBUSB jnz ultra_2 /* Second channel */ 304 dec SINDEX | 276 mvi SINDEX, ULTRA_ENB+1; 277 test SAVED_TCL, 0x80 jnz ultra_2; /* Target ID > 7 */ 278 dec SINDEX; |
305ultra_2: | 279ultra_2: |
306 mov FUNCTION1,SAVED_TCL 307 mov A,FUNCTION1 308 test SINDIR, A jz ndx_dtr 309 or SXFRCTL0, FAST20 | 280 mov FUNCTION1,SAVED_TCL; 281 mov A,FUNCTION1; 282 test SINDIR, A jz ndx_dtr; 283 or SXFRCTL0, FAST20; 284.endif |
310 311/* 312 * Initialize SCSIRATE with the appropriate value for this target. 313 * The SCSIRATE settings for each target are stored in an array 314 * based at TARG_SCRATCH. 315 */ 316ndx_dtr: | 285 286/* 287 * Initialize SCSIRATE with the appropriate value for this target. 288 * The SCSIRATE settings for each target are stored in an array 289 * based at TARG_SCRATCH. 290 */ 291ndx_dtr: |
317 shr A,SAVED_TCL,4 318 test SBLKCTL,SELBUSB jz ndx_dtr_2 319 or SAVED_TCL, SELBUSB /* Add the channel bit while we're here */ 320 or A,0x08 /* Channel B entries add 8 */ | 292 shr A,4,SAVED_TCL; 293 test SBLKCTL,SELBUSB jz ndx_dtr_2; 294 or SAVED_TCL, SELBUSB; /* Add the channel bit while we're here */ 295 or A,0x08; /* Channel B entries add 8 */ |
321ndx_dtr_2: | 296ndx_dtr_2: |
322 add SINDEX,TARG_SCRATCH,A 323 mov SCSIRATE,SINDIR | 297 add SINDEX,TARG_SCRATCH,A; 298 mov SCSIRATE,SINDIR; |
324 325 326/* 327 * Main loop for information transfer phases. If BSY is false, then 328 * we have a bus free condition, expected or not. Otherwise, wait 329 * for the target to assert REQ before checking MSG, C/D and I/O 330 * for the bus phase. 331 * 332 */ 333ITloop: | 299 300 301/* 302 * Main loop for information transfer phases. If BSY is false, then 303 * we have a bus free condition, expected or not. Otherwise, wait 304 * for the target to assert REQ before checking MSG, C/D and I/O 305 * for the bus phase. 306 * 307 */ 308ITloop: |
334 test SSTAT1,0x9 jz ITloop /* REQINIT|BUSFREE */ 335 test SSTAT1,BUSFREE jnz p_busfree | 309 test SSTAT1,REQINIT jz ITloop; |
336 | 310 |
337 and A,PHASE_MASK,SCSISIGI 338 mov LASTPHASE,A 339 mov SCSISIGO,A | 311 and A,PHASE_MASK,SCSISIGI; 312 mov LASTPHASE,A; 313 mov SCSISIGO,A; |
340 | 314 |
341 cmp ALLZEROS,A je p_dataout 342 cmp A,P_DATAIN je p_datain 343 cmp A,P_COMMAND je p_command 344 cmp A,P_MESGOUT je p_mesgout 345 cmp A,P_STATUS je p_status 346 cmp A,P_MESGIN je p_mesgin | 315 cmp ALLZEROS,A je p_dataout; 316 cmp A,P_DATAIN je p_datain; 317 cmp A,P_COMMAND je p_command; 318 cmp A,P_MESGOUT je p_mesgout; 319 cmp A,P_STATUS je p_status; 320 cmp A,P_MESGIN je p_mesgin; |
347 | 321 |
348 mvi INTSTAT,BAD_PHASE /* unknown phase - signal driver */ 349 jmp ITloop /* Try reading the bus again. */ | 322 mvi INTSTAT,BAD_PHASE; /* unknown phase - signal driver */ 323 jmp ITloop; /* Try reading the bus again. */ |
350 | 324 |
325await_busfree: 326 and SIMODE1, ~ENBUSFREE; 327 mov NONE, SCSIDATL; /* Ack the last byte */ 328 call clear_target_state; 329 test SSTAT1,REQINIT|BUSFREE jz .; 330 test SSTAT1, BUSFREE jnz poll_for_work; 331 mvi INTSTAT, BAD_PHASE; 332 333clear_target_state: 334 clr DFCNTRL; 335 clr SCSIRATE; /* 336 * We don't know the target we will 337 * connect to, so default to narrow 338 * transfers to avoid parity problems. 339 */ 340 and SXFRCTL0, ~FAST20; 341 mvi LASTPHASE, P_BUSFREE; 342 /* clear target specific flags */ 343 and SEQ_FLAGS,~(RESELECTED|IDENTIFY_SEEN|TAGGED_SCB|DPHASE) ret; 344 |
|
351p_dataout: | 345p_dataout: |
352 mvi DMAPARAMS,0x7d /* 353 * WIDEODD|SCSIEN|SDMAEN|HDMAEN| 354 * DIRECTION|FIFORESET 355 */ 356 jmp data_phase_init | 346 mvi DMAPARAMS, WIDEODD|SCSIEN|SDMAEN|HDMAEN|DIRECTION|FIFORESET; 347 jmp data_phase_init; |
357 358/* 359 * If we re-enter the data phase after going through another phase, the 360 * STCNT may have been cleared, so restore it from the residual field. 361 */ 362data_phase_reinit: | 348 349/* 350 * If we re-enter the data phase after going through another phase, the 351 * STCNT may have been cleared, so restore it from the residual field. 352 */ 353data_phase_reinit: |
363 mvi DINDEX, STCNT0 364 mvi SCB_RESID_DCNT0 call bcopy_3 365 jmp data_phase_loop | 354 mvi DINDEX, STCNT; 355 mvi SCB_RESID_DCNT call bcopy_3; 356 jmp data_phase_loop; |
366 367p_datain: | 357 358p_datain: |
368 mvi DMAPARAMS,0x79 /* 369 * WIDEODD|SCSIEN|SDMAEN|HDMAEN| 370 * !DIRECTION|FIFORESET 371 */ | 359 mvi DMAPARAMS, WIDEODD|SCSIEN|SDMAEN|HDMAEN|FIFORESET; |
372data_phase_init: | 360data_phase_init: |
373 call assert /* | 361 call assert; /* |
374 * Ensure entering a data 375 * phase is okay - seen identify, etc. 376 */ 377 | 362 * Ensure entering a data 363 * phase is okay - seen identify, etc. 364 */ 365 |
378 test FLAGS, DPHASE jnz data_phase_reinit | 366 test SEQ_FLAGS, DPHASE jnz data_phase_reinit; |
379 380 /* 381 * Initialize the DMA address and counter from the SCB. 382 * Also set SG_COUNT and SG_NEXT in memory since we cannot 383 * modify the values in the SCB itself until we see a 384 * save data pointers message. 385 */ | 367 368 /* 369 * Initialize the DMA address and counter from the SCB. 370 * Also set SG_COUNT and SG_NEXT in memory since we cannot 371 * modify the values in the SCB itself until we see a 372 * save data pointers message. 373 */ |
386 mvi DINDEX, HADDR0 387 mvi SCB_DATAPTR call bcopy_7 | 374 mvi DINDEX, HADDR; 375 mvi SCB_DATAPTR call bcopy_7; |
388 | 376 |
389 call set_stcnt_from_hcnt | 377 call set_stcnt_from_hcnt; |
390 | 378 |
391 mov SG_COUNT,SCB_SGCOUNT | 379 mov SG_COUNT,SCB_SGCOUNT; |
392 | 380 |
393 mvi DINDEX, SG_NEXT 394 mvi SCB_SGPTR call bcopy_4 | 381 mvi DINDEX, SG_NEXT; 382 mvi SCB_SGPTR call bcopy_4; |
395 396data_phase_loop: 397/* Guard against overruns */ | 383 384data_phase_loop: 385/* Guard against overruns */ |
398 test SG_COUNT, 0xff jnz data_phase_inbounds | 386 test SG_COUNT, 0xff jnz data_phase_inbounds; |
399/* 400 * Turn on 'Bit Bucket' mode, set the transfer count to 401 * 16meg and let the target run until it changes phase. 402 * When the transfer completes, notify the host that we 403 * had an overrun. 404 */ | 387/* 388 * Turn on 'Bit Bucket' mode, set the transfer count to 389 * 16meg and let the target run until it changes phase. 390 * When the transfer completes, notify the host that we 391 * had an overrun. 392 */ |
405 or SXFRCTL1,BITBUCKET 406 mvi HCNT0, 0xff 407 mvi HCNT1, 0xff 408 mvi HCNT2, 0xff 409 call set_stcnt_from_hcnt | 393 or SXFRCTL1,BITBUCKET; 394 mvi HCNT[0], 0xff; 395 mvi HCNT[1], 0xff; 396 mvi HCNT[2], 0xff; 397 call set_stcnt_from_hcnt; |
410 411data_phase_inbounds: 412/* If we are the last SG block, ensure wideodd is off. */ | 398 399data_phase_inbounds: 400/* If we are the last SG block, ensure wideodd is off. */ |
413 cmp SG_COUNT,0x01 jne data_phase_wideodd 414 and DMAPARAMS, 0xbf /* Turn off WIDEODD */ | 401 cmp SG_COUNT,0x01 jne data_phase_wideodd; 402 and DMAPARAMS, ~WIDEODD; |
415data_phase_wideodd: | 403data_phase_wideodd: |
416 mov DMAPARAMS call dma | 404 mov DMAPARAMS call dma; |
417 418/* Go tell the host about any overruns */ | 405 406/* Go tell the host about any overruns */ |
419 test SXFRCTL1,BITBUCKET jnz data_phase_overrun | 407 test SXFRCTL1,BITBUCKET jnz data_phase_overrun; |
420 421/* Exit if we had an underrun. dma clears SINDEX in this case. */ | 408 409/* Exit if we had an underrun. dma clears SINDEX in this case. */ |
422 test SINDEX,0xff jz data_phase_finish | 410 test SINDEX,0xff jz data_phase_finish; |
423 424/* 425 * Advance the scatter-gather pointers if needed 426 */ 427sg_advance: | 411 412/* 413 * Advance the scatter-gather pointers if needed 414 */ 415sg_advance: |
428 dec SG_COUNT /* one less segment to go */ | 416 dec SG_COUNT; /* one less segment to go */ |
429 | 417 |
430 test SG_COUNT, 0xff jz data_phase_finish /* Are we done? */ | 418 test SG_COUNT, 0xff jz data_phase_finish; /* Are we done? */ |
431 | 419 |
432 clr A /* add sizeof(struct scatter) */ 433 add SG_NEXT0,SG_SIZEOF,SG_NEXT0 434 adc SG_NEXT1,A,SG_NEXT1 | 420 clr A; /* add sizeof(struct scatter) */ 421 add SG_NEXT[0],SG_SIZEOF; 422 adc SG_NEXT[1],A; |
435 436/* 437 * Load a struct scatter and set up the data address and length. 438 * If the working value of the SG count is nonzero, then 439 * we need to load a new set of values. 440 * 441 * This, like all DMA's, assumes little-endian host data storage. 442 */ 443sg_load: | 423 424/* 425 * Load a struct scatter and set up the data address and length. 426 * If the working value of the SG count is nonzero, then 427 * we need to load a new set of values. 428 * 429 * This, like all DMA's, assumes little-endian host data storage. 430 */ 431sg_load: |
444 mvi DINDEX, HADDR0 445 mvi SG_NEXT0 call bcopy_4 | 432 mvi DINDEX, HADDR; 433 mvi SG_NEXT call bcopy_4; |
446 | 434 |
447 mvi HCNT0,SG_SIZEOF 448 clr HCNT1 449 clr HCNT2 | 435 mvi HCNT[0],SG_SIZEOF; 436 clr HCNT[1]; 437 clr HCNT[2]; |
450 | 438 |
451 or DFCNTRL,0xd /* HDMAEN|DIRECTION|FIFORESET */ | 439 or DFCNTRL, HDMAEN|DIRECTION|FIFORESET; |
452 | 440 |
453 call dma_finish | 441 call dma_finish; |
454 455/* 456 * Copy data from FIFO into SCB data pointer and data count. This assumes 457 * that the SG segments are of the form: 458 * 459 * struct ahc_dma_seg { 460 * u_int32_t addr; four bytes, little-endian order 461 * u_int32_t len; four bytes, little endian order 462 * }; 463 */ | 442 443/* 444 * Copy data from FIFO into SCB data pointer and data count. This assumes 445 * that the SG segments are of the form: 446 * 447 * struct ahc_dma_seg { 448 * u_int32_t addr; four bytes, little-endian order 449 * u_int32_t len; four bytes, little endian order 450 * }; 451 */ |
464 mvi HADDR0 call dfdat_in_7 | 452 mvi HADDR call dfdat_in_7; |
465 466/* Load STCNT as well. It is a mirror of HCNT */ | 453 454/* Load STCNT as well. It is a mirror of HCNT */ |
467 call set_stcnt_from_hcnt 468 test SSTAT1,PHASEMIS jz data_phase_loop | 455 call set_stcnt_from_hcnt; 456 test SSTAT1,PHASEMIS jz data_phase_loop; |
469 470data_phase_finish: 471/* 472 * After a DMA finishes, save the SG and STCNT residuals back into the SCB 473 * We use STCNT instead of HCNT, since it's a reflection of how many bytes 474 * were transferred on the SCSI (as opposed to the host) bus. 475 */ | 457 458data_phase_finish: 459/* 460 * After a DMA finishes, save the SG and STCNT residuals back into the SCB 461 * We use STCNT instead of HCNT, since it's a reflection of how many bytes 462 * were transferred on the SCSI (as opposed to the host) bus. 463 */ |
476 mov SCB_RESID_DCNT0,STCNT0 477 mov SCB_RESID_DCNT1,STCNT1 478 mov SCB_RESID_DCNT2,STCNT2 479 mov SCB_RESID_SGCNT, SG_COUNT | 464 mov SCB_RESID_DCNT[0],STCNT[0]; 465 mov SCB_RESID_DCNT[1],STCNT[1]; 466 mov SCB_RESID_DCNT[2],STCNT[2]; 467 mov SCB_RESID_SGCNT, SG_COUNT; |
480 481 /* We have seen a data phase */ | 468 469 /* We have seen a data phase */ |
482 or FLAGS, DPHASE | 470 or SEQ_FLAGS, DPHASE; |
483 | 471 |
484 jmp ITloop | 472 jmp ITloop; |
485 486data_phase_overrun: 487/* 488 * Turn off BITBUCKET mode and notify the host 489 */ | 473 474data_phase_overrun: 475/* 476 * Turn off BITBUCKET mode and notify the host 477 */ |
490 and SXFRCTL1,0x7f /* ~BITBUCKET */ 491 mvi INTSTAT,DATA_OVERRUN 492 jmp ITloop | 478 and SXFRCTL1, ~BITBUCKET; 479 mvi INTSTAT,DATA_OVERRUN; 480 jmp ITloop; |
493 494/* 495 * Command phase. Set up the DMA registers and let 'er rip. 496 */ 497p_command: | 481 482/* 483 * Command phase. Set up the DMA registers and let 'er rip. 484 */ 485p_command: |
498 call assert | 486 call assert; |
499 500/* 501 * Load HADDR and HCNT. 502 */ | 487 488/* 489 * Load HADDR and HCNT. 490 */ |
503 mvi DINDEX, HADDR0 504 mvi SCB_CMDPTR call bcopy_5 505 clr HCNT1 506 clr HCNT2 | 491 mvi DINDEX, HADDR; 492 mvi SCB_CMDPTR call bcopy_5; 493 clr HCNT[1]; 494 clr HCNT[2]; |
507 | 495 |
508 call set_stcnt_from_hcnt | 496 call set_stcnt_from_hcnt; |
509 | 497 |
510 mvi 0x3d call dma /* SCSIEN|SDMAEN|HDMAEN 511 * |DIRECTION|FIFORESET 512 */ 513 jmp ITloop | 498 mvi (SCSIEN|SDMAEN|HDMAEN|DIRECTION|FIFORESET) call dma; 499 jmp ITloop; |
514 515/* 516 * Status phase. Wait for the data byte to appear, then read it 517 * and store it into the SCB. 518 */ 519p_status: | 500 501/* 502 * Status phase. Wait for the data byte to appear, then read it 503 * and store it into the SCB. 504 */ 505p_status: |
520 call assert | 506 call assert; |
521 | 507 |
522 mov SCB_TARGET_STATUS, SCSIDATL 523 jmp ITloop | 508 mov SCB_TARGET_STATUS, SCSIDATL; 509 jmp ITloop; |
524 525/* 526 * Message out phase. If there is not an active message, but the target 527 * took us into this phase anyway, build a no-op message and send it. 528 */ 529p_mesgout: | 510 511/* 512 * Message out phase. If there is not an active message, but the target 513 * took us into this phase anyway, build a no-op message and send it. 514 */ 515p_mesgout: |
530 test MSG_LEN, 0xff jnz p_mesgout_start 531 mvi MSG_NOOP call mk_mesg /* build NOP message */ | 516 test MSG_LEN, 0xff jnz p_mesgout_start; 517 mvi MSG_NOOP call mk_mesg; /* build NOP message */ |
532p_mesgout_start: 533/* | 518p_mesgout_start: 519/* |
534 * Set up automatic PIO transfer from MSG0. Bit 3 in | 520 * Set up automatic PIO transfer from MSG_OUT. Bit 3 in |
535 * SXFRCTL0 (SPIOEN) is already on. 536 */ | 521 * SXFRCTL0 (SPIOEN) is already on. 522 */ |
537 mvi SINDEX,MSG0 538 mov DINDEX,MSG_LEN | 523 mvi SINDEX,MSG_OUT; 524 mov DINDEX,MSG_LEN; |
539 540/* 541 * When target asks for a byte, drop ATN if it's the last one in 542 * the message. Otherwise, keep going until the message is exhausted. | 525 526/* 527 * When target asks for a byte, drop ATN if it's the last one in 528 * the message. Otherwise, keep going until the message is exhausted. |
529 * ATN must be dropped *at least* 90ns before we ack the last byte, so 530 * the code is aranged to execute two instructions before the byte is 531 * transferred to give a good margin of safety |
|
543 * 544 * Keep an eye out for a phase change, in case the target issues 545 * a MESSAGE REJECT. 546 */ 547p_mesgout_loop: | 532 * 533 * Keep an eye out for a phase change, in case the target issues 534 * a MESSAGE REJECT. 535 */ 536p_mesgout_loop: |
548 test SSTAT1, REQINIT jz p_mesgout_loop 549 and LASTPHASE, PHASE_MASK, SCSISIGI 550 cmp LASTPHASE, P_MESGOUT jne p_mesgout_done | 537 test SSTAT1, REQINIT jz p_mesgout_loop; 538 and LASTPHASE, PHASE_MASK, SCSISIGI; 539 cmp LASTPHASE, P_MESGOUT jne p_mesgout_done; |
551/* 552 * If the next bus phase after ATN drops is a message out, it means 553 * that the target is requesting that the last message(s) be resent. 554 */ | 540/* 541 * If the next bus phase after ATN drops is a message out, it means 542 * that the target is requesting that the last message(s) be resent. 543 */ |
555p_mesgout_testretry: 556 test DINDEX,0xff jnz p_mesgout_dropatn 557 or SCSISIGO,ATNO,LASTPHASE /* turn on ATN for the retry */ 558 jmp p_mesgout_start | |
559p_mesgout_dropatn: | 544p_mesgout_dropatn: |
560 cmp DINDEX,1 jne p_mesgout_outb /* last byte? */ 561 mvi CLRSINT1,CLRATNO /* drop ATN */ | 545 cmp DINDEX,1 jne p_mesgout_testretry;/* last byte? */ 546 mvi CLRSINT1,CLRATNO; /* drop ATN */ 547p_mesgout_testretry: 548 test DINDEX,0xff jnz p_mesgout_outb; 549 or SCSISIGO,ATNO,LASTPHASE;/* turn on ATN for the retry */ 550 jmp p_mesgout_start; |
562p_mesgout_outb: | 551p_mesgout_outb: |
563 mov SCSIDATL,SINDIR 564 dec DINDEX 565 jmp p_mesgout_loop | 552 dec DINDEX; 553 mov SCSIDATL,SINDIR; 554 jmp p_mesgout_loop; |
566 567p_mesgout_done: | 555 556p_mesgout_done: |
568 mvi CLRSINT1,CLRATNO /* Be sure to turn ATNO off */ 569 clr MSG_LEN /* no active msg */ 570 jmp ITloop | 557 mvi CLRSINT1,CLRATNO; /* Be sure to turn ATNO off */ 558 clr MSG_LEN; /* no active msg */ 559 jmp ITloop; |
571 572/* 573 * Message in phase. Bytes are read using Automatic PIO mode. 574 */ 575p_mesgin: | 560 561/* 562 * Message in phase. Bytes are read using Automatic PIO mode. 563 */ 564p_mesgin: |
576 mvi A call inb_first /* read the 1st message byte */ 577 mov REJBYTE,A /* save it for the driver */ | 565 mvi ACCUM call inb_first; /* read the 1st message byte */ 566 mov REJBYTE,A; /* save it for the driver */ |
578 | 567 |
579 test A,MSG_IDENTIFYFLAG jnz mesgin_identify 580 cmp A,MSG_DISCONNECT je mesgin_disconnect 581 cmp A,MSG_SAVEDATAPOINTER je mesgin_sdptrs 582 cmp ALLZEROS,A je mesgin_complete 583 cmp A,MSG_RESTOREPOINTERS je mesgin_rdptrs 584 cmp A,MSG_EXTENDED je mesgin_extended 585 cmp A,MSG_MESSAGE_REJECT je mesgin_reject 586 cmp A,MSG_NOOP je mesgin_done | 568 test A,MSG_IDENTIFYFLAG jnz mesgin_identify; 569 cmp A,MSG_DISCONNECT je mesgin_disconnect; 570 cmp A,MSG_SAVEDATAPOINTER je mesgin_sdptrs; 571 cmp ALLZEROS,A je mesgin_complete; 572 cmp A,MSG_RESTOREPOINTERS je mesgin_rdptrs; 573 cmp A,MSG_EXTENDED je mesgin_extended; 574 cmp A,MSG_MESSAGE_REJECT je mesgin_reject; 575 cmp A,MSG_NOOP je mesgin_done; |
587 588rej_mesgin: 589/* 590 * We have no idea what this message in is, so we issue a message reject 591 * and hope for the best. In any case, rejection should be a rare 592 * occurrence - signal the driver when it happens. 593 */ | 576 577rej_mesgin: 578/* 579 * We have no idea what this message in is, so we issue a message reject 580 * and hope for the best. In any case, rejection should be a rare 581 * occurrence - signal the driver when it happens. 582 */ |
594 mvi INTSTAT,SEND_REJECT /* let driver know */ | 583 mvi INTSTAT,SEND_REJECT; /* let driver know */ |
595 | 584 |
596 mvi MSG_MESSAGE_REJECT call mk_mesg | 585 mvi MSG_MESSAGE_REJECT call mk_mesg; |
597 598mesgin_done: | 586 587mesgin_done: |
599 call inb_last 600 jmp ITloop | 588 mov NONE,SCSIDATL; /*dummy read from latch to ACK*/ 589 jmp ITloop; |
601 602 603mesgin_complete: 604/* 605 * We got a "command complete" message, so put the SCB_TAG into the QOUTFIFO, 606 * and trigger a completion interrupt. Before doing so, check to see if there 607 * is a residual or the status byte is something other than NO_ERROR (0). In 608 * either of these conditions, we upload the SCB back to the host so it can --- 6 unchanged lines hidden (view full) --- 615 * If the kernel driver does not wish to request sense, it need only clear 616 * RETURN_1, and the command is allowed to complete normally. We don't bother 617 * to post to the QOUTFIFO in the error cases since it would require extra 618 * work in the kernel driver to ensure that the entry was removed before the 619 * command complete code tried processing it. 620 */ 621 622/* | 590 591 592mesgin_complete: 593/* 594 * We got a "command complete" message, so put the SCB_TAG into the QOUTFIFO, 595 * and trigger a completion interrupt. Before doing so, check to see if there 596 * is a residual or the status byte is something other than NO_ERROR (0). In 597 * either of these conditions, we upload the SCB back to the host so it can --- 6 unchanged lines hidden (view full) --- 604 * If the kernel driver does not wish to request sense, it need only clear 605 * RETURN_1, and the command is allowed to complete normally. We don't bother 606 * to post to the QOUTFIFO in the error cases since it would require extra 607 * work in the kernel driver to ensure that the entry was removed before the 608 * command complete code tried processing it. 609 */ 610 611/* |
623 * We expect to go to bus free after this message. 624 */ 625 and SIMODE1, 0xf7 /* ~ENBUSFREE */ 626/* | |
627 * First check for residuals 628 */ | 612 * First check for residuals 613 */ |
629 test SCB_RESID_SGCNT,0xff jnz upload_scb 630 test SCB_TARGET_STATUS,0xff jz status_ok /* Good Status? */ | 614 test SCB_RESID_SGCNT,0xff jnz upload_scb; 615 test SCB_TARGET_STATUS,0xff jz status_ok; /* Good Status? */ |
631upload_scb: | 616upload_scb: |
632 mvi DMAPARAMS, 0x9 /* HDMAEN | FIFORESET*/ 633 mov SCB_TAG call dma_scb | 617 mvi DMAPARAMS, FIFORESET; 618 mov SCB_TAG call dma_scb; |
634check_status: | 619check_status: |
635 test SCB_TARGET_STATUS,0xff jz status_ok /* Just a residual? */ 636 mvi INTSTAT,BAD_STATUS /* let driver know */ 637 cmp RETURN_1, SEND_SENSE jne status_ok | 620 test SCB_TARGET_STATUS,0xff jz status_ok; /* Just a residual? */ 621 mvi INTSTAT,BAD_STATUS; /* let driver know */ 622 cmp RETURN_1, SEND_SENSE jne status_ok; |
638 /* This SCB becomes the next to execute as it will retrieve sense */ | 623 /* This SCB becomes the next to execute as it will retrieve sense */ |
639 mov SCB_LINKED_NEXT, SCB_TAG 640 jmp dma_next_scb | 624 mov SCB_LINKED_NEXT, SCB_TAG; 625 jmp dma_next_scb; |
641 642status_ok: 643/* First, mark this target as free. */ | 626 627status_ok: 628/* First, mark this target as free. */ |
644 test SCB_CONTROL,TAG_ENB jnz complete /* | 629 test SCB_CONTROL,TAG_ENB jnz complete; /* |
645 * Tagged commands 646 * don't busy the 647 * target. 648 */ | 630 * Tagged commands 631 * don't busy the 632 * target. 633 */ |
649 mov SAVED_SCBPTR, SCBPTR 650 mov SAVED_LINKPTR, SCB_LINKED_NEXT 651 mov SCB_TCL call index_untagged_scb 652 mov DINDIR, SAVED_LINKPTR 653 mov SCBPTR, SAVED_SCBPTR | 634 mov SAVED_SCBPTR, SCBPTR; 635 mov SAVED_LINKPTR, SCB_LINKED_NEXT; 636 mov SCB_TCL call index_untagged_scb; 637 mov DINDIR, SAVED_LINKPTR; 638 mov SCBPTR, SAVED_SCBPTR; |
654 655complete: 656 /* Post the SCB and issue an interrupt */ | 639 640complete: 641 /* Post the SCB and issue an interrupt */ |
657 mov QOUTFIFO,SCB_TAG 658 mvi INTSTAT,CMDCMPLT 659 test SCB_CONTROL, ABORT_SCB jz dma_next_scb 660 mvi INTSTAT ABORT_CMDCMPLT | 642 mov QOUTFIFO,SCB_TAG; 643 mvi INTSTAT,CMDCMPLT; 644 test SCB_CONTROL, ABORT_SCB jz dma_next_scb; 645 mvi INTSTAT, ABORT_CMDCMPLT; |
661 662dma_next_scb: | 646 647dma_next_scb: |
663 cmp SCB_LINKED_NEXT, SCB_LIST_NULL je add_to_free_list 664 test FLAGS, PAGESCBS jnz dma_next_scb2 | 648 cmp SCB_LINKED_NEXT, SCB_LIST_NULL je add_to_free_list; 649.if !( SCB_PAGING ) |
665 /* Only DMA on top of ourselves if we are the SCB to download */ | 650 /* Only DMA on top of ourselves if we are the SCB to download */ |
666 mov A, SCB_LINKED_NEXT 667 cmp SCB_TAG, A je dma_next_scb2 668 mov SCBPTR, A 669 jmp add_to_waiting_list | 651 mov A, SCB_LINKED_NEXT; 652 cmp SCB_TAG, A je dma_next_scb2; 653 mov SCBPTR, A; 654 jmp add_to_waiting_list; 655.endif |
670dma_next_scb2: | 656dma_next_scb2: |
671 mvi DMAPARAMS, 0xd /* HDMAEN|DIRECTION|FIFORESET */ 672 mov SCB_LINKED_NEXT call dma_scb | 657 mvi DMAPARAMS, HDMAEN|DIRECTION|FIFORESET; 658 mov SCB_LINKED_NEXT call dma_scb; |
673add_to_waiting_list: | 659add_to_waiting_list: |
674 mov SCB_NEXT,WAITING_SCBH 675 mov WAITING_SCBH, SCBPTR 676 jmp mesgin_done | 660 mov SCB_NEXT,WAITING_SCBH; 661 mov WAITING_SCBH, SCBPTR; 662 /* 663 * Prepare our selection hardware before the busfree so we have a 664 * high probability of winning arbitration. 665 */ 666 call start_selection; 667 jmp await_busfree; |
677add_to_free_list: | 668add_to_free_list: |
678 call add_scb_to_free_list 679 jmp mesgin_done | 669 call add_scb_to_free_list; 670 jmp await_busfree; |
680 681/* 682 * Is it an extended message? Copy the message to our message buffer and 683 * notify the host. The host will tell us whether to reject this message, 684 * respond to it with the message that the host placed in our message buffer, 685 * or simply to do nothing. 686 */ 687mesgin_extended: | 671 672/* 673 * Is it an extended message? Copy the message to our message buffer and 674 * notify the host. The host will tell us whether to reject this message, 675 * respond to it with the message that the host placed in our message buffer, 676 * or simply to do nothing. 677 */ 678mesgin_extended: |
688 mvi MSGIN_EXT_LEN call inb_next 689 mov A, MSGIN_EXT_LEN | 679 mvi MSGIN_EXT_LEN call inb_next; 680 mov A, MSGIN_EXT_LEN; |
690mesgin_extended_loop: | 681mesgin_extended_loop: |
691 mov DINDEX call inb_next 692 dec A 693 cmp DINDEX, MSGIN_EXT_LASTBYTE jne mesgin_extended_loop_test 694 dec DINDEX /* dump by repeatedly filling the last byte */ | 682 mov DINDEX call inb_next; 683 dec A; 684 cmp DINDEX, MSGIN_EXT_BYTES+3 jne mesgin_extended_loop_test; 685 dec DINDEX; /* dump by repeatedly filling the last byte */ |
695mesgin_extended_loop_test: | 686mesgin_extended_loop_test: |
696 test A, 0xFF jnz mesgin_extended_loop | 687 test A, 0xFF jnz mesgin_extended_loop; |
697mesgin_extended_intr: | 688mesgin_extended_intr: |
698 mvi INTSTAT,EXTENDED_MSG /* let driver know */ 699 cmp RETURN_1,SEND_REJ je rej_mesgin 700 cmp RETURN_1,SEND_MSG jne mesgin_done | 689 mvi INTSTAT,EXTENDED_MSG; /* let driver know */ 690 cmp RETURN_1,SEND_REJ je rej_mesgin; 691 cmp RETURN_1,SEND_MSG jne mesgin_done; |
701/* The kernel has setup a message to be sent */ | 692/* The kernel has setup a message to be sent */ |
702 or SCSISIGO,ATNO,LASTPHASE /* turn on ATNO */ 703 jmp mesgin_done | 693 or SCSISIGO,ATNO,LASTPHASE; /* turn on ATNO */ 694 jmp mesgin_done; |
704 705/* 706 * Is it a disconnect message? Set a flag in the SCB to remind us 707 * and await the bus going free. 708 */ 709mesgin_disconnect: | 695 696/* 697 * Is it a disconnect message? Set a flag in the SCB to remind us 698 * and await the bus going free. 699 */ 700mesgin_disconnect: |
710 and SIMODE1, 0xf7 /* ~ENBUSFREE */ 711 or SCB_CONTROL,DISCONNECTED 712 test FLAGS, PAGESCBS jz mesgin_done 713 call add_scb_to_disc_list 714 jmp mesgin_done | 701 or SCB_CONTROL,DISCONNECTED; 702.if ( SCB_PAGING ) 703 call add_scb_to_disc_list; 704.endif 705 jmp await_busfree; |
715 716/* 717 * Save data pointers message: 718 * Copying RAM values back to SCB, for Save Data Pointers message, but 719 * only if we've actually been into a data phase to change them. This 720 * protects against bogus data in scratch ram and the residual counts 721 * since they are only initialized when we go into data_in or data_out. 722 */ 723mesgin_sdptrs: | 706 707/* 708 * Save data pointers message: 709 * Copying RAM values back to SCB, for Save Data Pointers message, but 710 * only if we've actually been into a data phase to change them. This 711 * protects against bogus data in scratch ram and the residual counts 712 * since they are only initialized when we go into data_in or data_out. 713 */ 714mesgin_sdptrs: |
724 test FLAGS, DPHASE jz mesgin_done 725 mov SCB_SGCOUNT,SG_COUNT | 715 test SEQ_FLAGS, DPHASE jz mesgin_done; 716 mov SCB_SGCOUNT,SG_COUNT; |
726 727 /* The SCB SGPTR becomes the next one we'll download */ | 717 718 /* The SCB SGPTR becomes the next one we'll download */ |
728 mvi DINDEX, SCB_SGPTR 729 mvi SG_NEXT0 call bcopy_4 | 719 mvi DINDEX, SCB_SGPTR; 720 mvi SG_NEXT call bcopy_4; |
730 731 /* The SCB DATAPTR0 becomes the current SHADDR */ | 721 722 /* The SCB DATAPTR0 becomes the current SHADDR */ |
732 mvi DINDEX, SCB_DATAPTR0 733 mvi SHADDR0 call bcopy_4 | 723 mvi DINDEX, SCB_DATAPTR; 724 mvi SHADDR call bcopy_4; |
734 735/* 736 * Use the residual number since STCNT is corrupted by any message transfer. 737 */ | 725 726/* 727 * Use the residual number since STCNT is corrupted by any message transfer. 728 */ |
738 mvi SCB_RESID_DCNT0 call bcopy_3 | 729 mvi SCB_RESID_DCNT call bcopy_3; |
739 | 730 |
740 jmp mesgin_done | 731 jmp mesgin_done; |
741 742/* 743 * Restore pointers message? Data pointers are recopied from the 744 * SCB anytime we enter a data phase for the first time, so all 745 * we need to do is clear the DPHASE flag and let the data phase 746 * code do the rest. 747 */ 748mesgin_rdptrs: | 732 733/* 734 * Restore pointers message? Data pointers are recopied from the 735 * SCB anytime we enter a data phase for the first time, so all 736 * we need to do is clear the DPHASE flag and let the data phase 737 * code do the rest. 738 */ 739mesgin_rdptrs: |
749 and FLAGS,0xef /* 750 * !DPHASE we'll reload them | 740 and SEQ_FLAGS, ~DPHASE; /* 741 * We'll reload them |
751 * the next time through | 742 * the next time through |
743 * the dataphase. |
|
752 */ | 744 */ |
753 jmp mesgin_done | 745 jmp mesgin_done; |
754 755/* 756 * Identify message? For a reconnecting target, this tells us the lun 757 * that the reconnection is for - find the correct SCB and switch to it, 758 * clearing the "disconnected" bit so we don't "find" it by accident later. 759 */ 760mesgin_identify: | 746 747/* 748 * Identify message? For a reconnecting target, this tells us the lun 749 * that the reconnection is for - find the correct SCB and switch to it, 750 * clearing the "disconnected" bit so we don't "find" it by accident later. 751 */ 752mesgin_identify: |
761 test A,0x78 jnz rej_mesgin /*!DiscPriv|!LUNTAR|!Reserved*/ 762 and A,0x07 /* lun in lower three bits */ 763 or SAVED_TCL,A /* SAVED_TCL should be complete now */ 764 mov SAVED_TCL call index_untagged_scb 765 mov ARG_1, SINDIR 766 cmp ARG_1,SCB_LIST_NULL jne use_findSCB | 753 test A,0x78 jnz rej_mesgin; /*!DiscPriv|!LUNTAR|!Reserved*/ 754 and A,0x07; /* lun in lower three bits */ 755 or SAVED_TCL,A; /* SAVED_TCL should be complete now */ 756 mov SAVED_TCL call index_untagged_scb; 757 mov ARG_1, SINDIR; 758 /* XXX Directly index in the non paging case */ 759 cmp ARG_1,SCB_LIST_NULL jne use_findSCB; |
767/* 768 * Here we "snoop" the bus looking for a SIMPLE QUEUE TAG message. 769 * If we get one, we use the tag returned to find the proper 770 * SCB. With SCB paging, this requires using findSCB for both tagged 771 * and non-tagged transactions since the SCB may exist in any slot. 772 * If we're not using SCB paging, we can use the tag as the direct 773 * index to the SCB. 774 */ | 760/* 761 * Here we "snoop" the bus looking for a SIMPLE QUEUE TAG message. 762 * If we get one, we use the tag returned to find the proper 763 * SCB. With SCB paging, this requires using findSCB for both tagged 764 * and non-tagged transactions since the SCB may exist in any slot. 765 * If we're not using SCB paging, we can use the tag as the direct 766 * index to the SCB. 767 */ |
775 call inb_last /* ACK Identify MSG */ | 768 mov NONE,SCSIDATL; /* ACK Identify MSG */ |
776snoop_tag_loop: | 769snoop_tag_loop: |
777 test SSTAT1,REQINIT jz snoop_tag_loop 778 and LASTPHASE, PHASE_MASK, SCSISIGI 779 cmp LASTPHASE, P_MESGIN jne not_found 780 cmp SCSIBUSL,MSG_SIMPLE_Q_TAG jne not_found | 770 test SSTAT1,REQINIT jz snoop_tag_loop; 771 and LASTPHASE, PHASE_MASK, SCSISIGI; 772 cmp LASTPHASE, P_MESGIN jne not_found; 773 cmp SCSIBUSL,MSG_SIMPLE_Q_TAG jne not_found; |
781get_tag: | 774get_tag: |
782 or FLAGS, TAGGED_SCB 783 mvi ARG_1 call inb_next /* tag value */ | 775 or SEQ_FLAGS, TAGGED_SCB; 776 mvi ARG_1 call inb_next; /* tag value */ |
784/* 785 * See if the tag is in range. The tag is < SCBCOUNT if we add 786 * the complement of SCBCOUNT to the incomming tag and there is 787 * no carry. 788 */ | 777/* 778 * See if the tag is in range. The tag is < SCBCOUNT if we add 779 * the complement of SCBCOUNT to the incomming tag and there is 780 * no carry. 781 */ |
789 mov A,COMP_SCBCOUNT 790 add SINDEX,A,ARG_1 791 jc not_found | 782 mov A,COMP_SCBCOUNT; 783 add SINDEX,A,ARG_1; 784 jc not_found; |
792 | 785 |
786.if ! ( SCB_PAGING ) 787 jmp index_by_tag; 788.endif |
|
793/* 794 * Ensure that the SCB the tag points to is for an SCB transaction 795 * to the reconnecting target. 796 */ | 789/* 790 * Ensure that the SCB the tag points to is for an SCB transaction 791 * to the reconnecting target. 792 */ |
797 test FLAGS, PAGESCBS jz index_by_tag | |
798use_findSCB: | 793use_findSCB: |
799 mov ALLZEROS call findSCB /* Have to search */ 800 cmp SINDEX, SCB_LIST_NULL, je not_found | 794 mov ALLZEROS call findSCB; /* Have to search */ 795 cmp SINDEX, SCB_LIST_NULL je not_found; |
801setup_SCB: | 796setup_SCB: |
802 and SCB_CONTROL,0xfb /* clear disconnect bit in SCB */ 803 or FLAGS,IDENTIFY_SEEN /* make note of IDENTIFY */ 804 jmp mesgin_done | 797 and SCB_CONTROL,~DISCONNECTED; 798 or SEQ_FLAGS,IDENTIFY_SEEN; /* make note of IDENTIFY */ 799 jmp mesgin_done; |
805index_by_tag: | 800index_by_tag: |
806 mov SCBPTR,ARG_1 807 mov A, SAVED_TCL 808 cmp SCB_TCL,A jne not_found 809 test SCB_CONTROL,TAG_ENB jz not_found 810 test SCB_CONTROL,DISCONNECTED jz not_found 811 jmp setup_SCB | 801 mov SCBPTR,ARG_1; 802 mov A, SAVED_TCL; 803 cmp SCB_TCL,A jne not_found; 804 test SCB_CONTROL,TAG_ENB jz not_found; 805 test SCB_CONTROL,DISCONNECTED jz not_found; 806 jmp setup_SCB; |
812 813not_found: | 807 808not_found: |
814 mvi INTSTAT, NO_MATCH | 809 mvi INTSTAT, NO_MATCH; |
815send_abort_msg: | 810send_abort_msg: |
816 test FLAGS, TAGGED_SCB jnz send_abort_tag_msg 817 mvi MSG_ABORT call mk_mesg 818 jmp send_abort_done | 811 test SEQ_FLAGS, TAGGED_SCB jnz send_abort_tag_msg; 812 mvi MSG_ABORT call mk_mesg; 813 jmp send_abort_done; |
819send_abort_tag_msg: | 814send_abort_tag_msg: |
820 mvi MSG_ABORT_TAG call mk_mesg /* ABORT TAG message */ | 815 mvi MSG_ABORT_TAG call mk_mesg; /* ABORT TAG message */ |
821send_abort_done: 822 /* If we don't have the tag ID yet, we're "looking ahead" at state 823 * that hasn't been processed, so don't ack. 824 */ | 816send_abort_done: 817 /* If we don't have the tag ID yet, we're "looking ahead" at state 818 * that hasn't been processed, so don't ack. 819 */ |
825 cmp ARG_1, SCB_LIST_NULL je ITloop 826 jmp mesgin_done | 820 cmp ARG_1, SCB_LIST_NULL je ITloop; 821 jmp mesgin_done; |
827 828/* 829 * Message reject? Let the kernel driver handle this. If we have an 830 * outstanding WDTR or SDTR negotiation, assume that it's a response from 831 * the target selecting 8bit or asynchronous transfer, otherwise just ignore 832 * it since we have no clue what it pertains to. 833 */ 834mesgin_reject: | 822 823/* 824 * Message reject? Let the kernel driver handle this. If we have an 825 * outstanding WDTR or SDTR negotiation, assume that it's a response from 826 * the target selecting 8bit or asynchronous transfer, otherwise just ignore 827 * it since we have no clue what it pertains to. 828 */ 829mesgin_reject: |
835 mvi INTSTAT, REJECT_MSG 836 jmp mesgin_done | 830 mvi INTSTAT, REJECT_MSG; 831 jmp mesgin_done; |
837 838/* 839 * [ ADD MORE MESSAGE HANDLING HERE ] 840 */ 841 842/* 843 * Locking the driver out, build a one-byte message passed in SINDEX 844 * if there is no active message already. SINDEX is returned intact. 845 */ 846mk_mesg: | 832 833/* 834 * [ ADD MORE MESSAGE HANDLING HERE ] 835 */ 836 837/* 838 * Locking the driver out, build a one-byte message passed in SINDEX 839 * if there is no active message already. SINDEX is returned intact. 840 */ 841mk_mesg: |
847 mvi SEQCTL,0x50 /* PAUSEDIS|FASTMODE */ 848 test MSG_LEN,0xff jz mk_mesg1 /* Should always succeed */ | 842 mvi SEQCTL, PAUSEDIS|FASTMODE; 843 test MSG_LEN,0xff jz mk_mesg1; /* Should always succeed */ |
849 850 /* 851 * Hmmm. For some reason the mesg buffer is in use. 852 * Tell the driver. It should look at SINDEX to find 853 * out what we wanted to use the buffer for and resolve 854 * the conflict. 855 */ | 844 845 /* 846 * Hmmm. For some reason the mesg buffer is in use. 847 * Tell the driver. It should look at SINDEX to find 848 * out what we wanted to use the buffer for and resolve 849 * the conflict. 850 */ |
856 mvi SEQCTL,0x10 /* !PAUSEDIS|FASTMODE */ 857 mvi INTSTAT,MSG_BUFFER_BUSY | 851 mvi SEQCTL,FASTMODE; 852 mvi INTSTAT,MSG_BUFFER_BUSY; |
858 859mk_mesg1: | 853 854mk_mesg1: |
860 or SCSISIGO,ATNO,LASTPHASE /* turn on ATNO */ 861 mvi MSG_LEN,1 /* length = 1 */ 862 mov MSG0,SINDEX /* 1-byte message */ 863 mvi SEQCTL,0x10 ret /* !PAUSEDIS|FASTMODE */ | 855 or SCSISIGO,ATNO,LASTPHASE;/* turn on ATNO */ 856 mvi MSG_LEN,1; /* length = 1 */ 857 mov MSG_OUT,SINDEX; /* 1-byte message */ 858 mvi SEQCTL,FASTMODE ret; |
864 865/* 866 * Functions to read data in Automatic PIO mode. 867 * 868 * According to Adaptec's documentation, an ACK is not sent on input from 869 * the target until SCSIDATL is read from. So we wait until SCSIDATL is 870 * latched (the usual way), then read the data byte directly off the bus 871 * using SCSIBUSL. When we have pulled the ATN line, or we just want to 872 * acknowledge the byte, then we do a dummy read from SCISDATL. The SCSI 873 * spec guarantees that the target will hold the data byte on the bus until 874 * we send our ACK. 875 * 876 * The assumption here is that these are called in a particular sequence, 877 * and that REQ is already set when inb_first is called. inb_{first,next} 878 * use the same calling convention as inb. 879 */ 880 881inb_next: | 859 860/* 861 * Functions to read data in Automatic PIO mode. 862 * 863 * According to Adaptec's documentation, an ACK is not sent on input from 864 * the target until SCSIDATL is read from. So we wait until SCSIDATL is 865 * latched (the usual way), then read the data byte directly off the bus 866 * using SCSIBUSL. When we have pulled the ATN line, or we just want to 867 * acknowledge the byte, then we do a dummy read from SCISDATL. The SCSI 868 * spec guarantees that the target will hold the data byte on the bus until 869 * we send our ACK. 870 * 871 * The assumption here is that these are called in a particular sequence, 872 * and that REQ is already set when inb_first is called. inb_{first,next} 873 * use the same calling convention as inb. 874 */ 875 876inb_next: |
882 mov NONE,SCSIDATL /*dummy read from latch to ACK*/ | 877 mov NONE,SCSIDATL; /*dummy read from latch to ACK*/ |
883inb_next_wait: 884 /* 885 * If there is a parity error, wait for the kernel to 886 * see the interrupt and prepare our message response 887 * before continuing. 888 */ | 878inb_next_wait: 879 /* 880 * If there is a parity error, wait for the kernel to 881 * see the interrupt and prepare our message response 882 * before continuing. 883 */ |
889 test SSTAT1, REQINIT jz inb_next_wait 890 test SSTAT1, SCSIPERR jnz inb_next_wait 891 and LASTPHASE, PHASE_MASK, SCSISIGI 892 cmp LASTPHASE, P_MESGIN jne mesgin_phasemis | 884 test SSTAT1, REQINIT jz inb_next_wait; 885 test SSTAT1, SCSIPERR jnz inb_next_wait; 886 and LASTPHASE, PHASE_MASK, SCSISIGI; 887 cmp LASTPHASE, P_MESGIN jne mesgin_phasemis; |
893inb_first: | 888inb_first: |
894 mov DINDEX,SINDEX 895 mov DINDIR,SCSIBUSL ret /*read byte directly from bus*/ | 889 mov DINDEX,SINDEX; 890 mov DINDIR,SCSIBUSL ret; /*read byte directly from bus*/ |
896inb_last: | 891inb_last: |
897 mov NONE,SCSIDATL ret /*dummy read from latch to ACK*/ | 892 mov NONE,SCSIDATL ret; /*dummy read from latch to ACK*/ |
898 899mesgin_phasemis: 900/* 901 * We expected to receive another byte, but the target changed phase 902 */ | 893 894mesgin_phasemis: 895/* 896 * We expected to receive another byte, but the target changed phase 897 */ |
903 mvi INTSTAT, MSGIN_PHASEMIS 904 jmp ITloop | 898 mvi INTSTAT, MSGIN_PHASEMIS; 899 jmp ITloop; |
905 906/* 907 * DMA data transfer. HADDR and HCNT must be loaded first, and 908 * SINDEX should contain the value to load DFCNTRL with - 0x3d for 909 * host->scsi, or 0x39 for scsi->host. The SCSI channel is cleared 910 * during initialization. 911 */ 912dma: | 900 901/* 902 * DMA data transfer. HADDR and HCNT must be loaded first, and 903 * SINDEX should contain the value to load DFCNTRL with - 0x3d for 904 * host->scsi, or 0x39 for scsi->host. The SCSI channel is cleared 905 * during initialization. 906 */ 907dma: |
913 mov DFCNTRL,SINDEX | 908 mov DFCNTRL,SINDEX; |
914dma_loop: | 909dma_loop: |
915 test SSTAT0,DMADONE jnz dma_dmadone 916 test SSTAT1,PHASEMIS jz dma_loop /* ie. underrun */ | 910 test SSTAT0,DMADONE jnz dma_dmadone; 911 test SSTAT1,PHASEMIS jz dma_loop; /* ie. underrun */ |
917dma_phasemis: | 912dma_phasemis: |
918 test SSTAT0,SDONE jnz dma_checkfifo 919 mov SINDEX,ALLZEROS /* Notify caller of phasemiss */ | 913 test SSTAT0,SDONE jnz dma_checkfifo; 914 mov SINDEX,ALLZEROS; /* Notify caller of phasemiss */ |
920 921/* 922 * We will be "done" DMAing when the transfer count goes to zero, or 923 * the target changes the phase (in light of this, it makes sense that 924 * the DMA circuitry doesn't ACK when PHASEMIS is active). If we are 925 * doing a SCSI->Host transfer, the data FIFO should be flushed auto- 926 * magically on STCNT=0 or a phase change, so just wait for FIFO empty 927 * status. 928 */ 929dma_checkfifo: | 915 916/* 917 * We will be "done" DMAing when the transfer count goes to zero, or 918 * the target changes the phase (in light of this, it makes sense that 919 * the DMA circuitry doesn't ACK when PHASEMIS is active). If we are 920 * doing a SCSI->Host transfer, the data FIFO should be flushed auto- 921 * magically on STCNT=0 or a phase change, so just wait for FIFO empty 922 * status. 923 */ 924dma_checkfifo: |
930 test DFCNTRL,DIRECTION jnz dma_fifoempty | 925 test DFCNTRL,DIRECTION jnz dma_fifoempty; |
931dma_fifoflush: | 926dma_fifoflush: |
932 test DFSTATUS,FIFOEMP jz dma_fifoflush | 927 test DFSTATUS,FIFOEMP jz dma_fifoflush; |
933 934dma_fifoempty: 935 /* Don't clobber an inprogress host data transfer */ | 928 929dma_fifoempty: 930 /* Don't clobber an inprogress host data transfer */ |
936 test DFSTATUS, MREQPEND jnz dma_fifoempty | 931 test DFSTATUS, MREQPEND jnz dma_fifoempty; |
937/* 938 * Now shut the DMA enables off and make sure that the DMA enables are 939 * actually off first lest we get an ILLSADDR. 940 */ 941dma_dmadone: | 932/* 933 * Now shut the DMA enables off and make sure that the DMA enables are 934 * actually off first lest we get an ILLSADDR. 935 */ 936dma_dmadone: |
942 and DFCNTRL, 0xc7 /* ~(SCSIEN|SDMAEN|HDMAEN) */ | 937 and DFCNTRL, ~(SCSIEN|SDMAEN|HDMAEN); |
943dma_halt: | 938dma_halt: |
944 test DFCNTRL, 0x38 jnz dma_halt /* (SCSIEN|SDMAEN|HDMAEN) */ | 939 test DFCNTRL, (SCSIEN|SDMAEN|HDMAEN) jnz dma_halt; |
945return: | 940return: |
946 ret | 941 ret; |
947 948/* | 942 943/* |
949 * Common SCSI initialization for selection and reselection. Expects 950 * the target SCSI ID to be in the upper four bits of SINDEX, and A's 951 * contents are stomped on return. 952 */ 953initialize_scsiid: 954 and SINDEX,0xf0 /* Get target ID */ 955 mov SAVED_TCL, SINDEX /* Update the target portion of this */ 956 and A,0x0f,SCSIID 957 or SINDEX,A 958 mov SCSIID,SINDEX ret 959 960/* | |
961 * Assert that if we've been reselected, then we've seen an IDENTIFY 962 * message. 963 */ 964assert: | 944 * Assert that if we've been reselected, then we've seen an IDENTIFY 945 * message. 946 */ 947assert: |
965 test FLAGS,RESELECTED jz return /* reselected? */ 966 test FLAGS,IDENTIFY_SEEN jnz return /* seen IDENTIFY? */ | 948 test SEQ_FLAGS,RESELECTED jz return; /* reselected? */ 949 test SEQ_FLAGS,IDENTIFY_SEEN jnz return; /* seen IDENTIFY? */ |
967 | 950 |
968 mvi INTSTAT,NO_IDENT ret /* no - tell the kernel */ | 951 mvi INTSTAT,NO_IDENT ret; /* no - tell the kernel */ |
969 970/* 971 * Locate a disconnected SCB either by SAVED_TCL (ARG_1 is SCB_LIST_NULL) 972 * or by the SCBIDn ARG_1. The search begins at the SCB index passed in 973 * via SINDEX. If the SCB cannot be found, SINDEX will be SCB_LIST_NULL, 974 * otherwise, SCBPTR is set to the proper SCB. 975 */ 976findSCB: | 952 953/* 954 * Locate a disconnected SCB either by SAVED_TCL (ARG_1 is SCB_LIST_NULL) 955 * or by the SCBIDn ARG_1. The search begins at the SCB index passed in 956 * via SINDEX. If the SCB cannot be found, SINDEX will be SCB_LIST_NULL, 957 * otherwise, SCBPTR is set to the proper SCB. 958 */ 959findSCB: |
977 mov SCBPTR,SINDEX /* switch to next SCB */ 978 mov A, ARG_1 /* Tag passed in ARG_1 */ 979 cmp SCB_TAG,A jne findSCB_loop 980 test SCB_CONTROL,DISCONNECTED jnz foundSCB /*should be disconnected*/ | 960 mov SCBPTR,SINDEX; /* switch to next SCB */ 961 mov A, ARG_1; /* Tag passed in ARG_1 */ 962 cmp SCB_TAG,A jne findSCB_loop; 963 test SCB_CONTROL,DISCONNECTED jnz foundSCB;/*should be disconnected*/ |
981findSCB_loop: | 964findSCB_loop: |
982 inc SINDEX 983 mov A,SCBCOUNT 984 cmp SINDEX,A jne findSCB | 965 inc SINDEX; 966 mov A,SCBCOUNT; 967 cmp SINDEX,A jne findSCB; |
985/* 986 * We didn't find it. If we're paging, pull an SCB and DMA down the 987 * one we want. If we aren't paging or the SCB we dma down has the 988 * abort flag set, return not found. 989 */ | 968/* 969 * We didn't find it. If we're paging, pull an SCB and DMA down the 970 * one we want. If we aren't paging or the SCB we dma down has the 971 * abort flag set, return not found. 972 */ |
990 test FLAGS, PAGESCBS jz find_error 991 mov ALLZEROS call get_free_or_disc_scb 992 mvi DMAPARAMS, 0xd /* HDMAEN|DIRECTION|FIFORESET */ 993 mov ARG_1 call dma_scb 994 test SCB_CONTROL, ABORT_SCB jz return | 973.if ( SCB_PAGING ) 974 mov ALLZEROS call get_free_or_disc_scb; 975 mvi DMAPARAMS, HDMAEN|DIRECTION|FIFORESET; 976 mov ARG_1 call dma_scb; 977 test SCB_CONTROL, ABORT_SCB jz return; 978.endif |
995find_error: | 979find_error: |
996 mvi SINDEX, SCB_LIST_NULL ret | 980 mvi SINDEX, SCB_LIST_NULL ret; |
997foundSCB: | 981foundSCB: |
998 test SCB_CONTROL, ABORT_SCB jnz find_error 999 test FLAGS,PAGESCBS jz return | 982 test SCB_CONTROL, ABORT_SCB jnz find_error; 983.if ( SCB_PAGING ) |
1000rem_scb_from_disc_list: 1001/* Remove this SCB from the disconnection list */ | 984rem_scb_from_disc_list: 985/* Remove this SCB from the disconnection list */ |
1002 cmp SCB_NEXT,SCB_LIST_NULL je unlink_prev 1003 mov SAVED_LINKPTR, SCB_PREV 1004 mov SCBPTR, SCB_NEXT 1005 mov SCB_PREV, SAVED_LINKPTR 1006 mov SCBPTR, SINDEX | 986 cmp SCB_NEXT,SCB_LIST_NULL je unlink_prev; 987 mov SAVED_LINKPTR, SCB_PREV; 988 mov SCBPTR, SCB_NEXT; 989 mov SCB_PREV, SAVED_LINKPTR; 990 mov SCBPTR, SINDEX; |
1007unlink_prev: | 991unlink_prev: |
1008 cmp SCB_PREV,SCB_LIST_NULL je rHead/* At the head of the list */ 1009 mov SAVED_LINKPTR, SCB_NEXT 1010 mov SCBPTR, SCB_PREV 1011 mov SCB_NEXT, SAVED_LINKPTR 1012 mov SCBPTR, SINDEX ret | 992 cmp SCB_PREV,SCB_LIST_NULL je rHead;/* At the head of the list */ 993 mov SAVED_LINKPTR, SCB_NEXT; 994 mov SCBPTR, SCB_PREV; 995 mov SCB_NEXT, SAVED_LINKPTR; 996 mov SCBPTR, SINDEX ret; |
1013rHead: | 997rHead: |
1014 mov DISCONNECTED_SCBH,SCB_NEXT ret | 998 mov DISCONNECTED_SCBH,SCB_NEXT ret; 999.else 1000 ret; 1001.endif |
1015 1016set_stcnt_from_hcnt: | 1002 1003set_stcnt_from_hcnt: |
1017 mov STCNT0, HCNT0 1018 mov STCNT1, HCNT1 1019 mov STCNT2, HCNT2 ret | 1004 mov STCNT[0], HCNT[0]; 1005 mov STCNT[1], HCNT[1]; 1006 mov STCNT[2], HCNT[2] ret; |
1020 1021bcopy_7: | 1007 1008bcopy_7: |
1022 mov DINDIR, SINDIR 1023 mov DINDIR, SINDIR | 1009 mov DINDIR, SINDIR; 1010 mov DINDIR, SINDIR; |
1024bcopy_5: | 1011bcopy_5: |
1025 mov DINDIR, SINDIR | 1012 mov DINDIR, SINDIR; |
1026bcopy_4: | 1013bcopy_4: |
1027 mov DINDIR, SINDIR | 1014 mov DINDIR, SINDIR; |
1028bcopy_3: | 1015bcopy_3: |
1029 mov DINDIR, SINDIR 1030 mov DINDIR, SINDIR 1031 mov DINDIR, SINDIR ret | 1016 mov DINDIR, SINDIR; 1017 mov DINDIR, SINDIR; 1018 mov DINDIR, SINDIR ret; |
1032 1033dma_scb: 1034 /* 1035 * SCB index is in SINDEX. Determine the physical address in 1036 * the host where this SCB is located and load HADDR with it. 1037 */ | 1019 1020dma_scb: 1021 /* 1022 * SCB index is in SINDEX. Determine the physical address in 1023 * the host where this SCB is located and load HADDR with it. 1024 */ |
1038 shr DINDEX, SINDEX, 3 1039 shl A, SINDEX, 5 1040 add HADDR0, A, HSCB_ADDR0 1041 mov A, DINDEX 1042 adc HADDR1, A, HSCB_ADDR1 1043 clr A 1044 adc HADDR2, A, HSCB_ADDR2 1045 adc HADDR3, A, HSCB_ADDR3 | 1025 shr DINDEX, 3, SINDEX; 1026 shl A, 5, SINDEX; 1027 add HADDR[0], A, HSCB_ADDR[0]; 1028 mov A, DINDEX; 1029 adc HADDR[1], A, HSCB_ADDR[1]; 1030 clr A; 1031 adc HADDR[2], A, HSCB_ADDR[2]; 1032 adc HADDR[3], A, HSCB_ADDR[3]; |
1046 /* Setup Count */ | 1033 /* Setup Count */ |
1047 mvi HCNT0, 28 1048 clr HCNT1 1049 clr HCNT2 1050 mov DFCNTRL, DMAPARAMS 1051 test DMAPARAMS, DIRECTION jnz dma_scb_fromhost | 1034 mvi HCNT[0], 28; 1035 clr HCNT[1]; 1036 clr HCNT[2]; 1037 mov DFCNTRL, DMAPARAMS; 1038 test DMAPARAMS, DIRECTION jnz dma_scb_fromhost; |
1052 /* Fill it with the SCB data */ | 1039 /* Fill it with the SCB data */ |
1053 call copy_scb_tofifo 1054 mvi DFCNTRL, 0xa /* HDMAEN | FIFOFLUSH */ | 1040 call copy_scb_tofifo; 1041 or DFCNTRL, HDMAEN|FIFOFLUSH; |
1055dma_scb_fromhost: | 1042dma_scb_fromhost: |
1056 call dma_finish | 1043 call dma_finish; |
1057 /* If we were putting the SCB, we are done */ | 1044 /* If we were putting the SCB, we are done */ |
1058 test DMAPARAMS, DIRECTION jz return 1059 mvi SCBARRAY call dfdat_in_7 1060 call dfdat_in_7_continued 1061 call dfdat_in_7_continued 1062 jmp dfdat_in_7_continued | 1045 test DMAPARAMS, DIRECTION jz return; 1046 mvi SCB_CONTROL call dfdat_in_7; 1047 call dfdat_in_7_continued; 1048 call dfdat_in_7_continued; 1049 jmp dfdat_in_7_continued; |
1063dfdat_in_7: | 1050dfdat_in_7: |
1064 mov DINDEX,SINDEX | 1051 mov DINDEX,SINDEX; |
1065dfdat_in_7_continued: | 1052dfdat_in_7_continued: |
1066 mov DINDIR,DFDAT 1067 mov DINDIR,DFDAT 1068 mov DINDIR,DFDAT 1069 mov DINDIR,DFDAT 1070 mov DINDIR,DFDAT 1071 mov DINDIR,DFDAT 1072 mov DINDIR,DFDAT ret | 1053 mov DINDIR,DFDAT; 1054 mov DINDIR,DFDAT; 1055 mov DINDIR,DFDAT; 1056 mov DINDIR,DFDAT; 1057 mov DINDIR,DFDAT; 1058 mov DINDIR,DFDAT; 1059 mov DINDIR,DFDAT ret; |
1073 1074copy_scb_tofifo: | 1060 1061copy_scb_tofifo: |
1075 mvi SCBARRAY call dfdat_out_7 1076 call dfdat_out_7 1077 call dfdat_out_7 | 1062 mvi SCB_CONTROL call dfdat_out_7; 1063 call dfdat_out_7; 1064 call dfdat_out_7; |
1078dfdat_out_7: | 1065dfdat_out_7: |
1079 mov DFDAT,SINDIR 1080 mov DFDAT,SINDIR 1081 mov DFDAT,SINDIR 1082 mov DFDAT,SINDIR 1083 mov DFDAT,SINDIR 1084 mov DFDAT,SINDIR 1085 mov DFDAT,SINDIR ret | 1066 mov DFDAT,SINDIR; 1067 mov DFDAT,SINDIR; 1068 mov DFDAT,SINDIR; 1069 mov DFDAT,SINDIR; 1070 mov DFDAT,SINDIR; 1071 mov DFDAT,SINDIR; 1072 mov DFDAT,SINDIR ret; |
1086 1087/* 1088 * Wait for DMA from host memory to data FIFO to complete, then disable 1089 * DMA and wait for it to acknowledge that it's off. 1090 */ 1091dma_finish: | 1073 1074/* 1075 * Wait for DMA from host memory to data FIFO to complete, then disable 1076 * DMA and wait for it to acknowledge that it's off. 1077 */ 1078dma_finish: |
1092 test DFSTATUS,HDONE jz dma_finish | 1079 test DFSTATUS,HDONE jz dma_finish; |
1093 /* Turn off DMA */ | 1080 /* Turn off DMA */ |
1094 and DFCNTRL, 0xf7 ret # ~HDMAEN | 1081 and DFCNTRL, ~HDMAEN; 1082 test DFCNTRL, HDMAEN jnz .; 1083 ret; |
1095 1096index_untagged_scb: | 1084 1085index_untagged_scb: |
1097 mov DINDEX, SINDEX 1098 shr DINDEX, 4 1099 and DINDEX, 0x03 /* Bottom two bits of tid */ 1100 add DINDEX, SCB_ACTIVE0 1101 shr A, SINDEX, 6 /* Target ID divided by 4 */ 1102 test SINDEX, SELBUSB jz index_untagged_scb2 1103 add A, 2 /* Add 2 positions */ | 1086 mov DINDEX, SINDEX; 1087 shr DINDEX, 4; 1088 and DINDEX, 0x03; /* Bottom two bits of tid */ 1089 add DINDEX, SCB_BUSYTARGETS; 1090 shr A, 6, SINDEX; /* Target ID divided by 4 */ 1091 test SINDEX, SELBUSB jz index_untagged_scb2; 1092 add A, 2; /* Add 2 positions */ |
1104index_untagged_scb2: | 1093index_untagged_scb2: |
1105 mov SCBPTR, A /* | 1094 mov SCBPTR, A; /* |
1106 * Select the SCB with this 1107 * target's information. 1108 */ | 1095 * Select the SCB with this 1096 * target's information. 1097 */ |
1109 mov SINDEX, DINDEX ret | 1098 mov SINDEX, DINDEX ret; |
1110 | 1099 |
1100add_scb_to_free_list: 1101 mov SCB_NEXT, FREE_SCBH; 1102 mvi SCB_TAG, SCB_LIST_NULL; 1103 mov FREE_SCBH, SCBPTR ret; |
|
1111 | 1104 |
1105.if ( SCB_PAGING ) |
|
1112get_free_or_disc_scb: | 1106get_free_or_disc_scb: |
1113 cmp FREE_SCBH, SCB_LIST_NULL jne dequeue_free_scb 1114 cmp DISCONNECTED_SCBH, SCB_LIST_NULL jne dequeue_disc_scb | 1107 cmp FREE_SCBH, SCB_LIST_NULL jne dequeue_free_scb; 1108 cmp DISCONNECTED_SCBH, SCB_LIST_NULL jne dequeue_disc_scb; |
1115return_error: | 1109return_error: |
1116 mvi SINDEX, SCB_LIST_NULL ret | 1110 mvi SINDEX, SCB_LIST_NULL ret; |
1117dequeue_disc_scb: | 1111dequeue_disc_scb: |
1118 mov SCBPTR, DISCONNECTED_SCBH | 1112 mov SCBPTR, DISCONNECTED_SCBH; |
1119/* 1120 * If we have a residual, then we are in the middle of some I/O 1121 * and we have to send this SCB back up to the kernel so that the 1122 * saved data pointers and residual information isn't lost. 1123 */ | 1113/* 1114 * If we have a residual, then we are in the middle of some I/O 1115 * and we have to send this SCB back up to the kernel so that the 1116 * saved data pointers and residual information isn't lost. 1117 */ |
1124 test SCB_RESID_SGCNT,0xff jz unlink_disc_scb 1125 mvi DMAPARAMS, 0x9 /* HDMAEN | FIFORESET*/ 1126 mov SCB_TAG call dma_scb | 1118 test SCB_RESID_SGCNT,0xff jnz dma_up_scb; 1119 cmp SCB_LINKED_NEXT, SCB_LIST_NULL je unlink_disc_scb; 1120dma_up_scb: 1121 mvi DMAPARAMS, FIFORESET; 1122 mov SCB_TAG call dma_scb; |
1127unlink_disc_scb: 1128 /* jmp instead of call since we want to return anyway */ | 1123unlink_disc_scb: 1124 /* jmp instead of call since we want to return anyway */ |
1129 mov SCBPTR jmp rem_scb_from_disc_list | 1125 mov SCBPTR jmp rem_scb_from_disc_list; |
1130dequeue_free_scb: | 1126dequeue_free_scb: |
1131 mov SCBPTR, FREE_SCBH 1132 mov FREE_SCBH, SCB_NEXT ret | 1127 mov SCBPTR, FREE_SCBH; 1128 mov FREE_SCBH, SCB_NEXT ret; |
1133 | 1129 |
1134add_scb_to_free_list: 1135 mov SCB_NEXT, FREE_SCBH 1136 mvi SCB_TAG, SCB_LIST_NULL 1137 mov FREE_SCBH, SCBPTR ret 1138 | |
1139add_scb_to_disc_list: 1140/* 1141 * Link this SCB into the DISCONNECTED list. This list holds the 1142 * candidates for paging out an SCB if one is needed for a new command. 1143 * Modifying the disconnected list is a critical(pause dissabled) section. 1144 */ | 1130add_scb_to_disc_list: 1131/* 1132 * Link this SCB into the DISCONNECTED list. This list holds the 1133 * candidates for paging out an SCB if one is needed for a new command. 1134 * Modifying the disconnected list is a critical(pause dissabled) section. 1135 */ |
1145 mvi SCB_PREV, SCB_LIST_NULL 1146 mov SCB_NEXT, DISCONNECTED_SCBH 1147 mov DISCONNECTED_SCBH, SCBPTR 1148 cmp SCB_NEXT,SCB_LIST_NULL je return 1149 mov SCBPTR,SCB_NEXT 1150 mov SCB_PREV,DISCONNECTED_SCBH 1151 mov SCBPTR,DISCONNECTED_SCBH ret 1152 | 1136 mvi SCB_PREV, SCB_LIST_NULL; 1137 mov SCB_NEXT, DISCONNECTED_SCBH; 1138 mov DISCONNECTED_SCBH, SCBPTR; 1139 cmp SCB_NEXT,SCB_LIST_NULL je return; 1140 mov SCBPTR,SCB_NEXT; 1141 mov SCB_PREV,DISCONNECTED_SCBH; 1142 mov SCBPTR,DISCONNECTED_SCBH ret; 1143.endif |