1 /* NCR53C9x.c: Generic SCSI driver code for NCR53C9x chips.
3 * Originally esp.c : EnhancedScsiProcessor Sun SCSI driver code.
5 * Copyright (C) 1995, 1998 David S. Miller (davem@caip.rutgers.edu)
7 * Most DMA dependencies put in driver specific files by
8 * Jesper Skov (jskov@cygnus.co.uk)
10 * Set up to use esp_read/esp_write (preprocessor macros in NCR53c9x.h) by
11 * Tymm Twillman (tymm@coe.missouri.edu)
16 * 1) Maybe disable parity checking in config register one for SCSI1
17 * targets. (Gilmore says parity error on the SBus can lock up
19 * 2) Add support for DMA2 pipelining.
20 * 3) Add tagged queueing.
21 * 4) Maybe change use of "esp" to something more "NCR"'ish.
25 #include <linux/module.h>
28 #include <linux/config.h>
29 #include <linux/kernel.h>
30 #include <linux/delay.h>
31 #include <linux/types.h>
32 #include <linux/string.h>
33 #include <linux/malloc.h>
34 #include <linux/blk.h>
35 #include <linux/proc_fs.h>
36 #include <linux/stat.h>
37 #include <linux/init.h>
43 #include <asm/system.h>
44 #include <asm/ptrace.h>
45 #include <asm/pgtable.h>
49 /* Command phase enumeration. */
51 not_issued
= 0x00, /* Still in the issue_SC queue. */
53 /* Various forms of selecting a target. */
54 #define in_slct_mask 0x10
55 in_slct_norm
= 0x10, /* ESP is arbitrating, normal selection */
56 in_slct_stop
= 0x11, /* ESP will select, then stop with IRQ */
57 in_slct_msg
= 0x12, /* select, then send a message */
58 in_slct_tag
= 0x13, /* select and send tagged queue msg */
59 in_slct_sneg
= 0x14, /* select and acquire sync capabilities */
61 /* Any post selection activity. */
62 #define in_phases_mask 0x20
63 in_datain
= 0x20, /* Data is transferring from the bus */
64 in_dataout
= 0x21, /* Data is transferring to the bus */
65 in_data_done
= 0x22, /* Last DMA data operation done (maybe) */
66 in_msgin
= 0x23, /* Eating message from target */
67 in_msgincont
= 0x24, /* Eating more msg bytes from target */
68 in_msgindone
= 0x25, /* Decide what to do with what we got */
69 in_msgout
= 0x26, /* Sending message to target */
70 in_msgoutdone
= 0x27, /* Done sending msg out */
71 in_cmdbegin
= 0x28, /* Sending cmd after abnormal selection */
72 in_cmdend
= 0x29, /* Done sending slow cmd */
73 in_status
= 0x2a, /* Was in status phase, finishing cmd */
74 in_freeing
= 0x2b, /* freeing the bus for cmd cmplt or disc */
75 in_the_dark
= 0x2c, /* Don't know what bus phase we are in */
77 /* Special states, ie. not normal bus transitions... */
78 #define in_spec_mask 0x80
79 in_abortone
= 0x80, /* Aborting one command currently */
80 in_abortall
= 0x81, /* Blowing away all commands we have */
81 in_resetdev
= 0x82, /* SCSI target reset in progress */
82 in_resetbus
= 0x83, /* SCSI bus reset in progress */
83 in_tgterror
= 0x84, /* Target did something stupid */
87 /* Zero has special meaning, see skipahead[12]. */
90 /*1*/ do_phase_determine
,
92 /*3*/ do_reset_complete
,
97 struct proc_dir_entry proc_scsi_esp
= {
98 PROC_SCSI_ESP
, 3, "esp",
99 S_IFDIR
| S_IRUGO
| S_IXUGO
, 2
102 /* The master ring of all esp hosts we are managing in this driver. */
103 struct NCR_ESP
*espchain
= 0;
104 int nesps
= 0, esps_in_use
= 0, esps_running
= 0;
106 void esp_intr(int irq
, void *dev_id
, struct pt_regs
*pregs
);
108 /* Debugging routines */
109 struct esp_cmdstrings
{
112 } esp_cmd_strings
[] = {
114 { ESP_CMD_NULL
, "ESP_NOP", },
115 { ESP_CMD_FLUSH
, "FIFO_FLUSH", },
116 { ESP_CMD_RC
, "RSTESP", },
117 { ESP_CMD_RS
, "RSTSCSI", },
118 /* Disconnected State Group */
119 { ESP_CMD_RSEL
, "RESLCTSEQ", },
120 { ESP_CMD_SEL
, "SLCTNATN", },
121 { ESP_CMD_SELA
, "SLCTATN", },
122 { ESP_CMD_SELAS
, "SLCTATNSTOP", },
123 { ESP_CMD_ESEL
, "ENSLCTRESEL", },
124 { ESP_CMD_DSEL
, "DISSELRESEL", },
125 { ESP_CMD_SA3
, "SLCTATN3", },
126 { ESP_CMD_RSEL3
, "RESLCTSEQ", },
127 /* Target State Group */
128 { ESP_CMD_SMSG
, "SNDMSG", },
129 { ESP_CMD_SSTAT
, "SNDSTATUS", },
130 { ESP_CMD_SDATA
, "SNDDATA", },
131 { ESP_CMD_DSEQ
, "DISCSEQ", },
132 { ESP_CMD_TSEQ
, "TERMSEQ", },
133 { ESP_CMD_TCCSEQ
, "TRGTCMDCOMPSEQ", },
134 { ESP_CMD_DCNCT
, "DISC", },
135 { ESP_CMD_RMSG
, "RCVMSG", },
136 { ESP_CMD_RCMD
, "RCVCMD", },
137 { ESP_CMD_RDATA
, "RCVDATA", },
138 { ESP_CMD_RCSEQ
, "RCVCMDSEQ", },
139 /* Initiator State Group */
140 { ESP_CMD_TI
, "TRANSINFO", },
141 { ESP_CMD_ICCSEQ
, "INICMDSEQCOMP", },
142 { ESP_CMD_MOK
, "MSGACCEPTED", },
143 { ESP_CMD_TPAD
, "TPAD", },
144 { ESP_CMD_SATN
, "SATN", },
145 { ESP_CMD_RATN
, "RATN", },
147 #define NUM_ESP_COMMANDS ((sizeof(esp_cmd_strings)) / (sizeof(struct esp_cmdstrings)))
149 /* Print textual representation of an ESP command */
150 static inline void esp_print_cmd(unchar espcmd
)
152 unchar dma_bit
= espcmd
& ESP_CMD_DMA
;
156 for(i
=0; i
<NUM_ESP_COMMANDS
; i
++)
157 if(esp_cmd_strings
[i
].cmdchar
== espcmd
)
159 if(i
==NUM_ESP_COMMANDS
)
160 printk("ESP_Unknown");
162 printk("%s%s", esp_cmd_strings
[i
].text
,
163 ((dma_bit
) ? "+DMA" : ""));
166 /* Print the status register's value */
167 static inline void esp_print_statreg(unchar statreg
)
172 phase
= statreg
& ESP_STAT_PMASK
;
173 printk("%s,", (phase
== ESP_DOP
? "DATA-OUT" :
174 (phase
== ESP_DIP
? "DATA-IN" :
175 (phase
== ESP_CMDP
? "COMMAND" :
176 (phase
== ESP_STATP
? "STATUS" :
177 (phase
== ESP_MOP
? "MSG-OUT" :
178 (phase
== ESP_MIP
? "MSG_IN" :
180 if(statreg
& ESP_STAT_TDONE
)
181 printk("TRANS_DONE,");
182 if(statreg
& ESP_STAT_TCNT
)
183 printk("TCOUNT_ZERO,");
184 if(statreg
& ESP_STAT_PERR
)
186 if(statreg
& ESP_STAT_SPAM
)
188 if(statreg
& ESP_STAT_INTR
)
193 /* Print the interrupt register's value */
194 static inline void esp_print_ireg(unchar intreg
)
197 if(intreg
& ESP_INTR_S
)
198 printk("SLCT_NATN ");
199 if(intreg
& ESP_INTR_SATN
)
201 if(intreg
& ESP_INTR_RSEL
)
203 if(intreg
& ESP_INTR_FDONE
)
205 if(intreg
& ESP_INTR_BSERV
)
207 if(intreg
& ESP_INTR_DC
)
209 if(intreg
& ESP_INTR_IC
)
211 if(intreg
& ESP_INTR_SR
)
212 printk("SCSI_BUS_RESET ");
216 /* Print the sequence step registers contents */
217 static inline void esp_print_seqreg(unchar stepreg
)
219 stepreg
&= ESP_STEP_VBITS
;
221 (stepreg
== ESP_STEP_ASEL
? "SLCT_ARB_CMPLT" :
222 (stepreg
== ESP_STEP_SID
? "1BYTE_MSG_SENT" :
223 (stepreg
== ESP_STEP_NCMD
? "NOT_IN_CMD_PHASE" :
224 (stepreg
== ESP_STEP_PPC
? "CMD_BYTES_LOST" :
225 (stepreg
== ESP_STEP_FINI4
? "CMD_SENT_OK" :
229 static char *phase_string(int phase
)
285 #ifdef DEBUG_STATE_MACHINE
286 static inline void esp_advance_phase(Scsi_Cmnd
*s
, int newphase
)
288 ESPLOG(("<%s>", phase_string(newphase
)));
289 s
->SCp
.sent_command
= s
->SCp
.phase
;
290 s
->SCp
.phase
= newphase
;
293 #define esp_advance_phase(__s, __newphase) \
294 (__s)->SCp.sent_command = (__s)->SCp.phase; \
295 (__s)->SCp.phase = (__newphase);
298 #ifdef DEBUG_ESP_CMDS
299 extern inline void esp_cmd(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
,
302 esp
->espcmdlog
[esp
->espcmdent
] = cmd
;
303 esp
->espcmdent
= (esp
->espcmdent
+ 1) & 31;
304 esp_write(eregs
->esp_cmnd
, cmd
);
307 #define esp_cmd(__esp, __eregs, __cmd) esp_write((__eregs)->esp_cmnd, (__cmd))
310 /* How we use the various Linux SCSI data structures for operation.
314 * We keep track of the syncronous capabilities of a target
315 * in the device member, using sync_min_period and
316 * sync_max_offset. These are the values we directly write
317 * into the ESP registers while running a command. If offset
318 * is zero the ESP will use asynchronous transfers.
319 * If the borken flag is set we assume we shouldn't even bother
320 * trying to negotiate for synchronous transfer as this target
321 * is really stupid. If we notice the target is dropping the
322 * bus, and we have been allowing it to disconnect, we clear
323 * the disconnect flag.
326 /* Manipulation of the ESP command queues. Thanks to the aha152x driver
327 * and its author, Juergen E. Fischer, for the methods used here.
328 * Note that these are per-ESP queues, not global queues like
329 * the aha152x driver uses.
331 static inline void append_SC(Scsi_Cmnd
**SC
, Scsi_Cmnd
*new_SC
)
335 new_SC
->host_scribble
= (unsigned char *) NULL
;
339 for(end
=*SC
;end
->host_scribble
;end
=(Scsi_Cmnd
*)end
->host_scribble
)
341 end
->host_scribble
= (unsigned char *) new_SC
;
345 static inline void prepend_SC(Scsi_Cmnd
**SC
, Scsi_Cmnd
*new_SC
)
347 new_SC
->host_scribble
= (unsigned char *) *SC
;
351 static inline Scsi_Cmnd
*remove_first_SC(Scsi_Cmnd
**SC
)
357 *SC
= (Scsi_Cmnd
*) (*SC
)->host_scribble
;
361 static inline Scsi_Cmnd
*remove_SC(Scsi_Cmnd
**SC
, int target
, int lun
)
363 Scsi_Cmnd
*ptr
, *prev
;
365 for(ptr
= *SC
, prev
= NULL
;
366 ptr
&& ((ptr
->target
!= target
) || (ptr
->lun
!= lun
));
367 prev
= ptr
, ptr
= (Scsi_Cmnd
*) ptr
->host_scribble
)
371 prev
->host_scribble
=ptr
->host_scribble
;
373 *SC
=(Scsi_Cmnd
*)ptr
->host_scribble
;
378 /* Resetting various pieces of the ESP scsi driver chipset */
380 /* Reset the ESP chip, _not_ the SCSI bus. */
381 static void esp_reset_esp(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
383 int family_code
, version
, i
;
386 /* Now reset the ESP chip */
387 esp_cmd(esp
, eregs
, ESP_CMD_RC
);
388 esp_cmd(esp
, eregs
, ESP_CMD_NULL
| ESP_CMD_DMA
);
389 if(esp
->erev
== fast
)
390 esp_write(eregs
->esp_cfg2
, ESP_CONFIG2_FENAB
);
391 esp_cmd(esp
, eregs
, ESP_CMD_NULL
| ESP_CMD_DMA
);
393 /* This is the only point at which it is reliable to read
394 * the ID-code for a fast ESP chip variant.
396 esp
->max_period
= ((35 * esp
->ccycle
) / 1000);
397 if(esp
->erev
== fast
) {
398 char *erev2string
[] = {
404 "Symbios Logic 53CF9x-2",
408 version
= esp_read(eregs
->esp_uid
);
409 family_code
= (version
& 0xf8) >> 3;
410 if(family_code
== 0x02) {
411 if ((version
& 7) == 2)
415 } else if(family_code
== 0x0a)
416 esp
->erev
= fas366
; /* Version is usually '5'. */
417 else if(family_code
== 0x00) {
418 if ((version
& 7) == 2)
419 esp
->erev
= fas100a
; /* NCR53C9X */
421 esp
->erev
= espunknown
;
422 } else if(family_code
== 0x14) {
423 if ((version
& 7) == 2)
426 esp
->erev
= espunknown
;
427 } else if(family_code
== 0x00) {
428 if ((version
& 7) == 2)
429 esp
->erev
= fas100a
; /* NCR53C9X */
431 esp
->erev
= espunknown
;
433 esp
->erev
= espunknown
;
434 ESPLOG(("esp%d: FAST chip is %s (family=%d, version=%d)\n",
435 esp
->esp_id
, erev2string
[esp
->erev
- fas236
],
436 family_code
, (version
& 7)));
438 esp
->min_period
= ((4 * esp
->ccycle
) / 1000);
440 esp
->min_period
= ((5 * esp
->ccycle
) / 1000);
443 /* Reload the configuration registers */
444 esp_write(eregs
->esp_cfact
, esp
->cfact
);
446 esp_write(eregs
->esp_stp
, 0);
448 esp_write(eregs
->esp_soff
, 0);
449 esp_write(eregs
->esp_timeo
, esp
->neg_defp
);
450 esp
->max_period
= (esp
->max_period
+ 3)>>2;
451 esp
->min_period
= (esp
->min_period
+ 3)>>2;
453 esp_write(eregs
->esp_cfg1
, esp
->config1
);
459 esp_write(eregs
->esp_cfg2
, esp
->config2
);
463 esp_write(eregs
->esp_cfg2
, esp
->config2
);
464 esp
->prev_cfg3
= esp
->config3
[0];
465 esp_write(eregs
->esp_cfg3
, esp
->prev_cfg3
);
468 panic("esp: FAS366 support not present, please notify "
469 "jongk@cs.utwente.nl");
474 /* Fast ESP variants */
475 esp_write(eregs
->esp_cfg2
, esp
->config2
);
477 esp
->config3
[i
] |= ESP_CONFIG3_FCLK
;
478 esp
->prev_cfg3
= esp
->config3
[0];
479 esp_write(eregs
->esp_cfg3
, esp
->prev_cfg3
);
484 /* Different timeout constant for these chips */
486 FSC_NEG_DEFP(esp
->cfreq
,
487 (esp
->cfact
== ESP_CCF_F0
?
488 ESP_CCF_F7
+ 1 : esp
->cfact
));
489 esp_write(eregs
->esp_timeo
, esp
->neg_defp
);
490 /* Enable Active Negotiation if possible */
491 if((esp
->erev
== fsc
) && !esp
->diff
)
492 esp_write(eregs
->esp_cfg4
, ESP_CONFIG4_EAN
);
496 esp_write(eregs
->esp_cfg2
, esp
->config2
);
498 esp
->config3
[i
] |= ESP_CONFIG3_FCLOCK
;
499 esp
->prev_cfg3
= esp
->config3
[0];
500 esp_write(eregs
->esp_cfg3
, esp
->prev_cfg3
);
504 panic("esp: what could it be... I wonder...");
508 /* Eat any bitrot in the chip */
509 trash
= esp_read(eregs
->esp_intrpt
);
513 /* This places the ESP into a known state at boot time. */
514 void esp_bootup_reset(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
516 volatile unchar trash
;
523 esp_reset_esp(esp
, eregs
);
525 /* Reset the SCSI bus, but tell ESP not to generate an irq */
526 esp_write(eregs
->esp_cfg1
, (esp_read(eregs
->esp_cfg1
) | ESP_CONFIG1_SRRDISAB
));
527 esp_cmd(esp
, eregs
, ESP_CMD_RS
);
529 esp_write(eregs
->esp_cfg1
, esp
->config1
);
531 /* Eat any bitrot in the chip and we are done... */
532 trash
= esp_read(eregs
->esp_intrpt
);
535 /* Allocate structure and insert basic data such as SCSI chip frequency
536 * data and a pointer to the device
538 struct NCR_ESP
* esp_allocate(Scsi_Host_Template
*tpnt
, void *esp_dev
)
540 struct NCR_ESP
*esp
, *elink
;
541 struct Scsi_Host
*esp_host
;
543 esp_host
= scsi_register(tpnt
, sizeof(struct NCR_ESP
));
545 panic("Cannot register ESP SCSI host");
546 esp
= (struct NCR_ESP
*) esp_host
->hostdata
;
548 panic("No esp in hostdata");
549 esp
->ehost
= esp_host
;
551 esp
->esp_id
= nesps
++;
553 /* Set bitshift value (only used on Amiga with multiple ESPs) */
556 /* Put into the chain of esp chips detected */
559 while(elink
->next
) elink
= elink
->next
;
569 void esp_deallocate(struct NCR_ESP
*esp
)
571 struct NCR_ESP
*elink
;
573 if(espchain
== esp
) {
576 for(elink
= espchain
; elink
&& (elink
->next
!= esp
); elink
= elink
->next
);
578 elink
->next
= esp
->next
;
583 /* Complete initialization of ESP structure and device
584 * Caller must have initialized appropriate parts of the ESP structure
585 * between the call to esp_allocate and this function.
587 void esp_initialize(struct NCR_ESP
*esp
)
589 struct ESP_regs
*eregs
= esp
->eregs
;
594 /* Check out the clock properties of the chip. */
596 /* This is getting messy but it has to be done
597 * correctly or else you get weird behavior all
598 * over the place. We are trying to basically
599 * figure out three pieces of information.
601 * a) Clock Conversion Factor
603 * This is a representation of the input
604 * crystal clock frequency going into the
605 * ESP on this machine. Any operation whose
606 * timing is longer than 400ns depends on this
607 * value being correct. For example, you'll
608 * get blips for arbitration/selection during
609 * high load or with multiple targets if this
610 * is not set correctly.
612 * b) Selection Time-Out
614 * The ESP isn't very bright and will arbitrate
615 * for the bus and try to select a target
616 * forever if you let it. This value tells
617 * the ESP when it has taken too long to
618 * negotiate and that it should interrupt
619 * the CPU so we can see what happened.
620 * The value is computed as follows (from
621 * NCR/Symbios chip docs).
623 * (Time Out Period) * (Input Clock)
624 * STO = ----------------------------------
625 * (8192) * (Clock Conversion Factor)
627 * You usually want the time out period to be
628 * around 250ms, I think we'll set it a little
629 * bit higher to account for fully loaded SCSI
630 * bus's and slow devices that don't respond so
631 * quickly to selection attempts. (yeah, I know
632 * this is out of spec. but there is a lot of
633 * buggy pieces of firmware out there so bite me)
635 * c) Imperical constants for synchronous offset
636 * and transfer period register values
638 * This entails the smallest and largest sync
639 * period we could ever handle on this ESP.
644 if(fmhz
<= (5000000))
647 ccf
= (((5000000 - 1) + (fmhz
))/(5000000));
648 if(!ccf
|| ccf
> 8) {
649 /* If we can't find anything reasonable,
650 * just assume 20MHZ. This is the clock
651 * frequency of the older sun4c's where I've
652 * been unable to find the clock-frequency
653 * PROM property. All other machines provide
654 * useful values it seems.
659 if(ccf
==(ESP_CCF_F7
+1))
660 esp
->cfact
= ESP_CCF_F0
;
661 else if(ccf
== ESP_CCF_NEVER
)
662 esp
->cfact
= ESP_CCF_F2
;
666 esp
->ccycle
= ESP_MHZ_TO_CYCLE(fmhz
);
667 esp
->ctick
= ESP_TICK(ccf
, esp
->ccycle
);
668 esp
->neg_defp
= ESP_NEG_DEFP(fmhz
, ccf
);
669 esp
->sync_defp
= SYNC_DEFP_SLOW
;
671 printk("SCSI ID %d Clk %dMHz CCF=%d TOut %d ",
672 esp
->scsi_id
, (esp
->cfreq
/ 1000000),
673 ccf
, (int) esp
->neg_defp
);
675 /* Fill in ehost data */
676 esp
->ehost
->base
= (unsigned char *) eregs
;
677 esp
->ehost
->this_id
= esp
->scsi_id
;
678 esp
->ehost
->irq
= esp
->irq
;
681 esp
->scsi_id_mask
= (1 << esp
->scsi_id
);
683 /* Probe the revision of this esp */
684 esp
->config1
= (ESP_CONFIG1_PENABLE
| (esp
->scsi_id
& 7));
685 esp
->config2
= (ESP_CONFIG2_SCSI2ENAB
| ESP_CONFIG2_REGPARITY
);
686 esp_write(eregs
->esp_cfg2
, esp
->config2
);
687 if((esp_read(eregs
->esp_cfg2
) & ~(ESP_CONFIG2_MAGIC
)) !=
688 (ESP_CONFIG2_SCSI2ENAB
| ESP_CONFIG2_REGPARITY
)) {
689 printk("NCR53C90(esp100)\n");
693 esp_write(eregs
->esp_cfg2
, 0);
694 esp_write(eregs
->esp_cfg3
, 5);
695 if(esp_read(eregs
->esp_cfg3
) != 5) {
696 printk("NCR53C90A(esp100a)\n");
701 for(target
=0; target
<8; target
++)
702 esp
->config3
[target
] = 0;
704 esp_write(eregs
->esp_cfg3
, 0);
705 if(ccf
> ESP_CCF_F5
) {
706 printk("NCR53C9XF(espfast)\n");
708 esp
->sync_defp
= SYNC_DEFP_FAST
;
710 printk("NCR53C9x(esp236)\n");
716 /* Initialize the command queues */
718 esp
->disconnected_SC
= 0;
721 /* Clear the state machines. */
722 esp
->targets_present
= 0;
723 esp
->resetting_bus
= 0;
725 esp
->fas_premature_intr_workaround
= 0;
726 for(i
= 0; i
< 32; i
++)
727 esp
->espcmdlog
[i
] = 0;
729 for(i
= 0; i
< 16; i
++) {
730 esp
->cur_msgout
[i
] = 0;
731 esp
->cur_msgin
[i
] = 0;
733 esp
->prevmsgout
= esp
->prevmsgin
= 0;
734 esp
->msgout_len
= esp
->msgin_len
= 0;
736 /* Clear the one behind caches to hold unmatchable values. */
737 esp
->prev_soff
= esp
->prev_stp
= esp
->prev_cfg3
= 0xff;
739 /* Reset the thing before we try anything... */
740 esp_bootup_reset(esp
, eregs
);
748 /* The info function will return whatever useful
749 * information the developer sees fit. If not provided, then
750 * the name field will be used instead.
752 const char *esp_info(struct Scsi_Host
*host
)
756 esp
= (struct NCR_ESP
*) host
->hostdata
;
759 return "ESP100 (NCR53C90)";
761 return "ESP100A (NCR53C90A)";
763 return "ESP236 (NCR53C9x)";
765 return "Emulex FAS216";
767 return "Emulex FAS236";
769 return "QLogic FAS366";
773 return "Symbios Logic 53CF9x-2";
775 panic("Bogon ESP revision");
779 /* From Wolfgang Stanglmeier's NCR scsi driver. */
788 static void copy_mem_info(struct info_str
*info
, char *data
, int len
)
790 if (info
->pos
+ len
> info
->length
)
791 len
= info
->length
- info
->pos
;
793 if (info
->pos
+ len
< info
->offset
) {
797 if (info
->pos
< info
->offset
) {
798 data
+= (info
->offset
- info
->pos
);
799 len
-= (info
->offset
- info
->pos
);
803 memcpy(info
->buffer
+ info
->pos
, data
, len
);
808 static int copy_info(struct info_str
*info
, char *fmt
, ...)
815 len
= vsprintf(buf
, fmt
, args
);
818 copy_mem_info(info
, buf
, len
);
822 static int esp_host_info(struct NCR_ESP
*esp
, char *ptr
, off_t offset
, int len
)
824 struct info_str info
;
829 info
.offset
= offset
;
832 copy_info(&info
, "ESP Host Adapter:\n");
833 copy_info(&info
, "\tESP Model\t\t");
836 copy_info(&info
, "ESP100 (NCR53C90)\n");
839 copy_info(&info
, "ESP100A (NCR53C90A)\n");
842 copy_info(&info
, "ESP236 (NCR53C9x)\n");
845 copy_info(&info
, "Emulex FAS216\n");
848 copy_info(&info
, "Emulex FAS236\n");
851 copy_info(&info
, "FPESP100A\n");
854 copy_info(&info
, "Generic FAST\n");
857 copy_info(&info
, "QLogic FAS366\n");
860 copy_info(&info
, "Symbios Logic 53C9x-2\n");
864 copy_info(&info
, "Unknown!\n");
867 copy_info(&info
, "\tLive Targets\t\t[ ");
868 for(i
= 0; i
< 15; i
++) {
869 if(esp
->targets_present
& (1 << i
))
870 copy_info(&info
, "%d ", i
);
872 copy_info(&info
, "]\n\n");
874 /* Now describe the state of each existing target. */
875 copy_info(&info
, "Target #\tconfig3\t\tSync Capabilities\tDisconnect\n");
876 for(i
= 0; i
< 15; i
++) {
877 if(esp
->targets_present
& (1 << i
)) {
878 Scsi_Device
*SDptr
= esp
->ehost
->host_queue
;
880 while((SDptr
->host
!= esp
->ehost
) &&
885 copy_info(&info
, "%d\t\t", i
);
886 copy_info(&info
, "%08lx\t", esp
->config3
[i
]);
887 copy_info(&info
, "[%02lx,%02lx]\t\t\t", SDptr
->sync_max_offset
,
888 SDptr
->sync_min_period
);
889 copy_info(&info
, "%s\n", SDptr
->disconnect
? "yes" : "no");
893 return info
.pos
> info
.offset
? info
.pos
- info
.offset
: 0;
896 /* ESP proc filesystem code. */
897 int esp_proc_info(char *buffer
, char **start
, off_t offset
, int length
,
898 int hostno
, int inout
)
903 return -EINVAL
; /* not yet */
906 if(esp
->ehost
->host_no
== hostno
)
915 return esp_host_info(esp
, buffer
, offset
, length
);
918 static void esp_get_dmabufs(struct NCR_ESP
*esp
, Scsi_Cmnd
*sp
)
920 if(sp
->use_sg
== 0) {
921 sp
->SCp
.this_residual
= sp
->request_bufflen
;
922 sp
->SCp
.buffer
= (struct scatterlist
*) sp
->request_buffer
;
923 sp
->SCp
.buffers_residual
= 0;
924 if (esp
->dma_mmu_get_scsi_one
)
925 esp
->dma_mmu_get_scsi_one(esp
, sp
);
927 sp
->SCp
.have_data_in
= (int) sp
->SCp
.ptr
=
928 (char *) virt_to_phys(sp
->request_buffer
);
930 sp
->SCp
.buffer
= (struct scatterlist
*) sp
->buffer
;
931 sp
->SCp
.buffers_residual
= sp
->use_sg
- 1;
932 sp
->SCp
.this_residual
= sp
->SCp
.buffer
->length
;
933 if (esp
->dma_mmu_get_scsi_sgl
)
934 esp
->dma_mmu_get_scsi_sgl(esp
, sp
);
937 (char *) virt_to_phys(sp
->SCp
.buffer
->address
);
941 static void esp_release_dmabufs(struct NCR_ESP
*esp
, Scsi_Cmnd
*sp
)
943 if(sp
->use_sg
== 0) {
944 if (esp
->dma_mmu_release_scsi_one
)
945 esp
->dma_mmu_release_scsi_one(esp
, sp
);
947 if (esp
->dma_mmu_release_scsi_sgl
)
948 esp
->dma_mmu_release_scsi_sgl(esp
, sp
);
952 static void esp_restore_pointers(struct NCR_ESP
*esp
, Scsi_Cmnd
*sp
)
954 struct esp_pointers
*ep
= &esp
->data_pointers
[sp
->target
];
956 sp
->SCp
.ptr
= ep
->saved_ptr
;
957 sp
->SCp
.buffer
= ep
->saved_buffer
;
958 sp
->SCp
.this_residual
= ep
->saved_this_residual
;
959 sp
->SCp
.buffers_residual
= ep
->saved_buffers_residual
;
962 static void esp_save_pointers(struct NCR_ESP
*esp
, Scsi_Cmnd
*sp
)
964 struct esp_pointers
*ep
= &esp
->data_pointers
[sp
->target
];
966 ep
->saved_ptr
= sp
->SCp
.ptr
;
967 ep
->saved_buffer
= sp
->SCp
.buffer
;
968 ep
->saved_this_residual
= sp
->SCp
.this_residual
;
969 ep
->saved_buffers_residual
= sp
->SCp
.buffers_residual
;
974 * 1) Never ever panic while something is live on the bus.
975 * If there is to be any chance of syncing the disks this
976 * rule is to be obeyed.
978 * 2) Any target that causes a foul condition will no longer
979 * have synchronous transfers done to it, no questions
982 * 3) Keep register accesses to a minimum. Think about some
983 * day when we have Xbus machines this is running on and
984 * the ESP chip is on the other end of the machine on a
985 * different board from the cpu where this is running.
988 /* Fire off a command. We assume the bus is free and that the only
989 * case where we could see an interrupt is where we have disconnected
990 * commands active and they are trying to reselect us.
992 static inline void esp_check_cmd(struct NCR_ESP
*esp
, Scsi_Cmnd
*sp
)
994 switch(sp
->cmd_len
) {
998 esp
->esp_slowcmd
= 0;
1002 esp
->esp_slowcmd
= 1;
1003 esp
->esp_scmdleft
= sp
->cmd_len
;
1004 esp
->esp_scmdp
= &sp
->cmnd
[0];
1009 static inline void build_sync_nego_msg(struct NCR_ESP
*esp
, int period
, int offset
)
1011 esp
->cur_msgout
[0] = EXTENDED_MESSAGE
;
1012 esp
->cur_msgout
[1] = 3;
1013 esp
->cur_msgout
[2] = EXTENDED_SDTR
;
1014 esp
->cur_msgout
[3] = period
;
1015 esp
->cur_msgout
[4] = offset
;
1016 esp
->msgout_len
= 5;
1019 static void esp_exec_cmd(struct NCR_ESP
*esp
)
1021 struct ESP_regs
*eregs
= esp
->eregs
;
1024 volatile unchar
*cmdp
= esp
->esp_command
;
1025 unsigned char the_esp_command
;
1029 /* Hold off if we have disconnected commands and
1030 * an IRQ is showing...
1032 if(esp
->disconnected_SC
&& esp
->dma_irq_p(esp
))
1035 /* Grab first member of the issue queue. */
1036 SCptr
= esp
->current_SC
= remove_first_SC(&esp
->issue_SC
);
1038 /* Safe to panic here because current_SC is null. */
1040 panic("esp: esp_exec_cmd and issue queue is NULL");
1042 SDptr
= SCptr
->device
;
1044 target
= SCptr
->target
;
1047 esp
->msgout_len
= 0;
1049 /* Send it out whole, or piece by piece? The ESP
1050 * only knows how to automatically send out 6, 10,
1051 * and 12 byte commands. I used to think that the
1052 * Linux SCSI code would never throw anything other
1053 * than that to us, but then again there is the
1054 * SCSI generic driver which can send us anything.
1056 esp_check_cmd(esp
, SCptr
);
1058 /* If arbitration/selection is successful, the ESP will leave
1059 * ATN asserted, causing the target to go into message out
1060 * phase. The ESP will feed the target the identify and then
1061 * the target can only legally go to one of command,
1062 * datain/out, status, or message in phase, or stay in message
1063 * out phase (should we be trying to send a sync negotiation
1064 * message after the identify). It is not allowed to drop
1065 * BSY, but some buggy targets do and we check for this
1066 * condition in the selection complete code. Most of the time
1067 * we'll make the command bytes available to the ESP and it
1068 * will not interrupt us until it finishes command phase, we
1069 * cannot do this for command sizes the ESP does not
1070 * understand and in this case we'll get interrupted right
1071 * when the target goes into command phase.
1073 * It is absolutely _illegal_ in the presence of SCSI-2 devices
1074 * to use the ESP select w/o ATN command. When SCSI-2 devices are
1075 * present on the bus we _must_ always go straight to message out
1076 * phase with an identify message for the target. Being that
1077 * selection attempts in SCSI-1 w/o ATN was an option, doing SCSI-2
1078 * selections should not confuse SCSI-1 we hope.
1082 /* this targets sync is known */
1083 #ifdef CONFIG_SCSI_MAC_ESP
1086 if(SDptr
->disconnect
)
1087 *cmdp
++ = IDENTIFY(1, lun
);
1089 *cmdp
++ = IDENTIFY(0, lun
);
1091 if(esp
->esp_slowcmd
) {
1092 the_esp_command
= (ESP_CMD_SELAS
| ESP_CMD_DMA
);
1093 esp_advance_phase(SCptr
, in_slct_stop
);
1095 the_esp_command
= (ESP_CMD_SELA
| ESP_CMD_DMA
);
1096 esp_advance_phase(SCptr
, in_slct_norm
);
1098 } else if(!(esp
->targets_present
& (1<<target
)) || !(SDptr
->disconnect
)) {
1099 /* After the bootup SCSI code sends both the
1100 * TEST_UNIT_READY and INQUIRY commands we want
1101 * to at least attempt allowing the device to
1104 ESPMISC(("esp: Selecting device for first time. target=%d "
1105 "lun=%d\n", target
, SCptr
->lun
));
1106 if(!SDptr
->borken
&& !SDptr
->disconnect
)
1107 SDptr
->disconnect
= 1;
1109 *cmdp
++ = IDENTIFY(0, lun
);
1110 esp
->prevmsgout
= NOP
;
1111 esp_advance_phase(SCptr
, in_slct_norm
);
1112 the_esp_command
= (ESP_CMD_SELA
| ESP_CMD_DMA
);
1114 /* Take no chances... */
1115 SDptr
->sync_max_offset
= 0;
1116 SDptr
->sync_min_period
= 0;
1118 int toshiba_cdrom_hwbug_wkaround
= 0;
1120 #ifdef CONFIG_SCSI_MAC_ESP
1121 /* Never allow synchronous transfers (disconnect OK) on
1122 * Macintosh. Well, maybe later when we figured out how to
1123 * do DMA on the machines that support it ...
1125 SDptr
->disconnect
= 1;
1126 SDptr
->sync_max_offset
= 0;
1127 SDptr
->sync_min_period
= 0;
1132 /* We've talked to this guy before,
1133 * but never negotiated. Let's try
1136 if(!SDptr
->borken
) {
1137 if((SDptr
->type
== TYPE_ROM
) &&
1138 (!strncmp(SDptr
->vendor
, "TOSHIBA", 7))) {
1139 /* Nice try sucker... */
1140 ESPMISC(("esp%d: Disabling sync for buggy "
1141 "Toshiba CDROM.\n", esp
->esp_id
));
1142 toshiba_cdrom_hwbug_wkaround
= 1;
1143 build_sync_nego_msg(esp
, 0, 0);
1145 build_sync_nego_msg(esp
, esp
->sync_defp
, 15);
1148 build_sync_nego_msg(esp
, 0, 0);
1153 /* A fix for broken SCSI1 targets, when they disconnect
1154 * they lock up the bus and confuse ESP. So disallow
1155 * disconnects for SCSI1 targets for now until we
1156 * find a better fix.
1158 * Addendum: This is funny, I figured out what was going
1159 * on. The blotzed SCSI1 target would disconnect,
1160 * one of the other SCSI2 targets or both would be
1161 * disconnected as well. The SCSI1 target would
1162 * stay disconnected long enough that we start
1163 * up a command on one of the SCSI2 targets. As
1164 * the ESP is arbitrating for the bus the SCSI1
1165 * target begins to arbitrate as well to reselect
1166 * the ESP. The SCSI1 target refuses to drop it's
1167 * ID bit on the data bus even though the ESP is
1168 * at ID 7 and is the obvious winner for any
1169 * arbitration. The ESP is a poor sport and refuses
1170 * to lose arbitration, it will continue indefinately
1171 * trying to arbitrate for the bus and can only be
1172 * stopped via a chip reset or SCSI bus reset.
1173 * Therefore _no_ disconnects for SCSI1 targets
1174 * thank you very much. ;-)
1176 if(((SDptr
->scsi_level
< 3) && (SDptr
->type
!= TYPE_TAPE
)) ||
1177 toshiba_cdrom_hwbug_wkaround
|| SDptr
->borken
) {
1178 ESPMISC((KERN_INFO
"esp%d: Disabling DISCONNECT for target %d "
1179 "lun %d\n", esp
->esp_id
, SCptr
->target
, SCptr
->lun
));
1180 SDptr
->disconnect
= 0;
1181 *cmdp
++ = IDENTIFY(0, lun
);
1183 *cmdp
++ = IDENTIFY(1, lun
);
1186 /* ESP fifo is only so big...
1187 * Make this look like a slow command.
1189 esp
->esp_slowcmd
= 1;
1190 esp
->esp_scmdleft
= SCptr
->cmd_len
;
1191 esp
->esp_scmdp
= &SCptr
->cmnd
[0];
1193 the_esp_command
= (ESP_CMD_SELAS
| ESP_CMD_DMA
);
1194 esp_advance_phase(SCptr
, in_slct_msg
);
1197 if(!esp
->esp_slowcmd
)
1198 for(i
= 0; i
< SCptr
->cmd_len
; i
++)
1199 *cmdp
++ = SCptr
->cmnd
[i
];
1201 esp_write(eregs
->esp_busid
, (target
& 7));
1202 if (esp
->prev_soff
!= SDptr
->sync_max_offset
||
1203 esp
->prev_stp
!= SDptr
->sync_min_period
||
1204 (esp
->erev
> esp100a
&&
1205 esp
->prev_cfg3
!= esp
->config3
[target
])) {
1206 esp
->prev_soff
= SDptr
->sync_max_offset
;
1207 esp_write(eregs
->esp_soff
, esp
->prev_soff
);
1208 esp
->prev_stp
= SDptr
->sync_min_period
;
1209 esp_write(eregs
->esp_stp
, esp
->prev_stp
);
1210 if(esp
->erev
> esp100a
) {
1211 esp
->prev_cfg3
= esp
->config3
[target
];
1212 esp_write(eregs
->esp_cfg3
, esp
->prev_cfg3
);
1215 i
= (cmdp
- esp
->esp_command
);
1217 /* Set up the DMA and ESP counters */
1218 if(esp
->do_pio_cmds
){
1224 * It seems this is required, at least to clean up
1225 * after failed commands when using PIO mode ...
1227 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
1230 esp_write(eregs
->esp_fdata
, esp
->esp_command
[j
]);
1231 the_esp_command
&= ~ESP_CMD_DMA
;
1233 /* Tell ESP to "go". */
1234 esp_cmd(esp
, eregs
, the_esp_command
);
1236 /* Set up the ESP counters */
1237 esp_write(eregs
->esp_tclow
, i
);
1238 esp_write(eregs
->esp_tcmed
, 0);
1239 esp
->dma_init_write(esp
, esp
->esp_command_dvma
, i
);
1241 /* Tell ESP to "go". */
1242 esp_cmd(esp
, eregs
, the_esp_command
);
1246 /* Queue a SCSI command delivered from the mid-level Linux SCSI code. */
1247 int esp_queue(Scsi_Cmnd
*SCpnt
, void (*done
)(Scsi_Cmnd
*))
1249 struct NCR_ESP
*esp
;
1251 /* Set up func ptr and initial driver cmd-phase. */
1252 SCpnt
->scsi_done
= done
;
1253 SCpnt
->SCp
.phase
= not_issued
;
1255 esp
= (struct NCR_ESP
*) SCpnt
->host
->hostdata
;
1258 esp
->dma_led_on(esp
);
1260 /* We use the scratch area. */
1261 ESPQUEUE(("esp_queue: target=%d lun=%d ", SCpnt
->target
, SCpnt
->lun
));
1262 ESPDISC(("N<%02x,%02x>", SCpnt
->target
, SCpnt
->lun
));
1264 esp_get_dmabufs(esp
, SCpnt
);
1265 esp_save_pointers(esp
, SCpnt
); /* FIXME for tag queueing */
1267 SCpnt
->SCp
.Status
= CHECK_CONDITION
;
1268 SCpnt
->SCp
.Message
= 0xff;
1269 SCpnt
->SCp
.sent_command
= 0;
1271 /* Place into our queue. */
1272 if(SCpnt
->cmnd
[0] == REQUEST_SENSE
) {
1273 ESPQUEUE(("RQSENSE\n"));
1274 prepend_SC(&esp
->issue_SC
, SCpnt
);
1277 append_SC(&esp
->issue_SC
, SCpnt
);
1280 /* Run it now if we can. */
1281 if(!esp
->current_SC
&& !esp
->resetting_bus
)
1287 /* Only queuing supported in this ESP driver. */
1288 int esp_command(Scsi_Cmnd
*SCpnt
)
1291 struct NCR_ESP
*esp
= (struct NCR_ESP
*) SCpnt
->host
->hostdata
;
1294 ESPLOG(("esp%d: esp_command() called...\n", esp
->esp_id
));
1298 /* Dump driver state. */
1299 static void esp_dump_cmd(Scsi_Cmnd
*SCptr
)
1301 ESPLOG(("[tgt<%02x> lun<%02x> "
1302 "pphase<%s> cphase<%s>]",
1303 SCptr
->target
, SCptr
->lun
,
1304 phase_string(SCptr
->SCp
.sent_command
),
1305 phase_string(SCptr
->SCp
.phase
)));
1308 static void esp_dump_state(struct NCR_ESP
*esp
,
1309 struct ESP_regs
*eregs
)
1311 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
1312 #ifdef DEBUG_ESP_CMDS
1316 ESPLOG(("esp%d: dumping state\n", esp
->esp_id
));
1318 /* Print DMA status */
1319 esp
->dma_dump_state(esp
);
1321 ESPLOG(("esp%d: SW [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
1322 esp
->esp_id
, esp
->sreg
, esp
->seqreg
, esp
->ireg
));
1323 ESPLOG(("esp%d: HW reread [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
1324 esp
->esp_id
, esp_read(eregs
->esp_status
), esp_read(eregs
->esp_sstep
),
1325 esp_read(eregs
->esp_intrpt
)));
1326 #ifdef DEBUG_ESP_CMDS
1327 printk("esp%d: last ESP cmds [", esp
->esp_id
);
1328 i
= (esp
->espcmdent
- 1) & 31;
1330 esp_print_cmd(esp
->espcmdlog
[i
]);
1334 esp_print_cmd(esp
->espcmdlog
[i
]);
1338 esp_print_cmd(esp
->espcmdlog
[i
]);
1342 esp_print_cmd(esp
->espcmdlog
[i
]);
1345 #endif /* (DEBUG_ESP_CMDS) */
1348 ESPLOG(("esp%d: current command ", esp
->esp_id
));
1349 esp_dump_cmd(SCptr
);
1352 SCptr
= esp
->disconnected_SC
;
1353 ESPLOG(("esp%d: disconnected ", esp
->esp_id
));
1355 esp_dump_cmd(SCptr
);
1356 SCptr
= (Scsi_Cmnd
*) SCptr
->host_scribble
;
1361 /* Abort a command. */
1362 int esp_abort(Scsi_Cmnd
*SCptr
)
1364 struct NCR_ESP
*esp
= (struct NCR_ESP
*) SCptr
->host
->hostdata
;
1365 struct ESP_regs
*eregs
= esp
->eregs
;
1368 ESPLOG(("esp%d: Aborting command\n", esp
->esp_id
));
1369 esp_dump_state(esp
, eregs
);
1371 /* Wheee, if this is the current command on the bus, the
1372 * best we can do is assert ATN and wait for msgout phase.
1373 * This should even fix a hung SCSI bus when we lose state
1374 * in the driver and timeout because the eventual phase change
1375 * will cause the ESP to (eventually) give an interrupt.
1377 if(esp
->current_SC
== SCptr
) {
1378 esp
->cur_msgout
[0] = ABORT
;
1379 esp
->msgout_len
= 1;
1380 esp
->msgout_ctr
= 0;
1381 esp_cmd(esp
, eregs
, ESP_CMD_SATN
);
1382 return SCSI_ABORT_PENDING
;
1385 /* If it is still in the issue queue then we can safely
1386 * call the completion routine and report abort success.
1388 don
= esp
->dma_ports_p(esp
);
1390 esp
->dma_ints_off(esp
);
1394 Scsi_Cmnd
**prev
, *this;
1395 for(prev
= (&esp
->issue_SC
), this = esp
->issue_SC
;
1397 prev
= (Scsi_Cmnd
**) &(this->host_scribble
),
1398 this = (Scsi_Cmnd
*) this->host_scribble
) {
1400 *prev
= (Scsi_Cmnd
*) this->host_scribble
;
1401 this->host_scribble
= NULL
;
1402 esp_release_dmabufs(esp
, this);
1403 this->result
= DID_ABORT
<< 16;
1406 esp
->dma_ints_on(esp
);
1407 return SCSI_ABORT_SUCCESS
;
1412 /* Yuck, the command to abort is disconnected, it is not
1413 * worth trying to abort it now if something else is live
1414 * on the bus at this time. So, we let the SCSI code wait
1415 * a little bit and try again later.
1417 if(esp
->current_SC
) {
1419 esp
->dma_ints_on(esp
);
1420 return SCSI_ABORT_BUSY
;
1423 /* It's disconnected, we have to reconnect to re-establish
1424 * the nexus and tell the device to abort. However, we really
1425 * cannot 'reconnect' per se, therefore we tell the upper layer
1426 * the safest thing we can. This is, wait a bit, if nothing
1427 * happens, we are really hung so reset the bus.
1431 esp
->dma_ints_on(esp
);
1432 return SCSI_ABORT_SNOOZE
;
1435 /* We've sent ESP_CMD_RS to the ESP, the interrupt had just
1436 * arrived indicating the end of the SCSI bus reset. Our job
1437 * is to clean out the command queues and begin re-execution
1438 * of SCSI commands once more.
1440 static int esp_finish_reset(struct NCR_ESP
*esp
,
1441 struct ESP_regs
*eregs
)
1443 Scsi_Cmnd
*sp
= esp
->current_SC
;
1445 /* Clean up currently executing command, if any. */
1447 esp_release_dmabufs(esp
, sp
);
1448 sp
->result
= (DID_RESET
<< 16);
1450 esp
->current_SC
= NULL
;
1453 /* Clean up disconnected queue, they have been invalidated
1456 if (esp
->disconnected_SC
) {
1457 while((sp
= remove_first_SC(&esp
->disconnected_SC
)) != NULL
) {
1458 esp_release_dmabufs(esp
, sp
);
1459 sp
->result
= (DID_RESET
<< 16);
1464 /* SCSI bus reset is complete. */
1465 esp
->resetting_bus
= 0;
1467 /* Ok, now it is safe to get commands going once more. */
1474 static int esp_do_resetbus(struct NCR_ESP
*esp
,
1475 struct ESP_regs
*eregs
)
1477 ESPLOG(("esp%d: Resetting scsi bus\n", esp
->esp_id
));
1478 esp
->resetting_bus
= 1;
1479 esp_cmd(esp
, eregs
, ESP_CMD_RS
);
1484 /* Reset ESP chip, reset hanging bus, then kill active and
1485 * disconnected commands for targets without soft reset.
1487 int esp_reset(Scsi_Cmnd
*SCptr
, unsigned int how
)
1489 struct NCR_ESP
*esp
= (struct NCR_ESP
*) SCptr
->host
->hostdata
;
1491 (void) esp_do_resetbus(esp
, esp
->eregs
);
1492 return SCSI_RESET_PENDING
;
1495 /* Internal ESP done function. */
1496 static void esp_done(struct NCR_ESP
*esp
, int error
)
1500 if(esp
->current_SC
) {
1501 done_SC
= esp
->current_SC
;
1502 esp
->current_SC
= NULL
;
1503 esp_release_dmabufs(esp
, done_SC
);
1504 done_SC
->result
= error
;
1505 done_SC
->scsi_done(done_SC
);
1507 /* Bus is free, issue any commands in the queue. */
1508 if(esp
->issue_SC
&& !esp
->current_SC
)
1511 /* Panic is safe as current_SC is null so we may still
1512 * be able to accept more commands to sync disk buffers.
1514 ESPLOG(("panicing\n"));
1515 panic("esp: done() called with NULL esp->current_SC");
1519 /* Wheee, ESP interrupt engine. */
1521 /* Forward declarations. */
1522 static int esp_do_phase_determine(struct NCR_ESP
*esp
,
1523 struct ESP_regs
*eregs
);
1524 static int esp_do_data_finale(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
);
1525 static int esp_select_complete(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
);
1526 static int esp_do_status(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
);
1527 static int esp_do_msgin(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
);
1528 static int esp_do_msgindone(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
);
1529 static int esp_do_msgout(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
);
1530 static int esp_do_cmdbegin(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
);
1532 #define sreg_datainp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DIP)
1533 #define sreg_dataoutp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DOP)
1535 /* We try to avoid some interrupts by jumping ahead and see if the ESP
1536 * has gotten far enough yet. Hence the following.
1538 static inline int skipahead1(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
,
1539 Scsi_Cmnd
*scp
, int prev_phase
, int new_phase
)
1541 if(scp
->SCp
.sent_command
!= prev_phase
)
1544 if(esp
->dma_irq_p(esp
)) {
1545 /* Yes, we are able to save an interrupt. */
1546 esp
->sreg
= (esp_read(eregs
->esp_status
) & ~(ESP_STAT_INTR
));
1547 esp
->ireg
= esp_read(eregs
->esp_intrpt
);
1548 if(!(esp
->ireg
& ESP_INTR_SR
))
1551 return do_reset_complete
;
1553 /* Ho hum, target is taking forever... */
1554 scp
->SCp
.sent_command
= new_phase
; /* so we don't recurse... */
1558 static inline int skipahead2(struct NCR_ESP
*esp
,
1559 struct ESP_regs
*eregs
,
1560 Scsi_Cmnd
*scp
, int prev_phase1
, int prev_phase2
,
1563 if(scp
->SCp
.sent_command
!= prev_phase1
&&
1564 scp
->SCp
.sent_command
!= prev_phase2
)
1566 if(esp
->dma_irq_p(esp
)) {
1567 /* Yes, we are able to save an interrupt. */
1568 esp
->sreg
= (esp_read(eregs
->esp_status
) & ~(ESP_STAT_INTR
));
1569 esp
->ireg
= esp_read(eregs
->esp_intrpt
);
1570 if(!(esp
->ireg
& ESP_INTR_SR
))
1573 return do_reset_complete
;
1575 /* Ho hum, target is taking forever... */
1576 scp
->SCp
.sent_command
= new_phase
; /* so we don't recurse... */
1580 /* Misc. esp helper macros. */
1581 #define esp_setcount(__eregs, __cnt) \
1582 esp_write((__eregs)->esp_tclow, ((__cnt) & 0xff)); \
1583 esp_write((__eregs)->esp_tcmed, (((__cnt) >> 8) & 0xff))
1585 #define esp_getcount(__eregs) \
1586 ((esp_read((__eregs)->esp_tclow)&0xff) | \
1587 ((esp_read((__eregs)->esp_tcmed)&0xff) << 8))
1589 #define fcount(__esp, __eregs) \
1590 (esp_read((__eregs)->esp_fflags) & ESP_FF_FBYTES)
1592 #define fnzero(__esp, __eregs) \
1593 (esp_read((__eregs)->esp_fflags) & ESP_FF_ONOTZERO)
1595 /* XXX speculative nops unnecessary when continuing amidst a data phase
1596 * XXX even on esp100!!! another case of flooding the bus with I/O reg
1599 #define esp_maybe_nop(__esp, __eregs) \
1600 if((__esp)->erev == esp100) \
1601 esp_cmd((__esp), (__eregs), ESP_CMD_NULL)
1603 #define sreg_to_dataphase(__sreg) \
1604 ((((__sreg) & ESP_STAT_PMASK) == ESP_DOP) ? in_dataout : in_datain)
1606 /* The ESP100 when in synchronous data phase, can mistake a long final
1607 * REQ pulse from the target as an extra byte, it places whatever is on
1608 * the data lines into the fifo. For now, we will assume when this
1609 * happens that the target is a bit quirky and we don't want to
1610 * be talking synchronously to it anyways. Regardless, we need to
1611 * tell the ESP to eat the extraneous byte so that we can proceed
1612 * to the next phase.
1614 static inline int esp100_sync_hwbug(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
,
1615 Scsi_Cmnd
*sp
, int fifocnt
)
1617 /* Do not touch this piece of code. */
1618 if((!(esp
->erev
== esp100
)) ||
1619 (!(sreg_datainp((esp
->sreg
= esp_read(eregs
->esp_status
))) && !fifocnt
) &&
1620 !(sreg_dataoutp(esp
->sreg
) && !fnzero(esp
, eregs
)))) {
1621 if(sp
->SCp
.phase
== in_dataout
)
1622 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
1625 /* Async mode for this guy. */
1626 build_sync_nego_msg(esp
, 0, 0);
1628 /* Ack the bogus byte, but set ATN first. */
1629 esp_cmd(esp
, eregs
, ESP_CMD_SATN
);
1630 esp_cmd(esp
, eregs
, ESP_CMD_MOK
);
1635 /* This closes the window during a selection with a reselect pending, because
1636 * we use DMA for the selection process the FIFO should hold the correct
1637 * contents if we get reselected during this process. So we just need to
1638 * ack the possible illegal cmd interrupt pending on the esp100.
1640 static inline int esp100_reconnect_hwbug(struct NCR_ESP
*esp
,
1641 struct ESP_regs
*eregs
)
1643 volatile unchar junk
;
1645 if(esp
->erev
!= esp100
)
1647 junk
= esp_read(eregs
->esp_intrpt
);
1649 if(junk
& ESP_INTR_SR
)
1654 /* This verifies the BUSID bits during a reselection so that we know which
1655 * target is talking to us.
1657 static inline int reconnect_target(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
1659 int it
, me
= esp
->scsi_id_mask
, targ
= 0;
1661 if(2 != fcount(esp
, eregs
))
1663 it
= esp_read(eregs
->esp_fdata
);
1674 /* This verifies the identify from the target so that we know which lun is
1675 * being reconnected.
1677 static inline int reconnect_lun(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
1681 if((esp
->sreg
& ESP_STAT_PMASK
) != ESP_MIP
)
1683 lun
= esp_read(eregs
->esp_fdata
);
1685 /* Yes, you read this correctly. We report lun of zero
1686 * if we see parity error. ESP reports parity error for
1687 * the lun byte, and this is the only way to hope to recover
1688 * because the target is connected.
1690 if(esp
->sreg
& ESP_STAT_PERR
)
1693 /* Check for illegal bits being set in the lun. */
1694 if((lun
& 0x40) || !(lun
& 0x80))
1700 /* This puts the driver in a state where it can revitalize a command that
1701 * is being continued due to reselection.
1703 static inline void esp_connect(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
,
1706 Scsi_Device
*dp
= sp
->device
;
1708 if(esp
->prev_soff
!= dp
->sync_max_offset
||
1709 esp
->prev_stp
!= dp
->sync_min_period
||
1710 (esp
->erev
> esp100a
&&
1711 esp
->prev_cfg3
!= esp
->config3
[sp
->target
])) {
1712 esp
->prev_soff
= dp
->sync_max_offset
;
1713 esp_write(eregs
->esp_soff
, esp
->prev_soff
);
1714 esp
->prev_stp
= dp
->sync_min_period
;
1715 esp_write(eregs
->esp_stp
, esp
->prev_stp
);
1716 if(esp
->erev
> esp100a
) {
1717 esp
->prev_cfg3
= esp
->config3
[sp
->target
];
1718 esp_write(eregs
->esp_cfg3
, esp
->prev_cfg3
);
1721 esp
->current_SC
= sp
;
1724 /* This will place the current working command back into the issue queue
1725 * if we are to receive a reselection amidst a selection attempt.
1727 static inline void esp_reconnect(struct NCR_ESP
*esp
, Scsi_Cmnd
*sp
)
1729 if(!esp
->disconnected_SC
)
1730 ESPLOG(("esp%d: Weird, being reselected but disconnected "
1731 "command queue is empty.\n", esp
->esp_id
));
1733 esp
->current_SC
= 0;
1734 sp
->SCp
.phase
= not_issued
;
1735 append_SC(&esp
->issue_SC
, sp
);
1738 /* Begin message in phase. */
1739 static int esp_do_msgin(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
1741 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
1742 esp_maybe_nop(esp
, eregs
);
1743 esp_cmd(esp
, eregs
, ESP_CMD_TI
);
1746 esp_advance_phase(esp
->current_SC
, in_msgindone
);
1750 static inline void advance_sg(struct NCR_ESP
*esp
, Scsi_Cmnd
*sp
)
1753 --sp
->SCp
.buffers_residual
;
1754 sp
->SCp
.this_residual
= sp
->SCp
.buffer
->length
;
1755 if (esp
->dma_advance_sg
)
1756 esp
->dma_advance_sg (sp
);
1758 sp
->SCp
.ptr
= (char *)virt_to_phys(sp
->SCp
.buffer
->address
);
1761 /* Please note that the way I've coded these routines is that I _always_
1762 * check for a disconnect during any and all information transfer
1763 * phases. The SCSI standard states that the target _can_ cause a BUS
1764 * FREE condition by dropping all MSG/CD/IO/BSY signals. Also note
1765 * that during information transfer phases the target controls every
1766 * change in phase, the only thing the initiator can do is "ask" for
1767 * a message out phase by driving ATN true. The target can, and sometimes
1768 * will, completely ignore this request so we cannot assume anything when
1769 * we try to force a message out phase to abort/reset a target. Most of
1770 * the time the target will eventually be nice and go to message out, so
1771 * we may have to hold on to our state about what we want to tell the target
1772 * for some period of time.
1775 /* I think I have things working here correctly. Even partial transfers
1776 * within a buffer or sub-buffer should not upset us at all no matter
1777 * how bad the target and/or ESP fucks things up.
1779 static int esp_do_data(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
1781 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
1782 int thisphase
, hmuch
;
1784 ESPDATA(("esp_do_data: "));
1785 esp_maybe_nop(esp
, eregs
);
1786 thisphase
= sreg_to_dataphase(esp
->sreg
);
1787 esp_advance_phase(SCptr
, thisphase
);
1788 ESPDATA(("newphase<%s> ", (thisphase
== in_datain
) ? "DATAIN" : "DATAOUT"));
1789 hmuch
= esp
->dma_can_transfer(esp
, SCptr
);
1792 * XXX MSch: cater for PIO transfer here; PIO used if hmuch == 0
1794 if (hmuch
) { /* DMA */
1798 ESPDATA(("hmuch<%d> ", hmuch
));
1799 esp
->current_transfer_size
= hmuch
;
1800 esp_setcount(eregs
, (esp
->fas_premature_intr_workaround
?
1801 (hmuch
+ 0x40) : hmuch
));
1802 esp
->dma_setup(esp
, (__u32
)((unsigned long)SCptr
->SCp
.ptr
),
1803 hmuch
, (thisphase
== in_datain
));
1804 ESPDATA(("DMA|TI --> do_intr_end\n"));
1805 esp_cmd(esp
, eregs
, ESP_CMD_DMA
| ESP_CMD_TI
);
1814 int oldphase
, i
= 0; /* or where we left off last time ?? esp->current_data ?? */
1817 oldphase
= esp_read(eregs
->esp_status
) & ESP_STAT_PMASK
;
1820 * polled transfer; ugly, can we make this happen in a DRQ
1821 * interrupt handler ??
1822 * requires keeping track of state information in host or
1824 * Problem: I've never seen a DRQ happen on Mac, not even
1825 * with ESP_CMD_DMA ...
1828 /* figure out how much needs to be transfered */
1829 hmuch
= SCptr
->SCp
.this_residual
;
1830 ESPDATA(("hmuch<%d> pio ", hmuch
));
1831 esp
->current_transfer_size
= hmuch
;
1833 /* tell the ESP ... */
1834 esp_setcount(eregs
, hmuch
);
1838 int j
, fifo_stuck
= 0, newphase
;
1839 unsigned long flags
, timeout
;
1844 ESPDATA(( /*"\n"*/ "\r"));
1850 if(thisphase
== in_datain
) {
1852 esp_cmd(esp
, eregs
, ESP_CMD_TI
);
1856 while (!((esp
->sreg
=esp_read(eregs
->esp_status
)) & ESP_STAT_INTR
) && --timeout
)
1859 printk("DRQ datain timeout! \n");
1861 newphase
= esp
->sreg
& ESP_STAT_PMASK
;
1863 /* see how much we got ... */
1864 fifocnt
= (esp_read(eregs
->esp_fflags
) & ESP_FF_FBYTES
);
1871 ESPDATA(("\rgot %d st %x ph %x", fifocnt
, esp
->sreg
, newphase
));
1874 for(j
=0;j
<fifocnt
;j
++)
1875 SCptr
->SCp
.ptr
[i
++] = esp_read(eregs
->esp_fdata
);
1877 ESPDATA(("(%d) ", i
));
1879 /* how many to go ?? */
1882 /* break if status phase !! */
1883 if(newphase
== ESP_STATP
) {
1885 esp
->ireg
= esp_read(eregs
->esp_intrpt
);
1890 /* how much will fit ? */
1891 int this_count
= MAX_FIFO
- fifocnt
;
1892 if (this_count
> hmuch
)
1896 for(j
=0;j
<this_count
;j
++)
1897 esp_write(eregs
->esp_fdata
, SCptr
->SCp
.ptr
[i
++]);
1899 /* how many left if this goes out ?? */
1900 hmuch
-= this_count
;
1903 esp_cmd(esp
, eregs
, ESP_CMD_TI
);
1905 /* wait for 'got it' */
1907 while (!((esp
->sreg
=esp_read(eregs
->esp_status
)) & ESP_STAT_INTR
) && --timeout
)
1910 printk("DRQ dataout timeout! \n");
1912 newphase
= esp
->sreg
& ESP_STAT_PMASK
;
1914 /* need to check how much was sent ?? */
1915 fifocnt
= (esp_read(eregs
->esp_fflags
) & ESP_FF_FBYTES
);
1917 ESPDATA(("\rsent %d st %x ph %x", this_count
- fifocnt
, esp
->sreg
, newphase
));
1919 ESPDATA(("(%d) ", i
));
1921 /* break if status phase !! */
1922 if(newphase
== ESP_STATP
) {
1924 esp
->ireg
= esp_read(eregs
->esp_intrpt
);
1931 esp
->ireg
= esp_read(eregs
->esp_intrpt
);
1933 ESPDATA(("ir %x ... ", esp
->ireg
));
1936 ESPDATA(("done! \n"));
1938 restore_flags(flags
);
1940 /* check new bus phase */
1941 if (newphase
!= oldphase
&& i
< esp
->current_transfer_size
) {
1942 /* something happened; disconnect ?? */
1943 ESPDATA(("phase change, dropped out with %d done ... ", i
));
1947 /* check int. status */
1948 if (esp
->ireg
& ESP_INTR_DC
) {
1950 ESPDATA(("disconnect; %d transfered ... ", i
));
1952 } else if (esp
->ireg
& ESP_INTR_FDONE
) {
1954 ESPDATA(("function done; %d transfered ... ", i
));
1958 /* XXX fixme: bail out on stall */
1959 if (fifo_stuck
> 10) {
1961 ESPDATA(("fifo stall; %d transfered ... ", i
));
1967 /* check successful completion ?? */
1969 if (thisphase
== in_dataout
)
1970 hmuch
+= fifocnt
; /* stuck?? adjust data pointer ...*/
1972 /* tell do_data_finale how much was transfered */
1973 esp
->current_transfer_size
-= hmuch
;
1975 /* still not completely sure on this one ... */
1976 return /*do_intr_end*/ do_work_bus
/*do_phase_determine*/ ;
1985 /* See how successful the data transfer was. */
1986 static int esp_do_data_finale(struct NCR_ESP
*esp
,
1987 struct ESP_regs
*eregs
)
1989 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
1990 int bogus_data
= 0, bytes_sent
= 0, fifocnt
, ecount
= 0;
1992 if(esp
->dma_led_off
)
1993 esp
->dma_led_off(esp
);
1995 ESPDATA(("esp_do_data_finale: "));
1997 if(SCptr
->SCp
.phase
== in_datain
) {
1998 if(esp
->sreg
& ESP_STAT_PERR
) {
1999 /* Yuck, parity error. The ESP asserts ATN
2000 * so that we can go to message out phase
2001 * immediately and inform the target that
2002 * something bad happened.
2004 ESPLOG(("esp%d: data bad parity detected.\n",
2006 esp
->cur_msgout
[0] = INITIATOR_ERROR
;
2007 esp
->msgout_len
= 1;
2010 esp
->dma_drain(esp
);
2012 if(esp
->dma_invalidate
)
2013 esp
->dma_invalidate(esp
);
2015 /* This could happen for the above parity error case. */
2016 if(!(esp
->ireg
== ESP_INTR_BSERV
)) {
2017 /* Please go to msgout phase, please please please... */
2018 ESPLOG(("esp%d: !BSERV after data, probably to msgout\n",
2020 return esp_do_phase_determine(esp
, eregs
);
2023 /* Check for partial transfers and other horrible events. */
2024 fifocnt
= (esp_read(eregs
->esp_fflags
) & ESP_FF_FBYTES
);
2025 ecount
= esp_getcount(eregs
);
2026 if(esp
->fas_premature_intr_workaround
)
2028 bytes_sent
= esp
->current_transfer_size
;
2030 ESPDATA(("trans_sz=%d, ", bytes_sent
));
2031 if(!(esp
->sreg
& ESP_STAT_TCNT
))
2032 bytes_sent
-= ecount
;
2033 if(SCptr
->SCp
.phase
== in_dataout
)
2034 bytes_sent
-= fifocnt
;
2036 ESPDATA(("bytes_sent=%d (ecount=%d, fifocnt=%d), ", bytes_sent
,
2039 /* If we were in synchronous mode, check for peculiarities. */
2040 if(SCptr
->device
->sync_max_offset
)
2041 bogus_data
= esp100_sync_hwbug(esp
, eregs
, SCptr
, fifocnt
);
2043 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
2045 /* Until we are sure of what has happened, we are certainly
2048 esp_advance_phase(SCptr
, in_the_dark
);
2050 /* Check for premature interrupt condition. Can happen on FAS2x6
2051 * chips. QLogic recommends a workaround by overprogramming the
2052 * transfer counters, but this makes doing scatter-gather impossible.
2053 * Until there is a way to disable scatter-gather for a single target,
2054 * and not only for the entire host adapter as it is now, the workaround
2055 * is way to expensive performance wise.
2056 * Instead, it turns out that when this happens the target has disconnected
2057 * allready but it doesn't show in the interrupt register. Compensate for
2058 * that here to try and avoid a SCSI bus reset.
2060 if(!esp
->fas_premature_intr_workaround
&& (fifocnt
== 1) &&
2061 sreg_dataoutp(esp
->sreg
)) {
2062 ESPLOG(("esp%d: Premature interrupt, enabling workaround\n",
2065 /* Disable scatter-gather operations, they are not possible
2066 * when using this workaround.
2068 esp
->ehost
->sg_tablesize
= 0;
2069 esp
->ehost
->use_clustering
= ENABLE_CLUSTERING
;
2070 esp
->fas_premature_intr_workaround
= 1;
2073 ESPLOG(("esp%d: Aborting scatter-gather operation\n",
2075 esp
->cur_msgout
[0] = ABORT
;
2076 esp
->msgout_len
= 1;
2077 esp
->msgout_ctr
= 0;
2078 esp_cmd(esp
, eregs
, ESP_CMD_SATN
);
2079 esp_setcount(eregs
, 0xffff);
2080 esp_cmd(esp
, eregs
, ESP_CMD_NULL
);
2081 esp_cmd(esp
, eregs
, ESP_CMD_TPAD
| ESP_CMD_DMA
);
2085 /* Just set the disconnected bit. That's what appears to
2086 * happen anyway. The state machine will pick it up when
2089 esp
->ireg
|= ESP_INTR_DC
;
2093 if(bytes_sent
< 0) {
2094 /* I've seen this happen due to lost state in this
2095 * driver. No idea why it happened, but allowing
2096 * this value to be negative caused things to
2097 * lock up. This allows greater chance of recovery.
2098 * In fact every time I've seen this, it has been
2099 * a driver bug without question.
2101 ESPLOG(("esp%d: yieee, bytes_sent < 0!\n", esp
->esp_id
));
2102 ESPLOG(("esp%d: csz=%d fifocount=%d ecount=%d\n",
2104 esp
->current_transfer_size
, fifocnt
, ecount
));
2105 ESPLOG(("esp%d: use_sg=%d ptr=%p this_residual=%d\n",
2107 SCptr
->use_sg
, SCptr
->SCp
.ptr
, SCptr
->SCp
.this_residual
));
2108 ESPLOG(("esp%d: Forcing async for target %d\n", esp
->esp_id
,
2110 SCptr
->device
->borken
= 1;
2111 SCptr
->device
->sync
= 0;
2115 /* Update the state of our transfer. */
2116 SCptr
->SCp
.ptr
+= bytes_sent
;
2117 SCptr
->SCp
.this_residual
-= bytes_sent
;
2118 if(SCptr
->SCp
.this_residual
< 0) {
2120 ESPLOG(("esp%d: Data transfer overrun.\n", esp
->esp_id
));
2121 SCptr
->SCp
.this_residual
= 0;
2124 /* Maybe continue. */
2126 ESPDATA(("!bogus_data, "));
2127 /* NO MATTER WHAT, we advance the scatterlist,
2128 * if the target should decide to disconnect
2129 * in between scatter chunks (which is common)
2130 * we could die horribly! I used to have the sg
2131 * advance occur only if we are going back into
2132 * (or are staying in) a data phase, you can
2133 * imagine the hell I went through trying to
2136 if(!SCptr
->SCp
.this_residual
&& SCptr
->SCp
.buffers_residual
)
2137 advance_sg(esp
, SCptr
);
2138 #ifdef DEBUG_ESP_DATA
2139 if(sreg_datainp(esp
->sreg
) || sreg_dataoutp(esp
->sreg
)) {
2140 ESPDATA(("to more data\n"));
2142 ESPDATA(("to new phase\n"));
2145 return esp_do_phase_determine(esp
, eregs
);
2147 /* Bogus data, just wait for next interrupt. */
2148 ESPLOG(("esp%d: bogus_data during end of data phase\n",
2153 /* We received a non-good status return at the end of
2154 * running a SCSI command. This is used to decide if
2155 * we should clear our synchronous transfer state for
2156 * such a device when that happens.
2158 * The idea is that when spinning up a disk or rewinding
2159 * a tape, we don't want to go into a loop re-negotiating
2160 * synchronous capabilities over and over.
2162 static int esp_should_clear_sync(Scsi_Cmnd
*sp
)
2164 unchar cmd1
= sp
->cmnd
[0];
2165 unchar cmd2
= sp
->data_cmnd
[0];
2167 /* These cases are for spinning up a disk and
2168 * waiting for that spinup to complete.
2170 if(cmd1
== START_STOP
||
2174 if(cmd1
== TEST_UNIT_READY
||
2175 cmd2
== TEST_UNIT_READY
)
2178 /* One more special case for SCSI tape drives,
2179 * this is what is used to probe the device for
2180 * completion of a rewind or tape load operation.
2182 if(sp
->device
->type
== TYPE_TAPE
) {
2183 if(cmd1
== MODE_SENSE
||
2191 /* Either a command is completing or a target is dropping off the bus
2192 * to continue the command in the background so we can do other work.
2194 static int esp_do_freebus(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
2196 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
2199 rval
= skipahead2(esp
, eregs
, SCptr
, in_status
, in_msgindone
, in_freeing
);
2203 if(esp
->ireg
!= ESP_INTR_DC
) {
2204 ESPLOG(("esp%d: Target will not disconnect\n", esp
->esp_id
));
2205 return do_reset_bus
; /* target will not drop BSY... */
2207 esp
->msgout_len
= 0;
2208 esp
->prevmsgout
= NOP
;
2209 if(esp
->prevmsgin
== COMMAND_COMPLETE
) {
2210 /* Normal end of nexus. */
2211 if(esp
->disconnected_SC
)
2212 esp_cmd(esp
, eregs
, ESP_CMD_ESEL
);
2214 if(SCptr
->SCp
.Status
!= GOOD
&&
2215 SCptr
->SCp
.Status
!= CONDITION_GOOD
&&
2216 ((1<<SCptr
->target
) & esp
->targets_present
) &&
2217 SCptr
->device
->sync
&&
2218 SCptr
->device
->sync_max_offset
) {
2219 /* SCSI standard says that the synchronous capabilities
2220 * should be renegotiated at this point. Most likely
2221 * we are about to request sense from this target
2222 * in which case we want to avoid using sync
2223 * transfers until we are sure of the current target
2226 ESPMISC(("esp: Status <%d> for target %d lun %d\n",
2227 SCptr
->SCp
.Status
, SCptr
->target
, SCptr
->lun
));
2229 /* But don't do this when spinning up a disk at
2230 * boot time while we poll for completion as it
2231 * fills up the console with messages. Also, tapes
2232 * can report not ready many times right after
2233 * loading up a tape.
2235 if(esp_should_clear_sync(SCptr
) != 0)
2236 SCptr
->device
->sync
= 0;
2238 ESPDISC(("F<%02x,%02x>", SCptr
->target
, SCptr
->lun
));
2239 esp_done(esp
, ((SCptr
->SCp
.Status
& 0xff) |
2240 ((SCptr
->SCp
.Message
& 0xff)<<8) |
2242 } else if(esp
->prevmsgin
== DISCONNECT
) {
2243 /* Normal disconnect. */
2244 esp_cmd(esp
, eregs
, ESP_CMD_ESEL
);
2245 ESPDISC(("D<%02x,%02x>", SCptr
->target
, SCptr
->lun
));
2246 append_SC(&esp
->disconnected_SC
, SCptr
);
2247 esp
->current_SC
= NULL
;
2251 /* Driver bug, we do not expect a disconnect here
2252 * and should not have advanced the state engine
2255 ESPLOG(("esp%d: last msg not disc and not cmd cmplt.\n",
2257 return do_reset_bus
;
2262 /* When a reselect occurs, and we cannot find the command to
2263 * reconnect to in our queues, we do this.
2265 static int esp_bad_reconnect(struct NCR_ESP
*esp
)
2269 ESPLOG(("esp%d: Eieeee, reconnecting unknown command!\n",
2271 ESPLOG(("QUEUE DUMP\n"));
2273 ESPLOG(("esp%d: issue_SC[", esp
->esp_id
));
2275 ESPLOG(("<%02x,%02x>", sp
->target
, sp
->lun
));
2276 sp
= (Scsi_Cmnd
*) sp
->host_scribble
;
2279 sp
= esp
->current_SC
;
2280 ESPLOG(("esp%d: current_SC[", esp
->esp_id
));
2282 ESPLOG(("<%02x,%02x>", sp
->target
, sp
->lun
));
2283 sp
= (Scsi_Cmnd
*) sp
->host_scribble
;
2286 sp
= esp
->disconnected_SC
;
2287 ESPLOG(("esp%d: disconnected_SC[", esp
->esp_id
));
2289 ESPLOG(("<%02x,%02x>", sp
->target
, sp
->lun
));
2290 sp
= (Scsi_Cmnd
*) sp
->host_scribble
;
2293 return do_reset_bus
;
2296 /* Do the needy when a target tries to reconnect to us. */
2297 static int esp_do_reconnect(struct NCR_ESP
*esp
,
2298 struct ESP_regs
*eregs
)
2303 /* Check for all bogus conditions first. */
2304 target
= reconnect_target(esp
, eregs
);
2306 ESPDISC(("bad bus bits\n"));
2307 return do_reset_bus
;
2309 lun
= reconnect_lun(esp
, eregs
);
2311 ESPDISC(("target=%2x, bad identify msg\n", target
));
2312 return do_reset_bus
;
2315 /* Things look ok... */
2316 ESPDISC(("R<%02x,%02x>", target
, lun
));
2318 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
2319 if(esp100_reconnect_hwbug(esp
, eregs
))
2320 return do_reset_bus
;
2321 esp_cmd(esp
, eregs
, ESP_CMD_NULL
);
2323 SCptr
= remove_SC(&esp
->disconnected_SC
, (unchar
) target
, (unchar
) lun
);
2325 return esp_bad_reconnect(esp
);
2327 esp_connect(esp
, eregs
, SCptr
);
2328 esp_cmd(esp
, eregs
, ESP_CMD_MOK
);
2330 /* Reconnect implies a restore pointers operation. */
2331 esp_restore_pointers(esp
, SCptr
);
2334 esp_advance_phase(SCptr
, in_the_dark
);
2338 /* End of NEXUS (hopefully), pick up status + message byte then leave if
2341 static int esp_do_status(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
2343 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
2346 rval
= skipahead1(esp
, eregs
, SCptr
, in_the_dark
, in_status
);
2351 ESPSTAT(("esp_do_status: "));
2352 if(intr
!= ESP_INTR_DC
) {
2353 int message_out
= 0; /* for parity problems */
2355 /* Ack the message. */
2356 ESPSTAT(("ack msg, "));
2357 esp_cmd(esp
, eregs
, ESP_CMD_MOK
);
2360 esp
->dma_poll(esp
, (unsigned char *) esp
->esp_command
);
2362 ESPSTAT(("got something, "));
2363 /* ESP chimes in with one of
2365 * 1) function done interrupt:
2366 * both status and message in bytes
2369 * 2) bus service interrupt:
2370 * only status byte was acquired
2373 * can't happen, but we test for it
2376 * ALSO: If bad parity was detected on either
2377 * the status _or_ the message byte then
2378 * the ESP has asserted ATN on the bus
2379 * and we must therefore wait for the
2380 * next phase change.
2382 if(intr
& ESP_INTR_FDONE
) {
2383 /* We got it all, hallejulia. */
2384 ESPSTAT(("got both, "));
2385 SCptr
->SCp
.Status
= esp
->esp_command
[0];
2386 SCptr
->SCp
.Message
= esp
->esp_command
[1];
2387 esp
->prevmsgin
= SCptr
->SCp
.Message
;
2388 esp
->cur_msgin
[0] = SCptr
->SCp
.Message
;
2389 if(esp
->sreg
& ESP_STAT_PERR
) {
2390 /* There was bad parity for the
2391 * message byte, the status byte
2394 message_out
= MSG_PARITY_ERROR
;
2396 } else if(intr
== ESP_INTR_BSERV
) {
2397 /* Only got status byte. */
2398 ESPLOG(("esp%d: got status only, ", esp
->esp_id
));
2399 if(!(esp
->sreg
& ESP_STAT_PERR
)) {
2400 SCptr
->SCp
.Status
= esp
->esp_command
[0];
2401 SCptr
->SCp
.Message
= 0xff;
2403 /* The status byte had bad parity.
2404 * we leave the scsi_pointer Status
2405 * field alone as we set it to a default
2406 * of CHECK_CONDITION in esp_queue.
2408 message_out
= INITIATOR_ERROR
;
2411 /* This shouldn't happen ever. */
2412 ESPSTAT(("got bolixed\n"));
2413 esp_advance_phase(SCptr
, in_the_dark
);
2414 return esp_do_phase_determine(esp
, eregs
);
2418 ESPSTAT(("status=%2x msg=%2x, ", SCptr
->SCp
.Status
,
2419 SCptr
->SCp
.Message
));
2420 if(SCptr
->SCp
.Message
== COMMAND_COMPLETE
) {
2421 ESPSTAT(("and was COMMAND_COMPLETE\n"));
2422 esp_advance_phase(SCptr
, in_freeing
);
2423 return esp_do_freebus(esp
, eregs
);
2425 ESPLOG(("esp%d: and _not_ COMMAND_COMPLETE\n",
2427 esp
->msgin_len
= esp
->msgin_ctr
= 1;
2428 esp_advance_phase(SCptr
, in_msgindone
);
2429 return esp_do_msgindone(esp
, eregs
);
2432 /* With luck we'll be able to let the target
2433 * know that bad parity happened, it will know
2434 * which byte caused the problems and send it
2435 * again. For the case where the status byte
2436 * receives bad parity, I do not believe most
2437 * targets recover very well. We'll see.
2439 ESPLOG(("esp%d: bad parity somewhere mout=%2x\n",
2440 esp
->esp_id
, message_out
));
2441 esp
->cur_msgout
[0] = message_out
;
2442 esp
->msgout_len
= esp
->msgout_ctr
= 1;
2443 esp_advance_phase(SCptr
, in_the_dark
);
2444 return esp_do_phase_determine(esp
, eregs
);
2447 /* If we disconnect now, all hell breaks loose. */
2448 ESPLOG(("esp%d: whoops, disconnect\n", esp
->esp_id
));
2449 esp_advance_phase(SCptr
, in_the_dark
);
2450 return esp_do_phase_determine(esp
, eregs
);
2454 static int esp_enter_status(struct NCR_ESP
*esp
,
2455 struct ESP_regs
*eregs
)
2457 unchar thecmd
= ESP_CMD_ICCSEQ
;
2459 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
2461 if(esp
->do_pio_cmds
) {
2462 esp_advance_phase(esp
->current_SC
, in_status
);
2463 esp_cmd(esp
, eregs
, thecmd
);
2464 while(!(esp_read(esp
->eregs
->esp_status
) & ESP_STAT_INTR
));
2465 esp
->esp_command
[0] = esp_read(eregs
->esp_fdata
);
2466 while(!(esp_read(esp
->eregs
->esp_status
) & ESP_STAT_INTR
));
2467 esp
->esp_command
[1] = esp_read(eregs
->esp_fdata
);
2469 esp
->esp_command
[0] = esp
->esp_command
[1] = 0xff;
2470 esp_write(eregs
->esp_tclow
, 2);
2471 esp_write(eregs
->esp_tcmed
, 0);
2472 esp
->dma_init_read(esp
, esp
->esp_command_dvma
, 2);
2473 thecmd
|= ESP_CMD_DMA
;
2474 esp_cmd(esp
, eregs
, thecmd
);
2475 esp_advance_phase(esp
->current_SC
, in_status
);
2478 return esp_do_status(esp
, eregs
);
2481 static int esp_disconnect_amidst_phases(struct NCR_ESP
*esp
,
2482 struct ESP_regs
*eregs
)
2484 Scsi_Cmnd
*sp
= esp
->current_SC
;
2485 Scsi_Device
*dp
= sp
->device
;
2487 /* This means real problems if we see this
2488 * here. Unless we were actually trying
2489 * to force the device to abort/reset.
2491 ESPLOG(("esp%d: Disconnect amidst phases, ", esp
->esp_id
));
2492 ESPLOG(("pphase<%s> cphase<%s>, ",
2493 phase_string(sp
->SCp
.phase
),
2494 phase_string(sp
->SCp
.sent_command
)));
2496 if(esp
->disconnected_SC
)
2497 esp_cmd(esp
, eregs
, ESP_CMD_ESEL
);
2499 switch(esp
->cur_msgout
[0]) {
2501 /* We didn't expect this to happen at all. */
2502 ESPLOG(("device is bolixed\n"));
2503 esp_advance_phase(sp
, in_tgterror
);
2504 esp_done(esp
, (DID_ERROR
<< 16));
2507 case BUS_DEVICE_RESET
:
2508 ESPLOG(("device reset successful\n"));
2509 dp
->sync_max_offset
= 0;
2510 dp
->sync_min_period
= 0;
2512 esp_advance_phase(sp
, in_resetdev
);
2513 esp_done(esp
, (DID_RESET
<< 16));
2517 ESPLOG(("device abort successful\n"));
2518 esp_advance_phase(sp
, in_abortone
);
2519 esp_done(esp
, (DID_ABORT
<< 16));
2526 static int esp_enter_msgout(struct NCR_ESP
*esp
,
2527 struct ESP_regs
*eregs
)
2529 esp_advance_phase(esp
->current_SC
, in_msgout
);
2530 return esp_do_msgout(esp
, eregs
);
2533 static int esp_enter_msgin(struct NCR_ESP
*esp
,
2534 struct ESP_regs
*eregs
)
2536 esp_advance_phase(esp
->current_SC
, in_msgin
);
2537 return esp_do_msgin(esp
, eregs
);
2540 static int esp_enter_cmd(struct NCR_ESP
*esp
,
2541 struct ESP_regs
*eregs
)
2543 esp_advance_phase(esp
->current_SC
, in_cmdbegin
);
2544 return esp_do_cmdbegin(esp
, eregs
);
2547 static int esp_enter_badphase(struct NCR_ESP
*esp
,
2548 struct ESP_regs
*eregs
)
2550 ESPLOG(("esp%d: Bizarre bus phase %2x.\n", esp
->esp_id
,
2551 esp
->sreg
& ESP_STAT_PMASK
));
2552 return do_reset_bus
;
2555 typedef int (*espfunc_t
)(struct NCR_ESP
*,
2558 static espfunc_t phase_vector
[] = {
2559 esp_do_data
, /* ESP_DOP */
2560 esp_do_data
, /* ESP_DIP */
2561 esp_enter_cmd
, /* ESP_CMDP */
2562 esp_enter_status
, /* ESP_STATP */
2563 esp_enter_badphase
, /* ESP_STAT_PMSG */
2564 esp_enter_badphase
, /* ESP_STAT_PMSG | ESP_STAT_PIO */
2565 esp_enter_msgout
, /* ESP_MOP */
2566 esp_enter_msgin
, /* ESP_MIP */
2569 /* The target has control of the bus and we have to see where it has
2572 static int esp_do_phase_determine(struct NCR_ESP
*esp
,
2573 struct ESP_regs
*eregs
)
2575 if ((esp
->ireg
& ESP_INTR_DC
) != 0)
2576 return esp_disconnect_amidst_phases(esp
, eregs
);
2577 return phase_vector
[esp
->sreg
& ESP_STAT_PMASK
](esp
, eregs
);
2580 /* First interrupt after exec'ing a cmd comes here. */
2581 static int esp_select_complete(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
2583 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
2584 Scsi_Device
*SDptr
= SCptr
->device
;
2585 int cmd_bytes_sent
, fcnt
;
2587 fcnt
= (esp_read(eregs
->esp_fflags
) & ESP_FF_FBYTES
);
2588 cmd_bytes_sent
= esp
->dma_bytes_sent(esp
, fcnt
);
2589 if(esp
->dma_invalidate
)
2590 esp
->dma_invalidate(esp
);
2592 /* Let's check to see if a reselect happened
2593 * while we we're trying to select. This must
2596 if(esp
->ireg
== (ESP_INTR_RSEL
| ESP_INTR_FDONE
)) {
2597 esp_reconnect(esp
, SCptr
);
2598 return esp_do_reconnect(esp
, eregs
);
2601 /* Looks like things worked, we should see a bus service &
2602 * a function complete interrupt at this point. Note we
2603 * are doing a direct comparison because we don't want to
2604 * be fooled into thinking selection was successful if
2605 * ESP_INTR_DC is set, see below.
2607 if(esp
->ireg
== (ESP_INTR_FDONE
| ESP_INTR_BSERV
)) {
2608 /* target speaks... */
2609 esp
->targets_present
|= (1<<SCptr
->target
);
2611 /* What if the target ignores the sdtr? */
2615 /* See how far, if at all, we got in getting
2616 * the information out to the target.
2618 switch(esp
->seqreg
) {
2622 /* Arbitration won, target selected, but
2623 * we are in some phase which is not command
2624 * phase nor is it message out phase.
2626 * XXX We've confused the target, obviously.
2627 * XXX So clear it's state, but we also end
2628 * XXX up clearing everyone elses. That isn't
2629 * XXX so nice. I'd like to just reset this
2630 * XXX target, but if I cannot even get it's
2631 * XXX attention and finish selection to talk
2632 * XXX to it, there is not much more I can do.
2633 * XXX If we have a loaded bus we're going to
2634 * XXX spend the next second or so renegotiating
2635 * XXX for synchronous transfers.
2637 ESPLOG(("esp%d: STEP_ASEL for tgt %d\n",
2638 esp
->esp_id
, SCptr
->target
));
2641 /* Arbitration won, target selected, went
2642 * to message out phase, sent one message
2643 * byte, then we stopped. ATN is asserted
2644 * on the SCSI bus and the target is still
2645 * there hanging on. This is a legal
2646 * sequence step if we gave the ESP a select
2649 * XXX See above, I could set the borken flag
2650 * XXX in the device struct and retry the
2651 * XXX command. But would that help for
2652 * XXX tagged capable targets?
2656 /* Arbitration won, target selected, maybe
2657 * sent the one message byte in message out
2658 * phase, but we did not go to command phase
2659 * in the end. Actually, we could have sent
2660 * only some of the message bytes if we tried
2661 * to send out the entire identify and tag
2662 * message using ESP_CMD_SA3.
2668 /* No, not the powerPC pinhead. Arbitration
2669 * won, all message bytes sent if we went to
2670 * message out phase, went to command phase
2671 * but only part of the command was sent.
2673 * XXX I've seen this, but usually in conjunction
2674 * XXX with a gross error which appears to have
2675 * XXX occurred between the time I told the
2676 * XXX ESP to arbitrate and when I got the
2677 * XXX interrupt. Could I have misloaded the
2678 * XXX command bytes into the fifo? Actually,
2679 * XXX I most likely missed a phase, and therefore
2680 * XXX went into never never land and didn't even
2681 * XXX know it. That was the old driver though.
2682 * XXX What is even more peculiar is that the ESP
2683 * XXX showed the proper function complete and
2684 * XXX bus service bits in the interrupt register.
2687 case ESP_STEP_FINI4
:
2688 case ESP_STEP_FINI5
:
2689 case ESP_STEP_FINI6
:
2690 case ESP_STEP_FINI7
:
2691 /* Account for the identify message */
2692 if(SCptr
->SCp
.phase
== in_slct_norm
)
2693 cmd_bytes_sent
-= 1;
2695 esp_cmd(esp
, eregs
, ESP_CMD_NULL
);
2697 /* Be careful, we could really get fucked during synchronous
2698 * data transfers if we try to flush the fifo now.
2700 if(!fcnt
&& /* Fifo is empty and... */
2701 /* either we are not doing synchronous transfers or... */
2702 (!SDptr
->sync_max_offset
||
2703 /* We are not going into data in phase. */
2704 ((esp
->sreg
& ESP_STAT_PMASK
) != ESP_DIP
)))
2705 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
); /* flush is safe */
2707 /* See how far we got if this is not a slow command. */
2708 if(!esp
->esp_slowcmd
) {
2709 if(cmd_bytes_sent
< 0)
2711 if(cmd_bytes_sent
!= SCptr
->cmd_len
) {
2712 /* Crapola, mark it as a slowcmd
2713 * so that we have some chance of
2714 * keeping the command alive with
2717 * XXX Actually, if we didn't send it all
2718 * XXX this means either we didn't set things
2719 * XXX up properly (driver bug) or the target
2720 * XXX or the ESP detected parity on one of
2721 * XXX the command bytes. This makes much
2722 * XXX more sense, and therefore this code
2723 * XXX should be changed to send out a
2724 * XXX parity error message or if the status
2725 * XXX register shows no parity error then
2726 * XXX just expect the target to bring the
2727 * XXX bus into message in phase so that it
2728 * XXX can send us the parity error message.
2731 esp
->esp_slowcmd
= 1;
2732 esp
->esp_scmdp
= &(SCptr
->cmnd
[cmd_bytes_sent
]);
2733 esp
->esp_scmdleft
= (SCptr
->cmd_len
- cmd_bytes_sent
);
2737 /* Now figure out where we went. */
2738 esp_advance_phase(SCptr
, in_the_dark
);
2739 return esp_do_phase_determine(esp
, eregs
);
2742 /* Did the target even make it? */
2743 if(esp
->ireg
== ESP_INTR_DC
) {
2744 /* wheee... nobody there or they didn't like
2745 * what we told it to do, clean up.
2748 /* If anyone is off the bus, but working on
2749 * a command in the background for us, tell
2750 * the ESP to listen for them.
2752 if(esp
->disconnected_SC
)
2753 esp_cmd(esp
, eregs
, ESP_CMD_ESEL
);
2755 if(((1<<SCptr
->target
) & esp
->targets_present
) &&
2756 esp
->seqreg
&& esp
->cur_msgout
[0] == EXTENDED_MESSAGE
&&
2757 (SCptr
->SCp
.phase
== in_slct_msg
||
2758 SCptr
->SCp
.phase
== in_slct_stop
)) {
2761 ESPLOG(("esp%d: Failed synchronous negotiation for target %d "
2762 "lun %d\n", esp
->esp_id
, SCptr
->target
, SCptr
->lun
));
2763 SDptr
->sync_max_offset
= 0;
2764 SDptr
->sync_min_period
= 0;
2765 SDptr
->sync
= 1; /* so we don't negotiate again */
2767 /* Run the command again, this time though we
2768 * won't try to negotiate for synchronous transfers.
2770 * XXX I'd like to do something like send an
2771 * XXX INITIATOR_ERROR or ABORT message to the
2772 * XXX target to tell it, "Sorry I confused you,
2773 * XXX please come back and I will be nicer next
2774 * XXX time". But that requires having the target
2775 * XXX on the bus, and it has dropped BSY on us.
2777 esp
->current_SC
= NULL
;
2778 esp_advance_phase(SCptr
, not_issued
);
2779 prepend_SC(&esp
->issue_SC
, SCptr
);
2784 /* Ok, this is normal, this is what we see during boot
2785 * or whenever when we are scanning the bus for targets.
2786 * But first make sure that is really what is happening.
2788 if(((1<<SCptr
->target
) & esp
->targets_present
)) {
2789 ESPLOG(("esp%d: Warning, live target %d not responding to "
2790 "selection.\n", esp
->esp_id
, SCptr
->target
));
2792 /* This _CAN_ happen. The SCSI standard states that
2793 * the target is to _not_ respond to selection if
2794 * _it_ detects bad parity on the bus for any reason.
2795 * Therefore, we assume that if we've talked successfully
2796 * to this target before, bad parity is the problem.
2798 esp_done(esp
, (DID_PARITY
<< 16));
2800 /* Else, there really isn't anyone there. */
2801 ESPMISC(("esp: selection failure, maybe nobody there?\n"));
2802 ESPMISC(("esp: target %d lun %d\n",
2803 SCptr
->target
, SCptr
->lun
));
2804 esp_done(esp
, (DID_BAD_TARGET
<< 16));
2810 ESPLOG(("esp%d: Selection failure.\n", esp
->esp_id
));
2811 printk("esp%d: Currently -- ", esp
->esp_id
);
2812 esp_print_ireg(esp
->ireg
);
2814 esp_print_statreg(esp
->sreg
);
2816 esp_print_seqreg(esp
->seqreg
);
2818 printk("esp%d: New -- ", esp
->esp_id
);
2819 esp
->sreg
= esp_read(eregs
->esp_status
);
2820 esp
->seqreg
= esp_read(eregs
->esp_sstep
);
2821 esp
->ireg
= esp_read(eregs
->esp_intrpt
);
2822 esp_print_ireg(esp
->ireg
);
2824 esp_print_statreg(esp
->sreg
);
2826 esp_print_seqreg(esp
->seqreg
);
2828 ESPLOG(("esp%d: resetting bus\n", esp
->esp_id
));
2829 return do_reset_bus
; /* ugh... */
2832 /* Continue reading bytes for msgin phase. */
2833 static int esp_do_msgincont(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
2835 if(esp
->ireg
& ESP_INTR_BSERV
) {
2836 /* in the right phase too? */
2837 if((esp
->sreg
& ESP_STAT_PMASK
) == ESP_MIP
) {
2839 esp_cmd(esp
, eregs
, ESP_CMD_TI
);
2840 esp_advance_phase(esp
->current_SC
, in_msgindone
);
2844 /* We changed phase but ESP shows bus service,
2845 * in this case it is most likely that we, the
2846 * hacker who has been up for 20hrs straight
2847 * staring at the screen, drowned in coffee
2848 * smelling like retched cigarette ashes
2849 * have miscoded something..... so, try to
2850 * recover as best we can.
2852 ESPLOG(("esp%d: message in mis-carriage.\n", esp
->esp_id
));
2854 esp_advance_phase(esp
->current_SC
, in_the_dark
);
2855 return do_phase_determine
;
2858 static int check_singlebyte_msg(struct NCR_ESP
*esp
,
2859 struct ESP_regs
*eregs
)
2861 esp
->prevmsgin
= esp
->cur_msgin
[0];
2862 if(esp
->cur_msgin
[0] & 0x80) {
2864 ESPLOG(("esp%d: target sends identify amidst phases\n",
2866 esp_advance_phase(esp
->current_SC
, in_the_dark
);
2868 } else if(((esp
->cur_msgin
[0] & 0xf0) == 0x20) ||
2869 (esp
->cur_msgin
[0] == EXTENDED_MESSAGE
)) {
2871 esp_advance_phase(esp
->current_SC
, in_msgincont
);
2874 esp_advance_phase(esp
->current_SC
, in_the_dark
);
2875 switch(esp
->cur_msgin
[0]) {
2877 /* We don't want to hear about it. */
2878 ESPLOG(("esp%d: msg %02x which we don't know about\n", esp
->esp_id
,
2879 esp
->cur_msgin
[0]));
2880 return MESSAGE_REJECT
;
2883 ESPLOG(("esp%d: target %d sends a nop\n", esp
->esp_id
,
2884 esp
->current_SC
->target
));
2887 case RESTORE_POINTERS
:
2888 /* In this case we might also have to backup the
2889 * "slow command" pointer. It is rare to get such
2890 * a save/restore pointer sequence so early in the
2891 * bus transition sequences, but cover it.
2893 if(esp
->esp_slowcmd
) {
2894 esp
->esp_scmdleft
= esp
->current_SC
->cmd_len
;
2895 esp
->esp_scmdp
= &esp
->current_SC
->cmnd
[0];
2897 esp_restore_pointers(esp
, esp
->current_SC
);
2901 esp_save_pointers(esp
, esp
->current_SC
);
2904 case COMMAND_COMPLETE
:
2906 /* Freeing the bus, let it go. */
2907 esp
->current_SC
->SCp
.phase
= in_freeing
;
2910 case MESSAGE_REJECT
:
2911 ESPMISC(("msg reject, "));
2912 if(esp
->prevmsgout
== EXTENDED_MESSAGE
) {
2913 Scsi_Device
*SDptr
= esp
->current_SC
->device
;
2915 /* Doesn't look like this target can
2916 * do synchronous or WIDE transfers.
2918 ESPSDTR(("got reject, was trying nego, clearing sync/WIDE\n"));
2921 SDptr
->sync_min_period
= 0;
2922 SDptr
->sync_max_offset
= 0;
2925 ESPMISC(("not sync nego, sending ABORT\n"));
2931 /* Target negotiates for synchronous transfers before we do, this
2932 * is legal although very strange. What is even funnier is that
2933 * the SCSI2 standard specifically recommends against targets doing
2934 * this because so many initiators cannot cope with this occuring.
2936 static int target_with_ants_in_pants(struct NCR_ESP
*esp
,
2940 if(SDptr
->sync
|| SDptr
->borken
) {
2941 /* sorry, no can do */
2942 ESPSDTR(("forcing to async, "));
2943 build_sync_nego_msg(esp
, 0, 0);
2946 ESPLOG(("esp%d: hoping for msgout\n", esp
->esp_id
));
2947 esp_advance_phase(SCptr
, in_the_dark
);
2948 return EXTENDED_MESSAGE
;
2951 /* Ok, we'll check them out... */
2955 static void sync_report(struct NCR_ESP
*esp
)
2960 msg3
= esp
->cur_msgin
[3];
2961 msg4
= esp
->cur_msgin
[4];
2963 int hz
= 1000000000 / (msg3
* 4);
2964 int integer
= hz
/ 1000000;
2965 int fraction
= (hz
- (integer
* 1000000)) / 10000;
2966 if((msg3
* 4) < 200) {
2969 type
= "synchronous";
2972 /* Do not transform this back into one big printk
2973 * again, it triggers a bug in our sparc64-gcc272
2974 * sibling call optimization. -DaveM
2976 ESPLOG((KERN_INFO
"esp%d: target %d ",
2977 esp
->esp_id
, esp
->current_SC
->target
));
2978 ESPLOG(("[period %dns offset %d %d.%02dMHz ",
2979 (int) msg3
* 4, (int) msg4
,
2980 integer
, fraction
));
2981 ESPLOG(("%s SCSI%s]\n", type
,
2982 (((msg3
* 4) < 200) ? "-II" : "")));
2984 ESPLOG((KERN_INFO
"esp%d: target %d asynchronous\n",
2985 esp
->esp_id
, esp
->current_SC
->target
));
2989 static int check_multibyte_msg(struct NCR_ESP
*esp
,
2990 struct ESP_regs
*eregs
)
2992 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
2993 Scsi_Device
*SDptr
= SCptr
->device
;
2995 int message_out
= 0;
2997 ESPSDTR(("chk multibyte msg: "));
2998 if(esp
->cur_msgin
[2] == EXTENDED_SDTR
) {
2999 int period
= esp
->cur_msgin
[3];
3000 int offset
= esp
->cur_msgin
[4];
3002 ESPSDTR(("is sync nego response, "));
3006 /* Target negotiates first! */
3007 ESPSDTR(("target jumps the gun, "));
3008 message_out
= EXTENDED_MESSAGE
; /* we must respond */
3009 rval
= target_with_ants_in_pants(esp
, SCptr
, SDptr
);
3014 ESPSDTR(("examining sdtr, "));
3016 /* Offset cannot be larger than ESP fifo size. */
3018 ESPSDTR(("offset too big %2x, ", offset
));
3020 ESPSDTR(("sending back new offset\n"));
3021 build_sync_nego_msg(esp
, period
, offset
);
3022 return EXTENDED_MESSAGE
;
3025 if(offset
&& period
> esp
->max_period
) {
3026 /* Yeee, async for this slow device. */
3027 ESPSDTR(("period too long %2x, ", period
));
3028 build_sync_nego_msg(esp
, 0, 0);
3029 ESPSDTR(("hoping for msgout\n"));
3030 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3031 return EXTENDED_MESSAGE
;
3032 } else if (offset
&& period
< esp
->min_period
) {
3033 ESPSDTR(("period too short %2x, ", period
));
3034 period
= esp
->min_period
;
3035 if(esp
->erev
> esp236
)
3042 ESPSDTR(("period is ok, "));
3043 tmp
= esp
->ccycle
/ 1000;
3044 regval
= (((period
<< 2) + tmp
- 1) / tmp
);
3045 if(regval
&& (esp
->erev
> esp236
)) {
3054 SDptr
->sync_min_period
= (regval
& 0x1f);
3055 SDptr
->sync_max_offset
= (offset
| esp
->radelay
);
3056 if(esp
->erev
> esp236
) {
3057 if(esp
->erev
== fas100a
)
3058 bit
= ESP_CONFIG3_FAST
;
3060 bit
= ESP_CONFIG3_FSCSI
;
3062 esp
->config3
[SCptr
->target
] |= bit
;
3064 esp
->config3
[SCptr
->target
] &= ~bit
;
3065 esp
->prev_cfg3
= esp
->config3
[SCptr
->target
];
3066 esp_write(eregs
->esp_cfg3
, esp
->prev_cfg3
);
3068 esp
->prev_soff
= SDptr
->sync_min_period
;
3069 esp_write(eregs
->esp_soff
, esp
->prev_soff
);
3070 esp
->prev_stp
= SDptr
->sync_max_offset
;
3071 esp_write(eregs
->esp_stp
, esp
->prev_stp
);
3073 ESPSDTR(("soff=%2x stp=%2x cfg3=%2x\n",
3074 SDptr
->sync_max_offset
,
3075 SDptr
->sync_min_period
,
3076 esp
->config3
[SCptr
->target
]));
3079 } else if(SDptr
->sync_max_offset
) {
3082 /* back to async mode */
3083 ESPSDTR(("unaccaptable sync nego, forcing async\n"));
3084 SDptr
->sync_max_offset
= 0;
3085 SDptr
->sync_min_period
= 0;
3087 esp_write(eregs
->esp_soff
, 0);
3089 esp_write(eregs
->esp_stp
, 0);
3090 if(esp
->erev
> esp236
) {
3091 if(esp
->erev
== fas100a
)
3092 bit
= ESP_CONFIG3_FAST
;
3094 bit
= ESP_CONFIG3_FSCSI
;
3095 esp
->config3
[SCptr
->target
] &= ~bit
;
3096 esp
->prev_cfg3
= esp
->config3
[SCptr
->target
];
3097 esp_write(eregs
->esp_cfg3
, esp
->prev_cfg3
);
3103 ESPSDTR(("chk multibyte msg: sync is known, "));
3107 ESPLOG(("esp%d: sending sdtr back, hoping for msgout\n",
3109 build_sync_nego_msg(esp
, period
, offset
);
3110 esp_advance_phase(SCptr
, in_the_dark
);
3111 return EXTENDED_MESSAGE
;
3114 ESPSDTR(("returning zero\n"));
3115 esp_advance_phase(SCptr
, in_the_dark
); /* ...or else! */
3117 } else if(esp
->cur_msgin
[2] == EXTENDED_WDTR
) {
3118 ESPLOG(("esp%d: AIEEE wide msg received\n", esp
->esp_id
));
3119 message_out
= MESSAGE_REJECT
;
3120 } else if(esp
->cur_msgin
[2] == EXTENDED_MODIFY_DATA_POINTER
) {
3121 ESPLOG(("esp%d: rejecting modify data ptr msg\n", esp
->esp_id
));
3122 message_out
= MESSAGE_REJECT
;
3124 esp_advance_phase(SCptr
, in_the_dark
);
3128 static int esp_do_msgindone(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
3130 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
3131 int message_out
= 0, it
= 0, rval
;
3133 rval
= skipahead1(esp
, eregs
, SCptr
, in_msgin
, in_msgindone
);
3136 if(SCptr
->SCp
.sent_command
!= in_status
) {
3137 if(!(esp
->ireg
& ESP_INTR_DC
)) {
3138 if(esp
->msgin_len
&& (esp
->sreg
& ESP_STAT_PERR
)) {
3139 message_out
= MSG_PARITY_ERROR
;
3140 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
3141 } else if((it
= (esp_read(eregs
->esp_fflags
) & ESP_FF_FBYTES
))!=1) {
3142 /* We certainly dropped the ball somewhere. */
3143 message_out
= INITIATOR_ERROR
;
3144 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
3145 } else if(!esp
->msgin_len
) {
3146 it
= esp_read(eregs
->esp_fdata
);
3147 esp_advance_phase(SCptr
, in_msgincont
);
3149 /* it is ok and we want it */
3150 it
= esp
->cur_msgin
[esp
->msgin_ctr
] =
3151 esp_read(eregs
->esp_fdata
);
3155 esp_advance_phase(SCptr
, in_the_dark
);
3159 it
= esp
->cur_msgin
[0];
3161 if(!message_out
&& esp
->msgin_len
) {
3162 if(esp
->msgin_ctr
< esp
->msgin_len
) {
3163 esp_advance_phase(SCptr
, in_msgincont
);
3164 } else if(esp
->msgin_len
== 1) {
3165 message_out
= check_singlebyte_msg(esp
, eregs
);
3166 } else if(esp
->msgin_len
== 2) {
3167 if(esp
->cur_msgin
[0] == EXTENDED_MESSAGE
) {
3169 message_out
= MESSAGE_REJECT
;
3171 esp
->msgin_len
= (it
+ 2);
3172 esp_advance_phase(SCptr
, in_msgincont
);
3175 message_out
= MESSAGE_REJECT
; /* foo on you */
3178 message_out
= check_multibyte_msg(esp
, eregs
);
3181 if(message_out
< 0) {
3182 return -message_out
;
3183 } else if(message_out
) {
3184 if(((message_out
!= 1) &&
3185 ((message_out
< 0x20) || (message_out
& 0x80))))
3186 esp
->msgout_len
= 1;
3187 esp
->cur_msgout
[0] = message_out
;
3188 esp_cmd(esp
, eregs
, ESP_CMD_SATN
);
3189 esp_advance_phase(SCptr
, in_the_dark
);
3192 esp
->sreg
= esp_read(eregs
->esp_status
);
3193 esp
->sreg
&= ~(ESP_STAT_INTR
);
3194 if((esp
->sreg
& (ESP_STAT_PMSG
|ESP_STAT_PCD
)) == (ESP_STAT_PMSG
|ESP_STAT_PCD
))
3195 esp_cmd(esp
, eregs
, ESP_CMD_MOK
);
3196 if((SCptr
->SCp
.sent_command
== in_msgindone
) &&
3197 (SCptr
->SCp
.phase
== in_freeing
))
3198 return esp_do_freebus(esp
, eregs
);
3202 static int esp_do_cmdbegin(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
3205 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
3207 esp_advance_phase(SCptr
, in_cmdend
);
3208 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
3209 tmp
= *esp
->esp_scmdp
++;
3210 esp
->esp_scmdleft
--;
3211 esp_write(eregs
->esp_fdata
, tmp
);
3212 esp_cmd(esp
, eregs
, ESP_CMD_TI
);
3216 static int esp_do_cmddone(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
3218 esp_cmd(esp
, eregs
, ESP_CMD_NULL
);
3219 if(esp
->ireg
& ESP_INTR_BSERV
) {
3220 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3221 return esp_do_phase_determine(esp
, eregs
);
3223 ESPLOG(("esp%d: in do_cmddone() but didn't get BSERV interrupt.\n",
3225 return do_reset_bus
;
3228 static int esp_do_msgout(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
3230 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
3231 switch(esp
->msgout_len
) {
3233 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[0]);
3234 esp_cmd(esp
, eregs
, ESP_CMD_TI
);
3238 if(esp
->do_pio_cmds
){
3239 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[0]);
3240 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[1]);
3241 esp_cmd(esp
, eregs
, ESP_CMD_TI
);
3243 esp
->esp_command
[0] = esp
->cur_msgout
[0];
3244 esp
->esp_command
[1] = esp
->cur_msgout
[1];
3245 esp
->dma_setup(esp
, esp
->esp_command_dvma
, 2, 0);
3246 esp_setcount(eregs
, 2);
3247 esp_cmd(esp
, eregs
, ESP_CMD_DMA
| ESP_CMD_TI
);
3253 if(esp
->do_pio_cmds
){
3254 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[0]);
3255 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[1]);
3256 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[2]);
3257 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[3]);
3258 esp_cmd(esp
, eregs
, ESP_CMD_TI
);
3260 esp
->esp_command
[0] = esp
->cur_msgout
[0];
3261 esp
->esp_command
[1] = esp
->cur_msgout
[1];
3262 esp
->esp_command
[2] = esp
->cur_msgout
[2];
3263 esp
->esp_command
[3] = esp
->cur_msgout
[3];
3264 esp
->dma_setup(esp
, esp
->esp_command_dvma
, 4, 0);
3265 esp_setcount(eregs
, 4);
3266 esp_cmd(esp
, eregs
, ESP_CMD_DMA
| ESP_CMD_TI
);
3272 if(esp
->do_pio_cmds
){
3273 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[0]);
3274 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[1]);
3275 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[2]);
3276 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[3]);
3277 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[4]);
3278 esp_cmd(esp
, eregs
, ESP_CMD_TI
);
3280 esp
->esp_command
[0] = esp
->cur_msgout
[0];
3281 esp
->esp_command
[1] = esp
->cur_msgout
[1];
3282 esp
->esp_command
[2] = esp
->cur_msgout
[2];
3283 esp
->esp_command
[3] = esp
->cur_msgout
[3];
3284 esp
->esp_command
[4] = esp
->cur_msgout
[4];
3285 esp
->dma_setup(esp
, esp
->esp_command_dvma
, 5, 0);
3286 esp_setcount(eregs
, 5);
3287 esp_cmd(esp
, eregs
, ESP_CMD_DMA
| ESP_CMD_TI
);
3293 ESPMISC(("bogus msgout sending NOP\n"));
3294 esp
->cur_msgout
[0] = NOP
;
3295 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[0]);
3296 esp
->msgout_len
= 1;
3297 esp_cmd(esp
, eregs
, ESP_CMD_TI
);
3300 esp_advance_phase(esp
->current_SC
, in_msgoutdone
);
3304 static int esp_do_msgoutdone(struct NCR_ESP
*esp
,
3305 struct ESP_regs
*eregs
)
3307 if((esp
->msgout_len
> 1) && esp
->dma_barrier
)
3308 esp
->dma_barrier(esp
);
3310 if(!(esp
->ireg
& ESP_INTR_DC
)) {
3311 esp_cmd(esp
, eregs
, ESP_CMD_NULL
);
3312 switch(esp
->sreg
& ESP_STAT_PMASK
) {
3314 /* whoops, parity error */
3315 ESPLOG(("esp%d: still in msgout, parity error assumed\n",
3317 if(esp
->msgout_len
> 1)
3318 esp_cmd(esp
, eregs
, ESP_CMD_SATN
);
3319 esp_advance_phase(esp
->current_SC
, in_msgout
);
3326 if(!fcount(esp
, eregs
) &&
3327 !(esp
->current_SC
->device
->sync_max_offset
))
3328 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
3334 /* If we sent out a synchronous negotiation message, update
3337 if(esp
->cur_msgout
[2] == EXTENDED_MESSAGE
&&
3338 esp
->cur_msgout
[4] == EXTENDED_SDTR
) {
3339 esp
->snip
= 1; /* anal retentiveness... */
3342 esp
->prevmsgout
= esp
->cur_msgout
[0];
3343 esp
->msgout_len
= 0;
3344 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3345 return esp_do_phase_determine(esp
, eregs
);
3348 static int esp_bus_unexpected(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
3350 ESPLOG(("esp%d: command in weird state %2x\n",
3351 esp
->esp_id
, esp
->current_SC
->SCp
.phase
));
3352 return do_reset_bus
;
3355 static espfunc_t bus_vector
[] = {
3368 esp_do_phase_determine
,
3374 /* This is the second tier in our dual-level SCSI state machine. */
3375 static int esp_work_bus(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
3377 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
3380 ESPBUS(("esp_work_bus: "));
3382 ESPBUS(("reconnect\n"));
3383 return esp_do_reconnect(esp
, eregs
);
3385 phase
= SCptr
->SCp
.phase
;
3386 if ((phase
& 0xf0) == in_phases_mask
)
3387 return bus_vector
[(phase
& 0x0f)](esp
, eregs
);
3388 else if((phase
& 0xf0) == in_slct_mask
)
3389 return esp_select_complete(esp
, eregs
);
3391 return esp_bus_unexpected(esp
, eregs
);
3394 static espfunc_t isvc_vector
[] = {
3396 esp_do_phase_determine
,
3402 /* Main interrupt handler for an esp adapter. */
3403 void esp_handle(struct NCR_ESP
*esp
)
3405 struct ESP_regs
*eregs
;
3407 int what_next
= do_intr_end
;
3409 SCptr
= esp
->current_SC
;
3411 if(esp
->dma_irq_entry
)
3412 esp
->dma_irq_entry(esp
);
3414 /* Check for errors. */
3415 esp
->sreg
= esp_read(eregs
->esp_status
);
3416 esp
->sreg
&= (~ESP_STAT_INTR
);
3417 esp
->seqreg
= (esp_read(eregs
->esp_sstep
) & ESP_STEP_VBITS
);
3418 esp
->ireg
= esp_read(eregs
->esp_intrpt
); /* Unlatch intr and stat regs */
3419 ESPIRQ(("handle_irq: [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
3420 esp
->sreg
, esp
->seqreg
, esp
->ireg
));
3421 if(esp
->sreg
& (ESP_STAT_SPAM
)) {
3422 /* Gross error, could be due to one of:
3424 * - top of fifo overwritten, could be because
3425 * we tried to do a synchronous transfer with
3426 * an offset greater than ESP fifo size
3428 * - top of command register overwritten
3430 * - DMA setup to go in one direction, SCSI
3431 * bus points in the other, whoops
3433 * - weird phase change during asynchronous
3434 * data phase while we are initiator
3436 ESPLOG(("esp%d: Gross error sreg=%2x\n", esp
->esp_id
, esp
->sreg
));
3438 /* If a command is live on the bus we cannot safely
3439 * reset the bus, so we'll just let the pieces fall
3440 * where they may. Here we are hoping that the
3441 * target will be able to cleanly go away soon
3442 * so we can safely reset things.
3445 ESPLOG(("esp%d: No current cmd during gross error, "
3446 "resetting bus\n", esp
->esp_id
));
3447 what_next
= do_reset_bus
;
3452 /* No current cmd is only valid at this point when there are
3453 * commands off the bus or we are trying a reset.
3455 if(!SCptr
&& !esp
->disconnected_SC
&& !(esp
->ireg
& ESP_INTR_SR
)) {
3456 /* Panic is safe, since current_SC is null. */
3457 ESPLOG(("esp%d: no command in esp_handle()\n", esp
->esp_id
));
3458 panic("esp_handle: current_SC == penguin within interrupt!");
3461 if(esp
->ireg
& (ESP_INTR_IC
)) {
3462 /* Illegal command fed to ESP. Outside of obvious
3463 * software bugs that could cause this, there is
3464 * a condition with ESP100 where we can confuse the
3465 * ESP into an erroneous illegal command interrupt
3466 * because it does not scrape the FIFO properly
3467 * for reselection. See esp100_reconnect_hwbug()
3468 * to see how we try very hard to avoid this.
3470 ESPLOG(("esp%d: illegal command\n", esp
->esp_id
));
3472 esp_dump_state(esp
, eregs
);
3475 /* Devices with very buggy firmware can drop BSY
3476 * during a scatter list interrupt when using sync
3477 * mode transfers. We continue the transfer as
3478 * expected, the target drops the bus, the ESP
3479 * gets confused, and we get a illegal command
3480 * interrupt because the bus is in the disconnected
3481 * state now and ESP_CMD_TI is only allowed when
3482 * a nexus is alive on the bus.
3484 ESPLOG(("esp%d: Forcing async and disabling disconnect for "
3485 "target %d\n", esp
->esp_id
, SCptr
->target
));
3486 SCptr
->device
->borken
= 1; /* foo on you */
3489 what_next
= do_reset_bus
;
3490 } else if(!(esp
->ireg
& ~(ESP_INTR_FDONE
| ESP_INTR_BSERV
| ESP_INTR_DC
))) {
3494 phase
= SCptr
->SCp
.phase
;
3495 if(phase
& in_phases_mask
) {
3496 what_next
= esp_work_bus(esp
, eregs
);
3497 } else if(phase
& in_slct_mask
) {
3498 what_next
= esp_select_complete(esp
, eregs
);
3500 ESPLOG(("esp%d: interrupt for no good reason...\n",
3502 what_next
= do_intr_end
;
3505 ESPLOG(("esp%d: BSERV or FDONE or DC while SCptr==NULL\n",
3507 what_next
= do_reset_bus
;
3509 } else if(esp
->ireg
& ESP_INTR_SR
) {
3510 ESPLOG(("esp%d: SCSI bus reset interrupt\n", esp
->esp_id
));
3511 what_next
= do_reset_complete
;
3512 } else if(esp
->ireg
& (ESP_INTR_S
| ESP_INTR_SATN
)) {
3513 ESPLOG(("esp%d: AIEEE we have been selected by another initiator!\n",
3515 what_next
= do_reset_bus
;
3516 } else if(esp
->ireg
& ESP_INTR_RSEL
) {
3519 what_next
= esp_do_reconnect(esp
, eregs
);
3520 } else if(SCptr
->SCp
.phase
& in_slct_mask
) {
3521 /* Only selection code knows how to clean
3524 ESPDISC(("Reselected during selection attempt\n"));
3525 what_next
= esp_select_complete(esp
, eregs
);
3527 ESPLOG(("esp%d: Reselected while bus is busy\n",
3529 what_next
= do_reset_bus
;
3533 /* This is tier-one in our dual level SCSI state machine. */
3535 while(what_next
!= do_intr_end
) {
3536 if (what_next
>= do_phase_determine
&&
3537 what_next
< do_intr_end
)
3538 what_next
= isvc_vector
[what_next
](esp
, eregs
);
3540 /* state is completely lost ;-( */
3541 ESPLOG(("esp%d: interrupt engine loses state, resetting bus\n",
3543 what_next
= do_reset_bus
;
3546 if(esp
->dma_irq_exit
)
3547 esp
->dma_irq_exit(esp
);
3551 void esp_intr(int irq
, void *dev_id
, struct pt_regs
*pregs
)
3553 struct NCR_ESP
*esp
;
3554 unsigned long flags
;
3557 /* Handle all ESP interrupts showing at this IRQ level. */
3558 spin_lock_irqsave(&io_request_lock
, flags
);
3563 if(((esp
)->irq
& 0xff) == irq
) {
3565 if(esp
->dma_irq_p(esp
)) {
3568 esp
->dma_ints_off(esp
);
3570 ESPIRQ(("I%d(", esp
->esp_id
));
3574 esp
->dma_ints_on(esp
);
3582 spin_unlock_irqrestore(&io_request_lock
, flags
);
3585 /* For SMP we only service one ESP on the list list at our IRQ level! */
3586 static void esp_intr(int irq
, void *dev_id
, struct pt_regs
*pregs
)
3588 struct NCR_ESP
*esp
;
3589 unsigned long flags
;
3591 /* Handle all ESP interrupts showing at this IRQ level. */
3592 spin_lock_irqsave(&io_request_lock
, flags
);
3594 if(((esp
)->irq
& 0xf) == irq
) {
3595 if(esp
->dma_irq_p(esp
)) {
3596 esp
->dma_ints_off(esp
);
3598 ESPIRQ(("I[%d:%d](",
3599 smp_processor_id(), esp
->esp_id
));
3603 esp
->dma_ints_on(esp
);
3609 spin_unlock_irqrestore(&io_request_lock
, flags
);
3614 int init_module(void) { return 0; }
3615 void cleanup_module(void) {}
3616 void esp_release(void)
3620 esps_running
= esps_in_use
;