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.
24 #include <linux/module.h>
26 #include <linux/config.h>
27 #include <linux/kernel.h>
28 #include <linux/delay.h>
29 #include <linux/types.h>
30 #include <linux/string.h>
31 #include <linux/slab.h>
32 #include <linux/blkdev.h>
33 #include <linux/interrupt.h>
34 #include <linux/proc_fs.h>
35 #include <linux/stat.h>
36 #include <linux/init.h>
39 #include <scsi/scsi_host.h>
42 #include <asm/system.h>
43 #include <asm/ptrace.h>
44 #include <asm/pgtable.h>
48 /* Command phase enumeration. */
50 not_issued
= 0x00, /* Still in the issue_SC queue. */
52 /* Various forms of selecting a target. */
53 #define in_slct_mask 0x10
54 in_slct_norm
= 0x10, /* ESP is arbitrating, normal selection */
55 in_slct_stop
= 0x11, /* ESP will select, then stop with IRQ */
56 in_slct_msg
= 0x12, /* select, then send a message */
57 in_slct_tag
= 0x13, /* select and send tagged queue msg */
58 in_slct_sneg
= 0x14, /* select and acquire sync capabilities */
60 /* Any post selection activity. */
61 #define in_phases_mask 0x20
62 in_datain
= 0x20, /* Data is transferring from the bus */
63 in_dataout
= 0x21, /* Data is transferring to the bus */
64 in_data_done
= 0x22, /* Last DMA data operation done (maybe) */
65 in_msgin
= 0x23, /* Eating message from target */
66 in_msgincont
= 0x24, /* Eating more msg bytes from target */
67 in_msgindone
= 0x25, /* Decide what to do with what we got */
68 in_msgout
= 0x26, /* Sending message to target */
69 in_msgoutdone
= 0x27, /* Done sending msg out */
70 in_cmdbegin
= 0x28, /* Sending cmd after abnormal selection */
71 in_cmdend
= 0x29, /* Done sending slow cmd */
72 in_status
= 0x2a, /* Was in status phase, finishing cmd */
73 in_freeing
= 0x2b, /* freeing the bus for cmd cmplt or disc */
74 in_the_dark
= 0x2c, /* Don't know what bus phase we are in */
76 /* Special states, ie. not normal bus transitions... */
77 #define in_spec_mask 0x80
78 in_abortone
= 0x80, /* Aborting one command currently */
79 in_abortall
= 0x81, /* Blowing away all commands we have */
80 in_resetdev
= 0x82, /* SCSI target reset in progress */
81 in_resetbus
= 0x83, /* SCSI bus reset in progress */
82 in_tgterror
= 0x84, /* Target did something stupid */
86 /* Zero has special meaning, see skipahead[12]. */
89 /*1*/ do_phase_determine
,
91 /*3*/ do_reset_complete
,
96 /* The master ring of all esp hosts we are managing in this driver. */
97 struct NCR_ESP
*espchain
;
98 int nesps
= 0, esps_in_use
= 0, esps_running
= 0;
100 irqreturn_t
esp_intr(int irq
, void *dev_id
, struct pt_regs
*pregs
);
102 /* Debugging routines */
103 struct esp_cmdstrings
{
106 } esp_cmd_strings
[] = {
108 { ESP_CMD_NULL
, "ESP_NOP", },
109 { ESP_CMD_FLUSH
, "FIFO_FLUSH", },
110 { ESP_CMD_RC
, "RSTESP", },
111 { ESP_CMD_RS
, "RSTSCSI", },
112 /* Disconnected State Group */
113 { ESP_CMD_RSEL
, "RESLCTSEQ", },
114 { ESP_CMD_SEL
, "SLCTNATN", },
115 { ESP_CMD_SELA
, "SLCTATN", },
116 { ESP_CMD_SELAS
, "SLCTATNSTOP", },
117 { ESP_CMD_ESEL
, "ENSLCTRESEL", },
118 { ESP_CMD_DSEL
, "DISSELRESEL", },
119 { ESP_CMD_SA3
, "SLCTATN3", },
120 { ESP_CMD_RSEL3
, "RESLCTSEQ", },
121 /* Target State Group */
122 { ESP_CMD_SMSG
, "SNDMSG", },
123 { ESP_CMD_SSTAT
, "SNDSTATUS", },
124 { ESP_CMD_SDATA
, "SNDDATA", },
125 { ESP_CMD_DSEQ
, "DISCSEQ", },
126 { ESP_CMD_TSEQ
, "TERMSEQ", },
127 { ESP_CMD_TCCSEQ
, "TRGTCMDCOMPSEQ", },
128 { ESP_CMD_DCNCT
, "DISC", },
129 { ESP_CMD_RMSG
, "RCVMSG", },
130 { ESP_CMD_RCMD
, "RCVCMD", },
131 { ESP_CMD_RDATA
, "RCVDATA", },
132 { ESP_CMD_RCSEQ
, "RCVCMDSEQ", },
133 /* Initiator State Group */
134 { ESP_CMD_TI
, "TRANSINFO", },
135 { ESP_CMD_ICCSEQ
, "INICMDSEQCOMP", },
136 { ESP_CMD_MOK
, "MSGACCEPTED", },
137 { ESP_CMD_TPAD
, "TPAD", },
138 { ESP_CMD_SATN
, "SATN", },
139 { ESP_CMD_RATN
, "RATN", },
141 #define NUM_ESP_COMMANDS ((sizeof(esp_cmd_strings)) / (sizeof(struct esp_cmdstrings)))
143 /* Print textual representation of an ESP command */
144 static inline void esp_print_cmd(unchar espcmd
)
146 unchar dma_bit
= espcmd
& ESP_CMD_DMA
;
150 for(i
=0; i
<NUM_ESP_COMMANDS
; i
++)
151 if(esp_cmd_strings
[i
].cmdchar
== espcmd
)
153 if(i
==NUM_ESP_COMMANDS
)
154 printk("ESP_Unknown");
156 printk("%s%s", esp_cmd_strings
[i
].text
,
157 ((dma_bit
) ? "+DMA" : ""));
160 /* Print the status register's value */
161 static inline void esp_print_statreg(unchar statreg
)
166 phase
= statreg
& ESP_STAT_PMASK
;
167 printk("%s,", (phase
== ESP_DOP
? "DATA-OUT" :
168 (phase
== ESP_DIP
? "DATA-IN" :
169 (phase
== ESP_CMDP
? "COMMAND" :
170 (phase
== ESP_STATP
? "STATUS" :
171 (phase
== ESP_MOP
? "MSG-OUT" :
172 (phase
== ESP_MIP
? "MSG_IN" :
174 if(statreg
& ESP_STAT_TDONE
)
175 printk("TRANS_DONE,");
176 if(statreg
& ESP_STAT_TCNT
)
177 printk("TCOUNT_ZERO,");
178 if(statreg
& ESP_STAT_PERR
)
180 if(statreg
& ESP_STAT_SPAM
)
182 if(statreg
& ESP_STAT_INTR
)
187 /* Print the interrupt register's value */
188 static inline void esp_print_ireg(unchar intreg
)
191 if(intreg
& ESP_INTR_S
)
192 printk("SLCT_NATN ");
193 if(intreg
& ESP_INTR_SATN
)
195 if(intreg
& ESP_INTR_RSEL
)
197 if(intreg
& ESP_INTR_FDONE
)
199 if(intreg
& ESP_INTR_BSERV
)
201 if(intreg
& ESP_INTR_DC
)
203 if(intreg
& ESP_INTR_IC
)
205 if(intreg
& ESP_INTR_SR
)
206 printk("SCSI_BUS_RESET ");
210 /* Print the sequence step registers contents */
211 static inline void esp_print_seqreg(unchar stepreg
)
213 stepreg
&= ESP_STEP_VBITS
;
215 (stepreg
== ESP_STEP_ASEL
? "SLCT_ARB_CMPLT" :
216 (stepreg
== ESP_STEP_SID
? "1BYTE_MSG_SENT" :
217 (stepreg
== ESP_STEP_NCMD
? "NOT_IN_CMD_PHASE" :
218 (stepreg
== ESP_STEP_PPC
? "CMD_BYTES_LOST" :
219 (stepreg
== ESP_STEP_FINI4
? "CMD_SENT_OK" :
223 static char *phase_string(int phase
)
279 #ifdef DEBUG_STATE_MACHINE
280 static inline void esp_advance_phase(Scsi_Cmnd
*s
, int newphase
)
282 ESPLOG(("<%s>", phase_string(newphase
)));
283 s
->SCp
.sent_command
= s
->SCp
.phase
;
284 s
->SCp
.phase
= newphase
;
287 #define esp_advance_phase(__s, __newphase) \
288 (__s)->SCp.sent_command = (__s)->SCp.phase; \
289 (__s)->SCp.phase = (__newphase);
292 #ifdef DEBUG_ESP_CMDS
293 inline void esp_cmd(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
,
296 esp
->espcmdlog
[esp
->espcmdent
] = cmd
;
297 esp
->espcmdent
= (esp
->espcmdent
+ 1) & 31;
298 esp_write(eregs
->esp_cmnd
, cmd
);
301 #define esp_cmd(__esp, __eregs, __cmd) esp_write((__eregs)->esp_cmnd, (__cmd))
304 /* How we use the various Linux SCSI data structures for operation.
308 * We keep track of the syncronous capabilities of a target
309 * in the device member, using sync_min_period and
310 * sync_max_offset. These are the values we directly write
311 * into the ESP registers while running a command. If offset
312 * is zero the ESP will use asynchronous transfers.
313 * If the borken flag is set we assume we shouldn't even bother
314 * trying to negotiate for synchronous transfer as this target
315 * is really stupid. If we notice the target is dropping the
316 * bus, and we have been allowing it to disconnect, we clear
317 * the disconnect flag.
320 /* Manipulation of the ESP command queues. Thanks to the aha152x driver
321 * and its author, Juergen E. Fischer, for the methods used here.
322 * Note that these are per-ESP queues, not global queues like
323 * the aha152x driver uses.
325 static inline void append_SC(Scsi_Cmnd
**SC
, Scsi_Cmnd
*new_SC
)
329 new_SC
->host_scribble
= (unsigned char *) NULL
;
333 for(end
=*SC
;end
->host_scribble
;end
=(Scsi_Cmnd
*)end
->host_scribble
)
335 end
->host_scribble
= (unsigned char *) new_SC
;
339 static inline void prepend_SC(Scsi_Cmnd
**SC
, Scsi_Cmnd
*new_SC
)
341 new_SC
->host_scribble
= (unsigned char *) *SC
;
345 static inline Scsi_Cmnd
*remove_first_SC(Scsi_Cmnd
**SC
)
351 *SC
= (Scsi_Cmnd
*) (*SC
)->host_scribble
;
355 static inline Scsi_Cmnd
*remove_SC(Scsi_Cmnd
**SC
, int target
, int lun
)
357 Scsi_Cmnd
*ptr
, *prev
;
359 for(ptr
= *SC
, prev
= NULL
;
360 ptr
&& ((ptr
->device
->id
!= target
) || (ptr
->device
->lun
!= lun
));
361 prev
= ptr
, ptr
= (Scsi_Cmnd
*) ptr
->host_scribble
)
365 prev
->host_scribble
=ptr
->host_scribble
;
367 *SC
=(Scsi_Cmnd
*)ptr
->host_scribble
;
372 /* Resetting various pieces of the ESP scsi driver chipset */
374 /* Reset the ESP chip, _not_ the SCSI bus. */
375 static void esp_reset_esp(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
377 int family_code
, version
, i
;
380 /* Now reset the ESP chip */
381 esp_cmd(esp
, eregs
, ESP_CMD_RC
);
382 esp_cmd(esp
, eregs
, ESP_CMD_NULL
| ESP_CMD_DMA
);
383 if(esp
->erev
== fast
)
384 esp_write(eregs
->esp_cfg2
, ESP_CONFIG2_FENAB
);
385 esp_cmd(esp
, eregs
, ESP_CMD_NULL
| ESP_CMD_DMA
);
387 /* This is the only point at which it is reliable to read
388 * the ID-code for a fast ESP chip variant.
390 esp
->max_period
= ((35 * esp
->ccycle
) / 1000);
391 if(esp
->erev
== fast
) {
392 char *erev2string
[] = {
398 "Symbios Logic 53CF9x-2",
402 version
= esp_read(eregs
->esp_uid
);
403 family_code
= (version
& 0xf8) >> 3;
404 if(family_code
== 0x02) {
405 if ((version
& 7) == 2)
409 } else if(family_code
== 0x0a)
410 esp
->erev
= fas366
; /* Version is usually '5'. */
411 else if(family_code
== 0x00) {
412 if ((version
& 7) == 2)
413 esp
->erev
= fas100a
; /* NCR53C9X */
415 esp
->erev
= espunknown
;
416 } else if(family_code
== 0x14) {
417 if ((version
& 7) == 2)
420 esp
->erev
= espunknown
;
421 } else if(family_code
== 0x00) {
422 if ((version
& 7) == 2)
423 esp
->erev
= fas100a
; /* NCR53C9X */
425 esp
->erev
= espunknown
;
427 esp
->erev
= espunknown
;
428 ESPLOG(("esp%d: FAST chip is %s (family=%d, version=%d)\n",
429 esp
->esp_id
, erev2string
[esp
->erev
- fas236
],
430 family_code
, (version
& 7)));
432 esp
->min_period
= ((4 * esp
->ccycle
) / 1000);
434 esp
->min_period
= ((5 * esp
->ccycle
) / 1000);
437 /* Reload the configuration registers */
438 esp_write(eregs
->esp_cfact
, esp
->cfact
);
440 esp_write(eregs
->esp_stp
, 0);
442 esp_write(eregs
->esp_soff
, 0);
443 esp_write(eregs
->esp_timeo
, esp
->neg_defp
);
444 esp
->max_period
= (esp
->max_period
+ 3)>>2;
445 esp
->min_period
= (esp
->min_period
+ 3)>>2;
447 esp_write(eregs
->esp_cfg1
, esp
->config1
);
453 esp_write(eregs
->esp_cfg2
, esp
->config2
);
457 esp_write(eregs
->esp_cfg2
, esp
->config2
);
458 esp
->prev_cfg3
= esp
->config3
[0];
459 esp_write(eregs
->esp_cfg3
, esp
->prev_cfg3
);
462 panic("esp: FAS366 support not present, please notify "
463 "jongk@cs.utwente.nl");
468 /* Fast ESP variants */
469 esp_write(eregs
->esp_cfg2
, esp
->config2
);
471 esp
->config3
[i
] |= ESP_CONFIG3_FCLK
;
472 esp
->prev_cfg3
= esp
->config3
[0];
473 esp_write(eregs
->esp_cfg3
, esp
->prev_cfg3
);
478 /* Different timeout constant for these chips */
480 FSC_NEG_DEFP(esp
->cfreq
,
481 (esp
->cfact
== ESP_CCF_F0
?
482 ESP_CCF_F7
+ 1 : esp
->cfact
));
483 esp_write(eregs
->esp_timeo
, esp
->neg_defp
);
484 /* Enable Active Negotiation if possible */
485 if((esp
->erev
== fsc
) && !esp
->diff
)
486 esp_write(eregs
->esp_cfg4
, ESP_CONFIG4_EAN
);
490 esp_write(eregs
->esp_cfg2
, esp
->config2
);
492 esp
->config3
[i
] |= ESP_CONFIG3_FCLOCK
;
493 esp
->prev_cfg3
= esp
->config3
[0];
494 esp_write(eregs
->esp_cfg3
, esp
->prev_cfg3
);
498 panic("esp: what could it be... I wonder...");
502 /* Eat any bitrot in the chip */
503 trash
= esp_read(eregs
->esp_intrpt
);
507 /* This places the ESP into a known state at boot time. */
508 void esp_bootup_reset(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
510 volatile unchar trash
;
517 esp_reset_esp(esp
, eregs
);
519 /* Reset the SCSI bus, but tell ESP not to generate an irq */
520 esp_write(eregs
->esp_cfg1
, (esp_read(eregs
->esp_cfg1
) | ESP_CONFIG1_SRRDISAB
));
521 esp_cmd(esp
, eregs
, ESP_CMD_RS
);
523 esp_write(eregs
->esp_cfg1
, esp
->config1
);
525 /* Eat any bitrot in the chip and we are done... */
526 trash
= esp_read(eregs
->esp_intrpt
);
529 /* Allocate structure and insert basic data such as SCSI chip frequency
530 * data and a pointer to the device
532 struct NCR_ESP
* esp_allocate(Scsi_Host_Template
*tpnt
, void *esp_dev
)
534 struct NCR_ESP
*esp
, *elink
;
535 struct Scsi_Host
*esp_host
;
537 esp_host
= scsi_register(tpnt
, sizeof(struct NCR_ESP
));
539 panic("Cannot register ESP SCSI host");
540 esp
= (struct NCR_ESP
*) esp_host
->hostdata
;
542 panic("No esp in hostdata");
543 esp
->ehost
= esp_host
;
545 esp
->esp_id
= nesps
++;
547 /* Set bitshift value (only used on Amiga with multiple ESPs) */
550 /* Put into the chain of esp chips detected */
553 while(elink
->next
) elink
= elink
->next
;
563 void esp_deallocate(struct NCR_ESP
*esp
)
565 struct NCR_ESP
*elink
;
567 if(espchain
== esp
) {
570 for(elink
= espchain
; elink
&& (elink
->next
!= esp
); elink
= elink
->next
);
572 elink
->next
= esp
->next
;
577 /* Complete initialization of ESP structure and device
578 * Caller must have initialized appropriate parts of the ESP structure
579 * between the call to esp_allocate and this function.
581 void esp_initialize(struct NCR_ESP
*esp
)
583 struct ESP_regs
*eregs
= esp
->eregs
;
588 /* Check out the clock properties of the chip. */
590 /* This is getting messy but it has to be done
591 * correctly or else you get weird behavior all
592 * over the place. We are trying to basically
593 * figure out three pieces of information.
595 * a) Clock Conversion Factor
597 * This is a representation of the input
598 * crystal clock frequency going into the
599 * ESP on this machine. Any operation whose
600 * timing is longer than 400ns depends on this
601 * value being correct. For example, you'll
602 * get blips for arbitration/selection during
603 * high load or with multiple targets if this
604 * is not set correctly.
606 * b) Selection Time-Out
608 * The ESP isn't very bright and will arbitrate
609 * for the bus and try to select a target
610 * forever if you let it. This value tells
611 * the ESP when it has taken too long to
612 * negotiate and that it should interrupt
613 * the CPU so we can see what happened.
614 * The value is computed as follows (from
615 * NCR/Symbios chip docs).
617 * (Time Out Period) * (Input Clock)
618 * STO = ----------------------------------
619 * (8192) * (Clock Conversion Factor)
621 * You usually want the time out period to be
622 * around 250ms, I think we'll set it a little
623 * bit higher to account for fully loaded SCSI
624 * bus's and slow devices that don't respond so
625 * quickly to selection attempts. (yeah, I know
626 * this is out of spec. but there is a lot of
627 * buggy pieces of firmware out there so bite me)
629 * c) Imperical constants for synchronous offset
630 * and transfer period register values
632 * This entails the smallest and largest sync
633 * period we could ever handle on this ESP.
638 if(fmhz
<= (5000000))
641 ccf
= (((5000000 - 1) + (fmhz
))/(5000000));
642 if(!ccf
|| ccf
> 8) {
643 /* If we can't find anything reasonable,
644 * just assume 20MHZ. This is the clock
645 * frequency of the older sun4c's where I've
646 * been unable to find the clock-frequency
647 * PROM property. All other machines provide
648 * useful values it seems.
653 if(ccf
==(ESP_CCF_F7
+1))
654 esp
->cfact
= ESP_CCF_F0
;
655 else if(ccf
== ESP_CCF_NEVER
)
656 esp
->cfact
= ESP_CCF_F2
;
660 esp
->ccycle
= ESP_MHZ_TO_CYCLE(fmhz
);
661 esp
->ctick
= ESP_TICK(ccf
, esp
->ccycle
);
662 esp
->neg_defp
= ESP_NEG_DEFP(fmhz
, ccf
);
663 esp
->sync_defp
= SYNC_DEFP_SLOW
;
665 printk("SCSI ID %d Clk %dMHz CCF=%d TOut %d ",
666 esp
->scsi_id
, (esp
->cfreq
/ 1000000),
667 ccf
, (int) esp
->neg_defp
);
669 /* Fill in ehost data */
670 esp
->ehost
->base
= (unsigned long)eregs
;
671 esp
->ehost
->this_id
= esp
->scsi_id
;
672 esp
->ehost
->irq
= esp
->irq
;
675 esp
->scsi_id_mask
= (1 << esp
->scsi_id
);
677 /* Probe the revision of this esp */
678 esp
->config1
= (ESP_CONFIG1_PENABLE
| (esp
->scsi_id
& 7));
679 esp
->config2
= (ESP_CONFIG2_SCSI2ENAB
| ESP_CONFIG2_REGPARITY
);
680 esp_write(eregs
->esp_cfg2
, esp
->config2
);
681 if((esp_read(eregs
->esp_cfg2
) & ~(ESP_CONFIG2_MAGIC
)) !=
682 (ESP_CONFIG2_SCSI2ENAB
| ESP_CONFIG2_REGPARITY
)) {
683 printk("NCR53C90(esp100)\n");
687 esp_write(eregs
->esp_cfg2
, 0);
688 esp_write(eregs
->esp_cfg3
, 5);
689 if(esp_read(eregs
->esp_cfg3
) != 5) {
690 printk("NCR53C90A(esp100a)\n");
695 for(target
=0; target
<8; target
++)
696 esp
->config3
[target
] = 0;
698 esp_write(eregs
->esp_cfg3
, 0);
699 if(ccf
> ESP_CCF_F5
) {
700 printk("NCR53C9XF(espfast)\n");
702 esp
->sync_defp
= SYNC_DEFP_FAST
;
704 printk("NCR53C9x(esp236)\n");
710 /* Initialize the command queues */
711 esp
->current_SC
= NULL
;
712 esp
->disconnected_SC
= NULL
;
713 esp
->issue_SC
= NULL
;
715 /* Clear the state machines. */
716 esp
->targets_present
= 0;
717 esp
->resetting_bus
= 0;
720 init_waitqueue_head(&esp
->reset_queue
);
722 esp
->fas_premature_intr_workaround
= 0;
723 for(i
= 0; i
< 32; i
++)
724 esp
->espcmdlog
[i
] = 0;
726 for(i
= 0; i
< 16; i
++) {
727 esp
->cur_msgout
[i
] = 0;
728 esp
->cur_msgin
[i
] = 0;
730 esp
->prevmsgout
= esp
->prevmsgin
= 0;
731 esp
->msgout_len
= esp
->msgin_len
= 0;
733 /* Clear the one behind caches to hold unmatchable values. */
734 esp
->prev_soff
= esp
->prev_stp
= esp
->prev_cfg3
= 0xff;
736 /* Reset the thing before we try anything... */
737 esp_bootup_reset(esp
, eregs
);
742 /* The info function will return whatever useful
743 * information the developer sees fit. If not provided, then
744 * the name field will be used instead.
746 const char *esp_info(struct Scsi_Host
*host
)
750 esp
= (struct NCR_ESP
*) host
->hostdata
;
753 return "ESP100 (NCR53C90)";
755 return "ESP100A (NCR53C90A)";
757 return "ESP236 (NCR53C9x)";
759 return "Emulex FAS216";
761 return "Emulex FAS236";
763 return "QLogic FAS366";
767 return "Symbios Logic 53CF9x-2";
769 panic("Bogon ESP revision");
773 /* From Wolfgang Stanglmeier's NCR scsi driver. */
782 static void copy_mem_info(struct info_str
*info
, char *data
, int len
)
784 if (info
->pos
+ len
> info
->length
)
785 len
= info
->length
- info
->pos
;
787 if (info
->pos
+ len
< info
->offset
) {
791 if (info
->pos
< info
->offset
) {
792 data
+= (info
->offset
- info
->pos
);
793 len
-= (info
->offset
- info
->pos
);
797 memcpy(info
->buffer
+ info
->pos
, data
, len
);
802 static int copy_info(struct info_str
*info
, char *fmt
, ...)
809 len
= vsprintf(buf
, fmt
, args
);
812 copy_mem_info(info
, buf
, len
);
816 static int esp_host_info(struct NCR_ESP
*esp
, char *ptr
, off_t offset
, int len
)
818 struct scsi_device
*sdev
;
819 struct info_str info
;
824 info
.offset
= offset
;
827 copy_info(&info
, "ESP Host Adapter:\n");
828 copy_info(&info
, "\tESP Model\t\t");
831 copy_info(&info
, "ESP100 (NCR53C90)\n");
834 copy_info(&info
, "ESP100A (NCR53C90A)\n");
837 copy_info(&info
, "ESP236 (NCR53C9x)\n");
840 copy_info(&info
, "Emulex FAS216\n");
843 copy_info(&info
, "Emulex FAS236\n");
846 copy_info(&info
, "FPESP100A\n");
849 copy_info(&info
, "Generic FAST\n");
852 copy_info(&info
, "QLogic FAS366\n");
855 copy_info(&info
, "Symbios Logic 53C9x-2\n");
859 copy_info(&info
, "Unknown!\n");
862 copy_info(&info
, "\tLive Targets\t\t[ ");
863 for(i
= 0; i
< 15; i
++) {
864 if(esp
->targets_present
& (1 << i
))
865 copy_info(&info
, "%d ", i
);
867 copy_info(&info
, "]\n\n");
869 /* Now describe the state of each existing target. */
870 copy_info(&info
, "Target #\tconfig3\t\tSync Capabilities\tDisconnect\n");
872 shost_for_each_device(sdev
, esp
->ehost
) {
873 struct esp_device
*esp_dev
= sdev
->hostdata
;
876 if (!(esp
->targets_present
& (1 << id
)))
879 copy_info(&info
, "%d\t\t", id
);
880 copy_info(&info
, "%08lx\t", esp
->config3
[id
]);
881 copy_info(&info
, "[%02lx,%02lx]\t\t\t",
882 esp_dev
->sync_max_offset
,
883 esp_dev
->sync_min_period
);
884 copy_info(&info
, "%s\n", esp_dev
->disconnect
? "yes" : "no");
887 return info
.pos
> info
.offset
? info
.pos
- info
.offset
: 0;
890 /* ESP proc filesystem code. */
891 int esp_proc_info(struct Scsi_Host
*shost
, char *buffer
, char **start
, off_t offset
, int length
,
894 struct NCR_ESP
*esp
= (struct NCR_ESP
*)shost
->hostdata
;
897 return -EINVAL
; /* not yet */
900 return esp_host_info(esp
, buffer
, offset
, length
);
903 static void esp_get_dmabufs(struct NCR_ESP
*esp
, Scsi_Cmnd
*sp
)
905 if(sp
->use_sg
== 0) {
906 sp
->SCp
.this_residual
= sp
->request_bufflen
;
907 sp
->SCp
.buffer
= (struct scatterlist
*) sp
->request_buffer
;
908 sp
->SCp
.buffers_residual
= 0;
909 if (esp
->dma_mmu_get_scsi_one
)
910 esp
->dma_mmu_get_scsi_one(esp
, sp
);
913 (char *) virt_to_phys(sp
->request_buffer
);
915 sp
->SCp
.buffer
= (struct scatterlist
*) sp
->buffer
;
916 sp
->SCp
.buffers_residual
= sp
->use_sg
- 1;
917 sp
->SCp
.this_residual
= sp
->SCp
.buffer
->length
;
918 if (esp
->dma_mmu_get_scsi_sgl
)
919 esp
->dma_mmu_get_scsi_sgl(esp
, sp
);
922 (char *) virt_to_phys((page_address(sp
->SCp
.buffer
->page
) + sp
->SCp
.buffer
->offset
));
926 static void esp_release_dmabufs(struct NCR_ESP
*esp
, Scsi_Cmnd
*sp
)
928 if(sp
->use_sg
== 0) {
929 if (esp
->dma_mmu_release_scsi_one
)
930 esp
->dma_mmu_release_scsi_one(esp
, sp
);
932 if (esp
->dma_mmu_release_scsi_sgl
)
933 esp
->dma_mmu_release_scsi_sgl(esp
, sp
);
937 static void esp_restore_pointers(struct NCR_ESP
*esp
, Scsi_Cmnd
*sp
)
939 struct esp_pointers
*ep
= &esp
->data_pointers
[sp
->device
->id
];
941 sp
->SCp
.ptr
= ep
->saved_ptr
;
942 sp
->SCp
.buffer
= ep
->saved_buffer
;
943 sp
->SCp
.this_residual
= ep
->saved_this_residual
;
944 sp
->SCp
.buffers_residual
= ep
->saved_buffers_residual
;
947 static void esp_save_pointers(struct NCR_ESP
*esp
, Scsi_Cmnd
*sp
)
949 struct esp_pointers
*ep
= &esp
->data_pointers
[sp
->device
->id
];
951 ep
->saved_ptr
= sp
->SCp
.ptr
;
952 ep
->saved_buffer
= sp
->SCp
.buffer
;
953 ep
->saved_this_residual
= sp
->SCp
.this_residual
;
954 ep
->saved_buffers_residual
= sp
->SCp
.buffers_residual
;
959 * 1) Never ever panic while something is live on the bus.
960 * If there is to be any chance of syncing the disks this
961 * rule is to be obeyed.
963 * 2) Any target that causes a foul condition will no longer
964 * have synchronous transfers done to it, no questions
967 * 3) Keep register accesses to a minimum. Think about some
968 * day when we have Xbus machines this is running on and
969 * the ESP chip is on the other end of the machine on a
970 * different board from the cpu where this is running.
973 /* Fire off a command. We assume the bus is free and that the only
974 * case where we could see an interrupt is where we have disconnected
975 * commands active and they are trying to reselect us.
977 static inline void esp_check_cmd(struct NCR_ESP
*esp
, Scsi_Cmnd
*sp
)
979 switch(sp
->cmd_len
) {
983 esp
->esp_slowcmd
= 0;
987 esp
->esp_slowcmd
= 1;
988 esp
->esp_scmdleft
= sp
->cmd_len
;
989 esp
->esp_scmdp
= &sp
->cmnd
[0];
994 static inline void build_sync_nego_msg(struct NCR_ESP
*esp
, int period
, int offset
)
996 esp
->cur_msgout
[0] = EXTENDED_MESSAGE
;
997 esp
->cur_msgout
[1] = 3;
998 esp
->cur_msgout
[2] = EXTENDED_SDTR
;
999 esp
->cur_msgout
[3] = period
;
1000 esp
->cur_msgout
[4] = offset
;
1001 esp
->msgout_len
= 5;
1004 static void esp_exec_cmd(struct NCR_ESP
*esp
)
1006 struct ESP_regs
*eregs
= esp
->eregs
;
1007 struct esp_device
*esp_dev
;
1010 volatile unchar
*cmdp
= esp
->esp_command
;
1011 unsigned char the_esp_command
;
1015 /* Hold off if we have disconnected commands and
1016 * an IRQ is showing...
1018 if(esp
->disconnected_SC
&& esp
->dma_irq_p(esp
))
1021 /* Grab first member of the issue queue. */
1022 SCptr
= esp
->current_SC
= remove_first_SC(&esp
->issue_SC
);
1024 /* Safe to panic here because current_SC is null. */
1026 panic("esp: esp_exec_cmd and issue queue is NULL");
1028 SDptr
= SCptr
->device
;
1029 esp_dev
= SDptr
->hostdata
;
1030 lun
= SCptr
->device
->lun
;
1031 target
= SCptr
->device
->id
;
1034 esp
->msgout_len
= 0;
1036 /* Send it out whole, or piece by piece? The ESP
1037 * only knows how to automatically send out 6, 10,
1038 * and 12 byte commands. I used to think that the
1039 * Linux SCSI code would never throw anything other
1040 * than that to us, but then again there is the
1041 * SCSI generic driver which can send us anything.
1043 esp_check_cmd(esp
, SCptr
);
1045 /* If arbitration/selection is successful, the ESP will leave
1046 * ATN asserted, causing the target to go into message out
1047 * phase. The ESP will feed the target the identify and then
1048 * the target can only legally go to one of command,
1049 * datain/out, status, or message in phase, or stay in message
1050 * out phase (should we be trying to send a sync negotiation
1051 * message after the identify). It is not allowed to drop
1052 * BSY, but some buggy targets do and we check for this
1053 * condition in the selection complete code. Most of the time
1054 * we'll make the command bytes available to the ESP and it
1055 * will not interrupt us until it finishes command phase, we
1056 * cannot do this for command sizes the ESP does not
1057 * understand and in this case we'll get interrupted right
1058 * when the target goes into command phase.
1060 * It is absolutely _illegal_ in the presence of SCSI-2 devices
1061 * to use the ESP select w/o ATN command. When SCSI-2 devices are
1062 * present on the bus we _must_ always go straight to message out
1063 * phase with an identify message for the target. Being that
1064 * selection attempts in SCSI-1 w/o ATN was an option, doing SCSI-2
1065 * selections should not confuse SCSI-1 we hope.
1069 /* this targets sync is known */
1070 #ifdef CONFIG_SCSI_MAC_ESP
1073 if(esp_dev
->disconnect
)
1074 *cmdp
++ = IDENTIFY(1, lun
);
1076 *cmdp
++ = IDENTIFY(0, lun
);
1078 if(esp
->esp_slowcmd
) {
1079 the_esp_command
= (ESP_CMD_SELAS
| ESP_CMD_DMA
);
1080 esp_advance_phase(SCptr
, in_slct_stop
);
1082 the_esp_command
= (ESP_CMD_SELA
| ESP_CMD_DMA
);
1083 esp_advance_phase(SCptr
, in_slct_norm
);
1085 } else if(!(esp
->targets_present
& (1<<target
)) || !(esp_dev
->disconnect
)) {
1086 /* After the bootup SCSI code sends both the
1087 * TEST_UNIT_READY and INQUIRY commands we want
1088 * to at least attempt allowing the device to
1091 ESPMISC(("esp: Selecting device for first time. target=%d "
1092 "lun=%d\n", target
, SCptr
->device
->lun
));
1093 if(!SDptr
->borken
&& !esp_dev
->disconnect
)
1094 esp_dev
->disconnect
= 1;
1096 *cmdp
++ = IDENTIFY(0, lun
);
1097 esp
->prevmsgout
= NOP
;
1098 esp_advance_phase(SCptr
, in_slct_norm
);
1099 the_esp_command
= (ESP_CMD_SELA
| ESP_CMD_DMA
);
1101 /* Take no chances... */
1102 esp_dev
->sync_max_offset
= 0;
1103 esp_dev
->sync_min_period
= 0;
1105 int toshiba_cdrom_hwbug_wkaround
= 0;
1107 #ifdef CONFIG_SCSI_MAC_ESP
1108 /* Never allow synchronous transfers (disconnect OK) on
1109 * Macintosh. Well, maybe later when we figured out how to
1110 * do DMA on the machines that support it ...
1112 esp_dev
->disconnect
= 1;
1113 esp_dev
->sync_max_offset
= 0;
1114 esp_dev
->sync_min_period
= 0;
1119 /* We've talked to this guy before,
1120 * but never negotiated. Let's try
1123 if(!SDptr
->borken
) {
1124 if((SDptr
->type
== TYPE_ROM
) &&
1125 (!strncmp(SDptr
->vendor
, "TOSHIBA", 7))) {
1126 /* Nice try sucker... */
1127 ESPMISC(("esp%d: Disabling sync for buggy "
1128 "Toshiba CDROM.\n", esp
->esp_id
));
1129 toshiba_cdrom_hwbug_wkaround
= 1;
1130 build_sync_nego_msg(esp
, 0, 0);
1132 build_sync_nego_msg(esp
, esp
->sync_defp
, 15);
1135 build_sync_nego_msg(esp
, 0, 0);
1140 /* A fix for broken SCSI1 targets, when they disconnect
1141 * they lock up the bus and confuse ESP. So disallow
1142 * disconnects for SCSI1 targets for now until we
1143 * find a better fix.
1145 * Addendum: This is funny, I figured out what was going
1146 * on. The blotzed SCSI1 target would disconnect,
1147 * one of the other SCSI2 targets or both would be
1148 * disconnected as well. The SCSI1 target would
1149 * stay disconnected long enough that we start
1150 * up a command on one of the SCSI2 targets. As
1151 * the ESP is arbitrating for the bus the SCSI1
1152 * target begins to arbitrate as well to reselect
1153 * the ESP. The SCSI1 target refuses to drop it's
1154 * ID bit on the data bus even though the ESP is
1155 * at ID 7 and is the obvious winner for any
1156 * arbitration. The ESP is a poor sport and refuses
1157 * to lose arbitration, it will continue indefinitely
1158 * trying to arbitrate for the bus and can only be
1159 * stopped via a chip reset or SCSI bus reset.
1160 * Therefore _no_ disconnects for SCSI1 targets
1161 * thank you very much. ;-)
1163 if(((SDptr
->scsi_level
< 3) && (SDptr
->type
!= TYPE_TAPE
)) ||
1164 toshiba_cdrom_hwbug_wkaround
|| SDptr
->borken
) {
1165 ESPMISC((KERN_INFO
"esp%d: Disabling DISCONNECT for target %d "
1166 "lun %d\n", esp
->esp_id
, SCptr
->device
->id
, SCptr
->device
->lun
));
1167 esp_dev
->disconnect
= 0;
1168 *cmdp
++ = IDENTIFY(0, lun
);
1170 *cmdp
++ = IDENTIFY(1, lun
);
1173 /* ESP fifo is only so big...
1174 * Make this look like a slow command.
1176 esp
->esp_slowcmd
= 1;
1177 esp
->esp_scmdleft
= SCptr
->cmd_len
;
1178 esp
->esp_scmdp
= &SCptr
->cmnd
[0];
1180 the_esp_command
= (ESP_CMD_SELAS
| ESP_CMD_DMA
);
1181 esp_advance_phase(SCptr
, in_slct_msg
);
1184 if(!esp
->esp_slowcmd
)
1185 for(i
= 0; i
< SCptr
->cmd_len
; i
++)
1186 *cmdp
++ = SCptr
->cmnd
[i
];
1188 esp_write(eregs
->esp_busid
, (target
& 7));
1189 if (esp
->prev_soff
!= esp_dev
->sync_max_offset
||
1190 esp
->prev_stp
!= esp_dev
->sync_min_period
||
1191 (esp
->erev
> esp100a
&&
1192 esp
->prev_cfg3
!= esp
->config3
[target
])) {
1193 esp
->prev_soff
= esp_dev
->sync_max_offset
;
1194 esp_write(eregs
->esp_soff
, esp
->prev_soff
);
1195 esp
->prev_stp
= esp_dev
->sync_min_period
;
1196 esp_write(eregs
->esp_stp
, esp
->prev_stp
);
1197 if(esp
->erev
> esp100a
) {
1198 esp
->prev_cfg3
= esp
->config3
[target
];
1199 esp_write(eregs
->esp_cfg3
, esp
->prev_cfg3
);
1202 i
= (cmdp
- esp
->esp_command
);
1204 /* Set up the DMA and ESP counters */
1205 if(esp
->do_pio_cmds
){
1211 * It seems this is required, at least to clean up
1212 * after failed commands when using PIO mode ...
1214 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
1217 esp_write(eregs
->esp_fdata
, esp
->esp_command
[j
]);
1218 the_esp_command
&= ~ESP_CMD_DMA
;
1220 /* Tell ESP to "go". */
1221 esp_cmd(esp
, eregs
, the_esp_command
);
1223 /* Set up the ESP counters */
1224 esp_write(eregs
->esp_tclow
, i
);
1225 esp_write(eregs
->esp_tcmed
, 0);
1226 esp
->dma_init_write(esp
, esp
->esp_command_dvma
, i
);
1228 /* Tell ESP to "go". */
1229 esp_cmd(esp
, eregs
, the_esp_command
);
1233 /* Queue a SCSI command delivered from the mid-level Linux SCSI code. */
1234 int esp_queue(Scsi_Cmnd
*SCpnt
, void (*done
)(Scsi_Cmnd
*))
1236 struct NCR_ESP
*esp
;
1238 /* Set up func ptr and initial driver cmd-phase. */
1239 SCpnt
->scsi_done
= done
;
1240 SCpnt
->SCp
.phase
= not_issued
;
1242 esp
= (struct NCR_ESP
*) SCpnt
->device
->host
->hostdata
;
1245 esp
->dma_led_on(esp
);
1247 /* We use the scratch area. */
1248 ESPQUEUE(("esp_queue: target=%d lun=%d ", SCpnt
->device
->id
, SCpnt
->lun
));
1249 ESPDISC(("N<%02x,%02x>", SCpnt
->device
->id
, SCpnt
->lun
));
1251 esp_get_dmabufs(esp
, SCpnt
);
1252 esp_save_pointers(esp
, SCpnt
); /* FIXME for tag queueing */
1254 SCpnt
->SCp
.Status
= CHECK_CONDITION
;
1255 SCpnt
->SCp
.Message
= 0xff;
1256 SCpnt
->SCp
.sent_command
= 0;
1258 /* Place into our queue. */
1259 if(SCpnt
->cmnd
[0] == REQUEST_SENSE
) {
1260 ESPQUEUE(("RQSENSE\n"));
1261 prepend_SC(&esp
->issue_SC
, SCpnt
);
1264 append_SC(&esp
->issue_SC
, SCpnt
);
1267 /* Run it now if we can. */
1268 if(!esp
->current_SC
&& !esp
->resetting_bus
)
1274 /* Only queuing supported in this ESP driver. */
1275 int esp_command(Scsi_Cmnd
*SCpnt
)
1278 struct NCR_ESP
*esp
= (struct NCR_ESP
*) SCpnt
->device
->host
->hostdata
;
1281 ESPLOG(("esp%d: esp_command() called...\n", esp
->esp_id
));
1285 /* Dump driver state. */
1286 static void esp_dump_cmd(Scsi_Cmnd
*SCptr
)
1288 ESPLOG(("[tgt<%02x> lun<%02x> "
1289 "pphase<%s> cphase<%s>]",
1290 SCptr
->device
->id
, SCptr
->device
->lun
,
1291 phase_string(SCptr
->SCp
.sent_command
),
1292 phase_string(SCptr
->SCp
.phase
)));
1295 static void esp_dump_state(struct NCR_ESP
*esp
,
1296 struct ESP_regs
*eregs
)
1298 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
1299 #ifdef DEBUG_ESP_CMDS
1303 ESPLOG(("esp%d: dumping state\n", esp
->esp_id
));
1305 /* Print DMA status */
1306 esp
->dma_dump_state(esp
);
1308 ESPLOG(("esp%d: SW [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
1309 esp
->esp_id
, esp
->sreg
, esp
->seqreg
, esp
->ireg
));
1310 ESPLOG(("esp%d: HW reread [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
1311 esp
->esp_id
, esp_read(eregs
->esp_status
), esp_read(eregs
->esp_sstep
),
1312 esp_read(eregs
->esp_intrpt
)));
1313 #ifdef DEBUG_ESP_CMDS
1314 printk("esp%d: last ESP cmds [", esp
->esp_id
);
1315 i
= (esp
->espcmdent
- 1) & 31;
1317 esp_print_cmd(esp
->espcmdlog
[i
]);
1321 esp_print_cmd(esp
->espcmdlog
[i
]);
1325 esp_print_cmd(esp
->espcmdlog
[i
]);
1329 esp_print_cmd(esp
->espcmdlog
[i
]);
1332 #endif /* (DEBUG_ESP_CMDS) */
1335 ESPLOG(("esp%d: current command ", esp
->esp_id
));
1336 esp_dump_cmd(SCptr
);
1339 SCptr
= esp
->disconnected_SC
;
1340 ESPLOG(("esp%d: disconnected ", esp
->esp_id
));
1342 esp_dump_cmd(SCptr
);
1343 SCptr
= (Scsi_Cmnd
*) SCptr
->host_scribble
;
1348 /* Abort a command. The host_lock is acquired by caller. */
1349 int esp_abort(Scsi_Cmnd
*SCptr
)
1351 struct NCR_ESP
*esp
= (struct NCR_ESP
*) SCptr
->device
->host
->hostdata
;
1352 struct ESP_regs
*eregs
= esp
->eregs
;
1355 ESPLOG(("esp%d: Aborting command\n", esp
->esp_id
));
1356 esp_dump_state(esp
, eregs
);
1358 /* Wheee, if this is the current command on the bus, the
1359 * best we can do is assert ATN and wait for msgout phase.
1360 * This should even fix a hung SCSI bus when we lose state
1361 * in the driver and timeout because the eventual phase change
1362 * will cause the ESP to (eventually) give an interrupt.
1364 if(esp
->current_SC
== SCptr
) {
1365 esp
->cur_msgout
[0] = ABORT
;
1366 esp
->msgout_len
= 1;
1367 esp
->msgout_ctr
= 0;
1368 esp_cmd(esp
, eregs
, ESP_CMD_SATN
);
1372 /* If it is still in the issue queue then we can safely
1373 * call the completion routine and report abort success.
1375 don
= esp
->dma_ports_p(esp
);
1377 esp
->dma_ints_off(esp
);
1378 synchronize_irq(esp
->irq
);
1381 Scsi_Cmnd
**prev
, *this;
1382 for(prev
= (&esp
->issue_SC
), this = esp
->issue_SC
;
1384 prev
= (Scsi_Cmnd
**) &(this->host_scribble
),
1385 this = (Scsi_Cmnd
*) this->host_scribble
) {
1387 *prev
= (Scsi_Cmnd
*) this->host_scribble
;
1388 this->host_scribble
= NULL
;
1389 esp_release_dmabufs(esp
, this);
1390 this->result
= DID_ABORT
<< 16;
1393 esp
->dma_ints_on(esp
);
1399 /* Yuck, the command to abort is disconnected, it is not
1400 * worth trying to abort it now if something else is live
1401 * on the bus at this time. So, we let the SCSI code wait
1402 * a little bit and try again later.
1404 if(esp
->current_SC
) {
1406 esp
->dma_ints_on(esp
);
1410 /* It's disconnected, we have to reconnect to re-establish
1411 * the nexus and tell the device to abort. However, we really
1412 * cannot 'reconnect' per se. Don't try to be fancy, just
1413 * indicate failure, which causes our caller to reset the whole
1418 esp
->dma_ints_on(esp
);
1422 /* We've sent ESP_CMD_RS to the ESP, the interrupt had just
1423 * arrived indicating the end of the SCSI bus reset. Our job
1424 * is to clean out the command queues and begin re-execution
1425 * of SCSI commands once more.
1427 static int esp_finish_reset(struct NCR_ESP
*esp
,
1428 struct ESP_regs
*eregs
)
1430 Scsi_Cmnd
*sp
= esp
->current_SC
;
1432 /* Clean up currently executing command, if any. */
1434 esp_release_dmabufs(esp
, sp
);
1435 sp
->result
= (DID_RESET
<< 16);
1437 esp
->current_SC
= NULL
;
1440 /* Clean up disconnected queue, they have been invalidated
1443 if (esp
->disconnected_SC
) {
1444 while((sp
= remove_first_SC(&esp
->disconnected_SC
)) != NULL
) {
1445 esp_release_dmabufs(esp
, sp
);
1446 sp
->result
= (DID_RESET
<< 16);
1451 /* SCSI bus reset is complete. */
1452 esp
->resetting_bus
= 0;
1453 wake_up(&esp
->reset_queue
);
1455 /* Ok, now it is safe to get commands going once more. */
1462 static int esp_do_resetbus(struct NCR_ESP
*esp
,
1463 struct ESP_regs
*eregs
)
1465 ESPLOG(("esp%d: Resetting scsi bus\n", esp
->esp_id
));
1466 esp
->resetting_bus
= 1;
1467 esp_cmd(esp
, eregs
, ESP_CMD_RS
);
1472 /* Reset ESP chip, reset hanging bus, then kill active and
1473 * disconnected commands for targets without soft reset.
1475 * The host_lock is acquired by caller.
1477 int esp_reset(Scsi_Cmnd
*SCptr
)
1479 struct NCR_ESP
*esp
= (struct NCR_ESP
*) SCptr
->device
->host
->hostdata
;
1481 (void) esp_do_resetbus(esp
, esp
->eregs
);
1483 spin_unlock_irq(esp
->ehost
->host_lock
);
1485 wait_event(esp
->reset_queue
, (esp
->resetting_bus
== 0));
1487 spin_lock_irq(esp
->ehost
->host_lock
);
1492 /* Internal ESP done function. */
1493 static void esp_done(struct NCR_ESP
*esp
, int error
)
1497 if(esp
->current_SC
) {
1498 done_SC
= esp
->current_SC
;
1499 esp
->current_SC
= NULL
;
1500 esp_release_dmabufs(esp
, done_SC
);
1501 done_SC
->result
= error
;
1502 done_SC
->scsi_done(done_SC
);
1504 /* Bus is free, issue any commands in the queue. */
1505 if(esp
->issue_SC
&& !esp
->current_SC
)
1508 /* Panic is safe as current_SC is null so we may still
1509 * be able to accept more commands to sync disk buffers.
1511 ESPLOG(("panicing\n"));
1512 panic("esp: done() called with NULL esp->current_SC");
1516 /* Wheee, ESP interrupt engine. */
1518 /* Forward declarations. */
1519 static int esp_do_phase_determine(struct NCR_ESP
*esp
,
1520 struct ESP_regs
*eregs
);
1521 static int esp_do_data_finale(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
);
1522 static int esp_select_complete(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
);
1523 static int esp_do_status(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
);
1524 static int esp_do_msgin(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
);
1525 static int esp_do_msgindone(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
);
1526 static int esp_do_msgout(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
);
1527 static int esp_do_cmdbegin(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
);
1529 #define sreg_datainp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DIP)
1530 #define sreg_dataoutp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DOP)
1532 /* We try to avoid some interrupts by jumping ahead and see if the ESP
1533 * has gotten far enough yet. Hence the following.
1535 static inline int skipahead1(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
,
1536 Scsi_Cmnd
*scp
, int prev_phase
, int new_phase
)
1538 if(scp
->SCp
.sent_command
!= prev_phase
)
1541 if(esp
->dma_irq_p(esp
)) {
1542 /* Yes, we are able to save an interrupt. */
1543 esp
->sreg
= (esp_read(eregs
->esp_status
) & ~(ESP_STAT_INTR
));
1544 esp
->ireg
= esp_read(eregs
->esp_intrpt
);
1545 if(!(esp
->ireg
& ESP_INTR_SR
))
1548 return do_reset_complete
;
1550 /* Ho hum, target is taking forever... */
1551 scp
->SCp
.sent_command
= new_phase
; /* so we don't recurse... */
1555 static inline int skipahead2(struct NCR_ESP
*esp
,
1556 struct ESP_regs
*eregs
,
1557 Scsi_Cmnd
*scp
, int prev_phase1
, int prev_phase2
,
1560 if(scp
->SCp
.sent_command
!= prev_phase1
&&
1561 scp
->SCp
.sent_command
!= prev_phase2
)
1563 if(esp
->dma_irq_p(esp
)) {
1564 /* Yes, we are able to save an interrupt. */
1565 esp
->sreg
= (esp_read(eregs
->esp_status
) & ~(ESP_STAT_INTR
));
1566 esp
->ireg
= esp_read(eregs
->esp_intrpt
);
1567 if(!(esp
->ireg
& ESP_INTR_SR
))
1570 return do_reset_complete
;
1572 /* Ho hum, target is taking forever... */
1573 scp
->SCp
.sent_command
= new_phase
; /* so we don't recurse... */
1577 /* Misc. esp helper macros. */
1578 #define esp_setcount(__eregs, __cnt) \
1579 esp_write((__eregs)->esp_tclow, ((__cnt) & 0xff)); \
1580 esp_write((__eregs)->esp_tcmed, (((__cnt) >> 8) & 0xff))
1582 #define esp_getcount(__eregs) \
1583 ((esp_read((__eregs)->esp_tclow)&0xff) | \
1584 ((esp_read((__eregs)->esp_tcmed)&0xff) << 8))
1586 #define fcount(__esp, __eregs) \
1587 (esp_read((__eregs)->esp_fflags) & ESP_FF_FBYTES)
1589 #define fnzero(__esp, __eregs) \
1590 (esp_read((__eregs)->esp_fflags) & ESP_FF_ONOTZERO)
1592 /* XXX speculative nops unnecessary when continuing amidst a data phase
1593 * XXX even on esp100!!! another case of flooding the bus with I/O reg
1596 #define esp_maybe_nop(__esp, __eregs) \
1597 if((__esp)->erev == esp100) \
1598 esp_cmd((__esp), (__eregs), ESP_CMD_NULL)
1600 #define sreg_to_dataphase(__sreg) \
1601 ((((__sreg) & ESP_STAT_PMASK) == ESP_DOP) ? in_dataout : in_datain)
1603 /* The ESP100 when in synchronous data phase, can mistake a long final
1604 * REQ pulse from the target as an extra byte, it places whatever is on
1605 * the data lines into the fifo. For now, we will assume when this
1606 * happens that the target is a bit quirky and we don't want to
1607 * be talking synchronously to it anyways. Regardless, we need to
1608 * tell the ESP to eat the extraneous byte so that we can proceed
1609 * to the next phase.
1611 static inline int esp100_sync_hwbug(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
,
1612 Scsi_Cmnd
*sp
, int fifocnt
)
1614 /* Do not touch this piece of code. */
1615 if((!(esp
->erev
== esp100
)) ||
1616 (!(sreg_datainp((esp
->sreg
= esp_read(eregs
->esp_status
))) && !fifocnt
) &&
1617 !(sreg_dataoutp(esp
->sreg
) && !fnzero(esp
, eregs
)))) {
1618 if(sp
->SCp
.phase
== in_dataout
)
1619 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
1622 /* Async mode for this guy. */
1623 build_sync_nego_msg(esp
, 0, 0);
1625 /* Ack the bogus byte, but set ATN first. */
1626 esp_cmd(esp
, eregs
, ESP_CMD_SATN
);
1627 esp_cmd(esp
, eregs
, ESP_CMD_MOK
);
1632 /* This closes the window during a selection with a reselect pending, because
1633 * we use DMA for the selection process the FIFO should hold the correct
1634 * contents if we get reselected during this process. So we just need to
1635 * ack the possible illegal cmd interrupt pending on the esp100.
1637 static inline int esp100_reconnect_hwbug(struct NCR_ESP
*esp
,
1638 struct ESP_regs
*eregs
)
1640 volatile unchar junk
;
1642 if(esp
->erev
!= esp100
)
1644 junk
= esp_read(eregs
->esp_intrpt
);
1646 if(junk
& ESP_INTR_SR
)
1651 /* This verifies the BUSID bits during a reselection so that we know which
1652 * target is talking to us.
1654 static inline int reconnect_target(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
1656 int it
, me
= esp
->scsi_id_mask
, targ
= 0;
1658 if(2 != fcount(esp
, eregs
))
1660 it
= esp_read(eregs
->esp_fdata
);
1671 /* This verifies the identify from the target so that we know which lun is
1672 * being reconnected.
1674 static inline int reconnect_lun(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
1678 if((esp
->sreg
& ESP_STAT_PMASK
) != ESP_MIP
)
1680 lun
= esp_read(eregs
->esp_fdata
);
1682 /* Yes, you read this correctly. We report lun of zero
1683 * if we see parity error. ESP reports parity error for
1684 * the lun byte, and this is the only way to hope to recover
1685 * because the target is connected.
1687 if(esp
->sreg
& ESP_STAT_PERR
)
1690 /* Check for illegal bits being set in the lun. */
1691 if((lun
& 0x40) || !(lun
& 0x80))
1697 /* This puts the driver in a state where it can revitalize a command that
1698 * is being continued due to reselection.
1700 static inline void esp_connect(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
,
1703 Scsi_Device
*dp
= sp
->device
;
1704 struct esp_device
*esp_dev
= dp
->hostdata
;
1706 if(esp
->prev_soff
!= esp_dev
->sync_max_offset
||
1707 esp
->prev_stp
!= esp_dev
->sync_min_period
||
1708 (esp
->erev
> esp100a
&&
1709 esp
->prev_cfg3
!= esp
->config3
[sp
->device
->id
])) {
1710 esp
->prev_soff
= esp_dev
->sync_max_offset
;
1711 esp_write(eregs
->esp_soff
, esp
->prev_soff
);
1712 esp
->prev_stp
= esp_dev
->sync_min_period
;
1713 esp_write(eregs
->esp_stp
, esp
->prev_stp
);
1714 if(esp
->erev
> esp100a
) {
1715 esp
->prev_cfg3
= esp
->config3
[sp
->device
->id
];
1716 esp_write(eregs
->esp_cfg3
, esp
->prev_cfg3
);
1719 esp
->current_SC
= sp
;
1722 /* This will place the current working command back into the issue queue
1723 * if we are to receive a reselection amidst a selection attempt.
1725 static inline void esp_reconnect(struct NCR_ESP
*esp
, Scsi_Cmnd
*sp
)
1727 if(!esp
->disconnected_SC
)
1728 ESPLOG(("esp%d: Weird, being reselected but disconnected "
1729 "command queue is empty.\n", esp
->esp_id
));
1731 esp
->current_SC
= NULL
;
1732 sp
->SCp
.phase
= not_issued
;
1733 append_SC(&esp
->issue_SC
, sp
);
1736 /* Begin message in phase. */
1737 static int esp_do_msgin(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
1739 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
1740 esp_maybe_nop(esp
, eregs
);
1741 esp_cmd(esp
, eregs
, ESP_CMD_TI
);
1744 esp_advance_phase(esp
->current_SC
, in_msgindone
);
1748 static inline void advance_sg(struct NCR_ESP
*esp
, Scsi_Cmnd
*sp
)
1751 --sp
->SCp
.buffers_residual
;
1752 sp
->SCp
.this_residual
= sp
->SCp
.buffer
->length
;
1753 if (esp
->dma_advance_sg
)
1754 esp
->dma_advance_sg (sp
);
1756 sp
->SCp
.ptr
= (char *) virt_to_phys((page_address(sp
->SCp
.buffer
->page
) + sp
->SCp
.buffer
->offset
));
1760 /* Please note that the way I've coded these routines is that I _always_
1761 * check for a disconnect during any and all information transfer
1762 * phases. The SCSI standard states that the target _can_ cause a BUS
1763 * FREE condition by dropping all MSG/CD/IO/BSY signals. Also note
1764 * that during information transfer phases the target controls every
1765 * change in phase, the only thing the initiator can do is "ask" for
1766 * a message out phase by driving ATN true. The target can, and sometimes
1767 * will, completely ignore this request so we cannot assume anything when
1768 * we try to force a message out phase to abort/reset a target. Most of
1769 * the time the target will eventually be nice and go to message out, so
1770 * we may have to hold on to our state about what we want to tell the target
1771 * for some period of time.
1774 /* I think I have things working here correctly. Even partial transfers
1775 * within a buffer or sub-buffer should not upset us at all no matter
1776 * how bad the target and/or ESP fucks things up.
1778 static int esp_do_data(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
1780 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
1781 int thisphase
, hmuch
;
1783 ESPDATA(("esp_do_data: "));
1784 esp_maybe_nop(esp
, eregs
);
1785 thisphase
= sreg_to_dataphase(esp
->sreg
);
1786 esp_advance_phase(SCptr
, thisphase
);
1787 ESPDATA(("newphase<%s> ", (thisphase
== in_datain
) ? "DATAIN" : "DATAOUT"));
1788 hmuch
= esp
->dma_can_transfer(esp
, SCptr
);
1791 * XXX MSch: cater for PIO transfer here; PIO used if hmuch == 0
1793 if (hmuch
) { /* DMA */
1797 ESPDATA(("hmuch<%d> ", hmuch
));
1798 esp
->current_transfer_size
= hmuch
;
1799 esp_setcount(eregs
, (esp
->fas_premature_intr_workaround
?
1800 (hmuch
+ 0x40) : hmuch
));
1801 esp
->dma_setup(esp
, (__u32
)((unsigned long)SCptr
->SCp
.ptr
),
1802 hmuch
, (thisphase
== in_datain
));
1803 ESPDATA(("DMA|TI --> do_intr_end\n"));
1804 esp_cmd(esp
, eregs
, ESP_CMD_DMA
| ESP_CMD_TI
);
1813 int oldphase
, i
= 0; /* or where we left off last time ?? esp->current_data ?? */
1816 oldphase
= esp_read(eregs
->esp_status
) & ESP_STAT_PMASK
;
1819 * polled transfer; ugly, can we make this happen in a DRQ
1820 * interrupt handler ??
1821 * requires keeping track of state information in host or
1823 * Problem: I've never seen a DRQ happen on Mac, not even
1824 * with ESP_CMD_DMA ...
1827 /* figure out how much needs to be transferred */
1828 hmuch
= SCptr
->SCp
.this_residual
;
1829 ESPDATA(("hmuch<%d> pio ", hmuch
));
1830 esp
->current_transfer_size
= hmuch
;
1832 /* tell the ESP ... */
1833 esp_setcount(eregs
, hmuch
);
1837 int j
, fifo_stuck
= 0, newphase
;
1838 unsigned long flags
, timeout
;
1843 ESPDATA(( /*"\n"*/ "\r"));
1846 local_irq_save(flags
);
1848 if(thisphase
== in_datain
) {
1850 esp_cmd(esp
, eregs
, ESP_CMD_TI
);
1854 while (!((esp
->sreg
=esp_read(eregs
->esp_status
)) & ESP_STAT_INTR
) && --timeout
)
1857 printk("DRQ datain timeout! \n");
1859 newphase
= esp
->sreg
& ESP_STAT_PMASK
;
1861 /* see how much we got ... */
1862 fifocnt
= (esp_read(eregs
->esp_fflags
) & ESP_FF_FBYTES
);
1869 ESPDATA(("\rgot %d st %x ph %x", fifocnt
, esp
->sreg
, newphase
));
1872 for(j
=0;j
<fifocnt
;j
++)
1873 SCptr
->SCp
.ptr
[i
++] = esp_read(eregs
->esp_fdata
);
1875 ESPDATA(("(%d) ", i
));
1877 /* how many to go ?? */
1880 /* break if status phase !! */
1881 if(newphase
== ESP_STATP
) {
1883 esp
->ireg
= esp_read(eregs
->esp_intrpt
);
1888 /* how much will fit ? */
1889 int this_count
= MAX_FIFO
- fifocnt
;
1890 if (this_count
> hmuch
)
1894 for(j
=0;j
<this_count
;j
++)
1895 esp_write(eregs
->esp_fdata
, SCptr
->SCp
.ptr
[i
++]);
1897 /* how many left if this goes out ?? */
1898 hmuch
-= this_count
;
1901 esp_cmd(esp
, eregs
, ESP_CMD_TI
);
1903 /* wait for 'got it' */
1905 while (!((esp
->sreg
=esp_read(eregs
->esp_status
)) & ESP_STAT_INTR
) && --timeout
)
1908 printk("DRQ dataout timeout! \n");
1910 newphase
= esp
->sreg
& ESP_STAT_PMASK
;
1912 /* need to check how much was sent ?? */
1913 fifocnt
= (esp_read(eregs
->esp_fflags
) & ESP_FF_FBYTES
);
1915 ESPDATA(("\rsent %d st %x ph %x", this_count
- fifocnt
, esp
->sreg
, newphase
));
1917 ESPDATA(("(%d) ", i
));
1919 /* break if status phase !! */
1920 if(newphase
== ESP_STATP
) {
1922 esp
->ireg
= esp_read(eregs
->esp_intrpt
);
1929 esp
->ireg
= esp_read(eregs
->esp_intrpt
);
1931 ESPDATA(("ir %x ... ", esp
->ireg
));
1934 ESPDATA(("done! \n"));
1937 local_irq_restore(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 transferred ... ", i
));
1952 } else if (esp
->ireg
& ESP_INTR_FDONE
) {
1954 ESPDATA(("function done; %d transferred ... ", i
));
1958 /* XXX fixme: bail out on stall */
1959 if (fifo_stuck
> 10) {
1961 ESPDATA(("fifo stall; %d transferred ... ", 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 transferred */
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 struct esp_device
*esp_dev
= SCptr
->device
->hostdata
;
1991 int bogus_data
= 0, bytes_sent
= 0, fifocnt
, ecount
= 0;
1993 if(esp
->dma_led_off
)
1994 esp
->dma_led_off(esp
);
1996 ESPDATA(("esp_do_data_finale: "));
1998 if(SCptr
->SCp
.phase
== in_datain
) {
1999 if(esp
->sreg
& ESP_STAT_PERR
) {
2000 /* Yuck, parity error. The ESP asserts ATN
2001 * so that we can go to message out phase
2002 * immediately and inform the target that
2003 * something bad happened.
2005 ESPLOG(("esp%d: data bad parity detected.\n",
2007 esp
->cur_msgout
[0] = INITIATOR_ERROR
;
2008 esp
->msgout_len
= 1;
2011 esp
->dma_drain(esp
);
2013 if(esp
->dma_invalidate
)
2014 esp
->dma_invalidate(esp
);
2016 /* This could happen for the above parity error case. */
2017 if(!(esp
->ireg
== ESP_INTR_BSERV
)) {
2018 /* Please go to msgout phase, please please please... */
2019 ESPLOG(("esp%d: !BSERV after data, probably to msgout\n",
2021 return esp_do_phase_determine(esp
, eregs
);
2024 /* Check for partial transfers and other horrible events. */
2025 fifocnt
= (esp_read(eregs
->esp_fflags
) & ESP_FF_FBYTES
);
2026 ecount
= esp_getcount(eregs
);
2027 if(esp
->fas_premature_intr_workaround
)
2029 bytes_sent
= esp
->current_transfer_size
;
2031 ESPDATA(("trans_sz=%d, ", bytes_sent
));
2032 if(!(esp
->sreg
& ESP_STAT_TCNT
))
2033 bytes_sent
-= ecount
;
2034 if(SCptr
->SCp
.phase
== in_dataout
)
2035 bytes_sent
-= fifocnt
;
2037 ESPDATA(("bytes_sent=%d (ecount=%d, fifocnt=%d), ", bytes_sent
,
2040 /* If we were in synchronous mode, check for peculiarities. */
2041 if(esp_dev
->sync_max_offset
)
2042 bogus_data
= esp100_sync_hwbug(esp
, eregs
, SCptr
, fifocnt
);
2044 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
2046 /* Until we are sure of what has happened, we are certainly
2049 esp_advance_phase(SCptr
, in_the_dark
);
2051 /* Check for premature interrupt condition. Can happen on FAS2x6
2052 * chips. QLogic recommends a workaround by overprogramming the
2053 * transfer counters, but this makes doing scatter-gather impossible.
2054 * Until there is a way to disable scatter-gather for a single target,
2055 * and not only for the entire host adapter as it is now, the workaround
2056 * is way to expensive performance wise.
2057 * Instead, it turns out that when this happens the target has disconnected
2058 * already but it doesn't show in the interrupt register. Compensate for
2059 * that here to try and avoid a SCSI bus reset.
2061 if(!esp
->fas_premature_intr_workaround
&& (fifocnt
== 1) &&
2062 sreg_dataoutp(esp
->sreg
)) {
2063 ESPLOG(("esp%d: Premature interrupt, enabling workaround\n",
2066 /* Disable scatter-gather operations, they are not possible
2067 * when using this workaround.
2069 esp
->ehost
->sg_tablesize
= 0;
2070 esp
->ehost
->use_clustering
= ENABLE_CLUSTERING
;
2071 esp
->fas_premature_intr_workaround
= 1;
2074 ESPLOG(("esp%d: Aborting scatter-gather operation\n",
2076 esp
->cur_msgout
[0] = ABORT
;
2077 esp
->msgout_len
= 1;
2078 esp
->msgout_ctr
= 0;
2079 esp_cmd(esp
, eregs
, ESP_CMD_SATN
);
2080 esp_setcount(eregs
, 0xffff);
2081 esp_cmd(esp
, eregs
, ESP_CMD_NULL
);
2082 esp_cmd(esp
, eregs
, ESP_CMD_TPAD
| ESP_CMD_DMA
);
2086 /* Just set the disconnected bit. That's what appears to
2087 * happen anyway. The state machine will pick it up when
2090 esp
->ireg
|= ESP_INTR_DC
;
2094 if(bytes_sent
< 0) {
2095 /* I've seen this happen due to lost state in this
2096 * driver. No idea why it happened, but allowing
2097 * this value to be negative caused things to
2098 * lock up. This allows greater chance of recovery.
2099 * In fact every time I've seen this, it has been
2100 * a driver bug without question.
2102 ESPLOG(("esp%d: yieee, bytes_sent < 0!\n", esp
->esp_id
));
2103 ESPLOG(("esp%d: csz=%d fifocount=%d ecount=%d\n",
2105 esp
->current_transfer_size
, fifocnt
, ecount
));
2106 ESPLOG(("esp%d: use_sg=%d ptr=%p this_residual=%d\n",
2108 SCptr
->use_sg
, SCptr
->SCp
.ptr
, SCptr
->SCp
.this_residual
));
2109 ESPLOG(("esp%d: Forcing async for target %d\n", esp
->esp_id
,
2110 SCptr
->device
->id
));
2111 SCptr
->device
->borken
= 1;
2116 /* Update the state of our transfer. */
2117 SCptr
->SCp
.ptr
+= bytes_sent
;
2118 SCptr
->SCp
.this_residual
-= bytes_sent
;
2119 if(SCptr
->SCp
.this_residual
< 0) {
2121 ESPLOG(("esp%d: Data transfer overrun.\n", esp
->esp_id
));
2122 SCptr
->SCp
.this_residual
= 0;
2125 /* Maybe continue. */
2127 ESPDATA(("!bogus_data, "));
2128 /* NO MATTER WHAT, we advance the scatterlist,
2129 * if the target should decide to disconnect
2130 * in between scatter chunks (which is common)
2131 * we could die horribly! I used to have the sg
2132 * advance occur only if we are going back into
2133 * (or are staying in) a data phase, you can
2134 * imagine the hell I went through trying to
2137 if(!SCptr
->SCp
.this_residual
&& SCptr
->SCp
.buffers_residual
)
2138 advance_sg(esp
, SCptr
);
2139 #ifdef DEBUG_ESP_DATA
2140 if(sreg_datainp(esp
->sreg
) || sreg_dataoutp(esp
->sreg
)) {
2141 ESPDATA(("to more data\n"));
2143 ESPDATA(("to new phase\n"));
2146 return esp_do_phase_determine(esp
, eregs
);
2148 /* Bogus data, just wait for next interrupt. */
2149 ESPLOG(("esp%d: bogus_data during end of data phase\n",
2154 /* We received a non-good status return at the end of
2155 * running a SCSI command. This is used to decide if
2156 * we should clear our synchronous transfer state for
2157 * such a device when that happens.
2159 * The idea is that when spinning up a disk or rewinding
2160 * a tape, we don't want to go into a loop re-negotiating
2161 * synchronous capabilities over and over.
2163 static int esp_should_clear_sync(Scsi_Cmnd
*sp
)
2165 unchar cmd1
= sp
->cmnd
[0];
2166 unchar cmd2
= sp
->data_cmnd
[0];
2168 /* These cases are for spinning up a disk and
2169 * waiting for that spinup to complete.
2171 if(cmd1
== START_STOP
||
2175 if(cmd1
== TEST_UNIT_READY
||
2176 cmd2
== TEST_UNIT_READY
)
2179 /* One more special case for SCSI tape drives,
2180 * this is what is used to probe the device for
2181 * completion of a rewind or tape load operation.
2183 if(sp
->device
->type
== TYPE_TAPE
) {
2184 if(cmd1
== MODE_SENSE
||
2192 /* Either a command is completing or a target is dropping off the bus
2193 * to continue the command in the background so we can do other work.
2195 static int esp_do_freebus(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
2197 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
2200 rval
= skipahead2(esp
, eregs
, SCptr
, in_status
, in_msgindone
, in_freeing
);
2204 if(esp
->ireg
!= ESP_INTR_DC
) {
2205 ESPLOG(("esp%d: Target will not disconnect\n", esp
->esp_id
));
2206 return do_reset_bus
; /* target will not drop BSY... */
2208 esp
->msgout_len
= 0;
2209 esp
->prevmsgout
= NOP
;
2210 if(esp
->prevmsgin
== COMMAND_COMPLETE
) {
2211 struct esp_device
*esp_dev
= SCptr
->device
->hostdata
;
2212 /* Normal end of nexus. */
2213 if(esp
->disconnected_SC
)
2214 esp_cmd(esp
, eregs
, ESP_CMD_ESEL
);
2216 if(SCptr
->SCp
.Status
!= GOOD
&&
2217 SCptr
->SCp
.Status
!= CONDITION_GOOD
&&
2218 ((1<<SCptr
->device
->id
) & esp
->targets_present
) &&
2219 esp_dev
->sync
&& esp_dev
->sync_max_offset
) {
2220 /* SCSI standard says that the synchronous capabilities
2221 * should be renegotiated at this point. Most likely
2222 * we are about to request sense from this target
2223 * in which case we want to avoid using sync
2224 * transfers until we are sure of the current target
2227 ESPMISC(("esp: Status <%d> for target %d lun %d\n",
2228 SCptr
->SCp
.Status
, SCptr
->device
->id
, SCptr
->device
->lun
));
2230 /* But don't do this when spinning up a disk at
2231 * boot time while we poll for completion as it
2232 * fills up the console with messages. Also, tapes
2233 * can report not ready many times right after
2234 * loading up a tape.
2236 if(esp_should_clear_sync(SCptr
) != 0)
2239 ESPDISC(("F<%02x,%02x>", SCptr
->device
->id
, SCptr
->device
->lun
));
2240 esp_done(esp
, ((SCptr
->SCp
.Status
& 0xff) |
2241 ((SCptr
->SCp
.Message
& 0xff)<<8) |
2243 } else if(esp
->prevmsgin
== DISCONNECT
) {
2244 /* Normal disconnect. */
2245 esp_cmd(esp
, eregs
, ESP_CMD_ESEL
);
2246 ESPDISC(("D<%02x,%02x>", SCptr
->device
->id
, SCptr
->device
->lun
));
2247 append_SC(&esp
->disconnected_SC
, SCptr
);
2248 esp
->current_SC
= NULL
;
2252 /* Driver bug, we do not expect a disconnect here
2253 * and should not have advanced the state engine
2256 ESPLOG(("esp%d: last msg not disc and not cmd cmplt.\n",
2258 return do_reset_bus
;
2263 /* When a reselect occurs, and we cannot find the command to
2264 * reconnect to in our queues, we do this.
2266 static int esp_bad_reconnect(struct NCR_ESP
*esp
)
2270 ESPLOG(("esp%d: Eieeee, reconnecting unknown command!\n",
2272 ESPLOG(("QUEUE DUMP\n"));
2274 ESPLOG(("esp%d: issue_SC[", esp
->esp_id
));
2276 ESPLOG(("<%02x,%02x>", sp
->device
->id
, sp
->device
->lun
));
2277 sp
= (Scsi_Cmnd
*) sp
->host_scribble
;
2280 sp
= esp
->current_SC
;
2281 ESPLOG(("esp%d: current_SC[", esp
->esp_id
));
2283 ESPLOG(("<%02x,%02x>", sp
->device
->id
, sp
->device
->lun
));
2284 sp
= (Scsi_Cmnd
*) sp
->host_scribble
;
2287 sp
= esp
->disconnected_SC
;
2288 ESPLOG(("esp%d: disconnected_SC[", esp
->esp_id
));
2290 ESPLOG(("<%02x,%02x>", sp
->device
->id
, sp
->device
->lun
));
2291 sp
= (Scsi_Cmnd
*) sp
->host_scribble
;
2294 return do_reset_bus
;
2297 /* Do the needy when a target tries to reconnect to us. */
2298 static int esp_do_reconnect(struct NCR_ESP
*esp
,
2299 struct ESP_regs
*eregs
)
2304 /* Check for all bogus conditions first. */
2305 target
= reconnect_target(esp
, eregs
);
2307 ESPDISC(("bad bus bits\n"));
2308 return do_reset_bus
;
2310 lun
= reconnect_lun(esp
, eregs
);
2312 ESPDISC(("target=%2x, bad identify msg\n", target
));
2313 return do_reset_bus
;
2316 /* Things look ok... */
2317 ESPDISC(("R<%02x,%02x>", target
, lun
));
2319 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
2320 if(esp100_reconnect_hwbug(esp
, eregs
))
2321 return do_reset_bus
;
2322 esp_cmd(esp
, eregs
, ESP_CMD_NULL
);
2324 SCptr
= remove_SC(&esp
->disconnected_SC
, (unchar
) target
, (unchar
) lun
);
2326 return esp_bad_reconnect(esp
);
2328 esp_connect(esp
, eregs
, SCptr
);
2329 esp_cmd(esp
, eregs
, ESP_CMD_MOK
);
2331 /* Reconnect implies a restore pointers operation. */
2332 esp_restore_pointers(esp
, SCptr
);
2335 esp_advance_phase(SCptr
, in_the_dark
);
2339 /* End of NEXUS (hopefully), pick up status + message byte then leave if
2342 static int esp_do_status(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
2344 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
2347 rval
= skipahead1(esp
, eregs
, SCptr
, in_the_dark
, in_status
);
2352 ESPSTAT(("esp_do_status: "));
2353 if(intr
!= ESP_INTR_DC
) {
2354 int message_out
= 0; /* for parity problems */
2356 /* Ack the message. */
2357 ESPSTAT(("ack msg, "));
2358 esp_cmd(esp
, eregs
, ESP_CMD_MOK
);
2361 esp
->dma_poll(esp
, (unsigned char *) esp
->esp_command
);
2363 ESPSTAT(("got something, "));
2364 /* ESP chimes in with one of
2366 * 1) function done interrupt:
2367 * both status and message in bytes
2370 * 2) bus service interrupt:
2371 * only status byte was acquired
2374 * can't happen, but we test for it
2377 * ALSO: If bad parity was detected on either
2378 * the status _or_ the message byte then
2379 * the ESP has asserted ATN on the bus
2380 * and we must therefore wait for the
2381 * next phase change.
2383 if(intr
& ESP_INTR_FDONE
) {
2384 /* We got it all, hallejulia. */
2385 ESPSTAT(("got both, "));
2386 SCptr
->SCp
.Status
= esp
->esp_command
[0];
2387 SCptr
->SCp
.Message
= esp
->esp_command
[1];
2388 esp
->prevmsgin
= SCptr
->SCp
.Message
;
2389 esp
->cur_msgin
[0] = SCptr
->SCp
.Message
;
2390 if(esp
->sreg
& ESP_STAT_PERR
) {
2391 /* There was bad parity for the
2392 * message byte, the status byte
2395 message_out
= MSG_PARITY_ERROR
;
2397 } else if(intr
== ESP_INTR_BSERV
) {
2398 /* Only got status byte. */
2399 ESPLOG(("esp%d: got status only, ", esp
->esp_id
));
2400 if(!(esp
->sreg
& ESP_STAT_PERR
)) {
2401 SCptr
->SCp
.Status
= esp
->esp_command
[0];
2402 SCptr
->SCp
.Message
= 0xff;
2404 /* The status byte had bad parity.
2405 * we leave the scsi_pointer Status
2406 * field alone as we set it to a default
2407 * of CHECK_CONDITION in esp_queue.
2409 message_out
= INITIATOR_ERROR
;
2412 /* This shouldn't happen ever. */
2413 ESPSTAT(("got bolixed\n"));
2414 esp_advance_phase(SCptr
, in_the_dark
);
2415 return esp_do_phase_determine(esp
, eregs
);
2419 ESPSTAT(("status=%2x msg=%2x, ", SCptr
->SCp
.Status
,
2420 SCptr
->SCp
.Message
));
2421 if(SCptr
->SCp
.Message
== COMMAND_COMPLETE
) {
2422 ESPSTAT(("and was COMMAND_COMPLETE\n"));
2423 esp_advance_phase(SCptr
, in_freeing
);
2424 return esp_do_freebus(esp
, eregs
);
2426 ESPLOG(("esp%d: and _not_ COMMAND_COMPLETE\n",
2428 esp
->msgin_len
= esp
->msgin_ctr
= 1;
2429 esp_advance_phase(SCptr
, in_msgindone
);
2430 return esp_do_msgindone(esp
, eregs
);
2433 /* With luck we'll be able to let the target
2434 * know that bad parity happened, it will know
2435 * which byte caused the problems and send it
2436 * again. For the case where the status byte
2437 * receives bad parity, I do not believe most
2438 * targets recover very well. We'll see.
2440 ESPLOG(("esp%d: bad parity somewhere mout=%2x\n",
2441 esp
->esp_id
, message_out
));
2442 esp
->cur_msgout
[0] = message_out
;
2443 esp
->msgout_len
= esp
->msgout_ctr
= 1;
2444 esp_advance_phase(SCptr
, in_the_dark
);
2445 return esp_do_phase_determine(esp
, eregs
);
2448 /* If we disconnect now, all hell breaks loose. */
2449 ESPLOG(("esp%d: whoops, disconnect\n", esp
->esp_id
));
2450 esp_advance_phase(SCptr
, in_the_dark
);
2451 return esp_do_phase_determine(esp
, eregs
);
2455 static int esp_enter_status(struct NCR_ESP
*esp
,
2456 struct ESP_regs
*eregs
)
2458 unchar thecmd
= ESP_CMD_ICCSEQ
;
2460 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
2462 if(esp
->do_pio_cmds
) {
2463 esp_advance_phase(esp
->current_SC
, in_status
);
2464 esp_cmd(esp
, eregs
, thecmd
);
2465 while(!(esp_read(esp
->eregs
->esp_status
) & ESP_STAT_INTR
));
2466 esp
->esp_command
[0] = esp_read(eregs
->esp_fdata
);
2467 while(!(esp_read(esp
->eregs
->esp_status
) & ESP_STAT_INTR
));
2468 esp
->esp_command
[1] = esp_read(eregs
->esp_fdata
);
2470 esp
->esp_command
[0] = esp
->esp_command
[1] = 0xff;
2471 esp_write(eregs
->esp_tclow
, 2);
2472 esp_write(eregs
->esp_tcmed
, 0);
2473 esp
->dma_init_read(esp
, esp
->esp_command_dvma
, 2);
2474 thecmd
|= ESP_CMD_DMA
;
2475 esp_cmd(esp
, eregs
, thecmd
);
2476 esp_advance_phase(esp
->current_SC
, in_status
);
2479 return esp_do_status(esp
, eregs
);
2482 static int esp_disconnect_amidst_phases(struct NCR_ESP
*esp
,
2483 struct ESP_regs
*eregs
)
2485 Scsi_Cmnd
*sp
= esp
->current_SC
;
2486 struct esp_device
*esp_dev
= sp
->device
->hostdata
;
2488 /* This means real problems if we see this
2489 * here. Unless we were actually trying
2490 * to force the device to abort/reset.
2492 ESPLOG(("esp%d: Disconnect amidst phases, ", esp
->esp_id
));
2493 ESPLOG(("pphase<%s> cphase<%s>, ",
2494 phase_string(sp
->SCp
.phase
),
2495 phase_string(sp
->SCp
.sent_command
)));
2497 if(esp
->disconnected_SC
)
2498 esp_cmd(esp
, eregs
, ESP_CMD_ESEL
);
2500 switch(esp
->cur_msgout
[0]) {
2502 /* We didn't expect this to happen at all. */
2503 ESPLOG(("device is bolixed\n"));
2504 esp_advance_phase(sp
, in_tgterror
);
2505 esp_done(esp
, (DID_ERROR
<< 16));
2508 case BUS_DEVICE_RESET
:
2509 ESPLOG(("device reset successful\n"));
2510 esp_dev
->sync_max_offset
= 0;
2511 esp_dev
->sync_min_period
= 0;
2513 esp_advance_phase(sp
, in_resetdev
);
2514 esp_done(esp
, (DID_RESET
<< 16));
2518 ESPLOG(("device abort successful\n"));
2519 esp_advance_phase(sp
, in_abortone
);
2520 esp_done(esp
, (DID_ABORT
<< 16));
2527 static int esp_enter_msgout(struct NCR_ESP
*esp
,
2528 struct ESP_regs
*eregs
)
2530 esp_advance_phase(esp
->current_SC
, in_msgout
);
2531 return esp_do_msgout(esp
, eregs
);
2534 static int esp_enter_msgin(struct NCR_ESP
*esp
,
2535 struct ESP_regs
*eregs
)
2537 esp_advance_phase(esp
->current_SC
, in_msgin
);
2538 return esp_do_msgin(esp
, eregs
);
2541 static int esp_enter_cmd(struct NCR_ESP
*esp
,
2542 struct ESP_regs
*eregs
)
2544 esp_advance_phase(esp
->current_SC
, in_cmdbegin
);
2545 return esp_do_cmdbegin(esp
, eregs
);
2548 static int esp_enter_badphase(struct NCR_ESP
*esp
,
2549 struct ESP_regs
*eregs
)
2551 ESPLOG(("esp%d: Bizarre bus phase %2x.\n", esp
->esp_id
,
2552 esp
->sreg
& ESP_STAT_PMASK
));
2553 return do_reset_bus
;
2556 typedef int (*espfunc_t
)(struct NCR_ESP
*,
2559 static espfunc_t phase_vector
[] = {
2560 esp_do_data
, /* ESP_DOP */
2561 esp_do_data
, /* ESP_DIP */
2562 esp_enter_cmd
, /* ESP_CMDP */
2563 esp_enter_status
, /* ESP_STATP */
2564 esp_enter_badphase
, /* ESP_STAT_PMSG */
2565 esp_enter_badphase
, /* ESP_STAT_PMSG | ESP_STAT_PIO */
2566 esp_enter_msgout
, /* ESP_MOP */
2567 esp_enter_msgin
, /* ESP_MIP */
2570 /* The target has control of the bus and we have to see where it has
2573 static int esp_do_phase_determine(struct NCR_ESP
*esp
,
2574 struct ESP_regs
*eregs
)
2576 if ((esp
->ireg
& ESP_INTR_DC
) != 0)
2577 return esp_disconnect_amidst_phases(esp
, eregs
);
2578 return phase_vector
[esp
->sreg
& ESP_STAT_PMASK
](esp
, eregs
);
2581 /* First interrupt after exec'ing a cmd comes here. */
2582 static int esp_select_complete(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
2584 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
2585 struct esp_device
*esp_dev
= SCptr
->device
->hostdata
;
2586 int cmd_bytes_sent
, fcnt
;
2588 fcnt
= (esp_read(eregs
->esp_fflags
) & ESP_FF_FBYTES
);
2589 cmd_bytes_sent
= esp
->dma_bytes_sent(esp
, fcnt
);
2590 if(esp
->dma_invalidate
)
2591 esp
->dma_invalidate(esp
);
2593 /* Let's check to see if a reselect happened
2594 * while we we're trying to select. This must
2597 if(esp
->ireg
== (ESP_INTR_RSEL
| ESP_INTR_FDONE
)) {
2598 esp_reconnect(esp
, SCptr
);
2599 return esp_do_reconnect(esp
, eregs
);
2602 /* Looks like things worked, we should see a bus service &
2603 * a function complete interrupt at this point. Note we
2604 * are doing a direct comparison because we don't want to
2605 * be fooled into thinking selection was successful if
2606 * ESP_INTR_DC is set, see below.
2608 if(esp
->ireg
== (ESP_INTR_FDONE
| ESP_INTR_BSERV
)) {
2609 /* target speaks... */
2610 esp
->targets_present
|= (1<<SCptr
->device
->id
);
2612 /* What if the target ignores the sdtr? */
2616 /* See how far, if at all, we got in getting
2617 * the information out to the target.
2619 switch(esp
->seqreg
) {
2623 /* Arbitration won, target selected, but
2624 * we are in some phase which is not command
2625 * phase nor is it message out phase.
2627 * XXX We've confused the target, obviously.
2628 * XXX So clear it's state, but we also end
2629 * XXX up clearing everyone elses. That isn't
2630 * XXX so nice. I'd like to just reset this
2631 * XXX target, but if I cannot even get it's
2632 * XXX attention and finish selection to talk
2633 * XXX to it, there is not much more I can do.
2634 * XXX If we have a loaded bus we're going to
2635 * XXX spend the next second or so renegotiating
2636 * XXX for synchronous transfers.
2638 ESPLOG(("esp%d: STEP_ASEL for tgt %d\n",
2639 esp
->esp_id
, SCptr
->device
->id
));
2642 /* Arbitration won, target selected, went
2643 * to message out phase, sent one message
2644 * byte, then we stopped. ATN is asserted
2645 * on the SCSI bus and the target is still
2646 * there hanging on. This is a legal
2647 * sequence step if we gave the ESP a select
2650 * XXX See above, I could set the borken flag
2651 * XXX in the device struct and retry the
2652 * XXX command. But would that help for
2653 * XXX tagged capable targets?
2657 /* Arbitration won, target selected, maybe
2658 * sent the one message byte in message out
2659 * phase, but we did not go to command phase
2660 * in the end. Actually, we could have sent
2661 * only some of the message bytes if we tried
2662 * to send out the entire identify and tag
2663 * message using ESP_CMD_SA3.
2669 /* No, not the powerPC pinhead. Arbitration
2670 * won, all message bytes sent if we went to
2671 * message out phase, went to command phase
2672 * but only part of the command was sent.
2674 * XXX I've seen this, but usually in conjunction
2675 * XXX with a gross error which appears to have
2676 * XXX occurred between the time I told the
2677 * XXX ESP to arbitrate and when I got the
2678 * XXX interrupt. Could I have misloaded the
2679 * XXX command bytes into the fifo? Actually,
2680 * XXX I most likely missed a phase, and therefore
2681 * XXX went into never never land and didn't even
2682 * XXX know it. That was the old driver though.
2683 * XXX What is even more peculiar is that the ESP
2684 * XXX showed the proper function complete and
2685 * XXX bus service bits in the interrupt register.
2688 case ESP_STEP_FINI4
:
2689 case ESP_STEP_FINI5
:
2690 case ESP_STEP_FINI6
:
2691 case ESP_STEP_FINI7
:
2692 /* Account for the identify message */
2693 if(SCptr
->SCp
.phase
== in_slct_norm
)
2694 cmd_bytes_sent
-= 1;
2696 esp_cmd(esp
, eregs
, ESP_CMD_NULL
);
2698 /* Be careful, we could really get fucked during synchronous
2699 * data transfers if we try to flush the fifo now.
2701 if(!fcnt
&& /* Fifo is empty and... */
2702 /* either we are not doing synchronous transfers or... */
2703 (!esp_dev
->sync_max_offset
||
2704 /* We are not going into data in phase. */
2705 ((esp
->sreg
& ESP_STAT_PMASK
) != ESP_DIP
)))
2706 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
); /* flush is safe */
2708 /* See how far we got if this is not a slow command. */
2709 if(!esp
->esp_slowcmd
) {
2710 if(cmd_bytes_sent
< 0)
2712 if(cmd_bytes_sent
!= SCptr
->cmd_len
) {
2713 /* Crapola, mark it as a slowcmd
2714 * so that we have some chance of
2715 * keeping the command alive with
2718 * XXX Actually, if we didn't send it all
2719 * XXX this means either we didn't set things
2720 * XXX up properly (driver bug) or the target
2721 * XXX or the ESP detected parity on one of
2722 * XXX the command bytes. This makes much
2723 * XXX more sense, and therefore this code
2724 * XXX should be changed to send out a
2725 * XXX parity error message or if the status
2726 * XXX register shows no parity error then
2727 * XXX just expect the target to bring the
2728 * XXX bus into message in phase so that it
2729 * XXX can send us the parity error message.
2732 esp
->esp_slowcmd
= 1;
2733 esp
->esp_scmdp
= &(SCptr
->cmnd
[cmd_bytes_sent
]);
2734 esp
->esp_scmdleft
= (SCptr
->cmd_len
- cmd_bytes_sent
);
2738 /* Now figure out where we went. */
2739 esp_advance_phase(SCptr
, in_the_dark
);
2740 return esp_do_phase_determine(esp
, eregs
);
2743 /* Did the target even make it? */
2744 if(esp
->ireg
== ESP_INTR_DC
) {
2745 /* wheee... nobody there or they didn't like
2746 * what we told it to do, clean up.
2749 /* If anyone is off the bus, but working on
2750 * a command in the background for us, tell
2751 * the ESP to listen for them.
2753 if(esp
->disconnected_SC
)
2754 esp_cmd(esp
, eregs
, ESP_CMD_ESEL
);
2756 if(((1<<SCptr
->device
->id
) & esp
->targets_present
) &&
2757 esp
->seqreg
&& esp
->cur_msgout
[0] == EXTENDED_MESSAGE
&&
2758 (SCptr
->SCp
.phase
== in_slct_msg
||
2759 SCptr
->SCp
.phase
== in_slct_stop
)) {
2762 ESPLOG(("esp%d: Failed synchronous negotiation for target %d "
2763 "lun %d\n", esp
->esp_id
, SCptr
->device
->id
, SCptr
->device
->lun
));
2764 esp_dev
->sync_max_offset
= 0;
2765 esp_dev
->sync_min_period
= 0;
2766 esp_dev
->sync
= 1; /* so we don't negotiate again */
2768 /* Run the command again, this time though we
2769 * won't try to negotiate for synchronous transfers.
2771 * XXX I'd like to do something like send an
2772 * XXX INITIATOR_ERROR or ABORT message to the
2773 * XXX target to tell it, "Sorry I confused you,
2774 * XXX please come back and I will be nicer next
2775 * XXX time". But that requires having the target
2776 * XXX on the bus, and it has dropped BSY on us.
2778 esp
->current_SC
= NULL
;
2779 esp_advance_phase(SCptr
, not_issued
);
2780 prepend_SC(&esp
->issue_SC
, SCptr
);
2785 /* Ok, this is normal, this is what we see during boot
2786 * or whenever when we are scanning the bus for targets.
2787 * But first make sure that is really what is happening.
2789 if(((1<<SCptr
->device
->id
) & esp
->targets_present
)) {
2790 ESPLOG(("esp%d: Warning, live target %d not responding to "
2791 "selection.\n", esp
->esp_id
, SCptr
->device
->id
));
2793 /* This _CAN_ happen. The SCSI standard states that
2794 * the target is to _not_ respond to selection if
2795 * _it_ detects bad parity on the bus for any reason.
2796 * Therefore, we assume that if we've talked successfully
2797 * to this target before, bad parity is the problem.
2799 esp_done(esp
, (DID_PARITY
<< 16));
2801 /* Else, there really isn't anyone there. */
2802 ESPMISC(("esp: selection failure, maybe nobody there?\n"));
2803 ESPMISC(("esp: target %d lun %d\n",
2804 SCptr
->device
->id
, SCptr
->device
->lun
));
2805 esp_done(esp
, (DID_BAD_TARGET
<< 16));
2811 ESPLOG(("esp%d: Selection failure.\n", esp
->esp_id
));
2812 printk("esp%d: Currently -- ", esp
->esp_id
);
2813 esp_print_ireg(esp
->ireg
);
2815 esp_print_statreg(esp
->sreg
);
2817 esp_print_seqreg(esp
->seqreg
);
2819 printk("esp%d: New -- ", esp
->esp_id
);
2820 esp
->sreg
= esp_read(eregs
->esp_status
);
2821 esp
->seqreg
= esp_read(eregs
->esp_sstep
);
2822 esp
->ireg
= esp_read(eregs
->esp_intrpt
);
2823 esp_print_ireg(esp
->ireg
);
2825 esp_print_statreg(esp
->sreg
);
2827 esp_print_seqreg(esp
->seqreg
);
2829 ESPLOG(("esp%d: resetting bus\n", esp
->esp_id
));
2830 return do_reset_bus
; /* ugh... */
2833 /* Continue reading bytes for msgin phase. */
2834 static int esp_do_msgincont(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
2836 if(esp
->ireg
& ESP_INTR_BSERV
) {
2837 /* in the right phase too? */
2838 if((esp
->sreg
& ESP_STAT_PMASK
) == ESP_MIP
) {
2840 esp_cmd(esp
, eregs
, ESP_CMD_TI
);
2841 esp_advance_phase(esp
->current_SC
, in_msgindone
);
2845 /* We changed phase but ESP shows bus service,
2846 * in this case it is most likely that we, the
2847 * hacker who has been up for 20hrs straight
2848 * staring at the screen, drowned in coffee
2849 * smelling like retched cigarette ashes
2850 * have miscoded something..... so, try to
2851 * recover as best we can.
2853 ESPLOG(("esp%d: message in mis-carriage.\n", esp
->esp_id
));
2855 esp_advance_phase(esp
->current_SC
, in_the_dark
);
2856 return do_phase_determine
;
2859 static int check_singlebyte_msg(struct NCR_ESP
*esp
,
2860 struct ESP_regs
*eregs
)
2862 esp
->prevmsgin
= esp
->cur_msgin
[0];
2863 if(esp
->cur_msgin
[0] & 0x80) {
2865 ESPLOG(("esp%d: target sends identify amidst phases\n",
2867 esp_advance_phase(esp
->current_SC
, in_the_dark
);
2869 } else if(((esp
->cur_msgin
[0] & 0xf0) == 0x20) ||
2870 (esp
->cur_msgin
[0] == EXTENDED_MESSAGE
)) {
2872 esp_advance_phase(esp
->current_SC
, in_msgincont
);
2875 esp_advance_phase(esp
->current_SC
, in_the_dark
);
2876 switch(esp
->cur_msgin
[0]) {
2878 /* We don't want to hear about it. */
2879 ESPLOG(("esp%d: msg %02x which we don't know about\n", esp
->esp_id
,
2880 esp
->cur_msgin
[0]));
2881 return MESSAGE_REJECT
;
2884 ESPLOG(("esp%d: target %d sends a nop\n", esp
->esp_id
,
2885 esp
->current_SC
->device
->id
));
2888 case RESTORE_POINTERS
:
2889 /* In this case we might also have to backup the
2890 * "slow command" pointer. It is rare to get such
2891 * a save/restore pointer sequence so early in the
2892 * bus transition sequences, but cover it.
2894 if(esp
->esp_slowcmd
) {
2895 esp
->esp_scmdleft
= esp
->current_SC
->cmd_len
;
2896 esp
->esp_scmdp
= &esp
->current_SC
->cmnd
[0];
2898 esp_restore_pointers(esp
, esp
->current_SC
);
2902 esp_save_pointers(esp
, esp
->current_SC
);
2905 case COMMAND_COMPLETE
:
2907 /* Freeing the bus, let it go. */
2908 esp
->current_SC
->SCp
.phase
= in_freeing
;
2911 case MESSAGE_REJECT
:
2912 ESPMISC(("msg reject, "));
2913 if(esp
->prevmsgout
== EXTENDED_MESSAGE
) {
2914 struct esp_device
*esp_dev
= esp
->current_SC
->device
->hostdata
;
2916 /* Doesn't look like this target can
2917 * do synchronous or WIDE transfers.
2919 ESPSDTR(("got reject, was trying nego, clearing sync/WIDE\n"));
2922 esp_dev
->sync_min_period
= 0;
2923 esp_dev
->sync_max_offset
= 0;
2926 ESPMISC(("not sync nego, sending ABORT\n"));
2932 /* Target negotiates for synchronous transfers before we do, this
2933 * is legal although very strange. What is even funnier is that
2934 * the SCSI2 standard specifically recommends against targets doing
2935 * this because so many initiators cannot cope with this occurring.
2937 static int target_with_ants_in_pants(struct NCR_ESP
*esp
,
2939 struct esp_device
*esp_dev
)
2941 if(esp_dev
->sync
|| SCptr
->device
->borken
) {
2942 /* sorry, no can do */
2943 ESPSDTR(("forcing to async, "));
2944 build_sync_nego_msg(esp
, 0, 0);
2947 ESPLOG(("esp%d: hoping for msgout\n", esp
->esp_id
));
2948 esp_advance_phase(SCptr
, in_the_dark
);
2949 return EXTENDED_MESSAGE
;
2952 /* Ok, we'll check them out... */
2956 static void sync_report(struct NCR_ESP
*esp
)
2961 msg3
= esp
->cur_msgin
[3];
2962 msg4
= esp
->cur_msgin
[4];
2964 int hz
= 1000000000 / (msg3
* 4);
2965 int integer
= hz
/ 1000000;
2966 int fraction
= (hz
- (integer
* 1000000)) / 10000;
2967 if((msg3
* 4) < 200) {
2970 type
= "synchronous";
2973 /* Do not transform this back into one big printk
2974 * again, it triggers a bug in our sparc64-gcc272
2975 * sibling call optimization. -DaveM
2977 ESPLOG((KERN_INFO
"esp%d: target %d ",
2978 esp
->esp_id
, esp
->current_SC
->device
->id
));
2979 ESPLOG(("[period %dns offset %d %d.%02dMHz ",
2980 (int) msg3
* 4, (int) msg4
,
2981 integer
, fraction
));
2982 ESPLOG(("%s SCSI%s]\n", type
,
2983 (((msg3
* 4) < 200) ? "-II" : "")));
2985 ESPLOG((KERN_INFO
"esp%d: target %d asynchronous\n",
2986 esp
->esp_id
, esp
->current_SC
->device
->id
));
2990 static int check_multibyte_msg(struct NCR_ESP
*esp
,
2991 struct ESP_regs
*eregs
)
2993 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
2994 struct esp_device
*esp_dev
= SCptr
->device
->hostdata
;
2996 int message_out
= 0;
2998 ESPSDTR(("chk multibyte msg: "));
2999 if(esp
->cur_msgin
[2] == EXTENDED_SDTR
) {
3000 int period
= esp
->cur_msgin
[3];
3001 int offset
= esp
->cur_msgin
[4];
3003 ESPSDTR(("is sync nego response, "));
3007 /* Target negotiates first! */
3008 ESPSDTR(("target jumps the gun, "));
3009 message_out
= EXTENDED_MESSAGE
; /* we must respond */
3010 rval
= target_with_ants_in_pants(esp
, SCptr
, esp_dev
);
3015 ESPSDTR(("examining sdtr, "));
3017 /* Offset cannot be larger than ESP fifo size. */
3019 ESPSDTR(("offset too big %2x, ", offset
));
3021 ESPSDTR(("sending back new offset\n"));
3022 build_sync_nego_msg(esp
, period
, offset
);
3023 return EXTENDED_MESSAGE
;
3026 if(offset
&& period
> esp
->max_period
) {
3027 /* Yeee, async for this slow device. */
3028 ESPSDTR(("period too long %2x, ", period
));
3029 build_sync_nego_msg(esp
, 0, 0);
3030 ESPSDTR(("hoping for msgout\n"));
3031 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3032 return EXTENDED_MESSAGE
;
3033 } else if (offset
&& period
< esp
->min_period
) {
3034 ESPSDTR(("period too short %2x, ", period
));
3035 period
= esp
->min_period
;
3036 if(esp
->erev
> esp236
)
3043 ESPSDTR(("period is ok, "));
3044 tmp
= esp
->ccycle
/ 1000;
3045 regval
= (((period
<< 2) + tmp
- 1) / tmp
);
3046 if(regval
&& (esp
->erev
> esp236
)) {
3055 esp_dev
->sync_min_period
= (regval
& 0x1f);
3056 esp_dev
->sync_max_offset
= (offset
| esp
->radelay
);
3057 if(esp
->erev
> esp236
) {
3058 if(esp
->erev
== fas100a
)
3059 bit
= ESP_CONFIG3_FAST
;
3061 bit
= ESP_CONFIG3_FSCSI
;
3063 esp
->config3
[SCptr
->device
->id
] |= bit
;
3065 esp
->config3
[SCptr
->device
->id
] &= ~bit
;
3066 esp
->prev_cfg3
= esp
->config3
[SCptr
->device
->id
];
3067 esp_write(eregs
->esp_cfg3
, esp
->prev_cfg3
);
3069 esp
->prev_soff
= esp_dev
->sync_min_period
;
3070 esp_write(eregs
->esp_soff
, esp
->prev_soff
);
3071 esp
->prev_stp
= esp_dev
->sync_max_offset
;
3072 esp_write(eregs
->esp_stp
, esp
->prev_stp
);
3074 ESPSDTR(("soff=%2x stp=%2x cfg3=%2x\n",
3075 esp_dev
->sync_max_offset
,
3076 esp_dev
->sync_min_period
,
3077 esp
->config3
[SCptr
->device
->id
]));
3080 } else if(esp_dev
->sync_max_offset
) {
3083 /* back to async mode */
3084 ESPSDTR(("unaccaptable sync nego, forcing async\n"));
3085 esp_dev
->sync_max_offset
= 0;
3086 esp_dev
->sync_min_period
= 0;
3088 esp_write(eregs
->esp_soff
, 0);
3090 esp_write(eregs
->esp_stp
, 0);
3091 if(esp
->erev
> esp236
) {
3092 if(esp
->erev
== fas100a
)
3093 bit
= ESP_CONFIG3_FAST
;
3095 bit
= ESP_CONFIG3_FSCSI
;
3096 esp
->config3
[SCptr
->device
->id
] &= ~bit
;
3097 esp
->prev_cfg3
= esp
->config3
[SCptr
->device
->id
];
3098 esp_write(eregs
->esp_cfg3
, esp
->prev_cfg3
);
3104 ESPSDTR(("chk multibyte msg: sync is known, "));
3108 ESPLOG(("esp%d: sending sdtr back, hoping for msgout\n",
3110 build_sync_nego_msg(esp
, period
, offset
);
3111 esp_advance_phase(SCptr
, in_the_dark
);
3112 return EXTENDED_MESSAGE
;
3115 ESPSDTR(("returning zero\n"));
3116 esp_advance_phase(SCptr
, in_the_dark
); /* ...or else! */
3118 } else if(esp
->cur_msgin
[2] == EXTENDED_WDTR
) {
3119 ESPLOG(("esp%d: AIEEE wide msg received\n", esp
->esp_id
));
3120 message_out
= MESSAGE_REJECT
;
3121 } else if(esp
->cur_msgin
[2] == EXTENDED_MODIFY_DATA_POINTER
) {
3122 ESPLOG(("esp%d: rejecting modify data ptr msg\n", esp
->esp_id
));
3123 message_out
= MESSAGE_REJECT
;
3125 esp_advance_phase(SCptr
, in_the_dark
);
3129 static int esp_do_msgindone(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
3131 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
3132 int message_out
= 0, it
= 0, rval
;
3134 rval
= skipahead1(esp
, eregs
, SCptr
, in_msgin
, in_msgindone
);
3137 if(SCptr
->SCp
.sent_command
!= in_status
) {
3138 if(!(esp
->ireg
& ESP_INTR_DC
)) {
3139 if(esp
->msgin_len
&& (esp
->sreg
& ESP_STAT_PERR
)) {
3140 message_out
= MSG_PARITY_ERROR
;
3141 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
3142 } else if((it
= (esp_read(eregs
->esp_fflags
) & ESP_FF_FBYTES
))!=1) {
3143 /* We certainly dropped the ball somewhere. */
3144 message_out
= INITIATOR_ERROR
;
3145 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
3146 } else if(!esp
->msgin_len
) {
3147 it
= esp_read(eregs
->esp_fdata
);
3148 esp_advance_phase(SCptr
, in_msgincont
);
3150 /* it is ok and we want it */
3151 it
= esp
->cur_msgin
[esp
->msgin_ctr
] =
3152 esp_read(eregs
->esp_fdata
);
3156 esp_advance_phase(SCptr
, in_the_dark
);
3160 it
= esp
->cur_msgin
[0];
3162 if(!message_out
&& esp
->msgin_len
) {
3163 if(esp
->msgin_ctr
< esp
->msgin_len
) {
3164 esp_advance_phase(SCptr
, in_msgincont
);
3165 } else if(esp
->msgin_len
== 1) {
3166 message_out
= check_singlebyte_msg(esp
, eregs
);
3167 } else if(esp
->msgin_len
== 2) {
3168 if(esp
->cur_msgin
[0] == EXTENDED_MESSAGE
) {
3170 message_out
= MESSAGE_REJECT
;
3172 esp
->msgin_len
= (it
+ 2);
3173 esp_advance_phase(SCptr
, in_msgincont
);
3176 message_out
= MESSAGE_REJECT
; /* foo on you */
3179 message_out
= check_multibyte_msg(esp
, eregs
);
3182 if(message_out
< 0) {
3183 return -message_out
;
3184 } else if(message_out
) {
3185 if(((message_out
!= 1) &&
3186 ((message_out
< 0x20) || (message_out
& 0x80))))
3187 esp
->msgout_len
= 1;
3188 esp
->cur_msgout
[0] = message_out
;
3189 esp_cmd(esp
, eregs
, ESP_CMD_SATN
);
3190 esp_advance_phase(SCptr
, in_the_dark
);
3193 esp
->sreg
= esp_read(eregs
->esp_status
);
3194 esp
->sreg
&= ~(ESP_STAT_INTR
);
3195 if((esp
->sreg
& (ESP_STAT_PMSG
|ESP_STAT_PCD
)) == (ESP_STAT_PMSG
|ESP_STAT_PCD
))
3196 esp_cmd(esp
, eregs
, ESP_CMD_MOK
);
3197 if((SCptr
->SCp
.sent_command
== in_msgindone
) &&
3198 (SCptr
->SCp
.phase
== in_freeing
))
3199 return esp_do_freebus(esp
, eregs
);
3203 static int esp_do_cmdbegin(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
3206 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
3208 esp_advance_phase(SCptr
, in_cmdend
);
3209 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
3210 tmp
= *esp
->esp_scmdp
++;
3211 esp
->esp_scmdleft
--;
3212 esp_write(eregs
->esp_fdata
, tmp
);
3213 esp_cmd(esp
, eregs
, ESP_CMD_TI
);
3217 static int esp_do_cmddone(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
3219 esp_cmd(esp
, eregs
, ESP_CMD_NULL
);
3220 if(esp
->ireg
& ESP_INTR_BSERV
) {
3221 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3222 return esp_do_phase_determine(esp
, eregs
);
3224 ESPLOG(("esp%d: in do_cmddone() but didn't get BSERV interrupt.\n",
3226 return do_reset_bus
;
3229 static int esp_do_msgout(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
3231 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
3232 switch(esp
->msgout_len
) {
3234 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[0]);
3235 esp_cmd(esp
, eregs
, ESP_CMD_TI
);
3239 if(esp
->do_pio_cmds
){
3240 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[0]);
3241 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[1]);
3242 esp_cmd(esp
, eregs
, ESP_CMD_TI
);
3244 esp
->esp_command
[0] = esp
->cur_msgout
[0];
3245 esp
->esp_command
[1] = esp
->cur_msgout
[1];
3246 esp
->dma_setup(esp
, esp
->esp_command_dvma
, 2, 0);
3247 esp_setcount(eregs
, 2);
3248 esp_cmd(esp
, eregs
, ESP_CMD_DMA
| ESP_CMD_TI
);
3254 if(esp
->do_pio_cmds
){
3255 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[0]);
3256 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[1]);
3257 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[2]);
3258 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[3]);
3259 esp_cmd(esp
, eregs
, ESP_CMD_TI
);
3261 esp
->esp_command
[0] = esp
->cur_msgout
[0];
3262 esp
->esp_command
[1] = esp
->cur_msgout
[1];
3263 esp
->esp_command
[2] = esp
->cur_msgout
[2];
3264 esp
->esp_command
[3] = esp
->cur_msgout
[3];
3265 esp
->dma_setup(esp
, esp
->esp_command_dvma
, 4, 0);
3266 esp_setcount(eregs
, 4);
3267 esp_cmd(esp
, eregs
, ESP_CMD_DMA
| ESP_CMD_TI
);
3273 if(esp
->do_pio_cmds
){
3274 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[0]);
3275 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[1]);
3276 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[2]);
3277 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[3]);
3278 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[4]);
3279 esp_cmd(esp
, eregs
, ESP_CMD_TI
);
3281 esp
->esp_command
[0] = esp
->cur_msgout
[0];
3282 esp
->esp_command
[1] = esp
->cur_msgout
[1];
3283 esp
->esp_command
[2] = esp
->cur_msgout
[2];
3284 esp
->esp_command
[3] = esp
->cur_msgout
[3];
3285 esp
->esp_command
[4] = esp
->cur_msgout
[4];
3286 esp
->dma_setup(esp
, esp
->esp_command_dvma
, 5, 0);
3287 esp_setcount(eregs
, 5);
3288 esp_cmd(esp
, eregs
, ESP_CMD_DMA
| ESP_CMD_TI
);
3294 ESPMISC(("bogus msgout sending NOP\n"));
3295 esp
->cur_msgout
[0] = NOP
;
3296 esp_write(eregs
->esp_fdata
, esp
->cur_msgout
[0]);
3297 esp
->msgout_len
= 1;
3298 esp_cmd(esp
, eregs
, ESP_CMD_TI
);
3301 esp_advance_phase(esp
->current_SC
, in_msgoutdone
);
3305 static int esp_do_msgoutdone(struct NCR_ESP
*esp
,
3306 struct ESP_regs
*eregs
)
3308 if((esp
->msgout_len
> 1) && esp
->dma_barrier
)
3309 esp
->dma_barrier(esp
);
3311 if(!(esp
->ireg
& ESP_INTR_DC
)) {
3312 esp_cmd(esp
, eregs
, ESP_CMD_NULL
);
3313 switch(esp
->sreg
& ESP_STAT_PMASK
) {
3315 /* whoops, parity error */
3316 ESPLOG(("esp%d: still in msgout, parity error assumed\n",
3318 if(esp
->msgout_len
> 1)
3319 esp_cmd(esp
, eregs
, ESP_CMD_SATN
);
3320 esp_advance_phase(esp
->current_SC
, in_msgout
);
3327 if(!fcount(esp
, eregs
) &&
3328 !(((struct esp_device
*)esp
->current_SC
->device
->hostdata
)->sync_max_offset
))
3329 esp_cmd(esp
, eregs
, ESP_CMD_FLUSH
);
3335 /* If we sent out a synchronous negotiation message, update
3338 if(esp
->cur_msgout
[2] == EXTENDED_MESSAGE
&&
3339 esp
->cur_msgout
[4] == EXTENDED_SDTR
) {
3340 esp
->snip
= 1; /* anal retentiveness... */
3343 esp
->prevmsgout
= esp
->cur_msgout
[0];
3344 esp
->msgout_len
= 0;
3345 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3346 return esp_do_phase_determine(esp
, eregs
);
3349 static int esp_bus_unexpected(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
3351 ESPLOG(("esp%d: command in weird state %2x\n",
3352 esp
->esp_id
, esp
->current_SC
->SCp
.phase
));
3353 return do_reset_bus
;
3356 static espfunc_t bus_vector
[] = {
3369 esp_do_phase_determine
,
3375 /* This is the second tier in our dual-level SCSI state machine. */
3376 static int esp_work_bus(struct NCR_ESP
*esp
, struct ESP_regs
*eregs
)
3378 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
3381 ESPBUS(("esp_work_bus: "));
3383 ESPBUS(("reconnect\n"));
3384 return esp_do_reconnect(esp
, eregs
);
3386 phase
= SCptr
->SCp
.phase
;
3387 if ((phase
& 0xf0) == in_phases_mask
)
3388 return bus_vector
[(phase
& 0x0f)](esp
, eregs
);
3389 else if((phase
& 0xf0) == in_slct_mask
)
3390 return esp_select_complete(esp
, eregs
);
3392 return esp_bus_unexpected(esp
, eregs
);
3395 static espfunc_t isvc_vector
[] = {
3397 esp_do_phase_determine
,
3403 /* Main interrupt handler for an esp adapter. */
3404 void esp_handle(struct NCR_ESP
*esp
)
3406 struct ESP_regs
*eregs
;
3408 int what_next
= do_intr_end
;
3410 SCptr
= esp
->current_SC
;
3412 if(esp
->dma_irq_entry
)
3413 esp
->dma_irq_entry(esp
);
3415 /* Check for errors. */
3416 esp
->sreg
= esp_read(eregs
->esp_status
);
3417 esp
->sreg
&= (~ESP_STAT_INTR
);
3418 esp
->seqreg
= (esp_read(eregs
->esp_sstep
) & ESP_STEP_VBITS
);
3419 esp
->ireg
= esp_read(eregs
->esp_intrpt
); /* Unlatch intr and stat regs */
3420 ESPIRQ(("handle_irq: [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
3421 esp
->sreg
, esp
->seqreg
, esp
->ireg
));
3422 if(esp
->sreg
& (ESP_STAT_SPAM
)) {
3423 /* Gross error, could be due to one of:
3425 * - top of fifo overwritten, could be because
3426 * we tried to do a synchronous transfer with
3427 * an offset greater than ESP fifo size
3429 * - top of command register overwritten
3431 * - DMA setup to go in one direction, SCSI
3432 * bus points in the other, whoops
3434 * - weird phase change during asynchronous
3435 * data phase while we are initiator
3437 ESPLOG(("esp%d: Gross error sreg=%2x\n", esp
->esp_id
, esp
->sreg
));
3439 /* If a command is live on the bus we cannot safely
3440 * reset the bus, so we'll just let the pieces fall
3441 * where they may. Here we are hoping that the
3442 * target will be able to cleanly go away soon
3443 * so we can safely reset things.
3446 ESPLOG(("esp%d: No current cmd during gross error, "
3447 "resetting bus\n", esp
->esp_id
));
3448 what_next
= do_reset_bus
;
3453 /* No current cmd is only valid at this point when there are
3454 * commands off the bus or we are trying a reset.
3456 if(!SCptr
&& !esp
->disconnected_SC
&& !(esp
->ireg
& ESP_INTR_SR
)) {
3457 /* Panic is safe, since current_SC is null. */
3458 ESPLOG(("esp%d: no command in esp_handle()\n", esp
->esp_id
));
3459 panic("esp_handle: current_SC == penguin within interrupt!");
3462 if(esp
->ireg
& (ESP_INTR_IC
)) {
3463 /* Illegal command fed to ESP. Outside of obvious
3464 * software bugs that could cause this, there is
3465 * a condition with ESP100 where we can confuse the
3466 * ESP into an erroneous illegal command interrupt
3467 * because it does not scrape the FIFO properly
3468 * for reselection. See esp100_reconnect_hwbug()
3469 * to see how we try very hard to avoid this.
3471 ESPLOG(("esp%d: invalid command\n", esp
->esp_id
));
3473 esp_dump_state(esp
, eregs
);
3476 /* Devices with very buggy firmware can drop BSY
3477 * during a scatter list interrupt when using sync
3478 * mode transfers. We continue the transfer as
3479 * expected, the target drops the bus, the ESP
3480 * gets confused, and we get a illegal command
3481 * interrupt because the bus is in the disconnected
3482 * state now and ESP_CMD_TI is only allowed when
3483 * a nexus is alive on the bus.
3485 ESPLOG(("esp%d: Forcing async and disabling disconnect for "
3486 "target %d\n", esp
->esp_id
, SCptr
->device
->id
));
3487 SCptr
->device
->borken
= 1; /* foo on you */
3490 what_next
= do_reset_bus
;
3491 } else if(!(esp
->ireg
& ~(ESP_INTR_FDONE
| ESP_INTR_BSERV
| ESP_INTR_DC
))) {
3495 phase
= SCptr
->SCp
.phase
;
3496 if(phase
& in_phases_mask
) {
3497 what_next
= esp_work_bus(esp
, eregs
);
3498 } else if(phase
& in_slct_mask
) {
3499 what_next
= esp_select_complete(esp
, eregs
);
3501 ESPLOG(("esp%d: interrupt for no good reason...\n",
3503 what_next
= do_intr_end
;
3506 ESPLOG(("esp%d: BSERV or FDONE or DC while SCptr==NULL\n",
3508 what_next
= do_reset_bus
;
3510 } else if(esp
->ireg
& ESP_INTR_SR
) {
3511 ESPLOG(("esp%d: SCSI bus reset interrupt\n", esp
->esp_id
));
3512 what_next
= do_reset_complete
;
3513 } else if(esp
->ireg
& (ESP_INTR_S
| ESP_INTR_SATN
)) {
3514 ESPLOG(("esp%d: AIEEE we have been selected by another initiator!\n",
3516 what_next
= do_reset_bus
;
3517 } else if(esp
->ireg
& ESP_INTR_RSEL
) {
3520 what_next
= esp_do_reconnect(esp
, eregs
);
3521 } else if(SCptr
->SCp
.phase
& in_slct_mask
) {
3522 /* Only selection code knows how to clean
3525 ESPDISC(("Reselected during selection attempt\n"));
3526 what_next
= esp_select_complete(esp
, eregs
);
3528 ESPLOG(("esp%d: Reselected while bus is busy\n",
3530 what_next
= do_reset_bus
;
3534 /* This is tier-one in our dual level SCSI state machine. */
3536 while(what_next
!= do_intr_end
) {
3537 if (what_next
>= do_phase_determine
&&
3538 what_next
< do_intr_end
)
3539 what_next
= isvc_vector
[what_next
](esp
, eregs
);
3541 /* state is completely lost ;-( */
3542 ESPLOG(("esp%d: interrupt engine loses state, resetting bus\n",
3544 what_next
= do_reset_bus
;
3547 if(esp
->dma_irq_exit
)
3548 esp
->dma_irq_exit(esp
);
3552 irqreturn_t
esp_intr(int irq
, void *dev_id
, struct pt_regs
*pregs
)
3554 struct NCR_ESP
*esp
;
3555 unsigned long flags
;
3557 struct Scsi_Host
*dev
= dev_id
;
3559 /* Handle all ESP interrupts showing at this IRQ level. */
3560 spin_lock_irqsave(dev
->host_lock
, flags
);
3565 if(((esp
)->irq
& 0xff) == irq
) {
3567 if(esp
->dma_irq_p(esp
)) {
3570 esp
->dma_ints_off(esp
);
3572 ESPIRQ(("I%d(", esp
->esp_id
));
3576 esp
->dma_ints_on(esp
);
3584 spin_unlock_irqrestore(dev
->host_lock
, flags
);
3588 /* For SMP we only service one ESP on the list list at our IRQ level! */
3589 irqreturn_t
esp_intr(int irq
, void *dev_id
, struct pt_regs
*pregs
)
3591 struct NCR_ESP
*esp
;
3592 unsigned long flags
;
3593 struct Scsi_Host
*dev
= dev_id
;
3595 /* Handle all ESP interrupts showing at this IRQ level. */
3596 spin_lock_irqsave(dev
->host_lock
, flags
);
3598 if(((esp
)->irq
& 0xf) == irq
) {
3599 if(esp
->dma_irq_p(esp
)) {
3600 esp
->dma_ints_off(esp
);
3602 ESPIRQ(("I[%d:%d](",
3603 smp_processor_id(), esp
->esp_id
));
3607 esp
->dma_ints_on(esp
);
3613 spin_unlock_irqrestore(dev
->host_lock
, flags
);
3618 int esp_slave_alloc(Scsi_Device
*SDptr
)
3620 struct esp_device
*esp_dev
=
3621 kmalloc(sizeof(struct esp_device
), GFP_ATOMIC
);
3625 memset(esp_dev
, 0, sizeof(struct esp_device
));
3626 SDptr
->hostdata
= esp_dev
;
3630 void esp_slave_destroy(Scsi_Device
*SDptr
)
3632 struct NCR_ESP
*esp
= (struct NCR_ESP
*) SDptr
->host
->hostdata
;
3634 esp
->targets_present
&= ~(1 << SDptr
->id
);
3635 kfree(SDptr
->hostdata
);
3636 SDptr
->hostdata
= NULL
;
3640 int init_module(void) { return 0; }
3641 void cleanup_module(void) {}
3642 void esp_release(void)
3645 esps_running
= esps_in_use
;
3649 EXPORT_SYMBOL(esp_abort
);
3650 EXPORT_SYMBOL(esp_allocate
);
3651 EXPORT_SYMBOL(esp_deallocate
);
3652 EXPORT_SYMBOL(esp_initialize
);
3653 EXPORT_SYMBOL(esp_intr
);
3654 EXPORT_SYMBOL(esp_queue
);
3655 EXPORT_SYMBOL(esp_reset
);
3656 EXPORT_SYMBOL(esp_slave_alloc
);
3657 EXPORT_SYMBOL(esp_slave_destroy
);
3658 EXPORT_SYMBOL(esps_in_use
);
3660 MODULE_LICENSE("GPL");