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/kernel.h>
27 #include <linux/delay.h>
28 #include <linux/types.h>
29 #include <linux/string.h>
30 #include <linux/slab.h>
31 #include <linux/blkdev.h>
32 #include <linux/interrupt.h>
33 #include <linux/proc_fs.h>
34 #include <linux/stat.h>
35 #include <linux/init.h>
38 #include <scsi/scsi_host.h>
41 #include <asm/system.h>
42 #include <asm/ptrace.h>
43 #include <asm/pgtable.h>
47 /* Command phase enumeration. */
49 not_issued = 0x00, /* Still in the issue_SC queue. */
51 /* Various forms of selecting a target. */
52 #define in_slct_mask 0x10
53 in_slct_norm = 0x10, /* ESP is arbitrating, normal selection */
54 in_slct_stop = 0x11, /* ESP will select, then stop with IRQ */
55 in_slct_msg = 0x12, /* select, then send a message */
56 in_slct_tag = 0x13, /* select and send tagged queue msg */
57 in_slct_sneg = 0x14, /* select and acquire sync capabilities */
59 /* Any post selection activity. */
60 #define in_phases_mask 0x20
61 in_datain = 0x20, /* Data is transferring from the bus */
62 in_dataout = 0x21, /* Data is transferring to the bus */
63 in_data_done = 0x22, /* Last DMA data operation done (maybe) */
64 in_msgin = 0x23, /* Eating message from target */
65 in_msgincont = 0x24, /* Eating more msg bytes from target */
66 in_msgindone = 0x25, /* Decide what to do with what we got */
67 in_msgout = 0x26, /* Sending message to target */
68 in_msgoutdone = 0x27, /* Done sending msg out */
69 in_cmdbegin = 0x28, /* Sending cmd after abnormal selection */
70 in_cmdend = 0x29, /* Done sending slow cmd */
71 in_status = 0x2a, /* Was in status phase, finishing cmd */
72 in_freeing = 0x2b, /* freeing the bus for cmd cmplt or disc */
73 in_the_dark = 0x2c, /* Don't know what bus phase we are in */
75 /* Special states, ie. not normal bus transitions... */
76 #define in_spec_mask 0x80
77 in_abortone = 0x80, /* Aborting one command currently */
78 in_abortall = 0x81, /* Blowing away all commands we have */
79 in_resetdev = 0x82, /* SCSI target reset in progress */
80 in_resetbus = 0x83, /* SCSI bus reset in progress */
81 in_tgterror = 0x84, /* Target did something stupid */
85 /* Zero has special meaning, see skipahead[12]. */
88 /*1*/ do_phase_determine,
90 /*3*/ do_reset_complete,
95 /* The master ring of all esp hosts we are managing in this driver. */
96 static struct NCR_ESP *espchain;
97 int nesps = 0, esps_in_use = 0, esps_running = 0;
99 irqreturn_t esp_intr(int irq, void *dev_id, struct pt_regs *pregs);
101 /* Debugging routines */
102 static struct esp_cmdstrings {
105 } esp_cmd_strings[] = {
107 { ESP_CMD_NULL, "ESP_NOP", },
108 { ESP_CMD_FLUSH, "FIFO_FLUSH", },
109 { ESP_CMD_RC, "RSTESP", },
110 { ESP_CMD_RS, "RSTSCSI", },
111 /* Disconnected State Group */
112 { ESP_CMD_RSEL, "RESLCTSEQ", },
113 { ESP_CMD_SEL, "SLCTNATN", },
114 { ESP_CMD_SELA, "SLCTATN", },
115 { ESP_CMD_SELAS, "SLCTATNSTOP", },
116 { ESP_CMD_ESEL, "ENSLCTRESEL", },
117 { ESP_CMD_DSEL, "DISSELRESEL", },
118 { ESP_CMD_SA3, "SLCTATN3", },
119 { ESP_CMD_RSEL3, "RESLCTSEQ", },
120 /* Target State Group */
121 { ESP_CMD_SMSG, "SNDMSG", },
122 { ESP_CMD_SSTAT, "SNDSTATUS", },
123 { ESP_CMD_SDATA, "SNDDATA", },
124 { ESP_CMD_DSEQ, "DISCSEQ", },
125 { ESP_CMD_TSEQ, "TERMSEQ", },
126 { ESP_CMD_TCCSEQ, "TRGTCMDCOMPSEQ", },
127 { ESP_CMD_DCNCT, "DISC", },
128 { ESP_CMD_RMSG, "RCVMSG", },
129 { ESP_CMD_RCMD, "RCVCMD", },
130 { ESP_CMD_RDATA, "RCVDATA", },
131 { ESP_CMD_RCSEQ, "RCVCMDSEQ", },
132 /* Initiator State Group */
133 { ESP_CMD_TI, "TRANSINFO", },
134 { ESP_CMD_ICCSEQ, "INICMDSEQCOMP", },
135 { ESP_CMD_MOK, "MSGACCEPTED", },
136 { ESP_CMD_TPAD, "TPAD", },
137 { ESP_CMD_SATN, "SATN", },
138 { ESP_CMD_RATN, "RATN", },
140 #define NUM_ESP_COMMANDS ((sizeof(esp_cmd_strings)) / (sizeof(struct esp_cmdstrings)))
142 /* Print textual representation of an ESP command */
143 static inline void esp_print_cmd(unchar espcmd)
145 unchar dma_bit = espcmd & ESP_CMD_DMA;
149 for(i=0; i<NUM_ESP_COMMANDS; i++)
150 if(esp_cmd_strings[i].cmdchar == espcmd)
152 if(i==NUM_ESP_COMMANDS)
153 printk("ESP_Unknown");
155 printk("%s%s", esp_cmd_strings[i].text,
156 ((dma_bit) ? "+DMA" : ""));
159 /* Print the status register's value */
160 static inline void esp_print_statreg(unchar statreg)
165 phase = statreg & ESP_STAT_PMASK;
166 printk("%s,", (phase == ESP_DOP ? "DATA-OUT" :
167 (phase == ESP_DIP ? "DATA-IN" :
168 (phase == ESP_CMDP ? "COMMAND" :
169 (phase == ESP_STATP ? "STATUS" :
170 (phase == ESP_MOP ? "MSG-OUT" :
171 (phase == ESP_MIP ? "MSG_IN" :
173 if(statreg & ESP_STAT_TDONE)
174 printk("TRANS_DONE,");
175 if(statreg & ESP_STAT_TCNT)
176 printk("TCOUNT_ZERO,");
177 if(statreg & ESP_STAT_PERR)
179 if(statreg & ESP_STAT_SPAM)
181 if(statreg & ESP_STAT_INTR)
186 /* Print the interrupt register's value */
187 static inline void esp_print_ireg(unchar intreg)
190 if(intreg & ESP_INTR_S)
191 printk("SLCT_NATN ");
192 if(intreg & ESP_INTR_SATN)
194 if(intreg & ESP_INTR_RSEL)
196 if(intreg & ESP_INTR_FDONE)
198 if(intreg & ESP_INTR_BSERV)
200 if(intreg & ESP_INTR_DC)
202 if(intreg & ESP_INTR_IC)
204 if(intreg & ESP_INTR_SR)
205 printk("SCSI_BUS_RESET ");
209 /* Print the sequence step registers contents */
210 static inline void esp_print_seqreg(unchar stepreg)
212 stepreg &= ESP_STEP_VBITS;
214 (stepreg == ESP_STEP_ASEL ? "SLCT_ARB_CMPLT" :
215 (stepreg == ESP_STEP_SID ? "1BYTE_MSG_SENT" :
216 (stepreg == ESP_STEP_NCMD ? "NOT_IN_CMD_PHASE" :
217 (stepreg == ESP_STEP_PPC ? "CMD_BYTES_LOST" :
218 (stepreg == ESP_STEP_FINI4 ? "CMD_SENT_OK" :
222 static char *phase_string(int phase)
278 #ifdef DEBUG_STATE_MACHINE
279 static inline void esp_advance_phase(Scsi_Cmnd *s, int newphase)
281 ESPLOG(("<%s>", phase_string(newphase)));
282 s->SCp.sent_command = s->SCp.phase;
283 s->SCp.phase = newphase;
286 #define esp_advance_phase(__s, __newphase) \
287 (__s)->SCp.sent_command = (__s)->SCp.phase; \
288 (__s)->SCp.phase = (__newphase);
291 #ifdef DEBUG_ESP_CMDS
292 static inline void esp_cmd(struct NCR_ESP *esp, struct ESP_regs *eregs,
295 esp->espcmdlog[esp->espcmdent] = cmd;
296 esp->espcmdent = (esp->espcmdent + 1) & 31;
297 esp_write(eregs->esp_cmnd, cmd);
300 #define esp_cmd(__esp, __eregs, __cmd) esp_write((__eregs)->esp_cmnd, (__cmd))
303 /* How we use the various Linux SCSI data structures for operation.
307 * We keep track of the syncronous capabilities of a target
308 * in the device member, using sync_min_period and
309 * sync_max_offset. These are the values we directly write
310 * into the ESP registers while running a command. If offset
311 * is zero the ESP will use asynchronous transfers.
312 * If the borken flag is set we assume we shouldn't even bother
313 * trying to negotiate for synchronous transfer as this target
314 * is really stupid. If we notice the target is dropping the
315 * bus, and we have been allowing it to disconnect, we clear
316 * the disconnect flag.
319 /* Manipulation of the ESP command queues. Thanks to the aha152x driver
320 * and its author, Juergen E. Fischer, for the methods used here.
321 * Note that these are per-ESP queues, not global queues like
322 * the aha152x driver uses.
324 static inline void append_SC(Scsi_Cmnd **SC, Scsi_Cmnd *new_SC)
328 new_SC->host_scribble = (unsigned char *) NULL;
332 for(end=*SC;end->host_scribble;end=(Scsi_Cmnd *)end->host_scribble)
334 end->host_scribble = (unsigned char *) new_SC;
338 static inline void prepend_SC(Scsi_Cmnd **SC, Scsi_Cmnd *new_SC)
340 new_SC->host_scribble = (unsigned char *) *SC;
344 static inline Scsi_Cmnd *remove_first_SC(Scsi_Cmnd **SC)
350 *SC = (Scsi_Cmnd *) (*SC)->host_scribble;
354 static inline Scsi_Cmnd *remove_SC(Scsi_Cmnd **SC, int target, int lun)
356 Scsi_Cmnd *ptr, *prev;
358 for(ptr = *SC, prev = NULL;
359 ptr && ((ptr->device->id != target) || (ptr->device->lun != lun));
360 prev = ptr, ptr = (Scsi_Cmnd *) ptr->host_scribble)
364 prev->host_scribble=ptr->host_scribble;
366 *SC=(Scsi_Cmnd *)ptr->host_scribble;
371 /* Resetting various pieces of the ESP scsi driver chipset */
373 /* Reset the ESP chip, _not_ the SCSI bus. */
374 static void esp_reset_esp(struct NCR_ESP *esp, struct ESP_regs *eregs)
376 int family_code, version, i;
379 /* Now reset the ESP chip */
380 esp_cmd(esp, eregs, ESP_CMD_RC);
381 esp_cmd(esp, eregs, ESP_CMD_NULL | ESP_CMD_DMA);
382 if(esp->erev == fast)
383 esp_write(eregs->esp_cfg2, ESP_CONFIG2_FENAB);
384 esp_cmd(esp, eregs, ESP_CMD_NULL | ESP_CMD_DMA);
386 /* This is the only point at which it is reliable to read
387 * the ID-code for a fast ESP chip variant.
389 esp->max_period = ((35 * esp->ccycle) / 1000);
390 if(esp->erev == fast) {
391 char *erev2string[] = {
397 "Symbios Logic 53CF9x-2",
401 version = esp_read(eregs->esp_uid);
402 family_code = (version & 0xf8) >> 3;
403 if(family_code == 0x02) {
404 if ((version & 7) == 2)
408 } else if(family_code == 0x0a)
409 esp->erev = fas366; /* Version is usually '5'. */
410 else if(family_code == 0x00) {
411 if ((version & 7) == 2)
412 esp->erev = fas100a; /* NCR53C9X */
414 esp->erev = espunknown;
415 } else if(family_code == 0x14) {
416 if ((version & 7) == 2)
419 esp->erev = espunknown;
420 } else if(family_code == 0x00) {
421 if ((version & 7) == 2)
422 esp->erev = fas100a; /* NCR53C9X */
424 esp->erev = espunknown;
426 esp->erev = espunknown;
427 ESPLOG(("esp%d: FAST chip is %s (family=%d, version=%d)\n",
428 esp->esp_id, erev2string[esp->erev - fas236],
429 family_code, (version & 7)));
431 esp->min_period = ((4 * esp->ccycle) / 1000);
433 esp->min_period = ((5 * esp->ccycle) / 1000);
436 /* Reload the configuration registers */
437 esp_write(eregs->esp_cfact, esp->cfact);
439 esp_write(eregs->esp_stp, 0);
441 esp_write(eregs->esp_soff, 0);
442 esp_write(eregs->esp_timeo, esp->neg_defp);
443 esp->max_period = (esp->max_period + 3)>>2;
444 esp->min_period = (esp->min_period + 3)>>2;
446 esp_write(eregs->esp_cfg1, esp->config1);
452 esp_write(eregs->esp_cfg2, esp->config2);
456 esp_write(eregs->esp_cfg2, esp->config2);
457 esp->prev_cfg3 = esp->config3[0];
458 esp_write(eregs->esp_cfg3, esp->prev_cfg3);
461 panic("esp: FAS366 support not present, please notify "
462 "jongk@cs.utwente.nl");
467 /* Fast ESP variants */
468 esp_write(eregs->esp_cfg2, esp->config2);
470 esp->config3[i] |= ESP_CONFIG3_FCLK;
471 esp->prev_cfg3 = esp->config3[0];
472 esp_write(eregs->esp_cfg3, esp->prev_cfg3);
477 /* Different timeout constant for these chips */
479 FSC_NEG_DEFP(esp->cfreq,
480 (esp->cfact == ESP_CCF_F0 ?
481 ESP_CCF_F7 + 1 : esp->cfact));
482 esp_write(eregs->esp_timeo, esp->neg_defp);
483 /* Enable Active Negotiation if possible */
484 if((esp->erev == fsc) && !esp->diff)
485 esp_write(eregs->esp_cfg4, ESP_CONFIG4_EAN);
489 esp_write(eregs->esp_cfg2, esp->config2);
491 esp->config3[i] |= ESP_CONFIG3_FCLOCK;
492 esp->prev_cfg3 = esp->config3[0];
493 esp_write(eregs->esp_cfg3, esp->prev_cfg3);
497 panic("esp: what could it be... I wonder...");
501 /* Eat any bitrot in the chip */
502 trash = esp_read(eregs->esp_intrpt);
506 /* This places the ESP into a known state at boot time. */
507 void esp_bootup_reset(struct NCR_ESP *esp, struct ESP_regs *eregs)
509 volatile unchar trash;
516 esp_reset_esp(esp, eregs);
518 /* Reset the SCSI bus, but tell ESP not to generate an irq */
519 esp_write(eregs->esp_cfg1, (esp_read(eregs->esp_cfg1) | ESP_CONFIG1_SRRDISAB));
520 esp_cmd(esp, eregs, ESP_CMD_RS);
522 esp_write(eregs->esp_cfg1, esp->config1);
524 /* Eat any bitrot in the chip and we are done... */
525 trash = esp_read(eregs->esp_intrpt);
528 /* Allocate structure and insert basic data such as SCSI chip frequency
529 * data and a pointer to the device
531 struct NCR_ESP* esp_allocate(struct scsi_host_template *tpnt, void *esp_dev)
533 struct NCR_ESP *esp, *elink;
534 struct Scsi_Host *esp_host;
536 esp_host = scsi_register(tpnt, sizeof(struct NCR_ESP));
538 panic("Cannot register ESP SCSI host");
539 esp = (struct NCR_ESP *) esp_host->hostdata;
541 panic("No esp in hostdata");
542 esp->ehost = esp_host;
544 esp->esp_id = nesps++;
546 /* Set bitshift value (only used on Amiga with multiple ESPs) */
549 /* Put into the chain of esp chips detected */
552 while(elink->next) elink = elink->next;
562 void esp_deallocate(struct NCR_ESP *esp)
564 struct NCR_ESP *elink;
566 if(espchain == esp) {
569 for(elink = espchain; elink && (elink->next != esp); elink = elink->next);
571 elink->next = esp->next;
576 /* Complete initialization of ESP structure and device
577 * Caller must have initialized appropriate parts of the ESP structure
578 * between the call to esp_allocate and this function.
580 void esp_initialize(struct NCR_ESP *esp)
582 struct ESP_regs *eregs = esp->eregs;
587 /* Check out the clock properties of the chip. */
589 /* This is getting messy but it has to be done
590 * correctly or else you get weird behavior all
591 * over the place. We are trying to basically
592 * figure out three pieces of information.
594 * a) Clock Conversion Factor
596 * This is a representation of the input
597 * crystal clock frequency going into the
598 * ESP on this machine. Any operation whose
599 * timing is longer than 400ns depends on this
600 * value being correct. For example, you'll
601 * get blips for arbitration/selection during
602 * high load or with multiple targets if this
603 * is not set correctly.
605 * b) Selection Time-Out
607 * The ESP isn't very bright and will arbitrate
608 * for the bus and try to select a target
609 * forever if you let it. This value tells
610 * the ESP when it has taken too long to
611 * negotiate and that it should interrupt
612 * the CPU so we can see what happened.
613 * The value is computed as follows (from
614 * NCR/Symbios chip docs).
616 * (Time Out Period) * (Input Clock)
617 * STO = ----------------------------------
618 * (8192) * (Clock Conversion Factor)
620 * You usually want the time out period to be
621 * around 250ms, I think we'll set it a little
622 * bit higher to account for fully loaded SCSI
623 * bus's and slow devices that don't respond so
624 * quickly to selection attempts. (yeah, I know
625 * this is out of spec. but there is a lot of
626 * buggy pieces of firmware out there so bite me)
628 * c) Imperical constants for synchronous offset
629 * and transfer period register values
631 * This entails the smallest and largest sync
632 * period we could ever handle on this ESP.
637 if(fmhz <= (5000000))
640 ccf = (((5000000 - 1) + (fmhz))/(5000000));
641 if(!ccf || ccf > 8) {
642 /* If we can't find anything reasonable,
643 * just assume 20MHZ. This is the clock
644 * frequency of the older sun4c's where I've
645 * been unable to find the clock-frequency
646 * PROM property. All other machines provide
647 * useful values it seems.
652 if(ccf==(ESP_CCF_F7+1))
653 esp->cfact = ESP_CCF_F0;
654 else if(ccf == ESP_CCF_NEVER)
655 esp->cfact = ESP_CCF_F2;
659 esp->ccycle = ESP_MHZ_TO_CYCLE(fmhz);
660 esp->ctick = ESP_TICK(ccf, esp->ccycle);
661 esp->neg_defp = ESP_NEG_DEFP(fmhz, ccf);
662 esp->sync_defp = SYNC_DEFP_SLOW;
664 printk("SCSI ID %d Clk %dMHz CCF=%d TOut %d ",
665 esp->scsi_id, (esp->cfreq / 1000000),
666 ccf, (int) esp->neg_defp);
668 /* Fill in ehost data */
669 esp->ehost->base = (unsigned long)eregs;
670 esp->ehost->this_id = esp->scsi_id;
671 esp->ehost->irq = esp->irq;
674 esp->scsi_id_mask = (1 << esp->scsi_id);
676 /* Probe the revision of this esp */
677 esp->config1 = (ESP_CONFIG1_PENABLE | (esp->scsi_id & 7));
678 esp->config2 = (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY);
679 esp_write(eregs->esp_cfg2, esp->config2);
680 if((esp_read(eregs->esp_cfg2) & ~(ESP_CONFIG2_MAGIC)) !=
681 (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY)) {
682 printk("NCR53C90(esp100)\n");
686 esp_write(eregs->esp_cfg2, 0);
687 esp_write(eregs->esp_cfg3, 5);
688 if(esp_read(eregs->esp_cfg3) != 5) {
689 printk("NCR53C90A(esp100a)\n");
694 for(target=0; target<8; target++)
695 esp->config3[target] = 0;
697 esp_write(eregs->esp_cfg3, 0);
698 if(ccf > ESP_CCF_F5) {
699 printk("NCR53C9XF(espfast)\n");
701 esp->sync_defp = SYNC_DEFP_FAST;
703 printk("NCR53C9x(esp236)\n");
709 /* Initialize the command queues */
710 esp->current_SC = NULL;
711 esp->disconnected_SC = NULL;
712 esp->issue_SC = NULL;
714 /* Clear the state machines. */
715 esp->targets_present = 0;
716 esp->resetting_bus = 0;
719 init_waitqueue_head(&esp->reset_queue);
721 esp->fas_premature_intr_workaround = 0;
722 for(i = 0; i < 32; i++)
723 esp->espcmdlog[i] = 0;
725 for(i = 0; i < 16; i++) {
726 esp->cur_msgout[i] = 0;
727 esp->cur_msgin[i] = 0;
729 esp->prevmsgout = esp->prevmsgin = 0;
730 esp->msgout_len = esp->msgin_len = 0;
732 /* Clear the one behind caches to hold unmatchable values. */
733 esp->prev_soff = esp->prev_stp = esp->prev_cfg3 = 0xff;
735 /* Reset the thing before we try anything... */
736 esp_bootup_reset(esp, eregs);
741 /* The info function will return whatever useful
742 * information the developer sees fit. If not provided, then
743 * the name field will be used instead.
745 const char *esp_info(struct Scsi_Host *host)
749 esp = (struct NCR_ESP *) host->hostdata;
752 return "ESP100 (NCR53C90)";
754 return "ESP100A (NCR53C90A)";
756 return "ESP236 (NCR53C9x)";
758 return "Emulex FAS216";
760 return "Emulex FAS236";
762 return "QLogic FAS366";
766 return "Symbios Logic 53CF9x-2";
768 panic("Bogon ESP revision");
772 /* From Wolfgang Stanglmeier's NCR scsi driver. */
781 static void copy_mem_info(struct info_str *info, char *data, int len)
783 if (info->pos + len > info->length)
784 len = info->length - info->pos;
786 if (info->pos + len < info->offset) {
790 if (info->pos < info->offset) {
791 data += (info->offset - info->pos);
792 len -= (info->offset - info->pos);
796 memcpy(info->buffer + info->pos, data, len);
801 static int copy_info(struct info_str *info, char *fmt, ...)
808 len = vsprintf(buf, fmt, args);
811 copy_mem_info(info, buf, len);
815 static int esp_host_info(struct NCR_ESP *esp, char *ptr, off_t offset, int len)
817 struct scsi_device *sdev;
818 struct info_str info;
823 info.offset = offset;
826 copy_info(&info, "ESP Host Adapter:\n");
827 copy_info(&info, "\tESP Model\t\t");
830 copy_info(&info, "ESP100 (NCR53C90)\n");
833 copy_info(&info, "ESP100A (NCR53C90A)\n");
836 copy_info(&info, "ESP236 (NCR53C9x)\n");
839 copy_info(&info, "Emulex FAS216\n");
842 copy_info(&info, "Emulex FAS236\n");
845 copy_info(&info, "FPESP100A\n");
848 copy_info(&info, "Generic FAST\n");
851 copy_info(&info, "QLogic FAS366\n");
854 copy_info(&info, "Symbios Logic 53C9x-2\n");
858 copy_info(&info, "Unknown!\n");
861 copy_info(&info, "\tLive Targets\t\t[ ");
862 for(i = 0; i < 15; i++) {
863 if(esp->targets_present & (1 << i))
864 copy_info(&info, "%d ", i);
866 copy_info(&info, "]\n\n");
868 /* Now describe the state of each existing target. */
869 copy_info(&info, "Target #\tconfig3\t\tSync Capabilities\tDisconnect\n");
871 shost_for_each_device(sdev, esp->ehost) {
872 struct esp_device *esp_dev = sdev->hostdata;
875 if (!(esp->targets_present & (1 << id)))
878 copy_info(&info, "%d\t\t", id);
879 copy_info(&info, "%08lx\t", esp->config3[id]);
880 copy_info(&info, "[%02lx,%02lx]\t\t\t",
881 esp_dev->sync_max_offset,
882 esp_dev->sync_min_period);
883 copy_info(&info, "%s\n", esp_dev->disconnect ? "yes" : "no");
886 return info.pos > info.offset? info.pos - info.offset : 0;
889 /* ESP proc filesystem code. */
890 int esp_proc_info(struct Scsi_Host *shost, char *buffer, char **start, off_t offset, int length,
893 struct NCR_ESP *esp = (struct NCR_ESP *)shost->hostdata;
896 return -EINVAL; /* not yet */
899 return esp_host_info(esp, buffer, offset, length);
902 static void esp_get_dmabufs(struct NCR_ESP *esp, Scsi_Cmnd *sp)
904 if(sp->use_sg == 0) {
905 sp->SCp.this_residual = sp->request_bufflen;
906 sp->SCp.buffer = (struct scatterlist *) sp->request_buffer;
907 sp->SCp.buffers_residual = 0;
908 if (esp->dma_mmu_get_scsi_one)
909 esp->dma_mmu_get_scsi_one(esp, sp);
912 (char *) virt_to_phys(sp->request_buffer);
914 sp->SCp.buffer = (struct scatterlist *) sp->request_buffer;
915 sp->SCp.buffers_residual = sp->use_sg - 1;
916 sp->SCp.this_residual = sp->SCp.buffer->length;
917 if (esp->dma_mmu_get_scsi_sgl)
918 esp->dma_mmu_get_scsi_sgl(esp, sp);
921 (char *) virt_to_phys((page_address(sp->SCp.buffer->page) + sp->SCp.buffer->offset));
925 static void esp_release_dmabufs(struct NCR_ESP *esp, Scsi_Cmnd *sp)
927 if(sp->use_sg == 0) {
928 if (esp->dma_mmu_release_scsi_one)
929 esp->dma_mmu_release_scsi_one(esp, sp);
931 if (esp->dma_mmu_release_scsi_sgl)
932 esp->dma_mmu_release_scsi_sgl(esp, sp);
936 static void esp_restore_pointers(struct NCR_ESP *esp, Scsi_Cmnd *sp)
938 struct esp_pointers *ep = &esp->data_pointers[scmd_id(sp)];
940 sp->SCp.ptr = ep->saved_ptr;
941 sp->SCp.buffer = ep->saved_buffer;
942 sp->SCp.this_residual = ep->saved_this_residual;
943 sp->SCp.buffers_residual = ep->saved_buffers_residual;
946 static void esp_save_pointers(struct NCR_ESP *esp, Scsi_Cmnd *sp)
948 struct esp_pointers *ep = &esp->data_pointers[scmd_id(sp)];
950 ep->saved_ptr = sp->SCp.ptr;
951 ep->saved_buffer = sp->SCp.buffer;
952 ep->saved_this_residual = sp->SCp.this_residual;
953 ep->saved_buffers_residual = sp->SCp.buffers_residual;
958 * 1) Never ever panic while something is live on the bus.
959 * If there is to be any chance of syncing the disks this
960 * rule is to be obeyed.
962 * 2) Any target that causes a foul condition will no longer
963 * have synchronous transfers done to it, no questions
966 * 3) Keep register accesses to a minimum. Think about some
967 * day when we have Xbus machines this is running on and
968 * the ESP chip is on the other end of the machine on a
969 * different board from the cpu where this is running.
972 /* Fire off a command. We assume the bus is free and that the only
973 * case where we could see an interrupt is where we have disconnected
974 * commands active and they are trying to reselect us.
976 static inline void esp_check_cmd(struct NCR_ESP *esp, Scsi_Cmnd *sp)
978 switch(sp->cmd_len) {
982 esp->esp_slowcmd = 0;
986 esp->esp_slowcmd = 1;
987 esp->esp_scmdleft = sp->cmd_len;
988 esp->esp_scmdp = &sp->cmnd[0];
993 static inline void build_sync_nego_msg(struct NCR_ESP *esp, int period, int offset)
995 esp->cur_msgout[0] = EXTENDED_MESSAGE;
996 esp->cur_msgout[1] = 3;
997 esp->cur_msgout[2] = EXTENDED_SDTR;
998 esp->cur_msgout[3] = period;
999 esp->cur_msgout[4] = offset;
1000 esp->msgout_len = 5;
1003 static void esp_exec_cmd(struct NCR_ESP *esp)
1005 struct ESP_regs *eregs = esp->eregs;
1006 struct esp_device *esp_dev;
1008 struct scsi_device *SDptr;
1009 volatile unchar *cmdp = esp->esp_command;
1010 unsigned char the_esp_command;
1014 /* Hold off if we have disconnected commands and
1015 * an IRQ is showing...
1017 if(esp->disconnected_SC && esp->dma_irq_p(esp))
1020 /* Grab first member of the issue queue. */
1021 SCptr = esp->current_SC = remove_first_SC(&esp->issue_SC);
1023 /* Safe to panic here because current_SC is null. */
1025 panic("esp: esp_exec_cmd and issue queue is NULL");
1027 SDptr = SCptr->device;
1028 esp_dev = SDptr->hostdata;
1029 lun = SCptr->device->lun;
1030 target = SCptr->device->id;
1033 esp->msgout_len = 0;
1035 /* Send it out whole, or piece by piece? The ESP
1036 * only knows how to automatically send out 6, 10,
1037 * and 12 byte commands. I used to think that the
1038 * Linux SCSI code would never throw anything other
1039 * than that to us, but then again there is the
1040 * SCSI generic driver which can send us anything.
1042 esp_check_cmd(esp, SCptr);
1044 /* If arbitration/selection is successful, the ESP will leave
1045 * ATN asserted, causing the target to go into message out
1046 * phase. The ESP will feed the target the identify and then
1047 * the target can only legally go to one of command,
1048 * datain/out, status, or message in phase, or stay in message
1049 * out phase (should we be trying to send a sync negotiation
1050 * message after the identify). It is not allowed to drop
1051 * BSY, but some buggy targets do and we check for this
1052 * condition in the selection complete code. Most of the time
1053 * we'll make the command bytes available to the ESP and it
1054 * will not interrupt us until it finishes command phase, we
1055 * cannot do this for command sizes the ESP does not
1056 * understand and in this case we'll get interrupted right
1057 * when the target goes into command phase.
1059 * It is absolutely _illegal_ in the presence of SCSI-2 devices
1060 * to use the ESP select w/o ATN command. When SCSI-2 devices are
1061 * present on the bus we _must_ always go straight to message out
1062 * phase with an identify message for the target. Being that
1063 * selection attempts in SCSI-1 w/o ATN was an option, doing SCSI-2
1064 * selections should not confuse SCSI-1 we hope.
1068 /* this targets sync is known */
1069 #ifdef CONFIG_SCSI_MAC_ESP
1072 if(esp_dev->disconnect)
1073 *cmdp++ = IDENTIFY(1, lun);
1075 *cmdp++ = IDENTIFY(0, lun);
1077 if(esp->esp_slowcmd) {
1078 the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA);
1079 esp_advance_phase(SCptr, in_slct_stop);
1081 the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA);
1082 esp_advance_phase(SCptr, in_slct_norm);
1084 } else if(!(esp->targets_present & (1<<target)) || !(esp_dev->disconnect)) {
1085 /* After the bootup SCSI code sends both the
1086 * TEST_UNIT_READY and INQUIRY commands we want
1087 * to at least attempt allowing the device to
1090 ESPMISC(("esp: Selecting device for first time. target=%d "
1091 "lun=%d\n", target, SCptr->device->lun));
1092 if(!SDptr->borken && !esp_dev->disconnect)
1093 esp_dev->disconnect = 1;
1095 *cmdp++ = IDENTIFY(0, lun);
1096 esp->prevmsgout = NOP;
1097 esp_advance_phase(SCptr, in_slct_norm);
1098 the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA);
1100 /* Take no chances... */
1101 esp_dev->sync_max_offset = 0;
1102 esp_dev->sync_min_period = 0;
1104 int toshiba_cdrom_hwbug_wkaround = 0;
1106 #ifdef CONFIG_SCSI_MAC_ESP
1107 /* Never allow synchronous transfers (disconnect OK) on
1108 * Macintosh. Well, maybe later when we figured out how to
1109 * do DMA on the machines that support it ...
1111 esp_dev->disconnect = 1;
1112 esp_dev->sync_max_offset = 0;
1113 esp_dev->sync_min_period = 0;
1118 /* We've talked to this guy before,
1119 * but never negotiated. Let's try
1122 if(!SDptr->borken) {
1123 if((SDptr->type == TYPE_ROM) &&
1124 (!strncmp(SDptr->vendor, "TOSHIBA", 7))) {
1125 /* Nice try sucker... */
1126 ESPMISC(("esp%d: Disabling sync for buggy "
1127 "Toshiba CDROM.\n", esp->esp_id));
1128 toshiba_cdrom_hwbug_wkaround = 1;
1129 build_sync_nego_msg(esp, 0, 0);
1131 build_sync_nego_msg(esp, esp->sync_defp, 15);
1134 build_sync_nego_msg(esp, 0, 0);
1139 /* A fix for broken SCSI1 targets, when they disconnect
1140 * they lock up the bus and confuse ESP. So disallow
1141 * disconnects for SCSI1 targets for now until we
1142 * find a better fix.
1144 * Addendum: This is funny, I figured out what was going
1145 * on. The blotzed SCSI1 target would disconnect,
1146 * one of the other SCSI2 targets or both would be
1147 * disconnected as well. The SCSI1 target would
1148 * stay disconnected long enough that we start
1149 * up a command on one of the SCSI2 targets. As
1150 * the ESP is arbitrating for the bus the SCSI1
1151 * target begins to arbitrate as well to reselect
1152 * the ESP. The SCSI1 target refuses to drop it's
1153 * ID bit on the data bus even though the ESP is
1154 * at ID 7 and is the obvious winner for any
1155 * arbitration. The ESP is a poor sport and refuses
1156 * to lose arbitration, it will continue indefinitely
1157 * trying to arbitrate for the bus and can only be
1158 * stopped via a chip reset or SCSI bus reset.
1159 * Therefore _no_ disconnects for SCSI1 targets
1160 * thank you very much. ;-)
1162 if(((SDptr->scsi_level < 3) && (SDptr->type != TYPE_TAPE)) ||
1163 toshiba_cdrom_hwbug_wkaround || SDptr->borken) {
1164 ESPMISC((KERN_INFO "esp%d: Disabling DISCONNECT for target %d "
1165 "lun %d\n", esp->esp_id, SCptr->device->id, SCptr->device->lun));
1166 esp_dev->disconnect = 0;
1167 *cmdp++ = IDENTIFY(0, lun);
1169 *cmdp++ = IDENTIFY(1, lun);
1172 /* ESP fifo is only so big...
1173 * Make this look like a slow command.
1175 esp->esp_slowcmd = 1;
1176 esp->esp_scmdleft = SCptr->cmd_len;
1177 esp->esp_scmdp = &SCptr->cmnd[0];
1179 the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA);
1180 esp_advance_phase(SCptr, in_slct_msg);
1183 if(!esp->esp_slowcmd)
1184 for(i = 0; i < SCptr->cmd_len; i++)
1185 *cmdp++ = SCptr->cmnd[i];
1187 esp_write(eregs->esp_busid, (target & 7));
1188 if (esp->prev_soff != esp_dev->sync_max_offset ||
1189 esp->prev_stp != esp_dev->sync_min_period ||
1190 (esp->erev > esp100a &&
1191 esp->prev_cfg3 != esp->config3[target])) {
1192 esp->prev_soff = esp_dev->sync_max_offset;
1193 esp_write(eregs->esp_soff, esp->prev_soff);
1194 esp->prev_stp = esp_dev->sync_min_period;
1195 esp_write(eregs->esp_stp, esp->prev_stp);
1196 if(esp->erev > esp100a) {
1197 esp->prev_cfg3 = esp->config3[target];
1198 esp_write(eregs->esp_cfg3, esp->prev_cfg3);
1201 i = (cmdp - esp->esp_command);
1203 /* Set up the DMA and ESP counters */
1204 if(esp->do_pio_cmds){
1210 * It seems this is required, at least to clean up
1211 * after failed commands when using PIO mode ...
1213 esp_cmd(esp, eregs, ESP_CMD_FLUSH);
1216 esp_write(eregs->esp_fdata, esp->esp_command[j]);
1217 the_esp_command &= ~ESP_CMD_DMA;
1219 /* Tell ESP to "go". */
1220 esp_cmd(esp, eregs, the_esp_command);
1222 /* Set up the ESP counters */
1223 esp_write(eregs->esp_tclow, i);
1224 esp_write(eregs->esp_tcmed, 0);
1225 esp->dma_init_write(esp, esp->esp_command_dvma, i);
1227 /* Tell ESP to "go". */
1228 esp_cmd(esp, eregs, the_esp_command);
1232 /* Queue a SCSI command delivered from the mid-level Linux SCSI code. */
1233 int esp_queue(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *))
1235 struct NCR_ESP *esp;
1237 /* Set up func ptr and initial driver cmd-phase. */
1238 SCpnt->scsi_done = done;
1239 SCpnt->SCp.phase = not_issued;
1241 esp = (struct NCR_ESP *) SCpnt->device->host->hostdata;
1244 esp->dma_led_on(esp);
1246 /* We use the scratch area. */
1247 ESPQUEUE(("esp_queue: target=%d lun=%d ", SCpnt->device->id, SCpnt->lun));
1248 ESPDISC(("N<%02x,%02x>", SCpnt->device->id, SCpnt->lun));
1250 esp_get_dmabufs(esp, SCpnt);
1251 esp_save_pointers(esp, SCpnt); /* FIXME for tag queueing */
1253 SCpnt->SCp.Status = CHECK_CONDITION;
1254 SCpnt->SCp.Message = 0xff;
1255 SCpnt->SCp.sent_command = 0;
1257 /* Place into our queue. */
1258 if(SCpnt->cmnd[0] == REQUEST_SENSE) {
1259 ESPQUEUE(("RQSENSE\n"));
1260 prepend_SC(&esp->issue_SC, SCpnt);
1263 append_SC(&esp->issue_SC, SCpnt);
1266 /* Run it now if we can. */
1267 if(!esp->current_SC && !esp->resetting_bus)
1273 /* Dump driver state. */
1274 static void esp_dump_cmd(Scsi_Cmnd *SCptr)
1276 ESPLOG(("[tgt<%02x> lun<%02x> "
1277 "pphase<%s> cphase<%s>]",
1278 SCptr->device->id, SCptr->device->lun,
1279 phase_string(SCptr->SCp.sent_command),
1280 phase_string(SCptr->SCp.phase)));
1283 static void esp_dump_state(struct NCR_ESP *esp,
1284 struct ESP_regs *eregs)
1286 Scsi_Cmnd *SCptr = esp->current_SC;
1287 #ifdef DEBUG_ESP_CMDS
1291 ESPLOG(("esp%d: dumping state\n", esp->esp_id));
1293 /* Print DMA status */
1294 esp->dma_dump_state(esp);
1296 ESPLOG(("esp%d: SW [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
1297 esp->esp_id, esp->sreg, esp->seqreg, esp->ireg));
1298 ESPLOG(("esp%d: HW reread [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
1299 esp->esp_id, esp_read(eregs->esp_status), esp_read(eregs->esp_sstep),
1300 esp_read(eregs->esp_intrpt)));
1301 #ifdef DEBUG_ESP_CMDS
1302 printk("esp%d: last ESP cmds [", esp->esp_id);
1303 i = (esp->espcmdent - 1) & 31;
1305 esp_print_cmd(esp->espcmdlog[i]);
1309 esp_print_cmd(esp->espcmdlog[i]);
1313 esp_print_cmd(esp->espcmdlog[i]);
1317 esp_print_cmd(esp->espcmdlog[i]);
1320 #endif /* (DEBUG_ESP_CMDS) */
1323 ESPLOG(("esp%d: current command ", esp->esp_id));
1324 esp_dump_cmd(SCptr);
1327 SCptr = esp->disconnected_SC;
1328 ESPLOG(("esp%d: disconnected ", esp->esp_id));
1330 esp_dump_cmd(SCptr);
1331 SCptr = (Scsi_Cmnd *) SCptr->host_scribble;
1336 /* Abort a command. The host_lock is acquired by caller. */
1337 int esp_abort(Scsi_Cmnd *SCptr)
1339 struct NCR_ESP *esp = (struct NCR_ESP *) SCptr->device->host->hostdata;
1340 struct ESP_regs *eregs = esp->eregs;
1343 ESPLOG(("esp%d: Aborting command\n", esp->esp_id));
1344 esp_dump_state(esp, eregs);
1346 /* Wheee, if this is the current command on the bus, the
1347 * best we can do is assert ATN and wait for msgout phase.
1348 * This should even fix a hung SCSI bus when we lose state
1349 * in the driver and timeout because the eventual phase change
1350 * will cause the ESP to (eventually) give an interrupt.
1352 if(esp->current_SC == SCptr) {
1353 esp->cur_msgout[0] = ABORT;
1354 esp->msgout_len = 1;
1355 esp->msgout_ctr = 0;
1356 esp_cmd(esp, eregs, ESP_CMD_SATN);
1360 /* If it is still in the issue queue then we can safely
1361 * call the completion routine and report abort success.
1363 don = esp->dma_ports_p(esp);
1365 esp->dma_ints_off(esp);
1366 synchronize_irq(esp->irq);
1369 Scsi_Cmnd **prev, *this;
1370 for(prev = (&esp->issue_SC), this = esp->issue_SC;
1372 prev = (Scsi_Cmnd **) &(this->host_scribble),
1373 this = (Scsi_Cmnd *) this->host_scribble) {
1375 *prev = (Scsi_Cmnd *) this->host_scribble;
1376 this->host_scribble = NULL;
1377 esp_release_dmabufs(esp, this);
1378 this->result = DID_ABORT << 16;
1381 esp->dma_ints_on(esp);
1387 /* Yuck, the command to abort is disconnected, it is not
1388 * worth trying to abort it now if something else is live
1389 * on the bus at this time. So, we let the SCSI code wait
1390 * a little bit and try again later.
1392 if(esp->current_SC) {
1394 esp->dma_ints_on(esp);
1398 /* It's disconnected, we have to reconnect to re-establish
1399 * the nexus and tell the device to abort. However, we really
1400 * cannot 'reconnect' per se. Don't try to be fancy, just
1401 * indicate failure, which causes our caller to reset the whole
1406 esp->dma_ints_on(esp);
1410 /* We've sent ESP_CMD_RS to the ESP, the interrupt had just
1411 * arrived indicating the end of the SCSI bus reset. Our job
1412 * is to clean out the command queues and begin re-execution
1413 * of SCSI commands once more.
1415 static int esp_finish_reset(struct NCR_ESP *esp,
1416 struct ESP_regs *eregs)
1418 Scsi_Cmnd *sp = esp->current_SC;
1420 /* Clean up currently executing command, if any. */
1422 esp_release_dmabufs(esp, sp);
1423 sp->result = (DID_RESET << 16);
1425 esp->current_SC = NULL;
1428 /* Clean up disconnected queue, they have been invalidated
1431 if (esp->disconnected_SC) {
1432 while((sp = remove_first_SC(&esp->disconnected_SC)) != NULL) {
1433 esp_release_dmabufs(esp, sp);
1434 sp->result = (DID_RESET << 16);
1439 /* SCSI bus reset is complete. */
1440 esp->resetting_bus = 0;
1441 wake_up(&esp->reset_queue);
1443 /* Ok, now it is safe to get commands going once more. */
1450 static int esp_do_resetbus(struct NCR_ESP *esp,
1451 struct ESP_regs *eregs)
1453 ESPLOG(("esp%d: Resetting scsi bus\n", esp->esp_id));
1454 esp->resetting_bus = 1;
1455 esp_cmd(esp, eregs, ESP_CMD_RS);
1460 /* Reset ESP chip, reset hanging bus, then kill active and
1461 * disconnected commands for targets without soft reset.
1463 * The host_lock is acquired by caller.
1465 int esp_reset(Scsi_Cmnd *SCptr)
1467 struct NCR_ESP *esp = (struct NCR_ESP *) SCptr->device->host->hostdata;
1469 spin_lock_irq(esp->ehost->host_lock);
1470 (void) esp_do_resetbus(esp, esp->eregs);
1471 spin_unlock_irq(esp->ehost->host_lock);
1473 wait_event(esp->reset_queue, (esp->resetting_bus == 0));
1478 /* Internal ESP done function. */
1479 static void esp_done(struct NCR_ESP *esp, int error)
1483 if(esp->current_SC) {
1484 done_SC = esp->current_SC;
1485 esp->current_SC = NULL;
1486 esp_release_dmabufs(esp, done_SC);
1487 done_SC->result = error;
1488 done_SC->scsi_done(done_SC);
1490 /* Bus is free, issue any commands in the queue. */
1491 if(esp->issue_SC && !esp->current_SC)
1494 /* Panic is safe as current_SC is null so we may still
1495 * be able to accept more commands to sync disk buffers.
1497 ESPLOG(("panicing\n"));
1498 panic("esp: done() called with NULL esp->current_SC");
1502 /* Wheee, ESP interrupt engine. */
1504 /* Forward declarations. */
1505 static int esp_do_phase_determine(struct NCR_ESP *esp,
1506 struct ESP_regs *eregs);
1507 static int esp_do_data_finale(struct NCR_ESP *esp, struct ESP_regs *eregs);
1508 static int esp_select_complete(struct NCR_ESP *esp, struct ESP_regs *eregs);
1509 static int esp_do_status(struct NCR_ESP *esp, struct ESP_regs *eregs);
1510 static int esp_do_msgin(struct NCR_ESP *esp, struct ESP_regs *eregs);
1511 static int esp_do_msgindone(struct NCR_ESP *esp, struct ESP_regs *eregs);
1512 static int esp_do_msgout(struct NCR_ESP *esp, struct ESP_regs *eregs);
1513 static int esp_do_cmdbegin(struct NCR_ESP *esp, struct ESP_regs *eregs);
1515 #define sreg_datainp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DIP)
1516 #define sreg_dataoutp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DOP)
1518 /* We try to avoid some interrupts by jumping ahead and see if the ESP
1519 * has gotten far enough yet. Hence the following.
1521 static inline int skipahead1(struct NCR_ESP *esp, struct ESP_regs *eregs,
1522 Scsi_Cmnd *scp, int prev_phase, int new_phase)
1524 if(scp->SCp.sent_command != prev_phase)
1527 if(esp->dma_irq_p(esp)) {
1528 /* Yes, we are able to save an interrupt. */
1529 esp->sreg = (esp_read(eregs->esp_status) & ~(ESP_STAT_INTR));
1530 esp->ireg = esp_read(eregs->esp_intrpt);
1531 if(!(esp->ireg & ESP_INTR_SR))
1534 return do_reset_complete;
1536 /* Ho hum, target is taking forever... */
1537 scp->SCp.sent_command = new_phase; /* so we don't recurse... */
1541 static inline int skipahead2(struct NCR_ESP *esp,
1542 struct ESP_regs *eregs,
1543 Scsi_Cmnd *scp, int prev_phase1, int prev_phase2,
1546 if(scp->SCp.sent_command != prev_phase1 &&
1547 scp->SCp.sent_command != prev_phase2)
1549 if(esp->dma_irq_p(esp)) {
1550 /* Yes, we are able to save an interrupt. */
1551 esp->sreg = (esp_read(eregs->esp_status) & ~(ESP_STAT_INTR));
1552 esp->ireg = esp_read(eregs->esp_intrpt);
1553 if(!(esp->ireg & ESP_INTR_SR))
1556 return do_reset_complete;
1558 /* Ho hum, target is taking forever... */
1559 scp->SCp.sent_command = new_phase; /* so we don't recurse... */
1563 /* Misc. esp helper macros. */
1564 #define esp_setcount(__eregs, __cnt) \
1565 esp_write((__eregs)->esp_tclow, ((__cnt) & 0xff)); \
1566 esp_write((__eregs)->esp_tcmed, (((__cnt) >> 8) & 0xff))
1568 #define esp_getcount(__eregs) \
1569 ((esp_read((__eregs)->esp_tclow)&0xff) | \
1570 ((esp_read((__eregs)->esp_tcmed)&0xff) << 8))
1572 #define fcount(__esp, __eregs) \
1573 (esp_read((__eregs)->esp_fflags) & ESP_FF_FBYTES)
1575 #define fnzero(__esp, __eregs) \
1576 (esp_read((__eregs)->esp_fflags) & ESP_FF_ONOTZERO)
1578 /* XXX speculative nops unnecessary when continuing amidst a data phase
1579 * XXX even on esp100!!! another case of flooding the bus with I/O reg
1582 #define esp_maybe_nop(__esp, __eregs) \
1583 if((__esp)->erev == esp100) \
1584 esp_cmd((__esp), (__eregs), ESP_CMD_NULL)
1586 #define sreg_to_dataphase(__sreg) \
1587 ((((__sreg) & ESP_STAT_PMASK) == ESP_DOP) ? in_dataout : in_datain)
1589 /* The ESP100 when in synchronous data phase, can mistake a long final
1590 * REQ pulse from the target as an extra byte, it places whatever is on
1591 * the data lines into the fifo. For now, we will assume when this
1592 * happens that the target is a bit quirky and we don't want to
1593 * be talking synchronously to it anyways. Regardless, we need to
1594 * tell the ESP to eat the extraneous byte so that we can proceed
1595 * to the next phase.
1597 static inline int esp100_sync_hwbug(struct NCR_ESP *esp, struct ESP_regs *eregs,
1598 Scsi_Cmnd *sp, int fifocnt)
1600 /* Do not touch this piece of code. */
1601 if((!(esp->erev == esp100)) ||
1602 (!(sreg_datainp((esp->sreg = esp_read(eregs->esp_status))) && !fifocnt) &&
1603 !(sreg_dataoutp(esp->sreg) && !fnzero(esp, eregs)))) {
1604 if(sp->SCp.phase == in_dataout)
1605 esp_cmd(esp, eregs, ESP_CMD_FLUSH);
1608 /* Async mode for this guy. */
1609 build_sync_nego_msg(esp, 0, 0);
1611 /* Ack the bogus byte, but set ATN first. */
1612 esp_cmd(esp, eregs, ESP_CMD_SATN);
1613 esp_cmd(esp, eregs, ESP_CMD_MOK);
1618 /* This closes the window during a selection with a reselect pending, because
1619 * we use DMA for the selection process the FIFO should hold the correct
1620 * contents if we get reselected during this process. So we just need to
1621 * ack the possible illegal cmd interrupt pending on the esp100.
1623 static inline int esp100_reconnect_hwbug(struct NCR_ESP *esp,
1624 struct ESP_regs *eregs)
1626 volatile unchar junk;
1628 if(esp->erev != esp100)
1630 junk = esp_read(eregs->esp_intrpt);
1632 if(junk & ESP_INTR_SR)
1637 /* This verifies the BUSID bits during a reselection so that we know which
1638 * target is talking to us.
1640 static inline int reconnect_target(struct NCR_ESP *esp, struct ESP_regs *eregs)
1642 int it, me = esp->scsi_id_mask, targ = 0;
1644 if(2 != fcount(esp, eregs))
1646 it = esp_read(eregs->esp_fdata);
1657 /* This verifies the identify from the target so that we know which lun is
1658 * being reconnected.
1660 static inline int reconnect_lun(struct NCR_ESP *esp, struct ESP_regs *eregs)
1664 if((esp->sreg & ESP_STAT_PMASK) != ESP_MIP)
1666 lun = esp_read(eregs->esp_fdata);
1668 /* Yes, you read this correctly. We report lun of zero
1669 * if we see parity error. ESP reports parity error for
1670 * the lun byte, and this is the only way to hope to recover
1671 * because the target is connected.
1673 if(esp->sreg & ESP_STAT_PERR)
1676 /* Check for illegal bits being set in the lun. */
1677 if((lun & 0x40) || !(lun & 0x80))
1683 /* This puts the driver in a state where it can revitalize a command that
1684 * is being continued due to reselection.
1686 static inline void esp_connect(struct NCR_ESP *esp, struct ESP_regs *eregs,
1689 struct scsi_device *dp = sp->device;
1690 struct esp_device *esp_dev = dp->hostdata;
1692 if(esp->prev_soff != esp_dev->sync_max_offset ||
1693 esp->prev_stp != esp_dev->sync_min_period ||
1694 (esp->erev > esp100a &&
1695 esp->prev_cfg3 != esp->config3[scmd_id(sp)])) {
1696 esp->prev_soff = esp_dev->sync_max_offset;
1697 esp_write(eregs->esp_soff, esp->prev_soff);
1698 esp->prev_stp = esp_dev->sync_min_period;
1699 esp_write(eregs->esp_stp, esp->prev_stp);
1700 if(esp->erev > esp100a) {
1701 esp->prev_cfg3 = esp->config3[scmd_id(sp)];
1702 esp_write(eregs->esp_cfg3, esp->prev_cfg3);
1705 esp->current_SC = sp;
1708 /* This will place the current working command back into the issue queue
1709 * if we are to receive a reselection amidst a selection attempt.
1711 static inline void esp_reconnect(struct NCR_ESP *esp, Scsi_Cmnd *sp)
1713 if(!esp->disconnected_SC)
1714 ESPLOG(("esp%d: Weird, being reselected but disconnected "
1715 "command queue is empty.\n", esp->esp_id));
1717 esp->current_SC = NULL;
1718 sp->SCp.phase = not_issued;
1719 append_SC(&esp->issue_SC, sp);
1722 /* Begin message in phase. */
1723 static int esp_do_msgin(struct NCR_ESP *esp, struct ESP_regs *eregs)
1725 esp_cmd(esp, eregs, ESP_CMD_FLUSH);
1726 esp_maybe_nop(esp, eregs);
1727 esp_cmd(esp, eregs, ESP_CMD_TI);
1730 esp_advance_phase(esp->current_SC, in_msgindone);
1734 static inline void advance_sg(struct NCR_ESP *esp, Scsi_Cmnd *sp)
1737 --sp->SCp.buffers_residual;
1738 sp->SCp.this_residual = sp->SCp.buffer->length;
1739 if (esp->dma_advance_sg)
1740 esp->dma_advance_sg (sp);
1742 sp->SCp.ptr = (char *) virt_to_phys((page_address(sp->SCp.buffer->page) + sp->SCp.buffer->offset));
1746 /* Please note that the way I've coded these routines is that I _always_
1747 * check for a disconnect during any and all information transfer
1748 * phases. The SCSI standard states that the target _can_ cause a BUS
1749 * FREE condition by dropping all MSG/CD/IO/BSY signals. Also note
1750 * that during information transfer phases the target controls every
1751 * change in phase, the only thing the initiator can do is "ask" for
1752 * a message out phase by driving ATN true. The target can, and sometimes
1753 * will, completely ignore this request so we cannot assume anything when
1754 * we try to force a message out phase to abort/reset a target. Most of
1755 * the time the target will eventually be nice and go to message out, so
1756 * we may have to hold on to our state about what we want to tell the target
1757 * for some period of time.
1760 /* I think I have things working here correctly. Even partial transfers
1761 * within a buffer or sub-buffer should not upset us at all no matter
1762 * how bad the target and/or ESP fucks things up.
1764 static int esp_do_data(struct NCR_ESP *esp, struct ESP_regs *eregs)
1766 Scsi_Cmnd *SCptr = esp->current_SC;
1767 int thisphase, hmuch;
1769 ESPDATA(("esp_do_data: "));
1770 esp_maybe_nop(esp, eregs);
1771 thisphase = sreg_to_dataphase(esp->sreg);
1772 esp_advance_phase(SCptr, thisphase);
1773 ESPDATA(("newphase<%s> ", (thisphase == in_datain) ? "DATAIN" : "DATAOUT"));
1774 hmuch = esp->dma_can_transfer(esp, SCptr);
1777 * XXX MSch: cater for PIO transfer here; PIO used if hmuch == 0
1779 if (hmuch) { /* DMA */
1783 ESPDATA(("hmuch<%d> ", hmuch));
1784 esp->current_transfer_size = hmuch;
1785 esp_setcount(eregs, (esp->fas_premature_intr_workaround ?
1786 (hmuch + 0x40) : hmuch));
1787 esp->dma_setup(esp, (__u32)((unsigned long)SCptr->SCp.ptr),
1788 hmuch, (thisphase == in_datain));
1789 ESPDATA(("DMA|TI --> do_intr_end\n"));
1790 esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI);
1799 int oldphase, i = 0; /* or where we left off last time ?? esp->current_data ?? */
1801 unsigned char *p = phys_to_virt((unsigned long)SCptr->SCp.ptr);
1803 oldphase = esp_read(eregs->esp_status) & ESP_STAT_PMASK;
1806 * polled transfer; ugly, can we make this happen in a DRQ
1807 * interrupt handler ??
1808 * requires keeping track of state information in host or
1810 * Problem: I've never seen a DRQ happen on Mac, not even
1811 * with ESP_CMD_DMA ...
1814 /* figure out how much needs to be transferred */
1815 hmuch = SCptr->SCp.this_residual;
1816 ESPDATA(("hmuch<%d> pio ", hmuch));
1817 esp->current_transfer_size = hmuch;
1819 /* tell the ESP ... */
1820 esp_setcount(eregs, hmuch);
1824 int j, fifo_stuck = 0, newphase;
1825 unsigned long timeout;
1827 unsigned long flags;
1833 ESPDATA(( /*"\n"*/ "\r"));
1836 local_irq_save(flags);
1838 if(thisphase == in_datain) {
1840 esp_cmd(esp, eregs, ESP_CMD_TI);
1844 while (!((esp->sreg=esp_read(eregs->esp_status)) & ESP_STAT_INTR) && --timeout)
1847 printk("DRQ datain timeout! \n");
1849 newphase = esp->sreg & ESP_STAT_PMASK;
1851 /* see how much we got ... */
1852 fifocnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES);
1859 ESPDATA(("\rgot %d st %x ph %x", fifocnt, esp->sreg, newphase));
1862 for(j=0;j<fifocnt;j++)
1863 p[i++] = esp_read(eregs->esp_fdata);
1865 ESPDATA(("(%d) ", i));
1867 /* how many to go ?? */
1870 /* break if status phase !! */
1871 if(newphase == ESP_STATP) {
1873 esp->ireg = esp_read(eregs->esp_intrpt);
1878 /* how much will fit ? */
1879 int this_count = MAX_FIFO - fifocnt;
1880 if (this_count > hmuch)
1884 for(j=0;j<this_count;j++)
1885 esp_write(eregs->esp_fdata, p[i++]);
1887 /* how many left if this goes out ?? */
1888 hmuch -= this_count;
1891 esp_cmd(esp, eregs, ESP_CMD_TI);
1893 /* wait for 'got it' */
1895 while (!((esp->sreg=esp_read(eregs->esp_status)) & ESP_STAT_INTR) && --timeout)
1898 printk("DRQ dataout timeout! \n");
1900 newphase = esp->sreg & ESP_STAT_PMASK;
1902 /* need to check how much was sent ?? */
1903 fifocnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES);
1905 ESPDATA(("\rsent %d st %x ph %x", this_count - fifocnt, esp->sreg, newphase));
1907 ESPDATA(("(%d) ", i));
1909 /* break if status phase !! */
1910 if(newphase == ESP_STATP) {
1912 esp->ireg = esp_read(eregs->esp_intrpt);
1919 esp->ireg = esp_read(eregs->esp_intrpt);
1921 ESPDATA(("ir %x ... ", esp->ireg));
1924 ESPDATA(("done! \n"));
1927 local_irq_restore(flags);
1930 /* check new bus phase */
1931 if (newphase != oldphase && i < esp->current_transfer_size) {
1932 /* something happened; disconnect ?? */
1933 ESPDATA(("phase change, dropped out with %d done ... ", i));
1937 /* check int. status */
1938 if (esp->ireg & ESP_INTR_DC) {
1940 ESPDATA(("disconnect; %d transferred ... ", i));
1942 } else if (esp->ireg & ESP_INTR_FDONE) {
1944 ESPDATA(("function done; %d transferred ... ", i));
1948 /* XXX fixme: bail out on stall */
1949 if (fifo_stuck > 10) {
1951 ESPDATA(("fifo stall; %d transferred ... ", i));
1957 /* check successful completion ?? */
1959 if (thisphase == in_dataout)
1960 hmuch += fifocnt; /* stuck?? adjust data pointer ...*/
1962 /* tell do_data_finale how much was transferred */
1963 esp->current_transfer_size -= hmuch;
1965 /* still not completely sure on this one ... */
1966 return /*do_intr_end*/ do_work_bus /*do_phase_determine*/ ;
1975 /* See how successful the data transfer was. */
1976 static int esp_do_data_finale(struct NCR_ESP *esp,
1977 struct ESP_regs *eregs)
1979 Scsi_Cmnd *SCptr = esp->current_SC;
1980 struct esp_device *esp_dev = SCptr->device->hostdata;
1981 int bogus_data = 0, bytes_sent = 0, fifocnt, ecount = 0;
1983 if(esp->dma_led_off)
1984 esp->dma_led_off(esp);
1986 ESPDATA(("esp_do_data_finale: "));
1988 if(SCptr->SCp.phase == in_datain) {
1989 if(esp->sreg & ESP_STAT_PERR) {
1990 /* Yuck, parity error. The ESP asserts ATN
1991 * so that we can go to message out phase
1992 * immediately and inform the target that
1993 * something bad happened.
1995 ESPLOG(("esp%d: data bad parity detected.\n",
1997 esp->cur_msgout[0] = INITIATOR_ERROR;
1998 esp->msgout_len = 1;
2001 esp->dma_drain(esp);
2003 if(esp->dma_invalidate)
2004 esp->dma_invalidate(esp);
2006 /* This could happen for the above parity error case. */
2007 if(!(esp->ireg == ESP_INTR_BSERV)) {
2008 /* Please go to msgout phase, please please please... */
2009 ESPLOG(("esp%d: !BSERV after data, probably to msgout\n",
2011 return esp_do_phase_determine(esp, eregs);
2014 /* Check for partial transfers and other horrible events. */
2015 fifocnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES);
2016 ecount = esp_getcount(eregs);
2017 if(esp->fas_premature_intr_workaround)
2019 bytes_sent = esp->current_transfer_size;
2021 ESPDATA(("trans_sz=%d, ", bytes_sent));
2022 if(!(esp->sreg & ESP_STAT_TCNT))
2023 bytes_sent -= ecount;
2024 if(SCptr->SCp.phase == in_dataout)
2025 bytes_sent -= fifocnt;
2027 ESPDATA(("bytes_sent=%d (ecount=%d, fifocnt=%d), ", bytes_sent,
2030 /* If we were in synchronous mode, check for peculiarities. */
2031 if(esp_dev->sync_max_offset)
2032 bogus_data = esp100_sync_hwbug(esp, eregs, SCptr, fifocnt);
2034 esp_cmd(esp, eregs, ESP_CMD_FLUSH);
2036 /* Until we are sure of what has happened, we are certainly
2039 esp_advance_phase(SCptr, in_the_dark);
2041 /* Check for premature interrupt condition. Can happen on FAS2x6
2042 * chips. QLogic recommends a workaround by overprogramming the
2043 * transfer counters, but this makes doing scatter-gather impossible.
2044 * Until there is a way to disable scatter-gather for a single target,
2045 * and not only for the entire host adapter as it is now, the workaround
2046 * is way to expensive performance wise.
2047 * Instead, it turns out that when this happens the target has disconnected
2048 * already but it doesn't show in the interrupt register. Compensate for
2049 * that here to try and avoid a SCSI bus reset.
2051 if(!esp->fas_premature_intr_workaround && (fifocnt == 1) &&
2052 sreg_dataoutp(esp->sreg)) {
2053 ESPLOG(("esp%d: Premature interrupt, enabling workaround\n",
2056 /* Disable scatter-gather operations, they are not possible
2057 * when using this workaround.
2059 esp->ehost->sg_tablesize = 0;
2060 esp->ehost->use_clustering = ENABLE_CLUSTERING;
2061 esp->fas_premature_intr_workaround = 1;
2064 ESPLOG(("esp%d: Aborting scatter-gather operation\n",
2066 esp->cur_msgout[0] = ABORT;
2067 esp->msgout_len = 1;
2068 esp->msgout_ctr = 0;
2069 esp_cmd(esp, eregs, ESP_CMD_SATN);
2070 esp_setcount(eregs, 0xffff);
2071 esp_cmd(esp, eregs, ESP_CMD_NULL);
2072 esp_cmd(esp, eregs, ESP_CMD_TPAD | ESP_CMD_DMA);
2076 /* Just set the disconnected bit. That's what appears to
2077 * happen anyway. The state machine will pick it up when
2080 esp->ireg |= ESP_INTR_DC;
2084 if(bytes_sent < 0) {
2085 /* I've seen this happen due to lost state in this
2086 * driver. No idea why it happened, but allowing
2087 * this value to be negative caused things to
2088 * lock up. This allows greater chance of recovery.
2089 * In fact every time I've seen this, it has been
2090 * a driver bug without question.
2092 ESPLOG(("esp%d: yieee, bytes_sent < 0!\n", esp->esp_id));
2093 ESPLOG(("esp%d: csz=%d fifocount=%d ecount=%d\n",
2095 esp->current_transfer_size, fifocnt, ecount));
2096 ESPLOG(("esp%d: use_sg=%d ptr=%p this_residual=%d\n",
2098 SCptr->use_sg, SCptr->SCp.ptr, SCptr->SCp.this_residual));
2099 ESPLOG(("esp%d: Forcing async for target %d\n", esp->esp_id,
2100 SCptr->device->id));
2101 SCptr->device->borken = 1;
2106 /* Update the state of our transfer. */
2107 SCptr->SCp.ptr += bytes_sent;
2108 SCptr->SCp.this_residual -= bytes_sent;
2109 if(SCptr->SCp.this_residual < 0) {
2111 ESPLOG(("esp%d: Data transfer overrun.\n", esp->esp_id));
2112 SCptr->SCp.this_residual = 0;
2115 /* Maybe continue. */
2117 ESPDATA(("!bogus_data, "));
2118 /* NO MATTER WHAT, we advance the scatterlist,
2119 * if the target should decide to disconnect
2120 * in between scatter chunks (which is common)
2121 * we could die horribly! I used to have the sg
2122 * advance occur only if we are going back into
2123 * (or are staying in) a data phase, you can
2124 * imagine the hell I went through trying to
2127 if(!SCptr->SCp.this_residual && SCptr->SCp.buffers_residual)
2128 advance_sg(esp, SCptr);
2129 #ifdef DEBUG_ESP_DATA
2130 if(sreg_datainp(esp->sreg) || sreg_dataoutp(esp->sreg)) {
2131 ESPDATA(("to more data\n"));
2133 ESPDATA(("to new phase\n"));
2136 return esp_do_phase_determine(esp, eregs);
2138 /* Bogus data, just wait for next interrupt. */
2139 ESPLOG(("esp%d: bogus_data during end of data phase\n",
2144 /* We received a non-good status return at the end of
2145 * running a SCSI command. This is used to decide if
2146 * we should clear our synchronous transfer state for
2147 * such a device when that happens.
2149 * The idea is that when spinning up a disk or rewinding
2150 * a tape, we don't want to go into a loop re-negotiating
2151 * synchronous capabilities over and over.
2153 static int esp_should_clear_sync(Scsi_Cmnd *sp)
2155 unchar cmd = sp->cmnd[0];
2157 /* These cases are for spinning up a disk and
2158 * waiting for that spinup to complete.
2160 if(cmd == START_STOP)
2163 if(cmd == TEST_UNIT_READY)
2166 /* One more special case for SCSI tape drives,
2167 * this is what is used to probe the device for
2168 * completion of a rewind or tape load operation.
2170 if(sp->device->type == TYPE_TAPE && cmd == MODE_SENSE)
2176 /* Either a command is completing or a target is dropping off the bus
2177 * to continue the command in the background so we can do other work.
2179 static int esp_do_freebus(struct NCR_ESP *esp, struct ESP_regs *eregs)
2181 Scsi_Cmnd *SCptr = esp->current_SC;
2184 rval = skipahead2(esp, eregs, SCptr, in_status, in_msgindone, in_freeing);
2188 if(esp->ireg != ESP_INTR_DC) {
2189 ESPLOG(("esp%d: Target will not disconnect\n", esp->esp_id));
2190 return do_reset_bus; /* target will not drop BSY... */
2192 esp->msgout_len = 0;
2193 esp->prevmsgout = NOP;
2194 if(esp->prevmsgin == COMMAND_COMPLETE) {
2195 struct esp_device *esp_dev = SCptr->device->hostdata;
2196 /* Normal end of nexus. */
2197 if(esp->disconnected_SC)
2198 esp_cmd(esp, eregs, ESP_CMD_ESEL);
2200 if(SCptr->SCp.Status != GOOD &&
2201 SCptr->SCp.Status != CONDITION_GOOD &&
2202 ((1<<scmd_id(SCptr)) & esp->targets_present) &&
2203 esp_dev->sync && esp_dev->sync_max_offset) {
2204 /* SCSI standard says that the synchronous capabilities
2205 * should be renegotiated at this point. Most likely
2206 * we are about to request sense from this target
2207 * in which case we want to avoid using sync
2208 * transfers until we are sure of the current target
2211 ESPMISC(("esp: Status <%d> for target %d lun %d\n",
2212 SCptr->SCp.Status, SCptr->device->id, SCptr->device->lun));
2214 /* But don't do this when spinning up a disk at
2215 * boot time while we poll for completion as it
2216 * fills up the console with messages. Also, tapes
2217 * can report not ready many times right after
2218 * loading up a tape.
2220 if(esp_should_clear_sync(SCptr) != 0)
2223 ESPDISC(("F<%02x,%02x>", SCptr->device->id, SCptr->device->lun));
2224 esp_done(esp, ((SCptr->SCp.Status & 0xff) |
2225 ((SCptr->SCp.Message & 0xff)<<8) |
2227 } else if(esp->prevmsgin == DISCONNECT) {
2228 /* Normal disconnect. */
2229 esp_cmd(esp, eregs, ESP_CMD_ESEL);
2230 ESPDISC(("D<%02x,%02x>", SCptr->device->id, SCptr->device->lun));
2231 append_SC(&esp->disconnected_SC, SCptr);
2232 esp->current_SC = NULL;
2236 /* Driver bug, we do not expect a disconnect here
2237 * and should not have advanced the state engine
2240 ESPLOG(("esp%d: last msg not disc and not cmd cmplt.\n",
2242 return do_reset_bus;
2247 /* When a reselect occurs, and we cannot find the command to
2248 * reconnect to in our queues, we do this.
2250 static int esp_bad_reconnect(struct NCR_ESP *esp)
2254 ESPLOG(("esp%d: Eieeee, reconnecting unknown command!\n",
2256 ESPLOG(("QUEUE DUMP\n"));
2258 ESPLOG(("esp%d: issue_SC[", esp->esp_id));
2260 ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun));
2261 sp = (Scsi_Cmnd *) sp->host_scribble;
2264 sp = esp->current_SC;
2265 ESPLOG(("esp%d: current_SC[", esp->esp_id));
2267 ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun));
2268 sp = (Scsi_Cmnd *) sp->host_scribble;
2271 sp = esp->disconnected_SC;
2272 ESPLOG(("esp%d: disconnected_SC[", esp->esp_id));
2274 ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun));
2275 sp = (Scsi_Cmnd *) sp->host_scribble;
2278 return do_reset_bus;
2281 /* Do the needy when a target tries to reconnect to us. */
2282 static int esp_do_reconnect(struct NCR_ESP *esp,
2283 struct ESP_regs *eregs)
2288 /* Check for all bogus conditions first. */
2289 target = reconnect_target(esp, eregs);
2291 ESPDISC(("bad bus bits\n"));
2292 return do_reset_bus;
2294 lun = reconnect_lun(esp, eregs);
2296 ESPDISC(("target=%2x, bad identify msg\n", target));
2297 return do_reset_bus;
2300 /* Things look ok... */
2301 ESPDISC(("R<%02x,%02x>", target, lun));
2303 esp_cmd(esp, eregs, ESP_CMD_FLUSH);
2304 if(esp100_reconnect_hwbug(esp, eregs))
2305 return do_reset_bus;
2306 esp_cmd(esp, eregs, ESP_CMD_NULL);
2308 SCptr = remove_SC(&esp->disconnected_SC, (unchar) target, (unchar) lun);
2310 return esp_bad_reconnect(esp);
2312 esp_connect(esp, eregs, SCptr);
2313 esp_cmd(esp, eregs, ESP_CMD_MOK);
2315 /* Reconnect implies a restore pointers operation. */
2316 esp_restore_pointers(esp, SCptr);
2319 esp_advance_phase(SCptr, in_the_dark);
2323 /* End of NEXUS (hopefully), pick up status + message byte then leave if
2326 static int esp_do_status(struct NCR_ESP *esp, struct ESP_regs *eregs)
2328 Scsi_Cmnd *SCptr = esp->current_SC;
2331 rval = skipahead1(esp, eregs, SCptr, in_the_dark, in_status);
2336 ESPSTAT(("esp_do_status: "));
2337 if(intr != ESP_INTR_DC) {
2338 int message_out = 0; /* for parity problems */
2340 /* Ack the message. */
2341 ESPSTAT(("ack msg, "));
2342 esp_cmd(esp, eregs, ESP_CMD_MOK);
2345 esp->dma_poll(esp, (unsigned char *) esp->esp_command);
2347 ESPSTAT(("got something, "));
2348 /* ESP chimes in with one of
2350 * 1) function done interrupt:
2351 * both status and message in bytes
2354 * 2) bus service interrupt:
2355 * only status byte was acquired
2358 * can't happen, but we test for it
2361 * ALSO: If bad parity was detected on either
2362 * the status _or_ the message byte then
2363 * the ESP has asserted ATN on the bus
2364 * and we must therefore wait for the
2365 * next phase change.
2367 if(intr & ESP_INTR_FDONE) {
2368 /* We got it all, hallejulia. */
2369 ESPSTAT(("got both, "));
2370 SCptr->SCp.Status = esp->esp_command[0];
2371 SCptr->SCp.Message = esp->esp_command[1];
2372 esp->prevmsgin = SCptr->SCp.Message;
2373 esp->cur_msgin[0] = SCptr->SCp.Message;
2374 if(esp->sreg & ESP_STAT_PERR) {
2375 /* There was bad parity for the
2376 * message byte, the status byte
2379 message_out = MSG_PARITY_ERROR;
2381 } else if(intr == ESP_INTR_BSERV) {
2382 /* Only got status byte. */
2383 ESPLOG(("esp%d: got status only, ", esp->esp_id));
2384 if(!(esp->sreg & ESP_STAT_PERR)) {
2385 SCptr->SCp.Status = esp->esp_command[0];
2386 SCptr->SCp.Message = 0xff;
2388 /* The status byte had bad parity.
2389 * we leave the scsi_pointer Status
2390 * field alone as we set it to a default
2391 * of CHECK_CONDITION in esp_queue.
2393 message_out = INITIATOR_ERROR;
2396 /* This shouldn't happen ever. */
2397 ESPSTAT(("got bolixed\n"));
2398 esp_advance_phase(SCptr, in_the_dark);
2399 return esp_do_phase_determine(esp, eregs);
2403 ESPSTAT(("status=%2x msg=%2x, ", SCptr->SCp.Status,
2404 SCptr->SCp.Message));
2405 if(SCptr->SCp.Message == COMMAND_COMPLETE) {
2406 ESPSTAT(("and was COMMAND_COMPLETE\n"));
2407 esp_advance_phase(SCptr, in_freeing);
2408 return esp_do_freebus(esp, eregs);
2410 ESPLOG(("esp%d: and _not_ COMMAND_COMPLETE\n",
2412 esp->msgin_len = esp->msgin_ctr = 1;
2413 esp_advance_phase(SCptr, in_msgindone);
2414 return esp_do_msgindone(esp, eregs);
2417 /* With luck we'll be able to let the target
2418 * know that bad parity happened, it will know
2419 * which byte caused the problems and send it
2420 * again. For the case where the status byte
2421 * receives bad parity, I do not believe most
2422 * targets recover very well. We'll see.
2424 ESPLOG(("esp%d: bad parity somewhere mout=%2x\n",
2425 esp->esp_id, message_out));
2426 esp->cur_msgout[0] = message_out;
2427 esp->msgout_len = esp->msgout_ctr = 1;
2428 esp_advance_phase(SCptr, in_the_dark);
2429 return esp_do_phase_determine(esp, eregs);
2432 /* If we disconnect now, all hell breaks loose. */
2433 ESPLOG(("esp%d: whoops, disconnect\n", esp->esp_id));
2434 esp_advance_phase(SCptr, in_the_dark);
2435 return esp_do_phase_determine(esp, eregs);
2439 static int esp_enter_status(struct NCR_ESP *esp,
2440 struct ESP_regs *eregs)
2442 unchar thecmd = ESP_CMD_ICCSEQ;
2444 esp_cmd(esp, eregs, ESP_CMD_FLUSH);
2446 if(esp->do_pio_cmds) {
2447 esp_advance_phase(esp->current_SC, in_status);
2448 esp_cmd(esp, eregs, thecmd);
2449 while(!(esp_read(esp->eregs->esp_status) & ESP_STAT_INTR));
2450 esp->esp_command[0] = esp_read(eregs->esp_fdata);
2451 while(!(esp_read(esp->eregs->esp_status) & ESP_STAT_INTR));
2452 esp->esp_command[1] = esp_read(eregs->esp_fdata);
2454 esp->esp_command[0] = esp->esp_command[1] = 0xff;
2455 esp_write(eregs->esp_tclow, 2);
2456 esp_write(eregs->esp_tcmed, 0);
2457 esp->dma_init_read(esp, esp->esp_command_dvma, 2);
2458 thecmd |= ESP_CMD_DMA;
2459 esp_cmd(esp, eregs, thecmd);
2460 esp_advance_phase(esp->current_SC, in_status);
2463 return esp_do_status(esp, eregs);
2466 static int esp_disconnect_amidst_phases(struct NCR_ESP *esp,
2467 struct ESP_regs *eregs)
2469 Scsi_Cmnd *sp = esp->current_SC;
2470 struct esp_device *esp_dev = sp->device->hostdata;
2472 /* This means real problems if we see this
2473 * here. Unless we were actually trying
2474 * to force the device to abort/reset.
2476 ESPLOG(("esp%d: Disconnect amidst phases, ", esp->esp_id));
2477 ESPLOG(("pphase<%s> cphase<%s>, ",
2478 phase_string(sp->SCp.phase),
2479 phase_string(sp->SCp.sent_command)));
2481 if(esp->disconnected_SC)
2482 esp_cmd(esp, eregs, ESP_CMD_ESEL);
2484 switch(esp->cur_msgout[0]) {
2486 /* We didn't expect this to happen at all. */
2487 ESPLOG(("device is bolixed\n"));
2488 esp_advance_phase(sp, in_tgterror);
2489 esp_done(esp, (DID_ERROR << 16));
2492 case BUS_DEVICE_RESET:
2493 ESPLOG(("device reset successful\n"));
2494 esp_dev->sync_max_offset = 0;
2495 esp_dev->sync_min_period = 0;
2497 esp_advance_phase(sp, in_resetdev);
2498 esp_done(esp, (DID_RESET << 16));
2502 ESPLOG(("device abort successful\n"));
2503 esp_advance_phase(sp, in_abortone);
2504 esp_done(esp, (DID_ABORT << 16));
2511 static int esp_enter_msgout(struct NCR_ESP *esp,
2512 struct ESP_regs *eregs)
2514 esp_advance_phase(esp->current_SC, in_msgout);
2515 return esp_do_msgout(esp, eregs);
2518 static int esp_enter_msgin(struct NCR_ESP *esp,
2519 struct ESP_regs *eregs)
2521 esp_advance_phase(esp->current_SC, in_msgin);
2522 return esp_do_msgin(esp, eregs);
2525 static int esp_enter_cmd(struct NCR_ESP *esp,
2526 struct ESP_regs *eregs)
2528 esp_advance_phase(esp->current_SC, in_cmdbegin);
2529 return esp_do_cmdbegin(esp, eregs);
2532 static int esp_enter_badphase(struct NCR_ESP *esp,
2533 struct ESP_regs *eregs)
2535 ESPLOG(("esp%d: Bizarre bus phase %2x.\n", esp->esp_id,
2536 esp->sreg & ESP_STAT_PMASK));
2537 return do_reset_bus;
2540 typedef int (*espfunc_t)(struct NCR_ESP *,
2543 static espfunc_t phase_vector[] = {
2544 esp_do_data, /* ESP_DOP */
2545 esp_do_data, /* ESP_DIP */
2546 esp_enter_cmd, /* ESP_CMDP */
2547 esp_enter_status, /* ESP_STATP */
2548 esp_enter_badphase, /* ESP_STAT_PMSG */
2549 esp_enter_badphase, /* ESP_STAT_PMSG | ESP_STAT_PIO */
2550 esp_enter_msgout, /* ESP_MOP */
2551 esp_enter_msgin, /* ESP_MIP */
2554 /* The target has control of the bus and we have to see where it has
2557 static int esp_do_phase_determine(struct NCR_ESP *esp,
2558 struct ESP_regs *eregs)
2560 if ((esp->ireg & ESP_INTR_DC) != 0)
2561 return esp_disconnect_amidst_phases(esp, eregs);
2562 return phase_vector[esp->sreg & ESP_STAT_PMASK](esp, eregs);
2565 /* First interrupt after exec'ing a cmd comes here. */
2566 static int esp_select_complete(struct NCR_ESP *esp, struct ESP_regs *eregs)
2568 Scsi_Cmnd *SCptr = esp->current_SC;
2569 struct esp_device *esp_dev = SCptr->device->hostdata;
2570 int cmd_bytes_sent, fcnt;
2572 fcnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES);
2573 cmd_bytes_sent = esp->dma_bytes_sent(esp, fcnt);
2574 if(esp->dma_invalidate)
2575 esp->dma_invalidate(esp);
2577 /* Let's check to see if a reselect happened
2578 * while we we're trying to select. This must
2581 if(esp->ireg == (ESP_INTR_RSEL | ESP_INTR_FDONE)) {
2582 esp_reconnect(esp, SCptr);
2583 return esp_do_reconnect(esp, eregs);
2586 /* Looks like things worked, we should see a bus service &
2587 * a function complete interrupt at this point. Note we
2588 * are doing a direct comparison because we don't want to
2589 * be fooled into thinking selection was successful if
2590 * ESP_INTR_DC is set, see below.
2592 if(esp->ireg == (ESP_INTR_FDONE | ESP_INTR_BSERV)) {
2593 /* target speaks... */
2594 esp->targets_present |= (1<<scmd_id(SCptr));
2596 /* What if the target ignores the sdtr? */
2600 /* See how far, if at all, we got in getting
2601 * the information out to the target.
2603 switch(esp->seqreg) {
2607 /* Arbitration won, target selected, but
2608 * we are in some phase which is not command
2609 * phase nor is it message out phase.
2611 * XXX We've confused the target, obviously.
2612 * XXX So clear it's state, but we also end
2613 * XXX up clearing everyone elses. That isn't
2614 * XXX so nice. I'd like to just reset this
2615 * XXX target, but if I cannot even get it's
2616 * XXX attention and finish selection to talk
2617 * XXX to it, there is not much more I can do.
2618 * XXX If we have a loaded bus we're going to
2619 * XXX spend the next second or so renegotiating
2620 * XXX for synchronous transfers.
2622 ESPLOG(("esp%d: STEP_ASEL for tgt %d\n",
2623 esp->esp_id, SCptr->device->id));
2626 /* Arbitration won, target selected, went
2627 * to message out phase, sent one message
2628 * byte, then we stopped. ATN is asserted
2629 * on the SCSI bus and the target is still
2630 * there hanging on. This is a legal
2631 * sequence step if we gave the ESP a select
2634 * XXX See above, I could set the borken flag
2635 * XXX in the device struct and retry the
2636 * XXX command. But would that help for
2637 * XXX tagged capable targets?
2641 /* Arbitration won, target selected, maybe
2642 * sent the one message byte in message out
2643 * phase, but we did not go to command phase
2644 * in the end. Actually, we could have sent
2645 * only some of the message bytes if we tried
2646 * to send out the entire identify and tag
2647 * message using ESP_CMD_SA3.
2653 /* No, not the powerPC pinhead. Arbitration
2654 * won, all message bytes sent if we went to
2655 * message out phase, went to command phase
2656 * but only part of the command was sent.
2658 * XXX I've seen this, but usually in conjunction
2659 * XXX with a gross error which appears to have
2660 * XXX occurred between the time I told the
2661 * XXX ESP to arbitrate and when I got the
2662 * XXX interrupt. Could I have misloaded the
2663 * XXX command bytes into the fifo? Actually,
2664 * XXX I most likely missed a phase, and therefore
2665 * XXX went into never never land and didn't even
2666 * XXX know it. That was the old driver though.
2667 * XXX What is even more peculiar is that the ESP
2668 * XXX showed the proper function complete and
2669 * XXX bus service bits in the interrupt register.
2672 case ESP_STEP_FINI4:
2673 case ESP_STEP_FINI5:
2674 case ESP_STEP_FINI6:
2675 case ESP_STEP_FINI7:
2676 /* Account for the identify message */
2677 if(SCptr->SCp.phase == in_slct_norm)
2678 cmd_bytes_sent -= 1;
2680 esp_cmd(esp, eregs, ESP_CMD_NULL);
2682 /* Be careful, we could really get fucked during synchronous
2683 * data transfers if we try to flush the fifo now.
2685 if(!fcnt && /* Fifo is empty and... */
2686 /* either we are not doing synchronous transfers or... */
2687 (!esp_dev->sync_max_offset ||
2688 /* We are not going into data in phase. */
2689 ((esp->sreg & ESP_STAT_PMASK) != ESP_DIP)))
2690 esp_cmd(esp, eregs, ESP_CMD_FLUSH); /* flush is safe */
2692 /* See how far we got if this is not a slow command. */
2693 if(!esp->esp_slowcmd) {
2694 if(cmd_bytes_sent < 0)
2696 if(cmd_bytes_sent != SCptr->cmd_len) {
2697 /* Crapola, mark it as a slowcmd
2698 * so that we have some chance of
2699 * keeping the command alive with
2702 * XXX Actually, if we didn't send it all
2703 * XXX this means either we didn't set things
2704 * XXX up properly (driver bug) or the target
2705 * XXX or the ESP detected parity on one of
2706 * XXX the command bytes. This makes much
2707 * XXX more sense, and therefore this code
2708 * XXX should be changed to send out a
2709 * XXX parity error message or if the status
2710 * XXX register shows no parity error then
2711 * XXX just expect the target to bring the
2712 * XXX bus into message in phase so that it
2713 * XXX can send us the parity error message.
2716 esp->esp_slowcmd = 1;
2717 esp->esp_scmdp = &(SCptr->cmnd[cmd_bytes_sent]);
2718 esp->esp_scmdleft = (SCptr->cmd_len - cmd_bytes_sent);
2722 /* Now figure out where we went. */
2723 esp_advance_phase(SCptr, in_the_dark);
2724 return esp_do_phase_determine(esp, eregs);
2727 /* Did the target even make it? */
2728 if(esp->ireg == ESP_INTR_DC) {
2729 /* wheee... nobody there or they didn't like
2730 * what we told it to do, clean up.
2733 /* If anyone is off the bus, but working on
2734 * a command in the background for us, tell
2735 * the ESP to listen for them.
2737 if(esp->disconnected_SC)
2738 esp_cmd(esp, eregs, ESP_CMD_ESEL);
2740 if(((1<<SCptr->device->id) & esp->targets_present) &&
2741 esp->seqreg && esp->cur_msgout[0] == EXTENDED_MESSAGE &&
2742 (SCptr->SCp.phase == in_slct_msg ||
2743 SCptr->SCp.phase == in_slct_stop)) {
2746 ESPLOG(("esp%d: Failed synchronous negotiation for target %d "
2747 "lun %d\n", esp->esp_id, SCptr->device->id, SCptr->device->lun));
2748 esp_dev->sync_max_offset = 0;
2749 esp_dev->sync_min_period = 0;
2750 esp_dev->sync = 1; /* so we don't negotiate again */
2752 /* Run the command again, this time though we
2753 * won't try to negotiate for synchronous transfers.
2755 * XXX I'd like to do something like send an
2756 * XXX INITIATOR_ERROR or ABORT message to the
2757 * XXX target to tell it, "Sorry I confused you,
2758 * XXX please come back and I will be nicer next
2759 * XXX time". But that requires having the target
2760 * XXX on the bus, and it has dropped BSY on us.
2762 esp->current_SC = NULL;
2763 esp_advance_phase(SCptr, not_issued);
2764 prepend_SC(&esp->issue_SC, SCptr);
2769 /* Ok, this is normal, this is what we see during boot
2770 * or whenever when we are scanning the bus for targets.
2771 * But first make sure that is really what is happening.
2773 if(((1<<SCptr->device->id) & esp->targets_present)) {
2774 ESPLOG(("esp%d: Warning, live target %d not responding to "
2775 "selection.\n", esp->esp_id, SCptr->device->id));
2777 /* This _CAN_ happen. The SCSI standard states that
2778 * the target is to _not_ respond to selection if
2779 * _it_ detects bad parity on the bus for any reason.
2780 * Therefore, we assume that if we've talked successfully
2781 * to this target before, bad parity is the problem.
2783 esp_done(esp, (DID_PARITY << 16));
2785 /* Else, there really isn't anyone there. */
2786 ESPMISC(("esp: selection failure, maybe nobody there?\n"));
2787 ESPMISC(("esp: target %d lun %d\n",
2788 SCptr->device->id, SCptr->device->lun));
2789 esp_done(esp, (DID_BAD_TARGET << 16));
2795 ESPLOG(("esp%d: Selection failure.\n", esp->esp_id));
2796 printk("esp%d: Currently -- ", esp->esp_id);
2797 esp_print_ireg(esp->ireg);
2799 esp_print_statreg(esp->sreg);
2801 esp_print_seqreg(esp->seqreg);
2803 printk("esp%d: New -- ", esp->esp_id);
2804 esp->sreg = esp_read(eregs->esp_status);
2805 esp->seqreg = esp_read(eregs->esp_sstep);
2806 esp->ireg = esp_read(eregs->esp_intrpt);
2807 esp_print_ireg(esp->ireg);
2809 esp_print_statreg(esp->sreg);
2811 esp_print_seqreg(esp->seqreg);
2813 ESPLOG(("esp%d: resetting bus\n", esp->esp_id));
2814 return do_reset_bus; /* ugh... */
2817 /* Continue reading bytes for msgin phase. */
2818 static int esp_do_msgincont(struct NCR_ESP *esp, struct ESP_regs *eregs)
2820 if(esp->ireg & ESP_INTR_BSERV) {
2821 /* in the right phase too? */
2822 if((esp->sreg & ESP_STAT_PMASK) == ESP_MIP) {
2824 esp_cmd(esp, eregs, ESP_CMD_TI);
2825 esp_advance_phase(esp->current_SC, in_msgindone);
2829 /* We changed phase but ESP shows bus service,
2830 * in this case it is most likely that we, the
2831 * hacker who has been up for 20hrs straight
2832 * staring at the screen, drowned in coffee
2833 * smelling like retched cigarette ashes
2834 * have miscoded something..... so, try to
2835 * recover as best we can.
2837 ESPLOG(("esp%d: message in mis-carriage.\n", esp->esp_id));
2839 esp_advance_phase(esp->current_SC, in_the_dark);
2840 return do_phase_determine;
2843 static int check_singlebyte_msg(struct NCR_ESP *esp,
2844 struct ESP_regs *eregs)
2846 esp->prevmsgin = esp->cur_msgin[0];
2847 if(esp->cur_msgin[0] & 0x80) {
2849 ESPLOG(("esp%d: target sends identify amidst phases\n",
2851 esp_advance_phase(esp->current_SC, in_the_dark);
2853 } else if(((esp->cur_msgin[0] & 0xf0) == 0x20) ||
2854 (esp->cur_msgin[0] == EXTENDED_MESSAGE)) {
2856 esp_advance_phase(esp->current_SC, in_msgincont);
2859 esp_advance_phase(esp->current_SC, in_the_dark);
2860 switch(esp->cur_msgin[0]) {
2862 /* We don't want to hear about it. */
2863 ESPLOG(("esp%d: msg %02x which we don't know about\n", esp->esp_id,
2864 esp->cur_msgin[0]));
2865 return MESSAGE_REJECT;
2868 ESPLOG(("esp%d: target %d sends a nop\n", esp->esp_id,
2869 esp->current_SC->device->id));
2872 case RESTORE_POINTERS:
2873 /* In this case we might also have to backup the
2874 * "slow command" pointer. It is rare to get such
2875 * a save/restore pointer sequence so early in the
2876 * bus transition sequences, but cover it.
2878 if(esp->esp_slowcmd) {
2879 esp->esp_scmdleft = esp->current_SC->cmd_len;
2880 esp->esp_scmdp = &esp->current_SC->cmnd[0];
2882 esp_restore_pointers(esp, esp->current_SC);
2886 esp_save_pointers(esp, esp->current_SC);
2889 case COMMAND_COMPLETE:
2891 /* Freeing the bus, let it go. */
2892 esp->current_SC->SCp.phase = in_freeing;
2895 case MESSAGE_REJECT:
2896 ESPMISC(("msg reject, "));
2897 if(esp->prevmsgout == EXTENDED_MESSAGE) {
2898 struct esp_device *esp_dev = esp->current_SC->device->hostdata;
2900 /* Doesn't look like this target can
2901 * do synchronous or WIDE transfers.
2903 ESPSDTR(("got reject, was trying nego, clearing sync/WIDE\n"));
2906 esp_dev->sync_min_period = 0;
2907 esp_dev->sync_max_offset = 0;
2910 ESPMISC(("not sync nego, sending ABORT\n"));
2916 /* Target negotiates for synchronous transfers before we do, this
2917 * is legal although very strange. What is even funnier is that
2918 * the SCSI2 standard specifically recommends against targets doing
2919 * this because so many initiators cannot cope with this occurring.
2921 static int target_with_ants_in_pants(struct NCR_ESP *esp,
2923 struct esp_device *esp_dev)
2925 if(esp_dev->sync || SCptr->device->borken) {
2926 /* sorry, no can do */
2927 ESPSDTR(("forcing to async, "));
2928 build_sync_nego_msg(esp, 0, 0);
2931 ESPLOG(("esp%d: hoping for msgout\n", esp->esp_id));
2932 esp_advance_phase(SCptr, in_the_dark);
2933 return EXTENDED_MESSAGE;
2936 /* Ok, we'll check them out... */
2940 static void sync_report(struct NCR_ESP *esp)
2945 msg3 = esp->cur_msgin[3];
2946 msg4 = esp->cur_msgin[4];
2948 int hz = 1000000000 / (msg3 * 4);
2949 int integer = hz / 1000000;
2950 int fraction = (hz - (integer * 1000000)) / 10000;
2951 if((msg3 * 4) < 200) {
2954 type = "synchronous";
2957 /* Do not transform this back into one big printk
2958 * again, it triggers a bug in our sparc64-gcc272
2959 * sibling call optimization. -DaveM
2961 ESPLOG((KERN_INFO "esp%d: target %d ",
2962 esp->esp_id, esp->current_SC->device->id));
2963 ESPLOG(("[period %dns offset %d %d.%02dMHz ",
2964 (int) msg3 * 4, (int) msg4,
2965 integer, fraction));
2966 ESPLOG(("%s SCSI%s]\n", type,
2967 (((msg3 * 4) < 200) ? "-II" : "")));
2969 ESPLOG((KERN_INFO "esp%d: target %d asynchronous\n",
2970 esp->esp_id, esp->current_SC->device->id));
2974 static int check_multibyte_msg(struct NCR_ESP *esp,
2975 struct ESP_regs *eregs)
2977 Scsi_Cmnd *SCptr = esp->current_SC;
2978 struct esp_device *esp_dev = SCptr->device->hostdata;
2980 int message_out = 0;
2982 ESPSDTR(("chk multibyte msg: "));
2983 if(esp->cur_msgin[2] == EXTENDED_SDTR) {
2984 int period = esp->cur_msgin[3];
2985 int offset = esp->cur_msgin[4];
2987 ESPSDTR(("is sync nego response, "));
2991 /* Target negotiates first! */
2992 ESPSDTR(("target jumps the gun, "));
2993 message_out = EXTENDED_MESSAGE; /* we must respond */
2994 rval = target_with_ants_in_pants(esp, SCptr, esp_dev);
2999 ESPSDTR(("examining sdtr, "));
3001 /* Offset cannot be larger than ESP fifo size. */
3003 ESPSDTR(("offset too big %2x, ", offset));
3005 ESPSDTR(("sending back new offset\n"));
3006 build_sync_nego_msg(esp, period, offset);
3007 return EXTENDED_MESSAGE;
3010 if(offset && period > esp->max_period) {
3011 /* Yeee, async for this slow device. */
3012 ESPSDTR(("period too long %2x, ", period));
3013 build_sync_nego_msg(esp, 0, 0);
3014 ESPSDTR(("hoping for msgout\n"));
3015 esp_advance_phase(esp->current_SC, in_the_dark);
3016 return EXTENDED_MESSAGE;
3017 } else if (offset && period < esp->min_period) {
3018 ESPSDTR(("period too short %2x, ", period));
3019 period = esp->min_period;
3020 if(esp->erev > esp236)
3027 ESPSDTR(("period is ok, "));
3028 tmp = esp->ccycle / 1000;
3029 regval = (((period << 2) + tmp - 1) / tmp);
3030 if(regval && (esp->erev > esp236)) {
3039 esp_dev->sync_min_period = (regval & 0x1f);
3040 esp_dev->sync_max_offset = (offset | esp->radelay);
3041 if(esp->erev > esp236) {
3042 if(esp->erev == fas100a)
3043 bit = ESP_CONFIG3_FAST;
3045 bit = ESP_CONFIG3_FSCSI;
3047 esp->config3[SCptr->device->id] |= bit;
3049 esp->config3[SCptr->device->id] &= ~bit;
3050 esp->prev_cfg3 = esp->config3[SCptr->device->id];
3051 esp_write(eregs->esp_cfg3, esp->prev_cfg3);
3053 esp->prev_soff = esp_dev->sync_min_period;
3054 esp_write(eregs->esp_soff, esp->prev_soff);
3055 esp->prev_stp = esp_dev->sync_max_offset;
3056 esp_write(eregs->esp_stp, esp->prev_stp);
3058 ESPSDTR(("soff=%2x stp=%2x cfg3=%2x\n",
3059 esp_dev->sync_max_offset,
3060 esp_dev->sync_min_period,
3061 esp->config3[scmd_id(SCptr)]));
3064 } else if(esp_dev->sync_max_offset) {
3067 /* back to async mode */
3068 ESPSDTR(("unaccaptable sync nego, forcing async\n"));
3069 esp_dev->sync_max_offset = 0;
3070 esp_dev->sync_min_period = 0;
3072 esp_write(eregs->esp_soff, 0);
3074 esp_write(eregs->esp_stp, 0);
3075 if(esp->erev > esp236) {
3076 if(esp->erev == fas100a)
3077 bit = ESP_CONFIG3_FAST;
3079 bit = ESP_CONFIG3_FSCSI;
3080 esp->config3[SCptr->device->id] &= ~bit;
3081 esp->prev_cfg3 = esp->config3[SCptr->device->id];
3082 esp_write(eregs->esp_cfg3, esp->prev_cfg3);
3088 ESPSDTR(("chk multibyte msg: sync is known, "));
3092 ESPLOG(("esp%d: sending sdtr back, hoping for msgout\n",
3094 build_sync_nego_msg(esp, period, offset);
3095 esp_advance_phase(SCptr, in_the_dark);
3096 return EXTENDED_MESSAGE;
3099 ESPSDTR(("returning zero\n"));
3100 esp_advance_phase(SCptr, in_the_dark); /* ...or else! */
3102 } else if(esp->cur_msgin[2] == EXTENDED_WDTR) {
3103 ESPLOG(("esp%d: AIEEE wide msg received\n", esp->esp_id));
3104 message_out = MESSAGE_REJECT;
3105 } else if(esp->cur_msgin[2] == EXTENDED_MODIFY_DATA_POINTER) {
3106 ESPLOG(("esp%d: rejecting modify data ptr msg\n", esp->esp_id));
3107 message_out = MESSAGE_REJECT;
3109 esp_advance_phase(SCptr, in_the_dark);
3113 static int esp_do_msgindone(struct NCR_ESP *esp, struct ESP_regs *eregs)
3115 Scsi_Cmnd *SCptr = esp->current_SC;
3116 int message_out = 0, it = 0, rval;
3118 rval = skipahead1(esp, eregs, SCptr, in_msgin, in_msgindone);
3121 if(SCptr->SCp.sent_command != in_status) {
3122 if(!(esp->ireg & ESP_INTR_DC)) {
3123 if(esp->msgin_len && (esp->sreg & ESP_STAT_PERR)) {
3124 message_out = MSG_PARITY_ERROR;
3125 esp_cmd(esp, eregs, ESP_CMD_FLUSH);
3126 } else if((it = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES))!=1) {
3127 /* We certainly dropped the ball somewhere. */
3128 message_out = INITIATOR_ERROR;
3129 esp_cmd(esp, eregs, ESP_CMD_FLUSH);
3130 } else if(!esp->msgin_len) {
3131 it = esp_read(eregs->esp_fdata);
3132 esp_advance_phase(SCptr, in_msgincont);
3134 /* it is ok and we want it */
3135 it = esp->cur_msgin[esp->msgin_ctr] =
3136 esp_read(eregs->esp_fdata);
3140 esp_advance_phase(SCptr, in_the_dark);
3144 it = esp->cur_msgin[0];
3146 if(!message_out && esp->msgin_len) {
3147 if(esp->msgin_ctr < esp->msgin_len) {
3148 esp_advance_phase(SCptr, in_msgincont);
3149 } else if(esp->msgin_len == 1) {
3150 message_out = check_singlebyte_msg(esp, eregs);
3151 } else if(esp->msgin_len == 2) {
3152 if(esp->cur_msgin[0] == EXTENDED_MESSAGE) {
3154 message_out = MESSAGE_REJECT;
3156 esp->msgin_len = (it + 2);
3157 esp_advance_phase(SCptr, in_msgincont);
3160 message_out = MESSAGE_REJECT; /* foo on you */
3163 message_out = check_multibyte_msg(esp, eregs);
3166 if(message_out < 0) {
3167 return -message_out;
3168 } else if(message_out) {
3169 if(((message_out != 1) &&
3170 ((message_out < 0x20) || (message_out & 0x80))))
3171 esp->msgout_len = 1;
3172 esp->cur_msgout[0] = message_out;
3173 esp_cmd(esp, eregs, ESP_CMD_SATN);
3174 esp_advance_phase(SCptr, in_the_dark);
3177 esp->sreg = esp_read(eregs->esp_status);
3178 esp->sreg &= ~(ESP_STAT_INTR);
3179 if((esp->sreg & (ESP_STAT_PMSG|ESP_STAT_PCD)) == (ESP_STAT_PMSG|ESP_STAT_PCD))
3180 esp_cmd(esp, eregs, ESP_CMD_MOK);
3181 if((SCptr->SCp.sent_command == in_msgindone) &&
3182 (SCptr->SCp.phase == in_freeing))
3183 return esp_do_freebus(esp, eregs);
3187 static int esp_do_cmdbegin(struct NCR_ESP *esp, struct ESP_regs *eregs)
3190 Scsi_Cmnd *SCptr = esp->current_SC;
3192 esp_advance_phase(SCptr, in_cmdend);
3193 esp_cmd(esp, eregs, ESP_CMD_FLUSH);
3194 tmp = *esp->esp_scmdp++;
3195 esp->esp_scmdleft--;
3196 esp_write(eregs->esp_fdata, tmp);
3197 esp_cmd(esp, eregs, ESP_CMD_TI);
3201 static int esp_do_cmddone(struct NCR_ESP *esp, struct ESP_regs *eregs)
3203 esp_cmd(esp, eregs, ESP_CMD_NULL);
3204 if(esp->ireg & ESP_INTR_BSERV) {
3205 esp_advance_phase(esp->current_SC, in_the_dark);
3206 return esp_do_phase_determine(esp, eregs);
3208 ESPLOG(("esp%d: in do_cmddone() but didn't get BSERV interrupt.\n",
3210 return do_reset_bus;
3213 static int esp_do_msgout(struct NCR_ESP *esp, struct ESP_regs *eregs)
3215 esp_cmd(esp, eregs, ESP_CMD_FLUSH);
3216 switch(esp->msgout_len) {
3218 esp_write(eregs->esp_fdata, esp->cur_msgout[0]);
3219 esp_cmd(esp, eregs, ESP_CMD_TI);
3223 if(esp->do_pio_cmds){
3224 esp_write(eregs->esp_fdata, esp->cur_msgout[0]);
3225 esp_write(eregs->esp_fdata, esp->cur_msgout[1]);
3226 esp_cmd(esp, eregs, ESP_CMD_TI);
3228 esp->esp_command[0] = esp->cur_msgout[0];
3229 esp->esp_command[1] = esp->cur_msgout[1];
3230 esp->dma_setup(esp, esp->esp_command_dvma, 2, 0);
3231 esp_setcount(eregs, 2);
3232 esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI);
3238 if(esp->do_pio_cmds){
3239 esp_write(eregs->esp_fdata, esp->cur_msgout[0]);
3240 esp_write(eregs->esp_fdata, esp->cur_msgout[1]);
3241 esp_write(eregs->esp_fdata, esp->cur_msgout[2]);
3242 esp_write(eregs->esp_fdata, esp->cur_msgout[3]);
3243 esp_cmd(esp, eregs, ESP_CMD_TI);
3245 esp->esp_command[0] = esp->cur_msgout[0];
3246 esp->esp_command[1] = esp->cur_msgout[1];
3247 esp->esp_command[2] = esp->cur_msgout[2];
3248 esp->esp_command[3] = esp->cur_msgout[3];
3249 esp->dma_setup(esp, esp->esp_command_dvma, 4, 0);
3250 esp_setcount(eregs, 4);
3251 esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI);
3257 if(esp->do_pio_cmds){
3258 esp_write(eregs->esp_fdata, esp->cur_msgout[0]);
3259 esp_write(eregs->esp_fdata, esp->cur_msgout[1]);
3260 esp_write(eregs->esp_fdata, esp->cur_msgout[2]);
3261 esp_write(eregs->esp_fdata, esp->cur_msgout[3]);
3262 esp_write(eregs->esp_fdata, esp->cur_msgout[4]);
3263 esp_cmd(esp, eregs, ESP_CMD_TI);
3265 esp->esp_command[0] = esp->cur_msgout[0];
3266 esp->esp_command[1] = esp->cur_msgout[1];
3267 esp->esp_command[2] = esp->cur_msgout[2];
3268 esp->esp_command[3] = esp->cur_msgout[3];
3269 esp->esp_command[4] = esp->cur_msgout[4];
3270 esp->dma_setup(esp, esp->esp_command_dvma, 5, 0);
3271 esp_setcount(eregs, 5);
3272 esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI);
3278 ESPMISC(("bogus msgout sending NOP\n"));
3279 esp->cur_msgout[0] = NOP;
3280 esp_write(eregs->esp_fdata, esp->cur_msgout[0]);
3281 esp->msgout_len = 1;
3282 esp_cmd(esp, eregs, ESP_CMD_TI);
3285 esp_advance_phase(esp->current_SC, in_msgoutdone);
3289 static int esp_do_msgoutdone(struct NCR_ESP *esp,
3290 struct ESP_regs *eregs)
3292 if((esp->msgout_len > 1) && esp->dma_barrier)
3293 esp->dma_barrier(esp);
3295 if(!(esp->ireg & ESP_INTR_DC)) {
3296 esp_cmd(esp, eregs, ESP_CMD_NULL);
3297 switch(esp->sreg & ESP_STAT_PMASK) {
3299 /* whoops, parity error */
3300 ESPLOG(("esp%d: still in msgout, parity error assumed\n",
3302 if(esp->msgout_len > 1)
3303 esp_cmd(esp, eregs, ESP_CMD_SATN);
3304 esp_advance_phase(esp->current_SC, in_msgout);
3311 if(!fcount(esp, eregs) &&
3312 !(((struct esp_device *)esp->current_SC->device->hostdata)->sync_max_offset))
3313 esp_cmd(esp, eregs, ESP_CMD_FLUSH);
3319 /* If we sent out a synchronous negotiation message, update
3322 if(esp->cur_msgout[2] == EXTENDED_MESSAGE &&
3323 esp->cur_msgout[4] == EXTENDED_SDTR) {
3324 esp->snip = 1; /* anal retentiveness... */
3327 esp->prevmsgout = esp->cur_msgout[0];
3328 esp->msgout_len = 0;
3329 esp_advance_phase(esp->current_SC, in_the_dark);
3330 return esp_do_phase_determine(esp, eregs);
3333 static int esp_bus_unexpected(struct NCR_ESP *esp, struct ESP_regs *eregs)
3335 ESPLOG(("esp%d: command in weird state %2x\n",
3336 esp->esp_id, esp->current_SC->SCp.phase));
3337 return do_reset_bus;
3340 static espfunc_t bus_vector[] = {
3353 esp_do_phase_determine,
3359 /* This is the second tier in our dual-level SCSI state machine. */
3360 static int esp_work_bus(struct NCR_ESP *esp, struct ESP_regs *eregs)
3362 Scsi_Cmnd *SCptr = esp->current_SC;
3365 ESPBUS(("esp_work_bus: "));
3367 ESPBUS(("reconnect\n"));
3368 return esp_do_reconnect(esp, eregs);
3370 phase = SCptr->SCp.phase;
3371 if ((phase & 0xf0) == in_phases_mask)
3372 return bus_vector[(phase & 0x0f)](esp, eregs);
3373 else if((phase & 0xf0) == in_slct_mask)
3374 return esp_select_complete(esp, eregs);
3376 return esp_bus_unexpected(esp, eregs);
3379 static espfunc_t isvc_vector[] = {
3381 esp_do_phase_determine,
3387 /* Main interrupt handler for an esp adapter. */
3388 void esp_handle(struct NCR_ESP *esp)
3390 struct ESP_regs *eregs;
3392 int what_next = do_intr_end;
3394 SCptr = esp->current_SC;
3396 if(esp->dma_irq_entry)
3397 esp->dma_irq_entry(esp);
3399 /* Check for errors. */
3400 esp->sreg = esp_read(eregs->esp_status);
3401 esp->sreg &= (~ESP_STAT_INTR);
3402 esp->seqreg = (esp_read(eregs->esp_sstep) & ESP_STEP_VBITS);
3403 esp->ireg = esp_read(eregs->esp_intrpt); /* Unlatch intr and stat regs */
3404 ESPIRQ(("handle_irq: [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
3405 esp->sreg, esp->seqreg, esp->ireg));
3406 if(esp->sreg & (ESP_STAT_SPAM)) {
3407 /* Gross error, could be due to one of:
3409 * - top of fifo overwritten, could be because
3410 * we tried to do a synchronous transfer with
3411 * an offset greater than ESP fifo size
3413 * - top of command register overwritten
3415 * - DMA setup to go in one direction, SCSI
3416 * bus points in the other, whoops
3418 * - weird phase change during asynchronous
3419 * data phase while we are initiator
3421 ESPLOG(("esp%d: Gross error sreg=%2x\n", esp->esp_id, esp->sreg));
3423 /* If a command is live on the bus we cannot safely
3424 * reset the bus, so we'll just let the pieces fall
3425 * where they may. Here we are hoping that the
3426 * target will be able to cleanly go away soon
3427 * so we can safely reset things.
3430 ESPLOG(("esp%d: No current cmd during gross error, "
3431 "resetting bus\n", esp->esp_id));
3432 what_next = do_reset_bus;
3437 /* No current cmd is only valid at this point when there are
3438 * commands off the bus or we are trying a reset.
3440 if(!SCptr && !esp->disconnected_SC && !(esp->ireg & ESP_INTR_SR)) {
3441 /* Panic is safe, since current_SC is null. */
3442 ESPLOG(("esp%d: no command in esp_handle()\n", esp->esp_id));
3443 panic("esp_handle: current_SC == penguin within interrupt!");
3446 if(esp->ireg & (ESP_INTR_IC)) {
3447 /* Illegal command fed to ESP. Outside of obvious
3448 * software bugs that could cause this, there is
3449 * a condition with ESP100 where we can confuse the
3450 * ESP into an erroneous illegal command interrupt
3451 * because it does not scrape the FIFO properly
3452 * for reselection. See esp100_reconnect_hwbug()
3453 * to see how we try very hard to avoid this.
3455 ESPLOG(("esp%d: invalid command\n", esp->esp_id));
3457 esp_dump_state(esp, eregs);
3460 /* Devices with very buggy firmware can drop BSY
3461 * during a scatter list interrupt when using sync
3462 * mode transfers. We continue the transfer as
3463 * expected, the target drops the bus, the ESP
3464 * gets confused, and we get a illegal command
3465 * interrupt because the bus is in the disconnected
3466 * state now and ESP_CMD_TI is only allowed when
3467 * a nexus is alive on the bus.
3469 ESPLOG(("esp%d: Forcing async and disabling disconnect for "
3470 "target %d\n", esp->esp_id, SCptr->device->id));
3471 SCptr->device->borken = 1; /* foo on you */
3474 what_next = do_reset_bus;
3475 } else if(!(esp->ireg & ~(ESP_INTR_FDONE | ESP_INTR_BSERV | ESP_INTR_DC))) {
3479 phase = SCptr->SCp.phase;
3480 if(phase & in_phases_mask) {
3481 what_next = esp_work_bus(esp, eregs);
3482 } else if(phase & in_slct_mask) {
3483 what_next = esp_select_complete(esp, eregs);
3485 ESPLOG(("esp%d: interrupt for no good reason...\n",
3487 what_next = do_intr_end;
3490 ESPLOG(("esp%d: BSERV or FDONE or DC while SCptr==NULL\n",
3492 what_next = do_reset_bus;
3494 } else if(esp->ireg & ESP_INTR_SR) {
3495 ESPLOG(("esp%d: SCSI bus reset interrupt\n", esp->esp_id));
3496 what_next = do_reset_complete;
3497 } else if(esp->ireg & (ESP_INTR_S | ESP_INTR_SATN)) {
3498 ESPLOG(("esp%d: AIEEE we have been selected by another initiator!\n",
3500 what_next = do_reset_bus;
3501 } else if(esp->ireg & ESP_INTR_RSEL) {
3504 what_next = esp_do_reconnect(esp, eregs);
3505 } else if(SCptr->SCp.phase & in_slct_mask) {
3506 /* Only selection code knows how to clean
3509 ESPDISC(("Reselected during selection attempt\n"));
3510 what_next = esp_select_complete(esp, eregs);
3512 ESPLOG(("esp%d: Reselected while bus is busy\n",
3514 what_next = do_reset_bus;
3518 /* This is tier-one in our dual level SCSI state machine. */
3520 while(what_next != do_intr_end) {
3521 if (what_next >= do_phase_determine &&
3522 what_next < do_intr_end)
3523 what_next = isvc_vector[what_next](esp, eregs);
3525 /* state is completely lost ;-( */
3526 ESPLOG(("esp%d: interrupt engine loses state, resetting bus\n",
3528 what_next = do_reset_bus;
3531 if(esp->dma_irq_exit)
3532 esp->dma_irq_exit(esp);
3536 irqreturn_t esp_intr(int irq, void *dev_id, struct pt_regs *pregs)
3538 struct NCR_ESP *esp;
3539 unsigned long flags;
3541 struct Scsi_Host *dev = dev_id;
3543 /* Handle all ESP interrupts showing at this IRQ level. */
3544 spin_lock_irqsave(dev->host_lock, flags);
3549 if(((esp)->irq & 0xff) == irq) {
3551 if(esp->dma_irq_p(esp)) {
3554 esp->dma_ints_off(esp);
3556 ESPIRQ(("I%d(", esp->esp_id));
3560 esp->dma_ints_on(esp);
3568 spin_unlock_irqrestore(dev->host_lock, flags);
3572 /* For SMP we only service one ESP on the list list at our IRQ level! */
3573 irqreturn_t esp_intr(int irq, void *dev_id, struct pt_regs *pregs)
3575 struct NCR_ESP *esp;
3576 unsigned long flags;
3577 struct Scsi_Host *dev = dev_id;
3579 /* Handle all ESP interrupts showing at this IRQ level. */
3580 spin_lock_irqsave(dev->host_lock, flags);
3582 if(((esp)->irq & 0xf) == irq) {
3583 if(esp->dma_irq_p(esp)) {
3584 esp->dma_ints_off(esp);
3586 ESPIRQ(("I[%d:%d](",
3587 smp_processor_id(), esp->esp_id));
3591 esp->dma_ints_on(esp);
3597 spin_unlock_irqrestore(dev->host_lock, flags);
3602 int esp_slave_alloc(struct scsi_device *SDptr)
3604 struct esp_device *esp_dev =
3605 kmalloc(sizeof(struct esp_device), GFP_ATOMIC);
3609 memset(esp_dev, 0, sizeof(struct esp_device));
3610 SDptr->hostdata = esp_dev;
3614 void esp_slave_destroy(struct scsi_device *SDptr)
3616 struct NCR_ESP *esp = (struct NCR_ESP *) SDptr->host->hostdata;
3618 esp->targets_present &= ~(1 << sdev_id(SDptr));
3619 kfree(SDptr->hostdata);
3620 SDptr->hostdata = NULL;
3624 int init_module(void) { return 0; }
3625 void cleanup_module(void) {}
3626 void esp_release(void)
3629 esps_running = esps_in_use;
3633 EXPORT_SYMBOL(esp_abort);
3634 EXPORT_SYMBOL(esp_allocate);
3635 EXPORT_SYMBOL(esp_deallocate);
3636 EXPORT_SYMBOL(esp_initialize);
3637 EXPORT_SYMBOL(esp_intr);
3638 EXPORT_SYMBOL(esp_queue);
3639 EXPORT_SYMBOL(esp_reset);
3640 EXPORT_SYMBOL(esp_slave_alloc);
3641 EXPORT_SYMBOL(esp_slave_destroy);
3642 EXPORT_SYMBOL(esps_in_use);
3644 MODULE_LICENSE("GPL");
projects / linux-2.6 / blob