1 /* $Id: esp.c,v 1.98 2000/11/02 22:34:16 davem Exp $
2 * esp.c: EnhancedScsiProcessor Sun SCSI driver code.
4 * Copyright (C) 1995, 1998 David S. Miller (davem@caip.rutgers.edu)
9 * 1) Maybe disable parity checking in config register one for SCSI1
10 * targets. (Gilmore says parity error on the SBus can lock up
12 * 2) Add support for DMA2 pipelining.
13 * 3) Add tagged queueing.
16 #include <linux/config.h>
17 #include <linux/kernel.h>
18 #include <linux/delay.h>
19 #include <linux/types.h>
20 #include <linux/string.h>
21 #include <linux/malloc.h>
22 #include <linux/blk.h>
23 #include <linux/proc_fs.h>
24 #include <linux/stat.h>
25 #include <linux/init.h>
26 #include <linux/spinlock.h>
34 #include <asm/system.h>
35 #include <asm/ptrace.h>
36 #include <asm/pgtable.h>
37 #include <asm/oplib.h>
42 #include <asm/machines.h>
43 #include <asm/idprom.h>
46 #include <linux/module.h>
49 /* #define DEBUG_ESP_HME */
50 /* #define DEBUG_ESP_DATA */
51 /* #define DEBUG_ESP_QUEUE */
52 /* #define DEBUG_ESP_DISCONNECT */
53 /* #define DEBUG_ESP_STATUS */
54 /* #define DEBUG_ESP_PHASES */
55 /* #define DEBUG_ESP_WORKBUS */
56 /* #define DEBUG_STATE_MACHINE */
57 /* #define DEBUG_ESP_CMDS */
58 /* #define DEBUG_ESP_IRQS */
59 /* #define DEBUG_SDTR */
60 /* #define DEBUG_ESP_SG */
62 /* Use the following to sprinkle debugging messages in a way which
63 * suits you if combinations of the above become too verbose when
64 * trying to track down a specific problem.
66 /* #define DEBUG_ESP_MISC */
68 #if defined(DEBUG_ESP)
69 #define ESPLOG(foo) printk foo
72 #endif /* (DEBUG_ESP) */
74 #if defined(DEBUG_ESP_HME)
75 #define ESPHME(foo) printk foo
80 #if defined(DEBUG_ESP_DATA)
81 #define ESPDATA(foo) printk foo
86 #if defined(DEBUG_ESP_QUEUE)
87 #define ESPQUEUE(foo) printk foo
92 #if defined(DEBUG_ESP_DISCONNECT)
93 #define ESPDISC(foo) printk foo
98 #if defined(DEBUG_ESP_STATUS)
99 #define ESPSTAT(foo) printk foo
104 #if defined(DEBUG_ESP_PHASES)
105 #define ESPPHASE(foo) printk foo
107 #define ESPPHASE(foo)
110 #if defined(DEBUG_ESP_WORKBUS)
111 #define ESPBUS(foo) printk foo
116 #if defined(DEBUG_ESP_IRQS)
117 #define ESPIRQ(foo) printk foo
122 #if defined(DEBUG_SDTR)
123 #define ESPSDTR(foo) printk foo
128 #if defined(DEBUG_ESP_MISC)
129 #define ESPMISC(foo) printk foo
134 /* Command phase enumeration. */
136 not_issued
= 0x00, /* Still in the issue_SC queue. */
138 /* Various forms of selecting a target. */
139 #define in_slct_mask 0x10
140 in_slct_norm
= 0x10, /* ESP is arbitrating, normal selection */
141 in_slct_stop
= 0x11, /* ESP will select, then stop with IRQ */
142 in_slct_msg
= 0x12, /* select, then send a message */
143 in_slct_tag
= 0x13, /* select and send tagged queue msg */
144 in_slct_sneg
= 0x14, /* select and acquire sync capabilities */
146 /* Any post selection activity. */
147 #define in_phases_mask 0x20
148 in_datain
= 0x20, /* Data is transferring from the bus */
149 in_dataout
= 0x21, /* Data is transferring to the bus */
150 in_data_done
= 0x22, /* Last DMA data operation done (maybe) */
151 in_msgin
= 0x23, /* Eating message from target */
152 in_msgincont
= 0x24, /* Eating more msg bytes from target */
153 in_msgindone
= 0x25, /* Decide what to do with what we got */
154 in_msgout
= 0x26, /* Sending message to target */
155 in_msgoutdone
= 0x27, /* Done sending msg out */
156 in_cmdbegin
= 0x28, /* Sending cmd after abnormal selection */
157 in_cmdend
= 0x29, /* Done sending slow cmd */
158 in_status
= 0x2a, /* Was in status phase, finishing cmd */
159 in_freeing
= 0x2b, /* freeing the bus for cmd cmplt or disc */
160 in_the_dark
= 0x2c, /* Don't know what bus phase we are in */
162 /* Special states, ie. not normal bus transitions... */
163 #define in_spec_mask 0x80
164 in_abortone
= 0x80, /* Aborting one command currently */
165 in_abortall
= 0x81, /* Blowing away all commands we have */
166 in_resetdev
= 0x82, /* SCSI target reset in progress */
167 in_resetbus
= 0x83, /* SCSI bus reset in progress */
168 in_tgterror
= 0x84, /* Target did something stupid */
172 /* Zero has special meaning, see skipahead[12]. */
175 /*1*/ do_phase_determine
,
177 /*3*/ do_reset_complete
,
182 /* The master ring of all esp hosts we are managing in this driver. */
183 static struct esp
*espchain
;
184 static spinlock_t espchain_lock
= SPIN_LOCK_UNLOCKED
;
185 static int esps_running
= 0;
187 /* Forward declarations. */
188 static void esp_intr(int irq
, void *dev_id
, struct pt_regs
*pregs
);
190 /* Debugging routines */
191 struct esp_cmdstrings
{
194 } esp_cmd_strings
[] = {
196 { ESP_CMD_NULL
, "ESP_NOP", },
197 { ESP_CMD_FLUSH
, "FIFO_FLUSH", },
198 { ESP_CMD_RC
, "RSTESP", },
199 { ESP_CMD_RS
, "RSTSCSI", },
200 /* Disconnected State Group */
201 { ESP_CMD_RSEL
, "RESLCTSEQ", },
202 { ESP_CMD_SEL
, "SLCTNATN", },
203 { ESP_CMD_SELA
, "SLCTATN", },
204 { ESP_CMD_SELAS
, "SLCTATNSTOP", },
205 { ESP_CMD_ESEL
, "ENSLCTRESEL", },
206 { ESP_CMD_DSEL
, "DISSELRESEL", },
207 { ESP_CMD_SA3
, "SLCTATN3", },
208 { ESP_CMD_RSEL3
, "RESLCTSEQ", },
209 /* Target State Group */
210 { ESP_CMD_SMSG
, "SNDMSG", },
211 { ESP_CMD_SSTAT
, "SNDSTATUS", },
212 { ESP_CMD_SDATA
, "SNDDATA", },
213 { ESP_CMD_DSEQ
, "DISCSEQ", },
214 { ESP_CMD_TSEQ
, "TERMSEQ", },
215 { ESP_CMD_TCCSEQ
, "TRGTCMDCOMPSEQ", },
216 { ESP_CMD_DCNCT
, "DISC", },
217 { ESP_CMD_RMSG
, "RCVMSG", },
218 { ESP_CMD_RCMD
, "RCVCMD", },
219 { ESP_CMD_RDATA
, "RCVDATA", },
220 { ESP_CMD_RCSEQ
, "RCVCMDSEQ", },
221 /* Initiator State Group */
222 { ESP_CMD_TI
, "TRANSINFO", },
223 { ESP_CMD_ICCSEQ
, "INICMDSEQCOMP", },
224 { ESP_CMD_MOK
, "MSGACCEPTED", },
225 { ESP_CMD_TPAD
, "TPAD", },
226 { ESP_CMD_SATN
, "SATN", },
227 { ESP_CMD_RATN
, "RATN", },
229 #define NUM_ESP_COMMANDS ((sizeof(esp_cmd_strings)) / (sizeof(struct esp_cmdstrings)))
231 /* Print textual representation of an ESP command */
232 static inline void esp_print_cmd(u8 espcmd
)
234 u8 dma_bit
= espcmd
& ESP_CMD_DMA
;
238 for (i
= 0; i
< NUM_ESP_COMMANDS
; i
++)
239 if (esp_cmd_strings
[i
].cmdchar
== espcmd
)
241 if (i
== NUM_ESP_COMMANDS
)
242 printk("ESP_Unknown");
244 printk("%s%s", esp_cmd_strings
[i
].text
,
245 ((dma_bit
) ? "+DMA" : ""));
248 /* Print the status register's value */
249 static inline void esp_print_statreg(u8 statreg
)
254 phase
= statreg
& ESP_STAT_PMASK
;
255 printk("%s,", (phase
== ESP_DOP
? "DATA-OUT" :
256 (phase
== ESP_DIP
? "DATA-IN" :
257 (phase
== ESP_CMDP
? "COMMAND" :
258 (phase
== ESP_STATP
? "STATUS" :
259 (phase
== ESP_MOP
? "MSG-OUT" :
260 (phase
== ESP_MIP
? "MSG_IN" :
262 if (statreg
& ESP_STAT_TDONE
)
263 printk("TRANS_DONE,");
264 if (statreg
& ESP_STAT_TCNT
)
265 printk("TCOUNT_ZERO,");
266 if (statreg
& ESP_STAT_PERR
)
268 if (statreg
& ESP_STAT_SPAM
)
270 if (statreg
& ESP_STAT_INTR
)
275 /* Print the interrupt register's value */
276 static inline void esp_print_ireg(u8 intreg
)
279 if (intreg
& ESP_INTR_S
)
280 printk("SLCT_NATN ");
281 if (intreg
& ESP_INTR_SATN
)
283 if (intreg
& ESP_INTR_RSEL
)
285 if (intreg
& ESP_INTR_FDONE
)
287 if (intreg
& ESP_INTR_BSERV
)
289 if (intreg
& ESP_INTR_DC
)
291 if (intreg
& ESP_INTR_IC
)
293 if (intreg
& ESP_INTR_SR
)
294 printk("SCSI_BUS_RESET ");
298 /* Print the sequence step registers contents */
299 static inline void esp_print_seqreg(u8 stepreg
)
301 stepreg
&= ESP_STEP_VBITS
;
303 (stepreg
== ESP_STEP_ASEL
? "SLCT_ARB_CMPLT" :
304 (stepreg
== ESP_STEP_SID
? "1BYTE_MSG_SENT" :
305 (stepreg
== ESP_STEP_NCMD
? "NOT_IN_CMD_PHASE" :
306 (stepreg
== ESP_STEP_PPC
? "CMD_BYTES_LOST" :
307 (stepreg
== ESP_STEP_FINI4
? "CMD_SENT_OK" :
311 static char *phase_string(int phase
)
367 #ifdef DEBUG_STATE_MACHINE
368 static inline void esp_advance_phase(Scsi_Cmnd
*s
, int newphase
)
370 ESPLOG(("<%s>", phase_string(newphase
)));
371 s
->SCp
.sent_command
= s
->SCp
.phase
;
372 s
->SCp
.phase
= newphase
;
375 #define esp_advance_phase(__s, __newphase) \
376 (__s)->SCp.sent_command = (__s)->SCp.phase; \
377 (__s)->SCp.phase = (__newphase);
380 #ifdef DEBUG_ESP_CMDS
381 extern inline void esp_cmd(struct esp
*esp
, u8 cmd
)
383 esp
->espcmdlog
[esp
->espcmdent
] = cmd
;
384 esp
->espcmdent
= (esp
->espcmdent
+ 1) & 31;
385 sbus_writeb(cmd
, esp
->eregs
+ ESP_CMD
);
388 #define esp_cmd(__esp, __cmd) \
389 sbus_writeb((__cmd), ((__esp)->eregs) + ESP_CMD)
392 #define ESP_INTSOFF(__dregs) \
393 sbus_writel(sbus_readl((__dregs)+DMA_CSR)&~(DMA_INT_ENAB), (__dregs)+DMA_CSR)
394 #define ESP_INTSON(__dregs) \
395 sbus_writel(sbus_readl((__dregs)+DMA_CSR)|DMA_INT_ENAB, (__dregs)+DMA_CSR)
396 #define ESP_IRQ_P(__dregs) \
397 (sbus_readl((__dregs)+DMA_CSR) & (DMA_HNDL_INTR|DMA_HNDL_ERROR))
399 /* How we use the various Linux SCSI data structures for operation.
403 * We keep track of the synchronous capabilities of a target
404 * in the device member, using sync_min_period and
405 * sync_max_offset. These are the values we directly write
406 * into the ESP registers while running a command. If offset
407 * is zero the ESP will use asynchronous transfers.
408 * If the borken flag is set we assume we shouldn't even bother
409 * trying to negotiate for synchronous transfer as this target
410 * is really stupid. If we notice the target is dropping the
411 * bus, and we have been allowing it to disconnect, we clear
412 * the disconnect flag.
416 /* Manipulation of the ESP command queues. Thanks to the aha152x driver
417 * and its author, Juergen E. Fischer, for the methods used here.
418 * Note that these are per-ESP queues, not global queues like
419 * the aha152x driver uses.
421 static inline void append_SC(Scsi_Cmnd
**SC
, Scsi_Cmnd
*new_SC
)
425 new_SC
->host_scribble
= (unsigned char *) NULL
;
429 for (end
=*SC
;end
->host_scribble
;end
=(Scsi_Cmnd
*)end
->host_scribble
)
431 end
->host_scribble
= (unsigned char *) new_SC
;
435 static inline void prepend_SC(Scsi_Cmnd
**SC
, Scsi_Cmnd
*new_SC
)
437 new_SC
->host_scribble
= (unsigned char *) *SC
;
441 static inline Scsi_Cmnd
*remove_first_SC(Scsi_Cmnd
**SC
)
446 *SC
= (Scsi_Cmnd
*) (*SC
)->host_scribble
;
450 static inline Scsi_Cmnd
*remove_SC(Scsi_Cmnd
**SC
, int target
, int lun
)
452 Scsi_Cmnd
*ptr
, *prev
;
454 for (ptr
= *SC
, prev
= NULL
;
455 ptr
&& ((ptr
->target
!= target
) || (ptr
->lun
!= lun
));
456 prev
= ptr
, ptr
= (Scsi_Cmnd
*) ptr
->host_scribble
)
460 prev
->host_scribble
=ptr
->host_scribble
;
462 *SC
=(Scsi_Cmnd
*)ptr
->host_scribble
;
467 /* Resetting various pieces of the ESP scsi driver chipset/buses. */
468 static void esp_reset_dma(struct esp
*esp
)
471 int can_do_burst16
, can_do_burst32
, can_do_burst64
;
475 can_do_burst16
= (esp
->bursts
& DMA_BURST16
) != 0;
476 can_do_burst32
= (esp
->bursts
& DMA_BURST32
) != 0;
479 if (sbus_can_dma_64bit(esp
->sdev
))
481 if (sbus_can_burst64(esp
->sdev
))
482 can_do_burst64
= (esp
->bursts
& DMA_BURST64
) != 0;
484 /* Punt the DVMA into a known state. */
485 if (esp
->dma
->revision
!= dvmahme
) {
486 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
487 sbus_writel(tmp
| DMA_RST_SCSI
, esp
->dregs
+ DMA_CSR
);
488 sbus_writel(tmp
& ~DMA_RST_SCSI
, esp
->dregs
+ DMA_CSR
);
490 switch (esp
->dma
->revision
) {
492 /* This is the HME DVMA gate array. */
494 save_flags(flags
); cli(); /* I really hate this chip. */
496 sbus_writel(DMA_RESET_FAS366
, esp
->dregs
+ DMA_CSR
);
497 sbus_writel(DMA_RST_SCSI
, esp
->dregs
+ DMA_CSR
);
499 esp
->prev_hme_dmacsr
= (DMA_PARITY_OFF
|DMA_2CLKS
|DMA_SCSI_DISAB
|DMA_INT_ENAB
);
500 esp
->prev_hme_dmacsr
&= ~(DMA_ENABLE
|DMA_ST_WRITE
|DMA_BRST_SZ
);
503 esp
->prev_hme_dmacsr
|= DMA_BRST64
;
504 else if (can_do_burst32
)
505 esp
->prev_hme_dmacsr
|= DMA_BRST32
;
508 esp
->prev_hme_dmacsr
|= DMA_SCSI_SBUS64
;
509 sbus_set_sbus64(esp
->sdev
, esp
->bursts
);
512 /* This chip is horrible. */
513 while (sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_PEND_READ
)
516 sbus_writel(0, esp
->dregs
+ DMA_CSR
);
517 sbus_writel(esp
->prev_hme_dmacsr
, esp
->dregs
+ DMA_CSR
);
519 /* This is necessary to avoid having the SCSI channel
520 * engine lock up on us.
522 sbus_writel(0, esp
->dregs
+ DMA_ADDR
);
524 restore_flags(flags
);
527 /* This is the gate array found in the sun4m
528 * NCR SBUS I/O subsystem.
530 if (esp
->erev
!= esp100
) {
531 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
532 sbus_writel(tmp
| DMA_3CLKS
, esp
->dregs
+ DMA_CSR
);
536 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
539 if (can_do_burst32
) {
543 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
546 /* This is the DMA unit found on SCSI/Ether cards. */
547 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
548 tmp
|= DMA_ADD_ENABLE
;
549 tmp
&= ~DMA_BCNT_ENAB
;
550 if (!can_do_burst32
&& can_do_burst16
) {
551 tmp
|= DMA_ESC_BURST
;
553 tmp
&= ~(DMA_ESC_BURST
);
555 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
560 ESP_INTSON(esp
->dregs
);
563 /* Reset the ESP chip, _not_ the SCSI bus. */
564 static void __init
esp_reset_esp(struct esp
*esp
)
566 u8 family_code
, version
;
569 /* Now reset the ESP chip */
570 esp_cmd(esp
, ESP_CMD_RC
);
571 esp_cmd(esp
, ESP_CMD_NULL
| ESP_CMD_DMA
);
572 esp_cmd(esp
, ESP_CMD_NULL
| ESP_CMD_DMA
);
574 /* Reload the configuration registers */
575 sbus_writeb(esp
->cfact
, esp
->eregs
+ ESP_CFACT
);
577 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
579 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
580 sbus_writeb(esp
->neg_defp
, esp
->eregs
+ ESP_TIMEO
);
582 /* This is the only point at which it is reliable to read
583 * the ID-code for a fast ESP chip variants.
585 esp
->max_period
= ((35 * esp
->ccycle
) / 1000);
586 if (esp
->erev
== fast
) {
587 version
= sbus_readb(esp
->eregs
+ ESP_UID
);
588 family_code
= (version
& 0xf8) >> 3;
589 if (family_code
== 0x02)
591 else if (family_code
== 0x0a)
592 esp
->erev
= fashme
; /* Version is usually '5'. */
595 ESPMISC(("esp%d: FAST chip is %s (family=%d, version=%d)\n",
597 (esp
->erev
== fas236
) ? "fas236" :
598 ((esp
->erev
== fas100a
) ? "fas100a" :
599 "fasHME"), family_code
, (version
& 7)));
601 esp
->min_period
= ((4 * esp
->ccycle
) / 1000);
603 esp
->min_period
= ((5 * esp
->ccycle
) / 1000);
605 esp
->max_period
= (esp
->max_period
+ 3)>>2;
606 esp
->min_period
= (esp
->min_period
+ 3)>>2;
608 sbus_writeb(esp
->config1
, esp
->eregs
+ ESP_CFG1
);
614 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
618 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
619 esp
->prev_cfg3
= esp
->config3
[0];
620 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
623 esp
->config2
|= (ESP_CONFIG2_HME32
| ESP_CONFIG2_HMEFENAB
);
626 /* Fast 236 or HME */
627 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
628 for (i
= 0; i
< 16; i
++) {
629 if (esp
->erev
== fashme
) {
632 cfg3
= ESP_CONFIG3_FCLOCK
| ESP_CONFIG3_OBPUSH
;
633 if (esp
->scsi_id
>= 8)
634 cfg3
|= ESP_CONFIG3_IDBIT3
;
635 esp
->config3
[i
] |= cfg3
;
637 esp
->config3
[i
] |= ESP_CONFIG3_FCLK
;
640 esp
->prev_cfg3
= esp
->config3
[0];
641 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
642 if (esp
->erev
== fashme
) {
653 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
654 for (i
= 0; i
< 16; i
++)
655 esp
->config3
[i
] |= ESP_CONFIG3_FCLOCK
;
656 esp
->prev_cfg3
= esp
->config3
[0];
657 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
661 panic("esp: what could it be... I wonder...");
665 /* Eat any bitrot in the chip */
666 sbus_readb(esp
->eregs
+ ESP_INTRPT
);
670 /* This places the ESP into a known state at boot time. */
671 static void __init
esp_bootup_reset(struct esp
*esp
)
681 /* Reset the SCSI bus, but tell ESP not to generate an irq */
682 tmp
= sbus_readb(esp
->eregs
+ ESP_CFG1
);
683 tmp
|= ESP_CONFIG1_SRRDISAB
;
684 sbus_writeb(tmp
, esp
->eregs
+ ESP_CFG1
);
686 esp_cmd(esp
, ESP_CMD_RS
);
689 sbus_writeb(esp
->config1
, esp
->eregs
+ ESP_CFG1
);
691 /* Eat any bitrot in the chip and we are done... */
692 sbus_readb(esp
->eregs
+ ESP_INTRPT
);
695 static void esp_chain_add(struct esp
*esp
)
697 spin_lock_irq(&espchain_lock
);
699 struct esp
*elink
= espchain
;
707 spin_unlock_irq(&espchain_lock
);
710 static void esp_chain_del(struct esp
*esp
)
712 spin_lock_irq(&espchain_lock
);
713 if (espchain
== esp
) {
714 espchain
= esp
->next
;
716 struct esp
*elink
= espchain
;
717 while (elink
->next
!= esp
)
719 elink
->next
= esp
->next
;
722 spin_unlock_irq(&espchain_lock
);
725 static int __init
esp_find_dvma(struct esp
*esp
, struct sbus_dev
*dma_sdev
)
727 struct sbus_dev
*sdev
= esp
->sdev
;
728 struct sbus_dma
*dma
;
730 if (dma_sdev
!= NULL
) {
732 if (dma
->sdev
== dma_sdev
)
737 /* If allocated already, can't use it. */
741 if (dma
->sdev
== NULL
)
744 /* If bus + slot are the same and it has the
745 * correct OBP name, it's ours.
747 if (sdev
->bus
== dma
->sdev
->bus
&&
748 sdev
->slot
== dma
->sdev
->slot
&&
749 (!strcmp(dma
->sdev
->prom_name
, "dma") ||
750 !strcmp(dma
->sdev
->prom_name
, "espdma")))
755 /* If we don't know how to handle the dvma,
756 * do not use this device.
759 printk("Cannot find dvma for ESP%d's SCSI\n", esp
->esp_id
);
762 if (dma
->allocated
) {
763 printk("esp%d: can't use my espdma\n", esp
->esp_id
);
768 esp
->dregs
= dma
->regs
;
773 static int __init
esp_map_regs(struct esp
*esp
, int hme
)
775 struct sbus_dev
*sdev
= esp
->sdev
;
776 struct resource
*res
;
778 /* On HME, two reg sets exist, first is DVMA,
779 * second is ESP registers.
782 res
= &sdev
->resource
[1];
784 res
= &sdev
->resource
[0];
786 esp
->eregs
= sbus_ioremap(res
, 0, ESP_REG_SIZE
, "ESP Registers");
793 static int __init
esp_map_cmdarea(struct esp
*esp
)
795 struct sbus_dev
*sdev
= esp
->sdev
;
797 esp
->esp_command
= sbus_alloc_consistent(sdev
, 16,
798 &esp
->esp_command_dvma
);
799 if (esp
->esp_command
== NULL
||
800 esp
->esp_command_dvma
== 0)
805 static int __init
esp_register_irq(struct esp
*esp
)
807 esp
->ehost
->irq
= esp
->irq
= esp
->sdev
->irqs
[0];
809 /* We used to try various overly-clever things to
810 * reduce the interrupt processing overhead on
811 * sun4c/sun4m when multiple ESP's shared the
812 * same IRQ. It was too complex and messy to
815 if (request_irq(esp
->ehost
->irq
, esp_intr
,
816 SA_SHIRQ
, "ESP SCSI", esp
)) {
817 printk("esp%d: Cannot acquire irq line\n",
822 printk("esp%d: IRQ %s ", esp
->esp_id
,
823 __irq_itoa(esp
->ehost
->irq
));
828 static void __init
esp_get_scsi_id(struct esp
*esp
)
830 struct sbus_dev
*sdev
= esp
->sdev
;
832 esp
->scsi_id
= prom_getintdefault(esp
->prom_node
,
835 if (esp
->scsi_id
== -1)
836 esp
->scsi_id
= prom_getintdefault(esp
->prom_node
,
839 if (esp
->scsi_id
== -1)
840 esp
->scsi_id
= (sdev
->bus
== NULL
) ? 7 :
841 prom_getintdefault(sdev
->bus
->prom_node
,
844 esp
->ehost
->this_id
= esp
->scsi_id
;
845 esp
->scsi_id_mask
= (1 << esp
->scsi_id
);
849 static void __init
esp_get_clock_params(struct esp
*esp
)
851 struct sbus_dev
*sdev
= esp
->sdev
;
852 int prom_node
= esp
->prom_node
;
857 if (sdev
!= NULL
&& sdev
->bus
!= NULL
)
858 sbus_prom_node
= sdev
->bus
->prom_node
;
862 /* This is getting messy but it has to be done
863 * correctly or else you get weird behavior all
864 * over the place. We are trying to basically
865 * figure out three pieces of information.
867 * a) Clock Conversion Factor
869 * This is a representation of the input
870 * crystal clock frequency going into the
871 * ESP on this machine. Any operation whose
872 * timing is longer than 400ns depends on this
873 * value being correct. For example, you'll
874 * get blips for arbitration/selection during
875 * high load or with multiple targets if this
876 * is not set correctly.
878 * b) Selection Time-Out
880 * The ESP isn't very bright and will arbitrate
881 * for the bus and try to select a target
882 * forever if you let it. This value tells
883 * the ESP when it has taken too long to
884 * negotiate and that it should interrupt
885 * the CPU so we can see what happened.
886 * The value is computed as follows (from
887 * NCR/Symbios chip docs).
889 * (Time Out Period) * (Input Clock)
890 * STO = ----------------------------------
891 * (8192) * (Clock Conversion Factor)
893 * You usually want the time out period to be
894 * around 250ms, I think we'll set it a little
895 * bit higher to account for fully loaded SCSI
896 * bus's and slow devices that don't respond so
897 * quickly to selection attempts. (yeah, I know
898 * this is out of spec. but there is a lot of
899 * buggy pieces of firmware out there so bite me)
901 * c) Imperical constants for synchronous offset
902 * and transfer period register values
904 * This entails the smallest and largest sync
905 * period we could ever handle on this ESP.
908 fmhz
= prom_getintdefault(prom_node
, "clock-frequency", -1);
910 fmhz
= (!sbus_prom_node
) ? 0 :
911 prom_getintdefault(sbus_prom_node
, "clock-frequency", -1);
913 if (fmhz
<= (5000000))
916 ccf
= (((5000000 - 1) + (fmhz
))/(5000000));
918 if (!ccf
|| ccf
> 8) {
919 /* If we can't find anything reasonable,
920 * just assume 20MHZ. This is the clock
921 * frequency of the older sun4c's where I've
922 * been unable to find the clock-frequency
923 * PROM property. All other machines provide
924 * useful values it seems.
930 if (ccf
== (ESP_CCF_F7
+ 1))
931 esp
->cfact
= ESP_CCF_F0
;
932 else if (ccf
== ESP_CCF_NEVER
)
933 esp
->cfact
= ESP_CCF_F2
;
936 esp
->raw_cfact
= ccf
;
939 esp
->ccycle
= ESP_MHZ_TO_CYCLE(fmhz
);
940 esp
->ctick
= ESP_TICK(ccf
, esp
->ccycle
);
941 esp
->neg_defp
= ESP_NEG_DEFP(fmhz
, ccf
);
942 esp
->sync_defp
= SYNC_DEFP_SLOW
;
944 printk("SCSI ID %d Clk %dMHz CCYC=%d CCF=%d TOut %d ",
945 esp
->scsi_id
, (fmhz
/ 1000000),
946 (int)esp
->ccycle
, (int)ccf
, (int) esp
->neg_defp
);
949 static void __init
esp_get_bursts(struct esp
*esp
, struct sbus_dev
*dma
)
951 struct sbus_dev
*sdev
= esp
->sdev
;
954 bursts
= prom_getintdefault(esp
->prom_node
, "burst-sizes", 0xff);
957 u8 tmp
= prom_getintdefault(dma
->prom_node
,
958 "burst-sizes", 0xff);
964 u8 tmp
= prom_getintdefault(sdev
->bus
->prom_node
,
965 "burst-sizes", 0xff);
970 if (bursts
== 0xff ||
971 (bursts
& DMA_BURST16
) == 0 ||
972 (bursts
& DMA_BURST32
) == 0)
973 bursts
= (DMA_BURST32
- 1);
975 esp
->bursts
= bursts
;
978 static void __init
esp_get_revision(struct esp
*esp
)
982 esp
->config1
= (ESP_CONFIG1_PENABLE
| (esp
->scsi_id
& 7));
983 esp
->config2
= (ESP_CONFIG2_SCSI2ENAB
| ESP_CONFIG2_REGPARITY
);
984 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
986 tmp
= sbus_readb(esp
->eregs
+ ESP_CFG2
);
987 tmp
&= ~ESP_CONFIG2_MAGIC
;
988 if (tmp
!= (ESP_CONFIG2_SCSI2ENAB
| ESP_CONFIG2_REGPARITY
)) {
989 /* If what we write to cfg2 does not come back, cfg2
990 * is not implemented, therefore this must be a plain
994 printk("NCR53C90(esp100)\n");
997 esp
->prev_cfg3
= esp
->config3
[0] = 5;
998 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
999 sbus_writeb(0, esp
->eregs
+ ESP_CFG3
);
1000 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
1002 tmp
= sbus_readb(esp
->eregs
+ ESP_CFG3
);
1004 /* The cfg2 register is implemented, however
1005 * cfg3 is not, must be esp100a.
1007 esp
->erev
= esp100a
;
1008 printk("NCR53C90A(esp100a)\n");
1012 for (target
= 0; target
< 16; target
++)
1013 esp
->config3
[target
] = 0;
1015 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
1017 /* All of cfg{1,2,3} implemented, must be one of
1018 * the fas variants, figure out which one.
1020 if (esp
->raw_cfact
> ESP_CCF_F5
) {
1022 esp
->sync_defp
= SYNC_DEFP_FAST
;
1023 printk("NCR53C9XF(espfast)\n");
1026 printk("NCR53C9x(esp236)\n");
1029 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
1034 static void __init
esp_init_swstate(struct esp
*esp
)
1038 /* Driver spinlock... */
1039 spin_lock_init(&esp
->lock
);
1041 /* Command queues... */
1042 esp
->current_SC
= NULL
;
1043 esp
->disconnected_SC
= NULL
;
1044 esp
->issue_SC
= NULL
;
1046 /* Target and current command state... */
1047 esp
->targets_present
= 0;
1048 esp
->resetting_bus
= 0;
1052 for(i
= 0; i
< 32; i
++)
1053 esp
->espcmdlog
[i
] = 0;
1056 /* MSG phase state... */
1057 for(i
= 0; i
< 16; i
++) {
1058 esp
->cur_msgout
[i
] = 0;
1059 esp
->cur_msgin
[i
] = 0;
1061 esp
->prevmsgout
= esp
->prevmsgin
= 0;
1062 esp
->msgout_len
= esp
->msgin_len
= 0;
1064 /* Clear the one behind caches to hold unmatchable values. */
1065 esp
->prev_soff
= esp
->prev_stp
= esp
->prev_cfg3
= 0xff;
1066 esp
->prev_hme_dmacsr
= 0xffffffff;
1069 static int __init
detect_one_esp(Scsi_Host_Template
*tpnt
, struct sbus_dev
*esp_dev
,
1070 struct sbus_dev
*espdma
, struct sbus_bus
*sbus
,
1073 struct Scsi_Host
*esp_host
= scsi_register(tpnt
, sizeof(struct esp
));
1077 printk("ESP: Cannot register SCSI host\n");
1081 esp_host
->max_id
= 16;
1082 esp
= (struct esp
*) esp_host
->hostdata
;
1083 esp
->ehost
= esp_host
;
1084 esp
->sdev
= esp_dev
;
1086 esp
->prom_node
= esp_dev
->prom_node
;
1087 prom_getstring(esp
->prom_node
, "name", esp
->prom_name
,
1088 sizeof(esp
->prom_name
));
1091 if (esp_find_dvma(esp
, espdma
) < 0)
1093 if (esp_map_regs(esp
, hme
) < 0) {
1094 printk("ESP registers unmappable");
1095 goto fail_dvma_release
;
1097 if (esp_map_cmdarea(esp
) < 0) {
1098 printk("ESP DVMA transport area unmappable");
1099 goto fail_unmap_regs
;
1101 if (esp_register_irq(esp
) < 0)
1102 goto fail_unmap_cmdarea
;
1104 esp_get_scsi_id(esp
);
1106 esp
->diff
= prom_getbool(esp
->prom_node
, "differential");
1108 printk("Differential ");
1110 esp_get_clock_params(esp
);
1111 esp_get_bursts(esp
, espdma
);
1112 esp_get_revision(esp
);
1113 esp_init_swstate(esp
);
1115 esp_bootup_reset(esp
);
1120 sbus_free_consistent(esp
->sdev
, 16,
1121 (void *) esp
->esp_command
,
1122 esp
->esp_command_dvma
);
1125 sbus_iounmap(esp
->eregs
, ESP_REG_SIZE
);
1128 esp
->dma
->allocated
= 0;
1132 scsi_unregister(esp_host
);
1136 /* Detecting ESP chips on the machine. This is the simple and easy
1142 #include <asm/sun4paddr.h>
1144 int __init
esp_detect(Scsi_Host_Template
*tpnt
)
1146 static struct sbus_dev esp_dev
;
1147 int esps_in_use
= 0;
1151 if (sun4_esp_physaddr
) {
1152 memset (&esp_dev
, 0, sizeof(esp_dev
));
1153 esp_dev
.reg_addrs
[0].phys_addr
= sun4_esp_physaddr
;
1154 esp_dev
.irqs
[0] = 4;
1155 esp_dev
.resource
[0].start
= sun4_esp_physaddr
;
1156 esp_dev
.resource
[0].end
= sun4_esp_physaddr
+ ESP_REG_SIZE
- 1;
1157 esp_dev
.resource
[0].flags
= IORESOURCE_IO
;
1159 if (!detect_one_esp(tpnt
, &esp_dev
, NULL
, NULL
, 0, 0))
1161 printk("ESP: Total of 1 ESP hosts found, %d actually in use.\n", esps_in_use
);
1162 esps_running
= esps_in_use
;
1167 #else /* !CONFIG_SUN4 */
1169 int __init
esp_detect(Scsi_Host_Template
*tpnt
)
1171 struct sbus_bus
*sbus
;
1172 struct sbus_dev
*esp_dev
, *sbdev_iter
;
1173 int nesps
= 0, esps_in_use
= 0;
1180 panic("No SBUS in esp_detect()");
1183 for_each_sbus(sbus
) {
1184 for_each_sbusdev(sbdev_iter
, sbus
) {
1185 struct sbus_dev
*espdma
= NULL
;
1188 /* Is it an esp sbus device? */
1189 esp_dev
= sbdev_iter
;
1190 if (strcmp(esp_dev
->prom_name
, "esp") &&
1191 strcmp(esp_dev
->prom_name
, "SUNW,esp")) {
1192 if (!strcmp(esp_dev
->prom_name
, "SUNW,fas")) {
1196 if (!esp_dev
->child
||
1197 (strcmp(esp_dev
->prom_name
, "espdma") &&
1198 strcmp(esp_dev
->prom_name
, "dma")))
1199 continue; /* nope... */
1201 esp_dev
= esp_dev
->child
;
1202 if (strcmp(esp_dev
->prom_name
, "esp") &&
1203 strcmp(esp_dev
->prom_name
, "SUNW,esp"))
1204 continue; /* how can this happen? */
1208 if (detect_one_esp(tpnt
, esp_dev
, espdma
, sbus
, nesps
++, hme
) < 0)
1212 } /* for each sbusdev */
1213 } /* for each sbus */
1214 printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps
,
1216 esps_running
= esps_in_use
;
1220 #endif /* !CONFIG_SUN4 */
1222 /* The info function will return whatever useful
1223 * information the developer sees fit. If not provided, then
1224 * the name field will be used instead.
1226 const char *esp_info(struct Scsi_Host
*host
)
1230 esp
= (struct esp
*) host
->hostdata
;
1231 switch (esp
->erev
) {
1233 return "Sparc ESP100 (NCR53C90)";
1235 return "Sparc ESP100A (NCR53C90A)";
1237 return "Sparc ESP236";
1239 return "Sparc ESP236-FAST";
1241 return "Sparc ESP366-HME";
1243 return "Sparc ESP100A-FAST";
1245 return "Bogon ESP revision";
1249 /* From Wolfgang Stanglmeier's NCR scsi driver. */
1258 static void copy_mem_info(struct info_str
*info
, char *data
, int len
)
1260 if (info
->pos
+ len
> info
->length
)
1261 len
= info
->length
- info
->pos
;
1263 if (info
->pos
+ len
< info
->offset
) {
1267 if (info
->pos
< info
->offset
) {
1268 data
+= (info
->offset
- info
->pos
);
1269 len
-= (info
->offset
- info
->pos
);
1273 memcpy(info
->buffer
+ info
->pos
, data
, len
);
1278 static int copy_info(struct info_str
*info
, char *fmt
, ...)
1284 va_start(args
, fmt
);
1285 len
= vsprintf(buf
, fmt
, args
);
1288 copy_mem_info(info
, buf
, len
);
1292 static int esp_host_info(struct esp
*esp
, char *ptr
, off_t offset
, int len
)
1294 struct info_str info
;
1299 info
.offset
= offset
;
1302 copy_info(&info
, "Sparc ESP Host Adapter:\n");
1303 copy_info(&info
, "\tPROM node\t\t%08x\n", (unsigned int) esp
->prom_node
);
1304 copy_info(&info
, "\tPROM name\t\t%s\n", esp
->prom_name
);
1305 copy_info(&info
, "\tESP Model\t\t");
1306 switch (esp
->erev
) {
1308 copy_info(&info
, "ESP100\n");
1311 copy_info(&info
, "ESP100A\n");
1314 copy_info(&info
, "ESP236\n");
1317 copy_info(&info
, "FAS236\n");
1320 copy_info(&info
, "FAS100A\n");
1323 copy_info(&info
, "FAST\n");
1326 copy_info(&info
, "Happy Meal FAS\n");
1330 copy_info(&info
, "Unknown!\n");
1333 copy_info(&info
, "\tDMA Revision\t\t");
1334 switch (esp
->dma
->revision
) {
1336 copy_info(&info
, "Rev 0\n");
1339 copy_info(&info
, "ESC Rev 1\n");
1342 copy_info(&info
, "Rev 1\n");
1345 copy_info(&info
, "Rev 2\n");
1348 copy_info(&info
, "Rev 3\n");
1351 copy_info(&info
, "Rev 1+\n");
1354 copy_info(&info
, "Rev HME/FAS\n");
1357 copy_info(&info
, "Unknown!\n");
1360 copy_info(&info
, "\tLive Targets\t\t[ ");
1361 for (i
= 0; i
< 15; i
++) {
1362 if (esp
->targets_present
& (1 << i
))
1363 copy_info(&info
, "%d ", i
);
1365 copy_info(&info
, "]\n\n");
1367 /* Now describe the state of each existing target. */
1368 copy_info(&info
, "Target #\tconfig3\t\tSync Capabilities\tDisconnect\tWide\n");
1369 for (i
= 0; i
< 15; i
++) {
1370 if (esp
->targets_present
& (1 << i
)) {
1371 Scsi_Device
*SDptr
= esp
->ehost
->host_queue
;
1373 while ((SDptr
->host
!= esp
->ehost
) &&
1376 SDptr
= SDptr
->next
;
1378 copy_info(&info
, "%d\t\t", i
);
1379 copy_info(&info
, "%08lx\t", esp
->config3
[i
]);
1380 copy_info(&info
, "[%02lx,%02lx]\t\t\t", SDptr
->sync_max_offset
,
1381 SDptr
->sync_min_period
);
1382 copy_info(&info
, "%s\t\t", SDptr
->disconnect
? "yes" : "no");
1383 copy_info(&info
, "%s\n",
1384 (esp
->config3
[i
] & ESP_CONFIG3_EWIDE
) ? "yes" : "no");
1387 return info
.pos
> info
.offset
? info
.pos
- info
.offset
: 0;
1390 /* ESP proc filesystem code. */
1391 int esp_proc_info(char *buffer
, char **start
, off_t offset
, int length
,
1392 int hostno
, int inout
)
1397 return -EINVAL
; /* not yet */
1400 if (esp
->ehost
->host_no
== hostno
)
1409 return esp_host_info(esp
, buffer
, offset
, length
);
1412 static void esp_get_dmabufs(struct esp
*esp
, Scsi_Cmnd
*sp
)
1414 if (sp
->use_sg
== 0) {
1415 sp
->SCp
.this_residual
= sp
->request_bufflen
;
1416 sp
->SCp
.buffer
= (struct scatterlist
*) sp
->request_buffer
;
1417 sp
->SCp
.buffers_residual
= 0;
1418 if (sp
->request_bufflen
) {
1419 sp
->SCp
.have_data_in
= sbus_map_single(esp
->sdev
, sp
->SCp
.buffer
,
1420 sp
->SCp
.this_residual
,
1421 scsi_to_sbus_dma_dir(sp
->sc_data_direction
));
1422 sp
->SCp
.ptr
= (char *) ((unsigned long)sp
->SCp
.have_data_in
);
1427 sp
->SCp
.buffer
= (struct scatterlist
*) sp
->buffer
;
1428 sp
->SCp
.buffers_residual
= sbus_map_sg(esp
->sdev
,
1431 scsi_to_sbus_dma_dir(sp
->sc_data_direction
));
1432 sp
->SCp
.this_residual
= sg_dma_len(sp
->SCp
.buffer
);
1433 sp
->SCp
.ptr
= (char *) ((unsigned long)sg_dma_address(sp
->SCp
.buffer
));
1437 static void esp_release_dmabufs(struct esp
*esp
, Scsi_Cmnd
*sp
)
1440 sbus_unmap_sg(esp
->sdev
, sp
->buffer
, sp
->use_sg
,
1441 scsi_to_sbus_dma_dir(sp
->sc_data_direction
));
1442 } else if (sp
->request_bufflen
) {
1443 sbus_unmap_single(esp
->sdev
,
1444 sp
->SCp
.have_data_in
,
1445 sp
->request_bufflen
,
1446 scsi_to_sbus_dma_dir(sp
->sc_data_direction
));
1450 static void esp_restore_pointers(struct esp
*esp
, Scsi_Cmnd
*sp
)
1452 struct esp_pointers
*ep
= &esp
->data_pointers
[sp
->target
];
1454 sp
->SCp
.ptr
= ep
->saved_ptr
;
1455 sp
->SCp
.buffer
= ep
->saved_buffer
;
1456 sp
->SCp
.this_residual
= ep
->saved_this_residual
;
1457 sp
->SCp
.buffers_residual
= ep
->saved_buffers_residual
;
1460 static void esp_save_pointers(struct esp
*esp
, Scsi_Cmnd
*sp
)
1462 struct esp_pointers
*ep
= &esp
->data_pointers
[sp
->target
];
1464 ep
->saved_ptr
= sp
->SCp
.ptr
;
1465 ep
->saved_buffer
= sp
->SCp
.buffer
;
1466 ep
->saved_this_residual
= sp
->SCp
.this_residual
;
1467 ep
->saved_buffers_residual
= sp
->SCp
.buffers_residual
;
1472 * 1) Never ever panic while something is live on the bus.
1473 * If there is to be any chance of syncing the disks this
1474 * rule is to be obeyed.
1476 * 2) Any target that causes a foul condition will no longer
1477 * have synchronous transfers done to it, no questions
1480 * 3) Keep register accesses to a minimum. Think about some
1481 * day when we have Xbus machines this is running on and
1482 * the ESP chip is on the other end of the machine on a
1483 * different board from the cpu where this is running.
1486 /* Fire off a command. We assume the bus is free and that the only
1487 * case where we could see an interrupt is where we have disconnected
1488 * commands active and they are trying to reselect us.
1490 static inline void esp_check_cmd(struct esp
*esp
, Scsi_Cmnd
*sp
)
1492 switch (sp
->cmd_len
) {
1496 esp
->esp_slowcmd
= 0;
1500 esp
->esp_slowcmd
= 1;
1501 esp
->esp_scmdleft
= sp
->cmd_len
;
1502 esp
->esp_scmdp
= &sp
->cmnd
[0];
1507 static inline void build_sync_nego_msg(struct esp
*esp
, int period
, int offset
)
1509 esp
->cur_msgout
[0] = EXTENDED_MESSAGE
;
1510 esp
->cur_msgout
[1] = 3;
1511 esp
->cur_msgout
[2] = EXTENDED_SDTR
;
1512 esp
->cur_msgout
[3] = period
;
1513 esp
->cur_msgout
[4] = offset
;
1514 esp
->msgout_len
= 5;
1517 /* SIZE is in bits, currently HME only supports 16 bit wide transfers. */
1518 static inline void build_wide_nego_msg(struct esp
*esp
, int size
)
1520 esp
->cur_msgout
[0] = EXTENDED_MESSAGE
;
1521 esp
->cur_msgout
[1] = 2;
1522 esp
->cur_msgout
[2] = EXTENDED_WDTR
;
1525 esp
->cur_msgout
[3] = 2;
1528 esp
->cur_msgout
[3] = 1;
1532 esp
->cur_msgout
[3] = 0;
1536 esp
->msgout_len
= 4;
1539 static void esp_exec_cmd(struct esp
*esp
)
1543 volatile u8
*cmdp
= esp
->esp_command
;
1548 /* Hold off if we have disconnected commands and
1549 * an IRQ is showing...
1551 if (esp
->disconnected_SC
&& ESP_IRQ_P(esp
->dregs
))
1554 /* Grab first member of the issue queue. */
1555 SCptr
= esp
->current_SC
= remove_first_SC(&esp
->issue_SC
);
1557 /* Safe to panic here because current_SC is null. */
1559 panic("esp: esp_exec_cmd and issue queue is NULL");
1561 SDptr
= SCptr
->device
;
1563 target
= SCptr
->target
;
1566 esp
->msgout_len
= 0;
1568 /* Send it out whole, or piece by piece? The ESP
1569 * only knows how to automatically send out 6, 10,
1570 * and 12 byte commands. I used to think that the
1571 * Linux SCSI code would never throw anything other
1572 * than that to us, but then again there is the
1573 * SCSI generic driver which can send us anything.
1575 esp_check_cmd(esp
, SCptr
);
1577 /* If arbitration/selection is successful, the ESP will leave
1578 * ATN asserted, causing the target to go into message out
1579 * phase. The ESP will feed the target the identify and then
1580 * the target can only legally go to one of command,
1581 * datain/out, status, or message in phase, or stay in message
1582 * out phase (should we be trying to send a sync negotiation
1583 * message after the identify). It is not allowed to drop
1584 * BSY, but some buggy targets do and we check for this
1585 * condition in the selection complete code. Most of the time
1586 * we'll make the command bytes available to the ESP and it
1587 * will not interrupt us until it finishes command phase, we
1588 * cannot do this for command sizes the ESP does not
1589 * understand and in this case we'll get interrupted right
1590 * when the target goes into command phase.
1592 * It is absolutely _illegal_ in the presence of SCSI-2 devices
1593 * to use the ESP select w/o ATN command. When SCSI-2 devices are
1594 * present on the bus we _must_ always go straight to message out
1595 * phase with an identify message for the target. Being that
1596 * selection attempts in SCSI-1 w/o ATN was an option, doing SCSI-2
1597 * selections should not confuse SCSI-1 we hope.
1601 /* this targets sync is known */
1602 #ifndef __sparc_v9__
1605 if (SDptr
->disconnect
)
1606 *cmdp
++ = IDENTIFY(1, lun
);
1608 *cmdp
++ = IDENTIFY(0, lun
);
1610 if (esp
->esp_slowcmd
) {
1611 the_esp_command
= (ESP_CMD_SELAS
| ESP_CMD_DMA
);
1612 esp_advance_phase(SCptr
, in_slct_stop
);
1614 the_esp_command
= (ESP_CMD_SELA
| ESP_CMD_DMA
);
1615 esp_advance_phase(SCptr
, in_slct_norm
);
1617 } else if (!(esp
->targets_present
& (1<<target
)) || !(SDptr
->disconnect
)) {
1618 /* After the bootup SCSI code sends both the
1619 * TEST_UNIT_READY and INQUIRY commands we want
1620 * to at least attempt allowing the device to
1623 ESPMISC(("esp: Selecting device for first time. target=%d "
1624 "lun=%d\n", target
, SCptr
->lun
));
1625 if (!SDptr
->borken
&& !SDptr
->disconnect
)
1626 SDptr
->disconnect
= 1;
1628 *cmdp
++ = IDENTIFY(0, lun
);
1629 esp
->prevmsgout
= NOP
;
1630 esp_advance_phase(SCptr
, in_slct_norm
);
1631 the_esp_command
= (ESP_CMD_SELA
| ESP_CMD_DMA
);
1633 /* Take no chances... */
1634 SDptr
->sync_max_offset
= 0;
1635 SDptr
->sync_min_period
= 0;
1637 /* Sorry, I have had way too many problems with
1638 * various CDROM devices on ESP. -DaveM
1640 int cdrom_hwbug_wkaround
= 0;
1642 #ifndef __sparc_v9__
1643 /* Never allow disconnects or synchronous transfers on
1644 * SparcStation1 and SparcStation1+. Allowing those
1645 * to be enabled seems to lockup the machine completely.
1647 if ((idprom
->id_machtype
== (SM_SUN4C
| SM_4C_SS1
)) ||
1648 (idprom
->id_machtype
== (SM_SUN4C
| SM_4C_SS1PLUS
))) {
1649 /* But we are nice and allow tapes and removable
1650 * disks (but not CDROMs) to disconnect.
1652 if(SDptr
->type
== TYPE_TAPE
||
1653 (SDptr
->type
!= TYPE_ROM
&& SDptr
->removable
))
1654 SDptr
->disconnect
= 1;
1656 SDptr
->disconnect
= 0;
1657 SDptr
->sync_max_offset
= 0;
1658 SDptr
->sync_min_period
= 0;
1663 #endif /* !(__sparc_v9__) */
1665 /* We've talked to this guy before,
1666 * but never negotiated. Let's try,
1667 * need to attempt WIDE first, before
1668 * sync nego, as per SCSI 2 standard.
1670 if (esp
->erev
== fashme
&& !SDptr
->wide
) {
1671 if (!SDptr
->borken
&&
1672 SDptr
->type
!= TYPE_ROM
&&
1673 SDptr
->removable
== 0) {
1674 build_wide_nego_msg(esp
, 16);
1677 goto after_nego_msg_built
;
1680 /* Fall through and try sync. */
1684 if (!SDptr
->borken
) {
1685 if ((SDptr
->type
== TYPE_ROM
)) {
1686 /* Nice try sucker... */
1687 ESPMISC(("esp%d: Disabling sync for buggy "
1688 "CDROM.\n", esp
->esp_id
));
1689 cdrom_hwbug_wkaround
= 1;
1690 build_sync_nego_msg(esp
, 0, 0);
1691 } else if (SDptr
->removable
!= 0) {
1692 ESPMISC(("esp%d: Not negotiating sync/wide but "
1693 "allowing disconnect for removable media.\n",
1695 build_sync_nego_msg(esp
, 0, 0);
1697 build_sync_nego_msg(esp
, esp
->sync_defp
, 15);
1700 build_sync_nego_msg(esp
, 0, 0);
1705 after_nego_msg_built
:
1706 /* A fix for broken SCSI1 targets, when they disconnect
1707 * they lock up the bus and confuse ESP. So disallow
1708 * disconnects for SCSI1 targets for now until we
1709 * find a better fix.
1711 * Addendum: This is funny, I figured out what was going
1712 * on. The blotzed SCSI1 target would disconnect,
1713 * one of the other SCSI2 targets or both would be
1714 * disconnected as well. The SCSI1 target would
1715 * stay disconnected long enough that we start
1716 * up a command on one of the SCSI2 targets. As
1717 * the ESP is arbitrating for the bus the SCSI1
1718 * target begins to arbitrate as well to reselect
1719 * the ESP. The SCSI1 target refuses to drop it's
1720 * ID bit on the data bus even though the ESP is
1721 * at ID 7 and is the obvious winner for any
1722 * arbitration. The ESP is a poor sport and refuses
1723 * to lose arbitration, it will continue indefinately
1724 * trying to arbitrate for the bus and can only be
1725 * stopped via a chip reset or SCSI bus reset.
1726 * Therefore _no_ disconnects for SCSI1 targets
1727 * thank you very much. ;-)
1729 if(((SDptr
->scsi_level
< 3) &&
1730 (SDptr
->type
!= TYPE_TAPE
) &&
1731 SDptr
->removable
== 0) ||
1732 cdrom_hwbug_wkaround
|| SDptr
->borken
) {
1733 ESPMISC((KERN_INFO
"esp%d: Disabling DISCONNECT for target %d "
1734 "lun %d\n", esp
->esp_id
, SCptr
->target
, SCptr
->lun
));
1735 SDptr
->disconnect
= 0;
1736 *cmdp
++ = IDENTIFY(0, lun
);
1738 *cmdp
++ = IDENTIFY(1, lun
);
1741 /* ESP fifo is only so big...
1742 * Make this look like a slow command.
1744 esp
->esp_slowcmd
= 1;
1745 esp
->esp_scmdleft
= SCptr
->cmd_len
;
1746 esp
->esp_scmdp
= &SCptr
->cmnd
[0];
1748 the_esp_command
= (ESP_CMD_SELAS
| ESP_CMD_DMA
);
1749 esp_advance_phase(SCptr
, in_slct_msg
);
1752 if (!esp
->esp_slowcmd
)
1753 for (i
= 0; i
< SCptr
->cmd_len
; i
++)
1754 *cmdp
++ = SCptr
->cmnd
[i
];
1757 if (esp
->erev
== fashme
)
1758 sbus_writeb((target
& 0xf) | (ESP_BUSID_RESELID
| ESP_BUSID_CTR32BIT
),
1759 esp
->eregs
+ ESP_BUSID
);
1761 sbus_writeb(target
& 7, esp
->eregs
+ ESP_BUSID
);
1762 if (esp
->prev_soff
!= SDptr
->sync_max_offset
||
1763 esp
->prev_stp
!= SDptr
->sync_min_period
||
1764 (esp
->erev
> esp100a
&&
1765 esp
->prev_cfg3
!= esp
->config3
[target
])) {
1766 esp
->prev_soff
= SDptr
->sync_max_offset
;
1767 esp
->prev_stp
= SDptr
->sync_min_period
;
1768 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
1769 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
1770 if (esp
->erev
> esp100a
) {
1771 esp
->prev_cfg3
= esp
->config3
[target
];
1772 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
1775 i
= (cmdp
- esp
->esp_command
);
1777 if (esp
->erev
== fashme
) {
1778 esp_cmd(esp
, ESP_CMD_FLUSH
); /* Grrr! */
1780 /* Set up the DMA and HME counters */
1781 sbus_writeb(i
, esp
->eregs
+ ESP_TCLOW
);
1782 sbus_writeb(0, esp
->eregs
+ ESP_TCMED
);
1783 sbus_writeb(0, esp
->eregs
+ FAS_RLO
);
1784 sbus_writeb(0, esp
->eregs
+ FAS_RHI
);
1785 esp_cmd(esp
, the_esp_command
);
1787 /* Talk about touchy hardware... */
1788 esp
->prev_hme_dmacsr
= ((esp
->prev_hme_dmacsr
|
1789 (DMA_SCSI_DISAB
| DMA_ENABLE
)) &
1791 sbus_writel(16, esp
->dregs
+ DMA_COUNT
);
1792 sbus_writel(esp
->esp_command_dvma
, esp
->dregs
+ DMA_ADDR
);
1793 sbus_writel(esp
->prev_hme_dmacsr
, esp
->dregs
+ DMA_CSR
);
1797 /* Set up the DMA and ESP counters */
1798 sbus_writeb(i
, esp
->eregs
+ ESP_TCLOW
);
1799 sbus_writeb(0, esp
->eregs
+ ESP_TCMED
);
1800 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
1801 tmp
&= ~DMA_ST_WRITE
;
1803 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
1804 if (esp
->dma
->revision
== dvmaesc1
) {
1805 if (i
) /* Workaround ESC gate array SBUS rerun bug. */
1806 sbus_writel(PAGE_SIZE
, esp
->dregs
+ DMA_COUNT
);
1808 sbus_writel(esp
->esp_command_dvma
, esp
->dregs
+ DMA_ADDR
);
1810 /* Tell ESP to "go". */
1811 esp_cmd(esp
, the_esp_command
);
1815 /* Queue a SCSI command delivered from the mid-level Linux SCSI code. */
1816 int esp_queue(Scsi_Cmnd
*SCpnt
, void (*done
)(Scsi_Cmnd
*))
1819 unsigned long flags
;
1821 /* Set up func ptr and initial driver cmd-phase. */
1822 SCpnt
->scsi_done
= done
;
1823 SCpnt
->SCp
.phase
= not_issued
;
1825 /* We use the scratch area. */
1826 ESPQUEUE(("esp_queue: target=%d lun=%d ", SCpnt
->target
, SCpnt
->lun
));
1827 ESPDISC(("N<%02x,%02x>", SCpnt
->target
, SCpnt
->lun
));
1829 esp
= (struct esp
*) SCpnt
->host
->hostdata
;
1830 esp_get_dmabufs(esp
, SCpnt
);
1831 esp_save_pointers(esp
, SCpnt
); /* FIXME for tag queueing */
1833 SCpnt
->SCp
.Status
= CHECK_CONDITION
;
1834 SCpnt
->SCp
.Message
= 0xff;
1835 SCpnt
->SCp
.sent_command
= 0;
1837 spin_lock_irqsave(&esp
->lock
, flags
);
1839 /* Place into our queue. */
1840 if (SCpnt
->cmnd
[0] == REQUEST_SENSE
) {
1841 ESPQUEUE(("RQSENSE\n"));
1842 prepend_SC(&esp
->issue_SC
, SCpnt
);
1845 append_SC(&esp
->issue_SC
, SCpnt
);
1848 /* Run it now if we can. */
1849 if (!esp
->current_SC
&& !esp
->resetting_bus
)
1852 spin_unlock_irqrestore(&esp
->lock
, flags
);
1857 /* Only queuing supported in this ESP driver. */
1858 int esp_command(Scsi_Cmnd
*SCpnt
)
1860 struct esp
*esp
= (struct esp
*) SCpnt
->host
->hostdata
;
1862 ESPLOG(("esp%d: esp_command() called...\n", esp
->esp_id
));
1866 /* Dump driver state. */
1867 static void esp_dump_cmd(Scsi_Cmnd
*SCptr
)
1869 ESPLOG(("[tgt<%02x> lun<%02x> "
1870 "pphase<%s> cphase<%s>]",
1871 SCptr
->target
, SCptr
->lun
,
1872 phase_string(SCptr
->SCp
.sent_command
),
1873 phase_string(SCptr
->SCp
.phase
)));
1876 static void esp_dump_state(struct esp
*esp
)
1878 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
1879 #ifdef DEBUG_ESP_CMDS
1883 ESPLOG(("esp%d: dumping state\n", esp
->esp_id
));
1884 ESPLOG(("esp%d: dma -- cond_reg<%08x> addr<%08x>\n",
1886 sbus_readl(esp
->dregs
+ DMA_CSR
),
1887 sbus_readl(esp
->dregs
+ DMA_ADDR
)));
1888 ESPLOG(("esp%d: SW [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
1889 esp
->esp_id
, esp
->sreg
, esp
->seqreg
, esp
->ireg
));
1890 ESPLOG(("esp%d: HW reread [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
1892 sbus_readb(esp
->eregs
+ ESP_STATUS
),
1893 sbus_readb(esp
->eregs
+ ESP_SSTEP
),
1894 sbus_readb(esp
->eregs
+ ESP_INTRPT
)));
1895 #ifdef DEBUG_ESP_CMDS
1896 printk("esp%d: last ESP cmds [", esp
->esp_id
);
1897 i
= (esp
->espcmdent
- 1) & 31;
1898 printk("<"); esp_print_cmd(esp
->espcmdlog
[i
]); printk(">");
1900 printk("<"); esp_print_cmd(esp
->espcmdlog
[i
]); printk(">");
1902 printk("<"); esp_print_cmd(esp
->espcmdlog
[i
]); printk(">");
1904 printk("<"); esp_print_cmd(esp
->espcmdlog
[i
]); printk(">");
1906 #endif /* (DEBUG_ESP_CMDS) */
1909 ESPLOG(("esp%d: current command ", esp
->esp_id
));
1910 esp_dump_cmd(SCptr
);
1913 SCptr
= esp
->disconnected_SC
;
1914 ESPLOG(("esp%d: disconnected ", esp
->esp_id
));
1916 esp_dump_cmd(SCptr
);
1917 SCptr
= (Scsi_Cmnd
*) SCptr
->host_scribble
;
1922 /* Abort a command. */
1923 int esp_abort(Scsi_Cmnd
*SCptr
)
1925 struct esp
*esp
= (struct esp
*) SCptr
->host
->hostdata
;
1926 unsigned long flags
;
1929 spin_lock_irqsave(&esp
->lock
, flags
);
1931 ESPLOG(("esp%d: Aborting command\n", esp
->esp_id
));
1932 esp_dump_state(esp
);
1934 /* Wheee, if this is the current command on the bus, the
1935 * best we can do is assert ATN and wait for msgout phase.
1936 * This should even fix a hung SCSI bus when we lose state
1937 * in the driver and timeout because the eventual phase change
1938 * will cause the ESP to (eventually) give an interrupt.
1940 if (esp
->current_SC
== SCptr
) {
1941 esp
->cur_msgout
[0] = ABORT
;
1942 esp
->msgout_len
= 1;
1943 esp
->msgout_ctr
= 0;
1944 esp_cmd(esp
, ESP_CMD_SATN
);
1945 spin_unlock_irqrestore(&esp
->lock
, flags
);
1946 return SCSI_ABORT_PENDING
;
1949 /* If it is still in the issue queue then we can safely
1950 * call the completion routine and report abort success.
1952 don
= (sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_INT_ENAB
);
1954 ESP_INTSOFF(esp
->dregs
);
1956 if (esp
->issue_SC
) {
1957 Scsi_Cmnd
**prev
, *this;
1958 for (prev
= (&esp
->issue_SC
), this = esp
->issue_SC
;
1960 prev
= (Scsi_Cmnd
**) &(this->host_scribble
),
1961 this = (Scsi_Cmnd
*) this->host_scribble
) {
1963 if (this == SCptr
) {
1964 *prev
= (Scsi_Cmnd
*) this->host_scribble
;
1965 this->host_scribble
= NULL
;
1967 spin_unlock_irqrestore(&esp
->lock
, flags
);
1969 esp_release_dmabufs(esp
, this);
1970 this->result
= DID_ABORT
<< 16;
1971 this->scsi_done(this);
1973 ESP_INTSON(esp
->dregs
);
1975 return SCSI_ABORT_SUCCESS
;
1980 /* Yuck, the command to abort is disconnected, it is not
1981 * worth trying to abort it now if something else is live
1982 * on the bus at this time. So, we let the SCSI code wait
1983 * a little bit and try again later.
1985 if (esp
->current_SC
) {
1987 ESP_INTSON(esp
->dregs
);
1988 spin_unlock_irqrestore(&esp
->lock
, flags
);
1989 return SCSI_ABORT_BUSY
;
1992 /* It's disconnected, we have to reconnect to re-establish
1993 * the nexus and tell the device to abort. However, we really
1994 * cannot 'reconnect' per se, therefore we tell the upper layer
1995 * the safest thing we can. This is, wait a bit, if nothing
1996 * happens, we are really hung so reset the bus.
2000 ESP_INTSON(esp
->dregs
);
2001 spin_unlock_irqrestore(&esp
->lock
, flags
);
2002 return SCSI_ABORT_SNOOZE
;
2005 /* We've sent ESP_CMD_RS to the ESP, the interrupt had just
2006 * arrived indicating the end of the SCSI bus reset. Our job
2007 * is to clean out the command queues and begin re-execution
2008 * of SCSI commands once more.
2010 static int esp_finish_reset(struct esp
*esp
)
2012 Scsi_Cmnd
*sp
= esp
->current_SC
;
2014 /* Clean up currently executing command, if any. */
2016 esp
->current_SC
= NULL
;
2017 spin_unlock(&esp
->lock
);
2019 esp_release_dmabufs(esp
, sp
);
2020 sp
->result
= (DID_RESET
<< 16);
2022 spin_lock(&io_request_lock
);
2024 spin_unlock(&io_request_lock
);
2026 spin_lock(&esp
->lock
);
2029 /* Clean up disconnected queue, they have been invalidated
2032 if (esp
->disconnected_SC
) {
2033 while ((sp
= remove_first_SC(&esp
->disconnected_SC
)) != NULL
) {
2034 spin_unlock(&esp
->lock
);
2036 esp_release_dmabufs(esp
, sp
);
2037 sp
->result
= (DID_RESET
<< 16);
2039 spin_lock(&io_request_lock
);
2041 spin_unlock(&io_request_lock
);
2043 spin_lock(&esp
->lock
);
2047 /* SCSI bus reset is complete. */
2048 esp
->resetting_bus
= 0;
2050 /* Ok, now it is safe to get commands going once more. */
2057 static int esp_do_resetbus(struct esp
*esp
)
2059 ESPLOG(("esp%d: Resetting scsi bus\n", esp
->esp_id
));
2060 esp
->resetting_bus
= 1;
2061 esp_cmd(esp
, ESP_CMD_RS
);
2066 /* Reset ESP chip, reset hanging bus, then kill active and
2067 * disconnected commands for targets without soft reset.
2069 int esp_reset(Scsi_Cmnd
*SCptr
, unsigned int how
)
2071 struct esp
*esp
= (struct esp
*) SCptr
->host
->hostdata
;
2072 unsigned long flags
;
2074 spin_lock_irqsave(&esp
->lock
, flags
);
2075 (void) esp_do_resetbus(esp
);
2076 spin_unlock_irqrestore(&esp
->lock
, flags
);
2078 return SCSI_RESET_PENDING
;
2081 /* Internal ESP done function. */
2082 static void esp_done(struct esp
*esp
, int error
)
2084 Scsi_Cmnd
*done_SC
= esp
->current_SC
;
2086 esp
->current_SC
= NULL
;
2088 spin_unlock(&esp
->lock
);
2089 esp_release_dmabufs(esp
, done_SC
);
2090 done_SC
->result
= error
;
2092 spin_lock(&io_request_lock
);
2093 done_SC
->scsi_done(done_SC
);
2094 spin_unlock(&io_request_lock
);
2096 /* Bus is free, issue any commands in the queue. */
2097 spin_lock(&esp
->lock
);
2098 if (esp
->issue_SC
&& !esp
->current_SC
)
2103 /* Wheee, ESP interrupt engine. */
2105 /* Forward declarations. */
2106 static int esp_do_phase_determine(struct esp
*esp
);
2107 static int esp_do_data_finale(struct esp
*esp
);
2108 static int esp_select_complete(struct esp
*esp
);
2109 static int esp_do_status(struct esp
*esp
);
2110 static int esp_do_msgin(struct esp
*esp
);
2111 static int esp_do_msgindone(struct esp
*esp
);
2112 static int esp_do_msgout(struct esp
*esp
);
2113 static int esp_do_cmdbegin(struct esp
*esp
);
2115 #define sreg_datainp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DIP)
2116 #define sreg_dataoutp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DOP)
2118 /* Read any bytes found in the FAS366 fifo, storing them into
2119 * the ESP driver software state structure.
2121 static void hme_fifo_read(struct esp
*esp
)
2124 u8 status
= esp
->sreg
;
2126 /* Cannot safely frob the fifo for these following cases, but
2127 * we must always read the fifo when the reselect interrupt
2130 if (((esp
->ireg
& ESP_INTR_RSEL
) == 0) &&
2131 (sreg_datainp(status
) ||
2132 sreg_dataoutp(status
) ||
2134 esp
->current_SC
->SCp
.phase
== in_data_done
))) {
2135 ESPHME(("<wkaround_skipped>"));
2137 unsigned long fcnt
= sbus_readb(esp
->eregs
+ ESP_FFLAGS
) & ESP_FF_FBYTES
;
2139 /* The HME stores bytes in multiples of 2 in the fifo. */
2140 ESPHME(("hme_fifo[fcnt=%d", (int)fcnt
));
2142 esp
->hme_fifo_workaround_buffer
[count
++] =
2143 sbus_readb(esp
->eregs
+ ESP_FDATA
);
2144 esp
->hme_fifo_workaround_buffer
[count
++] =
2145 sbus_readb(esp
->eregs
+ ESP_FDATA
);
2146 ESPHME(("<%02x,%02x>", esp
->hme_fifo_workaround_buffer
[count
-2], esp
->hme_fifo_workaround_buffer
[count
-1]));
2149 if (sbus_readb(esp
->eregs
+ ESP_STATUS2
) & ESP_STAT2_F1BYTE
) {
2150 ESPHME(("<poke_byte>"));
2151 sbus_writeb(0, esp
->eregs
+ ESP_FDATA
);
2152 esp
->hme_fifo_workaround_buffer
[count
++] =
2153 sbus_readb(esp
->eregs
+ ESP_FDATA
);
2154 ESPHME(("<%02x,0x00>", esp
->hme_fifo_workaround_buffer
[count
-1]));
2155 ESPHME(("CMD_FLUSH"));
2156 esp_cmd(esp
, ESP_CMD_FLUSH
);
2158 ESPHME(("no_xtra_byte"));
2161 ESPHME(("wkarnd_cnt=%d]", (int)count
));
2162 esp
->hme_fifo_workaround_count
= count
;
2165 static inline void hme_fifo_push(struct esp
*esp
, u8
*bytes
, u8 count
)
2167 esp_cmd(esp
, ESP_CMD_FLUSH
);
2170 sbus_writeb(tmp
, esp
->eregs
+ ESP_FDATA
);
2171 sbus_writeb(0, esp
->eregs
+ ESP_FDATA
);
2176 /* We try to avoid some interrupts by jumping ahead and see if the ESP
2177 * has gotten far enough yet. Hence the following.
2179 static inline int skipahead1(struct esp
*esp
, Scsi_Cmnd
*scp
,
2180 int prev_phase
, int new_phase
)
2182 if (scp
->SCp
.sent_command
!= prev_phase
)
2184 if (ESP_IRQ_P(esp
->dregs
)) {
2185 /* Yes, we are able to save an interrupt. */
2186 if (esp
->erev
== fashme
)
2187 esp
->sreg2
= sbus_readb(esp
->eregs
+ ESP_STATUS2
);
2188 esp
->sreg
= (sbus_readb(esp
->eregs
+ ESP_STATUS
) & ~(ESP_STAT_INTR
));
2189 esp
->ireg
= sbus_readb(esp
->eregs
+ ESP_INTRPT
);
2190 if (esp
->erev
== fashme
) {
2191 /* This chip is really losing. */
2193 /* Must latch fifo before reading the interrupt
2194 * register else garbage ends up in the FIFO
2195 * which confuses the driver utterly.
2196 * Happy Meal indeed....
2198 ESPHME(("fifo_workaround]"));
2199 if (!(esp
->sreg2
& ESP_STAT2_FEMPTY
) ||
2200 (esp
->sreg2
& ESP_STAT2_F1BYTE
))
2203 if (!(esp
->ireg
& ESP_INTR_SR
))
2206 return do_reset_complete
;
2208 /* Ho hum, target is taking forever... */
2209 scp
->SCp
.sent_command
= new_phase
; /* so we don't recurse... */
2213 static inline int skipahead2(struct esp
*esp
, Scsi_Cmnd
*scp
,
2214 int prev_phase1
, int prev_phase2
, int new_phase
)
2216 if (scp
->SCp
.sent_command
!= prev_phase1
&&
2217 scp
->SCp
.sent_command
!= prev_phase2
)
2219 if (ESP_IRQ_P(esp
->dregs
)) {
2220 /* Yes, we are able to save an interrupt. */
2221 if (esp
->erev
== fashme
)
2222 esp
->sreg2
= sbus_readb(esp
->eregs
+ ESP_STATUS2
);
2223 esp
->sreg
= (sbus_readb(esp
->eregs
+ ESP_STATUS
) & ~(ESP_STAT_INTR
));
2224 esp
->ireg
= sbus_readb(esp
->eregs
+ ESP_INTRPT
);
2225 if (esp
->erev
== fashme
) {
2226 /* This chip is really losing. */
2229 /* Must latch fifo before reading the interrupt
2230 * register else garbage ends up in the FIFO
2231 * which confuses the driver utterly.
2232 * Happy Meal indeed....
2234 ESPHME(("fifo_workaround]"));
2235 if (!(esp
->sreg2
& ESP_STAT2_FEMPTY
) ||
2236 (esp
->sreg2
& ESP_STAT2_F1BYTE
))
2239 if (!(esp
->ireg
& ESP_INTR_SR
))
2242 return do_reset_complete
;
2244 /* Ho hum, target is taking forever... */
2245 scp
->SCp
.sent_command
= new_phase
; /* so we don't recurse... */
2249 /* Now some dma helpers. */
2250 static void dma_setup(struct esp
*esp
, __u32 addr
, int count
, int write
)
2252 u32 nreg
= sbus_readl(esp
->dregs
+ DMA_CSR
);
2255 nreg
|= DMA_ST_WRITE
;
2257 nreg
&= ~(DMA_ST_WRITE
);
2259 sbus_writel(nreg
, esp
->dregs
+ DMA_CSR
);
2260 if (esp
->dma
->revision
== dvmaesc1
) {
2261 /* This ESC gate array sucks! */
2263 __u32 dest
= src
+ count
;
2265 if (dest
& (PAGE_SIZE
- 1))
2266 count
= PAGE_ALIGN(count
);
2267 sbus_writel(count
, esp
->dregs
+ DMA_COUNT
);
2269 sbus_writel(addr
, esp
->dregs
+ DMA_ADDR
);
2272 static void dma_drain(struct esp
*esp
)
2276 if (esp
->dma
->revision
== dvmahme
)
2278 if ((tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
)) & DMA_FIFO_ISDRAIN
) {
2279 switch (esp
->dma
->revision
) {
2281 tmp
|= DMA_FIFO_STDRAIN
;
2282 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
2286 while (sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_FIFO_ISDRAIN
)
2292 static void dma_invalidate(struct esp
*esp
)
2296 if (esp
->dma
->revision
== dvmahme
) {
2297 sbus_writel(DMA_RST_SCSI
, esp
->dregs
+ DMA_CSR
);
2299 esp
->prev_hme_dmacsr
= ((esp
->prev_hme_dmacsr
|
2300 (DMA_PARITY_OFF
| DMA_2CLKS
|
2301 DMA_SCSI_DISAB
| DMA_INT_ENAB
)) &
2302 ~(DMA_ST_WRITE
| DMA_ENABLE
));
2304 sbus_writel(0, esp
->dregs
+ DMA_CSR
);
2305 sbus_writel(esp
->prev_hme_dmacsr
, esp
->dregs
+ DMA_CSR
);
2307 /* This is necessary to avoid having the SCSI channel
2308 * engine lock up on us.
2310 sbus_writel(0, esp
->dregs
+ DMA_ADDR
);
2312 while ((tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
)) & DMA_PEND_READ
)
2315 tmp
&= ~(DMA_ENABLE
| DMA_ST_WRITE
| DMA_BCNT_ENAB
);
2316 tmp
|= DMA_FIFO_INV
;
2317 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
2318 tmp
&= ~DMA_FIFO_INV
;
2319 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
2323 static inline void dma_flashclear(struct esp
*esp
)
2326 dma_invalidate(esp
);
2329 static int dma_can_transfer(struct esp
*esp
, Scsi_Cmnd
*sp
)
2331 __u32 base
, end
, sz
;
2333 if (esp
->dma
->revision
== dvmarev3
) {
2334 sz
= sp
->SCp
.this_residual
;
2338 base
= ((__u32
)((unsigned long)sp
->SCp
.ptr
));
2339 base
&= (0x1000000 - 1);
2340 end
= (base
+ sp
->SCp
.this_residual
);
2341 if (end
> 0x1000000)
2348 /* Misc. esp helper macros. */
2349 #define esp_setcount(__eregs, __cnt, __hme) \
2350 sbus_writeb(((__cnt)&0xff), (__eregs) + ESP_TCLOW); \
2351 sbus_writeb((((__cnt)>>8)&0xff), (__eregs) + ESP_TCMED); \
2353 sbus_writeb((((__cnt)>>16)&0xff), (__eregs) + FAS_RLO); \
2354 sbus_writeb(0, (__eregs) + FAS_RHI); \
2357 #define esp_getcount(__eregs, __hme) \
2358 ((sbus_readb((__eregs) + ESP_TCLOW)&0xff) | \
2359 ((sbus_readb((__eregs) + ESP_TCMED)&0xff) << 8) | \
2360 ((__hme) ? sbus_readb((__eregs) + FAS_RLO) << 16 : 0))
2362 #define fcount(__esp) \
2363 (((__esp)->erev == fashme) ? \
2364 (__esp)->hme_fifo_workaround_count : \
2365 sbus_readb(((__esp)->eregs) + ESP_FFLAGS) & ESP_FF_FBYTES)
2367 #define fnzero(__esp) \
2368 (((__esp)->erev == fashme) ? 0 : \
2369 sbus_readb(((__esp)->eregs) + ESP_FFLAGS) & ESP_FF_ONOTZERO)
2371 /* XXX speculative nops unnecessary when continuing amidst a data phase
2372 * XXX even on esp100!!! another case of flooding the bus with I/O reg
2375 #define esp_maybe_nop(__esp) \
2376 if ((__esp)->erev == esp100) \
2377 esp_cmd((__esp), ESP_CMD_NULL)
2379 #define sreg_to_dataphase(__sreg) \
2380 ((((__sreg) & ESP_STAT_PMASK) == ESP_DOP) ? in_dataout : in_datain)
2382 /* The ESP100 when in synchronous data phase, can mistake a long final
2383 * REQ pulse from the target as an extra byte, it places whatever is on
2384 * the data lines into the fifo. For now, we will assume when this
2385 * happens that the target is a bit quirky and we don't want to
2386 * be talking synchronously to it anyways. Regardless, we need to
2387 * tell the ESP to eat the extraneous byte so that we can proceed
2388 * to the next phase.
2390 static int esp100_sync_hwbug(struct esp
*esp
, Scsi_Cmnd
*sp
, int fifocnt
)
2392 /* Do not touch this piece of code. */
2393 if ((!(esp
->erev
== esp100
)) ||
2394 (!(sreg_datainp((esp
->sreg
= sbus_readb(esp
->eregs
+ ESP_STATUS
))) &&
2396 !(sreg_dataoutp(esp
->sreg
) && !fnzero(esp
)))) {
2397 if (sp
->SCp
.phase
== in_dataout
)
2398 esp_cmd(esp
, ESP_CMD_FLUSH
);
2401 /* Async mode for this guy. */
2402 build_sync_nego_msg(esp
, 0, 0);
2404 /* Ack the bogus byte, but set ATN first. */
2405 esp_cmd(esp
, ESP_CMD_SATN
);
2406 esp_cmd(esp
, ESP_CMD_MOK
);
2411 /* This closes the window during a selection with a reselect pending, because
2412 * we use DMA for the selection process the FIFO should hold the correct
2413 * contents if we get reselected during this process. So we just need to
2414 * ack the possible illegal cmd interrupt pending on the esp100.
2416 static inline int esp100_reconnect_hwbug(struct esp
*esp
)
2420 if (esp
->erev
!= esp100
)
2422 tmp
= sbus_readb(esp
->eregs
+ ESP_INTRPT
);
2423 if (tmp
& ESP_INTR_SR
)
2428 /* This verifies the BUSID bits during a reselection so that we know which
2429 * target is talking to us.
2431 static inline int reconnect_target(struct esp
*esp
)
2433 int it
, me
= esp
->scsi_id_mask
, targ
= 0;
2435 if (2 != fcount(esp
))
2437 if (esp
->erev
== fashme
) {
2438 /* HME does not latch it's own BUS ID bits during
2439 * a reselection. Also the target number is given
2440 * as an unsigned char, not as a sole bit number
2441 * like the other ESP's do.
2442 * Happy Meal indeed....
2444 targ
= esp
->hme_fifo_workaround_buffer
[0];
2446 it
= sbus_readb(esp
->eregs
+ ESP_FDATA
);
2458 /* This verifies the identify from the target so that we know which lun is
2459 * being reconnected.
2461 static inline int reconnect_lun(struct esp
*esp
)
2465 if ((esp
->sreg
& ESP_STAT_PMASK
) != ESP_MIP
)
2467 if (esp
->erev
== fashme
)
2468 lun
= esp
->hme_fifo_workaround_buffer
[1];
2470 lun
= sbus_readb(esp
->eregs
+ ESP_FDATA
);
2472 /* Yes, you read this correctly. We report lun of zero
2473 * if we see parity error. ESP reports parity error for
2474 * the lun byte, and this is the only way to hope to recover
2475 * because the target is connected.
2477 if (esp
->sreg
& ESP_STAT_PERR
)
2480 /* Check for illegal bits being set in the lun. */
2481 if ((lun
& 0x40) || !(lun
& 0x80))
2487 /* This puts the driver in a state where it can revitalize a command that
2488 * is being continued due to reselection.
2490 static inline void esp_connect(struct esp
*esp
, Scsi_Cmnd
*sp
)
2492 Scsi_Device
*dp
= sp
->device
;
2494 if (esp
->prev_soff
!= dp
->sync_max_offset
||
2495 esp
->prev_stp
!= dp
->sync_min_period
||
2496 (esp
->erev
> esp100a
&&
2497 esp
->prev_cfg3
!= esp
->config3
[sp
->target
])) {
2498 esp
->prev_soff
= dp
->sync_max_offset
;
2499 esp
->prev_stp
= dp
->sync_min_period
;
2500 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
2501 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
2502 if (esp
->erev
> esp100a
) {
2503 esp
->prev_cfg3
= esp
->config3
[sp
->target
];
2504 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
2507 esp
->current_SC
= sp
;
2510 /* This will place the current working command back into the issue queue
2511 * if we are to receive a reselection amidst a selection attempt.
2513 static inline void esp_reconnect(struct esp
*esp
, Scsi_Cmnd
*sp
)
2515 if (!esp
->disconnected_SC
)
2516 ESPLOG(("esp%d: Weird, being reselected but disconnected "
2517 "command queue is empty.\n", esp
->esp_id
));
2519 esp
->current_SC
= 0;
2520 sp
->SCp
.phase
= not_issued
;
2521 append_SC(&esp
->issue_SC
, sp
);
2524 /* Begin message in phase. */
2525 static int esp_do_msgin(struct esp
*esp
)
2527 /* Must be very careful with the fifo on the HME */
2528 if ((esp
->erev
!= fashme
) ||
2529 !(sbus_readb(esp
->eregs
+ ESP_STATUS2
) & ESP_STAT2_FEMPTY
))
2530 esp_cmd(esp
, ESP_CMD_FLUSH
);
2532 esp_cmd(esp
, ESP_CMD_TI
);
2535 esp_advance_phase(esp
->current_SC
, in_msgindone
);
2539 /* This uses various DMA csr fields and the fifo flags count value to
2540 * determine how many bytes were successfully sent/received by the ESP.
2542 static inline int esp_bytes_sent(struct esp
*esp
, int fifo_count
)
2544 int rval
= sbus_readl(esp
->dregs
+ DMA_ADDR
) - esp
->esp_command_dvma
;
2546 if (esp
->dma
->revision
== dvmarev1
)
2547 rval
-= (4 - ((sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_READ_AHEAD
)>>11));
2548 return rval
- fifo_count
;
2551 static inline void advance_sg(Scsi_Cmnd
*sp
)
2554 --sp
->SCp
.buffers_residual
;
2555 sp
->SCp
.this_residual
= sg_dma_len(sp
->SCp
.buffer
);
2556 sp
->SCp
.ptr
= (char *)((unsigned long)sg_dma_address(sp
->SCp
.buffer
));
2559 /* Please note that the way I've coded these routines is that I _always_
2560 * check for a disconnect during any and all information transfer
2561 * phases. The SCSI standard states that the target _can_ cause a BUS
2562 * FREE condition by dropping all MSG/CD/IO/BSY signals. Also note
2563 * that during information transfer phases the target controls every
2564 * change in phase, the only thing the initiator can do is "ask" for
2565 * a message out phase by driving ATN true. The target can, and sometimes
2566 * will, completely ignore this request so we cannot assume anything when
2567 * we try to force a message out phase to abort/reset a target. Most of
2568 * the time the target will eventually be nice and go to message out, so
2569 * we may have to hold on to our state about what we want to tell the target
2570 * for some period of time.
2573 /* I think I have things working here correctly. Even partial transfers
2574 * within a buffer or sub-buffer should not upset us at all no matter
2575 * how bad the target and/or ESP fucks things up.
2577 static int esp_do_data(struct esp
*esp
)
2579 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
2580 int thisphase
, hmuch
;
2582 ESPDATA(("esp_do_data: "));
2584 thisphase
= sreg_to_dataphase(esp
->sreg
);
2585 esp_advance_phase(SCptr
, thisphase
);
2586 ESPDATA(("newphase<%s> ", (thisphase
== in_datain
) ? "DATAIN" : "DATAOUT"));
2587 hmuch
= dma_can_transfer(esp
, SCptr
);
2588 if (hmuch
> (64 * 1024) && (esp
->erev
!= fashme
))
2589 hmuch
= (64 * 1024);
2590 ESPDATA(("hmuch<%d> ", hmuch
));
2591 esp
->current_transfer_size
= hmuch
;
2593 if (esp
->erev
== fashme
) {
2594 u32 tmp
= esp
->prev_hme_dmacsr
;
2596 /* Always set the ESP count registers first. */
2597 esp_setcount(esp
->eregs
, hmuch
, 1);
2599 /* Get the DMA csr computed. */
2600 tmp
|= (DMA_SCSI_DISAB
| DMA_ENABLE
);
2601 if (thisphase
== in_datain
)
2602 tmp
|= DMA_ST_WRITE
;
2604 tmp
&= ~(DMA_ST_WRITE
);
2605 esp
->prev_hme_dmacsr
= tmp
;
2607 ESPDATA(("DMA|TI --> do_intr_end\n"));
2608 if (thisphase
== in_datain
) {
2609 sbus_writel(hmuch
, esp
->dregs
+ DMA_COUNT
);
2610 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
2612 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
2613 sbus_writel(hmuch
, esp
->dregs
+ DMA_COUNT
);
2615 sbus_writel((__u32
)((unsigned long)SCptr
->SCp
.ptr
), esp
->dregs
+DMA_ADDR
);
2616 sbus_writel(esp
->prev_hme_dmacsr
, esp
->dregs
+ DMA_CSR
);
2618 esp_setcount(esp
->eregs
, hmuch
, 0);
2619 dma_setup(esp
, ((__u32
)((unsigned long)SCptr
->SCp
.ptr
)),
2620 hmuch
, (thisphase
== in_datain
));
2621 ESPDATA(("DMA|TI --> do_intr_end\n"));
2622 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
2627 /* See how successful the data transfer was. */
2628 static int esp_do_data_finale(struct esp
*esp
)
2630 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
2631 int bogus_data
= 0, bytes_sent
= 0, fifocnt
, ecount
= 0;
2633 ESPDATA(("esp_do_data_finale: "));
2635 if (SCptr
->SCp
.phase
== in_datain
) {
2636 if (esp
->sreg
& ESP_STAT_PERR
) {
2637 /* Yuck, parity error. The ESP asserts ATN
2638 * so that we can go to message out phase
2639 * immediately and inform the target that
2640 * something bad happened.
2642 ESPLOG(("esp%d: data bad parity detected.\n",
2644 esp
->cur_msgout
[0] = INITIATOR_ERROR
;
2645 esp
->msgout_len
= 1;
2649 dma_invalidate(esp
);
2651 /* This could happen for the above parity error case. */
2652 if (esp
->ireg
!= ESP_INTR_BSERV
) {
2653 /* Please go to msgout phase, please please please... */
2654 ESPLOG(("esp%d: !BSERV after data, probably to msgout\n",
2656 return esp_do_phase_determine(esp
);
2659 /* Check for partial transfers and other horrible events.
2660 * Note, here we read the real fifo flags register even
2661 * on HME broken adapters because we skip the HME fifo
2662 * workaround code in esp_handle() if we are doing data
2663 * phase things. We don't want to fuck directly with
2664 * the fifo like that, especially if doing synchronous
2665 * transfers! Also, will need to double the count on
2666 * HME if we are doing wide transfers, as the HME fifo
2667 * will move and count 16-bit quantities during wide data.
2668 * SMCC _and_ Qlogic can both bite me.
2670 fifocnt
= (sbus_readb(esp
->eregs
+ ESP_FFLAGS
) & ESP_FF_FBYTES
);
2671 if (esp
->erev
!= fashme
)
2672 ecount
= esp_getcount(esp
->eregs
, 0);
2673 bytes_sent
= esp
->current_transfer_size
;
2675 ESPDATA(("trans_sz(%d), ", bytes_sent
));
2676 if (esp
->erev
== fashme
) {
2677 if (!(esp
->sreg
& ESP_STAT_TCNT
)) {
2678 ecount
= esp_getcount(esp
->eregs
, 1);
2679 bytes_sent
-= ecount
;
2682 /* Always subtract any cruft remaining in the FIFO. */
2683 if (esp
->prev_cfg3
& ESP_CONFIG3_EWIDE
)
2685 if (SCptr
->SCp
.phase
== in_dataout
)
2686 bytes_sent
-= fifocnt
;
2688 /* I have an IBM disk which exhibits the following
2689 * behavior during writes to it. It disconnects in
2690 * the middle of a partial transfer, the current sglist
2691 * buffer is 1024 bytes, the disk stops data transfer
2694 * However the FAS366 reports that 32 more bytes were
2695 * transferred than really were. This is precisely
2696 * the size of a fully loaded FIFO in wide scsi mode.
2697 * The FIFO state recorded indicates that it is empty.
2699 * I have no idea if this is a bug in the FAS366 chip
2700 * or a bug in the firmware on this IBM disk. In any
2701 * event the following seems to be a good workaround. -DaveM
2703 if (bytes_sent
!= esp
->current_transfer_size
&&
2704 SCptr
->SCp
.phase
== in_dataout
) {
2705 int mask
= (64 - 1);
2707 if ((esp
->prev_cfg3
& ESP_CONFIG3_EWIDE
) == 0)
2710 if (bytes_sent
& mask
)
2711 bytes_sent
-= (bytes_sent
& mask
);
2714 if (!(esp
->sreg
& ESP_STAT_TCNT
))
2715 bytes_sent
-= ecount
;
2716 if (SCptr
->SCp
.phase
== in_dataout
)
2717 bytes_sent
-= fifocnt
;
2720 ESPDATA(("bytes_sent(%d), ", bytes_sent
));
2722 /* If we were in synchronous mode, check for peculiarities. */
2723 if (esp
->erev
== fashme
) {
2724 if (SCptr
->device
->sync_max_offset
) {
2725 if (SCptr
->SCp
.phase
== in_dataout
)
2726 esp_cmd(esp
, ESP_CMD_FLUSH
);
2728 esp_cmd(esp
, ESP_CMD_FLUSH
);
2731 if (SCptr
->device
->sync_max_offset
)
2732 bogus_data
= esp100_sync_hwbug(esp
, SCptr
, fifocnt
);
2734 esp_cmd(esp
, ESP_CMD_FLUSH
);
2737 /* Until we are sure of what has happened, we are certainly
2740 esp_advance_phase(SCptr
, in_the_dark
);
2742 if (bytes_sent
< 0) {
2743 /* I've seen this happen due to lost state in this
2744 * driver. No idea why it happened, but allowing
2745 * this value to be negative caused things to
2746 * lock up. This allows greater chance of recovery.
2747 * In fact every time I've seen this, it has been
2748 * a driver bug without question.
2750 ESPLOG(("esp%d: yieee, bytes_sent < 0!\n", esp
->esp_id
));
2751 ESPLOG(("esp%d: csz=%d fifocount=%d ecount=%d\n",
2753 esp
->current_transfer_size
, fifocnt
, ecount
));
2754 ESPLOG(("esp%d: use_sg=%d ptr=%p this_residual=%d\n",
2756 SCptr
->use_sg
, SCptr
->SCp
.ptr
, SCptr
->SCp
.this_residual
));
2757 ESPLOG(("esp%d: Forcing async for target %d\n", esp
->esp_id
,
2759 SCptr
->device
->borken
= 1;
2760 SCptr
->device
->sync
= 0;
2764 /* Update the state of our transfer. */
2765 SCptr
->SCp
.ptr
+= bytes_sent
;
2766 SCptr
->SCp
.this_residual
-= bytes_sent
;
2767 if (SCptr
->SCp
.this_residual
< 0) {
2769 ESPLOG(("esp%d: Data transfer overrun.\n", esp
->esp_id
));
2770 SCptr
->SCp
.this_residual
= 0;
2773 /* Maybe continue. */
2775 ESPDATA(("!bogus_data, "));
2777 /* NO MATTER WHAT, we advance the scatterlist,
2778 * if the target should decide to disconnect
2779 * in between scatter chunks (which is common)
2780 * we could die horribly! I used to have the sg
2781 * advance occur only if we are going back into
2782 * (or are staying in) a data phase, you can
2783 * imagine the hell I went through trying to
2786 if (SCptr
->use_sg
&& !SCptr
->SCp
.this_residual
)
2788 if (sreg_datainp(esp
->sreg
) || sreg_dataoutp(esp
->sreg
)) {
2789 ESPDATA(("to more data\n"));
2790 return esp_do_data(esp
);
2792 ESPDATA(("to new phase\n"));
2793 return esp_do_phase_determine(esp
);
2795 /* Bogus data, just wait for next interrupt. */
2796 ESPLOG(("esp%d: bogus_data during end of data phase\n",
2801 /* We received a non-good status return at the end of
2802 * running a SCSI command. This is used to decide if
2803 * we should clear our synchronous transfer state for
2804 * such a device when that happens.
2806 * The idea is that when spinning up a disk or rewinding
2807 * a tape, we don't want to go into a loop re-negotiating
2808 * synchronous capabilities over and over.
2810 static int esp_should_clear_sync(Scsi_Cmnd
*sp
)
2812 u8 cmd1
= sp
->cmnd
[0];
2813 u8 cmd2
= sp
->data_cmnd
[0];
2815 /* These cases are for spinning up a disk and
2816 * waiting for that spinup to complete.
2818 if (cmd1
== START_STOP
||
2822 if (cmd1
== TEST_UNIT_READY
||
2823 cmd2
== TEST_UNIT_READY
)
2826 /* One more special case for SCSI tape drives,
2827 * this is what is used to probe the device for
2828 * completion of a rewind or tape load operation.
2830 if (sp
->device
->type
== TYPE_TAPE
) {
2831 if (cmd1
== MODE_SENSE
||
2839 /* Either a command is completing or a target is dropping off the bus
2840 * to continue the command in the background so we can do other work.
2842 static int esp_do_freebus(struct esp
*esp
)
2844 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
2847 rval
= skipahead2(esp
, SCptr
, in_status
, in_msgindone
, in_freeing
);
2850 if (esp
->ireg
!= ESP_INTR_DC
) {
2851 ESPLOG(("esp%d: Target will not disconnect\n", esp
->esp_id
));
2852 return do_reset_bus
; /* target will not drop BSY... */
2854 esp
->msgout_len
= 0;
2855 esp
->prevmsgout
= NOP
;
2856 if (esp
->prevmsgin
== COMMAND_COMPLETE
) {
2857 /* Normal end of nexus. */
2858 if (esp
->disconnected_SC
|| (esp
->erev
== fashme
))
2859 esp_cmd(esp
, ESP_CMD_ESEL
);
2861 if (SCptr
->SCp
.Status
!= GOOD
&&
2862 SCptr
->SCp
.Status
!= CONDITION_GOOD
&&
2863 ((1<<SCptr
->target
) & esp
->targets_present
) &&
2864 SCptr
->device
->sync
&&
2865 SCptr
->device
->sync_max_offset
) {
2866 /* SCSI standard says that the synchronous capabilities
2867 * should be renegotiated at this point. Most likely
2868 * we are about to request sense from this target
2869 * in which case we want to avoid using sync
2870 * transfers until we are sure of the current target
2873 ESPMISC(("esp: Status <%d> for target %d lun %d\n",
2874 SCptr
->SCp
.Status
, SCptr
->target
, SCptr
->lun
));
2876 /* But don't do this when spinning up a disk at
2877 * boot time while we poll for completion as it
2878 * fills up the console with messages. Also, tapes
2879 * can report not ready many times right after
2880 * loading up a tape.
2882 if (esp_should_clear_sync(SCptr
) != 0)
2883 SCptr
->device
->sync
= 0;
2885 ESPDISC(("F<%02x,%02x>", SCptr
->target
, SCptr
->lun
));
2886 esp_done(esp
, ((SCptr
->SCp
.Status
& 0xff) |
2887 ((SCptr
->SCp
.Message
& 0xff)<<8) |
2889 } else if (esp
->prevmsgin
== DISCONNECT
) {
2890 /* Normal disconnect. */
2891 esp_cmd(esp
, ESP_CMD_ESEL
);
2892 ESPDISC(("D<%02x,%02x>", SCptr
->target
, SCptr
->lun
));
2893 append_SC(&esp
->disconnected_SC
, SCptr
);
2894 esp
->current_SC
= NULL
;
2898 /* Driver bug, we do not expect a disconnect here
2899 * and should not have advanced the state engine
2902 ESPLOG(("esp%d: last msg not disc and not cmd cmplt.\n",
2904 return do_reset_bus
;
2909 /* When a reselect occurs, and we cannot find the command to
2910 * reconnect to in our queues, we do this.
2912 static int esp_bad_reconnect(struct esp
*esp
)
2916 ESPLOG(("esp%d: Eieeee, reconnecting unknown command!\n",
2918 ESPLOG(("QUEUE DUMP\n"));
2920 ESPLOG(("esp%d: issue_SC[", esp
->esp_id
));
2922 ESPLOG(("<%02x,%02x>", sp
->target
, sp
->lun
));
2923 sp
= (Scsi_Cmnd
*) sp
->host_scribble
;
2926 sp
= esp
->current_SC
;
2927 ESPLOG(("esp%d: current_SC[", esp
->esp_id
));
2929 ESPLOG(("<%02x,%02x>", sp
->target
, sp
->lun
));
2933 sp
= esp
->disconnected_SC
;
2934 ESPLOG(("esp%d: disconnected_SC[", esp
->esp_id
));
2936 ESPLOG(("<%02x,%02x>", sp
->target
, sp
->lun
));
2937 sp
= (Scsi_Cmnd
*) sp
->host_scribble
;
2940 return do_reset_bus
;
2943 /* Do the needy when a target tries to reconnect to us. */
2944 static int esp_do_reconnect(struct esp
*esp
)
2949 /* Check for all bogus conditions first. */
2950 target
= reconnect_target(esp
);
2952 ESPDISC(("bad bus bits\n"));
2953 return do_reset_bus
;
2955 lun
= reconnect_lun(esp
);
2957 ESPDISC(("target=%2x, bad identify msg\n", target
));
2958 return do_reset_bus
;
2961 /* Things look ok... */
2962 ESPDISC(("R<%02x,%02x>", target
, lun
));
2964 /* Must not flush FIFO or DVMA on HME. */
2965 if (esp
->erev
!= fashme
) {
2966 esp_cmd(esp
, ESP_CMD_FLUSH
);
2967 if (esp100_reconnect_hwbug(esp
))
2968 return do_reset_bus
;
2969 esp_cmd(esp
, ESP_CMD_NULL
);
2972 SCptr
= remove_SC(&esp
->disconnected_SC
, (u8
) target
, (u8
) lun
);
2974 return esp_bad_reconnect(esp
);
2976 esp_connect(esp
, SCptr
);
2977 esp_cmd(esp
, ESP_CMD_MOK
);
2979 if (esp
->erev
== fashme
)
2980 sbus_writeb(((SCptr
->target
& 0xf) |
2981 (ESP_BUSID_RESELID
| ESP_BUSID_CTR32BIT
)),
2982 esp
->eregs
+ ESP_BUSID
);
2984 /* Reconnect implies a restore pointers operation. */
2985 esp_restore_pointers(esp
, SCptr
);
2988 esp_advance_phase(SCptr
, in_the_dark
);
2992 /* End of NEXUS (hopefully), pick up status + message byte then leave if
2995 static int esp_do_status(struct esp
*esp
)
2997 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
3000 rval
= skipahead1(esp
, SCptr
, in_the_dark
, in_status
);
3004 ESPSTAT(("esp_do_status: "));
3005 if (intr
!= ESP_INTR_DC
) {
3006 int message_out
= 0; /* for parity problems */
3008 /* Ack the message. */
3009 ESPSTAT(("ack msg, "));
3010 esp_cmd(esp
, ESP_CMD_MOK
);
3012 if (esp
->erev
!= fashme
) {
3013 dma_flashclear(esp
);
3015 /* Wait till the first bits settle. */
3016 while (esp
->esp_command
[0] == 0xff)
3019 esp
->esp_command
[0] = esp
->hme_fifo_workaround_buffer
[0];
3020 esp
->esp_command
[1] = esp
->hme_fifo_workaround_buffer
[1];
3023 ESPSTAT(("got something, "));
3024 /* ESP chimes in with one of
3026 * 1) function done interrupt:
3027 * both status and message in bytes
3030 * 2) bus service interrupt:
3031 * only status byte was acquired
3034 * can't happen, but we test for it
3037 * ALSO: If bad parity was detected on either
3038 * the status _or_ the message byte then
3039 * the ESP has asserted ATN on the bus
3040 * and we must therefore wait for the
3041 * next phase change.
3043 if (intr
& ESP_INTR_FDONE
) {
3044 /* We got it all, hallejulia. */
3045 ESPSTAT(("got both, "));
3046 SCptr
->SCp
.Status
= esp
->esp_command
[0];
3047 SCptr
->SCp
.Message
= esp
->esp_command
[1];
3048 esp
->prevmsgin
= SCptr
->SCp
.Message
;
3049 esp
->cur_msgin
[0] = SCptr
->SCp
.Message
;
3050 if (esp
->sreg
& ESP_STAT_PERR
) {
3051 /* There was bad parity for the
3052 * message byte, the status byte
3055 message_out
= MSG_PARITY_ERROR
;
3057 } else if (intr
== ESP_INTR_BSERV
) {
3058 /* Only got status byte. */
3059 ESPLOG(("esp%d: got status only, ", esp
->esp_id
));
3060 if (!(esp
->sreg
& ESP_STAT_PERR
)) {
3061 SCptr
->SCp
.Status
= esp
->esp_command
[0];
3062 SCptr
->SCp
.Message
= 0xff;
3064 /* The status byte had bad parity.
3065 * we leave the scsi_pointer Status
3066 * field alone as we set it to a default
3067 * of CHECK_CONDITION in esp_queue.
3069 message_out
= INITIATOR_ERROR
;
3072 /* This shouldn't happen ever. */
3073 ESPSTAT(("got bolixed\n"));
3074 esp_advance_phase(SCptr
, in_the_dark
);
3075 return esp_do_phase_determine(esp
);
3079 ESPSTAT(("status=%2x msg=%2x, ", SCptr
->SCp
.Status
,
3080 SCptr
->SCp
.Message
));
3081 if (SCptr
->SCp
.Message
== COMMAND_COMPLETE
) {
3082 ESPSTAT(("and was COMMAND_COMPLETE\n"));
3083 esp_advance_phase(SCptr
, in_freeing
);
3084 return esp_do_freebus(esp
);
3086 ESPLOG(("esp%d: and _not_ COMMAND_COMPLETE\n",
3088 esp
->msgin_len
= esp
->msgin_ctr
= 1;
3089 esp_advance_phase(SCptr
, in_msgindone
);
3090 return esp_do_msgindone(esp
);
3093 /* With luck we'll be able to let the target
3094 * know that bad parity happened, it will know
3095 * which byte caused the problems and send it
3096 * again. For the case where the status byte
3097 * receives bad parity, I do not believe most
3098 * targets recover very well. We'll see.
3100 ESPLOG(("esp%d: bad parity somewhere mout=%2x\n",
3101 esp
->esp_id
, message_out
));
3102 esp
->cur_msgout
[0] = message_out
;
3103 esp
->msgout_len
= esp
->msgout_ctr
= 1;
3104 esp_advance_phase(SCptr
, in_the_dark
);
3105 return esp_do_phase_determine(esp
);
3108 /* If we disconnect now, all hell breaks loose. */
3109 ESPLOG(("esp%d: whoops, disconnect\n", esp
->esp_id
));
3110 esp_advance_phase(SCptr
, in_the_dark
);
3111 return esp_do_phase_determine(esp
);
3115 static int esp_enter_status(struct esp
*esp
)
3117 u8 thecmd
= ESP_CMD_ICCSEQ
;
3119 esp_cmd(esp
, ESP_CMD_FLUSH
);
3120 if (esp
->erev
!= fashme
) {
3123 esp
->esp_command
[0] = esp
->esp_command
[1] = 0xff;
3124 sbus_writeb(2, esp
->eregs
+ ESP_TCLOW
);
3125 sbus_writeb(0, esp
->eregs
+ ESP_TCMED
);
3126 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
3127 tmp
|= (DMA_ST_WRITE
| DMA_ENABLE
);
3128 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
3129 if (esp
->dma
->revision
== dvmaesc1
)
3130 sbus_writel(0x100, esp
->dregs
+ DMA_COUNT
);
3131 sbus_writel(esp
->esp_command_dvma
, esp
->dregs
+ DMA_ADDR
);
3132 thecmd
|= ESP_CMD_DMA
;
3134 esp_cmd(esp
, thecmd
);
3135 esp_advance_phase(esp
->current_SC
, in_status
);
3137 return esp_do_status(esp
);
3140 static int esp_disconnect_amidst_phases(struct esp
*esp
)
3142 Scsi_Cmnd
*sp
= esp
->current_SC
;
3143 Scsi_Device
*dp
= sp
->device
;
3145 /* This means real problems if we see this
3146 * here. Unless we were actually trying
3147 * to force the device to abort/reset.
3149 ESPLOG(("esp%d Disconnect amidst phases, ", esp
->esp_id
));
3150 ESPLOG(("pphase<%s> cphase<%s>, ",
3151 phase_string(sp
->SCp
.phase
),
3152 phase_string(sp
->SCp
.sent_command
)));
3154 if (esp
->disconnected_SC
!= NULL
|| (esp
->erev
== fashme
))
3155 esp_cmd(esp
, ESP_CMD_ESEL
);
3157 switch (esp
->cur_msgout
[0]) {
3159 /* We didn't expect this to happen at all. */
3160 ESPLOG(("device is bolixed\n"));
3161 esp_advance_phase(sp
, in_tgterror
);
3162 esp_done(esp
, (DID_ERROR
<< 16));
3165 case BUS_DEVICE_RESET
:
3166 ESPLOG(("device reset successful\n"));
3167 dp
->sync_max_offset
= 0;
3168 dp
->sync_min_period
= 0;
3170 esp_advance_phase(sp
, in_resetdev
);
3171 esp_done(esp
, (DID_RESET
<< 16));
3175 ESPLOG(("device abort successful\n"));
3176 esp_advance_phase(sp
, in_abortone
);
3177 esp_done(esp
, (DID_ABORT
<< 16));
3184 static int esp_enter_msgout(struct esp
*esp
)
3186 esp_advance_phase(esp
->current_SC
, in_msgout
);
3187 return esp_do_msgout(esp
);
3190 static int esp_enter_msgin(struct esp
*esp
)
3192 esp_advance_phase(esp
->current_SC
, in_msgin
);
3193 return esp_do_msgin(esp
);
3196 static int esp_enter_cmd(struct esp
*esp
)
3198 esp_advance_phase(esp
->current_SC
, in_cmdbegin
);
3199 return esp_do_cmdbegin(esp
);
3202 static int esp_enter_badphase(struct esp
*esp
)
3204 ESPLOG(("esp%d: Bizarre bus phase %2x.\n", esp
->esp_id
,
3205 esp
->sreg
& ESP_STAT_PMASK
));
3206 return do_reset_bus
;
3209 typedef int (*espfunc_t
)(struct esp
*);
3211 static espfunc_t phase_vector
[] = {
3212 esp_do_data
, /* ESP_DOP */
3213 esp_do_data
, /* ESP_DIP */
3214 esp_enter_cmd
, /* ESP_CMDP */
3215 esp_enter_status
, /* ESP_STATP */
3216 esp_enter_badphase
, /* ESP_STAT_PMSG */
3217 esp_enter_badphase
, /* ESP_STAT_PMSG | ESP_STAT_PIO */
3218 esp_enter_msgout
, /* ESP_MOP */
3219 esp_enter_msgin
, /* ESP_MIP */
3222 /* The target has control of the bus and we have to see where it has
3225 static int esp_do_phase_determine(struct esp
*esp
)
3227 if ((esp
->ireg
& ESP_INTR_DC
) != 0)
3228 return esp_disconnect_amidst_phases(esp
);
3229 return phase_vector
[esp
->sreg
& ESP_STAT_PMASK
](esp
);
3232 /* First interrupt after exec'ing a cmd comes here. */
3233 static int esp_select_complete(struct esp
*esp
)
3235 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
3236 Scsi_Device
*SDptr
= SCptr
->device
;
3237 int cmd_bytes_sent
, fcnt
;
3239 if (esp
->erev
!= fashme
)
3240 esp
->seqreg
= (sbus_readb(esp
->eregs
+ ESP_SSTEP
) & ESP_STEP_VBITS
);
3242 if (esp
->erev
== fashme
)
3243 fcnt
= esp
->hme_fifo_workaround_count
;
3245 fcnt
= (sbus_readb(esp
->eregs
+ ESP_FFLAGS
) & ESP_FF_FBYTES
);
3247 cmd_bytes_sent
= esp_bytes_sent(esp
, fcnt
);
3248 dma_invalidate(esp
);
3250 /* Let's check to see if a reselect happened
3251 * while we we're trying to select. This must
3254 if (esp
->ireg
== (ESP_INTR_RSEL
| ESP_INTR_FDONE
)) {
3255 esp_reconnect(esp
, SCptr
);
3256 return esp_do_reconnect(esp
);
3259 /* Looks like things worked, we should see a bus service &
3260 * a function complete interrupt at this point. Note we
3261 * are doing a direct comparison because we don't want to
3262 * be fooled into thinking selection was successful if
3263 * ESP_INTR_DC is set, see below.
3265 if (esp
->ireg
== (ESP_INTR_FDONE
| ESP_INTR_BSERV
)) {
3266 /* target speaks... */
3267 esp
->targets_present
|= (1<<SCptr
->target
);
3269 /* What if the target ignores the sdtr? */
3273 /* See how far, if at all, we got in getting
3274 * the information out to the target.
3276 switch (esp
->seqreg
) {
3280 /* Arbitration won, target selected, but
3281 * we are in some phase which is not command
3282 * phase nor is it message out phase.
3284 * XXX We've confused the target, obviously.
3285 * XXX So clear it's state, but we also end
3286 * XXX up clearing everyone elses. That isn't
3287 * XXX so nice. I'd like to just reset this
3288 * XXX target, but if I cannot even get it's
3289 * XXX attention and finish selection to talk
3290 * XXX to it, there is not much more I can do.
3291 * XXX If we have a loaded bus we're going to
3292 * XXX spend the next second or so renegotiating
3293 * XXX for synchronous transfers.
3295 ESPLOG(("esp%d: STEP_ASEL for tgt %d\n",
3296 esp
->esp_id
, SCptr
->target
));
3299 /* Arbitration won, target selected, went
3300 * to message out phase, sent one message
3301 * byte, then we stopped. ATN is asserted
3302 * on the SCSI bus and the target is still
3303 * there hanging on. This is a legal
3304 * sequence step if we gave the ESP a select
3307 * XXX See above, I could set the borken flag
3308 * XXX in the device struct and retry the
3309 * XXX command. But would that help for
3310 * XXX tagged capable targets?
3314 /* Arbitration won, target selected, maybe
3315 * sent the one message byte in message out
3316 * phase, but we did not go to command phase
3317 * in the end. Actually, we could have sent
3318 * only some of the message bytes if we tried
3319 * to send out the entire identify and tag
3320 * message using ESP_CMD_SA3.
3326 /* No, not the powerPC pinhead. Arbitration
3327 * won, all message bytes sent if we went to
3328 * message out phase, went to command phase
3329 * but only part of the command was sent.
3331 * XXX I've seen this, but usually in conjunction
3332 * XXX with a gross error which appears to have
3333 * XXX occurred between the time I told the
3334 * XXX ESP to arbitrate and when I got the
3335 * XXX interrupt. Could I have misloaded the
3336 * XXX command bytes into the fifo? Actually,
3337 * XXX I most likely missed a phase, and therefore
3338 * XXX went into never never land and didn't even
3339 * XXX know it. That was the old driver though.
3340 * XXX What is even more peculiar is that the ESP
3341 * XXX showed the proper function complete and
3342 * XXX bus service bits in the interrupt register.
3345 case ESP_STEP_FINI4
:
3346 case ESP_STEP_FINI5
:
3347 case ESP_STEP_FINI6
:
3348 case ESP_STEP_FINI7
:
3349 /* Account for the identify message */
3350 if (SCptr
->SCp
.phase
== in_slct_norm
)
3351 cmd_bytes_sent
-= 1;
3354 if (esp
->erev
!= fashme
)
3355 esp_cmd(esp
, ESP_CMD_NULL
);
3357 /* Be careful, we could really get fucked during synchronous
3358 * data transfers if we try to flush the fifo now.
3360 if ((esp
->erev
!= fashme
) && /* not a Happy Meal and... */
3361 !fcnt
&& /* Fifo is empty and... */
3362 /* either we are not doing synchronous transfers or... */
3363 (!SDptr
->sync_max_offset
||
3364 /* We are not going into data in phase. */
3365 ((esp
->sreg
& ESP_STAT_PMASK
) != ESP_DIP
)))
3366 esp_cmd(esp
, ESP_CMD_FLUSH
); /* flush is safe */
3368 /* See how far we got if this is not a slow command. */
3369 if (!esp
->esp_slowcmd
) {
3370 if (cmd_bytes_sent
< 0)
3372 if (cmd_bytes_sent
!= SCptr
->cmd_len
) {
3373 /* Crapola, mark it as a slowcmd
3374 * so that we have some chance of
3375 * keeping the command alive with
3378 * XXX Actually, if we didn't send it all
3379 * XXX this means either we didn't set things
3380 * XXX up properly (driver bug) or the target
3381 * XXX or the ESP detected parity on one of
3382 * XXX the command bytes. This makes much
3383 * XXX more sense, and therefore this code
3384 * XXX should be changed to send out a
3385 * XXX parity error message or if the status
3386 * XXX register shows no parity error then
3387 * XXX just expect the target to bring the
3388 * XXX bus into message in phase so that it
3389 * XXX can send us the parity error message.
3392 esp
->esp_slowcmd
= 1;
3393 esp
->esp_scmdp
= &(SCptr
->cmnd
[cmd_bytes_sent
]);
3394 esp
->esp_scmdleft
= (SCptr
->cmd_len
- cmd_bytes_sent
);
3398 /* Now figure out where we went. */
3399 esp_advance_phase(SCptr
, in_the_dark
);
3400 return esp_do_phase_determine(esp
);
3403 /* Did the target even make it? */
3404 if (esp
->ireg
== ESP_INTR_DC
) {
3405 /* wheee... nobody there or they didn't like
3406 * what we told it to do, clean up.
3409 /* If anyone is off the bus, but working on
3410 * a command in the background for us, tell
3411 * the ESP to listen for them.
3413 if (esp
->disconnected_SC
)
3414 esp_cmd(esp
, ESP_CMD_ESEL
);
3416 if (((1<<SCptr
->target
) & esp
->targets_present
) &&
3418 (esp
->cur_msgout
[0] == EXTENDED_MESSAGE
) &&
3419 (SCptr
->SCp
.phase
== in_slct_msg
||
3420 SCptr
->SCp
.phase
== in_slct_stop
)) {
3423 ESPLOG(("esp%d: Failed synchronous negotiation for target %d "
3424 "lun %d\n", esp
->esp_id
, SCptr
->target
, SCptr
->lun
));
3425 SDptr
->sync_max_offset
= 0;
3426 SDptr
->sync_min_period
= 0;
3427 SDptr
->sync
= 1; /* so we don't negotiate again */
3429 /* Run the command again, this time though we
3430 * won't try to negotiate for synchronous transfers.
3432 * XXX I'd like to do something like send an
3433 * XXX INITIATOR_ERROR or ABORT message to the
3434 * XXX target to tell it, "Sorry I confused you,
3435 * XXX please come back and I will be nicer next
3436 * XXX time". But that requires having the target
3437 * XXX on the bus, and it has dropped BSY on us.
3439 esp
->current_SC
= NULL
;
3440 esp_advance_phase(SCptr
, not_issued
);
3441 prepend_SC(&esp
->issue_SC
, SCptr
);
3446 /* Ok, this is normal, this is what we see during boot
3447 * or whenever when we are scanning the bus for targets.
3448 * But first make sure that is really what is happening.
3450 if (((1<<SCptr
->target
) & esp
->targets_present
)) {
3451 ESPLOG(("esp%d: Warning, live target %d not responding to "
3452 "selection.\n", esp
->esp_id
, SCptr
->target
));
3454 /* This _CAN_ happen. The SCSI standard states that
3455 * the target is to _not_ respond to selection if
3456 * _it_ detects bad parity on the bus for any reason.
3457 * Therefore, we assume that if we've talked successfully
3458 * to this target before, bad parity is the problem.
3460 esp_done(esp
, (DID_PARITY
<< 16));
3462 /* Else, there really isn't anyone there. */
3463 ESPMISC(("esp: selection failure, maybe nobody there?\n"));
3464 ESPMISC(("esp: target %d lun %d\n",
3465 SCptr
->target
, SCptr
->lun
));
3466 esp_done(esp
, (DID_BAD_TARGET
<< 16));
3471 ESPLOG(("esp%d: Selection failure.\n", esp
->esp_id
));
3472 printk("esp%d: Currently -- ", esp
->esp_id
);
3473 esp_print_ireg(esp
->ireg
); printk(" ");
3474 esp_print_statreg(esp
->sreg
); printk(" ");
3475 esp_print_seqreg(esp
->seqreg
); printk("\n");
3476 printk("esp%d: New -- ", esp
->esp_id
);
3477 esp
->sreg
= sbus_readb(esp
->eregs
+ ESP_STATUS
);
3478 esp
->seqreg
= sbus_readb(esp
->eregs
+ ESP_SSTEP
);
3479 esp
->ireg
= sbus_readb(esp
->eregs
+ ESP_INTRPT
);
3480 esp_print_ireg(esp
->ireg
); printk(" ");
3481 esp_print_statreg(esp
->sreg
); printk(" ");
3482 esp_print_seqreg(esp
->seqreg
); printk("\n");
3483 ESPLOG(("esp%d: resetting bus\n", esp
->esp_id
));
3484 return do_reset_bus
; /* ugh... */
3487 /* Continue reading bytes for msgin phase. */
3488 static int esp_do_msgincont(struct esp
*esp
)
3490 if (esp
->ireg
& ESP_INTR_BSERV
) {
3491 /* in the right phase too? */
3492 if ((esp
->sreg
& ESP_STAT_PMASK
) == ESP_MIP
) {
3494 esp_cmd(esp
, ESP_CMD_TI
);
3495 esp_advance_phase(esp
->current_SC
, in_msgindone
);
3499 /* We changed phase but ESP shows bus service,
3500 * in this case it is most likely that we, the
3501 * hacker who has been up for 20hrs straight
3502 * staring at the screen, drowned in coffee
3503 * smelling like retched cigarette ashes
3504 * have miscoded something..... so, try to
3505 * recover as best we can.
3507 ESPLOG(("esp%d: message in mis-carriage.\n", esp
->esp_id
));
3509 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3510 return do_phase_determine
;
3513 static int check_singlebyte_msg(struct esp
*esp
)
3515 esp
->prevmsgin
= esp
->cur_msgin
[0];
3516 if (esp
->cur_msgin
[0] & 0x80) {
3518 ESPLOG(("esp%d: target sends identify amidst phases\n",
3520 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3522 } else if (((esp
->cur_msgin
[0] & 0xf0) == 0x20) ||
3523 (esp
->cur_msgin
[0] == EXTENDED_MESSAGE
)) {
3525 esp_advance_phase(esp
->current_SC
, in_msgincont
);
3528 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3529 switch (esp
->cur_msgin
[0]) {
3531 /* We don't want to hear about it. */
3532 ESPLOG(("esp%d: msg %02x which we don't know about\n", esp
->esp_id
,
3533 esp
->cur_msgin
[0]));
3534 return MESSAGE_REJECT
;
3537 ESPLOG(("esp%d: target %d sends a nop\n", esp
->esp_id
,
3538 esp
->current_SC
->target
));
3541 case RESTORE_POINTERS
:
3542 /* In this case we might also have to backup the
3543 * "slow command" pointer. It is rare to get such
3544 * a save/restore pointer sequence so early in the
3545 * bus transition sequences, but cover it.
3547 if (esp
->esp_slowcmd
) {
3548 esp
->esp_scmdleft
= esp
->current_SC
->cmd_len
;
3549 esp
->esp_scmdp
= &esp
->current_SC
->cmnd
[0];
3551 esp_restore_pointers(esp
, esp
->current_SC
);
3555 esp_save_pointers(esp
, esp
->current_SC
);
3558 case COMMAND_COMPLETE
:
3560 /* Freeing the bus, let it go. */
3561 esp
->current_SC
->SCp
.phase
= in_freeing
;
3564 case MESSAGE_REJECT
:
3565 ESPMISC(("msg reject, "));
3566 if (esp
->prevmsgout
== EXTENDED_MESSAGE
) {
3567 Scsi_Device
*SDptr
= esp
->current_SC
->device
;
3569 /* Doesn't look like this target can
3570 * do synchronous or WIDE transfers.
3572 ESPSDTR(("got reject, was trying nego, clearing sync/WIDE\n"));
3575 SDptr
->sync_min_period
= 0;
3576 SDptr
->sync_max_offset
= 0;
3579 ESPMISC(("not sync nego, sending ABORT\n"));
3585 /* Target negotiates for synchronous transfers before we do, this
3586 * is legal although very strange. What is even funnier is that
3587 * the SCSI2 standard specifically recommends against targets doing
3588 * this because so many initiators cannot cope with this occuring.
3590 static int target_with_ants_in_pants(struct esp
*esp
,
3594 if (SDptr
->sync
|| SDptr
->borken
) {
3595 /* sorry, no can do */
3596 ESPSDTR(("forcing to async, "));
3597 build_sync_nego_msg(esp
, 0, 0);
3600 ESPLOG(("esp%d: hoping for msgout\n", esp
->esp_id
));
3601 esp_advance_phase(SCptr
, in_the_dark
);
3602 return EXTENDED_MESSAGE
;
3605 /* Ok, we'll check them out... */
3609 static void sync_report(struct esp
*esp
)
3614 msg3
= esp
->cur_msgin
[3];
3615 msg4
= esp
->cur_msgin
[4];
3617 int hz
= 1000000000 / (msg3
* 4);
3618 int integer
= hz
/ 1000000;
3619 int fraction
= (hz
- (integer
* 1000000)) / 10000;
3620 if ((esp
->erev
== fashme
) &&
3621 (esp
->config3
[esp
->current_SC
->target
] & ESP_CONFIG3_EWIDE
)) {
3625 } else if ((msg3
* 4) < 200) {
3628 type
= "synchronous";
3631 /* Do not transform this back into one big printk
3632 * again, it triggers a bug in our sparc64-gcc272
3633 * sibling call optimization. -DaveM
3635 ESPLOG((KERN_INFO
"esp%d: target %d ",
3636 esp
->esp_id
, esp
->current_SC
->target
));
3637 ESPLOG(("[period %dns offset %d %d.%02dMHz ",
3638 (int) msg3
* 4, (int) msg4
,
3639 integer
, fraction
));
3640 ESPLOG(("%s SCSI%s]\n", type
,
3641 (((msg3
* 4) < 200) ? "-II" : "")));
3643 ESPLOG((KERN_INFO
"esp%d: target %d asynchronous\n",
3644 esp
->esp_id
, esp
->current_SC
->target
));
3648 static int check_multibyte_msg(struct esp
*esp
)
3650 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
3651 Scsi_Device
*SDptr
= SCptr
->device
;
3653 int message_out
= 0;
3655 ESPSDTR(("chk multibyte msg: "));
3656 if (esp
->cur_msgin
[2] == EXTENDED_SDTR
) {
3657 int period
= esp
->cur_msgin
[3];
3658 int offset
= esp
->cur_msgin
[4];
3660 ESPSDTR(("is sync nego response, "));
3664 /* Target negotiates first! */
3665 ESPSDTR(("target jumps the gun, "));
3666 message_out
= EXTENDED_MESSAGE
; /* we must respond */
3667 rval
= target_with_ants_in_pants(esp
, SCptr
, SDptr
);
3672 ESPSDTR(("examining sdtr, "));
3674 /* Offset cannot be larger than ESP fifo size. */
3676 ESPSDTR(("offset too big %2x, ", offset
));
3678 ESPSDTR(("sending back new offset\n"));
3679 build_sync_nego_msg(esp
, period
, offset
);
3680 return EXTENDED_MESSAGE
;
3683 if (offset
&& period
> esp
->max_period
) {
3684 /* Yeee, async for this slow device. */
3685 ESPSDTR(("period too long %2x, ", period
));
3686 build_sync_nego_msg(esp
, 0, 0);
3687 ESPSDTR(("hoping for msgout\n"));
3688 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3689 return EXTENDED_MESSAGE
;
3690 } else if (offset
&& period
< esp
->min_period
) {
3691 ESPSDTR(("period too short %2x, ", period
));
3692 period
= esp
->min_period
;
3693 if (esp
->erev
> esp236
)
3697 } else if (offset
) {
3700 ESPSDTR(("period is ok, "));
3701 tmp
= esp
->ccycle
/ 1000;
3702 regval
= (((period
<< 2) + tmp
- 1) / tmp
);
3703 if (regval
&& ((esp
->erev
== fas100a
||
3704 esp
->erev
== fas236
||
3705 esp
->erev
== fashme
))) {
3714 SDptr
->sync_min_period
= (regval
& 0x1f);
3715 SDptr
->sync_max_offset
= (offset
| esp
->radelay
);
3716 if (esp
->erev
== fas100a
|| esp
->erev
== fas236
|| esp
->erev
== fashme
) {
3717 if ((esp
->erev
== fas100a
) || (esp
->erev
== fashme
))
3718 bit
= ESP_CONFIG3_FAST
;
3720 bit
= ESP_CONFIG3_FSCSI
;
3722 /* On FAS366, if using fast-20 synchronous transfers
3723 * we need to make sure the REQ/ACK assert/deassert
3724 * control bits are clear.
3726 if (esp
->erev
== fashme
)
3727 SDptr
->sync_max_offset
&= ~esp
->radelay
;
3728 esp
->config3
[SCptr
->target
] |= bit
;
3730 esp
->config3
[SCptr
->target
] &= ~bit
;
3732 esp
->prev_cfg3
= esp
->config3
[SCptr
->target
];
3733 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
3735 esp
->prev_soff
= SDptr
->sync_max_offset
;
3736 esp
->prev_stp
= SDptr
->sync_min_period
;
3737 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
3738 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
3739 ESPSDTR(("soff=%2x stp=%2x cfg3=%2x\n",
3740 SDptr
->sync_max_offset
,
3741 SDptr
->sync_min_period
,
3742 esp
->config3
[SCptr
->target
]));
3745 } else if (SDptr
->sync_max_offset
) {
3748 /* back to async mode */
3749 ESPSDTR(("unaccaptable sync nego, forcing async\n"));
3750 SDptr
->sync_max_offset
= 0;
3751 SDptr
->sync_min_period
= 0;
3754 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
3755 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
3756 if (esp
->erev
== fas100a
|| esp
->erev
== fas236
|| esp
->erev
== fashme
) {
3757 if ((esp
->erev
== fas100a
) || (esp
->erev
== fashme
))
3758 bit
= ESP_CONFIG3_FAST
;
3760 bit
= ESP_CONFIG3_FSCSI
;
3761 esp
->config3
[SCptr
->target
] &= ~bit
;
3762 esp
->prev_cfg3
= esp
->config3
[SCptr
->target
];
3763 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
3769 ESPSDTR(("chk multibyte msg: sync is known, "));
3773 ESPLOG(("esp%d: sending sdtr back, hoping for msgout\n",
3775 build_sync_nego_msg(esp
, period
, offset
);
3776 esp_advance_phase(SCptr
, in_the_dark
);
3777 return EXTENDED_MESSAGE
;
3780 ESPSDTR(("returning zero\n"));
3781 esp_advance_phase(SCptr
, in_the_dark
); /* ...or else! */
3783 } else if (esp
->cur_msgin
[2] == EXTENDED_WDTR
) {
3784 int size
= 8 << esp
->cur_msgin
[3];
3787 if (esp
->erev
!= fashme
) {
3788 ESPLOG(("esp%d: AIEEE wide msg received and not HME.\n",
3790 message_out
= MESSAGE_REJECT
;
3791 } else if (size
> 16) {
3792 ESPLOG(("esp%d: AIEEE wide transfer for %d size "
3793 "not supported.\n", esp
->esp_id
, size
));
3794 message_out
= MESSAGE_REJECT
;
3796 /* Things look good; let's see what we got. */
3798 /* Set config 3 register for this target. */
3799 esp
->config3
[SCptr
->target
] |= ESP_CONFIG3_EWIDE
;
3801 /* Just make sure it was one byte sized. */
3803 ESPLOG(("esp%d: Aieee, wide nego of %d size.\n",
3804 esp
->esp_id
, size
));
3805 message_out
= MESSAGE_REJECT
;
3808 /* Pure paranoia. */
3809 esp
->config3
[SCptr
->target
] &= ~(ESP_CONFIG3_EWIDE
);
3811 esp
->prev_cfg3
= esp
->config3
[SCptr
->target
];
3812 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
3814 /* Regardless, next try for sync transfers. */
3815 build_sync_nego_msg(esp
, esp
->sync_defp
, 15);
3818 message_out
= EXTENDED_MESSAGE
;
3820 } else if (esp
->cur_msgin
[2] == EXTENDED_MODIFY_DATA_POINTER
) {
3821 ESPLOG(("esp%d: rejecting modify data ptr msg\n", esp
->esp_id
));
3822 message_out
= MESSAGE_REJECT
;
3825 esp_advance_phase(SCptr
, in_the_dark
);
3829 static int esp_do_msgindone(struct esp
*esp
)
3831 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
3832 int message_out
= 0, it
= 0, rval
;
3834 rval
= skipahead1(esp
, SCptr
, in_msgin
, in_msgindone
);
3837 if (SCptr
->SCp
.sent_command
!= in_status
) {
3838 if (!(esp
->ireg
& ESP_INTR_DC
)) {
3839 if (esp
->msgin_len
&& (esp
->sreg
& ESP_STAT_PERR
)) {
3840 message_out
= MSG_PARITY_ERROR
;
3841 esp_cmd(esp
, ESP_CMD_FLUSH
);
3842 } else if (esp
->erev
!= fashme
&&
3843 (it
= (sbus_readb(esp
->eregs
+ ESP_FFLAGS
) & ESP_FF_FBYTES
)) != 1) {
3844 /* We certainly dropped the ball somewhere. */
3845 message_out
= INITIATOR_ERROR
;
3846 esp_cmd(esp
, ESP_CMD_FLUSH
);
3847 } else if (!esp
->msgin_len
) {
3848 if (esp
->erev
== fashme
)
3849 it
= esp
->hme_fifo_workaround_buffer
[0];
3851 it
= sbus_readb(esp
->eregs
+ ESP_FDATA
);
3852 esp_advance_phase(SCptr
, in_msgincont
);
3854 /* it is ok and we want it */
3855 if (esp
->erev
== fashme
)
3856 it
= esp
->cur_msgin
[esp
->msgin_ctr
] =
3857 esp
->hme_fifo_workaround_buffer
[0];
3859 it
= esp
->cur_msgin
[esp
->msgin_ctr
] =
3860 sbus_readb(esp
->eregs
+ ESP_FDATA
);
3864 esp_advance_phase(SCptr
, in_the_dark
);
3868 it
= esp
->cur_msgin
[0];
3870 if (!message_out
&& esp
->msgin_len
) {
3871 if (esp
->msgin_ctr
< esp
->msgin_len
) {
3872 esp_advance_phase(SCptr
, in_msgincont
);
3873 } else if (esp
->msgin_len
== 1) {
3874 message_out
= check_singlebyte_msg(esp
);
3875 } else if (esp
->msgin_len
== 2) {
3876 if (esp
->cur_msgin
[0] == EXTENDED_MESSAGE
) {
3877 if ((it
+ 2) >= 15) {
3878 message_out
= MESSAGE_REJECT
;
3880 esp
->msgin_len
= (it
+ 2);
3881 esp_advance_phase(SCptr
, in_msgincont
);
3884 message_out
= MESSAGE_REJECT
; /* foo on you */
3887 message_out
= check_multibyte_msg(esp
);
3890 if (message_out
< 0) {
3891 return -message_out
;
3892 } else if (message_out
) {
3893 if (((message_out
!= 1) &&
3894 ((message_out
< 0x20) || (message_out
& 0x80))))
3895 esp
->msgout_len
= 1;
3896 esp
->cur_msgout
[0] = message_out
;
3897 esp_cmd(esp
, ESP_CMD_SATN
);
3898 esp_advance_phase(SCptr
, in_the_dark
);
3901 esp
->sreg
= sbus_readb(esp
->eregs
+ ESP_STATUS
);
3902 esp
->sreg
&= ~(ESP_STAT_INTR
);
3903 if ((esp
->sreg
& (ESP_STAT_PMSG
|ESP_STAT_PCD
)) == (ESP_STAT_PMSG
|ESP_STAT_PCD
))
3904 esp_cmd(esp
, ESP_CMD_MOK
);
3905 if ((SCptr
->SCp
.sent_command
== in_msgindone
) &&
3906 (SCptr
->SCp
.phase
== in_freeing
))
3907 return esp_do_freebus(esp
);
3911 static int esp_do_cmdbegin(struct esp
*esp
)
3913 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
3915 esp_advance_phase(SCptr
, in_cmdend
);
3916 if (esp
->erev
== fashme
) {
3917 u32 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
3920 for (i
= 0; i
< esp
->esp_scmdleft
; i
++)
3921 esp
->esp_command
[i
] = *esp
->esp_scmdp
++;
3922 esp
->esp_scmdleft
= 0;
3923 esp_cmd(esp
, ESP_CMD_FLUSH
);
3924 esp_setcount(esp
->eregs
, i
, 1);
3925 esp_cmd(esp
, (ESP_CMD_DMA
| ESP_CMD_TI
));
3926 tmp
|= (DMA_SCSI_DISAB
| DMA_ENABLE
);
3927 tmp
&= ~(DMA_ST_WRITE
);
3928 sbus_writel(i
, esp
->dregs
+ DMA_COUNT
);
3929 sbus_writel(esp
->esp_command_dvma
, esp
->dregs
+ DMA_ADDR
);
3930 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
3934 esp_cmd(esp
, ESP_CMD_FLUSH
);
3935 tmp
= *esp
->esp_scmdp
++;
3936 esp
->esp_scmdleft
--;
3937 sbus_writeb(tmp
, esp
->eregs
+ ESP_FDATA
);
3938 esp_cmd(esp
, ESP_CMD_TI
);
3943 static int esp_do_cmddone(struct esp
*esp
)
3945 if (esp
->erev
== fashme
)
3946 dma_invalidate(esp
);
3948 esp_cmd(esp
, ESP_CMD_NULL
);
3950 if (esp
->ireg
& ESP_INTR_BSERV
) {
3951 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3952 return esp_do_phase_determine(esp
);
3955 ESPLOG(("esp%d: in do_cmddone() but didn't get BSERV interrupt.\n",
3957 return do_reset_bus
;
3960 static int esp_do_msgout(struct esp
*esp
)
3962 esp_cmd(esp
, ESP_CMD_FLUSH
);
3963 switch (esp
->msgout_len
) {
3965 if (esp
->erev
== fashme
)
3966 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 1);
3968 sbus_writeb(esp
->cur_msgout
[0], esp
->eregs
+ ESP_FDATA
);
3970 esp_cmd(esp
, ESP_CMD_TI
);
3974 esp
->esp_command
[0] = esp
->cur_msgout
[0];
3975 esp
->esp_command
[1] = esp
->cur_msgout
[1];
3977 if (esp
->erev
== fashme
) {
3978 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 2);
3979 esp_cmd(esp
, ESP_CMD_TI
);
3981 dma_setup(esp
, esp
->esp_command_dvma
, 2, 0);
3982 esp_setcount(esp
->eregs
, 2, 0);
3983 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
3988 esp
->esp_command
[0] = esp
->cur_msgout
[0];
3989 esp
->esp_command
[1] = esp
->cur_msgout
[1];
3990 esp
->esp_command
[2] = esp
->cur_msgout
[2];
3991 esp
->esp_command
[3] = esp
->cur_msgout
[3];
3994 if (esp
->erev
== fashme
) {
3995 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 4);
3996 esp_cmd(esp
, ESP_CMD_TI
);
3998 dma_setup(esp
, esp
->esp_command_dvma
, 4, 0);
3999 esp_setcount(esp
->eregs
, 4, 0);
4000 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
4005 esp
->esp_command
[0] = esp
->cur_msgout
[0];
4006 esp
->esp_command
[1] = esp
->cur_msgout
[1];
4007 esp
->esp_command
[2] = esp
->cur_msgout
[2];
4008 esp
->esp_command
[3] = esp
->cur_msgout
[3];
4009 esp
->esp_command
[4] = esp
->cur_msgout
[4];
4012 if (esp
->erev
== fashme
) {
4013 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 5);
4014 esp_cmd(esp
, ESP_CMD_TI
);
4016 dma_setup(esp
, esp
->esp_command_dvma
, 5, 0);
4017 esp_setcount(esp
->eregs
, 5, 0);
4018 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
4024 ESPMISC(("bogus msgout sending NOP\n"));
4025 esp
->cur_msgout
[0] = NOP
;
4027 if (esp
->erev
== fashme
) {
4028 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 1);
4030 sbus_writeb(esp
->cur_msgout
[0], esp
->eregs
+ ESP_FDATA
);
4033 esp
->msgout_len
= 1;
4034 esp_cmd(esp
, ESP_CMD_TI
);
4038 esp_advance_phase(esp
->current_SC
, in_msgoutdone
);
4042 static int esp_do_msgoutdone(struct esp
*esp
)
4044 if (esp
->msgout_len
> 1) {
4045 /* XXX HME/FAS ATN deassert workaround required,
4046 * XXX no DMA flushing, only possible ESP_CMD_FLUSH
4047 * XXX to kill the fifo.
4049 if (esp
->erev
!= fashme
) {
4052 while ((tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
)) & DMA_PEND_READ
)
4055 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
4056 dma_invalidate(esp
);
4058 esp_cmd(esp
, ESP_CMD_FLUSH
);
4061 if (!(esp
->ireg
& ESP_INTR_DC
)) {
4062 if (esp
->erev
!= fashme
)
4063 esp_cmd(esp
, ESP_CMD_NULL
);
4064 switch (esp
->sreg
& ESP_STAT_PMASK
) {
4066 /* whoops, parity error */
4067 ESPLOG(("esp%d: still in msgout, parity error assumed\n",
4069 if (esp
->msgout_len
> 1)
4070 esp_cmd(esp
, ESP_CMD_SATN
);
4071 esp_advance_phase(esp
->current_SC
, in_msgout
);
4078 /* Happy Meal fifo is touchy... */
4079 if ((esp
->erev
!= fashme
) &&
4081 !(esp
->current_SC
->device
->sync_max_offset
))
4082 esp_cmd(esp
, ESP_CMD_FLUSH
);
4087 ESPLOG(("esp%d: disconnect, resetting bus\n", esp
->esp_id
));
4088 return do_reset_bus
;
4091 /* If we sent out a synchronous negotiation message, update
4094 if (esp
->cur_msgout
[2] == EXTENDED_MESSAGE
&&
4095 esp
->cur_msgout
[4] == EXTENDED_SDTR
) {
4096 esp
->snip
= 1; /* anal retentiveness... */
4099 esp
->prevmsgout
= esp
->cur_msgout
[0];
4100 esp
->msgout_len
= 0;
4101 esp_advance_phase(esp
->current_SC
, in_the_dark
);
4102 return esp_do_phase_determine(esp
);
4105 static int esp_bus_unexpected(struct esp
*esp
)
4107 ESPLOG(("esp%d: command in weird state %2x\n",
4108 esp
->esp_id
, esp
->current_SC
->SCp
.phase
));
4109 return do_reset_bus
;
4112 static espfunc_t bus_vector
[] = {
4125 esp_do_phase_determine
,
4131 /* This is the second tier in our dual-level SCSI state machine. */
4132 static int esp_work_bus(struct esp
*esp
)
4134 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
4137 ESPBUS(("esp_work_bus: "));
4139 ESPBUS(("reconnect\n"));
4140 return esp_do_reconnect(esp
);
4142 phase
= SCptr
->SCp
.phase
;
4143 if ((phase
& 0xf0) == in_phases_mask
)
4144 return bus_vector
[(phase
& 0x0f)](esp
);
4145 else if ((phase
& 0xf0) == in_slct_mask
)
4146 return esp_select_complete(esp
);
4148 return esp_bus_unexpected(esp
);
4151 static espfunc_t isvc_vector
[] = {
4153 esp_do_phase_determine
,
4159 /* Main interrupt handler for an esp adapter. */
4160 static void esp_handle(struct esp
*esp
)
4163 int what_next
= do_intr_end
;
4165 SCptr
= esp
->current_SC
;
4167 /* Check for errors. */
4168 esp
->sreg
= sbus_readb(esp
->eregs
+ ESP_STATUS
);
4169 esp
->sreg
&= (~ESP_STAT_INTR
);
4170 if (esp
->erev
== fashme
) {
4171 esp
->sreg2
= sbus_readb(esp
->eregs
+ ESP_STATUS2
);
4172 esp
->seqreg
= (sbus_readb(esp
->eregs
+ ESP_SSTEP
) & ESP_STEP_VBITS
);
4175 if (esp
->sreg
& (ESP_STAT_SPAM
)) {
4176 /* Gross error, could be due to one of:
4178 * - top of fifo overwritten, could be because
4179 * we tried to do a synchronous transfer with
4180 * an offset greater than ESP fifo size
4182 * - top of command register overwritten
4184 * - DMA setup to go in one direction, SCSI
4185 * bus points in the other, whoops
4187 * - weird phase change during asynchronous
4188 * data phase while we are initiator
4190 ESPLOG(("esp%d: Gross error sreg=%2x\n", esp
->esp_id
, esp
->sreg
));
4192 /* If a command is live on the bus we cannot safely
4193 * reset the bus, so we'll just let the pieces fall
4194 * where they may. Here we are hoping that the
4195 * target will be able to cleanly go away soon
4196 * so we can safely reset things.
4199 ESPLOG(("esp%d: No current cmd during gross error, "
4200 "resetting bus\n", esp
->esp_id
));
4201 what_next
= do_reset_bus
;
4206 if (sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_HNDL_ERROR
) {
4207 /* A DMA gate array error. Here we must
4208 * be seeing one of two things. Either the
4209 * virtual to physical address translation
4210 * on the SBUS could not occur, else the
4211 * translation it did get pointed to a bogus
4214 ESPLOG(("esp%d: DMA error %08x\n", esp
->esp_id
,
4215 sbus_readl(esp
->dregs
+ DMA_CSR
)));
4217 /* DMA gate array itself must be reset to clear the
4222 what_next
= do_reset_bus
;
4226 esp
->ireg
= sbus_readb(esp
->eregs
+ ESP_INTRPT
); /* Unlatch intr reg */
4228 if (esp
->erev
== fashme
) {
4229 /* This chip is really losing. */
4232 ESPHME(("sreg2=%02x,", esp
->sreg2
));
4233 /* Must latch fifo before reading the interrupt
4234 * register else garbage ends up in the FIFO
4235 * which confuses the driver utterly.
4237 if (!(esp
->sreg2
& ESP_STAT2_FEMPTY
) ||
4238 (esp
->sreg2
& ESP_STAT2_F1BYTE
)) {
4239 ESPHME(("fifo_workaround]"));
4242 ESPHME(("no_fifo_workaround]"));
4246 /* No current cmd is only valid at this point when there are
4247 * commands off the bus or we are trying a reset.
4249 if (!SCptr
&& !esp
->disconnected_SC
&& !(esp
->ireg
& ESP_INTR_SR
)) {
4250 /* Panic is safe, since current_SC is null. */
4251 ESPLOG(("esp%d: no command in esp_handle()\n", esp
->esp_id
));
4252 panic("esp_handle: current_SC == penguin within interrupt!");
4255 if (esp
->ireg
& (ESP_INTR_IC
)) {
4256 /* Illegal command fed to ESP. Outside of obvious
4257 * software bugs that could cause this, there is
4258 * a condition with esp100 where we can confuse the
4259 * ESP into an erroneous illegal command interrupt
4260 * because it does not scrape the FIFO properly
4261 * for reselection. See esp100_reconnect_hwbug()
4262 * to see how we try very hard to avoid this.
4264 ESPLOG(("esp%d: illegal command\n", esp
->esp_id
));
4266 esp_dump_state(esp
);
4268 if (SCptr
!= NULL
) {
4269 /* Devices with very buggy firmware can drop BSY
4270 * during a scatter list interrupt when using sync
4271 * mode transfers. We continue the transfer as
4272 * expected, the target drops the bus, the ESP
4273 * gets confused, and we get a illegal command
4274 * interrupt because the bus is in the disconnected
4275 * state now and ESP_CMD_TI is only allowed when
4276 * a nexus is alive on the bus.
4278 ESPLOG(("esp%d: Forcing async and disabling disconnect for "
4279 "target %d\n", esp
->esp_id
, SCptr
->target
));
4280 SCptr
->device
->borken
= 1; /* foo on you */
4283 what_next
= do_reset_bus
;
4284 } else if (!(esp
->ireg
& ~(ESP_INTR_FDONE
| ESP_INTR_BSERV
| ESP_INTR_DC
))) {
4286 unsigned int phase
= SCptr
->SCp
.phase
;
4288 if (phase
& in_phases_mask
) {
4289 what_next
= esp_work_bus(esp
);
4290 } else if (phase
& in_slct_mask
) {
4291 what_next
= esp_select_complete(esp
);
4293 ESPLOG(("esp%d: interrupt for no good reason...\n",
4295 what_next
= do_intr_end
;
4298 ESPLOG(("esp%d: BSERV or FDONE or DC while SCptr==NULL\n",
4300 what_next
= do_reset_bus
;
4302 } else if (esp
->ireg
& ESP_INTR_SR
) {
4303 ESPLOG(("esp%d: SCSI bus reset interrupt\n", esp
->esp_id
));
4304 what_next
= do_reset_complete
;
4305 } else if (esp
->ireg
& (ESP_INTR_S
| ESP_INTR_SATN
)) {
4306 ESPLOG(("esp%d: AIEEE we have been selected by another initiator!\n",
4308 what_next
= do_reset_bus
;
4309 } else if (esp
->ireg
& ESP_INTR_RSEL
) {
4310 if (SCptr
== NULL
) {
4312 what_next
= esp_do_reconnect(esp
);
4313 } else if (SCptr
->SCp
.phase
& in_slct_mask
) {
4314 /* Only selection code knows how to clean
4317 ESPDISC(("Reselected during selection attempt\n"));
4318 what_next
= esp_select_complete(esp
);
4320 ESPLOG(("esp%d: Reselected while bus is busy\n",
4322 what_next
= do_reset_bus
;
4326 /* This is tier-one in our dual level SCSI state machine. */
4328 while (what_next
!= do_intr_end
) {
4329 if (what_next
>= do_phase_determine
&&
4330 what_next
< do_intr_end
) {
4331 what_next
= isvc_vector
[what_next
](esp
);
4333 /* state is completely lost ;-( */
4334 ESPLOG(("esp%d: interrupt engine loses state, resetting bus\n",
4336 what_next
= do_reset_bus
;
4341 /* Service only the ESP described by dev_id. */
4342 static void esp_intr(int irq
, void *dev_id
, struct pt_regs
*pregs
)
4344 struct esp
*esp
= dev_id
;
4345 unsigned long flags
;
4347 spin_lock_irqsave(&esp
->lock
, flags
);
4348 if (ESP_IRQ_P(esp
->dregs
)) {
4349 ESP_INTSOFF(esp
->dregs
);
4351 ESPIRQ(("I[%d:%d](", smp_processor_id(), esp
->esp_id
));
4355 ESP_INTSON(esp
->dregs
);
4357 spin_unlock_irqrestore(&esp
->lock
, flags
);
4360 int esp_revoke(Scsi_Device
* SDptr
)
4362 struct esp
*esp
= (struct esp
*) SDptr
->host
->hostdata
;
4363 esp
->targets_present
&= ~(1 << SDptr
->id
);
4367 static Scsi_Host_Template driver_template
= SCSI_SPARC_ESP
;
4369 #include "scsi_module.c"