1 /* $Id: esp.c,v 1.101 2002/01/15 06:48:55 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/slab.h>
22 #include <linux/blkdev.h>
23 #include <linux/proc_fs.h>
24 #include <linux/stat.h>
25 #include <linux/init.h>
26 #include <linux/spinlock.h>
27 #include <linux/interrupt.h>
28 #include <linux/module.h>
34 #include <asm/system.h>
35 #include <asm/ptrace.h>
36 #include <asm/pgtable.h>
37 #include <asm/oplib.h>
41 #include <asm/machines.h>
42 #include <asm/idprom.h>
45 #include <scsi/scsi.h>
46 #include <scsi/scsi_cmnd.h>
47 #include <scsi/scsi_device.h>
48 #include <scsi/scsi_eh.h>
49 #include <scsi/scsi_host.h>
50 #include <scsi/scsi_tcq.h>
53 /* #define DEBUG_ESP_HME */
54 /* #define DEBUG_ESP_DATA */
55 /* #define DEBUG_ESP_QUEUE */
56 /* #define DEBUG_ESP_DISCONNECT */
57 /* #define DEBUG_ESP_STATUS */
58 /* #define DEBUG_ESP_PHASES */
59 /* #define DEBUG_ESP_WORKBUS */
60 /* #define DEBUG_STATE_MACHINE */
61 /* #define DEBUG_ESP_CMDS */
62 /* #define DEBUG_ESP_IRQS */
63 /* #define DEBUG_SDTR */
64 /* #define DEBUG_ESP_SG */
66 /* Use the following to sprinkle debugging messages in a way which
67 * suits you if combinations of the above become too verbose when
68 * trying to track down a specific problem.
70 /* #define DEBUG_ESP_MISC */
72 #if defined(DEBUG_ESP)
73 #define ESPLOG(foo) printk foo
76 #endif /* (DEBUG_ESP) */
78 #if defined(DEBUG_ESP_HME)
79 #define ESPHME(foo) printk foo
84 #if defined(DEBUG_ESP_DATA)
85 #define ESPDATA(foo) printk foo
90 #if defined(DEBUG_ESP_QUEUE)
91 #define ESPQUEUE(foo) printk foo
96 #if defined(DEBUG_ESP_DISCONNECT)
97 #define ESPDISC(foo) printk foo
102 #if defined(DEBUG_ESP_STATUS)
103 #define ESPSTAT(foo) printk foo
108 #if defined(DEBUG_ESP_PHASES)
109 #define ESPPHASE(foo) printk foo
111 #define ESPPHASE(foo)
114 #if defined(DEBUG_ESP_WORKBUS)
115 #define ESPBUS(foo) printk foo
120 #if defined(DEBUG_ESP_IRQS)
121 #define ESPIRQ(foo) printk foo
126 #if defined(DEBUG_SDTR)
127 #define ESPSDTR(foo) printk foo
132 #if defined(DEBUG_ESP_MISC)
133 #define ESPMISC(foo) printk foo
138 /* Command phase enumeration. */
140 not_issued
= 0x00, /* Still in the issue_SC queue. */
142 /* Various forms of selecting a target. */
143 #define in_slct_mask 0x10
144 in_slct_norm
= 0x10, /* ESP is arbitrating, normal selection */
145 in_slct_stop
= 0x11, /* ESP will select, then stop with IRQ */
146 in_slct_msg
= 0x12, /* select, then send a message */
147 in_slct_tag
= 0x13, /* select and send tagged queue msg */
148 in_slct_sneg
= 0x14, /* select and acquire sync capabilities */
150 /* Any post selection activity. */
151 #define in_phases_mask 0x20
152 in_datain
= 0x20, /* Data is transferring from the bus */
153 in_dataout
= 0x21, /* Data is transferring to the bus */
154 in_data_done
= 0x22, /* Last DMA data operation done (maybe) */
155 in_msgin
= 0x23, /* Eating message from target */
156 in_msgincont
= 0x24, /* Eating more msg bytes from target */
157 in_msgindone
= 0x25, /* Decide what to do with what we got */
158 in_msgout
= 0x26, /* Sending message to target */
159 in_msgoutdone
= 0x27, /* Done sending msg out */
160 in_cmdbegin
= 0x28, /* Sending cmd after abnormal selection */
161 in_cmdend
= 0x29, /* Done sending slow cmd */
162 in_status
= 0x2a, /* Was in status phase, finishing cmd */
163 in_freeing
= 0x2b, /* freeing the bus for cmd cmplt or disc */
164 in_the_dark
= 0x2c, /* Don't know what bus phase we are in */
166 /* Special states, ie. not normal bus transitions... */
167 #define in_spec_mask 0x80
168 in_abortone
= 0x80, /* Aborting one command currently */
169 in_abortall
= 0x81, /* Blowing away all commands we have */
170 in_resetdev
= 0x82, /* SCSI target reset in progress */
171 in_resetbus
= 0x83, /* SCSI bus reset in progress */
172 in_tgterror
= 0x84, /* Target did something stupid */
176 /* Zero has special meaning, see skipahead[12]. */
179 /*1*/ do_phase_determine
,
181 /*3*/ do_reset_complete
,
186 /* The master ring of all esp hosts we are managing in this driver. */
187 static struct esp
*espchain
;
188 static spinlock_t espchain_lock
= SPIN_LOCK_UNLOCKED
;
189 static int esps_running
= 0;
191 /* Forward declarations. */
192 static irqreturn_t
esp_intr(int irq
, void *dev_id
, struct pt_regs
*pregs
);
194 /* Debugging routines */
195 struct esp_cmdstrings
{
198 } esp_cmd_strings
[] = {
200 { ESP_CMD_NULL
, "ESP_NOP", },
201 { ESP_CMD_FLUSH
, "FIFO_FLUSH", },
202 { ESP_CMD_RC
, "RSTESP", },
203 { ESP_CMD_RS
, "RSTSCSI", },
204 /* Disconnected State Group */
205 { ESP_CMD_RSEL
, "RESLCTSEQ", },
206 { ESP_CMD_SEL
, "SLCTNATN", },
207 { ESP_CMD_SELA
, "SLCTATN", },
208 { ESP_CMD_SELAS
, "SLCTATNSTOP", },
209 { ESP_CMD_ESEL
, "ENSLCTRESEL", },
210 { ESP_CMD_DSEL
, "DISSELRESEL", },
211 { ESP_CMD_SA3
, "SLCTATN3", },
212 { ESP_CMD_RSEL3
, "RESLCTSEQ", },
213 /* Target State Group */
214 { ESP_CMD_SMSG
, "SNDMSG", },
215 { ESP_CMD_SSTAT
, "SNDSTATUS", },
216 { ESP_CMD_SDATA
, "SNDDATA", },
217 { ESP_CMD_DSEQ
, "DISCSEQ", },
218 { ESP_CMD_TSEQ
, "TERMSEQ", },
219 { ESP_CMD_TCCSEQ
, "TRGTCMDCOMPSEQ", },
220 { ESP_CMD_DCNCT
, "DISC", },
221 { ESP_CMD_RMSG
, "RCVMSG", },
222 { ESP_CMD_RCMD
, "RCVCMD", },
223 { ESP_CMD_RDATA
, "RCVDATA", },
224 { ESP_CMD_RCSEQ
, "RCVCMDSEQ", },
225 /* Initiator State Group */
226 { ESP_CMD_TI
, "TRANSINFO", },
227 { ESP_CMD_ICCSEQ
, "INICMDSEQCOMP", },
228 { ESP_CMD_MOK
, "MSGACCEPTED", },
229 { ESP_CMD_TPAD
, "TPAD", },
230 { ESP_CMD_SATN
, "SATN", },
231 { ESP_CMD_RATN
, "RATN", },
233 #define NUM_ESP_COMMANDS ((sizeof(esp_cmd_strings)) / (sizeof(struct esp_cmdstrings)))
235 /* Print textual representation of an ESP command */
236 static inline void esp_print_cmd(u8 espcmd
)
238 u8 dma_bit
= espcmd
& ESP_CMD_DMA
;
242 for (i
= 0; i
< NUM_ESP_COMMANDS
; i
++)
243 if (esp_cmd_strings
[i
].cmdchar
== espcmd
)
245 if (i
== NUM_ESP_COMMANDS
)
246 printk("ESP_Unknown");
248 printk("%s%s", esp_cmd_strings
[i
].text
,
249 ((dma_bit
) ? "+DMA" : ""));
252 /* Print the status register's value */
253 static inline void esp_print_statreg(u8 statreg
)
258 phase
= statreg
& ESP_STAT_PMASK
;
259 printk("%s,", (phase
== ESP_DOP
? "DATA-OUT" :
260 (phase
== ESP_DIP
? "DATA-IN" :
261 (phase
== ESP_CMDP
? "COMMAND" :
262 (phase
== ESP_STATP
? "STATUS" :
263 (phase
== ESP_MOP
? "MSG-OUT" :
264 (phase
== ESP_MIP
? "MSG_IN" :
266 if (statreg
& ESP_STAT_TDONE
)
267 printk("TRANS_DONE,");
268 if (statreg
& ESP_STAT_TCNT
)
269 printk("TCOUNT_ZERO,");
270 if (statreg
& ESP_STAT_PERR
)
272 if (statreg
& ESP_STAT_SPAM
)
274 if (statreg
& ESP_STAT_INTR
)
279 /* Print the interrupt register's value */
280 static inline void esp_print_ireg(u8 intreg
)
283 if (intreg
& ESP_INTR_S
)
284 printk("SLCT_NATN ");
285 if (intreg
& ESP_INTR_SATN
)
287 if (intreg
& ESP_INTR_RSEL
)
289 if (intreg
& ESP_INTR_FDONE
)
291 if (intreg
& ESP_INTR_BSERV
)
293 if (intreg
& ESP_INTR_DC
)
295 if (intreg
& ESP_INTR_IC
)
297 if (intreg
& ESP_INTR_SR
)
298 printk("SCSI_BUS_RESET ");
302 /* Print the sequence step registers contents */
303 static inline void esp_print_seqreg(u8 stepreg
)
305 stepreg
&= ESP_STEP_VBITS
;
307 (stepreg
== ESP_STEP_ASEL
? "SLCT_ARB_CMPLT" :
308 (stepreg
== ESP_STEP_SID
? "1BYTE_MSG_SENT" :
309 (stepreg
== ESP_STEP_NCMD
? "NOT_IN_CMD_PHASE" :
310 (stepreg
== ESP_STEP_PPC
? "CMD_BYTES_LOST" :
311 (stepreg
== ESP_STEP_FINI4
? "CMD_SENT_OK" :
315 static char *phase_string(int phase
)
371 #ifdef DEBUG_STATE_MACHINE
372 static inline void esp_advance_phase(struct scsi_cmnd
*s
, int newphase
)
374 ESPLOG(("<%s>", phase_string(newphase
)));
375 s
->SCp
.sent_command
= s
->SCp
.phase
;
376 s
->SCp
.phase
= newphase
;
379 #define esp_advance_phase(__s, __newphase) \
380 (__s)->SCp.sent_command = (__s)->SCp.phase; \
381 (__s)->SCp.phase = (__newphase);
384 #ifdef DEBUG_ESP_CMDS
385 static inline void esp_cmd(struct esp
*esp
, u8 cmd
)
387 esp
->espcmdlog
[esp
->espcmdent
] = cmd
;
388 esp
->espcmdent
= (esp
->espcmdent
+ 1) & 31;
389 sbus_writeb(cmd
, esp
->eregs
+ ESP_CMD
);
392 #define esp_cmd(__esp, __cmd) \
393 sbus_writeb((__cmd), ((__esp)->eregs) + ESP_CMD)
396 #define ESP_INTSOFF(__dregs) \
397 sbus_writel(sbus_readl((__dregs)+DMA_CSR)&~(DMA_INT_ENAB), (__dregs)+DMA_CSR)
398 #define ESP_INTSON(__dregs) \
399 sbus_writel(sbus_readl((__dregs)+DMA_CSR)|DMA_INT_ENAB, (__dregs)+DMA_CSR)
400 #define ESP_IRQ_P(__dregs) \
401 (sbus_readl((__dregs)+DMA_CSR) & (DMA_HNDL_INTR|DMA_HNDL_ERROR))
403 /* How we use the various Linux SCSI data structures for operation.
407 * We keep track of the synchronous capabilities of a target
408 * in the device member, using sync_min_period and
409 * sync_max_offset. These are the values we directly write
410 * into the ESP registers while running a command. If offset
411 * is zero the ESP will use asynchronous transfers.
412 * If the borken flag is set we assume we shouldn't even bother
413 * trying to negotiate for synchronous transfer as this target
414 * is really stupid. If we notice the target is dropping the
415 * bus, and we have been allowing it to disconnect, we clear
416 * the disconnect flag.
420 /* Manipulation of the ESP command queues. Thanks to the aha152x driver
421 * and its author, Juergen E. Fischer, for the methods used here.
422 * Note that these are per-ESP queues, not global queues like
423 * the aha152x driver uses.
425 static inline void append_SC(struct scsi_cmnd
**SC
, struct scsi_cmnd
*new_SC
)
427 struct scsi_cmnd
*end
;
429 new_SC
->host_scribble
= (unsigned char *) NULL
;
433 for (end
=*SC
;end
->host_scribble
;end
=(struct scsi_cmnd
*)end
->host_scribble
)
435 end
->host_scribble
= (unsigned char *) new_SC
;
439 static inline void prepend_SC(struct scsi_cmnd
**SC
, struct scsi_cmnd
*new_SC
)
441 new_SC
->host_scribble
= (unsigned char *) *SC
;
445 static inline struct scsi_cmnd
*remove_first_SC(struct scsi_cmnd
**SC
)
447 struct scsi_cmnd
*ptr
;
450 *SC
= (struct scsi_cmnd
*) (*SC
)->host_scribble
;
454 static inline struct scsi_cmnd
*remove_SC(struct scsi_cmnd
**SC
, int target
, int lun
)
456 struct scsi_cmnd
*ptr
, *prev
;
458 for (ptr
= *SC
, prev
= NULL
;
459 ptr
&& ((ptr
->device
->id
!= target
) || (ptr
->device
->lun
!= lun
));
460 prev
= ptr
, ptr
= (struct scsi_cmnd
*) ptr
->host_scribble
)
464 prev
->host_scribble
=ptr
->host_scribble
;
466 *SC
=(struct scsi_cmnd
*)ptr
->host_scribble
;
471 /* Resetting various pieces of the ESP scsi driver chipset/buses. */
472 static void esp_reset_dma(struct esp
*esp
)
474 int can_do_burst16
, can_do_burst32
, can_do_burst64
;
478 can_do_burst16
= (esp
->bursts
& DMA_BURST16
) != 0;
479 can_do_burst32
= (esp
->bursts
& DMA_BURST32
) != 0;
482 if (sbus_can_dma_64bit(esp
->sdev
))
484 if (sbus_can_burst64(esp
->sdev
))
485 can_do_burst64
= (esp
->bursts
& DMA_BURST64
) != 0;
487 /* Punt the DVMA into a known state. */
488 if (esp
->dma
->revision
!= dvmahme
) {
489 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
490 sbus_writel(tmp
| DMA_RST_SCSI
, esp
->dregs
+ DMA_CSR
);
491 sbus_writel(tmp
& ~DMA_RST_SCSI
, esp
->dregs
+ DMA_CSR
);
493 switch (esp
->dma
->revision
) {
495 /* This is the HME DVMA gate array. */
497 sbus_writel(DMA_RESET_FAS366
, esp
->dregs
+ DMA_CSR
);
498 sbus_writel(DMA_RST_SCSI
, esp
->dregs
+ DMA_CSR
);
500 esp
->prev_hme_dmacsr
= (DMA_PARITY_OFF
|DMA_2CLKS
|DMA_SCSI_DISAB
|DMA_INT_ENAB
);
501 esp
->prev_hme_dmacsr
&= ~(DMA_ENABLE
|DMA_ST_WRITE
|DMA_BRST_SZ
);
504 esp
->prev_hme_dmacsr
|= DMA_BRST64
;
505 else if (can_do_burst32
)
506 esp
->prev_hme_dmacsr
|= DMA_BRST32
;
509 esp
->prev_hme_dmacsr
|= DMA_SCSI_SBUS64
;
510 sbus_set_sbus64(esp
->sdev
, esp
->bursts
);
513 /* This chip is horrible. */
514 while (sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_PEND_READ
)
517 sbus_writel(0, esp
->dregs
+ DMA_CSR
);
518 sbus_writel(esp
->prev_hme_dmacsr
, esp
->dregs
+ DMA_CSR
);
520 /* This is necessary to avoid having the SCSI channel
521 * engine lock up on us.
523 sbus_writel(0, esp
->dregs
+ DMA_ADDR
);
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 /* Command queues... */
1039 esp
->current_SC
= NULL
;
1040 esp
->disconnected_SC
= NULL
;
1041 esp
->issue_SC
= NULL
;
1043 /* Target and current command state... */
1044 esp
->targets_present
= 0;
1045 esp
->resetting_bus
= 0;
1048 init_waitqueue_head(&esp
->reset_queue
);
1051 for(i
= 0; i
< 32; i
++)
1052 esp
->espcmdlog
[i
] = 0;
1055 /* MSG phase state... */
1056 for(i
= 0; i
< 16; i
++) {
1057 esp
->cur_msgout
[i
] = 0;
1058 esp
->cur_msgin
[i
] = 0;
1060 esp
->prevmsgout
= esp
->prevmsgin
= 0;
1061 esp
->msgout_len
= esp
->msgin_len
= 0;
1063 /* Clear the one behind caches to hold unmatchable values. */
1064 esp
->prev_soff
= esp
->prev_stp
= esp
->prev_cfg3
= 0xff;
1065 esp
->prev_hme_dmacsr
= 0xffffffff;
1068 static int __init
detect_one_esp(struct scsi_host_template
*tpnt
, struct sbus_dev
*esp_dev
,
1069 struct sbus_dev
*espdma
, struct sbus_bus
*sbus
,
1072 struct Scsi_Host
*esp_host
= scsi_register(tpnt
, sizeof(struct esp
));
1076 printk("ESP: Cannot register SCSI host\n");
1080 esp_host
->max_id
= 16;
1081 esp
= (struct esp
*) esp_host
->hostdata
;
1082 esp
->ehost
= esp_host
;
1083 esp
->sdev
= esp_dev
;
1085 esp
->prom_node
= esp_dev
->prom_node
;
1086 prom_getstring(esp
->prom_node
, "name", esp
->prom_name
,
1087 sizeof(esp
->prom_name
));
1090 if (esp_find_dvma(esp
, espdma
) < 0)
1092 if (esp_map_regs(esp
, hme
) < 0) {
1093 printk("ESP registers unmappable");
1094 goto fail_dvma_release
;
1096 if (esp_map_cmdarea(esp
) < 0) {
1097 printk("ESP DVMA transport area unmappable");
1098 goto fail_unmap_regs
;
1100 if (esp_register_irq(esp
) < 0)
1101 goto fail_unmap_cmdarea
;
1103 esp_get_scsi_id(esp
);
1105 esp
->diff
= prom_getbool(esp
->prom_node
, "differential");
1107 printk("Differential ");
1109 esp_get_clock_params(esp
);
1110 esp_get_bursts(esp
, espdma
);
1111 esp_get_revision(esp
);
1112 esp_init_swstate(esp
);
1114 esp_bootup_reset(esp
);
1119 sbus_free_consistent(esp
->sdev
, 16,
1120 (void *) esp
->esp_command
,
1121 esp
->esp_command_dvma
);
1124 sbus_iounmap(esp
->eregs
, ESP_REG_SIZE
);
1127 esp
->dma
->allocated
= 0;
1131 scsi_unregister(esp_host
);
1135 /* Detecting ESP chips on the machine. This is the simple and easy
1141 #include <asm/sun4paddr.h>
1143 static int __init
esp_detect(struct scsi_host_template
*tpnt
)
1145 static struct sbus_dev esp_dev
;
1146 int esps_in_use
= 0;
1150 if (sun4_esp_physaddr
) {
1151 memset (&esp_dev
, 0, sizeof(esp_dev
));
1152 esp_dev
.reg_addrs
[0].phys_addr
= sun4_esp_physaddr
;
1153 esp_dev
.irqs
[0] = 4;
1154 esp_dev
.resource
[0].start
= sun4_esp_physaddr
;
1155 esp_dev
.resource
[0].end
= sun4_esp_physaddr
+ ESP_REG_SIZE
- 1;
1156 esp_dev
.resource
[0].flags
= IORESOURCE_IO
;
1158 if (!detect_one_esp(tpnt
, &esp_dev
, NULL
, NULL
, 0, 0))
1160 printk("ESP: Total of 1 ESP hosts found, %d actually in use.\n", esps_in_use
);
1161 esps_running
= esps_in_use
;
1166 #else /* !CONFIG_SUN4 */
1168 static int __init
esp_detect(struct scsi_host_template
*tpnt
)
1170 struct sbus_bus
*sbus
;
1171 struct sbus_dev
*esp_dev
, *sbdev_iter
;
1172 int nesps
= 0, esps_in_use
= 0;
1179 panic("No SBUS in esp_detect()");
1182 for_each_sbus(sbus
) {
1183 for_each_sbusdev(sbdev_iter
, sbus
) {
1184 struct sbus_dev
*espdma
= NULL
;
1187 /* Is it an esp sbus device? */
1188 esp_dev
= sbdev_iter
;
1189 if (strcmp(esp_dev
->prom_name
, "esp") &&
1190 strcmp(esp_dev
->prom_name
, "SUNW,esp")) {
1191 if (!strcmp(esp_dev
->prom_name
, "SUNW,fas")) {
1195 if (!esp_dev
->child
||
1196 (strcmp(esp_dev
->prom_name
, "espdma") &&
1197 strcmp(esp_dev
->prom_name
, "dma")))
1198 continue; /* nope... */
1200 esp_dev
= esp_dev
->child
;
1201 if (strcmp(esp_dev
->prom_name
, "esp") &&
1202 strcmp(esp_dev
->prom_name
, "SUNW,esp"))
1203 continue; /* how can this happen? */
1207 if (detect_one_esp(tpnt
, esp_dev
, espdma
, sbus
, nesps
++, hme
) < 0)
1211 } /* for each sbusdev */
1212 } /* for each sbus */
1213 printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps
,
1215 esps_running
= esps_in_use
;
1219 #endif /* !CONFIG_SUN4 */
1223 static int esp_release(struct Scsi_Host
*host
)
1225 struct esp
*esp
= (struct esp
*) host
->hostdata
;
1227 ESP_INTSOFF(esp
->dregs
);
1233 free_irq(esp
->ehost
->irq
, esp
);
1234 sbus_free_consistent(esp
->sdev
, 16,
1235 (void *) esp
->esp_command
, esp
->esp_command_dvma
);
1236 sbus_iounmap(esp
->eregs
, ESP_REG_SIZE
);
1237 esp
->dma
->allocated
= 0;
1243 /* The info function will return whatever useful
1244 * information the developer sees fit. If not provided, then
1245 * the name field will be used instead.
1247 static const char *esp_info(struct Scsi_Host
*host
)
1251 esp
= (struct esp
*) host
->hostdata
;
1252 switch (esp
->erev
) {
1254 return "Sparc ESP100 (NCR53C90)";
1256 return "Sparc ESP100A (NCR53C90A)";
1258 return "Sparc ESP236";
1260 return "Sparc ESP236-FAST";
1262 return "Sparc ESP366-HME";
1264 return "Sparc ESP100A-FAST";
1266 return "Bogon ESP revision";
1270 /* From Wolfgang Stanglmeier's NCR scsi driver. */
1279 static void copy_mem_info(struct info_str
*info
, char *data
, int len
)
1281 if (info
->pos
+ len
> info
->length
)
1282 len
= info
->length
- info
->pos
;
1284 if (info
->pos
+ len
< info
->offset
) {
1288 if (info
->pos
< info
->offset
) {
1289 data
+= (info
->offset
- info
->pos
);
1290 len
-= (info
->offset
- info
->pos
);
1294 memcpy(info
->buffer
+ info
->pos
, data
, len
);
1299 static int copy_info(struct info_str
*info
, char *fmt
, ...)
1305 va_start(args
, fmt
);
1306 len
= vsprintf(buf
, fmt
, args
);
1309 copy_mem_info(info
, buf
, len
);
1313 static int esp_host_info(struct esp
*esp
, char *ptr
, off_t offset
, int len
)
1315 struct scsi_device
*sdev
;
1316 struct info_str info
;
1321 info
.offset
= offset
;
1324 copy_info(&info
, "Sparc ESP Host Adapter:\n");
1325 copy_info(&info
, "\tPROM node\t\t%08x\n", (unsigned int) esp
->prom_node
);
1326 copy_info(&info
, "\tPROM name\t\t%s\n", esp
->prom_name
);
1327 copy_info(&info
, "\tESP Model\t\t");
1328 switch (esp
->erev
) {
1330 copy_info(&info
, "ESP100\n");
1333 copy_info(&info
, "ESP100A\n");
1336 copy_info(&info
, "ESP236\n");
1339 copy_info(&info
, "FAS236\n");
1342 copy_info(&info
, "FAS100A\n");
1345 copy_info(&info
, "FAST\n");
1348 copy_info(&info
, "Happy Meal FAS\n");
1352 copy_info(&info
, "Unknown!\n");
1355 copy_info(&info
, "\tDMA Revision\t\t");
1356 switch (esp
->dma
->revision
) {
1358 copy_info(&info
, "Rev 0\n");
1361 copy_info(&info
, "ESC Rev 1\n");
1364 copy_info(&info
, "Rev 1\n");
1367 copy_info(&info
, "Rev 2\n");
1370 copy_info(&info
, "Rev 3\n");
1373 copy_info(&info
, "Rev 1+\n");
1376 copy_info(&info
, "Rev HME/FAS\n");
1379 copy_info(&info
, "Unknown!\n");
1382 copy_info(&info
, "\tLive Targets\t\t[ ");
1383 for (i
= 0; i
< 15; i
++) {
1384 if (esp
->targets_present
& (1 << i
))
1385 copy_info(&info
, "%d ", i
);
1387 copy_info(&info
, "]\n\n");
1389 /* Now describe the state of each existing target. */
1390 copy_info(&info
, "Target #\tconfig3\t\tSync Capabilities\tDisconnect\tWide\n");
1392 shost_for_each_device(sdev
, esp
->ehost
) {
1393 struct esp_device
*esp_dev
= sdev
->hostdata
;
1396 if (!(esp
->targets_present
& (1 << id
)))
1399 copy_info(&info
, "%d\t\t", id
);
1400 copy_info(&info
, "%08lx\t", esp
->config3
[id
]);
1401 copy_info(&info
, "[%02lx,%02lx]\t\t\t",
1402 esp_dev
->sync_max_offset
,
1403 esp_dev
->sync_min_period
);
1404 copy_info(&info
, "%s\t\t",
1405 esp_dev
->disconnect
? "yes" : "no");
1406 copy_info(&info
, "%s\n",
1407 (esp
->config3
[id
] & ESP_CONFIG3_EWIDE
) ? "yes" : "no");
1409 return info
.pos
> info
.offset
? info
.pos
- info
.offset
: 0;
1412 /* ESP proc filesystem code. */
1413 static int esp_proc_info(struct Scsi_Host
*host
, char *buffer
, char **start
, off_t offset
,
1414 int length
, int inout
)
1419 return -EINVAL
; /* not yet */
1422 if (esp
->ehost
== host
)
1431 return esp_host_info(esp
, buffer
, offset
, length
);
1434 static void esp_get_dmabufs(struct esp
*esp
, struct scsi_cmnd
*sp
)
1436 if (sp
->use_sg
== 0) {
1437 sp
->SCp
.this_residual
= sp
->request_bufflen
;
1438 sp
->SCp
.buffer
= (struct scatterlist
*) sp
->request_buffer
;
1439 sp
->SCp
.buffers_residual
= 0;
1440 if (sp
->request_bufflen
) {
1441 sp
->SCp
.have_data_in
= sbus_map_single(esp
->sdev
, sp
->SCp
.buffer
,
1442 sp
->SCp
.this_residual
,
1443 sp
->sc_data_direction
);
1444 sp
->SCp
.ptr
= (char *) ((unsigned long)sp
->SCp
.have_data_in
);
1449 sp
->SCp
.buffer
= (struct scatterlist
*) sp
->buffer
;
1450 sp
->SCp
.buffers_residual
= sbus_map_sg(esp
->sdev
,
1453 sp
->sc_data_direction
);
1454 sp
->SCp
.this_residual
= sg_dma_len(sp
->SCp
.buffer
);
1455 sp
->SCp
.ptr
= (char *) ((unsigned long)sg_dma_address(sp
->SCp
.buffer
));
1459 static void esp_release_dmabufs(struct esp
*esp
, struct scsi_cmnd
*sp
)
1462 sbus_unmap_sg(esp
->sdev
, sp
->buffer
, sp
->use_sg
,
1463 sp
->sc_data_direction
);
1464 } else if (sp
->request_bufflen
) {
1465 sbus_unmap_single(esp
->sdev
,
1466 sp
->SCp
.have_data_in
,
1467 sp
->request_bufflen
,
1468 sp
->sc_data_direction
);
1472 static void esp_restore_pointers(struct esp
*esp
, struct scsi_cmnd
*sp
)
1474 struct esp_pointers
*ep
= &esp
->data_pointers
[sp
->device
->id
];
1476 sp
->SCp
.ptr
= ep
->saved_ptr
;
1477 sp
->SCp
.buffer
= ep
->saved_buffer
;
1478 sp
->SCp
.this_residual
= ep
->saved_this_residual
;
1479 sp
->SCp
.buffers_residual
= ep
->saved_buffers_residual
;
1482 static void esp_save_pointers(struct esp
*esp
, struct scsi_cmnd
*sp
)
1484 struct esp_pointers
*ep
= &esp
->data_pointers
[sp
->device
->id
];
1486 ep
->saved_ptr
= sp
->SCp
.ptr
;
1487 ep
->saved_buffer
= sp
->SCp
.buffer
;
1488 ep
->saved_this_residual
= sp
->SCp
.this_residual
;
1489 ep
->saved_buffers_residual
= sp
->SCp
.buffers_residual
;
1494 * 1) Never ever panic while something is live on the bus.
1495 * If there is to be any chance of syncing the disks this
1496 * rule is to be obeyed.
1498 * 2) Any target that causes a foul condition will no longer
1499 * have synchronous transfers done to it, no questions
1502 * 3) Keep register accesses to a minimum. Think about some
1503 * day when we have Xbus machines this is running on and
1504 * the ESP chip is on the other end of the machine on a
1505 * different board from the cpu where this is running.
1508 /* Fire off a command. We assume the bus is free and that the only
1509 * case where we could see an interrupt is where we have disconnected
1510 * commands active and they are trying to reselect us.
1512 static inline void esp_check_cmd(struct esp
*esp
, struct scsi_cmnd
*sp
)
1514 switch (sp
->cmd_len
) {
1518 esp
->esp_slowcmd
= 0;
1522 esp
->esp_slowcmd
= 1;
1523 esp
->esp_scmdleft
= sp
->cmd_len
;
1524 esp
->esp_scmdp
= &sp
->cmnd
[0];
1529 static inline void build_sync_nego_msg(struct esp
*esp
, int period
, int offset
)
1531 esp
->cur_msgout
[0] = EXTENDED_MESSAGE
;
1532 esp
->cur_msgout
[1] = 3;
1533 esp
->cur_msgout
[2] = EXTENDED_SDTR
;
1534 esp
->cur_msgout
[3] = period
;
1535 esp
->cur_msgout
[4] = offset
;
1536 esp
->msgout_len
= 5;
1539 /* SIZE is in bits, currently HME only supports 16 bit wide transfers. */
1540 static inline void build_wide_nego_msg(struct esp
*esp
, int size
)
1542 esp
->cur_msgout
[0] = EXTENDED_MESSAGE
;
1543 esp
->cur_msgout
[1] = 2;
1544 esp
->cur_msgout
[2] = EXTENDED_WDTR
;
1547 esp
->cur_msgout
[3] = 2;
1550 esp
->cur_msgout
[3] = 1;
1554 esp
->cur_msgout
[3] = 0;
1558 esp
->msgout_len
= 4;
1561 static void esp_exec_cmd(struct esp
*esp
)
1563 struct scsi_cmnd
*SCptr
;
1564 struct scsi_device
*SDptr
;
1565 struct esp_device
*esp_dev
;
1566 volatile u8
*cmdp
= esp
->esp_command
;
1571 /* Hold off if we have disconnected commands and
1572 * an IRQ is showing...
1574 if (esp
->disconnected_SC
&& ESP_IRQ_P(esp
->dregs
))
1577 /* Grab first member of the issue queue. */
1578 SCptr
= esp
->current_SC
= remove_first_SC(&esp
->issue_SC
);
1580 /* Safe to panic here because current_SC is null. */
1582 panic("esp: esp_exec_cmd and issue queue is NULL");
1584 SDptr
= SCptr
->device
;
1585 esp_dev
= SDptr
->hostdata
;
1586 lun
= SCptr
->device
->lun
;
1587 target
= SCptr
->device
->id
;
1590 esp
->msgout_len
= 0;
1592 /* Send it out whole, or piece by piece? The ESP
1593 * only knows how to automatically send out 6, 10,
1594 * and 12 byte commands. I used to think that the
1595 * Linux SCSI code would never throw anything other
1596 * than that to us, but then again there is the
1597 * SCSI generic driver which can send us anything.
1599 esp_check_cmd(esp
, SCptr
);
1601 /* If arbitration/selection is successful, the ESP will leave
1602 * ATN asserted, causing the target to go into message out
1603 * phase. The ESP will feed the target the identify and then
1604 * the target can only legally go to one of command,
1605 * datain/out, status, or message in phase, or stay in message
1606 * out phase (should we be trying to send a sync negotiation
1607 * message after the identify). It is not allowed to drop
1608 * BSY, but some buggy targets do and we check for this
1609 * condition in the selection complete code. Most of the time
1610 * we'll make the command bytes available to the ESP and it
1611 * will not interrupt us until it finishes command phase, we
1612 * cannot do this for command sizes the ESP does not
1613 * understand and in this case we'll get interrupted right
1614 * when the target goes into command phase.
1616 * It is absolutely _illegal_ in the presence of SCSI-2 devices
1617 * to use the ESP select w/o ATN command. When SCSI-2 devices are
1618 * present on the bus we _must_ always go straight to message out
1619 * phase with an identify message for the target. Being that
1620 * selection attempts in SCSI-1 w/o ATN was an option, doing SCSI-2
1621 * selections should not confuse SCSI-1 we hope.
1624 if (esp_dev
->sync
) {
1625 /* this targets sync is known */
1626 #ifndef __sparc_v9__
1629 if (esp_dev
->disconnect
)
1630 *cmdp
++ = IDENTIFY(1, lun
);
1632 *cmdp
++ = IDENTIFY(0, lun
);
1634 if (esp
->esp_slowcmd
) {
1635 the_esp_command
= (ESP_CMD_SELAS
| ESP_CMD_DMA
);
1636 esp_advance_phase(SCptr
, in_slct_stop
);
1638 the_esp_command
= (ESP_CMD_SELA
| ESP_CMD_DMA
);
1639 esp_advance_phase(SCptr
, in_slct_norm
);
1641 } else if (!(esp
->targets_present
& (1<<target
)) || !(esp_dev
->disconnect
)) {
1642 /* After the bootup SCSI code sends both the
1643 * TEST_UNIT_READY and INQUIRY commands we want
1644 * to at least attempt allowing the device to
1647 ESPMISC(("esp: Selecting device for first time. target=%d "
1648 "lun=%d\n", target
, SCptr
->device
->lun
));
1649 if (!SDptr
->borken
&& !esp_dev
->disconnect
)
1650 esp_dev
->disconnect
= 1;
1652 *cmdp
++ = IDENTIFY(0, lun
);
1653 esp
->prevmsgout
= NOP
;
1654 esp_advance_phase(SCptr
, in_slct_norm
);
1655 the_esp_command
= (ESP_CMD_SELA
| ESP_CMD_DMA
);
1657 /* Take no chances... */
1658 esp_dev
->sync_max_offset
= 0;
1659 esp_dev
->sync_min_period
= 0;
1661 /* Sorry, I have had way too many problems with
1662 * various CDROM devices on ESP. -DaveM
1664 int cdrom_hwbug_wkaround
= 0;
1666 #ifndef __sparc_v9__
1667 /* Never allow disconnects or synchronous transfers on
1668 * SparcStation1 and SparcStation1+. Allowing those
1669 * to be enabled seems to lockup the machine completely.
1671 if ((idprom
->id_machtype
== (SM_SUN4C
| SM_4C_SS1
)) ||
1672 (idprom
->id_machtype
== (SM_SUN4C
| SM_4C_SS1PLUS
))) {
1673 /* But we are nice and allow tapes and removable
1674 * disks (but not CDROMs) to disconnect.
1676 if(SDptr
->type
== TYPE_TAPE
||
1677 (SDptr
->type
!= TYPE_ROM
&& SDptr
->removable
))
1678 esp_dev
->disconnect
= 1;
1680 esp_dev
->disconnect
= 0;
1681 esp_dev
->sync_max_offset
= 0;
1682 esp_dev
->sync_min_period
= 0;
1687 #endif /* !(__sparc_v9__) */
1689 /* We've talked to this guy before,
1690 * but never negotiated. Let's try,
1691 * need to attempt WIDE first, before
1692 * sync nego, as per SCSI 2 standard.
1694 if (esp
->erev
== fashme
&& !esp_dev
->wide
) {
1695 if (!SDptr
->borken
&&
1696 SDptr
->type
!= TYPE_ROM
&&
1697 SDptr
->removable
== 0) {
1698 build_wide_nego_msg(esp
, 16);
1701 goto after_nego_msg_built
;
1704 /* Fall through and try sync. */
1708 if (!SDptr
->borken
) {
1709 if ((SDptr
->type
== TYPE_ROM
)) {
1710 /* Nice try sucker... */
1711 ESPMISC(("esp%d: Disabling sync for buggy "
1712 "CDROM.\n", esp
->esp_id
));
1713 cdrom_hwbug_wkaround
= 1;
1714 build_sync_nego_msg(esp
, 0, 0);
1715 } else if (SDptr
->removable
!= 0) {
1716 ESPMISC(("esp%d: Not negotiating sync/wide but "
1717 "allowing disconnect for removable media.\n",
1719 build_sync_nego_msg(esp
, 0, 0);
1721 build_sync_nego_msg(esp
, esp
->sync_defp
, 15);
1724 build_sync_nego_msg(esp
, 0, 0);
1729 after_nego_msg_built
:
1730 /* A fix for broken SCSI1 targets, when they disconnect
1731 * they lock up the bus and confuse ESP. So disallow
1732 * disconnects for SCSI1 targets for now until we
1733 * find a better fix.
1735 * Addendum: This is funny, I figured out what was going
1736 * on. The blotzed SCSI1 target would disconnect,
1737 * one of the other SCSI2 targets or both would be
1738 * disconnected as well. The SCSI1 target would
1739 * stay disconnected long enough that we start
1740 * up a command on one of the SCSI2 targets. As
1741 * the ESP is arbitrating for the bus the SCSI1
1742 * target begins to arbitrate as well to reselect
1743 * the ESP. The SCSI1 target refuses to drop it's
1744 * ID bit on the data bus even though the ESP is
1745 * at ID 7 and is the obvious winner for any
1746 * arbitration. The ESP is a poor sport and refuses
1747 * to lose arbitration, it will continue indefinitely
1748 * trying to arbitrate for the bus and can only be
1749 * stopped via a chip reset or SCSI bus reset.
1750 * Therefore _no_ disconnects for SCSI1 targets
1751 * thank you very much. ;-)
1753 if(((SDptr
->scsi_level
< 3) &&
1754 (SDptr
->type
!= TYPE_TAPE
) &&
1755 SDptr
->removable
== 0) ||
1756 cdrom_hwbug_wkaround
|| SDptr
->borken
) {
1757 ESPMISC((KERN_INFO
"esp%d: Disabling DISCONNECT for target %d "
1758 "lun %d\n", esp
->esp_id
, SCptr
->device
->id
, SCptr
->device
->lun
));
1759 esp_dev
->disconnect
= 0;
1760 *cmdp
++ = IDENTIFY(0, lun
);
1762 *cmdp
++ = IDENTIFY(1, lun
);
1765 /* ESP fifo is only so big...
1766 * Make this look like a slow command.
1768 esp
->esp_slowcmd
= 1;
1769 esp
->esp_scmdleft
= SCptr
->cmd_len
;
1770 esp
->esp_scmdp
= &SCptr
->cmnd
[0];
1772 the_esp_command
= (ESP_CMD_SELAS
| ESP_CMD_DMA
);
1773 esp_advance_phase(SCptr
, in_slct_msg
);
1776 if (!esp
->esp_slowcmd
)
1777 for (i
= 0; i
< SCptr
->cmd_len
; i
++)
1778 *cmdp
++ = SCptr
->cmnd
[i
];
1781 if (esp
->erev
== fashme
)
1782 sbus_writeb((target
& 0xf) | (ESP_BUSID_RESELID
| ESP_BUSID_CTR32BIT
),
1783 esp
->eregs
+ ESP_BUSID
);
1785 sbus_writeb(target
& 7, esp
->eregs
+ ESP_BUSID
);
1786 if (esp
->prev_soff
!= esp_dev
->sync_max_offset
||
1787 esp
->prev_stp
!= esp_dev
->sync_min_period
||
1788 (esp
->erev
> esp100a
&&
1789 esp
->prev_cfg3
!= esp
->config3
[target
])) {
1790 esp
->prev_soff
= esp_dev
->sync_max_offset
;
1791 esp
->prev_stp
= esp_dev
->sync_min_period
;
1792 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
1793 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
1794 if (esp
->erev
> esp100a
) {
1795 esp
->prev_cfg3
= esp
->config3
[target
];
1796 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
1799 i
= (cmdp
- esp
->esp_command
);
1801 if (esp
->erev
== fashme
) {
1802 esp_cmd(esp
, ESP_CMD_FLUSH
); /* Grrr! */
1804 /* Set up the DMA and HME counters */
1805 sbus_writeb(i
, esp
->eregs
+ ESP_TCLOW
);
1806 sbus_writeb(0, esp
->eregs
+ ESP_TCMED
);
1807 sbus_writeb(0, esp
->eregs
+ FAS_RLO
);
1808 sbus_writeb(0, esp
->eregs
+ FAS_RHI
);
1809 esp_cmd(esp
, the_esp_command
);
1811 /* Talk about touchy hardware... */
1812 esp
->prev_hme_dmacsr
= ((esp
->prev_hme_dmacsr
|
1813 (DMA_SCSI_DISAB
| DMA_ENABLE
)) &
1815 sbus_writel(16, esp
->dregs
+ DMA_COUNT
);
1816 sbus_writel(esp
->esp_command_dvma
, esp
->dregs
+ DMA_ADDR
);
1817 sbus_writel(esp
->prev_hme_dmacsr
, esp
->dregs
+ DMA_CSR
);
1821 /* Set up the DMA and ESP counters */
1822 sbus_writeb(i
, esp
->eregs
+ ESP_TCLOW
);
1823 sbus_writeb(0, esp
->eregs
+ ESP_TCMED
);
1824 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
1825 tmp
&= ~DMA_ST_WRITE
;
1827 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
1828 if (esp
->dma
->revision
== dvmaesc1
) {
1829 if (i
) /* Workaround ESC gate array SBUS rerun bug. */
1830 sbus_writel(PAGE_SIZE
, esp
->dregs
+ DMA_COUNT
);
1832 sbus_writel(esp
->esp_command_dvma
, esp
->dregs
+ DMA_ADDR
);
1834 /* Tell ESP to "go". */
1835 esp_cmd(esp
, the_esp_command
);
1839 /* Queue a SCSI command delivered from the mid-level Linux SCSI code. */
1840 static int esp_queue(struct scsi_cmnd
*SCpnt
, void (*done
)(struct scsi_cmnd
*))
1844 /* Set up func ptr and initial driver cmd-phase. */
1845 SCpnt
->scsi_done
= done
;
1846 SCpnt
->SCp
.phase
= not_issued
;
1848 /* We use the scratch area. */
1849 ESPQUEUE(("esp_queue: target=%d lun=%d ", SCpnt
->device
->id
, SCpnt
->device
->lun
));
1850 ESPDISC(("N<%02x,%02x>", SCpnt
->device
->id
, SCpnt
->device
->lun
));
1852 esp
= (struct esp
*) SCpnt
->device
->host
->hostdata
;
1853 esp_get_dmabufs(esp
, SCpnt
);
1854 esp_save_pointers(esp
, SCpnt
); /* FIXME for tag queueing */
1856 SCpnt
->SCp
.Status
= CHECK_CONDITION
;
1857 SCpnt
->SCp
.Message
= 0xff;
1858 SCpnt
->SCp
.sent_command
= 0;
1860 /* Place into our queue. */
1861 if (SCpnt
->cmnd
[0] == REQUEST_SENSE
) {
1862 ESPQUEUE(("RQSENSE\n"));
1863 prepend_SC(&esp
->issue_SC
, SCpnt
);
1866 append_SC(&esp
->issue_SC
, SCpnt
);
1869 /* Run it now if we can. */
1870 if (!esp
->current_SC
&& !esp
->resetting_bus
)
1876 /* Dump driver state. */
1877 static void esp_dump_cmd(struct scsi_cmnd
*SCptr
)
1879 ESPLOG(("[tgt<%02x> lun<%02x> "
1880 "pphase<%s> cphase<%s>]",
1881 SCptr
->device
->id
, SCptr
->device
->lun
,
1882 phase_string(SCptr
->SCp
.sent_command
),
1883 phase_string(SCptr
->SCp
.phase
)));
1886 static void esp_dump_state(struct esp
*esp
)
1888 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
1889 #ifdef DEBUG_ESP_CMDS
1893 ESPLOG(("esp%d: dumping state\n", esp
->esp_id
));
1894 ESPLOG(("esp%d: dma -- cond_reg<%08x> addr<%08x>\n",
1896 sbus_readl(esp
->dregs
+ DMA_CSR
),
1897 sbus_readl(esp
->dregs
+ DMA_ADDR
)));
1898 ESPLOG(("esp%d: SW [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
1899 esp
->esp_id
, esp
->sreg
, esp
->seqreg
, esp
->ireg
));
1900 ESPLOG(("esp%d: HW reread [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
1902 sbus_readb(esp
->eregs
+ ESP_STATUS
),
1903 sbus_readb(esp
->eregs
+ ESP_SSTEP
),
1904 sbus_readb(esp
->eregs
+ ESP_INTRPT
)));
1905 #ifdef DEBUG_ESP_CMDS
1906 printk("esp%d: last ESP cmds [", esp
->esp_id
);
1907 i
= (esp
->espcmdent
- 1) & 31;
1908 printk("<"); esp_print_cmd(esp
->espcmdlog
[i
]); printk(">");
1910 printk("<"); esp_print_cmd(esp
->espcmdlog
[i
]); printk(">");
1912 printk("<"); esp_print_cmd(esp
->espcmdlog
[i
]); printk(">");
1914 printk("<"); esp_print_cmd(esp
->espcmdlog
[i
]); printk(">");
1916 #endif /* (DEBUG_ESP_CMDS) */
1919 ESPLOG(("esp%d: current command ", esp
->esp_id
));
1920 esp_dump_cmd(SCptr
);
1923 SCptr
= esp
->disconnected_SC
;
1924 ESPLOG(("esp%d: disconnected ", esp
->esp_id
));
1926 esp_dump_cmd(SCptr
);
1927 SCptr
= (struct scsi_cmnd
*) SCptr
->host_scribble
;
1932 /* Abort a command. The host_lock is acquired by caller. */
1933 static int esp_abort(struct scsi_cmnd
*SCptr
)
1935 struct esp
*esp
= (struct esp
*) SCptr
->device
->host
->hostdata
;
1938 ESPLOG(("esp%d: Aborting command\n", esp
->esp_id
));
1939 esp_dump_state(esp
);
1941 /* Wheee, if this is the current command on the bus, the
1942 * best we can do is assert ATN and wait for msgout phase.
1943 * This should even fix a hung SCSI bus when we lose state
1944 * in the driver and timeout because the eventual phase change
1945 * will cause the ESP to (eventually) give an interrupt.
1947 if (esp
->current_SC
== SCptr
) {
1948 esp
->cur_msgout
[0] = ABORT
;
1949 esp
->msgout_len
= 1;
1950 esp
->msgout_ctr
= 0;
1951 esp_cmd(esp
, ESP_CMD_SATN
);
1955 /* If it is still in the issue queue then we can safely
1956 * call the completion routine and report abort success.
1958 don
= (sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_INT_ENAB
);
1960 ESP_INTSOFF(esp
->dregs
);
1962 if (esp
->issue_SC
) {
1963 struct scsi_cmnd
**prev
, *this;
1964 for (prev
= (&esp
->issue_SC
), this = esp
->issue_SC
;
1966 prev
= (struct scsi_cmnd
**) &(this->host_scribble
),
1967 this = (struct scsi_cmnd
*) this->host_scribble
) {
1969 if (this == SCptr
) {
1970 *prev
= (struct scsi_cmnd
*) this->host_scribble
;
1971 this->host_scribble
= NULL
;
1973 esp_release_dmabufs(esp
, this);
1974 this->result
= DID_ABORT
<< 16;
1975 this->scsi_done(this);
1978 ESP_INTSON(esp
->dregs
);
1985 /* Yuck, the command to abort is disconnected, it is not
1986 * worth trying to abort it now if something else is live
1987 * on the bus at this time. So, we let the SCSI code wait
1988 * a little bit and try again later.
1990 if (esp
->current_SC
) {
1992 ESP_INTSON(esp
->dregs
);
1996 /* It's disconnected, we have to reconnect to re-establish
1997 * the nexus and tell the device to abort. However, we really
1998 * cannot 'reconnect' per se. Don't try to be fancy, just
1999 * indicate failure, which causes our caller to reset the whole
2004 ESP_INTSON(esp
->dregs
);
2009 /* We've sent ESP_CMD_RS to the ESP, the interrupt had just
2010 * arrived indicating the end of the SCSI bus reset. Our job
2011 * is to clean out the command queues and begin re-execution
2012 * of SCSI commands once more.
2014 static int esp_finish_reset(struct esp
*esp
)
2016 struct scsi_cmnd
*sp
= esp
->current_SC
;
2018 /* Clean up currently executing command, if any. */
2020 esp
->current_SC
= NULL
;
2022 esp_release_dmabufs(esp
, sp
);
2023 sp
->result
= (DID_RESET
<< 16);
2028 /* Clean up disconnected queue, they have been invalidated
2031 if (esp
->disconnected_SC
) {
2032 while ((sp
= remove_first_SC(&esp
->disconnected_SC
)) != NULL
) {
2033 esp_release_dmabufs(esp
, sp
);
2034 sp
->result
= (DID_RESET
<< 16);
2040 /* SCSI bus reset is complete. */
2041 esp
->resetting_bus
= 0;
2042 wake_up(&esp
->reset_queue
);
2044 /* Ok, now it is safe to get commands going once more. */
2051 static int esp_do_resetbus(struct esp
*esp
)
2053 ESPLOG(("esp%d: Resetting scsi bus\n", esp
->esp_id
));
2054 esp
->resetting_bus
= 1;
2055 esp_cmd(esp
, ESP_CMD_RS
);
2060 /* Reset ESP chip, reset hanging bus, then kill active and
2061 * disconnected commands for targets without soft reset.
2063 * The host_lock is acquired by caller.
2065 static int esp_reset(struct scsi_cmnd
*SCptr
)
2067 struct esp
*esp
= (struct esp
*) SCptr
->device
->host
->hostdata
;
2069 (void) esp_do_resetbus(esp
);
2071 spin_unlock_irq(esp
->ehost
->host_lock
);
2073 wait_event(esp
->reset_queue
, (esp
->resetting_bus
== 0));
2075 spin_lock_irq(esp
->ehost
->host_lock
);
2080 /* Internal ESP done function. */
2081 static void esp_done(struct esp
*esp
, int error
)
2083 struct scsi_cmnd
*done_SC
= esp
->current_SC
;
2085 esp
->current_SC
= NULL
;
2087 esp_release_dmabufs(esp
, done_SC
);
2088 done_SC
->result
= error
;
2090 done_SC
->scsi_done(done_SC
);
2092 /* Bus is free, issue any commands in the queue. */
2093 if (esp
->issue_SC
&& !esp
->current_SC
)
2098 /* Wheee, ESP interrupt engine. */
2100 /* Forward declarations. */
2101 static int esp_do_phase_determine(struct esp
*esp
);
2102 static int esp_do_data_finale(struct esp
*esp
);
2103 static int esp_select_complete(struct esp
*esp
);
2104 static int esp_do_status(struct esp
*esp
);
2105 static int esp_do_msgin(struct esp
*esp
);
2106 static int esp_do_msgindone(struct esp
*esp
);
2107 static int esp_do_msgout(struct esp
*esp
);
2108 static int esp_do_cmdbegin(struct esp
*esp
);
2110 #define sreg_datainp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DIP)
2111 #define sreg_dataoutp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DOP)
2113 /* Read any bytes found in the FAS366 fifo, storing them into
2114 * the ESP driver software state structure.
2116 static void hme_fifo_read(struct esp
*esp
)
2119 u8 status
= esp
->sreg
;
2121 /* Cannot safely frob the fifo for these following cases, but
2122 * we must always read the fifo when the reselect interrupt
2125 if (((esp
->ireg
& ESP_INTR_RSEL
) == 0) &&
2126 (sreg_datainp(status
) ||
2127 sreg_dataoutp(status
) ||
2129 esp
->current_SC
->SCp
.phase
== in_data_done
))) {
2130 ESPHME(("<wkaround_skipped>"));
2132 unsigned long fcnt
= sbus_readb(esp
->eregs
+ ESP_FFLAGS
) & ESP_FF_FBYTES
;
2134 /* The HME stores bytes in multiples of 2 in the fifo. */
2135 ESPHME(("hme_fifo[fcnt=%d", (int)fcnt
));
2137 esp
->hme_fifo_workaround_buffer
[count
++] =
2138 sbus_readb(esp
->eregs
+ ESP_FDATA
);
2139 esp
->hme_fifo_workaround_buffer
[count
++] =
2140 sbus_readb(esp
->eregs
+ ESP_FDATA
);
2141 ESPHME(("<%02x,%02x>", esp
->hme_fifo_workaround_buffer
[count
-2], esp
->hme_fifo_workaround_buffer
[count
-1]));
2144 if (sbus_readb(esp
->eregs
+ ESP_STATUS2
) & ESP_STAT2_F1BYTE
) {
2145 ESPHME(("<poke_byte>"));
2146 sbus_writeb(0, esp
->eregs
+ ESP_FDATA
);
2147 esp
->hme_fifo_workaround_buffer
[count
++] =
2148 sbus_readb(esp
->eregs
+ ESP_FDATA
);
2149 ESPHME(("<%02x,0x00>", esp
->hme_fifo_workaround_buffer
[count
-1]));
2150 ESPHME(("CMD_FLUSH"));
2151 esp_cmd(esp
, ESP_CMD_FLUSH
);
2153 ESPHME(("no_xtra_byte"));
2156 ESPHME(("wkarnd_cnt=%d]", (int)count
));
2157 esp
->hme_fifo_workaround_count
= count
;
2160 static inline void hme_fifo_push(struct esp
*esp
, u8
*bytes
, u8 count
)
2162 esp_cmd(esp
, ESP_CMD_FLUSH
);
2165 sbus_writeb(tmp
, esp
->eregs
+ ESP_FDATA
);
2166 sbus_writeb(0, esp
->eregs
+ ESP_FDATA
);
2171 /* We try to avoid some interrupts by jumping ahead and see if the ESP
2172 * has gotten far enough yet. Hence the following.
2174 static inline int skipahead1(struct esp
*esp
, struct scsi_cmnd
*scp
,
2175 int prev_phase
, int new_phase
)
2177 if (scp
->SCp
.sent_command
!= prev_phase
)
2179 if (ESP_IRQ_P(esp
->dregs
)) {
2180 /* Yes, we are able to save an interrupt. */
2181 if (esp
->erev
== fashme
)
2182 esp
->sreg2
= sbus_readb(esp
->eregs
+ ESP_STATUS2
);
2183 esp
->sreg
= (sbus_readb(esp
->eregs
+ ESP_STATUS
) & ~(ESP_STAT_INTR
));
2184 esp
->ireg
= sbus_readb(esp
->eregs
+ ESP_INTRPT
);
2185 if (esp
->erev
== fashme
) {
2186 /* This chip is really losing. */
2188 /* Must latch fifo before reading the interrupt
2189 * register else garbage ends up in the FIFO
2190 * which confuses the driver utterly.
2191 * Happy Meal indeed....
2193 ESPHME(("fifo_workaround]"));
2194 if (!(esp
->sreg2
& ESP_STAT2_FEMPTY
) ||
2195 (esp
->sreg2
& ESP_STAT2_F1BYTE
))
2198 if (!(esp
->ireg
& ESP_INTR_SR
))
2201 return do_reset_complete
;
2203 /* Ho hum, target is taking forever... */
2204 scp
->SCp
.sent_command
= new_phase
; /* so we don't recurse... */
2208 static inline int skipahead2(struct esp
*esp
, struct scsi_cmnd
*scp
,
2209 int prev_phase1
, int prev_phase2
, int new_phase
)
2211 if (scp
->SCp
.sent_command
!= prev_phase1
&&
2212 scp
->SCp
.sent_command
!= prev_phase2
)
2214 if (ESP_IRQ_P(esp
->dregs
)) {
2215 /* Yes, we are able to save an interrupt. */
2216 if (esp
->erev
== fashme
)
2217 esp
->sreg2
= sbus_readb(esp
->eregs
+ ESP_STATUS2
);
2218 esp
->sreg
= (sbus_readb(esp
->eregs
+ ESP_STATUS
) & ~(ESP_STAT_INTR
));
2219 esp
->ireg
= sbus_readb(esp
->eregs
+ ESP_INTRPT
);
2220 if (esp
->erev
== fashme
) {
2221 /* This chip is really losing. */
2224 /* Must latch fifo before reading the interrupt
2225 * register else garbage ends up in the FIFO
2226 * which confuses the driver utterly.
2227 * Happy Meal indeed....
2229 ESPHME(("fifo_workaround]"));
2230 if (!(esp
->sreg2
& ESP_STAT2_FEMPTY
) ||
2231 (esp
->sreg2
& ESP_STAT2_F1BYTE
))
2234 if (!(esp
->ireg
& ESP_INTR_SR
))
2237 return do_reset_complete
;
2239 /* Ho hum, target is taking forever... */
2240 scp
->SCp
.sent_command
= new_phase
; /* so we don't recurse... */
2244 /* Now some dma helpers. */
2245 static void dma_setup(struct esp
*esp
, __u32 addr
, int count
, int write
)
2247 u32 nreg
= sbus_readl(esp
->dregs
+ DMA_CSR
);
2250 nreg
|= DMA_ST_WRITE
;
2252 nreg
&= ~(DMA_ST_WRITE
);
2254 sbus_writel(nreg
, esp
->dregs
+ DMA_CSR
);
2255 if (esp
->dma
->revision
== dvmaesc1
) {
2256 /* This ESC gate array sucks! */
2258 __u32 dest
= src
+ count
;
2260 if (dest
& (PAGE_SIZE
- 1))
2261 count
= PAGE_ALIGN(count
);
2262 sbus_writel(count
, esp
->dregs
+ DMA_COUNT
);
2264 sbus_writel(addr
, esp
->dregs
+ DMA_ADDR
);
2267 static void dma_drain(struct esp
*esp
)
2271 if (esp
->dma
->revision
== dvmahme
)
2273 if ((tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
)) & DMA_FIFO_ISDRAIN
) {
2274 switch (esp
->dma
->revision
) {
2276 tmp
|= DMA_FIFO_STDRAIN
;
2277 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
2281 while (sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_FIFO_ISDRAIN
)
2287 static void dma_invalidate(struct esp
*esp
)
2291 if (esp
->dma
->revision
== dvmahme
) {
2292 sbus_writel(DMA_RST_SCSI
, esp
->dregs
+ DMA_CSR
);
2294 esp
->prev_hme_dmacsr
= ((esp
->prev_hme_dmacsr
|
2295 (DMA_PARITY_OFF
| DMA_2CLKS
|
2296 DMA_SCSI_DISAB
| DMA_INT_ENAB
)) &
2297 ~(DMA_ST_WRITE
| DMA_ENABLE
));
2299 sbus_writel(0, esp
->dregs
+ DMA_CSR
);
2300 sbus_writel(esp
->prev_hme_dmacsr
, esp
->dregs
+ DMA_CSR
);
2302 /* This is necessary to avoid having the SCSI channel
2303 * engine lock up on us.
2305 sbus_writel(0, esp
->dregs
+ DMA_ADDR
);
2307 while ((tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
)) & DMA_PEND_READ
)
2310 tmp
&= ~(DMA_ENABLE
| DMA_ST_WRITE
| DMA_BCNT_ENAB
);
2311 tmp
|= DMA_FIFO_INV
;
2312 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
2313 tmp
&= ~DMA_FIFO_INV
;
2314 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
2318 static inline void dma_flashclear(struct esp
*esp
)
2321 dma_invalidate(esp
);
2324 static int dma_can_transfer(struct esp
*esp
, struct scsi_cmnd
*sp
)
2326 __u32 base
, end
, sz
;
2328 if (esp
->dma
->revision
== dvmarev3
) {
2329 sz
= sp
->SCp
.this_residual
;
2333 base
= ((__u32
)((unsigned long)sp
->SCp
.ptr
));
2334 base
&= (0x1000000 - 1);
2335 end
= (base
+ sp
->SCp
.this_residual
);
2336 if (end
> 0x1000000)
2343 /* Misc. esp helper macros. */
2344 #define esp_setcount(__eregs, __cnt, __hme) \
2345 sbus_writeb(((__cnt)&0xff), (__eregs) + ESP_TCLOW); \
2346 sbus_writeb((((__cnt)>>8)&0xff), (__eregs) + ESP_TCMED); \
2348 sbus_writeb((((__cnt)>>16)&0xff), (__eregs) + FAS_RLO); \
2349 sbus_writeb(0, (__eregs) + FAS_RHI); \
2352 #define esp_getcount(__eregs, __hme) \
2353 ((sbus_readb((__eregs) + ESP_TCLOW)&0xff) | \
2354 ((sbus_readb((__eregs) + ESP_TCMED)&0xff) << 8) | \
2355 ((__hme) ? sbus_readb((__eregs) + FAS_RLO) << 16 : 0))
2357 #define fcount(__esp) \
2358 (((__esp)->erev == fashme) ? \
2359 (__esp)->hme_fifo_workaround_count : \
2360 sbus_readb(((__esp)->eregs) + ESP_FFLAGS) & ESP_FF_FBYTES)
2362 #define fnzero(__esp) \
2363 (((__esp)->erev == fashme) ? 0 : \
2364 sbus_readb(((__esp)->eregs) + ESP_FFLAGS) & ESP_FF_ONOTZERO)
2366 /* XXX speculative nops unnecessary when continuing amidst a data phase
2367 * XXX even on esp100!!! another case of flooding the bus with I/O reg
2370 #define esp_maybe_nop(__esp) \
2371 if ((__esp)->erev == esp100) \
2372 esp_cmd((__esp), ESP_CMD_NULL)
2374 #define sreg_to_dataphase(__sreg) \
2375 ((((__sreg) & ESP_STAT_PMASK) == ESP_DOP) ? in_dataout : in_datain)
2377 /* The ESP100 when in synchronous data phase, can mistake a long final
2378 * REQ pulse from the target as an extra byte, it places whatever is on
2379 * the data lines into the fifo. For now, we will assume when this
2380 * happens that the target is a bit quirky and we don't want to
2381 * be talking synchronously to it anyways. Regardless, we need to
2382 * tell the ESP to eat the extraneous byte so that we can proceed
2383 * to the next phase.
2385 static int esp100_sync_hwbug(struct esp
*esp
, struct scsi_cmnd
*sp
, int fifocnt
)
2387 /* Do not touch this piece of code. */
2388 if ((!(esp
->erev
== esp100
)) ||
2389 (!(sreg_datainp((esp
->sreg
= sbus_readb(esp
->eregs
+ ESP_STATUS
))) &&
2391 !(sreg_dataoutp(esp
->sreg
) && !fnzero(esp
)))) {
2392 if (sp
->SCp
.phase
== in_dataout
)
2393 esp_cmd(esp
, ESP_CMD_FLUSH
);
2396 /* Async mode for this guy. */
2397 build_sync_nego_msg(esp
, 0, 0);
2399 /* Ack the bogus byte, but set ATN first. */
2400 esp_cmd(esp
, ESP_CMD_SATN
);
2401 esp_cmd(esp
, ESP_CMD_MOK
);
2406 /* This closes the window during a selection with a reselect pending, because
2407 * we use DMA for the selection process the FIFO should hold the correct
2408 * contents if we get reselected during this process. So we just need to
2409 * ack the possible illegal cmd interrupt pending on the esp100.
2411 static inline int esp100_reconnect_hwbug(struct esp
*esp
)
2415 if (esp
->erev
!= esp100
)
2417 tmp
= sbus_readb(esp
->eregs
+ ESP_INTRPT
);
2418 if (tmp
& ESP_INTR_SR
)
2423 /* This verifies the BUSID bits during a reselection so that we know which
2424 * target is talking to us.
2426 static inline int reconnect_target(struct esp
*esp
)
2428 int it
, me
= esp
->scsi_id_mask
, targ
= 0;
2430 if (2 != fcount(esp
))
2432 if (esp
->erev
== fashme
) {
2433 /* HME does not latch it's own BUS ID bits during
2434 * a reselection. Also the target number is given
2435 * as an unsigned char, not as a sole bit number
2436 * like the other ESP's do.
2437 * Happy Meal indeed....
2439 targ
= esp
->hme_fifo_workaround_buffer
[0];
2441 it
= sbus_readb(esp
->eregs
+ ESP_FDATA
);
2453 /* This verifies the identify from the target so that we know which lun is
2454 * being reconnected.
2456 static inline int reconnect_lun(struct esp
*esp
)
2460 if ((esp
->sreg
& ESP_STAT_PMASK
) != ESP_MIP
)
2462 if (esp
->erev
== fashme
)
2463 lun
= esp
->hme_fifo_workaround_buffer
[1];
2465 lun
= sbus_readb(esp
->eregs
+ ESP_FDATA
);
2467 /* Yes, you read this correctly. We report lun of zero
2468 * if we see parity error. ESP reports parity error for
2469 * the lun byte, and this is the only way to hope to recover
2470 * because the target is connected.
2472 if (esp
->sreg
& ESP_STAT_PERR
)
2475 /* Check for illegal bits being set in the lun. */
2476 if ((lun
& 0x40) || !(lun
& 0x80))
2482 /* This puts the driver in a state where it can revitalize a command that
2483 * is being continued due to reselection.
2485 static inline void esp_connect(struct esp
*esp
, struct scsi_cmnd
*sp
)
2487 struct esp_device
*esp_dev
= sp
->device
->hostdata
;
2489 if (esp
->prev_soff
!= esp_dev
->sync_max_offset
||
2490 esp
->prev_stp
!= esp_dev
->sync_min_period
||
2491 (esp
->erev
> esp100a
&&
2492 esp
->prev_cfg3
!= esp
->config3
[sp
->device
->id
])) {
2493 esp
->prev_soff
= esp_dev
->sync_max_offset
;
2494 esp
->prev_stp
= esp_dev
->sync_min_period
;
2495 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
2496 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
2497 if (esp
->erev
> esp100a
) {
2498 esp
->prev_cfg3
= esp
->config3
[sp
->device
->id
];
2499 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
2502 esp
->current_SC
= sp
;
2505 /* This will place the current working command back into the issue queue
2506 * if we are to receive a reselection amidst a selection attempt.
2508 static inline void esp_reconnect(struct esp
*esp
, struct scsi_cmnd
*sp
)
2510 if (!esp
->disconnected_SC
)
2511 ESPLOG(("esp%d: Weird, being reselected but disconnected "
2512 "command queue is empty.\n", esp
->esp_id
));
2514 esp
->current_SC
= 0;
2515 sp
->SCp
.phase
= not_issued
;
2516 append_SC(&esp
->issue_SC
, sp
);
2519 /* Begin message in phase. */
2520 static int esp_do_msgin(struct esp
*esp
)
2522 /* Must be very careful with the fifo on the HME */
2523 if ((esp
->erev
!= fashme
) ||
2524 !(sbus_readb(esp
->eregs
+ ESP_STATUS2
) & ESP_STAT2_FEMPTY
))
2525 esp_cmd(esp
, ESP_CMD_FLUSH
);
2527 esp_cmd(esp
, ESP_CMD_TI
);
2530 esp_advance_phase(esp
->current_SC
, in_msgindone
);
2534 /* This uses various DMA csr fields and the fifo flags count value to
2535 * determine how many bytes were successfully sent/received by the ESP.
2537 static inline int esp_bytes_sent(struct esp
*esp
, int fifo_count
)
2539 int rval
= sbus_readl(esp
->dregs
+ DMA_ADDR
) - esp
->esp_command_dvma
;
2541 if (esp
->dma
->revision
== dvmarev1
)
2542 rval
-= (4 - ((sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_READ_AHEAD
)>>11));
2543 return rval
- fifo_count
;
2546 static inline void advance_sg(struct scsi_cmnd
*sp
)
2549 --sp
->SCp
.buffers_residual
;
2550 sp
->SCp
.this_residual
= sg_dma_len(sp
->SCp
.buffer
);
2551 sp
->SCp
.ptr
= (char *)((unsigned long)sg_dma_address(sp
->SCp
.buffer
));
2554 /* Please note that the way I've coded these routines is that I _always_
2555 * check for a disconnect during any and all information transfer
2556 * phases. The SCSI standard states that the target _can_ cause a BUS
2557 * FREE condition by dropping all MSG/CD/IO/BSY signals. Also note
2558 * that during information transfer phases the target controls every
2559 * change in phase, the only thing the initiator can do is "ask" for
2560 * a message out phase by driving ATN true. The target can, and sometimes
2561 * will, completely ignore this request so we cannot assume anything when
2562 * we try to force a message out phase to abort/reset a target. Most of
2563 * the time the target will eventually be nice and go to message out, so
2564 * we may have to hold on to our state about what we want to tell the target
2565 * for some period of time.
2568 /* I think I have things working here correctly. Even partial transfers
2569 * within a buffer or sub-buffer should not upset us at all no matter
2570 * how bad the target and/or ESP fucks things up.
2572 static int esp_do_data(struct esp
*esp
)
2574 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
2575 int thisphase
, hmuch
;
2577 ESPDATA(("esp_do_data: "));
2579 thisphase
= sreg_to_dataphase(esp
->sreg
);
2580 esp_advance_phase(SCptr
, thisphase
);
2581 ESPDATA(("newphase<%s> ", (thisphase
== in_datain
) ? "DATAIN" : "DATAOUT"));
2582 hmuch
= dma_can_transfer(esp
, SCptr
);
2583 if (hmuch
> (64 * 1024) && (esp
->erev
!= fashme
))
2584 hmuch
= (64 * 1024);
2585 ESPDATA(("hmuch<%d> ", hmuch
));
2586 esp
->current_transfer_size
= hmuch
;
2588 if (esp
->erev
== fashme
) {
2589 u32 tmp
= esp
->prev_hme_dmacsr
;
2591 /* Always set the ESP count registers first. */
2592 esp_setcount(esp
->eregs
, hmuch
, 1);
2594 /* Get the DMA csr computed. */
2595 tmp
|= (DMA_SCSI_DISAB
| DMA_ENABLE
);
2596 if (thisphase
== in_datain
)
2597 tmp
|= DMA_ST_WRITE
;
2599 tmp
&= ~(DMA_ST_WRITE
);
2600 esp
->prev_hme_dmacsr
= tmp
;
2602 ESPDATA(("DMA|TI --> do_intr_end\n"));
2603 if (thisphase
== in_datain
) {
2604 sbus_writel(hmuch
, esp
->dregs
+ DMA_COUNT
);
2605 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
2607 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
2608 sbus_writel(hmuch
, esp
->dregs
+ DMA_COUNT
);
2610 sbus_writel((__u32
)((unsigned long)SCptr
->SCp
.ptr
), esp
->dregs
+DMA_ADDR
);
2611 sbus_writel(esp
->prev_hme_dmacsr
, esp
->dregs
+ DMA_CSR
);
2613 esp_setcount(esp
->eregs
, hmuch
, 0);
2614 dma_setup(esp
, ((__u32
)((unsigned long)SCptr
->SCp
.ptr
)),
2615 hmuch
, (thisphase
== in_datain
));
2616 ESPDATA(("DMA|TI --> do_intr_end\n"));
2617 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
2622 /* See how successful the data transfer was. */
2623 static int esp_do_data_finale(struct esp
*esp
)
2625 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
2626 struct esp_device
*esp_dev
= SCptr
->device
->hostdata
;
2627 int bogus_data
= 0, bytes_sent
= 0, fifocnt
, ecount
= 0;
2629 ESPDATA(("esp_do_data_finale: "));
2631 if (SCptr
->SCp
.phase
== in_datain
) {
2632 if (esp
->sreg
& ESP_STAT_PERR
) {
2633 /* Yuck, parity error. The ESP asserts ATN
2634 * so that we can go to message out phase
2635 * immediately and inform the target that
2636 * something bad happened.
2638 ESPLOG(("esp%d: data bad parity detected.\n",
2640 esp
->cur_msgout
[0] = INITIATOR_ERROR
;
2641 esp
->msgout_len
= 1;
2645 dma_invalidate(esp
);
2647 /* This could happen for the above parity error case. */
2648 if (esp
->ireg
!= ESP_INTR_BSERV
) {
2649 /* Please go to msgout phase, please please please... */
2650 ESPLOG(("esp%d: !BSERV after data, probably to msgout\n",
2652 return esp_do_phase_determine(esp
);
2655 /* Check for partial transfers and other horrible events.
2656 * Note, here we read the real fifo flags register even
2657 * on HME broken adapters because we skip the HME fifo
2658 * workaround code in esp_handle() if we are doing data
2659 * phase things. We don't want to fuck directly with
2660 * the fifo like that, especially if doing synchronous
2661 * transfers! Also, will need to double the count on
2662 * HME if we are doing wide transfers, as the HME fifo
2663 * will move and count 16-bit quantities during wide data.
2664 * SMCC _and_ Qlogic can both bite me.
2666 fifocnt
= (sbus_readb(esp
->eregs
+ ESP_FFLAGS
) & ESP_FF_FBYTES
);
2667 if (esp
->erev
!= fashme
)
2668 ecount
= esp_getcount(esp
->eregs
, 0);
2669 bytes_sent
= esp
->current_transfer_size
;
2671 ESPDATA(("trans_sz(%d), ", bytes_sent
));
2672 if (esp
->erev
== fashme
) {
2673 if (!(esp
->sreg
& ESP_STAT_TCNT
)) {
2674 ecount
= esp_getcount(esp
->eregs
, 1);
2675 bytes_sent
-= ecount
;
2678 /* Always subtract any cruft remaining in the FIFO. */
2679 if (esp
->prev_cfg3
& ESP_CONFIG3_EWIDE
)
2681 if (SCptr
->SCp
.phase
== in_dataout
)
2682 bytes_sent
-= fifocnt
;
2684 /* I have an IBM disk which exhibits the following
2685 * behavior during writes to it. It disconnects in
2686 * the middle of a partial transfer, the current sglist
2687 * buffer is 1024 bytes, the disk stops data transfer
2690 * However the FAS366 reports that 32 more bytes were
2691 * transferred than really were. This is precisely
2692 * the size of a fully loaded FIFO in wide scsi mode.
2693 * The FIFO state recorded indicates that it is empty.
2695 * I have no idea if this is a bug in the FAS366 chip
2696 * or a bug in the firmware on this IBM disk. In any
2697 * event the following seems to be a good workaround. -DaveM
2699 if (bytes_sent
!= esp
->current_transfer_size
&&
2700 SCptr
->SCp
.phase
== in_dataout
) {
2701 int mask
= (64 - 1);
2703 if ((esp
->prev_cfg3
& ESP_CONFIG3_EWIDE
) == 0)
2706 if (bytes_sent
& mask
)
2707 bytes_sent
-= (bytes_sent
& mask
);
2710 if (!(esp
->sreg
& ESP_STAT_TCNT
))
2711 bytes_sent
-= ecount
;
2712 if (SCptr
->SCp
.phase
== in_dataout
)
2713 bytes_sent
-= fifocnt
;
2716 ESPDATA(("bytes_sent(%d), ", bytes_sent
));
2718 /* If we were in synchronous mode, check for peculiarities. */
2719 if (esp
->erev
== fashme
) {
2720 if (esp_dev
->sync_max_offset
) {
2721 if (SCptr
->SCp
.phase
== in_dataout
)
2722 esp_cmd(esp
, ESP_CMD_FLUSH
);
2724 esp_cmd(esp
, ESP_CMD_FLUSH
);
2727 if (esp_dev
->sync_max_offset
)
2728 bogus_data
= esp100_sync_hwbug(esp
, SCptr
, fifocnt
);
2730 esp_cmd(esp
, ESP_CMD_FLUSH
);
2733 /* Until we are sure of what has happened, we are certainly
2736 esp_advance_phase(SCptr
, in_the_dark
);
2738 if (bytes_sent
< 0) {
2739 /* I've seen this happen due to lost state in this
2740 * driver. No idea why it happened, but allowing
2741 * this value to be negative caused things to
2742 * lock up. This allows greater chance of recovery.
2743 * In fact every time I've seen this, it has been
2744 * a driver bug without question.
2746 ESPLOG(("esp%d: yieee, bytes_sent < 0!\n", esp
->esp_id
));
2747 ESPLOG(("esp%d: csz=%d fifocount=%d ecount=%d\n",
2749 esp
->current_transfer_size
, fifocnt
, ecount
));
2750 ESPLOG(("esp%d: use_sg=%d ptr=%p this_residual=%d\n",
2752 SCptr
->use_sg
, SCptr
->SCp
.ptr
, SCptr
->SCp
.this_residual
));
2753 ESPLOG(("esp%d: Forcing async for target %d\n", esp
->esp_id
,
2754 SCptr
->device
->id
));
2755 SCptr
->device
->borken
= 1;
2760 /* Update the state of our transfer. */
2761 SCptr
->SCp
.ptr
+= bytes_sent
;
2762 SCptr
->SCp
.this_residual
-= bytes_sent
;
2763 if (SCptr
->SCp
.this_residual
< 0) {
2765 ESPLOG(("esp%d: Data transfer overrun.\n", esp
->esp_id
));
2766 SCptr
->SCp
.this_residual
= 0;
2769 /* Maybe continue. */
2771 ESPDATA(("!bogus_data, "));
2773 /* NO MATTER WHAT, we advance the scatterlist,
2774 * if the target should decide to disconnect
2775 * in between scatter chunks (which is common)
2776 * we could die horribly! I used to have the sg
2777 * advance occur only if we are going back into
2778 * (or are staying in) a data phase, you can
2779 * imagine the hell I went through trying to
2782 if (SCptr
->use_sg
&& !SCptr
->SCp
.this_residual
)
2784 if (sreg_datainp(esp
->sreg
) || sreg_dataoutp(esp
->sreg
)) {
2785 ESPDATA(("to more data\n"));
2786 return esp_do_data(esp
);
2788 ESPDATA(("to new phase\n"));
2789 return esp_do_phase_determine(esp
);
2791 /* Bogus data, just wait for next interrupt. */
2792 ESPLOG(("esp%d: bogus_data during end of data phase\n",
2797 /* We received a non-good status return at the end of
2798 * running a SCSI command. This is used to decide if
2799 * we should clear our synchronous transfer state for
2800 * such a device when that happens.
2802 * The idea is that when spinning up a disk or rewinding
2803 * a tape, we don't want to go into a loop re-negotiating
2804 * synchronous capabilities over and over.
2806 static int esp_should_clear_sync(struct scsi_cmnd
*sp
)
2808 u8 cmd1
= sp
->cmnd
[0];
2809 u8 cmd2
= sp
->data_cmnd
[0];
2811 /* These cases are for spinning up a disk and
2812 * waiting for that spinup to complete.
2814 if (cmd1
== START_STOP
||
2818 if (cmd1
== TEST_UNIT_READY
||
2819 cmd2
== TEST_UNIT_READY
)
2822 /* One more special case for SCSI tape drives,
2823 * this is what is used to probe the device for
2824 * completion of a rewind or tape load operation.
2826 if (sp
->device
->type
== TYPE_TAPE
) {
2827 if (cmd1
== MODE_SENSE
||
2835 /* Either a command is completing or a target is dropping off the bus
2836 * to continue the command in the background so we can do other work.
2838 static int esp_do_freebus(struct esp
*esp
)
2840 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
2841 struct esp_device
*esp_dev
= SCptr
->device
->hostdata
;
2844 rval
= skipahead2(esp
, SCptr
, in_status
, in_msgindone
, in_freeing
);
2847 if (esp
->ireg
!= ESP_INTR_DC
) {
2848 ESPLOG(("esp%d: Target will not disconnect\n", esp
->esp_id
));
2849 return do_reset_bus
; /* target will not drop BSY... */
2851 esp
->msgout_len
= 0;
2852 esp
->prevmsgout
= NOP
;
2853 if (esp
->prevmsgin
== COMMAND_COMPLETE
) {
2854 /* Normal end of nexus. */
2855 if (esp
->disconnected_SC
|| (esp
->erev
== fashme
))
2856 esp_cmd(esp
, ESP_CMD_ESEL
);
2858 if (SCptr
->SCp
.Status
!= GOOD
&&
2859 SCptr
->SCp
.Status
!= CONDITION_GOOD
&&
2860 ((1<<SCptr
->device
->id
) & esp
->targets_present
) &&
2862 esp_dev
->sync_max_offset
) {
2863 /* SCSI standard says that the synchronous capabilities
2864 * should be renegotiated at this point. Most likely
2865 * we are about to request sense from this target
2866 * in which case we want to avoid using sync
2867 * transfers until we are sure of the current target
2870 ESPMISC(("esp: Status <%d> for target %d lun %d\n",
2871 SCptr
->SCp
.Status
, SCptr
->device
->id
, SCptr
->device
->lun
));
2873 /* But don't do this when spinning up a disk at
2874 * boot time while we poll for completion as it
2875 * fills up the console with messages. Also, tapes
2876 * can report not ready many times right after
2877 * loading up a tape.
2879 if (esp_should_clear_sync(SCptr
) != 0)
2882 ESPDISC(("F<%02x,%02x>", SCptr
->device
->id
, SCptr
->device
->lun
));
2883 esp_done(esp
, ((SCptr
->SCp
.Status
& 0xff) |
2884 ((SCptr
->SCp
.Message
& 0xff)<<8) |
2886 } else if (esp
->prevmsgin
== DISCONNECT
) {
2887 /* Normal disconnect. */
2888 esp_cmd(esp
, ESP_CMD_ESEL
);
2889 ESPDISC(("D<%02x,%02x>", SCptr
->device
->id
, SCptr
->device
->lun
));
2890 append_SC(&esp
->disconnected_SC
, SCptr
);
2891 esp
->current_SC
= NULL
;
2895 /* Driver bug, we do not expect a disconnect here
2896 * and should not have advanced the state engine
2899 ESPLOG(("esp%d: last msg not disc and not cmd cmplt.\n",
2901 return do_reset_bus
;
2906 /* When a reselect occurs, and we cannot find the command to
2907 * reconnect to in our queues, we do this.
2909 static int esp_bad_reconnect(struct esp
*esp
)
2911 struct scsi_cmnd
*sp
;
2913 ESPLOG(("esp%d: Eieeee, reconnecting unknown command!\n",
2915 ESPLOG(("QUEUE DUMP\n"));
2917 ESPLOG(("esp%d: issue_SC[", esp
->esp_id
));
2919 ESPLOG(("<%02x,%02x>", sp
->device
->id
, sp
->device
->lun
));
2920 sp
= (struct scsi_cmnd
*) sp
->host_scribble
;
2923 sp
= esp
->current_SC
;
2924 ESPLOG(("esp%d: current_SC[", esp
->esp_id
));
2926 ESPLOG(("<%02x,%02x>", sp
->device
->id
, sp
->device
->lun
));
2930 sp
= esp
->disconnected_SC
;
2931 ESPLOG(("esp%d: disconnected_SC[", esp
->esp_id
));
2933 ESPLOG(("<%02x,%02x>", sp
->device
->id
, sp
->device
->lun
));
2934 sp
= (struct scsi_cmnd
*) sp
->host_scribble
;
2937 return do_reset_bus
;
2940 /* Do the needy when a target tries to reconnect to us. */
2941 static int esp_do_reconnect(struct esp
*esp
)
2944 struct scsi_cmnd
*SCptr
;
2946 /* Check for all bogus conditions first. */
2947 target
= reconnect_target(esp
);
2949 ESPDISC(("bad bus bits\n"));
2950 return do_reset_bus
;
2952 lun
= reconnect_lun(esp
);
2954 ESPDISC(("target=%2x, bad identify msg\n", target
));
2955 return do_reset_bus
;
2958 /* Things look ok... */
2959 ESPDISC(("R<%02x,%02x>", target
, lun
));
2961 /* Must not flush FIFO or DVMA on HME. */
2962 if (esp
->erev
!= fashme
) {
2963 esp_cmd(esp
, ESP_CMD_FLUSH
);
2964 if (esp100_reconnect_hwbug(esp
))
2965 return do_reset_bus
;
2966 esp_cmd(esp
, ESP_CMD_NULL
);
2969 SCptr
= remove_SC(&esp
->disconnected_SC
, (u8
) target
, (u8
) lun
);
2971 return esp_bad_reconnect(esp
);
2973 esp_connect(esp
, SCptr
);
2974 esp_cmd(esp
, ESP_CMD_MOK
);
2976 if (esp
->erev
== fashme
)
2977 sbus_writeb(((SCptr
->device
->id
& 0xf) |
2978 (ESP_BUSID_RESELID
| ESP_BUSID_CTR32BIT
)),
2979 esp
->eregs
+ ESP_BUSID
);
2981 /* Reconnect implies a restore pointers operation. */
2982 esp_restore_pointers(esp
, SCptr
);
2985 esp_advance_phase(SCptr
, in_the_dark
);
2989 /* End of NEXUS (hopefully), pick up status + message byte then leave if
2992 static int esp_do_status(struct esp
*esp
)
2994 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
2997 rval
= skipahead1(esp
, SCptr
, in_the_dark
, in_status
);
3001 ESPSTAT(("esp_do_status: "));
3002 if (intr
!= ESP_INTR_DC
) {
3003 int message_out
= 0; /* for parity problems */
3005 /* Ack the message. */
3006 ESPSTAT(("ack msg, "));
3007 esp_cmd(esp
, ESP_CMD_MOK
);
3009 if (esp
->erev
!= fashme
) {
3010 dma_flashclear(esp
);
3012 /* Wait till the first bits settle. */
3013 while (esp
->esp_command
[0] == 0xff)
3016 esp
->esp_command
[0] = esp
->hme_fifo_workaround_buffer
[0];
3017 esp
->esp_command
[1] = esp
->hme_fifo_workaround_buffer
[1];
3020 ESPSTAT(("got something, "));
3021 /* ESP chimes in with one of
3023 * 1) function done interrupt:
3024 * both status and message in bytes
3027 * 2) bus service interrupt:
3028 * only status byte was acquired
3031 * can't happen, but we test for it
3034 * ALSO: If bad parity was detected on either
3035 * the status _or_ the message byte then
3036 * the ESP has asserted ATN on the bus
3037 * and we must therefore wait for the
3038 * next phase change.
3040 if (intr
& ESP_INTR_FDONE
) {
3041 /* We got it all, hallejulia. */
3042 ESPSTAT(("got both, "));
3043 SCptr
->SCp
.Status
= esp
->esp_command
[0];
3044 SCptr
->SCp
.Message
= esp
->esp_command
[1];
3045 esp
->prevmsgin
= SCptr
->SCp
.Message
;
3046 esp
->cur_msgin
[0] = SCptr
->SCp
.Message
;
3047 if (esp
->sreg
& ESP_STAT_PERR
) {
3048 /* There was bad parity for the
3049 * message byte, the status byte
3052 message_out
= MSG_PARITY_ERROR
;
3054 } else if (intr
== ESP_INTR_BSERV
) {
3055 /* Only got status byte. */
3056 ESPLOG(("esp%d: got status only, ", esp
->esp_id
));
3057 if (!(esp
->sreg
& ESP_STAT_PERR
)) {
3058 SCptr
->SCp
.Status
= esp
->esp_command
[0];
3059 SCptr
->SCp
.Message
= 0xff;
3061 /* The status byte had bad parity.
3062 * we leave the scsi_pointer Status
3063 * field alone as we set it to a default
3064 * of CHECK_CONDITION in esp_queue.
3066 message_out
= INITIATOR_ERROR
;
3069 /* This shouldn't happen ever. */
3070 ESPSTAT(("got bolixed\n"));
3071 esp_advance_phase(SCptr
, in_the_dark
);
3072 return esp_do_phase_determine(esp
);
3076 ESPSTAT(("status=%2x msg=%2x, ", SCptr
->SCp
.Status
,
3077 SCptr
->SCp
.Message
));
3078 if (SCptr
->SCp
.Message
== COMMAND_COMPLETE
) {
3079 ESPSTAT(("and was COMMAND_COMPLETE\n"));
3080 esp_advance_phase(SCptr
, in_freeing
);
3081 return esp_do_freebus(esp
);
3083 ESPLOG(("esp%d: and _not_ COMMAND_COMPLETE\n",
3085 esp
->msgin_len
= esp
->msgin_ctr
= 1;
3086 esp_advance_phase(SCptr
, in_msgindone
);
3087 return esp_do_msgindone(esp
);
3090 /* With luck we'll be able to let the target
3091 * know that bad parity happened, it will know
3092 * which byte caused the problems and send it
3093 * again. For the case where the status byte
3094 * receives bad parity, I do not believe most
3095 * targets recover very well. We'll see.
3097 ESPLOG(("esp%d: bad parity somewhere mout=%2x\n",
3098 esp
->esp_id
, message_out
));
3099 esp
->cur_msgout
[0] = message_out
;
3100 esp
->msgout_len
= esp
->msgout_ctr
= 1;
3101 esp_advance_phase(SCptr
, in_the_dark
);
3102 return esp_do_phase_determine(esp
);
3105 /* If we disconnect now, all hell breaks loose. */
3106 ESPLOG(("esp%d: whoops, disconnect\n", esp
->esp_id
));
3107 esp_advance_phase(SCptr
, in_the_dark
);
3108 return esp_do_phase_determine(esp
);
3112 static int esp_enter_status(struct esp
*esp
)
3114 u8 thecmd
= ESP_CMD_ICCSEQ
;
3116 esp_cmd(esp
, ESP_CMD_FLUSH
);
3117 if (esp
->erev
!= fashme
) {
3120 esp
->esp_command
[0] = esp
->esp_command
[1] = 0xff;
3121 sbus_writeb(2, esp
->eregs
+ ESP_TCLOW
);
3122 sbus_writeb(0, esp
->eregs
+ ESP_TCMED
);
3123 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
3124 tmp
|= (DMA_ST_WRITE
| DMA_ENABLE
);
3125 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
3126 if (esp
->dma
->revision
== dvmaesc1
)
3127 sbus_writel(0x100, esp
->dregs
+ DMA_COUNT
);
3128 sbus_writel(esp
->esp_command_dvma
, esp
->dregs
+ DMA_ADDR
);
3129 thecmd
|= ESP_CMD_DMA
;
3131 esp_cmd(esp
, thecmd
);
3132 esp_advance_phase(esp
->current_SC
, in_status
);
3134 return esp_do_status(esp
);
3137 static int esp_disconnect_amidst_phases(struct esp
*esp
)
3139 struct scsi_cmnd
*sp
= esp
->current_SC
;
3140 struct esp_device
*esp_dev
= sp
->device
->hostdata
;
3142 /* This means real problems if we see this
3143 * here. Unless we were actually trying
3144 * to force the device to abort/reset.
3146 ESPLOG(("esp%d Disconnect amidst phases, ", esp
->esp_id
));
3147 ESPLOG(("pphase<%s> cphase<%s>, ",
3148 phase_string(sp
->SCp
.phase
),
3149 phase_string(sp
->SCp
.sent_command
)));
3151 if (esp
->disconnected_SC
!= NULL
|| (esp
->erev
== fashme
))
3152 esp_cmd(esp
, ESP_CMD_ESEL
);
3154 switch (esp
->cur_msgout
[0]) {
3156 /* We didn't expect this to happen at all. */
3157 ESPLOG(("device is bolixed\n"));
3158 esp_advance_phase(sp
, in_tgterror
);
3159 esp_done(esp
, (DID_ERROR
<< 16));
3162 case BUS_DEVICE_RESET
:
3163 ESPLOG(("device reset successful\n"));
3164 esp_dev
->sync_max_offset
= 0;
3165 esp_dev
->sync_min_period
= 0;
3167 esp_advance_phase(sp
, in_resetdev
);
3168 esp_done(esp
, (DID_RESET
<< 16));
3172 ESPLOG(("device abort successful\n"));
3173 esp_advance_phase(sp
, in_abortone
);
3174 esp_done(esp
, (DID_ABORT
<< 16));
3181 static int esp_enter_msgout(struct esp
*esp
)
3183 esp_advance_phase(esp
->current_SC
, in_msgout
);
3184 return esp_do_msgout(esp
);
3187 static int esp_enter_msgin(struct esp
*esp
)
3189 esp_advance_phase(esp
->current_SC
, in_msgin
);
3190 return esp_do_msgin(esp
);
3193 static int esp_enter_cmd(struct esp
*esp
)
3195 esp_advance_phase(esp
->current_SC
, in_cmdbegin
);
3196 return esp_do_cmdbegin(esp
);
3199 static int esp_enter_badphase(struct esp
*esp
)
3201 ESPLOG(("esp%d: Bizarre bus phase %2x.\n", esp
->esp_id
,
3202 esp
->sreg
& ESP_STAT_PMASK
));
3203 return do_reset_bus
;
3206 typedef int (*espfunc_t
)(struct esp
*);
3208 static espfunc_t phase_vector
[] = {
3209 esp_do_data
, /* ESP_DOP */
3210 esp_do_data
, /* ESP_DIP */
3211 esp_enter_cmd
, /* ESP_CMDP */
3212 esp_enter_status
, /* ESP_STATP */
3213 esp_enter_badphase
, /* ESP_STAT_PMSG */
3214 esp_enter_badphase
, /* ESP_STAT_PMSG | ESP_STAT_PIO */
3215 esp_enter_msgout
, /* ESP_MOP */
3216 esp_enter_msgin
, /* ESP_MIP */
3219 /* The target has control of the bus and we have to see where it has
3222 static int esp_do_phase_determine(struct esp
*esp
)
3224 if ((esp
->ireg
& ESP_INTR_DC
) != 0)
3225 return esp_disconnect_amidst_phases(esp
);
3226 return phase_vector
[esp
->sreg
& ESP_STAT_PMASK
](esp
);
3229 /* First interrupt after exec'ing a cmd comes here. */
3230 static int esp_select_complete(struct esp
*esp
)
3232 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
3233 struct esp_device
*esp_dev
= SCptr
->device
->hostdata
;
3234 int cmd_bytes_sent
, fcnt
;
3236 if (esp
->erev
!= fashme
)
3237 esp
->seqreg
= (sbus_readb(esp
->eregs
+ ESP_SSTEP
) & ESP_STEP_VBITS
);
3239 if (esp
->erev
== fashme
)
3240 fcnt
= esp
->hme_fifo_workaround_count
;
3242 fcnt
= (sbus_readb(esp
->eregs
+ ESP_FFLAGS
) & ESP_FF_FBYTES
);
3244 cmd_bytes_sent
= esp_bytes_sent(esp
, fcnt
);
3245 dma_invalidate(esp
);
3247 /* Let's check to see if a reselect happened
3248 * while we we're trying to select. This must
3251 if (esp
->ireg
== (ESP_INTR_RSEL
| ESP_INTR_FDONE
)) {
3252 esp_reconnect(esp
, SCptr
);
3253 return esp_do_reconnect(esp
);
3256 /* Looks like things worked, we should see a bus service &
3257 * a function complete interrupt at this point. Note we
3258 * are doing a direct comparison because we don't want to
3259 * be fooled into thinking selection was successful if
3260 * ESP_INTR_DC is set, see below.
3262 if (esp
->ireg
== (ESP_INTR_FDONE
| ESP_INTR_BSERV
)) {
3263 /* target speaks... */
3264 esp
->targets_present
|= (1<<SCptr
->device
->id
);
3266 /* What if the target ignores the sdtr? */
3270 /* See how far, if at all, we got in getting
3271 * the information out to the target.
3273 switch (esp
->seqreg
) {
3277 /* Arbitration won, target selected, but
3278 * we are in some phase which is not command
3279 * phase nor is it message out phase.
3281 * XXX We've confused the target, obviously.
3282 * XXX So clear it's state, but we also end
3283 * XXX up clearing everyone elses. That isn't
3284 * XXX so nice. I'd like to just reset this
3285 * XXX target, but if I cannot even get it's
3286 * XXX attention and finish selection to talk
3287 * XXX to it, there is not much more I can do.
3288 * XXX If we have a loaded bus we're going to
3289 * XXX spend the next second or so renegotiating
3290 * XXX for synchronous transfers.
3292 ESPLOG(("esp%d: STEP_ASEL for tgt %d\n",
3293 esp
->esp_id
, SCptr
->device
->id
));
3296 /* Arbitration won, target selected, went
3297 * to message out phase, sent one message
3298 * byte, then we stopped. ATN is asserted
3299 * on the SCSI bus and the target is still
3300 * there hanging on. This is a legal
3301 * sequence step if we gave the ESP a select
3304 * XXX See above, I could set the borken flag
3305 * XXX in the device struct and retry the
3306 * XXX command. But would that help for
3307 * XXX tagged capable targets?
3311 /* Arbitration won, target selected, maybe
3312 * sent the one message byte in message out
3313 * phase, but we did not go to command phase
3314 * in the end. Actually, we could have sent
3315 * only some of the message bytes if we tried
3316 * to send out the entire identify and tag
3317 * message using ESP_CMD_SA3.
3323 /* No, not the powerPC pinhead. Arbitration
3324 * won, all message bytes sent if we went to
3325 * message out phase, went to command phase
3326 * but only part of the command was sent.
3328 * XXX I've seen this, but usually in conjunction
3329 * XXX with a gross error which appears to have
3330 * XXX occurred between the time I told the
3331 * XXX ESP to arbitrate and when I got the
3332 * XXX interrupt. Could I have misloaded the
3333 * XXX command bytes into the fifo? Actually,
3334 * XXX I most likely missed a phase, and therefore
3335 * XXX went into never never land and didn't even
3336 * XXX know it. That was the old driver though.
3337 * XXX What is even more peculiar is that the ESP
3338 * XXX showed the proper function complete and
3339 * XXX bus service bits in the interrupt register.
3342 case ESP_STEP_FINI4
:
3343 case ESP_STEP_FINI5
:
3344 case ESP_STEP_FINI6
:
3345 case ESP_STEP_FINI7
:
3346 /* Account for the identify message */
3347 if (SCptr
->SCp
.phase
== in_slct_norm
)
3348 cmd_bytes_sent
-= 1;
3351 if (esp
->erev
!= fashme
)
3352 esp_cmd(esp
, ESP_CMD_NULL
);
3354 /* Be careful, we could really get fucked during synchronous
3355 * data transfers if we try to flush the fifo now.
3357 if ((esp
->erev
!= fashme
) && /* not a Happy Meal and... */
3358 !fcnt
&& /* Fifo is empty and... */
3359 /* either we are not doing synchronous transfers or... */
3360 (!esp_dev
->sync_max_offset
||
3361 /* We are not going into data in phase. */
3362 ((esp
->sreg
& ESP_STAT_PMASK
) != ESP_DIP
)))
3363 esp_cmd(esp
, ESP_CMD_FLUSH
); /* flush is safe */
3365 /* See how far we got if this is not a slow command. */
3366 if (!esp
->esp_slowcmd
) {
3367 if (cmd_bytes_sent
< 0)
3369 if (cmd_bytes_sent
!= SCptr
->cmd_len
) {
3370 /* Crapola, mark it as a slowcmd
3371 * so that we have some chance of
3372 * keeping the command alive with
3375 * XXX Actually, if we didn't send it all
3376 * XXX this means either we didn't set things
3377 * XXX up properly (driver bug) or the target
3378 * XXX or the ESP detected parity on one of
3379 * XXX the command bytes. This makes much
3380 * XXX more sense, and therefore this code
3381 * XXX should be changed to send out a
3382 * XXX parity error message or if the status
3383 * XXX register shows no parity error then
3384 * XXX just expect the target to bring the
3385 * XXX bus into message in phase so that it
3386 * XXX can send us the parity error message.
3389 esp
->esp_slowcmd
= 1;
3390 esp
->esp_scmdp
= &(SCptr
->cmnd
[cmd_bytes_sent
]);
3391 esp
->esp_scmdleft
= (SCptr
->cmd_len
- cmd_bytes_sent
);
3395 /* Now figure out where we went. */
3396 esp_advance_phase(SCptr
, in_the_dark
);
3397 return esp_do_phase_determine(esp
);
3400 /* Did the target even make it? */
3401 if (esp
->ireg
== ESP_INTR_DC
) {
3402 /* wheee... nobody there or they didn't like
3403 * what we told it to do, clean up.
3406 /* If anyone is off the bus, but working on
3407 * a command in the background for us, tell
3408 * the ESP to listen for them.
3410 if (esp
->disconnected_SC
)
3411 esp_cmd(esp
, ESP_CMD_ESEL
);
3413 if (((1<<SCptr
->device
->id
) & esp
->targets_present
) &&
3415 (esp
->cur_msgout
[0] == EXTENDED_MESSAGE
) &&
3416 (SCptr
->SCp
.phase
== in_slct_msg
||
3417 SCptr
->SCp
.phase
== in_slct_stop
)) {
3420 ESPLOG(("esp%d: Failed synchronous negotiation for target %d "
3421 "lun %d\n", esp
->esp_id
, SCptr
->device
->id
, SCptr
->device
->lun
));
3422 esp_dev
->sync_max_offset
= 0;
3423 esp_dev
->sync_min_period
= 0;
3424 esp_dev
->sync
= 1; /* so we don't negotiate again */
3426 /* Run the command again, this time though we
3427 * won't try to negotiate for synchronous transfers.
3429 * XXX I'd like to do something like send an
3430 * XXX INITIATOR_ERROR or ABORT message to the
3431 * XXX target to tell it, "Sorry I confused you,
3432 * XXX please come back and I will be nicer next
3433 * XXX time". But that requires having the target
3434 * XXX on the bus, and it has dropped BSY on us.
3436 esp
->current_SC
= NULL
;
3437 esp_advance_phase(SCptr
, not_issued
);
3438 prepend_SC(&esp
->issue_SC
, SCptr
);
3443 /* Ok, this is normal, this is what we see during boot
3444 * or whenever when we are scanning the bus for targets.
3445 * But first make sure that is really what is happening.
3447 if (((1<<SCptr
->device
->id
) & esp
->targets_present
)) {
3448 ESPLOG(("esp%d: Warning, live target %d not responding to "
3449 "selection.\n", esp
->esp_id
, SCptr
->device
->id
));
3451 /* This _CAN_ happen. The SCSI standard states that
3452 * the target is to _not_ respond to selection if
3453 * _it_ detects bad parity on the bus for any reason.
3454 * Therefore, we assume that if we've talked successfully
3455 * to this target before, bad parity is the problem.
3457 esp_done(esp
, (DID_PARITY
<< 16));
3459 /* Else, there really isn't anyone there. */
3460 ESPMISC(("esp: selection failure, maybe nobody there?\n"));
3461 ESPMISC(("esp: target %d lun %d\n",
3462 SCptr
->device
->id
, SCptr
->device
->lun
));
3463 esp_done(esp
, (DID_BAD_TARGET
<< 16));
3468 ESPLOG(("esp%d: Selection failure.\n", esp
->esp_id
));
3469 printk("esp%d: Currently -- ", esp
->esp_id
);
3470 esp_print_ireg(esp
->ireg
); printk(" ");
3471 esp_print_statreg(esp
->sreg
); printk(" ");
3472 esp_print_seqreg(esp
->seqreg
); printk("\n");
3473 printk("esp%d: New -- ", esp
->esp_id
);
3474 esp
->sreg
= sbus_readb(esp
->eregs
+ ESP_STATUS
);
3475 esp
->seqreg
= sbus_readb(esp
->eregs
+ ESP_SSTEP
);
3476 esp
->ireg
= sbus_readb(esp
->eregs
+ ESP_INTRPT
);
3477 esp_print_ireg(esp
->ireg
); printk(" ");
3478 esp_print_statreg(esp
->sreg
); printk(" ");
3479 esp_print_seqreg(esp
->seqreg
); printk("\n");
3480 ESPLOG(("esp%d: resetting bus\n", esp
->esp_id
));
3481 return do_reset_bus
; /* ugh... */
3484 /* Continue reading bytes for msgin phase. */
3485 static int esp_do_msgincont(struct esp
*esp
)
3487 if (esp
->ireg
& ESP_INTR_BSERV
) {
3488 /* in the right phase too? */
3489 if ((esp
->sreg
& ESP_STAT_PMASK
) == ESP_MIP
) {
3491 esp_cmd(esp
, ESP_CMD_TI
);
3492 esp_advance_phase(esp
->current_SC
, in_msgindone
);
3496 /* We changed phase but ESP shows bus service,
3497 * in this case it is most likely that we, the
3498 * hacker who has been up for 20hrs straight
3499 * staring at the screen, drowned in coffee
3500 * smelling like retched cigarette ashes
3501 * have miscoded something..... so, try to
3502 * recover as best we can.
3504 ESPLOG(("esp%d: message in mis-carriage.\n", esp
->esp_id
));
3506 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3507 return do_phase_determine
;
3510 static int check_singlebyte_msg(struct esp
*esp
)
3512 esp
->prevmsgin
= esp
->cur_msgin
[0];
3513 if (esp
->cur_msgin
[0] & 0x80) {
3515 ESPLOG(("esp%d: target sends identify amidst phases\n",
3517 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3519 } else if (((esp
->cur_msgin
[0] & 0xf0) == 0x20) ||
3520 (esp
->cur_msgin
[0] == EXTENDED_MESSAGE
)) {
3522 esp_advance_phase(esp
->current_SC
, in_msgincont
);
3525 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3526 switch (esp
->cur_msgin
[0]) {
3528 /* We don't want to hear about it. */
3529 ESPLOG(("esp%d: msg %02x which we don't know about\n", esp
->esp_id
,
3530 esp
->cur_msgin
[0]));
3531 return MESSAGE_REJECT
;
3534 ESPLOG(("esp%d: target %d sends a nop\n", esp
->esp_id
,
3535 esp
->current_SC
->device
->id
));
3538 case RESTORE_POINTERS
:
3539 /* In this case we might also have to backup the
3540 * "slow command" pointer. It is rare to get such
3541 * a save/restore pointer sequence so early in the
3542 * bus transition sequences, but cover it.
3544 if (esp
->esp_slowcmd
) {
3545 esp
->esp_scmdleft
= esp
->current_SC
->cmd_len
;
3546 esp
->esp_scmdp
= &esp
->current_SC
->cmnd
[0];
3548 esp_restore_pointers(esp
, esp
->current_SC
);
3552 esp_save_pointers(esp
, esp
->current_SC
);
3555 case COMMAND_COMPLETE
:
3557 /* Freeing the bus, let it go. */
3558 esp
->current_SC
->SCp
.phase
= in_freeing
;
3561 case MESSAGE_REJECT
:
3562 ESPMISC(("msg reject, "));
3563 if (esp
->prevmsgout
== EXTENDED_MESSAGE
) {
3564 struct esp_device
*esp_dev
= esp
->current_SC
->device
->hostdata
;
3566 /* Doesn't look like this target can
3567 * do synchronous or WIDE transfers.
3569 ESPSDTR(("got reject, was trying nego, clearing sync/WIDE\n"));
3572 esp_dev
->sync_min_period
= 0;
3573 esp_dev
->sync_max_offset
= 0;
3576 ESPMISC(("not sync nego, sending ABORT\n"));
3582 /* Target negotiates for synchronous transfers before we do, this
3583 * is legal although very strange. What is even funnier is that
3584 * the SCSI2 standard specifically recommends against targets doing
3585 * this because so many initiators cannot cope with this occurring.
3587 static int target_with_ants_in_pants(struct esp
*esp
,
3588 struct scsi_cmnd
*SCptr
,
3589 struct esp_device
*esp_dev
)
3591 if (esp_dev
->sync
|| SCptr
->device
->borken
) {
3592 /* sorry, no can do */
3593 ESPSDTR(("forcing to async, "));
3594 build_sync_nego_msg(esp
, 0, 0);
3597 ESPLOG(("esp%d: hoping for msgout\n", esp
->esp_id
));
3598 esp_advance_phase(SCptr
, in_the_dark
);
3599 return EXTENDED_MESSAGE
;
3602 /* Ok, we'll check them out... */
3606 static void sync_report(struct esp
*esp
)
3611 msg3
= esp
->cur_msgin
[3];
3612 msg4
= esp
->cur_msgin
[4];
3614 int hz
= 1000000000 / (msg3
* 4);
3615 int integer
= hz
/ 1000000;
3616 int fraction
= (hz
- (integer
* 1000000)) / 10000;
3617 if ((esp
->erev
== fashme
) &&
3618 (esp
->config3
[esp
->current_SC
->device
->id
] & ESP_CONFIG3_EWIDE
)) {
3622 } else if ((msg3
* 4) < 200) {
3625 type
= "synchronous";
3628 /* Do not transform this back into one big printk
3629 * again, it triggers a bug in our sparc64-gcc272
3630 * sibling call optimization. -DaveM
3632 ESPLOG((KERN_INFO
"esp%d: target %d ",
3633 esp
->esp_id
, esp
->current_SC
->device
->id
));
3634 ESPLOG(("[period %dns offset %d %d.%02dMHz ",
3635 (int) msg3
* 4, (int) msg4
,
3636 integer
, fraction
));
3637 ESPLOG(("%s SCSI%s]\n", type
,
3638 (((msg3
* 4) < 200) ? "-II" : "")));
3640 ESPLOG((KERN_INFO
"esp%d: target %d asynchronous\n",
3641 esp
->esp_id
, esp
->current_SC
->device
->id
));
3645 static int check_multibyte_msg(struct esp
*esp
)
3647 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
3648 struct esp_device
*esp_dev
= SCptr
->device
->hostdata
;
3650 int message_out
= 0;
3652 ESPSDTR(("chk multibyte msg: "));
3653 if (esp
->cur_msgin
[2] == EXTENDED_SDTR
) {
3654 int period
= esp
->cur_msgin
[3];
3655 int offset
= esp
->cur_msgin
[4];
3657 ESPSDTR(("is sync nego response, "));
3661 /* Target negotiates first! */
3662 ESPSDTR(("target jumps the gun, "));
3663 message_out
= EXTENDED_MESSAGE
; /* we must respond */
3664 rval
= target_with_ants_in_pants(esp
, SCptr
, esp_dev
);
3669 ESPSDTR(("examining sdtr, "));
3671 /* Offset cannot be larger than ESP fifo size. */
3673 ESPSDTR(("offset too big %2x, ", offset
));
3675 ESPSDTR(("sending back new offset\n"));
3676 build_sync_nego_msg(esp
, period
, offset
);
3677 return EXTENDED_MESSAGE
;
3680 if (offset
&& period
> esp
->max_period
) {
3681 /* Yeee, async for this slow device. */
3682 ESPSDTR(("period too long %2x, ", period
));
3683 build_sync_nego_msg(esp
, 0, 0);
3684 ESPSDTR(("hoping for msgout\n"));
3685 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3686 return EXTENDED_MESSAGE
;
3687 } else if (offset
&& period
< esp
->min_period
) {
3688 ESPSDTR(("period too short %2x, ", period
));
3689 period
= esp
->min_period
;
3690 if (esp
->erev
> esp236
)
3694 } else if (offset
) {
3697 ESPSDTR(("period is ok, "));
3698 tmp
= esp
->ccycle
/ 1000;
3699 regval
= (((period
<< 2) + tmp
- 1) / tmp
);
3700 if (regval
&& ((esp
->erev
== fas100a
||
3701 esp
->erev
== fas236
||
3702 esp
->erev
== fashme
))) {
3711 esp_dev
->sync_min_period
= (regval
& 0x1f);
3712 esp_dev
->sync_max_offset
= (offset
| esp
->radelay
);
3713 if (esp
->erev
== fas100a
|| esp
->erev
== fas236
|| esp
->erev
== fashme
) {
3714 if ((esp
->erev
== fas100a
) || (esp
->erev
== fashme
))
3715 bit
= ESP_CONFIG3_FAST
;
3717 bit
= ESP_CONFIG3_FSCSI
;
3719 /* On FAS366, if using fast-20 synchronous transfers
3720 * we need to make sure the REQ/ACK assert/deassert
3721 * control bits are clear.
3723 if (esp
->erev
== fashme
)
3724 esp_dev
->sync_max_offset
&= ~esp
->radelay
;
3725 esp
->config3
[SCptr
->device
->id
] |= bit
;
3727 esp
->config3
[SCptr
->device
->id
] &= ~bit
;
3729 esp
->prev_cfg3
= esp
->config3
[SCptr
->device
->id
];
3730 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
3732 esp
->prev_soff
= esp_dev
->sync_max_offset
;
3733 esp
->prev_stp
= esp_dev
->sync_min_period
;
3734 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
3735 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
3736 ESPSDTR(("soff=%2x stp=%2x cfg3=%2x\n",
3737 esp_dev
->sync_max_offset
,
3738 esp_dev
->sync_min_period
,
3739 esp
->config3
[SCptr
->device
->id
]));
3742 } else if (esp_dev
->sync_max_offset
) {
3745 /* back to async mode */
3746 ESPSDTR(("unaccaptable sync nego, forcing async\n"));
3747 esp_dev
->sync_max_offset
= 0;
3748 esp_dev
->sync_min_period
= 0;
3751 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
3752 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
3753 if (esp
->erev
== fas100a
|| esp
->erev
== fas236
|| esp
->erev
== fashme
) {
3754 if ((esp
->erev
== fas100a
) || (esp
->erev
== fashme
))
3755 bit
= ESP_CONFIG3_FAST
;
3757 bit
= ESP_CONFIG3_FSCSI
;
3758 esp
->config3
[SCptr
->device
->id
] &= ~bit
;
3759 esp
->prev_cfg3
= esp
->config3
[SCptr
->device
->id
];
3760 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
3766 ESPSDTR(("chk multibyte msg: sync is known, "));
3770 ESPLOG(("esp%d: sending sdtr back, hoping for msgout\n",
3772 build_sync_nego_msg(esp
, period
, offset
);
3773 esp_advance_phase(SCptr
, in_the_dark
);
3774 return EXTENDED_MESSAGE
;
3777 ESPSDTR(("returning zero\n"));
3778 esp_advance_phase(SCptr
, in_the_dark
); /* ...or else! */
3780 } else if (esp
->cur_msgin
[2] == EXTENDED_WDTR
) {
3781 int size
= 8 << esp
->cur_msgin
[3];
3784 if (esp
->erev
!= fashme
) {
3785 ESPLOG(("esp%d: AIEEE wide msg received and not HME.\n",
3787 message_out
= MESSAGE_REJECT
;
3788 } else if (size
> 16) {
3789 ESPLOG(("esp%d: AIEEE wide transfer for %d size "
3790 "not supported.\n", esp
->esp_id
, size
));
3791 message_out
= MESSAGE_REJECT
;
3793 /* Things look good; let's see what we got. */
3795 /* Set config 3 register for this target. */
3796 esp
->config3
[SCptr
->device
->id
] |= ESP_CONFIG3_EWIDE
;
3798 /* Just make sure it was one byte sized. */
3800 ESPLOG(("esp%d: Aieee, wide nego of %d size.\n",
3801 esp
->esp_id
, size
));
3802 message_out
= MESSAGE_REJECT
;
3805 /* Pure paranoia. */
3806 esp
->config3
[SCptr
->device
->id
] &= ~(ESP_CONFIG3_EWIDE
);
3808 esp
->prev_cfg3
= esp
->config3
[SCptr
->device
->id
];
3809 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
3811 /* Regardless, next try for sync transfers. */
3812 build_sync_nego_msg(esp
, esp
->sync_defp
, 15);
3815 message_out
= EXTENDED_MESSAGE
;
3817 } else if (esp
->cur_msgin
[2] == EXTENDED_MODIFY_DATA_POINTER
) {
3818 ESPLOG(("esp%d: rejecting modify data ptr msg\n", esp
->esp_id
));
3819 message_out
= MESSAGE_REJECT
;
3822 esp_advance_phase(SCptr
, in_the_dark
);
3826 static int esp_do_msgindone(struct esp
*esp
)
3828 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
3829 int message_out
= 0, it
= 0, rval
;
3831 rval
= skipahead1(esp
, SCptr
, in_msgin
, in_msgindone
);
3834 if (SCptr
->SCp
.sent_command
!= in_status
) {
3835 if (!(esp
->ireg
& ESP_INTR_DC
)) {
3836 if (esp
->msgin_len
&& (esp
->sreg
& ESP_STAT_PERR
)) {
3837 message_out
= MSG_PARITY_ERROR
;
3838 esp_cmd(esp
, ESP_CMD_FLUSH
);
3839 } else if (esp
->erev
!= fashme
&&
3840 (it
= (sbus_readb(esp
->eregs
+ ESP_FFLAGS
) & ESP_FF_FBYTES
)) != 1) {
3841 /* We certainly dropped the ball somewhere. */
3842 message_out
= INITIATOR_ERROR
;
3843 esp_cmd(esp
, ESP_CMD_FLUSH
);
3844 } else if (!esp
->msgin_len
) {
3845 if (esp
->erev
== fashme
)
3846 it
= esp
->hme_fifo_workaround_buffer
[0];
3848 it
= sbus_readb(esp
->eregs
+ ESP_FDATA
);
3849 esp_advance_phase(SCptr
, in_msgincont
);
3851 /* it is ok and we want it */
3852 if (esp
->erev
== fashme
)
3853 it
= esp
->cur_msgin
[esp
->msgin_ctr
] =
3854 esp
->hme_fifo_workaround_buffer
[0];
3856 it
= esp
->cur_msgin
[esp
->msgin_ctr
] =
3857 sbus_readb(esp
->eregs
+ ESP_FDATA
);
3861 esp_advance_phase(SCptr
, in_the_dark
);
3865 it
= esp
->cur_msgin
[0];
3867 if (!message_out
&& esp
->msgin_len
) {
3868 if (esp
->msgin_ctr
< esp
->msgin_len
) {
3869 esp_advance_phase(SCptr
, in_msgincont
);
3870 } else if (esp
->msgin_len
== 1) {
3871 message_out
= check_singlebyte_msg(esp
);
3872 } else if (esp
->msgin_len
== 2) {
3873 if (esp
->cur_msgin
[0] == EXTENDED_MESSAGE
) {
3874 if ((it
+ 2) >= 15) {
3875 message_out
= MESSAGE_REJECT
;
3877 esp
->msgin_len
= (it
+ 2);
3878 esp_advance_phase(SCptr
, in_msgincont
);
3881 message_out
= MESSAGE_REJECT
; /* foo on you */
3884 message_out
= check_multibyte_msg(esp
);
3887 if (message_out
< 0) {
3888 return -message_out
;
3889 } else if (message_out
) {
3890 if (((message_out
!= 1) &&
3891 ((message_out
< 0x20) || (message_out
& 0x80))))
3892 esp
->msgout_len
= 1;
3893 esp
->cur_msgout
[0] = message_out
;
3894 esp_cmd(esp
, ESP_CMD_SATN
);
3895 esp_advance_phase(SCptr
, in_the_dark
);
3898 esp
->sreg
= sbus_readb(esp
->eregs
+ ESP_STATUS
);
3899 esp
->sreg
&= ~(ESP_STAT_INTR
);
3900 if ((esp
->sreg
& (ESP_STAT_PMSG
|ESP_STAT_PCD
)) == (ESP_STAT_PMSG
|ESP_STAT_PCD
))
3901 esp_cmd(esp
, ESP_CMD_MOK
);
3902 if ((SCptr
->SCp
.sent_command
== in_msgindone
) &&
3903 (SCptr
->SCp
.phase
== in_freeing
))
3904 return esp_do_freebus(esp
);
3908 static int esp_do_cmdbegin(struct esp
*esp
)
3910 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
3912 esp_advance_phase(SCptr
, in_cmdend
);
3913 if (esp
->erev
== fashme
) {
3914 u32 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
3917 for (i
= 0; i
< esp
->esp_scmdleft
; i
++)
3918 esp
->esp_command
[i
] = *esp
->esp_scmdp
++;
3919 esp
->esp_scmdleft
= 0;
3920 esp_cmd(esp
, ESP_CMD_FLUSH
);
3921 esp_setcount(esp
->eregs
, i
, 1);
3922 esp_cmd(esp
, (ESP_CMD_DMA
| ESP_CMD_TI
));
3923 tmp
|= (DMA_SCSI_DISAB
| DMA_ENABLE
);
3924 tmp
&= ~(DMA_ST_WRITE
);
3925 sbus_writel(i
, esp
->dregs
+ DMA_COUNT
);
3926 sbus_writel(esp
->esp_command_dvma
, esp
->dregs
+ DMA_ADDR
);
3927 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
3931 esp_cmd(esp
, ESP_CMD_FLUSH
);
3932 tmp
= *esp
->esp_scmdp
++;
3933 esp
->esp_scmdleft
--;
3934 sbus_writeb(tmp
, esp
->eregs
+ ESP_FDATA
);
3935 esp_cmd(esp
, ESP_CMD_TI
);
3940 static int esp_do_cmddone(struct esp
*esp
)
3942 if (esp
->erev
== fashme
)
3943 dma_invalidate(esp
);
3945 esp_cmd(esp
, ESP_CMD_NULL
);
3947 if (esp
->ireg
& ESP_INTR_BSERV
) {
3948 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3949 return esp_do_phase_determine(esp
);
3952 ESPLOG(("esp%d: in do_cmddone() but didn't get BSERV interrupt.\n",
3954 return do_reset_bus
;
3957 static int esp_do_msgout(struct esp
*esp
)
3959 esp_cmd(esp
, ESP_CMD_FLUSH
);
3960 switch (esp
->msgout_len
) {
3962 if (esp
->erev
== fashme
)
3963 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 1);
3965 sbus_writeb(esp
->cur_msgout
[0], esp
->eregs
+ ESP_FDATA
);
3967 esp_cmd(esp
, ESP_CMD_TI
);
3971 esp
->esp_command
[0] = esp
->cur_msgout
[0];
3972 esp
->esp_command
[1] = esp
->cur_msgout
[1];
3974 if (esp
->erev
== fashme
) {
3975 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 2);
3976 esp_cmd(esp
, ESP_CMD_TI
);
3978 dma_setup(esp
, esp
->esp_command_dvma
, 2, 0);
3979 esp_setcount(esp
->eregs
, 2, 0);
3980 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
3985 esp
->esp_command
[0] = esp
->cur_msgout
[0];
3986 esp
->esp_command
[1] = esp
->cur_msgout
[1];
3987 esp
->esp_command
[2] = esp
->cur_msgout
[2];
3988 esp
->esp_command
[3] = esp
->cur_msgout
[3];
3991 if (esp
->erev
== fashme
) {
3992 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 4);
3993 esp_cmd(esp
, ESP_CMD_TI
);
3995 dma_setup(esp
, esp
->esp_command_dvma
, 4, 0);
3996 esp_setcount(esp
->eregs
, 4, 0);
3997 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
4002 esp
->esp_command
[0] = esp
->cur_msgout
[0];
4003 esp
->esp_command
[1] = esp
->cur_msgout
[1];
4004 esp
->esp_command
[2] = esp
->cur_msgout
[2];
4005 esp
->esp_command
[3] = esp
->cur_msgout
[3];
4006 esp
->esp_command
[4] = esp
->cur_msgout
[4];
4009 if (esp
->erev
== fashme
) {
4010 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 5);
4011 esp_cmd(esp
, ESP_CMD_TI
);
4013 dma_setup(esp
, esp
->esp_command_dvma
, 5, 0);
4014 esp_setcount(esp
->eregs
, 5, 0);
4015 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
4021 ESPMISC(("bogus msgout sending NOP\n"));
4022 esp
->cur_msgout
[0] = NOP
;
4024 if (esp
->erev
== fashme
) {
4025 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 1);
4027 sbus_writeb(esp
->cur_msgout
[0], esp
->eregs
+ ESP_FDATA
);
4030 esp
->msgout_len
= 1;
4031 esp_cmd(esp
, ESP_CMD_TI
);
4035 esp_advance_phase(esp
->current_SC
, in_msgoutdone
);
4039 static int esp_do_msgoutdone(struct esp
*esp
)
4041 if (esp
->msgout_len
> 1) {
4042 /* XXX HME/FAS ATN deassert workaround required,
4043 * XXX no DMA flushing, only possible ESP_CMD_FLUSH
4044 * XXX to kill the fifo.
4046 if (esp
->erev
!= fashme
) {
4049 while ((tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
)) & DMA_PEND_READ
)
4052 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
4053 dma_invalidate(esp
);
4055 esp_cmd(esp
, ESP_CMD_FLUSH
);
4058 if (!(esp
->ireg
& ESP_INTR_DC
)) {
4059 if (esp
->erev
!= fashme
)
4060 esp_cmd(esp
, ESP_CMD_NULL
);
4061 switch (esp
->sreg
& ESP_STAT_PMASK
) {
4063 /* whoops, parity error */
4064 ESPLOG(("esp%d: still in msgout, parity error assumed\n",
4066 if (esp
->msgout_len
> 1)
4067 esp_cmd(esp
, ESP_CMD_SATN
);
4068 esp_advance_phase(esp
->current_SC
, in_msgout
);
4075 /* Happy Meal fifo is touchy... */
4076 if ((esp
->erev
!= fashme
) &&
4078 !(((struct esp_device
*)esp
->current_SC
->device
->hostdata
)->sync_max_offset
))
4079 esp_cmd(esp
, ESP_CMD_FLUSH
);
4084 ESPLOG(("esp%d: disconnect, resetting bus\n", esp
->esp_id
));
4085 return do_reset_bus
;
4088 /* If we sent out a synchronous negotiation message, update
4091 if (esp
->cur_msgout
[2] == EXTENDED_MESSAGE
&&
4092 esp
->cur_msgout
[4] == EXTENDED_SDTR
) {
4093 esp
->snip
= 1; /* anal retentiveness... */
4096 esp
->prevmsgout
= esp
->cur_msgout
[0];
4097 esp
->msgout_len
= 0;
4098 esp_advance_phase(esp
->current_SC
, in_the_dark
);
4099 return esp_do_phase_determine(esp
);
4102 static int esp_bus_unexpected(struct esp
*esp
)
4104 ESPLOG(("esp%d: command in weird state %2x\n",
4105 esp
->esp_id
, esp
->current_SC
->SCp
.phase
));
4106 return do_reset_bus
;
4109 static espfunc_t bus_vector
[] = {
4122 esp_do_phase_determine
,
4128 /* This is the second tier in our dual-level SCSI state machine. */
4129 static int esp_work_bus(struct esp
*esp
)
4131 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
4134 ESPBUS(("esp_work_bus: "));
4136 ESPBUS(("reconnect\n"));
4137 return esp_do_reconnect(esp
);
4139 phase
= SCptr
->SCp
.phase
;
4140 if ((phase
& 0xf0) == in_phases_mask
)
4141 return bus_vector
[(phase
& 0x0f)](esp
);
4142 else if ((phase
& 0xf0) == in_slct_mask
)
4143 return esp_select_complete(esp
);
4145 return esp_bus_unexpected(esp
);
4148 static espfunc_t isvc_vector
[] = {
4150 esp_do_phase_determine
,
4156 /* Main interrupt handler for an esp adapter. */
4157 static void esp_handle(struct esp
*esp
)
4159 struct scsi_cmnd
*SCptr
;
4160 int what_next
= do_intr_end
;
4162 SCptr
= esp
->current_SC
;
4164 /* Check for errors. */
4165 esp
->sreg
= sbus_readb(esp
->eregs
+ ESP_STATUS
);
4166 esp
->sreg
&= (~ESP_STAT_INTR
);
4167 if (esp
->erev
== fashme
) {
4168 esp
->sreg2
= sbus_readb(esp
->eregs
+ ESP_STATUS2
);
4169 esp
->seqreg
= (sbus_readb(esp
->eregs
+ ESP_SSTEP
) & ESP_STEP_VBITS
);
4172 if (esp
->sreg
& (ESP_STAT_SPAM
)) {
4173 /* Gross error, could be due to one of:
4175 * - top of fifo overwritten, could be because
4176 * we tried to do a synchronous transfer with
4177 * an offset greater than ESP fifo size
4179 * - top of command register overwritten
4181 * - DMA setup to go in one direction, SCSI
4182 * bus points in the other, whoops
4184 * - weird phase change during asynchronous
4185 * data phase while we are initiator
4187 ESPLOG(("esp%d: Gross error sreg=%2x\n", esp
->esp_id
, esp
->sreg
));
4189 /* If a command is live on the bus we cannot safely
4190 * reset the bus, so we'll just let the pieces fall
4191 * where they may. Here we are hoping that the
4192 * target will be able to cleanly go away soon
4193 * so we can safely reset things.
4196 ESPLOG(("esp%d: No current cmd during gross error, "
4197 "resetting bus\n", esp
->esp_id
));
4198 what_next
= do_reset_bus
;
4203 if (sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_HNDL_ERROR
) {
4204 /* A DMA gate array error. Here we must
4205 * be seeing one of two things. Either the
4206 * virtual to physical address translation
4207 * on the SBUS could not occur, else the
4208 * translation it did get pointed to a bogus
4211 ESPLOG(("esp%d: DMA error %08x\n", esp
->esp_id
,
4212 sbus_readl(esp
->dregs
+ DMA_CSR
)));
4214 /* DMA gate array itself must be reset to clear the
4219 what_next
= do_reset_bus
;
4223 esp
->ireg
= sbus_readb(esp
->eregs
+ ESP_INTRPT
); /* Unlatch intr reg */
4225 if (esp
->erev
== fashme
) {
4226 /* This chip is really losing. */
4229 ESPHME(("sreg2=%02x,", esp
->sreg2
));
4230 /* Must latch fifo before reading the interrupt
4231 * register else garbage ends up in the FIFO
4232 * which confuses the driver utterly.
4234 if (!(esp
->sreg2
& ESP_STAT2_FEMPTY
) ||
4235 (esp
->sreg2
& ESP_STAT2_F1BYTE
)) {
4236 ESPHME(("fifo_workaround]"));
4239 ESPHME(("no_fifo_workaround]"));
4243 /* No current cmd is only valid at this point when there are
4244 * commands off the bus or we are trying a reset.
4246 if (!SCptr
&& !esp
->disconnected_SC
&& !(esp
->ireg
& ESP_INTR_SR
)) {
4247 /* Panic is safe, since current_SC is null. */
4248 ESPLOG(("esp%d: no command in esp_handle()\n", esp
->esp_id
));
4249 panic("esp_handle: current_SC == penguin within interrupt!");
4252 if (esp
->ireg
& (ESP_INTR_IC
)) {
4253 /* Illegal command fed to ESP. Outside of obvious
4254 * software bugs that could cause this, there is
4255 * a condition with esp100 where we can confuse the
4256 * ESP into an erroneous illegal command interrupt
4257 * because it does not scrape the FIFO properly
4258 * for reselection. See esp100_reconnect_hwbug()
4259 * to see how we try very hard to avoid this.
4261 ESPLOG(("esp%d: invalid command\n", esp
->esp_id
));
4263 esp_dump_state(esp
);
4265 if (SCptr
!= NULL
) {
4266 /* Devices with very buggy firmware can drop BSY
4267 * during a scatter list interrupt when using sync
4268 * mode transfers. We continue the transfer as
4269 * expected, the target drops the bus, the ESP
4270 * gets confused, and we get a illegal command
4271 * interrupt because the bus is in the disconnected
4272 * state now and ESP_CMD_TI is only allowed when
4273 * a nexus is alive on the bus.
4275 ESPLOG(("esp%d: Forcing async and disabling disconnect for "
4276 "target %d\n", esp
->esp_id
, SCptr
->device
->id
));
4277 SCptr
->device
->borken
= 1; /* foo on you */
4280 what_next
= do_reset_bus
;
4281 } else if (!(esp
->ireg
& ~(ESP_INTR_FDONE
| ESP_INTR_BSERV
| ESP_INTR_DC
))) {
4283 unsigned int phase
= SCptr
->SCp
.phase
;
4285 if (phase
& in_phases_mask
) {
4286 what_next
= esp_work_bus(esp
);
4287 } else if (phase
& in_slct_mask
) {
4288 what_next
= esp_select_complete(esp
);
4290 ESPLOG(("esp%d: interrupt for no good reason...\n",
4292 what_next
= do_intr_end
;
4295 ESPLOG(("esp%d: BSERV or FDONE or DC while SCptr==NULL\n",
4297 what_next
= do_reset_bus
;
4299 } else if (esp
->ireg
& ESP_INTR_SR
) {
4300 ESPLOG(("esp%d: SCSI bus reset interrupt\n", esp
->esp_id
));
4301 what_next
= do_reset_complete
;
4302 } else if (esp
->ireg
& (ESP_INTR_S
| ESP_INTR_SATN
)) {
4303 ESPLOG(("esp%d: AIEEE we have been selected by another initiator!\n",
4305 what_next
= do_reset_bus
;
4306 } else if (esp
->ireg
& ESP_INTR_RSEL
) {
4307 if (SCptr
== NULL
) {
4309 what_next
= esp_do_reconnect(esp
);
4310 } else if (SCptr
->SCp
.phase
& in_slct_mask
) {
4311 /* Only selection code knows how to clean
4314 ESPDISC(("Reselected during selection attempt\n"));
4315 what_next
= esp_select_complete(esp
);
4317 ESPLOG(("esp%d: Reselected while bus is busy\n",
4319 what_next
= do_reset_bus
;
4323 /* This is tier-one in our dual level SCSI state machine. */
4325 while (what_next
!= do_intr_end
) {
4326 if (what_next
>= do_phase_determine
&&
4327 what_next
< do_intr_end
) {
4328 what_next
= isvc_vector
[what_next
](esp
);
4330 /* state is completely lost ;-( */
4331 ESPLOG(("esp%d: interrupt engine loses state, resetting bus\n",
4333 what_next
= do_reset_bus
;
4338 /* Service only the ESP described by dev_id. */
4339 static irqreturn_t
esp_intr(int irq
, void *dev_id
, struct pt_regs
*pregs
)
4341 struct esp
*esp
= dev_id
;
4342 unsigned long flags
;
4344 spin_lock_irqsave(esp
->ehost
->host_lock
, flags
);
4345 if (ESP_IRQ_P(esp
->dregs
)) {
4346 ESP_INTSOFF(esp
->dregs
);
4348 ESPIRQ(("I[%d:%d](", smp_processor_id(), esp
->esp_id
));
4352 ESP_INTSON(esp
->dregs
);
4354 spin_unlock_irqrestore(esp
->ehost
->host_lock
, flags
);
4359 static int esp_slave_alloc(struct scsi_device
*SDptr
)
4361 struct esp_device
*esp_dev
=
4362 kmalloc(sizeof(struct esp_device
), GFP_ATOMIC
);
4366 memset(esp_dev
, 0, sizeof(struct esp_device
));
4367 SDptr
->hostdata
= esp_dev
;
4371 static void esp_slave_destroy(struct scsi_device
*SDptr
)
4373 struct esp
*esp
= (struct esp
*) SDptr
->host
->hostdata
;
4375 esp
->targets_present
&= ~(1 << SDptr
->id
);
4376 kfree(SDptr
->hostdata
);
4377 SDptr
->hostdata
= NULL
;
4380 static struct scsi_host_template driver_template
= {
4382 .proc_info
= esp_proc_info
,
4383 .name
= "Sun ESP 100/100a/200",
4384 .detect
= esp_detect
,
4385 .slave_alloc
= esp_slave_alloc
,
4386 .slave_destroy
= esp_slave_destroy
,
4387 .release
= esp_release
,
4389 .queuecommand
= esp_queue
,
4390 .eh_abort_handler
= esp_abort
,
4391 .eh_bus_reset_handler
= esp_reset
,
4394 .sg_tablesize
= SG_ALL
,
4396 .use_clustering
= ENABLE_CLUSTERING
,
4399 #include "scsi_module.c"
4401 MODULE_LICENSE("GPL");