1 /* $Id: esp.c,v 1.94 2000/03/30 02:09:10 davem Exp $
2 * esp.c: EnhancedScsiProcessor Sun SCSI driver code.
4 * Copyright (C) 1995, 1998 David S. Miller (davem@caip.rutgers.edu)
9 * 1) Maybe disable parity checking in config register one for SCSI1
10 * targets. (Gilmore says parity error on the SBus can lock up
12 * 2) Add support for DMA2 pipelining.
13 * 3) Add tagged queueing.
16 #include <linux/config.h>
17 #include <linux/kernel.h>
18 #include <linux/delay.h>
19 #include <linux/types.h>
20 #include <linux/string.h>
21 #include <linux/malloc.h>
22 #include <linux/blk.h>
23 #include <linux/proc_fs.h>
24 #include <linux/stat.h>
25 #include <linux/init.h>
26 #include <linux/spinlock.h>
34 #include <asm/system.h>
35 #include <asm/machines.h>
36 #include <asm/ptrace.h>
37 #include <asm/pgtable.h>
38 #include <asm/oplib.h>
41 #include <asm/idprom.h>
43 #include <linux/module.h>
46 /* #define DEBUG_ESP_HME */
47 /* #define DEBUG_ESP_DATA */
48 /* #define DEBUG_ESP_QUEUE */
49 /* #define DEBUG_ESP_DISCONNECT */
50 /* #define DEBUG_ESP_STATUS */
51 /* #define DEBUG_ESP_PHASES */
52 /* #define DEBUG_ESP_WORKBUS */
53 /* #define DEBUG_STATE_MACHINE */
54 /* #define DEBUG_ESP_CMDS */
55 /* #define DEBUG_ESP_IRQS */
56 /* #define DEBUG_SDTR */
57 /* #define DEBUG_ESP_SG */
59 /* Use the following to sprinkle debugging messages in a way which
60 * suits you if combinations of the above become too verbose when
61 * trying to track down a specific problem.
63 /* #define DEBUG_ESP_MISC */
65 #if defined(DEBUG_ESP)
66 #define ESPLOG(foo) printk foo
69 #endif /* (DEBUG_ESP) */
71 #if defined(DEBUG_ESP_HME)
72 #define ESPHME(foo) printk foo
77 #if defined(DEBUG_ESP_DATA)
78 #define ESPDATA(foo) printk foo
83 #if defined(DEBUG_ESP_QUEUE)
84 #define ESPQUEUE(foo) printk foo
89 #if defined(DEBUG_ESP_DISCONNECT)
90 #define ESPDISC(foo) printk foo
95 #if defined(DEBUG_ESP_STATUS)
96 #define ESPSTAT(foo) printk foo
101 #if defined(DEBUG_ESP_PHASES)
102 #define ESPPHASE(foo) printk foo
104 #define ESPPHASE(foo)
107 #if defined(DEBUG_ESP_WORKBUS)
108 #define ESPBUS(foo) printk foo
113 #if defined(DEBUG_ESP_IRQS)
114 #define ESPIRQ(foo) printk foo
119 #if defined(DEBUG_SDTR)
120 #define ESPSDTR(foo) printk foo
125 #if defined(DEBUG_ESP_MISC)
126 #define ESPMISC(foo) printk foo
131 /* Command phase enumeration. */
133 not_issued
= 0x00, /* Still in the issue_SC queue. */
135 /* Various forms of selecting a target. */
136 #define in_slct_mask 0x10
137 in_slct_norm
= 0x10, /* ESP is arbitrating, normal selection */
138 in_slct_stop
= 0x11, /* ESP will select, then stop with IRQ */
139 in_slct_msg
= 0x12, /* select, then send a message */
140 in_slct_tag
= 0x13, /* select and send tagged queue msg */
141 in_slct_sneg
= 0x14, /* select and acquire sync capabilities */
143 /* Any post selection activity. */
144 #define in_phases_mask 0x20
145 in_datain
= 0x20, /* Data is transferring from the bus */
146 in_dataout
= 0x21, /* Data is transferring to the bus */
147 in_data_done
= 0x22, /* Last DMA data operation done (maybe) */
148 in_msgin
= 0x23, /* Eating message from target */
149 in_msgincont
= 0x24, /* Eating more msg bytes from target */
150 in_msgindone
= 0x25, /* Decide what to do with what we got */
151 in_msgout
= 0x26, /* Sending message to target */
152 in_msgoutdone
= 0x27, /* Done sending msg out */
153 in_cmdbegin
= 0x28, /* Sending cmd after abnormal selection */
154 in_cmdend
= 0x29, /* Done sending slow cmd */
155 in_status
= 0x2a, /* Was in status phase, finishing cmd */
156 in_freeing
= 0x2b, /* freeing the bus for cmd cmplt or disc */
157 in_the_dark
= 0x2c, /* Don't know what bus phase we are in */
159 /* Special states, ie. not normal bus transitions... */
160 #define in_spec_mask 0x80
161 in_abortone
= 0x80, /* Aborting one command currently */
162 in_abortall
= 0x81, /* Blowing away all commands we have */
163 in_resetdev
= 0x82, /* SCSI target reset in progress */
164 in_resetbus
= 0x83, /* SCSI bus reset in progress */
165 in_tgterror
= 0x84, /* Target did something stupid */
169 /* Zero has special meaning, see skipahead[12]. */
172 /*1*/ do_phase_determine
,
174 /*3*/ do_reset_complete
,
179 /* The master ring of all esp hosts we are managing in this driver. */
180 static struct esp
*espchain
;
181 static spinlock_t espchain_lock
= SPIN_LOCK_UNLOCKED
;
182 static int esps_running
= 0;
184 /* Forward declarations. */
185 static void esp_intr(int irq
, void *dev_id
, struct pt_regs
*pregs
);
187 /* Debugging routines */
188 struct esp_cmdstrings
{
191 } esp_cmd_strings
[] = {
193 { ESP_CMD_NULL
, "ESP_NOP", },
194 { ESP_CMD_FLUSH
, "FIFO_FLUSH", },
195 { ESP_CMD_RC
, "RSTESP", },
196 { ESP_CMD_RS
, "RSTSCSI", },
197 /* Disconnected State Group */
198 { ESP_CMD_RSEL
, "RESLCTSEQ", },
199 { ESP_CMD_SEL
, "SLCTNATN", },
200 { ESP_CMD_SELA
, "SLCTATN", },
201 { ESP_CMD_SELAS
, "SLCTATNSTOP", },
202 { ESP_CMD_ESEL
, "ENSLCTRESEL", },
203 { ESP_CMD_DSEL
, "DISSELRESEL", },
204 { ESP_CMD_SA3
, "SLCTATN3", },
205 { ESP_CMD_RSEL3
, "RESLCTSEQ", },
206 /* Target State Group */
207 { ESP_CMD_SMSG
, "SNDMSG", },
208 { ESP_CMD_SSTAT
, "SNDSTATUS", },
209 { ESP_CMD_SDATA
, "SNDDATA", },
210 { ESP_CMD_DSEQ
, "DISCSEQ", },
211 { ESP_CMD_TSEQ
, "TERMSEQ", },
212 { ESP_CMD_TCCSEQ
, "TRGTCMDCOMPSEQ", },
213 { ESP_CMD_DCNCT
, "DISC", },
214 { ESP_CMD_RMSG
, "RCVMSG", },
215 { ESP_CMD_RCMD
, "RCVCMD", },
216 { ESP_CMD_RDATA
, "RCVDATA", },
217 { ESP_CMD_RCSEQ
, "RCVCMDSEQ", },
218 /* Initiator State Group */
219 { ESP_CMD_TI
, "TRANSINFO", },
220 { ESP_CMD_ICCSEQ
, "INICMDSEQCOMP", },
221 { ESP_CMD_MOK
, "MSGACCEPTED", },
222 { ESP_CMD_TPAD
, "TPAD", },
223 { ESP_CMD_SATN
, "SATN", },
224 { ESP_CMD_RATN
, "RATN", },
226 #define NUM_ESP_COMMANDS ((sizeof(esp_cmd_strings)) / (sizeof(struct esp_cmdstrings)))
228 /* Print textual representation of an ESP command */
229 static inline void esp_print_cmd(u8 espcmd
)
231 u8 dma_bit
= espcmd
& ESP_CMD_DMA
;
235 for (i
= 0; i
< NUM_ESP_COMMANDS
; i
++)
236 if (esp_cmd_strings
[i
].cmdchar
== espcmd
)
238 if (i
== NUM_ESP_COMMANDS
)
239 printk("ESP_Unknown");
241 printk("%s%s", esp_cmd_strings
[i
].text
,
242 ((dma_bit
) ? "+DMA" : ""));
245 /* Print the status register's value */
246 static inline void esp_print_statreg(u8 statreg
)
251 phase
= statreg
& ESP_STAT_PMASK
;
252 printk("%s,", (phase
== ESP_DOP
? "DATA-OUT" :
253 (phase
== ESP_DIP
? "DATA-IN" :
254 (phase
== ESP_CMDP
? "COMMAND" :
255 (phase
== ESP_STATP
? "STATUS" :
256 (phase
== ESP_MOP
? "MSG-OUT" :
257 (phase
== ESP_MIP
? "MSG_IN" :
259 if (statreg
& ESP_STAT_TDONE
)
260 printk("TRANS_DONE,");
261 if (statreg
& ESP_STAT_TCNT
)
262 printk("TCOUNT_ZERO,");
263 if (statreg
& ESP_STAT_PERR
)
265 if (statreg
& ESP_STAT_SPAM
)
267 if (statreg
& ESP_STAT_INTR
)
272 /* Print the interrupt register's value */
273 static inline void esp_print_ireg(u8 intreg
)
276 if (intreg
& ESP_INTR_S
)
277 printk("SLCT_NATN ");
278 if (intreg
& ESP_INTR_SATN
)
280 if (intreg
& ESP_INTR_RSEL
)
282 if (intreg
& ESP_INTR_FDONE
)
284 if (intreg
& ESP_INTR_BSERV
)
286 if (intreg
& ESP_INTR_DC
)
288 if (intreg
& ESP_INTR_IC
)
290 if (intreg
& ESP_INTR_SR
)
291 printk("SCSI_BUS_RESET ");
295 /* Print the sequence step registers contents */
296 static inline void esp_print_seqreg(u8 stepreg
)
298 stepreg
&= ESP_STEP_VBITS
;
300 (stepreg
== ESP_STEP_ASEL
? "SLCT_ARB_CMPLT" :
301 (stepreg
== ESP_STEP_SID
? "1BYTE_MSG_SENT" :
302 (stepreg
== ESP_STEP_NCMD
? "NOT_IN_CMD_PHASE" :
303 (stepreg
== ESP_STEP_PPC
? "CMD_BYTES_LOST" :
304 (stepreg
== ESP_STEP_FINI4
? "CMD_SENT_OK" :
308 static char *phase_string(int phase
)
364 #ifdef DEBUG_STATE_MACHINE
365 static inline void esp_advance_phase(Scsi_Cmnd
*s
, int newphase
)
367 ESPLOG(("<%s>", phase_string(newphase
)));
368 s
->SCp
.sent_command
= s
->SCp
.phase
;
369 s
->SCp
.phase
= newphase
;
372 #define esp_advance_phase(__s, __newphase) \
373 (__s)->SCp.sent_command = (__s)->SCp.phase; \
374 (__s)->SCp.phase = (__newphase);
377 #ifdef DEBUG_ESP_CMDS
378 extern inline void esp_cmd(struct esp
*esp
, u8 cmd
)
380 esp
->espcmdlog
[esp
->espcmdent
] = cmd
;
381 esp
->espcmdent
= (esp
->espcmdent
+ 1) & 31;
382 sbus_writeb(cmd
, esp
->eregs
+ ESP_CMD
);
385 #define esp_cmd(__esp, __cmd) \
386 sbus_writeb((__cmd), ((__esp)->eregs) + ESP_CMD)
389 #define ESP_INTSOFF(__dregs) \
390 sbus_writel(sbus_readl((__dregs)+DMA_CSR)&~(DMA_INT_ENAB), (__dregs)+DMA_CSR)
391 #define ESP_INTSON(__dregs) \
392 sbus_writel(sbus_readl((__dregs)+DMA_CSR)|DMA_INT_ENAB, (__dregs)+DMA_CSR)
393 #define ESP_IRQ_P(__dregs) \
394 (sbus_readl((__dregs)+DMA_CSR) & (DMA_HNDL_INTR|DMA_HNDL_ERROR))
396 /* How we use the various Linux SCSI data structures for operation.
400 * We keep track of the syncronous capabilities of a target
401 * in the device member, using sync_min_period and
402 * sync_max_offset. These are the values we directly write
403 * into the ESP registers while running a command. If offset
404 * is zero the ESP will use asynchronous transfers.
405 * If the borken flag is set we assume we shouldn't even bother
406 * trying to negotiate for synchronous transfer as this target
407 * is really stupid. If we notice the target is dropping the
408 * bus, and we have been allowing it to disconnect, we clear
409 * the disconnect flag.
413 /* Manipulation of the ESP command queues. Thanks to the aha152x driver
414 * and its author, Juergen E. Fischer, for the methods used here.
415 * Note that these are per-ESP queues, not global queues like
416 * the aha152x driver uses.
418 static inline void append_SC(Scsi_Cmnd
**SC
, Scsi_Cmnd
*new_SC
)
422 new_SC
->host_scribble
= (unsigned char *) NULL
;
426 for (end
=*SC
;end
->host_scribble
;end
=(Scsi_Cmnd
*)end
->host_scribble
)
428 end
->host_scribble
= (unsigned char *) new_SC
;
432 static inline void prepend_SC(Scsi_Cmnd
**SC
, Scsi_Cmnd
*new_SC
)
434 new_SC
->host_scribble
= (unsigned char *) *SC
;
438 static inline Scsi_Cmnd
*remove_first_SC(Scsi_Cmnd
**SC
)
443 *SC
= (Scsi_Cmnd
*) (*SC
)->host_scribble
;
447 static inline Scsi_Cmnd
*remove_SC(Scsi_Cmnd
**SC
, int target
, int lun
)
449 Scsi_Cmnd
*ptr
, *prev
;
451 for (ptr
= *SC
, prev
= NULL
;
452 ptr
&& ((ptr
->target
!= target
) || (ptr
->lun
!= lun
));
453 prev
= ptr
, ptr
= (Scsi_Cmnd
*) ptr
->host_scribble
)
457 prev
->host_scribble
=ptr
->host_scribble
;
459 *SC
=(Scsi_Cmnd
*)ptr
->host_scribble
;
464 /* Resetting various pieces of the ESP scsi driver chipset/buses. */
465 static void esp_reset_dma(struct esp
*esp
)
468 int can_do_burst16
, can_do_burst32
, can_do_burst64
;
472 can_do_burst16
= (esp
->bursts
& DMA_BURST16
) != 0;
473 can_do_burst32
= (esp
->bursts
& DMA_BURST32
) != 0;
476 if (sbus_can_dma_64bit(esp
->sdev
))
478 if (sbus_can_burst64(esp
->sdev
))
479 can_do_burst64
= (esp
->bursts
& DMA_BURST64
) != 0;
481 /* Punt the DVMA into a known state. */
482 if (esp
->dma
->revision
!= dvmahme
) {
483 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
484 sbus_writel(tmp
| DMA_RST_SCSI
, esp
->dregs
+ DMA_CSR
);
485 sbus_writel(tmp
& ~DMA_RST_SCSI
, esp
->dregs
+ DMA_CSR
);
487 switch (esp
->dma
->revision
) {
489 /* This is the HME DVMA gate array. */
491 save_flags(flags
); cli(); /* I really hate this chip. */
493 sbus_writel(DMA_RESET_FAS366
, esp
->dregs
+ DMA_CSR
);
494 sbus_writel(DMA_RST_SCSI
, esp
->dregs
+ DMA_CSR
);
496 esp
->prev_hme_dmacsr
= (DMA_PARITY_OFF
|DMA_2CLKS
|DMA_SCSI_DISAB
|DMA_INT_ENAB
);
497 esp
->prev_hme_dmacsr
&= ~(DMA_ENABLE
|DMA_ST_WRITE
|DMA_BRST_SZ
);
500 esp
->prev_hme_dmacsr
|= DMA_BRST64
;
501 else if (can_do_burst32
)
502 esp
->prev_hme_dmacsr
|= DMA_BRST32
;
505 esp
->prev_hme_dmacsr
|= DMA_SCSI_SBUS64
;
506 sbus_set_sbus64(esp
->sdev
, esp
->bursts
);
509 /* This chip is horrible. */
510 while (sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_PEND_READ
)
513 sbus_writel(0, esp
->dregs
+ DMA_CSR
);
514 sbus_writel(esp
->prev_hme_dmacsr
, esp
->dregs
+ DMA_CSR
);
516 /* This is necessary to avoid having the SCSI channel
517 * engine lock up on us.
519 sbus_writel(0, esp
->dregs
+ DMA_ADDR
);
521 restore_flags(flags
);
524 /* This is the gate array found in the sun4m
525 * NCR SBUS I/O subsystem.
527 if (esp
->erev
!= esp100
) {
528 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
529 sbus_writel(tmp
| DMA_3CLKS
, esp
->dregs
+ DMA_CSR
);
533 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
536 if (can_do_burst32
) {
540 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
543 /* This is the DMA unit found on SCSI/Ether cards. */
544 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
545 tmp
|= DMA_ADD_ENABLE
;
546 tmp
&= ~DMA_BCNT_ENAB
;
547 if (!can_do_burst32
&& can_do_burst16
) {
548 tmp
|= DMA_ESC_BURST
;
550 tmp
&= ~(DMA_ESC_BURST
);
552 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
557 ESP_INTSON(esp
->dregs
);
560 /* Reset the ESP chip, _not_ the SCSI bus. */
561 static void __init
esp_reset_esp(struct esp
*esp
)
563 u8 family_code
, version
;
566 /* Now reset the ESP chip */
567 esp_cmd(esp
, ESP_CMD_RC
);
568 esp_cmd(esp
, ESP_CMD_NULL
| ESP_CMD_DMA
);
569 esp_cmd(esp
, ESP_CMD_NULL
| ESP_CMD_DMA
);
571 /* Reload the configuration registers */
572 sbus_writeb(esp
->cfact
, esp
->eregs
+ ESP_CFACT
);
574 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
576 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
577 sbus_writeb(esp
->neg_defp
, esp
->eregs
+ ESP_TIMEO
);
579 /* This is the only point at which it is reliable to read
580 * the ID-code for a fast ESP chip variants.
582 esp
->max_period
= ((35 * esp
->ccycle
) / 1000);
583 if (esp
->erev
== fast
) {
584 version
= sbus_readb(esp
->eregs
+ ESP_UID
);
585 family_code
= (version
& 0xf8) >> 3;
586 if (family_code
== 0x02)
588 else if (family_code
== 0x0a)
589 esp
->erev
= fashme
; /* Version is usually '5'. */
592 ESPMISC(("esp%d: FAST chip is %s (family=%d, version=%d)\n",
594 (esp
->erev
== fas236
) ? "fas236" :
595 ((esp
->erev
== fas100a
) ? "fas100a" :
596 "fasHME"), family_code
, (version
& 7)));
598 esp
->min_period
= ((4 * esp
->ccycle
) / 1000);
600 esp
->min_period
= ((5 * esp
->ccycle
) / 1000);
602 esp
->max_period
= (esp
->max_period
+ 3)>>2;
603 esp
->min_period
= (esp
->min_period
+ 3)>>2;
605 sbus_writeb(esp
->config1
, esp
->eregs
+ ESP_CFG1
);
611 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
615 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
616 esp
->prev_cfg3
= esp
->config3
[0];
617 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
620 esp
->config2
|= (ESP_CONFIG2_HME32
| ESP_CONFIG2_HMEFENAB
);
623 /* Fast 236 or HME */
624 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
625 for (i
= 0; i
< 16; i
++) {
626 if (esp
->erev
== fashme
) {
629 cfg3
= ESP_CONFIG3_FCLOCK
| ESP_CONFIG3_OBPUSH
;
630 if (esp
->scsi_id
>= 8)
631 cfg3
|= ESP_CONFIG3_IDBIT3
;
632 esp
->config3
[i
] |= cfg3
;
634 esp
->config3
[i
] |= ESP_CONFIG3_FCLK
;
637 esp
->prev_cfg3
= esp
->config3
[0];
638 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
639 if (esp
->erev
== fashme
) {
650 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
651 for (i
= 0; i
< 16; i
++)
652 esp
->config3
[i
] |= ESP_CONFIG3_FCLOCK
;
653 esp
->prev_cfg3
= esp
->config3
[0];
654 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
658 panic("esp: what could it be... I wonder...");
662 /* Eat any bitrot in the chip */
663 sbus_readb(esp
->eregs
+ ESP_INTRPT
);
667 /* This places the ESP into a known state at boot time. */
668 static void __init
esp_bootup_reset(struct esp
*esp
)
678 /* Reset the SCSI bus, but tell ESP not to generate an irq */
679 tmp
= sbus_readb(esp
->eregs
+ ESP_CFG1
);
680 tmp
|= ESP_CONFIG1_SRRDISAB
;
681 sbus_writeb(tmp
, esp
->eregs
+ ESP_CFG1
);
683 esp_cmd(esp
, ESP_CMD_RS
);
686 sbus_writeb(esp
->config1
, esp
->eregs
+ ESP_CFG1
);
688 /* Eat any bitrot in the chip and we are done... */
689 sbus_readb(esp
->eregs
+ ESP_INTRPT
);
692 static void esp_chain_add(struct esp
*esp
)
694 spin_lock_irq(&espchain_lock
);
696 struct esp
*elink
= espchain
;
704 spin_unlock_irq(&espchain_lock
);
707 static void esp_chain_del(struct esp
*esp
)
709 spin_lock_irq(&espchain_lock
);
710 if (espchain
== esp
) {
711 espchain
= esp
->next
;
713 struct esp
*elink
= espchain
;
714 while (elink
->next
!= esp
)
716 elink
->next
= esp
->next
;
719 spin_unlock_irq(&espchain_lock
);
722 static int __init
esp_find_dvma(struct esp
*esp
, struct sbus_dev
*dma_sdev
)
724 struct sbus_dev
*sdev
= esp
->sdev
;
725 struct sbus_dma
*dma
;
727 if (dma_sdev
!= NULL
) {
729 if (dma
->sdev
== dma_sdev
)
734 /* If allocated already, can't use it. */
738 if (dma
->sdev
== NULL
)
741 /* If bus + slot are the same and it has the
742 * correct OBP name, it's ours.
744 if (sdev
->bus
== dma
->sdev
->bus
&&
745 sdev
->slot
== dma
->sdev
->slot
&&
746 (!strcmp(dma
->sdev
->prom_name
, "dma") ||
747 !strcmp(dma
->sdev
->prom_name
, "espdma")))
752 /* If we don't know how to handle the dvma,
753 * do not use this device.
756 printk("Cannot find dvma for ESP%d's SCSI\n", esp
->esp_id
);
759 if (dma
->allocated
) {
760 printk("esp%d: can't use my espdma\n", esp
->esp_id
);
765 esp
->dregs
= dma
->regs
;
770 static int __init
esp_map_regs(struct esp
*esp
, int hme
)
772 struct sbus_dev
*sdev
= esp
->sdev
;
773 struct resource
*res
;
775 /* On HME, two reg sets exist, first is DVMA,
776 * second is ESP registers.
779 res
= &sdev
->resource
[1];
781 res
= &sdev
->resource
[0];
783 esp
->eregs
= sbus_ioremap(res
, 0, ESP_REG_SIZE
, "ESP Registers");
790 static int __init
esp_map_cmdarea(struct esp
*esp
)
792 struct sbus_dev
*sdev
= esp
->sdev
;
794 esp
->esp_command
= sbus_alloc_consistent(sdev
, 16,
795 &esp
->esp_command_dvma
);
796 if (esp
->esp_command
== NULL
||
797 esp
->esp_command_dvma
== 0)
802 static int __init
esp_register_irq(struct esp
*esp
)
804 esp
->ehost
->irq
= esp
->irq
= esp
->sdev
->irqs
[0];
806 /* We used to try various overly-clever things to
807 * reduce the interrupt processing overhead on
808 * sun4c/sun4m when multiple ESP's shared the
809 * same IRQ. It was too complex and messy to
812 if (request_irq(esp
->ehost
->irq
, esp_intr
,
813 SA_SHIRQ
, "ESP SCSI", esp
)) {
814 printk("esp%d: Cannot acquire irq line\n",
819 printk("esp%d: IRQ %s ", esp
->esp_id
,
820 __irq_itoa(esp
->ehost
->irq
));
825 static void __init
esp_get_scsi_id(struct esp
*esp
)
827 struct sbus_dev
*sdev
= esp
->sdev
;
829 esp
->scsi_id
= prom_getintdefault(esp
->prom_node
,
832 if (esp
->scsi_id
== -1)
833 esp
->scsi_id
= prom_getintdefault(esp
->prom_node
,
836 if (esp
->scsi_id
== -1)
837 esp
->scsi_id
= (sdev
->bus
== NULL
) ? 7 :
838 prom_getintdefault(sdev
->bus
->prom_node
,
841 esp
->ehost
->this_id
= esp
->scsi_id
;
842 esp
->scsi_id_mask
= (1 << esp
->scsi_id
);
846 static void __init
esp_get_clock_params(struct esp
*esp
)
848 struct sbus_dev
*sdev
= esp
->sdev
;
849 int prom_node
= esp
->prom_node
;
854 if (sdev
!= NULL
&& sdev
->bus
!= NULL
)
855 sbus_prom_node
= sdev
->bus
->prom_node
;
859 /* This is getting messy but it has to be done
860 * correctly or else you get weird behavior all
861 * over the place. We are trying to basically
862 * figure out three pieces of information.
864 * a) Clock Conversion Factor
866 * This is a representation of the input
867 * crystal clock frequency going into the
868 * ESP on this machine. Any operation whose
869 * timing is longer than 400ns depends on this
870 * value being correct. For example, you'll
871 * get blips for arbitration/selection during
872 * high load or with multiple targets if this
873 * is not set correctly.
875 * b) Selection Time-Out
877 * The ESP isn't very bright and will arbitrate
878 * for the bus and try to select a target
879 * forever if you let it. This value tells
880 * the ESP when it has taken too long to
881 * negotiate and that it should interrupt
882 * the CPU so we can see what happened.
883 * The value is computed as follows (from
884 * NCR/Symbios chip docs).
886 * (Time Out Period) * (Input Clock)
887 * STO = ----------------------------------
888 * (8192) * (Clock Conversion Factor)
890 * You usually want the time out period to be
891 * around 250ms, I think we'll set it a little
892 * bit higher to account for fully loaded SCSI
893 * bus's and slow devices that don't respond so
894 * quickly to selection attempts. (yeah, I know
895 * this is out of spec. but there is a lot of
896 * buggy pieces of firmware out there so bite me)
898 * c) Imperical constants for synchronous offset
899 * and transfer period register values
901 * This entails the smallest and largest sync
902 * period we could ever handle on this ESP.
905 fmhz
= prom_getintdefault(prom_node
, "clock-frequency", -1);
907 fmhz
= (!sbus_prom_node
) ? 0 :
908 prom_getintdefault(sbus_prom_node
, "clock-frequency", -1);
910 if (fmhz
<= (5000000))
913 ccf
= (((5000000 - 1) + (fmhz
))/(5000000));
915 if (!ccf
|| ccf
> 8) {
916 /* If we can't find anything reasonable,
917 * just assume 20MHZ. This is the clock
918 * frequency of the older sun4c's where I've
919 * been unable to find the clock-frequency
920 * PROM property. All other machines provide
921 * useful values it seems.
927 if (ccf
== (ESP_CCF_F7
+ 1))
928 esp
->cfact
= ESP_CCF_F0
;
929 else if (ccf
== ESP_CCF_NEVER
)
930 esp
->cfact
= ESP_CCF_F2
;
933 esp
->raw_cfact
= ccf
;
936 esp
->ccycle
= ESP_MHZ_TO_CYCLE(fmhz
);
937 esp
->ctick
= ESP_TICK(ccf
, esp
->ccycle
);
938 esp
->neg_defp
= ESP_NEG_DEFP(fmhz
, ccf
);
939 esp
->sync_defp
= SYNC_DEFP_SLOW
;
941 printk("SCSI ID %d Clk %dMHz CCYC=%d CCF=%d TOut %d ",
942 esp
->scsi_id
, (fmhz
/ 1000000),
943 (int)esp
->ccycle
, (int)ccf
, (int) esp
->neg_defp
);
946 static void __init
esp_get_bursts(struct esp
*esp
, struct sbus_dev
*dma
)
948 struct sbus_dev
*sdev
= esp
->sdev
;
951 bursts
= prom_getintdefault(esp
->prom_node
, "burst-sizes", 0xff);
954 u8 tmp
= prom_getintdefault(dma
->prom_node
,
955 "burst-sizes", 0xff);
961 u8 tmp
= prom_getintdefault(sdev
->bus
->prom_node
,
962 "burst-sizes", 0xff);
967 if (bursts
== 0xff ||
968 (bursts
& DMA_BURST16
) == 0 ||
969 (bursts
& DMA_BURST32
) == 0)
970 bursts
= (DMA_BURST32
- 1);
972 esp
->bursts
= bursts
;
975 static void __init
esp_get_revision(struct esp
*esp
)
979 esp
->config1
= (ESP_CONFIG1_PENABLE
| (esp
->scsi_id
& 7));
980 esp
->config2
= (ESP_CONFIG2_SCSI2ENAB
| ESP_CONFIG2_REGPARITY
);
981 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
983 tmp
= sbus_readb(esp
->eregs
+ ESP_CFG2
);
984 tmp
&= ~ESP_CONFIG2_MAGIC
;
985 if (tmp
!= (ESP_CONFIG2_SCSI2ENAB
| ESP_CONFIG2_REGPARITY
)) {
986 /* If what we write to cfg2 does not come back, cfg2
987 * is not implemented, therefore this must be a plain
991 printk("NCR53C90(esp100)\n");
994 esp
->prev_cfg3
= esp
->config3
[0] = 5;
995 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
996 sbus_writeb(0, esp
->eregs
+ ESP_CFG3
);
997 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
999 tmp
= sbus_readb(esp
->eregs
+ ESP_CFG3
);
1001 /* The cfg2 register is implemented, however
1002 * cfg3 is not, must be esp100a.
1004 esp
->erev
= esp100a
;
1005 printk("NCR53C90A(esp100a)\n");
1009 for (target
= 0; target
< 16; target
++)
1010 esp
->config3
[target
] = 0;
1012 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
1014 /* All of cfg{1,2,3} implemented, must be one of
1015 * the fas variants, figure out which one.
1017 if (esp
->raw_cfact
> ESP_CCF_F5
) {
1019 esp
->sync_defp
= SYNC_DEFP_FAST
;
1020 printk("NCR53C9XF(espfast)\n");
1023 printk("NCR53C9x(esp236)\n");
1026 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
1031 static void __init
esp_init_swstate(struct esp
*esp
)
1035 /* Driver spinlock... */
1036 spin_lock_init(&esp
->lock
);
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;
1049 for(i
= 0; i
< 32; i
++)
1050 esp
->espcmdlog
[i
] = 0;
1053 /* MSG phase state... */
1054 for(i
= 0; i
< 16; i
++) {
1055 esp
->cur_msgout
[i
] = 0;
1056 esp
->cur_msgin
[i
] = 0;
1058 esp
->prevmsgout
= esp
->prevmsgin
= 0;
1059 esp
->msgout_len
= esp
->msgin_len
= 0;
1061 /* Clear the one behind caches to hold unmatchable values. */
1062 esp
->prev_soff
= esp
->prev_stp
= esp
->prev_cfg3
= 0xff;
1063 esp
->prev_hme_dmacsr
= 0xffffffff;
1066 static int __init
detect_one_esp(Scsi_Host_Template
*tpnt
, struct sbus_dev
*esp_dev
,
1067 struct sbus_dev
*espdma
, struct sbus_bus
*sbus
,
1070 struct Scsi_Host
*esp_host
= scsi_register(tpnt
, sizeof(struct esp
));
1074 printk("ESP: Cannot register SCSI host\n");
1078 esp_host
->max_id
= 16;
1079 esp
= (struct esp
*) esp_host
->hostdata
;
1080 esp
->ehost
= esp_host
;
1081 esp
->sdev
= esp_dev
;
1083 esp
->prom_node
= esp_dev
->prom_node
;
1084 prom_getstring(esp
->prom_node
, "name", esp
->prom_name
,
1085 sizeof(esp
->prom_name
));
1088 if (esp_find_dvma(esp
, espdma
) < 0)
1090 if (esp_map_regs(esp
, hme
) < 0) {
1091 printk("ESP registers unmappable");
1092 goto fail_dvma_release
;
1094 if (esp_map_cmdarea(esp
) < 0) {
1095 printk("ESP DVMA transport area unmappable");
1096 goto fail_unmap_regs
;
1098 if (esp_register_irq(esp
) < 0)
1099 goto fail_unmap_cmdarea
;
1101 esp_get_scsi_id(esp
);
1103 esp
->diff
= prom_getbool(esp
->prom_node
, "differential");
1105 printk("Differential ");
1107 esp_get_clock_params(esp
);
1108 esp_get_bursts(esp
, espdma
);
1109 esp_get_revision(esp
);
1110 esp_init_swstate(esp
);
1112 esp_bootup_reset(esp
);
1117 sbus_free_consistent(esp
->sdev
, 16,
1118 (void *) esp
->esp_command
,
1119 esp
->esp_command_dvma
);
1122 sbus_iounmap(esp
->eregs
, ESP_REG_SIZE
);
1125 esp
->dma
->allocated
= 0;
1129 scsi_unregister(esp_host
);
1133 /* Detecting ESP chips on the machine. This is the simple and easy
1139 #include <asm/sun4paddr.h>
1141 int __init
esp_detect(Scsi_Host_Template
*tpnt
)
1143 static struct sbus_dev esp_dev
;
1144 int esps_in_use
= 0;
1148 if (sun4_esp_physaddr
) {
1149 memset (&esp_dev
, 0, sizeof(esp_dev
));
1150 esp_dev
.reg_addrs
[0].phys_addr
= sun4_esp_physaddr
;
1151 esp_dev
.irqs
[0] = 4;
1152 esp_dev
.resource
[0].start
= sun4_esp_physaddr
;
1153 esp_dev
.resource
[0].end
= sun4_esp_physaddr
+ ESP_REG_SIZE
- 1;
1154 esp_dev
.resource
[0].flags
= IORESOURCE_IO
;
1156 if (!detect_one_esp(tpnt
, &esp_dev
, NULL
, NULL
, 0, 0))
1158 printk("ESP: Total of 1 ESP hosts found, %d actually in use.\n", esps_in_use
);
1159 esps_running
= esps_in_use
;
1164 #else /* !CONFIG_SUN4 */
1166 int __init
esp_detect(Scsi_Host_Template
*tpnt
)
1168 struct sbus_bus
*sbus
;
1169 struct sbus_dev
*esp_dev
, *sbdev_iter
;
1170 int nesps
= 0, esps_in_use
= 0;
1177 panic("No SBUS in esp_detect()");
1180 for_each_sbus(sbus
) {
1181 for_each_sbusdev(sbdev_iter
, sbus
) {
1182 struct sbus_dev
*espdma
= NULL
;
1185 /* Is it an esp sbus device? */
1186 esp_dev
= sbdev_iter
;
1187 if (strcmp(esp_dev
->prom_name
, "esp") &&
1188 strcmp(esp_dev
->prom_name
, "SUNW,esp")) {
1189 if (!strcmp(esp_dev
->prom_name
, "SUNW,fas")) {
1193 if (!esp_dev
->child
||
1194 (strcmp(esp_dev
->prom_name
, "espdma") &&
1195 strcmp(esp_dev
->prom_name
, "dma")))
1196 continue; /* nope... */
1198 esp_dev
= esp_dev
->child
;
1199 if (strcmp(esp_dev
->prom_name
, "esp") &&
1200 strcmp(esp_dev
->prom_name
, "SUNW,esp"))
1201 continue; /* how can this happen? */
1205 if (detect_one_esp(tpnt
, esp_dev
, espdma
, sbus
, nesps
++, hme
) < 0)
1209 } /* for each sbusdev */
1210 } /* for each sbus */
1211 printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps
,
1213 esps_running
= esps_in_use
;
1217 #endif /* !CONFIG_SUN4 */
1219 /* The info function will return whatever useful
1220 * information the developer sees fit. If not provided, then
1221 * the name field will be used instead.
1223 const char *esp_info(struct Scsi_Host
*host
)
1227 esp
= (struct esp
*) host
->hostdata
;
1228 switch (esp
->erev
) {
1230 return "Sparc ESP100 (NCR53C90)";
1232 return "Sparc ESP100A (NCR53C90A)";
1234 return "Sparc ESP236";
1236 return "Sparc ESP236-FAST";
1238 return "Sparc ESP366-HME";
1240 return "Sparc ESP100A-FAST";
1242 return "Bogon ESP revision";
1246 /* From Wolfgang Stanglmeier's NCR scsi driver. */
1255 static void copy_mem_info(struct info_str
*info
, char *data
, int len
)
1257 if (info
->pos
+ len
> info
->length
)
1258 len
= info
->length
- info
->pos
;
1260 if (info
->pos
+ len
< info
->offset
) {
1264 if (info
->pos
< info
->offset
) {
1265 data
+= (info
->offset
- info
->pos
);
1266 len
-= (info
->offset
- info
->pos
);
1270 memcpy(info
->buffer
+ info
->pos
, data
, len
);
1275 static int copy_info(struct info_str
*info
, char *fmt
, ...)
1281 va_start(args
, fmt
);
1282 len
= vsprintf(buf
, fmt
, args
);
1285 copy_mem_info(info
, buf
, len
);
1289 static int esp_host_info(struct esp
*esp
, char *ptr
, off_t offset
, int len
)
1291 struct info_str info
;
1296 info
.offset
= offset
;
1299 copy_info(&info
, "Sparc ESP Host Adapter:\n");
1300 copy_info(&info
, "\tPROM node\t\t%08x\n", (unsigned int) esp
->prom_node
);
1301 copy_info(&info
, "\tPROM name\t\t%s\n", esp
->prom_name
);
1302 copy_info(&info
, "\tESP Model\t\t");
1303 switch (esp
->erev
) {
1305 copy_info(&info
, "ESP100\n");
1308 copy_info(&info
, "ESP100A\n");
1311 copy_info(&info
, "ESP236\n");
1314 copy_info(&info
, "FAS236\n");
1317 copy_info(&info
, "FAS100A\n");
1320 copy_info(&info
, "FAST\n");
1323 copy_info(&info
, "Happy Meal FAS\n");
1327 copy_info(&info
, "Unknown!\n");
1330 copy_info(&info
, "\tDMA Revision\t\t");
1331 switch (esp
->dma
->revision
) {
1333 copy_info(&info
, "Rev 0\n");
1336 copy_info(&info
, "ESC Rev 1\n");
1339 copy_info(&info
, "Rev 1\n");
1342 copy_info(&info
, "Rev 2\n");
1345 copy_info(&info
, "Rev 3\n");
1348 copy_info(&info
, "Rev 1+\n");
1351 copy_info(&info
, "Rev HME/FAS\n");
1354 copy_info(&info
, "Unknown!\n");
1357 copy_info(&info
, "\tLive Targets\t\t[ ");
1358 for (i
= 0; i
< 15; i
++) {
1359 if (esp
->targets_present
& (1 << i
))
1360 copy_info(&info
, "%d ", i
);
1362 copy_info(&info
, "]\n\n");
1364 /* Now describe the state of each existing target. */
1365 copy_info(&info
, "Target #\tconfig3\t\tSync Capabilities\tDisconnect\tWide\n");
1366 for (i
= 0; i
< 15; i
++) {
1367 if (esp
->targets_present
& (1 << i
)) {
1368 Scsi_Device
*SDptr
= esp
->ehost
->host_queue
;
1370 while ((SDptr
->host
!= esp
->ehost
) &&
1373 SDptr
= SDptr
->next
;
1375 copy_info(&info
, "%d\t\t", i
);
1376 copy_info(&info
, "%08lx\t", esp
->config3
[i
]);
1377 copy_info(&info
, "[%02lx,%02lx]\t\t\t", SDptr
->sync_max_offset
,
1378 SDptr
->sync_min_period
);
1379 copy_info(&info
, "%s\t\t", SDptr
->disconnect
? "yes" : "no");
1380 copy_info(&info
, "%s\n",
1381 (esp
->config3
[i
] & ESP_CONFIG3_EWIDE
) ? "yes" : "no");
1384 return info
.pos
> info
.offset
? info
.pos
- info
.offset
: 0;
1387 /* ESP proc filesystem code. */
1388 int esp_proc_info(char *buffer
, char **start
, off_t offset
, int length
,
1389 int hostno
, int inout
)
1394 return -EINVAL
; /* not yet */
1397 if (esp
->ehost
->host_no
== hostno
)
1406 return esp_host_info(esp
, buffer
, offset
, length
);
1409 static void esp_get_dmabufs(struct esp
*esp
, Scsi_Cmnd
*sp
)
1411 if (sp
->use_sg
== 0) {
1412 sp
->SCp
.this_residual
= sp
->request_bufflen
;
1413 sp
->SCp
.buffer
= (struct scatterlist
*) sp
->request_buffer
;
1414 sp
->SCp
.buffers_residual
= 0;
1415 if (sp
->request_bufflen
) {
1416 sp
->SCp
.have_data_in
= sbus_map_single(esp
->sdev
, sp
->SCp
.buffer
,
1417 sp
->SCp
.this_residual
,
1418 scsi_to_sbus_dma_dir(sp
->sc_data_direction
));
1419 sp
->SCp
.ptr
= (char *) ((unsigned long)sp
->SCp
.have_data_in
);
1424 sp
->SCp
.buffer
= (struct scatterlist
*) sp
->buffer
;
1425 sp
->SCp
.buffers_residual
= sbus_map_sg(esp
->sdev
,
1428 scsi_to_sbus_dma_dir(sp
->sc_data_direction
));
1429 sp
->SCp
.this_residual
= sg_dma_len(sp
->SCp
.buffer
);
1430 sp
->SCp
.ptr
= (char *) ((unsigned long)sg_dma_address(sp
->SCp
.buffer
));
1434 static void esp_release_dmabufs(struct esp
*esp
, Scsi_Cmnd
*sp
)
1437 sbus_unmap_sg(esp
->sdev
, sp
->buffer
, sp
->use_sg
,
1438 scsi_to_sbus_dma_dir(sp
->sc_data_direction
));
1439 } else if (sp
->request_bufflen
) {
1440 sbus_unmap_single(esp
->sdev
,
1441 sp
->SCp
.have_data_in
,
1442 sp
->request_bufflen
,
1443 scsi_to_sbus_dma_dir(sp
->sc_data_direction
));
1447 static void esp_restore_pointers(struct esp
*esp
, Scsi_Cmnd
*sp
)
1449 struct esp_pointers
*ep
= &esp
->data_pointers
[sp
->target
];
1451 sp
->SCp
.ptr
= ep
->saved_ptr
;
1452 sp
->SCp
.buffer
= ep
->saved_buffer
;
1453 sp
->SCp
.this_residual
= ep
->saved_this_residual
;
1454 sp
->SCp
.buffers_residual
= ep
->saved_buffers_residual
;
1457 static void esp_save_pointers(struct esp
*esp
, Scsi_Cmnd
*sp
)
1459 struct esp_pointers
*ep
= &esp
->data_pointers
[sp
->target
];
1461 ep
->saved_ptr
= sp
->SCp
.ptr
;
1462 ep
->saved_buffer
= sp
->SCp
.buffer
;
1463 ep
->saved_this_residual
= sp
->SCp
.this_residual
;
1464 ep
->saved_buffers_residual
= sp
->SCp
.buffers_residual
;
1469 * 1) Never ever panic while something is live on the bus.
1470 * If there is to be any chance of syncing the disks this
1471 * rule is to be obeyed.
1473 * 2) Any target that causes a foul condition will no longer
1474 * have synchronous transfers done to it, no questions
1477 * 3) Keep register accesses to a minimum. Think about some
1478 * day when we have Xbus machines this is running on and
1479 * the ESP chip is on the other end of the machine on a
1480 * different board from the cpu where this is running.
1483 /* Fire off a command. We assume the bus is free and that the only
1484 * case where we could see an interrupt is where we have disconnected
1485 * commands active and they are trying to reselect us.
1487 static inline void esp_check_cmd(struct esp
*esp
, Scsi_Cmnd
*sp
)
1489 switch (sp
->cmd_len
) {
1493 esp
->esp_slowcmd
= 0;
1497 esp
->esp_slowcmd
= 1;
1498 esp
->esp_scmdleft
= sp
->cmd_len
;
1499 esp
->esp_scmdp
= &sp
->cmnd
[0];
1504 static inline void build_sync_nego_msg(struct esp
*esp
, int period
, int offset
)
1506 esp
->cur_msgout
[0] = EXTENDED_MESSAGE
;
1507 esp
->cur_msgout
[1] = 3;
1508 esp
->cur_msgout
[2] = EXTENDED_SDTR
;
1509 esp
->cur_msgout
[3] = period
;
1510 esp
->cur_msgout
[4] = offset
;
1511 esp
->msgout_len
= 5;
1514 /* SIZE is in bits, currently HME only supports 16 bit wide transfers. */
1515 static inline void build_wide_nego_msg(struct esp
*esp
, int size
)
1517 esp
->cur_msgout
[0] = EXTENDED_MESSAGE
;
1518 esp
->cur_msgout
[1] = 2;
1519 esp
->cur_msgout
[2] = EXTENDED_WDTR
;
1522 esp
->cur_msgout
[3] = 2;
1525 esp
->cur_msgout
[3] = 1;
1529 esp
->cur_msgout
[3] = 0;
1533 esp
->msgout_len
= 4;
1536 static void esp_exec_cmd(struct esp
*esp
)
1540 volatile u8
*cmdp
= esp
->esp_command
;
1545 /* Hold off if we have disconnected commands and
1546 * an IRQ is showing...
1548 if (esp
->disconnected_SC
&& ESP_IRQ_P(esp
->dregs
))
1551 /* Grab first member of the issue queue. */
1552 SCptr
= esp
->current_SC
= remove_first_SC(&esp
->issue_SC
);
1554 /* Safe to panic here because current_SC is null. */
1556 panic("esp: esp_exec_cmd and issue queue is NULL");
1558 SDptr
= SCptr
->device
;
1560 target
= SCptr
->target
;
1563 esp
->msgout_len
= 0;
1565 /* Send it out whole, or piece by piece? The ESP
1566 * only knows how to automatically send out 6, 10,
1567 * and 12 byte commands. I used to think that the
1568 * Linux SCSI code would never throw anything other
1569 * than that to us, but then again there is the
1570 * SCSI generic driver which can send us anything.
1572 esp_check_cmd(esp
, SCptr
);
1574 /* If arbitration/selection is successful, the ESP will leave
1575 * ATN asserted, causing the target to go into message out
1576 * phase. The ESP will feed the target the identify and then
1577 * the target can only legally go to one of command,
1578 * datain/out, status, or message in phase, or stay in message
1579 * out phase (should we be trying to send a sync negotiation
1580 * message after the identify). It is not allowed to drop
1581 * BSY, but some buggy targets do and we check for this
1582 * condition in the selection complete code. Most of the time
1583 * we'll make the command bytes available to the ESP and it
1584 * will not interrupt us until it finishes command phase, we
1585 * cannot do this for command sizes the ESP does not
1586 * understand and in this case we'll get interrupted right
1587 * when the target goes into command phase.
1589 * It is absolutely _illegal_ in the presence of SCSI-2 devices
1590 * to use the ESP select w/o ATN command. When SCSI-2 devices are
1591 * present on the bus we _must_ always go straight to message out
1592 * phase with an identify message for the target. Being that
1593 * selection attempts in SCSI-1 w/o ATN was an option, doing SCSI-2
1594 * selections should not confuse SCSI-1 we hope.
1598 /* this targets sync is known */
1600 if (SDptr
->disconnect
)
1601 *cmdp
++ = IDENTIFY(1, lun
);
1603 *cmdp
++ = IDENTIFY(0, lun
);
1605 if (esp
->esp_slowcmd
) {
1606 the_esp_command
= (ESP_CMD_SELAS
| ESP_CMD_DMA
);
1607 esp_advance_phase(SCptr
, in_slct_stop
);
1609 the_esp_command
= (ESP_CMD_SELA
| ESP_CMD_DMA
);
1610 esp_advance_phase(SCptr
, in_slct_norm
);
1612 } else if (!(esp
->targets_present
& (1<<target
)) || !(SDptr
->disconnect
)) {
1613 /* After the bootup SCSI code sends both the
1614 * TEST_UNIT_READY and INQUIRY commands we want
1615 * to at least attempt allowing the device to
1618 ESPMISC(("esp: Selecting device for first time. target=%d "
1619 "lun=%d\n", target
, SCptr
->lun
));
1620 if (!SDptr
->borken
&& !SDptr
->disconnect
)
1621 SDptr
->disconnect
= 1;
1623 *cmdp
++ = IDENTIFY(0, lun
);
1624 esp
->prevmsgout
= NOP
;
1625 esp_advance_phase(SCptr
, in_slct_norm
);
1626 the_esp_command
= (ESP_CMD_SELA
| ESP_CMD_DMA
);
1628 /* Take no chances... */
1629 SDptr
->sync_max_offset
= 0;
1630 SDptr
->sync_min_period
= 0;
1632 /* Sorry, I have had way too many problems with
1633 * various CDROM devices on ESP. -DaveM
1635 int cdrom_hwbug_wkaround
= 0;
1637 /* Never allow disconnects or synchronous transfers on
1638 * SparcStation1 and SparcStation1+. Allowing those
1639 * to be enabled seems to lockup the machine completely.
1641 if ((idprom
->id_machtype
== (SM_SUN4C
| SM_4C_SS1
)) ||
1642 (idprom
->id_machtype
== (SM_SUN4C
| SM_4C_SS1PLUS
))) {
1643 /* But we are nice and allow tapes and removable
1644 * disks (but not CDROMs) to disconnect.
1646 if(SDptr
->type
== TYPE_TAPE
||
1647 (SDptr
->type
!= TYPE_ROM
&& SDptr
->removable
))
1648 SDptr
->disconnect
= 1;
1650 SDptr
->disconnect
= 0;
1651 SDptr
->sync_max_offset
= 0;
1652 SDptr
->sync_min_period
= 0;
1658 /* We've talked to this guy before,
1659 * but never negotiated. Let's try,
1660 * need to attempt WIDE first, before
1661 * sync nego, as per SCSI 2 standard.
1663 if (esp
->erev
== fashme
&& !SDptr
->wide
) {
1664 if (!SDptr
->borken
&&
1665 SDptr
->type
!= TYPE_ROM
&&
1666 SDptr
->removable
== 0) {
1667 build_wide_nego_msg(esp
, 16);
1670 goto after_nego_msg_built
;
1673 /* Fall through and try sync. */
1677 if (!SDptr
->borken
) {
1678 if ((SDptr
->type
== TYPE_ROM
)) {
1679 /* Nice try sucker... */
1680 ESPMISC(("esp%d: Disabling sync for buggy "
1681 "CDROM.\n", esp
->esp_id
));
1682 cdrom_hwbug_wkaround
= 1;
1683 build_sync_nego_msg(esp
, 0, 0);
1684 } else if (SDptr
->removable
!= 0) {
1685 ESPMISC(("esp%d: Not negotiating sync/wide but "
1686 "allowing disconnect for removable media.\n",
1688 build_sync_nego_msg(esp
, 0, 0);
1690 build_sync_nego_msg(esp
, esp
->sync_defp
, 15);
1693 build_sync_nego_msg(esp
, 0, 0);
1698 after_nego_msg_built
:
1699 /* A fix for broken SCSI1 targets, when they disconnect
1700 * they lock up the bus and confuse ESP. So disallow
1701 * disconnects for SCSI1 targets for now until we
1702 * find a better fix.
1704 * Addendum: This is funny, I figured out what was going
1705 * on. The blotzed SCSI1 target would disconnect,
1706 * one of the other SCSI2 targets or both would be
1707 * disconnected as well. The SCSI1 target would
1708 * stay disconnected long enough that we start
1709 * up a command on one of the SCSI2 targets. As
1710 * the ESP is arbitrating for the bus the SCSI1
1711 * target begins to arbitrate as well to reselect
1712 * the ESP. The SCSI1 target refuses to drop it's
1713 * ID bit on the data bus even though the ESP is
1714 * at ID 7 and is the obvious winner for any
1715 * arbitration. The ESP is a poor sport and refuses
1716 * to lose arbitration, it will continue indefinately
1717 * trying to arbitrate for the bus and can only be
1718 * stopped via a chip reset or SCSI bus reset.
1719 * Therefore _no_ disconnects for SCSI1 targets
1720 * thank you very much. ;-)
1722 if(((SDptr
->scsi_level
< 3) &&
1723 (SDptr
->type
!= TYPE_TAPE
) &&
1724 SDptr
->removable
== 0) ||
1725 cdrom_hwbug_wkaround
|| SDptr
->borken
) {
1726 ESPMISC((KERN_INFO
"esp%d: Disabling DISCONNECT for target %d "
1727 "lun %d\n", esp
->esp_id
, SCptr
->target
, SCptr
->lun
));
1728 SDptr
->disconnect
= 0;
1729 *cmdp
++ = IDENTIFY(0, lun
);
1731 *cmdp
++ = IDENTIFY(1, lun
);
1734 /* ESP fifo is only so big...
1735 * Make this look like a slow command.
1737 esp
->esp_slowcmd
= 1;
1738 esp
->esp_scmdleft
= SCptr
->cmd_len
;
1739 esp
->esp_scmdp
= &SCptr
->cmnd
[0];
1741 the_esp_command
= (ESP_CMD_SELAS
| ESP_CMD_DMA
);
1742 esp_advance_phase(SCptr
, in_slct_msg
);
1745 if (!esp
->esp_slowcmd
)
1746 for (i
= 0; i
< SCptr
->cmd_len
; i
++)
1747 *cmdp
++ = SCptr
->cmnd
[i
];
1750 if (esp
->erev
== fashme
)
1751 sbus_writeb((target
& 0xf) | (ESP_BUSID_RESELID
| ESP_BUSID_CTR32BIT
),
1752 esp
->eregs
+ ESP_BUSID
);
1754 sbus_writeb(target
& 7, esp
->eregs
+ ESP_BUSID
);
1755 if (esp
->prev_soff
!= SDptr
->sync_max_offset
||
1756 esp
->prev_stp
!= SDptr
->sync_min_period
||
1757 (esp
->erev
> esp100a
&&
1758 esp
->prev_cfg3
!= esp
->config3
[target
])) {
1759 esp
->prev_soff
= SDptr
->sync_max_offset
;
1760 esp
->prev_stp
= SDptr
->sync_min_period
;
1761 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
1762 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
1763 if (esp
->erev
> esp100a
) {
1764 esp
->prev_cfg3
= esp
->config3
[target
];
1765 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
1768 i
= (cmdp
- esp
->esp_command
);
1770 if (esp
->erev
== fashme
) {
1771 esp_cmd(esp
, ESP_CMD_FLUSH
); /* Grrr! */
1773 /* Set up the DMA and HME counters */
1774 sbus_writeb(i
, esp
->eregs
+ ESP_TCLOW
);
1775 sbus_writeb(0, esp
->eregs
+ ESP_TCMED
);
1776 sbus_writeb(0, esp
->eregs
+ FAS_RLO
);
1777 sbus_writeb(0, esp
->eregs
+ FAS_RHI
);
1778 esp_cmd(esp
, the_esp_command
);
1780 /* Talk about touchy hardware... */
1781 esp
->prev_hme_dmacsr
= ((esp
->prev_hme_dmacsr
|
1782 (DMA_SCSI_DISAB
| DMA_ENABLE
)) &
1784 sbus_writel(16, esp
->dregs
+ DMA_COUNT
);
1785 sbus_writel(esp
->esp_command_dvma
, esp
->dregs
+ DMA_ADDR
);
1786 sbus_writel(esp
->prev_hme_dmacsr
, esp
->dregs
+ DMA_CSR
);
1790 /* Set up the DMA and ESP counters */
1791 sbus_writeb(i
, esp
->eregs
+ ESP_TCLOW
);
1792 sbus_writeb(0, esp
->eregs
+ ESP_TCMED
);
1793 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
1794 tmp
&= ~DMA_ST_WRITE
;
1796 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
1797 if (esp
->dma
->revision
== dvmaesc1
) {
1798 if (i
) /* Workaround ESC gate array SBUS rerun bug. */
1799 sbus_writel(PAGE_SIZE
, esp
->dregs
+ DMA_COUNT
);
1801 sbus_writel(esp
->esp_command_dvma
, esp
->dregs
+ DMA_ADDR
);
1803 /* Tell ESP to "go". */
1804 esp_cmd(esp
, the_esp_command
);
1808 /* Queue a SCSI command delivered from the mid-level Linux SCSI code. */
1809 int esp_queue(Scsi_Cmnd
*SCpnt
, void (*done
)(Scsi_Cmnd
*))
1812 unsigned long flags
;
1814 /* Set up func ptr and initial driver cmd-phase. */
1815 SCpnt
->scsi_done
= done
;
1816 SCpnt
->SCp
.phase
= not_issued
;
1818 /* We use the scratch area. */
1819 ESPQUEUE(("esp_queue: target=%d lun=%d ", SCpnt
->target
, SCpnt
->lun
));
1820 ESPDISC(("N<%02x,%02x>", SCpnt
->target
, SCpnt
->lun
));
1822 esp
= (struct esp
*) SCpnt
->host
->hostdata
;
1823 esp_get_dmabufs(esp
, SCpnt
);
1824 esp_save_pointers(esp
, SCpnt
); /* FIXME for tag queueing */
1826 SCpnt
->SCp
.Status
= CHECK_CONDITION
;
1827 SCpnt
->SCp
.Message
= 0xff;
1828 SCpnt
->SCp
.sent_command
= 0;
1830 spin_lock_irqsave(&esp
->lock
, flags
);
1832 /* Place into our queue. */
1833 if (SCpnt
->cmnd
[0] == REQUEST_SENSE
) {
1834 ESPQUEUE(("RQSENSE\n"));
1835 prepend_SC(&esp
->issue_SC
, SCpnt
);
1838 append_SC(&esp
->issue_SC
, SCpnt
);
1841 /* Run it now if we can. */
1842 if (!esp
->current_SC
&& !esp
->resetting_bus
)
1845 spin_unlock_irqrestore(&esp
->lock
, flags
);
1850 /* Only queuing supported in this ESP driver. */
1851 int esp_command(Scsi_Cmnd
*SCpnt
)
1853 struct esp
*esp
= (struct esp
*) SCpnt
->host
->hostdata
;
1855 ESPLOG(("esp%d: esp_command() called...\n", esp
->esp_id
));
1859 /* Dump driver state. */
1860 static void esp_dump_cmd(Scsi_Cmnd
*SCptr
)
1862 ESPLOG(("[tgt<%02x> lun<%02x> "
1863 "pphase<%s> cphase<%s>]",
1864 SCptr
->target
, SCptr
->lun
,
1865 phase_string(SCptr
->SCp
.sent_command
),
1866 phase_string(SCptr
->SCp
.phase
)));
1869 static void esp_dump_state(struct esp
*esp
)
1871 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
1872 #ifdef DEBUG_ESP_CMDS
1876 ESPLOG(("esp%d: dumping state\n", esp
->esp_id
));
1877 ESPLOG(("esp%d: dma -- cond_reg<%08x> addr<%08x>\n",
1879 sbus_readl(esp
->dregs
+ DMA_CSR
),
1880 sbus_readl(esp
->dregs
+ DMA_ADDR
)));
1881 ESPLOG(("esp%d: SW [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
1882 esp
->esp_id
, esp
->sreg
, esp
->seqreg
, esp
->ireg
));
1883 ESPLOG(("esp%d: HW reread [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
1885 sbus_readb(esp
->eregs
+ ESP_STATUS
),
1886 sbus_readb(esp
->eregs
+ ESP_SSTEP
),
1887 sbus_readb(esp
->eregs
+ ESP_INTRPT
)));
1888 #ifdef DEBUG_ESP_CMDS
1889 printk("esp%d: last ESP cmds [", esp
->esp_id
);
1890 i
= (esp
->espcmdent
- 1) & 31;
1891 printk("<"); esp_print_cmd(esp
->espcmdlog
[i
]); printk(">");
1893 printk("<"); esp_print_cmd(esp
->espcmdlog
[i
]); printk(">");
1895 printk("<"); esp_print_cmd(esp
->espcmdlog
[i
]); printk(">");
1897 printk("<"); esp_print_cmd(esp
->espcmdlog
[i
]); printk(">");
1899 #endif /* (DEBUG_ESP_CMDS) */
1902 ESPLOG(("esp%d: current command ", esp
->esp_id
));
1903 esp_dump_cmd(SCptr
);
1906 SCptr
= esp
->disconnected_SC
;
1907 ESPLOG(("esp%d: disconnected ", esp
->esp_id
));
1909 esp_dump_cmd(SCptr
);
1910 SCptr
= (Scsi_Cmnd
*) SCptr
->host_scribble
;
1915 /* Abort a command. */
1916 int esp_abort(Scsi_Cmnd
*SCptr
)
1918 struct esp
*esp
= (struct esp
*) SCptr
->host
->hostdata
;
1919 unsigned long flags
;
1922 spin_lock_irqsave(&esp
->lock
, flags
);
1924 ESPLOG(("esp%d: Aborting command\n", esp
->esp_id
));
1925 esp_dump_state(esp
);
1927 /* Wheee, if this is the current command on the bus, the
1928 * best we can do is assert ATN and wait for msgout phase.
1929 * This should even fix a hung SCSI bus when we lose state
1930 * in the driver and timeout because the eventual phase change
1931 * will cause the ESP to (eventually) give an interrupt.
1933 if (esp
->current_SC
== SCptr
) {
1934 esp
->cur_msgout
[0] = ABORT
;
1935 esp
->msgout_len
= 1;
1936 esp
->msgout_ctr
= 0;
1937 esp_cmd(esp
, ESP_CMD_SATN
);
1938 spin_unlock_irqrestore(&esp
->lock
, flags
);
1939 return SCSI_ABORT_PENDING
;
1942 /* If it is still in the issue queue then we can safely
1943 * call the completion routine and report abort success.
1945 don
= (sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_INT_ENAB
);
1947 ESP_INTSOFF(esp
->dregs
);
1949 if (esp
->issue_SC
) {
1950 Scsi_Cmnd
**prev
, *this;
1951 for (prev
= (&esp
->issue_SC
), this = esp
->issue_SC
;
1953 prev
= (Scsi_Cmnd
**) &(this->host_scribble
),
1954 this = (Scsi_Cmnd
*) this->host_scribble
) {
1956 if (this == SCptr
) {
1957 *prev
= (Scsi_Cmnd
*) this->host_scribble
;
1958 this->host_scribble
= NULL
;
1960 spin_unlock_irqrestore(&esp
->lock
, flags
);
1962 esp_release_dmabufs(esp
, this);
1963 this->result
= DID_ABORT
<< 16;
1964 this->scsi_done(this);
1966 ESP_INTSON(esp
->dregs
);
1968 return SCSI_ABORT_SUCCESS
;
1973 /* Yuck, the command to abort is disconnected, it is not
1974 * worth trying to abort it now if something else is live
1975 * on the bus at this time. So, we let the SCSI code wait
1976 * a little bit and try again later.
1978 if (esp
->current_SC
) {
1980 ESP_INTSON(esp
->dregs
);
1981 spin_unlock_irqrestore(&esp
->lock
, flags
);
1982 return SCSI_ABORT_BUSY
;
1985 /* It's disconnected, we have to reconnect to re-establish
1986 * the nexus and tell the device to abort. However, we really
1987 * cannot 'reconnect' per se, therefore we tell the upper layer
1988 * the safest thing we can. This is, wait a bit, if nothing
1989 * happens, we are really hung so reset the bus.
1993 ESP_INTSON(esp
->dregs
);
1994 spin_unlock_irqrestore(&esp
->lock
, flags
);
1995 return SCSI_ABORT_SNOOZE
;
1998 /* We've sent ESP_CMD_RS to the ESP, the interrupt had just
1999 * arrived indicating the end of the SCSI bus reset. Our job
2000 * is to clean out the command queues and begin re-execution
2001 * of SCSI commands once more.
2003 static int esp_finish_reset(struct esp
*esp
)
2005 Scsi_Cmnd
*sp
= esp
->current_SC
;
2007 /* Clean up currently executing command, if any. */
2009 esp
->current_SC
= NULL
;
2010 spin_unlock(&esp
->lock
);
2012 esp_release_dmabufs(esp
, sp
);
2013 sp
->result
= (DID_RESET
<< 16);
2015 spin_lock(&io_request_lock
);
2017 spin_unlock(&io_request_lock
);
2019 spin_lock(&esp
->lock
);
2022 /* Clean up disconnected queue, they have been invalidated
2025 if (esp
->disconnected_SC
) {
2026 while ((sp
= remove_first_SC(&esp
->disconnected_SC
)) != NULL
) {
2027 spin_unlock(&esp
->lock
);
2029 esp_release_dmabufs(esp
, sp
);
2030 sp
->result
= (DID_RESET
<< 16);
2032 spin_lock(&io_request_lock
);
2034 spin_unlock(&io_request_lock
);
2036 spin_lock(&esp
->lock
);
2040 /* SCSI bus reset is complete. */
2041 esp
->resetting_bus
= 0;
2043 /* Ok, now it is safe to get commands going once more. */
2050 static int esp_do_resetbus(struct esp
*esp
)
2052 ESPLOG(("esp%d: Resetting scsi bus\n", esp
->esp_id
));
2053 esp
->resetting_bus
= 1;
2054 esp_cmd(esp
, ESP_CMD_RS
);
2059 /* Reset ESP chip, reset hanging bus, then kill active and
2060 * disconnected commands for targets without soft reset.
2062 int esp_reset(Scsi_Cmnd
*SCptr
, unsigned int how
)
2064 struct esp
*esp
= (struct esp
*) SCptr
->host
->hostdata
;
2065 unsigned long flags
;
2067 spin_lock_irqsave(&esp
->lock
, flags
);
2068 (void) esp_do_resetbus(esp
);
2069 spin_unlock_irqrestore(&esp
->lock
, flags
);
2071 return SCSI_RESET_PENDING
;
2074 /* Internal ESP done function. */
2075 static void esp_done(struct esp
*esp
, int error
)
2077 Scsi_Cmnd
*done_SC
= esp
->current_SC
;
2079 esp
->current_SC
= NULL
;
2081 spin_unlock(&esp
->lock
);
2082 esp_release_dmabufs(esp
, done_SC
);
2083 done_SC
->result
= error
;
2085 spin_lock(&io_request_lock
);
2086 done_SC
->scsi_done(done_SC
);
2087 spin_unlock(&io_request_lock
);
2089 /* Bus is free, issue any commands in the queue. */
2090 spin_lock(&esp
->lock
);
2091 if (esp
->issue_SC
&& !esp
->current_SC
)
2096 /* Wheee, ESP interrupt engine. */
2098 /* Forward declarations. */
2099 static int esp_do_phase_determine(struct esp
*esp
);
2100 static int esp_do_data_finale(struct esp
*esp
);
2101 static int esp_select_complete(struct esp
*esp
);
2102 static int esp_do_status(struct esp
*esp
);
2103 static int esp_do_msgin(struct esp
*esp
);
2104 static int esp_do_msgindone(struct esp
*esp
);
2105 static int esp_do_msgout(struct esp
*esp
);
2106 static int esp_do_cmdbegin(struct esp
*esp
);
2108 #define sreg_datainp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DIP)
2109 #define sreg_dataoutp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DOP)
2111 /* Read any bytes found in the FAS366 fifo, storing them into
2112 * the ESP driver software state structure.
2114 static void hme_fifo_read(struct esp
*esp
)
2117 u8 status
= esp
->sreg
;
2119 /* Cannot safely frob the fifo for these following cases, but
2120 * we must always read the fifo when the reselect interrupt
2123 if (((esp
->ireg
& ESP_INTR_RSEL
) == 0) &&
2124 (sreg_datainp(status
) ||
2125 sreg_dataoutp(status
) ||
2127 esp
->current_SC
->SCp
.phase
== in_data_done
))) {
2128 ESPHME(("<wkaround_skipped>"));
2130 unsigned long fcnt
= sbus_readb(esp
->eregs
+ ESP_FFLAGS
) & ESP_FF_FBYTES
;
2132 /* The HME stores bytes in multiples of 2 in the fifo. */
2133 ESPHME(("hme_fifo[fcnt=%d", (int)fcnt
));
2135 esp
->hme_fifo_workaround_buffer
[count
++] =
2136 sbus_readb(esp
->eregs
+ ESP_FDATA
);
2137 esp
->hme_fifo_workaround_buffer
[count
++] =
2138 sbus_readb(esp
->eregs
+ ESP_FDATA
);
2139 ESPHME(("<%02x,%02x>", esp
->hme_fifo_workaround_buffer
[count
-2], esp
->hme_fifo_workaround_buffer
[count
-1]));
2142 if (sbus_readb(esp
->eregs
+ ESP_STATUS2
) & ESP_STAT2_F1BYTE
) {
2143 ESPHME(("<poke_byte>"));
2144 sbus_writeb(0, esp
->eregs
+ ESP_FDATA
);
2145 esp
->hme_fifo_workaround_buffer
[count
++] =
2146 sbus_readb(esp
->eregs
+ ESP_FDATA
);
2147 ESPHME(("<%02x,0x00>", esp
->hme_fifo_workaround_buffer
[count
-1]));
2148 ESPHME(("CMD_FLUSH"));
2149 esp_cmd(esp
, ESP_CMD_FLUSH
);
2151 ESPHME(("no_xtra_byte"));
2154 ESPHME(("wkarnd_cnt=%d]", (int)count
));
2155 esp
->hme_fifo_workaround_count
= count
;
2158 static inline void hme_fifo_push(struct esp
*esp
, u8
*bytes
, u8 count
)
2160 esp_cmd(esp
, ESP_CMD_FLUSH
);
2163 sbus_writeb(tmp
, esp
->eregs
+ ESP_FDATA
);
2164 sbus_writeb(0, esp
->eregs
+ ESP_FDATA
);
2169 /* We try to avoid some interrupts by jumping ahead and see if the ESP
2170 * has gotten far enough yet. Hence the following.
2172 static inline int skipahead1(struct esp
*esp
, Scsi_Cmnd
*scp
,
2173 int prev_phase
, int new_phase
)
2175 if (scp
->SCp
.sent_command
!= prev_phase
)
2177 if (ESP_IRQ_P(esp
->dregs
)) {
2178 /* Yes, we are able to save an interrupt. */
2179 if (esp
->erev
== fashme
)
2180 esp
->sreg2
= sbus_readb(esp
->eregs
+ ESP_STATUS2
);
2181 esp
->sreg
= (sbus_readb(esp
->eregs
+ ESP_STATUS
) & ~(ESP_STAT_INTR
));
2182 esp
->ireg
= sbus_readb(esp
->eregs
+ ESP_INTRPT
);
2183 if (esp
->erev
== fashme
) {
2184 /* This chip is really losing. */
2186 /* Must latch fifo before reading the interrupt
2187 * register else garbage ends up in the FIFO
2188 * which confuses the driver utterly.
2189 * Happy Meal indeed....
2191 ESPHME(("fifo_workaround]"));
2192 if (!(esp
->sreg2
& ESP_STAT2_FEMPTY
) ||
2193 (esp
->sreg2
& ESP_STAT2_F1BYTE
))
2196 if (!(esp
->ireg
& ESP_INTR_SR
))
2199 return do_reset_complete
;
2201 /* Ho hum, target is taking forever... */
2202 scp
->SCp
.sent_command
= new_phase
; /* so we don't recurse... */
2206 static inline int skipahead2(struct esp
*esp
, Scsi_Cmnd
*scp
,
2207 int prev_phase1
, int prev_phase2
, int new_phase
)
2209 if (scp
->SCp
.sent_command
!= prev_phase1
&&
2210 scp
->SCp
.sent_command
!= prev_phase2
)
2212 if (ESP_IRQ_P(esp
->dregs
)) {
2213 /* Yes, we are able to save an interrupt. */
2214 if (esp
->erev
== fashme
)
2215 esp
->sreg2
= sbus_readb(esp
->eregs
+ ESP_STATUS2
);
2216 esp
->sreg
= (sbus_readb(esp
->eregs
+ ESP_STATUS
) & ~(ESP_STAT_INTR
));
2217 esp
->ireg
= sbus_readb(esp
->eregs
+ ESP_INTRPT
);
2218 if (esp
->erev
== fashme
) {
2219 /* This chip is really losing. */
2222 /* Must latch fifo before reading the interrupt
2223 * register else garbage ends up in the FIFO
2224 * which confuses the driver utterly.
2225 * Happy Meal indeed....
2227 ESPHME(("fifo_workaround]"));
2228 if (!(esp
->sreg2
& ESP_STAT2_FEMPTY
) ||
2229 (esp
->sreg2
& ESP_STAT2_F1BYTE
))
2232 if (!(esp
->ireg
& ESP_INTR_SR
))
2235 return do_reset_complete
;
2237 /* Ho hum, target is taking forever... */
2238 scp
->SCp
.sent_command
= new_phase
; /* so we don't recurse... */
2242 /* Now some dma helpers. */
2243 static void dma_setup(struct esp
*esp
, __u32 addr
, int count
, int write
)
2245 u32 nreg
= sbus_readl(esp
->dregs
+ DMA_CSR
);
2248 nreg
|= DMA_ST_WRITE
;
2250 nreg
&= ~(DMA_ST_WRITE
);
2252 sbus_writel(nreg
, esp
->dregs
+ DMA_CSR
);
2253 if (esp
->dma
->revision
== dvmaesc1
) {
2254 /* This ESC gate array sucks! */
2256 __u32 dest
= src
+ count
;
2258 if (dest
& (PAGE_SIZE
- 1))
2259 count
= PAGE_ALIGN(count
);
2260 sbus_writel(count
, esp
->dregs
+ DMA_COUNT
);
2262 sbus_writel(addr
, esp
->dregs
+ DMA_ADDR
);
2265 static void dma_drain(struct esp
*esp
)
2269 if (esp
->dma
->revision
== dvmahme
)
2271 if ((tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
)) & DMA_FIFO_ISDRAIN
) {
2272 switch (esp
->dma
->revision
) {
2274 tmp
|= DMA_FIFO_STDRAIN
;
2275 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
2279 while (sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_FIFO_ISDRAIN
)
2285 static void dma_invalidate(struct esp
*esp
)
2289 if (esp
->dma
->revision
== dvmahme
) {
2290 sbus_writel(DMA_RST_SCSI
, esp
->dregs
+ DMA_CSR
);
2292 esp
->prev_hme_dmacsr
= ((esp
->prev_hme_dmacsr
|
2293 (DMA_PARITY_OFF
| DMA_2CLKS
|
2294 DMA_SCSI_DISAB
| DMA_INT_ENAB
)) &
2295 ~(DMA_ST_WRITE
| DMA_ENABLE
));
2297 sbus_writel(0, esp
->dregs
+ DMA_CSR
);
2298 sbus_writel(esp
->prev_hme_dmacsr
, esp
->dregs
+ DMA_CSR
);
2300 /* This is necessary to avoid having the SCSI channel
2301 * engine lock up on us.
2303 sbus_writel(0, esp
->dregs
+ DMA_ADDR
);
2305 while ((tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
)) & DMA_PEND_READ
)
2308 tmp
&= ~(DMA_ENABLE
| DMA_ST_WRITE
| DMA_BCNT_ENAB
);
2309 tmp
|= DMA_FIFO_INV
;
2310 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
2311 tmp
&= ~DMA_FIFO_INV
;
2312 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
2316 static inline void dma_flashclear(struct esp
*esp
)
2319 dma_invalidate(esp
);
2322 static int dma_can_transfer(struct esp
*esp
, Scsi_Cmnd
*sp
)
2324 __u32 base
, end
, sz
;
2326 if (esp
->dma
->revision
== dvmarev3
) {
2327 sz
= sp
->SCp
.this_residual
;
2331 base
= ((__u32
)((unsigned long)sp
->SCp
.ptr
));
2332 base
&= (0x1000000 - 1);
2333 end
= (base
+ sp
->SCp
.this_residual
);
2334 if (end
> 0x1000000)
2341 /* Misc. esp helper macros. */
2342 #define esp_setcount(__eregs, __cnt, __hme) \
2343 sbus_writeb(((__cnt)&0xff), (__eregs) + ESP_TCLOW); \
2344 sbus_writeb((((__cnt)>>8)&0xff), (__eregs) + ESP_TCMED); \
2346 sbus_writeb((((__cnt)>>16)&0xff), (__eregs) + FAS_RLO); \
2347 sbus_writeb(0, (__eregs) + FAS_RHI); \
2350 #define esp_getcount(__eregs, __hme) \
2351 ((sbus_readb((__eregs) + ESP_TCLOW)&0xff) | \
2352 ((sbus_readb((__eregs) + ESP_TCMED)&0xff) << 8) | \
2353 ((__hme) ? sbus_readb((__eregs) + FAS_RLO) << 16 : 0))
2355 #define fcount(__esp) \
2356 (((__esp)->erev == fashme) ? \
2357 (__esp)->hme_fifo_workaround_count : \
2358 sbus_readb(((__esp)->eregs) + ESP_FFLAGS) & ESP_FF_FBYTES)
2360 #define fnzero(__esp) \
2361 (((__esp)->erev == fashme) ? 0 : \
2362 sbus_readb(((__esp)->eregs) + ESP_FFLAGS) & ESP_FF_ONOTZERO)
2364 /* XXX speculative nops unnecessary when continuing amidst a data phase
2365 * XXX even on esp100!!! another case of flooding the bus with I/O reg
2368 #define esp_maybe_nop(__esp) \
2369 if ((__esp)->erev == esp100) \
2370 esp_cmd((__esp), ESP_CMD_NULL)
2372 #define sreg_to_dataphase(__sreg) \
2373 ((((__sreg) & ESP_STAT_PMASK) == ESP_DOP) ? in_dataout : in_datain)
2375 /* The ESP100 when in synchronous data phase, can mistake a long final
2376 * REQ pulse from the target as an extra byte, it places whatever is on
2377 * the data lines into the fifo. For now, we will assume when this
2378 * happens that the target is a bit quirky and we don't want to
2379 * be talking synchronously to it anyways. Regardless, we need to
2380 * tell the ESP to eat the extraneous byte so that we can proceed
2381 * to the next phase.
2383 static int esp100_sync_hwbug(struct esp
*esp
, Scsi_Cmnd
*sp
, int fifocnt
)
2385 /* Do not touch this piece of code. */
2386 if ((!(esp
->erev
== esp100
)) ||
2387 (!(sreg_datainp((esp
->sreg
= sbus_readb(esp
->eregs
+ ESP_STATUS
))) &&
2389 !(sreg_dataoutp(esp
->sreg
) && !fnzero(esp
)))) {
2390 if (sp
->SCp
.phase
== in_dataout
)
2391 esp_cmd(esp
, ESP_CMD_FLUSH
);
2394 /* Async mode for this guy. */
2395 build_sync_nego_msg(esp
, 0, 0);
2397 /* Ack the bogus byte, but set ATN first. */
2398 esp_cmd(esp
, ESP_CMD_SATN
);
2399 esp_cmd(esp
, ESP_CMD_MOK
);
2404 /* This closes the window during a selection with a reselect pending, because
2405 * we use DMA for the selection process the FIFO should hold the correct
2406 * contents if we get reselected during this process. So we just need to
2407 * ack the possible illegal cmd interrupt pending on the esp100.
2409 static inline int esp100_reconnect_hwbug(struct esp
*esp
)
2413 if (esp
->erev
!= esp100
)
2415 tmp
= sbus_readb(esp
->eregs
+ ESP_INTRPT
);
2416 if (tmp
& ESP_INTR_SR
)
2421 /* This verifies the BUSID bits during a reselection so that we know which
2422 * target is talking to us.
2424 static inline int reconnect_target(struct esp
*esp
)
2426 int it
, me
= esp
->scsi_id_mask
, targ
= 0;
2428 if (2 != fcount(esp
))
2430 if (esp
->erev
== fashme
) {
2431 /* HME does not latch it's own BUS ID bits during
2432 * a reselection. Also the target number is given
2433 * as an unsigned char, not as a sole bit number
2434 * like the other ESP's do.
2435 * Happy Meal indeed....
2437 targ
= esp
->hme_fifo_workaround_buffer
[0];
2439 it
= sbus_readb(esp
->eregs
+ ESP_FDATA
);
2451 /* This verifies the identify from the target so that we know which lun is
2452 * being reconnected.
2454 static inline int reconnect_lun(struct esp
*esp
)
2458 if ((esp
->sreg
& ESP_STAT_PMASK
) != ESP_MIP
)
2460 if (esp
->erev
== fashme
)
2461 lun
= esp
->hme_fifo_workaround_buffer
[1];
2463 lun
= sbus_readb(esp
->eregs
+ ESP_FDATA
);
2465 /* Yes, you read this correctly. We report lun of zero
2466 * if we see parity error. ESP reports parity error for
2467 * the lun byte, and this is the only way to hope to recover
2468 * because the target is connected.
2470 if (esp
->sreg
& ESP_STAT_PERR
)
2473 /* Check for illegal bits being set in the lun. */
2474 if ((lun
& 0x40) || !(lun
& 0x80))
2480 /* This puts the driver in a state where it can revitalize a command that
2481 * is being continued due to reselection.
2483 static inline void esp_connect(struct esp
*esp
, Scsi_Cmnd
*sp
)
2485 Scsi_Device
*dp
= sp
->device
;
2487 if (esp
->prev_soff
!= dp
->sync_max_offset
||
2488 esp
->prev_stp
!= dp
->sync_min_period
||
2489 (esp
->erev
> esp100a
&&
2490 esp
->prev_cfg3
!= esp
->config3
[sp
->target
])) {
2491 esp
->prev_soff
= dp
->sync_max_offset
;
2492 esp
->prev_stp
= dp
->sync_min_period
;
2493 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
2494 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
2495 if (esp
->erev
> esp100a
) {
2496 esp
->prev_cfg3
= esp
->config3
[sp
->target
];
2497 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
2500 esp
->current_SC
= sp
;
2503 /* This will place the current working command back into the issue queue
2504 * if we are to receive a reselection amidst a selection attempt.
2506 static inline void esp_reconnect(struct esp
*esp
, Scsi_Cmnd
*sp
)
2508 if (!esp
->disconnected_SC
)
2509 ESPLOG(("esp%d: Weird, being reselected but disconnected "
2510 "command queue is empty.\n", esp
->esp_id
));
2512 esp
->current_SC
= 0;
2513 sp
->SCp
.phase
= not_issued
;
2514 append_SC(&esp
->issue_SC
, sp
);
2517 /* Begin message in phase. */
2518 static int esp_do_msgin(struct esp
*esp
)
2520 /* Must be very careful with the fifo on the HME */
2521 if ((esp
->erev
!= fashme
) ||
2522 !(sbus_readb(esp
->eregs
+ ESP_STATUS2
) & ESP_STAT2_FEMPTY
))
2523 esp_cmd(esp
, ESP_CMD_FLUSH
);
2525 esp_cmd(esp
, ESP_CMD_TI
);
2528 esp_advance_phase(esp
->current_SC
, in_msgindone
);
2532 /* This uses various DMA csr fields and the fifo flags count value to
2533 * determine how many bytes were successfully sent/received by the ESP.
2535 static inline int esp_bytes_sent(struct esp
*esp
, int fifo_count
)
2537 int rval
= sbus_readl(esp
->dregs
+ DMA_ADDR
) - esp
->esp_command_dvma
;
2539 if (esp
->dma
->revision
== dvmarev1
)
2540 rval
-= (4 - ((sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_READ_AHEAD
)>>11));
2541 return rval
- fifo_count
;
2544 static inline void advance_sg(Scsi_Cmnd
*sp
)
2547 --sp
->SCp
.buffers_residual
;
2548 sp
->SCp
.this_residual
= sg_dma_len(sp
->SCp
.buffer
);
2549 sp
->SCp
.ptr
= (char *)((unsigned long)sg_dma_address(sp
->SCp
.buffer
));
2552 /* Please note that the way I've coded these routines is that I _always_
2553 * check for a disconnect during any and all information transfer
2554 * phases. The SCSI standard states that the target _can_ cause a BUS
2555 * FREE condition by dropping all MSG/CD/IO/BSY signals. Also note
2556 * that during information transfer phases the target controls every
2557 * change in phase, the only thing the initiator can do is "ask" for
2558 * a message out phase by driving ATN true. The target can, and sometimes
2559 * will, completely ignore this request so we cannot assume anything when
2560 * we try to force a message out phase to abort/reset a target. Most of
2561 * the time the target will eventually be nice and go to message out, so
2562 * we may have to hold on to our state about what we want to tell the target
2563 * for some period of time.
2566 /* I think I have things working here correctly. Even partial transfers
2567 * within a buffer or sub-buffer should not upset us at all no matter
2568 * how bad the target and/or ESP fucks things up.
2570 static int esp_do_data(struct esp
*esp
)
2572 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
2573 int thisphase
, hmuch
;
2575 ESPDATA(("esp_do_data: "));
2577 thisphase
= sreg_to_dataphase(esp
->sreg
);
2578 esp_advance_phase(SCptr
, thisphase
);
2579 ESPDATA(("newphase<%s> ", (thisphase
== in_datain
) ? "DATAIN" : "DATAOUT"));
2580 hmuch
= dma_can_transfer(esp
, SCptr
);
2581 ESPDATA(("hmuch<%d> ", hmuch
));
2582 esp
->current_transfer_size
= hmuch
;
2584 if (esp
->erev
== fashme
) {
2585 u32 tmp
= esp
->prev_hme_dmacsr
;
2587 /* Always set the ESP count registers first. */
2588 esp_setcount(esp
->eregs
, hmuch
, 1);
2590 /* Get the DMA csr computed. */
2591 tmp
|= (DMA_SCSI_DISAB
| DMA_ENABLE
);
2592 if (thisphase
== in_datain
)
2593 tmp
|= DMA_ST_WRITE
;
2595 tmp
&= ~(DMA_ST_WRITE
);
2596 esp
->prev_hme_dmacsr
= tmp
;
2598 ESPDATA(("DMA|TI --> do_intr_end\n"));
2599 if (thisphase
== in_datain
) {
2600 sbus_writel(hmuch
, esp
->dregs
+ DMA_COUNT
);
2601 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
2603 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
2604 sbus_writel(hmuch
, esp
->dregs
+ DMA_COUNT
);
2606 sbus_writel((__u32
)((unsigned long)SCptr
->SCp
.ptr
), esp
->dregs
+DMA_ADDR
);
2607 sbus_writel(esp
->prev_hme_dmacsr
, esp
->dregs
+ DMA_CSR
);
2609 esp_setcount(esp
->eregs
, hmuch
, 0);
2610 dma_setup(esp
, ((__u32
)((unsigned long)SCptr
->SCp
.ptr
)),
2611 hmuch
, (thisphase
== in_datain
));
2612 ESPDATA(("DMA|TI --> do_intr_end\n"));
2613 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
2618 /* See how successful the data transfer was. */
2619 static int esp_do_data_finale(struct esp
*esp
)
2621 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
2622 int bogus_data
= 0, bytes_sent
= 0, fifocnt
, ecount
= 0;
2624 ESPDATA(("esp_do_data_finale: "));
2626 if (SCptr
->SCp
.phase
== in_datain
) {
2627 if (esp
->sreg
& ESP_STAT_PERR
) {
2628 /* Yuck, parity error. The ESP asserts ATN
2629 * so that we can go to message out phase
2630 * immediately and inform the target that
2631 * something bad happened.
2633 ESPLOG(("esp%d: data bad parity detected.\n",
2635 esp
->cur_msgout
[0] = INITIATOR_ERROR
;
2636 esp
->msgout_len
= 1;
2640 dma_invalidate(esp
);
2642 /* This could happen for the above parity error case. */
2643 if (esp
->ireg
!= ESP_INTR_BSERV
) {
2644 /* Please go to msgout phase, please please please... */
2645 ESPLOG(("esp%d: !BSERV after data, probably to msgout\n",
2647 return esp_do_phase_determine(esp
);
2650 /* Check for partial transfers and other horrible events.
2651 * Note, here we read the real fifo flags register even
2652 * on HME broken adapters because we skip the HME fifo
2653 * workaround code in esp_handle() if we are doing data
2654 * phase things. We don't want to fuck directly with
2655 * the fifo like that, especially if doing syncronous
2656 * transfers! Also, will need to double the count on
2657 * HME if we are doing wide transfers, as the HME fifo
2658 * will move and count 16-bit quantities during wide data.
2659 * SMCC _and_ Qlogic can both bite me.
2661 fifocnt
= (sbus_readb(esp
->eregs
+ ESP_FFLAGS
) & ESP_FF_FBYTES
);
2662 if (esp
->erev
!= fashme
)
2663 ecount
= esp_getcount(esp
->eregs
, 0);
2664 bytes_sent
= esp
->current_transfer_size
;
2666 ESPDATA(("trans_sz(%d), ", bytes_sent
));
2667 if (esp
->erev
== fashme
) {
2668 if (!(esp
->sreg
& ESP_STAT_TCNT
)) {
2669 ecount
= esp_getcount(esp
->eregs
, 1);
2670 bytes_sent
-= ecount
;
2673 /* Always subtract any cruft remaining in the FIFO. */
2674 if (esp
->prev_cfg3
& ESP_CONFIG3_EWIDE
)
2676 if (SCptr
->SCp
.phase
== in_dataout
)
2677 bytes_sent
-= fifocnt
;
2679 /* I have an IBM disk which exhibits the following
2680 * behavior during writes to it. It disconnects in
2681 * the middle of a partial transfer, the current sglist
2682 * buffer is 1024 bytes, the disk stops data transfer
2685 * However the FAS366 reports that 32 more bytes were
2686 * transferred than really were. This is precisely
2687 * the size of a fully loaded FIFO in wide scsi mode.
2688 * The FIFO state recorded indicates that it is empty.
2690 * I have no idea if this is a bug in the FAS366 chip
2691 * or a bug in the firmware on this IBM disk. In any
2692 * event the following seems to be a good workaround. -DaveM
2694 if (bytes_sent
!= esp
->current_transfer_size
&&
2695 SCptr
->SCp
.phase
== in_dataout
) {
2696 int mask
= (64 - 1);
2698 if ((esp
->prev_cfg3
& ESP_CONFIG3_EWIDE
) == 0)
2701 if (bytes_sent
& mask
)
2702 bytes_sent
-= (bytes_sent
& mask
);
2705 if (!(esp
->sreg
& ESP_STAT_TCNT
))
2706 bytes_sent
-= ecount
;
2707 if (SCptr
->SCp
.phase
== in_dataout
)
2708 bytes_sent
-= fifocnt
;
2711 ESPDATA(("bytes_sent(%d), ", bytes_sent
));
2713 /* If we were in synchronous mode, check for peculiarities. */
2714 if (esp
->erev
== fashme
) {
2715 if (SCptr
->device
->sync_max_offset
) {
2716 if (SCptr
->SCp
.phase
== in_dataout
)
2717 esp_cmd(esp
, ESP_CMD_FLUSH
);
2719 esp_cmd(esp
, ESP_CMD_FLUSH
);
2722 if (SCptr
->device
->sync_max_offset
)
2723 bogus_data
= esp100_sync_hwbug(esp
, SCptr
, fifocnt
);
2725 esp_cmd(esp
, ESP_CMD_FLUSH
);
2728 /* Until we are sure of what has happened, we are certainly
2731 esp_advance_phase(SCptr
, in_the_dark
);
2733 if (bytes_sent
< 0) {
2734 /* I've seen this happen due to lost state in this
2735 * driver. No idea why it happened, but allowing
2736 * this value to be negative caused things to
2737 * lock up. This allows greater chance of recovery.
2738 * In fact every time I've seen this, it has been
2739 * a driver bug without question.
2741 ESPLOG(("esp%d: yieee, bytes_sent < 0!\n", esp
->esp_id
));
2742 ESPLOG(("esp%d: csz=%d fifocount=%d ecount=%d\n",
2744 esp
->current_transfer_size
, fifocnt
, ecount
));
2745 ESPLOG(("esp%d: use_sg=%d ptr=%p this_residual=%d\n",
2747 SCptr
->use_sg
, SCptr
->SCp
.ptr
, SCptr
->SCp
.this_residual
));
2748 ESPLOG(("esp%d: Forcing async for target %d\n", esp
->esp_id
,
2750 SCptr
->device
->borken
= 1;
2751 SCptr
->device
->sync
= 0;
2755 /* Update the state of our transfer. */
2756 SCptr
->SCp
.ptr
+= bytes_sent
;
2757 SCptr
->SCp
.this_residual
-= bytes_sent
;
2758 if (SCptr
->SCp
.this_residual
< 0) {
2760 ESPLOG(("esp%d: Data transfer overrun.\n", esp
->esp_id
));
2761 SCptr
->SCp
.this_residual
= 0;
2764 /* Maybe continue. */
2766 ESPDATA(("!bogus_data, "));
2768 /* NO MATTER WHAT, we advance the scatterlist,
2769 * if the target should decide to disconnect
2770 * in between scatter chunks (which is common)
2771 * we could die horribly! I used to have the sg
2772 * advance occur only if we are going back into
2773 * (or are staying in) a data phase, you can
2774 * imagine the hell I went through trying to
2777 if (SCptr
->use_sg
&& !SCptr
->SCp
.this_residual
)
2779 if (sreg_datainp(esp
->sreg
) || sreg_dataoutp(esp
->sreg
)) {
2780 ESPDATA(("to more data\n"));
2781 return esp_do_data(esp
);
2783 ESPDATA(("to new phase\n"));
2784 return esp_do_phase_determine(esp
);
2786 /* Bogus data, just wait for next interrupt. */
2787 ESPLOG(("esp%d: bogus_data during end of data phase\n",
2792 /* We received a non-good status return at the end of
2793 * running a SCSI command. This is used to decide if
2794 * we should clear our synchronous transfer state for
2795 * such a device when that happens.
2797 * The idea is that when spinning up a disk or rewinding
2798 * a tape, we don't want to go into a loop re-negotiating
2799 * synchronous capabilities over and over.
2801 static int esp_should_clear_sync(Scsi_Cmnd
*sp
)
2803 u8 cmd1
= sp
->cmnd
[0];
2804 u8 cmd2
= sp
->data_cmnd
[0];
2806 /* These cases are for spinning up a disk and
2807 * waiting for that spinup to complete.
2809 if (cmd1
== START_STOP
||
2813 if (cmd1
== TEST_UNIT_READY
||
2814 cmd2
== TEST_UNIT_READY
)
2817 /* One more special case for SCSI tape drives,
2818 * this is what is used to probe the device for
2819 * completion of a rewind or tape load operation.
2821 if (sp
->device
->type
== TYPE_TAPE
) {
2822 if (cmd1
== MODE_SENSE
||
2830 /* Either a command is completing or a target is dropping off the bus
2831 * to continue the command in the background so we can do other work.
2833 static int esp_do_freebus(struct esp
*esp
)
2835 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
2838 rval
= skipahead2(esp
, SCptr
, in_status
, in_msgindone
, in_freeing
);
2841 if (esp
->ireg
!= ESP_INTR_DC
) {
2842 ESPLOG(("esp%d: Target will not disconnect\n", esp
->esp_id
));
2843 return do_reset_bus
; /* target will not drop BSY... */
2845 esp
->msgout_len
= 0;
2846 esp
->prevmsgout
= NOP
;
2847 if (esp
->prevmsgin
== COMMAND_COMPLETE
) {
2848 /* Normal end of nexus. */
2849 if (esp
->disconnected_SC
|| (esp
->erev
== fashme
))
2850 esp_cmd(esp
, ESP_CMD_ESEL
);
2852 if (SCptr
->SCp
.Status
!= GOOD
&&
2853 SCptr
->SCp
.Status
!= CONDITION_GOOD
&&
2854 ((1<<SCptr
->target
) & esp
->targets_present
) &&
2855 SCptr
->device
->sync
&&
2856 SCptr
->device
->sync_max_offset
) {
2857 /* SCSI standard says that the synchronous capabilities
2858 * should be renegotiated at this point. Most likely
2859 * we are about to request sense from this target
2860 * in which case we want to avoid using sync
2861 * transfers until we are sure of the current target
2864 ESPMISC(("esp: Status <%d> for target %d lun %d\n",
2865 SCptr
->SCp
.Status
, SCptr
->target
, SCptr
->lun
));
2867 /* But don't do this when spinning up a disk at
2868 * boot time while we poll for completion as it
2869 * fills up the console with messages. Also, tapes
2870 * can report not ready many times right after
2871 * loading up a tape.
2873 if (esp_should_clear_sync(SCptr
) != 0)
2874 SCptr
->device
->sync
= 0;
2876 ESPDISC(("F<%02x,%02x>", SCptr
->target
, SCptr
->lun
));
2877 esp_done(esp
, ((SCptr
->SCp
.Status
& 0xff) |
2878 ((SCptr
->SCp
.Message
& 0xff)<<8) |
2880 } else if (esp
->prevmsgin
== DISCONNECT
) {
2881 /* Normal disconnect. */
2882 esp_cmd(esp
, ESP_CMD_ESEL
);
2883 ESPDISC(("D<%02x,%02x>", SCptr
->target
, SCptr
->lun
));
2884 append_SC(&esp
->disconnected_SC
, SCptr
);
2885 esp
->current_SC
= NULL
;
2889 /* Driver bug, we do not expect a disconnect here
2890 * and should not have advanced the state engine
2893 ESPLOG(("esp%d: last msg not disc and not cmd cmplt.\n",
2895 return do_reset_bus
;
2900 /* When a reselect occurs, and we cannot find the command to
2901 * reconnect to in our queues, we do this.
2903 static int esp_bad_reconnect(struct esp
*esp
)
2907 ESPLOG(("esp%d: Eieeee, reconnecting unknown command!\n",
2909 ESPLOG(("QUEUE DUMP\n"));
2911 ESPLOG(("esp%d: issue_SC[", esp
->esp_id
));
2913 ESPLOG(("<%02x,%02x>", sp
->target
, sp
->lun
));
2914 sp
= (Scsi_Cmnd
*) sp
->host_scribble
;
2917 sp
= esp
->current_SC
;
2918 ESPLOG(("esp%d: current_SC[", esp
->esp_id
));
2920 ESPLOG(("<%02x,%02x>", sp
->target
, sp
->lun
));
2924 sp
= esp
->disconnected_SC
;
2925 ESPLOG(("esp%d: disconnected_SC[", esp
->esp_id
));
2927 ESPLOG(("<%02x,%02x>", sp
->target
, sp
->lun
));
2928 sp
= (Scsi_Cmnd
*) sp
->host_scribble
;
2931 return do_reset_bus
;
2934 /* Do the needy when a target tries to reconnect to us. */
2935 static int esp_do_reconnect(struct esp
*esp
)
2940 /* Check for all bogus conditions first. */
2941 target
= reconnect_target(esp
);
2943 ESPDISC(("bad bus bits\n"));
2944 return do_reset_bus
;
2946 lun
= reconnect_lun(esp
);
2948 ESPDISC(("target=%2x, bad identify msg\n", target
));
2949 return do_reset_bus
;
2952 /* Things look ok... */
2953 ESPDISC(("R<%02x,%02x>", target
, lun
));
2955 /* Must not flush FIFO or DVMA on HME. */
2956 if (esp
->erev
!= fashme
) {
2957 esp_cmd(esp
, ESP_CMD_FLUSH
);
2958 if (esp100_reconnect_hwbug(esp
))
2959 return do_reset_bus
;
2960 esp_cmd(esp
, ESP_CMD_NULL
);
2963 SCptr
= remove_SC(&esp
->disconnected_SC
, (u8
) target
, (u8
) lun
);
2965 return esp_bad_reconnect(esp
);
2967 esp_connect(esp
, SCptr
);
2968 esp_cmd(esp
, ESP_CMD_MOK
);
2970 if (esp
->erev
== fashme
)
2971 sbus_writeb(((SCptr
->target
& 0xf) |
2972 (ESP_BUSID_RESELID
| ESP_BUSID_CTR32BIT
)),
2973 esp
->eregs
+ ESP_BUSID
);
2975 /* Reconnect implies a restore pointers operation. */
2976 esp_restore_pointers(esp
, SCptr
);
2979 esp_advance_phase(SCptr
, in_the_dark
);
2983 /* End of NEXUS (hopefully), pick up status + message byte then leave if
2986 static int esp_do_status(struct esp
*esp
)
2988 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
2991 rval
= skipahead1(esp
, SCptr
, in_the_dark
, in_status
);
2995 ESPSTAT(("esp_do_status: "));
2996 if (intr
!= ESP_INTR_DC
) {
2997 int message_out
= 0; /* for parity problems */
2999 /* Ack the message. */
3000 ESPSTAT(("ack msg, "));
3001 esp_cmd(esp
, ESP_CMD_MOK
);
3003 if (esp
->erev
!= fashme
) {
3004 dma_flashclear(esp
);
3006 /* Wait till the first bits settle. */
3007 while (esp
->esp_command
[0] == 0xff)
3010 esp
->esp_command
[0] = esp
->hme_fifo_workaround_buffer
[0];
3011 esp
->esp_command
[1] = esp
->hme_fifo_workaround_buffer
[1];
3014 ESPSTAT(("got something, "));
3015 /* ESP chimes in with one of
3017 * 1) function done interrupt:
3018 * both status and message in bytes
3021 * 2) bus service interrupt:
3022 * only status byte was acquired
3025 * can't happen, but we test for it
3028 * ALSO: If bad parity was detected on either
3029 * the status _or_ the message byte then
3030 * the ESP has asserted ATN on the bus
3031 * and we must therefore wait for the
3032 * next phase change.
3034 if (intr
& ESP_INTR_FDONE
) {
3035 /* We got it all, hallejulia. */
3036 ESPSTAT(("got both, "));
3037 SCptr
->SCp
.Status
= esp
->esp_command
[0];
3038 SCptr
->SCp
.Message
= esp
->esp_command
[1];
3039 esp
->prevmsgin
= SCptr
->SCp
.Message
;
3040 esp
->cur_msgin
[0] = SCptr
->SCp
.Message
;
3041 if (esp
->sreg
& ESP_STAT_PERR
) {
3042 /* There was bad parity for the
3043 * message byte, the status byte
3046 message_out
= MSG_PARITY_ERROR
;
3048 } else if (intr
== ESP_INTR_BSERV
) {
3049 /* Only got status byte. */
3050 ESPLOG(("esp%d: got status only, ", esp
->esp_id
));
3051 if (!(esp
->sreg
& ESP_STAT_PERR
)) {
3052 SCptr
->SCp
.Status
= esp
->esp_command
[0];
3053 SCptr
->SCp
.Message
= 0xff;
3055 /* The status byte had bad parity.
3056 * we leave the scsi_pointer Status
3057 * field alone as we set it to a default
3058 * of CHECK_CONDITION in esp_queue.
3060 message_out
= INITIATOR_ERROR
;
3063 /* This shouldn't happen ever. */
3064 ESPSTAT(("got bolixed\n"));
3065 esp_advance_phase(SCptr
, in_the_dark
);
3066 return esp_do_phase_determine(esp
);
3070 ESPSTAT(("status=%2x msg=%2x, ", SCptr
->SCp
.Status
,
3071 SCptr
->SCp
.Message
));
3072 if (SCptr
->SCp
.Message
== COMMAND_COMPLETE
) {
3073 ESPSTAT(("and was COMMAND_COMPLETE\n"));
3074 esp_advance_phase(SCptr
, in_freeing
);
3075 return esp_do_freebus(esp
);
3077 ESPLOG(("esp%d: and _not_ COMMAND_COMPLETE\n",
3079 esp
->msgin_len
= esp
->msgin_ctr
= 1;
3080 esp_advance_phase(SCptr
, in_msgindone
);
3081 return esp_do_msgindone(esp
);
3084 /* With luck we'll be able to let the target
3085 * know that bad parity happened, it will know
3086 * which byte caused the problems and send it
3087 * again. For the case where the status byte
3088 * receives bad parity, I do not believe most
3089 * targets recover very well. We'll see.
3091 ESPLOG(("esp%d: bad parity somewhere mout=%2x\n",
3092 esp
->esp_id
, message_out
));
3093 esp
->cur_msgout
[0] = message_out
;
3094 esp
->msgout_len
= esp
->msgout_ctr
= 1;
3095 esp_advance_phase(SCptr
, in_the_dark
);
3096 return esp_do_phase_determine(esp
);
3099 /* If we disconnect now, all hell breaks loose. */
3100 ESPLOG(("esp%d: whoops, disconnect\n", esp
->esp_id
));
3101 esp_advance_phase(SCptr
, in_the_dark
);
3102 return esp_do_phase_determine(esp
);
3106 static int esp_enter_status(struct esp
*esp
)
3108 u8 thecmd
= ESP_CMD_ICCSEQ
;
3110 esp_cmd(esp
, ESP_CMD_FLUSH
);
3111 if (esp
->erev
!= fashme
) {
3114 esp
->esp_command
[0] = esp
->esp_command
[1] = 0xff;
3115 sbus_writeb(2, esp
->eregs
+ ESP_TCLOW
);
3116 sbus_writeb(0, esp
->eregs
+ ESP_TCMED
);
3117 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
3118 tmp
|= (DMA_ST_WRITE
| DMA_ENABLE
);
3119 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
3120 if (esp
->dma
->revision
== dvmaesc1
)
3121 sbus_writel(0x100, esp
->dregs
+ DMA_COUNT
);
3122 sbus_writel(esp
->esp_command_dvma
, esp
->dregs
+ DMA_ADDR
);
3123 thecmd
|= ESP_CMD_DMA
;
3125 esp_cmd(esp
, thecmd
);
3126 esp_advance_phase(esp
->current_SC
, in_status
);
3128 return esp_do_status(esp
);
3131 static int esp_disconnect_amidst_phases(struct esp
*esp
)
3133 Scsi_Cmnd
*sp
= esp
->current_SC
;
3134 Scsi_Device
*dp
= sp
->device
;
3136 /* This means real problems if we see this
3137 * here. Unless we were actually trying
3138 * to force the device to abort/reset.
3140 ESPLOG(("esp%d Disconnect amidst phases, ", esp
->esp_id
));
3141 ESPLOG(("pphase<%s> cphase<%s>, ",
3142 phase_string(sp
->SCp
.phase
),
3143 phase_string(sp
->SCp
.sent_command
)));
3145 if (esp
->disconnected_SC
!= NULL
|| (esp
->erev
== fashme
))
3146 esp_cmd(esp
, ESP_CMD_ESEL
);
3148 switch (esp
->cur_msgout
[0]) {
3150 /* We didn't expect this to happen at all. */
3151 ESPLOG(("device is bolixed\n"));
3152 esp_advance_phase(sp
, in_tgterror
);
3153 esp_done(esp
, (DID_ERROR
<< 16));
3156 case BUS_DEVICE_RESET
:
3157 ESPLOG(("device reset successful\n"));
3158 dp
->sync_max_offset
= 0;
3159 dp
->sync_min_period
= 0;
3161 esp_advance_phase(sp
, in_resetdev
);
3162 esp_done(esp
, (DID_RESET
<< 16));
3166 ESPLOG(("device abort successful\n"));
3167 esp_advance_phase(sp
, in_abortone
);
3168 esp_done(esp
, (DID_ABORT
<< 16));
3175 static int esp_enter_msgout(struct esp
*esp
)
3177 esp_advance_phase(esp
->current_SC
, in_msgout
);
3178 return esp_do_msgout(esp
);
3181 static int esp_enter_msgin(struct esp
*esp
)
3183 esp_advance_phase(esp
->current_SC
, in_msgin
);
3184 return esp_do_msgin(esp
);
3187 static int esp_enter_cmd(struct esp
*esp
)
3189 esp_advance_phase(esp
->current_SC
, in_cmdbegin
);
3190 return esp_do_cmdbegin(esp
);
3193 static int esp_enter_badphase(struct esp
*esp
)
3195 ESPLOG(("esp%d: Bizarre bus phase %2x.\n", esp
->esp_id
,
3196 esp
->sreg
& ESP_STAT_PMASK
));
3197 return do_reset_bus
;
3200 typedef int (*espfunc_t
)(struct esp
*);
3202 static espfunc_t phase_vector
[] = {
3203 esp_do_data
, /* ESP_DOP */
3204 esp_do_data
, /* ESP_DIP */
3205 esp_enter_cmd
, /* ESP_CMDP */
3206 esp_enter_status
, /* ESP_STATP */
3207 esp_enter_badphase
, /* ESP_STAT_PMSG */
3208 esp_enter_badphase
, /* ESP_STAT_PMSG | ESP_STAT_PIO */
3209 esp_enter_msgout
, /* ESP_MOP */
3210 esp_enter_msgin
, /* ESP_MIP */
3213 /* The target has control of the bus and we have to see where it has
3216 static int esp_do_phase_determine(struct esp
*esp
)
3218 if ((esp
->ireg
& ESP_INTR_DC
) != 0)
3219 return esp_disconnect_amidst_phases(esp
);
3220 return phase_vector
[esp
->sreg
& ESP_STAT_PMASK
](esp
);
3223 /* First interrupt after exec'ing a cmd comes here. */
3224 static int esp_select_complete(struct esp
*esp
)
3226 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
3227 Scsi_Device
*SDptr
= SCptr
->device
;
3228 int cmd_bytes_sent
, fcnt
;
3230 if (esp
->erev
!= fashme
)
3231 esp
->seqreg
= (sbus_readb(esp
->eregs
+ ESP_SSTEP
) & ESP_STEP_VBITS
);
3233 if (esp
->erev
== fashme
)
3234 fcnt
= esp
->hme_fifo_workaround_count
;
3236 fcnt
= (sbus_readb(esp
->eregs
+ ESP_FFLAGS
) & ESP_FF_FBYTES
);
3238 cmd_bytes_sent
= esp_bytes_sent(esp
, fcnt
);
3239 dma_invalidate(esp
);
3241 /* Let's check to see if a reselect happened
3242 * while we we're trying to select. This must
3245 if (esp
->ireg
== (ESP_INTR_RSEL
| ESP_INTR_FDONE
)) {
3246 esp_reconnect(esp
, SCptr
);
3247 return esp_do_reconnect(esp
);
3250 /* Looks like things worked, we should see a bus service &
3251 * a function complete interrupt at this point. Note we
3252 * are doing a direct comparison because we don't want to
3253 * be fooled into thinking selection was successful if
3254 * ESP_INTR_DC is set, see below.
3256 if (esp
->ireg
== (ESP_INTR_FDONE
| ESP_INTR_BSERV
)) {
3257 /* target speaks... */
3258 esp
->targets_present
|= (1<<SCptr
->target
);
3260 /* What if the target ignores the sdtr? */
3264 /* See how far, if at all, we got in getting
3265 * the information out to the target.
3267 switch (esp
->seqreg
) {
3271 /* Arbitration won, target selected, but
3272 * we are in some phase which is not command
3273 * phase nor is it message out phase.
3275 * XXX We've confused the target, obviously.
3276 * XXX So clear it's state, but we also end
3277 * XXX up clearing everyone elses. That isn't
3278 * XXX so nice. I'd like to just reset this
3279 * XXX target, but if I cannot even get it's
3280 * XXX attention and finish selection to talk
3281 * XXX to it, there is not much more I can do.
3282 * XXX If we have a loaded bus we're going to
3283 * XXX spend the next second or so renegotiating
3284 * XXX for synchronous transfers.
3286 ESPLOG(("esp%d: STEP_ASEL for tgt %d\n",
3287 esp
->esp_id
, SCptr
->target
));
3290 /* Arbitration won, target selected, went
3291 * to message out phase, sent one message
3292 * byte, then we stopped. ATN is asserted
3293 * on the SCSI bus and the target is still
3294 * there hanging on. This is a legal
3295 * sequence step if we gave the ESP a select
3298 * XXX See above, I could set the borken flag
3299 * XXX in the device struct and retry the
3300 * XXX command. But would that help for
3301 * XXX tagged capable targets?
3305 /* Arbitration won, target selected, maybe
3306 * sent the one message byte in message out
3307 * phase, but we did not go to command phase
3308 * in the end. Actually, we could have sent
3309 * only some of the message bytes if we tried
3310 * to send out the entire identify and tag
3311 * message using ESP_CMD_SA3.
3317 /* No, not the powerPC pinhead. Arbitration
3318 * won, all message bytes sent if we went to
3319 * message out phase, went to command phase
3320 * but only part of the command was sent.
3322 * XXX I've seen this, but usually in conjunction
3323 * XXX with a gross error which appears to have
3324 * XXX occurred between the time I told the
3325 * XXX ESP to arbitrate and when I got the
3326 * XXX interrupt. Could I have misloaded the
3327 * XXX command bytes into the fifo? Actually,
3328 * XXX I most likely missed a phase, and therefore
3329 * XXX went into never never land and didn't even
3330 * XXX know it. That was the old driver though.
3331 * XXX What is even more peculiar is that the ESP
3332 * XXX showed the proper function complete and
3333 * XXX bus service bits in the interrupt register.
3336 case ESP_STEP_FINI4
:
3337 case ESP_STEP_FINI5
:
3338 case ESP_STEP_FINI6
:
3339 case ESP_STEP_FINI7
:
3340 /* Account for the identify message */
3341 if (SCptr
->SCp
.phase
== in_slct_norm
)
3342 cmd_bytes_sent
-= 1;
3345 if (esp
->erev
!= fashme
)
3346 esp_cmd(esp
, ESP_CMD_NULL
);
3348 /* Be careful, we could really get fucked during synchronous
3349 * data transfers if we try to flush the fifo now.
3351 if ((esp
->erev
!= fashme
) && /* not a Happy Meal and... */
3352 !fcnt
&& /* Fifo is empty and... */
3353 /* either we are not doing synchronous transfers or... */
3354 (!SDptr
->sync_max_offset
||
3355 /* We are not going into data in phase. */
3356 ((esp
->sreg
& ESP_STAT_PMASK
) != ESP_DIP
)))
3357 esp_cmd(esp
, ESP_CMD_FLUSH
); /* flush is safe */
3359 /* See how far we got if this is not a slow command. */
3360 if (!esp
->esp_slowcmd
) {
3361 if (cmd_bytes_sent
< 0)
3363 if (cmd_bytes_sent
!= SCptr
->cmd_len
) {
3364 /* Crapola, mark it as a slowcmd
3365 * so that we have some chance of
3366 * keeping the command alive with
3369 * XXX Actually, if we didn't send it all
3370 * XXX this means either we didn't set things
3371 * XXX up properly (driver bug) or the target
3372 * XXX or the ESP detected parity on one of
3373 * XXX the command bytes. This makes much
3374 * XXX more sense, and therefore this code
3375 * XXX should be changed to send out a
3376 * XXX parity error message or if the status
3377 * XXX register shows no parity error then
3378 * XXX just expect the target to bring the
3379 * XXX bus into message in phase so that it
3380 * XXX can send us the parity error message.
3383 esp
->esp_slowcmd
= 1;
3384 esp
->esp_scmdp
= &(SCptr
->cmnd
[cmd_bytes_sent
]);
3385 esp
->esp_scmdleft
= (SCptr
->cmd_len
- cmd_bytes_sent
);
3389 /* Now figure out where we went. */
3390 esp_advance_phase(SCptr
, in_the_dark
);
3391 return esp_do_phase_determine(esp
);
3394 /* Did the target even make it? */
3395 if (esp
->ireg
== ESP_INTR_DC
) {
3396 /* wheee... nobody there or they didn't like
3397 * what we told it to do, clean up.
3400 /* If anyone is off the bus, but working on
3401 * a command in the background for us, tell
3402 * the ESP to listen for them.
3404 if (esp
->disconnected_SC
)
3405 esp_cmd(esp
, ESP_CMD_ESEL
);
3407 if (((1<<SCptr
->target
) & esp
->targets_present
) &&
3409 (esp
->cur_msgout
[0] == EXTENDED_MESSAGE
) &&
3410 (SCptr
->SCp
.phase
== in_slct_msg
||
3411 SCptr
->SCp
.phase
== in_slct_stop
)) {
3414 ESPLOG(("esp%d: Failed synchronous negotiation for target %d "
3415 "lun %d\n", esp
->esp_id
, SCptr
->target
, SCptr
->lun
));
3416 SDptr
->sync_max_offset
= 0;
3417 SDptr
->sync_min_period
= 0;
3418 SDptr
->sync
= 1; /* so we don't negotiate again */
3420 /* Run the command again, this time though we
3421 * won't try to negotiate for synchronous transfers.
3423 * XXX I'd like to do something like send an
3424 * XXX INITIATOR_ERROR or ABORT message to the
3425 * XXX target to tell it, "Sorry I confused you,
3426 * XXX please come back and I will be nicer next
3427 * XXX time". But that requires having the target
3428 * XXX on the bus, and it has dropped BSY on us.
3430 esp
->current_SC
= NULL
;
3431 esp_advance_phase(SCptr
, not_issued
);
3432 prepend_SC(&esp
->issue_SC
, SCptr
);
3437 /* Ok, this is normal, this is what we see during boot
3438 * or whenever when we are scanning the bus for targets.
3439 * But first make sure that is really what is happening.
3441 if (((1<<SCptr
->target
) & esp
->targets_present
)) {
3442 ESPLOG(("esp%d: Warning, live target %d not responding to "
3443 "selection.\n", esp
->esp_id
, SCptr
->target
));
3445 /* This _CAN_ happen. The SCSI standard states that
3446 * the target is to _not_ respond to selection if
3447 * _it_ detects bad parity on the bus for any reason.
3448 * Therefore, we assume that if we've talked successfully
3449 * to this target before, bad parity is the problem.
3451 esp_done(esp
, (DID_PARITY
<< 16));
3453 /* Else, there really isn't anyone there. */
3454 ESPMISC(("esp: selection failure, maybe nobody there?\n"));
3455 ESPMISC(("esp: target %d lun %d\n",
3456 SCptr
->target
, SCptr
->lun
));
3457 esp_done(esp
, (DID_BAD_TARGET
<< 16));
3462 ESPLOG(("esp%d: Selection failure.\n", esp
->esp_id
));
3463 printk("esp%d: Currently -- ", esp
->esp_id
);
3464 esp_print_ireg(esp
->ireg
); printk(" ");
3465 esp_print_statreg(esp
->sreg
); printk(" ");
3466 esp_print_seqreg(esp
->seqreg
); printk("\n");
3467 printk("esp%d: New -- ", esp
->esp_id
);
3468 esp
->sreg
= sbus_readb(esp
->eregs
+ ESP_STATUS
);
3469 esp
->seqreg
= sbus_readb(esp
->eregs
+ ESP_SSTEP
);
3470 esp
->ireg
= sbus_readb(esp
->eregs
+ ESP_INTRPT
);
3471 esp_print_ireg(esp
->ireg
); printk(" ");
3472 esp_print_statreg(esp
->sreg
); printk(" ");
3473 esp_print_seqreg(esp
->seqreg
); printk("\n");
3474 ESPLOG(("esp%d: resetting bus\n", esp
->esp_id
));
3475 return do_reset_bus
; /* ugh... */
3478 /* Continue reading bytes for msgin phase. */
3479 static int esp_do_msgincont(struct esp
*esp
)
3481 if (esp
->ireg
& ESP_INTR_BSERV
) {
3482 /* in the right phase too? */
3483 if ((esp
->sreg
& ESP_STAT_PMASK
) == ESP_MIP
) {
3485 esp_cmd(esp
, ESP_CMD_TI
);
3486 esp_advance_phase(esp
->current_SC
, in_msgindone
);
3490 /* We changed phase but ESP shows bus service,
3491 * in this case it is most likely that we, the
3492 * hacker who has been up for 20hrs straight
3493 * staring at the screen, drowned in coffee
3494 * smelling like retched cigarette ashes
3495 * have miscoded something..... so, try to
3496 * recover as best we can.
3498 ESPLOG(("esp%d: message in mis-carriage.\n", esp
->esp_id
));
3500 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3501 return do_phase_determine
;
3504 static int check_singlebyte_msg(struct esp
*esp
)
3506 esp
->prevmsgin
= esp
->cur_msgin
[0];
3507 if (esp
->cur_msgin
[0] & 0x80) {
3509 ESPLOG(("esp%d: target sends identify amidst phases\n",
3511 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3513 } else if (((esp
->cur_msgin
[0] & 0xf0) == 0x20) ||
3514 (esp
->cur_msgin
[0] == EXTENDED_MESSAGE
)) {
3516 esp_advance_phase(esp
->current_SC
, in_msgincont
);
3519 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3520 switch (esp
->cur_msgin
[0]) {
3522 /* We don't want to hear about it. */
3523 ESPLOG(("esp%d: msg %02x which we don't know about\n", esp
->esp_id
,
3524 esp
->cur_msgin
[0]));
3525 return MESSAGE_REJECT
;
3528 ESPLOG(("esp%d: target %d sends a nop\n", esp
->esp_id
,
3529 esp
->current_SC
->target
));
3532 case RESTORE_POINTERS
:
3533 /* In this case we might also have to backup the
3534 * "slow command" pointer. It is rare to get such
3535 * a save/restore pointer sequence so early in the
3536 * bus transition sequences, but cover it.
3538 if (esp
->esp_slowcmd
) {
3539 esp
->esp_scmdleft
= esp
->current_SC
->cmd_len
;
3540 esp
->esp_scmdp
= &esp
->current_SC
->cmnd
[0];
3542 esp_restore_pointers(esp
, esp
->current_SC
);
3546 esp_save_pointers(esp
, esp
->current_SC
);
3549 case COMMAND_COMPLETE
:
3551 /* Freeing the bus, let it go. */
3552 esp
->current_SC
->SCp
.phase
= in_freeing
;
3555 case MESSAGE_REJECT
:
3556 ESPMISC(("msg reject, "));
3557 if (esp
->prevmsgout
== EXTENDED_MESSAGE
) {
3558 Scsi_Device
*SDptr
= esp
->current_SC
->device
;
3560 /* Doesn't look like this target can
3561 * do synchronous or WIDE transfers.
3563 ESPSDTR(("got reject, was trying nego, clearing sync/WIDE\n"));
3566 SDptr
->sync_min_period
= 0;
3567 SDptr
->sync_max_offset
= 0;
3570 ESPMISC(("not sync nego, sending ABORT\n"));
3576 /* Target negotiates for synchronous transfers before we do, this
3577 * is legal although very strange. What is even funnier is that
3578 * the SCSI2 standard specifically recommends against targets doing
3579 * this because so many initiators cannot cope with this occuring.
3581 static int target_with_ants_in_pants(struct esp
*esp
,
3585 if (SDptr
->sync
|| SDptr
->borken
) {
3586 /* sorry, no can do */
3587 ESPSDTR(("forcing to async, "));
3588 build_sync_nego_msg(esp
, 0, 0);
3591 ESPLOG(("esp%d: hoping for msgout\n", esp
->esp_id
));
3592 esp_advance_phase(SCptr
, in_the_dark
);
3593 return EXTENDED_MESSAGE
;
3596 /* Ok, we'll check them out... */
3600 static void sync_report(struct esp
*esp
)
3605 msg3
= esp
->cur_msgin
[3];
3606 msg4
= esp
->cur_msgin
[4];
3608 int hz
= 1000000000 / (msg3
* 4);
3609 int integer
= hz
/ 1000000;
3610 int fraction
= (hz
- (integer
* 1000000)) / 10000;
3611 if ((esp
->erev
== fashme
) &&
3612 (esp
->config3
[esp
->current_SC
->target
] & ESP_CONFIG3_EWIDE
)) {
3616 } else if ((msg3
* 4) < 200) {
3619 type
= "synchronous";
3622 /* Do not transform this back into one big printk
3623 * again, it triggers a bug in our sparc64-gcc272
3624 * sibling call optimization. -DaveM
3626 ESPLOG((KERN_INFO
"esp%d: target %d ",
3627 esp
->esp_id
, esp
->current_SC
->target
));
3628 ESPLOG(("[period %dns offset %d %d.%02dMHz ",
3629 (int) msg3
* 4, (int) msg4
,
3630 integer
, fraction
));
3631 ESPLOG(("%s SCSI%s]\n", type
,
3632 (((msg3
* 4) < 200) ? "-II" : "")));
3634 ESPLOG((KERN_INFO
"esp%d: target %d asynchronous\n",
3635 esp
->esp_id
, esp
->current_SC
->target
));
3639 static int check_multibyte_msg(struct esp
*esp
)
3641 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
3642 Scsi_Device
*SDptr
= SCptr
->device
;
3644 int message_out
= 0;
3646 ESPSDTR(("chk multibyte msg: "));
3647 if (esp
->cur_msgin
[2] == EXTENDED_SDTR
) {
3648 int period
= esp
->cur_msgin
[3];
3649 int offset
= esp
->cur_msgin
[4];
3651 ESPSDTR(("is sync nego response, "));
3655 /* Target negotiates first! */
3656 ESPSDTR(("target jumps the gun, "));
3657 message_out
= EXTENDED_MESSAGE
; /* we must respond */
3658 rval
= target_with_ants_in_pants(esp
, SCptr
, SDptr
);
3663 ESPSDTR(("examining sdtr, "));
3665 /* Offset cannot be larger than ESP fifo size. */
3667 ESPSDTR(("offset too big %2x, ", offset
));
3669 ESPSDTR(("sending back new offset\n"));
3670 build_sync_nego_msg(esp
, period
, offset
);
3671 return EXTENDED_MESSAGE
;
3674 if (offset
&& period
> esp
->max_period
) {
3675 /* Yeee, async for this slow device. */
3676 ESPSDTR(("period too long %2x, ", period
));
3677 build_sync_nego_msg(esp
, 0, 0);
3678 ESPSDTR(("hoping for msgout\n"));
3679 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3680 return EXTENDED_MESSAGE
;
3681 } else if (offset
&& period
< esp
->min_period
) {
3682 ESPSDTR(("period too short %2x, ", period
));
3683 period
= esp
->min_period
;
3684 if (esp
->erev
> esp236
)
3688 } else if (offset
) {
3691 ESPSDTR(("period is ok, "));
3692 tmp
= esp
->ccycle
/ 1000;
3693 regval
= (((period
<< 2) + tmp
- 1) / tmp
);
3694 if (regval
&& ((esp
->erev
== fas100a
||
3695 esp
->erev
== fas236
||
3696 esp
->erev
== fashme
))) {
3705 SDptr
->sync_min_period
= (regval
& 0x1f);
3706 SDptr
->sync_max_offset
= (offset
| esp
->radelay
);
3707 if (esp
->erev
== fas100a
|| esp
->erev
== fas236
|| esp
->erev
== fashme
) {
3708 if ((esp
->erev
== fas100a
) || (esp
->erev
== fashme
))
3709 bit
= ESP_CONFIG3_FAST
;
3711 bit
= ESP_CONFIG3_FSCSI
;
3713 /* On FAS366, if using fast-20 synchronous transfers
3714 * we need to make sure the REQ/ACK assert/deassert
3715 * control bits are clear.
3717 if (esp
->erev
== fashme
)
3718 SDptr
->sync_max_offset
&= ~esp
->radelay
;
3719 esp
->config3
[SCptr
->target
] |= bit
;
3721 esp
->config3
[SCptr
->target
] &= ~bit
;
3723 esp
->prev_cfg3
= esp
->config3
[SCptr
->target
];
3724 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
3726 esp
->prev_soff
= SDptr
->sync_max_offset
;
3727 esp
->prev_stp
= SDptr
->sync_min_period
;
3728 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
3729 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
3730 ESPSDTR(("soff=%2x stp=%2x cfg3=%2x\n",
3731 SDptr
->sync_max_offset
,
3732 SDptr
->sync_min_period
,
3733 esp
->config3
[SCptr
->target
]));
3736 } else if (SDptr
->sync_max_offset
) {
3739 /* back to async mode */
3740 ESPSDTR(("unaccaptable sync nego, forcing async\n"));
3741 SDptr
->sync_max_offset
= 0;
3742 SDptr
->sync_min_period
= 0;
3745 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
3746 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
3747 if (esp
->erev
== fas100a
|| esp
->erev
== fas236
|| esp
->erev
== fashme
) {
3748 if ((esp
->erev
== fas100a
) || (esp
->erev
== fashme
))
3749 bit
= ESP_CONFIG3_FAST
;
3751 bit
= ESP_CONFIG3_FSCSI
;
3752 esp
->config3
[SCptr
->target
] &= ~bit
;
3753 esp
->prev_cfg3
= esp
->config3
[SCptr
->target
];
3754 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
3760 ESPSDTR(("chk multibyte msg: sync is known, "));
3764 ESPLOG(("esp%d: sending sdtr back, hoping for msgout\n",
3766 build_sync_nego_msg(esp
, period
, offset
);
3767 esp_advance_phase(SCptr
, in_the_dark
);
3768 return EXTENDED_MESSAGE
;
3771 ESPSDTR(("returning zero\n"));
3772 esp_advance_phase(SCptr
, in_the_dark
); /* ...or else! */
3774 } else if (esp
->cur_msgin
[2] == EXTENDED_WDTR
) {
3775 int size
= 8 << esp
->cur_msgin
[3];
3778 if (esp
->erev
!= fashme
) {
3779 ESPLOG(("esp%d: AIEEE wide msg received and not HME.\n",
3781 message_out
= MESSAGE_REJECT
;
3782 } else if (size
> 16) {
3783 ESPLOG(("esp%d: AIEEE wide transfer for %d size "
3784 "not supported.\n", esp
->esp_id
, size
));
3785 message_out
= MESSAGE_REJECT
;
3787 /* Things look good; let's see what we got. */
3789 /* Set config 3 register for this target. */
3790 esp
->config3
[SCptr
->target
] |= ESP_CONFIG3_EWIDE
;
3792 /* Just make sure it was one byte sized. */
3794 ESPLOG(("esp%d: Aieee, wide nego of %d size.\n",
3795 esp
->esp_id
, size
));
3796 message_out
= MESSAGE_REJECT
;
3799 /* Pure paranoia. */
3800 esp
->config3
[SCptr
->target
] &= ~(ESP_CONFIG3_EWIDE
);
3802 esp
->prev_cfg3
= esp
->config3
[SCptr
->target
];
3803 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
3805 /* Regardless, next try for sync transfers. */
3806 build_sync_nego_msg(esp
, esp
->sync_defp
, 15);
3809 message_out
= EXTENDED_MESSAGE
;
3811 } else if (esp
->cur_msgin
[2] == EXTENDED_MODIFY_DATA_POINTER
) {
3812 ESPLOG(("esp%d: rejecting modify data ptr msg\n", esp
->esp_id
));
3813 message_out
= MESSAGE_REJECT
;
3816 esp_advance_phase(SCptr
, in_the_dark
);
3820 static int esp_do_msgindone(struct esp
*esp
)
3822 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
3823 int message_out
= 0, it
= 0, rval
;
3825 rval
= skipahead1(esp
, SCptr
, in_msgin
, in_msgindone
);
3828 if (SCptr
->SCp
.sent_command
!= in_status
) {
3829 if (!(esp
->ireg
& ESP_INTR_DC
)) {
3830 if (esp
->msgin_len
&& (esp
->sreg
& ESP_STAT_PERR
)) {
3831 message_out
= MSG_PARITY_ERROR
;
3832 esp_cmd(esp
, ESP_CMD_FLUSH
);
3833 } else if (esp
->erev
!= fashme
&&
3834 (it
= (sbus_readb(esp
->eregs
+ ESP_FFLAGS
) & ESP_FF_FBYTES
)) != 1) {
3835 /* We certainly dropped the ball somewhere. */
3836 message_out
= INITIATOR_ERROR
;
3837 esp_cmd(esp
, ESP_CMD_FLUSH
);
3838 } else if (!esp
->msgin_len
) {
3839 if (esp
->erev
== fashme
)
3840 it
= esp
->hme_fifo_workaround_buffer
[0];
3842 it
= sbus_readb(esp
->eregs
+ ESP_FDATA
);
3843 esp_advance_phase(SCptr
, in_msgincont
);
3845 /* it is ok and we want it */
3846 if (esp
->erev
== fashme
)
3847 it
= esp
->cur_msgin
[esp
->msgin_ctr
] =
3848 esp
->hme_fifo_workaround_buffer
[0];
3850 it
= esp
->cur_msgin
[esp
->msgin_ctr
] =
3851 sbus_readb(esp
->eregs
+ ESP_FDATA
);
3855 esp_advance_phase(SCptr
, in_the_dark
);
3859 it
= esp
->cur_msgin
[0];
3861 if (!message_out
&& esp
->msgin_len
) {
3862 if (esp
->msgin_ctr
< esp
->msgin_len
) {
3863 esp_advance_phase(SCptr
, in_msgincont
);
3864 } else if (esp
->msgin_len
== 1) {
3865 message_out
= check_singlebyte_msg(esp
);
3866 } else if (esp
->msgin_len
== 2) {
3867 if (esp
->cur_msgin
[0] == EXTENDED_MESSAGE
) {
3868 if ((it
+ 2) >= 15) {
3869 message_out
= MESSAGE_REJECT
;
3871 esp
->msgin_len
= (it
+ 2);
3872 esp_advance_phase(SCptr
, in_msgincont
);
3875 message_out
= MESSAGE_REJECT
; /* foo on you */
3878 message_out
= check_multibyte_msg(esp
);
3881 if (message_out
< 0) {
3882 return -message_out
;
3883 } else if (message_out
) {
3884 if (((message_out
!= 1) &&
3885 ((message_out
< 0x20) || (message_out
& 0x80))))
3886 esp
->msgout_len
= 1;
3887 esp
->cur_msgout
[0] = message_out
;
3888 esp_cmd(esp
, ESP_CMD_SATN
);
3889 esp_advance_phase(SCptr
, in_the_dark
);
3892 esp
->sreg
= sbus_readb(esp
->eregs
+ ESP_STATUS
);
3893 esp
->sreg
&= ~(ESP_STAT_INTR
);
3894 if ((esp
->sreg
& (ESP_STAT_PMSG
|ESP_STAT_PCD
)) == (ESP_STAT_PMSG
|ESP_STAT_PCD
))
3895 esp_cmd(esp
, ESP_CMD_MOK
);
3896 if ((SCptr
->SCp
.sent_command
== in_msgindone
) &&
3897 (SCptr
->SCp
.phase
== in_freeing
))
3898 return esp_do_freebus(esp
);
3902 static int esp_do_cmdbegin(struct esp
*esp
)
3904 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
3906 esp_advance_phase(SCptr
, in_cmdend
);
3907 if (esp
->erev
== fashme
) {
3908 u32 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
3911 for (i
= 0; i
< esp
->esp_scmdleft
; i
++)
3912 esp
->esp_command
[i
] = *esp
->esp_scmdp
++;
3913 esp
->esp_scmdleft
= 0;
3914 esp_cmd(esp
, ESP_CMD_FLUSH
);
3915 esp_setcount(esp
->eregs
, i
, 1);
3916 esp_cmd(esp
, (ESP_CMD_DMA
| ESP_CMD_TI
));
3917 tmp
|= (DMA_SCSI_DISAB
| DMA_ENABLE
);
3918 tmp
&= ~(DMA_ST_WRITE
);
3919 sbus_writel(i
, esp
->dregs
+ DMA_COUNT
);
3920 sbus_writel(esp
->esp_command_dvma
, esp
->dregs
+ DMA_ADDR
);
3921 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
3925 esp_cmd(esp
, ESP_CMD_FLUSH
);
3926 tmp
= *esp
->esp_scmdp
++;
3927 esp
->esp_scmdleft
--;
3928 sbus_writeb(tmp
, esp
->eregs
+ ESP_FDATA
);
3929 esp_cmd(esp
, ESP_CMD_TI
);
3934 static int esp_do_cmddone(struct esp
*esp
)
3936 if (esp
->erev
== fashme
)
3937 dma_invalidate(esp
);
3939 esp_cmd(esp
, ESP_CMD_NULL
);
3941 if (esp
->ireg
& ESP_INTR_BSERV
) {
3942 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3943 return esp_do_phase_determine(esp
);
3946 ESPLOG(("esp%d: in do_cmddone() but didn't get BSERV interrupt.\n",
3948 return do_reset_bus
;
3951 static int esp_do_msgout(struct esp
*esp
)
3953 esp_cmd(esp
, ESP_CMD_FLUSH
);
3954 switch (esp
->msgout_len
) {
3956 if (esp
->erev
== fashme
)
3957 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 1);
3959 sbus_writeb(esp
->cur_msgout
[0], esp
->eregs
+ ESP_FDATA
);
3961 esp_cmd(esp
, ESP_CMD_TI
);
3965 esp
->esp_command
[0] = esp
->cur_msgout
[0];
3966 esp
->esp_command
[1] = esp
->cur_msgout
[1];
3968 if (esp
->erev
== fashme
) {
3969 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 2);
3970 esp_cmd(esp
, ESP_CMD_TI
);
3972 dma_setup(esp
, esp
->esp_command_dvma
, 2, 0);
3973 esp_setcount(esp
->eregs
, 2, 0);
3974 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
3979 esp
->esp_command
[0] = esp
->cur_msgout
[0];
3980 esp
->esp_command
[1] = esp
->cur_msgout
[1];
3981 esp
->esp_command
[2] = esp
->cur_msgout
[2];
3982 esp
->esp_command
[3] = esp
->cur_msgout
[3];
3985 if (esp
->erev
== fashme
) {
3986 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 4);
3987 esp_cmd(esp
, ESP_CMD_TI
);
3989 dma_setup(esp
, esp
->esp_command_dvma
, 4, 0);
3990 esp_setcount(esp
->eregs
, 4, 0);
3991 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
3996 esp
->esp_command
[0] = esp
->cur_msgout
[0];
3997 esp
->esp_command
[1] = esp
->cur_msgout
[1];
3998 esp
->esp_command
[2] = esp
->cur_msgout
[2];
3999 esp
->esp_command
[3] = esp
->cur_msgout
[3];
4000 esp
->esp_command
[4] = esp
->cur_msgout
[4];
4003 if (esp
->erev
== fashme
) {
4004 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 5);
4005 esp_cmd(esp
, ESP_CMD_TI
);
4007 dma_setup(esp
, esp
->esp_command_dvma
, 5, 0);
4008 esp_setcount(esp
->eregs
, 5, 0);
4009 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
4015 ESPMISC(("bogus msgout sending NOP\n"));
4016 esp
->cur_msgout
[0] = NOP
;
4018 if (esp
->erev
== fashme
) {
4019 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 1);
4021 sbus_writeb(esp
->cur_msgout
[0], esp
->eregs
+ ESP_FDATA
);
4024 esp
->msgout_len
= 1;
4025 esp_cmd(esp
, ESP_CMD_TI
);
4029 esp_advance_phase(esp
->current_SC
, in_msgoutdone
);
4033 static int esp_do_msgoutdone(struct esp
*esp
)
4035 if (esp
->msgout_len
> 1) {
4036 /* XXX HME/FAS ATN deassert workaround required,
4037 * XXX no DMA flushing, only possible ESP_CMD_FLUSH
4038 * XXX to kill the fifo.
4040 if (esp
->erev
!= fashme
) {
4043 while ((tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
)) & DMA_PEND_READ
)
4046 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
4047 dma_invalidate(esp
);
4049 esp_cmd(esp
, ESP_CMD_FLUSH
);
4052 if (!(esp
->ireg
& ESP_INTR_DC
)) {
4053 if (esp
->erev
!= fashme
)
4054 esp_cmd(esp
, ESP_CMD_NULL
);
4055 switch (esp
->sreg
& ESP_STAT_PMASK
) {
4057 /* whoops, parity error */
4058 ESPLOG(("esp%d: still in msgout, parity error assumed\n",
4060 if (esp
->msgout_len
> 1)
4061 esp_cmd(esp
, ESP_CMD_SATN
);
4062 esp_advance_phase(esp
->current_SC
, in_msgout
);
4069 /* Happy Meal fifo is touchy... */
4070 if ((esp
->erev
!= fashme
) &&
4072 !(esp
->current_SC
->device
->sync_max_offset
))
4073 esp_cmd(esp
, ESP_CMD_FLUSH
);
4078 ESPLOG(("esp%d: disconnect, resetting bus\n", esp
->esp_id
));
4079 return do_reset_bus
;
4082 /* If we sent out a synchronous negotiation message, update
4085 if (esp
->cur_msgout
[2] == EXTENDED_MESSAGE
&&
4086 esp
->cur_msgout
[4] == EXTENDED_SDTR
) {
4087 esp
->snip
= 1; /* anal retentiveness... */
4090 esp
->prevmsgout
= esp
->cur_msgout
[0];
4091 esp
->msgout_len
= 0;
4092 esp_advance_phase(esp
->current_SC
, in_the_dark
);
4093 return esp_do_phase_determine(esp
);
4096 static int esp_bus_unexpected(struct esp
*esp
)
4098 ESPLOG(("esp%d: command in weird state %2x\n",
4099 esp
->esp_id
, esp
->current_SC
->SCp
.phase
));
4100 return do_reset_bus
;
4103 static espfunc_t bus_vector
[] = {
4116 esp_do_phase_determine
,
4122 /* This is the second tier in our dual-level SCSI state machine. */
4123 static int esp_work_bus(struct esp
*esp
)
4125 Scsi_Cmnd
*SCptr
= esp
->current_SC
;
4128 ESPBUS(("esp_work_bus: "));
4130 ESPBUS(("reconnect\n"));
4131 return esp_do_reconnect(esp
);
4133 phase
= SCptr
->SCp
.phase
;
4134 if ((phase
& 0xf0) == in_phases_mask
)
4135 return bus_vector
[(phase
& 0x0f)](esp
);
4136 else if ((phase
& 0xf0) == in_slct_mask
)
4137 return esp_select_complete(esp
);
4139 return esp_bus_unexpected(esp
);
4142 static espfunc_t isvc_vector
[] = {
4144 esp_do_phase_determine
,
4150 /* Main interrupt handler for an esp adapter. */
4151 static void esp_handle(struct esp
*esp
)
4154 int what_next
= do_intr_end
;
4156 SCptr
= esp
->current_SC
;
4158 /* Check for errors. */
4159 esp
->sreg
= sbus_readb(esp
->eregs
+ ESP_STATUS
);
4160 esp
->sreg
&= (~ESP_STAT_INTR
);
4161 if (esp
->erev
== fashme
) {
4162 esp
->sreg2
= sbus_readb(esp
->eregs
+ ESP_STATUS2
);
4163 esp
->seqreg
= (sbus_readb(esp
->eregs
+ ESP_SSTEP
) & ESP_STEP_VBITS
);
4166 if (esp
->sreg
& (ESP_STAT_SPAM
)) {
4167 /* Gross error, could be due to one of:
4169 * - top of fifo overwritten, could be because
4170 * we tried to do a synchronous transfer with
4171 * an offset greater than ESP fifo size
4173 * - top of command register overwritten
4175 * - DMA setup to go in one direction, SCSI
4176 * bus points in the other, whoops
4178 * - weird phase change during asynchronous
4179 * data phase while we are initiator
4181 ESPLOG(("esp%d: Gross error sreg=%2x\n", esp
->esp_id
, esp
->sreg
));
4183 /* If a command is live on the bus we cannot safely
4184 * reset the bus, so we'll just let the pieces fall
4185 * where they may. Here we are hoping that the
4186 * target will be able to cleanly go away soon
4187 * so we can safely reset things.
4190 ESPLOG(("esp%d: No current cmd during gross error, "
4191 "resetting bus\n", esp
->esp_id
));
4192 what_next
= do_reset_bus
;
4197 if (sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_HNDL_ERROR
) {
4198 /* A DMA gate array error. Here we must
4199 * be seeing one of two things. Either the
4200 * virtual to physical address translation
4201 * on the SBUS could not occur, else the
4202 * translation it did get pointed to a bogus
4205 ESPLOG(("esp%d: DMA error %08x\n", esp
->esp_id
,
4206 sbus_readl(esp
->dregs
+ DMA_CSR
)));
4208 /* DMA gate array itself must be reset to clear the
4213 what_next
= do_reset_bus
;
4217 esp
->ireg
= sbus_readb(esp
->eregs
+ ESP_INTRPT
); /* Unlatch intr reg */
4219 if (esp
->erev
== fashme
) {
4220 /* This chip is really losing. */
4223 ESPHME(("sreg2=%02x,", esp
->sreg2
));
4224 /* Must latch fifo before reading the interrupt
4225 * register else garbage ends up in the FIFO
4226 * which confuses the driver utterly.
4228 if (!(esp
->sreg2
& ESP_STAT2_FEMPTY
) ||
4229 (esp
->sreg2
& ESP_STAT2_F1BYTE
)) {
4230 ESPHME(("fifo_workaround]"));
4233 ESPHME(("no_fifo_workaround]"));
4237 /* No current cmd is only valid at this point when there are
4238 * commands off the bus or we are trying a reset.
4240 if (!SCptr
&& !esp
->disconnected_SC
&& !(esp
->ireg
& ESP_INTR_SR
)) {
4241 /* Panic is safe, since current_SC is null. */
4242 ESPLOG(("esp%d: no command in esp_handle()\n", esp
->esp_id
));
4243 panic("esp_handle: current_SC == penguin within interrupt!");
4246 if (esp
->ireg
& (ESP_INTR_IC
)) {
4247 /* Illegal command fed to ESP. Outside of obvious
4248 * software bugs that could cause this, there is
4249 * a condition with esp100 where we can confuse the
4250 * ESP into an erroneous illegal command interrupt
4251 * because it does not scrape the FIFO properly
4252 * for reselection. See esp100_reconnect_hwbug()
4253 * to see how we try very hard to avoid this.
4255 ESPLOG(("esp%d: illegal command\n", esp
->esp_id
));
4257 esp_dump_state(esp
);
4259 if (SCptr
!= NULL
) {
4260 /* Devices with very buggy firmware can drop BSY
4261 * during a scatter list interrupt when using sync
4262 * mode transfers. We continue the transfer as
4263 * expected, the target drops the bus, the ESP
4264 * gets confused, and we get a illegal command
4265 * interrupt because the bus is in the disconnected
4266 * state now and ESP_CMD_TI is only allowed when
4267 * a nexus is alive on the bus.
4269 ESPLOG(("esp%d: Forcing async and disabling disconnect for "
4270 "target %d\n", esp
->esp_id
, SCptr
->target
));
4271 SCptr
->device
->borken
= 1; /* foo on you */
4274 what_next
= do_reset_bus
;
4275 } else if (!(esp
->ireg
& ~(ESP_INTR_FDONE
| ESP_INTR_BSERV
| ESP_INTR_DC
))) {
4277 unsigned int phase
= SCptr
->SCp
.phase
;
4279 if (phase
& in_phases_mask
) {
4280 what_next
= esp_work_bus(esp
);
4281 } else if (phase
& in_slct_mask
) {
4282 what_next
= esp_select_complete(esp
);
4284 ESPLOG(("esp%d: interrupt for no good reason...\n",
4286 what_next
= do_intr_end
;
4289 ESPLOG(("esp%d: BSERV or FDONE or DC while SCptr==NULL\n",
4291 what_next
= do_reset_bus
;
4293 } else if (esp
->ireg
& ESP_INTR_SR
) {
4294 ESPLOG(("esp%d: SCSI bus reset interrupt\n", esp
->esp_id
));
4295 what_next
= do_reset_complete
;
4296 } else if (esp
->ireg
& (ESP_INTR_S
| ESP_INTR_SATN
)) {
4297 ESPLOG(("esp%d: AIEEE we have been selected by another initiator!\n",
4299 what_next
= do_reset_bus
;
4300 } else if (esp
->ireg
& ESP_INTR_RSEL
) {
4301 if (SCptr
== NULL
) {
4303 what_next
= esp_do_reconnect(esp
);
4304 } else if (SCptr
->SCp
.phase
& in_slct_mask
) {
4305 /* Only selection code knows how to clean
4308 ESPDISC(("Reselected during selection attempt\n"));
4309 what_next
= esp_select_complete(esp
);
4311 ESPLOG(("esp%d: Reselected while bus is busy\n",
4313 what_next
= do_reset_bus
;
4317 /* This is tier-one in our dual level SCSI state machine. */
4319 while (what_next
!= do_intr_end
) {
4320 if (what_next
>= do_phase_determine
&&
4321 what_next
< do_intr_end
) {
4322 what_next
= isvc_vector
[what_next
](esp
);
4324 /* state is completely lost ;-( */
4325 ESPLOG(("esp%d: interrupt engine loses state, resetting bus\n",
4327 what_next
= do_reset_bus
;
4332 /* Service only the ESP described by dev_id. */
4333 static void esp_intr(int irq
, void *dev_id
, struct pt_regs
*pregs
)
4335 struct esp
*esp
= dev_id
;
4336 unsigned long flags
;
4338 spin_lock_irqsave(&esp
->lock
, flags
);
4339 if (ESP_IRQ_P(esp
->dregs
)) {
4340 ESP_INTSOFF(esp
->dregs
);
4342 ESPIRQ(("I[%d:%d](", smp_processor_id(), esp
->esp_id
));
4346 ESP_INTSON(esp
->dregs
);
4348 spin_unlock_irqrestore(&esp
->lock
, flags
);
4351 int esp_revoke(Scsi_Device
* SDptr
)
4353 struct esp
*esp
= (struct esp
*) SDptr
->host
->hostdata
;
4354 esp
->targets_present
&= ~(1 << SDptr
->id
);
4359 Scsi_Host_Template driver_template
= SCSI_SPARC_ESP
;
4361 #include "scsi_module.c"