1 /* esp.c: ESP Sun SCSI driver.
3 * Copyright (C) 1995, 1998, 2006 David S. Miller (davem@davemloft.net)
8 * 1) Maybe disable parity checking in config register one for SCSI1
9 * targets. (Gilmore says parity error on the SBus can lock up
11 * 2) Add support for DMA2 pipelining.
12 * 3) Add tagged queueing.
15 #include <linux/config.h>
16 #include <linux/kernel.h>
17 #include <linux/delay.h>
18 #include <linux/types.h>
19 #include <linux/string.h>
20 #include <linux/slab.h>
21 #include <linux/blkdev.h>
22 #include <linux/proc_fs.h>
23 #include <linux/stat.h>
24 #include <linux/init.h>
25 #include <linux/spinlock.h>
26 #include <linux/interrupt.h>
27 #include <linux/module.h>
33 #include <asm/system.h>
34 #include <asm/ptrace.h>
35 #include <asm/pgtable.h>
36 #include <asm/oplib.h>
40 #include <asm/machines.h>
41 #include <asm/idprom.h>
44 #include <scsi/scsi.h>
45 #include <scsi/scsi_cmnd.h>
46 #include <scsi/scsi_device.h>
47 #include <scsi/scsi_eh.h>
48 #include <scsi/scsi_host.h>
49 #include <scsi/scsi_tcq.h>
51 #define DRV_VERSION "1.101"
54 /* #define DEBUG_ESP_HME */
55 /* #define DEBUG_ESP_DATA */
56 /* #define DEBUG_ESP_QUEUE */
57 /* #define DEBUG_ESP_DISCONNECT */
58 /* #define DEBUG_ESP_STATUS */
59 /* #define DEBUG_ESP_PHASES */
60 /* #define DEBUG_ESP_WORKBUS */
61 /* #define DEBUG_STATE_MACHINE */
62 /* #define DEBUG_ESP_CMDS */
63 /* #define DEBUG_ESP_IRQS */
64 /* #define DEBUG_SDTR */
65 /* #define DEBUG_ESP_SG */
67 /* Use the following to sprinkle debugging messages in a way which
68 * suits you if combinations of the above become too verbose when
69 * trying to track down a specific problem.
71 /* #define DEBUG_ESP_MISC */
73 #if defined(DEBUG_ESP)
74 #define ESPLOG(foo) printk foo
77 #endif /* (DEBUG_ESP) */
79 #if defined(DEBUG_ESP_HME)
80 #define ESPHME(foo) printk foo
85 #if defined(DEBUG_ESP_DATA)
86 #define ESPDATA(foo) printk foo
91 #if defined(DEBUG_ESP_QUEUE)
92 #define ESPQUEUE(foo) printk foo
97 #if defined(DEBUG_ESP_DISCONNECT)
98 #define ESPDISC(foo) printk foo
103 #if defined(DEBUG_ESP_STATUS)
104 #define ESPSTAT(foo) printk foo
109 #if defined(DEBUG_ESP_PHASES)
110 #define ESPPHASE(foo) printk foo
112 #define ESPPHASE(foo)
115 #if defined(DEBUG_ESP_WORKBUS)
116 #define ESPBUS(foo) printk foo
121 #if defined(DEBUG_ESP_IRQS)
122 #define ESPIRQ(foo) printk foo
127 #if defined(DEBUG_SDTR)
128 #define ESPSDTR(foo) printk foo
133 #if defined(DEBUG_ESP_MISC)
134 #define ESPMISC(foo) printk foo
139 /* Command phase enumeration. */
141 not_issued
= 0x00, /* Still in the issue_SC queue. */
143 /* Various forms of selecting a target. */
144 #define in_slct_mask 0x10
145 in_slct_norm
= 0x10, /* ESP is arbitrating, normal selection */
146 in_slct_stop
= 0x11, /* ESP will select, then stop with IRQ */
147 in_slct_msg
= 0x12, /* select, then send a message */
148 in_slct_tag
= 0x13, /* select and send tagged queue msg */
149 in_slct_sneg
= 0x14, /* select and acquire sync capabilities */
151 /* Any post selection activity. */
152 #define in_phases_mask 0x20
153 in_datain
= 0x20, /* Data is transferring from the bus */
154 in_dataout
= 0x21, /* Data is transferring to the bus */
155 in_data_done
= 0x22, /* Last DMA data operation done (maybe) */
156 in_msgin
= 0x23, /* Eating message from target */
157 in_msgincont
= 0x24, /* Eating more msg bytes from target */
158 in_msgindone
= 0x25, /* Decide what to do with what we got */
159 in_msgout
= 0x26, /* Sending message to target */
160 in_msgoutdone
= 0x27, /* Done sending msg out */
161 in_cmdbegin
= 0x28, /* Sending cmd after abnormal selection */
162 in_cmdend
= 0x29, /* Done sending slow cmd */
163 in_status
= 0x2a, /* Was in status phase, finishing cmd */
164 in_freeing
= 0x2b, /* freeing the bus for cmd cmplt or disc */
165 in_the_dark
= 0x2c, /* Don't know what bus phase we are in */
167 /* Special states, ie. not normal bus transitions... */
168 #define in_spec_mask 0x80
169 in_abortone
= 0x80, /* Aborting one command currently */
170 in_abortall
= 0x81, /* Blowing away all commands we have */
171 in_resetdev
= 0x82, /* SCSI target reset in progress */
172 in_resetbus
= 0x83, /* SCSI bus reset in progress */
173 in_tgterror
= 0x84, /* Target did something stupid */
177 /* Zero has special meaning, see skipahead[12]. */
180 /*1*/ do_phase_determine
,
182 /*3*/ do_reset_complete
,
187 /* Forward declarations. */
188 static irqreturn_t
esp_intr(int irq
, void *dev_id
, struct pt_regs
*pregs
);
190 /* Debugging routines */
191 struct esp_cmdstrings
{
194 } esp_cmd_strings
[] = {
196 { ESP_CMD_NULL
, "ESP_NOP", },
197 { ESP_CMD_FLUSH
, "FIFO_FLUSH", },
198 { ESP_CMD_RC
, "RSTESP", },
199 { ESP_CMD_RS
, "RSTSCSI", },
200 /* Disconnected State Group */
201 { ESP_CMD_RSEL
, "RESLCTSEQ", },
202 { ESP_CMD_SEL
, "SLCTNATN", },
203 { ESP_CMD_SELA
, "SLCTATN", },
204 { ESP_CMD_SELAS
, "SLCTATNSTOP", },
205 { ESP_CMD_ESEL
, "ENSLCTRESEL", },
206 { ESP_CMD_DSEL
, "DISSELRESEL", },
207 { ESP_CMD_SA3
, "SLCTATN3", },
208 { ESP_CMD_RSEL3
, "RESLCTSEQ", },
209 /* Target State Group */
210 { ESP_CMD_SMSG
, "SNDMSG", },
211 { ESP_CMD_SSTAT
, "SNDSTATUS", },
212 { ESP_CMD_SDATA
, "SNDDATA", },
213 { ESP_CMD_DSEQ
, "DISCSEQ", },
214 { ESP_CMD_TSEQ
, "TERMSEQ", },
215 { ESP_CMD_TCCSEQ
, "TRGTCMDCOMPSEQ", },
216 { ESP_CMD_DCNCT
, "DISC", },
217 { ESP_CMD_RMSG
, "RCVMSG", },
218 { ESP_CMD_RCMD
, "RCVCMD", },
219 { ESP_CMD_RDATA
, "RCVDATA", },
220 { ESP_CMD_RCSEQ
, "RCVCMDSEQ", },
221 /* Initiator State Group */
222 { ESP_CMD_TI
, "TRANSINFO", },
223 { ESP_CMD_ICCSEQ
, "INICMDSEQCOMP", },
224 { ESP_CMD_MOK
, "MSGACCEPTED", },
225 { ESP_CMD_TPAD
, "TPAD", },
226 { ESP_CMD_SATN
, "SATN", },
227 { ESP_CMD_RATN
, "RATN", },
229 #define NUM_ESP_COMMANDS ((sizeof(esp_cmd_strings)) / (sizeof(struct esp_cmdstrings)))
231 /* Print textual representation of an ESP command */
232 static inline void esp_print_cmd(u8 espcmd
)
234 u8 dma_bit
= espcmd
& ESP_CMD_DMA
;
238 for (i
= 0; i
< NUM_ESP_COMMANDS
; i
++)
239 if (esp_cmd_strings
[i
].cmdchar
== espcmd
)
241 if (i
== NUM_ESP_COMMANDS
)
242 printk("ESP_Unknown");
244 printk("%s%s", esp_cmd_strings
[i
].text
,
245 ((dma_bit
) ? "+DMA" : ""));
248 /* Print the status register's value */
249 static inline void esp_print_statreg(u8 statreg
)
254 phase
= statreg
& ESP_STAT_PMASK
;
255 printk("%s,", (phase
== ESP_DOP
? "DATA-OUT" :
256 (phase
== ESP_DIP
? "DATA-IN" :
257 (phase
== ESP_CMDP
? "COMMAND" :
258 (phase
== ESP_STATP
? "STATUS" :
259 (phase
== ESP_MOP
? "MSG-OUT" :
260 (phase
== ESP_MIP
? "MSG_IN" :
262 if (statreg
& ESP_STAT_TDONE
)
263 printk("TRANS_DONE,");
264 if (statreg
& ESP_STAT_TCNT
)
265 printk("TCOUNT_ZERO,");
266 if (statreg
& ESP_STAT_PERR
)
268 if (statreg
& ESP_STAT_SPAM
)
270 if (statreg
& ESP_STAT_INTR
)
275 /* Print the interrupt register's value */
276 static inline void esp_print_ireg(u8 intreg
)
279 if (intreg
& ESP_INTR_S
)
280 printk("SLCT_NATN ");
281 if (intreg
& ESP_INTR_SATN
)
283 if (intreg
& ESP_INTR_RSEL
)
285 if (intreg
& ESP_INTR_FDONE
)
287 if (intreg
& ESP_INTR_BSERV
)
289 if (intreg
& ESP_INTR_DC
)
291 if (intreg
& ESP_INTR_IC
)
293 if (intreg
& ESP_INTR_SR
)
294 printk("SCSI_BUS_RESET ");
298 /* Print the sequence step registers contents */
299 static inline void esp_print_seqreg(u8 stepreg
)
301 stepreg
&= ESP_STEP_VBITS
;
303 (stepreg
== ESP_STEP_ASEL
? "SLCT_ARB_CMPLT" :
304 (stepreg
== ESP_STEP_SID
? "1BYTE_MSG_SENT" :
305 (stepreg
== ESP_STEP_NCMD
? "NOT_IN_CMD_PHASE" :
306 (stepreg
== ESP_STEP_PPC
? "CMD_BYTES_LOST" :
307 (stepreg
== ESP_STEP_FINI4
? "CMD_SENT_OK" :
311 static char *phase_string(int phase
)
367 #ifdef DEBUG_STATE_MACHINE
368 static inline void esp_advance_phase(struct scsi_cmnd
*s
, int newphase
)
370 ESPLOG(("<%s>", phase_string(newphase
)));
371 s
->SCp
.sent_command
= s
->SCp
.phase
;
372 s
->SCp
.phase
= newphase
;
375 #define esp_advance_phase(__s, __newphase) \
376 (__s)->SCp.sent_command = (__s)->SCp.phase; \
377 (__s)->SCp.phase = (__newphase);
380 #ifdef DEBUG_ESP_CMDS
381 static inline void esp_cmd(struct esp
*esp
, u8 cmd
)
383 esp
->espcmdlog
[esp
->espcmdent
] = cmd
;
384 esp
->espcmdent
= (esp
->espcmdent
+ 1) & 31;
385 sbus_writeb(cmd
, esp
->eregs
+ ESP_CMD
);
388 #define esp_cmd(__esp, __cmd) \
389 sbus_writeb((__cmd), ((__esp)->eregs) + ESP_CMD)
392 #define ESP_INTSOFF(__dregs) \
393 sbus_writel(sbus_readl((__dregs)+DMA_CSR)&~(DMA_INT_ENAB), (__dregs)+DMA_CSR)
394 #define ESP_INTSON(__dregs) \
395 sbus_writel(sbus_readl((__dregs)+DMA_CSR)|DMA_INT_ENAB, (__dregs)+DMA_CSR)
396 #define ESP_IRQ_P(__dregs) \
397 (sbus_readl((__dregs)+DMA_CSR) & (DMA_HNDL_INTR|DMA_HNDL_ERROR))
399 /* How we use the various Linux SCSI data structures for operation.
403 * We keep track of the synchronous capabilities of a target
404 * in the device member, using sync_min_period and
405 * sync_max_offset. These are the values we directly write
406 * into the ESP registers while running a command. If offset
407 * is zero the ESP will use asynchronous transfers.
408 * If the borken flag is set we assume we shouldn't even bother
409 * trying to negotiate for synchronous transfer as this target
410 * is really stupid. If we notice the target is dropping the
411 * bus, and we have been allowing it to disconnect, we clear
412 * the disconnect flag.
416 /* Manipulation of the ESP command queues. Thanks to the aha152x driver
417 * and its author, Juergen E. Fischer, for the methods used here.
418 * Note that these are per-ESP queues, not global queues like
419 * the aha152x driver uses.
421 static inline void append_SC(struct scsi_cmnd
**SC
, struct scsi_cmnd
*new_SC
)
423 struct scsi_cmnd
*end
;
425 new_SC
->host_scribble
= (unsigned char *) NULL
;
429 for (end
=*SC
;end
->host_scribble
;end
=(struct scsi_cmnd
*)end
->host_scribble
)
431 end
->host_scribble
= (unsigned char *) new_SC
;
435 static inline void prepend_SC(struct scsi_cmnd
**SC
, struct scsi_cmnd
*new_SC
)
437 new_SC
->host_scribble
= (unsigned char *) *SC
;
441 static inline struct scsi_cmnd
*remove_first_SC(struct scsi_cmnd
**SC
)
443 struct scsi_cmnd
*ptr
;
446 *SC
= (struct scsi_cmnd
*) (*SC
)->host_scribble
;
450 static inline struct scsi_cmnd
*remove_SC(struct scsi_cmnd
**SC
, int target
, int lun
)
452 struct scsi_cmnd
*ptr
, *prev
;
454 for (ptr
= *SC
, prev
= NULL
;
455 ptr
&& ((ptr
->device
->id
!= target
) || (ptr
->device
->lun
!= lun
));
456 prev
= ptr
, ptr
= (struct scsi_cmnd
*) ptr
->host_scribble
)
460 prev
->host_scribble
=ptr
->host_scribble
;
462 *SC
=(struct scsi_cmnd
*)ptr
->host_scribble
;
467 /* Resetting various pieces of the ESP scsi driver chipset/buses. */
468 static void esp_reset_dma(struct esp
*esp
)
470 int can_do_burst16
, can_do_burst32
, can_do_burst64
;
474 can_do_burst16
= (esp
->bursts
& DMA_BURST16
) != 0;
475 can_do_burst32
= (esp
->bursts
& DMA_BURST32
) != 0;
478 if (sbus_can_dma_64bit(esp
->sdev
))
480 if (sbus_can_burst64(esp
->sdev
))
481 can_do_burst64
= (esp
->bursts
& DMA_BURST64
) != 0;
483 /* Punt the DVMA into a known state. */
484 if (esp
->dma
->revision
!= dvmahme
) {
485 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
486 sbus_writel(tmp
| DMA_RST_SCSI
, esp
->dregs
+ DMA_CSR
);
487 sbus_writel(tmp
& ~DMA_RST_SCSI
, esp
->dregs
+ DMA_CSR
);
489 switch (esp
->dma
->revision
) {
491 /* This is the HME DVMA gate array. */
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
);
523 /* This is the gate array found in the sun4m
524 * NCR SBUS I/O subsystem.
526 if (esp
->erev
!= esp100
) {
527 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
528 sbus_writel(tmp
| DMA_3CLKS
, esp
->dregs
+ DMA_CSR
);
532 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
535 if (can_do_burst32
) {
539 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
542 /* This is the DMA unit found on SCSI/Ether cards. */
543 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
544 tmp
|= DMA_ADD_ENABLE
;
545 tmp
&= ~DMA_BCNT_ENAB
;
546 if (!can_do_burst32
&& can_do_burst16
) {
547 tmp
|= DMA_ESC_BURST
;
549 tmp
&= ~(DMA_ESC_BURST
);
551 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
556 ESP_INTSON(esp
->dregs
);
559 /* Reset the ESP chip, _not_ the SCSI bus. */
560 static void __init
esp_reset_esp(struct esp
*esp
)
562 u8 family_code
, version
;
565 /* Now reset the ESP chip */
566 esp_cmd(esp
, ESP_CMD_RC
);
567 esp_cmd(esp
, ESP_CMD_NULL
| ESP_CMD_DMA
);
568 esp_cmd(esp
, ESP_CMD_NULL
| ESP_CMD_DMA
);
570 /* Reload the configuration registers */
571 sbus_writeb(esp
->cfact
, esp
->eregs
+ ESP_CFACT
);
573 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
575 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
576 sbus_writeb(esp
->neg_defp
, esp
->eregs
+ ESP_TIMEO
);
578 /* This is the only point at which it is reliable to read
579 * the ID-code for a fast ESP chip variants.
581 esp
->max_period
= ((35 * esp
->ccycle
) / 1000);
582 if (esp
->erev
== fast
) {
583 version
= sbus_readb(esp
->eregs
+ ESP_UID
);
584 family_code
= (version
& 0xf8) >> 3;
585 if (family_code
== 0x02)
587 else if (family_code
== 0x0a)
588 esp
->erev
= fashme
; /* Version is usually '5'. */
591 ESPMISC(("esp%d: FAST chip is %s (family=%d, version=%d)\n",
593 (esp
->erev
== fas236
) ? "fas236" :
594 ((esp
->erev
== fas100a
) ? "fas100a" :
595 "fasHME"), family_code
, (version
& 7)));
597 esp
->min_period
= ((4 * esp
->ccycle
) / 1000);
599 esp
->min_period
= ((5 * esp
->ccycle
) / 1000);
601 esp
->max_period
= (esp
->max_period
+ 3)>>2;
602 esp
->min_period
= (esp
->min_period
+ 3)>>2;
604 sbus_writeb(esp
->config1
, esp
->eregs
+ ESP_CFG1
);
610 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
614 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
615 esp
->prev_cfg3
= esp
->config3
[0];
616 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
619 esp
->config2
|= (ESP_CONFIG2_HME32
| ESP_CONFIG2_HMEFENAB
);
622 /* Fast 236 or HME */
623 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
624 for (i
= 0; i
< 16; i
++) {
625 if (esp
->erev
== fashme
) {
628 cfg3
= ESP_CONFIG3_FCLOCK
| ESP_CONFIG3_OBPUSH
;
629 if (esp
->scsi_id
>= 8)
630 cfg3
|= ESP_CONFIG3_IDBIT3
;
631 esp
->config3
[i
] |= cfg3
;
633 esp
->config3
[i
] |= ESP_CONFIG3_FCLK
;
636 esp
->prev_cfg3
= esp
->config3
[0];
637 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
638 if (esp
->erev
== fashme
) {
649 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
650 for (i
= 0; i
< 16; i
++)
651 esp
->config3
[i
] |= ESP_CONFIG3_FCLOCK
;
652 esp
->prev_cfg3
= esp
->config3
[0];
653 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
657 panic("esp: what could it be... I wonder...");
661 /* Eat any bitrot in the chip */
662 sbus_readb(esp
->eregs
+ ESP_INTRPT
);
666 /* This places the ESP into a known state at boot time. */
667 static void __init
esp_bootup_reset(struct esp
*esp
)
677 /* Reset the SCSI bus, but tell ESP not to generate an irq */
678 tmp
= sbus_readb(esp
->eregs
+ ESP_CFG1
);
679 tmp
|= ESP_CONFIG1_SRRDISAB
;
680 sbus_writeb(tmp
, esp
->eregs
+ ESP_CFG1
);
682 esp_cmd(esp
, ESP_CMD_RS
);
685 sbus_writeb(esp
->config1
, esp
->eregs
+ ESP_CFG1
);
687 /* Eat any bitrot in the chip and we are done... */
688 sbus_readb(esp
->eregs
+ ESP_INTRPT
);
691 static int __init
esp_find_dvma(struct esp
*esp
, struct sbus_dev
*dma_sdev
)
693 struct sbus_dev
*sdev
= esp
->sdev
;
694 struct sbus_dma
*dma
;
696 if (dma_sdev
!= NULL
) {
698 if (dma
->sdev
== dma_sdev
)
703 /* If allocated already, can't use it. */
707 if (dma
->sdev
== NULL
)
710 /* If bus + slot are the same and it has the
711 * correct OBP name, it's ours.
713 if (sdev
->bus
== dma
->sdev
->bus
&&
714 sdev
->slot
== dma
->sdev
->slot
&&
715 (!strcmp(dma
->sdev
->prom_name
, "dma") ||
716 !strcmp(dma
->sdev
->prom_name
, "espdma")))
721 /* If we don't know how to handle the dvma,
722 * do not use this device.
725 printk("Cannot find dvma for ESP%d's SCSI\n", esp
->esp_id
);
728 if (dma
->allocated
) {
729 printk("esp%d: can't use my espdma\n", esp
->esp_id
);
734 esp
->dregs
= dma
->regs
;
739 static int __init
esp_map_regs(struct esp
*esp
, int hme
)
741 struct sbus_dev
*sdev
= esp
->sdev
;
742 struct resource
*res
;
744 /* On HME, two reg sets exist, first is DVMA,
745 * second is ESP registers.
748 res
= &sdev
->resource
[1];
750 res
= &sdev
->resource
[0];
752 esp
->eregs
= sbus_ioremap(res
, 0, ESP_REG_SIZE
, "ESP Registers");
759 static int __init
esp_map_cmdarea(struct esp
*esp
)
761 struct sbus_dev
*sdev
= esp
->sdev
;
763 esp
->esp_command
= sbus_alloc_consistent(sdev
, 16,
764 &esp
->esp_command_dvma
);
765 if (esp
->esp_command
== NULL
||
766 esp
->esp_command_dvma
== 0)
771 static int __init
esp_register_irq(struct esp
*esp
)
773 esp
->ehost
->irq
= esp
->irq
= esp
->sdev
->irqs
[0];
775 /* We used to try various overly-clever things to
776 * reduce the interrupt processing overhead on
777 * sun4c/sun4m when multiple ESP's shared the
778 * same IRQ. It was too complex and messy to
781 if (request_irq(esp
->ehost
->irq
, esp_intr
,
782 SA_SHIRQ
, "ESP SCSI", esp
)) {
783 printk("esp%d: Cannot acquire irq line\n",
788 printk("esp%d: IRQ %d ", esp
->esp_id
,
794 static void __init
esp_get_scsi_id(struct esp
*esp
)
796 struct sbus_dev
*sdev
= esp
->sdev
;
797 struct device_node
*dp
= sdev
->ofdev
.node
;
799 esp
->scsi_id
= of_getintprop_default(dp
,
802 if (esp
->scsi_id
== -1)
803 esp
->scsi_id
= of_getintprop_default(dp
,
806 if (esp
->scsi_id
== -1)
807 esp
->scsi_id
= (sdev
->bus
== NULL
) ? 7 :
808 of_getintprop_default(sdev
->bus
->ofdev
.node
,
811 esp
->ehost
->this_id
= esp
->scsi_id
;
812 esp
->scsi_id_mask
= (1 << esp
->scsi_id
);
816 static void __init
esp_get_clock_params(struct esp
*esp
)
818 struct sbus_dev
*sdev
= esp
->sdev
;
819 int prom_node
= esp
->prom_node
;
824 if (sdev
!= NULL
&& sdev
->bus
!= NULL
)
825 sbus_prom_node
= sdev
->bus
->prom_node
;
829 /* This is getting messy but it has to be done
830 * correctly or else you get weird behavior all
831 * over the place. We are trying to basically
832 * figure out three pieces of information.
834 * a) Clock Conversion Factor
836 * This is a representation of the input
837 * crystal clock frequency going into the
838 * ESP on this machine. Any operation whose
839 * timing is longer than 400ns depends on this
840 * value being correct. For example, you'll
841 * get blips for arbitration/selection during
842 * high load or with multiple targets if this
843 * is not set correctly.
845 * b) Selection Time-Out
847 * The ESP isn't very bright and will arbitrate
848 * for the bus and try to select a target
849 * forever if you let it. This value tells
850 * the ESP when it has taken too long to
851 * negotiate and that it should interrupt
852 * the CPU so we can see what happened.
853 * The value is computed as follows (from
854 * NCR/Symbios chip docs).
856 * (Time Out Period) * (Input Clock)
857 * STO = ----------------------------------
858 * (8192) * (Clock Conversion Factor)
860 * You usually want the time out period to be
861 * around 250ms, I think we'll set it a little
862 * bit higher to account for fully loaded SCSI
863 * bus's and slow devices that don't respond so
864 * quickly to selection attempts. (yeah, I know
865 * this is out of spec. but there is a lot of
866 * buggy pieces of firmware out there so bite me)
868 * c) Imperical constants for synchronous offset
869 * and transfer period register values
871 * This entails the smallest and largest sync
872 * period we could ever handle on this ESP.
875 fmhz
= prom_getintdefault(prom_node
, "clock-frequency", -1);
877 fmhz
= (!sbus_prom_node
) ? 0 :
878 prom_getintdefault(sbus_prom_node
, "clock-frequency", -1);
880 if (fmhz
<= (5000000))
883 ccf
= (((5000000 - 1) + (fmhz
))/(5000000));
885 if (!ccf
|| ccf
> 8) {
886 /* If we can't find anything reasonable,
887 * just assume 20MHZ. This is the clock
888 * frequency of the older sun4c's where I've
889 * been unable to find the clock-frequency
890 * PROM property. All other machines provide
891 * useful values it seems.
897 if (ccf
== (ESP_CCF_F7
+ 1))
898 esp
->cfact
= ESP_CCF_F0
;
899 else if (ccf
== ESP_CCF_NEVER
)
900 esp
->cfact
= ESP_CCF_F2
;
903 esp
->raw_cfact
= ccf
;
906 esp
->ccycle
= ESP_MHZ_TO_CYCLE(fmhz
);
907 esp
->ctick
= ESP_TICK(ccf
, esp
->ccycle
);
908 esp
->neg_defp
= ESP_NEG_DEFP(fmhz
, ccf
);
909 esp
->sync_defp
= SYNC_DEFP_SLOW
;
911 printk("SCSI ID %d Clk %dMHz CCYC=%d CCF=%d TOut %d ",
912 esp
->scsi_id
, (fmhz
/ 1000000),
913 (int)esp
->ccycle
, (int)ccf
, (int) esp
->neg_defp
);
916 static void __init
esp_get_bursts(struct esp
*esp
, struct sbus_dev
*dma
)
918 struct sbus_dev
*sdev
= esp
->sdev
;
921 bursts
= prom_getintdefault(esp
->prom_node
, "burst-sizes", 0xff);
924 u8 tmp
= prom_getintdefault(dma
->prom_node
,
925 "burst-sizes", 0xff);
931 u8 tmp
= prom_getintdefault(sdev
->bus
->prom_node
,
932 "burst-sizes", 0xff);
937 if (bursts
== 0xff ||
938 (bursts
& DMA_BURST16
) == 0 ||
939 (bursts
& DMA_BURST32
) == 0)
940 bursts
= (DMA_BURST32
- 1);
942 esp
->bursts
= bursts
;
945 static void __init
esp_get_revision(struct esp
*esp
)
949 esp
->config1
= (ESP_CONFIG1_PENABLE
| (esp
->scsi_id
& 7));
950 esp
->config2
= (ESP_CONFIG2_SCSI2ENAB
| ESP_CONFIG2_REGPARITY
);
951 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
953 tmp
= sbus_readb(esp
->eregs
+ ESP_CFG2
);
954 tmp
&= ~ESP_CONFIG2_MAGIC
;
955 if (tmp
!= (ESP_CONFIG2_SCSI2ENAB
| ESP_CONFIG2_REGPARITY
)) {
956 /* If what we write to cfg2 does not come back, cfg2
957 * is not implemented, therefore this must be a plain
961 printk("NCR53C90(esp100)\n");
964 esp
->prev_cfg3
= esp
->config3
[0] = 5;
965 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
966 sbus_writeb(0, esp
->eregs
+ ESP_CFG3
);
967 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
969 tmp
= sbus_readb(esp
->eregs
+ ESP_CFG3
);
971 /* The cfg2 register is implemented, however
972 * cfg3 is not, must be esp100a.
975 printk("NCR53C90A(esp100a)\n");
979 for (target
= 0; target
< 16; target
++)
980 esp
->config3
[target
] = 0;
982 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
984 /* All of cfg{1,2,3} implemented, must be one of
985 * the fas variants, figure out which one.
987 if (esp
->raw_cfact
> ESP_CCF_F5
) {
989 esp
->sync_defp
= SYNC_DEFP_FAST
;
990 printk("NCR53C9XF(espfast)\n");
993 printk("NCR53C9x(esp236)\n");
996 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
1001 static void __init
esp_init_swstate(struct esp
*esp
)
1005 /* Command queues... */
1006 esp
->current_SC
= NULL
;
1007 esp
->disconnected_SC
= NULL
;
1008 esp
->issue_SC
= NULL
;
1010 /* Target and current command state... */
1011 esp
->targets_present
= 0;
1012 esp
->resetting_bus
= 0;
1015 init_waitqueue_head(&esp
->reset_queue
);
1018 for(i
= 0; i
< 32; i
++)
1019 esp
->espcmdlog
[i
] = 0;
1022 /* MSG phase state... */
1023 for(i
= 0; i
< 16; i
++) {
1024 esp
->cur_msgout
[i
] = 0;
1025 esp
->cur_msgin
[i
] = 0;
1027 esp
->prevmsgout
= esp
->prevmsgin
= 0;
1028 esp
->msgout_len
= esp
->msgin_len
= 0;
1030 /* Clear the one behind caches to hold unmatchable values. */
1031 esp
->prev_soff
= esp
->prev_stp
= esp
->prev_cfg3
= 0xff;
1032 esp
->prev_hme_dmacsr
= 0xffffffff;
1035 static int __init
detect_one_esp(struct scsi_host_template
*tpnt
,
1037 struct sbus_dev
*esp_dev
,
1038 struct sbus_dev
*espdma
,
1039 struct sbus_bus
*sbus
,
1042 static int instance
;
1043 struct Scsi_Host
*esp_host
= scsi_host_alloc(tpnt
, sizeof(struct esp
));
1050 esp_host
->max_id
= 16;
1051 esp
= (struct esp
*) esp_host
->hostdata
;
1052 esp
->ehost
= esp_host
;
1053 esp
->sdev
= esp_dev
;
1054 esp
->esp_id
= instance
;
1055 esp
->prom_node
= esp_dev
->prom_node
;
1056 prom_getstring(esp
->prom_node
, "name", esp
->prom_name
,
1057 sizeof(esp
->prom_name
));
1059 if (esp_find_dvma(esp
, espdma
) < 0)
1061 if (esp_map_regs(esp
, hme
) < 0) {
1062 printk("ESP registers unmappable");
1063 goto fail_dvma_release
;
1065 if (esp_map_cmdarea(esp
) < 0) {
1066 printk("ESP DVMA transport area unmappable");
1067 goto fail_unmap_regs
;
1069 if (esp_register_irq(esp
) < 0)
1070 goto fail_unmap_cmdarea
;
1072 esp_get_scsi_id(esp
);
1074 esp
->diff
= prom_getbool(esp
->prom_node
, "differential");
1076 printk("Differential ");
1078 esp_get_clock_params(esp
);
1079 esp_get_bursts(esp
, espdma
);
1080 esp_get_revision(esp
);
1081 esp_init_swstate(esp
);
1083 esp_bootup_reset(esp
);
1085 if (scsi_add_host(esp_host
, dev
))
1088 dev_set_drvdata(&esp_dev
->ofdev
.dev
, esp
);
1090 scsi_scan_host(esp_host
);
1096 free_irq(esp
->ehost
->irq
, esp
);
1099 sbus_free_consistent(esp
->sdev
, 16,
1100 (void *) esp
->esp_command
,
1101 esp
->esp_command_dvma
);
1104 sbus_iounmap(esp
->eregs
, ESP_REG_SIZE
);
1107 esp
->dma
->allocated
= 0;
1110 scsi_host_put(esp_host
);
1114 /* Detecting ESP chips on the machine. This is the simple and easy
1117 static int __devexit
esp_remove_common(struct esp
*esp
)
1119 unsigned int irq
= esp
->ehost
->irq
;
1121 scsi_remove_host(esp
->ehost
);
1123 scsi_host_put(esp
->ehost
);
1126 ESP_INTSOFF(esp
->dregs
);
1133 sbus_free_consistent(esp
->sdev
, 16,
1134 (void *) esp
->esp_command
, esp
->esp_command_dvma
);
1135 sbus_iounmap(esp
->eregs
, ESP_REG_SIZE
);
1136 esp
->dma
->allocated
= 0;
1146 #include <asm/sun4paddr.h>
1148 static struct sbus_dev sun4_esp_dev
;
1150 static int __init
esp_sun4_probe(struct scsi_host_template
*tpnt
)
1152 if (sun4_esp_physaddr
) {
1153 memset(&sun4_esp_dev
, 0, sizeof(esp_dev
));
1154 sun4_esp_dev
.reg_addrs
[0].phys_addr
= sun4_esp_physaddr
;
1155 sun4_esp_dev
.irqs
[0] = 4;
1156 sun4_esp_dev
.resource
[0].start
= sun4_esp_physaddr
;
1157 sun4_esp_dev
.resource
[0].end
=
1158 sun4_esp_physaddr
+ ESP_REG_SIZE
- 1;
1159 sun4_esp_dev
.resource
[0].flags
= IORESOURCE_IO
;
1161 return detect_one_esp(tpnt
, NULL
,
1162 &sun4_esp_dev
, NULL
, NULL
, 0);
1167 static int __devexit
esp_sun4_remove(void)
1169 struct esp
*esp
= dev_get_drvdata(&dev
->dev
);
1171 return esp_remove_common(esp
);
1174 #else /* !CONFIG_SUN4 */
1176 static int __devinit
esp_sbus_probe(struct of_device
*dev
, const struct of_device_id
*match
)
1178 struct sbus_dev
*sdev
= to_sbus_device(&dev
->dev
);
1179 struct device_node
*dp
= dev
->node
;
1180 struct sbus_dev
*dma_sdev
= NULL
;
1184 (!strcmp(dp
->parent
->name
, "espdma") ||
1185 !strcmp(dp
->parent
->name
, "dma")))
1186 dma_sdev
= sdev
->parent
;
1187 else if (!strcmp(dp
->name
, "SUNW,fas")) {
1192 return detect_one_esp(match
->data
, &dev
->dev
,
1193 sdev
, dma_sdev
, sdev
->bus
, hme
);
1196 static int __devexit
esp_sbus_remove(struct of_device
*dev
)
1198 struct esp
*esp
= dev_get_drvdata(&dev
->dev
);
1200 return esp_remove_common(esp
);
1203 #endif /* !CONFIG_SUN4 */
1205 /* The info function will return whatever useful
1206 * information the developer sees fit. If not provided, then
1207 * the name field will be used instead.
1209 static const char *esp_info(struct Scsi_Host
*host
)
1213 esp
= (struct esp
*) host
->hostdata
;
1214 switch (esp
->erev
) {
1216 return "Sparc ESP100 (NCR53C90)";
1218 return "Sparc ESP100A (NCR53C90A)";
1220 return "Sparc ESP236";
1222 return "Sparc ESP236-FAST";
1224 return "Sparc ESP366-HME";
1226 return "Sparc ESP100A-FAST";
1228 return "Bogon ESP revision";
1232 /* From Wolfgang Stanglmeier's NCR scsi driver. */
1241 static void copy_mem_info(struct info_str
*info
, char *data
, int len
)
1243 if (info
->pos
+ len
> info
->length
)
1244 len
= info
->length
- info
->pos
;
1246 if (info
->pos
+ len
< info
->offset
) {
1250 if (info
->pos
< info
->offset
) {
1251 data
+= (info
->offset
- info
->pos
);
1252 len
-= (info
->offset
- info
->pos
);
1256 memcpy(info
->buffer
+ info
->pos
, data
, len
);
1261 static int copy_info(struct info_str
*info
, char *fmt
, ...)
1267 va_start(args
, fmt
);
1268 len
= vsprintf(buf
, fmt
, args
);
1271 copy_mem_info(info
, buf
, len
);
1275 static int esp_host_info(struct esp
*esp
, char *ptr
, off_t offset
, int len
)
1277 struct scsi_device
*sdev
;
1278 struct info_str info
;
1283 info
.offset
= offset
;
1286 copy_info(&info
, "Sparc ESP Host Adapter:\n");
1287 copy_info(&info
, "\tPROM node\t\t%08x\n", (unsigned int) esp
->prom_node
);
1288 copy_info(&info
, "\tPROM name\t\t%s\n", esp
->prom_name
);
1289 copy_info(&info
, "\tESP Model\t\t");
1290 switch (esp
->erev
) {
1292 copy_info(&info
, "ESP100\n");
1295 copy_info(&info
, "ESP100A\n");
1298 copy_info(&info
, "ESP236\n");
1301 copy_info(&info
, "FAS236\n");
1304 copy_info(&info
, "FAS100A\n");
1307 copy_info(&info
, "FAST\n");
1310 copy_info(&info
, "Happy Meal FAS\n");
1314 copy_info(&info
, "Unknown!\n");
1317 copy_info(&info
, "\tDMA Revision\t\t");
1318 switch (esp
->dma
->revision
) {
1320 copy_info(&info
, "Rev 0\n");
1323 copy_info(&info
, "ESC Rev 1\n");
1326 copy_info(&info
, "Rev 1\n");
1329 copy_info(&info
, "Rev 2\n");
1332 copy_info(&info
, "Rev 3\n");
1335 copy_info(&info
, "Rev 1+\n");
1338 copy_info(&info
, "Rev HME/FAS\n");
1341 copy_info(&info
, "Unknown!\n");
1344 copy_info(&info
, "\tLive Targets\t\t[ ");
1345 for (i
= 0; i
< 15; i
++) {
1346 if (esp
->targets_present
& (1 << i
))
1347 copy_info(&info
, "%d ", i
);
1349 copy_info(&info
, "]\n\n");
1351 /* Now describe the state of each existing target. */
1352 copy_info(&info
, "Target #\tconfig3\t\tSync Capabilities\tDisconnect\tWide\n");
1354 shost_for_each_device(sdev
, esp
->ehost
) {
1355 struct esp_device
*esp_dev
= sdev
->hostdata
;
1358 if (!(esp
->targets_present
& (1 << id
)))
1361 copy_info(&info
, "%d\t\t", id
);
1362 copy_info(&info
, "%08lx\t", esp
->config3
[id
]);
1363 copy_info(&info
, "[%02lx,%02lx]\t\t\t",
1364 esp_dev
->sync_max_offset
,
1365 esp_dev
->sync_min_period
);
1366 copy_info(&info
, "%s\t\t",
1367 esp_dev
->disconnect
? "yes" : "no");
1368 copy_info(&info
, "%s\n",
1369 (esp
->config3
[id
] & ESP_CONFIG3_EWIDE
) ? "yes" : "no");
1371 return info
.pos
> info
.offset
? info
.pos
- info
.offset
: 0;
1374 /* ESP proc filesystem code. */
1375 static int esp_proc_info(struct Scsi_Host
*host
, char *buffer
, char **start
, off_t offset
,
1376 int length
, int inout
)
1378 struct esp
*esp
= (struct esp
*) host
->hostdata
;
1381 return -EINVAL
; /* not yet */
1386 return esp_host_info(esp
, buffer
, offset
, length
);
1389 static void esp_get_dmabufs(struct esp
*esp
, struct scsi_cmnd
*sp
)
1391 if (sp
->use_sg
== 0) {
1392 sp
->SCp
.this_residual
= sp
->request_bufflen
;
1393 sp
->SCp
.buffer
= (struct scatterlist
*) sp
->request_buffer
;
1394 sp
->SCp
.buffers_residual
= 0;
1395 if (sp
->request_bufflen
) {
1396 sp
->SCp
.have_data_in
= sbus_map_single(esp
->sdev
, sp
->SCp
.buffer
,
1397 sp
->SCp
.this_residual
,
1398 sp
->sc_data_direction
);
1399 sp
->SCp
.ptr
= (char *) ((unsigned long)sp
->SCp
.have_data_in
);
1404 sp
->SCp
.buffer
= (struct scatterlist
*) sp
->buffer
;
1405 sp
->SCp
.buffers_residual
= sbus_map_sg(esp
->sdev
,
1408 sp
->sc_data_direction
);
1409 sp
->SCp
.this_residual
= sg_dma_len(sp
->SCp
.buffer
);
1410 sp
->SCp
.ptr
= (char *) ((unsigned long)sg_dma_address(sp
->SCp
.buffer
));
1414 static void esp_release_dmabufs(struct esp
*esp
, struct scsi_cmnd
*sp
)
1417 sbus_unmap_sg(esp
->sdev
, sp
->buffer
, sp
->use_sg
,
1418 sp
->sc_data_direction
);
1419 } else if (sp
->request_bufflen
) {
1420 sbus_unmap_single(esp
->sdev
,
1421 sp
->SCp
.have_data_in
,
1422 sp
->request_bufflen
,
1423 sp
->sc_data_direction
);
1427 static void esp_restore_pointers(struct esp
*esp
, struct scsi_cmnd
*sp
)
1429 struct esp_pointers
*ep
= &esp
->data_pointers
[sp
->device
->id
];
1431 sp
->SCp
.ptr
= ep
->saved_ptr
;
1432 sp
->SCp
.buffer
= ep
->saved_buffer
;
1433 sp
->SCp
.this_residual
= ep
->saved_this_residual
;
1434 sp
->SCp
.buffers_residual
= ep
->saved_buffers_residual
;
1437 static void esp_save_pointers(struct esp
*esp
, struct scsi_cmnd
*sp
)
1439 struct esp_pointers
*ep
= &esp
->data_pointers
[sp
->device
->id
];
1441 ep
->saved_ptr
= sp
->SCp
.ptr
;
1442 ep
->saved_buffer
= sp
->SCp
.buffer
;
1443 ep
->saved_this_residual
= sp
->SCp
.this_residual
;
1444 ep
->saved_buffers_residual
= sp
->SCp
.buffers_residual
;
1449 * 1) Never ever panic while something is live on the bus.
1450 * If there is to be any chance of syncing the disks this
1451 * rule is to be obeyed.
1453 * 2) Any target that causes a foul condition will no longer
1454 * have synchronous transfers done to it, no questions
1457 * 3) Keep register accesses to a minimum. Think about some
1458 * day when we have Xbus machines this is running on and
1459 * the ESP chip is on the other end of the machine on a
1460 * different board from the cpu where this is running.
1463 /* Fire off a command. We assume the bus is free and that the only
1464 * case where we could see an interrupt is where we have disconnected
1465 * commands active and they are trying to reselect us.
1467 static inline void esp_check_cmd(struct esp
*esp
, struct scsi_cmnd
*sp
)
1469 switch (sp
->cmd_len
) {
1473 esp
->esp_slowcmd
= 0;
1477 esp
->esp_slowcmd
= 1;
1478 esp
->esp_scmdleft
= sp
->cmd_len
;
1479 esp
->esp_scmdp
= &sp
->cmnd
[0];
1484 static inline void build_sync_nego_msg(struct esp
*esp
, int period
, int offset
)
1486 esp
->cur_msgout
[0] = EXTENDED_MESSAGE
;
1487 esp
->cur_msgout
[1] = 3;
1488 esp
->cur_msgout
[2] = EXTENDED_SDTR
;
1489 esp
->cur_msgout
[3] = period
;
1490 esp
->cur_msgout
[4] = offset
;
1491 esp
->msgout_len
= 5;
1494 /* SIZE is in bits, currently HME only supports 16 bit wide transfers. */
1495 static inline void build_wide_nego_msg(struct esp
*esp
, int size
)
1497 esp
->cur_msgout
[0] = EXTENDED_MESSAGE
;
1498 esp
->cur_msgout
[1] = 2;
1499 esp
->cur_msgout
[2] = EXTENDED_WDTR
;
1502 esp
->cur_msgout
[3] = 2;
1505 esp
->cur_msgout
[3] = 1;
1509 esp
->cur_msgout
[3] = 0;
1513 esp
->msgout_len
= 4;
1516 static void esp_exec_cmd(struct esp
*esp
)
1518 struct scsi_cmnd
*SCptr
;
1519 struct scsi_device
*SDptr
;
1520 struct esp_device
*esp_dev
;
1521 volatile u8
*cmdp
= esp
->esp_command
;
1526 /* Hold off if we have disconnected commands and
1527 * an IRQ is showing...
1529 if (esp
->disconnected_SC
&& ESP_IRQ_P(esp
->dregs
))
1532 /* Grab first member of the issue queue. */
1533 SCptr
= esp
->current_SC
= remove_first_SC(&esp
->issue_SC
);
1535 /* Safe to panic here because current_SC is null. */
1537 panic("esp: esp_exec_cmd and issue queue is NULL");
1539 SDptr
= SCptr
->device
;
1540 esp_dev
= SDptr
->hostdata
;
1541 lun
= SCptr
->device
->lun
;
1542 target
= SCptr
->device
->id
;
1545 esp
->msgout_len
= 0;
1547 /* Send it out whole, or piece by piece? The ESP
1548 * only knows how to automatically send out 6, 10,
1549 * and 12 byte commands. I used to think that the
1550 * Linux SCSI code would never throw anything other
1551 * than that to us, but then again there is the
1552 * SCSI generic driver which can send us anything.
1554 esp_check_cmd(esp
, SCptr
);
1556 /* If arbitration/selection is successful, the ESP will leave
1557 * ATN asserted, causing the target to go into message out
1558 * phase. The ESP will feed the target the identify and then
1559 * the target can only legally go to one of command,
1560 * datain/out, status, or message in phase, or stay in message
1561 * out phase (should we be trying to send a sync negotiation
1562 * message after the identify). It is not allowed to drop
1563 * BSY, but some buggy targets do and we check for this
1564 * condition in the selection complete code. Most of the time
1565 * we'll make the command bytes available to the ESP and it
1566 * will not interrupt us until it finishes command phase, we
1567 * cannot do this for command sizes the ESP does not
1568 * understand and in this case we'll get interrupted right
1569 * when the target goes into command phase.
1571 * It is absolutely _illegal_ in the presence of SCSI-2 devices
1572 * to use the ESP select w/o ATN command. When SCSI-2 devices are
1573 * present on the bus we _must_ always go straight to message out
1574 * phase with an identify message for the target. Being that
1575 * selection attempts in SCSI-1 w/o ATN was an option, doing SCSI-2
1576 * selections should not confuse SCSI-1 we hope.
1579 if (esp_dev
->sync
) {
1580 /* this targets sync is known */
1581 #ifndef __sparc_v9__
1584 if (esp_dev
->disconnect
)
1585 *cmdp
++ = IDENTIFY(1, lun
);
1587 *cmdp
++ = IDENTIFY(0, lun
);
1589 if (esp
->esp_slowcmd
) {
1590 the_esp_command
= (ESP_CMD_SELAS
| ESP_CMD_DMA
);
1591 esp_advance_phase(SCptr
, in_slct_stop
);
1593 the_esp_command
= (ESP_CMD_SELA
| ESP_CMD_DMA
);
1594 esp_advance_phase(SCptr
, in_slct_norm
);
1596 } else if (!(esp
->targets_present
& (1<<target
)) || !(esp_dev
->disconnect
)) {
1597 /* After the bootup SCSI code sends both the
1598 * TEST_UNIT_READY and INQUIRY commands we want
1599 * to at least attempt allowing the device to
1602 ESPMISC(("esp: Selecting device for first time. target=%d "
1603 "lun=%d\n", target
, SCptr
->device
->lun
));
1604 if (!SDptr
->borken
&& !esp_dev
->disconnect
)
1605 esp_dev
->disconnect
= 1;
1607 *cmdp
++ = IDENTIFY(0, lun
);
1608 esp
->prevmsgout
= NOP
;
1609 esp_advance_phase(SCptr
, in_slct_norm
);
1610 the_esp_command
= (ESP_CMD_SELA
| ESP_CMD_DMA
);
1612 /* Take no chances... */
1613 esp_dev
->sync_max_offset
= 0;
1614 esp_dev
->sync_min_period
= 0;
1616 /* Sorry, I have had way too many problems with
1617 * various CDROM devices on ESP. -DaveM
1619 int cdrom_hwbug_wkaround
= 0;
1621 #ifndef __sparc_v9__
1622 /* Never allow disconnects or synchronous transfers on
1623 * SparcStation1 and SparcStation1+. Allowing those
1624 * to be enabled seems to lockup the machine completely.
1626 if ((idprom
->id_machtype
== (SM_SUN4C
| SM_4C_SS1
)) ||
1627 (idprom
->id_machtype
== (SM_SUN4C
| SM_4C_SS1PLUS
))) {
1628 /* But we are nice and allow tapes and removable
1629 * disks (but not CDROMs) to disconnect.
1631 if(SDptr
->type
== TYPE_TAPE
||
1632 (SDptr
->type
!= TYPE_ROM
&& SDptr
->removable
))
1633 esp_dev
->disconnect
= 1;
1635 esp_dev
->disconnect
= 0;
1636 esp_dev
->sync_max_offset
= 0;
1637 esp_dev
->sync_min_period
= 0;
1642 #endif /* !(__sparc_v9__) */
1644 /* We've talked to this guy before,
1645 * but never negotiated. Let's try,
1646 * need to attempt WIDE first, before
1647 * sync nego, as per SCSI 2 standard.
1649 if (esp
->erev
== fashme
&& !esp_dev
->wide
) {
1650 if (!SDptr
->borken
&&
1651 SDptr
->type
!= TYPE_ROM
&&
1652 SDptr
->removable
== 0) {
1653 build_wide_nego_msg(esp
, 16);
1656 goto after_nego_msg_built
;
1659 /* Fall through and try sync. */
1663 if (!SDptr
->borken
) {
1664 if ((SDptr
->type
== TYPE_ROM
)) {
1665 /* Nice try sucker... */
1666 ESPMISC(("esp%d: Disabling sync for buggy "
1667 "CDROM.\n", esp
->esp_id
));
1668 cdrom_hwbug_wkaround
= 1;
1669 build_sync_nego_msg(esp
, 0, 0);
1670 } else if (SDptr
->removable
!= 0) {
1671 ESPMISC(("esp%d: Not negotiating sync/wide but "
1672 "allowing disconnect for removable media.\n",
1674 build_sync_nego_msg(esp
, 0, 0);
1676 build_sync_nego_msg(esp
, esp
->sync_defp
, 15);
1679 build_sync_nego_msg(esp
, 0, 0);
1684 after_nego_msg_built
:
1685 /* A fix for broken SCSI1 targets, when they disconnect
1686 * they lock up the bus and confuse ESP. So disallow
1687 * disconnects for SCSI1 targets for now until we
1688 * find a better fix.
1690 * Addendum: This is funny, I figured out what was going
1691 * on. The blotzed SCSI1 target would disconnect,
1692 * one of the other SCSI2 targets or both would be
1693 * disconnected as well. The SCSI1 target would
1694 * stay disconnected long enough that we start
1695 * up a command on one of the SCSI2 targets. As
1696 * the ESP is arbitrating for the bus the SCSI1
1697 * target begins to arbitrate as well to reselect
1698 * the ESP. The SCSI1 target refuses to drop it's
1699 * ID bit on the data bus even though the ESP is
1700 * at ID 7 and is the obvious winner for any
1701 * arbitration. The ESP is a poor sport and refuses
1702 * to lose arbitration, it will continue indefinitely
1703 * trying to arbitrate for the bus and can only be
1704 * stopped via a chip reset or SCSI bus reset.
1705 * Therefore _no_ disconnects for SCSI1 targets
1706 * thank you very much. ;-)
1708 if(((SDptr
->scsi_level
< 3) &&
1709 (SDptr
->type
!= TYPE_TAPE
) &&
1710 SDptr
->removable
== 0) ||
1711 cdrom_hwbug_wkaround
|| SDptr
->borken
) {
1712 ESPMISC((KERN_INFO
"esp%d: Disabling DISCONNECT for target %d "
1713 "lun %d\n", esp
->esp_id
, SCptr
->device
->id
, SCptr
->device
->lun
));
1714 esp_dev
->disconnect
= 0;
1715 *cmdp
++ = IDENTIFY(0, lun
);
1717 *cmdp
++ = IDENTIFY(1, lun
);
1720 /* ESP fifo is only so big...
1721 * Make this look like a slow command.
1723 esp
->esp_slowcmd
= 1;
1724 esp
->esp_scmdleft
= SCptr
->cmd_len
;
1725 esp
->esp_scmdp
= &SCptr
->cmnd
[0];
1727 the_esp_command
= (ESP_CMD_SELAS
| ESP_CMD_DMA
);
1728 esp_advance_phase(SCptr
, in_slct_msg
);
1731 if (!esp
->esp_slowcmd
)
1732 for (i
= 0; i
< SCptr
->cmd_len
; i
++)
1733 *cmdp
++ = SCptr
->cmnd
[i
];
1736 if (esp
->erev
== fashme
)
1737 sbus_writeb((target
& 0xf) | (ESP_BUSID_RESELID
| ESP_BUSID_CTR32BIT
),
1738 esp
->eregs
+ ESP_BUSID
);
1740 sbus_writeb(target
& 7, esp
->eregs
+ ESP_BUSID
);
1741 if (esp
->prev_soff
!= esp_dev
->sync_max_offset
||
1742 esp
->prev_stp
!= esp_dev
->sync_min_period
||
1743 (esp
->erev
> esp100a
&&
1744 esp
->prev_cfg3
!= esp
->config3
[target
])) {
1745 esp
->prev_soff
= esp_dev
->sync_max_offset
;
1746 esp
->prev_stp
= esp_dev
->sync_min_period
;
1747 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
1748 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
1749 if (esp
->erev
> esp100a
) {
1750 esp
->prev_cfg3
= esp
->config3
[target
];
1751 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
1754 i
= (cmdp
- esp
->esp_command
);
1756 if (esp
->erev
== fashme
) {
1757 esp_cmd(esp
, ESP_CMD_FLUSH
); /* Grrr! */
1759 /* Set up the DMA and HME counters */
1760 sbus_writeb(i
, esp
->eregs
+ ESP_TCLOW
);
1761 sbus_writeb(0, esp
->eregs
+ ESP_TCMED
);
1762 sbus_writeb(0, esp
->eregs
+ FAS_RLO
);
1763 sbus_writeb(0, esp
->eregs
+ FAS_RHI
);
1764 esp_cmd(esp
, the_esp_command
);
1766 /* Talk about touchy hardware... */
1767 esp
->prev_hme_dmacsr
= ((esp
->prev_hme_dmacsr
|
1768 (DMA_SCSI_DISAB
| DMA_ENABLE
)) &
1770 sbus_writel(16, esp
->dregs
+ DMA_COUNT
);
1771 sbus_writel(esp
->esp_command_dvma
, esp
->dregs
+ DMA_ADDR
);
1772 sbus_writel(esp
->prev_hme_dmacsr
, esp
->dregs
+ DMA_CSR
);
1776 /* Set up the DMA and ESP counters */
1777 sbus_writeb(i
, esp
->eregs
+ ESP_TCLOW
);
1778 sbus_writeb(0, esp
->eregs
+ ESP_TCMED
);
1779 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
1780 tmp
&= ~DMA_ST_WRITE
;
1782 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
1783 if (esp
->dma
->revision
== dvmaesc1
) {
1784 if (i
) /* Workaround ESC gate array SBUS rerun bug. */
1785 sbus_writel(PAGE_SIZE
, esp
->dregs
+ DMA_COUNT
);
1787 sbus_writel(esp
->esp_command_dvma
, esp
->dregs
+ DMA_ADDR
);
1789 /* Tell ESP to "go". */
1790 esp_cmd(esp
, the_esp_command
);
1794 /* Queue a SCSI command delivered from the mid-level Linux SCSI code. */
1795 static int esp_queue(struct scsi_cmnd
*SCpnt
, void (*done
)(struct scsi_cmnd
*))
1799 /* Set up func ptr and initial driver cmd-phase. */
1800 SCpnt
->scsi_done
= done
;
1801 SCpnt
->SCp
.phase
= not_issued
;
1803 /* We use the scratch area. */
1804 ESPQUEUE(("esp_queue: target=%d lun=%d ", SCpnt
->device
->id
, SCpnt
->device
->lun
));
1805 ESPDISC(("N<%02x,%02x>", SCpnt
->device
->id
, SCpnt
->device
->lun
));
1807 esp
= (struct esp
*) SCpnt
->device
->host
->hostdata
;
1808 esp_get_dmabufs(esp
, SCpnt
);
1809 esp_save_pointers(esp
, SCpnt
); /* FIXME for tag queueing */
1811 SCpnt
->SCp
.Status
= CHECK_CONDITION
;
1812 SCpnt
->SCp
.Message
= 0xff;
1813 SCpnt
->SCp
.sent_command
= 0;
1815 /* Place into our queue. */
1816 if (SCpnt
->cmnd
[0] == REQUEST_SENSE
) {
1817 ESPQUEUE(("RQSENSE\n"));
1818 prepend_SC(&esp
->issue_SC
, SCpnt
);
1821 append_SC(&esp
->issue_SC
, SCpnt
);
1824 /* Run it now if we can. */
1825 if (!esp
->current_SC
&& !esp
->resetting_bus
)
1831 /* Dump driver state. */
1832 static void esp_dump_cmd(struct scsi_cmnd
*SCptr
)
1834 ESPLOG(("[tgt<%02x> lun<%02x> "
1835 "pphase<%s> cphase<%s>]",
1836 SCptr
->device
->id
, SCptr
->device
->lun
,
1837 phase_string(SCptr
->SCp
.sent_command
),
1838 phase_string(SCptr
->SCp
.phase
)));
1841 static void esp_dump_state(struct esp
*esp
)
1843 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
1844 #ifdef DEBUG_ESP_CMDS
1848 ESPLOG(("esp%d: dumping state\n", esp
->esp_id
));
1849 ESPLOG(("esp%d: dma -- cond_reg<%08x> addr<%08x>\n",
1851 sbus_readl(esp
->dregs
+ DMA_CSR
),
1852 sbus_readl(esp
->dregs
+ DMA_ADDR
)));
1853 ESPLOG(("esp%d: SW [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
1854 esp
->esp_id
, esp
->sreg
, esp
->seqreg
, esp
->ireg
));
1855 ESPLOG(("esp%d: HW reread [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
1857 sbus_readb(esp
->eregs
+ ESP_STATUS
),
1858 sbus_readb(esp
->eregs
+ ESP_SSTEP
),
1859 sbus_readb(esp
->eregs
+ ESP_INTRPT
)));
1860 #ifdef DEBUG_ESP_CMDS
1861 printk("esp%d: last ESP cmds [", esp
->esp_id
);
1862 i
= (esp
->espcmdent
- 1) & 31;
1863 printk("<"); esp_print_cmd(esp
->espcmdlog
[i
]); printk(">");
1865 printk("<"); esp_print_cmd(esp
->espcmdlog
[i
]); printk(">");
1867 printk("<"); esp_print_cmd(esp
->espcmdlog
[i
]); printk(">");
1869 printk("<"); esp_print_cmd(esp
->espcmdlog
[i
]); printk(">");
1871 #endif /* (DEBUG_ESP_CMDS) */
1874 ESPLOG(("esp%d: current command ", esp
->esp_id
));
1875 esp_dump_cmd(SCptr
);
1878 SCptr
= esp
->disconnected_SC
;
1879 ESPLOG(("esp%d: disconnected ", esp
->esp_id
));
1881 esp_dump_cmd(SCptr
);
1882 SCptr
= (struct scsi_cmnd
*) SCptr
->host_scribble
;
1887 /* Abort a command. The host_lock is acquired by caller. */
1888 static int esp_abort(struct scsi_cmnd
*SCptr
)
1890 struct esp
*esp
= (struct esp
*) SCptr
->device
->host
->hostdata
;
1893 ESPLOG(("esp%d: Aborting command\n", esp
->esp_id
));
1894 esp_dump_state(esp
);
1896 /* Wheee, if this is the current command on the bus, the
1897 * best we can do is assert ATN and wait for msgout phase.
1898 * This should even fix a hung SCSI bus when we lose state
1899 * in the driver and timeout because the eventual phase change
1900 * will cause the ESP to (eventually) give an interrupt.
1902 if (esp
->current_SC
== SCptr
) {
1903 esp
->cur_msgout
[0] = ABORT
;
1904 esp
->msgout_len
= 1;
1905 esp
->msgout_ctr
= 0;
1906 esp_cmd(esp
, ESP_CMD_SATN
);
1910 /* If it is still in the issue queue then we can safely
1911 * call the completion routine and report abort success.
1913 don
= (sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_INT_ENAB
);
1915 ESP_INTSOFF(esp
->dregs
);
1917 if (esp
->issue_SC
) {
1918 struct scsi_cmnd
**prev
, *this;
1919 for (prev
= (&esp
->issue_SC
), this = esp
->issue_SC
;
1921 prev
= (struct scsi_cmnd
**) &(this->host_scribble
),
1922 this = (struct scsi_cmnd
*) this->host_scribble
) {
1924 if (this == SCptr
) {
1925 *prev
= (struct scsi_cmnd
*) this->host_scribble
;
1926 this->host_scribble
= NULL
;
1928 esp_release_dmabufs(esp
, this);
1929 this->result
= DID_ABORT
<< 16;
1930 this->scsi_done(this);
1933 ESP_INTSON(esp
->dregs
);
1940 /* Yuck, the command to abort is disconnected, it is not
1941 * worth trying to abort it now if something else is live
1942 * on the bus at this time. So, we let the SCSI code wait
1943 * a little bit and try again later.
1945 if (esp
->current_SC
) {
1947 ESP_INTSON(esp
->dregs
);
1951 /* It's disconnected, we have to reconnect to re-establish
1952 * the nexus and tell the device to abort. However, we really
1953 * cannot 'reconnect' per se. Don't try to be fancy, just
1954 * indicate failure, which causes our caller to reset the whole
1959 ESP_INTSON(esp
->dregs
);
1964 /* We've sent ESP_CMD_RS to the ESP, the interrupt had just
1965 * arrived indicating the end of the SCSI bus reset. Our job
1966 * is to clean out the command queues and begin re-execution
1967 * of SCSI commands once more.
1969 static int esp_finish_reset(struct esp
*esp
)
1971 struct scsi_cmnd
*sp
= esp
->current_SC
;
1973 /* Clean up currently executing command, if any. */
1975 esp
->current_SC
= NULL
;
1977 esp_release_dmabufs(esp
, sp
);
1978 sp
->result
= (DID_RESET
<< 16);
1983 /* Clean up disconnected queue, they have been invalidated
1986 if (esp
->disconnected_SC
) {
1987 while ((sp
= remove_first_SC(&esp
->disconnected_SC
)) != NULL
) {
1988 esp_release_dmabufs(esp
, sp
);
1989 sp
->result
= (DID_RESET
<< 16);
1995 /* SCSI bus reset is complete. */
1996 esp
->resetting_bus
= 0;
1997 wake_up(&esp
->reset_queue
);
1999 /* Ok, now it is safe to get commands going once more. */
2006 static int esp_do_resetbus(struct esp
*esp
)
2008 ESPLOG(("esp%d: Resetting scsi bus\n", esp
->esp_id
));
2009 esp
->resetting_bus
= 1;
2010 esp_cmd(esp
, ESP_CMD_RS
);
2015 /* Reset ESP chip, reset hanging bus, then kill active and
2016 * disconnected commands for targets without soft reset.
2018 * The host_lock is acquired by caller.
2020 static int esp_reset(struct scsi_cmnd
*SCptr
)
2022 struct esp
*esp
= (struct esp
*) SCptr
->device
->host
->hostdata
;
2024 spin_lock_irq(esp
->ehost
->host_lock
);
2025 (void) esp_do_resetbus(esp
);
2026 spin_unlock_irq(esp
->ehost
->host_lock
);
2028 wait_event(esp
->reset_queue
, (esp
->resetting_bus
== 0));
2033 /* Internal ESP done function. */
2034 static void esp_done(struct esp
*esp
, int error
)
2036 struct scsi_cmnd
*done_SC
= esp
->current_SC
;
2038 esp
->current_SC
= NULL
;
2040 esp_release_dmabufs(esp
, done_SC
);
2041 done_SC
->result
= error
;
2043 done_SC
->scsi_done(done_SC
);
2045 /* Bus is free, issue any commands in the queue. */
2046 if (esp
->issue_SC
&& !esp
->current_SC
)
2051 /* Wheee, ESP interrupt engine. */
2053 /* Forward declarations. */
2054 static int esp_do_phase_determine(struct esp
*esp
);
2055 static int esp_do_data_finale(struct esp
*esp
);
2056 static int esp_select_complete(struct esp
*esp
);
2057 static int esp_do_status(struct esp
*esp
);
2058 static int esp_do_msgin(struct esp
*esp
);
2059 static int esp_do_msgindone(struct esp
*esp
);
2060 static int esp_do_msgout(struct esp
*esp
);
2061 static int esp_do_cmdbegin(struct esp
*esp
);
2063 #define sreg_datainp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DIP)
2064 #define sreg_dataoutp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DOP)
2066 /* Read any bytes found in the FAS366 fifo, storing them into
2067 * the ESP driver software state structure.
2069 static void hme_fifo_read(struct esp
*esp
)
2072 u8 status
= esp
->sreg
;
2074 /* Cannot safely frob the fifo for these following cases, but
2075 * we must always read the fifo when the reselect interrupt
2078 if (((esp
->ireg
& ESP_INTR_RSEL
) == 0) &&
2079 (sreg_datainp(status
) ||
2080 sreg_dataoutp(status
) ||
2082 esp
->current_SC
->SCp
.phase
== in_data_done
))) {
2083 ESPHME(("<wkaround_skipped>"));
2085 unsigned long fcnt
= sbus_readb(esp
->eregs
+ ESP_FFLAGS
) & ESP_FF_FBYTES
;
2087 /* The HME stores bytes in multiples of 2 in the fifo. */
2088 ESPHME(("hme_fifo[fcnt=%d", (int)fcnt
));
2090 esp
->hme_fifo_workaround_buffer
[count
++] =
2091 sbus_readb(esp
->eregs
+ ESP_FDATA
);
2092 esp
->hme_fifo_workaround_buffer
[count
++] =
2093 sbus_readb(esp
->eregs
+ ESP_FDATA
);
2094 ESPHME(("<%02x,%02x>", esp
->hme_fifo_workaround_buffer
[count
-2], esp
->hme_fifo_workaround_buffer
[count
-1]));
2097 if (sbus_readb(esp
->eregs
+ ESP_STATUS2
) & ESP_STAT2_F1BYTE
) {
2098 ESPHME(("<poke_byte>"));
2099 sbus_writeb(0, esp
->eregs
+ ESP_FDATA
);
2100 esp
->hme_fifo_workaround_buffer
[count
++] =
2101 sbus_readb(esp
->eregs
+ ESP_FDATA
);
2102 ESPHME(("<%02x,0x00>", esp
->hme_fifo_workaround_buffer
[count
-1]));
2103 ESPHME(("CMD_FLUSH"));
2104 esp_cmd(esp
, ESP_CMD_FLUSH
);
2106 ESPHME(("no_xtra_byte"));
2109 ESPHME(("wkarnd_cnt=%d]", (int)count
));
2110 esp
->hme_fifo_workaround_count
= count
;
2113 static inline void hme_fifo_push(struct esp
*esp
, u8
*bytes
, u8 count
)
2115 esp_cmd(esp
, ESP_CMD_FLUSH
);
2118 sbus_writeb(tmp
, esp
->eregs
+ ESP_FDATA
);
2119 sbus_writeb(0, esp
->eregs
+ ESP_FDATA
);
2124 /* We try to avoid some interrupts by jumping ahead and see if the ESP
2125 * has gotten far enough yet. Hence the following.
2127 static inline int skipahead1(struct esp
*esp
, struct scsi_cmnd
*scp
,
2128 int prev_phase
, int new_phase
)
2130 if (scp
->SCp
.sent_command
!= prev_phase
)
2132 if (ESP_IRQ_P(esp
->dregs
)) {
2133 /* Yes, we are able to save an interrupt. */
2134 if (esp
->erev
== fashme
)
2135 esp
->sreg2
= sbus_readb(esp
->eregs
+ ESP_STATUS2
);
2136 esp
->sreg
= (sbus_readb(esp
->eregs
+ ESP_STATUS
) & ~(ESP_STAT_INTR
));
2137 esp
->ireg
= sbus_readb(esp
->eregs
+ ESP_INTRPT
);
2138 if (esp
->erev
== fashme
) {
2139 /* This chip is really losing. */
2141 /* Must latch fifo before reading the interrupt
2142 * register else garbage ends up in the FIFO
2143 * which confuses the driver utterly.
2144 * Happy Meal indeed....
2146 ESPHME(("fifo_workaround]"));
2147 if (!(esp
->sreg2
& ESP_STAT2_FEMPTY
) ||
2148 (esp
->sreg2
& ESP_STAT2_F1BYTE
))
2151 if (!(esp
->ireg
& ESP_INTR_SR
))
2154 return do_reset_complete
;
2156 /* Ho hum, target is taking forever... */
2157 scp
->SCp
.sent_command
= new_phase
; /* so we don't recurse... */
2161 static inline int skipahead2(struct esp
*esp
, struct scsi_cmnd
*scp
,
2162 int prev_phase1
, int prev_phase2
, int new_phase
)
2164 if (scp
->SCp
.sent_command
!= prev_phase1
&&
2165 scp
->SCp
.sent_command
!= prev_phase2
)
2167 if (ESP_IRQ_P(esp
->dregs
)) {
2168 /* Yes, we are able to save an interrupt. */
2169 if (esp
->erev
== fashme
)
2170 esp
->sreg2
= sbus_readb(esp
->eregs
+ ESP_STATUS2
);
2171 esp
->sreg
= (sbus_readb(esp
->eregs
+ ESP_STATUS
) & ~(ESP_STAT_INTR
));
2172 esp
->ireg
= sbus_readb(esp
->eregs
+ ESP_INTRPT
);
2173 if (esp
->erev
== fashme
) {
2174 /* This chip is really losing. */
2177 /* Must latch fifo before reading the interrupt
2178 * register else garbage ends up in the FIFO
2179 * which confuses the driver utterly.
2180 * Happy Meal indeed....
2182 ESPHME(("fifo_workaround]"));
2183 if (!(esp
->sreg2
& ESP_STAT2_FEMPTY
) ||
2184 (esp
->sreg2
& ESP_STAT2_F1BYTE
))
2187 if (!(esp
->ireg
& ESP_INTR_SR
))
2190 return do_reset_complete
;
2192 /* Ho hum, target is taking forever... */
2193 scp
->SCp
.sent_command
= new_phase
; /* so we don't recurse... */
2197 /* Now some dma helpers. */
2198 static void dma_setup(struct esp
*esp
, __u32 addr
, int count
, int write
)
2200 u32 nreg
= sbus_readl(esp
->dregs
+ DMA_CSR
);
2203 nreg
|= DMA_ST_WRITE
;
2205 nreg
&= ~(DMA_ST_WRITE
);
2207 sbus_writel(nreg
, esp
->dregs
+ DMA_CSR
);
2208 if (esp
->dma
->revision
== dvmaesc1
) {
2209 /* This ESC gate array sucks! */
2211 __u32 dest
= src
+ count
;
2213 if (dest
& (PAGE_SIZE
- 1))
2214 count
= PAGE_ALIGN(count
);
2215 sbus_writel(count
, esp
->dregs
+ DMA_COUNT
);
2217 sbus_writel(addr
, esp
->dregs
+ DMA_ADDR
);
2220 static void dma_drain(struct esp
*esp
)
2224 if (esp
->dma
->revision
== dvmahme
)
2226 if ((tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
)) & DMA_FIFO_ISDRAIN
) {
2227 switch (esp
->dma
->revision
) {
2229 tmp
|= DMA_FIFO_STDRAIN
;
2230 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
2234 while (sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_FIFO_ISDRAIN
)
2240 static void dma_invalidate(struct esp
*esp
)
2244 if (esp
->dma
->revision
== dvmahme
) {
2245 sbus_writel(DMA_RST_SCSI
, esp
->dregs
+ DMA_CSR
);
2247 esp
->prev_hme_dmacsr
= ((esp
->prev_hme_dmacsr
|
2248 (DMA_PARITY_OFF
| DMA_2CLKS
|
2249 DMA_SCSI_DISAB
| DMA_INT_ENAB
)) &
2250 ~(DMA_ST_WRITE
| DMA_ENABLE
));
2252 sbus_writel(0, esp
->dregs
+ DMA_CSR
);
2253 sbus_writel(esp
->prev_hme_dmacsr
, esp
->dregs
+ DMA_CSR
);
2255 /* This is necessary to avoid having the SCSI channel
2256 * engine lock up on us.
2258 sbus_writel(0, esp
->dregs
+ DMA_ADDR
);
2260 while ((tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
)) & DMA_PEND_READ
)
2263 tmp
&= ~(DMA_ENABLE
| DMA_ST_WRITE
| DMA_BCNT_ENAB
);
2264 tmp
|= DMA_FIFO_INV
;
2265 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
2266 tmp
&= ~DMA_FIFO_INV
;
2267 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
2271 static inline void dma_flashclear(struct esp
*esp
)
2274 dma_invalidate(esp
);
2277 static int dma_can_transfer(struct esp
*esp
, struct scsi_cmnd
*sp
)
2279 __u32 base
, end
, sz
;
2281 if (esp
->dma
->revision
== dvmarev3
) {
2282 sz
= sp
->SCp
.this_residual
;
2286 base
= ((__u32
)((unsigned long)sp
->SCp
.ptr
));
2287 base
&= (0x1000000 - 1);
2288 end
= (base
+ sp
->SCp
.this_residual
);
2289 if (end
> 0x1000000)
2296 /* Misc. esp helper macros. */
2297 #define esp_setcount(__eregs, __cnt, __hme) \
2298 sbus_writeb(((__cnt)&0xff), (__eregs) + ESP_TCLOW); \
2299 sbus_writeb((((__cnt)>>8)&0xff), (__eregs) + ESP_TCMED); \
2301 sbus_writeb((((__cnt)>>16)&0xff), (__eregs) + FAS_RLO); \
2302 sbus_writeb(0, (__eregs) + FAS_RHI); \
2305 #define esp_getcount(__eregs, __hme) \
2306 ((sbus_readb((__eregs) + ESP_TCLOW)&0xff) | \
2307 ((sbus_readb((__eregs) + ESP_TCMED)&0xff) << 8) | \
2308 ((__hme) ? sbus_readb((__eregs) + FAS_RLO) << 16 : 0))
2310 #define fcount(__esp) \
2311 (((__esp)->erev == fashme) ? \
2312 (__esp)->hme_fifo_workaround_count : \
2313 sbus_readb(((__esp)->eregs) + ESP_FFLAGS) & ESP_FF_FBYTES)
2315 #define fnzero(__esp) \
2316 (((__esp)->erev == fashme) ? 0 : \
2317 sbus_readb(((__esp)->eregs) + ESP_FFLAGS) & ESP_FF_ONOTZERO)
2319 /* XXX speculative nops unnecessary when continuing amidst a data phase
2320 * XXX even on esp100!!! another case of flooding the bus with I/O reg
2323 #define esp_maybe_nop(__esp) \
2324 if ((__esp)->erev == esp100) \
2325 esp_cmd((__esp), ESP_CMD_NULL)
2327 #define sreg_to_dataphase(__sreg) \
2328 ((((__sreg) & ESP_STAT_PMASK) == ESP_DOP) ? in_dataout : in_datain)
2330 /* The ESP100 when in synchronous data phase, can mistake a long final
2331 * REQ pulse from the target as an extra byte, it places whatever is on
2332 * the data lines into the fifo. For now, we will assume when this
2333 * happens that the target is a bit quirky and we don't want to
2334 * be talking synchronously to it anyways. Regardless, we need to
2335 * tell the ESP to eat the extraneous byte so that we can proceed
2336 * to the next phase.
2338 static int esp100_sync_hwbug(struct esp
*esp
, struct scsi_cmnd
*sp
, int fifocnt
)
2340 /* Do not touch this piece of code. */
2341 if ((!(esp
->erev
== esp100
)) ||
2342 (!(sreg_datainp((esp
->sreg
= sbus_readb(esp
->eregs
+ ESP_STATUS
))) &&
2344 !(sreg_dataoutp(esp
->sreg
) && !fnzero(esp
)))) {
2345 if (sp
->SCp
.phase
== in_dataout
)
2346 esp_cmd(esp
, ESP_CMD_FLUSH
);
2349 /* Async mode for this guy. */
2350 build_sync_nego_msg(esp
, 0, 0);
2352 /* Ack the bogus byte, but set ATN first. */
2353 esp_cmd(esp
, ESP_CMD_SATN
);
2354 esp_cmd(esp
, ESP_CMD_MOK
);
2359 /* This closes the window during a selection with a reselect pending, because
2360 * we use DMA for the selection process the FIFO should hold the correct
2361 * contents if we get reselected during this process. So we just need to
2362 * ack the possible illegal cmd interrupt pending on the esp100.
2364 static inline int esp100_reconnect_hwbug(struct esp
*esp
)
2368 if (esp
->erev
!= esp100
)
2370 tmp
= sbus_readb(esp
->eregs
+ ESP_INTRPT
);
2371 if (tmp
& ESP_INTR_SR
)
2376 /* This verifies the BUSID bits during a reselection so that we know which
2377 * target is talking to us.
2379 static inline int reconnect_target(struct esp
*esp
)
2381 int it
, me
= esp
->scsi_id_mask
, targ
= 0;
2383 if (2 != fcount(esp
))
2385 if (esp
->erev
== fashme
) {
2386 /* HME does not latch it's own BUS ID bits during
2387 * a reselection. Also the target number is given
2388 * as an unsigned char, not as a sole bit number
2389 * like the other ESP's do.
2390 * Happy Meal indeed....
2392 targ
= esp
->hme_fifo_workaround_buffer
[0];
2394 it
= sbus_readb(esp
->eregs
+ ESP_FDATA
);
2406 /* This verifies the identify from the target so that we know which lun is
2407 * being reconnected.
2409 static inline int reconnect_lun(struct esp
*esp
)
2413 if ((esp
->sreg
& ESP_STAT_PMASK
) != ESP_MIP
)
2415 if (esp
->erev
== fashme
)
2416 lun
= esp
->hme_fifo_workaround_buffer
[1];
2418 lun
= sbus_readb(esp
->eregs
+ ESP_FDATA
);
2420 /* Yes, you read this correctly. We report lun of zero
2421 * if we see parity error. ESP reports parity error for
2422 * the lun byte, and this is the only way to hope to recover
2423 * because the target is connected.
2425 if (esp
->sreg
& ESP_STAT_PERR
)
2428 /* Check for illegal bits being set in the lun. */
2429 if ((lun
& 0x40) || !(lun
& 0x80))
2435 /* This puts the driver in a state where it can revitalize a command that
2436 * is being continued due to reselection.
2438 static inline void esp_connect(struct esp
*esp
, struct scsi_cmnd
*sp
)
2440 struct esp_device
*esp_dev
= sp
->device
->hostdata
;
2442 if (esp
->prev_soff
!= esp_dev
->sync_max_offset
||
2443 esp
->prev_stp
!= esp_dev
->sync_min_period
||
2444 (esp
->erev
> esp100a
&&
2445 esp
->prev_cfg3
!= esp
->config3
[sp
->device
->id
])) {
2446 esp
->prev_soff
= esp_dev
->sync_max_offset
;
2447 esp
->prev_stp
= esp_dev
->sync_min_period
;
2448 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
2449 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
2450 if (esp
->erev
> esp100a
) {
2451 esp
->prev_cfg3
= esp
->config3
[sp
->device
->id
];
2452 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
2455 esp
->current_SC
= sp
;
2458 /* This will place the current working command back into the issue queue
2459 * if we are to receive a reselection amidst a selection attempt.
2461 static inline void esp_reconnect(struct esp
*esp
, struct scsi_cmnd
*sp
)
2463 if (!esp
->disconnected_SC
)
2464 ESPLOG(("esp%d: Weird, being reselected but disconnected "
2465 "command queue is empty.\n", esp
->esp_id
));
2467 esp
->current_SC
= NULL
;
2468 sp
->SCp
.phase
= not_issued
;
2469 append_SC(&esp
->issue_SC
, sp
);
2472 /* Begin message in phase. */
2473 static int esp_do_msgin(struct esp
*esp
)
2475 /* Must be very careful with the fifo on the HME */
2476 if ((esp
->erev
!= fashme
) ||
2477 !(sbus_readb(esp
->eregs
+ ESP_STATUS2
) & ESP_STAT2_FEMPTY
))
2478 esp_cmd(esp
, ESP_CMD_FLUSH
);
2480 esp_cmd(esp
, ESP_CMD_TI
);
2483 esp_advance_phase(esp
->current_SC
, in_msgindone
);
2487 /* This uses various DMA csr fields and the fifo flags count value to
2488 * determine how many bytes were successfully sent/received by the ESP.
2490 static inline int esp_bytes_sent(struct esp
*esp
, int fifo_count
)
2492 int rval
= sbus_readl(esp
->dregs
+ DMA_ADDR
) - esp
->esp_command_dvma
;
2494 if (esp
->dma
->revision
== dvmarev1
)
2495 rval
-= (4 - ((sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_READ_AHEAD
)>>11));
2496 return rval
- fifo_count
;
2499 static inline void advance_sg(struct scsi_cmnd
*sp
)
2502 --sp
->SCp
.buffers_residual
;
2503 sp
->SCp
.this_residual
= sg_dma_len(sp
->SCp
.buffer
);
2504 sp
->SCp
.ptr
= (char *)((unsigned long)sg_dma_address(sp
->SCp
.buffer
));
2507 /* Please note that the way I've coded these routines is that I _always_
2508 * check for a disconnect during any and all information transfer
2509 * phases. The SCSI standard states that the target _can_ cause a BUS
2510 * FREE condition by dropping all MSG/CD/IO/BSY signals. Also note
2511 * that during information transfer phases the target controls every
2512 * change in phase, the only thing the initiator can do is "ask" for
2513 * a message out phase by driving ATN true. The target can, and sometimes
2514 * will, completely ignore this request so we cannot assume anything when
2515 * we try to force a message out phase to abort/reset a target. Most of
2516 * the time the target will eventually be nice and go to message out, so
2517 * we may have to hold on to our state about what we want to tell the target
2518 * for some period of time.
2521 /* I think I have things working here correctly. Even partial transfers
2522 * within a buffer or sub-buffer should not upset us at all no matter
2523 * how bad the target and/or ESP fucks things up.
2525 static int esp_do_data(struct esp
*esp
)
2527 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
2528 int thisphase
, hmuch
;
2530 ESPDATA(("esp_do_data: "));
2532 thisphase
= sreg_to_dataphase(esp
->sreg
);
2533 esp_advance_phase(SCptr
, thisphase
);
2534 ESPDATA(("newphase<%s> ", (thisphase
== in_datain
) ? "DATAIN" : "DATAOUT"));
2535 hmuch
= dma_can_transfer(esp
, SCptr
);
2536 if (hmuch
> (64 * 1024) && (esp
->erev
!= fashme
))
2537 hmuch
= (64 * 1024);
2538 ESPDATA(("hmuch<%d> ", hmuch
));
2539 esp
->current_transfer_size
= hmuch
;
2541 if (esp
->erev
== fashme
) {
2542 u32 tmp
= esp
->prev_hme_dmacsr
;
2544 /* Always set the ESP count registers first. */
2545 esp_setcount(esp
->eregs
, hmuch
, 1);
2547 /* Get the DMA csr computed. */
2548 tmp
|= (DMA_SCSI_DISAB
| DMA_ENABLE
);
2549 if (thisphase
== in_datain
)
2550 tmp
|= DMA_ST_WRITE
;
2552 tmp
&= ~(DMA_ST_WRITE
);
2553 esp
->prev_hme_dmacsr
= tmp
;
2555 ESPDATA(("DMA|TI --> do_intr_end\n"));
2556 if (thisphase
== in_datain
) {
2557 sbus_writel(hmuch
, esp
->dregs
+ DMA_COUNT
);
2558 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
2560 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
2561 sbus_writel(hmuch
, esp
->dregs
+ DMA_COUNT
);
2563 sbus_writel((__u32
)((unsigned long)SCptr
->SCp
.ptr
), esp
->dregs
+DMA_ADDR
);
2564 sbus_writel(esp
->prev_hme_dmacsr
, esp
->dregs
+ DMA_CSR
);
2566 esp_setcount(esp
->eregs
, hmuch
, 0);
2567 dma_setup(esp
, ((__u32
)((unsigned long)SCptr
->SCp
.ptr
)),
2568 hmuch
, (thisphase
== in_datain
));
2569 ESPDATA(("DMA|TI --> do_intr_end\n"));
2570 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
2575 /* See how successful the data transfer was. */
2576 static int esp_do_data_finale(struct esp
*esp
)
2578 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
2579 struct esp_device
*esp_dev
= SCptr
->device
->hostdata
;
2580 int bogus_data
= 0, bytes_sent
= 0, fifocnt
, ecount
= 0;
2582 ESPDATA(("esp_do_data_finale: "));
2584 if (SCptr
->SCp
.phase
== in_datain
) {
2585 if (esp
->sreg
& ESP_STAT_PERR
) {
2586 /* Yuck, parity error. The ESP asserts ATN
2587 * so that we can go to message out phase
2588 * immediately and inform the target that
2589 * something bad happened.
2591 ESPLOG(("esp%d: data bad parity detected.\n",
2593 esp
->cur_msgout
[0] = INITIATOR_ERROR
;
2594 esp
->msgout_len
= 1;
2598 dma_invalidate(esp
);
2600 /* This could happen for the above parity error case. */
2601 if (esp
->ireg
!= ESP_INTR_BSERV
) {
2602 /* Please go to msgout phase, please please please... */
2603 ESPLOG(("esp%d: !BSERV after data, probably to msgout\n",
2605 return esp_do_phase_determine(esp
);
2608 /* Check for partial transfers and other horrible events.
2609 * Note, here we read the real fifo flags register even
2610 * on HME broken adapters because we skip the HME fifo
2611 * workaround code in esp_handle() if we are doing data
2612 * phase things. We don't want to fuck directly with
2613 * the fifo like that, especially if doing synchronous
2614 * transfers! Also, will need to double the count on
2615 * HME if we are doing wide transfers, as the HME fifo
2616 * will move and count 16-bit quantities during wide data.
2617 * SMCC _and_ Qlogic can both bite me.
2619 fifocnt
= (sbus_readb(esp
->eregs
+ ESP_FFLAGS
) & ESP_FF_FBYTES
);
2620 if (esp
->erev
!= fashme
)
2621 ecount
= esp_getcount(esp
->eregs
, 0);
2622 bytes_sent
= esp
->current_transfer_size
;
2624 ESPDATA(("trans_sz(%d), ", bytes_sent
));
2625 if (esp
->erev
== fashme
) {
2626 if (!(esp
->sreg
& ESP_STAT_TCNT
)) {
2627 ecount
= esp_getcount(esp
->eregs
, 1);
2628 bytes_sent
-= ecount
;
2631 /* Always subtract any cruft remaining in the FIFO. */
2632 if (esp
->prev_cfg3
& ESP_CONFIG3_EWIDE
)
2634 if (SCptr
->SCp
.phase
== in_dataout
)
2635 bytes_sent
-= fifocnt
;
2637 /* I have an IBM disk which exhibits the following
2638 * behavior during writes to it. It disconnects in
2639 * the middle of a partial transfer, the current sglist
2640 * buffer is 1024 bytes, the disk stops data transfer
2643 * However the FAS366 reports that 32 more bytes were
2644 * transferred than really were. This is precisely
2645 * the size of a fully loaded FIFO in wide scsi mode.
2646 * The FIFO state recorded indicates that it is empty.
2648 * I have no idea if this is a bug in the FAS366 chip
2649 * or a bug in the firmware on this IBM disk. In any
2650 * event the following seems to be a good workaround. -DaveM
2652 if (bytes_sent
!= esp
->current_transfer_size
&&
2653 SCptr
->SCp
.phase
== in_dataout
) {
2654 int mask
= (64 - 1);
2656 if ((esp
->prev_cfg3
& ESP_CONFIG3_EWIDE
) == 0)
2659 if (bytes_sent
& mask
)
2660 bytes_sent
-= (bytes_sent
& mask
);
2663 if (!(esp
->sreg
& ESP_STAT_TCNT
))
2664 bytes_sent
-= ecount
;
2665 if (SCptr
->SCp
.phase
== in_dataout
)
2666 bytes_sent
-= fifocnt
;
2669 ESPDATA(("bytes_sent(%d), ", bytes_sent
));
2671 /* If we were in synchronous mode, check for peculiarities. */
2672 if (esp
->erev
== fashme
) {
2673 if (esp_dev
->sync_max_offset
) {
2674 if (SCptr
->SCp
.phase
== in_dataout
)
2675 esp_cmd(esp
, ESP_CMD_FLUSH
);
2677 esp_cmd(esp
, ESP_CMD_FLUSH
);
2680 if (esp_dev
->sync_max_offset
)
2681 bogus_data
= esp100_sync_hwbug(esp
, SCptr
, fifocnt
);
2683 esp_cmd(esp
, ESP_CMD_FLUSH
);
2686 /* Until we are sure of what has happened, we are certainly
2689 esp_advance_phase(SCptr
, in_the_dark
);
2691 if (bytes_sent
< 0) {
2692 /* I've seen this happen due to lost state in this
2693 * driver. No idea why it happened, but allowing
2694 * this value to be negative caused things to
2695 * lock up. This allows greater chance of recovery.
2696 * In fact every time I've seen this, it has been
2697 * a driver bug without question.
2699 ESPLOG(("esp%d: yieee, bytes_sent < 0!\n", esp
->esp_id
));
2700 ESPLOG(("esp%d: csz=%d fifocount=%d ecount=%d\n",
2702 esp
->current_transfer_size
, fifocnt
, ecount
));
2703 ESPLOG(("esp%d: use_sg=%d ptr=%p this_residual=%d\n",
2705 SCptr
->use_sg
, SCptr
->SCp
.ptr
, SCptr
->SCp
.this_residual
));
2706 ESPLOG(("esp%d: Forcing async for target %d\n", esp
->esp_id
,
2707 SCptr
->device
->id
));
2708 SCptr
->device
->borken
= 1;
2713 /* Update the state of our transfer. */
2714 SCptr
->SCp
.ptr
+= bytes_sent
;
2715 SCptr
->SCp
.this_residual
-= bytes_sent
;
2716 if (SCptr
->SCp
.this_residual
< 0) {
2718 ESPLOG(("esp%d: Data transfer overrun.\n", esp
->esp_id
));
2719 SCptr
->SCp
.this_residual
= 0;
2722 /* Maybe continue. */
2724 ESPDATA(("!bogus_data, "));
2726 /* NO MATTER WHAT, we advance the scatterlist,
2727 * if the target should decide to disconnect
2728 * in between scatter chunks (which is common)
2729 * we could die horribly! I used to have the sg
2730 * advance occur only if we are going back into
2731 * (or are staying in) a data phase, you can
2732 * imagine the hell I went through trying to
2735 if (SCptr
->use_sg
&& !SCptr
->SCp
.this_residual
)
2737 if (sreg_datainp(esp
->sreg
) || sreg_dataoutp(esp
->sreg
)) {
2738 ESPDATA(("to more data\n"));
2739 return esp_do_data(esp
);
2741 ESPDATA(("to new phase\n"));
2742 return esp_do_phase_determine(esp
);
2744 /* Bogus data, just wait for next interrupt. */
2745 ESPLOG(("esp%d: bogus_data during end of data phase\n",
2750 /* We received a non-good status return at the end of
2751 * running a SCSI command. This is used to decide if
2752 * we should clear our synchronous transfer state for
2753 * such a device when that happens.
2755 * The idea is that when spinning up a disk or rewinding
2756 * a tape, we don't want to go into a loop re-negotiating
2757 * synchronous capabilities over and over.
2759 static int esp_should_clear_sync(struct scsi_cmnd
*sp
)
2761 u8 cmd1
= sp
->cmnd
[0];
2762 u8 cmd2
= sp
->data_cmnd
[0];
2764 /* These cases are for spinning up a disk and
2765 * waiting for that spinup to complete.
2767 if (cmd1
== START_STOP
||
2771 if (cmd1
== TEST_UNIT_READY
||
2772 cmd2
== TEST_UNIT_READY
)
2775 /* One more special case for SCSI tape drives,
2776 * this is what is used to probe the device for
2777 * completion of a rewind or tape load operation.
2779 if (sp
->device
->type
== TYPE_TAPE
) {
2780 if (cmd1
== MODE_SENSE
||
2788 /* Either a command is completing or a target is dropping off the bus
2789 * to continue the command in the background so we can do other work.
2791 static int esp_do_freebus(struct esp
*esp
)
2793 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
2794 struct esp_device
*esp_dev
= SCptr
->device
->hostdata
;
2797 rval
= skipahead2(esp
, SCptr
, in_status
, in_msgindone
, in_freeing
);
2800 if (esp
->ireg
!= ESP_INTR_DC
) {
2801 ESPLOG(("esp%d: Target will not disconnect\n", esp
->esp_id
));
2802 return do_reset_bus
; /* target will not drop BSY... */
2804 esp
->msgout_len
= 0;
2805 esp
->prevmsgout
= NOP
;
2806 if (esp
->prevmsgin
== COMMAND_COMPLETE
) {
2807 /* Normal end of nexus. */
2808 if (esp
->disconnected_SC
|| (esp
->erev
== fashme
))
2809 esp_cmd(esp
, ESP_CMD_ESEL
);
2811 if (SCptr
->SCp
.Status
!= GOOD
&&
2812 SCptr
->SCp
.Status
!= CONDITION_GOOD
&&
2813 ((1<<SCptr
->device
->id
) & esp
->targets_present
) &&
2815 esp_dev
->sync_max_offset
) {
2816 /* SCSI standard says that the synchronous capabilities
2817 * should be renegotiated at this point. Most likely
2818 * we are about to request sense from this target
2819 * in which case we want to avoid using sync
2820 * transfers until we are sure of the current target
2823 ESPMISC(("esp: Status <%d> for target %d lun %d\n",
2824 SCptr
->SCp
.Status
, SCptr
->device
->id
, SCptr
->device
->lun
));
2826 /* But don't do this when spinning up a disk at
2827 * boot time while we poll for completion as it
2828 * fills up the console with messages. Also, tapes
2829 * can report not ready many times right after
2830 * loading up a tape.
2832 if (esp_should_clear_sync(SCptr
) != 0)
2835 ESPDISC(("F<%02x,%02x>", SCptr
->device
->id
, SCptr
->device
->lun
));
2836 esp_done(esp
, ((SCptr
->SCp
.Status
& 0xff) |
2837 ((SCptr
->SCp
.Message
& 0xff)<<8) |
2839 } else if (esp
->prevmsgin
== DISCONNECT
) {
2840 /* Normal disconnect. */
2841 esp_cmd(esp
, ESP_CMD_ESEL
);
2842 ESPDISC(("D<%02x,%02x>", SCptr
->device
->id
, SCptr
->device
->lun
));
2843 append_SC(&esp
->disconnected_SC
, SCptr
);
2844 esp
->current_SC
= NULL
;
2848 /* Driver bug, we do not expect a disconnect here
2849 * and should not have advanced the state engine
2852 ESPLOG(("esp%d: last msg not disc and not cmd cmplt.\n",
2854 return do_reset_bus
;
2859 /* When a reselect occurs, and we cannot find the command to
2860 * reconnect to in our queues, we do this.
2862 static int esp_bad_reconnect(struct esp
*esp
)
2864 struct scsi_cmnd
*sp
;
2866 ESPLOG(("esp%d: Eieeee, reconnecting unknown command!\n",
2868 ESPLOG(("QUEUE DUMP\n"));
2870 ESPLOG(("esp%d: issue_SC[", esp
->esp_id
));
2872 ESPLOG(("<%02x,%02x>", sp
->device
->id
, sp
->device
->lun
));
2873 sp
= (struct scsi_cmnd
*) sp
->host_scribble
;
2876 sp
= esp
->current_SC
;
2877 ESPLOG(("esp%d: current_SC[", esp
->esp_id
));
2879 ESPLOG(("<%02x,%02x>", sp
->device
->id
, sp
->device
->lun
));
2883 sp
= esp
->disconnected_SC
;
2884 ESPLOG(("esp%d: disconnected_SC[", esp
->esp_id
));
2886 ESPLOG(("<%02x,%02x>", sp
->device
->id
, sp
->device
->lun
));
2887 sp
= (struct scsi_cmnd
*) sp
->host_scribble
;
2890 return do_reset_bus
;
2893 /* Do the needy when a target tries to reconnect to us. */
2894 static int esp_do_reconnect(struct esp
*esp
)
2897 struct scsi_cmnd
*SCptr
;
2899 /* Check for all bogus conditions first. */
2900 target
= reconnect_target(esp
);
2902 ESPDISC(("bad bus bits\n"));
2903 return do_reset_bus
;
2905 lun
= reconnect_lun(esp
);
2907 ESPDISC(("target=%2x, bad identify msg\n", target
));
2908 return do_reset_bus
;
2911 /* Things look ok... */
2912 ESPDISC(("R<%02x,%02x>", target
, lun
));
2914 /* Must not flush FIFO or DVMA on HME. */
2915 if (esp
->erev
!= fashme
) {
2916 esp_cmd(esp
, ESP_CMD_FLUSH
);
2917 if (esp100_reconnect_hwbug(esp
))
2918 return do_reset_bus
;
2919 esp_cmd(esp
, ESP_CMD_NULL
);
2922 SCptr
= remove_SC(&esp
->disconnected_SC
, (u8
) target
, (u8
) lun
);
2924 return esp_bad_reconnect(esp
);
2926 esp_connect(esp
, SCptr
);
2927 esp_cmd(esp
, ESP_CMD_MOK
);
2929 if (esp
->erev
== fashme
)
2930 sbus_writeb(((SCptr
->device
->id
& 0xf) |
2931 (ESP_BUSID_RESELID
| ESP_BUSID_CTR32BIT
)),
2932 esp
->eregs
+ ESP_BUSID
);
2934 /* Reconnect implies a restore pointers operation. */
2935 esp_restore_pointers(esp
, SCptr
);
2938 esp_advance_phase(SCptr
, in_the_dark
);
2942 /* End of NEXUS (hopefully), pick up status + message byte then leave if
2945 static int esp_do_status(struct esp
*esp
)
2947 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
2950 rval
= skipahead1(esp
, SCptr
, in_the_dark
, in_status
);
2954 ESPSTAT(("esp_do_status: "));
2955 if (intr
!= ESP_INTR_DC
) {
2956 int message_out
= 0; /* for parity problems */
2958 /* Ack the message. */
2959 ESPSTAT(("ack msg, "));
2960 esp_cmd(esp
, ESP_CMD_MOK
);
2962 if (esp
->erev
!= fashme
) {
2963 dma_flashclear(esp
);
2965 /* Wait till the first bits settle. */
2966 while (esp
->esp_command
[0] == 0xff)
2969 esp
->esp_command
[0] = esp
->hme_fifo_workaround_buffer
[0];
2970 esp
->esp_command
[1] = esp
->hme_fifo_workaround_buffer
[1];
2973 ESPSTAT(("got something, "));
2974 /* ESP chimes in with one of
2976 * 1) function done interrupt:
2977 * both status and message in bytes
2980 * 2) bus service interrupt:
2981 * only status byte was acquired
2984 * can't happen, but we test for it
2987 * ALSO: If bad parity was detected on either
2988 * the status _or_ the message byte then
2989 * the ESP has asserted ATN on the bus
2990 * and we must therefore wait for the
2991 * next phase change.
2993 if (intr
& ESP_INTR_FDONE
) {
2994 /* We got it all, hallejulia. */
2995 ESPSTAT(("got both, "));
2996 SCptr
->SCp
.Status
= esp
->esp_command
[0];
2997 SCptr
->SCp
.Message
= esp
->esp_command
[1];
2998 esp
->prevmsgin
= SCptr
->SCp
.Message
;
2999 esp
->cur_msgin
[0] = SCptr
->SCp
.Message
;
3000 if (esp
->sreg
& ESP_STAT_PERR
) {
3001 /* There was bad parity for the
3002 * message byte, the status byte
3005 message_out
= MSG_PARITY_ERROR
;
3007 } else if (intr
== ESP_INTR_BSERV
) {
3008 /* Only got status byte. */
3009 ESPLOG(("esp%d: got status only, ", esp
->esp_id
));
3010 if (!(esp
->sreg
& ESP_STAT_PERR
)) {
3011 SCptr
->SCp
.Status
= esp
->esp_command
[0];
3012 SCptr
->SCp
.Message
= 0xff;
3014 /* The status byte had bad parity.
3015 * we leave the scsi_pointer Status
3016 * field alone as we set it to a default
3017 * of CHECK_CONDITION in esp_queue.
3019 message_out
= INITIATOR_ERROR
;
3022 /* This shouldn't happen ever. */
3023 ESPSTAT(("got bolixed\n"));
3024 esp_advance_phase(SCptr
, in_the_dark
);
3025 return esp_do_phase_determine(esp
);
3029 ESPSTAT(("status=%2x msg=%2x, ", SCptr
->SCp
.Status
,
3030 SCptr
->SCp
.Message
));
3031 if (SCptr
->SCp
.Message
== COMMAND_COMPLETE
) {
3032 ESPSTAT(("and was COMMAND_COMPLETE\n"));
3033 esp_advance_phase(SCptr
, in_freeing
);
3034 return esp_do_freebus(esp
);
3036 ESPLOG(("esp%d: and _not_ COMMAND_COMPLETE\n",
3038 esp
->msgin_len
= esp
->msgin_ctr
= 1;
3039 esp_advance_phase(SCptr
, in_msgindone
);
3040 return esp_do_msgindone(esp
);
3043 /* With luck we'll be able to let the target
3044 * know that bad parity happened, it will know
3045 * which byte caused the problems and send it
3046 * again. For the case where the status byte
3047 * receives bad parity, I do not believe most
3048 * targets recover very well. We'll see.
3050 ESPLOG(("esp%d: bad parity somewhere mout=%2x\n",
3051 esp
->esp_id
, message_out
));
3052 esp
->cur_msgout
[0] = message_out
;
3053 esp
->msgout_len
= esp
->msgout_ctr
= 1;
3054 esp_advance_phase(SCptr
, in_the_dark
);
3055 return esp_do_phase_determine(esp
);
3058 /* If we disconnect now, all hell breaks loose. */
3059 ESPLOG(("esp%d: whoops, disconnect\n", esp
->esp_id
));
3060 esp_advance_phase(SCptr
, in_the_dark
);
3061 return esp_do_phase_determine(esp
);
3065 static int esp_enter_status(struct esp
*esp
)
3067 u8 thecmd
= ESP_CMD_ICCSEQ
;
3069 esp_cmd(esp
, ESP_CMD_FLUSH
);
3070 if (esp
->erev
!= fashme
) {
3073 esp
->esp_command
[0] = esp
->esp_command
[1] = 0xff;
3074 sbus_writeb(2, esp
->eregs
+ ESP_TCLOW
);
3075 sbus_writeb(0, esp
->eregs
+ ESP_TCMED
);
3076 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
3077 tmp
|= (DMA_ST_WRITE
| DMA_ENABLE
);
3078 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
3079 if (esp
->dma
->revision
== dvmaesc1
)
3080 sbus_writel(0x100, esp
->dregs
+ DMA_COUNT
);
3081 sbus_writel(esp
->esp_command_dvma
, esp
->dregs
+ DMA_ADDR
);
3082 thecmd
|= ESP_CMD_DMA
;
3084 esp_cmd(esp
, thecmd
);
3085 esp_advance_phase(esp
->current_SC
, in_status
);
3087 return esp_do_status(esp
);
3090 static int esp_disconnect_amidst_phases(struct esp
*esp
)
3092 struct scsi_cmnd
*sp
= esp
->current_SC
;
3093 struct esp_device
*esp_dev
= sp
->device
->hostdata
;
3095 /* This means real problems if we see this
3096 * here. Unless we were actually trying
3097 * to force the device to abort/reset.
3099 ESPLOG(("esp%d Disconnect amidst phases, ", esp
->esp_id
));
3100 ESPLOG(("pphase<%s> cphase<%s>, ",
3101 phase_string(sp
->SCp
.phase
),
3102 phase_string(sp
->SCp
.sent_command
)));
3104 if (esp
->disconnected_SC
!= NULL
|| (esp
->erev
== fashme
))
3105 esp_cmd(esp
, ESP_CMD_ESEL
);
3107 switch (esp
->cur_msgout
[0]) {
3109 /* We didn't expect this to happen at all. */
3110 ESPLOG(("device is bolixed\n"));
3111 esp_advance_phase(sp
, in_tgterror
);
3112 esp_done(esp
, (DID_ERROR
<< 16));
3115 case BUS_DEVICE_RESET
:
3116 ESPLOG(("device reset successful\n"));
3117 esp_dev
->sync_max_offset
= 0;
3118 esp_dev
->sync_min_period
= 0;
3120 esp_advance_phase(sp
, in_resetdev
);
3121 esp_done(esp
, (DID_RESET
<< 16));
3125 ESPLOG(("device abort successful\n"));
3126 esp_advance_phase(sp
, in_abortone
);
3127 esp_done(esp
, (DID_ABORT
<< 16));
3134 static int esp_enter_msgout(struct esp
*esp
)
3136 esp_advance_phase(esp
->current_SC
, in_msgout
);
3137 return esp_do_msgout(esp
);
3140 static int esp_enter_msgin(struct esp
*esp
)
3142 esp_advance_phase(esp
->current_SC
, in_msgin
);
3143 return esp_do_msgin(esp
);
3146 static int esp_enter_cmd(struct esp
*esp
)
3148 esp_advance_phase(esp
->current_SC
, in_cmdbegin
);
3149 return esp_do_cmdbegin(esp
);
3152 static int esp_enter_badphase(struct esp
*esp
)
3154 ESPLOG(("esp%d: Bizarre bus phase %2x.\n", esp
->esp_id
,
3155 esp
->sreg
& ESP_STAT_PMASK
));
3156 return do_reset_bus
;
3159 typedef int (*espfunc_t
)(struct esp
*);
3161 static espfunc_t phase_vector
[] = {
3162 esp_do_data
, /* ESP_DOP */
3163 esp_do_data
, /* ESP_DIP */
3164 esp_enter_cmd
, /* ESP_CMDP */
3165 esp_enter_status
, /* ESP_STATP */
3166 esp_enter_badphase
, /* ESP_STAT_PMSG */
3167 esp_enter_badphase
, /* ESP_STAT_PMSG | ESP_STAT_PIO */
3168 esp_enter_msgout
, /* ESP_MOP */
3169 esp_enter_msgin
, /* ESP_MIP */
3172 /* The target has control of the bus and we have to see where it has
3175 static int esp_do_phase_determine(struct esp
*esp
)
3177 if ((esp
->ireg
& ESP_INTR_DC
) != 0)
3178 return esp_disconnect_amidst_phases(esp
);
3179 return phase_vector
[esp
->sreg
& ESP_STAT_PMASK
](esp
);
3182 /* First interrupt after exec'ing a cmd comes here. */
3183 static int esp_select_complete(struct esp
*esp
)
3185 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
3186 struct esp_device
*esp_dev
= SCptr
->device
->hostdata
;
3187 int cmd_bytes_sent
, fcnt
;
3189 if (esp
->erev
!= fashme
)
3190 esp
->seqreg
= (sbus_readb(esp
->eregs
+ ESP_SSTEP
) & ESP_STEP_VBITS
);
3192 if (esp
->erev
== fashme
)
3193 fcnt
= esp
->hme_fifo_workaround_count
;
3195 fcnt
= (sbus_readb(esp
->eregs
+ ESP_FFLAGS
) & ESP_FF_FBYTES
);
3197 cmd_bytes_sent
= esp_bytes_sent(esp
, fcnt
);
3198 dma_invalidate(esp
);
3200 /* Let's check to see if a reselect happened
3201 * while we we're trying to select. This must
3204 if (esp
->ireg
== (ESP_INTR_RSEL
| ESP_INTR_FDONE
)) {
3205 esp_reconnect(esp
, SCptr
);
3206 return esp_do_reconnect(esp
);
3209 /* Looks like things worked, we should see a bus service &
3210 * a function complete interrupt at this point. Note we
3211 * are doing a direct comparison because we don't want to
3212 * be fooled into thinking selection was successful if
3213 * ESP_INTR_DC is set, see below.
3215 if (esp
->ireg
== (ESP_INTR_FDONE
| ESP_INTR_BSERV
)) {
3216 /* target speaks... */
3217 esp
->targets_present
|= (1<<SCptr
->device
->id
);
3219 /* What if the target ignores the sdtr? */
3223 /* See how far, if at all, we got in getting
3224 * the information out to the target.
3226 switch (esp
->seqreg
) {
3230 /* Arbitration won, target selected, but
3231 * we are in some phase which is not command
3232 * phase nor is it message out phase.
3234 * XXX We've confused the target, obviously.
3235 * XXX So clear it's state, but we also end
3236 * XXX up clearing everyone elses. That isn't
3237 * XXX so nice. I'd like to just reset this
3238 * XXX target, but if I cannot even get it's
3239 * XXX attention and finish selection to talk
3240 * XXX to it, there is not much more I can do.
3241 * XXX If we have a loaded bus we're going to
3242 * XXX spend the next second or so renegotiating
3243 * XXX for synchronous transfers.
3245 ESPLOG(("esp%d: STEP_ASEL for tgt %d\n",
3246 esp
->esp_id
, SCptr
->device
->id
));
3249 /* Arbitration won, target selected, went
3250 * to message out phase, sent one message
3251 * byte, then we stopped. ATN is asserted
3252 * on the SCSI bus and the target is still
3253 * there hanging on. This is a legal
3254 * sequence step if we gave the ESP a select
3257 * XXX See above, I could set the borken flag
3258 * XXX in the device struct and retry the
3259 * XXX command. But would that help for
3260 * XXX tagged capable targets?
3264 /* Arbitration won, target selected, maybe
3265 * sent the one message byte in message out
3266 * phase, but we did not go to command phase
3267 * in the end. Actually, we could have sent
3268 * only some of the message bytes if we tried
3269 * to send out the entire identify and tag
3270 * message using ESP_CMD_SA3.
3276 /* No, not the powerPC pinhead. Arbitration
3277 * won, all message bytes sent if we went to
3278 * message out phase, went to command phase
3279 * but only part of the command was sent.
3281 * XXX I've seen this, but usually in conjunction
3282 * XXX with a gross error which appears to have
3283 * XXX occurred between the time I told the
3284 * XXX ESP to arbitrate and when I got the
3285 * XXX interrupt. Could I have misloaded the
3286 * XXX command bytes into the fifo? Actually,
3287 * XXX I most likely missed a phase, and therefore
3288 * XXX went into never never land and didn't even
3289 * XXX know it. That was the old driver though.
3290 * XXX What is even more peculiar is that the ESP
3291 * XXX showed the proper function complete and
3292 * XXX bus service bits in the interrupt register.
3295 case ESP_STEP_FINI4
:
3296 case ESP_STEP_FINI5
:
3297 case ESP_STEP_FINI6
:
3298 case ESP_STEP_FINI7
:
3299 /* Account for the identify message */
3300 if (SCptr
->SCp
.phase
== in_slct_norm
)
3301 cmd_bytes_sent
-= 1;
3304 if (esp
->erev
!= fashme
)
3305 esp_cmd(esp
, ESP_CMD_NULL
);
3307 /* Be careful, we could really get fucked during synchronous
3308 * data transfers if we try to flush the fifo now.
3310 if ((esp
->erev
!= fashme
) && /* not a Happy Meal and... */
3311 !fcnt
&& /* Fifo is empty and... */
3312 /* either we are not doing synchronous transfers or... */
3313 (!esp_dev
->sync_max_offset
||
3314 /* We are not going into data in phase. */
3315 ((esp
->sreg
& ESP_STAT_PMASK
) != ESP_DIP
)))
3316 esp_cmd(esp
, ESP_CMD_FLUSH
); /* flush is safe */
3318 /* See how far we got if this is not a slow command. */
3319 if (!esp
->esp_slowcmd
) {
3320 if (cmd_bytes_sent
< 0)
3322 if (cmd_bytes_sent
!= SCptr
->cmd_len
) {
3323 /* Crapola, mark it as a slowcmd
3324 * so that we have some chance of
3325 * keeping the command alive with
3328 * XXX Actually, if we didn't send it all
3329 * XXX this means either we didn't set things
3330 * XXX up properly (driver bug) or the target
3331 * XXX or the ESP detected parity on one of
3332 * XXX the command bytes. This makes much
3333 * XXX more sense, and therefore this code
3334 * XXX should be changed to send out a
3335 * XXX parity error message or if the status
3336 * XXX register shows no parity error then
3337 * XXX just expect the target to bring the
3338 * XXX bus into message in phase so that it
3339 * XXX can send us the parity error message.
3342 esp
->esp_slowcmd
= 1;
3343 esp
->esp_scmdp
= &(SCptr
->cmnd
[cmd_bytes_sent
]);
3344 esp
->esp_scmdleft
= (SCptr
->cmd_len
- cmd_bytes_sent
);
3348 /* Now figure out where we went. */
3349 esp_advance_phase(SCptr
, in_the_dark
);
3350 return esp_do_phase_determine(esp
);
3353 /* Did the target even make it? */
3354 if (esp
->ireg
== ESP_INTR_DC
) {
3355 /* wheee... nobody there or they didn't like
3356 * what we told it to do, clean up.
3359 /* If anyone is off the bus, but working on
3360 * a command in the background for us, tell
3361 * the ESP to listen for them.
3363 if (esp
->disconnected_SC
)
3364 esp_cmd(esp
, ESP_CMD_ESEL
);
3366 if (((1<<SCptr
->device
->id
) & esp
->targets_present
) &&
3368 (esp
->cur_msgout
[0] == EXTENDED_MESSAGE
) &&
3369 (SCptr
->SCp
.phase
== in_slct_msg
||
3370 SCptr
->SCp
.phase
== in_slct_stop
)) {
3373 ESPLOG(("esp%d: Failed synchronous negotiation for target %d "
3374 "lun %d\n", esp
->esp_id
, SCptr
->device
->id
, SCptr
->device
->lun
));
3375 esp_dev
->sync_max_offset
= 0;
3376 esp_dev
->sync_min_period
= 0;
3377 esp_dev
->sync
= 1; /* so we don't negotiate again */
3379 /* Run the command again, this time though we
3380 * won't try to negotiate for synchronous transfers.
3382 * XXX I'd like to do something like send an
3383 * XXX INITIATOR_ERROR or ABORT message to the
3384 * XXX target to tell it, "Sorry I confused you,
3385 * XXX please come back and I will be nicer next
3386 * XXX time". But that requires having the target
3387 * XXX on the bus, and it has dropped BSY on us.
3389 esp
->current_SC
= NULL
;
3390 esp_advance_phase(SCptr
, not_issued
);
3391 prepend_SC(&esp
->issue_SC
, SCptr
);
3396 /* Ok, this is normal, this is what we see during boot
3397 * or whenever when we are scanning the bus for targets.
3398 * But first make sure that is really what is happening.
3400 if (((1<<SCptr
->device
->id
) & esp
->targets_present
)) {
3401 ESPLOG(("esp%d: Warning, live target %d not responding to "
3402 "selection.\n", esp
->esp_id
, SCptr
->device
->id
));
3404 /* This _CAN_ happen. The SCSI standard states that
3405 * the target is to _not_ respond to selection if
3406 * _it_ detects bad parity on the bus for any reason.
3407 * Therefore, we assume that if we've talked successfully
3408 * to this target before, bad parity is the problem.
3410 esp_done(esp
, (DID_PARITY
<< 16));
3412 /* Else, there really isn't anyone there. */
3413 ESPMISC(("esp: selection failure, maybe nobody there?\n"));
3414 ESPMISC(("esp: target %d lun %d\n",
3415 SCptr
->device
->id
, SCptr
->device
->lun
));
3416 esp_done(esp
, (DID_BAD_TARGET
<< 16));
3421 ESPLOG(("esp%d: Selection failure.\n", esp
->esp_id
));
3422 printk("esp%d: Currently -- ", esp
->esp_id
);
3423 esp_print_ireg(esp
->ireg
); printk(" ");
3424 esp_print_statreg(esp
->sreg
); printk(" ");
3425 esp_print_seqreg(esp
->seqreg
); printk("\n");
3426 printk("esp%d: New -- ", esp
->esp_id
);
3427 esp
->sreg
= sbus_readb(esp
->eregs
+ ESP_STATUS
);
3428 esp
->seqreg
= sbus_readb(esp
->eregs
+ ESP_SSTEP
);
3429 esp
->ireg
= sbus_readb(esp
->eregs
+ ESP_INTRPT
);
3430 esp_print_ireg(esp
->ireg
); printk(" ");
3431 esp_print_statreg(esp
->sreg
); printk(" ");
3432 esp_print_seqreg(esp
->seqreg
); printk("\n");
3433 ESPLOG(("esp%d: resetting bus\n", esp
->esp_id
));
3434 return do_reset_bus
; /* ugh... */
3437 /* Continue reading bytes for msgin phase. */
3438 static int esp_do_msgincont(struct esp
*esp
)
3440 if (esp
->ireg
& ESP_INTR_BSERV
) {
3441 /* in the right phase too? */
3442 if ((esp
->sreg
& ESP_STAT_PMASK
) == ESP_MIP
) {
3444 esp_cmd(esp
, ESP_CMD_TI
);
3445 esp_advance_phase(esp
->current_SC
, in_msgindone
);
3449 /* We changed phase but ESP shows bus service,
3450 * in this case it is most likely that we, the
3451 * hacker who has been up for 20hrs straight
3452 * staring at the screen, drowned in coffee
3453 * smelling like retched cigarette ashes
3454 * have miscoded something..... so, try to
3455 * recover as best we can.
3457 ESPLOG(("esp%d: message in mis-carriage.\n", esp
->esp_id
));
3459 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3460 return do_phase_determine
;
3463 static int check_singlebyte_msg(struct esp
*esp
)
3465 esp
->prevmsgin
= esp
->cur_msgin
[0];
3466 if (esp
->cur_msgin
[0] & 0x80) {
3468 ESPLOG(("esp%d: target sends identify amidst phases\n",
3470 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3472 } else if (((esp
->cur_msgin
[0] & 0xf0) == 0x20) ||
3473 (esp
->cur_msgin
[0] == EXTENDED_MESSAGE
)) {
3475 esp_advance_phase(esp
->current_SC
, in_msgincont
);
3478 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3479 switch (esp
->cur_msgin
[0]) {
3481 /* We don't want to hear about it. */
3482 ESPLOG(("esp%d: msg %02x which we don't know about\n", esp
->esp_id
,
3483 esp
->cur_msgin
[0]));
3484 return MESSAGE_REJECT
;
3487 ESPLOG(("esp%d: target %d sends a nop\n", esp
->esp_id
,
3488 esp
->current_SC
->device
->id
));
3491 case RESTORE_POINTERS
:
3492 /* In this case we might also have to backup the
3493 * "slow command" pointer. It is rare to get such
3494 * a save/restore pointer sequence so early in the
3495 * bus transition sequences, but cover it.
3497 if (esp
->esp_slowcmd
) {
3498 esp
->esp_scmdleft
= esp
->current_SC
->cmd_len
;
3499 esp
->esp_scmdp
= &esp
->current_SC
->cmnd
[0];
3501 esp_restore_pointers(esp
, esp
->current_SC
);
3505 esp_save_pointers(esp
, esp
->current_SC
);
3508 case COMMAND_COMPLETE
:
3510 /* Freeing the bus, let it go. */
3511 esp
->current_SC
->SCp
.phase
= in_freeing
;
3514 case MESSAGE_REJECT
:
3515 ESPMISC(("msg reject, "));
3516 if (esp
->prevmsgout
== EXTENDED_MESSAGE
) {
3517 struct esp_device
*esp_dev
= esp
->current_SC
->device
->hostdata
;
3519 /* Doesn't look like this target can
3520 * do synchronous or WIDE transfers.
3522 ESPSDTR(("got reject, was trying nego, clearing sync/WIDE\n"));
3525 esp_dev
->sync_min_period
= 0;
3526 esp_dev
->sync_max_offset
= 0;
3529 ESPMISC(("not sync nego, sending ABORT\n"));
3535 /* Target negotiates for synchronous transfers before we do, this
3536 * is legal although very strange. What is even funnier is that
3537 * the SCSI2 standard specifically recommends against targets doing
3538 * this because so many initiators cannot cope with this occurring.
3540 static int target_with_ants_in_pants(struct esp
*esp
,
3541 struct scsi_cmnd
*SCptr
,
3542 struct esp_device
*esp_dev
)
3544 if (esp_dev
->sync
|| SCptr
->device
->borken
) {
3545 /* sorry, no can do */
3546 ESPSDTR(("forcing to async, "));
3547 build_sync_nego_msg(esp
, 0, 0);
3550 ESPLOG(("esp%d: hoping for msgout\n", esp
->esp_id
));
3551 esp_advance_phase(SCptr
, in_the_dark
);
3552 return EXTENDED_MESSAGE
;
3555 /* Ok, we'll check them out... */
3559 static void sync_report(struct esp
*esp
)
3564 msg3
= esp
->cur_msgin
[3];
3565 msg4
= esp
->cur_msgin
[4];
3567 int hz
= 1000000000 / (msg3
* 4);
3568 int integer
= hz
/ 1000000;
3569 int fraction
= (hz
- (integer
* 1000000)) / 10000;
3570 if ((esp
->erev
== fashme
) &&
3571 (esp
->config3
[esp
->current_SC
->device
->id
] & ESP_CONFIG3_EWIDE
)) {
3575 } else if ((msg3
* 4) < 200) {
3578 type
= "synchronous";
3581 /* Do not transform this back into one big printk
3582 * again, it triggers a bug in our sparc64-gcc272
3583 * sibling call optimization. -DaveM
3585 ESPLOG((KERN_INFO
"esp%d: target %d ",
3586 esp
->esp_id
, esp
->current_SC
->device
->id
));
3587 ESPLOG(("[period %dns offset %d %d.%02dMHz ",
3588 (int) msg3
* 4, (int) msg4
,
3589 integer
, fraction
));
3590 ESPLOG(("%s SCSI%s]\n", type
,
3591 (((msg3
* 4) < 200) ? "-II" : "")));
3593 ESPLOG((KERN_INFO
"esp%d: target %d asynchronous\n",
3594 esp
->esp_id
, esp
->current_SC
->device
->id
));
3598 static int check_multibyte_msg(struct esp
*esp
)
3600 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
3601 struct esp_device
*esp_dev
= SCptr
->device
->hostdata
;
3603 int message_out
= 0;
3605 ESPSDTR(("chk multibyte msg: "));
3606 if (esp
->cur_msgin
[2] == EXTENDED_SDTR
) {
3607 int period
= esp
->cur_msgin
[3];
3608 int offset
= esp
->cur_msgin
[4];
3610 ESPSDTR(("is sync nego response, "));
3614 /* Target negotiates first! */
3615 ESPSDTR(("target jumps the gun, "));
3616 message_out
= EXTENDED_MESSAGE
; /* we must respond */
3617 rval
= target_with_ants_in_pants(esp
, SCptr
, esp_dev
);
3622 ESPSDTR(("examining sdtr, "));
3624 /* Offset cannot be larger than ESP fifo size. */
3626 ESPSDTR(("offset too big %2x, ", offset
));
3628 ESPSDTR(("sending back new offset\n"));
3629 build_sync_nego_msg(esp
, period
, offset
);
3630 return EXTENDED_MESSAGE
;
3633 if (offset
&& period
> esp
->max_period
) {
3634 /* Yeee, async for this slow device. */
3635 ESPSDTR(("period too long %2x, ", period
));
3636 build_sync_nego_msg(esp
, 0, 0);
3637 ESPSDTR(("hoping for msgout\n"));
3638 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3639 return EXTENDED_MESSAGE
;
3640 } else if (offset
&& period
< esp
->min_period
) {
3641 ESPSDTR(("period too short %2x, ", period
));
3642 period
= esp
->min_period
;
3643 if (esp
->erev
> esp236
)
3647 } else if (offset
) {
3650 ESPSDTR(("period is ok, "));
3651 tmp
= esp
->ccycle
/ 1000;
3652 regval
= (((period
<< 2) + tmp
- 1) / tmp
);
3653 if (regval
&& ((esp
->erev
== fas100a
||
3654 esp
->erev
== fas236
||
3655 esp
->erev
== fashme
))) {
3664 esp_dev
->sync_min_period
= (regval
& 0x1f);
3665 esp_dev
->sync_max_offset
= (offset
| esp
->radelay
);
3666 if (esp
->erev
== fas100a
|| esp
->erev
== fas236
|| esp
->erev
== fashme
) {
3667 if ((esp
->erev
== fas100a
) || (esp
->erev
== fashme
))
3668 bit
= ESP_CONFIG3_FAST
;
3670 bit
= ESP_CONFIG3_FSCSI
;
3672 /* On FAS366, if using fast-20 synchronous transfers
3673 * we need to make sure the REQ/ACK assert/deassert
3674 * control bits are clear.
3676 if (esp
->erev
== fashme
)
3677 esp_dev
->sync_max_offset
&= ~esp
->radelay
;
3678 esp
->config3
[SCptr
->device
->id
] |= bit
;
3680 esp
->config3
[SCptr
->device
->id
] &= ~bit
;
3682 esp
->prev_cfg3
= esp
->config3
[SCptr
->device
->id
];
3683 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
3685 esp
->prev_soff
= esp_dev
->sync_max_offset
;
3686 esp
->prev_stp
= esp_dev
->sync_min_period
;
3687 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
3688 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
3689 ESPSDTR(("soff=%2x stp=%2x cfg3=%2x\n",
3690 esp_dev
->sync_max_offset
,
3691 esp_dev
->sync_min_period
,
3692 esp
->config3
[SCptr
->device
->id
]));
3695 } else if (esp_dev
->sync_max_offset
) {
3698 /* back to async mode */
3699 ESPSDTR(("unaccaptable sync nego, forcing async\n"));
3700 esp_dev
->sync_max_offset
= 0;
3701 esp_dev
->sync_min_period
= 0;
3704 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
3705 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
3706 if (esp
->erev
== fas100a
|| esp
->erev
== fas236
|| esp
->erev
== fashme
) {
3707 if ((esp
->erev
== fas100a
) || (esp
->erev
== fashme
))
3708 bit
= ESP_CONFIG3_FAST
;
3710 bit
= ESP_CONFIG3_FSCSI
;
3711 esp
->config3
[SCptr
->device
->id
] &= ~bit
;
3712 esp
->prev_cfg3
= esp
->config3
[SCptr
->device
->id
];
3713 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
3719 ESPSDTR(("chk multibyte msg: sync is known, "));
3723 ESPLOG(("esp%d: sending sdtr back, hoping for msgout\n",
3725 build_sync_nego_msg(esp
, period
, offset
);
3726 esp_advance_phase(SCptr
, in_the_dark
);
3727 return EXTENDED_MESSAGE
;
3730 ESPSDTR(("returning zero\n"));
3731 esp_advance_phase(SCptr
, in_the_dark
); /* ...or else! */
3733 } else if (esp
->cur_msgin
[2] == EXTENDED_WDTR
) {
3734 int size
= 8 << esp
->cur_msgin
[3];
3737 if (esp
->erev
!= fashme
) {
3738 ESPLOG(("esp%d: AIEEE wide msg received and not HME.\n",
3740 message_out
= MESSAGE_REJECT
;
3741 } else if (size
> 16) {
3742 ESPLOG(("esp%d: AIEEE wide transfer for %d size "
3743 "not supported.\n", esp
->esp_id
, size
));
3744 message_out
= MESSAGE_REJECT
;
3746 /* Things look good; let's see what we got. */
3748 /* Set config 3 register for this target. */
3749 esp
->config3
[SCptr
->device
->id
] |= ESP_CONFIG3_EWIDE
;
3751 /* Just make sure it was one byte sized. */
3753 ESPLOG(("esp%d: Aieee, wide nego of %d size.\n",
3754 esp
->esp_id
, size
));
3755 message_out
= MESSAGE_REJECT
;
3758 /* Pure paranoia. */
3759 esp
->config3
[SCptr
->device
->id
] &= ~(ESP_CONFIG3_EWIDE
);
3761 esp
->prev_cfg3
= esp
->config3
[SCptr
->device
->id
];
3762 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
3764 /* Regardless, next try for sync transfers. */
3765 build_sync_nego_msg(esp
, esp
->sync_defp
, 15);
3768 message_out
= EXTENDED_MESSAGE
;
3770 } else if (esp
->cur_msgin
[2] == EXTENDED_MODIFY_DATA_POINTER
) {
3771 ESPLOG(("esp%d: rejecting modify data ptr msg\n", esp
->esp_id
));
3772 message_out
= MESSAGE_REJECT
;
3775 esp_advance_phase(SCptr
, in_the_dark
);
3779 static int esp_do_msgindone(struct esp
*esp
)
3781 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
3782 int message_out
= 0, it
= 0, rval
;
3784 rval
= skipahead1(esp
, SCptr
, in_msgin
, in_msgindone
);
3787 if (SCptr
->SCp
.sent_command
!= in_status
) {
3788 if (!(esp
->ireg
& ESP_INTR_DC
)) {
3789 if (esp
->msgin_len
&& (esp
->sreg
& ESP_STAT_PERR
)) {
3790 message_out
= MSG_PARITY_ERROR
;
3791 esp_cmd(esp
, ESP_CMD_FLUSH
);
3792 } else if (esp
->erev
!= fashme
&&
3793 (it
= (sbus_readb(esp
->eregs
+ ESP_FFLAGS
) & ESP_FF_FBYTES
)) != 1) {
3794 /* We certainly dropped the ball somewhere. */
3795 message_out
= INITIATOR_ERROR
;
3796 esp_cmd(esp
, ESP_CMD_FLUSH
);
3797 } else if (!esp
->msgin_len
) {
3798 if (esp
->erev
== fashme
)
3799 it
= esp
->hme_fifo_workaround_buffer
[0];
3801 it
= sbus_readb(esp
->eregs
+ ESP_FDATA
);
3802 esp_advance_phase(SCptr
, in_msgincont
);
3804 /* it is ok and we want it */
3805 if (esp
->erev
== fashme
)
3806 it
= esp
->cur_msgin
[esp
->msgin_ctr
] =
3807 esp
->hme_fifo_workaround_buffer
[0];
3809 it
= esp
->cur_msgin
[esp
->msgin_ctr
] =
3810 sbus_readb(esp
->eregs
+ ESP_FDATA
);
3814 esp_advance_phase(SCptr
, in_the_dark
);
3818 it
= esp
->cur_msgin
[0];
3820 if (!message_out
&& esp
->msgin_len
) {
3821 if (esp
->msgin_ctr
< esp
->msgin_len
) {
3822 esp_advance_phase(SCptr
, in_msgincont
);
3823 } else if (esp
->msgin_len
== 1) {
3824 message_out
= check_singlebyte_msg(esp
);
3825 } else if (esp
->msgin_len
== 2) {
3826 if (esp
->cur_msgin
[0] == EXTENDED_MESSAGE
) {
3827 if ((it
+ 2) >= 15) {
3828 message_out
= MESSAGE_REJECT
;
3830 esp
->msgin_len
= (it
+ 2);
3831 esp_advance_phase(SCptr
, in_msgincont
);
3834 message_out
= MESSAGE_REJECT
; /* foo on you */
3837 message_out
= check_multibyte_msg(esp
);
3840 if (message_out
< 0) {
3841 return -message_out
;
3842 } else if (message_out
) {
3843 if (((message_out
!= 1) &&
3844 ((message_out
< 0x20) || (message_out
& 0x80))))
3845 esp
->msgout_len
= 1;
3846 esp
->cur_msgout
[0] = message_out
;
3847 esp_cmd(esp
, ESP_CMD_SATN
);
3848 esp_advance_phase(SCptr
, in_the_dark
);
3851 esp
->sreg
= sbus_readb(esp
->eregs
+ ESP_STATUS
);
3852 esp
->sreg
&= ~(ESP_STAT_INTR
);
3853 if ((esp
->sreg
& (ESP_STAT_PMSG
|ESP_STAT_PCD
)) == (ESP_STAT_PMSG
|ESP_STAT_PCD
))
3854 esp_cmd(esp
, ESP_CMD_MOK
);
3855 if ((SCptr
->SCp
.sent_command
== in_msgindone
) &&
3856 (SCptr
->SCp
.phase
== in_freeing
))
3857 return esp_do_freebus(esp
);
3861 static int esp_do_cmdbegin(struct esp
*esp
)
3863 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
3865 esp_advance_phase(SCptr
, in_cmdend
);
3866 if (esp
->erev
== fashme
) {
3867 u32 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
3870 for (i
= 0; i
< esp
->esp_scmdleft
; i
++)
3871 esp
->esp_command
[i
] = *esp
->esp_scmdp
++;
3872 esp
->esp_scmdleft
= 0;
3873 esp_cmd(esp
, ESP_CMD_FLUSH
);
3874 esp_setcount(esp
->eregs
, i
, 1);
3875 esp_cmd(esp
, (ESP_CMD_DMA
| ESP_CMD_TI
));
3876 tmp
|= (DMA_SCSI_DISAB
| DMA_ENABLE
);
3877 tmp
&= ~(DMA_ST_WRITE
);
3878 sbus_writel(i
, esp
->dregs
+ DMA_COUNT
);
3879 sbus_writel(esp
->esp_command_dvma
, esp
->dregs
+ DMA_ADDR
);
3880 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
3884 esp_cmd(esp
, ESP_CMD_FLUSH
);
3885 tmp
= *esp
->esp_scmdp
++;
3886 esp
->esp_scmdleft
--;
3887 sbus_writeb(tmp
, esp
->eregs
+ ESP_FDATA
);
3888 esp_cmd(esp
, ESP_CMD_TI
);
3893 static int esp_do_cmddone(struct esp
*esp
)
3895 if (esp
->erev
== fashme
)
3896 dma_invalidate(esp
);
3898 esp_cmd(esp
, ESP_CMD_NULL
);
3900 if (esp
->ireg
& ESP_INTR_BSERV
) {
3901 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3902 return esp_do_phase_determine(esp
);
3905 ESPLOG(("esp%d: in do_cmddone() but didn't get BSERV interrupt.\n",
3907 return do_reset_bus
;
3910 static int esp_do_msgout(struct esp
*esp
)
3912 esp_cmd(esp
, ESP_CMD_FLUSH
);
3913 switch (esp
->msgout_len
) {
3915 if (esp
->erev
== fashme
)
3916 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 1);
3918 sbus_writeb(esp
->cur_msgout
[0], esp
->eregs
+ ESP_FDATA
);
3920 esp_cmd(esp
, ESP_CMD_TI
);
3924 esp
->esp_command
[0] = esp
->cur_msgout
[0];
3925 esp
->esp_command
[1] = esp
->cur_msgout
[1];
3927 if (esp
->erev
== fashme
) {
3928 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 2);
3929 esp_cmd(esp
, ESP_CMD_TI
);
3931 dma_setup(esp
, esp
->esp_command_dvma
, 2, 0);
3932 esp_setcount(esp
->eregs
, 2, 0);
3933 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
3938 esp
->esp_command
[0] = esp
->cur_msgout
[0];
3939 esp
->esp_command
[1] = esp
->cur_msgout
[1];
3940 esp
->esp_command
[2] = esp
->cur_msgout
[2];
3941 esp
->esp_command
[3] = esp
->cur_msgout
[3];
3944 if (esp
->erev
== fashme
) {
3945 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 4);
3946 esp_cmd(esp
, ESP_CMD_TI
);
3948 dma_setup(esp
, esp
->esp_command_dvma
, 4, 0);
3949 esp_setcount(esp
->eregs
, 4, 0);
3950 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
3955 esp
->esp_command
[0] = esp
->cur_msgout
[0];
3956 esp
->esp_command
[1] = esp
->cur_msgout
[1];
3957 esp
->esp_command
[2] = esp
->cur_msgout
[2];
3958 esp
->esp_command
[3] = esp
->cur_msgout
[3];
3959 esp
->esp_command
[4] = esp
->cur_msgout
[4];
3962 if (esp
->erev
== fashme
) {
3963 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 5);
3964 esp_cmd(esp
, ESP_CMD_TI
);
3966 dma_setup(esp
, esp
->esp_command_dvma
, 5, 0);
3967 esp_setcount(esp
->eregs
, 5, 0);
3968 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
3974 ESPMISC(("bogus msgout sending NOP\n"));
3975 esp
->cur_msgout
[0] = NOP
;
3977 if (esp
->erev
== fashme
) {
3978 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 1);
3980 sbus_writeb(esp
->cur_msgout
[0], esp
->eregs
+ ESP_FDATA
);
3983 esp
->msgout_len
= 1;
3984 esp_cmd(esp
, ESP_CMD_TI
);
3988 esp_advance_phase(esp
->current_SC
, in_msgoutdone
);
3992 static int esp_do_msgoutdone(struct esp
*esp
)
3994 if (esp
->msgout_len
> 1) {
3995 /* XXX HME/FAS ATN deassert workaround required,
3996 * XXX no DMA flushing, only possible ESP_CMD_FLUSH
3997 * XXX to kill the fifo.
3999 if (esp
->erev
!= fashme
) {
4002 while ((tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
)) & DMA_PEND_READ
)
4005 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
4006 dma_invalidate(esp
);
4008 esp_cmd(esp
, ESP_CMD_FLUSH
);
4011 if (!(esp
->ireg
& ESP_INTR_DC
)) {
4012 if (esp
->erev
!= fashme
)
4013 esp_cmd(esp
, ESP_CMD_NULL
);
4014 switch (esp
->sreg
& ESP_STAT_PMASK
) {
4016 /* whoops, parity error */
4017 ESPLOG(("esp%d: still in msgout, parity error assumed\n",
4019 if (esp
->msgout_len
> 1)
4020 esp_cmd(esp
, ESP_CMD_SATN
);
4021 esp_advance_phase(esp
->current_SC
, in_msgout
);
4028 /* Happy Meal fifo is touchy... */
4029 if ((esp
->erev
!= fashme
) &&
4031 !(((struct esp_device
*)esp
->current_SC
->device
->hostdata
)->sync_max_offset
))
4032 esp_cmd(esp
, ESP_CMD_FLUSH
);
4037 ESPLOG(("esp%d: disconnect, resetting bus\n", esp
->esp_id
));
4038 return do_reset_bus
;
4041 /* If we sent out a synchronous negotiation message, update
4044 if (esp
->cur_msgout
[2] == EXTENDED_MESSAGE
&&
4045 esp
->cur_msgout
[4] == EXTENDED_SDTR
) {
4046 esp
->snip
= 1; /* anal retentiveness... */
4049 esp
->prevmsgout
= esp
->cur_msgout
[0];
4050 esp
->msgout_len
= 0;
4051 esp_advance_phase(esp
->current_SC
, in_the_dark
);
4052 return esp_do_phase_determine(esp
);
4055 static int esp_bus_unexpected(struct esp
*esp
)
4057 ESPLOG(("esp%d: command in weird state %2x\n",
4058 esp
->esp_id
, esp
->current_SC
->SCp
.phase
));
4059 return do_reset_bus
;
4062 static espfunc_t bus_vector
[] = {
4075 esp_do_phase_determine
,
4081 /* This is the second tier in our dual-level SCSI state machine. */
4082 static int esp_work_bus(struct esp
*esp
)
4084 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
4087 ESPBUS(("esp_work_bus: "));
4089 ESPBUS(("reconnect\n"));
4090 return esp_do_reconnect(esp
);
4092 phase
= SCptr
->SCp
.phase
;
4093 if ((phase
& 0xf0) == in_phases_mask
)
4094 return bus_vector
[(phase
& 0x0f)](esp
);
4095 else if ((phase
& 0xf0) == in_slct_mask
)
4096 return esp_select_complete(esp
);
4098 return esp_bus_unexpected(esp
);
4101 static espfunc_t isvc_vector
[] = {
4103 esp_do_phase_determine
,
4109 /* Main interrupt handler for an esp adapter. */
4110 static void esp_handle(struct esp
*esp
)
4112 struct scsi_cmnd
*SCptr
;
4113 int what_next
= do_intr_end
;
4115 SCptr
= esp
->current_SC
;
4117 /* Check for errors. */
4118 esp
->sreg
= sbus_readb(esp
->eregs
+ ESP_STATUS
);
4119 esp
->sreg
&= (~ESP_STAT_INTR
);
4120 if (esp
->erev
== fashme
) {
4121 esp
->sreg2
= sbus_readb(esp
->eregs
+ ESP_STATUS2
);
4122 esp
->seqreg
= (sbus_readb(esp
->eregs
+ ESP_SSTEP
) & ESP_STEP_VBITS
);
4125 if (esp
->sreg
& (ESP_STAT_SPAM
)) {
4126 /* Gross error, could be due to one of:
4128 * - top of fifo overwritten, could be because
4129 * we tried to do a synchronous transfer with
4130 * an offset greater than ESP fifo size
4132 * - top of command register overwritten
4134 * - DMA setup to go in one direction, SCSI
4135 * bus points in the other, whoops
4137 * - weird phase change during asynchronous
4138 * data phase while we are initiator
4140 ESPLOG(("esp%d: Gross error sreg=%2x\n", esp
->esp_id
, esp
->sreg
));
4142 /* If a command is live on the bus we cannot safely
4143 * reset the bus, so we'll just let the pieces fall
4144 * where they may. Here we are hoping that the
4145 * target will be able to cleanly go away soon
4146 * so we can safely reset things.
4149 ESPLOG(("esp%d: No current cmd during gross error, "
4150 "resetting bus\n", esp
->esp_id
));
4151 what_next
= do_reset_bus
;
4156 if (sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_HNDL_ERROR
) {
4157 /* A DMA gate array error. Here we must
4158 * be seeing one of two things. Either the
4159 * virtual to physical address translation
4160 * on the SBUS could not occur, else the
4161 * translation it did get pointed to a bogus
4164 ESPLOG(("esp%d: DMA error %08x\n", esp
->esp_id
,
4165 sbus_readl(esp
->dregs
+ DMA_CSR
)));
4167 /* DMA gate array itself must be reset to clear the
4172 what_next
= do_reset_bus
;
4176 esp
->ireg
= sbus_readb(esp
->eregs
+ ESP_INTRPT
); /* Unlatch intr reg */
4178 if (esp
->erev
== fashme
) {
4179 /* This chip is really losing. */
4182 ESPHME(("sreg2=%02x,", esp
->sreg2
));
4183 /* Must latch fifo before reading the interrupt
4184 * register else garbage ends up in the FIFO
4185 * which confuses the driver utterly.
4187 if (!(esp
->sreg2
& ESP_STAT2_FEMPTY
) ||
4188 (esp
->sreg2
& ESP_STAT2_F1BYTE
)) {
4189 ESPHME(("fifo_workaround]"));
4192 ESPHME(("no_fifo_workaround]"));
4196 /* No current cmd is only valid at this point when there are
4197 * commands off the bus or we are trying a reset.
4199 if (!SCptr
&& !esp
->disconnected_SC
&& !(esp
->ireg
& ESP_INTR_SR
)) {
4200 /* Panic is safe, since current_SC is null. */
4201 ESPLOG(("esp%d: no command in esp_handle()\n", esp
->esp_id
));
4202 panic("esp_handle: current_SC == penguin within interrupt!");
4205 if (esp
->ireg
& (ESP_INTR_IC
)) {
4206 /* Illegal command fed to ESP. Outside of obvious
4207 * software bugs that could cause this, there is
4208 * a condition with esp100 where we can confuse the
4209 * ESP into an erroneous illegal command interrupt
4210 * because it does not scrape the FIFO properly
4211 * for reselection. See esp100_reconnect_hwbug()
4212 * to see how we try very hard to avoid this.
4214 ESPLOG(("esp%d: invalid command\n", esp
->esp_id
));
4216 esp_dump_state(esp
);
4218 if (SCptr
!= NULL
) {
4219 /* Devices with very buggy firmware can drop BSY
4220 * during a scatter list interrupt when using sync
4221 * mode transfers. We continue the transfer as
4222 * expected, the target drops the bus, the ESP
4223 * gets confused, and we get a illegal command
4224 * interrupt because the bus is in the disconnected
4225 * state now and ESP_CMD_TI is only allowed when
4226 * a nexus is alive on the bus.
4228 ESPLOG(("esp%d: Forcing async and disabling disconnect for "
4229 "target %d\n", esp
->esp_id
, SCptr
->device
->id
));
4230 SCptr
->device
->borken
= 1; /* foo on you */
4233 what_next
= do_reset_bus
;
4234 } else if (!(esp
->ireg
& ~(ESP_INTR_FDONE
| ESP_INTR_BSERV
| ESP_INTR_DC
))) {
4236 unsigned int phase
= SCptr
->SCp
.phase
;
4238 if (phase
& in_phases_mask
) {
4239 what_next
= esp_work_bus(esp
);
4240 } else if (phase
& in_slct_mask
) {
4241 what_next
= esp_select_complete(esp
);
4243 ESPLOG(("esp%d: interrupt for no good reason...\n",
4245 what_next
= do_intr_end
;
4248 ESPLOG(("esp%d: BSERV or FDONE or DC while SCptr==NULL\n",
4250 what_next
= do_reset_bus
;
4252 } else if (esp
->ireg
& ESP_INTR_SR
) {
4253 ESPLOG(("esp%d: SCSI bus reset interrupt\n", esp
->esp_id
));
4254 what_next
= do_reset_complete
;
4255 } else if (esp
->ireg
& (ESP_INTR_S
| ESP_INTR_SATN
)) {
4256 ESPLOG(("esp%d: AIEEE we have been selected by another initiator!\n",
4258 what_next
= do_reset_bus
;
4259 } else if (esp
->ireg
& ESP_INTR_RSEL
) {
4260 if (SCptr
== NULL
) {
4262 what_next
= esp_do_reconnect(esp
);
4263 } else if (SCptr
->SCp
.phase
& in_slct_mask
) {
4264 /* Only selection code knows how to clean
4267 ESPDISC(("Reselected during selection attempt\n"));
4268 what_next
= esp_select_complete(esp
);
4270 ESPLOG(("esp%d: Reselected while bus is busy\n",
4272 what_next
= do_reset_bus
;
4276 /* This is tier-one in our dual level SCSI state machine. */
4278 while (what_next
!= do_intr_end
) {
4279 if (what_next
>= do_phase_determine
&&
4280 what_next
< do_intr_end
) {
4281 what_next
= isvc_vector
[what_next
](esp
);
4283 /* state is completely lost ;-( */
4284 ESPLOG(("esp%d: interrupt engine loses state, resetting bus\n",
4286 what_next
= do_reset_bus
;
4291 /* Service only the ESP described by dev_id. */
4292 static irqreturn_t
esp_intr(int irq
, void *dev_id
, struct pt_regs
*pregs
)
4294 struct esp
*esp
= dev_id
;
4295 unsigned long flags
;
4297 spin_lock_irqsave(esp
->ehost
->host_lock
, flags
);
4298 if (ESP_IRQ_P(esp
->dregs
)) {
4299 ESP_INTSOFF(esp
->dregs
);
4301 ESPIRQ(("I[%d:%d](", smp_processor_id(), esp
->esp_id
));
4305 ESP_INTSON(esp
->dregs
);
4307 spin_unlock_irqrestore(esp
->ehost
->host_lock
, flags
);
4312 static int esp_slave_alloc(struct scsi_device
*SDptr
)
4314 struct esp_device
*esp_dev
=
4315 kmalloc(sizeof(struct esp_device
), GFP_ATOMIC
);
4319 memset(esp_dev
, 0, sizeof(struct esp_device
));
4320 SDptr
->hostdata
= esp_dev
;
4324 static void esp_slave_destroy(struct scsi_device
*SDptr
)
4326 struct esp
*esp
= (struct esp
*) SDptr
->host
->hostdata
;
4328 esp
->targets_present
&= ~(1 << SDptr
->id
);
4329 kfree(SDptr
->hostdata
);
4330 SDptr
->hostdata
= NULL
;
4333 static struct scsi_host_template esp_template
= {
4334 .module
= THIS_MODULE
,
4337 .slave_alloc
= esp_slave_alloc
,
4338 .slave_destroy
= esp_slave_destroy
,
4339 .queuecommand
= esp_queue
,
4340 .eh_abort_handler
= esp_abort
,
4341 .eh_bus_reset_handler
= esp_reset
,
4344 .sg_tablesize
= SG_ALL
,
4346 .use_clustering
= ENABLE_CLUSTERING
,
4348 .proc_info
= esp_proc_info
,
4352 static struct of_device_id esp_match
[] = {
4355 .data
= &esp_template
,
4359 .data
= &esp_template
,
4363 .data
= &esp_template
,
4367 MODULE_DEVICE_TABLE(of
, esp_match
);
4369 static struct of_platform_driver esp_sbus_driver
= {
4371 .match_table
= esp_match
,
4372 .probe
= esp_sbus_probe
,
4373 .remove
= __devexit_p(esp_sbus_remove
),
4377 static int __init
esp_init(void)
4380 return esp_sun4_probe(&esp_template
);
4382 return of_register_driver(&esp_sbus_driver
, &sbus_bus_type
);
4386 static void __exit
esp_exit(void)
4391 of_unregister_driver(&esp_sbus_driver
);
4395 MODULE_DESCRIPTION("ESP Sun SCSI driver");
4396 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
4397 MODULE_LICENSE("GPL");
4398 MODULE_VERSION(DRV_VERSION
);
4400 module_init(esp_init
);
4401 module_exit(esp_exit
);