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/kernel.h>
16 #include <linux/delay.h>
17 #include <linux/types.h>
18 #include <linux/string.h>
19 #include <linux/slab.h>
20 #include <linux/blkdev.h>
21 #include <linux/proc_fs.h>
22 #include <linux/stat.h>
23 #include <linux/init.h>
24 #include <linux/spinlock.h>
25 #include <linux/interrupt.h>
26 #include <linux/module.h>
32 #include <asm/system.h>
33 #include <asm/ptrace.h>
34 #include <asm/pgtable.h>
35 #include <asm/oplib.h>
39 #include <asm/machines.h>
40 #include <asm/idprom.h>
43 #include <scsi/scsi.h>
44 #include <scsi/scsi_cmnd.h>
45 #include <scsi/scsi_device.h>
46 #include <scsi/scsi_eh.h>
47 #include <scsi/scsi_host.h>
48 #include <scsi/scsi_tcq.h>
50 #define DRV_VERSION "1.101"
53 /* #define DEBUG_ESP_HME */
54 /* #define DEBUG_ESP_DATA */
55 /* #define DEBUG_ESP_QUEUE */
56 /* #define DEBUG_ESP_DISCONNECT */
57 /* #define DEBUG_ESP_STATUS */
58 /* #define DEBUG_ESP_PHASES */
59 /* #define DEBUG_ESP_WORKBUS */
60 /* #define DEBUG_STATE_MACHINE */
61 /* #define DEBUG_ESP_CMDS */
62 /* #define DEBUG_ESP_IRQS */
63 /* #define DEBUG_SDTR */
64 /* #define DEBUG_ESP_SG */
66 /* Use the following to sprinkle debugging messages in a way which
67 * suits you if combinations of the above become too verbose when
68 * trying to track down a specific problem.
70 /* #define DEBUG_ESP_MISC */
72 #if defined(DEBUG_ESP)
73 #define ESPLOG(foo) printk foo
76 #endif /* (DEBUG_ESP) */
78 #if defined(DEBUG_ESP_HME)
79 #define ESPHME(foo) printk foo
84 #if defined(DEBUG_ESP_DATA)
85 #define ESPDATA(foo) printk foo
90 #if defined(DEBUG_ESP_QUEUE)
91 #define ESPQUEUE(foo) printk foo
96 #if defined(DEBUG_ESP_DISCONNECT)
97 #define ESPDISC(foo) printk foo
102 #if defined(DEBUG_ESP_STATUS)
103 #define ESPSTAT(foo) printk foo
108 #if defined(DEBUG_ESP_PHASES)
109 #define ESPPHASE(foo) printk foo
111 #define ESPPHASE(foo)
114 #if defined(DEBUG_ESP_WORKBUS)
115 #define ESPBUS(foo) printk foo
120 #if defined(DEBUG_ESP_IRQS)
121 #define ESPIRQ(foo) printk foo
126 #if defined(DEBUG_SDTR)
127 #define ESPSDTR(foo) printk foo
132 #if defined(DEBUG_ESP_MISC)
133 #define ESPMISC(foo) printk foo
138 /* Command phase enumeration. */
140 not_issued
= 0x00, /* Still in the issue_SC queue. */
142 /* Various forms of selecting a target. */
143 #define in_slct_mask 0x10
144 in_slct_norm
= 0x10, /* ESP is arbitrating, normal selection */
145 in_slct_stop
= 0x11, /* ESP will select, then stop with IRQ */
146 in_slct_msg
= 0x12, /* select, then send a message */
147 in_slct_tag
= 0x13, /* select and send tagged queue msg */
148 in_slct_sneg
= 0x14, /* select and acquire sync capabilities */
150 /* Any post selection activity. */
151 #define in_phases_mask 0x20
152 in_datain
= 0x20, /* Data is transferring from the bus */
153 in_dataout
= 0x21, /* Data is transferring to the bus */
154 in_data_done
= 0x22, /* Last DMA data operation done (maybe) */
155 in_msgin
= 0x23, /* Eating message from target */
156 in_msgincont
= 0x24, /* Eating more msg bytes from target */
157 in_msgindone
= 0x25, /* Decide what to do with what we got */
158 in_msgout
= 0x26, /* Sending message to target */
159 in_msgoutdone
= 0x27, /* Done sending msg out */
160 in_cmdbegin
= 0x28, /* Sending cmd after abnormal selection */
161 in_cmdend
= 0x29, /* Done sending slow cmd */
162 in_status
= 0x2a, /* Was in status phase, finishing cmd */
163 in_freeing
= 0x2b, /* freeing the bus for cmd cmplt or disc */
164 in_the_dark
= 0x2c, /* Don't know what bus phase we are in */
166 /* Special states, ie. not normal bus transitions... */
167 #define in_spec_mask 0x80
168 in_abortone
= 0x80, /* Aborting one command currently */
169 in_abortall
= 0x81, /* Blowing away all commands we have */
170 in_resetdev
= 0x82, /* SCSI target reset in progress */
171 in_resetbus
= 0x83, /* SCSI bus reset in progress */
172 in_tgterror
= 0x84, /* Target did something stupid */
176 /* Zero has special meaning, see skipahead[12]. */
179 /*1*/ do_phase_determine
,
181 /*3*/ do_reset_complete
,
186 /* Forward declarations. */
187 static irqreturn_t
esp_intr(int irq
, void *dev_id
, struct pt_regs
*pregs
);
189 /* Debugging routines */
190 struct esp_cmdstrings
{
193 } esp_cmd_strings
[] = {
195 { ESP_CMD_NULL
, "ESP_NOP", },
196 { ESP_CMD_FLUSH
, "FIFO_FLUSH", },
197 { ESP_CMD_RC
, "RSTESP", },
198 { ESP_CMD_RS
, "RSTSCSI", },
199 /* Disconnected State Group */
200 { ESP_CMD_RSEL
, "RESLCTSEQ", },
201 { ESP_CMD_SEL
, "SLCTNATN", },
202 { ESP_CMD_SELA
, "SLCTATN", },
203 { ESP_CMD_SELAS
, "SLCTATNSTOP", },
204 { ESP_CMD_ESEL
, "ENSLCTRESEL", },
205 { ESP_CMD_DSEL
, "DISSELRESEL", },
206 { ESP_CMD_SA3
, "SLCTATN3", },
207 { ESP_CMD_RSEL3
, "RESLCTSEQ", },
208 /* Target State Group */
209 { ESP_CMD_SMSG
, "SNDMSG", },
210 { ESP_CMD_SSTAT
, "SNDSTATUS", },
211 { ESP_CMD_SDATA
, "SNDDATA", },
212 { ESP_CMD_DSEQ
, "DISCSEQ", },
213 { ESP_CMD_TSEQ
, "TERMSEQ", },
214 { ESP_CMD_TCCSEQ
, "TRGTCMDCOMPSEQ", },
215 { ESP_CMD_DCNCT
, "DISC", },
216 { ESP_CMD_RMSG
, "RCVMSG", },
217 { ESP_CMD_RCMD
, "RCVCMD", },
218 { ESP_CMD_RDATA
, "RCVDATA", },
219 { ESP_CMD_RCSEQ
, "RCVCMDSEQ", },
220 /* Initiator State Group */
221 { ESP_CMD_TI
, "TRANSINFO", },
222 { ESP_CMD_ICCSEQ
, "INICMDSEQCOMP", },
223 { ESP_CMD_MOK
, "MSGACCEPTED", },
224 { ESP_CMD_TPAD
, "TPAD", },
225 { ESP_CMD_SATN
, "SATN", },
226 { ESP_CMD_RATN
, "RATN", },
228 #define NUM_ESP_COMMANDS ((sizeof(esp_cmd_strings)) / (sizeof(struct esp_cmdstrings)))
230 /* Print textual representation of an ESP command */
231 static inline void esp_print_cmd(u8 espcmd
)
233 u8 dma_bit
= espcmd
& ESP_CMD_DMA
;
237 for (i
= 0; i
< NUM_ESP_COMMANDS
; i
++)
238 if (esp_cmd_strings
[i
].cmdchar
== espcmd
)
240 if (i
== NUM_ESP_COMMANDS
)
241 printk("ESP_Unknown");
243 printk("%s%s", esp_cmd_strings
[i
].text
,
244 ((dma_bit
) ? "+DMA" : ""));
247 /* Print the status register's value */
248 static inline void esp_print_statreg(u8 statreg
)
253 phase
= statreg
& ESP_STAT_PMASK
;
254 printk("%s,", (phase
== ESP_DOP
? "DATA-OUT" :
255 (phase
== ESP_DIP
? "DATA-IN" :
256 (phase
== ESP_CMDP
? "COMMAND" :
257 (phase
== ESP_STATP
? "STATUS" :
258 (phase
== ESP_MOP
? "MSG-OUT" :
259 (phase
== ESP_MIP
? "MSG_IN" :
261 if (statreg
& ESP_STAT_TDONE
)
262 printk("TRANS_DONE,");
263 if (statreg
& ESP_STAT_TCNT
)
264 printk("TCOUNT_ZERO,");
265 if (statreg
& ESP_STAT_PERR
)
267 if (statreg
& ESP_STAT_SPAM
)
269 if (statreg
& ESP_STAT_INTR
)
274 /* Print the interrupt register's value */
275 static inline void esp_print_ireg(u8 intreg
)
278 if (intreg
& ESP_INTR_S
)
279 printk("SLCT_NATN ");
280 if (intreg
& ESP_INTR_SATN
)
282 if (intreg
& ESP_INTR_RSEL
)
284 if (intreg
& ESP_INTR_FDONE
)
286 if (intreg
& ESP_INTR_BSERV
)
288 if (intreg
& ESP_INTR_DC
)
290 if (intreg
& ESP_INTR_IC
)
292 if (intreg
& ESP_INTR_SR
)
293 printk("SCSI_BUS_RESET ");
297 /* Print the sequence step registers contents */
298 static inline void esp_print_seqreg(u8 stepreg
)
300 stepreg
&= ESP_STEP_VBITS
;
302 (stepreg
== ESP_STEP_ASEL
? "SLCT_ARB_CMPLT" :
303 (stepreg
== ESP_STEP_SID
? "1BYTE_MSG_SENT" :
304 (stepreg
== ESP_STEP_NCMD
? "NOT_IN_CMD_PHASE" :
305 (stepreg
== ESP_STEP_PPC
? "CMD_BYTES_LOST" :
306 (stepreg
== ESP_STEP_FINI4
? "CMD_SENT_OK" :
310 static char *phase_string(int phase
)
366 #ifdef DEBUG_STATE_MACHINE
367 static inline void esp_advance_phase(struct scsi_cmnd
*s
, int newphase
)
369 ESPLOG(("<%s>", phase_string(newphase
)));
370 s
->SCp
.sent_command
= s
->SCp
.phase
;
371 s
->SCp
.phase
= newphase
;
374 #define esp_advance_phase(__s, __newphase) \
375 (__s)->SCp.sent_command = (__s)->SCp.phase; \
376 (__s)->SCp.phase = (__newphase);
379 #ifdef DEBUG_ESP_CMDS
380 static inline void esp_cmd(struct esp
*esp
, u8 cmd
)
382 esp
->espcmdlog
[esp
->espcmdent
] = cmd
;
383 esp
->espcmdent
= (esp
->espcmdent
+ 1) & 31;
384 sbus_writeb(cmd
, esp
->eregs
+ ESP_CMD
);
387 #define esp_cmd(__esp, __cmd) \
388 sbus_writeb((__cmd), ((__esp)->eregs) + ESP_CMD)
391 #define ESP_INTSOFF(__dregs) \
392 sbus_writel(sbus_readl((__dregs)+DMA_CSR)&~(DMA_INT_ENAB), (__dregs)+DMA_CSR)
393 #define ESP_INTSON(__dregs) \
394 sbus_writel(sbus_readl((__dregs)+DMA_CSR)|DMA_INT_ENAB, (__dregs)+DMA_CSR)
395 #define ESP_IRQ_P(__dregs) \
396 (sbus_readl((__dregs)+DMA_CSR) & (DMA_HNDL_INTR|DMA_HNDL_ERROR))
398 /* How we use the various Linux SCSI data structures for operation.
402 * We keep track of the synchronous capabilities of a target
403 * in the device member, using sync_min_period and
404 * sync_max_offset. These are the values we directly write
405 * into the ESP registers while running a command. If offset
406 * is zero the ESP will use asynchronous transfers.
407 * If the borken flag is set we assume we shouldn't even bother
408 * trying to negotiate for synchronous transfer as this target
409 * is really stupid. If we notice the target is dropping the
410 * bus, and we have been allowing it to disconnect, we clear
411 * the disconnect flag.
415 /* Manipulation of the ESP command queues. Thanks to the aha152x driver
416 * and its author, Juergen E. Fischer, for the methods used here.
417 * Note that these are per-ESP queues, not global queues like
418 * the aha152x driver uses.
420 static inline void append_SC(struct scsi_cmnd
**SC
, struct scsi_cmnd
*new_SC
)
422 struct scsi_cmnd
*end
;
424 new_SC
->host_scribble
= (unsigned char *) NULL
;
428 for (end
=*SC
;end
->host_scribble
;end
=(struct scsi_cmnd
*)end
->host_scribble
)
430 end
->host_scribble
= (unsigned char *) new_SC
;
434 static inline void prepend_SC(struct scsi_cmnd
**SC
, struct scsi_cmnd
*new_SC
)
436 new_SC
->host_scribble
= (unsigned char *) *SC
;
440 static inline struct scsi_cmnd
*remove_first_SC(struct scsi_cmnd
**SC
)
442 struct scsi_cmnd
*ptr
;
445 *SC
= (struct scsi_cmnd
*) (*SC
)->host_scribble
;
449 static inline struct scsi_cmnd
*remove_SC(struct scsi_cmnd
**SC
, int target
, int lun
)
451 struct scsi_cmnd
*ptr
, *prev
;
453 for (ptr
= *SC
, prev
= NULL
;
454 ptr
&& ((ptr
->device
->id
!= target
) || (ptr
->device
->lun
!= lun
));
455 prev
= ptr
, ptr
= (struct scsi_cmnd
*) ptr
->host_scribble
)
459 prev
->host_scribble
=ptr
->host_scribble
;
461 *SC
=(struct scsi_cmnd
*)ptr
->host_scribble
;
466 /* Resetting various pieces of the ESP scsi driver chipset/buses. */
467 static void esp_reset_dma(struct esp
*esp
)
469 int can_do_burst16
, can_do_burst32
, can_do_burst64
;
473 can_do_burst16
= (esp
->bursts
& DMA_BURST16
) != 0;
474 can_do_burst32
= (esp
->bursts
& DMA_BURST32
) != 0;
477 if (sbus_can_dma_64bit(esp
->sdev
))
479 if (sbus_can_burst64(esp
->sdev
))
480 can_do_burst64
= (esp
->bursts
& DMA_BURST64
) != 0;
482 /* Punt the DVMA into a known state. */
483 if (esp
->dma
->revision
!= dvmahme
) {
484 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
485 sbus_writel(tmp
| DMA_RST_SCSI
, esp
->dregs
+ DMA_CSR
);
486 sbus_writel(tmp
& ~DMA_RST_SCSI
, esp
->dregs
+ DMA_CSR
);
488 switch (esp
->dma
->revision
) {
490 /* This is the HME DVMA gate array. */
492 sbus_writel(DMA_RESET_FAS366
, esp
->dregs
+ DMA_CSR
);
493 sbus_writel(DMA_RST_SCSI
, esp
->dregs
+ DMA_CSR
);
495 esp
->prev_hme_dmacsr
= (DMA_PARITY_OFF
|DMA_2CLKS
|DMA_SCSI_DISAB
|DMA_INT_ENAB
);
496 esp
->prev_hme_dmacsr
&= ~(DMA_ENABLE
|DMA_ST_WRITE
|DMA_BRST_SZ
);
499 esp
->prev_hme_dmacsr
|= DMA_BRST64
;
500 else if (can_do_burst32
)
501 esp
->prev_hme_dmacsr
|= DMA_BRST32
;
504 esp
->prev_hme_dmacsr
|= DMA_SCSI_SBUS64
;
505 sbus_set_sbus64(esp
->sdev
, esp
->bursts
);
508 /* This chip is horrible. */
509 while (sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_PEND_READ
)
512 sbus_writel(0, esp
->dregs
+ DMA_CSR
);
513 sbus_writel(esp
->prev_hme_dmacsr
, esp
->dregs
+ DMA_CSR
);
515 /* This is necessary to avoid having the SCSI channel
516 * engine lock up on us.
518 sbus_writel(0, esp
->dregs
+ DMA_ADDR
);
522 /* This is the gate array found in the sun4m
523 * NCR SBUS I/O subsystem.
525 if (esp
->erev
!= esp100
) {
526 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
527 sbus_writel(tmp
| DMA_3CLKS
, esp
->dregs
+ DMA_CSR
);
531 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
534 if (can_do_burst32
) {
538 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
541 /* This is the DMA unit found on SCSI/Ether cards. */
542 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
543 tmp
|= DMA_ADD_ENABLE
;
544 tmp
&= ~DMA_BCNT_ENAB
;
545 if (!can_do_burst32
&& can_do_burst16
) {
546 tmp
|= DMA_ESC_BURST
;
548 tmp
&= ~(DMA_ESC_BURST
);
550 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
555 ESP_INTSON(esp
->dregs
);
558 /* Reset the ESP chip, _not_ the SCSI bus. */
559 static void __init
esp_reset_esp(struct esp
*esp
)
561 u8 family_code
, version
;
564 /* Now reset the ESP chip */
565 esp_cmd(esp
, ESP_CMD_RC
);
566 esp_cmd(esp
, ESP_CMD_NULL
| ESP_CMD_DMA
);
567 esp_cmd(esp
, ESP_CMD_NULL
| ESP_CMD_DMA
);
569 /* Reload the configuration registers */
570 sbus_writeb(esp
->cfact
, esp
->eregs
+ ESP_CFACT
);
572 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
574 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
575 sbus_writeb(esp
->neg_defp
, esp
->eregs
+ ESP_TIMEO
);
577 /* This is the only point at which it is reliable to read
578 * the ID-code for a fast ESP chip variants.
580 esp
->max_period
= ((35 * esp
->ccycle
) / 1000);
581 if (esp
->erev
== fast
) {
582 version
= sbus_readb(esp
->eregs
+ ESP_UID
);
583 family_code
= (version
& 0xf8) >> 3;
584 if (family_code
== 0x02)
586 else if (family_code
== 0x0a)
587 esp
->erev
= fashme
; /* Version is usually '5'. */
590 ESPMISC(("esp%d: FAST chip is %s (family=%d, version=%d)\n",
592 (esp
->erev
== fas236
) ? "fas236" :
593 ((esp
->erev
== fas100a
) ? "fas100a" :
594 "fasHME"), family_code
, (version
& 7)));
596 esp
->min_period
= ((4 * esp
->ccycle
) / 1000);
598 esp
->min_period
= ((5 * esp
->ccycle
) / 1000);
600 esp
->max_period
= (esp
->max_period
+ 3)>>2;
601 esp
->min_period
= (esp
->min_period
+ 3)>>2;
603 sbus_writeb(esp
->config1
, esp
->eregs
+ ESP_CFG1
);
609 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
613 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
614 esp
->prev_cfg3
= esp
->config3
[0];
615 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
618 esp
->config2
|= (ESP_CONFIG2_HME32
| ESP_CONFIG2_HMEFENAB
);
621 /* Fast 236 or HME */
622 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
623 for (i
= 0; i
< 16; i
++) {
624 if (esp
->erev
== fashme
) {
627 cfg3
= ESP_CONFIG3_FCLOCK
| ESP_CONFIG3_OBPUSH
;
628 if (esp
->scsi_id
>= 8)
629 cfg3
|= ESP_CONFIG3_IDBIT3
;
630 esp
->config3
[i
] |= cfg3
;
632 esp
->config3
[i
] |= ESP_CONFIG3_FCLK
;
635 esp
->prev_cfg3
= esp
->config3
[0];
636 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
637 if (esp
->erev
== fashme
) {
648 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
649 for (i
= 0; i
< 16; i
++)
650 esp
->config3
[i
] |= ESP_CONFIG3_FCLOCK
;
651 esp
->prev_cfg3
= esp
->config3
[0];
652 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
656 panic("esp: what could it be... I wonder...");
660 /* Eat any bitrot in the chip */
661 sbus_readb(esp
->eregs
+ ESP_INTRPT
);
665 /* This places the ESP into a known state at boot time. */
666 static void __init
esp_bootup_reset(struct esp
*esp
)
676 /* Reset the SCSI bus, but tell ESP not to generate an irq */
677 tmp
= sbus_readb(esp
->eregs
+ ESP_CFG1
);
678 tmp
|= ESP_CONFIG1_SRRDISAB
;
679 sbus_writeb(tmp
, esp
->eregs
+ ESP_CFG1
);
681 esp_cmd(esp
, ESP_CMD_RS
);
684 sbus_writeb(esp
->config1
, esp
->eregs
+ ESP_CFG1
);
686 /* Eat any bitrot in the chip and we are done... */
687 sbus_readb(esp
->eregs
+ ESP_INTRPT
);
690 static int __init
esp_find_dvma(struct esp
*esp
, struct sbus_dev
*dma_sdev
)
692 struct sbus_dev
*sdev
= esp
->sdev
;
693 struct sbus_dma
*dma
;
695 if (dma_sdev
!= NULL
) {
697 if (dma
->sdev
== dma_sdev
)
702 /* If allocated already, can't use it. */
706 if (dma
->sdev
== NULL
)
709 /* If bus + slot are the same and it has the
710 * correct OBP name, it's ours.
712 if (sdev
->bus
== dma
->sdev
->bus
&&
713 sdev
->slot
== dma
->sdev
->slot
&&
714 (!strcmp(dma
->sdev
->prom_name
, "dma") ||
715 !strcmp(dma
->sdev
->prom_name
, "espdma")))
720 /* If we don't know how to handle the dvma,
721 * do not use this device.
724 printk("Cannot find dvma for ESP%d's SCSI\n", esp
->esp_id
);
727 if (dma
->allocated
) {
728 printk("esp%d: can't use my espdma\n", esp
->esp_id
);
733 esp
->dregs
= dma
->regs
;
738 static int __init
esp_map_regs(struct esp
*esp
, int hme
)
740 struct sbus_dev
*sdev
= esp
->sdev
;
741 struct resource
*res
;
743 /* On HME, two reg sets exist, first is DVMA,
744 * second is ESP registers.
747 res
= &sdev
->resource
[1];
749 res
= &sdev
->resource
[0];
751 esp
->eregs
= sbus_ioremap(res
, 0, ESP_REG_SIZE
, "ESP Registers");
758 static int __init
esp_map_cmdarea(struct esp
*esp
)
760 struct sbus_dev
*sdev
= esp
->sdev
;
762 esp
->esp_command
= sbus_alloc_consistent(sdev
, 16,
763 &esp
->esp_command_dvma
);
764 if (esp
->esp_command
== NULL
||
765 esp
->esp_command_dvma
== 0)
770 static int __init
esp_register_irq(struct esp
*esp
)
772 esp
->ehost
->irq
= esp
->irq
= esp
->sdev
->irqs
[0];
774 /* We used to try various overly-clever things to
775 * reduce the interrupt processing overhead on
776 * sun4c/sun4m when multiple ESP's shared the
777 * same IRQ. It was too complex and messy to
780 if (request_irq(esp
->ehost
->irq
, esp_intr
,
781 IRQF_SHARED
, "ESP SCSI", esp
)) {
782 printk("esp%d: Cannot acquire irq line\n",
787 printk("esp%d: IRQ %d ", esp
->esp_id
,
793 static void __init
esp_get_scsi_id(struct esp
*esp
)
795 struct sbus_dev
*sdev
= esp
->sdev
;
796 struct device_node
*dp
= sdev
->ofdev
.node
;
798 esp
->scsi_id
= of_getintprop_default(dp
,
801 if (esp
->scsi_id
== -1)
802 esp
->scsi_id
= of_getintprop_default(dp
,
805 if (esp
->scsi_id
== -1)
806 esp
->scsi_id
= (sdev
->bus
== NULL
) ? 7 :
807 of_getintprop_default(sdev
->bus
->ofdev
.node
,
810 esp
->ehost
->this_id
= esp
->scsi_id
;
811 esp
->scsi_id_mask
= (1 << esp
->scsi_id
);
815 static void __init
esp_get_clock_params(struct esp
*esp
)
817 struct sbus_dev
*sdev
= esp
->sdev
;
818 int prom_node
= esp
->prom_node
;
823 if (sdev
!= NULL
&& sdev
->bus
!= NULL
)
824 sbus_prom_node
= sdev
->bus
->prom_node
;
828 /* This is getting messy but it has to be done
829 * correctly or else you get weird behavior all
830 * over the place. We are trying to basically
831 * figure out three pieces of information.
833 * a) Clock Conversion Factor
835 * This is a representation of the input
836 * crystal clock frequency going into the
837 * ESP on this machine. Any operation whose
838 * timing is longer than 400ns depends on this
839 * value being correct. For example, you'll
840 * get blips for arbitration/selection during
841 * high load or with multiple targets if this
842 * is not set correctly.
844 * b) Selection Time-Out
846 * The ESP isn't very bright and will arbitrate
847 * for the bus and try to select a target
848 * forever if you let it. This value tells
849 * the ESP when it has taken too long to
850 * negotiate and that it should interrupt
851 * the CPU so we can see what happened.
852 * The value is computed as follows (from
853 * NCR/Symbios chip docs).
855 * (Time Out Period) * (Input Clock)
856 * STO = ----------------------------------
857 * (8192) * (Clock Conversion Factor)
859 * You usually want the time out period to be
860 * around 250ms, I think we'll set it a little
861 * bit higher to account for fully loaded SCSI
862 * bus's and slow devices that don't respond so
863 * quickly to selection attempts. (yeah, I know
864 * this is out of spec. but there is a lot of
865 * buggy pieces of firmware out there so bite me)
867 * c) Imperical constants for synchronous offset
868 * and transfer period register values
870 * This entails the smallest and largest sync
871 * period we could ever handle on this ESP.
874 fmhz
= prom_getintdefault(prom_node
, "clock-frequency", -1);
876 fmhz
= (!sbus_prom_node
) ? 0 :
877 prom_getintdefault(sbus_prom_node
, "clock-frequency", -1);
879 if (fmhz
<= (5000000))
882 ccf
= (((5000000 - 1) + (fmhz
))/(5000000));
884 if (!ccf
|| ccf
> 8) {
885 /* If we can't find anything reasonable,
886 * just assume 20MHZ. This is the clock
887 * frequency of the older sun4c's where I've
888 * been unable to find the clock-frequency
889 * PROM property. All other machines provide
890 * useful values it seems.
896 if (ccf
== (ESP_CCF_F7
+ 1))
897 esp
->cfact
= ESP_CCF_F0
;
898 else if (ccf
== ESP_CCF_NEVER
)
899 esp
->cfact
= ESP_CCF_F2
;
902 esp
->raw_cfact
= ccf
;
905 esp
->ccycle
= ESP_MHZ_TO_CYCLE(fmhz
);
906 esp
->ctick
= ESP_TICK(ccf
, esp
->ccycle
);
907 esp
->neg_defp
= ESP_NEG_DEFP(fmhz
, ccf
);
908 esp
->sync_defp
= SYNC_DEFP_SLOW
;
910 printk("SCSI ID %d Clk %dMHz CCYC=%d CCF=%d TOut %d ",
911 esp
->scsi_id
, (fmhz
/ 1000000),
912 (int)esp
->ccycle
, (int)ccf
, (int) esp
->neg_defp
);
915 static void __init
esp_get_bursts(struct esp
*esp
, struct sbus_dev
*dma
)
917 struct sbus_dev
*sdev
= esp
->sdev
;
920 bursts
= prom_getintdefault(esp
->prom_node
, "burst-sizes", 0xff);
923 u8 tmp
= prom_getintdefault(dma
->prom_node
,
924 "burst-sizes", 0xff);
930 u8 tmp
= prom_getintdefault(sdev
->bus
->prom_node
,
931 "burst-sizes", 0xff);
936 if (bursts
== 0xff ||
937 (bursts
& DMA_BURST16
) == 0 ||
938 (bursts
& DMA_BURST32
) == 0)
939 bursts
= (DMA_BURST32
- 1);
941 esp
->bursts
= bursts
;
944 static void __init
esp_get_revision(struct esp
*esp
)
948 esp
->config1
= (ESP_CONFIG1_PENABLE
| (esp
->scsi_id
& 7));
949 esp
->config2
= (ESP_CONFIG2_SCSI2ENAB
| ESP_CONFIG2_REGPARITY
);
950 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
952 tmp
= sbus_readb(esp
->eregs
+ ESP_CFG2
);
953 tmp
&= ~ESP_CONFIG2_MAGIC
;
954 if (tmp
!= (ESP_CONFIG2_SCSI2ENAB
| ESP_CONFIG2_REGPARITY
)) {
955 /* If what we write to cfg2 does not come back, cfg2
956 * is not implemented, therefore this must be a plain
960 printk("NCR53C90(esp100)\n");
963 esp
->prev_cfg3
= esp
->config3
[0] = 5;
964 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
965 sbus_writeb(0, esp
->eregs
+ ESP_CFG3
);
966 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
968 tmp
= sbus_readb(esp
->eregs
+ ESP_CFG3
);
970 /* The cfg2 register is implemented, however
971 * cfg3 is not, must be esp100a.
974 printk("NCR53C90A(esp100a)\n");
978 for (target
= 0; target
< 16; target
++)
979 esp
->config3
[target
] = 0;
981 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
983 /* All of cfg{1,2,3} implemented, must be one of
984 * the fas variants, figure out which one.
986 if (esp
->raw_cfact
> ESP_CCF_F5
) {
988 esp
->sync_defp
= SYNC_DEFP_FAST
;
989 printk("NCR53C9XF(espfast)\n");
992 printk("NCR53C9x(esp236)\n");
995 sbus_writeb(esp
->config2
, esp
->eregs
+ ESP_CFG2
);
1000 static void __init
esp_init_swstate(struct esp
*esp
)
1004 /* Command queues... */
1005 esp
->current_SC
= NULL
;
1006 esp
->disconnected_SC
= NULL
;
1007 esp
->issue_SC
= NULL
;
1009 /* Target and current command state... */
1010 esp
->targets_present
= 0;
1011 esp
->resetting_bus
= 0;
1014 init_waitqueue_head(&esp
->reset_queue
);
1017 for(i
= 0; i
< 32; i
++)
1018 esp
->espcmdlog
[i
] = 0;
1021 /* MSG phase state... */
1022 for(i
= 0; i
< 16; i
++) {
1023 esp
->cur_msgout
[i
] = 0;
1024 esp
->cur_msgin
[i
] = 0;
1026 esp
->prevmsgout
= esp
->prevmsgin
= 0;
1027 esp
->msgout_len
= esp
->msgin_len
= 0;
1029 /* Clear the one behind caches to hold unmatchable values. */
1030 esp
->prev_soff
= esp
->prev_stp
= esp
->prev_cfg3
= 0xff;
1031 esp
->prev_hme_dmacsr
= 0xffffffff;
1034 static int __init
detect_one_esp(struct scsi_host_template
*tpnt
,
1036 struct sbus_dev
*esp_dev
,
1037 struct sbus_dev
*espdma
,
1038 struct sbus_bus
*sbus
,
1041 static int instance
;
1042 struct Scsi_Host
*esp_host
= scsi_host_alloc(tpnt
, sizeof(struct esp
));
1049 esp_host
->max_id
= 16;
1050 esp
= (struct esp
*) esp_host
->hostdata
;
1051 esp
->ehost
= esp_host
;
1052 esp
->sdev
= esp_dev
;
1053 esp
->esp_id
= instance
;
1054 esp
->prom_node
= esp_dev
->prom_node
;
1055 prom_getstring(esp
->prom_node
, "name", esp
->prom_name
,
1056 sizeof(esp
->prom_name
));
1058 if (esp_find_dvma(esp
, espdma
) < 0)
1060 if (esp_map_regs(esp
, hme
) < 0) {
1061 printk("ESP registers unmappable");
1062 goto fail_dvma_release
;
1064 if (esp_map_cmdarea(esp
) < 0) {
1065 printk("ESP DVMA transport area unmappable");
1066 goto fail_unmap_regs
;
1068 if (esp_register_irq(esp
) < 0)
1069 goto fail_unmap_cmdarea
;
1071 esp_get_scsi_id(esp
);
1073 esp
->diff
= prom_getbool(esp
->prom_node
, "differential");
1075 printk("Differential ");
1077 esp_get_clock_params(esp
);
1078 esp_get_bursts(esp
, espdma
);
1079 esp_get_revision(esp
);
1080 esp_init_swstate(esp
);
1082 esp_bootup_reset(esp
);
1084 if (scsi_add_host(esp_host
, dev
))
1087 dev_set_drvdata(&esp_dev
->ofdev
.dev
, esp
);
1089 scsi_scan_host(esp_host
);
1095 free_irq(esp
->ehost
->irq
, esp
);
1098 sbus_free_consistent(esp
->sdev
, 16,
1099 (void *) esp
->esp_command
,
1100 esp
->esp_command_dvma
);
1103 sbus_iounmap(esp
->eregs
, ESP_REG_SIZE
);
1106 esp
->dma
->allocated
= 0;
1109 scsi_host_put(esp_host
);
1113 /* Detecting ESP chips on the machine. This is the simple and easy
1116 static int __devexit
esp_remove_common(struct esp
*esp
)
1118 unsigned int irq
= esp
->ehost
->irq
;
1120 scsi_remove_host(esp
->ehost
);
1122 ESP_INTSOFF(esp
->dregs
);
1129 sbus_free_consistent(esp
->sdev
, 16,
1130 (void *) esp
->esp_command
, esp
->esp_command_dvma
);
1131 sbus_iounmap(esp
->eregs
, ESP_REG_SIZE
);
1132 esp
->dma
->allocated
= 0;
1134 scsi_host_put(esp
->ehost
);
1142 #include <asm/sun4paddr.h>
1144 static struct sbus_dev sun4_esp_dev
;
1146 static int __init
esp_sun4_probe(struct scsi_host_template
*tpnt
)
1148 if (sun4_esp_physaddr
) {
1149 memset(&sun4_esp_dev
, 0, sizeof(esp_dev
));
1150 sun4_esp_dev
.reg_addrs
[0].phys_addr
= sun4_esp_physaddr
;
1151 sun4_esp_dev
.irqs
[0] = 4;
1152 sun4_esp_dev
.resource
[0].start
= sun4_esp_physaddr
;
1153 sun4_esp_dev
.resource
[0].end
=
1154 sun4_esp_physaddr
+ ESP_REG_SIZE
- 1;
1155 sun4_esp_dev
.resource
[0].flags
= IORESOURCE_IO
;
1157 return detect_one_esp(tpnt
, NULL
,
1158 &sun4_esp_dev
, NULL
, NULL
, 0);
1163 static int __devexit
esp_sun4_remove(void)
1165 struct esp
*esp
= dev_get_drvdata(&dev
->dev
);
1167 return esp_remove_common(esp
);
1170 #else /* !CONFIG_SUN4 */
1172 static int __devinit
esp_sbus_probe(struct of_device
*dev
, const struct of_device_id
*match
)
1174 struct sbus_dev
*sdev
= to_sbus_device(&dev
->dev
);
1175 struct device_node
*dp
= dev
->node
;
1176 struct sbus_dev
*dma_sdev
= NULL
;
1180 (!strcmp(dp
->parent
->name
, "espdma") ||
1181 !strcmp(dp
->parent
->name
, "dma")))
1182 dma_sdev
= sdev
->parent
;
1183 else if (!strcmp(dp
->name
, "SUNW,fas")) {
1188 return detect_one_esp(match
->data
, &dev
->dev
,
1189 sdev
, dma_sdev
, sdev
->bus
, hme
);
1192 static int __devexit
esp_sbus_remove(struct of_device
*dev
)
1194 struct esp
*esp
= dev_get_drvdata(&dev
->dev
);
1196 return esp_remove_common(esp
);
1199 #endif /* !CONFIG_SUN4 */
1201 /* The info function will return whatever useful
1202 * information the developer sees fit. If not provided, then
1203 * the name field will be used instead.
1205 static const char *esp_info(struct Scsi_Host
*host
)
1209 esp
= (struct esp
*) host
->hostdata
;
1210 switch (esp
->erev
) {
1212 return "Sparc ESP100 (NCR53C90)";
1214 return "Sparc ESP100A (NCR53C90A)";
1216 return "Sparc ESP236";
1218 return "Sparc ESP236-FAST";
1220 return "Sparc ESP366-HME";
1222 return "Sparc ESP100A-FAST";
1224 return "Bogon ESP revision";
1228 /* From Wolfgang Stanglmeier's NCR scsi driver. */
1237 static void copy_mem_info(struct info_str
*info
, char *data
, int len
)
1239 if (info
->pos
+ len
> info
->length
)
1240 len
= info
->length
- info
->pos
;
1242 if (info
->pos
+ len
< info
->offset
) {
1246 if (info
->pos
< info
->offset
) {
1247 data
+= (info
->offset
- info
->pos
);
1248 len
-= (info
->offset
- info
->pos
);
1252 memcpy(info
->buffer
+ info
->pos
, data
, len
);
1257 static int copy_info(struct info_str
*info
, char *fmt
, ...)
1263 va_start(args
, fmt
);
1264 len
= vsprintf(buf
, fmt
, args
);
1267 copy_mem_info(info
, buf
, len
);
1271 static int esp_host_info(struct esp
*esp
, char *ptr
, off_t offset
, int len
)
1273 struct scsi_device
*sdev
;
1274 struct info_str info
;
1279 info
.offset
= offset
;
1282 copy_info(&info
, "Sparc ESP Host Adapter:\n");
1283 copy_info(&info
, "\tPROM node\t\t%08x\n", (unsigned int) esp
->prom_node
);
1284 copy_info(&info
, "\tPROM name\t\t%s\n", esp
->prom_name
);
1285 copy_info(&info
, "\tESP Model\t\t");
1286 switch (esp
->erev
) {
1288 copy_info(&info
, "ESP100\n");
1291 copy_info(&info
, "ESP100A\n");
1294 copy_info(&info
, "ESP236\n");
1297 copy_info(&info
, "FAS236\n");
1300 copy_info(&info
, "FAS100A\n");
1303 copy_info(&info
, "FAST\n");
1306 copy_info(&info
, "Happy Meal FAS\n");
1310 copy_info(&info
, "Unknown!\n");
1313 copy_info(&info
, "\tDMA Revision\t\t");
1314 switch (esp
->dma
->revision
) {
1316 copy_info(&info
, "Rev 0\n");
1319 copy_info(&info
, "ESC Rev 1\n");
1322 copy_info(&info
, "Rev 1\n");
1325 copy_info(&info
, "Rev 2\n");
1328 copy_info(&info
, "Rev 3\n");
1331 copy_info(&info
, "Rev 1+\n");
1334 copy_info(&info
, "Rev HME/FAS\n");
1337 copy_info(&info
, "Unknown!\n");
1340 copy_info(&info
, "\tLive Targets\t\t[ ");
1341 for (i
= 0; i
< 15; i
++) {
1342 if (esp
->targets_present
& (1 << i
))
1343 copy_info(&info
, "%d ", i
);
1345 copy_info(&info
, "]\n\n");
1347 /* Now describe the state of each existing target. */
1348 copy_info(&info
, "Target #\tconfig3\t\tSync Capabilities\tDisconnect\tWide\n");
1350 shost_for_each_device(sdev
, esp
->ehost
) {
1351 struct esp_device
*esp_dev
= sdev
->hostdata
;
1354 if (!(esp
->targets_present
& (1 << id
)))
1357 copy_info(&info
, "%d\t\t", id
);
1358 copy_info(&info
, "%08lx\t", esp
->config3
[id
]);
1359 copy_info(&info
, "[%02lx,%02lx]\t\t\t",
1360 esp_dev
->sync_max_offset
,
1361 esp_dev
->sync_min_period
);
1362 copy_info(&info
, "%s\t\t",
1363 esp_dev
->disconnect
? "yes" : "no");
1364 copy_info(&info
, "%s\n",
1365 (esp
->config3
[id
] & ESP_CONFIG3_EWIDE
) ? "yes" : "no");
1367 return info
.pos
> info
.offset
? info
.pos
- info
.offset
: 0;
1370 /* ESP proc filesystem code. */
1371 static int esp_proc_info(struct Scsi_Host
*host
, char *buffer
, char **start
, off_t offset
,
1372 int length
, int inout
)
1374 struct esp
*esp
= (struct esp
*) host
->hostdata
;
1377 return -EINVAL
; /* not yet */
1382 return esp_host_info(esp
, buffer
, offset
, length
);
1385 static void esp_get_dmabufs(struct esp
*esp
, struct scsi_cmnd
*sp
)
1387 if (sp
->use_sg
== 0) {
1388 sp
->SCp
.this_residual
= sp
->request_bufflen
;
1389 sp
->SCp
.buffer
= (struct scatterlist
*) sp
->request_buffer
;
1390 sp
->SCp
.buffers_residual
= 0;
1391 if (sp
->request_bufflen
) {
1392 sp
->SCp
.have_data_in
= sbus_map_single(esp
->sdev
, sp
->SCp
.buffer
,
1393 sp
->SCp
.this_residual
,
1394 sp
->sc_data_direction
);
1395 sp
->SCp
.ptr
= (char *) ((unsigned long)sp
->SCp
.have_data_in
);
1400 sp
->SCp
.buffer
= (struct scatterlist
*) sp
->buffer
;
1401 sp
->SCp
.buffers_residual
= sbus_map_sg(esp
->sdev
,
1404 sp
->sc_data_direction
);
1405 sp
->SCp
.this_residual
= sg_dma_len(sp
->SCp
.buffer
);
1406 sp
->SCp
.ptr
= (char *) ((unsigned long)sg_dma_address(sp
->SCp
.buffer
));
1410 static void esp_release_dmabufs(struct esp
*esp
, struct scsi_cmnd
*sp
)
1413 sbus_unmap_sg(esp
->sdev
, sp
->buffer
, sp
->use_sg
,
1414 sp
->sc_data_direction
);
1415 } else if (sp
->request_bufflen
) {
1416 sbus_unmap_single(esp
->sdev
,
1417 sp
->SCp
.have_data_in
,
1418 sp
->request_bufflen
,
1419 sp
->sc_data_direction
);
1423 static void esp_restore_pointers(struct esp
*esp
, struct scsi_cmnd
*sp
)
1425 struct esp_pointers
*ep
= &esp
->data_pointers
[sp
->device
->id
];
1427 sp
->SCp
.ptr
= ep
->saved_ptr
;
1428 sp
->SCp
.buffer
= ep
->saved_buffer
;
1429 sp
->SCp
.this_residual
= ep
->saved_this_residual
;
1430 sp
->SCp
.buffers_residual
= ep
->saved_buffers_residual
;
1433 static void esp_save_pointers(struct esp
*esp
, struct scsi_cmnd
*sp
)
1435 struct esp_pointers
*ep
= &esp
->data_pointers
[sp
->device
->id
];
1437 ep
->saved_ptr
= sp
->SCp
.ptr
;
1438 ep
->saved_buffer
= sp
->SCp
.buffer
;
1439 ep
->saved_this_residual
= sp
->SCp
.this_residual
;
1440 ep
->saved_buffers_residual
= sp
->SCp
.buffers_residual
;
1445 * 1) Never ever panic while something is live on the bus.
1446 * If there is to be any chance of syncing the disks this
1447 * rule is to be obeyed.
1449 * 2) Any target that causes a foul condition will no longer
1450 * have synchronous transfers done to it, no questions
1453 * 3) Keep register accesses to a minimum. Think about some
1454 * day when we have Xbus machines this is running on and
1455 * the ESP chip is on the other end of the machine on a
1456 * different board from the cpu where this is running.
1459 /* Fire off a command. We assume the bus is free and that the only
1460 * case where we could see an interrupt is where we have disconnected
1461 * commands active and they are trying to reselect us.
1463 static inline void esp_check_cmd(struct esp
*esp
, struct scsi_cmnd
*sp
)
1465 switch (sp
->cmd_len
) {
1469 esp
->esp_slowcmd
= 0;
1473 esp
->esp_slowcmd
= 1;
1474 esp
->esp_scmdleft
= sp
->cmd_len
;
1475 esp
->esp_scmdp
= &sp
->cmnd
[0];
1480 static inline void build_sync_nego_msg(struct esp
*esp
, int period
, int offset
)
1482 esp
->cur_msgout
[0] = EXTENDED_MESSAGE
;
1483 esp
->cur_msgout
[1] = 3;
1484 esp
->cur_msgout
[2] = EXTENDED_SDTR
;
1485 esp
->cur_msgout
[3] = period
;
1486 esp
->cur_msgout
[4] = offset
;
1487 esp
->msgout_len
= 5;
1490 /* SIZE is in bits, currently HME only supports 16 bit wide transfers. */
1491 static inline void build_wide_nego_msg(struct esp
*esp
, int size
)
1493 esp
->cur_msgout
[0] = EXTENDED_MESSAGE
;
1494 esp
->cur_msgout
[1] = 2;
1495 esp
->cur_msgout
[2] = EXTENDED_WDTR
;
1498 esp
->cur_msgout
[3] = 2;
1501 esp
->cur_msgout
[3] = 1;
1505 esp
->cur_msgout
[3] = 0;
1509 esp
->msgout_len
= 4;
1512 static void esp_exec_cmd(struct esp
*esp
)
1514 struct scsi_cmnd
*SCptr
;
1515 struct scsi_device
*SDptr
;
1516 struct esp_device
*esp_dev
;
1517 volatile u8
*cmdp
= esp
->esp_command
;
1522 /* Hold off if we have disconnected commands and
1523 * an IRQ is showing...
1525 if (esp
->disconnected_SC
&& ESP_IRQ_P(esp
->dregs
))
1528 /* Grab first member of the issue queue. */
1529 SCptr
= esp
->current_SC
= remove_first_SC(&esp
->issue_SC
);
1531 /* Safe to panic here because current_SC is null. */
1533 panic("esp: esp_exec_cmd and issue queue is NULL");
1535 SDptr
= SCptr
->device
;
1536 esp_dev
= SDptr
->hostdata
;
1537 lun
= SCptr
->device
->lun
;
1538 target
= SCptr
->device
->id
;
1541 esp
->msgout_len
= 0;
1543 /* Send it out whole, or piece by piece? The ESP
1544 * only knows how to automatically send out 6, 10,
1545 * and 12 byte commands. I used to think that the
1546 * Linux SCSI code would never throw anything other
1547 * than that to us, but then again there is the
1548 * SCSI generic driver which can send us anything.
1550 esp_check_cmd(esp
, SCptr
);
1552 /* If arbitration/selection is successful, the ESP will leave
1553 * ATN asserted, causing the target to go into message out
1554 * phase. The ESP will feed the target the identify and then
1555 * the target can only legally go to one of command,
1556 * datain/out, status, or message in phase, or stay in message
1557 * out phase (should we be trying to send a sync negotiation
1558 * message after the identify). It is not allowed to drop
1559 * BSY, but some buggy targets do and we check for this
1560 * condition in the selection complete code. Most of the time
1561 * we'll make the command bytes available to the ESP and it
1562 * will not interrupt us until it finishes command phase, we
1563 * cannot do this for command sizes the ESP does not
1564 * understand and in this case we'll get interrupted right
1565 * when the target goes into command phase.
1567 * It is absolutely _illegal_ in the presence of SCSI-2 devices
1568 * to use the ESP select w/o ATN command. When SCSI-2 devices are
1569 * present on the bus we _must_ always go straight to message out
1570 * phase with an identify message for the target. Being that
1571 * selection attempts in SCSI-1 w/o ATN was an option, doing SCSI-2
1572 * selections should not confuse SCSI-1 we hope.
1575 if (esp_dev
->sync
) {
1576 /* this targets sync is known */
1577 #ifndef __sparc_v9__
1580 if (esp_dev
->disconnect
)
1581 *cmdp
++ = IDENTIFY(1, lun
);
1583 *cmdp
++ = IDENTIFY(0, lun
);
1585 if (esp
->esp_slowcmd
) {
1586 the_esp_command
= (ESP_CMD_SELAS
| ESP_CMD_DMA
);
1587 esp_advance_phase(SCptr
, in_slct_stop
);
1589 the_esp_command
= (ESP_CMD_SELA
| ESP_CMD_DMA
);
1590 esp_advance_phase(SCptr
, in_slct_norm
);
1592 } else if (!(esp
->targets_present
& (1<<target
)) || !(esp_dev
->disconnect
)) {
1593 /* After the bootup SCSI code sends both the
1594 * TEST_UNIT_READY and INQUIRY commands we want
1595 * to at least attempt allowing the device to
1598 ESPMISC(("esp: Selecting device for first time. target=%d "
1599 "lun=%d\n", target
, SCptr
->device
->lun
));
1600 if (!SDptr
->borken
&& !esp_dev
->disconnect
)
1601 esp_dev
->disconnect
= 1;
1603 *cmdp
++ = IDENTIFY(0, lun
);
1604 esp
->prevmsgout
= NOP
;
1605 esp_advance_phase(SCptr
, in_slct_norm
);
1606 the_esp_command
= (ESP_CMD_SELA
| ESP_CMD_DMA
);
1608 /* Take no chances... */
1609 esp_dev
->sync_max_offset
= 0;
1610 esp_dev
->sync_min_period
= 0;
1612 /* Sorry, I have had way too many problems with
1613 * various CDROM devices on ESP. -DaveM
1615 int cdrom_hwbug_wkaround
= 0;
1617 #ifndef __sparc_v9__
1618 /* Never allow disconnects or synchronous transfers on
1619 * SparcStation1 and SparcStation1+. Allowing those
1620 * to be enabled seems to lockup the machine completely.
1622 if ((idprom
->id_machtype
== (SM_SUN4C
| SM_4C_SS1
)) ||
1623 (idprom
->id_machtype
== (SM_SUN4C
| SM_4C_SS1PLUS
))) {
1624 /* But we are nice and allow tapes and removable
1625 * disks (but not CDROMs) to disconnect.
1627 if(SDptr
->type
== TYPE_TAPE
||
1628 (SDptr
->type
!= TYPE_ROM
&& SDptr
->removable
))
1629 esp_dev
->disconnect
= 1;
1631 esp_dev
->disconnect
= 0;
1632 esp_dev
->sync_max_offset
= 0;
1633 esp_dev
->sync_min_period
= 0;
1638 #endif /* !(__sparc_v9__) */
1640 /* We've talked to this guy before,
1641 * but never negotiated. Let's try,
1642 * need to attempt WIDE first, before
1643 * sync nego, as per SCSI 2 standard.
1645 if (esp
->erev
== fashme
&& !esp_dev
->wide
) {
1646 if (!SDptr
->borken
&&
1647 SDptr
->type
!= TYPE_ROM
&&
1648 SDptr
->removable
== 0) {
1649 build_wide_nego_msg(esp
, 16);
1652 goto after_nego_msg_built
;
1655 /* Fall through and try sync. */
1659 if (!SDptr
->borken
) {
1660 if ((SDptr
->type
== TYPE_ROM
)) {
1661 /* Nice try sucker... */
1662 ESPMISC(("esp%d: Disabling sync for buggy "
1663 "CDROM.\n", esp
->esp_id
));
1664 cdrom_hwbug_wkaround
= 1;
1665 build_sync_nego_msg(esp
, 0, 0);
1666 } else if (SDptr
->removable
!= 0) {
1667 ESPMISC(("esp%d: Not negotiating sync/wide but "
1668 "allowing disconnect for removable media.\n",
1670 build_sync_nego_msg(esp
, 0, 0);
1672 build_sync_nego_msg(esp
, esp
->sync_defp
, 15);
1675 build_sync_nego_msg(esp
, 0, 0);
1680 after_nego_msg_built
:
1681 /* A fix for broken SCSI1 targets, when they disconnect
1682 * they lock up the bus and confuse ESP. So disallow
1683 * disconnects for SCSI1 targets for now until we
1684 * find a better fix.
1686 * Addendum: This is funny, I figured out what was going
1687 * on. The blotzed SCSI1 target would disconnect,
1688 * one of the other SCSI2 targets or both would be
1689 * disconnected as well. The SCSI1 target would
1690 * stay disconnected long enough that we start
1691 * up a command on one of the SCSI2 targets. As
1692 * the ESP is arbitrating for the bus the SCSI1
1693 * target begins to arbitrate as well to reselect
1694 * the ESP. The SCSI1 target refuses to drop it's
1695 * ID bit on the data bus even though the ESP is
1696 * at ID 7 and is the obvious winner for any
1697 * arbitration. The ESP is a poor sport and refuses
1698 * to lose arbitration, it will continue indefinitely
1699 * trying to arbitrate for the bus and can only be
1700 * stopped via a chip reset or SCSI bus reset.
1701 * Therefore _no_ disconnects for SCSI1 targets
1702 * thank you very much. ;-)
1704 if(((SDptr
->scsi_level
< 3) &&
1705 (SDptr
->type
!= TYPE_TAPE
) &&
1706 SDptr
->removable
== 0) ||
1707 cdrom_hwbug_wkaround
|| SDptr
->borken
) {
1708 ESPMISC((KERN_INFO
"esp%d: Disabling DISCONNECT for target %d "
1709 "lun %d\n", esp
->esp_id
, SCptr
->device
->id
, SCptr
->device
->lun
));
1710 esp_dev
->disconnect
= 0;
1711 *cmdp
++ = IDENTIFY(0, lun
);
1713 *cmdp
++ = IDENTIFY(1, lun
);
1716 /* ESP fifo is only so big...
1717 * Make this look like a slow command.
1719 esp
->esp_slowcmd
= 1;
1720 esp
->esp_scmdleft
= SCptr
->cmd_len
;
1721 esp
->esp_scmdp
= &SCptr
->cmnd
[0];
1723 the_esp_command
= (ESP_CMD_SELAS
| ESP_CMD_DMA
);
1724 esp_advance_phase(SCptr
, in_slct_msg
);
1727 if (!esp
->esp_slowcmd
)
1728 for (i
= 0; i
< SCptr
->cmd_len
; i
++)
1729 *cmdp
++ = SCptr
->cmnd
[i
];
1732 if (esp
->erev
== fashme
)
1733 sbus_writeb((target
& 0xf) | (ESP_BUSID_RESELID
| ESP_BUSID_CTR32BIT
),
1734 esp
->eregs
+ ESP_BUSID
);
1736 sbus_writeb(target
& 7, esp
->eregs
+ ESP_BUSID
);
1737 if (esp
->prev_soff
!= esp_dev
->sync_max_offset
||
1738 esp
->prev_stp
!= esp_dev
->sync_min_period
||
1739 (esp
->erev
> esp100a
&&
1740 esp
->prev_cfg3
!= esp
->config3
[target
])) {
1741 esp
->prev_soff
= esp_dev
->sync_max_offset
;
1742 esp
->prev_stp
= esp_dev
->sync_min_period
;
1743 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
1744 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
1745 if (esp
->erev
> esp100a
) {
1746 esp
->prev_cfg3
= esp
->config3
[target
];
1747 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
1750 i
= (cmdp
- esp
->esp_command
);
1752 if (esp
->erev
== fashme
) {
1753 esp_cmd(esp
, ESP_CMD_FLUSH
); /* Grrr! */
1755 /* Set up the DMA and HME counters */
1756 sbus_writeb(i
, esp
->eregs
+ ESP_TCLOW
);
1757 sbus_writeb(0, esp
->eregs
+ ESP_TCMED
);
1758 sbus_writeb(0, esp
->eregs
+ FAS_RLO
);
1759 sbus_writeb(0, esp
->eregs
+ FAS_RHI
);
1760 esp_cmd(esp
, the_esp_command
);
1762 /* Talk about touchy hardware... */
1763 esp
->prev_hme_dmacsr
= ((esp
->prev_hme_dmacsr
|
1764 (DMA_SCSI_DISAB
| DMA_ENABLE
)) &
1766 sbus_writel(16, esp
->dregs
+ DMA_COUNT
);
1767 sbus_writel(esp
->esp_command_dvma
, esp
->dregs
+ DMA_ADDR
);
1768 sbus_writel(esp
->prev_hme_dmacsr
, esp
->dregs
+ DMA_CSR
);
1772 /* Set up the DMA and ESP counters */
1773 sbus_writeb(i
, esp
->eregs
+ ESP_TCLOW
);
1774 sbus_writeb(0, esp
->eregs
+ ESP_TCMED
);
1775 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
1776 tmp
&= ~DMA_ST_WRITE
;
1778 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
1779 if (esp
->dma
->revision
== dvmaesc1
) {
1780 if (i
) /* Workaround ESC gate array SBUS rerun bug. */
1781 sbus_writel(PAGE_SIZE
, esp
->dregs
+ DMA_COUNT
);
1783 sbus_writel(esp
->esp_command_dvma
, esp
->dregs
+ DMA_ADDR
);
1785 /* Tell ESP to "go". */
1786 esp_cmd(esp
, the_esp_command
);
1790 /* Queue a SCSI command delivered from the mid-level Linux SCSI code. */
1791 static int esp_queue(struct scsi_cmnd
*SCpnt
, void (*done
)(struct scsi_cmnd
*))
1795 /* Set up func ptr and initial driver cmd-phase. */
1796 SCpnt
->scsi_done
= done
;
1797 SCpnt
->SCp
.phase
= not_issued
;
1799 /* We use the scratch area. */
1800 ESPQUEUE(("esp_queue: target=%d lun=%d ", SCpnt
->device
->id
, SCpnt
->device
->lun
));
1801 ESPDISC(("N<%02x,%02x>", SCpnt
->device
->id
, SCpnt
->device
->lun
));
1803 esp
= (struct esp
*) SCpnt
->device
->host
->hostdata
;
1804 esp_get_dmabufs(esp
, SCpnt
);
1805 esp_save_pointers(esp
, SCpnt
); /* FIXME for tag queueing */
1807 SCpnt
->SCp
.Status
= CHECK_CONDITION
;
1808 SCpnt
->SCp
.Message
= 0xff;
1809 SCpnt
->SCp
.sent_command
= 0;
1811 /* Place into our queue. */
1812 if (SCpnt
->cmnd
[0] == REQUEST_SENSE
) {
1813 ESPQUEUE(("RQSENSE\n"));
1814 prepend_SC(&esp
->issue_SC
, SCpnt
);
1817 append_SC(&esp
->issue_SC
, SCpnt
);
1820 /* Run it now if we can. */
1821 if (!esp
->current_SC
&& !esp
->resetting_bus
)
1827 /* Dump driver state. */
1828 static void esp_dump_cmd(struct scsi_cmnd
*SCptr
)
1830 ESPLOG(("[tgt<%02x> lun<%02x> "
1831 "pphase<%s> cphase<%s>]",
1832 SCptr
->device
->id
, SCptr
->device
->lun
,
1833 phase_string(SCptr
->SCp
.sent_command
),
1834 phase_string(SCptr
->SCp
.phase
)));
1837 static void esp_dump_state(struct esp
*esp
)
1839 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
1840 #ifdef DEBUG_ESP_CMDS
1844 ESPLOG(("esp%d: dumping state\n", esp
->esp_id
));
1845 ESPLOG(("esp%d: dma -- cond_reg<%08x> addr<%08x>\n",
1847 sbus_readl(esp
->dregs
+ DMA_CSR
),
1848 sbus_readl(esp
->dregs
+ DMA_ADDR
)));
1849 ESPLOG(("esp%d: SW [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
1850 esp
->esp_id
, esp
->sreg
, esp
->seqreg
, esp
->ireg
));
1851 ESPLOG(("esp%d: HW reread [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
1853 sbus_readb(esp
->eregs
+ ESP_STATUS
),
1854 sbus_readb(esp
->eregs
+ ESP_SSTEP
),
1855 sbus_readb(esp
->eregs
+ ESP_INTRPT
)));
1856 #ifdef DEBUG_ESP_CMDS
1857 printk("esp%d: last ESP cmds [", esp
->esp_id
);
1858 i
= (esp
->espcmdent
- 1) & 31;
1859 printk("<"); esp_print_cmd(esp
->espcmdlog
[i
]); printk(">");
1861 printk("<"); esp_print_cmd(esp
->espcmdlog
[i
]); printk(">");
1863 printk("<"); esp_print_cmd(esp
->espcmdlog
[i
]); printk(">");
1865 printk("<"); esp_print_cmd(esp
->espcmdlog
[i
]); printk(">");
1867 #endif /* (DEBUG_ESP_CMDS) */
1870 ESPLOG(("esp%d: current command ", esp
->esp_id
));
1871 esp_dump_cmd(SCptr
);
1874 SCptr
= esp
->disconnected_SC
;
1875 ESPLOG(("esp%d: disconnected ", esp
->esp_id
));
1877 esp_dump_cmd(SCptr
);
1878 SCptr
= (struct scsi_cmnd
*) SCptr
->host_scribble
;
1883 /* Abort a command. The host_lock is acquired by caller. */
1884 static int esp_abort(struct scsi_cmnd
*SCptr
)
1886 struct esp
*esp
= (struct esp
*) SCptr
->device
->host
->hostdata
;
1889 ESPLOG(("esp%d: Aborting command\n", esp
->esp_id
));
1890 esp_dump_state(esp
);
1892 /* Wheee, if this is the current command on the bus, the
1893 * best we can do is assert ATN and wait for msgout phase.
1894 * This should even fix a hung SCSI bus when we lose state
1895 * in the driver and timeout because the eventual phase change
1896 * will cause the ESP to (eventually) give an interrupt.
1898 if (esp
->current_SC
== SCptr
) {
1899 esp
->cur_msgout
[0] = ABORT
;
1900 esp
->msgout_len
= 1;
1901 esp
->msgout_ctr
= 0;
1902 esp_cmd(esp
, ESP_CMD_SATN
);
1906 /* If it is still in the issue queue then we can safely
1907 * call the completion routine and report abort success.
1909 don
= (sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_INT_ENAB
);
1911 ESP_INTSOFF(esp
->dregs
);
1913 if (esp
->issue_SC
) {
1914 struct scsi_cmnd
**prev
, *this;
1915 for (prev
= (&esp
->issue_SC
), this = esp
->issue_SC
;
1917 prev
= (struct scsi_cmnd
**) &(this->host_scribble
),
1918 this = (struct scsi_cmnd
*) this->host_scribble
) {
1920 if (this == SCptr
) {
1921 *prev
= (struct scsi_cmnd
*) this->host_scribble
;
1922 this->host_scribble
= NULL
;
1924 esp_release_dmabufs(esp
, this);
1925 this->result
= DID_ABORT
<< 16;
1926 this->scsi_done(this);
1929 ESP_INTSON(esp
->dregs
);
1936 /* Yuck, the command to abort is disconnected, it is not
1937 * worth trying to abort it now if something else is live
1938 * on the bus at this time. So, we let the SCSI code wait
1939 * a little bit and try again later.
1941 if (esp
->current_SC
) {
1943 ESP_INTSON(esp
->dregs
);
1947 /* It's disconnected, we have to reconnect to re-establish
1948 * the nexus and tell the device to abort. However, we really
1949 * cannot 'reconnect' per se. Don't try to be fancy, just
1950 * indicate failure, which causes our caller to reset the whole
1955 ESP_INTSON(esp
->dregs
);
1960 /* We've sent ESP_CMD_RS to the ESP, the interrupt had just
1961 * arrived indicating the end of the SCSI bus reset. Our job
1962 * is to clean out the command queues and begin re-execution
1963 * of SCSI commands once more.
1965 static int esp_finish_reset(struct esp
*esp
)
1967 struct scsi_cmnd
*sp
= esp
->current_SC
;
1969 /* Clean up currently executing command, if any. */
1971 esp
->current_SC
= NULL
;
1973 esp_release_dmabufs(esp
, sp
);
1974 sp
->result
= (DID_RESET
<< 16);
1979 /* Clean up disconnected queue, they have been invalidated
1982 if (esp
->disconnected_SC
) {
1983 while ((sp
= remove_first_SC(&esp
->disconnected_SC
)) != NULL
) {
1984 esp_release_dmabufs(esp
, sp
);
1985 sp
->result
= (DID_RESET
<< 16);
1991 /* SCSI bus reset is complete. */
1992 esp
->resetting_bus
= 0;
1993 wake_up(&esp
->reset_queue
);
1995 /* Ok, now it is safe to get commands going once more. */
2002 static int esp_do_resetbus(struct esp
*esp
)
2004 ESPLOG(("esp%d: Resetting scsi bus\n", esp
->esp_id
));
2005 esp
->resetting_bus
= 1;
2006 esp_cmd(esp
, ESP_CMD_RS
);
2011 /* Reset ESP chip, reset hanging bus, then kill active and
2012 * disconnected commands for targets without soft reset.
2014 * The host_lock is acquired by caller.
2016 static int esp_reset(struct scsi_cmnd
*SCptr
)
2018 struct esp
*esp
= (struct esp
*) SCptr
->device
->host
->hostdata
;
2020 spin_lock_irq(esp
->ehost
->host_lock
);
2021 (void) esp_do_resetbus(esp
);
2022 spin_unlock_irq(esp
->ehost
->host_lock
);
2024 wait_event(esp
->reset_queue
, (esp
->resetting_bus
== 0));
2029 /* Internal ESP done function. */
2030 static void esp_done(struct esp
*esp
, int error
)
2032 struct scsi_cmnd
*done_SC
= esp
->current_SC
;
2034 esp
->current_SC
= NULL
;
2036 esp_release_dmabufs(esp
, done_SC
);
2037 done_SC
->result
= error
;
2039 done_SC
->scsi_done(done_SC
);
2041 /* Bus is free, issue any commands in the queue. */
2042 if (esp
->issue_SC
&& !esp
->current_SC
)
2047 /* Wheee, ESP interrupt engine. */
2049 /* Forward declarations. */
2050 static int esp_do_phase_determine(struct esp
*esp
);
2051 static int esp_do_data_finale(struct esp
*esp
);
2052 static int esp_select_complete(struct esp
*esp
);
2053 static int esp_do_status(struct esp
*esp
);
2054 static int esp_do_msgin(struct esp
*esp
);
2055 static int esp_do_msgindone(struct esp
*esp
);
2056 static int esp_do_msgout(struct esp
*esp
);
2057 static int esp_do_cmdbegin(struct esp
*esp
);
2059 #define sreg_datainp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DIP)
2060 #define sreg_dataoutp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DOP)
2062 /* Read any bytes found in the FAS366 fifo, storing them into
2063 * the ESP driver software state structure.
2065 static void hme_fifo_read(struct esp
*esp
)
2068 u8 status
= esp
->sreg
;
2070 /* Cannot safely frob the fifo for these following cases, but
2071 * we must always read the fifo when the reselect interrupt
2074 if (((esp
->ireg
& ESP_INTR_RSEL
) == 0) &&
2075 (sreg_datainp(status
) ||
2076 sreg_dataoutp(status
) ||
2078 esp
->current_SC
->SCp
.phase
== in_data_done
))) {
2079 ESPHME(("<wkaround_skipped>"));
2081 unsigned long fcnt
= sbus_readb(esp
->eregs
+ ESP_FFLAGS
) & ESP_FF_FBYTES
;
2083 /* The HME stores bytes in multiples of 2 in the fifo. */
2084 ESPHME(("hme_fifo[fcnt=%d", (int)fcnt
));
2086 esp
->hme_fifo_workaround_buffer
[count
++] =
2087 sbus_readb(esp
->eregs
+ ESP_FDATA
);
2088 esp
->hme_fifo_workaround_buffer
[count
++] =
2089 sbus_readb(esp
->eregs
+ ESP_FDATA
);
2090 ESPHME(("<%02x,%02x>", esp
->hme_fifo_workaround_buffer
[count
-2], esp
->hme_fifo_workaround_buffer
[count
-1]));
2093 if (sbus_readb(esp
->eregs
+ ESP_STATUS2
) & ESP_STAT2_F1BYTE
) {
2094 ESPHME(("<poke_byte>"));
2095 sbus_writeb(0, esp
->eregs
+ ESP_FDATA
);
2096 esp
->hme_fifo_workaround_buffer
[count
++] =
2097 sbus_readb(esp
->eregs
+ ESP_FDATA
);
2098 ESPHME(("<%02x,0x00>", esp
->hme_fifo_workaround_buffer
[count
-1]));
2099 ESPHME(("CMD_FLUSH"));
2100 esp_cmd(esp
, ESP_CMD_FLUSH
);
2102 ESPHME(("no_xtra_byte"));
2105 ESPHME(("wkarnd_cnt=%d]", (int)count
));
2106 esp
->hme_fifo_workaround_count
= count
;
2109 static inline void hme_fifo_push(struct esp
*esp
, u8
*bytes
, u8 count
)
2111 esp_cmd(esp
, ESP_CMD_FLUSH
);
2114 sbus_writeb(tmp
, esp
->eregs
+ ESP_FDATA
);
2115 sbus_writeb(0, esp
->eregs
+ ESP_FDATA
);
2120 /* We try to avoid some interrupts by jumping ahead and see if the ESP
2121 * has gotten far enough yet. Hence the following.
2123 static inline int skipahead1(struct esp
*esp
, struct scsi_cmnd
*scp
,
2124 int prev_phase
, int new_phase
)
2126 if (scp
->SCp
.sent_command
!= prev_phase
)
2128 if (ESP_IRQ_P(esp
->dregs
)) {
2129 /* Yes, we are able to save an interrupt. */
2130 if (esp
->erev
== fashme
)
2131 esp
->sreg2
= sbus_readb(esp
->eregs
+ ESP_STATUS2
);
2132 esp
->sreg
= (sbus_readb(esp
->eregs
+ ESP_STATUS
) & ~(ESP_STAT_INTR
));
2133 esp
->ireg
= sbus_readb(esp
->eregs
+ ESP_INTRPT
);
2134 if (esp
->erev
== fashme
) {
2135 /* This chip is really losing. */
2137 /* Must latch fifo before reading the interrupt
2138 * register else garbage ends up in the FIFO
2139 * which confuses the driver utterly.
2140 * Happy Meal indeed....
2142 ESPHME(("fifo_workaround]"));
2143 if (!(esp
->sreg2
& ESP_STAT2_FEMPTY
) ||
2144 (esp
->sreg2
& ESP_STAT2_F1BYTE
))
2147 if (!(esp
->ireg
& ESP_INTR_SR
))
2150 return do_reset_complete
;
2152 /* Ho hum, target is taking forever... */
2153 scp
->SCp
.sent_command
= new_phase
; /* so we don't recurse... */
2157 static inline int skipahead2(struct esp
*esp
, struct scsi_cmnd
*scp
,
2158 int prev_phase1
, int prev_phase2
, int new_phase
)
2160 if (scp
->SCp
.sent_command
!= prev_phase1
&&
2161 scp
->SCp
.sent_command
!= prev_phase2
)
2163 if (ESP_IRQ_P(esp
->dregs
)) {
2164 /* Yes, we are able to save an interrupt. */
2165 if (esp
->erev
== fashme
)
2166 esp
->sreg2
= sbus_readb(esp
->eregs
+ ESP_STATUS2
);
2167 esp
->sreg
= (sbus_readb(esp
->eregs
+ ESP_STATUS
) & ~(ESP_STAT_INTR
));
2168 esp
->ireg
= sbus_readb(esp
->eregs
+ ESP_INTRPT
);
2169 if (esp
->erev
== fashme
) {
2170 /* This chip is really losing. */
2173 /* Must latch fifo before reading the interrupt
2174 * register else garbage ends up in the FIFO
2175 * which confuses the driver utterly.
2176 * Happy Meal indeed....
2178 ESPHME(("fifo_workaround]"));
2179 if (!(esp
->sreg2
& ESP_STAT2_FEMPTY
) ||
2180 (esp
->sreg2
& ESP_STAT2_F1BYTE
))
2183 if (!(esp
->ireg
& ESP_INTR_SR
))
2186 return do_reset_complete
;
2188 /* Ho hum, target is taking forever... */
2189 scp
->SCp
.sent_command
= new_phase
; /* so we don't recurse... */
2193 /* Now some dma helpers. */
2194 static void dma_setup(struct esp
*esp
, __u32 addr
, int count
, int write
)
2196 u32 nreg
= sbus_readl(esp
->dregs
+ DMA_CSR
);
2199 nreg
|= DMA_ST_WRITE
;
2201 nreg
&= ~(DMA_ST_WRITE
);
2203 sbus_writel(nreg
, esp
->dregs
+ DMA_CSR
);
2204 if (esp
->dma
->revision
== dvmaesc1
) {
2205 /* This ESC gate array sucks! */
2207 __u32 dest
= src
+ count
;
2209 if (dest
& (PAGE_SIZE
- 1))
2210 count
= PAGE_ALIGN(count
);
2211 sbus_writel(count
, esp
->dregs
+ DMA_COUNT
);
2213 sbus_writel(addr
, esp
->dregs
+ DMA_ADDR
);
2216 static void dma_drain(struct esp
*esp
)
2220 if (esp
->dma
->revision
== dvmahme
)
2222 if ((tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
)) & DMA_FIFO_ISDRAIN
) {
2223 switch (esp
->dma
->revision
) {
2225 tmp
|= DMA_FIFO_STDRAIN
;
2226 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
2230 while (sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_FIFO_ISDRAIN
)
2236 static void dma_invalidate(struct esp
*esp
)
2240 if (esp
->dma
->revision
== dvmahme
) {
2241 sbus_writel(DMA_RST_SCSI
, esp
->dregs
+ DMA_CSR
);
2243 esp
->prev_hme_dmacsr
= ((esp
->prev_hme_dmacsr
|
2244 (DMA_PARITY_OFF
| DMA_2CLKS
|
2245 DMA_SCSI_DISAB
| DMA_INT_ENAB
)) &
2246 ~(DMA_ST_WRITE
| DMA_ENABLE
));
2248 sbus_writel(0, esp
->dregs
+ DMA_CSR
);
2249 sbus_writel(esp
->prev_hme_dmacsr
, esp
->dregs
+ DMA_CSR
);
2251 /* This is necessary to avoid having the SCSI channel
2252 * engine lock up on us.
2254 sbus_writel(0, esp
->dregs
+ DMA_ADDR
);
2256 while ((tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
)) & DMA_PEND_READ
)
2259 tmp
&= ~(DMA_ENABLE
| DMA_ST_WRITE
| DMA_BCNT_ENAB
);
2260 tmp
|= DMA_FIFO_INV
;
2261 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
2262 tmp
&= ~DMA_FIFO_INV
;
2263 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
2267 static inline void dma_flashclear(struct esp
*esp
)
2270 dma_invalidate(esp
);
2273 static int dma_can_transfer(struct esp
*esp
, struct scsi_cmnd
*sp
)
2275 __u32 base
, end
, sz
;
2277 if (esp
->dma
->revision
== dvmarev3
) {
2278 sz
= sp
->SCp
.this_residual
;
2282 base
= ((__u32
)((unsigned long)sp
->SCp
.ptr
));
2283 base
&= (0x1000000 - 1);
2284 end
= (base
+ sp
->SCp
.this_residual
);
2285 if (end
> 0x1000000)
2292 /* Misc. esp helper macros. */
2293 #define esp_setcount(__eregs, __cnt, __hme) \
2294 sbus_writeb(((__cnt)&0xff), (__eregs) + ESP_TCLOW); \
2295 sbus_writeb((((__cnt)>>8)&0xff), (__eregs) + ESP_TCMED); \
2297 sbus_writeb((((__cnt)>>16)&0xff), (__eregs) + FAS_RLO); \
2298 sbus_writeb(0, (__eregs) + FAS_RHI); \
2301 #define esp_getcount(__eregs, __hme) \
2302 ((sbus_readb((__eregs) + ESP_TCLOW)&0xff) | \
2303 ((sbus_readb((__eregs) + ESP_TCMED)&0xff) << 8) | \
2304 ((__hme) ? sbus_readb((__eregs) + FAS_RLO) << 16 : 0))
2306 #define fcount(__esp) \
2307 (((__esp)->erev == fashme) ? \
2308 (__esp)->hme_fifo_workaround_count : \
2309 sbus_readb(((__esp)->eregs) + ESP_FFLAGS) & ESP_FF_FBYTES)
2311 #define fnzero(__esp) \
2312 (((__esp)->erev == fashme) ? 0 : \
2313 sbus_readb(((__esp)->eregs) + ESP_FFLAGS) & ESP_FF_ONOTZERO)
2315 /* XXX speculative nops unnecessary when continuing amidst a data phase
2316 * XXX even on esp100!!! another case of flooding the bus with I/O reg
2319 #define esp_maybe_nop(__esp) \
2320 if ((__esp)->erev == esp100) \
2321 esp_cmd((__esp), ESP_CMD_NULL)
2323 #define sreg_to_dataphase(__sreg) \
2324 ((((__sreg) & ESP_STAT_PMASK) == ESP_DOP) ? in_dataout : in_datain)
2326 /* The ESP100 when in synchronous data phase, can mistake a long final
2327 * REQ pulse from the target as an extra byte, it places whatever is on
2328 * the data lines into the fifo. For now, we will assume when this
2329 * happens that the target is a bit quirky and we don't want to
2330 * be talking synchronously to it anyways. Regardless, we need to
2331 * tell the ESP to eat the extraneous byte so that we can proceed
2332 * to the next phase.
2334 static int esp100_sync_hwbug(struct esp
*esp
, struct scsi_cmnd
*sp
, int fifocnt
)
2336 /* Do not touch this piece of code. */
2337 if ((!(esp
->erev
== esp100
)) ||
2338 (!(sreg_datainp((esp
->sreg
= sbus_readb(esp
->eregs
+ ESP_STATUS
))) &&
2340 !(sreg_dataoutp(esp
->sreg
) && !fnzero(esp
)))) {
2341 if (sp
->SCp
.phase
== in_dataout
)
2342 esp_cmd(esp
, ESP_CMD_FLUSH
);
2345 /* Async mode for this guy. */
2346 build_sync_nego_msg(esp
, 0, 0);
2348 /* Ack the bogus byte, but set ATN first. */
2349 esp_cmd(esp
, ESP_CMD_SATN
);
2350 esp_cmd(esp
, ESP_CMD_MOK
);
2355 /* This closes the window during a selection with a reselect pending, because
2356 * we use DMA for the selection process the FIFO should hold the correct
2357 * contents if we get reselected during this process. So we just need to
2358 * ack the possible illegal cmd interrupt pending on the esp100.
2360 static inline int esp100_reconnect_hwbug(struct esp
*esp
)
2364 if (esp
->erev
!= esp100
)
2366 tmp
= sbus_readb(esp
->eregs
+ ESP_INTRPT
);
2367 if (tmp
& ESP_INTR_SR
)
2372 /* This verifies the BUSID bits during a reselection so that we know which
2373 * target is talking to us.
2375 static inline int reconnect_target(struct esp
*esp
)
2377 int it
, me
= esp
->scsi_id_mask
, targ
= 0;
2379 if (2 != fcount(esp
))
2381 if (esp
->erev
== fashme
) {
2382 /* HME does not latch it's own BUS ID bits during
2383 * a reselection. Also the target number is given
2384 * as an unsigned char, not as a sole bit number
2385 * like the other ESP's do.
2386 * Happy Meal indeed....
2388 targ
= esp
->hme_fifo_workaround_buffer
[0];
2390 it
= sbus_readb(esp
->eregs
+ ESP_FDATA
);
2402 /* This verifies the identify from the target so that we know which lun is
2403 * being reconnected.
2405 static inline int reconnect_lun(struct esp
*esp
)
2409 if ((esp
->sreg
& ESP_STAT_PMASK
) != ESP_MIP
)
2411 if (esp
->erev
== fashme
)
2412 lun
= esp
->hme_fifo_workaround_buffer
[1];
2414 lun
= sbus_readb(esp
->eregs
+ ESP_FDATA
);
2416 /* Yes, you read this correctly. We report lun of zero
2417 * if we see parity error. ESP reports parity error for
2418 * the lun byte, and this is the only way to hope to recover
2419 * because the target is connected.
2421 if (esp
->sreg
& ESP_STAT_PERR
)
2424 /* Check for illegal bits being set in the lun. */
2425 if ((lun
& 0x40) || !(lun
& 0x80))
2431 /* This puts the driver in a state where it can revitalize a command that
2432 * is being continued due to reselection.
2434 static inline void esp_connect(struct esp
*esp
, struct scsi_cmnd
*sp
)
2436 struct esp_device
*esp_dev
= sp
->device
->hostdata
;
2438 if (esp
->prev_soff
!= esp_dev
->sync_max_offset
||
2439 esp
->prev_stp
!= esp_dev
->sync_min_period
||
2440 (esp
->erev
> esp100a
&&
2441 esp
->prev_cfg3
!= esp
->config3
[sp
->device
->id
])) {
2442 esp
->prev_soff
= esp_dev
->sync_max_offset
;
2443 esp
->prev_stp
= esp_dev
->sync_min_period
;
2444 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
2445 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
2446 if (esp
->erev
> esp100a
) {
2447 esp
->prev_cfg3
= esp
->config3
[sp
->device
->id
];
2448 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
2451 esp
->current_SC
= sp
;
2454 /* This will place the current working command back into the issue queue
2455 * if we are to receive a reselection amidst a selection attempt.
2457 static inline void esp_reconnect(struct esp
*esp
, struct scsi_cmnd
*sp
)
2459 if (!esp
->disconnected_SC
)
2460 ESPLOG(("esp%d: Weird, being reselected but disconnected "
2461 "command queue is empty.\n", esp
->esp_id
));
2463 esp
->current_SC
= NULL
;
2464 sp
->SCp
.phase
= not_issued
;
2465 append_SC(&esp
->issue_SC
, sp
);
2468 /* Begin message in phase. */
2469 static int esp_do_msgin(struct esp
*esp
)
2471 /* Must be very careful with the fifo on the HME */
2472 if ((esp
->erev
!= fashme
) ||
2473 !(sbus_readb(esp
->eregs
+ ESP_STATUS2
) & ESP_STAT2_FEMPTY
))
2474 esp_cmd(esp
, ESP_CMD_FLUSH
);
2476 esp_cmd(esp
, ESP_CMD_TI
);
2479 esp_advance_phase(esp
->current_SC
, in_msgindone
);
2483 /* This uses various DMA csr fields and the fifo flags count value to
2484 * determine how many bytes were successfully sent/received by the ESP.
2486 static inline int esp_bytes_sent(struct esp
*esp
, int fifo_count
)
2488 int rval
= sbus_readl(esp
->dregs
+ DMA_ADDR
) - esp
->esp_command_dvma
;
2490 if (esp
->dma
->revision
== dvmarev1
)
2491 rval
-= (4 - ((sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_READ_AHEAD
)>>11));
2492 return rval
- fifo_count
;
2495 static inline void advance_sg(struct scsi_cmnd
*sp
)
2498 --sp
->SCp
.buffers_residual
;
2499 sp
->SCp
.this_residual
= sg_dma_len(sp
->SCp
.buffer
);
2500 sp
->SCp
.ptr
= (char *)((unsigned long)sg_dma_address(sp
->SCp
.buffer
));
2503 /* Please note that the way I've coded these routines is that I _always_
2504 * check for a disconnect during any and all information transfer
2505 * phases. The SCSI standard states that the target _can_ cause a BUS
2506 * FREE condition by dropping all MSG/CD/IO/BSY signals. Also note
2507 * that during information transfer phases the target controls every
2508 * change in phase, the only thing the initiator can do is "ask" for
2509 * a message out phase by driving ATN true. The target can, and sometimes
2510 * will, completely ignore this request so we cannot assume anything when
2511 * we try to force a message out phase to abort/reset a target. Most of
2512 * the time the target will eventually be nice and go to message out, so
2513 * we may have to hold on to our state about what we want to tell the target
2514 * for some period of time.
2517 /* I think I have things working here correctly. Even partial transfers
2518 * within a buffer or sub-buffer should not upset us at all no matter
2519 * how bad the target and/or ESP fucks things up.
2521 static int esp_do_data(struct esp
*esp
)
2523 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
2524 int thisphase
, hmuch
;
2526 ESPDATA(("esp_do_data: "));
2528 thisphase
= sreg_to_dataphase(esp
->sreg
);
2529 esp_advance_phase(SCptr
, thisphase
);
2530 ESPDATA(("newphase<%s> ", (thisphase
== in_datain
) ? "DATAIN" : "DATAOUT"));
2531 hmuch
= dma_can_transfer(esp
, SCptr
);
2532 if (hmuch
> (64 * 1024) && (esp
->erev
!= fashme
))
2533 hmuch
= (64 * 1024);
2534 ESPDATA(("hmuch<%d> ", hmuch
));
2535 esp
->current_transfer_size
= hmuch
;
2537 if (esp
->erev
== fashme
) {
2538 u32 tmp
= esp
->prev_hme_dmacsr
;
2540 /* Always set the ESP count registers first. */
2541 esp_setcount(esp
->eregs
, hmuch
, 1);
2543 /* Get the DMA csr computed. */
2544 tmp
|= (DMA_SCSI_DISAB
| DMA_ENABLE
);
2545 if (thisphase
== in_datain
)
2546 tmp
|= DMA_ST_WRITE
;
2548 tmp
&= ~(DMA_ST_WRITE
);
2549 esp
->prev_hme_dmacsr
= tmp
;
2551 ESPDATA(("DMA|TI --> do_intr_end\n"));
2552 if (thisphase
== in_datain
) {
2553 sbus_writel(hmuch
, esp
->dregs
+ DMA_COUNT
);
2554 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
2556 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
2557 sbus_writel(hmuch
, esp
->dregs
+ DMA_COUNT
);
2559 sbus_writel((__u32
)((unsigned long)SCptr
->SCp
.ptr
), esp
->dregs
+DMA_ADDR
);
2560 sbus_writel(esp
->prev_hme_dmacsr
, esp
->dregs
+ DMA_CSR
);
2562 esp_setcount(esp
->eregs
, hmuch
, 0);
2563 dma_setup(esp
, ((__u32
)((unsigned long)SCptr
->SCp
.ptr
)),
2564 hmuch
, (thisphase
== in_datain
));
2565 ESPDATA(("DMA|TI --> do_intr_end\n"));
2566 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
2571 /* See how successful the data transfer was. */
2572 static int esp_do_data_finale(struct esp
*esp
)
2574 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
2575 struct esp_device
*esp_dev
= SCptr
->device
->hostdata
;
2576 int bogus_data
= 0, bytes_sent
= 0, fifocnt
, ecount
= 0;
2578 ESPDATA(("esp_do_data_finale: "));
2580 if (SCptr
->SCp
.phase
== in_datain
) {
2581 if (esp
->sreg
& ESP_STAT_PERR
) {
2582 /* Yuck, parity error. The ESP asserts ATN
2583 * so that we can go to message out phase
2584 * immediately and inform the target that
2585 * something bad happened.
2587 ESPLOG(("esp%d: data bad parity detected.\n",
2589 esp
->cur_msgout
[0] = INITIATOR_ERROR
;
2590 esp
->msgout_len
= 1;
2594 dma_invalidate(esp
);
2596 /* This could happen for the above parity error case. */
2597 if (esp
->ireg
!= ESP_INTR_BSERV
) {
2598 /* Please go to msgout phase, please please please... */
2599 ESPLOG(("esp%d: !BSERV after data, probably to msgout\n",
2601 return esp_do_phase_determine(esp
);
2604 /* Check for partial transfers and other horrible events.
2605 * Note, here we read the real fifo flags register even
2606 * on HME broken adapters because we skip the HME fifo
2607 * workaround code in esp_handle() if we are doing data
2608 * phase things. We don't want to fuck directly with
2609 * the fifo like that, especially if doing synchronous
2610 * transfers! Also, will need to double the count on
2611 * HME if we are doing wide transfers, as the HME fifo
2612 * will move and count 16-bit quantities during wide data.
2613 * SMCC _and_ Qlogic can both bite me.
2615 fifocnt
= (sbus_readb(esp
->eregs
+ ESP_FFLAGS
) & ESP_FF_FBYTES
);
2616 if (esp
->erev
!= fashme
)
2617 ecount
= esp_getcount(esp
->eregs
, 0);
2618 bytes_sent
= esp
->current_transfer_size
;
2620 ESPDATA(("trans_sz(%d), ", bytes_sent
));
2621 if (esp
->erev
== fashme
) {
2622 if (!(esp
->sreg
& ESP_STAT_TCNT
)) {
2623 ecount
= esp_getcount(esp
->eregs
, 1);
2624 bytes_sent
-= ecount
;
2627 /* Always subtract any cruft remaining in the FIFO. */
2628 if (esp
->prev_cfg3
& ESP_CONFIG3_EWIDE
)
2630 if (SCptr
->SCp
.phase
== in_dataout
)
2631 bytes_sent
-= fifocnt
;
2633 /* I have an IBM disk which exhibits the following
2634 * behavior during writes to it. It disconnects in
2635 * the middle of a partial transfer, the current sglist
2636 * buffer is 1024 bytes, the disk stops data transfer
2639 * However the FAS366 reports that 32 more bytes were
2640 * transferred than really were. This is precisely
2641 * the size of a fully loaded FIFO in wide scsi mode.
2642 * The FIFO state recorded indicates that it is empty.
2644 * I have no idea if this is a bug in the FAS366 chip
2645 * or a bug in the firmware on this IBM disk. In any
2646 * event the following seems to be a good workaround. -DaveM
2648 if (bytes_sent
!= esp
->current_transfer_size
&&
2649 SCptr
->SCp
.phase
== in_dataout
) {
2650 int mask
= (64 - 1);
2652 if ((esp
->prev_cfg3
& ESP_CONFIG3_EWIDE
) == 0)
2655 if (bytes_sent
& mask
)
2656 bytes_sent
-= (bytes_sent
& mask
);
2659 if (!(esp
->sreg
& ESP_STAT_TCNT
))
2660 bytes_sent
-= ecount
;
2661 if (SCptr
->SCp
.phase
== in_dataout
)
2662 bytes_sent
-= fifocnt
;
2665 ESPDATA(("bytes_sent(%d), ", bytes_sent
));
2667 /* If we were in synchronous mode, check for peculiarities. */
2668 if (esp
->erev
== fashme
) {
2669 if (esp_dev
->sync_max_offset
) {
2670 if (SCptr
->SCp
.phase
== in_dataout
)
2671 esp_cmd(esp
, ESP_CMD_FLUSH
);
2673 esp_cmd(esp
, ESP_CMD_FLUSH
);
2676 if (esp_dev
->sync_max_offset
)
2677 bogus_data
= esp100_sync_hwbug(esp
, SCptr
, fifocnt
);
2679 esp_cmd(esp
, ESP_CMD_FLUSH
);
2682 /* Until we are sure of what has happened, we are certainly
2685 esp_advance_phase(SCptr
, in_the_dark
);
2687 if (bytes_sent
< 0) {
2688 /* I've seen this happen due to lost state in this
2689 * driver. No idea why it happened, but allowing
2690 * this value to be negative caused things to
2691 * lock up. This allows greater chance of recovery.
2692 * In fact every time I've seen this, it has been
2693 * a driver bug without question.
2695 ESPLOG(("esp%d: yieee, bytes_sent < 0!\n", esp
->esp_id
));
2696 ESPLOG(("esp%d: csz=%d fifocount=%d ecount=%d\n",
2698 esp
->current_transfer_size
, fifocnt
, ecount
));
2699 ESPLOG(("esp%d: use_sg=%d ptr=%p this_residual=%d\n",
2701 SCptr
->use_sg
, SCptr
->SCp
.ptr
, SCptr
->SCp
.this_residual
));
2702 ESPLOG(("esp%d: Forcing async for target %d\n", esp
->esp_id
,
2703 SCptr
->device
->id
));
2704 SCptr
->device
->borken
= 1;
2709 /* Update the state of our transfer. */
2710 SCptr
->SCp
.ptr
+= bytes_sent
;
2711 SCptr
->SCp
.this_residual
-= bytes_sent
;
2712 if (SCptr
->SCp
.this_residual
< 0) {
2714 ESPLOG(("esp%d: Data transfer overrun.\n", esp
->esp_id
));
2715 SCptr
->SCp
.this_residual
= 0;
2718 /* Maybe continue. */
2720 ESPDATA(("!bogus_data, "));
2722 /* NO MATTER WHAT, we advance the scatterlist,
2723 * if the target should decide to disconnect
2724 * in between scatter chunks (which is common)
2725 * we could die horribly! I used to have the sg
2726 * advance occur only if we are going back into
2727 * (or are staying in) a data phase, you can
2728 * imagine the hell I went through trying to
2731 if (SCptr
->use_sg
&& !SCptr
->SCp
.this_residual
)
2733 if (sreg_datainp(esp
->sreg
) || sreg_dataoutp(esp
->sreg
)) {
2734 ESPDATA(("to more data\n"));
2735 return esp_do_data(esp
);
2737 ESPDATA(("to new phase\n"));
2738 return esp_do_phase_determine(esp
);
2740 /* Bogus data, just wait for next interrupt. */
2741 ESPLOG(("esp%d: bogus_data during end of data phase\n",
2746 /* We received a non-good status return at the end of
2747 * running a SCSI command. This is used to decide if
2748 * we should clear our synchronous transfer state for
2749 * such a device when that happens.
2751 * The idea is that when spinning up a disk or rewinding
2752 * a tape, we don't want to go into a loop re-negotiating
2753 * synchronous capabilities over and over.
2755 static int esp_should_clear_sync(struct scsi_cmnd
*sp
)
2757 u8 cmd1
= sp
->cmnd
[0];
2758 u8 cmd2
= sp
->data_cmnd
[0];
2760 /* These cases are for spinning up a disk and
2761 * waiting for that spinup to complete.
2763 if (cmd1
== START_STOP
||
2767 if (cmd1
== TEST_UNIT_READY
||
2768 cmd2
== TEST_UNIT_READY
)
2771 /* One more special case for SCSI tape drives,
2772 * this is what is used to probe the device for
2773 * completion of a rewind or tape load operation.
2775 if (sp
->device
->type
== TYPE_TAPE
) {
2776 if (cmd1
== MODE_SENSE
||
2784 /* Either a command is completing or a target is dropping off the bus
2785 * to continue the command in the background so we can do other work.
2787 static int esp_do_freebus(struct esp
*esp
)
2789 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
2790 struct esp_device
*esp_dev
= SCptr
->device
->hostdata
;
2793 rval
= skipahead2(esp
, SCptr
, in_status
, in_msgindone
, in_freeing
);
2796 if (esp
->ireg
!= ESP_INTR_DC
) {
2797 ESPLOG(("esp%d: Target will not disconnect\n", esp
->esp_id
));
2798 return do_reset_bus
; /* target will not drop BSY... */
2800 esp
->msgout_len
= 0;
2801 esp
->prevmsgout
= NOP
;
2802 if (esp
->prevmsgin
== COMMAND_COMPLETE
) {
2803 /* Normal end of nexus. */
2804 if (esp
->disconnected_SC
|| (esp
->erev
== fashme
))
2805 esp_cmd(esp
, ESP_CMD_ESEL
);
2807 if (SCptr
->SCp
.Status
!= GOOD
&&
2808 SCptr
->SCp
.Status
!= CONDITION_GOOD
&&
2809 ((1<<SCptr
->device
->id
) & esp
->targets_present
) &&
2811 esp_dev
->sync_max_offset
) {
2812 /* SCSI standard says that the synchronous capabilities
2813 * should be renegotiated at this point. Most likely
2814 * we are about to request sense from this target
2815 * in which case we want to avoid using sync
2816 * transfers until we are sure of the current target
2819 ESPMISC(("esp: Status <%d> for target %d lun %d\n",
2820 SCptr
->SCp
.Status
, SCptr
->device
->id
, SCptr
->device
->lun
));
2822 /* But don't do this when spinning up a disk at
2823 * boot time while we poll for completion as it
2824 * fills up the console with messages. Also, tapes
2825 * can report not ready many times right after
2826 * loading up a tape.
2828 if (esp_should_clear_sync(SCptr
) != 0)
2831 ESPDISC(("F<%02x,%02x>", SCptr
->device
->id
, SCptr
->device
->lun
));
2832 esp_done(esp
, ((SCptr
->SCp
.Status
& 0xff) |
2833 ((SCptr
->SCp
.Message
& 0xff)<<8) |
2835 } else if (esp
->prevmsgin
== DISCONNECT
) {
2836 /* Normal disconnect. */
2837 esp_cmd(esp
, ESP_CMD_ESEL
);
2838 ESPDISC(("D<%02x,%02x>", SCptr
->device
->id
, SCptr
->device
->lun
));
2839 append_SC(&esp
->disconnected_SC
, SCptr
);
2840 esp
->current_SC
= NULL
;
2844 /* Driver bug, we do not expect a disconnect here
2845 * and should not have advanced the state engine
2848 ESPLOG(("esp%d: last msg not disc and not cmd cmplt.\n",
2850 return do_reset_bus
;
2855 /* When a reselect occurs, and we cannot find the command to
2856 * reconnect to in our queues, we do this.
2858 static int esp_bad_reconnect(struct esp
*esp
)
2860 struct scsi_cmnd
*sp
;
2862 ESPLOG(("esp%d: Eieeee, reconnecting unknown command!\n",
2864 ESPLOG(("QUEUE DUMP\n"));
2866 ESPLOG(("esp%d: issue_SC[", esp
->esp_id
));
2868 ESPLOG(("<%02x,%02x>", sp
->device
->id
, sp
->device
->lun
));
2869 sp
= (struct scsi_cmnd
*) sp
->host_scribble
;
2872 sp
= esp
->current_SC
;
2873 ESPLOG(("esp%d: current_SC[", esp
->esp_id
));
2875 ESPLOG(("<%02x,%02x>", sp
->device
->id
, sp
->device
->lun
));
2879 sp
= esp
->disconnected_SC
;
2880 ESPLOG(("esp%d: disconnected_SC[", esp
->esp_id
));
2882 ESPLOG(("<%02x,%02x>", sp
->device
->id
, sp
->device
->lun
));
2883 sp
= (struct scsi_cmnd
*) sp
->host_scribble
;
2886 return do_reset_bus
;
2889 /* Do the needy when a target tries to reconnect to us. */
2890 static int esp_do_reconnect(struct esp
*esp
)
2893 struct scsi_cmnd
*SCptr
;
2895 /* Check for all bogus conditions first. */
2896 target
= reconnect_target(esp
);
2898 ESPDISC(("bad bus bits\n"));
2899 return do_reset_bus
;
2901 lun
= reconnect_lun(esp
);
2903 ESPDISC(("target=%2x, bad identify msg\n", target
));
2904 return do_reset_bus
;
2907 /* Things look ok... */
2908 ESPDISC(("R<%02x,%02x>", target
, lun
));
2910 /* Must not flush FIFO or DVMA on HME. */
2911 if (esp
->erev
!= fashme
) {
2912 esp_cmd(esp
, ESP_CMD_FLUSH
);
2913 if (esp100_reconnect_hwbug(esp
))
2914 return do_reset_bus
;
2915 esp_cmd(esp
, ESP_CMD_NULL
);
2918 SCptr
= remove_SC(&esp
->disconnected_SC
, (u8
) target
, (u8
) lun
);
2920 return esp_bad_reconnect(esp
);
2922 esp_connect(esp
, SCptr
);
2923 esp_cmd(esp
, ESP_CMD_MOK
);
2925 if (esp
->erev
== fashme
)
2926 sbus_writeb(((SCptr
->device
->id
& 0xf) |
2927 (ESP_BUSID_RESELID
| ESP_BUSID_CTR32BIT
)),
2928 esp
->eregs
+ ESP_BUSID
);
2930 /* Reconnect implies a restore pointers operation. */
2931 esp_restore_pointers(esp
, SCptr
);
2934 esp_advance_phase(SCptr
, in_the_dark
);
2938 /* End of NEXUS (hopefully), pick up status + message byte then leave if
2941 static int esp_do_status(struct esp
*esp
)
2943 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
2946 rval
= skipahead1(esp
, SCptr
, in_the_dark
, in_status
);
2950 ESPSTAT(("esp_do_status: "));
2951 if (intr
!= ESP_INTR_DC
) {
2952 int message_out
= 0; /* for parity problems */
2954 /* Ack the message. */
2955 ESPSTAT(("ack msg, "));
2956 esp_cmd(esp
, ESP_CMD_MOK
);
2958 if (esp
->erev
!= fashme
) {
2959 dma_flashclear(esp
);
2961 /* Wait till the first bits settle. */
2962 while (esp
->esp_command
[0] == 0xff)
2965 esp
->esp_command
[0] = esp
->hme_fifo_workaround_buffer
[0];
2966 esp
->esp_command
[1] = esp
->hme_fifo_workaround_buffer
[1];
2969 ESPSTAT(("got something, "));
2970 /* ESP chimes in with one of
2972 * 1) function done interrupt:
2973 * both status and message in bytes
2976 * 2) bus service interrupt:
2977 * only status byte was acquired
2980 * can't happen, but we test for it
2983 * ALSO: If bad parity was detected on either
2984 * the status _or_ the message byte then
2985 * the ESP has asserted ATN on the bus
2986 * and we must therefore wait for the
2987 * next phase change.
2989 if (intr
& ESP_INTR_FDONE
) {
2990 /* We got it all, hallejulia. */
2991 ESPSTAT(("got both, "));
2992 SCptr
->SCp
.Status
= esp
->esp_command
[0];
2993 SCptr
->SCp
.Message
= esp
->esp_command
[1];
2994 esp
->prevmsgin
= SCptr
->SCp
.Message
;
2995 esp
->cur_msgin
[0] = SCptr
->SCp
.Message
;
2996 if (esp
->sreg
& ESP_STAT_PERR
) {
2997 /* There was bad parity for the
2998 * message byte, the status byte
3001 message_out
= MSG_PARITY_ERROR
;
3003 } else if (intr
== ESP_INTR_BSERV
) {
3004 /* Only got status byte. */
3005 ESPLOG(("esp%d: got status only, ", esp
->esp_id
));
3006 if (!(esp
->sreg
& ESP_STAT_PERR
)) {
3007 SCptr
->SCp
.Status
= esp
->esp_command
[0];
3008 SCptr
->SCp
.Message
= 0xff;
3010 /* The status byte had bad parity.
3011 * we leave the scsi_pointer Status
3012 * field alone as we set it to a default
3013 * of CHECK_CONDITION in esp_queue.
3015 message_out
= INITIATOR_ERROR
;
3018 /* This shouldn't happen ever. */
3019 ESPSTAT(("got bolixed\n"));
3020 esp_advance_phase(SCptr
, in_the_dark
);
3021 return esp_do_phase_determine(esp
);
3025 ESPSTAT(("status=%2x msg=%2x, ", SCptr
->SCp
.Status
,
3026 SCptr
->SCp
.Message
));
3027 if (SCptr
->SCp
.Message
== COMMAND_COMPLETE
) {
3028 ESPSTAT(("and was COMMAND_COMPLETE\n"));
3029 esp_advance_phase(SCptr
, in_freeing
);
3030 return esp_do_freebus(esp
);
3032 ESPLOG(("esp%d: and _not_ COMMAND_COMPLETE\n",
3034 esp
->msgin_len
= esp
->msgin_ctr
= 1;
3035 esp_advance_phase(SCptr
, in_msgindone
);
3036 return esp_do_msgindone(esp
);
3039 /* With luck we'll be able to let the target
3040 * know that bad parity happened, it will know
3041 * which byte caused the problems and send it
3042 * again. For the case where the status byte
3043 * receives bad parity, I do not believe most
3044 * targets recover very well. We'll see.
3046 ESPLOG(("esp%d: bad parity somewhere mout=%2x\n",
3047 esp
->esp_id
, message_out
));
3048 esp
->cur_msgout
[0] = message_out
;
3049 esp
->msgout_len
= esp
->msgout_ctr
= 1;
3050 esp_advance_phase(SCptr
, in_the_dark
);
3051 return esp_do_phase_determine(esp
);
3054 /* If we disconnect now, all hell breaks loose. */
3055 ESPLOG(("esp%d: whoops, disconnect\n", esp
->esp_id
));
3056 esp_advance_phase(SCptr
, in_the_dark
);
3057 return esp_do_phase_determine(esp
);
3061 static int esp_enter_status(struct esp
*esp
)
3063 u8 thecmd
= ESP_CMD_ICCSEQ
;
3065 esp_cmd(esp
, ESP_CMD_FLUSH
);
3066 if (esp
->erev
!= fashme
) {
3069 esp
->esp_command
[0] = esp
->esp_command
[1] = 0xff;
3070 sbus_writeb(2, esp
->eregs
+ ESP_TCLOW
);
3071 sbus_writeb(0, esp
->eregs
+ ESP_TCMED
);
3072 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
3073 tmp
|= (DMA_ST_WRITE
| DMA_ENABLE
);
3074 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
3075 if (esp
->dma
->revision
== dvmaesc1
)
3076 sbus_writel(0x100, esp
->dregs
+ DMA_COUNT
);
3077 sbus_writel(esp
->esp_command_dvma
, esp
->dregs
+ DMA_ADDR
);
3078 thecmd
|= ESP_CMD_DMA
;
3080 esp_cmd(esp
, thecmd
);
3081 esp_advance_phase(esp
->current_SC
, in_status
);
3083 return esp_do_status(esp
);
3086 static int esp_disconnect_amidst_phases(struct esp
*esp
)
3088 struct scsi_cmnd
*sp
= esp
->current_SC
;
3089 struct esp_device
*esp_dev
= sp
->device
->hostdata
;
3091 /* This means real problems if we see this
3092 * here. Unless we were actually trying
3093 * to force the device to abort/reset.
3095 ESPLOG(("esp%d Disconnect amidst phases, ", esp
->esp_id
));
3096 ESPLOG(("pphase<%s> cphase<%s>, ",
3097 phase_string(sp
->SCp
.phase
),
3098 phase_string(sp
->SCp
.sent_command
)));
3100 if (esp
->disconnected_SC
!= NULL
|| (esp
->erev
== fashme
))
3101 esp_cmd(esp
, ESP_CMD_ESEL
);
3103 switch (esp
->cur_msgout
[0]) {
3105 /* We didn't expect this to happen at all. */
3106 ESPLOG(("device is bolixed\n"));
3107 esp_advance_phase(sp
, in_tgterror
);
3108 esp_done(esp
, (DID_ERROR
<< 16));
3111 case BUS_DEVICE_RESET
:
3112 ESPLOG(("device reset successful\n"));
3113 esp_dev
->sync_max_offset
= 0;
3114 esp_dev
->sync_min_period
= 0;
3116 esp_advance_phase(sp
, in_resetdev
);
3117 esp_done(esp
, (DID_RESET
<< 16));
3121 ESPLOG(("device abort successful\n"));
3122 esp_advance_phase(sp
, in_abortone
);
3123 esp_done(esp
, (DID_ABORT
<< 16));
3130 static int esp_enter_msgout(struct esp
*esp
)
3132 esp_advance_phase(esp
->current_SC
, in_msgout
);
3133 return esp_do_msgout(esp
);
3136 static int esp_enter_msgin(struct esp
*esp
)
3138 esp_advance_phase(esp
->current_SC
, in_msgin
);
3139 return esp_do_msgin(esp
);
3142 static int esp_enter_cmd(struct esp
*esp
)
3144 esp_advance_phase(esp
->current_SC
, in_cmdbegin
);
3145 return esp_do_cmdbegin(esp
);
3148 static int esp_enter_badphase(struct esp
*esp
)
3150 ESPLOG(("esp%d: Bizarre bus phase %2x.\n", esp
->esp_id
,
3151 esp
->sreg
& ESP_STAT_PMASK
));
3152 return do_reset_bus
;
3155 typedef int (*espfunc_t
)(struct esp
*);
3157 static espfunc_t phase_vector
[] = {
3158 esp_do_data
, /* ESP_DOP */
3159 esp_do_data
, /* ESP_DIP */
3160 esp_enter_cmd
, /* ESP_CMDP */
3161 esp_enter_status
, /* ESP_STATP */
3162 esp_enter_badphase
, /* ESP_STAT_PMSG */
3163 esp_enter_badphase
, /* ESP_STAT_PMSG | ESP_STAT_PIO */
3164 esp_enter_msgout
, /* ESP_MOP */
3165 esp_enter_msgin
, /* ESP_MIP */
3168 /* The target has control of the bus and we have to see where it has
3171 static int esp_do_phase_determine(struct esp
*esp
)
3173 if ((esp
->ireg
& ESP_INTR_DC
) != 0)
3174 return esp_disconnect_amidst_phases(esp
);
3175 return phase_vector
[esp
->sreg
& ESP_STAT_PMASK
](esp
);
3178 /* First interrupt after exec'ing a cmd comes here. */
3179 static int esp_select_complete(struct esp
*esp
)
3181 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
3182 struct esp_device
*esp_dev
= SCptr
->device
->hostdata
;
3183 int cmd_bytes_sent
, fcnt
;
3185 if (esp
->erev
!= fashme
)
3186 esp
->seqreg
= (sbus_readb(esp
->eregs
+ ESP_SSTEP
) & ESP_STEP_VBITS
);
3188 if (esp
->erev
== fashme
)
3189 fcnt
= esp
->hme_fifo_workaround_count
;
3191 fcnt
= (sbus_readb(esp
->eregs
+ ESP_FFLAGS
) & ESP_FF_FBYTES
);
3193 cmd_bytes_sent
= esp_bytes_sent(esp
, fcnt
);
3194 dma_invalidate(esp
);
3196 /* Let's check to see if a reselect happened
3197 * while we we're trying to select. This must
3200 if (esp
->ireg
== (ESP_INTR_RSEL
| ESP_INTR_FDONE
)) {
3201 esp_reconnect(esp
, SCptr
);
3202 return esp_do_reconnect(esp
);
3205 /* Looks like things worked, we should see a bus service &
3206 * a function complete interrupt at this point. Note we
3207 * are doing a direct comparison because we don't want to
3208 * be fooled into thinking selection was successful if
3209 * ESP_INTR_DC is set, see below.
3211 if (esp
->ireg
== (ESP_INTR_FDONE
| ESP_INTR_BSERV
)) {
3212 /* target speaks... */
3213 esp
->targets_present
|= (1<<SCptr
->device
->id
);
3215 /* What if the target ignores the sdtr? */
3219 /* See how far, if at all, we got in getting
3220 * the information out to the target.
3222 switch (esp
->seqreg
) {
3226 /* Arbitration won, target selected, but
3227 * we are in some phase which is not command
3228 * phase nor is it message out phase.
3230 * XXX We've confused the target, obviously.
3231 * XXX So clear it's state, but we also end
3232 * XXX up clearing everyone elses. That isn't
3233 * XXX so nice. I'd like to just reset this
3234 * XXX target, but if I cannot even get it's
3235 * XXX attention and finish selection to talk
3236 * XXX to it, there is not much more I can do.
3237 * XXX If we have a loaded bus we're going to
3238 * XXX spend the next second or so renegotiating
3239 * XXX for synchronous transfers.
3241 ESPLOG(("esp%d: STEP_ASEL for tgt %d\n",
3242 esp
->esp_id
, SCptr
->device
->id
));
3245 /* Arbitration won, target selected, went
3246 * to message out phase, sent one message
3247 * byte, then we stopped. ATN is asserted
3248 * on the SCSI bus and the target is still
3249 * there hanging on. This is a legal
3250 * sequence step if we gave the ESP a select
3253 * XXX See above, I could set the borken flag
3254 * XXX in the device struct and retry the
3255 * XXX command. But would that help for
3256 * XXX tagged capable targets?
3260 /* Arbitration won, target selected, maybe
3261 * sent the one message byte in message out
3262 * phase, but we did not go to command phase
3263 * in the end. Actually, we could have sent
3264 * only some of the message bytes if we tried
3265 * to send out the entire identify and tag
3266 * message using ESP_CMD_SA3.
3272 /* No, not the powerPC pinhead. Arbitration
3273 * won, all message bytes sent if we went to
3274 * message out phase, went to command phase
3275 * but only part of the command was sent.
3277 * XXX I've seen this, but usually in conjunction
3278 * XXX with a gross error which appears to have
3279 * XXX occurred between the time I told the
3280 * XXX ESP to arbitrate and when I got the
3281 * XXX interrupt. Could I have misloaded the
3282 * XXX command bytes into the fifo? Actually,
3283 * XXX I most likely missed a phase, and therefore
3284 * XXX went into never never land and didn't even
3285 * XXX know it. That was the old driver though.
3286 * XXX What is even more peculiar is that the ESP
3287 * XXX showed the proper function complete and
3288 * XXX bus service bits in the interrupt register.
3291 case ESP_STEP_FINI4
:
3292 case ESP_STEP_FINI5
:
3293 case ESP_STEP_FINI6
:
3294 case ESP_STEP_FINI7
:
3295 /* Account for the identify message */
3296 if (SCptr
->SCp
.phase
== in_slct_norm
)
3297 cmd_bytes_sent
-= 1;
3300 if (esp
->erev
!= fashme
)
3301 esp_cmd(esp
, ESP_CMD_NULL
);
3303 /* Be careful, we could really get fucked during synchronous
3304 * data transfers if we try to flush the fifo now.
3306 if ((esp
->erev
!= fashme
) && /* not a Happy Meal and... */
3307 !fcnt
&& /* Fifo is empty and... */
3308 /* either we are not doing synchronous transfers or... */
3309 (!esp_dev
->sync_max_offset
||
3310 /* We are not going into data in phase. */
3311 ((esp
->sreg
& ESP_STAT_PMASK
) != ESP_DIP
)))
3312 esp_cmd(esp
, ESP_CMD_FLUSH
); /* flush is safe */
3314 /* See how far we got if this is not a slow command. */
3315 if (!esp
->esp_slowcmd
) {
3316 if (cmd_bytes_sent
< 0)
3318 if (cmd_bytes_sent
!= SCptr
->cmd_len
) {
3319 /* Crapola, mark it as a slowcmd
3320 * so that we have some chance of
3321 * keeping the command alive with
3324 * XXX Actually, if we didn't send it all
3325 * XXX this means either we didn't set things
3326 * XXX up properly (driver bug) or the target
3327 * XXX or the ESP detected parity on one of
3328 * XXX the command bytes. This makes much
3329 * XXX more sense, and therefore this code
3330 * XXX should be changed to send out a
3331 * XXX parity error message or if the status
3332 * XXX register shows no parity error then
3333 * XXX just expect the target to bring the
3334 * XXX bus into message in phase so that it
3335 * XXX can send us the parity error message.
3338 esp
->esp_slowcmd
= 1;
3339 esp
->esp_scmdp
= &(SCptr
->cmnd
[cmd_bytes_sent
]);
3340 esp
->esp_scmdleft
= (SCptr
->cmd_len
- cmd_bytes_sent
);
3344 /* Now figure out where we went. */
3345 esp_advance_phase(SCptr
, in_the_dark
);
3346 return esp_do_phase_determine(esp
);
3349 /* Did the target even make it? */
3350 if (esp
->ireg
== ESP_INTR_DC
) {
3351 /* wheee... nobody there or they didn't like
3352 * what we told it to do, clean up.
3355 /* If anyone is off the bus, but working on
3356 * a command in the background for us, tell
3357 * the ESP to listen for them.
3359 if (esp
->disconnected_SC
)
3360 esp_cmd(esp
, ESP_CMD_ESEL
);
3362 if (((1<<SCptr
->device
->id
) & esp
->targets_present
) &&
3364 (esp
->cur_msgout
[0] == EXTENDED_MESSAGE
) &&
3365 (SCptr
->SCp
.phase
== in_slct_msg
||
3366 SCptr
->SCp
.phase
== in_slct_stop
)) {
3369 ESPLOG(("esp%d: Failed synchronous negotiation for target %d "
3370 "lun %d\n", esp
->esp_id
, SCptr
->device
->id
, SCptr
->device
->lun
));
3371 esp_dev
->sync_max_offset
= 0;
3372 esp_dev
->sync_min_period
= 0;
3373 esp_dev
->sync
= 1; /* so we don't negotiate again */
3375 /* Run the command again, this time though we
3376 * won't try to negotiate for synchronous transfers.
3378 * XXX I'd like to do something like send an
3379 * XXX INITIATOR_ERROR or ABORT message to the
3380 * XXX target to tell it, "Sorry I confused you,
3381 * XXX please come back and I will be nicer next
3382 * XXX time". But that requires having the target
3383 * XXX on the bus, and it has dropped BSY on us.
3385 esp
->current_SC
= NULL
;
3386 esp_advance_phase(SCptr
, not_issued
);
3387 prepend_SC(&esp
->issue_SC
, SCptr
);
3392 /* Ok, this is normal, this is what we see during boot
3393 * or whenever when we are scanning the bus for targets.
3394 * But first make sure that is really what is happening.
3396 if (((1<<SCptr
->device
->id
) & esp
->targets_present
)) {
3397 ESPLOG(("esp%d: Warning, live target %d not responding to "
3398 "selection.\n", esp
->esp_id
, SCptr
->device
->id
));
3400 /* This _CAN_ happen. The SCSI standard states that
3401 * the target is to _not_ respond to selection if
3402 * _it_ detects bad parity on the bus for any reason.
3403 * Therefore, we assume that if we've talked successfully
3404 * to this target before, bad parity is the problem.
3406 esp_done(esp
, (DID_PARITY
<< 16));
3408 /* Else, there really isn't anyone there. */
3409 ESPMISC(("esp: selection failure, maybe nobody there?\n"));
3410 ESPMISC(("esp: target %d lun %d\n",
3411 SCptr
->device
->id
, SCptr
->device
->lun
));
3412 esp_done(esp
, (DID_BAD_TARGET
<< 16));
3417 ESPLOG(("esp%d: Selection failure.\n", esp
->esp_id
));
3418 printk("esp%d: Currently -- ", esp
->esp_id
);
3419 esp_print_ireg(esp
->ireg
); printk(" ");
3420 esp_print_statreg(esp
->sreg
); printk(" ");
3421 esp_print_seqreg(esp
->seqreg
); printk("\n");
3422 printk("esp%d: New -- ", esp
->esp_id
);
3423 esp
->sreg
= sbus_readb(esp
->eregs
+ ESP_STATUS
);
3424 esp
->seqreg
= sbus_readb(esp
->eregs
+ ESP_SSTEP
);
3425 esp
->ireg
= sbus_readb(esp
->eregs
+ ESP_INTRPT
);
3426 esp_print_ireg(esp
->ireg
); printk(" ");
3427 esp_print_statreg(esp
->sreg
); printk(" ");
3428 esp_print_seqreg(esp
->seqreg
); printk("\n");
3429 ESPLOG(("esp%d: resetting bus\n", esp
->esp_id
));
3430 return do_reset_bus
; /* ugh... */
3433 /* Continue reading bytes for msgin phase. */
3434 static int esp_do_msgincont(struct esp
*esp
)
3436 if (esp
->ireg
& ESP_INTR_BSERV
) {
3437 /* in the right phase too? */
3438 if ((esp
->sreg
& ESP_STAT_PMASK
) == ESP_MIP
) {
3440 esp_cmd(esp
, ESP_CMD_TI
);
3441 esp_advance_phase(esp
->current_SC
, in_msgindone
);
3445 /* We changed phase but ESP shows bus service,
3446 * in this case it is most likely that we, the
3447 * hacker who has been up for 20hrs straight
3448 * staring at the screen, drowned in coffee
3449 * smelling like retched cigarette ashes
3450 * have miscoded something..... so, try to
3451 * recover as best we can.
3453 ESPLOG(("esp%d: message in mis-carriage.\n", esp
->esp_id
));
3455 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3456 return do_phase_determine
;
3459 static int check_singlebyte_msg(struct esp
*esp
)
3461 esp
->prevmsgin
= esp
->cur_msgin
[0];
3462 if (esp
->cur_msgin
[0] & 0x80) {
3464 ESPLOG(("esp%d: target sends identify amidst phases\n",
3466 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3468 } else if (((esp
->cur_msgin
[0] & 0xf0) == 0x20) ||
3469 (esp
->cur_msgin
[0] == EXTENDED_MESSAGE
)) {
3471 esp_advance_phase(esp
->current_SC
, in_msgincont
);
3474 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3475 switch (esp
->cur_msgin
[0]) {
3477 /* We don't want to hear about it. */
3478 ESPLOG(("esp%d: msg %02x which we don't know about\n", esp
->esp_id
,
3479 esp
->cur_msgin
[0]));
3480 return MESSAGE_REJECT
;
3483 ESPLOG(("esp%d: target %d sends a nop\n", esp
->esp_id
,
3484 esp
->current_SC
->device
->id
));
3487 case RESTORE_POINTERS
:
3488 /* In this case we might also have to backup the
3489 * "slow command" pointer. It is rare to get such
3490 * a save/restore pointer sequence so early in the
3491 * bus transition sequences, but cover it.
3493 if (esp
->esp_slowcmd
) {
3494 esp
->esp_scmdleft
= esp
->current_SC
->cmd_len
;
3495 esp
->esp_scmdp
= &esp
->current_SC
->cmnd
[0];
3497 esp_restore_pointers(esp
, esp
->current_SC
);
3501 esp_save_pointers(esp
, esp
->current_SC
);
3504 case COMMAND_COMPLETE
:
3506 /* Freeing the bus, let it go. */
3507 esp
->current_SC
->SCp
.phase
= in_freeing
;
3510 case MESSAGE_REJECT
:
3511 ESPMISC(("msg reject, "));
3512 if (esp
->prevmsgout
== EXTENDED_MESSAGE
) {
3513 struct esp_device
*esp_dev
= esp
->current_SC
->device
->hostdata
;
3515 /* Doesn't look like this target can
3516 * do synchronous or WIDE transfers.
3518 ESPSDTR(("got reject, was trying nego, clearing sync/WIDE\n"));
3521 esp_dev
->sync_min_period
= 0;
3522 esp_dev
->sync_max_offset
= 0;
3525 ESPMISC(("not sync nego, sending ABORT\n"));
3531 /* Target negotiates for synchronous transfers before we do, this
3532 * is legal although very strange. What is even funnier is that
3533 * the SCSI2 standard specifically recommends against targets doing
3534 * this because so many initiators cannot cope with this occurring.
3536 static int target_with_ants_in_pants(struct esp
*esp
,
3537 struct scsi_cmnd
*SCptr
,
3538 struct esp_device
*esp_dev
)
3540 if (esp_dev
->sync
|| SCptr
->device
->borken
) {
3541 /* sorry, no can do */
3542 ESPSDTR(("forcing to async, "));
3543 build_sync_nego_msg(esp
, 0, 0);
3546 ESPLOG(("esp%d: hoping for msgout\n", esp
->esp_id
));
3547 esp_advance_phase(SCptr
, in_the_dark
);
3548 return EXTENDED_MESSAGE
;
3551 /* Ok, we'll check them out... */
3555 static void sync_report(struct esp
*esp
)
3560 msg3
= esp
->cur_msgin
[3];
3561 msg4
= esp
->cur_msgin
[4];
3563 int hz
= 1000000000 / (msg3
* 4);
3564 int integer
= hz
/ 1000000;
3565 int fraction
= (hz
- (integer
* 1000000)) / 10000;
3566 if ((esp
->erev
== fashme
) &&
3567 (esp
->config3
[esp
->current_SC
->device
->id
] & ESP_CONFIG3_EWIDE
)) {
3571 } else if ((msg3
* 4) < 200) {
3574 type
= "synchronous";
3577 /* Do not transform this back into one big printk
3578 * again, it triggers a bug in our sparc64-gcc272
3579 * sibling call optimization. -DaveM
3581 ESPLOG((KERN_INFO
"esp%d: target %d ",
3582 esp
->esp_id
, esp
->current_SC
->device
->id
));
3583 ESPLOG(("[period %dns offset %d %d.%02dMHz ",
3584 (int) msg3
* 4, (int) msg4
,
3585 integer
, fraction
));
3586 ESPLOG(("%s SCSI%s]\n", type
,
3587 (((msg3
* 4) < 200) ? "-II" : "")));
3589 ESPLOG((KERN_INFO
"esp%d: target %d asynchronous\n",
3590 esp
->esp_id
, esp
->current_SC
->device
->id
));
3594 static int check_multibyte_msg(struct esp
*esp
)
3596 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
3597 struct esp_device
*esp_dev
= SCptr
->device
->hostdata
;
3599 int message_out
= 0;
3601 ESPSDTR(("chk multibyte msg: "));
3602 if (esp
->cur_msgin
[2] == EXTENDED_SDTR
) {
3603 int period
= esp
->cur_msgin
[3];
3604 int offset
= esp
->cur_msgin
[4];
3606 ESPSDTR(("is sync nego response, "));
3610 /* Target negotiates first! */
3611 ESPSDTR(("target jumps the gun, "));
3612 message_out
= EXTENDED_MESSAGE
; /* we must respond */
3613 rval
= target_with_ants_in_pants(esp
, SCptr
, esp_dev
);
3618 ESPSDTR(("examining sdtr, "));
3620 /* Offset cannot be larger than ESP fifo size. */
3622 ESPSDTR(("offset too big %2x, ", offset
));
3624 ESPSDTR(("sending back new offset\n"));
3625 build_sync_nego_msg(esp
, period
, offset
);
3626 return EXTENDED_MESSAGE
;
3629 if (offset
&& period
> esp
->max_period
) {
3630 /* Yeee, async for this slow device. */
3631 ESPSDTR(("period too long %2x, ", period
));
3632 build_sync_nego_msg(esp
, 0, 0);
3633 ESPSDTR(("hoping for msgout\n"));
3634 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3635 return EXTENDED_MESSAGE
;
3636 } else if (offset
&& period
< esp
->min_period
) {
3637 ESPSDTR(("period too short %2x, ", period
));
3638 period
= esp
->min_period
;
3639 if (esp
->erev
> esp236
)
3643 } else if (offset
) {
3646 ESPSDTR(("period is ok, "));
3647 tmp
= esp
->ccycle
/ 1000;
3648 regval
= (((period
<< 2) + tmp
- 1) / tmp
);
3649 if (regval
&& ((esp
->erev
== fas100a
||
3650 esp
->erev
== fas236
||
3651 esp
->erev
== fashme
))) {
3660 esp_dev
->sync_min_period
= (regval
& 0x1f);
3661 esp_dev
->sync_max_offset
= (offset
| esp
->radelay
);
3662 if (esp
->erev
== fas100a
|| esp
->erev
== fas236
|| esp
->erev
== fashme
) {
3663 if ((esp
->erev
== fas100a
) || (esp
->erev
== fashme
))
3664 bit
= ESP_CONFIG3_FAST
;
3666 bit
= ESP_CONFIG3_FSCSI
;
3668 /* On FAS366, if using fast-20 synchronous transfers
3669 * we need to make sure the REQ/ACK assert/deassert
3670 * control bits are clear.
3672 if (esp
->erev
== fashme
)
3673 esp_dev
->sync_max_offset
&= ~esp
->radelay
;
3674 esp
->config3
[SCptr
->device
->id
] |= bit
;
3676 esp
->config3
[SCptr
->device
->id
] &= ~bit
;
3678 esp
->prev_cfg3
= esp
->config3
[SCptr
->device
->id
];
3679 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
3681 esp
->prev_soff
= esp_dev
->sync_max_offset
;
3682 esp
->prev_stp
= esp_dev
->sync_min_period
;
3683 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
3684 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
3685 ESPSDTR(("soff=%2x stp=%2x cfg3=%2x\n",
3686 esp_dev
->sync_max_offset
,
3687 esp_dev
->sync_min_period
,
3688 esp
->config3
[SCptr
->device
->id
]));
3691 } else if (esp_dev
->sync_max_offset
) {
3694 /* back to async mode */
3695 ESPSDTR(("unaccaptable sync nego, forcing async\n"));
3696 esp_dev
->sync_max_offset
= 0;
3697 esp_dev
->sync_min_period
= 0;
3700 sbus_writeb(esp
->prev_soff
, esp
->eregs
+ ESP_SOFF
);
3701 sbus_writeb(esp
->prev_stp
, esp
->eregs
+ ESP_STP
);
3702 if (esp
->erev
== fas100a
|| esp
->erev
== fas236
|| esp
->erev
== fashme
) {
3703 if ((esp
->erev
== fas100a
) || (esp
->erev
== fashme
))
3704 bit
= ESP_CONFIG3_FAST
;
3706 bit
= ESP_CONFIG3_FSCSI
;
3707 esp
->config3
[SCptr
->device
->id
] &= ~bit
;
3708 esp
->prev_cfg3
= esp
->config3
[SCptr
->device
->id
];
3709 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
3715 ESPSDTR(("chk multibyte msg: sync is known, "));
3719 ESPLOG(("esp%d: sending sdtr back, hoping for msgout\n",
3721 build_sync_nego_msg(esp
, period
, offset
);
3722 esp_advance_phase(SCptr
, in_the_dark
);
3723 return EXTENDED_MESSAGE
;
3726 ESPSDTR(("returning zero\n"));
3727 esp_advance_phase(SCptr
, in_the_dark
); /* ...or else! */
3729 } else if (esp
->cur_msgin
[2] == EXTENDED_WDTR
) {
3730 int size
= 8 << esp
->cur_msgin
[3];
3733 if (esp
->erev
!= fashme
) {
3734 ESPLOG(("esp%d: AIEEE wide msg received and not HME.\n",
3736 message_out
= MESSAGE_REJECT
;
3737 } else if (size
> 16) {
3738 ESPLOG(("esp%d: AIEEE wide transfer for %d size "
3739 "not supported.\n", esp
->esp_id
, size
));
3740 message_out
= MESSAGE_REJECT
;
3742 /* Things look good; let's see what we got. */
3744 /* Set config 3 register for this target. */
3745 esp
->config3
[SCptr
->device
->id
] |= ESP_CONFIG3_EWIDE
;
3747 /* Just make sure it was one byte sized. */
3749 ESPLOG(("esp%d: Aieee, wide nego of %d size.\n",
3750 esp
->esp_id
, size
));
3751 message_out
= MESSAGE_REJECT
;
3754 /* Pure paranoia. */
3755 esp
->config3
[SCptr
->device
->id
] &= ~(ESP_CONFIG3_EWIDE
);
3757 esp
->prev_cfg3
= esp
->config3
[SCptr
->device
->id
];
3758 sbus_writeb(esp
->prev_cfg3
, esp
->eregs
+ ESP_CFG3
);
3760 /* Regardless, next try for sync transfers. */
3761 build_sync_nego_msg(esp
, esp
->sync_defp
, 15);
3764 message_out
= EXTENDED_MESSAGE
;
3766 } else if (esp
->cur_msgin
[2] == EXTENDED_MODIFY_DATA_POINTER
) {
3767 ESPLOG(("esp%d: rejecting modify data ptr msg\n", esp
->esp_id
));
3768 message_out
= MESSAGE_REJECT
;
3771 esp_advance_phase(SCptr
, in_the_dark
);
3775 static int esp_do_msgindone(struct esp
*esp
)
3777 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
3778 int message_out
= 0, it
= 0, rval
;
3780 rval
= skipahead1(esp
, SCptr
, in_msgin
, in_msgindone
);
3783 if (SCptr
->SCp
.sent_command
!= in_status
) {
3784 if (!(esp
->ireg
& ESP_INTR_DC
)) {
3785 if (esp
->msgin_len
&& (esp
->sreg
& ESP_STAT_PERR
)) {
3786 message_out
= MSG_PARITY_ERROR
;
3787 esp_cmd(esp
, ESP_CMD_FLUSH
);
3788 } else if (esp
->erev
!= fashme
&&
3789 (it
= (sbus_readb(esp
->eregs
+ ESP_FFLAGS
) & ESP_FF_FBYTES
)) != 1) {
3790 /* We certainly dropped the ball somewhere. */
3791 message_out
= INITIATOR_ERROR
;
3792 esp_cmd(esp
, ESP_CMD_FLUSH
);
3793 } else if (!esp
->msgin_len
) {
3794 if (esp
->erev
== fashme
)
3795 it
= esp
->hme_fifo_workaround_buffer
[0];
3797 it
= sbus_readb(esp
->eregs
+ ESP_FDATA
);
3798 esp_advance_phase(SCptr
, in_msgincont
);
3800 /* it is ok and we want it */
3801 if (esp
->erev
== fashme
)
3802 it
= esp
->cur_msgin
[esp
->msgin_ctr
] =
3803 esp
->hme_fifo_workaround_buffer
[0];
3805 it
= esp
->cur_msgin
[esp
->msgin_ctr
] =
3806 sbus_readb(esp
->eregs
+ ESP_FDATA
);
3810 esp_advance_phase(SCptr
, in_the_dark
);
3814 it
= esp
->cur_msgin
[0];
3816 if (!message_out
&& esp
->msgin_len
) {
3817 if (esp
->msgin_ctr
< esp
->msgin_len
) {
3818 esp_advance_phase(SCptr
, in_msgincont
);
3819 } else if (esp
->msgin_len
== 1) {
3820 message_out
= check_singlebyte_msg(esp
);
3821 } else if (esp
->msgin_len
== 2) {
3822 if (esp
->cur_msgin
[0] == EXTENDED_MESSAGE
) {
3823 if ((it
+ 2) >= 15) {
3824 message_out
= MESSAGE_REJECT
;
3826 esp
->msgin_len
= (it
+ 2);
3827 esp_advance_phase(SCptr
, in_msgincont
);
3830 message_out
= MESSAGE_REJECT
; /* foo on you */
3833 message_out
= check_multibyte_msg(esp
);
3836 if (message_out
< 0) {
3837 return -message_out
;
3838 } else if (message_out
) {
3839 if (((message_out
!= 1) &&
3840 ((message_out
< 0x20) || (message_out
& 0x80))))
3841 esp
->msgout_len
= 1;
3842 esp
->cur_msgout
[0] = message_out
;
3843 esp_cmd(esp
, ESP_CMD_SATN
);
3844 esp_advance_phase(SCptr
, in_the_dark
);
3847 esp
->sreg
= sbus_readb(esp
->eregs
+ ESP_STATUS
);
3848 esp
->sreg
&= ~(ESP_STAT_INTR
);
3849 if ((esp
->sreg
& (ESP_STAT_PMSG
|ESP_STAT_PCD
)) == (ESP_STAT_PMSG
|ESP_STAT_PCD
))
3850 esp_cmd(esp
, ESP_CMD_MOK
);
3851 if ((SCptr
->SCp
.sent_command
== in_msgindone
) &&
3852 (SCptr
->SCp
.phase
== in_freeing
))
3853 return esp_do_freebus(esp
);
3857 static int esp_do_cmdbegin(struct esp
*esp
)
3859 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
3861 esp_advance_phase(SCptr
, in_cmdend
);
3862 if (esp
->erev
== fashme
) {
3863 u32 tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
);
3866 for (i
= 0; i
< esp
->esp_scmdleft
; i
++)
3867 esp
->esp_command
[i
] = *esp
->esp_scmdp
++;
3868 esp
->esp_scmdleft
= 0;
3869 esp_cmd(esp
, ESP_CMD_FLUSH
);
3870 esp_setcount(esp
->eregs
, i
, 1);
3871 esp_cmd(esp
, (ESP_CMD_DMA
| ESP_CMD_TI
));
3872 tmp
|= (DMA_SCSI_DISAB
| DMA_ENABLE
);
3873 tmp
&= ~(DMA_ST_WRITE
);
3874 sbus_writel(i
, esp
->dregs
+ DMA_COUNT
);
3875 sbus_writel(esp
->esp_command_dvma
, esp
->dregs
+ DMA_ADDR
);
3876 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
3880 esp_cmd(esp
, ESP_CMD_FLUSH
);
3881 tmp
= *esp
->esp_scmdp
++;
3882 esp
->esp_scmdleft
--;
3883 sbus_writeb(tmp
, esp
->eregs
+ ESP_FDATA
);
3884 esp_cmd(esp
, ESP_CMD_TI
);
3889 static int esp_do_cmddone(struct esp
*esp
)
3891 if (esp
->erev
== fashme
)
3892 dma_invalidate(esp
);
3894 esp_cmd(esp
, ESP_CMD_NULL
);
3896 if (esp
->ireg
& ESP_INTR_BSERV
) {
3897 esp_advance_phase(esp
->current_SC
, in_the_dark
);
3898 return esp_do_phase_determine(esp
);
3901 ESPLOG(("esp%d: in do_cmddone() but didn't get BSERV interrupt.\n",
3903 return do_reset_bus
;
3906 static int esp_do_msgout(struct esp
*esp
)
3908 esp_cmd(esp
, ESP_CMD_FLUSH
);
3909 switch (esp
->msgout_len
) {
3911 if (esp
->erev
== fashme
)
3912 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 1);
3914 sbus_writeb(esp
->cur_msgout
[0], esp
->eregs
+ ESP_FDATA
);
3916 esp_cmd(esp
, ESP_CMD_TI
);
3920 esp
->esp_command
[0] = esp
->cur_msgout
[0];
3921 esp
->esp_command
[1] = esp
->cur_msgout
[1];
3923 if (esp
->erev
== fashme
) {
3924 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 2);
3925 esp_cmd(esp
, ESP_CMD_TI
);
3927 dma_setup(esp
, esp
->esp_command_dvma
, 2, 0);
3928 esp_setcount(esp
->eregs
, 2, 0);
3929 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
3934 esp
->esp_command
[0] = esp
->cur_msgout
[0];
3935 esp
->esp_command
[1] = esp
->cur_msgout
[1];
3936 esp
->esp_command
[2] = esp
->cur_msgout
[2];
3937 esp
->esp_command
[3] = esp
->cur_msgout
[3];
3940 if (esp
->erev
== fashme
) {
3941 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 4);
3942 esp_cmd(esp
, ESP_CMD_TI
);
3944 dma_setup(esp
, esp
->esp_command_dvma
, 4, 0);
3945 esp_setcount(esp
->eregs
, 4, 0);
3946 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
3951 esp
->esp_command
[0] = esp
->cur_msgout
[0];
3952 esp
->esp_command
[1] = esp
->cur_msgout
[1];
3953 esp
->esp_command
[2] = esp
->cur_msgout
[2];
3954 esp
->esp_command
[3] = esp
->cur_msgout
[3];
3955 esp
->esp_command
[4] = esp
->cur_msgout
[4];
3958 if (esp
->erev
== fashme
) {
3959 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 5);
3960 esp_cmd(esp
, ESP_CMD_TI
);
3962 dma_setup(esp
, esp
->esp_command_dvma
, 5, 0);
3963 esp_setcount(esp
->eregs
, 5, 0);
3964 esp_cmd(esp
, ESP_CMD_DMA
| ESP_CMD_TI
);
3970 ESPMISC(("bogus msgout sending NOP\n"));
3971 esp
->cur_msgout
[0] = NOP
;
3973 if (esp
->erev
== fashme
) {
3974 hme_fifo_push(esp
, &esp
->cur_msgout
[0], 1);
3976 sbus_writeb(esp
->cur_msgout
[0], esp
->eregs
+ ESP_FDATA
);
3979 esp
->msgout_len
= 1;
3980 esp_cmd(esp
, ESP_CMD_TI
);
3984 esp_advance_phase(esp
->current_SC
, in_msgoutdone
);
3988 static int esp_do_msgoutdone(struct esp
*esp
)
3990 if (esp
->msgout_len
> 1) {
3991 /* XXX HME/FAS ATN deassert workaround required,
3992 * XXX no DMA flushing, only possible ESP_CMD_FLUSH
3993 * XXX to kill the fifo.
3995 if (esp
->erev
!= fashme
) {
3998 while ((tmp
= sbus_readl(esp
->dregs
+ DMA_CSR
)) & DMA_PEND_READ
)
4001 sbus_writel(tmp
, esp
->dregs
+ DMA_CSR
);
4002 dma_invalidate(esp
);
4004 esp_cmd(esp
, ESP_CMD_FLUSH
);
4007 if (!(esp
->ireg
& ESP_INTR_DC
)) {
4008 if (esp
->erev
!= fashme
)
4009 esp_cmd(esp
, ESP_CMD_NULL
);
4010 switch (esp
->sreg
& ESP_STAT_PMASK
) {
4012 /* whoops, parity error */
4013 ESPLOG(("esp%d: still in msgout, parity error assumed\n",
4015 if (esp
->msgout_len
> 1)
4016 esp_cmd(esp
, ESP_CMD_SATN
);
4017 esp_advance_phase(esp
->current_SC
, in_msgout
);
4024 /* Happy Meal fifo is touchy... */
4025 if ((esp
->erev
!= fashme
) &&
4027 !(((struct esp_device
*)esp
->current_SC
->device
->hostdata
)->sync_max_offset
))
4028 esp_cmd(esp
, ESP_CMD_FLUSH
);
4033 ESPLOG(("esp%d: disconnect, resetting bus\n", esp
->esp_id
));
4034 return do_reset_bus
;
4037 /* If we sent out a synchronous negotiation message, update
4040 if (esp
->cur_msgout
[2] == EXTENDED_MESSAGE
&&
4041 esp
->cur_msgout
[4] == EXTENDED_SDTR
) {
4042 esp
->snip
= 1; /* anal retentiveness... */
4045 esp
->prevmsgout
= esp
->cur_msgout
[0];
4046 esp
->msgout_len
= 0;
4047 esp_advance_phase(esp
->current_SC
, in_the_dark
);
4048 return esp_do_phase_determine(esp
);
4051 static int esp_bus_unexpected(struct esp
*esp
)
4053 ESPLOG(("esp%d: command in weird state %2x\n",
4054 esp
->esp_id
, esp
->current_SC
->SCp
.phase
));
4055 return do_reset_bus
;
4058 static espfunc_t bus_vector
[] = {
4071 esp_do_phase_determine
,
4077 /* This is the second tier in our dual-level SCSI state machine. */
4078 static int esp_work_bus(struct esp
*esp
)
4080 struct scsi_cmnd
*SCptr
= esp
->current_SC
;
4083 ESPBUS(("esp_work_bus: "));
4085 ESPBUS(("reconnect\n"));
4086 return esp_do_reconnect(esp
);
4088 phase
= SCptr
->SCp
.phase
;
4089 if ((phase
& 0xf0) == in_phases_mask
)
4090 return bus_vector
[(phase
& 0x0f)](esp
);
4091 else if ((phase
& 0xf0) == in_slct_mask
)
4092 return esp_select_complete(esp
);
4094 return esp_bus_unexpected(esp
);
4097 static espfunc_t isvc_vector
[] = {
4099 esp_do_phase_determine
,
4105 /* Main interrupt handler for an esp adapter. */
4106 static void esp_handle(struct esp
*esp
)
4108 struct scsi_cmnd
*SCptr
;
4109 int what_next
= do_intr_end
;
4111 SCptr
= esp
->current_SC
;
4113 /* Check for errors. */
4114 esp
->sreg
= sbus_readb(esp
->eregs
+ ESP_STATUS
);
4115 esp
->sreg
&= (~ESP_STAT_INTR
);
4116 if (esp
->erev
== fashme
) {
4117 esp
->sreg2
= sbus_readb(esp
->eregs
+ ESP_STATUS2
);
4118 esp
->seqreg
= (sbus_readb(esp
->eregs
+ ESP_SSTEP
) & ESP_STEP_VBITS
);
4121 if (esp
->sreg
& (ESP_STAT_SPAM
)) {
4122 /* Gross error, could be due to one of:
4124 * - top of fifo overwritten, could be because
4125 * we tried to do a synchronous transfer with
4126 * an offset greater than ESP fifo size
4128 * - top of command register overwritten
4130 * - DMA setup to go in one direction, SCSI
4131 * bus points in the other, whoops
4133 * - weird phase change during asynchronous
4134 * data phase while we are initiator
4136 ESPLOG(("esp%d: Gross error sreg=%2x\n", esp
->esp_id
, esp
->sreg
));
4138 /* If a command is live on the bus we cannot safely
4139 * reset the bus, so we'll just let the pieces fall
4140 * where they may. Here we are hoping that the
4141 * target will be able to cleanly go away soon
4142 * so we can safely reset things.
4145 ESPLOG(("esp%d: No current cmd during gross error, "
4146 "resetting bus\n", esp
->esp_id
));
4147 what_next
= do_reset_bus
;
4152 if (sbus_readl(esp
->dregs
+ DMA_CSR
) & DMA_HNDL_ERROR
) {
4153 /* A DMA gate array error. Here we must
4154 * be seeing one of two things. Either the
4155 * virtual to physical address translation
4156 * on the SBUS could not occur, else the
4157 * translation it did get pointed to a bogus
4160 ESPLOG(("esp%d: DMA error %08x\n", esp
->esp_id
,
4161 sbus_readl(esp
->dregs
+ DMA_CSR
)));
4163 /* DMA gate array itself must be reset to clear the
4168 what_next
= do_reset_bus
;
4172 esp
->ireg
= sbus_readb(esp
->eregs
+ ESP_INTRPT
); /* Unlatch intr reg */
4174 if (esp
->erev
== fashme
) {
4175 /* This chip is really losing. */
4178 ESPHME(("sreg2=%02x,", esp
->sreg2
));
4179 /* Must latch fifo before reading the interrupt
4180 * register else garbage ends up in the FIFO
4181 * which confuses the driver utterly.
4183 if (!(esp
->sreg2
& ESP_STAT2_FEMPTY
) ||
4184 (esp
->sreg2
& ESP_STAT2_F1BYTE
)) {
4185 ESPHME(("fifo_workaround]"));
4188 ESPHME(("no_fifo_workaround]"));
4192 /* No current cmd is only valid at this point when there are
4193 * commands off the bus or we are trying a reset.
4195 if (!SCptr
&& !esp
->disconnected_SC
&& !(esp
->ireg
& ESP_INTR_SR
)) {
4196 /* Panic is safe, since current_SC is null. */
4197 ESPLOG(("esp%d: no command in esp_handle()\n", esp
->esp_id
));
4198 panic("esp_handle: current_SC == penguin within interrupt!");
4201 if (esp
->ireg
& (ESP_INTR_IC
)) {
4202 /* Illegal command fed to ESP. Outside of obvious
4203 * software bugs that could cause this, there is
4204 * a condition with esp100 where we can confuse the
4205 * ESP into an erroneous illegal command interrupt
4206 * because it does not scrape the FIFO properly
4207 * for reselection. See esp100_reconnect_hwbug()
4208 * to see how we try very hard to avoid this.
4210 ESPLOG(("esp%d: invalid command\n", esp
->esp_id
));
4212 esp_dump_state(esp
);
4214 if (SCptr
!= NULL
) {
4215 /* Devices with very buggy firmware can drop BSY
4216 * during a scatter list interrupt when using sync
4217 * mode transfers. We continue the transfer as
4218 * expected, the target drops the bus, the ESP
4219 * gets confused, and we get a illegal command
4220 * interrupt because the bus is in the disconnected
4221 * state now and ESP_CMD_TI is only allowed when
4222 * a nexus is alive on the bus.
4224 ESPLOG(("esp%d: Forcing async and disabling disconnect for "
4225 "target %d\n", esp
->esp_id
, SCptr
->device
->id
));
4226 SCptr
->device
->borken
= 1; /* foo on you */
4229 what_next
= do_reset_bus
;
4230 } else if (!(esp
->ireg
& ~(ESP_INTR_FDONE
| ESP_INTR_BSERV
| ESP_INTR_DC
))) {
4232 unsigned int phase
= SCptr
->SCp
.phase
;
4234 if (phase
& in_phases_mask
) {
4235 what_next
= esp_work_bus(esp
);
4236 } else if (phase
& in_slct_mask
) {
4237 what_next
= esp_select_complete(esp
);
4239 ESPLOG(("esp%d: interrupt for no good reason...\n",
4241 what_next
= do_intr_end
;
4244 ESPLOG(("esp%d: BSERV or FDONE or DC while SCptr==NULL\n",
4246 what_next
= do_reset_bus
;
4248 } else if (esp
->ireg
& ESP_INTR_SR
) {
4249 ESPLOG(("esp%d: SCSI bus reset interrupt\n", esp
->esp_id
));
4250 what_next
= do_reset_complete
;
4251 } else if (esp
->ireg
& (ESP_INTR_S
| ESP_INTR_SATN
)) {
4252 ESPLOG(("esp%d: AIEEE we have been selected by another initiator!\n",
4254 what_next
= do_reset_bus
;
4255 } else if (esp
->ireg
& ESP_INTR_RSEL
) {
4256 if (SCptr
== NULL
) {
4258 what_next
= esp_do_reconnect(esp
);
4259 } else if (SCptr
->SCp
.phase
& in_slct_mask
) {
4260 /* Only selection code knows how to clean
4263 ESPDISC(("Reselected during selection attempt\n"));
4264 what_next
= esp_select_complete(esp
);
4266 ESPLOG(("esp%d: Reselected while bus is busy\n",
4268 what_next
= do_reset_bus
;
4272 /* This is tier-one in our dual level SCSI state machine. */
4274 while (what_next
!= do_intr_end
) {
4275 if (what_next
>= do_phase_determine
&&
4276 what_next
< do_intr_end
) {
4277 what_next
= isvc_vector
[what_next
](esp
);
4279 /* state is completely lost ;-( */
4280 ESPLOG(("esp%d: interrupt engine loses state, resetting bus\n",
4282 what_next
= do_reset_bus
;
4287 /* Service only the ESP described by dev_id. */
4288 static irqreturn_t
esp_intr(int irq
, void *dev_id
, struct pt_regs
*pregs
)
4290 struct esp
*esp
= dev_id
;
4291 unsigned long flags
;
4293 spin_lock_irqsave(esp
->ehost
->host_lock
, flags
);
4294 if (ESP_IRQ_P(esp
->dregs
)) {
4295 ESP_INTSOFF(esp
->dregs
);
4297 ESPIRQ(("I[%d:%d](", smp_processor_id(), esp
->esp_id
));
4301 ESP_INTSON(esp
->dregs
);
4303 spin_unlock_irqrestore(esp
->ehost
->host_lock
, flags
);
4308 static int esp_slave_alloc(struct scsi_device
*SDptr
)
4310 struct esp_device
*esp_dev
=
4311 kmalloc(sizeof(struct esp_device
), GFP_ATOMIC
);
4315 memset(esp_dev
, 0, sizeof(struct esp_device
));
4316 SDptr
->hostdata
= esp_dev
;
4320 static void esp_slave_destroy(struct scsi_device
*SDptr
)
4322 struct esp
*esp
= (struct esp
*) SDptr
->host
->hostdata
;
4324 esp
->targets_present
&= ~(1 << SDptr
->id
);
4325 kfree(SDptr
->hostdata
);
4326 SDptr
->hostdata
= NULL
;
4329 static struct scsi_host_template esp_template
= {
4330 .module
= THIS_MODULE
,
4333 .slave_alloc
= esp_slave_alloc
,
4334 .slave_destroy
= esp_slave_destroy
,
4335 .queuecommand
= esp_queue
,
4336 .eh_abort_handler
= esp_abort
,
4337 .eh_bus_reset_handler
= esp_reset
,
4340 .sg_tablesize
= SG_ALL
,
4342 .use_clustering
= ENABLE_CLUSTERING
,
4344 .proc_info
= esp_proc_info
,
4348 static struct of_device_id esp_match
[] = {
4351 .data
= &esp_template
,
4355 .data
= &esp_template
,
4359 .data
= &esp_template
,
4363 MODULE_DEVICE_TABLE(of
, esp_match
);
4365 static struct of_platform_driver esp_sbus_driver
= {
4367 .match_table
= esp_match
,
4368 .probe
= esp_sbus_probe
,
4369 .remove
= __devexit_p(esp_sbus_remove
),
4373 static int __init
esp_init(void)
4376 return esp_sun4_probe(&esp_template
);
4378 return of_register_driver(&esp_sbus_driver
, &sbus_bus_type
);
4382 static void __exit
esp_exit(void)
4387 of_unregister_driver(&esp_sbus_driver
);
4391 MODULE_DESCRIPTION("ESP Sun SCSI driver");
4392 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
4393 MODULE_LICENSE("GPL");
4394 MODULE_VERSION(DRV_VERSION
);
4396 module_init(esp_init
);
4397 module_exit(esp_exit
);