1 /* -*- mode: c; c-basic-offset: 8 -*- */
3 /* NCR (or Symbios) 53c700 and 53c700-66 Driver
5 * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
6 **-----------------------------------------------------------------------------
8 ** This program is free software; you can redistribute it and/or modify
9 ** it under the terms of the GNU General Public License as published by
10 ** the Free Software Foundation; either version 2 of the License, or
11 ** (at your option) any later version.
13 ** This program is distributed in the hope that it will be useful,
14 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
15 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 ** GNU General Public License for more details.
18 ** You should have received a copy of the GNU General Public License
19 ** along with this program; if not, write to the Free Software
20 ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 **-----------------------------------------------------------------------------
27 * This driver is designed exclusively for these chips (virtually the
28 * earliest of the scripts engine chips). They need their own drivers
29 * because they are missing so many of the scripts and snazzy register
30 * features of their elder brothers (the 710, 720 and 770).
32 * The 700 is the lowliest of the line, it can only do async SCSI.
33 * The 700-66 can at least do synchronous SCSI up to 10MHz.
35 * The 700 chip has no host bus interface logic of its own. However,
36 * it is usually mapped to a location with well defined register
37 * offsets. Therefore, if you can determine the base address and the
38 * irq your board incorporating this chip uses, you can probably use
39 * this driver to run it (although you'll probably have to write a
40 * minimal wrapper for the purpose---see the NCR_D700 driver for
41 * details about how to do this).
46 * 1. Better statistics in the proc fs
48 * 2. Implement message queue (queues SCSI messages like commands) and make
49 * the abort and device reset functions use them.
56 * Fixed bad bug affecting tag starvation processing (previously the
57 * driver would hang the system if too many tags starved. Also fixed
58 * bad bug having to do with 10 byte command processing and REQUEST
59 * SENSE (the command would loop forever getting a transfer length
60 * mismatch in the CMD phase).
64 * Fixed scripts problem which caused certain devices (notably CDRWs)
65 * to hang on initial INQUIRY. Updated NCR_700_readl/writel to use
66 * __raw_readl/writel for parisc compatibility (Thomas
67 * Bogendoerfer). Added missing SCp->request_bufflen initialisation
68 * for sense requests (Ryan Bradetich).
72 * Following test of the 64 bit parisc kernel by Richard Hirst,
73 * several problems have now been corrected. Also adds support for
74 * consistent memory allocation.
78 * More Compatibility changes for 710 (now actually works). Enhanced
79 * support for odd clock speeds which constrain SDTR negotiations.
80 * correct cacheline separation for scsi messages and status for
81 * incoherent architectures. Use of the pci mapping functions on
82 * buffers to begin support for 64 bit drivers.
86 * Added support for the 53c710 chip (in 53c700 emulation mode only---no
87 * special 53c710 instructions or registers are used).
91 * More endianness/cache coherency changes.
93 * Better bad device handling (handles devices lying about tag
94 * queueing support and devices which fail to provide sense data on
95 * contingent allegiance conditions)
97 * Many thanks to Richard Hirst <rhirst@linuxcare.com> for patiently
98 * debugging this driver on the parisc architecture and suggesting
99 * many improvements and bug fixes.
101 * Thanks also go to Linuxcare Inc. for providing several PARISC
102 * machines for me to debug the driver on.
106 * Made the driver mem or io mapped; added endian invariance; added
107 * dma cache flushing operations for architectures which need it;
108 * added support for more varied clocking speeds.
112 * Initial modularisation from the D700. See NCR_D700.c for the rest of
115 #define NCR_700_VERSION "2.8"
117 #include <linux/config.h>
118 #include <linux/kernel.h>
119 #include <linux/types.h>
120 #include <linux/string.h>
121 #include <linux/ioport.h>
122 #include <linux/delay.h>
123 #include <linux/spinlock.h>
124 #include <linux/completion.h>
125 #include <linux/sched.h>
126 #include <linux/init.h>
127 #include <linux/proc_fs.h>
128 #include <linux/blkdev.h>
129 #include <linux/module.h>
130 #include <linux/interrupt.h>
132 #include <asm/system.h>
134 #include <asm/pgtable.h>
135 #include <asm/byteorder.h>
137 #include <scsi/scsi.h>
138 #include <scsi/scsi_cmnd.h>
139 #include <scsi/scsi_dbg.h>
140 #include <scsi/scsi_eh.h>
141 #include <scsi/scsi_host.h>
142 #include <scsi/scsi_tcq.h>
143 #include <scsi/scsi_transport.h>
144 #include <scsi/scsi_transport_spi.h>
148 /* NOTE: For 64 bit drivers there are points in the code where we use
149 * a non dereferenceable pointer to point to a structure in dma-able
150 * memory (which is 32 bits) so that we can use all of the structure
151 * operations but take the address at the end. This macro allows us
152 * to truncate the 64 bit pointer down to 32 bits without the compiler
154 #define to32bit(x) ((__u32)((unsigned long)(x)))
159 #define STATIC static
162 MODULE_AUTHOR("James Bottomley");
163 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
164 MODULE_LICENSE("GPL");
166 /* This is the script */
167 #include "53c700_d.h"
170 STATIC
int NCR_700_queuecommand(struct scsi_cmnd
*, void (*done
)(struct scsi_cmnd
*));
171 STATIC
int NCR_700_abort(struct scsi_cmnd
* SCpnt
);
172 STATIC
int NCR_700_bus_reset(struct scsi_cmnd
* SCpnt
);
173 STATIC
int NCR_700_dev_reset(struct scsi_cmnd
* SCpnt
);
174 STATIC
int NCR_700_host_reset(struct scsi_cmnd
* SCpnt
);
175 STATIC
void NCR_700_chip_setup(struct Scsi_Host
*host
);
176 STATIC
void NCR_700_chip_reset(struct Scsi_Host
*host
);
177 STATIC
int NCR_700_slave_configure(struct scsi_device
*SDpnt
);
178 STATIC
void NCR_700_slave_destroy(struct scsi_device
*SDpnt
);
179 static int NCR_700_change_queue_depth(struct scsi_device
*SDpnt
, int depth
);
180 static int NCR_700_change_queue_type(struct scsi_device
*SDpnt
, int depth
);
182 STATIC
struct device_attribute
*NCR_700_dev_attrs
[];
184 STATIC
struct scsi_transport_template
*NCR_700_transport_template
= NULL
;
186 static char *NCR_700_phase
[] = {
189 "before command phase",
190 "after command phase",
191 "after status phase",
192 "after data in phase",
193 "after data out phase",
197 static char *NCR_700_condition
[] = {
205 "REJECT_MSG RECEIVED",
206 "DISCONNECT_MSG RECEIVED",
212 static char *NCR_700_fatal_messages
[] = {
213 "unexpected message after reselection",
214 "still MSG_OUT after message injection",
215 "not MSG_IN after selection",
216 "Illegal message length received",
219 static char *NCR_700_SBCL_bits
[] = {
230 static char *NCR_700_SBCL_to_phase
[] = {
241 static __u8 NCR_700_SDTR_msg
[] = {
242 0x01, /* Extended message */
243 0x03, /* Extended message Length */
244 0x01, /* SDTR Extended message */
249 /* This translates the SDTR message offset and period to a value
250 * which can be loaded into the SXFER_REG.
252 * NOTE: According to SCSI-2, the true transfer period (in ns) is
253 * actually four times this period value */
255 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters
*hostdata
,
256 __u8 offset
, __u8 period
)
260 __u8 min_xferp
= (hostdata
->chip710
261 ? NCR_710_MIN_XFERP
: NCR_700_MIN_XFERP
);
262 __u8 max_offset
= (hostdata
->chip710
263 ? NCR_710_MAX_OFFSET
: NCR_700_MAX_OFFSET
);
268 if(period
< hostdata
->min_period
) {
269 printk(KERN_WARNING
"53c700: Period %dns is less than this chip's minimum, setting to %d\n", period
*4, NCR_700_SDTR_msg
[3]*4);
270 period
= hostdata
->min_period
;
272 XFERP
= (period
*4 * hostdata
->sync_clock
)/1000 - 4;
273 if(offset
> max_offset
) {
274 printk(KERN_WARNING
"53c700: Offset %d exceeds chip maximum, setting to %d\n",
278 if(XFERP
< min_xferp
) {
279 printk(KERN_WARNING
"53c700: XFERP %d is less than minium, setting to %d\n",
283 return (offset
& 0x0f) | (XFERP
& 0x07)<<4;
287 NCR_700_get_SXFER(struct scsi_device
*SDp
)
289 struct NCR_700_Host_Parameters
*hostdata
=
290 (struct NCR_700_Host_Parameters
*)SDp
->host
->hostdata
[0];
292 return NCR_700_offset_period_to_sxfer(hostdata
,
293 spi_offset(SDp
->sdev_target
),
294 spi_period(SDp
->sdev_target
));
298 NCR_700_detect(struct scsi_host_template
*tpnt
,
299 struct NCR_700_Host_Parameters
*hostdata
, struct device
*dev
)
301 dma_addr_t pScript
, pSlots
;
304 struct Scsi_Host
*host
;
305 static int banner
= 0;
308 if(tpnt
->sdev_attrs
== NULL
)
309 tpnt
->sdev_attrs
= NCR_700_dev_attrs
;
311 memory
= dma_alloc_noncoherent(hostdata
->dev
, TOTAL_MEM_SIZE
,
312 &pScript
, GFP_KERNEL
);
314 printk(KERN_ERR
"53c700: Failed to allocate memory for driver, detatching\n");
318 script
= (__u32
*)memory
;
319 hostdata
->msgin
= memory
+ MSGIN_OFFSET
;
320 hostdata
->msgout
= memory
+ MSGOUT_OFFSET
;
321 hostdata
->status
= memory
+ STATUS_OFFSET
;
322 /* all of these offsets are L1_CACHE_BYTES separated. It is fatal
323 * if this isn't sufficient separation to avoid dma flushing issues */
324 BUG_ON(!dma_is_consistent(pScript
) && L1_CACHE_BYTES
< dma_get_cache_alignment());
325 hostdata
->slots
= (struct NCR_700_command_slot
*)(memory
+ SLOTS_OFFSET
);
328 pSlots
= pScript
+ SLOTS_OFFSET
;
330 /* Fill in the missing routines from the host template */
331 tpnt
->queuecommand
= NCR_700_queuecommand
;
332 tpnt
->eh_abort_handler
= NCR_700_abort
;
333 tpnt
->eh_device_reset_handler
= NCR_700_dev_reset
;
334 tpnt
->eh_bus_reset_handler
= NCR_700_bus_reset
;
335 tpnt
->eh_host_reset_handler
= NCR_700_host_reset
;
336 tpnt
->can_queue
= NCR_700_COMMAND_SLOTS_PER_HOST
;
337 tpnt
->sg_tablesize
= NCR_700_SG_SEGMENTS
;
338 tpnt
->cmd_per_lun
= NCR_700_CMD_PER_LUN
;
339 tpnt
->use_clustering
= ENABLE_CLUSTERING
;
340 tpnt
->slave_configure
= NCR_700_slave_configure
;
341 tpnt
->slave_destroy
= NCR_700_slave_destroy
;
342 tpnt
->change_queue_depth
= NCR_700_change_queue_depth
;
343 tpnt
->change_queue_type
= NCR_700_change_queue_type
;
345 if(tpnt
->name
== NULL
)
346 tpnt
->name
= "53c700";
347 if(tpnt
->proc_name
== NULL
)
348 tpnt
->proc_name
= "53c700";
351 host
= scsi_host_alloc(tpnt
, 4);
354 memset(hostdata
->slots
, 0, sizeof(struct NCR_700_command_slot
)
355 * NCR_700_COMMAND_SLOTS_PER_HOST
);
356 for(j
= 0; j
< NCR_700_COMMAND_SLOTS_PER_HOST
; j
++) {
357 dma_addr_t offset
= (dma_addr_t
)((unsigned long)&hostdata
->slots
[j
].SG
[0]
358 - (unsigned long)&hostdata
->slots
[0].SG
[0]);
359 hostdata
->slots
[j
].pSG
= (struct NCR_700_SG_List
*)((unsigned long)(pSlots
+ offset
));
361 hostdata
->free_list
= &hostdata
->slots
[j
];
363 hostdata
->slots
[j
-1].ITL_forw
= &hostdata
->slots
[j
];
364 hostdata
->slots
[j
].state
= NCR_700_SLOT_FREE
;
367 for(j
= 0; j
< sizeof(SCRIPT
)/sizeof(SCRIPT
[0]); j
++) {
368 script
[j
] = bS_to_host(SCRIPT
[j
]);
371 /* adjust all labels to be bus physical */
372 for(j
= 0; j
< PATCHES
; j
++) {
373 script
[LABELPATCHES
[j
]] = bS_to_host(pScript
+ SCRIPT
[LABELPATCHES
[j
]]);
375 /* now patch up fixed addresses. */
376 script_patch_32(script
, MessageLocation
,
377 pScript
+ MSGOUT_OFFSET
);
378 script_patch_32(script
, StatusAddress
,
379 pScript
+ STATUS_OFFSET
);
380 script_patch_32(script
, ReceiveMsgAddress
,
381 pScript
+ MSGIN_OFFSET
);
383 hostdata
->script
= script
;
384 hostdata
->pScript
= pScript
;
385 dma_sync_single_for_device(hostdata
->dev
, pScript
, sizeof(SCRIPT
), DMA_TO_DEVICE
);
386 hostdata
->state
= NCR_700_HOST_FREE
;
387 hostdata
->cmd
= NULL
;
389 host
->max_lun
= NCR_700_MAX_LUNS
;
390 BUG_ON(NCR_700_transport_template
== NULL
);
391 host
->transportt
= NCR_700_transport_template
;
392 host
->unique_id
= hostdata
->base
;
393 host
->base
= hostdata
->base
;
394 hostdata
->eh_complete
= NULL
;
395 host
->hostdata
[0] = (unsigned long)hostdata
;
397 NCR_700_writeb(0xff, host
, CTEST9_REG
);
398 if(hostdata
->chip710
)
399 hostdata
->rev
= (NCR_700_readb(host
, CTEST8_REG
)>>4) & 0x0f;
401 hostdata
->rev
= (NCR_700_readb(host
, CTEST7_REG
)>>4) & 0x0f;
402 hostdata
->fast
= (NCR_700_readb(host
, CTEST9_REG
) == 0);
404 printk(KERN_NOTICE
"53c700: Version " NCR_700_VERSION
" By James.Bottomley@HansenPartnership.com\n");
407 printk(KERN_NOTICE
"scsi%d: %s rev %d %s\n", host
->host_no
,
408 hostdata
->chip710
? "53c710" :
409 (hostdata
->fast
? "53c700-66" : "53c700"),
410 hostdata
->rev
, hostdata
->differential
?
411 "(Differential)" : "");
413 NCR_700_chip_reset(host
);
415 if (scsi_add_host(host
, dev
)) {
416 dev_printk(KERN_ERR
, dev
, "53c700: scsi_add_host failed\n");
421 spi_signalling(host
) = hostdata
->differential
? SPI_SIGNAL_HVD
:
428 NCR_700_release(struct Scsi_Host
*host
)
430 struct NCR_700_Host_Parameters
*hostdata
=
431 (struct NCR_700_Host_Parameters
*)host
->hostdata
[0];
433 dma_free_noncoherent(hostdata
->dev
, TOTAL_MEM_SIZE
,
434 hostdata
->script
, hostdata
->pScript
);
439 NCR_700_identify(int can_disconnect
, __u8 lun
)
441 return IDENTIFY_BASE
|
442 ((can_disconnect
) ? 0x40 : 0) |
443 (lun
& NCR_700_LUN_MASK
);
447 * Function : static int data_residual (Scsi_Host *host)
449 * Purpose : return residual data count of what's in the chip. If you
450 * really want to know what this function is doing, it's almost a
451 * direct transcription of the algorithm described in the 53c710
452 * guide, except that the DBC and DFIFO registers are only 6 bits
455 * Inputs : host - SCSI host */
457 NCR_700_data_residual (struct Scsi_Host
*host
) {
458 struct NCR_700_Host_Parameters
*hostdata
=
459 (struct NCR_700_Host_Parameters
*)host
->hostdata
[0];
460 int count
, synchronous
= 0;
463 if(hostdata
->chip710
) {
464 count
= ((NCR_700_readb(host
, DFIFO_REG
) & 0x7f) -
465 (NCR_700_readl(host
, DBC_REG
) & 0x7f)) & 0x7f;
467 count
= ((NCR_700_readb(host
, DFIFO_REG
) & 0x3f) -
468 (NCR_700_readl(host
, DBC_REG
) & 0x3f)) & 0x3f;
472 synchronous
= NCR_700_readb(host
, SXFER_REG
) & 0x0f;
474 /* get the data direction */
475 ddir
= NCR_700_readb(host
, CTEST0_REG
) & 0x01;
480 count
+= (NCR_700_readb(host
, SSTAT2_REG
) & 0xf0) >> 4;
482 if (NCR_700_readb(host
, SSTAT1_REG
) & SIDL_REG_FULL
)
486 __u8 sstat
= NCR_700_readb(host
, SSTAT1_REG
);
487 if (sstat
& SODL_REG_FULL
)
489 if (synchronous
&& (sstat
& SODR_REG_FULL
))
494 printk("RESIDUAL IS %d (ddir %d)\n", count
, ddir
);
499 /* print out the SCSI wires and corresponding phase from the SBCL register
502 sbcl_to_string(__u8 sbcl
)
505 static char ret
[256];
510 strcat(ret
, NCR_700_SBCL_bits
[i
]);
512 strcat(ret
, NCR_700_SBCL_to_phase
[sbcl
& 0x07]);
517 bitmap_to_number(__u8 bitmap
)
521 for(i
=0; i
<8 && !(bitmap
&(1<<i
)); i
++)
526 /* Pull a slot off the free list */
527 STATIC
struct NCR_700_command_slot
*
528 find_empty_slot(struct NCR_700_Host_Parameters
*hostdata
)
530 struct NCR_700_command_slot
*slot
= hostdata
->free_list
;
534 if(hostdata
->command_slot_count
!= NCR_700_COMMAND_SLOTS_PER_HOST
)
535 printk(KERN_ERR
"SLOTS FULL, but count is %d, should be %d\n", hostdata
->command_slot_count
, NCR_700_COMMAND_SLOTS_PER_HOST
);
539 if(slot
->state
!= NCR_700_SLOT_FREE
)
541 printk(KERN_ERR
"BUSY SLOT ON FREE LIST!!!\n");
544 hostdata
->free_list
= slot
->ITL_forw
;
545 slot
->ITL_forw
= NULL
;
548 /* NOTE: set the state to busy here, not queued, since this
549 * indicates the slot is in use and cannot be run by the IRQ
550 * finish routine. If we cannot queue the command when it
551 * is properly build, we then change to NCR_700_SLOT_QUEUED */
552 slot
->state
= NCR_700_SLOT_BUSY
;
553 hostdata
->command_slot_count
++;
559 free_slot(struct NCR_700_command_slot
*slot
,
560 struct NCR_700_Host_Parameters
*hostdata
)
562 if((slot
->state
& NCR_700_SLOT_MASK
) != NCR_700_SLOT_MAGIC
) {
563 printk(KERN_ERR
"53c700: SLOT %p is not MAGIC!!!\n", slot
);
565 if(slot
->state
== NCR_700_SLOT_FREE
) {
566 printk(KERN_ERR
"53c700: SLOT %p is FREE!!!\n", slot
);
569 slot
->resume_offset
= 0;
571 slot
->state
= NCR_700_SLOT_FREE
;
572 slot
->ITL_forw
= hostdata
->free_list
;
573 hostdata
->free_list
= slot
;
574 hostdata
->command_slot_count
--;
578 /* This routine really does very little. The command is indexed on
579 the ITL and (if tagged) the ITLQ lists in _queuecommand */
581 save_for_reselection(struct NCR_700_Host_Parameters
*hostdata
,
582 struct scsi_cmnd
*SCp
, __u32 dsp
)
584 /* Its just possible that this gets executed twice */
586 struct NCR_700_command_slot
*slot
=
587 (struct NCR_700_command_slot
*)SCp
->host_scribble
;
589 slot
->resume_offset
= dsp
;
591 hostdata
->state
= NCR_700_HOST_FREE
;
592 hostdata
->cmd
= NULL
;
596 NCR_700_unmap(struct NCR_700_Host_Parameters
*hostdata
, struct scsi_cmnd
*SCp
,
597 struct NCR_700_command_slot
*slot
)
599 if(SCp
->sc_data_direction
!= DMA_NONE
&&
600 SCp
->sc_data_direction
!= DMA_BIDIRECTIONAL
) {
602 dma_unmap_sg(hostdata
->dev
, SCp
->buffer
,
603 SCp
->use_sg
, SCp
->sc_data_direction
);
605 dma_unmap_single(hostdata
->dev
, slot
->dma_handle
,
606 SCp
->request_bufflen
,
607 SCp
->sc_data_direction
);
613 NCR_700_scsi_done(struct NCR_700_Host_Parameters
*hostdata
,
614 struct scsi_cmnd
*SCp
, int result
)
616 hostdata
->state
= NCR_700_HOST_FREE
;
617 hostdata
->cmd
= NULL
;
620 struct NCR_700_command_slot
*slot
=
621 (struct NCR_700_command_slot
*)SCp
->host_scribble
;
623 NCR_700_unmap(hostdata
, SCp
, slot
);
624 dma_unmap_single(hostdata
->dev
, slot
->pCmd
,
625 sizeof(SCp
->cmnd
), DMA_TO_DEVICE
);
626 if(SCp
->cmnd
[0] == REQUEST_SENSE
&& SCp
->cmnd
[6] == NCR_700_INTERNAL_SENSE_MAGIC
) {
628 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
629 SCp
, SCp
->cmnd
[7], result
);
630 scsi_print_sense("53c700", SCp
);
633 /* restore the old result if the request sense was
636 result
= SCp
->cmnd
[7];
637 /* now restore the original command */
638 memcpy((void *) SCp
->cmnd
, (void *) SCp
->data_cmnd
,
639 sizeof(SCp
->data_cmnd
));
640 SCp
->request_buffer
= SCp
->buffer
;
641 SCp
->request_bufflen
= SCp
->bufflen
;
642 SCp
->use_sg
= SCp
->old_use_sg
;
643 SCp
->cmd_len
= SCp
->old_cmd_len
;
644 SCp
->sc_data_direction
= SCp
->sc_old_data_direction
;
645 SCp
->underflow
= SCp
->old_underflow
;
648 free_slot(slot
, hostdata
);
650 if(NCR_700_get_depth(SCp
->device
) == 0 ||
651 NCR_700_get_depth(SCp
->device
) > SCp
->device
->queue_depth
)
652 printk(KERN_ERR
"Invalid depth in NCR_700_scsi_done(): %d\n",
653 NCR_700_get_depth(SCp
->device
));
654 #endif /* NCR_700_DEBUG */
655 NCR_700_set_depth(SCp
->device
, NCR_700_get_depth(SCp
->device
) - 1);
657 SCp
->host_scribble
= NULL
;
658 SCp
->result
= result
;
661 printk(KERN_ERR
"53c700: SCSI DONE HAS NULL SCp\n");
667 NCR_700_internal_bus_reset(struct Scsi_Host
*host
)
670 NCR_700_writeb(ASSERT_RST
, host
, SCNTL1_REG
);
672 NCR_700_writeb(0, host
, SCNTL1_REG
);
677 NCR_700_chip_setup(struct Scsi_Host
*host
)
679 struct NCR_700_Host_Parameters
*hostdata
=
680 (struct NCR_700_Host_Parameters
*)host
->hostdata
[0];
681 __u32 dcntl_extra
= 0;
683 __u8 min_xferp
= (hostdata
->chip710
? NCR_710_MIN_XFERP
: NCR_700_MIN_XFERP
);
685 if(hostdata
->chip710
) {
686 __u8 burst_disable
= hostdata
->burst_disable
688 dcntl_extra
= COMPAT_700_MODE
;
690 NCR_700_writeb(dcntl_extra
, host
, DCNTL_REG
);
691 NCR_700_writeb(BURST_LENGTH_8
| hostdata
->dmode_extra
,
692 host
, DMODE_710_REG
);
693 NCR_700_writeb(burst_disable
| (hostdata
->differential
?
694 DIFF
: 0), host
, CTEST7_REG
);
695 NCR_700_writeb(BTB_TIMER_DISABLE
, host
, CTEST0_REG
);
696 NCR_700_writeb(FULL_ARBITRATION
| ENABLE_PARITY
| PARITY
697 | AUTO_ATN
, host
, SCNTL0_REG
);
699 NCR_700_writeb(BURST_LENGTH_8
| hostdata
->dmode_extra
,
700 host
, DMODE_700_REG
);
701 NCR_700_writeb(hostdata
->differential
?
702 DIFF
: 0, host
, CTEST7_REG
);
704 /* this is for 700-66, does nothing on 700 */
705 NCR_700_writeb(LAST_DIS_ENBL
| ENABLE_ACTIVE_NEGATION
706 | GENERATE_RECEIVE_PARITY
, host
,
709 NCR_700_writeb(FULL_ARBITRATION
| ENABLE_PARITY
710 | PARITY
| AUTO_ATN
, host
, SCNTL0_REG
);
714 NCR_700_writeb(1 << host
->this_id
, host
, SCID_REG
);
715 NCR_700_writeb(0, host
, SBCL_REG
);
716 NCR_700_writeb(ASYNC_OPERATION
, host
, SXFER_REG
);
718 NCR_700_writeb(PHASE_MM_INT
| SEL_TIMEOUT_INT
| GROSS_ERR_INT
| UX_DISC_INT
719 | RST_INT
| PAR_ERR_INT
| SELECT_INT
, host
, SIEN_REG
);
721 NCR_700_writeb(ABORT_INT
| INT_INST_INT
| ILGL_INST_INT
, host
, DIEN_REG
);
722 NCR_700_writeb(ENABLE_SELECT
, host
, SCNTL1_REG
);
723 if(hostdata
->clock
> 75) {
724 printk(KERN_ERR
"53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata
->clock
);
725 /* do the best we can, but the async clock will be out
726 * of spec: sync divider 2, async divider 3 */
727 DEBUG(("53c700: sync 2 async 3\n"));
728 NCR_700_writeb(SYNC_DIV_2_0
, host
, SBCL_REG
);
729 NCR_700_writeb(ASYNC_DIV_3_0
| dcntl_extra
, host
, DCNTL_REG
);
730 hostdata
->sync_clock
= hostdata
->clock
/2;
731 } else if(hostdata
->clock
> 50 && hostdata
->clock
<= 75) {
732 /* sync divider 1.5, async divider 3 */
733 DEBUG(("53c700: sync 1.5 async 3\n"));
734 NCR_700_writeb(SYNC_DIV_1_5
, host
, SBCL_REG
);
735 NCR_700_writeb(ASYNC_DIV_3_0
| dcntl_extra
, host
, DCNTL_REG
);
736 hostdata
->sync_clock
= hostdata
->clock
*2;
737 hostdata
->sync_clock
/= 3;
739 } else if(hostdata
->clock
> 37 && hostdata
->clock
<= 50) {
740 /* sync divider 1, async divider 2 */
741 DEBUG(("53c700: sync 1 async 2\n"));
742 NCR_700_writeb(SYNC_DIV_1_0
, host
, SBCL_REG
);
743 NCR_700_writeb(ASYNC_DIV_2_0
| dcntl_extra
, host
, DCNTL_REG
);
744 hostdata
->sync_clock
= hostdata
->clock
;
745 } else if(hostdata
->clock
> 25 && hostdata
->clock
<=37) {
746 /* sync divider 1, async divider 1.5 */
747 DEBUG(("53c700: sync 1 async 1.5\n"));
748 NCR_700_writeb(SYNC_DIV_1_0
, host
, SBCL_REG
);
749 NCR_700_writeb(ASYNC_DIV_1_5
| dcntl_extra
, host
, DCNTL_REG
);
750 hostdata
->sync_clock
= hostdata
->clock
;
752 DEBUG(("53c700: sync 1 async 1\n"));
753 NCR_700_writeb(SYNC_DIV_1_0
, host
, SBCL_REG
);
754 NCR_700_writeb(ASYNC_DIV_1_0
| dcntl_extra
, host
, DCNTL_REG
);
755 /* sync divider 1, async divider 1 */
756 hostdata
->sync_clock
= hostdata
->clock
;
758 /* Calculate the actual minimum period that can be supported
759 * by our synchronous clock speed. See the 710 manual for
760 * exact details of this calculation which is based on a
761 * setting of the SXFER register */
762 min_period
= 1000*(4+min_xferp
)/(4*hostdata
->sync_clock
);
763 hostdata
->min_period
= NCR_700_MIN_PERIOD
;
764 if(min_period
> NCR_700_MIN_PERIOD
)
765 hostdata
->min_period
= min_period
;
769 NCR_700_chip_reset(struct Scsi_Host
*host
)
771 struct NCR_700_Host_Parameters
*hostdata
=
772 (struct NCR_700_Host_Parameters
*)host
->hostdata
[0];
773 if(hostdata
->chip710
) {
774 NCR_700_writeb(SOFTWARE_RESET_710
, host
, ISTAT_REG
);
777 NCR_700_writeb(0, host
, ISTAT_REG
);
779 NCR_700_writeb(SOFTWARE_RESET
, host
, DCNTL_REG
);
782 NCR_700_writeb(0, host
, DCNTL_REG
);
787 NCR_700_chip_setup(host
);
790 /* The heart of the message processing engine is that the instruction
791 * immediately after the INT is the normal case (and so must be CLEAR
792 * ACK). If we want to do something else, we call that routine in
793 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
794 * ACK) so that the routine returns correctly to resume its activity
797 process_extended_message(struct Scsi_Host
*host
,
798 struct NCR_700_Host_Parameters
*hostdata
,
799 struct scsi_cmnd
*SCp
, __u32 dsp
, __u32 dsps
)
801 __u32 resume_offset
= dsp
, temp
= dsp
+ 8;
802 __u8 pun
= 0xff, lun
= 0xff;
805 pun
= SCp
->device
->id
;
806 lun
= SCp
->device
->lun
;
809 switch(hostdata
->msgin
[2]) {
811 if(SCp
!= NULL
&& NCR_700_is_flag_set(SCp
->device
, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION
)) {
812 struct scsi_target
*starget
= SCp
->device
->sdev_target
;
813 __u8 period
= hostdata
->msgin
[3];
814 __u8 offset
= hostdata
->msgin
[4];
816 if(offset
== 0 || period
== 0) {
821 spi_offset(starget
) = offset
;
822 spi_period(starget
) = period
;
824 if(NCR_700_is_flag_set(SCp
->device
, NCR_700_DEV_PRINT_SYNC_NEGOTIATION
)) {
825 spi_display_xfer_agreement(starget
);
826 NCR_700_clear_flag(SCp
->device
, NCR_700_DEV_PRINT_SYNC_NEGOTIATION
);
829 NCR_700_set_flag(SCp
->device
, NCR_700_DEV_NEGOTIATED_SYNC
);
830 NCR_700_clear_flag(SCp
->device
, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION
);
832 NCR_700_writeb(NCR_700_get_SXFER(SCp
->device
),
836 /* SDTR message out of the blue, reject it */
837 printk(KERN_WARNING
"scsi%d Unexpected SDTR msg\n",
839 hostdata
->msgout
[0] = A_REJECT_MSG
;
840 dma_cache_sync(hostdata
->msgout
, 1, DMA_TO_DEVICE
);
841 script_patch_16(hostdata
->script
, MessageCount
, 1);
842 /* SendMsgOut returns, so set up the return
844 resume_offset
= hostdata
->pScript
+ Ent_SendMessageWithATN
;
849 printk(KERN_INFO
"scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
850 host
->host_no
, pun
, lun
);
851 hostdata
->msgout
[0] = A_REJECT_MSG
;
852 dma_cache_sync(hostdata
->msgout
, 1, DMA_TO_DEVICE
);
853 script_patch_16(hostdata
->script
, MessageCount
, 1);
854 resume_offset
= hostdata
->pScript
+ Ent_SendMessageWithATN
;
859 printk(KERN_INFO
"scsi%d (%d:%d): Unexpected message %s: ",
860 host
->host_no
, pun
, lun
,
861 NCR_700_phase
[(dsps
& 0xf00) >> 8]);
862 scsi_print_msg(hostdata
->msgin
);
865 hostdata
->msgout
[0] = A_REJECT_MSG
;
866 dma_cache_sync(hostdata
->msgout
, 1, DMA_TO_DEVICE
);
867 script_patch_16(hostdata
->script
, MessageCount
, 1);
868 /* SendMsgOut returns, so set up the return
870 resume_offset
= hostdata
->pScript
+ Ent_SendMessageWithATN
;
872 NCR_700_writel(temp
, host
, TEMP_REG
);
873 return resume_offset
;
877 process_message(struct Scsi_Host
*host
, struct NCR_700_Host_Parameters
*hostdata
,
878 struct scsi_cmnd
*SCp
, __u32 dsp
, __u32 dsps
)
880 /* work out where to return to */
881 __u32 temp
= dsp
+ 8, resume_offset
= dsp
;
882 __u8 pun
= 0xff, lun
= 0xff;
885 pun
= SCp
->device
->id
;
886 lun
= SCp
->device
->lun
;
890 printk("scsi%d (%d:%d): message %s: ", host
->host_no
, pun
, lun
,
891 NCR_700_phase
[(dsps
& 0xf00) >> 8]);
892 scsi_print_msg(hostdata
->msgin
);
896 switch(hostdata
->msgin
[0]) {
899 resume_offset
= process_extended_message(host
, hostdata
, SCp
,
904 if(SCp
!= NULL
&& NCR_700_is_flag_set(SCp
->device
, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION
)) {
905 /* Rejected our sync negotiation attempt */
906 spi_period(SCp
->device
->sdev_target
) =
907 spi_offset(SCp
->device
->sdev_target
) = 0;
908 NCR_700_set_flag(SCp
->device
, NCR_700_DEV_NEGOTIATED_SYNC
);
909 NCR_700_clear_flag(SCp
->device
, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION
);
910 } else if(SCp
!= NULL
&& NCR_700_get_tag_neg_state(SCp
->device
) == NCR_700_DURING_TAG_NEGOTIATION
) {
911 /* rejected our first simple tag message */
912 printk(KERN_WARNING
"scsi%d (%d:%d) Rejected first tag queue attempt, turning off tag queueing\n", host
->host_no
, pun
, lun
);
913 /* we're done negotiating */
914 NCR_700_set_tag_neg_state(SCp
->device
, NCR_700_FINISHED_TAG_NEGOTIATION
);
915 hostdata
->tag_negotiated
&= ~(1<<SCp
->device
->id
);
916 SCp
->device
->tagged_supported
= 0;
917 scsi_deactivate_tcq(SCp
->device
, host
->cmd_per_lun
);
919 printk(KERN_WARNING
"scsi%d (%d:%d) Unexpected REJECT Message %s\n",
920 host
->host_no
, pun
, lun
,
921 NCR_700_phase
[(dsps
& 0xf00) >> 8]);
922 /* however, just ignore it */
926 case A_PARITY_ERROR_MSG
:
927 printk(KERN_ERR
"scsi%d (%d:%d) Parity Error!\n", host
->host_no
,
929 NCR_700_internal_bus_reset(host
);
931 case A_SIMPLE_TAG_MSG
:
932 printk(KERN_INFO
"scsi%d (%d:%d) SIMPLE TAG %d %s\n", host
->host_no
,
933 pun
, lun
, hostdata
->msgin
[1],
934 NCR_700_phase
[(dsps
& 0xf00) >> 8]);
938 printk(KERN_INFO
"scsi%d (%d:%d): Unexpected message %s: ",
939 host
->host_no
, pun
, lun
,
940 NCR_700_phase
[(dsps
& 0xf00) >> 8]);
942 scsi_print_msg(hostdata
->msgin
);
945 hostdata
->msgout
[0] = A_REJECT_MSG
;
946 dma_cache_sync(hostdata
->msgout
, 1, DMA_TO_DEVICE
);
947 script_patch_16(hostdata
->script
, MessageCount
, 1);
948 /* SendMsgOut returns, so set up the return
950 resume_offset
= hostdata
->pScript
+ Ent_SendMessageWithATN
;
954 NCR_700_writel(temp
, host
, TEMP_REG
);
955 /* set us up to receive another message */
956 dma_cache_sync(hostdata
->msgin
, MSG_ARRAY_SIZE
, DMA_FROM_DEVICE
);
957 return resume_offset
;
961 process_script_interrupt(__u32 dsps
, __u32 dsp
, struct scsi_cmnd
*SCp
,
962 struct Scsi_Host
*host
,
963 struct NCR_700_Host_Parameters
*hostdata
)
965 __u32 resume_offset
= 0;
966 __u8 pun
= 0xff, lun
=0xff;
969 pun
= SCp
->device
->id
;
970 lun
= SCp
->device
->lun
;
973 if(dsps
== A_GOOD_STATUS_AFTER_STATUS
) {
974 DEBUG((" COMMAND COMPLETE, status=%02x\n",
975 hostdata
->status
[0]));
976 /* OK, if TCQ still under negotiation, we now know it works */
977 if (NCR_700_get_tag_neg_state(SCp
->device
) == NCR_700_DURING_TAG_NEGOTIATION
)
978 NCR_700_set_tag_neg_state(SCp
->device
,
979 NCR_700_FINISHED_TAG_NEGOTIATION
);
981 /* check for contingent allegiance contitions */
982 if(status_byte(hostdata
->status
[0]) == CHECK_CONDITION
||
983 status_byte(hostdata
->status
[0]) == COMMAND_TERMINATED
) {
984 struct NCR_700_command_slot
*slot
=
985 (struct NCR_700_command_slot
*)SCp
->host_scribble
;
986 if(SCp
->cmnd
[0] == REQUEST_SENSE
) {
987 /* OOPS: bad device, returning another
988 * contingent allegiance condition */
989 printk(KERN_ERR
"scsi%d (%d:%d) broken device is looping in contingent allegiance: ignoring\n", host
->host_no
, pun
, lun
);
990 NCR_700_scsi_done(hostdata
, SCp
, hostdata
->status
[0]);
993 scsi_print_command(SCp
);
994 printk(" cmd %p has status %d, requesting sense\n",
995 SCp
, hostdata
->status
[0]);
997 /* we can destroy the command here
998 * because the contingent allegiance
999 * condition will cause a retry which
1000 * will re-copy the command from the
1001 * saved data_cmnd. We also unmap any
1002 * data associated with the command
1004 NCR_700_unmap(hostdata
, SCp
, slot
);
1006 SCp
->cmnd
[0] = REQUEST_SENSE
;
1007 SCp
->cmnd
[1] = (SCp
->device
->lun
& 0x7) << 5;
1010 SCp
->cmnd
[4] = sizeof(SCp
->sense_buffer
);
1013 /* Here's a quiet hack: the
1014 * REQUEST_SENSE command is six bytes,
1015 * so store a flag indicating that
1016 * this was an internal sense request
1017 * and the original status at the end
1019 SCp
->cmnd
[6] = NCR_700_INTERNAL_SENSE_MAGIC
;
1020 SCp
->cmnd
[7] = hostdata
->status
[0];
1022 SCp
->sc_data_direction
= DMA_FROM_DEVICE
;
1023 dma_sync_single_for_device(hostdata
->dev
, slot
->pCmd
,
1024 SCp
->cmd_len
, DMA_TO_DEVICE
);
1025 SCp
->request_bufflen
= sizeof(SCp
->sense_buffer
);
1026 slot
->dma_handle
= dma_map_single(hostdata
->dev
, SCp
->sense_buffer
, sizeof(SCp
->sense_buffer
), DMA_FROM_DEVICE
);
1027 slot
->SG
[0].ins
= bS_to_host(SCRIPT_MOVE_DATA_IN
| sizeof(SCp
->sense_buffer
));
1028 slot
->SG
[0].pAddr
= bS_to_host(slot
->dma_handle
);
1029 slot
->SG
[1].ins
= bS_to_host(SCRIPT_RETURN
);
1030 slot
->SG
[1].pAddr
= 0;
1031 slot
->resume_offset
= hostdata
->pScript
;
1032 dma_cache_sync(slot
->SG
, sizeof(slot
->SG
[0])*2, DMA_TO_DEVICE
);
1033 dma_cache_sync(SCp
->sense_buffer
, sizeof(SCp
->sense_buffer
), DMA_FROM_DEVICE
);
1035 /* queue the command for reissue */
1036 slot
->state
= NCR_700_SLOT_QUEUED
;
1037 hostdata
->state
= NCR_700_HOST_FREE
;
1038 hostdata
->cmd
= NULL
;
1041 // Currently rely on the mid layer evaluation
1042 // of the tag queuing capability
1044 //if(status_byte(hostdata->status[0]) == GOOD &&
1045 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1046 // /* Piggy back the tag queueing support
1047 // * on this command */
1048 // dma_sync_single_for_cpu(hostdata->dev,
1049 // slot->dma_handle,
1050 // SCp->request_bufflen,
1051 // DMA_FROM_DEVICE);
1052 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1053 // printk(KERN_INFO "scsi%d: (%d:%d) Enabling Tag Command Queuing\n", host->host_no, pun, lun);
1054 // hostdata->tag_negotiated |= (1<<SCp->device->id);
1055 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1057 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1058 // hostdata->tag_negotiated &= ~(1<<SCp->device->id);
1061 NCR_700_scsi_done(hostdata
, SCp
, hostdata
->status
[0]);
1063 } else if((dsps
& 0xfffff0f0) == A_UNEXPECTED_PHASE
) {
1064 __u8 i
= (dsps
& 0xf00) >> 8;
1066 printk(KERN_ERR
"scsi%d: (%d:%d), UNEXPECTED PHASE %s (%s)\n",
1067 host
->host_no
, pun
, lun
,
1069 sbcl_to_string(NCR_700_readb(host
, SBCL_REG
)));
1070 printk(KERN_ERR
" len = %d, cmd =", SCp
->cmd_len
);
1071 scsi_print_command(SCp
);
1073 NCR_700_internal_bus_reset(host
);
1074 } else if((dsps
& 0xfffff000) == A_FATAL
) {
1075 int i
= (dsps
& 0xfff);
1077 printk(KERN_ERR
"scsi%d: (%d:%d) FATAL ERROR: %s\n",
1078 host
->host_no
, pun
, lun
, NCR_700_fatal_messages
[i
]);
1079 if(dsps
== A_FATAL_ILLEGAL_MSG_LENGTH
) {
1080 printk(KERN_ERR
" msg begins %02x %02x\n",
1081 hostdata
->msgin
[0], hostdata
->msgin
[1]);
1083 NCR_700_internal_bus_reset(host
);
1084 } else if((dsps
& 0xfffff0f0) == A_DISCONNECT
) {
1085 #ifdef NCR_700_DEBUG
1086 __u8 i
= (dsps
& 0xf00) >> 8;
1088 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1089 host
->host_no
, pun
, lun
,
1090 i
, NCR_700_phase
[i
]);
1092 save_for_reselection(hostdata
, SCp
, dsp
);
1094 } else if(dsps
== A_RESELECTION_IDENTIFIED
) {
1096 struct NCR_700_command_slot
*slot
;
1097 __u8 reselection_id
= hostdata
->reselection_id
;
1098 struct scsi_device
*SDp
;
1100 lun
= hostdata
->msgin
[0] & 0x1f;
1102 hostdata
->reselection_id
= 0xff;
1103 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1104 host
->host_no
, reselection_id
, lun
));
1105 /* clear the reselection indicator */
1106 SDp
= __scsi_device_lookup(host
, 0, reselection_id
, lun
);
1107 if(unlikely(SDp
== NULL
)) {
1108 printk(KERN_ERR
"scsi%d: (%d:%d) HAS NO device\n",
1109 host
->host_no
, reselection_id
, lun
);
1112 if(hostdata
->msgin
[1] == A_SIMPLE_TAG_MSG
) {
1113 struct scsi_cmnd
*SCp
= scsi_find_tag(SDp
, hostdata
->msgin
[2]);
1114 if(unlikely(SCp
== NULL
)) {
1115 printk(KERN_ERR
"scsi%d: (%d:%d) no saved request for tag %d\n",
1116 host
->host_no
, reselection_id
, lun
, hostdata
->msgin
[2]);
1120 slot
= (struct NCR_700_command_slot
*)SCp
->host_scribble
;
1121 DEBUG(("53c700: %d:%d:%d, reselection is tag %d, slot %p(%d)\n",
1122 host
->host_no
, SDp
->id
, SDp
->lun
,
1123 hostdata
->msgin
[2], slot
, slot
->tag
));
1125 struct scsi_cmnd
*SCp
= scsi_find_tag(SDp
, SCSI_NO_TAG
);
1126 if(unlikely(SCp
== NULL
)) {
1127 printk(KERN_ERR
"scsi%d: (%d:%d) no saved request for untagged cmd\n",
1128 host
->host_no
, reselection_id
, lun
);
1131 slot
= (struct NCR_700_command_slot
*)SCp
->host_scribble
;
1135 printk(KERN_ERR
"scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1136 host
->host_no
, reselection_id
, lun
,
1137 hostdata
->msgin
[0], hostdata
->msgin
[1],
1138 hostdata
->msgin
[2]);
1140 if(hostdata
->state
!= NCR_700_HOST_BUSY
)
1141 printk(KERN_ERR
"scsi%d: FATAL, host not busy during valid reselection!\n",
1143 resume_offset
= slot
->resume_offset
;
1144 hostdata
->cmd
= slot
->cmnd
;
1146 /* re-patch for this command */
1147 script_patch_32_abs(hostdata
->script
, CommandAddress
,
1149 script_patch_16(hostdata
->script
,
1150 CommandCount
, slot
->cmnd
->cmd_len
);
1151 script_patch_32_abs(hostdata
->script
, SGScriptStartAddress
,
1152 to32bit(&slot
->pSG
[0].ins
));
1154 /* Note: setting SXFER only works if we're
1155 * still in the MESSAGE phase, so it is vital
1156 * that ACK is still asserted when we process
1157 * the reselection message. The resume offset
1158 * should therefore always clear ACK */
1159 NCR_700_writeb(NCR_700_get_SXFER(hostdata
->cmd
->device
),
1161 dma_cache_sync(hostdata
->msgin
,
1162 MSG_ARRAY_SIZE
, DMA_FROM_DEVICE
);
1163 dma_cache_sync(hostdata
->msgout
,
1164 MSG_ARRAY_SIZE
, DMA_TO_DEVICE
);
1165 /* I'm just being paranoid here, the command should
1166 * already have been flushed from the cache */
1167 dma_cache_sync(slot
->cmnd
->cmnd
,
1168 slot
->cmnd
->cmd_len
, DMA_TO_DEVICE
);
1173 } else if(dsps
== A_RESELECTED_DURING_SELECTION
) {
1175 /* This section is full of debugging code because I've
1176 * never managed to reach it. I think what happens is
1177 * that, because the 700 runs with selection
1178 * interrupts enabled the whole time that we take a
1179 * selection interrupt before we manage to get to the
1180 * reselected script interrupt */
1182 __u8 reselection_id
= NCR_700_readb(host
, SFBR_REG
);
1183 struct NCR_700_command_slot
*slot
;
1185 /* Take out our own ID */
1186 reselection_id
&= ~(1<<host
->this_id
);
1188 /* I've never seen this happen, so keep this as a printk rather
1190 printk(KERN_INFO
"scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1191 host
->host_no
, reselection_id
, lun
, dsp
, dsp
- hostdata
->pScript
, hostdata
->state
, hostdata
->command_slot_count
);
1194 /* FIXME: DEBUGGING CODE */
1195 __u32 SG
= (__u32
)bS_to_cpu(hostdata
->script
[A_SGScriptStartAddress_used
[0]]);
1198 for(i
=0; i
< NCR_700_COMMAND_SLOTS_PER_HOST
; i
++) {
1199 if(SG
>= to32bit(&hostdata
->slots
[i
].pSG
[0])
1200 && SG
<= to32bit(&hostdata
->slots
[i
].pSG
[NCR_700_SG_SEGMENTS
]))
1203 printk(KERN_INFO
"IDENTIFIED SG segment as being %08x in slot %p, cmd %p, slot->resume_offset=%08x\n", SG
, &hostdata
->slots
[i
], hostdata
->slots
[i
].cmnd
, hostdata
->slots
[i
].resume_offset
);
1204 SCp
= hostdata
->slots
[i
].cmnd
;
1208 slot
= (struct NCR_700_command_slot
*)SCp
->host_scribble
;
1209 /* change slot from busy to queued to redo command */
1210 slot
->state
= NCR_700_SLOT_QUEUED
;
1212 hostdata
->cmd
= NULL
;
1214 if(reselection_id
== 0) {
1215 if(hostdata
->reselection_id
== 0xff) {
1216 printk(KERN_ERR
"scsi%d: Invalid reselection during selection!!\n", host
->host_no
);
1219 printk(KERN_ERR
"scsi%d: script reselected and we took a selection interrupt\n",
1221 reselection_id
= hostdata
->reselection_id
;
1225 /* convert to real ID */
1226 reselection_id
= bitmap_to_number(reselection_id
);
1228 hostdata
->reselection_id
= reselection_id
;
1229 /* just in case we have a stale simple tag message, clear it */
1230 hostdata
->msgin
[1] = 0;
1231 dma_cache_sync(hostdata
->msgin
,
1232 MSG_ARRAY_SIZE
, DMA_BIDIRECTIONAL
);
1233 if(hostdata
->tag_negotiated
& (1<<reselection_id
)) {
1234 resume_offset
= hostdata
->pScript
+ Ent_GetReselectionWithTag
;
1236 resume_offset
= hostdata
->pScript
+ Ent_GetReselectionData
;
1238 } else if(dsps
== A_COMPLETED_SELECTION_AS_TARGET
) {
1239 /* we've just disconnected from the bus, do nothing since
1240 * a return here will re-run the queued command slot
1241 * that may have been interrupted by the initial selection */
1242 DEBUG((" SELECTION COMPLETED\n"));
1243 } else if((dsps
& 0xfffff0f0) == A_MSG_IN
) {
1244 resume_offset
= process_message(host
, hostdata
, SCp
,
1246 } else if((dsps
& 0xfffff000) == 0) {
1247 __u8 i
= (dsps
& 0xf0) >> 4, j
= (dsps
& 0xf00) >> 8;
1248 printk(KERN_ERR
"scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1249 host
->host_no
, pun
, lun
, NCR_700_condition
[i
],
1250 NCR_700_phase
[j
], dsp
- hostdata
->pScript
);
1252 scsi_print_command(SCp
);
1255 for(i
= 0; i
< SCp
->use_sg
+ 1; i
++) {
1256 printk(KERN_INFO
" SG[%d].length = %d, move_insn=%08x, addr %08x\n", i
, ((struct scatterlist
*)SCp
->buffer
)[i
].length
, ((struct NCR_700_command_slot
*)SCp
->host_scribble
)->SG
[i
].ins
, ((struct NCR_700_command_slot
*)SCp
->host_scribble
)->SG
[i
].pAddr
);
1260 NCR_700_internal_bus_reset(host
);
1261 } else if((dsps
& 0xfffff000) == A_DEBUG_INTERRUPT
) {
1262 printk(KERN_NOTICE
"scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1263 host
->host_no
, pun
, lun
, dsps
& 0xfff, dsp
, dsp
- hostdata
->pScript
);
1264 resume_offset
= dsp
;
1266 printk(KERN_ERR
"scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1267 host
->host_no
, pun
, lun
, dsps
, dsp
- hostdata
->pScript
);
1268 NCR_700_internal_bus_reset(host
);
1270 return resume_offset
;
1273 /* We run the 53c700 with selection interrupts always enabled. This
1274 * means that the chip may be selected as soon as the bus frees. On a
1275 * busy bus, this can be before the scripts engine finishes its
1276 * processing. Therefore, part of the selection processing has to be
1277 * to find out what the scripts engine is doing and complete the
1278 * function if necessary (i.e. process the pending disconnect or save
1279 * the interrupted initial selection */
1281 process_selection(struct Scsi_Host
*host
, __u32 dsp
)
1283 __u8 id
= 0; /* Squash compiler warning */
1285 __u32 resume_offset
= 0;
1286 struct NCR_700_Host_Parameters
*hostdata
=
1287 (struct NCR_700_Host_Parameters
*)host
->hostdata
[0];
1288 struct scsi_cmnd
*SCp
= hostdata
->cmd
;
1291 for(count
= 0; count
< 5; count
++) {
1292 id
= NCR_700_readb(host
, hostdata
->chip710
?
1293 CTEST9_REG
: SFBR_REG
);
1295 /* Take out our own ID */
1296 id
&= ~(1<<host
->this_id
);
1301 sbcl
= NCR_700_readb(host
, SBCL_REG
);
1302 if((sbcl
& SBCL_IO
) == 0) {
1303 /* mark as having been selected rather than reselected */
1306 /* convert to real ID */
1307 hostdata
->reselection_id
= id
= bitmap_to_number(id
);
1308 DEBUG(("scsi%d: Reselected by %d\n",
1309 host
->host_no
, id
));
1311 if(hostdata
->state
== NCR_700_HOST_BUSY
&& SCp
!= NULL
) {
1312 struct NCR_700_command_slot
*slot
=
1313 (struct NCR_700_command_slot
*)SCp
->host_scribble
;
1314 DEBUG((" ID %d WARNING: RESELECTION OF BUSY HOST, saving cmd %p, slot %p, addr %x [%04x], resume %x!\n", id
, hostdata
->cmd
, slot
, dsp
, dsp
- hostdata
->pScript
, resume_offset
));
1316 switch(dsp
- hostdata
->pScript
) {
1317 case Ent_Disconnect1
:
1318 case Ent_Disconnect2
:
1319 save_for_reselection(hostdata
, SCp
, Ent_Disconnect2
+ hostdata
->pScript
);
1321 case Ent_Disconnect3
:
1322 case Ent_Disconnect4
:
1323 save_for_reselection(hostdata
, SCp
, Ent_Disconnect4
+ hostdata
->pScript
);
1325 case Ent_Disconnect5
:
1326 case Ent_Disconnect6
:
1327 save_for_reselection(hostdata
, SCp
, Ent_Disconnect6
+ hostdata
->pScript
);
1329 case Ent_Disconnect7
:
1330 case Ent_Disconnect8
:
1331 save_for_reselection(hostdata
, SCp
, Ent_Disconnect8
+ hostdata
->pScript
);
1335 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS
, dsp
, SCp
, host
, hostdata
);
1339 slot
->state
= NCR_700_SLOT_QUEUED
;
1343 hostdata
->state
= NCR_700_HOST_BUSY
;
1344 hostdata
->cmd
= NULL
;
1345 /* clear any stale simple tag message */
1346 hostdata
->msgin
[1] = 0;
1347 dma_cache_sync(hostdata
->msgin
, MSG_ARRAY_SIZE
,
1351 /* Selected as target, Ignore */
1352 resume_offset
= hostdata
->pScript
+ Ent_SelectedAsTarget
;
1353 } else if(hostdata
->tag_negotiated
& (1<<id
)) {
1354 resume_offset
= hostdata
->pScript
+ Ent_GetReselectionWithTag
;
1356 resume_offset
= hostdata
->pScript
+ Ent_GetReselectionData
;
1358 return resume_offset
;
1362 NCR_700_clear_fifo(struct Scsi_Host
*host
) {
1363 const struct NCR_700_Host_Parameters
*hostdata
1364 = (struct NCR_700_Host_Parameters
*)host
->hostdata
[0];
1365 if(hostdata
->chip710
) {
1366 NCR_700_writeb(CLR_FIFO_710
, host
, CTEST8_REG
);
1368 NCR_700_writeb(CLR_FIFO
, host
, DFIFO_REG
);
1373 NCR_700_flush_fifo(struct Scsi_Host
*host
) {
1374 const struct NCR_700_Host_Parameters
*hostdata
1375 = (struct NCR_700_Host_Parameters
*)host
->hostdata
[0];
1376 if(hostdata
->chip710
) {
1377 NCR_700_writeb(FLUSH_DMA_FIFO_710
, host
, CTEST8_REG
);
1379 NCR_700_writeb(0, host
, CTEST8_REG
);
1381 NCR_700_writeb(FLUSH_DMA_FIFO
, host
, DFIFO_REG
);
1383 NCR_700_writeb(0, host
, DFIFO_REG
);
1388 /* The queue lock with interrupts disabled must be held on entry to
1391 NCR_700_start_command(struct scsi_cmnd
*SCp
)
1393 struct NCR_700_command_slot
*slot
=
1394 (struct NCR_700_command_slot
*)SCp
->host_scribble
;
1395 struct NCR_700_Host_Parameters
*hostdata
=
1396 (struct NCR_700_Host_Parameters
*)SCp
->device
->host
->hostdata
[0];
1397 __u16 count
= 1; /* for IDENTIFY message */
1399 if(hostdata
->state
!= NCR_700_HOST_FREE
) {
1400 /* keep this inside the lock to close the race window where
1401 * the running command finishes on another CPU while we don't
1402 * change the state to queued on this one */
1403 slot
->state
= NCR_700_SLOT_QUEUED
;
1405 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1406 SCp
->device
->host
->host_no
, slot
->cmnd
, slot
));
1409 hostdata
->state
= NCR_700_HOST_BUSY
;
1410 hostdata
->cmd
= SCp
;
1411 slot
->state
= NCR_700_SLOT_BUSY
;
1412 /* keep interrupts disabled until we have the command correctly
1413 * set up so we cannot take a selection interrupt */
1415 hostdata
->msgout
[0] = NCR_700_identify(SCp
->cmnd
[0] != REQUEST_SENSE
,
1417 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1418 * if the negotiated transfer parameters still hold, so
1419 * always renegotiate them */
1420 if(SCp
->cmnd
[0] == INQUIRY
|| SCp
->cmnd
[0] == REQUEST_SENSE
) {
1421 NCR_700_clear_flag(SCp
->device
, NCR_700_DEV_NEGOTIATED_SYNC
);
1424 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1425 * If a contingent allegiance condition exists, the device
1426 * will refuse all tags, so send the request sense as untagged
1428 if((hostdata
->tag_negotiated
& (1<<SCp
->device
->id
))
1429 && (slot
->tag
!= SCSI_NO_TAG
&& SCp
->cmnd
[0] != REQUEST_SENSE
)) {
1430 count
+= scsi_populate_tag_msg(SCp
, &hostdata
->msgout
[count
]);
1433 if(hostdata
->fast
&&
1434 NCR_700_is_flag_clear(SCp
->device
, NCR_700_DEV_NEGOTIATED_SYNC
)) {
1435 memcpy(&hostdata
->msgout
[count
], NCR_700_SDTR_msg
,
1436 sizeof(NCR_700_SDTR_msg
));
1437 hostdata
->msgout
[count
+3] = spi_period(SCp
->device
->sdev_target
);
1438 hostdata
->msgout
[count
+4] = spi_offset(SCp
->device
->sdev_target
);
1439 count
+= sizeof(NCR_700_SDTR_msg
);
1440 NCR_700_set_flag(SCp
->device
, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION
);
1443 script_patch_16(hostdata
->script
, MessageCount
, count
);
1446 script_patch_ID(hostdata
->script
,
1447 Device_ID
, 1<<SCp
->device
->id
);
1449 script_patch_32_abs(hostdata
->script
, CommandAddress
,
1451 script_patch_16(hostdata
->script
, CommandCount
, SCp
->cmd_len
);
1452 /* finally plumb the beginning of the SG list into the script
1454 script_patch_32_abs(hostdata
->script
, SGScriptStartAddress
,
1455 to32bit(&slot
->pSG
[0].ins
));
1456 NCR_700_clear_fifo(SCp
->device
->host
);
1458 if(slot
->resume_offset
== 0)
1459 slot
->resume_offset
= hostdata
->pScript
;
1460 /* now perform all the writebacks and invalidates */
1461 dma_cache_sync(hostdata
->msgout
, count
, DMA_TO_DEVICE
);
1462 dma_cache_sync(hostdata
->msgin
, MSG_ARRAY_SIZE
,
1464 dma_cache_sync(SCp
->cmnd
, SCp
->cmd_len
, DMA_TO_DEVICE
);
1465 dma_cache_sync(hostdata
->status
, 1, DMA_FROM_DEVICE
);
1467 /* set the synchronous period/offset */
1468 NCR_700_writeb(NCR_700_get_SXFER(SCp
->device
),
1469 SCp
->device
->host
, SXFER_REG
);
1470 NCR_700_writel(slot
->temp
, SCp
->device
->host
, TEMP_REG
);
1471 NCR_700_writel(slot
->resume_offset
, SCp
->device
->host
, DSP_REG
);
1477 NCR_700_intr(int irq
, void *dev_id
, struct pt_regs
*regs
)
1479 struct Scsi_Host
*host
= (struct Scsi_Host
*)dev_id
;
1480 struct NCR_700_Host_Parameters
*hostdata
=
1481 (struct NCR_700_Host_Parameters
*)host
->hostdata
[0];
1483 __u32 resume_offset
= 0;
1484 __u8 pun
= 0xff, lun
= 0xff;
1485 unsigned long flags
;
1488 /* Use the host lock to serialise acess to the 53c700
1489 * hardware. Note: In future, we may need to take the queue
1490 * lock to enter the done routines. When that happens, we
1491 * need to ensure that for this driver, the host lock and the
1492 * queue lock point to the same thing. */
1493 spin_lock_irqsave(host
->host_lock
, flags
);
1494 if((istat
= NCR_700_readb(host
, ISTAT_REG
))
1495 & (SCSI_INT_PENDING
| DMA_INT_PENDING
)) {
1497 __u8 sstat0
= 0, dstat
= 0;
1499 struct scsi_cmnd
*SCp
= hostdata
->cmd
;
1500 enum NCR_700_Host_State state
;
1503 state
= hostdata
->state
;
1504 SCp
= hostdata
->cmd
;
1506 if(istat
& SCSI_INT_PENDING
) {
1509 sstat0
= NCR_700_readb(host
, SSTAT0_REG
);
1512 if(istat
& DMA_INT_PENDING
) {
1515 dstat
= NCR_700_readb(host
, DSTAT_REG
);
1518 dsps
= NCR_700_readl(host
, DSPS_REG
);
1519 dsp
= NCR_700_readl(host
, DSP_REG
);
1521 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1522 host
->host_no
, istat
, sstat0
, dstat
,
1523 (dsp
- (__u32
)(hostdata
->pScript
))/4,
1527 pun
= SCp
->device
->id
;
1528 lun
= SCp
->device
->lun
;
1531 if(sstat0
& SCSI_RESET_DETECTED
) {
1532 struct scsi_device
*SDp
;
1535 hostdata
->state
= NCR_700_HOST_BUSY
;
1537 printk(KERN_ERR
"scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1538 host
->host_no
, SCp
, SCp
== NULL
? NULL
: SCp
->host_scribble
, dsp
, dsp
- hostdata
->pScript
);
1540 scsi_report_bus_reset(host
, 0);
1542 /* clear all the negotiated parameters */
1543 __shost_for_each_device(SDp
, host
)
1544 SDp
->hostdata
= NULL
;
1546 /* clear all the slots and their pending commands */
1547 for(i
= 0; i
< NCR_700_COMMAND_SLOTS_PER_HOST
; i
++) {
1548 struct scsi_cmnd
*SCp
;
1549 struct NCR_700_command_slot
*slot
=
1550 &hostdata
->slots
[i
];
1552 if(slot
->state
== NCR_700_SLOT_FREE
)
1556 printk(KERN_ERR
" failing command because of reset, slot %p, cmnd %p\n",
1558 free_slot(slot
, hostdata
);
1559 SCp
->host_scribble
= NULL
;
1560 NCR_700_set_depth(SCp
->device
, 0);
1561 /* NOTE: deadlock potential here: we
1562 * rely on mid-layer guarantees that
1563 * scsi_done won't try to issue the
1564 * command again otherwise we'll
1566 * hostdata->state_lock */
1567 SCp
->result
= DID_RESET
<< 16;
1568 SCp
->scsi_done(SCp
);
1571 NCR_700_chip_setup(host
);
1573 hostdata
->state
= NCR_700_HOST_FREE
;
1574 hostdata
->cmd
= NULL
;
1575 /* signal back if this was an eh induced reset */
1576 if(hostdata
->eh_complete
!= NULL
)
1577 complete(hostdata
->eh_complete
);
1579 } else if(sstat0
& SELECTION_TIMEOUT
) {
1580 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1581 host
->host_no
, pun
, lun
));
1582 NCR_700_scsi_done(hostdata
, SCp
, DID_NO_CONNECT
<<16);
1583 } else if(sstat0
& PHASE_MISMATCH
) {
1584 struct NCR_700_command_slot
*slot
= (SCp
== NULL
) ? NULL
:
1585 (struct NCR_700_command_slot
*)SCp
->host_scribble
;
1587 if(dsp
== Ent_SendMessage
+ 8 + hostdata
->pScript
) {
1588 /* It wants to reply to some part of
1590 #ifdef NCR_700_DEBUG
1591 __u32 temp
= NCR_700_readl(host
, TEMP_REG
);
1592 int count
= (hostdata
->script
[Ent_SendMessage
/4] & 0xffffff) - ((NCR_700_readl(host
, DBC_REG
) & 0xffffff) + NCR_700_data_residual(host
));
1593 printk("scsi%d (%d:%d) PHASE MISMATCH IN SEND MESSAGE %d remain, return %p[%04x], phase %s\n", host
->host_no
, pun
, lun
, count
, (void *)temp
, temp
- hostdata
->pScript
, sbcl_to_string(NCR_700_readb(host
, SBCL_REG
)));
1595 resume_offset
= hostdata
->pScript
+ Ent_SendMessagePhaseMismatch
;
1596 } else if(dsp
>= to32bit(&slot
->pSG
[0].ins
) &&
1597 dsp
<= to32bit(&slot
->pSG
[NCR_700_SG_SEGMENTS
].ins
)) {
1598 int data_transfer
= NCR_700_readl(host
, DBC_REG
) & 0xffffff;
1599 int SGcount
= (dsp
- to32bit(&slot
->pSG
[0].ins
))/sizeof(struct NCR_700_SG_List
);
1600 int residual
= NCR_700_data_residual(host
);
1602 #ifdef NCR_700_DEBUG
1603 __u32 naddr
= NCR_700_readl(host
, DNAD_REG
);
1605 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1606 host
->host_no
, pun
, lun
,
1607 SGcount
, data_transfer
);
1608 scsi_print_command(SCp
);
1610 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1611 host
->host_no
, pun
, lun
,
1612 SGcount
, data_transfer
, residual
);
1615 data_transfer
+= residual
;
1617 if(data_transfer
!= 0) {
1623 count
= (bS_to_cpu(slot
->SG
[SGcount
].ins
) & 0x00ffffff);
1624 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count
, count
-data_transfer
));
1625 slot
->SG
[SGcount
].ins
&= bS_to_host(0xff000000);
1626 slot
->SG
[SGcount
].ins
|= bS_to_host(data_transfer
);
1627 pAddr
= bS_to_cpu(slot
->SG
[SGcount
].pAddr
);
1628 pAddr
+= (count
- data_transfer
);
1629 #ifdef NCR_700_DEBUG
1630 if(pAddr
!= naddr
) {
1631 printk("scsi%d (%d:%d) transfer mismatch pAddr=%lx, naddr=%lx, data_transfer=%d, residual=%d\n", host
->host_no
, pun
, lun
, (unsigned long)pAddr
, (unsigned long)naddr
, data_transfer
, residual
);
1634 slot
->SG
[SGcount
].pAddr
= bS_to_host(pAddr
);
1636 /* set the executed moves to nops */
1637 for(i
=0; i
<SGcount
; i
++) {
1638 slot
->SG
[i
].ins
= bS_to_host(SCRIPT_NOP
);
1639 slot
->SG
[i
].pAddr
= 0;
1641 dma_cache_sync(slot
->SG
, sizeof(slot
->SG
), DMA_TO_DEVICE
);
1642 /* and pretend we disconnected after
1643 * the command phase */
1644 resume_offset
= hostdata
->pScript
+ Ent_MsgInDuringData
;
1645 /* make sure all the data is flushed */
1646 NCR_700_flush_fifo(host
);
1648 __u8 sbcl
= NCR_700_readb(host
, SBCL_REG
);
1649 printk(KERN_ERR
"scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1650 host
->host_no
, pun
, lun
, dsp
- hostdata
->pScript
, sbcl_to_string(sbcl
));
1651 NCR_700_internal_bus_reset(host
);
1654 } else if(sstat0
& SCSI_GROSS_ERROR
) {
1655 printk(KERN_ERR
"scsi%d: (%d:%d) GROSS ERROR\n",
1656 host
->host_no
, pun
, lun
);
1657 NCR_700_scsi_done(hostdata
, SCp
, DID_ERROR
<<16);
1658 } else if(sstat0
& PARITY_ERROR
) {
1659 printk(KERN_ERR
"scsi%d: (%d:%d) PARITY ERROR\n",
1660 host
->host_no
, pun
, lun
);
1661 NCR_700_scsi_done(hostdata
, SCp
, DID_ERROR
<<16);
1662 } else if(dstat
& SCRIPT_INT_RECEIVED
) {
1663 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1664 host
->host_no
, pun
, lun
));
1665 resume_offset
= process_script_interrupt(dsps
, dsp
, SCp
, host
, hostdata
);
1666 } else if(dstat
& (ILGL_INST_DETECTED
)) {
1667 printk(KERN_ERR
"scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1668 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1669 host
->host_no
, pun
, lun
,
1670 dsp
, dsp
- hostdata
->pScript
);
1671 NCR_700_scsi_done(hostdata
, SCp
, DID_ERROR
<<16);
1672 } else if(dstat
& (WATCH_DOG_INTERRUPT
|ABORTED
)) {
1673 printk(KERN_ERR
"scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1674 host
->host_no
, pun
, lun
, dstat
);
1675 NCR_700_scsi_done(hostdata
, SCp
, DID_ERROR
<<16);
1679 /* NOTE: selection interrupt processing MUST occur
1680 * after script interrupt processing to correctly cope
1681 * with the case where we process a disconnect and
1682 * then get reselected before we process the
1684 if(sstat0
& SELECTED
) {
1685 /* FIXME: It currently takes at least FOUR
1686 * interrupts to complete a command that
1687 * disconnects: one for the disconnect, one
1688 * for the reselection, one to get the
1689 * reselection data and one to complete the
1690 * command. If we guess the reselected
1691 * command here and prepare it, we only need
1692 * to get a reselection data interrupt if we
1693 * guessed wrongly. Since the interrupt
1694 * overhead is much greater than the command
1695 * setup, this would be an efficient
1696 * optimisation particularly as we probably
1697 * only have one outstanding command on a
1698 * target most of the time */
1700 resume_offset
= process_selection(host
, dsp
);
1707 if(hostdata
->state
!= NCR_700_HOST_BUSY
) {
1708 printk(KERN_ERR
"scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1709 host
->host_no
, resume_offset
, resume_offset
- hostdata
->pScript
);
1710 hostdata
->state
= NCR_700_HOST_BUSY
;
1713 DEBUG(("Attempting to resume at %x\n", resume_offset
));
1714 NCR_700_clear_fifo(host
);
1715 NCR_700_writel(resume_offset
, host
, DSP_REG
);
1717 /* There is probably a technical no-no about this: If we're a
1718 * shared interrupt and we got this interrupt because the
1719 * other device needs servicing not us, we're still going to
1720 * check our queued commands here---of course, there shouldn't
1721 * be any outstanding.... */
1722 if(hostdata
->state
== NCR_700_HOST_FREE
) {
1725 for(i
= 0; i
< NCR_700_COMMAND_SLOTS_PER_HOST
; i
++) {
1726 /* fairness: always run the queue from the last
1727 * position we left off */
1728 int j
= (i
+ hostdata
->saved_slot_position
)
1729 % NCR_700_COMMAND_SLOTS_PER_HOST
;
1731 if(hostdata
->slots
[j
].state
!= NCR_700_SLOT_QUEUED
)
1733 if(NCR_700_start_command(hostdata
->slots
[j
].cmnd
)) {
1734 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1735 host
->host_no
, &hostdata
->slots
[j
],
1736 hostdata
->slots
[j
].cmnd
));
1737 hostdata
->saved_slot_position
= j
+ 1;
1744 spin_unlock_irqrestore(host
->host_lock
, flags
);
1745 return IRQ_RETVAL(handled
);
1749 NCR_700_queuecommand(struct scsi_cmnd
*SCp
, void (*done
)(struct scsi_cmnd
*))
1751 struct NCR_700_Host_Parameters
*hostdata
=
1752 (struct NCR_700_Host_Parameters
*)SCp
->device
->host
->hostdata
[0];
1754 enum dma_data_direction direction
;
1755 struct NCR_700_command_slot
*slot
;
1757 if(hostdata
->command_slot_count
>= NCR_700_COMMAND_SLOTS_PER_HOST
) {
1758 /* We're over our allocation, this should never happen
1759 * since we report the max allocation to the mid layer */
1760 printk(KERN_WARNING
"scsi%d: Command depth has gone over queue depth\n", SCp
->device
->host
->host_no
);
1763 /* check for untagged commands. We cannot have any outstanding
1764 * commands if we accept them. Commands could be untagged because:
1766 * - The tag negotiated bitmap is clear
1767 * - The blk layer sent and untagged command
1769 if(NCR_700_get_depth(SCp
->device
) != 0
1770 && (!(hostdata
->tag_negotiated
& (1<<SCp
->device
->id
))
1771 || !blk_rq_tagged(SCp
->request
))) {
1772 DEBUG((KERN_ERR
"scsi%d (%d:%d) has non zero depth %d\n",
1773 SCp
->device
->host
->host_no
, SCp
->device
->id
, SCp
->device
->lun
,
1774 NCR_700_get_depth(SCp
->device
)));
1775 return SCSI_MLQUEUE_DEVICE_BUSY
;
1777 if(NCR_700_get_depth(SCp
->device
) >= SCp
->device
->queue_depth
) {
1778 DEBUG((KERN_ERR
"scsi%d (%d:%d) has max tag depth %d\n",
1779 SCp
->device
->host
->host_no
, SCp
->device
->id
, SCp
->device
->lun
,
1780 NCR_700_get_depth(SCp
->device
)));
1781 return SCSI_MLQUEUE_DEVICE_BUSY
;
1783 NCR_700_set_depth(SCp
->device
, NCR_700_get_depth(SCp
->device
) + 1);
1785 /* begin the command here */
1786 /* no need to check for NULL, test for command_slot_count above
1787 * ensures a slot is free */
1788 slot
= find_empty_slot(hostdata
);
1792 SCp
->scsi_done
= done
;
1793 SCp
->host_scribble
= (unsigned char *)slot
;
1794 SCp
->SCp
.ptr
= NULL
;
1795 SCp
->SCp
.buffer
= NULL
;
1797 #ifdef NCR_700_DEBUG
1798 printk("53c700: scsi%d, command ", SCp
->device
->host
->host_no
);
1799 scsi_print_command(SCp
);
1801 if(blk_rq_tagged(SCp
->request
)
1802 && (hostdata
->tag_negotiated
&(1<<SCp
->device
->id
)) == 0
1803 && NCR_700_get_tag_neg_state(SCp
->device
) == NCR_700_START_TAG_NEGOTIATION
) {
1804 printk(KERN_ERR
"scsi%d: (%d:%d) Enabling Tag Command Queuing\n", SCp
->device
->host
->host_no
, SCp
->device
->id
, SCp
->device
->lun
);
1805 hostdata
->tag_negotiated
|= (1<<SCp
->device
->id
);
1806 NCR_700_set_tag_neg_state(SCp
->device
, NCR_700_DURING_TAG_NEGOTIATION
);
1809 /* here we may have to process an untagged command. The gate
1810 * above ensures that this will be the only one outstanding,
1811 * so clear the tag negotiated bit.
1813 * FIXME: This will royally screw up on multiple LUN devices
1815 if(!blk_rq_tagged(SCp
->request
)
1816 && (hostdata
->tag_negotiated
&(1<<SCp
->device
->id
))) {
1817 printk(KERN_INFO
"scsi%d: (%d:%d) Disabling Tag Command Queuing\n", SCp
->device
->host
->host_no
, SCp
->device
->id
, SCp
->device
->lun
);
1818 hostdata
->tag_negotiated
&= ~(1<<SCp
->device
->id
);
1821 if((hostdata
->tag_negotiated
&(1<<SCp
->device
->id
))
1822 && scsi_get_tag_type(SCp
->device
)) {
1823 slot
->tag
= SCp
->request
->tag
;
1824 DEBUG(("53c700 %d:%d:%d, sending out tag %d, slot %p\n",
1825 SCp
->device
->host
->host_no
, SCp
->device
->id
, SCp
->device
->lun
, slot
->tag
,
1828 slot
->tag
= SCSI_NO_TAG
;
1829 /* must populate current_cmnd for scsi_find_tag to work */
1830 SCp
->device
->current_cmnd
= SCp
;
1832 /* sanity check: some of the commands generated by the mid-layer
1833 * have an eccentric idea of their sc_data_direction */
1834 if(!SCp
->use_sg
&& !SCp
->request_bufflen
1835 && SCp
->sc_data_direction
!= DMA_NONE
) {
1836 #ifdef NCR_700_DEBUG
1837 printk("53c700: Command");
1838 scsi_print_command(SCp
);
1839 printk("Has wrong data direction %d\n", SCp
->sc_data_direction
);
1841 SCp
->sc_data_direction
= DMA_NONE
;
1844 switch (SCp
->cmnd
[0]) {
1846 /* clear the internal sense magic */
1850 /* OK, get it from the command */
1851 switch(SCp
->sc_data_direction
) {
1852 case DMA_BIDIRECTIONAL
:
1854 printk(KERN_ERR
"53c700: Unknown command for data direction ");
1855 scsi_print_command(SCp
);
1862 case DMA_FROM_DEVICE
:
1863 move_ins
= SCRIPT_MOVE_DATA_IN
;
1866 move_ins
= SCRIPT_MOVE_DATA_OUT
;
1871 /* now build the scatter gather list */
1872 direction
= SCp
->sc_data_direction
;
1876 dma_addr_t vPtr
= 0;
1880 sg_count
= dma_map_sg(hostdata
->dev
, SCp
->buffer
,
1881 SCp
->use_sg
, direction
);
1883 vPtr
= dma_map_single(hostdata
->dev
,
1884 SCp
->request_buffer
,
1885 SCp
->request_bufflen
,
1887 count
= SCp
->request_bufflen
;
1888 slot
->dma_handle
= vPtr
;
1893 for(i
= 0; i
< sg_count
; i
++) {
1896 struct scatterlist
*sg
= SCp
->buffer
;
1898 vPtr
= sg_dma_address(&sg
[i
]);
1899 count
= sg_dma_len(&sg
[i
]);
1902 slot
->SG
[i
].ins
= bS_to_host(move_ins
| count
);
1903 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1904 i
, count
, slot
->SG
[i
].ins
, (unsigned long)vPtr
));
1905 slot
->SG
[i
].pAddr
= bS_to_host(vPtr
);
1907 slot
->SG
[i
].ins
= bS_to_host(SCRIPT_RETURN
);
1908 slot
->SG
[i
].pAddr
= 0;
1909 dma_cache_sync(slot
->SG
, sizeof(slot
->SG
), DMA_TO_DEVICE
);
1910 DEBUG((" SETTING %08lx to %x\n",
1911 (&slot
->pSG
[i
].ins
),
1914 slot
->resume_offset
= 0;
1915 slot
->pCmd
= dma_map_single(hostdata
->dev
, SCp
->cmnd
,
1916 sizeof(SCp
->cmnd
), DMA_TO_DEVICE
);
1917 NCR_700_start_command(SCp
);
1922 NCR_700_abort(struct scsi_cmnd
* SCp
)
1924 struct NCR_700_command_slot
*slot
;
1926 printk(KERN_INFO
"scsi%d (%d:%d) New error handler wants to abort command\n\t",
1927 SCp
->device
->host
->host_no
, SCp
->device
->id
, SCp
->device
->lun
);
1928 scsi_print_command(SCp
);
1930 slot
= (struct NCR_700_command_slot
*)SCp
->host_scribble
;
1933 /* no outstanding command to abort */
1935 if(SCp
->cmnd
[0] == TEST_UNIT_READY
) {
1936 /* FIXME: This is because of a problem in the new
1937 * error handler. When it is in error recovery, it
1938 * will send a TUR to a device it thinks may still be
1939 * showing a problem. If the TUR isn't responded to,
1940 * it will abort it and mark the device off line.
1941 * Unfortunately, it does no other error recovery, so
1942 * this would leave us with an outstanding command
1943 * occupying a slot. Rather than allow this to
1944 * happen, we issue a bus reset to force all
1945 * outstanding commands to terminate here. */
1946 NCR_700_internal_bus_reset(SCp
->device
->host
);
1947 /* still drop through and return failed */
1954 NCR_700_bus_reset(struct scsi_cmnd
* SCp
)
1956 DECLARE_COMPLETION(complete
);
1957 struct NCR_700_Host_Parameters
*hostdata
=
1958 (struct NCR_700_Host_Parameters
*)SCp
->device
->host
->hostdata
[0];
1960 printk(KERN_INFO
"scsi%d (%d:%d) New error handler wants BUS reset, cmd %p\n\t",
1961 SCp
->device
->host
->host_no
, SCp
->device
->id
, SCp
->device
->lun
, SCp
);
1962 scsi_print_command(SCp
);
1963 /* In theory, eh_complete should always be null because the
1964 * eh is single threaded, but just in case we're handling a
1965 * reset via sg or something */
1966 while(hostdata
->eh_complete
!= NULL
) {
1967 spin_unlock_irq(SCp
->device
->host
->host_lock
);
1968 msleep_interruptible(100);
1969 spin_lock_irq(SCp
->device
->host
->host_lock
);
1971 hostdata
->eh_complete
= &complete
;
1972 NCR_700_internal_bus_reset(SCp
->device
->host
);
1973 spin_unlock_irq(SCp
->device
->host
->host_lock
);
1974 wait_for_completion(&complete
);
1975 spin_lock_irq(SCp
->device
->host
->host_lock
);
1976 hostdata
->eh_complete
= NULL
;
1977 /* Revalidate the transport parameters of the failing device */
1979 spi_schedule_dv_device(SCp
->device
);
1984 NCR_700_dev_reset(struct scsi_cmnd
* SCp
)
1986 printk(KERN_INFO
"scsi%d (%d:%d) New error handler wants device reset\n\t",
1987 SCp
->device
->host
->host_no
, SCp
->device
->id
, SCp
->device
->lun
);
1988 scsi_print_command(SCp
);
1994 NCR_700_host_reset(struct scsi_cmnd
* SCp
)
1996 printk(KERN_INFO
"scsi%d (%d:%d) New error handler wants HOST reset\n\t",
1997 SCp
->device
->host
->host_no
, SCp
->device
->id
, SCp
->device
->lun
);
1998 scsi_print_command(SCp
);
2000 NCR_700_internal_bus_reset(SCp
->device
->host
);
2001 NCR_700_chip_reset(SCp
->device
->host
);
2006 NCR_700_set_period(struct scsi_target
*STp
, int period
)
2008 struct Scsi_Host
*SHp
= dev_to_shost(STp
->dev
.parent
);
2009 struct NCR_700_Host_Parameters
*hostdata
=
2010 (struct NCR_700_Host_Parameters
*)SHp
->hostdata
[0];
2015 if(period
< hostdata
->min_period
)
2016 period
= hostdata
->min_period
;
2018 spi_period(STp
) = period
;
2019 spi_flags(STp
) &= ~(NCR_700_DEV_NEGOTIATED_SYNC
|
2020 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION
);
2021 spi_flags(STp
) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION
;
2025 NCR_700_set_offset(struct scsi_target
*STp
, int offset
)
2027 struct Scsi_Host
*SHp
= dev_to_shost(STp
->dev
.parent
);
2028 struct NCR_700_Host_Parameters
*hostdata
=
2029 (struct NCR_700_Host_Parameters
*)SHp
->hostdata
[0];
2030 int max_offset
= hostdata
->chip710
2031 ? NCR_710_MAX_OFFSET
: NCR_700_MAX_OFFSET
;
2036 if(offset
> max_offset
)
2037 offset
= max_offset
;
2039 /* if we're currently async, make sure the period is reasonable */
2040 if(spi_offset(STp
) == 0 && (spi_period(STp
) < hostdata
->min_period
||
2041 spi_period(STp
) > 0xff))
2042 spi_period(STp
) = hostdata
->min_period
;
2044 spi_offset(STp
) = offset
;
2045 spi_flags(STp
) &= ~(NCR_700_DEV_NEGOTIATED_SYNC
|
2046 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION
);
2047 spi_flags(STp
) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION
;
2053 NCR_700_slave_configure(struct scsi_device
*SDp
)
2055 struct NCR_700_Host_Parameters
*hostdata
=
2056 (struct NCR_700_Host_Parameters
*)SDp
->host
->hostdata
[0];
2058 /* to do here: allocate memory; build a queue_full list */
2059 if(SDp
->tagged_supported
) {
2060 scsi_set_tag_type(SDp
, MSG_ORDERED_TAG
);
2061 scsi_activate_tcq(SDp
, NCR_700_DEFAULT_TAGS
);
2062 NCR_700_set_tag_neg_state(SDp
, NCR_700_START_TAG_NEGOTIATION
);
2064 /* initialise to default depth */
2065 scsi_adjust_queue_depth(SDp
, 0, SDp
->host
->cmd_per_lun
);
2067 if(hostdata
->fast
) {
2068 /* Find the correct offset and period via domain validation */
2069 if (!spi_initial_dv(SDp
->sdev_target
))
2072 spi_offset(SDp
->sdev_target
) = 0;
2073 spi_period(SDp
->sdev_target
) = 0;
2079 NCR_700_slave_destroy(struct scsi_device
*SDp
)
2081 /* to do here: deallocate memory */
2085 NCR_700_change_queue_depth(struct scsi_device
*SDp
, int depth
)
2087 if (depth
> NCR_700_MAX_TAGS
)
2088 depth
= NCR_700_MAX_TAGS
;
2090 scsi_adjust_queue_depth(SDp
, scsi_get_tag_type(SDp
), depth
);
2094 static int NCR_700_change_queue_type(struct scsi_device
*SDp
, int tag_type
)
2096 int change_tag
= ((tag_type
==0 && scsi_get_tag_type(SDp
) != 0)
2097 || (tag_type
!= 0 && scsi_get_tag_type(SDp
) == 0));
2098 struct NCR_700_Host_Parameters
*hostdata
=
2099 (struct NCR_700_Host_Parameters
*)SDp
->host
->hostdata
[0];
2101 scsi_set_tag_type(SDp
, tag_type
);
2103 /* We have a global (per target) flag to track whether TCQ is
2104 * enabled, so we'll be turning it off for the entire target here.
2105 * our tag algorithm will fail if we mix tagged and untagged commands,
2106 * so quiesce the device before doing this */
2108 scsi_target_quiesce(SDp
->sdev_target
);
2111 /* shift back to the default unqueued number of commands
2112 * (the user can still raise this) */
2113 scsi_deactivate_tcq(SDp
, SDp
->host
->cmd_per_lun
);
2114 hostdata
->tag_negotiated
&= ~(1 << SDp
->id
);
2116 /* Here, we cleared the negotiation flag above, so this
2117 * will force the driver to renegotiate */
2118 scsi_activate_tcq(SDp
, SDp
->queue_depth
);
2120 NCR_700_set_tag_neg_state(SDp
, NCR_700_START_TAG_NEGOTIATION
);
2123 scsi_target_resume(SDp
->sdev_target
);
2129 NCR_700_show_active_tags(struct device
*dev
, char *buf
)
2131 struct scsi_device
*SDp
= to_scsi_device(dev
);
2133 return snprintf(buf
, 20, "%d\n", NCR_700_get_depth(SDp
));
2136 static struct device_attribute NCR_700_active_tags_attr
= {
2138 .name
= "active_tags",
2141 .show
= NCR_700_show_active_tags
,
2144 STATIC
struct device_attribute
*NCR_700_dev_attrs
[] = {
2145 &NCR_700_active_tags_attr
,
2149 EXPORT_SYMBOL(NCR_700_detect
);
2150 EXPORT_SYMBOL(NCR_700_release
);
2151 EXPORT_SYMBOL(NCR_700_intr
);
2153 static struct spi_function_template NCR_700_transport_functions
= {
2154 .set_period
= NCR_700_set_period
,
2156 .set_offset
= NCR_700_set_offset
,
2160 static int __init
NCR_700_init(void)
2162 NCR_700_transport_template
= spi_attach_transport(&NCR_700_transport_functions
);
2163 if(!NCR_700_transport_template
)
2168 static void __exit
NCR_700_exit(void)
2170 spi_release_transport(NCR_700_transport_template
);
2173 module_init(NCR_700_init
);
2174 module_exit(NCR_700_exit
);