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>
131 #include <linux/device.h>
133 #include <asm/system.h>
135 #include <asm/pgtable.h>
136 #include <asm/byteorder.h>
138 #include <scsi/scsi.h>
139 #include <scsi/scsi_cmnd.h>
140 #include <scsi/scsi_dbg.h>
141 #include <scsi/scsi_eh.h>
142 #include <scsi/scsi_host.h>
143 #include <scsi/scsi_tcq.h>
144 #include <scsi/scsi_transport.h>
145 #include <scsi/scsi_transport_spi.h>
149 /* NOTE: For 64 bit drivers there are points in the code where we use
150 * a non dereferenceable pointer to point to a structure in dma-able
151 * memory (which is 32 bits) so that we can use all of the structure
152 * operations but take the address at the end. This macro allows us
153 * to truncate the 64 bit pointer down to 32 bits without the compiler
155 #define to32bit(x) ((__u32)((unsigned long)(x)))
160 #define STATIC static
163 MODULE_AUTHOR("James Bottomley");
164 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
165 MODULE_LICENSE("GPL");
167 /* This is the script */
168 #include "53c700_d.h"
171 STATIC
int NCR_700_queuecommand(struct scsi_cmnd
*, void (*done
)(struct scsi_cmnd
*));
172 STATIC
int NCR_700_abort(struct scsi_cmnd
* SCpnt
);
173 STATIC
int NCR_700_bus_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_bus_reset_handler
= NCR_700_bus_reset
;
334 tpnt
->eh_host_reset_handler
= NCR_700_host_reset
;
335 tpnt
->can_queue
= NCR_700_COMMAND_SLOTS_PER_HOST
;
336 tpnt
->sg_tablesize
= NCR_700_SG_SEGMENTS
;
337 tpnt
->cmd_per_lun
= NCR_700_CMD_PER_LUN
;
338 tpnt
->use_clustering
= ENABLE_CLUSTERING
;
339 tpnt
->slave_configure
= NCR_700_slave_configure
;
340 tpnt
->slave_destroy
= NCR_700_slave_destroy
;
341 tpnt
->change_queue_depth
= NCR_700_change_queue_depth
;
342 tpnt
->change_queue_type
= NCR_700_change_queue_type
;
344 if(tpnt
->name
== NULL
)
345 tpnt
->name
= "53c700";
346 if(tpnt
->proc_name
== NULL
)
347 tpnt
->proc_name
= "53c700";
350 host
= scsi_host_alloc(tpnt
, 4);
353 memset(hostdata
->slots
, 0, sizeof(struct NCR_700_command_slot
)
354 * NCR_700_COMMAND_SLOTS_PER_HOST
);
355 for(j
= 0; j
< NCR_700_COMMAND_SLOTS_PER_HOST
; j
++) {
356 dma_addr_t offset
= (dma_addr_t
)((unsigned long)&hostdata
->slots
[j
].SG
[0]
357 - (unsigned long)&hostdata
->slots
[0].SG
[0]);
358 hostdata
->slots
[j
].pSG
= (struct NCR_700_SG_List
*)((unsigned long)(pSlots
+ offset
));
360 hostdata
->free_list
= &hostdata
->slots
[j
];
362 hostdata
->slots
[j
-1].ITL_forw
= &hostdata
->slots
[j
];
363 hostdata
->slots
[j
].state
= NCR_700_SLOT_FREE
;
366 for(j
= 0; j
< sizeof(SCRIPT
)/sizeof(SCRIPT
[0]); j
++) {
367 script
[j
] = bS_to_host(SCRIPT
[j
]);
370 /* adjust all labels to be bus physical */
371 for(j
= 0; j
< PATCHES
; j
++) {
372 script
[LABELPATCHES
[j
]] = bS_to_host(pScript
+ SCRIPT
[LABELPATCHES
[j
]]);
374 /* now patch up fixed addresses. */
375 script_patch_32(script
, MessageLocation
,
376 pScript
+ MSGOUT_OFFSET
);
377 script_patch_32(script
, StatusAddress
,
378 pScript
+ STATUS_OFFSET
);
379 script_patch_32(script
, ReceiveMsgAddress
,
380 pScript
+ MSGIN_OFFSET
);
382 hostdata
->script
= script
;
383 hostdata
->pScript
= pScript
;
384 dma_sync_single_for_device(hostdata
->dev
, pScript
, sizeof(SCRIPT
), DMA_TO_DEVICE
);
385 hostdata
->state
= NCR_700_HOST_FREE
;
386 hostdata
->cmd
= NULL
;
388 host
->max_lun
= NCR_700_MAX_LUNS
;
389 BUG_ON(NCR_700_transport_template
== NULL
);
390 host
->transportt
= NCR_700_transport_template
;
391 host
->unique_id
= (unsigned long)hostdata
->base
;
392 hostdata
->eh_complete
= NULL
;
393 host
->hostdata
[0] = (unsigned long)hostdata
;
395 NCR_700_writeb(0xff, host
, CTEST9_REG
);
396 if(hostdata
->chip710
)
397 hostdata
->rev
= (NCR_700_readb(host
, CTEST8_REG
)>>4) & 0x0f;
399 hostdata
->rev
= (NCR_700_readb(host
, CTEST7_REG
)>>4) & 0x0f;
400 hostdata
->fast
= (NCR_700_readb(host
, CTEST9_REG
) == 0);
402 printk(KERN_NOTICE
"53c700: Version " NCR_700_VERSION
" By James.Bottomley@HansenPartnership.com\n");
405 printk(KERN_NOTICE
"scsi%d: %s rev %d %s\n", host
->host_no
,
406 hostdata
->chip710
? "53c710" :
407 (hostdata
->fast
? "53c700-66" : "53c700"),
408 hostdata
->rev
, hostdata
->differential
?
409 "(Differential)" : "");
411 NCR_700_chip_reset(host
);
413 if (scsi_add_host(host
, dev
)) {
414 dev_printk(KERN_ERR
, dev
, "53c700: scsi_add_host failed\n");
419 spi_signalling(host
) = hostdata
->differential
? SPI_SIGNAL_HVD
:
426 NCR_700_release(struct Scsi_Host
*host
)
428 struct NCR_700_Host_Parameters
*hostdata
=
429 (struct NCR_700_Host_Parameters
*)host
->hostdata
[0];
431 dma_free_noncoherent(hostdata
->dev
, TOTAL_MEM_SIZE
,
432 hostdata
->script
, hostdata
->pScript
);
437 NCR_700_identify(int can_disconnect
, __u8 lun
)
439 return IDENTIFY_BASE
|
440 ((can_disconnect
) ? 0x40 : 0) |
441 (lun
& NCR_700_LUN_MASK
);
445 * Function : static int data_residual (Scsi_Host *host)
447 * Purpose : return residual data count of what's in the chip. If you
448 * really want to know what this function is doing, it's almost a
449 * direct transcription of the algorithm described in the 53c710
450 * guide, except that the DBC and DFIFO registers are only 6 bits
453 * Inputs : host - SCSI host */
455 NCR_700_data_residual (struct Scsi_Host
*host
) {
456 struct NCR_700_Host_Parameters
*hostdata
=
457 (struct NCR_700_Host_Parameters
*)host
->hostdata
[0];
458 int count
, synchronous
= 0;
461 if(hostdata
->chip710
) {
462 count
= ((NCR_700_readb(host
, DFIFO_REG
) & 0x7f) -
463 (NCR_700_readl(host
, DBC_REG
) & 0x7f)) & 0x7f;
465 count
= ((NCR_700_readb(host
, DFIFO_REG
) & 0x3f) -
466 (NCR_700_readl(host
, DBC_REG
) & 0x3f)) & 0x3f;
470 synchronous
= NCR_700_readb(host
, SXFER_REG
) & 0x0f;
472 /* get the data direction */
473 ddir
= NCR_700_readb(host
, CTEST0_REG
) & 0x01;
478 count
+= (NCR_700_readb(host
, SSTAT2_REG
) & 0xf0) >> 4;
480 if (NCR_700_readb(host
, SSTAT1_REG
) & SIDL_REG_FULL
)
484 __u8 sstat
= NCR_700_readb(host
, SSTAT1_REG
);
485 if (sstat
& SODL_REG_FULL
)
487 if (synchronous
&& (sstat
& SODR_REG_FULL
))
492 printk("RESIDUAL IS %d (ddir %d)\n", count
, ddir
);
497 /* print out the SCSI wires and corresponding phase from the SBCL register
500 sbcl_to_string(__u8 sbcl
)
503 static char ret
[256];
508 strcat(ret
, NCR_700_SBCL_bits
[i
]);
510 strcat(ret
, NCR_700_SBCL_to_phase
[sbcl
& 0x07]);
515 bitmap_to_number(__u8 bitmap
)
519 for(i
=0; i
<8 && !(bitmap
&(1<<i
)); i
++)
524 /* Pull a slot off the free list */
525 STATIC
struct NCR_700_command_slot
*
526 find_empty_slot(struct NCR_700_Host_Parameters
*hostdata
)
528 struct NCR_700_command_slot
*slot
= hostdata
->free_list
;
532 if(hostdata
->command_slot_count
!= NCR_700_COMMAND_SLOTS_PER_HOST
)
533 printk(KERN_ERR
"SLOTS FULL, but count is %d, should be %d\n", hostdata
->command_slot_count
, NCR_700_COMMAND_SLOTS_PER_HOST
);
537 if(slot
->state
!= NCR_700_SLOT_FREE
)
539 printk(KERN_ERR
"BUSY SLOT ON FREE LIST!!!\n");
542 hostdata
->free_list
= slot
->ITL_forw
;
543 slot
->ITL_forw
= NULL
;
546 /* NOTE: set the state to busy here, not queued, since this
547 * indicates the slot is in use and cannot be run by the IRQ
548 * finish routine. If we cannot queue the command when it
549 * is properly build, we then change to NCR_700_SLOT_QUEUED */
550 slot
->state
= NCR_700_SLOT_BUSY
;
551 hostdata
->command_slot_count
++;
557 free_slot(struct NCR_700_command_slot
*slot
,
558 struct NCR_700_Host_Parameters
*hostdata
)
560 if((slot
->state
& NCR_700_SLOT_MASK
) != NCR_700_SLOT_MAGIC
) {
561 printk(KERN_ERR
"53c700: SLOT %p is not MAGIC!!!\n", slot
);
563 if(slot
->state
== NCR_700_SLOT_FREE
) {
564 printk(KERN_ERR
"53c700: SLOT %p is FREE!!!\n", slot
);
567 slot
->resume_offset
= 0;
569 slot
->state
= NCR_700_SLOT_FREE
;
570 slot
->ITL_forw
= hostdata
->free_list
;
571 hostdata
->free_list
= slot
;
572 hostdata
->command_slot_count
--;
576 /* This routine really does very little. The command is indexed on
577 the ITL and (if tagged) the ITLQ lists in _queuecommand */
579 save_for_reselection(struct NCR_700_Host_Parameters
*hostdata
,
580 struct scsi_cmnd
*SCp
, __u32 dsp
)
582 /* Its just possible that this gets executed twice */
584 struct NCR_700_command_slot
*slot
=
585 (struct NCR_700_command_slot
*)SCp
->host_scribble
;
587 slot
->resume_offset
= dsp
;
589 hostdata
->state
= NCR_700_HOST_FREE
;
590 hostdata
->cmd
= NULL
;
594 NCR_700_unmap(struct NCR_700_Host_Parameters
*hostdata
, struct scsi_cmnd
*SCp
,
595 struct NCR_700_command_slot
*slot
)
597 if(SCp
->sc_data_direction
!= DMA_NONE
&&
598 SCp
->sc_data_direction
!= DMA_BIDIRECTIONAL
) {
600 dma_unmap_sg(hostdata
->dev
, SCp
->buffer
,
601 SCp
->use_sg
, SCp
->sc_data_direction
);
603 dma_unmap_single(hostdata
->dev
, slot
->dma_handle
,
604 SCp
->request_bufflen
,
605 SCp
->sc_data_direction
);
611 NCR_700_scsi_done(struct NCR_700_Host_Parameters
*hostdata
,
612 struct scsi_cmnd
*SCp
, int result
)
614 hostdata
->state
= NCR_700_HOST_FREE
;
615 hostdata
->cmd
= NULL
;
618 struct NCR_700_command_slot
*slot
=
619 (struct NCR_700_command_slot
*)SCp
->host_scribble
;
621 NCR_700_unmap(hostdata
, SCp
, slot
);
622 dma_unmap_single(hostdata
->dev
, slot
->pCmd
,
623 sizeof(SCp
->cmnd
), DMA_TO_DEVICE
);
624 if(SCp
->cmnd
[0] == REQUEST_SENSE
&& SCp
->cmnd
[6] == NCR_700_INTERNAL_SENSE_MAGIC
) {
626 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
627 SCp
, SCp
->cmnd
[7], result
);
628 scsi_print_sense("53c700", SCp
);
631 /* restore the old result if the request sense was
634 result
= SCp
->cmnd
[7];
635 /* now restore the original command */
636 memcpy((void *) SCp
->cmnd
, (void *) SCp
->data_cmnd
,
637 sizeof(SCp
->data_cmnd
));
638 SCp
->request_buffer
= SCp
->buffer
;
639 SCp
->request_bufflen
= SCp
->bufflen
;
640 SCp
->use_sg
= SCp
->old_use_sg
;
641 SCp
->cmd_len
= SCp
->old_cmd_len
;
642 SCp
->sc_data_direction
= SCp
->sc_old_data_direction
;
643 SCp
->underflow
= SCp
->old_underflow
;
646 free_slot(slot
, hostdata
);
648 if(NCR_700_get_depth(SCp
->device
) == 0 ||
649 NCR_700_get_depth(SCp
->device
) > SCp
->device
->queue_depth
)
650 printk(KERN_ERR
"Invalid depth in NCR_700_scsi_done(): %d\n",
651 NCR_700_get_depth(SCp
->device
));
652 #endif /* NCR_700_DEBUG */
653 NCR_700_set_depth(SCp
->device
, NCR_700_get_depth(SCp
->device
) - 1);
655 SCp
->host_scribble
= NULL
;
656 SCp
->result
= result
;
659 printk(KERN_ERR
"53c700: SCSI DONE HAS NULL SCp\n");
665 NCR_700_internal_bus_reset(struct Scsi_Host
*host
)
668 NCR_700_writeb(ASSERT_RST
, host
, SCNTL1_REG
);
670 NCR_700_writeb(0, host
, SCNTL1_REG
);
675 NCR_700_chip_setup(struct Scsi_Host
*host
)
677 struct NCR_700_Host_Parameters
*hostdata
=
678 (struct NCR_700_Host_Parameters
*)host
->hostdata
[0];
679 __u32 dcntl_extra
= 0;
681 __u8 min_xferp
= (hostdata
->chip710
? NCR_710_MIN_XFERP
: NCR_700_MIN_XFERP
);
683 if(hostdata
->chip710
) {
684 __u8 burst_disable
= hostdata
->burst_disable
686 dcntl_extra
= COMPAT_700_MODE
;
688 NCR_700_writeb(dcntl_extra
, host
, DCNTL_REG
);
689 NCR_700_writeb(BURST_LENGTH_8
| hostdata
->dmode_extra
,
690 host
, DMODE_710_REG
);
691 NCR_700_writeb(burst_disable
| (hostdata
->differential
?
692 DIFF
: 0), host
, CTEST7_REG
);
693 NCR_700_writeb(BTB_TIMER_DISABLE
, host
, CTEST0_REG
);
694 NCR_700_writeb(FULL_ARBITRATION
| ENABLE_PARITY
| PARITY
695 | AUTO_ATN
, host
, SCNTL0_REG
);
697 NCR_700_writeb(BURST_LENGTH_8
| hostdata
->dmode_extra
,
698 host
, DMODE_700_REG
);
699 NCR_700_writeb(hostdata
->differential
?
700 DIFF
: 0, host
, CTEST7_REG
);
702 /* this is for 700-66, does nothing on 700 */
703 NCR_700_writeb(LAST_DIS_ENBL
| ENABLE_ACTIVE_NEGATION
704 | GENERATE_RECEIVE_PARITY
, host
,
707 NCR_700_writeb(FULL_ARBITRATION
| ENABLE_PARITY
708 | PARITY
| AUTO_ATN
, host
, SCNTL0_REG
);
712 NCR_700_writeb(1 << host
->this_id
, host
, SCID_REG
);
713 NCR_700_writeb(0, host
, SBCL_REG
);
714 NCR_700_writeb(ASYNC_OPERATION
, host
, SXFER_REG
);
716 NCR_700_writeb(PHASE_MM_INT
| SEL_TIMEOUT_INT
| GROSS_ERR_INT
| UX_DISC_INT
717 | RST_INT
| PAR_ERR_INT
| SELECT_INT
, host
, SIEN_REG
);
719 NCR_700_writeb(ABORT_INT
| INT_INST_INT
| ILGL_INST_INT
, host
, DIEN_REG
);
720 NCR_700_writeb(ENABLE_SELECT
, host
, SCNTL1_REG
);
721 if(hostdata
->clock
> 75) {
722 printk(KERN_ERR
"53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata
->clock
);
723 /* do the best we can, but the async clock will be out
724 * of spec: sync divider 2, async divider 3 */
725 DEBUG(("53c700: sync 2 async 3\n"));
726 NCR_700_writeb(SYNC_DIV_2_0
, host
, SBCL_REG
);
727 NCR_700_writeb(ASYNC_DIV_3_0
| dcntl_extra
, host
, DCNTL_REG
);
728 hostdata
->sync_clock
= hostdata
->clock
/2;
729 } else if(hostdata
->clock
> 50 && hostdata
->clock
<= 75) {
730 /* sync divider 1.5, async divider 3 */
731 DEBUG(("53c700: sync 1.5 async 3\n"));
732 NCR_700_writeb(SYNC_DIV_1_5
, host
, SBCL_REG
);
733 NCR_700_writeb(ASYNC_DIV_3_0
| dcntl_extra
, host
, DCNTL_REG
);
734 hostdata
->sync_clock
= hostdata
->clock
*2;
735 hostdata
->sync_clock
/= 3;
737 } else if(hostdata
->clock
> 37 && hostdata
->clock
<= 50) {
738 /* sync divider 1, async divider 2 */
739 DEBUG(("53c700: sync 1 async 2\n"));
740 NCR_700_writeb(SYNC_DIV_1_0
, host
, SBCL_REG
);
741 NCR_700_writeb(ASYNC_DIV_2_0
| dcntl_extra
, host
, DCNTL_REG
);
742 hostdata
->sync_clock
= hostdata
->clock
;
743 } else if(hostdata
->clock
> 25 && hostdata
->clock
<=37) {
744 /* sync divider 1, async divider 1.5 */
745 DEBUG(("53c700: sync 1 async 1.5\n"));
746 NCR_700_writeb(SYNC_DIV_1_0
, host
, SBCL_REG
);
747 NCR_700_writeb(ASYNC_DIV_1_5
| dcntl_extra
, host
, DCNTL_REG
);
748 hostdata
->sync_clock
= hostdata
->clock
;
750 DEBUG(("53c700: sync 1 async 1\n"));
751 NCR_700_writeb(SYNC_DIV_1_0
, host
, SBCL_REG
);
752 NCR_700_writeb(ASYNC_DIV_1_0
| dcntl_extra
, host
, DCNTL_REG
);
753 /* sync divider 1, async divider 1 */
754 hostdata
->sync_clock
= hostdata
->clock
;
756 /* Calculate the actual minimum period that can be supported
757 * by our synchronous clock speed. See the 710 manual for
758 * exact details of this calculation which is based on a
759 * setting of the SXFER register */
760 min_period
= 1000*(4+min_xferp
)/(4*hostdata
->sync_clock
);
761 hostdata
->min_period
= NCR_700_MIN_PERIOD
;
762 if(min_period
> NCR_700_MIN_PERIOD
)
763 hostdata
->min_period
= min_period
;
767 NCR_700_chip_reset(struct Scsi_Host
*host
)
769 struct NCR_700_Host_Parameters
*hostdata
=
770 (struct NCR_700_Host_Parameters
*)host
->hostdata
[0];
771 if(hostdata
->chip710
) {
772 NCR_700_writeb(SOFTWARE_RESET_710
, host
, ISTAT_REG
);
775 NCR_700_writeb(0, host
, ISTAT_REG
);
777 NCR_700_writeb(SOFTWARE_RESET
, host
, DCNTL_REG
);
780 NCR_700_writeb(0, host
, DCNTL_REG
);
785 NCR_700_chip_setup(host
);
788 /* The heart of the message processing engine is that the instruction
789 * immediately after the INT is the normal case (and so must be CLEAR
790 * ACK). If we want to do something else, we call that routine in
791 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
792 * ACK) so that the routine returns correctly to resume its activity
795 process_extended_message(struct Scsi_Host
*host
,
796 struct NCR_700_Host_Parameters
*hostdata
,
797 struct scsi_cmnd
*SCp
, __u32 dsp
, __u32 dsps
)
799 __u32 resume_offset
= dsp
, temp
= dsp
+ 8;
800 __u8 pun
= 0xff, lun
= 0xff;
803 pun
= SCp
->device
->id
;
804 lun
= SCp
->device
->lun
;
807 switch(hostdata
->msgin
[2]) {
809 if(SCp
!= NULL
&& NCR_700_is_flag_set(SCp
->device
, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION
)) {
810 struct scsi_target
*starget
= SCp
->device
->sdev_target
;
811 __u8 period
= hostdata
->msgin
[3];
812 __u8 offset
= hostdata
->msgin
[4];
814 if(offset
== 0 || period
== 0) {
819 spi_offset(starget
) = offset
;
820 spi_period(starget
) = period
;
822 if(NCR_700_is_flag_set(SCp
->device
, NCR_700_DEV_PRINT_SYNC_NEGOTIATION
)) {
823 spi_display_xfer_agreement(starget
);
824 NCR_700_clear_flag(SCp
->device
, NCR_700_DEV_PRINT_SYNC_NEGOTIATION
);
827 NCR_700_set_flag(SCp
->device
, NCR_700_DEV_NEGOTIATED_SYNC
);
828 NCR_700_clear_flag(SCp
->device
, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION
);
830 NCR_700_writeb(NCR_700_get_SXFER(SCp
->device
),
834 /* SDTR message out of the blue, reject it */
835 shost_printk(KERN_WARNING
, host
,
836 "Unexpected SDTR msg\n");
837 hostdata
->msgout
[0] = A_REJECT_MSG
;
838 dma_cache_sync(hostdata
->msgout
, 1, DMA_TO_DEVICE
);
839 script_patch_16(hostdata
->script
, MessageCount
, 1);
840 /* SendMsgOut returns, so set up the return
842 resume_offset
= hostdata
->pScript
+ Ent_SendMessageWithATN
;
847 printk(KERN_INFO
"scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
848 host
->host_no
, pun
, lun
);
849 hostdata
->msgout
[0] = A_REJECT_MSG
;
850 dma_cache_sync(hostdata
->msgout
, 1, DMA_TO_DEVICE
);
851 script_patch_16(hostdata
->script
, MessageCount
, 1);
852 resume_offset
= hostdata
->pScript
+ Ent_SendMessageWithATN
;
857 printk(KERN_INFO
"scsi%d (%d:%d): Unexpected message %s: ",
858 host
->host_no
, pun
, lun
,
859 NCR_700_phase
[(dsps
& 0xf00) >> 8]);
860 spi_print_msg(hostdata
->msgin
);
863 hostdata
->msgout
[0] = A_REJECT_MSG
;
864 dma_cache_sync(hostdata
->msgout
, 1, DMA_TO_DEVICE
);
865 script_patch_16(hostdata
->script
, MessageCount
, 1);
866 /* SendMsgOut returns, so set up the return
868 resume_offset
= hostdata
->pScript
+ Ent_SendMessageWithATN
;
870 NCR_700_writel(temp
, host
, TEMP_REG
);
871 return resume_offset
;
875 process_message(struct Scsi_Host
*host
, struct NCR_700_Host_Parameters
*hostdata
,
876 struct scsi_cmnd
*SCp
, __u32 dsp
, __u32 dsps
)
878 /* work out where to return to */
879 __u32 temp
= dsp
+ 8, resume_offset
= dsp
;
880 __u8 pun
= 0xff, lun
= 0xff;
883 pun
= SCp
->device
->id
;
884 lun
= SCp
->device
->lun
;
888 printk("scsi%d (%d:%d): message %s: ", host
->host_no
, pun
, lun
,
889 NCR_700_phase
[(dsps
& 0xf00) >> 8]);
890 spi_print_msg(hostdata
->msgin
);
894 switch(hostdata
->msgin
[0]) {
897 resume_offset
= process_extended_message(host
, hostdata
, SCp
,
902 if(SCp
!= NULL
&& NCR_700_is_flag_set(SCp
->device
, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION
)) {
903 /* Rejected our sync negotiation attempt */
904 spi_period(SCp
->device
->sdev_target
) =
905 spi_offset(SCp
->device
->sdev_target
) = 0;
906 NCR_700_set_flag(SCp
->device
, NCR_700_DEV_NEGOTIATED_SYNC
);
907 NCR_700_clear_flag(SCp
->device
, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION
);
908 } else if(SCp
!= NULL
&& NCR_700_get_tag_neg_state(SCp
->device
) == NCR_700_DURING_TAG_NEGOTIATION
) {
909 /* rejected our first simple tag message */
910 scmd_printk(KERN_WARNING
, SCp
,
911 "Rejected first tag queue attempt, turning off tag queueing\n");
912 /* we're done negotiating */
913 NCR_700_set_tag_neg_state(SCp
->device
, NCR_700_FINISHED_TAG_NEGOTIATION
);
914 hostdata
->tag_negotiated
&= ~(1<<scmd_id(SCp
));
915 SCp
->device
->tagged_supported
= 0;
916 scsi_deactivate_tcq(SCp
->device
, host
->cmd_per_lun
);
918 shost_printk(KERN_WARNING
, host
,
919 "(%d:%d) Unexpected REJECT Message %s\n",
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 spi_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 scmd_printk(KERN_ERR
, SCp
,
990 "broken device is looping in contingent allegiance: ignoring\n");
991 NCR_700_scsi_done(hostdata
, SCp
, hostdata
->status
[0]);
994 scsi_print_command(SCp
);
995 printk(" cmd %p has status %d, requesting sense\n",
996 SCp
, hostdata
->status
[0]);
998 /* we can destroy the command here
999 * because the contingent allegiance
1000 * condition will cause a retry which
1001 * will re-copy the command from the
1002 * saved data_cmnd. We also unmap any
1003 * data associated with the command
1005 NCR_700_unmap(hostdata
, SCp
, slot
);
1007 SCp
->cmnd
[0] = REQUEST_SENSE
;
1008 SCp
->cmnd
[1] = (SCp
->device
->lun
& 0x7) << 5;
1011 SCp
->cmnd
[4] = sizeof(SCp
->sense_buffer
);
1014 /* Here's a quiet hack: the
1015 * REQUEST_SENSE command is six bytes,
1016 * so store a flag indicating that
1017 * this was an internal sense request
1018 * and the original status at the end
1020 SCp
->cmnd
[6] = NCR_700_INTERNAL_SENSE_MAGIC
;
1021 SCp
->cmnd
[7] = hostdata
->status
[0];
1023 SCp
->sc_data_direction
= DMA_FROM_DEVICE
;
1024 dma_sync_single_for_device(hostdata
->dev
, slot
->pCmd
,
1025 SCp
->cmd_len
, DMA_TO_DEVICE
);
1026 SCp
->request_bufflen
= sizeof(SCp
->sense_buffer
);
1027 slot
->dma_handle
= dma_map_single(hostdata
->dev
, SCp
->sense_buffer
, sizeof(SCp
->sense_buffer
), DMA_FROM_DEVICE
);
1028 slot
->SG
[0].ins
= bS_to_host(SCRIPT_MOVE_DATA_IN
| sizeof(SCp
->sense_buffer
));
1029 slot
->SG
[0].pAddr
= bS_to_host(slot
->dma_handle
);
1030 slot
->SG
[1].ins
= bS_to_host(SCRIPT_RETURN
);
1031 slot
->SG
[1].pAddr
= 0;
1032 slot
->resume_offset
= hostdata
->pScript
;
1033 dma_cache_sync(slot
->SG
, sizeof(slot
->SG
[0])*2, DMA_TO_DEVICE
);
1034 dma_cache_sync(SCp
->sense_buffer
, sizeof(SCp
->sense_buffer
), DMA_FROM_DEVICE
);
1036 /* queue the command for reissue */
1037 slot
->state
= NCR_700_SLOT_QUEUED
;
1038 hostdata
->state
= NCR_700_HOST_FREE
;
1039 hostdata
->cmd
= NULL
;
1042 // Currently rely on the mid layer evaluation
1043 // of the tag queuing capability
1045 //if(status_byte(hostdata->status[0]) == GOOD &&
1046 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1047 // /* Piggy back the tag queueing support
1048 // * on this command */
1049 // dma_sync_single_for_cpu(hostdata->dev,
1050 // slot->dma_handle,
1051 // SCp->request_bufflen,
1052 // DMA_FROM_DEVICE);
1053 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1054 // scmd_printk(KERN_INFO, SCp,
1055 // "Enabling Tag Command Queuing\n");
1056 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1057 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1059 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1060 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1063 NCR_700_scsi_done(hostdata
, SCp
, hostdata
->status
[0]);
1065 } else if((dsps
& 0xfffff0f0) == A_UNEXPECTED_PHASE
) {
1066 __u8 i
= (dsps
& 0xf00) >> 8;
1068 scmd_printk(KERN_ERR
, SCp
, "UNEXPECTED PHASE %s (%s)\n",
1070 sbcl_to_string(NCR_700_readb(host
, SBCL_REG
)));
1071 scmd_printk(KERN_ERR
, SCp
, " len = %d, cmd =",
1073 scsi_print_command(SCp
);
1075 NCR_700_internal_bus_reset(host
);
1076 } else if((dsps
& 0xfffff000) == A_FATAL
) {
1077 int i
= (dsps
& 0xfff);
1079 printk(KERN_ERR
"scsi%d: (%d:%d) FATAL ERROR: %s\n",
1080 host
->host_no
, pun
, lun
, NCR_700_fatal_messages
[i
]);
1081 if(dsps
== A_FATAL_ILLEGAL_MSG_LENGTH
) {
1082 printk(KERN_ERR
" msg begins %02x %02x\n",
1083 hostdata
->msgin
[0], hostdata
->msgin
[1]);
1085 NCR_700_internal_bus_reset(host
);
1086 } else if((dsps
& 0xfffff0f0) == A_DISCONNECT
) {
1087 #ifdef NCR_700_DEBUG
1088 __u8 i
= (dsps
& 0xf00) >> 8;
1090 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1091 host
->host_no
, pun
, lun
,
1092 i
, NCR_700_phase
[i
]);
1094 save_for_reselection(hostdata
, SCp
, dsp
);
1096 } else if(dsps
== A_RESELECTION_IDENTIFIED
) {
1098 struct NCR_700_command_slot
*slot
;
1099 __u8 reselection_id
= hostdata
->reselection_id
;
1100 struct scsi_device
*SDp
;
1102 lun
= hostdata
->msgin
[0] & 0x1f;
1104 hostdata
->reselection_id
= 0xff;
1105 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1106 host
->host_no
, reselection_id
, lun
));
1107 /* clear the reselection indicator */
1108 SDp
= __scsi_device_lookup(host
, 0, reselection_id
, lun
);
1109 if(unlikely(SDp
== NULL
)) {
1110 printk(KERN_ERR
"scsi%d: (%d:%d) HAS NO device\n",
1111 host
->host_no
, reselection_id
, lun
);
1114 if(hostdata
->msgin
[1] == A_SIMPLE_TAG_MSG
) {
1115 struct scsi_cmnd
*SCp
= scsi_find_tag(SDp
, hostdata
->msgin
[2]);
1116 if(unlikely(SCp
== NULL
)) {
1117 printk(KERN_ERR
"scsi%d: (%d:%d) no saved request for tag %d\n",
1118 host
->host_no
, reselection_id
, lun
, hostdata
->msgin
[2]);
1122 slot
= (struct NCR_700_command_slot
*)SCp
->host_scribble
;
1123 DDEBUG(KERN_DEBUG
, SDp
,
1124 "reselection is tag %d, slot %p(%d)\n",
1125 hostdata
->msgin
[2], slot
, slot
->tag
);
1127 struct scsi_cmnd
*SCp
= scsi_find_tag(SDp
, SCSI_NO_TAG
);
1128 if(unlikely(SCp
== NULL
)) {
1129 sdev_printk(KERN_ERR
, SDp
,
1130 "no saved request for untagged cmd\n");
1133 slot
= (struct NCR_700_command_slot
*)SCp
->host_scribble
;
1137 printk(KERN_ERR
"scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1138 host
->host_no
, reselection_id
, lun
,
1139 hostdata
->msgin
[0], hostdata
->msgin
[1],
1140 hostdata
->msgin
[2]);
1142 if(hostdata
->state
!= NCR_700_HOST_BUSY
)
1143 printk(KERN_ERR
"scsi%d: FATAL, host not busy during valid reselection!\n",
1145 resume_offset
= slot
->resume_offset
;
1146 hostdata
->cmd
= slot
->cmnd
;
1148 /* re-patch for this command */
1149 script_patch_32_abs(hostdata
->script
, CommandAddress
,
1151 script_patch_16(hostdata
->script
,
1152 CommandCount
, slot
->cmnd
->cmd_len
);
1153 script_patch_32_abs(hostdata
->script
, SGScriptStartAddress
,
1154 to32bit(&slot
->pSG
[0].ins
));
1156 /* Note: setting SXFER only works if we're
1157 * still in the MESSAGE phase, so it is vital
1158 * that ACK is still asserted when we process
1159 * the reselection message. The resume offset
1160 * should therefore always clear ACK */
1161 NCR_700_writeb(NCR_700_get_SXFER(hostdata
->cmd
->device
),
1163 dma_cache_sync(hostdata
->msgin
,
1164 MSG_ARRAY_SIZE
, DMA_FROM_DEVICE
);
1165 dma_cache_sync(hostdata
->msgout
,
1166 MSG_ARRAY_SIZE
, DMA_TO_DEVICE
);
1167 /* I'm just being paranoid here, the command should
1168 * already have been flushed from the cache */
1169 dma_cache_sync(slot
->cmnd
->cmnd
,
1170 slot
->cmnd
->cmd_len
, DMA_TO_DEVICE
);
1175 } else if(dsps
== A_RESELECTED_DURING_SELECTION
) {
1177 /* This section is full of debugging code because I've
1178 * never managed to reach it. I think what happens is
1179 * that, because the 700 runs with selection
1180 * interrupts enabled the whole time that we take a
1181 * selection interrupt before we manage to get to the
1182 * reselected script interrupt */
1184 __u8 reselection_id
= NCR_700_readb(host
, SFBR_REG
);
1185 struct NCR_700_command_slot
*slot
;
1187 /* Take out our own ID */
1188 reselection_id
&= ~(1<<host
->this_id
);
1190 /* I've never seen this happen, so keep this as a printk rather
1192 printk(KERN_INFO
"scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1193 host
->host_no
, reselection_id
, lun
, dsp
, dsp
- hostdata
->pScript
, hostdata
->state
, hostdata
->command_slot_count
);
1196 /* FIXME: DEBUGGING CODE */
1197 __u32 SG
= (__u32
)bS_to_cpu(hostdata
->script
[A_SGScriptStartAddress_used
[0]]);
1200 for(i
=0; i
< NCR_700_COMMAND_SLOTS_PER_HOST
; i
++) {
1201 if(SG
>= to32bit(&hostdata
->slots
[i
].pSG
[0])
1202 && SG
<= to32bit(&hostdata
->slots
[i
].pSG
[NCR_700_SG_SEGMENTS
]))
1205 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
);
1206 SCp
= hostdata
->slots
[i
].cmnd
;
1210 slot
= (struct NCR_700_command_slot
*)SCp
->host_scribble
;
1211 /* change slot from busy to queued to redo command */
1212 slot
->state
= NCR_700_SLOT_QUEUED
;
1214 hostdata
->cmd
= NULL
;
1216 if(reselection_id
== 0) {
1217 if(hostdata
->reselection_id
== 0xff) {
1218 printk(KERN_ERR
"scsi%d: Invalid reselection during selection!!\n", host
->host_no
);
1221 printk(KERN_ERR
"scsi%d: script reselected and we took a selection interrupt\n",
1223 reselection_id
= hostdata
->reselection_id
;
1227 /* convert to real ID */
1228 reselection_id
= bitmap_to_number(reselection_id
);
1230 hostdata
->reselection_id
= reselection_id
;
1231 /* just in case we have a stale simple tag message, clear it */
1232 hostdata
->msgin
[1] = 0;
1233 dma_cache_sync(hostdata
->msgin
,
1234 MSG_ARRAY_SIZE
, DMA_BIDIRECTIONAL
);
1235 if(hostdata
->tag_negotiated
& (1<<reselection_id
)) {
1236 resume_offset
= hostdata
->pScript
+ Ent_GetReselectionWithTag
;
1238 resume_offset
= hostdata
->pScript
+ Ent_GetReselectionData
;
1240 } else if(dsps
== A_COMPLETED_SELECTION_AS_TARGET
) {
1241 /* we've just disconnected from the bus, do nothing since
1242 * a return here will re-run the queued command slot
1243 * that may have been interrupted by the initial selection */
1244 DEBUG((" SELECTION COMPLETED\n"));
1245 } else if((dsps
& 0xfffff0f0) == A_MSG_IN
) {
1246 resume_offset
= process_message(host
, hostdata
, SCp
,
1248 } else if((dsps
& 0xfffff000) == 0) {
1249 __u8 i
= (dsps
& 0xf0) >> 4, j
= (dsps
& 0xf00) >> 8;
1250 printk(KERN_ERR
"scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1251 host
->host_no
, pun
, lun
, NCR_700_condition
[i
],
1252 NCR_700_phase
[j
], dsp
- hostdata
->pScript
);
1254 scsi_print_command(SCp
);
1257 for(i
= 0; i
< SCp
->use_sg
+ 1; i
++) {
1258 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
);
1262 NCR_700_internal_bus_reset(host
);
1263 } else if((dsps
& 0xfffff000) == A_DEBUG_INTERRUPT
) {
1264 printk(KERN_NOTICE
"scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1265 host
->host_no
, pun
, lun
, dsps
& 0xfff, dsp
, dsp
- hostdata
->pScript
);
1266 resume_offset
= dsp
;
1268 printk(KERN_ERR
"scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1269 host
->host_no
, pun
, lun
, dsps
, dsp
- hostdata
->pScript
);
1270 NCR_700_internal_bus_reset(host
);
1272 return resume_offset
;
1275 /* We run the 53c700 with selection interrupts always enabled. This
1276 * means that the chip may be selected as soon as the bus frees. On a
1277 * busy bus, this can be before the scripts engine finishes its
1278 * processing. Therefore, part of the selection processing has to be
1279 * to find out what the scripts engine is doing and complete the
1280 * function if necessary (i.e. process the pending disconnect or save
1281 * the interrupted initial selection */
1283 process_selection(struct Scsi_Host
*host
, __u32 dsp
)
1285 __u8 id
= 0; /* Squash compiler warning */
1287 __u32 resume_offset
= 0;
1288 struct NCR_700_Host_Parameters
*hostdata
=
1289 (struct NCR_700_Host_Parameters
*)host
->hostdata
[0];
1290 struct scsi_cmnd
*SCp
= hostdata
->cmd
;
1293 for(count
= 0; count
< 5; count
++) {
1294 id
= NCR_700_readb(host
, hostdata
->chip710
?
1295 CTEST9_REG
: SFBR_REG
);
1297 /* Take out our own ID */
1298 id
&= ~(1<<host
->this_id
);
1303 sbcl
= NCR_700_readb(host
, SBCL_REG
);
1304 if((sbcl
& SBCL_IO
) == 0) {
1305 /* mark as having been selected rather than reselected */
1308 /* convert to real ID */
1309 hostdata
->reselection_id
= id
= bitmap_to_number(id
);
1310 DEBUG(("scsi%d: Reselected by %d\n",
1311 host
->host_no
, id
));
1313 if(hostdata
->state
== NCR_700_HOST_BUSY
&& SCp
!= NULL
) {
1314 struct NCR_700_command_slot
*slot
=
1315 (struct NCR_700_command_slot
*)SCp
->host_scribble
;
1316 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
));
1318 switch(dsp
- hostdata
->pScript
) {
1319 case Ent_Disconnect1
:
1320 case Ent_Disconnect2
:
1321 save_for_reselection(hostdata
, SCp
, Ent_Disconnect2
+ hostdata
->pScript
);
1323 case Ent_Disconnect3
:
1324 case Ent_Disconnect4
:
1325 save_for_reselection(hostdata
, SCp
, Ent_Disconnect4
+ hostdata
->pScript
);
1327 case Ent_Disconnect5
:
1328 case Ent_Disconnect6
:
1329 save_for_reselection(hostdata
, SCp
, Ent_Disconnect6
+ hostdata
->pScript
);
1331 case Ent_Disconnect7
:
1332 case Ent_Disconnect8
:
1333 save_for_reselection(hostdata
, SCp
, Ent_Disconnect8
+ hostdata
->pScript
);
1337 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS
, dsp
, SCp
, host
, hostdata
);
1341 slot
->state
= NCR_700_SLOT_QUEUED
;
1345 hostdata
->state
= NCR_700_HOST_BUSY
;
1346 hostdata
->cmd
= NULL
;
1347 /* clear any stale simple tag message */
1348 hostdata
->msgin
[1] = 0;
1349 dma_cache_sync(hostdata
->msgin
, MSG_ARRAY_SIZE
,
1353 /* Selected as target, Ignore */
1354 resume_offset
= hostdata
->pScript
+ Ent_SelectedAsTarget
;
1355 } else if(hostdata
->tag_negotiated
& (1<<id
)) {
1356 resume_offset
= hostdata
->pScript
+ Ent_GetReselectionWithTag
;
1358 resume_offset
= hostdata
->pScript
+ Ent_GetReselectionData
;
1360 return resume_offset
;
1364 NCR_700_clear_fifo(struct Scsi_Host
*host
) {
1365 const struct NCR_700_Host_Parameters
*hostdata
1366 = (struct NCR_700_Host_Parameters
*)host
->hostdata
[0];
1367 if(hostdata
->chip710
) {
1368 NCR_700_writeb(CLR_FIFO_710
, host
, CTEST8_REG
);
1370 NCR_700_writeb(CLR_FIFO
, host
, DFIFO_REG
);
1375 NCR_700_flush_fifo(struct Scsi_Host
*host
) {
1376 const struct NCR_700_Host_Parameters
*hostdata
1377 = (struct NCR_700_Host_Parameters
*)host
->hostdata
[0];
1378 if(hostdata
->chip710
) {
1379 NCR_700_writeb(FLUSH_DMA_FIFO_710
, host
, CTEST8_REG
);
1381 NCR_700_writeb(0, host
, CTEST8_REG
);
1383 NCR_700_writeb(FLUSH_DMA_FIFO
, host
, DFIFO_REG
);
1385 NCR_700_writeb(0, host
, DFIFO_REG
);
1390 /* The queue lock with interrupts disabled must be held on entry to
1393 NCR_700_start_command(struct scsi_cmnd
*SCp
)
1395 struct NCR_700_command_slot
*slot
=
1396 (struct NCR_700_command_slot
*)SCp
->host_scribble
;
1397 struct NCR_700_Host_Parameters
*hostdata
=
1398 (struct NCR_700_Host_Parameters
*)SCp
->device
->host
->hostdata
[0];
1399 __u16 count
= 1; /* for IDENTIFY message */
1401 if(hostdata
->state
!= NCR_700_HOST_FREE
) {
1402 /* keep this inside the lock to close the race window where
1403 * the running command finishes on another CPU while we don't
1404 * change the state to queued on this one */
1405 slot
->state
= NCR_700_SLOT_QUEUED
;
1407 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1408 SCp
->device
->host
->host_no
, slot
->cmnd
, slot
));
1411 hostdata
->state
= NCR_700_HOST_BUSY
;
1412 hostdata
->cmd
= SCp
;
1413 slot
->state
= NCR_700_SLOT_BUSY
;
1414 /* keep interrupts disabled until we have the command correctly
1415 * set up so we cannot take a selection interrupt */
1417 hostdata
->msgout
[0] = NCR_700_identify(SCp
->cmnd
[0] != REQUEST_SENSE
,
1419 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1420 * if the negotiated transfer parameters still hold, so
1421 * always renegotiate them */
1422 if(SCp
->cmnd
[0] == INQUIRY
|| SCp
->cmnd
[0] == REQUEST_SENSE
) {
1423 NCR_700_clear_flag(SCp
->device
, NCR_700_DEV_NEGOTIATED_SYNC
);
1426 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1427 * If a contingent allegiance condition exists, the device
1428 * will refuse all tags, so send the request sense as untagged
1430 if((hostdata
->tag_negotiated
& (1<<scmd_id(SCp
)))
1431 && (slot
->tag
!= SCSI_NO_TAG
&& SCp
->cmnd
[0] != REQUEST_SENSE
)) {
1432 count
+= scsi_populate_tag_msg(SCp
, &hostdata
->msgout
[count
]);
1435 if(hostdata
->fast
&&
1436 NCR_700_is_flag_clear(SCp
->device
, NCR_700_DEV_NEGOTIATED_SYNC
)) {
1437 memcpy(&hostdata
->msgout
[count
], NCR_700_SDTR_msg
,
1438 sizeof(NCR_700_SDTR_msg
));
1439 hostdata
->msgout
[count
+3] = spi_period(SCp
->device
->sdev_target
);
1440 hostdata
->msgout
[count
+4] = spi_offset(SCp
->device
->sdev_target
);
1441 count
+= sizeof(NCR_700_SDTR_msg
);
1442 NCR_700_set_flag(SCp
->device
, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION
);
1445 script_patch_16(hostdata
->script
, MessageCount
, count
);
1448 script_patch_ID(hostdata
->script
,
1449 Device_ID
, 1<<scmd_id(SCp
));
1451 script_patch_32_abs(hostdata
->script
, CommandAddress
,
1453 script_patch_16(hostdata
->script
, CommandCount
, SCp
->cmd_len
);
1454 /* finally plumb the beginning of the SG list into the script
1456 script_patch_32_abs(hostdata
->script
, SGScriptStartAddress
,
1457 to32bit(&slot
->pSG
[0].ins
));
1458 NCR_700_clear_fifo(SCp
->device
->host
);
1460 if(slot
->resume_offset
== 0)
1461 slot
->resume_offset
= hostdata
->pScript
;
1462 /* now perform all the writebacks and invalidates */
1463 dma_cache_sync(hostdata
->msgout
, count
, DMA_TO_DEVICE
);
1464 dma_cache_sync(hostdata
->msgin
, MSG_ARRAY_SIZE
,
1466 dma_cache_sync(SCp
->cmnd
, SCp
->cmd_len
, DMA_TO_DEVICE
);
1467 dma_cache_sync(hostdata
->status
, 1, DMA_FROM_DEVICE
);
1469 /* set the synchronous period/offset */
1470 NCR_700_writeb(NCR_700_get_SXFER(SCp
->device
),
1471 SCp
->device
->host
, SXFER_REG
);
1472 NCR_700_writel(slot
->temp
, SCp
->device
->host
, TEMP_REG
);
1473 NCR_700_writel(slot
->resume_offset
, SCp
->device
->host
, DSP_REG
);
1479 NCR_700_intr(int irq
, void *dev_id
, struct pt_regs
*regs
)
1481 struct Scsi_Host
*host
= (struct Scsi_Host
*)dev_id
;
1482 struct NCR_700_Host_Parameters
*hostdata
=
1483 (struct NCR_700_Host_Parameters
*)host
->hostdata
[0];
1485 __u32 resume_offset
= 0;
1486 __u8 pun
= 0xff, lun
= 0xff;
1487 unsigned long flags
;
1490 /* Use the host lock to serialise acess to the 53c700
1491 * hardware. Note: In future, we may need to take the queue
1492 * lock to enter the done routines. When that happens, we
1493 * need to ensure that for this driver, the host lock and the
1494 * queue lock point to the same thing. */
1495 spin_lock_irqsave(host
->host_lock
, flags
);
1496 if((istat
= NCR_700_readb(host
, ISTAT_REG
))
1497 & (SCSI_INT_PENDING
| DMA_INT_PENDING
)) {
1499 __u8 sstat0
= 0, dstat
= 0;
1501 struct scsi_cmnd
*SCp
= hostdata
->cmd
;
1502 enum NCR_700_Host_State state
;
1505 state
= hostdata
->state
;
1506 SCp
= hostdata
->cmd
;
1508 if(istat
& SCSI_INT_PENDING
) {
1511 sstat0
= NCR_700_readb(host
, SSTAT0_REG
);
1514 if(istat
& DMA_INT_PENDING
) {
1517 dstat
= NCR_700_readb(host
, DSTAT_REG
);
1520 dsps
= NCR_700_readl(host
, DSPS_REG
);
1521 dsp
= NCR_700_readl(host
, DSP_REG
);
1523 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1524 host
->host_no
, istat
, sstat0
, dstat
,
1525 (dsp
- (__u32
)(hostdata
->pScript
))/4,
1529 pun
= SCp
->device
->id
;
1530 lun
= SCp
->device
->lun
;
1533 if(sstat0
& SCSI_RESET_DETECTED
) {
1534 struct scsi_device
*SDp
;
1537 hostdata
->state
= NCR_700_HOST_BUSY
;
1539 printk(KERN_ERR
"scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1540 host
->host_no
, SCp
, SCp
== NULL
? NULL
: SCp
->host_scribble
, dsp
, dsp
- hostdata
->pScript
);
1542 scsi_report_bus_reset(host
, 0);
1544 /* clear all the negotiated parameters */
1545 __shost_for_each_device(SDp
, host
)
1546 SDp
->hostdata
= NULL
;
1548 /* clear all the slots and their pending commands */
1549 for(i
= 0; i
< NCR_700_COMMAND_SLOTS_PER_HOST
; i
++) {
1550 struct scsi_cmnd
*SCp
;
1551 struct NCR_700_command_slot
*slot
=
1552 &hostdata
->slots
[i
];
1554 if(slot
->state
== NCR_700_SLOT_FREE
)
1558 printk(KERN_ERR
" failing command because of reset, slot %p, cmnd %p\n",
1560 free_slot(slot
, hostdata
);
1561 SCp
->host_scribble
= NULL
;
1562 NCR_700_set_depth(SCp
->device
, 0);
1563 /* NOTE: deadlock potential here: we
1564 * rely on mid-layer guarantees that
1565 * scsi_done won't try to issue the
1566 * command again otherwise we'll
1568 * hostdata->state_lock */
1569 SCp
->result
= DID_RESET
<< 16;
1570 SCp
->scsi_done(SCp
);
1573 NCR_700_chip_setup(host
);
1575 hostdata
->state
= NCR_700_HOST_FREE
;
1576 hostdata
->cmd
= NULL
;
1577 /* signal back if this was an eh induced reset */
1578 if(hostdata
->eh_complete
!= NULL
)
1579 complete(hostdata
->eh_complete
);
1581 } else if(sstat0
& SELECTION_TIMEOUT
) {
1582 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1583 host
->host_no
, pun
, lun
));
1584 NCR_700_scsi_done(hostdata
, SCp
, DID_NO_CONNECT
<<16);
1585 } else if(sstat0
& PHASE_MISMATCH
) {
1586 struct NCR_700_command_slot
*slot
= (SCp
== NULL
) ? NULL
:
1587 (struct NCR_700_command_slot
*)SCp
->host_scribble
;
1589 if(dsp
== Ent_SendMessage
+ 8 + hostdata
->pScript
) {
1590 /* It wants to reply to some part of
1592 #ifdef NCR_700_DEBUG
1593 __u32 temp
= NCR_700_readl(host
, TEMP_REG
);
1594 int count
= (hostdata
->script
[Ent_SendMessage
/4] & 0xffffff) - ((NCR_700_readl(host
, DBC_REG
) & 0xffffff) + NCR_700_data_residual(host
));
1595 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
)));
1597 resume_offset
= hostdata
->pScript
+ Ent_SendMessagePhaseMismatch
;
1598 } else if(dsp
>= to32bit(&slot
->pSG
[0].ins
) &&
1599 dsp
<= to32bit(&slot
->pSG
[NCR_700_SG_SEGMENTS
].ins
)) {
1600 int data_transfer
= NCR_700_readl(host
, DBC_REG
) & 0xffffff;
1601 int SGcount
= (dsp
- to32bit(&slot
->pSG
[0].ins
))/sizeof(struct NCR_700_SG_List
);
1602 int residual
= NCR_700_data_residual(host
);
1604 #ifdef NCR_700_DEBUG
1605 __u32 naddr
= NCR_700_readl(host
, DNAD_REG
);
1607 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1608 host
->host_no
, pun
, lun
,
1609 SGcount
, data_transfer
);
1610 scsi_print_command(SCp
);
1612 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1613 host
->host_no
, pun
, lun
,
1614 SGcount
, data_transfer
, residual
);
1617 data_transfer
+= residual
;
1619 if(data_transfer
!= 0) {
1625 count
= (bS_to_cpu(slot
->SG
[SGcount
].ins
) & 0x00ffffff);
1626 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count
, count
-data_transfer
));
1627 slot
->SG
[SGcount
].ins
&= bS_to_host(0xff000000);
1628 slot
->SG
[SGcount
].ins
|= bS_to_host(data_transfer
);
1629 pAddr
= bS_to_cpu(slot
->SG
[SGcount
].pAddr
);
1630 pAddr
+= (count
- data_transfer
);
1631 #ifdef NCR_700_DEBUG
1632 if(pAddr
!= naddr
) {
1633 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
);
1636 slot
->SG
[SGcount
].pAddr
= bS_to_host(pAddr
);
1638 /* set the executed moves to nops */
1639 for(i
=0; i
<SGcount
; i
++) {
1640 slot
->SG
[i
].ins
= bS_to_host(SCRIPT_NOP
);
1641 slot
->SG
[i
].pAddr
= 0;
1643 dma_cache_sync(slot
->SG
, sizeof(slot
->SG
), DMA_TO_DEVICE
);
1644 /* and pretend we disconnected after
1645 * the command phase */
1646 resume_offset
= hostdata
->pScript
+ Ent_MsgInDuringData
;
1647 /* make sure all the data is flushed */
1648 NCR_700_flush_fifo(host
);
1650 __u8 sbcl
= NCR_700_readb(host
, SBCL_REG
);
1651 printk(KERN_ERR
"scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1652 host
->host_no
, pun
, lun
, dsp
- hostdata
->pScript
, sbcl_to_string(sbcl
));
1653 NCR_700_internal_bus_reset(host
);
1656 } else if(sstat0
& SCSI_GROSS_ERROR
) {
1657 printk(KERN_ERR
"scsi%d: (%d:%d) GROSS ERROR\n",
1658 host
->host_no
, pun
, lun
);
1659 NCR_700_scsi_done(hostdata
, SCp
, DID_ERROR
<<16);
1660 } else if(sstat0
& PARITY_ERROR
) {
1661 printk(KERN_ERR
"scsi%d: (%d:%d) PARITY ERROR\n",
1662 host
->host_no
, pun
, lun
);
1663 NCR_700_scsi_done(hostdata
, SCp
, DID_ERROR
<<16);
1664 } else if(dstat
& SCRIPT_INT_RECEIVED
) {
1665 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1666 host
->host_no
, pun
, lun
));
1667 resume_offset
= process_script_interrupt(dsps
, dsp
, SCp
, host
, hostdata
);
1668 } else if(dstat
& (ILGL_INST_DETECTED
)) {
1669 printk(KERN_ERR
"scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1670 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1671 host
->host_no
, pun
, lun
,
1672 dsp
, dsp
- hostdata
->pScript
);
1673 NCR_700_scsi_done(hostdata
, SCp
, DID_ERROR
<<16);
1674 } else if(dstat
& (WATCH_DOG_INTERRUPT
|ABORTED
)) {
1675 printk(KERN_ERR
"scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1676 host
->host_no
, pun
, lun
, dstat
);
1677 NCR_700_scsi_done(hostdata
, SCp
, DID_ERROR
<<16);
1681 /* NOTE: selection interrupt processing MUST occur
1682 * after script interrupt processing to correctly cope
1683 * with the case where we process a disconnect and
1684 * then get reselected before we process the
1686 if(sstat0
& SELECTED
) {
1687 /* FIXME: It currently takes at least FOUR
1688 * interrupts to complete a command that
1689 * disconnects: one for the disconnect, one
1690 * for the reselection, one to get the
1691 * reselection data and one to complete the
1692 * command. If we guess the reselected
1693 * command here and prepare it, we only need
1694 * to get a reselection data interrupt if we
1695 * guessed wrongly. Since the interrupt
1696 * overhead is much greater than the command
1697 * setup, this would be an efficient
1698 * optimisation particularly as we probably
1699 * only have one outstanding command on a
1700 * target most of the time */
1702 resume_offset
= process_selection(host
, dsp
);
1709 if(hostdata
->state
!= NCR_700_HOST_BUSY
) {
1710 printk(KERN_ERR
"scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1711 host
->host_no
, resume_offset
, resume_offset
- hostdata
->pScript
);
1712 hostdata
->state
= NCR_700_HOST_BUSY
;
1715 DEBUG(("Attempting to resume at %x\n", resume_offset
));
1716 NCR_700_clear_fifo(host
);
1717 NCR_700_writel(resume_offset
, host
, DSP_REG
);
1719 /* There is probably a technical no-no about this: If we're a
1720 * shared interrupt and we got this interrupt because the
1721 * other device needs servicing not us, we're still going to
1722 * check our queued commands here---of course, there shouldn't
1723 * be any outstanding.... */
1724 if(hostdata
->state
== NCR_700_HOST_FREE
) {
1727 for(i
= 0; i
< NCR_700_COMMAND_SLOTS_PER_HOST
; i
++) {
1728 /* fairness: always run the queue from the last
1729 * position we left off */
1730 int j
= (i
+ hostdata
->saved_slot_position
)
1731 % NCR_700_COMMAND_SLOTS_PER_HOST
;
1733 if(hostdata
->slots
[j
].state
!= NCR_700_SLOT_QUEUED
)
1735 if(NCR_700_start_command(hostdata
->slots
[j
].cmnd
)) {
1736 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1737 host
->host_no
, &hostdata
->slots
[j
],
1738 hostdata
->slots
[j
].cmnd
));
1739 hostdata
->saved_slot_position
= j
+ 1;
1746 spin_unlock_irqrestore(host
->host_lock
, flags
);
1747 return IRQ_RETVAL(handled
);
1751 NCR_700_queuecommand(struct scsi_cmnd
*SCp
, void (*done
)(struct scsi_cmnd
*))
1753 struct NCR_700_Host_Parameters
*hostdata
=
1754 (struct NCR_700_Host_Parameters
*)SCp
->device
->host
->hostdata
[0];
1756 enum dma_data_direction direction
;
1757 struct NCR_700_command_slot
*slot
;
1759 if(hostdata
->command_slot_count
>= NCR_700_COMMAND_SLOTS_PER_HOST
) {
1760 /* We're over our allocation, this should never happen
1761 * since we report the max allocation to the mid layer */
1762 printk(KERN_WARNING
"scsi%d: Command depth has gone over queue depth\n", SCp
->device
->host
->host_no
);
1765 /* check for untagged commands. We cannot have any outstanding
1766 * commands if we accept them. Commands could be untagged because:
1768 * - The tag negotiated bitmap is clear
1769 * - The blk layer sent and untagged command
1771 if(NCR_700_get_depth(SCp
->device
) != 0
1772 && (!(hostdata
->tag_negotiated
& (1<<scmd_id(SCp
)))
1773 || !blk_rq_tagged(SCp
->request
))) {
1774 CDEBUG(KERN_ERR
, SCp
, "has non zero depth %d\n",
1775 NCR_700_get_depth(SCp
->device
));
1776 return SCSI_MLQUEUE_DEVICE_BUSY
;
1778 if(NCR_700_get_depth(SCp
->device
) >= SCp
->device
->queue_depth
) {
1779 CDEBUG(KERN_ERR
, SCp
, "has max tag depth %d\n",
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<<scmd_id(SCp
))) == 0
1803 && NCR_700_get_tag_neg_state(SCp
->device
) == NCR_700_START_TAG_NEGOTIATION
) {
1804 scmd_printk(KERN_ERR
, SCp
, "Enabling Tag Command Queuing\n");
1805 hostdata
->tag_negotiated
|= (1<<scmd_id(SCp
));
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<<scmd_id(SCp
)))) {
1817 scmd_printk(KERN_INFO
, SCp
, "Disabling Tag Command Queuing\n");
1818 hostdata
->tag_negotiated
&= ~(1<<scmd_id(SCp
));
1821 if((hostdata
->tag_negotiated
&(1<<scmd_id(SCp
)))
1822 && scsi_get_tag_type(SCp
->device
)) {
1823 slot
->tag
= SCp
->request
->tag
;
1824 CDEBUG(KERN_DEBUG
, SCp
, "sending out tag %d, slot %p\n",
1827 slot
->tag
= SCSI_NO_TAG
;
1828 /* must populate current_cmnd for scsi_find_tag to work */
1829 SCp
->device
->current_cmnd
= SCp
;
1831 /* sanity check: some of the commands generated by the mid-layer
1832 * have an eccentric idea of their sc_data_direction */
1833 if(!SCp
->use_sg
&& !SCp
->request_bufflen
1834 && SCp
->sc_data_direction
!= DMA_NONE
) {
1835 #ifdef NCR_700_DEBUG
1836 printk("53c700: Command");
1837 scsi_print_command(SCp
);
1838 printk("Has wrong data direction %d\n", SCp
->sc_data_direction
);
1840 SCp
->sc_data_direction
= DMA_NONE
;
1843 switch (SCp
->cmnd
[0]) {
1845 /* clear the internal sense magic */
1849 /* OK, get it from the command */
1850 switch(SCp
->sc_data_direction
) {
1851 case DMA_BIDIRECTIONAL
:
1853 printk(KERN_ERR
"53c700: Unknown command for data direction ");
1854 scsi_print_command(SCp
);
1861 case DMA_FROM_DEVICE
:
1862 move_ins
= SCRIPT_MOVE_DATA_IN
;
1865 move_ins
= SCRIPT_MOVE_DATA_OUT
;
1870 /* now build the scatter gather list */
1871 direction
= SCp
->sc_data_direction
;
1875 dma_addr_t vPtr
= 0;
1879 sg_count
= dma_map_sg(hostdata
->dev
, SCp
->buffer
,
1880 SCp
->use_sg
, direction
);
1882 vPtr
= dma_map_single(hostdata
->dev
,
1883 SCp
->request_buffer
,
1884 SCp
->request_bufflen
,
1886 count
= SCp
->request_bufflen
;
1887 slot
->dma_handle
= vPtr
;
1892 for(i
= 0; i
< sg_count
; i
++) {
1895 struct scatterlist
*sg
= SCp
->buffer
;
1897 vPtr
= sg_dma_address(&sg
[i
]);
1898 count
= sg_dma_len(&sg
[i
]);
1901 slot
->SG
[i
].ins
= bS_to_host(move_ins
| count
);
1902 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1903 i
, count
, slot
->SG
[i
].ins
, (unsigned long)vPtr
));
1904 slot
->SG
[i
].pAddr
= bS_to_host(vPtr
);
1906 slot
->SG
[i
].ins
= bS_to_host(SCRIPT_RETURN
);
1907 slot
->SG
[i
].pAddr
= 0;
1908 dma_cache_sync(slot
->SG
, sizeof(slot
->SG
), DMA_TO_DEVICE
);
1909 DEBUG((" SETTING %08lx to %x\n",
1910 (&slot
->pSG
[i
].ins
),
1913 slot
->resume_offset
= 0;
1914 slot
->pCmd
= dma_map_single(hostdata
->dev
, SCp
->cmnd
,
1915 sizeof(SCp
->cmnd
), DMA_TO_DEVICE
);
1916 NCR_700_start_command(SCp
);
1921 NCR_700_abort(struct scsi_cmnd
* SCp
)
1923 struct NCR_700_command_slot
*slot
;
1925 scmd_printk(KERN_INFO
, SCp
,
1926 "New error handler wants to abort command\n\t");
1927 scsi_print_command(SCp
);
1929 slot
= (struct NCR_700_command_slot
*)SCp
->host_scribble
;
1932 /* no outstanding command to abort */
1934 if(SCp
->cmnd
[0] == TEST_UNIT_READY
) {
1935 /* FIXME: This is because of a problem in the new
1936 * error handler. When it is in error recovery, it
1937 * will send a TUR to a device it thinks may still be
1938 * showing a problem. If the TUR isn't responded to,
1939 * it will abort it and mark the device off line.
1940 * Unfortunately, it does no other error recovery, so
1941 * this would leave us with an outstanding command
1942 * occupying a slot. Rather than allow this to
1943 * happen, we issue a bus reset to force all
1944 * outstanding commands to terminate here. */
1945 NCR_700_internal_bus_reset(SCp
->device
->host
);
1946 /* still drop through and return failed */
1953 NCR_700_bus_reset(struct scsi_cmnd
* SCp
)
1955 DECLARE_COMPLETION(complete
);
1956 struct NCR_700_Host_Parameters
*hostdata
=
1957 (struct NCR_700_Host_Parameters
*)SCp
->device
->host
->hostdata
[0];
1959 scmd_printk(KERN_INFO
, SCp
,
1960 "New error handler wants BUS reset, cmd %p\n\t", SCp
);
1961 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 spin_lock_irq(SCp
->device
->host
->host_lock
);
1967 while (hostdata
->eh_complete
!= NULL
) {
1968 spin_unlock_irq(SCp
->device
->host
->host_lock
);
1969 msleep_interruptible(100);
1970 spin_lock_irq(SCp
->device
->host
->host_lock
);
1973 hostdata
->eh_complete
= &complete
;
1974 NCR_700_internal_bus_reset(SCp
->device
->host
);
1976 spin_unlock_irq(SCp
->device
->host
->host_lock
);
1977 wait_for_completion(&complete
);
1978 spin_lock_irq(SCp
->device
->host
->host_lock
);
1980 hostdata
->eh_complete
= NULL
;
1981 /* Revalidate the transport parameters of the failing device */
1983 spi_schedule_dv_device(SCp
->device
);
1985 spin_unlock_irq(SCp
->device
->host
->host_lock
);
1990 NCR_700_host_reset(struct scsi_cmnd
* SCp
)
1992 scmd_printk(KERN_INFO
, SCp
, "New error handler wants HOST reset\n\t");
1993 scsi_print_command(SCp
);
1995 spin_lock_irq(SCp
->device
->host
->host_lock
);
1997 NCR_700_internal_bus_reset(SCp
->device
->host
);
1998 NCR_700_chip_reset(SCp
->device
->host
);
2000 spin_unlock_irq(SCp
->device
->host
->host_lock
);
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 << sdev_id(SDp
));
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
, struct device_attribute
*attr
, 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
);