[SCSI] drivers/scsi: Use ARRAY_SIZE macro
[linux-2.6.git] / drivers / scsi / 53c700.c
1 /* -*- mode: c; c-basic-offset: 8 -*- */
2
3 /* NCR (or Symbios) 53c700 and 53c700-66 Driver
4  *
5  * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
6 **-----------------------------------------------------------------------------
7 **  
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.
12 **
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.
17 **
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.
21 **
22 **-----------------------------------------------------------------------------
23  */
24
25 /* Notes:
26  *
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).
31  *
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.
34  * 
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).
42  *
43  *
44  * TODO List:
45  *
46  * 1. Better statistics in the proc fs
47  *
48  * 2. Implement message queue (queues SCSI messages like commands) and make
49  *    the abort and device reset functions use them.
50  * */
51
52 /* CHANGELOG
53  *
54  * Version 2.8
55  *
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).
61  *
62  * Version 2.7
63  *
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).
69  *
70  * Version 2.6
71  *
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.
75  *
76  * Version 2.5
77  * 
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.
83  *
84  * Version 2.4
85  *
86  * Added support for the 53c710 chip (in 53c700 emulation mode only---no 
87  * special 53c710 instructions or registers are used).
88  *
89  * Version 2.3
90  *
91  * More endianness/cache coherency changes.
92  *
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)
96  *
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.
100  *
101  * Thanks also go to Linuxcare Inc. for providing several PARISC
102  * machines for me to debug the driver on.
103  *
104  * Version 2.2
105  *
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.
109  *
110  * Version 2.1
111  *
112  * Initial modularisation from the D700.  See NCR_D700.c for the rest of
113  * the changelog.
114  * */
115 #define NCR_700_VERSION "2.8"
116
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>
132 #include <asm/dma.h>
133 #include <asm/system.h>
134 #include <asm/io.h>
135 #include <asm/pgtable.h>
136 #include <asm/byteorder.h>
137
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>
146
147 #include "53c700.h"
148
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
154  * complaining */
155 #define to32bit(x)      ((__u32)((unsigned long)(x)))
156
157 #ifdef NCR_700_DEBUG
158 #define STATIC
159 #else
160 #define STATIC static
161 #endif
162
163 MODULE_AUTHOR("James Bottomley");
164 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
165 MODULE_LICENSE("GPL");
166
167 /* This is the script */
168 #include "53c700_d.h"
169
170
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);
181
182 STATIC struct device_attribute *NCR_700_dev_attrs[];
183
184 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
185
186 static char *NCR_700_phase[] = {
187         "",
188         "after selection",
189         "before command phase",
190         "after command phase",
191         "after status phase",
192         "after data in phase",
193         "after data out phase",
194         "during data phase",
195 };
196
197 static char *NCR_700_condition[] = {
198         "",
199         "NOT MSG_OUT",
200         "UNEXPECTED PHASE",
201         "NOT MSG_IN",
202         "UNEXPECTED MSG",
203         "MSG_IN",
204         "SDTR_MSG RECEIVED",
205         "REJECT_MSG RECEIVED",
206         "DISCONNECT_MSG RECEIVED",
207         "MSG_OUT",
208         "DATA_IN",
209         
210 };
211
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",
217 };
218
219 static char *NCR_700_SBCL_bits[] = {
220         "IO ",
221         "CD ",
222         "MSG ",
223         "ATN ",
224         "SEL ",
225         "BSY ",
226         "ACK ",
227         "REQ ",
228 };
229
230 static char *NCR_700_SBCL_to_phase[] = {
231         "DATA_OUT",
232         "DATA_IN",
233         "CMD_OUT",
234         "STATE",
235         "ILLEGAL PHASE",
236         "ILLEGAL PHASE",
237         "MSG OUT",
238         "MSG IN",
239 };
240
241 /* This translates the SDTR message offset and period to a value
242  * which can be loaded into the SXFER_REG.
243  *
244  * NOTE: According to SCSI-2, the true transfer period (in ns) is
245  *       actually four times this period value */
246 static inline __u8
247 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
248                                __u8 offset, __u8 period)
249 {
250         int XFERP;
251
252         __u8 min_xferp = (hostdata->chip710
253                           ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
254         __u8 max_offset = (hostdata->chip710
255                            ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
256
257         if(offset == 0)
258                 return 0;
259
260         if(period < hostdata->min_period) {
261                 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
262                 period = hostdata->min_period;
263         }
264         XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
265         if(offset > max_offset) {
266                 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
267                        offset, max_offset);
268                 offset = max_offset;
269         }
270         if(XFERP < min_xferp) {
271                 printk(KERN_WARNING "53c700: XFERP %d is less than minium, setting to %d\n",
272                        XFERP,  min_xferp);
273                 XFERP =  min_xferp;
274         }
275         return (offset & 0x0f) | (XFERP & 0x07)<<4;
276 }
277
278 static inline __u8
279 NCR_700_get_SXFER(struct scsi_device *SDp)
280 {
281         struct NCR_700_Host_Parameters *hostdata = 
282                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
283
284         return NCR_700_offset_period_to_sxfer(hostdata,
285                                               spi_offset(SDp->sdev_target),
286                                               spi_period(SDp->sdev_target));
287 }
288
289 struct Scsi_Host *
290 NCR_700_detect(struct scsi_host_template *tpnt,
291                struct NCR_700_Host_Parameters *hostdata, struct device *dev)
292 {
293         dma_addr_t pScript, pSlots;
294         __u8 *memory;
295         __u32 *script;
296         struct Scsi_Host *host;
297         static int banner = 0;
298         int j;
299
300         if(tpnt->sdev_attrs == NULL)
301                 tpnt->sdev_attrs = NCR_700_dev_attrs;
302
303         memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
304                                        &pScript, GFP_KERNEL);
305         if(memory == NULL) {
306                 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
307                 return NULL;
308         }
309
310         script = (__u32 *)memory;
311         hostdata->msgin = memory + MSGIN_OFFSET;
312         hostdata->msgout = memory + MSGOUT_OFFSET;
313         hostdata->status = memory + STATUS_OFFSET;
314         /* all of these offsets are L1_CACHE_BYTES separated.  It is fatal
315          * if this isn't sufficient separation to avoid dma flushing issues */
316         BUG_ON(!dma_is_consistent(pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());
317         hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
318         hostdata->dev = dev;
319
320         pSlots = pScript + SLOTS_OFFSET;
321
322         /* Fill in the missing routines from the host template */
323         tpnt->queuecommand = NCR_700_queuecommand;
324         tpnt->eh_abort_handler = NCR_700_abort;
325         tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
326         tpnt->eh_host_reset_handler = NCR_700_host_reset;
327         tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
328         tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
329         tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
330         tpnt->use_clustering = ENABLE_CLUSTERING;
331         tpnt->slave_configure = NCR_700_slave_configure;
332         tpnt->slave_destroy = NCR_700_slave_destroy;
333         tpnt->change_queue_depth = NCR_700_change_queue_depth;
334         tpnt->change_queue_type = NCR_700_change_queue_type;
335
336         if(tpnt->name == NULL)
337                 tpnt->name = "53c700";
338         if(tpnt->proc_name == NULL)
339                 tpnt->proc_name = "53c700";
340
341         host = scsi_host_alloc(tpnt, 4);
342         if (!host)
343                 return NULL;
344         memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
345                * NCR_700_COMMAND_SLOTS_PER_HOST);
346         for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
347                 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
348                                           - (unsigned long)&hostdata->slots[0].SG[0]);
349                 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
350                 if(j == 0)
351                         hostdata->free_list = &hostdata->slots[j];
352                 else
353                         hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
354                 hostdata->slots[j].state = NCR_700_SLOT_FREE;
355         }
356
357         for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
358                 script[j] = bS_to_host(SCRIPT[j]);
359
360         /* adjust all labels to be bus physical */
361         for (j = 0; j < PATCHES; j++)
362                 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
363         /* now patch up fixed addresses. */
364         script_patch_32(script, MessageLocation,
365                         pScript + MSGOUT_OFFSET);
366         script_patch_32(script, StatusAddress,
367                         pScript + STATUS_OFFSET);
368         script_patch_32(script, ReceiveMsgAddress,
369                         pScript + MSGIN_OFFSET);
370
371         hostdata->script = script;
372         hostdata->pScript = pScript;
373         dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
374         hostdata->state = NCR_700_HOST_FREE;
375         hostdata->cmd = NULL;
376         host->max_id = 8;
377         host->max_lun = NCR_700_MAX_LUNS;
378         BUG_ON(NCR_700_transport_template == NULL);
379         host->transportt = NCR_700_transport_template;
380         host->unique_id = (unsigned long)hostdata->base;
381         hostdata->eh_complete = NULL;
382         host->hostdata[0] = (unsigned long)hostdata;
383         /* kick the chip */
384         NCR_700_writeb(0xff, host, CTEST9_REG);
385         if (hostdata->chip710)
386                 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
387         else
388                 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
389         hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
390         if (banner == 0) {
391                 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
392                 banner = 1;
393         }
394         printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
395                hostdata->chip710 ? "53c710" :
396                (hostdata->fast ? "53c700-66" : "53c700"),
397                hostdata->rev, hostdata->differential ?
398                "(Differential)" : "");
399         /* reset the chip */
400         NCR_700_chip_reset(host);
401
402         if (scsi_add_host(host, dev)) {
403                 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
404                 scsi_host_put(host);
405                 return NULL;
406         }
407
408         spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
409                 SPI_SIGNAL_SE;
410
411         return host;
412 }
413
414 int
415 NCR_700_release(struct Scsi_Host *host)
416 {
417         struct NCR_700_Host_Parameters *hostdata = 
418                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
419
420         dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
421                                hostdata->script, hostdata->pScript);
422         return 1;
423 }
424
425 static inline __u8
426 NCR_700_identify(int can_disconnect, __u8 lun)
427 {
428         return IDENTIFY_BASE |
429                 ((can_disconnect) ? 0x40 : 0) |
430                 (lun & NCR_700_LUN_MASK);
431 }
432
433 /*
434  * Function : static int data_residual (Scsi_Host *host)
435  *
436  * Purpose : return residual data count of what's in the chip.  If you
437  * really want to know what this function is doing, it's almost a
438  * direct transcription of the algorithm described in the 53c710
439  * guide, except that the DBC and DFIFO registers are only 6 bits
440  * wide on a 53c700.
441  *
442  * Inputs : host - SCSI host */
443 static inline int
444 NCR_700_data_residual (struct Scsi_Host *host) {
445         struct NCR_700_Host_Parameters *hostdata = 
446                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
447         int count, synchronous = 0;
448         unsigned int ddir;
449
450         if(hostdata->chip710) {
451                 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
452                          (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
453         } else {
454                 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
455                          (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
456         }
457         
458         if(hostdata->fast)
459                 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
460         
461         /* get the data direction */
462         ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
463
464         if (ddir) {
465                 /* Receive */
466                 if (synchronous) 
467                         count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
468                 else
469                         if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
470                                 ++count;
471         } else {
472                 /* Send */
473                 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
474                 if (sstat & SODL_REG_FULL)
475                         ++count;
476                 if (synchronous && (sstat & SODR_REG_FULL))
477                         ++count;
478         }
479 #ifdef NCR_700_DEBUG
480         if(count)
481                 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
482 #endif
483         return count;
484 }
485
486 /* print out the SCSI wires and corresponding phase from the SBCL register
487  * in the chip */
488 static inline char *
489 sbcl_to_string(__u8 sbcl)
490 {
491         int i;
492         static char ret[256];
493
494         ret[0]='\0';
495         for(i=0; i<8; i++) {
496                 if((1<<i) & sbcl) 
497                         strcat(ret, NCR_700_SBCL_bits[i]);
498         }
499         strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
500         return ret;
501 }
502
503 static inline __u8
504 bitmap_to_number(__u8 bitmap)
505 {
506         __u8 i;
507
508         for(i=0; i<8 && !(bitmap &(1<<i)); i++)
509                 ;
510         return i;
511 }
512
513 /* Pull a slot off the free list */
514 STATIC struct NCR_700_command_slot *
515 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
516 {
517         struct NCR_700_command_slot *slot = hostdata->free_list;
518
519         if(slot == NULL) {
520                 /* sanity check */
521                 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
522                         printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
523                 return NULL;
524         }
525
526         if(slot->state != NCR_700_SLOT_FREE)
527                 /* should panic! */
528                 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
529                 
530
531         hostdata->free_list = slot->ITL_forw;
532         slot->ITL_forw = NULL;
533
534
535         /* NOTE: set the state to busy here, not queued, since this
536          * indicates the slot is in use and cannot be run by the IRQ
537          * finish routine.  If we cannot queue the command when it
538          * is properly build, we then change to NCR_700_SLOT_QUEUED */
539         slot->state = NCR_700_SLOT_BUSY;
540         hostdata->command_slot_count++;
541         
542         return slot;
543 }
544
545 STATIC void 
546 free_slot(struct NCR_700_command_slot *slot,
547           struct NCR_700_Host_Parameters *hostdata)
548 {
549         if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
550                 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
551         }
552         if(slot->state == NCR_700_SLOT_FREE) {
553                 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
554         }
555         
556         slot->resume_offset = 0;
557         slot->cmnd = NULL;
558         slot->state = NCR_700_SLOT_FREE;
559         slot->ITL_forw = hostdata->free_list;
560         hostdata->free_list = slot;
561         hostdata->command_slot_count--;
562 }
563
564
565 /* This routine really does very little.  The command is indexed on
566    the ITL and (if tagged) the ITLQ lists in _queuecommand */
567 STATIC void
568 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
569                      struct scsi_cmnd *SCp, __u32 dsp)
570 {
571         /* Its just possible that this gets executed twice */
572         if(SCp != NULL) {
573                 struct NCR_700_command_slot *slot =
574                         (struct NCR_700_command_slot *)SCp->host_scribble;
575
576                 slot->resume_offset = dsp;
577         }
578         hostdata->state = NCR_700_HOST_FREE;
579         hostdata->cmd = NULL;
580 }
581
582 STATIC inline void
583 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
584               struct NCR_700_command_slot *slot)
585 {
586         if(SCp->sc_data_direction != DMA_NONE &&
587            SCp->sc_data_direction != DMA_BIDIRECTIONAL) {
588                 if(SCp->use_sg) {
589                         dma_unmap_sg(hostdata->dev, SCp->buffer,
590                                      SCp->use_sg, SCp->sc_data_direction);
591                 } else {
592                         dma_unmap_single(hostdata->dev, slot->dma_handle,
593                                          SCp->request_bufflen,
594                                          SCp->sc_data_direction);
595                 }
596         }
597 }
598
599 STATIC inline void
600 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
601                struct scsi_cmnd *SCp, int result)
602 {
603         hostdata->state = NCR_700_HOST_FREE;
604         hostdata->cmd = NULL;
605
606         if(SCp != NULL) {
607                 struct NCR_700_command_slot *slot = 
608                         (struct NCR_700_command_slot *)SCp->host_scribble;
609                 
610                 NCR_700_unmap(hostdata, SCp, slot);
611                 dma_unmap_single(hostdata->dev, slot->pCmd,
612                                  sizeof(SCp->cmnd), DMA_TO_DEVICE);
613                 if(SCp->cmnd[0] == REQUEST_SENSE && SCp->cmnd[6] == NCR_700_INTERNAL_SENSE_MAGIC) {
614 #ifdef NCR_700_DEBUG
615                         printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
616                                SCp, SCp->cmnd[7], result);
617                         scsi_print_sense("53c700", SCp);
618
619 #endif
620                         /* restore the old result if the request sense was
621                          * successful */
622                         if(result == 0)
623                                 result = SCp->cmnd[7];
624                         /* now restore the original command */
625                         memcpy((void *) SCp->cmnd, (void *) SCp->data_cmnd,
626                                sizeof(SCp->data_cmnd));
627                         SCp->request_buffer = SCp->buffer;
628                         SCp->request_bufflen = SCp->bufflen;
629                         SCp->use_sg = SCp->old_use_sg;
630                         SCp->cmd_len = SCp->old_cmd_len;
631                         SCp->sc_data_direction = SCp->sc_old_data_direction;
632                         SCp->underflow = SCp->old_underflow;
633                         
634                 }
635                 free_slot(slot, hostdata);
636 #ifdef NCR_700_DEBUG
637                 if(NCR_700_get_depth(SCp->device) == 0 ||
638                    NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
639                         printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
640                                NCR_700_get_depth(SCp->device));
641 #endif /* NCR_700_DEBUG */
642                 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
643
644                 SCp->host_scribble = NULL;
645                 SCp->result = result;
646                 SCp->scsi_done(SCp);
647         } else {
648                 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
649         }
650 }
651
652
653 STATIC void
654 NCR_700_internal_bus_reset(struct Scsi_Host *host)
655 {
656         /* Bus reset */
657         NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
658         udelay(50);
659         NCR_700_writeb(0, host, SCNTL1_REG);
660
661 }
662
663 STATIC void
664 NCR_700_chip_setup(struct Scsi_Host *host)
665 {
666         struct NCR_700_Host_Parameters *hostdata = 
667                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
668         __u32 dcntl_extra = 0;
669         __u8 min_period;
670         __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
671
672         if(hostdata->chip710) {
673                 __u8 burst_disable = hostdata->burst_disable
674                         ? BURST_DISABLE : 0;
675                 dcntl_extra = COMPAT_700_MODE;
676
677                 NCR_700_writeb(dcntl_extra, host, DCNTL_REG);
678                 NCR_700_writeb(BURST_LENGTH_8  | hostdata->dmode_extra,
679                                host, DMODE_710_REG);
680                 NCR_700_writeb(burst_disable | (hostdata->differential ? 
681                                                 DIFF : 0), host, CTEST7_REG);
682                 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
683                 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
684                                | AUTO_ATN, host, SCNTL0_REG);
685         } else {
686                 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
687                                host, DMODE_700_REG);
688                 NCR_700_writeb(hostdata->differential ? 
689                                DIFF : 0, host, CTEST7_REG);
690                 if(hostdata->fast) {
691                         /* this is for 700-66, does nothing on 700 */
692                         NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION 
693                                        | GENERATE_RECEIVE_PARITY, host,
694                                        CTEST8_REG);
695                 } else {
696                         NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
697                                        | PARITY | AUTO_ATN, host, SCNTL0_REG);
698                 }
699         }
700
701         NCR_700_writeb(1 << host->this_id, host, SCID_REG);
702         NCR_700_writeb(0, host, SBCL_REG);
703         NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
704
705         NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
706              | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
707
708         NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
709         NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
710         if(hostdata->clock > 75) {
711                 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
712                 /* do the best we can, but the async clock will be out
713                  * of spec: sync divider 2, async divider 3 */
714                 DEBUG(("53c700: sync 2 async 3\n"));
715                 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
716                 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
717                 hostdata->sync_clock = hostdata->clock/2;
718         } else  if(hostdata->clock > 50  && hostdata->clock <= 75) {
719                 /* sync divider 1.5, async divider 3 */
720                 DEBUG(("53c700: sync 1.5 async 3\n"));
721                 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
722                 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
723                 hostdata->sync_clock = hostdata->clock*2;
724                 hostdata->sync_clock /= 3;
725                 
726         } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
727                 /* sync divider 1, async divider 2 */
728                 DEBUG(("53c700: sync 1 async 2\n"));
729                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
730                 NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG);
731                 hostdata->sync_clock = hostdata->clock;
732         } else if(hostdata->clock > 25 && hostdata->clock <=37) {
733                 /* sync divider 1, async divider 1.5 */
734                 DEBUG(("53c700: sync 1 async 1.5\n"));
735                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
736                 NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG);
737                 hostdata->sync_clock = hostdata->clock;
738         } else {
739                 DEBUG(("53c700: sync 1 async 1\n"));
740                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
741                 NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG);
742                 /* sync divider 1, async divider 1 */
743                 hostdata->sync_clock = hostdata->clock;
744         }
745         /* Calculate the actual minimum period that can be supported
746          * by our synchronous clock speed.  See the 710 manual for
747          * exact details of this calculation which is based on a
748          * setting of the SXFER register */
749         min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
750         hostdata->min_period = NCR_700_MIN_PERIOD;
751         if(min_period > NCR_700_MIN_PERIOD)
752                 hostdata->min_period = min_period;
753 }
754
755 STATIC void
756 NCR_700_chip_reset(struct Scsi_Host *host)
757 {
758         struct NCR_700_Host_Parameters *hostdata = 
759                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
760         if(hostdata->chip710) {
761                 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
762                 udelay(100);
763
764                 NCR_700_writeb(0, host, ISTAT_REG);
765         } else {
766                 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
767                 udelay(100);
768                 
769                 NCR_700_writeb(0, host, DCNTL_REG);
770         }
771
772         mdelay(1000);
773
774         NCR_700_chip_setup(host);
775 }
776
777 /* The heart of the message processing engine is that the instruction
778  * immediately after the INT is the normal case (and so must be CLEAR
779  * ACK).  If we want to do something else, we call that routine in
780  * scripts and set temp to be the normal case + 8 (skipping the CLEAR
781  * ACK) so that the routine returns correctly to resume its activity
782  * */
783 STATIC __u32
784 process_extended_message(struct Scsi_Host *host, 
785                          struct NCR_700_Host_Parameters *hostdata,
786                          struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
787 {
788         __u32 resume_offset = dsp, temp = dsp + 8;
789         __u8 pun = 0xff, lun = 0xff;
790
791         if(SCp != NULL) {
792                 pun = SCp->device->id;
793                 lun = SCp->device->lun;
794         }
795
796         switch(hostdata->msgin[2]) {
797         case A_SDTR_MSG:
798                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
799                         struct scsi_target *starget = SCp->device->sdev_target;
800                         __u8 period = hostdata->msgin[3];
801                         __u8 offset = hostdata->msgin[4];
802
803                         if(offset == 0 || period == 0) {
804                                 offset = 0;
805                                 period = 0;
806                         }
807
808                         spi_offset(starget) = offset;
809                         spi_period(starget) = period;
810                         
811                         if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
812                                 spi_display_xfer_agreement(starget);
813                                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
814                         }
815                         
816                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
817                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
818                         
819                         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
820                                        host, SXFER_REG);
821
822                 } else {
823                         /* SDTR message out of the blue, reject it */
824                         shost_printk(KERN_WARNING, host,
825                                 "Unexpected SDTR msg\n");
826                         hostdata->msgout[0] = A_REJECT_MSG;
827                         dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
828                         script_patch_16(hostdata->script, MessageCount, 1);
829                         /* SendMsgOut returns, so set up the return
830                          * address */
831                         resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
832                 }
833                 break;
834         
835         case A_WDTR_MSG:
836                 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
837                        host->host_no, pun, lun);
838                 hostdata->msgout[0] = A_REJECT_MSG;
839                 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
840                 script_patch_16(hostdata->script, MessageCount, 1);
841                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
842
843                 break;
844
845         default:
846                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
847                        host->host_no, pun, lun,
848                        NCR_700_phase[(dsps & 0xf00) >> 8]);
849                 spi_print_msg(hostdata->msgin);
850                 printk("\n");
851                 /* just reject it */
852                 hostdata->msgout[0] = A_REJECT_MSG;
853                 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
854                 script_patch_16(hostdata->script, MessageCount, 1);
855                 /* SendMsgOut returns, so set up the return
856                  * address */
857                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
858         }
859         NCR_700_writel(temp, host, TEMP_REG);
860         return resume_offset;
861 }
862
863 STATIC __u32
864 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
865                 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
866 {
867         /* work out where to return to */
868         __u32 temp = dsp + 8, resume_offset = dsp;
869         __u8 pun = 0xff, lun = 0xff;
870
871         if(SCp != NULL) {
872                 pun = SCp->device->id;
873                 lun = SCp->device->lun;
874         }
875
876 #ifdef NCR_700_DEBUG
877         printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
878                NCR_700_phase[(dsps & 0xf00) >> 8]);
879         spi_print_msg(hostdata->msgin);
880         printk("\n");
881 #endif
882
883         switch(hostdata->msgin[0]) {
884
885         case A_EXTENDED_MSG:
886                 resume_offset =  process_extended_message(host, hostdata, SCp,
887                                                           dsp, dsps);
888                 break;
889
890         case A_REJECT_MSG:
891                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
892                         /* Rejected our sync negotiation attempt */
893                         spi_period(SCp->device->sdev_target) =
894                                 spi_offset(SCp->device->sdev_target) = 0;
895                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
896                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
897                 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
898                         /* rejected our first simple tag message */
899                         scmd_printk(KERN_WARNING, SCp,
900                                 "Rejected first tag queue attempt, turning off tag queueing\n");
901                         /* we're done negotiating */
902                         NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
903                         hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
904                         SCp->device->tagged_supported = 0;
905                         scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
906                 } else {
907                         shost_printk(KERN_WARNING, host,
908                                 "(%d:%d) Unexpected REJECT Message %s\n",
909                                pun, lun,
910                                NCR_700_phase[(dsps & 0xf00) >> 8]);
911                         /* however, just ignore it */
912                 }
913                 break;
914
915         case A_PARITY_ERROR_MSG:
916                 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
917                        pun, lun);
918                 NCR_700_internal_bus_reset(host);
919                 break;
920         case A_SIMPLE_TAG_MSG:
921                 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
922                        pun, lun, hostdata->msgin[1],
923                        NCR_700_phase[(dsps & 0xf00) >> 8]);
924                 /* just ignore it */
925                 break;
926         default:
927                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
928                        host->host_no, pun, lun,
929                        NCR_700_phase[(dsps & 0xf00) >> 8]);
930
931                 spi_print_msg(hostdata->msgin);
932                 printk("\n");
933                 /* just reject it */
934                 hostdata->msgout[0] = A_REJECT_MSG;
935                 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
936                 script_patch_16(hostdata->script, MessageCount, 1);
937                 /* SendMsgOut returns, so set up the return
938                  * address */
939                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
940
941                 break;
942         }
943         NCR_700_writel(temp, host, TEMP_REG);
944         /* set us up to receive another message */
945         dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
946         return resume_offset;
947 }
948
949 STATIC __u32
950 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
951                          struct Scsi_Host *host,
952                          struct NCR_700_Host_Parameters *hostdata)
953 {
954         __u32 resume_offset = 0;
955         __u8 pun = 0xff, lun=0xff;
956
957         if(SCp != NULL) {
958                 pun = SCp->device->id;
959                 lun = SCp->device->lun;
960         }
961
962         if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
963                 DEBUG(("  COMMAND COMPLETE, status=%02x\n",
964                        hostdata->status[0]));
965                 /* OK, if TCQ still under negotiation, we now know it works */
966                 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
967                         NCR_700_set_tag_neg_state(SCp->device,
968                                                   NCR_700_FINISHED_TAG_NEGOTIATION);
969                         
970                 /* check for contingent allegiance contitions */
971                 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
972                    status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
973                         struct NCR_700_command_slot *slot =
974                                 (struct NCR_700_command_slot *)SCp->host_scribble;
975                         if(SCp->cmnd[0] == REQUEST_SENSE) {
976                                 /* OOPS: bad device, returning another
977                                  * contingent allegiance condition */
978                                 scmd_printk(KERN_ERR, SCp,
979                                         "broken device is looping in contingent allegiance: ignoring\n");
980                                 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
981                         } else {
982 #ifdef NCR_DEBUG
983                                 scsi_print_command(SCp);
984                                 printk("  cmd %p has status %d, requesting sense\n",
985                                        SCp, hostdata->status[0]);
986 #endif
987                                 /* we can destroy the command here
988                                  * because the contingent allegiance
989                                  * condition will cause a retry which
990                                  * will re-copy the command from the
991                                  * saved data_cmnd.  We also unmap any
992                                  * data associated with the command
993                                  * here */
994                                 NCR_700_unmap(hostdata, SCp, slot);
995
996                                 SCp->cmnd[0] = REQUEST_SENSE;
997                                 SCp->cmnd[1] = (SCp->device->lun & 0x7) << 5;
998                                 SCp->cmnd[2] = 0;
999                                 SCp->cmnd[3] = 0;
1000                                 SCp->cmnd[4] = sizeof(SCp->sense_buffer);
1001                                 SCp->cmnd[5] = 0;
1002                                 SCp->cmd_len = 6;
1003                                 /* Here's a quiet hack: the
1004                                  * REQUEST_SENSE command is six bytes,
1005                                  * so store a flag indicating that
1006                                  * this was an internal sense request
1007                                  * and the original status at the end
1008                                  * of the command */
1009                                 SCp->cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1010                                 SCp->cmnd[7] = hostdata->status[0];
1011                                 SCp->use_sg = 0;
1012                                 SCp->sc_data_direction = DMA_FROM_DEVICE;
1013                                 dma_sync_single_for_device(hostdata->dev, slot->pCmd,
1014                                                            SCp->cmd_len, DMA_TO_DEVICE);
1015                                 SCp->request_bufflen = sizeof(SCp->sense_buffer);
1016                                 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1017                                 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
1018                                 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1019                                 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1020                                 slot->SG[1].pAddr = 0;
1021                                 slot->resume_offset = hostdata->pScript;
1022                                 dma_cache_sync(slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1023                                 dma_cache_sync(SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1024                                 
1025                                 /* queue the command for reissue */
1026                                 slot->state = NCR_700_SLOT_QUEUED;
1027                                 hostdata->state = NCR_700_HOST_FREE;
1028                                 hostdata->cmd = NULL;
1029                         }
1030                 } else {
1031                         // Currently rely on the mid layer evaluation
1032                         // of the tag queuing capability
1033                         //
1034                         //if(status_byte(hostdata->status[0]) == GOOD &&
1035                         //   SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1036                         //      /* Piggy back the tag queueing support
1037                         //       * on this command */
1038                         //      dma_sync_single_for_cpu(hostdata->dev,
1039                         //                          slot->dma_handle,
1040                         //                          SCp->request_bufflen,
1041                         //                          DMA_FROM_DEVICE);
1042                         //      if(((char *)SCp->request_buffer)[7] & 0x02) {
1043                         //              scmd_printk(KERN_INFO, SCp,
1044                         //                   "Enabling Tag Command Queuing\n");
1045                         //              hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1046                         //              NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1047                         //      } else {
1048                         //              NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1049                         //              hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1050                         //      }
1051                         //}
1052                         NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1053                 }
1054         } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1055                 __u8 i = (dsps & 0xf00) >> 8;
1056
1057                 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1058                        NCR_700_phase[i],
1059                        sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1060                 scmd_printk(KERN_ERR, SCp, "         len = %d, cmd =",
1061                         SCp->cmd_len);
1062                 scsi_print_command(SCp);
1063
1064                 NCR_700_internal_bus_reset(host);
1065         } else if((dsps & 0xfffff000) == A_FATAL) {
1066                 int i = (dsps & 0xfff);
1067
1068                 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1069                        host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1070                 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1071                         printk(KERN_ERR "     msg begins %02x %02x\n",
1072                                hostdata->msgin[0], hostdata->msgin[1]);
1073                 }
1074                 NCR_700_internal_bus_reset(host);
1075         } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1076 #ifdef NCR_700_DEBUG
1077                 __u8 i = (dsps & 0xf00) >> 8;
1078
1079                 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1080                        host->host_no, pun, lun,
1081                        i, NCR_700_phase[i]);
1082 #endif
1083                 save_for_reselection(hostdata, SCp, dsp);
1084
1085         } else if(dsps == A_RESELECTION_IDENTIFIED) {
1086                 __u8 lun;
1087                 struct NCR_700_command_slot *slot;
1088                 __u8 reselection_id = hostdata->reselection_id;
1089                 struct scsi_device *SDp;
1090
1091                 lun = hostdata->msgin[0] & 0x1f;
1092
1093                 hostdata->reselection_id = 0xff;
1094                 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1095                        host->host_no, reselection_id, lun));
1096                 /* clear the reselection indicator */
1097                 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1098                 if(unlikely(SDp == NULL)) {
1099                         printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1100                                host->host_no, reselection_id, lun);
1101                         BUG();
1102                 }
1103                 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1104                         struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1105                         if(unlikely(SCp == NULL)) {
1106                                 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n", 
1107                                        host->host_no, reselection_id, lun, hostdata->msgin[2]);
1108                                 BUG();
1109                         }
1110
1111                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1112                         DDEBUG(KERN_DEBUG, SDp,
1113                                 "reselection is tag %d, slot %p(%d)\n",
1114                                 hostdata->msgin[2], slot, slot->tag);
1115                 } else {
1116                         struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1117                         if(unlikely(SCp == NULL)) {
1118                                 sdev_printk(KERN_ERR, SDp,
1119                                         "no saved request for untagged cmd\n");
1120                                 BUG();
1121                         }
1122                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1123                 }
1124
1125                 if(slot == NULL) {
1126                         printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1127                                host->host_no, reselection_id, lun,
1128                                hostdata->msgin[0], hostdata->msgin[1],
1129                                hostdata->msgin[2]);
1130                 } else {
1131                         if(hostdata->state != NCR_700_HOST_BUSY)
1132                                 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1133                                        host->host_no);
1134                         resume_offset = slot->resume_offset;
1135                         hostdata->cmd = slot->cmnd;
1136
1137                         /* re-patch for this command */
1138                         script_patch_32_abs(hostdata->script, CommandAddress, 
1139                                             slot->pCmd);
1140                         script_patch_16(hostdata->script,
1141                                         CommandCount, slot->cmnd->cmd_len);
1142                         script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1143                                             to32bit(&slot->pSG[0].ins));
1144
1145                         /* Note: setting SXFER only works if we're
1146                          * still in the MESSAGE phase, so it is vital
1147                          * that ACK is still asserted when we process
1148                          * the reselection message.  The resume offset
1149                          * should therefore always clear ACK */
1150                         NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1151                                        host, SXFER_REG);
1152                         dma_cache_sync(hostdata->msgin,
1153                                        MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1154                         dma_cache_sync(hostdata->msgout,
1155                                        MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1156                         /* I'm just being paranoid here, the command should
1157                          * already have been flushed from the cache */
1158                         dma_cache_sync(slot->cmnd->cmnd,
1159                                        slot->cmnd->cmd_len, DMA_TO_DEVICE);
1160
1161
1162                         
1163                 }
1164         } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1165
1166                 /* This section is full of debugging code because I've
1167                  * never managed to reach it.  I think what happens is
1168                  * that, because the 700 runs with selection
1169                  * interrupts enabled the whole time that we take a
1170                  * selection interrupt before we manage to get to the
1171                  * reselected script interrupt */
1172
1173                 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1174                 struct NCR_700_command_slot *slot;
1175                 
1176                 /* Take out our own ID */
1177                 reselection_id &= ~(1<<host->this_id);
1178                 
1179                 /* I've never seen this happen, so keep this as a printk rather
1180                  * than a debug */
1181                 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1182                        host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1183
1184                 {
1185                         /* FIXME: DEBUGGING CODE */
1186                         __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1187                         int i;
1188
1189                         for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1190                                 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1191                                    && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1192                                         break;
1193                         }
1194                         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);
1195                         SCp =  hostdata->slots[i].cmnd;
1196                 }
1197
1198                 if(SCp != NULL) {
1199                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1200                         /* change slot from busy to queued to redo command */
1201                         slot->state = NCR_700_SLOT_QUEUED;
1202                 }
1203                 hostdata->cmd = NULL;
1204                 
1205                 if(reselection_id == 0) {
1206                         if(hostdata->reselection_id == 0xff) {
1207                                 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1208                                 return 0;
1209                         } else {
1210                                 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1211                                        host->host_no);
1212                                 reselection_id = hostdata->reselection_id;
1213                         }
1214                 } else {
1215                         
1216                         /* convert to real ID */
1217                         reselection_id = bitmap_to_number(reselection_id);
1218                 }
1219                 hostdata->reselection_id = reselection_id;
1220                 /* just in case we have a stale simple tag message, clear it */
1221                 hostdata->msgin[1] = 0;
1222                 dma_cache_sync(hostdata->msgin,
1223                                MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1224                 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1225                         resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1226                 } else {
1227                         resume_offset = hostdata->pScript + Ent_GetReselectionData;
1228                 }
1229         } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1230                 /* we've just disconnected from the bus, do nothing since
1231                  * a return here will re-run the queued command slot
1232                  * that may have been interrupted by the initial selection */
1233                 DEBUG((" SELECTION COMPLETED\n"));
1234         } else if((dsps & 0xfffff0f0) == A_MSG_IN) { 
1235                 resume_offset = process_message(host, hostdata, SCp,
1236                                                 dsp, dsps);
1237         } else if((dsps &  0xfffff000) == 0) {
1238                 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1239                 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1240                        host->host_no, pun, lun, NCR_700_condition[i],
1241                        NCR_700_phase[j], dsp - hostdata->pScript);
1242                 if(SCp != NULL) {
1243                         scsi_print_command(SCp);
1244
1245                         if(SCp->use_sg) {
1246                                 for(i = 0; i < SCp->use_sg + 1; i++) {
1247                                         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);
1248                                 }
1249                         }
1250                 }              
1251                 NCR_700_internal_bus_reset(host);
1252         } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1253                 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1254                        host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1255                 resume_offset = dsp;
1256         } else {
1257                 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1258                        host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1259                 NCR_700_internal_bus_reset(host);
1260         }
1261         return resume_offset;
1262 }
1263
1264 /* We run the 53c700 with selection interrupts always enabled.  This
1265  * means that the chip may be selected as soon as the bus frees.  On a
1266  * busy bus, this can be before the scripts engine finishes its
1267  * processing.  Therefore, part of the selection processing has to be
1268  * to find out what the scripts engine is doing and complete the
1269  * function if necessary (i.e. process the pending disconnect or save
1270  * the interrupted initial selection */
1271 STATIC inline __u32
1272 process_selection(struct Scsi_Host *host, __u32 dsp)
1273 {
1274         __u8 id = 0;    /* Squash compiler warning */
1275         int count = 0;
1276         __u32 resume_offset = 0;
1277         struct NCR_700_Host_Parameters *hostdata =
1278                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1279         struct scsi_cmnd *SCp = hostdata->cmd;
1280         __u8 sbcl;
1281
1282         for(count = 0; count < 5; count++) {
1283                 id = NCR_700_readb(host, hostdata->chip710 ?
1284                                    CTEST9_REG : SFBR_REG);
1285
1286                 /* Take out our own ID */
1287                 id &= ~(1<<host->this_id);
1288                 if(id != 0) 
1289                         break;
1290                 udelay(5);
1291         }
1292         sbcl = NCR_700_readb(host, SBCL_REG);
1293         if((sbcl & SBCL_IO) == 0) {
1294                 /* mark as having been selected rather than reselected */
1295                 id = 0xff;
1296         } else {
1297                 /* convert to real ID */
1298                 hostdata->reselection_id = id = bitmap_to_number(id);
1299                 DEBUG(("scsi%d:  Reselected by %d\n",
1300                        host->host_no, id));
1301         }
1302         if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1303                 struct NCR_700_command_slot *slot =
1304                         (struct NCR_700_command_slot *)SCp->host_scribble;
1305                 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));
1306                 
1307                 switch(dsp - hostdata->pScript) {
1308                 case Ent_Disconnect1:
1309                 case Ent_Disconnect2:
1310                         save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1311                         break;
1312                 case Ent_Disconnect3:
1313                 case Ent_Disconnect4:
1314                         save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1315                         break;
1316                 case Ent_Disconnect5:
1317                 case Ent_Disconnect6:
1318                         save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1319                         break;
1320                 case Ent_Disconnect7:
1321                 case Ent_Disconnect8:
1322                         save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1323                         break;
1324                 case Ent_Finish1:
1325                 case Ent_Finish2:
1326                         process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1327                         break;
1328                         
1329                 default:
1330                         slot->state = NCR_700_SLOT_QUEUED;
1331                         break;
1332                         }
1333         }
1334         hostdata->state = NCR_700_HOST_BUSY;
1335         hostdata->cmd = NULL;
1336         /* clear any stale simple tag message */
1337         hostdata->msgin[1] = 0;
1338         dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1339                        DMA_BIDIRECTIONAL);
1340
1341         if(id == 0xff) {
1342                 /* Selected as target, Ignore */
1343                 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1344         } else if(hostdata->tag_negotiated & (1<<id)) {
1345                 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1346         } else {
1347                 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1348         }
1349         return resume_offset;
1350 }
1351
1352 static inline void
1353 NCR_700_clear_fifo(struct Scsi_Host *host) {
1354         const struct NCR_700_Host_Parameters *hostdata
1355                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1356         if(hostdata->chip710) {
1357                 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1358         } else {
1359                 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1360         }
1361 }
1362
1363 static inline void
1364 NCR_700_flush_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(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1369                 udelay(10);
1370                 NCR_700_writeb(0, host, CTEST8_REG);
1371         } else {
1372                 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1373                 udelay(10);
1374                 NCR_700_writeb(0, host, DFIFO_REG);
1375         }
1376 }
1377
1378
1379 /* The queue lock with interrupts disabled must be held on entry to
1380  * this function */
1381 STATIC int
1382 NCR_700_start_command(struct scsi_cmnd *SCp)
1383 {
1384         struct NCR_700_command_slot *slot =
1385                 (struct NCR_700_command_slot *)SCp->host_scribble;
1386         struct NCR_700_Host_Parameters *hostdata =
1387                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1388         __u16 count = 1;        /* for IDENTIFY message */
1389         
1390         if(hostdata->state != NCR_700_HOST_FREE) {
1391                 /* keep this inside the lock to close the race window where
1392                  * the running command finishes on another CPU while we don't
1393                  * change the state to queued on this one */
1394                 slot->state = NCR_700_SLOT_QUEUED;
1395
1396                 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1397                        SCp->device->host->host_no, slot->cmnd, slot));
1398                 return 0;
1399         }
1400         hostdata->state = NCR_700_HOST_BUSY;
1401         hostdata->cmd = SCp;
1402         slot->state = NCR_700_SLOT_BUSY;
1403         /* keep interrupts disabled until we have the command correctly
1404          * set up so we cannot take a selection interrupt */
1405
1406         hostdata->msgout[0] = NCR_700_identify(SCp->cmnd[0] != REQUEST_SENSE,
1407                                                SCp->device->lun);
1408         /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1409          * if the negotiated transfer parameters still hold, so
1410          * always renegotiate them */
1411         if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE) {
1412                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1413         }
1414
1415         /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1416          * If a contingent allegiance condition exists, the device
1417          * will refuse all tags, so send the request sense as untagged
1418          * */
1419         if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1420            && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE)) {
1421                 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1422         }
1423
1424         if(hostdata->fast &&
1425            NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1426                 count += spi_populate_sync_msg(&hostdata->msgout[count],
1427                                 spi_period(SCp->device->sdev_target),
1428                                 spi_offset(SCp->device->sdev_target));
1429                 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1430         }
1431
1432         script_patch_16(hostdata->script, MessageCount, count);
1433
1434
1435         script_patch_ID(hostdata->script,
1436                         Device_ID, 1<<scmd_id(SCp));
1437
1438         script_patch_32_abs(hostdata->script, CommandAddress, 
1439                             slot->pCmd);
1440         script_patch_16(hostdata->script, CommandCount, SCp->cmd_len);
1441         /* finally plumb the beginning of the SG list into the script
1442          * */
1443         script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1444                             to32bit(&slot->pSG[0].ins));
1445         NCR_700_clear_fifo(SCp->device->host);
1446
1447         if(slot->resume_offset == 0)
1448                 slot->resume_offset = hostdata->pScript;
1449         /* now perform all the writebacks and invalidates */
1450         dma_cache_sync(hostdata->msgout, count, DMA_TO_DEVICE);
1451         dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1452                        DMA_FROM_DEVICE);
1453         dma_cache_sync(SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1454         dma_cache_sync(hostdata->status, 1, DMA_FROM_DEVICE);
1455
1456         /* set the synchronous period/offset */
1457         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1458                        SCp->device->host, SXFER_REG);
1459         NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1460         NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1461
1462         return 1;
1463 }
1464
1465 irqreturn_t
1466 NCR_700_intr(int irq, void *dev_id, struct pt_regs *regs)
1467 {
1468         struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1469         struct NCR_700_Host_Parameters *hostdata =
1470                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1471         __u8 istat;
1472         __u32 resume_offset = 0;
1473         __u8 pun = 0xff, lun = 0xff;
1474         unsigned long flags;
1475         int handled = 0;
1476
1477         /* Use the host lock to serialise acess to the 53c700
1478          * hardware.  Note: In future, we may need to take the queue
1479          * lock to enter the done routines.  When that happens, we
1480          * need to ensure that for this driver, the host lock and the
1481          * queue lock point to the same thing. */
1482         spin_lock_irqsave(host->host_lock, flags);
1483         if((istat = NCR_700_readb(host, ISTAT_REG))
1484               & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1485                 __u32 dsps;
1486                 __u8 sstat0 = 0, dstat = 0;
1487                 __u32 dsp;
1488                 struct scsi_cmnd *SCp = hostdata->cmd;
1489                 enum NCR_700_Host_State state;
1490
1491                 handled = 1;
1492                 state = hostdata->state;
1493                 SCp = hostdata->cmd;
1494
1495                 if(istat & SCSI_INT_PENDING) {
1496                         udelay(10);
1497
1498                         sstat0 = NCR_700_readb(host, SSTAT0_REG);
1499                 }
1500
1501                 if(istat & DMA_INT_PENDING) {
1502                         udelay(10);
1503
1504                         dstat = NCR_700_readb(host, DSTAT_REG);
1505                 }
1506
1507                 dsps = NCR_700_readl(host, DSPS_REG);
1508                 dsp = NCR_700_readl(host, DSP_REG);
1509
1510                 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1511                        host->host_no, istat, sstat0, dstat,
1512                        (dsp - (__u32)(hostdata->pScript))/4,
1513                        dsp, dsps));
1514
1515                 if(SCp != NULL) {
1516                         pun = SCp->device->id;
1517                         lun = SCp->device->lun;
1518                 }
1519
1520                 if(sstat0 & SCSI_RESET_DETECTED) {
1521                         struct scsi_device *SDp;
1522                         int i;
1523
1524                         hostdata->state = NCR_700_HOST_BUSY;
1525
1526                         printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1527                                host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1528
1529                         scsi_report_bus_reset(host, 0);
1530
1531                         /* clear all the negotiated parameters */
1532                         __shost_for_each_device(SDp, host)
1533                                 SDp->hostdata = NULL;
1534                         
1535                         /* clear all the slots and their pending commands */
1536                         for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1537                                 struct scsi_cmnd *SCp;
1538                                 struct NCR_700_command_slot *slot =
1539                                         &hostdata->slots[i];
1540
1541                                 if(slot->state == NCR_700_SLOT_FREE)
1542                                         continue;
1543                                 
1544                                 SCp = slot->cmnd;
1545                                 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1546                                        slot, SCp);
1547                                 free_slot(slot, hostdata);
1548                                 SCp->host_scribble = NULL;
1549                                 NCR_700_set_depth(SCp->device, 0);
1550                                 /* NOTE: deadlock potential here: we
1551                                  * rely on mid-layer guarantees that
1552                                  * scsi_done won't try to issue the
1553                                  * command again otherwise we'll
1554                                  * deadlock on the
1555                                  * hostdata->state_lock */
1556                                 SCp->result = DID_RESET << 16;
1557                                 SCp->scsi_done(SCp);
1558                         }
1559                         mdelay(25);
1560                         NCR_700_chip_setup(host);
1561
1562                         hostdata->state = NCR_700_HOST_FREE;
1563                         hostdata->cmd = NULL;
1564                         /* signal back if this was an eh induced reset */
1565                         if(hostdata->eh_complete != NULL)
1566                                 complete(hostdata->eh_complete);
1567                         goto out_unlock;
1568                 } else if(sstat0 & SELECTION_TIMEOUT) {
1569                         DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1570                                host->host_no, pun, lun));
1571                         NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1572                 } else if(sstat0 & PHASE_MISMATCH) {
1573                         struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1574                                 (struct NCR_700_command_slot *)SCp->host_scribble;
1575
1576                         if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1577                                 /* It wants to reply to some part of
1578                                  * our message */
1579 #ifdef NCR_700_DEBUG
1580                                 __u32 temp = NCR_700_readl(host, TEMP_REG);
1581                                 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1582                                 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)));
1583 #endif
1584                                 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1585                         } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1586                                   dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1587                                 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1588                                 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1589                                 int residual = NCR_700_data_residual(host);
1590                                 int i;
1591 #ifdef NCR_700_DEBUG
1592                                 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1593
1594                                 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1595                                        host->host_no, pun, lun,
1596                                        SGcount, data_transfer);
1597                                 scsi_print_command(SCp);
1598                                 if(residual) {
1599                                         printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1600                                        host->host_no, pun, lun,
1601                                        SGcount, data_transfer, residual);
1602                                 }
1603 #endif
1604                                 data_transfer += residual;
1605
1606                                 if(data_transfer != 0) {
1607                                         int count; 
1608                                         __u32 pAddr;
1609
1610                                         SGcount--;
1611
1612                                         count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1613                                         DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1614                                         slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1615                                         slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1616                                         pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1617                                         pAddr += (count - data_transfer);
1618 #ifdef NCR_700_DEBUG
1619                                         if(pAddr != naddr) {
1620                                                 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);
1621                                         }
1622 #endif
1623                                         slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1624                                 }
1625                                 /* set the executed moves to nops */
1626                                 for(i=0; i<SGcount; i++) {
1627                                         slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1628                                         slot->SG[i].pAddr = 0;
1629                                 }
1630                                 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1631                                 /* and pretend we disconnected after
1632                                  * the command phase */
1633                                 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1634                                 /* make sure all the data is flushed */
1635                                 NCR_700_flush_fifo(host);
1636                         } else {
1637                                 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1638                                 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1639                                        host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1640                                 NCR_700_internal_bus_reset(host);
1641                         }
1642
1643                 } else if(sstat0 & SCSI_GROSS_ERROR) {
1644                         printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1645                                host->host_no, pun, lun);
1646                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1647                 } else if(sstat0 & PARITY_ERROR) {
1648                         printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1649                                host->host_no, pun, lun);
1650                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1651                 } else if(dstat & SCRIPT_INT_RECEIVED) {
1652                         DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1653                                host->host_no, pun, lun));
1654                         resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1655                 } else if(dstat & (ILGL_INST_DETECTED)) {
1656                         printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1657                                "         Please email James.Bottomley@HansenPartnership.com with the details\n",
1658                                host->host_no, pun, lun,
1659                                dsp, dsp - hostdata->pScript);
1660                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1661                 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1662                         printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1663                                host->host_no, pun, lun, dstat);
1664                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1665                 }
1666
1667                 
1668                 /* NOTE: selection interrupt processing MUST occur
1669                  * after script interrupt processing to correctly cope
1670                  * with the case where we process a disconnect and
1671                  * then get reselected before we process the
1672                  * disconnection */
1673                 if(sstat0 & SELECTED) {
1674                         /* FIXME: It currently takes at least FOUR
1675                          * interrupts to complete a command that
1676                          * disconnects: one for the disconnect, one
1677                          * for the reselection, one to get the
1678                          * reselection data and one to complete the
1679                          * command.  If we guess the reselected
1680                          * command here and prepare it, we only need
1681                          * to get a reselection data interrupt if we
1682                          * guessed wrongly.  Since the interrupt
1683                          * overhead is much greater than the command
1684                          * setup, this would be an efficient
1685                          * optimisation particularly as we probably
1686                          * only have one outstanding command on a
1687                          * target most of the time */
1688
1689                         resume_offset = process_selection(host, dsp);
1690
1691                 }
1692
1693         }
1694
1695         if(resume_offset) {
1696                 if(hostdata->state != NCR_700_HOST_BUSY) {
1697                         printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1698                                host->host_no, resume_offset, resume_offset - hostdata->pScript);
1699                         hostdata->state = NCR_700_HOST_BUSY;
1700                 }
1701
1702                 DEBUG(("Attempting to resume at %x\n", resume_offset));
1703                 NCR_700_clear_fifo(host);
1704                 NCR_700_writel(resume_offset, host, DSP_REG);
1705         } 
1706         /* There is probably a technical no-no about this: If we're a
1707          * shared interrupt and we got this interrupt because the
1708          * other device needs servicing not us, we're still going to
1709          * check our queued commands here---of course, there shouldn't
1710          * be any outstanding.... */
1711         if(hostdata->state == NCR_700_HOST_FREE) {
1712                 int i;
1713
1714                 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1715                         /* fairness: always run the queue from the last
1716                          * position we left off */
1717                         int j = (i + hostdata->saved_slot_position)
1718                                 % NCR_700_COMMAND_SLOTS_PER_HOST;
1719                         
1720                         if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1721                                 continue;
1722                         if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1723                                 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1724                                        host->host_no, &hostdata->slots[j],
1725                                        hostdata->slots[j].cmnd));
1726                                 hostdata->saved_slot_position = j + 1;
1727                         }
1728
1729                         break;
1730                 }
1731         }
1732  out_unlock:
1733         spin_unlock_irqrestore(host->host_lock, flags);
1734         return IRQ_RETVAL(handled);
1735 }
1736
1737 STATIC int
1738 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1739 {
1740         struct NCR_700_Host_Parameters *hostdata = 
1741                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1742         __u32 move_ins;
1743         enum dma_data_direction direction;
1744         struct NCR_700_command_slot *slot;
1745
1746         if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1747                 /* We're over our allocation, this should never happen
1748                  * since we report the max allocation to the mid layer */
1749                 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1750                 return 1;
1751         }
1752         /* check for untagged commands.  We cannot have any outstanding
1753          * commands if we accept them.  Commands could be untagged because:
1754          *
1755          * - The tag negotiated bitmap is clear
1756          * - The blk layer sent and untagged command
1757          */
1758         if(NCR_700_get_depth(SCp->device) != 0
1759            && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1760                || !blk_rq_tagged(SCp->request))) {
1761                 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1762                        NCR_700_get_depth(SCp->device));
1763                 return SCSI_MLQUEUE_DEVICE_BUSY;
1764         }
1765         if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1766                 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1767                        NCR_700_get_depth(SCp->device));
1768                 return SCSI_MLQUEUE_DEVICE_BUSY;
1769         }
1770         NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1771
1772         /* begin the command here */
1773         /* no need to check for NULL, test for command_slot_count above
1774          * ensures a slot is free */
1775         slot = find_empty_slot(hostdata);
1776
1777         slot->cmnd = SCp;
1778
1779         SCp->scsi_done = done;
1780         SCp->host_scribble = (unsigned char *)slot;
1781         SCp->SCp.ptr = NULL;
1782         SCp->SCp.buffer = NULL;
1783
1784 #ifdef NCR_700_DEBUG
1785         printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1786         scsi_print_command(SCp);
1787 #endif
1788         if(blk_rq_tagged(SCp->request)
1789            && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1790            && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1791                 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1792                 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1793                 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1794         }
1795
1796         /* here we may have to process an untagged command.  The gate
1797          * above ensures that this will be the only one outstanding,
1798          * so clear the tag negotiated bit.
1799          *
1800          * FIXME: This will royally screw up on multiple LUN devices
1801          * */
1802         if(!blk_rq_tagged(SCp->request)
1803            && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1804                 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1805                 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1806         }
1807
1808         if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1809            && scsi_get_tag_type(SCp->device)) {
1810                 slot->tag = SCp->request->tag;
1811                 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1812                        slot->tag, slot);
1813         } else {
1814                 slot->tag = SCSI_NO_TAG;
1815                 /* must populate current_cmnd for scsi_find_tag to work */
1816                 SCp->device->current_cmnd = SCp;
1817         }
1818         /* sanity check: some of the commands generated by the mid-layer
1819          * have an eccentric idea of their sc_data_direction */
1820         if(!SCp->use_sg && !SCp->request_bufflen 
1821            && SCp->sc_data_direction != DMA_NONE) {
1822 #ifdef NCR_700_DEBUG
1823                 printk("53c700: Command");
1824                 scsi_print_command(SCp);
1825                 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1826 #endif
1827                 SCp->sc_data_direction = DMA_NONE;
1828         }
1829
1830         switch (SCp->cmnd[0]) {
1831         case REQUEST_SENSE:
1832                 /* clear the internal sense magic */
1833                 SCp->cmnd[6] = 0;
1834                 /* fall through */
1835         default:
1836                 /* OK, get it from the command */
1837                 switch(SCp->sc_data_direction) {
1838                 case DMA_BIDIRECTIONAL:
1839                 default:
1840                         printk(KERN_ERR "53c700: Unknown command for data direction ");
1841                         scsi_print_command(SCp);
1842                         
1843                         move_ins = 0;
1844                         break;
1845                 case DMA_NONE:
1846                         move_ins = 0;
1847                         break;
1848                 case DMA_FROM_DEVICE:
1849                         move_ins = SCRIPT_MOVE_DATA_IN;
1850                         break;
1851                 case DMA_TO_DEVICE:
1852                         move_ins = SCRIPT_MOVE_DATA_OUT;
1853                         break;
1854                 }
1855         }
1856
1857         /* now build the scatter gather list */
1858         direction = SCp->sc_data_direction;
1859         if(move_ins != 0) {
1860                 int i;
1861                 int sg_count;
1862                 dma_addr_t vPtr = 0;
1863                 __u32 count = 0;
1864
1865                 if(SCp->use_sg) {
1866                         sg_count = dma_map_sg(hostdata->dev, SCp->buffer,
1867                                               SCp->use_sg, direction);
1868                 } else {
1869                         vPtr = dma_map_single(hostdata->dev,
1870                                               SCp->request_buffer, 
1871                                               SCp->request_bufflen,
1872                                               direction);
1873                         count = SCp->request_bufflen;
1874                         slot->dma_handle = vPtr;
1875                         sg_count = 1;
1876                 }
1877                         
1878
1879                 for(i = 0; i < sg_count; i++) {
1880
1881                         if(SCp->use_sg) {
1882                                 struct scatterlist *sg = SCp->buffer;
1883
1884                                 vPtr = sg_dma_address(&sg[i]);
1885                                 count = sg_dma_len(&sg[i]);
1886                         }
1887
1888                         slot->SG[i].ins = bS_to_host(move_ins | count);
1889                         DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1890                                i, count, slot->SG[i].ins, (unsigned long)vPtr));
1891                         slot->SG[i].pAddr = bS_to_host(vPtr);
1892                 }
1893                 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1894                 slot->SG[i].pAddr = 0;
1895                 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1896                 DEBUG((" SETTING %08lx to %x\n",
1897                        (&slot->pSG[i].ins), 
1898                        slot->SG[i].ins));
1899         }
1900         slot->resume_offset = 0;
1901         slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1902                                     sizeof(SCp->cmnd), DMA_TO_DEVICE);
1903         NCR_700_start_command(SCp);
1904         return 0;
1905 }
1906
1907 STATIC int
1908 NCR_700_abort(struct scsi_cmnd * SCp)
1909 {
1910         struct NCR_700_command_slot *slot;
1911
1912         scmd_printk(KERN_INFO, SCp,
1913                 "New error handler wants to abort command\n\t");
1914         scsi_print_command(SCp);
1915
1916         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1917
1918         if(slot == NULL)
1919                 /* no outstanding command to abort */
1920                 return SUCCESS;
1921         if(SCp->cmnd[0] == TEST_UNIT_READY) {
1922                 /* FIXME: This is because of a problem in the new
1923                  * error handler.  When it is in error recovery, it
1924                  * will send a TUR to a device it thinks may still be
1925                  * showing a problem.  If the TUR isn't responded to,
1926                  * it will abort it and mark the device off line.
1927                  * Unfortunately, it does no other error recovery, so
1928                  * this would leave us with an outstanding command
1929                  * occupying a slot.  Rather than allow this to
1930                  * happen, we issue a bus reset to force all
1931                  * outstanding commands to terminate here. */
1932                 NCR_700_internal_bus_reset(SCp->device->host);
1933                 /* still drop through and return failed */
1934         }
1935         return FAILED;
1936
1937 }
1938
1939 STATIC int
1940 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1941 {
1942         DECLARE_COMPLETION(complete);
1943         struct NCR_700_Host_Parameters *hostdata = 
1944                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1945
1946         scmd_printk(KERN_INFO, SCp,
1947                 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1948         scsi_print_command(SCp);
1949
1950         /* In theory, eh_complete should always be null because the
1951          * eh is single threaded, but just in case we're handling a
1952          * reset via sg or something */
1953         spin_lock_irq(SCp->device->host->host_lock);
1954         while (hostdata->eh_complete != NULL) {
1955                 spin_unlock_irq(SCp->device->host->host_lock);
1956                 msleep_interruptible(100);
1957                 spin_lock_irq(SCp->device->host->host_lock);
1958         }
1959
1960         hostdata->eh_complete = &complete;
1961         NCR_700_internal_bus_reset(SCp->device->host);
1962
1963         spin_unlock_irq(SCp->device->host->host_lock);
1964         wait_for_completion(&complete);
1965         spin_lock_irq(SCp->device->host->host_lock);
1966
1967         hostdata->eh_complete = NULL;
1968         /* Revalidate the transport parameters of the failing device */
1969         if(hostdata->fast)
1970                 spi_schedule_dv_device(SCp->device);
1971
1972         spin_unlock_irq(SCp->device->host->host_lock);
1973         return SUCCESS;
1974 }
1975
1976 STATIC int
1977 NCR_700_host_reset(struct scsi_cmnd * SCp)
1978 {
1979         scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1980         scsi_print_command(SCp);
1981
1982         spin_lock_irq(SCp->device->host->host_lock);
1983
1984         NCR_700_internal_bus_reset(SCp->device->host);
1985         NCR_700_chip_reset(SCp->device->host);
1986
1987         spin_unlock_irq(SCp->device->host->host_lock);
1988
1989         return SUCCESS;
1990 }
1991
1992 STATIC void
1993 NCR_700_set_period(struct scsi_target *STp, int period)
1994 {
1995         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1996         struct NCR_700_Host_Parameters *hostdata = 
1997                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
1998         
1999         if(!hostdata->fast)
2000                 return;
2001
2002         if(period < hostdata->min_period)
2003                 period = hostdata->min_period;
2004
2005         spi_period(STp) = period;
2006         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2007                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2008         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2009 }
2010
2011 STATIC void
2012 NCR_700_set_offset(struct scsi_target *STp, int offset)
2013 {
2014         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2015         struct NCR_700_Host_Parameters *hostdata = 
2016                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2017         int max_offset = hostdata->chip710
2018                 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2019         
2020         if(!hostdata->fast)
2021                 return;
2022
2023         if(offset > max_offset)
2024                 offset = max_offset;
2025
2026         /* if we're currently async, make sure the period is reasonable */
2027         if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2028                                     spi_period(STp) > 0xff))
2029                 spi_period(STp) = hostdata->min_period;
2030
2031         spi_offset(STp) = offset;
2032         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2033                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2034         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2035 }
2036
2037
2038
2039 STATIC int
2040 NCR_700_slave_configure(struct scsi_device *SDp)
2041 {
2042         struct NCR_700_Host_Parameters *hostdata = 
2043                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2044
2045         /* to do here: allocate memory; build a queue_full list */
2046         if(SDp->tagged_supported) {
2047                 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2048                 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2049                 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2050         } else {
2051                 /* initialise to default depth */
2052                 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2053         }
2054         if(hostdata->fast) {
2055                 /* Find the correct offset and period via domain validation */
2056                 if (!spi_initial_dv(SDp->sdev_target))
2057                         spi_dv_device(SDp);
2058         } else {
2059                 spi_offset(SDp->sdev_target) = 0;
2060                 spi_period(SDp->sdev_target) = 0;
2061         }
2062         return 0;
2063 }
2064
2065 STATIC void
2066 NCR_700_slave_destroy(struct scsi_device *SDp)
2067 {
2068         /* to do here: deallocate memory */
2069 }
2070
2071 static int
2072 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2073 {
2074         if (depth > NCR_700_MAX_TAGS)
2075                 depth = NCR_700_MAX_TAGS;
2076
2077         scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2078         return depth;
2079 }
2080
2081 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2082 {
2083         int change_tag = ((tag_type ==0 &&  scsi_get_tag_type(SDp) != 0)
2084                           || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2085         struct NCR_700_Host_Parameters *hostdata = 
2086                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2087
2088         scsi_set_tag_type(SDp, tag_type);
2089
2090         /* We have a global (per target) flag to track whether TCQ is
2091          * enabled, so we'll be turning it off for the entire target here.
2092          * our tag algorithm will fail if we mix tagged and untagged commands,
2093          * so quiesce the device before doing this */
2094         if (change_tag)
2095                 scsi_target_quiesce(SDp->sdev_target);
2096
2097         if (!tag_type) {
2098                 /* shift back to the default unqueued number of commands
2099                  * (the user can still raise this) */
2100                 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2101                 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
2102         } else {
2103                 /* Here, we cleared the negotiation flag above, so this
2104                  * will force the driver to renegotiate */
2105                 scsi_activate_tcq(SDp, SDp->queue_depth);
2106                 if (change_tag)
2107                         NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2108         }
2109         if (change_tag)
2110                 scsi_target_resume(SDp->sdev_target);
2111
2112         return tag_type;
2113 }
2114
2115 static ssize_t
2116 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2117 {
2118         struct scsi_device *SDp = to_scsi_device(dev);
2119
2120         return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2121 }
2122
2123 static struct device_attribute NCR_700_active_tags_attr = {
2124         .attr = {
2125                 .name =         "active_tags",
2126                 .mode =         S_IRUGO,
2127         },
2128         .show = NCR_700_show_active_tags,
2129 };
2130
2131 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2132         &NCR_700_active_tags_attr,
2133         NULL,
2134 };
2135
2136 EXPORT_SYMBOL(NCR_700_detect);
2137 EXPORT_SYMBOL(NCR_700_release);
2138 EXPORT_SYMBOL(NCR_700_intr);
2139
2140 static struct spi_function_template NCR_700_transport_functions =  {
2141         .set_period     = NCR_700_set_period,
2142         .show_period    = 1,
2143         .set_offset     = NCR_700_set_offset,
2144         .show_offset    = 1,
2145 };
2146
2147 static int __init NCR_700_init(void)
2148 {
2149         NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2150         if(!NCR_700_transport_template)
2151                 return -ENODEV;
2152         return 0;
2153 }
2154
2155 static void __exit NCR_700_exit(void)
2156 {
2157         spi_release_transport(NCR_700_transport_template);
2158 }
2159
2160 module_init(NCR_700_init);
2161 module_exit(NCR_700_exit);
2162