[PATCH] Driver Core: drivers/s390/net/qeth_sys.c - drivers/usb/gadget/pxa2xx_udc...
[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 <asm/dma.h>
132 #include <asm/system.h>
133 #include <asm/io.h>
134 #include <asm/pgtable.h>
135 #include <asm/byteorder.h>
136
137 #include <scsi/scsi.h>
138 #include <scsi/scsi_cmnd.h>
139 #include <scsi/scsi_dbg.h>
140 #include <scsi/scsi_eh.h>
141 #include <scsi/scsi_host.h>
142 #include <scsi/scsi_tcq.h>
143 #include <scsi/scsi_transport.h>
144 #include <scsi/scsi_transport_spi.h>
145
146 #include "53c700.h"
147
148 /* NOTE: For 64 bit drivers there are points in the code where we use
149  * a non dereferenceable pointer to point to a structure in dma-able
150  * memory (which is 32 bits) so that we can use all of the structure
151  * operations but take the address at the end.  This macro allows us
152  * to truncate the 64 bit pointer down to 32 bits without the compiler
153  * complaining */
154 #define to32bit(x)      ((__u32)((unsigned long)(x)))
155
156 #ifdef NCR_700_DEBUG
157 #define STATIC
158 #else
159 #define STATIC static
160 #endif
161
162 MODULE_AUTHOR("James Bottomley");
163 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
164 MODULE_LICENSE("GPL");
165
166 /* This is the script */
167 #include "53c700_d.h"
168
169
170 STATIC int NCR_700_queuecommand(struct scsi_cmnd *, void (*done)(struct scsi_cmnd *));
171 STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
172 STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
173 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
174 STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
175 STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
176 STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
177 STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
178 static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth);
179 static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
180
181 STATIC struct device_attribute *NCR_700_dev_attrs[];
182
183 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
184
185 static char *NCR_700_phase[] = {
186         "",
187         "after selection",
188         "before command phase",
189         "after command phase",
190         "after status phase",
191         "after data in phase",
192         "after data out phase",
193         "during data phase",
194 };
195
196 static char *NCR_700_condition[] = {
197         "",
198         "NOT MSG_OUT",
199         "UNEXPECTED PHASE",
200         "NOT MSG_IN",
201         "UNEXPECTED MSG",
202         "MSG_IN",
203         "SDTR_MSG RECEIVED",
204         "REJECT_MSG RECEIVED",
205         "DISCONNECT_MSG RECEIVED",
206         "MSG_OUT",
207         "DATA_IN",
208         
209 };
210
211 static char *NCR_700_fatal_messages[] = {
212         "unexpected message after reselection",
213         "still MSG_OUT after message injection",
214         "not MSG_IN after selection",
215         "Illegal message length received",
216 };
217
218 static char *NCR_700_SBCL_bits[] = {
219         "IO ",
220         "CD ",
221         "MSG ",
222         "ATN ",
223         "SEL ",
224         "BSY ",
225         "ACK ",
226         "REQ ",
227 };
228
229 static char *NCR_700_SBCL_to_phase[] = {
230         "DATA_OUT",
231         "DATA_IN",
232         "CMD_OUT",
233         "STATE",
234         "ILLEGAL PHASE",
235         "ILLEGAL PHASE",
236         "MSG OUT",
237         "MSG IN",
238 };
239
240 static __u8 NCR_700_SDTR_msg[] = {
241         0x01,                   /* Extended message */
242         0x03,                   /* Extended message Length */
243         0x01,                   /* SDTR Extended message */
244         NCR_700_MIN_PERIOD,
245         NCR_700_MAX_OFFSET
246 };
247
248 /* This translates the SDTR message offset and period to a value
249  * which can be loaded into the SXFER_REG.
250  *
251  * NOTE: According to SCSI-2, the true transfer period (in ns) is
252  *       actually four times this period value */
253 static inline __u8
254 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
255                                __u8 offset, __u8 period)
256 {
257         int XFERP;
258
259         __u8 min_xferp = (hostdata->chip710
260                           ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
261         __u8 max_offset = (hostdata->chip710
262                            ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
263
264         if(offset == 0)
265                 return 0;
266
267         if(period < hostdata->min_period) {
268                 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_SDTR_msg[3]*4);
269                 period = hostdata->min_period;
270         }
271         XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
272         if(offset > max_offset) {
273                 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
274                        offset, max_offset);
275                 offset = max_offset;
276         }
277         if(XFERP < min_xferp) {
278                 printk(KERN_WARNING "53c700: XFERP %d is less than minium, setting to %d\n",
279                        XFERP,  min_xferp);
280                 XFERP =  min_xferp;
281         }
282         return (offset & 0x0f) | (XFERP & 0x07)<<4;
283 }
284
285 static inline __u8
286 NCR_700_get_SXFER(struct scsi_device *SDp)
287 {
288         struct NCR_700_Host_Parameters *hostdata = 
289                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
290
291         return NCR_700_offset_period_to_sxfer(hostdata,
292                                               spi_offset(SDp->sdev_target),
293                                               spi_period(SDp->sdev_target));
294 }
295
296 struct Scsi_Host *
297 NCR_700_detect(struct scsi_host_template *tpnt,
298                struct NCR_700_Host_Parameters *hostdata, struct device *dev)
299 {
300         dma_addr_t pScript, pSlots;
301         __u8 *memory;
302         __u32 *script;
303         struct Scsi_Host *host;
304         static int banner = 0;
305         int j;
306
307         if(tpnt->sdev_attrs == NULL)
308                 tpnt->sdev_attrs = NCR_700_dev_attrs;
309
310         memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
311                                        &pScript, GFP_KERNEL);
312         if(memory == NULL) {
313                 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
314                 return NULL;
315         }
316
317         script = (__u32 *)memory;
318         hostdata->msgin = memory + MSGIN_OFFSET;
319         hostdata->msgout = memory + MSGOUT_OFFSET;
320         hostdata->status = memory + STATUS_OFFSET;
321         /* all of these offsets are L1_CACHE_BYTES separated.  It is fatal
322          * if this isn't sufficient separation to avoid dma flushing issues */
323         BUG_ON(!dma_is_consistent(pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());
324         hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
325         hostdata->dev = dev;
326                 
327         pSlots = pScript + SLOTS_OFFSET;
328
329         /* Fill in the missing routines from the host template */
330         tpnt->queuecommand = NCR_700_queuecommand;
331         tpnt->eh_abort_handler = NCR_700_abort;
332         tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
333         tpnt->eh_host_reset_handler = NCR_700_host_reset;
334         tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
335         tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
336         tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
337         tpnt->use_clustering = ENABLE_CLUSTERING;
338         tpnt->slave_configure = NCR_700_slave_configure;
339         tpnt->slave_destroy = NCR_700_slave_destroy;
340         tpnt->change_queue_depth = NCR_700_change_queue_depth;
341         tpnt->change_queue_type = NCR_700_change_queue_type;
342         
343         if(tpnt->name == NULL)
344                 tpnt->name = "53c700";
345         if(tpnt->proc_name == NULL)
346                 tpnt->proc_name = "53c700";
347         
348
349         host = scsi_host_alloc(tpnt, 4);
350         if (!host)
351                 return NULL;
352         memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
353                * NCR_700_COMMAND_SLOTS_PER_HOST);
354         for(j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
355                 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
356                                           - (unsigned long)&hostdata->slots[0].SG[0]);
357                 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
358                 if(j == 0)
359                         hostdata->free_list = &hostdata->slots[j];
360                 else
361                         hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
362                 hostdata->slots[j].state = NCR_700_SLOT_FREE;
363         }
364
365         for(j = 0; j < sizeof(SCRIPT)/sizeof(SCRIPT[0]); j++) {
366                 script[j] = bS_to_host(SCRIPT[j]);
367         }
368
369         /* adjust all labels to be bus physical */
370         for(j = 0; j < PATCHES; j++) {
371                 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
372         }
373         /* now patch up fixed addresses. */
374         script_patch_32(script, MessageLocation,
375                         pScript + MSGOUT_OFFSET);
376         script_patch_32(script, StatusAddress,
377                         pScript + STATUS_OFFSET);
378         script_patch_32(script, ReceiveMsgAddress,
379                         pScript + MSGIN_OFFSET);
380
381         hostdata->script = script;
382         hostdata->pScript = pScript;
383         dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
384         hostdata->state = NCR_700_HOST_FREE;
385         hostdata->cmd = NULL;
386         host->max_id = 7;
387         host->max_lun = NCR_700_MAX_LUNS;
388         BUG_ON(NCR_700_transport_template == NULL);
389         host->transportt = NCR_700_transport_template;
390         host->unique_id = (unsigned long)hostdata->base;
391         hostdata->eh_complete = NULL;
392         host->hostdata[0] = (unsigned long)hostdata;
393         /* kick the chip */
394         NCR_700_writeb(0xff, host, CTEST9_REG);
395         if(hostdata->chip710) 
396                 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
397         else
398                 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
399         hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
400         if(banner == 0) {
401                 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
402                 banner = 1;
403         }
404         printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
405                hostdata->chip710 ? "53c710" : 
406                (hostdata->fast ? "53c700-66" : "53c700"),
407                hostdata->rev, hostdata->differential ?
408                "(Differential)" : "");
409         /* reset the chip */
410         NCR_700_chip_reset(host);
411
412         if (scsi_add_host(host, dev)) {
413                 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
414                 scsi_host_put(host);
415                 return NULL;
416         }
417
418         spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
419                 SPI_SIGNAL_SE;
420
421         return host;
422 }
423
424 int
425 NCR_700_release(struct Scsi_Host *host)
426 {
427         struct NCR_700_Host_Parameters *hostdata = 
428                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
429
430         dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
431                                hostdata->script, hostdata->pScript);
432         return 1;
433 }
434
435 static inline __u8
436 NCR_700_identify(int can_disconnect, __u8 lun)
437 {
438         return IDENTIFY_BASE |
439                 ((can_disconnect) ? 0x40 : 0) |
440                 (lun & NCR_700_LUN_MASK);
441 }
442
443 /*
444  * Function : static int data_residual (Scsi_Host *host)
445  *
446  * Purpose : return residual data count of what's in the chip.  If you
447  * really want to know what this function is doing, it's almost a
448  * direct transcription of the algorithm described in the 53c710
449  * guide, except that the DBC and DFIFO registers are only 6 bits
450  * wide on a 53c700.
451  *
452  * Inputs : host - SCSI host */
453 static inline int
454 NCR_700_data_residual (struct Scsi_Host *host) {
455         struct NCR_700_Host_Parameters *hostdata = 
456                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
457         int count, synchronous = 0;
458         unsigned int ddir;
459
460         if(hostdata->chip710) {
461                 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
462                          (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
463         } else {
464                 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
465                          (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
466         }
467         
468         if(hostdata->fast)
469                 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
470         
471         /* get the data direction */
472         ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
473
474         if (ddir) {
475                 /* Receive */
476                 if (synchronous) 
477                         count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
478                 else
479                         if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
480                                 ++count;
481         } else {
482                 /* Send */
483                 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
484                 if (sstat & SODL_REG_FULL)
485                         ++count;
486                 if (synchronous && (sstat & SODR_REG_FULL))
487                         ++count;
488         }
489 #ifdef NCR_700_DEBUG
490         if(count)
491                 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
492 #endif
493         return count;
494 }
495
496 /* print out the SCSI wires and corresponding phase from the SBCL register
497  * in the chip */
498 static inline char *
499 sbcl_to_string(__u8 sbcl)
500 {
501         int i;
502         static char ret[256];
503
504         ret[0]='\0';
505         for(i=0; i<8; i++) {
506                 if((1<<i) & sbcl) 
507                         strcat(ret, NCR_700_SBCL_bits[i]);
508         }
509         strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
510         return ret;
511 }
512
513 static inline __u8
514 bitmap_to_number(__u8 bitmap)
515 {
516         __u8 i;
517
518         for(i=0; i<8 && !(bitmap &(1<<i)); i++)
519                 ;
520         return i;
521 }
522
523 /* Pull a slot off the free list */
524 STATIC struct NCR_700_command_slot *
525 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
526 {
527         struct NCR_700_command_slot *slot = hostdata->free_list;
528
529         if(slot == NULL) {
530                 /* sanity check */
531                 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
532                         printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
533                 return NULL;
534         }
535
536         if(slot->state != NCR_700_SLOT_FREE)
537                 /* should panic! */
538                 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
539                 
540
541         hostdata->free_list = slot->ITL_forw;
542         slot->ITL_forw = NULL;
543
544
545         /* NOTE: set the state to busy here, not queued, since this
546          * indicates the slot is in use and cannot be run by the IRQ
547          * finish routine.  If we cannot queue the command when it
548          * is properly build, we then change to NCR_700_SLOT_QUEUED */
549         slot->state = NCR_700_SLOT_BUSY;
550         hostdata->command_slot_count++;
551         
552         return slot;
553 }
554
555 STATIC void 
556 free_slot(struct NCR_700_command_slot *slot,
557           struct NCR_700_Host_Parameters *hostdata)
558 {
559         if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
560                 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
561         }
562         if(slot->state == NCR_700_SLOT_FREE) {
563                 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
564         }
565         
566         slot->resume_offset = 0;
567         slot->cmnd = NULL;
568         slot->state = NCR_700_SLOT_FREE;
569         slot->ITL_forw = hostdata->free_list;
570         hostdata->free_list = slot;
571         hostdata->command_slot_count--;
572 }
573
574
575 /* This routine really does very little.  The command is indexed on
576    the ITL and (if tagged) the ITLQ lists in _queuecommand */
577 STATIC void
578 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
579                      struct scsi_cmnd *SCp, __u32 dsp)
580 {
581         /* Its just possible that this gets executed twice */
582         if(SCp != NULL) {
583                 struct NCR_700_command_slot *slot =
584                         (struct NCR_700_command_slot *)SCp->host_scribble;
585
586                 slot->resume_offset = dsp;
587         }
588         hostdata->state = NCR_700_HOST_FREE;
589         hostdata->cmd = NULL;
590 }
591
592 STATIC inline void
593 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
594               struct NCR_700_command_slot *slot)
595 {
596         if(SCp->sc_data_direction != DMA_NONE &&
597            SCp->sc_data_direction != DMA_BIDIRECTIONAL) {
598                 if(SCp->use_sg) {
599                         dma_unmap_sg(hostdata->dev, SCp->buffer,
600                                      SCp->use_sg, SCp->sc_data_direction);
601                 } else {
602                         dma_unmap_single(hostdata->dev, slot->dma_handle,
603                                          SCp->request_bufflen,
604                                          SCp->sc_data_direction);
605                 }
606         }
607 }
608
609 STATIC inline void
610 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
611                struct scsi_cmnd *SCp, int result)
612 {
613         hostdata->state = NCR_700_HOST_FREE;
614         hostdata->cmd = NULL;
615
616         if(SCp != NULL) {
617                 struct NCR_700_command_slot *slot = 
618                         (struct NCR_700_command_slot *)SCp->host_scribble;
619                 
620                 NCR_700_unmap(hostdata, SCp, slot);
621                 dma_unmap_single(hostdata->dev, slot->pCmd,
622                                  sizeof(SCp->cmnd), DMA_TO_DEVICE);
623                 if(SCp->cmnd[0] == REQUEST_SENSE && SCp->cmnd[6] == NCR_700_INTERNAL_SENSE_MAGIC) {
624 #ifdef NCR_700_DEBUG
625                         printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
626                                SCp, SCp->cmnd[7], result);
627                         scsi_print_sense("53c700", SCp);
628
629 #endif
630                         /* restore the old result if the request sense was
631                          * successful */
632                         if(result == 0)
633                                 result = SCp->cmnd[7];
634                         /* now restore the original command */
635                         memcpy((void *) SCp->cmnd, (void *) SCp->data_cmnd,
636                                sizeof(SCp->data_cmnd));
637                         SCp->request_buffer = SCp->buffer;
638                         SCp->request_bufflen = SCp->bufflen;
639                         SCp->use_sg = SCp->old_use_sg;
640                         SCp->cmd_len = SCp->old_cmd_len;
641                         SCp->sc_data_direction = SCp->sc_old_data_direction;
642                         SCp->underflow = SCp->old_underflow;
643                         
644                 }
645                 free_slot(slot, hostdata);
646 #ifdef NCR_700_DEBUG
647                 if(NCR_700_get_depth(SCp->device) == 0 ||
648                    NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
649                         printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
650                                NCR_700_get_depth(SCp->device));
651 #endif /* NCR_700_DEBUG */
652                 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
653
654                 SCp->host_scribble = NULL;
655                 SCp->result = result;
656                 SCp->scsi_done(SCp);
657         } else {
658                 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
659         }
660 }
661
662
663 STATIC void
664 NCR_700_internal_bus_reset(struct Scsi_Host *host)
665 {
666         /* Bus reset */
667         NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
668         udelay(50);
669         NCR_700_writeb(0, host, SCNTL1_REG);
670
671 }
672
673 STATIC void
674 NCR_700_chip_setup(struct Scsi_Host *host)
675 {
676         struct NCR_700_Host_Parameters *hostdata = 
677                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
678         __u32 dcntl_extra = 0;
679         __u8 min_period;
680         __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
681
682         if(hostdata->chip710) {
683                 __u8 burst_disable = hostdata->burst_disable
684                         ? BURST_DISABLE : 0;
685                 dcntl_extra = COMPAT_700_MODE;
686
687                 NCR_700_writeb(dcntl_extra, host, DCNTL_REG);
688                 NCR_700_writeb(BURST_LENGTH_8  | hostdata->dmode_extra,
689                                host, DMODE_710_REG);
690                 NCR_700_writeb(burst_disable | (hostdata->differential ? 
691                                                 DIFF : 0), host, CTEST7_REG);
692                 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
693                 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
694                                | AUTO_ATN, host, SCNTL0_REG);
695         } else {
696                 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
697                                host, DMODE_700_REG);
698                 NCR_700_writeb(hostdata->differential ? 
699                                DIFF : 0, host, CTEST7_REG);
700                 if(hostdata->fast) {
701                         /* this is for 700-66, does nothing on 700 */
702                         NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION 
703                                        | GENERATE_RECEIVE_PARITY, host,
704                                        CTEST8_REG);
705                 } else {
706                         NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
707                                        | PARITY | AUTO_ATN, host, SCNTL0_REG);
708                 }
709         }
710
711         NCR_700_writeb(1 << host->this_id, host, SCID_REG);
712         NCR_700_writeb(0, host, SBCL_REG);
713         NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
714
715         NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
716              | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
717
718         NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
719         NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
720         if(hostdata->clock > 75) {
721                 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
722                 /* do the best we can, but the async clock will be out
723                  * of spec: sync divider 2, async divider 3 */
724                 DEBUG(("53c700: sync 2 async 3\n"));
725                 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
726                 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
727                 hostdata->sync_clock = hostdata->clock/2;
728         } else  if(hostdata->clock > 50  && hostdata->clock <= 75) {
729                 /* sync divider 1.5, async divider 3 */
730                 DEBUG(("53c700: sync 1.5 async 3\n"));
731                 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
732                 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
733                 hostdata->sync_clock = hostdata->clock*2;
734                 hostdata->sync_clock /= 3;
735                 
736         } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
737                 /* sync divider 1, async divider 2 */
738                 DEBUG(("53c700: sync 1 async 2\n"));
739                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
740                 NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG);
741                 hostdata->sync_clock = hostdata->clock;
742         } else if(hostdata->clock > 25 && hostdata->clock <=37) {
743                 /* sync divider 1, async divider 1.5 */
744                 DEBUG(("53c700: sync 1 async 1.5\n"));
745                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
746                 NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG);
747                 hostdata->sync_clock = hostdata->clock;
748         } else {
749                 DEBUG(("53c700: sync 1 async 1\n"));
750                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
751                 NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG);
752                 /* sync divider 1, async divider 1 */
753                 hostdata->sync_clock = hostdata->clock;
754         }
755         /* Calculate the actual minimum period that can be supported
756          * by our synchronous clock speed.  See the 710 manual for
757          * exact details of this calculation which is based on a
758          * setting of the SXFER register */
759         min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
760         hostdata->min_period = NCR_700_MIN_PERIOD;
761         if(min_period > NCR_700_MIN_PERIOD)
762                 hostdata->min_period = min_period;
763 }
764
765 STATIC void
766 NCR_700_chip_reset(struct Scsi_Host *host)
767 {
768         struct NCR_700_Host_Parameters *hostdata = 
769                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
770         if(hostdata->chip710) {
771                 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
772                 udelay(100);
773
774                 NCR_700_writeb(0, host, ISTAT_REG);
775         } else {
776                 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
777                 udelay(100);
778                 
779                 NCR_700_writeb(0, host, DCNTL_REG);
780         }
781
782         mdelay(1000);
783
784         NCR_700_chip_setup(host);
785 }
786
787 /* The heart of the message processing engine is that the instruction
788  * immediately after the INT is the normal case (and so must be CLEAR
789  * ACK).  If we want to do something else, we call that routine in
790  * scripts and set temp to be the normal case + 8 (skipping the CLEAR
791  * ACK) so that the routine returns correctly to resume its activity
792  * */
793 STATIC __u32
794 process_extended_message(struct Scsi_Host *host, 
795                          struct NCR_700_Host_Parameters *hostdata,
796                          struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
797 {
798         __u32 resume_offset = dsp, temp = dsp + 8;
799         __u8 pun = 0xff, lun = 0xff;
800
801         if(SCp != NULL) {
802                 pun = SCp->device->id;
803                 lun = SCp->device->lun;
804         }
805
806         switch(hostdata->msgin[2]) {
807         case A_SDTR_MSG:
808                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
809                         struct scsi_target *starget = SCp->device->sdev_target;
810                         __u8 period = hostdata->msgin[3];
811                         __u8 offset = hostdata->msgin[4];
812
813                         if(offset == 0 || period == 0) {
814                                 offset = 0;
815                                 period = 0;
816                         }
817
818                         spi_offset(starget) = offset;
819                         spi_period(starget) = period;
820                         
821                         if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
822                                 spi_display_xfer_agreement(starget);
823                                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
824                         }
825                         
826                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
827                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
828                         
829                         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
830                                        host, SXFER_REG);
831
832                 } else {
833                         /* SDTR message out of the blue, reject it */
834                         printk(KERN_WARNING "scsi%d Unexpected SDTR msg\n",
835                                host->host_no);
836                         hostdata->msgout[0] = A_REJECT_MSG;
837                         dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
838                         script_patch_16(hostdata->script, MessageCount, 1);
839                         /* SendMsgOut returns, so set up the return
840                          * address */
841                         resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
842                 }
843                 break;
844         
845         case A_WDTR_MSG:
846                 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
847                        host->host_no, pun, lun);
848                 hostdata->msgout[0] = A_REJECT_MSG;
849                 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
850                 script_patch_16(hostdata->script, MessageCount, 1);
851                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
852
853                 break;
854
855         default:
856                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
857                        host->host_no, pun, lun,
858                        NCR_700_phase[(dsps & 0xf00) >> 8]);
859                 scsi_print_msg(hostdata->msgin);
860                 printk("\n");
861                 /* just reject it */
862                 hostdata->msgout[0] = A_REJECT_MSG;
863                 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
864                 script_patch_16(hostdata->script, MessageCount, 1);
865                 /* SendMsgOut returns, so set up the return
866                  * address */
867                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
868         }
869         NCR_700_writel(temp, host, TEMP_REG);
870         return resume_offset;
871 }
872
873 STATIC __u32
874 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
875                 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
876 {
877         /* work out where to return to */
878         __u32 temp = dsp + 8, resume_offset = dsp;
879         __u8 pun = 0xff, lun = 0xff;
880
881         if(SCp != NULL) {
882                 pun = SCp->device->id;
883                 lun = SCp->device->lun;
884         }
885
886 #ifdef NCR_700_DEBUG
887         printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
888                NCR_700_phase[(dsps & 0xf00) >> 8]);
889         scsi_print_msg(hostdata->msgin);
890         printk("\n");
891 #endif
892
893         switch(hostdata->msgin[0]) {
894
895         case A_EXTENDED_MSG:
896                 resume_offset =  process_extended_message(host, hostdata, SCp,
897                                                           dsp, dsps);
898                 break;
899
900         case A_REJECT_MSG:
901                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
902                         /* Rejected our sync negotiation attempt */
903                         spi_period(SCp->device->sdev_target) =
904                                 spi_offset(SCp->device->sdev_target) = 0;
905                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
906                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
907                 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
908                         /* rejected our first simple tag message */
909                         printk(KERN_WARNING "scsi%d (%d:%d) Rejected first tag queue attempt, turning off tag queueing\n", host->host_no, pun, lun);
910                         /* we're done negotiating */
911                         NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
912                         hostdata->tag_negotiated &= ~(1<<SCp->device->id);
913                         SCp->device->tagged_supported = 0;
914                         scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
915                 } else {
916                         printk(KERN_WARNING "scsi%d (%d:%d) Unexpected REJECT Message %s\n",
917                                host->host_no, pun, lun,
918                                NCR_700_phase[(dsps & 0xf00) >> 8]);
919                         /* however, just ignore it */
920                 }
921                 break;
922
923         case A_PARITY_ERROR_MSG:
924                 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
925                        pun, lun);
926                 NCR_700_internal_bus_reset(host);
927                 break;
928         case A_SIMPLE_TAG_MSG:
929                 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
930                        pun, lun, hostdata->msgin[1],
931                        NCR_700_phase[(dsps & 0xf00) >> 8]);
932                 /* just ignore it */
933                 break;
934         default:
935                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
936                        host->host_no, pun, lun,
937                        NCR_700_phase[(dsps & 0xf00) >> 8]);
938
939                 scsi_print_msg(hostdata->msgin);
940                 printk("\n");
941                 /* just reject it */
942                 hostdata->msgout[0] = A_REJECT_MSG;
943                 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
944                 script_patch_16(hostdata->script, MessageCount, 1);
945                 /* SendMsgOut returns, so set up the return
946                  * address */
947                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
948
949                 break;
950         }
951         NCR_700_writel(temp, host, TEMP_REG);
952         /* set us up to receive another message */
953         dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
954         return resume_offset;
955 }
956
957 STATIC __u32
958 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
959                          struct Scsi_Host *host,
960                          struct NCR_700_Host_Parameters *hostdata)
961 {
962         __u32 resume_offset = 0;
963         __u8 pun = 0xff, lun=0xff;
964
965         if(SCp != NULL) {
966                 pun = SCp->device->id;
967                 lun = SCp->device->lun;
968         }
969
970         if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
971                 DEBUG(("  COMMAND COMPLETE, status=%02x\n",
972                        hostdata->status[0]));
973                 /* OK, if TCQ still under negotiation, we now know it works */
974                 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
975                         NCR_700_set_tag_neg_state(SCp->device,
976                                                   NCR_700_FINISHED_TAG_NEGOTIATION);
977                         
978                 /* check for contingent allegiance contitions */
979                 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
980                    status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
981                         struct NCR_700_command_slot *slot =
982                                 (struct NCR_700_command_slot *)SCp->host_scribble;
983                         if(SCp->cmnd[0] == REQUEST_SENSE) {
984                                 /* OOPS: bad device, returning another
985                                  * contingent allegiance condition */
986                                 printk(KERN_ERR "scsi%d (%d:%d) broken device is looping in contingent allegiance: ignoring\n", host->host_no, pun, lun);
987                                 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
988                         } else {
989 #ifdef NCR_DEBUG
990                                 scsi_print_command(SCp);
991                                 printk("  cmd %p has status %d, requesting sense\n",
992                                        SCp, hostdata->status[0]);
993 #endif
994                                 /* we can destroy the command here
995                                  * because the contingent allegiance
996                                  * condition will cause a retry which
997                                  * will re-copy the command from the
998                                  * saved data_cmnd.  We also unmap any
999                                  * data associated with the command
1000                                  * here */
1001                                 NCR_700_unmap(hostdata, SCp, slot);
1002
1003                                 SCp->cmnd[0] = REQUEST_SENSE;
1004                                 SCp->cmnd[1] = (SCp->device->lun & 0x7) << 5;
1005                                 SCp->cmnd[2] = 0;
1006                                 SCp->cmnd[3] = 0;
1007                                 SCp->cmnd[4] = sizeof(SCp->sense_buffer);
1008                                 SCp->cmnd[5] = 0;
1009                                 SCp->cmd_len = 6;
1010                                 /* Here's a quiet hack: the
1011                                  * REQUEST_SENSE command is six bytes,
1012                                  * so store a flag indicating that
1013                                  * this was an internal sense request
1014                                  * and the original status at the end
1015                                  * of the command */
1016                                 SCp->cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1017                                 SCp->cmnd[7] = hostdata->status[0];
1018                                 SCp->use_sg = 0;
1019                                 SCp->sc_data_direction = DMA_FROM_DEVICE;
1020                                 dma_sync_single_for_device(hostdata->dev, slot->pCmd,
1021                                                            SCp->cmd_len, DMA_TO_DEVICE);
1022                                 SCp->request_bufflen = sizeof(SCp->sense_buffer);
1023                                 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1024                                 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
1025                                 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1026                                 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1027                                 slot->SG[1].pAddr = 0;
1028                                 slot->resume_offset = hostdata->pScript;
1029                                 dma_cache_sync(slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1030                                 dma_cache_sync(SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1031                                 
1032                                 /* queue the command for reissue */
1033                                 slot->state = NCR_700_SLOT_QUEUED;
1034                                 hostdata->state = NCR_700_HOST_FREE;
1035                                 hostdata->cmd = NULL;
1036                         }
1037                 } else {
1038                         // Currently rely on the mid layer evaluation
1039                         // of the tag queuing capability
1040                         //
1041                         //if(status_byte(hostdata->status[0]) == GOOD &&
1042                         //   SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1043                         //      /* Piggy back the tag queueing support
1044                         //       * on this command */
1045                         //      dma_sync_single_for_cpu(hostdata->dev,
1046                         //                          slot->dma_handle,
1047                         //                          SCp->request_bufflen,
1048                         //                          DMA_FROM_DEVICE);
1049                         //      if(((char *)SCp->request_buffer)[7] & 0x02) {
1050                         //              printk(KERN_INFO "scsi%d: (%d:%d) Enabling Tag Command Queuing\n", host->host_no, pun, lun);
1051                         //              hostdata->tag_negotiated |= (1<<SCp->device->id);
1052                         //              NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1053                         //      } else {
1054                         //              NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1055                         //              hostdata->tag_negotiated &= ~(1<<SCp->device->id);
1056                         //      }
1057                         //}
1058                         NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1059                 }
1060         } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1061                 __u8 i = (dsps & 0xf00) >> 8;
1062
1063                 printk(KERN_ERR "scsi%d: (%d:%d), UNEXPECTED PHASE %s (%s)\n",
1064                        host->host_no, pun, lun,
1065                        NCR_700_phase[i],
1066                        sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1067                 printk(KERN_ERR "         len = %d, cmd =", SCp->cmd_len);
1068                 scsi_print_command(SCp);
1069
1070                 NCR_700_internal_bus_reset(host);
1071         } else if((dsps & 0xfffff000) == A_FATAL) {
1072                 int i = (dsps & 0xfff);
1073
1074                 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1075                        host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1076                 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1077                         printk(KERN_ERR "     msg begins %02x %02x\n",
1078                                hostdata->msgin[0], hostdata->msgin[1]);
1079                 }
1080                 NCR_700_internal_bus_reset(host);
1081         } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1082 #ifdef NCR_700_DEBUG
1083                 __u8 i = (dsps & 0xf00) >> 8;
1084
1085                 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1086                        host->host_no, pun, lun,
1087                        i, NCR_700_phase[i]);
1088 #endif
1089                 save_for_reselection(hostdata, SCp, dsp);
1090
1091         } else if(dsps == A_RESELECTION_IDENTIFIED) {
1092                 __u8 lun;
1093                 struct NCR_700_command_slot *slot;
1094                 __u8 reselection_id = hostdata->reselection_id;
1095                 struct scsi_device *SDp;
1096
1097                 lun = hostdata->msgin[0] & 0x1f;
1098
1099                 hostdata->reselection_id = 0xff;
1100                 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1101                        host->host_no, reselection_id, lun));
1102                 /* clear the reselection indicator */
1103                 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1104                 if(unlikely(SDp == NULL)) {
1105                         printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1106                                host->host_no, reselection_id, lun);
1107                         BUG();
1108                 }
1109                 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1110                         struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1111                         if(unlikely(SCp == NULL)) {
1112                                 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n", 
1113                                        host->host_no, reselection_id, lun, hostdata->msgin[2]);
1114                                 BUG();
1115                         }
1116
1117                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1118                         DEBUG(("53c700: %d:%d:%d, reselection is tag %d, slot %p(%d)\n",
1119                                host->host_no, SDp->id, SDp->lun,
1120                                hostdata->msgin[2], slot, slot->tag));
1121                 } else {
1122                         struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1123                         if(unlikely(SCp == NULL)) {
1124                                 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for untagged cmd\n", 
1125                                        host->host_no, reselection_id, lun);
1126                                 BUG();
1127                         }
1128                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1129                 }
1130
1131                 if(slot == NULL) {
1132                         printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1133                                host->host_no, reselection_id, lun,
1134                                hostdata->msgin[0], hostdata->msgin[1],
1135                                hostdata->msgin[2]);
1136                 } else {
1137                         if(hostdata->state != NCR_700_HOST_BUSY)
1138                                 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1139                                        host->host_no);
1140                         resume_offset = slot->resume_offset;
1141                         hostdata->cmd = slot->cmnd;
1142
1143                         /* re-patch for this command */
1144                         script_patch_32_abs(hostdata->script, CommandAddress, 
1145                                             slot->pCmd);
1146                         script_patch_16(hostdata->script,
1147                                         CommandCount, slot->cmnd->cmd_len);
1148                         script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1149                                             to32bit(&slot->pSG[0].ins));
1150
1151                         /* Note: setting SXFER only works if we're
1152                          * still in the MESSAGE phase, so it is vital
1153                          * that ACK is still asserted when we process
1154                          * the reselection message.  The resume offset
1155                          * should therefore always clear ACK */
1156                         NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1157                                        host, SXFER_REG);
1158                         dma_cache_sync(hostdata->msgin,
1159                                        MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1160                         dma_cache_sync(hostdata->msgout,
1161                                        MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1162                         /* I'm just being paranoid here, the command should
1163                          * already have been flushed from the cache */
1164                         dma_cache_sync(slot->cmnd->cmnd,
1165                                        slot->cmnd->cmd_len, DMA_TO_DEVICE);
1166
1167
1168                         
1169                 }
1170         } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1171
1172                 /* This section is full of debugging code because I've
1173                  * never managed to reach it.  I think what happens is
1174                  * that, because the 700 runs with selection
1175                  * interrupts enabled the whole time that we take a
1176                  * selection interrupt before we manage to get to the
1177                  * reselected script interrupt */
1178
1179                 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1180                 struct NCR_700_command_slot *slot;
1181                 
1182                 /* Take out our own ID */
1183                 reselection_id &= ~(1<<host->this_id);
1184                 
1185                 /* I've never seen this happen, so keep this as a printk rather
1186                  * than a debug */
1187                 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1188                        host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1189
1190                 {
1191                         /* FIXME: DEBUGGING CODE */
1192                         __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1193                         int i;
1194
1195                         for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1196                                 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1197                                    && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1198                                         break;
1199                         }
1200                         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);
1201                         SCp =  hostdata->slots[i].cmnd;
1202                 }
1203
1204                 if(SCp != NULL) {
1205                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1206                         /* change slot from busy to queued to redo command */
1207                         slot->state = NCR_700_SLOT_QUEUED;
1208                 }
1209                 hostdata->cmd = NULL;
1210                 
1211                 if(reselection_id == 0) {
1212                         if(hostdata->reselection_id == 0xff) {
1213                                 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1214                                 return 0;
1215                         } else {
1216                                 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1217                                        host->host_no);
1218                                 reselection_id = hostdata->reselection_id;
1219                         }
1220                 } else {
1221                         
1222                         /* convert to real ID */
1223                         reselection_id = bitmap_to_number(reselection_id);
1224                 }
1225                 hostdata->reselection_id = reselection_id;
1226                 /* just in case we have a stale simple tag message, clear it */
1227                 hostdata->msgin[1] = 0;
1228                 dma_cache_sync(hostdata->msgin,
1229                                MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1230                 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1231                         resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1232                 } else {
1233                         resume_offset = hostdata->pScript + Ent_GetReselectionData;
1234                 }
1235         } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1236                 /* we've just disconnected from the bus, do nothing since
1237                  * a return here will re-run the queued command slot
1238                  * that may have been interrupted by the initial selection */
1239                 DEBUG((" SELECTION COMPLETED\n"));
1240         } else if((dsps & 0xfffff0f0) == A_MSG_IN) { 
1241                 resume_offset = process_message(host, hostdata, SCp,
1242                                                 dsp, dsps);
1243         } else if((dsps &  0xfffff000) == 0) {
1244                 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1245                 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1246                        host->host_no, pun, lun, NCR_700_condition[i],
1247                        NCR_700_phase[j], dsp - hostdata->pScript);
1248                 if(SCp != NULL) {
1249                         scsi_print_command(SCp);
1250
1251                         if(SCp->use_sg) {
1252                                 for(i = 0; i < SCp->use_sg + 1; i++) {
1253                                         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);
1254                                 }
1255                         }
1256                 }              
1257                 NCR_700_internal_bus_reset(host);
1258         } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1259                 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1260                        host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1261                 resume_offset = dsp;
1262         } else {
1263                 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1264                        host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1265                 NCR_700_internal_bus_reset(host);
1266         }
1267         return resume_offset;
1268 }
1269
1270 /* We run the 53c700 with selection interrupts always enabled.  This
1271  * means that the chip may be selected as soon as the bus frees.  On a
1272  * busy bus, this can be before the scripts engine finishes its
1273  * processing.  Therefore, part of the selection processing has to be
1274  * to find out what the scripts engine is doing and complete the
1275  * function if necessary (i.e. process the pending disconnect or save
1276  * the interrupted initial selection */
1277 STATIC inline __u32
1278 process_selection(struct Scsi_Host *host, __u32 dsp)
1279 {
1280         __u8 id = 0;    /* Squash compiler warning */
1281         int count = 0;
1282         __u32 resume_offset = 0;
1283         struct NCR_700_Host_Parameters *hostdata =
1284                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1285         struct scsi_cmnd *SCp = hostdata->cmd;
1286         __u8 sbcl;
1287
1288         for(count = 0; count < 5; count++) {
1289                 id = NCR_700_readb(host, hostdata->chip710 ?
1290                                    CTEST9_REG : SFBR_REG);
1291
1292                 /* Take out our own ID */
1293                 id &= ~(1<<host->this_id);
1294                 if(id != 0) 
1295                         break;
1296                 udelay(5);
1297         }
1298         sbcl = NCR_700_readb(host, SBCL_REG);
1299         if((sbcl & SBCL_IO) == 0) {
1300                 /* mark as having been selected rather than reselected */
1301                 id = 0xff;
1302         } else {
1303                 /* convert to real ID */
1304                 hostdata->reselection_id = id = bitmap_to_number(id);
1305                 DEBUG(("scsi%d:  Reselected by %d\n",
1306                        host->host_no, id));
1307         }
1308         if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1309                 struct NCR_700_command_slot *slot =
1310                         (struct NCR_700_command_slot *)SCp->host_scribble;
1311                 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));
1312                 
1313                 switch(dsp - hostdata->pScript) {
1314                 case Ent_Disconnect1:
1315                 case Ent_Disconnect2:
1316                         save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1317                         break;
1318                 case Ent_Disconnect3:
1319                 case Ent_Disconnect4:
1320                         save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1321                         break;
1322                 case Ent_Disconnect5:
1323                 case Ent_Disconnect6:
1324                         save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1325                         break;
1326                 case Ent_Disconnect7:
1327                 case Ent_Disconnect8:
1328                         save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1329                         break;
1330                 case Ent_Finish1:
1331                 case Ent_Finish2:
1332                         process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1333                         break;
1334                         
1335                 default:
1336                         slot->state = NCR_700_SLOT_QUEUED;
1337                         break;
1338                         }
1339         }
1340         hostdata->state = NCR_700_HOST_BUSY;
1341         hostdata->cmd = NULL;
1342         /* clear any stale simple tag message */
1343         hostdata->msgin[1] = 0;
1344         dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1345                        DMA_BIDIRECTIONAL);
1346
1347         if(id == 0xff) {
1348                 /* Selected as target, Ignore */
1349                 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1350         } else if(hostdata->tag_negotiated & (1<<id)) {
1351                 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1352         } else {
1353                 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1354         }
1355         return resume_offset;
1356 }
1357
1358 static inline void
1359 NCR_700_clear_fifo(struct Scsi_Host *host) {
1360         const struct NCR_700_Host_Parameters *hostdata
1361                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1362         if(hostdata->chip710) {
1363                 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1364         } else {
1365                 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1366         }
1367 }
1368
1369 static inline void
1370 NCR_700_flush_fifo(struct Scsi_Host *host) {
1371         const struct NCR_700_Host_Parameters *hostdata
1372                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1373         if(hostdata->chip710) {
1374                 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1375                 udelay(10);
1376                 NCR_700_writeb(0, host, CTEST8_REG);
1377         } else {
1378                 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1379                 udelay(10);
1380                 NCR_700_writeb(0, host, DFIFO_REG);
1381         }
1382 }
1383
1384
1385 /* The queue lock with interrupts disabled must be held on entry to
1386  * this function */
1387 STATIC int
1388 NCR_700_start_command(struct scsi_cmnd *SCp)
1389 {
1390         struct NCR_700_command_slot *slot =
1391                 (struct NCR_700_command_slot *)SCp->host_scribble;
1392         struct NCR_700_Host_Parameters *hostdata =
1393                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1394         __u16 count = 1;        /* for IDENTIFY message */
1395         
1396         if(hostdata->state != NCR_700_HOST_FREE) {
1397                 /* keep this inside the lock to close the race window where
1398                  * the running command finishes on another CPU while we don't
1399                  * change the state to queued on this one */
1400                 slot->state = NCR_700_SLOT_QUEUED;
1401
1402                 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1403                        SCp->device->host->host_no, slot->cmnd, slot));
1404                 return 0;
1405         }
1406         hostdata->state = NCR_700_HOST_BUSY;
1407         hostdata->cmd = SCp;
1408         slot->state = NCR_700_SLOT_BUSY;
1409         /* keep interrupts disabled until we have the command correctly
1410          * set up so we cannot take a selection interrupt */
1411
1412         hostdata->msgout[0] = NCR_700_identify(SCp->cmnd[0] != REQUEST_SENSE,
1413                                                SCp->device->lun);
1414         /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1415          * if the negotiated transfer parameters still hold, so
1416          * always renegotiate them */
1417         if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE) {
1418                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1419         }
1420
1421         /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1422          * If a contingent allegiance condition exists, the device
1423          * will refuse all tags, so send the request sense as untagged
1424          * */
1425         if((hostdata->tag_negotiated & (1<<SCp->device->id))
1426            && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE)) {
1427                 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1428         }
1429
1430         if(hostdata->fast &&
1431            NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1432                 memcpy(&hostdata->msgout[count], NCR_700_SDTR_msg,
1433                        sizeof(NCR_700_SDTR_msg));
1434                 hostdata->msgout[count+3] = spi_period(SCp->device->sdev_target);
1435                 hostdata->msgout[count+4] = spi_offset(SCp->device->sdev_target);
1436                 count += sizeof(NCR_700_SDTR_msg);
1437                 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1438         }
1439
1440         script_patch_16(hostdata->script, MessageCount, count);
1441
1442
1443         script_patch_ID(hostdata->script,
1444                         Device_ID, 1<<SCp->device->id);
1445
1446         script_patch_32_abs(hostdata->script, CommandAddress, 
1447                             slot->pCmd);
1448         script_patch_16(hostdata->script, CommandCount, SCp->cmd_len);
1449         /* finally plumb the beginning of the SG list into the script
1450          * */
1451         script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1452                             to32bit(&slot->pSG[0].ins));
1453         NCR_700_clear_fifo(SCp->device->host);
1454
1455         if(slot->resume_offset == 0)
1456                 slot->resume_offset = hostdata->pScript;
1457         /* now perform all the writebacks and invalidates */
1458         dma_cache_sync(hostdata->msgout, count, DMA_TO_DEVICE);
1459         dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1460                        DMA_FROM_DEVICE);
1461         dma_cache_sync(SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1462         dma_cache_sync(hostdata->status, 1, DMA_FROM_DEVICE);
1463
1464         /* set the synchronous period/offset */
1465         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1466                        SCp->device->host, SXFER_REG);
1467         NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1468         NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1469
1470         return 1;
1471 }
1472
1473 irqreturn_t
1474 NCR_700_intr(int irq, void *dev_id, struct pt_regs *regs)
1475 {
1476         struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1477         struct NCR_700_Host_Parameters *hostdata =
1478                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1479         __u8 istat;
1480         __u32 resume_offset = 0;
1481         __u8 pun = 0xff, lun = 0xff;
1482         unsigned long flags;
1483         int handled = 0;
1484
1485         /* Use the host lock to serialise acess to the 53c700
1486          * hardware.  Note: In future, we may need to take the queue
1487          * lock to enter the done routines.  When that happens, we
1488          * need to ensure that for this driver, the host lock and the
1489          * queue lock point to the same thing. */
1490         spin_lock_irqsave(host->host_lock, flags);
1491         if((istat = NCR_700_readb(host, ISTAT_REG))
1492               & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1493                 __u32 dsps;
1494                 __u8 sstat0 = 0, dstat = 0;
1495                 __u32 dsp;
1496                 struct scsi_cmnd *SCp = hostdata->cmd;
1497                 enum NCR_700_Host_State state;
1498
1499                 handled = 1;
1500                 state = hostdata->state;
1501                 SCp = hostdata->cmd;
1502
1503                 if(istat & SCSI_INT_PENDING) {
1504                         udelay(10);
1505
1506                         sstat0 = NCR_700_readb(host, SSTAT0_REG);
1507                 }
1508
1509                 if(istat & DMA_INT_PENDING) {
1510                         udelay(10);
1511
1512                         dstat = NCR_700_readb(host, DSTAT_REG);
1513                 }
1514
1515                 dsps = NCR_700_readl(host, DSPS_REG);
1516                 dsp = NCR_700_readl(host, DSP_REG);
1517
1518                 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1519                        host->host_no, istat, sstat0, dstat,
1520                        (dsp - (__u32)(hostdata->pScript))/4,
1521                        dsp, dsps));
1522
1523                 if(SCp != NULL) {
1524                         pun = SCp->device->id;
1525                         lun = SCp->device->lun;
1526                 }
1527
1528                 if(sstat0 & SCSI_RESET_DETECTED) {
1529                         struct scsi_device *SDp;
1530                         int i;
1531
1532                         hostdata->state = NCR_700_HOST_BUSY;
1533
1534                         printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1535                                host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1536
1537                         scsi_report_bus_reset(host, 0);
1538
1539                         /* clear all the negotiated parameters */
1540                         __shost_for_each_device(SDp, host)
1541                                 SDp->hostdata = NULL;
1542                         
1543                         /* clear all the slots and their pending commands */
1544                         for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1545                                 struct scsi_cmnd *SCp;
1546                                 struct NCR_700_command_slot *slot =
1547                                         &hostdata->slots[i];
1548
1549                                 if(slot->state == NCR_700_SLOT_FREE)
1550                                         continue;
1551                                 
1552                                 SCp = slot->cmnd;
1553                                 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1554                                        slot, SCp);
1555                                 free_slot(slot, hostdata);
1556                                 SCp->host_scribble = NULL;
1557                                 NCR_700_set_depth(SCp->device, 0);
1558                                 /* NOTE: deadlock potential here: we
1559                                  * rely on mid-layer guarantees that
1560                                  * scsi_done won't try to issue the
1561                                  * command again otherwise we'll
1562                                  * deadlock on the
1563                                  * hostdata->state_lock */
1564                                 SCp->result = DID_RESET << 16;
1565                                 SCp->scsi_done(SCp);
1566                         }
1567                         mdelay(25);
1568                         NCR_700_chip_setup(host);
1569
1570                         hostdata->state = NCR_700_HOST_FREE;
1571                         hostdata->cmd = NULL;
1572                         /* signal back if this was an eh induced reset */
1573                         if(hostdata->eh_complete != NULL)
1574                                 complete(hostdata->eh_complete);
1575                         goto out_unlock;
1576                 } else if(sstat0 & SELECTION_TIMEOUT) {
1577                         DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1578                                host->host_no, pun, lun));
1579                         NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1580                 } else if(sstat0 & PHASE_MISMATCH) {
1581                         struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1582                                 (struct NCR_700_command_slot *)SCp->host_scribble;
1583
1584                         if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1585                                 /* It wants to reply to some part of
1586                                  * our message */
1587 #ifdef NCR_700_DEBUG
1588                                 __u32 temp = NCR_700_readl(host, TEMP_REG);
1589                                 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1590                                 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)));
1591 #endif
1592                                 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1593                         } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1594                                   dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1595                                 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1596                                 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1597                                 int residual = NCR_700_data_residual(host);
1598                                 int i;
1599 #ifdef NCR_700_DEBUG
1600                                 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1601
1602                                 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1603                                        host->host_no, pun, lun,
1604                                        SGcount, data_transfer);
1605                                 scsi_print_command(SCp);
1606                                 if(residual) {
1607                                         printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1608                                        host->host_no, pun, lun,
1609                                        SGcount, data_transfer, residual);
1610                                 }
1611 #endif
1612                                 data_transfer += residual;
1613
1614                                 if(data_transfer != 0) {
1615                                         int count; 
1616                                         __u32 pAddr;
1617
1618                                         SGcount--;
1619
1620                                         count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1621                                         DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1622                                         slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1623                                         slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1624                                         pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1625                                         pAddr += (count - data_transfer);
1626 #ifdef NCR_700_DEBUG
1627                                         if(pAddr != naddr) {
1628                                                 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);
1629                                         }
1630 #endif
1631                                         slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1632                                 }
1633                                 /* set the executed moves to nops */
1634                                 for(i=0; i<SGcount; i++) {
1635                                         slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1636                                         slot->SG[i].pAddr = 0;
1637                                 }
1638                                 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1639                                 /* and pretend we disconnected after
1640                                  * the command phase */
1641                                 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1642                                 /* make sure all the data is flushed */
1643                                 NCR_700_flush_fifo(host);
1644                         } else {
1645                                 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1646                                 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1647                                        host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1648                                 NCR_700_internal_bus_reset(host);
1649                         }
1650
1651                 } else if(sstat0 & SCSI_GROSS_ERROR) {
1652                         printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1653                                host->host_no, pun, lun);
1654                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1655                 } else if(sstat0 & PARITY_ERROR) {
1656                         printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1657                                host->host_no, pun, lun);
1658                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1659                 } else if(dstat & SCRIPT_INT_RECEIVED) {
1660                         DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1661                                host->host_no, pun, lun));
1662                         resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1663                 } else if(dstat & (ILGL_INST_DETECTED)) {
1664                         printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1665                                "         Please email James.Bottomley@HansenPartnership.com with the details\n",
1666                                host->host_no, pun, lun,
1667                                dsp, dsp - hostdata->pScript);
1668                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1669                 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1670                         printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1671                                host->host_no, pun, lun, dstat);
1672                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1673                 }
1674
1675                 
1676                 /* NOTE: selection interrupt processing MUST occur
1677                  * after script interrupt processing to correctly cope
1678                  * with the case where we process a disconnect and
1679                  * then get reselected before we process the
1680                  * disconnection */
1681                 if(sstat0 & SELECTED) {
1682                         /* FIXME: It currently takes at least FOUR
1683                          * interrupts to complete a command that
1684                          * disconnects: one for the disconnect, one
1685                          * for the reselection, one to get the
1686                          * reselection data and one to complete the
1687                          * command.  If we guess the reselected
1688                          * command here and prepare it, we only need
1689                          * to get a reselection data interrupt if we
1690                          * guessed wrongly.  Since the interrupt
1691                          * overhead is much greater than the command
1692                          * setup, this would be an efficient
1693                          * optimisation particularly as we probably
1694                          * only have one outstanding command on a
1695                          * target most of the time */
1696
1697                         resume_offset = process_selection(host, dsp);
1698
1699                 }
1700
1701         }
1702
1703         if(resume_offset) {
1704                 if(hostdata->state != NCR_700_HOST_BUSY) {
1705                         printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1706                                host->host_no, resume_offset, resume_offset - hostdata->pScript);
1707                         hostdata->state = NCR_700_HOST_BUSY;
1708                 }
1709
1710                 DEBUG(("Attempting to resume at %x\n", resume_offset));
1711                 NCR_700_clear_fifo(host);
1712                 NCR_700_writel(resume_offset, host, DSP_REG);
1713         } 
1714         /* There is probably a technical no-no about this: If we're a
1715          * shared interrupt and we got this interrupt because the
1716          * other device needs servicing not us, we're still going to
1717          * check our queued commands here---of course, there shouldn't
1718          * be any outstanding.... */
1719         if(hostdata->state == NCR_700_HOST_FREE) {
1720                 int i;
1721
1722                 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1723                         /* fairness: always run the queue from the last
1724                          * position we left off */
1725                         int j = (i + hostdata->saved_slot_position)
1726                                 % NCR_700_COMMAND_SLOTS_PER_HOST;
1727                         
1728                         if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1729                                 continue;
1730                         if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1731                                 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1732                                        host->host_no, &hostdata->slots[j],
1733                                        hostdata->slots[j].cmnd));
1734                                 hostdata->saved_slot_position = j + 1;
1735                         }
1736
1737                         break;
1738                 }
1739         }
1740  out_unlock:
1741         spin_unlock_irqrestore(host->host_lock, flags);
1742         return IRQ_RETVAL(handled);
1743 }
1744
1745 STATIC int
1746 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1747 {
1748         struct NCR_700_Host_Parameters *hostdata = 
1749                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1750         __u32 move_ins;
1751         enum dma_data_direction direction;
1752         struct NCR_700_command_slot *slot;
1753
1754         if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1755                 /* We're over our allocation, this should never happen
1756                  * since we report the max allocation to the mid layer */
1757                 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1758                 return 1;
1759         }
1760         /* check for untagged commands.  We cannot have any outstanding
1761          * commands if we accept them.  Commands could be untagged because:
1762          *
1763          * - The tag negotiated bitmap is clear
1764          * - The blk layer sent and untagged command
1765          */
1766         if(NCR_700_get_depth(SCp->device) != 0
1767            && (!(hostdata->tag_negotiated & (1<<SCp->device->id))
1768                || !blk_rq_tagged(SCp->request))) {
1769                 DEBUG((KERN_ERR "scsi%d (%d:%d) has non zero depth %d\n",
1770                        SCp->device->host->host_no, SCp->device->id, SCp->device->lun,
1771                        NCR_700_get_depth(SCp->device)));
1772                 return SCSI_MLQUEUE_DEVICE_BUSY;
1773         }
1774         if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1775                 DEBUG((KERN_ERR "scsi%d (%d:%d) has max tag depth %d\n",
1776                        SCp->device->host->host_no, SCp->device->id, SCp->device->lun,
1777                        NCR_700_get_depth(SCp->device)));
1778                 return SCSI_MLQUEUE_DEVICE_BUSY;
1779         }
1780         NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1781
1782         /* begin the command here */
1783         /* no need to check for NULL, test for command_slot_count above
1784          * ensures a slot is free */
1785         slot = find_empty_slot(hostdata);
1786
1787         slot->cmnd = SCp;
1788
1789         SCp->scsi_done = done;
1790         SCp->host_scribble = (unsigned char *)slot;
1791         SCp->SCp.ptr = NULL;
1792         SCp->SCp.buffer = NULL;
1793
1794 #ifdef NCR_700_DEBUG
1795         printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1796         scsi_print_command(SCp);
1797 #endif
1798         if(blk_rq_tagged(SCp->request)
1799            && (hostdata->tag_negotiated &(1<<SCp->device->id)) == 0
1800            && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1801                 printk(KERN_ERR "scsi%d: (%d:%d) Enabling Tag Command Queuing\n", SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
1802                 hostdata->tag_negotiated |= (1<<SCp->device->id);
1803                 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1804         }
1805
1806         /* here we may have to process an untagged command.  The gate
1807          * above ensures that this will be the only one outstanding,
1808          * so clear the tag negotiated bit.
1809          *
1810          * FIXME: This will royally screw up on multiple LUN devices
1811          * */
1812         if(!blk_rq_tagged(SCp->request)
1813            && (hostdata->tag_negotiated &(1<<SCp->device->id))) {
1814                 printk(KERN_INFO "scsi%d: (%d:%d) Disabling Tag Command Queuing\n", SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
1815                 hostdata->tag_negotiated &= ~(1<<SCp->device->id);
1816         }
1817
1818         if((hostdata->tag_negotiated &(1<<SCp->device->id))
1819            && scsi_get_tag_type(SCp->device)) {
1820                 slot->tag = SCp->request->tag;
1821                 DEBUG(("53c700 %d:%d:%d, sending out tag %d, slot %p\n",
1822                        SCp->device->host->host_no, SCp->device->id, SCp->device->lun, slot->tag,
1823                        slot));
1824         } else {
1825                 slot->tag = SCSI_NO_TAG;
1826                 /* must populate current_cmnd for scsi_find_tag to work */
1827                 SCp->device->current_cmnd = SCp;
1828         }
1829         /* sanity check: some of the commands generated by the mid-layer
1830          * have an eccentric idea of their sc_data_direction */
1831         if(!SCp->use_sg && !SCp->request_bufflen 
1832            && SCp->sc_data_direction != DMA_NONE) {
1833 #ifdef NCR_700_DEBUG
1834                 printk("53c700: Command");
1835                 scsi_print_command(SCp);
1836                 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1837 #endif
1838                 SCp->sc_data_direction = DMA_NONE;
1839         }
1840
1841         switch (SCp->cmnd[0]) {
1842         case REQUEST_SENSE:
1843                 /* clear the internal sense magic */
1844                 SCp->cmnd[6] = 0;
1845                 /* fall through */
1846         default:
1847                 /* OK, get it from the command */
1848                 switch(SCp->sc_data_direction) {
1849                 case DMA_BIDIRECTIONAL:
1850                 default:
1851                         printk(KERN_ERR "53c700: Unknown command for data direction ");
1852                         scsi_print_command(SCp);
1853                         
1854                         move_ins = 0;
1855                         break;
1856                 case DMA_NONE:
1857                         move_ins = 0;
1858                         break;
1859                 case DMA_FROM_DEVICE:
1860                         move_ins = SCRIPT_MOVE_DATA_IN;
1861                         break;
1862                 case DMA_TO_DEVICE:
1863                         move_ins = SCRIPT_MOVE_DATA_OUT;
1864                         break;
1865                 }
1866         }
1867
1868         /* now build the scatter gather list */
1869         direction = SCp->sc_data_direction;
1870         if(move_ins != 0) {
1871                 int i;
1872                 int sg_count;
1873                 dma_addr_t vPtr = 0;
1874                 __u32 count = 0;
1875
1876                 if(SCp->use_sg) {
1877                         sg_count = dma_map_sg(hostdata->dev, SCp->buffer,
1878                                               SCp->use_sg, direction);
1879                 } else {
1880                         vPtr = dma_map_single(hostdata->dev,
1881                                               SCp->request_buffer, 
1882                                               SCp->request_bufflen,
1883                                               direction);
1884                         count = SCp->request_bufflen;
1885                         slot->dma_handle = vPtr;
1886                         sg_count = 1;
1887                 }
1888                         
1889
1890                 for(i = 0; i < sg_count; i++) {
1891
1892                         if(SCp->use_sg) {
1893                                 struct scatterlist *sg = SCp->buffer;
1894
1895                                 vPtr = sg_dma_address(&sg[i]);
1896                                 count = sg_dma_len(&sg[i]);
1897                         }
1898
1899                         slot->SG[i].ins = bS_to_host(move_ins | count);
1900                         DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1901                                i, count, slot->SG[i].ins, (unsigned long)vPtr));
1902                         slot->SG[i].pAddr = bS_to_host(vPtr);
1903                 }
1904                 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1905                 slot->SG[i].pAddr = 0;
1906                 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1907                 DEBUG((" SETTING %08lx to %x\n",
1908                        (&slot->pSG[i].ins), 
1909                        slot->SG[i].ins));
1910         }
1911         slot->resume_offset = 0;
1912         slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1913                                     sizeof(SCp->cmnd), DMA_TO_DEVICE);
1914         NCR_700_start_command(SCp);
1915         return 0;
1916 }
1917
1918 STATIC int
1919 NCR_700_abort(struct scsi_cmnd * SCp)
1920 {
1921         struct NCR_700_command_slot *slot;
1922
1923         printk(KERN_INFO "scsi%d (%d:%d) New error handler wants to abort command\n\t",
1924                SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
1925         scsi_print_command(SCp);
1926
1927         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1928
1929         if(slot == NULL)
1930                 /* no outstanding command to abort */
1931                 return SUCCESS;
1932         if(SCp->cmnd[0] == TEST_UNIT_READY) {
1933                 /* FIXME: This is because of a problem in the new
1934                  * error handler.  When it is in error recovery, it
1935                  * will send a TUR to a device it thinks may still be
1936                  * showing a problem.  If the TUR isn't responded to,
1937                  * it will abort it and mark the device off line.
1938                  * Unfortunately, it does no other error recovery, so
1939                  * this would leave us with an outstanding command
1940                  * occupying a slot.  Rather than allow this to
1941                  * happen, we issue a bus reset to force all
1942                  * outstanding commands to terminate here. */
1943                 NCR_700_internal_bus_reset(SCp->device->host);
1944                 /* still drop through and return failed */
1945         }
1946         return FAILED;
1947
1948 }
1949
1950 STATIC int
1951 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1952 {
1953         DECLARE_COMPLETION(complete);
1954         struct NCR_700_Host_Parameters *hostdata = 
1955                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1956
1957         printk(KERN_INFO "scsi%d (%d:%d) New error handler wants BUS reset, cmd %p\n\t",
1958                SCp->device->host->host_no, SCp->device->id, SCp->device->lun, SCp);
1959         scsi_print_command(SCp);
1960
1961         /* In theory, eh_complete should always be null because the
1962          * eh is single threaded, but just in case we're handling a
1963          * reset via sg or something */
1964         spin_lock_irq(SCp->device->host->host_lock);
1965         while (hostdata->eh_complete != NULL) {
1966                 spin_unlock_irq(SCp->device->host->host_lock);
1967                 msleep_interruptible(100);
1968                 spin_lock_irq(SCp->device->host->host_lock);
1969         }
1970
1971         hostdata->eh_complete = &complete;
1972         NCR_700_internal_bus_reset(SCp->device->host);
1973
1974         spin_unlock_irq(SCp->device->host->host_lock);
1975         wait_for_completion(&complete);
1976         spin_lock_irq(SCp->device->host->host_lock);
1977
1978         hostdata->eh_complete = NULL;
1979         /* Revalidate the transport parameters of the failing device */
1980         if(hostdata->fast)
1981                 spi_schedule_dv_device(SCp->device);
1982
1983         spin_unlock_irq(SCp->device->host->host_lock);
1984         return SUCCESS;
1985 }
1986
1987 STATIC int
1988 NCR_700_host_reset(struct scsi_cmnd * SCp)
1989 {
1990         printk(KERN_INFO "scsi%d (%d:%d) New error handler wants HOST reset\n\t",
1991                SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
1992         scsi_print_command(SCp);
1993
1994         spin_lock_irq(SCp->device->host->host_lock);
1995
1996         NCR_700_internal_bus_reset(SCp->device->host);
1997         NCR_700_chip_reset(SCp->device->host);
1998
1999         spin_unlock_irq(SCp->device->host->host_lock);
2000
2001         return SUCCESS;
2002 }
2003
2004 STATIC void
2005 NCR_700_set_period(struct scsi_target *STp, int period)
2006 {
2007         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2008         struct NCR_700_Host_Parameters *hostdata = 
2009                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2010         
2011         if(!hostdata->fast)
2012                 return;
2013
2014         if(period < hostdata->min_period)
2015                 period = hostdata->min_period;
2016
2017         spi_period(STp) = period;
2018         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2019                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2020         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2021 }
2022
2023 STATIC void
2024 NCR_700_set_offset(struct scsi_target *STp, int offset)
2025 {
2026         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2027         struct NCR_700_Host_Parameters *hostdata = 
2028                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2029         int max_offset = hostdata->chip710
2030                 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2031         
2032         if(!hostdata->fast)
2033                 return;
2034
2035         if(offset > max_offset)
2036                 offset = max_offset;
2037
2038         /* if we're currently async, make sure the period is reasonable */
2039         if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2040                                     spi_period(STp) > 0xff))
2041                 spi_period(STp) = hostdata->min_period;
2042
2043         spi_offset(STp) = offset;
2044         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2045                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2046         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2047 }
2048
2049
2050
2051 STATIC int
2052 NCR_700_slave_configure(struct scsi_device *SDp)
2053 {
2054         struct NCR_700_Host_Parameters *hostdata = 
2055                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2056
2057         /* to do here: allocate memory; build a queue_full list */
2058         if(SDp->tagged_supported) {
2059                 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2060                 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2061                 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2062         } else {
2063                 /* initialise to default depth */
2064                 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2065         }
2066         if(hostdata->fast) {
2067                 /* Find the correct offset and period via domain validation */
2068                 if (!spi_initial_dv(SDp->sdev_target))
2069                         spi_dv_device(SDp);
2070         } else {
2071                 spi_offset(SDp->sdev_target) = 0;
2072                 spi_period(SDp->sdev_target) = 0;
2073         }
2074         return 0;
2075 }
2076
2077 STATIC void
2078 NCR_700_slave_destroy(struct scsi_device *SDp)
2079 {
2080         /* to do here: deallocate memory */
2081 }
2082
2083 static int
2084 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2085 {
2086         if (depth > NCR_700_MAX_TAGS)
2087                 depth = NCR_700_MAX_TAGS;
2088
2089         scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2090         return depth;
2091 }
2092
2093 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2094 {
2095         int change_tag = ((tag_type ==0 &&  scsi_get_tag_type(SDp) != 0)
2096                           || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2097         struct NCR_700_Host_Parameters *hostdata = 
2098                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2099
2100         scsi_set_tag_type(SDp, tag_type);
2101
2102         /* We have a global (per target) flag to track whether TCQ is
2103          * enabled, so we'll be turning it off for the entire target here.
2104          * our tag algorithm will fail if we mix tagged and untagged commands,
2105          * so quiesce the device before doing this */
2106         if (change_tag)
2107                 scsi_target_quiesce(SDp->sdev_target);
2108
2109         if (!tag_type) {
2110                 /* shift back to the default unqueued number of commands
2111                  * (the user can still raise this) */
2112                 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2113                 hostdata->tag_negotiated &= ~(1 << SDp->id);
2114         } else {
2115                 /* Here, we cleared the negotiation flag above, so this
2116                  * will force the driver to renegotiate */
2117                 scsi_activate_tcq(SDp, SDp->queue_depth);
2118                 if (change_tag)
2119                         NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2120         }
2121         if (change_tag)
2122                 scsi_target_resume(SDp->sdev_target);
2123
2124         return tag_type;
2125 }
2126
2127 static ssize_t
2128 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2129 {
2130         struct scsi_device *SDp = to_scsi_device(dev);
2131
2132         return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2133 }
2134
2135 static struct device_attribute NCR_700_active_tags_attr = {
2136         .attr = {
2137                 .name =         "active_tags",
2138                 .mode =         S_IRUGO,
2139         },
2140         .show = NCR_700_show_active_tags,
2141 };
2142
2143 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2144         &NCR_700_active_tags_attr,
2145         NULL,
2146 };
2147
2148 EXPORT_SYMBOL(NCR_700_detect);
2149 EXPORT_SYMBOL(NCR_700_release);
2150 EXPORT_SYMBOL(NCR_700_intr);
2151
2152 static struct spi_function_template NCR_700_transport_functions =  {
2153         .set_period     = NCR_700_set_period,
2154         .show_period    = 1,
2155         .set_offset     = NCR_700_set_offset,
2156         .show_offset    = 1,
2157 };
2158
2159 static int __init NCR_700_init(void)
2160 {
2161         NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2162         if(!NCR_700_transport_template)
2163                 return -ENODEV;
2164         return 0;
2165 }
2166
2167 static void __exit NCR_700_exit(void)
2168 {
2169         spi_release_transport(NCR_700_transport_template);
2170 }
2171
2172 module_init(NCR_700_init);
2173 module_exit(NCR_700_exit);
2174