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clocksource: armada-370-xp: Get reference fixed-clock by name
[linux-2.6.git] / drivers / scsi / 53c700.c
bloba3adfb4357f54fab69a12fad742e18213328cb50
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/kernel.h>
118 #include <linux/types.h>
119 #include <linux/string.h>
120 #include <linux/slab.h>
121 #include <linux/ioport.h>
122 #include <linux/delay.h>
123 #include <linux/spinlock.h>
124 #include <linux/completion.h>
125 #include <linux/init.h>
126 #include <linux/proc_fs.h>
127 #include <linux/blkdev.h>
128 #include <linux/module.h>
129 #include <linux/interrupt.h>
130 #include <linux/device.h>
131 #include <asm/dma.h>
132 #include <asm/io.h>
133 #include <asm/pgtable.h>
134 #include <asm/byteorder.h>
135
136 #include <scsi/scsi.h>
137 #include <scsi/scsi_cmnd.h>
138 #include <scsi/scsi_dbg.h>
139 #include <scsi/scsi_eh.h>
140 #include <scsi/scsi_host.h>
141 #include <scsi/scsi_tcq.h>
142 #include <scsi/scsi_transport.h>
143 #include <scsi/scsi_transport_spi.h>
144
145 #include "53c700.h"
146
147 /* NOTE: For 64 bit drivers there are points in the code where we use
148 * a non dereferenceable pointer to point to a structure in dma-able
149 * memory (which is 32 bits) so that we can use all of the structure
150 * operations but take the address at the end. This macro allows us
151 * to truncate the 64 bit pointer down to 32 bits without the compiler
152 * complaining */
153 #define to32bit(x) ((__u32)((unsigned long)(x)))
154
155 #ifdef NCR_700_DEBUG
156 #define STATIC
157 #else
158 #define STATIC static
159 #endif
160
161 MODULE_AUTHOR("James Bottomley");
162 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
163 MODULE_LICENSE("GPL");
164
165 /* This is the script */
166 #include "53c700_d.h"
167
168
169 STATIC int NCR_700_queuecommand(struct Scsi_Host *h, struct scsi_cmnd *);
170 STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
171 STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
172 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
173 STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
174 STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
175 STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt);
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, int reason);
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 /* This translates the SDTR message offset and period to a value
241 * which can be loaded into the SXFER_REG.
242 *
243 * NOTE: According to SCSI-2, the true transfer period (in ns) is
244 * actually four times this period value */
245 static inline __u8
246 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
247 __u8 offset, __u8 period)
248 {
249 int XFERP;
250
251 __u8 min_xferp = (hostdata->chip710
252 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
253 __u8 max_offset = (hostdata->chip710
254 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
255
256 if(offset == 0)
257 return 0;
258
259 if(period < hostdata->min_period) {
260 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
261 period = hostdata->min_period;
262 }
263 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
264 if(offset > max_offset) {
265 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
266 offset, max_offset);
267 offset = max_offset;
268 }
269 if(XFERP < min_xferp) {
270 XFERP = min_xferp;
271 }
272 return (offset & 0x0f) | (XFERP & 0x07)<<4;
273 }
274
275 static inline __u8
276 NCR_700_get_SXFER(struct scsi_device *SDp)
277 {
278 struct NCR_700_Host_Parameters *hostdata =
279 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
280
281 return NCR_700_offset_period_to_sxfer(hostdata,
282 spi_offset(SDp->sdev_target),
283 spi_period(SDp->sdev_target));
284 }
285
286 struct Scsi_Host *
287 NCR_700_detect(struct scsi_host_template *tpnt,
288 struct NCR_700_Host_Parameters *hostdata, struct device *dev)
289 {
290 dma_addr_t pScript, pSlots;
291 __u8 *memory;
292 __u32 *script;
293 struct Scsi_Host *host;
294 static int banner = 0;
295 int j;
296
297 if(tpnt->sdev_attrs == NULL)
298 tpnt->sdev_attrs = NCR_700_dev_attrs;
299
300 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
301 &pScript, GFP_KERNEL);
302 if(memory == NULL) {
303 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
304 return NULL;
305 }
306
307 script = (__u32 *)memory;
308 hostdata->msgin = memory + MSGIN_OFFSET;
309 hostdata->msgout = memory + MSGOUT_OFFSET;
310 hostdata->status = memory + STATUS_OFFSET;
311 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
312 hostdata->dev = dev;
313
314 pSlots = pScript + SLOTS_OFFSET;
315
316 /* Fill in the missing routines from the host template */
317 tpnt->queuecommand = NCR_700_queuecommand;
318 tpnt->eh_abort_handler = NCR_700_abort;
319 tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
320 tpnt->eh_host_reset_handler = NCR_700_host_reset;
321 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
322 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
323 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
324 tpnt->use_clustering = ENABLE_CLUSTERING;
325 tpnt->slave_configure = NCR_700_slave_configure;
326 tpnt->slave_destroy = NCR_700_slave_destroy;
327 tpnt->slave_alloc = NCR_700_slave_alloc;
328 tpnt->change_queue_depth = NCR_700_change_queue_depth;
329 tpnt->change_queue_type = NCR_700_change_queue_type;
330
331 if(tpnt->name == NULL)
332 tpnt->name = "53c700";
333 if(tpnt->proc_name == NULL)
334 tpnt->proc_name = "53c700";
335
336 host = scsi_host_alloc(tpnt, 4);
337 if (!host)
338 return NULL;
339 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
340 * NCR_700_COMMAND_SLOTS_PER_HOST);
341 for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
342 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
343 - (unsigned long)&hostdata->slots[0].SG[0]);
344 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
345 if(j == 0)
346 hostdata->free_list = &hostdata->slots[j];
347 else
348 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
349 hostdata->slots[j].state = NCR_700_SLOT_FREE;
350 }
351
352 for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
353 script[j] = bS_to_host(SCRIPT[j]);
354
355 /* adjust all labels to be bus physical */
356 for (j = 0; j < PATCHES; j++)
357 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
358 /* now patch up fixed addresses. */
359 script_patch_32(hostdata->dev, script, MessageLocation,
360 pScript + MSGOUT_OFFSET);
361 script_patch_32(hostdata->dev, script, StatusAddress,
362 pScript + STATUS_OFFSET);
363 script_patch_32(hostdata->dev, script, ReceiveMsgAddress,
364 pScript + MSGIN_OFFSET);
365
366 hostdata->script = script;
367 hostdata->pScript = pScript;
368 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
369 hostdata->state = NCR_700_HOST_FREE;
370 hostdata->cmd = NULL;
371 host->max_id = 8;
372 host->max_lun = NCR_700_MAX_LUNS;
373 BUG_ON(NCR_700_transport_template == NULL);
374 host->transportt = NCR_700_transport_template;
375 host->unique_id = (unsigned long)hostdata->base;
376 hostdata->eh_complete = NULL;
377 host->hostdata[0] = (unsigned long)hostdata;
378 /* kick the chip */
379 NCR_700_writeb(0xff, host, CTEST9_REG);
380 if (hostdata->chip710)
381 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
382 else
383 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
384 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
385 if (banner == 0) {
386 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
387 banner = 1;
388 }
389 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
390 hostdata->chip710 ? "53c710" :
391 (hostdata->fast ? "53c700-66" : "53c700"),
392 hostdata->rev, hostdata->differential ?
393 "(Differential)" : "");
394 /* reset the chip */
395 NCR_700_chip_reset(host);
396
397 if (scsi_add_host(host, dev)) {
398 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
399 scsi_host_put(host);
400 return NULL;
401 }
402
403 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
404 SPI_SIGNAL_SE;
405
406 return host;
407 }
408
409 int
410 NCR_700_release(struct Scsi_Host *host)
411 {
412 struct NCR_700_Host_Parameters *hostdata =
413 (struct NCR_700_Host_Parameters *)host->hostdata[0];
414
415 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
416 hostdata->script, hostdata->pScript);
417 return 1;
418 }
419
420 static inline __u8
421 NCR_700_identify(int can_disconnect, __u8 lun)
422 {
423 return IDENTIFY_BASE |
424 ((can_disconnect) ? 0x40 : 0) |
425 (lun & NCR_700_LUN_MASK);
426 }
427
428 /*
429 * Function : static int data_residual (Scsi_Host *host)
430 *
431 * Purpose : return residual data count of what's in the chip. If you
432 * really want to know what this function is doing, it's almost a
433 * direct transcription of the algorithm described in the 53c710
434 * guide, except that the DBC and DFIFO registers are only 6 bits
435 * wide on a 53c700.
436 *
437 * Inputs : host - SCSI host */
438 static inline int
439 NCR_700_data_residual (struct Scsi_Host *host) {
440 struct NCR_700_Host_Parameters *hostdata =
441 (struct NCR_700_Host_Parameters *)host->hostdata[0];
442 int count, synchronous = 0;
443 unsigned int ddir;
444
445 if(hostdata->chip710) {
446 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
447 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
448 } else {
449 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
450 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
451 }
452
453 if(hostdata->fast)
454 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
455
456 /* get the data direction */
457 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
458
459 if (ddir) {
460 /* Receive */
461 if (synchronous)
462 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
463 else
464 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
465 ++count;
466 } else {
467 /* Send */
468 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
469 if (sstat & SODL_REG_FULL)
470 ++count;
471 if (synchronous && (sstat & SODR_REG_FULL))
472 ++count;
473 }
474 #ifdef NCR_700_DEBUG
475 if(count)
476 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
477 #endif
478 return count;
479 }
480
481 /* print out the SCSI wires and corresponding phase from the SBCL register
482 * in the chip */
483 static inline char *
484 sbcl_to_string(__u8 sbcl)
485 {
486 int i;
487 static char ret[256];
488
489 ret[0]='\0';
490 for(i=0; i<8; i++) {
491 if((1<<i) & sbcl)
492 strcat(ret, NCR_700_SBCL_bits[i]);
493 }
494 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
495 return ret;
496 }
497
498 static inline __u8
499 bitmap_to_number(__u8 bitmap)
500 {
501 __u8 i;
502
503 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
504 ;
505 return i;
506 }
507
508 /* Pull a slot off the free list */
509 STATIC struct NCR_700_command_slot *
510 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
511 {
512 struct NCR_700_command_slot *slot = hostdata->free_list;
513
514 if(slot == NULL) {
515 /* sanity check */
516 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
517 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
518 return NULL;
519 }
520
521 if(slot->state != NCR_700_SLOT_FREE)
522 /* should panic! */
523 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
524
525
526 hostdata->free_list = slot->ITL_forw;
527 slot->ITL_forw = NULL;
528
529
530 /* NOTE: set the state to busy here, not queued, since this
531 * indicates the slot is in use and cannot be run by the IRQ
532 * finish routine. If we cannot queue the command when it
533 * is properly build, we then change to NCR_700_SLOT_QUEUED */
534 slot->state = NCR_700_SLOT_BUSY;
535 slot->flags = 0;
536 hostdata->command_slot_count++;
537
538 return slot;
539 }
540
541 STATIC void
542 free_slot(struct NCR_700_command_slot *slot,
543 struct NCR_700_Host_Parameters *hostdata)
544 {
545 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
546 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
547 }
548 if(slot->state == NCR_700_SLOT_FREE) {
549 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
550 }
551
552 slot->resume_offset = 0;
553 slot->cmnd = NULL;
554 slot->state = NCR_700_SLOT_FREE;
555 slot->ITL_forw = hostdata->free_list;
556 hostdata->free_list = slot;
557 hostdata->command_slot_count--;
558 }
559
560
561 /* This routine really does very little. The command is indexed on
562 the ITL and (if tagged) the ITLQ lists in _queuecommand */
563 STATIC void
564 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
565 struct scsi_cmnd *SCp, __u32 dsp)
566 {
567 /* Its just possible that this gets executed twice */
568 if(SCp != NULL) {
569 struct NCR_700_command_slot *slot =
570 (struct NCR_700_command_slot *)SCp->host_scribble;
571
572 slot->resume_offset = dsp;
573 }
574 hostdata->state = NCR_700_HOST_FREE;
575 hostdata->cmd = NULL;
576 }
577
578 STATIC inline void
579 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
580 struct NCR_700_command_slot *slot)
581 {
582 if(SCp->sc_data_direction != DMA_NONE &&
583 SCp->sc_data_direction != DMA_BIDIRECTIONAL)
584 scsi_dma_unmap(SCp);
585 }
586
587 STATIC inline void
588 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
589 struct scsi_cmnd *SCp, int result)
590 {
591 hostdata->state = NCR_700_HOST_FREE;
592 hostdata->cmd = NULL;
593
594 if(SCp != NULL) {
595 struct NCR_700_command_slot *slot =
596 (struct NCR_700_command_slot *)SCp->host_scribble;
597
598 dma_unmap_single(hostdata->dev, slot->pCmd,
599 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
600 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
601 char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
602 #ifdef NCR_700_DEBUG
603 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
604 SCp, SCp->cmnd[7], result);
605 scsi_print_sense("53c700", SCp);
606
607 #endif
608 dma_unmap_single(hostdata->dev, slot->dma_handle,
609 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
610 /* restore the old result if the request sense was
611 * successful */
612 if (result == 0)
613 result = cmnd[7];
614 /* restore the original length */
615 SCp->cmd_len = cmnd[8];
616 } else
617 NCR_700_unmap(hostdata, SCp, slot);
618
619 free_slot(slot, hostdata);
620 #ifdef NCR_700_DEBUG
621 if(NCR_700_get_depth(SCp->device) == 0 ||
622 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
623 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
624 NCR_700_get_depth(SCp->device));
625 #endif /* NCR_700_DEBUG */
626 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
627
628 SCp->host_scribble = NULL;
629 SCp->result = result;
630 SCp->scsi_done(SCp);
631 } else {
632 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
633 }
634 }
635
636
637 STATIC void
638 NCR_700_internal_bus_reset(struct Scsi_Host *host)
639 {
640 /* Bus reset */
641 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
642 udelay(50);
643 NCR_700_writeb(0, host, SCNTL1_REG);
644
645 }
646
647 STATIC void
648 NCR_700_chip_setup(struct Scsi_Host *host)
649 {
650 struct NCR_700_Host_Parameters *hostdata =
651 (struct NCR_700_Host_Parameters *)host->hostdata[0];
652 __u8 min_period;
653 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
654
655 if(hostdata->chip710) {
656 __u8 burst_disable = 0;
657 __u8 burst_length = 0;
658
659 switch (hostdata->burst_length) {
660 case 1:
661 burst_length = BURST_LENGTH_1;
662 break;
663 case 2:
664 burst_length = BURST_LENGTH_2;
665 break;
666 case 4:
667 burst_length = BURST_LENGTH_4;
668 break;
669 case 8:
670 burst_length = BURST_LENGTH_8;
671 break;
672 default:
673 burst_disable = BURST_DISABLE;
674 break;
675 }
676 hostdata->dcntl_extra |= COMPAT_700_MODE;
677
678 NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);
679 NCR_700_writeb(burst_length | hostdata->dmode_extra,
680 host, DMODE_710_REG);
681 NCR_700_writeb(burst_disable | hostdata->ctest7_extra |
682 (hostdata->differential ? DIFF : 0),
683 host, CTEST7_REG);
684 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
685 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
686 | AUTO_ATN, host, SCNTL0_REG);
687 } else {
688 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
689 host, DMODE_700_REG);
690 NCR_700_writeb(hostdata->differential ?
691 DIFF : 0, host, CTEST7_REG);
692 if(hostdata->fast) {
693 /* this is for 700-66, does nothing on 700 */
694 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
695 | GENERATE_RECEIVE_PARITY, host,
696 CTEST8_REG);
697 } else {
698 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
699 | PARITY | AUTO_ATN, host, SCNTL0_REG);
700 }
701 }
702
703 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
704 NCR_700_writeb(0, host, SBCL_REG);
705 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
706
707 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
708 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
709
710 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
711 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
712 if(hostdata->clock > 75) {
713 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
714 /* do the best we can, but the async clock will be out
715 * of spec: sync divider 2, async divider 3 */
716 DEBUG(("53c700: sync 2 async 3\n"));
717 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
718 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
719 hostdata->sync_clock = hostdata->clock/2;
720 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
721 /* sync divider 1.5, async divider 3 */
722 DEBUG(("53c700: sync 1.5 async 3\n"));
723 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
724 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
725 hostdata->sync_clock = hostdata->clock*2;
726 hostdata->sync_clock /= 3;
727
728 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
729 /* sync divider 1, async divider 2 */
730 DEBUG(("53c700: sync 1 async 2\n"));
731 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
732 NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);
733 hostdata->sync_clock = hostdata->clock;
734 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
735 /* sync divider 1, async divider 1.5 */
736 DEBUG(("53c700: sync 1 async 1.5\n"));
737 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
738 NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);
739 hostdata->sync_clock = hostdata->clock;
740 } else {
741 DEBUG(("53c700: sync 1 async 1\n"));
742 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
743 NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);
744 /* sync divider 1, async divider 1 */
745 hostdata->sync_clock = hostdata->clock;
746 }
747 /* Calculate the actual minimum period that can be supported
748 * by our synchronous clock speed. See the 710 manual for
749 * exact details of this calculation which is based on a
750 * setting of the SXFER register */
751 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
752 hostdata->min_period = NCR_700_MIN_PERIOD;
753 if(min_period > NCR_700_MIN_PERIOD)
754 hostdata->min_period = min_period;
755 }
756
757 STATIC void
758 NCR_700_chip_reset(struct Scsi_Host *host)
759 {
760 struct NCR_700_Host_Parameters *hostdata =
761 (struct NCR_700_Host_Parameters *)host->hostdata[0];
762 if(hostdata->chip710) {
763 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
764 udelay(100);
765
766 NCR_700_writeb(0, host, ISTAT_REG);
767 } else {
768 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
769 udelay(100);
770
771 NCR_700_writeb(0, host, DCNTL_REG);
772 }
773
774 mdelay(1000);
775
776 NCR_700_chip_setup(host);
777 }
778
779 /* The heart of the message processing engine is that the instruction
780 * immediately after the INT is the normal case (and so must be CLEAR
781 * ACK). If we want to do something else, we call that routine in
782 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
783 * ACK) so that the routine returns correctly to resume its activity
784 * */
785 STATIC __u32
786 process_extended_message(struct Scsi_Host *host,
787 struct NCR_700_Host_Parameters *hostdata,
788 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
789 {
790 __u32 resume_offset = dsp, temp = dsp + 8;
791 __u8 pun = 0xff, lun = 0xff;
792
793 if(SCp != NULL) {
794 pun = SCp->device->id;
795 lun = SCp->device->lun;
796 }
797
798 switch(hostdata->msgin[2]) {
799 case A_SDTR_MSG:
800 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
801 struct scsi_target *starget = SCp->device->sdev_target;
802 __u8 period = hostdata->msgin[3];
803 __u8 offset = hostdata->msgin[4];
804
805 if(offset == 0 || period == 0) {
806 offset = 0;
807 period = 0;
808 }
809
810 spi_offset(starget) = offset;
811 spi_period(starget) = period;
812
813 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
814 spi_display_xfer_agreement(starget);
815 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
816 }
817
818 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
819 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
820
821 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
822 host, SXFER_REG);
823
824 } else {
825 /* SDTR message out of the blue, reject it */
826 shost_printk(KERN_WARNING, host,
827 "Unexpected SDTR msg\n");
828 hostdata->msgout[0] = A_REJECT_MSG;
829 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
830 script_patch_16(hostdata->dev, hostdata->script,
831 MessageCount, 1);
832 /* SendMsgOut returns, so set up the return
833 * address */
834 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
835 }
836 break;
837
838 case A_WDTR_MSG:
839 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
840 host->host_no, pun, lun);
841 hostdata->msgout[0] = A_REJECT_MSG;
842 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
843 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
844 1);
845 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
846
847 break;
848
849 default:
850 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
851 host->host_no, pun, lun,
852 NCR_700_phase[(dsps & 0xf00) >> 8]);
853 spi_print_msg(hostdata->msgin);
854 printk("\n");
855 /* just reject it */
856 hostdata->msgout[0] = A_REJECT_MSG;
857 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
858 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
859 1);
860 /* SendMsgOut returns, so set up the return
861 * address */
862 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
863 }
864 NCR_700_writel(temp, host, TEMP_REG);
865 return resume_offset;
866 }
867
868 STATIC __u32
869 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
870 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
871 {
872 /* work out where to return to */
873 __u32 temp = dsp + 8, resume_offset = dsp;
874 __u8 pun = 0xff, lun = 0xff;
875
876 if(SCp != NULL) {
877 pun = SCp->device->id;
878 lun = SCp->device->lun;
879 }
880
881 #ifdef NCR_700_DEBUG
882 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
883 NCR_700_phase[(dsps & 0xf00) >> 8]);
884 spi_print_msg(hostdata->msgin);
885 printk("\n");
886 #endif
887
888 switch(hostdata->msgin[0]) {
889
890 case A_EXTENDED_MSG:
891 resume_offset = process_extended_message(host, hostdata, SCp,
892 dsp, dsps);
893 break;
894
895 case A_REJECT_MSG:
896 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
897 /* Rejected our sync negotiation attempt */
898 spi_period(SCp->device->sdev_target) =
899 spi_offset(SCp->device->sdev_target) = 0;
900 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
901 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
902 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
903 /* rejected our first simple tag message */
904 scmd_printk(KERN_WARNING, SCp,
905 "Rejected first tag queue attempt, turning off tag queueing\n");
906 /* we're done negotiating */
907 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
908 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
909 SCp->device->tagged_supported = 0;
910 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
911 } else {
912 shost_printk(KERN_WARNING, host,
913 "(%d:%d) Unexpected REJECT Message %s\n",
914 pun, lun,
915 NCR_700_phase[(dsps & 0xf00) >> 8]);
916 /* however, just ignore it */
917 }
918 break;
919
920 case A_PARITY_ERROR_MSG:
921 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
922 pun, lun);
923 NCR_700_internal_bus_reset(host);
924 break;
925 case A_SIMPLE_TAG_MSG:
926 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
927 pun, lun, hostdata->msgin[1],
928 NCR_700_phase[(dsps & 0xf00) >> 8]);
929 /* just ignore it */
930 break;
931 default:
932 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
933 host->host_no, pun, lun,
934 NCR_700_phase[(dsps & 0xf00) >> 8]);
935
936 spi_print_msg(hostdata->msgin);
937 printk("\n");
938 /* just reject it */
939 hostdata->msgout[0] = A_REJECT_MSG;
940 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
941 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
942 1);
943 /* SendMsgOut returns, so set up the return
944 * address */
945 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
946
947 break;
948 }
949 NCR_700_writel(temp, host, TEMP_REG);
950 /* set us up to receive another message */
951 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
952 return resume_offset;
953 }
954
955 STATIC __u32
956 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
957 struct Scsi_Host *host,
958 struct NCR_700_Host_Parameters *hostdata)
959 {
960 __u32 resume_offset = 0;
961 __u8 pun = 0xff, lun=0xff;
962
963 if(SCp != NULL) {
964 pun = SCp->device->id;
965 lun = SCp->device->lun;
966 }
967
968 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
969 DEBUG((" COMMAND COMPLETE, status=%02x\n",
970 hostdata->status[0]));
971 /* OK, if TCQ still under negotiation, we now know it works */
972 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
973 NCR_700_set_tag_neg_state(SCp->device,
974 NCR_700_FINISHED_TAG_NEGOTIATION);
975
976 /* check for contingent allegiance contitions */
977 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
978 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
979 struct NCR_700_command_slot *slot =
980 (struct NCR_700_command_slot *)SCp->host_scribble;
981 if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
982 /* OOPS: bad device, returning another
983 * contingent allegiance condition */
984 scmd_printk(KERN_ERR, SCp,
985 "broken device is looping in contingent allegiance: ignoring\n");
986 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
987 } else {
988 char *cmnd =
989 NCR_700_get_sense_cmnd(SCp->device);
990 #ifdef NCR_DEBUG
991 scsi_print_command(SCp);
992 printk(" cmd %p has status %d, requesting sense\n",
993 SCp, hostdata->status[0]);
994 #endif
995 /* we can destroy the command here
996 * because the contingent allegiance
997 * condition will cause a retry which
998 * will re-copy the command from the
999 * saved data_cmnd. We also unmap any
1000 * data associated with the command
1001 * here */
1002 NCR_700_unmap(hostdata, SCp, slot);
1003 dma_unmap_single(hostdata->dev, slot->pCmd,
1004 MAX_COMMAND_SIZE,
1005 DMA_TO_DEVICE);
1006
1007 cmnd[0] = REQUEST_SENSE;
1008 cmnd[1] = (SCp->device->lun & 0x7) << 5;
1009 cmnd[2] = 0;
1010 cmnd[3] = 0;
1011 cmnd[4] = SCSI_SENSE_BUFFERSIZE;
1012 cmnd[5] = 0;
1013 /* Here's a quiet hack: the
1014 * REQUEST_SENSE command is six bytes,
1015 * so store a flag indicating that
1016 * this was an internal sense request
1017 * and the original status at the end
1018 * of the command */
1019 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1020 cmnd[7] = hostdata->status[0];
1021 cmnd[8] = SCp->cmd_len;
1022 SCp->cmd_len = 6; /* command length for
1023 * REQUEST_SENSE */
1024 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1025 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1026 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | SCSI_SENSE_BUFFERSIZE);
1027 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1028 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1029 slot->SG[1].pAddr = 0;
1030 slot->resume_offset = hostdata->pScript;
1031 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1032 dma_cache_sync(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1033
1034 /* queue the command for reissue */
1035 slot->state = NCR_700_SLOT_QUEUED;
1036 slot->flags = NCR_700_FLAG_AUTOSENSE;
1037 hostdata->state = NCR_700_HOST_FREE;
1038 hostdata->cmd = NULL;
1039 }
1040 } else {
1041 // Currently rely on the mid layer evaluation
1042 // of the tag queuing capability
1043 //
1044 //if(status_byte(hostdata->status[0]) == GOOD &&
1045 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1046 // /* Piggy back the tag queueing support
1047 // * on this command */
1048 // dma_sync_single_for_cpu(hostdata->dev,
1049 // slot->dma_handle,
1050 // SCp->request_bufflen,
1051 // DMA_FROM_DEVICE);
1052 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1053 // scmd_printk(KERN_INFO, SCp,
1054 // "Enabling Tag Command Queuing\n");
1055 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1056 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1057 // } else {
1058 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1059 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1060 // }
1061 //}
1062 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1063 }
1064 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1065 __u8 i = (dsps & 0xf00) >> 8;
1066
1067 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1068 NCR_700_phase[i],
1069 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1070 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =",
1071 SCp->cmd_len);
1072 scsi_print_command(SCp);
1073
1074 NCR_700_internal_bus_reset(host);
1075 } else if((dsps & 0xfffff000) == A_FATAL) {
1076 int i = (dsps & 0xfff);
1077
1078 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1079 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1080 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1081 printk(KERN_ERR " msg begins %02x %02x\n",
1082 hostdata->msgin[0], hostdata->msgin[1]);
1083 }
1084 NCR_700_internal_bus_reset(host);
1085 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1086 #ifdef NCR_700_DEBUG
1087 __u8 i = (dsps & 0xf00) >> 8;
1088
1089 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1090 host->host_no, pun, lun,
1091 i, NCR_700_phase[i]);
1092 #endif
1093 save_for_reselection(hostdata, SCp, dsp);
1094
1095 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1096 __u8 lun;
1097 struct NCR_700_command_slot *slot;
1098 __u8 reselection_id = hostdata->reselection_id;
1099 struct scsi_device *SDp;
1100
1101 lun = hostdata->msgin[0] & 0x1f;
1102
1103 hostdata->reselection_id = 0xff;
1104 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1105 host->host_no, reselection_id, lun));
1106 /* clear the reselection indicator */
1107 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1108 if(unlikely(SDp == NULL)) {
1109 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1110 host->host_no, reselection_id, lun);
1111 BUG();
1112 }
1113 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1114 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1115 if(unlikely(SCp == NULL)) {
1116 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1117 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1118 BUG();
1119 }
1120
1121 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1122 DDEBUG(KERN_DEBUG, SDp,
1123 "reselection is tag %d, slot %p(%d)\n",
1124 hostdata->msgin[2], slot, slot->tag);
1125 } else {
1126 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1127 if(unlikely(SCp == NULL)) {
1128 sdev_printk(KERN_ERR, SDp,
1129 "no saved request for untagged cmd\n");
1130 BUG();
1131 }
1132 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1133 }
1134
1135 if(slot == NULL) {
1136 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1137 host->host_no, reselection_id, lun,
1138 hostdata->msgin[0], hostdata->msgin[1],
1139 hostdata->msgin[2]);
1140 } else {
1141 if(hostdata->state != NCR_700_HOST_BUSY)
1142 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1143 host->host_no);
1144 resume_offset = slot->resume_offset;
1145 hostdata->cmd = slot->cmnd;
1146
1147 /* re-patch for this command */
1148 script_patch_32_abs(hostdata->dev, hostdata->script,
1149 CommandAddress, slot->pCmd);
1150 script_patch_16(hostdata->dev, hostdata->script,
1151 CommandCount, slot->cmnd->cmd_len);
1152 script_patch_32_abs(hostdata->dev, hostdata->script,
1153 SGScriptStartAddress,
1154 to32bit(&slot->pSG[0].ins));
1155
1156 /* Note: setting SXFER only works if we're
1157 * still in the MESSAGE phase, so it is vital
1158 * that ACK is still asserted when we process
1159 * the reselection message. The resume offset
1160 * should therefore always clear ACK */
1161 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1162 host, SXFER_REG);
1163 dma_cache_sync(hostdata->dev, hostdata->msgin,
1164 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1165 dma_cache_sync(hostdata->dev, hostdata->msgout,
1166 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1167 /* I'm just being paranoid here, the command should
1168 * already have been flushed from the cache */
1169 dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
1170 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1171
1172
1173
1174 }
1175 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1176
1177 /* This section is full of debugging code because I've
1178 * never managed to reach it. I think what happens is
1179 * that, because the 700 runs with selection
1180 * interrupts enabled the whole time that we take a
1181 * selection interrupt before we manage to get to the
1182 * reselected script interrupt */
1183
1184 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1185 struct NCR_700_command_slot *slot;
1186
1187 /* Take out our own ID */
1188 reselection_id &= ~(1<<host->this_id);
1189
1190 /* I've never seen this happen, so keep this as a printk rather
1191 * than a debug */
1192 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1193 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1194
1195 {
1196 /* FIXME: DEBUGGING CODE */
1197 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1198 int i;
1199
1200 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1201 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1202 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1203 break;
1204 }
1205 printk(KERN_INFO "IDENTIFIED SG segment as being %08x in slot %p, cmd %p, slot->resume_offset=%08x\n", SG, &hostdata->slots[i], hostdata->slots[i].cmnd, hostdata->slots[i].resume_offset);
1206 SCp = hostdata->slots[i].cmnd;
1207 }
1208
1209 if(SCp != NULL) {
1210 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1211 /* change slot from busy to queued to redo command */
1212 slot->state = NCR_700_SLOT_QUEUED;
1213 }
1214 hostdata->cmd = NULL;
1215
1216 if(reselection_id == 0) {
1217 if(hostdata->reselection_id == 0xff) {
1218 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1219 return 0;
1220 } else {
1221 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1222 host->host_no);
1223 reselection_id = hostdata->reselection_id;
1224 }
1225 } else {
1226
1227 /* convert to real ID */
1228 reselection_id = bitmap_to_number(reselection_id);
1229 }
1230 hostdata->reselection_id = reselection_id;
1231 /* just in case we have a stale simple tag message, clear it */
1232 hostdata->msgin[1] = 0;
1233 dma_cache_sync(hostdata->dev, hostdata->msgin,
1234 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1235 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1236 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1237 } else {
1238 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1239 }
1240 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1241 /* we've just disconnected from the bus, do nothing since
1242 * a return here will re-run the queued command slot
1243 * that may have been interrupted by the initial selection */
1244 DEBUG((" SELECTION COMPLETED\n"));
1245 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1246 resume_offset = process_message(host, hostdata, SCp,
1247 dsp, dsps);
1248 } else if((dsps & 0xfffff000) == 0) {
1249 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1250 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1251 host->host_no, pun, lun, NCR_700_condition[i],
1252 NCR_700_phase[j], dsp - hostdata->pScript);
1253 if(SCp != NULL) {
1254 struct scatterlist *sg;
1255
1256 scsi_print_command(SCp);
1257 scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {
1258 printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, sg->length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
1259 }
1260 }
1261 NCR_700_internal_bus_reset(host);
1262 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1263 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1264 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1265 resume_offset = dsp;
1266 } else {
1267 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1268 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1269 NCR_700_internal_bus_reset(host);
1270 }
1271 return resume_offset;
1272 }
1273
1274 /* We run the 53c700 with selection interrupts always enabled. This
1275 * means that the chip may be selected as soon as the bus frees. On a
1276 * busy bus, this can be before the scripts engine finishes its
1277 * processing. Therefore, part of the selection processing has to be
1278 * to find out what the scripts engine is doing and complete the
1279 * function if necessary (i.e. process the pending disconnect or save
1280 * the interrupted initial selection */
1281 STATIC inline __u32
1282 process_selection(struct Scsi_Host *host, __u32 dsp)
1283 {
1284 __u8 id = 0; /* Squash compiler warning */
1285 int count = 0;
1286 __u32 resume_offset = 0;
1287 struct NCR_700_Host_Parameters *hostdata =
1288 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1289 struct scsi_cmnd *SCp = hostdata->cmd;
1290 __u8 sbcl;
1291
1292 for(count = 0; count < 5; count++) {
1293 id = NCR_700_readb(host, hostdata->chip710 ?
1294 CTEST9_REG : SFBR_REG);
1295
1296 /* Take out our own ID */
1297 id &= ~(1<<host->this_id);
1298 if(id != 0)
1299 break;
1300 udelay(5);
1301 }
1302 sbcl = NCR_700_readb(host, SBCL_REG);
1303 if((sbcl & SBCL_IO) == 0) {
1304 /* mark as having been selected rather than reselected */
1305 id = 0xff;
1306 } else {
1307 /* convert to real ID */
1308 hostdata->reselection_id = id = bitmap_to_number(id);
1309 DEBUG(("scsi%d: Reselected by %d\n",
1310 host->host_no, id));
1311 }
1312 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1313 struct NCR_700_command_slot *slot =
1314 (struct NCR_700_command_slot *)SCp->host_scribble;
1315 DEBUG((" ID %d WARNING: RESELECTION OF BUSY HOST, saving cmd %p, slot %p, addr %x [%04x], resume %x!\n", id, hostdata->cmd, slot, dsp, dsp - hostdata->pScript, resume_offset));
1316
1317 switch(dsp - hostdata->pScript) {
1318 case Ent_Disconnect1:
1319 case Ent_Disconnect2:
1320 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1321 break;
1322 case Ent_Disconnect3:
1323 case Ent_Disconnect4:
1324 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1325 break;
1326 case Ent_Disconnect5:
1327 case Ent_Disconnect6:
1328 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1329 break;
1330 case Ent_Disconnect7:
1331 case Ent_Disconnect8:
1332 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1333 break;
1334 case Ent_Finish1:
1335 case Ent_Finish2:
1336 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1337 break;
1338
1339 default:
1340 slot->state = NCR_700_SLOT_QUEUED;
1341 break;
1342 }
1343 }
1344 hostdata->state = NCR_700_HOST_BUSY;
1345 hostdata->cmd = NULL;
1346 /* clear any stale simple tag message */
1347 hostdata->msgin[1] = 0;
1348 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1349 DMA_BIDIRECTIONAL);
1350
1351 if(id == 0xff) {
1352 /* Selected as target, Ignore */
1353 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1354 } else if(hostdata->tag_negotiated & (1<<id)) {
1355 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1356 } else {
1357 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1358 }
1359 return resume_offset;
1360 }
1361
1362 static inline void
1363 NCR_700_clear_fifo(struct Scsi_Host *host) {
1364 const struct NCR_700_Host_Parameters *hostdata
1365 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1366 if(hostdata->chip710) {
1367 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1368 } else {
1369 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1370 }
1371 }
1372
1373 static inline void
1374 NCR_700_flush_fifo(struct Scsi_Host *host) {
1375 const struct NCR_700_Host_Parameters *hostdata
1376 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1377 if(hostdata->chip710) {
1378 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1379 udelay(10);
1380 NCR_700_writeb(0, host, CTEST8_REG);
1381 } else {
1382 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1383 udelay(10);
1384 NCR_700_writeb(0, host, DFIFO_REG);
1385 }
1386 }
1387
1388
1389 /* The queue lock with interrupts disabled must be held on entry to
1390 * this function */
1391 STATIC int
1392 NCR_700_start_command(struct scsi_cmnd *SCp)
1393 {
1394 struct NCR_700_command_slot *slot =
1395 (struct NCR_700_command_slot *)SCp->host_scribble;
1396 struct NCR_700_Host_Parameters *hostdata =
1397 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1398 __u16 count = 1; /* for IDENTIFY message */
1399
1400 if(hostdata->state != NCR_700_HOST_FREE) {
1401 /* keep this inside the lock to close the race window where
1402 * the running command finishes on another CPU while we don't
1403 * change the state to queued on this one */
1404 slot->state = NCR_700_SLOT_QUEUED;
1405
1406 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1407 SCp->device->host->host_no, slot->cmnd, slot));
1408 return 0;
1409 }
1410 hostdata->state = NCR_700_HOST_BUSY;
1411 hostdata->cmd = SCp;
1412 slot->state = NCR_700_SLOT_BUSY;
1413 /* keep interrupts disabled until we have the command correctly
1414 * set up so we cannot take a selection interrupt */
1415
1416 hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1417 slot->flags != NCR_700_FLAG_AUTOSENSE),
1418 SCp->device->lun);
1419 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1420 * if the negotiated transfer parameters still hold, so
1421 * always renegotiate them */
1422 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1423 slot->flags == NCR_700_FLAG_AUTOSENSE) {
1424 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1425 }
1426
1427 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1428 * If a contingent allegiance condition exists, the device
1429 * will refuse all tags, so send the request sense as untagged
1430 * */
1431 if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1432 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1433 slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1434 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1435 }
1436
1437 if(hostdata->fast &&
1438 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1439 count += spi_populate_sync_msg(&hostdata->msgout[count],
1440 spi_period(SCp->device->sdev_target),
1441 spi_offset(SCp->device->sdev_target));
1442 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1443 }
1444
1445 script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
1446
1447
1448 script_patch_ID(hostdata->dev, hostdata->script,
1449 Device_ID, 1<<scmd_id(SCp));
1450
1451 script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
1452 slot->pCmd);
1453 script_patch_16(hostdata->dev, hostdata->script, CommandCount,
1454 SCp->cmd_len);
1455 /* finally plumb the beginning of the SG list into the script
1456 * */
1457 script_patch_32_abs(hostdata->dev, hostdata->script,
1458 SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
1459 NCR_700_clear_fifo(SCp->device->host);
1460
1461 if(slot->resume_offset == 0)
1462 slot->resume_offset = hostdata->pScript;
1463 /* now perform all the writebacks and invalidates */
1464 dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
1465 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1466 DMA_FROM_DEVICE);
1467 dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1468 dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE);
1469
1470 /* set the synchronous period/offset */
1471 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1472 SCp->device->host, SXFER_REG);
1473 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1474 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1475
1476 return 1;
1477 }
1478
1479 irqreturn_t
1480 NCR_700_intr(int irq, void *dev_id)
1481 {
1482 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1483 struct NCR_700_Host_Parameters *hostdata =
1484 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1485 __u8 istat;
1486 __u32 resume_offset = 0;
1487 __u8 pun = 0xff, lun = 0xff;
1488 unsigned long flags;
1489 int handled = 0;
1490
1491 /* Use the host lock to serialise access to the 53c700
1492 * hardware. Note: In future, we may need to take the queue
1493 * lock to enter the done routines. When that happens, we
1494 * need to ensure that for this driver, the host lock and the
1495 * queue lock point to the same thing. */
1496 spin_lock_irqsave(host->host_lock, flags);
1497 if((istat = NCR_700_readb(host, ISTAT_REG))
1498 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1499 __u32 dsps;
1500 __u8 sstat0 = 0, dstat = 0;
1501 __u32 dsp;
1502 struct scsi_cmnd *SCp = hostdata->cmd;
1503 enum NCR_700_Host_State state;
1504
1505 handled = 1;
1506 state = hostdata->state;
1507 SCp = hostdata->cmd;
1508
1509 if(istat & SCSI_INT_PENDING) {
1510 udelay(10);
1511
1512 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1513 }
1514
1515 if(istat & DMA_INT_PENDING) {
1516 udelay(10);
1517
1518 dstat = NCR_700_readb(host, DSTAT_REG);
1519 }
1520
1521 dsps = NCR_700_readl(host, DSPS_REG);
1522 dsp = NCR_700_readl(host, DSP_REG);
1523
1524 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1525 host->host_no, istat, sstat0, dstat,
1526 (dsp - (__u32)(hostdata->pScript))/4,
1527 dsp, dsps));
1528
1529 if(SCp != NULL) {
1530 pun = SCp->device->id;
1531 lun = SCp->device->lun;
1532 }
1533
1534 if(sstat0 & SCSI_RESET_DETECTED) {
1535 struct scsi_device *SDp;
1536 int i;
1537
1538 hostdata->state = NCR_700_HOST_BUSY;
1539
1540 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1541 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1542
1543 scsi_report_bus_reset(host, 0);
1544
1545 /* clear all the negotiated parameters */
1546 __shost_for_each_device(SDp, host)
1547 NCR_700_clear_flag(SDp, ~0);
1548
1549 /* clear all the slots and their pending commands */
1550 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1551 struct scsi_cmnd *SCp;
1552 struct NCR_700_command_slot *slot =
1553 &hostdata->slots[i];
1554
1555 if(slot->state == NCR_700_SLOT_FREE)
1556 continue;
1557
1558 SCp = slot->cmnd;
1559 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1560 slot, SCp);
1561 free_slot(slot, hostdata);
1562 SCp->host_scribble = NULL;
1563 NCR_700_set_depth(SCp->device, 0);
1564 /* NOTE: deadlock potential here: we
1565 * rely on mid-layer guarantees that
1566 * scsi_done won't try to issue the
1567 * command again otherwise we'll
1568 * deadlock on the
1569 * hostdata->state_lock */
1570 SCp->result = DID_RESET << 16;
1571 SCp->scsi_done(SCp);
1572 }
1573 mdelay(25);
1574 NCR_700_chip_setup(host);
1575
1576 hostdata->state = NCR_700_HOST_FREE;
1577 hostdata->cmd = NULL;
1578 /* signal back if this was an eh induced reset */
1579 if(hostdata->eh_complete != NULL)
1580 complete(hostdata->eh_complete);
1581 goto out_unlock;
1582 } else if(sstat0 & SELECTION_TIMEOUT) {
1583 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1584 host->host_no, pun, lun));
1585 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1586 } else if(sstat0 & PHASE_MISMATCH) {
1587 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1588 (struct NCR_700_command_slot *)SCp->host_scribble;
1589
1590 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1591 /* It wants to reply to some part of
1592 * our message */
1593 #ifdef NCR_700_DEBUG
1594 __u32 temp = NCR_700_readl(host, TEMP_REG);
1595 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1596 printk("scsi%d (%d:%d) PHASE MISMATCH IN SEND MESSAGE %d remain, return %p[%04x], phase %s\n", host->host_no, pun, lun, count, (void *)temp, temp - hostdata->pScript, sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1597 #endif
1598 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1599 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1600 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1601 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1602 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1603 int residual = NCR_700_data_residual(host);
1604 int i;
1605 #ifdef NCR_700_DEBUG
1606 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1607
1608 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1609 host->host_no, pun, lun,
1610 SGcount, data_transfer);
1611 scsi_print_command(SCp);
1612 if(residual) {
1613 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1614 host->host_no, pun, lun,
1615 SGcount, data_transfer, residual);
1616 }
1617 #endif
1618 data_transfer += residual;
1619
1620 if(data_transfer != 0) {
1621 int count;
1622 __u32 pAddr;
1623
1624 SGcount--;
1625
1626 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1627 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1628 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1629 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1630 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1631 pAddr += (count - data_transfer);
1632 #ifdef NCR_700_DEBUG
1633 if(pAddr != naddr) {
1634 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);
1635 }
1636 #endif
1637 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1638 }
1639 /* set the executed moves to nops */
1640 for(i=0; i<SGcount; i++) {
1641 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1642 slot->SG[i].pAddr = 0;
1643 }
1644 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1645 /* and pretend we disconnected after
1646 * the command phase */
1647 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1648 /* make sure all the data is flushed */
1649 NCR_700_flush_fifo(host);
1650 } else {
1651 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1652 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1653 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1654 NCR_700_internal_bus_reset(host);
1655 }
1656
1657 } else if(sstat0 & SCSI_GROSS_ERROR) {
1658 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1659 host->host_no, pun, lun);
1660 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1661 } else if(sstat0 & PARITY_ERROR) {
1662 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1663 host->host_no, pun, lun);
1664 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1665 } else if(dstat & SCRIPT_INT_RECEIVED) {
1666 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1667 host->host_no, pun, lun));
1668 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1669 } else if(dstat & (ILGL_INST_DETECTED)) {
1670 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1671 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1672 host->host_no, pun, lun,
1673 dsp, dsp - hostdata->pScript);
1674 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1675 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1676 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1677 host->host_no, pun, lun, dstat);
1678 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1679 }
1680
1681
1682 /* NOTE: selection interrupt processing MUST occur
1683 * after script interrupt processing to correctly cope
1684 * with the case where we process a disconnect and
1685 * then get reselected before we process the
1686 * disconnection */
1687 if(sstat0 & SELECTED) {
1688 /* FIXME: It currently takes at least FOUR
1689 * interrupts to complete a command that
1690 * disconnects: one for the disconnect, one
1691 * for the reselection, one to get the
1692 * reselection data and one to complete the
1693 * command. If we guess the reselected
1694 * command here and prepare it, we only need
1695 * to get a reselection data interrupt if we
1696 * guessed wrongly. Since the interrupt
1697 * overhead is much greater than the command
1698 * setup, this would be an efficient
1699 * optimisation particularly as we probably
1700 * only have one outstanding command on a
1701 * target most of the time */
1702
1703 resume_offset = process_selection(host, dsp);
1704
1705 }
1706
1707 }
1708
1709 if(resume_offset) {
1710 if(hostdata->state != NCR_700_HOST_BUSY) {
1711 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1712 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1713 hostdata->state = NCR_700_HOST_BUSY;
1714 }
1715
1716 DEBUG(("Attempting to resume at %x\n", resume_offset));
1717 NCR_700_clear_fifo(host);
1718 NCR_700_writel(resume_offset, host, DSP_REG);
1719 }
1720 /* There is probably a technical no-no about this: If we're a
1721 * shared interrupt and we got this interrupt because the
1722 * other device needs servicing not us, we're still going to
1723 * check our queued commands here---of course, there shouldn't
1724 * be any outstanding.... */
1725 if(hostdata->state == NCR_700_HOST_FREE) {
1726 int i;
1727
1728 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1729 /* fairness: always run the queue from the last
1730 * position we left off */
1731 int j = (i + hostdata->saved_slot_position)
1732 % NCR_700_COMMAND_SLOTS_PER_HOST;
1733
1734 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1735 continue;
1736 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1737 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1738 host->host_no, &hostdata->slots[j],
1739 hostdata->slots[j].cmnd));
1740 hostdata->saved_slot_position = j + 1;
1741 }
1742
1743 break;
1744 }
1745 }
1746 out_unlock:
1747 spin_unlock_irqrestore(host->host_lock, flags);
1748 return IRQ_RETVAL(handled);
1749 }
1750
1751 static int
1752 NCR_700_queuecommand_lck(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1753 {
1754 struct NCR_700_Host_Parameters *hostdata =
1755 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1756 __u32 move_ins;
1757 enum dma_data_direction direction;
1758 struct NCR_700_command_slot *slot;
1759
1760 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1761 /* We're over our allocation, this should never happen
1762 * since we report the max allocation to the mid layer */
1763 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1764 return 1;
1765 }
1766 /* check for untagged commands. We cannot have any outstanding
1767 * commands if we accept them. Commands could be untagged because:
1768 *
1769 * - The tag negotiated bitmap is clear
1770 * - The blk layer sent and untagged command
1771 */
1772 if(NCR_700_get_depth(SCp->device) != 0
1773 && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1774 || !blk_rq_tagged(SCp->request))) {
1775 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1776 NCR_700_get_depth(SCp->device));
1777 return SCSI_MLQUEUE_DEVICE_BUSY;
1778 }
1779 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1780 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1781 NCR_700_get_depth(SCp->device));
1782 return SCSI_MLQUEUE_DEVICE_BUSY;
1783 }
1784 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1785
1786 /* begin the command here */
1787 /* no need to check for NULL, test for command_slot_count above
1788 * ensures a slot is free */
1789 slot = find_empty_slot(hostdata);
1790
1791 slot->cmnd = SCp;
1792
1793 SCp->scsi_done = done;
1794 SCp->host_scribble = (unsigned char *)slot;
1795 SCp->SCp.ptr = NULL;
1796 SCp->SCp.buffer = NULL;
1797
1798 #ifdef NCR_700_DEBUG
1799 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1800 scsi_print_command(SCp);
1801 #endif
1802 if(blk_rq_tagged(SCp->request)
1803 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1804 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1805 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1806 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1807 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1808 }
1809
1810 /* here we may have to process an untagged command. The gate
1811 * above ensures that this will be the only one outstanding,
1812 * so clear the tag negotiated bit.
1813 *
1814 * FIXME: This will royally screw up on multiple LUN devices
1815 * */
1816 if(!blk_rq_tagged(SCp->request)
1817 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1818 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1819 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1820 }
1821
1822 if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1823 && scsi_get_tag_type(SCp->device)) {
1824 slot->tag = SCp->request->tag;
1825 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1826 slot->tag, slot);
1827 } else {
1828 slot->tag = SCSI_NO_TAG;
1829 /* must populate current_cmnd for scsi_find_tag to work */
1830 SCp->device->current_cmnd = SCp;
1831 }
1832 /* sanity check: some of the commands generated by the mid-layer
1833 * have an eccentric idea of their sc_data_direction */
1834 if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
1835 SCp->sc_data_direction != DMA_NONE) {
1836 #ifdef NCR_700_DEBUG
1837 printk("53c700: Command");
1838 scsi_print_command(SCp);
1839 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1840 #endif
1841 SCp->sc_data_direction = DMA_NONE;
1842 }
1843
1844 switch (SCp->cmnd[0]) {
1845 case REQUEST_SENSE:
1846 /* clear the internal sense magic */
1847 SCp->cmnd[6] = 0;
1848 /* fall through */
1849 default:
1850 /* OK, get it from the command */
1851 switch(SCp->sc_data_direction) {
1852 case DMA_BIDIRECTIONAL:
1853 default:
1854 printk(KERN_ERR "53c700: Unknown command for data direction ");
1855 scsi_print_command(SCp);
1856
1857 move_ins = 0;
1858 break;
1859 case DMA_NONE:
1860 move_ins = 0;
1861 break;
1862 case DMA_FROM_DEVICE:
1863 move_ins = SCRIPT_MOVE_DATA_IN;
1864 break;
1865 case DMA_TO_DEVICE:
1866 move_ins = SCRIPT_MOVE_DATA_OUT;
1867 break;
1868 }
1869 }
1870
1871 /* now build the scatter gather list */
1872 direction = SCp->sc_data_direction;
1873 if(move_ins != 0) {
1874 int i;
1875 int sg_count;
1876 dma_addr_t vPtr = 0;
1877 struct scatterlist *sg;
1878 __u32 count = 0;
1879
1880 sg_count = scsi_dma_map(SCp);
1881 BUG_ON(sg_count < 0);
1882
1883 scsi_for_each_sg(SCp, sg, sg_count, i) {
1884 vPtr = sg_dma_address(sg);
1885 count = sg_dma_len(sg);
1886
1887 slot->SG[i].ins = bS_to_host(move_ins | count);
1888 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1889 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1890 slot->SG[i].pAddr = bS_to_host(vPtr);
1891 }
1892 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1893 slot->SG[i].pAddr = 0;
1894 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1895 DEBUG((" SETTING %08lx to %x\n",
1896 (&slot->pSG[i].ins),
1897 slot->SG[i].ins));
1898 }
1899 slot->resume_offset = 0;
1900 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1901 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1902 NCR_700_start_command(SCp);
1903 return 0;
1904 }
1905
1906 STATIC DEF_SCSI_QCMD(NCR_700_queuecommand)
1907
1908 STATIC int
1909 NCR_700_abort(struct scsi_cmnd * SCp)
1910 {
1911 struct NCR_700_command_slot *slot;
1912
1913 scmd_printk(KERN_INFO, SCp,
1914 "New error handler wants to abort command\n\t");
1915 scsi_print_command(SCp);
1916
1917 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1918
1919 if(slot == NULL)
1920 /* no outstanding command to abort */
1921 return SUCCESS;
1922 if(SCp->cmnd[0] == TEST_UNIT_READY) {
1923 /* FIXME: This is because of a problem in the new
1924 * error handler. When it is in error recovery, it
1925 * will send a TUR to a device it thinks may still be
1926 * showing a problem. If the TUR isn't responded to,
1927 * it will abort it and mark the device off line.
1928 * Unfortunately, it does no other error recovery, so
1929 * this would leave us with an outstanding command
1930 * occupying a slot. Rather than allow this to
1931 * happen, we issue a bus reset to force all
1932 * outstanding commands to terminate here. */
1933 NCR_700_internal_bus_reset(SCp->device->host);
1934 /* still drop through and return failed */
1935 }
1936 return FAILED;
1937
1938 }
1939
1940 STATIC int
1941 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1942 {
1943 DECLARE_COMPLETION_ONSTACK(complete);
1944 struct NCR_700_Host_Parameters *hostdata =
1945 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1946
1947 scmd_printk(KERN_INFO, SCp,
1948 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1949 scsi_print_command(SCp);
1950
1951 /* In theory, eh_complete should always be null because the
1952 * eh is single threaded, but just in case we're handling a
1953 * reset via sg or something */
1954 spin_lock_irq(SCp->device->host->host_lock);
1955 while (hostdata->eh_complete != NULL) {
1956 spin_unlock_irq(SCp->device->host->host_lock);
1957 msleep_interruptible(100);
1958 spin_lock_irq(SCp->device->host->host_lock);
1959 }
1960
1961 hostdata->eh_complete = &complete;
1962 NCR_700_internal_bus_reset(SCp->device->host);
1963
1964 spin_unlock_irq(SCp->device->host->host_lock);
1965 wait_for_completion(&complete);
1966 spin_lock_irq(SCp->device->host->host_lock);
1967
1968 hostdata->eh_complete = NULL;
1969 /* Revalidate the transport parameters of the failing device */
1970 if(hostdata->fast)
1971 spi_schedule_dv_device(SCp->device);
1972
1973 spin_unlock_irq(SCp->device->host->host_lock);
1974 return SUCCESS;
1975 }
1976
1977 STATIC int
1978 NCR_700_host_reset(struct scsi_cmnd * SCp)
1979 {
1980 scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1981 scsi_print_command(SCp);
1982
1983 spin_lock_irq(SCp->device->host->host_lock);
1984
1985 NCR_700_internal_bus_reset(SCp->device->host);
1986 NCR_700_chip_reset(SCp->device->host);
1987
1988 spin_unlock_irq(SCp->device->host->host_lock);
1989
1990 return SUCCESS;
1991 }
1992
1993 STATIC void
1994 NCR_700_set_period(struct scsi_target *STp, int period)
1995 {
1996 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1997 struct NCR_700_Host_Parameters *hostdata =
1998 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
1999
2000 if(!hostdata->fast)
2001 return;
2002
2003 if(period < hostdata->min_period)
2004 period = hostdata->min_period;
2005
2006 spi_period(STp) = period;
2007 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2008 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2009 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2010 }
2011
2012 STATIC void
2013 NCR_700_set_offset(struct scsi_target *STp, int offset)
2014 {
2015 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2016 struct NCR_700_Host_Parameters *hostdata =
2017 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2018 int max_offset = hostdata->chip710
2019 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2020
2021 if(!hostdata->fast)
2022 return;
2023
2024 if(offset > max_offset)
2025 offset = max_offset;
2026
2027 /* if we're currently async, make sure the period is reasonable */
2028 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2029 spi_period(STp) > 0xff))
2030 spi_period(STp) = hostdata->min_period;
2031
2032 spi_offset(STp) = offset;
2033 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2034 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2035 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2036 }
2037
2038 STATIC int
2039 NCR_700_slave_alloc(struct scsi_device *SDp)
2040 {
2041 SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2042 GFP_KERNEL);
2043
2044 if (!SDp->hostdata)
2045 return -ENOMEM;
2046
2047 return 0;
2048 }
2049
2050 STATIC int
2051 NCR_700_slave_configure(struct scsi_device *SDp)
2052 {
2053 struct NCR_700_Host_Parameters *hostdata =
2054 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2055
2056 /* to do here: allocate memory; build a queue_full list */
2057 if(SDp->tagged_supported) {
2058 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2059 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2060 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2061 } else {
2062 /* initialise to default depth */
2063 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2064 }
2065 if(hostdata->fast) {
2066 /* Find the correct offset and period via domain validation */
2067 if (!spi_initial_dv(SDp->sdev_target))
2068 spi_dv_device(SDp);
2069 } else {
2070 spi_offset(SDp->sdev_target) = 0;
2071 spi_period(SDp->sdev_target) = 0;
2072 }
2073 return 0;
2074 }
2075
2076 STATIC void
2077 NCR_700_slave_destroy(struct scsi_device *SDp)
2078 {
2079 kfree(SDp->hostdata);
2080 SDp->hostdata = NULL;
2081 }
2082
2083 static int
2084 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth, int reason)
2085 {
2086 if (reason != SCSI_QDEPTH_DEFAULT)
2087 return -EOPNOTSUPP;
2088
2089 if (depth > NCR_700_MAX_TAGS)
2090 depth = NCR_700_MAX_TAGS;
2091
2092 scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2093 return depth;
2094 }
2095
2096 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2097 {
2098 int change_tag = ((tag_type ==0 && scsi_get_tag_type(SDp) != 0)
2099 || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2100 struct NCR_700_Host_Parameters *hostdata =
2101 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2102
2103 scsi_set_tag_type(SDp, tag_type);
2104
2105 /* We have a global (per target) flag to track whether TCQ is
2106 * enabled, so we'll be turning it off for the entire target here.
2107 * our tag algorithm will fail if we mix tagged and untagged commands,
2108 * so quiesce the device before doing this */
2109 if (change_tag)
2110 scsi_target_quiesce(SDp->sdev_target);
2111
2112 if (!tag_type) {
2113 /* shift back to the default unqueued number of commands
2114 * (the user can still raise this) */
2115 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2116 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
2117 } else {
2118 /* Here, we cleared the negotiation flag above, so this
2119 * will force the driver to renegotiate */
2120 scsi_activate_tcq(SDp, SDp->queue_depth);
2121 if (change_tag)
2122 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2123 }
2124 if (change_tag)
2125 scsi_target_resume(SDp->sdev_target);
2126
2127 return tag_type;
2128 }
2129
2130 static ssize_t
2131 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2132 {
2133 struct scsi_device *SDp = to_scsi_device(dev);
2134
2135 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2136 }
2137
2138 static struct device_attribute NCR_700_active_tags_attr = {
2139 .attr = {
2140 .name = "active_tags",
2141 .mode = S_IRUGO,
2142 },
2143 .show = NCR_700_show_active_tags,
2144 };
2145
2146 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2147 &NCR_700_active_tags_attr,
2148 NULL,
2149 };
2150
2151 EXPORT_SYMBOL(NCR_700_detect);
2152 EXPORT_SYMBOL(NCR_700_release);
2153 EXPORT_SYMBOL(NCR_700_intr);
2154
2155 static struct spi_function_template NCR_700_transport_functions = {
2156 .set_period = NCR_700_set_period,
2157 .show_period = 1,
2158 .set_offset = NCR_700_set_offset,
2159 .show_offset = 1,
2160 };
2161
2162 static int __init NCR_700_init(void)
2163 {
2164 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2165 if(!NCR_700_transport_template)
2166 return -ENODEV;
2167 return 0;
2168 }
2169
2170 static void __exit NCR_700_exit(void)
2171 {
2172 spi_release_transport(NCR_700_transport_template);
2173 }
2174
2175 module_init(NCR_700_init);
2176 module_exit(NCR_700_exit);
2177
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