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Merge tag 'xfs-4.13-merge-6' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
[mirror_ubuntu-artful-kernel.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/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);
179
180 STATIC struct device_attribute *NCR_700_dev_attrs[];
181
182 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
183
184 static char *NCR_700_phase[] = {
185 "",
186 "after selection",
187 "before command phase",
188 "after command phase",
189 "after status phase",
190 "after data in phase",
191 "after data out phase",
192 "during data phase",
193 };
194
195 static char *NCR_700_condition[] = {
196 "",
197 "NOT MSG_OUT",
198 "UNEXPECTED PHASE",
199 "NOT MSG_IN",
200 "UNEXPECTED MSG",
201 "MSG_IN",
202 "SDTR_MSG RECEIVED",
203 "REJECT_MSG RECEIVED",
204 "DISCONNECT_MSG RECEIVED",
205 "MSG_OUT",
206 "DATA_IN",
207
208 };
209
210 static char *NCR_700_fatal_messages[] = {
211 "unexpected message after reselection",
212 "still MSG_OUT after message injection",
213 "not MSG_IN after selection",
214 "Illegal message length received",
215 };
216
217 static char *NCR_700_SBCL_bits[] = {
218 "IO ",
219 "CD ",
220 "MSG ",
221 "ATN ",
222 "SEL ",
223 "BSY ",
224 "ACK ",
225 "REQ ",
226 };
227
228 static char *NCR_700_SBCL_to_phase[] = {
229 "DATA_OUT",
230 "DATA_IN",
231 "CMD_OUT",
232 "STATE",
233 "ILLEGAL PHASE",
234 "ILLEGAL PHASE",
235 "MSG OUT",
236 "MSG IN",
237 };
238
239 /* This translates the SDTR message offset and period to a value
240 * which can be loaded into the SXFER_REG.
241 *
242 * NOTE: According to SCSI-2, the true transfer period (in ns) is
243 * actually four times this period value */
244 static inline __u8
245 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
246 __u8 offset, __u8 period)
247 {
248 int XFERP;
249
250 __u8 min_xferp = (hostdata->chip710
251 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
252 __u8 max_offset = (hostdata->chip710
253 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
254
255 if(offset == 0)
256 return 0;
257
258 if(period < hostdata->min_period) {
259 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
260 period = hostdata->min_period;
261 }
262 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
263 if(offset > max_offset) {
264 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
265 offset, max_offset);
266 offset = max_offset;
267 }
268 if(XFERP < min_xferp) {
269 XFERP = min_xferp;
270 }
271 return (offset & 0x0f) | (XFERP & 0x07)<<4;
272 }
273
274 static inline __u8
275 NCR_700_get_SXFER(struct scsi_device *SDp)
276 {
277 struct NCR_700_Host_Parameters *hostdata =
278 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
279
280 return NCR_700_offset_period_to_sxfer(hostdata,
281 spi_offset(SDp->sdev_target),
282 spi_period(SDp->sdev_target));
283 }
284
285 struct Scsi_Host *
286 NCR_700_detect(struct scsi_host_template *tpnt,
287 struct NCR_700_Host_Parameters *hostdata, struct device *dev)
288 {
289 dma_addr_t pScript, pSlots;
290 __u8 *memory;
291 __u32 *script;
292 struct Scsi_Host *host;
293 static int banner = 0;
294 int j;
295
296 if(tpnt->sdev_attrs == NULL)
297 tpnt->sdev_attrs = NCR_700_dev_attrs;
298
299 memory = dma_alloc_attrs(hostdata->dev, TOTAL_MEM_SIZE, &pScript,
300 GFP_KERNEL, DMA_ATTR_NON_CONSISTENT);
301 if(memory == NULL) {
302 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detaching\n");
303 return NULL;
304 }
305
306 script = (__u32 *)memory;
307 hostdata->msgin = memory + MSGIN_OFFSET;
308 hostdata->msgout = memory + MSGOUT_OFFSET;
309 hostdata->status = memory + STATUS_OFFSET;
310 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
311 hostdata->dev = dev;
312
313 pSlots = pScript + SLOTS_OFFSET;
314
315 /* Fill in the missing routines from the host template */
316 tpnt->queuecommand = NCR_700_queuecommand;
317 tpnt->eh_abort_handler = NCR_700_abort;
318 tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
319 tpnt->eh_host_reset_handler = NCR_700_host_reset;
320 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
321 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
322 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
323 tpnt->use_clustering = ENABLE_CLUSTERING;
324 tpnt->slave_configure = NCR_700_slave_configure;
325 tpnt->slave_destroy = NCR_700_slave_destroy;
326 tpnt->slave_alloc = NCR_700_slave_alloc;
327 tpnt->change_queue_depth = NCR_700_change_queue_depth;
328
329 if(tpnt->name == NULL)
330 tpnt->name = "53c700";
331 if(tpnt->proc_name == NULL)
332 tpnt->proc_name = "53c700";
333
334 host = scsi_host_alloc(tpnt, 4);
335 if (!host)
336 return NULL;
337 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
338 * NCR_700_COMMAND_SLOTS_PER_HOST);
339 for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
340 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
341 - (unsigned long)&hostdata->slots[0].SG[0]);
342 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
343 if(j == 0)
344 hostdata->free_list = &hostdata->slots[j];
345 else
346 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
347 hostdata->slots[j].state = NCR_700_SLOT_FREE;
348 }
349
350 for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
351 script[j] = bS_to_host(SCRIPT[j]);
352
353 /* adjust all labels to be bus physical */
354 for (j = 0; j < PATCHES; j++)
355 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
356 /* now patch up fixed addresses. */
357 script_patch_32(hostdata->dev, script, MessageLocation,
358 pScript + MSGOUT_OFFSET);
359 script_patch_32(hostdata->dev, script, StatusAddress,
360 pScript + STATUS_OFFSET);
361 script_patch_32(hostdata->dev, script, ReceiveMsgAddress,
362 pScript + MSGIN_OFFSET);
363
364 hostdata->script = script;
365 hostdata->pScript = pScript;
366 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
367 hostdata->state = NCR_700_HOST_FREE;
368 hostdata->cmd = NULL;
369 host->max_id = 8;
370 host->max_lun = NCR_700_MAX_LUNS;
371 BUG_ON(NCR_700_transport_template == NULL);
372 host->transportt = NCR_700_transport_template;
373 host->unique_id = (unsigned long)hostdata->base;
374 hostdata->eh_complete = NULL;
375 host->hostdata[0] = (unsigned long)hostdata;
376 /* kick the chip */
377 NCR_700_writeb(0xff, host, CTEST9_REG);
378 if (hostdata->chip710)
379 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
380 else
381 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
382 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
383 if (banner == 0) {
384 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
385 banner = 1;
386 }
387 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
388 hostdata->chip710 ? "53c710" :
389 (hostdata->fast ? "53c700-66" : "53c700"),
390 hostdata->rev, hostdata->differential ?
391 "(Differential)" : "");
392 /* reset the chip */
393 NCR_700_chip_reset(host);
394
395 if (scsi_add_host(host, dev)) {
396 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
397 scsi_host_put(host);
398 return NULL;
399 }
400
401 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
402 SPI_SIGNAL_SE;
403
404 return host;
405 }
406
407 int
408 NCR_700_release(struct Scsi_Host *host)
409 {
410 struct NCR_700_Host_Parameters *hostdata =
411 (struct NCR_700_Host_Parameters *)host->hostdata[0];
412
413 dma_free_attrs(hostdata->dev, TOTAL_MEM_SIZE, hostdata->script,
414 hostdata->pScript, DMA_ATTR_NON_CONSISTENT);
415 return 1;
416 }
417
418 static inline __u8
419 NCR_700_identify(int can_disconnect, __u8 lun)
420 {
421 return IDENTIFY_BASE |
422 ((can_disconnect) ? 0x40 : 0) |
423 (lun & NCR_700_LUN_MASK);
424 }
425
426 /*
427 * Function : static int data_residual (Scsi_Host *host)
428 *
429 * Purpose : return residual data count of what's in the chip. If you
430 * really want to know what this function is doing, it's almost a
431 * direct transcription of the algorithm described in the 53c710
432 * guide, except that the DBC and DFIFO registers are only 6 bits
433 * wide on a 53c700.
434 *
435 * Inputs : host - SCSI host */
436 static inline int
437 NCR_700_data_residual (struct Scsi_Host *host) {
438 struct NCR_700_Host_Parameters *hostdata =
439 (struct NCR_700_Host_Parameters *)host->hostdata[0];
440 int count, synchronous = 0;
441 unsigned int ddir;
442
443 if(hostdata->chip710) {
444 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
445 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
446 } else {
447 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
448 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
449 }
450
451 if(hostdata->fast)
452 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
453
454 /* get the data direction */
455 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
456
457 if (ddir) {
458 /* Receive */
459 if (synchronous)
460 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
461 else
462 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
463 ++count;
464 } else {
465 /* Send */
466 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
467 if (sstat & SODL_REG_FULL)
468 ++count;
469 if (synchronous && (sstat & SODR_REG_FULL))
470 ++count;
471 }
472 #ifdef NCR_700_DEBUG
473 if(count)
474 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
475 #endif
476 return count;
477 }
478
479 /* print out the SCSI wires and corresponding phase from the SBCL register
480 * in the chip */
481 static inline char *
482 sbcl_to_string(__u8 sbcl)
483 {
484 int i;
485 static char ret[256];
486
487 ret[0]='\0';
488 for(i=0; i<8; i++) {
489 if((1<<i) & sbcl)
490 strcat(ret, NCR_700_SBCL_bits[i]);
491 }
492 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
493 return ret;
494 }
495
496 static inline __u8
497 bitmap_to_number(__u8 bitmap)
498 {
499 __u8 i;
500
501 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
502 ;
503 return i;
504 }
505
506 /* Pull a slot off the free list */
507 STATIC struct NCR_700_command_slot *
508 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
509 {
510 struct NCR_700_command_slot *slot = hostdata->free_list;
511
512 if(slot == NULL) {
513 /* sanity check */
514 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
515 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
516 return NULL;
517 }
518
519 if(slot->state != NCR_700_SLOT_FREE)
520 /* should panic! */
521 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
522
523
524 hostdata->free_list = slot->ITL_forw;
525 slot->ITL_forw = NULL;
526
527
528 /* NOTE: set the state to busy here, not queued, since this
529 * indicates the slot is in use and cannot be run by the IRQ
530 * finish routine. If we cannot queue the command when it
531 * is properly build, we then change to NCR_700_SLOT_QUEUED */
532 slot->state = NCR_700_SLOT_BUSY;
533 slot->flags = 0;
534 hostdata->command_slot_count++;
535
536 return slot;
537 }
538
539 STATIC void
540 free_slot(struct NCR_700_command_slot *slot,
541 struct NCR_700_Host_Parameters *hostdata)
542 {
543 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
544 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
545 }
546 if(slot->state == NCR_700_SLOT_FREE) {
547 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
548 }
549
550 slot->resume_offset = 0;
551 slot->cmnd = NULL;
552 slot->state = NCR_700_SLOT_FREE;
553 slot->ITL_forw = hostdata->free_list;
554 hostdata->free_list = slot;
555 hostdata->command_slot_count--;
556 }
557
558
559 /* This routine really does very little. The command is indexed on
560 the ITL and (if tagged) the ITLQ lists in _queuecommand */
561 STATIC void
562 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
563 struct scsi_cmnd *SCp, __u32 dsp)
564 {
565 /* Its just possible that this gets executed twice */
566 if(SCp != NULL) {
567 struct NCR_700_command_slot *slot =
568 (struct NCR_700_command_slot *)SCp->host_scribble;
569
570 slot->resume_offset = dsp;
571 }
572 hostdata->state = NCR_700_HOST_FREE;
573 hostdata->cmd = NULL;
574 }
575
576 STATIC inline void
577 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
578 struct NCR_700_command_slot *slot)
579 {
580 if(SCp->sc_data_direction != DMA_NONE &&
581 SCp->sc_data_direction != DMA_BIDIRECTIONAL)
582 scsi_dma_unmap(SCp);
583 }
584
585 STATIC inline void
586 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
587 struct scsi_cmnd *SCp, int result)
588 {
589 hostdata->state = NCR_700_HOST_FREE;
590 hostdata->cmd = NULL;
591
592 if(SCp != NULL) {
593 struct NCR_700_command_slot *slot =
594 (struct NCR_700_command_slot *)SCp->host_scribble;
595
596 dma_unmap_single(hostdata->dev, slot->pCmd,
597 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
598 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
599 char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
600
601 dma_unmap_single(hostdata->dev, slot->dma_handle,
602 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
603 /* restore the old result if the request sense was
604 * successful */
605 if (result == 0)
606 result = cmnd[7];
607 /* restore the original length */
608 SCp->cmd_len = cmnd[8];
609 } else
610 NCR_700_unmap(hostdata, SCp, slot);
611
612 free_slot(slot, hostdata);
613 #ifdef NCR_700_DEBUG
614 if(NCR_700_get_depth(SCp->device) == 0 ||
615 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
616 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
617 NCR_700_get_depth(SCp->device));
618 #endif /* NCR_700_DEBUG */
619 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
620
621 SCp->host_scribble = NULL;
622 SCp->result = result;
623 SCp->scsi_done(SCp);
624 } else {
625 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
626 }
627 }
628
629
630 STATIC void
631 NCR_700_internal_bus_reset(struct Scsi_Host *host)
632 {
633 /* Bus reset */
634 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
635 udelay(50);
636 NCR_700_writeb(0, host, SCNTL1_REG);
637
638 }
639
640 STATIC void
641 NCR_700_chip_setup(struct Scsi_Host *host)
642 {
643 struct NCR_700_Host_Parameters *hostdata =
644 (struct NCR_700_Host_Parameters *)host->hostdata[0];
645 __u8 min_period;
646 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
647
648 if(hostdata->chip710) {
649 __u8 burst_disable = 0;
650 __u8 burst_length = 0;
651
652 switch (hostdata->burst_length) {
653 case 1:
654 burst_length = BURST_LENGTH_1;
655 break;
656 case 2:
657 burst_length = BURST_LENGTH_2;
658 break;
659 case 4:
660 burst_length = BURST_LENGTH_4;
661 break;
662 case 8:
663 burst_length = BURST_LENGTH_8;
664 break;
665 default:
666 burst_disable = BURST_DISABLE;
667 break;
668 }
669 hostdata->dcntl_extra |= COMPAT_700_MODE;
670
671 NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);
672 NCR_700_writeb(burst_length | hostdata->dmode_extra,
673 host, DMODE_710_REG);
674 NCR_700_writeb(burst_disable | hostdata->ctest7_extra |
675 (hostdata->differential ? DIFF : 0),
676 host, CTEST7_REG);
677 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
678 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
679 | AUTO_ATN, host, SCNTL0_REG);
680 } else {
681 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
682 host, DMODE_700_REG);
683 NCR_700_writeb(hostdata->differential ?
684 DIFF : 0, host, CTEST7_REG);
685 if(hostdata->fast) {
686 /* this is for 700-66, does nothing on 700 */
687 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
688 | GENERATE_RECEIVE_PARITY, host,
689 CTEST8_REG);
690 } else {
691 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
692 | PARITY | AUTO_ATN, host, SCNTL0_REG);
693 }
694 }
695
696 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
697 NCR_700_writeb(0, host, SBCL_REG);
698 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
699
700 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
701 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
702
703 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
704 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
705 if(hostdata->clock > 75) {
706 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
707 /* do the best we can, but the async clock will be out
708 * of spec: sync divider 2, async divider 3 */
709 DEBUG(("53c700: sync 2 async 3\n"));
710 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
711 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
712 hostdata->sync_clock = hostdata->clock/2;
713 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
714 /* sync divider 1.5, async divider 3 */
715 DEBUG(("53c700: sync 1.5 async 3\n"));
716 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
717 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
718 hostdata->sync_clock = hostdata->clock*2;
719 hostdata->sync_clock /= 3;
720
721 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
722 /* sync divider 1, async divider 2 */
723 DEBUG(("53c700: sync 1 async 2\n"));
724 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
725 NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);
726 hostdata->sync_clock = hostdata->clock;
727 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
728 /* sync divider 1, async divider 1.5 */
729 DEBUG(("53c700: sync 1 async 1.5\n"));
730 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
731 NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);
732 hostdata->sync_clock = hostdata->clock;
733 } else {
734 DEBUG(("53c700: sync 1 async 1\n"));
735 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
736 NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);
737 /* sync divider 1, async divider 1 */
738 hostdata->sync_clock = hostdata->clock;
739 }
740 /* Calculate the actual minimum period that can be supported
741 * by our synchronous clock speed. See the 710 manual for
742 * exact details of this calculation which is based on a
743 * setting of the SXFER register */
744 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
745 hostdata->min_period = NCR_700_MIN_PERIOD;
746 if(min_period > NCR_700_MIN_PERIOD)
747 hostdata->min_period = min_period;
748 }
749
750 STATIC void
751 NCR_700_chip_reset(struct Scsi_Host *host)
752 {
753 struct NCR_700_Host_Parameters *hostdata =
754 (struct NCR_700_Host_Parameters *)host->hostdata[0];
755 if(hostdata->chip710) {
756 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
757 udelay(100);
758
759 NCR_700_writeb(0, host, ISTAT_REG);
760 } else {
761 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
762 udelay(100);
763
764 NCR_700_writeb(0, host, DCNTL_REG);
765 }
766
767 mdelay(1000);
768
769 NCR_700_chip_setup(host);
770 }
771
772 /* The heart of the message processing engine is that the instruction
773 * immediately after the INT is the normal case (and so must be CLEAR
774 * ACK). If we want to do something else, we call that routine in
775 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
776 * ACK) so that the routine returns correctly to resume its activity
777 * */
778 STATIC __u32
779 process_extended_message(struct Scsi_Host *host,
780 struct NCR_700_Host_Parameters *hostdata,
781 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
782 {
783 __u32 resume_offset = dsp, temp = dsp + 8;
784 __u8 pun = 0xff, lun = 0xff;
785
786 if(SCp != NULL) {
787 pun = SCp->device->id;
788 lun = SCp->device->lun;
789 }
790
791 switch(hostdata->msgin[2]) {
792 case A_SDTR_MSG:
793 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
794 struct scsi_target *starget = SCp->device->sdev_target;
795 __u8 period = hostdata->msgin[3];
796 __u8 offset = hostdata->msgin[4];
797
798 if(offset == 0 || period == 0) {
799 offset = 0;
800 period = 0;
801 }
802
803 spi_offset(starget) = offset;
804 spi_period(starget) = period;
805
806 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
807 spi_display_xfer_agreement(starget);
808 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
809 }
810
811 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
812 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
813
814 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
815 host, SXFER_REG);
816
817 } else {
818 /* SDTR message out of the blue, reject it */
819 shost_printk(KERN_WARNING, host,
820 "Unexpected SDTR msg\n");
821 hostdata->msgout[0] = A_REJECT_MSG;
822 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
823 script_patch_16(hostdata->dev, hostdata->script,
824 MessageCount, 1);
825 /* SendMsgOut returns, so set up the return
826 * address */
827 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
828 }
829 break;
830
831 case A_WDTR_MSG:
832 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
833 host->host_no, pun, lun);
834 hostdata->msgout[0] = A_REJECT_MSG;
835 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
836 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
837 1);
838 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
839
840 break;
841
842 default:
843 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
844 host->host_no, pun, lun,
845 NCR_700_phase[(dsps & 0xf00) >> 8]);
846 spi_print_msg(hostdata->msgin);
847 printk("\n");
848 /* just reject it */
849 hostdata->msgout[0] = A_REJECT_MSG;
850 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
851 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
852 1);
853 /* SendMsgOut returns, so set up the return
854 * address */
855 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
856 }
857 NCR_700_writel(temp, host, TEMP_REG);
858 return resume_offset;
859 }
860
861 STATIC __u32
862 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
863 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
864 {
865 /* work out where to return to */
866 __u32 temp = dsp + 8, resume_offset = dsp;
867 __u8 pun = 0xff, lun = 0xff;
868
869 if(SCp != NULL) {
870 pun = SCp->device->id;
871 lun = SCp->device->lun;
872 }
873
874 #ifdef NCR_700_DEBUG
875 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
876 NCR_700_phase[(dsps & 0xf00) >> 8]);
877 spi_print_msg(hostdata->msgin);
878 printk("\n");
879 #endif
880
881 switch(hostdata->msgin[0]) {
882
883 case A_EXTENDED_MSG:
884 resume_offset = process_extended_message(host, hostdata, SCp,
885 dsp, dsps);
886 break;
887
888 case A_REJECT_MSG:
889 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
890 /* Rejected our sync negotiation attempt */
891 spi_period(SCp->device->sdev_target) =
892 spi_offset(SCp->device->sdev_target) = 0;
893 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
894 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
895 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
896 /* rejected our first simple tag message */
897 scmd_printk(KERN_WARNING, SCp,
898 "Rejected first tag queue attempt, turning off tag queueing\n");
899 /* we're done negotiating */
900 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
901 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
902
903 SCp->device->tagged_supported = 0;
904 SCp->device->simple_tags = 0;
905 scsi_change_queue_depth(SCp->device, host->cmd_per_lun);
906 } else {
907 shost_printk(KERN_WARNING, host,
908 "(%d:%d) Unexpected REJECT Message %s\n",
909 pun, lun,
910 NCR_700_phase[(dsps & 0xf00) >> 8]);
911 /* however, just ignore it */
912 }
913 break;
914
915 case A_PARITY_ERROR_MSG:
916 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
917 pun, lun);
918 NCR_700_internal_bus_reset(host);
919 break;
920 case A_SIMPLE_TAG_MSG:
921 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
922 pun, lun, hostdata->msgin[1],
923 NCR_700_phase[(dsps & 0xf00) >> 8]);
924 /* just ignore it */
925 break;
926 default:
927 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
928 host->host_no, pun, lun,
929 NCR_700_phase[(dsps & 0xf00) >> 8]);
930
931 spi_print_msg(hostdata->msgin);
932 printk("\n");
933 /* just reject it */
934 hostdata->msgout[0] = A_REJECT_MSG;
935 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
936 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
937 1);
938 /* SendMsgOut returns, so set up the return
939 * address */
940 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
941
942 break;
943 }
944 NCR_700_writel(temp, host, TEMP_REG);
945 /* set us up to receive another message */
946 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
947 return resume_offset;
948 }
949
950 STATIC __u32
951 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
952 struct Scsi_Host *host,
953 struct NCR_700_Host_Parameters *hostdata)
954 {
955 __u32 resume_offset = 0;
956 __u8 pun = 0xff, lun=0xff;
957
958 if(SCp != NULL) {
959 pun = SCp->device->id;
960 lun = SCp->device->lun;
961 }
962
963 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
964 DEBUG((" COMMAND COMPLETE, status=%02x\n",
965 hostdata->status[0]));
966 /* OK, if TCQ still under negotiation, we now know it works */
967 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
968 NCR_700_set_tag_neg_state(SCp->device,
969 NCR_700_FINISHED_TAG_NEGOTIATION);
970
971 /* check for contingent allegiance contitions */
972 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
973 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
974 struct NCR_700_command_slot *slot =
975 (struct NCR_700_command_slot *)SCp->host_scribble;
976 if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
977 /* OOPS: bad device, returning another
978 * contingent allegiance condition */
979 scmd_printk(KERN_ERR, SCp,
980 "broken device is looping in contingent allegiance: ignoring\n");
981 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
982 } else {
983 char *cmnd =
984 NCR_700_get_sense_cmnd(SCp->device);
985 #ifdef NCR_DEBUG
986 scsi_print_command(SCp);
987 printk(" cmd %p has status %d, requesting sense\n",
988 SCp, hostdata->status[0]);
989 #endif
990 /* we can destroy the command here
991 * because the contingent allegiance
992 * condition will cause a retry which
993 * will re-copy the command from the
994 * saved data_cmnd. We also unmap any
995 * data associated with the command
996 * here */
997 NCR_700_unmap(hostdata, SCp, slot);
998 dma_unmap_single(hostdata->dev, slot->pCmd,
999 MAX_COMMAND_SIZE,
1000 DMA_TO_DEVICE);
1001
1002 cmnd[0] = REQUEST_SENSE;
1003 cmnd[1] = (lun & 0x7) << 5;
1004 cmnd[2] = 0;
1005 cmnd[3] = 0;
1006 cmnd[4] = SCSI_SENSE_BUFFERSIZE;
1007 cmnd[5] = 0;
1008 /* Here's a quiet hack: the
1009 * REQUEST_SENSE command is six bytes,
1010 * so store a flag indicating that
1011 * this was an internal sense request
1012 * and the original status at the end
1013 * of the command */
1014 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1015 cmnd[7] = hostdata->status[0];
1016 cmnd[8] = SCp->cmd_len;
1017 SCp->cmd_len = 6; /* command length for
1018 * REQUEST_SENSE */
1019 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1020 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1021 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | SCSI_SENSE_BUFFERSIZE);
1022 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1023 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1024 slot->SG[1].pAddr = 0;
1025 slot->resume_offset = hostdata->pScript;
1026 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1027 dma_cache_sync(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1028
1029 /* queue the command for reissue */
1030 slot->state = NCR_700_SLOT_QUEUED;
1031 slot->flags = NCR_700_FLAG_AUTOSENSE;
1032 hostdata->state = NCR_700_HOST_FREE;
1033 hostdata->cmd = NULL;
1034 }
1035 } else {
1036 // Currently rely on the mid layer evaluation
1037 // of the tag queuing capability
1038 //
1039 //if(status_byte(hostdata->status[0]) == GOOD &&
1040 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1041 // /* Piggy back the tag queueing support
1042 // * on this command */
1043 // dma_sync_single_for_cpu(hostdata->dev,
1044 // slot->dma_handle,
1045 // SCp->request_bufflen,
1046 // DMA_FROM_DEVICE);
1047 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1048 // scmd_printk(KERN_INFO, SCp,
1049 // "Enabling Tag Command Queuing\n");
1050 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1051 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1052 // } else {
1053 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1054 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1055 // }
1056 //}
1057 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1058 }
1059 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1060 __u8 i = (dsps & 0xf00) >> 8;
1061
1062 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1063 NCR_700_phase[i],
1064 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1065 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =",
1066 SCp->cmd_len);
1067 scsi_print_command(SCp);
1068
1069 NCR_700_internal_bus_reset(host);
1070 } else if((dsps & 0xfffff000) == A_FATAL) {
1071 int i = (dsps & 0xfff);
1072
1073 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1074 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1075 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1076 printk(KERN_ERR " msg begins %02x %02x\n",
1077 hostdata->msgin[0], hostdata->msgin[1]);
1078 }
1079 NCR_700_internal_bus_reset(host);
1080 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1081 #ifdef NCR_700_DEBUG
1082 __u8 i = (dsps & 0xf00) >> 8;
1083
1084 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1085 host->host_no, pun, lun,
1086 i, NCR_700_phase[i]);
1087 #endif
1088 save_for_reselection(hostdata, SCp, dsp);
1089
1090 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1091 __u8 lun;
1092 struct NCR_700_command_slot *slot;
1093 __u8 reselection_id = hostdata->reselection_id;
1094 struct scsi_device *SDp;
1095
1096 lun = hostdata->msgin[0] & 0x1f;
1097
1098 hostdata->reselection_id = 0xff;
1099 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1100 host->host_no, reselection_id, lun));
1101 /* clear the reselection indicator */
1102 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1103 if(unlikely(SDp == NULL)) {
1104 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1105 host->host_no, reselection_id, lun);
1106 BUG();
1107 }
1108 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1109 struct scsi_cmnd *SCp;
1110
1111 SCp = scsi_host_find_tag(SDp->host, hostdata->msgin[2]);
1112 if(unlikely(SCp == NULL)) {
1113 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1114 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1115 BUG();
1116 }
1117
1118 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1119 DDEBUG(KERN_DEBUG, SDp,
1120 "reselection is tag %d, slot %p(%d)\n",
1121 hostdata->msgin[2], slot, slot->tag);
1122 } else {
1123 struct NCR_700_Device_Parameters *p = SDp->hostdata;
1124 struct scsi_cmnd *SCp = p->current_cmnd;
1125
1126 if(unlikely(SCp == NULL)) {
1127 sdev_printk(KERN_ERR, SDp,
1128 "no saved request for untagged cmd\n");
1129 BUG();
1130 }
1131 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1132 }
1133
1134 if(slot == NULL) {
1135 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1136 host->host_no, reselection_id, lun,
1137 hostdata->msgin[0], hostdata->msgin[1],
1138 hostdata->msgin[2]);
1139 } else {
1140 if(hostdata->state != NCR_700_HOST_BUSY)
1141 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1142 host->host_no);
1143 resume_offset = slot->resume_offset;
1144 hostdata->cmd = slot->cmnd;
1145
1146 /* re-patch for this command */
1147 script_patch_32_abs(hostdata->dev, hostdata->script,
1148 CommandAddress, slot->pCmd);
1149 script_patch_16(hostdata->dev, hostdata->script,
1150 CommandCount, slot->cmnd->cmd_len);
1151 script_patch_32_abs(hostdata->dev, hostdata->script,
1152 SGScriptStartAddress,
1153 to32bit(&slot->pSG[0].ins));
1154
1155 /* Note: setting SXFER only works if we're
1156 * still in the MESSAGE phase, so it is vital
1157 * that ACK is still asserted when we process
1158 * the reselection message. The resume offset
1159 * should therefore always clear ACK */
1160 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1161 host, SXFER_REG);
1162 dma_cache_sync(hostdata->dev, hostdata->msgin,
1163 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1164 dma_cache_sync(hostdata->dev, hostdata->msgout,
1165 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1166 /* I'm just being paranoid here, the command should
1167 * already have been flushed from the cache */
1168 dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
1169 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1170
1171
1172
1173 }
1174 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1175
1176 /* This section is full of debugging code because I've
1177 * never managed to reach it. I think what happens is
1178 * that, because the 700 runs with selection
1179 * interrupts enabled the whole time that we take a
1180 * selection interrupt before we manage to get to the
1181 * reselected script interrupt */
1182
1183 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1184 struct NCR_700_command_slot *slot;
1185
1186 /* Take out our own ID */
1187 reselection_id &= ~(1<<host->this_id);
1188
1189 /* I've never seen this happen, so keep this as a printk rather
1190 * than a debug */
1191 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1192 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1193
1194 {
1195 /* FIXME: DEBUGGING CODE */
1196 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1197 int i;
1198
1199 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1200 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1201 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1202 break;
1203 }
1204 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);
1205 SCp = hostdata->slots[i].cmnd;
1206 }
1207
1208 if(SCp != NULL) {
1209 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1210 /* change slot from busy to queued to redo command */
1211 slot->state = NCR_700_SLOT_QUEUED;
1212 }
1213 hostdata->cmd = NULL;
1214
1215 if(reselection_id == 0) {
1216 if(hostdata->reselection_id == 0xff) {
1217 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1218 return 0;
1219 } else {
1220 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1221 host->host_no);
1222 reselection_id = hostdata->reselection_id;
1223 }
1224 } else {
1225
1226 /* convert to real ID */
1227 reselection_id = bitmap_to_number(reselection_id);
1228 }
1229 hostdata->reselection_id = reselection_id;
1230 /* just in case we have a stale simple tag message, clear it */
1231 hostdata->msgin[1] = 0;
1232 dma_cache_sync(hostdata->dev, hostdata->msgin,
1233 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1234 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1235 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1236 } else {
1237 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1238 }
1239 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1240 /* we've just disconnected from the bus, do nothing since
1241 * a return here will re-run the queued command slot
1242 * that may have been interrupted by the initial selection */
1243 DEBUG((" SELECTION COMPLETED\n"));
1244 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1245 resume_offset = process_message(host, hostdata, SCp,
1246 dsp, dsps);
1247 } else if((dsps & 0xfffff000) == 0) {
1248 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1249 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1250 host->host_no, pun, lun, NCR_700_condition[i],
1251 NCR_700_phase[j], dsp - hostdata->pScript);
1252 if(SCp != NULL) {
1253 struct scatterlist *sg;
1254
1255 scsi_print_command(SCp);
1256 scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {
1257 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);
1258 }
1259 }
1260 NCR_700_internal_bus_reset(host);
1261 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1262 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1263 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1264 resume_offset = dsp;
1265 } else {
1266 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1267 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1268 NCR_700_internal_bus_reset(host);
1269 }
1270 return resume_offset;
1271 }
1272
1273 /* We run the 53c700 with selection interrupts always enabled. This
1274 * means that the chip may be selected as soon as the bus frees. On a
1275 * busy bus, this can be before the scripts engine finishes its
1276 * processing. Therefore, part of the selection processing has to be
1277 * to find out what the scripts engine is doing and complete the
1278 * function if necessary (i.e. process the pending disconnect or save
1279 * the interrupted initial selection */
1280 STATIC inline __u32
1281 process_selection(struct Scsi_Host *host, __u32 dsp)
1282 {
1283 __u8 id = 0; /* Squash compiler warning */
1284 int count = 0;
1285 __u32 resume_offset = 0;
1286 struct NCR_700_Host_Parameters *hostdata =
1287 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1288 struct scsi_cmnd *SCp = hostdata->cmd;
1289 __u8 sbcl;
1290
1291 for(count = 0; count < 5; count++) {
1292 id = NCR_700_readb(host, hostdata->chip710 ?
1293 CTEST9_REG : SFBR_REG);
1294
1295 /* Take out our own ID */
1296 id &= ~(1<<host->this_id);
1297 if(id != 0)
1298 break;
1299 udelay(5);
1300 }
1301 sbcl = NCR_700_readb(host, SBCL_REG);
1302 if((sbcl & SBCL_IO) == 0) {
1303 /* mark as having been selected rather than reselected */
1304 id = 0xff;
1305 } else {
1306 /* convert to real ID */
1307 hostdata->reselection_id = id = bitmap_to_number(id);
1308 DEBUG(("scsi%d: Reselected by %d\n",
1309 host->host_no, id));
1310 }
1311 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1312 struct NCR_700_command_slot *slot =
1313 (struct NCR_700_command_slot *)SCp->host_scribble;
1314 DEBUG((" ID %d WARNING: RESELECTION OF BUSY HOST, saving cmd %p, slot %p, addr %x [%04x], resume %x!\n", id, hostdata->cmd, slot, dsp, dsp - hostdata->pScript, resume_offset));
1315
1316 switch(dsp - hostdata->pScript) {
1317 case Ent_Disconnect1:
1318 case Ent_Disconnect2:
1319 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1320 break;
1321 case Ent_Disconnect3:
1322 case Ent_Disconnect4:
1323 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1324 break;
1325 case Ent_Disconnect5:
1326 case Ent_Disconnect6:
1327 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1328 break;
1329 case Ent_Disconnect7:
1330 case Ent_Disconnect8:
1331 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1332 break;
1333 case Ent_Finish1:
1334 case Ent_Finish2:
1335 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1336 break;
1337
1338 default:
1339 slot->state = NCR_700_SLOT_QUEUED;
1340 break;
1341 }
1342 }
1343 hostdata->state = NCR_700_HOST_BUSY;
1344 hostdata->cmd = NULL;
1345 /* clear any stale simple tag message */
1346 hostdata->msgin[1] = 0;
1347 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1348 DMA_BIDIRECTIONAL);
1349
1350 if(id == 0xff) {
1351 /* Selected as target, Ignore */
1352 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1353 } else if(hostdata->tag_negotiated & (1<<id)) {
1354 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1355 } else {
1356 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1357 }
1358 return resume_offset;
1359 }
1360
1361 static inline void
1362 NCR_700_clear_fifo(struct Scsi_Host *host) {
1363 const struct NCR_700_Host_Parameters *hostdata
1364 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1365 if(hostdata->chip710) {
1366 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1367 } else {
1368 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1369 }
1370 }
1371
1372 static inline void
1373 NCR_700_flush_fifo(struct Scsi_Host *host) {
1374 const struct NCR_700_Host_Parameters *hostdata
1375 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1376 if(hostdata->chip710) {
1377 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1378 udelay(10);
1379 NCR_700_writeb(0, host, CTEST8_REG);
1380 } else {
1381 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1382 udelay(10);
1383 NCR_700_writeb(0, host, DFIFO_REG);
1384 }
1385 }
1386
1387
1388 /* The queue lock with interrupts disabled must be held on entry to
1389 * this function */
1390 STATIC int
1391 NCR_700_start_command(struct scsi_cmnd *SCp)
1392 {
1393 struct NCR_700_command_slot *slot =
1394 (struct NCR_700_command_slot *)SCp->host_scribble;
1395 struct NCR_700_Host_Parameters *hostdata =
1396 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1397 __u16 count = 1; /* for IDENTIFY message */
1398 u8 lun = SCp->device->lun;
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 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 += spi_populate_tag_msg(&hostdata->msgout[count], SCp);
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 || !(SCp->flags & SCMD_TAGGED))) {
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 ((SCp->flags & SCMD_TAGGED)
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 (!(SCp->flags & SCMD_TAGGED)
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 SCp->device->simple_tags) {
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 struct NCR_700_Device_Parameters *p = SCp->device->hostdata;
1829
1830 slot->tag = SCSI_NO_TAG;
1831 /* save current command for reselection */
1832 p->current_cmnd = SCp;
1833 }
1834 /* sanity check: some of the commands generated by the mid-layer
1835 * have an eccentric idea of their sc_data_direction */
1836 if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
1837 SCp->sc_data_direction != DMA_NONE) {
1838 #ifdef NCR_700_DEBUG
1839 printk("53c700: Command");
1840 scsi_print_command(SCp);
1841 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1842 #endif
1843 SCp->sc_data_direction = DMA_NONE;
1844 }
1845
1846 switch (SCp->cmnd[0]) {
1847 case REQUEST_SENSE:
1848 /* clear the internal sense magic */
1849 SCp->cmnd[6] = 0;
1850 /* fall through */
1851 default:
1852 /* OK, get it from the command */
1853 switch(SCp->sc_data_direction) {
1854 case DMA_BIDIRECTIONAL:
1855 default:
1856 printk(KERN_ERR "53c700: Unknown command for data direction ");
1857 scsi_print_command(SCp);
1858
1859 move_ins = 0;
1860 break;
1861 case DMA_NONE:
1862 move_ins = 0;
1863 break;
1864 case DMA_FROM_DEVICE:
1865 move_ins = SCRIPT_MOVE_DATA_IN;
1866 break;
1867 case DMA_TO_DEVICE:
1868 move_ins = SCRIPT_MOVE_DATA_OUT;
1869 break;
1870 }
1871 }
1872
1873 /* now build the scatter gather list */
1874 direction = SCp->sc_data_direction;
1875 if(move_ins != 0) {
1876 int i;
1877 int sg_count;
1878 dma_addr_t vPtr = 0;
1879 struct scatterlist *sg;
1880 __u32 count = 0;
1881
1882 sg_count = scsi_dma_map(SCp);
1883 BUG_ON(sg_count < 0);
1884
1885 scsi_for_each_sg(SCp, sg, sg_count, i) {
1886 vPtr = sg_dma_address(sg);
1887 count = sg_dma_len(sg);
1888
1889 slot->SG[i].ins = bS_to_host(move_ins | count);
1890 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1891 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1892 slot->SG[i].pAddr = bS_to_host(vPtr);
1893 }
1894 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1895 slot->SG[i].pAddr = 0;
1896 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1897 DEBUG((" SETTING %p to %x\n",
1898 (&slot->pSG[i].ins),
1899 slot->SG[i].ins));
1900 }
1901 slot->resume_offset = 0;
1902 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1903 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1904 NCR_700_start_command(SCp);
1905 return 0;
1906 }
1907
1908 STATIC DEF_SCSI_QCMD(NCR_700_queuecommand)
1909
1910 STATIC int
1911 NCR_700_abort(struct scsi_cmnd * SCp)
1912 {
1913 struct NCR_700_command_slot *slot;
1914
1915 scmd_printk(KERN_INFO, SCp, "abort command\n");
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_change_queue_depth(SDp, NCR_700_DEFAULT_TAGS);
2059 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2060 }
2061
2062 if(hostdata->fast) {
2063 /* Find the correct offset and period via domain validation */
2064 if (!spi_initial_dv(SDp->sdev_target))
2065 spi_dv_device(SDp);
2066 } else {
2067 spi_offset(SDp->sdev_target) = 0;
2068 spi_period(SDp->sdev_target) = 0;
2069 }
2070 return 0;
2071 }
2072
2073 STATIC void
2074 NCR_700_slave_destroy(struct scsi_device *SDp)
2075 {
2076 kfree(SDp->hostdata);
2077 SDp->hostdata = NULL;
2078 }
2079
2080 static int
2081 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2082 {
2083 if (depth > NCR_700_MAX_TAGS)
2084 depth = NCR_700_MAX_TAGS;
2085 return scsi_change_queue_depth(SDp, depth);
2086 }
2087
2088 static ssize_t
2089 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2090 {
2091 struct scsi_device *SDp = to_scsi_device(dev);
2092
2093 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2094 }
2095
2096 static struct device_attribute NCR_700_active_tags_attr = {
2097 .attr = {
2098 .name = "active_tags",
2099 .mode = S_IRUGO,
2100 },
2101 .show = NCR_700_show_active_tags,
2102 };
2103
2104 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2105 &NCR_700_active_tags_attr,
2106 NULL,
2107 };
2108
2109 EXPORT_SYMBOL(NCR_700_detect);
2110 EXPORT_SYMBOL(NCR_700_release);
2111 EXPORT_SYMBOL(NCR_700_intr);
2112
2113 static struct spi_function_template NCR_700_transport_functions = {
2114 .set_period = NCR_700_set_period,
2115 .show_period = 1,
2116 .set_offset = NCR_700_set_offset,
2117 .show_offset = 1,
2118 };
2119
2120 static int __init NCR_700_init(void)
2121 {
2122 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2123 if(!NCR_700_transport_template)
2124 return -ENODEV;
2125 return 0;
2126 }
2127
2128 static void __exit NCR_700_exit(void)
2129 {
2130 spi_release_transport(NCR_700_transport_template);
2131 }
2132
2133 module_init(NCR_700_init);
2134 module_exit(NCR_700_exit);
2135
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