1 // SPDX-License-Identifier: GPL-2.0-or-later
2
3 /* NCR (or Symbios) 53c700 and 53c700-66 Driver
4 *
5 * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
6 **-----------------------------------------------------------------------------
7 **
8 **
9 **-----------------------------------------------------------------------------
10 */
11
12 /* Notes:
13 *
14 * This driver is designed exclusively for these chips (virtually the
15 * earliest of the scripts engine chips). They need their own drivers
16 * because they are missing so many of the scripts and snazzy register
17 * features of their elder brothers (the 710, 720 and 770).
18 *
19 * The 700 is the lowliest of the line, it can only do async SCSI.
20 * The 700-66 can at least do synchronous SCSI up to 10MHz.
21 *
22 * The 700 chip has no host bus interface logic of its own. However,
23 * it is usually mapped to a location with well defined register
24 * offsets. Therefore, if you can determine the base address and the
25 * irq your board incorporating this chip uses, you can probably use
26 * this driver to run it (although you'll probably have to write a
27 * minimal wrapper for the purpose---see the NCR_D700 driver for
28 * details about how to do this).
29 *
30 *
31 * TODO List:
32 *
33 * 1. Better statistics in the proc fs
34 *
35 * 2. Implement message queue (queues SCSI messages like commands) and make
36 * the abort and device reset functions use them.
37 * */
38
39 /* CHANGELOG
40 *
41 * Version 2.8
42 *
43 * Fixed bad bug affecting tag starvation processing (previously the
44 * driver would hang the system if too many tags starved. Also fixed
45 * bad bug having to do with 10 byte command processing and REQUEST
46 * SENSE (the command would loop forever getting a transfer length
47 * mismatch in the CMD phase).
48 *
49 * Version 2.7
50 *
51 * Fixed scripts problem which caused certain devices (notably CDRWs)
52 * to hang on initial INQUIRY. Updated NCR_700_readl/writel to use
53 * __raw_readl/writel for parisc compatibility (Thomas
54 * Bogendoerfer). Added missing SCp->request_bufflen initialisation
55 * for sense requests (Ryan Bradetich).
56 *
57 * Version 2.6
58 *
59 * Following test of the 64 bit parisc kernel by Richard Hirst,
60 * several problems have now been corrected. Also adds support for
61 * consistent memory allocation.
62 *
63 * Version 2.5
64 *
65 * More Compatibility changes for 710 (now actually works). Enhanced
66 * support for odd clock speeds which constrain SDTR negotiations.
67 * correct cacheline separation for scsi messages and status for
68 * incoherent architectures. Use of the pci mapping functions on
69 * buffers to begin support for 64 bit drivers.
70 *
71 * Version 2.4
72 *
73 * Added support for the 53c710 chip (in 53c700 emulation mode only---no
74 * special 53c710 instructions or registers are used).
75 *
76 * Version 2.3
77 *
78 * More endianness/cache coherency changes.
79 *
80 * Better bad device handling (handles devices lying about tag
81 * queueing support and devices which fail to provide sense data on
82 * contingent allegiance conditions)
83 *
84 * Many thanks to Richard Hirst <rhirst@linuxcare.com> for patiently
85 * debugging this driver on the parisc architecture and suggesting
86 * many improvements and bug fixes.
87 *
88 * Thanks also go to Linuxcare Inc. for providing several PARISC
89 * machines for me to debug the driver on.
90 *
91 * Version 2.2
92 *
93 * Made the driver mem or io mapped; added endian invariance; added
94 * dma cache flushing operations for architectures which need it;
95 * added support for more varied clocking speeds.
96 *
97 * Version 2.1
98 *
99 * Initial modularisation from the D700. See NCR_D700.c for the rest of
100 * the changelog.
101 * */
102 #define NCR_700_VERSION "2.8"
103
104 #include <linux/kernel.h>
105 #include <linux/types.h>
106 #include <linux/string.h>
107 #include <linux/slab.h>
108 #include <linux/ioport.h>
109 #include <linux/delay.h>
110 #include <linux/spinlock.h>
111 #include <linux/completion.h>
112 #include <linux/init.h>
113 #include <linux/proc_fs.h>
114 #include <linux/blkdev.h>
115 #include <linux/module.h>
116 #include <linux/interrupt.h>
117 #include <linux/device.h>
118 #include <linux/pgtable.h>
119 #include <asm/dma.h>
120 #include <asm/io.h>
121 #include <asm/byteorder.h>
122
123 #include <scsi/scsi.h>
124 #include <scsi/scsi_cmnd.h>
125 #include <scsi/scsi_dbg.h>
126 #include <scsi/scsi_eh.h>
127 #include <scsi/scsi_host.h>
128 #include <scsi/scsi_tcq.h>
129 #include <scsi/scsi_transport.h>
130 #include <scsi/scsi_transport_spi.h>
131
132 #include "53c700.h"
133
134 /* NOTE: For 64 bit drivers there are points in the code where we use
135 * a non dereferenceable pointer to point to a structure in dma-able
136 * memory (which is 32 bits) so that we can use all of the structure
137 * operations but take the address at the end. This macro allows us
138 * to truncate the 64 bit pointer down to 32 bits without the compiler
139 * complaining */
140 #define to32bit(x) ((__u32)((unsigned long)(x)))
141
142 #ifdef NCR_700_DEBUG
143 #define STATIC
144 #else
145 #define STATIC static
146 #endif
147
148 MODULE_AUTHOR("James Bottomley");
149 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
150 MODULE_LICENSE("GPL");
151
152 /* This is the script */
153 #include "53c700_d.h"
154
155
156 STATIC int NCR_700_queuecommand(struct Scsi_Host *h, struct scsi_cmnd *);
157 STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
158 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
159 STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
160 STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
161 STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt);
162 STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
163 STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
164 static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth);
165
166 STATIC const struct attribute_group *NCR_700_dev_groups[];
167
168 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
169
170 static char *NCR_700_phase[] = {
171 "",
172 "after selection",
173 "before command phase",
174 "after command phase",
175 "after status phase",
176 "after data in phase",
177 "after data out phase",
178 "during data phase",
179 };
180
181 static char *NCR_700_condition[] = {
182 "",
183 "NOT MSG_OUT",
184 "UNEXPECTED PHASE",
185 "NOT MSG_IN",
186 "UNEXPECTED MSG",
187 "MSG_IN",
188 "SDTR_MSG RECEIVED",
189 "REJECT_MSG RECEIVED",
190 "DISCONNECT_MSG RECEIVED",
191 "MSG_OUT",
192 "DATA_IN",
193
194 };
195
196 static char *NCR_700_fatal_messages[] = {
197 "unexpected message after reselection",
198 "still MSG_OUT after message injection",
199 "not MSG_IN after selection",
200 "Illegal message length received",
201 };
202
203 static char *NCR_700_SBCL_bits[] = {
204 "IO ",
205 "CD ",
206 "MSG ",
207 "ATN ",
208 "SEL ",
209 "BSY ",
210 "ACK ",
211 "REQ ",
212 };
213
214 static char *NCR_700_SBCL_to_phase[] = {
215 "DATA_OUT",
216 "DATA_IN",
217 "CMD_OUT",
218 "STATE",
219 "ILLEGAL PHASE",
220 "ILLEGAL PHASE",
221 "MSG OUT",
222 "MSG IN",
223 };
224
225 /* This translates the SDTR message offset and period to a value
226 * which can be loaded into the SXFER_REG.
227 *
228 * NOTE: According to SCSI-2, the true transfer period (in ns) is
229 * actually four times this period value */
230 static inline __u8
NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters * hostdata,__u8 offset,__u8 period)231 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
232 __u8 offset, __u8 period)
233 {
234 int XFERP;
235
236 __u8 min_xferp = (hostdata->chip710
237 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
238 __u8 max_offset = (hostdata->chip710
239 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
240
241 if(offset == 0)
242 return 0;
243
244 if(period < hostdata->min_period) {
245 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
246 period = hostdata->min_period;
247 }
248 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
249 if(offset > max_offset) {
250 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
251 offset, max_offset);
252 offset = max_offset;
253 }
254 if(XFERP < min_xferp) {
255 XFERP = min_xferp;
256 }
257 return (offset & 0x0f) | (XFERP & 0x07)<<4;
258 }
259
260 static inline __u8
NCR_700_get_SXFER(struct scsi_device * SDp)261 NCR_700_get_SXFER(struct scsi_device *SDp)
262 {
263 struct NCR_700_Host_Parameters *hostdata =
264 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
265
266 return NCR_700_offset_period_to_sxfer(hostdata,
267 spi_offset(SDp->sdev_target),
268 spi_period(SDp->sdev_target));
269 }
270
virt_to_dma(struct NCR_700_Host_Parameters * h,void * p)271 static inline dma_addr_t virt_to_dma(struct NCR_700_Host_Parameters *h, void *p)
272 {
273 return h->pScript + ((uintptr_t)p - (uintptr_t)h->script);
274 }
275
dma_sync_to_dev(struct NCR_700_Host_Parameters * h,void * addr,size_t size)276 static inline void dma_sync_to_dev(struct NCR_700_Host_Parameters *h,
277 void *addr, size_t size)
278 {
279 if (h->noncoherent)
280 dma_sync_single_for_device(h->dev, virt_to_dma(h, addr),
281 size, DMA_BIDIRECTIONAL);
282 }
283
dma_sync_from_dev(struct NCR_700_Host_Parameters * h,void * addr,size_t size)284 static inline void dma_sync_from_dev(struct NCR_700_Host_Parameters *h,
285 void *addr, size_t size)
286 {
287 if (h->noncoherent)
288 dma_sync_single_for_device(h->dev, virt_to_dma(h, addr), size,
289 DMA_BIDIRECTIONAL);
290 }
291
292 struct Scsi_Host *
NCR_700_detect(struct scsi_host_template * tpnt,struct NCR_700_Host_Parameters * hostdata,struct device * dev)293 NCR_700_detect(struct scsi_host_template *tpnt,
294 struct NCR_700_Host_Parameters *hostdata, struct device *dev)
295 {
296 dma_addr_t pScript, pSlots;
297 __u8 *memory;
298 __u32 *script;
299 struct Scsi_Host *host;
300 static int banner = 0;
301 int j;
302
303 if (tpnt->sdev_groups == NULL)
304 tpnt->sdev_groups = NCR_700_dev_groups;
305
306 memory = dma_alloc_coherent(dev, TOTAL_MEM_SIZE, &pScript, GFP_KERNEL);
307 if (!memory) {
308 hostdata->noncoherent = 1;
309 memory = dma_alloc_noncoherent(dev, TOTAL_MEM_SIZE, &pScript,
310 DMA_BIDIRECTIONAL, GFP_KERNEL);
311 }
312 if (!memory) {
313 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detaching\n");
314 return NULL;
315 }
316
317 script = (__u32 *)memory;
318 hostdata->msgin = memory + MSGIN_OFFSET;
319 hostdata->msgout = memory + MSGOUT_OFFSET;
320 hostdata->status = memory + STATUS_OFFSET;
321 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
322 hostdata->dev = dev;
323
324 pSlots = pScript + SLOTS_OFFSET;
325
326 /* Fill in the missing routines from the host template */
327 tpnt->queuecommand = NCR_700_queuecommand;
328 tpnt->eh_abort_handler = NCR_700_abort;
329 tpnt->eh_host_reset_handler = NCR_700_host_reset;
330 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
331 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
332 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
333 tpnt->slave_configure = NCR_700_slave_configure;
334 tpnt->slave_destroy = NCR_700_slave_destroy;
335 tpnt->slave_alloc = NCR_700_slave_alloc;
336 tpnt->change_queue_depth = NCR_700_change_queue_depth;
337
338 if(tpnt->name == NULL)
339 tpnt->name = "53c700";
340 if(tpnt->proc_name == NULL)
341 tpnt->proc_name = "53c700";
342
343 host = scsi_host_alloc(tpnt, 4);
344 if (!host)
345 return NULL;
346 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
347 * NCR_700_COMMAND_SLOTS_PER_HOST);
348 for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
349 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
350 - (unsigned long)&hostdata->slots[0].SG[0]);
351 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
352 if(j == 0)
353 hostdata->free_list = &hostdata->slots[j];
354 else
355 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
356 hostdata->slots[j].state = NCR_700_SLOT_FREE;
357 }
358
359 for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
360 script[j] = bS_to_host(SCRIPT[j]);
361
362 /* adjust all labels to be bus physical */
363 for (j = 0; j < PATCHES; j++)
364 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
365 /* now patch up fixed addresses. */
366 script_patch_32(hostdata, script, MessageLocation,
367 pScript + MSGOUT_OFFSET);
368 script_patch_32(hostdata, script, StatusAddress,
369 pScript + STATUS_OFFSET);
370 script_patch_32(hostdata, script, ReceiveMsgAddress,
371 pScript + MSGIN_OFFSET);
372
373 hostdata->script = script;
374 hostdata->pScript = pScript;
375 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
376 hostdata->state = NCR_700_HOST_FREE;
377 hostdata->cmd = NULL;
378 host->max_id = 8;
379 host->max_lun = NCR_700_MAX_LUNS;
380 BUG_ON(NCR_700_transport_template == NULL);
381 host->transportt = NCR_700_transport_template;
382 host->unique_id = (unsigned long)hostdata->base;
383 hostdata->eh_complete = NULL;
384 host->hostdata[0] = (unsigned long)hostdata;
385 /* kick the chip */
386 NCR_700_writeb(0xff, host, CTEST9_REG);
387 if (hostdata->chip710)
388 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
389 else
390 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
391 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
392 if (banner == 0) {
393 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
394 banner = 1;
395 }
396 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
397 hostdata->chip710 ? "53c710" :
398 (hostdata->fast ? "53c700-66" : "53c700"),
399 hostdata->rev, hostdata->differential ?
400 "(Differential)" : "");
401 /* reset the chip */
402 NCR_700_chip_reset(host);
403
404 if (scsi_add_host(host, dev)) {
405 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
406 scsi_host_put(host);
407 return NULL;
408 }
409
410 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
411 SPI_SIGNAL_SE;
412
413 return host;
414 }
415
416 int
NCR_700_release(struct Scsi_Host * host)417 NCR_700_release(struct Scsi_Host *host)
418 {
419 struct NCR_700_Host_Parameters *hostdata =
420 (struct NCR_700_Host_Parameters *)host->hostdata[0];
421
422 if (hostdata->noncoherent)
423 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
424 hostdata->script, hostdata->pScript,
425 DMA_BIDIRECTIONAL);
426 else
427 dma_free_coherent(hostdata->dev, TOTAL_MEM_SIZE,
428 hostdata->script, hostdata->pScript);
429 return 1;
430 }
431
432 static inline __u8
NCR_700_identify(int can_disconnect,__u8 lun)433 NCR_700_identify(int can_disconnect, __u8 lun)
434 {
435 return IDENTIFY_BASE |
436 ((can_disconnect) ? 0x40 : 0) |
437 (lun & NCR_700_LUN_MASK);
438 }
439
440 /*
441 * Function : static int data_residual (Scsi_Host *host)
442 *
443 * Purpose : return residual data count of what's in the chip. If you
444 * really want to know what this function is doing, it's almost a
445 * direct transcription of the algorithm described in the 53c710
446 * guide, except that the DBC and DFIFO registers are only 6 bits
447 * wide on a 53c700.
448 *
449 * Inputs : host - SCSI host */
450 static inline int
NCR_700_data_residual(struct Scsi_Host * host)451 NCR_700_data_residual (struct Scsi_Host *host) {
452 struct NCR_700_Host_Parameters *hostdata =
453 (struct NCR_700_Host_Parameters *)host->hostdata[0];
454 int count, synchronous = 0;
455 unsigned int ddir;
456
457 if(hostdata->chip710) {
458 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
459 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
460 } else {
461 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
462 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
463 }
464
465 if(hostdata->fast)
466 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
467
468 /* get the data direction */
469 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
470
471 if (ddir) {
472 /* Receive */
473 if (synchronous)
474 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
475 else
476 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
477 ++count;
478 } else {
479 /* Send */
480 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
481 if (sstat & SODL_REG_FULL)
482 ++count;
483 if (synchronous && (sstat & SODR_REG_FULL))
484 ++count;
485 }
486 #ifdef NCR_700_DEBUG
487 if(count)
488 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
489 #endif
490 return count;
491 }
492
493 /* print out the SCSI wires and corresponding phase from the SBCL register
494 * in the chip */
495 static inline char *
sbcl_to_string(__u8 sbcl)496 sbcl_to_string(__u8 sbcl)
497 {
498 int i;
499 static char ret[256];
500
501 ret[0]='\0';
502 for(i=0; i<8; i++) {
503 if((1<<i) & sbcl)
504 strcat(ret, NCR_700_SBCL_bits[i]);
505 }
506 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
507 return ret;
508 }
509
510 static inline __u8
bitmap_to_number(__u8 bitmap)511 bitmap_to_number(__u8 bitmap)
512 {
513 __u8 i;
514
515 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
516 ;
517 return i;
518 }
519
520 /* Pull a slot off the free list */
521 STATIC struct NCR_700_command_slot *
find_empty_slot(struct NCR_700_Host_Parameters * hostdata)522 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
523 {
524 struct NCR_700_command_slot *slot = hostdata->free_list;
525
526 if(slot == NULL) {
527 /* sanity check */
528 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
529 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
530 return NULL;
531 }
532
533 if(slot->state != NCR_700_SLOT_FREE)
534 /* should panic! */
535 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
536
537
538 hostdata->free_list = slot->ITL_forw;
539 slot->ITL_forw = NULL;
540
541
542 /* NOTE: set the state to busy here, not queued, since this
543 * indicates the slot is in use and cannot be run by the IRQ
544 * finish routine. If we cannot queue the command when it
545 * is properly build, we then change to NCR_700_SLOT_QUEUED */
546 slot->state = NCR_700_SLOT_BUSY;
547 slot->flags = 0;
548 hostdata->command_slot_count++;
549
550 return slot;
551 }
552
553 STATIC void
free_slot(struct NCR_700_command_slot * slot,struct NCR_700_Host_Parameters * hostdata)554 free_slot(struct NCR_700_command_slot *slot,
555 struct NCR_700_Host_Parameters *hostdata)
556 {
557 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
558 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
559 }
560 if(slot->state == NCR_700_SLOT_FREE) {
561 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
562 }
563
564 slot->resume_offset = 0;
565 slot->cmnd = NULL;
566 slot->state = NCR_700_SLOT_FREE;
567 slot->ITL_forw = hostdata->free_list;
568 hostdata->free_list = slot;
569 hostdata->command_slot_count--;
570 }
571
572
573 /* This routine really does very little. The command is indexed on
574 the ITL and (if tagged) the ITLQ lists in _queuecommand */
575 STATIC void
save_for_reselection(struct NCR_700_Host_Parameters * hostdata,struct scsi_cmnd * SCp,__u32 dsp)576 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
577 struct scsi_cmnd *SCp, __u32 dsp)
578 {
579 /* Its just possible that this gets executed twice */
580 if(SCp != NULL) {
581 struct NCR_700_command_slot *slot =
582 (struct NCR_700_command_slot *)SCp->host_scribble;
583
584 slot->resume_offset = dsp;
585 }
586 hostdata->state = NCR_700_HOST_FREE;
587 hostdata->cmd = NULL;
588 }
589
590 STATIC inline void
NCR_700_unmap(struct NCR_700_Host_Parameters * hostdata,struct scsi_cmnd * SCp,struct NCR_700_command_slot * slot)591 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
592 struct NCR_700_command_slot *slot)
593 {
594 if(SCp->sc_data_direction != DMA_NONE &&
595 SCp->sc_data_direction != DMA_BIDIRECTIONAL)
596 scsi_dma_unmap(SCp);
597 }
598
599 STATIC inline void
NCR_700_scsi_done(struct NCR_700_Host_Parameters * hostdata,struct scsi_cmnd * SCp,int result)600 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
601 struct scsi_cmnd *SCp, int result)
602 {
603 hostdata->state = NCR_700_HOST_FREE;
604 hostdata->cmd = NULL;
605
606 if(SCp != NULL) {
607 struct NCR_700_command_slot *slot =
608 (struct NCR_700_command_slot *)SCp->host_scribble;
609
610 dma_unmap_single(hostdata->dev, slot->pCmd,
611 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
612 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
613 char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
614
615 dma_unmap_single(hostdata->dev, slot->dma_handle,
616 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
617 /* restore the old result if the request sense was
618 * successful */
619 if (result == 0)
620 result = cmnd[7];
621 /* restore the original length */
622 SCp->cmd_len = cmnd[8];
623 } else
624 NCR_700_unmap(hostdata, SCp, slot);
625
626 free_slot(slot, hostdata);
627 #ifdef NCR_700_DEBUG
628 if(NCR_700_get_depth(SCp->device) == 0 ||
629 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
630 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
631 NCR_700_get_depth(SCp->device));
632 #endif /* NCR_700_DEBUG */
633 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
634
635 SCp->host_scribble = NULL;
636 SCp->result = result;
637 scsi_done(SCp);
638 } else {
639 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
640 }
641 }
642
643
644 STATIC void
NCR_700_internal_bus_reset(struct Scsi_Host * host)645 NCR_700_internal_bus_reset(struct Scsi_Host *host)
646 {
647 /* Bus reset */
648 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
649 udelay(50);
650 NCR_700_writeb(0, host, SCNTL1_REG);
651
652 }
653
654 STATIC void
NCR_700_chip_setup(struct Scsi_Host * host)655 NCR_700_chip_setup(struct Scsi_Host *host)
656 {
657 struct NCR_700_Host_Parameters *hostdata =
658 (struct NCR_700_Host_Parameters *)host->hostdata[0];
659 __u8 min_period;
660 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
661
662 if(hostdata->chip710) {
663 __u8 burst_disable = 0;
664 __u8 burst_length = 0;
665
666 switch (hostdata->burst_length) {
667 case 1:
668 burst_length = BURST_LENGTH_1;
669 break;
670 case 2:
671 burst_length = BURST_LENGTH_2;
672 break;
673 case 4:
674 burst_length = BURST_LENGTH_4;
675 break;
676 case 8:
677 burst_length = BURST_LENGTH_8;
678 break;
679 default:
680 burst_disable = BURST_DISABLE;
681 break;
682 }
683 hostdata->dcntl_extra |= COMPAT_700_MODE;
684
685 NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);
686 NCR_700_writeb(burst_length | hostdata->dmode_extra,
687 host, DMODE_710_REG);
688 NCR_700_writeb(burst_disable | hostdata->ctest7_extra |
689 (hostdata->differential ? DIFF : 0),
690 host, CTEST7_REG);
691 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
692 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
693 | AUTO_ATN, host, SCNTL0_REG);
694 } else {
695 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
696 host, DMODE_700_REG);
697 NCR_700_writeb(hostdata->differential ?
698 DIFF : 0, host, CTEST7_REG);
699 if(hostdata->fast) {
700 /* this is for 700-66, does nothing on 700 */
701 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
702 | GENERATE_RECEIVE_PARITY, host,
703 CTEST8_REG);
704 } else {
705 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
706 | PARITY | AUTO_ATN, host, SCNTL0_REG);
707 }
708 }
709
710 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
711 NCR_700_writeb(0, host, SBCL_REG);
712 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
713
714 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
715 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
716
717 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
718 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
719 if(hostdata->clock > 75) {
720 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
721 /* do the best we can, but the async clock will be out
722 * of spec: sync divider 2, async divider 3 */
723 DEBUG(("53c700: sync 2 async 3\n"));
724 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
725 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
726 hostdata->sync_clock = hostdata->clock/2;
727 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
728 /* sync divider 1.5, async divider 3 */
729 DEBUG(("53c700: sync 1.5 async 3\n"));
730 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
731 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
732 hostdata->sync_clock = hostdata->clock*2;
733 hostdata->sync_clock /= 3;
734
735 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
736 /* sync divider 1, async divider 2 */
737 DEBUG(("53c700: sync 1 async 2\n"));
738 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
739 NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);
740 hostdata->sync_clock = hostdata->clock;
741 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
742 /* sync divider 1, async divider 1.5 */
743 DEBUG(("53c700: sync 1 async 1.5\n"));
744 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
745 NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);
746 hostdata->sync_clock = hostdata->clock;
747 } else {
748 DEBUG(("53c700: sync 1 async 1\n"));
749 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
750 NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);
751 /* sync divider 1, async divider 1 */
752 hostdata->sync_clock = hostdata->clock;
753 }
754 /* Calculate the actual minimum period that can be supported
755 * by our synchronous clock speed. See the 710 manual for
756 * exact details of this calculation which is based on a
757 * setting of the SXFER register */
758 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
759 hostdata->min_period = NCR_700_MIN_PERIOD;
760 if(min_period > NCR_700_MIN_PERIOD)
761 hostdata->min_period = min_period;
762 }
763
764 STATIC void
NCR_700_chip_reset(struct Scsi_Host * host)765 NCR_700_chip_reset(struct Scsi_Host *host)
766 {
767 struct NCR_700_Host_Parameters *hostdata =
768 (struct NCR_700_Host_Parameters *)host->hostdata[0];
769 if(hostdata->chip710) {
770 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
771 udelay(100);
772
773 NCR_700_writeb(0, host, ISTAT_REG);
774 } else {
775 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
776 udelay(100);
777
778 NCR_700_writeb(0, host, DCNTL_REG);
779 }
780
781 mdelay(1000);
782
783 NCR_700_chip_setup(host);
784 }
785
786 /* The heart of the message processing engine is that the instruction
787 * immediately after the INT is the normal case (and so must be CLEAR
788 * ACK). If we want to do something else, we call that routine in
789 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
790 * ACK) so that the routine returns correctly to resume its activity
791 * */
792 STATIC __u32
process_extended_message(struct Scsi_Host * host,struct NCR_700_Host_Parameters * hostdata,struct scsi_cmnd * SCp,__u32 dsp,__u32 dsps)793 process_extended_message(struct Scsi_Host *host,
794 struct NCR_700_Host_Parameters *hostdata,
795 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
796 {
797 __u32 resume_offset = dsp, temp = dsp + 8;
798 __u8 pun = 0xff, lun = 0xff;
799
800 if(SCp != NULL) {
801 pun = SCp->device->id;
802 lun = SCp->device->lun;
803 }
804
805 switch(hostdata->msgin[2]) {
806 case A_SDTR_MSG:
807 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
808 struct scsi_target *starget = SCp->device->sdev_target;
809 __u8 period = hostdata->msgin[3];
810 __u8 offset = hostdata->msgin[4];
811
812 if(offset == 0 || period == 0) {
813 offset = 0;
814 period = 0;
815 }
816
817 spi_offset(starget) = offset;
818 spi_period(starget) = period;
819
820 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
821 spi_display_xfer_agreement(starget);
822 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
823 }
824
825 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
826 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
827
828 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
829 host, SXFER_REG);
830
831 } else {
832 /* SDTR message out of the blue, reject it */
833 shost_printk(KERN_WARNING, host,
834 "Unexpected SDTR msg\n");
835 hostdata->msgout[0] = A_REJECT_MSG;
836 dma_sync_to_dev(hostdata, hostdata->msgout, 1);
837 script_patch_16(hostdata, hostdata->script,
838 MessageCount, 1);
839 /* SendMsgOut returns, so set up the return
840 * address */
841 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
842 }
843 break;
844
845 case A_WDTR_MSG:
846 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
847 host->host_no, pun, lun);
848 hostdata->msgout[0] = A_REJECT_MSG;
849 dma_sync_to_dev(hostdata, hostdata->msgout, 1);
850 script_patch_16(hostdata, hostdata->script, MessageCount, 1);
851 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
852
853 break;
854
855 default:
856 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
857 host->host_no, pun, lun,
858 NCR_700_phase[(dsps & 0xf00) >> 8]);
859 spi_print_msg(hostdata->msgin);
860 printk("\n");
861 /* just reject it */
862 hostdata->msgout[0] = A_REJECT_MSG;
863 dma_sync_to_dev(hostdata, hostdata->msgout, 1);
864 script_patch_16(hostdata, hostdata->script, MessageCount, 1);
865 /* SendMsgOut returns, so set up the return
866 * address */
867 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
868 }
869 NCR_700_writel(temp, host, TEMP_REG);
870 return resume_offset;
871 }
872
873 STATIC __u32
process_message(struct Scsi_Host * host,struct NCR_700_Host_Parameters * hostdata,struct scsi_cmnd * SCp,__u32 dsp,__u32 dsps)874 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
875 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
876 {
877 /* work out where to return to */
878 __u32 temp = dsp + 8, resume_offset = dsp;
879 __u8 pun = 0xff, lun = 0xff;
880
881 if(SCp != NULL) {
882 pun = SCp->device->id;
883 lun = SCp->device->lun;
884 }
885
886 #ifdef NCR_700_DEBUG
887 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
888 NCR_700_phase[(dsps & 0xf00) >> 8]);
889 spi_print_msg(hostdata->msgin);
890 printk("\n");
891 #endif
892
893 switch(hostdata->msgin[0]) {
894
895 case A_EXTENDED_MSG:
896 resume_offset = process_extended_message(host, hostdata, SCp,
897 dsp, dsps);
898 break;
899
900 case A_REJECT_MSG:
901 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
902 /* Rejected our sync negotiation attempt */
903 spi_period(SCp->device->sdev_target) =
904 spi_offset(SCp->device->sdev_target) = 0;
905 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
906 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
907 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
908 /* rejected our first simple tag message */
909 scmd_printk(KERN_WARNING, SCp,
910 "Rejected first tag queue attempt, turning off tag queueing\n");
911 /* we're done negotiating */
912 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
913 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
914
915 SCp->device->tagged_supported = 0;
916 SCp->device->simple_tags = 0;
917 scsi_change_queue_depth(SCp->device, host->cmd_per_lun);
918 } else {
919 shost_printk(KERN_WARNING, host,
920 "(%d:%d) Unexpected REJECT Message %s\n",
921 pun, lun,
922 NCR_700_phase[(dsps & 0xf00) >> 8]);
923 /* however, just ignore it */
924 }
925 break;
926
927 case A_PARITY_ERROR_MSG:
928 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
929 pun, lun);
930 NCR_700_internal_bus_reset(host);
931 break;
932 case A_SIMPLE_TAG_MSG:
933 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
934 pun, lun, hostdata->msgin[1],
935 NCR_700_phase[(dsps & 0xf00) >> 8]);
936 /* just ignore it */
937 break;
938 default:
939 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
940 host->host_no, pun, lun,
941 NCR_700_phase[(dsps & 0xf00) >> 8]);
942
943 spi_print_msg(hostdata->msgin);
944 printk("\n");
945 /* just reject it */
946 hostdata->msgout[0] = A_REJECT_MSG;
947 dma_sync_to_dev(hostdata, hostdata->msgout, 1);
948 script_patch_16(hostdata, hostdata->script, MessageCount, 1);
949 /* SendMsgOut returns, so set up the return
950 * address */
951 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
952
953 break;
954 }
955 NCR_700_writel(temp, host, TEMP_REG);
956 /* set us up to receive another message */
957 dma_sync_from_dev(hostdata, hostdata->msgin, MSG_ARRAY_SIZE);
958 return resume_offset;
959 }
960
961 STATIC __u32
process_script_interrupt(__u32 dsps,__u32 dsp,struct scsi_cmnd * SCp,struct Scsi_Host * host,struct NCR_700_Host_Parameters * hostdata)962 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
963 struct Scsi_Host *host,
964 struct NCR_700_Host_Parameters *hostdata)
965 {
966 __u32 resume_offset = 0;
967 __u8 pun = 0xff, lun=0xff;
968
969 if(SCp != NULL) {
970 pun = SCp->device->id;
971 lun = SCp->device->lun;
972 }
973
974 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
975 DEBUG((" COMMAND COMPLETE, status=%02x\n",
976 hostdata->status[0]));
977 /* OK, if TCQ still under negotiation, we now know it works */
978 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
979 NCR_700_set_tag_neg_state(SCp->device,
980 NCR_700_FINISHED_TAG_NEGOTIATION);
981
982 /* check for contingent allegiance conditions */
983 if (hostdata->status[0] == SAM_STAT_CHECK_CONDITION ||
984 hostdata->status[0] == SAM_STAT_COMMAND_TERMINATED) {
985 struct NCR_700_command_slot *slot =
986 (struct NCR_700_command_slot *)SCp->host_scribble;
987 if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
988 /* OOPS: bad device, returning another
989 * contingent allegiance condition */
990 scmd_printk(KERN_ERR, SCp,
991 "broken device is looping in contingent allegiance: ignoring\n");
992 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
993 } else {
994 char *cmnd =
995 NCR_700_get_sense_cmnd(SCp->device);
996 #ifdef NCR_DEBUG
997 scsi_print_command(SCp);
998 printk(" cmd %p has status %d, requesting sense\n",
999 SCp, hostdata->status[0]);
1000 #endif
1001 /* we can destroy the command here
1002 * because the contingent allegiance
1003 * condition will cause a retry which
1004 * will re-copy the command from the
1005 * saved data_cmnd. We also unmap any
1006 * data associated with the command
1007 * here */
1008 NCR_700_unmap(hostdata, SCp, slot);
1009 dma_unmap_single(hostdata->dev, slot->pCmd,
1010 MAX_COMMAND_SIZE,
1011 DMA_TO_DEVICE);
1012
1013 cmnd[0] = REQUEST_SENSE;
1014 cmnd[1] = (lun & 0x7) << 5;
1015 cmnd[2] = 0;
1016 cmnd[3] = 0;
1017 cmnd[4] = SCSI_SENSE_BUFFERSIZE;
1018 cmnd[5] = 0;
1019 /* Here's a quiet hack: the
1020 * REQUEST_SENSE command is six bytes,
1021 * so store a flag indicating that
1022 * this was an internal sense request
1023 * and the original status at the end
1024 * of the command */
1025 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1026 cmnd[7] = hostdata->status[0];
1027 cmnd[8] = SCp->cmd_len;
1028 SCp->cmd_len = 6; /* command length for
1029 * REQUEST_SENSE */
1030 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1031 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1032 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | SCSI_SENSE_BUFFERSIZE);
1033 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1034 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1035 slot->SG[1].pAddr = 0;
1036 slot->resume_offset = hostdata->pScript;
1037 dma_sync_to_dev(hostdata, slot->SG, sizeof(slot->SG[0])*2);
1038 dma_sync_from_dev(hostdata, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE);
1039
1040 /* queue the command for reissue */
1041 slot->state = NCR_700_SLOT_QUEUED;
1042 slot->flags = NCR_700_FLAG_AUTOSENSE;
1043 hostdata->state = NCR_700_HOST_FREE;
1044 hostdata->cmd = NULL;
1045 }
1046 } else {
1047 // Currently rely on the mid layer evaluation
1048 // of the tag queuing capability
1049 //
1050 //if(status_byte(hostdata->status[0]) == GOOD &&
1051 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1052 // /* Piggy back the tag queueing support
1053 // * on this command */
1054 // dma_sync_single_for_cpu(hostdata->dev,
1055 // slot->dma_handle,
1056 // SCp->request_bufflen,
1057 // DMA_FROM_DEVICE);
1058 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1059 // scmd_printk(KERN_INFO, SCp,
1060 // "Enabling Tag Command Queuing\n");
1061 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1062 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1063 // } else {
1064 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1065 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1066 // }
1067 //}
1068 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1069 }
1070 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1071 __u8 i = (dsps & 0xf00) >> 8;
1072
1073 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1074 NCR_700_phase[i],
1075 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1076 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =",
1077 SCp->cmd_len);
1078 scsi_print_command(SCp);
1079
1080 NCR_700_internal_bus_reset(host);
1081 } else if((dsps & 0xfffff000) == A_FATAL) {
1082 int i = (dsps & 0xfff);
1083
1084 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1085 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1086 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1087 printk(KERN_ERR " msg begins %02x %02x\n",
1088 hostdata->msgin[0], hostdata->msgin[1]);
1089 }
1090 NCR_700_internal_bus_reset(host);
1091 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1092 #ifdef NCR_700_DEBUG
1093 __u8 i = (dsps & 0xf00) >> 8;
1094
1095 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1096 host->host_no, pun, lun,
1097 i, NCR_700_phase[i]);
1098 #endif
1099 save_for_reselection(hostdata, SCp, dsp);
1100
1101 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1102 __u8 lun;
1103 struct NCR_700_command_slot *slot;
1104 __u8 reselection_id = hostdata->reselection_id;
1105 struct scsi_device *SDp;
1106
1107 lun = hostdata->msgin[0] & 0x1f;
1108
1109 hostdata->reselection_id = 0xff;
1110 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1111 host->host_no, reselection_id, lun));
1112 /* clear the reselection indicator */
1113 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1114 if(unlikely(SDp == NULL)) {
1115 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1116 host->host_no, reselection_id, lun);
1117 BUG();
1118 }
1119 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1120 struct scsi_cmnd *SCp;
1121
1122 SCp = scsi_host_find_tag(SDp->host, hostdata->msgin[2]);
1123 if(unlikely(SCp == NULL)) {
1124 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1125 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1126 BUG();
1127 }
1128
1129 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1130 DDEBUG(KERN_DEBUG, SDp,
1131 "reselection is tag %d, slot %p(%d)\n",
1132 hostdata->msgin[2], slot, slot->tag);
1133 } else {
1134 struct NCR_700_Device_Parameters *p = SDp->hostdata;
1135 struct scsi_cmnd *SCp = p->current_cmnd;
1136
1137 if(unlikely(SCp == NULL)) {
1138 sdev_printk(KERN_ERR, SDp,
1139 "no saved request for untagged cmd\n");
1140 BUG();
1141 }
1142 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1143 }
1144
1145 if(slot == NULL) {
1146 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1147 host->host_no, reselection_id, lun,
1148 hostdata->msgin[0], hostdata->msgin[1],
1149 hostdata->msgin[2]);
1150 } else {
1151 if(hostdata->state != NCR_700_HOST_BUSY)
1152 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1153 host->host_no);
1154 resume_offset = slot->resume_offset;
1155 hostdata->cmd = slot->cmnd;
1156
1157 /* re-patch for this command */
1158 script_patch_32_abs(hostdata, hostdata->script,
1159 CommandAddress, slot->pCmd);
1160 script_patch_16(hostdata, hostdata->script,
1161 CommandCount, slot->cmnd->cmd_len);
1162 script_patch_32_abs(hostdata, hostdata->script,
1163 SGScriptStartAddress,
1164 to32bit(&slot->pSG[0].ins));
1165
1166 /* Note: setting SXFER only works if we're
1167 * still in the MESSAGE phase, so it is vital
1168 * that ACK is still asserted when we process
1169 * the reselection message. The resume offset
1170 * should therefore always clear ACK */
1171 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1172 host, SXFER_REG);
1173 dma_sync_from_dev(hostdata, hostdata->msgin,
1174 MSG_ARRAY_SIZE);
1175 dma_sync_to_dev(hostdata, hostdata->msgout,
1176 MSG_ARRAY_SIZE);
1177 /* I'm just being paranoid here, the command should
1178 * already have been flushed from the cache */
1179 dma_sync_to_dev(hostdata, slot->cmnd->cmnd,
1180 slot->cmnd->cmd_len);
1181
1182
1183
1184 }
1185 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1186
1187 /* This section is full of debugging code because I've
1188 * never managed to reach it. I think what happens is
1189 * that, because the 700 runs with selection
1190 * interrupts enabled the whole time that we take a
1191 * selection interrupt before we manage to get to the
1192 * reselected script interrupt */
1193
1194 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1195 struct NCR_700_command_slot *slot;
1196
1197 /* Take out our own ID */
1198 reselection_id &= ~(1<<host->this_id);
1199
1200 /* I've never seen this happen, so keep this as a printk rather
1201 * than a debug */
1202 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1203 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1204
1205 {
1206 /* FIXME: DEBUGGING CODE */
1207 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1208 int i;
1209
1210 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1211 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1212 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1213 break;
1214 }
1215 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);
1216 SCp = hostdata->slots[i].cmnd;
1217 }
1218
1219 if(SCp != NULL) {
1220 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1221 /* change slot from busy to queued to redo command */
1222 slot->state = NCR_700_SLOT_QUEUED;
1223 }
1224 hostdata->cmd = NULL;
1225
1226 if(reselection_id == 0) {
1227 if(hostdata->reselection_id == 0xff) {
1228 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1229 return 0;
1230 } else {
1231 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1232 host->host_no);
1233 reselection_id = hostdata->reselection_id;
1234 }
1235 } else {
1236
1237 /* convert to real ID */
1238 reselection_id = bitmap_to_number(reselection_id);
1239 }
1240 hostdata->reselection_id = reselection_id;
1241 /* just in case we have a stale simple tag message, clear it */
1242 hostdata->msgin[1] = 0;
1243 dma_sync_to_dev(hostdata, hostdata->msgin, MSG_ARRAY_SIZE);
1244 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1245 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1246 } else {
1247 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1248 }
1249 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1250 /* we've just disconnected from the bus, do nothing since
1251 * a return here will re-run the queued command slot
1252 * that may have been interrupted by the initial selection */
1253 DEBUG((" SELECTION COMPLETED\n"));
1254 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1255 resume_offset = process_message(host, hostdata, SCp,
1256 dsp, dsps);
1257 } else if((dsps & 0xfffff000) == 0) {
1258 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1259 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1260 host->host_no, pun, lun, NCR_700_condition[i],
1261 NCR_700_phase[j], dsp - hostdata->pScript);
1262 if(SCp != NULL) {
1263 struct scatterlist *sg;
1264
1265 scsi_print_command(SCp);
1266 scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {
1267 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);
1268 }
1269 }
1270 NCR_700_internal_bus_reset(host);
1271 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1272 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1273 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1274 resume_offset = dsp;
1275 } else {
1276 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1277 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1278 NCR_700_internal_bus_reset(host);
1279 }
1280 return resume_offset;
1281 }
1282
1283 /* We run the 53c700 with selection interrupts always enabled. This
1284 * means that the chip may be selected as soon as the bus frees. On a
1285 * busy bus, this can be before the scripts engine finishes its
1286 * processing. Therefore, part of the selection processing has to be
1287 * to find out what the scripts engine is doing and complete the
1288 * function if necessary (i.e. process the pending disconnect or save
1289 * the interrupted initial selection */
1290 STATIC inline __u32
process_selection(struct Scsi_Host * host,__u32 dsp)1291 process_selection(struct Scsi_Host *host, __u32 dsp)
1292 {
1293 __u8 id = 0; /* Squash compiler warning */
1294 int count = 0;
1295 __u32 resume_offset = 0;
1296 struct NCR_700_Host_Parameters *hostdata =
1297 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1298 struct scsi_cmnd *SCp = hostdata->cmd;
1299 __u8 sbcl;
1300
1301 for(count = 0; count < 5; count++) {
1302 id = NCR_700_readb(host, hostdata->chip710 ?
1303 CTEST9_REG : SFBR_REG);
1304
1305 /* Take out our own ID */
1306 id &= ~(1<<host->this_id);
1307 if(id != 0)
1308 break;
1309 udelay(5);
1310 }
1311 sbcl = NCR_700_readb(host, SBCL_REG);
1312 if((sbcl & SBCL_IO) == 0) {
1313 /* mark as having been selected rather than reselected */
1314 id = 0xff;
1315 } else {
1316 /* convert to real ID */
1317 hostdata->reselection_id = id = bitmap_to_number(id);
1318 DEBUG(("scsi%d: Reselected by %d\n",
1319 host->host_no, id));
1320 }
1321 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1322 struct NCR_700_command_slot *slot =
1323 (struct NCR_700_command_slot *)SCp->host_scribble;
1324 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));
1325
1326 switch(dsp - hostdata->pScript) {
1327 case Ent_Disconnect1:
1328 case Ent_Disconnect2:
1329 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1330 break;
1331 case Ent_Disconnect3:
1332 case Ent_Disconnect4:
1333 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1334 break;
1335 case Ent_Disconnect5:
1336 case Ent_Disconnect6:
1337 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1338 break;
1339 case Ent_Disconnect7:
1340 case Ent_Disconnect8:
1341 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1342 break;
1343 case Ent_Finish1:
1344 case Ent_Finish2:
1345 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1346 break;
1347
1348 default:
1349 slot->state = NCR_700_SLOT_QUEUED;
1350 break;
1351 }
1352 }
1353 hostdata->state = NCR_700_HOST_BUSY;
1354 hostdata->cmd = NULL;
1355 /* clear any stale simple tag message */
1356 hostdata->msgin[1] = 0;
1357 dma_sync_to_dev(hostdata, hostdata->msgin, MSG_ARRAY_SIZE);
1358
1359 if(id == 0xff) {
1360 /* Selected as target, Ignore */
1361 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1362 } else if(hostdata->tag_negotiated & (1<<id)) {
1363 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1364 } else {
1365 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1366 }
1367 return resume_offset;
1368 }
1369
1370 static inline void
NCR_700_clear_fifo(struct Scsi_Host * host)1371 NCR_700_clear_fifo(struct Scsi_Host *host) {
1372 const struct NCR_700_Host_Parameters *hostdata
1373 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1374 if(hostdata->chip710) {
1375 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1376 } else {
1377 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1378 }
1379 }
1380
1381 static inline void
NCR_700_flush_fifo(struct Scsi_Host * host)1382 NCR_700_flush_fifo(struct Scsi_Host *host) {
1383 const struct NCR_700_Host_Parameters *hostdata
1384 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1385 if(hostdata->chip710) {
1386 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1387 udelay(10);
1388 NCR_700_writeb(0, host, CTEST8_REG);
1389 } else {
1390 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1391 udelay(10);
1392 NCR_700_writeb(0, host, DFIFO_REG);
1393 }
1394 }
1395
1396
1397 /* The queue lock with interrupts disabled must be held on entry to
1398 * this function */
1399 STATIC int
NCR_700_start_command(struct scsi_cmnd * SCp)1400 NCR_700_start_command(struct scsi_cmnd *SCp)
1401 {
1402 struct NCR_700_command_slot *slot =
1403 (struct NCR_700_command_slot *)SCp->host_scribble;
1404 struct NCR_700_Host_Parameters *hostdata =
1405 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1406 __u16 count = 1; /* for IDENTIFY message */
1407 u8 lun = SCp->device->lun;
1408
1409 if(hostdata->state != NCR_700_HOST_FREE) {
1410 /* keep this inside the lock to close the race window where
1411 * the running command finishes on another CPU while we don't
1412 * change the state to queued on this one */
1413 slot->state = NCR_700_SLOT_QUEUED;
1414
1415 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1416 SCp->device->host->host_no, slot->cmnd, slot));
1417 return 0;
1418 }
1419 hostdata->state = NCR_700_HOST_BUSY;
1420 hostdata->cmd = SCp;
1421 slot->state = NCR_700_SLOT_BUSY;
1422 /* keep interrupts disabled until we have the command correctly
1423 * set up so we cannot take a selection interrupt */
1424
1425 hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1426 slot->flags != NCR_700_FLAG_AUTOSENSE),
1427 lun);
1428 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1429 * if the negotiated transfer parameters still hold, so
1430 * always renegotiate them */
1431 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1432 slot->flags == NCR_700_FLAG_AUTOSENSE) {
1433 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1434 }
1435
1436 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1437 * If a contingent allegiance condition exists, the device
1438 * will refuse all tags, so send the request sense as untagged
1439 * */
1440 if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1441 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1442 slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1443 count += spi_populate_tag_msg(&hostdata->msgout[count], SCp);
1444 }
1445
1446 if(hostdata->fast &&
1447 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1448 count += spi_populate_sync_msg(&hostdata->msgout[count],
1449 spi_period(SCp->device->sdev_target),
1450 spi_offset(SCp->device->sdev_target));
1451 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1452 }
1453
1454 script_patch_16(hostdata, hostdata->script, MessageCount, count);
1455
1456 script_patch_ID(hostdata, hostdata->script, Device_ID, 1<<scmd_id(SCp));
1457
1458 script_patch_32_abs(hostdata, hostdata->script, CommandAddress,
1459 slot->pCmd);
1460 script_patch_16(hostdata, hostdata->script, CommandCount, SCp->cmd_len);
1461 /* finally plumb the beginning of the SG list into the script
1462 * */
1463 script_patch_32_abs(hostdata, hostdata->script,
1464 SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
1465 NCR_700_clear_fifo(SCp->device->host);
1466
1467 if(slot->resume_offset == 0)
1468 slot->resume_offset = hostdata->pScript;
1469 /* now perform all the writebacks and invalidates */
1470 dma_sync_to_dev(hostdata, hostdata->msgout, count);
1471 dma_sync_from_dev(hostdata, hostdata->msgin, MSG_ARRAY_SIZE);
1472 dma_sync_to_dev(hostdata, SCp->cmnd, SCp->cmd_len);
1473 dma_sync_from_dev(hostdata, hostdata->status, 1);
1474
1475 /* set the synchronous period/offset */
1476 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1477 SCp->device->host, SXFER_REG);
1478 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1479 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1480
1481 return 1;
1482 }
1483
1484 irqreturn_t
NCR_700_intr(int irq,void * dev_id)1485 NCR_700_intr(int irq, void *dev_id)
1486 {
1487 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1488 struct NCR_700_Host_Parameters *hostdata =
1489 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1490 __u8 istat;
1491 __u32 resume_offset = 0;
1492 __u8 pun = 0xff, lun = 0xff;
1493 unsigned long flags;
1494 int handled = 0;
1495
1496 /* Use the host lock to serialise access to the 53c700
1497 * hardware. Note: In future, we may need to take the queue
1498 * lock to enter the done routines. When that happens, we
1499 * need to ensure that for this driver, the host lock and the
1500 * queue lock point to the same thing. */
1501 spin_lock_irqsave(host->host_lock, flags);
1502 if((istat = NCR_700_readb(host, ISTAT_REG))
1503 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1504 __u32 dsps;
1505 __u8 sstat0 = 0, dstat = 0;
1506 __u32 dsp;
1507 struct scsi_cmnd *SCp = hostdata->cmd;
1508
1509 handled = 1;
1510
1511 if(istat & SCSI_INT_PENDING) {
1512 udelay(10);
1513
1514 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1515 }
1516
1517 if(istat & DMA_INT_PENDING) {
1518 udelay(10);
1519
1520 dstat = NCR_700_readb(host, DSTAT_REG);
1521 }
1522
1523 dsps = NCR_700_readl(host, DSPS_REG);
1524 dsp = NCR_700_readl(host, DSP_REG);
1525
1526 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1527 host->host_no, istat, sstat0, dstat,
1528 (dsp - (__u32)(hostdata->pScript))/4,
1529 dsp, dsps));
1530
1531 if(SCp != NULL) {
1532 pun = SCp->device->id;
1533 lun = SCp->device->lun;
1534 }
1535
1536 if(sstat0 & SCSI_RESET_DETECTED) {
1537 struct scsi_device *SDp;
1538 int i;
1539
1540 hostdata->state = NCR_700_HOST_BUSY;
1541
1542 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1543 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1544
1545 scsi_report_bus_reset(host, 0);
1546
1547 /* clear all the negotiated parameters */
1548 __shost_for_each_device(SDp, host)
1549 NCR_700_clear_flag(SDp, ~0);
1550
1551 /* clear all the slots and their pending commands */
1552 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1553 struct scsi_cmnd *SCp;
1554 struct NCR_700_command_slot *slot =
1555 &hostdata->slots[i];
1556
1557 if(slot->state == NCR_700_SLOT_FREE)
1558 continue;
1559
1560 SCp = slot->cmnd;
1561 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1562 slot, SCp);
1563 free_slot(slot, hostdata);
1564 SCp->host_scribble = NULL;
1565 NCR_700_set_depth(SCp->device, 0);
1566 /* NOTE: deadlock potential here: we
1567 * rely on mid-layer guarantees that
1568 * scsi_done won't try to issue the
1569 * command again otherwise we'll
1570 * deadlock on the
1571 * hostdata->state_lock */
1572 SCp->result = DID_RESET << 16;
1573 scsi_done(SCp);
1574 }
1575 mdelay(25);
1576 NCR_700_chip_setup(host);
1577
1578 hostdata->state = NCR_700_HOST_FREE;
1579 hostdata->cmd = NULL;
1580 /* signal back if this was an eh induced reset */
1581 if(hostdata->eh_complete != NULL)
1582 complete(hostdata->eh_complete);
1583 goto out_unlock;
1584 } else if(sstat0 & SELECTION_TIMEOUT) {
1585 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1586 host->host_no, pun, lun));
1587 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1588 } else if(sstat0 & PHASE_MISMATCH) {
1589 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1590 (struct NCR_700_command_slot *)SCp->host_scribble;
1591
1592 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1593 /* It wants to reply to some part of
1594 * our message */
1595 #ifdef NCR_700_DEBUG
1596 __u32 temp = NCR_700_readl(host, TEMP_REG);
1597 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1598 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)));
1599 #endif
1600 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1601 } else if (slot && dsp >= to32bit(&slot->pSG[0].ins) &&
1602 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1603 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1604 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1605 int residual = NCR_700_data_residual(host);
1606 int i;
1607 #ifdef NCR_700_DEBUG
1608 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1609
1610 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1611 host->host_no, pun, lun,
1612 SGcount, data_transfer);
1613 scsi_print_command(SCp);
1614 if(residual) {
1615 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1616 host->host_no, pun, lun,
1617 SGcount, data_transfer, residual);
1618 }
1619 #endif
1620 data_transfer += residual;
1621
1622 if(data_transfer != 0) {
1623 int count;
1624 __u32 pAddr;
1625
1626 SGcount--;
1627
1628 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1629 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1630 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1631 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1632 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1633 pAddr += (count - data_transfer);
1634 #ifdef NCR_700_DEBUG
1635 if(pAddr != naddr) {
1636 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);
1637 }
1638 #endif
1639 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1640 }
1641 /* set the executed moves to nops */
1642 for(i=0; i<SGcount; i++) {
1643 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1644 slot->SG[i].pAddr = 0;
1645 }
1646 dma_sync_to_dev(hostdata, slot->SG, sizeof(slot->SG));
1647 /* and pretend we disconnected after
1648 * the command phase */
1649 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1650 /* make sure all the data is flushed */
1651 NCR_700_flush_fifo(host);
1652 } else {
1653 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1654 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1655 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1656 NCR_700_internal_bus_reset(host);
1657 }
1658
1659 } else if(sstat0 & SCSI_GROSS_ERROR) {
1660 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1661 host->host_no, pun, lun);
1662 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1663 } else if(sstat0 & PARITY_ERROR) {
1664 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1665 host->host_no, pun, lun);
1666 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1667 } else if(dstat & SCRIPT_INT_RECEIVED) {
1668 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1669 host->host_no, pun, lun));
1670 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1671 } else if(dstat & (ILGL_INST_DETECTED)) {
1672 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1673 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1674 host->host_no, pun, lun,
1675 dsp, dsp - hostdata->pScript);
1676 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1677 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1678 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1679 host->host_no, pun, lun, dstat);
1680 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1681 }
1682
1683
1684 /* NOTE: selection interrupt processing MUST occur
1685 * after script interrupt processing to correctly cope
1686 * with the case where we process a disconnect and
1687 * then get reselected before we process the
1688 * disconnection */
1689 if(sstat0 & SELECTED) {
1690 /* FIXME: It currently takes at least FOUR
1691 * interrupts to complete a command that
1692 * disconnects: one for the disconnect, one
1693 * for the reselection, one to get the
1694 * reselection data and one to complete the
1695 * command. If we guess the reselected
1696 * command here and prepare it, we only need
1697 * to get a reselection data interrupt if we
1698 * guessed wrongly. Since the interrupt
1699 * overhead is much greater than the command
1700 * setup, this would be an efficient
1701 * optimisation particularly as we probably
1702 * only have one outstanding command on a
1703 * target most of the time */
1704
1705 resume_offset = process_selection(host, dsp);
1706
1707 }
1708
1709 }
1710
1711 if(resume_offset) {
1712 if(hostdata->state != NCR_700_HOST_BUSY) {
1713 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1714 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1715 hostdata->state = NCR_700_HOST_BUSY;
1716 }
1717
1718 DEBUG(("Attempting to resume at %x\n", resume_offset));
1719 NCR_700_clear_fifo(host);
1720 NCR_700_writel(resume_offset, host, DSP_REG);
1721 }
1722 /* There is probably a technical no-no about this: If we're a
1723 * shared interrupt and we got this interrupt because the
1724 * other device needs servicing not us, we're still going to
1725 * check our queued commands here---of course, there shouldn't
1726 * be any outstanding.... */
1727 if(hostdata->state == NCR_700_HOST_FREE) {
1728 int i;
1729
1730 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1731 /* fairness: always run the queue from the last
1732 * position we left off */
1733 int j = (i + hostdata->saved_slot_position)
1734 % NCR_700_COMMAND_SLOTS_PER_HOST;
1735
1736 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1737 continue;
1738 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1739 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1740 host->host_no, &hostdata->slots[j],
1741 hostdata->slots[j].cmnd));
1742 hostdata->saved_slot_position = j + 1;
1743 }
1744
1745 break;
1746 }
1747 }
1748 out_unlock:
1749 spin_unlock_irqrestore(host->host_lock, flags);
1750 return IRQ_RETVAL(handled);
1751 }
1752
NCR_700_queuecommand_lck(struct scsi_cmnd * SCp)1753 static int NCR_700_queuecommand_lck(struct scsi_cmnd *SCp)
1754 {
1755 struct NCR_700_Host_Parameters *hostdata =
1756 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1757 __u32 move_ins;
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->host_scribble = (unsigned char *)slot;
1794
1795 #ifdef NCR_700_DEBUG
1796 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1797 scsi_print_command(SCp);
1798 #endif
1799 if ((SCp->flags & SCMD_TAGGED)
1800 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1801 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1802 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1803 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1804 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1805 }
1806
1807 /* here we may have to process an untagged command. The gate
1808 * above ensures that this will be the only one outstanding,
1809 * so clear the tag negotiated bit.
1810 *
1811 * FIXME: This will royally screw up on multiple LUN devices
1812 * */
1813 if (!(SCp->flags & SCMD_TAGGED)
1814 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1815 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1816 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1817 }
1818
1819 if ((hostdata->tag_negotiated & (1<<scmd_id(SCp))) &&
1820 SCp->device->simple_tags) {
1821 slot->tag = scsi_cmd_to_rq(SCp)->tag;
1822 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1823 slot->tag, slot);
1824 } else {
1825 struct NCR_700_Device_Parameters *p = SCp->device->hostdata;
1826
1827 slot->tag = SCSI_NO_TAG;
1828 /* save current command for reselection */
1829 p->current_cmnd = SCp;
1830 }
1831 /* sanity check: some of the commands generated by the mid-layer
1832 * have an eccentric idea of their sc_data_direction */
1833 if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
1834 SCp->sc_data_direction != DMA_NONE) {
1835 #ifdef NCR_700_DEBUG
1836 printk("53c700: Command");
1837 scsi_print_command(SCp);
1838 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1839 #endif
1840 SCp->sc_data_direction = DMA_NONE;
1841 }
1842
1843 switch (SCp->cmnd[0]) {
1844 case REQUEST_SENSE:
1845 /* clear the internal sense magic */
1846 SCp->cmnd[6] = 0;
1847 fallthrough;
1848 default:
1849 /* OK, get it from the command */
1850 switch(SCp->sc_data_direction) {
1851 case DMA_BIDIRECTIONAL:
1852 default:
1853 printk(KERN_ERR "53c700: Unknown command for data direction ");
1854 scsi_print_command(SCp);
1855
1856 move_ins = 0;
1857 break;
1858 case DMA_NONE:
1859 move_ins = 0;
1860 break;
1861 case DMA_FROM_DEVICE:
1862 move_ins = SCRIPT_MOVE_DATA_IN;
1863 break;
1864 case DMA_TO_DEVICE:
1865 move_ins = SCRIPT_MOVE_DATA_OUT;
1866 break;
1867 }
1868 }
1869
1870 /* now build the scatter gather list */
1871 if(move_ins != 0) {
1872 int i;
1873 int sg_count;
1874 dma_addr_t vPtr = 0;
1875 struct scatterlist *sg;
1876 __u32 count = 0;
1877
1878 sg_count = scsi_dma_map(SCp);
1879 BUG_ON(sg_count < 0);
1880
1881 scsi_for_each_sg(SCp, sg, sg_count, i) {
1882 vPtr = sg_dma_address(sg);
1883 count = sg_dma_len(sg);
1884
1885 slot->SG[i].ins = bS_to_host(move_ins | count);
1886 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1887 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1888 slot->SG[i].pAddr = bS_to_host(vPtr);
1889 }
1890 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1891 slot->SG[i].pAddr = 0;
1892 dma_sync_to_dev(hostdata, slot->SG, sizeof(slot->SG));
1893 DEBUG((" SETTING %p to %x\n",
1894 (&slot->pSG[i].ins),
1895 slot->SG[i].ins));
1896 }
1897 slot->resume_offset = 0;
1898 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1899 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1900 NCR_700_start_command(SCp);
1901 return 0;
1902 }
1903
DEF_SCSI_QCMD(NCR_700_queuecommand)1904 STATIC DEF_SCSI_QCMD(NCR_700_queuecommand)
1905
1906 STATIC int
1907 NCR_700_abort(struct scsi_cmnd * SCp)
1908 {
1909 struct NCR_700_command_slot *slot;
1910
1911 scmd_printk(KERN_INFO, SCp, "abort command\n");
1912
1913 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1914
1915 if(slot == NULL)
1916 /* no outstanding command to abort */
1917 return SUCCESS;
1918 if(SCp->cmnd[0] == TEST_UNIT_READY) {
1919 /* FIXME: This is because of a problem in the new
1920 * error handler. When it is in error recovery, it
1921 * will send a TUR to a device it thinks may still be
1922 * showing a problem. If the TUR isn't responded to,
1923 * it will abort it and mark the device off line.
1924 * Unfortunately, it does no other error recovery, so
1925 * this would leave us with an outstanding command
1926 * occupying a slot. Rather than allow this to
1927 * happen, we issue a bus reset to force all
1928 * outstanding commands to terminate here. */
1929 NCR_700_internal_bus_reset(SCp->device->host);
1930 /* still drop through and return failed */
1931 }
1932 return FAILED;
1933
1934 }
1935
1936 STATIC int
NCR_700_host_reset(struct scsi_cmnd * SCp)1937 NCR_700_host_reset(struct scsi_cmnd * SCp)
1938 {
1939 DECLARE_COMPLETION_ONSTACK(complete);
1940 struct NCR_700_Host_Parameters *hostdata =
1941 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1942
1943 scmd_printk(KERN_INFO, SCp,
1944 "New error handler wants HOST reset, cmd %p\n\t", SCp);
1945 scsi_print_command(SCp);
1946
1947 /* In theory, eh_complete should always be null because the
1948 * eh is single threaded, but just in case we're handling a
1949 * reset via sg or something */
1950 spin_lock_irq(SCp->device->host->host_lock);
1951 while (hostdata->eh_complete != NULL) {
1952 spin_unlock_irq(SCp->device->host->host_lock);
1953 msleep_interruptible(100);
1954 spin_lock_irq(SCp->device->host->host_lock);
1955 }
1956
1957 hostdata->eh_complete = &complete;
1958 NCR_700_internal_bus_reset(SCp->device->host);
1959 NCR_700_chip_reset(SCp->device->host);
1960
1961 spin_unlock_irq(SCp->device->host->host_lock);
1962 wait_for_completion(&complete);
1963 spin_lock_irq(SCp->device->host->host_lock);
1964
1965 hostdata->eh_complete = NULL;
1966 /* Revalidate the transport parameters of the failing device */
1967 if(hostdata->fast)
1968 spi_schedule_dv_device(SCp->device);
1969
1970 spin_unlock_irq(SCp->device->host->host_lock);
1971 return SUCCESS;
1972 }
1973
1974 STATIC void
NCR_700_set_period(struct scsi_target * STp,int period)1975 NCR_700_set_period(struct scsi_target *STp, int period)
1976 {
1977 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1978 struct NCR_700_Host_Parameters *hostdata =
1979 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
1980
1981 if(!hostdata->fast)
1982 return;
1983
1984 if(period < hostdata->min_period)
1985 period = hostdata->min_period;
1986
1987 spi_period(STp) = period;
1988 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
1989 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1990 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
1991 }
1992
1993 STATIC void
NCR_700_set_offset(struct scsi_target * STp,int offset)1994 NCR_700_set_offset(struct scsi_target *STp, int offset)
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 int max_offset = hostdata->chip710
2000 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2001
2002 if(!hostdata->fast)
2003 return;
2004
2005 if(offset > max_offset)
2006 offset = max_offset;
2007
2008 /* if we're currently async, make sure the period is reasonable */
2009 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2010 spi_period(STp) > 0xff))
2011 spi_period(STp) = hostdata->min_period;
2012
2013 spi_offset(STp) = offset;
2014 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2015 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2016 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2017 }
2018
2019 STATIC int
NCR_700_slave_alloc(struct scsi_device * SDp)2020 NCR_700_slave_alloc(struct scsi_device *SDp)
2021 {
2022 SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2023 GFP_KERNEL);
2024
2025 if (!SDp->hostdata)
2026 return -ENOMEM;
2027
2028 return 0;
2029 }
2030
2031 STATIC int
NCR_700_slave_configure(struct scsi_device * SDp)2032 NCR_700_slave_configure(struct scsi_device *SDp)
2033 {
2034 struct NCR_700_Host_Parameters *hostdata =
2035 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2036
2037 /* to do here: allocate memory; build a queue_full list */
2038 if(SDp->tagged_supported) {
2039 scsi_change_queue_depth(SDp, NCR_700_DEFAULT_TAGS);
2040 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2041 }
2042
2043 if(hostdata->fast) {
2044 /* Find the correct offset and period via domain validation */
2045 if (!spi_initial_dv(SDp->sdev_target))
2046 spi_dv_device(SDp);
2047 } else {
2048 spi_offset(SDp->sdev_target) = 0;
2049 spi_period(SDp->sdev_target) = 0;
2050 }
2051 return 0;
2052 }
2053
2054 STATIC void
NCR_700_slave_destroy(struct scsi_device * SDp)2055 NCR_700_slave_destroy(struct scsi_device *SDp)
2056 {
2057 kfree(SDp->hostdata);
2058 SDp->hostdata = NULL;
2059 }
2060
2061 static int
NCR_700_change_queue_depth(struct scsi_device * SDp,int depth)2062 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2063 {
2064 if (depth > NCR_700_MAX_TAGS)
2065 depth = NCR_700_MAX_TAGS;
2066 return scsi_change_queue_depth(SDp, depth);
2067 }
2068
2069 static ssize_t
NCR_700_show_active_tags(struct device * dev,struct device_attribute * attr,char * buf)2070 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2071 {
2072 struct scsi_device *SDp = to_scsi_device(dev);
2073
2074 return sysfs_emit(buf, "%d\n", NCR_700_get_depth(SDp));
2075 }
2076
2077 static struct device_attribute NCR_700_active_tags_attr = {
2078 .attr = {
2079 .name = "active_tags",
2080 .mode = S_IRUGO,
2081 },
2082 .show = NCR_700_show_active_tags,
2083 };
2084
2085 STATIC struct attribute *NCR_700_dev_attrs[] = {
2086 &NCR_700_active_tags_attr.attr,
2087 NULL,
2088 };
2089
2090 ATTRIBUTE_GROUPS(NCR_700_dev);
2091
2092 EXPORT_SYMBOL(NCR_700_detect);
2093 EXPORT_SYMBOL(NCR_700_release);
2094 EXPORT_SYMBOL(NCR_700_intr);
2095
2096 static struct spi_function_template NCR_700_transport_functions = {
2097 .set_period = NCR_700_set_period,
2098 .show_period = 1,
2099 .set_offset = NCR_700_set_offset,
2100 .show_offset = 1,
2101 };
2102
NCR_700_init(void)2103 static int __init NCR_700_init(void)
2104 {
2105 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2106 if(!NCR_700_transport_template)
2107 return -ENODEV;
2108 return 0;
2109 }
2110
NCR_700_exit(void)2111 static void __exit NCR_700_exit(void)
2112 {
2113 spi_release_transport(NCR_700_transport_template);
2114 }
2115
2116 module_init(NCR_700_init);
2117 module_exit(NCR_700_exit);
2118
2119