xref: /openbmc/linux/drivers/scsi/53c700.c (revision 8366d1f1)
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 snprintf(buf, 20, "%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