1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Device driver for the SYMBIOS/LSILOGIC 53C8XX and 53C1010 family
4  * of PCI-SCSI IO processors.
5  *
6  * Copyright (C) 1999-2001  Gerard Roudier <groudier@free.fr>
7  * Copyright (c) 2003-2005  Matthew Wilcox <matthew@wil.cx>
8  *
9  * This driver is derived from the Linux sym53c8xx driver.
10  * Copyright (C) 1998-2000  Gerard Roudier
11  *
12  * The sym53c8xx driver is derived from the ncr53c8xx driver that had been
13  * a port of the FreeBSD ncr driver to Linux-1.2.13.
14  *
15  * The original ncr driver has been written for 386bsd and FreeBSD by
16  *         Wolfgang Stanglmeier        <wolf@cologne.de>
17  *         Stefan Esser                <se@mi.Uni-Koeln.de>
18  * Copyright (C) 1994  Wolfgang Stanglmeier
19  *
20  * Other major contributions:
21  *
22  * NVRAM detection and reading.
23  * Copyright (C) 1997 Richard Waltham <dormouse@farsrobt.demon.co.uk>
24  *
25  *-----------------------------------------------------------------------------
26  */
27 #include <linux/ctype.h>
28 #include <linux/init.h>
29 #include <linux/module.h>
30 #include <linux/moduleparam.h>
31 #include <linux/spinlock.h>
32 #include <scsi/scsi.h>
33 #include <scsi/scsi_tcq.h>
34 #include <scsi/scsi_device.h>
35 #include <scsi/scsi_transport.h>
36 
37 #include "sym_glue.h"
38 #include "sym_nvram.h"
39 
40 #define NAME53C		"sym53c"
41 #define NAME53C8XX	"sym53c8xx"
42 
43 struct sym_driver_setup sym_driver_setup = SYM_LINUX_DRIVER_SETUP;
44 unsigned int sym_debug_flags = 0;
45 
46 static char *excl_string;
47 static char *safe_string;
48 module_param_named(cmd_per_lun, sym_driver_setup.max_tag, ushort, 0);
49 module_param_named(burst, sym_driver_setup.burst_order, byte, 0);
50 module_param_named(led, sym_driver_setup.scsi_led, byte, 0);
51 module_param_named(diff, sym_driver_setup.scsi_diff, byte, 0);
52 module_param_named(irqm, sym_driver_setup.irq_mode, byte, 0);
53 module_param_named(buschk, sym_driver_setup.scsi_bus_check, byte, 0);
54 module_param_named(hostid, sym_driver_setup.host_id, byte, 0);
55 module_param_named(verb, sym_driver_setup.verbose, byte, 0);
56 module_param_named(debug, sym_debug_flags, uint, 0);
57 module_param_named(settle, sym_driver_setup.settle_delay, byte, 0);
58 module_param_named(nvram, sym_driver_setup.use_nvram, byte, 0);
59 module_param_named(excl, excl_string, charp, 0);
60 module_param_named(safe, safe_string, charp, 0);
61 
62 MODULE_PARM_DESC(cmd_per_lun, "The maximum number of tags to use by default");
63 MODULE_PARM_DESC(burst, "Maximum burst.  0 to disable, 255 to read from registers");
64 MODULE_PARM_DESC(led, "Set to 1 to enable LED support");
65 MODULE_PARM_DESC(diff, "0 for no differential mode, 1 for BIOS, 2 for always, 3 for not GPIO3");
66 MODULE_PARM_DESC(irqm, "0 for open drain, 1 to leave alone, 2 for totem pole");
67 MODULE_PARM_DESC(buschk, "0 to not check, 1 for detach on error, 2 for warn on error");
68 MODULE_PARM_DESC(hostid, "The SCSI ID to use for the host adapters");
69 MODULE_PARM_DESC(verb, "0 for minimal verbosity, 1 for normal, 2 for excessive");
70 MODULE_PARM_DESC(debug, "Set bits to enable debugging");
71 MODULE_PARM_DESC(settle, "Settle delay in seconds.  Default 3");
72 MODULE_PARM_DESC(nvram, "Option currently not used");
73 MODULE_PARM_DESC(excl, "List ioport addresses here to prevent controllers from being attached");
74 MODULE_PARM_DESC(safe, "Set other settings to a \"safe mode\"");
75 
76 MODULE_LICENSE("GPL");
77 MODULE_VERSION(SYM_VERSION);
78 MODULE_AUTHOR("Matthew Wilcox <matthew@wil.cx>");
79 MODULE_DESCRIPTION("NCR, Symbios and LSI 8xx and 1010 PCI SCSI adapters");
80 
81 static void sym2_setup_params(void)
82 {
83 	char *p = excl_string;
84 	int xi = 0;
85 
86 	while (p && (xi < 8)) {
87 		char *next_p;
88 		int val = (int) simple_strtoul(p, &next_p, 0);
89 		sym_driver_setup.excludes[xi++] = val;
90 		p = next_p;
91 	}
92 
93 	if (safe_string) {
94 		if (*safe_string == 'y') {
95 			sym_driver_setup.max_tag = 0;
96 			sym_driver_setup.burst_order = 0;
97 			sym_driver_setup.scsi_led = 0;
98 			sym_driver_setup.scsi_diff = 1;
99 			sym_driver_setup.irq_mode = 0;
100 			sym_driver_setup.scsi_bus_check = 2;
101 			sym_driver_setup.host_id = 7;
102 			sym_driver_setup.verbose = 2;
103 			sym_driver_setup.settle_delay = 10;
104 			sym_driver_setup.use_nvram = 1;
105 		} else if (*safe_string != 'n') {
106 			printk(KERN_WARNING NAME53C8XX "Ignoring parameter %s"
107 					" passed to safe option", safe_string);
108 		}
109 	}
110 }
111 
112 static struct scsi_transport_template *sym2_transport_template = NULL;
113 
114 /*
115  *  Driver private area in the SCSI command structure.
116  */
117 struct sym_ucmd {		/* Override the SCSI pointer structure */
118 	struct completion *eh_done;		/* SCSI error handling */
119 };
120 
121 #define SYM_UCMD_PTR(cmd)  ((struct sym_ucmd *)scsi_cmd_priv(cmd))
122 #define SYM_SOFTC_PTR(cmd) sym_get_hcb(cmd->device->host)
123 
124 /*
125  *  Complete a pending CAM CCB.
126  */
127 void sym_xpt_done(struct sym_hcb *np, struct scsi_cmnd *cmd)
128 {
129 	struct sym_ucmd *ucmd = SYM_UCMD_PTR(cmd);
130 
131 	if (ucmd->eh_done)
132 		complete(ucmd->eh_done);
133 
134 	scsi_dma_unmap(cmd);
135 	scsi_done(cmd);
136 }
137 
138 /*
139  *  Tell the SCSI layer about a BUS RESET.
140  */
141 void sym_xpt_async_bus_reset(struct sym_hcb *np)
142 {
143 	printf_notice("%s: SCSI BUS has been reset.\n", sym_name(np));
144 	np->s.settle_time = jiffies + sym_driver_setup.settle_delay * HZ;
145 	np->s.settle_time_valid = 1;
146 	if (sym_verbose >= 2)
147 		printf_info("%s: command processing suspended for %d seconds\n",
148 			    sym_name(np), sym_driver_setup.settle_delay);
149 }
150 
151 /*
152  *  Choose the more appropriate CAM status if
153  *  the IO encountered an extended error.
154  */
155 static int sym_xerr_cam_status(int cam_status, int x_status)
156 {
157 	if (x_status) {
158 		if (x_status & XE_PARITY_ERR)
159 			cam_status = DID_PARITY;
160 		else
161 			cam_status = DID_ERROR;
162 	}
163 	return cam_status;
164 }
165 
166 /*
167  *  Build CAM result for a failed or auto-sensed IO.
168  */
169 void sym_set_cam_result_error(struct sym_hcb *np, struct sym_ccb *cp, int resid)
170 {
171 	struct scsi_cmnd *cmd = cp->cmd;
172 	u_int cam_status, scsi_status;
173 
174 	cam_status  = DID_OK;
175 	scsi_status = cp->ssss_status;
176 
177 	if (cp->host_flags & HF_SENSE) {
178 		scsi_status = cp->sv_scsi_status;
179 		resid = cp->sv_resid;
180 		if (sym_verbose && cp->sv_xerr_status)
181 			sym_print_xerr(cmd, cp->sv_xerr_status);
182 		if (cp->host_status == HS_COMPLETE &&
183 		    cp->ssss_status == S_GOOD &&
184 		    cp->xerr_status == 0) {
185 			cam_status = sym_xerr_cam_status(DID_OK,
186 							 cp->sv_xerr_status);
187 			/*
188 			 *  Bounce back the sense data to user.
189 			 */
190 			memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
191 			memcpy(cmd->sense_buffer, cp->sns_bbuf,
192 			       min(SCSI_SENSE_BUFFERSIZE, SYM_SNS_BBUF_LEN));
193 #if 0
194 			/*
195 			 *  If the device reports a UNIT ATTENTION condition
196 			 *  due to a RESET condition, we should consider all
197 			 *  disconnect CCBs for this unit as aborted.
198 			 */
199 			if (1) {
200 				u_char *p;
201 				p  = (u_char *) cmd->sense_data;
202 				if (p[0]==0x70 && p[2]==0x6 && p[12]==0x29)
203 					sym_clear_tasks(np, DID_ABORT,
204 							cp->target,cp->lun, -1);
205 			}
206 #endif
207 		} else {
208 			/*
209 			 * Error return from our internal request sense.  This
210 			 * is bad: we must clear the contingent allegiance
211 			 * condition otherwise the device will always return
212 			 * BUSY.  Use a big stick.
213 			 */
214 			sym_reset_scsi_target(np, cmd->device->id);
215 			cam_status = DID_ERROR;
216 		}
217 	} else if (cp->host_status == HS_COMPLETE) 	/* Bad SCSI status */
218 		cam_status = DID_OK;
219 	else if (cp->host_status == HS_SEL_TIMEOUT)	/* Selection timeout */
220 		cam_status = DID_NO_CONNECT;
221 	else if (cp->host_status == HS_UNEXPECTED)	/* Unexpected BUS FREE*/
222 		cam_status = DID_ERROR;
223 	else {						/* Extended error */
224 		if (sym_verbose) {
225 			sym_print_addr(cmd, "COMMAND FAILED (%x %x %x).\n",
226 				cp->host_status, cp->ssss_status,
227 				cp->xerr_status);
228 		}
229 		/*
230 		 *  Set the most appropriate value for CAM status.
231 		 */
232 		cam_status = sym_xerr_cam_status(DID_ERROR, cp->xerr_status);
233 	}
234 	scsi_set_resid(cmd, resid);
235 	cmd->result = (cam_status << 16) | scsi_status;
236 }
237 
238 static int sym_scatter(struct sym_hcb *np, struct sym_ccb *cp, struct scsi_cmnd *cmd)
239 {
240 	int segment;
241 	int use_sg;
242 
243 	cp->data_len = 0;
244 
245 	use_sg = scsi_dma_map(cmd);
246 	if (use_sg > 0) {
247 		struct scatterlist *sg;
248 		struct sym_tcb *tp = &np->target[cp->target];
249 		struct sym_tblmove *data;
250 
251 		if (use_sg > SYM_CONF_MAX_SG) {
252 			scsi_dma_unmap(cmd);
253 			return -1;
254 		}
255 
256 		data = &cp->phys.data[SYM_CONF_MAX_SG - use_sg];
257 
258 		scsi_for_each_sg(cmd, sg, use_sg, segment) {
259 			dma_addr_t baddr = sg_dma_address(sg);
260 			unsigned int len = sg_dma_len(sg);
261 
262 			if ((len & 1) && (tp->head.wval & EWS)) {
263 				len++;
264 				cp->odd_byte_adjustment++;
265 			}
266 
267 			sym_build_sge(np, &data[segment], baddr, len);
268 			cp->data_len += len;
269 		}
270 	} else {
271 		segment = -2;
272 	}
273 
274 	return segment;
275 }
276 
277 /*
278  *  Queue a SCSI command.
279  */
280 static int sym_queue_command(struct sym_hcb *np, struct scsi_cmnd *cmd)
281 {
282 	struct scsi_device *sdev = cmd->device;
283 	struct sym_tcb *tp;
284 	struct sym_lcb *lp;
285 	struct sym_ccb *cp;
286 	int	order;
287 
288 	/*
289 	 *  Retrieve the target descriptor.
290 	 */
291 	tp = &np->target[sdev->id];
292 
293 	/*
294 	 *  Select tagged/untagged.
295 	 */
296 	lp = sym_lp(tp, sdev->lun);
297 	order = (lp && lp->s.reqtags) ? M_SIMPLE_TAG : 0;
298 
299 	/*
300 	 *  Queue the SCSI IO.
301 	 */
302 	cp = sym_get_ccb(np, cmd, order);
303 	if (!cp)
304 		return 1;	/* Means resource shortage */
305 	sym_queue_scsiio(np, cmd, cp);
306 	return 0;
307 }
308 
309 /*
310  *  Setup buffers and pointers that address the CDB.
311  */
312 static inline int sym_setup_cdb(struct sym_hcb *np, struct scsi_cmnd *cmd, struct sym_ccb *cp)
313 {
314 	memcpy(cp->cdb_buf, cmd->cmnd, cmd->cmd_len);
315 
316 	cp->phys.cmd.addr = CCB_BA(cp, cdb_buf[0]);
317 	cp->phys.cmd.size = cpu_to_scr(cmd->cmd_len);
318 
319 	return 0;
320 }
321 
322 /*
323  *  Setup pointers that address the data and start the I/O.
324  */
325 int sym_setup_data_and_start(struct sym_hcb *np, struct scsi_cmnd *cmd, struct sym_ccb *cp)
326 {
327 	u32 lastp, goalp;
328 	int dir;
329 
330 	/*
331 	 *  Build the CDB.
332 	 */
333 	if (sym_setup_cdb(np, cmd, cp))
334 		goto out_abort;
335 
336 	/*
337 	 *  No direction means no data.
338 	 */
339 	dir = cmd->sc_data_direction;
340 	if (dir != DMA_NONE) {
341 		cp->segments = sym_scatter(np, cp, cmd);
342 		if (cp->segments < 0) {
343 			sym_set_cam_status(cmd, DID_ERROR);
344 			goto out_abort;
345 		}
346 
347 		/*
348 		 *  No segments means no data.
349 		 */
350 		if (!cp->segments)
351 			dir = DMA_NONE;
352 	} else {
353 		cp->data_len = 0;
354 		cp->segments = 0;
355 	}
356 
357 	/*
358 	 *  Set the data pointer.
359 	 */
360 	switch (dir) {
361 	case DMA_BIDIRECTIONAL:
362 		scmd_printk(KERN_INFO, cmd, "got DMA_BIDIRECTIONAL command");
363 		sym_set_cam_status(cmd, DID_ERROR);
364 		goto out_abort;
365 	case DMA_TO_DEVICE:
366 		goalp = SCRIPTA_BA(np, data_out2) + 8;
367 		lastp = goalp - 8 - (cp->segments * (2*4));
368 		break;
369 	case DMA_FROM_DEVICE:
370 		cp->host_flags |= HF_DATA_IN;
371 		goalp = SCRIPTA_BA(np, data_in2) + 8;
372 		lastp = goalp - 8 - (cp->segments * (2*4));
373 		break;
374 	case DMA_NONE:
375 	default:
376 		lastp = goalp = SCRIPTB_BA(np, no_data);
377 		break;
378 	}
379 
380 	/*
381 	 *  Set all pointers values needed by SCRIPTS.
382 	 */
383 	cp->phys.head.lastp = cpu_to_scr(lastp);
384 	cp->phys.head.savep = cpu_to_scr(lastp);
385 	cp->startp	    = cp->phys.head.savep;
386 	cp->goalp	    = cpu_to_scr(goalp);
387 
388 	/*
389 	 *  When `#ifed 1', the code below makes the driver
390 	 *  panic on the first attempt to write to a SCSI device.
391 	 *  It is the first test we want to do after a driver
392 	 *  change that does not seem obviously safe. :)
393 	 */
394 #if 0
395 	switch (cp->cdb_buf[0]) {
396 	case 0x0A: case 0x2A: case 0xAA:
397 		panic("XXXXXXXXXXXXX WRITE NOT YET ALLOWED XXXXXXXXXXXXXX\n");
398 		break;
399 	default:
400 		break;
401 	}
402 #endif
403 
404 	/*
405 	 *	activate this job.
406 	 */
407 	sym_put_start_queue(np, cp);
408 	return 0;
409 
410 out_abort:
411 	sym_free_ccb(np, cp);
412 	sym_xpt_done(np, cmd);
413 	return 0;
414 }
415 
416 
417 /*
418  *  timer daemon.
419  *
420  *  Misused to keep the driver running when
421  *  interrupts are not configured correctly.
422  */
423 static void sym_timer(struct sym_hcb *np)
424 {
425 	unsigned long thistime = jiffies;
426 
427 	/*
428 	 *  Restart the timer.
429 	 */
430 	np->s.timer.expires = thistime + SYM_CONF_TIMER_INTERVAL;
431 	add_timer(&np->s.timer);
432 
433 	/*
434 	 *  If we are resetting the ncr, wait for settle_time before
435 	 *  clearing it. Then command processing will be resumed.
436 	 */
437 	if (np->s.settle_time_valid) {
438 		if (time_before_eq(np->s.settle_time, thistime)) {
439 			if (sym_verbose >= 2 )
440 				printk("%s: command processing resumed\n",
441 				       sym_name(np));
442 			np->s.settle_time_valid = 0;
443 		}
444 		return;
445 	}
446 
447 	/*
448 	 *	Nothing to do for now, but that may come.
449 	 */
450 	if (np->s.lasttime + 4*HZ < thistime) {
451 		np->s.lasttime = thistime;
452 	}
453 
454 #ifdef SYM_CONF_PCIQ_MAY_MISS_COMPLETIONS
455 	/*
456 	 *  Some way-broken PCI bridges may lead to
457 	 *  completions being lost when the clearing
458 	 *  of the INTFLY flag by the CPU occurs
459 	 *  concurrently with the chip raising this flag.
460 	 *  If this ever happen, lost completions will
461 	 * be reaped here.
462 	 */
463 	sym_wakeup_done(np);
464 #endif
465 }
466 
467 
468 /*
469  *  PCI BUS error handler.
470  */
471 void sym_log_bus_error(struct Scsi_Host *shost)
472 {
473 	struct sym_data *sym_data = shost_priv(shost);
474 	struct pci_dev *pdev = sym_data->pdev;
475 	unsigned short pci_sts;
476 	pci_read_config_word(pdev, PCI_STATUS, &pci_sts);
477 	if (pci_sts & 0xf900) {
478 		pci_write_config_word(pdev, PCI_STATUS, pci_sts);
479 		shost_printk(KERN_WARNING, shost,
480 			"PCI bus error: status = 0x%04x\n", pci_sts & 0xf900);
481 	}
482 }
483 
484 /*
485  * queuecommand method.  Entered with the host adapter lock held and
486  * interrupts disabled.
487  */
488 static int sym53c8xx_queue_command_lck(struct scsi_cmnd *cmd)
489 {
490 	struct sym_hcb *np = SYM_SOFTC_PTR(cmd);
491 	struct sym_ucmd *ucp = SYM_UCMD_PTR(cmd);
492 	int sts = 0;
493 
494 	memset(ucp, 0, sizeof(*ucp));
495 
496 	/*
497 	 *  Shorten our settle_time if needed for
498 	 *  this command not to time out.
499 	 */
500 	if (np->s.settle_time_valid && scsi_cmd_to_rq(cmd)->timeout) {
501 		unsigned long tlimit = jiffies + scsi_cmd_to_rq(cmd)->timeout;
502 		tlimit -= SYM_CONF_TIMER_INTERVAL*2;
503 		if (time_after(np->s.settle_time, tlimit)) {
504 			np->s.settle_time = tlimit;
505 		}
506 	}
507 
508 	if (np->s.settle_time_valid)
509 		return SCSI_MLQUEUE_HOST_BUSY;
510 
511 	sts = sym_queue_command(np, cmd);
512 	if (sts)
513 		return SCSI_MLQUEUE_HOST_BUSY;
514 	return 0;
515 }
516 
517 static DEF_SCSI_QCMD(sym53c8xx_queue_command)
518 
519 /*
520  *  Linux entry point of the interrupt handler.
521  */
522 static irqreturn_t sym53c8xx_intr(int irq, void *dev_id)
523 {
524 	struct Scsi_Host *shost = dev_id;
525 	struct sym_data *sym_data = shost_priv(shost);
526 	irqreturn_t result;
527 
528 	/* Avoid spinloop trying to handle interrupts on frozen device */
529 	if (pci_channel_offline(sym_data->pdev))
530 		return IRQ_NONE;
531 
532 	if (DEBUG_FLAGS & DEBUG_TINY) printf_debug ("[");
533 
534 	spin_lock(shost->host_lock);
535 	result = sym_interrupt(shost);
536 	spin_unlock(shost->host_lock);
537 
538 	if (DEBUG_FLAGS & DEBUG_TINY) printf_debug ("]\n");
539 
540 	return result;
541 }
542 
543 /*
544  *  Linux entry point of the timer handler
545  */
546 static void sym53c8xx_timer(struct timer_list *t)
547 {
548 	struct sym_hcb *np = from_timer(np, t, s.timer);
549 	unsigned long flags;
550 
551 	spin_lock_irqsave(np->s.host->host_lock, flags);
552 	sym_timer(np);
553 	spin_unlock_irqrestore(np->s.host->host_lock, flags);
554 }
555 
556 
557 /*
558  *  What the eh thread wants us to perform.
559  */
560 #define SYM_EH_ABORT		0
561 #define SYM_EH_DEVICE_RESET	1
562 #define SYM_EH_BUS_RESET	2
563 #define SYM_EH_HOST_RESET	3
564 
565 /*
566  *  Generic method for our eh processing.
567  *  The 'op' argument tells what we have to do.
568  */
569 static int sym_eh_handler(int op, char *opname, struct scsi_cmnd *cmd)
570 {
571 	struct sym_ucmd *ucmd = SYM_UCMD_PTR(cmd);
572 	struct Scsi_Host *shost = cmd->device->host;
573 	struct sym_data *sym_data = shost_priv(shost);
574 	struct pci_dev *pdev = sym_data->pdev;
575 	struct sym_hcb *np = sym_data->ncb;
576 	SYM_QUEHEAD *qp;
577 	int cmd_queued = 0;
578 	int sts = -1;
579 	struct completion eh_done;
580 
581 	scmd_printk(KERN_WARNING, cmd, "%s operation started\n", opname);
582 
583 	/* We may be in an error condition because the PCI bus
584 	 * went down. In this case, we need to wait until the
585 	 * PCI bus is reset, the card is reset, and only then
586 	 * proceed with the scsi error recovery.  There's no
587 	 * point in hurrying; take a leisurely wait.
588 	 */
589 #define WAIT_FOR_PCI_RECOVERY	35
590 	if (pci_channel_offline(pdev)) {
591 		int finished_reset = 0;
592 		init_completion(&eh_done);
593 		spin_lock_irq(shost->host_lock);
594 		/* Make sure we didn't race */
595 		if (pci_channel_offline(pdev)) {
596 			BUG_ON(sym_data->io_reset);
597 			sym_data->io_reset = &eh_done;
598 		} else {
599 			finished_reset = 1;
600 		}
601 		spin_unlock_irq(shost->host_lock);
602 		if (!finished_reset)
603 			finished_reset = wait_for_completion_timeout
604 						(sym_data->io_reset,
605 						WAIT_FOR_PCI_RECOVERY*HZ);
606 		spin_lock_irq(shost->host_lock);
607 		sym_data->io_reset = NULL;
608 		spin_unlock_irq(shost->host_lock);
609 		if (!finished_reset)
610 			return SCSI_FAILED;
611 	}
612 
613 	spin_lock_irq(shost->host_lock);
614 	/* This one is queued in some place -> to wait for completion */
615 	FOR_EACH_QUEUED_ELEMENT(&np->busy_ccbq, qp) {
616 		struct sym_ccb *cp = sym_que_entry(qp, struct sym_ccb, link_ccbq);
617 		if (cp->cmd == cmd) {
618 			cmd_queued = 1;
619 			break;
620 		}
621 	}
622 
623 	/* Try to proceed the operation we have been asked for */
624 	sts = -1;
625 	switch(op) {
626 	case SYM_EH_ABORT:
627 		sts = sym_abort_scsiio(np, cmd, 1);
628 		break;
629 	case SYM_EH_DEVICE_RESET:
630 		sts = sym_reset_scsi_target(np, cmd->device->id);
631 		break;
632 	case SYM_EH_BUS_RESET:
633 		sym_reset_scsi_bus(np, 1);
634 		sts = 0;
635 		break;
636 	case SYM_EH_HOST_RESET:
637 		sym_reset_scsi_bus(np, 0);
638 		sym_start_up(shost, 1);
639 		sts = 0;
640 		break;
641 	default:
642 		break;
643 	}
644 
645 	/* On error, restore everything and cross fingers :) */
646 	if (sts)
647 		cmd_queued = 0;
648 
649 	if (cmd_queued) {
650 		init_completion(&eh_done);
651 		ucmd->eh_done = &eh_done;
652 		spin_unlock_irq(shost->host_lock);
653 		if (!wait_for_completion_timeout(&eh_done, 5*HZ)) {
654 			ucmd->eh_done = NULL;
655 			sts = -2;
656 		}
657 	} else {
658 		spin_unlock_irq(shost->host_lock);
659 	}
660 
661 	dev_warn(&cmd->device->sdev_gendev, "%s operation %s.\n", opname,
662 			sts==0 ? "complete" :sts==-2 ? "timed-out" : "failed");
663 	return sts ? SCSI_FAILED : SCSI_SUCCESS;
664 }
665 
666 
667 /*
668  * Error handlers called from the eh thread (one thread per HBA).
669  */
670 static int sym53c8xx_eh_abort_handler(struct scsi_cmnd *cmd)
671 {
672 	return sym_eh_handler(SYM_EH_ABORT, "ABORT", cmd);
673 }
674 
675 static int sym53c8xx_eh_device_reset_handler(struct scsi_cmnd *cmd)
676 {
677 	return sym_eh_handler(SYM_EH_DEVICE_RESET, "DEVICE RESET", cmd);
678 }
679 
680 static int sym53c8xx_eh_bus_reset_handler(struct scsi_cmnd *cmd)
681 {
682 	return sym_eh_handler(SYM_EH_BUS_RESET, "BUS RESET", cmd);
683 }
684 
685 static int sym53c8xx_eh_host_reset_handler(struct scsi_cmnd *cmd)
686 {
687 	return sym_eh_handler(SYM_EH_HOST_RESET, "HOST RESET", cmd);
688 }
689 
690 /*
691  *  Tune device queuing depth, according to various limits.
692  */
693 static void sym_tune_dev_queuing(struct sym_tcb *tp, int lun, u_short reqtags)
694 {
695 	struct sym_lcb *lp = sym_lp(tp, lun);
696 	u_short	oldtags;
697 
698 	if (!lp)
699 		return;
700 
701 	oldtags = lp->s.reqtags;
702 
703 	if (reqtags > lp->s.scdev_depth)
704 		reqtags = lp->s.scdev_depth;
705 
706 	lp->s.reqtags     = reqtags;
707 
708 	if (reqtags != oldtags) {
709 		dev_info(&tp->starget->dev,
710 		         "tagged command queuing %s, command queue depth %d.\n",
711 		          lp->s.reqtags ? "enabled" : "disabled", reqtags);
712 	}
713 }
714 
715 static int sym53c8xx_slave_alloc(struct scsi_device *sdev)
716 {
717 	struct sym_hcb *np = sym_get_hcb(sdev->host);
718 	struct sym_tcb *tp = &np->target[sdev->id];
719 	struct sym_lcb *lp;
720 	unsigned long flags;
721 	int error;
722 
723 	if (sdev->id >= SYM_CONF_MAX_TARGET || sdev->lun >= SYM_CONF_MAX_LUN)
724 		return -ENXIO;
725 
726 	spin_lock_irqsave(np->s.host->host_lock, flags);
727 
728 	/*
729 	 * Fail the device init if the device is flagged NOSCAN at BOOT in
730 	 * the NVRAM.  This may speed up boot and maintain coherency with
731 	 * BIOS device numbering.  Clearing the flag allows the user to
732 	 * rescan skipped devices later.  We also return an error for
733 	 * devices not flagged for SCAN LUNS in the NVRAM since some single
734 	 * lun devices behave badly when asked for a non zero LUN.
735 	 */
736 
737 	if (tp->usrflags & SYM_SCAN_BOOT_DISABLED) {
738 		tp->usrflags &= ~SYM_SCAN_BOOT_DISABLED;
739 		starget_printk(KERN_INFO, sdev->sdev_target,
740 				"Scan at boot disabled in NVRAM\n");
741 		error = -ENXIO;
742 		goto out;
743 	}
744 
745 	if (tp->usrflags & SYM_SCAN_LUNS_DISABLED) {
746 		if (sdev->lun != 0) {
747 			error = -ENXIO;
748 			goto out;
749 		}
750 		starget_printk(KERN_INFO, sdev->sdev_target,
751 				"Multiple LUNs disabled in NVRAM\n");
752 	}
753 
754 	lp = sym_alloc_lcb(np, sdev->id, sdev->lun);
755 	if (!lp) {
756 		error = -ENOMEM;
757 		goto out;
758 	}
759 	if (tp->nlcb == 1)
760 		tp->starget = sdev->sdev_target;
761 
762 	spi_min_period(tp->starget) = tp->usr_period;
763 	spi_max_width(tp->starget) = tp->usr_width;
764 
765 	error = 0;
766 out:
767 	spin_unlock_irqrestore(np->s.host->host_lock, flags);
768 
769 	return error;
770 }
771 
772 /*
773  * Linux entry point for device queue sizing.
774  */
775 static int sym53c8xx_slave_configure(struct scsi_device *sdev)
776 {
777 	struct sym_hcb *np = sym_get_hcb(sdev->host);
778 	struct sym_tcb *tp = &np->target[sdev->id];
779 	struct sym_lcb *lp = sym_lp(tp, sdev->lun);
780 	int reqtags, depth_to_use;
781 
782 	/*
783 	 *  Get user flags.
784 	 */
785 	lp->curr_flags = lp->user_flags;
786 
787 	/*
788 	 *  Select queue depth from driver setup.
789 	 *  Do not use more than configured by user.
790 	 *  Use at least 1.
791 	 *  Do not use more than our maximum.
792 	 */
793 	reqtags = sym_driver_setup.max_tag;
794 	if (reqtags > tp->usrtags)
795 		reqtags = tp->usrtags;
796 	if (!sdev->tagged_supported)
797 		reqtags = 0;
798 	if (reqtags > SYM_CONF_MAX_TAG)
799 		reqtags = SYM_CONF_MAX_TAG;
800 	depth_to_use = reqtags ? reqtags : 1;
801 	scsi_change_queue_depth(sdev, depth_to_use);
802 	lp->s.scdev_depth = depth_to_use;
803 	sym_tune_dev_queuing(tp, sdev->lun, reqtags);
804 
805 	if (!spi_initial_dv(sdev->sdev_target))
806 		spi_dv_device(sdev);
807 
808 	return 0;
809 }
810 
811 static void sym53c8xx_slave_destroy(struct scsi_device *sdev)
812 {
813 	struct sym_hcb *np = sym_get_hcb(sdev->host);
814 	struct sym_tcb *tp = &np->target[sdev->id];
815 	struct sym_lcb *lp = sym_lp(tp, sdev->lun);
816 	unsigned long flags;
817 
818 	/* if slave_alloc returned before allocating a sym_lcb, return */
819 	if (!lp)
820 		return;
821 
822 	spin_lock_irqsave(np->s.host->host_lock, flags);
823 
824 	if (lp->busy_itlq || lp->busy_itl) {
825 		/*
826 		 * This really shouldn't happen, but we can't return an error
827 		 * so let's try to stop all on-going I/O.
828 		 */
829 		starget_printk(KERN_WARNING, tp->starget,
830 			       "Removing busy LCB (%d)\n", (u8)sdev->lun);
831 		sym_reset_scsi_bus(np, 1);
832 	}
833 
834 	if (sym_free_lcb(np, sdev->id, sdev->lun) == 0) {
835 		/*
836 		 * It was the last unit for this target.
837 		 */
838 		tp->head.sval        = 0;
839 		tp->head.wval        = np->rv_scntl3;
840 		tp->head.uval        = 0;
841 		tp->tgoal.check_nego = 1;
842 		tp->starget	     = NULL;
843 	}
844 
845 	spin_unlock_irqrestore(np->s.host->host_lock, flags);
846 }
847 
848 /*
849  *  Linux entry point for info() function
850  */
851 static const char *sym53c8xx_info (struct Scsi_Host *host)
852 {
853 	return SYM_DRIVER_NAME;
854 }
855 
856 
857 #ifdef SYM_LINUX_PROC_INFO_SUPPORT
858 /*
859  *  Proc file system stuff
860  *
861  *  A read operation returns adapter information.
862  *  A write operation is a control command.
863  *  The string is parsed in the driver code and the command is passed
864  *  to the sym_usercmd() function.
865  */
866 
867 #ifdef SYM_LINUX_USER_COMMAND_SUPPORT
868 
869 struct	sym_usrcmd {
870 	u_long	target;
871 	u_long	lun;
872 	u_long	data;
873 	u_long	cmd;
874 };
875 
876 #define UC_SETSYNC      10
877 #define UC_SETTAGS	11
878 #define UC_SETDEBUG	12
879 #define UC_SETWIDE	14
880 #define UC_SETFLAG	15
881 #define UC_SETVERBOSE	17
882 #define UC_RESETDEV	18
883 #define UC_CLEARDEV	19
884 
885 static void sym_exec_user_command (struct sym_hcb *np, struct sym_usrcmd *uc)
886 {
887 	struct sym_tcb *tp;
888 	int t, l;
889 
890 	switch (uc->cmd) {
891 	case 0: return;
892 
893 #ifdef SYM_LINUX_DEBUG_CONTROL_SUPPORT
894 	case UC_SETDEBUG:
895 		sym_debug_flags = uc->data;
896 		break;
897 #endif
898 	case UC_SETVERBOSE:
899 		np->verbose = uc->data;
900 		break;
901 	default:
902 		/*
903 		 * We assume that other commands apply to targets.
904 		 * This should always be the case and avoid the below
905 		 * 4 lines to be repeated 6 times.
906 		 */
907 		for (t = 0; t < SYM_CONF_MAX_TARGET; t++) {
908 			if (!((uc->target >> t) & 1))
909 				continue;
910 			tp = &np->target[t];
911 			if (!tp->nlcb)
912 				continue;
913 
914 			switch (uc->cmd) {
915 
916 			case UC_SETSYNC:
917 				if (!uc->data || uc->data >= 255) {
918 					tp->tgoal.iu = tp->tgoal.dt =
919 						tp->tgoal.qas = 0;
920 					tp->tgoal.offset = 0;
921 				} else if (uc->data <= 9 && np->minsync_dt) {
922 					if (uc->data < np->minsync_dt)
923 						uc->data = np->minsync_dt;
924 					tp->tgoal.iu = tp->tgoal.dt =
925 						tp->tgoal.qas = 1;
926 					tp->tgoal.width = 1;
927 					tp->tgoal.period = uc->data;
928 					tp->tgoal.offset = np->maxoffs_dt;
929 				} else {
930 					if (uc->data < np->minsync)
931 						uc->data = np->minsync;
932 					tp->tgoal.iu = tp->tgoal.dt =
933 						tp->tgoal.qas = 0;
934 					tp->tgoal.period = uc->data;
935 					tp->tgoal.offset = np->maxoffs;
936 				}
937 				tp->tgoal.check_nego = 1;
938 				break;
939 			case UC_SETWIDE:
940 				tp->tgoal.width = uc->data ? 1 : 0;
941 				tp->tgoal.check_nego = 1;
942 				break;
943 			case UC_SETTAGS:
944 				for (l = 0; l < SYM_CONF_MAX_LUN; l++)
945 					sym_tune_dev_queuing(tp, l, uc->data);
946 				break;
947 			case UC_RESETDEV:
948 				tp->to_reset = 1;
949 				np->istat_sem = SEM;
950 				OUTB(np, nc_istat, SIGP|SEM);
951 				break;
952 			case UC_CLEARDEV:
953 				for (l = 0; l < SYM_CONF_MAX_LUN; l++) {
954 					struct sym_lcb *lp = sym_lp(tp, l);
955 					if (lp) lp->to_clear = 1;
956 				}
957 				np->istat_sem = SEM;
958 				OUTB(np, nc_istat, SIGP|SEM);
959 				break;
960 			case UC_SETFLAG:
961 				tp->usrflags = uc->data;
962 				break;
963 			}
964 		}
965 		break;
966 	}
967 }
968 
969 static int sym_skip_spaces(char *ptr, int len)
970 {
971 	int cnt, c;
972 
973 	for (cnt = len; cnt > 0 && (c = *ptr++) && isspace(c); cnt--);
974 
975 	return (len - cnt);
976 }
977 
978 static int get_int_arg(char *ptr, int len, u_long *pv)
979 {
980 	char *end;
981 
982 	*pv = simple_strtoul(ptr, &end, 10);
983 	return (end - ptr);
984 }
985 
986 static int is_keyword(char *ptr, int len, char *verb)
987 {
988 	int verb_len = strlen(verb);
989 
990 	if (len >= verb_len && !memcmp(verb, ptr, verb_len))
991 		return verb_len;
992 	else
993 		return 0;
994 }
995 
996 #define SKIP_SPACES(ptr, len)						\
997 	if ((arg_len = sym_skip_spaces(ptr, len)) < 1)			\
998 		return -EINVAL;						\
999 	ptr += arg_len; len -= arg_len;
1000 
1001 #define GET_INT_ARG(ptr, len, v)					\
1002 	if (!(arg_len = get_int_arg(ptr, len, &(v))))			\
1003 		return -EINVAL;						\
1004 	ptr += arg_len; len -= arg_len;
1005 
1006 
1007 /*
1008  * Parse a control command
1009  */
1010 
1011 static int sym_user_command(struct Scsi_Host *shost, char *buffer, int length)
1012 {
1013 	struct sym_hcb *np = sym_get_hcb(shost);
1014 	char *ptr	= buffer;
1015 	int len		= length;
1016 	struct sym_usrcmd cmd, *uc = &cmd;
1017 	int		arg_len;
1018 	u_long 		target;
1019 
1020 	memset(uc, 0, sizeof(*uc));
1021 
1022 	if (len > 0 && ptr[len-1] == '\n')
1023 		--len;
1024 
1025 	if	((arg_len = is_keyword(ptr, len, "setsync")) != 0)
1026 		uc->cmd = UC_SETSYNC;
1027 	else if	((arg_len = is_keyword(ptr, len, "settags")) != 0)
1028 		uc->cmd = UC_SETTAGS;
1029 	else if	((arg_len = is_keyword(ptr, len, "setverbose")) != 0)
1030 		uc->cmd = UC_SETVERBOSE;
1031 	else if	((arg_len = is_keyword(ptr, len, "setwide")) != 0)
1032 		uc->cmd = UC_SETWIDE;
1033 #ifdef SYM_LINUX_DEBUG_CONTROL_SUPPORT
1034 	else if	((arg_len = is_keyword(ptr, len, "setdebug")) != 0)
1035 		uc->cmd = UC_SETDEBUG;
1036 #endif
1037 	else if	((arg_len = is_keyword(ptr, len, "setflag")) != 0)
1038 		uc->cmd = UC_SETFLAG;
1039 	else if	((arg_len = is_keyword(ptr, len, "resetdev")) != 0)
1040 		uc->cmd = UC_RESETDEV;
1041 	else if	((arg_len = is_keyword(ptr, len, "cleardev")) != 0)
1042 		uc->cmd = UC_CLEARDEV;
1043 	else
1044 		arg_len = 0;
1045 
1046 #ifdef DEBUG_PROC_INFO
1047 printk("sym_user_command: arg_len=%d, cmd=%ld\n", arg_len, uc->cmd);
1048 #endif
1049 
1050 	if (!arg_len)
1051 		return -EINVAL;
1052 	ptr += arg_len; len -= arg_len;
1053 
1054 	switch(uc->cmd) {
1055 	case UC_SETSYNC:
1056 	case UC_SETTAGS:
1057 	case UC_SETWIDE:
1058 	case UC_SETFLAG:
1059 	case UC_RESETDEV:
1060 	case UC_CLEARDEV:
1061 		SKIP_SPACES(ptr, len);
1062 		if ((arg_len = is_keyword(ptr, len, "all")) != 0) {
1063 			ptr += arg_len; len -= arg_len;
1064 			uc->target = ~0;
1065 		} else {
1066 			GET_INT_ARG(ptr, len, target);
1067 			uc->target = (1<<target);
1068 #ifdef DEBUG_PROC_INFO
1069 printk("sym_user_command: target=%ld\n", target);
1070 #endif
1071 		}
1072 		break;
1073 	}
1074 
1075 	switch(uc->cmd) {
1076 	case UC_SETVERBOSE:
1077 	case UC_SETSYNC:
1078 	case UC_SETTAGS:
1079 	case UC_SETWIDE:
1080 		SKIP_SPACES(ptr, len);
1081 		GET_INT_ARG(ptr, len, uc->data);
1082 #ifdef DEBUG_PROC_INFO
1083 printk("sym_user_command: data=%ld\n", uc->data);
1084 #endif
1085 		break;
1086 #ifdef SYM_LINUX_DEBUG_CONTROL_SUPPORT
1087 	case UC_SETDEBUG:
1088 		while (len > 0) {
1089 			SKIP_SPACES(ptr, len);
1090 			if	((arg_len = is_keyword(ptr, len, "alloc")))
1091 				uc->data |= DEBUG_ALLOC;
1092 			else if	((arg_len = is_keyword(ptr, len, "phase")))
1093 				uc->data |= DEBUG_PHASE;
1094 			else if	((arg_len = is_keyword(ptr, len, "queue")))
1095 				uc->data |= DEBUG_QUEUE;
1096 			else if	((arg_len = is_keyword(ptr, len, "result")))
1097 				uc->data |= DEBUG_RESULT;
1098 			else if	((arg_len = is_keyword(ptr, len, "scatter")))
1099 				uc->data |= DEBUG_SCATTER;
1100 			else if	((arg_len = is_keyword(ptr, len, "script")))
1101 				uc->data |= DEBUG_SCRIPT;
1102 			else if	((arg_len = is_keyword(ptr, len, "tiny")))
1103 				uc->data |= DEBUG_TINY;
1104 			else if	((arg_len = is_keyword(ptr, len, "timing")))
1105 				uc->data |= DEBUG_TIMING;
1106 			else if	((arg_len = is_keyword(ptr, len, "nego")))
1107 				uc->data |= DEBUG_NEGO;
1108 			else if	((arg_len = is_keyword(ptr, len, "tags")))
1109 				uc->data |= DEBUG_TAGS;
1110 			else if	((arg_len = is_keyword(ptr, len, "pointer")))
1111 				uc->data |= DEBUG_POINTER;
1112 			else
1113 				return -EINVAL;
1114 			ptr += arg_len; len -= arg_len;
1115 		}
1116 #ifdef DEBUG_PROC_INFO
1117 printk("sym_user_command: data=%ld\n", uc->data);
1118 #endif
1119 		break;
1120 #endif /* SYM_LINUX_DEBUG_CONTROL_SUPPORT */
1121 	case UC_SETFLAG:
1122 		while (len > 0) {
1123 			SKIP_SPACES(ptr, len);
1124 			if	((arg_len = is_keyword(ptr, len, "no_disc")))
1125 				uc->data &= ~SYM_DISC_ENABLED;
1126 			else
1127 				return -EINVAL;
1128 			ptr += arg_len; len -= arg_len;
1129 		}
1130 		break;
1131 	default:
1132 		break;
1133 	}
1134 
1135 	if (len)
1136 		return -EINVAL;
1137 	else {
1138 		unsigned long flags;
1139 
1140 		spin_lock_irqsave(shost->host_lock, flags);
1141 		sym_exec_user_command(np, uc);
1142 		spin_unlock_irqrestore(shost->host_lock, flags);
1143 	}
1144 	return length;
1145 }
1146 
1147 #endif	/* SYM_LINUX_USER_COMMAND_SUPPORT */
1148 
1149 
1150 /*
1151  *  Copy formatted information into the input buffer.
1152  */
1153 static int sym_show_info(struct seq_file *m, struct Scsi_Host *shost)
1154 {
1155 #ifdef SYM_LINUX_USER_INFO_SUPPORT
1156 	struct sym_data *sym_data = shost_priv(shost);
1157 	struct pci_dev *pdev = sym_data->pdev;
1158 	struct sym_hcb *np = sym_data->ncb;
1159 
1160 	seq_printf(m, "Chip " NAME53C "%s, device id 0x%x, "
1161 		 "revision id 0x%x\n", np->s.chip_name,
1162 		 pdev->device, pdev->revision);
1163 	seq_printf(m, "At PCI address %s, IRQ %u\n",
1164 			 pci_name(pdev), pdev->irq);
1165 	seq_printf(m, "Min. period factor %d, %s SCSI BUS%s\n",
1166 		 (int) (np->minsync_dt ? np->minsync_dt : np->minsync),
1167 		 np->maxwide ? "Wide" : "Narrow",
1168 		 np->minsync_dt ? ", DT capable" : "");
1169 
1170 	seq_printf(m, "Max. started commands %d, "
1171 		 "max. commands per LUN %d\n",
1172 		 SYM_CONF_MAX_START, SYM_CONF_MAX_TAG);
1173 
1174 	return 0;
1175 #else
1176 	return -EINVAL;
1177 #endif /* SYM_LINUX_USER_INFO_SUPPORT */
1178 }
1179 
1180 #endif /* SYM_LINUX_PROC_INFO_SUPPORT */
1181 
1182 /*
1183  * Free resources claimed by sym_iomap_device().  Note that
1184  * sym_free_resources() should be used instead of this function after calling
1185  * sym_attach().
1186  */
1187 static void sym_iounmap_device(struct sym_device *device)
1188 {
1189 	if (device->s.ioaddr)
1190 		pci_iounmap(device->pdev, device->s.ioaddr);
1191 	if (device->s.ramaddr)
1192 		pci_iounmap(device->pdev, device->s.ramaddr);
1193 }
1194 
1195 /*
1196  *	Free controller resources.
1197  */
1198 static void sym_free_resources(struct sym_hcb *np, struct pci_dev *pdev,
1199 		int do_free_irq)
1200 {
1201 	/*
1202 	 *  Free O/S specific resources.
1203 	 */
1204 	if (do_free_irq)
1205 		free_irq(pdev->irq, np->s.host);
1206 	if (np->s.ioaddr)
1207 		pci_iounmap(pdev, np->s.ioaddr);
1208 	if (np->s.ramaddr)
1209 		pci_iounmap(pdev, np->s.ramaddr);
1210 	/*
1211 	 *  Free O/S independent resources.
1212 	 */
1213 	sym_hcb_free(np);
1214 
1215 	sym_mfree_dma(np, sizeof(*np), "HCB");
1216 }
1217 
1218 /*
1219  *  Host attach and initialisations.
1220  *
1221  *  Allocate host data and ncb structure.
1222  *  Remap MMIO region.
1223  *  Do chip initialization.
1224  *  If all is OK, install interrupt handling and
1225  *  start the timer daemon.
1226  */
1227 static struct Scsi_Host *sym_attach(const struct scsi_host_template *tpnt, int unit,
1228 				    struct sym_device *dev)
1229 {
1230 	struct sym_data *sym_data;
1231 	struct sym_hcb *np = NULL;
1232 	struct Scsi_Host *shost = NULL;
1233 	struct pci_dev *pdev = dev->pdev;
1234 	unsigned long flags;
1235 	struct sym_fw *fw;
1236 	int do_free_irq = 0;
1237 
1238 	printk(KERN_INFO "sym%d: <%s> rev 0x%x at pci %s irq %u\n",
1239 		unit, dev->chip.name, pdev->revision, pci_name(pdev),
1240 		pdev->irq);
1241 
1242 	/*
1243 	 *  Get the firmware for this chip.
1244 	 */
1245 	fw = sym_find_firmware(&dev->chip);
1246 	if (!fw)
1247 		goto attach_failed;
1248 
1249 	shost = scsi_host_alloc(tpnt, sizeof(*sym_data));
1250 	if (!shost)
1251 		goto attach_failed;
1252 	sym_data = shost_priv(shost);
1253 
1254 	/*
1255 	 *  Allocate immediately the host control block,
1256 	 *  since we are only expecting to succeed. :)
1257 	 *  We keep track in the HCB of all the resources that
1258 	 *  are to be released on error.
1259 	 */
1260 	np = __sym_calloc_dma(&pdev->dev, sizeof(*np), "HCB");
1261 	if (!np)
1262 		goto attach_failed;
1263 	np->bus_dmat = &pdev->dev; /* Result in 1 DMA pool per HBA */
1264 	sym_data->ncb = np;
1265 	sym_data->pdev = pdev;
1266 	np->s.host = shost;
1267 
1268 	pci_set_drvdata(pdev, shost);
1269 
1270 	/*
1271 	 *  Copy some useful infos to the HCB.
1272 	 */
1273 	np->hcb_ba	= vtobus(np);
1274 	np->verbose	= sym_driver_setup.verbose;
1275 	np->s.unit	= unit;
1276 	np->features	= dev->chip.features;
1277 	np->clock_divn	= dev->chip.nr_divisor;
1278 	np->maxoffs	= dev->chip.offset_max;
1279 	np->maxburst	= dev->chip.burst_max;
1280 	np->myaddr	= dev->host_id;
1281 	np->mmio_ba	= (u32)dev->mmio_base;
1282 	np->ram_ba	= (u32)dev->ram_base;
1283 	np->s.ioaddr	= dev->s.ioaddr;
1284 	np->s.ramaddr	= dev->s.ramaddr;
1285 
1286 	/*
1287 	 *  Edit its name.
1288 	 */
1289 	strlcpy(np->s.chip_name, dev->chip.name, sizeof(np->s.chip_name));
1290 	sprintf(np->s.inst_name, "sym%d", np->s.unit);
1291 
1292 	if ((SYM_CONF_DMA_ADDRESSING_MODE > 0) && (np->features & FE_DAC) &&
1293 			!dma_set_mask(&pdev->dev, DMA_DAC_MASK)) {
1294 		set_dac(np);
1295 	} else if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(32))) {
1296 		printf_warning("%s: No suitable DMA available\n", sym_name(np));
1297 		goto attach_failed;
1298 	}
1299 
1300 	if (sym_hcb_attach(shost, fw, dev->nvram))
1301 		goto attach_failed;
1302 
1303 	/*
1304 	 *  Install the interrupt handler.
1305 	 *  If we synchonize the C code with SCRIPTS on interrupt,
1306 	 *  we do not want to share the INTR line at all.
1307 	 */
1308 	if (request_irq(pdev->irq, sym53c8xx_intr, IRQF_SHARED, NAME53C8XX,
1309 			shost)) {
1310 		printf_err("%s: request irq %u failure\n",
1311 			sym_name(np), pdev->irq);
1312 		goto attach_failed;
1313 	}
1314 	do_free_irq = 1;
1315 
1316 	/*
1317 	 *  After SCSI devices have been opened, we cannot
1318 	 *  reset the bus safely, so we do it here.
1319 	 */
1320 	spin_lock_irqsave(shost->host_lock, flags);
1321 	if (sym_reset_scsi_bus(np, 0))
1322 		goto reset_failed;
1323 
1324 	/*
1325 	 *  Start the SCRIPTS.
1326 	 */
1327 	sym_start_up(shost, 1);
1328 
1329 	/*
1330 	 *  Start the timer daemon
1331 	 */
1332 	timer_setup(&np->s.timer, sym53c8xx_timer, 0);
1333 	np->s.lasttime=0;
1334 	sym_timer (np);
1335 
1336 	/*
1337 	 *  Fill Linux host instance structure
1338 	 *  and return success.
1339 	 */
1340 	shost->max_channel	= 0;
1341 	shost->this_id		= np->myaddr;
1342 	shost->max_id		= np->maxwide ? 16 : 8;
1343 	shost->max_lun		= SYM_CONF_MAX_LUN;
1344 	shost->unique_id	= pci_resource_start(pdev, 0);
1345 	shost->cmd_per_lun	= SYM_CONF_MAX_TAG;
1346 	shost->can_queue	= (SYM_CONF_MAX_START-2);
1347 	shost->sg_tablesize	= SYM_CONF_MAX_SG;
1348 	shost->max_cmd_len	= 16;
1349 	BUG_ON(sym2_transport_template == NULL);
1350 	shost->transportt	= sym2_transport_template;
1351 
1352 	/* 53c896 rev 1 errata: DMA may not cross 16MB boundary */
1353 	if (pdev->device == PCI_DEVICE_ID_NCR_53C896 && pdev->revision < 2)
1354 		shost->dma_boundary = 0xFFFFFF;
1355 
1356 	spin_unlock_irqrestore(shost->host_lock, flags);
1357 
1358 	return shost;
1359 
1360  reset_failed:
1361 	printf_err("%s: FATAL ERROR: CHECK SCSI BUS - CABLES, "
1362 		   "TERMINATION, DEVICE POWER etc.!\n", sym_name(np));
1363 	spin_unlock_irqrestore(shost->host_lock, flags);
1364  attach_failed:
1365 	printf_info("sym%d: giving up ...\n", unit);
1366 	if (np)
1367 		sym_free_resources(np, pdev, do_free_irq);
1368 	else
1369 		sym_iounmap_device(dev);
1370 	if (shost)
1371 		scsi_host_put(shost);
1372 
1373 	return NULL;
1374 }
1375 
1376 
1377 /*
1378  *    Detect and try to read SYMBIOS and TEKRAM NVRAM.
1379  */
1380 #if SYM_CONF_NVRAM_SUPPORT
1381 static void sym_get_nvram(struct sym_device *devp, struct sym_nvram *nvp)
1382 {
1383 	devp->nvram = nvp;
1384 	nvp->type = 0;
1385 
1386 	sym_read_nvram(devp, nvp);
1387 }
1388 #else
1389 static inline void sym_get_nvram(struct sym_device *devp, struct sym_nvram *nvp)
1390 {
1391 }
1392 #endif	/* SYM_CONF_NVRAM_SUPPORT */
1393 
1394 static int sym_check_supported(struct sym_device *device)
1395 {
1396 	struct sym_chip *chip;
1397 	struct pci_dev *pdev = device->pdev;
1398 	unsigned long io_port = pci_resource_start(pdev, 0);
1399 	int i;
1400 
1401 	/*
1402 	 *  If user excluded this chip, do not initialize it.
1403 	 *  I hate this code so much.  Must kill it.
1404 	 */
1405 	if (io_port) {
1406 		for (i = 0 ; i < 8 ; i++) {
1407 			if (sym_driver_setup.excludes[i] == io_port)
1408 				return -ENODEV;
1409 		}
1410 	}
1411 
1412 	/*
1413 	 * Check if the chip is supported.  Then copy the chip description
1414 	 * to our device structure so we can make it match the actual device
1415 	 * and options.
1416 	 */
1417 	chip = sym_lookup_chip_table(pdev->device, pdev->revision);
1418 	if (!chip) {
1419 		dev_info(&pdev->dev, "device not supported\n");
1420 		return -ENODEV;
1421 	}
1422 	memcpy(&device->chip, chip, sizeof(device->chip));
1423 
1424 	return 0;
1425 }
1426 
1427 /*
1428  * Ignore Symbios chips controlled by various RAID controllers.
1429  * These controllers set value 0x52414944 at RAM end - 16.
1430  */
1431 static int sym_check_raid(struct sym_device *device)
1432 {
1433 	unsigned int ram_size, ram_val;
1434 
1435 	if (!device->s.ramaddr)
1436 		return 0;
1437 
1438 	if (device->chip.features & FE_RAM8K)
1439 		ram_size = 8192;
1440 	else
1441 		ram_size = 4096;
1442 
1443 	ram_val = readl(device->s.ramaddr + ram_size - 16);
1444 	if (ram_val != 0x52414944)
1445 		return 0;
1446 
1447 	dev_info(&device->pdev->dev,
1448 			"not initializing, driven by RAID controller.\n");
1449 	return -ENODEV;
1450 }
1451 
1452 static int sym_set_workarounds(struct sym_device *device)
1453 {
1454 	struct sym_chip *chip = &device->chip;
1455 	struct pci_dev *pdev = device->pdev;
1456 	u_short status_reg;
1457 
1458 	/*
1459 	 *  (ITEM 12 of a DEL about the 896 I haven't yet).
1460 	 *  We must ensure the chip will use WRITE AND INVALIDATE.
1461 	 *  The revision number limit is for now arbitrary.
1462 	 */
1463 	if (pdev->device == PCI_DEVICE_ID_NCR_53C896 && pdev->revision < 0x4) {
1464 		chip->features	|= (FE_WRIE | FE_CLSE);
1465 	}
1466 
1467 	/* If the chip can do Memory Write Invalidate, enable it */
1468 	if (chip->features & FE_WRIE) {
1469 		if (pci_set_mwi(pdev))
1470 			return -ENODEV;
1471 	}
1472 
1473 	/*
1474 	 *  Work around for errant bit in 895A. The 66Mhz
1475 	 *  capable bit is set erroneously. Clear this bit.
1476 	 *  (Item 1 DEL 533)
1477 	 *
1478 	 *  Make sure Config space and Features agree.
1479 	 *
1480 	 *  Recall: writes are not normal to status register -
1481 	 *  write a 1 to clear and a 0 to leave unchanged.
1482 	 *  Can only reset bits.
1483 	 */
1484 	pci_read_config_word(pdev, PCI_STATUS, &status_reg);
1485 	if (chip->features & FE_66MHZ) {
1486 		if (!(status_reg & PCI_STATUS_66MHZ))
1487 			chip->features &= ~FE_66MHZ;
1488 	} else {
1489 		if (status_reg & PCI_STATUS_66MHZ) {
1490 			status_reg = PCI_STATUS_66MHZ;
1491 			pci_write_config_word(pdev, PCI_STATUS, status_reg);
1492 			pci_read_config_word(pdev, PCI_STATUS, &status_reg);
1493 		}
1494 	}
1495 
1496 	return 0;
1497 }
1498 
1499 /*
1500  * Map HBA registers and on-chip SRAM (if present).
1501  */
1502 static int sym_iomap_device(struct sym_device *device)
1503 {
1504 	struct pci_dev *pdev = device->pdev;
1505 	struct pci_bus_region bus_addr;
1506 	int i = 2;
1507 
1508 	pcibios_resource_to_bus(pdev->bus, &bus_addr, &pdev->resource[1]);
1509 	device->mmio_base = bus_addr.start;
1510 
1511 	if (device->chip.features & FE_RAM) {
1512 		/*
1513 		 * If the BAR is 64-bit, resource 2 will be occupied by the
1514 		 * upper 32 bits
1515 		 */
1516 		if (!pdev->resource[i].flags)
1517 			i++;
1518 		pcibios_resource_to_bus(pdev->bus, &bus_addr,
1519 					&pdev->resource[i]);
1520 		device->ram_base = bus_addr.start;
1521 	}
1522 
1523 #ifdef CONFIG_SCSI_SYM53C8XX_MMIO
1524 	if (device->mmio_base)
1525 		device->s.ioaddr = pci_iomap(pdev, 1,
1526 						pci_resource_len(pdev, 1));
1527 #endif
1528 	if (!device->s.ioaddr)
1529 		device->s.ioaddr = pci_iomap(pdev, 0,
1530 						pci_resource_len(pdev, 0));
1531 	if (!device->s.ioaddr) {
1532 		dev_err(&pdev->dev, "could not map registers; giving up.\n");
1533 		return -EIO;
1534 	}
1535 	if (device->ram_base) {
1536 		device->s.ramaddr = pci_iomap(pdev, i,
1537 						pci_resource_len(pdev, i));
1538 		if (!device->s.ramaddr) {
1539 			dev_warn(&pdev->dev,
1540 				"could not map SRAM; continuing anyway.\n");
1541 			device->ram_base = 0;
1542 		}
1543 	}
1544 
1545 	return 0;
1546 }
1547 
1548 /*
1549  * The NCR PQS and PDS cards are constructed as a DEC bridge
1550  * behind which sits a proprietary NCR memory controller and
1551  * either four or two 53c875s as separate devices.  We can tell
1552  * if an 875 is part of a PQS/PDS or not since if it is, it will
1553  * be on the same bus as the memory controller.  In its usual
1554  * mode of operation, the 875s are slaved to the memory
1555  * controller for all transfers.  To operate with the Linux
1556  * driver, the memory controller is disabled and the 875s
1557  * freed to function independently.  The only wrinkle is that
1558  * the preset SCSI ID (which may be zero) must be read in from
1559  * a special configuration space register of the 875.
1560  */
1561 static void sym_config_pqs(struct pci_dev *pdev, struct sym_device *sym_dev)
1562 {
1563 	int slot;
1564 	u8 tmp;
1565 
1566 	for (slot = 0; slot < 256; slot++) {
1567 		struct pci_dev *memc = pci_get_slot(pdev->bus, slot);
1568 
1569 		if (!memc || memc->vendor != 0x101a || memc->device == 0x0009) {
1570 			pci_dev_put(memc);
1571 			continue;
1572 		}
1573 
1574 		/* bit 1: allow individual 875 configuration */
1575 		pci_read_config_byte(memc, 0x44, &tmp);
1576 		if ((tmp & 0x2) == 0) {
1577 			tmp |= 0x2;
1578 			pci_write_config_byte(memc, 0x44, tmp);
1579 		}
1580 
1581 		/* bit 2: drive individual 875 interrupts to the bus */
1582 		pci_read_config_byte(memc, 0x45, &tmp);
1583 		if ((tmp & 0x4) == 0) {
1584 			tmp |= 0x4;
1585 			pci_write_config_byte(memc, 0x45, tmp);
1586 		}
1587 
1588 		pci_dev_put(memc);
1589 		break;
1590 	}
1591 
1592 	pci_read_config_byte(pdev, 0x84, &tmp);
1593 	sym_dev->host_id = tmp;
1594 }
1595 
1596 /*
1597  *  Called before unloading the module.
1598  *  Detach the host.
1599  *  We have to free resources and halt the NCR chip.
1600  */
1601 static int sym_detach(struct Scsi_Host *shost, struct pci_dev *pdev)
1602 {
1603 	struct sym_hcb *np = sym_get_hcb(shost);
1604 	printk("%s: detaching ...\n", sym_name(np));
1605 
1606 	del_timer_sync(&np->s.timer);
1607 
1608 	/*
1609 	 * Reset NCR chip.
1610 	 * We should use sym_soft_reset(), but we don't want to do
1611 	 * so, since we may not be safe if interrupts occur.
1612 	 */
1613 	printk("%s: resetting chip\n", sym_name(np));
1614 	OUTB(np, nc_istat, SRST);
1615 	INB(np, nc_mbox1);
1616 	udelay(10);
1617 	OUTB(np, nc_istat, 0);
1618 
1619 	sym_free_resources(np, pdev, 1);
1620 	scsi_host_put(shost);
1621 
1622 	return 1;
1623 }
1624 
1625 /*
1626  * Driver host template.
1627  */
1628 static const struct scsi_host_template sym2_template = {
1629 	.module			= THIS_MODULE,
1630 	.name			= "sym53c8xx",
1631 	.info			= sym53c8xx_info,
1632 	.cmd_size		= sizeof(struct sym_ucmd),
1633 	.queuecommand		= sym53c8xx_queue_command,
1634 	.slave_alloc		= sym53c8xx_slave_alloc,
1635 	.slave_configure	= sym53c8xx_slave_configure,
1636 	.slave_destroy		= sym53c8xx_slave_destroy,
1637 	.eh_abort_handler	= sym53c8xx_eh_abort_handler,
1638 	.eh_device_reset_handler = sym53c8xx_eh_device_reset_handler,
1639 	.eh_bus_reset_handler	= sym53c8xx_eh_bus_reset_handler,
1640 	.eh_host_reset_handler	= sym53c8xx_eh_host_reset_handler,
1641 	.this_id		= 7,
1642 	.max_sectors		= 0xFFFF,
1643 #ifdef SYM_LINUX_PROC_INFO_SUPPORT
1644 	.show_info		= sym_show_info,
1645 #ifdef	SYM_LINUX_USER_COMMAND_SUPPORT
1646 	.write_info		= sym_user_command,
1647 #endif
1648 	.proc_name		= NAME53C8XX,
1649 #endif
1650 };
1651 
1652 static int attach_count;
1653 
1654 static int sym2_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
1655 {
1656 	struct sym_device sym_dev;
1657 	struct sym_nvram nvram;
1658 	struct Scsi_Host *shost;
1659 	int do_iounmap = 0;
1660 	int do_disable_device = 1;
1661 
1662 	memset(&sym_dev, 0, sizeof(sym_dev));
1663 	memset(&nvram, 0, sizeof(nvram));
1664 	sym_dev.pdev = pdev;
1665 	sym_dev.host_id = SYM_SETUP_HOST_ID;
1666 
1667 	if (pci_enable_device(pdev))
1668 		goto leave;
1669 
1670 	pci_set_master(pdev);
1671 
1672 	if (pci_request_regions(pdev, NAME53C8XX))
1673 		goto disable;
1674 
1675 	if (sym_check_supported(&sym_dev))
1676 		goto free;
1677 
1678 	if (sym_iomap_device(&sym_dev))
1679 		goto free;
1680 	do_iounmap = 1;
1681 
1682 	if (sym_check_raid(&sym_dev)) {
1683 		do_disable_device = 0;	/* Don't disable the device */
1684 		goto free;
1685 	}
1686 
1687 	if (sym_set_workarounds(&sym_dev))
1688 		goto free;
1689 
1690 	sym_config_pqs(pdev, &sym_dev);
1691 
1692 	sym_get_nvram(&sym_dev, &nvram);
1693 
1694 	do_iounmap = 0; /* Don't sym_iounmap_device() after sym_attach(). */
1695 	shost = sym_attach(&sym2_template, attach_count, &sym_dev);
1696 	if (!shost)
1697 		goto free;
1698 
1699 	if (scsi_add_host(shost, &pdev->dev))
1700 		goto detach;
1701 	scsi_scan_host(shost);
1702 
1703 	attach_count++;
1704 
1705 	return 0;
1706 
1707  detach:
1708 	sym_detach(pci_get_drvdata(pdev), pdev);
1709  free:
1710 	if (do_iounmap)
1711 		sym_iounmap_device(&sym_dev);
1712 	pci_release_regions(pdev);
1713  disable:
1714 	if (do_disable_device)
1715 		pci_disable_device(pdev);
1716  leave:
1717 	return -ENODEV;
1718 }
1719 
1720 static void sym2_remove(struct pci_dev *pdev)
1721 {
1722 	struct Scsi_Host *shost = pci_get_drvdata(pdev);
1723 
1724 	scsi_remove_host(shost);
1725 	sym_detach(shost, pdev);
1726 	pci_release_regions(pdev);
1727 	pci_disable_device(pdev);
1728 
1729 	attach_count--;
1730 }
1731 
1732 /**
1733  * sym2_io_error_detected() - called when PCI error is detected
1734  * @pdev: pointer to PCI device
1735  * @state: current state of the PCI slot
1736  */
1737 static pci_ers_result_t sym2_io_error_detected(struct pci_dev *pdev,
1738                                          pci_channel_state_t state)
1739 {
1740 	/* If slot is permanently frozen, turn everything off */
1741 	if (state == pci_channel_io_perm_failure) {
1742 		sym2_remove(pdev);
1743 		return PCI_ERS_RESULT_DISCONNECT;
1744 	}
1745 
1746 	disable_irq(pdev->irq);
1747 	pci_disable_device(pdev);
1748 
1749 	/* Request that MMIO be enabled, so register dump can be taken. */
1750 	return PCI_ERS_RESULT_CAN_RECOVER;
1751 }
1752 
1753 /**
1754  * sym2_io_slot_dump - Enable MMIO and dump debug registers
1755  * @pdev: pointer to PCI device
1756  */
1757 static pci_ers_result_t sym2_io_slot_dump(struct pci_dev *pdev)
1758 {
1759 	struct Scsi_Host *shost = pci_get_drvdata(pdev);
1760 
1761 	sym_dump_registers(shost);
1762 
1763 	/* Request a slot reset. */
1764 	return PCI_ERS_RESULT_NEED_RESET;
1765 }
1766 
1767 /**
1768  * sym2_reset_workarounds - hardware-specific work-arounds
1769  * @pdev: pointer to PCI device
1770  *
1771  * This routine is similar to sym_set_workarounds(), except
1772  * that, at this point, we already know that the device was
1773  * successfully initialized at least once before, and so most
1774  * of the steps taken there are un-needed here.
1775  */
1776 static void sym2_reset_workarounds(struct pci_dev *pdev)
1777 {
1778 	u_short status_reg;
1779 	struct sym_chip *chip;
1780 
1781 	chip = sym_lookup_chip_table(pdev->device, pdev->revision);
1782 
1783 	/* Work around for errant bit in 895A, in a fashion
1784 	 * similar to what is done in sym_set_workarounds().
1785 	 */
1786 	pci_read_config_word(pdev, PCI_STATUS, &status_reg);
1787 	if (!(chip->features & FE_66MHZ) && (status_reg & PCI_STATUS_66MHZ)) {
1788 		status_reg = PCI_STATUS_66MHZ;
1789 		pci_write_config_word(pdev, PCI_STATUS, status_reg);
1790 		pci_read_config_word(pdev, PCI_STATUS, &status_reg);
1791 	}
1792 }
1793 
1794 /**
1795  * sym2_io_slot_reset() - called when the pci bus has been reset.
1796  * @pdev: pointer to PCI device
1797  *
1798  * Restart the card from scratch.
1799  */
1800 static pci_ers_result_t sym2_io_slot_reset(struct pci_dev *pdev)
1801 {
1802 	struct Scsi_Host *shost = pci_get_drvdata(pdev);
1803 	struct sym_hcb *np = sym_get_hcb(shost);
1804 
1805 	printk(KERN_INFO "%s: recovering from a PCI slot reset\n",
1806 	          sym_name(np));
1807 
1808 	if (pci_enable_device(pdev)) {
1809 		printk(KERN_ERR "%s: Unable to enable after PCI reset\n",
1810 		        sym_name(np));
1811 		return PCI_ERS_RESULT_DISCONNECT;
1812 	}
1813 
1814 	pci_set_master(pdev);
1815 	enable_irq(pdev->irq);
1816 
1817 	/* If the chip can do Memory Write Invalidate, enable it */
1818 	if (np->features & FE_WRIE) {
1819 		if (pci_set_mwi(pdev))
1820 			return PCI_ERS_RESULT_DISCONNECT;
1821 	}
1822 
1823 	/* Perform work-arounds, analogous to sym_set_workarounds() */
1824 	sym2_reset_workarounds(pdev);
1825 
1826 	/* Perform host reset only on one instance of the card */
1827 	if (PCI_FUNC(pdev->devfn) == 0) {
1828 		if (sym_reset_scsi_bus(np, 0)) {
1829 			printk(KERN_ERR "%s: Unable to reset scsi host\n",
1830 			        sym_name(np));
1831 			return PCI_ERS_RESULT_DISCONNECT;
1832 		}
1833 		sym_start_up(shost, 1);
1834 	}
1835 
1836 	return PCI_ERS_RESULT_RECOVERED;
1837 }
1838 
1839 /**
1840  * sym2_io_resume() - resume normal ops after PCI reset
1841  * @pdev: pointer to PCI device
1842  *
1843  * Called when the error recovery driver tells us that its
1844  * OK to resume normal operation. Use completion to allow
1845  * halted scsi ops to resume.
1846  */
1847 static void sym2_io_resume(struct pci_dev *pdev)
1848 {
1849 	struct Scsi_Host *shost = pci_get_drvdata(pdev);
1850 	struct sym_data *sym_data = shost_priv(shost);
1851 
1852 	spin_lock_irq(shost->host_lock);
1853 	if (sym_data->io_reset)
1854 		complete(sym_data->io_reset);
1855 	spin_unlock_irq(shost->host_lock);
1856 }
1857 
1858 static void sym2_get_signalling(struct Scsi_Host *shost)
1859 {
1860 	struct sym_hcb *np = sym_get_hcb(shost);
1861 	enum spi_signal_type type;
1862 
1863 	switch (np->scsi_mode) {
1864 	case SMODE_SE:
1865 		type = SPI_SIGNAL_SE;
1866 		break;
1867 	case SMODE_LVD:
1868 		type = SPI_SIGNAL_LVD;
1869 		break;
1870 	case SMODE_HVD:
1871 		type = SPI_SIGNAL_HVD;
1872 		break;
1873 	default:
1874 		type = SPI_SIGNAL_UNKNOWN;
1875 		break;
1876 	}
1877 	spi_signalling(shost) = type;
1878 }
1879 
1880 static void sym2_set_offset(struct scsi_target *starget, int offset)
1881 {
1882 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1883 	struct sym_hcb *np = sym_get_hcb(shost);
1884 	struct sym_tcb *tp = &np->target[starget->id];
1885 
1886 	tp->tgoal.offset = offset;
1887 	tp->tgoal.check_nego = 1;
1888 }
1889 
1890 static void sym2_set_period(struct scsi_target *starget, int period)
1891 {
1892 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1893 	struct sym_hcb *np = sym_get_hcb(shost);
1894 	struct sym_tcb *tp = &np->target[starget->id];
1895 
1896 	/* have to have DT for these transfers, but DT will also
1897 	 * set width, so check that this is allowed */
1898 	if (period <= np->minsync && spi_width(starget))
1899 		tp->tgoal.dt = 1;
1900 
1901 	tp->tgoal.period = period;
1902 	tp->tgoal.check_nego = 1;
1903 }
1904 
1905 static void sym2_set_width(struct scsi_target *starget, int width)
1906 {
1907 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1908 	struct sym_hcb *np = sym_get_hcb(shost);
1909 	struct sym_tcb *tp = &np->target[starget->id];
1910 
1911 	/* It is illegal to have DT set on narrow transfers.  If DT is
1912 	 * clear, we must also clear IU and QAS.  */
1913 	if (width == 0)
1914 		tp->tgoal.iu = tp->tgoal.dt = tp->tgoal.qas = 0;
1915 
1916 	tp->tgoal.width = width;
1917 	tp->tgoal.check_nego = 1;
1918 }
1919 
1920 static void sym2_set_dt(struct scsi_target *starget, int dt)
1921 {
1922 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1923 	struct sym_hcb *np = sym_get_hcb(shost);
1924 	struct sym_tcb *tp = &np->target[starget->id];
1925 
1926 	/* We must clear QAS and IU if DT is clear */
1927 	if (dt)
1928 		tp->tgoal.dt = 1;
1929 	else
1930 		tp->tgoal.iu = tp->tgoal.dt = tp->tgoal.qas = 0;
1931 	tp->tgoal.check_nego = 1;
1932 }
1933 
1934 #if 0
1935 static void sym2_set_iu(struct scsi_target *starget, int iu)
1936 {
1937 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1938 	struct sym_hcb *np = sym_get_hcb(shost);
1939 	struct sym_tcb *tp = &np->target[starget->id];
1940 
1941 	if (iu)
1942 		tp->tgoal.iu = tp->tgoal.dt = 1;
1943 	else
1944 		tp->tgoal.iu = 0;
1945 	tp->tgoal.check_nego = 1;
1946 }
1947 
1948 static void sym2_set_qas(struct scsi_target *starget, int qas)
1949 {
1950 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1951 	struct sym_hcb *np = sym_get_hcb(shost);
1952 	struct sym_tcb *tp = &np->target[starget->id];
1953 
1954 	if (qas)
1955 		tp->tgoal.dt = tp->tgoal.qas = 1;
1956 	else
1957 		tp->tgoal.qas = 0;
1958 	tp->tgoal.check_nego = 1;
1959 }
1960 #endif
1961 
1962 static struct spi_function_template sym2_transport_functions = {
1963 	.set_offset	= sym2_set_offset,
1964 	.show_offset	= 1,
1965 	.set_period	= sym2_set_period,
1966 	.show_period	= 1,
1967 	.set_width	= sym2_set_width,
1968 	.show_width	= 1,
1969 	.set_dt		= sym2_set_dt,
1970 	.show_dt	= 1,
1971 #if 0
1972 	.set_iu		= sym2_set_iu,
1973 	.show_iu	= 1,
1974 	.set_qas	= sym2_set_qas,
1975 	.show_qas	= 1,
1976 #endif
1977 	.get_signalling	= sym2_get_signalling,
1978 };
1979 
1980 static struct pci_device_id sym2_id_table[] = {
1981 	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C810,
1982 	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
1983 	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C820,
1984 	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, /* new */
1985 	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C825,
1986 	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
1987 	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C815,
1988 	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
1989 	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C810AP,
1990 	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, /* new */
1991 	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C860,
1992 	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
1993 	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C1510,
1994 	  PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_SCSI<<8,  0xffff00, 0UL },
1995 	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C896,
1996 	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
1997 	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C895,
1998 	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
1999 	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C885,
2000 	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2001 	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C875,
2002 	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2003 	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C1510,
2004 	  PCI_ANY_ID, PCI_ANY_ID,  PCI_CLASS_STORAGE_SCSI<<8,  0xffff00, 0UL }, /* new */
2005 	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C895A,
2006 	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2007 	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C875A,
2008 	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2009 	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C1010_33,
2010 	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2011 	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C1010_66,
2012 	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2013 	{ PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C875J,
2014 	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2015 	{ 0, }
2016 };
2017 
2018 MODULE_DEVICE_TABLE(pci, sym2_id_table);
2019 
2020 static const struct pci_error_handlers sym2_err_handler = {
2021 	.error_detected	= sym2_io_error_detected,
2022 	.mmio_enabled	= sym2_io_slot_dump,
2023 	.slot_reset	= sym2_io_slot_reset,
2024 	.resume		= sym2_io_resume,
2025 };
2026 
2027 static struct pci_driver sym2_driver = {
2028 	.name		= NAME53C8XX,
2029 	.id_table	= sym2_id_table,
2030 	.probe		= sym2_probe,
2031 	.remove		= sym2_remove,
2032 	.err_handler 	= &sym2_err_handler,
2033 };
2034 
2035 static int __init sym2_init(void)
2036 {
2037 	int error;
2038 
2039 	sym2_setup_params();
2040 	sym2_transport_template = spi_attach_transport(&sym2_transport_functions);
2041 	if (!sym2_transport_template)
2042 		return -ENODEV;
2043 
2044 	error = pci_register_driver(&sym2_driver);
2045 	if (error)
2046 		spi_release_transport(sym2_transport_template);
2047 	return error;
2048 }
2049 
2050 static void __exit sym2_exit(void)
2051 {
2052 	pci_unregister_driver(&sym2_driver);
2053 	spi_release_transport(sym2_transport_template);
2054 }
2055 
2056 module_init(sym2_init);
2057 module_exit(sym2_exit);
2058