1
2	/*
3	* Adaptec AIC7xxx device driver for Linux.
4	*
5	* $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $
6	*
7	* Copyright (c) 1994 John Aycock
8	* The University of Calgary Department of Computer Science.
9	*
10	* This program is free software; you can redistribute it and/or modify
11	* it under the terms of the GNU General Public License as published by
12	* the Free Software Foundation; either version 2, or (at your option)
13	* any later version.
14	*
15	* This program is distributed in the hope that it will be useful,
16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18	* GNU General Public License for more details.
19	*
20	* You should have received a copy of the GNU General Public License
21	* along with this program; see the file COPYING. If not, write to
22	* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
23	*
24	* Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
25	* driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
26	* config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
27	* the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
28	* the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
29	* (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
30	* the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
31	* ANSI SCSI-2 specification (draft 10c), ...
32	*
33	* --------------------------------------------------------------------------
34	*
35	* Modifications by Daniel M. Eischen (deischen@iworks.InterWorks.org):
36	*
37	* Substantially modified to include support for wide and twin bus
38	* adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes,
39	* SCB paging, and other rework of the code.
40	*
41	* --------------------------------------------------------------------------
42	* Copyright (c) 1994-2000 Justin T. Gibbs.
43	* Copyright (c) 2000-2001 Adaptec Inc.
44	* All rights reserved.
45	*
46	* Redistribution and use in source and binary forms, with or without
47	* modification, are permitted provided that the following conditions
48	* are met:
49	* 1. Redistributions of source code must retain the above copyright
50	* notice, this list of conditions, and the following disclaimer,
51	* without modification.
52	* 2. Redistributions in binary form must reproduce at minimum a disclaimer
53	* substantially similar to the "NO WARRANTY" disclaimer below
54	* ("Disclaimer") and any redistribution must be conditioned upon
55	* including a substantially similar Disclaimer requirement for further
56	* binary redistribution.
57	* 3. Neither the names of the above-listed copyright holders nor the names
58	* of any contributors may be used to endorse or promote products derived
59	* from this software without specific prior written permission.
60	*
61	* Alternatively, this software may be distributed under the terms of the
62	* GNU General Public License ("GPL") version 2 as published by the Free
63	* Software Foundation.
64	*
65	* NO WARRANTY
66	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
67	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
68	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
69	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
70	* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
71	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
72	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
73	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
74	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
75	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
76	* POSSIBILITY OF SUCH DAMAGES.
77	*
78	*---------------------------------------------------------------------------
79	*
80	* Thanks also go to (in alphabetical order) the following:
81	*
82	* Rory Bolt - Sequencer bug fixes
83	* Jay Estabrook - Initial DEC Alpha support
84	* Doug Ledford - Much needed abort/reset bug fixes
85	* Kai Makisara - DMAing of SCBs
86	*
87	* A Boot time option was also added for not resetting the scsi bus.
88	*
89	* Form: aic7xxx=extended
90	* aic7xxx=no_reset
91	* aic7xxx=verbose
92	*
93	* Daniel M. Eischen, deischen@iworks.InterWorks.org, 1/23/97
94	*
95	* Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp
96	*/
97
98	/*
99	* Further driver modifications made by Doug Ledford <dledford@redhat.com>
100	*
101	* Copyright (c) 1997-1999 Doug Ledford
102	*
103	* These changes are released under the same licensing terms as the FreeBSD
104	* driver written by Justin Gibbs. Please see his Copyright notice above
105	* for the exact terms and conditions covering my changes as well as the
106	* warranty statement.
107	*
108	* Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include
109	* but are not limited to:
110	*
111	* 1: Import of the latest FreeBSD sequencer code for this driver
112	* 2: Modification of kernel code to accommodate different sequencer semantics
113	* 3: Extensive changes throughout kernel portion of driver to improve
114	* abort/reset processing and error hanndling
115	* 4: Other work contributed by various people on the Internet
116	* 5: Changes to printk information and verbosity selection code
117	* 6: General reliability related changes, especially in IRQ management
118	* 7: Modifications to the default probe/attach order for supported cards
119	* 8: SMP friendliness has been improved
120	*
121	*/
122
123	#include "aic7xxx_osm.h"
124	#include "aic7xxx_inline.h"
125	#include <scsi/scsicam.h>
126
127	static struct scsi_transport_template *ahc_linux_transport_template = NULL;
128
129	#include <linux/init.h> /* __setup */
130	#include <linux/mm.h> /* For fetching system memory size */
131	#include <linux/blkdev.h> /* For block_size() */
132	#include <linux/delay.h> /* For ssleep/msleep */
133	#include <linux/slab.h>
134
135
136	/*
137	* Set this to the delay in seconds after SCSI bus reset.
138	* Note, we honor this only for the initial bus reset.
139	* The scsi error recovery code performs its own bus settle
140	* delay handling for error recovery actions.
141	*/
142	#ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
143	#define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
144	#else
145	#define AIC7XXX_RESET_DELAY 5000
146	#endif
147
148	/*
149	* To change the default number of tagged transactions allowed per-device,
150	* add a line to the lilo.conf file like:
151	* append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
152	* which will result in the first four devices on the first two
153	* controllers being set to a tagged queue depth of 32.
154	*
155	* The tag_commands is an array of 16 to allow for wide and twin adapters.
156	* Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
157	* for channel 1.
158	*/
159	typedef struct {
160	uint8_t tag_commands[16]; /* Allow for wide/twin adapters. */
161	} adapter_tag_info_t;
162
163	/*
164	* Modify this as you see fit for your system.
165	*
166	* 0 tagged queuing disabled
167	* 1 <= n <= 253 n == max tags ever dispatched.
168	*
169	* The driver will throttle the number of commands dispatched to a
170	* device if it returns queue full. For devices with a fixed maximum
171	* queue depth, the driver will eventually determine this depth and
172	* lock it in (a console message is printed to indicate that a lock
173	* has occurred). On some devices, queue full is returned for a temporary
174	* resource shortage. These devices will return queue full at varying
175	* depths. The driver will throttle back when the queue fulls occur and
176	* attempt to slowly increase the depth over time as the device recovers
177	* from the resource shortage.
178	*
179	* In this example, the first line will disable tagged queueing for all
180	* the devices on the first probed aic7xxx adapter.
181	*
182	* The second line enables tagged queueing with 4 commands/LUN for IDs
183	* (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
184	* driver to attempt to use up to 64 tags for ID 1.
185	*
186	* The third line is the same as the first line.
187	*
188	* The fourth line disables tagged queueing for devices 0 and 3. It
189	* enables tagged queueing for the other IDs, with 16 commands/LUN
190	* for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
191	* IDs 2, 5-7, and 9-15.
192	*/
193
194	/*
195	* NOTE: The below structure is for reference only, the actual structure
196	* to modify in order to change things is just below this comment block.
197	adapter_tag_info_t aic7xxx_tag_info[] =
198	{
199	{{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
200	{{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
201	{{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
202	{{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
203	};
204	*/
205
206	#ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
207	#define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
208	#else
209	#define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
210	#endif
211
212	#define AIC7XXX_CONFIGED_TAG_COMMANDS { \
213	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
214	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
215	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
216	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
217	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
218	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
219	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \
220	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE \
221	}
222
223	/*
224	* By default, use the number of commands specified by
225	* the users kernel configuration.
226	*/
227	static adapter_tag_info_t aic7xxx_tag_info[] =
228	{
229	{AIC7XXX_CONFIGED_TAG_COMMANDS},
230	{AIC7XXX_CONFIGED_TAG_COMMANDS},
231	{AIC7XXX_CONFIGED_TAG_COMMANDS},
232	{AIC7XXX_CONFIGED_TAG_COMMANDS},
233	{AIC7XXX_CONFIGED_TAG_COMMANDS},
234	{AIC7XXX_CONFIGED_TAG_COMMANDS},
235	{AIC7XXX_CONFIGED_TAG_COMMANDS},
236	{AIC7XXX_CONFIGED_TAG_COMMANDS},
237	{AIC7XXX_CONFIGED_TAG_COMMANDS},
238	{AIC7XXX_CONFIGED_TAG_COMMANDS},
239	{AIC7XXX_CONFIGED_TAG_COMMANDS},
240	{AIC7XXX_CONFIGED_TAG_COMMANDS},
241	{AIC7XXX_CONFIGED_TAG_COMMANDS},
242	{AIC7XXX_CONFIGED_TAG_COMMANDS},
243	{AIC7XXX_CONFIGED_TAG_COMMANDS},
244	{AIC7XXX_CONFIGED_TAG_COMMANDS}
245	};
246
247	/*
248	* There should be a specific return value for this in scsi.h, but
249	* it seems that most drivers ignore it.
250	*/
251	#define DID_UNDERFLOW DID_ERROR
252
253	void
254	ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
255	{
256	printk("(scsi%d:%c:%d:%d): ",
257	ahc->platform_data->host->host_no,
258	scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
259	scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
260	scb != NULL ? SCB_GET_LUN(scb) : -1);
261	}
262
263	/*
264	* XXX - these options apply unilaterally to _all_ 274x/284x/294x
265	* cards in the system. This should be fixed. Exceptions to this
266	* rule are noted in the comments.
267	*/
268
269	/*
270	* Skip the scsi bus reset. Non 0 make us skip the reset at startup. This
271	* has no effect on any later resets that might occur due to things like
272	* SCSI bus timeouts.
273	*/
274	static uint32_t aic7xxx_no_reset;
275
276	/*
277	* Should we force EXTENDED translation on a controller.
278	* 0 == Use whatever is in the SEEPROM or default to off
279	* 1 == Use whatever is in the SEEPROM or default to on
280	*/
281	static uint32_t aic7xxx_extended;
282
283	/*
284	* PCI bus parity checking of the Adaptec controllers. This is somewhat
285	* dubious at best. To my knowledge, this option has never actually
286	* solved a PCI parity problem, but on certain machines with broken PCI
287	* chipset configurations where stray PCI transactions with bad parity are
288	* the norm rather than the exception, the error messages can be overwhelming.
289	* It's included in the driver for completeness.
290	* 0 = Shut off PCI parity check
291	* non-0 = reverse polarity pci parity checking
292	*/
293	static uint32_t aic7xxx_pci_parity = ~0;
294
295	/*
296	* There are lots of broken chipsets in the world. Some of them will
297	* violate the PCI spec when we issue byte sized memory writes to our
298	* controller. I/O mapped register access, if allowed by the given
299	* platform, will work in almost all cases.
300	*/
301	uint32_t aic7xxx_allow_memio = ~0;
302
303	/*
304	* So that we can set how long each device is given as a selection timeout.
305	* The table of values goes like this:
306	* 0 - 256ms
307	* 1 - 128ms
308	* 2 - 64ms
309	* 3 - 32ms
310	* We default to 256ms because some older devices need a longer time
311	* to respond to initial selection.
312	*/
313	static uint32_t aic7xxx_seltime;
314
315	/*
316	* Certain devices do not perform any aging on commands. Should the
317	* device be saturated by commands in one portion of the disk, it is
318	* possible for transactions on far away sectors to never be serviced.
319	* To handle these devices, we can periodically send an ordered tag to
320	* force all outstanding transactions to be serviced prior to a new
321	* transaction.
322	*/
323	static uint32_t aic7xxx_periodic_otag;
324
325	/*
326	* Module information and settable options.
327	*/
328	static char *aic7xxx = NULL;
329
330	MODULE_AUTHOR("Maintainer: Hannes Reinecke <hare@suse.de>");
331	MODULE_DESCRIPTION("Adaptec AIC77XX/78XX SCSI Host Bus Adapter driver");
332	MODULE_LICENSE("Dual BSD/GPL");
333	MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
334	module_param(aic7xxx, charp, 0444);
335	MODULE_PARM_DESC(aic7xxx,
336	"period-delimited options string:\n"
337	" verbose Enable verbose/diagnostic logging\n"
338	" allow_memio Allow device registers to be memory mapped\n"
339	" debug Bitmask of debug values to enable\n"
340	" no_probe Toggle EISA/VLB controller probing\n"
341	" probe_eisa_vl Toggle EISA/VLB controller probing\n"
342	" no_reset Suppress initial bus resets\n"
343	" extended Enable extended geometry on all controllers\n"
344	" periodic_otag Send an ordered tagged transaction\n"
345	" periodically to prevent tag starvation.\n"
346	" This may be required by some older disk\n"
347	" drives or RAID arrays.\n"
348	" tag_info:<tag_str> Set per-target tag depth\n"
349	" global_tag_depth:<int> Global tag depth for every target\n"
350	" on every bus\n"
351	" seltime:<int> Selection Timeout\n"
352	" (0/256ms,1/128ms,2/64ms,3/32ms)\n"
353	"\n"
354	" Sample modprobe configuration file:\n"
355	" # Toggle EISA/VLB probing\n"
356	" # Set tag depth on Controller 1/Target 1 to 10 tags\n"
357	" # Shorten the selection timeout to 128ms\n"
358	"\n"
359	" options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
360	);
361
362	static void ahc_linux_handle_scsi_status(struct ahc_softc *,
363	struct scsi_device *,
364	struct scb *);
365	static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
366	struct scsi_cmnd *cmd);
367	static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
368	static void ahc_linux_release_simq(struct ahc_softc *ahc);
369	static int ahc_linux_queue_recovery_cmd(struct scsi_device *sdev,
370	struct scsi_cmnd *cmd);
371	static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
372	static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
373	struct ahc_devinfo *devinfo);
374	static void ahc_linux_device_queue_depth(struct scsi_device *);
375	static int ahc_linux_run_command(struct ahc_softc*,
376	struct ahc_linux_device *,
377	struct scsi_cmnd *);
378	static void ahc_linux_setup_tag_info_global(char *p);
379	static int aic7xxx_setup(char *s);
380
381	static int ahc_linux_unit;
382
383
384	/************************** OS Utility Wrappers *******************************/
385	void
386	ahc_delay(long usec)
387	{
388	/*
389	* udelay on Linux can have problems for
390	* multi-millisecond waits. Wait at most
391	* 1024us per call.
392	*/
393	while (usec > 0) {
394	udelay(usec % 1024);
395	usec -= 1024;
396	}
397	}
398
399	/***************************** Low Level I/O **********************************/
400	uint8_t
401	ahc_inb(struct ahc_softc * ahc, long port)
402	{
403	uint8_t x;
404
405	if (ahc->tag == BUS_SPACE_MEMIO) {
406	x = readb(addr: ahc->bsh.maddr + port);
407	} else {
408	x = inb(port: ahc->bsh.ioport + port);
409	}
410	mb();
411	return (x);
412	}
413
414	void
415	ahc_outb(struct ahc_softc * ahc, long port, uint8_t val)
416	{
417	if (ahc->tag == BUS_SPACE_MEMIO) {
418	writeb(val, addr: ahc->bsh.maddr + port);
419	} else {
420	outb(value: val, port: ahc->bsh.ioport + port);
421	}
422	mb();
423	}
424
425	void
426	ahc_outsb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
427	{
428	int i;
429
430	/*
431	* There is probably a more efficient way to do this on Linux
432	* but we don't use this for anything speed critical and this
433	* should work.
434	*/
435	for (i = 0; i < count; i++)
436	ahc_outb(ahc, port, val: *array++);
437	}
438
439	void
440	ahc_insb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
441	{
442	int i;
443
444	/*
445	* There is probably a more efficient way to do this on Linux
446	* but we don't use this for anything speed critical and this
447	* should work.
448	*/
449	for (i = 0; i < count; i++)
450	*array++ = ahc_inb(ahc, port);
451	}
452
453	/********************************* Inlines ************************************/
454	static void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
455
456	static int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
457	struct ahc_dma_seg *sg,
458	dma_addr_t addr, bus_size_t len);
459
460	static void
461	ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
462	{
463	struct scsi_cmnd *cmd;
464
465	cmd = scb->io_ctx;
466	ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
467
468	scsi_dma_unmap(cmd);
469	}
470
471	static int
472	ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
473	struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
474	{
475	int consumed;
476
477	if ((scb->sg_count + 1) > AHC_NSEG)
478	panic(fmt: "Too few segs for dma mapping. "
479	"Increase AHC_NSEG\n");
480
481	consumed = 1;
482	sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
483	scb->platform_data->xfer_len += len;
484
485	if (sizeof(dma_addr_t) > 4
486	&& (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
487	len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
488
489	sg->len = ahc_htole32(len);
490	return (consumed);
491	}
492
493	/*
494	* Return a string describing the driver.
495	*/
496	static const char *
497	ahc_linux_info(struct Scsi_Host *host)
498	{
499	static char buffer[512];
500	char ahc_info[256];
501	char *bp;
502	struct ahc_softc *ahc;
503
504	bp = &buffer[0];
505	ahc = *(struct ahc_softc **)host->hostdata;
506	memset(bp, 0, sizeof(buffer));
507	strcpy(p: bp, q: "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev " AIC7XXX_DRIVER_VERSION "\n"
508	" <");
509	strcat(p: bp, q: ahc->description);
510	strcat(p: bp, q: ">\n"
511	" ");
512	ahc_controller_info(ahc, buf: ahc_info);
513	strcat(p: bp, q: ahc_info);
514	strcat(p: bp, q: "\n");
515
516	return (bp);
517	}
518
519	/*
520	* Queue an SCB to the controller.
521	*/
522	static int ahc_linux_queue_lck(struct scsi_cmnd *cmd)
523	{
524	struct ahc_softc *ahc;
525	struct ahc_linux_device *dev = scsi_transport_device_data(sdev: cmd->device);
526	int rtn = SCSI_MLQUEUE_HOST_BUSY;
527	unsigned long flags;
528
529	ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
530
531	ahc_lock(ahc, flags: &flags);
532	if (ahc->platform_data->qfrozen == 0) {
533	cmd->result = CAM_REQ_INPROG << 16;
534	rtn = ahc_linux_run_command(ahc, dev, cmd);
535	}
536	ahc_unlock(ahc, flags: &flags);
537
538	return rtn;
539	}
540
541	static DEF_SCSI_QCMD(ahc_linux_queue)
542
543	static inline struct scsi_target **
544	ahc_linux_target_in_softc(struct scsi_target *starget)
545	{
546	struct ahc_softc *ahc =
547	*((struct ahc_softc **)dev_to_shost(dev: &starget->dev)->hostdata);
548	unsigned int target_offset;
549
550	target_offset = starget->id;
551	if (starget->channel != 0)
552	target_offset += 8;
553
554	return &ahc->platform_data->starget[target_offset];
555	}
556
557	static int
558	ahc_linux_target_alloc(struct scsi_target *starget)
559	{
560	struct ahc_softc *ahc =
561	*((struct ahc_softc **)dev_to_shost(dev: &starget->dev)->hostdata);
562	struct seeprom_config *sc = ahc->seep_config;
563	unsigned long flags;
564	struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
565	unsigned short scsirate;
566	struct ahc_devinfo devinfo;
567	char channel = starget->channel + 'A';
568	unsigned int our_id = ahc->our_id;
569	unsigned int target_offset;
570
571	target_offset = starget->id;
572	if (starget->channel != 0)
573	target_offset += 8;
574
575	if (starget->channel)
576	our_id = ahc->our_id_b;
577
578	ahc_lock(ahc, flags: &flags);
579
580	BUG_ON(*ahc_targp != NULL);
581
582	*ahc_targp = starget;
583
584	if (sc) {
585	int maxsync = AHC_SYNCRATE_DT;
586	int ultra = 0;
587	int flags = sc->device_flags[target_offset];
588
589	if (ahc->flags & AHC_NEWEEPROM_FMT) {
590	if (flags & CFSYNCHISULTRA)
591	ultra = 1;
592	} else if (flags & CFULTRAEN)
593	ultra = 1;
594	/* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
595	* change it to ultra=0, CFXFER = 0 */
596	if(ultra && (flags & CFXFER) == 0x04) {
597	ultra = 0;
598	flags &= ~CFXFER;
599	}
600
601	if ((ahc->features & AHC_ULTRA2) != 0) {
602	scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
603	} else {
604	scsirate = (flags & CFXFER) << 4;
605	maxsync = ultra ? AHC_SYNCRATE_ULTRA :
606	AHC_SYNCRATE_FAST;
607	}
608	spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
609	if (!(flags & CFSYNCH))
610	spi_max_offset(starget) = 0;
611	spi_min_period(starget) =
612	ahc_find_period(ahc, scsirate, maxsync);
613	}
614	ahc_compile_devinfo(devinfo: &devinfo, our_id, target: starget->id,
615	CAM_LUN_WILDCARD, channel,
616	role: ROLE_INITIATOR);
617	ahc_set_syncrate(ahc, devinfo: &devinfo, NULL, period: 0, offset: 0, ppr_options: 0,
618	AHC_TRANS_GOAL, /*paused*/FALSE);
619	ahc_set_width(ahc, devinfo: &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
620	AHC_TRANS_GOAL, /*paused*/FALSE);
621	ahc_unlock(ahc, flags: &flags);
622
623	return 0;
624	}
625
626	static void
627	ahc_linux_target_destroy(struct scsi_target *starget)
628	{
629	struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
630
631	*ahc_targp = NULL;
632	}
633
634	static int
635	ahc_linux_slave_alloc(struct scsi_device *sdev)
636	{
637	struct ahc_softc *ahc =
638	*((struct ahc_softc **)sdev->host->hostdata);
639	struct scsi_target *starget = sdev->sdev_target;
640	struct ahc_linux_device *dev;
641
642	if (bootverbose)
643	printk("%s: Slave Alloc %d\n", ahc_name(ahc), sdev->id);
644
645	dev = scsi_transport_device_data(sdev);
646	memset(dev, 0, sizeof(*dev));
647
648	/*
649	* We start out life using untagged
650	* transactions of which we allow one.
651	*/
652	dev->openings = 1;
653
654	/*
655	* Set maxtags to 0. This will be changed if we
656	* later determine that we are dealing with
657	* a tagged queuing capable device.
658	*/
659	dev->maxtags = 0;
660
661	spi_period(starget) = 0;
662
663	return 0;
664	}
665
666	static int
667	ahc_linux_slave_configure(struct scsi_device *sdev)
668	{
669	if (bootverbose)
670	sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
671
672	ahc_linux_device_queue_depth(sdev);
673
674	/* Initial Domain Validation */
675	if (!spi_initial_dv(sdev->sdev_target))
676	spi_dv_device(sdev);
677
678	return 0;
679	}
680
681	#if defined(__i386__)
682	/*
683	* Return the disk geometry for the given SCSI device.
684	*/
685	static int
686	ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
687	sector_t capacity, int geom[])
688	{
689	int heads;
690	int sectors;
691	int cylinders;
692	int extended;
693	struct ahc_softc *ahc;
694	u_int channel;
695
696	ahc = *((struct ahc_softc **)sdev->host->hostdata);
697	channel = sdev_channel(sdev);
698
699	if (scsi_partsize(bdev, capacity, geom))
700	return 0;
701
702	heads = 64;
703	sectors = 32;
704	cylinders = aic_sector_div(capacity, heads, sectors);
705
706	if (aic7xxx_extended != 0)
707	extended = 1;
708	else if (channel == 0)
709	extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
710	else
711	extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
712	if (extended && cylinders >= 1024) {
713	heads = 255;
714	sectors = 63;
715	cylinders = aic_sector_div(capacity, heads, sectors);
716	}
717	geom[0] = heads;
718	geom[1] = sectors;
719	geom[2] = cylinders;
720	return (0);
721	}
722	#endif
723
724	/*
725	* Abort the current SCSI command(s).
726	*/
727	static int
728	ahc_linux_abort(struct scsi_cmnd *cmd)
729	{
730	int error;
731
732	error = ahc_linux_queue_recovery_cmd(sdev: cmd->device, cmd);
733	if (error != SUCCESS)
734	printk("aic7xxx_abort returns 0x%x\n", error);
735	return (error);
736	}
737
738	/*
739	* Attempt to send a target reset message to the device that timed out.
740	*/
741	static int
742	ahc_linux_dev_reset(struct scsi_cmnd *cmd)
743	{
744	int error;
745
746	error = ahc_linux_queue_recovery_cmd(sdev: cmd->device, NULL);
747	if (error != SUCCESS)
748	printk("aic7xxx_dev_reset returns 0x%x\n", error);
749	return (error);
750	}
751
752	/*
753	* Reset the SCSI bus.
754	*/
755	static int
756	ahc_linux_bus_reset(struct scsi_cmnd *cmd)
757	{
758	struct ahc_softc *ahc;
759	int found;
760	unsigned long flags;
761
762	ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
763
764	ahc_lock(ahc, flags: &flags);
765	found = ahc_reset_channel(ahc, scmd_channel(cmd) + 'A',
766	/*initiate reset*/TRUE);
767	ahc_unlock(ahc, flags: &flags);
768
769	if (bootverbose)
770	printk("%s: SCSI bus reset delivered. "
771	"%d SCBs aborted.\n", ahc_name(ahc), found);
772
773	return SUCCESS;
774	}
775
776	struct scsi_host_template aic7xxx_driver_template = {
777	.module = THIS_MODULE,
778	.name = "aic7xxx",
779	.proc_name = "aic7xxx",
780	.show_info = ahc_linux_show_info,
781	.write_info = ahc_proc_write_seeprom,
782	.info = ahc_linux_info,
783	.queuecommand = ahc_linux_queue,
784	.eh_abort_handler = ahc_linux_abort,
785	.eh_device_reset_handler = ahc_linux_dev_reset,
786	.eh_bus_reset_handler = ahc_linux_bus_reset,
787	#if defined(__i386__)
788	.bios_param = ahc_linux_biosparam,
789	#endif
790	.can_queue = AHC_MAX_QUEUE,
791	.this_id = -1,
792	.max_sectors = 8192,
793	.cmd_per_lun = 2,
794	.slave_alloc = ahc_linux_slave_alloc,
795	.slave_configure = ahc_linux_slave_configure,
796	.target_alloc = ahc_linux_target_alloc,
797	.target_destroy = ahc_linux_target_destroy,
798	};
799
800	/**************************** Tasklet Handler *********************************/
801
802
803	static inline unsigned int ahc_build_scsiid(struct ahc_softc *ahc,
804	struct scsi_device *sdev)
805	{
806	unsigned int scsiid = (sdev->id << TID_SHIFT) & TID;
807
808	if (sdev->channel == 0)
809	scsiid |= ahc->our_id;
810	else
811	scsiid |= ahc->our_id_b | TWIN_CHNLB;
812	return scsiid;
813	}
814
815	/******************************** Bus DMA *************************************/
816	int
817	ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
818	bus_size_t alignment, bus_size_t boundary,
819	dma_addr_t lowaddr, dma_addr_t highaddr,
820	bus_dma_filter_t *filter, void *filterarg,
821	bus_size_t maxsize, int nsegments,
822	bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
823	{
824	bus_dma_tag_t dmat;
825
826	dmat = kmalloc(size: sizeof(*dmat), GFP_ATOMIC);
827	if (dmat == NULL)
828	return (ENOMEM);
829
830	/*
831	* Linux is very simplistic about DMA memory. For now don't
832	* maintain all specification information. Once Linux supplies
833	* better facilities for doing these operations, or the
834	* needs of this particular driver change, we might need to do
835	* more here.
836	*/
837	dmat->alignment = alignment;
838	dmat->boundary = boundary;
839	dmat->maxsize = maxsize;
840	*ret_tag = dmat;
841	return (0);
842	}
843
844	void
845	ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
846	{
847	kfree(objp: dmat);
848	}
849
850	int
851	ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
852	int flags, bus_dmamap_t *mapp)
853	{
854	/* XXX: check if we really need the GFP_ATOMIC and unwind this mess! */
855	*vaddr = dma_alloc_coherent(dev: ahc->dev, size: dmat->maxsize, dma_handle: mapp, GFP_ATOMIC);
856	if (*vaddr == NULL)
857	return ENOMEM;
858	return 0;
859	}
860
861	void
862	ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
863	void* vaddr, bus_dmamap_t map)
864	{
865	dma_free_coherent(dev: ahc->dev, size: dmat->maxsize, cpu_addr: vaddr, dma_handle: map);
866	}
867
868	int
869	ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
870	void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
871	void *cb_arg, int flags)
872	{
873	/*
874	* Assume for now that this will only be used during
875	* initialization and not for per-transaction buffer mapping.
876	*/
877	bus_dma_segment_t stack_sg;
878
879	stack_sg.ds_addr = map;
880	stack_sg.ds_len = dmat->maxsize;
881	cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
882	return (0);
883	}
884
885	void
886	ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
887	{
888	}
889
890	int
891	ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
892	{
893	/* Nothing to do */
894	return (0);
895	}
896
897	static void
898	ahc_linux_setup_tag_info_global(char *p)
899	{
900	int tags, i, j;
901
902	tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
903	printk("Setting Global Tags= %d\n", tags);
904
905	for (i = 0; i < ARRAY_SIZE(aic7xxx_tag_info); i++) {
906	for (j = 0; j < AHC_NUM_TARGETS; j++) {
907	aic7xxx_tag_info[i].tag_commands[j] = tags;
908	}
909	}
910	}
911
912	static void
913	ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
914	{
915
916	if ((instance >= 0) && (targ >= 0)
917	&& (instance < ARRAY_SIZE(aic7xxx_tag_info))
918	&& (targ < AHC_NUM_TARGETS)) {
919	aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
920	if (bootverbose)
921	printk("tag_info[%d:%d] = %d\n", instance, targ, value);
922	}
923	}
924
925	static char *
926	ahc_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
927	void (*callback)(u_long, int, int, int32_t),
928	u_long callback_arg)
929	{
930	char *tok_end;
931	char *tok_end2;
932	int i;
933	int instance;
934	int targ;
935	int done;
936	char tok_list[] = {'.', ',', '{', '}', '\0'};
937
938	/* All options use a ':' name/arg separator */
939	if (*opt_arg != ':')
940	return (opt_arg);
941	opt_arg++;
942	instance = -1;
943	targ = -1;
944	done = FALSE;
945	/*
946	* Restore separator that may be in
947	* the middle of our option argument.
948	*/
949	tok_end = strchr(opt_arg, '\0');
950	if (tok_end < end)
951	*tok_end = ',';
952	while (!done) {
953	switch (*opt_arg) {
954	case '{':
955	if (instance == -1) {
956	instance = 0;
957	} else {
958	if (depth > 1) {
959	if (targ == -1)
960	targ = 0;
961	} else {
962	printk("Malformed Option %s\n",
963	opt_name);
964	done = TRUE;
965	}
966	}
967	opt_arg++;
968	break;
969	case '}':
970	if (targ != -1)
971	targ = -1;
972	else if (instance != -1)
973	instance = -1;
974	opt_arg++;
975	break;
976	case ',':
977	case '.':
978	if (instance == -1)
979	done = TRUE;
980	else if (targ >= 0)
981	targ++;
982	else if (instance >= 0)
983	instance++;
984	opt_arg++;
985	break;
986	case '\0':
987	done = TRUE;
988	break;
989	default:
990	tok_end = end;
991	for (i = 0; tok_list[i]; i++) {
992	tok_end2 = strchr(opt_arg, tok_list[i]);
993	if ((tok_end2) && (tok_end2 < tok_end))
994	tok_end = tok_end2;
995	}
996	callback(callback_arg, instance, targ,
997	simple_strtol(opt_arg, NULL, 0));
998	opt_arg = tok_end;
999	break;
1000	}
1001	}
1002	return (opt_arg);
1003	}
1004
1005	/*
1006	* Handle Linux boot parameters. This routine allows for assigning a value
1007	* to a parameter with a ':' between the parameter and the value.
1008	* ie. aic7xxx=stpwlev:1,extended
1009	*/
1010	static int
1011	aic7xxx_setup(char *s)
1012	{
1013	int i, n;
1014	char *p;
1015	char *end;
1016
1017	static const struct {
1018	const char *name;
1019	uint32_t *flag;
1020	} options[] = {
1021	{ "extended", &aic7xxx_extended },
1022	{ "no_reset", &aic7xxx_no_reset },
1023	{ "verbose", &aic7xxx_verbose },
1024	{ "allow_memio", &aic7xxx_allow_memio},
1025	#ifdef AHC_DEBUG
1026	{ "debug", &ahc_debug },
1027	#endif
1028	{ "periodic_otag", &aic7xxx_periodic_otag },
1029	{ "pci_parity", &aic7xxx_pci_parity },
1030	{ "seltime", &aic7xxx_seltime },
1031	{ "tag_info", NULL },
1032	{ "global_tag_depth", NULL },
1033	{ "dv", NULL }
1034	};
1035
1036	end = strchr(s, '\0');
1037
1038	/*
1039	* XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
1040	* will never be 0 in this case.
1041	*/
1042	n = 0;
1043
1044	while ((p = strsep(&s, ",.")) != NULL) {
1045	if (*p == '\0')
1046	continue;
1047	for (i = 0; i < ARRAY_SIZE(options); i++) {
1048
1049	n = strlen(options[i].name);
1050	if (strncmp(options[i].name, p, n) == 0)
1051	break;
1052	}
1053	if (i == ARRAY_SIZE(options))
1054	continue;
1055
1056	if (strncmp(p, "global_tag_depth", n) == 0) {
1057	ahc_linux_setup_tag_info_global(p: p + n);
1058	} else if (strncmp(p, "tag_info", n) == 0) {
1059	s = ahc_parse_brace_option(opt_name: "tag_info", opt_arg: p + n, end,
1060	depth: 2, callback: ahc_linux_setup_tag_info, callback_arg: 0);
1061	} else if (p[n] == ':') {
1062	*(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1063	} else if (strncmp(p, "verbose", n) == 0) {
1064	*(options[i].flag) = 1;
1065	} else {
1066	*(options[i].flag) ^= 0xFFFFFFFF;
1067	}
1068	}
1069	return 1;
1070	}
1071
1072	__setup("aic7xxx=", aic7xxx_setup);
1073
1074	uint32_t aic7xxx_verbose;
1075
1076	int
1077	ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1078	{
1079	char buf[80];
1080	struct Scsi_Host *host;
1081	char *new_name;
1082	u_long s;
1083	int retval;
1084
1085	template->name = ahc->description;
1086	host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1087	if (host == NULL)
1088	return (ENOMEM);
1089
1090	*((struct ahc_softc **)host->hostdata) = ahc;
1091	ahc->platform_data->host = host;
1092	host->can_queue = AHC_MAX_QUEUE;
1093	host->cmd_per_lun = 2;
1094	/* XXX No way to communicate the ID for multiple channels */
1095	host->this_id = ahc->our_id;
1096	host->irq = ahc->platform_data->irq;
1097	host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1098	host->max_lun = AHC_NUM_LUNS;
1099	host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1100	host->sg_tablesize = AHC_NSEG;
1101	ahc_lock(ahc, flags: &s);
1102	ahc_set_unit(ahc, ahc_linux_unit++);
1103	ahc_unlock(ahc, flags: &s);
1104	sprintf(buf, fmt: "scsi%d", host->host_no);
1105	new_name = kmalloc(strlen(buf) + 1, GFP_ATOMIC);
1106	if (new_name != NULL) {
1107	strcpy(p: new_name, q: buf);
1108	ahc_set_name(ahc, new_name);
1109	}
1110	host->unique_id = ahc->unit;
1111	ahc_linux_initialize_scsi_bus(ahc);
1112	ahc_intr_enable(ahc, TRUE);
1113
1114	host->transportt = ahc_linux_transport_template;
1115
1116	retval = scsi_add_host(host, dev: ahc->dev);
1117	if (retval) {
1118	printk(KERN_WARNING "aic7xxx: scsi_add_host failed\n");
1119	scsi_host_put(t: host);
1120	return retval;
1121	}
1122
1123	scsi_scan_host(host);
1124	return 0;
1125	}
1126
1127	/*
1128	* Place the SCSI bus into a known state by either resetting it,
1129	* or forcing transfer negotiations on the next command to any
1130	* target.
1131	*/
1132	static void
1133	ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1134	{
1135	int i;
1136	int numtarg;
1137	unsigned long s;
1138
1139	i = 0;
1140	numtarg = 0;
1141
1142	ahc_lock(ahc, flags: &s);
1143
1144	if (aic7xxx_no_reset != 0)
1145	ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1146
1147	if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1148	ahc_reset_channel(ahc, channel: 'A', /*initiate_reset*/TRUE);
1149	else
1150	numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1151
1152	if ((ahc->features & AHC_TWIN) != 0) {
1153
1154	if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1155	ahc_reset_channel(ahc, channel: 'B', /*initiate_reset*/TRUE);
1156	} else {
1157	if (numtarg == 0)
1158	i = 8;
1159	numtarg += 8;
1160	}
1161	}
1162
1163	/*
1164	* Force negotiation to async for all targets that
1165	* will not see an initial bus reset.
1166	*/
1167	for (; i < numtarg; i++) {
1168	struct ahc_devinfo devinfo;
1169	struct ahc_initiator_tinfo *tinfo;
1170	struct ahc_tmode_tstate *tstate;
1171	u_int our_id;
1172	u_int target_id;
1173	char channel;
1174
1175	channel = 'A';
1176	our_id = ahc->our_id;
1177	target_id = i;
1178	if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1179	channel = 'B';
1180	our_id = ahc->our_id_b;
1181	target_id = i % 8;
1182	}
1183	tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1184	remote_id: target_id, tstate: &tstate);
1185	ahc_compile_devinfo(devinfo: &devinfo, our_id, target: target_id,
1186	CAM_LUN_WILDCARD, channel, role: ROLE_INITIATOR);
1187	ahc_update_neg_request(ahc, &devinfo, tstate,
1188	tinfo, AHC_NEG_ALWAYS);
1189	}
1190	ahc_unlock(ahc, flags: &s);
1191	/* Give the bus some time to recover */
1192	if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1193	ahc_linux_freeze_simq(ahc);
1194	msleep(AIC7XXX_RESET_DELAY);
1195	ahc_linux_release_simq(ahc);
1196	}
1197	}
1198
1199	int
1200	ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1201	{
1202
1203	ahc->platform_data =
1204	kzalloc(size: sizeof(struct ahc_platform_data), GFP_ATOMIC);
1205	if (ahc->platform_data == NULL)
1206	return (ENOMEM);
1207	ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1208	ahc_lockinit(ahc);
1209	ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1210	ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1211	if (aic7xxx_pci_parity == 0)
1212	ahc->flags |= AHC_DISABLE_PCI_PERR;
1213
1214	return (0);
1215	}
1216
1217	void
1218	ahc_platform_free(struct ahc_softc *ahc)
1219	{
1220	struct scsi_target *starget;
1221	int i;
1222
1223	if (ahc->platform_data != NULL) {
1224	/* destroy all of the device and target objects */
1225	for (i = 0; i < AHC_NUM_TARGETS; i++) {
1226	starget = ahc->platform_data->starget[i];
1227	if (starget != NULL) {
1228	ahc->platform_data->starget[i] = NULL;
1229	}
1230	}
1231
1232	if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1233	free_irq(ahc->platform_data->irq, ahc);
1234	if (ahc->tag == BUS_SPACE_PIO
1235	&& ahc->bsh.ioport != 0)
1236	release_region(ahc->bsh.ioport, 256);
1237	if (ahc->tag == BUS_SPACE_MEMIO
1238	&& ahc->bsh.maddr != NULL) {
1239	iounmap(addr: ahc->bsh.maddr);
1240	release_mem_region(ahc->platform_data->mem_busaddr,
1241	0x1000);
1242	}
1243
1244	if (ahc->platform_data->host)
1245	scsi_host_put(t: ahc->platform_data->host);
1246
1247	kfree(objp: ahc->platform_data);
1248	}
1249	}
1250
1251	void
1252	ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1253	{
1254	ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1255	SCB_GET_CHANNEL(ahc, scb),
1256	SCB_GET_LUN(scb), SCB_LIST_NULL,
1257	ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1258	}
1259
1260	void
1261	ahc_platform_set_tags(struct ahc_softc *ahc, struct scsi_device *sdev,
1262	struct ahc_devinfo *devinfo, ahc_queue_alg alg)
1263	{
1264	struct ahc_linux_device *dev;
1265	int was_queuing;
1266	int now_queuing;
1267
1268	if (sdev == NULL)
1269	return;
1270	dev = scsi_transport_device_data(sdev);
1271
1272	was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1273	switch (alg) {
1274	default:
1275	case AHC_QUEUE_NONE:
1276	now_queuing = 0;
1277	break;
1278	case AHC_QUEUE_BASIC:
1279	now_queuing = AHC_DEV_Q_BASIC;
1280	break;
1281	case AHC_QUEUE_TAGGED:
1282	now_queuing = AHC_DEV_Q_TAGGED;
1283	break;
1284	}
1285	if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1286	&& (was_queuing != now_queuing)
1287	&& (dev->active != 0)) {
1288	dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1289	dev->qfrozen++;
1290	}
1291
1292	dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1293	if (now_queuing) {
1294	u_int usertags;
1295
1296	usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1297	if (!was_queuing) {
1298	/*
1299	* Start out aggressively and allow our
1300	* dynamic queue depth algorithm to take
1301	* care of the rest.
1302	*/
1303	dev->maxtags = usertags;
1304	dev->openings = dev->maxtags - dev->active;
1305	}
1306	if (dev->maxtags == 0) {
1307	/*
1308	* Queueing is disabled by the user.
1309	*/
1310	dev->openings = 1;
1311	} else if (alg == AHC_QUEUE_TAGGED) {
1312	dev->flags |= AHC_DEV_Q_TAGGED;
1313	if (aic7xxx_periodic_otag != 0)
1314	dev->flags |= AHC_DEV_PERIODIC_OTAG;
1315	} else
1316	dev->flags |= AHC_DEV_Q_BASIC;
1317	} else {
1318	/* We can only have one opening. */
1319	dev->maxtags = 0;
1320	dev->openings = 1 - dev->active;
1321	}
1322	switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1323	case AHC_DEV_Q_BASIC:
1324	case AHC_DEV_Q_TAGGED:
1325	scsi_change_queue_depth(sdev,
1326	dev->openings + dev->active);
1327	break;
1328	default:
1329	/*
1330	* We allow the OS to queue 2 untagged transactions to
1331	* us at any time even though we can only execute them
1332	* serially on the controller/device. This should
1333	* remove some latency.
1334	*/
1335	scsi_change_queue_depth(sdev, 2);
1336	break;
1337	}
1338	}
1339
1340	int
1341	ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1342	int lun, u_int tag, role_t role, uint32_t status)
1343	{
1344	return 0;
1345	}
1346
1347	static u_int
1348	ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1349	{
1350	static int warned_user;
1351	u_int tags;
1352
1353	tags = 0;
1354	if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1355	if (ahc->unit >= ARRAY_SIZE(aic7xxx_tag_info)) {
1356	if (warned_user == 0) {
1357
1358	printk(KERN_WARNING
1359	"aic7xxx: WARNING: Insufficient tag_info instances\n"
1360	"aic7xxx: for installed controllers. Using defaults\n"
1361	"aic7xxx: Please update the aic7xxx_tag_info array in\n"
1362	"aic7xxx: the aic7xxx_osm..c source file.\n");
1363	warned_user++;
1364	}
1365	tags = AHC_MAX_QUEUE;
1366	} else {
1367	adapter_tag_info_t *tag_info;
1368
1369	tag_info = &aic7xxx_tag_info[ahc->unit];
1370	tags = tag_info->tag_commands[devinfo->target_offset];
1371	if (tags > AHC_MAX_QUEUE)
1372	tags = AHC_MAX_QUEUE;
1373	}
1374	}
1375	return (tags);
1376	}
1377
1378	/*
1379	* Determines the queue depth for a given device.
1380	*/
1381	static void
1382	ahc_linux_device_queue_depth(struct scsi_device *sdev)
1383	{
1384	struct ahc_devinfo devinfo;
1385	u_int tags;
1386	struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
1387
1388	ahc_compile_devinfo(devinfo: &devinfo,
1389	our_id: sdev->sdev_target->channel == 0
1390	? ahc->our_id : ahc->our_id_b,
1391	target: sdev->sdev_target->id, lun: sdev->lun,
1392	channel: sdev->sdev_target->channel == 0 ? 'A' : 'B',
1393	role: ROLE_INITIATOR);
1394	tags = ahc_linux_user_tagdepth(ahc, devinfo: &devinfo);
1395	if (tags != 0 && sdev->tagged_supported != 0) {
1396
1397	ahc_platform_set_tags(ahc, sdev, devinfo: &devinfo, alg: AHC_QUEUE_TAGGED);
1398	ahc_send_async(ahc, channel: devinfo.channel, target: devinfo.target,
1399	lun: devinfo.lun, AC_TRANSFER_NEG);
1400	ahc_print_devinfo(ahc, dev: &devinfo);
1401	printk("Tagged Queuing enabled. Depth %d\n", tags);
1402	} else {
1403	ahc_platform_set_tags(ahc, sdev, devinfo: &devinfo, alg: AHC_QUEUE_NONE);
1404	ahc_send_async(ahc, channel: devinfo.channel, target: devinfo.target,
1405	lun: devinfo.lun, AC_TRANSFER_NEG);
1406	}
1407	}
1408
1409	static int
1410	ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1411	struct scsi_cmnd *cmd)
1412	{
1413	struct scb *scb;
1414	struct hardware_scb *hscb;
1415	struct ahc_initiator_tinfo *tinfo;
1416	struct ahc_tmode_tstate *tstate;
1417	uint16_t mask;
1418	struct scb_tailq *untagged_q = NULL;
1419	int nseg;
1420
1421	/*
1422	* Schedule us to run later. The only reason we are not
1423	* running is because the whole controller Q is frozen.
1424	*/
1425	if (ahc->platform_data->qfrozen != 0)
1426	return SCSI_MLQUEUE_HOST_BUSY;
1427
1428	/*
1429	* We only allow one untagged transaction
1430	* per target in the initiator role unless
1431	* we are storing a full busy target *lun*
1432	* table in SCB space.
1433	*/
1434	if (!(cmd->flags & SCMD_TAGGED)
1435	&& (ahc->features & AHC_SCB_BTT) == 0) {
1436	int target_offset;
1437
1438	target_offset = cmd->device->id + cmd->device->channel * 8;
1439	untagged_q = &(ahc->untagged_queues[target_offset]);
1440	if (!TAILQ_EMPTY(untagged_q))
1441	/* if we're already executing an untagged command
1442	* we're busy to another */
1443	return SCSI_MLQUEUE_DEVICE_BUSY;
1444	}
1445
1446	nseg = scsi_dma_map(cmd);
1447	if (nseg < 0)
1448	return SCSI_MLQUEUE_HOST_BUSY;
1449
1450	/*
1451	* Get an scb to use.
1452	*/
1453	scb = ahc_get_scb(ahc);
1454	if (!scb) {
1455	scsi_dma_unmap(cmd);
1456	return SCSI_MLQUEUE_HOST_BUSY;
1457	}
1458
1459	scb->io_ctx = cmd;
1460	scb->platform_data->dev = dev;
1461	hscb = scb->hscb;
1462	cmd->host_scribble = (char *)scb;
1463
1464	/*
1465	* Fill out basics of the HSCB.
1466	*/
1467	hscb->control = 0;
1468	hscb->scsiid = ahc_build_scsiid(ahc, sdev: cmd->device);
1469	hscb->lun = cmd->device->lun;
1470	mask = SCB_GET_TARGET_MASK(ahc, scb);
1471	tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1472	SCB_GET_OUR_ID(scb),
1473	SCB_GET_TARGET(ahc, scb), &tstate);
1474	hscb->scsirate = tinfo->scsirate;
1475	hscb->scsioffset = tinfo->curr.offset;
1476	if ((tstate->ultraenb & mask) != 0)
1477	hscb->control |= ULTRAENB;
1478
1479	if ((ahc->user_discenable & mask) != 0)
1480	hscb->control |= DISCENB;
1481
1482	if ((tstate->auto_negotiate & mask) != 0) {
1483	scb->flags |= SCB_AUTO_NEGOTIATE;
1484	scb->hscb->control |= MK_MESSAGE;
1485	}
1486
1487	if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1488	if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1489	&& (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1490	hscb->control |= ORDERED_QUEUE_TAG;
1491	dev->commands_since_idle_or_otag = 0;
1492	} else {
1493	hscb->control |= SIMPLE_QUEUE_TAG;
1494	}
1495	}
1496
1497	hscb->cdb_len = cmd->cmd_len;
1498	if (hscb->cdb_len <= 12) {
1499	memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1500	} else {
1501	memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1502	scb->flags |= SCB_CDB32_PTR;
1503	}
1504
1505	scb->platform_data->xfer_len = 0;
1506	ahc_set_residual(scb, resid: 0);
1507	ahc_set_sense_residual(scb, resid: 0);
1508	scb->sg_count = 0;
1509
1510	if (nseg > 0) {
1511	struct ahc_dma_seg *sg;
1512	struct scatterlist *cur_seg;
1513	int i;
1514
1515	/* Copy the segments into the SG list. */
1516	sg = scb->sg_list;
1517	/*
1518	* The sg_count may be larger than nseg if
1519	* a transfer crosses a 32bit page.
1520	*/
1521	scsi_for_each_sg(cmd, cur_seg, nseg, i) {
1522	dma_addr_t addr;
1523	bus_size_t len;
1524	int consumed;
1525
1526	addr = sg_dma_address(cur_seg);
1527	len = sg_dma_len(cur_seg);
1528	consumed = ahc_linux_map_seg(ahc, scb,
1529	sg, addr, len);
1530	sg += consumed;
1531	scb->sg_count += consumed;
1532	}
1533	sg--;
1534	sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1535
1536	/*
1537	* Reset the sg list pointer.
1538	*/
1539	scb->hscb->sgptr =
1540	ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1541
1542	/*
1543	* Copy the first SG into the "current"
1544	* data pointer area.
1545	*/
1546	scb->hscb->dataptr = scb->sg_list->addr;
1547	scb->hscb->datacnt = scb->sg_list->len;
1548	} else {
1549	scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1550	scb->hscb->dataptr = 0;
1551	scb->hscb->datacnt = 0;
1552	scb->sg_count = 0;
1553	}
1554
1555	LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1556	dev->openings--;
1557	dev->active++;
1558	dev->commands_issued++;
1559	if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1560	dev->commands_since_idle_or_otag++;
1561
1562	scb->flags |= SCB_ACTIVE;
1563	if (untagged_q) {
1564	TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1565	scb->flags |= SCB_UNTAGGEDQ;
1566	}
1567	ahc_queue_scb(ahc, scb);
1568	return 0;
1569	}
1570
1571	/*
1572	* SCSI controller interrupt handler.
1573	*/
1574	irqreturn_t
1575	ahc_linux_isr(int irq, void *dev_id)
1576	{
1577	struct ahc_softc *ahc;
1578	u_long flags;
1579	int ours;
1580
1581	ahc = (struct ahc_softc *) dev_id;
1582	ahc_lock(ahc, flags: &flags);
1583	ours = ahc_intr(ahc);
1584	ahc_unlock(ahc, flags: &flags);
1585	return IRQ_RETVAL(ours);
1586	}
1587
1588	void
1589	ahc_platform_flushwork(struct ahc_softc *ahc)
1590	{
1591
1592	}
1593
1594	void
1595	ahc_send_async(struct ahc_softc *ahc, char channel,
1596	u_int target, u_int lun, ac_code code)
1597	{
1598	switch (code) {
1599	case AC_TRANSFER_NEG:
1600	{
1601	struct scsi_target *starget;
1602	struct ahc_initiator_tinfo *tinfo;
1603	struct ahc_tmode_tstate *tstate;
1604	int target_offset;
1605	unsigned int target_ppr_options;
1606
1607	BUG_ON(target == CAM_TARGET_WILDCARD);
1608
1609	tinfo = ahc_fetch_transinfo(ahc, channel,
1610	our_id: channel == 'A' ? ahc->our_id
1611	: ahc->our_id_b,
1612	remote_id: target, tstate: &tstate);
1613
1614	/*
1615	* Don't bother reporting results while
1616	* negotiations are still pending.
1617	*/
1618	if (tinfo->curr.period != tinfo->goal.period
1619	|| tinfo->curr.width != tinfo->goal.width
1620	|| tinfo->curr.offset != tinfo->goal.offset
1621	|| tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1622	if (bootverbose == 0)
1623	break;
1624
1625	/*
1626	* Don't bother reporting results that
1627	* are identical to those last reported.
1628	*/
1629	target_offset = target;
1630	if (channel == 'B')
1631	target_offset += 8;
1632	starget = ahc->platform_data->starget[target_offset];
1633	if (starget == NULL)
1634	break;
1635
1636	target_ppr_options =
1637	(spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1638	+ (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1639	+ (spi_iu(starget) ? MSG_EXT_PPR_IU_REQ : 0);
1640
1641	if (tinfo->curr.period == spi_period(starget)
1642	&& tinfo->curr.width == spi_width(starget)
1643	&& tinfo->curr.offset == spi_offset(starget)
1644	&& tinfo->curr.ppr_options == target_ppr_options)
1645	if (bootverbose == 0)
1646	break;
1647
1648	spi_period(starget) = tinfo->curr.period;
1649	spi_width(starget) = tinfo->curr.width;
1650	spi_offset(starget) = tinfo->curr.offset;
1651	spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1652	spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1653	spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1654	spi_display_xfer_agreement(starget);
1655	break;
1656	}
1657	case AC_SENT_BDR:
1658	{
1659	WARN_ON(lun != CAM_LUN_WILDCARD);
1660	scsi_report_device_reset(ahc->platform_data->host,
1661	channel - 'A', target);
1662	break;
1663	}
1664	case AC_BUS_RESET:
1665	if (ahc->platform_data->host != NULL) {
1666	scsi_report_bus_reset(ahc->platform_data->host,
1667	channel - 'A');
1668	}
1669	break;
1670	default:
1671	panic(fmt: "ahc_send_async: Unexpected async event");
1672	}
1673	}
1674
1675	/*
1676	* Calls the higher level scsi done function and frees the scb.
1677	*/
1678	void
1679	ahc_done(struct ahc_softc *ahc, struct scb *scb)
1680	{
1681	struct scsi_cmnd *cmd;
1682	struct ahc_linux_device *dev;
1683
1684	LIST_REMOVE(scb, pending_links);
1685	if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1686	struct scb_tailq *untagged_q;
1687	int target_offset;
1688
1689	target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1690	untagged_q = &(ahc->untagged_queues[target_offset]);
1691	TAILQ_REMOVE(untagged_q, scb, links.tqe);
1692	BUG_ON(!TAILQ_EMPTY(untagged_q));
1693	} else if ((scb->flags & SCB_ACTIVE) == 0) {
1694	/*
1695	* Transactions aborted from the untagged queue may
1696	* not have been dispatched to the controller, so
1697	* only check the SCB_ACTIVE flag for tagged transactions.
1698	*/
1699	printk("SCB %d done'd twice\n", scb->hscb->tag);
1700	ahc_dump_card_state(ahc);
1701	panic(fmt: "Stopping for safety");
1702	}
1703	cmd = scb->io_ctx;
1704	dev = scb->platform_data->dev;
1705	dev->active--;
1706	dev->openings++;
1707	if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1708	cmd->result &= ~(CAM_DEV_QFRZN << 16);
1709	dev->qfrozen--;
1710	}
1711	ahc_linux_unmap_scb(ahc, scb);
1712
1713	/*
1714	* Guard against stale sense data.
1715	* The Linux mid-layer assumes that sense
1716	* was retrieved anytime the first byte of
1717	* the sense buffer looks "sane".
1718	*/
1719	cmd->sense_buffer[0] = 0;
1720	if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1721	#ifdef AHC_REPORT_UNDERFLOWS
1722	uint32_t amount_xferred;
1723
1724	amount_xferred =
1725	ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1726	#endif
1727	if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1728	#ifdef AHC_DEBUG
1729	if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1730	ahc_print_path(ahc, scb);
1731	printk("Set CAM_UNCOR_PARITY\n");
1732	}
1733	#endif
1734	ahc_set_transaction_status(scb, status: CAM_UNCOR_PARITY);
1735	#ifdef AHC_REPORT_UNDERFLOWS
1736	/*
1737	* This code is disabled by default as some
1738	* clients of the SCSI system do not properly
1739	* initialize the underflow parameter. This
1740	* results in spurious termination of commands
1741	* that complete as expected (e.g. underflow is
1742	* allowed as command can return variable amounts
1743	* of data.
1744	*/
1745	} else if (amount_xferred < scb->io_ctx->underflow) {
1746	u_int i;
1747
1748	ahc_print_path(ahc, scb);
1749	printk("CDB:");
1750	for (i = 0; i < scb->io_ctx->cmd_len; i++)
1751	printk(" 0x%x", scb->io_ctx->cmnd[i]);
1752	printk("\n");
1753	ahc_print_path(ahc, scb);
1754	printk("Saw underflow (%ld of %ld bytes). "
1755	"Treated as error\n",
1756	ahc_get_residual(scb),
1757	ahc_get_transfer_length(scb));
1758	ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1759	#endif
1760	} else {
1761	ahc_set_transaction_status(scb, status: CAM_REQ_CMP);
1762	}
1763	} else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1764	ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
1765	}
1766
1767	if (dev->openings == 1
1768	&& ahc_get_transaction_status(scb) == CAM_REQ_CMP
1769	&& ahc_get_scsi_status(scb) != SAM_STAT_TASK_SET_FULL)
1770	dev->tag_success_count++;
1771	/*
1772	* Some devices deal with temporary internal resource
1773	* shortages by returning queue full. When the queue
1774	* full occurrs, we throttle back. Slowly try to get
1775	* back to our previous queue depth.
1776	*/
1777	if ((dev->openings + dev->active) < dev->maxtags
1778	&& dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
1779	dev->tag_success_count = 0;
1780	dev->openings++;
1781	}
1782
1783	if (dev->active == 0)
1784	dev->commands_since_idle_or_otag = 0;
1785
1786	if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1787	printk("Recovery SCB completes\n");
1788	if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
1789	|| ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
1790	ahc_set_transaction_status(scb, status: CAM_CMD_TIMEOUT);
1791
1792	if (ahc->platform_data->eh_done)
1793	complete(ahc->platform_data->eh_done);
1794	}
1795
1796	ahc_free_scb(ahc, scb);
1797	ahc_linux_queue_cmd_complete(ahc, cmd);
1798	}
1799
1800	static void
1801	ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
1802	struct scsi_device *sdev, struct scb *scb)
1803	{
1804	struct ahc_devinfo devinfo;
1805	struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
1806
1807	ahc_compile_devinfo(devinfo: &devinfo,
1808	our_id: ahc->our_id,
1809	target: sdev->sdev_target->id, lun: sdev->lun,
1810	channel: sdev->sdev_target->channel == 0 ? 'A' : 'B',
1811	role: ROLE_INITIATOR);
1812
1813	/*
1814	* We don't currently trust the mid-layer to
1815	* properly deal with queue full or busy. So,
1816	* when one occurs, we tell the mid-layer to
1817	* unconditionally requeue the command to us
1818	* so that we can retry it ourselves. We also
1819	* implement our own throttling mechanism so
1820	* we don't clobber the device with too many
1821	* commands.
1822	*/
1823	switch (ahc_get_scsi_status(scb)) {
1824	default:
1825	break;
1826	case SAM_STAT_CHECK_CONDITION:
1827	case SAM_STAT_COMMAND_TERMINATED:
1828	{
1829	struct scsi_cmnd *cmd;
1830
1831	/*
1832	* Copy sense information to the OS's cmd
1833	* structure if it is available.
1834	*/
1835	cmd = scb->io_ctx;
1836	if (scb->flags & SCB_SENSE) {
1837	u_int sense_size;
1838
1839	sense_size = min(sizeof(struct scsi_sense_data)
1840	- ahc_get_sense_residual(scb),
1841	(u_long)SCSI_SENSE_BUFFERSIZE);
1842	memcpy(cmd->sense_buffer,
1843	ahc_get_sense_buf(ahc, scb), sense_size);
1844	if (sense_size < SCSI_SENSE_BUFFERSIZE)
1845	memset(&cmd->sense_buffer[sense_size], 0,
1846	SCSI_SENSE_BUFFERSIZE - sense_size);
1847	#ifdef AHC_DEBUG
1848	if (ahc_debug & AHC_SHOW_SENSE) {
1849	int i;
1850
1851	printk("Copied %d bytes of sense data:",
1852	sense_size);
1853	for (i = 0; i < sense_size; i++) {
1854	if ((i & 0xF) == 0)
1855	printk("\n");
1856	printk("0x%x ", cmd->sense_buffer[i]);
1857	}
1858	printk("\n");
1859	}
1860	#endif
1861	}
1862	break;
1863	}
1864	case SAM_STAT_TASK_SET_FULL:
1865	{
1866	/*
1867	* By the time the core driver has returned this
1868	* command, all other commands that were queued
1869	* to us but not the device have been returned.
1870	* This ensures that dev->active is equal to
1871	* the number of commands actually queued to
1872	* the device.
1873	*/
1874	dev->tag_success_count = 0;
1875	if (dev->active != 0) {
1876	/*
1877	* Drop our opening count to the number
1878	* of commands currently outstanding.
1879	*/
1880	dev->openings = 0;
1881	/*
1882	ahc_print_path(ahc, scb);
1883	printk("Dropping tag count to %d\n", dev->active);
1884	*/
1885	if (dev->active == dev->tags_on_last_queuefull) {
1886
1887	dev->last_queuefull_same_count++;
1888	/*
1889	* If we repeatedly see a queue full
1890	* at the same queue depth, this
1891	* device has a fixed number of tag
1892	* slots. Lock in this tag depth
1893	* so we stop seeing queue fulls from
1894	* this device.
1895	*/
1896	if (dev->last_queuefull_same_count
1897	== AHC_LOCK_TAGS_COUNT) {
1898	dev->maxtags = dev->active;
1899	ahc_print_path(ahc, scb);
1900	printk("Locking max tag count at %d\n",
1901	dev->active);
1902	}
1903	} else {
1904	dev->tags_on_last_queuefull = dev->active;
1905	dev->last_queuefull_same_count = 0;
1906	}
1907	ahc_set_transaction_status(scb, status: CAM_REQUEUE_REQ);
1908	ahc_set_scsi_status(scb, status: SAM_STAT_GOOD);
1909	ahc_platform_set_tags(ahc, sdev, devinfo: &devinfo,
1910	alg: (dev->flags & AHC_DEV_Q_BASIC)
1911	? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1912	break;
1913	}
1914	/*
1915	* Drop down to a single opening, and treat this
1916	* as if the target returned BUSY SCSI status.
1917	*/
1918	dev->openings = 1;
1919	ahc_set_scsi_status(scb, status: SAM_STAT_BUSY);
1920	ahc_platform_set_tags(ahc, sdev, devinfo: &devinfo,
1921	alg: (dev->flags & AHC_DEV_Q_BASIC)
1922	? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1923	break;
1924	}
1925	}
1926	}
1927
1928	static void
1929	ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
1930	{
1931	/*
1932	* Map CAM error codes into Linux Error codes. We
1933	* avoid the conversion so that the DV code has the
1934	* full error information available when making
1935	* state change decisions.
1936	*/
1937	{
1938	u_int new_status;
1939
1940	switch (ahc_cmd_get_transaction_status(cmd)) {
1941	case CAM_REQ_INPROG:
1942	case CAM_REQ_CMP:
1943	case CAM_SCSI_STATUS_ERROR:
1944	new_status = DID_OK;
1945	break;
1946	case CAM_REQ_ABORTED:
1947	new_status = DID_ABORT;
1948	break;
1949	case CAM_BUSY:
1950	new_status = DID_BUS_BUSY;
1951	break;
1952	case CAM_REQ_INVALID:
1953	case CAM_PATH_INVALID:
1954	new_status = DID_BAD_TARGET;
1955	break;
1956	case CAM_SEL_TIMEOUT:
1957	new_status = DID_NO_CONNECT;
1958	break;
1959	case CAM_SCSI_BUS_RESET:
1960	case CAM_BDR_SENT:
1961	new_status = DID_RESET;
1962	break;
1963	case CAM_UNCOR_PARITY:
1964	new_status = DID_PARITY;
1965	break;
1966	case CAM_CMD_TIMEOUT:
1967	new_status = DID_TIME_OUT;
1968	break;
1969	case CAM_UA_ABORT:
1970	case CAM_REQ_CMP_ERR:
1971	case CAM_AUTOSENSE_FAIL:
1972	case CAM_NO_HBA:
1973	case CAM_DATA_RUN_ERR:
1974	case CAM_UNEXP_BUSFREE:
1975	case CAM_SEQUENCE_FAIL:
1976	case CAM_CCB_LEN_ERR:
1977	case CAM_PROVIDE_FAIL:
1978	case CAM_REQ_TERMIO:
1979	case CAM_UNREC_HBA_ERROR:
1980	case CAM_REQ_TOO_BIG:
1981	new_status = DID_ERROR;
1982	break;
1983	case CAM_REQUEUE_REQ:
1984	new_status = DID_REQUEUE;
1985	break;
1986	default:
1987	/* We should never get here */
1988	new_status = DID_ERROR;
1989	break;
1990	}
1991
1992	ahc_cmd_set_transaction_status(cmd, status: new_status);
1993	}
1994
1995	scsi_done(cmd);
1996	}
1997
1998	static void
1999	ahc_linux_freeze_simq(struct ahc_softc *ahc)
2000	{
2001	unsigned long s;
2002
2003	ahc_lock(ahc, flags: &s);
2004	ahc->platform_data->qfrozen++;
2005	if (ahc->platform_data->qfrozen == 1) {
2006	scsi_block_requests(ahc->platform_data->host);
2007
2008	/* XXX What about Twin channels? */
2009	ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2010	CAM_LUN_WILDCARD, tag: SCB_LIST_NULL,
2011	role: ROLE_INITIATOR, status: CAM_REQUEUE_REQ);
2012	}
2013	ahc_unlock(ahc, flags: &s);
2014	}
2015
2016	static void
2017	ahc_linux_release_simq(struct ahc_softc *ahc)
2018	{
2019	u_long s;
2020	int unblock_reqs;
2021
2022	unblock_reqs = 0;
2023	ahc_lock(ahc, flags: &s);
2024	if (ahc->platform_data->qfrozen > 0)
2025	ahc->platform_data->qfrozen--;
2026	if (ahc->platform_data->qfrozen == 0)
2027	unblock_reqs = 1;
2028	ahc_unlock(ahc, flags: &s);
2029	/*
2030	* There is still a race here. The mid-layer
2031	* should keep its own freeze count and use
2032	* a bottom half handler to run the queues
2033	* so we can unblock with our own lock held.
2034	*/
2035	if (unblock_reqs)
2036	scsi_unblock_requests(ahc->platform_data->host);
2037	}
2038
2039	static int
2040	ahc_linux_queue_recovery_cmd(struct scsi_device *sdev,
2041	struct scsi_cmnd *cmd)
2042	{
2043	struct ahc_softc *ahc;
2044	struct ahc_linux_device *dev;
2045	struct scb *pending_scb = NULL, *scb;
2046	u_int saved_scbptr;
2047	u_int active_scb_index;
2048	u_int last_phase;
2049	u_int saved_scsiid;
2050	u_int cdb_byte;
2051	int retval;
2052	int was_paused;
2053	int paused;
2054	int wait;
2055	int disconnected;
2056	unsigned long flags;
2057
2058	paused = FALSE;
2059	wait = FALSE;
2060	ahc = *(struct ahc_softc **)sdev->host->hostdata;
2061
2062	sdev_printk(KERN_INFO, sdev, "Attempting to queue a%s message\n",
2063	cmd ? "n ABORT" : " TARGET RESET");
2064
2065	if (cmd) {
2066	printk("CDB:");
2067	for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2068	printk(" 0x%x", cmd->cmnd[cdb_byte]);
2069	printk("\n");
2070	}
2071
2072	ahc_lock(ahc, flags: &flags);
2073
2074	/*
2075	* First determine if we currently own this command.
2076	* Start by searching the device queue. If not found
2077	* there, check the pending_scb list. If not found
2078	* at all, and the system wanted us to just abort the
2079	* command, return success.
2080	*/
2081	dev = scsi_transport_device_data(sdev);
2082
2083	if (dev == NULL) {
2084	/*
2085	* No target device for this command exists,
2086	* so we must not still own the command.
2087	*/
2088	printk("%s:%d:%d:%d: Is not an active device\n",
2089	ahc_name(ahc), sdev->channel, sdev->id, (u8)sdev->lun);
2090	retval = SUCCESS;
2091	goto no_cmd;
2092	}
2093
2094	if (cmd && (dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2095	&& ahc_search_untagged_queues(ahc, ctx: cmd, target: cmd->device->id,
2096	channel: cmd->device->channel + 'A',
2097	lun: (u8)cmd->device->lun,
2098	status: CAM_REQ_ABORTED, action: SEARCH_COMPLETE) != 0) {
2099	printk("%s:%d:%d:%d: Command found on untagged queue\n",
2100	ahc_name(ahc), cmd->device->channel, cmd->device->id,
2101	(u8)cmd->device->lun);
2102	retval = SUCCESS;
2103	goto done;
2104	}
2105
2106	/*
2107	* See if we can find a matching cmd in the pending list.
2108	*/
2109	if (cmd) {
2110	LIST_FOREACH(scb, &ahc->pending_scbs, pending_links) {
2111	if (scb->io_ctx == cmd) {
2112	pending_scb = scb;
2113	break;
2114	}
2115	}
2116	} else {
2117	/* Any SCB for this device will do for a target reset */
2118	LIST_FOREACH(scb, &ahc->pending_scbs, pending_links) {
2119	if (ahc_match_scb(ahc, scb, target: sdev->id,
2120	channel: sdev->channel + 'A',
2121	CAM_LUN_WILDCARD,
2122	tag: SCB_LIST_NULL, role: ROLE_INITIATOR)) {
2123	pending_scb = scb;
2124	break;
2125	}
2126	}
2127	}
2128
2129	if (pending_scb == NULL) {
2130	sdev_printk(KERN_INFO, sdev, "Command not found\n");
2131	goto no_cmd;
2132	}
2133
2134	if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2135	/*
2136	* We can't queue two recovery actions using the same SCB
2137	*/
2138	retval = FAILED;
2139	goto done;
2140	}
2141
2142	/*
2143	* Ensure that the card doesn't do anything
2144	* behind our back and that we didn't "just" miss
2145	* an interrupt that would affect this cmd.
2146	*/
2147	was_paused = ahc_is_paused(ahc);
2148	ahc_pause_and_flushwork(ahc);
2149	paused = TRUE;
2150
2151	if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2152	scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2153	goto no_cmd;
2154	}
2155
2156	printk("%s: At time of recovery, card was %spaused\n",
2157	ahc_name(ahc), was_paused ? "" : "not ");
2158	ahc_dump_card_state(ahc);
2159
2160	disconnected = TRUE;
2161	if (cmd) {
2162	if (ahc_search_qinfifo(ahc, target: sdev->id,
2163	channel: sdev->channel + 'A',
2164	lun: sdev->lun,
2165	tag: pending_scb->hscb->tag,
2166	role: ROLE_INITIATOR, status: CAM_REQ_ABORTED,
2167	action: SEARCH_COMPLETE) > 0) {
2168	printk("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2169	ahc_name(ahc), sdev->channel,
2170	sdev->id, (u8)sdev->lun);
2171	retval = SUCCESS;
2172	goto done;
2173	}
2174	} else if (ahc_search_qinfifo(ahc, target: sdev->id,
2175	channel: sdev->channel + 'A',
2176	lun: sdev->lun,
2177	tag: pending_scb->hscb->tag,
2178	role: ROLE_INITIATOR, /*status*/0,
2179	action: SEARCH_COUNT) > 0) {
2180	disconnected = FALSE;
2181	}
2182
2183	if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2184	struct scb *bus_scb;
2185
2186	bus_scb = ahc_lookup_scb(ahc, tag: ahc_inb(ahc, port: SCB_TAG));
2187	if (bus_scb == pending_scb)
2188	disconnected = FALSE;
2189	else if (!cmd
2190	&& ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2191	&& ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2192	disconnected = FALSE;
2193	}
2194
2195	/*
2196	* At this point, pending_scb is the scb associated with the
2197	* passed in command. That command is currently active on the
2198	* bus, is in the disconnected state, or we're hoping to find
2199	* a command for the same target active on the bus to abuse to
2200	* send a BDR. Queue the appropriate message based on which of
2201	* these states we are in.
2202	*/
2203	last_phase = ahc_inb(ahc, port: LASTPHASE);
2204	saved_scbptr = ahc_inb(ahc, port: SCBPTR);
2205	active_scb_index = ahc_inb(ahc, port: SCB_TAG);
2206	saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2207	if (last_phase != P_BUSFREE
2208	&& (pending_scb->hscb->tag == active_scb_index
2209	|| (!cmd && SCSIID_TARGET(ahc, saved_scsiid) == sdev->id))) {
2210
2211	/*
2212	* We're active on the bus, so assert ATN
2213	* and hope that the target responds.
2214	*/
2215	pending_scb = ahc_lookup_scb(ahc, tag: active_scb_index);
2216	pending_scb->flags |= SCB_RECOVERY_SCB;
2217	pending_scb->flags |= cmd ? SCB_ABORT : SCB_DEVICE_RESET;
2218	ahc_outb(ahc, MSG_OUT, HOST_MSG);
2219	ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2220	sdev_printk(KERN_INFO, sdev, "Device is active, asserting ATN\n");
2221	wait = TRUE;
2222	} else if (disconnected) {
2223
2224	/*
2225	* Actually re-queue this SCB in an attempt
2226	* to select the device before it reconnects.
2227	* In either case (selection or reselection),
2228	* we will now issue the approprate message
2229	* to the timed-out device.
2230	*
2231	* Set the MK_MESSAGE control bit indicating
2232	* that we desire to send a message. We
2233	* also set the disconnected flag since
2234	* in the paging case there is no guarantee
2235	* that our SCB control byte matches the
2236	* version on the card. We don't want the
2237	* sequencer to abort the command thinking
2238	* an unsolicited reselection occurred.
2239	*/
2240	pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2241	pending_scb->flags |= SCB_RECOVERY_SCB;
2242	pending_scb->flags |= cmd ? SCB_ABORT : SCB_DEVICE_RESET;
2243
2244	/*
2245	* Remove any cached copy of this SCB in the
2246	* disconnected list in preparation for the
2247	* queuing of our abort SCB. We use the
2248	* same element in the SCB, SCB_NEXT, for
2249	* both the qinfifo and the disconnected list.
2250	*/
2251	ahc_search_disc_list(ahc, target: sdev->id,
2252	channel: sdev->channel + 'A',
2253	lun: sdev->lun, tag: pending_scb->hscb->tag,
2254	/*stop_on_first*/TRUE,
2255	/*remove*/TRUE,
2256	/*save_state*/FALSE);
2257
2258	/*
2259	* In the non-paging case, the sequencer will
2260	* never re-reference the in-core SCB.
2261	* To make sure we are notified during
2262	* reselection, set the MK_MESSAGE flag in
2263	* the card's copy of the SCB.
2264	*/
2265	if ((ahc->flags & AHC_PAGESCBS) == 0) {
2266	ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2267	ahc_outb(ahc, SCB_CONTROL,
2268	ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2269	}
2270
2271	/*
2272	* Clear out any entries in the QINFIFO first
2273	* so we are the next SCB for this target
2274	* to run.
2275	*/
2276	ahc_search_qinfifo(ahc, sdev->id,
2277	sdev->channel + 'A',
2278	(u8)sdev->lun, SCB_LIST_NULL,
2279	ROLE_INITIATOR, CAM_REQUEUE_REQ,
2280	SEARCH_COMPLETE);
2281	ahc_qinfifo_requeue_tail(ahc, scb: pending_scb);
2282	ahc_outb(ahc, SCBPTR, saved_scbptr);
2283	ahc_print_path(ahc, scb: pending_scb);
2284	printk("Device is disconnected, re-queuing SCB\n");
2285	wait = TRUE;
2286	} else {
2287	sdev_printk(KERN_INFO, sdev, "Unable to deliver message\n");
2288	retval = FAILED;
2289	goto done;
2290	}
2291
2292	no_cmd:
2293	/*
2294	* Our assumption is that if we don't have the command, no
2295	* recovery action was required, so we return success. Again,
2296	* the semantics of the mid-layer recovery engine are not
2297	* well defined, so this may change in time.
2298	*/
2299	retval = SUCCESS;
2300	done:
2301	if (paused)
2302	ahc_unpause(ahc);
2303	if (wait) {
2304	DECLARE_COMPLETION_ONSTACK(done);
2305
2306	ahc->platform_data->eh_done = &done;
2307	ahc_unlock(ahc, flags: &flags);
2308
2309	printk("Recovery code sleeping\n");
2310	if (!wait_for_completion_timeout(x: &done, timeout: 5 * HZ)) {
2311	ahc_lock(ahc, flags: &flags);
2312	ahc->platform_data->eh_done = NULL;
2313	ahc_unlock(ahc, flags: &flags);
2314
2315	printk("Timer Expired\n");
2316	retval = FAILED;
2317	}
2318	printk("Recovery code awake\n");
2319	} else
2320	ahc_unlock(ahc, flags: &flags);
2321	return (retval);
2322	}
2323
2324	static void ahc_linux_set_width(struct scsi_target *starget, int width)
2325	{
2326	struct Scsi_Host *shost = dev_to_shost(dev: starget->dev.parent);
2327	struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2328	struct ahc_devinfo devinfo;
2329	unsigned long flags;
2330
2331	ahc_compile_devinfo(devinfo: &devinfo, our_id: shost->this_id, target: starget->id, lun: 0,
2332	channel: starget->channel + 'A', role: ROLE_INITIATOR);
2333	ahc_lock(ahc, flags: &flags);
2334	ahc_set_width(ahc, devinfo: &devinfo, width, AHC_TRANS_GOAL, FALSE);
2335	ahc_unlock(ahc, flags: &flags);
2336	}
2337
2338	static void ahc_linux_set_period(struct scsi_target *starget, int period)
2339	{
2340	struct Scsi_Host *shost = dev_to_shost(dev: starget->dev.parent);
2341	struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2342	struct ahc_tmode_tstate *tstate;
2343	struct ahc_initiator_tinfo *tinfo
2344	= ahc_fetch_transinfo(ahc,
2345	channel: starget->channel + 'A',
2346	our_id: shost->this_id, remote_id: starget->id, tstate: &tstate);
2347	struct ahc_devinfo devinfo;
2348	unsigned int ppr_options = tinfo->goal.ppr_options;
2349	unsigned long flags;
2350	unsigned long offset = tinfo->goal.offset;
2351	const struct ahc_syncrate *syncrate;
2352
2353	if (offset == 0)
2354	offset = MAX_OFFSET;
2355
2356	if (period < 9)
2357	period = 9; /* 12.5ns is our minimum */
2358	if (period == 9) {
2359	if (spi_max_width(starget))
2360	ppr_options |= MSG_EXT_PPR_DT_REQ;
2361	else
2362	/* need wide for DT and need DT for 12.5 ns */
2363	period = 10;
2364	}
2365
2366	ahc_compile_devinfo(devinfo: &devinfo, our_id: shost->this_id, target: starget->id, lun: 0,
2367	channel: starget->channel + 'A', role: ROLE_INITIATOR);
2368
2369	/* all PPR requests apart from QAS require wide transfers */
2370	if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2371	if (spi_width(starget) == 0)
2372	ppr_options &= MSG_EXT_PPR_QAS_REQ;
2373	}
2374
2375	syncrate = ahc_find_syncrate(ahc, period: &period, ppr_options: &ppr_options,
2376	AHC_SYNCRATE_DT);
2377	ahc_lock(ahc, flags: &flags);
2378	ahc_set_syncrate(ahc, devinfo: &devinfo, syncrate, period, offset,
2379	ppr_options, AHC_TRANS_GOAL, FALSE);
2380	ahc_unlock(ahc, flags: &flags);
2381	}
2382
2383	static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2384	{
2385	struct Scsi_Host *shost = dev_to_shost(dev: starget->dev.parent);
2386	struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2387	struct ahc_tmode_tstate *tstate;
2388	struct ahc_initiator_tinfo *tinfo
2389	= ahc_fetch_transinfo(ahc,
2390	channel: starget->channel + 'A',
2391	our_id: shost->this_id, remote_id: starget->id, tstate: &tstate);
2392	struct ahc_devinfo devinfo;
2393	unsigned int ppr_options = 0;
2394	unsigned int period = 0;
2395	unsigned long flags;
2396	const struct ahc_syncrate *syncrate = NULL;
2397
2398	ahc_compile_devinfo(devinfo: &devinfo, our_id: shost->this_id, target: starget->id, lun: 0,
2399	channel: starget->channel + 'A', role: ROLE_INITIATOR);
2400	if (offset != 0) {
2401	syncrate = ahc_find_syncrate(ahc, period: &period, ppr_options: &ppr_options,
2402	AHC_SYNCRATE_DT);
2403	period = tinfo->goal.period;
2404	ppr_options = tinfo->goal.ppr_options;
2405	}
2406	ahc_lock(ahc, flags: &flags);
2407	ahc_set_syncrate(ahc, devinfo: &devinfo, syncrate, period, offset,
2408	ppr_options, AHC_TRANS_GOAL, FALSE);
2409	ahc_unlock(ahc, flags: &flags);
2410	}
2411
2412	static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2413	{
2414	struct Scsi_Host *shost = dev_to_shost(dev: starget->dev.parent);
2415	struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2416	struct ahc_tmode_tstate *tstate;
2417	struct ahc_initiator_tinfo *tinfo
2418	= ahc_fetch_transinfo(ahc,
2419	channel: starget->channel + 'A',
2420	our_id: shost->this_id, remote_id: starget->id, tstate: &tstate);
2421	struct ahc_devinfo devinfo;
2422	unsigned int ppr_options = tinfo->goal.ppr_options
2423	& ~MSG_EXT_PPR_DT_REQ;
2424	unsigned int period = tinfo->goal.period;
2425	unsigned int width = tinfo->goal.width;
2426	unsigned long flags;
2427	const struct ahc_syncrate *syncrate;
2428
2429	if (dt && spi_max_width(starget)) {
2430	ppr_options |= MSG_EXT_PPR_DT_REQ;
2431	if (!width)
2432	ahc_linux_set_width(starget, width: 1);
2433	} else if (period == 9)
2434	period = 10; /* if resetting DT, period must be >= 25ns */
2435
2436	ahc_compile_devinfo(devinfo: &devinfo, our_id: shost->this_id, target: starget->id, lun: 0,
2437	channel: starget->channel + 'A', role: ROLE_INITIATOR);
2438	syncrate = ahc_find_syncrate(ahc, period: &period, ppr_options: &ppr_options,
2439	AHC_SYNCRATE_DT);
2440	ahc_lock(ahc, flags: &flags);
2441	ahc_set_syncrate(ahc, devinfo: &devinfo, syncrate, period, offset: tinfo->goal.offset,
2442	ppr_options, AHC_TRANS_GOAL, FALSE);
2443	ahc_unlock(ahc, flags: &flags);
2444	}
2445
2446	#if 0
2447	/* FIXME: This code claims to support IU and QAS. However, the actual
2448	* sequencer code and aic7xxx_core have no support for these parameters and
2449	* will get into a bad state if they're negotiated. Do not enable this
2450	* unless you know what you're doing */
2451	static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2452	{
2453	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2454	struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2455	struct ahc_tmode_tstate *tstate;
2456	struct ahc_initiator_tinfo *tinfo
2457	= ahc_fetch_transinfo(ahc,
2458	starget->channel + 'A',
2459	shost->this_id, starget->id, &tstate);
2460	struct ahc_devinfo devinfo;
2461	unsigned int ppr_options = tinfo->goal.ppr_options
2462	& ~MSG_EXT_PPR_QAS_REQ;
2463	unsigned int period = tinfo->goal.period;
2464	unsigned long flags;
2465	struct ahc_syncrate *syncrate;
2466
2467	if (qas)
2468	ppr_options |= MSG_EXT_PPR_QAS_REQ;
2469
2470	ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2471	starget->channel + 'A', ROLE_INITIATOR);
2472	syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,
2473	AHC_SYNCRATE_DT);
2474	ahc_lock(ahc, &flags);
2475	ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2476	ppr_options, AHC_TRANS_GOAL, FALSE);
2477	ahc_unlock(ahc, &flags);
2478	}
2479
2480	static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2481	{
2482	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2483	struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2484	struct ahc_tmode_tstate *tstate;
2485	struct ahc_initiator_tinfo *tinfo
2486	= ahc_fetch_transinfo(ahc,
2487	starget->channel + 'A',
2488	shost->this_id, starget->id, &tstate);
2489	struct ahc_devinfo devinfo;
2490	unsigned int ppr_options = tinfo->goal.ppr_options
2491	& ~MSG_EXT_PPR_IU_REQ;
2492	unsigned int period = tinfo->goal.period;
2493	unsigned long flags;
2494	struct ahc_syncrate *syncrate;
2495
2496	if (iu)
2497	ppr_options |= MSG_EXT_PPR_IU_REQ;
2498
2499	ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2500	starget->channel + 'A', ROLE_INITIATOR);
2501	syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,
2502	AHC_SYNCRATE_DT);
2503	ahc_lock(ahc, &flags);
2504	ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2505	ppr_options, AHC_TRANS_GOAL, FALSE);
2506	ahc_unlock(ahc, &flags);
2507	}
2508	#endif
2509
2510	static void ahc_linux_get_signalling(struct Scsi_Host *shost)
2511	{
2512	struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
2513	unsigned long flags;
2514	u8 mode;
2515
2516	if (!(ahc->features & AHC_ULTRA2)) {
2517	/* non-LVD chipset, may not have SBLKCTL reg */
2518	spi_signalling(shost) =
2519	ahc->features & AHC_HVD ?
2520	SPI_SIGNAL_HVD :
2521	SPI_SIGNAL_SE;
2522	return;
2523	}
2524
2525	ahc_lock(ahc, flags: &flags);
2526	ahc_pause(ahc);
2527	mode = ahc_inb(ahc, SBLKCTL);
2528	ahc_unpause(ahc);
2529	ahc_unlock(ahc, flags: &flags);
2530
2531	if (mode & ENAB40)
2532	spi_signalling(shost) = SPI_SIGNAL_LVD;
2533	else if (mode & ENAB20)
2534	spi_signalling(shost) = SPI_SIGNAL_SE;
2535	else
2536	spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
2537	}
2538
2539	static struct spi_function_template ahc_linux_transport_functions = {
2540	.set_offset = ahc_linux_set_offset,
2541	.show_offset = 1,
2542	.set_period = ahc_linux_set_period,
2543	.show_period = 1,
2544	.set_width = ahc_linux_set_width,
2545	.show_width = 1,
2546	.set_dt = ahc_linux_set_dt,
2547	.show_dt = 1,
2548	#if 0
2549	.set_iu = ahc_linux_set_iu,
2550	.show_iu = 1,
2551	.set_qas = ahc_linux_set_qas,
2552	.show_qas = 1,
2553	#endif
2554	.get_signalling = ahc_linux_get_signalling,
2555	};
2556
2557
2558
2559	static int __init
2560	ahc_linux_init(void)
2561	{
2562	/*
2563	* If we've been passed any parameters, process them now.
2564	*/
2565	if (aic7xxx)
2566	aic7xxx_setup(s: aic7xxx);
2567
2568	ahc_linux_transport_template =
2569	spi_attach_transport(&ahc_linux_transport_functions);
2570	if (!ahc_linux_transport_template)
2571	return -ENODEV;
2572
2573	scsi_transport_reserve_device(t: ahc_linux_transport_template,
2574	space: sizeof(struct ahc_linux_device));
2575
2576	ahc_linux_pci_init();
2577	ahc_linux_eisa_init();
2578	return 0;
2579	}
2580
2581	static void
2582	ahc_linux_exit(void)
2583	{
2584	ahc_linux_pci_exit();
2585	ahc_linux_eisa_exit();
2586	spi_release_transport(ahc_linux_transport_template);
2587	}
2588
2589	module_init(ahc_linux_init);
2590	module_exit(ahc_linux_exit);
2591