xref: /openbmc/linux/drivers/scsi/aic7xxx/aic7xxx.h (revision c2f23a96)
1 /*
2  * Core definitions and data structures shareable across OS platforms.
3  *
4  * Copyright (c) 1994-2001 Justin T. Gibbs.
5  * Copyright (c) 2000-2001 Adaptec Inc.
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions, and the following disclaimer,
13  *    without modification.
14  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
15  *    substantially similar to the "NO WARRANTY" disclaimer below
16  *    ("Disclaimer") and any redistribution must be conditioned upon
17  *    including a substantially similar Disclaimer requirement for further
18  *    binary redistribution.
19  * 3. Neither the names of the above-listed copyright holders nor the names
20  *    of any contributors may be used to endorse or promote products derived
21  *    from this software without specific prior written permission.
22  *
23  * Alternatively, this software may be distributed under the terms of the
24  * GNU General Public License ("GPL") version 2 as published by the Free
25  * Software Foundation.
26  *
27  * NO WARRANTY
28  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
31  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
36  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
37  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
38  * POSSIBILITY OF SUCH DAMAGES.
39  *
40  * $Id: //depot/aic7xxx/aic7xxx/aic7xxx.h#85 $
41  *
42  * $FreeBSD$
43  */
44 
45 #ifndef _AIC7XXX_H_
46 #define _AIC7XXX_H_
47 
48 /* Register Definitions */
49 #include "aic7xxx_reg.h"
50 
51 /************************* Forward Declarations *******************************/
52 struct ahc_platform_data;
53 struct scb_platform_data;
54 struct seeprom_descriptor;
55 
56 /****************************** Useful Macros *********************************/
57 #ifndef TRUE
58 #define TRUE 1
59 #endif
60 #ifndef FALSE
61 #define FALSE 0
62 #endif
63 
64 #define ALL_CHANNELS '\0'
65 #define ALL_TARGETS_MASK 0xFFFF
66 #define INITIATOR_WILDCARD	(~0)
67 
68 #define SCSIID_TARGET(ahc, scsiid) \
69 	(((scsiid) & ((((ahc)->features & AHC_TWIN) != 0) ? TWIN_TID : TID)) \
70 	>> TID_SHIFT)
71 #define SCSIID_OUR_ID(scsiid) \
72 	((scsiid) & OID)
73 #define SCSIID_CHANNEL(ahc, scsiid) \
74 	((((ahc)->features & AHC_TWIN) != 0) \
75         ? ((((scsiid) & TWIN_CHNLB) != 0) ? 'B' : 'A') \
76        : 'A')
77 #define	SCB_IS_SCSIBUS_B(ahc, scb) \
78 	(SCSIID_CHANNEL(ahc, (scb)->hscb->scsiid) == 'B')
79 #define	SCB_GET_OUR_ID(scb) \
80 	SCSIID_OUR_ID((scb)->hscb->scsiid)
81 #define	SCB_GET_TARGET(ahc, scb) \
82 	SCSIID_TARGET((ahc), (scb)->hscb->scsiid)
83 #define	SCB_GET_CHANNEL(ahc, scb) \
84 	SCSIID_CHANNEL(ahc, (scb)->hscb->scsiid)
85 #define	SCB_GET_LUN(scb) \
86 	((scb)->hscb->lun & LID)
87 #define SCB_GET_TARGET_OFFSET(ahc, scb)	\
88 	(SCB_GET_TARGET(ahc, scb) + (SCB_IS_SCSIBUS_B(ahc, scb) ? 8 : 0))
89 #define SCB_GET_TARGET_MASK(ahc, scb) \
90 	(0x01 << (SCB_GET_TARGET_OFFSET(ahc, scb)))
91 #ifdef AHC_DEBUG
92 #define SCB_IS_SILENT(scb)					\
93 	((ahc_debug & AHC_SHOW_MASKED_ERRORS) == 0		\
94       && (((scb)->flags & SCB_SILENT) != 0))
95 #else
96 #define SCB_IS_SILENT(scb)					\
97 	(((scb)->flags & SCB_SILENT) != 0)
98 #endif
99 #define TCL_TARGET_OFFSET(tcl) \
100 	((((tcl) >> 4) & TID) >> 4)
101 #define TCL_LUN(tcl) \
102 	(tcl & (AHC_NUM_LUNS - 1))
103 #define BUILD_TCL(scsiid, lun) \
104 	((lun) | (((scsiid) & TID) << 4))
105 
106 #ifndef	AHC_TARGET_MODE
107 #undef	AHC_TMODE_ENABLE
108 #define	AHC_TMODE_ENABLE 0
109 #endif
110 
111 /**************************** Driver Constants ********************************/
112 /*
113  * The maximum number of supported targets.
114  */
115 #define AHC_NUM_TARGETS 16
116 
117 /*
118  * The maximum number of supported luns.
119  * The identify message only supports 64 luns in SPI3.
120  * You can have 2^64 luns when information unit transfers are enabled,
121  * but it is doubtful this driver will ever support IUTs.
122  */
123 #define AHC_NUM_LUNS 64
124 
125 /*
126  * The maximum transfer per S/G segment.
127  */
128 #define AHC_MAXTRANSFER_SIZE	 0x00ffffff	/* limited by 24bit counter */
129 
130 /*
131  * The maximum amount of SCB storage in hardware on a controller.
132  * This value represents an upper bound.  Controllers vary in the number
133  * they actually support.
134  */
135 #define AHC_SCB_MAX	255
136 
137 /*
138  * The maximum number of concurrent transactions supported per driver instance.
139  * Sequencer Control Blocks (SCBs) store per-transaction information.  Although
140  * the space for SCBs on the host adapter varies by model, the driver will
141  * page the SCBs between host and controller memory as needed.  We are limited
142  * to 253 because:
143  * 	1) The 8bit nature of the RISC engine holds us to an 8bit value.
144  * 	2) We reserve one value, 255, to represent the invalid element.
145  *	3) Our input queue scheme requires one SCB to always be reserved
146  *	   in advance of queuing any SCBs.  This takes us down to 254.
147  *	4) To handle our output queue correctly on machines that only
148  * 	   support 32bit stores, we must clear the array 4 bytes at a
149  *	   time.  To avoid colliding with a DMA write from the sequencer,
150  *	   we must be sure that 4 slots are empty when we write to clear
151  *	   the queue.  This reduces us to 253 SCBs: 1 that just completed
152  *	   and the known three additional empty slots in the queue that
153  *	   precede it.
154  */
155 #define AHC_MAX_QUEUE	253
156 
157 /*
158  * The maximum amount of SCB storage we allocate in host memory.  This
159  * number should reflect the 1 additional SCB we require to handle our
160  * qinfifo mechanism.
161  */
162 #define AHC_SCB_MAX_ALLOC (AHC_MAX_QUEUE+1)
163 
164 /*
165  * Ring Buffer of incoming target commands.
166  * We allocate 256 to simplify the logic in the sequencer
167  * by using the natural wrap point of an 8bit counter.
168  */
169 #define AHC_TMODE_CMDS	256
170 
171 /* Reset line assertion time in us */
172 #define AHC_BUSRESET_DELAY	25
173 
174 /******************* Chip Characteristics/Operating Settings  *****************/
175 /*
176  * Chip Type
177  * The chip order is from least sophisticated to most sophisticated.
178  */
179 typedef enum {
180 	AHC_NONE	= 0x0000,
181 	AHC_CHIPID_MASK	= 0x00FF,
182 	AHC_AIC7770	= 0x0001,
183 	AHC_AIC7850	= 0x0002,
184 	AHC_AIC7855	= 0x0003,
185 	AHC_AIC7859	= 0x0004,
186 	AHC_AIC7860	= 0x0005,
187 	AHC_AIC7870	= 0x0006,
188 	AHC_AIC7880	= 0x0007,
189 	AHC_AIC7895	= 0x0008,
190 	AHC_AIC7895C	= 0x0009,
191 	AHC_AIC7890	= 0x000a,
192 	AHC_AIC7896	= 0x000b,
193 	AHC_AIC7892	= 0x000c,
194 	AHC_AIC7899	= 0x000d,
195 	AHC_VL		= 0x0100,	/* Bus type VL */
196 	AHC_EISA	= 0x0200,	/* Bus type EISA */
197 	AHC_PCI		= 0x0400,	/* Bus type PCI */
198 	AHC_BUS_MASK	= 0x0F00
199 } ahc_chip;
200 
201 /*
202  * Features available in each chip type.
203  */
204 typedef enum {
205 	AHC_FENONE	= 0x00000,
206 	AHC_ULTRA	= 0x00001,	/* Supports 20MHz Transfers */
207 	AHC_ULTRA2	= 0x00002,	/* Supports 40MHz Transfers */
208 	AHC_WIDE  	= 0x00004,	/* Wide Channel */
209 	AHC_TWIN	= 0x00008,	/* Twin Channel */
210 	AHC_MORE_SRAM	= 0x00010,	/* 80 bytes instead of 64 */
211 	AHC_CMD_CHAN	= 0x00020,	/* Has a Command DMA Channel */
212 	AHC_QUEUE_REGS	= 0x00040,	/* Has Queue management registers */
213 	AHC_SG_PRELOAD	= 0x00080,	/* Can perform auto-SG preload */
214 	AHC_SPIOCAP	= 0x00100,	/* Has a Serial Port I/O Cap Register */
215 	AHC_MULTI_TID	= 0x00200,	/* Has bitmask of TIDs for select-in */
216 	AHC_HS_MAILBOX	= 0x00400,	/* Has HS_MAILBOX register */
217 	AHC_DT		= 0x00800,	/* Double Transition transfers */
218 	AHC_NEW_TERMCTL	= 0x01000,	/* Newer termination scheme */
219 	AHC_MULTI_FUNC	= 0x02000,	/* Multi-Function Twin Channel Device */
220 	AHC_LARGE_SCBS	= 0x04000,	/* 64byte SCBs */
221 	AHC_AUTORATE	= 0x08000,	/* Automatic update of SCSIRATE/OFFSET*/
222 	AHC_AUTOPAUSE	= 0x10000,	/* Automatic pause on register access */
223 	AHC_TARGETMODE	= 0x20000,	/* Has tested target mode support */
224 	AHC_MULTIROLE	= 0x40000,	/* Space for two roles at a time */
225 	AHC_REMOVABLE	= 0x80000,	/* Hot-Swap supported */
226 	AHC_HVD		= 0x100000,	/* HVD rather than SE */
227 	AHC_AIC7770_FE	= AHC_FENONE,
228 	/*
229 	 * The real 7850 does not support Ultra modes, but there are
230 	 * several cards that use the generic 7850 PCI ID even though
231 	 * they are using an Ultra capable chip (7859/7860).  We start
232 	 * out with the AHC_ULTRA feature set and then check the DEVSTATUS
233 	 * register to determine if the capability is really present.
234 	 */
235 	AHC_AIC7850_FE	= AHC_SPIOCAP|AHC_AUTOPAUSE|AHC_TARGETMODE|AHC_ULTRA,
236 	AHC_AIC7860_FE	= AHC_AIC7850_FE,
237 	AHC_AIC7870_FE	= AHC_TARGETMODE|AHC_AUTOPAUSE,
238 	AHC_AIC7880_FE	= AHC_AIC7870_FE|AHC_ULTRA,
239 	/*
240 	 * Although we have space for both the initiator and
241 	 * target roles on ULTRA2 chips, we currently disable
242 	 * the initiator role to allow multi-scsi-id target mode
243 	 * configurations.  We can only respond on the same SCSI
244 	 * ID as our initiator role if we allow initiator operation.
245 	 * At some point, we should add a configuration knob to
246 	 * allow both roles to be loaded.
247 	 */
248 	AHC_AIC7890_FE	= AHC_MORE_SRAM|AHC_CMD_CHAN|AHC_ULTRA2
249 			  |AHC_QUEUE_REGS|AHC_SG_PRELOAD|AHC_MULTI_TID
250 			  |AHC_HS_MAILBOX|AHC_NEW_TERMCTL|AHC_LARGE_SCBS
251 			  |AHC_TARGETMODE,
252 	AHC_AIC7892_FE	= AHC_AIC7890_FE|AHC_DT|AHC_AUTORATE|AHC_AUTOPAUSE,
253 	AHC_AIC7895_FE	= AHC_AIC7880_FE|AHC_MORE_SRAM|AHC_AUTOPAUSE
254 			  |AHC_CMD_CHAN|AHC_MULTI_FUNC|AHC_LARGE_SCBS,
255 	AHC_AIC7895C_FE	= AHC_AIC7895_FE|AHC_MULTI_TID,
256 	AHC_AIC7896_FE	= AHC_AIC7890_FE|AHC_MULTI_FUNC,
257 	AHC_AIC7899_FE	= AHC_AIC7892_FE|AHC_MULTI_FUNC
258 } ahc_feature;
259 
260 /*
261  * Bugs in the silicon that we work around in software.
262  */
263 typedef enum {
264 	AHC_BUGNONE		= 0x00,
265 	/*
266 	 * On all chips prior to the U2 product line,
267 	 * the WIDEODD S/G segment feature does not
268 	 * work during scsi->HostBus transfers.
269 	 */
270 	AHC_TMODE_WIDEODD_BUG	= 0x01,
271 	/*
272 	 * On the aic7890/91 Rev 0 chips, the autoflush
273 	 * feature does not work.  A manual flush of
274 	 * the DMA FIFO is required.
275 	 */
276 	AHC_AUTOFLUSH_BUG	= 0x02,
277 	/*
278 	 * On many chips, cacheline streaming does not work.
279 	 */
280 	AHC_CACHETHEN_BUG	= 0x04,
281 	/*
282 	 * On the aic7896/97 chips, cacheline
283 	 * streaming must be enabled.
284 	 */
285 	AHC_CACHETHEN_DIS_BUG	= 0x08,
286 	/*
287 	 * PCI 2.1 Retry failure on non-empty data fifo.
288 	 */
289 	AHC_PCI_2_1_RETRY_BUG	= 0x10,
290 	/*
291 	 * Controller does not handle cacheline residuals
292 	 * properly on S/G segments if PCI MWI instructions
293 	 * are allowed.
294 	 */
295 	AHC_PCI_MWI_BUG		= 0x20,
296 	/*
297 	 * An SCB upload using the SCB channel's
298 	 * auto array entry copy feature may
299 	 * corrupt data.  This appears to only
300 	 * occur on 66MHz systems.
301 	 */
302 	AHC_SCBCHAN_UPLOAD_BUG	= 0x40
303 } ahc_bug;
304 
305 /*
306  * Configuration specific settings.
307  * The driver determines these settings by probing the
308  * chip/controller's configuration.
309  */
310 typedef enum {
311 	AHC_FNONE	      = 0x000,
312 	AHC_PRIMARY_CHANNEL   = 0x003,  /*
313 					 * The channel that should
314 					 * be probed first.
315 					 */
316 	AHC_USEDEFAULTS	      = 0x004,  /*
317 					 * For cards without an seeprom
318 					 * or a BIOS to initialize the chip's
319 					 * SRAM, we use the default target
320 					 * settings.
321 					 */
322 	AHC_SEQUENCER_DEBUG   = 0x008,
323 	AHC_SHARED_SRAM	      = 0x010,
324 	AHC_LARGE_SEEPROM     = 0x020,  /* Uses C56_66 not C46 */
325 	AHC_RESET_BUS_A	      = 0x040,
326 	AHC_RESET_BUS_B	      = 0x080,
327 	AHC_EXTENDED_TRANS_A  = 0x100,
328 	AHC_EXTENDED_TRANS_B  = 0x200,
329 	AHC_TERM_ENB_A	      = 0x400,
330 	AHC_TERM_ENB_B	      = 0x800,
331 	AHC_INITIATORROLE     = 0x1000,  /*
332 					  * Allow initiator operations on
333 					  * this controller.
334 					  */
335 	AHC_TARGETROLE	      = 0x2000,  /*
336 					  * Allow target operations on this
337 					  * controller.
338 					  */
339 	AHC_NEWEEPROM_FMT     = 0x4000,
340 	AHC_TQINFIFO_BLOCKED  = 0x10000,  /* Blocked waiting for ATIOs */
341 	AHC_INT50_SPEEDFLEX   = 0x20000,  /*
342 					   * Internal 50pin connector
343 					   * sits behind an aic3860
344 					   */
345 	AHC_SCB_BTT	      = 0x40000,  /*
346 					   * The busy targets table is
347 					   * stored in SCB space rather
348 					   * than SRAM.
349 					   */
350 	AHC_BIOS_ENABLED      = 0x80000,
351 	AHC_ALL_INTERRUPTS    = 0x100000,
352 	AHC_PAGESCBS	      = 0x400000,  /* Enable SCB paging */
353 	AHC_EDGE_INTERRUPT    = 0x800000,  /* Device uses edge triggered ints */
354 	AHC_39BIT_ADDRESSING  = 0x1000000, /* Use 39 bit addressing scheme. */
355 	AHC_LSCBS_ENABLED     = 0x2000000, /* 64Byte SCBs enabled */
356 	AHC_SCB_CONFIG_USED   = 0x4000000, /* No SEEPROM but SCB2 had info. */
357 	AHC_NO_BIOS_INIT      = 0x8000000, /* No BIOS left over settings. */
358 	AHC_DISABLE_PCI_PERR  = 0x10000000,
359 	AHC_HAS_TERM_LOGIC    = 0x20000000
360 } ahc_flag;
361 
362 /************************* Hardware  SCB Definition ***************************/
363 
364 /*
365  * The driver keeps up to MAX_SCB scb structures per card in memory.  The SCB
366  * consists of a "hardware SCB" mirroring the fields available on the card
367  * and additional information the kernel stores for each transaction.
368  *
369  * To minimize space utilization, a portion of the hardware scb stores
370  * different data during different portions of a SCSI transaction.
371  * As initialized by the host driver for the initiator role, this area
372  * contains the SCSI cdb (or a pointer to the  cdb) to be executed.  After
373  * the cdb has been presented to the target, this area serves to store
374  * residual transfer information and the SCSI status byte.
375  * For the target role, the contents of this area do not change, but
376  * still serve a different purpose than for the initiator role.  See
377  * struct target_data for details.
378  */
379 
380 /*
381  * Status information embedded in the shared poriton of
382  * an SCB after passing the cdb to the target.  The kernel
383  * driver will only read this data for transactions that
384  * complete abnormally (non-zero status byte).
385  */
386 struct status_pkt {
387 	uint32_t residual_datacnt;	/* Residual in the current S/G seg */
388 	uint32_t residual_sg_ptr;	/* The next S/G for this transfer */
389 	uint8_t	 scsi_status;		/* Standard SCSI status byte */
390 };
391 
392 /*
393  * Target mode version of the shared data SCB segment.
394  */
395 struct target_data {
396 	uint32_t residual_datacnt;	/* Residual in the current S/G seg */
397 	uint32_t residual_sg_ptr;	/* The next S/G for this transfer */
398 	uint8_t  scsi_status;		/* SCSI status to give to initiator */
399 	uint8_t  target_phases;		/* Bitmap of phases to execute */
400 	uint8_t  data_phase;		/* Data-In or Data-Out */
401 	uint8_t  initiator_tag;		/* Initiator's transaction tag */
402 };
403 
404 struct hardware_scb {
405 /*0*/	union {
406 		/*
407 		 * If the cdb is 12 bytes or less, we embed it directly
408 		 * in the SCB.  For longer cdbs, we embed the address
409 		 * of the cdb payload as seen by the chip and a DMA
410 		 * is used to pull it in.
411 		 */
412 		uint8_t	 cdb[12];
413 		uint32_t cdb_ptr;
414 		struct	 status_pkt status;
415 		struct	 target_data tdata;
416 	} shared_data;
417 /*
418  * A word about residuals.
419  * The scb is presented to the sequencer with the dataptr and datacnt
420  * fields initialized to the contents of the first S/G element to
421  * transfer.  The sgptr field is initialized to the bus address for
422  * the S/G element that follows the first in the in core S/G array
423  * or'ed with the SG_FULL_RESID flag.  Sgptr may point to an invalid
424  * S/G entry for this transfer (single S/G element transfer with the
425  * first elements address and length preloaded in the dataptr/datacnt
426  * fields).  If no transfer is to occur, sgptr is set to SG_LIST_NULL.
427  * The SG_FULL_RESID flag ensures that the residual will be correctly
428  * noted even if no data transfers occur.  Once the data phase is entered,
429  * the residual sgptr and datacnt are loaded from the sgptr and the
430  * datacnt fields.  After each S/G element's dataptr and length are
431  * loaded into the hardware, the residual sgptr is advanced.  After
432  * each S/G element is expired, its datacnt field is checked to see
433  * if the LAST_SEG flag is set.  If so, SG_LIST_NULL is set in the
434  * residual sg ptr and the transfer is considered complete.  If the
435  * sequencer determines that there is a residual in the tranfer, it
436  * will set the SG_RESID_VALID flag in sgptr and dma the scb back into
437  * host memory.  To sumarize:
438  *
439  * Sequencer:
440  *	o A residual has occurred if SG_FULL_RESID is set in sgptr,
441  *	  or residual_sgptr does not have SG_LIST_NULL set.
442  *
443  *	o We are transferring the last segment if residual_datacnt has
444  *	  the SG_LAST_SEG flag set.
445  *
446  * Host:
447  *	o A residual has occurred if a completed scb has the
448  *	  SG_RESID_VALID flag set.
449  *
450  *	o residual_sgptr and sgptr refer to the "next" sg entry
451  *	  and so may point beyond the last valid sg entry for the
452  *	  transfer.
453  */
454 /*12*/	uint32_t dataptr;
455 /*16*/	uint32_t datacnt;		/*
456 					 * Byte 3 (numbered from 0) of
457 					 * the datacnt is really the
458 					 * 4th byte in that data address.
459 					 */
460 /*20*/	uint32_t sgptr;
461 #define SG_PTR_MASK	0xFFFFFFF8
462 /*24*/	uint8_t  control;	/* See SCB_CONTROL in aic7xxx.reg for details */
463 /*25*/	uint8_t  scsiid;	/* what to load in the SCSIID register */
464 /*26*/	uint8_t  lun;
465 /*27*/	uint8_t  tag;			/*
466 					 * Index into our kernel SCB array.
467 					 * Also used as the tag for tagged I/O
468 					 */
469 /*28*/	uint8_t  cdb_len;
470 /*29*/	uint8_t  scsirate;		/* Value for SCSIRATE register */
471 /*30*/	uint8_t  scsioffset;		/* Value for SCSIOFFSET register */
472 /*31*/	uint8_t  next;			/*
473 					 * Used for threading SCBs in the
474 					 * "Waiting for Selection" and
475 					 * "Disconnected SCB" lists down
476 					 * in the sequencer.
477 					 */
478 /*32*/	uint8_t  cdb32[32];		/*
479 					 * CDB storage for cdbs of size
480 					 * 13->32.  We store them here
481 					 * because hardware scbs are
482 					 * allocated from DMA safe
483 					 * memory so we are guaranteed
484 					 * the controller can access
485 					 * this data.
486 					 */
487 };
488 
489 /************************ Kernel SCB Definitions ******************************/
490 /*
491  * Some fields of the SCB are OS dependent.  Here we collect the
492  * definitions for elements that all OS platforms need to include
493  * in there SCB definition.
494  */
495 
496 /*
497  * Definition of a scatter/gather element as transferred to the controller.
498  * The aic7xxx chips only support a 24bit length.  We use the top byte of
499  * the length to store additional address bits and a flag to indicate
500  * that a given segment terminates the transfer.  This gives us an
501  * addressable range of 512GB on machines with 64bit PCI or with chips
502  * that can support dual address cycles on 32bit PCI busses.
503  */
504 struct ahc_dma_seg {
505 	uint32_t	addr;
506 	uint32_t	len;
507 #define	AHC_DMA_LAST_SEG	0x80000000
508 #define	AHC_SG_HIGH_ADDR_MASK	0x7F000000
509 #define	AHC_SG_LEN_MASK		0x00FFFFFF
510 };
511 
512 struct sg_map_node {
513 	bus_dmamap_t		 sg_dmamap;
514 	dma_addr_t		 sg_physaddr;
515 	struct ahc_dma_seg*	 sg_vaddr;
516 	SLIST_ENTRY(sg_map_node) links;
517 };
518 
519 /*
520  * The current state of this SCB.
521  */
522 typedef enum {
523 	SCB_FREE		= 0x0000,
524 	SCB_OTHERTCL_TIMEOUT	= 0x0002,/*
525 					  * Another device was active
526 					  * during the first timeout for
527 					  * this SCB so we gave ourselves
528 					  * an additional timeout period
529 					  * in case it was hogging the
530 					  * bus.
531 				          */
532 	SCB_DEVICE_RESET	= 0x0004,
533 	SCB_SENSE		= 0x0008,
534 	SCB_CDB32_PTR		= 0x0010,
535 	SCB_RECOVERY_SCB	= 0x0020,
536 	SCB_AUTO_NEGOTIATE	= 0x0040,/* Negotiate to achieve goal. */
537 	SCB_NEGOTIATE		= 0x0080,/* Negotiation forced for command. */
538 	SCB_ABORT		= 0x0100,
539 	SCB_UNTAGGEDQ		= 0x0200,
540 	SCB_ACTIVE		= 0x0400,
541 	SCB_TARGET_IMMEDIATE	= 0x0800,
542 	SCB_TRANSMISSION_ERROR	= 0x1000,/*
543 					  * We detected a parity or CRC
544 					  * error that has effected the
545 					  * payload of the command.  This
546 					  * flag is checked when normal
547 					  * status is returned to catch
548 					  * the case of a target not
549 					  * responding to our attempt
550 					  * to report the error.
551 					  */
552 	SCB_TARGET_SCB		= 0x2000,
553 	SCB_SILENT		= 0x4000 /*
554 					  * Be quiet about transmission type
555 					  * errors.  They are expected and we
556 					  * don't want to upset the user.  This
557 					  * flag is typically used during DV.
558 					  */
559 } scb_flag;
560 
561 struct scb {
562 	struct	hardware_scb	 *hscb;
563 	union {
564 		SLIST_ENTRY(scb)  sle;
565 		TAILQ_ENTRY(scb)  tqe;
566 	} links;
567 	LIST_ENTRY(scb)		  pending_links;
568 	ahc_io_ctx_t		  io_ctx;
569 	struct ahc_softc	 *ahc_softc;
570 	scb_flag		  flags;
571 	struct scb_platform_data *platform_data;
572 	struct sg_map_node	 *sg_map;
573 	struct ahc_dma_seg 	 *sg_list;
574 	dma_addr_t		  sg_list_phys;
575 	u_int			  sg_count;/* How full ahc_dma_seg is */
576 };
577 
578 struct scb_data {
579 	SLIST_HEAD(, scb) free_scbs;	/*
580 					 * Pool of SCBs ready to be assigned
581 					 * commands to execute.
582 					 */
583 	struct	scb *scbindex[256];	/*
584 					 * Mapping from tag to SCB.
585 					 * As tag identifiers are an
586 					 * 8bit value, we provide space
587 					 * for all possible tag values.
588 					 * Any lookups to entries at or
589 					 * above AHC_SCB_MAX_ALLOC will
590 					 * always fail.
591 					 */
592 	struct	hardware_scb	*hscbs;	/* Array of hardware SCBs */
593 	struct	scb *scbarray;		/* Array of kernel SCBs */
594 	struct	scsi_sense_data *sense; /* Per SCB sense data */
595 
596 	/*
597 	 * "Bus" addresses of our data structures.
598 	 */
599 	bus_dma_tag_t	 hscb_dmat;	/* dmat for our hardware SCB array */
600 	bus_dmamap_t	 hscb_dmamap;
601 	dma_addr_t	 hscb_busaddr;
602 	bus_dma_tag_t	 sense_dmat;
603 	bus_dmamap_t	 sense_dmamap;
604 	dma_addr_t	 sense_busaddr;
605 	bus_dma_tag_t	 sg_dmat;	/* dmat for our sg segments */
606 	SLIST_HEAD(, sg_map_node) sg_maps;
607 	uint8_t	numscbs;
608 	uint8_t	maxhscbs;		/* Number of SCBs on the card */
609 	uint8_t	init_level;		/*
610 					 * How far we've initialized
611 					 * this structure.
612 					 */
613 };
614 
615 /************************ Target Mode Definitions *****************************/
616 
617 /*
618  * Connection descriptor for select-in requests in target mode.
619  */
620 struct target_cmd {
621 	uint8_t scsiid;		/* Our ID and the initiator's ID */
622 	uint8_t identify;	/* Identify message */
623 	uint8_t bytes[22];	/*
624 				 * Bytes contains any additional message
625 				 * bytes terminated by 0xFF.  The remainder
626 				 * is the cdb to execute.
627 				 */
628 	uint8_t cmd_valid;	/*
629 				 * When a command is complete, the firmware
630 				 * will set cmd_valid to all bits set.
631 				 * After the host has seen the command,
632 				 * the bits are cleared.  This allows us
633 				 * to just peek at host memory to determine
634 				 * if more work is complete. cmd_valid is on
635 				 * an 8 byte boundary to simplify setting
636 				 * it on aic7880 hardware which only has
637 				 * limited direct access to the DMA FIFO.
638 				 */
639 	uint8_t pad[7];
640 };
641 
642 /*
643  * Number of events we can buffer up if we run out
644  * of immediate notify ccbs.
645  */
646 #define AHC_TMODE_EVENT_BUFFER_SIZE 8
647 struct ahc_tmode_event {
648 	uint8_t initiator_id;
649 	uint8_t event_type;	/* MSG type or EVENT_TYPE_BUS_RESET */
650 #define	EVENT_TYPE_BUS_RESET 0xFF
651 	uint8_t event_arg;
652 };
653 
654 /*
655  * Per enabled lun target mode state.
656  * As this state is directly influenced by the host OS'es target mode
657  * environment, we let the OS module define it.  Forward declare the
658  * structure here so we can store arrays of them, etc. in OS neutral
659  * data structures.
660  */
661 #ifdef AHC_TARGET_MODE
662 struct ahc_tmode_lstate {
663 	struct cam_path *path;
664 	struct ccb_hdr_slist accept_tios;
665 	struct ccb_hdr_slist immed_notifies;
666 	struct ahc_tmode_event event_buffer[AHC_TMODE_EVENT_BUFFER_SIZE];
667 	uint8_t event_r_idx;
668 	uint8_t event_w_idx;
669 };
670 #else
671 struct ahc_tmode_lstate;
672 #endif
673 
674 /******************** Transfer Negotiation Datastructures *********************/
675 #define AHC_TRANS_CUR		0x01	/* Modify current neogtiation status */
676 #define AHC_TRANS_ACTIVE	0x03	/* Assume this target is on the bus */
677 #define AHC_TRANS_GOAL		0x04	/* Modify negotiation goal */
678 #define AHC_TRANS_USER		0x08	/* Modify user negotiation settings */
679 
680 #define AHC_WIDTH_UNKNOWN	0xFF
681 #define AHC_PERIOD_UNKNOWN	0xFF
682 #define AHC_OFFSET_UNKNOWN	0xFF
683 #define AHC_PPR_OPTS_UNKNOWN	0xFF
684 
685 /*
686  * Transfer Negotiation Information.
687  */
688 struct ahc_transinfo {
689 	uint8_t protocol_version;	/* SCSI Revision level */
690 	uint8_t transport_version;	/* SPI Revision level */
691 	uint8_t width;			/* Bus width */
692 	uint8_t period;			/* Sync rate factor */
693 	uint8_t offset;			/* Sync offset */
694 	uint8_t ppr_options;		/* Parallel Protocol Request options */
695 };
696 
697 /*
698  * Per-initiator current, goal and user transfer negotiation information. */
699 struct ahc_initiator_tinfo {
700 	uint8_t scsirate;		/* Computed value for SCSIRATE reg */
701 	struct ahc_transinfo curr;
702 	struct ahc_transinfo goal;
703 	struct ahc_transinfo user;
704 };
705 
706 /*
707  * Per enabled target ID state.
708  * Pointers to lun target state as well as sync/wide negotiation information
709  * for each initiator<->target mapping.  For the initiator role we pretend
710  * that we are the target and the targets are the initiators since the
711  * negotiation is the same regardless of role.
712  */
713 struct ahc_tmode_tstate {
714 	struct ahc_tmode_lstate*	enabled_luns[AHC_NUM_LUNS];
715 	struct ahc_initiator_tinfo	transinfo[AHC_NUM_TARGETS];
716 
717 	/*
718 	 * Per initiator state bitmasks.
719 	 */
720 	uint16_t	 auto_negotiate;/* Auto Negotiation Required */
721 	uint16_t	 ultraenb;	/* Using ultra sync rate  */
722 	uint16_t	 discenable;	/* Disconnection allowed  */
723 	uint16_t	 tagenable;	/* Tagged Queuing allowed */
724 };
725 
726 /*
727  * Data structure for our table of allowed synchronous transfer rates.
728  */
729 struct ahc_syncrate {
730 	u_int sxfr_u2;	/* Value of the SXFR parameter for Ultra2+ Chips */
731 	u_int sxfr;	/* Value of the SXFR parameter for <= Ultra Chips */
732 #define		ULTRA_SXFR 0x100	/* Rate Requires Ultra Mode set */
733 #define		ST_SXFR	   0x010	/* Rate Single Transition Only */
734 #define		DT_SXFR	   0x040	/* Rate Double Transition Only */
735 	uint8_t period; /* Period to send to SCSI target */
736 	const char *rate;
737 };
738 
739 /* Safe and valid period for async negotiations. */
740 #define	AHC_ASYNC_XFER_PERIOD 0x45
741 #define	AHC_ULTRA2_XFER_PERIOD 0x0a
742 
743 /*
744  * Indexes into our table of syncronous transfer rates.
745  */
746 #define AHC_SYNCRATE_DT		0
747 #define AHC_SYNCRATE_ULTRA2	1
748 #define AHC_SYNCRATE_ULTRA	3
749 #define AHC_SYNCRATE_FAST	6
750 #define AHC_SYNCRATE_MAX	AHC_SYNCRATE_DT
751 #define	AHC_SYNCRATE_MIN	13
752 
753 /***************************** Lookup Tables **********************************/
754 /*
755  * Phase -> name and message out response
756  * to parity errors in each phase table.
757  */
758 struct ahc_phase_table_entry {
759         uint8_t phase;
760         uint8_t mesg_out; /* Message response to parity errors */
761 	char *phasemsg;
762 };
763 
764 /************************** Serial EEPROM Format ******************************/
765 
766 struct seeprom_config {
767 /*
768  * Per SCSI ID Configuration Flags
769  */
770 	uint16_t device_flags[16];	/* words 0-15 */
771 #define		CFXFER		0x0007	/* synchronous transfer rate */
772 #define		CFSYNCH		0x0008	/* enable synchronous transfer */
773 #define		CFDISC		0x0010	/* enable disconnection */
774 #define		CFWIDEB		0x0020	/* wide bus device */
775 #define		CFSYNCHISULTRA	0x0040	/* CFSYNCH is an ultra offset (2940AU)*/
776 #define		CFSYNCSINGLE	0x0080	/* Single-Transition signalling */
777 #define		CFSTART		0x0100	/* send start unit SCSI command */
778 #define		CFINCBIOS	0x0200	/* include in BIOS scan */
779 #define		CFRNFOUND	0x0400	/* report even if not found */
780 #define		CFMULTILUNDEV	0x0800	/* Probe multiple luns in BIOS scan */
781 #define		CFWBCACHEENB	0x4000	/* Enable W-Behind Cache on disks */
782 #define		CFWBCACHENOP	0xc000	/* Don't touch W-Behind Cache */
783 
784 /*
785  * BIOS Control Bits
786  */
787 	uint16_t bios_control;		/* word 16 */
788 #define		CFSUPREM	0x0001	/* support all removeable drives */
789 #define		CFSUPREMB	0x0002	/* support removeable boot drives */
790 #define		CFBIOSEN	0x0004	/* BIOS enabled */
791 #define		CFBIOS_BUSSCAN	0x0008	/* Have the BIOS Scan the Bus */
792 #define		CFSM2DRV	0x0010	/* support more than two drives */
793 #define		CFSTPWLEVEL	0x0010	/* Termination level control */
794 #define		CF284XEXTEND	0x0020	/* extended translation (284x cards) */
795 #define		CFCTRL_A	0x0020	/* BIOS displays Ctrl-A message */
796 #define		CFTERM_MENU	0x0040	/* BIOS displays termination menu */
797 #define		CFEXTEND	0x0080	/* extended translation enabled */
798 #define		CFSCAMEN	0x0100	/* SCAM enable */
799 #define		CFMSG_LEVEL	0x0600	/* BIOS Message Level */
800 #define			CFMSG_VERBOSE	0x0000
801 #define			CFMSG_SILENT	0x0200
802 #define			CFMSG_DIAG	0x0400
803 #define		CFBOOTCD	0x0800  /* Support Bootable CD-ROM */
804 /*		UNUSED		0xff00	*/
805 
806 /*
807  * Host Adapter Control Bits
808  */
809 	uint16_t adapter_control;	/* word 17 */
810 #define		CFAUTOTERM	0x0001	/* Perform Auto termination */
811 #define		CFULTRAEN	0x0002	/* Ultra SCSI speed enable */
812 #define		CF284XSELTO     0x0003	/* Selection timeout (284x cards) */
813 #define		CF284XFIFO      0x000C	/* FIFO Threshold (284x cards) */
814 #define		CFSTERM		0x0004	/* SCSI low byte termination */
815 #define		CFWSTERM	0x0008	/* SCSI high byte termination */
816 #define		CFSPARITY	0x0010	/* SCSI parity */
817 #define		CF284XSTERM     0x0020	/* SCSI low byte term (284x cards) */
818 #define		CFMULTILUN	0x0020
819 #define		CFRESETB	0x0040	/* reset SCSI bus at boot */
820 #define		CFCLUSTERENB	0x0080	/* Cluster Enable */
821 #define		CFBOOTCHAN	0x0300	/* probe this channel first */
822 #define		CFBOOTCHANSHIFT 8
823 #define		CFSEAUTOTERM	0x0400	/* Ultra2 Perform secondary Auto Term*/
824 #define		CFSELOWTERM	0x0800	/* Ultra2 secondary low term */
825 #define		CFSEHIGHTERM	0x1000	/* Ultra2 secondary high term */
826 #define		CFENABLEDV	0x4000	/* Perform Domain Validation*/
827 
828 /*
829  * Bus Release Time, Host Adapter ID
830  */
831 	uint16_t brtime_id;		/* word 18 */
832 #define		CFSCSIID	0x000f	/* host adapter SCSI ID */
833 /*		UNUSED		0x00f0	*/
834 #define		CFBRTIME	0xff00	/* bus release time */
835 
836 /*
837  * Maximum targets
838  */
839 	uint16_t max_targets;		/* word 19 */
840 #define		CFMAXTARG	0x00ff	/* maximum targets */
841 #define		CFBOOTLUN	0x0f00	/* Lun to boot from */
842 #define		CFBOOTID	0xf000	/* Target to boot from */
843 	uint16_t res_1[10];		/* words 20-29 */
844 	uint16_t signature;		/* Signature == 0x250 */
845 #define		CFSIGNATURE	0x250
846 #define		CFSIGNATURE2	0x300
847 	uint16_t checksum;		/* word 31 */
848 };
849 
850 /****************************  Message Buffer *********************************/
851 typedef enum {
852 	MSG_TYPE_NONE			= 0x00,
853 	MSG_TYPE_INITIATOR_MSGOUT	= 0x01,
854 	MSG_TYPE_INITIATOR_MSGIN	= 0x02,
855 	MSG_TYPE_TARGET_MSGOUT		= 0x03,
856 	MSG_TYPE_TARGET_MSGIN		= 0x04
857 } ahc_msg_type;
858 
859 typedef enum {
860 	MSGLOOP_IN_PROG,
861 	MSGLOOP_MSGCOMPLETE,
862 	MSGLOOP_TERMINATED
863 } msg_loop_stat;
864 
865 /*********************** Software Configuration Structure *********************/
866 TAILQ_HEAD(scb_tailq, scb);
867 
868 struct ahc_aic7770_softc {
869 	/*
870 	 * Saved register state used for chip_init().
871 	 */
872 	uint8_t busspd;
873 	uint8_t bustime;
874 };
875 
876 struct ahc_pci_softc {
877 	/*
878 	 * Saved register state used for chip_init().
879 	 */
880 	uint32_t  devconfig;
881 	uint16_t  targcrccnt;
882 	uint8_t   command;
883 	uint8_t   csize_lattime;
884 	uint8_t   optionmode;
885 	uint8_t   crccontrol1;
886 	uint8_t   dscommand0;
887 	uint8_t   dspcistatus;
888 	uint8_t   scbbaddr;
889 	uint8_t   dff_thrsh;
890 };
891 
892 union ahc_bus_softc {
893 	struct ahc_aic7770_softc aic7770_softc;
894 	struct ahc_pci_softc pci_softc;
895 };
896 
897 typedef void (*ahc_bus_intr_t)(struct ahc_softc *);
898 typedef int (*ahc_bus_chip_init_t)(struct ahc_softc *);
899 typedef void ahc_callback_t (void *);
900 
901 struct ahc_softc {
902 	bus_space_tag_t           tag;
903 	bus_space_handle_t        bsh;
904 	struct scb_data		 *scb_data;
905 
906 	struct scb		 *next_queued_scb;
907 
908 	/*
909 	 * SCBs that have been sent to the controller
910 	 */
911 	BSD_LIST_HEAD(, scb)	  pending_scbs;
912 
913 	/*
914 	 * Counting lock for deferring the release of additional
915 	 * untagged transactions from the untagged_queues.  When
916 	 * the lock is decremented to 0, all queues in the
917 	 * untagged_queues array are run.
918 	 */
919 	u_int			  untagged_queue_lock;
920 
921 	/*
922 	 * Per-target queue of untagged-transactions.  The
923 	 * transaction at the head of the queue is the
924 	 * currently pending untagged transaction for the
925 	 * target.  The driver only allows a single untagged
926 	 * transaction per target.
927 	 */
928 	struct scb_tailq	  untagged_queues[AHC_NUM_TARGETS];
929 
930 	/*
931 	 * Bus attachment specific data.
932 	 */
933 	union ahc_bus_softc	  bus_softc;
934 
935 	/*
936 	 * Platform specific data.
937 	 */
938 	struct ahc_platform_data *platform_data;
939 
940 	/*
941 	 * Platform specific device information.
942 	 */
943 	ahc_dev_softc_t		  dev_softc;
944 	struct device		  *dev;
945 
946 	/*
947 	 * Bus specific device information.
948 	 */
949 	ahc_bus_intr_t		  bus_intr;
950 
951 	/*
952 	 * Bus specific initialization required
953 	 * after a chip reset.
954 	 */
955 	ahc_bus_chip_init_t	  bus_chip_init;
956 
957 	/*
958 	 * Target mode related state kept on a per enabled lun basis.
959 	 * Targets that are not enabled will have null entries.
960 	 * As an initiator, we keep one target entry for our initiator
961 	 * ID to store our sync/wide transfer settings.
962 	 */
963 	struct ahc_tmode_tstate  *enabled_targets[AHC_NUM_TARGETS];
964 
965 	/*
966 	 * The black hole device responsible for handling requests for
967 	 * disabled luns on enabled targets.
968 	 */
969 	struct ahc_tmode_lstate  *black_hole;
970 
971 	/*
972 	 * Device instance currently on the bus awaiting a continue TIO
973 	 * for a command that was not given the disconnect priveledge.
974 	 */
975 	struct ahc_tmode_lstate  *pending_device;
976 
977 	/*
978 	 * Card characteristics
979 	 */
980 	ahc_chip		  chip;
981 	ahc_feature		  features;
982 	ahc_bug			  bugs;
983 	ahc_flag		  flags;
984 	struct seeprom_config	 *seep_config;
985 
986 	/* Values to store in the SEQCTL register for pause and unpause */
987 	uint8_t			  unpause;
988 	uint8_t			  pause;
989 
990 	/* Command Queues */
991 	uint8_t			  qoutfifonext;
992 	uint8_t			  qinfifonext;
993 	uint8_t			 *qoutfifo;
994 	uint8_t			 *qinfifo;
995 
996 	/* Critical Section Data */
997 	struct cs		 *critical_sections;
998 	u_int			  num_critical_sections;
999 
1000 	/* Channel Names ('A', 'B', etc.) */
1001 	char			  channel;
1002 	char			  channel_b;
1003 
1004 	/* Initiator Bus ID */
1005 	uint8_t			  our_id;
1006 	uint8_t			  our_id_b;
1007 
1008 	/*
1009 	 * PCI error detection.
1010 	 */
1011 	int			  unsolicited_ints;
1012 
1013 	/*
1014 	 * Target incoming command FIFO.
1015 	 */
1016 	struct target_cmd	 *targetcmds;
1017 	uint8_t			  tqinfifonext;
1018 
1019 	/*
1020 	 * Cached copy of the sequencer control register.
1021 	 */
1022 	uint8_t			  seqctl;
1023 
1024 	/*
1025 	 * Incoming and outgoing message handling.
1026 	 */
1027 	uint8_t			  send_msg_perror;
1028 	ahc_msg_type		  msg_type;
1029 	uint8_t			  msgout_buf[12];/* Message we are sending */
1030 	uint8_t			  msgin_buf[12];/* Message we are receiving */
1031 	u_int			  msgout_len;	/* Length of message to send */
1032 	u_int			  msgout_index;	/* Current index in msgout */
1033 	u_int			  msgin_index;	/* Current index in msgin */
1034 
1035 	/*
1036 	 * Mapping information for data structures shared
1037 	 * between the sequencer and kernel.
1038 	 */
1039 	bus_dma_tag_t		  parent_dmat;
1040 	bus_dma_tag_t		  shared_data_dmat;
1041 	bus_dmamap_t		  shared_data_dmamap;
1042 	dma_addr_t		  shared_data_busaddr;
1043 
1044 	/*
1045 	 * Bus address of the one byte buffer used to
1046 	 * work-around a DMA bug for chips <= aic7880
1047 	 * in target mode.
1048 	 */
1049 	dma_addr_t		  dma_bug_buf;
1050 
1051 	/* Number of enabled target mode device on this card */
1052 	u_int			  enabled_luns;
1053 
1054 	/* Initialization level of this data structure */
1055 	u_int			  init_level;
1056 
1057 	/* PCI cacheline size. */
1058 	u_int			  pci_cachesize;
1059 
1060 	/*
1061 	 * Count of parity errors we have seen as a target.
1062 	 * We auto-disable parity error checking after seeing
1063 	 * AHC_PCI_TARGET_PERR_THRESH number of errors.
1064 	 */
1065 	u_int			  pci_target_perr_count;
1066 #define		AHC_PCI_TARGET_PERR_THRESH	10
1067 
1068 	/* Maximum number of sequencer instructions supported. */
1069 	u_int			  instruction_ram_size;
1070 
1071 	/* Per-Unit descriptive information */
1072 	const char		 *description;
1073 	char			 *name;
1074 	int			  unit;
1075 
1076 	/* Selection Timer settings */
1077 	int			  seltime;
1078 	int			  seltime_b;
1079 
1080 	uint16_t	 	  user_discenable;/* Disconnection allowed  */
1081 	uint16_t		  user_tagenable;/* Tagged Queuing allowed */
1082 };
1083 
1084 /************************ Active Device Information ***************************/
1085 typedef enum {
1086 	ROLE_UNKNOWN,
1087 	ROLE_INITIATOR,
1088 	ROLE_TARGET
1089 } role_t;
1090 
1091 struct ahc_devinfo {
1092 	int	 our_scsiid;
1093 	int	 target_offset;
1094 	uint16_t target_mask;
1095 	u_int	 target;
1096 	u_int	 lun;
1097 	char	 channel;
1098 	role_t	 role;		/*
1099 				 * Only guaranteed to be correct if not
1100 				 * in the busfree state.
1101 				 */
1102 };
1103 
1104 /****************************** PCI Structures ********************************/
1105 typedef int (ahc_device_setup_t)(struct ahc_softc *);
1106 
1107 struct ahc_pci_identity {
1108 	uint64_t		 full_id;
1109 	uint64_t		 id_mask;
1110 	const char		*name;
1111 	ahc_device_setup_t	*setup;
1112 };
1113 
1114 /***************************** VL/EISA Declarations ***************************/
1115 struct aic7770_identity {
1116 	uint32_t		 full_id;
1117 	uint32_t		 id_mask;
1118 	const char		*name;
1119 	ahc_device_setup_t	*setup;
1120 };
1121 extern struct aic7770_identity aic7770_ident_table[];
1122 extern const int ahc_num_aic7770_devs;
1123 
1124 #define AHC_EISA_SLOT_OFFSET	0xc00
1125 #define AHC_EISA_IOSIZE		0x100
1126 
1127 /*************************** Function Declarations ****************************/
1128 /******************************************************************************/
1129 
1130 /***************************** PCI Front End *********************************/
1131 const struct ahc_pci_identity	*ahc_find_pci_device(ahc_dev_softc_t);
1132 int			 ahc_pci_config(struct ahc_softc *,
1133 					const struct ahc_pci_identity *);
1134 int			 ahc_pci_test_register_access(struct ahc_softc *);
1135 void __maybe_unused	 ahc_pci_resume(struct ahc_softc *ahc);
1136 
1137 /*************************** EISA/VL Front End ********************************/
1138 struct aic7770_identity *aic7770_find_device(uint32_t);
1139 int			 aic7770_config(struct ahc_softc *ahc,
1140 					struct aic7770_identity *,
1141 					u_int port);
1142 
1143 /************************** SCB and SCB queue management **********************/
1144 int		ahc_probe_scbs(struct ahc_softc *);
1145 void		ahc_qinfifo_requeue_tail(struct ahc_softc *ahc,
1146 					 struct scb *scb);
1147 int		ahc_match_scb(struct ahc_softc *ahc, struct scb *scb,
1148 			      int target, char channel, int lun,
1149 			      u_int tag, role_t role);
1150 
1151 /****************************** Initialization ********************************/
1152 struct ahc_softc	*ahc_alloc(void *platform_arg, char *name);
1153 int			 ahc_softc_init(struct ahc_softc *);
1154 void			 ahc_controller_info(struct ahc_softc *ahc, char *buf);
1155 int			 ahc_chip_init(struct ahc_softc *ahc);
1156 int			 ahc_init(struct ahc_softc *ahc);
1157 void			 ahc_intr_enable(struct ahc_softc *ahc, int enable);
1158 void			 ahc_pause_and_flushwork(struct ahc_softc *ahc);
1159 int __maybe_unused	 ahc_suspend(struct ahc_softc *ahc);
1160 int __maybe_unused	 ahc_resume(struct ahc_softc *ahc);
1161 void			 ahc_set_unit(struct ahc_softc *, int);
1162 void			 ahc_set_name(struct ahc_softc *, char *);
1163 void			 ahc_free(struct ahc_softc *ahc);
1164 int			 ahc_reset(struct ahc_softc *ahc, int reinit);
1165 
1166 /***************************** Error Recovery *********************************/
1167 typedef enum {
1168 	SEARCH_COMPLETE,
1169 	SEARCH_COUNT,
1170 	SEARCH_REMOVE
1171 } ahc_search_action;
1172 int			ahc_search_qinfifo(struct ahc_softc *ahc, int target,
1173 					   char channel, int lun, u_int tag,
1174 					   role_t role, uint32_t status,
1175 					   ahc_search_action action);
1176 int			ahc_search_untagged_queues(struct ahc_softc *ahc,
1177 						   ahc_io_ctx_t ctx,
1178 						   int target, char channel,
1179 						   int lun, uint32_t status,
1180 						   ahc_search_action action);
1181 int			ahc_search_disc_list(struct ahc_softc *ahc, int target,
1182 					     char channel, int lun, u_int tag,
1183 					     int stop_on_first, int remove,
1184 					     int save_state);
1185 int			ahc_reset_channel(struct ahc_softc *ahc, char channel,
1186 					  int initiate_reset);
1187 
1188 /*************************** Utility Functions ********************************/
1189 void			ahc_compile_devinfo(struct ahc_devinfo *devinfo,
1190 					    u_int our_id, u_int target,
1191 					    u_int lun, char channel,
1192 					    role_t role);
1193 /************************** Transfer Negotiation ******************************/
1194 const struct ahc_syncrate*	ahc_find_syncrate(struct ahc_softc *ahc, u_int *period,
1195 					  u_int *ppr_options, u_int maxsync);
1196 u_int			ahc_find_period(struct ahc_softc *ahc,
1197 					u_int scsirate, u_int maxsync);
1198 /*
1199  * Negotiation types.  These are used to qualify if we should renegotiate
1200  * even if our goal and current transport parameters are identical.
1201  */
1202 typedef enum {
1203 	AHC_NEG_TO_GOAL,	/* Renegotiate only if goal and curr differ. */
1204 	AHC_NEG_IF_NON_ASYNC,	/* Renegotiate so long as goal is non-async. */
1205 	AHC_NEG_ALWAYS		/* Renegotiat even if goal is async. */
1206 } ahc_neg_type;
1207 int			ahc_update_neg_request(struct ahc_softc*,
1208 					       struct ahc_devinfo*,
1209 					       struct ahc_tmode_tstate*,
1210 					       struct ahc_initiator_tinfo*,
1211 					       ahc_neg_type);
1212 void			ahc_set_width(struct ahc_softc *ahc,
1213 				      struct ahc_devinfo *devinfo,
1214 				      u_int width, u_int type, int paused);
1215 void			ahc_set_syncrate(struct ahc_softc *ahc,
1216 					 struct ahc_devinfo *devinfo,
1217 					 const struct ahc_syncrate *syncrate,
1218 					 u_int period, u_int offset,
1219 					 u_int ppr_options,
1220 					 u_int type, int paused);
1221 typedef enum {
1222 	AHC_QUEUE_NONE,
1223 	AHC_QUEUE_BASIC,
1224 	AHC_QUEUE_TAGGED
1225 } ahc_queue_alg;
1226 
1227 /**************************** Target Mode *************************************/
1228 #ifdef AHC_TARGET_MODE
1229 void		ahc_send_lstate_events(struct ahc_softc *,
1230 				       struct ahc_tmode_lstate *);
1231 void		ahc_handle_en_lun(struct ahc_softc *ahc,
1232 				  struct cam_sim *sim, union ccb *ccb);
1233 cam_status	ahc_find_tmode_devs(struct ahc_softc *ahc,
1234 				    struct cam_sim *sim, union ccb *ccb,
1235 				    struct ahc_tmode_tstate **tstate,
1236 				    struct ahc_tmode_lstate **lstate,
1237 				    int notfound_failure);
1238 #ifndef AHC_TMODE_ENABLE
1239 #define AHC_TMODE_ENABLE 0
1240 #endif
1241 #endif
1242 /******************************* Debug ***************************************/
1243 #ifdef AHC_DEBUG
1244 extern uint32_t ahc_debug;
1245 #define	AHC_SHOW_MISC		0x0001
1246 #define	AHC_SHOW_SENSE		0x0002
1247 #define AHC_DUMP_SEEPROM	0x0004
1248 #define AHC_SHOW_TERMCTL	0x0008
1249 #define AHC_SHOW_MEMORY		0x0010
1250 #define AHC_SHOW_MESSAGES	0x0020
1251 #define	AHC_SHOW_DV		0x0040
1252 #define AHC_SHOW_SELTO		0x0080
1253 #define AHC_SHOW_QFULL		0x0200
1254 #define AHC_SHOW_QUEUE		0x0400
1255 #define AHC_SHOW_TQIN		0x0800
1256 #define AHC_SHOW_MASKED_ERRORS	0x1000
1257 #define AHC_DEBUG_SEQUENCER	0x2000
1258 #endif
1259 void			ahc_print_devinfo(struct ahc_softc *ahc,
1260 					  struct ahc_devinfo *dev);
1261 void			ahc_dump_card_state(struct ahc_softc *ahc);
1262 int			ahc_print_register(const ahc_reg_parse_entry_t *table,
1263 					   u_int num_entries,
1264 					   const char *name,
1265 					   u_int address,
1266 					   u_int value,
1267 					   u_int *cur_column,
1268 					   u_int wrap_point);
1269 /******************************* SEEPROM *************************************/
1270 int		ahc_acquire_seeprom(struct ahc_softc *ahc,
1271 				    struct seeprom_descriptor *sd);
1272 void		ahc_release_seeprom(struct seeprom_descriptor *sd);
1273 #endif /* _AIC7XXX_H_ */
1274