Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1352 insertions, 0 deletions

diff --git a/drivers/scsi/aic7xxx/aic7xxx.h b/drivers/scsi/aic7xxx/aic7xxx.h
new file mode 100644
index 000000000000..8ff16fd8ed49
--- /dev/null
+++ b/drivers/scsi/aic7xxx/aic7xxx.h
@@ -0,0 +1,1352 @@
+/*
+ * Core definitions and data structures shareable across OS platforms.
+ *
+ * Copyright (c) 1994-2001 Justin T. Gibbs.
+ * Copyright (c) 2000-2001 Adaptec Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    substantially similar to the "NO WARRANTY" disclaimer below
+ *    ("Disclaimer") and any redistribution must be conditioned upon
+ *    including a substantially similar Disclaimer requirement for further
+ *    binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ *    of any contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ *
+ * $Id: //depot/aic7xxx/aic7xxx/aic7xxx.h#79 $
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _AIC7XXX_H_
+#define _AIC7XXX_H_
+
+/* Register Definitions */
+#include "aic7xxx_reg.h"
+
+/************************* Forward Declarations *******************************/
+struct ahc_platform_data;
+struct scb_platform_data;
+struct seeprom_descriptor;
+
+/****************************** Useful Macros *********************************/
+#ifndef MAX
+#define MAX(a,b) (((a) > (b)) ? (a) : (b))
+#endif
+
+#ifndef MIN
+#define MIN(a,b) (((a) < (b)) ? (a) : (b))
+#endif
+
+#ifndef TRUE
+#define TRUE 1
+#endif
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+#define NUM_ELEMENTS(array) (sizeof(array) / sizeof(*array))
+
+#define ALL_CHANNELS '\0'
+#define ALL_TARGETS_MASK 0xFFFF
+#define INITIATOR_WILDCARD	(~0)
+
+#define SCSIID_TARGET(ahc, scsiid) \
+	(((scsiid) & ((((ahc)->features & AHC_TWIN) != 0) ? TWIN_TID : TID)) \
+	>> TID_SHIFT)
+#define SCSIID_OUR_ID(scsiid) \
+	((scsiid) & OID)
+#define SCSIID_CHANNEL(ahc, scsiid) \
+	((((ahc)->features & AHC_TWIN) != 0) \
+        ? ((((scsiid) & TWIN_CHNLB) != 0) ? 'B' : 'A') \
+       : 'A')
+#define	SCB_IS_SCSIBUS_B(ahc, scb) \
+	(SCSIID_CHANNEL(ahc, (scb)->hscb->scsiid) == 'B')
+#define	SCB_GET_OUR_ID(scb) \
+	SCSIID_OUR_ID((scb)->hscb->scsiid)
+#define	SCB_GET_TARGET(ahc, scb) \
+	SCSIID_TARGET((ahc), (scb)->hscb->scsiid)
+#define	SCB_GET_CHANNEL(ahc, scb) \
+	SCSIID_CHANNEL(ahc, (scb)->hscb->scsiid)
+#define	SCB_GET_LUN(scb) \
+	((scb)->hscb->lun & LID)
+#define SCB_GET_TARGET_OFFSET(ahc, scb)	\
+	(SCB_GET_TARGET(ahc, scb) + (SCB_IS_SCSIBUS_B(ahc, scb) ? 8 : 0))
+#define SCB_GET_TARGET_MASK(ahc, scb) \
+	(0x01 << (SCB_GET_TARGET_OFFSET(ahc, scb)))
+#ifdef AHC_DEBUG
+#define SCB_IS_SILENT(scb)					\
+	((ahc_debug & AHC_SHOW_MASKED_ERRORS) == 0		\
+      && (((scb)->flags & SCB_SILENT) != 0))
+#else
+#define SCB_IS_SILENT(scb)					\
+	(((scb)->flags & SCB_SILENT) != 0)
+#endif
+#define TCL_TARGET_OFFSET(tcl) \
+	((((tcl) >> 4) & TID) >> 4)
+#define TCL_LUN(tcl) \
+	(tcl & (AHC_NUM_LUNS - 1))
+#define BUILD_TCL(scsiid, lun) \
+	((lun) | (((scsiid) & TID) << 4))
+
+#ifndef	AHC_TARGET_MODE
+#undef	AHC_TMODE_ENABLE
+#define	AHC_TMODE_ENABLE 0
+#endif
+
+/**************************** Driver Constants ********************************/
+/*
+ * The maximum number of supported targets.
+ */
+#define AHC_NUM_TARGETS 16
+
+/*
+ * The maximum number of supported luns.
+ * The identify message only supports 64 luns in SPI3.
+ * You can have 2^64 luns when information unit transfers are enabled,
+ * but it is doubtful this driver will ever support IUTs.
+ */
+#define AHC_NUM_LUNS 64
+
+/*
+ * The maximum transfer per S/G segment.
+ */
+#define AHC_MAXTRANSFER_SIZE	 0x00ffffff	/* limited by 24bit counter */
+
+/*
+ * The maximum amount of SCB storage in hardware on a controller.
+ * This value represents an upper bound.  Controllers vary in the number
+ * they actually support.
+ */
+#define AHC_SCB_MAX	255
+
+/*
+ * The maximum number of concurrent transactions supported per driver instance.
+ * Sequencer Control Blocks (SCBs) store per-transaction information.  Although
+ * the space for SCBs on the host adapter varies by model, the driver will
+ * page the SCBs between host and controller memory as needed.  We are limited
+ * to 253 because:
+ * 	1) The 8bit nature of the RISC engine holds us to an 8bit value.
+ * 	2) We reserve one value, 255, to represent the invalid element.
+ *	3) Our input queue scheme requires one SCB to always be reserved
+ *	   in advance of queuing any SCBs.  This takes us down to 254.
+ *	4) To handle our output queue correctly on machines that only
+ * 	   support 32bit stores, we must clear the array 4 bytes at a
+ *	   time.  To avoid colliding with a DMA write from the sequencer,
+ *	   we must be sure that 4 slots are empty when we write to clear
+ *	   the queue.  This reduces us to 253 SCBs: 1 that just completed
+ *	   and the known three additional empty slots in the queue that
+ *	   precede it.
+ */
+#define AHC_MAX_QUEUE	253
+
+/*
+ * The maximum amount of SCB storage we allocate in host memory.  This
+ * number should reflect the 1 additional SCB we require to handle our
+ * qinfifo mechanism.
+ */
+#define AHC_SCB_MAX_ALLOC (AHC_MAX_QUEUE+1)
+
+/*
+ * Ring Buffer of incoming target commands.
+ * We allocate 256 to simplify the logic in the sequencer
+ * by using the natural wrap point of an 8bit counter.
+ */
+#define AHC_TMODE_CMDS	256
+
+/* Reset line assertion time in us */
+#define AHC_BUSRESET_DELAY	25
+
+/******************* Chip Characteristics/Operating Settings  *****************/
+/*
+ * Chip Type
+ * The chip order is from least sophisticated to most sophisticated.
+ */
+typedef enum {
+	AHC_NONE	= 0x0000,
+	AHC_CHIPID_MASK	= 0x00FF,
+	AHC_AIC7770	= 0x0001,
+	AHC_AIC7850	= 0x0002,
+	AHC_AIC7855	= 0x0003,
+	AHC_AIC7859	= 0x0004,
+	AHC_AIC7860	= 0x0005,
+	AHC_AIC7870	= 0x0006,
+	AHC_AIC7880	= 0x0007,
+	AHC_AIC7895	= 0x0008,
+	AHC_AIC7895C	= 0x0009,
+	AHC_AIC7890	= 0x000a,
+	AHC_AIC7896	= 0x000b,
+	AHC_AIC7892	= 0x000c,
+	AHC_AIC7899	= 0x000d,
+	AHC_VL		= 0x0100,	/* Bus type VL */
+	AHC_EISA	= 0x0200,	/* Bus type EISA */
+	AHC_PCI		= 0x0400,	/* Bus type PCI */
+	AHC_BUS_MASK	= 0x0F00
+} ahc_chip;
+
+/*
+ * Features available in each chip type.
+ */
+typedef enum {
+	AHC_FENONE	= 0x00000,
+	AHC_ULTRA	= 0x00001,	/* Supports 20MHz Transfers */
+	AHC_ULTRA2	= 0x00002,	/* Supports 40MHz Transfers */
+	AHC_WIDE  	= 0x00004,	/* Wide Channel */
+	AHC_TWIN	= 0x00008,	/* Twin Channel */
+	AHC_MORE_SRAM	= 0x00010,	/* 80 bytes instead of 64 */
+	AHC_CMD_CHAN	= 0x00020,	/* Has a Command DMA Channel */
+	AHC_QUEUE_REGS	= 0x00040,	/* Has Queue management registers */
+	AHC_SG_PRELOAD	= 0x00080,	/* Can perform auto-SG preload */
+	AHC_SPIOCAP	= 0x00100,	/* Has a Serial Port I/O Cap Register */
+	AHC_MULTI_TID	= 0x00200,	/* Has bitmask of TIDs for select-in */
+	AHC_HS_MAILBOX	= 0x00400,	/* Has HS_MAILBOX register */
+	AHC_DT		= 0x00800,	/* Double Transition transfers */
+	AHC_NEW_TERMCTL	= 0x01000,	/* Newer termination scheme */
+	AHC_MULTI_FUNC	= 0x02000,	/* Multi-Function Twin Channel Device */
+	AHC_LARGE_SCBS	= 0x04000,	/* 64byte SCBs */
+	AHC_AUTORATE	= 0x08000,	/* Automatic update of SCSIRATE/OFFSET*/
+	AHC_AUTOPAUSE	= 0x10000,	/* Automatic pause on register access */
+	AHC_TARGETMODE	= 0x20000,	/* Has tested target mode support */
+	AHC_MULTIROLE	= 0x40000,	/* Space for two roles at a time */
+	AHC_REMOVABLE	= 0x80000,	/* Hot-Swap supported */
+	AHC_AIC7770_FE	= AHC_FENONE,
+	/*
+	 * The real 7850 does not support Ultra modes, but there are
+	 * several cards that use the generic 7850 PCI ID even though
+	 * they are using an Ultra capable chip (7859/7860).  We start
+	 * out with the AHC_ULTRA feature set and then check the DEVSTATUS
+	 * register to determine if the capability is really present.
+	 */
+	AHC_AIC7850_FE	= AHC_SPIOCAP|AHC_AUTOPAUSE|AHC_TARGETMODE|AHC_ULTRA,
+	AHC_AIC7860_FE	= AHC_AIC7850_FE,
+	AHC_AIC7870_FE	= AHC_TARGETMODE,
+	AHC_AIC7880_FE	= AHC_AIC7870_FE|AHC_ULTRA,
+	/*
+	 * Although we have space for both the initiator and
+	 * target roles on ULTRA2 chips, we currently disable
+	 * the initiator role to allow multi-scsi-id target mode
+	 * configurations.  We can only respond on the same SCSI
+	 * ID as our initiator role if we allow initiator operation.
+	 * At some point, we should add a configuration knob to
+	 * allow both roles to be loaded.
+	 */
+	AHC_AIC7890_FE	= AHC_MORE_SRAM|AHC_CMD_CHAN|AHC_ULTRA2
+			  |AHC_QUEUE_REGS|AHC_SG_PRELOAD|AHC_MULTI_TID
+			  |AHC_HS_MAILBOX|AHC_NEW_TERMCTL|AHC_LARGE_SCBS
+			  |AHC_TARGETMODE,
+	AHC_AIC7892_FE	= AHC_AIC7890_FE|AHC_DT|AHC_AUTORATE|AHC_AUTOPAUSE,
+	AHC_AIC7895_FE	= AHC_AIC7880_FE|AHC_MORE_SRAM|AHC_AUTOPAUSE
+			  |AHC_CMD_CHAN|AHC_MULTI_FUNC|AHC_LARGE_SCBS,
+	AHC_AIC7895C_FE	= AHC_AIC7895_FE|AHC_MULTI_TID,
+	AHC_AIC7896_FE	= AHC_AIC7890_FE|AHC_MULTI_FUNC,
+	AHC_AIC7899_FE	= AHC_AIC7892_FE|AHC_MULTI_FUNC
+} ahc_feature;
+
+/*
+ * Bugs in the silicon that we work around in software.
+ */
+typedef enum {
+	AHC_BUGNONE		= 0x00,
+	/*
+	 * On all chips prior to the U2 product line,
+	 * the WIDEODD S/G segment feature does not
+	 * work during scsi->HostBus transfers.
+	 */
+	AHC_TMODE_WIDEODD_BUG	= 0x01,
+	/*
+	 * On the aic7890/91 Rev 0 chips, the autoflush
+	 * feature does not work.  A manual flush of
+	 * the DMA FIFO is required.
+	 */
+	AHC_AUTOFLUSH_BUG	= 0x02,
+	/*
+	 * On many chips, cacheline streaming does not work.
+	 */
+	AHC_CACHETHEN_BUG	= 0x04,
+	/*
+	 * On the aic7896/97 chips, cacheline
+	 * streaming must be enabled.
+	 */
+	AHC_CACHETHEN_DIS_BUG	= 0x08,
+	/*
+	 * PCI 2.1 Retry failure on non-empty data fifo.
+	 */
+	AHC_PCI_2_1_RETRY_BUG	= 0x10,
+	/*
+	 * Controller does not handle cacheline residuals
+	 * properly on S/G segments if PCI MWI instructions
+	 * are allowed.
+	 */
+	AHC_PCI_MWI_BUG		= 0x20,
+	/*
+	 * An SCB upload using the SCB channel's
+	 * auto array entry copy feature may 
+	 * corrupt data.  This appears to only
+	 * occur on 66MHz systems.
+	 */
+	AHC_SCBCHAN_UPLOAD_BUG	= 0x40
+} ahc_bug;
+
+/*
+ * Configuration specific settings.
+ * The driver determines these settings by probing the
+ * chip/controller's configuration.
+ */
+typedef enum {
+	AHC_FNONE	      = 0x000,
+	AHC_PRIMARY_CHANNEL   = 0x003,  /*
+					 * The channel that should
+					 * be probed first.
+					 */
+	AHC_USEDEFAULTS	      = 0x004,  /*
+					 * For cards without an seeprom
+					 * or a BIOS to initialize the chip's
+					 * SRAM, we use the default target
+					 * settings.
+					 */
+	AHC_SEQUENCER_DEBUG   = 0x008,
+	AHC_SHARED_SRAM	      = 0x010,
+	AHC_LARGE_SEEPROM     = 0x020,  /* Uses C56_66 not C46 */
+	AHC_RESET_BUS_A	      = 0x040,
+	AHC_RESET_BUS_B	      = 0x080,
+	AHC_EXTENDED_TRANS_A  = 0x100,
+	AHC_EXTENDED_TRANS_B  = 0x200,
+	AHC_TERM_ENB_A	      = 0x400,
+	AHC_TERM_ENB_B	      = 0x800,
+	AHC_INITIATORROLE     = 0x1000,  /*
+					  * Allow initiator operations on
+					  * this controller.
+					  */
+	AHC_TARGETROLE	      = 0x2000,  /*
+					  * Allow target operations on this
+					  * controller.
+					  */
+	AHC_NEWEEPROM_FMT     = 0x4000,
+	AHC_RESOURCE_SHORTAGE = 0x8000,
+	AHC_TQINFIFO_BLOCKED  = 0x10000,  /* Blocked waiting for ATIOs */
+	AHC_INT50_SPEEDFLEX   = 0x20000,  /*
+					   * Internal 50pin connector
+					   * sits behind an aic3860
+					   */
+	AHC_SCB_BTT	      = 0x40000,  /*
+					   * The busy targets table is
+					   * stored in SCB space rather
+					   * than SRAM.
+					   */
+	AHC_BIOS_ENABLED      = 0x80000,
+	AHC_ALL_INTERRUPTS    = 0x100000,
+	AHC_PAGESCBS	      = 0x400000,  /* Enable SCB paging */
+	AHC_EDGE_INTERRUPT    = 0x800000,  /* Device uses edge triggered ints */
+	AHC_39BIT_ADDRESSING  = 0x1000000, /* Use 39 bit addressing scheme. */
+	AHC_LSCBS_ENABLED     = 0x2000000, /* 64Byte SCBs enabled */
+	AHC_SCB_CONFIG_USED   = 0x4000000, /* No SEEPROM but SCB2 had info. */
+	AHC_NO_BIOS_INIT      = 0x8000000, /* No BIOS left over settings. */
+	AHC_DISABLE_PCI_PERR  = 0x10000000,
+	AHC_HAS_TERM_LOGIC    = 0x20000000
+} ahc_flag;
+
+/************************* Hardware  SCB Definition ***************************/
+
+/*
+ * The driver keeps up to MAX_SCB scb structures per card in memory.  The SCB
+ * consists of a "hardware SCB" mirroring the fields available on the card
+ * and additional information the kernel stores for each transaction.
+ *
+ * To minimize space utilization, a portion of the hardware scb stores
+ * different data during different portions of a SCSI transaction.
+ * As initialized by the host driver for the initiator role, this area
+ * contains the SCSI cdb (or a pointer to the  cdb) to be executed.  After
+ * the cdb has been presented to the target, this area serves to store
+ * residual transfer information and the SCSI status byte.
+ * For the target role, the contents of this area do not change, but
+ * still serve a different purpose than for the initiator role.  See
+ * struct target_data for details.
+ */
+
+/*
+ * Status information embedded in the shared poriton of
+ * an SCB after passing the cdb to the target.  The kernel
+ * driver will only read this data for transactions that
+ * complete abnormally (non-zero status byte).
+ */
+struct status_pkt {
+	uint32_t residual_datacnt;	/* Residual in the current S/G seg */
+	uint32_t residual_sg_ptr;	/* The next S/G for this transfer */
+	uint8_t	 scsi_status;		/* Standard SCSI status byte */
+};
+
+/*
+ * Target mode version of the shared data SCB segment.
+ */
+struct target_data {
+	uint32_t residual_datacnt;	/* Residual in the current S/G seg */
+	uint32_t residual_sg_ptr;	/* The next S/G for this transfer */
+	uint8_t  scsi_status;		/* SCSI status to give to initiator */
+	uint8_t  target_phases;		/* Bitmap of phases to execute */
+	uint8_t  data_phase;		/* Data-In or Data-Out */
+	uint8_t  initiator_tag;		/* Initiator's transaction tag */
+};
+
+struct hardware_scb {
+/*0*/	union {
+		/*
+		 * If the cdb is 12 bytes or less, we embed it directly
+		 * in the SCB.  For longer cdbs, we embed the address
+		 * of the cdb payload as seen by the chip and a DMA
+		 * is used to pull it in.
+		 */
+		uint8_t	 cdb[12];
+		uint32_t cdb_ptr;
+		struct	 status_pkt status;
+		struct	 target_data tdata;
+	} shared_data;
+/*
+ * A word about residuals.
+ * The scb is presented to the sequencer with the dataptr and datacnt
+ * fields initialized to the contents of the first S/G element to
+ * transfer.  The sgptr field is initialized to the bus address for
+ * the S/G element that follows the first in the in core S/G array
+ * or'ed with the SG_FULL_RESID flag.  Sgptr may point to an invalid
+ * S/G entry for this transfer (single S/G element transfer with the
+ * first elements address and length preloaded in the dataptr/datacnt
+ * fields).  If no transfer is to occur, sgptr is set to SG_LIST_NULL.
+ * The SG_FULL_RESID flag ensures that the residual will be correctly
+ * noted even if no data transfers occur.  Once the data phase is entered,
+ * the residual sgptr and datacnt are loaded from the sgptr and the
+ * datacnt fields.  After each S/G element's dataptr and length are
+ * loaded into the hardware, the residual sgptr is advanced.  After
+ * each S/G element is expired, its datacnt field is checked to see
+ * if the LAST_SEG flag is set.  If so, SG_LIST_NULL is set in the
+ * residual sg ptr and the transfer is considered complete.  If the
+ * sequencer determines that there is a residual in the tranfer, it
+ * will set the SG_RESID_VALID flag in sgptr and dma the scb back into
+ * host memory.  To sumarize:
+ *
+ * Sequencer:
+ *	o A residual has occurred if SG_FULL_RESID is set in sgptr,
+ *	  or residual_sgptr does not have SG_LIST_NULL set.
+ *
+ *	o We are transfering the last segment if residual_datacnt has
+ *	  the SG_LAST_SEG flag set.
+ *
+ * Host:
+ *	o A residual has occurred if a completed scb has the
+ *	  SG_RESID_VALID flag set.
+ *
+ *	o residual_sgptr and sgptr refer to the "next" sg entry
+ *	  and so may point beyond the last valid sg entry for the
+ *	  transfer.
+ */ 
+/*12*/	uint32_t dataptr;
+/*16*/	uint32_t datacnt;		/*
+					 * Byte 3 (numbered from 0) of
+					 * the datacnt is really the
+					 * 4th byte in that data address.
+					 */
+/*20*/	uint32_t sgptr;
+#define SG_PTR_MASK	0xFFFFFFF8
+/*24*/	uint8_t  control;	/* See SCB_CONTROL in aic7xxx.reg for details */
+/*25*/	uint8_t  scsiid;	/* what to load in the SCSIID register */
+/*26*/	uint8_t  lun;
+/*27*/	uint8_t  tag;			/*
+					 * Index into our kernel SCB array.
+					 * Also used as the tag for tagged I/O
+					 */
+/*28*/	uint8_t  cdb_len;
+/*29*/	uint8_t  scsirate;		/* Value for SCSIRATE register */
+/*30*/	uint8_t  scsioffset;		/* Value for SCSIOFFSET register */
+/*31*/	uint8_t  next;			/*
+					 * Used for threading SCBs in the
+					 * "Waiting for Selection" and
+					 * "Disconnected SCB" lists down
+					 * in the sequencer.
+					 */
+/*32*/	uint8_t  cdb32[32];		/*
+					 * CDB storage for cdbs of size
+					 * 13->32.  We store them here
+					 * because hardware scbs are
+					 * allocated from DMA safe
+					 * memory so we are guaranteed
+					 * the controller can access
+					 * this data.
+					 */
+};
+
+/************************ Kernel SCB Definitions ******************************/
+/*
+ * Some fields of the SCB are OS dependent.  Here we collect the
+ * definitions for elements that all OS platforms need to include
+ * in there SCB definition.
+ */
+
+/*
+ * Definition of a scatter/gather element as transfered to the controller.
+ * The aic7xxx chips only support a 24bit length.  We use the top byte of
+ * the length to store additional address bits and a flag to indicate
+ * that a given segment terminates the transfer.  This gives us an
+ * addressable range of 512GB on machines with 64bit PCI or with chips
+ * that can support dual address cycles on 32bit PCI busses.
+ */
+struct ahc_dma_seg {
+	uint32_t	addr;
+	uint32_t	len;
+#define	AHC_DMA_LAST_SEG	0x80000000
+#define	AHC_SG_HIGH_ADDR_MASK	0x7F000000
+#define	AHC_SG_LEN_MASK		0x00FFFFFF
+};
+
+struct sg_map_node {
+	bus_dmamap_t		 sg_dmamap;
+	dma_addr_t		 sg_physaddr;
+	struct ahc_dma_seg*	 sg_vaddr;
+	SLIST_ENTRY(sg_map_node) links;
+};
+
+/*
+ * The current state of this SCB.
+ */
+typedef enum {
+	SCB_FREE		= 0x0000,
+	SCB_OTHERTCL_TIMEOUT	= 0x0002,/*
+					  * Another device was active
+					  * during the first timeout for
+					  * this SCB so we gave ourselves
+					  * an additional timeout period
+					  * in case it was hogging the
+					  * bus.
+				          */
+	SCB_DEVICE_RESET	= 0x0004,
+	SCB_SENSE		= 0x0008,
+	SCB_CDB32_PTR		= 0x0010,
+	SCB_RECOVERY_SCB	= 0x0020,
+	SCB_AUTO_NEGOTIATE	= 0x0040,/* Negotiate to achieve goal. */
+	SCB_NEGOTIATE		= 0x0080,/* Negotiation forced for command. */
+	SCB_ABORT		= 0x0100,
+	SCB_UNTAGGEDQ		= 0x0200,
+	SCB_ACTIVE		= 0x0400,
+	SCB_TARGET_IMMEDIATE	= 0x0800,
+	SCB_TRANSMISSION_ERROR	= 0x1000,/*
+					  * We detected a parity or CRC
+					  * error that has effected the
+					  * payload of the command.  This
+					  * flag is checked when normal
+					  * status is returned to catch
+					  * the case of a target not
+					  * responding to our attempt
+					  * to report the error.
+					  */
+	SCB_TARGET_SCB		= 0x2000,
+	SCB_SILENT		= 0x4000 /*
+					  * Be quiet about transmission type
+					  * errors.  They are expected and we
+					  * don't want to upset the user.  This
+					  * flag is typically used during DV.
+					  */
+} scb_flag;
+
+struct scb {
+	struct	hardware_scb	 *hscb;
+	union {
+		SLIST_ENTRY(scb)  sle;
+		TAILQ_ENTRY(scb)  tqe;
+	} links;
+	LIST_ENTRY(scb)		  pending_links;
+	ahc_io_ctx_t		  io_ctx;
+	struct ahc_softc	 *ahc_softc;
+	scb_flag		  flags;
+#ifndef __linux__
+	bus_dmamap_t		  dmamap;
+#endif
+	struct scb_platform_data *platform_data;
+	struct sg_map_node	 *sg_map;
+	struct ahc_dma_seg 	 *sg_list;
+	dma_addr_t		  sg_list_phys;
+	u_int			  sg_count;/* How full ahc_dma_seg is */
+};
+
+struct scb_data {
+	SLIST_HEAD(, scb) free_scbs;	/*
+					 * Pool of SCBs ready to be assigned
+					 * commands to execute.
+					 */
+	struct	scb *scbindex[256];	/*
+					 * Mapping from tag to SCB.
+					 * As tag identifiers are an
+					 * 8bit value, we provide space
+					 * for all possible tag values.
+					 * Any lookups to entries at or
+					 * above AHC_SCB_MAX_ALLOC will
+					 * always fail.
+					 */
+	struct	hardware_scb	*hscbs;	/* Array of hardware SCBs */
+	struct	scb *scbarray;		/* Array of kernel SCBs */
+	struct	scsi_sense_data *sense; /* Per SCB sense data */
+
+	/*
+	 * "Bus" addresses of our data structures.
+	 */
+	bus_dma_tag_t	 hscb_dmat;	/* dmat for our hardware SCB array */
+	bus_dmamap_t	 hscb_dmamap;
+	dma_addr_t	 hscb_busaddr;
+	bus_dma_tag_t	 sense_dmat;
+	bus_dmamap_t	 sense_dmamap;
+	dma_addr_t	 sense_busaddr;
+	bus_dma_tag_t	 sg_dmat;	/* dmat for our sg segments */
+	SLIST_HEAD(, sg_map_node) sg_maps;
+	uint8_t	numscbs;
+	uint8_t	maxhscbs;		/* Number of SCBs on the card */
+	uint8_t	init_level;		/*
+					 * How far we've initialized
+					 * this structure.
+					 */
+};
+
+/************************ Target Mode Definitions *****************************/
+
+/*
+ * Connection desciptor for select-in requests in target mode.
+ */
+struct target_cmd {
+	uint8_t scsiid;		/* Our ID and the initiator's ID */
+	uint8_t identify;	/* Identify message */
+	uint8_t bytes[22];	/* 
+				 * Bytes contains any additional message
+				 * bytes terminated by 0xFF.  The remainder
+				 * is the cdb to execute.
+				 */
+	uint8_t cmd_valid;	/*
+				 * When a command is complete, the firmware
+				 * will set cmd_valid to all bits set.
+				 * After the host has seen the command,
+				 * the bits are cleared.  This allows us
+				 * to just peek at host memory to determine
+				 * if more work is complete. cmd_valid is on
+				 * an 8 byte boundary to simplify setting
+				 * it on aic7880 hardware which only has
+				 * limited direct access to the DMA FIFO.
+				 */
+	uint8_t pad[7];
+};
+
+/*
+ * Number of events we can buffer up if we run out
+ * of immediate notify ccbs.
+ */
+#define AHC_TMODE_EVENT_BUFFER_SIZE 8
+struct ahc_tmode_event {
+	uint8_t initiator_id;
+	uint8_t event_type;	/* MSG type or EVENT_TYPE_BUS_RESET */
+#define	EVENT_TYPE_BUS_RESET 0xFF
+	uint8_t event_arg;
+};
+
+/*
+ * Per enabled lun target mode state.
+ * As this state is directly influenced by the host OS'es target mode
+ * environment, we let the OS module define it.  Forward declare the
+ * structure here so we can store arrays of them, etc. in OS neutral
+ * data structures.
+ */
+#ifdef AHC_TARGET_MODE 
+struct ahc_tmode_lstate {
+	struct cam_path *path;
+	struct ccb_hdr_slist accept_tios;
+	struct ccb_hdr_slist immed_notifies;
+	struct ahc_tmode_event event_buffer[AHC_TMODE_EVENT_BUFFER_SIZE];
+	uint8_t event_r_idx;
+	uint8_t event_w_idx;
+};
+#else
+struct ahc_tmode_lstate;
+#endif
+
+/******************** Transfer Negotiation Datastructures *********************/
+#define AHC_TRANS_CUR		0x01	/* Modify current neogtiation status */
+#define AHC_TRANS_ACTIVE	0x03	/* Assume this target is on the bus */
+#define AHC_TRANS_GOAL		0x04	/* Modify negotiation goal */
+#define AHC_TRANS_USER		0x08	/* Modify user negotiation settings */
+
+#define AHC_WIDTH_UNKNOWN	0xFF
+#define AHC_PERIOD_UNKNOWN	0xFF
+#define AHC_OFFSET_UNKNOWN	0xFF
+#define AHC_PPR_OPTS_UNKNOWN	0xFF
+
+/*
+ * Transfer Negotiation Information.
+ */
+struct ahc_transinfo {
+	uint8_t protocol_version;	/* SCSI Revision level */
+	uint8_t transport_version;	/* SPI Revision level */
+	uint8_t width;			/* Bus width */
+	uint8_t period;			/* Sync rate factor */
+	uint8_t offset;			/* Sync offset */
+	uint8_t ppr_options;		/* Parallel Protocol Request options */
+};
+
+/*
+ * Per-initiator current, goal and user transfer negotiation information. */
+struct ahc_initiator_tinfo {
+	uint8_t scsirate;		/* Computed value for SCSIRATE reg */
+	struct ahc_transinfo curr;
+	struct ahc_transinfo goal;
+	struct ahc_transinfo user;
+};
+
+/*
+ * Per enabled target ID state.
+ * Pointers to lun target state as well as sync/wide negotiation information
+ * for each initiator<->target mapping.  For the initiator role we pretend
+ * that we are the target and the targets are the initiators since the
+ * negotiation is the same regardless of role.
+ */
+struct ahc_tmode_tstate {
+	struct ahc_tmode_lstate*	enabled_luns[AHC_NUM_LUNS];
+	struct ahc_initiator_tinfo	transinfo[AHC_NUM_TARGETS];
+
+	/*
+	 * Per initiator state bitmasks.
+	 */
+	uint16_t	 auto_negotiate;/* Auto Negotiation Required */
+	uint16_t	 ultraenb;	/* Using ultra sync rate  */
+	uint16_t	 discenable;	/* Disconnection allowed  */
+	uint16_t	 tagenable;	/* Tagged Queuing allowed */
+};
+
+/*
+ * Data structure for our table of allowed synchronous transfer rates.
+ */
+struct ahc_syncrate {
+	u_int sxfr_u2;	/* Value of the SXFR parameter for Ultra2+ Chips */
+	u_int sxfr;	/* Value of the SXFR parameter for <= Ultra Chips */
+#define		ULTRA_SXFR 0x100	/* Rate Requires Ultra Mode set */
+#define		ST_SXFR	   0x010	/* Rate Single Transition Only */
+#define		DT_SXFR	   0x040	/* Rate Double Transition Only */
+	uint8_t period; /* Period to send to SCSI target */
+	char *rate;
+};
+
+/* Safe and valid period for async negotiations. */
+#define	AHC_ASYNC_XFER_PERIOD 0x45
+#define	AHC_ULTRA2_XFER_PERIOD 0x0a
+
+/*
+ * Indexes into our table of syncronous transfer rates.
+ */
+#define AHC_SYNCRATE_DT		0
+#define AHC_SYNCRATE_ULTRA2	1
+#define AHC_SYNCRATE_ULTRA	3
+#define AHC_SYNCRATE_FAST	6
+#define AHC_SYNCRATE_MAX	AHC_SYNCRATE_DT
+#define	AHC_SYNCRATE_MIN	13
+
+/***************************** Lookup Tables **********************************/
+/*
+ * Phase -> name and message out response
+ * to parity errors in each phase table. 
+ */
+struct ahc_phase_table_entry {
+        uint8_t phase;
+        uint8_t mesg_out; /* Message response to parity errors */
+	char *phasemsg;
+};
+
+/************************** Serial EEPROM Format ******************************/
+
+struct seeprom_config {
+/*
+ * Per SCSI ID Configuration Flags
+ */
+	uint16_t device_flags[16];	/* words 0-15 */
+#define		CFXFER		0x0007	/* synchronous transfer rate */
+#define		CFSYNCH		0x0008	/* enable synchronous transfer */
+#define		CFDISC		0x0010	/* enable disconnection */
+#define		CFWIDEB		0x0020	/* wide bus device */
+#define		CFSYNCHISULTRA	0x0040	/* CFSYNCH is an ultra offset (2940AU)*/
+#define		CFSYNCSINGLE	0x0080	/* Single-Transition signalling */
+#define		CFSTART		0x0100	/* send start unit SCSI command */
+#define		CFINCBIOS	0x0200	/* include in BIOS scan */
+#define		CFRNFOUND	0x0400	/* report even if not found */
+#define		CFMULTILUNDEV	0x0800	/* Probe multiple luns in BIOS scan */
+#define		CFWBCACHEENB	0x4000	/* Enable W-Behind Cache on disks */
+#define		CFWBCACHENOP	0xc000	/* Don't touch W-Behind Cache */
+
+/*
+ * BIOS Control Bits
+ */
+	uint16_t bios_control;		/* word 16 */
+#define		CFSUPREM	0x0001	/* support all removeable drives */
+#define		CFSUPREMB	0x0002	/* support removeable boot drives */
+#define		CFBIOSEN	0x0004	/* BIOS enabled */
+#define		CFBIOS_BUSSCAN	0x0008	/* Have the BIOS Scan the Bus */
+#define		CFSM2DRV	0x0010	/* support more than two drives */
+#define		CFSTPWLEVEL	0x0010	/* Termination level control */
+#define		CF284XEXTEND	0x0020	/* extended translation (284x cards) */	
+#define		CFCTRL_A	0x0020	/* BIOS displays Ctrl-A message */	
+#define		CFTERM_MENU	0x0040	/* BIOS displays termination menu */	
+#define		CFEXTEND	0x0080	/* extended translation enabled */
+#define		CFSCAMEN	0x0100	/* SCAM enable */
+#define		CFMSG_LEVEL	0x0600	/* BIOS Message Level */
+#define			CFMSG_VERBOSE	0x0000
+#define			CFMSG_SILENT	0x0200
+#define			CFMSG_DIAG	0x0400
+#define		CFBOOTCD	0x0800  /* Support Bootable CD-ROM */
+/*		UNUSED		0xff00	*/
+
+/*
+ * Host Adapter Control Bits
+ */
+	uint16_t adapter_control;	/* word 17 */	
+#define		CFAUTOTERM	0x0001	/* Perform Auto termination */
+#define		CFULTRAEN	0x0002	/* Ultra SCSI speed enable */
+#define		CF284XSELTO     0x0003	/* Selection timeout (284x cards) */
+#define		CF284XFIFO      0x000C	/* FIFO Threshold (284x cards) */
+#define		CFSTERM		0x0004	/* SCSI low byte termination */
+#define		CFWSTERM	0x0008	/* SCSI high byte termination */
+#define		CFSPARITY	0x0010	/* SCSI parity */
+#define		CF284XSTERM     0x0020	/* SCSI low byte term (284x cards) */	
+#define		CFMULTILUN	0x0020
+#define		CFRESETB	0x0040	/* reset SCSI bus at boot */
+#define		CFCLUSTERENB	0x0080	/* Cluster Enable */
+#define		CFBOOTCHAN	0x0300	/* probe this channel first */
+#define		CFBOOTCHANSHIFT 8
+#define		CFSEAUTOTERM	0x0400	/* Ultra2 Perform secondary Auto Term*/
+#define		CFSELOWTERM	0x0800	/* Ultra2 secondary low term */
+#define		CFSEHIGHTERM	0x1000	/* Ultra2 secondary high term */
+#define		CFENABLEDV	0x4000	/* Perform Domain Validation*/
+
+/*
+ * Bus Release Time, Host Adapter ID
+ */
+	uint16_t brtime_id;		/* word 18 */
+#define		CFSCSIID	0x000f	/* host adapter SCSI ID */
+/*		UNUSED		0x00f0	*/
+#define		CFBRTIME	0xff00	/* bus release time */
+
+/*
+ * Maximum targets
+ */
+	uint16_t max_targets;		/* word 19 */	
+#define		CFMAXTARG	0x00ff	/* maximum targets */
+#define		CFBOOTLUN	0x0f00	/* Lun to boot from */
+#define		CFBOOTID	0xf000	/* Target to boot from */
+	uint16_t res_1[10];		/* words 20-29 */
+	uint16_t signature;		/* Signature == 0x250 */
+#define		CFSIGNATURE	0x250
+#define		CFSIGNATURE2	0x300
+	uint16_t checksum;		/* word 31 */
+};
+
+/****************************  Message Buffer *********************************/
+typedef enum {
+	MSG_TYPE_NONE			= 0x00,
+	MSG_TYPE_INITIATOR_MSGOUT	= 0x01,
+	MSG_TYPE_INITIATOR_MSGIN	= 0x02,
+	MSG_TYPE_TARGET_MSGOUT		= 0x03,
+	MSG_TYPE_TARGET_MSGIN		= 0x04
+} ahc_msg_type;
+
+typedef enum {
+	MSGLOOP_IN_PROG,
+	MSGLOOP_MSGCOMPLETE,
+	MSGLOOP_TERMINATED
+} msg_loop_stat;
+
+/*********************** Software Configuration Structure *********************/
+TAILQ_HEAD(scb_tailq, scb);
+
+struct ahc_aic7770_softc {
+	/*
+	 * Saved register state used for chip_init().
+	 */
+	uint8_t busspd;
+	uint8_t bustime;
+};
+
+struct ahc_pci_softc {
+	/*
+	 * Saved register state used for chip_init().
+	 */
+	uint32_t  devconfig;
+	uint16_t  targcrccnt;
+	uint8_t   command;
+	uint8_t   csize_lattime;
+	uint8_t   optionmode;
+	uint8_t   crccontrol1;
+	uint8_t   dscommand0;
+	uint8_t   dspcistatus;
+	uint8_t   scbbaddr;
+	uint8_t   dff_thrsh;
+};
+
+union ahc_bus_softc {
+	struct ahc_aic7770_softc aic7770_softc;
+	struct ahc_pci_softc pci_softc;
+};
+
+typedef void (*ahc_bus_intr_t)(struct ahc_softc *);
+typedef int (*ahc_bus_chip_init_t)(struct ahc_softc *);
+typedef int (*ahc_bus_suspend_t)(struct ahc_softc *);
+typedef int (*ahc_bus_resume_t)(struct ahc_softc *);
+typedef void ahc_callback_t (void *);
+
+struct ahc_softc {
+	bus_space_tag_t           tag;
+	bus_space_handle_t        bsh;
+#ifndef __linux__
+	bus_dma_tag_t		  buffer_dmat;   /* dmat for buffer I/O */
+#endif
+	struct scb_data		 *scb_data;
+
+	struct scb		 *next_queued_scb;
+
+	/*
+	 * SCBs that have been sent to the controller
+	 */
+	LIST_HEAD(, scb)	  pending_scbs;
+
+	/*
+	 * Counting lock for deferring the release of additional
+	 * untagged transactions from the untagged_queues.  When
+	 * the lock is decremented to 0, all queues in the
+	 * untagged_queues array are run.
+	 */
+	u_int			  untagged_queue_lock;
+
+	/*
+	 * Per-target queue of untagged-transactions.  The
+	 * transaction at the head of the queue is the
+	 * currently pending untagged transaction for the
+	 * target.  The driver only allows a single untagged
+	 * transaction per target.
+	 */
+	struct scb_tailq	  untagged_queues[AHC_NUM_TARGETS];
+
+	/*
+	 * Bus attachment specific data.
+	 */
+	union ahc_bus_softc	  bus_softc;
+
+	/*
+	 * Platform specific data.
+	 */
+	struct ahc_platform_data *platform_data;
+
+	/*
+	 * Platform specific device information.
+	 */
+	ahc_dev_softc_t		  dev_softc;
+
+	/*
+	 * Bus specific device information.
+	 */
+	ahc_bus_intr_t		  bus_intr;
+
+	/*
+	 * Bus specific initialization required
+	 * after a chip reset.
+	 */
+	ahc_bus_chip_init_t	  bus_chip_init;
+
+	/*
+	 * Bus specific suspend routine.
+	 */
+	ahc_bus_suspend_t	  bus_suspend;
+
+	/*
+	 * Bus specific resume routine.
+	 */
+	ahc_bus_resume_t	  bus_resume;
+
+	/*
+	 * Target mode related state kept on a per enabled lun basis.
+	 * Targets that are not enabled will have null entries.
+	 * As an initiator, we keep one target entry for our initiator
+	 * ID to store our sync/wide transfer settings.
+	 */
+	struct ahc_tmode_tstate  *enabled_targets[AHC_NUM_TARGETS];
+
+	/*
+	 * The black hole device responsible for handling requests for
+	 * disabled luns on enabled targets.
+	 */
+	struct ahc_tmode_lstate  *black_hole;
+
+	/*
+	 * Device instance currently on the bus awaiting a continue TIO
+	 * for a command that was not given the disconnect priveledge.
+	 */
+	struct ahc_tmode_lstate  *pending_device;
+
+	/*
+	 * Card characteristics
+	 */
+	ahc_chip		  chip;
+	ahc_feature		  features;
+	ahc_bug			  bugs;
+	ahc_flag		  flags;
+	struct seeprom_config	 *seep_config;
+
+	/* Values to store in the SEQCTL register for pause and unpause */
+	uint8_t			  unpause;
+	uint8_t			  pause;
+
+	/* Command Queues */
+	uint8_t			  qoutfifonext;
+	uint8_t			  qinfifonext;
+	uint8_t			 *qoutfifo;
+	uint8_t			 *qinfifo;
+
+	/* Critical Section Data */
+	struct cs		 *critical_sections;
+	u_int			  num_critical_sections;
+
+	/* Links for chaining softcs */
+	TAILQ_ENTRY(ahc_softc)	  links;
+
+	/* Channel Names ('A', 'B', etc.) */
+	char			  channel;
+	char			  channel_b;
+
+	/* Initiator Bus ID */
+	uint8_t			  our_id;
+	uint8_t			  our_id_b;
+
+	/*
+	 * PCI error detection.
+	 */
+	int			  unsolicited_ints;
+
+	/*
+	 * Target incoming command FIFO.
+	 */
+	struct target_cmd	 *targetcmds;
+	uint8_t			  tqinfifonext;
+
+	/*
+	 * Cached copy of the sequencer control register.
+	 */
+	uint8_t			  seqctl;
+
+	/*
+	 * Incoming and outgoing message handling.
+	 */
+	uint8_t			  send_msg_perror;
+	ahc_msg_type		  msg_type;
+	uint8_t			  msgout_buf[12];/* Message we are sending */
+	uint8_t			  msgin_buf[12];/* Message we are receiving */
+	u_int			  msgout_len;	/* Length of message to send */
+	u_int			  msgout_index;	/* Current index in msgout */
+	u_int			  msgin_index;	/* Current index in msgin */
+
+	/*
+	 * Mapping information for data structures shared
+	 * between the sequencer and kernel.
+	 */
+	bus_dma_tag_t		  parent_dmat;
+	bus_dma_tag_t		  shared_data_dmat;
+	bus_dmamap_t		  shared_data_dmamap;
+	dma_addr_t		  shared_data_busaddr;
+
+	/*
+	 * Bus address of the one byte buffer used to
+	 * work-around a DMA bug for chips <= aic7880
+	 * in target mode.
+	 */
+	dma_addr_t		  dma_bug_buf;
+
+	/* Number of enabled target mode device on this card */
+	u_int			  enabled_luns;
+
+	/* Initialization level of this data structure */
+	u_int			  init_level;
+
+	/* PCI cacheline size. */
+	u_int			  pci_cachesize;
+
+	/*
+	 * Count of parity errors we have seen as a target.
+	 * We auto-disable parity error checking after seeing
+	 * AHC_PCI_TARGET_PERR_THRESH number of errors.
+	 */
+	u_int			  pci_target_perr_count;
+#define		AHC_PCI_TARGET_PERR_THRESH	10
+
+	/* Maximum number of sequencer instructions supported. */
+	u_int			  instruction_ram_size;
+
+	/* Per-Unit descriptive information */
+	const char		 *description;
+	char			 *name;
+	int			  unit;
+
+	/* Selection Timer settings */
+	int			  seltime;
+	int			  seltime_b;
+
+	uint16_t	 	  user_discenable;/* Disconnection allowed  */
+	uint16_t		  user_tagenable;/* Tagged Queuing allowed */
+};
+
+TAILQ_HEAD(ahc_softc_tailq, ahc_softc);
+extern struct ahc_softc_tailq ahc_tailq;
+
+/************************ Active Device Information ***************************/
+typedef enum {
+	ROLE_UNKNOWN,
+	ROLE_INITIATOR,
+	ROLE_TARGET
+} role_t;
+
+struct ahc_devinfo {
+	int	 our_scsiid;
+	int	 target_offset;
+	uint16_t target_mask;
+	u_int	 target;
+	u_int	 lun;
+	char	 channel;
+	role_t	 role;		/*
+				 * Only guaranteed to be correct if not
+				 * in the busfree state.
+				 */
+};
+
+/****************************** PCI Structures ********************************/
+typedef int (ahc_device_setup_t)(struct ahc_softc *);
+
+struct ahc_pci_identity {
+	uint64_t		 full_id;
+	uint64_t		 id_mask;
+	char			*name;
+	ahc_device_setup_t	*setup;
+};
+extern struct ahc_pci_identity ahc_pci_ident_table[];
+extern const u_int ahc_num_pci_devs;
+
+/***************************** VL/EISA Declarations ***************************/
+struct aic7770_identity {
+	uint32_t		 full_id;
+	uint32_t		 id_mask;
+	const char		*name;
+	ahc_device_setup_t	*setup;
+};
+extern struct aic7770_identity aic7770_ident_table[];
+extern const int ahc_num_aic7770_devs;
+
+#define AHC_EISA_SLOT_OFFSET	0xc00
+#define AHC_EISA_IOSIZE		0x100
+
+/*************************** Function Declarations ****************************/
+/******************************************************************************/
+u_int			ahc_index_busy_tcl(struct ahc_softc *ahc, u_int tcl);
+void			ahc_unbusy_tcl(struct ahc_softc *ahc, u_int tcl);
+void			ahc_busy_tcl(struct ahc_softc *ahc,
+				     u_int tcl, u_int busyid);
+
+/***************************** PCI Front End *********************************/
+struct ahc_pci_identity	*ahc_find_pci_device(ahc_dev_softc_t);
+int			 ahc_pci_config(struct ahc_softc *,
+					struct ahc_pci_identity *);
+int			 ahc_pci_test_register_access(struct ahc_softc *);
+
+/*************************** EISA/VL Front End ********************************/
+struct aic7770_identity *aic7770_find_device(uint32_t);
+int			 aic7770_config(struct ahc_softc *ahc,
+					struct aic7770_identity *,
+					u_int port);
+
+/************************** SCB and SCB queue management **********************/
+int		ahc_probe_scbs(struct ahc_softc *);
+void		ahc_run_untagged_queues(struct ahc_softc *ahc);
+void		ahc_run_untagged_queue(struct ahc_softc *ahc,
+				       struct scb_tailq *queue);
+void		ahc_qinfifo_requeue_tail(struct ahc_softc *ahc,
+					 struct scb *scb);
+int		ahc_match_scb(struct ahc_softc *ahc, struct scb *scb,
+			      int target, char channel, int lun,
+			      u_int tag, role_t role);
+
+/****************************** Initialization ********************************/
+struct ahc_softc	*ahc_alloc(void *platform_arg, char *name);
+int			 ahc_softc_init(struct ahc_softc *);
+void			 ahc_controller_info(struct ahc_softc *ahc, char *buf);
+int			 ahc_chip_init(struct ahc_softc *ahc);
+int			 ahc_init(struct ahc_softc *ahc);
+void			 ahc_intr_enable(struct ahc_softc *ahc, int enable);
+void			 ahc_pause_and_flushwork(struct ahc_softc *ahc);
+int			 ahc_suspend(struct ahc_softc *ahc); 
+int			 ahc_resume(struct ahc_softc *ahc);
+void			 ahc_softc_insert(struct ahc_softc *);
+struct ahc_softc	*ahc_find_softc(struct ahc_softc *ahc);
+void			 ahc_set_unit(struct ahc_softc *, int);
+void			 ahc_set_name(struct ahc_softc *, char *);
+void			 ahc_alloc_scbs(struct ahc_softc *ahc);
+void			 ahc_free(struct ahc_softc *ahc);
+int			 ahc_reset(struct ahc_softc *ahc, int reinit);
+void			 ahc_shutdown(void *arg);
+
+/*************************** Interrupt Services *******************************/
+void			ahc_clear_intstat(struct ahc_softc *ahc);
+void			ahc_run_qoutfifo(struct ahc_softc *ahc);
+#ifdef AHC_TARGET_MODE
+void			ahc_run_tqinfifo(struct ahc_softc *ahc, int paused);
+#endif
+void			ahc_handle_brkadrint(struct ahc_softc *ahc);
+void			ahc_handle_seqint(struct ahc_softc *ahc, u_int intstat);
+void			ahc_handle_scsiint(struct ahc_softc *ahc,
+					   u_int intstat);
+void			ahc_clear_critical_section(struct ahc_softc *ahc);
+
+/***************************** Error Recovery *********************************/
+typedef enum {
+	SEARCH_COMPLETE,
+	SEARCH_COUNT,
+	SEARCH_REMOVE
+} ahc_search_action;
+int			ahc_search_qinfifo(struct ahc_softc *ahc, int target,
+					   char channel, int lun, u_int tag,
+					   role_t role, uint32_t status,
+					   ahc_search_action action);
+int			ahc_search_untagged_queues(struct ahc_softc *ahc,
+						   ahc_io_ctx_t ctx,
+						   int target, char channel,
+						   int lun, uint32_t status,
+						   ahc_search_action action);
+int			ahc_search_disc_list(struct ahc_softc *ahc, int target,
+					     char channel, int lun, u_int tag,
+					     int stop_on_first, int remove,
+					     int save_state);
+void			ahc_freeze_devq(struct ahc_softc *ahc, struct scb *scb);
+int			ahc_reset_channel(struct ahc_softc *ahc, char channel,
+					  int initiate_reset);
+int			ahc_abort_scbs(struct ahc_softc *ahc, int target,
+				       char channel, int lun, u_int tag,
+				       role_t role, uint32_t status);
+void			ahc_restart(struct ahc_softc *ahc);
+void			ahc_calc_residual(struct ahc_softc *ahc,
+					  struct scb *scb);
+/*************************** Utility Functions ********************************/
+struct ahc_phase_table_entry*
+			ahc_lookup_phase_entry(int phase);
+void			ahc_compile_devinfo(struct ahc_devinfo *devinfo,
+					    u_int our_id, u_int target,
+					    u_int lun, char channel,
+					    role_t role);
+/************************** Transfer Negotiation ******************************/
+struct ahc_syncrate*	ahc_find_syncrate(struct ahc_softc *ahc, u_int *period,
+					  u_int *ppr_options, u_int maxsync);
+u_int			ahc_find_period(struct ahc_softc *ahc,
+					u_int scsirate, u_int maxsync);
+void			ahc_validate_offset(struct ahc_softc *ahc,
+					    struct ahc_initiator_tinfo *tinfo,
+					    struct ahc_syncrate *syncrate,
+					    u_int *offset, int wide,
+					    role_t role);
+void			ahc_validate_width(struct ahc_softc *ahc,
+					   struct ahc_initiator_tinfo *tinfo,
+					   u_int *bus_width,
+					   role_t role);
+/*
+ * Negotiation types.  These are used to qualify if we should renegotiate
+ * even if our goal and current transport parameters are identical.
+ */
+typedef enum {
+	AHC_NEG_TO_GOAL,	/* Renegotiate only if goal and curr differ. */
+	AHC_NEG_IF_NON_ASYNC,	/* Renegotiate so long as goal is non-async. */
+	AHC_NEG_ALWAYS		/* Renegotiat even if goal is async. */
+} ahc_neg_type;
+int			ahc_update_neg_request(struct ahc_softc*,
+					       struct ahc_devinfo*,
+					       struct ahc_tmode_tstate*,
+					       struct ahc_initiator_tinfo*,
+					       ahc_neg_type);
+void			ahc_set_width(struct ahc_softc *ahc,
+				      struct ahc_devinfo *devinfo,
+				      u_int width, u_int type, int paused);
+void			ahc_set_syncrate(struct ahc_softc *ahc,
+					 struct ahc_devinfo *devinfo,
+					 struct ahc_syncrate *syncrate,
+					 u_int period, u_int offset,
+					 u_int ppr_options,
+					 u_int type, int paused);
+typedef enum {
+	AHC_QUEUE_NONE,
+	AHC_QUEUE_BASIC,
+	AHC_QUEUE_TAGGED
+} ahc_queue_alg;
+
+void			ahc_set_tags(struct ahc_softc *ahc,
+				     struct ahc_devinfo *devinfo,
+				     ahc_queue_alg alg);
+
+/**************************** Target Mode *************************************/
+#ifdef AHC_TARGET_MODE
+void		ahc_send_lstate_events(struct ahc_softc *,
+				       struct ahc_tmode_lstate *);
+void		ahc_handle_en_lun(struct ahc_softc *ahc,
+				  struct cam_sim *sim, union ccb *ccb);
+cam_status	ahc_find_tmode_devs(struct ahc_softc *ahc,
+				    struct cam_sim *sim, union ccb *ccb,
+				    struct ahc_tmode_tstate **tstate,
+				    struct ahc_tmode_lstate **lstate,
+				    int notfound_failure);
+#ifndef AHC_TMODE_ENABLE
+#define AHC_TMODE_ENABLE 0
+#endif
+#endif
+/******************************* Debug ***************************************/
+#ifdef AHC_DEBUG
+extern uint32_t ahc_debug;
+#define	AHC_SHOW_MISC		0x0001
+#define	AHC_SHOW_SENSE		0x0002
+#define AHC_DUMP_SEEPROM	0x0004
+#define AHC_SHOW_TERMCTL	0x0008
+#define AHC_SHOW_MEMORY		0x0010
+#define AHC_SHOW_MESSAGES	0x0020
+#define	AHC_SHOW_DV		0x0040
+#define AHC_SHOW_SELTO		0x0080
+#define AHC_SHOW_QFULL		0x0200
+#define AHC_SHOW_QUEUE		0x0400
+#define AHC_SHOW_TQIN		0x0800
+#define AHC_SHOW_MASKED_ERRORS	0x1000
+#define AHC_DEBUG_SEQUENCER	0x2000
+#endif
+void			ahc_print_scb(struct scb *scb);
+void			ahc_print_devinfo(struct ahc_softc *ahc,
+					  struct ahc_devinfo *dev);
+void			ahc_dump_card_state(struct ahc_softc *ahc);
+int			ahc_print_register(ahc_reg_parse_entry_t *table,
+					   u_int num_entries,
+					   const char *name,
+					   u_int address,
+					   u_int value,
+					   u_int *cur_column,
+					   u_int wrap_point);
+/******************************* SEEPROM *************************************/
+int		ahc_acquire_seeprom(struct ahc_softc *ahc,
+				    struct seeprom_descriptor *sd);
+void		ahc_release_seeprom(struct seeprom_descriptor *sd);
+#endif /* _AIC7XXX_H_ */