Linux-2.6.12-rc2v2.6.12-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, 7986 insertions, 0 deletions

diff --git a/drivers/scsi/ncr53c8xx.c b/drivers/scsi/ncr53c8xx.c
new file mode 100644
index 00000000000..7ae13236788
--- /dev/null
+++ b/drivers/scsi/ncr53c8xx.c
@@ -0,0 +1,7986 @@
+/******************************************************************************
+**  Device driver for the PCI-SCSI NCR538XX controller family.
+**
+**  Copyright (C) 1994  Wolfgang Stanglmeier
+**
+**  This program is free software; you can redistribute it and/or modify
+**  it under the terms of the GNU General Public License as published by
+**  the Free Software Foundation; either version 2 of the License, or
+**  (at your option) any later version.
+**
+**  This program is distributed in the hope that it will be useful,
+**  but WITHOUT ANY WARRANTY; without even the implied warranty of
+**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+**  GNU General Public License for more details.
+**
+**  You should have received a copy of the GNU General Public License
+**  along with this program; if not, write to the Free Software
+**  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+**
+**-----------------------------------------------------------------------------
+**
+**  This driver has been ported to Linux from the FreeBSD NCR53C8XX driver
+**  and is currently maintained by
+**
+**          Gerard Roudier              <groudier@free.fr>
+**
+**  Being given that this driver originates from the FreeBSD version, and
+**  in order to keep synergy on both, any suggested enhancements and corrections
+**  received on Linux are automatically a potential candidate for the FreeBSD 
+**  version.
+**
+**  The original driver has been written for 386bsd and FreeBSD by
+**          Wolfgang Stanglmeier        <wolf@cologne.de>
+**          Stefan Esser                <se@mi.Uni-Koeln.de>
+**
+**  And has been ported to NetBSD by
+**          Charles M. Hannum           <mycroft@gnu.ai.mit.edu>
+**
+**-----------------------------------------------------------------------------
+**
+**                     Brief history
+**
+**  December 10 1995 by Gerard Roudier:
+**     Initial port to Linux.
+**
+**  June 23 1996 by Gerard Roudier:
+**     Support for 64 bits architectures (Alpha).
+**
+**  November 30 1996 by Gerard Roudier:
+**     Support for Fast-20 scsi.
+**     Support for large DMA fifo and 128 dwords bursting.
+**
+**  February 27 1997 by Gerard Roudier:
+**     Support for Fast-40 scsi.
+**     Support for on-Board RAM.
+**
+**  May 3 1997 by Gerard Roudier:
+**     Full support for scsi scripts instructions pre-fetching.
+**
+**  May 19 1997 by Richard Waltham <dormouse@farsrobt.demon.co.uk>:
+**     Support for NvRAM detection and reading.
+**
+**  August 18 1997 by Cort <cort@cs.nmt.edu>:
+**     Support for Power/PC (Big Endian).
+**
+**  June 20 1998 by Gerard Roudier
+**     Support for up to 64 tags per lun.
+**     O(1) everywhere (C and SCRIPTS) for normal cases.
+**     Low PCI traffic for command handling when on-chip RAM is present.
+**     Aggressive SCSI SCRIPTS optimizations.
+**
+*******************************************************************************
+*/
+
+/*
+**	Supported SCSI-II features:
+**	    Synchronous negotiation
+**	    Wide negotiation        (depends on the NCR Chip)
+**	    Enable disconnection
+**	    Tagged command queuing
+**	    Parity checking
+**	    Etc...
+**
+**	Supported NCR/SYMBIOS chips:
+**		53C720		(Wide,   Fast SCSI-2, intfly problems)
+*/
+
+/* Name and version of the driver */
+#define SCSI_NCR_DRIVER_NAME	"ncr53c8xx-3.4.3g"
+
+#define SCSI_NCR_DEBUG_FLAGS	(0)
+
+/*==========================================================
+**
+**      Include files
+**
+**==========================================================
+*/
+
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/spinlock.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/time.h>
+#include <linux/timer.h>
+#include <linux/types.h>
+
+#include <asm/dma.h>
+#include <asm/io.h>
+#include <asm/system.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_transport_spi.h>
+
+#include "ncr53c8xx.h"
+
+#define NAME53C			"ncr53c"
+#define NAME53C8XX		"ncr53c8xx"
+
+#include "sym53c8xx_comm.h"
+
+
+/*==========================================================
+**
+**	The CCB done queue uses an array of CCB virtual 
+**	addresses. Empty entries are flagged using the bogus 
+**	virtual address 0xffffffff.
+**
+**	Since PCI ensures that only aligned DWORDs are accessed 
+**	atomically, 64 bit little-endian architecture requires 
+**	to test the high order DWORD of the entry to determine 
+**	if it is empty or valid.
+**
+**	BTW, I will make things differently as soon as I will 
+**	have a better idea, but this is simple and should work.
+**
+**==========================================================
+*/
+ 
+#define SCSI_NCR_CCB_DONE_SUPPORT
+#ifdef  SCSI_NCR_CCB_DONE_SUPPORT
+
+#define MAX_DONE 24
+#define CCB_DONE_EMPTY 0xffffffffUL
+
+/* All 32 bit architectures */
+#if BITS_PER_LONG == 32
+#define CCB_DONE_VALID(cp)  (((u_long) cp) != CCB_DONE_EMPTY)
+
+/* All > 32 bit (64 bit) architectures regardless endian-ness */
+#else
+#define CCB_DONE_VALID(cp)  \
+	((((u_long) cp) & 0xffffffff00000000ul) && 	\
+	 (((u_long) cp) & 0xfffffffful) != CCB_DONE_EMPTY)
+#endif
+
+#endif /* SCSI_NCR_CCB_DONE_SUPPORT */
+
+/*==========================================================
+**
+**	Configuration and Debugging
+**
+**==========================================================
+*/
+
+/*
+**    SCSI address of this device.
+**    The boot routines should have set it.
+**    If not, use this.
+*/
+
+#ifndef SCSI_NCR_MYADDR
+#define SCSI_NCR_MYADDR      (7)
+#endif
+
+/*
+**    The maximum number of tags per logic unit.
+**    Used only for disk devices that support tags.
+*/
+
+#ifndef SCSI_NCR_MAX_TAGS
+#define SCSI_NCR_MAX_TAGS    (8)
+#endif
+
+/*
+**    TAGS are actually limited to 64 tags/lun.
+**    We need to deal with power of 2, for alignment constraints.
+*/
+#if	SCSI_NCR_MAX_TAGS > 64
+#define	MAX_TAGS (64)
+#else
+#define	MAX_TAGS SCSI_NCR_MAX_TAGS
+#endif
+
+#define NO_TAG	(255)
+
+/*
+**	Choose appropriate type for tag bitmap.
+*/
+#if	MAX_TAGS > 32
+typedef u64 tagmap_t;
+#else
+typedef u32 tagmap_t;
+#endif
+
+/*
+**    Number of targets supported by the driver.
+**    n permits target numbers 0..n-1.
+**    Default is 16, meaning targets #0..#15.
+**    #7 .. is myself.
+*/
+
+#ifdef SCSI_NCR_MAX_TARGET
+#define MAX_TARGET  (SCSI_NCR_MAX_TARGET)
+#else
+#define MAX_TARGET  (16)
+#endif
+
+/*
+**    Number of logic units supported by the driver.
+**    n enables logic unit numbers 0..n-1.
+**    The common SCSI devices require only
+**    one lun, so take 1 as the default.
+*/
+
+#ifdef SCSI_NCR_MAX_LUN
+#define MAX_LUN    SCSI_NCR_MAX_LUN
+#else
+#define MAX_LUN    (1)
+#endif
+
+/*
+**    Asynchronous pre-scaler (ns). Shall be 40
+*/
+ 
+#ifndef SCSI_NCR_MIN_ASYNC
+#define SCSI_NCR_MIN_ASYNC (40)
+#endif
+
+/*
+**    The maximum number of jobs scheduled for starting.
+**    There should be one slot per target, and one slot
+**    for each tag of each target in use.
+**    The calculation below is actually quite silly ...
+*/
+
+#ifdef SCSI_NCR_CAN_QUEUE
+#define MAX_START   (SCSI_NCR_CAN_QUEUE + 4)
+#else
+#define MAX_START   (MAX_TARGET + 7 * MAX_TAGS)
+#endif
+
+/*
+**   We limit the max number of pending IO to 250.
+**   since we donnot want to allocate more than 1 
+**   PAGE for 'scripth'.
+*/
+#if	MAX_START > 250
+#undef	MAX_START
+#define	MAX_START 250
+#endif
+
+/*
+**    The maximum number of segments a transfer is split into.
+**    We support up to 127 segments for both read and write.
+**    The data scripts are broken into 2 sub-scripts.
+**    80 (MAX_SCATTERL) segments are moved from a sub-script
+**    in on-chip RAM. This makes data transfers shorter than 
+**    80k (assuming 1k fs) as fast as possible.
+*/
+
+#define MAX_SCATTER (SCSI_NCR_MAX_SCATTER)
+
+#if (MAX_SCATTER > 80)
+#define MAX_SCATTERL	80
+#define	MAX_SCATTERH	(MAX_SCATTER - MAX_SCATTERL)
+#else
+#define MAX_SCATTERL	(MAX_SCATTER-1)
+#define	MAX_SCATTERH	1
+#endif
+
+/*
+**	other
+*/
+
+#define NCR_SNOOP_TIMEOUT (1000000)
+
+/*
+**	Other definitions
+*/
+
+#define ScsiResult(host_code, scsi_code) (((host_code) << 16) + ((scsi_code) & 0x7f))
+
+#define initverbose (driver_setup.verbose)
+#define bootverbose (np->verbose)
+
+/*==========================================================
+**
+**	Command control block states.
+**
+**==========================================================
+*/
+
+#define HS_IDLE		(0)
+#define HS_BUSY		(1)
+#define HS_NEGOTIATE	(2)	/* sync/wide data transfer*/
+#define HS_DISCONNECT	(3)	/* Disconnected by target */
+
+#define HS_DONEMASK	(0x80)
+#define HS_COMPLETE	(4|HS_DONEMASK)
+#define HS_SEL_TIMEOUT	(5|HS_DONEMASK)	/* Selection timeout      */
+#define HS_RESET	(6|HS_DONEMASK)	/* SCSI reset	          */
+#define HS_ABORTED	(7|HS_DONEMASK)	/* Transfer aborted       */
+#define HS_TIMEOUT	(8|HS_DONEMASK)	/* Software timeout       */
+#define HS_FAIL		(9|HS_DONEMASK)	/* SCSI or PCI bus errors */
+#define HS_UNEXPECTED	(10|HS_DONEMASK)/* Unexpected disconnect  */
+
+/*
+**	Invalid host status values used by the SCRIPTS processor 
+**	when the nexus is not fully identified.
+**	Shall never appear in a CCB.
+*/
+
+#define HS_INVALMASK	(0x40)
+#define	HS_SELECTING	(0|HS_INVALMASK)
+#define	HS_IN_RESELECT	(1|HS_INVALMASK)
+#define	HS_STARTING	(2|HS_INVALMASK)
+
+/*
+**	Flags set by the SCRIPT processor for commands 
+**	that have been skipped.
+*/
+#define HS_SKIPMASK	(0x20)
+
+/*==========================================================
+**
+**	Software Interrupt Codes
+**
+**==========================================================
+*/
+
+#define	SIR_BAD_STATUS		(1)
+#define	SIR_XXXXXXXXXX		(2)
+#define	SIR_NEGO_SYNC		(3)
+#define	SIR_NEGO_WIDE		(4)
+#define	SIR_NEGO_FAILED		(5)
+#define	SIR_NEGO_PROTO		(6)
+#define	SIR_REJECT_RECEIVED	(7)
+#define	SIR_REJECT_SENT		(8)
+#define	SIR_IGN_RESIDUE		(9)
+#define	SIR_MISSING_SAVE	(10)
+#define	SIR_RESEL_NO_MSG_IN	(11)
+#define	SIR_RESEL_NO_IDENTIFY	(12)
+#define	SIR_RESEL_BAD_LUN	(13)
+#define	SIR_RESEL_BAD_TARGET	(14)
+#define	SIR_RESEL_BAD_I_T_L	(15)
+#define	SIR_RESEL_BAD_I_T_L_Q	(16)
+#define	SIR_DONE_OVERFLOW	(17)
+#define	SIR_INTFLY		(18)
+#define	SIR_MAX			(18)
+
+/*==========================================================
+**
+**	Extended error codes.
+**	xerr_status field of struct ccb.
+**
+**==========================================================
+*/
+
+#define	XE_OK		(0)
+#define	XE_EXTRA_DATA	(1)	/* unexpected data phase */
+#define	XE_BAD_PHASE	(2)	/* illegal phase (4/5)   */
+
+/*==========================================================
+**
+**	Negotiation status.
+**	nego_status field	of struct ccb.
+**
+**==========================================================
+*/
+
+#define NS_NOCHANGE	(0)
+#define NS_SYNC		(1)
+#define NS_WIDE		(2)
+#define NS_PPR		(4)
+
+/*==========================================================
+**
+**	Misc.
+**
+**==========================================================
+*/
+
+#define CCB_MAGIC	(0xf2691ad2)
+
+/*==========================================================
+**
+**	Declaration of structs.
+**
+**==========================================================
+*/
+
+static struct scsi_transport_template *ncr53c8xx_transport_template = NULL;
+
+struct tcb;
+struct lcb;
+struct ccb;
+struct ncb;
+struct script;
+
+struct link {
+	ncrcmd	l_cmd;
+	ncrcmd	l_paddr;
+};
+
+struct	usrcmd {
+	u_long	target;
+	u_long	lun;
+	u_long	data;
+	u_long	cmd;
+};
+
+#define UC_SETSYNC      10
+#define UC_SETTAGS	11
+#define UC_SETDEBUG	12
+#define UC_SETORDER	13
+#define UC_SETWIDE	14
+#define UC_SETFLAG	15
+#define UC_SETVERBOSE	17
+
+#define	UF_TRACE	(0x01)
+#define	UF_NODISC	(0x02)
+#define	UF_NOSCAN	(0x04)
+
+/*========================================================================
+**
+**	Declaration of structs:		target control block
+**
+**========================================================================
+*/
+struct tcb {
+	/*----------------------------------------------------------------
+	**	During reselection the ncr jumps to this point with SFBR 
+	**	set to the encoded target number with bit 7 set.
+	**	if it's not this target, jump to the next.
+	**
+	**	JUMP  IF (SFBR != #target#), @(next tcb)
+	**----------------------------------------------------------------
+	*/
+	struct link   jump_tcb;
+
+	/*----------------------------------------------------------------
+	**	Load the actual values for the sxfer and the scntl3
+	**	register (sync/wide mode).
+	**
+	**	SCR_COPY (1), @(sval field of this tcb), @(sxfer  register)
+	**	SCR_COPY (1), @(wval field of this tcb), @(scntl3 register)
+	**----------------------------------------------------------------
+	*/
+	ncrcmd	getscr[6];
+
+	/*----------------------------------------------------------------
+	**	Get the IDENTIFY message and load the LUN to SFBR.
+	**
+	**	CALL, <RESEL_LUN>
+	**----------------------------------------------------------------
+	*/
+	struct link   call_lun;
+
+	/*----------------------------------------------------------------
+	**	Now look for the right lun.
+	**
+	**	For i = 0 to 3
+	**		SCR_JUMP ^ IFTRUE(MASK(i, 3)), @(first lcb mod. i)
+	**
+	**	Recent chips will prefetch the 4 JUMPS using only 1 burst.
+	**	It is kind of hashcoding.
+	**----------------------------------------------------------------
+	*/
+	struct link     jump_lcb[4];	/* JUMPs for reselection	*/
+	struct lcb *	lp[MAX_LUN];	/* The lcb's of this tcb	*/
+
+	/*----------------------------------------------------------------
+	**	Pointer to the ccb used for negotiation.
+	**	Prevent from starting a negotiation for all queued commands 
+	**	when tagged command queuing is enabled.
+	**----------------------------------------------------------------
+	*/
+	struct ccb *   nego_cp;
+
+	/*----------------------------------------------------------------
+	**	statistical data
+	**----------------------------------------------------------------
+	*/
+	u_long	transfers;
+	u_long	bytes;
+
+	/*----------------------------------------------------------------
+	**	negotiation of wide and synch transfer and device quirks.
+	**----------------------------------------------------------------
+	*/
+#ifdef SCSI_NCR_BIG_ENDIAN
+/*0*/	u16	period;
+/*2*/	u_char	sval;
+/*3*/	u_char	minsync;
+/*0*/	u_char	wval;
+/*1*/	u_char	widedone;
+/*2*/	u_char	quirks;
+/*3*/	u_char	maxoffs;
+#else
+/*0*/	u_char	minsync;
+/*1*/	u_char	sval;
+/*2*/	u16	period;
+/*0*/	u_char	maxoffs;
+/*1*/	u_char	quirks;
+/*2*/	u_char	widedone;
+/*3*/	u_char	wval;
+#endif
+
+	/* User settable limits and options.  */
+	u_char	usrsync;
+	u_char	usrwide;
+	u_char	usrtags;
+	u_char	usrflag;
+	struct scsi_target *starget;
+};
+
+/*========================================================================
+**
+**	Declaration of structs:		lun control block
+**
+**========================================================================
+*/
+struct lcb {
+	/*----------------------------------------------------------------
+	**	During reselection the ncr jumps to this point
+	**	with SFBR set to the "Identify" message.
+	**	if it's not this lun, jump to the next.
+	**
+	**	JUMP  IF (SFBR != #lun#), @(next lcb of this target)
+	**
+	**	It is this lun. Load TEMP with the nexus jumps table 
+	**	address and jump to RESEL_TAG (or RESEL_NOTAG).
+	**
+	**		SCR_COPY (4), p_jump_ccb, TEMP,
+	**		SCR_JUMP, <RESEL_TAG>
+	**----------------------------------------------------------------
+	*/
+	struct link	jump_lcb;
+	ncrcmd		load_jump_ccb[3];
+	struct link	jump_tag;
+	ncrcmd		p_jump_ccb;	/* Jump table bus address	*/
+
+	/*----------------------------------------------------------------
+	**	Jump table used by the script processor to directly jump 
+	**	to the CCB corresponding to the reselected nexus.
+	**	Address is allocated on 256 bytes boundary in order to 
+	**	allow 8 bit calculation of the tag jump entry for up to 
+	**	64 possible tags.
+	**----------------------------------------------------------------
+	*/
+	u32		jump_ccb_0;	/* Default table if no tags	*/
+	u32		*jump_ccb;	/* Virtual address		*/
+
+	/*----------------------------------------------------------------
+	**	CCB queue management.
+	**----------------------------------------------------------------
+	*/
+	struct list_head free_ccbq;	/* Queue of available CCBs	*/
+	struct list_head busy_ccbq;	/* Queue of busy CCBs		*/
+	struct list_head wait_ccbq;	/* Queue of waiting for IO CCBs	*/
+	struct list_head skip_ccbq;	/* Queue of skipped CCBs	*/
+	u_char		actccbs;	/* Number of allocated CCBs	*/
+	u_char		busyccbs;	/* CCBs busy for this lun	*/
+	u_char		queuedccbs;	/* CCBs queued to the controller*/
+	u_char		queuedepth;	/* Queue depth for this lun	*/
+	u_char		scdev_depth;	/* SCSI device queue depth	*/
+	u_char		maxnxs;		/* Max possible nexuses		*/
+
+	/*----------------------------------------------------------------
+	**	Control of tagged command queuing.
+	**	Tags allocation is performed using a circular buffer.
+	**	This avoids using a loop for tag allocation.
+	**----------------------------------------------------------------
+	*/
+	u_char		ia_tag;		/* Allocation index		*/
+	u_char		if_tag;		/* Freeing index		*/
+	u_char cb_tags[MAX_TAGS];	/* Circular tags buffer	*/
+	u_char		usetags;	/* Command queuing is active	*/
+	u_char		maxtags;	/* Max nr of tags asked by user	*/
+	u_char		numtags;	/* Current number of tags	*/
+
+	/*----------------------------------------------------------------
+	**	QUEUE FULL control and ORDERED tag control.
+	**----------------------------------------------------------------
+	*/
+	/*----------------------------------------------------------------
+	**	QUEUE FULL and ORDERED tag control.
+	**----------------------------------------------------------------
+	*/
+	u16		num_good;	/* Nr of GOOD since QUEUE FULL	*/
+	tagmap_t	tags_umap;	/* Used tags bitmap		*/
+	tagmap_t	tags_smap;	/* Tags in use at 'tag_stime'	*/
+	u_long		tags_stime;	/* Last time we set smap=umap	*/
+	struct ccb *	held_ccb;	/* CCB held for QUEUE FULL	*/
+};
+
+/*========================================================================
+**
+**      Declaration of structs:     the launch script.
+**
+**========================================================================
+**
+**	It is part of the CCB and is called by the scripts processor to 
+**	start or restart the data structure (nexus).
+**	This 6 DWORDs mini script makes use of prefetching.
+**
+**------------------------------------------------------------------------
+*/
+struct launch {
+	/*----------------------------------------------------------------
+	**	SCR_COPY(4),	@(p_phys), @(dsa register)
+	**	SCR_JUMP,	@(scheduler_point)
+	**----------------------------------------------------------------
+	*/
+	ncrcmd		setup_dsa[3];	/* Copy 'phys' address to dsa	*/
+	struct link	schedule;	/* Jump to scheduler point	*/
+	ncrcmd		p_phys;		/* 'phys' header bus address	*/
+};
+
+/*========================================================================
+**
+**      Declaration of structs:     global HEADER.
+**
+**========================================================================
+**
+**	This substructure is copied from the ccb to a global address after 
+**	selection (or reselection) and copied back before disconnect.
+**
+**	These fields are accessible to the script processor.
+**
+**------------------------------------------------------------------------
+*/
+
+struct head {
+	/*----------------------------------------------------------------
+	**	Saved data pointer.
+	**	Points to the position in the script responsible for the
+	**	actual transfer transfer of data.
+	**	It's written after reception of a SAVE_DATA_POINTER message.
+	**	The goalpointer points after the last transfer command.
+	**----------------------------------------------------------------
+	*/
+	u32		savep;
+	u32		lastp;
+	u32		goalp;
+
+	/*----------------------------------------------------------------
+	**	Alternate data pointer.
+	**	They are copied back to savep/lastp/goalp by the SCRIPTS 
+	**	when the direction is unknown and the device claims data out.
+	**----------------------------------------------------------------
+	*/
+	u32		wlastp;
+	u32		wgoalp;
+
+	/*----------------------------------------------------------------
+	**	The virtual address of the ccb containing this header.
+	**----------------------------------------------------------------
+	*/
+	struct ccb *	cp;
+
+	/*----------------------------------------------------------------
+	**	Status fields.
+	**----------------------------------------------------------------
+	*/
+	u_char		scr_st[4];	/* script status		*/
+	u_char		status[4];	/* host status. must be the 	*/
+					/*  last DWORD of the header.	*/
+};
+
+/*
+**	The status bytes are used by the host and the script processor.
+**
+**	The byte corresponding to the host_status must be stored in the 
+**	last DWORD of the CCB header since it is used for command 
+**	completion (ncr_wakeup()). Doing so, we are sure that the header 
+**	has been entirely copied back to the CCB when the host_status is 
+**	seen complete by the CPU.
+**
+**	The last four bytes (status[4]) are copied to the scratchb register
+**	(declared as scr0..scr3 in ncr_reg.h) just after the select/reselect,
+**	and copied back just after disconnecting.
+**	Inside the script the XX_REG are used.
+**
+**	The first four bytes (scr_st[4]) are used inside the script by 
+**	"COPY" commands.
+**	Because source and destination must have the same alignment
+**	in a DWORD, the fields HAVE to be at the choosen offsets.
+**		xerr_st		0	(0x34)	scratcha
+**		sync_st		1	(0x05)	sxfer
+**		wide_st		3	(0x03)	scntl3
+*/
+
+/*
+**	Last four bytes (script)
+*/
+#define  QU_REG	scr0
+#define  HS_REG	scr1
+#define  HS_PRT	nc_scr1
+#define  SS_REG	scr2
+#define  SS_PRT	nc_scr2
+#define  PS_REG	scr3
+
+/*
+**	Last four bytes (host)
+*/
+#ifdef SCSI_NCR_BIG_ENDIAN
+#define  actualquirks  phys.header.status[3]
+#define  host_status   phys.header.status[2]
+#define  scsi_status   phys.header.status[1]
+#define  parity_status phys.header.status[0]
+#else
+#define  actualquirks  phys.header.status[0]
+#define  host_status   phys.header.status[1]
+#define  scsi_status   phys.header.status[2]
+#define  parity_status phys.header.status[3]
+#endif
+
+/*
+**	First four bytes (script)
+*/
+#define  xerr_st       header.scr_st[0]
+#define  sync_st       header.scr_st[1]
+#define  nego_st       header.scr_st[2]
+#define  wide_st       header.scr_st[3]
+
+/*
+**	First four bytes (host)
+*/
+#define  xerr_status   phys.xerr_st
+#define  nego_status   phys.nego_st
+
+#if 0
+#define  sync_status   phys.sync_st
+#define  wide_status   phys.wide_st
+#endif
+
+/*==========================================================
+**
+**      Declaration of structs:     Data structure block
+**
+**==========================================================
+**
+**	During execution of a ccb by the script processor,
+**	the DSA (data structure address) register points
+**	to this substructure of the ccb.
+**	This substructure contains the header with
+**	the script-processor-changable data and
+**	data blocks for the indirect move commands.
+**
+**----------------------------------------------------------
+*/
+
+struct dsb {
+
+	/*
+	**	Header.
+	*/
+
+	struct head	header;
+
+	/*
+	**	Table data for Script
+	*/
+
+	struct scr_tblsel  select;
+	struct scr_tblmove smsg  ;
+	struct scr_tblmove cmd   ;
+	struct scr_tblmove sense ;
+	struct scr_tblmove data[MAX_SCATTER];
+};
+
+
+/*========================================================================
+**
+**      Declaration of structs:     Command control block.
+**
+**========================================================================
+*/
+struct ccb {
+	/*----------------------------------------------------------------
+	**	This is the data structure which is pointed by the DSA 
+	**	register when it is executed by the script processor.
+	**	It must be the first entry because it contains the header 
+	**	as first entry that must be cache line aligned.
+	**----------------------------------------------------------------
+	*/
+	struct dsb	phys;
+
+	/*----------------------------------------------------------------
+	**	Mini-script used at CCB execution start-up.
+	**	Load the DSA with the data structure address (phys) and 
+	**	jump to SELECT. Jump to CANCEL if CCB is to be canceled.
+	**----------------------------------------------------------------
+	*/
+	struct launch	start;
+
+	/*----------------------------------------------------------------
+	**	Mini-script used at CCB relection to restart the nexus.
+	**	Load the DSA with the data structure address (phys) and 
+	**	jump to RESEL_DSA. Jump to ABORT if CCB is to be aborted.
+	**----------------------------------------------------------------
+	*/
+	struct launch	restart;
+
+	/*----------------------------------------------------------------
+	**	If a data transfer phase is terminated too early
+	**	(after reception of a message (i.e. DISCONNECT)),
+	**	we have to prepare a mini script to transfer
+	**	the rest of the data.
+	**----------------------------------------------------------------
+	*/
+	ncrcmd		patch[8];
+
+	/*----------------------------------------------------------------
+	**	The general SCSI driver provides a
+	**	pointer to a control block.
+	**----------------------------------------------------------------
+	*/
+	struct scsi_cmnd	*cmd;		/* SCSI command 		*/
+	u_char		cdb_buf[16];	/* Copy of CDB			*/
+	u_char		sense_buf[64];
+	int		data_len;	/* Total data length		*/
+
+	/*----------------------------------------------------------------
+	**	Message areas.
+	**	We prepare a message to be sent after selection.
+	**	We may use a second one if the command is rescheduled 
+	**	due to GETCC or QFULL.
+	**      Contents are IDENTIFY and SIMPLE_TAG.
+	**	While negotiating sync or wide transfer,
+	**	a SDTR or WDTR message is appended.
+	**----------------------------------------------------------------
+	*/
+	u_char		scsi_smsg [8];
+	u_char		scsi_smsg2[8];
+
+	/*----------------------------------------------------------------
+	**	Other fields.
+	**----------------------------------------------------------------
+	*/
+	u_long		p_ccb;		/* BUS address of this CCB	*/
+	u_char		sensecmd[6];	/* Sense command		*/
+	u_char		tag;		/* Tag for this transfer	*/
+					/*  255 means no tag		*/
+	u_char		target;
+	u_char		lun;
+	u_char		queued;
+	u_char		auto_sense;
+	struct ccb *	link_ccb;	/* Host adapter CCB chain	*/
+	struct list_head link_ccbq;	/* Link to unit CCB queue	*/
+	u32		startp;		/* Initial data pointer		*/
+	u_long		magic;		/* Free / busy  CCB flag	*/
+};
+
+#define CCB_PHYS(cp,lbl)	(cp->p_ccb + offsetof(struct ccb, lbl))
+
+
+/*========================================================================
+**
+**      Declaration of structs:     NCR device descriptor
+**
+**========================================================================
+*/
+struct ncb {
+	/*----------------------------------------------------------------
+	**	The global header.
+	**	It is accessible to both the host and the script processor.
+	**	Must be cache line size aligned (32 for x86) in order to 
+	**	allow cache line bursting when it is copied to/from CCB.
+	**----------------------------------------------------------------
+	*/
+	struct head     header;
+
+	/*----------------------------------------------------------------
+	**	CCBs management queues.
+	**----------------------------------------------------------------
+	*/
+	struct scsi_cmnd	*waiting_list;	/* Commands waiting for a CCB	*/
+					/*  when lcb is not allocated.	*/
+	struct scsi_cmnd	*done_list;	/* Commands waiting for done()  */
+					/* callback to be invoked.      */ 
+	spinlock_t	smp_lock;	/* Lock for SMP threading       */
+
+	/*----------------------------------------------------------------
+	**	Chip and controller indentification.
+	**----------------------------------------------------------------
+	*/
+	int		unit;		/* Unit number			*/
+	char		inst_name[16];	/* ncb instance name		*/
+
+	/*----------------------------------------------------------------
+	**	Initial value of some IO register bits.
+	**	These values are assumed to have been set by BIOS, and may 
+	**	be used for probing adapter implementation differences.
+	**----------------------------------------------------------------
+	*/
+	u_char	sv_scntl0, sv_scntl3, sv_dmode, sv_dcntl, sv_ctest0, sv_ctest3,
+		sv_ctest4, sv_ctest5, sv_gpcntl, sv_stest2, sv_stest4;
+
+	/*----------------------------------------------------------------
+	**	Actual initial value of IO register bits used by the 
+	**	driver. They are loaded at initialisation according to  
+	**	features that are to be enabled.
+	**----------------------------------------------------------------
+	*/
+	u_char	rv_scntl0, rv_scntl3, rv_dmode, rv_dcntl, rv_ctest0, rv_ctest3,
+		rv_ctest4, rv_ctest5, rv_stest2;
+
+	/*----------------------------------------------------------------
+	**	Targets management.
+	**	During reselection the ncr jumps to jump_tcb.
+	**	The SFBR register is loaded with the encoded target id.
+	**	For i = 0 to 3
+	**		SCR_JUMP ^ IFTRUE(MASK(i, 3)), @(next tcb mod. i)
+	**
+	**	Recent chips will prefetch the 4 JUMPS using only 1 burst.
+	**	It is kind of hashcoding.
+	**----------------------------------------------------------------
+	*/
+	struct link     jump_tcb[4];	/* JUMPs for reselection	*/
+	struct tcb  target[MAX_TARGET];	/* Target data			*/
+
+	/*----------------------------------------------------------------
+	**	Virtual and physical bus addresses of the chip.
+	**----------------------------------------------------------------
+	*/
+	void __iomem *vaddr;		/* Virtual and bus address of	*/
+	unsigned long	paddr;		/*  chip's IO registers.	*/
+	unsigned long	paddr2;		/* On-chip RAM bus address.	*/
+	volatile			/* Pointer to volatile for 	*/
+	struct ncr_reg	__iomem *reg;	/*  memory mapped IO.		*/
+
+	/*----------------------------------------------------------------
+	**	SCRIPTS virtual and physical bus addresses.
+	**	'script'  is loaded in the on-chip RAM if present.
+	**	'scripth' stays in main memory.
+	**----------------------------------------------------------------
+	*/
+	struct script	*script0;	/* Copies of script and scripth	*/
+	struct scripth	*scripth0;	/*  relocated for this ncb.	*/
+	struct scripth	*scripth;	/* Actual scripth virt. address	*/
+	u_long		p_script;	/* Actual script and scripth	*/
+	u_long		p_scripth;	/*  bus addresses.		*/
+
+	/*----------------------------------------------------------------
+	**	General controller parameters and configuration.
+	**----------------------------------------------------------------
+	*/
+	struct device	*dev;
+	u_char		revision_id;	/* PCI device revision id	*/
+	u32		irq;		/* IRQ level			*/
+	u32		features;	/* Chip features map		*/
+	u_char		myaddr;		/* SCSI id of the adapter	*/
+	u_char		maxburst;	/* log base 2 of dwords burst	*/
+	u_char		maxwide;	/* Maximum transfer width	*/
+	u_char		minsync;	/* Minimum sync period factor	*/
+	u_char		maxsync;	/* Maximum sync period factor	*/
+	u_char		maxoffs;	/* Max scsi offset		*/
+	u_char		multiplier;	/* Clock multiplier (1,2,4)	*/
+	u_char		clock_divn;	/* Number of clock divisors	*/
+	u_long		clock_khz;	/* SCSI clock frequency in KHz	*/
+
+	/*----------------------------------------------------------------
+	**	Start queue management.
+	**	It is filled up by the host processor and accessed by the 
+	**	SCRIPTS processor in order to start SCSI commands.
+	**----------------------------------------------------------------
+	*/
+	u16		squeueput;	/* Next free slot of the queue	*/
+	u16		actccbs;	/* Number of allocated CCBs	*/
+	u16		queuedccbs;	/* Number of CCBs in start queue*/
+	u16		queuedepth;	/* Start queue depth		*/
+
+	/*----------------------------------------------------------------
+	**	Timeout handler.
+	**----------------------------------------------------------------
+	*/
+	struct timer_list timer;	/* Timer handler link header	*/
+	u_long		lasttime;
+	u_long		settle_time;	/* Resetting the SCSI BUS	*/
+
+	/*----------------------------------------------------------------
+	**	Debugging and profiling.
+	**----------------------------------------------------------------
+	*/
+	struct ncr_reg	regdump;	/* Register dump		*/
+	u_long		regtime;	/* Time it has been done	*/
+
+	/*----------------------------------------------------------------
+	**	Miscellaneous buffers accessed by the scripts-processor.
+	**	They shall be DWORD aligned, because they may be read or 
+	**	written with a SCR_COPY script command.
+	**----------------------------------------------------------------
+	*/
+	u_char		msgout[8];	/* Buffer for MESSAGE OUT 	*/
+	u_char		msgin [8];	/* Buffer for MESSAGE IN	*/
+	u32		lastmsg;	/* Last SCSI message sent	*/
+	u_char		scratch;	/* Scratch for SCSI receive	*/
+
+	/*----------------------------------------------------------------
+	**	Miscellaneous configuration and status parameters.
+	**----------------------------------------------------------------
+	*/
+	u_char		disc;		/* Diconnection allowed		*/
+	u_char		scsi_mode;	/* Current SCSI BUS mode	*/
+	u_char		order;		/* Tag order to use		*/
+	u_char		verbose;	/* Verbosity for this controller*/
+	int		ncr_cache;	/* Used for cache test at init.	*/
+	u_long		p_ncb;		/* BUS address of this NCB	*/
+
+	/*----------------------------------------------------------------
+	**	Command completion handling.
+	**----------------------------------------------------------------
+	*/
+#ifdef SCSI_NCR_CCB_DONE_SUPPORT
+	struct ccb	*(ccb_done[MAX_DONE]);
+	int		ccb_done_ic;
+#endif
+	/*----------------------------------------------------------------
+	**	Fields that should be removed or changed.
+	**----------------------------------------------------------------
+	*/
+	struct ccb	*ccb;		/* Global CCB			*/
+	struct usrcmd	user;		/* Command from user		*/
+	volatile u_char	release_stage;	/* Synchronisation stage on release  */
+};
+
+#define NCB_SCRIPT_PHYS(np,lbl)	 (np->p_script  + offsetof (struct script, lbl))
+#define NCB_SCRIPTH_PHYS(np,lbl) (np->p_scripth + offsetof (struct scripth,lbl))
+
+/*==========================================================
+**
+**
+**      Script for NCR-Processor.
+**
+**	Use ncr_script_fill() to create the variable parts.
+**	Use ncr_script_copy_and_bind() to make a copy and
+**	bind to physical addresses.