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, 1304 insertions, 0 deletions

diff --git a/drivers/scsi/sym53c8xx_2/sym_hipd.h b/drivers/scsi/sym53c8xx_2/sym_hipd.h
new file mode 100644
index 000000000000..a95cbe4b8e39
--- /dev/null
+++ b/drivers/scsi/sym53c8xx_2/sym_hipd.h
@@ -0,0 +1,1304 @@
+/*
+ * Device driver for the SYMBIOS/LSILOGIC 53C8XX and 53C1010 family 
+ * of PCI-SCSI IO processors.
+ *
+ * Copyright (C) 1999-2001  Gerard Roudier <groudier@free.fr>
+ *
+ * This driver is derived from the Linux sym53c8xx driver.
+ * Copyright (C) 1998-2000  Gerard Roudier
+ *
+ * The sym53c8xx driver is derived from the ncr53c8xx driver that had been 
+ * a port of the FreeBSD ncr driver to Linux-1.2.13.
+ *
+ * The original ncr driver has been written for 386bsd and FreeBSD by
+ *         Wolfgang Stanglmeier        <wolf@cologne.de>
+ *         Stefan Esser                <se@mi.Uni-Koeln.de>
+ * Copyright (C) 1994  Wolfgang Stanglmeier
+ *
+ * Other major contributions:
+ *
+ * NVRAM detection and reading.
+ * Copyright (C) 1997 Richard Waltham <dormouse@farsrobt.demon.co.uk>
+ *
+ *-----------------------------------------------------------------------------
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef SYM_HIPD_H
+#define SYM_HIPD_H
+
+/*
+ *  Generic driver options.
+ *
+ *  They may be defined in platform specific headers, if they 
+ *  are useful.
+ *
+ *    SYM_OPT_HANDLE_DIR_UNKNOWN
+ *        When this option is set, the SCRIPTS used by the driver 
+ *        are able to handle SCSI transfers with direction not 
+ *        supplied by user.
+ *        (set for Linux-2.0.X)
+ *
+ *    SYM_OPT_HANDLE_DEVICE_QUEUEING
+ *        When this option is set, the driver will use a queue per 
+ *        device and handle QUEUE FULL status requeuing internally.
+ *
+ *    SYM_OPT_LIMIT_COMMAND_REORDERING
+ *        When this option is set, the driver tries to limit tagged 
+ *        command reordering to some reasonnable value.
+ *        (set for Linux)
+ */
+#if 0
+#define SYM_OPT_HANDLE_DIR_UNKNOWN
+#define SYM_OPT_HANDLE_DEVICE_QUEUEING
+#define SYM_OPT_LIMIT_COMMAND_REORDERING
+#endif
+
+/*
+ *  Active debugging tags and verbosity.
+ *  Both DEBUG_FLAGS and sym_verbose can be redefined 
+ *  by the platform specific code to something else.
+ */
+#define DEBUG_ALLOC	(0x0001)
+#define DEBUG_PHASE	(0x0002)
+#define DEBUG_POLL	(0x0004)
+#define DEBUG_QUEUE	(0x0008)
+#define DEBUG_RESULT	(0x0010)
+#define DEBUG_SCATTER	(0x0020)
+#define DEBUG_SCRIPT	(0x0040)
+#define DEBUG_TINY	(0x0080)
+#define DEBUG_TIMING	(0x0100)
+#define DEBUG_NEGO	(0x0200)
+#define DEBUG_TAGS	(0x0400)
+#define DEBUG_POINTER	(0x0800)
+
+#ifndef DEBUG_FLAGS
+#define DEBUG_FLAGS	(0x0000)
+#endif
+
+#ifndef sym_verbose
+#define sym_verbose	(np->verbose)
+#endif
+
+/*
+ *  These ones should have been already defined.
+ */
+#ifndef assert
+#define	assert(expression) { \
+	if (!(expression)) { \
+		(void)panic( \
+			"assertion \"%s\" failed: file \"%s\", line %d\n", \
+			#expression, \
+			__FILE__, __LINE__); \
+	} \
+}
+#endif
+
+/*
+ *  Number of tasks per device we want to handle.
+ */
+#if	SYM_CONF_MAX_TAG_ORDER > 8
+#error	"more than 256 tags per logical unit not allowed."
+#endif
+#define	SYM_CONF_MAX_TASK	(1<<SYM_CONF_MAX_TAG_ORDER)
+
+/*
+ *  Donnot use more tasks that we can handle.
+ */
+#ifndef	SYM_CONF_MAX_TAG
+#define	SYM_CONF_MAX_TAG	SYM_CONF_MAX_TASK
+#endif
+#if	SYM_CONF_MAX_TAG > SYM_CONF_MAX_TASK
+#undef	SYM_CONF_MAX_TAG
+#define	SYM_CONF_MAX_TAG	SYM_CONF_MAX_TASK
+#endif
+
+/*
+ *    This one means 'NO TAG for this job'
+ */
+#define NO_TAG	(256)
+
+/*
+ *  Number of SCSI targets.
+ */
+#if	SYM_CONF_MAX_TARGET > 16
+#error	"more than 16 targets not allowed."
+#endif
+
+/*
+ *  Number of logical units per target.
+ */
+#if	SYM_CONF_MAX_LUN > 64
+#error	"more than 64 logical units per target not allowed."
+#endif
+
+/*
+ *    Asynchronous pre-scaler (ns). Shall be 40 for 
+ *    the SCSI timings to be compliant.
+ */
+#define	SYM_CONF_MIN_ASYNC (40)
+
+/*
+ *  Shortest memory chunk is (1<<SYM_MEM_SHIFT), currently 16.
+ *  Actual allocations happen as SYM_MEM_CLUSTER_SIZE sized.
+ *  (1 PAGE at a time is just fine).
+ */
+#define SYM_MEM_SHIFT	4
+#define SYM_MEM_CLUSTER_SIZE	(1UL << SYM_MEM_CLUSTER_SHIFT)
+#define SYM_MEM_CLUSTER_MASK	(SYM_MEM_CLUSTER_SIZE-1)
+
+/*
+ *  Number of entries in the START and DONE queues.
+ *
+ *  We limit to 1 PAGE in order to succeed allocation of 
+ *  these queues. Each entry is 8 bytes long (2 DWORDS).
+ */
+#ifdef	SYM_CONF_MAX_START
+#define	SYM_CONF_MAX_QUEUE (SYM_CONF_MAX_START+2)
+#else
+#define	SYM_CONF_MAX_QUEUE (7*SYM_CONF_MAX_TASK+2)
+#define	SYM_CONF_MAX_START (SYM_CONF_MAX_QUEUE-2)
+#endif
+
+#if	SYM_CONF_MAX_QUEUE > SYM_MEM_CLUSTER_SIZE/8
+#undef	SYM_CONF_MAX_QUEUE
+#define	SYM_CONF_MAX_QUEUE (SYM_MEM_CLUSTER_SIZE/8)
+#undef	SYM_CONF_MAX_START
+#define	SYM_CONF_MAX_START (SYM_CONF_MAX_QUEUE-2)
+#endif
+
+/*
+ *  For this one, we want a short name :-)
+ */
+#define MAX_QUEUE	SYM_CONF_MAX_QUEUE
+
+/*
+ *  Common definitions for both bus space based and legacy IO methods.
+ */
+
+#define INB_OFF(np, o)		ioread8(np->s.ioaddr + (o))
+#define INW_OFF(np, o)		ioread16(np->s.ioaddr + (o))
+#define INL_OFF(np, o)		ioread32(np->s.ioaddr + (o))
+
+#define OUTB_OFF(np, o, val)	iowrite8((val), np->s.ioaddr + (o))
+#define OUTW_OFF(np, o, val)	iowrite16((val), np->s.ioaddr + (o))
+#define OUTL_OFF(np, o, val)	iowrite32((val), np->s.ioaddr + (o))
+
+#define INB(np, r)		INB_OFF(np, offsetof(struct sym_reg, r))
+#define INW(np, r)		INW_OFF(np, offsetof(struct sym_reg, r))
+#define INL(np, r)		INL_OFF(np, offsetof(struct sym_reg, r))
+
+#define OUTB(np, r, v)		OUTB_OFF(np, offsetof(struct sym_reg, r), (v))
+#define OUTW(np, r, v)		OUTW_OFF(np, offsetof(struct sym_reg, r), (v))
+#define OUTL(np, r, v)		OUTL_OFF(np, offsetof(struct sym_reg, r), (v))
+
+#define OUTONB(np, r, m)	OUTB(np, r, INB(np, r) | (m))
+#define OUTOFFB(np, r, m)	OUTB(np, r, INB(np, r) & ~(m))
+#define OUTONW(np, r, m)	OUTW(np, r, INW(np, r) | (m))
+#define OUTOFFW(np, r, m)	OUTW(np, r, INW(np, r) & ~(m))
+#define OUTONL(np, r, m)	OUTL(np, r, INL(np, r) | (m))
+#define OUTOFFL(np, r, m)	OUTL(np, r, INL(np, r) & ~(m))
+
+/*
+ *  We normally want the chip to have a consistent view
+ *  of driver internal data structures when we restart it.
+ *  Thus these macros.
+ */
+#define OUTL_DSP(np, v)				\
+	do {					\
+		MEMORY_WRITE_BARRIER();		\
+		OUTL(np, nc_dsp, (v));		\
+	} while (0)
+
+#define OUTONB_STD()				\
+	do {					\
+		MEMORY_WRITE_BARRIER();		\
+		OUTONB(np, nc_dcntl, (STD|NOCOM));	\
+	} while (0)
+
+/*
+ *  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_WAIT		(4)	/* waiting for resource	  */
+
+#define HS_DONEMASK	(0x80)
+#define HS_COMPLETE	(4|HS_DONEMASK)
+#define HS_SEL_TIMEOUT	(5|HS_DONEMASK)	/* Selection timeout      */
+#define HS_UNEXPECTED	(6|HS_DONEMASK)	/* Unexpected disconnect  */
+#define HS_COMP_ERR	(7|HS_DONEMASK)	/* Completed with error	  */
+
+/*
+ *  Software Interrupt Codes
+ */
+#define	SIR_BAD_SCSI_STATUS	(1)
+#define	SIR_SEL_ATN_NO_MSG_OUT	(2)
+#define	SIR_MSG_RECEIVED	(3)
+#define	SIR_MSG_WEIRD		(4)
+#define	SIR_NEGO_FAILED		(5)
+#define	SIR_NEGO_PROTO		(6)
+#define	SIR_SCRIPT_STOPPED	(7)
+#define	SIR_REJECT_TO_SEND	(8)
+#define	SIR_SWIDE_OVERRUN	(9)
+#define	SIR_SODL_UNDERRUN	(10)
+#define	SIR_RESEL_NO_MSG_IN	(11)
+#define	SIR_RESEL_NO_IDENTIFY	(12)
+#define	SIR_RESEL_BAD_LUN	(13)
+#define	SIR_TARGET_SELECTED	(14)
+#define	SIR_RESEL_BAD_I_T_L	(15)
+#define	SIR_RESEL_BAD_I_T_L_Q	(16)
+#define	SIR_ABORT_SENT		(17)
+#define	SIR_RESEL_ABORTED	(18)
+#define	SIR_MSG_OUT_DONE	(19)
+#define	SIR_COMPLETE_ERROR	(20)
+#define	SIR_DATA_OVERRUN	(21)
+#define	SIR_BAD_PHASE		(22)
+#if	SYM_CONF_DMA_ADDRESSING_MODE == 2
+#define	SIR_DMAP_DIRTY		(23)
+#define	SIR_MAX			(23)
+#else
+#define	SIR_MAX			(22)
+#endif
+
+/*
+ *  Extended error bit codes.
+ *  xerr_status field of struct sym_ccb.
+ */
+#define	XE_EXTRA_DATA	(1)	/* unexpected data phase	 */
+#define	XE_BAD_PHASE	(1<<1)	/* illegal phase (4/5)		 */
+#define	XE_PARITY_ERR	(1<<2)	/* unrecovered SCSI parity error */
+#define	XE_SODL_UNRUN	(1<<3)	/* ODD transfer in DATA OUT phase */
+#define	XE_SWIDE_OVRUN	(1<<4)	/* ODD transfer in DATA IN phase */
+
+/*
+ *  Negotiation status.
+ *  nego_status field of struct sym_ccb.
+ */
+#define NS_SYNC		(1)
+#define NS_WIDE		(2)
+#define NS_PPR		(3)
+
+/*
+ *  A CCB hashed table is used to retrieve CCB address 
+ *  from DSA value.
+ */
+#define CCB_HASH_SHIFT		8
+#define CCB_HASH_SIZE		(1UL << CCB_HASH_SHIFT)
+#define CCB_HASH_MASK		(CCB_HASH_SIZE-1)
+#if 1
+#define CCB_HASH_CODE(dsa)	\
+	(((dsa) >> (_LGRU16_(sizeof(struct sym_ccb)))) & CCB_HASH_MASK)
+#else
+#define CCB_HASH_CODE(dsa)	(((dsa) >> 9) & CCB_HASH_MASK)
+#endif
+
+#if	SYM_CONF_DMA_ADDRESSING_MODE == 2
+/*
+ *  We may want to use segment registers for 64 bit DMA.
+ *  16 segments registers -> up to 64 GB addressable.
+ */
+#define SYM_DMAP_SHIFT	(4)
+#define SYM_DMAP_SIZE	(1u<<SYM_DMAP_SHIFT)
+#define SYM_DMAP_MASK	(SYM_DMAP_SIZE-1)
+#endif
+
+/*
+ *  Device flags.
+ */
+#define SYM_DISC_ENABLED	(1)
+#define SYM_TAGS_ENABLED	(1<<1)
+#define SYM_SCAN_BOOT_DISABLED	(1<<2)
+#define SYM_SCAN_LUNS_DISABLED	(1<<3)
+
+/*
+ *  Host adapter miscellaneous flags.
+ */
+#define SYM_AVOID_BUS_RESET	(1)
+
+/*
+ *  Misc.
+ */
+#define SYM_SNOOP_TIMEOUT (10000000)
+#define BUS_8_BIT	0
+#define BUS_16_BIT	1
+
+/*
+ *  Gather negotiable parameters value
+ */
+struct sym_trans {
+	u8 period;
+	u8 offset;
+	unsigned int width:1;
+	unsigned int iu:1;
+	unsigned int dt:1;
+	unsigned int qas:1;
+	unsigned int check_nego:1;
+};
+
+/*
+ *  Global TCB HEADER.
+ *
+ *  Due to lack of indirect addressing on earlier NCR chips,
+ *  this substructure is copied from the TCB to a global 
+ *  address after selection.
+ *  For SYMBIOS chips that support LOAD/STORE this copy is 
+ *  not needed and thus not performed.
+ */
+struct sym_tcbh {
+	/*
+	 *  Scripts bus addresses of LUN table accessed from scripts.
+	 *  LUN #0 is a special case, since multi-lun devices are rare, 
+	 *  and we we want to speed-up the general case and not waste 
+	 *  resources.
+	 */
+	u32	luntbl_sa;	/* bus address of this table	*/
+	u32	lun0_sa;	/* bus address of LCB #0	*/
+	/*
+	 *  Actual SYNC/WIDE IO registers value for this target.
+	 *  'sval', 'wval' and 'uval' are read from SCRIPTS and 
+	 *  so have alignment constraints.
+	 */
+/*0*/	u_char	uval;		/* -> SCNTL4 register		*/
+/*1*/	u_char	sval;		/* -> SXFER  io register	*/
+/*2*/	u_char	filler1;
+/*3*/	u_char	wval;		/* -> SCNTL3 io register	*/
+};
+
+/*
+ *  Target Control Block
+ */
+struct sym_tcb {
+	/*
+	 *  TCB header.
+	 *  Assumed at offset 0.
+	 */
+/*0*/	struct sym_tcbh head;
+
+	/*
+	 *  LUN table used by the SCRIPTS processor.
+	 *  An array of bus addresses is used on reselection.
+	 */
+	u32	*luntbl;	/* LCBs bus address table	*/
+
+	/*
+	 *  LUN table used by the C code.
+	 */
+	struct sym_lcb *lun0p;		/* LCB of LUN #0 (usual case)	*/
+#if SYM_CONF_MAX_LUN > 1
+	struct sym_lcb **lunmp;		/* Other LCBs [1..MAX_LUN]	*/
+#endif
+
+	/*
+	 *  Bitmap that tells about LUNs that succeeded at least 
+	 *  1 IO and therefore assumed to be a real device.
+	 *  Avoid useless allocation of the LCB structure.
+	 */
+	u32	lun_map[(SYM_CONF_MAX_LUN+31)/32];
+
+	/*
+	 *  Bitmap that tells about LUNs that haven't yet an LCB 
+	 *  allocated (not discovered or LCB allocation failed).
+	 */
+	u32	busy0_map[(SYM_CONF_MAX_LUN+31)/32];
+
+#ifdef	SYM_HAVE_STCB
+	/*
+	 *  O/S specific data structure.
+	 */
+	struct sym_stcb s;
+#endif
+
+	/* Transfer goal */
+	struct sym_trans tgoal;
+
+	/*
+	 * Keep track of the CCB used for the negotiation in order
+	 * to ensure that only 1 negotiation is queued at a time.
+	 */
+	struct sym_ccb *  nego_cp;	/* CCB used for the nego		*/
+
+	/*
+	 *  Set when we want to reset the device.
+	 */
+	u_char	to_reset;
+
+	/*
+	 *  Other user settable limits and options.
+	 *  These limits are read from the NVRAM if present.
+	 */
+	u_char	usrflags;
+	u_short	usrtags;
+	struct scsi_device *sdev;
+};
+
+/*
+ *  Global LCB HEADER.
+ *
+ *  Due to lack of indirect addressing on earlier NCR chips,
+ *  this substructure is copied from the LCB to a global 
+ *  address after selection.
+ *  For SYMBIOS chips that support LOAD/STORE this copy is 
+ *  not needed and thus not performed.
+ */
+struct sym_lcbh {
+	/*
+	 *  SCRIPTS address jumped by SCRIPTS on reselection.
+	 *  For not probed logical units, this address points to 
+	 *  SCRIPTS that deal with bad LU handling (must be at 
+	 *  offset zero of the LCB for that reason).
+	 */
+/*0*/	u32	resel_sa;
+
+	/*
+	 *  Task (bus address of a CCB) read from SCRIPTS that points 
+	 *  to the unique ITL nexus allowed to be disconnected.
+	 */
+	u32	itl_task_sa;
+
+	/*
+	 *  Task table bus address (read from SCRIPTS).
+	 */
+	u32	itlq_tbl_sa;
+};
+
+/*
+ *  Logical Unit Control Block
+ */
+struct sym_lcb {
+	/*
+	 *  TCB header.
+	 *  Assumed at offset 0.
+	 */
+/*0*/	struct sym_lcbh head;
+
+	/*
+	 *  Task table read from SCRIPTS that contains pointers to 
+	 *  ITLQ nexuses. The bus address read from SCRIPTS is 
+	 *  inside the header.
+	 */
+	u32	*itlq_tbl;	/* Kernel virtual address	*/
+
+	/*
+	 *  Busy CCBs management.
+	 */
+	u_short	busy_itlq;	/* Number of busy tagged CCBs	*/
+	u_short	busy_itl;	/* Number of busy untagged CCBs	*/
+
+	/*
+	 *  Circular tag allocation buffer.
+	 */
+	u_short	ia_tag;		/* Tag allocation index		*/
+	u_short	if_tag;		/* Tag release index		*/
+	u_char	*cb_tags;	/* Circular tags buffer		*/
+
+	/*
+	 *  O/S specific data structure.
+	 */
+#ifdef	SYM_HAVE_SLCB
+	struct sym_slcb s;
+#endif
+
+#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
+	/*
+	 *  Optionnaly the driver can handle device queueing, 
+	 *  and requeues internally command to redo.
+	 */
+	SYM_QUEHEAD waiting_ccbq;
+	SYM_QUEHEAD started_ccbq;
+	int	num_sgood;
+	u_short	started_tags;
+	u_short	started_no_tag;
+	u_short	started_max;
+	u_short	started_limit;
+#endif
+
+#ifdef SYM_OPT_LIMIT_COMMAND_REORDERING
+	/*
+	 *  Optionally the driver can try to prevent SCSI 
+	 *  IOs from being reordered too much.
+	 */
+	u_char		tags_si;	/* Current index to tags sum	*/
+	u_short		tags_sum[2];	/* Tags sum counters		*/
+	u_short		tags_since;	/* # of tags since last switch	*/
+#endif
+
+	/*
+	 *  Set when we want to clear all tasks.
+	 */
+	u_char to_clear;
+
+	/*
+	 *  Capabilities.
+	 */
+	u_char	user_flags;
+	u_char	curr_flags;
+};
+
+/*
+ *  Action from SCRIPTS on a task.
+ *  Is part of the CCB, but is also used separately to plug 
+ *  error handling action to perform from SCRIPTS.
+ */
+struct sym_actscr {
+	u32	start;		/* Jumped by SCRIPTS after selection	*/
+	u32	restart;	/* Jumped by SCRIPTS on relection	*/
+};
+
+/*
+ *  Phase mismatch context.
+ *
+ *  It is part of the CCB and is used as parameters for the 
+ *  DATA pointer. We need two contexts to handle correctly the 
+ *  SAVED DATA POINTER.
+ */
+struct sym_pmc {
+	struct	sym_tblmove sg;	/* Updated interrupted SG block	*/
+	u32	ret;		/* SCRIPT return address	*/
+};
+
+/*
+ *  LUN control block lookup.
+ *  We use a direct pointer for LUN #0, and a table of 
+ *  pointers which is only allocated for devices that support 
+ *  LUN(s) > 0.
+ */
+#if SYM_CONF_MAX_LUN <= 1
+#define sym_lp(tp, lun) (!lun) ? (tp)->lun0p : NULL
+#else
+#define sym_lp(tp, lun) \
+	(!lun) ? (tp)->lun0p : (tp)->lunmp ? (tp)->lunmp[(lun)] : NULL
+#endif
+
+/*
+ *  Status are used by the host and the script processor.
+ *
+ *  The last four bytes (status[4]) are copied to the 
+ *  scratchb register (declared as scr0..scr3) just after the 
+ *  select/reselect, and copied back just after disconnecting.
+ *  Inside the script the XX_REG are used.
+ */
+
+/*
+ *  Last four bytes (script)
+ */
+#define  HX_REG	scr0
+#define  HX_PRT	nc_scr0
+#define  HS_REG	scr1
+#define  HS_PRT	nc_scr1
+#define  SS_REG	scr2
+#define  SS_PRT	nc_scr2
+#define  HF_REG	scr3
+#define  HF_PRT	nc_scr3
+
+/*
+ *  Last four bytes (host)
+ */
+#define  host_xflags   phys.head.status[0]
+#define  host_status   phys.head.status[1]
+#define  ssss_status   phys.head.status[2]
+#define  host_flags    phys.head.status[3]
+
+/*
+ *  Host flags
+ */
+#define HF_IN_PM0	1u
+#define HF_IN_PM1	(1u<<1)
+#define HF_ACT_PM	(1u<<2)
+#define HF_DP_SAVED	(1u<<3)
+#define HF_SENSE	(1u<<4)
+#define HF_EXT_ERR	(1u<<5)
+#define HF_DATA_IN	(1u<<6)
+#ifdef SYM_CONF_IARB_SUPPORT
+#define HF_HINT_IARB	(1u<<7)
+#endif
+
+/*
+ *  More host flags
+ */
+#if	SYM_CONF_DMA_ADDRESSING_MODE == 2
+#define	HX_DMAP_DIRTY	(1u<<7)
+#endif
+
+/*
+ *  Global CCB HEADER.
+ *
+ *  Due to lack of indirect addressing on earlier NCR chips,
+ *  this substructure is copied from the ccb to a global 
+ *  address after selection (or reselection) and copied back 
+ *  before disconnect.
+ *  For SYMBIOS chips that support LOAD/STORE this copy is 
+ *  not needed and thus not performed.
+ */
+
+struct sym_ccbh {
+	/*
+	 *  Start and restart SCRIPTS addresses (must be at 0).
+	 */
+/*0*/	struct sym_actscr go;
+
+	/*
+	 *  SCRIPTS jump address that deal with data pointers.
+	 *  'savep' points to the position in the script responsible 
+	 *  for the actual transfer of data.
+	 *  It's written on reception of a SAVE_DATA_POINTER message.
+	 */
+	u32	savep;		/* Jump address to saved data pointer	*/
+	u32	lastp;		/* SCRIPTS address at end of data	*/
+#ifdef	SYM_OPT_HANDLE_DIR_UNKNOWN
+	u32	wlastp;
+#endif
+
+	/*
+	 *  Status fields.
+	 */
+	u8	status[4];
+};
+
+/*
+ *  GET/SET the value of the data pointer used by SCRIPTS.
+ *
+ *  We must distinguish between the LOAD/STORE-based SCRIPTS 
+ *  that use directly the header in the CCB, and the NCR-GENERIC 
+ *  SCRIPTS that use the copy of the header in the HCB.
+ */
+#if	SYM_CONF_GENERIC_SUPPORT
+#define sym_set_script_dp(np, cp, dp)				\
+	do {							\
+		if (np->features & FE_LDSTR)			\
+			cp->phys.head.lastp = cpu_to_scr(dp);	\
+		else						\
+			np->ccb_head.lastp = cpu_to_scr(dp);	\
+	} while (0)
+#define sym_get_script_dp(np, cp) 				\
+	scr_to_cpu((np->features & FE_LDSTR) ?			\
+		cp->phys.head.lastp : np->ccb_head.lastp)
+#else
+#define sym_set_script_dp(np, cp, dp)				\
+	do {							\
+		cp->phys.head.lastp = cpu_to_scr(dp);		\
+	} while (0)
+
+#define sym_get_script_dp(np, cp) (cp->phys.head.lastp)
+#endif
+
+/*
+ *  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.
+ */
+struct sym_dsb {
+	/*
+	 *  CCB header.
+	 *  Also assumed at offset 0 of the sym_ccb structure.
+	 */
+/*0*/	struct sym_ccbh head;
+
+	/*
+	 *  Phase mismatch contexts.
+	 *  We need two to handle correctly the SAVED DATA POINTER.
+	 *  MUST BOTH BE AT OFFSET < 256, due to using 8 bit arithmetic 
+	 *  for address calculation from SCRIPTS.
+	 */
+	struct sym_pmc pm0;
+	struct sym_pmc pm1;
+
+	/*
+	 *  Table data for Script
+	 */
+	struct sym_tblsel  select;
+	struct sym_tblmove smsg;
+	struct sym_tblmove smsg_ext;
+	struct sym_tblmove cmd;
+	struct sym_tblmove sense;
+	struct sym_tblmove wresid;
+	struct sym_tblmove data [SYM_CONF_MAX_SG];
+};
+
+/*
+ *  Our Command Control Block
+ */
+struct sym_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.
+	 */
+	struct sym_dsb phys;
+
+	/*
+	 *  Pointer to CAM ccb and related stuff.
+	 */
+	struct scsi_cmnd *cmd;	/* CAM scsiio ccb		*/
+	u8	cdb_buf[16];	/* Copy of CDB			*/
+#define	SYM_SNS_BBUF_LEN 32
+	u8	sns_bbuf[SYM_SNS_BBUF_LEN]; /* Bounce buffer for sense data */
+	int	data_len;	/* Total data length		*/
+	int	segments;	/* Number of SG segments	*/
+
+	u8	order;		/* Tag type (if tagged command)	*/
+
+	/*
+	 *  Miscellaneous status'.
+	 */
+	u_char	nego_status;	/* Negotiation status		*/
+	u_char	xerr_status;	/* Extended error flags		*/
+	u32	extra_bytes;	/* Extraneous bytes transferred	*/
+
+	/*
+	 *  Message areas.
+	 *  We prepare a message to be sent after selection.
+	 *  We may use a second one if the command is rescheduled 
+	 *  due to CHECK_CONDITION or COMMAND TERMINATED.
+	 *  Contents are IDENTIFY and SIMPLE_TAG.
+	 *  While negotiating sync or wide transfer,
+	 *  a SDTR or WDTR message is appended.
+	 */
+	u_char	scsi_smsg [12];
+	u_char	scsi_smsg2[12];
+
+	/*
+	 *  Auto request sense related fields.
+	 */
+	u_char	sensecmd[6];	/* Request Sense command	*/
+	u_char	sv_scsi_status;	/* Saved SCSI status 		*/
+	u_char	sv_xerr_status;	/* Saved extended status	*/
+	int	sv_resid;	/* Saved residual		*/
+
+	/*
+	 *  Other fields.
+	 */
+	u32	ccb_ba;		/* BUS address of this CCB	*/
+	u_short	tag;		/* Tag for this transfer	*/
+				/*  NO_TAG means no tag		*/
+	u_char	target;
+	u_char	lun;
+	struct sym_ccb *link_ccbh;	/* Host adapter CCB hash chain	*/
+	SYM_QUEHEAD link_ccbq;	/* Link to free/busy CCB queue	*/
+	u32	startp;		/* Initial data pointer		*/
+	u32	goalp;		/* Expected last data pointer	*/
+#ifdef	SYM_OPT_HANDLE_DIR_UNKNOWN
+	u32	wgoalp;
+#endif
+	int	ext_sg;		/* Extreme data pointer, used	*/
+	int	ext_ofs;	/*  to calculate the residual.	*/
+#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
+	SYM_QUEHEAD link2_ccbq;	/* Link for device queueing	*/
+	u_char	started;	/* CCB queued to the squeue	*/
+#endif
+	u_char	to_abort;	/* Want this IO to be aborted	*/
+#ifdef SYM_OPT_LIMIT_COMMAND_REORDERING
+	u_char	tags_si;	/* Lun tags sum index (0,1)	*/
+#endif
+};
+
+#define CCB_BA(cp,lbl)	(cp->ccb_ba + offsetof(struct sym_ccb, lbl))
+
+#ifdef	SYM_OPT_HANDLE_DIR_UNKNOWN
+#define	sym_goalp(cp) ((cp->host_flags & HF_DATA_IN) ? cp->goalp : cp->wgoalp)
+#else
+#define	sym_goalp(cp) (cp->goalp)
+#endif
+
+typedef struct device *m_pool_ident_t;
+
+/*
+ *  Host Control Block
+ */
+struct sym_hcb {
+	/*
+	 *  Global headers.
+	 *  Due to poorness of addressing capabilities, earlier 
+	 *  chips (810, 815, 825) copy part of the data structures 
+	 *  (CCB, TCB and LCB) in fixed areas.
+	 */
+#if	SYM_CONF_GENERIC_SUPPORT
+	struct sym_ccbh	ccb_head;
+	struct sym_tcbh	tcb_head;
+	struct sym_lcbh	lcb_head;
+#endif
+	/*
+	 *  Idle task and invalid task actions and 
+	 *  their bus addresses.
+	 */
+	struct sym_actscr idletask, notask, bad_itl, bad_itlq;
+	u32 idletask_ba, notask_ba, bad_itl_ba, bad_itlq_ba;
+
+	/*
+	 *  Dummy lun table to protect us against target 
+	 *  returning bad lun number on reselection.
+	 */
+	u32	*badluntbl;	/* Table physical address	*/
+	u32	badlun_sa;	/* SCRIPT handler BUS address	*/
+
+	/*
+	 *  Bus address of this host control block.
+	 */
+	u32	hcb_ba;
+
+	/*
+	 *  Bit 32-63 of the on-chip RAM bus address in LE format.
+	 *  The START_RAM64 script loads the MMRS and MMWS from this 
+	 *  field.
+	 */
+	u32	scr_ram_seg;
+
+	/*
+	 *  Initial value of some IO register bits.
+	 *  These values are assumed to have been set by BIOS, and may 
+	 *  be used to probe adapter implementation differences.
+	 */
+	u_char	sv_scntl0, sv_scntl3, sv_dmode, sv_dcntl, sv_ctest3, sv_ctest4,
+		sv_ctest5, sv_gpcntl, sv_stest2, sv_stest4, sv_scntl4,
+		sv_stest1;
+
+	/*
+	 *  Actual initial value of IO register bits used by the 
+	 *  driver. They are loaded at initialisation according to  
+	 *  features that are to be enabled/disabled.
+	 */
+	u_char	rv_scntl0, rv_scntl3, rv_dmode, rv_dcntl, rv_ctest3, rv_ctest4, 
+		rv_ctest5, rv_stest2, rv_ccntl0, rv_ccntl1, rv_scntl4;
+
+	/*
+	 *  Target data.
+	 */
+	struct sym_tcb	target[SYM_CONF_MAX_TARGET];
+
+	/*
+	 *  Target control block bus address array used by the SCRIPT 
+	 *  on reselection.
+	 */
+	u32		*targtbl;
+	u32		targtbl_ba;
+
+	/*
+	 *  DMA pool handle for this HBA.
+	 */
+	m_pool_ident_t	bus_dmat;
+
+	/*
+	 *  O/S specific data structure
+	 */
+	struct sym_shcb s;
+
+	/*
+	 *  Physical bus addresses of the chip.
+	 */
+	u32		mmio_ba;	/* MMIO 32 bit BUS address	*/
+	int		mmio_ws;	/* MMIO Window size		*/
+
+	u32		ram_ba;		/* RAM 32 bit BUS address	*/
+	int		ram_ws;		/* RAM window size		*/
+
+	/*
+	 *  SCRIPTS virtual and physical bus addresses.
+	 *  'script'  is loaded in the on-chip RAM if present.
+	 *  'scripth' stays in main memory for all chips except the 
+	 *  53C895A, 53C896 and 53C1010 that provide 8K on-chip RAM.
+	 */
+	u_char		*scripta0;	/* Copy of scripts A, B, Z	*/
+	u_char		*scriptb0;
+	u_char		*scriptz0;
+	u32		scripta_ba;	/* Actual scripts A, B, Z	*/
+	u32		scriptb_ba;	/* 32 bit bus addresses.	*/
+	u32		scriptz_ba;
+	u_short		scripta_sz;	/* Actual size of script A, B, Z*/
+	u_short		scriptb_sz;
+	u_short		scriptz_sz;
+
+	/*
+	 *  Bus addresses, setup and patch methods for 
+	 *  the selected firmware.
+	 */
+	struct sym_fwa_ba fwa_bas;	/* Useful SCRIPTA bus addresses	*/
+	struct sym_fwb_ba fwb_bas;	/* Useful SCRIPTB bus addresses	*/
+	struct sym_fwz_ba fwz_bas;	/* Useful SCRIPTZ bus addresses	*/
+	void		(*fw_setup)(struct sym_hcb *np, struct sym_fw *fw);
+	void		(*fw_patch)(struct sym_hcb *np);
+	char		*fw_name;
+
+	/*
+	 *  General controller parameters and configuration.
+	 */
+	u_short	device_id;	/* PCI device id		*/
+	u_char	revision_id;	/* PCI device revision id	*/
+	u_int	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;	/* Min sync period factor (ST)	*/
+	u_char	maxsync;	/* Max sync period factor (ST)	*/
+	u_char	maxoffs;	/* Max scsi offset        (ST)	*/
+	u_char	minsync_dt;	/* Min sync period factor (DT)	*/
+	u_char	maxsync_dt;	/* Max sync period factor (DT)	*/
+	u_char	maxoffs_dt;	/* Max scsi offset        (DT)	*/
+	u_char	multiplier;	/* Clock multiplier (1,2,4)	*/
+	u_char	clock_divn;	/* Number of clock divisors	*/
+	u32	clock_khz;	/* SCSI clock frequency in KHz	*/
+	u32	pciclk_khz;	/* Estimated PCI clock  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.
+	 */
+	volatile		/* Prevent code optimizations	*/
+	u32	*squeue;	/* Start queue virtual address	*/
+	u32	squeue_ba;	/* Start queue BUS address	*/
+	u_short	squeueput;	/* Next free slot of the queue	*/
+	u_short	actccbs;	/* Number of allocated CCBs	*/
+
+	/*
+	 *  Command completion queue.
+	 *  It is the same size as the start queue to avoid overflow.
+	 */
+	u_short	dqueueget;	/* Next position to scan	*/
+	volatile		/* Prevent code optimizations	*/
+	u32	*dqueue;	/* Completion (done) queue	*/
+	u32	dqueue_ba;	/* Done queue BUS address	*/
+
+	/*
+	 *  Miscellaneous buffers accessed by the scripts-processor.
+	 *  They shall be DWORD aligned, because they may be read or 
+	 *  written with a script command.
+	 */
+	u_char		msgout[8];	/* Buffer for MESSAGE OUT 	*/
+	u_char		msgin [8];	/* Buffer for MESSAGE IN	*/
+	u32		lastmsg;	/* Last SCSI message sent	*/
+	u32		scratch;	/* Scratch for SCSI receive	*/
+					/* Also used for cache test 	*/
+	/*
+	 *  Miscellaneous configuration and status parameters.
+	 */
+	u_char		usrflags;	/* Miscellaneous user flags	*/
+	u_char		scsi_mode;	/* Current SCSI BUS mode	*/
+	u_char		verbose;	/* Verbosity for this controller*/
+
+	/*
+	 *  CCB lists and queue.
+	 */
+	struct sym_ccb **ccbh;			/* CCBs hashed by DSA value	*/
+					/* CCB_HASH_SIZE lists of CCBs	*/
+	SYM_QUEHEAD	free_ccbq;	/* Queue of available CCBs	*/
+	SYM_QUEHEAD	busy_ccbq;	/* Queue of busy CCBs		*/
+
+	/*
+	 *  During error handling and/or recovery,
+	 *  active CCBs that are to be completed with 
+	 *  error or requeued are moved from the busy_ccbq
+	 *  to the comp_ccbq prior to completion.
+	 */
+	SYM_QUEHEAD	comp_ccbq;
+
+#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
+	SYM_QUEHEAD	dummy_ccbq;
+#endif
+
+	/*
+	 *  IMMEDIATE ARBITRATION (IARB) control.
+	 *
+	 *  We keep track in 'last_cp' of the last CCB that has been 
+	 *  queued to the SCRIPTS processor and clear 'last_cp' when 
+	 *  this CCB completes. If last_cp is not zero at the moment 
+	 *  we queue a new CCB, we set a flag in 'last_cp' that is 
+	 *  used by the SCRIPTS as a hint for setting IARB.
+	 *  We donnot set more than 'iarb_max' consecutive hints for 
+	 *  IARB in order to leave devices a chance to reselect.
+	 *  By the way, any non zero value of 'iarb_max' is unfair. :)
+	 */
+#ifdef SYM_CONF_IARB_SUPPORT
+	u_short		iarb_max;	/* Max. # consecutive IARB hints*/
+	u_short		iarb_count;	/* Actual # of these hints	*/
+	struct sym_ccb *	last_cp;
+#endif
+
+	/*
+	 *  Command abort handling.
+	 *  We need to synchronize tightly with the SCRIPTS 
+	 *  processor in order to handle things correctly.
+	 */
+	u_char		abrt_msg[4];	/* Message to send buffer	*/
+	struct sym_tblmove abrt_tbl;	/* Table for the MOV of it 	*/
+	struct sym_tblsel  abrt_sel;	/* Sync params for selection	*/
+	u_char		istat_sem;	/* Tells the chip to stop (SEM)	*/
+
+	/*
+	 *  64 bit DMA handling.
+	 */
+#if	SYM_CONF_DMA_ADDRESSING_MODE != 0
+	u_char	use_dac;		/* Use PCI DAC cycles		*/
+#if	SYM_CONF_DMA_ADDRESSING_MODE == 2
+	u_char	dmap_dirty;		/* Dma segments registers dirty	*/
+	u32	dmap_bah[SYM_DMAP_SIZE];/* Segment registers map	*/
+#endif
+#endif
+};
+
+#define HCB_BA(np, lbl)	(np->hcb_ba + offsetof(struct sym_hcb, lbl))
+
+
+/*
+ *  FIRMWARES (sym_fw.c)
+ */
+struct sym_fw * sym_find_firmware(struct sym_chip *chip);
+void sym_fw_bind_script(struct sym_hcb *np, u32 *start, int len);
+
+/*
+ *  Driver methods called from O/S specific code.
+ */
+char *sym_driver_name(void);
+void sym_print_xerr(struct scsi_cmnd *cmd, int x_status);
+int sym_reset_scsi_bus(struct sym_hcb *np, int enab_int);
+struct sym_chip *sym_lookup_chip_table(u_short device_id, u_char revision);
+void sym_put_start_queue(struct sym_hcb *np, struct sym_ccb *cp);
+#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
+void sym_start_next_ccbs(struct sym_hcb *np, struct sym_lcb *lp, int maxn);
+#endif
+void sym_start_up(struct sym_hcb *np, int reason);
+void sym_interrupt(struct sym_hcb *np);
+int sym_clear_tasks(struct sym_hcb *np, int cam_status, int target, int lun, int task);
+struct sym_ccb *sym_get_ccb(struct sym_hcb *np, struct scsi_cmnd *cmd, u_char tag_order);
+void sym_free_ccb(struct sym_hcb *np, struct sym_ccb *cp);
+struct sym_lcb *sym_alloc_lcb(struct sym_hcb *np, u_char tn, u_char ln);
+int sym_queue_scsiio(struct sym_hcb *np, struct scsi_cmnd *csio, struct sym_ccb *cp);
+int sym_abort_scsiio(struct sym_hcb *np, struct scsi_cmnd *ccb, int timed_out);
+int sym_reset_scsi_target(struct sym_hcb *np, int target);
+void sym_hcb_free(struct sym_hcb *np);
+int sym_hcb_attach(struct Scsi_Host *shost, struct sym_fw *fw, struct sym_nvram *nvram);
+
+/*
+ *  Build a scatter/gather entry.
+ *
+ *  For 64 bit systems, we use the 8 upper bits of the size field 
+ *  to provide bus address bits 32-39 to the SCRIPTS processor.
+ *  This allows the 895A, 896, 1010 to address up to 1 TB of memory.
+ */
+
+#if   SYM_CONF_DMA_ADDRESSING_MODE == 0
+#define sym_build_sge(np, data, badd, len)	\
+do {						\
+	(data)->addr = cpu_to_scr(badd);	\
+	(data)->size = cpu_to_scr(len);		\
+} while (0)
+#elif SYM_CONF_DMA_ADDRESSING_MODE == 1
+#define sym_build_sge(np, data, badd, len)				\
+do {									\
+	(data)->addr = cpu_to_scr(badd);				\
+	(data)->size = cpu_to_scr((((badd) >> 8) & 0xff000000) + len);	\
+} while (0)
+#elif SYM_CONF_DMA_ADDRESSING_MODE == 2
+int sym_lookup_dmap(struct sym_hcb *np, u32 h, int s);
+static __inline void 
+sym_build_sge(struct sym_hcb *np, struct sym_tblmove *data, u64 badd, int len)
+{
+	u32 h = (badd>>32);
+	int s = (h&SYM_DMAP_MASK);
+
+	if (h != np->dmap_bah[s])
+		goto bad;
+good:
+	(data)->addr = cpu_to_scr(badd);
+	(data)->size = cpu_to_scr((s<<24) + len);
+	return;
+bad:
+	s = sym_lookup_dmap(np, h, s);
+	goto good;
+}
+#else
+#error "Unsupported DMA addressing mode"
+#endif
+
+/*
+ *  Set up data pointers used by SCRIPTS.
+ *  Called from O/S specific code.
+ */
+static inline void sym_setup_data_pointers(struct sym_hcb *np,
+		struct sym_ccb *cp, int dir)
+{
+	u32 lastp, goalp;
+
+	/*
+	 *  No segments means no data.
+	 */
+	if (!cp->segments)
+		dir = CAM_DIR_NONE;
+
+	/*
+	 *  Set the data pointer.
+	 */
+	switch(dir) {
+#ifdef	SYM_OPT_HANDLE_DIR_UNKNOWN
+	case CAM_DIR_UNKNOWN:
+#endif
+	case CAM_DIR_OUT:
+		goalp = SCRIPTA_BA(np, data_out2) + 8;
+		lastp = goalp - 8 - (cp->segments * (2*4));
+#ifdef	SYM_OPT_HANDLE_DIR_UNKNOWN
+		cp->wgoalp = cpu_to_scr(goalp);
+		if (dir != CAM_DIR_UNKNOWN)
+			break;
+		cp->phys.head.wlastp = cpu_to_scr(lastp);
+		/* fall through */
+#else
+		break;
+#endif
+	case CAM_DIR_IN:
+		cp->host_flags |= HF_DATA_IN;
+		goalp = SCRIPTA_BA(np, data_in2) + 8;
+		lastp = goalp - 8 - (cp->segments * (2*4));
+		break;
+	case CAM_DIR_NONE:
+	default:
+#ifdef	SYM_OPT_HANDLE_DIR_UNKNOWN
+		cp->host_flags |= HF_DATA_IN;
+#endif
+		lastp = goalp = SCRIPTB_BA(np, no_data);
+		break;
+	}
+
+	/*
+	 *  Set all pointers values needed by SCRIPTS.
+	 */
+	cp->phys.head.lastp = cpu_to_scr(lastp);
+	cp->phys.head.savep = cpu_to_scr(lastp);
+	cp->startp	    = cp->phys.head.savep;
+	cp->goalp	    = cpu_to_scr(goalp);
+
+#ifdef	SYM_OPT_HANDLE_DIR_UNKNOWN
+	/*
+	 *  If direction is unknown, start at data_io.
+	 */
+	if (dir == CAM_DIR_UNKNOWN)
+		cp->phys.head.savep = cpu_to_scr(SCRIPTB_BA(np, data_io));
+#endif
+}
+
+/*
+ *  MEMORY ALLOCATOR.
+ */
+
+#define SYM_MEM_PAGE_ORDER 0	/* 1 PAGE  maximum */
+#define SYM_MEM_CLUSTER_SHIFT	(PAGE_SHIFT+SYM_MEM_PAGE_ORDER)
+#define SYM_MEM_FREE_UNUSED	/* Free unused pages immediately */
+
+#define SYM_MEM_WARN	1	/* Warn on failed operations */
+
+#define sym_get_mem_cluster()	\
+	(void *) __get_free_pages(GFP_ATOMIC, SYM_MEM_PAGE_ORDER)
+#define sym_free_mem_cluster(p)	\
+	free_pages((unsigned long)p, SYM_MEM_PAGE_ORDER)
+
+/*
+ *  Link between free memory chunks of a given size.
+ */
+typedef struct sym_m_link {
+	struct sym_m_link *next;
+} *m_link_p;
+
+/*
+ *  Virtual to bus physical translation for a given cluster.
+ *  Such a structure is only useful with DMA abstraction.
+ */
+typedef struct sym_m_vtob {	/* Virtual to Bus address translation */
+	struct sym_m_vtob *next;
+	void *vaddr;		/* Virtual address */
+	dma_addr_t baddr;	/* Bus physical address */
+} *m_vtob_p;
+
+/* Hash this stuff a bit to speed up translations */
+#define VTOB_HASH_SHIFT		5
+#define VTOB_HASH_SIZE		(1UL << VTOB_HASH_SHIFT)
+#define VTOB_HASH_MASK		(VTOB_HASH_SIZE-1)
+#define VTOB_HASH_CODE(m)	\
+	((((unsigned long)(m)) >> SYM_MEM_CLUSTER_SHIFT) & VTOB_HASH_MASK)
+
+/*
+ *  Memory pool of a given kind.
+ *  Ideally, we want to use:
+ *  1) 1 pool for memory we donnot need to involve in DMA.
+ *  2) The same pool for controllers that require same DMA 
+ *     constraints and features.
+ *     The OS specific m_pool_id_t thing and the sym_m_pool_match() 
+ *     method are expected to tell the driver about.
+ */
+typedef struct sym_m_pool {
+	m_pool_ident_t	dev_dmat;	/* Identifies the pool (see above) */
+	void * (*get_mem_cluster)(struct sym_m_pool *);
+#ifdef	SYM_MEM_FREE_UNUSED
+	void (*free_mem_cluster)(struct sym_m_pool *, void *);
+#endif
+#define M_GET_MEM_CLUSTER()		mp->get_mem_cluster(mp)
+#define M_FREE_MEM_CLUSTER(p)		mp->free_mem_cluster(mp, p)
+	int nump;
+	m_vtob_p vtob[VTOB_HASH_SIZE];
+	struct sym_m_pool *next;
+	struct sym_m_link h[SYM_MEM_CLUSTER_SHIFT - SYM_MEM_SHIFT + 1];
+} *m_pool_p;
+
+/*
+ *  Alloc, free and translate addresses to bus physical 
+ *  for DMAable memory.
+ */
+void *__sym_calloc_dma(m_pool_ident_t dev_dmat, int size, char *name);
+void __sym_mfree_dma(m_pool_ident_t dev_dmat, void *m, int size, char *name);
+dma_addr_t __vtobus(m_pool_ident_t dev_dmat, void *m);
+
+/*
+ * Verbs used by the driver code for DMAable memory handling.
+ * The _uvptv_ macro avoids a nasty warning about pointer to volatile 
+ * being discarded.
+ */
+#define _uvptv_(p) ((void *)((u_long)(p)))
+
+#define _sym_calloc_dma(np, l, n)	__sym_calloc_dma(np->bus_dmat, l, n)
+#define _sym_mfree_dma(np, p, l, n)	\
+			__sym_mfree_dma(np->bus_dmat, _uvptv_(p), l, n)
+#define sym_calloc_dma(l, n)		_sym_calloc_dma(np, l, n)
+#define sym_mfree_dma(p, l, n)		_sym_mfree_dma(np, p, l, n)
+#define vtobus(p)			__vtobus(np->bus_dmat, _uvptv_(p))
+
+/*
+ *  We have to provide the driver memory allocator with methods for 
+ *  it to maintain virtual to bus physical address translations.
+ */
+
+#define sym_m_pool_match(mp_id1, mp_id2)	(mp_id1 == mp_id2)
+
+static __inline void *sym_m_get_dma_mem_cluster(m_pool_p mp, m_vtob_p vbp)
+{
+	void *vaddr = NULL;
+	dma_addr_t baddr = 0;
+
+	vaddr = dma_alloc_coherent(mp->dev_dmat, SYM_MEM_CLUSTER_SIZE, &baddr,
+			GFP_ATOMIC);
+	if (vaddr) {
+		vbp->vaddr = vaddr;
+		vbp->baddr = baddr;
+	}
+	return vaddr;
+}
+
+static __inline void sym_m_free_dma_mem_cluster(m_pool_p mp, m_vtob_p vbp)
+{
+	dma_free_coherent(mp->dev_dmat, SYM_MEM_CLUSTER_SIZE, vbp->vaddr,
+			vbp->baddr);
+}
+
+#endif /* SYM_HIPD_H */