53c700.h

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/* -*- mode: c; c-basic-offset: 8 -*- */

/* Driver for 53c700 and 53c700-66 chips from NCR and Symbios
 *
 * Copyright (C) 2001 by [e-mail]
 */

#ifndef _53C700_H
#define _53C700_H

/* Turn on for general debugging---too verbose for normal use */
#undef NCR_700_DEBUG
/* Debug the tag queues, checking hash queue allocation and deallocation
 * and search for duplicate tags */
#undef NCR_700_TAG_DEBUG

#ifdef NCR_700_DEBUG
#define DEBUG(x)	printk x
#else
#define DEBUG(x)
#endif

/* The number of available command slots */
#define NCR_700_COMMAND_SLOTS_PER_HOST	64
/* The maximum number of Scatter Gathers we allow */
#define NCR_700_SG_SEGMENTS		32
/* The maximum number of luns (make this of the form 2^n) */
#define NCR_700_MAX_LUNS		32
#define NCR_700_LUN_MASK		(NCR_700_MAX_LUNS - 1)
/* Alter this with care: too many tags won't give the elevator a chance to
 * work; too few will cause the device to operate less efficiently */
#define NCR_700_MAX_TAGS		16
/* magic byte identifying an internally generated REQUEST_SENSE command */
#define NCR_700_INTERNAL_SENSE_MAGIC	0x42

/* WARNING: Leave this in for now: the dependency preprocessor doesn't
 * pick up file specific flags, so must define here if they are not
 * set */
#if !defined(CONFIG_53C700_IO_MAPPED) && !defined(CONFIG_53C700_MEM_MAPPED)
#error "Config.in must define either CONFIG_53C700_IO_MAPPED or CONFIG_53C700_MEM_MAPPED to use this scsi core."
#endif

/* macros for consistent memory allocation */

#ifdef CONFIG_53C700_USE_CONSISTENT
#define NCR_700_dma_cache_wback(mem, size) \
	if(!hostdata->consistent) \
		dma_cache_wback(mem, size)
#define NCR_700_dma_cache_inv(mem, size) \
	if(!hostdata->consistent) \
		dma_cache_inv(mem, size)
#define NCR_700_dma_cache_wback_inv(mem, size) \
	if(!hostdata->consistent) \
		dma_cache_wback_inv(mem, size)
#else
#define NCR_700_dma_cache_wback(mem, size) dma_cache_wback(mem,size)
#define NCR_700_dma_cache_inv(mem, size) dma_cache_inv(mem,size)
#define NCR_700_dma_cache_wback_inv(mem, size) dma_cache_wback_inv(mem,size)
#endif


struct NCR_700_Host_Parameters;

/* These are the externally used routines */
struct Scsi_Host *NCR_700_detect(Scsi_Host_Template *, struct NCR_700_Host_Parameters *);
int NCR_700_release(struct Scsi_Host *host);
void NCR_700_intr(int, void *, struct pt_regs *);


enum NCR_700_Host_State {
	NCR_700_HOST_BUSY,
	NCR_700_HOST_FREE,
};

struct NCR_700_SG_List {
	/* The following is a script fragment to move the buffer onto the
	 * bus and then link the next fragment or return */
	#define	SCRIPT_MOVE_DATA_IN		0x09000000
	#define	SCRIPT_MOVE_DATA_OUT		0x08000000
	__u32	ins;
	__u32	pAddr;
	#define	SCRIPT_NOP			0x80000000
	#define	SCRIPT_RETURN			0x90080000
};

/* We use device->hostdata to store negotiated parameters.  This is
 * supposed to be a pointer to a device private area, but we cannot
 * really use it as such since it will never be freed, so just use the
 * 32 bits to cram the information.  The SYNC negotiation sequence looks
 * like:
 * 
 * If DEV_NEGOTIATED_SYNC not set, tack and SDTR message on to the
 * initial identify for the device and set DEV_BEGIN_SYNC_NEGOTATION
 * If we get an SDTR reply, work out the SXFER parameters, squirrel
 * them away here, clear DEV_BEGIN_SYNC_NEGOTIATION and set
 * DEV_NEGOTIATED_SYNC.  If we get a REJECT msg, squirrel
 *
 *
 * 0:7	SXFER_REG negotiated value for this device
 * 8:15 Current queue depth
 * 16	negotiated SYNC flag
 * 17 begin SYNC negotiation flag 
 * 18 device supports tag queueing */
#define NCR_700_DEV_NEGOTIATED_SYNC	(1<<16)
#define NCR_700_DEV_BEGIN_SYNC_NEGOTIATION	(1<<17)
#define NCR_700_DEV_BEGIN_TAG_QUEUEING	(1<<18)
#define NCR_700_DEV_TAG_STARVATION_WARNED (1<<19)

static inline void
NCR_700_set_SXFER(Scsi_Device *SDp, __u8 sxfer)
{
	((unsigned long)SDp->hostdata) &= 0xffffff00;
	((unsigned long)SDp->hostdata) |= sxfer & 0xff;
}
static inline __u8 NCR_700_get_SXFER(Scsi_Device *SDp)
{
	return (((unsigned long)SDp->hostdata) & 0xff);
}
static inline void
NCR_700_set_depth(Scsi_Device *SDp, __u8 depth)
{
	((unsigned long)SDp->hostdata) &= 0xffff00ff;
	((unsigned long)SDp->hostdata) |= (0xff00 & (depth << 8));
}
static inline __u8
NCR_700_get_depth(Scsi_Device *SDp)
{
	return ((((unsigned long)SDp->hostdata) & 0xff00)>>8);
}
static inline int
NCR_700_is_flag_set(Scsi_Device *SDp, __u32 flag)
{
	return (((unsigned long)SDp->hostdata) & flag) == flag;
}
static inline int
NCR_700_is_flag_clear(Scsi_Device *SDp, __u32 flag)
{
	return (((unsigned long)SDp->hostdata) & flag) == 0;
}
static inline void
NCR_700_set_flag(Scsi_Device *SDp, __u32 flag)
{
	((unsigned long)SDp->hostdata) |= (flag & 0xffff0000);
}
static inline void
NCR_700_clear_flag(Scsi_Device *SDp, __u32 flag)
{
	((unsigned long)SDp->hostdata) &= ~(flag & 0xffff0000);
}

/* These represent the Nexus hashing functions.  A Nexus in SCSI terms
 * just means the identification of an outstanding command, by ITL
 * (Initiator Target Lun) or ITLQ (Initiator Target Lun Tag).  I'm not
 * very keen on XOR based hashes, so these are based on number theory
 * instead.  All you need to do is to fix your hash bucket size and
 * then choose reasonable strides which are coprime with the chosen
 * bucket size
 *
 * Note: this mathematical hash can be made very efficient, if the
 * compiler is good at optimising: Choose the number of buckets to be
 * 2^n and the modulo becomes a logical and with (2^n-1).
 * Additionally, if you chose the coprimes of the form 2^n-2^n the
 * multiplication can be done by a shift and an addition. */
#define MAX_ITL_HASH_BUCKETS	16
#define ITL_HASH_PRIME		7

#define MAX_ITLQ_HASH_BUCKETS	64
#define ITLQ_PUN_PRIME		7
#define ITLQ_LUN_PRIME		3

static inline int
hash_ITL(__u8 pun, __u8 lun)
{
	return (pun*ITL_HASH_PRIME + lun) % MAX_ITL_HASH_BUCKETS;
}

static inline int
hash_ITLQ(__u8 pun, __u8 lun, __u8 tag)
{
	return (pun*ITLQ_PUN_PRIME + lun*ITLQ_LUN_PRIME + tag) % MAX_ITLQ_HASH_BUCKETS;
}

struct NCR_700_command_slot {
	struct NCR_700_SG_List	SG[NCR_700_SG_SEGMENTS+1];
	struct NCR_700_SG_List	*pSG;
	#define NCR_700_SLOT_MASK 0xFC
	#define NCR_700_SLOT_MAGIC 0xb8
	#define	NCR_700_SLOT_FREE (0|NCR_700_SLOT_MAGIC) /* slot may be used */
	#define NCR_700_SLOT_BUSY (1|NCR_700_SLOT_MAGIC) /* slot has command active on HA */
	#define NCR_700_SLOT_QUEUED (2|NCR_700_SLOT_MAGIC) /* slot has command to be made active on HA */
	__u8	state;
	#define NCR_700_NO_TAG	0xdead
	__u16	tag;
	__u32	resume_offset;
	Scsi_Cmnd	*cmnd;
	/* The pci_mapped address of the actual command in cmnd */
	dma_addr_t	pCmd;
	__u32		temp;
	/* if this command is a pci_single mapping, holds the dma address
	 * for later unmapping in the done routine */
	dma_addr_t	dma_handle;
	/* Doubly linked ITL/ITLQ list kept in strict time order
	 * (latest at the back) */
	struct NCR_700_command_slot *ITL_forw;
	struct NCR_700_command_slot *ITL_back;
	struct NCR_700_command_slot *ITLQ_forw;
	struct NCR_700_command_slot *ITLQ_back;
};

struct NCR_700_Host_Parameters {
	/* These must be filled in by the calling driver */
	int	clock;			/* board clock speed in MHz */
	unsigned long	base;		/* the base for the port (copied to host) */
	struct pci_dev	*pci_dev;
	__u32	dmode_extra;	/* adjustable bus settings */
	__u32	differential:1;	/* if we are differential */
#ifdef CONFIG_53C700_LE_ON_BE
	/* This option is for HP only.  Set it if your chip is wired for
	 * little endian on this platform (which is big endian) */
	__u32	force_le_on_be:1;
#endif
	__u32	chip710:1;	/* set if really a 710 not 700 */
	__u32	burst_disable:1;	/* set to 1 to disable 710 bursting */

	/* NOTHING BELOW HERE NEEDS ALTERING */
	__u32	fast:1;		/* if we can alter the SCSI bus clock
                                   speed (so can negiotiate sync) */
#ifdef CONFIG_53C700_USE_CONSISTENT
	__u32	consistent:1;
#endif

	int	sync_clock;	/* The speed of the SYNC core */

	__u32	*script;		/* pointer to script location */
	__u32	pScript;		/* physical mem addr of script */

	/* This will be the host lock.  Unfortunately, we can't use it
	 * at the moment because of the necessity of holding the
	 * io_request_lock */
	spinlock_t lock;
	enum NCR_700_Host_State state; /* protected by state lock */
	Scsi_Cmnd *cmd;
	/* Note: pScript contains the single consistent block of
	 * memory.  All the msgin, msgout and status are allocated in
	 * this memory too (at separate cache lines).  TOTAL_MEM_SIZE
	 * represents the total size of this area */
#define	MSG_ARRAY_SIZE	8
#define	MSGOUT_OFFSET	(L1_CACHE_ALIGN(sizeof(SCRIPT)))
	__u8	*msgout;
#define MSGIN_OFFSET	(MSGOUT_OFFSET + L1_CACHE_ALIGN(MSG_ARRAY_SIZE))
	__u8	*msgin;
#define STATUS_OFFSET	(MSGIN_OFFSET + L1_CACHE_ALIGN(MSG_ARRAY_SIZE))
	__u8	*status;
#define SLOTS_OFFSET	(STATUS_OFFSET + L1_CACHE_ALIGN(MSG_ARRAY_SIZE))
	struct NCR_700_command_slot	*slots;
#define	TOTAL_MEM_SIZE	(SLOTS_OFFSET + L1_CACHE_ALIGN(sizeof(struct NCR_700_command_slot) * NCR_700_COMMAND_SLOTS_PER_HOST))
	int	saved_slot_position;
	int	command_slot_count; /* protected by state lock */
	__u8	tag_negotiated;
	__u8	rev;
	__u8	reselection_id;
	/* flags for the host */

	/* ITL list.  ALL outstanding commands are hashed here in strict
	 * order, latest at the back */
	struct NCR_700_command_slot *ITL_Hash_forw[MAX_ITL_HASH_BUCKETS];
	struct NCR_700_command_slot *ITL_Hash_back[MAX_ITL_HASH_BUCKETS];

	/* Only tagged outstanding commands are hashed here (also latest
	 * at the back) */
	struct NCR_700_command_slot *ITLQ_Hash_forw[MAX_ITLQ_HASH_BUCKETS];
	struct NCR_700_command_slot *ITLQ_Hash_back[MAX_ITLQ_HASH_BUCKETS];

	/* Free list, singly linked by ITL_forw elements */
	struct NCR_700_command_slot *free_list;
};

/*
 *	53C700 Register Interface - the offset from the Selected base
 *	I/O address */
#ifdef CONFIG_53C700_LE_ON_BE
#define bE	(hostdata->force_le_on_be ? 0 : 3)
#define	bSWAP	(hostdata->force_le_on_be)
#elif defined(__BIG_ENDIAN)
#define bE	3
#define bSWAP	0
#elif defined(__LITTLE_ENDIAN)
#define bE	0
#define bSWAP	0
#else
#error "__BIG_ENDIAN or __LITTLE_ENDIAN must be defined, did you include byteorder.h?"
#endif
#define bS_to_cpu(x)	(bSWAP ? le32_to_cpu(x) : (x))
#define bS_to_host(x)	(bSWAP ? cpu_to_le32(x) : (x))

/* NOTE: These registers are in the LE register space only, the required byte