drivers/scsi/hpsa.h - kernel/common - Git at Google

 /*
  *    Disk Array driver for HP Smart Array SAS controllers
  *    Copyright 2016 Microsemi Corporation
  *    Copyright 2014-2015 PMC-Sierra, Inc.
  *    Copyright 2000,2009-2015 Hewlett-Packard Development Company, L.P.
  *
  *    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; version 2 of the License.
  *
  *    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, GOOD TITLE or
  *    NON INFRINGEMENT.  See the GNU General Public License for more details.
  *
  *    Questions/Comments/Bugfixes to [email protected]
  *
  */
 #ifndef HPSA_H
 #define HPSA_H

 #include <scsi/scsicam.h>

 #define IO_OK		0
 #define IO_ERROR	1

 struct ctlr_info;

 struct access_method {
 	void (*submit_command)(struct ctlr_info *h,
 		struct CommandList *c);
 	void (*set_intr_mask)(struct ctlr_info *h, unsigned long val);
 	bool (*intr_pending)(struct ctlr_info *h);
 	unsigned long (*command_completed)(struct ctlr_info *h, u8 q);
 };

 /* for SAS hosts and SAS expanders */
 struct hpsa_sas_node {
 	struct device *parent_dev;
 	struct list_head port_list_head;
 };

 struct hpsa_sas_port {
 	struct list_head port_list_entry;
 	u64 sas_address;
 	struct sas_port *port;
 	int next_phy_index;
 	struct list_head phy_list_head;
 	struct hpsa_sas_node *parent_node;
 	struct sas_rphy *rphy;
 };

 struct hpsa_sas_phy {
 	struct list_head phy_list_entry;
 	struct sas_phy *phy;
 	struct hpsa_sas_port *parent_port;
 	bool added_to_port;
 };

 #define EXTERNAL_QD 7
 struct hpsa_scsi_dev_t {
 	unsigned int devtype;
 	int bus, target, lun;		/* as presented to the OS */
 	unsigned char scsi3addr[8];	/* as presented to the HW */
 	u8 physical_device : 1;
 	u8 expose_device;
 	u8 removed : 1;			/* device is marked for death */
 	u8 was_removed : 1;		/* device actually removed */
 #define RAID_CTLR_LUNID "\0\0\0\0\0\0\0\0"
 	unsigned char device_id[16];    /* from inquiry pg. 0x83 */
 	u64 sas_address;
 	u64 eli;			/* from report diags. */
 	unsigned char vendor[8];        /* bytes 8-15 of inquiry data */
 	unsigned char model[16];        /* bytes 16-31 of inquiry data */
 	unsigned char rev;		/* byte 2 of inquiry data */
 	unsigned char raid_level;	/* from inquiry page 0xC1 */
 	unsigned char volume_offline;	/* discovered via TUR or VPD */
 	u16 queue_depth;		/* max queue_depth for this device */
 	atomic_t commands_outstanding;	/* track commands sent to device */
 	atomic_t ioaccel_cmds_out;	/* Only used for physical devices
 					 * counts commands sent to physical
 					 * device via "ioaccel" path.
 					 */
 	bool in_reset;
 	u32 ioaccel_handle;
 	u8 active_path_index;
 	u8 path_map;
 	u8 bay;
 	u8 box[8];
 	u16 phys_connector[8];
 	int offload_config;		/* I/O accel RAID offload configured */
 	int offload_enabled;		/* I/O accel RAID offload enabled */
 	int offload_to_be_enabled;
 	int hba_ioaccel_enabled;
 	int offload_to_mirror;		/* Send next I/O accelerator RAID
 					 * offload request to mirror drive
 					 */
 	struct raid_map_data raid_map;	/* I/O accelerator RAID map */

 	/*
 	 * Pointers from logical drive map indices to the phys drives that
 	 * make those logical drives.  Note, multiple logical drives may
 	 * share physical drives.  You can have for instance 5 physical
 	 * drives with 3 logical drives each using those same 5 physical
 	 * disks. We need these pointers for counting i/o's out to physical
 	 * devices in order to honor physical device queue depth limits.
 	 */
 	struct hpsa_scsi_dev_t *phys_disk[RAID_MAP_MAX_ENTRIES];
 	int nphysical_disks;
 	int supports_aborts;
 	struct hpsa_sas_port *sas_port;
 	int external;   /* 1-from external array 0-not <0-unknown */
 };

 struct reply_queue_buffer {
 	u64 *head;
 	size_t size;
 	u8 wraparound;
 	u32 current_entry;
 	dma_addr_t busaddr;
 };

 #pragma pack(1)
 struct bmic_controller_parameters {
 	u8   led_flags;
 	u8   enable_command_list_verification;
 	u8   backed_out_write_drives;
 	u16  stripes_for_parity;
 	u8   parity_distribution_mode_flags;
 	u16  max_driver_requests;
 	u16  elevator_trend_count;
 	u8   disable_elevator;
 	u8   force_scan_complete;
 	u8   scsi_transfer_mode;
 	u8   force_narrow;
 	u8   rebuild_priority;
 	u8   expand_priority;
 	u8   host_sdb_asic_fix;
 	u8   pdpi_burst_from_host_disabled;
 	char software_name[64];
 	char hardware_name[32];
 	u8   bridge_revision;
 	u8   snapshot_priority;
 	u32  os_specific;
 	u8   post_prompt_timeout;
 	u8   automatic_drive_slamming;
 	u8   reserved1;
 	u8   nvram_flags;
 	u8   cache_nvram_flags;
 	u8   drive_config_flags;
 	u16  reserved2;
 	u8   temp_warning_level;
 	u8   temp_shutdown_level;
 	u8   temp_condition_reset;
 	u8   max_coalesce_commands;
 	u32  max_coalesce_delay;
 	u8   orca_password[4];
 	u8   access_id[16];
 	u8   reserved[356];
 };
 #pragma pack()

 struct ctlr_info {
 	unsigned int *reply_map;
 	int	ctlr;
 	char	devname[8];
 	char    *product_name;
 	struct pci_dev *pdev;
 	u32	board_id;
 	u64	sas_address;
 	void __iomem *vaddr;
 	unsigned long paddr;
 	int 	nr_cmds; /* Number of commands allowed on this controller */
 #define HPSA_CMDS_RESERVED_FOR_ABORTS 2
 #define HPSA_CMDS_RESERVED_FOR_DRIVER 1
 	struct CfgTable __iomem *cfgtable;
 	int	interrupts_enabled;
 	int 	max_commands;
 	int	last_collision_tag; /* tags are global */
 	atomic_t commands_outstanding;
 #	define PERF_MODE_INT	0
 #	define DOORBELL_INT	1
 #	define SIMPLE_MODE_INT	2
 #	define MEMQ_MODE_INT	3
 	unsigned int msix_vectors;
 	int intr_mode; /* either PERF_MODE_INT or SIMPLE_MODE_INT */
 	struct access_method access;

 	/* queue and queue Info */
 	unsigned int Qdepth;
 	unsigned int maxSG;
 	spinlock_t lock;
 	int maxsgentries;
 	u8 max_cmd_sg_entries;
 	int chainsize;
 	struct SGDescriptor **cmd_sg_list;
 	struct ioaccel2_sg_element **ioaccel2_cmd_sg_list;

 	/* pointers to command and error info pool */
 	struct CommandList 	*cmd_pool;
 	dma_addr_t		cmd_pool_dhandle;
 	struct io_accel1_cmd	*ioaccel_cmd_pool;
 	dma_addr_t		ioaccel_cmd_pool_dhandle;
 	struct io_accel2_cmd	*ioaccel2_cmd_pool;
 	dma_addr_t		ioaccel2_cmd_pool_dhandle;
 	struct ErrorInfo 	*errinfo_pool;
 	dma_addr_t		errinfo_pool_dhandle;
 	unsigned long  		*cmd_pool_bits;
 	int			scan_finished;
 	u8			scan_waiting : 1;
 	spinlock_t		scan_lock;
 	wait_queue_head_t	scan_wait_queue;

 	struct Scsi_Host *scsi_host;
 	spinlock_t devlock; /* to protect hba[ctlr]->dev[];  */
 	int ndevices; /* number of used elements in .dev[] array. */
 	struct hpsa_scsi_dev_t *dev[HPSA_MAX_DEVICES];
 	/*
 	 * Performant mode tables.
 	 */
 	u32 trans_support;
 	u32 trans_offset;
 	struct TransTable_struct __iomem *transtable;
 	unsigned long transMethod;

 	/* cap concurrent passthrus at some reasonable maximum */
 #define HPSA_MAX_CONCURRENT_PASSTHRUS (10)
 	atomic_t passthru_cmds_avail;

 	/*
 	 * Performant mode completion buffers
 	 */
 	size_t reply_queue_size;
 	struct reply_queue_buffer reply_queue[MAX_REPLY_QUEUES];
 	u8 nreply_queues;
 	u32 *blockFetchTable;
 	u32 *ioaccel1_blockFetchTable;
 	u32 *ioaccel2_blockFetchTable;
 	u32 __iomem *ioaccel2_bft2_regs;
 	unsigned char *hba_inquiry_data;
 	u32 driver_support;
 	u32 fw_support;
 	int ioaccel_support;
 	int ioaccel_maxsg;
 	u64 last_intr_timestamp;
 	u32 last_heartbeat;
 	u64 last_heartbeat_timestamp;
 	u32 heartbeat_sample_interval;
 	atomic_t firmware_flash_in_progress;
 	u32 __percpu *lockup_detected;
 	struct delayed_work monitor_ctlr_work;
 	struct delayed_work rescan_ctlr_work;
 	struct delayed_work event_monitor_work;
 	int remove_in_progress;
 	/* Address of h->q[x] is passed to intr handler to know which queue */
 	u8 q[MAX_REPLY_QUEUES];
 	char intrname[MAX_REPLY_QUEUES][16];	/* "hpsa0-msix00" names */
 	u32 TMFSupportFlags; /* cache what task mgmt funcs are supported. */
 #define HPSATMF_BITS_SUPPORTED  (1 << 0)
 #define HPSATMF_PHYS_LUN_RESET  (1 << 1)
 #define HPSATMF_PHYS_NEX_RESET  (1 << 2)
 #define HPSATMF_PHYS_TASK_ABORT (1 << 3)
 #define HPSATMF_PHYS_TSET_ABORT (1 << 4)
 #define HPSATMF_PHYS_CLEAR_ACA  (1 << 5)
 #define HPSATMF_PHYS_CLEAR_TSET (1 << 6)
 #define HPSATMF_PHYS_QRY_TASK   (1 << 7)
 #define HPSATMF_PHYS_QRY_TSET   (1 << 8)
 #define HPSATMF_PHYS_QRY_ASYNC  (1 << 9)
 #define HPSATMF_IOACCEL_ENABLED (1 << 15)
 #define HPSATMF_MASK_SUPPORTED  (1 << 16)
 #define HPSATMF_LOG_LUN_RESET   (1 << 17)
 #define HPSATMF_LOG_NEX_RESET   (1 << 18)
 #define HPSATMF_LOG_TASK_ABORT  (1 << 19)
 #define HPSATMF_LOG_TSET_ABORT  (1 << 20)
 #define HPSATMF_LOG_CLEAR_ACA   (1 << 21)
 #define HPSATMF_LOG_CLEAR_TSET  (1 << 22)
 #define HPSATMF_LOG_QRY_TASK    (1 << 23)
 #define HPSATMF_LOG_QRY_TSET    (1 << 24)
 #define HPSATMF_LOG_QRY_ASYNC   (1 << 25)
 	u32 events;
 #define CTLR_STATE_CHANGE_EVENT				(1 << 0)
 #define CTLR_ENCLOSURE_HOT_PLUG_EVENT			(1 << 1)
 #define CTLR_STATE_CHANGE_EVENT_PHYSICAL_DRV		(1 << 4)
 #define CTLR_STATE_CHANGE_EVENT_LOGICAL_DRV		(1 << 5)
 #define CTLR_STATE_CHANGE_EVENT_REDUNDANT_CNTRL		(1 << 6)
 #define CTLR_STATE_CHANGE_EVENT_AIO_ENABLED_DISABLED	(1 << 30)
 #define CTLR_STATE_CHANGE_EVENT_AIO_CONFIG_CHANGE	(1 << 31)

 #define RESCAN_REQUIRED_EVENT_BITS \
 		(CTLR_ENCLOSURE_HOT_PLUG_EVENT | \
 		CTLR_STATE_CHANGE_EVENT_PHYSICAL_DRV | \
 		CTLR_STATE_CHANGE_EVENT_LOGICAL_DRV | \
 		CTLR_STATE_CHANGE_EVENT_AIO_ENABLED_DISABLED | \
 		CTLR_STATE_CHANGE_EVENT_AIO_CONFIG_CHANGE)
 	spinlock_t offline_device_lock;
 	struct list_head offline_device_list;
 	int	acciopath_status;
 	int	drv_req_rescan;
 	int	raid_offload_debug;
 	int     discovery_polling;
 	int     legacy_board;
 	struct  ReportLUNdata *lastlogicals;
 	int	needs_abort_tags_swizzled;
 	struct workqueue_struct *resubmit_wq;
 	struct workqueue_struct *rescan_ctlr_wq;
 	struct workqueue_struct *monitor_ctlr_wq;
 	atomic_t abort_cmds_available;
 	wait_queue_head_t event_sync_wait_queue;
 	struct mutex reset_mutex;
 	u8 reset_in_progress;
 	struct hpsa_sas_node *sas_host;
 	spinlock_t reset_lock;
 };

 struct offline_device_entry {
 	unsigned char scsi3addr[8];
 	struct list_head offline_list;
 };

 #define HPSA_ABORT_MSG 0
 #define HPSA_DEVICE_RESET_MSG 1
 #define HPSA_RESET_TYPE_CONTROLLER 0x00
 #define HPSA_RESET_TYPE_BUS 0x01
 #define HPSA_RESET_TYPE_LUN 0x04
 #define HPSA_PHYS_TARGET_RESET 0x99 /* not defined by cciss spec */
 #define HPSA_MSG_SEND_RETRY_LIMIT 10
 #define HPSA_MSG_SEND_RETRY_INTERVAL_MSECS (10000)

 /* Maximum time in seconds driver will wait for command completions
  * when polling before giving up.
  */
 #define HPSA_MAX_POLL_TIME_SECS (20)

 /* During SCSI error recovery, HPSA_TUR_RETRY_LIMIT defines
  * how many times to retry TEST UNIT READY on a device
  * while waiting for it to become ready before giving up.
  * HPSA_MAX_WAIT_INTERVAL_SECS is the max wait interval
  * between sending TURs while waiting for a device
  * to become ready.
  */
 #define HPSA_TUR_RETRY_LIMIT (20)
 #define HPSA_MAX_WAIT_INTERVAL_SECS (30)

 /* HPSA_BOARD_READY_WAIT_SECS is how long to wait for a board
  * to become ready, in seconds, before giving up on it.
  * HPSA_BOARD_READY_POLL_INTERVAL_MSECS * is how long to wait
  * between polling the board to see if it is ready, in
  * milliseconds.  HPSA_BOARD_READY_POLL_INTERVAL and
  * HPSA_BOARD_READY_ITERATIONS are derived from those.
  */
 #define HPSA_BOARD_READY_WAIT_SECS (120)
 #define HPSA_BOARD_NOT_READY_WAIT_SECS (100)
 #define HPSA_BOARD_READY_POLL_INTERVAL_MSECS (100)
 #define HPSA_BOARD_READY_POLL_INTERVAL \
 	((HPSA_BOARD_READY_POLL_INTERVAL_MSECS * HZ) / 1000)
 #define HPSA_BOARD_READY_ITERATIONS \
 	((HPSA_BOARD_READY_WAIT_SECS * 1000) / \
 		HPSA_BOARD_READY_POLL_INTERVAL_MSECS)
 #define HPSA_BOARD_NOT_READY_ITERATIONS \
 	((HPSA_BOARD_NOT_READY_WAIT_SECS * 1000) / \
 		HPSA_BOARD_READY_POLL_INTERVAL_MSECS)
 #define HPSA_POST_RESET_PAUSE_MSECS (3000)
 #define HPSA_POST_RESET_NOOP_RETRIES (12)

 /*  Defining the diffent access_menthods */
 /*
  * Memory mapped FIFO interface (SMART 53xx cards)
  */
 #define SA5_DOORBELL	0x20
 #define SA5_REQUEST_PORT_OFFSET	0x40
 #define SA5_REQUEST_PORT64_LO_OFFSET 0xC0
 #define SA5_REQUEST_PORT64_HI_OFFSET 0xC4
 #define SA5_REPLY_INTR_MASK_OFFSET	0x34
 #define SA5_REPLY_PORT_OFFSET		0x44
 #define SA5_INTR_STATUS		0x30
 #define SA5_SCRATCHPAD_OFFSET	0xB0

 #define SA5_CTCFG_OFFSET	0xB4
 #define SA5_CTMEM_OFFSET	0xB8

 #define SA5_INTR_OFF		0x08
 #define SA5B_INTR_OFF		0x04
 #define SA5_INTR_PENDING	0x08
 #define SA5B_INTR_PENDING	0x04
 #define FIFO_EMPTY		0xffffffff
 #define HPSA_FIRMWARE_READY	0xffff0000 /* value in scratchpad register */

 #define HPSA_ERROR_BIT		0x02

 /* Performant mode flags */
 #define SA5_PERF_INTR_PENDING   0x04
 #define SA5_PERF_INTR_OFF       0x05
 #define SA5_OUTDB_STATUS_PERF_BIT       0x01
 #define SA5_OUTDB_CLEAR_PERF_BIT        0x01
 #define SA5_OUTDB_CLEAR         0xA0
 #define SA5_OUTDB_CLEAR_PERF_BIT        0x01
 #define SA5_OUTDB_STATUS        0x9C


 #define HPSA_INTR_ON 	1
 #define HPSA_INTR_OFF	0

 /*
  * Inbound Post Queue offsets for IO Accelerator Mode 2
  */
 #define IOACCEL2_INBOUND_POSTQ_32	0x48
 #define IOACCEL2_INBOUND_POSTQ_64_LOW	0xd0
 #define IOACCEL2_INBOUND_POSTQ_64_HI	0xd4

 #define HPSA_PHYSICAL_DEVICE_BUS	0
 #define HPSA_RAID_VOLUME_BUS		1
 #define HPSA_EXTERNAL_RAID_VOLUME_BUS	2
 #define HPSA_HBA_BUS			0
 #define HPSA_LEGACY_HBA_BUS		3

 /*
 	Send the command to the hardware
 */
 static void SA5_submit_command(struct ctlr_info *h,
 	struct CommandList *c)
 {
 	writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
 	(void) readl(h->vaddr + SA5_SCRATCHPAD_OFFSET);
 }

 static void SA5_submit_command_no_read(struct ctlr_info *h,
 	struct CommandList *c)
 {
 	writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
 }

 static void SA5_submit_command_ioaccel2(struct ctlr_info *h,
 	struct CommandList *c)
 {
 	writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
 }

 /*
  *  This card is the opposite of the other cards.
  *   0 turns interrupts on...
  *   0x08 turns them off...
  */
 static void SA5_intr_mask(struct ctlr_info *h, unsigned long val)
 {
 	if (val) { /* Turn interrupts on */
 		h->interrupts_enabled = 1;
 		writel(0, h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
 		(void) readl(h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
 	} else { /* Turn them off */
 		h->interrupts_enabled = 0;
 		writel(SA5_INTR_OFF,
 			h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
 		(void) readl(h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
 	}
 }

 /*
  *  Variant of the above; 0x04 turns interrupts off...
  */
 static void SA5B_intr_mask(struct ctlr_info *h, unsigned long val)
 {
 	if (val) { /* Turn interrupts on */
 		h->interrupts_enabled = 1;
 		writel(0, h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
 		(void) readl(h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
 	} else { /* Turn them off */
 		h->interrupts_enabled = 0;
 		writel(SA5B_INTR_OFF,
 		       h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
 		(void) readl(h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
 	}
 }

 static void SA5_performant_intr_mask(struct ctlr_info *h, unsigned long val)
 {
 	if (val) { /* turn on interrupts */
 		h->interrupts_enabled = 1;
 		writel(0, h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
 		(void) readl(h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
 	} else {
 		h->interrupts_enabled = 0;
 		writel(SA5_PERF_INTR_OFF,
 			h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
 		(void) readl(h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
 	}
 }

 static unsigned long SA5_performant_completed(struct ctlr_info *h, u8 q)
 {
 	struct reply_queue_buffer *rq = &h->reply_queue[q];
 	unsigned long register_value = FIFO_EMPTY;

 	/* msi auto clears the interrupt pending bit. */
 	if (unlikely(!(h->pdev->msi_enabled || h->msix_vectors))) {
 		/* flush the controller write of the reply queue by reading
 		 * outbound doorbell status register.
 		 */
 		(void) readl(h->vaddr + SA5_OUTDB_STATUS);
 		writel(SA5_OUTDB_CLEAR_PERF_BIT, h->vaddr + SA5_OUTDB_CLEAR);
 		/* Do a read in order to flush the write to the controller
 		 * (as per spec.)
 		 */
 		(void) readl(h->vaddr + SA5_OUTDB_STATUS);
 	}

 	if ((((u32) rq->head[rq->current_entry]) & 1) == rq->wraparound) {
 		register_value = rq->head[rq->current_entry];
 		rq->current_entry++;
 		atomic_dec(&h->commands_outstanding);
 	} else {
 		register_value = FIFO_EMPTY;
 	}
 	/* Check for wraparound */
 	if (rq->current_entry == h->max_commands) {
 		rq->current_entry = 0;
 		rq->wraparound ^= 1;
 	}
 	return register_value;
 }

 /*
  *   returns value read from hardware.
  *     returns FIFO_EMPTY if there is nothing to read
  */
 static unsigned long SA5_completed(struct ctlr_info *h,
 	__attribute__((unused)) u8 q)
 {
 	unsigned long register_value
 		= readl(h->vaddr + SA5_REPLY_PORT_OFFSET);

 	if (register_value != FIFO_EMPTY)
 		atomic_dec(&h->commands_outstanding);

 #ifdef HPSA_DEBUG
 	if (register_value != FIFO_EMPTY)
 		dev_dbg(&h->pdev->dev, "Read %lx back from board\n",
 			register_value);
 	else
 		dev_dbg(&h->pdev->dev, "FIFO Empty read\n");
 #endif

 	return register_value;
 }
 /*
  *	Returns true if an interrupt is pending..
  */
 static bool SA5_intr_pending(struct ctlr_info *h)
 {
 	unsigned long register_value  =
 		readl(h->vaddr + SA5_INTR_STATUS);
 	return register_value & SA5_INTR_PENDING;
 }

 static bool SA5_performant_intr_pending(struct ctlr_info *h)
 {
 	unsigned long register_value = readl(h->vaddr + SA5_INTR_STATUS);

 	if (!register_value)
 		return false;

 	/* Read outbound doorbell to flush */
 	register_value = readl(h->vaddr + SA5_OUTDB_STATUS);
 	return register_value & SA5_OUTDB_STATUS_PERF_BIT;
 }

 #define SA5_IOACCEL_MODE1_INTR_STATUS_CMP_BIT    0x100

 static bool SA5_ioaccel_mode1_intr_pending(struct ctlr_info *h)
 {
 	unsigned long register_value = readl(h->vaddr + SA5_INTR_STATUS);

 	return (register_value & SA5_IOACCEL_MODE1_INTR_STATUS_CMP_BIT) ?
 		true : false;
 }

 /*
  *      Returns true if an interrupt is pending..
  */
 static bool SA5B_intr_pending(struct ctlr_info *h)
 {
 	return readl(h->vaddr + SA5_INTR_STATUS) & SA5B_INTR_PENDING;
 }

 #define IOACCEL_MODE1_REPLY_QUEUE_INDEX  0x1A0
 #define IOACCEL_MODE1_PRODUCER_INDEX     0x1B8
 #define IOACCEL_MODE1_CONSUMER_INDEX     0x1BC
 #define IOACCEL_MODE1_REPLY_UNUSED       0xFFFFFFFFFFFFFFFFULL

 static unsigned long SA5_ioaccel_mode1_completed(struct ctlr_info *h, u8 q)
 {
 	u64 register_value;
 	struct reply_queue_buffer *rq = &h->reply_queue[q];

 	BUG_ON(q >= h->nreply_queues);

 	register_value = rq->head[rq->current_entry];
 	if (register_value != IOACCEL_MODE1_REPLY_UNUSED) {
 		rq->head[rq->current_entry] = IOACCEL_MODE1_REPLY_UNUSED;
 		if (++rq->current_entry == rq->size)
 			rq->current_entry = 0;
 		/*
 		 * @todo
 		 *
 		 * Don't really need to write the new index after each command,
 		 * but with current driver design this is easiest.
 		 */
 		wmb();
 		writel((q << 24) | rq->current_entry, h->vaddr +
 				IOACCEL_MODE1_CONSUMER_INDEX);
 		atomic_dec(&h->commands_outstanding);
 	}
 	return (unsigned long) register_value;
 }

 static struct access_method SA5_access = {
 	.submit_command =	SA5_submit_command,
 	.set_intr_mask =	SA5_intr_mask,
 	.intr_pending =		SA5_intr_pending,
 	.command_completed =	SA5_completed,
 };

 /* Duplicate entry of the above to mark unsupported boards */
 static struct access_method SA5A_access = {
 	.submit_command =	SA5_submit_command,
 	.set_intr_mask =	SA5_intr_mask,
 	.intr_pending =		SA5_intr_pending,
 	.command_completed =	SA5_completed,
 };

 static struct access_method SA5B_access = {
 	.submit_command =	SA5_submit_command,
 	.set_intr_mask =	SA5B_intr_mask,
 	.intr_pending =		SA5B_intr_pending,
 	.command_completed =	SA5_completed,
 };

 static struct access_method SA5_ioaccel_mode1_access = {
 	.submit_command =	SA5_submit_command,
 	.set_intr_mask =	SA5_performant_intr_mask,
 	.intr_pending =		SA5_ioaccel_mode1_intr_pending,
 	.command_completed =	SA5_ioaccel_mode1_completed,
 };

 static struct access_method SA5_ioaccel_mode2_access = {
 	.submit_command =	SA5_submit_command_ioaccel2,
 	.set_intr_mask =	SA5_performant_intr_mask,
 	.intr_pending =		SA5_performant_intr_pending,
 	.command_completed =	SA5_performant_completed,
 };

 static struct access_method SA5_performant_access = {
 	.submit_command =	SA5_submit_command,
 	.set_intr_mask =	SA5_performant_intr_mask,
 	.intr_pending =		SA5_performant_intr_pending,
 	.command_completed =	SA5_performant_completed,
 };

 static struct access_method SA5_performant_access_no_read = {
 	.submit_command =	SA5_submit_command_no_read,
 	.set_intr_mask =	SA5_performant_intr_mask,
 	.intr_pending =		SA5_performant_intr_pending,
 	.command_completed =	SA5_performant_completed,
 };

 struct board_type {
 	u32	board_id;
 	char	*product_name;
 	struct access_method *access;
 };

 #endif /* HPSA_H */
	/*
	* Disk Array driver for HP Smart Array SAS controllers
	* Copyright 2016 Microsemi Corporation
	* Copyright 2014-2015 PMC-Sierra, Inc.
	* Copyright 2000,2009-2015 Hewlett-Packard Development Company, L.P.
	*
	* 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; version 2 of the License.
	*
	* 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, GOOD TITLE or
	* NON INFRINGEMENT. See the GNU General Public License for more details.
	*
	* Questions/Comments/Bugfixes to [email protected]
	*
	*/
	#ifndef HPSA_H
	#define HPSA_H

	#include <scsi/scsicam.h>

	#define IO_OK 0
	#define IO_ERROR 1

	struct ctlr_info;

	struct access_method {
	void (submit_command)(struct ctlr_info h,
	struct CommandList *c);
	void (set_intr_mask)(struct ctlr_info h, unsigned long val);
	bool (intr_pending)(struct ctlr_info h);
	unsigned long (command_completed)(struct ctlr_info h, u8 q);
	};

	/* for SAS hosts and SAS expanders */
	struct hpsa_sas_node {
	struct device *parent_dev;
	struct list_head port_list_head;
	};

	struct hpsa_sas_port {
	struct list_head port_list_entry;
	u64 sas_address;
	struct sas_port *port;
	int next_phy_index;
	struct list_head phy_list_head;
	struct hpsa_sas_node *parent_node;
	struct sas_rphy *rphy;
	};

	struct hpsa_sas_phy {
	struct list_head phy_list_entry;
	struct sas_phy *phy;
	struct hpsa_sas_port *parent_port;
	bool added_to_port;
	};

	#define EXTERNAL_QD 7
	struct hpsa_scsi_dev_t {
	unsigned int devtype;
	int bus, target, lun; /* as presented to the OS */
	unsigned char scsi3addr[8]; /* as presented to the HW */
	u8 physical_device : 1;
	u8 expose_device;
	u8 removed : 1; /* device is marked for death */
	u8 was_removed : 1; /* device actually removed */
	#define RAID_CTLR_LUNID "\0\0\0\0\0\0\0\0"
	unsigned char device_id[16]; /* from inquiry pg. 0x83 */
	u64 sas_address;
	u64 eli; /* from report diags. */
	unsigned char vendor[8]; /* bytes 8-15 of inquiry data */
	unsigned char model[16]; /* bytes 16-31 of inquiry data */
	unsigned char rev; /* byte 2 of inquiry data */
	unsigned char raid_level; /* from inquiry page 0xC1 */
	unsigned char volume_offline; /* discovered via TUR or VPD */
	u16 queue_depth; /* max queue_depth for this device */
	atomic_t commands_outstanding; /* track commands sent to device */
	atomic_t ioaccel_cmds_out; /* Only used for physical devices
	* counts commands sent to physical
	* device via "ioaccel" path.
	*/
	bool in_reset;
	u32 ioaccel_handle;
	u8 active_path_index;
	u8 path_map;
	u8 bay;
	u8 box[8];
	u16 phys_connector[8];
	int offload_config; /* I/O accel RAID offload configured */
	int offload_enabled; /* I/O accel RAID offload enabled */
	int offload_to_be_enabled;
	int hba_ioaccel_enabled;
	int offload_to_mirror; /* Send next I/O accelerator RAID
	* offload request to mirror drive
	*/
	struct raid_map_data raid_map; /* I/O accelerator RAID map */

	/*
	* Pointers from logical drive map indices to the phys drives that
	* make those logical drives. Note, multiple logical drives may
	* share physical drives. You can have for instance 5 physical
	* drives with 3 logical drives each using those same 5 physical
	* disks. We need these pointers for counting i/o's out to physical
	* devices in order to honor physical device queue depth limits.
	*/
	struct hpsa_scsi_dev_t *phys_disk[RAID_MAP_MAX_ENTRIES];
	int nphysical_disks;
	int supports_aborts;
	struct hpsa_sas_port *sas_port;
	int external; /* 1-from external array 0-not <0-unknown */
	};

	struct reply_queue_buffer {
	u64 *head;
	size_t size;
	u8 wraparound;
	u32 current_entry;
	dma_addr_t busaddr;
	};

	#pragma pack(1)
	struct bmic_controller_parameters {
	u8 led_flags;
	u8 enable_command_list_verification;
	u8 backed_out_write_drives;
	u16 stripes_for_parity;
	u8 parity_distribution_mode_flags;
	u16 max_driver_requests;
	u16 elevator_trend_count;
	u8 disable_elevator;
	u8 force_scan_complete;
	u8 scsi_transfer_mode;
	u8 force_narrow;
	u8 rebuild_priority;
	u8 expand_priority;
	u8 host_sdb_asic_fix;
	u8 pdpi_burst_from_host_disabled;
	char software_name[64];
	char hardware_name[32];
	u8 bridge_revision;
	u8 snapshot_priority;
	u32 os_specific;
	u8 post_prompt_timeout;
	u8 automatic_drive_slamming;
	u8 reserved1;
	u8 nvram_flags;
	u8 cache_nvram_flags;
	u8 drive_config_flags;
	u16 reserved2;
	u8 temp_warning_level;
	u8 temp_shutdown_level;
	u8 temp_condition_reset;
	u8 max_coalesce_commands;
	u32 max_coalesce_delay;
	u8 orca_password[4];
	u8 access_id[16];
	u8 reserved[356];
	};
	#pragma pack()

	struct ctlr_info {
	unsigned int *reply_map;
	int ctlr;
	char devname[8];
	char *product_name;
	struct pci_dev *pdev;
	u32 board_id;
	u64 sas_address;
	void __iomem *vaddr;
	unsigned long paddr;
	int nr_cmds; /* Number of commands allowed on this controller */
	#define HPSA_CMDS_RESERVED_FOR_ABORTS 2
	#define HPSA_CMDS_RESERVED_FOR_DRIVER 1
	struct CfgTable __iomem *cfgtable;
	int interrupts_enabled;
	int max_commands;
	int last_collision_tag; /* tags are global */
	atomic_t commands_outstanding;
	# define PERF_MODE_INT 0
	# define DOORBELL_INT 1
	# define SIMPLE_MODE_INT 2
	# define MEMQ_MODE_INT 3
	unsigned int msix_vectors;
	int intr_mode; /* either PERF_MODE_INT or SIMPLE_MODE_INT */
	struct access_method access;

	/* queue and queue Info */
	unsigned int Qdepth;
	unsigned int maxSG;
	spinlock_t lock;
	int maxsgentries;
	u8 max_cmd_sg_entries;
	int chainsize;
	struct SGDescriptor **cmd_sg_list;
	struct ioaccel2_sg_element **ioaccel2_cmd_sg_list;

	/* pointers to command and error info pool */
	struct CommandList *cmd_pool;
	dma_addr_t cmd_pool_dhandle;
	struct io_accel1_cmd *ioaccel_cmd_pool;
	dma_addr_t ioaccel_cmd_pool_dhandle;
	struct io_accel2_cmd *ioaccel2_cmd_pool;
	dma_addr_t ioaccel2_cmd_pool_dhandle;
	struct ErrorInfo *errinfo_pool;
	dma_addr_t errinfo_pool_dhandle;
	unsigned long *cmd_pool_bits;
	int scan_finished;
	u8 scan_waiting : 1;
	spinlock_t scan_lock;
	wait_queue_head_t scan_wait_queue;

	struct Scsi_Host *scsi_host;
	spinlock_t devlock; /* to protect hba[ctlr]->dev[]; */
	int ndevices; /* number of used elements in .dev[] array. */
	struct hpsa_scsi_dev_t *dev[HPSA_MAX_DEVICES];
	/*
	* Performant mode tables.
	*/
	u32 trans_support;
	u32 trans_offset;
	struct TransTable_struct __iomem *transtable;
	unsigned long transMethod;

	/* cap concurrent passthrus at some reasonable maximum */
	#define HPSA_MAX_CONCURRENT_PASSTHRUS (10)
	atomic_t passthru_cmds_avail;

	/*
	* Performant mode completion buffers
	*/
	size_t reply_queue_size;
	struct reply_queue_buffer reply_queue[MAX_REPLY_QUEUES];
	u8 nreply_queues;
	u32 *blockFetchTable;
	u32 *ioaccel1_blockFetchTable;
	u32 *ioaccel2_blockFetchTable;
	u32 __iomem *ioaccel2_bft2_regs;
	unsigned char *hba_inquiry_data;
	u32 driver_support;
	u32 fw_support;
	int ioaccel_support;
	int ioaccel_maxsg;
	u64 last_intr_timestamp;
	u32 last_heartbeat;
	u64 last_heartbeat_timestamp;
	u32 heartbeat_sample_interval;
	atomic_t firmware_flash_in_progress;
	u32 __percpu *lockup_detected;
	struct delayed_work monitor_ctlr_work;
	struct delayed_work rescan_ctlr_work;
	struct delayed_work event_monitor_work;
	int remove_in_progress;
	/* Address of h->q[x] is passed to intr handler to know which queue */
	u8 q[MAX_REPLY_QUEUES];
	char intrname[MAX_REPLY_QUEUES][16]; /* "hpsa0-msix00" names */
	u32 TMFSupportFlags; /* cache what task mgmt funcs are supported. */
	#define HPSATMF_BITS_SUPPORTED (1 << 0)
	#define HPSATMF_PHYS_LUN_RESET (1 << 1)
	#define HPSATMF_PHYS_NEX_RESET (1 << 2)
	#define HPSATMF_PHYS_TASK_ABORT (1 << 3)
	#define HPSATMF_PHYS_TSET_ABORT (1 << 4)
	#define HPSATMF_PHYS_CLEAR_ACA (1 << 5)
	#define HPSATMF_PHYS_CLEAR_TSET (1 << 6)
	#define HPSATMF_PHYS_QRY_TASK (1 << 7)
	#define HPSATMF_PHYS_QRY_TSET (1 << 8)
	#define HPSATMF_PHYS_QRY_ASYNC (1 << 9)
	#define HPSATMF_IOACCEL_ENABLED (1 << 15)
	#define HPSATMF_MASK_SUPPORTED (1 << 16)
	#define HPSATMF_LOG_LUN_RESET (1 << 17)
	#define HPSATMF_LOG_NEX_RESET (1 << 18)
	#define HPSATMF_LOG_TASK_ABORT (1 << 19)
	#define HPSATMF_LOG_TSET_ABORT (1 << 20)
	#define HPSATMF_LOG_CLEAR_ACA (1 << 21)
	#define HPSATMF_LOG_CLEAR_TSET (1 << 22)
	#define HPSATMF_LOG_QRY_TASK (1 << 23)
	#define HPSATMF_LOG_QRY_TSET (1 << 24)
	#define HPSATMF_LOG_QRY_ASYNC (1 << 25)
	u32 events;
	#define CTLR_STATE_CHANGE_EVENT (1 << 0)
	#define CTLR_ENCLOSURE_HOT_PLUG_EVENT (1 << 1)
	#define CTLR_STATE_CHANGE_EVENT_PHYSICAL_DRV (1 << 4)
	#define CTLR_STATE_CHANGE_EVENT_LOGICAL_DRV (1 << 5)
	#define CTLR_STATE_CHANGE_EVENT_REDUNDANT_CNTRL (1 << 6)
	#define CTLR_STATE_CHANGE_EVENT_AIO_ENABLED_DISABLED (1 << 30)
	#define CTLR_STATE_CHANGE_EVENT_AIO_CONFIG_CHANGE (1 << 31)

	#define RESCAN_REQUIRED_EVENT_BITS \
	(CTLR_ENCLOSURE_HOT_PLUG_EVENT \| \
	CTLR_STATE_CHANGE_EVENT_PHYSICAL_DRV \| \
	CTLR_STATE_CHANGE_EVENT_LOGICAL_DRV \| \
	CTLR_STATE_CHANGE_EVENT_AIO_ENABLED_DISABLED \| \
	CTLR_STATE_CHANGE_EVENT_AIO_CONFIG_CHANGE)
	spinlock_t offline_device_lock;
	struct list_head offline_device_list;
	int acciopath_status;
	int drv_req_rescan;
	int raid_offload_debug;
	int discovery_polling;
	int legacy_board;
	struct ReportLUNdata *lastlogicals;
	int needs_abort_tags_swizzled;
	struct workqueue_struct *resubmit_wq;
	struct workqueue_struct *rescan_ctlr_wq;
	struct workqueue_struct *monitor_ctlr_wq;
	atomic_t abort_cmds_available;
	wait_queue_head_t event_sync_wait_queue;
	struct mutex reset_mutex;
	u8 reset_in_progress;
	struct hpsa_sas_node *sas_host;
	spinlock_t reset_lock;
	};

	struct offline_device_entry {
	unsigned char scsi3addr[8];
	struct list_head offline_list;
	};

	#define HPSA_ABORT_MSG 0
	#define HPSA_DEVICE_RESET_MSG 1
	#define HPSA_RESET_TYPE_CONTROLLER 0x00
	#define HPSA_RESET_TYPE_BUS 0x01
	#define HPSA_RESET_TYPE_LUN 0x04
	#define HPSA_PHYS_TARGET_RESET 0x99 /* not defined by cciss spec */
	#define HPSA_MSG_SEND_RETRY_LIMIT 10
	#define HPSA_MSG_SEND_RETRY_INTERVAL_MSECS (10000)

	/* Maximum time in seconds driver will wait for command completions
	* when polling before giving up.
	*/
	#define HPSA_MAX_POLL_TIME_SECS (20)

	/* During SCSI error recovery, HPSA_TUR_RETRY_LIMIT defines
	* how many times to retry TEST UNIT READY on a device
	* while waiting for it to become ready before giving up.
	* HPSA_MAX_WAIT_INTERVAL_SECS is the max wait interval
	* between sending TURs while waiting for a device
	* to become ready.
	*/
	#define HPSA_TUR_RETRY_LIMIT (20)
	#define HPSA_MAX_WAIT_INTERVAL_SECS (30)

	/* HPSA_BOARD_READY_WAIT_SECS is how long to wait for a board
	* to become ready, in seconds, before giving up on it.
	* HPSA_BOARD_READY_POLL_INTERVAL_MSECS * is how long to wait
	* between polling the board to see if it is ready, in
	* milliseconds. HPSA_BOARD_READY_POLL_INTERVAL and
	* HPSA_BOARD_READY_ITERATIONS are derived from those.
	*/
	#define HPSA_BOARD_READY_WAIT_SECS (120)
	#define HPSA_BOARD_NOT_READY_WAIT_SECS (100)
	#define HPSA_BOARD_READY_POLL_INTERVAL_MSECS (100)
	#define HPSA_BOARD_READY_POLL_INTERVAL \
	((HPSA_BOARD_READY_POLL_INTERVAL_MSECS * HZ) / 1000)
	#define HPSA_BOARD_READY_ITERATIONS \
	((HPSA_BOARD_READY_WAIT_SECS * 1000) / \
	HPSA_BOARD_READY_POLL_INTERVAL_MSECS)
	#define HPSA_BOARD_NOT_READY_ITERATIONS \
	((HPSA_BOARD_NOT_READY_WAIT_SECS * 1000) / \
	HPSA_BOARD_READY_POLL_INTERVAL_MSECS)
	#define HPSA_POST_RESET_PAUSE_MSECS (3000)
	#define HPSA_POST_RESET_NOOP_RETRIES (12)

	/* Defining the diffent access_menthods */
	/*
	* Memory mapped FIFO interface (SMART 53xx cards)
	*/
	#define SA5_DOORBELL 0x20
	#define SA5_REQUEST_PORT_OFFSET 0x40
	#define SA5_REQUEST_PORT64_LO_OFFSET 0xC0
	#define SA5_REQUEST_PORT64_HI_OFFSET 0xC4
	#define SA5_REPLY_INTR_MASK_OFFSET 0x34
	#define SA5_REPLY_PORT_OFFSET 0x44
	#define SA5_INTR_STATUS 0x30
	#define SA5_SCRATCHPAD_OFFSET 0xB0

	#define SA5_CTCFG_OFFSET 0xB4
	#define SA5_CTMEM_OFFSET 0xB8

	#define SA5_INTR_OFF 0x08
	#define SA5B_INTR_OFF 0x04
	#define SA5_INTR_PENDING 0x08
	#define SA5B_INTR_PENDING 0x04
	#define FIFO_EMPTY 0xffffffff
	#define HPSA_FIRMWARE_READY 0xffff0000 /* value in scratchpad register */

	#define HPSA_ERROR_BIT 0x02

	/* Performant mode flags */
	#define SA5_PERF_INTR_PENDING 0x04
	#define SA5_PERF_INTR_OFF 0x05
	#define SA5_OUTDB_STATUS_PERF_BIT 0x01
	#define SA5_OUTDB_CLEAR_PERF_BIT 0x01
	#define SA5_OUTDB_CLEAR 0xA0
	#define SA5_OUTDB_CLEAR_PERF_BIT 0x01
	#define SA5_OUTDB_STATUS 0x9C


	#define HPSA_INTR_ON 1
	#define HPSA_INTR_OFF 0

	/*
	* Inbound Post Queue offsets for IO Accelerator Mode 2
	*/
	#define IOACCEL2_INBOUND_POSTQ_32 0x48
	#define IOACCEL2_INBOUND_POSTQ_64_LOW 0xd0
	#define IOACCEL2_INBOUND_POSTQ_64_HI 0xd4

	#define HPSA_PHYSICAL_DEVICE_BUS 0
	#define HPSA_RAID_VOLUME_BUS 1
	#define HPSA_EXTERNAL_RAID_VOLUME_BUS 2
	#define HPSA_HBA_BUS 0
	#define HPSA_LEGACY_HBA_BUS 3

	/*
	Send the command to the hardware
	*/
	static void SA5_submit_command(struct ctlr_info *h,
	struct CommandList *c)
	{
	writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
	(void) readl(h->vaddr + SA5_SCRATCHPAD_OFFSET);
	}

	static void SA5_submit_command_no_read(struct ctlr_info *h,
	struct CommandList *c)
	{
	writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
	}

	static void SA5_submit_command_ioaccel2(struct ctlr_info *h,
	struct CommandList *c)
	{
	writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
	}

	/*
	* This card is the opposite of the other cards.
	* 0 turns interrupts on...
	* 0x08 turns them off...
	*/
	static void SA5_intr_mask(struct ctlr_info *h, unsigned long val)
	{
	if (val) { /* Turn interrupts on */
	h->interrupts_enabled = 1;
	writel(0, h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
	(void) readl(h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
	} else { /* Turn them off */
	h->interrupts_enabled = 0;
	writel(SA5_INTR_OFF,
	h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
	(void) readl(h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
	}
	}

	/*
	* Variant of the above; 0x04 turns interrupts off...
	*/
	static void SA5B_intr_mask(struct ctlr_info *h, unsigned long val)
	{
	if (val) { /* Turn interrupts on */
	h->interrupts_enabled = 1;
	writel(0, h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
	(void) readl(h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
	} else { /* Turn them off */
	h->interrupts_enabled = 0;
	writel(SA5B_INTR_OFF,
	h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
	(void) readl(h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
	}
	}

	static void SA5_performant_intr_mask(struct ctlr_info *h, unsigned long val)
	{
	if (val) { /* turn on interrupts */
	h->interrupts_enabled = 1;
	writel(0, h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
	(void) readl(h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
	} else {
	h->interrupts_enabled = 0;
	writel(SA5_PERF_INTR_OFF,
	h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
	(void) readl(h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
	}
	}

	static unsigned long SA5_performant_completed(struct ctlr_info *h, u8 q)
	{
	struct reply_queue_buffer *rq = &h->reply_queue[q];
	unsigned long register_value = FIFO_EMPTY;

	/* msi auto clears the interrupt pending bit. */
	if (unlikely(!(h->pdev->msi_enabled \|\| h->msix_vectors))) {
	/* flush the controller write of the reply queue by reading
	* outbound doorbell status register.
	*/
	(void) readl(h->vaddr + SA5_OUTDB_STATUS);
	writel(SA5_OUTDB_CLEAR_PERF_BIT, h->vaddr + SA5_OUTDB_CLEAR);
	/* Do a read in order to flush the write to the controller
	* (as per spec.)
	*/
	(void) readl(h->vaddr + SA5_OUTDB_STATUS);
	}

	if ((((u32) rq->head[rq->current_entry]) & 1) == rq->wraparound) {
	register_value = rq->head[rq->current_entry];
	rq->current_entry++;
	atomic_dec(&h->commands_outstanding);
	} else {
	register_value = FIFO_EMPTY;
	}
	/* Check for wraparound */
	if (rq->current_entry == h->max_commands) {
	rq->current_entry = 0;
	rq->wraparound ^= 1;
	}
	return register_value;
	}

	/*
	* returns value read from hardware.
	* returns FIFO_EMPTY if there is nothing to read
	*/
	static unsigned long SA5_completed(struct ctlr_info *h,
	__attribute__((unused)) u8 q)
	{
	unsigned long register_value
	= readl(h->vaddr + SA5_REPLY_PORT_OFFSET);

	if (register_value != FIFO_EMPTY)
	atomic_dec(&h->commands_outstanding);

	#ifdef HPSA_DEBUG
	if (register_value != FIFO_EMPTY)
	dev_dbg(&h->pdev->dev, "Read %lx back from board\n",
	register_value);
	else
	dev_dbg(&h->pdev->dev, "FIFO Empty read\n");
	#endif

	return register_value;
	}
	/*
	* Returns true if an interrupt is pending..
	*/
	static bool SA5_intr_pending(struct ctlr_info *h)
	{
	unsigned long register_value =
	readl(h->vaddr + SA5_INTR_STATUS);
	return register_value & SA5_INTR_PENDING;
	}

	static bool SA5_performant_intr_pending(struct ctlr_info *h)
	{
	unsigned long register_value = readl(h->vaddr + SA5_INTR_STATUS);

	if (!register_value)
	return false;

	/* Read outbound doorbell to flush */
	register_value = readl(h->vaddr + SA5_OUTDB_STATUS);
	return register_value & SA5_OUTDB_STATUS_PERF_BIT;
	}

	#define SA5_IOACCEL_MODE1_INTR_STATUS_CMP_BIT 0x100

	static bool SA5_ioaccel_mode1_intr_pending(struct ctlr_info *h)
	{
	unsigned long register_value = readl(h->vaddr + SA5_INTR_STATUS);

	return (register_value & SA5_IOACCEL_MODE1_INTR_STATUS_CMP_BIT) ?
	true : false;
	}

	/*
	* Returns true if an interrupt is pending..
	*/
	static bool SA5B_intr_pending(struct ctlr_info *h)
	{
	return readl(h->vaddr + SA5_INTR_STATUS) & SA5B_INTR_PENDING;
	}

	#define IOACCEL_MODE1_REPLY_QUEUE_INDEX 0x1A0
	#define IOACCEL_MODE1_PRODUCER_INDEX 0x1B8
	#define IOACCEL_MODE1_CONSUMER_INDEX 0x1BC
	#define IOACCEL_MODE1_REPLY_UNUSED 0xFFFFFFFFFFFFFFFFULL

	static unsigned long SA5_ioaccel_mode1_completed(struct ctlr_info *h, u8 q)
	{
	u64 register_value;
	struct reply_queue_buffer *rq = &h->reply_queue[q];

	BUG_ON(q >= h->nreply_queues);

	register_value = rq->head[rq->current_entry];
	if (register_value != IOACCEL_MODE1_REPLY_UNUSED) {
	rq->head[rq->current_entry] = IOACCEL_MODE1_REPLY_UNUSED;
	if (++rq->current_entry == rq->size)
	rq->current_entry = 0;
	/*
	* @todo
	*
	* Don't really need to write the new index after each command,
	* but with current driver design this is easiest.
	*/
	wmb();
	writel((q << 24) \| rq->current_entry, h->vaddr +
	IOACCEL_MODE1_CONSUMER_INDEX);
	atomic_dec(&h->commands_outstanding);
	}
	return (unsigned long) register_value;
	}

	static struct access_method SA5_access = {
	.submit_command = SA5_submit_command,
	.set_intr_mask = SA5_intr_mask,
	.intr_pending = SA5_intr_pending,
	.command_completed = SA5_completed,
	};

	/* Duplicate entry of the above to mark unsupported boards */
	static struct access_method SA5A_access = {
	.submit_command = SA5_submit_command,
	.set_intr_mask = SA5_intr_mask,
	.intr_pending = SA5_intr_pending,
	.command_completed = SA5_completed,
	};

	static struct access_method SA5B_access = {
	.submit_command = SA5_submit_command,
	.set_intr_mask = SA5B_intr_mask,
	.intr_pending = SA5B_intr_pending,
	.command_completed = SA5_completed,
	};

	static struct access_method SA5_ioaccel_mode1_access = {
	.submit_command = SA5_submit_command,
	.set_intr_mask = SA5_performant_intr_mask,
	.intr_pending = SA5_ioaccel_mode1_intr_pending,
	.command_completed = SA5_ioaccel_mode1_completed,
	};

	static struct access_method SA5_ioaccel_mode2_access = {
	.submit_command = SA5_submit_command_ioaccel2,
	.set_intr_mask = SA5_performant_intr_mask,
	.intr_pending = SA5_performant_intr_pending,
	.command_completed = SA5_performant_completed,
	};

	static struct access_method SA5_performant_access = {
	.submit_command = SA5_submit_command,
	.set_intr_mask = SA5_performant_intr_mask,
	.intr_pending = SA5_performant_intr_pending,
	.command_completed = SA5_performant_completed,
	};

	static struct access_method SA5_performant_access_no_read = {
	.submit_command = SA5_submit_command_no_read,
	.set_intr_mask = SA5_performant_intr_mask,
	.intr_pending = SA5_performant_intr_pending,
	.command_completed = SA5_performant_completed,
	};

	struct board_type {
	u32 board_id;
	char *product_name;
	struct access_method *access;
	};

	#endif /* HPSA_H */