/*
   * pmcraid.h -- PMC Sierra MaxRAID controller driver header file
   *
   * Written By: Anil Ravindranath<anil_ravindranath@pmc-sierra.com>
   *             PMC-Sierra Inc
   *
   * Copyright (C) 2008, 2009 PMC Sierra Inc.
   *
   * 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 _PMCRAID_H
  #define _PMCRAID_H
  
  #include <linux/types.h>
  #include <linux/completion.h>
  #include <linux/list.h>
  #include <scsi/scsi.h>
  #include <scsi/scsi_cmnd.h>
  #include <linux/cdev.h>
  #include <net/netlink.h>
  #include <net/genetlink.h>
  #include <linux/connector.h>
  /*
   * Driver name   : string representing the driver name
   * Device file   : /dev file to be used for management interfaces
   * Driver version: version string in major_version.minor_version.patch format
   * Driver date   : date information in "Mon dd yyyy" format
   */
  #define PMCRAID_DRIVER_NAME		"PMC MaxRAID"
  #define PMCRAID_DEVFILE			"pmcsas"
  #define PMCRAID_DRIVER_VERSION		"1.0.3"
  
  #define PMCRAID_FW_VERSION_1		0x002
  
  /* Maximum number of adapters supported by current version of the driver */
  #define PMCRAID_MAX_ADAPTERS		1024
  
  /* Bit definitions as per firmware, bit position [0][1][2].....[31] */
  #define PMC_BIT8(n)          (1 << (7-n))
  #define PMC_BIT16(n)         (1 << (15-n))
  #define PMC_BIT32(n)         (1 << (31-n))
  
  /* PMC PCI vendor ID and device ID values */
  #define PCI_VENDOR_ID_PMC			0x11F8
  #define PCI_DEVICE_ID_PMC_MAXRAID		0x5220
  
  /*
   * MAX_CMD          : maximum commands that can be outstanding with IOA
   * MAX_IO_CMD       : command blocks available for IO commands
   * MAX_HCAM_CMD     : command blocks avaibale for HCAMS
   * MAX_INTERNAL_CMD : command blocks avaible for internal commands like reset
   */
  #define PMCRAID_MAX_CMD				1024
  #define PMCRAID_MAX_IO_CMD			1020
  #define PMCRAID_MAX_HCAM_CMD			2
  #define PMCRAID_MAX_INTERNAL_CMD		2
  
  /* MAX_IOADLS       : max number of scatter-gather lists supported by IOA
   * IOADLS_INTERNAL  : number of ioadls included as part of IOARCB.
   * IOADLS_EXTERNAL  : number of ioadls allocated external to IOARCB
   */
  #define PMCRAID_IOADLS_INTERNAL			 27
  #define PMCRAID_IOADLS_EXTERNAL			 37
  #define PMCRAID_MAX_IOADLS			 PMCRAID_IOADLS_INTERNAL
  
  /* HRRQ_ENTRY_SIZE  : size of hrrq buffer
   * IOARCB_ALIGNMENT : alignment required for IOARCB
   * IOADL_ALIGNMENT  : alignment requirement for IOADLs
   * MSIX_VECTORS     : number of MSIX vectors supported
   */
  #define HRRQ_ENTRY_SIZE                          sizeof(__le32)
  #define PMCRAID_IOARCB_ALIGNMENT                 32
  #define PMCRAID_IOADL_ALIGNMENT                  16
  #define PMCRAID_IOASA_ALIGNMENT                  4
  #define PMCRAID_NUM_MSIX_VECTORS                 16
  
  /* various other limits */
  #define PMCRAID_VENDOR_ID_LEN			8
  #define PMCRAID_PRODUCT_ID_LEN			16
  #define PMCRAID_SERIAL_NUM_LEN			8
  #define PMCRAID_LUN_LEN				8
  #define PMCRAID_MAX_CDB_LEN			16
  #define PMCRAID_DEVICE_ID_LEN			8
  #define PMCRAID_SENSE_DATA_LEN			256
  #define PMCRAID_ADD_CMD_PARAM_LEN		48
  
  #define PMCRAID_MAX_BUS_TO_SCAN                  1
  #define PMCRAID_MAX_NUM_TARGETS_PER_BUS          256
  #define PMCRAID_MAX_NUM_LUNS_PER_TARGET          8
  
  /* IOA bus/target/lun number of IOA resources */
  #define PMCRAID_IOA_BUS_ID                       0xfe
  #define PMCRAID_IOA_TARGET_ID                    0xff
  #define PMCRAID_IOA_LUN_ID                       0xff
  #define PMCRAID_VSET_BUS_ID                      0x1
  #define PMCRAID_VSET_LUN_ID                      0x0
  #define PMCRAID_PHYS_BUS_ID                      0x0
  #define PMCRAID_VIRTUAL_ENCL_BUS_ID              0x8
  #define PMCRAID_MAX_VSET_TARGETS                 0x7F
  #define PMCRAID_MAX_VSET_LUNS_PER_TARGET         8
  
  #define PMCRAID_IOA_MAX_SECTORS                  32767
  #define PMCRAID_VSET_MAX_SECTORS                 512
  #define PMCRAID_MAX_CMD_PER_LUN                  254
  
  /* Number of configuration table entries (resources), includes 1 FP,
   * 1 Enclosure device
   */
  #define PMCRAID_MAX_RESOURCES                    256
  
  /* Adapter Commands used by driver */
  #define PMCRAID_QUERY_RESOURCE_STATE             0xC2
  #define PMCRAID_RESET_DEVICE                     0xC3
  /* options to select reset target */
  #define ENABLE_RESET_MODIFIER                    0x80
  #define RESET_DEVICE_LUN                         0x40
  #define RESET_DEVICE_TARGET                      0x20
  #define RESET_DEVICE_BUS                         0x10
  
  #define PMCRAID_IDENTIFY_HRRQ                    0xC4
  #define PMCRAID_QUERY_IOA_CONFIG                 0xC5
  #define PMCRAID_QUERY_CMD_STATUS		 0xCB
  #define PMCRAID_ABORT_CMD                        0xC7
  
  /* CANCEL ALL command, provides option for setting SYNC_COMPLETE
   * on the target resources for which commands got cancelled
   */
  #define PMCRAID_CANCEL_ALL_REQUESTS		 0xCE
  #define PMCRAID_SYNC_COMPLETE_AFTER_CANCEL       PMC_BIT8(0)
  
  /* HCAM command and types of HCAM supported by IOA */
  #define PMCRAID_HOST_CONTROLLED_ASYNC            0xCF
  #define PMCRAID_HCAM_CODE_CONFIG_CHANGE          0x01
  #define PMCRAID_HCAM_CODE_LOG_DATA               0x02
  
  /* IOA shutdown command and various shutdown types */
  #define PMCRAID_IOA_SHUTDOWN                     0xF7
  #define PMCRAID_SHUTDOWN_NORMAL                  0x00
  #define PMCRAID_SHUTDOWN_PREPARE_FOR_NORMAL      0x40
  #define PMCRAID_SHUTDOWN_NONE                    0x100
  #define PMCRAID_SHUTDOWN_ABBREV                  0x80
  
  /* SET SUPPORTED DEVICES command and the option to select all the
   * devices to be supported
   */
  #define PMCRAID_SET_SUPPORTED_DEVICES            0xFB
  #define ALL_DEVICES_SUPPORTED                    PMC_BIT8(0)
  
  /* This option is used with SCSI WRITE_BUFFER command */
  #define PMCRAID_WR_BUF_DOWNLOAD_AND_SAVE         0x05
  
  /* IOASC Codes used by driver */
  #define PMCRAID_IOASC_SENSE_MASK                 0xFFFFFF00
  #define PMCRAID_IOASC_SENSE_KEY(ioasc)           ((ioasc) >> 24)
  #define PMCRAID_IOASC_SENSE_CODE(ioasc)          (((ioasc) & 0x00ff0000) >> 16)
  #define PMCRAID_IOASC_SENSE_QUAL(ioasc)          (((ioasc) & 0x0000ff00) >> 8)
  #define PMCRAID_IOASC_SENSE_STATUS(ioasc)        ((ioasc) & 0x000000ff)
  
  #define PMCRAID_IOASC_GOOD_COMPLETION			0x00000000
  #define PMCRAID_IOASC_GC_IOARCB_NOTFOUND		0x005A0000
  #define PMCRAID_IOASC_NR_INIT_CMD_REQUIRED		0x02040200
  #define PMCRAID_IOASC_NR_IOA_RESET_REQUIRED		0x02048000
  #define PMCRAID_IOASC_NR_SYNC_REQUIRED			0x023F0000
  #define PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC		0x03110C00
  #define PMCRAID_IOASC_HW_CANNOT_COMMUNICATE		0x04050000
  #define PMCRAID_IOASC_HW_DEVICE_TIMEOUT			0x04080100
  #define PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR	0x04448500
  #define PMCRAID_IOASC_HW_IOA_RESET_REQUIRED		0x04448600
  #define PMCRAID_IOASC_IR_INVALID_RESOURCE_HANDLE        0x05250000
  #define PMCRAID_IOASC_AC_TERMINATED_BY_HOST		0x0B5A0000
  #define PMCRAID_IOASC_UA_BUS_WAS_RESET			0x06290000
  #define PMCRAID_IOASC_TIME_STAMP_OUT_OF_SYNC		0x06908B00
  #define PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER		0x06298000
  
  /* Driver defined IOASCs */
  #define PMCRAID_IOASC_IOA_WAS_RESET			0x10000001
  #define PMCRAID_IOASC_PCI_ACCESS_ERROR			0x10000002
  
  /* Various timeout values (in milliseconds) used. If any of these are chip
   * specific, move them to pmcraid_chip_details structure.
   */
  #define PMCRAID_PCI_DEASSERT_TIMEOUT		2000
  #define PMCRAID_BIST_TIMEOUT			2000
  #define PMCRAID_AENWAIT_TIMEOUT			5000
  #define PMCRAID_TRANSOP_TIMEOUT			60000
  
  #define PMCRAID_RESET_TIMEOUT			(2 * HZ)
  #define PMCRAID_CHECK_FOR_RESET_TIMEOUT		((HZ / 10))
  #define PMCRAID_VSET_IO_TIMEOUT			(60 * HZ)
  #define PMCRAID_INTERNAL_TIMEOUT		(60 * HZ)
  #define PMCRAID_SHUTDOWN_TIMEOUT		(150 * HZ)
  #define PMCRAID_RESET_BUS_TIMEOUT		(60 * HZ)
  #define PMCRAID_RESET_HOST_TIMEOUT		(150 * HZ)
  #define PMCRAID_REQUEST_SENSE_TIMEOUT		(30 * HZ)
  #define PMCRAID_SET_SUP_DEV_TIMEOUT		(2 * 60 * HZ)
  
  /* structure to represent a scatter-gather element (IOADL descriptor) */
  struct pmcraid_ioadl_desc {
  	__le64 address;
  	__le32 data_len;
  	__u8  reserved[3];
  	__u8  flags;
  } __attribute__((packed, aligned(PMCRAID_IOADL_ALIGNMENT)));
  
  /* pmcraid_ioadl_desc.flags values */
  #define IOADL_FLAGS_CHAINED      PMC_BIT8(0)
  #define IOADL_FLAGS_LAST_DESC    PMC_BIT8(1)
  #define IOADL_FLAGS_READ_LAST    PMC_BIT8(1)
  #define IOADL_FLAGS_WRITE_LAST   PMC_BIT8(1)
  
  
  /* additional IOARCB data which can be CDB or additional request parameters
   * or list of IOADLs. Firmware supports max of 512 bytes for IOARCB, hence then
   * number of IOADLs are limted to 27. In case they are more than 27, they will
   * be used in chained form
   */
  struct pmcraid_ioarcb_add_data {
  	union {
  		struct pmcraid_ioadl_desc ioadl[PMCRAID_IOADLS_INTERNAL];
  		__u8 add_cmd_params[PMCRAID_ADD_CMD_PARAM_LEN];
  	} u;
  };
  
  /*
   * IOA Request Control Block
   */
  struct pmcraid_ioarcb {
  	__le64 ioarcb_bus_addr;
  	__le32 resource_handle;
  	__le32 response_handle;
  	__le64 ioadl_bus_addr;
  	__le32 ioadl_length;
  	__le32 data_transfer_length;
  	__le64 ioasa_bus_addr;
  	__le16 ioasa_len;
  	__le16 cmd_timeout;
  	__le16 add_cmd_param_offset;
  	__le16 add_cmd_param_length;
  	__le32 reserved1[2];
  	__le32 reserved2;
  	__u8  request_type;
  	__u8  request_flags0;
  	__u8  request_flags1;
  	__u8  hrrq_id;
  	__u8  cdb[PMCRAID_MAX_CDB_LEN];
  	struct pmcraid_ioarcb_add_data add_data;
  } __attribute__((packed, aligned(PMCRAID_IOARCB_ALIGNMENT)));
  
  /* well known resource handle values */
  #define PMCRAID_IOA_RES_HANDLE        0xffffffff
  #define PMCRAID_INVALID_RES_HANDLE    0
  
  /* pmcraid_ioarcb.request_type values */
  #define REQ_TYPE_SCSI                 0x00
  #define REQ_TYPE_IOACMD               0x01
  #define REQ_TYPE_HCAM                 0x02
  
  /* pmcraid_ioarcb.flags0 values */
  #define TRANSFER_DIR_WRITE            PMC_BIT8(0)
  #define INHIBIT_UL_CHECK              PMC_BIT8(2)
  #define SYNC_OVERRIDE                 PMC_BIT8(3)
  #define SYNC_COMPLETE                 PMC_BIT8(4)
  #define NO_LINK_DESCS                 PMC_BIT8(5)
  
  /* pmcraid_ioarcb.flags1 values */
  #define DELAY_AFTER_RESET             PMC_BIT8(0)
  #define TASK_TAG_SIMPLE               0x10
  #define TASK_TAG_ORDERED              0x20
  #define TASK_TAG_QUEUE_HEAD           0x30
  
  /* toggle bit offset in response handle */
  #define HRRQ_TOGGLE_BIT               0x01
  #define HRRQ_RESPONSE_BIT             0x02
  
  /* IOA Status Area */
  struct pmcraid_ioasa_vset {
  	__le32 failing_lba_hi;
  	__le32 failing_lba_lo;
  	__le32 reserved;
  } __attribute__((packed, aligned(4)));
  
  struct pmcraid_ioasa {
  	__le32 ioasc;
  	__le16 returned_status_length;
  	__le16 available_status_length;
  	__le32 residual_data_length;
  	__le32 ilid;
  	__le32 fd_ioasc;
  	__le32 fd_res_address;
  	__le32 fd_res_handle;
  	__le32 reserved;
  
  	/* resource specific sense information */
  	union {
  		struct pmcraid_ioasa_vset vset;
  	} u;
  
  	/* IOA autosense data */
  	__le16 auto_sense_length;
  	__le16 error_data_length;
  	__u8  sense_data[PMCRAID_SENSE_DATA_LEN];
  } __attribute__((packed, aligned(4)));
  
  #define PMCRAID_DRIVER_ILID           0xffffffff
  
  /* Config Table Entry per Resource */
  struct pmcraid_config_table_entry {
  	__u8  resource_type;
  	__u8  bus_protocol;
  	__le16 array_id;
  	__u8  common_flags0;
  	__u8  common_flags1;
  	__u8  unique_flags0;
  	__u8  unique_flags1;	/*also used as vset target_id */
  	__le32 resource_handle;
  	__le32 resource_address;
  	__u8  device_id[PMCRAID_DEVICE_ID_LEN];
  	__u8  lun[PMCRAID_LUN_LEN];
  } __attribute__((packed, aligned(4)));
  
  /* extended configuration table sizes are also of 32 bytes in size */
  struct pmcraid_config_table_entry_ext {
  	struct pmcraid_config_table_entry cfgte;
  };
  
  /* resource types (config_table_entry.resource_type values) */
  #define RES_TYPE_AF_DASD     0x00
  #define RES_TYPE_GSCSI       0x01
  #define RES_TYPE_VSET        0x02
  #define RES_TYPE_IOA_FP      0xFF
  
  #define RES_IS_IOA(res)      ((res).resource_type == RES_TYPE_IOA_FP)
  #define RES_IS_GSCSI(res)    ((res).resource_type == RES_TYPE_GSCSI)
  #define RES_IS_VSET(res)     ((res).resource_type == RES_TYPE_VSET)
  #define RES_IS_AFDASD(res)   ((res).resource_type == RES_TYPE_AF_DASD)
  
  /* bus_protocol values used by driver */
  #define RES_TYPE_VENCLOSURE  0x8
  
  /* config_table_entry.common_flags0 */
  #define MULTIPATH_RESOURCE   PMC_BIT32(0)
  
  /* unique_flags1 */
  #define IMPORT_MODE_MANUAL   PMC_BIT8(0)
  
  /* well known resource handle values */
  #define RES_HANDLE_IOA       0xFFFFFFFF
  #define RES_HANDLE_NONE      0x00000000
  
  /* well known resource address values */
  #define RES_ADDRESS_IOAFP    0xFEFFFFFF
  #define RES_ADDRESS_INVALID  0xFFFFFFFF
  
  /* BUS/TARGET/LUN values from resource_addrr */
  #define RES_BUS(res_addr)    (le32_to_cpu(res_addr) & 0xFF)
  #define RES_TARGET(res_addr) ((le32_to_cpu(res_addr) >> 16) & 0xFF)
  #define RES_LUN(res_addr)    0x0
  
  /* configuration table structure */
  struct pmcraid_config_table {
  	__le16 num_entries;
  	__u8  table_format;
  	__u8  reserved1;
  	__u8  flags;
  	__u8  reserved2[11];
  	union {
  		struct pmcraid_config_table_entry
  				entries[PMCRAID_MAX_RESOURCES];
  		struct pmcraid_config_table_entry_ext
  				entries_ext[PMCRAID_MAX_RESOURCES];
  	};
  } __attribute__((packed, aligned(4)));
  
  /* config_table.flags value */
  #define MICROCODE_UPDATE_REQUIRED		PMC_BIT32(0)
  
  /*
   * HCAM format
   */
  #define PMCRAID_HOSTRCB_LDNSIZE			4056
  
  /* Error log notification format */
  struct pmcraid_hostrcb_error {
  	__le32 fd_ioasc;
  	__le32 fd_ra;
  	__le32 fd_rh;
  	__le32 prc;
  	union {
  		__u8 data[PMCRAID_HOSTRCB_LDNSIZE];
  	} u;
  } __attribute__ ((packed, aligned(4)));
  
  struct pmcraid_hcam_hdr {
  	__u8  op_code;
  	__u8  notification_type;
  	__u8  notification_lost;
  	__u8  flags;
  	__u8  overlay_id;
  	__u8  reserved1[3];
  	__le32 ilid;
  	__le32 timestamp1;
  	__le32 timestamp2;
  	__le32 data_len;
  } __attribute__((packed, aligned(4)));
  
  #define PMCRAID_AEN_GROUP	0x3
  
  struct pmcraid_hcam_ccn {
  	struct pmcraid_hcam_hdr header;
  	struct pmcraid_config_table_entry cfg_entry;
  	struct pmcraid_config_table_entry cfg_entry_old;
  } __attribute__((packed, aligned(4)));
  
  #define PMCRAID_CCN_EXT_SIZE	3944
  struct pmcraid_hcam_ccn_ext {
  	struct pmcraid_hcam_hdr header;
  	struct pmcraid_config_table_entry_ext cfg_entry;
  	struct pmcraid_config_table_entry_ext cfg_entry_old;
  	__u8   reserved[PMCRAID_CCN_EXT_SIZE];
  } __attribute__((packed, aligned(4)));
  
  struct pmcraid_hcam_ldn {
  	struct pmcraid_hcam_hdr header;
  	struct pmcraid_hostrcb_error error_log;
  } __attribute__((packed, aligned(4)));
  
  /* pmcraid_hcam.op_code values */
  #define HOSTRCB_TYPE_CCN			0xE1
  #define HOSTRCB_TYPE_LDN			0xE2
  
  /* pmcraid_hcam.notification_type values */
  #define NOTIFICATION_TYPE_ENTRY_CHANGED		0x0
  #define NOTIFICATION_TYPE_ENTRY_NEW		0x1
  #define NOTIFICATION_TYPE_ENTRY_DELETED		0x2
  #define NOTIFICATION_TYPE_STATE_CHANGE		0x3
  #define NOTIFICATION_TYPE_ENTRY_STATECHANGED	0x4
  #define NOTIFICATION_TYPE_ERROR_LOG		0x10
  #define NOTIFICATION_TYPE_INFORMATION_LOG	0x11
  
  #define HOSTRCB_NOTIFICATIONS_LOST		PMC_BIT8(0)
  
  /* pmcraid_hcam.flags values */
  #define HOSTRCB_INTERNAL_OP_ERROR		PMC_BIT8(0)
  #define HOSTRCB_ERROR_RESPONSE_SENT		PMC_BIT8(1)
  
  /* pmcraid_hcam.overlay_id values */
  #define HOSTRCB_OVERLAY_ID_08			0x08
  #define HOSTRCB_OVERLAY_ID_09			0x09
  #define HOSTRCB_OVERLAY_ID_11			0x11
  #define HOSTRCB_OVERLAY_ID_12			0x12
  #define HOSTRCB_OVERLAY_ID_13			0x13
  #define HOSTRCB_OVERLAY_ID_14			0x14
  #define HOSTRCB_OVERLAY_ID_16			0x16
  #define HOSTRCB_OVERLAY_ID_17			0x17
  #define HOSTRCB_OVERLAY_ID_20			0x20
  #define HOSTRCB_OVERLAY_ID_FF			0xFF
  
  /* Implementation specific card details */
  struct pmcraid_chip_details {
  	/* hardware register offsets */
  	unsigned long  ioastatus;
  	unsigned long  ioarrin;
  	unsigned long  mailbox;
  	unsigned long  global_intr_mask;
  	unsigned long  ioa_host_intr;
  	unsigned long  ioa_host_msix_intr;
  	unsigned long  ioa_host_intr_clr;
  	unsigned long  ioa_host_mask;
  	unsigned long  ioa_host_mask_clr;
  	unsigned long  host_ioa_intr;
  	unsigned long  host_ioa_intr_clr;
  
  	/* timeout used during transitional to operational state */
  	unsigned long transop_timeout;
  };
  
  /* IOA to HOST doorbells (interrupts) */
  #define INTRS_TRANSITION_TO_OPERATIONAL		PMC_BIT32(0)
  #define INTRS_IOARCB_TRANSFER_FAILED		PMC_BIT32(3)
  #define INTRS_IOA_UNIT_CHECK			PMC_BIT32(4)
  #define INTRS_NO_HRRQ_FOR_CMD_RESPONSE		PMC_BIT32(5)
  #define INTRS_CRITICAL_OP_IN_PROGRESS		PMC_BIT32(6)
  #define INTRS_IO_DEBUG_ACK			PMC_BIT32(7)
  #define INTRS_IOARRIN_LOST			PMC_BIT32(27)
  #define INTRS_SYSTEM_BUS_MMIO_ERROR		PMC_BIT32(28)
  #define INTRS_IOA_PROCESSOR_ERROR		PMC_BIT32(29)
  #define INTRS_HRRQ_VALID			PMC_BIT32(30)
  #define INTRS_OPERATIONAL_STATUS		PMC_BIT32(0)
  #define INTRS_ALLOW_MSIX_VECTOR0		PMC_BIT32(31)
  
  /* Host to IOA Doorbells */
  #define DOORBELL_RUNTIME_RESET			PMC_BIT32(1)
  #define DOORBELL_IOA_RESET_ALERT		PMC_BIT32(7)
  #define DOORBELL_IOA_DEBUG_ALERT		PMC_BIT32(9)
  #define DOORBELL_ENABLE_DESTRUCTIVE_DIAGS	PMC_BIT32(8)
  #define DOORBELL_IOA_START_BIST			PMC_BIT32(23)
  #define DOORBELL_INTR_MODE_MSIX			PMC_BIT32(25)
  #define DOORBELL_INTR_MSIX_CLR			PMC_BIT32(26)
  #define DOORBELL_RESET_IOA			PMC_BIT32(31)
  
  /* Global interrupt mask register value */
  #define GLOBAL_INTERRUPT_MASK			0x5ULL
  
  #define PMCRAID_ERROR_INTERRUPTS	(INTRS_IOARCB_TRANSFER_FAILED | \
  					 INTRS_IOA_UNIT_CHECK | \
  					 INTRS_NO_HRRQ_FOR_CMD_RESPONSE | \
  					 INTRS_IOARRIN_LOST | \
  					 INTRS_SYSTEM_BUS_MMIO_ERROR | \
  					 INTRS_IOA_PROCESSOR_ERROR)
  
  #define PMCRAID_PCI_INTERRUPTS		(PMCRAID_ERROR_INTERRUPTS | \
  					 INTRS_HRRQ_VALID | \
  					 INTRS_TRANSITION_TO_OPERATIONAL |\
  					 INTRS_ALLOW_MSIX_VECTOR0)
  
  /* control_block, associated with each of the commands contains IOARCB, IOADLs
   * memory for IOASA. Additional 3 * 16 bytes are allocated in order to support
   * additional request parameters (of max size 48) any command.
   */
  struct pmcraid_control_block {
  	struct pmcraid_ioarcb ioarcb;
  	struct pmcraid_ioadl_desc ioadl[PMCRAID_IOADLS_EXTERNAL + 3];
  	struct pmcraid_ioasa ioasa;
  } __attribute__ ((packed, aligned(PMCRAID_IOARCB_ALIGNMENT)));
  
  /* pmcraid_sglist - Scatter-gather list allocated for passthrough ioctls
   */
  struct pmcraid_sglist {
  	u32 order;
  	u32 num_sg;
  	u32 num_dma_sg;
  	u32 buffer_len;
  	struct scatterlist scatterlist[1];
  };
  
  /* page D0 inquiry data of focal point resource */
  struct pmcraid_inquiry_data {
  	__u8	ph_dev_type;
  	__u8	page_code;
  	__u8	reserved1;
  	__u8	add_page_len;
  	__u8	length;
  	__u8	reserved2;
  	__le16	fw_version;
  	__u8	reserved3[16];
  };
  
  #define PMCRAID_TIMESTAMP_LEN		12
  #define PMCRAID_REQ_TM_STR_LEN		6
  #define PMCRAID_SCSI_SET_TIMESTAMP	0xA4
  #define PMCRAID_SCSI_SERVICE_ACTION	0x0F
  
  struct pmcraid_timestamp_data {
  	__u8 reserved1[4];
  	__u8 timestamp[PMCRAID_REQ_TM_STR_LEN];		/* current time value */
  	__u8 reserved2[2];
  };
  
  /* pmcraid_cmd - LLD representation of SCSI command */
  struct pmcraid_cmd {
  
  	/* Ptr and bus address of DMA.able control block for this command */
  	struct pmcraid_control_block *ioa_cb;
  	dma_addr_t ioa_cb_bus_addr;
  	dma_addr_t dma_handle;
  
  	/* pointer to mid layer structure of SCSI commands */
  	struct scsi_cmnd *scsi_cmd;
  
  	struct list_head free_list;
  	struct completion wait_for_completion;
  	struct timer_list timer;	/* needed for internal commands */
  	u32 timeout;			/* current timeout value */
  	u32 index;			/* index into the command list */
  	u8 completion_req;		/* for handling internal commands */
  	u8 release;			/* for handling completions */
  
  	void (*cmd_done) (struct pmcraid_cmd *);
  	struct pmcraid_instance *drv_inst;
  
  	struct pmcraid_sglist *sglist; /* used for passthrough IOCTLs */
  
  	/* scratch used */
  	union {
  		/* during reset sequence */
  		unsigned long time_left;
  		struct pmcraid_resource_entry *res;
  		int hrrq_index;
  
  		/* used during IO command error handling. Sense buffer
  		 * for REQUEST SENSE command if firmware is not sending
  		 * auto sense data
  		 */
  		struct  {
  			u8 *sense_buffer;
  			dma_addr_t sense_buffer_dma;
  		};
  	};
  };
  
  /*
   * Interrupt registers of IOA
   */
  struct pmcraid_interrupts {
  	void __iomem *ioa_host_interrupt_reg;
  	void __iomem *ioa_host_msix_interrupt_reg;
  	void __iomem *ioa_host_interrupt_clr_reg;
  	void __iomem *ioa_host_interrupt_mask_reg;
  	void __iomem *ioa_host_interrupt_mask_clr_reg;
  	void __iomem *global_interrupt_mask_reg;
  	void __iomem *host_ioa_interrupt_reg;
  	void __iomem *host_ioa_interrupt_clr_reg;
  };
  
  /* ISR parameters LLD allocates (one for each MSI-X if enabled) vectors */
  struct pmcraid_isr_param {
  	struct pmcraid_instance *drv_inst;
  	u16 vector;			/* allocated msi-x vector */
  	u8 hrrq_id;			/* hrrq entry index */
  };
  
  
  /* AEN message header sent as part of event data to applications */
  struct pmcraid_aen_msg {
  	u32 hostno;
  	u32 length;
  	u8  reserved[8];
  	u8  data[0];
  };
  
  /* Controller state event message type */
  struct pmcraid_state_msg {
  	struct pmcraid_aen_msg msg;
  	u32 ioa_state;
  };
  
  #define PMC_DEVICE_EVENT_RESET_START		0x11000000
  #define PMC_DEVICE_EVENT_RESET_SUCCESS		0x11000001
  #define PMC_DEVICE_EVENT_RESET_FAILED		0x11000002
  #define PMC_DEVICE_EVENT_SHUTDOWN_START		0x11000003
  #define PMC_DEVICE_EVENT_SHUTDOWN_SUCCESS	0x11000004
  #define PMC_DEVICE_EVENT_SHUTDOWN_FAILED	0x11000005
  
  struct pmcraid_hostrcb {
  	struct pmcraid_instance *drv_inst;
  	struct pmcraid_aen_msg *msg;
  	struct pmcraid_hcam_hdr *hcam;	/* pointer to hcam buffer */
  	struct pmcraid_cmd  *cmd;       /* pointer to command block used */
  	dma_addr_t baddr;		/* system address of hcam buffer */
  	atomic_t ignore;		/* process HCAM response ? */
  };
  
  #define PMCRAID_AEN_HDR_SIZE	sizeof(struct pmcraid_aen_msg)
  
  
  
  /*
   * Per adapter structure maintained by LLD
   */
  struct pmcraid_instance {
  	/* Array of allowed-to-be-exposed resources, initialized from
  	 * Configutation Table, later updated with CCNs
  	 */
  	struct pmcraid_resource_entry *res_entries;
  
  	struct list_head free_res_q;	/* res_entries lists for easy lookup */
  	struct list_head used_res_q;	/* List of to be exposed resources */
  	spinlock_t resource_lock;	/* spinlock to protect resource list */
  
  	void __iomem *mapped_dma_addr;
  	void __iomem *ioa_status;	/* Iomapped IOA status register */
  	void __iomem *mailbox;		/* Iomapped mailbox register */
  	void __iomem *ioarrin;		/* IOmapped IOARR IN register */
  
  	struct pmcraid_interrupts int_regs;
  	struct pmcraid_chip_details *chip_cfg;
  
  	/* HostRCBs needed for HCAM */
  	struct pmcraid_hostrcb ldn;
  	struct pmcraid_hostrcb ccn;
  	struct pmcraid_state_msg scn;	/* controller state change msg */
  
  
  	/* Bus address of start of HRRQ */
  	dma_addr_t hrrq_start_bus_addr[PMCRAID_NUM_MSIX_VECTORS];
  
  	/* Pointer to 1st entry of HRRQ */
  	__be32 *hrrq_start[PMCRAID_NUM_MSIX_VECTORS];
  
  	/* Pointer to last entry of HRRQ */
  	__be32 *hrrq_end[PMCRAID_NUM_MSIX_VECTORS];
  
  	/* Pointer to current pointer of hrrq */
  	__be32 *hrrq_curr[PMCRAID_NUM_MSIX_VECTORS];
  
  	/* Lock for HRRQ access */
  	spinlock_t hrrq_lock[PMCRAID_NUM_MSIX_VECTORS];
  
  	struct pmcraid_inquiry_data *inq_data;
  	dma_addr_t  inq_data_baddr;
  
  	struct pmcraid_timestamp_data *timestamp_data;
  	dma_addr_t  timestamp_data_baddr;
  
  	/* size of configuration table entry, varies based on the firmware */
  	u32	config_table_entry_size;
  
  	/* Expected toggle bit at host */
  	u8 host_toggle_bit[PMCRAID_NUM_MSIX_VECTORS];
  
  
  	/* Wait Q for  threads to wait for Reset IOA completion */
  	wait_queue_head_t reset_wait_q;
  	struct pmcraid_cmd *reset_cmd;
  
  	/* structures for supporting SIGIO based AEN. */
  	struct fasync_struct *aen_queue;
  	struct mutex aen_queue_lock;	/* lock for aen subscribers list */
  	struct cdev cdev;
  
  	struct Scsi_Host *host;	/* mid layer interface structure handle */
  	struct pci_dev *pdev;	/* PCI device structure handle */
  
  	/* No of Reset IOA retries . IOA marked dead if threshold exceeds */
  	u8 ioa_reset_attempts;
  #define PMCRAID_RESET_ATTEMPTS 3
  
  	u8  current_log_level;	/* default level for logging IOASC errors */
  
  	u8  num_hrrq;		/* Number of interrupt vectors allocated */
  	u8  interrupt_mode;	/* current interrupt mode legacy or msix */
  	dev_t dev;		/* Major-Minor numbers for Char device */
  
  	/* Used as ISR handler argument */
  	struct pmcraid_isr_param hrrq_vector[PMCRAID_NUM_MSIX_VECTORS];
  
  	/* Message id as filled in last fired IOARCB, used to identify HRRQ */
  	atomic_t last_message_id;
  
  	/* configuration table */
  	struct pmcraid_config_table *cfg_table;
  	dma_addr_t cfg_table_bus_addr;
  
  	/* structures related to command blocks */
  	struct kmem_cache *cmd_cachep;		/* cache for cmd blocks */
  	struct pci_pool *control_pool;		/* pool for control blocks */
  	char   cmd_pool_name[64];		/* name of cmd cache */
  	char   ctl_pool_name[64];		/* name of control cache */
  
  	struct pmcraid_cmd *cmd_list[PMCRAID_MAX_CMD];
  
  	struct list_head free_cmd_pool;
  	struct list_head pending_cmd_pool;
  	spinlock_t free_pool_lock;		/* free pool lock */
  	spinlock_t pending_pool_lock;		/* pending pool lock */
  
  	/* Tasklet to handle deferred processing */
  	struct tasklet_struct isr_tasklet[PMCRAID_NUM_MSIX_VECTORS];
  
  	/* Work-queue (Shared) for deferred reset processing */
  	struct work_struct worker_q;
  
  	/* No of IO commands pending with FW */
  	atomic_t outstanding_cmds;
  
  	/* should add/delete resources to mid-layer now ?*/
  	atomic_t expose_resources;
  
  
  
  	u32 ioa_state:4;	/* For IOA Reset sequence FSM */
  #define IOA_STATE_OPERATIONAL       0x0
  #define IOA_STATE_UNKNOWN           0x1
  #define IOA_STATE_DEAD              0x2
  #define IOA_STATE_IN_SOFT_RESET     0x3
  #define IOA_STATE_IN_HARD_RESET     0x4
  #define IOA_STATE_IN_RESET_ALERT    0x5
  #define IOA_STATE_IN_BRINGDOWN      0x6
  #define IOA_STATE_IN_BRINGUP        0x7
  
  	u32 ioa_reset_in_progress:1; /* true if IOA reset is in progress */
  	u32 ioa_hard_reset:1;	/* TRUE if Hard Reset is needed */
  	u32 ioa_unit_check:1;	/* Indicates Unit Check condition */
  	u32 ioa_bringdown:1;	/* whether IOA needs to be brought down */
  	u32 force_ioa_reset:1;  /* force adapter reset ? */
  	u32 reinit_cfg_table:1; /* reinit config table due to lost CCN */
  	u32 ioa_shutdown_type:2;/* shutdown type used during reset */
  #define SHUTDOWN_NONE               0x0
  #define SHUTDOWN_NORMAL             0x1
  #define SHUTDOWN_ABBREV             0x2
  	u32 timestamp_error:1; /* indicate set timestamp for out of sync */
  
  };
  
  /* LLD maintained resource entry structure */
  struct pmcraid_resource_entry {
  	struct list_head queue;	/* link to "to be exposed" resources */
  	union {
  		struct pmcraid_config_table_entry cfg_entry;
  		struct pmcraid_config_table_entry_ext cfg_entry_ext;
  	};
  	struct scsi_device *scsi_dev;	/* Link scsi_device structure */
  	atomic_t read_failures;		/* count of failed READ commands */
  	atomic_t write_failures;	/* count of failed WRITE commands */
  
  	/* To indicate add/delete/modify during CCN */
  	u8 change_detected;
  #define RES_CHANGE_ADD          0x1	/* add this to mid-layer */
  #define RES_CHANGE_DEL          0x2	/* remove this from mid-layer */
  
  	u8 reset_progress;      /* Device is resetting */
  
  	/*
  	 * When IOA asks for sync (i.e. IOASC = Not Ready, Sync Required), this
  	 * flag will be set, mid layer will be asked to retry. In the next
  	 * attempt, this flag will be checked in queuecommand() to set
  	 * SYNC_COMPLETE flag in IOARCB (flag_0).
  	 */
  	u8 sync_reqd;
  
  	/* target indicates the mapped target_id assigned to this resource if
  	 * this is VSET resource. For non-VSET resources this will be un-used
  	 * or zero
  	 */
  	u8 target;
  };
  
  /* Data structures used in IOASC error code logging */
  struct pmcraid_ioasc_error {
  	u32 ioasc_code;		/* IOASC code */
  	u8 log_level;		/* default log level assignment. */
  	char *error_string;
  };
  
  /* Initial log_level assignments for various IOASCs */
  #define IOASC_LOG_LEVEL_NONE	    0x0 /* no logging */
  #define IOASC_LOG_LEVEL_MUST        0x1	/* must log: all high-severity errors */
  #define IOASC_LOG_LEVEL_HARD        0x2	/* optional – low severity errors */
  
  /* Error information maintained by LLD. LLD initializes the pmcraid_error_table
   * statically.
   */
  static struct pmcraid_ioasc_error pmcraid_ioasc_error_table[] = {
  	{0x01180600, IOASC_LOG_LEVEL_HARD,
  	 "Recovered Error, soft media error, sector reassignment suggested"},
  	{0x015D0000, IOASC_LOG_LEVEL_HARD,
  	 "Recovered Error, failure prediction threshold exceeded"},
  	{0x015D9200, IOASC_LOG_LEVEL_HARD,
  	 "Recovered Error, soft Cache Card Battery error threshold"},
  	{0x015D9200, IOASC_LOG_LEVEL_HARD,
  	 "Recovered Error, soft Cache Card Battery error threshold"},
  	{0x02048000, IOASC_LOG_LEVEL_HARD,
  	 "Not Ready, IOA Reset Required"},
  	{0x02408500, IOASC_LOG_LEVEL_HARD,
  	 "Not Ready, IOA microcode download required"},
  	{0x03110B00, IOASC_LOG_LEVEL_HARD,
  	 "Medium Error, data unreadable, reassignment suggested"},
  	{0x03110C00, IOASC_LOG_LEVEL_MUST,
  	 "Medium Error, data unreadable do not reassign"},
  	{0x03310000, IOASC_LOG_LEVEL_HARD,
  	 "Medium Error, media corrupted"},
  	{0x04050000, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, IOA can't communicate with device"},
  	{0x04080000, IOASC_LOG_LEVEL_MUST,
  	 "Hardware Error, device bus error"},
  	{0x04088000, IOASC_LOG_LEVEL_MUST,
  	 "Hardware Error, device bus is not functioning"},
  	{0x04118000, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, IOA reserved area data check"},
  	{0x04118100, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, IOA reserved area invalid data pattern"},
  	{0x04118200, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, IOA reserved area LRC error"},
  	{0x04320000, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, reassignment space exhausted"},
  	{0x04330000, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, data transfer underlength error"},
  	{0x04330000, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, data transfer overlength error"},
  	{0x04418000, IOASC_LOG_LEVEL_MUST,
  	 "Hardware Error, PCI bus error"},
  	{0x04440000, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, device error"},
  	{0x04448200, IOASC_LOG_LEVEL_MUST,
  	 "Hardware Error, IOA error"},
  	{0x04448300, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, undefined device response"},
  	{0x04448400, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, IOA microcode error"},
  	{0x04448600, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, IOA reset required"},
  	{0x04449200, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, hard Cache Fearuee Card Battery error"},
  	{0x0444A000, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, failed device altered"},
  	{0x0444A200, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, data check after reassignment"},
  	{0x0444A300, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, LRC error after reassignment"},
  	{0x044A0000, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, device bus error (msg/cmd phase)"},
  	{0x04670400, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, new device can't be used"},
  	{0x04678000, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, invalid multiadapter configuration"},
  	{0x04678100, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, incorrect connection between enclosures"},
  	{0x04678200, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, connections exceed IOA design limits"},
  	{0x04678300, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, incorrect multipath connection"},
  	{0x04679000, IOASC_LOG_LEVEL_HARD,
  	 "Hardware Error, command to LUN failed"},
  	{0x064C8000, IOASC_LOG_LEVEL_HARD,
  	 "Unit Attention, cache exists for missing/failed device"},
  	{0x06670100, IOASC_LOG_LEVEL_HARD,
  	 "Unit Attention, incompatible exposed mode device"},
  	{0x06670600, IOASC_LOG_LEVEL_HARD,
  	 "Unit Attention, attachment of logical unit failed"},
  	{0x06678000, IOASC_LOG_LEVEL_HARD,
  	 "Unit Attention, cables exceed connective design limit"},
  	{0x06678300, IOASC_LOG_LEVEL_HARD,
  	 "Unit Attention, incomplete multipath connection between" \
  	 "IOA and enclosure"},
  	{0x06678400, IOASC_LOG_LEVEL_HARD,
  	 "Unit Attention, incomplete multipath connection between" \
  	 "device and enclosure"},
  	{0x06678500, IOASC_LOG_LEVEL_HARD,
  	 "Unit Attention, incomplete multipath connection between" \
  	 "IOA and remote IOA"},
  	{0x06678600, IOASC_LOG_LEVEL_HARD,
  	 "Unit Attention, missing remote IOA"},
  	{0x06679100, IOASC_LOG_LEVEL_HARD,
  	 "Unit Attention, enclosure doesn't support required multipath" \
  	 "function"},
  	{0x06698200, IOASC_LOG_LEVEL_HARD,
  	 "Unit Attention, corrupt array parity detected on device"},
  	{0x066B0200, IOASC_LOG_LEVEL_HARD,
  	 "Unit Attention, array exposed"},
  	{0x066B8200, IOASC_LOG_LEVEL_HARD,
  	 "Unit Attention, exposed array is still protected"},
  	{0x066B9200, IOASC_LOG_LEVEL_HARD,
  	 "Unit Attention, Multipath redundancy level got worse"},
  	{0x07270000, IOASC_LOG_LEVEL_HARD,
  	 "Data Protect, device is read/write protected by IOA"},
  	{0x07278000, IOASC_LOG_LEVEL_HARD,
  	 "Data Protect, IOA doesn't support device attribute"},
  	{0x07278100, IOASC_LOG_LEVEL_HARD,
  	 "Data Protect, NVRAM mirroring prohibited"},
  	{0x07278400, IOASC_LOG_LEVEL_HARD,
  	 "Data Protect, array is short 2 or more devices"},
  	{0x07278600, IOASC_LOG_LEVEL_HARD,
  	 "Data Protect, exposed array is short a required device"},
  	{0x07278700, IOASC_LOG_LEVEL_HARD,
  	 "Data Protect, array members not at required addresses"},
  	{0x07278800, IOASC_LOG_LEVEL_HARD,
  	 "Data Protect, exposed mode device resource address conflict"},
  	{0x07278900, IOASC_LOG_LEVEL_HARD,
  	 "Data Protect, incorrect resource address of exposed mode device"},
  	{0x07278A00, IOASC_LOG_LEVEL_HARD,
  	 "Data Protect, Array is missing a device and parity is out of sync"},
  	{0x07278B00, IOASC_LOG_LEVEL_HARD,
  	 "Data Protect, maximum number of arrays already exist"},
  	{0x07278C00, IOASC_LOG_LEVEL_HARD,
  	 "Data Protect, cannot locate cache data for device"},
  	{0x07278D00, IOASC_LOG_LEVEL_HARD,
  	 "Data Protect, cache data exits for a changed device"},
  	{0x07279100, IOASC_LOG_LEVEL_HARD,
  	 "Data Protect, detection of a device requiring format"},
  	{0x07279200, IOASC_LOG_LEVEL_HARD,
  	 "Data Protect, IOA exceeds maximum number of devices"},
  	{0x07279600, IOASC_LOG_LEVEL_HARD,
  	 "Data Protect, missing array, volume set is not functional"},
  	{0x07279700, IOASC_LOG_LEVEL_HARD,
  	 "Data Protect, single device for a volume set"},
  	{0x07279800, IOASC_LOG_LEVEL_HARD,
  	 "Data Protect, missing multiple devices for a volume set"},
  	{0x07279900, IOASC_LOG_LEVEL_HARD,
  	 "Data Protect, maximum number of volument sets already exists"},
  	{0x07279A00, IOASC_LOG_LEVEL_HARD,
  	 "Data Protect, other volume set problem"},
  };
  
  /* macros to help in debugging */
  #define pmcraid_err(...)  \
  	printk(KERN_ERR "MaxRAID: "__VA_ARGS__)
  
  #define pmcraid_info(...) \
  	if (pmcraid_debug_log) \
  		printk(KERN_INFO "MaxRAID: "__VA_ARGS__)
  
  /* check if given command is a SCSI READ or SCSI WRITE command */
  #define SCSI_READ_CMD           0x1	/* any of SCSI READ commands */
  #define SCSI_WRITE_CMD          0x2	/* any of SCSI WRITE commands */
  #define SCSI_CMD_TYPE(opcode) \
  ({  u8 op = opcode; u8 __type = 0;\
  	if (op == READ_6 || op == READ_10 || op == READ_12 || op == READ_16)\
  		__type = SCSI_READ_CMD;\
  	else if (op == WRITE_6 || op == WRITE_10 || op == WRITE_12 || \
  		 op == WRITE_16)\
  		__type = SCSI_WRITE_CMD;\
  	__type;\
  })
  
  #define IS_SCSI_READ_WRITE(opcode) \
  ({	u8 __type = SCSI_CMD_TYPE(opcode); \
  	(__type == SCSI_READ_CMD || __type == SCSI_WRITE_CMD) ? 1 : 0;\
  })
  
  
  /*
   * pmcraid_ioctl_header - definition of header structure that precedes all the
   * buffers given as ioctl arguments.
   *
   * .signature           : always ASCII string, "PMCRAID"
   * .reserved            : not used
   * .buffer_length       : length of the buffer following the header
   */
  struct pmcraid_ioctl_header {
  	u8  signature[8];
  	u32 reserved;
  	u32 buffer_length;
  };
  
  #define PMCRAID_IOCTL_SIGNATURE      "PMCRAID"
  
  /*
   * pmcraid_passthrough_ioctl_buffer - structure given as argument to
   * passthrough(or firmware handled) IOCTL commands. Note that ioarcb requires
   * 32-byte alignment so, it is necessary to pack this structure to avoid any
   * holes between ioctl_header and passthrough buffer
   *
   * .ioactl_header : ioctl header
   * .ioarcb        : filled-up ioarcb buffer, driver always reads this buffer
   * .ioasa         : buffer for ioasa, driver fills this with IOASA from firmware
   * .request_buffer: The I/O buffer (flat), driver reads/writes to this based on
   *                  the transfer directions passed in ioarcb.flags0. Contents
   *                  of this buffer are valid only when ioarcb.data_transfer_len
   *                  is not zero.
   */
  struct pmcraid_passthrough_ioctl_buffer {
  	struct pmcraid_ioctl_header ioctl_header;
  	struct pmcraid_ioarcb ioarcb;
  	struct pmcraid_ioasa  ioasa;
  	u8  request_buffer[1];
  } __attribute__ ((packed));
  
  /*
   * keys to differentiate between driver handled IOCTLs and passthrough
   * IOCTLs passed to IOA. driver determines the ioctl type using macro
   * _IOC_TYPE
   */
  #define PMCRAID_DRIVER_IOCTL         'D'
  #define PMCRAID_PASSTHROUGH_IOCTL    'F'
  
  #define DRV_IOCTL(n, size) \
  	_IOC(_IOC_READ|_IOC_WRITE, PMCRAID_DRIVER_IOCTL, (n), (size))
  
  #define FMW_IOCTL(n, size) \
  	_IOC(_IOC_READ|_IOC_WRITE, PMCRAID_PASSTHROUGH_IOCTL,  (n), (size))
  
  /*
   * _ARGSIZE: macro that gives size of the argument type passed to an IOCTL cmd.
   * This is to facilitate applications avoiding un-necessary memory allocations.
   * For example, most of driver handled ioctls do not require ioarcb, ioasa.
   */
  #define _ARGSIZE(arg) (sizeof(struct pmcraid_ioctl_header) + sizeof(arg))
  
  /* Driver handled IOCTL command definitions */
  
  #define PMCRAID_IOCTL_RESET_ADAPTER          \
  	DRV_IOCTL(5, sizeof(struct pmcraid_ioctl_header))
  
  /* passthrough/firmware handled commands */
  #define PMCRAID_IOCTL_PASSTHROUGH_COMMAND         \
  	FMW_IOCTL(1, sizeof(struct pmcraid_passthrough_ioctl_buffer))
  
  #define PMCRAID_IOCTL_DOWNLOAD_MICROCODE     \
  	FMW_IOCTL(2, sizeof(struct pmcraid_passthrough_ioctl_buffer))
  
  
  #endif /* _PMCRAID_H */