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sbp2.h

/*
 * sbp2.h - Defines and prototypes for sbp2.c
 *
 * Copyright (C) 2000 James Goodwin, Filanet Corporation (www.filanet.com)
 * jamesg@filanet.com
 *
 * 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 SBP2_H
#define SBP2_H

#define SBP2_DEVICE_NAME            "sbp2"

/*
 * SBP-2 specific definitions
 */

#define ORB_DIRECTION_WRITE_TO_MEDIA      0x0
#define ORB_DIRECTION_READ_FROM_MEDIA     0x1
#define ORB_DIRECTION_NO_DATA_TRANSFER    0x2

#define ORB_SET_NULL_PTR(v)         (((v) & 0x1) << 31)
#define ORB_SET_NOTIFY(v)           (((v) & 0x1) << 31)
#define ORB_SET_RQ_FMT(v)           (((v) & 0x3) << 29)
#define ORB_SET_NODE_ID(v)          (((v) & 0xffff) << 16)
#define ORB_SET_STATUS_FIFO_HI(v, id)     ((v) >> 32 | ORB_SET_NODE_ID(id))
#define ORB_SET_STATUS_FIFO_LO(v)   ((v) & 0xffffffff)
#define ORB_SET_DATA_SIZE(v)        ((v) & 0xffff)
#define ORB_SET_PAGE_SIZE(v)        (((v) & 0x7) << 16)
#define ORB_SET_PAGE_TABLE_PRESENT(v)     (((v) & 0x1) << 19)
#define ORB_SET_MAX_PAYLOAD(v)            (((v) & 0xf) << 20)
#define ORB_SET_SPEED(v)            (((v) & 0x7) << 24)
#define ORB_SET_DIRECTION(v)        (((v) & 0x1) << 27)

struct sbp2_command_orb {
      u32 next_ORB_hi;
      u32 next_ORB_lo;
      u32 data_descriptor_hi;
      u32 data_descriptor_lo;
      u32 misc;
      u8 cdb[12];
} __attribute__((packed));

#define SBP2_LOGIN_REQUEST          0x0
#define SBP2_QUERY_LOGINS_REQUEST   0x1
#define SBP2_RECONNECT_REQUEST            0x3
#define SBP2_SET_PASSWORD_REQUEST   0x4
#define SBP2_LOGOUT_REQUEST         0x7
#define SBP2_ABORT_TASK_REQUEST           0xb
#define SBP2_ABORT_TASK_SET         0xc
#define SBP2_LOGICAL_UNIT_RESET           0xe
#define SBP2_TARGET_RESET_REQUEST   0xf

#define ORB_SET_LUN(v)              ((v) & 0xffff)
#define ORB_SET_FUNCTION(v)         (((v) & 0xf) << 16)
#define ORB_SET_RECONNECT(v)        (((v) & 0xf) << 20)
#define ORB_SET_EXCLUSIVE(v)        ((v) ? 1 << 28 : 0)
#define ORB_SET_LOGIN_RESP_LENGTH(v)      ((v) & 0xffff)
#define ORB_SET_PASSWD_LENGTH(v)    (((v) & 0xffff) << 16)

struct sbp2_login_orb {
      u32 password_hi;
      u32 password_lo;
      u32 login_response_hi;
      u32 login_response_lo;
      u32 lun_misc;
      u32 passwd_resp_lengths;
      u32 status_fifo_hi;
      u32 status_fifo_lo;
} __attribute__((packed));

#define RESPONSE_GET_LOGIN_ID(v)    ((v) & 0xffff)
#define RESPONSE_GET_LENGTH(v)            (((v) >> 16) & 0xffff)
#define RESPONSE_GET_RECONNECT_HOLD(v)    ((v) & 0xffff)

struct sbp2_login_response {
      u32 length_login_ID;
      u32 command_block_agent_hi;
      u32 command_block_agent_lo;
      u32 reconnect_hold;
} __attribute__((packed));

#define ORB_SET_LOGIN_ID(v)                 ((v) & 0xffff)
#define ORB_SET_QUERY_LOGINS_RESP_LENGTH(v) ((v) & 0xffff)

struct sbp2_query_logins_orb {
      u32 reserved1;
      u32 reserved2;
      u32 query_response_hi;
      u32 query_response_lo;
      u32 lun_misc;
      u32 reserved_resp_length;
      u32 status_fifo_hi;
      u32 status_fifo_lo;
} __attribute__((packed));

#define RESPONSE_GET_MAX_LOGINS(v)  ((v) & 0xffff)
#define RESPONSE_GET_ACTIVE_LOGINS(v)     ((RESPONSE_GET_LENGTH((v)) - 4) / 12)

struct sbp2_query_logins_response {
      u32 length_max_logins;
      u32 misc_IDs;
      u32 initiator_misc_hi;
      u32 initiator_misc_lo;
} __attribute__((packed));

struct sbp2_reconnect_orb {
      u32 reserved1;
      u32 reserved2;
      u32 reserved3;
      u32 reserved4;
      u32 login_ID_misc;
      u32 reserved5;
      u32 status_fifo_hi;
      u32 status_fifo_lo;
} __attribute__((packed));

struct sbp2_logout_orb {
      u32 reserved1;
      u32 reserved2;
      u32 reserved3;
      u32 reserved4;
      u32 login_ID_misc;
      u32 reserved5;
      u32 status_fifo_hi;
      u32 status_fifo_lo;
} __attribute__((packed));

#define PAGE_TABLE_SET_SEGMENT_BASE_HI(v) ((v) & 0xffff)
#define PAGE_TABLE_SET_SEGMENT_LENGTH(v)  (((v) & 0xffff) << 16)

struct sbp2_unrestricted_page_table {
      u32 length_segment_base_hi;
      u32 segment_base_lo;
} __attribute__((packed));

#define RESP_STATUS_REQUEST_COMPLETE            0x0
#define RESP_STATUS_TRANSPORT_FAILURE           0x1
#define RESP_STATUS_ILLEGAL_REQUEST       0x2
#define RESP_STATUS_VENDOR_DEPENDENT            0x3

#define SBP2_STATUS_NO_ADDITIONAL_INFO          0x0
#define SBP2_STATUS_REQ_TYPE_NOT_SUPPORTED      0x1
#define SBP2_STATUS_SPEED_NOT_SUPPORTED         0x2
#define SBP2_STATUS_PAGE_SIZE_NOT_SUPPORTED     0x3
#define SBP2_STATUS_ACCESS_DENIED         0x4
#define SBP2_STATUS_LU_NOT_SUPPORTED            0x5
#define SBP2_STATUS_MAX_PAYLOAD_TOO_SMALL 0x6
#define SBP2_STATUS_RESOURCES_UNAVAILABLE 0x8
#define SBP2_STATUS_FUNCTION_REJECTED           0x9
#define SBP2_STATUS_LOGIN_ID_NOT_RECOGNIZED     0xa
#define SBP2_STATUS_DUMMY_ORB_COMPLETED         0xb
#define SBP2_STATUS_REQUEST_ABORTED       0xc
#define SBP2_STATUS_UNSPECIFIED_ERROR           0xff

#define SFMT_CURRENT_ERROR                0x0
#define SFMT_DEFERRED_ERROR               0x1
#define SFMT_VENDOR_DEPENDENT_STATUS            0x3

#define STATUS_GET_SRC(v)                 (((v) >> 30) & 0x3)
#define STATUS_GET_RESP(v)                (((v) >> 28) & 0x3)
#define STATUS_GET_LEN(v)                 (((v) >> 24) & 0x7)
#define STATUS_GET_SBP_STATUS(v)          (((v) >> 16) & 0xff)
#define STATUS_GET_ORB_OFFSET_HI(v)       ((v) & 0x0000ffff)
#define STATUS_TEST_DEAD(v)               ((v) & 0x08000000)
/* test 'resp' | 'dead' | 'sbp2_status' */
#define STATUS_TEST_RDS(v)                ((v) & 0x38ff0000)

struct sbp2_status_block {
      u32 ORB_offset_hi_misc;
      u32 ORB_offset_lo;
      u8 command_set_dependent[24];
} __attribute__((packed));


/*
 * SBP2 related configuration ROM definitions
 */

#define SBP2_UNIT_DIRECTORY_OFFSET_KEY          0xd1
#define SBP2_CSR_OFFSET_KEY               0x54
#define SBP2_UNIT_SPEC_ID_KEY             0x12
#define SBP2_UNIT_SW_VERSION_KEY          0x13
#define SBP2_COMMAND_SET_SPEC_ID_KEY            0x38
#define SBP2_COMMAND_SET_KEY              0x39
#define SBP2_UNIT_CHARACTERISTICS_KEY           0x3a
#define SBP2_DEVICE_TYPE_AND_LUN_KEY            0x14
#define SBP2_FIRMWARE_REVISION_KEY        0x3c

#define SBP2_AGENT_STATE_OFFSET                 0x00ULL
#define SBP2_AGENT_RESET_OFFSET                 0x04ULL
#define SBP2_ORB_POINTER_OFFSET                 0x08ULL
#define SBP2_DOORBELL_OFFSET              0x10ULL
#define SBP2_UNSOLICITED_STATUS_ENABLE_OFFSET   0x14ULL
#define SBP2_UNSOLICITED_STATUS_VALUE           0xf

#define SBP2_BUSY_TIMEOUT_ADDRESS         0xfffff0000210ULL
/* biggest possible value for Single Phase Retry count is 0xf */
#define SBP2_BUSY_TIMEOUT_VALUE                 0xf

#define SBP2_AGENT_RESET_DATA             0xf

#define SBP2_UNIT_SPEC_ID_ENTRY                 0x0000609e
#define SBP2_SW_VERSION_ENTRY             0x00010483


/*
 * SCSI specific definitions
 */

#define SBP2_MAX_SG_ELEMENT_LENGTH        0xf000
#define SBP2_MAX_SECTORS                  255
/* There is no real limitation of the queue depth (i.e. length of the linked
 * list of command ORBs) at the target. The chosen depth is merely an
 * implementation detail of the sbp2 driver. */
#define SBP2_MAX_CMDS                     8

#define SBP2_SCSI_STATUS_GOOD             0x0
#define SBP2_SCSI_STATUS_CHECK_CONDITION  0x2
#define SBP2_SCSI_STATUS_CONDITION_MET          0x4
#define SBP2_SCSI_STATUS_BUSY             0x8
#define SBP2_SCSI_STATUS_RESERVATION_CONFLICT   0x18
#define SBP2_SCSI_STATUS_COMMAND_TERMINATED     0x22
#define SBP2_SCSI_STATUS_SELECTION_TIMEOUT      0xff


/*
 * Representations of commands and devices
 */

enum sbp2_dma_types {
      CMD_DMA_NONE,
      CMD_DMA_PAGE,
      CMD_DMA_SINGLE
};

/* Per SCSI command */
struct sbp2_command_info {
      struct list_head list;
      struct sbp2_command_orb command_orb;
      dma_addr_t command_orb_dma;
      struct scsi_cmnd *Current_SCpnt;
      void (*Current_done)(struct scsi_cmnd *);

      /* Also need s/g structure for each sbp2 command */
      struct sbp2_unrestricted_page_table
            scatter_gather_element[SG_ALL] __attribute__((aligned(8)));
      dma_addr_t sge_dma;
      void *sge_buffer;
      dma_addr_t cmd_dma;
      enum sbp2_dma_types dma_type;
      unsigned long dma_size;
      enum dma_data_direction dma_dir;
};

/* Per FireWire host */
struct sbp2_fwhost_info {
      struct hpsb_host *host;
      struct list_head logical_units;
};

/* Per logical unit */
struct sbp2_lu {
      /* Operation request blocks */
      struct sbp2_command_orb *last_orb;
      dma_addr_t last_orb_dma;
      struct sbp2_login_orb *login_orb;
      dma_addr_t login_orb_dma;
      struct sbp2_login_response *login_response;
      dma_addr_t login_response_dma;
      struct sbp2_query_logins_orb *query_logins_orb;
      dma_addr_t query_logins_orb_dma;
      struct sbp2_query_logins_response *query_logins_response;
      dma_addr_t query_logins_response_dma;
      struct sbp2_reconnect_orb *reconnect_orb;
      dma_addr_t reconnect_orb_dma;
      struct sbp2_logout_orb *logout_orb;
      dma_addr_t logout_orb_dma;
      struct sbp2_status_block status_block;

      /* How to talk to the unit */
      u64 management_agent_addr;
      u64 command_block_agent_addr;
      u32 speed_code;
      u32 max_payload_size;
      u16 lun;

      /* Address for the unit to write status blocks to */
      u64 status_fifo_addr;

      /* Waitqueue flag for logins, reconnects, logouts, query logins */
      unsigned int access_complete:1;

      /* Pool of command ORBs for this logical unit */
      spinlock_t cmd_orb_lock;
      struct list_head cmd_orb_inuse;
      struct list_head cmd_orb_completed;

      /* Backlink to FireWire host; list of units attached to the host */
      struct sbp2_fwhost_info *hi;
      struct list_head lu_list;

      /* IEEE 1394 core's device representations */
      struct node_entry *ne;
      struct unit_directory *ud;

      /* SCSI core's device representations */
      struct scsi_device *sdev;
      struct Scsi_Host *shost;

      /* Device specific workarounds/brokeness */
      unsigned workarounds;

      /* Connection state */
      atomic_t state;

      /* For deferred requests to the fetch agent */
      struct work_struct protocol_work;
};

/* For use in sbp2_lu.state */
enum sbp2lu_state_types {
      SBP2LU_STATE_RUNNING,         /* all normal */
      SBP2LU_STATE_IN_RESET,        /* between bus reset and reconnect */
      SBP2LU_STATE_IN_SHUTDOWN      /* when sbp2_remove was called */
};

/* For use in sbp2_lu.workarounds and in the corresponding
 * module load parameter */
#define SBP2_WORKAROUND_128K_MAX_TRANS    0x1
#define SBP2_WORKAROUND_INQUIRY_36  0x2
#define SBP2_WORKAROUND_MODE_SENSE_8      0x4
#define SBP2_WORKAROUND_FIX_CAPACITY      0x8
#define SBP2_WORKAROUND_OVERRIDE    0x100

#endif /* SBP2_H */

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