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/*
* I2O kernel space accessible structures/APIs
*
* (c) Copyright 1999, 2000 Red Hat Software
*
* 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 header file defined the I2O APIs/structures for use by
* the I2O kernel modules.
*
*/
#ifndef _I2O_H
#define _I2O_H
#ifdef __KERNEL__ /* This file to be included by kernel only */
#include <linux/i2o-dev.h>
/* How many different OSM's are we allowing */
#define MAX_I2O_MODULES 4
/* How many OSMs can register themselves for device status updates? */
#define I2O_MAX_MANAGERS 4
#include <asm/semaphore.h> /* Needed for MUTEX init macros */
#include <linux/config.h>
#include <linux/notifier.h>
#include <asm/atomic.h>
/*
* Message structures
*/
struct i2o_message
{
u8 version_offset;
u8 flags;
u16 size;
u32 target_tid:12;
u32 init_tid:12;
u32 function:8;
u32 initiator_context;
/* List follows */
};
/*
* Each I2O device entity has one or more of these. There is one
* per device.
*/
struct i2o_device
{
i2o_lct_entry lct_data; /* Device LCT information */
u32 flags;
int i2oversion; /* I2O version supported. Actually
* there should be high and low
* version */
struct proc_dir_entry *proc_entry; /* /proc dir */
/* Primary user */
struct i2o_handler *owner;
/* Management users */
struct i2o_handler *managers[I2O_MAX_MANAGERS];
int num_managers;
struct i2o_controller *controller; /* Controlling IOP */
struct i2o_device *next; /* Chain */
struct i2o_device *prev;
char dev_name[8]; /* linux /dev name if available */
};
/*
* Each I2O controller has one of these objects
*/
struct i2o_controller
{
char name[16];
int unit;
int type;
int enabled;
struct pci_dev *pdev; /* PCI device */
int irq;
int short_req:1; /* Use small block sizes */
int dpt:1; /* Don't quiesce */
int promise:1; /* Promise controller */
#ifdef CONFIG_MTRR
int mtrr_reg0;
int mtrr_reg1;
#endif
struct notifier_block *event_notifer; /* Events */
atomic_t users;
struct i2o_device *devices; /* I2O device chain */
struct i2o_controller *next; /* Controller chain */
unsigned long post_port; /* Inbout port address */
unsigned long reply_port; /* Outbound port address */
unsigned long irq_mask; /* Interrupt register address */
/* Dynamic LCT related data */
struct semaphore lct_sem;
int lct_pid;
int lct_running;
i2o_status_block *status_block; /* IOP status block */
dma_addr_t status_block_phys;
i2o_lct *lct; /* Logical Config Table */
dma_addr_t lct_phys;
i2o_lct *dlct; /* Temp LCT */
dma_addr_t dlct_phys;
i2o_hrt *hrt; /* HW Resource Table */
dma_addr_t hrt_phys;
u32 hrt_len;
unsigned long mem_offset; /* MFA offset */
unsigned long mem_phys; /* MFA physical */
int battery:1; /* Has a battery backup */
int io_alloc:1; /* An I/O resource was allocated */
int mem_alloc:1; /* A memory resource was allocated */
struct resource io_resource; /* I/O resource allocated to the IOP */
struct resource mem_resource; /* Mem resource allocated to the IOP */
struct proc_dir_entry *proc_entry; /* /proc dir */
void *page_frame; /* Message buffers */
dma_addr_t page_frame_map; /* Cache map */
};
/*
* OSM resgistration block
*
* Each OSM creates at least one of these and registers it with the
* I2O core through i2o_register_handler. An OSM may want to
* register more than one if it wants a fast path to a reply
* handler by having a separate initiator context for each
* class function.
*/
struct i2o_handler
{
/* Message reply handler */
void (*reply)(struct i2o_handler *, struct i2o_controller *,
struct i2o_message *);
/* New device notification handler */
void (*new_dev_notify)(struct i2o_controller *, struct i2o_device *);
/* Device deltion handler */
void (*dev_del_notify)(struct i2o_controller *, struct i2o_device *);
/* Reboot notification handler */
void (*reboot_notify)(void);
char *name; /* OSM name */
int context; /* Low 8 bits of the transaction info */
u32 class; /* I2O classes that this driver handles */
/* User data follows */
};
#ifdef MODULE
/*
* Used by bus specific modules to communicate with the core
*
* This is needed because the bus modules cannot make direct
* calls to the core as this results in the i2o_bus_specific_module
* being dependent on the core, not the otherway around.
* In that case, a 'modprobe i2o_lan' loads i2o_core & i2o_lan,
* but _not_ i2o_pci...which makes the whole thing pretty useless :)
*
*/
struct i2o_core_func_table
{
int (*install)(struct i2o_controller *);
int (*activate)(struct i2o_controller *);
struct i2o_controller *(*find)(int);
void (*unlock)(struct i2o_controller *);
void (*run_queue)(struct i2o_controller * c);
int (*delete)(struct i2o_controller *);
};
#endif /* MODULE */
/*
* I2O System table entry
*
* The system table contains information about all the IOPs in the
* system. It is sent to all IOPs so that they can create peer2peer
* connections between them.
*/
struct i2o_sys_tbl_entry
{
u16 org_id;
u16 reserved1;
u32 iop_id:12;
u32 reserved2:20;
u16 seg_num:12;
u16 i2o_version:4;
u8 iop_state;
u8 msg_type;
u16 frame_size;
u16 reserved3;
u32 last_changed;
u32 iop_capabilities;
u32 inbound_low;
u32 inbound_high;
};
struct i2o_sys_tbl
{
u8 num_entries;
u8 version;
u16 reserved1;
u32 change_ind;
u32 reserved2;
u32 reserved3;
struct i2o_sys_tbl_entry iops[0];
};
/*
* Messenger inlines
*/
static inline u32 I2O_POST_READ32(struct i2o_controller *c)
{
return readl(c->post_port);
}
static inline void I2O_POST_WRITE32(struct i2o_controller *c, u32 val)
{
writel(val, c->post_port);
}
static inline u32 I2O_REPLY_READ32(struct i2o_controller *c)
{
return readl(c->reply_port);
}
static inline void I2O_REPLY_WRITE32(struct i2o_controller *c, u32 val)
{
writel(val, c->reply_port);
}
static inline u32 I2O_IRQ_READ32(struct i2o_controller *c)
{
return readl(c->irq_mask);
}
static inline void I2O_IRQ_WRITE32(struct i2o_controller *c, u32 val)
{
writel(val, c->irq_mask);
}
static inline void i2o_post_message(struct i2o_controller *c, u32 m)
{
/* The second line isnt spurious - thats forcing PCI posting */
I2O_POST_WRITE32(c, m);
(void) I2O_IRQ_READ32(c);
}
static inline void i2o_flush_reply(struct i2o_controller *c, u32 m)
{
I2O_REPLY_WRITE32(c, m);
}
/*
* Endian handling wrapped into the macro - keeps the core code
* cleaner.
*/
#define i2o_raw_writel(val, mem) __raw_writel(cpu_to_le32(val), mem)
extern struct i2o_controller *i2o_find_controller(int);
extern void i2o_unlock_controller(struct i2o_controller *);
extern struct i2o_controller *i2o_controller_chain;
extern int i2o_num_controllers;
extern int i2o_status_get(struct i2o_controller *);
extern int i2o_install_handler(struct i2o_handler *);
extern int i2o_remove_handler(struct i2o_handler *);
extern int i2o_claim_device(struct i2o_device *, struct i2o_handler *);
extern int i2o_release_device(struct i2o_device *, struct i2o_handler *);
extern int i2o_device_notify_on(struct i2o_device *, struct i2o_handler *);
extern int i2o_device_notify_off(struct i2o_device *,
struct i2o_handler *);
extern int i2o_post_this(struct i2o_controller *, u32 *, int);
extern int i2o_post_wait(struct i2o_controller *, u32 *, int, int);
extern int i2o_post_wait_mem(struct i2o_controller *, u32 *, int, int,
void *, void *, dma_addr_t, dma_addr_t, int, int);
extern int i2o_query_scalar(struct i2o_controller *, int, int, int, void *,
int);
extern int i2o_set_scalar(struct i2o_controller *, int, int, int, void *,
int);
extern int i2o_query_table(int, struct i2o_controller *, int, int, int,
void *, int, void *, int);
extern int i2o_clear_table(struct i2o_controller *, int, int);
extern int i2o_row_add_table(struct i2o_controller *, int, int, int,
void *, int);
extern int i2o_issue_params(int, struct i2o_controller *, int, void *, int,
void *, int);
extern int i2o_event_register(struct i2o_controller *, u32, u32, u32, u32);
extern int i2o_event_ack(struct i2o_controller *, u32 *);
extern void i2o_report_status(const char *, const char *, u32 *);
extern void i2o_dump_message(u32 *);
extern const char *i2o_get_class_name(int);
extern int i2o_install_controller(struct i2o_controller *);
extern int i2o_activate_controller(struct i2o_controller *);
extern void i2o_run_queue(struct i2o_controller *);
extern int i2o_delete_controller(struct i2o_controller *);
/*
* Cache strategies
*/
/* The NULL strategy leaves everything up to the controller. This tends to be a
* pessimal but functional choice.
*/
#define CACHE_NULL 0
/* Prefetch data when reading. We continually attempt to load the next 32 sectors
* into the controller cache.
*/
#define CACHE_PREFETCH 1
/* Prefetch data when reading. We sometimes attempt to load the next 32 sectors
* into the controller cache. When an I/O is less <= 8K we assume its probably
* not sequential and don't prefetch (default)
*/
#define CACHE_SMARTFETCH 2
/* Data is written to the cache and then out on to the disk. The I/O must be
* physically on the medium before the write is acknowledged (default without
* NVRAM)
*/
#define CACHE_WRITETHROUGH 17
/* Data is written to the cache and then out on to the disk. The controller
* is permitted to write back the cache any way it wants. (default if battery
* backed NVRAM is present). It can be useful to set this for swap regardless of
* battery state.
*/
#define CACHE_WRITEBACK 18
/* Optimise for under powered controllers, especially on RAID1 and RAID0. We
* write large I/O's directly to disk bypassing the cache to avoid the extra
* memory copy hits. Small writes are writeback cached
*/
#define CACHE_SMARTBACK 19
/* Optimise for under powered controllers, especially on RAID1 and RAID0. We
* write large I/O's directly to disk bypassing the cache to avoid the extra
* memory copy hits. Small writes are writethrough cached. Suitable for devices
* lacking battery backup
*/
#define CACHE_SMARTTHROUGH 20
/*
* Ioctl structures
*/
#define BLKI2OGRSTRAT _IOR('2', 1, int)
#define BLKI2OGWSTRAT _IOR('2', 2, int)
#define BLKI2OSRSTRAT _IOW('2', 3, int)
#define BLKI2OSWSTRAT _IOW('2', 4, int)
/*
* I2O Function codes
*/
/*
* Executive Class
*/
#define I2O_CMD_ADAPTER_ASSIGN 0xB3
#define I2O_CMD_ADAPTER_READ 0xB2
#define I2O_CMD_ADAPTER_RELEASE 0xB5
#define I2O_CMD_BIOS_INFO_SET 0xA5
#define I2O_CMD_BOOT_DEVICE_SET 0xA7
#define I2O_CMD_CONFIG_VALIDATE 0xBB
#define I2O_CMD_CONN_SETUP 0xCA
#define I2O_CMD_DDM_DESTROY 0xB1
#define I2O_CMD_DDM_ENABLE 0xD5
#define I2O_CMD_DDM_QUIESCE 0xC7
#define I2O_CMD_DDM_RESET 0xD9
#define I2O_CMD_DDM_SUSPEND 0xAF
#define I2O_CMD_DEVICE_ASSIGN 0xB7
#define I2O_CMD_DEVICE_RELEASE 0xB9
#define I2O_CMD_HRT_GET 0xA8
#define I2O_CMD_ADAPTER_CLEAR 0xBE
#define I2O_CMD_ADAPTER_CONNECT 0xC9
#define I2O_CMD_ADAPTER_RESET 0xBD
#define I2O_CMD_LCT_NOTIFY 0xA2
#define I2O_CMD_OUTBOUND_INIT 0xA1
#define I2O_CMD_PATH_ENABLE 0xD3
#define I2O_CMD_PATH_QUIESCE 0xC5
#define I2O_CMD_PATH_RESET 0xD7
#define I2O_CMD_STATIC_MF_CREATE 0xDD
#define I2O_CMD_STATIC_MF_RELEASE 0xDF
#define I2O_CMD_STATUS_GET 0xA0
#define I2O_CMD_SW_DOWNLOAD 0xA9
#define I2O_CMD_SW_UPLOAD 0xAB
#define I2O_CMD_SW_REMOVE 0xAD
#define I2O_CMD_SYS_ENABLE 0xD1
#define I2O_CMD_SYS_MODIFY 0xC1
#define I2O_CMD_SYS_QUIESCE 0xC3
#define I2O_CMD_SYS_TAB_SET 0xA3
/*
* Utility Class
*/
#define I2O_CMD_UTIL_NOP 0x00
#define I2O_CMD_UTIL_ABORT 0x01
#define I2O_CMD_UTIL_CLAIM 0x09
#define I2O_CMD_UTIL_RELEASE 0x0B
#define I2O_CMD_UTIL_PARAMS_GET 0x06
#define I2O_CMD_UTIL_PARAMS_SET 0x05
#define I2O_CMD_UTIL_EVT_REGISTER 0x13
#define I2O_CMD_UTIL_EVT_ACK 0x14
#define I2O_CMD_UTIL_CONFIG_DIALOG 0x10
#define I2O_CMD_UTIL_DEVICE_RESERVE 0x0D
#define I2O_CMD_UTIL_DEVICE_RELEASE 0x0F
#define I2O_CMD_UTIL_LOCK 0x17
#define I2O_CMD_UTIL_LOCK_RELEASE 0x19
#define I2O_CMD_UTIL_REPLY_FAULT_NOTIFY 0x15
/*
* SCSI Host Bus Adapter Class
*/
#define I2O_CMD_SCSI_EXEC 0x81
#define I2O_CMD_SCSI_ABORT 0x83
#define I2O_CMD_SCSI_BUSRESET 0x27
/*
* Random Block Storage Class
*/
#define I2O_CMD_BLOCK_READ 0x30
#define I2O_CMD_BLOCK_WRITE 0x31
#define I2O_CMD_BLOCK_CFLUSH 0x37
#define I2O_CMD_BLOCK_MLOCK 0x49
#define I2O_CMD_BLOCK_MUNLOCK 0x4B
#define I2O_CMD_BLOCK_MMOUNT 0x41
#define I2O_CMD_BLOCK_MEJECT 0x43
#define I2O_CMD_BLOCK_POWER 0x70
#define I2O_PRIVATE_MSG 0xFF
/* Command status values */
#define I2O_CMD_IN_PROGRESS 0x01
#define I2O_CMD_REJECTED 0x02
#define I2O_CMD_FAILED 0x03
#define I2O_CMD_COMPLETED 0x04
/* I2O API function return values */
#define I2O_RTN_NO_ERROR 0
#define I2O_RTN_NOT_INIT 1
#define I2O_RTN_FREE_Q_EMPTY 2
#define I2O_RTN_TCB_ERROR 3
#define I2O_RTN_TRANSACTION_ERROR 4
#define I2O_RTN_ADAPTER_ALREADY_INIT 5
#define I2O_RTN_MALLOC_ERROR 6
#define I2O_RTN_ADPTR_NOT_REGISTERED 7
#define I2O_RTN_MSG_REPLY_TIMEOUT 8
#define I2O_RTN_NO_STATUS 9
#define I2O_RTN_NO_FIRM_VER 10
#define I2O_RTN_NO_LINK_SPEED 11
/* Reply message status defines for all messages */
#define I2O_REPLY_STATUS_SUCCESS 0x00
#define I2O_REPLY_STATUS_ABORT_DIRTY 0x01
#define I2O_REPLY_STATUS_ABORT_NO_DATA_TRANSFER 0x02
#define I2O_REPLY_STATUS_ABORT_PARTIAL_TRANSFER 0x03
#define I2O_REPLY_STATUS_ERROR_DIRTY 0x04
#define I2O_REPLY_STATUS_ERROR_NO_DATA_TRANSFER 0x05
#define I2O_REPLY_STATUS_ERROR_PARTIAL_TRANSFER 0x06
#define I2O_REPLY_STATUS_PROCESS_ABORT_DIRTY 0x08
#define I2O_REPLY_STATUS_PROCESS_ABORT_NO_DATA_TRANSFER 0x09
#define I2O_REPLY_STATUS_PROCESS_ABORT_PARTIAL_TRANSFER 0x0A
#define I2O_REPLY_STATUS_TRANSACTION_ERROR 0x0B
#define I2O_REPLY_STATUS_PROGRESS_REPORT 0x80
/* Status codes and Error Information for Parameter functions */
#define I2O_PARAMS_STATUS_SUCCESS 0x00
#define I2O_PARAMS_STATUS_BAD_KEY_ABORT 0x01
#define I2O_PARAMS_STATUS_BAD_KEY_CONTINUE 0x02
#define I2O_PARAMS_STATUS_BUFFER_FULL 0x03
#define I2O_PARAMS_STATUS_BUFFER_TOO_SMALL 0x04
#define I2O_PARAMS_STATUS_FIELD_UNREADABLE 0x05
#define I2O_PARAMS_STATUS_FIELD_UNWRITEABLE 0x06
#define I2O_PARAMS_STATUS_INSUFFICIENT_FIELDS 0x07
#define I2O_PARAMS_STATUS_INVALID_GROUP_ID 0x08
#define I2O_PARAMS_STATUS_INVALID_OPERATION 0x09
#define I2O_PARAMS_STATUS_NO_KEY_FIELD 0x0A
#define I2O_PARAMS_STATUS_NO_SUCH_FIELD 0x0B
#define I2O_PARAMS_STATUS_NON_DYNAMIC_GROUP 0x0C
#define I2O_PARAMS_STATUS_OPERATION_ERROR 0x0D
#define I2O_PARAMS_STATUS_SCALAR_ERROR 0x0E
#define I2O_PARAMS_STATUS_TABLE_ERROR 0x0F
#define I2O_PARAMS_STATUS_WRONG_GROUP_TYPE 0x10
/* DetailedStatusCode defines for Executive, DDM, Util and Transaction error
* messages: Table 3-2 Detailed Status Codes.*/
#define I2O_DSC_SUCCESS 0x0000
#define I2O_DSC_BAD_KEY 0x0002
#define I2O_DSC_TCL_ERROR 0x0003
#define I2O_DSC_REPLY_BUFFER_FULL 0x0004
#define I2O_DSC_NO_SUCH_PAGE 0x0005
#define I2O_DSC_INSUFFICIENT_RESOURCE_SOFT 0x0006
#define I2O_DSC_INSUFFICIENT_RESOURCE_HARD 0x0007
#define I2O_DSC_CHAIN_BUFFER_TOO_LARGE 0x0009
#define I2O_DSC_UNSUPPORTED_FUNCTION 0x000A
#define I2O_DSC_DEVICE_LOCKED 0x000B
#define I2O_DSC_DEVICE_RESET 0x000C
#define I2O_DSC_INAPPROPRIATE_FUNCTION 0x000D
#define I2O_DSC_INVALID_INITIATOR_ADDRESS 0x000E
#define I2O_DSC_INVALID_MESSAGE_FLAGS 0x000F
#define I2O_DSC_INVALID_OFFSET 0x0010
#define I2O_DSC_INVALID_PARAMETER 0x0011
#define I2O_DSC_INVALID_REQUEST 0x0012
#define I2O_DSC_INVALID_TARGET_ADDRESS 0x0013
#define I2O_DSC_MESSAGE_TOO_LARGE 0x0014
#define I2O_DSC_MESSAGE_TOO_SMALL 0x0015
#define I2O_DSC_MISSING_PARAMETER 0x0016
#define I2O_DSC_TIMEOUT 0x0017
#define I2O_DSC_UNKNOWN_ERROR 0x0018
#define I2O_DSC_UNKNOWN_FUNCTION 0x0019
#define I2O_DSC_UNSUPPORTED_VERSION 0x001A
#define I2O_DSC_DEVICE_BUSY 0x001B
#define I2O_DSC_DEVICE_NOT_AVAILABLE 0x001C
/* FailureStatusCodes, Table 3-3 Message Failure Codes */
#define I2O_FSC_TRANSPORT_SERVICE_SUSPENDED 0x81
#define I2O_FSC_TRANSPORT_SERVICE_TERMINATED 0x82
#define I2O_FSC_TRANSPORT_CONGESTION 0x83
#define I2O_FSC_TRANSPORT_FAILURE 0x84
#define I2O_FSC_TRANSPORT_STATE_ERROR 0x85
#define I2O_FSC_TRANSPORT_TIME_OUT 0x86
#define I2O_FSC_TRANSPORT_ROUTING_FAILURE 0x87
#define I2O_FSC_TRANSPORT_INVALID_VERSION 0x88
#define I2O_FSC_TRANSPORT_INVALID_OFFSET 0x89
#define I2O_FSC_TRANSPORT_INVALID_MSG_FLAGS 0x8A
#define I2O_FSC_TRANSPORT_FRAME_TOO_SMALL 0x8B
#define I2O_FSC_TRANSPORT_FRAME_TOO_LARGE 0x8C
#define I2O_FSC_TRANSPORT_INVALID_TARGET_ID 0x8D
#define I2O_FSC_TRANSPORT_INVALID_INITIATOR_ID 0x8E
#define I2O_FSC_TRANSPORT_INVALID_INITIATOR_CONTEXT 0x8F
#define I2O_FSC_TRANSPORT_UNKNOWN_FAILURE 0xFF
/* Device Claim Types */
#define I2O_CLAIM_PRIMARY 0x01000000
#define I2O_CLAIM_MANAGEMENT 0x02000000
#define I2O_CLAIM_AUTHORIZED 0x03000000
#define I2O_CLAIM_SECONDARY 0x04000000
/* Message header defines for VersionOffset */
#define I2OVER15 0x0001
#define I2OVER20 0x0002
/* Default is 1.5, FIXME: Need support for both 1.5 and 2.0 */
#define I2OVERSION I2OVER15
#define SGL_OFFSET_0 I2OVERSION
#define SGL_OFFSET_4 (0x0040 | I2OVERSION)
#define SGL_OFFSET_5 (0x0050 | I2OVERSION)
#define SGL_OFFSET_6 (0x0060 | I2OVERSION)
#define SGL_OFFSET_7 (0x0070 | I2OVERSION)
#define SGL_OFFSET_8 (0x0080 | I2OVERSION)
#define SGL_OFFSET_9 (0x0090 | I2OVERSION)
#define SGL_OFFSET_10 (0x00A0 | I2OVERSION)
#define TRL_OFFSET_5 (0x0050 | I2OVERSION)
#define TRL_OFFSET_6 (0x0060 | I2OVERSION)
/* Transaction Reply Lists (TRL) Control Word structure */
#define TRL_SINGLE_FIXED_LENGTH 0x00
#define TRL_SINGLE_VARIABLE_LENGTH 0x40
#define TRL_MULTIPLE_FIXED_LENGTH 0x80
/* msg header defines for MsgFlags */
#define MSG_STATIC 0x0100
#define MSG_64BIT_CNTXT 0x0200
#define MSG_MULTI_TRANS 0x1000
#define MSG_FAIL 0x2000
#define MSG_FINAL 0x4000
#define MSG_REPLY 0x8000
/* minimum size msg */
#define THREE_WORD_MSG_SIZE 0x00030000
#define FOUR_WORD_MSG_SIZE 0x00040000
#define FIVE_WORD_MSG_SIZE 0x00050000
#define SIX_WORD_MSG_SIZE 0x00060000
#define SEVEN_WORD_MSG_SIZE 0x00070000
#define EIGHT_WORD_MSG_SIZE 0x00080000
#define NINE_WORD_MSG_SIZE 0x00090000
#define TEN_WORD_MSG_SIZE 0x000A0000
#define ELEVEN_WORD_MSG_SIZE 0x000B0000
#define I2O_MESSAGE_SIZE(x) ((x)<<16)
/* Special TID Assignments */
#define ADAPTER_TID 0
#define HOST_TID 1
#define MSG_FRAME_SIZE 64 /* i2o_scsi assumes >= 32 */
#define NMBR_MSG_FRAMES 128
#define MSG_POOL_SIZE (MSG_FRAME_SIZE*NMBR_MSG_FRAMES*sizeof(u32))
#define I2O_POST_WAIT_OK 0
#define I2O_POST_WAIT_TIMEOUT -ETIMEDOUT
#endif /* __KERNEL__ */
#endif /* _I2O_H */