#ifndef S390_IO_SCH_H
  #define S390_IO_SCH_H
  
  #include <linux/types.h>
  #include <asm/schid.h>
  #include <asm/ccwdev.h>
  #include <asm/irq.h>
  #include "css.h"
  #include "orb.h"
  
  struct io_subchannel_private {
  	union orb orb;		/* operation request block */
  	struct ccw1 sense_ccw;	/* static ccw for sense command */
  	struct ccw_device *cdev;/* pointer to the child ccw device */
  	struct {
  		unsigned int suspend:1;	/* allow suspend */
  		unsigned int prefetch:1;/* deny prefetch */
  		unsigned int inter:1;	/* suppress intermediate interrupts */
  	} __packed options;
  } __aligned(8);
  
  #define to_io_private(n) ((struct io_subchannel_private *) \
  			  dev_get_drvdata(&(n)->dev))
  #define set_io_private(n, p) (dev_set_drvdata(&(n)->dev, p))
  
  static inline struct ccw_device *sch_get_cdev(struct subchannel *sch)
  {
  	struct io_subchannel_private *priv = to_io_private(sch);
  	return priv ? priv->cdev : NULL;
  }
  
  static inline void sch_set_cdev(struct subchannel *sch,
  				struct ccw_device *cdev)
  {
  	struct io_subchannel_private *priv = to_io_private(sch);
  	if (priv)
  		priv->cdev = cdev;
  }
  
  #define MAX_CIWS 8
  
  /*
   * Possible status values for a CCW request's I/O.
   */
  enum io_status {
  	IO_DONE,
  	IO_RUNNING,
  	IO_STATUS_ERROR,
  	IO_PATH_ERROR,
  	IO_REJECTED,
  	IO_KILLED
  };
  
  /**
   * ccw_request - Internal CCW request.
   * @cp: channel program to start
   * @timeout: maximum allowable time in jiffies between start I/O and interrupt
   * @maxretries: number of retries per I/O operation and path
   * @lpm: mask of paths to use
   * @check: optional callback that determines if results are final
   * @filter: optional callback to adjust request status based on IRB data
   * @callback: final callback
   * @data: user-defined pointer passed to all callbacks
   * @singlepath: if set, use only one path from @lpm per start I/O
   * @cancel: non-zero if request was cancelled
   * @done: non-zero if request was finished
   * @mask: current path mask
   * @retries: current number of retries
   * @drc: delayed return code
   */
  struct ccw_request {
  	struct ccw1 *cp;
  	unsigned long timeout;
  	u16 maxretries;
  	u8 lpm;
  	int (*check)(struct ccw_device *, void *);
  	enum io_status (*filter)(struct ccw_device *, void *, struct irb *,
  				 enum io_status);
  	void (*callback)(struct ccw_device *, void *, int);
  	void *data;
  	unsigned int singlepath:1;
  	/* These fields are used internally. */
  	unsigned int cancel:1;
  	unsigned int done:1;
  	u16 mask;
  	u16 retries;
  	int drc;
  } __attribute__((packed));
  
  /*
   * sense-id response buffer layout
   */
  struct senseid {
  	/* common part */
  	u8  reserved;	/* always 0x'FF' */
  	u16 cu_type;	/* control unit type */
  	u8  cu_model;	/* control unit model */
  	u16 dev_type;	/* device type */
  	u8  dev_model;	/* device model */
  	u8  unused;	/* padding byte */
  	/* extended part */
  	struct ciw ciw[MAX_CIWS];	/* variable # of CIWs */
  }  __attribute__ ((packed, aligned(4)));
  
  enum cdev_todo {
  	CDEV_TODO_NOTHING,
  	CDEV_TODO_ENABLE_CMF,
  	CDEV_TODO_REBIND,
  	CDEV_TODO_REGISTER,
  	CDEV_TODO_UNREG,
  	CDEV_TODO_UNREG_EVAL,
  };
  
  #define FAKE_CMD_IRB	1
  #define FAKE_TM_IRB	2
  
  struct ccw_device_private {
  	struct ccw_device *cdev;
  	struct subchannel *sch;
  	int state;		/* device state */
  	atomic_t onoff;
  	struct ccw_dev_id dev_id;	/* device id */
  	struct subchannel_id schid;	/* subchannel number */
  	struct ccw_request req;		/* internal I/O request */
  	int iretry;
  	u8 pgid_valid_mask;	/* mask of valid PGIDs */
  	u8 pgid_todo_mask;	/* mask of PGIDs to be adjusted */
  	u8 pgid_reset_mask;	/* mask of PGIDs which were reset */
  	u8 path_noirq_mask;	/* mask of paths for which no irq was
  				   received */
  	u8 path_notoper_mask;	/* mask of paths which were found
  				   not operable */
  	u8 path_gone_mask;	/* mask of paths, that became unavailable */
  	u8 path_new_mask;	/* mask of paths, that became available */
  	struct {
  		unsigned int fast:1;	/* post with "channel end" */
  		unsigned int repall:1;	/* report every interrupt status */
  		unsigned int pgroup:1;	/* do path grouping */
  		unsigned int force:1;	/* allow forced online */
  		unsigned int mpath:1;	/* do multipathing */
  	} __attribute__ ((packed)) options;
  	struct {
  		unsigned int esid:1;	    /* Ext. SenseID supported by HW */
  		unsigned int dosense:1;	    /* delayed SENSE required */
  		unsigned int doverify:1;    /* delayed path verification */
  		unsigned int donotify:1;    /* call notify function */
  		unsigned int recog_done:1;  /* dev. recog. complete */
  		unsigned int fake_irb:2;    /* deliver faked irb */
  		unsigned int resuming:1;    /* recognition while resume */
  		unsigned int pgroup:1;	    /* pathgroup is set up */
  		unsigned int mpath:1;	    /* multipathing is set up */
  		unsigned int pgid_unknown:1;/* unknown pgid state */
  		unsigned int initialized:1; /* set if initial reference held */
  	} __attribute__((packed)) flags;
  	unsigned long intparm;	/* user interruption parameter */
  	struct qdio_irq *qdio_data;
  	struct irb irb;		/* device status */
  	struct senseid senseid;	/* SenseID info */
  	struct pgid pgid[8];	/* path group IDs per chpid*/
  	struct ccw1 iccws[2];	/* ccws for SNID/SID/SPGID commands */
  	struct work_struct todo_work;
  	enum cdev_todo todo;
  	wait_queue_head_t wait_q;
  	struct timer_list timer;
  	void *cmb;			/* measurement information */
  	struct list_head cmb_list;	/* list of measured devices */
  	u64 cmb_start_time;		/* clock value of cmb reset */
  	void *cmb_wait;			/* deferred cmb enable/disable */
  	enum interruption_class int_class;
  };
  
  static inline int rsch(struct subchannel_id schid)
  {
  	register struct subchannel_id reg1 asm("1") = schid;
  	int ccode;
  
  	asm volatile(
  		"	rsch
  "
  		"	ipm	%0
  "
  		"	srl	%0,28"
  		: "=d" (ccode)
  		: "d" (reg1)
  		: "cc", "memory");
  	return ccode;
  }
  
  static inline int hsch(struct subchannel_id schid)
  {
  	register struct subchannel_id reg1 asm("1") = schid;
  	int ccode;
  
  	asm volatile(
  		"	hsch
  "
  		"	ipm	%0
  "
  		"	srl	%0,28"
  		: "=d" (ccode)
  		: "d" (reg1)
  		: "cc");
  	return ccode;
  }
  
  static inline int xsch(struct subchannel_id schid)
  {
  	register struct subchannel_id reg1 asm("1") = schid;
  	int ccode;
  
  	asm volatile(
  		"	.insn	rre,0xb2760000,%1,0
  "
  		"	ipm	%0
  "
  		"	srl	%0,28"
  		: "=d" (ccode)
  		: "d" (reg1)
  		: "cc");
  	return ccode;
  }
  
  #endif