text: /*
   * Common interface for I/O on S/390
   */
  #ifndef _ASM_S390_CIO_H_
  #define _ASM_S390_CIO_H_
  
  #include <linux/spinlock.h>
  #include <linux/bitops.h>
  #include <asm/types.h>
  
  #define LPM_ANYPATH 0xff
  #define __MAX_CSSID 0
  #define __MAX_SUBCHANNEL 65535
  #define __MAX_SSID 3
  
  #include <asm/scsw.h>
  
  /**
   * struct ccw1 - channel command word
   * @cmd_code: command code
   * @flags: flags, like IDA addressing, etc.
   * @count: byte count
   * @cda: data address
   *
   * The ccw is the basic structure to build channel programs that perform
   * operations with the device or the control unit. Only Format-1 channel
   * command words are supported.
   */
  struct ccw1 {
  	__u8  cmd_code;
  	__u8  flags;
  	__u16 count;
  	__u32 cda;
  } __attribute__ ((packed,aligned(8)));
  
  #define CCW_FLAG_DC		0x80
  #define CCW_FLAG_CC		0x40
  #define CCW_FLAG_SLI		0x20
  #define CCW_FLAG_SKIP		0x10
  #define CCW_FLAG_PCI		0x08
  #define CCW_FLAG_IDA		0x04
  #define CCW_FLAG_SUSPEND	0x02
  
  #define CCW_CMD_READ_IPL	0x02
  #define CCW_CMD_NOOP		0x03
  #define CCW_CMD_BASIC_SENSE	0x04
  #define CCW_CMD_TIC		0x08
  #define CCW_CMD_STLCK           0x14
  #define CCW_CMD_SENSE_PGID	0x34
  #define CCW_CMD_SUSPEND_RECONN	0x5B
  #define CCW_CMD_RDC		0x64
  #define CCW_CMD_RELEASE		0x94
  #define CCW_CMD_SET_PGID	0xAF
  #define CCW_CMD_SENSE_ID	0xE4
  #define CCW_CMD_DCTL		0xF3
  
  #define SENSE_MAX_COUNT		0x20
  
  /**
   * struct erw - extended report word
   * @res0: reserved
   * @auth: authorization check
   * @pvrf: path-verification-required flag
   * @cpt: channel-path timeout
   * @fsavf: failing storage address validity flag
   * @cons: concurrent sense
   * @scavf: secondary ccw address validity flag
   * @fsaf: failing storage address format
   * @scnt: sense count, if @cons == %1
   * @res16: reserved
   */
  struct erw {
  	__u32 res0  : 3;
  	__u32 auth  : 1;
  	__u32 pvrf  : 1;
  	__u32 cpt   : 1;
  	__u32 fsavf : 1;
  	__u32 cons  : 1;
  	__u32 scavf : 1;
  	__u32 fsaf  : 1;
  	__u32 scnt  : 6;
  	__u32 res16 : 16;
  } __attribute__ ((packed));
  
  /**
   * struct erw_eadm - EADM Subchannel extended report word
   * @b: aob error
   * @r: arsb error
   */
  struct erw_eadm {
  	__u32 : 16;
  	__u32 b : 1;
  	__u32 r : 1;
  	__u32  : 14;
  } __packed;
  
  /**
   * struct sublog - subchannel logout area
   * @res0: reserved
   * @esf: extended status flags
   * @lpum: last path used mask
   * @arep: ancillary report
   * @fvf: field-validity flags
   * @sacc: storage access code
   * @termc: termination code
   * @devsc: device-status check
   * @serr: secondary error
   * @ioerr: i/o-error alert
   * @seqc: sequence code
   */
  struct sublog {
  	__u32 res0  : 1;
  	__u32 esf   : 7;
  	__u32 lpum  : 8;
  	__u32 arep  : 1;
  	__u32 fvf   : 5;
  	__u32 sacc  : 2;
  	__u32 termc : 2;
  	__u32 devsc : 1;
  	__u32 serr  : 1;
  	__u32 ioerr : 1;
  	__u32 seqc  : 3;
  } __attribute__ ((packed));
  
  /**
   * struct esw0 - Format 0 Extended Status Word (ESW)
   * @sublog: subchannel logout
   * @erw: extended report word
   * @faddr: failing storage address
   * @saddr: secondary ccw address
   */
  struct esw0 {
  	struct sublog sublog;
  	struct erw erw;
  	__u32  faddr[2];
  	__u32  saddr;
  } __attribute__ ((packed));
  
  /**
   * struct esw1 - Format 1 Extended Status Word (ESW)
   * @zero0: reserved zeros
   * @lpum: last path used mask
   * @zero16: reserved zeros
   * @erw: extended report word
   * @zeros: three fullwords of zeros
   */
  struct esw1 {
  	__u8  zero0;
  	__u8  lpum;
  	__u16 zero16;
  	struct erw erw;
  	__u32 zeros[3];
  } __attribute__ ((packed));
  
  /**
   * struct esw2 - Format 2 Extended Status Word (ESW)
   * @zero0: reserved zeros
   * @lpum: last path used mask
   * @dcti: device-connect-time interval
   * @erw: extended report word
   * @zeros: three fullwords of zeros
   */
  struct esw2 {
  	__u8  zero0;
  	__u8  lpum;
  	__u16 dcti;
  	struct erw erw;
  	__u32 zeros[3];
  } __attribute__ ((packed));
  
  /**
   * struct esw3 - Format 3 Extended Status Word (ESW)
   * @zero0: reserved zeros
   * @lpum: last path used mask
   * @res: reserved
   * @erw: extended report word
   * @zeros: three fullwords of zeros
   */
  struct esw3 {
  	__u8  zero0;
  	__u8  lpum;
  	__u16 res;
  	struct erw erw;
  	__u32 zeros[3];
  } __attribute__ ((packed));
  
  /**
   * struct esw_eadm - EADM Subchannel Extended Status Word (ESW)
   * @sublog: subchannel logout
   * @erw: extended report word
   */
  struct esw_eadm {
  	__u32 sublog;
  	struct erw_eadm erw;
  	__u32 : 32;
  	__u32 : 32;
  	__u32 : 32;
  } __packed;
  
  /**
   * struct irb - interruption response block
   * @scsw: subchannel status word
   * @esw: extended status word
   * @ecw: extended control word
   *
   * The irb that is handed to the device driver when an interrupt occurs. For
   * solicited interrupts, the common I/O layer already performs checks whether
   * a field is valid; a field not being valid is always passed as %0.
   * If a unit check occurred, @ecw may contain sense data; this is retrieved
   * by the common I/O layer itself if the device doesn't support concurrent
   * sense (so that the device driver never needs to perform basic sene itself).
   * For unsolicited interrupts, the irb is passed as-is (expect for sense data,
   * if applicable).
   */
  struct irb {
  	union scsw scsw;
  	union {
  		struct esw0 esw0;
  		struct esw1 esw1;
  		struct esw2 esw2;
  		struct esw3 esw3;
  		struct esw_eadm eadm;
  	} esw;
  	__u8   ecw[32];
  } __attribute__ ((packed,aligned(4)));
  
  /**
   * struct ciw - command information word  (CIW) layout
   * @et: entry type
   * @reserved: reserved bits
   * @ct: command type
   * @cmd: command code
   * @count: command count
   */
  struct ciw {
  	__u32 et       :  2;
  	__u32 reserved :  2;
  	__u32 ct       :  4;
  	__u32 cmd      :  8;
  	__u32 count    : 16;
  } __attribute__ ((packed));
  
  #define CIW_TYPE_RCD	0x0    	/* read configuration data */
  #define CIW_TYPE_SII	0x1    	/* set interface identifier */
  #define CIW_TYPE_RNI	0x2    	/* read node identifier */
  
  /*
   * Flags used as input parameters for do_IO()
   */
  #define DOIO_ALLOW_SUSPEND	 0x0001 /* allow for channel prog. suspend */
  #define DOIO_DENY_PREFETCH	 0x0002 /* don't allow for CCW prefetch */
  #define DOIO_SUPPRESS_INTER	 0x0004 /* suppress intermediate inter. */
  					/* ... for suspended CCWs */
  /* Device or subchannel gone. */
  #define CIO_GONE       0x0001
  /* No path to device. */
  #define CIO_NO_PATH    0x0002
  /* Device has appeared. */
  #define CIO_OPER       0x0004
  /* Sick revalidation of device. */
  #define CIO_REVALIDATE 0x0008
  /* Device did not respond in time. */
  #define CIO_BOXED      0x0010
  
  /**
   * struct ccw_dev_id - unique identifier for ccw devices
   * @ssid: subchannel set id
   * @devno: device number
   *
   * This structure is not directly based on any hardware structure. The
   * hardware identifies a device by its device number and its subchannel,
   * which is in turn identified by its id. In order to get a unique identifier
   * for ccw devices across subchannel sets, @struct ccw_dev_id has been
   * introduced.
   */
  struct ccw_dev_id {
  	u8 ssid;
  	u16 devno;
  };
  
  /**
   * ccw_device_id_is_equal() - compare two ccw_dev_ids
   * @dev_id1: a ccw_dev_id
   * @dev_id2: another ccw_dev_id
   * Returns:
   *  %1 if the two structures are equal field-by-field,
   *  %0 if not.
   * Context:
   *  any
   */
  static inline int ccw_dev_id_is_equal(struct ccw_dev_id *dev_id1,
  				      struct ccw_dev_id *dev_id2)
  {
  	if ((dev_id1->ssid == dev_id2->ssid) &&
  	    (dev_id1->devno == dev_id2->devno))
  		return 1;
  	return 0;
  }
  
  /**
   * pathmask_to_pos() - find the position of the left-most bit in a pathmask
   * @mask: pathmask with at least one bit set
   */
  static inline u8 pathmask_to_pos(u8 mask)
  {
  	return 8 - ffs(mask);
  }
  
  void channel_subsystem_reinit(void);
  extern void css_schedule_reprobe(void);
  
  extern void reipl_ccw_dev(struct ccw_dev_id *id);
  
  struct cio_iplinfo {
  	u8 ssid;
  	u16 devno;
  	int is_qdio;
  };
  
  extern int cio_get_iplinfo(struct cio_iplinfo *iplinfo);
  
  /* Function from drivers/s390/cio/chsc.c */
  int chsc_sstpc(void *page, unsigned int op, u16 ctrl);
  int chsc_sstpi(void *page, void *result, size_t size);
  
  #endif
  