--- /dev/null
+/*
+ * Common interface for I/O on S/390
+ */
+#ifndef _ASM_S390_CIO_H_
+#define _ASM_S390_CIO_H_
+
+#include <linux/spinlock.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;
+}
+
+void channel_subsystem_reinit(void);
+extern void css_schedule_reprobe(void);
+
+extern void reipl_ccw_dev(struct ccw_dev_id *id);
+
+struct cio_iplinfo {
+ 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
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