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* include/asm-s390/ccwdev.h
* include/asm-s390x/ccwdev.h
* Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Arnd Bergmann <>
* Interface for CCW device drivers
#ifndef _S390_CCWDEV_H_
#define _S390_CCWDEV_H_
#include <linux/device.h>
#include <linux/mod_devicetable.h>
/* structs from asm/cio.h */
struct irb;
struct ccw1;
/* simplified initializers for struct ccw_device:
* CCW_DEVICE and CCW_DEVICE_DEVTYPE initialize one
* entry in your MODULE_DEVICE_TABLE and set the match_flag correctly */
#define CCW_DEVICE(cu, cum) \
.cu_type=(cu), .cu_model=(cum), \
#define CCW_DEVICE_DEVTYPE(cu, cum, dev, devm) \
.cu_type=(cu), .cu_model=(cum), .dev_type=(dev), .dev_model=(devm),\
| ((cum) ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0) \
/* scan through an array of device ids and return the first
* entry that matches the device.
* the array must end with an entry containing zero match_flags
static inline const struct ccw_device_id *
ccw_device_id_match(const struct ccw_device_id *array,
const struct ccw_device_id *match)
const struct ccw_device_id *id = array;
for (id = array; id->match_flags; id++) {
if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_TYPE)
&& (id->cu_type != match->cu_type))
if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_MODEL)
&& (id->cu_model != match->cu_model))
if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_TYPE)
&& (id->dev_type != match->dev_type))
if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_MODEL)
&& (id->dev_model != match->dev_model))
return id;
return NULL;
/* The struct ccw device is our replacement for the globally accessible
* ioinfo array. ioinfo will mutate into a subchannel device later.
* Reference: Documentation/s390/driver-model.txt */
struct ccw_device {
spinlock_t *ccwlock;
struct ccw_device_private *private; /* cio private information */
struct ccw_device_id id; /* id of this device, driver_info is
set by ccw_find_driver */
struct ccw_driver *drv; /* */
struct device dev; /* */
int online;
/* This is sick, but a driver can have different interrupt handlers
for different ccw_devices (multi-subchannel drivers)... */
void (*handler) (struct ccw_device *, unsigned long, struct irb *);
/* Each ccw driver registers with the ccw root bus */
struct ccw_driver {
struct module *owner; /* for automatic MOD_INC_USE_COUNT */
struct ccw_device_id *ids; /* probe driver with these devs */
int (*probe) (struct ccw_device *); /* ask driver to probe dev */
void (*remove) (struct ccw_device *);
/* device is no longer available */
int (*set_online) (struct ccw_device *);
int (*set_offline) (struct ccw_device *);
int (*notify) (struct ccw_device *, int);
struct device_driver driver; /* higher level structure, don't init
this from your driver */
char *name;
extern struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
const char *bus_id);
/* devices drivers call these during module load and unload.
* When a driver is registered, its probe method is called
* when new devices for its type pop up */
extern int ccw_driver_register (struct ccw_driver *driver);
extern void ccw_driver_unregister (struct ccw_driver *driver);
struct ccw1;
extern int ccw_device_set_options(struct ccw_device *, unsigned long);
/* Allow for i/o completion notification after primary interrupt status. */
/* Report all interrupt conditions. */
#define CCWDEV_REPORT_ALL 0x0002
/* Try to perform path grouping. */
#define CCWDEV_DO_PATHGROUP 0x0004
/* Allow forced onlining of boxed devices. */
#define CCWDEV_ALLOW_FORCE 0x0008
* ccw_device_start()
* Start a S/390 channel program. When the interrupt arrives, the
* IRQ handler is called, either immediately, delayed (dev-end missing,
* or sense required) or never (no IRQ handler registered).
* Depending on the action taken, ccw_device_start() returns:
* 0 - Success
* -EBUSY - Device busy, or status pending
* -ENODEV - Device not operational
* -EINVAL - Device invalid for operation
extern int ccw_device_start(struct ccw_device *, struct ccw1 *,
unsigned long, __u8, unsigned long);
* ccw_device_start_timeout()
* This function notifies the device driver if the channel program has not
* completed during the specified time. If a timeout occurs, the channel
* program is terminated via xsch(), hsch() or csch().
extern int ccw_device_start_timeout(struct ccw_device *, struct ccw1 *,
unsigned long, __u8, unsigned long, int);
* ccw_device_start_key()
* ccw_device_start_key_timeout()
* Same as ccw_device_start() and ccw_device_start_timeout(), except a
* storage key != default key can be provided for the I/O.
extern int ccw_device_start_key(struct ccw_device *, struct ccw1 *,
unsigned long, __u8, __u8, unsigned long);
extern int ccw_device_start_timeout_key(struct ccw_device *, struct ccw1 *,
unsigned long, __u8, __u8,
unsigned long, int);
extern int ccw_device_resume(struct ccw_device *);
extern int ccw_device_halt(struct ccw_device *, unsigned long);
extern int ccw_device_clear(struct ccw_device *, unsigned long);
extern int read_dev_chars(struct ccw_device *cdev, void **buffer, int length);
extern int read_conf_data(struct ccw_device *cdev, void **buffer, int *length);
extern int read_conf_data_lpm(struct ccw_device *cdev, void **buffer,
int *length, __u8 lpm);
extern int ccw_device_set_online(struct ccw_device *cdev);
extern int ccw_device_set_offline(struct ccw_device *cdev);
extern struct ciw *ccw_device_get_ciw(struct ccw_device *, __u32 cmd);
extern __u8 ccw_device_get_path_mask(struct ccw_device *);
#define get_ccwdev_lock(x) (x)->ccwlock
#define to_ccwdev(n) container_of(n, struct ccw_device, dev)
#define to_ccwdrv(n) container_of(n, struct ccw_driver, driver)
extern struct ccw_device *ccw_device_probe_console(void);
// FIXME: these have to go
extern int _ccw_device_get_device_number(struct ccw_device *);
extern int _ccw_device_get_subchannel_number(struct ccw_device *);
extern void *ccw_device_get_chp_desc(struct ccw_device *, int);
#endif /* _S390_CCWDEV_H_ */