190 lines
6.5 KiB
C
190 lines
6.5 KiB
C
/*
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* include/asm-s390/ccwdev.h
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* include/asm-s390x/ccwdev.h
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*
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* Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Arnd Bergmann <arndb@de.ibm.com>
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*
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* Interface for CCW device drivers
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*/
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#ifndef _S390_CCWDEV_H_
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#define _S390_CCWDEV_H_
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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/* structs from asm/cio.h */
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struct irb;
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struct ccw1;
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/* simplified initializers for struct ccw_device:
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* CCW_DEVICE and CCW_DEVICE_DEVTYPE initialize one
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* entry in your MODULE_DEVICE_TABLE and set the match_flag correctly */
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#define CCW_DEVICE(cu, cum) \
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.cu_type=(cu), .cu_model=(cum), \
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.match_flags=(CCW_DEVICE_ID_MATCH_CU_TYPE \
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| (cum ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0))
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#define CCW_DEVICE_DEVTYPE(cu, cum, dev, devm) \
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.cu_type=(cu), .cu_model=(cum), .dev_type=(dev), .dev_model=(devm),\
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.match_flags=CCW_DEVICE_ID_MATCH_CU_TYPE \
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| ((cum) ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0) \
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| CCW_DEVICE_ID_MATCH_DEVICE_TYPE \
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| ((devm) ? CCW_DEVICE_ID_MATCH_DEVICE_MODEL : 0)
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/* scan through an array of device ids and return the first
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* entry that matches the device.
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*
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* the array must end with an entry containing zero match_flags
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*/
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static inline const struct ccw_device_id *
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ccw_device_id_match(const struct ccw_device_id *array,
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const struct ccw_device_id *match)
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{
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const struct ccw_device_id *id = array;
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for (id = array; id->match_flags; id++) {
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if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_TYPE)
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&& (id->cu_type != match->cu_type))
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continue;
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if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_MODEL)
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&& (id->cu_model != match->cu_model))
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continue;
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if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_TYPE)
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&& (id->dev_type != match->dev_type))
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continue;
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if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_MODEL)
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&& (id->dev_model != match->dev_model))
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continue;
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return id;
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}
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return NULL;
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}
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/* The struct ccw device is our replacement for the globally accessible
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* ioinfo array. ioinfo will mutate into a subchannel device later.
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*
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* Reference: Documentation/s390/driver-model.txt */
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struct ccw_device {
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spinlock_t *ccwlock;
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struct ccw_device_private *private; /* cio private information */
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struct ccw_device_id id; /* id of this device, driver_info is
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set by ccw_find_driver */
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struct ccw_driver *drv; /* */
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struct device dev; /* */
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int online;
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/* This is sick, but a driver can have different interrupt handlers
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for different ccw_devices (multi-subchannel drivers)... */
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void (*handler) (struct ccw_device *, unsigned long, struct irb *);
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};
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/* Each ccw driver registers with the ccw root bus */
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struct ccw_driver {
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struct module *owner; /* for automatic MOD_INC_USE_COUNT */
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struct ccw_device_id *ids; /* probe driver with these devs */
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int (*probe) (struct ccw_device *); /* ask driver to probe dev */
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void (*remove) (struct ccw_device *);
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/* device is no longer available */
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int (*set_online) (struct ccw_device *);
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int (*set_offline) (struct ccw_device *);
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int (*notify) (struct ccw_device *, int);
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struct device_driver driver; /* higher level structure, don't init
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this from your driver */
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char *name;
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};
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extern struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
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const char *bus_id);
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/* devices drivers call these during module load and unload.
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* When a driver is registered, its probe method is called
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* when new devices for its type pop up */
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extern int ccw_driver_register (struct ccw_driver *driver);
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extern void ccw_driver_unregister (struct ccw_driver *driver);
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struct ccw1;
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extern int ccw_device_set_options(struct ccw_device *, unsigned long);
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/* Allow for i/o completion notification after primary interrupt status. */
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#define CCWDEV_EARLY_NOTIFICATION 0x0001
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/* Report all interrupt conditions. */
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#define CCWDEV_REPORT_ALL 0x0002
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/* Try to perform path grouping. */
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#define CCWDEV_DO_PATHGROUP 0x0004
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/* Allow forced onlining of boxed devices. */
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#define CCWDEV_ALLOW_FORCE 0x0008
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/*
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* ccw_device_start()
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*
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* Start a S/390 channel program. When the interrupt arrives, the
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* IRQ handler is called, either immediately, delayed (dev-end missing,
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* or sense required) or never (no IRQ handler registered).
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* Depending on the action taken, ccw_device_start() returns:
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* 0 - Success
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* -EBUSY - Device busy, or status pending
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* -ENODEV - Device not operational
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* -EINVAL - Device invalid for operation
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*/
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extern int ccw_device_start(struct ccw_device *, struct ccw1 *,
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unsigned long, __u8, unsigned long);
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/*
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* ccw_device_start_timeout()
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*
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* This function notifies the device driver if the channel program has not
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* completed during the specified time. If a timeout occurs, the channel
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* program is terminated via xsch(), hsch() or csch().
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*/
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extern int ccw_device_start_timeout(struct ccw_device *, struct ccw1 *,
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unsigned long, __u8, unsigned long, int);
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/*
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* ccw_device_start_key()
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* ccw_device_start_key_timeout()
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*
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* Same as ccw_device_start() and ccw_device_start_timeout(), except a
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* storage key != default key can be provided for the I/O.
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*/
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extern int ccw_device_start_key(struct ccw_device *, struct ccw1 *,
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unsigned long, __u8, __u8, unsigned long);
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extern int ccw_device_start_timeout_key(struct ccw_device *, struct ccw1 *,
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unsigned long, __u8, __u8,
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unsigned long, int);
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extern int ccw_device_resume(struct ccw_device *);
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extern int ccw_device_halt(struct ccw_device *, unsigned long);
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extern int ccw_device_clear(struct ccw_device *, unsigned long);
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extern int read_dev_chars(struct ccw_device *cdev, void **buffer, int length);
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extern int read_conf_data(struct ccw_device *cdev, void **buffer, int *length);
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extern int read_conf_data_lpm(struct ccw_device *cdev, void **buffer,
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int *length, __u8 lpm);
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extern int ccw_device_set_online(struct ccw_device *cdev);
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extern int ccw_device_set_offline(struct ccw_device *cdev);
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extern struct ciw *ccw_device_get_ciw(struct ccw_device *, __u32 cmd);
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extern __u8 ccw_device_get_path_mask(struct ccw_device *);
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#define get_ccwdev_lock(x) (x)->ccwlock
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#define to_ccwdev(n) container_of(n, struct ccw_device, dev)
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#define to_ccwdrv(n) container_of(n, struct ccw_driver, driver)
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extern struct ccw_device *ccw_device_probe_console(void);
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// FIXME: these have to go
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extern int _ccw_device_get_device_number(struct ccw_device *);
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extern int _ccw_device_get_subchannel_number(struct ccw_device *);
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extern void *ccw_device_get_chp_desc(struct ccw_device *, int);
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#endif /* _S390_CCWDEV_H_ */
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