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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright IBM Corp. 2002, 2009
*
* Author(s): Arnd Bergmann <arndb@de.ibm.com>
*
* Interface for CCW device drivers
*/
#ifndef _S390_CCWDEV_H_
#define _S390_CCWDEV_H_
#include <linux/device.h>
#include <linux/mod_devicetable.h>
#include <asm/fcx.h>
#include <asm/irq.h>
#include <asm/schid.h>
/* structs from asm/cio.h */
struct irb;
struct ccw1;
struct ccw_dev_id;
/* 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), \
.match_flags=(CCW_DEVICE_ID_MATCH_CU_TYPE \
| (cum ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0))
#define CCW_DEVICE_DEVTYPE(cu, cum, dev, devm) \
.cu_type=(cu), .cu_model=(cum), .dev_type=(dev), .dev_model=(devm),\
.match_flags=CCW_DEVICE_ID_MATCH_CU_TYPE \
| ((cum) ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0) \
| CCW_DEVICE_ID_MATCH_DEVICE_TYPE \
| ((devm) ? CCW_DEVICE_ID_MATCH_DEVICE_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))
continue;
if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_MODEL)
&& (id->cu_model != match->cu_model))
continue;
if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_TYPE)
&& (id->dev_type != match->dev_type))
continue;
if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_MODEL)
&& (id->dev_model != match->dev_model))
continue;
return id;
}
return NULL;
}
/**
* struct ccw_device - channel attached device
* @ccwlock: pointer to device lock
* @id: id of this device
* @drv: ccw driver for this device
* @dev: embedded device structure
* @online: online status of device
* @handler: interrupt handler
*
* @handler is a member of the device rather than the driver since a driver
* can have different interrupt handlers for different ccw devices
* (multi-subchannel drivers).
*/
struct ccw_device {
spinlock_t *ccwlock;
/* private: */
struct ccw_device_private *private; /* cio private information */
/* public: */
struct ccw_device_id id;
struct ccw_driver *drv;
struct device dev;
int online;
void (*handler) (struct ccw_device *, unsigned long, struct irb *);
};
/*
* Possible events used by the path_event notifier.
*/
#define PE_NONE 0x0
#define PE_PATH_GONE 0x1 /* A path is no longer available. */
#define PE_PATH_AVAILABLE 0x2 /* A path has become available and
was successfully verified. */
#define PE_PATHGROUP_ESTABLISHED 0x4 /* A pathgroup was reset and had
to be established again. */
/*
* Possible CIO actions triggered by the unit check handler.
*/
enum uc_todo {
UC_TODO_RETRY,
UC_TODO_RETRY_ON_NEW_PATH,
UC_TODO_STOP
};
/**
* struct ccw driver - device driver for channel attached devices
* @ids: ids supported by this driver
* @probe: function called on probe
* @remove: function called on remove
* @set_online: called when setting device online
* @set_offline: called when setting device offline
* @notify: notify driver of device state changes
* @path_event: notify driver of channel path events
* @shutdown: called at device shutdown
* @prepare: prepare for pm state transition
* @complete: undo work done in @prepare
* @freeze: callback for freezing during hibernation snapshotting
* @thaw: undo work done in @freeze
* @restore: callback for restoring after hibernation
* @uc_handler: callback for unit check handler
* @driver: embedded device driver structure
* @int_class: interruption class to use for accounting interrupts
*/
struct ccw_driver {
struct ccw_device_id *ids;
int (*probe) (struct ccw_device *);
void (*remove) (struct ccw_device *);
int (*set_online) (struct ccw_device *);
int (*set_offline) (struct ccw_device *);
int (*notify) (struct ccw_device *, int);
void (*path_event) (struct ccw_device *, int *);
void (*shutdown) (struct ccw_device *);
int (*prepare) (struct ccw_device *);
void (*complete) (struct ccw_device *);
int (*freeze)(struct ccw_device *);
int (*thaw) (struct ccw_device *);
int (*restore)(struct ccw_device *);
enum uc_todo (*uc_handler) (struct ccw_device *, struct irb *);
struct device_driver driver;
enum interruption_class int_class;
};
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_mask(struct ccw_device *, unsigned long);
extern int ccw_device_set_options(struct ccw_device *, unsigned long);
extern void ccw_device_clear_options(struct ccw_device *, unsigned long);
int ccw_device_is_pathgroup(struct ccw_device *cdev);
int ccw_device_is_multipath(struct ccw_device *cdev);
/* Allow for i/o completion notification after primary interrupt status. */
#define CCWDEV_EARLY_NOTIFICATION 0x0001
/* 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
/* Try to use multipath mode. */
#define CCWDEV_DO_MULTIPATH 0x0010
extern int ccw_device_start(struct ccw_device *, struct ccw1 *,
unsigned long, __u8, unsigned long);
extern int ccw_device_start_timeout(struct ccw_device *, struct ccw1 *,
unsigned long, __u8, unsigned long, int);
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);
int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw,
unsigned long intparm, u8 lpm, u8 key);
int ccw_device_tm_start_key(struct ccw_device *, struct tcw *,
unsigned long, u8, u8);
int ccw_device_tm_start_timeout_key(struct ccw_device *, struct tcw *,
unsigned long, u8, u8, int);
int ccw_device_tm_start(struct ccw_device *, struct tcw *,
unsigned long, u8);
int ccw_device_tm_start_timeout(struct ccw_device *, struct tcw *,
unsigned long, u8, int);
int ccw_device_tm_intrg(struct ccw_device *cdev);
int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask);
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 *);
extern void ccw_device_get_id(struct ccw_device *, struct ccw_dev_id *);
#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_create_console(struct ccw_driver *);
extern void ccw_device_destroy_console(struct ccw_device *);
extern int ccw_device_enable_console(struct ccw_device *);
extern void ccw_device_wait_idle(struct ccw_device *);
extern int ccw_device_force_console(struct ccw_device *);
int ccw_device_siosl(struct ccw_device *);
extern void ccw_device_get_schid(struct ccw_device *, struct subchannel_id *);
struct channel_path_desc_fmt0 *ccw_device_get_chp_desc(struct ccw_device *, int);
#endif /* _S390_CCWDEV_H_ */
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