/* 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 /chsc.h>
#include <asm /fcx.h>
#include <asm /irq.h>
#include <asm /schid.h>
#include <linux/mutex.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 */
struct mutex reg_mutex;
/* 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 0 x0
#define PE_PATH_GONE 0 x1 /* A path is no longer available. */
#define PE_PATH_AVAILABLE 0 x2 /* A path has become available and
was successfully verified. */
#define PE_PATHGROUP_ESTABLISHED 0 x4 /* A pathgroup was reset and had
to be established again. */
#define PE_PATH_FCES_EVENT 0 x8 /* The FCES Status of a path has
* changed. */
/*
* 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
* @ 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 *);
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);
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 0 x0001
/* Report all interrupt conditions. */
#define CCWDEV_REPORT_ALL 0 x0002
/* Try to perform path grouping. */
#define CCWDEV_DO_PATHGROUP 0 x0004
/* Allow forced onlining of boxed devices. */
#define CCWDEV_ALLOW_FORCE 0 x0008
/* Try to use multipath mode. */
#define CCWDEV_DO_MULTIPATH 0 x0010
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_const(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 void *ccw_device_dma_zalloc(struct ccw_device *cdev, size_t size,
dma32_t *dma_handle);
extern void ccw_device_dma_free(struct ccw_device *cdev,
void *cpu_addr, size_t size);
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 );
u8 *ccw_device_get_util_str(struct ccw_device *cdev, int chp_idx);
int ccw_device_pnso(struct ccw_device *cdev,
struct chsc_pnso_area *pnso_area, u8 oc,
struct chsc_pnso_resume_token resume_token, int cnc);
int ccw_device_get_cssid(struct ccw_device *cdev, u8 *cssid);
int ccw_device_get_iid(struct ccw_device *cdev, u8 *iid);
int ccw_device_get_chpid(struct ccw_device *cdev, int chp_idx, u8 *chpid);
int ccw_device_get_chid(struct ccw_device *cdev, int chp_idx, u16 *chid);
#endif /* _S390_CCWDEV_H_ */
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