arch/s390/include/asm/ccwdev.h

   1 /*
   2  * Copyright  IBM Corp. 2002, 2009
   3  *
   4  * Author(s): Arnd Bergmann <arndb@de.ibm.com>
   5  *
   6  * Interface for CCW device drivers
   7  */
   8 #ifndef _S390_CCWDEV_H_
   9 #define _S390_CCWDEV_H_
  10
  11 #include <linux/device.h>
  12 #include <linux/mod_devicetable.h>
  13 #include <asm/fcx.h>
  14
  15 /* structs from asm/cio.h */
  16 struct irb;
  17 struct ccw1;
  18 struct ccw_dev_id;
  19
  20 /* simplified initializers for struct ccw_device:
  21  * CCW_DEVICE and CCW_DEVICE_DEVTYPE initialize one
  22  * entry in your MODULE_DEVICE_TABLE and set the match_flag correctly */
  23 #define CCW_DEVICE(cu, cum)                                             \
  24         .cu_type=(cu), .cu_model=(cum),                                 \
  25         .match_flags=(CCW_DEVICE_ID_MATCH_CU_TYPE                       \
  26                    | (cum ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0))
  27
  28 #define CCW_DEVICE_DEVTYPE(cu, cum, dev, devm)                          \
  29         .cu_type=(cu), .cu_model=(cum), .dev_type=(dev), .dev_model=(devm),\
  30         .match_flags=CCW_DEVICE_ID_MATCH_CU_TYPE                        \
  31                    | ((cum) ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0)         \
  32                    | CCW_DEVICE_ID_MATCH_DEVICE_TYPE                    \
  33                    | ((devm) ? CCW_DEVICE_ID_MATCH_DEVICE_MODEL : 0)
  34
  35 /* scan through an array of device ids and return the first
  36  * entry that matches the device.
  37  *
  38  * the array must end with an entry containing zero match_flags
  39  */
  40 static inline const struct ccw_device_id *
  41 ccw_device_id_match(const struct ccw_device_id *array,
  42                         const struct ccw_device_id *match)
  43 {
  44         const struct ccw_device_id *id = array;
  45
  46         for (id = array; id->match_flags; id++) {
  47                 if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_TYPE)
  48                     && (id->cu_type != match->cu_type))
  49                         continue;
  50
  51                 if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_MODEL)
  52                     && (id->cu_model != match->cu_model))
  53                         continue;
  54
  55                 if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_TYPE)
  56                     && (id->dev_type != match->dev_type))
  57                         continue;
  58
  59                 if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_MODEL)
  60                     && (id->dev_model != match->dev_model))
  61                         continue;
  62
  63                 return id;
  64         }
  65
  66         return NULL;
  67 }
  68
  69 /**
  70  * struct ccw_device - channel attached device
  71  * @ccwlock: pointer to device lock
  72  * @id: id of this device
  73  * @drv: ccw driver for this device
  74  * @dev: embedded device structure
  75  * @online: online status of device
  76  * @handler: interrupt handler
  77  *
  78  * @handler is a member of the device rather than the driver since a driver
  79  * can have different interrupt handlers for different ccw devices
  80  * (multi-subchannel drivers).
  81  */
  82 struct ccw_device {
  83         spinlock_t *ccwlock;
  84 /* private: */
  85         struct ccw_device_private *private;     /* cio private information */
  86 /* public: */
  87         struct ccw_device_id id;
  88         struct ccw_driver *drv;
  89         struct device dev;
  90         int online;
  91         void (*handler) (struct ccw_device *, unsigned long, struct irb *);
  92 };
  93
  94 /*
  95  * Possible events used by the path_event notifier.
  96  */
  97 #define PE_NONE                         0x0
  98 #define PE_PATH_GONE                    0x1 /* A path is no longer available. */
  99 #define PE_PATH_AVAILABLE               0x2 /* A path has become available and
 100                                                was successfully verified. */
 101 #define PE_PATHGROUP_ESTABLISHED        0x4 /* A pathgroup was reset and had
 102                                                to be established again. */
 103
 104 /*
 105  * Possible CIO actions triggered by the unit check handler.
 106  */
 107 enum uc_todo {
 108         UC_TODO_RETRY,
 109         UC_TODO_RETRY_ON_NEW_PATH,
 110         UC_TODO_STOP
 111 };
 112
 113 /**
 114  * struct ccw driver - device driver for channel attached devices
 115  * @ids: ids supported by this driver
 116  * @probe: function called on probe
 117  * @remove: function called on remove
 118  * @set_online: called when setting device online
 119  * @set_offline: called when setting device offline
 120  * @notify: notify driver of device state changes
 121  * @path_event: notify driver of channel path events
 122  * @shutdown: called at device shutdown
 123  * @prepare: prepare for pm state transition
 124  * @complete: undo work done in @prepare
 125  * @freeze: callback for freezing during hibernation snapshotting
 126  * @thaw: undo work done in @freeze
 127  * @restore: callback for restoring after hibernation
 128  * @uc_handler: callback for unit check handler
 129  * @driver: embedded device driver structure
 130  */
 131 struct ccw_driver {
 132         struct ccw_device_id *ids;
 133         int (*probe) (struct ccw_device *);
 134         void (*remove) (struct ccw_device *);
 135         int (*set_online) (struct ccw_device *);
 136         int (*set_offline) (struct ccw_device *);
 137         int (*notify) (struct ccw_device *, int);
 138         void (*path_event) (struct ccw_device *, int *);
 139         void (*shutdown) (struct ccw_device *);
 140         int (*prepare) (struct ccw_device *);
 141         void (*complete) (struct ccw_device *);
 142         int (*freeze)(struct ccw_device *);
 143         int (*thaw) (struct ccw_device *);
 144         int (*restore)(struct ccw_device *);
 145         enum uc_todo (*uc_handler) (struct ccw_device *, struct irb *);
 146         struct device_driver driver;
 147 };
 148
 149 extern struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
 150                                               const char *bus_id);
 151
 152 /* devices drivers call these during module load and unload.
 153  * When a driver is registered, its probe method is called
 154  * when new devices for its type pop up */
 155 extern int  ccw_driver_register   (struct ccw_driver *driver);
 156 extern void ccw_driver_unregister (struct ccw_driver *driver);
 157
 158 struct ccw1;
 159
 160 extern int ccw_device_set_options_mask(struct ccw_device *, unsigned long);
 161 extern int ccw_device_set_options(struct ccw_device *, unsigned long);
 162 extern void ccw_device_clear_options(struct ccw_device *, unsigned long);
 163 int ccw_device_is_pathgroup(struct ccw_device *cdev);
 164 int ccw_device_is_multipath(struct ccw_device *cdev);
 165
 166 /* Allow for i/o completion notification after primary interrupt status. */
 167 #define CCWDEV_EARLY_NOTIFICATION       0x0001
 168 /* Report all interrupt conditions. */
 169 #define CCWDEV_REPORT_ALL               0x0002
 170 /* Try to perform path grouping. */
 171 #define CCWDEV_DO_PATHGROUP             0x0004
 172 /* Allow forced onlining of boxed devices. */
 173 #define CCWDEV_ALLOW_FORCE              0x0008
 174 /* Try to use multipath mode. */
 175 #define CCWDEV_DO_MULTIPATH             0x0010
 176
 177 extern int ccw_device_start(struct ccw_device *, struct ccw1 *,
 178                             unsigned long, __u8, unsigned long);
 179 extern int ccw_device_start_timeout(struct ccw_device *, struct ccw1 *,
 180                                     unsigned long, __u8, unsigned long, int);
 181 extern int ccw_device_start_key(struct ccw_device *, struct ccw1 *,
 182                                 unsigned long, __u8, __u8, unsigned long);
 183 extern int ccw_device_start_timeout_key(struct ccw_device *, struct ccw1 *,
 184                                         unsigned long, __u8, __u8,
 185                                         unsigned long, int);
 186
 187
 188 extern int ccw_device_resume(struct ccw_device *);
 189 extern int ccw_device_halt(struct ccw_device *, unsigned long);
 190 extern int ccw_device_clear(struct ccw_device *, unsigned long);
 191 int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw,
 192                             unsigned long intparm, u8 lpm, u8 key);
 193 int ccw_device_tm_start_key(struct ccw_device *, struct tcw *,
 194                             unsigned long, u8, u8);
 195 int ccw_device_tm_start_timeout_key(struct ccw_device *, struct tcw *,
 196                             unsigned long, u8, u8, int);
 197 int ccw_device_tm_start(struct ccw_device *, struct tcw *,
 198                             unsigned long, u8);
 199 int ccw_device_tm_start_timeout(struct ccw_device *, struct tcw *,
 200                             unsigned long, u8, int);
 201 int ccw_device_tm_intrg(struct ccw_device *cdev);
 202
 203 int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask);
 204
 205 extern int ccw_device_set_online(struct ccw_device *cdev);
 206 extern int ccw_device_set_offline(struct ccw_device *cdev);
 207
 208
 209 extern struct ciw *ccw_device_get_ciw(struct ccw_device *, __u32 cmd);
 210 extern __u8 ccw_device_get_path_mask(struct ccw_device *);
 211 extern void ccw_device_get_id(struct ccw_device *, struct ccw_dev_id *);
 212
 213 #define get_ccwdev_lock(x) (x)->ccwlock
 214
 215 #define to_ccwdev(n) container_of(n, struct ccw_device, dev)
 216 #define to_ccwdrv(n) container_of(n, struct ccw_driver, driver)
 217
 218 extern struct ccw_device *ccw_device_probe_console(void);
 219 extern int ccw_device_force_console(void);
 220
 221 int ccw_device_siosl(struct ccw_device *);
 222
 223 // FIXME: these have to go
 224 extern int _ccw_device_get_subchannel_number(struct ccw_device *);
 225
 226 extern void *ccw_device_get_chp_desc(struct ccw_device *, int);
 227 #endif /* _S390_CCWDEV_H_ */