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 #include <asm/irq.h>
  15 #include <asm/schid.h>
  16
  17 /* structs from asm/cio.h */
  18 struct irb;
  19 struct ccw1;
  20 struct ccw_dev_id;
  21
  22 /* simplified initializers for struct ccw_device:
  23  * CCW_DEVICE and CCW_DEVICE_DEVTYPE initialize one
  24  * entry in your MODULE_DEVICE_TABLE and set the match_flag correctly */
  25 #define CCW_DEVICE(cu, cum)                                             \
  26         .cu_type=(cu), .cu_model=(cum),                                 \
  27         .match_flags=(CCW_DEVICE_ID_MATCH_CU_TYPE                       \
  28                    | (cum ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0))
  29
  30 #define CCW_DEVICE_DEVTYPE(cu, cum, dev, devm)                          \
  31         .cu_type=(cu), .cu_model=(cum), .dev_type=(dev), .dev_model=(devm),\
  32         .match_flags=CCW_DEVICE_ID_MATCH_CU_TYPE                        \
  33                    | ((cum) ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0)         \
  34                    | CCW_DEVICE_ID_MATCH_DEVICE_TYPE                    \
  35                    | ((devm) ? CCW_DEVICE_ID_MATCH_DEVICE_MODEL : 0)
  36
  37 /* scan through an array of device ids and return the first
  38  * entry that matches the device.
  39  *
  40  * the array must end with an entry containing zero match_flags
  41  */
  42 static inline const struct ccw_device_id *
  43 ccw_device_id_match(const struct ccw_device_id *array,
  44                         const struct ccw_device_id *match)
  45 {
  46         const struct ccw_device_id *id = array;
  47
  48         for (id = array; id->match_flags; id++) {
  49                 if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_TYPE)
  50                     && (id->cu_type != match->cu_type))
  51                         continue;
  52
  53                 if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_MODEL)
  54                     && (id->cu_model != match->cu_model))
  55                         continue;
  56
  57                 if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_TYPE)
  58                     && (id->dev_type != match->dev_type))
  59                         continue;
  60
  61                 if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_MODEL)
  62                     && (id->dev_model != match->dev_model))
  63                         continue;
  64
  65                 return id;
  66         }
  67
  68         return NULL;
  69 }
  70
  71 /**
  72  * struct ccw_device - channel attached device
  73  * @ccwlock: pointer to device lock
  74  * @id: id of this device
  75  * @drv: ccw driver for this device
  76  * @dev: embedded device structure
  77  * @online: online status of device
  78  * @handler: interrupt handler
  79  *
  80  * @handler is a member of the device rather than the driver since a driver
  81  * can have different interrupt handlers for different ccw devices
  82  * (multi-subchannel drivers).
  83  */
  84 struct ccw_device {
  85         spinlock_t *ccwlock;
  86 /* private: */
  87         struct ccw_device_private *private;     /* cio private information */
  88 /* public: */
  89         struct ccw_device_id id;
  90         struct ccw_driver *drv;
  91         struct device dev;
  92         int online;
  93         void (*handler) (struct ccw_device *, unsigned long, struct irb *);
  94 };
  95
  96 /*
  97  * Possible events used by the path_event notifier.
  98  */
  99 #define PE_NONE                         0x0
 100 #define PE_PATH_GONE                    0x1 /* A path is no longer available. */
 101 #define PE_PATH_AVAILABLE               0x2 /* A path has become available and
 102                                                was successfully verified. */
 103 #define PE_PATHGROUP_ESTABLISHED        0x4 /* A pathgroup was reset and had
 104                                                to be established again. */
 105
 106 /*
 107  * Possible CIO actions triggered by the unit check handler.
 108  */
 109 enum uc_todo {
 110         UC_TODO_RETRY,
 111         UC_TODO_RETRY_ON_NEW_PATH,
 112         UC_TODO_STOP
 113 };
 114
 115 /**
 116  * struct ccw driver - device driver for channel attached devices
 117  * @ids: ids supported by this driver
 118  * @probe: function called on probe
 119  * @remove: function called on remove
 120  * @set_online: called when setting device online
 121  * @set_offline: called when setting device offline
 122  * @notify: notify driver of device state changes
 123  * @path_event: notify driver of channel path events
 124  * @shutdown: called at device shutdown
 125  * @prepare: prepare for pm state transition
 126  * @complete: undo work done in @prepare
 127  * @freeze: callback for freezing during hibernation snapshotting
 128  * @thaw: undo work done in @freeze
 129  * @restore: callback for restoring after hibernation
 130  * @uc_handler: callback for unit check handler
 131  * @driver: embedded device driver structure
 132  * @int_class: interruption class to use for accounting interrupts
 133  */
 134 struct ccw_driver {
 135         struct ccw_device_id *ids;
 136         int (*probe) (struct ccw_device *);
 137         void (*remove) (struct ccw_device *);
 138         int (*set_online) (struct ccw_device *);
 139         int (*set_offline) (struct ccw_device *);
 140         int (*notify) (struct ccw_device *, int);
 141         void (*path_event) (struct ccw_device *, int *);
 142         void (*shutdown) (struct ccw_device *);
 143         int (*prepare) (struct ccw_device *);
 144         void (*complete) (struct ccw_device *);
 145         int (*freeze)(struct ccw_device *);
 146         int (*thaw) (struct ccw_device *);
 147         int (*restore)(struct ccw_device *);
 148         enum uc_todo (*uc_handler) (struct ccw_device *, struct irb *);
 149         struct device_driver driver;
 150         enum interruption_class int_class;
 151 };
 152
 153 extern struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
 154                                               const char *bus_id);
 155
 156 /* devices drivers call these during module load and unload.
 157  * When a driver is registered, its probe method is called
 158  * when new devices for its type pop up */
 159 extern int  ccw_driver_register   (struct ccw_driver *driver);
 160 extern void ccw_driver_unregister (struct ccw_driver *driver);
 161
 162 struct ccw1;
 163
 164 extern int ccw_device_set_options_mask(struct ccw_device *, unsigned long);
 165 extern int ccw_device_set_options(struct ccw_device *, unsigned long);
 166 extern void ccw_device_clear_options(struct ccw_device *, unsigned long);
 167 int ccw_device_is_pathgroup(struct ccw_device *cdev);
 168 int ccw_device_is_multipath(struct ccw_device *cdev);
 169
 170 /* Allow for i/o completion notification after primary interrupt status. */
 171 #define CCWDEV_EARLY_NOTIFICATION       0x0001
 172 /* Report all interrupt conditions. */
 173 #define CCWDEV_REPORT_ALL               0x0002
 174 /* Try to perform path grouping. */
 175 #define CCWDEV_DO_PATHGROUP             0x0004
 176 /* Allow forced onlining of boxed devices. */
 177 #define CCWDEV_ALLOW_FORCE              0x0008
 178 /* Try to use multipath mode. */
 179 #define CCWDEV_DO_MULTIPATH             0x0010
 180
 181 extern int ccw_device_start(struct ccw_device *, struct ccw1 *,
 182                             unsigned long, __u8, unsigned long);
 183 extern int ccw_device_start_timeout(struct ccw_device *, struct ccw1 *,
 184                                     unsigned long, __u8, unsigned long, int);
 185 extern int ccw_device_start_key(struct ccw_device *, struct ccw1 *,
 186                                 unsigned long, __u8, __u8, unsigned long);
 187 extern int ccw_device_start_timeout_key(struct ccw_device *, struct ccw1 *,
 188                                         unsigned long, __u8, __u8,
 189                                         unsigned long, int);
 190
 191
 192 extern int ccw_device_resume(struct ccw_device *);
 193 extern int ccw_device_halt(struct ccw_device *, unsigned long);
 194 extern int ccw_device_clear(struct ccw_device *, unsigned long);
 195 int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw,
 196                             unsigned long intparm, u8 lpm, u8 key);
 197 int ccw_device_tm_start_key(struct ccw_device *, struct tcw *,
 198                             unsigned long, u8, u8);
 199 int ccw_device_tm_start_timeout_key(struct ccw_device *, struct tcw *,
 200                             unsigned long, u8, u8, int);
 201 int ccw_device_tm_start(struct ccw_device *, struct tcw *,
 202                             unsigned long, u8);
 203 int ccw_device_tm_start_timeout(struct ccw_device *, struct tcw *,
 204                             unsigned long, u8, int);
 205 int ccw_device_tm_intrg(struct ccw_device *cdev);
 206
 207 int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask);
 208
 209 extern int ccw_device_set_online(struct ccw_device *cdev);
 210 extern int ccw_device_set_offline(struct ccw_device *cdev);
 211
 212
 213 extern struct ciw *ccw_device_get_ciw(struct ccw_device *, __u32 cmd);
 214 extern __u8 ccw_device_get_path_mask(struct ccw_device *);
 215 extern void ccw_device_get_id(struct ccw_device *, struct ccw_dev_id *);
 216
 217 #define get_ccwdev_lock(x) (x)->ccwlock
 218
 219 #define to_ccwdev(n) container_of(n, struct ccw_device, dev)
 220 #define to_ccwdrv(n) container_of(n, struct ccw_driver, driver)
 221
 222 extern struct ccw_device *ccw_device_create_console(struct ccw_driver *);
 223 extern void ccw_device_destroy_console(struct ccw_device *);
 224 extern int ccw_device_enable_console(struct ccw_device *);
 225 extern void ccw_device_wait_idle(struct ccw_device *);
 226 extern int ccw_device_force_console(struct ccw_device *);
 227
 228 int ccw_device_siosl(struct ccw_device *);
 229
 230 extern void ccw_device_get_schid(struct ccw_device *, struct subchannel_id *);
 231
 232 struct channel_path_desc *ccw_device_get_chp_desc(struct ccw_device *, int);
 233 #endif /* _S390_CCWDEV_H_ */