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_probe_console(void); 223 extern void ccw_device_wait_idle(struct ccw_device *); 224 extern int ccw_device_force_console(struct ccw_device *); 225 226 int ccw_device_siosl(struct ccw_device *); 227 228 extern void ccw_device_get_schid(struct ccw_device *, struct subchannel_id *); 229 230 extern void *ccw_device_get_chp_desc(struct ccw_device *, int); 231 #endif /* _S390_CCWDEV_H_ */ 232