include/asm-s390/ccwdev.h

   1 /*
   2  *  include/asm-s390/ccwdev.h
   3  *  include/asm-s390x/ccwdev.h
   4  *
   5  *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *    Author(s): Arnd Bergmann <arndb@de.ibm.com>
   7  *
   8  *  Interface for CCW device drivers
   9  */
  10 #ifndef _S390_CCWDEV_H_
  11 #define _S390_CCWDEV_H_
  12
  13 #include <linux/device.h>
  14 #include <linux/mod_devicetable.h>
  15
  16 /* structs from asm/cio.h */
  17 struct irb;
  18 struct ccw1;
  19 struct ccw_dev_id;
  20
  21 /* simplified initializers for struct ccw_device:
  22  * CCW_DEVICE and CCW_DEVICE_DEVTYPE initialize one
  23  * entry in your MODULE_DEVICE_TABLE and set the match_flag correctly */
  24 #define CCW_DEVICE(cu, cum)                                             \
  25         .cu_type=(cu), .cu_model=(cum),                                 \
  26         .match_flags=(CCW_DEVICE_ID_MATCH_CU_TYPE                       \
  27                    | (cum ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0))
  28
  29 #define CCW_DEVICE_DEVTYPE(cu, cum, dev, devm)                          \
  30         .cu_type=(cu), .cu_model=(cum), .dev_type=(dev), .dev_model=(devm),\
  31         .match_flags=CCW_DEVICE_ID_MATCH_CU_TYPE                        \
  32                    | ((cum) ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0)         \
  33                    | CCW_DEVICE_ID_MATCH_DEVICE_TYPE                    \
  34                    | ((devm) ? CCW_DEVICE_ID_MATCH_DEVICE_MODEL : 0)
  35
  36 /* scan through an array of device ids and return the first
  37  * entry that matches the device.
  38  *
  39  * the array must end with an entry containing zero match_flags
  40  */
  41 static inline const struct ccw_device_id *
  42 ccw_device_id_match(const struct ccw_device_id *array,
  43                         const struct ccw_device_id *match)
  44 {
  45         const struct ccw_device_id *id = array;
  46
  47         for (id = array; id->match_flags; id++) {
  48                 if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_TYPE)
  49                     && (id->cu_type != match->cu_type))
  50                         continue;
  51
  52                 if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_MODEL)
  53                     && (id->cu_model != match->cu_model))
  54                         continue;
  55
  56                 if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_TYPE)
  57                     && (id->dev_type != match->dev_type))
  58                         continue;
  59
  60                 if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_MODEL)
  61                     && (id->dev_model != match->dev_model))
  62                         continue;
  63
  64                 return id;
  65         }
  66
  67         return NULL;
  68 }
  69
  70 /* The struct ccw device is our replacement for the globally accessible
  71  * ioinfo array. ioinfo will mutate into a subchannel device later.
  72  *
  73  * Reference: Documentation/s390/driver-model.txt */
  74 struct ccw_device {
  75         spinlock_t *ccwlock;
  76         struct ccw_device_private *private;     /* cio private information */
  77         struct ccw_device_id id;        /* id of this device, driver_info is
  78                                            set by ccw_find_driver */
  79         struct ccw_driver *drv;         /* */
  80         struct device dev;              /* */
  81         int online;
  82         /* This is sick, but a driver can have different interrupt handlers
  83            for different ccw_devices (multi-subchannel drivers)... */
  84         void (*handler) (struct ccw_device *, unsigned long, struct irb *);
  85 };
  86
  87
  88 /* Each ccw driver registers with the ccw root bus */
  89 struct ccw_driver {
  90         struct module *owner;           /* for automatic MOD_INC_USE_COUNT   */
  91         struct ccw_device_id *ids;      /* probe driver with these devs      */
  92         int (*probe) (struct ccw_device *); /* ask driver to probe dev       */
  93         void (*remove) (struct ccw_device *);
  94                                         /* device is no longer available     */
  95         int (*set_online) (struct ccw_device *);
  96         int (*set_offline) (struct ccw_device *);
  97         int (*notify) (struct ccw_device *, int);
  98         struct device_driver driver;    /* higher level structure, don't init
  99                                            this from your driver             */
 100         char *name;
 101 };
 102
 103 extern struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
 104                                               const char *bus_id);
 105
 106 /* devices drivers call these during module load and unload.
 107  * When a driver is registered, its probe method is called
 108  * when new devices for its type pop up */
 109 extern int  ccw_driver_register   (struct ccw_driver *driver);
 110 extern void ccw_driver_unregister (struct ccw_driver *driver);
 111
 112 struct ccw1;
 113
 114 extern int ccw_device_set_options_mask(struct ccw_device *, unsigned long);
 115 extern int ccw_device_set_options(struct ccw_device *, unsigned long);
 116 extern void ccw_device_clear_options(struct ccw_device *, unsigned long);
 117
 118 /* Allow for i/o completion notification after primary interrupt status. */
 119 #define CCWDEV_EARLY_NOTIFICATION       0x0001
 120 /* Report all interrupt conditions. */
 121 #define CCWDEV_REPORT_ALL               0x0002
 122 /* Try to perform path grouping. */
 123 #define CCWDEV_DO_PATHGROUP             0x0004
 124 /* Allow forced onlining of boxed devices. */
 125 #define CCWDEV_ALLOW_FORCE              0x0008
 126
 127 /*
 128  * ccw_device_start()
 129  *
 130  *  Start a S/390 channel program. When the interrupt arrives, the
 131  *  IRQ handler is called, either immediately, delayed (dev-end missing,
 132  *  or sense required) or never (no IRQ handler registered).
 133  *  Depending on the action taken, ccw_device_start() returns:
 134  *                           0       - Success
 135  *                           -EBUSY  - Device busy, or status pending
 136  *                           -ENODEV - Device not operational
 137  *                           -EINVAL - Device invalid for operation
 138  */
 139 extern int ccw_device_start(struct ccw_device *, struct ccw1 *,
 140                             unsigned long, __u8, unsigned long);
 141 /*
 142  * ccw_device_start_timeout()
 143  *
 144  * This function notifies the device driver if the channel program has not
 145  * completed during the specified time. If a timeout occurs, the channel
 146  * program is terminated via xsch(), hsch() or csch().
 147  */
 148 extern int ccw_device_start_timeout(struct ccw_device *, struct ccw1 *,
 149                                     unsigned long, __u8, unsigned long, int);
 150 /*
 151  * ccw_device_start_key()
 152  * ccw_device_start_key_timeout()
 153  *
 154  * Same as ccw_device_start() and ccw_device_start_timeout(), except a
 155  * storage key != default key can be provided for the I/O.
 156  */
 157 extern int ccw_device_start_key(struct ccw_device *, struct ccw1 *,
 158                                 unsigned long, __u8, __u8, unsigned long);
 159 extern int ccw_device_start_timeout_key(struct ccw_device *, struct ccw1 *,
 160                                         unsigned long, __u8, __u8,
 161                                         unsigned long, int);
 162
 163
 164 extern int ccw_device_resume(struct ccw_device *);
 165 extern int ccw_device_halt(struct ccw_device *, unsigned long);
 166 extern int ccw_device_clear(struct ccw_device *, unsigned long);
 167
 168 extern int ccw_device_set_online(struct ccw_device *cdev);
 169 extern int ccw_device_set_offline(struct ccw_device *cdev);
 170
 171
 172 extern struct ciw *ccw_device_get_ciw(struct ccw_device *, __u32 cmd);
 173 extern __u8 ccw_device_get_path_mask(struct ccw_device *);
 174 extern void ccw_device_get_id(struct ccw_device *, struct ccw_dev_id *);
 175
 176 #define get_ccwdev_lock(x) (x)->ccwlock
 177
 178 #define to_ccwdev(n) container_of(n, struct ccw_device, dev)
 179 #define to_ccwdrv(n) container_of(n, struct ccw_driver, driver)
 180
 181 extern struct ccw_device *ccw_device_probe_console(void);
 182
 183 // FIXME: these have to go
 184 extern int _ccw_device_get_subchannel_number(struct ccw_device *);
 185
 186 extern void *ccw_device_get_chp_desc(struct ccw_device *, int);
 187 #endif /* _S390_CCWDEV_H_ */