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
  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 0;
  67 }
  68
  69 /* The struct ccw device is our replacement for the globally accessible
  70  * ioinfo array. ioinfo will mutate into a subchannel device later.
  71  *
  72  * Reference: Documentation/s390/driver-model.txt */
  73 struct ccw_device {
  74         spinlock_t *ccwlock;
  75         struct ccw_device_private *private;     /* cio private information */
  76         struct ccw_device_id id;        /* id of this device, driver_info is
  77                                            set by ccw_find_driver */
  78         struct ccw_driver *drv;         /* */
  79         struct device dev;              /* */
  80         int online;
  81         /* This is sick, but a driver can have different interrupt handlers
  82            for different ccw_devices (multi-subchannel drivers)... */
  83         void (*handler) (struct ccw_device *, unsigned long, struct irb *);
  84 };
  85
  86
  87 /* Each ccw driver registers with the ccw root bus */
  88 struct ccw_driver {
  89         struct module *owner;           /* for automatic MOD_INC_USE_COUNT   */
  90         struct ccw_device_id *ids;      /* probe driver with these devs      */
  91         int (*probe) (struct ccw_device *); /* ask driver to probe dev       */
  92         void (*remove) (struct ccw_device *);
  93                                         /* device is no longer available     */
  94         int (*set_online) (struct ccw_device *);
  95         int (*set_offline) (struct ccw_device *);
  96         int (*notify) (struct ccw_device *, int);
  97         struct device_driver driver;    /* higher level structure, don't init
  98                                            this from your driver             */
  99         char *name;
 100 };
 101
 102 extern struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
 103                                               const char *bus_id);
 104
 105 /* devices drivers call these during module load and unload.
 106  * When a driver is registered, its probe method is called
 107  * when new devices for its type pop up */
 108 extern int  ccw_driver_register   (struct ccw_driver *driver);
 109 extern void ccw_driver_unregister (struct ccw_driver *driver);
 110
 111 struct ccw1;
 112
 113 extern int ccw_device_set_options(struct ccw_device *, unsigned long);
 114
 115 /* Allow for i/o completion notification after primary interrupt status. */
 116 #define CCWDEV_EARLY_NOTIFICATION       0x0001
 117 /* Report all interrupt conditions. */
 118 #define CCWDEV_REPORT_ALL               0x0002
 119 /* Try to perform path grouping. */
 120 #define CCWDEV_DO_PATHGROUP             0x0004
 121 /* Allow forced onlining of boxed devices. */
 122 #define CCWDEV_ALLOW_FORCE              0x0008
 123
 124 /*
 125  * ccw_device_start()
 126  *
 127  *  Start a S/390 channel program. When the interrupt arrives, the
 128  *  IRQ handler is called, either immediately, delayed (dev-end missing,
 129  *  or sense required) or never (no IRQ handler registered).
 130  *  Depending on the action taken, ccw_device_start() returns:
 131  *                           0       - Success
 132  *                           -EBUSY  - Device busy, or status pending
 133  *                           -ENODEV - Device not operational
 134  *                           -EINVAL - Device invalid for operation
 135  */
 136 extern int ccw_device_start(struct ccw_device *, struct ccw1 *,
 137                             unsigned long, __u8, unsigned long);
 138 /*
 139  * ccw_device_start_timeout()
 140  *
 141  * This function notifies the device driver if the channel program has not
 142  * completed during the specified time. If a timeout occurs, the channel
 143  * program is terminated via xsch(), hsch() or csch().
 144  */
 145 extern int ccw_device_start_timeout(struct ccw_device *, struct ccw1 *,
 146                                     unsigned long, __u8, unsigned long, int);
 147
 148 extern int ccw_device_resume(struct ccw_device *);
 149 extern int ccw_device_halt(struct ccw_device *, unsigned long);
 150 extern int ccw_device_clear(struct ccw_device *, unsigned long);
 151
 152 extern int read_dev_chars(struct ccw_device *cdev, void **buffer, int length);
 153 extern int read_conf_data(struct ccw_device *cdev, void **buffer, int *length);
 154
 155 extern int ccw_device_set_online(struct ccw_device *cdev);
 156 extern int ccw_device_set_offline(struct ccw_device *cdev);
 157
 158
 159 extern struct ciw *ccw_device_get_ciw(struct ccw_device *, __u32 cmd);
 160 extern __u8 ccw_device_get_path_mask(struct ccw_device *);
 161
 162 #define get_ccwdev_lock(x) (x)->ccwlock
 163
 164 #define to_ccwdev(n) container_of(n, struct ccw_device, dev)
 165 #define to_ccwdrv(n) container_of(n, struct ccw_driver, driver)
 166
 167 extern struct ccw_device *ccw_device_probe_console(void);
 168
 169 // FIXME: these have to go
 170 extern int _ccw_device_get_device_number(struct ccw_device *);
 171 extern int _ccw_device_get_subchannel_number(struct ccw_device *);
 172
 173 extern struct device *s390_root_dev_register(const char *);
 174 extern void s390_root_dev_unregister(struct device *);
 175
 176 #endif /* _S390_CCWDEV_H_ */