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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 */
16struct irb;
17struct ccw1;
18struct 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 */
40static inline const struct ccw_device_id *
41ccw_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 */
82struct 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 */
107enum 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 */
131struct 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
149extern 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 */
155extern int ccw_driver_register (struct ccw_driver *driver);
156extern void ccw_driver_unregister (struct ccw_driver *driver);
157
158struct ccw1;
159
160extern int ccw_device_set_options_mask(struct ccw_device *, unsigned long);
161extern int ccw_device_set_options(struct ccw_device *, unsigned long);
162extern void ccw_device_clear_options(struct ccw_device *, unsigned long);
163int ccw_device_is_pathgroup(struct ccw_device *cdev);
164int 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
177extern int ccw_device_start(struct ccw_device *, struct ccw1 *,
178 unsigned long, __u8, unsigned long);
179extern int ccw_device_start_timeout(struct ccw_device *, struct ccw1 *,
180 unsigned long, __u8, unsigned long, int);
181extern int ccw_device_start_key(struct ccw_device *, struct ccw1 *,
182 unsigned long, __u8, __u8, unsigned long);
183extern int ccw_device_start_timeout_key(struct ccw_device *, struct ccw1 *,
184 unsigned long, __u8, __u8,
185 unsigned long, int);
186
187
188extern int ccw_device_resume(struct ccw_device *);
189extern int ccw_device_halt(struct ccw_device *, unsigned long);
190extern int ccw_device_clear(struct ccw_device *, unsigned long);
191int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw,
192 unsigned long intparm, u8 lpm, u8 key);
193int ccw_device_tm_start_key(struct ccw_device *, struct tcw *,
194 unsigned long, u8, u8);
195int ccw_device_tm_start_timeout_key(struct ccw_device *, struct tcw *,
196 unsigned long, u8, u8, int);
197int ccw_device_tm_start(struct ccw_device *, struct tcw *,
198 unsigned long, u8);
199int ccw_device_tm_start_timeout(struct ccw_device *, struct tcw *,
200 unsigned long, u8, int);
201int ccw_device_tm_intrg(struct ccw_device *cdev);
202
203int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask);
204
205extern int ccw_device_set_online(struct ccw_device *cdev);
206extern int ccw_device_set_offline(struct ccw_device *cdev);
207
208
209extern struct ciw *ccw_device_get_ciw(struct ccw_device *, __u32 cmd);
210extern __u8 ccw_device_get_path_mask(struct ccw_device *);
211extern 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
218extern struct ccw_device *ccw_device_probe_console(void);
219extern int ccw_device_force_console(void);
220
221int ccw_device_siosl(struct ccw_device *);
222
223// FIXME: these have to go
224extern int _ccw_device_get_subchannel_number(struct ccw_device *);
225
226extern void *ccw_device_get_chp_desc(struct ccw_device *, int);
227#endif /* _S390_CCWDEV_H_ */