aboutsummaryrefslogtreecommitdiffstats
path: root/include/asm-s390/ccwdev.h
blob: 3eb231af5d514b6369a99bb561bb2b510357504f (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
/*
 *  include/asm-s390/ccwdev.h
 *  include/asm-s390x/ccwdev.h
 *
 *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author(s): Arnd Bergmann <arndb@de.ibm.com>
 *
 *  Interface for CCW device drivers
 */
#ifndef _S390_CCWDEV_H_
#define _S390_CCWDEV_H_

#include <linux/device.h>
#include <linux/mod_devicetable.h>

/* structs from asm/cio.h */
struct irb;
struct ccw1;

/* simplified initializers for struct ccw_device:
 * CCW_DEVICE and CCW_DEVICE_DEVTYPE initialize one
 * entry in your MODULE_DEVICE_TABLE and set the match_flag correctly */
#define CCW_DEVICE(cu, cum) 						\
	.cu_type=(cu), .cu_model=(cum),					\
	.match_flags=(CCW_DEVICE_ID_MATCH_CU_TYPE			\
		   | (cum ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0))

#define CCW_DEVICE_DEVTYPE(cu, cum, dev, devm)				\
	.cu_type=(cu), .cu_model=(cum), .dev_type=(dev), .dev_model=(devm),\
	.match_flags=CCW_DEVICE_ID_MATCH_CU_TYPE			\
		   | ((cum) ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0) 	\
		   | CCW_DEVICE_ID_MATCH_DEVICE_TYPE			\
		   | ((devm) ? CCW_DEVICE_ID_MATCH_DEVICE_MODEL : 0)

/* scan through an array of device ids and return the first
 * entry that matches the device.
 *
 * the array must end with an entry containing zero match_flags
 */
static inline const struct ccw_device_id *
ccw_device_id_match(const struct ccw_device_id *array,
			const struct ccw_device_id *match)
{
	const struct ccw_device_id *id = array;

	for (id = array; id->match_flags; id++) {
		if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_TYPE)
		    && (id->cu_type != match->cu_type))
			continue;

		if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_MODEL)
		    && (id->cu_model != match->cu_model))
			continue;

		if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_TYPE)
		    && (id->dev_type != match->dev_type))
			continue;

		if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_MODEL)
		    && (id->dev_model != match->dev_model))
			continue;

		return id;
	}

	return 0;
}

/* The struct ccw device is our replacement for the globally accessible
 * ioinfo array. ioinfo will mutate into a subchannel device later.
 *
 * Reference: Documentation/s390/driver-model.txt */
struct ccw_device {
	spinlock_t *ccwlock;
	struct ccw_device_private *private;	/* cio private information */
	struct ccw_device_id id;	/* id of this device, driver_info is
					   set by ccw_find_driver */
	struct ccw_driver *drv;		/* */
	struct device dev;		/* */
	int online;
	/* This is sick, but a driver can have different interrupt handlers 
	   for different ccw_devices (multi-subchannel drivers)... */
	void (*handler) (struct ccw_device *, unsigned long, struct irb *);
};


/* Each ccw driver registers with the ccw root bus */
struct ccw_driver {
	struct module *owner;		/* for automatic MOD_INC_USE_COUNT   */
	struct ccw_device_id *ids;	/* probe driver with these devs      */
	int (*probe) (struct ccw_device *); /* ask driver to probe dev 	     */
	void (*remove) (struct ccw_device *);
					/* device is no longer available     */
	int (*set_online) (struct ccw_device *);
	int (*set_offline) (struct ccw_device *);
	int (*notify) (struct ccw_device *, int);
	struct device_driver driver;	/* higher level structure, don't init
					   this from your driver	     */
	char *name;
};

extern struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
					      const char *bus_id);

/* devices drivers call these during module load and unload.
 * When a driver is registered, its probe method is called
 * when new devices for its type pop up */
extern int  ccw_driver_register   (struct ccw_driver *driver);
extern void ccw_driver_unregister (struct ccw_driver *driver);

struct ccw1;

extern int ccw_device_set_options(struct ccw_device *, unsigned long);

/* Allow for i/o completion notification after primary interrupt status. */
#define CCWDEV_EARLY_NOTIFICATION	0x0001
/* Report all interrupt conditions. */
#define CCWDEV_REPORT_ALL	 	0x0002
/* Try to perform path grouping. */
#define CCWDEV_DO_PATHGROUP             0x0004
/* Allow forced onlining of boxed devices. */
#define CCWDEV_ALLOW_FORCE              0x0008

/*
 * ccw_device_start()
 *
 *  Start a S/390 channel program. When the interrupt arrives, the
 *  IRQ handler is called, either immediately, delayed (dev-end missing,
 *  or sense required) or never (no IRQ handler registered).
 *  Depending on the action taken, ccw_device_start() returns:  
 *                           0	     - Success
 *			     -EBUSY  - Device busy, or status pending
 *			     -ENODEV - Device not operational
 *                           -EINVAL - Device invalid for operation
 */
extern int ccw_device_start(struct ccw_device *, struct ccw1 *,
			    unsigned long, __u8, unsigned long);
/*
 * ccw_device_start_timeout()
 *
 * This function notifies the device driver if the channel program has not
 * completed during the specified time. If a timeout occurs, the channel
 * program is terminated via xsch(), hsch() or csch().
 */
extern int ccw_device_start_timeout(struct ccw_device *, struct ccw1 *,
				    unsigned long, __u8, unsigned long, int);
/*
 * ccw_device_start_key()
 * ccw_device_start_key_timeout()
 *
 * Same as ccw_device_start() and ccw_device_start_timeout(), except a
 * storage key != default key can be provided for the I/O.
 */
extern int ccw_device_start_key(struct ccw_device *, struct ccw1 *,
				unsigned long, __u8, __u8, unsigned long);
extern int ccw_device_start_timeout_key(struct ccw_device *, struct ccw1 *,
					unsigned long, __u8, __u8,
					unsigned long, int);


extern int ccw_device_resume(struct ccw_device *);
extern int ccw_device_halt(struct ccw_device *, unsigned long);
extern int ccw_device_clear(struct ccw_device *, unsigned long);

extern int read_dev_chars(struct ccw_device *cdev, void **buffer, int length);
extern int read_conf_data(struct ccw_device *cdev, void **buffer, int *length);
extern int read_conf_data_lpm(struct ccw_device *cdev, void **buffer,
			      int *length, __u8 lpm);

extern int ccw_device_set_online(struct ccw_device *cdev);
extern int ccw_device_set_offline(struct ccw_device *cdev);


extern struct ciw *ccw_device_get_ciw(struct ccw_device *, __u32 cmd);
extern __u8 ccw_device_get_path_mask(struct ccw_device *);

#define get_ccwdev_lock(x) (x)->ccwlock

#define to_ccwdev(n) container_of(n, struct ccw_device, dev)
#define to_ccwdrv(n) container_of(n, struct ccw_driver, driver)

extern struct ccw_device *ccw_device_probe_console(void);

// FIXME: these have to go
extern int _ccw_device_get_device_number(struct ccw_device *);
extern int _ccw_device_get_subchannel_number(struct ccw_device *);

extern struct device *s390_root_dev_register(const char *);
extern void s390_root_dev_unregister(struct device *);

extern void *ccw_device_get_chp_desc(struct ccw_device *, int);
#endif /* _S390_CCWDEV_H_ */