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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright IBM Corp. 2002, 2009
4 *
5 * Author(s): Arnd Bergmann <arndb@de.ibm.com>
6 *
7 * Interface for CCW device drivers
8 */
9#ifndef _S390_CCWDEV_H_
10#define _S390_CCWDEV_H_
11
12#include <linux/device.h>
13#include <linux/mod_devicetable.h>
14#include <asm/fcx.h>
15#include <asm/irq.h>
16#include <asm/schid.h>
17
18/* structs from asm/cio.h */
19struct irb;
20struct ccw1;
21struct ccw_dev_id;
22
23/* simplified initializers for struct ccw_device:
24 * CCW_DEVICE and CCW_DEVICE_DEVTYPE initialize one
25 * entry in your MODULE_DEVICE_TABLE and set the match_flag correctly */
26#define CCW_DEVICE(cu, cum) \
27 .cu_type=(cu), .cu_model=(cum), \
28 .match_flags=(CCW_DEVICE_ID_MATCH_CU_TYPE \
29 | (cum ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0))
30
31#define CCW_DEVICE_DEVTYPE(cu, cum, dev, devm) \
32 .cu_type=(cu), .cu_model=(cum), .dev_type=(dev), .dev_model=(devm),\
33 .match_flags=CCW_DEVICE_ID_MATCH_CU_TYPE \
34 | ((cum) ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0) \
35 | CCW_DEVICE_ID_MATCH_DEVICE_TYPE \
36 | ((devm) ? CCW_DEVICE_ID_MATCH_DEVICE_MODEL : 0)
37
38/* scan through an array of device ids and return the first
39 * entry that matches the device.
40 *
41 * the array must end with an entry containing zero match_flags
42 */
43static inline const struct ccw_device_id *
44ccw_device_id_match(const struct ccw_device_id *array,
45 const struct ccw_device_id *match)
46{
47 const struct ccw_device_id *id = array;
48
49 for (id = array; id->match_flags; id++) {
50 if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_TYPE)
51 && (id->cu_type != match->cu_type))
52 continue;
53
54 if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_MODEL)
55 && (id->cu_model != match->cu_model))
56 continue;
57
58 if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_TYPE)
59 && (id->dev_type != match->dev_type))
60 continue;
61
62 if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_MODEL)
63 && (id->dev_model != match->dev_model))
64 continue;
65
66 return id;
67 }
68
69 return NULL;
70}
71
72/**
73 * struct ccw_device - channel attached device
74 * @ccwlock: pointer to device lock
75 * @id: id of this device
76 * @drv: ccw driver for this device
77 * @dev: embedded device structure
78 * @online: online status of device
79 * @handler: interrupt handler
80 *
81 * @handler is a member of the device rather than the driver since a driver
82 * can have different interrupt handlers for different ccw devices
83 * (multi-subchannel drivers).
84 */
85struct ccw_device {
86 spinlock_t *ccwlock;
87/* private: */
88 struct ccw_device_private *private; /* cio private information */
89/* public: */
90 struct ccw_device_id id;
91 struct ccw_driver *drv;
92 struct device dev;
93 int online;
94 void (*handler) (struct ccw_device *, unsigned long, struct irb *);
95};
96
97/*
98 * Possible events used by the path_event notifier.
99 */
100#define PE_NONE 0x0
101#define PE_PATH_GONE 0x1 /* A path is no longer available. */
102#define PE_PATH_AVAILABLE 0x2 /* A path has become available and
103 was successfully verified. */
104#define PE_PATHGROUP_ESTABLISHED 0x4 /* A pathgroup was reset and had
105 to be established again. */
106
107/*
108 * Possible CIO actions triggered by the unit check handler.
109 */
110enum uc_todo {
111 UC_TODO_RETRY,
112 UC_TODO_RETRY_ON_NEW_PATH,
113 UC_TODO_STOP
114};
115
116/**
117 * struct ccw driver - device driver for channel attached devices
118 * @ids: ids supported by this driver
119 * @probe: function called on probe
120 * @remove: function called on remove
121 * @set_online: called when setting device online
122 * @set_offline: called when setting device offline
123 * @notify: notify driver of device state changes
124 * @path_event: notify driver of channel path events
125 * @shutdown: called at device shutdown
126 * @prepare: prepare for pm state transition
127 * @complete: undo work done in @prepare
128 * @freeze: callback for freezing during hibernation snapshotting
129 * @thaw: undo work done in @freeze
130 * @restore: callback for restoring after hibernation
131 * @uc_handler: callback for unit check handler
132 * @driver: embedded device driver structure
133 * @int_class: interruption class to use for accounting interrupts
134 */
135struct ccw_driver {
136 struct ccw_device_id *ids;
137 int (*probe) (struct ccw_device *);
138 void (*remove) (struct ccw_device *);
139 int (*set_online) (struct ccw_device *);
140 int (*set_offline) (struct ccw_device *);
141 int (*notify) (struct ccw_device *, int);
142 void (*path_event) (struct ccw_device *, int *);
143 void (*shutdown) (struct ccw_device *);
144 int (*prepare) (struct ccw_device *);
145 void (*complete) (struct ccw_device *);
146 int (*freeze)(struct ccw_device *);
147 int (*thaw) (struct ccw_device *);
148 int (*restore)(struct ccw_device *);
149 enum uc_todo (*uc_handler) (struct ccw_device *, struct irb *);
150 struct device_driver driver;
151 enum interruption_class int_class;
152};
153
154extern struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
155 const char *bus_id);
156
157/* devices drivers call these during module load and unload.
158 * When a driver is registered, its probe method is called
159 * when new devices for its type pop up */
160extern int ccw_driver_register (struct ccw_driver *driver);
161extern void ccw_driver_unregister (struct ccw_driver *driver);
162
163struct ccw1;
164
165extern int ccw_device_set_options_mask(struct ccw_device *, unsigned long);
166extern int ccw_device_set_options(struct ccw_device *, unsigned long);
167extern void ccw_device_clear_options(struct ccw_device *, unsigned long);
168int ccw_device_is_pathgroup(struct ccw_device *cdev);
169int ccw_device_is_multipath(struct ccw_device *cdev);
170
171/* Allow for i/o completion notification after primary interrupt status. */
172#define CCWDEV_EARLY_NOTIFICATION 0x0001
173/* Report all interrupt conditions. */
174#define CCWDEV_REPORT_ALL 0x0002
175/* Try to perform path grouping. */
176#define CCWDEV_DO_PATHGROUP 0x0004
177/* Allow forced onlining of boxed devices. */
178#define CCWDEV_ALLOW_FORCE 0x0008
179/* Try to use multipath mode. */
180#define CCWDEV_DO_MULTIPATH 0x0010
181
182extern int ccw_device_start(struct ccw_device *, struct ccw1 *,
183 unsigned long, __u8, unsigned long);
184extern int ccw_device_start_timeout(struct ccw_device *, struct ccw1 *,
185 unsigned long, __u8, unsigned long, int);
186extern int ccw_device_start_key(struct ccw_device *, struct ccw1 *,
187 unsigned long, __u8, __u8, unsigned long);
188extern int ccw_device_start_timeout_key(struct ccw_device *, struct ccw1 *,
189 unsigned long, __u8, __u8,
190 unsigned long, int);
191
192
193extern int ccw_device_resume(struct ccw_device *);
194extern int ccw_device_halt(struct ccw_device *, unsigned long);
195extern int ccw_device_clear(struct ccw_device *, unsigned long);
196int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw,
197 unsigned long intparm, u8 lpm, u8 key);
198int ccw_device_tm_start_key(struct ccw_device *, struct tcw *,
199 unsigned long, u8, u8);
200int ccw_device_tm_start_timeout_key(struct ccw_device *, struct tcw *,
201 unsigned long, u8, u8, int);
202int ccw_device_tm_start(struct ccw_device *, struct tcw *,
203 unsigned long, u8);
204int ccw_device_tm_start_timeout(struct ccw_device *, struct tcw *,
205 unsigned long, u8, int);
206int ccw_device_tm_intrg(struct ccw_device *cdev);
207
208int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask);
209
210extern int ccw_device_set_online(struct ccw_device *cdev);
211extern int ccw_device_set_offline(struct ccw_device *cdev);
212
213
214extern struct ciw *ccw_device_get_ciw(struct ccw_device *, __u32 cmd);
215extern __u8 ccw_device_get_path_mask(struct ccw_device *);
216extern void ccw_device_get_id(struct ccw_device *, struct ccw_dev_id *);
217
218#define get_ccwdev_lock(x) (x)->ccwlock
219
220#define to_ccwdev(n) container_of(n, struct ccw_device, dev)
221#define to_ccwdrv(n) container_of(n, struct ccw_driver, driver)
222
223extern struct ccw_device *ccw_device_create_console(struct ccw_driver *);
224extern void ccw_device_destroy_console(struct ccw_device *);
225extern int ccw_device_enable_console(struct ccw_device *);
226extern void ccw_device_wait_idle(struct ccw_device *);
227extern int ccw_device_force_console(struct ccw_device *);
228
229extern void *ccw_device_dma_zalloc(struct ccw_device *cdev, size_t size);
230extern void ccw_device_dma_free(struct ccw_device *cdev,
231 void *cpu_addr, size_t size);
232
233int ccw_device_siosl(struct ccw_device *);
234
235extern void ccw_device_get_schid(struct ccw_device *, struct subchannel_id *);
236
237struct channel_path_desc_fmt0 *ccw_device_get_chp_desc(struct ccw_device *, int);
238u8 *ccw_device_get_util_str(struct ccw_device *cdev, int chp_idx);
239#endif /* _S390_CCWDEV_H_ */