omap: i2c: add a timeout to the busy waiting
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / s390 / cio / css.h
blob7e37886de2310f0cabbf3fd51bfcd3987efc2090
1 #ifndef _CSS_H
2 #define _CSS_H
4 #include <linux/mutex.h>
5 #include <linux/wait.h>
6 #include <linux/workqueue.h>
7 #include <linux/device.h>
8 #include <linux/types.h>
10 #include <asm/cio.h>
11 #include <asm/chpid.h>
12 #include <asm/schid.h>
14 #include "cio.h"
17 * path grouping stuff
19 #define SPID_FUNC_SINGLE_PATH 0x00
20 #define SPID_FUNC_MULTI_PATH 0x80
21 #define SPID_FUNC_ESTABLISH 0x00
22 #define SPID_FUNC_RESIGN 0x40
23 #define SPID_FUNC_DISBAND 0x20
25 #define SNID_STATE1_RESET 0
26 #define SNID_STATE1_UNGROUPED 2
27 #define SNID_STATE1_GROUPED 3
29 #define SNID_STATE2_NOT_RESVD 0
30 #define SNID_STATE2_RESVD_ELSE 2
31 #define SNID_STATE2_RESVD_SELF 3
33 #define SNID_STATE3_MULTI_PATH 1
34 #define SNID_STATE3_SINGLE_PATH 0
36 struct path_state {
37 __u8 state1 : 2; /* path state value 1 */
38 __u8 state2 : 2; /* path state value 2 */
39 __u8 state3 : 1; /* path state value 3 */
40 __u8 resvd : 3; /* reserved */
41 } __attribute__ ((packed));
43 struct extended_cssid {
44 u8 version;
45 u8 cssid;
46 } __attribute__ ((packed));
48 struct pgid {
49 union {
50 __u8 fc; /* SPID function code */
51 struct path_state ps; /* SNID path state */
52 } __attribute__ ((packed)) inf;
53 union {
54 __u32 cpu_addr : 16; /* CPU address */
55 struct extended_cssid ext_cssid;
56 } __attribute__ ((packed)) pgid_high;
57 __u32 cpu_id : 24; /* CPU identification */
58 __u32 cpu_model : 16; /* CPU model */
59 __u32 tod_high; /* high word TOD clock */
60 } __attribute__ ((packed));
62 struct subchannel;
63 struct chp_link;
64 /**
65 * struct css_driver - device driver for subchannels
66 * @owner: owning module
67 * @subchannel_type: subchannel type supported by this driver
68 * @drv: embedded device driver structure
69 * @irq: called on interrupts
70 * @chp_event: called for events affecting a channel path
71 * @sch_event: called for events affecting the subchannel
72 * @probe: function called on probe
73 * @remove: function called on remove
74 * @shutdown: called at device shutdown
75 * @prepare: prepare for pm state transition
76 * @complete: undo work done in @prepare
77 * @freeze: callback for freezing during hibernation snapshotting
78 * @thaw: undo work done in @freeze
79 * @restore: callback for restoring after hibernation
80 * @settle: wait for asynchronous work to finish
81 * @name: name of the device driver
83 struct css_driver {
84 struct module *owner;
85 struct css_device_id *subchannel_type;
86 struct device_driver drv;
87 void (*irq)(struct subchannel *);
88 int (*chp_event)(struct subchannel *, struct chp_link *, int);
89 int (*sch_event)(struct subchannel *, int);
90 int (*probe)(struct subchannel *);
91 int (*remove)(struct subchannel *);
92 void (*shutdown)(struct subchannel *);
93 int (*prepare) (struct subchannel *);
94 void (*complete) (struct subchannel *);
95 int (*freeze)(struct subchannel *);
96 int (*thaw) (struct subchannel *);
97 int (*restore)(struct subchannel *);
98 int (*settle)(void);
99 const char *name;
102 #define to_cssdriver(n) container_of(n, struct css_driver, drv)
105 * all css_drivers have the css_bus_type
107 extern struct bus_type css_bus_type;
109 extern int css_driver_register(struct css_driver *);
110 extern void css_driver_unregister(struct css_driver *);
112 extern void css_sch_device_unregister(struct subchannel *);
113 extern int css_probe_device(struct subchannel_id);
114 extern struct subchannel *get_subchannel_by_schid(struct subchannel_id);
115 extern int css_init_done;
116 extern int max_ssid;
117 int for_each_subchannel_staged(int (*fn_known)(struct subchannel *, void *),
118 int (*fn_unknown)(struct subchannel_id,
119 void *), void *data);
120 extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
121 extern void css_reiterate_subchannels(void);
122 void css_update_ssd_info(struct subchannel *sch);
124 #define __MAX_SUBCHANNEL 65535
125 #define __MAX_SSID 3
127 struct channel_subsystem {
128 u8 cssid;
129 int valid;
130 struct channel_path *chps[__MAX_CHPID + 1];
131 struct device device;
132 struct pgid global_pgid;
133 struct mutex mutex;
134 /* channel measurement related */
135 int cm_enabled;
136 void *cub_addr1;
137 void *cub_addr2;
138 /* for orphaned ccw devices */
139 struct subchannel *pseudo_subchannel;
141 #define to_css(dev) container_of(dev, struct channel_subsystem, device)
143 extern struct bus_type css_bus_type;
144 extern struct channel_subsystem *channel_subsystems[];
146 /* Helper functions to build lists for the slow path. */
147 void css_schedule_eval(struct subchannel_id schid);
148 void css_schedule_eval_all(void);
149 int css_complete_work(void);
151 int sch_is_pseudo_sch(struct subchannel *);
152 struct schib;
153 int css_sch_is_valid(struct schib *);
155 extern struct workqueue_struct *cio_work_q;
156 void css_wait_for_slow_path(void);
157 void css_sched_sch_todo(struct subchannel *sch, enum sch_todo todo);
158 #endif