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9#ifndef __CONNECTION_H
10#define __CONNECTION_H
11
12#include <linux/bits.h>
13#include <linux/list.h>
14#include <linux/kfifo.h>
15#include <linux/kref.h>
16#include <linux/workqueue.h>
17
18#define GB_CONNECTION_FLAG_CSD BIT(0)
19#define GB_CONNECTION_FLAG_NO_FLOWCTRL BIT(1)
20#define GB_CONNECTION_FLAG_OFFLOADED BIT(2)
21#define GB_CONNECTION_FLAG_CDSI1 BIT(3)
22#define GB_CONNECTION_FLAG_CONTROL BIT(4)
23#define GB_CONNECTION_FLAG_HIGH_PRIO BIT(5)
24
25#define GB_CONNECTION_FLAG_CORE_MASK GB_CONNECTION_FLAG_CONTROL
26
27enum gb_connection_state {
28 GB_CONNECTION_STATE_DISABLED = 0,
29 GB_CONNECTION_STATE_ENABLED_TX = 1,
30 GB_CONNECTION_STATE_ENABLED = 2,
31 GB_CONNECTION_STATE_DISCONNECTING = 3,
32};
33
34struct gb_operation;
35
36typedef int (*gb_request_handler_t)(struct gb_operation *);
37
38struct gb_connection {
39 struct gb_host_device *hd;
40 struct gb_interface *intf;
41 struct gb_bundle *bundle;
42 struct kref kref;
43 u16 hd_cport_id;
44 u16 intf_cport_id;
45
46 struct list_head hd_links;
47 struct list_head bundle_links;
48
49 gb_request_handler_t handler;
50 unsigned long flags;
51
52 struct mutex mutex;
53 spinlock_t lock;
54 enum gb_connection_state state;
55 struct list_head operations;
56
57 char name[16];
58 struct workqueue_struct *wq;
59
60 atomic_t op_cycle;
61
62 void *private;
63
64 bool mode_switch;
65};
66
67struct gb_connection *gb_connection_create_static(struct gb_host_device *hd,
68 u16 hd_cport_id, gb_request_handler_t handler);
69struct gb_connection *gb_connection_create_control(struct gb_interface *intf);
70struct gb_connection *gb_connection_create(struct gb_bundle *bundle,
71 u16 cport_id, gb_request_handler_t handler);
72struct gb_connection *gb_connection_create_flags(struct gb_bundle *bundle,
73 u16 cport_id, gb_request_handler_t handler,
74 unsigned long flags);
75struct gb_connection *gb_connection_create_offloaded(struct gb_bundle *bundle,
76 u16 cport_id, unsigned long flags);
77void gb_connection_destroy(struct gb_connection *connection);
78
79static inline bool gb_connection_is_static(struct gb_connection *connection)
80{
81 return !connection->intf;
82}
83
84int gb_connection_enable(struct gb_connection *connection);
85int gb_connection_enable_tx(struct gb_connection *connection);
86void gb_connection_disable_rx(struct gb_connection *connection);
87void gb_connection_disable(struct gb_connection *connection);
88void gb_connection_disable_forced(struct gb_connection *connection);
89
90void gb_connection_mode_switch_prepare(struct gb_connection *connection);
91void gb_connection_mode_switch_complete(struct gb_connection *connection);
92
93void greybus_data_rcvd(struct gb_host_device *hd, u16 cport_id,
94 u8 *data, size_t length);
95
96void gb_connection_latency_tag_enable(struct gb_connection *connection);
97void gb_connection_latency_tag_disable(struct gb_connection *connection);
98
99static inline bool gb_connection_e2efc_enabled(struct gb_connection *connection)
100{
101 return !(connection->flags & GB_CONNECTION_FLAG_CSD);
102}
103
104static inline bool
105gb_connection_flow_control_disabled(struct gb_connection *connection)
106{
107 return connection->flags & GB_CONNECTION_FLAG_NO_FLOWCTRL;
108}
109
110static inline bool gb_connection_is_offloaded(struct gb_connection *connection)
111{
112 return connection->flags & GB_CONNECTION_FLAG_OFFLOADED;
113}
114
115static inline bool gb_connection_is_control(struct gb_connection *connection)
116{
117 return connection->flags & GB_CONNECTION_FLAG_CONTROL;
118}
119
120static inline void *gb_connection_get_data(struct gb_connection *connection)
121{
122 return connection->private;
123}
124
125static inline void gb_connection_set_data(struct gb_connection *connection,
126 void *data)
127{
128 connection->private = data;
129}
130
131#endif
132
