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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
f25bf6fc AN |
2 | /* |
3 | * Thunderbolt Cactus Ridge driver - control channel and configuration commands | |
4 | * | |
5 | * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> | |
6 | */ | |
7 | ||
8 | #ifndef _TB_CFG | |
9 | #define _TB_CFG | |
10 | ||
d7f781bf | 11 | #include <linux/kref.h> |
eaf8ff35 | 12 | #include <linux/thunderbolt.h> |
d7f781bf | 13 | |
f25bf6fc | 14 | #include "nhi.h" |
32af9434 | 15 | #include "tb_msgs.h" |
f25bf6fc AN |
16 | |
17 | /* control channel */ | |
18 | struct tb_ctl; | |
19 | ||
d1ff7024 | 20 | typedef bool (*event_cb)(void *data, enum tb_cfg_pkg_type type, |
81a54b5e | 21 | const void *buf, size_t size); |
f25bf6fc | 22 | |
81a54b5e | 23 | struct tb_ctl *tb_ctl_alloc(struct tb_nhi *nhi, event_cb cb, void *cb_data); |
f25bf6fc AN |
24 | void tb_ctl_start(struct tb_ctl *ctl); |
25 | void tb_ctl_stop(struct tb_ctl *ctl); | |
26 | void tb_ctl_free(struct tb_ctl *ctl); | |
27 | ||
28 | /* configuration commands */ | |
29 | ||
30 | #define TB_CFG_DEFAULT_TIMEOUT 5000 /* msec */ | |
31 | ||
f25bf6fc AN |
32 | struct tb_cfg_result { |
33 | u64 response_route; | |
34 | u32 response_port; /* | |
35 | * If err = 1 then this is the port that send the | |
36 | * error. | |
37 | * If err = 0 and if this was a cfg_read/write then | |
38 | * this is the the upstream port of the responding | |
39 | * switch. | |
40 | * Otherwise the field is set to zero. | |
41 | */ | |
42 | int err; /* negative errors, 0 for success, 1 for tb errors */ | |
43 | enum tb_cfg_error tb_error; /* valid if err == 1 */ | |
44 | }; | |
45 | ||
d7f781bf MW |
46 | struct ctl_pkg { |
47 | struct tb_ctl *ctl; | |
48 | void *buffer; | |
49 | struct ring_frame frame; | |
50 | }; | |
51 | ||
52 | /** | |
53 | * struct tb_cfg_request - Control channel request | |
54 | * @kref: Reference count | |
55 | * @ctl: Pointer to the control channel structure. Only set when the | |
56 | * request is queued. | |
57 | * @request_size: Size of the request packet (in bytes) | |
58 | * @request_type: Type of the request packet | |
59 | * @response: Response is stored here | |
60 | * @response_size: Maximum size of one response packet | |
61 | * @response_type: Expected type of the response packet | |
62 | * @npackets: Number of packets expected to be returned with this request | |
63 | * @match: Function used to match the incoming packet | |
64 | * @copy: Function used to copy the incoming packet to @response | |
65 | * @callback: Callback called when the request is finished successfully | |
66 | * @callback_data: Data to be passed to @callback | |
67 | * @flags: Flags for the request | |
68 | * @work: Work item used to complete the request | |
69 | * @result: Result after the request has been completed | |
70 | * @list: Requests are queued using this field | |
71 | * | |
72 | * An arbitrary request over Thunderbolt control channel. For standard | |
73 | * control channel message, one should use tb_cfg_read/write() and | |
74 | * friends if possible. | |
75 | */ | |
76 | struct tb_cfg_request { | |
77 | struct kref kref; | |
78 | struct tb_ctl *ctl; | |
79 | const void *request; | |
80 | size_t request_size; | |
81 | enum tb_cfg_pkg_type request_type; | |
82 | void *response; | |
83 | size_t response_size; | |
84 | enum tb_cfg_pkg_type response_type; | |
85 | size_t npackets; | |
86 | bool (*match)(const struct tb_cfg_request *req, | |
87 | const struct ctl_pkg *pkg); | |
88 | bool (*copy)(struct tb_cfg_request *req, const struct ctl_pkg *pkg); | |
89 | void (*callback)(void *callback_data); | |
90 | void *callback_data; | |
91 | unsigned long flags; | |
92 | struct work_struct work; | |
93 | struct tb_cfg_result result; | |
94 | struct list_head list; | |
95 | }; | |
96 | ||
97 | #define TB_CFG_REQUEST_ACTIVE 0 | |
98 | #define TB_CFG_REQUEST_CANCELED 1 | |
99 | ||
100 | struct tb_cfg_request *tb_cfg_request_alloc(void); | |
101 | void tb_cfg_request_get(struct tb_cfg_request *req); | |
102 | void tb_cfg_request_put(struct tb_cfg_request *req); | |
103 | int tb_cfg_request(struct tb_ctl *ctl, struct tb_cfg_request *req, | |
104 | void (*callback)(void *), void *callback_data); | |
105 | void tb_cfg_request_cancel(struct tb_cfg_request *req, int err); | |
106 | struct tb_cfg_result tb_cfg_request_sync(struct tb_ctl *ctl, | |
107 | struct tb_cfg_request *req, int timeout_msec); | |
108 | ||
ac6c44de MW |
109 | static inline u64 tb_cfg_get_route(const struct tb_cfg_header *header) |
110 | { | |
111 | return (u64) header->route_hi << 32 | header->route_lo; | |
112 | } | |
f25bf6fc | 113 | |
05c242e9 MW |
114 | static inline struct tb_cfg_header tb_cfg_make_header(u64 route) |
115 | { | |
116 | struct tb_cfg_header header = { | |
117 | .route_hi = route >> 32, | |
118 | .route_lo = route, | |
119 | }; | |
120 | /* check for overflow, route_hi is not 32 bits! */ | |
121 | WARN_ON(tb_cfg_get_route(&header) != route); | |
122 | return header; | |
123 | } | |
124 | ||
f25bf6fc AN |
125 | int tb_cfg_error(struct tb_ctl *ctl, u64 route, u32 port, |
126 | enum tb_cfg_error error); | |
127 | struct tb_cfg_result tb_cfg_reset(struct tb_ctl *ctl, u64 route, | |
128 | int timeout_msec); | |
129 | struct tb_cfg_result tb_cfg_read_raw(struct tb_ctl *ctl, void *buffer, | |
130 | u64 route, u32 port, | |
131 | enum tb_cfg_space space, u32 offset, | |
132 | u32 length, int timeout_msec); | |
16a1258a | 133 | struct tb_cfg_result tb_cfg_write_raw(struct tb_ctl *ctl, const void *buffer, |
f25bf6fc AN |
134 | u64 route, u32 port, |
135 | enum tb_cfg_space space, u32 offset, | |
136 | u32 length, int timeout_msec); | |
137 | int tb_cfg_read(struct tb_ctl *ctl, void *buffer, u64 route, u32 port, | |
138 | enum tb_cfg_space space, u32 offset, u32 length); | |
16a1258a | 139 | int tb_cfg_write(struct tb_ctl *ctl, const void *buffer, u64 route, u32 port, |
f25bf6fc AN |
140 | enum tb_cfg_space space, u32 offset, u32 length); |
141 | int tb_cfg_get_upstream_port(struct tb_ctl *ctl, u64 route); | |
142 | ||
143 | ||
144 | #endif |