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142 lines
4.6 KiB
142 lines
4.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Thunderbolt driver - control channel and configuration commands |
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* |
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* Copyright (c) 2014 Andreas Noever <[email protected]> |
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* Copyright (C) 2018, Intel Corporation |
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*/ |
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#ifndef _TB_CFG |
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#define _TB_CFG |
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#include <linux/kref.h> |
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#include <linux/thunderbolt.h> |
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#include "nhi.h" |
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#include "tb_msgs.h" |
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/* control channel */ |
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struct tb_ctl; |
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typedef bool (*event_cb)(void *data, enum tb_cfg_pkg_type type, |
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const void *buf, size_t size); |
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struct tb_ctl *tb_ctl_alloc(struct tb_nhi *nhi, int timeout_msec, event_cb cb, |
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void *cb_data); |
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void tb_ctl_start(struct tb_ctl *ctl); |
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void tb_ctl_stop(struct tb_ctl *ctl); |
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void tb_ctl_free(struct tb_ctl *ctl); |
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/* configuration commands */ |
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struct tb_cfg_result { |
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u64 response_route; |
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u32 response_port; /* |
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* If err = 1 then this is the port that send the |
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* error. |
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* If err = 0 and if this was a cfg_read/write then |
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* this is the the upstream port of the responding |
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* switch. |
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* Otherwise the field is set to zero. |
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*/ |
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int err; /* negative errors, 0 for success, 1 for tb errors */ |
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enum tb_cfg_error tb_error; /* valid if err == 1 */ |
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}; |
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struct ctl_pkg { |
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struct tb_ctl *ctl; |
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void *buffer; |
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struct ring_frame frame; |
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}; |
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/** |
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* struct tb_cfg_request - Control channel request |
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* @kref: Reference count |
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* @ctl: Pointer to the control channel structure. Only set when the |
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* request is queued. |
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* @request_size: Size of the request packet (in bytes) |
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* @request_type: Type of the request packet |
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* @response: Response is stored here |
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* @response_size: Maximum size of one response packet |
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* @response_type: Expected type of the response packet |
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* @npackets: Number of packets expected to be returned with this request |
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* @match: Function used to match the incoming packet |
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* @copy: Function used to copy the incoming packet to @response |
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* @callback: Callback called when the request is finished successfully |
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* @callback_data: Data to be passed to @callback |
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* @flags: Flags for the request |
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* @work: Work item used to complete the request |
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* @result: Result after the request has been completed |
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* @list: Requests are queued using this field |
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* |
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* An arbitrary request over Thunderbolt control channel. For standard |
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* control channel message, one should use tb_cfg_read/write() and |
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* friends if possible. |
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*/ |
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struct tb_cfg_request { |
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struct kref kref; |
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struct tb_ctl *ctl; |
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const void *request; |
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size_t request_size; |
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enum tb_cfg_pkg_type request_type; |
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void *response; |
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size_t response_size; |
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enum tb_cfg_pkg_type response_type; |
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size_t npackets; |
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bool (*match)(const struct tb_cfg_request *req, |
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const struct ctl_pkg *pkg); |
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bool (*copy)(struct tb_cfg_request *req, const struct ctl_pkg *pkg); |
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void (*callback)(void *callback_data); |
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void *callback_data; |
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unsigned long flags; |
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struct work_struct work; |
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struct tb_cfg_result result; |
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struct list_head list; |
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}; |
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#define TB_CFG_REQUEST_ACTIVE 0 |
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#define TB_CFG_REQUEST_CANCELED 1 |
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struct tb_cfg_request *tb_cfg_request_alloc(void); |
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void tb_cfg_request_get(struct tb_cfg_request *req); |
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void tb_cfg_request_put(struct tb_cfg_request *req); |
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int tb_cfg_request(struct tb_ctl *ctl, struct tb_cfg_request *req, |
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void (*callback)(void *), void *callback_data); |
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void tb_cfg_request_cancel(struct tb_cfg_request *req, int err); |
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struct tb_cfg_result tb_cfg_request_sync(struct tb_ctl *ctl, |
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struct tb_cfg_request *req, int timeout_msec); |
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static inline u64 tb_cfg_get_route(const struct tb_cfg_header *header) |
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{ |
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return (u64) header->route_hi << 32 | header->route_lo; |
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} |
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static inline struct tb_cfg_header tb_cfg_make_header(u64 route) |
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{ |
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struct tb_cfg_header header = { |
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.route_hi = route >> 32, |
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.route_lo = route, |
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}; |
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/* check for overflow, route_hi is not 32 bits! */ |
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WARN_ON(tb_cfg_get_route(&header) != route); |
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return header; |
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} |
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int tb_cfg_ack_plug(struct tb_ctl *ctl, u64 route, u32 port, bool unplug); |
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struct tb_cfg_result tb_cfg_reset(struct tb_ctl *ctl, u64 route); |
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struct tb_cfg_result tb_cfg_read_raw(struct tb_ctl *ctl, void *buffer, |
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u64 route, u32 port, |
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enum tb_cfg_space space, u32 offset, |
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u32 length, int timeout_msec); |
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struct tb_cfg_result tb_cfg_write_raw(struct tb_ctl *ctl, const void *buffer, |
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u64 route, u32 port, |
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enum tb_cfg_space space, u32 offset, |
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u32 length, int timeout_msec); |
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int tb_cfg_read(struct tb_ctl *ctl, void *buffer, u64 route, u32 port, |
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enum tb_cfg_space space, u32 offset, u32 length); |
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int tb_cfg_write(struct tb_ctl *ctl, const void *buffer, u64 route, u32 port, |
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enum tb_cfg_space space, u32 offset, u32 length); |
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int tb_cfg_get_upstream_port(struct tb_ctl *ctl, u64 route); |
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#endif
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