146 lines
4.6 KiB
C
146 lines
4.6 KiB
C
/* 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 <andreas.noever@gmail.com>
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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, event_cb cb, 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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#define TB_CFG_DEFAULT_TIMEOUT 5000 /* msec */
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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_error(struct tb_ctl *ctl, u64 route, u32 port,
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enum tb_cfg_error error);
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struct tb_cfg_result tb_cfg_reset(struct tb_ctl *ctl, u64 route,
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int timeout_msec);
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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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