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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145/* SPDX-License-Identifier: GPL-2.0 *//* * Thunderbolt driver - control channel and configuration commands * * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> * Copyright (C) 2018, Intel Corporation */
#ifndef _TB_CFG#define _TB_CFG
#include <linux/kref.h>#include <linux/thunderbolt.h>
#include "nhi.h"#include "tb_msgs.h"
/* control channel */struct tb_ctl;
typedef bool (*event_cb)(void *data, enum tb_cfg_pkg_type type, const void *buf, size_t size);
struct tb_ctl *tb_ctl_alloc(struct tb_nhi *nhi, int index, int timeout_msec, event_cb cb, void *cb_data);void tb_ctl_start(struct tb_ctl *ctl);void tb_ctl_stop(struct tb_ctl *ctl);void tb_ctl_free(struct tb_ctl *ctl);
/* configuration commands */
struct tb_cfg_result { u64 response_route; u32 response_port; /* * If err = 1 then this is the port that send the * error. * If err = 0 and if this was a cfg_read/write then * this is the upstream port of the responding * switch. * Otherwise the field is set to zero. */ int err; /* negative errors, 0 for success, 1 for tb errors */ enum tb_cfg_error tb_error; /* valid if err == 1 */};
struct ctl_pkg { struct tb_ctl *ctl; void *buffer; struct ring_frame frame;};
/** * struct tb_cfg_request - Control channel request * @kref: Reference count * @ctl: Pointer to the control channel structure. Only set when the * request is queued. * @request: Request is stored here * @request_size: Size of the request packet (in bytes) * @request_type: Type of the request packet * @response: Response is stored here * @response_size: Maximum size of one response packet * @response_type: Expected type of the response packet * @npackets: Number of packets expected to be returned with this request * @match: Function used to match the incoming packet * @copy: Function used to copy the incoming packet to @response * @callback: Callback called when the request is finished successfully * @callback_data: Data to be passed to @callback * @flags: Flags for the request * @work: Work item used to complete the request * @result: Result after the request has been completed * @list: Requests are queued using this field * * An arbitrary request over Thunderbolt control channel. For standard * control channel message, one should use tb_cfg_read/write() and * friends if possible. */struct tb_cfg_request { struct kref kref; struct tb_ctl *ctl; const void *request; size_t request_size; enum tb_cfg_pkg_type request_type; void *response; size_t response_size; enum tb_cfg_pkg_type response_type; size_t npackets; bool (*match)(const struct tb_cfg_request *req, const struct ctl_pkg *pkg); bool (*copy)(struct tb_cfg_request *req, const struct ctl_pkg *pkg); void (*callback)(void *callback_data); void *callback_data; unsigned long flags; struct work_struct work; struct tb_cfg_result result; struct list_head list;};
#define TB_CFG_REQUEST_ACTIVE 0#define TB_CFG_REQUEST_CANCELED 1
struct tb_cfg_request *tb_cfg_request_alloc(void);void tb_cfg_request_get(struct tb_cfg_request *req);void tb_cfg_request_put(struct tb_cfg_request *req);int tb_cfg_request(struct tb_ctl *ctl, struct tb_cfg_request *req, void (*callback)(void *), void *callback_data);void tb_cfg_request_cancel(struct tb_cfg_request *req, int err);struct tb_cfg_result tb_cfg_request_sync(struct tb_ctl *ctl, struct tb_cfg_request *req, int timeout_msec);
static inline u64 tb_cfg_get_route(const struct tb_cfg_header *header){ return (u64) header->route_hi << 32 | header->route_lo;}
static inline struct tb_cfg_header tb_cfg_make_header(u64 route){ struct tb_cfg_header header = { .route_hi = route >> 32, .route_lo = route, }; /* check for overflow, route_hi is not 32 bits! */ WARN_ON(tb_cfg_get_route(&header) != route); return header;}
int tb_cfg_ack_notification(struct tb_ctl *ctl, u64 route, const struct cfg_error_pkg *error);int tb_cfg_ack_plug(struct tb_ctl *ctl, u64 route, u32 port, bool unplug);struct tb_cfg_result tb_cfg_reset(struct tb_ctl *ctl, u64 route);struct tb_cfg_result tb_cfg_read_raw(struct tb_ctl *ctl, void *buffer, u64 route, u32 port, enum tb_cfg_space space, u32 offset, u32 length, int timeout_msec);struct tb_cfg_result tb_cfg_write_raw(struct tb_ctl *ctl, const void *buffer, u64 route, u32 port, enum tb_cfg_space space, u32 offset, u32 length, int timeout_msec);int tb_cfg_read(struct tb_ctl *ctl, void *buffer, u64 route, u32 port, enum tb_cfg_space space, u32 offset, u32 length);int tb_cfg_write(struct tb_ctl *ctl, const void *buffer, u64 route, u32 port, enum tb_cfg_space space, u32 offset, u32 length);int tb_cfg_get_upstream_port(struct tb_ctl *ctl, u64 route);
#endif