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/* 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, 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 */
#define TB_CFG_DEFAULT_TIMEOUT 5000 /* msec */
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 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_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_error(struct tb_ctl *ctl, u64 route, u32 port,
enum tb_cfg_error error);
struct tb_cfg_result tb_cfg_reset(struct tb_ctl *ctl, u64 route,
int timeout_msec);
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
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