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/* SPDX-License-Identifier: GPL-2.0-only */
/* Copyright (c) 2018-2021 Intel Corporation */
#ifndef __LINUX_PECI_H
#define __LINUX_PECI_H
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/types.h>
/*
* Currently we don't support any PECI command over 32 bytes.
*/
#define PECI_REQUEST_MAX_BUF_SIZE 32
struct peci_controller;
struct peci_request;
/**
* struct peci_controller_ops - PECI controller specific methods
* @xfer: PECI transfer function
*
* PECI controllers may have different hardware interfaces - the drivers
* implementing PECI controllers can use this structure to abstract away those
* differences by exposing a common interface for PECI core.
*/
struct peci_controller_ops {
int (*xfer)(struct peci_controller *controller, u8 addr, struct peci_request *req);
};
/**
* struct peci_controller - PECI controller
* @dev: device object to register PECI controller to the device model
* @ops: pointer to device specific controller operations
* @bus_lock: lock used to protect multiple callers
* @id: PECI controller ID
*
* PECI controllers usually connect to their drivers using non-PECI bus,
* such as the platform bus.
* Each PECI controller can communicate with one or more PECI devices.
*/
struct peci_controller {
struct device dev;
struct peci_controller_ops *ops;
struct mutex bus_lock; /* held for the duration of xfer */
u8 id;
};
struct peci_controller *devm_peci_controller_add(struct device *parent,
struct peci_controller_ops *ops);
static inline struct peci_controller *to_peci_controller(void *d)
{
return container_of(d, struct peci_controller, dev);
}
/**
* struct peci_device - PECI device
* @dev: device object to register PECI device to the device model
* @controller: manages the bus segment hosting this PECI device
* @info: PECI device characteristics
* @info.family: device family
* @info.model: device model
* @info.peci_revision: PECI revision supported by the PECI device
* @info.socket_id: the socket ID represented by the PECI device
* @addr: address used on the PECI bus connected to the parent controller
* @deleted: indicates that PECI device was already deleted
*
* A peci_device identifies a single device (i.e. CPU) connected to a PECI bus.
* The behaviour exposed to the rest of the system is defined by the PECI driver
* managing the device.
*/
struct peci_device {
struct device dev;
struct {
u16 family;
u8 model;
u8 peci_revision;
u8 socket_id;
} info;
u8 addr;
bool deleted;
};
static inline struct peci_device *to_peci_device(struct device *d)
{
return container_of(d, struct peci_device, dev);
}
/**
* struct peci_request - PECI request
* @device: PECI device to which the request is sent
* @tx: TX buffer specific data
* @tx.buf: TX buffer
* @tx.len: transfer data length in bytes
* @rx: RX buffer specific data
* @rx.buf: RX buffer
* @rx.len: received data length in bytes
*
* A peci_request represents a request issued by PECI originator (TX) and
* a response received from PECI responder (RX).
*/
struct peci_request {
struct peci_device *device;
struct {
u8 buf[PECI_REQUEST_MAX_BUF_SIZE];
u8 len;
} rx, tx;
};
#endif /* __LINUX_PECI_H */
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