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