include/linux/peci.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /* Copyright (c) 2018-2021 Intel Corporation */
   3
   4 #ifndef __LINUX_PECI_H
   5 #define __LINUX_PECI_H
   6
   7 #include <linux/device.h>
   8 #include <linux/kernel.h>
   9 #include <linux/mutex.h>
  10 #include <linux/types.h>
  11
  12 /*
  13  * Currently we don't support any PECI command over 32 bytes.
  14  */
  15 #define PECI_REQUEST_MAX_BUF_SIZE 32
  16
  17 struct peci_controller;
  18 struct peci_request;
  19
  20 /**
  21  * struct peci_controller_ops - PECI controller specific methods
  22  * @xfer: PECI transfer function
  23  *
  24  * PECI controllers may have different hardware interfaces - the drivers
  25  * implementing PECI controllers can use this structure to abstract away those
  26  * differences by exposing a common interface for PECI core.
  27  */
  28 struct peci_controller_ops {
  29         int (*xfer)(struct peci_controller *controller, u8 addr, struct peci_request *req);
  30 };
  31
  32 /**
  33  * struct peci_controller - PECI controller
  34  * @dev: device object to register PECI controller to the device model
  35  * @ops: pointer to device specific controller operations
  36  * @bus_lock: lock used to protect multiple callers
  37  * @id: PECI controller ID
  38  *
  39  * PECI controllers usually connect to their drivers using non-PECI bus,
  40  * such as the platform bus.
  41  * Each PECI controller can communicate with one or more PECI devices.
  42  */
  43 struct peci_controller {
  44         struct device dev;
  45         const struct peci_controller_ops *ops;
  46         struct mutex bus_lock; /* held for the duration of xfer */
  47         u8 id;
  48 };
  49
  50 struct peci_controller *devm_peci_controller_add(struct device *parent,
  51                                                  const struct peci_controller_ops *ops);
  52
  53 static inline struct peci_controller *to_peci_controller(void *d)
  54 {
  55         return container_of(d, struct peci_controller, dev);
  56 }
  57
  58 /**
  59  * struct peci_device - PECI device
  60  * @dev: device object to register PECI device to the device model
  61  * @info: PECI device characteristics
  62  * @info.x86_vfm: device vendor-family-model
  63  * @info.peci_revision: PECI revision supported by the PECI device
  64  * @info.socket_id: the socket ID represented by the PECI device
  65  * @addr: address used on the PECI bus connected to the parent controller
  66  * @deleted: indicates that PECI device was already deleted
  67  *
  68  * A peci_device identifies a single device (i.e. CPU) connected to a PECI bus.
  69  * The behaviour exposed to the rest of the system is defined by the PECI driver
  70  * managing the device.
  71  */
  72 struct peci_device {
  73         struct device dev;
  74         struct {
  75                 u32 x86_vfm;
  76                 u8 peci_revision;
  77                 u8 socket_id;
  78         } info;
  79         u8 addr;
  80         bool deleted;
  81 };
  82
  83 static inline struct peci_device *to_peci_device(struct device *d)
  84 {
  85         return container_of(d, struct peci_device, dev);
  86 }
  87
  88 /**
  89  * struct peci_request - PECI request
  90  * @device: PECI device to which the request is sent
  91  * @tx: TX buffer specific data
  92  * @tx.buf: TX buffer
  93  * @tx.len: transfer data length in bytes
  94  * @rx: RX buffer specific data
  95  * @rx.buf: RX buffer
  96  * @rx.len: received data length in bytes
  97  *
  98  * A peci_request represents a request issued by PECI originator (TX) and
  99  * a response received from PECI responder (RX).
 100  */
 101 struct peci_request {
 102         struct peci_device *device;
 103         struct {
 104                 u8 buf[PECI_REQUEST_MAX_BUF_SIZE];
 105                 u8 len;
 106         } rx, tx;
 107 };
 108
 109 #endif /* __LINUX_PECI_H */