225 lines
6.5 KiB
C
225 lines
6.5 KiB
C
/**
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* @file
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*
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* @brief Generic low-level inter-processor mailbox communication API.
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*/
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/*
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* Copyright (c) 2015 Intel Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __INCipmh
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#define __INCipmh
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/**
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* @brief IPM Interface
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* @defgroup ipm_interface IPM Interface
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* @ingroup io_interfaces
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* @{
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*/
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#include <nanokernel.h>
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#include <device.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @typedef ipm_callback_t
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* @brief Callback API for incoming IPM messages
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*
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* These callbacks execute in interrupt context. Therefore, use only
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* interrupt-safe APIS. Registration of callbacks is done via
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* @a ipm_register_callback
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*
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* @param "void *context" Arbitrary context pointer provided at
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* registration time.
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* @param "uint32_t id" Message type identifier.
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* @param "volatile void *data" Message data pointer. The correct
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* amount of data to read out
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* must be inferred using the message id/upper level protocol.
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*/
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typedef void (*ipm_callback_t)(void *context, uint32_t id, volatile void *data);
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/**
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* @typedef ipm_send_t
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* @brief Callback API to send IPM messages
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*
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* See @a ipm_send() for argument definitions.
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*/
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typedef int (*ipm_send_t)(struct device *ipmdev, int wait, uint32_t id,
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const void *data, int size);
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/**
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* @typedef ipm_max_data_size_get_t
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* @brief Callback API to get maximum data size
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*
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* See @a ipm_max_data_size_get() for argument definitions.
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*/
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typedef int (*ipm_max_data_size_get_t)(struct device *ipmdev);
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/**
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* @typedef ipm_max_id_val_get_t
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* @brief Callback API to get the ID's maximum value
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*
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* See @a ipm_max_id_val_get() for argument definitions.
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*/
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typedef uint32_t (*ipm_max_id_val_get_t)(struct device *ipmdev);
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/**
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* @typedef ipm_register_callback_t
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* @brief Callback API upon registration
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*
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* See @a ipm_register_callback() for argument definitions.
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*/
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typedef void (*ipm_register_callback_t)(struct device *port, ipm_callback_t cb,
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void *cb_context);
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/**
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* @typedef ipm_set_enabled_t
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* @brief Callback API upon emablement of interrupts
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*
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* See @a ipm_set_enabled() for argument definitions.
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*/
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typedef int (*ipm_set_enabled_t)(struct device *ipmdev, int enable);
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struct ipm_driver_api {
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ipm_send_t send;
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ipm_register_callback_t register_callback;
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ipm_max_data_size_get_t max_data_size_get;
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ipm_max_id_val_get_t max_id_val_get;
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ipm_set_enabled_t set_enabled;
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};
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/**
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* @brief Try to send a message over the IPM device.
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*
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* A message is considered consumed once the remote interrupt handler
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* finishes. If there is deferred processing on the remote side,
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* or if outgoing messages must be queued and wait on an
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* event/semaphore, a high-level driver can implement that.
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*
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* There are constraints on how much data can be sent or the maximum value
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* of id. Use the @a ipm_max_data_size_get and @a ipm_max_id_val_get routines
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* to determine them.
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*
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* The @a size parameter is used only on the sending side to determine
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* the amount of data to put in the message registers. It is not passed along
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* to the receiving side. The upper-level protocol dictates the amount of
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* data read back.
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*
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* @param ipmdev Driver instance
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* @param wait Time to busy-wait for remote to consume the message.
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* @param id Message identifier. Values are constrained by
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* @a ipm_max_data_size_get since many platforms only allow for a
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* subset of bits in a 32-bit register to store the ID.
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* @param data Pointer to the data sent in the message.
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* @param size Size of the data.
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*
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* @retval EBUSY If the remote hasn't yet read the last data sent.
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* @retval EMSGSIZE If the supplied data size is unsupported by the driver.
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* @retval EINVAL If there was a bad parameter, such as: too-large id value.
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* or the device isn't an outbound IPM channel.
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* @retval 0 On success.
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*/
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static inline int ipm_send(struct device *ipmdev, int wait, uint32_t id,
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const void *data, int size)
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{
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struct ipm_driver_api *api;
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api = (struct ipm_driver_api *) ipmdev->driver_api;
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return api->send(ipmdev, wait, id, data, size);
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}
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/**
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* @brief Register a callback function for incoming messages.
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*
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* @param ipmdev Driver instance pointer.
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* @param cb Callback function to execute on incoming message interrupts.
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* @param context Application-specific context pointer which will be passed
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* to the callback function when executed.
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*/
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static inline void ipm_register_callback(struct device *ipmdev,
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ipm_callback_t cb, void *context)
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{
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struct ipm_driver_api *api;
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api = (struct ipm_driver_api *) ipmdev->driver_api;
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api->register_callback(ipmdev, cb, context);
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}
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/**
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* @brief Return the maximum number of bytes possible in an outbound message.
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*
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* IPM implementations vary on the amount of data that can be sent in a
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* single message since the data payload is typically stored in registers.
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*
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* @param ipmdev Driver instance pointer.
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*
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* @return Maximum possible size of a message in bytes.
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*/
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static inline int ipm_max_data_size_get(struct device *ipmdev)
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{
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struct ipm_driver_api *api;
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api = (struct ipm_driver_api *) ipmdev->driver_api;
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return api->max_data_size_get(ipmdev);
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}
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/**
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* @brief Return the maximum id value possible in an outbound message.
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*
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* Many IPM implementations store the message's ID in a register with
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* some bits reserved for other uses.
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*
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* @param ipmdev Driver instance pointer.
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*
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* @return Maximum possible value of a message ID.
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*/
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static inline uint32_t ipm_max_id_val_get(struct device *ipmdev)
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{
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struct ipm_driver_api *api;
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api = (struct ipm_driver_api *) ipmdev->driver_api;
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return api->max_id_val_get(ipmdev);
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}
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/**
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* @brief Enable interrupts and callbacks for inbound channels.
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*
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* @param ipmdev Driver instance pointer.
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* @param enable Set to 0 to disable and to nonzero to enable.
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*
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* @retval 0 On success.
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* @retval EINVAL If it isn't an inbound channel.
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*/
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static inline int ipm_set_enabled(struct device *ipmdev, int enable)
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{
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struct ipm_driver_api *api;
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api = (struct ipm_driver_api *) ipmdev->driver_api;
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return api->set_enabled(ipmdev, enable);
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}
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#ifdef __cplusplus
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}
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#endif
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/**
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* @}
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*/
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#endif /* __INCipmh */
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