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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Implements utilities for shared firmware management of EdgeTPU.
*
* Copyright (C) 2020 Google, Inc.
*/
#ifndef __EDGETPU_SHARED_FW_H__
#define __EDGETPU_SHARED_FW_H__
#include <linux/device.h>
#include "edgetpu-internal.h"
struct edgetpu_shared_fw_buffer;
/*
* name for this firmware in null terminated string, the same as which loaded by
* linux request_firmware API
*/
const char *
edgetpu_shared_fw_buffer_name(const struct edgetpu_shared_fw_buffer *buffer);
/* host address for this firmware */
void *
edgetpu_shared_fw_buffer_vaddr(const struct edgetpu_shared_fw_buffer *buffer);
/* size in bytes for this firmware */
size_t
edgetpu_shared_fw_buffer_size(const struct edgetpu_shared_fw_buffer *buffer);
struct edgetpu_shared_fw_init_data {
/* firmware size alignment in bytes */
size_t size_align;
};
/* Initializes structures for shared firmware management. */
void
edgetpu_shared_fw_init(const struct edgetpu_shared_fw_init_data *init_data);
/* Finalizes structures for shared firmware management. */
void edgetpu_shared_fw_exit(void);
/*
* Load reference counted shared firmware from file system. Increase reference
* count by 1 if the firmware is already loaded before.
*
* Firmware loaded by this function should be released by
* edgetpu_shared_fw_put().
*
* @name: firmware path to be loaded
* @etdev: requesting edgetpu_dev, if any, for logging
*/
struct edgetpu_shared_fw_buffer *edgetpu_shared_fw_load(
const char *name, struct edgetpu_dev *etdev);
/*
* Increase the reference count of the buffer by 1.
*
* returns the buffer, behave the same as other *_get/put() functions
*/
struct edgetpu_shared_fw_buffer *
edgetpu_shared_fw_get(struct edgetpu_shared_fw_buffer *buffer);
/*
* Find the shared firmware by name and increase the reference count of the
* found buffer by 1.
*
* returns NULL on error or not found
*/
struct edgetpu_shared_fw_buffer *
edgetpu_shared_fw_get_by_name(const char *name);
/*
* Decrease the reference count by 1 and free the shared buffer if its
* reference count reaches 0.
*/
void edgetpu_shared_fw_put(struct edgetpu_shared_fw_buffer *buffer);
#endif /* __EDGETPU_SHARED_FW_H__ */
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