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60 lines
1.7 KiB
60 lines
1.7 KiB
/*
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* Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef IO_DRIVER_H
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#define IO_DRIVER_H
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#include <stdint.h>
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#include <drivers/io/io_storage.h>
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/* Generic IO entity structure,representing an accessible IO construct on the
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* device, such as a file */
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typedef struct io_entity {
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struct io_dev_info *dev_handle;
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uintptr_t info;
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} io_entity_t;
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/* Device info structure, providing device-specific functions and a means of
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* adding driver-specific state */
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typedef struct io_dev_info {
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const struct io_dev_funcs *funcs;
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uintptr_t info;
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} io_dev_info_t;
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/* Structure used to create a connection to a type of device */
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typedef struct io_dev_connector {
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/* dev_open opens a connection to a particular device driver */
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int (*dev_open)(const uintptr_t dev_spec, io_dev_info_t **dev_info);
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} io_dev_connector_t;
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/* Structure to hold device driver function pointers */
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typedef struct io_dev_funcs {
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io_type_t (*type)(void);
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int (*open)(io_dev_info_t *dev_info, const uintptr_t spec,
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io_entity_t *entity);
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int (*seek)(io_entity_t *entity, int mode, signed long long offset);
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int (*size)(io_entity_t *entity, size_t *length);
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int (*read)(io_entity_t *entity, uintptr_t buffer, size_t length,
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size_t *length_read);
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int (*write)(io_entity_t *entity, const uintptr_t buffer,
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size_t length, size_t *length_written);
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int (*close)(io_entity_t *entity);
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int (*dev_init)(io_dev_info_t *dev_info, const uintptr_t init_params);
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int (*dev_close)(io_dev_info_t *dev_info);
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} io_dev_funcs_t;
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/* Operations intended to be performed during platform initialisation */
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/* Register an IO device */
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int io_register_device(const io_dev_info_t *dev_info);
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#endif /* IO_DRIVER_H */
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