1 /* 2 * Copyright (c) 2014, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #ifndef __IO_DRIVER_H__ 8 #define __IO_DRIVER_H__ 9 10 #include <io_storage.h> 11 #include <stdint.h> 12 13 14 /* Generic IO entity structure,representing an accessible IO construct on the 15 * device, such as a file */ 16 typedef struct io_entity { 17 struct io_dev_info *dev_handle; 18 uintptr_t info; 19 } io_entity_t; 20 21 22 /* Device info structure, providing device-specific functions and a means of 23 * adding driver-specific state */ 24 typedef struct io_dev_info { 25 const struct io_dev_funcs *funcs; 26 uintptr_t info; 27 } io_dev_info_t; 28 29 30 /* Structure used to create a connection to a type of device */ 31 typedef struct io_dev_connector { 32 /* dev_open opens a connection to a particular device driver */ 33 int (*dev_open)(const uintptr_t dev_spec, io_dev_info_t **dev_info); 34 } io_dev_connector_t; 35 36 37 /* Structure to hold device driver function pointers */ 38 typedef struct io_dev_funcs { 39 io_type_t (*type)(void); 40 int (*open)(io_dev_info_t *dev_info, const uintptr_t spec, 41 io_entity_t *entity); 42 int (*seek)(io_entity_t *entity, int mode, ssize_t offset); 43 int (*size)(io_entity_t *entity, size_t *length); 44 int (*read)(io_entity_t *entity, uintptr_t buffer, size_t length, 45 size_t *length_read); 46 int (*write)(io_entity_t *entity, const uintptr_t buffer, 47 size_t length, size_t *length_written); 48 int (*close)(io_entity_t *entity); 49 int (*dev_init)(io_dev_info_t *dev_info, const uintptr_t init_params); 50 int (*dev_close)(io_dev_info_t *dev_info); 51 } io_dev_funcs_t; 52 53 54 /* Operations intended to be performed during platform initialisation */ 55 56 /* Register an IO device */ 57 int io_register_device(const io_dev_info_t *dev_info); 58 59 #endif /* __IO_DRIVER_H__ */ 60