1 files changed, 59 insertions, 0 deletions
diff --git a/include/drivers/io/io_driver.h b/include/drivers/io/io_driver.h
new file mode 100644
index 0000000..d8bb435
--- /dev/null
+++ b/include/drivers/io/io_driver.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef IO_DRIVER_H
+#define IO_DRIVER_H
+
+#include <stdint.h>
+
+#include <drivers/io/io_storage.h>
+
+/* Generic IO entity structure,representing an accessible IO construct on the
+ * device, such as a file */
+typedef struct io_entity {
+	struct io_dev_info *dev_handle;
+	uintptr_t info;
+} io_entity_t;
+
+
+/* Device info structure, providing device-specific functions and a means of
+ * adding driver-specific state */
+typedef struct io_dev_info {
+	const struct io_dev_funcs *funcs;
+	uintptr_t info;
+} io_dev_info_t;
+
+
+/* Structure used to create a connection to a type of device */
+typedef struct io_dev_connector {
+	/* dev_open opens a connection to a particular device driver */
+	int (*dev_open)(const uintptr_t dev_spec, io_dev_info_t **dev_info);
+} io_dev_connector_t;
+
+
+/* Structure to hold device driver function pointers */
+typedef struct io_dev_funcs {
+	io_type_t (*type)(void);
+	int (*open)(io_dev_info_t *dev_info, const uintptr_t spec,
+			io_entity_t *entity);
+	int (*seek)(io_entity_t *entity, int mode, signed long long offset);
+	int (*size)(io_entity_t *entity, size_t *length);
+	int (*read)(io_entity_t *entity, uintptr_t buffer, size_t length,
+			size_t *length_read);
+	int (*write)(io_entity_t *entity, const uintptr_t buffer,
+			size_t length, size_t *length_written);
+	int (*close)(io_entity_t *entity);
+	int (*dev_init)(io_dev_info_t *dev_info, const uintptr_t init_params);
+	int (*dev_close)(io_dev_info_t *dev_info);
+} io_dev_funcs_t;
+
+
+/* Operations intended to be performed during platform initialisation */
+
+/* Register an IO device */
+int io_register_device(const io_dev_info_t *dev_info);
+
+#endif /* IO_DRIVER_H */