1 files changed, 93 insertions, 0 deletions
diff --git a/drivers/io/io_driver.h b/drivers/io/io_driver.h
new file mode 100644
index 0000000..82dbbf1
--- /dev/null
+++ b/drivers/io/io_driver.h
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __IO_DRIVER_H__
+#define __IO_DRIVER_H__
+
+#include "platform.h"   /* For MAX_IO_DEVICES */
+
+
+/* Generic IO entity structure,representing an accessible IO construct on the
+ * device, such as a file */
+struct io_entity {
+	io_dev_handle dev_handle;
+	uintptr_t info;
+};
+
+
+/* Device info structure, providing device-specific functions and a means of
+ * adding driver-specific state */
+struct io_dev_info {
+	struct io_dev_funcs *funcs;
+	uintptr_t info;
+};
+
+
+/* Structure used to create a connection to a type of device */
+struct io_dev_connector {
+	/* dev_open opens a connection to a particular device driver */
+	int (*dev_open)(void *spec, struct io_dev_info **dev_info);
+};
+
+
+/* Structure to hold device driver function pointers */
+struct io_dev_funcs {
+	io_type (*type)(void);
+	int (*open)(struct io_dev_info *dev_info, const void *spec,
+			struct io_entity *entity);
+	int (*seek)(struct io_entity *entity, int mode, ssize_t offset);
+	int (*size)(struct io_entity *entity, size_t *length);
+	int (*read)(struct io_entity *entity, void *buffer, size_t length,
+			size_t *length_read);
+	int (*write)(struct io_entity *entity, const void *buffer,
+			size_t length, size_t *length_written);
+	int (*close)(struct io_entity *entity);
+	int (*dev_init)(struct io_dev_info *dev_info, const void *init_params);
+	int (*dev_close)(struct io_dev_info *dev_info);
+};
+
+
+/* IO platform data - used to track devices registered for a specific
+ * platform */
+struct io_plat_data {
+	struct io_dev_info *devices[MAX_IO_DEVICES];
+	unsigned int dev_count;
+};
+
+
+/* Operations intended to be performed during platform initialisation */
+
+/* Initialise the IO layer */
+void io_init(struct io_plat_data *data);
+
+/* Register a device driver */
+int io_register_device(struct io_dev_info *dev_info);
+
+#endif  /* __IO_DRIVER_H__ */